blob: fb15c9c0be74d5c06ba421f04449d981a69337ed [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>
Dave Kleikampac27a0e2006-10-11 01:20:50 -070041#include <asm/uaccess.h>
42
Lukas Czernerbfff6872010-10-27 21:30:05 -040043#include <linux/kthread.h>
44#include <linux/freezer.h>
45
Christoph Hellwig3dcf5452008-04-29 18:13:32 -040046#include "ext4.h"
47#include "ext4_jbd2.h"
Dave Kleikampac27a0e2006-10-11 01:20:50 -070048#include "xattr.h"
49#include "acl.h"
Theodore Ts'o3661d282009-09-14 22:59:50 -040050#include "mballoc.h"
Dave Kleikampac27a0e2006-10-11 01:20:50 -070051
Theodore Ts'o9bffad12009-06-17 11:48:11 -040052#define CREATE_TRACE_POINTS
53#include <trace/events/ext4.h>
54
Theodore Ts'o1f109d52010-10-27 21:30:14 -040055static struct proc_dir_entry *ext4_proc_root;
Theodore Ts'o3197ebd2009-03-31 09:10:09 -040056static struct kset *ext4_kset;
Lukas Czernerbfff6872010-10-27 21:30:05 -040057struct ext4_lazy_init *ext4_li_info;
58struct mutex ext4_li_mtx;
Lukas Czerner857ac882010-10-27 21:30:05 -040059struct ext4_features *ext4_feat;
Theodore Ts'o9f6200b2008-09-23 09:18:24 -040060
Mingming Cao617ba132006-10-11 01:20:53 -070061static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
Dave Kleikampac27a0e2006-10-11 01:20:50 -070062 unsigned long journal_devnum);
Theodore Ts'oe2d67052009-05-01 00:33:44 -040063static int ext4_commit_super(struct super_block *sb, int sync);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -040064static void ext4_mark_recovery_complete(struct super_block *sb,
65 struct ext4_super_block *es);
66static void ext4_clear_journal_err(struct super_block *sb,
67 struct ext4_super_block *es);
Mingming Cao617ba132006-10-11 01:20:53 -070068static int ext4_sync_fs(struct super_block *sb, int wait);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -040069static const char *ext4_decode_error(struct super_block *sb, int errno,
Dave Kleikampac27a0e2006-10-11 01:20:50 -070070 char nbuf[16]);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -040071static int ext4_remount(struct super_block *sb, int *flags, char *data);
72static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
Takashi Satoc4be0c12009-01-09 16:40:58 -080073static int ext4_unfreeze(struct super_block *sb);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -040074static void ext4_write_super(struct super_block *sb);
Takashi Satoc4be0c12009-01-09 16:40:58 -080075static int ext4_freeze(struct super_block *sb);
Al Viro152a0832010-07-25 00:46:55 +040076static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
77 const char *dev_name, void *data);
Lukas Czernerbfff6872010-10-27 21:30:05 -040078static void ext4_destroy_lazyinit_thread(void);
79static void ext4_unregister_li_request(struct super_block *sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -070080
Jan Karaba69f9a2010-03-24 20:18:37 -040081#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
82static struct file_system_type ext3_fs_type = {
83 .owner = THIS_MODULE,
84 .name = "ext3",
Al Viro152a0832010-07-25 00:46:55 +040085 .mount = ext4_mount,
Jan Karaba69f9a2010-03-24 20:18:37 -040086 .kill_sb = kill_block_super,
87 .fs_flags = FS_REQUIRES_DEV,
88};
89#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
90#else
91#define IS_EXT3_SB(sb) (0)
92#endif
Laurent Vivierbd81d8e2006-10-11 01:21:10 -070093
Alexandre Ratchov8fadc142006-10-11 01:21:15 -070094ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
95 struct ext4_group_desc *bg)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -070096{
Aneesh Kumar K.V3a145892007-10-16 18:38:25 -040097 return le32_to_cpu(bg->bg_block_bitmap_lo) |
Alexandre Ratchov8fadc142006-10-11 01:21:15 -070098 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
Andreas Dilger0b8e58a2009-06-03 17:59:28 -040099 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700100}
101
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700102ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
103 struct ext4_group_desc *bg)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700104{
Aneesh Kumar K.V5272f832007-10-16 18:38:25 -0400105 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700106 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
Andreas Dilger0b8e58a2009-06-03 17:59:28 -0400107 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700108}
109
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700110ext4_fsblk_t ext4_inode_table(struct super_block *sb,
111 struct ext4_group_desc *bg)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700112{
Aneesh Kumar K.V5272f832007-10-16 18:38:25 -0400113 return le32_to_cpu(bg->bg_inode_table_lo) |
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700114 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
Andreas Dilger0b8e58a2009-06-03 17:59:28 -0400115 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700116}
117
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500118__u32 ext4_free_blks_count(struct super_block *sb,
119 struct ext4_group_desc *bg)
120{
121 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
122 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
Andreas Dilger0b8e58a2009-06-03 17:59:28 -0400123 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500124}
125
126__u32 ext4_free_inodes_count(struct super_block *sb,
127 struct ext4_group_desc *bg)
128{
129 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
130 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
Andreas Dilger0b8e58a2009-06-03 17:59:28 -0400131 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500132}
133
134__u32 ext4_used_dirs_count(struct super_block *sb,
135 struct ext4_group_desc *bg)
136{
137 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
138 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
Andreas Dilger0b8e58a2009-06-03 17:59:28 -0400139 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500140}
141
142__u32 ext4_itable_unused_count(struct super_block *sb,
143 struct ext4_group_desc *bg)
144{
145 return le16_to_cpu(bg->bg_itable_unused_lo) |
146 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
Andreas Dilger0b8e58a2009-06-03 17:59:28 -0400147 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500148}
149
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700150void ext4_block_bitmap_set(struct super_block *sb,
151 struct ext4_group_desc *bg, ext4_fsblk_t blk)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700152{
Aneesh Kumar K.V3a145892007-10-16 18:38:25 -0400153 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700154 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
155 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700156}
157
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700158void ext4_inode_bitmap_set(struct super_block *sb,
159 struct ext4_group_desc *bg, ext4_fsblk_t blk)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700160{
Aneesh Kumar K.V5272f832007-10-16 18:38:25 -0400161 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700162 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
163 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700164}
165
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700166void ext4_inode_table_set(struct super_block *sb,
167 struct ext4_group_desc *bg, ext4_fsblk_t blk)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700168{
Aneesh Kumar K.V5272f832007-10-16 18:38:25 -0400169 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700170 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
171 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700172}
173
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500174void ext4_free_blks_set(struct super_block *sb,
175 struct ext4_group_desc *bg, __u32 count)
176{
177 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
178 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
179 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
180}
181
182void ext4_free_inodes_set(struct super_block *sb,
183 struct ext4_group_desc *bg, __u32 count)
184{
185 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
186 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
187 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
188}
189
190void ext4_used_dirs_set(struct super_block *sb,
191 struct ext4_group_desc *bg, __u32 count)
192{
193 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
194 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
195 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
196}
197
198void ext4_itable_unused_set(struct super_block *sb,
199 struct ext4_group_desc *bg, __u32 count)
200{
201 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
202 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
203 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
204}
205
Curt Wohlgemuthd3d1faf2009-09-29 11:01:03 -0400206
207/* Just increment the non-pointer handle value */
208static handle_t *ext4_get_nojournal(void)
209{
210 handle_t *handle = current->journal_info;
211 unsigned long ref_cnt = (unsigned long)handle;
212
213 BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
214
215 ref_cnt++;
216 handle = (handle_t *)ref_cnt;
217
218 current->journal_info = handle;
219 return handle;
220}
221
222
223/* Decrement the non-pointer handle value */
224static void ext4_put_nojournal(handle_t *handle)
225{
226 unsigned long ref_cnt = (unsigned long)handle;
227
228 BUG_ON(ref_cnt == 0);
229
230 ref_cnt--;
231 handle = (handle_t *)ref_cnt;
232
233 current->journal_info = handle;
234}
235
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700236/*
Mingming Caodab291a2006-10-11 01:21:01 -0700237 * Wrappers for jbd2_journal_start/end.
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700238 *
239 * The only special thing we need to do here is to make sure that all
240 * journal_end calls result in the superblock being marked dirty, so
241 * that sync() will call the filesystem's write_super callback if
242 * appropriate.
243 */
Mingming Cao617ba132006-10-11 01:20:53 -0700244handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700245{
246 journal_t *journal;
247
248 if (sb->s_flags & MS_RDONLY)
249 return ERR_PTR(-EROFS);
250
Eric Sandeen437f88c2010-08-01 17:33:29 -0400251 vfs_check_frozen(sb, SB_FREEZE_TRANS);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700252 /* Special case here: if the journal has aborted behind our
253 * backs (eg. EIO in the commit thread), then we still need to
254 * take the FS itself readonly cleanly. */
Mingming Cao617ba132006-10-11 01:20:53 -0700255 journal = EXT4_SB(sb)->s_journal;
Frank Mayhar03901312009-01-07 00:06:22 -0500256 if (journal) {
257 if (is_journal_aborted(journal)) {
Theodore Ts'oc67d8592010-06-29 11:07:07 -0400258 ext4_abort(sb, "Detected aborted journal");
Frank Mayhar03901312009-01-07 00:06:22 -0500259 return ERR_PTR(-EROFS);
260 }
261 return jbd2_journal_start(journal, nblocks);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700262 }
Curt Wohlgemuthd3d1faf2009-09-29 11:01:03 -0400263 return ext4_get_nojournal();
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700264}
265
266/*
267 * The only special thing we need to do here is to make sure that all
Mingming Caodab291a2006-10-11 01:21:01 -0700268 * jbd2_journal_stop calls result in the superblock being marked dirty, so
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700269 * that sync() will call the filesystem's write_super callback if
270 * appropriate.
271 */
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400272int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700273{
274 struct super_block *sb;
275 int err;
276 int rc;
277
Frank Mayhar03901312009-01-07 00:06:22 -0500278 if (!ext4_handle_valid(handle)) {
Curt Wohlgemuthd3d1faf2009-09-29 11:01:03 -0400279 ext4_put_nojournal(handle);
Frank Mayhar03901312009-01-07 00:06:22 -0500280 return 0;
281 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700282 sb = handle->h_transaction->t_journal->j_private;
283 err = handle->h_err;
Mingming Caodab291a2006-10-11 01:21:01 -0700284 rc = jbd2_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700285
286 if (!err)
287 err = rc;
288 if (err)
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400289 __ext4_std_error(sb, where, line, err);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700290 return err;
291}
292
Theodore Ts'o90c72012010-06-29 14:53:24 -0400293void ext4_journal_abort_handle(const char *caller, unsigned int line,
294 const char *err_fn, struct buffer_head *bh,
295 handle_t *handle, int err)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700296{
297 char nbuf[16];
Mingming Cao617ba132006-10-11 01:20:53 -0700298 const char *errstr = ext4_decode_error(NULL, err, nbuf);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700299
Frank Mayhar03901312009-01-07 00:06:22 -0500300 BUG_ON(!ext4_handle_valid(handle));
301
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700302 if (bh)
303 BUFFER_TRACE(bh, "abort");
304
305 if (!handle->h_err)
306 handle->h_err = err;
307
308 if (is_handle_aborted(handle))
309 return;
310
Theodore Ts'o90c72012010-06-29 14:53:24 -0400311 printk(KERN_ERR "%s:%d: aborting transaction: %s in %s\n",
312 caller, line, errstr, err_fn);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700313
Mingming Caodab291a2006-10-11 01:21:01 -0700314 jbd2_journal_abort_handle(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700315}
316
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400317static void __save_error_info(struct super_block *sb, const char *func,
318 unsigned int line)
319{
320 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
321
322 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
323 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
324 es->s_last_error_time = cpu_to_le32(get_seconds());
325 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
326 es->s_last_error_line = cpu_to_le32(line);
327 if (!es->s_first_error_time) {
328 es->s_first_error_time = es->s_last_error_time;
329 strncpy(es->s_first_error_func, func,
330 sizeof(es->s_first_error_func));
331 es->s_first_error_line = cpu_to_le32(line);
332 es->s_first_error_ino = es->s_last_error_ino;
333 es->s_first_error_block = es->s_last_error_block;
334 }
Theodore Ts'o66e61a92010-07-27 11:56:04 -0400335 /*
336 * Start the daily error reporting function if it hasn't been
337 * started already
338 */
339 if (!es->s_error_count)
340 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400341 es->s_error_count = cpu_to_le32(le32_to_cpu(es->s_error_count) + 1);
342}
343
344static void save_error_info(struct super_block *sb, const char *func,
345 unsigned int line)
346{
347 __save_error_info(sb, func, line);
348 ext4_commit_super(sb, 1);
349}
350
351
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700352/* Deal with the reporting of failure conditions on a filesystem such as
353 * inconsistencies detected or read IO failures.
354 *
355 * On ext2, we can store the error state of the filesystem in the
Mingming Cao617ba132006-10-11 01:20:53 -0700356 * superblock. That is not possible on ext4, because we may have other
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700357 * write ordering constraints on the superblock which prevent us from
358 * writing it out straight away; and given that the journal is about to
359 * be aborted, we can't rely on the current, or future, transactions to
360 * write out the superblock safely.
361 *
Mingming Caodab291a2006-10-11 01:21:01 -0700362 * 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 -0200363 * the journal instead. On recovery, the journal will complain about
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700364 * that error until we've noted it down and cleared it.
365 */
366
Mingming Cao617ba132006-10-11 01:20:53 -0700367static void ext4_handle_error(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700368{
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700369 if (sb->s_flags & MS_RDONLY)
370 return;
371
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400372 if (!test_opt(sb, ERRORS_CONT)) {
Mingming Cao617ba132006-10-11 01:20:53 -0700373 journal_t *journal = EXT4_SB(sb)->s_journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700374
Theodore Ts'o4ab2f152009-06-13 10:09:36 -0400375 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700376 if (journal)
Mingming Caodab291a2006-10-11 01:21:01 -0700377 jbd2_journal_abort(journal, -EIO);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700378 }
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400379 if (test_opt(sb, ERRORS_RO)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -0400380 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700381 sb->s_flags |= MS_RDONLY;
382 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700383 if (test_opt(sb, ERRORS_PANIC))
Mingming Cao617ba132006-10-11 01:20:53 -0700384 panic("EXT4-fs (device %s): panic forced after error\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700385 sb->s_id);
386}
387
Eric Sandeen12062dd2010-02-15 14:19:27 -0500388void __ext4_error(struct super_block *sb, const char *function,
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400389 unsigned int line, const char *fmt, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700390{
391 va_list args;
392
393 va_start(args, fmt);
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400394 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: ",
395 sb->s_id, function, line, current->comm);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700396 vprintk(fmt, args);
397 printk("\n");
398 va_end(args);
399
Mingming Cao617ba132006-10-11 01:20:53 -0700400 ext4_handle_error(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700401}
402
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400403void ext4_error_inode(struct inode *inode, const char *function,
404 unsigned int line, ext4_fsblk_t block,
Frank Mayhar273df552010-03-02 11:46:09 -0500405 const char *fmt, ...)
406{
407 va_list args;
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400408 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
Frank Mayhar273df552010-03-02 11:46:09 -0500409
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400410 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
411 es->s_last_error_block = cpu_to_le64(block);
412 save_error_info(inode->i_sb, function, line);
Frank Mayhar273df552010-03-02 11:46:09 -0500413 va_start(args, fmt);
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400414 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: inode #%lu: ",
415 inode->i_sb->s_id, function, line, inode->i_ino);
416 if (block)
417 printk("block %llu: ", block);
418 printk("comm %s: ", current->comm);
Frank Mayhar273df552010-03-02 11:46:09 -0500419 vprintk(fmt, args);
420 printk("\n");
421 va_end(args);
422
423 ext4_handle_error(inode->i_sb);
424}
425
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400426void ext4_error_file(struct file *file, const char *function,
427 unsigned int line, const char *fmt, ...)
Frank Mayhar273df552010-03-02 11:46:09 -0500428{
429 va_list args;
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400430 struct ext4_super_block *es;
Frank Mayhar273df552010-03-02 11:46:09 -0500431 struct inode *inode = file->f_dentry->d_inode;
432 char pathname[80], *path;
433
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400434 es = EXT4_SB(inode->i_sb)->s_es;
435 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
436 save_error_info(inode->i_sb, function, line);
Frank Mayhar273df552010-03-02 11:46:09 -0500437 va_start(args, fmt);
438 path = d_path(&(file->f_path), pathname, sizeof(pathname));
439 if (!path)
440 path = "(unknown)";
441 printk(KERN_CRIT
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400442 "EXT4-fs error (device %s): %s:%d: inode #%lu "
443 "(comm %s path %s): ",
444 inode->i_sb->s_id, function, line, inode->i_ino,
445 current->comm, path);
Frank Mayhar273df552010-03-02 11:46:09 -0500446 vprintk(fmt, args);
447 printk("\n");
448 va_end(args);
449
450 ext4_handle_error(inode->i_sb);
451}
452
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400453static const char *ext4_decode_error(struct super_block *sb, int errno,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700454 char nbuf[16])
455{
456 char *errstr = NULL;
457
458 switch (errno) {
459 case -EIO:
460 errstr = "IO failure";
461 break;
462 case -ENOMEM:
463 errstr = "Out of memory";
464 break;
465 case -EROFS:
Theodore Ts'o78f1ddb2009-07-27 23:09:47 -0400466 if (!sb || (EXT4_SB(sb)->s_journal &&
467 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700468 errstr = "Journal has aborted";
469 else
470 errstr = "Readonly filesystem";
471 break;
472 default:
473 /* If the caller passed in an extra buffer for unknown
474 * errors, textualise them now. Else we just return
475 * NULL. */
476 if (nbuf) {
477 /* Check for truncated error codes... */
478 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
479 errstr = nbuf;
480 }
481 break;
482 }
483
484 return errstr;
485}
486
Mingming Cao617ba132006-10-11 01:20:53 -0700487/* __ext4_std_error decodes expected errors from journaling functions
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700488 * automatically and invokes the appropriate error response. */
489
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400490void __ext4_std_error(struct super_block *sb, const char *function,
491 unsigned int line, int errno)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700492{
493 char nbuf[16];
494 const char *errstr;
495
496 /* Special case: if the error is EROFS, and we're not already
497 * inside a transaction, then there's really no point in logging
498 * an error. */
499 if (errno == -EROFS && journal_current_handle() == NULL &&
500 (sb->s_flags & MS_RDONLY))
501 return;
502
Mingming Cao617ba132006-10-11 01:20:53 -0700503 errstr = ext4_decode_error(sb, errno, nbuf);
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400504 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
505 sb->s_id, function, line, errstr);
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400506 save_error_info(sb, function, line);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700507
Mingming Cao617ba132006-10-11 01:20:53 -0700508 ext4_handle_error(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700509}
510
511/*
Mingming Cao617ba132006-10-11 01:20:53 -0700512 * ext4_abort is a much stronger failure handler than ext4_error. The
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700513 * abort function may be used to deal with unrecoverable failures such
514 * as journal IO errors or ENOMEM at a critical moment in log management.
515 *
516 * We unconditionally force the filesystem into an ABORT|READONLY state,
517 * unless the error response on the fs has been set to panic in which
518 * case we take the easy way out and panic immediately.
519 */
520
Theodore Ts'oc67d8592010-06-29 11:07:07 -0400521void __ext4_abort(struct super_block *sb, const char *function,
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400522 unsigned int line, const char *fmt, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700523{
524 va_list args;
525
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400526 save_error_info(sb, function, line);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700527 va_start(args, fmt);
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400528 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
529 function, line);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700530 vprintk(fmt, args);
531 printk("\n");
532 va_end(args);
533
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400534 if ((sb->s_flags & MS_RDONLY) == 0) {
535 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
536 sb->s_flags |= MS_RDONLY;
537 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
538 if (EXT4_SB(sb)->s_journal)
539 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
540 save_error_info(sb, function, line);
541 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700542 if (test_opt(sb, ERRORS_PANIC))
Mingming Cao617ba132006-10-11 01:20:53 -0700543 panic("EXT4-fs panic from previous error\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700544}
545
Eric Sandeenb31e1552009-06-04 17:36:36 -0400546void ext4_msg (struct super_block * sb, const char *prefix,
547 const char *fmt, ...)
548{
549 va_list args;
550
551 va_start(args, fmt);
552 printk("%sEXT4-fs (%s): ", prefix, sb->s_id);
553 vprintk(fmt, args);
554 printk("\n");
555 va_end(args);
556}
557
Eric Sandeen12062dd2010-02-15 14:19:27 -0500558void __ext4_warning(struct super_block *sb, const char *function,
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400559 unsigned int line, const char *fmt, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700560{
561 va_list args;
562
563 va_start(args, fmt);
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400564 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: ",
565 sb->s_id, function, line);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700566 vprintk(fmt, args);
567 printk("\n");
568 va_end(args);
569}
570
Theodore Ts'oe29136f2010-06-29 12:54:28 -0400571void __ext4_grp_locked_error(const char *function, unsigned int line,
572 struct super_block *sb, ext4_group_t grp,
573 unsigned long ino, ext4_fsblk_t block,
574 const char *fmt, ...)
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -0500575__releases(bitlock)
576__acquires(bitlock)
577{
578 va_list args;
579 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
580
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400581 es->s_last_error_ino = cpu_to_le32(ino);
582 es->s_last_error_block = cpu_to_le64(block);
583 __save_error_info(sb, function, line);
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -0500584 va_start(args, fmt);
Theodore Ts'oe29136f2010-06-29 12:54:28 -0400585 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u",
586 sb->s_id, function, line, grp);
587 if (ino)
588 printk("inode %lu: ", ino);
589 if (block)
590 printk("block %llu:", (unsigned long long) block);
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -0500591 vprintk(fmt, args);
592 printk("\n");
593 va_end(args);
594
595 if (test_opt(sb, ERRORS_CONT)) {
Theodore Ts'oe2d67052009-05-01 00:33:44 -0400596 ext4_commit_super(sb, 0);
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -0500597 return;
598 }
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400599
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -0500600 ext4_unlock_group(sb, grp);
601 ext4_handle_error(sb);
602 /*
603 * We only get here in the ERRORS_RO case; relocking the group
604 * may be dangerous, but nothing bad will happen since the
605 * filesystem will have already been marked read/only and the
606 * journal has been aborted. We return 1 as a hint to callers
607 * who might what to use the return value from
608 * ext4_grp_locked_error() to distinguish beween the
609 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
610 * aggressively from the ext4 function in question, with a
611 * more appropriate error code.
612 */
613 ext4_lock_group(sb, grp);
614 return;
615}
616
Mingming Cao617ba132006-10-11 01:20:53 -0700617void ext4_update_dynamic_rev(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700618{
Mingming Cao617ba132006-10-11 01:20:53 -0700619 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700620
Mingming Cao617ba132006-10-11 01:20:53 -0700621 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700622 return;
623
Eric Sandeen12062dd2010-02-15 14:19:27 -0500624 ext4_warning(sb,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700625 "updating to rev %d because of new feature flag, "
626 "running e2fsck is recommended",
Mingming Cao617ba132006-10-11 01:20:53 -0700627 EXT4_DYNAMIC_REV);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700628
Mingming Cao617ba132006-10-11 01:20:53 -0700629 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
630 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
631 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700632 /* leave es->s_feature_*compat flags alone */
633 /* es->s_uuid will be set by e2fsck if empty */
634
635 /*
636 * The rest of the superblock fields should be zero, and if not it
637 * means they are likely already in use, so leave them alone. We
638 * can leave it up to e2fsck to clean up any inconsistencies there.
639 */
640}
641
642/*
643 * Open the external journal device
644 */
Eric Sandeenb31e1552009-06-04 17:36:36 -0400645static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700646{
647 struct block_device *bdev;
648 char b[BDEVNAME_SIZE];
649
650 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
651 if (IS_ERR(bdev))
652 goto fail;
653 return bdev;
654
655fail:
Eric Sandeenb31e1552009-06-04 17:36:36 -0400656 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700657 __bdevname(dev, b), PTR_ERR(bdev));
658 return NULL;
659}
660
661/*
662 * Release the journal device
663 */
Mingming Cao617ba132006-10-11 01:20:53 -0700664static int ext4_blkdev_put(struct block_device *bdev)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700665{
666 bd_release(bdev);
Al Viro9a1c3542008-02-22 20:40:24 -0500667 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700668}
669
Mingming Cao617ba132006-10-11 01:20:53 -0700670static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700671{
672 struct block_device *bdev;
673 int ret = -ENODEV;
674
675 bdev = sbi->journal_bdev;
676 if (bdev) {
Mingming Cao617ba132006-10-11 01:20:53 -0700677 ret = ext4_blkdev_put(bdev);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700678 sbi->journal_bdev = NULL;
679 }
680 return ret;
681}
682
683static inline struct inode *orphan_list_entry(struct list_head *l)
684{
Mingming Cao617ba132006-10-11 01:20:53 -0700685 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700686}
687
Mingming Cao617ba132006-10-11 01:20:53 -0700688static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700689{
690 struct list_head *l;
691
Eric Sandeenb31e1552009-06-04 17:36:36 -0400692 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
693 le32_to_cpu(sbi->s_es->s_last_orphan));
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700694
695 printk(KERN_ERR "sb_info orphan list:\n");
696 list_for_each(l, &sbi->s_orphan) {
697 struct inode *inode = orphan_list_entry(l);
698 printk(KERN_ERR " "
699 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
700 inode->i_sb->s_id, inode->i_ino, inode,
701 inode->i_mode, inode->i_nlink,
702 NEXT_ORPHAN(inode));
703 }
704}
705
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400706static void ext4_put_super(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700707{
Mingming Cao617ba132006-10-11 01:20:53 -0700708 struct ext4_sb_info *sbi = EXT4_SB(sb);
709 struct ext4_super_block *es = sbi->s_es;
Hidehiro Kawaief2cabf2008-10-27 22:53:05 -0400710 int i, err;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700711
Lukas Czerner857ac882010-10-27 21:30:05 -0400712 ext4_unregister_li_request(sb);
Christoph Hellwige0ccfd92010-05-19 07:16:42 -0400713 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
714
Mingming Cao4c0425f2009-09-28 15:48:41 -0400715 flush_workqueue(sbi->dio_unwritten_wq);
716 destroy_workqueue(sbi->dio_unwritten_wq);
717
Al Viroa9e220f2009-05-05 22:10:44 -0400718 lock_super(sb);
Christoph Hellwig8c85e122009-04-28 18:00:26 +0200719 if (sb->s_dirt)
Christoph Hellwigebc1ac12009-05-11 23:35:03 +0200720 ext4_commit_super(sb, 1);
Christoph Hellwig8c85e122009-04-28 18:00:26 +0200721
Frank Mayhar03901312009-01-07 00:06:22 -0500722 if (sbi->s_journal) {
723 err = jbd2_journal_destroy(sbi->s_journal);
724 sbi->s_journal = NULL;
725 if (err < 0)
Theodore Ts'oc67d8592010-06-29 11:07:07 -0400726 ext4_abort(sb, "Couldn't clean up the journal");
Frank Mayhar03901312009-01-07 00:06:22 -0500727 }
Josef Bacikd4edac32009-12-08 21:48:58 -0500728
Sergey Senozhatskya1c6c562010-10-27 21:30:04 -0400729 del_timer(&sbi->s_err_report);
Josef Bacikd4edac32009-12-08 21:48:58 -0500730 ext4_release_system_zone(sb);
731 ext4_mb_release(sb);
732 ext4_ext_release(sb);
733 ext4_xattr_put_super(sb);
734
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700735 if (!(sb->s_flags & MS_RDONLY)) {
Mingming Cao617ba132006-10-11 01:20:53 -0700736 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700737 es->s_state = cpu_to_le16(sbi->s_mount_state);
Theodore Ts'oe2d67052009-05-01 00:33:44 -0400738 ext4_commit_super(sb, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700739 }
Theodore Ts'o240799c2008-10-09 23:53:47 -0400740 if (sbi->s_proc) {
Theodore Ts'o9f6200b2008-09-23 09:18:24 -0400741 remove_proc_entry(sb->s_id, ext4_proc_root);
Theodore Ts'o240799c2008-10-09 23:53:47 -0400742 }
Theodore Ts'o3197ebd2009-03-31 09:10:09 -0400743 kobject_del(&sbi->s_kobj);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700744
745 for (i = 0; i < sbi->s_gdb_count; i++)
746 brelse(sbi->s_group_desc[i]);
747 kfree(sbi->s_group_desc);
Theodore Ts'oc5ca7c72009-04-27 22:48:48 -0400748 if (is_vmalloc_addr(sbi->s_flex_groups))
749 vfree(sbi->s_flex_groups);
750 else
751 kfree(sbi->s_flex_groups);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700752 percpu_counter_destroy(&sbi->s_freeblocks_counter);
753 percpu_counter_destroy(&sbi->s_freeinodes_counter);
754 percpu_counter_destroy(&sbi->s_dirs_counter);
Aneesh Kumar K.V6bc6e632008-10-10 09:39:00 -0400755 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700756 brelse(sbi->s_sbh);
757#ifdef CONFIG_QUOTA
758 for (i = 0; i < MAXQUOTAS; i++)
759 kfree(sbi->s_qf_names[i]);
760#endif
761
762 /* Debugging code just in case the in-memory inode orphan list
763 * isn't empty. The on-disk one can be non-empty if we've
764 * detected an error and taken the fs readonly, but the
765 * in-memory list had better be clean by this point. */
766 if (!list_empty(&sbi->s_orphan))
767 dump_orphan_list(sb, sbi);
768 J_ASSERT(list_empty(&sbi->s_orphan));
769
Peter Zijlstraf98393a2007-05-06 14:49:54 -0700770 invalidate_bdev(sb->s_bdev);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700771 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
772 /*
773 * Invalidate the journal device's buffers. We don't want them
774 * floating about in memory - the physical journal device may
775 * hotswapped, and it breaks the `ro-after' testing code.
776 */
777 sync_blockdev(sbi->journal_bdev);
Peter Zijlstraf98393a2007-05-06 14:49:54 -0700778 invalidate_bdev(sbi->journal_bdev);
Mingming Cao617ba132006-10-11 01:20:53 -0700779 ext4_blkdev_remove(sbi);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700780 }
781 sb->s_fs_info = NULL;
Theodore Ts'o3197ebd2009-03-31 09:10:09 -0400782 /*
783 * Now that we are completely done shutting down the
784 * superblock, we need to actually destroy the kobject.
785 */
Theodore Ts'o3197ebd2009-03-31 09:10:09 -0400786 unlock_super(sb);
787 kobject_put(&sbi->s_kobj);
788 wait_for_completion(&sbi->s_kobj_unregister);
Pekka Enberg705895b2009-02-15 18:07:52 -0500789 kfree(sbi->s_blockgroup_lock);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700790 kfree(sbi);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700791}
792
Christoph Lametere18b8902006-12-06 20:33:20 -0800793static struct kmem_cache *ext4_inode_cachep;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700794
795/*
796 * Called inside transaction, so use GFP_NOFS
797 */
Mingming Cao617ba132006-10-11 01:20:53 -0700798static struct inode *ext4_alloc_inode(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700799{
Mingming Cao617ba132006-10-11 01:20:53 -0700800 struct ext4_inode_info *ei;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700801
Christoph Lametere6b4f8d2006-12-06 20:33:14 -0800802 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700803 if (!ei)
804 return NULL;
Andreas Dilger0b8e58a2009-06-03 17:59:28 -0400805
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700806 ei->vfs_inode.i_version = 1;
Aneesh Kumar K.V91246c02008-08-19 21:14:52 -0400807 ei->vfs_inode.i_data.writeback_index = 0;
Alex Tomasa86c6182006-10-11 01:21:03 -0700808 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
Alex Tomasc9de5602008-01-29 00:19:52 -0500809 INIT_LIST_HEAD(&ei->i_prealloc_list);
810 spin_lock_init(&ei->i_prealloc_lock);
Frank Mayhar03901312009-01-07 00:06:22 -0500811 /*
812 * Note: We can be called before EXT4_SB(sb)->s_journal is set,
813 * therefore it can be null here. Don't check it, just initialize
814 * jinode.
815 */
Jan Kara678aaf42008-07-11 19:27:31 -0400816 jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode);
Mingming Caod2a17632008-07-14 17:52:37 -0400817 ei->i_reserved_data_blocks = 0;
818 ei->i_reserved_meta_blocks = 0;
819 ei->i_allocated_meta_blocks = 0;
Theodore Ts'o9d0be502010-01-01 02:41:30 -0500820 ei->i_da_metadata_calc_len = 0;
Mingming Caod2a17632008-07-14 17:52:37 -0400821 ei->i_delalloc_reserved_flag = 0;
822 spin_lock_init(&(ei->i_block_reservation_lock));
Dmitry Monakhova9e7f442009-12-14 15:21:14 +0300823#ifdef CONFIG_QUOTA
824 ei->i_reserved_quota = 0;
825#endif
Jiaying Zhangc7064ef2010-03-02 13:28:44 -0500826 INIT_LIST_HEAD(&ei->i_completed_io_list);
Jiaying Zhang744692d2010-03-04 16:14:02 -0500827 spin_lock_init(&ei->i_completed_io_lock);
Mingming Cao8d5d02e2009-09-28 15:48:29 -0400828 ei->cur_aio_dio = NULL;
Jan Karab436b9b2009-12-08 23:51:10 -0500829 ei->i_sync_tid = 0;
830 ei->i_datasync_tid = 0;
Theodore Ts'of7ad6d22010-11-08 13:43:33 -0500831 atomic_set(&ei->i_ioend_count, 0);
Andreas Dilger0b8e58a2009-06-03 17:59:28 -0400832
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700833 return &ei->vfs_inode;
834}
835
Theodore Ts'o7ff9c072010-11-08 13:51:33 -0500836static int ext4_drop_inode(struct inode *inode)
837{
838 int drop = generic_drop_inode(inode);
839
840 trace_ext4_drop_inode(inode, drop);
841 return drop;
842}
843
Mingming Cao617ba132006-10-11 01:20:53 -0700844static void ext4_destroy_inode(struct inode *inode)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700845{
Theodore Ts'of7ad6d22010-11-08 13:43:33 -0500846 ext4_ioend_wait(inode);
Vasily Averin9f7dd932007-07-15 23:40:45 -0700847 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
Eric Sandeenb31e1552009-06-04 17:36:36 -0400848 ext4_msg(inode->i_sb, KERN_ERR,
849 "Inode %lu (%p): orphan list check failed!",
850 inode->i_ino, EXT4_I(inode));
Vasily Averin9f7dd932007-07-15 23:40:45 -0700851 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
852 EXT4_I(inode), sizeof(struct ext4_inode_info),
853 true);
854 dump_stack();
855 }
Mingming Cao617ba132006-10-11 01:20:53 -0700856 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700857}
858
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700859static void init_once(void *foo)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700860{
Mingming Cao617ba132006-10-11 01:20:53 -0700861 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700862
Christoph Lametera35afb82007-05-16 22:10:57 -0700863 INIT_LIST_HEAD(&ei->i_orphan);
Theodore Ts'o03010a32008-10-10 20:02:48 -0400864#ifdef CONFIG_EXT4_FS_XATTR
Christoph Lametera35afb82007-05-16 22:10:57 -0700865 init_rwsem(&ei->xattr_sem);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700866#endif
Aneesh Kumar K.V0e855ac2008-01-28 23:58:26 -0500867 init_rwsem(&ei->i_data_sem);
Christoph Lametera35afb82007-05-16 22:10:57 -0700868 inode_init_once(&ei->vfs_inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700869}
870
871static int init_inodecache(void)
872{
Mingming Cao617ba132006-10-11 01:20:53 -0700873 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
874 sizeof(struct ext4_inode_info),
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700875 0, (SLAB_RECLAIM_ACCOUNT|
876 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900877 init_once);
Mingming Cao617ba132006-10-11 01:20:53 -0700878 if (ext4_inode_cachep == NULL)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700879 return -ENOMEM;
880 return 0;
881}
882
883static void destroy_inodecache(void)
884{
Mingming Cao617ba132006-10-11 01:20:53 -0700885 kmem_cache_destroy(ext4_inode_cachep);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700886}
887
Al Viro0930fcc2010-06-07 13:16:22 -0400888void ext4_clear_inode(struct inode *inode)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700889{
Al Viro0930fcc2010-06-07 13:16:22 -0400890 invalidate_inode_buffers(inode);
891 end_writeback(inode);
Christoph Hellwig9f754752010-03-03 09:05:05 -0500892 dquot_drop(inode);
Theodore Ts'oc2ea3fd2008-10-10 09:40:52 -0400893 ext4_discard_preallocations(inode);
Frank Mayhar03901312009-01-07 00:06:22 -0500894 if (EXT4_JOURNAL(inode))
895 jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal,
Jan Kara678aaf42008-07-11 19:27:31 -0400896 &EXT4_I(inode)->jinode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700897}
898
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400899static inline void ext4_show_quota_options(struct seq_file *seq,
900 struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700901{
902#if defined(CONFIG_QUOTA)
Mingming Cao617ba132006-10-11 01:20:53 -0700903 struct ext4_sb_info *sbi = EXT4_SB(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700904
Jan Kara5a20bdf2009-11-30 23:58:32 +0100905 if (sbi->s_jquota_fmt) {
906 char *fmtname = "";
907
908 switch (sbi->s_jquota_fmt) {
909 case QFMT_VFS_OLD:
910 fmtname = "vfsold";
911 break;
912 case QFMT_VFS_V0:
913 fmtname = "vfsv0";
914 break;
915 case QFMT_VFS_V1:
916 fmtname = "vfsv1";
917 break;
918 }
919 seq_printf(seq, ",jqfmt=%s", fmtname);
920 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700921
922 if (sbi->s_qf_names[USRQUOTA])
923 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
924
925 if (sbi->s_qf_names[GRPQUOTA])
926 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
927
Dmitry Monakhov482a7422010-02-24 11:35:32 -0500928 if (test_opt(sb, USRQUOTA))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700929 seq_puts(seq, ",usrquota");
930
Dmitry Monakhov482a7422010-02-24 11:35:32 -0500931 if (test_opt(sb, GRPQUOTA))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700932 seq_puts(seq, ",grpquota");
933#endif
934}
935
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700936/*
937 * Show an option if
938 * - it's set to a non-default value OR
939 * - if the per-sb default is different from the global default
940 */
Mingming Cao617ba132006-10-11 01:20:53 -0700941static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700942{
Aneesh Kumar K.Vaa22df22008-01-28 23:58:27 -0500943 int def_errors;
944 unsigned long def_mount_opts;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700945 struct super_block *sb = vfs->mnt_sb;
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700946 struct ext4_sb_info *sbi = EXT4_SB(sb);
947 struct ext4_super_block *es = sbi->s_es;
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700948
949 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
Aneesh Kumar K.Vaa22df22008-01-28 23:58:27 -0500950 def_errors = le16_to_cpu(es->s_errors);
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700951
952 if (sbi->s_sb_block != 1)
953 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
954 if (test_opt(sb, MINIX_DF))
955 seq_puts(seq, ",minixdf");
Aneesh Kumar K.Vaa22df22008-01-28 23:58:27 -0500956 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700957 seq_puts(seq, ",grpid");
958 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
959 seq_puts(seq, ",nogrpid");
960 if (sbi->s_resuid != EXT4_DEF_RESUID ||
961 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
962 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
963 }
964 if (sbi->s_resgid != EXT4_DEF_RESGID ||
965 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
966 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
967 }
Aneesh Kumar K.Vbb4f3972008-01-28 23:58:26 -0500968 if (test_opt(sb, ERRORS_RO)) {
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700969 if (def_errors == EXT4_ERRORS_PANIC ||
Aneesh Kumar K.Vbb4f3972008-01-28 23:58:26 -0500970 def_errors == EXT4_ERRORS_CONTINUE) {
971 seq_puts(seq, ",errors=remount-ro");
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700972 }
973 }
Aneesh Kumar K.Vaa22df22008-01-28 23:58:27 -0500974 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
Aneesh Kumar K.Vbb4f3972008-01-28 23:58:26 -0500975 seq_puts(seq, ",errors=continue");
Aneesh Kumar K.Vaa22df22008-01-28 23:58:27 -0500976 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700977 seq_puts(seq, ",errors=panic");
Aneesh Kumar K.Vaa22df22008-01-28 23:58:27 -0500978 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700979 seq_puts(seq, ",nouid32");
Aneesh Kumar K.Vaa22df22008-01-28 23:58:27 -0500980 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700981 seq_puts(seq, ",debug");
982 if (test_opt(sb, OLDALLOC))
983 seq_puts(seq, ",oldalloc");
Theodore Ts'o03010a32008-10-10 20:02:48 -0400984#ifdef CONFIG_EXT4_FS_XATTR
Aneesh Kumar K.Vaa22df22008-01-28 23:58:27 -0500985 if (test_opt(sb, XATTR_USER) &&
986 !(def_mount_opts & EXT4_DEFM_XATTR_USER))
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700987 seq_puts(seq, ",user_xattr");
988 if (!test_opt(sb, XATTR_USER) &&
989 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
990 seq_puts(seq, ",nouser_xattr");
991 }
992#endif
Theodore Ts'o03010a32008-10-10 20:02:48 -0400993#ifdef CONFIG_EXT4_FS_POSIX_ACL
Aneesh Kumar K.Vaa22df22008-01-28 23:58:27 -0500994 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700995 seq_puts(seq, ",acl");
996 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
997 seq_puts(seq, ",noacl");
998#endif
Theodore Ts'o30773842009-01-03 20:27:38 -0500999 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
Miklos Szeredid9c9bef12007-10-16 23:26:27 -07001000 seq_printf(seq, ",commit=%u",
1001 (unsigned) (sbi->s_commit_interval / HZ));
1002 }
Theodore Ts'o30773842009-01-03 20:27:38 -05001003 if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) {
1004 seq_printf(seq, ",min_batch_time=%u",
1005 (unsigned) sbi->s_min_batch_time);
1006 }
1007 if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) {
1008 seq_printf(seq, ",max_batch_time=%u",
1009 (unsigned) sbi->s_min_batch_time);
1010 }
1011
Eric Sandeen571640c2008-05-26 12:29:46 -04001012 /*
1013 * We're changing the default of barrier mount option, so
1014 * let's always display its mount state so it's clear what its
1015 * status is.
1016 */
1017 seq_puts(seq, ",barrier=");
1018 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
Theodore Ts'ocd0b6a32008-05-26 10:28:28 -04001019 if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
1020 seq_puts(seq, ",journal_async_commit");
Jan Kara39a4bad2010-05-16 17:00:00 -04001021 else if (test_opt(sb, JOURNAL_CHECKSUM))
1022 seq_puts(seq, ",journal_checksum");
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -05001023 if (test_opt(sb, I_VERSION))
1024 seq_puts(seq, ",i_version");
Theodore Ts'o8b67f042010-08-01 23:14:20 -04001025 if (!test_opt(sb, DELALLOC) &&
1026 !(def_mount_opts & EXT4_DEFM_NODELALLOC))
Aneesh Kumar K.Vdd919b92008-07-11 19:27:31 -04001027 seq_puts(seq, ",nodelalloc");
1028
Theodore Ts'o14490322010-12-14 15:27:50 -05001029 if (test_opt(sb, MBLK_IO_SUBMIT))
1030 seq_puts(seq, ",mblk_io_submit");
Miklos Szeredicb45bbe2008-01-28 23:58:27 -05001031 if (sbi->s_stripe)
1032 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
Aneesh Kumar K.Vaa22df22008-01-28 23:58:27 -05001033 /*
1034 * journal mode get enabled in different ways
1035 * So just print the value even if we didn't specify it
1036 */
Mingming Cao617ba132006-10-11 01:20:53 -07001037 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001038 seq_puts(seq, ",data=journal");
Mingming Cao617ba132006-10-11 01:20:53 -07001039 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001040 seq_puts(seq, ",data=ordered");
Mingming Cao617ba132006-10-11 01:20:53 -07001041 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001042 seq_puts(seq, ",data=writeback");
1043
Theodore Ts'o240799c2008-10-09 23:53:47 -04001044 if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
1045 seq_printf(seq, ",inode_readahead_blks=%u",
1046 sbi->s_inode_readahead_blks);
1047
Hidehiro Kawai5bf56832008-10-10 22:12:43 -04001048 if (test_opt(sb, DATA_ERR_ABORT))
1049 seq_puts(seq, ",data_err=abort");
1050
Theodore Ts'oafd46722009-03-16 23:12:23 -04001051 if (test_opt(sb, NO_AUTO_DA_ALLOC))
Theodore Ts'o06705bf2009-03-28 10:59:57 -04001052 seq_puts(seq, ",noauto_da_alloc");
Theodore Ts'oafd46722009-03-16 23:12:23 -04001053
Theodore Ts'o8b67f042010-08-01 23:14:20 -04001054 if (test_opt(sb, DISCARD) && !(def_mount_opts & EXT4_DEFM_DISCARD))
Eric Sandeen5328e632009-11-19 14:25:42 -05001055 seq_puts(seq, ",discard");
1056
Eric Sandeene3bb52a2009-11-19 14:28:50 -05001057 if (test_opt(sb, NOLOAD))
1058 seq_puts(seq, ",norecovery");
1059
Jiaying Zhang744692d2010-03-04 16:14:02 -05001060 if (test_opt(sb, DIOREAD_NOLOCK))
1061 seq_puts(seq, ",dioread_nolock");
1062
Theodore Ts'o8b67f042010-08-01 23:14:20 -04001063 if (test_opt(sb, BLOCK_VALIDITY) &&
1064 !(def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY))
1065 seq_puts(seq, ",block_validity");
1066
Lukas Czernerbfff6872010-10-27 21:30:05 -04001067 if (!test_opt(sb, INIT_INODE_TABLE))
1068 seq_puts(seq, ",noinit_inode_table");
1069 else if (sbi->s_li_wait_mult)
1070 seq_printf(seq, ",init_inode_table=%u",
1071 (unsigned) sbi->s_li_wait_mult);
1072
Mingming Cao617ba132006-10-11 01:20:53 -07001073 ext4_show_quota_options(seq, sb);
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04001074
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001075 return 0;
1076}
1077
Christoph Hellwig1b961ac2007-10-21 16:42:08 -07001078static struct inode *ext4_nfs_get_inode(struct super_block *sb,
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04001079 u64 ino, u32 generation)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001080{
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001081 struct inode *inode;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001082
Mingming Cao617ba132006-10-11 01:20:53 -07001083 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001084 return ERR_PTR(-ESTALE);
Mingming Cao617ba132006-10-11 01:20:53 -07001085 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001086 return ERR_PTR(-ESTALE);
1087
1088 /* iget isn't really right if the inode is currently unallocated!!
1089 *
Mingming Cao617ba132006-10-11 01:20:53 -07001090 * ext4_read_inode will return a bad_inode if the inode had been
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001091 * deleted, so we should be safe.
1092 *
1093 * Currently we don't know the generation for parent directory, so
1094 * a generation of 0 means "accept any"
1095 */
David Howells1d1fe1e2008-02-07 00:15:37 -08001096 inode = ext4_iget(sb, ino);
1097 if (IS_ERR(inode))
1098 return ERR_CAST(inode);
1099 if (generation && inode->i_generation != generation) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001100 iput(inode);
1101 return ERR_PTR(-ESTALE);
1102 }
Christoph Hellwig1b961ac2007-10-21 16:42:08 -07001103
1104 return inode;
1105}
1106
1107static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04001108 int fh_len, int fh_type)
Christoph Hellwig1b961ac2007-10-21 16:42:08 -07001109{
1110 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1111 ext4_nfs_get_inode);
1112}
1113
1114static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04001115 int fh_len, int fh_type)
Christoph Hellwig1b961ac2007-10-21 16:42:08 -07001116{
1117 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1118 ext4_nfs_get_inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001119}
1120
Toshiyuki Okajimac39a7f82009-01-05 22:38:48 -05001121/*
1122 * Try to release metadata pages (indirect blocks, directories) which are
1123 * mapped via the block device. Since these pages could have journal heads
1124 * which would prevent try_to_free_buffers() from freeing them, we must use
1125 * jbd2 layer's try_to_free_buffers() function to release them.
1126 */
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04001127static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1128 gfp_t wait)
Toshiyuki Okajimac39a7f82009-01-05 22:38:48 -05001129{
1130 journal_t *journal = EXT4_SB(sb)->s_journal;
1131
1132 WARN_ON(PageChecked(page));
1133 if (!page_has_buffers(page))
1134 return 0;
1135 if (journal)
1136 return jbd2_journal_try_to_free_buffers(journal, page,
1137 wait & ~__GFP_WAIT);
1138 return try_to_free_buffers(page);
1139}
1140
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001141#ifdef CONFIG_QUOTA
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001142#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001143#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001144
Mingming Cao617ba132006-10-11 01:20:53 -07001145static int ext4_write_dquot(struct dquot *dquot);
1146static int ext4_acquire_dquot(struct dquot *dquot);
1147static int ext4_release_dquot(struct dquot *dquot);
1148static int ext4_mark_dquot_dirty(struct dquot *dquot);
1149static int ext4_write_info(struct super_block *sb, int type);
Jan Kara6f28e082008-04-28 02:14:34 -07001150static int ext4_quota_on(struct super_block *sb, int type, int format_id,
Christoph Hellwig307ae182010-05-19 07:16:43 -04001151 char *path);
Dmitry Monakhovca0e05e2010-08-01 17:48:36 -04001152static int ext4_quota_off(struct super_block *sb, int type);
Mingming Cao617ba132006-10-11 01:20:53 -07001153static int ext4_quota_on_mount(struct super_block *sb, int type);
1154static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001155 size_t len, loff_t off);
Mingming Cao617ba132006-10-11 01:20:53 -07001156static ssize_t ext4_quota_write(struct super_block *sb, int type,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001157 const char *data, size_t len, loff_t off);
1158
Alexey Dobriyan61e225d2009-09-21 17:01:08 -07001159static const struct dquot_operations ext4_quota_operations = {
Dmitry Monakhova9e7f442009-12-14 15:21:14 +03001160#ifdef CONFIG_QUOTA
Mingming Cao60e58e02009-01-22 18:13:05 +01001161 .get_reserved_space = ext4_get_reserved_space,
Dmitry Monakhova9e7f442009-12-14 15:21:14 +03001162#endif
Mingming Cao617ba132006-10-11 01:20:53 -07001163 .write_dquot = ext4_write_dquot,
1164 .acquire_dquot = ext4_acquire_dquot,
1165 .release_dquot = ext4_release_dquot,
1166 .mark_dirty = ext4_mark_dquot_dirty,
Jan Karaa5b5ee32008-11-25 15:31:35 +01001167 .write_info = ext4_write_info,
1168 .alloc_dquot = dquot_alloc,
1169 .destroy_dquot = dquot_destroy,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001170};
1171
Alexey Dobriyan0d54b212009-09-21 17:01:09 -07001172static const struct quotactl_ops ext4_qctl_operations = {
Mingming Cao617ba132006-10-11 01:20:53 -07001173 .quota_on = ext4_quota_on,
Dmitry Monakhovca0e05e2010-08-01 17:48:36 -04001174 .quota_off = ext4_quota_off,
Christoph Hellwig287a8092010-05-19 07:16:45 -04001175 .quota_sync = dquot_quota_sync,
1176 .get_info = dquot_get_dqinfo,
1177 .set_info = dquot_set_dqinfo,
1178 .get_dqblk = dquot_get_dqblk,
1179 .set_dqblk = dquot_set_dqblk
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001180};
1181#endif
1182
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -08001183static const struct super_operations ext4_sops = {
Mingming Cao617ba132006-10-11 01:20:53 -07001184 .alloc_inode = ext4_alloc_inode,
1185 .destroy_inode = ext4_destroy_inode,
Mingming Cao617ba132006-10-11 01:20:53 -07001186 .write_inode = ext4_write_inode,
1187 .dirty_inode = ext4_dirty_inode,
Theodore Ts'o7ff9c072010-11-08 13:51:33 -05001188 .drop_inode = ext4_drop_inode,
Al Viro0930fcc2010-06-07 13:16:22 -04001189 .evict_inode = ext4_evict_inode,
Mingming Cao617ba132006-10-11 01:20:53 -07001190 .put_super = ext4_put_super,
Mingming Cao617ba132006-10-11 01:20:53 -07001191 .sync_fs = ext4_sync_fs,
Takashi Satoc4be0c12009-01-09 16:40:58 -08001192 .freeze_fs = ext4_freeze,
1193 .unfreeze_fs = ext4_unfreeze,
Mingming Cao617ba132006-10-11 01:20:53 -07001194 .statfs = ext4_statfs,
1195 .remount_fs = ext4_remount,
Mingming Cao617ba132006-10-11 01:20:53 -07001196 .show_options = ext4_show_options,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001197#ifdef CONFIG_QUOTA
Mingming Cao617ba132006-10-11 01:20:53 -07001198 .quota_read = ext4_quota_read,
1199 .quota_write = ext4_quota_write,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001200#endif
Toshiyuki Okajimac39a7f82009-01-05 22:38:48 -05001201 .bdev_try_to_free_page = bdev_try_to_free_page,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001202};
1203
Theodore Ts'o9ca92382009-05-01 12:52:25 -04001204static const struct super_operations ext4_nojournal_sops = {
1205 .alloc_inode = ext4_alloc_inode,
1206 .destroy_inode = ext4_destroy_inode,
1207 .write_inode = ext4_write_inode,
1208 .dirty_inode = ext4_dirty_inode,
Theodore Ts'o7ff9c072010-11-08 13:51:33 -05001209 .drop_inode = ext4_drop_inode,
Al Viro0930fcc2010-06-07 13:16:22 -04001210 .evict_inode = ext4_evict_inode,
Theodore Ts'o9ca92382009-05-01 12:52:25 -04001211 .write_super = ext4_write_super,
1212 .put_super = ext4_put_super,
1213 .statfs = ext4_statfs,
1214 .remount_fs = ext4_remount,
Theodore Ts'o9ca92382009-05-01 12:52:25 -04001215 .show_options = ext4_show_options,
1216#ifdef CONFIG_QUOTA
1217 .quota_read = ext4_quota_read,
1218 .quota_write = ext4_quota_write,
1219#endif
1220 .bdev_try_to_free_page = bdev_try_to_free_page,
1221};
1222
Christoph Hellwig39655162007-10-21 16:42:17 -07001223static const struct export_operations ext4_export_ops = {
Christoph Hellwig1b961ac2007-10-21 16:42:08 -07001224 .fh_to_dentry = ext4_fh_to_dentry,
1225 .fh_to_parent = ext4_fh_to_parent,
Mingming Cao617ba132006-10-11 01:20:53 -07001226 .get_parent = ext4_get_parent,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001227};
1228
1229enum {
1230 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1231 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
Theodore Ts'o01436ef2008-10-17 07:22:35 -04001232 Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001233 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
Theodore Ts'o06705bf2009-03-28 10:59:57 -04001234 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, Opt_nobh, Opt_bh,
Theodore Ts'o30773842009-01-03 20:27:38 -05001235 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
Theodore Ts'oc3191062009-01-06 11:14:25 -05001236 Opt_journal_update, Opt_journal_dev,
Girish Shilamkar818d2762008-01-28 23:58:27 -05001237 Opt_journal_checksum, Opt_journal_async_commit,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001238 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
Theodore Ts'o296c3552009-09-30 00:32:42 -04001239 Opt_data_err_abort, Opt_data_err_ignore,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001240 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
Jan Kara5a20bdf2009-11-30 23:58:32 +01001241 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
1242 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
1243 Opt_resize, Opt_usrquota, Opt_grpquota, Opt_i_version,
Theodore Ts'o14490322010-12-14 15:27:50 -05001244 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1245 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
Eric Sandeen5328e632009-11-19 14:25:42 -05001246 Opt_inode_readahead_blks, Opt_journal_ioprio,
Jiaying Zhang744692d2010-03-04 16:14:02 -05001247 Opt_dioread_nolock, Opt_dioread_lock,
Eric Sandeen5328e632009-11-19 14:25:42 -05001248 Opt_discard, Opt_nodiscard,
Lukas Czernerbfff6872010-10-27 21:30:05 -04001249 Opt_init_inode_table, Opt_noinit_inode_table,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001250};
1251
Steven Whitehousea447c092008-10-13 10:46:57 +01001252static const match_table_t tokens = {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001253 {Opt_bsd_df, "bsddf"},
1254 {Opt_minix_df, "minixdf"},
1255 {Opt_grpid, "grpid"},
1256 {Opt_grpid, "bsdgroups"},
1257 {Opt_nogrpid, "nogrpid"},
1258 {Opt_nogrpid, "sysvgroups"},
1259 {Opt_resgid, "resgid=%u"},
1260 {Opt_resuid, "resuid=%u"},
1261 {Opt_sb, "sb=%u"},
1262 {Opt_err_cont, "errors=continue"},
1263 {Opt_err_panic, "errors=panic"},
1264 {Opt_err_ro, "errors=remount-ro"},
1265 {Opt_nouid32, "nouid32"},
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001266 {Opt_debug, "debug"},
1267 {Opt_oldalloc, "oldalloc"},
1268 {Opt_orlov, "orlov"},
1269 {Opt_user_xattr, "user_xattr"},
1270 {Opt_nouser_xattr, "nouser_xattr"},
1271 {Opt_acl, "acl"},
1272 {Opt_noacl, "noacl"},
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001273 {Opt_noload, "noload"},
Eric Sandeene3bb52a2009-11-19 14:28:50 -05001274 {Opt_noload, "norecovery"},
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001275 {Opt_nobh, "nobh"},
1276 {Opt_bh, "bh"},
1277 {Opt_commit, "commit=%u"},
Theodore Ts'o30773842009-01-03 20:27:38 -05001278 {Opt_min_batch_time, "min_batch_time=%u"},
1279 {Opt_max_batch_time, "max_batch_time=%u"},
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001280 {Opt_journal_update, "journal=update"},
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001281 {Opt_journal_dev, "journal_dev=%u"},
Girish Shilamkar818d2762008-01-28 23:58:27 -05001282 {Opt_journal_checksum, "journal_checksum"},
1283 {Opt_journal_async_commit, "journal_async_commit"},
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001284 {Opt_abort, "abort"},
1285 {Opt_data_journal, "data=journal"},
1286 {Opt_data_ordered, "data=ordered"},
1287 {Opt_data_writeback, "data=writeback"},
Hidehiro Kawai5bf56832008-10-10 22:12:43 -04001288 {Opt_data_err_abort, "data_err=abort"},
1289 {Opt_data_err_ignore, "data_err=ignore"},
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001290 {Opt_offusrjquota, "usrjquota="},
1291 {Opt_usrjquota, "usrjquota=%s"},
1292 {Opt_offgrpjquota, "grpjquota="},
1293 {Opt_grpjquota, "grpjquota=%s"},
1294 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1295 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
Jan Kara5a20bdf2009-11-30 23:58:32 +01001296 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001297 {Opt_grpquota, "grpquota"},
1298 {Opt_noquota, "noquota"},
1299 {Opt_quota, "quota"},
1300 {Opt_usrquota, "usrquota"},
1301 {Opt_barrier, "barrier=%u"},
Theodore Ts'o06705bf2009-03-28 10:59:57 -04001302 {Opt_barrier, "barrier"},
1303 {Opt_nobarrier, "nobarrier"},
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -05001304 {Opt_i_version, "i_version"},
Alex Tomasc9de5602008-01-29 00:19:52 -05001305 {Opt_stripe, "stripe=%u"},
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001306 {Opt_resize, "resize"},
Alex Tomas64769242008-07-11 19:27:31 -04001307 {Opt_delalloc, "delalloc"},
Aneesh Kumar K.Vdd919b92008-07-11 19:27:31 -04001308 {Opt_nodelalloc, "nodelalloc"},
Theodore Ts'o14490322010-12-14 15:27:50 -05001309 {Opt_mblk_io_submit, "mblk_io_submit"},
1310 {Opt_nomblk_io_submit, "nomblk_io_submit"},
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04001311 {Opt_block_validity, "block_validity"},
1312 {Opt_noblock_validity, "noblock_validity"},
Theodore Ts'o240799c2008-10-09 23:53:47 -04001313 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
Theodore Ts'ob3881f72009-01-05 22:46:26 -05001314 {Opt_journal_ioprio, "journal_ioprio=%u"},
Theodore Ts'oafd46722009-03-16 23:12:23 -04001315 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
Theodore Ts'o06705bf2009-03-28 10:59:57 -04001316 {Opt_auto_da_alloc, "auto_da_alloc"},
1317 {Opt_noauto_da_alloc, "noauto_da_alloc"},
Jiaying Zhang744692d2010-03-04 16:14:02 -05001318 {Opt_dioread_nolock, "dioread_nolock"},
1319 {Opt_dioread_lock, "dioread_lock"},
Eric Sandeen5328e632009-11-19 14:25:42 -05001320 {Opt_discard, "discard"},
1321 {Opt_nodiscard, "nodiscard"},
Lukas Czernerbfff6872010-10-27 21:30:05 -04001322 {Opt_init_inode_table, "init_itable=%u"},
1323 {Opt_init_inode_table, "init_itable"},
1324 {Opt_noinit_inode_table, "noinit_itable"},
Josef Bacikf3f12fa2008-04-29 22:05:28 -04001325 {Opt_err, NULL},
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001326};
1327
Mingming Cao617ba132006-10-11 01:20:53 -07001328static ext4_fsblk_t get_sb_block(void **data)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001329{
Mingming Cao617ba132006-10-11 01:20:53 -07001330 ext4_fsblk_t sb_block;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001331 char *options = (char *) *data;
1332
1333 if (!options || strncmp(options, "sb=", 3) != 0)
1334 return 1; /* Default location */
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04001335
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001336 options += 3;
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04001337 /* TODO: use simple_strtoll with >32bit ext4 */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001338 sb_block = simple_strtoul(options, &options, 0);
1339 if (*options && *options != ',') {
Theodore Ts'o4776004f2008-09-08 23:00:52 -04001340 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001341 (char *) *data);
1342 return 1;
1343 }
1344 if (*options == ',')
1345 options++;
1346 *data = (void *) options;
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04001347
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001348 return sb_block;
1349}
1350
Theodore Ts'ob3881f72009-01-05 22:46:26 -05001351#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
Dmitry Monakhov437ca0f2010-03-01 22:29:21 -05001352static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1353 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
Theodore Ts'ob3881f72009-01-05 22:46:26 -05001354
Dmitry Monakhov56c50f12010-03-01 23:28:41 -05001355#ifdef CONFIG_QUOTA
1356static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1357{
1358 struct ext4_sb_info *sbi = EXT4_SB(sb);
1359 char *qname;
1360
1361 if (sb_any_quota_loaded(sb) &&
1362 !sbi->s_qf_names[qtype]) {
1363 ext4_msg(sb, KERN_ERR,
1364 "Cannot change journaled "
1365 "quota options when quota turned on");
1366 return 0;
1367 }
1368 qname = match_strdup(args);
1369 if (!qname) {
1370 ext4_msg(sb, KERN_ERR,
1371 "Not enough memory for storing quotafile name");
1372 return 0;
1373 }
1374 if (sbi->s_qf_names[qtype] &&
1375 strcmp(sbi->s_qf_names[qtype], qname)) {
1376 ext4_msg(sb, KERN_ERR,
1377 "%s quota file already specified", QTYPE2NAME(qtype));
1378 kfree(qname);
1379 return 0;
1380 }
1381 sbi->s_qf_names[qtype] = qname;
1382 if (strchr(sbi->s_qf_names[qtype], '/')) {
1383 ext4_msg(sb, KERN_ERR,
1384 "quotafile must be on filesystem root");
1385 kfree(sbi->s_qf_names[qtype]);
1386 sbi->s_qf_names[qtype] = NULL;
1387 return 0;
1388 }
1389 set_opt(sbi->s_mount_opt, QUOTA);
1390 return 1;
1391}
1392
1393static int clear_qf_name(struct super_block *sb, int qtype)
1394{
1395
1396 struct ext4_sb_info *sbi = EXT4_SB(sb);
1397
1398 if (sb_any_quota_loaded(sb) &&
1399 sbi->s_qf_names[qtype]) {
1400 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1401 " when quota turned on");
1402 return 0;
1403 }
1404 /*
1405 * The space will be released later when all options are confirmed
1406 * to be correct
1407 */
1408 sbi->s_qf_names[qtype] = NULL;
1409 return 1;
1410}
1411#endif
1412
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001413static int parse_options(char *options, struct super_block *sb,
Theodore Ts'oc3191062009-01-06 11:14:25 -05001414 unsigned long *journal_devnum,
Theodore Ts'ob3881f72009-01-05 22:46:26 -05001415 unsigned int *journal_ioprio,
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001416 ext4_fsblk_t *n_blocks_count, int is_remount)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001417{
Mingming Cao617ba132006-10-11 01:20:53 -07001418 struct ext4_sb_info *sbi = EXT4_SB(sb);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001419 char *p;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001420 substring_t args[MAX_OPT_ARGS];
1421 int data_opt = 0;
1422 int option;
1423#ifdef CONFIG_QUOTA
Dmitry Monakhov56c50f12010-03-01 23:28:41 -05001424 int qfmt;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001425#endif
1426
1427 if (!options)
1428 return 1;
1429
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001430 while ((p = strsep(&options, ",")) != NULL) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001431 int token;
1432 if (!*p)
1433 continue;
1434
Eric Sandeen15121c12010-02-15 20:17:55 -05001435 /*
1436 * Initialize args struct so we know whether arg was
1437 * found; some options take optional arguments.
1438 */
1439 args[0].to = args[0].from = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001440 token = match_token(p, tokens, args);
1441 switch (token) {
1442 case Opt_bsd_df:
Dmitry Monakhov437ca0f2010-03-01 22:29:21 -05001443 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001444 clear_opt(sbi->s_mount_opt, MINIX_DF);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001445 break;
1446 case Opt_minix_df:
Dmitry Monakhov437ca0f2010-03-01 22:29:21 -05001447 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001448 set_opt(sbi->s_mount_opt, MINIX_DF);
Dmitry Monakhov437ca0f2010-03-01 22:29:21 -05001449
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001450 break;
1451 case Opt_grpid:
Dmitry Monakhov437ca0f2010-03-01 22:29:21 -05001452 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001453 set_opt(sbi->s_mount_opt, GRPID);
Dmitry Monakhov437ca0f2010-03-01 22:29:21 -05001454
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001455 break;
1456 case Opt_nogrpid:
Dmitry Monakhov437ca0f2010-03-01 22:29:21 -05001457 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001458 clear_opt(sbi->s_mount_opt, GRPID);
Dmitry Monakhov437ca0f2010-03-01 22:29:21 -05001459
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001460 break;
1461 case Opt_resuid:
1462 if (match_int(&args[0], &option))
1463 return 0;
1464 sbi->s_resuid = option;
1465 break;
1466 case Opt_resgid:
1467 if (match_int(&args[0], &option))
1468 return 0;
1469 sbi->s_resgid = option;
1470 break;
1471 case Opt_sb:
1472 /* handled by get_sb_block() instead of here */
1473 /* *sb_block = match_int(&args[0]); */
1474 break;
1475 case Opt_err_panic:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001476 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1477 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1478 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001479 break;
1480 case Opt_err_ro:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001481 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1482 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1483 set_opt(sbi->s_mount_opt, ERRORS_RO);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001484 break;
1485 case Opt_err_cont:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001486 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1487 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1488 set_opt(sbi->s_mount_opt, ERRORS_CONT);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001489 break;
1490 case Opt_nouid32:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001491 set_opt(sbi->s_mount_opt, NO_UID32);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001492 break;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001493 case Opt_debug:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001494 set_opt(sbi->s_mount_opt, DEBUG);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001495 break;
1496 case Opt_oldalloc:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001497 set_opt(sbi->s_mount_opt, OLDALLOC);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001498 break;
1499 case Opt_orlov:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001500 clear_opt(sbi->s_mount_opt, OLDALLOC);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001501 break;
Theodore Ts'o03010a32008-10-10 20:02:48 -04001502#ifdef CONFIG_EXT4_FS_XATTR
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001503 case Opt_user_xattr:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001504 set_opt(sbi->s_mount_opt, XATTR_USER);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001505 break;
1506 case Opt_nouser_xattr:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001507 clear_opt(sbi->s_mount_opt, XATTR_USER);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001508 break;
1509#else
1510 case Opt_user_xattr:
1511 case Opt_nouser_xattr:
Eric Sandeenb31e1552009-06-04 17:36:36 -04001512 ext4_msg(sb, KERN_ERR, "(no)user_xattr options not supported");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001513 break;
1514#endif
Theodore Ts'o03010a32008-10-10 20:02:48 -04001515#ifdef CONFIG_EXT4_FS_POSIX_ACL
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001516 case Opt_acl:
1517 set_opt(sbi->s_mount_opt, POSIX_ACL);
1518 break;
1519 case Opt_noacl:
1520 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1521 break;
1522#else
1523 case Opt_acl:
1524 case Opt_noacl:
Eric Sandeenb31e1552009-06-04 17:36:36 -04001525 ext4_msg(sb, KERN_ERR, "(no)acl options not supported");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001526 break;
1527#endif
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001528 case Opt_journal_update:
1529 /* @@@ FIXME */
1530 /* Eventually we will want to be able to create
1531 a journal file here. For now, only allow the
1532 user to specify an existing inode to be the
1533 journal file. */
1534 if (is_remount) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04001535 ext4_msg(sb, KERN_ERR,
1536 "Cannot specify journal on remount");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001537 return 0;
1538 }
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001539 set_opt(sbi->s_mount_opt, UPDATE_JOURNAL);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001540 break;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001541 case Opt_journal_dev:
1542 if (is_remount) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04001543 ext4_msg(sb, KERN_ERR,
1544 "Cannot specify journal on remount");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001545 return 0;
1546 }
1547 if (match_int(&args[0], &option))
1548 return 0;
1549 *journal_devnum = option;
1550 break;
Girish Shilamkar818d2762008-01-28 23:58:27 -05001551 case Opt_journal_checksum:
Linus Torvaldsd4da6c92009-11-02 10:15:27 -08001552 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1553 break;
Girish Shilamkar818d2762008-01-28 23:58:27 -05001554 case Opt_journal_async_commit:
1555 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
Linus Torvaldsd4da6c92009-11-02 10:15:27 -08001556 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
Girish Shilamkar818d2762008-01-28 23:58:27 -05001557 break;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001558 case Opt_noload:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001559 set_opt(sbi->s_mount_opt, NOLOAD);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001560 break;
1561 case Opt_commit:
1562 if (match_int(&args[0], &option))
1563 return 0;
1564 if (option < 0)
1565 return 0;
1566 if (option == 0)
Mingming Caocd02ff02007-10-16 18:38:25 -04001567 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001568 sbi->s_commit_interval = HZ * option;
1569 break;
Theodore Ts'o30773842009-01-03 20:27:38 -05001570 case Opt_max_batch_time:
1571 if (match_int(&args[0], &option))
1572 return 0;
1573 if (option < 0)
1574 return 0;
1575 if (option == 0)
1576 option = EXT4_DEF_MAX_BATCH_TIME;
1577 sbi->s_max_batch_time = option;
1578 break;
1579 case Opt_min_batch_time:
1580 if (match_int(&args[0], &option))
1581 return 0;
1582 if (option < 0)
1583 return 0;
1584 sbi->s_min_batch_time = option;
1585 break;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001586 case Opt_data_journal:
Mingming Cao617ba132006-10-11 01:20:53 -07001587 data_opt = EXT4_MOUNT_JOURNAL_DATA;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001588 goto datacheck;
1589 case Opt_data_ordered:
Mingming Cao617ba132006-10-11 01:20:53 -07001590 data_opt = EXT4_MOUNT_ORDERED_DATA;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001591 goto datacheck;
1592 case Opt_data_writeback:
Mingming Cao617ba132006-10-11 01:20:53 -07001593 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001594 datacheck:
1595 if (is_remount) {
Dmitry Monakhov482a7422010-02-24 11:35:32 -05001596 if (test_opt(sb, DATA_FLAGS) != data_opt) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04001597 ext4_msg(sb, KERN_ERR,
1598 "Cannot change data mode on remount");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001599 return 0;
1600 }
1601 } else {
Dmitry Monakhov482a7422010-02-24 11:35:32 -05001602 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001603 sbi->s_mount_opt |= data_opt;
1604 }
1605 break;
Hidehiro Kawai5bf56832008-10-10 22:12:43 -04001606 case Opt_data_err_abort:
1607 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1608 break;
1609 case Opt_data_err_ignore:
1610 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1611 break;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001612#ifdef CONFIG_QUOTA
1613 case Opt_usrjquota:
Dmitry Monakhov56c50f12010-03-01 23:28:41 -05001614 if (!set_qf_name(sb, USRQUOTA, &args[0]))
1615 return 0;
1616 break;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001617 case Opt_grpjquota:
Dmitry Monakhov56c50f12010-03-01 23:28:41 -05001618 if (!set_qf_name(sb, GRPQUOTA, &args[0]))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001619 return 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001620 break;
1621 case Opt_offusrjquota:
Dmitry Monakhov56c50f12010-03-01 23:28:41 -05001622 if (!clear_qf_name(sb, USRQUOTA))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001623 return 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001624 break;
Dmitry Monakhov56c50f12010-03-01 23:28:41 -05001625 case Opt_offgrpjquota:
1626 if (!clear_qf_name(sb, GRPQUOTA))
1627 return 0;
1628 break;
1629
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001630 case Opt_jqfmt_vfsold:
Jan Karadfc5d032008-05-13 19:11:51 -04001631 qfmt = QFMT_VFS_OLD;
1632 goto set_qf_format;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001633 case Opt_jqfmt_vfsv0:
Jan Karadfc5d032008-05-13 19:11:51 -04001634 qfmt = QFMT_VFS_V0;
Jan Kara5a20bdf2009-11-30 23:58:32 +01001635 goto set_qf_format;
1636 case Opt_jqfmt_vfsv1:
1637 qfmt = QFMT_VFS_V1;
Jan Karadfc5d032008-05-13 19:11:51 -04001638set_qf_format:
Jan Kara17bd13b2008-08-20 18:14:35 +02001639 if (sb_any_quota_loaded(sb) &&
Jan Karadfc5d032008-05-13 19:11:51 -04001640 sbi->s_jquota_fmt != qfmt) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04001641 ext4_msg(sb, KERN_ERR, "Cannot change "
Jan Karadfc5d032008-05-13 19:11:51 -04001642 "journaled quota options when "
Eric Sandeenb31e1552009-06-04 17:36:36 -04001643 "quota turned on");
Jan Karadfc5d032008-05-13 19:11:51 -04001644 return 0;
1645 }
1646 sbi->s_jquota_fmt = qfmt;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001647 break;
1648 case Opt_quota:
1649 case Opt_usrquota:
1650 set_opt(sbi->s_mount_opt, QUOTA);
1651 set_opt(sbi->s_mount_opt, USRQUOTA);
1652 break;
1653 case Opt_grpquota:
1654 set_opt(sbi->s_mount_opt, QUOTA);
1655 set_opt(sbi->s_mount_opt, GRPQUOTA);
1656 break;
1657 case Opt_noquota:
Jan Kara17bd13b2008-08-20 18:14:35 +02001658 if (sb_any_quota_loaded(sb)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04001659 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1660 "options when quota turned on");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001661 return 0;
1662 }
1663 clear_opt(sbi->s_mount_opt, QUOTA);
1664 clear_opt(sbi->s_mount_opt, USRQUOTA);
1665 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1666 break;
1667#else
1668 case Opt_quota:
1669 case Opt_usrquota:
1670 case Opt_grpquota:
Eric Sandeenb31e1552009-06-04 17:36:36 -04001671 ext4_msg(sb, KERN_ERR,
1672 "quota options not supported");
Jan Karacd59e7b2008-05-13 19:11:51 -04001673 break;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001674 case Opt_usrjquota:
1675 case Opt_grpjquota:
1676 case Opt_offusrjquota:
1677 case Opt_offgrpjquota:
1678 case Opt_jqfmt_vfsold:
1679 case Opt_jqfmt_vfsv0:
Jan Kara5a20bdf2009-11-30 23:58:32 +01001680 case Opt_jqfmt_vfsv1:
Eric Sandeenb31e1552009-06-04 17:36:36 -04001681 ext4_msg(sb, KERN_ERR,
1682 "journaled quota options not supported");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001683 break;
1684 case Opt_noquota:
1685 break;
1686#endif
1687 case Opt_abort:
Theodore Ts'o4ab2f152009-06-13 10:09:36 -04001688 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001689 break;
Theodore Ts'o06705bf2009-03-28 10:59:57 -04001690 case Opt_nobarrier:
1691 clear_opt(sbi->s_mount_opt, BARRIER);
1692 break;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001693 case Opt_barrier:
Eric Sandeen15121c12010-02-15 20:17:55 -05001694 if (args[0].from) {
1695 if (match_int(&args[0], &option))
1696 return 0;
1697 } else
1698 option = 1; /* No argument, default to 1 */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001699 if (option)
1700 set_opt(sbi->s_mount_opt, BARRIER);
1701 else
1702 clear_opt(sbi->s_mount_opt, BARRIER);
1703 break;
1704 case Opt_ignore:
1705 break;
1706 case Opt_resize:
1707 if (!is_remount) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04001708 ext4_msg(sb, KERN_ERR,
1709 "resize option only available "
1710 "for remount");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001711 return 0;
1712 }
1713 if (match_int(&args[0], &option) != 0)
1714 return 0;
1715 *n_blocks_count = option;
1716 break;
1717 case Opt_nobh:
Christoph Hellwig206f7ab2010-06-14 14:42:49 -04001718 ext4_msg(sb, KERN_WARNING,
1719 "Ignoring deprecated nobh option");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001720 break;
1721 case Opt_bh:
Christoph Hellwig206f7ab2010-06-14 14:42:49 -04001722 ext4_msg(sb, KERN_WARNING,
1723 "Ignoring deprecated bh option");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001724 break;
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -05001725 case Opt_i_version:
1726 set_opt(sbi->s_mount_opt, I_VERSION);
1727 sb->s_flags |= MS_I_VERSION;
1728 break;
Aneesh Kumar K.Vdd919b92008-07-11 19:27:31 -04001729 case Opt_nodelalloc:
1730 clear_opt(sbi->s_mount_opt, DELALLOC);
1731 break;
Theodore Ts'o14490322010-12-14 15:27:50 -05001732 case Opt_mblk_io_submit:
1733 set_opt(sbi->s_mount_opt, MBLK_IO_SUBMIT);
1734 break;
1735 case Opt_nomblk_io_submit:
1736 clear_opt(sbi->s_mount_opt, MBLK_IO_SUBMIT);
1737 break;
Alex Tomasc9de5602008-01-29 00:19:52 -05001738 case Opt_stripe:
1739 if (match_int(&args[0], &option))
1740 return 0;
1741 if (option < 0)
1742 return 0;
1743 sbi->s_stripe = option;
1744 break;
Alex Tomas64769242008-07-11 19:27:31 -04001745 case Opt_delalloc:
1746 set_opt(sbi->s_mount_opt, DELALLOC);
1747 break;
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04001748 case Opt_block_validity:
1749 set_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
1750 break;
1751 case Opt_noblock_validity:
1752 clear_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
1753 break;
Theodore Ts'o240799c2008-10-09 23:53:47 -04001754 case Opt_inode_readahead_blks:
1755 if (match_int(&args[0], &option))
1756 return 0;
1757 if (option < 0 || option > (1 << 30))
1758 return 0;
Theodore Ts'of7c43952009-04-24 23:31:59 -04001759 if (!is_power_of_2(option)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04001760 ext4_msg(sb, KERN_ERR,
1761 "EXT4-fs: inode_readahead_blks"
1762 " must be a power of 2");
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04001763 return 0;
1764 }
Theodore Ts'o240799c2008-10-09 23:53:47 -04001765 sbi->s_inode_readahead_blks = option;
1766 break;
Theodore Ts'ob3881f72009-01-05 22:46:26 -05001767 case Opt_journal_ioprio:
1768 if (match_int(&args[0], &option))
1769 return 0;
1770 if (option < 0 || option > 7)
1771 break;
1772 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE,
1773 option);
1774 break;
Theodore Ts'o06705bf2009-03-28 10:59:57 -04001775 case Opt_noauto_da_alloc:
1776 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1777 break;
Theodore Ts'oafd46722009-03-16 23:12:23 -04001778 case Opt_auto_da_alloc:
Eric Sandeen15121c12010-02-15 20:17:55 -05001779 if (args[0].from) {
1780 if (match_int(&args[0], &option))
1781 return 0;
1782 } else
1783 option = 1; /* No argument, default to 1 */
Theodore Ts'oafd46722009-03-16 23:12:23 -04001784 if (option)
1785 clear_opt(sbi->s_mount_opt, NO_AUTO_DA_ALLOC);
1786 else
1787 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1788 break;
Eric Sandeen5328e632009-11-19 14:25:42 -05001789 case Opt_discard:
1790 set_opt(sbi->s_mount_opt, DISCARD);
1791 break;
1792 case Opt_nodiscard:
1793 clear_opt(sbi->s_mount_opt, DISCARD);
1794 break;
Jiaying Zhang744692d2010-03-04 16:14:02 -05001795 case Opt_dioread_nolock:
1796 set_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
1797 break;
1798 case Opt_dioread_lock:
1799 clear_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
1800 break;
Lukas Czernerbfff6872010-10-27 21:30:05 -04001801 case Opt_init_inode_table:
1802 set_opt(sbi->s_mount_opt, INIT_INODE_TABLE);
1803 if (args[0].from) {
1804 if (match_int(&args[0], &option))
1805 return 0;
1806 } else
1807 option = EXT4_DEF_LI_WAIT_MULT;
1808 if (option < 0)
1809 return 0;
1810 sbi->s_li_wait_mult = option;
1811 break;
1812 case Opt_noinit_inode_table:
1813 clear_opt(sbi->s_mount_opt, INIT_INODE_TABLE);
1814 break;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001815 default:
Eric Sandeenb31e1552009-06-04 17:36:36 -04001816 ext4_msg(sb, KERN_ERR,
1817 "Unrecognized mount option \"%s\" "
1818 "or missing value", p);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001819 return 0;
1820 }
1821 }
1822#ifdef CONFIG_QUOTA
1823 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
Dmitry Monakhov482a7422010-02-24 11:35:32 -05001824 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001825 clear_opt(sbi->s_mount_opt, USRQUOTA);
1826
Dmitry Monakhov482a7422010-02-24 11:35:32 -05001827 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001828 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1829
Dmitry Monakhov56c50f12010-03-01 23:28:41 -05001830 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04001831 ext4_msg(sb, KERN_ERR, "old and new quota "
1832 "format mixing");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001833 return 0;
1834 }
1835
1836 if (!sbi->s_jquota_fmt) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04001837 ext4_msg(sb, KERN_ERR, "journaled quota format "
1838 "not specified");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001839 return 0;
1840 }
1841 } else {
1842 if (sbi->s_jquota_fmt) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04001843 ext4_msg(sb, KERN_ERR, "journaled quota format "
Jan Kara2c8be6b2008-05-13 21:27:55 -04001844 "specified with no journaling "
Eric Sandeenb31e1552009-06-04 17:36:36 -04001845 "enabled");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001846 return 0;
1847 }
1848 }
1849#endif
1850 return 1;
1851}
1852
Mingming Cao617ba132006-10-11 01:20:53 -07001853static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001854 int read_only)
1855{
Mingming Cao617ba132006-10-11 01:20:53 -07001856 struct ext4_sb_info *sbi = EXT4_SB(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001857 int res = 0;
1858
Mingming Cao617ba132006-10-11 01:20:53 -07001859 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04001860 ext4_msg(sb, KERN_ERR, "revision level too high, "
1861 "forcing read-only mode");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001862 res = MS_RDONLY;
1863 }
1864 if (read_only)
1865 return res;
Mingming Cao617ba132006-10-11 01:20:53 -07001866 if (!(sbi->s_mount_state & EXT4_VALID_FS))
Eric Sandeenb31e1552009-06-04 17:36:36 -04001867 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1868 "running e2fsck is recommended");
Mingming Cao617ba132006-10-11 01:20:53 -07001869 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
Eric Sandeenb31e1552009-06-04 17:36:36 -04001870 ext4_msg(sb, KERN_WARNING,
1871 "warning: mounting fs with errors, "
1872 "running e2fsck is recommended");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001873 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1874 le16_to_cpu(es->s_mnt_count) >=
1875 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
Eric Sandeenb31e1552009-06-04 17:36:36 -04001876 ext4_msg(sb, KERN_WARNING,
1877 "warning: maximal mount count reached, "
1878 "running e2fsck is recommended");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001879 else if (le32_to_cpu(es->s_checkinterval) &&
1880 (le32_to_cpu(es->s_lastcheck) +
1881 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
Eric Sandeenb31e1552009-06-04 17:36:36 -04001882 ext4_msg(sb, KERN_WARNING,
1883 "warning: checktime reached, "
1884 "running e2fsck is recommended");
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04001885 if (!sbi->s_journal)
Frank Mayhar03901312009-01-07 00:06:22 -05001886 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001887 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
Mingming Cao617ba132006-10-11 01:20:53 -07001888 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
Marcin Slusarze8546d02008-04-17 10:38:59 -04001889 le16_add_cpu(&es->s_mnt_count, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001890 es->s_mtime = cpu_to_le32(get_seconds());
Mingming Cao617ba132006-10-11 01:20:53 -07001891 ext4_update_dynamic_rev(sb);
Frank Mayhar03901312009-01-07 00:06:22 -05001892 if (sbi->s_journal)
1893 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001894
Theodore Ts'oe2d67052009-05-01 00:33:44 -04001895 ext4_commit_super(sb, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001896 if (test_opt(sb, DEBUG))
Theodore Ts'oa9df9a42009-01-05 22:18:16 -05001897 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
Theodore Ts'o7f4520c2009-06-13 10:09:41 -04001898 "bpg=%lu, ipg=%lu, mo=%04x]\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001899 sb->s_blocksize,
1900 sbi->s_groups_count,
Mingming Cao617ba132006-10-11 01:20:53 -07001901 EXT4_BLOCKS_PER_GROUP(sb),
1902 EXT4_INODES_PER_GROUP(sb),
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001903 sbi->s_mount_opt);
1904
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001905 return res;
1906}
1907
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001908static int ext4_fill_flex_info(struct super_block *sb)
1909{
1910 struct ext4_sb_info *sbi = EXT4_SB(sb);
1911 struct ext4_group_desc *gdp = NULL;
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001912 ext4_group_t flex_group_count;
1913 ext4_group_t flex_group;
1914 int groups_per_flex = 0;
Theodore Ts'oc5ca7c72009-04-27 22:48:48 -04001915 size_t size;
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001916 int i;
1917
Theodore Ts'o503358a2009-11-23 07:24:46 -05001918 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1919 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1920
1921 if (groups_per_flex < 2) {
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001922 sbi->s_log_groups_per_flex = 0;
1923 return 1;
1924 }
1925
Frederic Bohec62a11f2008-09-08 10:20:24 -04001926 /* We allocate both existing and potentially added groups */
1927 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
Aneesh Kumar K.Vd94e99a2008-11-04 09:11:26 -05001928 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1929 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
Theodore Ts'oc5ca7c72009-04-27 22:48:48 -04001930 size = flex_group_count * sizeof(struct flex_groups);
1931 sbi->s_flex_groups = kzalloc(size, GFP_KERNEL);
1932 if (sbi->s_flex_groups == NULL) {
1933 sbi->s_flex_groups = vmalloc(size);
1934 if (sbi->s_flex_groups)
1935 memset(sbi->s_flex_groups, 0, size);
1936 }
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001937 if (sbi->s_flex_groups == NULL) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04001938 ext4_msg(sb, KERN_ERR, "not enough memory for "
1939 "%u flex groups", flex_group_count);
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001940 goto failed;
1941 }
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001942
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001943 for (i = 0; i < sbi->s_groups_count; i++) {
Theodore Ts'o88b6edd2009-05-25 11:50:39 -04001944 gdp = ext4_get_group_desc(sb, i, NULL);
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001945
1946 flex_group = ext4_flex_group(sbi, i);
Theodore Ts'o7ad9bb62009-09-11 16:51:28 -04001947 atomic_add(ext4_free_inodes_count(sb, gdp),
1948 &sbi->s_flex_groups[flex_group].free_inodes);
1949 atomic_add(ext4_free_blks_count(sb, gdp),
1950 &sbi->s_flex_groups[flex_group].free_blocks);
1951 atomic_add(ext4_used_dirs_count(sb, gdp),
1952 &sbi->s_flex_groups[flex_group].used_dirs);
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001953 }
1954
1955 return 1;
1956failed:
1957 return 0;
1958}
1959
Andreas Dilger717d50e2007-10-16 18:38:25 -04001960__le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1961 struct ext4_group_desc *gdp)
1962{
1963 __u16 crc = 0;
1964
1965 if (sbi->s_es->s_feature_ro_compat &
1966 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1967 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1968 __le32 le_group = cpu_to_le32(block_group);
1969
1970 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1971 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1972 crc = crc16(crc, (__u8 *)gdp, offset);
1973 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1974 /* for checksum of struct ext4_group_desc do the rest...*/
1975 if ((sbi->s_es->s_feature_incompat &
1976 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1977 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1978 crc = crc16(crc, (__u8 *)gdp + offset,
1979 le16_to_cpu(sbi->s_es->s_desc_size) -
1980 offset);
1981 }
1982
1983 return cpu_to_le16(crc);
1984}
1985
1986int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1987 struct ext4_group_desc *gdp)
1988{
1989 if ((sbi->s_es->s_feature_ro_compat &
1990 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1991 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1992 return 0;
1993
1994 return 1;
1995}
1996
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001997/* Called at mount-time, super-block is locked */
Lukas Czernerbfff6872010-10-27 21:30:05 -04001998static int ext4_check_descriptors(struct super_block *sb,
1999 ext4_group_t *first_not_zeroed)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002000{
Mingming Cao617ba132006-10-11 01:20:53 -07002001 struct ext4_sb_info *sbi = EXT4_SB(sb);
2002 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2003 ext4_fsblk_t last_block;
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002004 ext4_fsblk_t block_bitmap;
2005 ext4_fsblk_t inode_bitmap;
2006 ext4_fsblk_t inode_table;
Jose R. Santosce421582007-10-16 18:38:25 -04002007 int flexbg_flag = 0;
Lukas Czernerbfff6872010-10-27 21:30:05 -04002008 ext4_group_t i, grp = sbi->s_groups_count;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002009
Jose R. Santosce421582007-10-16 18:38:25 -04002010 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2011 flexbg_flag = 1;
2012
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04002013 ext4_debug("Checking group descriptors");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002014
Akinobu Mita197cd65a2008-02-06 01:40:16 -08002015 for (i = 0; i < sbi->s_groups_count; i++) {
2016 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2017
Jose R. Santosce421582007-10-16 18:38:25 -04002018 if (i == sbi->s_groups_count - 1 || flexbg_flag)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002019 last_block = ext4_blocks_count(sbi->s_es) - 1;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002020 else
2021 last_block = first_block +
Mingming Cao617ba132006-10-11 01:20:53 -07002022 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002023
Lukas Czernerbfff6872010-10-27 21:30:05 -04002024 if ((grp == sbi->s_groups_count) &&
2025 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2026 grp = i;
2027
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07002028 block_bitmap = ext4_block_bitmap(sb, gdp);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002029 if (block_bitmap < first_block || block_bitmap > last_block) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04002030 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
Theodore Ts'oa9df9a42009-01-05 22:18:16 -05002031 "Block bitmap for group %u not in group "
Eric Sandeenb31e1552009-06-04 17:36:36 -04002032 "(block %llu)!", i, block_bitmap);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002033 return 0;
2034 }
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07002035 inode_bitmap = ext4_inode_bitmap(sb, gdp);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002036 if (inode_bitmap < first_block || inode_bitmap > last_block) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04002037 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
Theodore Ts'oa9df9a42009-01-05 22:18:16 -05002038 "Inode bitmap for group %u not in group "
Eric Sandeenb31e1552009-06-04 17:36:36 -04002039 "(block %llu)!", i, inode_bitmap);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002040 return 0;
2041 }
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07002042 inode_table = ext4_inode_table(sb, gdp);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002043 if (inode_table < first_block ||
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002044 inode_table + sbi->s_itb_per_group - 1 > last_block) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04002045 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
Theodore Ts'oa9df9a42009-01-05 22:18:16 -05002046 "Inode table for group %u not in group "
Eric Sandeenb31e1552009-06-04 17:36:36 -04002047 "(block %llu)!", i, inode_table);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002048 return 0;
2049 }
Aneesh Kumar K.V955ce5f2009-05-02 20:35:09 -04002050 ext4_lock_group(sb, i);
Andreas Dilger717d50e2007-10-16 18:38:25 -04002051 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04002052 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2053 "Checksum for group %u failed (%u!=%u)",
2054 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2055 gdp)), le16_to_cpu(gdp->bg_checksum));
Li Zefan7ee1ec42008-09-08 10:47:19 -04002056 if (!(sb->s_flags & MS_RDONLY)) {
Aneesh Kumar K.V955ce5f2009-05-02 20:35:09 -04002057 ext4_unlock_group(sb, i);
Theodore Ts'o8a266462008-07-26 14:34:21 -04002058 return 0;
Li Zefan7ee1ec42008-09-08 10:47:19 -04002059 }
Andreas Dilger717d50e2007-10-16 18:38:25 -04002060 }
Aneesh Kumar K.V955ce5f2009-05-02 20:35:09 -04002061 ext4_unlock_group(sb, i);
Jose R. Santosce421582007-10-16 18:38:25 -04002062 if (!flexbg_flag)
2063 first_block += EXT4_BLOCKS_PER_GROUP(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002064 }
Lukas Czernerbfff6872010-10-27 21:30:05 -04002065 if (NULL != first_not_zeroed)
2066 *first_not_zeroed = grp;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002067
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002068 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04002069 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002070 return 1;
2071}
2072
Mingming Cao617ba132006-10-11 01:20:53 -07002073/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002074 * the superblock) which were deleted from all directories, but held open by
2075 * a process at the time of a crash. We walk the list and try to delete these
2076 * inodes at recovery time (only with a read-write filesystem).
2077 *
2078 * In order to keep the orphan inode chain consistent during traversal (in
2079 * case of crash during recovery), we link each inode into the superblock
2080 * orphan list_head and handle it the same way as an inode deletion during
2081 * normal operation (which journals the operations for us).
2082 *
2083 * We only do an iget() and an iput() on each inode, which is very safe if we
2084 * accidentally point at an in-use or already deleted inode. The worst that
2085 * can happen in this case is that we get a "bit already cleared" message from
Mingming Cao617ba132006-10-11 01:20:53 -07002086 * ext4_free_inode(). The only reason we would point at a wrong inode is if
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002087 * e2fsck was run on this filesystem, and it must have already done the orphan
2088 * inode cleanup for us, so we can safely abort without any further action.
2089 */
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002090static void ext4_orphan_cleanup(struct super_block *sb,
2091 struct ext4_super_block *es)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002092{
2093 unsigned int s_flags = sb->s_flags;
2094 int nr_orphans = 0, nr_truncates = 0;
2095#ifdef CONFIG_QUOTA
2096 int i;
2097#endif
2098 if (!es->s_last_orphan) {
2099 jbd_debug(4, "no orphan inodes to clean up\n");
2100 return;
2101 }
2102
Eric Sandeena8f48a92006-12-06 20:40:13 -08002103 if (bdev_read_only(sb->s_bdev)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04002104 ext4_msg(sb, KERN_ERR, "write access "
2105 "unavailable, skipping orphan cleanup");
Eric Sandeena8f48a92006-12-06 20:40:13 -08002106 return;
2107 }
2108
Mingming Cao617ba132006-10-11 01:20:53 -07002109 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002110 if (es->s_last_orphan)
2111 jbd_debug(1, "Errors on filesystem, "
2112 "clearing orphan list.\n");
2113 es->s_last_orphan = 0;
2114 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2115 return;
2116 }
2117
2118 if (s_flags & MS_RDONLY) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04002119 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002120 sb->s_flags &= ~MS_RDONLY;
2121 }
2122#ifdef CONFIG_QUOTA
2123 /* Needed for iput() to work correctly and not trash data */
2124 sb->s_flags |= MS_ACTIVE;
2125 /* Turn on quotas so that they are updated correctly */
2126 for (i = 0; i < MAXQUOTAS; i++) {
Mingming Cao617ba132006-10-11 01:20:53 -07002127 if (EXT4_SB(sb)->s_qf_names[i]) {
2128 int ret = ext4_quota_on_mount(sb, i);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002129 if (ret < 0)
Eric Sandeenb31e1552009-06-04 17:36:36 -04002130 ext4_msg(sb, KERN_ERR,
2131 "Cannot turn on journaled "
2132 "quota: error %d", ret);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002133 }
2134 }
2135#endif
2136
2137 while (es->s_last_orphan) {
2138 struct inode *inode;
2139
Josef Bacik97bd42b2008-04-29 22:04:56 -04002140 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2141 if (IS_ERR(inode)) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002142 es->s_last_orphan = 0;
2143 break;
2144 }
2145
Mingming Cao617ba132006-10-11 01:20:53 -07002146 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
Christoph Hellwig871a2932010-03-03 09:05:07 -05002147 dquot_initialize(inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002148 if (inode->i_nlink) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04002149 ext4_msg(sb, KERN_DEBUG,
2150 "%s: truncating inode %lu to %lld bytes",
Harvey Harrison46e665e2008-04-17 10:38:59 -04002151 __func__, inode->i_ino, inode->i_size);
Theodore Ts'oe5f8eab82008-09-08 22:25:04 -04002152 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002153 inode->i_ino, inode->i_size);
Mingming Cao617ba132006-10-11 01:20:53 -07002154 ext4_truncate(inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002155 nr_truncates++;
2156 } else {
Eric Sandeenb31e1552009-06-04 17:36:36 -04002157 ext4_msg(sb, KERN_DEBUG,
2158 "%s: deleting unreferenced inode %lu",
Harvey Harrison46e665e2008-04-17 10:38:59 -04002159 __func__, inode->i_ino);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002160 jbd_debug(2, "deleting unreferenced inode %lu\n",
2161 inode->i_ino);
2162 nr_orphans++;
2163 }
2164 iput(inode); /* The delete magic happens here! */
2165 }
2166
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002167#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002168
2169 if (nr_orphans)
Eric Sandeenb31e1552009-06-04 17:36:36 -04002170 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2171 PLURAL(nr_orphans));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002172 if (nr_truncates)
Eric Sandeenb31e1552009-06-04 17:36:36 -04002173 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2174 PLURAL(nr_truncates));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002175#ifdef CONFIG_QUOTA
2176 /* Turn quotas off */
2177 for (i = 0; i < MAXQUOTAS; i++) {
2178 if (sb_dqopt(sb)->files[i])
Christoph Hellwig287a8092010-05-19 07:16:45 -04002179 dquot_quota_off(sb, i);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002180 }
2181#endif
2182 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2183}
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04002184
Eric Sandeencd2291a2008-01-28 23:58:27 -05002185/*
2186 * Maximal extent format file size.
2187 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2188 * extent format containers, within a sector_t, and within i_blocks
2189 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2190 * so that won't be a limiting factor.
2191 *
2192 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2193 */
Theodore Ts'of287a1a2008-10-16 22:50:48 -04002194static loff_t ext4_max_size(int blkbits, int has_huge_files)
Eric Sandeencd2291a2008-01-28 23:58:27 -05002195{
2196 loff_t res;
2197 loff_t upper_limit = MAX_LFS_FILESIZE;
2198
2199 /* small i_blocks in vfs inode? */
Theodore Ts'of287a1a2008-10-16 22:50:48 -04002200 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
Eric Sandeencd2291a2008-01-28 23:58:27 -05002201 /*
Bartlomiej Zolnierkiewicz90c699a2009-06-19 08:08:50 +02002202 * CONFIG_LBDAF is not enabled implies the inode
Eric Sandeencd2291a2008-01-28 23:58:27 -05002203 * i_block represent total blocks in 512 bytes
2204 * 32 == size of vfs inode i_blocks * 8
2205 */
2206 upper_limit = (1LL << 32) - 1;
2207
2208 /* total blocks in file system block size */
2209 upper_limit >>= (blkbits - 9);
2210 upper_limit <<= blkbits;
2211 }
2212
2213 /* 32-bit extent-start container, ee_block */
2214 res = 1LL << 32;
2215 res <<= blkbits;
2216 res -= 1;
2217
2218 /* Sanity check against vm- & vfs- imposed limits */
2219 if (res > upper_limit)
2220 res = upper_limit;
2221
2222 return res;
2223}
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002224
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002225/*
Eric Sandeencd2291a2008-01-28 23:58:27 -05002226 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05002227 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2228 * We need to be 1 filesystem block less than the 2^48 sector limit.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002229 */
Theodore Ts'of287a1a2008-10-16 22:50:48 -04002230static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002231{
Mingming Cao617ba132006-10-11 01:20:53 -07002232 loff_t res = EXT4_NDIR_BLOCKS;
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05002233 int meta_blocks;
2234 loff_t upper_limit;
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04002235 /* This is calculated to be the largest file size for a dense, block
2236 * mapped file such that the file's total number of 512-byte sectors,
2237 * including data and all indirect blocks, does not exceed (2^48 - 1).
2238 *
2239 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2240 * number of 512-byte sectors of the file.
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05002241 */
2242
Theodore Ts'of287a1a2008-10-16 22:50:48 -04002243 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05002244 /*
Bartlomiej Zolnierkiewicz90c699a2009-06-19 08:08:50 +02002245 * !has_huge_files or CONFIG_LBDAF not enabled implies that
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04002246 * the inode i_block field represents total file blocks in
2247 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05002248 */
2249 upper_limit = (1LL << 32) - 1;
2250
2251 /* total blocks in file system block size */
2252 upper_limit >>= (bits - 9);
2253
2254 } else {
Aneesh Kumar K.V8180a562008-01-28 23:58:27 -05002255 /*
2256 * We use 48 bit ext4_inode i_blocks
2257 * With EXT4_HUGE_FILE_FL set the i_blocks
2258 * represent total number of blocks in
2259 * file system block size
2260 */
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05002261 upper_limit = (1LL << 48) - 1;
2262
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05002263 }
2264
2265 /* indirect blocks */
2266 meta_blocks = 1;
2267 /* double indirect blocks */
2268 meta_blocks += 1 + (1LL << (bits-2));
2269 /* tripple indirect blocks */
2270 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2271
2272 upper_limit -= meta_blocks;
2273 upper_limit <<= bits;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002274
2275 res += 1LL << (bits-2);
2276 res += 1LL << (2*(bits-2));
2277 res += 1LL << (3*(bits-2));
2278 res <<= bits;
2279 if (res > upper_limit)
2280 res = upper_limit;
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05002281
2282 if (res > MAX_LFS_FILESIZE)
2283 res = MAX_LFS_FILESIZE;
2284
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002285 return res;
2286}
2287
Mingming Cao617ba132006-10-11 01:20:53 -07002288static ext4_fsblk_t descriptor_loc(struct super_block *sb,
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04002289 ext4_fsblk_t logical_sb_block, int nr)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002290{
Mingming Cao617ba132006-10-11 01:20:53 -07002291 struct ext4_sb_info *sbi = EXT4_SB(sb);
Avantika Mathurfd2d4292008-01-28 23:58:27 -05002292 ext4_group_t bg, first_meta_bg;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002293 int has_super = 0;
2294
2295 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2296
Mingming Cao617ba132006-10-11 01:20:53 -07002297 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002298 nr < first_meta_bg)
Andrew Morton70bbb3e2006-10-11 01:21:20 -07002299 return logical_sb_block + nr + 1;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002300 bg = sbi->s_desc_per_block * nr;
Mingming Cao617ba132006-10-11 01:20:53 -07002301 if (ext4_bg_has_super(sb, bg))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002302 has_super = 1;
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04002303
Mingming Cao617ba132006-10-11 01:20:53 -07002304 return (has_super + ext4_group_first_block_no(sb, bg));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002305}
2306
Alex Tomasc9de5602008-01-29 00:19:52 -05002307/**
2308 * ext4_get_stripe_size: Get the stripe size.
2309 * @sbi: In memory super block info
2310 *
2311 * If we have specified it via mount option, then
2312 * use the mount option value. If the value specified at mount time is
2313 * greater than the blocks per group use the super block value.
2314 * If the super block value is greater than blocks per group return 0.
2315 * Allocator needs it be less than blocks per group.
2316 *
2317 */
2318static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2319{
2320 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2321 unsigned long stripe_width =
2322 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2323
2324 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2325 return sbi->s_stripe;
2326
2327 if (stripe_width <= sbi->s_blocks_per_group)
2328 return stripe_width;
2329
2330 if (stride <= sbi->s_blocks_per_group)
2331 return stride;
2332
2333 return 0;
2334}
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002335
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002336/* sysfs supprt */
2337
2338struct ext4_attr {
2339 struct attribute attr;
2340 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
Theodore Ts'o60e66792010-05-17 07:00:00 -04002341 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002342 const char *, size_t);
2343 int offset;
2344};
2345
2346static int parse_strtoul(const char *buf,
2347 unsigned long max, unsigned long *value)
2348{
2349 char *endp;
2350
André Goddard Rosae7d28602009-12-14 18:01:06 -08002351 *value = simple_strtoul(skip_spaces(buf), &endp, 0);
2352 endp = skip_spaces(endp);
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002353 if (*endp || *value > max)
2354 return -EINVAL;
2355
2356 return 0;
2357}
2358
2359static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2360 struct ext4_sb_info *sbi,
2361 char *buf)
2362{
2363 return snprintf(buf, PAGE_SIZE, "%llu\n",
2364 (s64) percpu_counter_sum(&sbi->s_dirtyblocks_counter));
2365}
2366
2367static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2368 struct ext4_sb_info *sbi, char *buf)
2369{
2370 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2371
Theodore Ts'of613dfc2010-07-27 11:56:08 -04002372 if (!sb->s_bdev->bd_part)
2373 return snprintf(buf, PAGE_SIZE, "0\n");
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002374 return snprintf(buf, PAGE_SIZE, "%lu\n",
2375 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2376 sbi->s_sectors_written_start) >> 1);
2377}
2378
2379static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2380 struct ext4_sb_info *sbi, char *buf)
2381{
2382 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2383
Theodore Ts'of613dfc2010-07-27 11:56:08 -04002384 if (!sb->s_bdev->bd_part)
2385 return snprintf(buf, PAGE_SIZE, "0\n");
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002386 return snprintf(buf, PAGE_SIZE, "%llu\n",
Andrew Mortona6b43e32009-12-23 07:48:08 -05002387 (unsigned long long)(sbi->s_kbytes_written +
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002388 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
Andrew Mortona6b43e32009-12-23 07:48:08 -05002389 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002390}
2391
2392static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2393 struct ext4_sb_info *sbi,
2394 const char *buf, size_t count)
2395{
2396 unsigned long t;
2397
2398 if (parse_strtoul(buf, 0x40000000, &t))
2399 return -EINVAL;
2400
Theodore Ts'of7c43952009-04-24 23:31:59 -04002401 if (!is_power_of_2(t))
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002402 return -EINVAL;
2403
2404 sbi->s_inode_readahead_blks = t;
2405 return count;
2406}
2407
2408static ssize_t sbi_ui_show(struct ext4_attr *a,
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04002409 struct ext4_sb_info *sbi, char *buf)
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002410{
2411 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2412
2413 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2414}
2415
2416static ssize_t sbi_ui_store(struct ext4_attr *a,
2417 struct ext4_sb_info *sbi,
2418 const char *buf, size_t count)
2419{
2420 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2421 unsigned long t;
2422
2423 if (parse_strtoul(buf, 0xffffffff, &t))
2424 return -EINVAL;
2425 *ui = t;
2426 return count;
2427}
2428
2429#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2430static struct ext4_attr ext4_attr_##_name = { \
2431 .attr = {.name = __stringify(_name), .mode = _mode }, \
2432 .show = _show, \
2433 .store = _store, \
2434 .offset = offsetof(struct ext4_sb_info, _elname), \
2435}
2436#define EXT4_ATTR(name, mode, show, store) \
2437static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2438
Lukas Czerner857ac882010-10-27 21:30:05 -04002439#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002440#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2441#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2442#define EXT4_RW_ATTR_SBI_UI(name, elname) \
2443 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2444#define ATTR_LIST(name) &ext4_attr_##name.attr
2445
2446EXT4_RO_ATTR(delayed_allocation_blocks);
2447EXT4_RO_ATTR(session_write_kbytes);
2448EXT4_RO_ATTR(lifetime_write_kbytes);
2449EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2450 inode_readahead_blks_store, s_inode_readahead_blks);
Andreas Dilger11013912009-06-13 11:45:35 -04002451EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002452EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2453EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2454EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2455EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2456EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2457EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
Theodore Ts'o55138e02009-09-29 13:31:31 -04002458EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002459
2460static struct attribute *ext4_attrs[] = {
2461 ATTR_LIST(delayed_allocation_blocks),
2462 ATTR_LIST(session_write_kbytes),
2463 ATTR_LIST(lifetime_write_kbytes),
2464 ATTR_LIST(inode_readahead_blks),
Andreas Dilger11013912009-06-13 11:45:35 -04002465 ATTR_LIST(inode_goal),
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002466 ATTR_LIST(mb_stats),
2467 ATTR_LIST(mb_max_to_scan),
2468 ATTR_LIST(mb_min_to_scan),
2469 ATTR_LIST(mb_order2_req),
2470 ATTR_LIST(mb_stream_req),
2471 ATTR_LIST(mb_group_prealloc),
Theodore Ts'o55138e02009-09-29 13:31:31 -04002472 ATTR_LIST(max_writeback_mb_bump),
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002473 NULL,
2474};
2475
Lukas Czerner857ac882010-10-27 21:30:05 -04002476/* Features this copy of ext4 supports */
2477EXT4_INFO_ATTR(lazy_itable_init);
Lukas Czerner27ee40d2010-10-27 21:30:12 -04002478EXT4_INFO_ATTR(batched_discard);
Lukas Czerner857ac882010-10-27 21:30:05 -04002479
2480static struct attribute *ext4_feat_attrs[] = {
2481 ATTR_LIST(lazy_itable_init),
Lukas Czerner27ee40d2010-10-27 21:30:12 -04002482 ATTR_LIST(batched_discard),
Lukas Czerner857ac882010-10-27 21:30:05 -04002483 NULL,
2484};
2485
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002486static ssize_t ext4_attr_show(struct kobject *kobj,
2487 struct attribute *attr, char *buf)
2488{
2489 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2490 s_kobj);
2491 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2492
2493 return a->show ? a->show(a, sbi, buf) : 0;
2494}
2495
2496static ssize_t ext4_attr_store(struct kobject *kobj,
2497 struct attribute *attr,
2498 const char *buf, size_t len)
2499{
2500 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2501 s_kobj);
2502 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2503
2504 return a->store ? a->store(a, sbi, buf, len) : 0;
2505}
2506
2507static void ext4_sb_release(struct kobject *kobj)
2508{
2509 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2510 s_kobj);
2511 complete(&sbi->s_kobj_unregister);
2512}
2513
Emese Revfy52cf25d2010-01-19 02:58:23 +01002514static const struct sysfs_ops ext4_attr_ops = {
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04002515 .show = ext4_attr_show,
2516 .store = ext4_attr_store,
2517};
2518
2519static struct kobj_type ext4_ktype = {
2520 .default_attrs = ext4_attrs,
2521 .sysfs_ops = &ext4_attr_ops,
2522 .release = ext4_sb_release,
2523};
2524
Lukas Czerner857ac882010-10-27 21:30:05 -04002525static void ext4_feat_release(struct kobject *kobj)
2526{
2527 complete(&ext4_feat->f_kobj_unregister);
2528}
2529
2530static struct kobj_type ext4_feat_ktype = {
2531 .default_attrs = ext4_feat_attrs,
2532 .sysfs_ops = &ext4_attr_ops,
2533 .release = ext4_feat_release,
2534};
2535
Eric Sandeena13fb1a2009-08-18 00:20:23 -04002536/*
2537 * Check whether this filesystem can be mounted based on
2538 * the features present and the RDONLY/RDWR mount requested.
2539 * Returns 1 if this filesystem can be mounted as requested,
2540 * 0 if it cannot be.
2541 */
2542static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2543{
2544 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2545 ext4_msg(sb, KERN_ERR,
2546 "Couldn't mount because of "
2547 "unsupported optional features (%x)",
2548 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2549 ~EXT4_FEATURE_INCOMPAT_SUPP));
2550 return 0;
2551 }
2552
2553 if (readonly)
2554 return 1;
2555
2556 /* Check that feature set is OK for a read-write mount */
2557 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2558 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2559 "unsupported optional features (%x)",
2560 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2561 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2562 return 0;
2563 }
2564 /*
2565 * Large file size enabled file system can only be mounted
2566 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2567 */
2568 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2569 if (sizeof(blkcnt_t) < sizeof(u64)) {
2570 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2571 "cannot be mounted RDWR without "
2572 "CONFIG_LBDAF");
2573 return 0;
2574 }
2575 }
2576 return 1;
2577}
2578
Theodore Ts'o66e61a92010-07-27 11:56:04 -04002579/*
2580 * This function is called once a day if we have errors logged
2581 * on the file system
2582 */
2583static void print_daily_error_info(unsigned long arg)
2584{
2585 struct super_block *sb = (struct super_block *) arg;
2586 struct ext4_sb_info *sbi;
2587 struct ext4_super_block *es;
2588
2589 sbi = EXT4_SB(sb);
2590 es = sbi->s_es;
2591
2592 if (es->s_error_count)
2593 ext4_msg(sb, KERN_NOTICE, "error count: %u",
2594 le32_to_cpu(es->s_error_count));
2595 if (es->s_first_error_time) {
2596 printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
2597 sb->s_id, le32_to_cpu(es->s_first_error_time),
2598 (int) sizeof(es->s_first_error_func),
2599 es->s_first_error_func,
2600 le32_to_cpu(es->s_first_error_line));
2601 if (es->s_first_error_ino)
2602 printk(": inode %u",
2603 le32_to_cpu(es->s_first_error_ino));
2604 if (es->s_first_error_block)
2605 printk(": block %llu", (unsigned long long)
2606 le64_to_cpu(es->s_first_error_block));
2607 printk("\n");
2608 }
2609 if (es->s_last_error_time) {
2610 printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
2611 sb->s_id, le32_to_cpu(es->s_last_error_time),
2612 (int) sizeof(es->s_last_error_func),
2613 es->s_last_error_func,
2614 le32_to_cpu(es->s_last_error_line));
2615 if (es->s_last_error_ino)
2616 printk(": inode %u",
2617 le32_to_cpu(es->s_last_error_ino));
2618 if (es->s_last_error_block)
2619 printk(": block %llu", (unsigned long long)
2620 le64_to_cpu(es->s_last_error_block));
2621 printk("\n");
2622 }
2623 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2624}
2625
Lukas Czernerbfff6872010-10-27 21:30:05 -04002626static void ext4_lazyinode_timeout(unsigned long data)
2627{
2628 struct task_struct *p = (struct task_struct *)data;
2629 wake_up_process(p);
2630}
2631
2632/* Find next suitable group and run ext4_init_inode_table */
2633static int ext4_run_li_request(struct ext4_li_request *elr)
2634{
2635 struct ext4_group_desc *gdp = NULL;
2636 ext4_group_t group, ngroups;
2637 struct super_block *sb;
2638 unsigned long timeout = 0;
2639 int ret = 0;
2640
2641 sb = elr->lr_super;
2642 ngroups = EXT4_SB(sb)->s_groups_count;
2643
2644 for (group = elr->lr_next_group; group < ngroups; group++) {
2645 gdp = ext4_get_group_desc(sb, group, NULL);
2646 if (!gdp) {
2647 ret = 1;
2648 break;
2649 }
2650
2651 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2652 break;
2653 }
2654
2655 if (group == ngroups)
2656 ret = 1;
2657
2658 if (!ret) {
2659 timeout = jiffies;
2660 ret = ext4_init_inode_table(sb, group,
2661 elr->lr_timeout ? 0 : 1);
2662 if (elr->lr_timeout == 0) {
2663 timeout = jiffies - timeout;
2664 if (elr->lr_sbi->s_li_wait_mult)
2665 timeout *= elr->lr_sbi->s_li_wait_mult;
2666 else
2667 timeout *= 20;
2668 elr->lr_timeout = timeout;
2669 }
2670 elr->lr_next_sched = jiffies + elr->lr_timeout;
2671 elr->lr_next_group = group + 1;
2672 }
2673
2674 return ret;
2675}
2676
2677/*
2678 * Remove lr_request from the list_request and free the
2679 * request tructure. Should be called with li_list_mtx held
2680 */
2681static void ext4_remove_li_request(struct ext4_li_request *elr)
2682{
2683 struct ext4_sb_info *sbi;
2684
2685 if (!elr)
2686 return;
2687
2688 sbi = elr->lr_sbi;
2689
2690 list_del(&elr->lr_request);
2691 sbi->s_li_request = NULL;
2692 kfree(elr);
2693}
2694
2695static void ext4_unregister_li_request(struct super_block *sb)
2696{
2697 struct ext4_li_request *elr = EXT4_SB(sb)->s_li_request;
2698
2699 if (!ext4_li_info)
2700 return;
2701
2702 mutex_lock(&ext4_li_info->li_list_mtx);
2703 ext4_remove_li_request(elr);
2704 mutex_unlock(&ext4_li_info->li_list_mtx);
2705}
2706
2707/*
2708 * This is the function where ext4lazyinit thread lives. It walks
2709 * through the request list searching for next scheduled filesystem.
2710 * When such a fs is found, run the lazy initialization request
2711 * (ext4_rn_li_request) and keep track of the time spend in this
2712 * function. Based on that time we compute next schedule time of
2713 * the request. When walking through the list is complete, compute
2714 * next waking time and put itself into sleep.
2715 */
2716static int ext4_lazyinit_thread(void *arg)
2717{
2718 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2719 struct list_head *pos, *n;
2720 struct ext4_li_request *elr;
2721 unsigned long next_wakeup;
2722 DEFINE_WAIT(wait);
Lukas Czernerbfff6872010-10-27 21:30:05 -04002723
2724 BUG_ON(NULL == eli);
2725
2726 eli->li_timer.data = (unsigned long)current;
2727 eli->li_timer.function = ext4_lazyinode_timeout;
2728
2729 eli->li_task = current;
2730 wake_up(&eli->li_wait_task);
2731
2732cont_thread:
2733 while (true) {
2734 next_wakeup = MAX_JIFFY_OFFSET;
2735
2736 mutex_lock(&eli->li_list_mtx);
2737 if (list_empty(&eli->li_request_list)) {
2738 mutex_unlock(&eli->li_list_mtx);
2739 goto exit_thread;
2740 }
2741
2742 list_for_each_safe(pos, n, &eli->li_request_list) {
2743 elr = list_entry(pos, struct ext4_li_request,
2744 lr_request);
2745
Theodore Ts'ob2c78cd2010-11-02 14:19:30 -04002746 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2747 if (ext4_run_li_request(elr) != 0) {
2748 /* error, remove the lazy_init job */
2749 ext4_remove_li_request(elr);
2750 continue;
2751 }
Lukas Czernerbfff6872010-10-27 21:30:05 -04002752 }
2753
2754 if (time_before(elr->lr_next_sched, next_wakeup))
2755 next_wakeup = elr->lr_next_sched;
2756 }
2757 mutex_unlock(&eli->li_list_mtx);
2758
2759 if (freezing(current))
2760 refrigerator();
2761
Lukas Czernerf4245bd2010-11-02 14:07:17 -04002762 if ((time_after_eq(jiffies, next_wakeup)) ||
2763 (MAX_JIFFY_OFFSET == next_wakeup)) {
Lukas Czernerbfff6872010-10-27 21:30:05 -04002764 cond_resched();
2765 continue;
2766 }
2767
2768 eli->li_timer.expires = next_wakeup;
2769 add_timer(&eli->li_timer);
2770 prepare_to_wait(&eli->li_wait_daemon, &wait,
2771 TASK_INTERRUPTIBLE);
2772 if (time_before(jiffies, next_wakeup))
2773 schedule();
2774 finish_wait(&eli->li_wait_daemon, &wait);
2775 }
2776
2777exit_thread:
2778 /*
2779 * It looks like the request list is empty, but we need
2780 * to check it under the li_list_mtx lock, to prevent any
2781 * additions into it, and of course we should lock ext4_li_mtx
2782 * to atomically free the list and ext4_li_info, because at
2783 * this point another ext4 filesystem could be registering
2784 * new one.
2785 */
2786 mutex_lock(&ext4_li_mtx);
2787 mutex_lock(&eli->li_list_mtx);
2788 if (!list_empty(&eli->li_request_list)) {
2789 mutex_unlock(&eli->li_list_mtx);
2790 mutex_unlock(&ext4_li_mtx);
2791 goto cont_thread;
2792 }
2793 mutex_unlock(&eli->li_list_mtx);
2794 del_timer_sync(&ext4_li_info->li_timer);
2795 eli->li_task = NULL;
2796 wake_up(&eli->li_wait_task);
2797
2798 kfree(ext4_li_info);
2799 ext4_li_info = NULL;
2800 mutex_unlock(&ext4_li_mtx);
2801
2802 return 0;
2803}
2804
2805static void ext4_clear_request_list(void)
2806{
2807 struct list_head *pos, *n;
2808 struct ext4_li_request *elr;
2809
2810 mutex_lock(&ext4_li_info->li_list_mtx);
Lukas Czernerbfff6872010-10-27 21:30:05 -04002811 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2812 elr = list_entry(pos, struct ext4_li_request,
2813 lr_request);
2814 ext4_remove_li_request(elr);
2815 }
2816 mutex_unlock(&ext4_li_info->li_list_mtx);
2817}
2818
2819static int ext4_run_lazyinit_thread(void)
2820{
2821 struct task_struct *t;
2822
2823 t = kthread_run(ext4_lazyinit_thread, ext4_li_info, "ext4lazyinit");
2824 if (IS_ERR(t)) {
2825 int err = PTR_ERR(t);
2826 ext4_clear_request_list();
2827 del_timer_sync(&ext4_li_info->li_timer);
2828 kfree(ext4_li_info);
2829 ext4_li_info = NULL;
2830 printk(KERN_CRIT "EXT4: error %d creating inode table "
2831 "initialization thread\n",
2832 err);
2833 return err;
2834 }
2835 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
2836
2837 wait_event(ext4_li_info->li_wait_task, ext4_li_info->li_task != NULL);
2838 return 0;
2839}
2840
2841/*
2842 * Check whether it make sense to run itable init. thread or not.
2843 * If there is at least one uninitialized inode table, return
2844 * corresponding group number, else the loop goes through all
2845 * groups and return total number of groups.
2846 */
2847static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2848{
2849 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2850 struct ext4_group_desc *gdp = NULL;
2851
2852 for (group = 0; group < ngroups; group++) {
2853 gdp = ext4_get_group_desc(sb, group, NULL);
2854 if (!gdp)
2855 continue;
2856
2857 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2858 break;
2859 }
2860
2861 return group;
2862}
2863
2864static int ext4_li_info_new(void)
2865{
2866 struct ext4_lazy_init *eli = NULL;
2867
2868 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2869 if (!eli)
2870 return -ENOMEM;
2871
2872 eli->li_task = NULL;
2873 INIT_LIST_HEAD(&eli->li_request_list);
2874 mutex_init(&eli->li_list_mtx);
2875
2876 init_waitqueue_head(&eli->li_wait_daemon);
2877 init_waitqueue_head(&eli->li_wait_task);
2878 init_timer(&eli->li_timer);
2879 eli->li_state |= EXT4_LAZYINIT_QUIT;
2880
2881 ext4_li_info = eli;
2882
2883 return 0;
2884}
2885
2886static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
2887 ext4_group_t start)
2888{
2889 struct ext4_sb_info *sbi = EXT4_SB(sb);
2890 struct ext4_li_request *elr;
2891 unsigned long rnd;
2892
2893 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
2894 if (!elr)
2895 return NULL;
2896
2897 elr->lr_super = sb;
2898 elr->lr_sbi = sbi;
2899 elr->lr_next_group = start;
2900
2901 /*
2902 * Randomize first schedule time of the request to
2903 * spread the inode table initialization requests
2904 * better.
2905 */
2906 get_random_bytes(&rnd, sizeof(rnd));
2907 elr->lr_next_sched = jiffies + (unsigned long)rnd %
2908 (EXT4_DEF_LI_MAX_START_DELAY * HZ);
2909
2910 return elr;
2911}
2912
2913static int ext4_register_li_request(struct super_block *sb,
2914 ext4_group_t first_not_zeroed)
2915{
2916 struct ext4_sb_info *sbi = EXT4_SB(sb);
2917 struct ext4_li_request *elr;
2918 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
Nicolas Kaiserbeed5ecb2010-10-27 22:08:42 -04002919 int ret;
Lukas Czernerbfff6872010-10-27 21:30:05 -04002920
2921 if (sbi->s_li_request != NULL)
Nicolas Kaiserbeed5ecb2010-10-27 22:08:42 -04002922 return 0;
Lukas Czernerbfff6872010-10-27 21:30:05 -04002923
2924 if (first_not_zeroed == ngroups ||
2925 (sb->s_flags & MS_RDONLY) ||
2926 !test_opt(sb, INIT_INODE_TABLE)) {
2927 sbi->s_li_request = NULL;
Nicolas Kaiserbeed5ecb2010-10-27 22:08:42 -04002928 return 0;
Lukas Czernerbfff6872010-10-27 21:30:05 -04002929 }
2930
2931 if (first_not_zeroed == ngroups) {
2932 sbi->s_li_request = NULL;
Nicolas Kaiserbeed5ecb2010-10-27 22:08:42 -04002933 return 0;
Lukas Czernerbfff6872010-10-27 21:30:05 -04002934 }
2935
2936 elr = ext4_li_request_new(sb, first_not_zeroed);
Nicolas Kaiserbeed5ecb2010-10-27 22:08:42 -04002937 if (!elr)
2938 return -ENOMEM;
Lukas Czernerbfff6872010-10-27 21:30:05 -04002939
2940 mutex_lock(&ext4_li_mtx);
2941
2942 if (NULL == ext4_li_info) {
2943 ret = ext4_li_info_new();
2944 if (ret)
2945 goto out;
2946 }
2947
2948 mutex_lock(&ext4_li_info->li_list_mtx);
2949 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
2950 mutex_unlock(&ext4_li_info->li_list_mtx);
2951
2952 sbi->s_li_request = elr;
2953
2954 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
2955 ret = ext4_run_lazyinit_thread();
2956 if (ret)
2957 goto out;
2958 }
Lukas Czernerbfff6872010-10-27 21:30:05 -04002959out:
Nicolas Kaiserbeed5ecb2010-10-27 22:08:42 -04002960 mutex_unlock(&ext4_li_mtx);
2961 if (ret)
Lukas Czernerbfff6872010-10-27 21:30:05 -04002962 kfree(elr);
Lukas Czernerbfff6872010-10-27 21:30:05 -04002963 return ret;
2964}
2965
2966/*
2967 * We do not need to lock anything since this is called on
2968 * module unload.
2969 */
2970static void ext4_destroy_lazyinit_thread(void)
2971{
2972 /*
2973 * If thread exited earlier
2974 * there's nothing to be done.
2975 */
2976 if (!ext4_li_info)
2977 return;
2978
2979 ext4_clear_request_list();
2980
2981 while (ext4_li_info->li_task) {
2982 wake_up(&ext4_li_info->li_wait_daemon);
2983 wait_event(ext4_li_info->li_wait_task,
2984 ext4_li_info->li_task == NULL);
2985 }
2986}
2987
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002988static int ext4_fill_super(struct super_block *sb, void *data, int silent)
Aneesh Kumar K.V74778272008-07-11 19:27:31 -04002989 __releases(kernel_lock)
2990 __acquires(kernel_lock)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002991{
Curt Wohlgemuthd4c402d2010-05-16 12:00:00 -04002992 char *orig_data = kstrdup(data, GFP_KERNEL);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002993 struct buffer_head *bh;
Mingming Cao617ba132006-10-11 01:20:53 -07002994 struct ext4_super_block *es = NULL;
2995 struct ext4_sb_info *sbi;
2996 ext4_fsblk_t block;
2997 ext4_fsblk_t sb_block = get_sb_block(&data);
Andrew Morton70bbb3e2006-10-11 01:21:20 -07002998 ext4_fsblk_t logical_sb_block;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002999 unsigned long offset = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003000 unsigned long journal_devnum = 0;
3001 unsigned long def_mount_opts;
3002 struct inode *root;
Theodore Ts'o9f6200b2008-09-23 09:18:24 -04003003 char *cp;
Frank Mayhar03901312009-01-07 00:06:22 -05003004 const char *descr;
Cyrill Gorcunovdcc7dae2010-07-27 11:56:07 -04003005 int ret = -ENOMEM;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003006 int blocksize;
Theodore Ts'o4ec11022009-01-06 14:53:26 -05003007 unsigned int db_count;
3008 unsigned int i;
Theodore Ts'of287a1a2008-10-16 22:50:48 -04003009 int needs_recovery, has_huge_files;
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07003010 __u64 blocks_count;
Peter Zijlstra833f4072007-10-16 23:25:45 -07003011 int err;
Theodore Ts'ob3881f72009-01-05 22:46:26 -05003012 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
Lukas Czernerbfff6872010-10-27 21:30:05 -04003013 ext4_group_t first_not_zeroed;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003014
3015 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3016 if (!sbi)
Cyrill Gorcunovdcc7dae2010-07-27 11:56:07 -04003017 goto out_free_orig;
Pekka Enberg705895b2009-02-15 18:07:52 -05003018
3019 sbi->s_blockgroup_lock =
3020 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3021 if (!sbi->s_blockgroup_lock) {
3022 kfree(sbi);
Cyrill Gorcunovdcc7dae2010-07-27 11:56:07 -04003023 goto out_free_orig;
Pekka Enberg705895b2009-02-15 18:07:52 -05003024 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003025 sb->s_fs_info = sbi;
3026 sbi->s_mount_opt = 0;
Mingming Cao617ba132006-10-11 01:20:53 -07003027 sbi->s_resuid = EXT4_DEF_RESUID;
3028 sbi->s_resgid = EXT4_DEF_RESGID;
Theodore Ts'o240799c2008-10-09 23:53:47 -04003029 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
Miklos Szeredid9c9bef12007-10-16 23:26:27 -07003030 sbi->s_sb_block = sb_block;
Theodore Ts'of613dfc2010-07-27 11:56:08 -04003031 if (sb->s_bdev->bd_part)
3032 sbi->s_sectors_written_start =
3033 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003034
Theodore Ts'o9f6200b2008-09-23 09:18:24 -04003035 /* Cleanup superblock name */
3036 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
3037 *cp = '!';
3038
Cyrill Gorcunovdcc7dae2010-07-27 11:56:07 -04003039 ret = -EINVAL;
Mingming Cao617ba132006-10-11 01:20:53 -07003040 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003041 if (!blocksize) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003042 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003043 goto out_fail;
3044 }
3045
3046 /*
Mingming Cao617ba132006-10-11 01:20:53 -07003047 * The ext4 superblock will not be buffer aligned for other than 1kB
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003048 * block sizes. We need to calculate the offset from buffer start.
3049 */
Mingming Cao617ba132006-10-11 01:20:53 -07003050 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
Andrew Morton70bbb3e2006-10-11 01:21:20 -07003051 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3052 offset = do_div(logical_sb_block, blocksize);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003053 } else {
Andrew Morton70bbb3e2006-10-11 01:21:20 -07003054 logical_sb_block = sb_block;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003055 }
3056
Andrew Morton70bbb3e2006-10-11 01:21:20 -07003057 if (!(bh = sb_bread(sb, logical_sb_block))) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003058 ext4_msg(sb, KERN_ERR, "unable to read superblock");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003059 goto out_fail;
3060 }
3061 /*
3062 * Note: s_es must be initialized as soon as possible because
Mingming Cao617ba132006-10-11 01:20:53 -07003063 * some ext4 macro-instructions depend on its value
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003064 */
Mingming Cao617ba132006-10-11 01:20:53 -07003065 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003066 sbi->s_es = es;
3067 sb->s_magic = le16_to_cpu(es->s_magic);
Mingming Cao617ba132006-10-11 01:20:53 -07003068 if (sb->s_magic != EXT4_SUPER_MAGIC)
3069 goto cantfind_ext4;
Theodore Ts'oafc32f72009-02-28 19:39:58 -05003070 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003071
3072 /* Set defaults before we parse the mount options */
3073 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
Lukas Czernerbfff6872010-10-27 21:30:05 -04003074 set_opt(sbi->s_mount_opt, INIT_INODE_TABLE);
Mingming Cao617ba132006-10-11 01:20:53 -07003075 if (def_mount_opts & EXT4_DEFM_DEBUG)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003076 set_opt(sbi->s_mount_opt, DEBUG);
Dmitry Monakhov437ca0f2010-03-01 22:29:21 -05003077 if (def_mount_opts & EXT4_DEFM_BSDGROUPS) {
3078 ext4_msg(sb, KERN_WARNING, deprecated_msg, "bsdgroups",
3079 "2.6.38");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003080 set_opt(sbi->s_mount_opt, GRPID);
Dmitry Monakhov437ca0f2010-03-01 22:29:21 -05003081 }
Mingming Cao617ba132006-10-11 01:20:53 -07003082 if (def_mount_opts & EXT4_DEFM_UID16)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003083 set_opt(sbi->s_mount_opt, NO_UID32);
Theodore Ts'o03010a32008-10-10 20:02:48 -04003084#ifdef CONFIG_EXT4_FS_XATTR
Mingming Cao617ba132006-10-11 01:20:53 -07003085 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003086 set_opt(sbi->s_mount_opt, XATTR_USER);
Hugh Dickins2e7842b2007-02-10 01:46:13 -08003087#endif
Theodore Ts'o03010a32008-10-10 20:02:48 -04003088#ifdef CONFIG_EXT4_FS_POSIX_ACL
Mingming Cao617ba132006-10-11 01:20:53 -07003089 if (def_mount_opts & EXT4_DEFM_ACL)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003090 set_opt(sbi->s_mount_opt, POSIX_ACL);
Hugh Dickins2e7842b2007-02-10 01:46:13 -08003091#endif
Mingming Cao617ba132006-10-11 01:20:53 -07003092 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
Dmitry Monakhov482a7422010-02-24 11:35:32 -05003093 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
Mingming Cao617ba132006-10-11 01:20:53 -07003094 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
Dmitry Monakhov482a7422010-02-24 11:35:32 -05003095 set_opt(sbi->s_mount_opt, ORDERED_DATA);
Mingming Cao617ba132006-10-11 01:20:53 -07003096 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
Dmitry Monakhov482a7422010-02-24 11:35:32 -05003097 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003098
Mingming Cao617ba132006-10-11 01:20:53 -07003099 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003100 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
Aneesh Kumar K.Vbb4f3972008-01-28 23:58:26 -05003101 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
Dmitry Mishinceea16b2006-10-11 01:21:21 -07003102 set_opt(sbi->s_mount_opt, ERRORS_CONT);
Aneesh Kumar K.Vbb4f3972008-01-28 23:58:26 -05003103 else
3104 set_opt(sbi->s_mount_opt, ERRORS_RO);
Theodore Ts'o8b67f042010-08-01 23:14:20 -04003105 if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
3106 set_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
3107 if (def_mount_opts & EXT4_DEFM_DISCARD)
3108 set_opt(sbi->s_mount_opt, DISCARD);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003109
3110 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
3111 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
Theodore Ts'o30773842009-01-03 20:27:38 -05003112 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3113 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3114 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003115
Theodore Ts'o8b67f042010-08-01 23:14:20 -04003116 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
3117 set_opt(sbi->s_mount_opt, BARRIER);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003118
Mingming Cao1e2462f2007-07-18 09:00:55 -04003119 /*
Aneesh Kumar K.Vdd919b92008-07-11 19:27:31 -04003120 * enable delayed allocation by default
3121 * Use -o nodelalloc to turn it off
3122 */
Theodore Ts'o8b67f042010-08-01 23:14:20 -04003123 if (!IS_EXT3_SB(sb) &&
3124 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
Jan Karaba69f9a2010-03-24 20:18:37 -04003125 set_opt(sbi->s_mount_opt, DELALLOC);
Aneesh Kumar K.Vdd919b92008-07-11 19:27:31 -04003126
Theodore Ts'o8b67f042010-08-01 23:14:20 -04003127 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
3128 &journal_devnum, &journal_ioprio, NULL, 0)) {
3129 ext4_msg(sb, KERN_WARNING,
3130 "failed to parse options in superblock: %s",
3131 sbi->s_es->s_mount_opts);
3132 }
Theodore Ts'ob3881f72009-01-05 22:46:26 -05003133 if (!parse_options((char *) data, sb, &journal_devnum,
3134 &journal_ioprio, NULL, 0))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003135 goto failed_mount;
3136
3137 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
Dmitry Monakhov482a7422010-02-24 11:35:32 -05003138 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003139
Mingming Cao617ba132006-10-11 01:20:53 -07003140 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3141 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3142 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3143 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
Eric Sandeenb31e1552009-06-04 17:36:36 -04003144 ext4_msg(sb, KERN_WARNING,
3145 "feature flags set on rev 0 fs, "
3146 "running e2fsck is recommended");
Theodore Tso469108f2008-02-10 01:11:44 -05003147
3148 /*
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003149 * Check feature flags regardless of the revision level, since we
3150 * previously didn't change the revision level when setting the flags,
3151 * so there is a chance incompat flags are set on a rev 0 filesystem.
3152 */
Eric Sandeena13fb1a2009-08-18 00:20:23 -04003153 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003154 goto failed_mount;
Eric Sandeena13fb1a2009-08-18 00:20:23 -04003155
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003156 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3157
Mingming Cao617ba132006-10-11 01:20:53 -07003158 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3159 blocksize > EXT4_MAX_BLOCK_SIZE) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003160 ext4_msg(sb, KERN_ERR,
3161 "Unsupported filesystem blocksize %d", blocksize);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003162 goto failed_mount;
3163 }
3164
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003165 if (sb->s_blocksize != blocksize) {
Aneesh Kumar K.Vce407332008-01-28 23:58:27 -05003166 /* Validate the filesystem blocksize */
3167 if (!sb_set_blocksize(sb, blocksize)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003168 ext4_msg(sb, KERN_ERR, "bad block size %d",
Aneesh Kumar K.Vce407332008-01-28 23:58:27 -05003169 blocksize);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003170 goto failed_mount;
3171 }
3172
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04003173 brelse(bh);
Andrew Morton70bbb3e2006-10-11 01:21:20 -07003174 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3175 offset = do_div(logical_sb_block, blocksize);
3176 bh = sb_bread(sb, logical_sb_block);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003177 if (!bh) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003178 ext4_msg(sb, KERN_ERR,
3179 "Can't read superblock on 2nd try");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003180 goto failed_mount;
3181 }
Mingming Cao617ba132006-10-11 01:20:53 -07003182 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003183 sbi->s_es = es;
Mingming Cao617ba132006-10-11 01:20:53 -07003184 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003185 ext4_msg(sb, KERN_ERR,
3186 "Magic mismatch, very weird!");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003187 goto failed_mount;
3188 }
3189 }
3190
Eric Sandeena13fb1a2009-08-18 00:20:23 -04003191 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3192 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
Theodore Ts'of287a1a2008-10-16 22:50:48 -04003193 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3194 has_huge_files);
3195 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003196
Mingming Cao617ba132006-10-11 01:20:53 -07003197 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3198 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3199 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003200 } else {
3201 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3202 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
Mingming Cao617ba132006-10-11 01:20:53 -07003203 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
Vignesh Babu13305932007-07-18 09:11:02 -04003204 (!is_power_of_2(sbi->s_inode_size)) ||
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003205 (sbi->s_inode_size > blocksize)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003206 ext4_msg(sb, KERN_ERR,
3207 "unsupported inode size: %d",
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04003208 sbi->s_inode_size);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003209 goto failed_mount;
3210 }
Kalpak Shahef7f3832007-07-18 09:15:20 -04003211 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3212 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003213 }
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04003214
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07003215 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3216 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07003217 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07003218 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
vignesh babud8ea6cf2007-10-16 23:27:14 -07003219 !is_power_of_2(sbi->s_desc_size)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003220 ext4_msg(sb, KERN_ERR,
3221 "unsupported descriptor size %lu",
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07003222 sbi->s_desc_size);
3223 goto failed_mount;
3224 }
3225 } else
3226 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04003227
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003228 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003229 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
Andries E. Brouwerb47b6f32007-12-17 16:19:55 -08003230 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
Mingming Cao617ba132006-10-11 01:20:53 -07003231 goto cantfind_ext4;
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04003232
Mingming Cao617ba132006-10-11 01:20:53 -07003233 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003234 if (sbi->s_inodes_per_block == 0)
Mingming Cao617ba132006-10-11 01:20:53 -07003235 goto cantfind_ext4;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003236 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3237 sbi->s_inodes_per_block;
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07003238 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003239 sbi->s_sbh = bh;
3240 sbi->s_mount_state = le16_to_cpu(es->s_state);
Fengguang Wue57aa832007-10-16 23:26:25 -07003241 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3242 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04003243
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04003244 for (i = 0; i < 4; i++)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003245 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3246 sbi->s_def_hash_version = es->s_def_hash_version;
Theodore Ts'of99b2582008-10-28 13:21:44 -04003247 i = le32_to_cpu(es->s_flags);
3248 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3249 sbi->s_hash_unsigned = 3;
3250 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3251#ifdef __CHAR_UNSIGNED__
3252 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3253 sbi->s_hash_unsigned = 3;
3254#else
3255 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3256#endif
3257 sb->s_dirt = 1;
3258 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003259
3260 if (sbi->s_blocks_per_group > blocksize * 8) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003261 ext4_msg(sb, KERN_ERR,
3262 "#blocks per group too big: %lu",
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04003263 sbi->s_blocks_per_group);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003264 goto failed_mount;
3265 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003266 if (sbi->s_inodes_per_group > blocksize * 8) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003267 ext4_msg(sb, KERN_ERR,
3268 "#inodes per group too big: %lu",
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04003269 sbi->s_inodes_per_group);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003270 goto failed_mount;
3271 }
3272
Eric Sandeenbf43d842009-08-17 23:48:51 -04003273 /*
3274 * Test whether we have more sectors than will fit in sector_t,
3275 * and whether the max offset is addressable by the page cache.
3276 */
Darrick J. Wong5a9ae682010-11-19 09:56:44 -05003277 err = generic_check_addressable(sb->s_blocksize_bits,
Patrick J. LoPresti30ca22c2010-07-22 15:03:41 -07003278 ext4_blocks_count(es));
Darrick J. Wong5a9ae682010-11-19 09:56:44 -05003279 if (err) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003280 ext4_msg(sb, KERN_ERR, "filesystem"
Eric Sandeenbf43d842009-08-17 23:48:51 -04003281 " too large to mount safely on this system");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003282 if (sizeof(sector_t) < 8)
Bartlomiej Zolnierkiewicz90c699a2009-06-19 08:08:50 +02003283 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
Darrick J. Wong5a9ae682010-11-19 09:56:44 -05003284 ret = err;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003285 goto failed_mount;
3286 }
3287
Mingming Cao617ba132006-10-11 01:20:53 -07003288 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3289 goto cantfind_ext4;
Eric Sandeene7c95592008-01-28 23:58:27 -05003290
From: Thiemo Nagel0f2ddca2009-04-07 14:07:47 -04003291 /* check blocks count against device size */
3292 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3293 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003294 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3295 "exceeds size of device (%llu blocks)",
From: Thiemo Nagel0f2ddca2009-04-07 14:07:47 -04003296 ext4_blocks_count(es), blocks_count);
3297 goto failed_mount;
3298 }
3299
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04003300 /*
3301 * It makes no sense for the first data block to be beyond the end
3302 * of the filesystem.
3303 */
3304 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003305 ext4_msg(sb, KERN_WARNING, "bad geometry: first data"
3306 "block %u is beyond end of filesystem (%llu)",
3307 le32_to_cpu(es->s_first_data_block),
3308 ext4_blocks_count(es));
Eric Sandeene7c95592008-01-28 23:58:27 -05003309 goto failed_mount;
3310 }
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07003311 blocks_count = (ext4_blocks_count(es) -
3312 le32_to_cpu(es->s_first_data_block) +
3313 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3314 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
Theodore Ts'o4ec11022009-01-06 14:53:26 -05003315 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003316 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
Theodore Ts'o4ec11022009-01-06 14:53:26 -05003317 "(block count %llu, first data block %u, "
Eric Sandeenb31e1552009-06-04 17:36:36 -04003318 "blocks per group %lu)", sbi->s_groups_count,
Theodore Ts'o4ec11022009-01-06 14:53:26 -05003319 ext4_blocks_count(es),
3320 le32_to_cpu(es->s_first_data_block),
3321 EXT4_BLOCKS_PER_GROUP(sb));
3322 goto failed_mount;
3323 }
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07003324 sbi->s_groups_count = blocks_count;
Eric Sandeenfb0a3872009-09-16 14:45:10 -04003325 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3326 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
Mingming Cao617ba132006-10-11 01:20:53 -07003327 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3328 EXT4_DESC_PER_BLOCK(sb);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04003329 sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *),
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003330 GFP_KERNEL);
3331 if (sbi->s_group_desc == NULL) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003332 ext4_msg(sb, KERN_ERR, "not enough memory");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003333 goto failed_mount;
3334 }
3335
Alexander Beregalov3244fcb2008-10-12 17:27:49 -04003336#ifdef CONFIG_PROC_FS
Theodore Ts'o9f6200b2008-09-23 09:18:24 -04003337 if (ext4_proc_root)
3338 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
Alexander Beregalov3244fcb2008-10-12 17:27:49 -04003339#endif
Theodore Ts'o240799c2008-10-09 23:53:47 -04003340
Pekka Enberg705895b2009-02-15 18:07:52 -05003341 bgl_lock_init(sbi->s_blockgroup_lock);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003342
3343 for (i = 0; i < db_count; i++) {
Andrew Morton70bbb3e2006-10-11 01:21:20 -07003344 block = descriptor_loc(sb, logical_sb_block, i);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003345 sbi->s_group_desc[i] = sb_bread(sb, block);
3346 if (!sbi->s_group_desc[i]) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003347 ext4_msg(sb, KERN_ERR,
3348 "can't read group descriptor %d", i);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003349 db_count = i;
3350 goto failed_mount2;
3351 }
3352 }
Lukas Czernerbfff6872010-10-27 21:30:05 -04003353 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003354 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003355 goto failed_mount2;
3356 }
Jose R. Santos772cb7c2008-07-11 19:27:31 -04003357 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
3358 if (!ext4_fill_flex_info(sb)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003359 ext4_msg(sb, KERN_ERR,
3360 "unable to initialize "
3361 "flex_bg meta info!");
Jose R. Santos772cb7c2008-07-11 19:27:31 -04003362 goto failed_mount2;
3363 }
3364
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003365 sbi->s_gdb_count = db_count;
3366 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3367 spin_lock_init(&sbi->s_next_gen_lock);
3368
Theodore Ts'oce7e0102010-11-03 12:03:21 -04003369 err = percpu_counter_init(&sbi->s_freeblocks_counter,
3370 ext4_count_free_blocks(sb));
3371 if (!err) {
3372 err = percpu_counter_init(&sbi->s_freeinodes_counter,
3373 ext4_count_free_inodes(sb));
3374 }
3375 if (!err) {
3376 err = percpu_counter_init(&sbi->s_dirs_counter,
3377 ext4_count_dirs(sb));
3378 }
3379 if (!err) {
3380 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
3381 }
3382 if (err) {
3383 ext4_msg(sb, KERN_ERR, "insufficient memory");
3384 goto failed_mount3;
3385 }
3386
Alex Tomasc9de5602008-01-29 00:19:52 -05003387 sbi->s_stripe = ext4_get_stripe_size(sbi);
Theodore Ts'o55138e02009-09-29 13:31:31 -04003388 sbi->s_max_writeback_mb_bump = 128;
Alex Tomasc9de5602008-01-29 00:19:52 -05003389
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003390 /*
3391 * set up enough so that it can read an inode
3392 */
Theodore Ts'o9ca92382009-05-01 12:52:25 -04003393 if (!test_opt(sb, NOLOAD) &&
3394 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
3395 sb->s_op = &ext4_sops;
3396 else
3397 sb->s_op = &ext4_nojournal_sops;
Mingming Cao617ba132006-10-11 01:20:53 -07003398 sb->s_export_op = &ext4_export_ops;
3399 sb->s_xattr = ext4_xattr_handlers;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003400#ifdef CONFIG_QUOTA
Mingming Cao617ba132006-10-11 01:20:53 -07003401 sb->s_qcop = &ext4_qctl_operations;
3402 sb->dq_op = &ext4_quota_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003403#endif
3404 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
Theodore Ts'o3b9d4ed2009-04-25 22:54:04 -04003405 mutex_init(&sbi->s_orphan_lock);
Theodore Ts'o32ed5052009-04-25 22:53:39 -04003406 mutex_init(&sbi->s_resize_lock);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003407
3408 sb->s_root = NULL;
3409
3410 needs_recovery = (es->s_last_orphan != 0 ||
Mingming Cao617ba132006-10-11 01:20:53 -07003411 EXT4_HAS_INCOMPAT_FEATURE(sb,
3412 EXT4_FEATURE_INCOMPAT_RECOVER));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003413
3414 /*
3415 * The first inode we look at is the journal inode. Don't try
3416 * root first: it may be modified in the journal!
3417 */
3418 if (!test_opt(sb, NOLOAD) &&
Mingming Cao617ba132006-10-11 01:20:53 -07003419 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3420 if (ext4_load_journal(sb, es, journal_devnum))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003421 goto failed_mount3;
Frank Mayhar03901312009-01-07 00:06:22 -05003422 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3423 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003424 ext4_msg(sb, KERN_ERR, "required journal recovery "
3425 "suppressed and not mounted read-only");
Jiaying Zhang744692d2010-03-04 16:14:02 -05003426 goto failed_mount_wq;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003427 } else {
Frank Mayhar03901312009-01-07 00:06:22 -05003428 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
3429 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
3430 sbi->s_journal = NULL;
3431 needs_recovery = 0;
3432 goto no_journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003433 }
3434
Jose R. Santoseb40a092007-07-18 08:37:25 -04003435 if (ext4_blocks_count(es) > 0xffffffffULL &&
3436 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3437 JBD2_FEATURE_INCOMPAT_64BIT)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003438 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
Jiaying Zhang744692d2010-03-04 16:14:02 -05003439 goto failed_mount_wq;
Jose R. Santoseb40a092007-07-18 08:37:25 -04003440 }
3441
Linus Torvaldsd4da6c92009-11-02 10:15:27 -08003442 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3443 jbd2_journal_set_features(sbi->s_journal,
3444 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
Girish Shilamkar818d2762008-01-28 23:58:27 -05003445 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
Linus Torvaldsd4da6c92009-11-02 10:15:27 -08003446 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3447 jbd2_journal_set_features(sbi->s_journal,
3448 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
Girish Shilamkar818d2762008-01-28 23:58:27 -05003449 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3450 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
Linus Torvaldsd4da6c92009-11-02 10:15:27 -08003451 } else {
3452 jbd2_journal_clear_features(sbi->s_journal,
3453 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3454 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3455 }
Girish Shilamkar818d2762008-01-28 23:58:27 -05003456
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003457 /* We have now updated the journal if required, so we can
3458 * validate the data journaling mode. */
3459 switch (test_opt(sb, DATA_FLAGS)) {
3460 case 0:
3461 /* No mode set, assume a default based on the journal
Andrew Morton63f57932006-10-11 01:21:24 -07003462 * capabilities: ORDERED_DATA if the journal can
3463 * cope, else JOURNAL_DATA
3464 */
Mingming Caodab291a2006-10-11 01:21:01 -07003465 if (jbd2_journal_check_available_features
3466 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003467 set_opt(sbi->s_mount_opt, ORDERED_DATA);
3468 else
3469 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
3470 break;
3471
Mingming Cao617ba132006-10-11 01:20:53 -07003472 case EXT4_MOUNT_ORDERED_DATA:
3473 case EXT4_MOUNT_WRITEBACK_DATA:
Mingming Caodab291a2006-10-11 01:21:01 -07003474 if (!jbd2_journal_check_available_features
3475 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003476 ext4_msg(sb, KERN_ERR, "Journal does not support "
3477 "requested data journaling mode");
Jiaying Zhang744692d2010-03-04 16:14:02 -05003478 goto failed_mount_wq;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003479 }
3480 default:
3481 break;
3482 }
Theodore Ts'ob3881f72009-01-05 22:46:26 -05003483 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003484
Theodore Ts'oce7e0102010-11-03 12:03:21 -04003485 /*
3486 * The journal may have updated the bg summary counts, so we
3487 * need to update the global counters.
3488 */
3489 percpu_counter_set(&sbi->s_freeblocks_counter,
3490 ext4_count_free_blocks(sb));
3491 percpu_counter_set(&sbi->s_freeinodes_counter,
3492 ext4_count_free_inodes(sb));
3493 percpu_counter_set(&sbi->s_dirs_counter,
3494 ext4_count_dirs(sb));
3495 percpu_counter_set(&sbi->s_dirtyblocks_counter, 0);
Christoph Hellwig206f7ab2010-06-14 14:42:49 -04003496
Theodore Ts'oce7e0102010-11-03 12:03:21 -04003497no_journal:
Mingming Cao4c0425f2009-09-28 15:48:41 -04003498 EXT4_SB(sb)->dio_unwritten_wq = create_workqueue("ext4-dio-unwritten");
3499 if (!EXT4_SB(sb)->dio_unwritten_wq) {
3500 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
3501 goto failed_mount_wq;
3502 }
3503
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003504 /*
Mingming Caodab291a2006-10-11 01:21:01 -07003505 * The jbd2_journal_load will have done any necessary log recovery,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003506 * so we can safely mount the rest of the filesystem now.
3507 */
3508
David Howells1d1fe1e2008-02-07 00:15:37 -08003509 root = ext4_iget(sb, EXT4_ROOT_INO);
3510 if (IS_ERR(root)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003511 ext4_msg(sb, KERN_ERR, "get root inode failed");
David Howells1d1fe1e2008-02-07 00:15:37 -08003512 ret = PTR_ERR(root);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003513 goto failed_mount4;
3514 }
3515 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
David Howells1d1fe1e2008-02-07 00:15:37 -08003516 iput(root);
Eric Sandeenb31e1552009-06-04 17:36:36 -04003517 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003518 goto failed_mount4;
3519 }
David Howells1d1fe1e2008-02-07 00:15:37 -08003520 sb->s_root = d_alloc_root(root);
3521 if (!sb->s_root) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003522 ext4_msg(sb, KERN_ERR, "get root dentry failed");
David Howells1d1fe1e2008-02-07 00:15:37 -08003523 iput(root);
3524 ret = -ENOMEM;
3525 goto failed_mount4;
3526 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003527
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04003528 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
Kalpak Shahef7f3832007-07-18 09:15:20 -04003529
3530 /* determine the minimum size of new large inodes, if present */
3531 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3532 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3533 EXT4_GOOD_OLD_INODE_SIZE;
3534 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3535 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
3536 if (sbi->s_want_extra_isize <
3537 le16_to_cpu(es->s_want_extra_isize))
3538 sbi->s_want_extra_isize =
3539 le16_to_cpu(es->s_want_extra_isize);
3540 if (sbi->s_want_extra_isize <
3541 le16_to_cpu(es->s_min_extra_isize))
3542 sbi->s_want_extra_isize =
3543 le16_to_cpu(es->s_min_extra_isize);
3544 }
3545 }
3546 /* Check if enough inode space is available */
3547 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3548 sbi->s_inode_size) {
3549 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3550 EXT4_GOOD_OLD_INODE_SIZE;
Eric Sandeenb31e1552009-06-04 17:36:36 -04003551 ext4_msg(sb, KERN_INFO, "required extra inode space not"
3552 "available");
Kalpak Shahef7f3832007-07-18 09:15:20 -04003553 }
3554
Theodore Ts'o90576c02009-09-29 15:51:30 -04003555 if (test_opt(sb, DELALLOC) &&
3556 (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003557 ext4_msg(sb, KERN_WARNING, "Ignoring delalloc option - "
3558 "requested data journaling mode");
Aneesh Kumar K.Vc2774d82008-10-10 20:07:20 -04003559 clear_opt(sbi->s_mount_opt, DELALLOC);
Theodore Ts'o90576c02009-09-29 15:51:30 -04003560 }
Jiaying Zhang744692d2010-03-04 16:14:02 -05003561 if (test_opt(sb, DIOREAD_NOLOCK)) {
3562 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3563 ext4_msg(sb, KERN_WARNING, "Ignoring dioread_nolock "
3564 "option - requested data journaling mode");
3565 clear_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
3566 }
3567 if (sb->s_blocksize < PAGE_SIZE) {
3568 ext4_msg(sb, KERN_WARNING, "Ignoring dioread_nolock "
3569 "option - block size is too small");
3570 clear_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
3571 }
3572 }
Aneesh Kumar K.Vc2774d82008-10-10 20:07:20 -04003573
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04003574 err = ext4_setup_system_zone(sb);
3575 if (err) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003576 ext4_msg(sb, KERN_ERR, "failed to initialize system "
Curt Wohlgemuthfbe845d2010-05-16 13:00:00 -04003577 "zone (%d)", err);
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04003578 goto failed_mount4;
3579 }
3580
Aneesh Kumar K.Vc2774d82008-10-10 20:07:20 -04003581 ext4_ext_init(sb);
3582 err = ext4_mb_init(sb, needs_recovery);
3583 if (err) {
Uwe Kleine-König421f91d2010-06-11 12:17:00 +02003584 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
Eric Sandeenb31e1552009-06-04 17:36:36 -04003585 err);
Aneesh Kumar K.Vc2774d82008-10-10 20:07:20 -04003586 goto failed_mount4;
3587 }
3588
Lukas Czernerbfff6872010-10-27 21:30:05 -04003589 err = ext4_register_li_request(sb, first_not_zeroed);
3590 if (err)
3591 goto failed_mount4;
3592
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04003593 sbi->s_kobj.kset = ext4_kset;
3594 init_completion(&sbi->s_kobj_unregister);
3595 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
3596 "%s", sb->s_id);
3597 if (err) {
3598 ext4_mb_release(sb);
3599 ext4_ext_release(sb);
3600 goto failed_mount4;
3601 };
3602
Mingming Cao617ba132006-10-11 01:20:53 -07003603 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
3604 ext4_orphan_cleanup(sb, es);
3605 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
Frank Mayhar03901312009-01-07 00:06:22 -05003606 if (needs_recovery) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003607 ext4_msg(sb, KERN_INFO, "recovery complete");
Frank Mayhar03901312009-01-07 00:06:22 -05003608 ext4_mark_recovery_complete(sb, es);
3609 }
3610 if (EXT4_SB(sb)->s_journal) {
3611 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3612 descr = " journalled data mode";
3613 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3614 descr = " ordered data mode";
3615 else
3616 descr = " writeback data mode";
3617 } else
3618 descr = "out journal";
3619
Curt Wohlgemuthd4c402d2010-05-16 12:00:00 -04003620 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
Theodore Ts'o8b67f042010-08-01 23:14:20 -04003621 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
3622 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003623
Theodore Ts'o66e61a92010-07-27 11:56:04 -04003624 init_timer(&sbi->s_err_report);
3625 sbi->s_err_report.function = print_daily_error_info;
3626 sbi->s_err_report.data = (unsigned long) sb;
3627 if (es->s_error_count)
3628 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003629
Curt Wohlgemuthd4c402d2010-05-16 12:00:00 -04003630 kfree(orig_data);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003631 return 0;
3632
Mingming Cao617ba132006-10-11 01:20:53 -07003633cantfind_ext4:
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003634 if (!silent)
Eric Sandeenb31e1552009-06-04 17:36:36 -04003635 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003636 goto failed_mount;
3637
3638failed_mount4:
Eric Sandeenb31e1552009-06-04 17:36:36 -04003639 ext4_msg(sb, KERN_ERR, "mount failed");
Mingming Cao4c0425f2009-09-28 15:48:41 -04003640 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
3641failed_mount_wq:
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04003642 ext4_release_system_zone(sb);
Frank Mayhar03901312009-01-07 00:06:22 -05003643 if (sbi->s_journal) {
3644 jbd2_journal_destroy(sbi->s_journal);
3645 sbi->s_journal = NULL;
3646 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003647failed_mount3:
Theodore Ts'oc5ca7c72009-04-27 22:48:48 -04003648 if (sbi->s_flex_groups) {
3649 if (is_vmalloc_addr(sbi->s_flex_groups))
3650 vfree(sbi->s_flex_groups);
3651 else
3652 kfree(sbi->s_flex_groups);
3653 }
Theodore Ts'oce7e0102010-11-03 12:03:21 -04003654 percpu_counter_destroy(&sbi->s_freeblocks_counter);
3655 percpu_counter_destroy(&sbi->s_freeinodes_counter);
3656 percpu_counter_destroy(&sbi->s_dirs_counter);
3657 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003658failed_mount2:
3659 for (i = 0; i < db_count; i++)
3660 brelse(sbi->s_group_desc[i]);
3661 kfree(sbi->s_group_desc);
3662failed_mount:
Theodore Ts'o240799c2008-10-09 23:53:47 -04003663 if (sbi->s_proc) {
Theodore Ts'o9f6200b2008-09-23 09:18:24 -04003664 remove_proc_entry(sb->s_id, ext4_proc_root);
Theodore Ts'o240799c2008-10-09 23:53:47 -04003665 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003666#ifdef CONFIG_QUOTA
3667 for (i = 0; i < MAXQUOTAS; i++)
3668 kfree(sbi->s_qf_names[i]);
3669#endif
Mingming Cao617ba132006-10-11 01:20:53 -07003670 ext4_blkdev_remove(sbi);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003671 brelse(bh);
3672out_fail:
3673 sb->s_fs_info = NULL;
Manish Katiyarf6830162009-05-17 23:52:44 -04003674 kfree(sbi->s_blockgroup_lock);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003675 kfree(sbi);
Cyrill Gorcunovdcc7dae2010-07-27 11:56:07 -04003676out_free_orig:
Curt Wohlgemuthd4c402d2010-05-16 12:00:00 -04003677 kfree(orig_data);
David Howells1d1fe1e2008-02-07 00:15:37 -08003678 return ret;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003679}
3680
3681/*
3682 * Setup any per-fs journal parameters now. We'll do this both on
3683 * initial mount, once the journal has been initialised but before we've
3684 * done any recovery; and again on any subsequent remount.
3685 */
Mingming Cao617ba132006-10-11 01:20:53 -07003686static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003687{
Mingming Cao617ba132006-10-11 01:20:53 -07003688 struct ext4_sb_info *sbi = EXT4_SB(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003689
Theodore Ts'o30773842009-01-03 20:27:38 -05003690 journal->j_commit_interval = sbi->s_commit_interval;
3691 journal->j_min_batch_time = sbi->s_min_batch_time;
3692 journal->j_max_batch_time = sbi->s_max_batch_time;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003693
Theodore Ts'oa931da62010-08-03 21:35:12 -04003694 write_lock(&journal->j_state_lock);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003695 if (test_opt(sb, BARRIER))
Mingming Caodab291a2006-10-11 01:21:01 -07003696 journal->j_flags |= JBD2_BARRIER;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003697 else
Mingming Caodab291a2006-10-11 01:21:01 -07003698 journal->j_flags &= ~JBD2_BARRIER;
Hidehiro Kawai5bf56832008-10-10 22:12:43 -04003699 if (test_opt(sb, DATA_ERR_ABORT))
3700 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
3701 else
3702 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
Theodore Ts'oa931da62010-08-03 21:35:12 -04003703 write_unlock(&journal->j_state_lock);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003704}
3705
Mingming Cao617ba132006-10-11 01:20:53 -07003706static journal_t *ext4_get_journal(struct super_block *sb,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003707 unsigned int journal_inum)
3708{
3709 struct inode *journal_inode;
3710 journal_t *journal;
3711
Frank Mayhar03901312009-01-07 00:06:22 -05003712 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3713
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003714 /* First, test for the existence of a valid inode on disk. Bad
3715 * things happen if we iget() an unused inode, as the subsequent
3716 * iput() will try to delete it. */
3717
David Howells1d1fe1e2008-02-07 00:15:37 -08003718 journal_inode = ext4_iget(sb, journal_inum);
3719 if (IS_ERR(journal_inode)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003720 ext4_msg(sb, KERN_ERR, "no journal found");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003721 return NULL;
3722 }
3723 if (!journal_inode->i_nlink) {
3724 make_bad_inode(journal_inode);
3725 iput(journal_inode);
Eric Sandeenb31e1552009-06-04 17:36:36 -04003726 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003727 return NULL;
3728 }
3729
Theodore Ts'oe5f8eab82008-09-08 22:25:04 -04003730 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003731 journal_inode, journal_inode->i_size);
David Howells1d1fe1e2008-02-07 00:15:37 -08003732 if (!S_ISREG(journal_inode->i_mode)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003733 ext4_msg(sb, KERN_ERR, "invalid journal inode");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003734 iput(journal_inode);
3735 return NULL;
3736 }
3737
Mingming Caodab291a2006-10-11 01:21:01 -07003738 journal = jbd2_journal_init_inode(journal_inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003739 if (!journal) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003740 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003741 iput(journal_inode);
3742 return NULL;
3743 }
3744 journal->j_private = sb;
Mingming Cao617ba132006-10-11 01:20:53 -07003745 ext4_init_journal_params(sb, journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003746 return journal;
3747}
3748
Mingming Cao617ba132006-10-11 01:20:53 -07003749static journal_t *ext4_get_dev_journal(struct super_block *sb,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003750 dev_t j_dev)
3751{
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04003752 struct buffer_head *bh;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003753 journal_t *journal;
Mingming Cao617ba132006-10-11 01:20:53 -07003754 ext4_fsblk_t start;
3755 ext4_fsblk_t len;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003756 int hblock, blocksize;
Mingming Cao617ba132006-10-11 01:20:53 -07003757 ext4_fsblk_t sb_block;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003758 unsigned long offset;
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04003759 struct ext4_super_block *es;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003760 struct block_device *bdev;
3761
Frank Mayhar03901312009-01-07 00:06:22 -05003762 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3763
Eric Sandeenb31e1552009-06-04 17:36:36 -04003764 bdev = ext4_blkdev_get(j_dev, sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003765 if (bdev == NULL)
3766 return NULL;
3767
3768 if (bd_claim(bdev, sb)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003769 ext4_msg(sb, KERN_ERR,
3770 "failed to claim external journal device");
Al Viro9a1c3542008-02-22 20:40:24 -05003771 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003772 return NULL;
3773 }
3774
3775 blocksize = sb->s_blocksize;
Martin K. Petersene1defc42009-05-22 17:17:49 -04003776 hblock = bdev_logical_block_size(bdev);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003777 if (blocksize < hblock) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003778 ext4_msg(sb, KERN_ERR,
3779 "blocksize too small for journal device");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003780 goto out_bdev;
3781 }
3782
Mingming Cao617ba132006-10-11 01:20:53 -07003783 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
3784 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003785 set_blocksize(bdev, blocksize);
3786 if (!(bh = __bread(bdev, sb_block, blocksize))) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003787 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
3788 "external journal");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003789 goto out_bdev;
3790 }
3791
Mingming Cao617ba132006-10-11 01:20:53 -07003792 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3793 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003794 !(le32_to_cpu(es->s_feature_incompat) &
Mingming Cao617ba132006-10-11 01:20:53 -07003795 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003796 ext4_msg(sb, KERN_ERR, "external journal has "
3797 "bad superblock");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003798 brelse(bh);
3799 goto out_bdev;
3800 }
3801
Mingming Cao617ba132006-10-11 01:20:53 -07003802 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003803 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003804 brelse(bh);
3805 goto out_bdev;
3806 }
3807
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07003808 len = ext4_blocks_count(es);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003809 start = sb_block + 1;
3810 brelse(bh); /* we're done with the superblock */
3811
Mingming Caodab291a2006-10-11 01:21:01 -07003812 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003813 start, len, blocksize);
3814 if (!journal) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003815 ext4_msg(sb, KERN_ERR, "failed to create device journal");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003816 goto out_bdev;
3817 }
3818 journal->j_private = sb;
3819 ll_rw_block(READ, 1, &journal->j_sb_buffer);
3820 wait_on_buffer(journal->j_sb_buffer);
3821 if (!buffer_uptodate(journal->j_sb_buffer)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003822 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003823 goto out_journal;
3824 }
3825 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003826 ext4_msg(sb, KERN_ERR, "External journal has more than one "
3827 "user (unsupported) - %d",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003828 be32_to_cpu(journal->j_superblock->s_nr_users));
3829 goto out_journal;
3830 }
Mingming Cao617ba132006-10-11 01:20:53 -07003831 EXT4_SB(sb)->journal_bdev = bdev;
3832 ext4_init_journal_params(sb, journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003833 return journal;
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04003834
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003835out_journal:
Mingming Caodab291a2006-10-11 01:21:01 -07003836 jbd2_journal_destroy(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003837out_bdev:
Mingming Cao617ba132006-10-11 01:20:53 -07003838 ext4_blkdev_put(bdev);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003839 return NULL;
3840}
3841
Mingming Cao617ba132006-10-11 01:20:53 -07003842static int ext4_load_journal(struct super_block *sb,
3843 struct ext4_super_block *es,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003844 unsigned long journal_devnum)
3845{
3846 journal_t *journal;
3847 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
3848 dev_t journal_dev;
3849 int err = 0;
3850 int really_read_only;
3851
Frank Mayhar03901312009-01-07 00:06:22 -05003852 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3853
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003854 if (journal_devnum &&
3855 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003856 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
3857 "numbers have changed");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003858 journal_dev = new_decode_dev(journal_devnum);
3859 } else
3860 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
3861
3862 really_read_only = bdev_read_only(sb->s_bdev);
3863
3864 /*
3865 * Are we loading a blank journal or performing recovery after a
3866 * crash? For recovery, we need to check in advance whether we
3867 * can get read-write access to the device.
3868 */
Mingming Cao617ba132006-10-11 01:20:53 -07003869 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003870 if (sb->s_flags & MS_RDONLY) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003871 ext4_msg(sb, KERN_INFO, "INFO: recovery "
3872 "required on readonly filesystem");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003873 if (really_read_only) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003874 ext4_msg(sb, KERN_ERR, "write access "
3875 "unavailable, cannot proceed");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003876 return -EROFS;
3877 }
Eric Sandeenb31e1552009-06-04 17:36:36 -04003878 ext4_msg(sb, KERN_INFO, "write access will "
3879 "be enabled during recovery");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003880 }
3881 }
3882
3883 if (journal_inum && journal_dev) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003884 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
3885 "and inode journals!");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003886 return -EINVAL;
3887 }
3888
3889 if (journal_inum) {
Mingming Cao617ba132006-10-11 01:20:53 -07003890 if (!(journal = ext4_get_journal(sb, journal_inum)))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003891 return -EINVAL;
3892 } else {
Mingming Cao617ba132006-10-11 01:20:53 -07003893 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003894 return -EINVAL;
3895 }
3896
Theodore Ts'o90576c02009-09-29 15:51:30 -04003897 if (!(journal->j_flags & JBD2_BARRIER))
Eric Sandeenb31e1552009-06-04 17:36:36 -04003898 ext4_msg(sb, KERN_INFO, "barriers disabled");
Theodore Ts'o4776004f2008-09-08 23:00:52 -04003899
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003900 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
Mingming Caodab291a2006-10-11 01:21:01 -07003901 err = jbd2_journal_update_format(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003902 if (err) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003903 ext4_msg(sb, KERN_ERR, "error updating journal");
Mingming Caodab291a2006-10-11 01:21:01 -07003904 jbd2_journal_destroy(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003905 return err;
3906 }
3907 }
3908
Mingming Cao617ba132006-10-11 01:20:53 -07003909 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
Mingming Caodab291a2006-10-11 01:21:01 -07003910 err = jbd2_journal_wipe(journal, !really_read_only);
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -04003911 if (!err) {
3912 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
3913 if (save)
3914 memcpy(save, ((char *) es) +
3915 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
Mingming Caodab291a2006-10-11 01:21:01 -07003916 err = jbd2_journal_load(journal);
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -04003917 if (save)
3918 memcpy(((char *) es) + EXT4_S_ERR_START,
3919 save, EXT4_S_ERR_LEN);
3920 kfree(save);
3921 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003922
3923 if (err) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04003924 ext4_msg(sb, KERN_ERR, "error loading journal");
Mingming Caodab291a2006-10-11 01:21:01 -07003925 jbd2_journal_destroy(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003926 return err;
3927 }
3928
Mingming Cao617ba132006-10-11 01:20:53 -07003929 EXT4_SB(sb)->s_journal = journal;
3930 ext4_clear_journal_err(sb, es);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003931
Maciej Żenczykowskic41303c2010-10-27 21:30:06 -04003932 if (!really_read_only && journal_devnum &&
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003933 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
3934 es->s_journal_dev = cpu_to_le32(journal_devnum);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003935
3936 /* Make sure we flush the recovery flag to disk. */
Theodore Ts'oe2d67052009-05-01 00:33:44 -04003937 ext4_commit_super(sb, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003938 }
3939
3940 return 0;
3941}
3942
Theodore Ts'oe2d67052009-05-01 00:33:44 -04003943static int ext4_commit_super(struct super_block *sb, int sync)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003944{
Theodore Ts'oe2d67052009-05-01 00:33:44 -04003945 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
Mingming Cao617ba132006-10-11 01:20:53 -07003946 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
Takashi Satoc4be0c12009-01-09 16:40:58 -08003947 int error = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003948
3949 if (!sbh)
Takashi Satoc4be0c12009-01-09 16:40:58 -08003950 return error;
Theodore Ts'o914258b2008-10-06 21:35:40 -04003951 if (buffer_write_io_error(sbh)) {
3952 /*
3953 * Oh, dear. A previous attempt to write the
3954 * superblock failed. This could happen because the
3955 * USB device was yanked out. Or it could happen to
3956 * be a transient write error and maybe the block will
3957 * be remapped. Nothing we can do but to retry the
3958 * write and hope for the best.
3959 */
Eric Sandeenb31e1552009-06-04 17:36:36 -04003960 ext4_msg(sb, KERN_ERR, "previous I/O error to "
3961 "superblock detected");
Theodore Ts'o914258b2008-10-06 21:35:40 -04003962 clear_buffer_write_io_error(sbh);
3963 set_buffer_uptodate(sbh);
3964 }
Theodore Ts'o71290b32009-09-10 17:31:04 -04003965 /*
3966 * If the file system is mounted read-only, don't update the
3967 * superblock write time. This avoids updating the superblock
3968 * write time when we are mounting the root file system
3969 * read/only but we need to replay the journal; at that point,
3970 * for people who are east of GMT and who make their clock
3971 * tick in localtime for Windows bug-for-bug compatibility,
3972 * the clock is set in the future, and this will cause e2fsck
3973 * to complain and force a full file system check.
3974 */
3975 if (!(sb->s_flags & MS_RDONLY))
3976 es->s_wtime = cpu_to_le32(get_seconds());
Theodore Ts'of613dfc2010-07-27 11:56:08 -04003977 if (sb->s_bdev->bd_part)
3978 es->s_kbytes_written =
3979 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
Theodore Ts'oafc32f72009-02-28 19:39:58 -05003980 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
3981 EXT4_SB(sb)->s_sectors_written_start) >> 1));
Theodore Ts'of613dfc2010-07-27 11:56:08 -04003982 else
3983 es->s_kbytes_written =
3984 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
Theodore Ts'oce7e0102010-11-03 12:03:21 -04003985 ext4_free_blocks_count_set(es, percpu_counter_sum_positive(
3986 &EXT4_SB(sb)->s_freeblocks_counter));
3987 es->s_free_inodes_count =
3988 cpu_to_le32(percpu_counter_sum_positive(
3989 &EXT4_SB(sb)->s_freeinodes_counter));
Theodore Ts'o7234ab22009-04-30 21:24:04 -04003990 sb->s_dirt = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003991 BUFFER_TRACE(sbh, "marking dirty");
3992 mark_buffer_dirty(sbh);
Theodore Ts'o914258b2008-10-06 21:35:40 -04003993 if (sync) {
Takashi Satoc4be0c12009-01-09 16:40:58 -08003994 error = sync_dirty_buffer(sbh);
3995 if (error)
3996 return error;
3997
3998 error = buffer_write_io_error(sbh);
3999 if (error) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004000 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4001 "superblock");
Theodore Ts'o914258b2008-10-06 21:35:40 -04004002 clear_buffer_write_io_error(sbh);
4003 set_buffer_uptodate(sbh);
4004 }
4005 }
Takashi Satoc4be0c12009-01-09 16:40:58 -08004006 return error;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004007}
4008
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004009/*
4010 * Have we just finished recovery? If so, and if we are mounting (or
4011 * remounting) the filesystem readonly, then we will end up with a
4012 * consistent fs on disk. Record that fact.
4013 */
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04004014static void ext4_mark_recovery_complete(struct super_block *sb,
4015 struct ext4_super_block *es)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004016{
Mingming Cao617ba132006-10-11 01:20:53 -07004017 journal_t *journal = EXT4_SB(sb)->s_journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004018
Frank Mayhar03901312009-01-07 00:06:22 -05004019 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4020 BUG_ON(journal != NULL);
4021 return;
4022 }
Mingming Caodab291a2006-10-11 01:21:01 -07004023 jbd2_journal_lock_updates(journal);
Hidehiro Kawai7ffe1ea2008-10-10 20:29:21 -04004024 if (jbd2_journal_flush(journal) < 0)
4025 goto out;
4026
Mingming Cao617ba132006-10-11 01:20:53 -07004027 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004028 sb->s_flags & MS_RDONLY) {
Mingming Cao617ba132006-10-11 01:20:53 -07004029 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
Theodore Ts'oe2d67052009-05-01 00:33:44 -04004030 ext4_commit_super(sb, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004031 }
Hidehiro Kawai7ffe1ea2008-10-10 20:29:21 -04004032
4033out:
Mingming Caodab291a2006-10-11 01:21:01 -07004034 jbd2_journal_unlock_updates(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004035}
4036
4037/*
4038 * If we are mounting (or read-write remounting) a filesystem whose journal
4039 * has recorded an error from a previous lifetime, move that error to the
4040 * main filesystem now.
4041 */
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04004042static void ext4_clear_journal_err(struct super_block *sb,
4043 struct ext4_super_block *es)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004044{
4045 journal_t *journal;
4046 int j_errno;
4047 const char *errstr;
4048
Frank Mayhar03901312009-01-07 00:06:22 -05004049 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4050
Mingming Cao617ba132006-10-11 01:20:53 -07004051 journal = EXT4_SB(sb)->s_journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004052
4053 /*
4054 * Now check for any error status which may have been recorded in the
Mingming Cao617ba132006-10-11 01:20:53 -07004055 * journal by a prior ext4_error() or ext4_abort()
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004056 */
4057
Mingming Caodab291a2006-10-11 01:21:01 -07004058 j_errno = jbd2_journal_errno(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004059 if (j_errno) {
4060 char nbuf[16];
4061
Mingming Cao617ba132006-10-11 01:20:53 -07004062 errstr = ext4_decode_error(sb, j_errno, nbuf);
Eric Sandeen12062dd2010-02-15 14:19:27 -05004063 ext4_warning(sb, "Filesystem error recorded "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004064 "from previous mount: %s", errstr);
Eric Sandeen12062dd2010-02-15 14:19:27 -05004065 ext4_warning(sb, "Marking fs in need of filesystem check.");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004066
Mingming Cao617ba132006-10-11 01:20:53 -07004067 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4068 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
Theodore Ts'oe2d67052009-05-01 00:33:44 -04004069 ext4_commit_super(sb, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004070
Mingming Caodab291a2006-10-11 01:21:01 -07004071 jbd2_journal_clear_err(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004072 }
4073}
4074
4075/*
4076 * Force the running and committing transactions to commit,
4077 * and wait on the commit.
4078 */
Mingming Cao617ba132006-10-11 01:20:53 -07004079int ext4_force_commit(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004080{
4081 journal_t *journal;
Frank Mayhar03901312009-01-07 00:06:22 -05004082 int ret = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004083
4084 if (sb->s_flags & MS_RDONLY)
4085 return 0;
4086
Mingming Cao617ba132006-10-11 01:20:53 -07004087 journal = EXT4_SB(sb)->s_journal;
Eric Sandeen6b0310f2010-05-16 02:00:00 -04004088 if (journal) {
Eric Sandeen437f88c2010-08-01 17:33:29 -04004089 vfs_check_frozen(sb, SB_FREEZE_TRANS);
Frank Mayhar03901312009-01-07 00:06:22 -05004090 ret = ext4_journal_force_commit(journal);
Eric Sandeen6b0310f2010-05-16 02:00:00 -04004091 }
Frank Mayhar03901312009-01-07 00:06:22 -05004092
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004093 return ret;
4094}
4095
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04004096static void ext4_write_super(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004097{
Christoph Hellwigebc1ac12009-05-11 23:35:03 +02004098 lock_super(sb);
Theodore Ts'o9ca92382009-05-01 12:52:25 -04004099 ext4_commit_super(sb, 1);
Christoph Hellwigebc1ac12009-05-11 23:35:03 +02004100 unlock_super(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004101}
4102
Mingming Cao617ba132006-10-11 01:20:53 -07004103static int ext4_sync_fs(struct super_block *sb, int wait)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004104{
Theodore Ts'o14ce0cb2008-11-03 18:10:55 -05004105 int ret = 0;
Jan Kara9eddacf2009-02-10 06:46:05 -05004106 tid_t target;
Mingming Cao8d5d02e2009-09-28 15:48:29 -04004107 struct ext4_sb_info *sbi = EXT4_SB(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004108
Theodore Ts'o9bffad12009-06-17 11:48:11 -04004109 trace_ext4_sync_fs(sb, wait);
Mingming Cao8d5d02e2009-09-28 15:48:29 -04004110 flush_workqueue(sbi->dio_unwritten_wq);
4111 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
Theodore Ts'o9ca92382009-05-01 12:52:25 -04004112 if (wait)
Mingming Cao8d5d02e2009-09-28 15:48:29 -04004113 jbd2_log_wait_commit(sbi->s_journal, target);
Frank Mayhar03901312009-01-07 00:06:22 -05004114 }
Theodore Ts'o14ce0cb2008-11-03 18:10:55 -05004115 return ret;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004116}
4117
4118/*
4119 * LVM calls this function before a (read-only) snapshot is created. This
4120 * gives us a chance to flush the journal completely and mark the fs clean.
4121 */
Takashi Satoc4be0c12009-01-09 16:40:58 -08004122static int ext4_freeze(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004123{
Takashi Satoc4be0c12009-01-09 16:40:58 -08004124 int error = 0;
4125 journal_t *journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004126
Theodore Ts'o9ca92382009-05-01 12:52:25 -04004127 if (sb->s_flags & MS_RDONLY)
4128 return 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004129
Theodore Ts'o9ca92382009-05-01 12:52:25 -04004130 journal = EXT4_SB(sb)->s_journal;
Hidehiro Kawai7ffe1ea2008-10-10 20:29:21 -04004131
Theodore Ts'o9ca92382009-05-01 12:52:25 -04004132 /* Now we set up the journal barrier. */
4133 jbd2_journal_lock_updates(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004134
Theodore Ts'o9ca92382009-05-01 12:52:25 -04004135 /*
4136 * Don't clear the needs_recovery flag if we failed to flush
4137 * the journal.
4138 */
4139 error = jbd2_journal_flush(journal);
Eric Sandeen6b0310f2010-05-16 02:00:00 -04004140 if (error < 0)
4141 goto out;
Theodore Ts'o9ca92382009-05-01 12:52:25 -04004142
4143 /* Journal blocked and flushed, clear needs_recovery flag. */
4144 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4145 error = ext4_commit_super(sb, 1);
Eric Sandeen6b0310f2010-05-16 02:00:00 -04004146out:
4147 /* we rely on s_frozen to stop further updates */
4148 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4149 return error;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004150}
4151
4152/*
4153 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4154 * flag here, even though the filesystem is not technically dirty yet.
4155 */
Takashi Satoc4be0c12009-01-09 16:40:58 -08004156static int ext4_unfreeze(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004157{
Theodore Ts'o9ca92382009-05-01 12:52:25 -04004158 if (sb->s_flags & MS_RDONLY)
4159 return 0;
4160
4161 lock_super(sb);
4162 /* Reset the needs_recovery flag before the fs is unlocked. */
4163 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4164 ext4_commit_super(sb, 1);
4165 unlock_super(sb);
Takashi Satoc4be0c12009-01-09 16:40:58 -08004166 return 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004167}
4168
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04004169static int ext4_remount(struct super_block *sb, int *flags, char *data)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004170{
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04004171 struct ext4_super_block *es;
Mingming Cao617ba132006-10-11 01:20:53 -07004172 struct ext4_sb_info *sbi = EXT4_SB(sb);
4173 ext4_fsblk_t n_blocks_count = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004174 unsigned long old_sb_flags;
Mingming Cao617ba132006-10-11 01:20:53 -07004175 struct ext4_mount_options old_opts;
Christoph Hellwigc79d9672010-05-19 07:16:40 -04004176 int enable_quota = 0;
Theodore Ts'o8a266462008-07-26 14:34:21 -04004177 ext4_group_t g;
Theodore Ts'ob3881f72009-01-05 22:46:26 -05004178 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004179 int err;
4180#ifdef CONFIG_QUOTA
4181 int i;
4182#endif
Curt Wohlgemuthd4c402d2010-05-16 12:00:00 -04004183 char *orig_data = kstrdup(data, GFP_KERNEL);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004184
4185 /* Store the original options */
Al Virobbd68512009-05-06 10:43:07 -04004186 lock_super(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004187 old_sb_flags = sb->s_flags;
4188 old_opts.s_mount_opt = sbi->s_mount_opt;
4189 old_opts.s_resuid = sbi->s_resuid;
4190 old_opts.s_resgid = sbi->s_resgid;
4191 old_opts.s_commit_interval = sbi->s_commit_interval;
Theodore Ts'o30773842009-01-03 20:27:38 -05004192 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4193 old_opts.s_max_batch_time = sbi->s_max_batch_time;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004194#ifdef CONFIG_QUOTA
4195 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
4196 for (i = 0; i < MAXQUOTAS; i++)
4197 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
4198#endif
Theodore Ts'ob3881f72009-01-05 22:46:26 -05004199 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4200 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004201
4202 /*
4203 * Allow the "check" option to be passed as a remount option.
4204 */
Theodore Ts'ob3881f72009-01-05 22:46:26 -05004205 if (!parse_options(data, sb, NULL, &journal_ioprio,
4206 &n_blocks_count, 1)) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004207 err = -EINVAL;
4208 goto restore_opts;
4209 }
4210
Theodore Ts'o4ab2f152009-06-13 10:09:36 -04004211 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
Theodore Ts'oc67d8592010-06-29 11:07:07 -04004212 ext4_abort(sb, "Abort forced by user");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004213
4214 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
Dmitry Monakhov482a7422010-02-24 11:35:32 -05004215 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004216
4217 es = sbi->s_es;
4218
Theodore Ts'ob3881f72009-01-05 22:46:26 -05004219 if (sbi->s_journal) {
Frank Mayhar03901312009-01-07 00:06:22 -05004220 ext4_init_journal_params(sb, sbi->s_journal);
Theodore Ts'ob3881f72009-01-05 22:46:26 -05004221 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4222 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004223
4224 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07004225 n_blocks_count > ext4_blocks_count(es)) {
Theodore Ts'o4ab2f152009-06-13 10:09:36 -04004226 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004227 err = -EROFS;
4228 goto restore_opts;
4229 }
4230
4231 if (*flags & MS_RDONLY) {
Christoph Hellwig0f0dd622010-05-19 07:16:41 -04004232 err = dquot_suspend(sb, -1);
4233 if (err < 0)
Christoph Hellwigc79d9672010-05-19 07:16:40 -04004234 goto restore_opts;
Christoph Hellwigc79d9672010-05-19 07:16:40 -04004235
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004236 /*
4237 * First of all, the unconditional stuff we have to do
4238 * to disable replay of the journal when we next remount
4239 */
4240 sb->s_flags |= MS_RDONLY;
4241
4242 /*
4243 * OK, test if we are remounting a valid rw partition
4244 * readonly, and if so set the rdonly flag and then
4245 * mark the partition as valid again.
4246 */
Mingming Cao617ba132006-10-11 01:20:53 -07004247 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4248 (sbi->s_mount_state & EXT4_VALID_FS))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004249 es->s_state = cpu_to_le16(sbi->s_mount_state);
4250
Theodore Ts'oa63c9eb2009-05-01 01:59:42 -04004251 if (sbi->s_journal)
Frank Mayhar03901312009-01-07 00:06:22 -05004252 ext4_mark_recovery_complete(sb, es);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004253 } else {
Eric Sandeena13fb1a2009-08-18 00:20:23 -04004254 /* Make sure we can mount this feature set readwrite */
4255 if (!ext4_feature_set_ok(sb, 0)) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004256 err = -EROFS;
4257 goto restore_opts;
4258 }
Eric Sandeenead65962007-02-10 01:46:08 -08004259 /*
Theodore Ts'o8a266462008-07-26 14:34:21 -04004260 * Make sure the group descriptor checksums
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04004261 * are sane. If they aren't, refuse to remount r/w.
Theodore Ts'o8a266462008-07-26 14:34:21 -04004262 */
4263 for (g = 0; g < sbi->s_groups_count; g++) {
4264 struct ext4_group_desc *gdp =
4265 ext4_get_group_desc(sb, g, NULL);
4266
4267 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004268 ext4_msg(sb, KERN_ERR,
4269 "ext4_remount: Checksum for group %u failed (%u!=%u)",
Theodore Ts'o8a266462008-07-26 14:34:21 -04004270 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4271 le16_to_cpu(gdp->bg_checksum));
4272 err = -EINVAL;
4273 goto restore_opts;
4274 }
4275 }
4276
4277 /*
Eric Sandeenead65962007-02-10 01:46:08 -08004278 * If we have an unprocessed orphan list hanging
4279 * around from a previously readonly bdev mount,
4280 * require a full umount/remount for now.
4281 */
4282 if (es->s_last_orphan) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004283 ext4_msg(sb, KERN_WARNING, "Couldn't "
Eric Sandeenead65962007-02-10 01:46:08 -08004284 "remount RDWR because of unprocessed "
4285 "orphan inode list. Please "
Eric Sandeenb31e1552009-06-04 17:36:36 -04004286 "umount/remount instead");
Eric Sandeenead65962007-02-10 01:46:08 -08004287 err = -EINVAL;
4288 goto restore_opts;
4289 }
4290
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004291 /*
4292 * Mounting a RDONLY partition read-write, so reread
4293 * and store the current valid flag. (It may have
4294 * been changed by e2fsck since we originally mounted
4295 * the partition.)
4296 */
Frank Mayhar03901312009-01-07 00:06:22 -05004297 if (sbi->s_journal)
4298 ext4_clear_journal_err(sb, es);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004299 sbi->s_mount_state = le16_to_cpu(es->s_state);
Mingming Cao617ba132006-10-11 01:20:53 -07004300 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004301 goto restore_opts;
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04004302 if (!ext4_setup_super(sb, es, 0))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004303 sb->s_flags &= ~MS_RDONLY;
Christoph Hellwigc79d9672010-05-19 07:16:40 -04004304 enable_quota = 1;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004305 }
4306 }
Lukas Czernerbfff6872010-10-27 21:30:05 -04004307
4308 /*
4309 * Reinitialize lazy itable initialization thread based on
4310 * current settings
4311 */
4312 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4313 ext4_unregister_li_request(sb);
4314 else {
4315 ext4_group_t first_not_zeroed;
4316 first_not_zeroed = ext4_has_uninit_itable(sb);
4317 ext4_register_li_request(sb, first_not_zeroed);
4318 }
4319
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04004320 ext4_setup_system_zone(sb);
Frank Mayhar03901312009-01-07 00:06:22 -05004321 if (sbi->s_journal == NULL)
Theodore Ts'oe2d67052009-05-01 00:33:44 -04004322 ext4_commit_super(sb, 1);
Frank Mayhar03901312009-01-07 00:06:22 -05004323
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004324#ifdef CONFIG_QUOTA
4325 /* Release old quota file names */
4326 for (i = 0; i < MAXQUOTAS; i++)
4327 if (old_opts.s_qf_names[i] &&
4328 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4329 kfree(old_opts.s_qf_names[i]);
4330#endif
Al Virobbd68512009-05-06 10:43:07 -04004331 unlock_super(sb);
Christoph Hellwigc79d9672010-05-19 07:16:40 -04004332 if (enable_quota)
Christoph Hellwig0f0dd622010-05-19 07:16:41 -04004333 dquot_resume(sb, -1);
Curt Wohlgemuthd4c402d2010-05-16 12:00:00 -04004334
4335 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4336 kfree(orig_data);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004337 return 0;
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04004338
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004339restore_opts:
4340 sb->s_flags = old_sb_flags;
4341 sbi->s_mount_opt = old_opts.s_mount_opt;
4342 sbi->s_resuid = old_opts.s_resuid;
4343 sbi->s_resgid = old_opts.s_resgid;
4344 sbi->s_commit_interval = old_opts.s_commit_interval;
Theodore Ts'o30773842009-01-03 20:27:38 -05004345 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4346 sbi->s_max_batch_time = old_opts.s_max_batch_time;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004347#ifdef CONFIG_QUOTA
4348 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
4349 for (i = 0; i < MAXQUOTAS; i++) {
4350 if (sbi->s_qf_names[i] &&
4351 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4352 kfree(sbi->s_qf_names[i]);
4353 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4354 }
4355#endif
Al Virobbd68512009-05-06 10:43:07 -04004356 unlock_super(sb);
Curt Wohlgemuthd4c402d2010-05-16 12:00:00 -04004357 kfree(orig_data);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004358 return err;
4359}
4360
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04004361static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004362{
4363 struct super_block *sb = dentry->d_sb;
Mingming Cao617ba132006-10-11 01:20:53 -07004364 struct ext4_sb_info *sbi = EXT4_SB(sb);
4365 struct ext4_super_block *es = sbi->s_es;
Pekka Enberg960cc392006-12-06 20:35:29 -08004366 u64 fsid;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004367
Badari Pulavarty5e700302007-07-15 23:42:00 -07004368 if (test_opt(sb, MINIX_DF)) {
4369 sbi->s_overhead_last = 0;
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -04004370 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
Theodore Ts'o8df96752009-05-01 08:50:38 -04004371 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
Badari Pulavarty5e700302007-07-15 23:42:00 -07004372 ext4_fsblk_t overhead = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004373
4374 /*
Badari Pulavarty5e700302007-07-15 23:42:00 -07004375 * Compute the overhead (FS structures). This is constant
4376 * for a given filesystem unless the number of block groups
4377 * changes so we cache the previous value until it does.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004378 */
4379
4380 /*
4381 * All of the blocks before first_data_block are
4382 * overhead
4383 */
4384 overhead = le32_to_cpu(es->s_first_data_block);
4385
4386 /*
4387 * Add the overhead attributed to the superblock and
4388 * block group descriptors. If the sparse superblocks
4389 * feature is turned on, then not all groups have this.
4390 */
4391 for (i = 0; i < ngroups; i++) {
Mingming Cao617ba132006-10-11 01:20:53 -07004392 overhead += ext4_bg_has_super(sb, i) +
4393 ext4_bg_num_gdb(sb, i);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004394 cond_resched();
4395 }
4396
4397 /*
4398 * Every block group has an inode bitmap, a block
4399 * bitmap, and an inode table.
4400 */
Badari Pulavarty5e700302007-07-15 23:42:00 -07004401 overhead += ngroups * (2 + sbi->s_itb_per_group);
4402 sbi->s_overhead_last = overhead;
4403 smp_wmb();
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -04004404 sbi->s_blocks_last = ext4_blocks_count(es);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004405 }
4406
Mingming Cao617ba132006-10-11 01:20:53 -07004407 buf->f_type = EXT4_SUPER_MAGIC;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004408 buf->f_bsize = sb->s_blocksize;
Badari Pulavarty5e700302007-07-15 23:42:00 -07004409 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
Aneesh Kumar K.V6bc6e632008-10-10 09:39:00 -04004410 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) -
4411 percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07004412 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
4413 if (buf->f_bfree < ext4_r_blocks_count(es))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004414 buf->f_bavail = 0;
4415 buf->f_files = le32_to_cpu(es->s_inodes_count);
Peter Zijlstra52d9f3b2007-10-16 23:25:44 -07004416 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
Mingming Cao617ba132006-10-11 01:20:53 -07004417 buf->f_namelen = EXT4_NAME_LEN;
Pekka Enberg960cc392006-12-06 20:35:29 -08004418 fsid = le64_to_cpup((void *)es->s_uuid) ^
4419 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4420 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4421 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04004422
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004423 return 0;
4424}
4425
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04004426/* Helper function for writing quotas on sync - we need to start transaction
4427 * before quota file is locked for write. Otherwise the are possible deadlocks:
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004428 * Process 1 Process 2
Mingming Cao617ba132006-10-11 01:20:53 -07004429 * ext4_create() quota_sync()
Jan Karaa269eb12009-01-26 17:04:39 +01004430 * jbd2_journal_start() write_dquot()
Christoph Hellwig871a2932010-03-03 09:05:07 -05004431 * dquot_initialize() down(dqio_mutex)
Mingming Caodab291a2006-10-11 01:21:01 -07004432 * down(dqio_mutex) jbd2_journal_start()
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004433 *
4434 */
4435
4436#ifdef CONFIG_QUOTA
4437
4438static inline struct inode *dquot_to_inode(struct dquot *dquot)
4439{
4440 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
4441}
4442
Mingming Cao617ba132006-10-11 01:20:53 -07004443static int ext4_write_dquot(struct dquot *dquot)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004444{
4445 int ret, err;
4446 handle_t *handle;
4447 struct inode *inode;
4448
4449 inode = dquot_to_inode(dquot);
Mingming Cao617ba132006-10-11 01:20:53 -07004450 handle = ext4_journal_start(inode,
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04004451 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004452 if (IS_ERR(handle))
4453 return PTR_ERR(handle);
4454 ret = dquot_commit(dquot);
Mingming Cao617ba132006-10-11 01:20:53 -07004455 err = ext4_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004456 if (!ret)
4457 ret = err;
4458 return ret;
4459}
4460
Mingming Cao617ba132006-10-11 01:20:53 -07004461static int ext4_acquire_dquot(struct dquot *dquot)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004462{
4463 int ret, err;
4464 handle_t *handle;
4465
Mingming Cao617ba132006-10-11 01:20:53 -07004466 handle = ext4_journal_start(dquot_to_inode(dquot),
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04004467 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004468 if (IS_ERR(handle))
4469 return PTR_ERR(handle);
4470 ret = dquot_acquire(dquot);
Mingming Cao617ba132006-10-11 01:20:53 -07004471 err = ext4_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004472 if (!ret)
4473 ret = err;
4474 return ret;
4475}
4476
Mingming Cao617ba132006-10-11 01:20:53 -07004477static int ext4_release_dquot(struct dquot *dquot)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004478{
4479 int ret, err;
4480 handle_t *handle;
4481
Mingming Cao617ba132006-10-11 01:20:53 -07004482 handle = ext4_journal_start(dquot_to_inode(dquot),
Andreas Dilger0b8e58a2009-06-03 17:59:28 -04004483 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
Jan Kara9c3013e2007-09-11 15:23:29 -07004484 if (IS_ERR(handle)) {
4485 /* Release dquot anyway to avoid endless cycle in dqput() */
4486 dquot_release(dquot);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004487 return PTR_ERR(handle);
Jan Kara9c3013e2007-09-11 15:23:29 -07004488 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004489 ret = dquot_release(dquot);
Mingming Cao617ba132006-10-11 01:20:53 -07004490 err = ext4_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004491 if (!ret)
4492 ret = err;
4493 return ret;
4494}
4495
Mingming Cao617ba132006-10-11 01:20:53 -07004496static int ext4_mark_dquot_dirty(struct dquot *dquot)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004497{
Jan Kara2c8be6b2008-05-13 21:27:55 -04004498 /* Are we journaling quotas? */
Mingming Cao617ba132006-10-11 01:20:53 -07004499 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
4500 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004501 dquot_mark_dquot_dirty(dquot);
Mingming Cao617ba132006-10-11 01:20:53 -07004502 return ext4_write_dquot(dquot);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004503 } else {
4504 return dquot_mark_dquot_dirty(dquot);
4505 }
4506}
4507
Mingming Cao617ba132006-10-11 01:20:53 -07004508static int ext4_write_info(struct super_block *sb, int type)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004509{
4510 int ret, err;
4511 handle_t *handle;
4512
4513 /* Data block + inode block */
Mingming Cao617ba132006-10-11 01:20:53 -07004514 handle = ext4_journal_start(sb->s_root->d_inode, 2);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004515 if (IS_ERR(handle))
4516 return PTR_ERR(handle);
4517 ret = dquot_commit_info(sb, type);
Mingming Cao617ba132006-10-11 01:20:53 -07004518 err = ext4_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004519 if (!ret)
4520 ret = err;
4521 return ret;
4522}
4523
4524/*
4525 * Turn on quotas during mount time - we need to find
4526 * the quota file and such...
4527 */
Mingming Cao617ba132006-10-11 01:20:53 -07004528static int ext4_quota_on_mount(struct super_block *sb, int type)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004529{
Christoph Hellwig287a8092010-05-19 07:16:45 -04004530 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
4531 EXT4_SB(sb)->s_jquota_fmt, type);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004532}
4533
4534/*
4535 * Standard function to be called on quota_on
4536 */
Mingming Cao617ba132006-10-11 01:20:53 -07004537static int ext4_quota_on(struct super_block *sb, int type, int format_id,
Christoph Hellwig307ae182010-05-19 07:16:43 -04004538 char *name)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004539{
4540 int err;
Al Viro82646132008-08-02 00:57:06 -04004541 struct path path;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004542
4543 if (!test_opt(sb, QUOTA))
4544 return -EINVAL;
Jan Kara06235432008-05-13 19:11:51 -04004545
Al Viro82646132008-08-02 00:57:06 -04004546 err = kern_path(name, LOOKUP_FOLLOW, &path);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004547 if (err)
4548 return err;
Jan Kara06235432008-05-13 19:11:51 -04004549
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004550 /* Quotafile not on the same filesystem? */
Al Viro82646132008-08-02 00:57:06 -04004551 if (path.mnt->mnt_sb != sb) {
4552 path_put(&path);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004553 return -EXDEV;
4554 }
Jan Kara06235432008-05-13 19:11:51 -04004555 /* Journaling quota? */
4556 if (EXT4_SB(sb)->s_qf_names[type]) {
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04004557 /* Quotafile not in fs root? */
Al Viro82646132008-08-02 00:57:06 -04004558 if (path.dentry->d_parent != sb->s_root)
Eric Sandeenb31e1552009-06-04 17:36:36 -04004559 ext4_msg(sb, KERN_WARNING,
4560 "Quota file not on filesystem root. "
4561 "Journaled quota will not work");
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04004562 }
Jan Kara06235432008-05-13 19:11:51 -04004563
4564 /*
4565 * When we journal data on quota file, we have to flush journal to see
4566 * all updates to the file when we bypass pagecache...
4567 */
Frank Mayhar03901312009-01-07 00:06:22 -05004568 if (EXT4_SB(sb)->s_journal &&
4569 ext4_should_journal_data(path.dentry->d_inode)) {
Jan Kara06235432008-05-13 19:11:51 -04004570 /*
4571 * We don't need to lock updates but journal_flush() could
4572 * otherwise be livelocked...
4573 */
4574 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
Hidehiro Kawai7ffe1ea2008-10-10 20:29:21 -04004575 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
Jan Kara06235432008-05-13 19:11:51 -04004576 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
Hidehiro Kawai7ffe1ea2008-10-10 20:29:21 -04004577 if (err) {
Al Viro82646132008-08-02 00:57:06 -04004578 path_put(&path);
Hidehiro Kawai7ffe1ea2008-10-10 20:29:21 -04004579 return err;
4580 }
Jan Kara06235432008-05-13 19:11:51 -04004581 }
4582
Christoph Hellwig287a8092010-05-19 07:16:45 -04004583 err = dquot_quota_on_path(sb, type, format_id, &path);
Al Viro82646132008-08-02 00:57:06 -04004584 path_put(&path);
Al Viro77e69da2008-08-01 04:29:18 -04004585 return err;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004586}
4587
Dmitry Monakhovca0e05e2010-08-01 17:48:36 -04004588static int ext4_quota_off(struct super_block *sb, int type)
4589{
Dmitry Monakhov87009d82010-11-08 13:47:33 -05004590 /* Force all delayed allocation blocks to be allocated.
4591 * Caller already holds s_umount sem */
4592 if (test_opt(sb, DELALLOC))
Dmitry Monakhovca0e05e2010-08-01 17:48:36 -04004593 sync_filesystem(sb);
Dmitry Monakhovca0e05e2010-08-01 17:48:36 -04004594
4595 return dquot_quota_off(sb, type);
4596}
4597
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004598/* Read data from quotafile - avoid pagecache and such because we cannot afford
4599 * acquiring the locks... As quota files are never truncated and quota code
4600 * itself serializes the operations (and noone else should touch the files)
4601 * we don't have to be afraid of races */
Mingming Cao617ba132006-10-11 01:20:53 -07004602static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004603 size_t len, loff_t off)
4604{
4605 struct inode *inode = sb_dqopt(sb)->files[type];
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05004606 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004607 int err = 0;
4608 int offset = off & (sb->s_blocksize - 1);
4609 int tocopy;
4610 size_t toread;
4611 struct buffer_head *bh;
4612 loff_t i_size = i_size_read(inode);
4613
4614 if (off > i_size)
4615 return 0;
4616 if (off+len > i_size)
4617 len = i_size-off;
4618 toread = len;
4619 while (toread > 0) {
4620 tocopy = sb->s_blocksize - offset < toread ?
4621 sb->s_blocksize - offset : toread;
Mingming Cao617ba132006-10-11 01:20:53 -07004622 bh = ext4_bread(NULL, inode, blk, 0, &err);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004623 if (err)
4624 return err;
4625 if (!bh) /* A hole? */
4626 memset(data, 0, tocopy);
4627 else
4628 memcpy(data, bh->b_data+offset, tocopy);
4629 brelse(bh);
4630 offset = 0;
4631 toread -= tocopy;
4632 data += tocopy;
4633 blk++;
4634 }
4635 return len;
4636}
4637
4638/* Write to quotafile (we know the transaction is already started and has
4639 * enough credits) */
Mingming Cao617ba132006-10-11 01:20:53 -07004640static ssize_t ext4_quota_write(struct super_block *sb, int type,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004641 const char *data, size_t len, loff_t off)
4642{
4643 struct inode *inode = sb_dqopt(sb)->files[type];
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05004644 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004645 int err = 0;
4646 int offset = off & (sb->s_blocksize - 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004647 struct buffer_head *bh;
4648 handle_t *handle = journal_current_handle();
4649
Frank Mayhar03901312009-01-07 00:06:22 -05004650 if (EXT4_SB(sb)->s_journal && !handle) {
Eric Sandeenb31e1552009-06-04 17:36:36 -04004651 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4652 " cancelled because transaction is not started",
Jan Kara9c3013e2007-09-11 15:23:29 -07004653 (unsigned long long)off, (unsigned long long)len);
4654 return -EIO;
4655 }
Dmitry Monakhov67eeb562010-03-02 08:08:51 -05004656 /*
4657 * Since we account only one data block in transaction credits,
4658 * then it is impossible to cross a block boundary.
4659 */
4660 if (sb->s_blocksize - offset < len) {
4661 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4662 " cancelled because not block aligned",
4663 (unsigned long long)off, (unsigned long long)len);
4664 return -EIO;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004665 }
Dmitry Monakhov67eeb562010-03-02 08:08:51 -05004666
4667 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
4668 bh = ext4_bread(handle, inode, blk, 1, &err);
4669 if (!bh)
4670 goto out;
Jan Kara62d2b5f2010-07-27 11:56:07 -04004671 err = ext4_journal_get_write_access(handle, bh);
4672 if (err) {
4673 brelse(bh);
4674 goto out;
Dmitry Monakhov67eeb562010-03-02 08:08:51 -05004675 }
4676 lock_buffer(bh);
4677 memcpy(bh->b_data+offset, data, len);
4678 flush_dcache_page(bh->b_page);
4679 unlock_buffer(bh);
Jan Kara62d2b5f2010-07-27 11:56:07 -04004680 err = ext4_handle_dirty_metadata(handle, NULL, bh);
Dmitry Monakhov67eeb562010-03-02 08:08:51 -05004681 brelse(bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004682out:
Dmitry Monakhov67eeb562010-03-02 08:08:51 -05004683 if (err) {
Jan Kara4d04e4f2008-07-04 09:59:34 -07004684 mutex_unlock(&inode->i_mutex);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004685 return err;
Jan Kara4d04e4f2008-07-04 09:59:34 -07004686 }
Dmitry Monakhov67eeb562010-03-02 08:08:51 -05004687 if (inode->i_size < off + len) {
4688 i_size_write(inode, off + len);
Mingming Cao617ba132006-10-11 01:20:53 -07004689 EXT4_I(inode)->i_disksize = inode->i_size;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004690 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004691 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
Mingming Cao617ba132006-10-11 01:20:53 -07004692 ext4_mark_inode_dirty(handle, inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004693 mutex_unlock(&inode->i_mutex);
Dmitry Monakhov67eeb562010-03-02 08:08:51 -05004694 return len;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004695}
4696
4697#endif
4698
Al Viro152a0832010-07-25 00:46:55 +04004699static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
4700 const char *dev_name, void *data)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004701{
Al Viro152a0832010-07-25 00:46:55 +04004702 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004703}
4704
Theodore Ts'o37f328e2010-03-24 20:06:41 -04004705#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
Theodore Ts'o24b58422009-12-07 14:08:51 -05004706static struct file_system_type ext2_fs_type = {
4707 .owner = THIS_MODULE,
4708 .name = "ext2",
Al Viro152a0832010-07-25 00:46:55 +04004709 .mount = ext4_mount,
Theodore Ts'o24b58422009-12-07 14:08:51 -05004710 .kill_sb = kill_block_super,
4711 .fs_flags = FS_REQUIRES_DEV,
4712};
4713
4714static inline void register_as_ext2(void)
4715{
4716 int err = register_filesystem(&ext2_fs_type);
4717 if (err)
4718 printk(KERN_WARNING
4719 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
4720}
4721
4722static inline void unregister_as_ext2(void)
4723{
4724 unregister_filesystem(&ext2_fs_type);
4725}
Theodore Ts'o51b7e3c2009-12-21 10:56:09 -05004726MODULE_ALIAS("ext2");
Theodore Ts'o24b58422009-12-07 14:08:51 -05004727#else
4728static inline void register_as_ext2(void) { }
4729static inline void unregister_as_ext2(void) { }
4730#endif
4731
Theodore Ts'o37f328e2010-03-24 20:06:41 -04004732#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
Theodore Ts'o24b58422009-12-07 14:08:51 -05004733static inline void register_as_ext3(void)
4734{
4735 int err = register_filesystem(&ext3_fs_type);
4736 if (err)
4737 printk(KERN_WARNING
4738 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
4739}
4740
4741static inline void unregister_as_ext3(void)
4742{
4743 unregister_filesystem(&ext3_fs_type);
4744}
Theodore Ts'o51b7e3c2009-12-21 10:56:09 -05004745MODULE_ALIAS("ext3");
Theodore Ts'o24b58422009-12-07 14:08:51 -05004746#else
4747static inline void register_as_ext3(void) { }
4748static inline void unregister_as_ext3(void) { }
4749#endif
4750
Theodore Ts'o03010a32008-10-10 20:02:48 -04004751static struct file_system_type ext4_fs_type = {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004752 .owner = THIS_MODULE,
Theodore Ts'o03010a32008-10-10 20:02:48 -04004753 .name = "ext4",
Al Viro152a0832010-07-25 00:46:55 +04004754 .mount = ext4_mount,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004755 .kill_sb = kill_block_super,
4756 .fs_flags = FS_REQUIRES_DEV,
4757};
4758
Lukas Czerner857ac882010-10-27 21:30:05 -04004759int __init ext4_init_feat_adverts(void)
4760{
4761 struct ext4_features *ef;
4762 int ret = -ENOMEM;
4763
4764 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
4765 if (!ef)
4766 goto out;
4767
4768 ef->f_kobj.kset = ext4_kset;
4769 init_completion(&ef->f_kobj_unregister);
4770 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
4771 "features");
4772 if (ret) {
4773 kfree(ef);
4774 goto out;
4775 }
4776
4777 ext4_feat = ef;
4778 ret = 0;
4779out:
4780 return ret;
4781}
4782
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04004783static int __init ext4_init_fs(void)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004784{
Alex Tomasc9de5602008-01-29 00:19:52 -05004785 int err;
4786
Dmitry Monakhov12e9b892010-05-16 22:00:00 -04004787 ext4_check_flag_values();
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04004788 err = ext4_init_pageio();
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04004789 if (err)
4790 return err;
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04004791 err = ext4_init_system_zone();
Theodore Ts'obd2d0212010-10-27 21:30:10 -04004792 if (err)
4793 goto out5;
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04004794 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
4795 if (!ext4_kset)
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04004796 goto out4;
Theodore Ts'o9f6200b2008-09-23 09:18:24 -04004797 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
Lukas Czerner857ac882010-10-27 21:30:05 -04004798
4799 err = ext4_init_feat_adverts();
4800
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04004801 err = ext4_init_mballoc();
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004802 if (err)
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04004803 goto out3;
Alex Tomasc9de5602008-01-29 00:19:52 -05004804
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04004805 err = ext4_init_xattr();
Alex Tomasc9de5602008-01-29 00:19:52 -05004806 if (err)
4807 goto out2;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004808 err = init_inodecache();
4809 if (err)
4810 goto out1;
Theodore Ts'o24b58422009-12-07 14:08:51 -05004811 register_as_ext2();
4812 register_as_ext3();
Theodore Ts'o03010a32008-10-10 20:02:48 -04004813 err = register_filesystem(&ext4_fs_type);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004814 if (err)
4815 goto out;
Lukas Czernerbfff6872010-10-27 21:30:05 -04004816
4817 ext4_li_info = NULL;
4818 mutex_init(&ext4_li_mtx);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004819 return 0;
4820out:
Theodore Ts'o24b58422009-12-07 14:08:51 -05004821 unregister_as_ext2();
4822 unregister_as_ext3();
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004823 destroy_inodecache();
4824out1:
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04004825 ext4_exit_xattr();
Alex Tomasc9de5602008-01-29 00:19:52 -05004826out2:
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04004827 ext4_exit_mballoc();
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04004828out3:
Lukas Czerner857ac882010-10-27 21:30:05 -04004829 kfree(ext4_feat);
Theodore Ts'o6fd058f2009-05-17 15:38:01 -04004830 remove_proc_entry("fs/ext4", NULL);
4831 kset_unregister(ext4_kset);
4832out4:
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04004833 ext4_exit_system_zone();
Theodore Ts'obd2d0212010-10-27 21:30:10 -04004834out5:
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04004835 ext4_exit_pageio();
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004836 return err;
4837}
4838
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04004839static void __exit ext4_exit_fs(void)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004840{
Lukas Czernerbfff6872010-10-27 21:30:05 -04004841 ext4_destroy_lazyinit_thread();
Theodore Ts'o24b58422009-12-07 14:08:51 -05004842 unregister_as_ext2();
4843 unregister_as_ext3();
Theodore Ts'o03010a32008-10-10 20:02:48 -04004844 unregister_filesystem(&ext4_fs_type);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004845 destroy_inodecache();
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04004846 ext4_exit_xattr();
4847 ext4_exit_mballoc();
Theodore Ts'o9f6200b2008-09-23 09:18:24 -04004848 remove_proc_entry("fs/ext4", NULL);
Theodore Ts'o3197ebd2009-03-31 09:10:09 -04004849 kset_unregister(ext4_kset);
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04004850 ext4_exit_system_zone();
4851 ext4_exit_pageio();
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004852}
4853
4854MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
Theodore Ts'o83982b62009-01-06 14:53:16 -05004855MODULE_DESCRIPTION("Fourth Extended Filesystem");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07004856MODULE_LICENSE("GPL");
Theodore Ts'o5dabfc72010-10-27 21:30:14 -04004857module_init(ext4_init_fs)
4858module_exit(ext4_exit_fs)