blob: 1f7784de05b6c6afad4d7437202ceb6efeec3399 [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>
Mingming Caodab291a2006-10-11 01:21:01 -070024#include <linux/jbd2.h>
Dave Kleikampac27a0e2006-10-11 01:20:50 -070025#include <linux/slab.h>
26#include <linux/init.h>
27#include <linux/blkdev.h>
28#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'o9f6200b2008-09-23 09:18:24 -040037#include <linux/proc_fs.h>
Theodore Ts'o3197ebd2009-03-31 09:10:09 -040038#include <linux/ctype.h>
Vignesh Babu13305932007-07-18 09:11:02 -040039#include <linux/log2.h>
Andreas Dilger717d50e2007-10-16 18:38:25 -040040#include <linux/crc16.h>
Dan Magenheimer7abc52c2011-05-26 10:02:03 -060041#include <linux/cleancache.h>
Dave Kleikampac27a0e2006-10-11 01:20:50 -070042#include <asm/uaccess.h>
43
Lukas Czernerbfff6872010-10-27 21:30:05 -040044#include <linux/kthread.h>
45#include <linux/freezer.h>
46
Christoph Hellwig3dcf5452008-04-29 18:13:32 -040047#include "ext4.h"
Theodore Ts'o4a092d72012-11-28 13:03:30 -050048#include "ext4_extents.h" /* Needed for trace points definition */
Christoph Hellwig3dcf5452008-04-29 18:13:32 -040049#include "ext4_jbd2.h"
Dave Kleikampac27a0e2006-10-11 01:20:50 -070050#include "xattr.h"
51#include "acl.h"
Theodore Ts'o3661d282009-09-14 22:59:50 -040052#include "mballoc.h"
Dave Kleikampac27a0e2006-10-11 01:20:50 -070053
Theodore Ts'o9bffad12009-06-17 11:48:11 -040054#define CREATE_TRACE_POINTS
55#include <trace/events/ext4.h>
56
Theodore Ts'o1f109d52010-10-27 21:30:14 -040057static struct proc_dir_entry *ext4_proc_root;
Theodore Ts'o3197ebd2009-03-31 09:10:09 -040058static struct kset *ext4_kset;
Lukas Czerner0b75a842011-02-23 12:22:49 -050059static struct ext4_lazy_init *ext4_li_info;
60static struct mutex ext4_li_mtx;
61static struct ext4_features *ext4_feat;
Theodore Ts'o9f6200b2008-09-23 09:18:24 -040062
Mingming Cao617ba132006-10-11 01:20:53 -070063static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
Dave Kleikampac27a0e2006-10-11 01:20:50 -070064 unsigned long journal_devnum);
Theodore Ts'o2adf6da2012-03-03 23:20:50 -050065static int ext4_show_options(struct seq_file *seq, struct dentry *root);
Theodore Ts'oe2d67052009-05-01 00:33:44 -040066static int ext4_commit_super(struct super_block *sb, int sync);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -040067static void ext4_mark_recovery_complete(struct super_block *sb,
68 struct ext4_super_block *es);
69static void ext4_clear_journal_err(struct super_block *sb,
70 struct ext4_super_block *es);
Mingming Cao617ba132006-10-11 01:20:53 -070071static int ext4_sync_fs(struct super_block *sb, int wait);
Dmitry Monakhov06a407f2013-06-12 22:25:07 -040072static int ext4_sync_fs_nojournal(struct super_block *sb, int wait);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -040073static int ext4_remount(struct super_block *sb, int *flags, char *data);
74static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
Takashi Satoc4be0c12009-01-09 16:40:58 -080075static int ext4_unfreeze(struct super_block *sb);
Takashi Satoc4be0c12009-01-09 16:40:58 -080076static int ext4_freeze(struct super_block *sb);
Al Viro152a0832010-07-25 00:46:55 +040077static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
78 const char *dev_name, void *data);
Theodore Ts'o2035e772011-04-18 17:29:14 -040079static inline int ext2_feature_set_ok(struct super_block *sb);
80static inline int ext3_feature_set_ok(struct super_block *sb);
Amir Goldsteind39195c2011-02-28 00:53:45 -050081static int ext4_feature_set_ok(struct super_block *sb, int readonly);
Lukas Czernerbfff6872010-10-27 21:30:05 -040082static void ext4_destroy_lazyinit_thread(void);
83static void ext4_unregister_li_request(struct super_block *sb);
Eric Sandeen8f1f7452011-02-03 14:33:15 -050084static void ext4_clear_request_list(void);
Lukas Czerner27dd4382013-04-09 22:11:22 -040085static int ext4_reserve_clusters(struct ext4_sb_info *, ext4_fsblk_t);
Dave Kleikampac27a0e2006-10-11 01:20:50 -070086
Theodore Ts'o2035e772011-04-18 17:29:14 -040087#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
88static struct file_system_type ext2_fs_type = {
89 .owner = THIS_MODULE,
90 .name = "ext2",
91 .mount = ext4_mount,
92 .kill_sb = kill_block_super,
93 .fs_flags = FS_REQUIRES_DEV,
94};
Eric W. Biederman7f78e032013-03-02 19:39:14 -080095MODULE_ALIAS_FS("ext2");
Eric W. Biedermanfa7614dd2013-03-12 18:27:41 -070096MODULE_ALIAS("ext2");
Theodore Ts'o2035e772011-04-18 17:29:14 -040097#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
98#else
99#define IS_EXT2_SB(sb) (0)
100#endif
101
102
Jan Karaba69f9a2010-03-24 20:18:37 -0400103#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
104static struct file_system_type ext3_fs_type = {
105 .owner = THIS_MODULE,
106 .name = "ext3",
Al Viro152a0832010-07-25 00:46:55 +0400107 .mount = ext4_mount,
Jan Karaba69f9a2010-03-24 20:18:37 -0400108 .kill_sb = kill_block_super,
109 .fs_flags = FS_REQUIRES_DEV,
110};
Eric W. Biederman7f78e032013-03-02 19:39:14 -0800111MODULE_ALIAS_FS("ext3");
Eric W. Biedermanfa7614dd2013-03-12 18:27:41 -0700112MODULE_ALIAS("ext3");
Jan Karaba69f9a2010-03-24 20:18:37 -0400113#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
114#else
115#define IS_EXT3_SB(sb) (0)
116#endif
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700117
Darrick J. Wongd25425f2012-04-29 18:25:10 -0400118static int ext4_verify_csum_type(struct super_block *sb,
119 struct ext4_super_block *es)
120{
121 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
122 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
123 return 1;
124
125 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
126}
127
Darrick J. Wonga9c473172012-04-29 18:29:10 -0400128static __le32 ext4_superblock_csum(struct super_block *sb,
129 struct ext4_super_block *es)
130{
131 struct ext4_sb_info *sbi = EXT4_SB(sb);
132 int offset = offsetof(struct ext4_super_block, s_checksum);
133 __u32 csum;
134
135 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
136
137 return cpu_to_le32(csum);
138}
139
140int ext4_superblock_csum_verify(struct super_block *sb,
141 struct ext4_super_block *es)
142{
143 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
144 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
145 return 1;
146
147 return es->s_checksum == ext4_superblock_csum(sb, es);
148}
149
Theodore Ts'o06db49e2012-10-10 01:06:58 -0400150void ext4_superblock_csum_set(struct super_block *sb)
Darrick J. Wonga9c473172012-04-29 18:29:10 -0400151{
Theodore Ts'o06db49e2012-10-10 01:06:58 -0400152 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
153
Darrick J. Wonga9c473172012-04-29 18:29:10 -0400154 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
155 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
156 return;
157
158 es->s_checksum = ext4_superblock_csum(sb, es);
159}
160
Theodore Ts'o9933fc02011-08-01 08:45:02 -0400161void *ext4_kvmalloc(size_t size, gfp_t flags)
162{
163 void *ret;
164
Joe Perches8be04b92013-06-19 12:15:53 -0700165 ret = kmalloc(size, flags | __GFP_NOWARN);
Theodore Ts'o9933fc02011-08-01 08:45:02 -0400166 if (!ret)
167 ret = __vmalloc(size, flags, PAGE_KERNEL);
168 return ret;
169}
170
171void *ext4_kvzalloc(size_t size, gfp_t flags)
172{
173 void *ret;
174
Joe Perches8be04b92013-06-19 12:15:53 -0700175 ret = kzalloc(size, flags | __GFP_NOWARN);
Theodore Ts'o9933fc02011-08-01 08:45:02 -0400176 if (!ret)
177 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
178 return ret;
179}
180
181void ext4_kvfree(void *ptr)
182{
183 if (is_vmalloc_addr(ptr))
184 vfree(ptr);
185 else
186 kfree(ptr);
187
188}
189
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700190ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
191 struct ext4_group_desc *bg)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700192{
Aneesh Kumar K.V3a145892007-10-16 18:38:25 -0400193 return le32_to_cpu(bg->bg_block_bitmap_lo) |
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700194 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
Andreas Dilger0b8e58a2009-06-03 17:59:28 -0400195 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700196}
197
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700198ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
199 struct ext4_group_desc *bg)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700200{
Aneesh Kumar K.V5272f832007-10-16 18:38:25 -0400201 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700202 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
Andreas Dilger0b8e58a2009-06-03 17:59:28 -0400203 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700204}
205
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700206ext4_fsblk_t ext4_inode_table(struct super_block *sb,
207 struct ext4_group_desc *bg)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700208{
Aneesh Kumar K.V5272f832007-10-16 18:38:25 -0400209 return le32_to_cpu(bg->bg_inode_table_lo) |
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700210 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
Andreas Dilger0b8e58a2009-06-03 17:59:28 -0400211 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700212}
213
Theodore Ts'o021b65b2011-09-09 19:08:51 -0400214__u32 ext4_free_group_clusters(struct super_block *sb,
215 struct ext4_group_desc *bg)
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500216{
217 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
218 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
Andreas Dilger0b8e58a2009-06-03 17:59:28 -0400219 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500220}
221
222__u32 ext4_free_inodes_count(struct super_block *sb,
223 struct ext4_group_desc *bg)
224{
225 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
226 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
Andreas Dilger0b8e58a2009-06-03 17:59:28 -0400227 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500228}
229
230__u32 ext4_used_dirs_count(struct super_block *sb,
231 struct ext4_group_desc *bg)
232{
233 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
234 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
Andreas Dilger0b8e58a2009-06-03 17:59:28 -0400235 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500236}
237
238__u32 ext4_itable_unused_count(struct super_block *sb,
239 struct ext4_group_desc *bg)
240{
241 return le16_to_cpu(bg->bg_itable_unused_lo) |
242 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
Andreas Dilger0b8e58a2009-06-03 17:59:28 -0400243 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500244}
245
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700246void ext4_block_bitmap_set(struct super_block *sb,
247 struct ext4_group_desc *bg, ext4_fsblk_t blk)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700248{
Aneesh Kumar K.V3a145892007-10-16 18:38:25 -0400249 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700250 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
251 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700252}
253
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700254void ext4_inode_bitmap_set(struct super_block *sb,
255 struct ext4_group_desc *bg, ext4_fsblk_t blk)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700256{
Aneesh Kumar K.V5272f832007-10-16 18:38:25 -0400257 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700258 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
259 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700260}
261
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700262void ext4_inode_table_set(struct super_block *sb,
263 struct ext4_group_desc *bg, ext4_fsblk_t blk)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700264{
Aneesh Kumar K.V5272f832007-10-16 18:38:25 -0400265 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700266 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
267 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700268}
269
Theodore Ts'o021b65b2011-09-09 19:08:51 -0400270void ext4_free_group_clusters_set(struct super_block *sb,
271 struct ext4_group_desc *bg, __u32 count)
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500272{
273 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
274 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
275 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
276}
277
278void ext4_free_inodes_set(struct super_block *sb,
279 struct ext4_group_desc *bg, __u32 count)
280{
281 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
282 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
283 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
284}
285
286void ext4_used_dirs_set(struct super_block *sb,
287 struct ext4_group_desc *bg, __u32 count)
288{
289 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
290 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
291 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
292}
293
294void ext4_itable_unused_set(struct super_block *sb,
295 struct ext4_group_desc *bg, __u32 count)
296{
297 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
298 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
299 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
300}
301
Curt Wohlgemuthd3d1faf2009-09-29 11:01:03 -0400302
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400303static void __save_error_info(struct super_block *sb, const char *func,
304 unsigned int line)
305{
306 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
307
308 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
309 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
310 es->s_last_error_time = cpu_to_le32(get_seconds());
311 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
312 es->s_last_error_line = cpu_to_le32(line);
313 if (!es->s_first_error_time) {
314 es->s_first_error_time = es->s_last_error_time;
315 strncpy(es->s_first_error_func, func,
316 sizeof(es->s_first_error_func));
317 es->s_first_error_line = cpu_to_le32(line);
318 es->s_first_error_ino = es->s_last_error_ino;
319 es->s_first_error_block = es->s_last_error_block;
320 }
Theodore Ts'o66e61a92010-07-27 11:56:04 -0400321 /*
322 * Start the daily error reporting function if it hasn't been
323 * started already
324 */
325 if (!es->s_error_count)
326 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
Wei Yongjunba39ebb2012-09-27 09:37:53 -0400327 le32_add_cpu(&es->s_error_count, 1);
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400328}
329
330static void save_error_info(struct super_block *sb, const char *func,
331 unsigned int line)
332{
333 __save_error_info(sb, func, line);
334 ext4_commit_super(sb, 1);
335}
336
Theodore Ts'o7c2e7082011-09-09 18:28:51 -0400337/*
338 * The del_gendisk() function uninitializes the disk-specific data
339 * structures, including the bdi structure, without telling anyone
340 * else. Once this happens, any attempt to call mark_buffer_dirty()
341 * (for example, by ext4_commit_super), will cause a kernel OOPS.
342 * This is a kludge to prevent these oops until we can put in a proper
343 * hook in del_gendisk() to inform the VFS and file system layers.
344 */
345static int block_device_ejected(struct super_block *sb)
346{
347 struct inode *bd_inode = sb->s_bdev->bd_inode;
348 struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info;
349
350 return bdi->dev == NULL;
351}
352
Bobi Jam18aadd42012-02-20 17:53:02 -0500353static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
354{
355 struct super_block *sb = journal->j_private;
356 struct ext4_sb_info *sbi = EXT4_SB(sb);
357 int error = is_journal_aborted(journal);
Dmitry Monakhov5d3ee202013-04-03 22:08:52 -0400358 struct ext4_journal_cb_entry *jce;
Bobi Jam18aadd42012-02-20 17:53:02 -0500359
Dmitry Monakhov5d3ee202013-04-03 22:08:52 -0400360 BUG_ON(txn->t_state == T_FINISHED);
Bobi Jam18aadd42012-02-20 17:53:02 -0500361 spin_lock(&sbi->s_md_lock);
Dmitry Monakhov5d3ee202013-04-03 22:08:52 -0400362 while (!list_empty(&txn->t_private_list)) {
363 jce = list_entry(txn->t_private_list.next,
364 struct ext4_journal_cb_entry, jce_list);
Bobi Jam18aadd42012-02-20 17:53:02 -0500365 list_del_init(&jce->jce_list);
366 spin_unlock(&sbi->s_md_lock);
367 jce->jce_func(sb, jce, error);
368 spin_lock(&sbi->s_md_lock);
369 }
370 spin_unlock(&sbi->s_md_lock);
371}
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400372
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700373/* Deal with the reporting of failure conditions on a filesystem such as
374 * inconsistencies detected or read IO failures.
375 *
376 * On ext2, we can store the error state of the filesystem in the
Mingming Cao617ba132006-10-11 01:20:53 -0700377 * superblock. That is not possible on ext4, because we may have other
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700378 * write ordering constraints on the superblock which prevent us from
379 * writing it out straight away; and given that the journal is about to
380 * be aborted, we can't rely on the current, or future, transactions to
381 * write out the superblock safely.
382 *
Mingming Caodab291a2006-10-11 01:21:01 -0700383 * 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 -0200384 * the journal instead. On recovery, the journal will complain about
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700385 * that error until we've noted it down and cleared it.
386 */
387
Mingming Cao617ba132006-10-11 01:20:53 -0700388static void ext4_handle_error(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700389{
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700390 if (sb->s_flags & MS_RDONLY)
391 return;
392
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400393 if (!test_opt(sb, ERRORS_CONT)) {
Mingming Cao617ba132006-10-11 01:20:53 -0700394 journal_t *journal = EXT4_SB(sb)->s_journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700395
Theodore Ts'o4ab2f152009-06-13 10:09:36 -0400396 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700397 if (journal)
Mingming Caodab291a2006-10-11 01:21:01 -0700398 jbd2_journal_abort(journal, -EIO);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700399 }
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400400 if (test_opt(sb, ERRORS_RO)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -0400401 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
Dmitry Monakhov4418e1412013-06-12 22:38:04 -0400402 /*
403 * Make sure updated value of ->s_mount_flags will be visible
404 * before ->s_flags update
405 */
406 smp_wmb();
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700407 sb->s_flags |= MS_RDONLY;
408 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700409 if (test_opt(sb, ERRORS_PANIC))
Mingming Cao617ba132006-10-11 01:20:53 -0700410 panic("EXT4-fs (device %s): panic forced after error\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700411 sb->s_id);
412}
413
Theodore Ts'oefbed4d2013-10-17 21:11:01 -0400414#define ext4_error_ratelimit(sb) \
415 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
416 "EXT4-fs error")
417
Eric Sandeen12062dd2010-02-15 14:19:27 -0500418void __ext4_error(struct super_block *sb, const char *function,
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400419 unsigned int line, const char *fmt, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700420{
Joe Perches0ff2ea72010-12-19 22:43:19 -0500421 struct va_format vaf;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700422 va_list args;
423
Theodore Ts'oefbed4d2013-10-17 21:11:01 -0400424 if (ext4_error_ratelimit(sb)) {
425 va_start(args, fmt);
426 vaf.fmt = fmt;
427 vaf.va = &args;
428 printk(KERN_CRIT
429 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
430 sb->s_id, function, line, current->comm, &vaf);
431 va_end(args);
432 }
Theodore Ts'of3fc02102012-05-30 23:00:16 -0400433 save_error_info(sb, function, line);
Mingming Cao617ba132006-10-11 01:20:53 -0700434 ext4_handle_error(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700435}
436
Joe Perchese7c96e82013-07-01 08:12:37 -0400437void __ext4_error_inode(struct inode *inode, const char *function,
438 unsigned int line, ext4_fsblk_t block,
439 const char *fmt, ...)
Frank Mayhar273df552010-03-02 11:46:09 -0500440{
441 va_list args;
Theodore Ts'of7c21172011-01-10 12:10:55 -0500442 struct va_format vaf;
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400443 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
Frank Mayhar273df552010-03-02 11:46:09 -0500444
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400445 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
446 es->s_last_error_block = cpu_to_le64(block);
Theodore Ts'oefbed4d2013-10-17 21:11:01 -0400447 if (ext4_error_ratelimit(inode->i_sb)) {
448 va_start(args, fmt);
449 vaf.fmt = fmt;
450 vaf.va = &args;
451 if (block)
452 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
453 "inode #%lu: block %llu: comm %s: %pV\n",
454 inode->i_sb->s_id, function, line, inode->i_ino,
455 block, current->comm, &vaf);
456 else
457 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
458 "inode #%lu: comm %s: %pV\n",
459 inode->i_sb->s_id, function, line, inode->i_ino,
460 current->comm, &vaf);
461 va_end(args);
462 }
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400463 save_error_info(inode->i_sb, function, line);
Frank Mayhar273df552010-03-02 11:46:09 -0500464 ext4_handle_error(inode->i_sb);
465}
466
Joe Perchese7c96e82013-07-01 08:12:37 -0400467void __ext4_error_file(struct file *file, const char *function,
468 unsigned int line, ext4_fsblk_t block,
469 const char *fmt, ...)
Frank Mayhar273df552010-03-02 11:46:09 -0500470{
471 va_list args;
Theodore Ts'of7c21172011-01-10 12:10:55 -0500472 struct va_format vaf;
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400473 struct ext4_super_block *es;
Al Viro496ad9a2013-01-23 17:07:38 -0500474 struct inode *inode = file_inode(file);
Frank Mayhar273df552010-03-02 11:46:09 -0500475 char pathname[80], *path;
476
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400477 es = EXT4_SB(inode->i_sb)->s_es;
478 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
Theodore Ts'oefbed4d2013-10-17 21:11:01 -0400479 if (ext4_error_ratelimit(inode->i_sb)) {
480 path = d_path(&(file->f_path), pathname, sizeof(pathname));
481 if (IS_ERR(path))
482 path = "(unknown)";
483 va_start(args, fmt);
484 vaf.fmt = fmt;
485 vaf.va = &args;
486 if (block)
487 printk(KERN_CRIT
488 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
489 "block %llu: comm %s: path %s: %pV\n",
490 inode->i_sb->s_id, function, line, inode->i_ino,
491 block, current->comm, path, &vaf);
492 else
493 printk(KERN_CRIT
494 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
495 "comm %s: path %s: %pV\n",
496 inode->i_sb->s_id, function, line, inode->i_ino,
497 current->comm, path, &vaf);
498 va_end(args);
499 }
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400500 save_error_info(inode->i_sb, function, line);
Frank Mayhar273df552010-03-02 11:46:09 -0500501 ext4_handle_error(inode->i_sb);
502}
503
Theodore Ts'o722887d2013-02-08 13:00:31 -0500504const char *ext4_decode_error(struct super_block *sb, int errno,
505 char nbuf[16])
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700506{
507 char *errstr = NULL;
508
509 switch (errno) {
510 case -EIO:
511 errstr = "IO failure";
512 break;
513 case -ENOMEM:
514 errstr = "Out of memory";
515 break;
516 case -EROFS:
Theodore Ts'o78f1ddb2009-07-27 23:09:47 -0400517 if (!sb || (EXT4_SB(sb)->s_journal &&
518 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700519 errstr = "Journal has aborted";
520 else
521 errstr = "Readonly filesystem";
522 break;
523 default:
524 /* If the caller passed in an extra buffer for unknown
525 * errors, textualise them now. Else we just return
526 * NULL. */
527 if (nbuf) {
528 /* Check for truncated error codes... */
529 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
530 errstr = nbuf;
531 }
532 break;
533 }
534
535 return errstr;
536}
537
Mingming Cao617ba132006-10-11 01:20:53 -0700538/* __ext4_std_error decodes expected errors from journaling functions
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700539 * automatically and invokes the appropriate error response. */
540
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400541void __ext4_std_error(struct super_block *sb, const char *function,
542 unsigned int line, int errno)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700543{
544 char nbuf[16];
545 const char *errstr;
546
547 /* Special case: if the error is EROFS, and we're not already
548 * inside a transaction, then there's really no point in logging
549 * an error. */
550 if (errno == -EROFS && journal_current_handle() == NULL &&
551 (sb->s_flags & MS_RDONLY))
552 return;
553
Theodore Ts'oefbed4d2013-10-17 21:11:01 -0400554 if (ext4_error_ratelimit(sb)) {
555 errstr = ext4_decode_error(sb, errno, nbuf);
556 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
557 sb->s_id, function, line, errstr);
558 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700559
Theodore Ts'oefbed4d2013-10-17 21:11:01 -0400560 save_error_info(sb, function, line);
Mingming Cao617ba132006-10-11 01:20:53 -0700561 ext4_handle_error(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700562}
563
564/*
Mingming Cao617ba132006-10-11 01:20:53 -0700565 * ext4_abort is a much stronger failure handler than ext4_error. The
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700566 * abort function may be used to deal with unrecoverable failures such
567 * as journal IO errors or ENOMEM at a critical moment in log management.
568 *
569 * We unconditionally force the filesystem into an ABORT|READONLY state,
570 * unless the error response on the fs has been set to panic in which
571 * case we take the easy way out and panic immediately.
572 */
573
Theodore Ts'oc67d8592010-06-29 11:07:07 -0400574void __ext4_abort(struct super_block *sb, const char *function,
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400575 unsigned int line, const char *fmt, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700576{
577 va_list args;
578
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400579 save_error_info(sb, function, line);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700580 va_start(args, fmt);
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400581 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
582 function, line);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700583 vprintk(fmt, args);
584 printk("\n");
585 va_end(args);
586
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400587 if ((sb->s_flags & MS_RDONLY) == 0) {
588 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400589 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
Dmitry Monakhov4418e1412013-06-12 22:38:04 -0400590 /*
591 * Make sure updated value of ->s_mount_flags will be visible
592 * before ->s_flags update
593 */
594 smp_wmb();
595 sb->s_flags |= MS_RDONLY;
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400596 if (EXT4_SB(sb)->s_journal)
597 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
598 save_error_info(sb, function, line);
599 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700600 if (test_opt(sb, ERRORS_PANIC))
Mingming Cao617ba132006-10-11 01:20:53 -0700601 panic("EXT4-fs panic from previous error\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700602}
603
Joe Perchese7c96e82013-07-01 08:12:37 -0400604void __ext4_msg(struct super_block *sb,
605 const char *prefix, const char *fmt, ...)
Eric Sandeenb31e1552009-06-04 17:36:36 -0400606{
Joe Perches0ff2ea72010-12-19 22:43:19 -0500607 struct va_format vaf;
Eric Sandeenb31e1552009-06-04 17:36:36 -0400608 va_list args;
609
Theodore Ts'oefbed4d2013-10-17 21:11:01 -0400610 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
611 return;
612
Eric Sandeenb31e1552009-06-04 17:36:36 -0400613 va_start(args, fmt);
Joe Perches0ff2ea72010-12-19 22:43:19 -0500614 vaf.fmt = fmt;
615 vaf.va = &args;
616 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
Eric Sandeenb31e1552009-06-04 17:36:36 -0400617 va_end(args);
618}
619
Eric Sandeen12062dd2010-02-15 14:19:27 -0500620void __ext4_warning(struct super_block *sb, const char *function,
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400621 unsigned int line, const char *fmt, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700622{
Joe Perches0ff2ea72010-12-19 22:43:19 -0500623 struct va_format vaf;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700624 va_list args;
625
Theodore Ts'oefbed4d2013-10-17 21:11:01 -0400626 if (!___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state),
627 "EXT4-fs warning"))
628 return;
629
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700630 va_start(args, fmt);
Joe Perches0ff2ea72010-12-19 22:43:19 -0500631 vaf.fmt = fmt;
632 vaf.va = &args;
633 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
634 sb->s_id, function, line, &vaf);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700635 va_end(args);
636}
637
Theodore Ts'oe29136f2010-06-29 12:54:28 -0400638void __ext4_grp_locked_error(const char *function, unsigned int line,
639 struct super_block *sb, ext4_group_t grp,
640 unsigned long ino, ext4_fsblk_t block,
641 const char *fmt, ...)
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -0500642__releases(bitlock)
643__acquires(bitlock)
644{
Joe Perches0ff2ea72010-12-19 22:43:19 -0500645 struct va_format vaf;
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -0500646 va_list args;
647 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
648
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400649 es->s_last_error_ino = cpu_to_le32(ino);
650 es->s_last_error_block = cpu_to_le64(block);
651 __save_error_info(sb, function, line);
Joe Perches0ff2ea72010-12-19 22:43:19 -0500652
Theodore Ts'oefbed4d2013-10-17 21:11:01 -0400653 if (ext4_error_ratelimit(sb)) {
654 va_start(args, fmt);
655 vaf.fmt = fmt;
656 vaf.va = &args;
657 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
658 sb->s_id, function, line, grp);
659 if (ino)
660 printk(KERN_CONT "inode %lu: ", ino);
661 if (block)
662 printk(KERN_CONT "block %llu:",
663 (unsigned long long) block);
664 printk(KERN_CONT "%pV\n", &vaf);
665 va_end(args);
666 }
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -0500667
668 if (test_opt(sb, ERRORS_CONT)) {
Theodore Ts'oe2d67052009-05-01 00:33:44 -0400669 ext4_commit_super(sb, 0);
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -0500670 return;
671 }
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400672
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -0500673 ext4_unlock_group(sb, grp);
674 ext4_handle_error(sb);
675 /*
676 * We only get here in the ERRORS_RO case; relocking the group
677 * may be dangerous, but nothing bad will happen since the
678 * filesystem will have already been marked read/only and the
679 * journal has been aborted. We return 1 as a hint to callers
680 * who might what to use the return value from
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300681 * ext4_grp_locked_error() to distinguish between the
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -0500682 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
683 * aggressively from the ext4 function in question, with a
684 * more appropriate error code.
685 */
686 ext4_lock_group(sb, grp);
687 return;
688}
689
Mingming Cao617ba132006-10-11 01:20:53 -0700690void ext4_update_dynamic_rev(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700691{
Mingming Cao617ba132006-10-11 01:20:53 -0700692 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700693
Mingming Cao617ba132006-10-11 01:20:53 -0700694 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700695 return;
696
Eric Sandeen12062dd2010-02-15 14:19:27 -0500697 ext4_warning(sb,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700698 "updating to rev %d because of new feature flag, "
699 "running e2fsck is recommended",
Mingming Cao617ba132006-10-11 01:20:53 -0700700 EXT4_DYNAMIC_REV);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700701
Mingming Cao617ba132006-10-11 01:20:53 -0700702 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
703 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
704 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700705 /* leave es->s_feature_*compat flags alone */
706 /* es->s_uuid will be set by e2fsck if empty */
707
708 /*
709 * The rest of the superblock fields should be zero, and if not it
710 * means they are likely already in use, so leave them alone. We
711 * can leave it up to e2fsck to clean up any inconsistencies there.
712 */
713}
714
715/*
716 * Open the external journal device
717 */
Eric Sandeenb31e1552009-06-04 17:36:36 -0400718static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700719{
720 struct block_device *bdev;
721 char b[BDEVNAME_SIZE];
722
Tejun Heod4d77622010-11-13 11:55:18 +0100723 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700724 if (IS_ERR(bdev))
725 goto fail;
726 return bdev;
727
728fail:
Eric Sandeenb31e1552009-06-04 17:36:36 -0400729 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700730 __bdevname(dev, b), PTR_ERR(bdev));
731 return NULL;
732}
733
734/*
735 * Release the journal device
736 */
Al Viro4385bab2013-05-05 22:11:03 -0400737static void ext4_blkdev_put(struct block_device *bdev)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700738{
Al Viro4385bab2013-05-05 22:11:03 -0400739 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700740}
741
Al Viro4385bab2013-05-05 22:11:03 -0400742static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700743{
744 struct block_device *bdev;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700745 bdev = sbi->journal_bdev;
746 if (bdev) {
Al Viro4385bab2013-05-05 22:11:03 -0400747 ext4_blkdev_put(bdev);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700748 sbi->journal_bdev = NULL;
749 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700750}
751
752static inline struct inode *orphan_list_entry(struct list_head *l)
753{
Mingming Cao617ba132006-10-11 01:20:53 -0700754 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700755}
756
Mingming Cao617ba132006-10-11 01:20:53 -0700757static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700758{
759 struct list_head *l;
760
Eric Sandeenb31e1552009-06-04 17:36:36 -0400761 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
762 le32_to_cpu(sbi->s_es->s_last_orphan));
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700763
764 printk(KERN_ERR "sb_info orphan list:\n");
765 list_for_each(l, &sbi->s_orphan) {
766 struct inode *inode = orphan_list_entry(l);
767 printk(KERN_ERR " "
768 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
769 inode->i_sb->s_id, inode->i_ino, inode,
770 inode->i_mode, inode->i_nlink,
771 NEXT_ORPHAN(inode));
772 }
773}
774
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400775static void ext4_put_super(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700776{
Mingming Cao617ba132006-10-11 01:20:53 -0700777 struct ext4_sb_info *sbi = EXT4_SB(sb);
778 struct ext4_super_block *es = sbi->s_es;
Hidehiro Kawaief2cabf2008-10-27 22:53:05 -0400779 int i, err;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700780
Lukas Czerner857ac882010-10-27 21:30:05 -0400781 ext4_unregister_li_request(sb);
Christoph Hellwige0ccfd92010-05-19 07:16:42 -0400782 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
783
Jan Kara2e8fa542013-06-04 14:21:02 -0400784 flush_workqueue(sbi->rsv_conversion_wq);
Jan Kara2e8fa542013-06-04 14:21:02 -0400785 destroy_workqueue(sbi->rsv_conversion_wq);
Mingming Cao4c0425f2009-09-28 15:48:41 -0400786
Frank Mayhar03901312009-01-07 00:06:22 -0500787 if (sbi->s_journal) {
788 err = jbd2_journal_destroy(sbi->s_journal);
789 sbi->s_journal = NULL;
790 if (err < 0)
Theodore Ts'oc67d8592010-06-29 11:07:07 -0400791 ext4_abort(sb, "Couldn't clean up the journal");
Frank Mayhar03901312009-01-07 00:06:22 -0500792 }
Josef Bacikd4edac32009-12-08 21:48:58 -0500793
Zheng Liud3922a72013-07-01 08:12:37 -0400794 ext4_es_unregister_shrinker(sbi);
Al Viro9105bb12013-12-08 20:52:31 -0500795 del_timer_sync(&sbi->s_err_report);
Josef Bacikd4edac32009-12-08 21:48:58 -0500796 ext4_release_system_zone(sb);
797 ext4_mb_release(sb);
798 ext4_ext_release(sb);
799 ext4_xattr_put_super(sb);
800
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700801 if (!(sb->s_flags & MS_RDONLY)) {
Mingming Cao617ba132006-10-11 01:20:53 -0700802 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700803 es->s_state = cpu_to_le16(sbi->s_mount_state);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700804 }
Artem Bityutskiy58c58732012-07-22 20:33:31 -0400805 if (!(sb->s_flags & MS_RDONLY))
Artem Bityutskiya8e25a82012-03-21 22:29:15 -0400806 ext4_commit_super(sb, 1);
807
Theodore Ts'o240799c2008-10-09 23:53:47 -0400808 if (sbi->s_proc) {
Theodore Ts'o66acdcf2012-03-04 20:21:38 -0500809 remove_proc_entry("options", sbi->s_proc);
Theodore Ts'o9f6200b2008-09-23 09:18:24 -0400810 remove_proc_entry(sb->s_id, ext4_proc_root);
Theodore Ts'o240799c2008-10-09 23:53:47 -0400811 }
Theodore Ts'o3197ebd2009-03-31 09:10:09 -0400812 kobject_del(&sbi->s_kobj);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700813
814 for (i = 0; i < sbi->s_gdb_count; i++)
815 brelse(sbi->s_group_desc[i]);
Theodore Ts'of18a5f22011-08-01 08:45:38 -0400816 ext4_kvfree(sbi->s_group_desc);
Theodore Ts'o9933fc02011-08-01 08:45:02 -0400817 ext4_kvfree(sbi->s_flex_groups);
Theodore Ts'o57042652011-09-09 18:56:51 -0400818 percpu_counter_destroy(&sbi->s_freeclusters_counter);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700819 percpu_counter_destroy(&sbi->s_freeinodes_counter);
820 percpu_counter_destroy(&sbi->s_dirs_counter);
Theodore Ts'o57042652011-09-09 18:56:51 -0400821 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
Theodore Ts'o1ac64662013-03-02 10:27:46 -0500822 percpu_counter_destroy(&sbi->s_extent_cache_cnt);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700823 brelse(sbi->s_sbh);
824#ifdef CONFIG_QUOTA
825 for (i = 0; i < MAXQUOTAS; i++)
826 kfree(sbi->s_qf_names[i]);
827#endif
828
829 /* Debugging code just in case the in-memory inode orphan list
830 * isn't empty. The on-disk one can be non-empty if we've
831 * detected an error and taken the fs readonly, but the
832 * in-memory list had better be clean by this point. */
833 if (!list_empty(&sbi->s_orphan))
834 dump_orphan_list(sb, sbi);
835 J_ASSERT(list_empty(&sbi->s_orphan));
836
Peter Zijlstraf98393a2007-05-06 14:49:54 -0700837 invalidate_bdev(sb->s_bdev);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700838 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
839 /*
840 * Invalidate the journal device's buffers. We don't want them
841 * floating about in memory - the physical journal device may
842 * hotswapped, and it breaks the `ro-after' testing code.
843 */
844 sync_blockdev(sbi->journal_bdev);
Peter Zijlstraf98393a2007-05-06 14:49:54 -0700845 invalidate_bdev(sbi->journal_bdev);
Mingming Cao617ba132006-10-11 01:20:53 -0700846 ext4_blkdev_remove(sbi);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700847 }
Johann Lombardic5e06d12011-05-24 18:31:25 -0400848 if (sbi->s_mmp_tsk)
849 kthread_stop(sbi->s_mmp_tsk);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700850 sb->s_fs_info = NULL;
Theodore Ts'o3197ebd2009-03-31 09:10:09 -0400851 /*
852 * Now that we are completely done shutting down the
853 * superblock, we need to actually destroy the kobject.
854 */
Theodore Ts'o3197ebd2009-03-31 09:10:09 -0400855 kobject_put(&sbi->s_kobj);
856 wait_for_completion(&sbi->s_kobj_unregister);
Darrick J. Wong04419842012-04-29 18:27:10 -0400857 if (sbi->s_chksum_driver)
858 crypto_free_shash(sbi->s_chksum_driver);
Pekka Enberg705895b2009-02-15 18:07:52 -0500859 kfree(sbi->s_blockgroup_lock);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700860 kfree(sbi);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700861}
862
Christoph Lametere18b8902006-12-06 20:33:20 -0800863static struct kmem_cache *ext4_inode_cachep;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700864
865/*
866 * Called inside transaction, so use GFP_NOFS
867 */
Mingming Cao617ba132006-10-11 01:20:53 -0700868static struct inode *ext4_alloc_inode(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700869{
Mingming Cao617ba132006-10-11 01:20:53 -0700870 struct ext4_inode_info *ei;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700871
Christoph Lametere6b4f8d2006-12-06 20:33:14 -0800872 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700873 if (!ei)
874 return NULL;
Andreas Dilger0b8e58a2009-06-03 17:59:28 -0400875
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700876 ei->vfs_inode.i_version = 1;
Alex Tomasc9de5602008-01-29 00:19:52 -0500877 INIT_LIST_HEAD(&ei->i_prealloc_list);
878 spin_lock_init(&ei->i_prealloc_lock);
Zheng Liu9a26b662012-11-08 21:57:30 -0500879 ext4_es_init_tree(&ei->i_es_tree);
880 rwlock_init(&ei->i_es_lock);
Zheng Liu74cd15c2013-02-18 00:32:55 -0500881 INIT_LIST_HEAD(&ei->i_es_lru);
882 ei->i_es_lru_nr = 0;
Zheng Liud3922a72013-07-01 08:12:37 -0400883 ei->i_touch_when = 0;
Mingming Caod2a17632008-07-14 17:52:37 -0400884 ei->i_reserved_data_blocks = 0;
885 ei->i_reserved_meta_blocks = 0;
886 ei->i_allocated_meta_blocks = 0;
Theodore Ts'o9d0be502010-01-01 02:41:30 -0500887 ei->i_da_metadata_calc_len = 0;
Theodore Ts'o7e731bc2012-08-05 23:28:16 -0400888 ei->i_da_metadata_calc_last_lblock = 0;
Mingming Caod2a17632008-07-14 17:52:37 -0400889 spin_lock_init(&(ei->i_block_reservation_lock));
Dmitry Monakhova9e7f442009-12-14 15:21:14 +0300890#ifdef CONFIG_QUOTA
891 ei->i_reserved_quota = 0;
892#endif
Theodore Ts'o8aefcd52011-01-10 12:29:43 -0500893 ei->jinode = NULL;
Jan Kara2e8fa542013-06-04 14:21:02 -0400894 INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
Jiaying Zhang744692d2010-03-04 16:14:02 -0500895 spin_lock_init(&ei->i_completed_io_lock);
Jan Karab436b9b2009-12-08 23:51:10 -0500896 ei->i_sync_tid = 0;
897 ei->i_datasync_tid = 0;
Theodore Ts'of7ad6d22010-11-08 13:43:33 -0500898 atomic_set(&ei->i_ioend_count, 0);
Dmitry Monakhove27f41e2012-09-28 23:24:52 -0400899 atomic_set(&ei->i_unwritten, 0);
Jan Kara2e8fa542013-06-04 14:21:02 -0400900 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
Andreas Dilger0b8e58a2009-06-03 17:59:28 -0400901
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700902 return &ei->vfs_inode;
903}
904
Theodore Ts'o7ff9c072010-11-08 13:51:33 -0500905static int ext4_drop_inode(struct inode *inode)
906{
907 int drop = generic_drop_inode(inode);
908
909 trace_ext4_drop_inode(inode, drop);
910 return drop;
911}
912
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100913static void ext4_i_callback(struct rcu_head *head)
914{
915 struct inode *inode = container_of(head, struct inode, i_rcu);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100916 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
917}
918
Mingming Cao617ba132006-10-11 01:20:53 -0700919static void ext4_destroy_inode(struct inode *inode)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700920{
Vasily Averin9f7dd932007-07-15 23:40:45 -0700921 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
Eric Sandeenb31e1552009-06-04 17:36:36 -0400922 ext4_msg(inode->i_sb, KERN_ERR,
923 "Inode %lu (%p): orphan list check failed!",
924 inode->i_ino, EXT4_I(inode));
Vasily Averin9f7dd932007-07-15 23:40:45 -0700925 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
926 EXT4_I(inode), sizeof(struct ext4_inode_info),
927 true);
928 dump_stack();
929 }
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100930 call_rcu(&inode->i_rcu, ext4_i_callback);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700931}
932
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700933static void init_once(void *foo)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700934{
Mingming Cao617ba132006-10-11 01:20:53 -0700935 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700936
Christoph Lametera35afb82007-05-16 22:10:57 -0700937 INIT_LIST_HEAD(&ei->i_orphan);
Christoph Lametera35afb82007-05-16 22:10:57 -0700938 init_rwsem(&ei->xattr_sem);
Aneesh Kumar K.V0e855ac2008-01-28 23:58:26 -0500939 init_rwsem(&ei->i_data_sem);
Christoph Lametera35afb82007-05-16 22:10:57 -0700940 inode_init_once(&ei->vfs_inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700941}
942
943static int init_inodecache(void)
944{
Mingming Cao617ba132006-10-11 01:20:53 -0700945 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
946 sizeof(struct ext4_inode_info),
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700947 0, (SLAB_RECLAIM_ACCOUNT|
948 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900949 init_once);
Mingming Cao617ba132006-10-11 01:20:53 -0700950 if (ext4_inode_cachep == NULL)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700951 return -ENOMEM;
952 return 0;
953}
954
955static void destroy_inodecache(void)
956{
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +1000957 /*
958 * Make sure all delayed rcu free inodes are flushed before we
959 * destroy cache.
960 */
961 rcu_barrier();
Mingming Cao617ba132006-10-11 01:20:53 -0700962 kmem_cache_destroy(ext4_inode_cachep);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700963}
964
Al Viro0930fcc2010-06-07 13:16:22 -0400965void ext4_clear_inode(struct inode *inode)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700966{
Al Viro0930fcc2010-06-07 13:16:22 -0400967 invalidate_inode_buffers(inode);
Jan Karadbd57682012-05-03 14:48:02 +0200968 clear_inode(inode);
Christoph Hellwig9f754752010-03-03 09:05:05 -0500969 dquot_drop(inode);
Theodore Ts'oc2ea3fd2008-10-10 09:40:52 -0400970 ext4_discard_preallocations(inode);
Zheng Liu51865fd2012-11-08 21:57:32 -0500971 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
Zheng Liu74cd15c2013-02-18 00:32:55 -0500972 ext4_es_lru_del(inode);
Theodore Ts'o8aefcd52011-01-10 12:29:43 -0500973 if (EXT4_I(inode)->jinode) {
974 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
975 EXT4_I(inode)->jinode);
976 jbd2_free_inode(EXT4_I(inode)->jinode);
977 EXT4_I(inode)->jinode = NULL;
978 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700979}
980
Christoph Hellwig1b961ac2007-10-21 16:42:08 -0700981static struct inode *ext4_nfs_get_inode(struct super_block *sb,
Andreas Dilger0b8e58a2009-06-03 17:59:28 -0400982 u64 ino, u32 generation)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700983{
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700984 struct inode *inode;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700985
Mingming Cao617ba132006-10-11 01:20:53 -0700986 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700987 return ERR_PTR(-ESTALE);
Mingming Cao617ba132006-10-11 01:20:53 -0700988 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700989 return ERR_PTR(-ESTALE);
990
991 /* iget isn't really right if the inode is currently unallocated!!
992 *
Mingming Cao617ba132006-10-11 01:20:53 -0700993 * ext4_read_inode will return a bad_inode if the inode had been
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700994 * deleted, so we should be safe.
995 *
996 * Currently we don't know the generation for parent directory, so
997 * a generation of 0 means "accept any"
998 */
David Howells1d1fe1e2008-02-07 00:15:37 -0800999 inode = ext4_iget(sb, ino);
1000 if (IS_ERR(inode))
1001 return ERR_CAST(inode);
1002 if (generation && inode->i_generation != generation) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001003 iput(inode);
1004 return ERR_PTR(-ESTALE);
1005 }
Christoph Hellwig1b961ac2007-10-21 16:42:08 -07001006
1007 return inode;
1008}
1009
1010static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04001011 int fh_len, int fh_type)
Christoph Hellwig1b961ac2007-10-21 16:42:08 -07001012{
1013 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1014 ext4_nfs_get_inode);
1015}
1016
1017static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04001018 int fh_len, int fh_type)
Christoph Hellwig1b961ac2007-10-21 16:42:08 -07001019{
1020 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1021 ext4_nfs_get_inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001022}
1023
Toshiyuki Okajimac39a7f82009-01-05 22:38:48 -05001024/*
1025 * Try to release metadata pages (indirect blocks, directories) which are
1026 * mapped via the block device. Since these pages could have journal heads
1027 * which would prevent try_to_free_buffers() from freeing them, we must use
1028 * jbd2 layer's try_to_free_buffers() function to release them.
1029 */
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04001030static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1031 gfp_t wait)
Toshiyuki Okajimac39a7f82009-01-05 22:38:48 -05001032{
1033 journal_t *journal = EXT4_SB(sb)->s_journal;
1034
1035 WARN_ON(PageChecked(page));
1036 if (!page_has_buffers(page))
1037 return 0;
1038 if (journal)
1039 return jbd2_journal_try_to_free_buffers(journal, page,
1040 wait & ~__GFP_WAIT);
1041 return try_to_free_buffers(page);
1042}
1043
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001044#ifdef CONFIG_QUOTA
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001045#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001046#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001047
Mingming Cao617ba132006-10-11 01:20:53 -07001048static int ext4_write_dquot(struct dquot *dquot);
1049static int ext4_acquire_dquot(struct dquot *dquot);
1050static int ext4_release_dquot(struct dquot *dquot);
1051static int ext4_mark_dquot_dirty(struct dquot *dquot);
1052static int ext4_write_info(struct super_block *sb, int type);
Jan Kara6f28e082008-04-28 02:14:34 -07001053static int ext4_quota_on(struct super_block *sb, int type, int format_id,
Jan Karaf00c9e42010-09-15 17:38:58 +02001054 struct path *path);
Aditya Kali7c319d32012-07-22 20:21:31 -04001055static int ext4_quota_on_sysfile(struct super_block *sb, int type,
1056 int format_id);
Dmitry Monakhovca0e05e2010-08-01 17:48:36 -04001057static int ext4_quota_off(struct super_block *sb, int type);
Aditya Kali7c319d32012-07-22 20:21:31 -04001058static int ext4_quota_off_sysfile(struct super_block *sb, int type);
Mingming Cao617ba132006-10-11 01:20:53 -07001059static int ext4_quota_on_mount(struct super_block *sb, int type);
1060static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001061 size_t len, loff_t off);
Mingming Cao617ba132006-10-11 01:20:53 -07001062static ssize_t ext4_quota_write(struct super_block *sb, int type,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001063 const char *data, size_t len, loff_t off);
Aditya Kali7c319d32012-07-22 20:21:31 -04001064static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1065 unsigned int flags);
1066static int ext4_enable_quotas(struct super_block *sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001067
Alexey Dobriyan61e225d2009-09-21 17:01:08 -07001068static const struct dquot_operations ext4_quota_operations = {
Mingming Cao60e58e02009-01-22 18:13:05 +01001069 .get_reserved_space = ext4_get_reserved_space,
Mingming Cao617ba132006-10-11 01:20:53 -07001070 .write_dquot = ext4_write_dquot,
1071 .acquire_dquot = ext4_acquire_dquot,
1072 .release_dquot = ext4_release_dquot,
1073 .mark_dirty = ext4_mark_dquot_dirty,
Jan Karaa5b5ee32008-11-25 15:31:35 +01001074 .write_info = ext4_write_info,
1075 .alloc_dquot = dquot_alloc,
1076 .destroy_dquot = dquot_destroy,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001077};
1078
Alexey Dobriyan0d54b212009-09-21 17:01:09 -07001079static const struct quotactl_ops ext4_qctl_operations = {
Mingming Cao617ba132006-10-11 01:20:53 -07001080 .quota_on = ext4_quota_on,
Dmitry Monakhovca0e05e2010-08-01 17:48:36 -04001081 .quota_off = ext4_quota_off,
Christoph Hellwig287a8092010-05-19 07:16:45 -04001082 .quota_sync = dquot_quota_sync,
1083 .get_info = dquot_get_dqinfo,
1084 .set_info = dquot_set_dqinfo,
1085 .get_dqblk = dquot_get_dqblk,
1086 .set_dqblk = dquot_set_dqblk
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001087};
Aditya Kali7c319d32012-07-22 20:21:31 -04001088
1089static const struct quotactl_ops ext4_qctl_sysfile_operations = {
1090 .quota_on_meta = ext4_quota_on_sysfile,
1091 .quota_off = ext4_quota_off_sysfile,
1092 .quota_sync = dquot_quota_sync,
1093 .get_info = dquot_get_dqinfo,
1094 .set_info = dquot_set_dqinfo,
1095 .get_dqblk = dquot_get_dqblk,
1096 .set_dqblk = dquot_set_dqblk
1097};
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001098#endif
1099
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -08001100static const struct super_operations ext4_sops = {
Mingming Cao617ba132006-10-11 01:20:53 -07001101 .alloc_inode = ext4_alloc_inode,
1102 .destroy_inode = ext4_destroy_inode,
Mingming Cao617ba132006-10-11 01:20:53 -07001103 .write_inode = ext4_write_inode,
1104 .dirty_inode = ext4_dirty_inode,
Theodore Ts'o7ff9c072010-11-08 13:51:33 -05001105 .drop_inode = ext4_drop_inode,
Al Viro0930fcc2010-06-07 13:16:22 -04001106 .evict_inode = ext4_evict_inode,
Mingming Cao617ba132006-10-11 01:20:53 -07001107 .put_super = ext4_put_super,
Mingming Cao617ba132006-10-11 01:20:53 -07001108 .sync_fs = ext4_sync_fs,
Takashi Satoc4be0c12009-01-09 16:40:58 -08001109 .freeze_fs = ext4_freeze,
1110 .unfreeze_fs = ext4_unfreeze,
Mingming Cao617ba132006-10-11 01:20:53 -07001111 .statfs = ext4_statfs,
1112 .remount_fs = ext4_remount,
Mingming Cao617ba132006-10-11 01:20:53 -07001113 .show_options = ext4_show_options,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001114#ifdef CONFIG_QUOTA
Mingming Cao617ba132006-10-11 01:20:53 -07001115 .quota_read = ext4_quota_read,
1116 .quota_write = ext4_quota_write,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001117#endif
Toshiyuki Okajimac39a7f82009-01-05 22:38:48 -05001118 .bdev_try_to_free_page = bdev_try_to_free_page,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001119};
1120
Theodore Ts'o9ca92382009-05-01 12:52:25 -04001121static const struct super_operations ext4_nojournal_sops = {
1122 .alloc_inode = ext4_alloc_inode,
1123 .destroy_inode = ext4_destroy_inode,
1124 .write_inode = ext4_write_inode,
1125 .dirty_inode = ext4_dirty_inode,
Theodore Ts'o7ff9c072010-11-08 13:51:33 -05001126 .drop_inode = ext4_drop_inode,
Al Viro0930fcc2010-06-07 13:16:22 -04001127 .evict_inode = ext4_evict_inode,
Dmitry Monakhov06a407f2013-06-12 22:25:07 -04001128 .sync_fs = ext4_sync_fs_nojournal,
Theodore Ts'o9ca92382009-05-01 12:52:25 -04001129 .put_super = ext4_put_super,
1130 .statfs = ext4_statfs,
1131 .remount_fs = ext4_remount,
Theodore Ts'o9ca92382009-05-01 12:52:25 -04001132 .show_options = ext4_show_options,
1133#ifdef CONFIG_QUOTA
1134 .quota_read = ext4_quota_read,
1135 .quota_write = ext4_quota_write,
1136#endif
1137 .bdev_try_to_free_page = bdev_try_to_free_page,
1138};
1139
Christoph Hellwig39655162007-10-21 16:42:17 -07001140static const struct export_operations ext4_export_ops = {
Christoph Hellwig1b961ac2007-10-21 16:42:08 -07001141 .fh_to_dentry = ext4_fh_to_dentry,
1142 .fh_to_parent = ext4_fh_to_parent,
Mingming Cao617ba132006-10-11 01:20:53 -07001143 .get_parent = ext4_get_parent,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001144};
1145
1146enum {
1147 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1148 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
Theodore Ts'o72578c32012-03-03 18:04:40 -05001149 Opt_nouid32, Opt_debug, Opt_removed,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001150 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
Theodore Ts'o72578c32012-03-03 18:04:40 -05001151 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
Eric Sandeenad4eec62013-08-28 19:05:07 -04001152 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1153 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001154 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
Theodore Ts'o296c3552009-09-30 00:32:42 -04001155 Opt_data_err_abort, Opt_data_err_ignore,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001156 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
Jan Kara5a20bdf2009-11-30 23:58:32 +01001157 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
Theodore Ts'oee4a3fc2012-03-02 12:14:24 -05001158 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
Eric Sandeen661aa522012-02-20 17:53:04 -05001159 Opt_usrquota, Opt_grpquota, Opt_i_version,
Theodore Ts'o14490322010-12-14 15:27:50 -05001160 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1161 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
Eric Sandeen5328e632009-11-19 14:25:42 -05001162 Opt_inode_readahead_blks, Opt_journal_ioprio,
Jiaying Zhang744692d2010-03-04 16:14:02 -05001163 Opt_dioread_nolock, Opt_dioread_lock,
Theodore Ts'ofc6cb1c2011-12-12 22:06:18 -05001164 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
Theodore Ts'odf981d02012-08-17 09:48:17 -04001165 Opt_max_dir_size_kb,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001166};
1167
Steven Whitehousea447c092008-10-13 10:46:57 +01001168static const match_table_t tokens = {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001169 {Opt_bsd_df, "bsddf"},
1170 {Opt_minix_df, "minixdf"},
1171 {Opt_grpid, "grpid"},
1172 {Opt_grpid, "bsdgroups"},
1173 {Opt_nogrpid, "nogrpid"},
1174 {Opt_nogrpid, "sysvgroups"},
1175 {Opt_resgid, "resgid=%u"},
1176 {Opt_resuid, "resuid=%u"},
1177 {Opt_sb, "sb=%u"},
1178 {Opt_err_cont, "errors=continue"},
1179 {Opt_err_panic, "errors=panic"},
1180 {Opt_err_ro, "errors=remount-ro"},
1181 {Opt_nouid32, "nouid32"},
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001182 {Opt_debug, "debug"},
Theodore Ts'o72578c32012-03-03 18:04:40 -05001183 {Opt_removed, "oldalloc"},
1184 {Opt_removed, "orlov"},
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001185 {Opt_user_xattr, "user_xattr"},
1186 {Opt_nouser_xattr, "nouser_xattr"},
1187 {Opt_acl, "acl"},
1188 {Opt_noacl, "noacl"},
Eric Sandeene3bb52a2009-11-19 14:28:50 -05001189 {Opt_noload, "norecovery"},
Theodore Ts'o5a916be2012-03-04 19:27:31 -05001190 {Opt_noload, "noload"},
Theodore Ts'o72578c32012-03-03 18:04:40 -05001191 {Opt_removed, "nobh"},
1192 {Opt_removed, "bh"},
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001193 {Opt_commit, "commit=%u"},
Theodore Ts'o30773842009-01-03 20:27:38 -05001194 {Opt_min_batch_time, "min_batch_time=%u"},
1195 {Opt_max_batch_time, "max_batch_time=%u"},
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001196 {Opt_journal_dev, "journal_dev=%u"},
Eric Sandeenad4eec62013-08-28 19:05:07 -04001197 {Opt_journal_path, "journal_path=%s"},
Girish Shilamkar818d2762008-01-28 23:58:27 -05001198 {Opt_journal_checksum, "journal_checksum"},
1199 {Opt_journal_async_commit, "journal_async_commit"},
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001200 {Opt_abort, "abort"},
1201 {Opt_data_journal, "data=journal"},
1202 {Opt_data_ordered, "data=ordered"},
1203 {Opt_data_writeback, "data=writeback"},
Hidehiro Kawai5bf56832008-10-10 22:12:43 -04001204 {Opt_data_err_abort, "data_err=abort"},
1205 {Opt_data_err_ignore, "data_err=ignore"},
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001206 {Opt_offusrjquota, "usrjquota="},
1207 {Opt_usrjquota, "usrjquota=%s"},
1208 {Opt_offgrpjquota, "grpjquota="},
1209 {Opt_grpjquota, "grpjquota=%s"},
1210 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1211 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
Jan Kara5a20bdf2009-11-30 23:58:32 +01001212 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001213 {Opt_grpquota, "grpquota"},
1214 {Opt_noquota, "noquota"},
1215 {Opt_quota, "quota"},
1216 {Opt_usrquota, "usrquota"},
1217 {Opt_barrier, "barrier=%u"},
Theodore Ts'o06705bf2009-03-28 10:59:57 -04001218 {Opt_barrier, "barrier"},
1219 {Opt_nobarrier, "nobarrier"},
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -05001220 {Opt_i_version, "i_version"},
Alex Tomasc9de5602008-01-29 00:19:52 -05001221 {Opt_stripe, "stripe=%u"},
Alex Tomas64769242008-07-11 19:27:31 -04001222 {Opt_delalloc, "delalloc"},
Aneesh Kumar K.Vdd919b92008-07-11 19:27:31 -04001223 {Opt_nodelalloc, "nodelalloc"},
Jan Kara36ade452013-01-28 09:30:52 -05001224 {Opt_removed, "mblk_io_submit"},
1225 {Opt_removed, "nomblk_io_submit"},
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04001226 {Opt_block_validity, "block_validity"},
1227 {Opt_noblock_validity, "noblock_validity"},
Theodore Ts'o240799c2008-10-09 23:53:47 -04001228 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
Theodore Ts'ob3881f72009-01-05 22:46:26 -05001229 {Opt_journal_ioprio, "journal_ioprio=%u"},
Theodore Ts'oafd46722009-03-16 23:12:23 -04001230 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
Theodore Ts'o06705bf2009-03-28 10:59:57 -04001231 {Opt_auto_da_alloc, "auto_da_alloc"},
1232 {Opt_noauto_da_alloc, "noauto_da_alloc"},
Jiaying Zhang744692d2010-03-04 16:14:02 -05001233 {Opt_dioread_nolock, "dioread_nolock"},
1234 {Opt_dioread_lock, "dioread_lock"},
Eric Sandeen5328e632009-11-19 14:25:42 -05001235 {Opt_discard, "discard"},
1236 {Opt_nodiscard, "nodiscard"},
Theodore Ts'ofc6cb1c2011-12-12 22:06:18 -05001237 {Opt_init_itable, "init_itable=%u"},
1238 {Opt_init_itable, "init_itable"},
1239 {Opt_noinit_itable, "noinit_itable"},
Theodore Ts'odf981d02012-08-17 09:48:17 -04001240 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
Theodore Ts'oc7198b92012-03-04 22:00:53 -05001241 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1242 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1243 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1244 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1245 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
Josef Bacikf3f12fa2008-04-29 22:05:28 -04001246 {Opt_err, NULL},
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001247};
1248
Mingming Cao617ba132006-10-11 01:20:53 -07001249static ext4_fsblk_t get_sb_block(void **data)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001250{
Mingming Cao617ba132006-10-11 01:20:53 -07001251 ext4_fsblk_t sb_block;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001252 char *options = (char *) *data;
1253
1254 if (!options || strncmp(options, "sb=", 3) != 0)
1255 return 1; /* Default location */
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04001256
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001257 options += 3;
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04001258 /* TODO: use simple_strtoll with >32bit ext4 */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001259 sb_block = simple_strtoul(options, &options, 0);
1260 if (*options && *options != ',') {
Theodore Ts'o4776004f2008-09-08 23:00:52 -04001261 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001262 (char *) *data);
1263 return 1;
1264 }
1265 if (*options == ',')
1266 options++;
1267 *data = (void *) options;
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04001268
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001269 return sb_block;
1270}
1271
Theodore Ts'ob3881f72009-01-05 22:46:26 -05001272#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
Dmitry Monakhov437ca0f2010-03-01 22:29:21 -05001273static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1274 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
Theodore Ts'ob3881f72009-01-05 22:46:26 -05001275
Dmitry Monakhov56c50f12010-03-01 23:28:41 -05001276#ifdef CONFIG_QUOTA
1277static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1278{
1279 struct ext4_sb_info *sbi = EXT4_SB(sb);
1280 char *qname;
Chen Gang03dafb52013-01-24 23:24:58 -05001281 int ret = -1;
Dmitry Monakhov56c50f12010-03-01 23:28:41 -05001282
1283 if (sb_any_quota_loaded(sb) &&
1284 !sbi->s_qf_names[qtype]) {
1285 ext4_msg(sb, KERN_ERR,
1286 "Cannot change journaled "
1287 "quota options when quota turned on");
Theodore Ts'o57f73c22012-04-16 18:55:26 -04001288 return -1;
Dmitry Monakhov56c50f12010-03-01 23:28:41 -05001289 }
Jan Kara262b4662013-03-02 17:57:08 -05001290 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) {
1291 ext4_msg(sb, KERN_ERR, "Cannot set journaled quota options "
1292 "when QUOTA feature is enabled");
1293 return -1;
1294 }
Dmitry Monakhov56c50f12010-03-01 23:28:41 -05001295 qname = match_strdup(args);
1296 if (!qname) {
1297 ext4_msg(sb, KERN_ERR,
1298 "Not enough memory for storing quotafile name");
Theodore Ts'o57f73c22012-04-16 18:55:26 -04001299 return -1;
Dmitry Monakhov56c50f12010-03-01 23:28:41 -05001300 }
Chen Gang03dafb52013-01-24 23:24:58 -05001301 if (sbi->s_qf_names[qtype]) {
1302 if (strcmp(sbi->s_qf_names[qtype], qname) == 0)
1303 ret = 1;
1304 else
1305 ext4_msg(sb, KERN_ERR,
1306 "%s quota file already specified",
1307 QTYPE2NAME(qtype));
1308 goto errout;
Dmitry Monakhov56c50f12010-03-01 23:28:41 -05001309 }
Chen Gang03dafb52013-01-24 23:24:58 -05001310 if (strchr(qname, '/')) {
Dmitry Monakhov56c50f12010-03-01 23:28:41 -05001311 ext4_msg(sb, KERN_ERR,
1312 "quotafile must be on filesystem root");
Chen Gang03dafb52013-01-24 23:24:58 -05001313 goto errout;
Dmitry Monakhov56c50f12010-03-01 23:28:41 -05001314 }
Chen Gang03dafb52013-01-24 23:24:58 -05001315 sbi->s_qf_names[qtype] = qname;
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05001316 set_opt(sb, QUOTA);
Dmitry Monakhov56c50f12010-03-01 23:28:41 -05001317 return 1;
Chen Gang03dafb52013-01-24 23:24:58 -05001318errout:
1319 kfree(qname);
1320 return ret;
Dmitry Monakhov56c50f12010-03-01 23:28:41 -05001321}
1322
1323static int clear_qf_name(struct super_block *sb, int qtype)
1324{
1325
1326 struct ext4_sb_info *sbi = EXT4_SB(sb);
1327
1328 if (sb_any_quota_loaded(sb) &&
1329 sbi->s_qf_names[qtype]) {
1330 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1331 " when quota turned on");
Theodore Ts'o57f73c22012-04-16 18:55:26 -04001332 return -1;
Dmitry Monakhov56c50f12010-03-01 23:28:41 -05001333 }
Chen Gang03dafb52013-01-24 23:24:58 -05001334 kfree(sbi->s_qf_names[qtype]);
Dmitry Monakhov56c50f12010-03-01 23:28:41 -05001335 sbi->s_qf_names[qtype] = NULL;
1336 return 1;
1337}
1338#endif
1339
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001340#define MOPT_SET 0x0001
1341#define MOPT_CLEAR 0x0002
1342#define MOPT_NOSUPPORT 0x0004
1343#define MOPT_EXPLICIT 0x0008
1344#define MOPT_CLEAR_ERR 0x0010
1345#define MOPT_GTE0 0x0020
1346#ifdef CONFIG_QUOTA
1347#define MOPT_Q 0
1348#define MOPT_QFMT 0x0040
1349#else
1350#define MOPT_Q MOPT_NOSUPPORT
1351#define MOPT_QFMT MOPT_NOSUPPORT
1352#endif
1353#define MOPT_DATAJ 0x0080
Theodore Ts'o8dc0aa82013-02-02 23:38:39 -05001354#define MOPT_NO_EXT2 0x0100
1355#define MOPT_NO_EXT3 0x0200
1356#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
Eric Sandeenad4eec62013-08-28 19:05:07 -04001357#define MOPT_STRING 0x0400
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001358
1359static const struct mount_opts {
1360 int token;
1361 int mount_opt;
1362 int flags;
1363} ext4_mount_opts[] = {
1364 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1365 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1366 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1367 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001368 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1369 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
Theodore Ts'o8dc0aa82013-02-02 23:38:39 -05001370 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1371 MOPT_EXT4_ONLY | MOPT_SET},
1372 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1373 MOPT_EXT4_ONLY | MOPT_CLEAR},
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001374 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1375 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
Theodore Ts'o8dc0aa82013-02-02 23:38:39 -05001376 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1377 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1378 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
Theodore Ts'o59d9fa52013-08-08 23:01:24 -04001379 MOPT_EXT4_ONLY | MOPT_CLEAR},
Theodore Ts'o8dc0aa82013-02-02 23:38:39 -05001380 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1381 MOPT_EXT4_ONLY | MOPT_SET},
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001382 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
Theodore Ts'o8dc0aa82013-02-02 23:38:39 -05001383 EXT4_MOUNT_JOURNAL_CHECKSUM),
1384 MOPT_EXT4_ONLY | MOPT_SET},
1385 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001386 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1387 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1388 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
Theodore Ts'o8dc0aa82013-02-02 23:38:39 -05001389 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
1390 MOPT_NO_EXT2 | MOPT_SET},
1391 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
1392 MOPT_NO_EXT2 | MOPT_CLEAR},
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001393 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1394 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1395 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1396 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1397 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1398 {Opt_commit, 0, MOPT_GTE0},
1399 {Opt_max_batch_time, 0, MOPT_GTE0},
1400 {Opt_min_batch_time, 0, MOPT_GTE0},
1401 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1402 {Opt_init_itable, 0, MOPT_GTE0},
1403 {Opt_stripe, 0, MOPT_GTE0},
Jan Kara0efb3b22013-02-02 22:52:19 -05001404 {Opt_resuid, 0, MOPT_GTE0},
1405 {Opt_resgid, 0, MOPT_GTE0},
1406 {Opt_journal_dev, 0, MOPT_GTE0},
Eric Sandeenad4eec62013-08-28 19:05:07 -04001407 {Opt_journal_path, 0, MOPT_STRING},
Jan Kara0efb3b22013-02-02 22:52:19 -05001408 {Opt_journal_ioprio, 0, MOPT_GTE0},
Theodore Ts'o8dc0aa82013-02-02 23:38:39 -05001409 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1410 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1411 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1412 MOPT_NO_EXT2 | MOPT_DATAJ},
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001413 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1414 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001415#ifdef CONFIG_EXT4_FS_POSIX_ACL
1416 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1417 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
1418#else
1419 {Opt_acl, 0, MOPT_NOSUPPORT},
1420 {Opt_noacl, 0, MOPT_NOSUPPORT},
1421#endif
1422 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1423 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1424 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1425 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1426 MOPT_SET | MOPT_Q},
1427 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1428 MOPT_SET | MOPT_Q},
1429 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1430 EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
1431 {Opt_usrjquota, 0, MOPT_Q},
1432 {Opt_grpjquota, 0, MOPT_Q},
1433 {Opt_offusrjquota, 0, MOPT_Q},
1434 {Opt_offgrpjquota, 0, MOPT_Q},
1435 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1436 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1437 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
Theodore Ts'odf981d02012-08-17 09:48:17 -04001438 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001439 {Opt_err, 0, 0}
1440};
1441
1442static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1443 substring_t *args, unsigned long *journal_devnum,
1444 unsigned int *journal_ioprio, int is_remount)
1445{
1446 struct ext4_sb_info *sbi = EXT4_SB(sb);
1447 const struct mount_opts *m;
Eric W. Biederman08cefc72012-02-07 15:41:49 -08001448 kuid_t uid;
1449 kgid_t gid;
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001450 int arg = 0;
1451
Theodore Ts'o57f73c22012-04-16 18:55:26 -04001452#ifdef CONFIG_QUOTA
1453 if (token == Opt_usrjquota)
1454 return set_qf_name(sb, USRQUOTA, &args[0]);
1455 else if (token == Opt_grpjquota)
1456 return set_qf_name(sb, GRPQUOTA, &args[0]);
1457 else if (token == Opt_offusrjquota)
1458 return clear_qf_name(sb, USRQUOTA);
1459 else if (token == Opt_offgrpjquota)
1460 return clear_qf_name(sb, GRPQUOTA);
1461#endif
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001462 switch (token) {
Theodore Ts'of7048602012-03-04 22:06:20 -05001463 case Opt_noacl:
1464 case Opt_nouser_xattr:
1465 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1466 break;
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001467 case Opt_sb:
1468 return 1; /* handled by get_sb_block() */
1469 case Opt_removed:
Jan Kara5f3633e2013-02-02 23:09:36 -05001470 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001471 return 1;
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001472 case Opt_abort:
1473 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1474 return 1;
1475 case Opt_i_version:
1476 sb->s_flags |= MS_I_VERSION;
1477 return 1;
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001478 }
1479
Jan Kara5f3633e2013-02-02 23:09:36 -05001480 for (m = ext4_mount_opts; m->token != Opt_err; m++)
1481 if (token == m->token)
1482 break;
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001483
Jan Kara5f3633e2013-02-02 23:09:36 -05001484 if (m->token == Opt_err) {
1485 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1486 "or missing value", opt);
1487 return -1;
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001488 }
Jan Kara5f3633e2013-02-02 23:09:36 -05001489
Theodore Ts'o8dc0aa82013-02-02 23:38:39 -05001490 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1491 ext4_msg(sb, KERN_ERR,
1492 "Mount option \"%s\" incompatible with ext2", opt);
1493 return -1;
1494 }
1495 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1496 ext4_msg(sb, KERN_ERR,
1497 "Mount option \"%s\" incompatible with ext3", opt);
1498 return -1;
1499 }
1500
Eric Sandeenad4eec62013-08-28 19:05:07 -04001501 if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
Jan Kara5f3633e2013-02-02 23:09:36 -05001502 return -1;
1503 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1504 return -1;
1505 if (m->flags & MOPT_EXPLICIT)
1506 set_opt2(sb, EXPLICIT_DELALLOC);
1507 if (m->flags & MOPT_CLEAR_ERR)
1508 clear_opt(sb, ERRORS_MASK);
1509 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1510 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1511 "options when quota turned on");
1512 return -1;
1513 }
1514
1515 if (m->flags & MOPT_NOSUPPORT) {
1516 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1517 } else if (token == Opt_commit) {
1518 if (arg == 0)
1519 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1520 sbi->s_commit_interval = HZ * arg;
1521 } else if (token == Opt_max_batch_time) {
1522 if (arg == 0)
1523 arg = EXT4_DEF_MAX_BATCH_TIME;
1524 sbi->s_max_batch_time = arg;
1525 } else if (token == Opt_min_batch_time) {
1526 sbi->s_min_batch_time = arg;
1527 } else if (token == Opt_inode_readahead_blks) {
Jan Karae33e60e2013-02-02 23:14:31 -05001528 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
1529 ext4_msg(sb, KERN_ERR,
1530 "EXT4-fs: inode_readahead_blks must be "
1531 "0 or a power of 2 smaller than 2^31");
Jan Kara5f3633e2013-02-02 23:09:36 -05001532 return -1;
1533 }
1534 sbi->s_inode_readahead_blks = arg;
1535 } else if (token == Opt_init_itable) {
1536 set_opt(sb, INIT_INODE_TABLE);
1537 if (!args->from)
1538 arg = EXT4_DEF_LI_WAIT_MULT;
1539 sbi->s_li_wait_mult = arg;
1540 } else if (token == Opt_max_dir_size_kb) {
1541 sbi->s_max_dir_size_kb = arg;
1542 } else if (token == Opt_stripe) {
1543 sbi->s_stripe = arg;
1544 } else if (token == Opt_resuid) {
1545 uid = make_kuid(current_user_ns(), arg);
1546 if (!uid_valid(uid)) {
1547 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
1548 return -1;
1549 }
1550 sbi->s_resuid = uid;
1551 } else if (token == Opt_resgid) {
1552 gid = make_kgid(current_user_ns(), arg);
1553 if (!gid_valid(gid)) {
1554 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1555 return -1;
1556 }
1557 sbi->s_resgid = gid;
1558 } else if (token == Opt_journal_dev) {
1559 if (is_remount) {
1560 ext4_msg(sb, KERN_ERR,
1561 "Cannot specify journal on remount");
1562 return -1;
1563 }
1564 *journal_devnum = arg;
Eric Sandeenad4eec62013-08-28 19:05:07 -04001565 } else if (token == Opt_journal_path) {
1566 char *journal_path;
1567 struct inode *journal_inode;
1568 struct path path;
1569 int error;
1570
1571 if (is_remount) {
1572 ext4_msg(sb, KERN_ERR,
1573 "Cannot specify journal on remount");
1574 return -1;
1575 }
1576 journal_path = match_strdup(&args[0]);
1577 if (!journal_path) {
1578 ext4_msg(sb, KERN_ERR, "error: could not dup "
1579 "journal device string");
1580 return -1;
1581 }
1582
1583 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1584 if (error) {
1585 ext4_msg(sb, KERN_ERR, "error: could not find "
1586 "journal device path: error %d", error);
1587 kfree(journal_path);
1588 return -1;
1589 }
1590
1591 journal_inode = path.dentry->d_inode;
1592 if (!S_ISBLK(journal_inode->i_mode)) {
1593 ext4_msg(sb, KERN_ERR, "error: journal path %s "
1594 "is not a block device", journal_path);
1595 path_put(&path);
1596 kfree(journal_path);
1597 return -1;
1598 }
1599
1600 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1601 path_put(&path);
1602 kfree(journal_path);
Jan Kara5f3633e2013-02-02 23:09:36 -05001603 } else if (token == Opt_journal_ioprio) {
1604 if (arg > 7) {
1605 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
1606 " (must be 0-7)");
1607 return -1;
1608 }
1609 *journal_ioprio =
1610 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
1611 } else if (m->flags & MOPT_DATAJ) {
1612 if (is_remount) {
1613 if (!sbi->s_journal)
1614 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1615 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
1616 ext4_msg(sb, KERN_ERR,
1617 "Cannot change data mode on remount");
1618 return -1;
1619 }
1620 } else {
1621 clear_opt(sb, DATA_FLAGS);
1622 sbi->s_mount_opt |= m->mount_opt;
1623 }
1624#ifdef CONFIG_QUOTA
1625 } else if (m->flags & MOPT_QFMT) {
1626 if (sb_any_quota_loaded(sb) &&
1627 sbi->s_jquota_fmt != m->mount_opt) {
1628 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
1629 "quota options when quota turned on");
1630 return -1;
1631 }
Jan Kara262b4662013-03-02 17:57:08 -05001632 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
1633 EXT4_FEATURE_RO_COMPAT_QUOTA)) {
1634 ext4_msg(sb, KERN_ERR,
1635 "Cannot set journaled quota options "
1636 "when QUOTA feature is enabled");
1637 return -1;
1638 }
Jan Kara5f3633e2013-02-02 23:09:36 -05001639 sbi->s_jquota_fmt = m->mount_opt;
1640#endif
1641 } else {
1642 if (!args->from)
1643 arg = 1;
1644 if (m->flags & MOPT_CLEAR)
1645 arg = !arg;
1646 else if (unlikely(!(m->flags & MOPT_SET))) {
1647 ext4_msg(sb, KERN_WARNING,
1648 "buggy handling of option %s", opt);
1649 WARN_ON(1);
1650 return -1;
1651 }
1652 if (arg != 0)
1653 sbi->s_mount_opt |= m->mount_opt;
1654 else
1655 sbi->s_mount_opt &= ~m->mount_opt;
1656 }
1657 return 1;
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001658}
1659
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001660static int parse_options(char *options, struct super_block *sb,
Theodore Ts'oc3191062009-01-06 11:14:25 -05001661 unsigned long *journal_devnum,
Theodore Ts'ob3881f72009-01-05 22:46:26 -05001662 unsigned int *journal_ioprio,
Eric Sandeen661aa522012-02-20 17:53:04 -05001663 int is_remount)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001664{
Mingming Cao617ba132006-10-11 01:20:53 -07001665 struct ext4_sb_info *sbi = EXT4_SB(sb);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001666 char *p;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001667 substring_t args[MAX_OPT_ARGS];
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001668 int token;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001669
1670 if (!options)
1671 return 1;
1672
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001673 while ((p = strsep(&options, ",")) != NULL) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001674 if (!*p)
1675 continue;
Eric Sandeen15121c12010-02-15 20:17:55 -05001676 /*
1677 * Initialize args struct so we know whether arg was
1678 * found; some options take optional arguments.
1679 */
Sachin Kamatcaecd0a2012-08-18 22:29:18 -04001680 args[0].to = args[0].from = NULL;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001681 token = match_token(p, tokens, args);
Theodore Ts'o26092bf2012-03-03 23:20:47 -05001682 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1683 journal_ioprio, is_remount) < 0)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001684 return 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001685 }
1686#ifdef CONFIG_QUOTA
Jan Kara262b4662013-03-02 17:57:08 -05001687 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
1688 (test_opt(sb, USRQUOTA) || test_opt(sb, GRPQUOTA))) {
1689 ext4_msg(sb, KERN_ERR, "Cannot set quota options when QUOTA "
1690 "feature is enabled");
1691 return 0;
1692 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001693 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
Dmitry Monakhov482a7422010-02-24 11:35:32 -05001694 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05001695 clear_opt(sb, USRQUOTA);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001696
Dmitry Monakhov482a7422010-02-24 11:35:32 -05001697 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05001698 clear_opt(sb, GRPQUOTA);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001699
Dmitry Monakhov56c50f12010-03-01 23:28:41 -05001700 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04001701 ext4_msg(sb, KERN_ERR, "old and new quota "
1702 "format mixing");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001703 return 0;
1704 }
1705
1706 if (!sbi->s_jquota_fmt) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04001707 ext4_msg(sb, KERN_ERR, "journaled quota format "
1708 "not specified");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001709 return 0;
1710 }
1711 } else {
1712 if (sbi->s_jquota_fmt) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04001713 ext4_msg(sb, KERN_ERR, "journaled quota format "
Jan Kara2c8be6b2008-05-13 21:27:55 -04001714 "specified with no journaling "
Eric Sandeenb31e1552009-06-04 17:36:36 -04001715 "enabled");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001716 return 0;
1717 }
1718 }
1719#endif
Jan Kara261cb20c2012-12-20 00:07:18 -05001720 if (test_opt(sb, DIOREAD_NOLOCK)) {
1721 int blocksize =
1722 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
1723
1724 if (blocksize < PAGE_CACHE_SIZE) {
1725 ext4_msg(sb, KERN_ERR, "can't mount with "
1726 "dioread_nolock if block size != PAGE_SIZE");
1727 return 0;
1728 }
1729 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001730 return 1;
1731}
1732
Theodore Ts'o2adf6da2012-03-03 23:20:50 -05001733static inline void ext4_show_quota_options(struct seq_file *seq,
1734 struct super_block *sb)
1735{
1736#if defined(CONFIG_QUOTA)
1737 struct ext4_sb_info *sbi = EXT4_SB(sb);
1738
1739 if (sbi->s_jquota_fmt) {
1740 char *fmtname = "";
1741
1742 switch (sbi->s_jquota_fmt) {
1743 case QFMT_VFS_OLD:
1744 fmtname = "vfsold";
1745 break;
1746 case QFMT_VFS_V0:
1747 fmtname = "vfsv0";
1748 break;
1749 case QFMT_VFS_V1:
1750 fmtname = "vfsv1";
1751 break;
1752 }
1753 seq_printf(seq, ",jqfmt=%s", fmtname);
1754 }
1755
1756 if (sbi->s_qf_names[USRQUOTA])
1757 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
1758
1759 if (sbi->s_qf_names[GRPQUOTA])
1760 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
Theodore Ts'o2adf6da2012-03-03 23:20:50 -05001761#endif
1762}
1763
Theodore Ts'o5a916be2012-03-04 19:27:31 -05001764static const char *token2str(int token)
1765{
Herton Ronaldo Krzesinski50df9fd2012-09-23 22:49:12 -04001766 const struct match_token *t;
Theodore Ts'o5a916be2012-03-04 19:27:31 -05001767
1768 for (t = tokens; t->token != Opt_err; t++)
1769 if (t->token == token && !strchr(t->pattern, '='))
1770 break;
1771 return t->pattern;
1772}
1773
Theodore Ts'o2adf6da2012-03-03 23:20:50 -05001774/*
1775 * Show an option if
1776 * - it's set to a non-default value OR
1777 * - if the per-sb default is different from the global default
1778 */
Theodore Ts'o66acdcf2012-03-04 20:21:38 -05001779static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1780 int nodefs)
Theodore Ts'o2adf6da2012-03-03 23:20:50 -05001781{
Theodore Ts'o2adf6da2012-03-03 23:20:50 -05001782 struct ext4_sb_info *sbi = EXT4_SB(sb);
1783 struct ext4_super_block *es = sbi->s_es;
Theodore Ts'o66acdcf2012-03-04 20:21:38 -05001784 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
Theodore Ts'o5a916be2012-03-04 19:27:31 -05001785 const struct mount_opts *m;
Theodore Ts'o66acdcf2012-03-04 20:21:38 -05001786 char sep = nodefs ? '\n' : ',';
Theodore Ts'o2adf6da2012-03-03 23:20:50 -05001787
Theodore Ts'o66acdcf2012-03-04 20:21:38 -05001788#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1789#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
Theodore Ts'o2adf6da2012-03-03 23:20:50 -05001790
1791 if (sbi->s_sb_block != 1)
Theodore Ts'o5a916be2012-03-04 19:27:31 -05001792 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1793
1794 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1795 int want_set = m->flags & MOPT_SET;
1796 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1797 (m->flags & MOPT_CLEAR_ERR))
1798 continue;
Theodore Ts'o66acdcf2012-03-04 20:21:38 -05001799 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
Theodore Ts'o5a916be2012-03-04 19:27:31 -05001800 continue; /* skip if same as the default */
1801 if ((want_set &&
1802 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1803 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1804 continue; /* select Opt_noFoo vs Opt_Foo */
1805 SEQ_OPTS_PRINT("%s", token2str(m->token));
1806 }
1807
Eric W. Biederman08cefc72012-02-07 15:41:49 -08001808 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
Theodore Ts'o5a916be2012-03-04 19:27:31 -05001809 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
Eric W. Biederman08cefc72012-02-07 15:41:49 -08001810 SEQ_OPTS_PRINT("resuid=%u",
1811 from_kuid_munged(&init_user_ns, sbi->s_resuid));
1812 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
Theodore Ts'o5a916be2012-03-04 19:27:31 -05001813 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
Eric W. Biederman08cefc72012-02-07 15:41:49 -08001814 SEQ_OPTS_PRINT("resgid=%u",
1815 from_kgid_munged(&init_user_ns, sbi->s_resgid));
Theodore Ts'o66acdcf2012-03-04 20:21:38 -05001816 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
Theodore Ts'o5a916be2012-03-04 19:27:31 -05001817 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
1818 SEQ_OPTS_PUTS("errors=remount-ro");
Theodore Ts'o2adf6da2012-03-03 23:20:50 -05001819 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
Theodore Ts'o5a916be2012-03-04 19:27:31 -05001820 SEQ_OPTS_PUTS("errors=continue");
Theodore Ts'o2adf6da2012-03-03 23:20:50 -05001821 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
Theodore Ts'o5a916be2012-03-04 19:27:31 -05001822 SEQ_OPTS_PUTS("errors=panic");
Theodore Ts'o66acdcf2012-03-04 20:21:38 -05001823 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
Theodore Ts'o5a916be2012-03-04 19:27:31 -05001824 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
Theodore Ts'o66acdcf2012-03-04 20:21:38 -05001825 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
Theodore Ts'o5a916be2012-03-04 19:27:31 -05001826 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
Theodore Ts'o66acdcf2012-03-04 20:21:38 -05001827 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
Theodore Ts'o5a916be2012-03-04 19:27:31 -05001828 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
Theodore Ts'o2adf6da2012-03-03 23:20:50 -05001829 if (sb->s_flags & MS_I_VERSION)
Theodore Ts'o5a916be2012-03-04 19:27:31 -05001830 SEQ_OPTS_PUTS("i_version");
Theodore Ts'o66acdcf2012-03-04 20:21:38 -05001831 if (nodefs || sbi->s_stripe)
Theodore Ts'o5a916be2012-03-04 19:27:31 -05001832 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
Theodore Ts'o66acdcf2012-03-04 20:21:38 -05001833 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
Theodore Ts'o5a916be2012-03-04 19:27:31 -05001834 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1835 SEQ_OPTS_PUTS("data=journal");
1836 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1837 SEQ_OPTS_PUTS("data=ordered");
1838 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1839 SEQ_OPTS_PUTS("data=writeback");
1840 }
Theodore Ts'o66acdcf2012-03-04 20:21:38 -05001841 if (nodefs ||
1842 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
Theodore Ts'o5a916be2012-03-04 19:27:31 -05001843 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1844 sbi->s_inode_readahead_blks);
Theodore Ts'o2adf6da2012-03-03 23:20:50 -05001845
Theodore Ts'o66acdcf2012-03-04 20:21:38 -05001846 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
1847 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
Theodore Ts'o5a916be2012-03-04 19:27:31 -05001848 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
Theodore Ts'odf981d02012-08-17 09:48:17 -04001849 if (nodefs || sbi->s_max_dir_size_kb)
1850 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
Theodore Ts'o2adf6da2012-03-03 23:20:50 -05001851
1852 ext4_show_quota_options(seq, sb);
Theodore Ts'o2adf6da2012-03-03 23:20:50 -05001853 return 0;
1854}
1855
Theodore Ts'o66acdcf2012-03-04 20:21:38 -05001856static int ext4_show_options(struct seq_file *seq, struct dentry *root)
1857{
1858 return _ext4_show_options(seq, root->d_sb, 0);
1859}
1860
1861static int options_seq_show(struct seq_file *seq, void *offset)
1862{
1863 struct super_block *sb = seq->private;
1864 int rc;
1865
1866 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
1867 rc = _ext4_show_options(seq, sb, 1);
1868 seq_puts(seq, "\n");
1869 return rc;
1870}
1871
1872static int options_open_fs(struct inode *inode, struct file *file)
1873{
Al Virod9dda782013-03-31 18:16:14 -04001874 return single_open(file, options_seq_show, PDE_DATA(inode));
Theodore Ts'o66acdcf2012-03-04 20:21:38 -05001875}
1876
1877static const struct file_operations ext4_seq_options_fops = {
1878 .owner = THIS_MODULE,
1879 .open = options_open_fs,
1880 .read = seq_read,
1881 .llseek = seq_lseek,
1882 .release = single_release,
1883};
1884
Mingming Cao617ba132006-10-11 01:20:53 -07001885static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001886 int read_only)
1887{
Mingming Cao617ba132006-10-11 01:20:53 -07001888 struct ext4_sb_info *sbi = EXT4_SB(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001889 int res = 0;
1890
Mingming Cao617ba132006-10-11 01:20:53 -07001891 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04001892 ext4_msg(sb, KERN_ERR, "revision level too high, "
1893 "forcing read-only mode");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001894 res = MS_RDONLY;
1895 }
1896 if (read_only)
Theodore Ts'o281b5992011-09-09 18:34:51 -04001897 goto done;
Mingming Cao617ba132006-10-11 01:20:53 -07001898 if (!(sbi->s_mount_state & EXT4_VALID_FS))
Eric Sandeenb31e1552009-06-04 17:36:36 -04001899 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1900 "running e2fsck is recommended");
Mingming Cao617ba132006-10-11 01:20:53 -07001901 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
Eric Sandeenb31e1552009-06-04 17:36:36 -04001902 ext4_msg(sb, KERN_WARNING,
1903 "warning: mounting fs with errors, "
1904 "running e2fsck is recommended");
Tao Maed3ce802011-05-18 13:29:57 -04001905 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001906 le16_to_cpu(es->s_mnt_count) >=
1907 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
Eric Sandeenb31e1552009-06-04 17:36:36 -04001908 ext4_msg(sb, KERN_WARNING,
1909 "warning: maximal mount count reached, "
1910 "running e2fsck is recommended");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001911 else if (le32_to_cpu(es->s_checkinterval) &&
1912 (le32_to_cpu(es->s_lastcheck) +
1913 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
Eric Sandeenb31e1552009-06-04 17:36:36 -04001914 ext4_msg(sb, KERN_WARNING,
1915 "warning: checktime reached, "
1916 "running e2fsck is recommended");
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04001917 if (!sbi->s_journal)
Frank Mayhar03901312009-01-07 00:06:22 -05001918 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001919 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
Mingming Cao617ba132006-10-11 01:20:53 -07001920 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
Marcin Slusarze8546d02008-04-17 10:38:59 -04001921 le16_add_cpu(&es->s_mnt_count, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001922 es->s_mtime = cpu_to_le32(get_seconds());
Mingming Cao617ba132006-10-11 01:20:53 -07001923 ext4_update_dynamic_rev(sb);
Frank Mayhar03901312009-01-07 00:06:22 -05001924 if (sbi->s_journal)
1925 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001926
Theodore Ts'oe2d67052009-05-01 00:33:44 -04001927 ext4_commit_super(sb, 1);
Theodore Ts'o281b5992011-09-09 18:34:51 -04001928done:
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001929 if (test_opt(sb, DEBUG))
Theodore Ts'oa9df9a42009-01-05 22:18:16 -05001930 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
Theodore Ts'oa2595b82010-12-15 20:30:48 -05001931 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001932 sb->s_blocksize,
1933 sbi->s_groups_count,
Mingming Cao617ba132006-10-11 01:20:53 -07001934 EXT4_BLOCKS_PER_GROUP(sb),
1935 EXT4_INODES_PER_GROUP(sb),
Theodore Ts'oa2595b82010-12-15 20:30:48 -05001936 sbi->s_mount_opt, sbi->s_mount_opt2);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001937
Dan Magenheimer7abc52c2011-05-26 10:02:03 -06001938 cleancache_init_fs(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001939 return res;
1940}
1941
Theodore Ts'o117fff12012-09-05 01:29:50 -04001942int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
1943{
1944 struct ext4_sb_info *sbi = EXT4_SB(sb);
1945 struct flex_groups *new_groups;
1946 int size;
1947
1948 if (!sbi->s_log_groups_per_flex)
1949 return 0;
1950
1951 size = ext4_flex_group(sbi, ngroup - 1) + 1;
1952 if (size <= sbi->s_flex_groups_allocated)
1953 return 0;
1954
1955 size = roundup_pow_of_two(size * sizeof(struct flex_groups));
1956 new_groups = ext4_kvzalloc(size, GFP_KERNEL);
1957 if (!new_groups) {
1958 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
1959 size / (int) sizeof(struct flex_groups));
1960 return -ENOMEM;
1961 }
1962
1963 if (sbi->s_flex_groups) {
1964 memcpy(new_groups, sbi->s_flex_groups,
1965 (sbi->s_flex_groups_allocated *
1966 sizeof(struct flex_groups)));
1967 ext4_kvfree(sbi->s_flex_groups);
1968 }
1969 sbi->s_flex_groups = new_groups;
1970 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
1971 return 0;
1972}
1973
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001974static int ext4_fill_flex_info(struct super_block *sb)
1975{
1976 struct ext4_sb_info *sbi = EXT4_SB(sb);
1977 struct ext4_group_desc *gdp = NULL;
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001978 ext4_group_t flex_group;
Theodore Ts'o117fff12012-09-05 01:29:50 -04001979 int i, err;
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001980
Theodore Ts'o503358a2009-11-23 07:24:46 -05001981 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
Xi Wangd50f2ab2012-01-10 11:51:10 -05001982 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001983 sbi->s_log_groups_per_flex = 0;
1984 return 1;
1985 }
1986
Theodore Ts'o117fff12012-09-05 01:29:50 -04001987 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
1988 if (err)
Theodore Ts'o9933fc02011-08-01 08:45:02 -04001989 goto failed;
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001990
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001991 for (i = 0; i < sbi->s_groups_count; i++) {
Theodore Ts'o88b6edd2009-05-25 11:50:39 -04001992 gdp = ext4_get_group_desc(sb, i, NULL);
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001993
1994 flex_group = ext4_flex_group(sbi, i);
Theodore Ts'o7ad9bb62009-09-11 16:51:28 -04001995 atomic_add(ext4_free_inodes_count(sb, gdp),
1996 &sbi->s_flex_groups[flex_group].free_inodes);
Theodore Ts'o90ba9832013-03-11 23:39:59 -04001997 atomic64_add(ext4_free_group_clusters(sb, gdp),
1998 &sbi->s_flex_groups[flex_group].free_clusters);
Theodore Ts'o7ad9bb62009-09-11 16:51:28 -04001999 atomic_add(ext4_used_dirs_count(sb, gdp),
2000 &sbi->s_flex_groups[flex_group].used_dirs);
Jose R. Santos772cb7c2008-07-11 19:27:31 -04002001 }
2002
2003 return 1;
2004failed:
2005 return 0;
2006}
2007
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04002008static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
2009 struct ext4_group_desc *gdp)
Andreas Dilger717d50e2007-10-16 18:38:25 -04002010{
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04002011 int offset;
Andreas Dilger717d50e2007-10-16 18:38:25 -04002012 __u16 crc = 0;
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04002013 __le32 le_group = cpu_to_le32(block_group);
Andreas Dilger717d50e2007-10-16 18:38:25 -04002014
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04002015 if ((sbi->s_es->s_feature_ro_compat &
2016 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))) {
2017 /* Use new metadata_csum algorithm */
Theodore Ts'od6a77102013-04-09 23:59:55 -04002018 __le16 save_csum;
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04002019 __u32 csum32;
Andreas Dilger717d50e2007-10-16 18:38:25 -04002020
Theodore Ts'od6a77102013-04-09 23:59:55 -04002021 save_csum = gdp->bg_checksum;
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04002022 gdp->bg_checksum = 0;
2023 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2024 sizeof(le_group));
2025 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp,
2026 sbi->s_desc_size);
Theodore Ts'od6a77102013-04-09 23:59:55 -04002027 gdp->bg_checksum = save_csum;
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04002028
2029 crc = csum32 & 0xFFFF;
2030 goto out;
Andreas Dilger717d50e2007-10-16 18:38:25 -04002031 }
2032
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04002033 /* old crc16 code */
2034 offset = offsetof(struct ext4_group_desc, bg_checksum);
2035
2036 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2037 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2038 crc = crc16(crc, (__u8 *)gdp, offset);
2039 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2040 /* for checksum of struct ext4_group_desc do the rest...*/
2041 if ((sbi->s_es->s_feature_incompat &
2042 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
2043 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2044 crc = crc16(crc, (__u8 *)gdp + offset,
2045 le16_to_cpu(sbi->s_es->s_desc_size) -
2046 offset);
2047
2048out:
Andreas Dilger717d50e2007-10-16 18:38:25 -04002049 return cpu_to_le16(crc);
2050}
2051
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04002052int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
Andreas Dilger717d50e2007-10-16 18:38:25 -04002053 struct ext4_group_desc *gdp)
2054{
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04002055 if (ext4_has_group_desc_csum(sb) &&
2056 (gdp->bg_checksum != ext4_group_desc_csum(EXT4_SB(sb),
2057 block_group, gdp)))
Andreas Dilger717d50e2007-10-16 18:38:25 -04002058 return 0;
2059
2060 return 1;
2061}
2062
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04002063void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2064 struct ext4_group_desc *gdp)
2065{
2066 if (!ext4_has_group_desc_csum(sb))
2067 return;
2068 gdp->bg_checksum = ext4_group_desc_csum(EXT4_SB(sb), block_group, gdp);
2069}
2070
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002071/* Called at mount-time, super-block is locked */
Lukas Czernerbfff6872010-10-27 21:30:05 -04002072static int ext4_check_descriptors(struct super_block *sb,
2073 ext4_group_t *first_not_zeroed)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002074{
Mingming Cao617ba132006-10-11 01:20:53 -07002075 struct ext4_sb_info *sbi = EXT4_SB(sb);
2076 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2077 ext4_fsblk_t last_block;
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002078 ext4_fsblk_t block_bitmap;
2079 ext4_fsblk_t inode_bitmap;
2080 ext4_fsblk_t inode_table;
Jose R. Santosce421582007-10-16 18:38:25 -04002081 int flexbg_flag = 0;
Lukas Czernerbfff6872010-10-27 21:30:05 -04002082 ext4_group_t i, grp = sbi->s_groups_count;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002083
Jose R. Santosce421582007-10-16 18:38:25 -04002084 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2085 flexbg_flag = 1;
2086
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002087 ext4_debug("Checking group descriptors");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002088
Akinobu Mita197cd65a2008-02-06 01:40:16 -08002089 for (i = 0; i < sbi->s_groups_count; i++) {
2090 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2091
Jose R. Santosce421582007-10-16 18:38:25 -04002092 if (i == sbi->s_groups_count - 1 || flexbg_flag)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002093 last_block = ext4_blocks_count(sbi->s_es) - 1;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002094 else
2095 last_block = first_block +
Mingming Cao617ba132006-10-11 01:20:53 -07002096 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002097
Lukas Czernerbfff6872010-10-27 21:30:05 -04002098 if ((grp == sbi->s_groups_count) &&
2099 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2100 grp = i;
2101
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07002102 block_bitmap = ext4_block_bitmap(sb, gdp);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002103 if (block_bitmap < first_block || block_bitmap > last_block) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04002104 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
Theodore Ts'oa9df9a42009-01-05 22:18:16 -05002105 "Block bitmap for group %u not in group "
Eric Sandeenb31e1552009-06-04 17:36:36 -04002106 "(block %llu)!", i, block_bitmap);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002107 return 0;
2108 }
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07002109 inode_bitmap = ext4_inode_bitmap(sb, gdp);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002110 if (inode_bitmap < first_block || inode_bitmap > last_block) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04002111 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
Theodore Ts'oa9df9a42009-01-05 22:18:16 -05002112 "Inode bitmap for group %u not in group "
Eric Sandeenb31e1552009-06-04 17:36:36 -04002113 "(block %llu)!", i, inode_bitmap);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002114 return 0;
2115 }
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07002116 inode_table = ext4_inode_table(sb, gdp);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002117 if (inode_table < first_block ||
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002118 inode_table + sbi->s_itb_per_group - 1 > last_block) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04002119 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
Theodore Ts'oa9df9a42009-01-05 22:18:16 -05002120 "Inode table for group %u not in group "
Eric Sandeenb31e1552009-06-04 17:36:36 -04002121 "(block %llu)!", i, inode_table);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002122 return 0;
2123 }
Aneesh Kumar K.V955ce5f2009-05-02 20:35:09 -04002124 ext4_lock_group(sb, i);
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04002125 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04002126 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2127 "Checksum for group %u failed (%u!=%u)",
2128 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2129 gdp)), le16_to_cpu(gdp->bg_checksum));
Li Zefan7ee1ec42008-09-08 10:47:19 -04002130 if (!(sb->s_flags & MS_RDONLY)) {
Aneesh Kumar K.V955ce5f2009-05-02 20:35:09 -04002131 ext4_unlock_group(sb, i);
Theodore Ts'o8a266462008-07-26 14:34:21 -04002132 return 0;
Li Zefan7ee1ec42008-09-08 10:47:19 -04002133 }
Andreas Dilger717d50e2007-10-16 18:38:25 -04002134 }
Aneesh Kumar K.V955ce5f2009-05-02 20:35:09 -04002135 ext4_unlock_group(sb, i);
Jose R. Santosce421582007-10-16 18:38:25 -04002136 if (!flexbg_flag)
2137 first_block += EXT4_BLOCKS_PER_GROUP(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002138 }
Lukas Czernerbfff6872010-10-27 21:30:05 -04002139 if (NULL != first_not_zeroed)
2140 *first_not_zeroed = grp;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002141
Theodore Ts'o5dee5432011-09-09 19:10:51 -04002142 ext4_free_blocks_count_set(sbi->s_es,
2143 EXT4_C2B(sbi, ext4_count_free_clusters(sb)));
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04002144 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002145 return 1;
2146}
2147
Mingming Cao617ba132006-10-11 01:20:53 -07002148/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002149 * the superblock) which were deleted from all directories, but held open by
2150 * a process at the time of a crash. We walk the list and try to delete these
2151 * inodes at recovery time (only with a read-write filesystem).
2152 *
2153 * In order to keep the orphan inode chain consistent during traversal (in
2154 * case of crash during recovery), we link each inode into the superblock
2155 * orphan list_head and handle it the same way as an inode deletion during
2156 * normal operation (which journals the operations for us).
2157 *
2158 * We only do an iget() and an iput() on each inode, which is very safe if we
2159 * accidentally point at an in-use or already deleted inode. The worst that
2160 * can happen in this case is that we get a "bit already cleared" message from
Mingming Cao617ba132006-10-11 01:20:53 -07002161 * ext4_free_inode(). The only reason we would point at a wrong inode is if
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002162 * e2fsck was run on this filesystem, and it must have already done the orphan
2163 * inode cleanup for us, so we can safely abort without any further action.
2164 */
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002165static void ext4_orphan_cleanup(struct super_block *sb,
2166 struct ext4_super_block *es)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002167{
2168 unsigned int s_flags = sb->s_flags;
2169 int nr_orphans = 0, nr_truncates = 0;
2170#ifdef CONFIG_QUOTA
2171 int i;
2172#endif
2173 if (!es->s_last_orphan) {
2174 jbd_debug(4, "no orphan inodes to clean up\n");
2175 return;
2176 }
2177
Eric Sandeena8f48a92006-12-06 20:40:13 -08002178 if (bdev_read_only(sb->s_bdev)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04002179 ext4_msg(sb, KERN_ERR, "write access "
2180 "unavailable, skipping orphan cleanup");
Eric Sandeena8f48a92006-12-06 20:40:13 -08002181 return;
2182 }
2183
Amir Goldsteind39195c2011-02-28 00:53:45 -05002184 /* Check if feature set would not allow a r/w mount */
2185 if (!ext4_feature_set_ok(sb, 0)) {
2186 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2187 "unknown ROCOMPAT features");
2188 return;
2189 }
2190
Mingming Cao617ba132006-10-11 01:20:53 -07002191 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
Eric Sandeenc25f9bc2012-09-26 23:30:12 -04002192 /* don't clear list on RO mount w/ errors */
2193 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002194 jbd_debug(1, "Errors on filesystem, "
2195 "clearing orphan list.\n");
Eric Sandeenc25f9bc2012-09-26 23:30:12 -04002196 es->s_last_orphan = 0;
2197 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002198 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2199 return;
2200 }
2201
2202 if (s_flags & MS_RDONLY) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04002203 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002204 sb->s_flags &= ~MS_RDONLY;
2205 }
2206#ifdef CONFIG_QUOTA
2207 /* Needed for iput() to work correctly and not trash data */
2208 sb->s_flags |= MS_ACTIVE;
2209 /* Turn on quotas so that they are updated correctly */
2210 for (i = 0; i < MAXQUOTAS; i++) {
Mingming Cao617ba132006-10-11 01:20:53 -07002211 if (EXT4_SB(sb)->s_qf_names[i]) {
2212 int ret = ext4_quota_on_mount(sb, i);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002213 if (ret < 0)
Eric Sandeenb31e1552009-06-04 17:36:36 -04002214 ext4_msg(sb, KERN_ERR,
2215 "Cannot turn on journaled "
2216 "quota: error %d", ret);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002217 }
2218 }
2219#endif
2220
2221 while (es->s_last_orphan) {
2222 struct inode *inode;
2223
Josef Bacik97bd42b2008-04-29 22:04:56 -04002224 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2225 if (IS_ERR(inode)) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002226 es->s_last_orphan = 0;
2227 break;
2228 }
2229
Mingming Cao617ba132006-10-11 01:20:53 -07002230 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
Christoph Hellwig871a2932010-03-03 09:05:07 -05002231 dquot_initialize(inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002232 if (inode->i_nlink) {
Paul Taysom566370a2013-05-28 07:51:21 -04002233 if (test_opt(sb, DEBUG))
2234 ext4_msg(sb, KERN_DEBUG,
2235 "%s: truncating inode %lu to %lld bytes",
2236 __func__, inode->i_ino, inode->i_size);
Theodore Ts'oe5f8eab82008-09-08 22:25:04 -04002237 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002238 inode->i_ino, inode->i_size);
Theodore Ts'o721e3eb2012-12-27 01:42:48 -05002239 mutex_lock(&inode->i_mutex);
Lukas Czerner55f252c2013-05-27 23:32:35 -04002240 truncate_inode_pages(inode->i_mapping, inode->i_size);
Mingming Cao617ba132006-10-11 01:20:53 -07002241 ext4_truncate(inode);
Theodore Ts'o721e3eb2012-12-27 01:42:48 -05002242 mutex_unlock(&inode->i_mutex);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002243 nr_truncates++;
2244 } else {
Paul Taysom566370a2013-05-28 07:51:21 -04002245 if (test_opt(sb, DEBUG))
2246 ext4_msg(sb, KERN_DEBUG,
2247 "%s: deleting unreferenced inode %lu",
2248 __func__, inode->i_ino);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002249 jbd_debug(2, "deleting unreferenced inode %lu\n",
2250 inode->i_ino);
2251 nr_orphans++;
2252 }
2253 iput(inode); /* The delete magic happens here! */
2254 }
2255
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002256#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002257
2258 if (nr_orphans)
Eric Sandeenb31e1552009-06-04 17:36:36 -04002259 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2260 PLURAL(nr_orphans));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002261 if (nr_truncates)
Eric Sandeenb31e1552009-06-04 17:36:36 -04002262 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2263 PLURAL(nr_truncates));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002264#ifdef CONFIG_QUOTA
2265 /* Turn quotas off */
2266 for (i = 0; i < MAXQUOTAS; i++) {
2267 if (sb_dqopt(sb)->files[i])
Christoph Hellwig287a8092010-05-19 07:16:45 -04002268 dquot_quota_off(sb, i);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002269 }
2270#endif
2271 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2272}
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04002273
Eric Sandeencd2291a2008-01-28 23:58:27 -05002274/*
2275 * Maximal extent format file size.
2276 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2277 * extent format containers, within a sector_t, and within i_blocks
2278 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2279 * so that won't be a limiting factor.
2280 *
Lukas Czernerf17722f2011-06-06 00:05:17 -04002281 * However there is other limiting factor. We do store extents in the form
2282 * of starting block and length, hence the resulting length of the extent
2283 * covering maximum file size must fit into on-disk format containers as
2284 * well. Given that length is always by 1 unit bigger than max unit (because
2285 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2286 *
Eric Sandeencd2291a2008-01-28 23:58:27 -05002287 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2288 */
Theodore Ts'of287a1a2008-10-16 22:50:48 -04002289static loff_t ext4_max_size(int blkbits, int has_huge_files)
Eric Sandeencd2291a2008-01-28 23:58:27 -05002290{
2291 loff_t res;
2292 loff_t upper_limit = MAX_LFS_FILESIZE;
2293
2294 /* small i_blocks in vfs inode? */
Theodore Ts'of287a1a2008-10-16 22:50:48 -04002295 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
Eric Sandeencd2291a2008-01-28 23:58:27 -05002296 /*
Bartlomiej Zolnierkiewicz90c699a2009-06-19 08:08:50 +02002297 * CONFIG_LBDAF is not enabled implies the inode
Eric Sandeencd2291a2008-01-28 23:58:27 -05002298 * i_block represent total blocks in 512 bytes
2299 * 32 == size of vfs inode i_blocks * 8
2300 */
2301 upper_limit = (1LL << 32) - 1;
2302
2303 /* total blocks in file system block size */
2304 upper_limit >>= (blkbits - 9);
2305 upper_limit <<= blkbits;
2306 }
2307
Lukas Czernerf17722f2011-06-06 00:05:17 -04002308 /*
2309 * 32-bit extent-start container, ee_block. We lower the maxbytes
2310 * by one fs block, so ee_len can cover the extent of maximum file
2311 * size
2312 */
2313 res = (1LL << 32) - 1;
Eric Sandeencd2291a2008-01-28 23:58:27 -05002314 res <<= blkbits;
Eric Sandeencd2291a2008-01-28 23:58:27 -05002315
2316 /* Sanity check against vm- & vfs- imposed limits */
2317 if (res > upper_limit)
2318 res = upper_limit;
2319
2320 return res;
2321}
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002322
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002323/*
Eric Sandeencd2291a2008-01-28 23:58:27 -05002324 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05002325 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2326 * We need to be 1 filesystem block less than the 2^48 sector limit.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002327 */
Theodore Ts'of287a1a2008-10-16 22:50:48 -04002328static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002329{
Mingming Cao617ba132006-10-11 01:20:53 -07002330 loff_t res = EXT4_NDIR_BLOCKS;
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05002331 int meta_blocks;
2332 loff_t upper_limit;
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04002333 /* This is calculated to be the largest file size for a dense, block
2334 * mapped file such that the file's total number of 512-byte sectors,
2335 * including data and all indirect blocks, does not exceed (2^48 - 1).
2336 *
2337 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2338 * number of 512-byte sectors of the file.
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05002339 */
2340
Theodore Ts'of287a1a2008-10-16 22:50:48 -04002341 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05002342 /*
Bartlomiej Zolnierkiewicz90c699a2009-06-19 08:08:50 +02002343 * !has_huge_files or CONFIG_LBDAF not enabled implies that
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04002344 * the inode i_block field represents total file blocks in
2345 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05002346 */
2347 upper_limit = (1LL << 32) - 1;
2348
2349 /* total blocks in file system block size */
2350 upper_limit >>= (bits - 9);
2351
2352 } else {
Aneesh Kumar K.V8180a562008-01-28 23:58:27 -05002353 /*
2354 * We use 48 bit ext4_inode i_blocks
2355 * With EXT4_HUGE_FILE_FL set the i_blocks
2356 * represent total number of blocks in
2357 * file system block size
2358 */
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05002359 upper_limit = (1LL << 48) - 1;
2360
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05002361 }
2362
2363 /* indirect blocks */
2364 meta_blocks = 1;
2365 /* double indirect blocks */
2366 meta_blocks += 1 + (1LL << (bits-2));
2367 /* tripple indirect blocks */
2368 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2369
2370 upper_limit -= meta_blocks;
2371 upper_limit <<= bits;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002372
2373 res += 1LL << (bits-2);
2374 res += 1LL << (2*(bits-2));
2375 res += 1LL << (3*(bits-2));
2376 res <<= bits;
2377 if (res > upper_limit)
2378 res = upper_limit;
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05002379
2380 if (res > MAX_LFS_FILESIZE)
2381 res = MAX_LFS_FILESIZE;
2382
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002383 return res;
2384}
2385
Mingming Cao617ba132006-10-11 01:20:53 -07002386static ext4_fsblk_t descriptor_loc(struct super_block *sb,
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04002387 ext4_fsblk_t logical_sb_block, int nr)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002388{
Mingming Cao617ba132006-10-11 01:20:53 -07002389 struct ext4_sb_info *sbi = EXT4_SB(sb);
Avantika Mathurfd2d4292008-01-28 23:58:27 -05002390 ext4_group_t bg, first_meta_bg;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002391 int has_super = 0;
2392
2393 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2394
Mingming Cao617ba132006-10-11 01:20:53 -07002395 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002396 nr < first_meta_bg)
Andrew Morton70bbb3e2006-10-11 01:21:20 -07002397 return logical_sb_block + nr + 1;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002398 bg = sbi->s_desc_per_block * nr;
Mingming Cao617ba132006-10-11 01:20:53 -07002399 if (ext4_bg_has_super(sb, bg))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002400 has_super = 1;
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04002401
Mingming Cao617ba132006-10-11 01:20:53 -07002402 return (has_super + ext4_group_first_block_no(sb, bg));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002403}
2404
Alex Tomasc9de5602008-01-29 00:19:52 -05002405/**
2406 * ext4_get_stripe_size: Get the stripe size.
2407 * @sbi: In memory super block info
2408 *
2409 * If we have specified it via mount option, then
2410 * use the mount option value. If the value specified at mount time is
2411 * greater than the blocks per group use the super block value.
2412 * If the super block value is greater than blocks per group return 0.
2413 * Allocator needs it be less than blocks per group.
2414 *
2415 */
2416static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2417{
2418 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2419 unsigned long stripe_width =
2420 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
Dan Ehrenberg3eb08652011-07-17 21:18:51 -04002421 int ret;
Alex Tomasc9de5602008-01-29 00:19:52 -05002422
2423 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
Dan Ehrenberg3eb08652011-07-17 21:18:51 -04002424 ret = sbi->s_stripe;
2425 else if (stripe_width <= sbi->s_blocks_per_group)
2426 ret = stripe_width;
2427 else if (stride <= sbi->s_blocks_per_group)
2428 ret = stride;
2429 else
2430 ret = 0;
Alex Tomasc9de5602008-01-29 00:19:52 -05002431
Dan Ehrenberg3eb08652011-07-17 21:18:51 -04002432 /*
2433 * If the stripe width is 1, this makes no sense and
2434 * we set it to 0 to turn off stripe handling code.
2435 */
2436 if (ret <= 1)
2437 ret = 0;
Alex Tomasc9de5602008-01-29 00:19:52 -05002438
Dan Ehrenberg3eb08652011-07-17 21:18:51 -04002439 return ret;
Alex Tomasc9de5602008-01-29 00:19:52 -05002440}
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002441
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002442/* sysfs supprt */
2443
2444struct ext4_attr {
2445 struct attribute attr;
2446 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
Theodore Ts'o60e66792010-05-17 07:00:00 -04002447 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002448 const char *, size_t);
Jan Karaf2d50a62013-06-04 12:51:16 -04002449 union {
2450 int offset;
2451 int deprecated_val;
2452 } u;
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002453};
2454
Lukas Czerner27dd4382013-04-09 22:11:22 -04002455static int parse_strtoull(const char *buf,
2456 unsigned long long max, unsigned long long *value)
2457{
2458 int ret;
2459
2460 ret = kstrtoull(skip_spaces(buf), 0, value);
2461 if (!ret && *value > max)
2462 ret = -EINVAL;
2463 return ret;
2464}
2465
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002466static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2467 struct ext4_sb_info *sbi,
2468 char *buf)
2469{
2470 return snprintf(buf, PAGE_SIZE, "%llu\n",
Aditya Kali7b415bf2011-09-09 19:04:51 -04002471 (s64) EXT4_C2B(sbi,
2472 percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002473}
2474
2475static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2476 struct ext4_sb_info *sbi, char *buf)
2477{
2478 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2479
Theodore Ts'of613dfc2010-07-27 11:56:08 -04002480 if (!sb->s_bdev->bd_part)
2481 return snprintf(buf, PAGE_SIZE, "0\n");
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002482 return snprintf(buf, PAGE_SIZE, "%lu\n",
2483 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2484 sbi->s_sectors_written_start) >> 1);
2485}
2486
2487static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2488 struct ext4_sb_info *sbi, char *buf)
2489{
2490 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2491
Theodore Ts'of613dfc2010-07-27 11:56:08 -04002492 if (!sb->s_bdev->bd_part)
2493 return snprintf(buf, PAGE_SIZE, "0\n");
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002494 return snprintf(buf, PAGE_SIZE, "%llu\n",
Andrew Mortona6b43e32009-12-23 07:48:08 -05002495 (unsigned long long)(sbi->s_kbytes_written +
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002496 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
Andrew Mortona6b43e32009-12-23 07:48:08 -05002497 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002498}
2499
2500static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2501 struct ext4_sb_info *sbi,
2502 const char *buf, size_t count)
2503{
2504 unsigned long t;
Lukas Czernere1091b12013-04-11 23:37:19 -04002505 int ret;
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002506
Lukas Czernere1091b12013-04-11 23:37:19 -04002507 ret = kstrtoul(skip_spaces(buf), 0, &t);
2508 if (ret)
2509 return ret;
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002510
Lukas Czernere1091b12013-04-11 23:37:19 -04002511 if (t && (!is_power_of_2(t) || t > 0x40000000))
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002512 return -EINVAL;
2513
2514 sbi->s_inode_readahead_blks = t;
2515 return count;
2516}
2517
2518static ssize_t sbi_ui_show(struct ext4_attr *a,
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04002519 struct ext4_sb_info *sbi, char *buf)
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002520{
Jan Karaf2d50a62013-06-04 12:51:16 -04002521 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset);
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002522
2523 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2524}
2525
2526static ssize_t sbi_ui_store(struct ext4_attr *a,
2527 struct ext4_sb_info *sbi,
2528 const char *buf, size_t count)
2529{
Jan Karaf2d50a62013-06-04 12:51:16 -04002530 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset);
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002531 unsigned long t;
Lukas Czernere1091b12013-04-11 23:37:19 -04002532 int ret;
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002533
Lukas Czernere1091b12013-04-11 23:37:19 -04002534 ret = kstrtoul(skip_spaces(buf), 0, &t);
2535 if (ret)
2536 return ret;
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002537 *ui = t;
2538 return count;
2539}
2540
Lukas Czerner27dd4382013-04-09 22:11:22 -04002541static ssize_t reserved_clusters_show(struct ext4_attr *a,
2542 struct ext4_sb_info *sbi, char *buf)
2543{
2544 return snprintf(buf, PAGE_SIZE, "%llu\n",
2545 (unsigned long long) atomic64_read(&sbi->s_resv_clusters));
2546}
2547
2548static ssize_t reserved_clusters_store(struct ext4_attr *a,
2549 struct ext4_sb_info *sbi,
2550 const char *buf, size_t count)
2551{
2552 unsigned long long val;
2553 int ret;
2554
2555 if (parse_strtoull(buf, -1ULL, &val))
2556 return -EINVAL;
2557 ret = ext4_reserve_clusters(sbi, val);
2558
2559 return ret ? ret : count;
2560}
2561
Theodore Ts'o2c0544b2012-05-30 22:56:46 -04002562static ssize_t trigger_test_error(struct ext4_attr *a,
2563 struct ext4_sb_info *sbi,
2564 const char *buf, size_t count)
2565{
2566 int len = count;
2567
2568 if (!capable(CAP_SYS_ADMIN))
2569 return -EPERM;
2570
2571 if (len && buf[len-1] == '\n')
2572 len--;
2573
2574 if (len)
2575 ext4_error(sbi->s_sb, "%.*s", len, buf);
2576 return count;
2577}
2578
Jan Karaf2d50a62013-06-04 12:51:16 -04002579static ssize_t sbi_deprecated_show(struct ext4_attr *a,
2580 struct ext4_sb_info *sbi, char *buf)
2581{
2582 return snprintf(buf, PAGE_SIZE, "%d\n", a->u.deprecated_val);
2583}
2584
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002585#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2586static struct ext4_attr ext4_attr_##_name = { \
2587 .attr = {.name = __stringify(_name), .mode = _mode }, \
2588 .show = _show, \
2589 .store = _store, \
Jan Karaf2d50a62013-06-04 12:51:16 -04002590 .u = { \
2591 .offset = offsetof(struct ext4_sb_info, _elname),\
2592 }, \
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002593}
2594#define EXT4_ATTR(name, mode, show, store) \
2595static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2596
Lukas Czerner857ac882010-10-27 21:30:05 -04002597#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002598#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2599#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2600#define EXT4_RW_ATTR_SBI_UI(name, elname) \
2601 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2602#define ATTR_LIST(name) &ext4_attr_##name.attr
Jan Karaf2d50a62013-06-04 12:51:16 -04002603#define EXT4_DEPRECATED_ATTR(_name, _val) \
2604static struct ext4_attr ext4_attr_##_name = { \
2605 .attr = {.name = __stringify(_name), .mode = 0444 }, \
2606 .show = sbi_deprecated_show, \
2607 .u = { \
2608 .deprecated_val = _val, \
2609 }, \
2610}
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002611
2612EXT4_RO_ATTR(delayed_allocation_blocks);
2613EXT4_RO_ATTR(session_write_kbytes);
2614EXT4_RO_ATTR(lifetime_write_kbytes);
Lukas Czerner27dd4382013-04-09 22:11:22 -04002615EXT4_RW_ATTR(reserved_clusters);
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002616EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2617 inode_readahead_blks_store, s_inode_readahead_blks);
Andreas Dilger11013912009-06-13 11:45:35 -04002618EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002619EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2620EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2621EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2622EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2623EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2624EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
Jan Karaf2d50a62013-06-04 12:51:16 -04002625EXT4_DEPRECATED_ATTR(max_writeback_mb_bump, 128);
Zheng Liu67a5da52012-08-17 09:54:17 -04002626EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
Theodore Ts'o2c0544b2012-05-30 22:56:46 -04002627EXT4_ATTR(trigger_fs_error, 0200, NULL, trigger_test_error);
Theodore Ts'oefbed4d2013-10-17 21:11:01 -04002628EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval);
2629EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst, s_err_ratelimit_state.burst);
2630EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval);
2631EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst);
2632EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval);
2633EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst);
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002634
2635static struct attribute *ext4_attrs[] = {
2636 ATTR_LIST(delayed_allocation_blocks),
2637 ATTR_LIST(session_write_kbytes),
2638 ATTR_LIST(lifetime_write_kbytes),
Lukas Czerner27dd4382013-04-09 22:11:22 -04002639 ATTR_LIST(reserved_clusters),
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002640 ATTR_LIST(inode_readahead_blks),
Andreas Dilger11013912009-06-13 11:45:35 -04002641 ATTR_LIST(inode_goal),
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002642 ATTR_LIST(mb_stats),
2643 ATTR_LIST(mb_max_to_scan),
2644 ATTR_LIST(mb_min_to_scan),
2645 ATTR_LIST(mb_order2_req),
2646 ATTR_LIST(mb_stream_req),
2647 ATTR_LIST(mb_group_prealloc),
Theodore Ts'o55138e02009-09-29 13:31:31 -04002648 ATTR_LIST(max_writeback_mb_bump),
Zheng Liu67a5da52012-08-17 09:54:17 -04002649 ATTR_LIST(extent_max_zeroout_kb),
Theodore Ts'o2c0544b2012-05-30 22:56:46 -04002650 ATTR_LIST(trigger_fs_error),
Theodore Ts'oefbed4d2013-10-17 21:11:01 -04002651 ATTR_LIST(err_ratelimit_interval_ms),
2652 ATTR_LIST(err_ratelimit_burst),
2653 ATTR_LIST(warning_ratelimit_interval_ms),
2654 ATTR_LIST(warning_ratelimit_burst),
2655 ATTR_LIST(msg_ratelimit_interval_ms),
2656 ATTR_LIST(msg_ratelimit_burst),
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002657 NULL,
2658};
2659
Lukas Czerner857ac882010-10-27 21:30:05 -04002660/* Features this copy of ext4 supports */
2661EXT4_INFO_ATTR(lazy_itable_init);
Lukas Czerner27ee40d2010-10-27 21:30:12 -04002662EXT4_INFO_ATTR(batched_discard);
Theodore Ts'o5e7bbef2012-09-13 12:11:40 -04002663EXT4_INFO_ATTR(meta_bg_resize);
Lukas Czerner857ac882010-10-27 21:30:05 -04002664
2665static struct attribute *ext4_feat_attrs[] = {
2666 ATTR_LIST(lazy_itable_init),
Lukas Czerner27ee40d2010-10-27 21:30:12 -04002667 ATTR_LIST(batched_discard),
Theodore Ts'o5e7bbef2012-09-13 12:11:40 -04002668 ATTR_LIST(meta_bg_resize),
Lukas Czerner857ac882010-10-27 21:30:05 -04002669 NULL,
2670};
2671
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002672static ssize_t ext4_attr_show(struct kobject *kobj,
2673 struct attribute *attr, char *buf)
2674{
2675 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2676 s_kobj);
2677 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2678
2679 return a->show ? a->show(a, sbi, buf) : 0;
2680}
2681
2682static ssize_t ext4_attr_store(struct kobject *kobj,
2683 struct attribute *attr,
2684 const char *buf, size_t len)
2685{
2686 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2687 s_kobj);
2688 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2689
2690 return a->store ? a->store(a, sbi, buf, len) : 0;
2691}
2692
2693static void ext4_sb_release(struct kobject *kobj)
2694{
2695 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2696 s_kobj);
2697 complete(&sbi->s_kobj_unregister);
2698}
2699
Emese Revfy52cf25d2010-01-19 02:58:23 +01002700static const struct sysfs_ops ext4_attr_ops = {
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002701 .show = ext4_attr_show,
2702 .store = ext4_attr_store,
2703};
2704
2705static struct kobj_type ext4_ktype = {
2706 .default_attrs = ext4_attrs,
2707 .sysfs_ops = &ext4_attr_ops,
2708 .release = ext4_sb_release,
2709};
2710
Lukas Czerner857ac882010-10-27 21:30:05 -04002711static void ext4_feat_release(struct kobject *kobj)
2712{
2713 complete(&ext4_feat->f_kobj_unregister);
2714}
2715
2716static struct kobj_type ext4_feat_ktype = {
2717 .default_attrs = ext4_feat_attrs,
2718 .sysfs_ops = &ext4_attr_ops,
2719 .release = ext4_feat_release,
2720};
2721
Eric Sandeena13fb1a2009-08-18 00:20:23 -04002722/*
2723 * Check whether this filesystem can be mounted based on
2724 * the features present and the RDONLY/RDWR mount requested.
2725 * Returns 1 if this filesystem can be mounted as requested,
2726 * 0 if it cannot be.
2727 */
2728static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2729{
2730 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2731 ext4_msg(sb, KERN_ERR,
2732 "Couldn't mount because of "
2733 "unsupported optional features (%x)",
2734 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2735 ~EXT4_FEATURE_INCOMPAT_SUPP));
2736 return 0;
2737 }
2738
2739 if (readonly)
2740 return 1;
2741
2742 /* Check that feature set is OK for a read-write mount */
2743 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2744 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2745 "unsupported optional features (%x)",
2746 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2747 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2748 return 0;
2749 }
2750 /*
2751 * Large file size enabled file system can only be mounted
2752 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2753 */
2754 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2755 if (sizeof(blkcnt_t) < sizeof(u64)) {
2756 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2757 "cannot be mounted RDWR without "
2758 "CONFIG_LBDAF");
2759 return 0;
2760 }
2761 }
Theodore Ts'obab08ab2011-09-09 18:36:51 -04002762 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
2763 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
2764 ext4_msg(sb, KERN_ERR,
2765 "Can't support bigalloc feature without "
2766 "extents feature\n");
2767 return 0;
2768 }
Aditya Kali7c319d32012-07-22 20:21:31 -04002769
2770#ifndef CONFIG_QUOTA
2771 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
2772 !readonly) {
2773 ext4_msg(sb, KERN_ERR,
2774 "Filesystem with quota feature cannot be mounted RDWR "
2775 "without CONFIG_QUOTA");
2776 return 0;
2777 }
2778#endif /* CONFIG_QUOTA */
Eric Sandeena13fb1a2009-08-18 00:20:23 -04002779 return 1;
2780}
2781
Theodore Ts'o66e61a92010-07-27 11:56:04 -04002782/*
2783 * This function is called once a day if we have errors logged
2784 * on the file system
2785 */
2786static void print_daily_error_info(unsigned long arg)
2787{
2788 struct super_block *sb = (struct super_block *) arg;
2789 struct ext4_sb_info *sbi;
2790 struct ext4_super_block *es;
2791
2792 sbi = EXT4_SB(sb);
2793 es = sbi->s_es;
2794
2795 if (es->s_error_count)
2796 ext4_msg(sb, KERN_NOTICE, "error count: %u",
2797 le32_to_cpu(es->s_error_count));
2798 if (es->s_first_error_time) {
2799 printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
2800 sb->s_id, le32_to_cpu(es->s_first_error_time),
2801 (int) sizeof(es->s_first_error_func),
2802 es->s_first_error_func,
2803 le32_to_cpu(es->s_first_error_line));
2804 if (es->s_first_error_ino)
2805 printk(": inode %u",
2806 le32_to_cpu(es->s_first_error_ino));
2807 if (es->s_first_error_block)
2808 printk(": block %llu", (unsigned long long)
2809 le64_to_cpu(es->s_first_error_block));
2810 printk("\n");
2811 }
2812 if (es->s_last_error_time) {
2813 printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
2814 sb->s_id, le32_to_cpu(es->s_last_error_time),
2815 (int) sizeof(es->s_last_error_func),
2816 es->s_last_error_func,
2817 le32_to_cpu(es->s_last_error_line));
2818 if (es->s_last_error_ino)
2819 printk(": inode %u",
2820 le32_to_cpu(es->s_last_error_ino));
2821 if (es->s_last_error_block)
2822 printk(": block %llu", (unsigned long long)
2823 le64_to_cpu(es->s_last_error_block));
2824 printk("\n");
2825 }
2826 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2827}
2828
Lukas Czernerbfff6872010-10-27 21:30:05 -04002829/* Find next suitable group and run ext4_init_inode_table */
2830static int ext4_run_li_request(struct ext4_li_request *elr)
2831{
2832 struct ext4_group_desc *gdp = NULL;
2833 ext4_group_t group, ngroups;
2834 struct super_block *sb;
2835 unsigned long timeout = 0;
2836 int ret = 0;
2837
2838 sb = elr->lr_super;
2839 ngroups = EXT4_SB(sb)->s_groups_count;
2840
Jan Kara8e8ad8a2012-06-12 16:20:38 +02002841 sb_start_write(sb);
Lukas Czernerbfff6872010-10-27 21:30:05 -04002842 for (group = elr->lr_next_group; group < ngroups; group++) {
2843 gdp = ext4_get_group_desc(sb, group, NULL);
2844 if (!gdp) {
2845 ret = 1;
2846 break;
2847 }
2848
2849 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2850 break;
2851 }
2852
Theodore Ts'o7f511862013-01-13 08:41:45 -05002853 if (group >= ngroups)
Lukas Czernerbfff6872010-10-27 21:30:05 -04002854 ret = 1;
2855
2856 if (!ret) {
2857 timeout = jiffies;
2858 ret = ext4_init_inode_table(sb, group,
2859 elr->lr_timeout ? 0 : 1);
2860 if (elr->lr_timeout == 0) {
Lukas Czerner51ce6512011-05-20 13:55:16 -04002861 timeout = (jiffies - timeout) *
2862 elr->lr_sbi->s_li_wait_mult;
Lukas Czernerbfff6872010-10-27 21:30:05 -04002863 elr->lr_timeout = timeout;
2864 }
2865 elr->lr_next_sched = jiffies + elr->lr_timeout;
2866 elr->lr_next_group = group + 1;
2867 }
Jan Kara8e8ad8a2012-06-12 16:20:38 +02002868 sb_end_write(sb);
Lukas Czernerbfff6872010-10-27 21:30:05 -04002869
2870 return ret;
2871}
2872
2873/*
2874 * Remove lr_request from the list_request and free the
Lukas Czerner4ed5c032011-05-20 13:49:04 -04002875 * request structure. Should be called with li_list_mtx held
Lukas Czernerbfff6872010-10-27 21:30:05 -04002876 */
2877static void ext4_remove_li_request(struct ext4_li_request *elr)
2878{
2879 struct ext4_sb_info *sbi;
2880
2881 if (!elr)
2882 return;
2883
2884 sbi = elr->lr_sbi;
2885
2886 list_del(&elr->lr_request);
2887 sbi->s_li_request = NULL;
2888 kfree(elr);
2889}
2890
2891static void ext4_unregister_li_request(struct super_block *sb)
2892{
Lukas Czerner1bb933f2011-05-20 13:55:29 -04002893 mutex_lock(&ext4_li_mtx);
2894 if (!ext4_li_info) {
2895 mutex_unlock(&ext4_li_mtx);
Lukas Czernerbfff6872010-10-27 21:30:05 -04002896 return;
Lukas Czerner1bb933f2011-05-20 13:55:29 -04002897 }
Lukas Czernerbfff6872010-10-27 21:30:05 -04002898
2899 mutex_lock(&ext4_li_info->li_list_mtx);
Lukas Czerner1bb933f2011-05-20 13:55:29 -04002900 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
Lukas Czernerbfff6872010-10-27 21:30:05 -04002901 mutex_unlock(&ext4_li_info->li_list_mtx);
Lukas Czerner1bb933f2011-05-20 13:55:29 -04002902 mutex_unlock(&ext4_li_mtx);
Lukas Czernerbfff6872010-10-27 21:30:05 -04002903}
2904
Eric Sandeen8f1f7452011-02-03 14:33:15 -05002905static struct task_struct *ext4_lazyinit_task;
2906
Lukas Czernerbfff6872010-10-27 21:30:05 -04002907/*
2908 * This is the function where ext4lazyinit thread lives. It walks
2909 * through the request list searching for next scheduled filesystem.
2910 * When such a fs is found, run the lazy initialization request
2911 * (ext4_rn_li_request) and keep track of the time spend in this
2912 * function. Based on that time we compute next schedule time of
2913 * the request. When walking through the list is complete, compute
2914 * next waking time and put itself into sleep.
2915 */
2916static int ext4_lazyinit_thread(void *arg)
2917{
2918 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2919 struct list_head *pos, *n;
2920 struct ext4_li_request *elr;
Lukas Czerner4ed5c032011-05-20 13:49:04 -04002921 unsigned long next_wakeup, cur;
Lukas Czernerbfff6872010-10-27 21:30:05 -04002922
2923 BUG_ON(NULL == eli);
2924
Lukas Czernerbfff6872010-10-27 21:30:05 -04002925cont_thread:
2926 while (true) {
2927 next_wakeup = MAX_JIFFY_OFFSET;
2928
2929 mutex_lock(&eli->li_list_mtx);
2930 if (list_empty(&eli->li_request_list)) {
2931 mutex_unlock(&eli->li_list_mtx);
2932 goto exit_thread;
2933 }
2934
2935 list_for_each_safe(pos, n, &eli->li_request_list) {
2936 elr = list_entry(pos, struct ext4_li_request,
2937 lr_request);
2938
Theodore Ts'ob2c78cd2010-11-02 14:19:30 -04002939 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2940 if (ext4_run_li_request(elr) != 0) {
2941 /* error, remove the lazy_init job */
2942 ext4_remove_li_request(elr);
2943 continue;
2944 }
Lukas Czernerbfff6872010-10-27 21:30:05 -04002945 }
2946
2947 if (time_before(elr->lr_next_sched, next_wakeup))
2948 next_wakeup = elr->lr_next_sched;
2949 }
2950 mutex_unlock(&eli->li_list_mtx);
2951
Tejun Heoa0acae02011-11-21 12:32:22 -08002952 try_to_freeze();
Lukas Czernerbfff6872010-10-27 21:30:05 -04002953
Lukas Czerner4ed5c032011-05-20 13:49:04 -04002954 cur = jiffies;
2955 if ((time_after_eq(cur, next_wakeup)) ||
Lukas Czernerf4245bd2010-11-02 14:07:17 -04002956 (MAX_JIFFY_OFFSET == next_wakeup)) {
Lukas Czernerbfff6872010-10-27 21:30:05 -04002957 cond_resched();
2958 continue;
2959 }
2960
Lukas Czerner4ed5c032011-05-20 13:49:04 -04002961 schedule_timeout_interruptible(next_wakeup - cur);
2962
Eric Sandeen8f1f7452011-02-03 14:33:15 -05002963 if (kthread_should_stop()) {
2964 ext4_clear_request_list();
2965 goto exit_thread;
2966 }
Lukas Czernerbfff6872010-10-27 21:30:05 -04002967 }
2968
2969exit_thread:
2970 /*
2971 * It looks like the request list is empty, but we need
2972 * to check it under the li_list_mtx lock, to prevent any
2973 * additions into it, and of course we should lock ext4_li_mtx
2974 * to atomically free the list and ext4_li_info, because at
2975 * this point another ext4 filesystem could be registering
2976 * new one.
2977 */
2978 mutex_lock(&ext4_li_mtx);
2979 mutex_lock(&eli->li_list_mtx);
2980 if (!list_empty(&eli->li_request_list)) {
2981 mutex_unlock(&eli->li_list_mtx);
2982 mutex_unlock(&ext4_li_mtx);
2983 goto cont_thread;
2984 }
2985 mutex_unlock(&eli->li_list_mtx);
Lukas Czernerbfff6872010-10-27 21:30:05 -04002986 kfree(ext4_li_info);
2987 ext4_li_info = NULL;
2988 mutex_unlock(&ext4_li_mtx);
2989
2990 return 0;
2991}
2992
2993static void ext4_clear_request_list(void)
2994{
2995 struct list_head *pos, *n;
2996 struct ext4_li_request *elr;
2997
2998 mutex_lock(&ext4_li_info->li_list_mtx);
Lukas Czernerbfff6872010-10-27 21:30:05 -04002999 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
3000 elr = list_entry(pos, struct ext4_li_request,
3001 lr_request);
3002 ext4_remove_li_request(elr);
3003 }
3004 mutex_unlock(&ext4_li_info->li_list_mtx);
3005}
3006
3007static int ext4_run_lazyinit_thread(void)
3008{
Eric Sandeen8f1f7452011-02-03 14:33:15 -05003009 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
3010 ext4_li_info, "ext4lazyinit");
3011 if (IS_ERR(ext4_lazyinit_task)) {
3012 int err = PTR_ERR(ext4_lazyinit_task);
Lukas Czernerbfff6872010-10-27 21:30:05 -04003013 ext4_clear_request_list();
Lukas Czernerbfff6872010-10-27 21:30:05 -04003014 kfree(ext4_li_info);
3015 ext4_li_info = NULL;
Theodore Ts'o92b97812012-03-19 23:41:49 -04003016 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
Lukas Czernerbfff6872010-10-27 21:30:05 -04003017 "initialization thread\n",
3018 err);
3019 return err;
3020 }
3021 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
Lukas Czernerbfff6872010-10-27 21:30:05 -04003022 return 0;
3023}
3024
3025/*
3026 * Check whether it make sense to run itable init. thread or not.
3027 * If there is at least one uninitialized inode table, return
3028 * corresponding group number, else the loop goes through all
3029 * groups and return total number of groups.
3030 */
3031static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
3032{
3033 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
3034 struct ext4_group_desc *gdp = NULL;
3035
3036 for (group = 0; group < ngroups; group++) {
3037 gdp = ext4_get_group_desc(sb, group, NULL);
3038 if (!gdp)
3039 continue;
3040
3041 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3042 break;
3043 }
3044
3045 return group;
3046}
3047
3048static int ext4_li_info_new(void)
3049{
3050 struct ext4_lazy_init *eli = NULL;
3051
3052 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
3053 if (!eli)
3054 return -ENOMEM;
3055
Lukas Czernerbfff6872010-10-27 21:30:05 -04003056 INIT_LIST_HEAD(&eli->li_request_list);
3057 mutex_init(&eli->li_list_mtx);
3058
Lukas Czernerbfff6872010-10-27 21:30:05 -04003059 eli->li_state |= EXT4_LAZYINIT_QUIT;
3060
3061 ext4_li_info = eli;
3062
3063 return 0;
3064}
3065
3066static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3067 ext4_group_t start)
3068{
3069 struct ext4_sb_info *sbi = EXT4_SB(sb);
3070 struct ext4_li_request *elr;
Lukas Czernerbfff6872010-10-27 21:30:05 -04003071
3072 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3073 if (!elr)
3074 return NULL;
3075
3076 elr->lr_super = sb;
3077 elr->lr_sbi = sbi;
3078 elr->lr_next_group = start;
3079
3080 /*
3081 * Randomize first schedule time of the request to
3082 * spread the inode table initialization requests
3083 * better.
3084 */
Theodore Ts'odd1f7232013-11-08 00:14:53 -05003085 elr->lr_next_sched = jiffies + (prandom_u32() %
3086 (EXT4_DEF_LI_MAX_START_DELAY * HZ));
Lukas Czernerbfff6872010-10-27 21:30:05 -04003087 return elr;
3088}
3089
Theodore Ts'o7f511862013-01-13 08:41:45 -05003090int ext4_register_li_request(struct super_block *sb,
3091 ext4_group_t first_not_zeroed)
Lukas Czernerbfff6872010-10-27 21:30:05 -04003092{
3093 struct ext4_sb_info *sbi = EXT4_SB(sb);
Theodore Ts'o7f511862013-01-13 08:41:45 -05003094 struct ext4_li_request *elr = NULL;
Lukas Czernerbfff6872010-10-27 21:30:05 -04003095 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
Andrew Morton6c5a6cb2011-01-10 12:30:17 -05003096 int ret = 0;
Lukas Czernerbfff6872010-10-27 21:30:05 -04003097
Theodore Ts'o7f511862013-01-13 08:41:45 -05003098 mutex_lock(&ext4_li_mtx);
Lukas Czerner51ce6512011-05-20 13:55:16 -04003099 if (sbi->s_li_request != NULL) {
3100 /*
3101 * Reset timeout so it can be computed again, because
3102 * s_li_wait_mult might have changed.
3103 */
3104 sbi->s_li_request->lr_timeout = 0;
Theodore Ts'o7f511862013-01-13 08:41:45 -05003105 goto out;
Lukas Czerner51ce6512011-05-20 13:55:16 -04003106 }
Lukas Czernerbfff6872010-10-27 21:30:05 -04003107
3108 if (first_not_zeroed == ngroups ||
3109 (sb->s_flags & MS_RDONLY) ||
Tao Ma55ff3842011-05-09 10:28:41 -04003110 !test_opt(sb, INIT_INODE_TABLE))
Theodore Ts'o7f511862013-01-13 08:41:45 -05003111 goto out;
Lukas Czernerbfff6872010-10-27 21:30:05 -04003112
3113 elr = ext4_li_request_new(sb, first_not_zeroed);
Theodore Ts'o7f511862013-01-13 08:41:45 -05003114 if (!elr) {
3115 ret = -ENOMEM;
3116 goto out;
3117 }
Lukas Czernerbfff6872010-10-27 21:30:05 -04003118
3119 if (NULL == ext4_li_info) {
3120 ret = ext4_li_info_new();
3121 if (ret)
3122 goto out;
3123 }
3124
3125 mutex_lock(&ext4_li_info->li_list_mtx);
3126 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3127 mutex_unlock(&ext4_li_info->li_list_mtx);
3128
3129 sbi->s_li_request = elr;
Tao Ma46e46902011-04-04 16:00:49 -04003130 /*
3131 * set elr to NULL here since it has been inserted to
3132 * the request_list and the removal and free of it is
3133 * handled by ext4_clear_request_list from now on.
3134 */
3135 elr = NULL;
Lukas Czernerbfff6872010-10-27 21:30:05 -04003136
3137 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3138 ret = ext4_run_lazyinit_thread();
3139 if (ret)
3140 goto out;
3141 }
Lukas Czernerbfff6872010-10-27 21:30:05 -04003142out:
Nicolas Kaiserbeed5ecb2010-10-27 22:08:42 -04003143 mutex_unlock(&ext4_li_mtx);
3144 if (ret)
Lukas Czernerbfff6872010-10-27 21:30:05 -04003145 kfree(elr);
Lukas Czernerbfff6872010-10-27 21:30:05 -04003146 return ret;
3147}
3148
3149/*
3150 * We do not need to lock anything since this is called on
3151 * module unload.
3152 */
3153static void ext4_destroy_lazyinit_thread(void)
3154{
3155 /*
3156 * If thread exited earlier
3157 * there's nothing to be done.
3158 */
Eric Sandeen8f1f7452011-02-03 14:33:15 -05003159 if (!ext4_li_info || !ext4_lazyinit_task)
Lukas Czernerbfff6872010-10-27 21:30:05 -04003160 return;
3161
Eric Sandeen8f1f7452011-02-03 14:33:15 -05003162 kthread_stop(ext4_lazyinit_task);
Lukas Czernerbfff6872010-10-27 21:30:05 -04003163}
3164
Darrick J. Wong25ed6e82012-05-27 07:48:56 -04003165static int set_journal_csum_feature_set(struct super_block *sb)
3166{
3167 int ret = 1;
3168 int compat, incompat;
3169 struct ext4_sb_info *sbi = EXT4_SB(sb);
3170
3171 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3172 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3173 /* journal checksum v2 */
3174 compat = 0;
3175 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V2;
3176 } else {
3177 /* journal checksum v1 */
3178 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3179 incompat = 0;
3180 }
3181
3182 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3183 ret = jbd2_journal_set_features(sbi->s_journal,
3184 compat, 0,
3185 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3186 incompat);
3187 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3188 ret = jbd2_journal_set_features(sbi->s_journal,
3189 compat, 0,
3190 incompat);
3191 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3192 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3193 } else {
3194 jbd2_journal_clear_features(sbi->s_journal,
3195 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3196 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3197 JBD2_FEATURE_INCOMPAT_CSUM_V2);
3198 }
3199
3200 return ret;
3201}
3202
Theodore Ts'o952fc182012-07-09 16:27:05 -04003203/*
3204 * Note: calculating the overhead so we can be compatible with
3205 * historical BSD practice is quite difficult in the face of
3206 * clusters/bigalloc. This is because multiple metadata blocks from
3207 * different block group can end up in the same allocation cluster.
3208 * Calculating the exact overhead in the face of clustered allocation
3209 * requires either O(all block bitmaps) in memory or O(number of block
3210 * groups**2) in time. We will still calculate the superblock for
3211 * older file systems --- and if we come across with a bigalloc file
3212 * system with zero in s_overhead_clusters the estimate will be close to
3213 * correct especially for very large cluster sizes --- but for newer
3214 * file systems, it's better to calculate this figure once at mkfs
3215 * time, and store it in the superblock. If the superblock value is
3216 * present (even for non-bigalloc file systems), we will use it.
3217 */
3218static int count_overhead(struct super_block *sb, ext4_group_t grp,
3219 char *buf)
3220{
3221 struct ext4_sb_info *sbi = EXT4_SB(sb);
3222 struct ext4_group_desc *gdp;
3223 ext4_fsblk_t first_block, last_block, b;
3224 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3225 int s, j, count = 0;
3226
Theodore Ts'o0548bbb2012-08-16 11:59:04 -04003227 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC))
3228 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3229 sbi->s_itb_per_group + 2);
3230
Theodore Ts'o952fc182012-07-09 16:27:05 -04003231 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3232 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3233 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3234 for (i = 0; i < ngroups; i++) {
3235 gdp = ext4_get_group_desc(sb, i, NULL);
3236 b = ext4_block_bitmap(sb, gdp);
3237 if (b >= first_block && b <= last_block) {
3238 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3239 count++;
3240 }
3241 b = ext4_inode_bitmap(sb, gdp);
3242 if (b >= first_block && b <= last_block) {
3243 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3244 count++;
3245 }
3246 b = ext4_inode_table(sb, gdp);
3247 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3248 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3249 int c = EXT4_B2C(sbi, b - first_block);
3250 ext4_set_bit(c, buf);
3251 count++;
3252 }
3253 if (i != grp)
3254 continue;
3255 s = 0;
3256 if (ext4_bg_has_super(sb, grp)) {
3257 ext4_set_bit(s++, buf);
3258 count++;
3259 }
3260 for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) {
3261 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3262 count++;
3263 }
3264 }
3265 if (!count)
3266 return 0;
3267 return EXT4_CLUSTERS_PER_GROUP(sb) -
3268 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3269}
3270
3271/*
3272 * Compute the overhead and stash it in sbi->s_overhead
3273 */
3274int ext4_calculate_overhead(struct super_block *sb)
3275{
3276 struct ext4_sb_info *sbi = EXT4_SB(sb);
3277 struct ext4_super_block *es = sbi->s_es;
3278 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3279 ext4_fsblk_t overhead = 0;
3280 char *buf = (char *) get_zeroed_page(GFP_KERNEL);
3281
Theodore Ts'o952fc182012-07-09 16:27:05 -04003282 if (!buf)
3283 return -ENOMEM;
3284
3285 /*
3286 * Compute the overhead (FS structures). This is constant
3287 * for a given filesystem unless the number of block groups
3288 * changes so we cache the previous value until it does.
3289 */
3290
3291 /*
3292 * All of the blocks before first_data_block are overhead
3293 */
3294 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3295
3296 /*
3297 * Add the overhead found in each block group
3298 */
3299 for (i = 0; i < ngroups; i++) {
3300 int blks;
3301
3302 blks = count_overhead(sb, i, buf);
3303 overhead += blks;
3304 if (blks)
3305 memset(buf, 0, PAGE_SIZE);
3306 cond_resched();
3307 }
Eric Sandeen0875a2b2012-12-25 13:56:01 -05003308 /* Add the journal blocks as well */
3309 if (sbi->s_journal)
Lukas Czerner810da242013-03-02 17:18:58 -05003310 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
Eric Sandeen0875a2b2012-12-25 13:56:01 -05003311
Theodore Ts'o952fc182012-07-09 16:27:05 -04003312 sbi->s_overhead = overhead;
3313 smp_wmb();
3314 free_page((unsigned long) buf);
3315 return 0;
3316}
3317
Lukas Czerner27dd4382013-04-09 22:11:22 -04003318
Jan Kara30fac0f2013-12-08 21:11:59 -05003319static ext4_fsblk_t ext4_calculate_resv_clusters(struct super_block *sb)
Lukas Czerner27dd4382013-04-09 22:11:22 -04003320{
3321 ext4_fsblk_t resv_clusters;
3322
3323 /*
Jan Kara30fac0f2013-12-08 21:11:59 -05003324 * There's no need to reserve anything when we aren't using extents.
3325 * The space estimates are exact, there are no unwritten extents,
3326 * hole punching doesn't need new metadata... This is needed especially
3327 * to keep ext2/3 backward compatibility.
3328 */
3329 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS))
3330 return 0;
3331 /*
Lukas Czerner27dd4382013-04-09 22:11:22 -04003332 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3333 * This should cover the situations where we can not afford to run
3334 * out of space like for example punch hole, or converting
3335 * uninitialized extents in delalloc path. In most cases such
3336 * allocation would require 1, or 2 blocks, higher numbers are
3337 * very rare.
3338 */
Jan Kara30fac0f2013-12-08 21:11:59 -05003339 resv_clusters = ext4_blocks_count(EXT4_SB(sb)->s_es) >>
3340 EXT4_SB(sb)->s_cluster_bits;
Lukas Czerner27dd4382013-04-09 22:11:22 -04003341
3342 do_div(resv_clusters, 50);
3343 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3344
3345 return resv_clusters;
3346}
3347
3348
3349static int ext4_reserve_clusters(struct ext4_sb_info *sbi, ext4_fsblk_t count)
3350{
3351 ext4_fsblk_t clusters = ext4_blocks_count(sbi->s_es) >>
3352 sbi->s_cluster_bits;
3353
3354 if (count >= clusters)
3355 return -EINVAL;
3356
3357 atomic64_set(&sbi->s_resv_clusters, count);
3358 return 0;
3359}
3360
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04003361static int ext4_fill_super(struct super_block *sb, void *data, int silent)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003362{
Curt Wohlgemuthd4c402d2010-05-16 12:00:00 -04003363 char *orig_data = kstrdup(data, GFP_KERNEL);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04003364 struct buffer_head *bh;
Mingming Cao617ba132006-10-11 01:20:53 -07003365 struct ext4_super_block *es = NULL;
3366 struct ext4_sb_info *sbi;
3367 ext4_fsblk_t block;
3368 ext4_fsblk_t sb_block = get_sb_block(&data);
Andrew Morton70bbb3e2006-10-11 01:21:20 -07003369 ext4_fsblk_t logical_sb_block;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003370 unsigned long offset = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003371 unsigned long journal_devnum = 0;
3372 unsigned long def_mount_opts;
3373 struct inode *root;
Theodore Ts'o9f6200b2008-09-23 09:18:24 -04003374 char *cp;
Frank Mayhar03901312009-01-07 00:06:22 -05003375 const char *descr;
Cyrill Gorcunovdcc7dae2010-07-27 11:56:07 -04003376 int ret = -ENOMEM;
Theodore Ts'o281b5992011-09-09 18:34:51 -04003377 int blocksize, clustersize;
Theodore Ts'o4ec11022009-01-06 14:53:26 -05003378 unsigned int db_count;
3379 unsigned int i;
Theodore Ts'o281b5992011-09-09 18:34:51 -04003380 int needs_recovery, has_huge_files, has_bigalloc;
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07003381 __u64 blocks_count;
Lukas Czerner07aa2ea2012-11-08 15:16:54 -05003382 int err = 0;
Theodore Ts'ob3881f72009-01-05 22:46:26 -05003383 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
Lukas Czernerbfff6872010-10-27 21:30:05 -04003384 ext4_group_t first_not_zeroed;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003385
3386 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3387 if (!sbi)
Cyrill Gorcunovdcc7dae2010-07-27 11:56:07 -04003388 goto out_free_orig;
Pekka Enberg705895b2009-02-15 18:07:52 -05003389
3390 sbi->s_blockgroup_lock =
3391 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3392 if (!sbi->s_blockgroup_lock) {
3393 kfree(sbi);
Cyrill Gorcunovdcc7dae2010-07-27 11:56:07 -04003394 goto out_free_orig;
Pekka Enberg705895b2009-02-15 18:07:52 -05003395 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003396 sb->s_fs_info = sbi;
Theodore Ts'o2c0544b2012-05-30 22:56:46 -04003397 sbi->s_sb = sb;
Theodore Ts'o240799c2008-10-09 23:53:47 -04003398 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
Miklos Szeredid9c9bef12007-10-16 23:26:27 -07003399 sbi->s_sb_block = sb_block;
Theodore Ts'of613dfc2010-07-27 11:56:08 -04003400 if (sb->s_bdev->bd_part)
3401 sbi->s_sectors_written_start =
3402 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003403
Theodore Ts'o9f6200b2008-09-23 09:18:24 -04003404 /* Cleanup superblock name */
3405 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
3406 *cp = '!';
3407
Lukas Czerner07aa2ea2012-11-08 15:16:54 -05003408 /* -EINVAL is default */
Cyrill Gorcunovdcc7dae2010-07-27 11:56:07 -04003409 ret = -EINVAL;
Mingming Cao617ba132006-10-11 01:20:53 -07003410 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003411 if (!blocksize) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003412 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003413 goto out_fail;
3414 }
3415
3416 /*
Mingming Cao617ba132006-10-11 01:20:53 -07003417 * The ext4 superblock will not be buffer aligned for other than 1kB
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003418 * block sizes. We need to calculate the offset from buffer start.
3419 */
Mingming Cao617ba132006-10-11 01:20:53 -07003420 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
Andrew Morton70bbb3e2006-10-11 01:21:20 -07003421 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3422 offset = do_div(logical_sb_block, blocksize);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003423 } else {
Andrew Morton70bbb3e2006-10-11 01:21:20 -07003424 logical_sb_block = sb_block;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003425 }
3426
Andrew Morton70bbb3e2006-10-11 01:21:20 -07003427 if (!(bh = sb_bread(sb, logical_sb_block))) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003428 ext4_msg(sb, KERN_ERR, "unable to read superblock");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003429 goto out_fail;
3430 }
3431 /*
3432 * Note: s_es must be initialized as soon as possible because
Mingming Cao617ba132006-10-11 01:20:53 -07003433 * some ext4 macro-instructions depend on its value
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003434 */
Theodore Ts'o2716b802012-05-28 17:47:52 -04003435 es = (struct ext4_super_block *) (bh->b_data + offset);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003436 sbi->s_es = es;
3437 sb->s_magic = le16_to_cpu(es->s_magic);
Mingming Cao617ba132006-10-11 01:20:53 -07003438 if (sb->s_magic != EXT4_SUPER_MAGIC)
3439 goto cantfind_ext4;
Theodore Ts'oafc32f72009-02-28 19:39:58 -05003440 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003441
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04003442 /* Warn if metadata_csum and gdt_csum are both set. */
3443 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3444 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
3445 EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
3446 ext4_warning(sb, KERN_INFO "metadata_csum and uninit_bg are "
3447 "redundant flags; please run fsck.");
3448
Darrick J. Wongd25425f2012-04-29 18:25:10 -04003449 /* Check for a known checksum algorithm */
3450 if (!ext4_verify_csum_type(sb, es)) {
3451 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3452 "unknown checksum algorithm.");
3453 silent = 1;
3454 goto cantfind_ext4;
3455 }
3456
Darrick J. Wong04419842012-04-29 18:27:10 -04003457 /* Load the checksum driver */
3458 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3459 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3460 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3461 if (IS_ERR(sbi->s_chksum_driver)) {
3462 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3463 ret = PTR_ERR(sbi->s_chksum_driver);
3464 sbi->s_chksum_driver = NULL;
3465 goto failed_mount;
3466 }
3467 }
3468
Darrick J. Wonga9c473172012-04-29 18:29:10 -04003469 /* Check superblock checksum */
3470 if (!ext4_superblock_csum_verify(sb, es)) {
3471 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3472 "invalid superblock checksum. Run e2fsck?");
3473 silent = 1;
3474 goto cantfind_ext4;
3475 }
3476
3477 /* Precompute checksum seed for all metadata */
3478 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3479 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
3480 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3481 sizeof(es->s_uuid));
3482
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003483 /* Set defaults before we parse the mount options */
3484 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05003485 set_opt(sb, INIT_INODE_TABLE);
Mingming Cao617ba132006-10-11 01:20:53 -07003486 if (def_mount_opts & EXT4_DEFM_DEBUG)
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05003487 set_opt(sb, DEBUG);
Theodore Ts'o87f26802012-03-02 00:03:21 -05003488 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05003489 set_opt(sb, GRPID);
Mingming Cao617ba132006-10-11 01:20:53 -07003490 if (def_mount_opts & EXT4_DEFM_UID16)
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05003491 set_opt(sb, NO_UID32);
Eric Sandeenea663332011-02-23 17:51:51 -05003492 /* xattr user namespace & acls are now defaulted on */
Eric Sandeenea663332011-02-23 17:51:51 -05003493 set_opt(sb, XATTR_USER);
Theodore Ts'o03010a32008-10-10 20:02:48 -04003494#ifdef CONFIG_EXT4_FS_POSIX_ACL
Eric Sandeenea663332011-02-23 17:51:51 -05003495 set_opt(sb, POSIX_ACL);
Hugh Dickins2e7842b2007-02-10 01:46:13 -08003496#endif
Mingming Cao617ba132006-10-11 01:20:53 -07003497 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05003498 set_opt(sb, JOURNAL_DATA);
Mingming Cao617ba132006-10-11 01:20:53 -07003499 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05003500 set_opt(sb, ORDERED_DATA);
Mingming Cao617ba132006-10-11 01:20:53 -07003501 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05003502 set_opt(sb, WRITEBACK_DATA);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003503
Mingming Cao617ba132006-10-11 01:20:53 -07003504 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05003505 set_opt(sb, ERRORS_PANIC);
Aneesh Kumar K.Vbb4f3972008-01-28 23:58:26 -05003506 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05003507 set_opt(sb, ERRORS_CONT);
Aneesh Kumar K.Vbb4f3972008-01-28 23:58:26 -05003508 else
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05003509 set_opt(sb, ERRORS_RO);
Theodore Ts'o8b67f042010-08-01 23:14:20 -04003510 if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05003511 set_opt(sb, BLOCK_VALIDITY);
Theodore Ts'o8b67f042010-08-01 23:14:20 -04003512 if (def_mount_opts & EXT4_DEFM_DISCARD)
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05003513 set_opt(sb, DISCARD);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003514
Eric W. Biederman08cefc72012-02-07 15:41:49 -08003515 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3516 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
Theodore Ts'o30773842009-01-03 20:27:38 -05003517 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3518 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3519 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003520
Theodore Ts'o8b67f042010-08-01 23:14:20 -04003521 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05003522 set_opt(sb, BARRIER);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003523
Mingming Cao1e2462f2007-07-18 09:00:55 -04003524 /*
Aneesh Kumar K.Vdd919b92008-07-11 19:27:31 -04003525 * enable delayed allocation by default
3526 * Use -o nodelalloc to turn it off
3527 */
Theodore Ts'obc0b75f2012-09-17 22:54:36 -04003528 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
Theodore Ts'o8b67f042010-08-01 23:14:20 -04003529 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05003530 set_opt(sb, DELALLOC);
Aneesh Kumar K.Vdd919b92008-07-11 19:27:31 -04003531
Lukas Czerner51ce6512011-05-20 13:55:16 -04003532 /*
3533 * set default s_li_wait_mult for lazyinit, for the case there is
3534 * no mount option specified.
3535 */
3536 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3537
Theodore Ts'o8b67f042010-08-01 23:14:20 -04003538 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
Eric Sandeen661aa522012-02-20 17:53:04 -05003539 &journal_devnum, &journal_ioprio, 0)) {
Theodore Ts'o8b67f042010-08-01 23:14:20 -04003540 ext4_msg(sb, KERN_WARNING,
3541 "failed to parse options in superblock: %s",
3542 sbi->s_es->s_mount_opts);
3543 }
Theodore Ts'o5a916be2012-03-04 19:27:31 -05003544 sbi->s_def_mount_opt = sbi->s_mount_opt;
Theodore Ts'ob3881f72009-01-05 22:46:26 -05003545 if (!parse_options((char *) data, sb, &journal_devnum,
Eric Sandeen661aa522012-02-20 17:53:04 -05003546 &journal_ioprio, 0))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003547 goto failed_mount;
3548
Theodore Ts'o56889782011-09-03 18:22:38 -04003549 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3550 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3551 "with data=journal disables delayed "
3552 "allocation and O_DIRECT support!\n");
3553 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3554 ext4_msg(sb, KERN_ERR, "can't mount with "
3555 "both data=journal and delalloc");
3556 goto failed_mount;
3557 }
3558 if (test_opt(sb, DIOREAD_NOLOCK)) {
3559 ext4_msg(sb, KERN_ERR, "can't mount with "
Piotr Sarna6ae65142013-08-08 23:02:24 -04003560 "both data=journal and dioread_nolock");
Theodore Ts'o56889782011-09-03 18:22:38 -04003561 goto failed_mount;
3562 }
3563 if (test_opt(sb, DELALLOC))
3564 clear_opt(sb, DELALLOC);
3565 }
3566
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003567 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
Dmitry Monakhov482a7422010-02-24 11:35:32 -05003568 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003569
Mingming Cao617ba132006-10-11 01:20:53 -07003570 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3571 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3572 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3573 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
Eric Sandeenb31e1552009-06-04 17:36:36 -04003574 ext4_msg(sb, KERN_WARNING,
3575 "feature flags set on rev 0 fs, "
3576 "running e2fsck is recommended");
Theodore Tso469108f2008-02-10 01:11:44 -05003577
Theodore Ts'o2035e772011-04-18 17:29:14 -04003578 if (IS_EXT2_SB(sb)) {
3579 if (ext2_feature_set_ok(sb))
3580 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3581 "using the ext4 subsystem");
3582 else {
3583 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3584 "to feature incompatibilities");
3585 goto failed_mount;
3586 }
3587 }
3588
3589 if (IS_EXT3_SB(sb)) {
3590 if (ext3_feature_set_ok(sb))
3591 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3592 "using the ext4 subsystem");
3593 else {
3594 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3595 "to feature incompatibilities");
3596 goto failed_mount;
3597 }
3598 }
3599
Theodore Tso469108f2008-02-10 01:11:44 -05003600 /*
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003601 * Check feature flags regardless of the revision level, since we
3602 * previously didn't change the revision level when setting the flags,
3603 * so there is a chance incompat flags are set on a rev 0 filesystem.
3604 */
Eric Sandeena13fb1a2009-08-18 00:20:23 -04003605 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003606 goto failed_mount;
Eric Sandeena13fb1a2009-08-18 00:20:23 -04003607
Jan Kara261cb20c2012-12-20 00:07:18 -05003608 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
Mingming Cao617ba132006-10-11 01:20:53 -07003609 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3610 blocksize > EXT4_MAX_BLOCK_SIZE) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003611 ext4_msg(sb, KERN_ERR,
3612 "Unsupported filesystem blocksize %d", blocksize);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003613 goto failed_mount;
3614 }
3615
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003616 if (sb->s_blocksize != blocksize) {
Aneesh Kumar K.Vce407332008-01-28 23:58:27 -05003617 /* Validate the filesystem blocksize */
3618 if (!sb_set_blocksize(sb, blocksize)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003619 ext4_msg(sb, KERN_ERR, "bad block size %d",
Aneesh Kumar K.Vce407332008-01-28 23:58:27 -05003620 blocksize);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003621 goto failed_mount;
3622 }
3623
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04003624 brelse(bh);
Andrew Morton70bbb3e2006-10-11 01:21:20 -07003625 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3626 offset = do_div(logical_sb_block, blocksize);
3627 bh = sb_bread(sb, logical_sb_block);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003628 if (!bh) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003629 ext4_msg(sb, KERN_ERR,
3630 "Can't read superblock on 2nd try");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003631 goto failed_mount;
3632 }
Theodore Ts'o2716b802012-05-28 17:47:52 -04003633 es = (struct ext4_super_block *)(bh->b_data + offset);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003634 sbi->s_es = es;
Mingming Cao617ba132006-10-11 01:20:53 -07003635 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003636 ext4_msg(sb, KERN_ERR,
3637 "Magic mismatch, very weird!");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003638 goto failed_mount;
3639 }
3640 }
3641
Eric Sandeena13fb1a2009-08-18 00:20:23 -04003642 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3643 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
Theodore Ts'of287a1a2008-10-16 22:50:48 -04003644 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3645 has_huge_files);
3646 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003647
Mingming Cao617ba132006-10-11 01:20:53 -07003648 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3649 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3650 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003651 } else {
3652 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3653 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
Mingming Cao617ba132006-10-11 01:20:53 -07003654 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
Vignesh Babu13305932007-07-18 09:11:02 -04003655 (!is_power_of_2(sbi->s_inode_size)) ||
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003656 (sbi->s_inode_size > blocksize)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003657 ext4_msg(sb, KERN_ERR,
3658 "unsupported inode size: %d",
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04003659 sbi->s_inode_size);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003660 goto failed_mount;
3661 }
Kalpak Shahef7f3832007-07-18 09:15:20 -04003662 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3663 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003664 }
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04003665
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07003666 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3667 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07003668 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07003669 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
vignesh babud8ea6cf2007-10-16 23:27:14 -07003670 !is_power_of_2(sbi->s_desc_size)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003671 ext4_msg(sb, KERN_ERR,
3672 "unsupported descriptor size %lu",
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07003673 sbi->s_desc_size);
3674 goto failed_mount;
3675 }
3676 } else
3677 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04003678
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003679 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003680 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
Andries E. Brouwerb47b6f32007-12-17 16:19:55 -08003681 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
Mingming Cao617ba132006-10-11 01:20:53 -07003682 goto cantfind_ext4;
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04003683
Mingming Cao617ba132006-10-11 01:20:53 -07003684 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003685 if (sbi->s_inodes_per_block == 0)
Mingming Cao617ba132006-10-11 01:20:53 -07003686 goto cantfind_ext4;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003687 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3688 sbi->s_inodes_per_block;
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07003689 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003690 sbi->s_sbh = bh;
3691 sbi->s_mount_state = le16_to_cpu(es->s_state);
Fengguang Wue57aa832007-10-16 23:26:25 -07003692 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3693 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04003694
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04003695 for (i = 0; i < 4; i++)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003696 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3697 sbi->s_def_hash_version = es->s_def_hash_version;
Theodore Ts'of99b2582008-10-28 13:21:44 -04003698 i = le32_to_cpu(es->s_flags);
3699 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3700 sbi->s_hash_unsigned = 3;
3701 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3702#ifdef __CHAR_UNSIGNED__
3703 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3704 sbi->s_hash_unsigned = 3;
3705#else
3706 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3707#endif
Theodore Ts'of99b2582008-10-28 13:21:44 -04003708 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003709
Theodore Ts'o281b5992011-09-09 18:34:51 -04003710 /* Handle clustersize */
3711 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3712 has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3713 EXT4_FEATURE_RO_COMPAT_BIGALLOC);
3714 if (has_bigalloc) {
3715 if (clustersize < blocksize) {
3716 ext4_msg(sb, KERN_ERR,
3717 "cluster size (%d) smaller than "
3718 "block size (%d)", clustersize, blocksize);
3719 goto failed_mount;
3720 }
3721 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3722 le32_to_cpu(es->s_log_block_size);
3723 sbi->s_clusters_per_group =
3724 le32_to_cpu(es->s_clusters_per_group);
3725 if (sbi->s_clusters_per_group > blocksize * 8) {
3726 ext4_msg(sb, KERN_ERR,
3727 "#clusters per group too big: %lu",
3728 sbi->s_clusters_per_group);
3729 goto failed_mount;
3730 }
3731 if (sbi->s_blocks_per_group !=
3732 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3733 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3734 "clusters per group (%lu) inconsistent",
3735 sbi->s_blocks_per_group,
3736 sbi->s_clusters_per_group);
3737 goto failed_mount;
3738 }
3739 } else {
3740 if (clustersize != blocksize) {
3741 ext4_warning(sb, "fragment/cluster size (%d) != "
3742 "block size (%d)", clustersize,
3743 blocksize);
3744 clustersize = blocksize;
3745 }
3746 if (sbi->s_blocks_per_group > blocksize * 8) {
3747 ext4_msg(sb, KERN_ERR,
3748 "#blocks per group too big: %lu",
3749 sbi->s_blocks_per_group);
3750 goto failed_mount;
3751 }
3752 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3753 sbi->s_cluster_bits = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003754 }
Theodore Ts'o281b5992011-09-09 18:34:51 -04003755 sbi->s_cluster_ratio = clustersize / blocksize;
3756
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003757 if (sbi->s_inodes_per_group > blocksize * 8) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003758 ext4_msg(sb, KERN_ERR,
3759 "#inodes per group too big: %lu",
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04003760 sbi->s_inodes_per_group);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003761 goto failed_mount;
3762 }
3763
Theodore Ts'o960fd8562013-07-05 23:11:16 -04003764 /* Do we have standard group size of clustersize * 8 blocks ? */
3765 if (sbi->s_blocks_per_group == clustersize << 3)
3766 set_opt2(sb, STD_GROUP_SIZE);
3767
Eric Sandeenbf43d842009-08-17 23:48:51 -04003768 /*
3769 * Test whether we have more sectors than will fit in sector_t,
3770 * and whether the max offset is addressable by the page cache.
3771 */
Darrick J. Wong5a9ae682010-11-19 09:56:44 -05003772 err = generic_check_addressable(sb->s_blocksize_bits,
Patrick J. LoPresti30ca22c2010-07-22 15:03:41 -07003773 ext4_blocks_count(es));
Darrick J. Wong5a9ae682010-11-19 09:56:44 -05003774 if (err) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003775 ext4_msg(sb, KERN_ERR, "filesystem"
Eric Sandeenbf43d842009-08-17 23:48:51 -04003776 " too large to mount safely on this system");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003777 if (sizeof(sector_t) < 8)
Bartlomiej Zolnierkiewicz90c699a2009-06-19 08:08:50 +02003778 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003779 goto failed_mount;
3780 }
3781
Mingming Cao617ba132006-10-11 01:20:53 -07003782 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3783 goto cantfind_ext4;
Eric Sandeene7c95592008-01-28 23:58:27 -05003784
From: Thiemo Nagel0f2ddca2009-04-07 14:07:47 -04003785 /* check blocks count against device size */
3786 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3787 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003788 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3789 "exceeds size of device (%llu blocks)",
From: Thiemo Nagel0f2ddca2009-04-07 14:07:47 -04003790 ext4_blocks_count(es), blocks_count);
3791 goto failed_mount;
3792 }
3793
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04003794 /*
3795 * It makes no sense for the first data block to be beyond the end
3796 * of the filesystem.
3797 */
3798 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
Zheng Liu5635a622011-12-18 16:13:58 -05003799 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
Eric Sandeenb31e1552009-06-04 17:36:36 -04003800 "block %u is beyond end of filesystem (%llu)",
3801 le32_to_cpu(es->s_first_data_block),
3802 ext4_blocks_count(es));
Eric Sandeene7c95592008-01-28 23:58:27 -05003803 goto failed_mount;
3804 }
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07003805 blocks_count = (ext4_blocks_count(es) -
3806 le32_to_cpu(es->s_first_data_block) +
3807 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3808 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
Theodore Ts'o4ec11022009-01-06 14:53:26 -05003809 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003810 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
Theodore Ts'o4ec11022009-01-06 14:53:26 -05003811 "(block count %llu, first data block %u, "
Eric Sandeenb31e1552009-06-04 17:36:36 -04003812 "blocks per group %lu)", sbi->s_groups_count,
Theodore Ts'o4ec11022009-01-06 14:53:26 -05003813 ext4_blocks_count(es),
3814 le32_to_cpu(es->s_first_data_block),
3815 EXT4_BLOCKS_PER_GROUP(sb));
3816 goto failed_mount;
3817 }
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07003818 sbi->s_groups_count = blocks_count;
Eric Sandeenfb0a3872009-09-16 14:45:10 -04003819 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3820 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
Mingming Cao617ba132006-10-11 01:20:53 -07003821 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3822 EXT4_DESC_PER_BLOCK(sb);
Theodore Ts'of18a5f22011-08-01 08:45:38 -04003823 sbi->s_group_desc = ext4_kvmalloc(db_count *
3824 sizeof(struct buffer_head *),
3825 GFP_KERNEL);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003826 if (sbi->s_group_desc == NULL) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003827 ext4_msg(sb, KERN_ERR, "not enough memory");
Theodore Ts'o2cde4172012-05-28 17:49:54 -04003828 ret = -ENOMEM;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003829 goto failed_mount;
3830 }
3831
Theodore Ts'o9f6200b2008-09-23 09:18:24 -04003832 if (ext4_proc_root)
3833 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
Theodore Ts'o240799c2008-10-09 23:53:47 -04003834
Theodore Ts'o66acdcf2012-03-04 20:21:38 -05003835 if (sbi->s_proc)
3836 proc_create_data("options", S_IRUGO, sbi->s_proc,
3837 &ext4_seq_options_fops, sb);
3838
Pekka Enberg705895b2009-02-15 18:07:52 -05003839 bgl_lock_init(sbi->s_blockgroup_lock);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003840
3841 for (i = 0; i < db_count; i++) {
Andrew Morton70bbb3e2006-10-11 01:21:20 -07003842 block = descriptor_loc(sb, logical_sb_block, i);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003843 sbi->s_group_desc[i] = sb_bread(sb, block);
3844 if (!sbi->s_group_desc[i]) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003845 ext4_msg(sb, KERN_ERR,
3846 "can't read group descriptor %d", i);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003847 db_count = i;
3848 goto failed_mount2;
3849 }
3850 }
Lukas Czernerbfff6872010-10-27 21:30:05 -04003851 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003852 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003853 goto failed_mount2;
3854 }
Jose R. Santos772cb7c2008-07-11 19:27:31 -04003855 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
3856 if (!ext4_fill_flex_info(sb)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003857 ext4_msg(sb, KERN_ERR,
3858 "unable to initialize "
3859 "flex_bg meta info!");
Jose R. Santos772cb7c2008-07-11 19:27:31 -04003860 goto failed_mount2;
3861 }
3862
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003863 sbi->s_gdb_count = db_count;
3864 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3865 spin_lock_init(&sbi->s_next_gen_lock);
3866
Tao Ma04496412011-04-05 19:55:28 -04003867 init_timer(&sbi->s_err_report);
3868 sbi->s_err_report.function = print_daily_error_info;
3869 sbi->s_err_report.data = (unsigned long) sb;
3870
Dmitry Monakhova75ae78f2013-04-03 22:10:52 -04003871 /* Register extent status tree shrinker */
Zheng Liud3922a72013-07-01 08:12:37 -04003872 ext4_es_register_shrinker(sbi);
Dmitry Monakhova75ae78f2013-04-03 22:10:52 -04003873
Theodore Ts'o57042652011-09-09 18:56:51 -04003874 err = percpu_counter_init(&sbi->s_freeclusters_counter,
Theodore Ts'o5dee5432011-09-09 19:10:51 -04003875 ext4_count_free_clusters(sb));
Theodore Ts'oce7e0102010-11-03 12:03:21 -04003876 if (!err) {
3877 err = percpu_counter_init(&sbi->s_freeinodes_counter,
3878 ext4_count_free_inodes(sb));
3879 }
3880 if (!err) {
3881 err = percpu_counter_init(&sbi->s_dirs_counter,
3882 ext4_count_dirs(sb));
3883 }
3884 if (!err) {
Theodore Ts'o57042652011-09-09 18:56:51 -04003885 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
Theodore Ts'oce7e0102010-11-03 12:03:21 -04003886 }
Theodore Ts'o1ac64662013-03-02 10:27:46 -05003887 if (!err) {
3888 err = percpu_counter_init(&sbi->s_extent_cache_cnt, 0);
3889 }
Theodore Ts'oce7e0102010-11-03 12:03:21 -04003890 if (err) {
3891 ext4_msg(sb, KERN_ERR, "insufficient memory");
3892 goto failed_mount3;
3893 }
3894
Alex Tomasc9de5602008-01-29 00:19:52 -05003895 sbi->s_stripe = ext4_get_stripe_size(sbi);
Zheng Liu67a5da52012-08-17 09:54:17 -04003896 sbi->s_extent_max_zeroout_kb = 32;
Alex Tomasc9de5602008-01-29 00:19:52 -05003897
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003898 /*
3899 * set up enough so that it can read an inode
3900 */
Theodore Ts'o9ca92382009-05-01 12:52:25 -04003901 if (!test_opt(sb, NOLOAD) &&
3902 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
3903 sb->s_op = &ext4_sops;
3904 else
3905 sb->s_op = &ext4_nojournal_sops;
Mingming Cao617ba132006-10-11 01:20:53 -07003906 sb->s_export_op = &ext4_export_ops;
3907 sb->s_xattr = ext4_xattr_handlers;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003908#ifdef CONFIG_QUOTA
Mingming Cao617ba132006-10-11 01:20:53 -07003909 sb->dq_op = &ext4_quota_operations;
Jan Kara262b4662013-03-02 17:57:08 -05003910 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
Aditya Kali7c319d32012-07-22 20:21:31 -04003911 sb->s_qcop = &ext4_qctl_sysfile_operations;
Jan Kara262b4662013-03-02 17:57:08 -05003912 else
3913 sb->s_qcop = &ext4_qctl_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003914#endif
Aneesh Kumar K.Vf2fa2ff2011-01-29 18:43:40 +05303915 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3916
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003917 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
Theodore Ts'o3b9d4ed2009-04-25 22:54:04 -04003918 mutex_init(&sbi->s_orphan_lock);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003919
3920 sb->s_root = NULL;
3921
3922 needs_recovery = (es->s_last_orphan != 0 ||
Mingming Cao617ba132006-10-11 01:20:53 -07003923 EXT4_HAS_INCOMPAT_FEATURE(sb,
3924 EXT4_FEATURE_INCOMPAT_RECOVER));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003925
Johann Lombardic5e06d12011-05-24 18:31:25 -04003926 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
3927 !(sb->s_flags & MS_RDONLY))
3928 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
3929 goto failed_mount3;
3930
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003931 /*
3932 * The first inode we look at is the journal inode. Don't try
3933 * root first: it may be modified in the journal!
3934 */
3935 if (!test_opt(sb, NOLOAD) &&
Mingming Cao617ba132006-10-11 01:20:53 -07003936 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3937 if (ext4_load_journal(sb, es, journal_devnum))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003938 goto failed_mount3;
Frank Mayhar03901312009-01-07 00:06:22 -05003939 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3940 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003941 ext4_msg(sb, KERN_ERR, "required journal recovery "
3942 "suppressed and not mounted read-only");
Jiaying Zhang744692d2010-03-04 16:14:02 -05003943 goto failed_mount_wq;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003944 } else {
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05003945 clear_opt(sb, DATA_FLAGS);
Frank Mayhar03901312009-01-07 00:06:22 -05003946 sbi->s_journal = NULL;
3947 needs_recovery = 0;
3948 goto no_journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003949 }
3950
Theodore Ts'of32aaf22012-05-21 11:42:02 -04003951 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT) &&
Jose R. Santoseb40a092007-07-18 08:37:25 -04003952 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3953 JBD2_FEATURE_INCOMPAT_64BIT)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003954 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
Jiaying Zhang744692d2010-03-04 16:14:02 -05003955 goto failed_mount_wq;
Jose R. Santoseb40a092007-07-18 08:37:25 -04003956 }
3957
Darrick J. Wong25ed6e82012-05-27 07:48:56 -04003958 if (!set_journal_csum_feature_set(sb)) {
3959 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
3960 "feature set");
3961 goto failed_mount_wq;
Linus Torvaldsd4da6c92009-11-02 10:15:27 -08003962 }
Girish Shilamkar818d2762008-01-28 23:58:27 -05003963
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003964 /* We have now updated the journal if required, so we can
3965 * validate the data journaling mode. */
3966 switch (test_opt(sb, DATA_FLAGS)) {
3967 case 0:
3968 /* No mode set, assume a default based on the journal
Andrew Morton63f57932006-10-11 01:21:24 -07003969 * capabilities: ORDERED_DATA if the journal can
3970 * cope, else JOURNAL_DATA
3971 */
Mingming Caodab291a2006-10-11 01:21:01 -07003972 if (jbd2_journal_check_available_features
3973 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05003974 set_opt(sb, ORDERED_DATA);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003975 else
Theodore Ts'ofd8c37e2010-12-15 20:26:48 -05003976 set_opt(sb, JOURNAL_DATA);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003977 break;
3978
Mingming Cao617ba132006-10-11 01:20:53 -07003979 case EXT4_MOUNT_ORDERED_DATA:
3980 case EXT4_MOUNT_WRITEBACK_DATA:
Mingming Caodab291a2006-10-11 01:21:01 -07003981 if (!jbd2_journal_check_available_features
3982 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003983 ext4_msg(sb, KERN_ERR, "Journal does not support "
3984 "requested data journaling mode");
Jiaying Zhang744692d2010-03-04 16:14:02 -05003985 goto failed_mount_wq;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003986 }
3987 default:
3988 break;
3989 }
Theodore Ts'ob3881f72009-01-05 22:46:26 -05003990 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003991
Bobi Jam18aadd42012-02-20 17:53:02 -05003992 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
3993
Theodore Ts'oce7e0102010-11-03 12:03:21 -04003994 /*
3995 * The journal may have updated the bg summary counts, so we
3996 * need to update the global counters.
3997 */
Theodore Ts'o57042652011-09-09 18:56:51 -04003998 percpu_counter_set(&sbi->s_freeclusters_counter,
Theodore Ts'o5dee5432011-09-09 19:10:51 -04003999 ext4_count_free_clusters(sb));
Theodore Ts'oce7e0102010-11-03 12:03:21 -04004000 percpu_counter_set(&sbi->s_freeinodes_counter,
4001 ext4_count_free_inodes(sb));
4002 percpu_counter_set(&sbi->s_dirs_counter,
4003 ext4_count_dirs(sb));
Theodore Ts'o57042652011-09-09 18:56:51 -04004004 percpu_counter_set(&sbi->s_dirtyclusters_counter, 0);
Christoph Hellwig206f7ab2010-06-14 14:42:49 -04004005
Theodore Ts'oce7e0102010-11-03 12:03:21 -04004006no_journal:
Tejun Heofd89d5f2011-02-01 11:42:42 +01004007 /*
Theodore Ts'o952fc182012-07-09 16:27:05 -04004008 * Get the # of file system overhead blocks from the
4009 * superblock if present.
4010 */
4011 if (es->s_overhead_clusters)
4012 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
4013 else {
Lukas Czerner07aa2ea2012-11-08 15:16:54 -05004014 err = ext4_calculate_overhead(sb);
4015 if (err)
Theodore Ts'o952fc182012-07-09 16:27:05 -04004016 goto failed_mount_wq;
4017 }
4018
4019 /*
Tejun Heofd89d5f2011-02-01 11:42:42 +01004020 * The maximum number of concurrent works can be high and
4021 * concurrency isn't really necessary. Limit it to 1.
4022 */
Jan Kara2e8fa542013-06-04 14:21:02 -04004023 EXT4_SB(sb)->rsv_conversion_wq =
4024 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4025 if (!EXT4_SB(sb)->rsv_conversion_wq) {
4026 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
Lukas Czerner07aa2ea2012-11-08 15:16:54 -05004027 ret = -ENOMEM;
Jan Kara2e8fa542013-06-04 14:21:02 -04004028 goto failed_mount4;
4029 }
4030
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004031 /*
Mingming Caodab291a2006-10-11 01:21:01 -07004032 * The jbd2_journal_load will have done any necessary log recovery,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004033 * so we can safely mount the rest of the filesystem now.
4034 */
4035
David Howells1d1fe1e2008-02-07 00:15:37 -08004036 root = ext4_iget(sb, EXT4_ROOT_INO);
4037 if (IS_ERR(root)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004038 ext4_msg(sb, KERN_ERR, "get root inode failed");
David Howells1d1fe1e2008-02-07 00:15:37 -08004039 ret = PTR_ERR(root);
Manish Katiyar32a9bb52011-02-27 20:42:06 -05004040 root = NULL;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004041 goto failed_mount4;
4042 }
4043 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004044 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
Al Viro94bf6082012-01-09 15:53:24 -05004045 iput(root);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004046 goto failed_mount4;
4047 }
Al Viro48fde702012-01-08 22:15:13 -05004048 sb->s_root = d_make_root(root);
David Howells1d1fe1e2008-02-07 00:15:37 -08004049 if (!sb->s_root) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004050 ext4_msg(sb, KERN_ERR, "get root dentry failed");
David Howells1d1fe1e2008-02-07 00:15:37 -08004051 ret = -ENOMEM;
4052 goto failed_mount4;
4053 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004054
Eric Sandeen7e84b622012-05-28 14:17:25 -04004055 if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
4056 sb->s_flags |= MS_RDONLY;
Kalpak Shahef7f3832007-07-18 09:15:20 -04004057
4058 /* determine the minimum size of new large inodes, if present */
4059 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
4060 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4061 EXT4_GOOD_OLD_INODE_SIZE;
4062 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
4063 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
4064 if (sbi->s_want_extra_isize <
4065 le16_to_cpu(es->s_want_extra_isize))
4066 sbi->s_want_extra_isize =
4067 le16_to_cpu(es->s_want_extra_isize);
4068 if (sbi->s_want_extra_isize <
4069 le16_to_cpu(es->s_min_extra_isize))
4070 sbi->s_want_extra_isize =
4071 le16_to_cpu(es->s_min_extra_isize);
4072 }
4073 }
4074 /* Check if enough inode space is available */
4075 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
4076 sbi->s_inode_size) {
4077 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4078 EXT4_GOOD_OLD_INODE_SIZE;
Eric Sandeenb31e1552009-06-04 17:36:36 -04004079 ext4_msg(sb, KERN_INFO, "required extra inode space not"
4080 "available");
Kalpak Shahef7f3832007-07-18 09:15:20 -04004081 }
4082
Jan Kara30fac0f2013-12-08 21:11:59 -05004083 err = ext4_reserve_clusters(sbi, ext4_calculate_resv_clusters(sb));
Lukas Czerner27dd4382013-04-09 22:11:22 -04004084 if (err) {
4085 ext4_msg(sb, KERN_ERR, "failed to reserve %llu clusters for "
Jan Kara30fac0f2013-12-08 21:11:59 -05004086 "reserved pool", ext4_calculate_resv_clusters(sb));
Lukas Czerner27dd4382013-04-09 22:11:22 -04004087 goto failed_mount4a;
4088 }
4089
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04004090 err = ext4_setup_system_zone(sb);
4091 if (err) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004092 ext4_msg(sb, KERN_ERR, "failed to initialize system "
Curt Wohlgemuthfbe845d2010-05-16 13:00:00 -04004093 "zone (%d)", err);
Al Viro94bf6082012-01-09 15:53:24 -05004094 goto failed_mount4a;
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04004095 }
4096
Aneesh Kumar K.Vc2774d82008-10-10 20:07:20 -04004097 ext4_ext_init(sb);
Akira Fujita9d990122012-05-28 14:19:25 -04004098 err = ext4_mb_init(sb);
Aneesh Kumar K.Vc2774d82008-10-10 20:07:20 -04004099 if (err) {
Uwe Kleine-König421f91d2010-06-11 12:17:00 +02004100 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
Eric Sandeenb31e1552009-06-04 17:36:36 -04004101 err);
Tao Madcf2d802011-10-06 12:10:11 -04004102 goto failed_mount5;
Aneesh Kumar K.Vc2774d82008-10-10 20:07:20 -04004103 }
4104
Lukas Czernerbfff6872010-10-27 21:30:05 -04004105 err = ext4_register_li_request(sb, first_not_zeroed);
4106 if (err)
Tao Madcf2d802011-10-06 12:10:11 -04004107 goto failed_mount6;
Lukas Czernerbfff6872010-10-27 21:30:05 -04004108
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04004109 sbi->s_kobj.kset = ext4_kset;
4110 init_completion(&sbi->s_kobj_unregister);
4111 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
4112 "%s", sb->s_id);
Tao Madcf2d802011-10-06 12:10:11 -04004113 if (err)
4114 goto failed_mount7;
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04004115
Jan Kara9b2ff3572013-03-02 18:22:38 -05004116#ifdef CONFIG_QUOTA
4117 /* Enable quota usage during mount. */
4118 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
4119 !(sb->s_flags & MS_RDONLY)) {
4120 err = ext4_enable_quotas(sb);
4121 if (err)
4122 goto failed_mount8;
4123 }
4124#endif /* CONFIG_QUOTA */
4125
Mingming Cao617ba132006-10-11 01:20:53 -07004126 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
4127 ext4_orphan_cleanup(sb, es);
4128 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
Frank Mayhar03901312009-01-07 00:06:22 -05004129 if (needs_recovery) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004130 ext4_msg(sb, KERN_INFO, "recovery complete");
Frank Mayhar03901312009-01-07 00:06:22 -05004131 ext4_mark_recovery_complete(sb, es);
4132 }
4133 if (EXT4_SB(sb)->s_journal) {
4134 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
4135 descr = " journalled data mode";
4136 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
4137 descr = " ordered data mode";
4138 else
4139 descr = " writeback data mode";
4140 } else
4141 descr = "out journal";
4142
Lukas Czerner79add3a2012-11-08 13:28:29 -05004143 if (test_opt(sb, DISCARD)) {
4144 struct request_queue *q = bdev_get_queue(sb->s_bdev);
4145 if (!blk_queue_discard(q))
4146 ext4_msg(sb, KERN_WARNING,
4147 "mounting with \"discard\" option, but "
4148 "the device does not support discard");
4149 }
4150
Curt Wohlgemuthd4c402d2010-05-16 12:00:00 -04004151 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
Theodore Ts'o8b67f042010-08-01 23:14:20 -04004152 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
4153 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004154
Theodore Ts'o66e61a92010-07-27 11:56:04 -04004155 if (es->s_error_count)
4156 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004157
Theodore Ts'oefbed4d2013-10-17 21:11:01 -04004158 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
4159 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
4160 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
4161 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
4162
Curt Wohlgemuthd4c402d2010-05-16 12:00:00 -04004163 kfree(orig_data);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004164 return 0;
4165
Mingming Cao617ba132006-10-11 01:20:53 -07004166cantfind_ext4:
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004167 if (!silent)
Eric Sandeenb31e1552009-06-04 17:36:36 -04004168 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004169 goto failed_mount;
4170
Theodore Ts'o72ba7452013-01-24 23:24:54 -05004171#ifdef CONFIG_QUOTA
4172failed_mount8:
4173 kobject_del(&sbi->s_kobj);
4174#endif
Tao Madcf2d802011-10-06 12:10:11 -04004175failed_mount7:
4176 ext4_unregister_li_request(sb);
4177failed_mount6:
Tao Madcf2d802011-10-06 12:10:11 -04004178 ext4_mb_release(sb);
Al Viro94bf6082012-01-09 15:53:24 -05004179failed_mount5:
4180 ext4_ext_release(sb);
Tao Madcf2d802011-10-06 12:10:11 -04004181 ext4_release_system_zone(sb);
Al Viro94bf6082012-01-09 15:53:24 -05004182failed_mount4a:
4183 dput(sb->s_root);
Manish Katiyar32a9bb52011-02-27 20:42:06 -05004184 sb->s_root = NULL;
Al Viro94bf6082012-01-09 15:53:24 -05004185failed_mount4:
Eric Sandeenb31e1552009-06-04 17:36:36 -04004186 ext4_msg(sb, KERN_ERR, "mount failed");
Jan Kara2e8fa542013-06-04 14:21:02 -04004187 if (EXT4_SB(sb)->rsv_conversion_wq)
4188 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
Mingming Cao4c0425f2009-09-28 15:48:41 -04004189failed_mount_wq:
Frank Mayhar03901312009-01-07 00:06:22 -05004190 if (sbi->s_journal) {
4191 jbd2_journal_destroy(sbi->s_journal);
4192 sbi->s_journal = NULL;
4193 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004194failed_mount3:
Zheng Liud3922a72013-07-01 08:12:37 -04004195 ext4_es_unregister_shrinker(sbi);
Al Viro9105bb12013-12-08 20:52:31 -05004196 del_timer_sync(&sbi->s_err_report);
Theodore Ts'o9933fc02011-08-01 08:45:02 -04004197 if (sbi->s_flex_groups)
4198 ext4_kvfree(sbi->s_flex_groups);
Theodore Ts'o57042652011-09-09 18:56:51 -04004199 percpu_counter_destroy(&sbi->s_freeclusters_counter);
Theodore Ts'oce7e0102010-11-03 12:03:21 -04004200 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4201 percpu_counter_destroy(&sbi->s_dirs_counter);
Theodore Ts'o57042652011-09-09 18:56:51 -04004202 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
Theodore Ts'o1ac64662013-03-02 10:27:46 -05004203 percpu_counter_destroy(&sbi->s_extent_cache_cnt);
Johann Lombardic5e06d12011-05-24 18:31:25 -04004204 if (sbi->s_mmp_tsk)
4205 kthread_stop(sbi->s_mmp_tsk);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004206failed_mount2:
4207 for (i = 0; i < db_count; i++)
4208 brelse(sbi->s_group_desc[i]);
Theodore Ts'of18a5f22011-08-01 08:45:38 -04004209 ext4_kvfree(sbi->s_group_desc);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004210failed_mount:
Darrick J. Wong04419842012-04-29 18:27:10 -04004211 if (sbi->s_chksum_driver)
4212 crypto_free_shash(sbi->s_chksum_driver);
Theodore Ts'o240799c2008-10-09 23:53:47 -04004213 if (sbi->s_proc) {
Theodore Ts'o66acdcf2012-03-04 20:21:38 -05004214 remove_proc_entry("options", sbi->s_proc);
Theodore Ts'o9f6200b2008-09-23 09:18:24 -04004215 remove_proc_entry(sb->s_id, ext4_proc_root);
Theodore Ts'o240799c2008-10-09 23:53:47 -04004216 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004217#ifdef CONFIG_QUOTA
4218 for (i = 0; i < MAXQUOTAS; i++)
4219 kfree(sbi->s_qf_names[i]);
4220#endif
Mingming Cao617ba132006-10-11 01:20:53 -07004221 ext4_blkdev_remove(sbi);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004222 brelse(bh);
4223out_fail:
4224 sb->s_fs_info = NULL;
Manish Katiyarf6830162009-05-17 23:52:44 -04004225 kfree(sbi->s_blockgroup_lock);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004226 kfree(sbi);
Cyrill Gorcunovdcc7dae2010-07-27 11:56:07 -04004227out_free_orig:
Curt Wohlgemuthd4c402d2010-05-16 12:00:00 -04004228 kfree(orig_data);
Lukas Czerner07aa2ea2012-11-08 15:16:54 -05004229 return err ? err : ret;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004230}
4231
4232/*
4233 * Setup any per-fs journal parameters now. We'll do this both on
4234 * initial mount, once the journal has been initialised but before we've
4235 * done any recovery; and again on any subsequent remount.
4236 */
Mingming Cao617ba132006-10-11 01:20:53 -07004237static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004238{
Mingming Cao617ba132006-10-11 01:20:53 -07004239 struct ext4_sb_info *sbi = EXT4_SB(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004240
Theodore Ts'o30773842009-01-03 20:27:38 -05004241 journal->j_commit_interval = sbi->s_commit_interval;
4242 journal->j_min_batch_time = sbi->s_min_batch_time;
4243 journal->j_max_batch_time = sbi->s_max_batch_time;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004244
Theodore Ts'oa931da62010-08-03 21:35:12 -04004245 write_lock(&journal->j_state_lock);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004246 if (test_opt(sb, BARRIER))
Mingming Caodab291a2006-10-11 01:21:01 -07004247 journal->j_flags |= JBD2_BARRIER;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004248 else
Mingming Caodab291a2006-10-11 01:21:01 -07004249 journal->j_flags &= ~JBD2_BARRIER;
Hidehiro Kawai5bf56832008-10-10 22:12:43 -04004250 if (test_opt(sb, DATA_ERR_ABORT))
4251 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4252 else
4253 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
Theodore Ts'oa931da62010-08-03 21:35:12 -04004254 write_unlock(&journal->j_state_lock);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004255}
4256
Mingming Cao617ba132006-10-11 01:20:53 -07004257static journal_t *ext4_get_journal(struct super_block *sb,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004258 unsigned int journal_inum)
4259{
4260 struct inode *journal_inode;
4261 journal_t *journal;
4262
Frank Mayhar03901312009-01-07 00:06:22 -05004263 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4264
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004265 /* First, test for the existence of a valid inode on disk. Bad
4266 * things happen if we iget() an unused inode, as the subsequent
4267 * iput() will try to delete it. */
4268
David Howells1d1fe1e2008-02-07 00:15:37 -08004269 journal_inode = ext4_iget(sb, journal_inum);
4270 if (IS_ERR(journal_inode)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004271 ext4_msg(sb, KERN_ERR, "no journal found");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004272 return NULL;
4273 }
4274 if (!journal_inode->i_nlink) {
4275 make_bad_inode(journal_inode);
4276 iput(journal_inode);
Eric Sandeenb31e1552009-06-04 17:36:36 -04004277 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004278 return NULL;
4279 }
4280
Theodore Ts'oe5f8eab82008-09-08 22:25:04 -04004281 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004282 journal_inode, journal_inode->i_size);
David Howells1d1fe1e2008-02-07 00:15:37 -08004283 if (!S_ISREG(journal_inode->i_mode)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004284 ext4_msg(sb, KERN_ERR, "invalid journal inode");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004285 iput(journal_inode);
4286 return NULL;
4287 }
4288
Mingming Caodab291a2006-10-11 01:21:01 -07004289 journal = jbd2_journal_init_inode(journal_inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004290 if (!journal) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004291 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004292 iput(journal_inode);
4293 return NULL;
4294 }
4295 journal->j_private = sb;
Mingming Cao617ba132006-10-11 01:20:53 -07004296 ext4_init_journal_params(sb, journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004297 return journal;
4298}
4299
Mingming Cao617ba132006-10-11 01:20:53 -07004300static journal_t *ext4_get_dev_journal(struct super_block *sb,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004301 dev_t j_dev)
4302{
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04004303 struct buffer_head *bh;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004304 journal_t *journal;
Mingming Cao617ba132006-10-11 01:20:53 -07004305 ext4_fsblk_t start;
4306 ext4_fsblk_t len;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004307 int hblock, blocksize;
Mingming Cao617ba132006-10-11 01:20:53 -07004308 ext4_fsblk_t sb_block;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004309 unsigned long offset;
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04004310 struct ext4_super_block *es;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004311 struct block_device *bdev;
4312
Frank Mayhar03901312009-01-07 00:06:22 -05004313 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4314
Eric Sandeenb31e1552009-06-04 17:36:36 -04004315 bdev = ext4_blkdev_get(j_dev, sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004316 if (bdev == NULL)
4317 return NULL;
4318
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004319 blocksize = sb->s_blocksize;
Martin K. Petersene1defc42009-05-22 17:17:49 -04004320 hblock = bdev_logical_block_size(bdev);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004321 if (blocksize < hblock) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004322 ext4_msg(sb, KERN_ERR,
4323 "blocksize too small for journal device");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004324 goto out_bdev;
4325 }
4326
Mingming Cao617ba132006-10-11 01:20:53 -07004327 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4328 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004329 set_blocksize(bdev, blocksize);
4330 if (!(bh = __bread(bdev, sb_block, blocksize))) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004331 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4332 "external journal");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004333 goto out_bdev;
4334 }
4335
Theodore Ts'o2716b802012-05-28 17:47:52 -04004336 es = (struct ext4_super_block *) (bh->b_data + offset);
Mingming Cao617ba132006-10-11 01:20:53 -07004337 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004338 !(le32_to_cpu(es->s_feature_incompat) &
Mingming Cao617ba132006-10-11 01:20:53 -07004339 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004340 ext4_msg(sb, KERN_ERR, "external journal has "
4341 "bad superblock");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004342 brelse(bh);
4343 goto out_bdev;
4344 }
4345
Mingming Cao617ba132006-10-11 01:20:53 -07004346 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004347 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004348 brelse(bh);
4349 goto out_bdev;
4350 }
4351
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07004352 len = ext4_blocks_count(es);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004353 start = sb_block + 1;
4354 brelse(bh); /* we're done with the superblock */
4355
Mingming Caodab291a2006-10-11 01:21:01 -07004356 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004357 start, len, blocksize);
4358 if (!journal) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004359 ext4_msg(sb, KERN_ERR, "failed to create device journal");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004360 goto out_bdev;
4361 }
4362 journal->j_private = sb;
Theodore Ts'o9f203502013-04-20 15:46:17 -04004363 ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004364 wait_on_buffer(journal->j_sb_buffer);
4365 if (!buffer_uptodate(journal->j_sb_buffer)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004366 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004367 goto out_journal;
4368 }
4369 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004370 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4371 "user (unsupported) - %d",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004372 be32_to_cpu(journal->j_superblock->s_nr_users));
4373 goto out_journal;
4374 }
Mingming Cao617ba132006-10-11 01:20:53 -07004375 EXT4_SB(sb)->journal_bdev = bdev;
4376 ext4_init_journal_params(sb, journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004377 return journal;
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04004378
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004379out_journal:
Mingming Caodab291a2006-10-11 01:21:01 -07004380 jbd2_journal_destroy(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004381out_bdev:
Mingming Cao617ba132006-10-11 01:20:53 -07004382 ext4_blkdev_put(bdev);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004383 return NULL;
4384}
4385
Mingming Cao617ba132006-10-11 01:20:53 -07004386static int ext4_load_journal(struct super_block *sb,
4387 struct ext4_super_block *es,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004388 unsigned long journal_devnum)
4389{
4390 journal_t *journal;
4391 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4392 dev_t journal_dev;
4393 int err = 0;
4394 int really_read_only;
4395
Frank Mayhar03901312009-01-07 00:06:22 -05004396 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4397
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004398 if (journal_devnum &&
4399 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004400 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4401 "numbers have changed");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004402 journal_dev = new_decode_dev(journal_devnum);
4403 } else
4404 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4405
4406 really_read_only = bdev_read_only(sb->s_bdev);
4407
4408 /*
4409 * Are we loading a blank journal or performing recovery after a
4410 * crash? For recovery, we need to check in advance whether we
4411 * can get read-write access to the device.
4412 */
Mingming Cao617ba132006-10-11 01:20:53 -07004413 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004414 if (sb->s_flags & MS_RDONLY) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004415 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4416 "required on readonly filesystem");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004417 if (really_read_only) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004418 ext4_msg(sb, KERN_ERR, "write access "
4419 "unavailable, cannot proceed");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004420 return -EROFS;
4421 }
Eric Sandeenb31e1552009-06-04 17:36:36 -04004422 ext4_msg(sb, KERN_INFO, "write access will "
4423 "be enabled during recovery");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004424 }
4425 }
4426
4427 if (journal_inum && journal_dev) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004428 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4429 "and inode journals!");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004430 return -EINVAL;
4431 }
4432
4433 if (journal_inum) {
Mingming Cao617ba132006-10-11 01:20:53 -07004434 if (!(journal = ext4_get_journal(sb, journal_inum)))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004435 return -EINVAL;
4436 } else {
Mingming Cao617ba132006-10-11 01:20:53 -07004437 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004438 return -EINVAL;
4439 }
4440
Theodore Ts'o90576c02009-09-29 15:51:30 -04004441 if (!(journal->j_flags & JBD2_BARRIER))
Eric Sandeenb31e1552009-06-04 17:36:36 -04004442 ext4_msg(sb, KERN_INFO, "barriers disabled");
Theodore Ts'o4776004f2008-09-08 23:00:52 -04004443
Mingming Cao617ba132006-10-11 01:20:53 -07004444 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
Mingming Caodab291a2006-10-11 01:21:01 -07004445 err = jbd2_journal_wipe(journal, !really_read_only);
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -04004446 if (!err) {
4447 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4448 if (save)
4449 memcpy(save, ((char *) es) +
4450 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
Mingming Caodab291a2006-10-11 01:21:01 -07004451 err = jbd2_journal_load(journal);
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -04004452 if (save)
4453 memcpy(((char *) es) + EXT4_S_ERR_START,
4454 save, EXT4_S_ERR_LEN);
4455 kfree(save);
4456 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004457
4458 if (err) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004459 ext4_msg(sb, KERN_ERR, "error loading journal");
Mingming Caodab291a2006-10-11 01:21:01 -07004460 jbd2_journal_destroy(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004461 return err;
4462 }
4463
Mingming Cao617ba132006-10-11 01:20:53 -07004464 EXT4_SB(sb)->s_journal = journal;
4465 ext4_clear_journal_err(sb, es);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004466
Maciej Żenczykowskic41303c2010-10-27 21:30:06 -04004467 if (!really_read_only && journal_devnum &&
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004468 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4469 es->s_journal_dev = cpu_to_le32(journal_devnum);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004470
4471 /* Make sure we flush the recovery flag to disk. */
Theodore Ts'oe2d67052009-05-01 00:33:44 -04004472 ext4_commit_super(sb, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004473 }
4474
4475 return 0;
4476}
4477
Theodore Ts'oe2d67052009-05-01 00:33:44 -04004478static int ext4_commit_super(struct super_block *sb, int sync)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004479{
Theodore Ts'oe2d67052009-05-01 00:33:44 -04004480 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
Mingming Cao617ba132006-10-11 01:20:53 -07004481 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
Takashi Satoc4be0c12009-01-09 16:40:58 -08004482 int error = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004483
Theodore Ts'o7c2e7082011-09-09 18:28:51 -04004484 if (!sbh || block_device_ejected(sb))
Takashi Satoc4be0c12009-01-09 16:40:58 -08004485 return error;
Theodore Ts'o914258b2008-10-06 21:35:40 -04004486 if (buffer_write_io_error(sbh)) {
4487 /*
4488 * Oh, dear. A previous attempt to write the
4489 * superblock failed. This could happen because the
4490 * USB device was yanked out. Or it could happen to
4491 * be a transient write error and maybe the block will
4492 * be remapped. Nothing we can do but to retry the
4493 * write and hope for the best.
4494 */
Eric Sandeenb31e1552009-06-04 17:36:36 -04004495 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4496 "superblock detected");
Theodore Ts'o914258b2008-10-06 21:35:40 -04004497 clear_buffer_write_io_error(sbh);
4498 set_buffer_uptodate(sbh);
4499 }
Theodore Ts'o71290b32009-09-10 17:31:04 -04004500 /*
4501 * If the file system is mounted read-only, don't update the
4502 * superblock write time. This avoids updating the superblock
4503 * write time when we are mounting the root file system
4504 * read/only but we need to replay the journal; at that point,
4505 * for people who are east of GMT and who make their clock
4506 * tick in localtime for Windows bug-for-bug compatibility,
4507 * the clock is set in the future, and this will cause e2fsck
4508 * to complain and force a full file system check.
4509 */
4510 if (!(sb->s_flags & MS_RDONLY))
4511 es->s_wtime = cpu_to_le32(get_seconds());
Theodore Ts'of613dfc2010-07-27 11:56:08 -04004512 if (sb->s_bdev->bd_part)
4513 es->s_kbytes_written =
4514 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
Theodore Ts'oafc32f72009-02-28 19:39:58 -05004515 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4516 EXT4_SB(sb)->s_sectors_written_start) >> 1));
Theodore Ts'of613dfc2010-07-27 11:56:08 -04004517 else
4518 es->s_kbytes_written =
4519 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
Theodore Ts'o57042652011-09-09 18:56:51 -04004520 ext4_free_blocks_count_set(es,
4521 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4522 &EXT4_SB(sb)->s_freeclusters_counter)));
Theodore Ts'oce7e0102010-11-03 12:03:21 -04004523 es->s_free_inodes_count =
4524 cpu_to_le32(percpu_counter_sum_positive(
4525 &EXT4_SB(sb)->s_freeinodes_counter));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004526 BUFFER_TRACE(sbh, "marking dirty");
Theodore Ts'o06db49e2012-10-10 01:06:58 -04004527 ext4_superblock_csum_set(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004528 mark_buffer_dirty(sbh);
Theodore Ts'o914258b2008-10-06 21:35:40 -04004529 if (sync) {
Takashi Satoc4be0c12009-01-09 16:40:58 -08004530 error = sync_dirty_buffer(sbh);
4531 if (error)
4532 return error;
4533
4534 error = buffer_write_io_error(sbh);
4535 if (error) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004536 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4537 "superblock");
Theodore Ts'o914258b2008-10-06 21:35:40 -04004538 clear_buffer_write_io_error(sbh);
4539 set_buffer_uptodate(sbh);
4540 }
4541 }
Takashi Satoc4be0c12009-01-09 16:40:58 -08004542 return error;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004543}
4544
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004545/*
4546 * Have we just finished recovery? If so, and if we are mounting (or
4547 * remounting) the filesystem readonly, then we will end up with a
4548 * consistent fs on disk. Record that fact.
4549 */
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04004550static void ext4_mark_recovery_complete(struct super_block *sb,
4551 struct ext4_super_block *es)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004552{
Mingming Cao617ba132006-10-11 01:20:53 -07004553 journal_t *journal = EXT4_SB(sb)->s_journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004554
Frank Mayhar03901312009-01-07 00:06:22 -05004555 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4556 BUG_ON(journal != NULL);
4557 return;
4558 }
Mingming Caodab291a2006-10-11 01:21:01 -07004559 jbd2_journal_lock_updates(journal);
Hidehiro Kawai7ffe1ea2008-10-10 20:29:21 -04004560 if (jbd2_journal_flush(journal) < 0)
4561 goto out;
4562
Mingming Cao617ba132006-10-11 01:20:53 -07004563 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004564 sb->s_flags & MS_RDONLY) {
Mingming Cao617ba132006-10-11 01:20:53 -07004565 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
Theodore Ts'oe2d67052009-05-01 00:33:44 -04004566 ext4_commit_super(sb, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004567 }
Hidehiro Kawai7ffe1ea2008-10-10 20:29:21 -04004568
4569out:
Mingming Caodab291a2006-10-11 01:21:01 -07004570 jbd2_journal_unlock_updates(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004571}
4572
4573/*
4574 * If we are mounting (or read-write remounting) a filesystem whose journal
4575 * has recorded an error from a previous lifetime, move that error to the
4576 * main filesystem now.
4577 */
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04004578static void ext4_clear_journal_err(struct super_block *sb,
4579 struct ext4_super_block *es)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004580{
4581 journal_t *journal;
4582 int j_errno;
4583 const char *errstr;
4584
Frank Mayhar03901312009-01-07 00:06:22 -05004585 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4586
Mingming Cao617ba132006-10-11 01:20:53 -07004587 journal = EXT4_SB(sb)->s_journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004588
4589 /*
4590 * Now check for any error status which may have been recorded in the
Mingming Cao617ba132006-10-11 01:20:53 -07004591 * journal by a prior ext4_error() or ext4_abort()
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004592 */
4593
Mingming Caodab291a2006-10-11 01:21:01 -07004594 j_errno = jbd2_journal_errno(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004595 if (j_errno) {
4596 char nbuf[16];
4597
Mingming Cao617ba132006-10-11 01:20:53 -07004598 errstr = ext4_decode_error(sb, j_errno, nbuf);
Eric Sandeen12062dd2010-02-15 14:19:27 -05004599 ext4_warning(sb, "Filesystem error recorded "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004600 "from previous mount: %s", errstr);
Eric Sandeen12062dd2010-02-15 14:19:27 -05004601 ext4_warning(sb, "Marking fs in need of filesystem check.");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004602
Mingming Cao617ba132006-10-11 01:20:53 -07004603 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4604 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
Theodore Ts'oe2d67052009-05-01 00:33:44 -04004605 ext4_commit_super(sb, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004606
Mingming Caodab291a2006-10-11 01:21:01 -07004607 jbd2_journal_clear_err(journal);
Theodore Ts'od796c522012-08-05 19:04:57 -04004608 jbd2_journal_update_sb_errno(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004609 }
4610}
4611
4612/*
4613 * Force the running and committing transactions to commit,
4614 * and wait on the commit.
4615 */
Mingming Cao617ba132006-10-11 01:20:53 -07004616int ext4_force_commit(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004617{
4618 journal_t *journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004619
4620 if (sb->s_flags & MS_RDONLY)
4621 return 0;
4622
Mingming Cao617ba132006-10-11 01:20:53 -07004623 journal = EXT4_SB(sb)->s_journal;
Guo Chaob1deefc2013-01-28 21:41:02 -05004624 return ext4_journal_force_commit(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004625}
4626
Mingming Cao617ba132006-10-11 01:20:53 -07004627static int ext4_sync_fs(struct super_block *sb, int wait)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004628{
Theodore Ts'o14ce0cb2008-11-03 18:10:55 -05004629 int ret = 0;
Jan Kara9eddacf2009-02-10 06:46:05 -05004630 tid_t target;
Dmitry Monakhov06a407f2013-06-12 22:25:07 -04004631 bool needs_barrier = false;
Mingming Cao8d5d02e2009-09-28 15:48:29 -04004632 struct ext4_sb_info *sbi = EXT4_SB(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004633
Theodore Ts'o9bffad12009-06-17 11:48:11 -04004634 trace_ext4_sync_fs(sb, wait);
Jan Kara2e8fa542013-06-04 14:21:02 -04004635 flush_workqueue(sbi->rsv_conversion_wq);
Jan Karaa1177822012-07-03 16:45:29 +02004636 /*
4637 * Writeback quota in non-journalled quota case - journalled quota has
4638 * no dirty dquots
4639 */
4640 dquot_writeback_dquots(sb, -1);
Dmitry Monakhov06a407f2013-06-12 22:25:07 -04004641 /*
4642 * Data writeback is possible w/o journal transaction, so barrier must
4643 * being sent at the end of the function. But we can skip it if
4644 * transaction_commit will do it for us.
4645 */
4646 target = jbd2_get_latest_transaction(sbi->s_journal);
4647 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
4648 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
4649 needs_barrier = true;
4650
Mingming Cao8d5d02e2009-09-28 15:48:29 -04004651 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
Theodore Ts'o9ca92382009-05-01 12:52:25 -04004652 if (wait)
Dmitry Monakhov06a407f2013-06-12 22:25:07 -04004653 ret = jbd2_log_wait_commit(sbi->s_journal, target);
Frank Mayhar03901312009-01-07 00:06:22 -05004654 }
Dmitry Monakhov06a407f2013-06-12 22:25:07 -04004655 if (needs_barrier) {
4656 int err;
4657 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
4658 if (!ret)
4659 ret = err;
4660 }
4661
4662 return ret;
4663}
4664
4665static int ext4_sync_fs_nojournal(struct super_block *sb, int wait)
4666{
4667 int ret = 0;
4668
4669 trace_ext4_sync_fs(sb, wait);
4670 flush_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
Dmitry Monakhov06a407f2013-06-12 22:25:07 -04004671 dquot_writeback_dquots(sb, -1);
4672 if (wait && test_opt(sb, BARRIER))
4673 ret = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
4674
Theodore Ts'o14ce0cb2008-11-03 18:10:55 -05004675 return ret;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004676}
4677
4678/*
4679 * LVM calls this function before a (read-only) snapshot is created. This
4680 * gives us a chance to flush the journal completely and mark the fs clean.
Yongqiang Yangbe4f27d2011-04-10 22:06:07 -04004681 *
4682 * Note that only this function cannot bring a filesystem to be in a clean
Jan Kara8e8ad8a2012-06-12 16:20:38 +02004683 * state independently. It relies on upper layer to stop all data & metadata
4684 * modifications.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004685 */
Takashi Satoc4be0c12009-01-09 16:40:58 -08004686static int ext4_freeze(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004687{
Takashi Satoc4be0c12009-01-09 16:40:58 -08004688 int error = 0;
4689 journal_t *journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004690
Theodore Ts'o9ca92382009-05-01 12:52:25 -04004691 if (sb->s_flags & MS_RDONLY)
4692 return 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004693
Theodore Ts'o9ca92382009-05-01 12:52:25 -04004694 journal = EXT4_SB(sb)->s_journal;
Hidehiro Kawai7ffe1ea2008-10-10 20:29:21 -04004695
Theodore Ts'o9ca92382009-05-01 12:52:25 -04004696 /* Now we set up the journal barrier. */
4697 jbd2_journal_lock_updates(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004698
Theodore Ts'o9ca92382009-05-01 12:52:25 -04004699 /*
4700 * Don't clear the needs_recovery flag if we failed to flush
4701 * the journal.
4702 */
4703 error = jbd2_journal_flush(journal);
Eric Sandeen6b0310f2010-05-16 02:00:00 -04004704 if (error < 0)
4705 goto out;
Theodore Ts'o9ca92382009-05-01 12:52:25 -04004706
4707 /* Journal blocked and flushed, clear needs_recovery flag. */
4708 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4709 error = ext4_commit_super(sb, 1);
Eric Sandeen6b0310f2010-05-16 02:00:00 -04004710out:
Jan Kara8e8ad8a2012-06-12 16:20:38 +02004711 /* we rely on upper layer to stop further updates */
Eric Sandeen6b0310f2010-05-16 02:00:00 -04004712 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4713 return error;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004714}
4715
4716/*
4717 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4718 * flag here, even though the filesystem is not technically dirty yet.
4719 */
Takashi Satoc4be0c12009-01-09 16:40:58 -08004720static int ext4_unfreeze(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004721{
Theodore Ts'o9ca92382009-05-01 12:52:25 -04004722 if (sb->s_flags & MS_RDONLY)
4723 return 0;
4724
Theodore Ts'o9ca92382009-05-01 12:52:25 -04004725 /* Reset the needs_recovery flag before the fs is unlocked. */
4726 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4727 ext4_commit_super(sb, 1);
Takashi Satoc4be0c12009-01-09 16:40:58 -08004728 return 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004729}
4730
Theodore Ts'o673c6102010-12-15 20:28:48 -05004731/*
4732 * Structure to save mount options for ext4_remount's benefit
4733 */
4734struct ext4_mount_options {
4735 unsigned long s_mount_opt;
Theodore Ts'oa2595b82010-12-15 20:30:48 -05004736 unsigned long s_mount_opt2;
Eric W. Biederman08cefc72012-02-07 15:41:49 -08004737 kuid_t s_resuid;
4738 kgid_t s_resgid;
Theodore Ts'o673c6102010-12-15 20:28:48 -05004739 unsigned long s_commit_interval;
4740 u32 s_min_batch_time, s_max_batch_time;
4741#ifdef CONFIG_QUOTA
4742 int s_jquota_fmt;
4743 char *s_qf_names[MAXQUOTAS];
4744#endif
4745};
4746
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04004747static int ext4_remount(struct super_block *sb, int *flags, char *data)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004748{
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04004749 struct ext4_super_block *es;
Mingming Cao617ba132006-10-11 01:20:53 -07004750 struct ext4_sb_info *sbi = EXT4_SB(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004751 unsigned long old_sb_flags;
Mingming Cao617ba132006-10-11 01:20:53 -07004752 struct ext4_mount_options old_opts;
Christoph Hellwigc79d9672010-05-19 07:16:40 -04004753 int enable_quota = 0;
Theodore Ts'o8a266462008-07-26 14:34:21 -04004754 ext4_group_t g;
Theodore Ts'ob3881f72009-01-05 22:46:26 -05004755 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
Johann Lombardic5e06d12011-05-24 18:31:25 -04004756 int err = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004757#ifdef CONFIG_QUOTA
Chen Gang03dafb52013-01-24 23:24:58 -05004758 int i, j;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004759#endif
Curt Wohlgemuthd4c402d2010-05-16 12:00:00 -04004760 char *orig_data = kstrdup(data, GFP_KERNEL);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004761
4762 /* Store the original options */
4763 old_sb_flags = sb->s_flags;
4764 old_opts.s_mount_opt = sbi->s_mount_opt;
Theodore Ts'oa2595b82010-12-15 20:30:48 -05004765 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004766 old_opts.s_resuid = sbi->s_resuid;
4767 old_opts.s_resgid = sbi->s_resgid;
4768 old_opts.s_commit_interval = sbi->s_commit_interval;
Theodore Ts'o30773842009-01-03 20:27:38 -05004769 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4770 old_opts.s_max_batch_time = sbi->s_max_batch_time;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004771#ifdef CONFIG_QUOTA
4772 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
4773 for (i = 0; i < MAXQUOTAS; i++)
Chen Gang03dafb52013-01-24 23:24:58 -05004774 if (sbi->s_qf_names[i]) {
4775 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
4776 GFP_KERNEL);
4777 if (!old_opts.s_qf_names[i]) {
4778 for (j = 0; j < i; j++)
4779 kfree(old_opts.s_qf_names[j]);
Wei Yongjun3e36a162013-03-02 17:13:55 -05004780 kfree(orig_data);
Chen Gang03dafb52013-01-24 23:24:58 -05004781 return -ENOMEM;
4782 }
4783 } else
4784 old_opts.s_qf_names[i] = NULL;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004785#endif
Theodore Ts'ob3881f72009-01-05 22:46:26 -05004786 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4787 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004788
4789 /*
4790 * Allow the "check" option to be passed as a remount option.
4791 */
Eric Sandeen661aa522012-02-20 17:53:04 -05004792 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004793 err = -EINVAL;
4794 goto restore_opts;
4795 }
4796
Piotr Sarna6ae65142013-08-08 23:02:24 -04004797 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
4798 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
4799 ext4_msg(sb, KERN_ERR, "can't mount with "
4800 "both data=journal and delalloc");
4801 err = -EINVAL;
4802 goto restore_opts;
4803 }
4804 if (test_opt(sb, DIOREAD_NOLOCK)) {
4805 ext4_msg(sb, KERN_ERR, "can't mount with "
4806 "both data=journal and dioread_nolock");
4807 err = -EINVAL;
4808 goto restore_opts;
4809 }
4810 }
4811
Theodore Ts'o4ab2f152009-06-13 10:09:36 -04004812 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
Theodore Ts'oc67d8592010-06-29 11:07:07 -04004813 ext4_abort(sb, "Abort forced by user");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004814
4815 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
Dmitry Monakhov482a7422010-02-24 11:35:32 -05004816 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004817
4818 es = sbi->s_es;
4819
Theodore Ts'ob3881f72009-01-05 22:46:26 -05004820 if (sbi->s_journal) {
Frank Mayhar03901312009-01-07 00:06:22 -05004821 ext4_init_journal_params(sb, sbi->s_journal);
Theodore Ts'ob3881f72009-01-05 22:46:26 -05004822 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4823 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004824
Eric Sandeen661aa522012-02-20 17:53:04 -05004825 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
Theodore Ts'o4ab2f152009-06-13 10:09:36 -04004826 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004827 err = -EROFS;
4828 goto restore_opts;
4829 }
4830
4831 if (*flags & MS_RDONLY) {
Christoph Hellwig0f0dd622010-05-19 07:16:41 -04004832 err = dquot_suspend(sb, -1);
4833 if (err < 0)
Christoph Hellwigc79d9672010-05-19 07:16:40 -04004834 goto restore_opts;
Christoph Hellwigc79d9672010-05-19 07:16:40 -04004835
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004836 /*
4837 * First of all, the unconditional stuff we have to do
4838 * to disable replay of the journal when we next remount
4839 */
4840 sb->s_flags |= MS_RDONLY;
4841
4842 /*
4843 * OK, test if we are remounting a valid rw partition
4844 * readonly, and if so set the rdonly flag and then
4845 * mark the partition as valid again.
4846 */
Mingming Cao617ba132006-10-11 01:20:53 -07004847 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4848 (sbi->s_mount_state & EXT4_VALID_FS))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004849 es->s_state = cpu_to_le16(sbi->s_mount_state);
4850
Theodore Ts'oa63c9eb2009-05-01 01:59:42 -04004851 if (sbi->s_journal)
Frank Mayhar03901312009-01-07 00:06:22 -05004852 ext4_mark_recovery_complete(sb, es);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004853 } else {
Eric Sandeena13fb1a2009-08-18 00:20:23 -04004854 /* Make sure we can mount this feature set readwrite */
4855 if (!ext4_feature_set_ok(sb, 0)) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004856 err = -EROFS;
4857 goto restore_opts;
4858 }
Eric Sandeenead65962007-02-10 01:46:08 -08004859 /*
Theodore Ts'o8a266462008-07-26 14:34:21 -04004860 * Make sure the group descriptor checksums
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04004861 * are sane. If they aren't, refuse to remount r/w.
Theodore Ts'o8a266462008-07-26 14:34:21 -04004862 */
4863 for (g = 0; g < sbi->s_groups_count; g++) {
4864 struct ext4_group_desc *gdp =
4865 ext4_get_group_desc(sb, g, NULL);
4866
Darrick J. Wongfeb0ab32012-04-29 18:45:10 -04004867 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004868 ext4_msg(sb, KERN_ERR,
4869 "ext4_remount: Checksum for group %u failed (%u!=%u)",
Theodore Ts'o8a266462008-07-26 14:34:21 -04004870 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4871 le16_to_cpu(gdp->bg_checksum));
4872 err = -EINVAL;
4873 goto restore_opts;
4874 }
4875 }
4876
4877 /*
Eric Sandeenead65962007-02-10 01:46:08 -08004878 * If we have an unprocessed orphan list hanging
4879 * around from a previously readonly bdev mount,
4880 * require a full umount/remount for now.
4881 */
4882 if (es->s_last_orphan) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004883 ext4_msg(sb, KERN_WARNING, "Couldn't "
Eric Sandeenead65962007-02-10 01:46:08 -08004884 "remount RDWR because of unprocessed "
4885 "orphan inode list. Please "
Eric Sandeenb31e1552009-06-04 17:36:36 -04004886 "umount/remount instead");
Eric Sandeenead65962007-02-10 01:46:08 -08004887 err = -EINVAL;
4888 goto restore_opts;
4889 }
4890
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004891 /*
4892 * Mounting a RDONLY partition read-write, so reread
4893 * and store the current valid flag. (It may have
4894 * been changed by e2fsck since we originally mounted
4895 * the partition.)
4896 */
Frank Mayhar03901312009-01-07 00:06:22 -05004897 if (sbi->s_journal)
4898 ext4_clear_journal_err(sb, es);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004899 sbi->s_mount_state = le16_to_cpu(es->s_state);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04004900 if (!ext4_setup_super(sb, es, 0))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004901 sb->s_flags &= ~MS_RDONLY;
Johann Lombardic5e06d12011-05-24 18:31:25 -04004902 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
4903 EXT4_FEATURE_INCOMPAT_MMP))
4904 if (ext4_multi_mount_protect(sb,
4905 le64_to_cpu(es->s_mmp_block))) {
4906 err = -EROFS;
4907 goto restore_opts;
4908 }
Christoph Hellwigc79d9672010-05-19 07:16:40 -04004909 enable_quota = 1;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004910 }
4911 }
Lukas Czernerbfff6872010-10-27 21:30:05 -04004912
4913 /*
4914 * Reinitialize lazy itable initialization thread based on
4915 * current settings
4916 */
4917 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4918 ext4_unregister_li_request(sb);
4919 else {
4920 ext4_group_t first_not_zeroed;
4921 first_not_zeroed = ext4_has_uninit_itable(sb);
4922 ext4_register_li_request(sb, first_not_zeroed);
4923 }
4924
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04004925 ext4_setup_system_zone(sb);
Michael Tokarevd096ad02012-12-25 14:08:16 -05004926 if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
Theodore Ts'oe2d67052009-05-01 00:33:44 -04004927 ext4_commit_super(sb, 1);
Frank Mayhar03901312009-01-07 00:06:22 -05004928
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004929#ifdef CONFIG_QUOTA
4930 /* Release old quota file names */
4931 for (i = 0; i < MAXQUOTAS; i++)
Chen Gang03dafb52013-01-24 23:24:58 -05004932 kfree(old_opts.s_qf_names[i]);
Aditya Kali7c319d32012-07-22 20:21:31 -04004933 if (enable_quota) {
4934 if (sb_any_quota_suspended(sb))
4935 dquot_resume(sb, -1);
4936 else if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
4937 EXT4_FEATURE_RO_COMPAT_QUOTA)) {
4938 err = ext4_enable_quotas(sb);
Theodore Ts'o07724f92012-08-17 19:08:42 -04004939 if (err)
Aditya Kali7c319d32012-07-22 20:21:31 -04004940 goto restore_opts;
Aditya Kali7c319d32012-07-22 20:21:31 -04004941 }
4942 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004943#endif
Curt Wohlgemuthd4c402d2010-05-16 12:00:00 -04004944
4945 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4946 kfree(orig_data);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004947 return 0;
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04004948
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004949restore_opts:
4950 sb->s_flags = old_sb_flags;
4951 sbi->s_mount_opt = old_opts.s_mount_opt;
Theodore Ts'oa2595b82010-12-15 20:30:48 -05004952 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004953 sbi->s_resuid = old_opts.s_resuid;
4954 sbi->s_resgid = old_opts.s_resgid;
4955 sbi->s_commit_interval = old_opts.s_commit_interval;
Theodore Ts'o30773842009-01-03 20:27:38 -05004956 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4957 sbi->s_max_batch_time = old_opts.s_max_batch_time;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004958#ifdef CONFIG_QUOTA
4959 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
4960 for (i = 0; i < MAXQUOTAS; i++) {
Chen Gang03dafb52013-01-24 23:24:58 -05004961 kfree(sbi->s_qf_names[i]);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004962 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4963 }
4964#endif
Curt Wohlgemuthd4c402d2010-05-16 12:00:00 -04004965 kfree(orig_data);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004966 return err;
4967}
4968
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04004969static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004970{
4971 struct super_block *sb = dentry->d_sb;
Mingming Cao617ba132006-10-11 01:20:53 -07004972 struct ext4_sb_info *sbi = EXT4_SB(sb);
4973 struct ext4_super_block *es = sbi->s_es;
Lukas Czerner27dd4382013-04-09 22:11:22 -04004974 ext4_fsblk_t overhead = 0, resv_blocks;
Pekka Enberg960cc392006-12-06 20:35:29 -08004975 u64 fsid;
Kazuya Miod02a9392011-05-24 18:30:07 -04004976 s64 bfree;
Lukas Czerner27dd4382013-04-09 22:11:22 -04004977 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004978
Theodore Ts'o952fc182012-07-09 16:27:05 -04004979 if (!test_opt(sb, MINIX_DF))
4980 overhead = sbi->s_overhead;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004981
Mingming Cao617ba132006-10-11 01:20:53 -07004982 buf->f_type = EXT4_SUPER_MAGIC;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004983 buf->f_bsize = sb->s_blocksize;
Eric Sandeenb72f78c2012-11-08 10:33:36 -05004984 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
Theodore Ts'o57042652011-09-09 18:56:51 -04004985 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
4986 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
Kazuya Miod02a9392011-05-24 18:30:07 -04004987 /* prevent underflow in case that few free space is available */
Theodore Ts'o57042652011-09-09 18:56:51 -04004988 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
Lukas Czerner27dd4382013-04-09 22:11:22 -04004989 buf->f_bavail = buf->f_bfree -
4990 (ext4_r_blocks_count(es) + resv_blocks);
4991 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004992 buf->f_bavail = 0;
4993 buf->f_files = le32_to_cpu(es->s_inodes_count);
Peter Zijlstra52d9f3b2007-10-16 23:25:44 -07004994 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
Mingming Cao617ba132006-10-11 01:20:53 -07004995 buf->f_namelen = EXT4_NAME_LEN;
Pekka Enberg960cc392006-12-06 20:35:29 -08004996 fsid = le64_to_cpup((void *)es->s_uuid) ^
4997 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4998 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4999 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04005000
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005001 return 0;
5002}
5003
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04005004/* Helper function for writing quotas on sync - we need to start transaction
5005 * before quota file is locked for write. Otherwise the are possible deadlocks:
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005006 * Process 1 Process 2
Mingming Cao617ba132006-10-11 01:20:53 -07005007 * ext4_create() quota_sync()
Jan Karaa269eb12009-01-26 17:04:39 +01005008 * jbd2_journal_start() write_dquot()
Christoph Hellwig871a2932010-03-03 09:05:07 -05005009 * dquot_initialize() down(dqio_mutex)
Mingming Caodab291a2006-10-11 01:21:01 -07005010 * down(dqio_mutex) jbd2_journal_start()
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005011 *
5012 */
5013
5014#ifdef CONFIG_QUOTA
5015
5016static inline struct inode *dquot_to_inode(struct dquot *dquot)
5017{
Eric W. Biederman4c376dc2012-09-16 03:56:19 -07005018 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005019}
5020
Mingming Cao617ba132006-10-11 01:20:53 -07005021static int ext4_write_dquot(struct dquot *dquot)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005022{
5023 int ret, err;
5024 handle_t *handle;
5025 struct inode *inode;
5026
5027 inode = dquot_to_inode(dquot);
Theodore Ts'o9924a922013-02-08 21:59:22 -05005028 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04005029 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005030 if (IS_ERR(handle))
5031 return PTR_ERR(handle);
5032 ret = dquot_commit(dquot);
Mingming Cao617ba132006-10-11 01:20:53 -07005033 err = ext4_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005034 if (!ret)
5035 ret = err;
5036 return ret;
5037}
5038
Mingming Cao617ba132006-10-11 01:20:53 -07005039static int ext4_acquire_dquot(struct dquot *dquot)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005040{
5041 int ret, err;
5042 handle_t *handle;
5043
Theodore Ts'o9924a922013-02-08 21:59:22 -05005044 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04005045 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005046 if (IS_ERR(handle))
5047 return PTR_ERR(handle);
5048 ret = dquot_acquire(dquot);
Mingming Cao617ba132006-10-11 01:20:53 -07005049 err = ext4_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005050 if (!ret)
5051 ret = err;
5052 return ret;
5053}
5054
Mingming Cao617ba132006-10-11 01:20:53 -07005055static int ext4_release_dquot(struct dquot *dquot)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005056{
5057 int ret, err;
5058 handle_t *handle;
5059
Theodore Ts'o9924a922013-02-08 21:59:22 -05005060 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04005061 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
Jan Kara9c3013e2007-09-11 15:23:29 -07005062 if (IS_ERR(handle)) {
5063 /* Release dquot anyway to avoid endless cycle in dqput() */
5064 dquot_release(dquot);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005065 return PTR_ERR(handle);
Jan Kara9c3013e2007-09-11 15:23:29 -07005066 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005067 ret = dquot_release(dquot);
Mingming Cao617ba132006-10-11 01:20:53 -07005068 err = ext4_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005069 if (!ret)
5070 ret = err;
5071 return ret;
5072}
5073
Mingming Cao617ba132006-10-11 01:20:53 -07005074static int ext4_mark_dquot_dirty(struct dquot *dquot)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005075{
Jan Kara262b4662013-03-02 17:57:08 -05005076 struct super_block *sb = dquot->dq_sb;
5077 struct ext4_sb_info *sbi = EXT4_SB(sb);
5078
Jan Kara2c8be6b2008-05-13 21:27:55 -04005079 /* Are we journaling quotas? */
Jan Kara262b4662013-03-02 17:57:08 -05005080 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) ||
5081 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005082 dquot_mark_dquot_dirty(dquot);
Mingming Cao617ba132006-10-11 01:20:53 -07005083 return ext4_write_dquot(dquot);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005084 } else {
5085 return dquot_mark_dquot_dirty(dquot);
5086 }
5087}
5088
Mingming Cao617ba132006-10-11 01:20:53 -07005089static int ext4_write_info(struct super_block *sb, int type)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005090{
5091 int ret, err;
5092 handle_t *handle;
5093
5094 /* Data block + inode block */
Theodore Ts'o9924a922013-02-08 21:59:22 -05005095 handle = ext4_journal_start(sb->s_root->d_inode, EXT4_HT_QUOTA, 2);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005096 if (IS_ERR(handle))
5097 return PTR_ERR(handle);
5098 ret = dquot_commit_info(sb, type);
Mingming Cao617ba132006-10-11 01:20:53 -07005099 err = ext4_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005100 if (!ret)
5101 ret = err;
5102 return ret;
5103}
5104
5105/*
5106 * Turn on quotas during mount time - we need to find
5107 * the quota file and such...
5108 */
Mingming Cao617ba132006-10-11 01:20:53 -07005109static int ext4_quota_on_mount(struct super_block *sb, int type)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005110{
Christoph Hellwig287a8092010-05-19 07:16:45 -04005111 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
5112 EXT4_SB(sb)->s_jquota_fmt, type);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005113}
5114
5115/*
5116 * Standard function to be called on quota_on
5117 */
Mingming Cao617ba132006-10-11 01:20:53 -07005118static int ext4_quota_on(struct super_block *sb, int type, int format_id,
Jan Karaf00c9e42010-09-15 17:38:58 +02005119 struct path *path)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005120{
5121 int err;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005122
5123 if (!test_opt(sb, QUOTA))
5124 return -EINVAL;
Jan Kara06235432008-05-13 19:11:51 -04005125
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005126 /* Quotafile not on the same filesystem? */
Al Virod8c95842011-12-07 18:16:57 -05005127 if (path->dentry->d_sb != sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005128 return -EXDEV;
Jan Kara06235432008-05-13 19:11:51 -04005129 /* Journaling quota? */
5130 if (EXT4_SB(sb)->s_qf_names[type]) {
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04005131 /* Quotafile not in fs root? */
Jan Karaf00c9e42010-09-15 17:38:58 +02005132 if (path->dentry->d_parent != sb->s_root)
Eric Sandeenb31e1552009-06-04 17:36:36 -04005133 ext4_msg(sb, KERN_WARNING,
5134 "Quota file not on filesystem root. "
5135 "Journaled quota will not work");
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04005136 }
Jan Kara06235432008-05-13 19:11:51 -04005137
5138 /*
5139 * When we journal data on quota file, we have to flush journal to see
5140 * all updates to the file when we bypass pagecache...
5141 */
Frank Mayhar03901312009-01-07 00:06:22 -05005142 if (EXT4_SB(sb)->s_journal &&
Jan Karaf00c9e42010-09-15 17:38:58 +02005143 ext4_should_journal_data(path->dentry->d_inode)) {
Jan Kara06235432008-05-13 19:11:51 -04005144 /*
5145 * We don't need to lock updates but journal_flush() could
5146 * otherwise be livelocked...
5147 */
5148 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
Hidehiro Kawai7ffe1ea2008-10-10 20:29:21 -04005149 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
Jan Kara06235432008-05-13 19:11:51 -04005150 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
Jan Karaf00c9e42010-09-15 17:38:58 +02005151 if (err)
Hidehiro Kawai7ffe1ea2008-10-10 20:29:21 -04005152 return err;
Jan Kara06235432008-05-13 19:11:51 -04005153 }
5154
Jan Karaf00c9e42010-09-15 17:38:58 +02005155 return dquot_quota_on(sb, type, format_id, path);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005156}
5157
Aditya Kali7c319d32012-07-22 20:21:31 -04005158static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
5159 unsigned int flags)
5160{
5161 int err;
5162 struct inode *qf_inode;
5163 unsigned long qf_inums[MAXQUOTAS] = {
5164 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5165 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
5166 };
5167
5168 BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA));
5169
5170 if (!qf_inums[type])
5171 return -EPERM;
5172
5173 qf_inode = ext4_iget(sb, qf_inums[type]);
5174 if (IS_ERR(qf_inode)) {
5175 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
5176 return PTR_ERR(qf_inode);
5177 }
5178
Jan Karabcb13852013-04-09 09:21:41 -04005179 /* Don't account quota for quota files to avoid recursion */
5180 qf_inode->i_flags |= S_NOQUOTA;
Aditya Kali7c319d32012-07-22 20:21:31 -04005181 err = dquot_enable(qf_inode, type, format_id, flags);
5182 iput(qf_inode);
5183
5184 return err;
5185}
5186
5187/* Enable usage tracking for all quota types. */
5188static int ext4_enable_quotas(struct super_block *sb)
5189{
5190 int type, err = 0;
5191 unsigned long qf_inums[MAXQUOTAS] = {
5192 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5193 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
5194 };
5195
5196 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
5197 for (type = 0; type < MAXQUOTAS; type++) {
5198 if (qf_inums[type]) {
5199 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
5200 DQUOT_USAGE_ENABLED);
5201 if (err) {
5202 ext4_warning(sb,
Theodore Ts'o72ba7452013-01-24 23:24:54 -05005203 "Failed to enable quota tracking "
5204 "(type=%d, err=%d). Please run "
5205 "e2fsck to fix.", type, err);
Aditya Kali7c319d32012-07-22 20:21:31 -04005206 return err;
5207 }
5208 }
5209 }
5210 return 0;
5211}
5212
5213/*
5214 * quota_on function that is used when QUOTA feature is set.
5215 */
5216static int ext4_quota_on_sysfile(struct super_block *sb, int type,
5217 int format_id)
5218{
5219 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
5220 return -EINVAL;
5221
5222 /*
5223 * USAGE was enabled at mount time. Only need to enable LIMITS now.
5224 */
5225 return ext4_quota_enable(sb, type, format_id, DQUOT_LIMITS_ENABLED);
5226}
5227
Dmitry Monakhovca0e05e2010-08-01 17:48:36 -04005228static int ext4_quota_off(struct super_block *sb, int type)
5229{
Jan Kara21f97692011-04-04 15:33:39 -04005230 struct inode *inode = sb_dqopt(sb)->files[type];
5231 handle_t *handle;
5232
Dmitry Monakhov87009d82010-11-08 13:47:33 -05005233 /* Force all delayed allocation blocks to be allocated.
5234 * Caller already holds s_umount sem */
5235 if (test_opt(sb, DELALLOC))
Dmitry Monakhovca0e05e2010-08-01 17:48:36 -04005236 sync_filesystem(sb);
Dmitry Monakhovca0e05e2010-08-01 17:48:36 -04005237
Amir Goldstein0b268592011-05-16 09:59:13 -04005238 if (!inode)
5239 goto out;
5240
Jan Kara21f97692011-04-04 15:33:39 -04005241 /* Update modification times of quota files when userspace can
5242 * start looking at them */
Theodore Ts'o9924a922013-02-08 21:59:22 -05005243 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
Jan Kara21f97692011-04-04 15:33:39 -04005244 if (IS_ERR(handle))
5245 goto out;
5246 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
5247 ext4_mark_inode_dirty(handle, inode);
5248 ext4_journal_stop(handle);
5249
5250out:
Dmitry Monakhovca0e05e2010-08-01 17:48:36 -04005251 return dquot_quota_off(sb, type);
5252}
5253
Aditya Kali7c319d32012-07-22 20:21:31 -04005254/*
5255 * quota_off function that is used when QUOTA feature is set.
5256 */
5257static int ext4_quota_off_sysfile(struct super_block *sb, int type)
5258{
5259 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
5260 return -EINVAL;
5261
5262 /* Disable only the limits. */
5263 return dquot_disable(sb, type, DQUOT_LIMITS_ENABLED);
5264}
5265
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005266/* Read data from quotafile - avoid pagecache and such because we cannot afford
5267 * acquiring the locks... As quota files are never truncated and quota code
Lucas De Marchi25985ed2011-03-30 22:57:33 -03005268 * itself serializes the operations (and no one else should touch the files)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005269 * we don't have to be afraid of races */
Mingming Cao617ba132006-10-11 01:20:53 -07005270static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005271 size_t len, loff_t off)
5272{
5273 struct inode *inode = sb_dqopt(sb)->files[type];
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05005274 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005275 int err = 0;
5276 int offset = off & (sb->s_blocksize - 1);
5277 int tocopy;
5278 size_t toread;
5279 struct buffer_head *bh;
5280 loff_t i_size = i_size_read(inode);
5281
5282 if (off > i_size)
5283 return 0;
5284 if (off+len > i_size)
5285 len = i_size-off;
5286 toread = len;
5287 while (toread > 0) {
5288 tocopy = sb->s_blocksize - offset < toread ?
5289 sb->s_blocksize - offset : toread;
Mingming Cao617ba132006-10-11 01:20:53 -07005290 bh = ext4_bread(NULL, inode, blk, 0, &err);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005291 if (err)
5292 return err;
5293 if (!bh) /* A hole? */
5294 memset(data, 0, tocopy);
5295 else
5296 memcpy(data, bh->b_data+offset, tocopy);
5297 brelse(bh);
5298 offset = 0;
5299 toread -= tocopy;
5300 data += tocopy;
5301 blk++;
5302 }
5303 return len;
5304}
5305
5306/* Write to quotafile (we know the transaction is already started and has
5307 * enough credits) */
Mingming Cao617ba132006-10-11 01:20:53 -07005308static ssize_t ext4_quota_write(struct super_block *sb, int type,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005309 const char *data, size_t len, loff_t off)
5310{
5311 struct inode *inode = sb_dqopt(sb)->files[type];
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05005312 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005313 int err = 0;
5314 int offset = off & (sb->s_blocksize - 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005315 struct buffer_head *bh;
5316 handle_t *handle = journal_current_handle();
5317
Frank Mayhar03901312009-01-07 00:06:22 -05005318 if (EXT4_SB(sb)->s_journal && !handle) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04005319 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5320 " cancelled because transaction is not started",
Jan Kara9c3013e2007-09-11 15:23:29 -07005321 (unsigned long long)off, (unsigned long long)len);
5322 return -EIO;
5323 }
Dmitry Monakhov67eeb562010-03-02 08:08:51 -05005324 /*
5325 * Since we account only one data block in transaction credits,
5326 * then it is impossible to cross a block boundary.
5327 */
5328 if (sb->s_blocksize - offset < len) {
5329 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5330 " cancelled because not block aligned",
5331 (unsigned long long)off, (unsigned long long)len);
5332 return -EIO;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005333 }
Dmitry Monakhov67eeb562010-03-02 08:08:51 -05005334
Dmitry Monakhov67eeb562010-03-02 08:08:51 -05005335 bh = ext4_bread(handle, inode, blk, 1, &err);
5336 if (!bh)
5337 goto out;
Jan Kara62d2b5f2010-07-27 11:56:07 -04005338 err = ext4_journal_get_write_access(handle, bh);
5339 if (err) {
5340 brelse(bh);
5341 goto out;
Dmitry Monakhov67eeb562010-03-02 08:08:51 -05005342 }
5343 lock_buffer(bh);
5344 memcpy(bh->b_data+offset, data, len);
5345 flush_dcache_page(bh->b_page);
5346 unlock_buffer(bh);
Jan Kara62d2b5f2010-07-27 11:56:07 -04005347 err = ext4_handle_dirty_metadata(handle, NULL, bh);
Dmitry Monakhov67eeb562010-03-02 08:08:51 -05005348 brelse(bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005349out:
Jan Kara0b7f7ce2012-04-25 21:26:54 +02005350 if (err)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005351 return err;
Dmitry Monakhov67eeb562010-03-02 08:08:51 -05005352 if (inode->i_size < off + len) {
5353 i_size_write(inode, off + len);
Mingming Cao617ba132006-10-11 01:20:53 -07005354 EXT4_I(inode)->i_disksize = inode->i_size;
Jan Kara21f97692011-04-04 15:33:39 -04005355 ext4_mark_inode_dirty(handle, inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005356 }
Dmitry Monakhov67eeb562010-03-02 08:08:51 -05005357 return len;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005358}
5359
5360#endif
5361
Al Viro152a0832010-07-25 00:46:55 +04005362static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5363 const char *dev_name, void *data)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005364{
Al Viro152a0832010-07-25 00:46:55 +04005365 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005366}
5367
Theodore Ts'o37f328e2010-03-24 20:06:41 -04005368#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
Theodore Ts'o24b58422009-12-07 14:08:51 -05005369static inline void register_as_ext2(void)
5370{
5371 int err = register_filesystem(&ext2_fs_type);
5372 if (err)
5373 printk(KERN_WARNING
5374 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5375}
5376
5377static inline void unregister_as_ext2(void)
5378{
5379 unregister_filesystem(&ext2_fs_type);
5380}
Theodore Ts'o2035e772011-04-18 17:29:14 -04005381
5382static inline int ext2_feature_set_ok(struct super_block *sb)
5383{
5384 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
5385 return 0;
5386 if (sb->s_flags & MS_RDONLY)
5387 return 1;
5388 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
5389 return 0;
5390 return 1;
5391}
Theodore Ts'o24b58422009-12-07 14:08:51 -05005392#else
5393static inline void register_as_ext2(void) { }
5394static inline void unregister_as_ext2(void) { }
Theodore Ts'o2035e772011-04-18 17:29:14 -04005395static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
Theodore Ts'o24b58422009-12-07 14:08:51 -05005396#endif
5397
Theodore Ts'o37f328e2010-03-24 20:06:41 -04005398#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
Theodore Ts'o24b58422009-12-07 14:08:51 -05005399static inline void register_as_ext3(void)
5400{
5401 int err = register_filesystem(&ext3_fs_type);
5402 if (err)
5403 printk(KERN_WARNING
5404 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5405}
5406
5407static inline void unregister_as_ext3(void)
5408{
5409 unregister_filesystem(&ext3_fs_type);
5410}
Theodore Ts'o2035e772011-04-18 17:29:14 -04005411
5412static inline int ext3_feature_set_ok(struct super_block *sb)
5413{
5414 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
5415 return 0;
5416 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
5417 return 0;
5418 if (sb->s_flags & MS_RDONLY)
5419 return 1;
5420 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
5421 return 0;
5422 return 1;
5423}
Theodore Ts'o24b58422009-12-07 14:08:51 -05005424#else
5425static inline void register_as_ext3(void) { }
5426static inline void unregister_as_ext3(void) { }
Theodore Ts'o2035e772011-04-18 17:29:14 -04005427static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
Theodore Ts'o24b58422009-12-07 14:08:51 -05005428#endif
5429
Theodore Ts'o03010a32008-10-10 20:02:48 -04005430static struct file_system_type ext4_fs_type = {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005431 .owner = THIS_MODULE,
Theodore Ts'o03010a32008-10-10 20:02:48 -04005432 .name = "ext4",
Al Viro152a0832010-07-25 00:46:55 +04005433 .mount = ext4_mount,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005434 .kill_sb = kill_block_super,
5435 .fs_flags = FS_REQUIRES_DEV,
5436};
Eric W. Biederman7f78e032013-03-02 19:39:14 -08005437MODULE_ALIAS_FS("ext4");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005438
Lukas Czerner8f021222011-02-03 14:33:33 -05005439static int __init ext4_init_feat_adverts(void)
Lukas Czerner857ac882010-10-27 21:30:05 -04005440{
5441 struct ext4_features *ef;
5442 int ret = -ENOMEM;
5443
5444 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
5445 if (!ef)
5446 goto out;
5447
5448 ef->f_kobj.kset = ext4_kset;
5449 init_completion(&ef->f_kobj_unregister);
5450 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
5451 "features");
5452 if (ret) {
5453 kfree(ef);
5454 goto out;
5455 }
5456
5457 ext4_feat = ef;
5458 ret = 0;
5459out:
5460 return ret;
5461}
5462
Lukas Czerner8f021222011-02-03 14:33:33 -05005463static void ext4_exit_feat_adverts(void)
5464{
5465 kobject_put(&ext4_feat->f_kobj);
5466 wait_for_completion(&ext4_feat->f_kobj_unregister);
5467 kfree(ext4_feat);
5468}
5469
Eric Sandeene9e3bce2011-02-12 08:17:34 -05005470/* Shared across all ext4 file systems */
5471wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
5472struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
5473
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04005474static int __init ext4_init_fs(void)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005475{
Eric Sandeene9e3bce2011-02-12 08:17:34 -05005476 int i, err;
Alex Tomasc9de5602008-01-29 00:19:52 -05005477
Al Viro07c0c5d82012-03-20 22:05:02 -04005478 ext4_li_info = NULL;
5479 mutex_init(&ext4_li_mtx);
5480
Carlos Maiolino9a4c8012012-12-10 16:30:45 -05005481 /* Build-time check for flags consistency */
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04005482 ext4_check_flag_values();
Eric Sandeene9e3bce2011-02-12 08:17:34 -05005483
5484 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
5485 mutex_init(&ext4__aio_mutex[i]);
5486 init_waitqueue_head(&ext4__ioend_wq[i]);
5487 }
5488
Zheng Liu51865fd2012-11-08 21:57:32 -05005489 err = ext4_init_es();
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04005490 if (err)
5491 return err;
Zheng Liu51865fd2012-11-08 21:57:32 -05005492
5493 err = ext4_init_pageio();
5494 if (err)
5495 goto out7;
5496
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04005497 err = ext4_init_system_zone();
Theodore Ts'obd2d0212010-10-27 21:30:10 -04005498 if (err)
Fabrice Jouhaudd44651d2011-10-08 16:26:03 -04005499 goto out6;
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04005500 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
Theodore Ts'o0e376b12012-08-17 10:04:17 -04005501 if (!ext4_kset) {
5502 err = -ENOMEM;
Theodore Ts'odd683142011-02-03 14:33:49 -05005503 goto out5;
Theodore Ts'o0e376b12012-08-17 10:04:17 -04005504 }
Fabrice Jouhaudd44651d2011-10-08 16:26:03 -04005505 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
Lukas Czerner857ac882010-10-27 21:30:05 -04005506
5507 err = ext4_init_feat_adverts();
Theodore Ts'odd683142011-02-03 14:33:49 -05005508 if (err)
5509 goto out4;
Lukas Czerner857ac882010-10-27 21:30:05 -04005510
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04005511 err = ext4_init_mballoc();
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005512 if (err)
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04005513 goto out3;
Alex Tomasc9de5602008-01-29 00:19:52 -05005514
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04005515 err = ext4_init_xattr();
Alex Tomasc9de5602008-01-29 00:19:52 -05005516 if (err)
5517 goto out2;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005518 err = init_inodecache();
5519 if (err)
5520 goto out1;
Theodore Ts'o24b58422009-12-07 14:08:51 -05005521 register_as_ext3();
Theodore Ts'o2035e772011-04-18 17:29:14 -04005522 register_as_ext2();
Theodore Ts'o03010a32008-10-10 20:02:48 -04005523 err = register_filesystem(&ext4_fs_type);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005524 if (err)
5525 goto out;
Lukas Czernerbfff6872010-10-27 21:30:05 -04005526
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005527 return 0;
5528out:
Theodore Ts'o24b58422009-12-07 14:08:51 -05005529 unregister_as_ext2();
5530 unregister_as_ext3();
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005531 destroy_inodecache();
5532out1:
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04005533 ext4_exit_xattr();
Alex Tomasc9de5602008-01-29 00:19:52 -05005534out2:
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04005535 ext4_exit_mballoc();
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04005536out3:
Lukas Czerner8f021222011-02-03 14:33:33 -05005537 ext4_exit_feat_adverts();
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04005538out4:
Fabrice Jouhaudd44651d2011-10-08 16:26:03 -04005539 if (ext4_proc_root)
5540 remove_proc_entry("fs/ext4", NULL);
Theodore Ts'odd683142011-02-03 14:33:49 -05005541 kset_unregister(ext4_kset);
Fabrice Jouhaudd44651d2011-10-08 16:26:03 -04005542out5:
Theodore Ts'odd683142011-02-03 14:33:49 -05005543 ext4_exit_system_zone();
Fabrice Jouhaudd44651d2011-10-08 16:26:03 -04005544out6:
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04005545 ext4_exit_pageio();
Zheng Liu51865fd2012-11-08 21:57:32 -05005546out7:
5547 ext4_exit_es();
5548
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005549 return err;
5550}
5551
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04005552static void __exit ext4_exit_fs(void)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005553{
Lukas Czernerbfff6872010-10-27 21:30:05 -04005554 ext4_destroy_lazyinit_thread();
Theodore Ts'o24b58422009-12-07 14:08:51 -05005555 unregister_as_ext2();
5556 unregister_as_ext3();
Theodore Ts'o03010a32008-10-10 20:02:48 -04005557 unregister_filesystem(&ext4_fs_type);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005558 destroy_inodecache();
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04005559 ext4_exit_xattr();
5560 ext4_exit_mballoc();
Lukas Czerner8f021222011-02-03 14:33:33 -05005561 ext4_exit_feat_adverts();
Theodore Ts'o9f6200b2008-09-23 09:18:24 -04005562 remove_proc_entry("fs/ext4", NULL);
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04005563 kset_unregister(ext4_kset);
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04005564 ext4_exit_system_zone();
5565 ext4_exit_pageio();
Eric Sandeendd12ed12013-07-26 15:21:11 -04005566 ext4_exit_es();
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005567}
5568
5569MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
Theodore Ts'o83982b62009-01-06 14:53:16 -05005570MODULE_DESCRIPTION("Fourth Extended Filesystem");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07005571MODULE_LICENSE("GPL");
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04005572module_init(ext4_init_fs)
5573module_exit(ext4_exit_fs)