blob: 3261478bfc32dd31454da6c91de5db89a44beb6a [file] [log] [blame]
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001/*
Mingming Cao617ba132006-10-11 01:20:53 -07002 * linux/fs/ext4/super.c
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
Theodore Ts'oc5ca7c72009-04-27 22:48:48 -040023#include <linux/vmalloc.h>
Dave Kleikampac27a0e2006-10-11 01:20:50 -070024#include <linux/slab.h>
25#include <linux/init.h>
26#include <linux/blkdev.h>
Tejun Heo66114ca2015-05-22 17:13:32 -040027#include <linux/backing-dev.h>
Dave Kleikampac27a0e2006-10-11 01:20:50 -070028#include <linux/parser.h>
Dave Kleikampac27a0e2006-10-11 01:20:50 -070029#include <linux/buffer_head.h>
Christoph Hellwiga5694252007-07-17 04:04:28 -070030#include <linux/exportfs.h>
Dave Kleikampac27a0e2006-10-11 01:20:50 -070031#include <linux/vfs.h>
32#include <linux/random.h>
33#include <linux/mount.h>
34#include <linux/namei.h>
35#include <linux/quotaops.h>
36#include <linux/seq_file.h>
Theodore Ts'o3197ebd2009-03-31 09:10:09 -040037#include <linux/ctype.h>
Vignesh Babu13305932007-07-18 09:11:02 -040038#include <linux/log2.h>
Andreas Dilger717d50e2007-10-16 18:38:25 -040039#include <linux/crc16.h>
Dan Magenheimer7abc52c2011-05-26 10:02:03 -060040#include <linux/cleancache.h>
Dave Kleikampac27a0e2006-10-11 01:20:50 -070041#include <asm/uaccess.h>
42
Lukas Czernerbfff6872010-10-27 21:30:05 -040043#include <linux/kthread.h>
44#include <linux/freezer.h>
45
Christoph Hellwig3dcf5452008-04-29 18:13:32 -040046#include "ext4.h"
Theodore Ts'o4a092d72012-11-28 13:03:30 -050047#include "ext4_extents.h" /* Needed for trace points definition */
Christoph Hellwig3dcf5452008-04-29 18:13:32 -040048#include "ext4_jbd2.h"
Dave Kleikampac27a0e2006-10-11 01:20:50 -070049#include "xattr.h"
50#include "acl.h"
Theodore Ts'o3661d282009-09-14 22:59:50 -040051#include "mballoc.h"
Dave Kleikampac27a0e2006-10-11 01:20:50 -070052
Theodore Ts'o9bffad12009-06-17 11:48:11 -040053#define CREATE_TRACE_POINTS
54#include <trace/events/ext4.h>
55
Lukas Czerner0b75a842011-02-23 12:22:49 -050056static struct ext4_lazy_init *ext4_li_info;
57static struct mutex ext4_li_mtx;
Theodore Ts'oe294a532015-08-15 14:59:44 -040058static struct ratelimit_state ext4_mount_msg_ratelimit;
Theodore Ts'o9f6200b2008-09-23 09:18:24 -040059
Mingming Cao617ba132006-10-11 01:20:53 -070060static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
Dave Kleikampac27a0e2006-10-11 01:20:50 -070061 unsigned long journal_devnum);
Theodore Ts'o2adf6da2012-03-03 23:20:50 -050062static int ext4_show_options(struct seq_file *seq, struct dentry *root);
Theodore Ts'oe2d67052009-05-01 00:33:44 -040063static int ext4_commit_super(struct super_block *sb, int sync);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -040064static void ext4_mark_recovery_complete(struct super_block *sb,
65 struct ext4_super_block *es);
66static void ext4_clear_journal_err(struct super_block *sb,
67 struct ext4_super_block *es);
Mingming Cao617ba132006-10-11 01:20:53 -070068static int ext4_sync_fs(struct super_block *sb, int wait);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -040069static int ext4_remount(struct super_block *sb, int *flags, char *data);
70static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
Takashi Satoc4be0c12009-01-09 16:40:58 -080071static int ext4_unfreeze(struct super_block *sb);
Takashi Satoc4be0c12009-01-09 16:40:58 -080072static int ext4_freeze(struct super_block *sb);
Al Viro152a0832010-07-25 00:46:55 +040073static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
74 const char *dev_name, void *data);
Theodore Ts'o2035e772011-04-18 17:29:14 -040075static inline int ext2_feature_set_ok(struct super_block *sb);
76static inline int ext3_feature_set_ok(struct super_block *sb);
Amir Goldsteind39195c2011-02-28 00:53:45 -050077static int ext4_feature_set_ok(struct super_block *sb, int readonly);
Lukas Czernerbfff6872010-10-27 21:30:05 -040078static void ext4_destroy_lazyinit_thread(void);
79static void ext4_unregister_li_request(struct super_block *sb);
Eric Sandeen8f1f7452011-02-03 14:33:15 -050080static void ext4_clear_request_list(void);
Eric Whitneyc6cb7e72016-09-30 02:05:09 -040081static struct inode *ext4_get_journal_inode(struct super_block *sb,
82 unsigned int journal_inum);
Dave Kleikampac27a0e2006-10-11 01:20:50 -070083
Jan Karae74031f2015-12-07 14:35:49 -050084/*
85 * Lock ordering
86 *
87 * Note the difference between i_mmap_sem (EXT4_I(inode)->i_mmap_sem) and
88 * i_mmap_rwsem (inode->i_mmap_rwsem)!
89 *
90 * page fault path:
91 * mmap_sem -> sb_start_pagefault -> i_mmap_sem (r) -> transaction start ->
92 * page lock -> i_data_sem (rw)
93 *
94 * buffered write path:
95 * sb_start_write -> i_mutex -> mmap_sem
96 * sb_start_write -> i_mutex -> transaction start -> page lock ->
97 * i_data_sem (rw)
98 *
99 * truncate:
100 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) ->
101 * i_mmap_rwsem (w) -> page lock
102 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) ->
103 * transaction start -> i_data_sem (rw)
104 *
105 * direct IO:
106 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) -> mmap_sem
107 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) ->
108 * transaction start -> i_data_sem (rw)
109 *
110 * writepages:
111 * transaction start -> page lock(s) -> i_data_sem (rw)
112 */
113
Jan Karac290ea02015-06-18 16:52:29 +0200114#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
Theodore Ts'o2035e772011-04-18 17:29:14 -0400115static struct file_system_type ext2_fs_type = {
116 .owner = THIS_MODULE,
117 .name = "ext2",
118 .mount = ext4_mount,
119 .kill_sb = kill_block_super,
120 .fs_flags = FS_REQUIRES_DEV,
121};
Eric W. Biederman7f78e032013-03-02 19:39:14 -0800122MODULE_ALIAS_FS("ext2");
Eric W. Biedermanfa7614dd2013-03-12 18:27:41 -0700123MODULE_ALIAS("ext2");
Theodore Ts'o2035e772011-04-18 17:29:14 -0400124#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
125#else
126#define IS_EXT2_SB(sb) (0)
127#endif
128
129
Jan Karaba69f9a2010-03-24 20:18:37 -0400130static struct file_system_type ext3_fs_type = {
131 .owner = THIS_MODULE,
132 .name = "ext3",
Al Viro152a0832010-07-25 00:46:55 +0400133 .mount = ext4_mount,
Jan Karaba69f9a2010-03-24 20:18:37 -0400134 .kill_sb = kill_block_super,
135 .fs_flags = FS_REQUIRES_DEV,
136};
Eric W. Biederman7f78e032013-03-02 19:39:14 -0800137MODULE_ALIAS_FS("ext3");
Eric W. Biedermanfa7614dd2013-03-12 18:27:41 -0700138MODULE_ALIAS("ext3");
Jan Karaba69f9a2010-03-24 20:18:37 -0400139#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700140
Darrick J. Wongd25425f2012-04-29 18:25:10 -0400141static int ext4_verify_csum_type(struct super_block *sb,
142 struct ext4_super_block *es)
143{
Darrick J. Wonge2b911c2015-10-17 16:18:43 -0400144 if (!ext4_has_feature_metadata_csum(sb))
Darrick J. Wongd25425f2012-04-29 18:25:10 -0400145 return 1;
146
147 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
148}
149
Darrick J. Wonga9c473172012-04-29 18:29:10 -0400150static __le32 ext4_superblock_csum(struct super_block *sb,
151 struct ext4_super_block *es)
152{
153 struct ext4_sb_info *sbi = EXT4_SB(sb);
154 int offset = offsetof(struct ext4_super_block, s_checksum);
155 __u32 csum;
156
157 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
158
159 return cpu_to_le32(csum);
160}
161
Stephen Hemmingerc1978552014-05-12 10:50:23 -0400162static int ext4_superblock_csum_verify(struct super_block *sb,
163 struct ext4_super_block *es)
Darrick J. Wonga9c473172012-04-29 18:29:10 -0400164{
Dmitry Monakhov9aa5d322014-10-13 03:36:16 -0400165 if (!ext4_has_metadata_csum(sb))
Darrick J. Wonga9c473172012-04-29 18:29:10 -0400166 return 1;
167
168 return es->s_checksum == ext4_superblock_csum(sb, es);
169}
170
Theodore Ts'o06db49e2012-10-10 01:06:58 -0400171void ext4_superblock_csum_set(struct super_block *sb)
Darrick J. Wonga9c473172012-04-29 18:29:10 -0400172{
Theodore Ts'o06db49e2012-10-10 01:06:58 -0400173 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
174
Dmitry Monakhov9aa5d322014-10-13 03:36:16 -0400175 if (!ext4_has_metadata_csum(sb))
Darrick J. Wonga9c473172012-04-29 18:29:10 -0400176 return;
177
178 es->s_checksum = ext4_superblock_csum(sb, es);
179}
180
Theodore Ts'o9933fc02011-08-01 08:45:02 -0400181void *ext4_kvmalloc(size_t size, gfp_t flags)
182{
183 void *ret;
184
Joe Perches8be04b92013-06-19 12:15:53 -0700185 ret = kmalloc(size, flags | __GFP_NOWARN);
Theodore Ts'o9933fc02011-08-01 08:45:02 -0400186 if (!ret)
187 ret = __vmalloc(size, flags, PAGE_KERNEL);
188 return ret;
189}
190
191void *ext4_kvzalloc(size_t size, gfp_t flags)
192{
193 void *ret;
194
Joe Perches8be04b92013-06-19 12:15:53 -0700195 ret = kzalloc(size, flags | __GFP_NOWARN);
Theodore Ts'o9933fc02011-08-01 08:45:02 -0400196 if (!ret)
197 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
198 return ret;
199}
200
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700201ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
202 struct ext4_group_desc *bg)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700203{
Aneesh Kumar K.V3a145892007-10-16 18:38:25 -0400204 return le32_to_cpu(bg->bg_block_bitmap_lo) |
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700205 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
Andreas Dilger0b8e58a2009-06-03 17:59:28 -0400206 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700207}
208
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700209ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
210 struct ext4_group_desc *bg)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700211{
Aneesh Kumar K.V5272f832007-10-16 18:38:25 -0400212 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700213 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
Andreas Dilger0b8e58a2009-06-03 17:59:28 -0400214 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700215}
216
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700217ext4_fsblk_t ext4_inode_table(struct super_block *sb,
218 struct ext4_group_desc *bg)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700219{
Aneesh Kumar K.V5272f832007-10-16 18:38:25 -0400220 return le32_to_cpu(bg->bg_inode_table_lo) |
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700221 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
Andreas Dilger0b8e58a2009-06-03 17:59:28 -0400222 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700223}
224
Theodore Ts'o021b65b2011-09-09 19:08:51 -0400225__u32 ext4_free_group_clusters(struct super_block *sb,
226 struct ext4_group_desc *bg)
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500227{
228 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
229 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
Andreas Dilger0b8e58a2009-06-03 17:59:28 -0400230 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500231}
232
233__u32 ext4_free_inodes_count(struct super_block *sb,
234 struct ext4_group_desc *bg)
235{
236 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
237 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
Andreas Dilger0b8e58a2009-06-03 17:59:28 -0400238 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500239}
240
241__u32 ext4_used_dirs_count(struct super_block *sb,
242 struct ext4_group_desc *bg)
243{
244 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
245 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
Andreas Dilger0b8e58a2009-06-03 17:59:28 -0400246 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500247}
248
249__u32 ext4_itable_unused_count(struct super_block *sb,
250 struct ext4_group_desc *bg)
251{
252 return le16_to_cpu(bg->bg_itable_unused_lo) |
253 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
Andreas Dilger0b8e58a2009-06-03 17:59:28 -0400254 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500255}
256
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700257void ext4_block_bitmap_set(struct super_block *sb,
258 struct ext4_group_desc *bg, ext4_fsblk_t blk)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700259{
Aneesh Kumar K.V3a145892007-10-16 18:38:25 -0400260 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700261 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
262 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700263}
264
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700265void ext4_inode_bitmap_set(struct super_block *sb,
266 struct ext4_group_desc *bg, ext4_fsblk_t blk)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700267{
Aneesh Kumar K.V5272f832007-10-16 18:38:25 -0400268 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700269 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
270 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700271}
272
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700273void ext4_inode_table_set(struct super_block *sb,
274 struct ext4_group_desc *bg, ext4_fsblk_t blk)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700275{
Aneesh Kumar K.V5272f832007-10-16 18:38:25 -0400276 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700277 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
278 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700279}
280
Theodore Ts'o021b65b2011-09-09 19:08:51 -0400281void ext4_free_group_clusters_set(struct super_block *sb,
282 struct ext4_group_desc *bg, __u32 count)
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500283{
284 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
285 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
286 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
287}
288
289void ext4_free_inodes_set(struct super_block *sb,
290 struct ext4_group_desc *bg, __u32 count)
291{
292 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
293 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
294 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
295}
296
297void ext4_used_dirs_set(struct super_block *sb,
298 struct ext4_group_desc *bg, __u32 count)
299{
300 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
301 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
302 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
303}
304
305void ext4_itable_unused_set(struct super_block *sb,
306 struct ext4_group_desc *bg, __u32 count)
307{
308 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
309 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
310 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
311}
312
Curt Wohlgemuthd3d1faf2009-09-29 11:01:03 -0400313
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400314static void __save_error_info(struct super_block *sb, const char *func,
315 unsigned int line)
316{
317 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
318
319 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
Theodore Ts'o1b466172015-05-14 18:37:30 -0400320 if (bdev_read_only(sb->s_bdev))
321 return;
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400322 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
323 es->s_last_error_time = cpu_to_le32(get_seconds());
324 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
325 es->s_last_error_line = cpu_to_le32(line);
326 if (!es->s_first_error_time) {
327 es->s_first_error_time = es->s_last_error_time;
328 strncpy(es->s_first_error_func, func,
329 sizeof(es->s_first_error_func));
330 es->s_first_error_line = cpu_to_le32(line);
331 es->s_first_error_ino = es->s_last_error_ino;
332 es->s_first_error_block = es->s_last_error_block;
333 }
Theodore Ts'o66e61a92010-07-27 11:56:04 -0400334 /*
335 * Start the daily error reporting function if it hasn't been
336 * started already
337 */
338 if (!es->s_error_count)
339 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
Wei Yongjunba39ebb2012-09-27 09:37:53 -0400340 le32_add_cpu(&es->s_error_count, 1);
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400341}
342
343static void save_error_info(struct super_block *sb, const char *func,
344 unsigned int line)
345{
346 __save_error_info(sb, func, line);
347 ext4_commit_super(sb, 1);
348}
349
Theodore Ts'obdfe0cbd2015-08-16 10:03:57 -0400350/*
351 * The del_gendisk() function uninitializes the disk-specific data
352 * structures, including the bdi structure, without telling anyone
353 * else. Once this happens, any attempt to call mark_buffer_dirty()
354 * (for example, by ext4_commit_super), will cause a kernel OOPS.
355 * This is a kludge to prevent these oops until we can put in a proper
356 * hook in del_gendisk() to inform the VFS and file system layers.
357 */
358static int block_device_ejected(struct super_block *sb)
359{
360 struct inode *bd_inode = sb->s_bdev->bd_inode;
361 struct backing_dev_info *bdi = inode_to_bdi(bd_inode);
362
363 return bdi->dev == NULL;
364}
365
Bobi Jam18aadd42012-02-20 17:53:02 -0500366static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
367{
368 struct super_block *sb = journal->j_private;
369 struct ext4_sb_info *sbi = EXT4_SB(sb);
370 int error = is_journal_aborted(journal);
Dmitry Monakhov5d3ee202013-04-03 22:08:52 -0400371 struct ext4_journal_cb_entry *jce;
Bobi Jam18aadd42012-02-20 17:53:02 -0500372
Dmitry Monakhov5d3ee202013-04-03 22:08:52 -0400373 BUG_ON(txn->t_state == T_FINISHED);
Bobi Jam18aadd42012-02-20 17:53:02 -0500374 spin_lock(&sbi->s_md_lock);
Dmitry Monakhov5d3ee202013-04-03 22:08:52 -0400375 while (!list_empty(&txn->t_private_list)) {
376 jce = list_entry(txn->t_private_list.next,
377 struct ext4_journal_cb_entry, jce_list);
Bobi Jam18aadd42012-02-20 17:53:02 -0500378 list_del_init(&jce->jce_list);
379 spin_unlock(&sbi->s_md_lock);
380 jce->jce_func(sb, jce, error);
381 spin_lock(&sbi->s_md_lock);
382 }
383 spin_unlock(&sbi->s_md_lock);
384}
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400385
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700386/* Deal with the reporting of failure conditions on a filesystem such as
387 * inconsistencies detected or read IO failures.
388 *
389 * On ext2, we can store the error state of the filesystem in the
Mingming Cao617ba132006-10-11 01:20:53 -0700390 * superblock. That is not possible on ext4, because we may have other
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700391 * write ordering constraints on the superblock which prevent us from
392 * writing it out straight away; and given that the journal is about to
393 * be aborted, we can't rely on the current, or future, transactions to
394 * write out the superblock safely.
395 *
Mingming Caodab291a2006-10-11 01:21:01 -0700396 * We'll just use the jbd2_journal_abort() error code to record an error in
Thadeu Lima de Souza Cascardod6b198b2010-01-17 19:10:07 -0200397 * the journal instead. On recovery, the journal will complain about
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700398 * that error until we've noted it down and cleared it.
399 */
400
Mingming Cao617ba132006-10-11 01:20:53 -0700401static void ext4_handle_error(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700402{
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700403 if (sb->s_flags & MS_RDONLY)
404 return;
405
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400406 if (!test_opt(sb, ERRORS_CONT)) {
Mingming Cao617ba132006-10-11 01:20:53 -0700407 journal_t *journal = EXT4_SB(sb)->s_journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700408
Theodore Ts'o4ab2f152009-06-13 10:09:36 -0400409 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700410 if (journal)
Mingming Caodab291a2006-10-11 01:21:01 -0700411 jbd2_journal_abort(journal, -EIO);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700412 }
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400413 if (test_opt(sb, ERRORS_RO)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -0400414 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
Dmitry Monakhov4418e1412013-06-12 22:38:04 -0400415 /*
416 * Make sure updated value of ->s_mount_flags will be visible
417 * before ->s_flags update
418 */
419 smp_wmb();
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700420 sb->s_flags |= MS_RDONLY;
421 }
Daeho Jeong4327ba52015-10-18 17:02:56 -0400422 if (test_opt(sb, ERRORS_PANIC)) {
423 if (EXT4_SB(sb)->s_journal &&
424 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
425 return;
Mingming Cao617ba132006-10-11 01:20:53 -0700426 panic("EXT4-fs (device %s): panic forced after error\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700427 sb->s_id);
Daeho Jeong4327ba52015-10-18 17:02:56 -0400428 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700429}
430
Theodore Ts'oefbed4d2013-10-17 21:11:01 -0400431#define ext4_error_ratelimit(sb) \
432 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
433 "EXT4-fs error")
434
Eric Sandeen12062dd2010-02-15 14:19:27 -0500435void __ext4_error(struct super_block *sb, const char *function,
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400436 unsigned int line, const char *fmt, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700437{
Joe Perches0ff2ea72010-12-19 22:43:19 -0500438 struct va_format vaf;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700439 va_list args;
440
Theodore Ts'oefbed4d2013-10-17 21:11:01 -0400441 if (ext4_error_ratelimit(sb)) {
442 va_start(args, fmt);
443 vaf.fmt = fmt;
444 vaf.va = &args;
445 printk(KERN_CRIT
446 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
447 sb->s_id, function, line, current->comm, &vaf);
448 va_end(args);
449 }
Theodore Ts'of3fc02102012-05-30 23:00:16 -0400450 save_error_info(sb, function, line);
Mingming Cao617ba132006-10-11 01:20:53 -0700451 ext4_handle_error(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700452}
453
Joe Perchese7c96e82013-07-01 08:12:37 -0400454void __ext4_error_inode(struct inode *inode, const char *function,
455 unsigned int line, ext4_fsblk_t block,
456 const char *fmt, ...)
Frank Mayhar273df552010-03-02 11:46:09 -0500457{
458 va_list args;
Theodore Ts'of7c21172011-01-10 12:10:55 -0500459 struct va_format vaf;
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400460 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
Frank Mayhar273df552010-03-02 11:46:09 -0500461
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400462 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
463 es->s_last_error_block = cpu_to_le64(block);
Theodore Ts'oefbed4d2013-10-17 21:11:01 -0400464 if (ext4_error_ratelimit(inode->i_sb)) {
465 va_start(args, fmt);
466 vaf.fmt = fmt;
467 vaf.va = &args;
468 if (block)
469 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
470 "inode #%lu: block %llu: comm %s: %pV\n",
471 inode->i_sb->s_id, function, line, inode->i_ino,
472 block, current->comm, &vaf);
473 else
474 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
475 "inode #%lu: comm %s: %pV\n",
476 inode->i_sb->s_id, function, line, inode->i_ino,
477 current->comm, &vaf);
478 va_end(args);
479 }
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400480 save_error_info(inode->i_sb, function, line);
Frank Mayhar273df552010-03-02 11:46:09 -0500481 ext4_handle_error(inode->i_sb);
482}
483
Joe Perchese7c96e82013-07-01 08:12:37 -0400484void __ext4_error_file(struct file *file, const char *function,
485 unsigned int line, ext4_fsblk_t block,
486 const char *fmt, ...)
Frank Mayhar273df552010-03-02 11:46:09 -0500487{
488 va_list args;
Theodore Ts'of7c21172011-01-10 12:10:55 -0500489 struct va_format vaf;
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400490 struct ext4_super_block *es;
Al Viro496ad9a2013-01-23 17:07:38 -0500491 struct inode *inode = file_inode(file);
Frank Mayhar273df552010-03-02 11:46:09 -0500492 char pathname[80], *path;
493
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400494 es = EXT4_SB(inode->i_sb)->s_es;
495 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
Theodore Ts'oefbed4d2013-10-17 21:11:01 -0400496 if (ext4_error_ratelimit(inode->i_sb)) {
Miklos Szeredi9bf39ab2015-06-19 10:29:13 +0200497 path = file_path(file, pathname, sizeof(pathname));
Theodore Ts'oefbed4d2013-10-17 21:11:01 -0400498 if (IS_ERR(path))
499 path = "(unknown)";
500 va_start(args, fmt);
501 vaf.fmt = fmt;
502 vaf.va = &args;
503 if (block)
504 printk(KERN_CRIT
505 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
506 "block %llu: comm %s: path %s: %pV\n",
507 inode->i_sb->s_id, function, line, inode->i_ino,
508 block, current->comm, path, &vaf);
509 else
510 printk(KERN_CRIT
511 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
512 "comm %s: path %s: %pV\n",
513 inode->i_sb->s_id, function, line, inode->i_ino,
514 current->comm, path, &vaf);
515 va_end(args);
516 }
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400517 save_error_info(inode->i_sb, function, line);
Frank Mayhar273df552010-03-02 11:46:09 -0500518 ext4_handle_error(inode->i_sb);
519}
520
Theodore Ts'o722887d2013-02-08 13:00:31 -0500521const char *ext4_decode_error(struct super_block *sb, int errno,
522 char nbuf[16])
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700523{
524 char *errstr = NULL;
525
526 switch (errno) {
Darrick J. Wong6a797d22015-10-17 16:16:04 -0400527 case -EFSCORRUPTED:
528 errstr = "Corrupt filesystem";
529 break;
530 case -EFSBADCRC:
531 errstr = "Filesystem failed CRC";
532 break;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700533 case -EIO:
534 errstr = "IO failure";
535 break;
536 case -ENOMEM:
537 errstr = "Out of memory";
538 break;
539 case -EROFS:
Theodore Ts'o78f1ddb2009-07-27 23:09:47 -0400540 if (!sb || (EXT4_SB(sb)->s_journal &&
541 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700542 errstr = "Journal has aborted";
543 else
544 errstr = "Readonly filesystem";
545 break;
546 default:
547 /* If the caller passed in an extra buffer for unknown
548 * errors, textualise them now. Else we just return
549 * NULL. */
550 if (nbuf) {
551 /* Check for truncated error codes... */
552 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
553 errstr = nbuf;
554 }
555 break;
556 }
557
558 return errstr;
559}
560
Mingming Cao617ba132006-10-11 01:20:53 -0700561/* __ext4_std_error decodes expected errors from journaling functions
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700562 * automatically and invokes the appropriate error response. */
563
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400564void __ext4_std_error(struct super_block *sb, const char *function,
565 unsigned int line, int errno)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700566{
567 char nbuf[16];
568 const char *errstr;
569
570 /* Special case: if the error is EROFS, and we're not already
571 * inside a transaction, then there's really no point in logging
572 * an error. */
573 if (errno == -EROFS && journal_current_handle() == NULL &&
574 (sb->s_flags & MS_RDONLY))
575 return;
576
Theodore Ts'oefbed4d2013-10-17 21:11:01 -0400577 if (ext4_error_ratelimit(sb)) {
578 errstr = ext4_decode_error(sb, errno, nbuf);
579 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
580 sb->s_id, function, line, errstr);
581 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700582
Theodore Ts'oefbed4d2013-10-17 21:11:01 -0400583 save_error_info(sb, function, line);
Mingming Cao617ba132006-10-11 01:20:53 -0700584 ext4_handle_error(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700585}
586
587/*
Mingming Cao617ba132006-10-11 01:20:53 -0700588 * ext4_abort is a much stronger failure handler than ext4_error. The
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700589 * abort function may be used to deal with unrecoverable failures such
590 * as journal IO errors or ENOMEM at a critical moment in log management.
591 *
592 * We unconditionally force the filesystem into an ABORT|READONLY state,
593 * unless the error response on the fs has been set to panic in which
594 * case we take the easy way out and panic immediately.
595 */
596
Theodore Ts'oc67d8592010-06-29 11:07:07 -0400597void __ext4_abort(struct super_block *sb, const char *function,
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400598 unsigned int line, const char *fmt, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700599{
Joe Perches651e1c32016-10-12 23:12:53 -0400600 struct va_format vaf;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700601 va_list args;
602
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400603 save_error_info(sb, function, line);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700604 va_start(args, fmt);
Joe Perches651e1c32016-10-12 23:12:53 -0400605 vaf.fmt = fmt;
606 vaf.va = &args;
607 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: %pV\n",
608 sb->s_id, function, line, &vaf);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700609 va_end(args);
610
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400611 if ((sb->s_flags & MS_RDONLY) == 0) {
612 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400613 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
Dmitry Monakhov4418e1412013-06-12 22:38:04 -0400614 /*
615 * Make sure updated value of ->s_mount_flags will be visible
616 * before ->s_flags update
617 */
618 smp_wmb();
619 sb->s_flags |= MS_RDONLY;
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400620 if (EXT4_SB(sb)->s_journal)
621 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
622 save_error_info(sb, function, line);
623 }
Daeho Jeong4327ba52015-10-18 17:02:56 -0400624 if (test_opt(sb, ERRORS_PANIC)) {
625 if (EXT4_SB(sb)->s_journal &&
626 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
627 return;
Mingming Cao617ba132006-10-11 01:20:53 -0700628 panic("EXT4-fs panic from previous error\n");
Daeho Jeong4327ba52015-10-18 17:02:56 -0400629 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700630}
631
Joe Perchese7c96e82013-07-01 08:12:37 -0400632void __ext4_msg(struct super_block *sb,
633 const char *prefix, const char *fmt, ...)
Eric Sandeenb31e1552009-06-04 17:36:36 -0400634{
Joe Perches0ff2ea72010-12-19 22:43:19 -0500635 struct va_format vaf;
Eric Sandeenb31e1552009-06-04 17:36:36 -0400636 va_list args;
637
Theodore Ts'oefbed4d2013-10-17 21:11:01 -0400638 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
639 return;
640
Eric Sandeenb31e1552009-06-04 17:36:36 -0400641 va_start(args, fmt);
Joe Perches0ff2ea72010-12-19 22:43:19 -0500642 vaf.fmt = fmt;
643 vaf.va = &args;
644 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
Eric Sandeenb31e1552009-06-04 17:36:36 -0400645 va_end(args);
646}
647
Andreas Dilgerb03a2f72015-06-15 14:50:26 -0400648#define ext4_warning_ratelimit(sb) \
649 ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), \
650 "EXT4-fs warning")
651
Eric Sandeen12062dd2010-02-15 14:19:27 -0500652void __ext4_warning(struct super_block *sb, const char *function,
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400653 unsigned int line, const char *fmt, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700654{
Joe Perches0ff2ea72010-12-19 22:43:19 -0500655 struct va_format vaf;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700656 va_list args;
657
Andreas Dilgerb03a2f72015-06-15 14:50:26 -0400658 if (!ext4_warning_ratelimit(sb))
Theodore Ts'oefbed4d2013-10-17 21:11:01 -0400659 return;
660
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700661 va_start(args, fmt);
Joe Perches0ff2ea72010-12-19 22:43:19 -0500662 vaf.fmt = fmt;
663 vaf.va = &args;
664 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
665 sb->s_id, function, line, &vaf);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700666 va_end(args);
667}
668
Andreas Dilgerb03a2f72015-06-15 14:50:26 -0400669void __ext4_warning_inode(const struct inode *inode, const char *function,
670 unsigned int line, const char *fmt, ...)
671{
672 struct va_format vaf;
673 va_list args;
674
675 if (!ext4_warning_ratelimit(inode->i_sb))
676 return;
677
678 va_start(args, fmt);
679 vaf.fmt = fmt;
680 vaf.va = &args;
681 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: "
682 "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id,
683 function, line, inode->i_ino, current->comm, &vaf);
684 va_end(args);
685}
686
Theodore Ts'oe29136f2010-06-29 12:54:28 -0400687void __ext4_grp_locked_error(const char *function, unsigned int line,
688 struct super_block *sb, ext4_group_t grp,
689 unsigned long ino, ext4_fsblk_t block,
690 const char *fmt, ...)
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -0500691__releases(bitlock)
692__acquires(bitlock)
693{
Joe Perches0ff2ea72010-12-19 22:43:19 -0500694 struct va_format vaf;
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -0500695 va_list args;
696 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
697
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400698 es->s_last_error_ino = cpu_to_le32(ino);
699 es->s_last_error_block = cpu_to_le64(block);
700 __save_error_info(sb, function, line);
Joe Perches0ff2ea72010-12-19 22:43:19 -0500701
Theodore Ts'oefbed4d2013-10-17 21:11:01 -0400702 if (ext4_error_ratelimit(sb)) {
703 va_start(args, fmt);
704 vaf.fmt = fmt;
705 vaf.va = &args;
706 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
707 sb->s_id, function, line, grp);
708 if (ino)
709 printk(KERN_CONT "inode %lu: ", ino);
710 if (block)
711 printk(KERN_CONT "block %llu:",
712 (unsigned long long) block);
713 printk(KERN_CONT "%pV\n", &vaf);
714 va_end(args);
715 }
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -0500716
717 if (test_opt(sb, ERRORS_CONT)) {
Theodore Ts'oe2d67052009-05-01 00:33:44 -0400718 ext4_commit_super(sb, 0);
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -0500719 return;
720 }
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400721
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -0500722 ext4_unlock_group(sb, grp);
Zhouyi Zhou4a36f432018-01-10 00:34:19 -0500723 ext4_commit_super(sb, 1);
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -0500724 ext4_handle_error(sb);
725 /*
726 * We only get here in the ERRORS_RO case; relocking the group
727 * may be dangerous, but nothing bad will happen since the
728 * filesystem will have already been marked read/only and the
729 * journal has been aborted. We return 1 as a hint to callers
730 * who might what to use the return value from
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300731 * ext4_grp_locked_error() to distinguish between the
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -0500732 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
733 * aggressively from the ext4 function in question, with a
734 * more appropriate error code.
735 */
736 ext4_lock_group(sb, grp);
737 return;
738}
739
Mingming Cao617ba132006-10-11 01:20:53 -0700740void ext4_update_dynamic_rev(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700741{
Mingming Cao617ba132006-10-11 01:20:53 -0700742 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700743
Mingming Cao617ba132006-10-11 01:20:53 -0700744 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700745 return;
746
Eric Sandeen12062dd2010-02-15 14:19:27 -0500747 ext4_warning(sb,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700748 "updating to rev %d because of new feature flag, "
749 "running e2fsck is recommended",
Mingming Cao617ba132006-10-11 01:20:53 -0700750 EXT4_DYNAMIC_REV);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700751
Mingming Cao617ba132006-10-11 01:20:53 -0700752 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
753 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
754 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700755 /* leave es->s_feature_*compat flags alone */
756 /* es->s_uuid will be set by e2fsck if empty */
757
758 /*
759 * The rest of the superblock fields should be zero, and if not it
760 * means they are likely already in use, so leave them alone. We
761 * can leave it up to e2fsck to clean up any inconsistencies there.
762 */
763}
764
765/*
766 * Open the external journal device
767 */
Eric Sandeenb31e1552009-06-04 17:36:36 -0400768static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700769{
770 struct block_device *bdev;
771 char b[BDEVNAME_SIZE];
772
Tejun Heod4d77622010-11-13 11:55:18 +0100773 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700774 if (IS_ERR(bdev))
775 goto fail;
776 return bdev;
777
778fail:
Eric Sandeenb31e1552009-06-04 17:36:36 -0400779 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700780 __bdevname(dev, b), PTR_ERR(bdev));
781 return NULL;
782}
783
784/*
785 * Release the journal device
786 */
Al Viro4385bab2013-05-05 22:11:03 -0400787static void ext4_blkdev_put(struct block_device *bdev)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700788{
Al Viro4385bab2013-05-05 22:11:03 -0400789 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700790}
791
Al Viro4385bab2013-05-05 22:11:03 -0400792static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700793{
794 struct block_device *bdev;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700795 bdev = sbi->journal_bdev;
796 if (bdev) {
Al Viro4385bab2013-05-05 22:11:03 -0400797 ext4_blkdev_put(bdev);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700798 sbi->journal_bdev = NULL;
799 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700800}
801
802static inline struct inode *orphan_list_entry(struct list_head *l)
803{
Mingming Cao617ba132006-10-11 01:20:53 -0700804 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700805}
806
Mingming Cao617ba132006-10-11 01:20:53 -0700807static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700808{
809 struct list_head *l;
810
Eric Sandeenb31e1552009-06-04 17:36:36 -0400811 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
812 le32_to_cpu(sbi->s_es->s_last_orphan));
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700813
814 printk(KERN_ERR "sb_info orphan list:\n");
815 list_for_each(l, &sbi->s_orphan) {
816 struct inode *inode = orphan_list_entry(l);
817 printk(KERN_ERR " "
818 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
819 inode->i_sb->s_id, inode->i_ino, inode,
820 inode->i_mode, inode->i_nlink,
821 NEXT_ORPHAN(inode));
822 }
823}
824
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400825static void ext4_put_super(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700826{
Mingming Cao617ba132006-10-11 01:20:53 -0700827 struct ext4_sb_info *sbi = EXT4_SB(sb);
828 struct ext4_super_block *es = sbi->s_es;
Theodore Ts'o269bf7b2017-02-04 23:38:06 -0500829 int aborted = 0;
Hidehiro Kawaief2cabf2008-10-27 22:53:05 -0400830 int i, err;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700831
Lukas Czerner857ac882010-10-27 21:30:05 -0400832 ext4_unregister_li_request(sb);
Christoph Hellwige0ccfd92010-05-19 07:16:42 -0400833 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
834
Jan Kara2e8fa542013-06-04 14:21:02 -0400835 flush_workqueue(sbi->rsv_conversion_wq);
Jan Kara2e8fa542013-06-04 14:21:02 -0400836 destroy_workqueue(sbi->rsv_conversion_wq);
Mingming Cao4c0425f2009-09-28 15:48:41 -0400837
Frank Mayhar03901312009-01-07 00:06:22 -0500838 if (sbi->s_journal) {
Theodore Ts'o269bf7b2017-02-04 23:38:06 -0500839 aborted = is_journal_aborted(sbi->s_journal);
Frank Mayhar03901312009-01-07 00:06:22 -0500840 err = jbd2_journal_destroy(sbi->s_journal);
841 sbi->s_journal = NULL;
Theodore Ts'o269bf7b2017-02-04 23:38:06 -0500842 if ((err < 0) && !aborted)
Theodore Ts'oc67d8592010-06-29 11:07:07 -0400843 ext4_abort(sb, "Couldn't clean up the journal");
Frank Mayhar03901312009-01-07 00:06:22 -0500844 }
Josef Bacikd4edac32009-12-08 21:48:58 -0500845
Theodore Ts'oebd173b2015-09-23 12:46:17 -0400846 ext4_unregister_sysfs(sb);
Zheng Liud3922a72013-07-01 08:12:37 -0400847 ext4_es_unregister_shrinker(sbi);
Al Viro9105bb12013-12-08 20:52:31 -0500848 del_timer_sync(&sbi->s_err_report);
Josef Bacikd4edac32009-12-08 21:48:58 -0500849 ext4_release_system_zone(sb);
850 ext4_mb_release(sb);
851 ext4_ext_release(sb);
Josef Bacikd4edac32009-12-08 21:48:58 -0500852
Theodore Ts'o269bf7b2017-02-04 23:38:06 -0500853 if (!(sb->s_flags & MS_RDONLY) && !aborted) {
Darrick J. Wonge2b911c2015-10-17 16:18:43 -0400854 ext4_clear_feature_journal_needs_recovery(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700855 es->s_state = cpu_to_le16(sbi->s_mount_state);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700856 }
Artem Bityutskiy58c58732012-07-22 20:33:31 -0400857 if (!(sb->s_flags & MS_RDONLY))
Artem Bityutskiya8e25a82012-03-21 22:29:15 -0400858 ext4_commit_super(sb, 1);
859
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700860 for (i = 0; i < sbi->s_gdb_count; i++)
861 brelse(sbi->s_group_desc[i]);
Al Virob93b41d2014-11-20 12:19:11 -0500862 kvfree(sbi->s_group_desc);
863 kvfree(sbi->s_flex_groups);
Theodore Ts'o57042652011-09-09 18:56:51 -0400864 percpu_counter_destroy(&sbi->s_freeclusters_counter);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700865 percpu_counter_destroy(&sbi->s_freeinodes_counter);
866 percpu_counter_destroy(&sbi->s_dirs_counter);
Theodore Ts'o57042652011-09-09 18:56:51 -0400867 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
Daeho Jeongc8585c62016-04-25 23:22:35 -0400868 percpu_free_rwsem(&sbi->s_journal_flag_rwsem);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700869 brelse(sbi->s_sbh);
870#ifdef CONFIG_QUOTA
Jan Karaa2d4a642014-09-11 11:15:15 -0400871 for (i = 0; i < EXT4_MAXQUOTAS; i++)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700872 kfree(sbi->s_qf_names[i]);
873#endif
874
875 /* Debugging code just in case the in-memory inode orphan list
876 * isn't empty. The on-disk one can be non-empty if we've
877 * detected an error and taken the fs readonly, but the
878 * in-memory list had better be clean by this point. */
879 if (!list_empty(&sbi->s_orphan))
880 dump_orphan_list(sb, sbi);
881 J_ASSERT(list_empty(&sbi->s_orphan));
882
Theodore Ts'o89d96a62015-06-20 22:50:33 -0400883 sync_blockdev(sb->s_bdev);
Peter Zijlstraf98393a2007-05-06 14:49:54 -0700884 invalidate_bdev(sb->s_bdev);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700885 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
886 /*
887 * Invalidate the journal device's buffers. We don't want them
888 * floating about in memory - the physical journal device may
889 * hotswapped, and it breaks the `ro-after' testing code.
890 */
891 sync_blockdev(sbi->journal_bdev);
Peter Zijlstraf98393a2007-05-06 14:49:54 -0700892 invalidate_bdev(sbi->journal_bdev);
Mingming Cao617ba132006-10-11 01:20:53 -0700893 ext4_blkdev_remove(sbi);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700894 }
T Makphaibulchoke9c191f72014-03-18 19:24:49 -0400895 if (sbi->s_mb_cache) {
896 ext4_xattr_destroy_cache(sbi->s_mb_cache);
897 sbi->s_mb_cache = NULL;
898 }
Johann Lombardic5e06d12011-05-24 18:31:25 -0400899 if (sbi->s_mmp_tsk)
900 kthread_stop(sbi->s_mmp_tsk);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700901 sb->s_fs_info = NULL;
Theodore Ts'o3197ebd2009-03-31 09:10:09 -0400902 /*
903 * Now that we are completely done shutting down the
904 * superblock, we need to actually destroy the kobject.
905 */
Theodore Ts'o3197ebd2009-03-31 09:10:09 -0400906 kobject_put(&sbi->s_kobj);
907 wait_for_completion(&sbi->s_kobj_unregister);
Darrick J. Wong04419842012-04-29 18:27:10 -0400908 if (sbi->s_chksum_driver)
909 crypto_free_shash(sbi->s_chksum_driver);
Pekka Enberg705895b2009-02-15 18:07:52 -0500910 kfree(sbi->s_blockgroup_lock);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700911 kfree(sbi);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700912}
913
Christoph Lametere18b8902006-12-06 20:33:20 -0800914static struct kmem_cache *ext4_inode_cachep;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700915
916/*
917 * Called inside transaction, so use GFP_NOFS
918 */
Mingming Cao617ba132006-10-11 01:20:53 -0700919static struct inode *ext4_alloc_inode(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700920{
Mingming Cao617ba132006-10-11 01:20:53 -0700921 struct ext4_inode_info *ei;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700922
Christoph Lametere6b4f8d2006-12-06 20:33:14 -0800923 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700924 if (!ei)
925 return NULL;
Andreas Dilger0b8e58a2009-06-03 17:59:28 -0400926
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700927 ei->vfs_inode.i_version = 1;
Theodore Ts'o202ee5d2014-04-21 14:37:55 -0400928 spin_lock_init(&ei->i_raw_lock);
Alex Tomasc9de5602008-01-29 00:19:52 -0500929 INIT_LIST_HEAD(&ei->i_prealloc_list);
930 spin_lock_init(&ei->i_prealloc_lock);
Zheng Liu9a26b662012-11-08 21:57:30 -0500931 ext4_es_init_tree(&ei->i_es_tree);
932 rwlock_init(&ei->i_es_lock);
Zheng Liuedaa53c2014-11-25 11:45:37 -0500933 INIT_LIST_HEAD(&ei->i_es_list);
Zheng Liueb68d0e2014-09-01 22:26:49 -0400934 ei->i_es_all_nr = 0;
Zheng Liuedaa53c2014-11-25 11:45:37 -0500935 ei->i_es_shk_nr = 0;
Jan Karadd475922014-11-25 11:51:23 -0500936 ei->i_es_shrink_lblk = 0;
Mingming Caod2a17632008-07-14 17:52:37 -0400937 ei->i_reserved_data_blocks = 0;
938 ei->i_reserved_meta_blocks = 0;
939 ei->i_allocated_meta_blocks = 0;
Theodore Ts'o9d0be502010-01-01 02:41:30 -0500940 ei->i_da_metadata_calc_len = 0;
Theodore Ts'o7e731bc2012-08-05 23:28:16 -0400941 ei->i_da_metadata_calc_last_lblock = 0;
Mingming Caod2a17632008-07-14 17:52:37 -0400942 spin_lock_init(&(ei->i_block_reservation_lock));
Dmitry Monakhova9e7f442009-12-14 15:21:14 +0300943#ifdef CONFIG_QUOTA
944 ei->i_reserved_quota = 0;
Jan Kara96c7e0d2014-09-29 14:58:25 +0200945 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
Dmitry Monakhova9e7f442009-12-14 15:21:14 +0300946#endif
Theodore Ts'o8aefcd52011-01-10 12:29:43 -0500947 ei->jinode = NULL;
Jan Kara2e8fa542013-06-04 14:21:02 -0400948 INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
Jiaying Zhang744692d2010-03-04 16:14:02 -0500949 spin_lock_init(&ei->i_completed_io_lock);
Jan Karab436b9b2009-12-08 23:51:10 -0500950 ei->i_sync_tid = 0;
951 ei->i_datasync_tid = 0;
Dmitry Monakhove27f41e2012-09-28 23:24:52 -0400952 atomic_set(&ei->i_unwritten, 0);
Jan Kara2e8fa542013-06-04 14:21:02 -0400953 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700954 return &ei->vfs_inode;
955}
956
Theodore Ts'o7ff9c072010-11-08 13:51:33 -0500957static int ext4_drop_inode(struct inode *inode)
958{
959 int drop = generic_drop_inode(inode);
960
961 trace_ext4_drop_inode(inode, drop);
962 return drop;
963}
964
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100965static void ext4_i_callback(struct rcu_head *head)
966{
967 struct inode *inode = container_of(head, struct inode, i_rcu);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100968 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
969}
970
Mingming Cao617ba132006-10-11 01:20:53 -0700971static void ext4_destroy_inode(struct inode *inode)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700972{
Vasily Averin9f7dd932007-07-15 23:40:45 -0700973 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
Eric Sandeenb31e1552009-06-04 17:36:36 -0400974 ext4_msg(inode->i_sb, KERN_ERR,
975 "Inode %lu (%p): orphan list check failed!",
976 inode->i_ino, EXT4_I(inode));
Vasily Averin9f7dd932007-07-15 23:40:45 -0700977 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
978 EXT4_I(inode), sizeof(struct ext4_inode_info),
979 true);
980 dump_stack();
981 }
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100982 call_rcu(&inode->i_rcu, ext4_i_callback);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700983}
984
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700985static void init_once(void *foo)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700986{
Mingming Cao617ba132006-10-11 01:20:53 -0700987 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700988
Christoph Lametera35afb82007-05-16 22:10:57 -0700989 INIT_LIST_HEAD(&ei->i_orphan);
Christoph Lametera35afb82007-05-16 22:10:57 -0700990 init_rwsem(&ei->xattr_sem);
Aneesh Kumar K.V0e855ac2008-01-28 23:58:26 -0500991 init_rwsem(&ei->i_data_sem);
Jan Karaea3d7202015-12-07 14:28:03 -0500992 init_rwsem(&ei->i_mmap_sem);
Christoph Lametera35afb82007-05-16 22:10:57 -0700993 inode_init_once(&ei->vfs_inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700994}
995
Fabian Fredericke67bc2b2014-02-17 20:34:53 -0500996static int __init init_inodecache(void)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700997{
Mingming Cao617ba132006-10-11 01:20:53 -0700998 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
999 sizeof(struct ext4_inode_info),
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001000 0, (SLAB_RECLAIM_ACCOUNT|
Vladimir Davydov5d097052016-01-14 15:18:21 -08001001 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
Paul Mundt20c2df82007-07-20 10:11:58 +09001002 init_once);
Mingming Cao617ba132006-10-11 01:20:53 -07001003 if (ext4_inode_cachep == NULL)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001004 return -ENOMEM;
1005 return 0;
1006}
1007
1008static void destroy_inodecache(void)
1009{
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +10001010 /*
1011 * Make sure all delayed rcu free inodes are flushed before we
1012 * destroy cache.
1013 */
1014 rcu_barrier();
Mingming Cao617ba132006-10-11 01:20:53 -07001015 kmem_cache_destroy(ext4_inode_cachep);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001016}
1017
Al Viro0930fcc2010-06-07 13:16:22 -04001018void ext4_clear_inode(struct inode *inode)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001019{
Al Viro0930fcc2010-06-07 13:16:22 -04001020 invalidate_inode_buffers(inode);
Jan Karadbd57682012-05-03 14:48:02 +02001021 clear_inode(inode);
Christoph Hellwig9f754752010-03-03 09:05:05 -05001022 dquot_drop(inode);
Theodore Ts'oc2ea3fd2008-10-10 09:40:52 -04001023 ext4_discard_preallocations(inode);
Zheng Liu51865fd2012-11-08 21:57:32 -05001024 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
Theodore Ts'o8aefcd52011-01-10 12:29:43 -05001025 if (EXT4_I(inode)->jinode) {
1026 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1027 EXT4_I(inode)->jinode);
1028 jbd2_free_inode(EXT4_I(inode)->jinode);
1029 EXT4_I(inode)->jinode = NULL;
1030 }
Theodore Ts'ob7236e22015-05-18 13:17:47 -04001031#ifdef CONFIG_EXT4_FS_ENCRYPTION
Jaegeuk Kima7550b32016-07-10 14:01:03 -04001032 fscrypt_put_encryption_info(inode, NULL);
Theodore Ts'ob7236e22015-05-18 13:17:47 -04001033#endif
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001034}
1035
Christoph Hellwig1b961ac2007-10-21 16:42:08 -07001036static struct inode *ext4_nfs_get_inode(struct super_block *sb,
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04001037 u64 ino, u32 generation)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001038{
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001039 struct inode *inode;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001040
Mingming Cao617ba132006-10-11 01:20:53 -07001041 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001042 return ERR_PTR(-ESTALE);
Mingming Cao617ba132006-10-11 01:20:53 -07001043 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001044 return ERR_PTR(-ESTALE);
1045
1046 /* iget isn't really right if the inode is currently unallocated!!
1047 *
Mingming Cao617ba132006-10-11 01:20:53 -07001048 * ext4_read_inode will return a bad_inode if the inode had been
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001049 * deleted, so we should be safe.
1050 *
1051 * Currently we don't know the generation for parent directory, so
1052 * a generation of 0 means "accept any"
1053 */
Theodore Ts'of4bb2982014-10-05 22:56:00 -04001054 inode = ext4_iget_normal(sb, ino);
David Howells1d1fe1e2008-02-07 00:15:37 -08001055 if (IS_ERR(inode))
1056 return ERR_CAST(inode);
1057 if (generation && inode->i_generation != generation) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001058 iput(inode);
1059 return ERR_PTR(-ESTALE);
1060 }
Christoph Hellwig1b961ac2007-10-21 16:42:08 -07001061
1062 return inode;
1063}
1064
1065static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04001066 int fh_len, int fh_type)
Christoph Hellwig1b961ac2007-10-21 16:42:08 -07001067{
1068 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1069 ext4_nfs_get_inode);
1070}
1071
1072static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04001073 int fh_len, int fh_type)
Christoph Hellwig1b961ac2007-10-21 16:42:08 -07001074{
1075 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1076 ext4_nfs_get_inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001077}
1078
Theodore Ts'o40a19e52018-12-19 14:07:58 -05001079static int ext4_nfs_commit_metadata(struct inode *inode)
1080{
1081 struct writeback_control wbc = {
1082 .sync_mode = WB_SYNC_ALL
1083 };
1084
1085 trace_ext4_nfs_commit_metadata(inode);
1086 return ext4_write_inode(inode, &wbc);
1087}
1088
Toshiyuki Okajimac39a7f82009-01-05 22:38:48 -05001089/*
1090 * Try to release metadata pages (indirect blocks, directories) which are
1091 * mapped via the block device. Since these pages could have journal heads
1092 * which would prevent try_to_free_buffers() from freeing them, we must use
1093 * jbd2 layer's try_to_free_buffers() function to release them.
1094 */
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04001095static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1096 gfp_t wait)
Toshiyuki Okajimac39a7f82009-01-05 22:38:48 -05001097{
1098 journal_t *journal = EXT4_SB(sb)->s_journal;
1099
1100 WARN_ON(PageChecked(page));
1101 if (!page_has_buffers(page))
1102 return 0;
1103 if (journal)
1104 return jbd2_journal_try_to_free_buffers(journal, page,
Mel Gormand0164ad2015-11-06 16:28:21 -08001105 wait & ~__GFP_DIRECT_RECLAIM);
Toshiyuki Okajimac39a7f82009-01-05 22:38:48 -05001106 return try_to_free_buffers(page);
1107}
1108
Jaegeuk Kima7550b32016-07-10 14:01:03 -04001109#ifdef CONFIG_EXT4_FS_ENCRYPTION
1110static int ext4_get_context(struct inode *inode, void *ctx, size_t len)
1111{
1112 return ext4_xattr_get(inode, EXT4_XATTR_INDEX_ENCRYPTION,
1113 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx, len);
1114}
1115
1116static int ext4_key_prefix(struct inode *inode, u8 **key)
1117{
1118 *key = EXT4_SB(inode->i_sb)->key_prefix;
1119 return EXT4_SB(inode->i_sb)->key_prefix_size;
1120}
1121
1122static int ext4_prepare_context(struct inode *inode)
1123{
1124 return ext4_convert_inline_data(inode);
1125}
1126
1127static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
1128 void *fs_data)
1129{
1130 handle_t *handle;
1131 int res, res2;
1132
1133 /* fs_data is null when internally used. */
1134 if (fs_data) {
1135 res = ext4_xattr_set(inode, EXT4_XATTR_INDEX_ENCRYPTION,
1136 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx,
1137 len, 0);
1138 if (!res) {
1139 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
1140 ext4_clear_inode_state(inode,
1141 EXT4_STATE_MAY_INLINE_DATA);
1142 }
1143 return res;
1144 }
1145
1146 handle = ext4_journal_start(inode, EXT4_HT_MISC,
1147 ext4_jbd2_credits_xattr(inode));
1148 if (IS_ERR(handle))
1149 return PTR_ERR(handle);
1150
1151 res = ext4_xattr_set(inode, EXT4_XATTR_INDEX_ENCRYPTION,
1152 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx,
1153 len, 0);
1154 if (!res) {
1155 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
1156 res = ext4_mark_inode_dirty(handle, inode);
1157 if (res)
1158 EXT4_ERROR_INODE(inode, "Failed to mark inode dirty");
1159 }
1160 res2 = ext4_journal_stop(handle);
1161 if (!res)
1162 res = res2;
1163 return res;
1164}
1165
1166static int ext4_dummy_context(struct inode *inode)
1167{
1168 return DUMMY_ENCRYPTION_ENABLED(EXT4_SB(inode->i_sb));
1169}
1170
1171static unsigned ext4_max_namelen(struct inode *inode)
1172{
1173 return S_ISLNK(inode->i_mode) ? inode->i_sb->s_blocksize :
1174 EXT4_NAME_LEN;
1175}
1176
1177static struct fscrypt_operations ext4_cryptops = {
1178 .get_context = ext4_get_context,
1179 .key_prefix = ext4_key_prefix,
1180 .prepare_context = ext4_prepare_context,
1181 .set_context = ext4_set_context,
1182 .dummy_context = ext4_dummy_context,
1183 .is_encrypted = ext4_encrypted_inode,
1184 .empty_dir = ext4_empty_dir,
1185 .max_namelen = ext4_max_namelen,
1186};
1187#else
1188static struct fscrypt_operations ext4_cryptops = {
1189 .is_encrypted = ext4_encrypted_inode,
1190};
1191#endif
1192
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001193#ifdef CONFIG_QUOTA
Li Xi689c9582016-01-08 16:01:22 -05001194static char *quotatypes[] = INITQFNAMES;
1195#define QTYPE2NAME(t) (quotatypes[t])
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001196
Mingming Cao617ba132006-10-11 01:20:53 -07001197static int ext4_write_dquot(struct dquot *dquot);
1198static int ext4_acquire_dquot(struct dquot *dquot);
1199static int ext4_release_dquot(struct dquot *dquot);
1200static int ext4_mark_dquot_dirty(struct dquot *dquot);
1201static int ext4_write_info(struct super_block *sb, int type);
Jan Kara6f28e082008-04-28 02:14:34 -07001202static int ext4_quota_on(struct super_block *sb, int type, int format_id,
Jan Karaf00c9e42010-09-15 17:38:58 +02001203 struct path *path);
Dmitry Monakhovca0e05e2010-08-01 17:48:36 -04001204static int ext4_quota_off(struct super_block *sb, int type);
Mingming Cao617ba132006-10-11 01:20:53 -07001205static int ext4_quota_on_mount(struct super_block *sb, int type);
1206static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001207 size_t len, loff_t off);
Mingming Cao617ba132006-10-11 01:20:53 -07001208static ssize_t ext4_quota_write(struct super_block *sb, int type,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001209 const char *data, size_t len, loff_t off);
Aditya Kali7c319d32012-07-22 20:21:31 -04001210static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1211 unsigned int flags);
1212static int ext4_enable_quotas(struct super_block *sb);
Theodore Ts'o8f0e8742016-04-01 12:00:03 -04001213static int ext4_get_next_id(struct super_block *sb, struct kqid *qid);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001214
Jan Kara96c7e0d2014-09-29 14:58:25 +02001215static struct dquot **ext4_get_dquots(struct inode *inode)
1216{
1217 return EXT4_I(inode)->i_dquot;
1218}
1219
Alexey Dobriyan61e225d2009-09-21 17:01:08 -07001220static const struct dquot_operations ext4_quota_operations = {
Mingming Cao60e58e02009-01-22 18:13:05 +01001221 .get_reserved_space = ext4_get_reserved_space,
Mingming Cao617ba132006-10-11 01:20:53 -07001222 .write_dquot = ext4_write_dquot,
1223 .acquire_dquot = ext4_acquire_dquot,
1224 .release_dquot = ext4_release_dquot,
1225 .mark_dirty = ext4_mark_dquot_dirty,
Jan Karaa5b5ee32008-11-25 15:31:35 +01001226 .write_info = ext4_write_info,
1227 .alloc_dquot = dquot_alloc,
1228 .destroy_dquot = dquot_destroy,
Li Xi040cb372016-01-08 16:01:21 -05001229 .get_projid = ext4_get_projid,
Theodore Ts'o8f0e8742016-04-01 12:00:03 -04001230 .get_next_id = ext4_get_next_id,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001231};
1232
Alexey Dobriyan0d54b212009-09-21 17:01:09 -07001233static const struct quotactl_ops ext4_qctl_operations = {
Mingming Cao617ba132006-10-11 01:20:53 -07001234 .quota_on = ext4_quota_on,
Dmitry Monakhovca0e05e2010-08-01 17:48:36 -04001235 .quota_off = ext4_quota_off,
Christoph Hellwig287a8092010-05-19 07:16:45 -04001236 .quota_sync = dquot_quota_sync,
Jan Kara0a2403392014-11-19 00:42:09 +01001237 .get_state = dquot_get_state,
Christoph Hellwig287a8092010-05-19 07:16:45 -04001238 .set_info = dquot_set_dqinfo,
1239 .get_dqblk = dquot_get_dqblk,
Eric Sandeen6332b9b2016-02-19 19:19:01 +01001240 .set_dqblk = dquot_set_dqblk,
1241 .get_nextdqblk = dquot_get_next_dqblk,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001242};
1243#endif
1244
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -08001245static const struct super_operations ext4_sops = {
Mingming Cao617ba132006-10-11 01:20:53 -07001246 .alloc_inode = ext4_alloc_inode,
1247 .destroy_inode = ext4_destroy_inode,
Mingming Cao617ba132006-10-11 01:20:53 -07001248 .write_inode = ext4_write_inode,
1249 .dirty_inode = ext4_dirty_inode,
Theodore Ts'o7ff9c072010-11-08 13:51:33 -05001250 .drop_inode = ext4_drop_inode,
Al Viro0930fcc2010-06-07 13:16:22 -04001251 .evict_inode = ext4_evict_inode,
Mingming Cao617ba132006-10-11 01:20:53 -07001252 .put_super = ext4_put_super,
Mingming Cao617ba132006-10-11 01:20:53 -07001253 .sync_fs = ext4_sync_fs,
Takashi Satoc4be0c12009-01-09 16:40:58 -08001254 .freeze_fs = ext4_freeze,
1255 .unfreeze_fs = ext4_unfreeze,
Mingming Cao617ba132006-10-11 01:20:53 -07001256 .statfs = ext4_statfs,
1257 .remount_fs = ext4_remount,
Mingming Cao617ba132006-10-11 01:20:53 -07001258 .show_options = ext4_show_options,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001259#ifdef CONFIG_QUOTA
Mingming Cao617ba132006-10-11 01:20:53 -07001260 .quota_read = ext4_quota_read,
1261 .quota_write = ext4_quota_write,
Jan Kara96c7e0d2014-09-29 14:58:25 +02001262 .get_dquots = ext4_get_dquots,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001263#endif
Toshiyuki Okajimac39a7f82009-01-05 22:38:48 -05001264 .bdev_try_to_free_page = bdev_try_to_free_page,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001265};
1266
Christoph Hellwig39655162007-10-21 16:42:17 -07001267static const struct export_operations ext4_export_ops = {
Christoph Hellwig1b961ac2007-10-21 16:42:08 -07001268 .fh_to_dentry = ext4_fh_to_dentry,
1269 .fh_to_parent = ext4_fh_to_parent,
Mingming Cao617ba132006-10-11 01:20:53 -07001270 .get_parent = ext4_get_parent,
Theodore Ts'o40a19e52018-12-19 14:07:58 -05001271 .commit_metadata = ext4_nfs_commit_metadata,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001272};
1273
1274enum {
1275 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1276 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
Theodore Ts'o72578c32012-03-03 18:04:40 -05001277 Opt_nouid32, Opt_debug, Opt_removed,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001278 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
Theodore Ts'o72578c32012-03-03 18:04:40 -05001279 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
Eric Sandeenad4eec62013-08-28 19:05:07 -04001280 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1281 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001282 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
Theodore Ts'o6ddb2442015-04-16 01:56:00 -04001283 Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001284 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
Jan Kara5a20bdf2009-11-30 23:58:32 +01001285 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
Theodore Ts'oee4a3fc2012-03-02 12:14:24 -05001286 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
Jan Kara49da9392016-09-05 23:08:16 -04001287 Opt_usrquota, Opt_grpquota, Opt_prjquota, Opt_i_version, Opt_dax,
Theodore Ts'o14490322010-12-14 15:27:50 -05001288 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
Theodore Ts'oa26f4992015-02-02 00:37:02 -05001289 Opt_lazytime, Opt_nolazytime,
Theodore Ts'o14490322010-12-14 15:27:50 -05001290 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
Eric Sandeen5328e632009-11-19 14:25:42 -05001291 Opt_inode_readahead_blks, Opt_journal_ioprio,
Jiaying Zhang744692d2010-03-04 16:14:02 -05001292 Opt_dioread_nolock, Opt_dioread_lock,
Theodore Ts'ofc6cb1c2011-12-12 22:06:18 -05001293 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
Darrick J. Wongc6d3d562014-11-25 16:20:50 -05001294 Opt_max_dir_size_kb, Opt_nojournal_checksum,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001295};
1296
Steven Whitehousea447c092008-10-13 10:46:57 +01001297static const match_table_t tokens = {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001298 {Opt_bsd_df, "bsddf"},
1299 {Opt_minix_df, "minixdf"},
1300 {Opt_grpid, "grpid"},
1301 {Opt_grpid, "bsdgroups"},
1302 {Opt_nogrpid, "nogrpid"},
1303 {Opt_nogrpid, "sysvgroups"},
1304 {Opt_resgid, "resgid=%u"},
1305 {Opt_resuid, "resuid=%u"},
1306 {Opt_sb, "sb=%u"},
1307 {Opt_err_cont, "errors=continue"},
1308 {Opt_err_panic, "errors=panic"},
1309 {Opt_err_ro, "errors=remount-ro"},
1310 {Opt_nouid32, "nouid32"},
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001311 {Opt_debug, "debug"},
Theodore Ts'o72578c32012-03-03 18:04:40 -05001312 {Opt_removed, "oldalloc"},
1313 {Opt_removed, "orlov"},
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001314 {Opt_user_xattr, "user_xattr"},
1315 {Opt_nouser_xattr, "nouser_xattr"},
1316 {Opt_acl, "acl"},
1317 {Opt_noacl, "noacl"},
Eric Sandeene3bb52a2009-11-19 14:28:50 -05001318 {Opt_noload, "norecovery"},
Theodore Ts'o5a916be2012-03-04 19:27:31 -05001319 {Opt_noload, "noload"},
Theodore Ts'o72578c32012-03-03 18:04:40 -05001320 {Opt_removed, "nobh"},
1321 {Opt_removed, "bh"},
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001322 {Opt_commit, "commit=%u"},
Theodore Ts'o30773842009-01-03 20:27:38 -05001323 {Opt_min_batch_time, "min_batch_time=%u"},
1324 {Opt_max_batch_time, "max_batch_time=%u"},
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001325 {Opt_journal_dev, "journal_dev=%u"},
Eric Sandeenad4eec62013-08-28 19:05:07 -04001326 {Opt_journal_path, "journal_path=%s"},
Girish Shilamkar818d2762008-01-28 23:58:27 -05001327 {Opt_journal_checksum, "journal_checksum"},
Darrick J. Wongc6d3d562014-11-25 16:20:50 -05001328 {Opt_nojournal_checksum, "nojournal_checksum"},
Girish Shilamkar818d2762008-01-28 23:58:27 -05001329 {Opt_journal_async_commit, "journal_async_commit"},
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001330 {Opt_abort, "abort"},
1331 {Opt_data_journal, "data=journal"},
1332 {Opt_data_ordered, "data=ordered"},
1333 {Opt_data_writeback, "data=writeback"},
Hidehiro Kawai5bf56832008-10-10 22:12:43 -04001334 {Opt_data_err_abort, "data_err=abort"},
1335 {Opt_data_err_ignore, "data_err=ignore"},
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001336 {Opt_offusrjquota, "usrjquota="},
1337 {Opt_usrjquota, "usrjquota=%s"},
1338 {Opt_offgrpjquota, "grpjquota="},
1339 {Opt_grpjquota, "grpjquota=%s"},
1340 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1341 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
Jan Kara5a20bdf2009-11-30 23:58:32 +01001342 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001343 {Opt_grpquota, "grpquota"},
1344 {Opt_noquota, "noquota"},
1345 {Opt_quota, "quota"},
1346 {Opt_usrquota, "usrquota"},
Jan Kara49da9392016-09-05 23:08:16 -04001347 {Opt_prjquota, "prjquota"},
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001348 {Opt_barrier, "barrier=%u"},
Theodore Ts'o06705bf2009-03-28 10:59:57 -04001349 {Opt_barrier, "barrier"},
1350 {Opt_nobarrier, "nobarrier"},
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -05001351 {Opt_i_version, "i_version"},
Ross Zwisler923ae0f2015-02-16 15:59:38 -08001352 {Opt_dax, "dax"},
Alex Tomasc9de5602008-01-29 00:19:52 -05001353 {Opt_stripe, "stripe=%u"},
Alex Tomas64769242008-07-11 19:27:31 -04001354 {Opt_delalloc, "delalloc"},
Theodore Ts'oa26f4992015-02-02 00:37:02 -05001355 {Opt_lazytime, "lazytime"},
1356 {Opt_nolazytime, "nolazytime"},
Aneesh Kumar K.Vdd919b92008-07-11 19:27:31 -04001357 {Opt_nodelalloc, "nodelalloc"},
Jan Kara36ade452013-01-28 09:30:52 -05001358 {Opt_removed, "mblk_io_submit"},
1359 {Opt_removed, "nomblk_io_submit"},
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04001360 {Opt_block_validity, "block_validity"},
1361 {Opt_noblock_validity, "noblock_validity"},
Theodore Ts'o240799c2008-10-09 23:53:47 -04001362 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
Theodore Ts'ob3881f72009-01-05 22:46:26 -05001363 {Opt_journal_ioprio, "journal_ioprio=%u"},
Theodore Ts'oafd46722009-03-16 23:12:23 -04001364 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
Theodore Ts'o06705bf2009-03-28 10:59:57 -04001365 {Opt_auto_da_alloc, "auto_da_alloc"},
1366 {Opt_noauto_da_alloc, "noauto_da_alloc"},
Jiaying Zhang744692d2010-03-04 16:14:02 -05001367 {Opt_dioread_nolock, "dioread_nolock"},
1368 {Opt_dioread_lock, "dioread_lock"},
Eric Sandeen5328e632009-11-19 14:25:42 -05001369 {Opt_discard, "discard"},
1370 {Opt_nodiscard, "nodiscard"},
Theodore Ts'ofc6cb1c2011-12-12 22:06:18 -05001371 {Opt_init_itable, "init_itable=%u"},
1372 {Opt_init_itable, "init_itable"},
1373 {Opt_noinit_itable, "noinit_itable"},
Theodore Ts'odf981d02012-08-17 09:48:17 -04001374 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
Theodore Ts'o6ddb2442015-04-16 01:56:00 -04001375 {Opt_test_dummy_encryption, "test_dummy_encryption"},
Theodore Ts'oc7198b92012-03-04 22:00:53 -05001376 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1377 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1378 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1379 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1380 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
Josef Bacikf3f12fa2008-04-29 22:05:28 -04001381 {Opt_err, NULL},
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001382};
1383
Mingming Cao617ba132006-10-11 01:20:53 -07001384static ext4_fsblk_t get_sb_block(void **data)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001385{
Mingming Cao617ba132006-10-11 01:20:53 -07001386 ext4_fsblk_t sb_block;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001387 char *options = (char *) *data;
1388
1389 if (!options || strncmp(options, "sb=", 3) != 0)
1390 return 1; /* Default location */
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04001391
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001392 options += 3;
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04001393 /* TODO: use simple_strtoll with >32bit ext4 */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001394 sb_block = simple_strtoul(options, &options, 0);
1395 if (*options && *options != ',') {
Theodore Ts'o4776004f2008-09-08 23:00:52 -04001396 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001397 (char *) *data);
1398 return 1;
1399 }
1400 if (*options == ',')
1401 options++;
1402 *data = (void *) options;
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04001403
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001404 return sb_block;
1405}
1406
Theodore Ts'ob3881f72009-01-05 22:46:26 -05001407#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
Dmitry Monakhov437ca0f2010-03-01 22:29:21 -05001408static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1409 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
Theodore Ts'ob3881f72009-01-05 22:46:26 -05001410
Dmitry Monakhov56c50f12010-03-01 23:28:41 -05001411#ifdef CONFIG_QUOTA
1412static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1413{
1414 struct ext4_sb_info *sbi = EXT4_SB(sb);
1415 char *qname;
Chen Gang03dafb52013-01-24 23:24:58 -05001416 int ret = -1;
Dmitry Monakhov56c50f12010-03-01 23:28:41 -05001417
1418 if (sb_any_quota_loaded(sb) &&
1419 !sbi->s_qf_names[qtype]) {
1420 ext4_msg(sb, KERN_ERR,
1421 "Cannot change journaled "
1422 "quota options when quota turned on");
Theodore Ts'o57f73c22012-04-16 18:55:26 -04001423 return -1;
Dmitry Monakhov56c50f12010-03-01 23:28:41 -05001424 }
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04001425 if (ext4_has_feature_quota(sb)) {
Theodore Ts'oc325a672016-04-03 17:03:37 -04001426 ext4_msg(sb, KERN_INFO, "Journaled quota options "
1427 "ignored when QUOTA feature is enabled");
1428 return 1;
Jan Kara262b4662013-03-02 17:57:08 -05001429 }
Dmitry Monakhov56c50f12010-03-01 23:28:41 -05001430 qname = match_strdup(args);
1431 if (!qname) {
1432 ext4_msg(sb, KERN_ERR,
1433 "Not enough memory for storing quotafile name");
Theodore Ts'o57f73c22012-04-16 18:55:26 -04001434 return -1;
Dmitry Monakhov56c50f12010-03-01 23:28:41 -05001435 }
Chen Gang03dafb52013-01-24 23:24:58 -05001436 if (sbi->s_qf_names[qtype]) {
1437 if (strcmp(sbi->s_qf_names[qtype], qname) == 0)
1438 ret = 1;
1439 else
1440 ext4_msg(sb, KERN_ERR,
1441 "%s quota file already specified",
1442 QTYPE2NAME(qtype));
1443 goto errout;
Dmitry Monakhov56c50f12010-03-01 23:28:41 -05001444 }
Chen Gang03dafb52013-01-24 23:24:58 -05001445 if (strchr(qname, '/')) {
Dmitry Monakhov56c50f12010-03-01 23:28:41 -05001446 ext4_msg(sb, KERN_ERR,
1447 "quotafile must be on filesystem root");
Chen Gang03dafb52013-01-24 23:24:58 -05001448 goto errout;
Dmitry Monakhov56c50f12010-03-01 23:28:41 -05001449 }
Chen Gang03dafb52013-01-24 23:24:58 -05001450 sbi->s_qf_names[qtype] = qname;
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05001451 set_opt(sb, QUOTA);
Dmitry Monakhov56c50f12010-03-01 23:28:41 -05001452 return 1;
Chen Gang03dafb52013-01-24 23:24:58 -05001453errout:
1454 kfree(qname);
1455 return ret;
Dmitry Monakhov56c50f12010-03-01 23:28:41 -05001456}
1457
1458static int clear_qf_name(struct super_block *sb, int qtype)
1459{
1460
1461 struct ext4_sb_info *sbi = EXT4_SB(sb);
1462
1463 if (sb_any_quota_loaded(sb) &&
1464 sbi->s_qf_names[qtype]) {
1465 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1466 " when quota turned on");
Theodore Ts'o57f73c22012-04-16 18:55:26 -04001467 return -1;
Dmitry Monakhov56c50f12010-03-01 23:28:41 -05001468 }
Chen Gang03dafb52013-01-24 23:24:58 -05001469 kfree(sbi->s_qf_names[qtype]);
Dmitry Monakhov56c50f12010-03-01 23:28:41 -05001470 sbi->s_qf_names[qtype] = NULL;
1471 return 1;
1472}
1473#endif
1474
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001475#define MOPT_SET 0x0001
1476#define MOPT_CLEAR 0x0002
1477#define MOPT_NOSUPPORT 0x0004
1478#define MOPT_EXPLICIT 0x0008
1479#define MOPT_CLEAR_ERR 0x0010
1480#define MOPT_GTE0 0x0020
1481#ifdef CONFIG_QUOTA
1482#define MOPT_Q 0
1483#define MOPT_QFMT 0x0040
1484#else
1485#define MOPT_Q MOPT_NOSUPPORT
1486#define MOPT_QFMT MOPT_NOSUPPORT
1487#endif
1488#define MOPT_DATAJ 0x0080
Theodore Ts'o8dc0aa82013-02-02 23:38:39 -05001489#define MOPT_NO_EXT2 0x0100
1490#define MOPT_NO_EXT3 0x0200
1491#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
Eric Sandeenad4eec62013-08-28 19:05:07 -04001492#define MOPT_STRING 0x0400
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001493
1494static const struct mount_opts {
1495 int token;
1496 int mount_opt;
1497 int flags;
1498} ext4_mount_opts[] = {
1499 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1500 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1501 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1502 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001503 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1504 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
Theodore Ts'o8dc0aa82013-02-02 23:38:39 -05001505 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1506 MOPT_EXT4_ONLY | MOPT_SET},
1507 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1508 MOPT_EXT4_ONLY | MOPT_CLEAR},
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001509 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1510 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
Theodore Ts'o8dc0aa82013-02-02 23:38:39 -05001511 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1512 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1513 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
Theodore Ts'o59d9fa52013-08-08 23:01:24 -04001514 MOPT_EXT4_ONLY | MOPT_CLEAR},
Darrick J. Wongc6d3d562014-11-25 16:20:50 -05001515 {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1516 MOPT_EXT4_ONLY | MOPT_CLEAR},
Theodore Ts'o8dc0aa82013-02-02 23:38:39 -05001517 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
Dmitry Monakhov1e381f62015-10-18 23:50:26 -04001518 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001519 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
Theodore Ts'o8dc0aa82013-02-02 23:38:39 -05001520 EXT4_MOUNT_JOURNAL_CHECKSUM),
Dmitry Monakhov1e381f62015-10-18 23:50:26 -04001521 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
Theodore Ts'o8dc0aa82013-02-02 23:38:39 -05001522 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001523 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1524 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1525 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
Theodore Ts'o8dc0aa82013-02-02 23:38:39 -05001526 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
Ales Novak7915a862016-03-12 21:55:50 -05001527 MOPT_NO_EXT2},
Theodore Ts'o8dc0aa82013-02-02 23:38:39 -05001528 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
Ales Novak7915a862016-03-12 21:55:50 -05001529 MOPT_NO_EXT2},
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001530 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1531 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1532 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1533 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1534 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1535 {Opt_commit, 0, MOPT_GTE0},
1536 {Opt_max_batch_time, 0, MOPT_GTE0},
1537 {Opt_min_batch_time, 0, MOPT_GTE0},
1538 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1539 {Opt_init_itable, 0, MOPT_GTE0},
Ross Zwisler923ae0f2015-02-16 15:59:38 -08001540 {Opt_dax, EXT4_MOUNT_DAX, MOPT_SET},
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001541 {Opt_stripe, 0, MOPT_GTE0},
Jan Kara0efb3b22013-02-02 22:52:19 -05001542 {Opt_resuid, 0, MOPT_GTE0},
1543 {Opt_resgid, 0, MOPT_GTE0},
Carlos Maiolino5ba92bc2015-07-21 23:57:59 -04001544 {Opt_journal_dev, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1545 {Opt_journal_path, 0, MOPT_NO_EXT2 | MOPT_STRING},
1546 {Opt_journal_ioprio, 0, MOPT_NO_EXT2 | MOPT_GTE0},
Theodore Ts'o8dc0aa82013-02-02 23:38:39 -05001547 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1548 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1549 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1550 MOPT_NO_EXT2 | MOPT_DATAJ},
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001551 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1552 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001553#ifdef CONFIG_EXT4_FS_POSIX_ACL
1554 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1555 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
1556#else
1557 {Opt_acl, 0, MOPT_NOSUPPORT},
1558 {Opt_noacl, 0, MOPT_NOSUPPORT},
1559#endif
1560 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1561 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1562 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1563 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1564 MOPT_SET | MOPT_Q},
1565 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1566 MOPT_SET | MOPT_Q},
Jan Kara49da9392016-09-05 23:08:16 -04001567 {Opt_prjquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_PRJQUOTA,
1568 MOPT_SET | MOPT_Q},
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001569 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
Jan Kara49da9392016-09-05 23:08:16 -04001570 EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA),
1571 MOPT_CLEAR | MOPT_Q},
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001572 {Opt_usrjquota, 0, MOPT_Q},
1573 {Opt_grpjquota, 0, MOPT_Q},
1574 {Opt_offusrjquota, 0, MOPT_Q},
1575 {Opt_offgrpjquota, 0, MOPT_Q},
1576 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1577 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1578 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
Theodore Ts'odf981d02012-08-17 09:48:17 -04001579 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
Theodore Ts'o6ddb2442015-04-16 01:56:00 -04001580 {Opt_test_dummy_encryption, 0, MOPT_GTE0},
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001581 {Opt_err, 0, 0}
1582};
1583
1584static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1585 substring_t *args, unsigned long *journal_devnum,
1586 unsigned int *journal_ioprio, int is_remount)
1587{
1588 struct ext4_sb_info *sbi = EXT4_SB(sb);
1589 const struct mount_opts *m;
Eric W. Biederman08cefc72012-02-07 15:41:49 -08001590 kuid_t uid;
1591 kgid_t gid;
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001592 int arg = 0;
1593
Theodore Ts'o57f73c22012-04-16 18:55:26 -04001594#ifdef CONFIG_QUOTA
1595 if (token == Opt_usrjquota)
1596 return set_qf_name(sb, USRQUOTA, &args[0]);
1597 else if (token == Opt_grpjquota)
1598 return set_qf_name(sb, GRPQUOTA, &args[0]);
1599 else if (token == Opt_offusrjquota)
1600 return clear_qf_name(sb, USRQUOTA);
1601 else if (token == Opt_offgrpjquota)
1602 return clear_qf_name(sb, GRPQUOTA);
1603#endif
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001604 switch (token) {
Theodore Ts'of7048602012-03-04 22:06:20 -05001605 case Opt_noacl:
1606 case Opt_nouser_xattr:
1607 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1608 break;
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001609 case Opt_sb:
1610 return 1; /* handled by get_sb_block() */
1611 case Opt_removed:
Jan Kara5f3633e2013-02-02 23:09:36 -05001612 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001613 return 1;
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001614 case Opt_abort:
1615 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1616 return 1;
1617 case Opt_i_version:
1618 sb->s_flags |= MS_I_VERSION;
1619 return 1;
Theodore Ts'oa26f4992015-02-02 00:37:02 -05001620 case Opt_lazytime:
1621 sb->s_flags |= MS_LAZYTIME;
1622 return 1;
1623 case Opt_nolazytime:
1624 sb->s_flags &= ~MS_LAZYTIME;
1625 return 1;
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001626 }
1627
Jan Kara5f3633e2013-02-02 23:09:36 -05001628 for (m = ext4_mount_opts; m->token != Opt_err; m++)
1629 if (token == m->token)
1630 break;
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001631
Jan Kara5f3633e2013-02-02 23:09:36 -05001632 if (m->token == Opt_err) {
1633 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1634 "or missing value", opt);
1635 return -1;
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001636 }
Jan Kara5f3633e2013-02-02 23:09:36 -05001637
Theodore Ts'o8dc0aa82013-02-02 23:38:39 -05001638 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1639 ext4_msg(sb, KERN_ERR,
1640 "Mount option \"%s\" incompatible with ext2", opt);
1641 return -1;
1642 }
1643 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1644 ext4_msg(sb, KERN_ERR,
1645 "Mount option \"%s\" incompatible with ext3", opt);
1646 return -1;
1647 }
1648
Eric Sandeenad4eec62013-08-28 19:05:07 -04001649 if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
Jan Kara5f3633e2013-02-02 23:09:36 -05001650 return -1;
1651 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1652 return -1;
Dmitry Monakhovc93cf2d2015-10-18 23:35:32 -04001653 if (m->flags & MOPT_EXPLICIT) {
1654 if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
1655 set_opt2(sb, EXPLICIT_DELALLOC);
Dmitry Monakhov1e381f62015-10-18 23:50:26 -04001656 } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
1657 set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM);
Dmitry Monakhovc93cf2d2015-10-18 23:35:32 -04001658 } else
1659 return -1;
1660 }
Jan Kara5f3633e2013-02-02 23:09:36 -05001661 if (m->flags & MOPT_CLEAR_ERR)
1662 clear_opt(sb, ERRORS_MASK);
1663 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1664 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1665 "options when quota turned on");
1666 return -1;
1667 }
1668
1669 if (m->flags & MOPT_NOSUPPORT) {
1670 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1671 } else if (token == Opt_commit) {
1672 if (arg == 0)
1673 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1674 sbi->s_commit_interval = HZ * arg;
1675 } else if (token == Opt_max_batch_time) {
Jan Kara5f3633e2013-02-02 23:09:36 -05001676 sbi->s_max_batch_time = arg;
1677 } else if (token == Opt_min_batch_time) {
1678 sbi->s_min_batch_time = arg;
1679 } else if (token == Opt_inode_readahead_blks) {
Jan Karae33e60e2013-02-02 23:14:31 -05001680 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
1681 ext4_msg(sb, KERN_ERR,
1682 "EXT4-fs: inode_readahead_blks must be "
1683 "0 or a power of 2 smaller than 2^31");
Jan Kara5f3633e2013-02-02 23:09:36 -05001684 return -1;
1685 }
1686 sbi->s_inode_readahead_blks = arg;
1687 } else if (token == Opt_init_itable) {
1688 set_opt(sb, INIT_INODE_TABLE);
1689 if (!args->from)
1690 arg = EXT4_DEF_LI_WAIT_MULT;
1691 sbi->s_li_wait_mult = arg;
1692 } else if (token == Opt_max_dir_size_kb) {
1693 sbi->s_max_dir_size_kb = arg;
1694 } else if (token == Opt_stripe) {
1695 sbi->s_stripe = arg;
1696 } else if (token == Opt_resuid) {
1697 uid = make_kuid(current_user_ns(), arg);
1698 if (!uid_valid(uid)) {
1699 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
1700 return -1;
1701 }
1702 sbi->s_resuid = uid;
1703 } else if (token == Opt_resgid) {
1704 gid = make_kgid(current_user_ns(), arg);
1705 if (!gid_valid(gid)) {
1706 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1707 return -1;
1708 }
1709 sbi->s_resgid = gid;
1710 } else if (token == Opt_journal_dev) {
1711 if (is_remount) {
1712 ext4_msg(sb, KERN_ERR,
1713 "Cannot specify journal on remount");
1714 return -1;
1715 }
1716 *journal_devnum = arg;
Eric Sandeenad4eec62013-08-28 19:05:07 -04001717 } else if (token == Opt_journal_path) {
1718 char *journal_path;
1719 struct inode *journal_inode;
1720 struct path path;
1721 int error;
1722
1723 if (is_remount) {
1724 ext4_msg(sb, KERN_ERR,
1725 "Cannot specify journal on remount");
1726 return -1;
1727 }
1728 journal_path = match_strdup(&args[0]);
1729 if (!journal_path) {
1730 ext4_msg(sb, KERN_ERR, "error: could not dup "
1731 "journal device string");
1732 return -1;
1733 }
1734
1735 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1736 if (error) {
1737 ext4_msg(sb, KERN_ERR, "error: could not find "
1738 "journal device path: error %d", error);
1739 kfree(journal_path);
1740 return -1;
1741 }
1742
David Howells2b0143b2015-03-17 22:25:59 +00001743 journal_inode = d_inode(path.dentry);
Eric Sandeenad4eec62013-08-28 19:05:07 -04001744 if (!S_ISBLK(journal_inode->i_mode)) {
1745 ext4_msg(sb, KERN_ERR, "error: journal path %s "
1746 "is not a block device", journal_path);
1747 path_put(&path);
1748 kfree(journal_path);
1749 return -1;
1750 }
1751
1752 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1753 path_put(&path);
1754 kfree(journal_path);
Jan Kara5f3633e2013-02-02 23:09:36 -05001755 } else if (token == Opt_journal_ioprio) {
1756 if (arg > 7) {
1757 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
1758 " (must be 0-7)");
1759 return -1;
1760 }
1761 *journal_ioprio =
1762 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
Theodore Ts'o6ddb2442015-04-16 01:56:00 -04001763 } else if (token == Opt_test_dummy_encryption) {
1764#ifdef CONFIG_EXT4_FS_ENCRYPTION
1765 sbi->s_mount_flags |= EXT4_MF_TEST_DUMMY_ENCRYPTION;
1766 ext4_msg(sb, KERN_WARNING,
1767 "Test dummy encryption mode enabled");
1768#else
1769 ext4_msg(sb, KERN_WARNING,
1770 "Test dummy encryption mount option ignored");
1771#endif
Jan Kara5f3633e2013-02-02 23:09:36 -05001772 } else if (m->flags & MOPT_DATAJ) {
1773 if (is_remount) {
1774 if (!sbi->s_journal)
1775 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1776 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
1777 ext4_msg(sb, KERN_ERR,
1778 "Cannot change data mode on remount");
1779 return -1;
1780 }
1781 } else {
1782 clear_opt(sb, DATA_FLAGS);
1783 sbi->s_mount_opt |= m->mount_opt;
1784 }
1785#ifdef CONFIG_QUOTA
1786 } else if (m->flags & MOPT_QFMT) {
1787 if (sb_any_quota_loaded(sb) &&
1788 sbi->s_jquota_fmt != m->mount_opt) {
1789 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
1790 "quota options when quota turned on");
1791 return -1;
1792 }
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04001793 if (ext4_has_feature_quota(sb)) {
Theodore Ts'oc325a672016-04-03 17:03:37 -04001794 ext4_msg(sb, KERN_INFO,
1795 "Quota format mount options ignored "
Jan Kara262b4662013-03-02 17:57:08 -05001796 "when QUOTA feature is enabled");
Theodore Ts'oc325a672016-04-03 17:03:37 -04001797 return 1;
Jan Kara262b4662013-03-02 17:57:08 -05001798 }
Jan Kara5f3633e2013-02-02 23:09:36 -05001799 sbi->s_jquota_fmt = m->mount_opt;
1800#endif
Ross Zwisler923ae0f2015-02-16 15:59:38 -08001801 } else if (token == Opt_dax) {
Dan Williamsef83b6e2015-09-29 15:48:11 -04001802#ifdef CONFIG_FS_DAX
1803 ext4_msg(sb, KERN_WARNING,
1804 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1805 sbi->s_mount_opt |= m->mount_opt;
1806#else
Ross Zwisler923ae0f2015-02-16 15:59:38 -08001807 ext4_msg(sb, KERN_INFO, "dax option not supported");
1808 return -1;
1809#endif
Ales Novak7915a862016-03-12 21:55:50 -05001810 } else if (token == Opt_data_err_abort) {
1811 sbi->s_mount_opt |= m->mount_opt;
1812 } else if (token == Opt_data_err_ignore) {
1813 sbi->s_mount_opt &= ~m->mount_opt;
Jan Kara5f3633e2013-02-02 23:09:36 -05001814 } else {
1815 if (!args->from)
1816 arg = 1;
1817 if (m->flags & MOPT_CLEAR)
1818 arg = !arg;
1819 else if (unlikely(!(m->flags & MOPT_SET))) {
1820 ext4_msg(sb, KERN_WARNING,
1821 "buggy handling of option %s", opt);
1822 WARN_ON(1);
1823 return -1;
1824 }
1825 if (arg != 0)
1826 sbi->s_mount_opt |= m->mount_opt;
1827 else
1828 sbi->s_mount_opt &= ~m->mount_opt;
1829 }
1830 return 1;
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001831}
1832
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001833static int parse_options(char *options, struct super_block *sb,
Theodore Ts'oc3191062009-01-06 11:14:25 -05001834 unsigned long *journal_devnum,
Theodore Ts'ob3881f72009-01-05 22:46:26 -05001835 unsigned int *journal_ioprio,
Eric Sandeen661aa522012-02-20 17:53:04 -05001836 int is_remount)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001837{
Mingming Cao617ba132006-10-11 01:20:53 -07001838 struct ext4_sb_info *sbi = EXT4_SB(sb);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001839 char *p;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001840 substring_t args[MAX_OPT_ARGS];
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001841 int token;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001842
1843 if (!options)
1844 return 1;
1845
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001846 while ((p = strsep(&options, ",")) != NULL) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001847 if (!*p)
1848 continue;
Eric Sandeen15121c12010-02-15 20:17:55 -05001849 /*
1850 * Initialize args struct so we know whether arg was
1851 * found; some options take optional arguments.
1852 */
Sachin Kamatcaecd0a2012-08-18 22:29:18 -04001853 args[0].to = args[0].from = NULL;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001854 token = match_token(p, tokens, args);
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001855 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1856 journal_ioprio, is_remount) < 0)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001857 return 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001858 }
1859#ifdef CONFIG_QUOTA
Jan Kara49da9392016-09-05 23:08:16 -04001860 /*
1861 * We do the test below only for project quotas. 'usrquota' and
1862 * 'grpquota' mount options are allowed even without quota feature
1863 * to support legacy quotas in quota files.
1864 */
1865 if (test_opt(sb, PRJQUOTA) && !ext4_has_feature_project(sb)) {
1866 ext4_msg(sb, KERN_ERR, "Project quota feature not enabled. "
1867 "Cannot enable project quota enforcement.");
1868 return 0;
1869 }
1870 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
Dmitry Monakhov482a7422010-02-24 11:35:32 -05001871 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05001872 clear_opt(sb, USRQUOTA);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001873
Dmitry Monakhov482a7422010-02-24 11:35:32 -05001874 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05001875 clear_opt(sb, GRPQUOTA);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001876
Dmitry Monakhov56c50f12010-03-01 23:28:41 -05001877 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04001878 ext4_msg(sb, KERN_ERR, "old and new quota "
1879 "format mixing");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001880 return 0;
1881 }
1882
1883 if (!sbi->s_jquota_fmt) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04001884 ext4_msg(sb, KERN_ERR, "journaled quota format "
1885 "not specified");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001886 return 0;
1887 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001888 }
1889#endif
Jan Kara261cb20c2012-12-20 00:07:18 -05001890 if (test_opt(sb, DIOREAD_NOLOCK)) {
1891 int blocksize =
1892 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
1893
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +03001894 if (blocksize < PAGE_SIZE) {
Jan Kara261cb20c2012-12-20 00:07:18 -05001895 ext4_msg(sb, KERN_ERR, "can't mount with "
1896 "dioread_nolock if block size != PAGE_SIZE");
1897 return 0;
1898 }
1899 }
Jan Karad4f76102014-11-25 20:19:17 -05001900 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
1901 test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
1902 ext4_msg(sb, KERN_ERR, "can't mount with journal_async_commit "
1903 "in data=ordered mode");
1904 return 0;
1905 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001906 return 1;
1907}
1908
Theodore Ts'o2adf6da2012-03-03 23:20:50 -05001909static inline void ext4_show_quota_options(struct seq_file *seq,
1910 struct super_block *sb)
1911{
1912#if defined(CONFIG_QUOTA)
1913 struct ext4_sb_info *sbi = EXT4_SB(sb);
1914
1915 if (sbi->s_jquota_fmt) {
1916 char *fmtname = "";
1917
1918 switch (sbi->s_jquota_fmt) {
1919 case QFMT_VFS_OLD:
1920 fmtname = "vfsold";
1921 break;
1922 case QFMT_VFS_V0:
1923 fmtname = "vfsv0";
1924 break;
1925 case QFMT_VFS_V1:
1926 fmtname = "vfsv1";
1927 break;
1928 }
1929 seq_printf(seq, ",jqfmt=%s", fmtname);
1930 }
1931
1932 if (sbi->s_qf_names[USRQUOTA])
Kees Cooka068acf2015-09-04 15:44:57 -07001933 seq_show_option(seq, "usrjquota", sbi->s_qf_names[USRQUOTA]);
Theodore Ts'o2adf6da2012-03-03 23:20:50 -05001934
1935 if (sbi->s_qf_names[GRPQUOTA])
Kees Cooka068acf2015-09-04 15:44:57 -07001936 seq_show_option(seq, "grpjquota", sbi->s_qf_names[GRPQUOTA]);
Theodore Ts'o2adf6da2012-03-03 23:20:50 -05001937#endif
1938}
1939
Theodore Ts'o5a916be2012-03-04 19:27:31 -05001940static const char *token2str(int token)
1941{
Herton Ronaldo Krzesinski50df9fd2012-09-23 22:49:12 -04001942 const struct match_token *t;
Theodore Ts'o5a916be2012-03-04 19:27:31 -05001943
1944 for (t = tokens; t->token != Opt_err; t++)
1945 if (t->token == token && !strchr(t->pattern, '='))
1946 break;
1947 return t->pattern;
1948}
1949
Theodore Ts'o2adf6da2012-03-03 23:20:50 -05001950/*
1951 * Show an option if
1952 * - it's set to a non-default value OR
1953 * - if the per-sb default is different from the global default
1954 */
Theodore Ts'o66acdcf2012-03-04 20:21:38 -05001955static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1956 int nodefs)
Theodore Ts'o2adf6da2012-03-03 23:20:50 -05001957{
Theodore Ts'o2adf6da2012-03-03 23:20:50 -05001958 struct ext4_sb_info *sbi = EXT4_SB(sb);
1959 struct ext4_super_block *es = sbi->s_es;
Theodore Ts'o66acdcf2012-03-04 20:21:38 -05001960 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
Theodore Ts'o5a916be2012-03-04 19:27:31 -05001961 const struct mount_opts *m;
Theodore Ts'o66acdcf2012-03-04 20:21:38 -05001962 char sep = nodefs ? '\n' : ',';
Theodore Ts'o2adf6da2012-03-03 23:20:50 -05001963
Theodore Ts'o66acdcf2012-03-04 20:21:38 -05001964#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1965#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
Theodore Ts'o2adf6da2012-03-03 23:20:50 -05001966
1967 if (sbi->s_sb_block != 1)
Theodore Ts'o5a916be2012-03-04 19:27:31 -05001968 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1969
1970 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1971 int want_set = m->flags & MOPT_SET;
1972 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1973 (m->flags & MOPT_CLEAR_ERR))
1974 continue;
Theodore Ts'o66acdcf2012-03-04 20:21:38 -05001975 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
Theodore Ts'o5a916be2012-03-04 19:27:31 -05001976 continue; /* skip if same as the default */
1977 if ((want_set &&
1978 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1979 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1980 continue; /* select Opt_noFoo vs Opt_Foo */
1981 SEQ_OPTS_PRINT("%s", token2str(m->token));
1982 }
1983
Eric W. Biederman08cefc72012-02-07 15:41:49 -08001984 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
Theodore Ts'o5a916be2012-03-04 19:27:31 -05001985 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
Eric W. Biederman08cefc72012-02-07 15:41:49 -08001986 SEQ_OPTS_PRINT("resuid=%u",
1987 from_kuid_munged(&init_user_ns, sbi->s_resuid));
1988 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
Theodore Ts'o5a916be2012-03-04 19:27:31 -05001989 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
Eric W. Biederman08cefc72012-02-07 15:41:49 -08001990 SEQ_OPTS_PRINT("resgid=%u",
1991 from_kgid_munged(&init_user_ns, sbi->s_resgid));
Theodore Ts'o66acdcf2012-03-04 20:21:38 -05001992 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
Theodore Ts'o5a916be2012-03-04 19:27:31 -05001993 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
1994 SEQ_OPTS_PUTS("errors=remount-ro");
Theodore Ts'o2adf6da2012-03-03 23:20:50 -05001995 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
Theodore Ts'o5a916be2012-03-04 19:27:31 -05001996 SEQ_OPTS_PUTS("errors=continue");
Theodore Ts'o2adf6da2012-03-03 23:20:50 -05001997 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
Theodore Ts'o5a916be2012-03-04 19:27:31 -05001998 SEQ_OPTS_PUTS("errors=panic");
Theodore Ts'o66acdcf2012-03-04 20:21:38 -05001999 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
Theodore Ts'o5a916be2012-03-04 19:27:31 -05002000 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
Theodore Ts'o66acdcf2012-03-04 20:21:38 -05002001 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
Theodore Ts'o5a916be2012-03-04 19:27:31 -05002002 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
Theodore Ts'o66acdcf2012-03-04 20:21:38 -05002003 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
Theodore Ts'o5a916be2012-03-04 19:27:31 -05002004 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
Theodore Ts'o2adf6da2012-03-03 23:20:50 -05002005 if (sb->s_flags & MS_I_VERSION)
Theodore Ts'o5a916be2012-03-04 19:27:31 -05002006 SEQ_OPTS_PUTS("i_version");
Theodore Ts'o66acdcf2012-03-04 20:21:38 -05002007 if (nodefs || sbi->s_stripe)
Theodore Ts'o5a916be2012-03-04 19:27:31 -05002008 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
Theodore Ts'o66acdcf2012-03-04 20:21:38 -05002009 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
Theodore Ts'o5a916be2012-03-04 19:27:31 -05002010 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
2011 SEQ_OPTS_PUTS("data=journal");
2012 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
2013 SEQ_OPTS_PUTS("data=ordered");
2014 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
2015 SEQ_OPTS_PUTS("data=writeback");
2016 }
Theodore Ts'o66acdcf2012-03-04 20:21:38 -05002017 if (nodefs ||
2018 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
Theodore Ts'o5a916be2012-03-04 19:27:31 -05002019 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
2020 sbi->s_inode_readahead_blks);
Theodore Ts'o2adf6da2012-03-03 23:20:50 -05002021
Theodore Ts'o66acdcf2012-03-04 20:21:38 -05002022 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
2023 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
Theodore Ts'o5a916be2012-03-04 19:27:31 -05002024 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
Theodore Ts'odf981d02012-08-17 09:48:17 -04002025 if (nodefs || sbi->s_max_dir_size_kb)
2026 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
Ales Novak7915a862016-03-12 21:55:50 -05002027 if (test_opt(sb, DATA_ERR_ABORT))
2028 SEQ_OPTS_PUTS("data_err=abort");
Eric Biggers797488a2018-09-15 14:28:26 -04002029 if (DUMMY_ENCRYPTION_ENABLED(sbi))
2030 SEQ_OPTS_PUTS("test_dummy_encryption");
Theodore Ts'o2adf6da2012-03-03 23:20:50 -05002031
2032 ext4_show_quota_options(seq, sb);
Theodore Ts'o2adf6da2012-03-03 23:20:50 -05002033 return 0;
2034}
2035
Theodore Ts'o66acdcf2012-03-04 20:21:38 -05002036static int ext4_show_options(struct seq_file *seq, struct dentry *root)
2037{
2038 return _ext4_show_options(seq, root->d_sb, 0);
2039}
2040
Theodore Ts'oebd173b2015-09-23 12:46:17 -04002041int ext4_seq_options_show(struct seq_file *seq, void *offset)
Theodore Ts'o66acdcf2012-03-04 20:21:38 -05002042{
2043 struct super_block *sb = seq->private;
2044 int rc;
2045
2046 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
2047 rc = _ext4_show_options(seq, sb, 1);
2048 seq_puts(seq, "\n");
2049 return rc;
2050}
2051
Mingming Cao617ba132006-10-11 01:20:53 -07002052static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002053 int read_only)
2054{
Mingming Cao617ba132006-10-11 01:20:53 -07002055 struct ext4_sb_info *sbi = EXT4_SB(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002056 int res = 0;
2057
Mingming Cao617ba132006-10-11 01:20:53 -07002058 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04002059 ext4_msg(sb, KERN_ERR, "revision level too high, "
2060 "forcing read-only mode");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002061 res = MS_RDONLY;
2062 }
2063 if (read_only)
Theodore Ts'o281b5992011-09-09 18:34:51 -04002064 goto done;
Mingming Cao617ba132006-10-11 01:20:53 -07002065 if (!(sbi->s_mount_state & EXT4_VALID_FS))
Eric Sandeenb31e1552009-06-04 17:36:36 -04002066 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
2067 "running e2fsck is recommended");
Lukas Czernerc8b459f2014-05-12 12:55:07 -04002068 else if (sbi->s_mount_state & EXT4_ERROR_FS)
Eric Sandeenb31e1552009-06-04 17:36:36 -04002069 ext4_msg(sb, KERN_WARNING,
2070 "warning: mounting fs with errors, "
2071 "running e2fsck is recommended");
Tao Maed3ce802011-05-18 13:29:57 -04002072 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002073 le16_to_cpu(es->s_mnt_count) >=
2074 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
Eric Sandeenb31e1552009-06-04 17:36:36 -04002075 ext4_msg(sb, KERN_WARNING,
2076 "warning: maximal mount count reached, "
2077 "running e2fsck is recommended");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002078 else if (le32_to_cpu(es->s_checkinterval) &&
2079 (le32_to_cpu(es->s_lastcheck) +
2080 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
Eric Sandeenb31e1552009-06-04 17:36:36 -04002081 ext4_msg(sb, KERN_WARNING,
2082 "warning: checktime reached, "
2083 "running e2fsck is recommended");
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04002084 if (!sbi->s_journal)
Frank Mayhar03901312009-01-07 00:06:22 -05002085 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002086 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
Mingming Cao617ba132006-10-11 01:20:53 -07002087 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
Marcin Slusarze8546d02008-04-17 10:38:59 -04002088 le16_add_cpu(&es->s_mnt_count, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002089 es->s_mtime = cpu_to_le32(get_seconds());
Mingming Cao617ba132006-10-11 01:20:53 -07002090 ext4_update_dynamic_rev(sb);
Frank Mayhar03901312009-01-07 00:06:22 -05002091 if (sbi->s_journal)
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04002092 ext4_set_feature_journal_needs_recovery(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002093
Theodore Ts'oe2d67052009-05-01 00:33:44 -04002094 ext4_commit_super(sb, 1);
Theodore Ts'o281b5992011-09-09 18:34:51 -04002095done:
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002096 if (test_opt(sb, DEBUG))
Theodore Ts'oa9df9a42009-01-05 22:18:16 -05002097 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
Theodore Ts'oa2595b82010-12-15 20:30:48 -05002098 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002099 sb->s_blocksize,
2100 sbi->s_groups_count,
Mingming Cao617ba132006-10-11 01:20:53 -07002101 EXT4_BLOCKS_PER_GROUP(sb),
2102 EXT4_INODES_PER_GROUP(sb),
Theodore Ts'oa2595b82010-12-15 20:30:48 -05002103 sbi->s_mount_opt, sbi->s_mount_opt2);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002104
Dan Magenheimer7abc52c2011-05-26 10:02:03 -06002105 cleancache_init_fs(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002106 return res;
2107}
2108
Theodore Ts'o117fff12012-09-05 01:29:50 -04002109int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
2110{
2111 struct ext4_sb_info *sbi = EXT4_SB(sb);
2112 struct flex_groups *new_groups;
2113 int size;
2114
2115 if (!sbi->s_log_groups_per_flex)
2116 return 0;
2117
2118 size = ext4_flex_group(sbi, ngroup - 1) + 1;
2119 if (size <= sbi->s_flex_groups_allocated)
2120 return 0;
2121
2122 size = roundup_pow_of_two(size * sizeof(struct flex_groups));
2123 new_groups = ext4_kvzalloc(size, GFP_KERNEL);
2124 if (!new_groups) {
2125 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
2126 size / (int) sizeof(struct flex_groups));
2127 return -ENOMEM;
2128 }
2129
2130 if (sbi->s_flex_groups) {
2131 memcpy(new_groups, sbi->s_flex_groups,
2132 (sbi->s_flex_groups_allocated *
2133 sizeof(struct flex_groups)));
Al Virob93b41d2014-11-20 12:19:11 -05002134 kvfree(sbi->s_flex_groups);
Theodore Ts'o117fff12012-09-05 01:29:50 -04002135 }
2136 sbi->s_flex_groups = new_groups;
2137 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
2138 return 0;
2139}
2140
Jose R. Santos772cb7c2008-07-11 19:27:31 -04002141static int ext4_fill_flex_info(struct super_block *sb)
2142{
2143 struct ext4_sb_info *sbi = EXT4_SB(sb);
2144 struct ext4_group_desc *gdp = NULL;
Jose R. Santos772cb7c2008-07-11 19:27:31 -04002145 ext4_group_t flex_group;
Theodore Ts'o117fff12012-09-05 01:29:50 -04002146 int i, err;
Jose R. Santos772cb7c2008-07-11 19:27:31 -04002147
Theodore Ts'o503358a2009-11-23 07:24:46 -05002148 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
Xi Wangd50f2ab2012-01-10 11:51:10 -05002149 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
Jose R. Santos772cb7c2008-07-11 19:27:31 -04002150 sbi->s_log_groups_per_flex = 0;
2151 return 1;
2152 }
2153
Theodore Ts'o117fff12012-09-05 01:29:50 -04002154 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
2155 if (err)
Theodore Ts'o9933fc02011-08-01 08:45:02 -04002156 goto failed;
Jose R. Santos772cb7c2008-07-11 19:27:31 -04002157
Jose R. Santos772cb7c2008-07-11 19:27:31 -04002158 for (i = 0; i < sbi->s_groups_count; i++) {
Theodore Ts'o88b6edd2009-05-25 11:50:39 -04002159 gdp = ext4_get_group_desc(sb, i, NULL);
Jose R. Santos772cb7c2008-07-11 19:27:31 -04002160
2161 flex_group = ext4_flex_group(sbi, i);
Theodore Ts'o7ad9bb62009-09-11 16:51:28 -04002162 atomic_add(ext4_free_inodes_count(sb, gdp),
2163 &sbi->s_flex_groups[flex_group].free_inodes);
Theodore Ts'o90ba9832013-03-11 23:39:59 -04002164 atomic64_add(ext4_free_group_clusters(sb, gdp),
2165 &sbi->s_flex_groups[flex_group].free_clusters);
Theodore Ts'o7ad9bb62009-09-11 16:51:28 -04002166 atomic_add(ext4_used_dirs_count(sb, gdp),
2167 &sbi->s_flex_groups[flex_group].used_dirs);
Jose R. Santos772cb7c2008-07-11 19:27:31 -04002168 }
2169
2170 return 1;
2171failed:
2172 return 0;
2173}
2174
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04002175static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04002176 struct ext4_group_desc *gdp)
Andreas Dilger717d50e2007-10-16 18:38:25 -04002177{
Daeho Jeongb47820e2016-07-03 17:51:39 -04002178 int offset = offsetof(struct ext4_group_desc, bg_checksum);
Andreas Dilger717d50e2007-10-16 18:38:25 -04002179 __u16 crc = 0;
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04002180 __le32 le_group = cpu_to_le32(block_group);
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04002181 struct ext4_sb_info *sbi = EXT4_SB(sb);
Andreas Dilger717d50e2007-10-16 18:38:25 -04002182
Dmitry Monakhov9aa5d322014-10-13 03:36:16 -04002183 if (ext4_has_metadata_csum(sbi->s_sb)) {
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04002184 /* Use new metadata_csum algorithm */
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04002185 __u32 csum32;
Daeho Jeongb47820e2016-07-03 17:51:39 -04002186 __u16 dummy_csum = 0;
Andreas Dilger717d50e2007-10-16 18:38:25 -04002187
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04002188 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2189 sizeof(le_group));
Daeho Jeongb47820e2016-07-03 17:51:39 -04002190 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, offset);
2191 csum32 = ext4_chksum(sbi, csum32, (__u8 *)&dummy_csum,
2192 sizeof(dummy_csum));
2193 offset += sizeof(dummy_csum);
2194 if (offset < sbi->s_desc_size)
2195 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp + offset,
2196 sbi->s_desc_size - offset);
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04002197
2198 crc = csum32 & 0xFFFF;
2199 goto out;
Andreas Dilger717d50e2007-10-16 18:38:25 -04002200 }
2201
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04002202 /* old crc16 code */
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04002203 if (!ext4_has_feature_gdt_csum(sb))
Darrick J. Wong813d32f2014-10-14 02:35:49 -04002204 return 0;
2205
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04002206 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2207 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2208 crc = crc16(crc, (__u8 *)gdp, offset);
2209 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2210 /* for checksum of struct ext4_group_desc do the rest...*/
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04002211 if (ext4_has_feature_64bit(sb) &&
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04002212 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2213 crc = crc16(crc, (__u8 *)gdp + offset,
2214 le16_to_cpu(sbi->s_es->s_desc_size) -
2215 offset);
2216
2217out:
Andreas Dilger717d50e2007-10-16 18:38:25 -04002218 return cpu_to_le16(crc);
2219}
2220
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04002221int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
Andreas Dilger717d50e2007-10-16 18:38:25 -04002222 struct ext4_group_desc *gdp)
2223{
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04002224 if (ext4_has_group_desc_csum(sb) &&
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04002225 (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
Andreas Dilger717d50e2007-10-16 18:38:25 -04002226 return 0;
2227
2228 return 1;
2229}
2230
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04002231void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2232 struct ext4_group_desc *gdp)
2233{
2234 if (!ext4_has_group_desc_csum(sb))
2235 return;
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04002236 gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04002237}
2238
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002239/* Called at mount-time, super-block is locked */
Lukas Czernerbfff6872010-10-27 21:30:05 -04002240static int ext4_check_descriptors(struct super_block *sb,
Theodore Ts'o829fa702016-08-01 00:51:02 -04002241 ext4_fsblk_t sb_block,
Lukas Czernerbfff6872010-10-27 21:30:05 -04002242 ext4_group_t *first_not_zeroed)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002243{
Mingming Cao617ba132006-10-11 01:20:53 -07002244 struct ext4_sb_info *sbi = EXT4_SB(sb);
2245 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2246 ext4_fsblk_t last_block;
Theodore Ts'o9bf8d5b2018-07-08 19:35:02 -04002247 ext4_fsblk_t last_bg_block = sb_block + ext4_bg_num_gdb(sb, 0);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002248 ext4_fsblk_t block_bitmap;
2249 ext4_fsblk_t inode_bitmap;
2250 ext4_fsblk_t inode_table;
Jose R. Santosce421582007-10-16 18:38:25 -04002251 int flexbg_flag = 0;
Lukas Czernerbfff6872010-10-27 21:30:05 -04002252 ext4_group_t i, grp = sbi->s_groups_count;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002253
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04002254 if (ext4_has_feature_flex_bg(sb))
Jose R. Santosce421582007-10-16 18:38:25 -04002255 flexbg_flag = 1;
2256
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002257 ext4_debug("Checking group descriptors");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002258
Akinobu Mita197cd65a2008-02-06 01:40:16 -08002259 for (i = 0; i < sbi->s_groups_count; i++) {
2260 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2261
Jose R. Santosce421582007-10-16 18:38:25 -04002262 if (i == sbi->s_groups_count - 1 || flexbg_flag)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002263 last_block = ext4_blocks_count(sbi->s_es) - 1;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002264 else
2265 last_block = first_block +
Mingming Cao617ba132006-10-11 01:20:53 -07002266 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002267
Lukas Czernerbfff6872010-10-27 21:30:05 -04002268 if ((grp == sbi->s_groups_count) &&
2269 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2270 grp = i;
2271
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07002272 block_bitmap = ext4_block_bitmap(sb, gdp);
Theodore Ts'o829fa702016-08-01 00:51:02 -04002273 if (block_bitmap == sb_block) {
2274 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2275 "Block bitmap for group %u overlaps "
2276 "superblock", i);
Theodore Ts'o68e35792018-03-29 22:10:35 -04002277 if (!(sb->s_flags & MS_RDONLY))
2278 return 0;
Theodore Ts'o829fa702016-08-01 00:51:02 -04002279 }
Theodore Ts'o9e4842f2018-06-13 23:08:26 -04002280 if (block_bitmap >= sb_block + 1 &&
2281 block_bitmap <= last_bg_block) {
2282 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2283 "Block bitmap for group %u overlaps "
2284 "block group descriptors", i);
2285 if (!(sb->s_flags & MS_RDONLY))
2286 return 0;
2287 }
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002288 if (block_bitmap < first_block || block_bitmap > last_block) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04002289 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
Theodore Ts'oa9df9a42009-01-05 22:18:16 -05002290 "Block bitmap for group %u not in group "
Eric Sandeenb31e1552009-06-04 17:36:36 -04002291 "(block %llu)!", i, block_bitmap);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002292 return 0;
2293 }
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07002294 inode_bitmap = ext4_inode_bitmap(sb, gdp);
Theodore Ts'o829fa702016-08-01 00:51:02 -04002295 if (inode_bitmap == sb_block) {
2296 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2297 "Inode bitmap for group %u overlaps "
2298 "superblock", i);
Theodore Ts'o68e35792018-03-29 22:10:35 -04002299 if (!(sb->s_flags & MS_RDONLY))
2300 return 0;
Theodore Ts'o829fa702016-08-01 00:51:02 -04002301 }
Theodore Ts'o9e4842f2018-06-13 23:08:26 -04002302 if (inode_bitmap >= sb_block + 1 &&
2303 inode_bitmap <= last_bg_block) {
2304 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2305 "Inode bitmap for group %u overlaps "
2306 "block group descriptors", i);
2307 if (!(sb->s_flags & MS_RDONLY))
2308 return 0;
2309 }
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002310 if (inode_bitmap < first_block || inode_bitmap > last_block) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04002311 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
Theodore Ts'oa9df9a42009-01-05 22:18:16 -05002312 "Inode bitmap for group %u not in group "
Eric Sandeenb31e1552009-06-04 17:36:36 -04002313 "(block %llu)!", i, inode_bitmap);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002314 return 0;
2315 }
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07002316 inode_table = ext4_inode_table(sb, gdp);
Theodore Ts'o829fa702016-08-01 00:51:02 -04002317 if (inode_table == sb_block) {
2318 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2319 "Inode table for group %u overlaps "
2320 "superblock", i);
Theodore Ts'o68e35792018-03-29 22:10:35 -04002321 if (!(sb->s_flags & MS_RDONLY))
2322 return 0;
Theodore Ts'o829fa702016-08-01 00:51:02 -04002323 }
Theodore Ts'o9e4842f2018-06-13 23:08:26 -04002324 if (inode_table >= sb_block + 1 &&
2325 inode_table <= last_bg_block) {
2326 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2327 "Inode table for group %u overlaps "
2328 "block group descriptors", i);
2329 if (!(sb->s_flags & MS_RDONLY))
2330 return 0;
2331 }
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002332 if (inode_table < first_block ||
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002333 inode_table + sbi->s_itb_per_group - 1 > last_block) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04002334 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
Theodore Ts'oa9df9a42009-01-05 22:18:16 -05002335 "Inode table for group %u not in group "
Eric Sandeenb31e1552009-06-04 17:36:36 -04002336 "(block %llu)!", i, inode_table);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002337 return 0;
2338 }
Aneesh Kumar K.V955ce5f2009-05-02 20:35:09 -04002339 ext4_lock_group(sb, i);
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04002340 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04002341 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2342 "Checksum for group %u failed (%u!=%u)",
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04002343 i, le16_to_cpu(ext4_group_desc_csum(sb, i,
Eric Sandeenb31e1552009-06-04 17:36:36 -04002344 gdp)), le16_to_cpu(gdp->bg_checksum));
Li Zefan7ee1ec42008-09-08 10:47:19 -04002345 if (!(sb->s_flags & MS_RDONLY)) {
Aneesh Kumar K.V955ce5f2009-05-02 20:35:09 -04002346 ext4_unlock_group(sb, i);
Theodore Ts'o8a266462008-07-26 14:34:21 -04002347 return 0;
Li Zefan7ee1ec42008-09-08 10:47:19 -04002348 }
Andreas Dilger717d50e2007-10-16 18:38:25 -04002349 }
Aneesh Kumar K.V955ce5f2009-05-02 20:35:09 -04002350 ext4_unlock_group(sb, i);
Jose R. Santosce421582007-10-16 18:38:25 -04002351 if (!flexbg_flag)
2352 first_block += EXT4_BLOCKS_PER_GROUP(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002353 }
Lukas Czernerbfff6872010-10-27 21:30:05 -04002354 if (NULL != first_not_zeroed)
2355 *first_not_zeroed = grp;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002356 return 1;
2357}
2358
Mingming Cao617ba132006-10-11 01:20:53 -07002359/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002360 * the superblock) which were deleted from all directories, but held open by
2361 * a process at the time of a crash. We walk the list and try to delete these
2362 * inodes at recovery time (only with a read-write filesystem).
2363 *
2364 * In order to keep the orphan inode chain consistent during traversal (in
2365 * case of crash during recovery), we link each inode into the superblock
2366 * orphan list_head and handle it the same way as an inode deletion during
2367 * normal operation (which journals the operations for us).
2368 *
2369 * We only do an iget() and an iput() on each inode, which is very safe if we
2370 * accidentally point at an in-use or already deleted inode. The worst that
2371 * can happen in this case is that we get a "bit already cleared" message from
Mingming Cao617ba132006-10-11 01:20:53 -07002372 * ext4_free_inode(). The only reason we would point at a wrong inode is if
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002373 * e2fsck was run on this filesystem, and it must have already done the orphan
2374 * inode cleanup for us, so we can safely abort without any further action.
2375 */
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002376static void ext4_orphan_cleanup(struct super_block *sb,
2377 struct ext4_super_block *es)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002378{
2379 unsigned int s_flags = sb->s_flags;
2380 int nr_orphans = 0, nr_truncates = 0;
2381#ifdef CONFIG_QUOTA
zhangyi (F)3806cea2017-08-24 15:21:50 -04002382 int quota_update = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002383 int i;
2384#endif
2385 if (!es->s_last_orphan) {
2386 jbd_debug(4, "no orphan inodes to clean up\n");
2387 return;
2388 }
2389
Eric Sandeena8f48a92006-12-06 20:40:13 -08002390 if (bdev_read_only(sb->s_bdev)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04002391 ext4_msg(sb, KERN_ERR, "write access "
2392 "unavailable, skipping orphan cleanup");
Eric Sandeena8f48a92006-12-06 20:40:13 -08002393 return;
2394 }
2395
Amir Goldsteind39195c2011-02-28 00:53:45 -05002396 /* Check if feature set would not allow a r/w mount */
2397 if (!ext4_feature_set_ok(sb, 0)) {
2398 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2399 "unknown ROCOMPAT features");
2400 return;
2401 }
2402
Mingming Cao617ba132006-10-11 01:20:53 -07002403 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
Eric Sandeenc25f9bc2012-09-26 23:30:12 -04002404 /* don't clear list on RO mount w/ errors */
2405 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
Dmitry Monakhov84474972014-09-16 14:52:03 -04002406 ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002407 "clearing orphan list.\n");
Eric Sandeenc25f9bc2012-09-26 23:30:12 -04002408 es->s_last_orphan = 0;
2409 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002410 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2411 return;
2412 }
2413
2414 if (s_flags & MS_RDONLY) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04002415 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002416 sb->s_flags &= ~MS_RDONLY;
2417 }
2418#ifdef CONFIG_QUOTA
2419 /* Needed for iput() to work correctly and not trash data */
2420 sb->s_flags |= MS_ACTIVE;
zhangyi (F)3806cea2017-08-24 15:21:50 -04002421
2422 /*
2423 * Turn on quotas which were not enabled for read-only mounts if
2424 * filesystem has quota feature, so that they are updated correctly.
2425 */
2426 if (ext4_has_feature_quota(sb) && (s_flags & MS_RDONLY)) {
2427 int ret = ext4_enable_quotas(sb);
2428
2429 if (!ret)
2430 quota_update = 1;
2431 else
2432 ext4_msg(sb, KERN_ERR,
2433 "Cannot turn on quotas: error %d", ret);
2434 }
2435
2436 /* Turn on journaled quotas used for old sytle */
Jan Karaa2d4a642014-09-11 11:15:15 -04002437 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
Mingming Cao617ba132006-10-11 01:20:53 -07002438 if (EXT4_SB(sb)->s_qf_names[i]) {
2439 int ret = ext4_quota_on_mount(sb, i);
zhangyi (F)3806cea2017-08-24 15:21:50 -04002440
2441 if (!ret)
2442 quota_update = 1;
2443 else
Eric Sandeenb31e1552009-06-04 17:36:36 -04002444 ext4_msg(sb, KERN_ERR,
2445 "Cannot turn on journaled "
zhangyi (F)3806cea2017-08-24 15:21:50 -04002446 "quota: type %d: error %d", i, ret);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002447 }
2448 }
2449#endif
2450
2451 while (es->s_last_orphan) {
2452 struct inode *inode;
2453
Vegard Nossumc65d5c62016-07-14 23:21:35 -04002454 /*
2455 * We may have encountered an error during cleanup; if
2456 * so, skip the rest.
2457 */
2458 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2459 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2460 es->s_last_orphan = 0;
2461 break;
2462 }
2463
Josef Bacik97bd42b2008-04-29 22:04:56 -04002464 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2465 if (IS_ERR(inode)) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002466 es->s_last_orphan = 0;
2467 break;
2468 }
2469
Mingming Cao617ba132006-10-11 01:20:53 -07002470 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
Christoph Hellwig871a2932010-03-03 09:05:07 -05002471 dquot_initialize(inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002472 if (inode->i_nlink) {
Paul Taysom566370a2013-05-28 07:51:21 -04002473 if (test_opt(sb, DEBUG))
2474 ext4_msg(sb, KERN_DEBUG,
2475 "%s: truncating inode %lu to %lld bytes",
2476 __func__, inode->i_ino, inode->i_size);
Theodore Ts'oe5f8eab82008-09-08 22:25:04 -04002477 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002478 inode->i_ino, inode->i_size);
Al Viro59551022016-01-22 15:40:57 -05002479 inode_lock(inode);
Lukas Czerner55f252c2013-05-27 23:32:35 -04002480 truncate_inode_pages(inode->i_mapping, inode->i_size);
Mingming Cao617ba132006-10-11 01:20:53 -07002481 ext4_truncate(inode);
Al Viro59551022016-01-22 15:40:57 -05002482 inode_unlock(inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002483 nr_truncates++;
2484 } else {
Paul Taysom566370a2013-05-28 07:51:21 -04002485 if (test_opt(sb, DEBUG))
2486 ext4_msg(sb, KERN_DEBUG,
2487 "%s: deleting unreferenced inode %lu",
2488 __func__, inode->i_ino);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002489 jbd_debug(2, "deleting unreferenced inode %lu\n",
2490 inode->i_ino);
2491 nr_orphans++;
2492 }
2493 iput(inode); /* The delete magic happens here! */
2494 }
2495
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002496#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002497
2498 if (nr_orphans)
Eric Sandeenb31e1552009-06-04 17:36:36 -04002499 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2500 PLURAL(nr_orphans));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002501 if (nr_truncates)
Eric Sandeenb31e1552009-06-04 17:36:36 -04002502 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2503 PLURAL(nr_truncates));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002504#ifdef CONFIG_QUOTA
zhangyi (F)3806cea2017-08-24 15:21:50 -04002505 /* Turn off quotas if they were enabled for orphan cleanup */
2506 if (quota_update) {
2507 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2508 if (sb_dqopt(sb)->files[i])
2509 dquot_quota_off(sb, i);
2510 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002511 }
2512#endif
2513 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2514}
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04002515
Eric Sandeencd2291a2008-01-28 23:58:27 -05002516/*
2517 * Maximal extent format file size.
2518 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2519 * extent format containers, within a sector_t, and within i_blocks
2520 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2521 * so that won't be a limiting factor.
2522 *
Lukas Czernerf17722f2011-06-06 00:05:17 -04002523 * However there is other limiting factor. We do store extents in the form
2524 * of starting block and length, hence the resulting length of the extent
2525 * covering maximum file size must fit into on-disk format containers as
2526 * well. Given that length is always by 1 unit bigger than max unit (because
2527 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2528 *
Eric Sandeencd2291a2008-01-28 23:58:27 -05002529 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2530 */
Theodore Ts'of287a1a2008-10-16 22:50:48 -04002531static loff_t ext4_max_size(int blkbits, int has_huge_files)
Eric Sandeencd2291a2008-01-28 23:58:27 -05002532{
2533 loff_t res;
2534 loff_t upper_limit = MAX_LFS_FILESIZE;
2535
2536 /* small i_blocks in vfs inode? */
Theodore Ts'of287a1a2008-10-16 22:50:48 -04002537 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
Eric Sandeencd2291a2008-01-28 23:58:27 -05002538 /*
Bartlomiej Zolnierkiewicz90c699a2009-06-19 08:08:50 +02002539 * CONFIG_LBDAF is not enabled implies the inode
Eric Sandeencd2291a2008-01-28 23:58:27 -05002540 * i_block represent total blocks in 512 bytes
2541 * 32 == size of vfs inode i_blocks * 8
2542 */
2543 upper_limit = (1LL << 32) - 1;
2544
2545 /* total blocks in file system block size */
2546 upper_limit >>= (blkbits - 9);
2547 upper_limit <<= blkbits;
2548 }
2549
Lukas Czernerf17722f2011-06-06 00:05:17 -04002550 /*
2551 * 32-bit extent-start container, ee_block. We lower the maxbytes
2552 * by one fs block, so ee_len can cover the extent of maximum file
2553 * size
2554 */
2555 res = (1LL << 32) - 1;
Eric Sandeencd2291a2008-01-28 23:58:27 -05002556 res <<= blkbits;
Eric Sandeencd2291a2008-01-28 23:58:27 -05002557
2558 /* Sanity check against vm- & vfs- imposed limits */
2559 if (res > upper_limit)
2560 res = upper_limit;
2561
2562 return res;
2563}
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002564
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002565/*
Eric Sandeencd2291a2008-01-28 23:58:27 -05002566 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05002567 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2568 * We need to be 1 filesystem block less than the 2^48 sector limit.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002569 */
Theodore Ts'of287a1a2008-10-16 22:50:48 -04002570static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002571{
Mingming Cao617ba132006-10-11 01:20:53 -07002572 loff_t res = EXT4_NDIR_BLOCKS;
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05002573 int meta_blocks;
2574 loff_t upper_limit;
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04002575 /* This is calculated to be the largest file size for a dense, block
2576 * mapped file such that the file's total number of 512-byte sectors,
2577 * including data and all indirect blocks, does not exceed (2^48 - 1).
2578 *
2579 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2580 * number of 512-byte sectors of the file.
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05002581 */
2582
Theodore Ts'of287a1a2008-10-16 22:50:48 -04002583 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05002584 /*
Bartlomiej Zolnierkiewicz90c699a2009-06-19 08:08:50 +02002585 * !has_huge_files or CONFIG_LBDAF not enabled implies that
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04002586 * the inode i_block field represents total file blocks in
2587 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05002588 */
2589 upper_limit = (1LL << 32) - 1;
2590
2591 /* total blocks in file system block size */
2592 upper_limit >>= (bits - 9);
2593
2594 } else {
Aneesh Kumar K.V8180a562008-01-28 23:58:27 -05002595 /*
2596 * We use 48 bit ext4_inode i_blocks
2597 * With EXT4_HUGE_FILE_FL set the i_blocks
2598 * represent total number of blocks in
2599 * file system block size
2600 */
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05002601 upper_limit = (1LL << 48) - 1;
2602
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05002603 }
2604
2605 /* indirect blocks */
2606 meta_blocks = 1;
2607 /* double indirect blocks */
2608 meta_blocks += 1 + (1LL << (bits-2));
2609 /* tripple indirect blocks */
2610 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2611
2612 upper_limit -= meta_blocks;
2613 upper_limit <<= bits;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002614
2615 res += 1LL << (bits-2);
2616 res += 1LL << (2*(bits-2));
2617 res += 1LL << (3*(bits-2));
2618 res <<= bits;
2619 if (res > upper_limit)
2620 res = upper_limit;
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05002621
2622 if (res > MAX_LFS_FILESIZE)
2623 res = MAX_LFS_FILESIZE;
2624
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002625 return res;
2626}
2627
Mingming Cao617ba132006-10-11 01:20:53 -07002628static ext4_fsblk_t descriptor_loc(struct super_block *sb,
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04002629 ext4_fsblk_t logical_sb_block, int nr)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002630{
Mingming Cao617ba132006-10-11 01:20:53 -07002631 struct ext4_sb_info *sbi = EXT4_SB(sb);
Avantika Mathurfd2d4292008-01-28 23:58:27 -05002632 ext4_group_t bg, first_meta_bg;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002633 int has_super = 0;
2634
2635 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2636
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04002637 if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
Andrew Morton70bbb3e2006-10-11 01:21:20 -07002638 return logical_sb_block + nr + 1;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002639 bg = sbi->s_desc_per_block * nr;
Mingming Cao617ba132006-10-11 01:20:53 -07002640 if (ext4_bg_has_super(sb, bg))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002641 has_super = 1;
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04002642
Darrick J. Wongbd63f6b2014-05-12 10:06:27 -04002643 /*
2644 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
2645 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
2646 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
2647 * compensate.
2648 */
2649 if (sb->s_blocksize == 1024 && nr == 0 &&
2650 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block) == 0)
2651 has_super++;
2652
Mingming Cao617ba132006-10-11 01:20:53 -07002653 return (has_super + ext4_group_first_block_no(sb, bg));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002654}
2655
Alex Tomasc9de5602008-01-29 00:19:52 -05002656/**
2657 * ext4_get_stripe_size: Get the stripe size.
2658 * @sbi: In memory super block info
2659 *
2660 * If we have specified it via mount option, then
2661 * use the mount option value. If the value specified at mount time is
2662 * greater than the blocks per group use the super block value.
2663 * If the super block value is greater than blocks per group return 0.
2664 * Allocator needs it be less than blocks per group.
2665 *
2666 */
2667static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2668{
2669 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2670 unsigned long stripe_width =
2671 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
Dan Ehrenberg3eb08652011-07-17 21:18:51 -04002672 int ret;
Alex Tomasc9de5602008-01-29 00:19:52 -05002673
2674 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
Dan Ehrenberg3eb08652011-07-17 21:18:51 -04002675 ret = sbi->s_stripe;
Jan Kara16d65c02017-10-07 22:36:49 +00002676 else if (stripe_width && stripe_width <= sbi->s_blocks_per_group)
Dan Ehrenberg3eb08652011-07-17 21:18:51 -04002677 ret = stripe_width;
Jan Kara16d65c02017-10-07 22:36:49 +00002678 else if (stride && stride <= sbi->s_blocks_per_group)
Dan Ehrenberg3eb08652011-07-17 21:18:51 -04002679 ret = stride;
2680 else
2681 ret = 0;
Alex Tomasc9de5602008-01-29 00:19:52 -05002682
Dan Ehrenberg3eb08652011-07-17 21:18:51 -04002683 /*
2684 * If the stripe width is 1, this makes no sense and
2685 * we set it to 0 to turn off stripe handling code.
2686 */
2687 if (ret <= 1)
2688 ret = 0;
Alex Tomasc9de5602008-01-29 00:19:52 -05002689
Dan Ehrenberg3eb08652011-07-17 21:18:51 -04002690 return ret;
Alex Tomasc9de5602008-01-29 00:19:52 -05002691}
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002692
Eric Sandeena13fb1a2009-08-18 00:20:23 -04002693/*
2694 * Check whether this filesystem can be mounted based on
2695 * the features present and the RDONLY/RDWR mount requested.
2696 * Returns 1 if this filesystem can be mounted as requested,
2697 * 0 if it cannot be.
2698 */
2699static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2700{
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04002701 if (ext4_has_unknown_ext4_incompat_features(sb)) {
Eric Sandeena13fb1a2009-08-18 00:20:23 -04002702 ext4_msg(sb, KERN_ERR,
2703 "Couldn't mount because of "
2704 "unsupported optional features (%x)",
2705 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2706 ~EXT4_FEATURE_INCOMPAT_SUPP));
2707 return 0;
2708 }
2709
2710 if (readonly)
2711 return 1;
2712
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04002713 if (ext4_has_feature_readonly(sb)) {
Darrick J. Wong2cb5cc82015-02-12 22:31:21 -05002714 ext4_msg(sb, KERN_INFO, "filesystem is read-only");
2715 sb->s_flags |= MS_RDONLY;
2716 return 1;
2717 }
2718
Eric Sandeena13fb1a2009-08-18 00:20:23 -04002719 /* Check that feature set is OK for a read-write mount */
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04002720 if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
Eric Sandeena13fb1a2009-08-18 00:20:23 -04002721 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2722 "unsupported optional features (%x)",
2723 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2724 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2725 return 0;
2726 }
2727 /*
2728 * Large file size enabled file system can only be mounted
2729 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2730 */
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04002731 if (ext4_has_feature_huge_file(sb)) {
Eric Sandeena13fb1a2009-08-18 00:20:23 -04002732 if (sizeof(blkcnt_t) < sizeof(u64)) {
2733 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2734 "cannot be mounted RDWR without "
2735 "CONFIG_LBDAF");
2736 return 0;
2737 }
2738 }
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04002739 if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
Theodore Ts'obab08ab2011-09-09 18:36:51 -04002740 ext4_msg(sb, KERN_ERR,
2741 "Can't support bigalloc feature without "
2742 "extents feature\n");
2743 return 0;
2744 }
Aditya Kali7c319d32012-07-22 20:21:31 -04002745
2746#ifndef CONFIG_QUOTA
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04002747 if (ext4_has_feature_quota(sb) && !readonly) {
Aditya Kali7c319d32012-07-22 20:21:31 -04002748 ext4_msg(sb, KERN_ERR,
2749 "Filesystem with quota feature cannot be mounted RDWR "
2750 "without CONFIG_QUOTA");
2751 return 0;
2752 }
Li Xi689c9582016-01-08 16:01:22 -05002753 if (ext4_has_feature_project(sb) && !readonly) {
2754 ext4_msg(sb, KERN_ERR,
2755 "Filesystem with project quota feature cannot be mounted RDWR "
2756 "without CONFIG_QUOTA");
2757 return 0;
2758 }
Aditya Kali7c319d32012-07-22 20:21:31 -04002759#endif /* CONFIG_QUOTA */
Eric Sandeena13fb1a2009-08-18 00:20:23 -04002760 return 1;
2761}
2762
Theodore Ts'o66e61a92010-07-27 11:56:04 -04002763/*
2764 * This function is called once a day if we have errors logged
2765 * on the file system
2766 */
2767static void print_daily_error_info(unsigned long arg)
2768{
2769 struct super_block *sb = (struct super_block *) arg;
2770 struct ext4_sb_info *sbi;
2771 struct ext4_super_block *es;
2772
2773 sbi = EXT4_SB(sb);
2774 es = sbi->s_es;
2775
2776 if (es->s_error_count)
Theodore Ts'oae0f78d2014-07-05 18:40:52 -04002777 /* fsck newer than v1.41.13 is needed to clean this condition. */
2778 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
Theodore Ts'o66e61a92010-07-27 11:56:04 -04002779 le32_to_cpu(es->s_error_count));
2780 if (es->s_first_error_time) {
Theodore Ts'oae0f78d2014-07-05 18:40:52 -04002781 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d",
Theodore Ts'o66e61a92010-07-27 11:56:04 -04002782 sb->s_id, le32_to_cpu(es->s_first_error_time),
2783 (int) sizeof(es->s_first_error_func),
2784 es->s_first_error_func,
2785 le32_to_cpu(es->s_first_error_line));
2786 if (es->s_first_error_ino)
Joe Perches651e1c32016-10-12 23:12:53 -04002787 printk(KERN_CONT ": inode %u",
Theodore Ts'o66e61a92010-07-27 11:56:04 -04002788 le32_to_cpu(es->s_first_error_ino));
2789 if (es->s_first_error_block)
Joe Perches651e1c32016-10-12 23:12:53 -04002790 printk(KERN_CONT ": block %llu", (unsigned long long)
Theodore Ts'o66e61a92010-07-27 11:56:04 -04002791 le64_to_cpu(es->s_first_error_block));
Joe Perches651e1c32016-10-12 23:12:53 -04002792 printk(KERN_CONT "\n");
Theodore Ts'o66e61a92010-07-27 11:56:04 -04002793 }
2794 if (es->s_last_error_time) {
Theodore Ts'oae0f78d2014-07-05 18:40:52 -04002795 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d",
Theodore Ts'o66e61a92010-07-27 11:56:04 -04002796 sb->s_id, le32_to_cpu(es->s_last_error_time),
2797 (int) sizeof(es->s_last_error_func),
2798 es->s_last_error_func,
2799 le32_to_cpu(es->s_last_error_line));
2800 if (es->s_last_error_ino)
Joe Perches651e1c32016-10-12 23:12:53 -04002801 printk(KERN_CONT ": inode %u",
Theodore Ts'o66e61a92010-07-27 11:56:04 -04002802 le32_to_cpu(es->s_last_error_ino));
2803 if (es->s_last_error_block)
Joe Perches651e1c32016-10-12 23:12:53 -04002804 printk(KERN_CONT ": block %llu", (unsigned long long)
Theodore Ts'o66e61a92010-07-27 11:56:04 -04002805 le64_to_cpu(es->s_last_error_block));
Joe Perches651e1c32016-10-12 23:12:53 -04002806 printk(KERN_CONT "\n");
Theodore Ts'o66e61a92010-07-27 11:56:04 -04002807 }
2808 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2809}
2810
Lukas Czernerbfff6872010-10-27 21:30:05 -04002811/* Find next suitable group and run ext4_init_inode_table */
2812static int ext4_run_li_request(struct ext4_li_request *elr)
2813{
2814 struct ext4_group_desc *gdp = NULL;
2815 ext4_group_t group, ngroups;
2816 struct super_block *sb;
2817 unsigned long timeout = 0;
2818 int ret = 0;
2819
2820 sb = elr->lr_super;
2821 ngroups = EXT4_SB(sb)->s_groups_count;
2822
2823 for (group = elr->lr_next_group; group < ngroups; group++) {
2824 gdp = ext4_get_group_desc(sb, group, NULL);
2825 if (!gdp) {
2826 ret = 1;
2827 break;
2828 }
2829
2830 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2831 break;
2832 }
2833
Theodore Ts'o7f511862013-01-13 08:41:45 -05002834 if (group >= ngroups)
Lukas Czernerbfff6872010-10-27 21:30:05 -04002835 ret = 1;
2836
2837 if (!ret) {
2838 timeout = jiffies;
2839 ret = ext4_init_inode_table(sb, group,
2840 elr->lr_timeout ? 0 : 1);
2841 if (elr->lr_timeout == 0) {
Lukas Czerner51ce6512011-05-20 13:55:16 -04002842 timeout = (jiffies - timeout) *
2843 elr->lr_sbi->s_li_wait_mult;
Lukas Czernerbfff6872010-10-27 21:30:05 -04002844 elr->lr_timeout = timeout;
2845 }
2846 elr->lr_next_sched = jiffies + elr->lr_timeout;
2847 elr->lr_next_group = group + 1;
2848 }
Lukas Czernerbfff6872010-10-27 21:30:05 -04002849 return ret;
2850}
2851
2852/*
2853 * Remove lr_request from the list_request and free the
Lukas Czerner4ed5c032011-05-20 13:49:04 -04002854 * request structure. Should be called with li_list_mtx held
Lukas Czernerbfff6872010-10-27 21:30:05 -04002855 */
2856static void ext4_remove_li_request(struct ext4_li_request *elr)
2857{
2858 struct ext4_sb_info *sbi;
2859
2860 if (!elr)
2861 return;
2862
2863 sbi = elr->lr_sbi;
2864
2865 list_del(&elr->lr_request);
2866 sbi->s_li_request = NULL;
2867 kfree(elr);
2868}
2869
2870static void ext4_unregister_li_request(struct super_block *sb)
2871{
Lukas Czerner1bb933f2011-05-20 13:55:29 -04002872 mutex_lock(&ext4_li_mtx);
2873 if (!ext4_li_info) {
2874 mutex_unlock(&ext4_li_mtx);
Lukas Czernerbfff6872010-10-27 21:30:05 -04002875 return;
Lukas Czerner1bb933f2011-05-20 13:55:29 -04002876 }
Lukas Czernerbfff6872010-10-27 21:30:05 -04002877
2878 mutex_lock(&ext4_li_info->li_list_mtx);
Lukas Czerner1bb933f2011-05-20 13:55:29 -04002879 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
Lukas Czernerbfff6872010-10-27 21:30:05 -04002880 mutex_unlock(&ext4_li_info->li_list_mtx);
Lukas Czerner1bb933f2011-05-20 13:55:29 -04002881 mutex_unlock(&ext4_li_mtx);
Lukas Czernerbfff6872010-10-27 21:30:05 -04002882}
2883
Eric Sandeen8f1f7452011-02-03 14:33:15 -05002884static struct task_struct *ext4_lazyinit_task;
2885
Lukas Czernerbfff6872010-10-27 21:30:05 -04002886/*
2887 * This is the function where ext4lazyinit thread lives. It walks
2888 * through the request list searching for next scheduled filesystem.
2889 * When such a fs is found, run the lazy initialization request
2890 * (ext4_rn_li_request) and keep track of the time spend in this
2891 * function. Based on that time we compute next schedule time of
2892 * the request. When walking through the list is complete, compute
2893 * next waking time and put itself into sleep.
2894 */
2895static int ext4_lazyinit_thread(void *arg)
2896{
2897 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2898 struct list_head *pos, *n;
2899 struct ext4_li_request *elr;
Lukas Czerner4ed5c032011-05-20 13:49:04 -04002900 unsigned long next_wakeup, cur;
Lukas Czernerbfff6872010-10-27 21:30:05 -04002901
2902 BUG_ON(NULL == eli);
2903
Lukas Czernerbfff6872010-10-27 21:30:05 -04002904cont_thread:
2905 while (true) {
2906 next_wakeup = MAX_JIFFY_OFFSET;
2907
2908 mutex_lock(&eli->li_list_mtx);
2909 if (list_empty(&eli->li_request_list)) {
2910 mutex_unlock(&eli->li_list_mtx);
2911 goto exit_thread;
2912 }
Lukas Czernerbfff6872010-10-27 21:30:05 -04002913 list_for_each_safe(pos, n, &eli->li_request_list) {
Dmitry Monakhove22834f2016-09-05 23:38:36 -04002914 int err = 0;
2915 int progress = 0;
Lukas Czernerbfff6872010-10-27 21:30:05 -04002916 elr = list_entry(pos, struct ext4_li_request,
2917 lr_request);
2918
Dmitry Monakhove22834f2016-09-05 23:38:36 -04002919 if (time_before(jiffies, elr->lr_next_sched)) {
2920 if (time_before(elr->lr_next_sched, next_wakeup))
2921 next_wakeup = elr->lr_next_sched;
2922 continue;
Lukas Czernerbfff6872010-10-27 21:30:05 -04002923 }
Dmitry Monakhove22834f2016-09-05 23:38:36 -04002924 if (down_read_trylock(&elr->lr_super->s_umount)) {
2925 if (sb_start_write_trylock(elr->lr_super)) {
2926 progress = 1;
2927 /*
2928 * We hold sb->s_umount, sb can not
2929 * be removed from the list, it is
2930 * now safe to drop li_list_mtx
2931 */
2932 mutex_unlock(&eli->li_list_mtx);
2933 err = ext4_run_li_request(elr);
2934 sb_end_write(elr->lr_super);
2935 mutex_lock(&eli->li_list_mtx);
2936 n = pos->next;
2937 }
2938 up_read((&elr->lr_super->s_umount));
2939 }
2940 /* error, remove the lazy_init job */
2941 if (err) {
2942 ext4_remove_li_request(elr);
2943 continue;
2944 }
2945 if (!progress) {
2946 elr->lr_next_sched = jiffies +
2947 (prandom_u32()
2948 % (EXT4_DEF_LI_MAX_START_DELAY * HZ));
2949 }
Lukas Czernerbfff6872010-10-27 21:30:05 -04002950 if (time_before(elr->lr_next_sched, next_wakeup))
2951 next_wakeup = elr->lr_next_sched;
2952 }
2953 mutex_unlock(&eli->li_list_mtx);
2954
Tejun Heoa0acae02011-11-21 12:32:22 -08002955 try_to_freeze();
Lukas Czernerbfff6872010-10-27 21:30:05 -04002956
Lukas Czerner4ed5c032011-05-20 13:49:04 -04002957 cur = jiffies;
2958 if ((time_after_eq(cur, next_wakeup)) ||
Lukas Czernerf4245bd2010-11-02 14:07:17 -04002959 (MAX_JIFFY_OFFSET == next_wakeup)) {
Lukas Czernerbfff6872010-10-27 21:30:05 -04002960 cond_resched();
2961 continue;
2962 }
2963
Lukas Czerner4ed5c032011-05-20 13:49:04 -04002964 schedule_timeout_interruptible(next_wakeup - cur);
2965
Eric Sandeen8f1f7452011-02-03 14:33:15 -05002966 if (kthread_should_stop()) {
2967 ext4_clear_request_list();
2968 goto exit_thread;
2969 }
Lukas Czernerbfff6872010-10-27 21:30:05 -04002970 }
2971
2972exit_thread:
2973 /*
2974 * It looks like the request list is empty, but we need
2975 * to check it under the li_list_mtx lock, to prevent any
2976 * additions into it, and of course we should lock ext4_li_mtx
2977 * to atomically free the list and ext4_li_info, because at
2978 * this point another ext4 filesystem could be registering
2979 * new one.
2980 */
2981 mutex_lock(&ext4_li_mtx);
2982 mutex_lock(&eli->li_list_mtx);
2983 if (!list_empty(&eli->li_request_list)) {
2984 mutex_unlock(&eli->li_list_mtx);
2985 mutex_unlock(&ext4_li_mtx);
2986 goto cont_thread;
2987 }
2988 mutex_unlock(&eli->li_list_mtx);
Lukas Czernerbfff6872010-10-27 21:30:05 -04002989 kfree(ext4_li_info);
2990 ext4_li_info = NULL;
2991 mutex_unlock(&ext4_li_mtx);
2992
2993 return 0;
2994}
2995
2996static void ext4_clear_request_list(void)
2997{
2998 struct list_head *pos, *n;
2999 struct ext4_li_request *elr;
3000
3001 mutex_lock(&ext4_li_info->li_list_mtx);
Lukas Czernerbfff6872010-10-27 21:30:05 -04003002 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
3003 elr = list_entry(pos, struct ext4_li_request,
3004 lr_request);
3005 ext4_remove_li_request(elr);
3006 }
3007 mutex_unlock(&ext4_li_info->li_list_mtx);
3008}
3009
3010static int ext4_run_lazyinit_thread(void)
3011{
Eric Sandeen8f1f7452011-02-03 14:33:15 -05003012 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
3013 ext4_li_info, "ext4lazyinit");
3014 if (IS_ERR(ext4_lazyinit_task)) {
3015 int err = PTR_ERR(ext4_lazyinit_task);
Lukas Czernerbfff6872010-10-27 21:30:05 -04003016 ext4_clear_request_list();
Lukas Czernerbfff6872010-10-27 21:30:05 -04003017 kfree(ext4_li_info);
3018 ext4_li_info = NULL;
Theodore Ts'o92b97812012-03-19 23:41:49 -04003019 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
Lukas Czernerbfff6872010-10-27 21:30:05 -04003020 "initialization thread\n",
3021 err);
3022 return err;
3023 }
3024 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
Lukas Czernerbfff6872010-10-27 21:30:05 -04003025 return 0;
3026}
3027
3028/*
3029 * Check whether it make sense to run itable init. thread or not.
3030 * If there is at least one uninitialized inode table, return
3031 * corresponding group number, else the loop goes through all
3032 * groups and return total number of groups.
3033 */
3034static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
3035{
3036 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
3037 struct ext4_group_desc *gdp = NULL;
3038
Theodore Ts'o5ae57322018-06-14 00:58:00 -04003039 if (!ext4_has_group_desc_csum(sb))
3040 return ngroups;
3041
Lukas Czernerbfff6872010-10-27 21:30:05 -04003042 for (group = 0; group < ngroups; group++) {
3043 gdp = ext4_get_group_desc(sb, group, NULL);
3044 if (!gdp)
3045 continue;
3046
Theodore Ts'o954e5722018-07-28 08:12:04 -04003047 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
Lukas Czernerbfff6872010-10-27 21:30:05 -04003048 break;
3049 }
3050
3051 return group;
3052}
3053
3054static int ext4_li_info_new(void)
3055{
3056 struct ext4_lazy_init *eli = NULL;
3057
3058 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
3059 if (!eli)
3060 return -ENOMEM;
3061
Lukas Czernerbfff6872010-10-27 21:30:05 -04003062 INIT_LIST_HEAD(&eli->li_request_list);
3063 mutex_init(&eli->li_list_mtx);
3064
Lukas Czernerbfff6872010-10-27 21:30:05 -04003065 eli->li_state |= EXT4_LAZYINIT_QUIT;
3066
3067 ext4_li_info = eli;
3068
3069 return 0;
3070}
3071
3072static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3073 ext4_group_t start)
3074{
3075 struct ext4_sb_info *sbi = EXT4_SB(sb);
3076 struct ext4_li_request *elr;
Lukas Czernerbfff6872010-10-27 21:30:05 -04003077
3078 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3079 if (!elr)
3080 return NULL;
3081
3082 elr->lr_super = sb;
3083 elr->lr_sbi = sbi;
3084 elr->lr_next_group = start;
3085
3086 /*
3087 * Randomize first schedule time of the request to
3088 * spread the inode table initialization requests
3089 * better.
3090 */
Theodore Ts'odd1f7232013-11-08 00:14:53 -05003091 elr->lr_next_sched = jiffies + (prandom_u32() %
3092 (EXT4_DEF_LI_MAX_START_DELAY * HZ));
Lukas Czernerbfff6872010-10-27 21:30:05 -04003093 return elr;
3094}
3095
Theodore Ts'o7f511862013-01-13 08:41:45 -05003096int ext4_register_li_request(struct super_block *sb,
3097 ext4_group_t first_not_zeroed)
Lukas Czernerbfff6872010-10-27 21:30:05 -04003098{
3099 struct ext4_sb_info *sbi = EXT4_SB(sb);
Theodore Ts'o7f511862013-01-13 08:41:45 -05003100 struct ext4_li_request *elr = NULL;
Lukas Czernerbfff6872010-10-27 21:30:05 -04003101 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
Andrew Morton6c5a6cb2011-01-10 12:30:17 -05003102 int ret = 0;
Lukas Czernerbfff6872010-10-27 21:30:05 -04003103
Theodore Ts'o7f511862013-01-13 08:41:45 -05003104 mutex_lock(&ext4_li_mtx);
Lukas Czerner51ce6512011-05-20 13:55:16 -04003105 if (sbi->s_li_request != NULL) {
3106 /*
3107 * Reset timeout so it can be computed again, because
3108 * s_li_wait_mult might have changed.
3109 */
3110 sbi->s_li_request->lr_timeout = 0;
Theodore Ts'o7f511862013-01-13 08:41:45 -05003111 goto out;
Lukas Czerner51ce6512011-05-20 13:55:16 -04003112 }
Lukas Czernerbfff6872010-10-27 21:30:05 -04003113
3114 if (first_not_zeroed == ngroups ||
3115 (sb->s_flags & MS_RDONLY) ||
Tao Ma55ff3842011-05-09 10:28:41 -04003116 !test_opt(sb, INIT_INODE_TABLE))
Theodore Ts'o7f511862013-01-13 08:41:45 -05003117 goto out;
Lukas Czernerbfff6872010-10-27 21:30:05 -04003118
3119 elr = ext4_li_request_new(sb, first_not_zeroed);
Theodore Ts'o7f511862013-01-13 08:41:45 -05003120 if (!elr) {
3121 ret = -ENOMEM;
3122 goto out;
3123 }
Lukas Czernerbfff6872010-10-27 21:30:05 -04003124
3125 if (NULL == ext4_li_info) {
3126 ret = ext4_li_info_new();
3127 if (ret)
3128 goto out;
3129 }
3130
3131 mutex_lock(&ext4_li_info->li_list_mtx);
3132 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3133 mutex_unlock(&ext4_li_info->li_list_mtx);
3134
3135 sbi->s_li_request = elr;
Tao Ma46e46902011-04-04 16:00:49 -04003136 /*
3137 * set elr to NULL here since it has been inserted to
3138 * the request_list and the removal and free of it is
3139 * handled by ext4_clear_request_list from now on.
3140 */
3141 elr = NULL;
Lukas Czernerbfff6872010-10-27 21:30:05 -04003142
3143 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3144 ret = ext4_run_lazyinit_thread();
3145 if (ret)
3146 goto out;
3147 }
Lukas Czernerbfff6872010-10-27 21:30:05 -04003148out:
Nicolas Kaiserbeed5ecb2010-10-27 22:08:42 -04003149 mutex_unlock(&ext4_li_mtx);
3150 if (ret)
Lukas Czernerbfff6872010-10-27 21:30:05 -04003151 kfree(elr);
Lukas Czernerbfff6872010-10-27 21:30:05 -04003152 return ret;
3153}
3154
3155/*
3156 * We do not need to lock anything since this is called on
3157 * module unload.
3158 */
3159static void ext4_destroy_lazyinit_thread(void)
3160{
3161 /*
3162 * If thread exited earlier
3163 * there's nothing to be done.
3164 */
Eric Sandeen8f1f7452011-02-03 14:33:15 -05003165 if (!ext4_li_info || !ext4_lazyinit_task)
Lukas Czernerbfff6872010-10-27 21:30:05 -04003166 return;
3167
Eric Sandeen8f1f7452011-02-03 14:33:15 -05003168 kthread_stop(ext4_lazyinit_task);
Lukas Czernerbfff6872010-10-27 21:30:05 -04003169}
3170
Darrick J. Wong25ed6e82012-05-27 07:48:56 -04003171static int set_journal_csum_feature_set(struct super_block *sb)
3172{
3173 int ret = 1;
3174 int compat, incompat;
3175 struct ext4_sb_info *sbi = EXT4_SB(sb);
3176
Dmitry Monakhov9aa5d322014-10-13 03:36:16 -04003177 if (ext4_has_metadata_csum(sb)) {
Darrick J. Wongdb9ee222014-08-27 18:40:07 -04003178 /* journal checksum v3 */
Darrick J. Wong25ed6e82012-05-27 07:48:56 -04003179 compat = 0;
Darrick J. Wongdb9ee222014-08-27 18:40:07 -04003180 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
Darrick J. Wong25ed6e82012-05-27 07:48:56 -04003181 } else {
3182 /* journal checksum v1 */
3183 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3184 incompat = 0;
3185 }
3186
Darrick J. Wongfeb8c6d2014-09-11 11:38:21 -04003187 jbd2_journal_clear_features(sbi->s_journal,
3188 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3189 JBD2_FEATURE_INCOMPAT_CSUM_V3 |
3190 JBD2_FEATURE_INCOMPAT_CSUM_V2);
Darrick J. Wong25ed6e82012-05-27 07:48:56 -04003191 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3192 ret = jbd2_journal_set_features(sbi->s_journal,
3193 compat, 0,
3194 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3195 incompat);
3196 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3197 ret = jbd2_journal_set_features(sbi->s_journal,
3198 compat, 0,
3199 incompat);
3200 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3201 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3202 } else {
Darrick J. Wongfeb8c6d2014-09-11 11:38:21 -04003203 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3204 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
Darrick J. Wong25ed6e82012-05-27 07:48:56 -04003205 }
3206
3207 return ret;
3208}
3209
Theodore Ts'o952fc182012-07-09 16:27:05 -04003210/*
3211 * Note: calculating the overhead so we can be compatible with
3212 * historical BSD practice is quite difficult in the face of
3213 * clusters/bigalloc. This is because multiple metadata blocks from
3214 * different block group can end up in the same allocation cluster.
3215 * Calculating the exact overhead in the face of clustered allocation
3216 * requires either O(all block bitmaps) in memory or O(number of block
3217 * groups**2) in time. We will still calculate the superblock for
3218 * older file systems --- and if we come across with a bigalloc file
3219 * system with zero in s_overhead_clusters the estimate will be close to
3220 * correct especially for very large cluster sizes --- but for newer
3221 * file systems, it's better to calculate this figure once at mkfs
3222 * time, and store it in the superblock. If the superblock value is
3223 * present (even for non-bigalloc file systems), we will use it.
3224 */
3225static int count_overhead(struct super_block *sb, ext4_group_t grp,
3226 char *buf)
3227{
3228 struct ext4_sb_info *sbi = EXT4_SB(sb);
3229 struct ext4_group_desc *gdp;
3230 ext4_fsblk_t first_block, last_block, b;
3231 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3232 int s, j, count = 0;
3233
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04003234 if (!ext4_has_feature_bigalloc(sb))
Theodore Ts'o0548bbb2012-08-16 11:59:04 -04003235 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3236 sbi->s_itb_per_group + 2);
3237
Theodore Ts'o952fc182012-07-09 16:27:05 -04003238 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3239 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3240 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3241 for (i = 0; i < ngroups; i++) {
3242 gdp = ext4_get_group_desc(sb, i, NULL);
3243 b = ext4_block_bitmap(sb, gdp);
3244 if (b >= first_block && b <= last_block) {
3245 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3246 count++;
3247 }
3248 b = ext4_inode_bitmap(sb, gdp);
3249 if (b >= first_block && b <= last_block) {
3250 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3251 count++;
3252 }
3253 b = ext4_inode_table(sb, gdp);
3254 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3255 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3256 int c = EXT4_B2C(sbi, b - first_block);
3257 ext4_set_bit(c, buf);
3258 count++;
3259 }
3260 if (i != grp)
3261 continue;
3262 s = 0;
3263 if (ext4_bg_has_super(sb, grp)) {
3264 ext4_set_bit(s++, buf);
3265 count++;
3266 }
Theodore Ts'o8084f572016-11-18 13:37:47 -05003267 j = ext4_bg_num_gdb(sb, grp);
3268 if (s + j > EXT4_BLOCKS_PER_GROUP(sb)) {
3269 ext4_error(sb, "Invalid number of block group "
3270 "descriptor blocks: %d", j);
3271 j = EXT4_BLOCKS_PER_GROUP(sb) - s;
Theodore Ts'o952fc182012-07-09 16:27:05 -04003272 }
Theodore Ts'o8084f572016-11-18 13:37:47 -05003273 count += j;
3274 for (; j > 0; j--)
3275 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
Theodore Ts'o952fc182012-07-09 16:27:05 -04003276 }
3277 if (!count)
3278 return 0;
3279 return EXT4_CLUSTERS_PER_GROUP(sb) -
3280 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3281}
3282
3283/*
3284 * Compute the overhead and stash it in sbi->s_overhead
3285 */
3286int ext4_calculate_overhead(struct super_block *sb)
3287{
3288 struct ext4_sb_info *sbi = EXT4_SB(sb);
3289 struct ext4_super_block *es = sbi->s_es;
Eric Whitney3c816de2016-09-30 02:08:49 -04003290 struct inode *j_inode;
3291 unsigned int j_blocks, j_inum = le32_to_cpu(es->s_journal_inum);
Theodore Ts'o952fc182012-07-09 16:27:05 -04003292 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3293 ext4_fsblk_t overhead = 0;
Dmitry Monakhov4fdb5542014-11-25 13:08:04 -05003294 char *buf = (char *) get_zeroed_page(GFP_NOFS);
Theodore Ts'o952fc182012-07-09 16:27:05 -04003295
Theodore Ts'o952fc182012-07-09 16:27:05 -04003296 if (!buf)
3297 return -ENOMEM;
3298
3299 /*
3300 * Compute the overhead (FS structures). This is constant
3301 * for a given filesystem unless the number of block groups
3302 * changes so we cache the previous value until it does.
3303 */
3304
3305 /*
3306 * All of the blocks before first_data_block are overhead
3307 */
3308 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3309
3310 /*
3311 * Add the overhead found in each block group
3312 */
3313 for (i = 0; i < ngroups; i++) {
3314 int blks;
3315
3316 blks = count_overhead(sb, i, buf);
3317 overhead += blks;
3318 if (blks)
3319 memset(buf, 0, PAGE_SIZE);
3320 cond_resched();
3321 }
Eric Whitney3c816de2016-09-30 02:08:49 -04003322
3323 /*
3324 * Add the internal journal blocks whether the journal has been
3325 * loaded or not
3326 */
Eric Sandeenb003b522014-11-25 16:27:44 -05003327 if (sbi->s_journal && !sbi->journal_bdev)
Lukas Czerner810da242013-03-02 17:18:58 -05003328 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
Eric Whitney3c816de2016-09-30 02:08:49 -04003329 else if (ext4_has_feature_journal(sb) && !sbi->s_journal) {
3330 j_inode = ext4_get_journal_inode(sb, j_inum);
3331 if (j_inode) {
3332 j_blocks = j_inode->i_size >> sb->s_blocksize_bits;
3333 overhead += EXT4_NUM_B2C(sbi, j_blocks);
3334 iput(j_inode);
3335 } else {
3336 ext4_msg(sb, KERN_ERR, "can't get journal size");
3337 }
3338 }
Theodore Ts'o952fc182012-07-09 16:27:05 -04003339 sbi->s_overhead = overhead;
3340 smp_wmb();
3341 free_page((unsigned long) buf);
3342 return 0;
3343}
3344
Theodore Ts'ob5799012015-09-23 12:44:17 -04003345static void ext4_set_resv_clusters(struct super_block *sb)
Lukas Czerner27dd4382013-04-09 22:11:22 -04003346{
3347 ext4_fsblk_t resv_clusters;
Theodore Ts'ob5799012015-09-23 12:44:17 -04003348 struct ext4_sb_info *sbi = EXT4_SB(sb);
Lukas Czerner27dd4382013-04-09 22:11:22 -04003349
3350 /*
Jan Kara30fac0f2013-12-08 21:11:59 -05003351 * There's no need to reserve anything when we aren't using extents.
3352 * The space estimates are exact, there are no unwritten extents,
3353 * hole punching doesn't need new metadata... This is needed especially
3354 * to keep ext2/3 backward compatibility.
3355 */
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04003356 if (!ext4_has_feature_extents(sb))
Theodore Ts'ob5799012015-09-23 12:44:17 -04003357 return;
Jan Kara30fac0f2013-12-08 21:11:59 -05003358 /*
Lukas Czerner27dd4382013-04-09 22:11:22 -04003359 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3360 * This should cover the situations where we can not afford to run
3361 * out of space like for example punch hole, or converting
Lukas Czerner556615d2014-04-20 23:45:47 -04003362 * unwritten extents in delalloc path. In most cases such
Lukas Czerner27dd4382013-04-09 22:11:22 -04003363 * allocation would require 1, or 2 blocks, higher numbers are
3364 * very rare.
3365 */
Theodore Ts'ob5799012015-09-23 12:44:17 -04003366 resv_clusters = (ext4_blocks_count(sbi->s_es) >>
3367 sbi->s_cluster_bits);
Lukas Czerner27dd4382013-04-09 22:11:22 -04003368
3369 do_div(resv_clusters, 50);
3370 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3371
Theodore Ts'ob5799012015-09-23 12:44:17 -04003372 atomic64_set(&sbi->s_resv_clusters, resv_clusters);
Lukas Czerner27dd4382013-04-09 22:11:22 -04003373}
3374
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04003375static int ext4_fill_super(struct super_block *sb, void *data, int silent)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003376{
Curt Wohlgemuthd4c402d2010-05-16 12:00:00 -04003377 char *orig_data = kstrdup(data, GFP_KERNEL);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04003378 struct buffer_head *bh;
Mingming Cao617ba132006-10-11 01:20:53 -07003379 struct ext4_super_block *es = NULL;
Theodore Ts'o956e2a02016-11-18 13:24:26 -05003380 struct ext4_sb_info *sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
Mingming Cao617ba132006-10-11 01:20:53 -07003381 ext4_fsblk_t block;
3382 ext4_fsblk_t sb_block = get_sb_block(&data);
Andrew Morton70bbb3e2006-10-11 01:21:20 -07003383 ext4_fsblk_t logical_sb_block;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003384 unsigned long offset = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003385 unsigned long journal_devnum = 0;
3386 unsigned long def_mount_opts;
3387 struct inode *root;
Frank Mayhar03901312009-01-07 00:06:22 -05003388 const char *descr;
Cyrill Gorcunovdcc7dae2010-07-27 11:56:07 -04003389 int ret = -ENOMEM;
Theodore Ts'o281b5992011-09-09 18:34:51 -04003390 int blocksize, clustersize;
Theodore Ts'o4ec11022009-01-06 14:53:26 -05003391 unsigned int db_count;
3392 unsigned int i;
Theodore Ts'o281b5992011-09-09 18:34:51 -04003393 int needs_recovery, has_huge_files, has_bigalloc;
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07003394 __u64 blocks_count;
Lukas Czerner07aa2ea2012-11-08 15:16:54 -05003395 int err = 0;
Theodore Ts'ob3881f72009-01-05 22:46:26 -05003396 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
Lukas Czernerbfff6872010-10-27 21:30:05 -04003397 ext4_group_t first_not_zeroed;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003398
Theodore Ts'o956e2a02016-11-18 13:24:26 -05003399 if ((data && !orig_data) || !sbi)
3400 goto out_free_base;
Pekka Enberg705895b2009-02-15 18:07:52 -05003401
3402 sbi->s_blockgroup_lock =
3403 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
Theodore Ts'o956e2a02016-11-18 13:24:26 -05003404 if (!sbi->s_blockgroup_lock)
3405 goto out_free_base;
3406
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003407 sb->s_fs_info = sbi;
Theodore Ts'o2c0544b2012-05-30 22:56:46 -04003408 sbi->s_sb = sb;
Theodore Ts'o240799c2008-10-09 23:53:47 -04003409 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
Miklos Szeredid9c9bef12007-10-16 23:26:27 -07003410 sbi->s_sb_block = sb_block;
Theodore Ts'of613dfc2010-07-27 11:56:08 -04003411 if (sb->s_bdev->bd_part)
3412 sbi->s_sectors_written_start =
3413 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003414
Theodore Ts'o9f6200b2008-09-23 09:18:24 -04003415 /* Cleanup superblock name */
Rasmus Villemoesec3904d2015-06-25 15:02:41 -07003416 strreplace(sb->s_id, '/', '!');
Theodore Ts'o9f6200b2008-09-23 09:18:24 -04003417
Lukas Czerner07aa2ea2012-11-08 15:16:54 -05003418 /* -EINVAL is default */
Cyrill Gorcunovdcc7dae2010-07-27 11:56:07 -04003419 ret = -EINVAL;
Mingming Cao617ba132006-10-11 01:20:53 -07003420 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003421 if (!blocksize) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003422 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003423 goto out_fail;
3424 }
3425
3426 /*
Mingming Cao617ba132006-10-11 01:20:53 -07003427 * The ext4 superblock will not be buffer aligned for other than 1kB
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003428 * block sizes. We need to calculate the offset from buffer start.
3429 */
Mingming Cao617ba132006-10-11 01:20:53 -07003430 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
Andrew Morton70bbb3e2006-10-11 01:21:20 -07003431 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3432 offset = do_div(logical_sb_block, blocksize);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003433 } else {
Andrew Morton70bbb3e2006-10-11 01:21:20 -07003434 logical_sb_block = sb_block;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003435 }
3436
Gioh Kima8ac9002014-09-04 22:36:15 -04003437 if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003438 ext4_msg(sb, KERN_ERR, "unable to read superblock");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003439 goto out_fail;
3440 }
3441 /*
3442 * Note: s_es must be initialized as soon as possible because
Mingming Cao617ba132006-10-11 01:20:53 -07003443 * some ext4 macro-instructions depend on its value
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003444 */
Theodore Ts'o2716b802012-05-28 17:47:52 -04003445 es = (struct ext4_super_block *) (bh->b_data + offset);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003446 sbi->s_es = es;
3447 sb->s_magic = le16_to_cpu(es->s_magic);
Mingming Cao617ba132006-10-11 01:20:53 -07003448 if (sb->s_magic != EXT4_SUPER_MAGIC)
3449 goto cantfind_ext4;
Theodore Ts'oafc32f72009-02-28 19:39:58 -05003450 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003451
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04003452 /* Warn if metadata_csum and gdt_csum are both set. */
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04003453 if (ext4_has_feature_metadata_csum(sb) &&
3454 ext4_has_feature_gdt_csum(sb))
Jakub Wilk363307e2015-01-02 15:31:14 -05003455 ext4_warning(sb, "metadata_csum and uninit_bg are "
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04003456 "redundant flags; please run fsck.");
3457
Darrick J. Wongd25425f2012-04-29 18:25:10 -04003458 /* Check for a known checksum algorithm */
3459 if (!ext4_verify_csum_type(sb, es)) {
3460 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3461 "unknown checksum algorithm.");
3462 silent = 1;
3463 goto cantfind_ext4;
3464 }
3465
Darrick J. Wong04419842012-04-29 18:27:10 -04003466 /* Load the checksum driver */
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04003467 if (ext4_has_feature_metadata_csum(sb)) {
Darrick J. Wong04419842012-04-29 18:27:10 -04003468 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3469 if (IS_ERR(sbi->s_chksum_driver)) {
3470 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3471 ret = PTR_ERR(sbi->s_chksum_driver);
3472 sbi->s_chksum_driver = NULL;
3473 goto failed_mount;
3474 }
3475 }
3476
Darrick J. Wonga9c473172012-04-29 18:29:10 -04003477 /* Check superblock checksum */
3478 if (!ext4_superblock_csum_verify(sb, es)) {
3479 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3480 "invalid superblock checksum. Run e2fsck?");
3481 silent = 1;
Darrick J. Wong6a797d22015-10-17 16:16:04 -04003482 ret = -EFSBADCRC;
Darrick J. Wonga9c473172012-04-29 18:29:10 -04003483 goto cantfind_ext4;
3484 }
3485
3486 /* Precompute checksum seed for all metadata */
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04003487 if (ext4_has_feature_csum_seed(sb))
Darrick J. Wong8c81bd82015-10-17 16:16:02 -04003488 sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
3489 else if (ext4_has_metadata_csum(sb))
Darrick J. Wonga9c473172012-04-29 18:29:10 -04003490 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3491 sizeof(es->s_uuid));
3492
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003493 /* Set defaults before we parse the mount options */
3494 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05003495 set_opt(sb, INIT_INODE_TABLE);
Mingming Cao617ba132006-10-11 01:20:53 -07003496 if (def_mount_opts & EXT4_DEFM_DEBUG)
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05003497 set_opt(sb, DEBUG);
Theodore Ts'o87f26802012-03-02 00:03:21 -05003498 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05003499 set_opt(sb, GRPID);
Mingming Cao617ba132006-10-11 01:20:53 -07003500 if (def_mount_opts & EXT4_DEFM_UID16)
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05003501 set_opt(sb, NO_UID32);
Eric Sandeenea663332011-02-23 17:51:51 -05003502 /* xattr user namespace & acls are now defaulted on */
Eric Sandeenea663332011-02-23 17:51:51 -05003503 set_opt(sb, XATTR_USER);
Theodore Ts'o03010a32008-10-10 20:02:48 -04003504#ifdef CONFIG_EXT4_FS_POSIX_ACL
Eric Sandeenea663332011-02-23 17:51:51 -05003505 set_opt(sb, POSIX_ACL);
Hugh Dickins2e7842b2007-02-10 01:46:13 -08003506#endif
Darrick J. Wong98c1a752014-10-30 10:53:16 -04003507 /* don't forget to enable journal_csum when metadata_csum is enabled. */
3508 if (ext4_has_metadata_csum(sb))
3509 set_opt(sb, JOURNAL_CHECKSUM);
3510
Mingming Cao617ba132006-10-11 01:20:53 -07003511 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05003512 set_opt(sb, JOURNAL_DATA);
Mingming Cao617ba132006-10-11 01:20:53 -07003513 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05003514 set_opt(sb, ORDERED_DATA);
Mingming Cao617ba132006-10-11 01:20:53 -07003515 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05003516 set_opt(sb, WRITEBACK_DATA);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003517
Mingming Cao617ba132006-10-11 01:20:53 -07003518 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05003519 set_opt(sb, ERRORS_PANIC);
Aneesh Kumar K.Vbb4f3972008-01-28 23:58:26 -05003520 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05003521 set_opt(sb, ERRORS_CONT);
Aneesh Kumar K.Vbb4f3972008-01-28 23:58:26 -05003522 else
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05003523 set_opt(sb, ERRORS_RO);
Darrick J. Wong45f1a9c2014-09-01 21:34:09 -04003524 /* block_validity enabled by default; disable with noblock_validity */
3525 set_opt(sb, BLOCK_VALIDITY);
Theodore Ts'o8b67f042010-08-01 23:14:20 -04003526 if (def_mount_opts & EXT4_DEFM_DISCARD)
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05003527 set_opt(sb, DISCARD);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003528
Eric W. Biederman08cefc72012-02-07 15:41:49 -08003529 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3530 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
Theodore Ts'o30773842009-01-03 20:27:38 -05003531 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3532 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3533 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003534
Theodore Ts'o8b67f042010-08-01 23:14:20 -04003535 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05003536 set_opt(sb, BARRIER);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003537
Mingming Cao1e2462f2007-07-18 09:00:55 -04003538 /*
Aneesh Kumar K.Vdd919b92008-07-11 19:27:31 -04003539 * enable delayed allocation by default
3540 * Use -o nodelalloc to turn it off
3541 */
Theodore Ts'obc0b75f2012-09-17 22:54:36 -04003542 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
Theodore Ts'o8b67f042010-08-01 23:14:20 -04003543 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05003544 set_opt(sb, DELALLOC);
Aneesh Kumar K.Vdd919b92008-07-11 19:27:31 -04003545
Lukas Czerner51ce6512011-05-20 13:55:16 -04003546 /*
3547 * set default s_li_wait_mult for lazyinit, for the case there is
3548 * no mount option specified.
3549 */
3550 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3551
Theodore Ts'o956e2a02016-11-18 13:24:26 -05003552 if (sbi->s_es->s_mount_opts[0]) {
3553 char *s_mount_opts = kstrndup(sbi->s_es->s_mount_opts,
3554 sizeof(sbi->s_es->s_mount_opts),
3555 GFP_KERNEL);
3556 if (!s_mount_opts)
3557 goto failed_mount;
3558 if (!parse_options(s_mount_opts, sb, &journal_devnum,
3559 &journal_ioprio, 0)) {
3560 ext4_msg(sb, KERN_WARNING,
3561 "failed to parse options in superblock: %s",
3562 s_mount_opts);
3563 }
3564 kfree(s_mount_opts);
Theodore Ts'o8b67f042010-08-01 23:14:20 -04003565 }
Theodore Ts'o5a916be2012-03-04 19:27:31 -05003566 sbi->s_def_mount_opt = sbi->s_mount_opt;
Theodore Ts'ob3881f72009-01-05 22:46:26 -05003567 if (!parse_options((char *) data, sb, &journal_devnum,
Eric Sandeen661aa522012-02-20 17:53:04 -05003568 &journal_ioprio, 0))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003569 goto failed_mount;
3570
Theodore Ts'o56889782011-09-03 18:22:38 -04003571 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3572 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3573 "with data=journal disables delayed "
3574 "allocation and O_DIRECT support!\n");
3575 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3576 ext4_msg(sb, KERN_ERR, "can't mount with "
3577 "both data=journal and delalloc");
3578 goto failed_mount;
3579 }
3580 if (test_opt(sb, DIOREAD_NOLOCK)) {
3581 ext4_msg(sb, KERN_ERR, "can't mount with "
Piotr Sarna6ae65142013-08-08 23:02:24 -04003582 "both data=journal and dioread_nolock");
Theodore Ts'o56889782011-09-03 18:22:38 -04003583 goto failed_mount;
3584 }
Ross Zwisler923ae0f2015-02-16 15:59:38 -08003585 if (test_opt(sb, DAX)) {
3586 ext4_msg(sb, KERN_ERR, "can't mount with "
3587 "both data=journal and dax");
3588 goto failed_mount;
3589 }
Sergey Karamov9abce3c2016-12-10 17:54:58 -05003590 if (ext4_has_feature_encrypt(sb)) {
3591 ext4_msg(sb, KERN_WARNING,
3592 "encrypted files will use data=ordered "
3593 "instead of data journaling mode");
3594 }
Theodore Ts'o56889782011-09-03 18:22:38 -04003595 if (test_opt(sb, DELALLOC))
3596 clear_opt(sb, DELALLOC);
Tejun Heo001e4a82015-07-21 23:51:26 -04003597 } else {
3598 sb->s_iflags |= SB_I_CGROUPWB;
Theodore Ts'o56889782011-09-03 18:22:38 -04003599 }
3600
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003601 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
Dmitry Monakhov482a7422010-02-24 11:35:32 -05003602 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003603
Mingming Cao617ba132006-10-11 01:20:53 -07003604 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04003605 (ext4_has_compat_features(sb) ||
3606 ext4_has_ro_compat_features(sb) ||
3607 ext4_has_incompat_features(sb)))
Eric Sandeenb31e1552009-06-04 17:36:36 -04003608 ext4_msg(sb, KERN_WARNING,
3609 "feature flags set on rev 0 fs, "
3610 "running e2fsck is recommended");
Theodore Tso469108f2008-02-10 01:11:44 -05003611
Theodore Ts'oed3654e2014-03-24 14:09:06 -04003612 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
3613 set_opt2(sb, HURD_COMPAT);
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04003614 if (ext4_has_feature_64bit(sb)) {
Theodore Ts'oed3654e2014-03-24 14:09:06 -04003615 ext4_msg(sb, KERN_ERR,
3616 "The Hurd can't support 64-bit file systems");
3617 goto failed_mount;
3618 }
3619 }
3620
Theodore Ts'o2035e772011-04-18 17:29:14 -04003621 if (IS_EXT2_SB(sb)) {
3622 if (ext2_feature_set_ok(sb))
3623 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3624 "using the ext4 subsystem");
3625 else {
3626 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3627 "to feature incompatibilities");
3628 goto failed_mount;
3629 }
3630 }
3631
3632 if (IS_EXT3_SB(sb)) {
3633 if (ext3_feature_set_ok(sb))
3634 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3635 "using the ext4 subsystem");
3636 else {
3637 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3638 "to feature incompatibilities");
3639 goto failed_mount;
3640 }
3641 }
3642
Theodore Tso469108f2008-02-10 01:11:44 -05003643 /*
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003644 * Check feature flags regardless of the revision level, since we
3645 * previously didn't change the revision level when setting the flags,
3646 * so there is a chance incompat flags are set on a rev 0 filesystem.
3647 */
Eric Sandeena13fb1a2009-08-18 00:20:23 -04003648 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003649 goto failed_mount;
Eric Sandeena13fb1a2009-08-18 00:20:23 -04003650
Jan Kara261cb20c2012-12-20 00:07:18 -05003651 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
Mingming Cao617ba132006-10-11 01:20:53 -07003652 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3653 blocksize > EXT4_MAX_BLOCK_SIZE) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003654 ext4_msg(sb, KERN_ERR,
Theodore Ts'o8cdf3372016-11-18 13:00:24 -05003655 "Unsupported filesystem blocksize %d (%d log_block_size)",
3656 blocksize, le32_to_cpu(es->s_log_block_size));
3657 goto failed_mount;
3658 }
3659 if (le32_to_cpu(es->s_log_block_size) >
3660 (EXT4_MAX_BLOCK_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
3661 ext4_msg(sb, KERN_ERR,
3662 "Invalid log block size: %u",
3663 le32_to_cpu(es->s_log_block_size));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003664 goto failed_mount;
3665 }
Theodore Ts'oeb13a422018-06-17 18:11:20 -04003666 if (le32_to_cpu(es->s_log_cluster_size) >
3667 (EXT4_MAX_CLUSTER_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
3668 ext4_msg(sb, KERN_ERR,
3669 "Invalid log cluster size: %u",
3670 le32_to_cpu(es->s_log_cluster_size));
3671 goto failed_mount;
3672 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003673
Theodore Ts'o5b9554d2016-07-05 20:01:52 -04003674 if (le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) > (blocksize / 4)) {
3675 ext4_msg(sb, KERN_ERR,
3676 "Number of reserved GDT blocks insanely large: %d",
3677 le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks));
3678 goto failed_mount;
3679 }
3680
Ross Zwisler923ae0f2015-02-16 15:59:38 -08003681 if (sbi->s_mount_opt & EXT4_MOUNT_DAX) {
Toshi Kani87eefeb2016-05-10 10:23:54 -06003682 err = bdev_dax_supported(sb, blocksize);
3683 if (err)
Ross Zwisler923ae0f2015-02-16 15:59:38 -08003684 goto failed_mount;
Ross Zwisler923ae0f2015-02-16 15:59:38 -08003685 }
3686
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04003687 if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
Theodore Ts'o6ddb2442015-04-16 01:56:00 -04003688 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
3689 es->s_encryption_level);
3690 goto failed_mount;
3691 }
3692
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003693 if (sb->s_blocksize != blocksize) {
Aneesh Kumar K.Vce407332008-01-28 23:58:27 -05003694 /* Validate the filesystem blocksize */
3695 if (!sb_set_blocksize(sb, blocksize)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003696 ext4_msg(sb, KERN_ERR, "bad block size %d",
Aneesh Kumar K.Vce407332008-01-28 23:58:27 -05003697 blocksize);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003698 goto failed_mount;
3699 }
3700
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04003701 brelse(bh);
Andrew Morton70bbb3e2006-10-11 01:21:20 -07003702 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3703 offset = do_div(logical_sb_block, blocksize);
Gioh Kima8ac9002014-09-04 22:36:15 -04003704 bh = sb_bread_unmovable(sb, logical_sb_block);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003705 if (!bh) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003706 ext4_msg(sb, KERN_ERR,
3707 "Can't read superblock on 2nd try");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003708 goto failed_mount;
3709 }
Theodore Ts'o2716b802012-05-28 17:47:52 -04003710 es = (struct ext4_super_block *)(bh->b_data + offset);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003711 sbi->s_es = es;
Mingming Cao617ba132006-10-11 01:20:53 -07003712 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003713 ext4_msg(sb, KERN_ERR,
3714 "Magic mismatch, very weird!");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003715 goto failed_mount;
3716 }
3717 }
3718
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04003719 has_huge_files = ext4_has_feature_huge_file(sb);
Theodore Ts'of287a1a2008-10-16 22:50:48 -04003720 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3721 has_huge_files);
3722 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003723
Mingming Cao617ba132006-10-11 01:20:53 -07003724 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3725 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3726 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003727 } else {
3728 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3729 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
Theodore Ts'o425dc462018-06-17 00:41:14 -04003730 if (sbi->s_first_ino < EXT4_GOOD_OLD_FIRST_INO) {
3731 ext4_msg(sb, KERN_ERR, "invalid first ino: %u",
3732 sbi->s_first_ino);
3733 goto failed_mount;
3734 }
Mingming Cao617ba132006-10-11 01:20:53 -07003735 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
Vignesh Babu13305932007-07-18 09:11:02 -04003736 (!is_power_of_2(sbi->s_inode_size)) ||
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003737 (sbi->s_inode_size > blocksize)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003738 ext4_msg(sb, KERN_ERR,
3739 "unsupported inode size: %d",
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04003740 sbi->s_inode_size);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003741 goto failed_mount;
3742 }
Kalpak Shahef7f3832007-07-18 09:15:20 -04003743 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3744 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003745 }
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04003746
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07003747 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04003748 if (ext4_has_feature_64bit(sb)) {
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07003749 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07003750 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
vignesh babud8ea6cf2007-10-16 23:27:14 -07003751 !is_power_of_2(sbi->s_desc_size)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003752 ext4_msg(sb, KERN_ERR,
3753 "unsupported descriptor size %lu",
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07003754 sbi->s_desc_size);
3755 goto failed_mount;
3756 }
3757 } else
3758 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04003759
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003760 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003761 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04003762
Mingming Cao617ba132006-10-11 01:20:53 -07003763 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003764 if (sbi->s_inodes_per_block == 0)
Mingming Cao617ba132006-10-11 01:20:53 -07003765 goto cantfind_ext4;
Theodore Ts'o01772f42016-11-18 13:28:30 -05003766 if (sbi->s_inodes_per_group < sbi->s_inodes_per_block ||
3767 sbi->s_inodes_per_group > blocksize * 8) {
3768 ext4_msg(sb, KERN_ERR, "invalid inodes per group: %lu\n",
3769 sbi->s_blocks_per_group);
3770 goto failed_mount;
3771 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003772 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3773 sbi->s_inodes_per_block;
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07003774 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003775 sbi->s_sbh = bh;
3776 sbi->s_mount_state = le16_to_cpu(es->s_state);
Fengguang Wue57aa832007-10-16 23:26:25 -07003777 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3778 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04003779
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04003780 for (i = 0; i < 4; i++)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003781 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3782 sbi->s_def_hash_version = es->s_def_hash_version;
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04003783 if (ext4_has_feature_dir_index(sb)) {
Theodore Ts'o23301412014-02-12 12:16:04 -05003784 i = le32_to_cpu(es->s_flags);
3785 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3786 sbi->s_hash_unsigned = 3;
3787 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
Theodore Ts'of99b2582008-10-28 13:21:44 -04003788#ifdef __CHAR_UNSIGNED__
Theodore Ts'o23301412014-02-12 12:16:04 -05003789 if (!(sb->s_flags & MS_RDONLY))
3790 es->s_flags |=
3791 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3792 sbi->s_hash_unsigned = 3;
Theodore Ts'of99b2582008-10-28 13:21:44 -04003793#else
Theodore Ts'o23301412014-02-12 12:16:04 -05003794 if (!(sb->s_flags & MS_RDONLY))
3795 es->s_flags |=
3796 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
Theodore Ts'of99b2582008-10-28 13:21:44 -04003797#endif
Theodore Ts'o23301412014-02-12 12:16:04 -05003798 }
Theodore Ts'of99b2582008-10-28 13:21:44 -04003799 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003800
Theodore Ts'o281b5992011-09-09 18:34:51 -04003801 /* Handle clustersize */
3802 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04003803 has_bigalloc = ext4_has_feature_bigalloc(sb);
Theodore Ts'o281b5992011-09-09 18:34:51 -04003804 if (has_bigalloc) {
3805 if (clustersize < blocksize) {
3806 ext4_msg(sb, KERN_ERR,
3807 "cluster size (%d) smaller than "
3808 "block size (%d)", clustersize, blocksize);
3809 goto failed_mount;
3810 }
3811 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3812 le32_to_cpu(es->s_log_block_size);
3813 sbi->s_clusters_per_group =
3814 le32_to_cpu(es->s_clusters_per_group);
3815 if (sbi->s_clusters_per_group > blocksize * 8) {
3816 ext4_msg(sb, KERN_ERR,
3817 "#clusters per group too big: %lu",
3818 sbi->s_clusters_per_group);
3819 goto failed_mount;
3820 }
3821 if (sbi->s_blocks_per_group !=
3822 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3823 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3824 "clusters per group (%lu) inconsistent",
3825 sbi->s_blocks_per_group,
3826 sbi->s_clusters_per_group);
3827 goto failed_mount;
3828 }
3829 } else {
3830 if (clustersize != blocksize) {
Theodore Ts'oeb13a422018-06-17 18:11:20 -04003831 ext4_msg(sb, KERN_ERR,
3832 "fragment/cluster size (%d) != "
3833 "block size (%d)", clustersize, blocksize);
3834 goto failed_mount;
Theodore Ts'o281b5992011-09-09 18:34:51 -04003835 }
3836 if (sbi->s_blocks_per_group > blocksize * 8) {
3837 ext4_msg(sb, KERN_ERR,
3838 "#blocks per group too big: %lu",
3839 sbi->s_blocks_per_group);
3840 goto failed_mount;
3841 }
3842 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3843 sbi->s_cluster_bits = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003844 }
Theodore Ts'o281b5992011-09-09 18:34:51 -04003845 sbi->s_cluster_ratio = clustersize / blocksize;
3846
Theodore Ts'o960fd8562013-07-05 23:11:16 -04003847 /* Do we have standard group size of clustersize * 8 blocks ? */
3848 if (sbi->s_blocks_per_group == clustersize << 3)
3849 set_opt2(sb, STD_GROUP_SIZE);
3850
Eric Sandeenbf43d842009-08-17 23:48:51 -04003851 /*
3852 * Test whether we have more sectors than will fit in sector_t,
3853 * and whether the max offset is addressable by the page cache.
3854 */
Darrick J. Wong5a9ae682010-11-19 09:56:44 -05003855 err = generic_check_addressable(sb->s_blocksize_bits,
Patrick J. LoPresti30ca22c2010-07-22 15:03:41 -07003856 ext4_blocks_count(es));
Darrick J. Wong5a9ae682010-11-19 09:56:44 -05003857 if (err) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003858 ext4_msg(sb, KERN_ERR, "filesystem"
Eric Sandeenbf43d842009-08-17 23:48:51 -04003859 " too large to mount safely on this system");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003860 if (sizeof(sector_t) < 8)
Bartlomiej Zolnierkiewicz90c699a2009-06-19 08:08:50 +02003861 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003862 goto failed_mount;
3863 }
3864
Mingming Cao617ba132006-10-11 01:20:53 -07003865 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3866 goto cantfind_ext4;
Eric Sandeene7c95592008-01-28 23:58:27 -05003867
From: Thiemo Nagel0f2ddca2009-04-07 14:07:47 -04003868 /* check blocks count against device size */
3869 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3870 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003871 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3872 "exceeds size of device (%llu blocks)",
From: Thiemo Nagel0f2ddca2009-04-07 14:07:47 -04003873 ext4_blocks_count(es), blocks_count);
3874 goto failed_mount;
3875 }
3876
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04003877 /*
3878 * It makes no sense for the first data block to be beyond the end
3879 * of the filesystem.
3880 */
3881 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
Zheng Liu5635a622011-12-18 16:13:58 -05003882 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
Eric Sandeenb31e1552009-06-04 17:36:36 -04003883 "block %u is beyond end of filesystem (%llu)",
3884 le32_to_cpu(es->s_first_data_block),
3885 ext4_blocks_count(es));
Eric Sandeene7c95592008-01-28 23:58:27 -05003886 goto failed_mount;
3887 }
Theodore Ts'oeb13a422018-06-17 18:11:20 -04003888 if ((es->s_first_data_block == 0) && (es->s_log_block_size == 0) &&
3889 (sbi->s_cluster_ratio == 1)) {
3890 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
3891 "block is 0 with a 1k block and cluster size");
3892 goto failed_mount;
3893 }
3894
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07003895 blocks_count = (ext4_blocks_count(es) -
3896 le32_to_cpu(es->s_first_data_block) +
3897 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3898 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
Theodore Ts'o4ec11022009-01-06 14:53:26 -05003899 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003900 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
Theodore Ts'o4ec11022009-01-06 14:53:26 -05003901 "(block count %llu, first data block %u, "
Eric Sandeenb31e1552009-06-04 17:36:36 -04003902 "blocks per group %lu)", sbi->s_groups_count,
Theodore Ts'o4ec11022009-01-06 14:53:26 -05003903 ext4_blocks_count(es),
3904 le32_to_cpu(es->s_first_data_block),
3905 EXT4_BLOCKS_PER_GROUP(sb));
3906 goto failed_mount;
3907 }
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07003908 sbi->s_groups_count = blocks_count;
Eric Sandeenfb0a3872009-09-16 14:45:10 -04003909 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3910 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
Theodore Ts'o8547ff52018-11-07 10:32:53 -05003911 if (((u64)sbi->s_groups_count * sbi->s_inodes_per_group) !=
3912 le32_to_cpu(es->s_inodes_count)) {
3913 ext4_msg(sb, KERN_ERR, "inodes count not valid: %u vs %llu",
3914 le32_to_cpu(es->s_inodes_count),
3915 ((u64)sbi->s_groups_count * sbi->s_inodes_per_group));
3916 ret = -EINVAL;
3917 goto failed_mount;
3918 }
Mingming Cao617ba132006-10-11 01:20:53 -07003919 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3920 EXT4_DESC_PER_BLOCK(sb);
Eryu Guan13e6ef92016-12-01 15:08:37 -05003921 if (ext4_has_feature_meta_bg(sb)) {
Theodore Ts'oc2eeabe2017-02-15 01:26:39 -05003922 if (le32_to_cpu(es->s_first_meta_bg) > db_count) {
Eryu Guan13e6ef92016-12-01 15:08:37 -05003923 ext4_msg(sb, KERN_WARNING,
3924 "first meta block group too large: %u "
3925 "(group descriptor block count %u)",
3926 le32_to_cpu(es->s_first_meta_bg), db_count);
3927 goto failed_mount;
3928 }
3929 }
Theodore Ts'of18a5f22011-08-01 08:45:38 -04003930 sbi->s_group_desc = ext4_kvmalloc(db_count *
3931 sizeof(struct buffer_head *),
3932 GFP_KERNEL);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003933 if (sbi->s_group_desc == NULL) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003934 ext4_msg(sb, KERN_ERR, "not enough memory");
Theodore Ts'o2cde4172012-05-28 17:49:54 -04003935 ret = -ENOMEM;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003936 goto failed_mount;
3937 }
3938
Pekka Enberg705895b2009-02-15 18:07:52 -05003939 bgl_lock_init(sbi->s_blockgroup_lock);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003940
3941 for (i = 0; i < db_count; i++) {
Andrew Morton70bbb3e2006-10-11 01:21:20 -07003942 block = descriptor_loc(sb, logical_sb_block, i);
Gioh Kima8ac9002014-09-04 22:36:15 -04003943 sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003944 if (!sbi->s_group_desc[i]) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003945 ext4_msg(sb, KERN_ERR,
3946 "can't read group descriptor %d", i);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003947 db_count = i;
3948 goto failed_mount2;
3949 }
3950 }
Theodore Ts'o9bf8d5b2018-07-08 19:35:02 -04003951 sbi->s_gdb_count = db_count;
Theodore Ts'o829fa702016-08-01 00:51:02 -04003952 if (!ext4_check_descriptors(sb, logical_sb_block, &first_not_zeroed)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003953 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
Darrick J. Wong6a797d22015-10-17 16:16:04 -04003954 ret = -EFSCORRUPTED;
Theodore Ts'of9ae9cf2014-07-11 13:55:40 -04003955 goto failed_mount2;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003956 }
Jose R. Santos772cb7c2008-07-11 19:27:31 -04003957
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003958 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3959 spin_lock_init(&sbi->s_next_gen_lock);
3960
Jan Mrazek04ecddb2015-01-26 14:42:31 -05003961 setup_timer(&sbi->s_err_report, print_daily_error_info,
3962 (unsigned long) sb);
Tao Ma04496412011-04-05 19:55:28 -04003963
Dmitry Monakhova75ae78f2013-04-03 22:10:52 -04003964 /* Register extent status tree shrinker */
Zheng Liueb68d0e2014-09-01 22:26:49 -04003965 if (ext4_es_register_shrinker(sbi))
Theodore Ts'oce7e0102010-11-03 12:03:21 -04003966 goto failed_mount3;
Theodore Ts'oce7e0102010-11-03 12:03:21 -04003967
Alex Tomasc9de5602008-01-29 00:19:52 -05003968 sbi->s_stripe = ext4_get_stripe_size(sbi);
Zheng Liu67a5da52012-08-17 09:54:17 -04003969 sbi->s_extent_max_zeroout_kb = 32;
Alex Tomasc9de5602008-01-29 00:19:52 -05003970
Theodore Ts'of9ae9cf2014-07-11 13:55:40 -04003971 /*
3972 * set up enough so that it can read an inode
3973 */
Theodore Ts'of6e63f92014-09-18 17:12:30 -04003974 sb->s_op = &ext4_sops;
Mingming Cao617ba132006-10-11 01:20:53 -07003975 sb->s_export_op = &ext4_export_ops;
3976 sb->s_xattr = ext4_xattr_handlers;
Jaegeuk Kima7550b32016-07-10 14:01:03 -04003977 sb->s_cop = &ext4_cryptops;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003978#ifdef CONFIG_QUOTA
Mingming Cao617ba132006-10-11 01:20:53 -07003979 sb->dq_op = &ext4_quota_operations;
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04003980 if (ext4_has_feature_quota(sb))
Jan Kara1fa5efe2014-10-08 18:26:54 +02003981 sb->s_qcop = &dquot_quotactl_sysfile_ops;
Jan Kara262b4662013-03-02 17:57:08 -05003982 else
3983 sb->s_qcop = &ext4_qctl_operations;
Li Xi689c9582016-01-08 16:01:22 -05003984 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003985#endif
Aneesh Kumar K.Vf2fa2ff2011-01-29 18:43:40 +05303986 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3987
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003988 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
Theodore Ts'o3b9d4ed2009-04-25 22:54:04 -04003989 mutex_init(&sbi->s_orphan_lock);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003990
3991 sb->s_root = NULL;
3992
3993 needs_recovery = (es->s_last_orphan != 0 ||
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04003994 ext4_has_feature_journal_needs_recovery(sb));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003995
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04003996 if (ext4_has_feature_mmp(sb) && !(sb->s_flags & MS_RDONLY))
Johann Lombardic5e06d12011-05-24 18:31:25 -04003997 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
Darrick J. Wong50460fe2014-10-30 10:53:16 -04003998 goto failed_mount3a;
Johann Lombardic5e06d12011-05-24 18:31:25 -04003999
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004000 /*
4001 * The first inode we look at is the journal inode. Don't try
4002 * root first: it may be modified in the journal!
4003 */
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04004004 if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
Theodore Ts'od6dcec92017-02-05 01:26:48 -05004005 err = ext4_load_journal(sb, es, journal_devnum);
4006 if (err)
Darrick J. Wong50460fe2014-10-30 10:53:16 -04004007 goto failed_mount3a;
Frank Mayhar03901312009-01-07 00:06:22 -05004008 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04004009 ext4_has_feature_journal_needs_recovery(sb)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004010 ext4_msg(sb, KERN_ERR, "required journal recovery "
4011 "suppressed and not mounted read-only");
Jiaying Zhang744692d2010-03-04 16:14:02 -05004012 goto failed_mount_wq;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004013 } else {
Dmitry Monakhov1e381f62015-10-18 23:50:26 -04004014 /* Nojournal mode, all journal mount options are illegal */
4015 if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) {
4016 ext4_msg(sb, KERN_ERR, "can't mount with "
4017 "journal_checksum, fs mounted w/o journal");
4018 goto failed_mount_wq;
4019 }
4020 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4021 ext4_msg(sb, KERN_ERR, "can't mount with "
4022 "journal_async_commit, fs mounted w/o journal");
4023 goto failed_mount_wq;
4024 }
4025 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
4026 ext4_msg(sb, KERN_ERR, "can't mount with "
4027 "commit=%lu, fs mounted w/o journal",
4028 sbi->s_commit_interval / HZ);
4029 goto failed_mount_wq;
4030 }
4031 if (EXT4_MOUNT_DATA_FLAGS &
4032 (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
4033 ext4_msg(sb, KERN_ERR, "can't mount with "
4034 "data=, fs mounted w/o journal");
4035 goto failed_mount_wq;
4036 }
Debabrata Banerjeed5258b82019-04-30 23:08:15 -04004037 sbi->s_def_mount_opt &= ~EXT4_MOUNT_JOURNAL_CHECKSUM;
Dmitry Monakhov1e381f62015-10-18 23:50:26 -04004038 clear_opt(sb, JOURNAL_CHECKSUM);
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05004039 clear_opt(sb, DATA_FLAGS);
Frank Mayhar03901312009-01-07 00:06:22 -05004040 sbi->s_journal = NULL;
4041 needs_recovery = 0;
4042 goto no_journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004043 }
4044
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04004045 if (ext4_has_feature_64bit(sb) &&
Jose R. Santoseb40a092007-07-18 08:37:25 -04004046 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
4047 JBD2_FEATURE_INCOMPAT_64BIT)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004048 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
Jiaying Zhang744692d2010-03-04 16:14:02 -05004049 goto failed_mount_wq;
Jose R. Santoseb40a092007-07-18 08:37:25 -04004050 }
4051
Darrick J. Wong25ed6e82012-05-27 07:48:56 -04004052 if (!set_journal_csum_feature_set(sb)) {
4053 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
4054 "feature set");
4055 goto failed_mount_wq;
Linus Torvaldsd4da6c92009-11-02 10:15:27 -08004056 }
Girish Shilamkar818d2762008-01-28 23:58:27 -05004057
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004058 /* We have now updated the journal if required, so we can
4059 * validate the data journaling mode. */
4060 switch (test_opt(sb, DATA_FLAGS)) {
4061 case 0:
4062 /* No mode set, assume a default based on the journal
Andrew Morton63f57932006-10-11 01:21:24 -07004063 * capabilities: ORDERED_DATA if the journal can
4064 * cope, else JOURNAL_DATA
4065 */
Mingming Caodab291a2006-10-11 01:21:01 -07004066 if (jbd2_journal_check_available_features
4067 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05004068 set_opt(sb, ORDERED_DATA);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004069 else
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05004070 set_opt(sb, JOURNAL_DATA);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004071 break;
4072
Mingming Cao617ba132006-10-11 01:20:53 -07004073 case EXT4_MOUNT_ORDERED_DATA:
4074 case EXT4_MOUNT_WRITEBACK_DATA:
Mingming Caodab291a2006-10-11 01:21:01 -07004075 if (!jbd2_journal_check_available_features
4076 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004077 ext4_msg(sb, KERN_ERR, "Journal does not support "
4078 "requested data journaling mode");
Jiaying Zhang744692d2010-03-04 16:14:02 -05004079 goto failed_mount_wq;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004080 }
4081 default:
4082 break;
4083 }
Theodore Ts'ob3881f72009-01-05 22:46:26 -05004084 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004085
Bobi Jam18aadd42012-02-20 17:53:02 -05004086 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
4087
Theodore Ts'oce7e0102010-11-03 12:03:21 -04004088no_journal:
Andreas Gruenbacher2335d052016-02-22 22:41:05 -05004089 sbi->s_mb_cache = ext4_xattr_create_cache();
4090 if (!sbi->s_mb_cache) {
4091 ext4_msg(sb, KERN_ERR, "Failed to create an mb_cache");
4092 goto failed_mount_wq;
T Makphaibulchoke9c191f72014-03-18 19:24:49 -04004093 }
4094
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04004095 if ((DUMMY_ENCRYPTION_ENABLED(sbi) || ext4_has_feature_encrypt(sb)) &&
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +03004096 (blocksize != PAGE_SIZE)) {
Theodore Ts'o1cb767c2015-06-12 23:44:33 -04004097 ext4_msg(sb, KERN_ERR,
4098 "Unsupported blocksize for fs encryption");
4099 goto failed_mount_wq;
4100 }
4101
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04004102 if (DUMMY_ENCRYPTION_ENABLED(sbi) && !(sb->s_flags & MS_RDONLY) &&
4103 !ext4_has_feature_encrypt(sb)) {
4104 ext4_set_feature_encrypt(sb);
Theodore Ts'o6ddb2442015-04-16 01:56:00 -04004105 ext4_commit_super(sb, 1);
4106 }
4107
Tejun Heofd89d5f2011-02-01 11:42:42 +01004108 /*
Theodore Ts'o952fc182012-07-09 16:27:05 -04004109 * Get the # of file system overhead blocks from the
4110 * superblock if present.
4111 */
4112 if (es->s_overhead_clusters)
4113 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
4114 else {
Lukas Czerner07aa2ea2012-11-08 15:16:54 -05004115 err = ext4_calculate_overhead(sb);
4116 if (err)
Theodore Ts'o952fc182012-07-09 16:27:05 -04004117 goto failed_mount_wq;
4118 }
4119
4120 /*
Tejun Heofd89d5f2011-02-01 11:42:42 +01004121 * The maximum number of concurrent works can be high and
4122 * concurrency isn't really necessary. Limit it to 1.
4123 */
Jan Kara2e8fa542013-06-04 14:21:02 -04004124 EXT4_SB(sb)->rsv_conversion_wq =
4125 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4126 if (!EXT4_SB(sb)->rsv_conversion_wq) {
4127 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
Lukas Czerner07aa2ea2012-11-08 15:16:54 -05004128 ret = -ENOMEM;
Jan Kara2e8fa542013-06-04 14:21:02 -04004129 goto failed_mount4;
4130 }
4131
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004132 /*
Mingming Caodab291a2006-10-11 01:21:01 -07004133 * The jbd2_journal_load will have done any necessary log recovery,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004134 * so we can safely mount the rest of the filesystem now.
4135 */
4136
David Howells1d1fe1e2008-02-07 00:15:37 -08004137 root = ext4_iget(sb, EXT4_ROOT_INO);
4138 if (IS_ERR(root)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004139 ext4_msg(sb, KERN_ERR, "get root inode failed");
David Howells1d1fe1e2008-02-07 00:15:37 -08004140 ret = PTR_ERR(root);
Manish Katiyar32a9bb52011-02-27 20:42:06 -05004141 root = NULL;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004142 goto failed_mount4;
4143 }
4144 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004145 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
Al Viro94bf6082012-01-09 15:53:24 -05004146 iput(root);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004147 goto failed_mount4;
4148 }
Al Viro48fde702012-01-08 22:15:13 -05004149 sb->s_root = d_make_root(root);
David Howells1d1fe1e2008-02-07 00:15:37 -08004150 if (!sb->s_root) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004151 ext4_msg(sb, KERN_ERR, "get root dentry failed");
David Howells1d1fe1e2008-02-07 00:15:37 -08004152 ret = -ENOMEM;
4153 goto failed_mount4;
4154 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004155
Eric Sandeen7e84b622012-05-28 14:17:25 -04004156 if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
4157 sb->s_flags |= MS_RDONLY;
Kalpak Shahef7f3832007-07-18 09:15:20 -04004158
4159 /* determine the minimum size of new large inodes, if present */
4160 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
4161 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4162 EXT4_GOOD_OLD_INODE_SIZE;
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04004163 if (ext4_has_feature_extra_isize(sb)) {
Kalpak Shahef7f3832007-07-18 09:15:20 -04004164 if (sbi->s_want_extra_isize <
4165 le16_to_cpu(es->s_want_extra_isize))
4166 sbi->s_want_extra_isize =
4167 le16_to_cpu(es->s_want_extra_isize);
4168 if (sbi->s_want_extra_isize <
4169 le16_to_cpu(es->s_min_extra_isize))
4170 sbi->s_want_extra_isize =
4171 le16_to_cpu(es->s_min_extra_isize);
4172 }
4173 }
4174 /* Check if enough inode space is available */
4175 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
4176 sbi->s_inode_size) {
4177 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4178 EXT4_GOOD_OLD_INODE_SIZE;
Eric Sandeenb31e1552009-06-04 17:36:36 -04004179 ext4_msg(sb, KERN_INFO, "required extra inode space not"
4180 "available");
Kalpak Shahef7f3832007-07-18 09:15:20 -04004181 }
4182
Theodore Ts'ob5799012015-09-23 12:44:17 -04004183 ext4_set_resv_clusters(sb);
Lukas Czerner27dd4382013-04-09 22:11:22 -04004184
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04004185 err = ext4_setup_system_zone(sb);
4186 if (err) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004187 ext4_msg(sb, KERN_ERR, "failed to initialize system "
Curt Wohlgemuthfbe845d2010-05-16 13:00:00 -04004188 "zone (%d)", err);
Theodore Ts'of9ae9cf2014-07-11 13:55:40 -04004189 goto failed_mount4a;
4190 }
4191
4192 ext4_ext_init(sb);
4193 err = ext4_mb_init(sb);
4194 if (err) {
4195 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
4196 err);
Tao Madcf2d802011-10-06 12:10:11 -04004197 goto failed_mount5;
Aneesh Kumar K.Vc2774d82008-10-10 20:07:20 -04004198 }
4199
Theodore Ts'od5e03cb2014-07-15 06:01:38 -04004200 block = ext4_count_free_clusters(sb);
4201 ext4_free_blocks_count_set(sbi->s_es,
4202 EXT4_C2B(sbi, block));
Theodore Ts'o67770b42018-09-01 14:42:14 -04004203 ext4_superblock_csum_set(sb);
Tejun Heo908c7f12014-09-08 09:51:29 +09004204 err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
4205 GFP_KERNEL);
Theodore Ts'od5e03cb2014-07-15 06:01:38 -04004206 if (!err) {
4207 unsigned long freei = ext4_count_free_inodes(sb);
4208 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
Theodore Ts'o67770b42018-09-01 14:42:14 -04004209 ext4_superblock_csum_set(sb);
Tejun Heo908c7f12014-09-08 09:51:29 +09004210 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
4211 GFP_KERNEL);
Theodore Ts'od5e03cb2014-07-15 06:01:38 -04004212 }
4213 if (!err)
4214 err = percpu_counter_init(&sbi->s_dirs_counter,
Tejun Heo908c7f12014-09-08 09:51:29 +09004215 ext4_count_dirs(sb), GFP_KERNEL);
Theodore Ts'od5e03cb2014-07-15 06:01:38 -04004216 if (!err)
Tejun Heo908c7f12014-09-08 09:51:29 +09004217 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
4218 GFP_KERNEL);
Daeho Jeongc8585c62016-04-25 23:22:35 -04004219 if (!err)
4220 err = percpu_init_rwsem(&sbi->s_journal_flag_rwsem);
4221
Theodore Ts'od5e03cb2014-07-15 06:01:38 -04004222 if (err) {
4223 ext4_msg(sb, KERN_ERR, "insufficient memory");
4224 goto failed_mount6;
4225 }
4226
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04004227 if (ext4_has_feature_flex_bg(sb))
Theodore Ts'od5e03cb2014-07-15 06:01:38 -04004228 if (!ext4_fill_flex_info(sb)) {
4229 ext4_msg(sb, KERN_ERR,
4230 "unable to initialize "
4231 "flex_bg meta info!");
4232 goto failed_mount6;
4233 }
4234
Lukas Czernerbfff6872010-10-27 21:30:05 -04004235 err = ext4_register_li_request(sb, first_not_zeroed);
4236 if (err)
Tao Madcf2d802011-10-06 12:10:11 -04004237 goto failed_mount6;
Lukas Czernerbfff6872010-10-27 21:30:05 -04004238
Theodore Ts'ob5799012015-09-23 12:44:17 -04004239 err = ext4_register_sysfs(sb);
Tao Madcf2d802011-10-06 12:10:11 -04004240 if (err)
4241 goto failed_mount7;
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04004242
Jan Kara9b2ff3572013-03-02 18:22:38 -05004243#ifdef CONFIG_QUOTA
4244 /* Enable quota usage during mount. */
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04004245 if (ext4_has_feature_quota(sb) && !(sb->s_flags & MS_RDONLY)) {
Jan Kara9b2ff3572013-03-02 18:22:38 -05004246 err = ext4_enable_quotas(sb);
4247 if (err)
4248 goto failed_mount8;
4249 }
4250#endif /* CONFIG_QUOTA */
4251
Mingming Cao617ba132006-10-11 01:20:53 -07004252 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
4253 ext4_orphan_cleanup(sb, es);
4254 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
Frank Mayhar03901312009-01-07 00:06:22 -05004255 if (needs_recovery) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004256 ext4_msg(sb, KERN_INFO, "recovery complete");
Frank Mayhar03901312009-01-07 00:06:22 -05004257 ext4_mark_recovery_complete(sb, es);
4258 }
4259 if (EXT4_SB(sb)->s_journal) {
4260 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
4261 descr = " journalled data mode";
4262 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
4263 descr = " ordered data mode";
4264 else
4265 descr = " writeback data mode";
4266 } else
4267 descr = "out journal";
4268
Lukas Czerner79add3a2012-11-08 13:28:29 -05004269 if (test_opt(sb, DISCARD)) {
4270 struct request_queue *q = bdev_get_queue(sb->s_bdev);
4271 if (!blk_queue_discard(q))
4272 ext4_msg(sb, KERN_WARNING,
4273 "mounting with \"discard\" option, but "
4274 "the device does not support discard");
4275 }
4276
Theodore Ts'oe294a532015-08-15 14:59:44 -04004277 if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
4278 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
Theodore Ts'o956e2a02016-11-18 13:24:26 -05004279 "Opts: %.*s%s%s", descr,
4280 (int) sizeof(sbi->s_es->s_mount_opts),
4281 sbi->s_es->s_mount_opts,
Theodore Ts'oe294a532015-08-15 14:59:44 -04004282 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004283
Theodore Ts'o66e61a92010-07-27 11:56:04 -04004284 if (es->s_error_count)
4285 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004286
Theodore Ts'oefbed4d2013-10-17 21:11:01 -04004287 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
4288 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
4289 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
4290 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
4291
Curt Wohlgemuthd4c402d2010-05-16 12:00:00 -04004292 kfree(orig_data);
Jaegeuk Kima7550b32016-07-10 14:01:03 -04004293#ifdef CONFIG_EXT4_FS_ENCRYPTION
4294 memcpy(sbi->key_prefix, EXT4_KEY_DESC_PREFIX,
4295 EXT4_KEY_DESC_PREFIX_SIZE);
4296 sbi->key_prefix_size = EXT4_KEY_DESC_PREFIX_SIZE;
4297#endif
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004298 return 0;
4299
Mingming Cao617ba132006-10-11 01:20:53 -07004300cantfind_ext4:
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004301 if (!silent)
Eric Sandeenb31e1552009-06-04 17:36:36 -04004302 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004303 goto failed_mount;
4304
Theodore Ts'o72ba7452013-01-24 23:24:54 -05004305#ifdef CONFIG_QUOTA
4306failed_mount8:
Theodore Ts'oebd173b2015-09-23 12:46:17 -04004307 ext4_unregister_sysfs(sb);
Theodore Ts'o72ba7452013-01-24 23:24:54 -05004308#endif
Tao Madcf2d802011-10-06 12:10:11 -04004309failed_mount7:
4310 ext4_unregister_li_request(sb);
4311failed_mount6:
Theodore Ts'of9ae9cf2014-07-11 13:55:40 -04004312 ext4_mb_release(sb);
Theodore Ts'od5e03cb2014-07-15 06:01:38 -04004313 if (sbi->s_flex_groups)
Al Virob93b41d2014-11-20 12:19:11 -05004314 kvfree(sbi->s_flex_groups);
Theodore Ts'od5e03cb2014-07-15 06:01:38 -04004315 percpu_counter_destroy(&sbi->s_freeclusters_counter);
4316 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4317 percpu_counter_destroy(&sbi->s_dirs_counter);
4318 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
Vasily Averin6b436fb2018-11-07 10:56:28 -05004319 percpu_free_rwsem(&sbi->s_journal_flag_rwsem);
Azat Khuzhin00764932014-04-07 10:54:20 -04004320failed_mount5:
Theodore Ts'of9ae9cf2014-07-11 13:55:40 -04004321 ext4_ext_release(sb);
4322 ext4_release_system_zone(sb);
4323failed_mount4a:
Al Viro94bf6082012-01-09 15:53:24 -05004324 dput(sb->s_root);
Manish Katiyar32a9bb52011-02-27 20:42:06 -05004325 sb->s_root = NULL;
Al Viro94bf6082012-01-09 15:53:24 -05004326failed_mount4:
Eric Sandeenb31e1552009-06-04 17:36:36 -04004327 ext4_msg(sb, KERN_ERR, "mount failed");
Jan Kara2e8fa542013-06-04 14:21:02 -04004328 if (EXT4_SB(sb)->rsv_conversion_wq)
4329 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
Mingming Cao4c0425f2009-09-28 15:48:41 -04004330failed_mount_wq:
Jan Kara82939d72016-02-22 11:50:13 -05004331 if (sbi->s_mb_cache) {
4332 ext4_xattr_destroy_cache(sbi->s_mb_cache);
4333 sbi->s_mb_cache = NULL;
4334 }
Frank Mayhar03901312009-01-07 00:06:22 -05004335 if (sbi->s_journal) {
4336 jbd2_journal_destroy(sbi->s_journal);
4337 sbi->s_journal = NULL;
4338 }
Darrick J. Wong50460fe2014-10-30 10:53:16 -04004339failed_mount3a:
Zheng Liud3922a72013-07-01 08:12:37 -04004340 ext4_es_unregister_shrinker(sbi);
Zheng Liueb68d0e2014-09-01 22:26:49 -04004341failed_mount3:
Al Viro9105bb12013-12-08 20:52:31 -05004342 del_timer_sync(&sbi->s_err_report);
Johann Lombardic5e06d12011-05-24 18:31:25 -04004343 if (sbi->s_mmp_tsk)
4344 kthread_stop(sbi->s_mmp_tsk);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004345failed_mount2:
4346 for (i = 0; i < db_count; i++)
4347 brelse(sbi->s_group_desc[i]);
Al Virob93b41d2014-11-20 12:19:11 -05004348 kvfree(sbi->s_group_desc);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004349failed_mount:
Darrick J. Wong04419842012-04-29 18:27:10 -04004350 if (sbi->s_chksum_driver)
4351 crypto_free_shash(sbi->s_chksum_driver);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004352#ifdef CONFIG_QUOTA
Jan Karaa2d4a642014-09-11 11:15:15 -04004353 for (i = 0; i < EXT4_MAXQUOTAS; i++)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004354 kfree(sbi->s_qf_names[i]);
4355#endif
Mingming Cao617ba132006-10-11 01:20:53 -07004356 ext4_blkdev_remove(sbi);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004357 brelse(bh);
4358out_fail:
4359 sb->s_fs_info = NULL;
Manish Katiyarf6830162009-05-17 23:52:44 -04004360 kfree(sbi->s_blockgroup_lock);
Theodore Ts'o956e2a02016-11-18 13:24:26 -05004361out_free_base:
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004362 kfree(sbi);
Curt Wohlgemuthd4c402d2010-05-16 12:00:00 -04004363 kfree(orig_data);
Lukas Czerner07aa2ea2012-11-08 15:16:54 -05004364 return err ? err : ret;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004365}
4366
4367/*
4368 * Setup any per-fs journal parameters now. We'll do this both on
4369 * initial mount, once the journal has been initialised but before we've
4370 * done any recovery; and again on any subsequent remount.
4371 */
Mingming Cao617ba132006-10-11 01:20:53 -07004372static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004373{
Mingming Cao617ba132006-10-11 01:20:53 -07004374 struct ext4_sb_info *sbi = EXT4_SB(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004375
Theodore Ts'o30773842009-01-03 20:27:38 -05004376 journal->j_commit_interval = sbi->s_commit_interval;
4377 journal->j_min_batch_time = sbi->s_min_batch_time;
4378 journal->j_max_batch_time = sbi->s_max_batch_time;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004379
Theodore Ts'oa931da62010-08-03 21:35:12 -04004380 write_lock(&journal->j_state_lock);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004381 if (test_opt(sb, BARRIER))
Mingming Caodab291a2006-10-11 01:21:01 -07004382 journal->j_flags |= JBD2_BARRIER;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004383 else
Mingming Caodab291a2006-10-11 01:21:01 -07004384 journal->j_flags &= ~JBD2_BARRIER;
Hidehiro Kawai5bf56832008-10-10 22:12:43 -04004385 if (test_opt(sb, DATA_ERR_ABORT))
4386 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4387 else
4388 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
Theodore Ts'oa931da62010-08-03 21:35:12 -04004389 write_unlock(&journal->j_state_lock);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004390}
4391
Eric Whitneyc6cb7e72016-09-30 02:05:09 -04004392static struct inode *ext4_get_journal_inode(struct super_block *sb,
4393 unsigned int journal_inum)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004394{
4395 struct inode *journal_inode;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004396
Eric Whitneyc6cb7e72016-09-30 02:05:09 -04004397 /*
4398 * Test for the existence of a valid inode on disk. Bad things
4399 * happen if we iget() an unused inode, as the subsequent iput()
4400 * will try to delete it.
4401 */
David Howells1d1fe1e2008-02-07 00:15:37 -08004402 journal_inode = ext4_iget(sb, journal_inum);
4403 if (IS_ERR(journal_inode)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004404 ext4_msg(sb, KERN_ERR, "no journal found");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004405 return NULL;
4406 }
4407 if (!journal_inode->i_nlink) {
4408 make_bad_inode(journal_inode);
4409 iput(journal_inode);
Eric Sandeenb31e1552009-06-04 17:36:36 -04004410 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004411 return NULL;
4412 }
4413
Theodore Ts'oe5f8eab82008-09-08 22:25:04 -04004414 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004415 journal_inode, journal_inode->i_size);
David Howells1d1fe1e2008-02-07 00:15:37 -08004416 if (!S_ISREG(journal_inode->i_mode)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004417 ext4_msg(sb, KERN_ERR, "invalid journal inode");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004418 iput(journal_inode);
4419 return NULL;
4420 }
Eric Whitneyc6cb7e72016-09-30 02:05:09 -04004421 return journal_inode;
4422}
4423
4424static journal_t *ext4_get_journal(struct super_block *sb,
4425 unsigned int journal_inum)
4426{
4427 struct inode *journal_inode;
4428 journal_t *journal;
4429
4430 BUG_ON(!ext4_has_feature_journal(sb));
4431
4432 journal_inode = ext4_get_journal_inode(sb, journal_inum);
4433 if (!journal_inode)
4434 return NULL;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004435
Mingming Caodab291a2006-10-11 01:21:01 -07004436 journal = jbd2_journal_init_inode(journal_inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004437 if (!journal) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004438 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004439 iput(journal_inode);
4440 return NULL;
4441 }
4442 journal->j_private = sb;
Mingming Cao617ba132006-10-11 01:20:53 -07004443 ext4_init_journal_params(sb, journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004444 return journal;
4445}
4446
Mingming Cao617ba132006-10-11 01:20:53 -07004447static journal_t *ext4_get_dev_journal(struct super_block *sb,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004448 dev_t j_dev)
4449{
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04004450 struct buffer_head *bh;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004451 journal_t *journal;
Mingming Cao617ba132006-10-11 01:20:53 -07004452 ext4_fsblk_t start;
4453 ext4_fsblk_t len;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004454 int hblock, blocksize;
Mingming Cao617ba132006-10-11 01:20:53 -07004455 ext4_fsblk_t sb_block;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004456 unsigned long offset;
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04004457 struct ext4_super_block *es;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004458 struct block_device *bdev;
4459
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04004460 BUG_ON(!ext4_has_feature_journal(sb));
Frank Mayhar03901312009-01-07 00:06:22 -05004461
Eric Sandeenb31e1552009-06-04 17:36:36 -04004462 bdev = ext4_blkdev_get(j_dev, sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004463 if (bdev == NULL)
4464 return NULL;
4465
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004466 blocksize = sb->s_blocksize;
Martin K. Petersene1defc42009-05-22 17:17:49 -04004467 hblock = bdev_logical_block_size(bdev);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004468 if (blocksize < hblock) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004469 ext4_msg(sb, KERN_ERR,
4470 "blocksize too small for journal device");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004471 goto out_bdev;
4472 }
4473
Mingming Cao617ba132006-10-11 01:20:53 -07004474 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4475 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004476 set_blocksize(bdev, blocksize);
4477 if (!(bh = __bread(bdev, sb_block, blocksize))) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004478 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4479 "external journal");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004480 goto out_bdev;
4481 }
4482
Theodore Ts'o2716b802012-05-28 17:47:52 -04004483 es = (struct ext4_super_block *) (bh->b_data + offset);
Mingming Cao617ba132006-10-11 01:20:53 -07004484 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004485 !(le32_to_cpu(es->s_feature_incompat) &
Mingming Cao617ba132006-10-11 01:20:53 -07004486 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004487 ext4_msg(sb, KERN_ERR, "external journal has "
4488 "bad superblock");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004489 brelse(bh);
4490 goto out_bdev;
4491 }
4492
Darrick J. Wongdf4763b2014-09-11 11:44:36 -04004493 if ((le32_to_cpu(es->s_feature_ro_compat) &
4494 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
4495 es->s_checksum != ext4_superblock_csum(sb, es)) {
4496 ext4_msg(sb, KERN_ERR, "external journal has "
4497 "corrupt superblock");
4498 brelse(bh);
4499 goto out_bdev;
4500 }
4501
Mingming Cao617ba132006-10-11 01:20:53 -07004502 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004503 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004504 brelse(bh);
4505 goto out_bdev;
4506 }
4507
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07004508 len = ext4_blocks_count(es);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004509 start = sb_block + 1;
4510 brelse(bh); /* we're done with the superblock */
4511
Mingming Caodab291a2006-10-11 01:21:01 -07004512 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004513 start, len, blocksize);
4514 if (!journal) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004515 ext4_msg(sb, KERN_ERR, "failed to create device journal");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004516 goto out_bdev;
4517 }
4518 journal->j_private = sb;
Mike Christiedfec8a12016-06-05 14:31:44 -05004519 ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004520 wait_on_buffer(journal->j_sb_buffer);
4521 if (!buffer_uptodate(journal->j_sb_buffer)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004522 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004523 goto out_journal;
4524 }
4525 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004526 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4527 "user (unsupported) - %d",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004528 be32_to_cpu(journal->j_superblock->s_nr_users));
4529 goto out_journal;
4530 }
Mingming Cao617ba132006-10-11 01:20:53 -07004531 EXT4_SB(sb)->journal_bdev = bdev;
4532 ext4_init_journal_params(sb, journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004533 return journal;
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04004534
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004535out_journal:
Mingming Caodab291a2006-10-11 01:21:01 -07004536 jbd2_journal_destroy(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004537out_bdev:
Mingming Cao617ba132006-10-11 01:20:53 -07004538 ext4_blkdev_put(bdev);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004539 return NULL;
4540}
4541
Mingming Cao617ba132006-10-11 01:20:53 -07004542static int ext4_load_journal(struct super_block *sb,
4543 struct ext4_super_block *es,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004544 unsigned long journal_devnum)
4545{
4546 journal_t *journal;
4547 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4548 dev_t journal_dev;
4549 int err = 0;
4550 int really_read_only;
4551
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04004552 BUG_ON(!ext4_has_feature_journal(sb));
Frank Mayhar03901312009-01-07 00:06:22 -05004553
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004554 if (journal_devnum &&
4555 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004556 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4557 "numbers have changed");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004558 journal_dev = new_decode_dev(journal_devnum);
4559 } else
4560 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4561
4562 really_read_only = bdev_read_only(sb->s_bdev);
4563
4564 /*
4565 * Are we loading a blank journal or performing recovery after a
4566 * crash? For recovery, we need to check in advance whether we
4567 * can get read-write access to the device.
4568 */
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04004569 if (ext4_has_feature_journal_needs_recovery(sb)) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004570 if (sb->s_flags & MS_RDONLY) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004571 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4572 "required on readonly filesystem");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004573 if (really_read_only) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004574 ext4_msg(sb, KERN_ERR, "write access "
4575 "unavailable, cannot proceed");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004576 return -EROFS;
4577 }
Eric Sandeenb31e1552009-06-04 17:36:36 -04004578 ext4_msg(sb, KERN_INFO, "write access will "
4579 "be enabled during recovery");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004580 }
4581 }
4582
4583 if (journal_inum && journal_dev) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004584 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4585 "and inode journals!");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004586 return -EINVAL;
4587 }
4588
4589 if (journal_inum) {
Mingming Cao617ba132006-10-11 01:20:53 -07004590 if (!(journal = ext4_get_journal(sb, journal_inum)))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004591 return -EINVAL;
4592 } else {
Mingming Cao617ba132006-10-11 01:20:53 -07004593 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004594 return -EINVAL;
4595 }
4596
Theodore Ts'o90576c02009-09-29 15:51:30 -04004597 if (!(journal->j_flags & JBD2_BARRIER))
Eric Sandeenb31e1552009-06-04 17:36:36 -04004598 ext4_msg(sb, KERN_INFO, "barriers disabled");
Theodore Ts'o4776004f2008-09-08 23:00:52 -04004599
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04004600 if (!ext4_has_feature_journal_needs_recovery(sb))
Mingming Caodab291a2006-10-11 01:21:01 -07004601 err = jbd2_journal_wipe(journal, !really_read_only);
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -04004602 if (!err) {
4603 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4604 if (save)
4605 memcpy(save, ((char *) es) +
4606 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
Mingming Caodab291a2006-10-11 01:21:01 -07004607 err = jbd2_journal_load(journal);
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -04004608 if (save)
4609 memcpy(((char *) es) + EXT4_S_ERR_START,
4610 save, EXT4_S_ERR_LEN);
4611 kfree(save);
4612 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004613
4614 if (err) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004615 ext4_msg(sb, KERN_ERR, "error loading journal");
Mingming Caodab291a2006-10-11 01:21:01 -07004616 jbd2_journal_destroy(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004617 return err;
4618 }
4619
Mingming Cao617ba132006-10-11 01:20:53 -07004620 EXT4_SB(sb)->s_journal = journal;
4621 ext4_clear_journal_err(sb, es);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004622
Maciej Żenczykowskic41303c2010-10-27 21:30:06 -04004623 if (!really_read_only && journal_devnum &&
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004624 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4625 es->s_journal_dev = cpu_to_le32(journal_devnum);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004626
4627 /* Make sure we flush the recovery flag to disk. */
Theodore Ts'oe2d67052009-05-01 00:33:44 -04004628 ext4_commit_super(sb, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004629 }
4630
4631 return 0;
4632}
4633
Theodore Ts'oe2d67052009-05-01 00:33:44 -04004634static int ext4_commit_super(struct super_block *sb, int sync)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004635{
Theodore Ts'oe2d67052009-05-01 00:33:44 -04004636 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
Mingming Cao617ba132006-10-11 01:20:53 -07004637 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
Takashi Satoc4be0c12009-01-09 16:40:58 -08004638 int error = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004639
Theodore Ts'obdfe0cbd2015-08-16 10:03:57 -04004640 if (!sbh || block_device_ejected(sb))
Takashi Satoc4be0c12009-01-09 16:40:58 -08004641 return error;
Jon Derrick917692c2018-07-02 18:45:18 -04004642
4643 /*
4644 * The superblock bh should be mapped, but it might not be if the
4645 * device was hot-removed. Not much we can do but fail the I/O.
4646 */
4647 if (!buffer_mapped(sbh))
4648 return error;
4649
Theodore Ts'o71290b32009-09-10 17:31:04 -04004650 /*
4651 * If the file system is mounted read-only, don't update the
4652 * superblock write time. This avoids updating the superblock
4653 * write time when we are mounting the root file system
4654 * read/only but we need to replay the journal; at that point,
4655 * for people who are east of GMT and who make their clock
4656 * tick in localtime for Windows bug-for-bug compatibility,
4657 * the clock is set in the future, and this will cause e2fsck
4658 * to complain and force a full file system check.
4659 */
4660 if (!(sb->s_flags & MS_RDONLY))
4661 es->s_wtime = cpu_to_le32(get_seconds());
Theodore Ts'of613dfc2010-07-27 11:56:08 -04004662 if (sb->s_bdev->bd_part)
4663 es->s_kbytes_written =
4664 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
Theodore Ts'oafc32f72009-02-28 19:39:58 -05004665 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4666 EXT4_SB(sb)->s_sectors_written_start) >> 1));
Theodore Ts'of613dfc2010-07-27 11:56:08 -04004667 else
4668 es->s_kbytes_written =
4669 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
Theodore Ts'od5e03cb2014-07-15 06:01:38 -04004670 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
4671 ext4_free_blocks_count_set(es,
Theodore Ts'o57042652011-09-09 18:56:51 -04004672 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4673 &EXT4_SB(sb)->s_freeclusters_counter)));
Theodore Ts'od5e03cb2014-07-15 06:01:38 -04004674 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
4675 es->s_free_inodes_count =
4676 cpu_to_le32(percpu_counter_sum_positive(
Theodore Ts'oce7e0102010-11-03 12:03:21 -04004677 &EXT4_SB(sb)->s_freeinodes_counter));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004678 BUFFER_TRACE(sbh, "marking dirty");
Theodore Ts'o06db49e2012-10-10 01:06:58 -04004679 ext4_superblock_csum_set(sb);
Theodore Ts'o24d12512016-11-13 22:02:29 -05004680 if (sync)
4681 lock_buffer(sbh);
Theodore Ts'oc173c382018-12-30 23:20:39 -05004682 if (buffer_write_io_error(sbh) || !buffer_uptodate(sbh)) {
Pranay Kr. Srivastava4743f832016-07-04 10:24:52 -04004683 /*
4684 * Oh, dear. A previous attempt to write the
4685 * superblock failed. This could happen because the
4686 * USB device was yanked out. Or it could happen to
4687 * be a transient write error and maybe the block will
4688 * be remapped. Nothing we can do but to retry the
4689 * write and hope for the best.
4690 */
4691 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4692 "superblock detected");
4693 clear_buffer_write_io_error(sbh);
4694 set_buffer_uptodate(sbh);
4695 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004696 mark_buffer_dirty(sbh);
Theodore Ts'o914258b2008-10-06 21:35:40 -04004697 if (sync) {
Theodore Ts'o24d12512016-11-13 22:02:29 -05004698 unlock_buffer(sbh);
Daeho Jeong564bc402015-07-23 09:46:11 -04004699 error = __sync_dirty_buffer(sbh,
4700 test_opt(sb, BARRIER) ? WRITE_FUA : WRITE_SYNC);
Takashi Satoc4be0c12009-01-09 16:40:58 -08004701 if (error)
4702 return error;
4703
4704 error = buffer_write_io_error(sbh);
4705 if (error) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004706 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4707 "superblock");
Theodore Ts'o914258b2008-10-06 21:35:40 -04004708 clear_buffer_write_io_error(sbh);
4709 set_buffer_uptodate(sbh);
4710 }
4711 }
Takashi Satoc4be0c12009-01-09 16:40:58 -08004712 return error;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004713}
4714
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004715/*
4716 * Have we just finished recovery? If so, and if we are mounting (or
4717 * remounting) the filesystem readonly, then we will end up with a
4718 * consistent fs on disk. Record that fact.
4719 */
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04004720static void ext4_mark_recovery_complete(struct super_block *sb,
4721 struct ext4_super_block *es)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004722{
Mingming Cao617ba132006-10-11 01:20:53 -07004723 journal_t *journal = EXT4_SB(sb)->s_journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004724
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04004725 if (!ext4_has_feature_journal(sb)) {
Frank Mayhar03901312009-01-07 00:06:22 -05004726 BUG_ON(journal != NULL);
4727 return;
4728 }
Mingming Caodab291a2006-10-11 01:21:01 -07004729 jbd2_journal_lock_updates(journal);
Hidehiro Kawai7ffe1ea2008-10-10 20:29:21 -04004730 if (jbd2_journal_flush(journal) < 0)
4731 goto out;
4732
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04004733 if (ext4_has_feature_journal_needs_recovery(sb) &&
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004734 sb->s_flags & MS_RDONLY) {
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04004735 ext4_clear_feature_journal_needs_recovery(sb);
Theodore Ts'oe2d67052009-05-01 00:33:44 -04004736 ext4_commit_super(sb, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004737 }
Hidehiro Kawai7ffe1ea2008-10-10 20:29:21 -04004738
4739out:
Mingming Caodab291a2006-10-11 01:21:01 -07004740 jbd2_journal_unlock_updates(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004741}
4742
4743/*
4744 * If we are mounting (or read-write remounting) a filesystem whose journal
4745 * has recorded an error from a previous lifetime, move that error to the
4746 * main filesystem now.
4747 */
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04004748static void ext4_clear_journal_err(struct super_block *sb,
4749 struct ext4_super_block *es)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004750{
4751 journal_t *journal;
4752 int j_errno;
4753 const char *errstr;
4754
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04004755 BUG_ON(!ext4_has_feature_journal(sb));
Frank Mayhar03901312009-01-07 00:06:22 -05004756
Mingming Cao617ba132006-10-11 01:20:53 -07004757 journal = EXT4_SB(sb)->s_journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004758
4759 /*
4760 * Now check for any error status which may have been recorded in the
Mingming Cao617ba132006-10-11 01:20:53 -07004761 * journal by a prior ext4_error() or ext4_abort()
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004762 */
4763
Mingming Caodab291a2006-10-11 01:21:01 -07004764 j_errno = jbd2_journal_errno(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004765 if (j_errno) {
4766 char nbuf[16];
4767
Mingming Cao617ba132006-10-11 01:20:53 -07004768 errstr = ext4_decode_error(sb, j_errno, nbuf);
Eric Sandeen12062dd2010-02-15 14:19:27 -05004769 ext4_warning(sb, "Filesystem error recorded "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004770 "from previous mount: %s", errstr);
Eric Sandeen12062dd2010-02-15 14:19:27 -05004771 ext4_warning(sb, "Marking fs in need of filesystem check.");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004772
Mingming Cao617ba132006-10-11 01:20:53 -07004773 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4774 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
Theodore Ts'oe2d67052009-05-01 00:33:44 -04004775 ext4_commit_super(sb, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004776
Mingming Caodab291a2006-10-11 01:21:01 -07004777 jbd2_journal_clear_err(journal);
Theodore Ts'od796c522012-08-05 19:04:57 -04004778 jbd2_journal_update_sb_errno(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004779 }
4780}
4781
4782/*
4783 * Force the running and committing transactions to commit,
4784 * and wait on the commit.
4785 */
Mingming Cao617ba132006-10-11 01:20:53 -07004786int ext4_force_commit(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004787{
4788 journal_t *journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004789
4790 if (sb->s_flags & MS_RDONLY)
4791 return 0;
4792
Mingming Cao617ba132006-10-11 01:20:53 -07004793 journal = EXT4_SB(sb)->s_journal;
Guo Chaob1deefc2013-01-28 21:41:02 -05004794 return ext4_journal_force_commit(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004795}
4796
Mingming Cao617ba132006-10-11 01:20:53 -07004797static int ext4_sync_fs(struct super_block *sb, int wait)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004798{
Theodore Ts'o14ce0cb2008-11-03 18:10:55 -05004799 int ret = 0;
Jan Kara9eddacf2009-02-10 06:46:05 -05004800 tid_t target;
Dmitry Monakhov06a407f2013-06-12 22:25:07 -04004801 bool needs_barrier = false;
Mingming Cao8d5d02e2009-09-28 15:48:29 -04004802 struct ext4_sb_info *sbi = EXT4_SB(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004803
Theodore Ts'o9bffad12009-06-17 11:48:11 -04004804 trace_ext4_sync_fs(sb, wait);
Jan Kara2e8fa542013-06-04 14:21:02 -04004805 flush_workqueue(sbi->rsv_conversion_wq);
Jan Karaa1177822012-07-03 16:45:29 +02004806 /*
4807 * Writeback quota in non-journalled quota case - journalled quota has
4808 * no dirty dquots
4809 */
4810 dquot_writeback_dquots(sb, -1);
Dmitry Monakhov06a407f2013-06-12 22:25:07 -04004811 /*
4812 * Data writeback is possible w/o journal transaction, so barrier must
4813 * being sent at the end of the function. But we can skip it if
4814 * transaction_commit will do it for us.
4815 */
Theodore Ts'obda32532014-09-18 16:12:37 -04004816 if (sbi->s_journal) {
4817 target = jbd2_get_latest_transaction(sbi->s_journal);
4818 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
4819 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
4820 needs_barrier = true;
Dmitry Monakhov06a407f2013-06-12 22:25:07 -04004821
Theodore Ts'obda32532014-09-18 16:12:37 -04004822 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4823 if (wait)
4824 ret = jbd2_log_wait_commit(sbi->s_journal,
4825 target);
4826 }
4827 } else if (wait && test_opt(sb, BARRIER))
4828 needs_barrier = true;
Dmitry Monakhov06a407f2013-06-12 22:25:07 -04004829 if (needs_barrier) {
4830 int err;
4831 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
4832 if (!ret)
4833 ret = err;
4834 }
4835
4836 return ret;
4837}
4838
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004839/*
4840 * LVM calls this function before a (read-only) snapshot is created. This
4841 * gives us a chance to flush the journal completely and mark the fs clean.
Yongqiang Yangbe4f27d2011-04-10 22:06:07 -04004842 *
4843 * Note that only this function cannot bring a filesystem to be in a clean
Jan Kara8e8ad8a2012-06-12 16:20:38 +02004844 * state independently. It relies on upper layer to stop all data & metadata
4845 * modifications.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004846 */
Takashi Satoc4be0c12009-01-09 16:40:58 -08004847static int ext4_freeze(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004848{
Takashi Satoc4be0c12009-01-09 16:40:58 -08004849 int error = 0;
4850 journal_t *journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004851
Theodore Ts'o9ca92382009-05-01 12:52:25 -04004852 if (sb->s_flags & MS_RDONLY)
4853 return 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004854
Theodore Ts'o9ca92382009-05-01 12:52:25 -04004855 journal = EXT4_SB(sb)->s_journal;
Hidehiro Kawai7ffe1ea2008-10-10 20:29:21 -04004856
Theodore Ts'obb044572014-09-18 17:12:02 -04004857 if (journal) {
4858 /* Now we set up the journal barrier. */
4859 jbd2_journal_lock_updates(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004860
Theodore Ts'obb044572014-09-18 17:12:02 -04004861 /*
4862 * Don't clear the needs_recovery flag if we failed to
4863 * flush the journal.
4864 */
4865 error = jbd2_journal_flush(journal);
4866 if (error < 0)
4867 goto out;
Eric Sandeenc642dc92015-08-15 10:45:06 -04004868
4869 /* Journal blocked and flushed, clear needs_recovery flag. */
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04004870 ext4_clear_feature_journal_needs_recovery(sb);
Theodore Ts'obb044572014-09-18 17:12:02 -04004871 }
Theodore Ts'o9ca92382009-05-01 12:52:25 -04004872
Theodore Ts'o9ca92382009-05-01 12:52:25 -04004873 error = ext4_commit_super(sb, 1);
Eric Sandeen6b0310f2010-05-16 02:00:00 -04004874out:
Theodore Ts'obb044572014-09-18 17:12:02 -04004875 if (journal)
4876 /* we rely on upper layer to stop further updates */
4877 jbd2_journal_unlock_updates(journal);
Eric Sandeen6b0310f2010-05-16 02:00:00 -04004878 return error;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004879}
4880
4881/*
4882 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4883 * flag here, even though the filesystem is not technically dirty yet.
4884 */
Takashi Satoc4be0c12009-01-09 16:40:58 -08004885static int ext4_unfreeze(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004886{
Theodore Ts'o9ca92382009-05-01 12:52:25 -04004887 if (sb->s_flags & MS_RDONLY)
4888 return 0;
4889
Eric Sandeenc642dc92015-08-15 10:45:06 -04004890 if (EXT4_SB(sb)->s_journal) {
4891 /* Reset the needs_recovery flag before the fs is unlocked. */
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04004892 ext4_set_feature_journal_needs_recovery(sb);
Eric Sandeenc642dc92015-08-15 10:45:06 -04004893 }
4894
Theodore Ts'o9ca92382009-05-01 12:52:25 -04004895 ext4_commit_super(sb, 1);
Takashi Satoc4be0c12009-01-09 16:40:58 -08004896 return 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004897}
4898
Theodore Ts'o673c6102010-12-15 20:28:48 -05004899/*
4900 * Structure to save mount options for ext4_remount's benefit
4901 */
4902struct ext4_mount_options {
4903 unsigned long s_mount_opt;
Theodore Ts'oa2595b82010-12-15 20:30:48 -05004904 unsigned long s_mount_opt2;
Eric W. Biederman08cefc72012-02-07 15:41:49 -08004905 kuid_t s_resuid;
4906 kgid_t s_resgid;
Theodore Ts'o673c6102010-12-15 20:28:48 -05004907 unsigned long s_commit_interval;
4908 u32 s_min_batch_time, s_max_batch_time;
4909#ifdef CONFIG_QUOTA
4910 int s_jquota_fmt;
Jan Karaa2d4a642014-09-11 11:15:15 -04004911 char *s_qf_names[EXT4_MAXQUOTAS];
Theodore Ts'o673c6102010-12-15 20:28:48 -05004912#endif
4913};
4914
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04004915static int ext4_remount(struct super_block *sb, int *flags, char *data)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004916{
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04004917 struct ext4_super_block *es;
Mingming Cao617ba132006-10-11 01:20:53 -07004918 struct ext4_sb_info *sbi = EXT4_SB(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004919 unsigned long old_sb_flags;
Mingming Cao617ba132006-10-11 01:20:53 -07004920 struct ext4_mount_options old_opts;
Christoph Hellwigc79d9672010-05-19 07:16:40 -04004921 int enable_quota = 0;
Theodore Ts'o8a266462008-07-26 14:34:21 -04004922 ext4_group_t g;
Theodore Ts'ob3881f72009-01-05 22:46:26 -05004923 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
Johann Lombardic5e06d12011-05-24 18:31:25 -04004924 int err = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004925#ifdef CONFIG_QUOTA
Chen Gang03dafb52013-01-24 23:24:58 -05004926 int i, j;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004927#endif
Curt Wohlgemuthd4c402d2010-05-16 12:00:00 -04004928 char *orig_data = kstrdup(data, GFP_KERNEL);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004929
4930 /* Store the original options */
4931 old_sb_flags = sb->s_flags;
4932 old_opts.s_mount_opt = sbi->s_mount_opt;
Theodore Ts'oa2595b82010-12-15 20:30:48 -05004933 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004934 old_opts.s_resuid = sbi->s_resuid;
4935 old_opts.s_resgid = sbi->s_resgid;
4936 old_opts.s_commit_interval = sbi->s_commit_interval;
Theodore Ts'o30773842009-01-03 20:27:38 -05004937 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4938 old_opts.s_max_batch_time = sbi->s_max_batch_time;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004939#ifdef CONFIG_QUOTA
4940 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
Jan Karaa2d4a642014-09-11 11:15:15 -04004941 for (i = 0; i < EXT4_MAXQUOTAS; i++)
Chen Gang03dafb52013-01-24 23:24:58 -05004942 if (sbi->s_qf_names[i]) {
4943 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
4944 GFP_KERNEL);
4945 if (!old_opts.s_qf_names[i]) {
4946 for (j = 0; j < i; j++)
4947 kfree(old_opts.s_qf_names[j]);
Wei Yongjun3e36a162013-03-02 17:13:55 -05004948 kfree(orig_data);
Chen Gang03dafb52013-01-24 23:24:58 -05004949 return -ENOMEM;
4950 }
4951 } else
4952 old_opts.s_qf_names[i] = NULL;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004953#endif
Theodore Ts'ob3881f72009-01-05 22:46:26 -05004954 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4955 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004956
Eric Sandeen661aa522012-02-20 17:53:04 -05004957 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004958 err = -EINVAL;
4959 goto restore_opts;
4960 }
4961
Darrick J. Wong6b992ff2014-10-30 10:53:16 -04004962 if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
4963 test_opt(sb, JOURNAL_CHECKSUM)) {
4964 ext4_msg(sb, KERN_ERR, "changing journal_checksum "
Eric Sandeen2d5b86e2015-02-12 23:07:37 -05004965 "during remount not supported; ignoring");
4966 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
Darrick J. Wongc6d3d562014-11-25 16:20:50 -05004967 }
4968
Piotr Sarna6ae65142013-08-08 23:02:24 -04004969 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
4970 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
4971 ext4_msg(sb, KERN_ERR, "can't mount with "
4972 "both data=journal and delalloc");
4973 err = -EINVAL;
4974 goto restore_opts;
4975 }
4976 if (test_opt(sb, DIOREAD_NOLOCK)) {
4977 ext4_msg(sb, KERN_ERR, "can't mount with "
4978 "both data=journal and dioread_nolock");
4979 err = -EINVAL;
4980 goto restore_opts;
4981 }
Ross Zwisler923ae0f2015-02-16 15:59:38 -08004982 if (test_opt(sb, DAX)) {
4983 ext4_msg(sb, KERN_ERR, "can't mount with "
4984 "both data=journal and dax");
4985 err = -EINVAL;
4986 goto restore_opts;
4987 }
4988 }
4989
4990 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX) {
4991 ext4_msg(sb, KERN_WARNING, "warning: refusing change of "
4992 "dax flag with busy inodes while remounting");
4993 sbi->s_mount_opt ^= EXT4_MOUNT_DAX;
Piotr Sarna6ae65142013-08-08 23:02:24 -04004994 }
4995
Theodore Ts'o4ab2f152009-06-13 10:09:36 -04004996 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
Theodore Ts'oc67d8592010-06-29 11:07:07 -04004997 ext4_abort(sb, "Abort forced by user");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004998
4999 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
Dmitry Monakhov482a7422010-02-24 11:35:32 -05005000 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005001
5002 es = sbi->s_es;
5003
Theodore Ts'ob3881f72009-01-05 22:46:26 -05005004 if (sbi->s_journal) {
Frank Mayhar03901312009-01-07 00:06:22 -05005005 ext4_init_journal_params(sb, sbi->s_journal);
Theodore Ts'ob3881f72009-01-05 22:46:26 -05005006 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
5007 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005008
Theodore Ts'oa2fd66d2015-06-23 11:03:54 -04005009 if (*flags & MS_LAZYTIME)
5010 sb->s_flags |= MS_LAZYTIME;
5011
Eric Sandeen661aa522012-02-20 17:53:04 -05005012 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
Theodore Ts'o4ab2f152009-06-13 10:09:36 -04005013 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005014 err = -EROFS;
5015 goto restore_opts;
5016 }
5017
5018 if (*flags & MS_RDONLY) {
Theodore Ts'o38c03b32014-03-13 22:49:42 -04005019 err = sync_filesystem(sb);
5020 if (err < 0)
5021 goto restore_opts;
Christoph Hellwig0f0dd622010-05-19 07:16:41 -04005022 err = dquot_suspend(sb, -1);
5023 if (err < 0)
Christoph Hellwigc79d9672010-05-19 07:16:40 -04005024 goto restore_opts;
Christoph Hellwigc79d9672010-05-19 07:16:40 -04005025
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005026 /*
5027 * First of all, the unconditional stuff we have to do
5028 * to disable replay of the journal when we next remount
5029 */
5030 sb->s_flags |= MS_RDONLY;
5031
5032 /*
5033 * OK, test if we are remounting a valid rw partition
5034 * readonly, and if so set the rdonly flag and then
5035 * mark the partition as valid again.
5036 */
Mingming Cao617ba132006-10-11 01:20:53 -07005037 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
5038 (sbi->s_mount_state & EXT4_VALID_FS))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005039 es->s_state = cpu_to_le16(sbi->s_mount_state);
5040
Theodore Ts'oa63c9eb2009-05-01 01:59:42 -04005041 if (sbi->s_journal)
Frank Mayhar03901312009-01-07 00:06:22 -05005042 ext4_mark_recovery_complete(sb, es);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005043 } else {
Eric Sandeena13fb1a2009-08-18 00:20:23 -04005044 /* Make sure we can mount this feature set readwrite */
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04005045 if (ext4_has_feature_readonly(sb) ||
Darrick J. Wong2cb5cc82015-02-12 22:31:21 -05005046 !ext4_feature_set_ok(sb, 0)) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005047 err = -EROFS;
5048 goto restore_opts;
5049 }
Eric Sandeenead65962007-02-10 01:46:08 -08005050 /*
Theodore Ts'o8a266462008-07-26 14:34:21 -04005051 * Make sure the group descriptor checksums
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04005052 * are sane. If they aren't, refuse to remount r/w.
Theodore Ts'o8a266462008-07-26 14:34:21 -04005053 */
5054 for (g = 0; g < sbi->s_groups_count; g++) {
5055 struct ext4_group_desc *gdp =
5056 ext4_get_group_desc(sb, g, NULL);
5057
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04005058 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04005059 ext4_msg(sb, KERN_ERR,
5060 "ext4_remount: Checksum for group %u failed (%u!=%u)",
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04005061 g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
Theodore Ts'o8a266462008-07-26 14:34:21 -04005062 le16_to_cpu(gdp->bg_checksum));
Darrick J. Wong6a797d22015-10-17 16:16:04 -04005063 err = -EFSBADCRC;
Theodore Ts'o8a266462008-07-26 14:34:21 -04005064 goto restore_opts;
5065 }
5066 }
5067
5068 /*
Eric Sandeenead65962007-02-10 01:46:08 -08005069 * If we have an unprocessed orphan list hanging
5070 * around from a previously readonly bdev mount,
5071 * require a full umount/remount for now.
5072 */
5073 if (es->s_last_orphan) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04005074 ext4_msg(sb, KERN_WARNING, "Couldn't "
Eric Sandeenead65962007-02-10 01:46:08 -08005075 "remount RDWR because of unprocessed "
5076 "orphan inode list. Please "
Eric Sandeenb31e1552009-06-04 17:36:36 -04005077 "umount/remount instead");
Eric Sandeenead65962007-02-10 01:46:08 -08005078 err = -EINVAL;
5079 goto restore_opts;
5080 }
5081
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005082 /*
5083 * Mounting a RDONLY partition read-write, so reread
5084 * and store the current valid flag. (It may have
5085 * been changed by e2fsck since we originally mounted
5086 * the partition.)
5087 */
Frank Mayhar03901312009-01-07 00:06:22 -05005088 if (sbi->s_journal)
5089 ext4_clear_journal_err(sb, es);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005090 sbi->s_mount_state = le16_to_cpu(es->s_state);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04005091 if (!ext4_setup_super(sb, es, 0))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005092 sb->s_flags &= ~MS_RDONLY;
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04005093 if (ext4_has_feature_mmp(sb))
Johann Lombardic5e06d12011-05-24 18:31:25 -04005094 if (ext4_multi_mount_protect(sb,
5095 le64_to_cpu(es->s_mmp_block))) {
5096 err = -EROFS;
5097 goto restore_opts;
5098 }
Christoph Hellwigc79d9672010-05-19 07:16:40 -04005099 enable_quota = 1;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005100 }
5101 }
Lukas Czernerbfff6872010-10-27 21:30:05 -04005102
5103 /*
5104 * Reinitialize lazy itable initialization thread based on
5105 * current settings
5106 */
5107 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
5108 ext4_unregister_li_request(sb);
5109 else {
5110 ext4_group_t first_not_zeroed;
5111 first_not_zeroed = ext4_has_uninit_itable(sb);
5112 ext4_register_li_request(sb, first_not_zeroed);
5113 }
5114
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04005115 ext4_setup_system_zone(sb);
Michael Tokarevd096ad02012-12-25 14:08:16 -05005116 if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
Theodore Ts'oe2d67052009-05-01 00:33:44 -04005117 ext4_commit_super(sb, 1);
Frank Mayhar03901312009-01-07 00:06:22 -05005118
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005119#ifdef CONFIG_QUOTA
5120 /* Release old quota file names */
Jan Karaa2d4a642014-09-11 11:15:15 -04005121 for (i = 0; i < EXT4_MAXQUOTAS; i++)
Chen Gang03dafb52013-01-24 23:24:58 -05005122 kfree(old_opts.s_qf_names[i]);
Aditya Kali7c319d32012-07-22 20:21:31 -04005123 if (enable_quota) {
5124 if (sb_any_quota_suspended(sb))
5125 dquot_resume(sb, -1);
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04005126 else if (ext4_has_feature_quota(sb)) {
Aditya Kali7c319d32012-07-22 20:21:31 -04005127 err = ext4_enable_quotas(sb);
Theodore Ts'o07724f92012-08-17 19:08:42 -04005128 if (err)
Aditya Kali7c319d32012-07-22 20:21:31 -04005129 goto restore_opts;
Aditya Kali7c319d32012-07-22 20:21:31 -04005130 }
5131 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005132#endif
Curt Wohlgemuthd4c402d2010-05-16 12:00:00 -04005133
Theodore Ts'oa26f4992015-02-02 00:37:02 -05005134 *flags = (*flags & ~MS_LAZYTIME) | (sb->s_flags & MS_LAZYTIME);
Curt Wohlgemuthd4c402d2010-05-16 12:00:00 -04005135 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
5136 kfree(orig_data);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005137 return 0;
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04005138
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005139restore_opts:
5140 sb->s_flags = old_sb_flags;
5141 sbi->s_mount_opt = old_opts.s_mount_opt;
Theodore Ts'oa2595b82010-12-15 20:30:48 -05005142 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005143 sbi->s_resuid = old_opts.s_resuid;
5144 sbi->s_resgid = old_opts.s_resgid;
5145 sbi->s_commit_interval = old_opts.s_commit_interval;
Theodore Ts'o30773842009-01-03 20:27:38 -05005146 sbi->s_min_batch_time = old_opts.s_min_batch_time;
5147 sbi->s_max_batch_time = old_opts.s_max_batch_time;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005148#ifdef CONFIG_QUOTA
5149 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
Jan Karaa2d4a642014-09-11 11:15:15 -04005150 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
Chen Gang03dafb52013-01-24 23:24:58 -05005151 kfree(sbi->s_qf_names[i]);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005152 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
5153 }
5154#endif
Curt Wohlgemuthd4c402d2010-05-16 12:00:00 -04005155 kfree(orig_data);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005156 return err;
5157}
5158
Li Xi689c9582016-01-08 16:01:22 -05005159#ifdef CONFIG_QUOTA
5160static int ext4_statfs_project(struct super_block *sb,
5161 kprojid_t projid, struct kstatfs *buf)
5162{
5163 struct kqid qid;
5164 struct dquot *dquot;
5165 u64 limit;
5166 u64 curblock;
5167
5168 qid = make_kqid_projid(projid);
5169 dquot = dqget(sb, qid);
5170 if (IS_ERR(dquot))
5171 return PTR_ERR(dquot);
5172 spin_lock(&dq_data_lock);
5173
5174 limit = (dquot->dq_dqb.dqb_bsoftlimit ?
5175 dquot->dq_dqb.dqb_bsoftlimit :
5176 dquot->dq_dqb.dqb_bhardlimit) >> sb->s_blocksize_bits;
5177 if (limit && buf->f_blocks > limit) {
5178 curblock = dquot->dq_dqb.dqb_curspace >> sb->s_blocksize_bits;
5179 buf->f_blocks = limit;
5180 buf->f_bfree = buf->f_bavail =
5181 (buf->f_blocks > curblock) ?
5182 (buf->f_blocks - curblock) : 0;
5183 }
5184
5185 limit = dquot->dq_dqb.dqb_isoftlimit ?
5186 dquot->dq_dqb.dqb_isoftlimit :
5187 dquot->dq_dqb.dqb_ihardlimit;
5188 if (limit && buf->f_files > limit) {
5189 buf->f_files = limit;
5190 buf->f_ffree =
5191 (buf->f_files > dquot->dq_dqb.dqb_curinodes) ?
5192 (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
5193 }
5194
5195 spin_unlock(&dq_data_lock);
5196 dqput(dquot);
5197 return 0;
5198}
5199#endif
5200
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04005201static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005202{
5203 struct super_block *sb = dentry->d_sb;
Mingming Cao617ba132006-10-11 01:20:53 -07005204 struct ext4_sb_info *sbi = EXT4_SB(sb);
5205 struct ext4_super_block *es = sbi->s_es;
Lukas Czerner27dd4382013-04-09 22:11:22 -04005206 ext4_fsblk_t overhead = 0, resv_blocks;
Pekka Enberg960cc392006-12-06 20:35:29 -08005207 u64 fsid;
Kazuya Miod02a9392011-05-24 18:30:07 -04005208 s64 bfree;
Lukas Czerner27dd4382013-04-09 22:11:22 -04005209 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005210
Theodore Ts'o952fc182012-07-09 16:27:05 -04005211 if (!test_opt(sb, MINIX_DF))
5212 overhead = sbi->s_overhead;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005213
Mingming Cao617ba132006-10-11 01:20:53 -07005214 buf->f_type = EXT4_SUPER_MAGIC;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005215 buf->f_bsize = sb->s_blocksize;
Eric Sandeenb72f78c2012-11-08 10:33:36 -05005216 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
Theodore Ts'o57042652011-09-09 18:56:51 -04005217 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
5218 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
Kazuya Miod02a9392011-05-24 18:30:07 -04005219 /* prevent underflow in case that few free space is available */
Theodore Ts'o57042652011-09-09 18:56:51 -04005220 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
Lukas Czerner27dd4382013-04-09 22:11:22 -04005221 buf->f_bavail = buf->f_bfree -
5222 (ext4_r_blocks_count(es) + resv_blocks);
5223 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005224 buf->f_bavail = 0;
5225 buf->f_files = le32_to_cpu(es->s_inodes_count);
Peter Zijlstra52d9f3b2007-10-16 23:25:44 -07005226 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
Mingming Cao617ba132006-10-11 01:20:53 -07005227 buf->f_namelen = EXT4_NAME_LEN;
Pekka Enberg960cc392006-12-06 20:35:29 -08005228 fsid = le64_to_cpup((void *)es->s_uuid) ^
5229 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
5230 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
5231 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04005232
Li Xi689c9582016-01-08 16:01:22 -05005233#ifdef CONFIG_QUOTA
5234 if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) &&
5235 sb_has_quota_limits_enabled(sb, PRJQUOTA))
5236 ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf);
5237#endif
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005238 return 0;
5239}
5240
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04005241/* Helper function for writing quotas on sync - we need to start transaction
5242 * before quota file is locked for write. Otherwise the are possible deadlocks:
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005243 * Process 1 Process 2
Mingming Cao617ba132006-10-11 01:20:53 -07005244 * ext4_create() quota_sync()
Jan Karaa269eb12009-01-26 17:04:39 +01005245 * jbd2_journal_start() write_dquot()
Christoph Hellwig871a2932010-03-03 09:05:07 -05005246 * dquot_initialize() down(dqio_mutex)
Mingming Caodab291a2006-10-11 01:21:01 -07005247 * down(dqio_mutex) jbd2_journal_start()
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005248 *
5249 */
5250
5251#ifdef CONFIG_QUOTA
5252
5253static inline struct inode *dquot_to_inode(struct dquot *dquot)
5254{
Eric W. Biederman4c376dc2012-09-16 03:56:19 -07005255 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005256}
5257
Mingming Cao617ba132006-10-11 01:20:53 -07005258static int ext4_write_dquot(struct dquot *dquot)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005259{
5260 int ret, err;
5261 handle_t *handle;
5262 struct inode *inode;
5263
5264 inode = dquot_to_inode(dquot);
Theodore Ts'o9924a922013-02-08 21:59:22 -05005265 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04005266 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005267 if (IS_ERR(handle))
5268 return PTR_ERR(handle);
5269 ret = dquot_commit(dquot);
Mingming Cao617ba132006-10-11 01:20:53 -07005270 err = ext4_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005271 if (!ret)
5272 ret = err;
5273 return ret;
5274}
5275
Mingming Cao617ba132006-10-11 01:20:53 -07005276static int ext4_acquire_dquot(struct dquot *dquot)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005277{
5278 int ret, err;
5279 handle_t *handle;
5280
Theodore Ts'o9924a922013-02-08 21:59:22 -05005281 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04005282 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005283 if (IS_ERR(handle))
5284 return PTR_ERR(handle);
5285 ret = dquot_acquire(dquot);
Mingming Cao617ba132006-10-11 01:20:53 -07005286 err = ext4_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005287 if (!ret)
5288 ret = err;
5289 return ret;
5290}
5291
Mingming Cao617ba132006-10-11 01:20:53 -07005292static int ext4_release_dquot(struct dquot *dquot)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005293{
5294 int ret, err;
5295 handle_t *handle;
5296
Theodore Ts'o9924a922013-02-08 21:59:22 -05005297 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04005298 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
Jan Kara9c3013e2007-09-11 15:23:29 -07005299 if (IS_ERR(handle)) {
5300 /* Release dquot anyway to avoid endless cycle in dqput() */
5301 dquot_release(dquot);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005302 return PTR_ERR(handle);
Jan Kara9c3013e2007-09-11 15:23:29 -07005303 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005304 ret = dquot_release(dquot);
Mingming Cao617ba132006-10-11 01:20:53 -07005305 err = ext4_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005306 if (!ret)
5307 ret = err;
5308 return ret;
5309}
5310
Mingming Cao617ba132006-10-11 01:20:53 -07005311static int ext4_mark_dquot_dirty(struct dquot *dquot)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005312{
Jan Kara262b4662013-03-02 17:57:08 -05005313 struct super_block *sb = dquot->dq_sb;
5314 struct ext4_sb_info *sbi = EXT4_SB(sb);
5315
Jan Kara2c8be6b2008-05-13 21:27:55 -04005316 /* Are we journaling quotas? */
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04005317 if (ext4_has_feature_quota(sb) ||
Jan Kara262b4662013-03-02 17:57:08 -05005318 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005319 dquot_mark_dquot_dirty(dquot);
Mingming Cao617ba132006-10-11 01:20:53 -07005320 return ext4_write_dquot(dquot);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005321 } else {
5322 return dquot_mark_dquot_dirty(dquot);
5323 }
5324}
5325
Mingming Cao617ba132006-10-11 01:20:53 -07005326static int ext4_write_info(struct super_block *sb, int type)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005327{
5328 int ret, err;
5329 handle_t *handle;
5330
5331 /* Data block + inode block */
David Howells2b0143b2015-03-17 22:25:59 +00005332 handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005333 if (IS_ERR(handle))
5334 return PTR_ERR(handle);
5335 ret = dquot_commit_info(sb, type);
Mingming Cao617ba132006-10-11 01:20:53 -07005336 err = ext4_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005337 if (!ret)
5338 ret = err;
5339 return ret;
5340}
5341
5342/*
5343 * Turn on quotas during mount time - we need to find
5344 * the quota file and such...
5345 */
Mingming Cao617ba132006-10-11 01:20:53 -07005346static int ext4_quota_on_mount(struct super_block *sb, int type)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005347{
Christoph Hellwig287a8092010-05-19 07:16:45 -04005348 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
5349 EXT4_SB(sb)->s_jquota_fmt, type);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005350}
5351
Theodore Ts'odaf647d2016-04-01 01:31:28 -04005352static void lockdep_set_quota_inode(struct inode *inode, int subclass)
5353{
5354 struct ext4_inode_info *ei = EXT4_I(inode);
5355
5356 /* The first argument of lockdep_set_subclass has to be
5357 * *exactly* the same as the argument to init_rwsem() --- in
5358 * this case, in init_once() --- or lockdep gets unhappy
5359 * because the name of the lock is set using the
5360 * stringification of the argument to init_rwsem().
5361 */
5362 (void) ei; /* shut up clang warning if !CONFIG_LOCKDEP */
5363 lockdep_set_subclass(&ei->i_data_sem, subclass);
5364}
5365
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005366/*
5367 * Standard function to be called on quota_on
5368 */
Mingming Cao617ba132006-10-11 01:20:53 -07005369static int ext4_quota_on(struct super_block *sb, int type, int format_id,
Jan Karaf00c9e42010-09-15 17:38:58 +02005370 struct path *path)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005371{
5372 int err;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005373
5374 if (!test_opt(sb, QUOTA))
5375 return -EINVAL;
Jan Kara06235432008-05-13 19:11:51 -04005376
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005377 /* Quotafile not on the same filesystem? */
Al Virod8c95842011-12-07 18:16:57 -05005378 if (path->dentry->d_sb != sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005379 return -EXDEV;
Jan Kara06235432008-05-13 19:11:51 -04005380 /* Journaling quota? */
5381 if (EXT4_SB(sb)->s_qf_names[type]) {
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04005382 /* Quotafile not in fs root? */
Jan Karaf00c9e42010-09-15 17:38:58 +02005383 if (path->dentry->d_parent != sb->s_root)
Eric Sandeenb31e1552009-06-04 17:36:36 -04005384 ext4_msg(sb, KERN_WARNING,
5385 "Quota file not on filesystem root. "
5386 "Journaled quota will not work");
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04005387 }
Jan Kara06235432008-05-13 19:11:51 -04005388
5389 /*
5390 * When we journal data on quota file, we have to flush journal to see
5391 * all updates to the file when we bypass pagecache...
5392 */
Frank Mayhar03901312009-01-07 00:06:22 -05005393 if (EXT4_SB(sb)->s_journal &&
David Howells2b0143b2015-03-17 22:25:59 +00005394 ext4_should_journal_data(d_inode(path->dentry))) {
Jan Kara06235432008-05-13 19:11:51 -04005395 /*
5396 * We don't need to lock updates but journal_flush() could
5397 * otherwise be livelocked...
5398 */
5399 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
Hidehiro Kawai7ffe1ea2008-10-10 20:29:21 -04005400 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
Jan Kara06235432008-05-13 19:11:51 -04005401 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
Jan Karaf00c9e42010-09-15 17:38:58 +02005402 if (err)
Hidehiro Kawai7ffe1ea2008-10-10 20:29:21 -04005403 return err;
Jan Kara06235432008-05-13 19:11:51 -04005404 }
Theodore Ts'odaf647d2016-04-01 01:31:28 -04005405 lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA);
5406 err = dquot_quota_on(sb, type, format_id, path);
5407 if (err)
5408 lockdep_set_quota_inode(path->dentry->d_inode,
5409 I_DATA_SEM_NORMAL);
5410 return err;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005411}
5412
Aditya Kali7c319d32012-07-22 20:21:31 -04005413static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
5414 unsigned int flags)
5415{
5416 int err;
5417 struct inode *qf_inode;
Jan Karaa2d4a642014-09-11 11:15:15 -04005418 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
Aditya Kali7c319d32012-07-22 20:21:31 -04005419 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
Li Xi689c9582016-01-08 16:01:22 -05005420 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5421 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
Aditya Kali7c319d32012-07-22 20:21:31 -04005422 };
5423
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04005424 BUG_ON(!ext4_has_feature_quota(sb));
Aditya Kali7c319d32012-07-22 20:21:31 -04005425
5426 if (!qf_inums[type])
5427 return -EPERM;
5428
5429 qf_inode = ext4_iget(sb, qf_inums[type]);
5430 if (IS_ERR(qf_inode)) {
5431 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
5432 return PTR_ERR(qf_inode);
5433 }
5434
Jan Karabcb13852013-04-09 09:21:41 -04005435 /* Don't account quota for quota files to avoid recursion */
5436 qf_inode->i_flags |= S_NOQUOTA;
Theodore Ts'odaf647d2016-04-01 01:31:28 -04005437 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA);
Aditya Kali7c319d32012-07-22 20:21:31 -04005438 err = dquot_enable(qf_inode, type, format_id, flags);
Theodore Ts'odaf647d2016-04-01 01:31:28 -04005439 if (err)
5440 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL);
Pan Bian836bf262018-12-03 23:28:02 -05005441 iput(qf_inode);
Aditya Kali7c319d32012-07-22 20:21:31 -04005442
5443 return err;
5444}
5445
5446/* Enable usage tracking for all quota types. */
5447static int ext4_enable_quotas(struct super_block *sb)
5448{
5449 int type, err = 0;
Jan Karaa2d4a642014-09-11 11:15:15 -04005450 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
Aditya Kali7c319d32012-07-22 20:21:31 -04005451 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
Li Xi689c9582016-01-08 16:01:22 -05005452 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5453 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
Aditya Kali7c319d32012-07-22 20:21:31 -04005454 };
Jan Kara49da9392016-09-05 23:08:16 -04005455 bool quota_mopt[EXT4_MAXQUOTAS] = {
5456 test_opt(sb, USRQUOTA),
5457 test_opt(sb, GRPQUOTA),
5458 test_opt(sb, PRJQUOTA),
5459 };
Aditya Kali7c319d32012-07-22 20:21:31 -04005460
5461 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
Jan Karaa2d4a642014-09-11 11:15:15 -04005462 for (type = 0; type < EXT4_MAXQUOTAS; type++) {
Aditya Kali7c319d32012-07-22 20:21:31 -04005463 if (qf_inums[type]) {
5464 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
Jan Kara49da9392016-09-05 23:08:16 -04005465 DQUOT_USAGE_ENABLED |
5466 (quota_mopt[type] ? DQUOT_LIMITS_ENABLED : 0));
Aditya Kali7c319d32012-07-22 20:21:31 -04005467 if (err) {
zhangyi (F)3806cea2017-08-24 15:21:50 -04005468 for (type--; type >= 0; type--)
5469 dquot_quota_off(sb, type);
5470
Aditya Kali7c319d32012-07-22 20:21:31 -04005471 ext4_warning(sb,
Theodore Ts'o72ba7452013-01-24 23:24:54 -05005472 "Failed to enable quota tracking "
5473 "(type=%d, err=%d). Please run "
5474 "e2fsck to fix.", type, err);
Aditya Kali7c319d32012-07-22 20:21:31 -04005475 return err;
5476 }
5477 }
5478 }
5479 return 0;
5480}
5481
Dmitry Monakhovca0e05e2010-08-01 17:48:36 -04005482static int ext4_quota_off(struct super_block *sb, int type)
5483{
Jan Kara21f97692011-04-04 15:33:39 -04005484 struct inode *inode = sb_dqopt(sb)->files[type];
5485 handle_t *handle;
5486
Dmitry Monakhov87009d82010-11-08 13:47:33 -05005487 /* Force all delayed allocation blocks to be allocated.
5488 * Caller already holds s_umount sem */
5489 if (test_opt(sb, DELALLOC))
Dmitry Monakhovca0e05e2010-08-01 17:48:36 -04005490 sync_filesystem(sb);
Dmitry Monakhovca0e05e2010-08-01 17:48:36 -04005491
Amir Goldstein0b268592011-05-16 09:59:13 -04005492 if (!inode)
5493 goto out;
5494
Jan Kara21f97692011-04-04 15:33:39 -04005495 /* Update modification times of quota files when userspace can
5496 * start looking at them */
Theodore Ts'o9924a922013-02-08 21:59:22 -05005497 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
Jan Kara21f97692011-04-04 15:33:39 -04005498 if (IS_ERR(handle))
5499 goto out;
5500 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
5501 ext4_mark_inode_dirty(handle, inode);
5502 ext4_journal_stop(handle);
5503
5504out:
Dmitry Monakhovca0e05e2010-08-01 17:48:36 -04005505 return dquot_quota_off(sb, type);
5506}
5507
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005508/* Read data from quotafile - avoid pagecache and such because we cannot afford
5509 * acquiring the locks... As quota files are never truncated and quota code
Lucas De Marchi25985ed2011-03-30 22:57:33 -03005510 * itself serializes the operations (and no one else should touch the files)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005511 * we don't have to be afraid of races */
Mingming Cao617ba132006-10-11 01:20:53 -07005512static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005513 size_t len, loff_t off)
5514{
5515 struct inode *inode = sb_dqopt(sb)->files[type];
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05005516 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005517 int offset = off & (sb->s_blocksize - 1);
5518 int tocopy;
5519 size_t toread;
5520 struct buffer_head *bh;
5521 loff_t i_size = i_size_read(inode);
5522
5523 if (off > i_size)
5524 return 0;
5525 if (off+len > i_size)
5526 len = i_size-off;
5527 toread = len;
5528 while (toread > 0) {
5529 tocopy = sb->s_blocksize - offset < toread ?
5530 sb->s_blocksize - offset : toread;
Theodore Ts'o1c215022014-08-29 20:52:15 -04005531 bh = ext4_bread(NULL, inode, blk, 0);
5532 if (IS_ERR(bh))
5533 return PTR_ERR(bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005534 if (!bh) /* A hole? */
5535 memset(data, 0, tocopy);
5536 else
5537 memcpy(data, bh->b_data+offset, tocopy);
5538 brelse(bh);
5539 offset = 0;
5540 toread -= tocopy;
5541 data += tocopy;
5542 blk++;
5543 }
5544 return len;
5545}
5546
5547/* Write to quotafile (we know the transaction is already started and has
5548 * enough credits) */
Mingming Cao617ba132006-10-11 01:20:53 -07005549static ssize_t ext4_quota_write(struct super_block *sb, int type,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005550 const char *data, size_t len, loff_t off)
5551{
5552 struct inode *inode = sb_dqopt(sb)->files[type];
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05005553 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
Theodore Ts'o1c215022014-08-29 20:52:15 -04005554 int err, offset = off & (sb->s_blocksize - 1);
Theodore Ts'oc5e298a2015-06-21 01:25:29 -04005555 int retries = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005556 struct buffer_head *bh;
5557 handle_t *handle = journal_current_handle();
5558
Frank Mayhar03901312009-01-07 00:06:22 -05005559 if (EXT4_SB(sb)->s_journal && !handle) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04005560 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5561 " cancelled because transaction is not started",
Jan Kara9c3013e2007-09-11 15:23:29 -07005562 (unsigned long long)off, (unsigned long long)len);
5563 return -EIO;
5564 }
Dmitry Monakhov67eeb562010-03-02 08:08:51 -05005565 /*
5566 * Since we account only one data block in transaction credits,
5567 * then it is impossible to cross a block boundary.
5568 */
5569 if (sb->s_blocksize - offset < len) {
5570 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5571 " cancelled because not block aligned",
5572 (unsigned long long)off, (unsigned long long)len);
5573 return -EIO;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005574 }
Dmitry Monakhov67eeb562010-03-02 08:08:51 -05005575
Theodore Ts'oc5e298a2015-06-21 01:25:29 -04005576 do {
5577 bh = ext4_bread(handle, inode, blk,
5578 EXT4_GET_BLOCKS_CREATE |
5579 EXT4_GET_BLOCKS_METADATA_NOFAIL);
5580 } while (IS_ERR(bh) && (PTR_ERR(bh) == -ENOSPC) &&
5581 ext4_should_retry_alloc(inode->i_sb, &retries));
Theodore Ts'o1c215022014-08-29 20:52:15 -04005582 if (IS_ERR(bh))
5583 return PTR_ERR(bh);
Dmitry Monakhov67eeb562010-03-02 08:08:51 -05005584 if (!bh)
5585 goto out;
liang xie5d601252014-05-12 22:06:43 -04005586 BUFFER_TRACE(bh, "get write access");
Jan Kara62d2b5f2010-07-27 11:56:07 -04005587 err = ext4_journal_get_write_access(handle, bh);
5588 if (err) {
5589 brelse(bh);
Theodore Ts'o1c215022014-08-29 20:52:15 -04005590 return err;
Dmitry Monakhov67eeb562010-03-02 08:08:51 -05005591 }
5592 lock_buffer(bh);
5593 memcpy(bh->b_data+offset, data, len);
5594 flush_dcache_page(bh->b_page);
5595 unlock_buffer(bh);
Jan Kara62d2b5f2010-07-27 11:56:07 -04005596 err = ext4_handle_dirty_metadata(handle, NULL, bh);
Dmitry Monakhov67eeb562010-03-02 08:08:51 -05005597 brelse(bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005598out:
Dmitry Monakhov67eeb562010-03-02 08:08:51 -05005599 if (inode->i_size < off + len) {
5600 i_size_write(inode, off + len);
Mingming Cao617ba132006-10-11 01:20:53 -07005601 EXT4_I(inode)->i_disksize = inode->i_size;
Jan Kara21f97692011-04-04 15:33:39 -04005602 ext4_mark_inode_dirty(handle, inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005603 }
Dmitry Monakhov67eeb562010-03-02 08:08:51 -05005604 return len;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005605}
5606
Theodore Ts'o8f0e8742016-04-01 12:00:03 -04005607static int ext4_get_next_id(struct super_block *sb, struct kqid *qid)
5608{
5609 const struct quota_format_ops *ops;
5610
5611 if (!sb_has_quota_loaded(sb, qid->type))
5612 return -ESRCH;
5613 ops = sb_dqopt(sb)->ops[qid->type];
5614 if (!ops || !ops->get_next_id)
5615 return -ENOSYS;
5616 return dquot_get_next_id(sb, qid);
5617}
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005618#endif
5619
Al Viro152a0832010-07-25 00:46:55 +04005620static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5621 const char *dev_name, void *data)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005622{
Al Viro152a0832010-07-25 00:46:55 +04005623 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005624}
5625
Jan Karac290ea02015-06-18 16:52:29 +02005626#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
Theodore Ts'o24b58422009-12-07 14:08:51 -05005627static inline void register_as_ext2(void)
5628{
5629 int err = register_filesystem(&ext2_fs_type);
5630 if (err)
5631 printk(KERN_WARNING
5632 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5633}
5634
5635static inline void unregister_as_ext2(void)
5636{
5637 unregister_filesystem(&ext2_fs_type);
5638}
Theodore Ts'o2035e772011-04-18 17:29:14 -04005639
5640static inline int ext2_feature_set_ok(struct super_block *sb)
5641{
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04005642 if (ext4_has_unknown_ext2_incompat_features(sb))
Theodore Ts'o2035e772011-04-18 17:29:14 -04005643 return 0;
5644 if (sb->s_flags & MS_RDONLY)
5645 return 1;
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04005646 if (ext4_has_unknown_ext2_ro_compat_features(sb))
Theodore Ts'o2035e772011-04-18 17:29:14 -04005647 return 0;
5648 return 1;
5649}
Theodore Ts'o24b58422009-12-07 14:08:51 -05005650#else
5651static inline void register_as_ext2(void) { }
5652static inline void unregister_as_ext2(void) { }
Theodore Ts'o2035e772011-04-18 17:29:14 -04005653static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
Theodore Ts'o24b58422009-12-07 14:08:51 -05005654#endif
5655
Theodore Ts'o24b58422009-12-07 14:08:51 -05005656static inline void register_as_ext3(void)
5657{
5658 int err = register_filesystem(&ext3_fs_type);
5659 if (err)
5660 printk(KERN_WARNING
5661 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5662}
5663
5664static inline void unregister_as_ext3(void)
5665{
5666 unregister_filesystem(&ext3_fs_type);
5667}
Theodore Ts'o2035e772011-04-18 17:29:14 -04005668
5669static inline int ext3_feature_set_ok(struct super_block *sb)
5670{
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04005671 if (ext4_has_unknown_ext3_incompat_features(sb))
Theodore Ts'o2035e772011-04-18 17:29:14 -04005672 return 0;
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04005673 if (!ext4_has_feature_journal(sb))
Theodore Ts'o2035e772011-04-18 17:29:14 -04005674 return 0;
5675 if (sb->s_flags & MS_RDONLY)
5676 return 1;
Darrick J. Wonge2b911c2015-10-17 16:18:43 -04005677 if (ext4_has_unknown_ext3_ro_compat_features(sb))
Theodore Ts'o2035e772011-04-18 17:29:14 -04005678 return 0;
5679 return 1;
5680}
Theodore Ts'o24b58422009-12-07 14:08:51 -05005681
Theodore Ts'o03010a32008-10-10 20:02:48 -04005682static struct file_system_type ext4_fs_type = {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005683 .owner = THIS_MODULE,
Theodore Ts'o03010a32008-10-10 20:02:48 -04005684 .name = "ext4",
Al Viro152a0832010-07-25 00:46:55 +04005685 .mount = ext4_mount,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005686 .kill_sb = kill_block_super,
5687 .fs_flags = FS_REQUIRES_DEV,
5688};
Eric W. Biederman7f78e032013-03-02 19:39:14 -08005689MODULE_ALIAS_FS("ext4");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005690
Eric Sandeene9e3bce2011-02-12 08:17:34 -05005691/* Shared across all ext4 file systems */
5692wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
Eric Sandeene9e3bce2011-02-12 08:17:34 -05005693
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04005694static int __init ext4_init_fs(void)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005695{
Eric Sandeene9e3bce2011-02-12 08:17:34 -05005696 int i, err;
Alex Tomasc9de5602008-01-29 00:19:52 -05005697
Theodore Ts'oe294a532015-08-15 14:59:44 -04005698 ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
Al Viro07c0c5d82012-03-20 22:05:02 -04005699 ext4_li_info = NULL;
5700 mutex_init(&ext4_li_mtx);
5701
Carlos Maiolino9a4c8012012-12-10 16:30:45 -05005702 /* Build-time check for flags consistency */
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04005703 ext4_check_flag_values();
Eric Sandeene9e3bce2011-02-12 08:17:34 -05005704
Jan Karae142d052016-03-08 22:44:50 -05005705 for (i = 0; i < EXT4_WQ_HASH_SZ; i++)
Eric Sandeene9e3bce2011-02-12 08:17:34 -05005706 init_waitqueue_head(&ext4__ioend_wq[i]);
Eric Sandeene9e3bce2011-02-12 08:17:34 -05005707
Zheng Liu51865fd2012-11-08 21:57:32 -05005708 err = ext4_init_es();
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04005709 if (err)
5710 return err;
Zheng Liu51865fd2012-11-08 21:57:32 -05005711
5712 err = ext4_init_pageio();
5713 if (err)
Theodore Ts'ob5799012015-09-23 12:44:17 -04005714 goto out5;
Zheng Liu51865fd2012-11-08 21:57:32 -05005715
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04005716 err = ext4_init_system_zone();
Theodore Ts'obd2d0212010-10-27 21:30:10 -04005717 if (err)
Theodore Ts'ob5799012015-09-23 12:44:17 -04005718 goto out4;
Lukas Czerner857ac882010-10-27 21:30:05 -04005719
Theodore Ts'ob5799012015-09-23 12:44:17 -04005720 err = ext4_init_sysfs();
Theodore Ts'odd683142011-02-03 14:33:49 -05005721 if (err)
Theodore Ts'ob5799012015-09-23 12:44:17 -04005722 goto out3;
Lukas Czerner857ac882010-10-27 21:30:05 -04005723
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04005724 err = ext4_init_mballoc();
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005725 if (err)
Alex Tomasc9de5602008-01-29 00:19:52 -05005726 goto out2;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005727 err = init_inodecache();
5728 if (err)
5729 goto out1;
Theodore Ts'o24b58422009-12-07 14:08:51 -05005730 register_as_ext3();
Theodore Ts'o2035e772011-04-18 17:29:14 -04005731 register_as_ext2();
Theodore Ts'o03010a32008-10-10 20:02:48 -04005732 err = register_filesystem(&ext4_fs_type);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005733 if (err)
5734 goto out;
Lukas Czernerbfff6872010-10-27 21:30:05 -04005735
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005736 return 0;
5737out:
Theodore Ts'o24b58422009-12-07 14:08:51 -05005738 unregister_as_ext2();
5739 unregister_as_ext3();
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005740 destroy_inodecache();
5741out1:
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04005742 ext4_exit_mballoc();
T Makphaibulchoke9c191f72014-03-18 19:24:49 -04005743out2:
Theodore Ts'ob5799012015-09-23 12:44:17 -04005744 ext4_exit_sysfs();
5745out3:
Theodore Ts'odd683142011-02-03 14:33:49 -05005746 ext4_exit_system_zone();
Theodore Ts'ob5799012015-09-23 12:44:17 -04005747out4:
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04005748 ext4_exit_pageio();
Theodore Ts'ob5799012015-09-23 12:44:17 -04005749out5:
Zheng Liu51865fd2012-11-08 21:57:32 -05005750 ext4_exit_es();
5751
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005752 return err;
5753}
5754
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04005755static void __exit ext4_exit_fs(void)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005756{
Lukas Czernerbfff6872010-10-27 21:30:05 -04005757 ext4_destroy_lazyinit_thread();
Theodore Ts'o24b58422009-12-07 14:08:51 -05005758 unregister_as_ext2();
5759 unregister_as_ext3();
Theodore Ts'o03010a32008-10-10 20:02:48 -04005760 unregister_filesystem(&ext4_fs_type);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005761 destroy_inodecache();
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04005762 ext4_exit_mballoc();
Theodore Ts'ob5799012015-09-23 12:44:17 -04005763 ext4_exit_sysfs();
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04005764 ext4_exit_system_zone();
5765 ext4_exit_pageio();
Eric Sandeendd12ed12013-07-26 15:21:11 -04005766 ext4_exit_es();
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005767}
5768
5769MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
Theodore Ts'o83982b62009-01-06 14:53:16 -05005770MODULE_DESCRIPTION("Fourth Extended Filesystem");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005771MODULE_LICENSE("GPL");
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04005772module_init(ext4_init_fs)
5773module_exit(ext4_exit_fs)