blob: 0e829cc8a18adbaadbc470cf3912e0a9c945ae85 [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>
Mingming Caodab291a2006-10-11 01:21:01 -070023#include <linux/jbd2.h>
Mingming Cao617ba132006-10-11 01:20:53 -070024#include <linux/ext4_fs.h>
Mingming Caodab291a2006-10-11 01:21:01 -070025#include <linux/ext4_jbd2.h>
Dave Kleikampac27a0e2006-10-11 01:20:50 -070026#include <linux/slab.h>
27#include <linux/init.h>
28#include <linux/blkdev.h>
29#include <linux/parser.h>
30#include <linux/smp_lock.h>
31#include <linux/buffer_head.h>
Christoph Hellwiga5694252007-07-17 04:04:28 -070032#include <linux/exportfs.h>
Dave Kleikampac27a0e2006-10-11 01:20:50 -070033#include <linux/vfs.h>
34#include <linux/random.h>
35#include <linux/mount.h>
36#include <linux/namei.h>
37#include <linux/quotaops.h>
38#include <linux/seq_file.h>
Vignesh Babu13305932007-07-18 09:11:02 -040039#include <linux/log2.h>
Dave Kleikampac27a0e2006-10-11 01:20:50 -070040
41#include <asm/uaccess.h>
42
43#include "xattr.h"
44#include "acl.h"
45#include "namei.h"
46
Mingming Cao617ba132006-10-11 01:20:53 -070047static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
Dave Kleikampac27a0e2006-10-11 01:20:50 -070048 unsigned long journal_devnum);
Mingming Cao617ba132006-10-11 01:20:53 -070049static int ext4_create_journal(struct super_block *, struct ext4_super_block *,
Dave Kleikampac27a0e2006-10-11 01:20:50 -070050 unsigned int);
Mingming Cao617ba132006-10-11 01:20:53 -070051static void ext4_commit_super (struct super_block * sb,
52 struct ext4_super_block * es,
Dave Kleikampac27a0e2006-10-11 01:20:50 -070053 int sync);
Mingming Cao617ba132006-10-11 01:20:53 -070054static void ext4_mark_recovery_complete(struct super_block * sb,
55 struct ext4_super_block * es);
56static void ext4_clear_journal_err(struct super_block * sb,
57 struct ext4_super_block * es);
58static int ext4_sync_fs(struct super_block *sb, int wait);
59static const char *ext4_decode_error(struct super_block * sb, int errno,
Dave Kleikampac27a0e2006-10-11 01:20:50 -070060 char nbuf[16]);
Mingming Cao617ba132006-10-11 01:20:53 -070061static int ext4_remount (struct super_block * sb, int * flags, char * data);
62static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf);
63static void ext4_unlockfs(struct super_block *sb);
64static void ext4_write_super (struct super_block * sb);
65static void ext4_write_super_lockfs(struct super_block *sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -070066
Laurent Vivierbd81d8e2006-10-11 01:21:10 -070067
Alexandre Ratchov8fadc142006-10-11 01:21:15 -070068ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
69 struct ext4_group_desc *bg)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -070070{
71 return le32_to_cpu(bg->bg_block_bitmap) |
Alexandre Ratchov8fadc142006-10-11 01:21:15 -070072 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
73 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -070074}
75
Alexandre Ratchov8fadc142006-10-11 01:21:15 -070076ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
77 struct ext4_group_desc *bg)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -070078{
79 return le32_to_cpu(bg->bg_inode_bitmap) |
Alexandre Ratchov8fadc142006-10-11 01:21:15 -070080 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
81 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -070082}
83
Alexandre Ratchov8fadc142006-10-11 01:21:15 -070084ext4_fsblk_t ext4_inode_table(struct super_block *sb,
85 struct ext4_group_desc *bg)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -070086{
87 return le32_to_cpu(bg->bg_inode_table) |
Alexandre Ratchov8fadc142006-10-11 01:21:15 -070088 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
89 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -070090}
91
Alexandre Ratchov8fadc142006-10-11 01:21:15 -070092void ext4_block_bitmap_set(struct super_block *sb,
93 struct ext4_group_desc *bg, ext4_fsblk_t blk)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -070094{
95 bg->bg_block_bitmap = cpu_to_le32((u32)blk);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -070096 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
97 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -070098}
99
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700100void ext4_inode_bitmap_set(struct super_block *sb,
101 struct ext4_group_desc *bg, ext4_fsblk_t blk)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700102{
103 bg->bg_inode_bitmap = cpu_to_le32((u32)blk);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700104 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
105 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700106}
107
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700108void ext4_inode_table_set(struct super_block *sb,
109 struct ext4_group_desc *bg, ext4_fsblk_t blk)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700110{
111 bg->bg_inode_table = cpu_to_le32((u32)blk);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700112 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
113 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700114}
115
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700116/*
Mingming Caodab291a2006-10-11 01:21:01 -0700117 * Wrappers for jbd2_journal_start/end.
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700118 *
119 * The only special thing we need to do here is to make sure that all
120 * journal_end calls result in the superblock being marked dirty, so
121 * that sync() will call the filesystem's write_super callback if
122 * appropriate.
123 */
Mingming Cao617ba132006-10-11 01:20:53 -0700124handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700125{
126 journal_t *journal;
127
128 if (sb->s_flags & MS_RDONLY)
129 return ERR_PTR(-EROFS);
130
131 /* Special case here: if the journal has aborted behind our
132 * backs (eg. EIO in the commit thread), then we still need to
133 * take the FS itself readonly cleanly. */
Mingming Cao617ba132006-10-11 01:20:53 -0700134 journal = EXT4_SB(sb)->s_journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700135 if (is_journal_aborted(journal)) {
Mingming Cao617ba132006-10-11 01:20:53 -0700136 ext4_abort(sb, __FUNCTION__,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700137 "Detected aborted journal");
138 return ERR_PTR(-EROFS);
139 }
140
Mingming Caodab291a2006-10-11 01:21:01 -0700141 return jbd2_journal_start(journal, nblocks);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700142}
143
144/*
145 * The only special thing we need to do here is to make sure that all
Mingming Caodab291a2006-10-11 01:21:01 -0700146 * jbd2_journal_stop calls result in the superblock being marked dirty, so
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700147 * that sync() will call the filesystem's write_super callback if
148 * appropriate.
149 */
Mingming Cao617ba132006-10-11 01:20:53 -0700150int __ext4_journal_stop(const char *where, handle_t *handle)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700151{
152 struct super_block *sb;
153 int err;
154 int rc;
155
156 sb = handle->h_transaction->t_journal->j_private;
157 err = handle->h_err;
Mingming Caodab291a2006-10-11 01:21:01 -0700158 rc = jbd2_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700159
160 if (!err)
161 err = rc;
162 if (err)
Mingming Cao617ba132006-10-11 01:20:53 -0700163 __ext4_std_error(sb, where, err);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700164 return err;
165}
166
Mingming Cao617ba132006-10-11 01:20:53 -0700167void ext4_journal_abort_handle(const char *caller, const char *err_fn,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700168 struct buffer_head *bh, handle_t *handle, int err)
169{
170 char nbuf[16];
Mingming Cao617ba132006-10-11 01:20:53 -0700171 const char *errstr = ext4_decode_error(NULL, err, nbuf);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700172
173 if (bh)
174 BUFFER_TRACE(bh, "abort");
175
176 if (!handle->h_err)
177 handle->h_err = err;
178
179 if (is_handle_aborted(handle))
180 return;
181
182 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
183 caller, errstr, err_fn);
184
Mingming Caodab291a2006-10-11 01:21:01 -0700185 jbd2_journal_abort_handle(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700186}
187
188/* Deal with the reporting of failure conditions on a filesystem such as
189 * inconsistencies detected or read IO failures.
190 *
191 * On ext2, we can store the error state of the filesystem in the
Mingming Cao617ba132006-10-11 01:20:53 -0700192 * superblock. That is not possible on ext4, because we may have other
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700193 * write ordering constraints on the superblock which prevent us from
194 * writing it out straight away; and given that the journal is about to
195 * be aborted, we can't rely on the current, or future, transactions to
196 * write out the superblock safely.
197 *
Mingming Caodab291a2006-10-11 01:21:01 -0700198 * We'll just use the jbd2_journal_abort() error code to record an error in
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700199 * the journal instead. On recovery, the journal will compain about
200 * that error until we've noted it down and cleared it.
201 */
202
Mingming Cao617ba132006-10-11 01:20:53 -0700203static void ext4_handle_error(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700204{
Mingming Cao617ba132006-10-11 01:20:53 -0700205 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700206
Mingming Cao617ba132006-10-11 01:20:53 -0700207 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
208 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700209
210 if (sb->s_flags & MS_RDONLY)
211 return;
212
213 if (!test_opt (sb, ERRORS_CONT)) {
Mingming Cao617ba132006-10-11 01:20:53 -0700214 journal_t *journal = EXT4_SB(sb)->s_journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700215
Mingming Cao617ba132006-10-11 01:20:53 -0700216 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700217 if (journal)
Mingming Caodab291a2006-10-11 01:21:01 -0700218 jbd2_journal_abort(journal, -EIO);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700219 }
220 if (test_opt (sb, ERRORS_RO)) {
221 printk (KERN_CRIT "Remounting filesystem read-only\n");
222 sb->s_flags |= MS_RDONLY;
223 }
Mingming Cao617ba132006-10-11 01:20:53 -0700224 ext4_commit_super(sb, es, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700225 if (test_opt(sb, ERRORS_PANIC))
Mingming Cao617ba132006-10-11 01:20:53 -0700226 panic("EXT4-fs (device %s): panic forced after error\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700227 sb->s_id);
228}
229
Mingming Cao617ba132006-10-11 01:20:53 -0700230void ext4_error (struct super_block * sb, const char * function,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700231 const char * fmt, ...)
232{
233 va_list args;
234
235 va_start(args, fmt);
Mingming Cao617ba132006-10-11 01:20:53 -0700236 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700237 vprintk(fmt, args);
238 printk("\n");
239 va_end(args);
240
Mingming Cao617ba132006-10-11 01:20:53 -0700241 ext4_handle_error(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700242}
243
Mingming Cao617ba132006-10-11 01:20:53 -0700244static const char *ext4_decode_error(struct super_block * sb, int errno,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700245 char nbuf[16])
246{
247 char *errstr = NULL;
248
249 switch (errno) {
250 case -EIO:
251 errstr = "IO failure";
252 break;
253 case -ENOMEM:
254 errstr = "Out of memory";
255 break;
256 case -EROFS:
Mingming Caodab291a2006-10-11 01:21:01 -0700257 if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700258 errstr = "Journal has aborted";
259 else
260 errstr = "Readonly filesystem";
261 break;
262 default:
263 /* If the caller passed in an extra buffer for unknown
264 * errors, textualise them now. Else we just return
265 * NULL. */
266 if (nbuf) {
267 /* Check for truncated error codes... */
268 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
269 errstr = nbuf;
270 }
271 break;
272 }
273
274 return errstr;
275}
276
Mingming Cao617ba132006-10-11 01:20:53 -0700277/* __ext4_std_error decodes expected errors from journaling functions
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700278 * automatically and invokes the appropriate error response. */
279
Mingming Cao617ba132006-10-11 01:20:53 -0700280void __ext4_std_error (struct super_block * sb, const char * function,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700281 int errno)
282{
283 char nbuf[16];
284 const char *errstr;
285
286 /* Special case: if the error is EROFS, and we're not already
287 * inside a transaction, then there's really no point in logging
288 * an error. */
289 if (errno == -EROFS && journal_current_handle() == NULL &&
290 (sb->s_flags & MS_RDONLY))
291 return;
292
Mingming Cao617ba132006-10-11 01:20:53 -0700293 errstr = ext4_decode_error(sb, errno, nbuf);
294 printk (KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700295 sb->s_id, function, errstr);
296
Mingming Cao617ba132006-10-11 01:20:53 -0700297 ext4_handle_error(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700298}
299
300/*
Mingming Cao617ba132006-10-11 01:20:53 -0700301 * ext4_abort is a much stronger failure handler than ext4_error. The
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700302 * abort function may be used to deal with unrecoverable failures such
303 * as journal IO errors or ENOMEM at a critical moment in log management.
304 *
305 * We unconditionally force the filesystem into an ABORT|READONLY state,
306 * unless the error response on the fs has been set to panic in which
307 * case we take the easy way out and panic immediately.
308 */
309
Mingming Cao617ba132006-10-11 01:20:53 -0700310void ext4_abort (struct super_block * sb, const char * function,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700311 const char * fmt, ...)
312{
313 va_list args;
314
Mingming Cao617ba132006-10-11 01:20:53 -0700315 printk (KERN_CRIT "ext4_abort called.\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700316
317 va_start(args, fmt);
Mingming Cao617ba132006-10-11 01:20:53 -0700318 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700319 vprintk(fmt, args);
320 printk("\n");
321 va_end(args);
322
323 if (test_opt(sb, ERRORS_PANIC))
Mingming Cao617ba132006-10-11 01:20:53 -0700324 panic("EXT4-fs panic from previous error\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700325
326 if (sb->s_flags & MS_RDONLY)
327 return;
328
329 printk(KERN_CRIT "Remounting filesystem read-only\n");
Mingming Cao617ba132006-10-11 01:20:53 -0700330 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700331 sb->s_flags |= MS_RDONLY;
Mingming Cao617ba132006-10-11 01:20:53 -0700332 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
Mingming Caodab291a2006-10-11 01:21:01 -0700333 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700334}
335
Mingming Cao617ba132006-10-11 01:20:53 -0700336void ext4_warning (struct super_block * sb, const char * function,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700337 const char * fmt, ...)
338{
339 va_list args;
340
341 va_start(args, fmt);
Mingming Cao617ba132006-10-11 01:20:53 -0700342 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ",
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700343 sb->s_id, function);
344 vprintk(fmt, args);
345 printk("\n");
346 va_end(args);
347}
348
Mingming Cao617ba132006-10-11 01:20:53 -0700349void ext4_update_dynamic_rev(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700350{
Mingming Cao617ba132006-10-11 01:20:53 -0700351 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700352
Mingming Cao617ba132006-10-11 01:20:53 -0700353 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700354 return;
355
Mingming Cao617ba132006-10-11 01:20:53 -0700356 ext4_warning(sb, __FUNCTION__,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700357 "updating to rev %d because of new feature flag, "
358 "running e2fsck is recommended",
Mingming Cao617ba132006-10-11 01:20:53 -0700359 EXT4_DYNAMIC_REV);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700360
Mingming Cao617ba132006-10-11 01:20:53 -0700361 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
362 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
363 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700364 /* leave es->s_feature_*compat flags alone */
365 /* es->s_uuid will be set by e2fsck if empty */
366
367 /*
368 * The rest of the superblock fields should be zero, and if not it
369 * means they are likely already in use, so leave them alone. We
370 * can leave it up to e2fsck to clean up any inconsistencies there.
371 */
372}
373
374/*
375 * Open the external journal device
376 */
Mingming Cao617ba132006-10-11 01:20:53 -0700377static struct block_device *ext4_blkdev_get(dev_t dev)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700378{
379 struct block_device *bdev;
380 char b[BDEVNAME_SIZE];
381
382 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
383 if (IS_ERR(bdev))
384 goto fail;
385 return bdev;
386
387fail:
Mingming Cao617ba132006-10-11 01:20:53 -0700388 printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700389 __bdevname(dev, b), PTR_ERR(bdev));
390 return NULL;
391}
392
393/*
394 * Release the journal device
395 */
Mingming Cao617ba132006-10-11 01:20:53 -0700396static int ext4_blkdev_put(struct block_device *bdev)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700397{
398 bd_release(bdev);
399 return blkdev_put(bdev);
400}
401
Mingming Cao617ba132006-10-11 01:20:53 -0700402static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700403{
404 struct block_device *bdev;
405 int ret = -ENODEV;
406
407 bdev = sbi->journal_bdev;
408 if (bdev) {
Mingming Cao617ba132006-10-11 01:20:53 -0700409 ret = ext4_blkdev_put(bdev);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700410 sbi->journal_bdev = NULL;
411 }
412 return ret;
413}
414
415static inline struct inode *orphan_list_entry(struct list_head *l)
416{
Mingming Cao617ba132006-10-11 01:20:53 -0700417 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700418}
419
Mingming Cao617ba132006-10-11 01:20:53 -0700420static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700421{
422 struct list_head *l;
423
424 printk(KERN_ERR "sb orphan head is %d\n",
425 le32_to_cpu(sbi->s_es->s_last_orphan));
426
427 printk(KERN_ERR "sb_info orphan list:\n");
428 list_for_each(l, &sbi->s_orphan) {
429 struct inode *inode = orphan_list_entry(l);
430 printk(KERN_ERR " "
431 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
432 inode->i_sb->s_id, inode->i_ino, inode,
433 inode->i_mode, inode->i_nlink,
434 NEXT_ORPHAN(inode));
435 }
436}
437
Mingming Cao617ba132006-10-11 01:20:53 -0700438static void ext4_put_super (struct super_block * sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700439{
Mingming Cao617ba132006-10-11 01:20:53 -0700440 struct ext4_sb_info *sbi = EXT4_SB(sb);
441 struct ext4_super_block *es = sbi->s_es;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700442 int i;
443
Alex Tomasa86c6182006-10-11 01:21:03 -0700444 ext4_ext_release(sb);
Mingming Cao617ba132006-10-11 01:20:53 -0700445 ext4_xattr_put_super(sb);
Mingming Caodab291a2006-10-11 01:21:01 -0700446 jbd2_journal_destroy(sbi->s_journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700447 if (!(sb->s_flags & MS_RDONLY)) {
Mingming Cao617ba132006-10-11 01:20:53 -0700448 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700449 es->s_state = cpu_to_le16(sbi->s_mount_state);
450 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
451 mark_buffer_dirty(sbi->s_sbh);
Mingming Cao617ba132006-10-11 01:20:53 -0700452 ext4_commit_super(sb, es, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700453 }
454
455 for (i = 0; i < sbi->s_gdb_count; i++)
456 brelse(sbi->s_group_desc[i]);
457 kfree(sbi->s_group_desc);
458 percpu_counter_destroy(&sbi->s_freeblocks_counter);
459 percpu_counter_destroy(&sbi->s_freeinodes_counter);
460 percpu_counter_destroy(&sbi->s_dirs_counter);
461 brelse(sbi->s_sbh);
462#ifdef CONFIG_QUOTA
463 for (i = 0; i < MAXQUOTAS; i++)
464 kfree(sbi->s_qf_names[i]);
465#endif
466
467 /* Debugging code just in case the in-memory inode orphan list
468 * isn't empty. The on-disk one can be non-empty if we've
469 * detected an error and taken the fs readonly, but the
470 * in-memory list had better be clean by this point. */
471 if (!list_empty(&sbi->s_orphan))
472 dump_orphan_list(sb, sbi);
473 J_ASSERT(list_empty(&sbi->s_orphan));
474
Peter Zijlstraf98393a2007-05-06 14:49:54 -0700475 invalidate_bdev(sb->s_bdev);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700476 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
477 /*
478 * Invalidate the journal device's buffers. We don't want them
479 * floating about in memory - the physical journal device may
480 * hotswapped, and it breaks the `ro-after' testing code.
481 */
482 sync_blockdev(sbi->journal_bdev);
Peter Zijlstraf98393a2007-05-06 14:49:54 -0700483 invalidate_bdev(sbi->journal_bdev);
Mingming Cao617ba132006-10-11 01:20:53 -0700484 ext4_blkdev_remove(sbi);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700485 }
486 sb->s_fs_info = NULL;
487 kfree(sbi);
488 return;
489}
490
Christoph Lametere18b8902006-12-06 20:33:20 -0800491static struct kmem_cache *ext4_inode_cachep;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700492
493/*
494 * Called inside transaction, so use GFP_NOFS
495 */
Mingming Cao617ba132006-10-11 01:20:53 -0700496static struct inode *ext4_alloc_inode(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700497{
Mingming Cao617ba132006-10-11 01:20:53 -0700498 struct ext4_inode_info *ei;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700499
Christoph Lametere6b4f8d2006-12-06 20:33:14 -0800500 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700501 if (!ei)
502 return NULL;
Mingming Cao617ba132006-10-11 01:20:53 -0700503#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
504 ei->i_acl = EXT4_ACL_NOT_CACHED;
505 ei->i_default_acl = EXT4_ACL_NOT_CACHED;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700506#endif
507 ei->i_block_alloc_info = NULL;
508 ei->vfs_inode.i_version = 1;
Alex Tomasa86c6182006-10-11 01:21:03 -0700509 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700510 return &ei->vfs_inode;
511}
512
Mingming Cao617ba132006-10-11 01:20:53 -0700513static void ext4_destroy_inode(struct inode *inode)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700514{
Vasily Averin9f7dd932007-07-15 23:40:45 -0700515 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
516 printk("EXT4 Inode %p: orphan list check failed!\n",
517 EXT4_I(inode));
518 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
519 EXT4_I(inode), sizeof(struct ext4_inode_info),
520 true);
521 dump_stack();
522 }
Mingming Cao617ba132006-10-11 01:20:53 -0700523 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700524}
525
Christoph Lameter4ba9b9d2007-10-16 23:25:51 -0700526static void init_once(struct kmem_cache *cachep, void *foo)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700527{
Mingming Cao617ba132006-10-11 01:20:53 -0700528 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700529
Christoph Lametera35afb82007-05-16 22:10:57 -0700530 INIT_LIST_HEAD(&ei->i_orphan);
Mingming Cao617ba132006-10-11 01:20:53 -0700531#ifdef CONFIG_EXT4DEV_FS_XATTR
Christoph Lametera35afb82007-05-16 22:10:57 -0700532 init_rwsem(&ei->xattr_sem);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700533#endif
Christoph Lametera35afb82007-05-16 22:10:57 -0700534 mutex_init(&ei->truncate_mutex);
535 inode_init_once(&ei->vfs_inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700536}
537
538static int init_inodecache(void)
539{
Mingming Cao617ba132006-10-11 01:20:53 -0700540 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
541 sizeof(struct ext4_inode_info),
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700542 0, (SLAB_RECLAIM_ACCOUNT|
543 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900544 init_once);
Mingming Cao617ba132006-10-11 01:20:53 -0700545 if (ext4_inode_cachep == NULL)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700546 return -ENOMEM;
547 return 0;
548}
549
550static void destroy_inodecache(void)
551{
Mingming Cao617ba132006-10-11 01:20:53 -0700552 kmem_cache_destroy(ext4_inode_cachep);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700553}
554
Mingming Cao617ba132006-10-11 01:20:53 -0700555static void ext4_clear_inode(struct inode *inode)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700556{
Mingming Cao617ba132006-10-11 01:20:53 -0700557 struct ext4_block_alloc_info *rsv = EXT4_I(inode)->i_block_alloc_info;
558#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
559 if (EXT4_I(inode)->i_acl &&
560 EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) {
561 posix_acl_release(EXT4_I(inode)->i_acl);
562 EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700563 }
Mingming Cao617ba132006-10-11 01:20:53 -0700564 if (EXT4_I(inode)->i_default_acl &&
565 EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) {
566 posix_acl_release(EXT4_I(inode)->i_default_acl);
567 EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700568 }
569#endif
Mingming Cao617ba132006-10-11 01:20:53 -0700570 ext4_discard_reservation(inode);
571 EXT4_I(inode)->i_block_alloc_info = NULL;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700572 if (unlikely(rsv))
573 kfree(rsv);
574}
575
Mingming Cao617ba132006-10-11 01:20:53 -0700576static inline void ext4_show_quota_options(struct seq_file *seq, struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700577{
578#if defined(CONFIG_QUOTA)
Mingming Cao617ba132006-10-11 01:20:53 -0700579 struct ext4_sb_info *sbi = EXT4_SB(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700580
581 if (sbi->s_jquota_fmt)
582 seq_printf(seq, ",jqfmt=%s",
583 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
584
585 if (sbi->s_qf_names[USRQUOTA])
586 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
587
588 if (sbi->s_qf_names[GRPQUOTA])
589 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
590
Mingming Cao617ba132006-10-11 01:20:53 -0700591 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700592 seq_puts(seq, ",usrquota");
593
Mingming Cao617ba132006-10-11 01:20:53 -0700594 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700595 seq_puts(seq, ",grpquota");
596#endif
597}
598
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700599/*
600 * Show an option if
601 * - it's set to a non-default value OR
602 * - if the per-sb default is different from the global default
603 */
Mingming Cao617ba132006-10-11 01:20:53 -0700604static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700605{
606 struct super_block *sb = vfs->mnt_sb;
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700607 struct ext4_sb_info *sbi = EXT4_SB(sb);
608 struct ext4_super_block *es = sbi->s_es;
609 unsigned long def_mount_opts;
610
611 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
612
613 if (sbi->s_sb_block != 1)
614 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
615 if (test_opt(sb, MINIX_DF))
616 seq_puts(seq, ",minixdf");
617 if (test_opt(sb, GRPID))
618 seq_puts(seq, ",grpid");
619 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
620 seq_puts(seq, ",nogrpid");
621 if (sbi->s_resuid != EXT4_DEF_RESUID ||
622 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
623 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
624 }
625 if (sbi->s_resgid != EXT4_DEF_RESGID ||
626 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
627 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
628 }
629 if (test_opt(sb, ERRORS_CONT)) {
630 int def_errors = le16_to_cpu(es->s_errors);
631
632 if (def_errors == EXT4_ERRORS_PANIC ||
633 def_errors == EXT4_ERRORS_RO) {
634 seq_puts(seq, ",errors=continue");
635 }
636 }
637 if (test_opt(sb, ERRORS_RO))
638 seq_puts(seq, ",errors=remount-ro");
639 if (test_opt(sb, ERRORS_PANIC))
640 seq_puts(seq, ",errors=panic");
641 if (test_opt(sb, NO_UID32))
642 seq_puts(seq, ",nouid32");
643 if (test_opt(sb, DEBUG))
644 seq_puts(seq, ",debug");
645 if (test_opt(sb, OLDALLOC))
646 seq_puts(seq, ",oldalloc");
647#ifdef CONFIG_EXT4_FS_XATTR
648 if (test_opt(sb, XATTR_USER))
649 seq_puts(seq, ",user_xattr");
650 if (!test_opt(sb, XATTR_USER) &&
651 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
652 seq_puts(seq, ",nouser_xattr");
653 }
654#endif
655#ifdef CONFIG_EXT4_FS_POSIX_ACL
656 if (test_opt(sb, POSIX_ACL))
657 seq_puts(seq, ",acl");
658 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
659 seq_puts(seq, ",noacl");
660#endif
661 if (!test_opt(sb, RESERVATION))
662 seq_puts(seq, ",noreservation");
663 if (sbi->s_commit_interval) {
664 seq_printf(seq, ",commit=%u",
665 (unsigned) (sbi->s_commit_interval / HZ));
666 }
667 if (test_opt(sb, BARRIER))
668 seq_puts(seq, ",barrier=1");
669 if (test_opt(sb, NOBH))
670 seq_puts(seq, ",nobh");
671 if (!test_opt(sb, EXTENTS))
672 seq_puts(seq, ",noextents");
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700673
Mingming Cao617ba132006-10-11 01:20:53 -0700674 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700675 seq_puts(seq, ",data=journal");
Mingming Cao617ba132006-10-11 01:20:53 -0700676 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700677 seq_puts(seq, ",data=ordered");
Mingming Cao617ba132006-10-11 01:20:53 -0700678 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700679 seq_puts(seq, ",data=writeback");
680
Mingming Cao617ba132006-10-11 01:20:53 -0700681 ext4_show_quota_options(seq, sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700682
683 return 0;
684}
685
686
Mingming Cao617ba132006-10-11 01:20:53 -0700687static struct dentry *ext4_get_dentry(struct super_block *sb, void *vobjp)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700688{
689 __u32 *objp = vobjp;
690 unsigned long ino = objp[0];
691 __u32 generation = objp[1];
692 struct inode *inode;
693 struct dentry *result;
694
Mingming Cao617ba132006-10-11 01:20:53 -0700695 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700696 return ERR_PTR(-ESTALE);
Mingming Cao617ba132006-10-11 01:20:53 -0700697 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700698 return ERR_PTR(-ESTALE);
699
700 /* iget isn't really right if the inode is currently unallocated!!
701 *
Mingming Cao617ba132006-10-11 01:20:53 -0700702 * ext4_read_inode will return a bad_inode if the inode had been
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700703 * deleted, so we should be safe.
704 *
705 * Currently we don't know the generation for parent directory, so
706 * a generation of 0 means "accept any"
707 */
708 inode = iget(sb, ino);
709 if (inode == NULL)
710 return ERR_PTR(-ENOMEM);
711 if (is_bad_inode(inode) ||
712 (generation && inode->i_generation != generation)) {
713 iput(inode);
714 return ERR_PTR(-ESTALE);
715 }
716 /* now to find a dentry.
717 * If possible, get a well-connected one
718 */
719 result = d_alloc_anon(inode);
720 if (!result) {
721 iput(inode);
722 return ERR_PTR(-ENOMEM);
723 }
724 return result;
725}
726
727#ifdef CONFIG_QUOTA
728#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
729#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
730
Mingming Cao617ba132006-10-11 01:20:53 -0700731static int ext4_dquot_initialize(struct inode *inode, int type);
732static int ext4_dquot_drop(struct inode *inode);
733static int ext4_write_dquot(struct dquot *dquot);
734static int ext4_acquire_dquot(struct dquot *dquot);
735static int ext4_release_dquot(struct dquot *dquot);
736static int ext4_mark_dquot_dirty(struct dquot *dquot);
737static int ext4_write_info(struct super_block *sb, int type);
738static int ext4_quota_on(struct super_block *sb, int type, int format_id, char *path);
739static int ext4_quota_on_mount(struct super_block *sb, int type);
740static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700741 size_t len, loff_t off);
Mingming Cao617ba132006-10-11 01:20:53 -0700742static ssize_t ext4_quota_write(struct super_block *sb, int type,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700743 const char *data, size_t len, loff_t off);
744
Mingming Cao617ba132006-10-11 01:20:53 -0700745static struct dquot_operations ext4_quota_operations = {
746 .initialize = ext4_dquot_initialize,
747 .drop = ext4_dquot_drop,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700748 .alloc_space = dquot_alloc_space,
749 .alloc_inode = dquot_alloc_inode,
750 .free_space = dquot_free_space,
751 .free_inode = dquot_free_inode,
752 .transfer = dquot_transfer,
Mingming Cao617ba132006-10-11 01:20:53 -0700753 .write_dquot = ext4_write_dquot,
754 .acquire_dquot = ext4_acquire_dquot,
755 .release_dquot = ext4_release_dquot,
756 .mark_dirty = ext4_mark_dquot_dirty,
757 .write_info = ext4_write_info
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700758};
759
Mingming Cao617ba132006-10-11 01:20:53 -0700760static struct quotactl_ops ext4_qctl_operations = {
761 .quota_on = ext4_quota_on,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700762 .quota_off = vfs_quota_off,
763 .quota_sync = vfs_quota_sync,
764 .get_info = vfs_get_dqinfo,
765 .set_info = vfs_set_dqinfo,
766 .get_dqblk = vfs_get_dqblk,
767 .set_dqblk = vfs_set_dqblk
768};
769#endif
770
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800771static const struct super_operations ext4_sops = {
Mingming Cao617ba132006-10-11 01:20:53 -0700772 .alloc_inode = ext4_alloc_inode,
773 .destroy_inode = ext4_destroy_inode,
774 .read_inode = ext4_read_inode,
775 .write_inode = ext4_write_inode,
776 .dirty_inode = ext4_dirty_inode,
777 .delete_inode = ext4_delete_inode,
778 .put_super = ext4_put_super,
779 .write_super = ext4_write_super,
780 .sync_fs = ext4_sync_fs,
781 .write_super_lockfs = ext4_write_super_lockfs,
782 .unlockfs = ext4_unlockfs,
783 .statfs = ext4_statfs,
784 .remount_fs = ext4_remount,
785 .clear_inode = ext4_clear_inode,
786 .show_options = ext4_show_options,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700787#ifdef CONFIG_QUOTA
Mingming Cao617ba132006-10-11 01:20:53 -0700788 .quota_read = ext4_quota_read,
789 .quota_write = ext4_quota_write,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700790#endif
791};
792
Mingming Cao617ba132006-10-11 01:20:53 -0700793static struct export_operations ext4_export_ops = {
794 .get_parent = ext4_get_parent,
795 .get_dentry = ext4_get_dentry,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700796};
797
798enum {
799 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
800 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
801 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
802 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
803 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
804 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
805 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
806 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
807 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
808 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
Mingming Cao1e2462f2007-07-18 09:00:55 -0400809 Opt_grpquota, Opt_extents, Opt_noextents,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700810};
811
812static match_table_t tokens = {
813 {Opt_bsd_df, "bsddf"},
814 {Opt_minix_df, "minixdf"},
815 {Opt_grpid, "grpid"},
816 {Opt_grpid, "bsdgroups"},
817 {Opt_nogrpid, "nogrpid"},
818 {Opt_nogrpid, "sysvgroups"},
819 {Opt_resgid, "resgid=%u"},
820 {Opt_resuid, "resuid=%u"},
821 {Opt_sb, "sb=%u"},
822 {Opt_err_cont, "errors=continue"},
823 {Opt_err_panic, "errors=panic"},
824 {Opt_err_ro, "errors=remount-ro"},
825 {Opt_nouid32, "nouid32"},
826 {Opt_nocheck, "nocheck"},
827 {Opt_nocheck, "check=none"},
828 {Opt_debug, "debug"},
829 {Opt_oldalloc, "oldalloc"},
830 {Opt_orlov, "orlov"},
831 {Opt_user_xattr, "user_xattr"},
832 {Opt_nouser_xattr, "nouser_xattr"},
833 {Opt_acl, "acl"},
834 {Opt_noacl, "noacl"},
835 {Opt_reservation, "reservation"},
836 {Opt_noreservation, "noreservation"},
837 {Opt_noload, "noload"},
838 {Opt_nobh, "nobh"},
839 {Opt_bh, "bh"},
840 {Opt_commit, "commit=%u"},
841 {Opt_journal_update, "journal=update"},
842 {Opt_journal_inum, "journal=%u"},
843 {Opt_journal_dev, "journal_dev=%u"},
844 {Opt_abort, "abort"},
845 {Opt_data_journal, "data=journal"},
846 {Opt_data_ordered, "data=ordered"},
847 {Opt_data_writeback, "data=writeback"},
848 {Opt_offusrjquota, "usrjquota="},
849 {Opt_usrjquota, "usrjquota=%s"},
850 {Opt_offgrpjquota, "grpjquota="},
851 {Opt_grpjquota, "grpjquota=%s"},
852 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
853 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
854 {Opt_grpquota, "grpquota"},
855 {Opt_noquota, "noquota"},
856 {Opt_quota, "quota"},
857 {Opt_usrquota, "usrquota"},
858 {Opt_barrier, "barrier=%u"},
Alex Tomasa86c6182006-10-11 01:21:03 -0700859 {Opt_extents, "extents"},
Mingming Cao1e2462f2007-07-18 09:00:55 -0400860 {Opt_noextents, "noextents"},
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700861 {Opt_err, NULL},
862 {Opt_resize, "resize"},
863};
864
Mingming Cao617ba132006-10-11 01:20:53 -0700865static ext4_fsblk_t get_sb_block(void **data)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700866{
Mingming Cao617ba132006-10-11 01:20:53 -0700867 ext4_fsblk_t sb_block;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700868 char *options = (char *) *data;
869
870 if (!options || strncmp(options, "sb=", 3) != 0)
871 return 1; /* Default location */
872 options += 3;
Mingming Cao617ba132006-10-11 01:20:53 -0700873 /*todo: use simple_strtoll with >32bit ext4 */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700874 sb_block = simple_strtoul(options, &options, 0);
875 if (*options && *options != ',') {
Mingming Cao617ba132006-10-11 01:20:53 -0700876 printk("EXT4-fs: Invalid sb specification: %s\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700877 (char *) *data);
878 return 1;
879 }
880 if (*options == ',')
881 options++;
882 *data = (void *) options;
883 return sb_block;
884}
885
886static int parse_options (char *options, struct super_block *sb,
887 unsigned int *inum, unsigned long *journal_devnum,
Mingming Cao617ba132006-10-11 01:20:53 -0700888 ext4_fsblk_t *n_blocks_count, int is_remount)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700889{
Mingming Cao617ba132006-10-11 01:20:53 -0700890 struct ext4_sb_info *sbi = EXT4_SB(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700891 char * p;
892 substring_t args[MAX_OPT_ARGS];
893 int data_opt = 0;
894 int option;
895#ifdef CONFIG_QUOTA
896 int qtype;
897 char *qname;
898#endif
899
900 if (!options)
901 return 1;
902
903 while ((p = strsep (&options, ",")) != NULL) {
904 int token;
905 if (!*p)
906 continue;
907
908 token = match_token(p, tokens, args);
909 switch (token) {
910 case Opt_bsd_df:
911 clear_opt (sbi->s_mount_opt, MINIX_DF);
912 break;
913 case Opt_minix_df:
914 set_opt (sbi->s_mount_opt, MINIX_DF);
915 break;
916 case Opt_grpid:
917 set_opt (sbi->s_mount_opt, GRPID);
918 break;
919 case Opt_nogrpid:
920 clear_opt (sbi->s_mount_opt, GRPID);
921 break;
922 case Opt_resuid:
923 if (match_int(&args[0], &option))
924 return 0;
925 sbi->s_resuid = option;
926 break;
927 case Opt_resgid:
928 if (match_int(&args[0], &option))
929 return 0;
930 sbi->s_resgid = option;
931 break;
932 case Opt_sb:
933 /* handled by get_sb_block() instead of here */
934 /* *sb_block = match_int(&args[0]); */
935 break;
936 case Opt_err_panic:
937 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
938 clear_opt (sbi->s_mount_opt, ERRORS_RO);
939 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
940 break;
941 case Opt_err_ro:
942 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
943 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
944 set_opt (sbi->s_mount_opt, ERRORS_RO);
945 break;
946 case Opt_err_cont:
947 clear_opt (sbi->s_mount_opt, ERRORS_RO);
948 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
949 set_opt (sbi->s_mount_opt, ERRORS_CONT);
950 break;
951 case Opt_nouid32:
952 set_opt (sbi->s_mount_opt, NO_UID32);
953 break;
954 case Opt_nocheck:
955 clear_opt (sbi->s_mount_opt, CHECK);
956 break;
957 case Opt_debug:
958 set_opt (sbi->s_mount_opt, DEBUG);
959 break;
960 case Opt_oldalloc:
961 set_opt (sbi->s_mount_opt, OLDALLOC);
962 break;
963 case Opt_orlov:
964 clear_opt (sbi->s_mount_opt, OLDALLOC);
965 break;
Mingming Cao617ba132006-10-11 01:20:53 -0700966#ifdef CONFIG_EXT4DEV_FS_XATTR
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700967 case Opt_user_xattr:
968 set_opt (sbi->s_mount_opt, XATTR_USER);
969 break;
970 case Opt_nouser_xattr:
971 clear_opt (sbi->s_mount_opt, XATTR_USER);
972 break;
973#else
974 case Opt_user_xattr:
975 case Opt_nouser_xattr:
Mingming Cao617ba132006-10-11 01:20:53 -0700976 printk("EXT4 (no)user_xattr options not supported\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700977 break;
978#endif
Mingming Cao617ba132006-10-11 01:20:53 -0700979#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700980 case Opt_acl:
981 set_opt(sbi->s_mount_opt, POSIX_ACL);
982 break;
983 case Opt_noacl:
984 clear_opt(sbi->s_mount_opt, POSIX_ACL);
985 break;
986#else
987 case Opt_acl:
988 case Opt_noacl:
Mingming Cao617ba132006-10-11 01:20:53 -0700989 printk("EXT4 (no)acl options not supported\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700990 break;
991#endif
992 case Opt_reservation:
993 set_opt(sbi->s_mount_opt, RESERVATION);
994 break;
995 case Opt_noreservation:
996 clear_opt(sbi->s_mount_opt, RESERVATION);
997 break;
998 case Opt_journal_update:
999 /* @@@ FIXME */
1000 /* Eventually we will want to be able to create
1001 a journal file here. For now, only allow the
1002 user to specify an existing inode to be the
1003 journal file. */
1004 if (is_remount) {
Mingming Cao617ba132006-10-11 01:20:53 -07001005 printk(KERN_ERR "EXT4-fs: cannot specify "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001006 "journal on remount\n");
1007 return 0;
1008 }
1009 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1010 break;
1011 case Opt_journal_inum:
1012 if (is_remount) {
Mingming Cao617ba132006-10-11 01:20:53 -07001013 printk(KERN_ERR "EXT4-fs: cannot specify "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001014 "journal on remount\n");
1015 return 0;
1016 }
1017 if (match_int(&args[0], &option))
1018 return 0;
1019 *inum = option;
1020 break;
1021 case Opt_journal_dev:
1022 if (is_remount) {
Mingming Cao617ba132006-10-11 01:20:53 -07001023 printk(KERN_ERR "EXT4-fs: cannot specify "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001024 "journal on remount\n");
1025 return 0;
1026 }
1027 if (match_int(&args[0], &option))
1028 return 0;
1029 *journal_devnum = option;
1030 break;
1031 case Opt_noload:
1032 set_opt (sbi->s_mount_opt, NOLOAD);
1033 break;
1034 case Opt_commit:
1035 if (match_int(&args[0], &option))
1036 return 0;
1037 if (option < 0)
1038 return 0;
1039 if (option == 0)
1040 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1041 sbi->s_commit_interval = HZ * option;
1042 break;
1043 case Opt_data_journal:
Mingming Cao617ba132006-10-11 01:20:53 -07001044 data_opt = EXT4_MOUNT_JOURNAL_DATA;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001045 goto datacheck;
1046 case Opt_data_ordered:
Mingming Cao617ba132006-10-11 01:20:53 -07001047 data_opt = EXT4_MOUNT_ORDERED_DATA;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001048 goto datacheck;
1049 case Opt_data_writeback:
Mingming Cao617ba132006-10-11 01:20:53 -07001050 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001051 datacheck:
1052 if (is_remount) {
Mingming Cao617ba132006-10-11 01:20:53 -07001053 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001054 != data_opt) {
1055 printk(KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001056 "EXT4-fs: cannot change data "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001057 "mode on remount\n");
1058 return 0;
1059 }
1060 } else {
Mingming Cao617ba132006-10-11 01:20:53 -07001061 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001062 sbi->s_mount_opt |= data_opt;
1063 }
1064 break;
1065#ifdef CONFIG_QUOTA
1066 case Opt_usrjquota:
1067 qtype = USRQUOTA;
1068 goto set_qf_name;
1069 case Opt_grpjquota:
1070 qtype = GRPQUOTA;
1071set_qf_name:
1072 if (sb_any_quota_enabled(sb)) {
1073 printk(KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001074 "EXT4-fs: Cannot change journalled "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001075 "quota options when quota turned on.\n");
1076 return 0;
1077 }
1078 qname = match_strdup(&args[0]);
1079 if (!qname) {
1080 printk(KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001081 "EXT4-fs: not enough memory for "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001082 "storing quotafile name.\n");
1083 return 0;
1084 }
1085 if (sbi->s_qf_names[qtype] &&
1086 strcmp(sbi->s_qf_names[qtype], qname)) {
1087 printk(KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001088 "EXT4-fs: %s quota file already "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001089 "specified.\n", QTYPE2NAME(qtype));
1090 kfree(qname);
1091 return 0;
1092 }
1093 sbi->s_qf_names[qtype] = qname;
1094 if (strchr(sbi->s_qf_names[qtype], '/')) {
1095 printk(KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001096 "EXT4-fs: quotafile must be on "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001097 "filesystem root.\n");
1098 kfree(sbi->s_qf_names[qtype]);
1099 sbi->s_qf_names[qtype] = NULL;
1100 return 0;
1101 }
1102 set_opt(sbi->s_mount_opt, QUOTA);
1103 break;
1104 case Opt_offusrjquota:
1105 qtype = USRQUOTA;
1106 goto clear_qf_name;
1107 case Opt_offgrpjquota:
1108 qtype = GRPQUOTA;
1109clear_qf_name:
1110 if (sb_any_quota_enabled(sb)) {
Mingming Cao617ba132006-10-11 01:20:53 -07001111 printk(KERN_ERR "EXT4-fs: Cannot change "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001112 "journalled quota options when "
1113 "quota turned on.\n");
1114 return 0;
1115 }
1116 /*
1117 * The space will be released later when all options
1118 * are confirmed to be correct
1119 */
1120 sbi->s_qf_names[qtype] = NULL;
1121 break;
1122 case Opt_jqfmt_vfsold:
1123 sbi->s_jquota_fmt = QFMT_VFS_OLD;
1124 break;
1125 case Opt_jqfmt_vfsv0:
1126 sbi->s_jquota_fmt = QFMT_VFS_V0;
1127 break;
1128 case Opt_quota:
1129 case Opt_usrquota:
1130 set_opt(sbi->s_mount_opt, QUOTA);
1131 set_opt(sbi->s_mount_opt, USRQUOTA);
1132 break;
1133 case Opt_grpquota:
1134 set_opt(sbi->s_mount_opt, QUOTA);
1135 set_opt(sbi->s_mount_opt, GRPQUOTA);
1136 break;
1137 case Opt_noquota:
1138 if (sb_any_quota_enabled(sb)) {
Mingming Cao617ba132006-10-11 01:20:53 -07001139 printk(KERN_ERR "EXT4-fs: Cannot change quota "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001140 "options when quota turned on.\n");
1141 return 0;
1142 }
1143 clear_opt(sbi->s_mount_opt, QUOTA);
1144 clear_opt(sbi->s_mount_opt, USRQUOTA);
1145 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1146 break;
1147#else
1148 case Opt_quota:
1149 case Opt_usrquota:
1150 case Opt_grpquota:
1151 case Opt_usrjquota:
1152 case Opt_grpjquota:
1153 case Opt_offusrjquota:
1154 case Opt_offgrpjquota:
1155 case Opt_jqfmt_vfsold:
1156 case Opt_jqfmt_vfsv0:
1157 printk(KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001158 "EXT4-fs: journalled quota options not "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001159 "supported.\n");
1160 break;
1161 case Opt_noquota:
1162 break;
1163#endif
1164 case Opt_abort:
1165 set_opt(sbi->s_mount_opt, ABORT);
1166 break;
1167 case Opt_barrier:
1168 if (match_int(&args[0], &option))
1169 return 0;
1170 if (option)
1171 set_opt(sbi->s_mount_opt, BARRIER);
1172 else
1173 clear_opt(sbi->s_mount_opt, BARRIER);
1174 break;
1175 case Opt_ignore:
1176 break;
1177 case Opt_resize:
1178 if (!is_remount) {
Mingming Cao617ba132006-10-11 01:20:53 -07001179 printk("EXT4-fs: resize option only available "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001180 "for remount\n");
1181 return 0;
1182 }
1183 if (match_int(&args[0], &option) != 0)
1184 return 0;
1185 *n_blocks_count = option;
1186 break;
1187 case Opt_nobh:
1188 set_opt(sbi->s_mount_opt, NOBH);
1189 break;
1190 case Opt_bh:
1191 clear_opt(sbi->s_mount_opt, NOBH);
1192 break;
Alex Tomasa86c6182006-10-11 01:21:03 -07001193 case Opt_extents:
1194 set_opt (sbi->s_mount_opt, EXTENTS);
1195 break;
Mingming Cao1e2462f2007-07-18 09:00:55 -04001196 case Opt_noextents:
1197 clear_opt (sbi->s_mount_opt, EXTENTS);
1198 break;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001199 default:
1200 printk (KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001201 "EXT4-fs: Unrecognized mount option \"%s\" "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001202 "or missing value\n", p);
1203 return 0;
1204 }
1205 }
1206#ifdef CONFIG_QUOTA
1207 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
Mingming Cao617ba132006-10-11 01:20:53 -07001208 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001209 sbi->s_qf_names[USRQUOTA])
1210 clear_opt(sbi->s_mount_opt, USRQUOTA);
1211
Mingming Cao617ba132006-10-11 01:20:53 -07001212 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001213 sbi->s_qf_names[GRPQUOTA])
1214 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1215
1216 if ((sbi->s_qf_names[USRQUOTA] &&
Mingming Cao617ba132006-10-11 01:20:53 -07001217 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001218 (sbi->s_qf_names[GRPQUOTA] &&
Mingming Cao617ba132006-10-11 01:20:53 -07001219 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
1220 printk(KERN_ERR "EXT4-fs: old and new quota "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001221 "format mixing.\n");
1222 return 0;
1223 }
1224
1225 if (!sbi->s_jquota_fmt) {
Mingming Cao617ba132006-10-11 01:20:53 -07001226 printk(KERN_ERR "EXT4-fs: journalled quota format "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001227 "not specified.\n");
1228 return 0;
1229 }
1230 } else {
1231 if (sbi->s_jquota_fmt) {
Mingming Cao617ba132006-10-11 01:20:53 -07001232 printk(KERN_ERR "EXT4-fs: journalled quota format "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001233 "specified with no journalling "
1234 "enabled.\n");
1235 return 0;
1236 }
1237 }
1238#endif
1239 return 1;
1240}
1241
Mingming Cao617ba132006-10-11 01:20:53 -07001242static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001243 int read_only)
1244{
Mingming Cao617ba132006-10-11 01:20:53 -07001245 struct ext4_sb_info *sbi = EXT4_SB(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001246 int res = 0;
1247
Mingming Cao617ba132006-10-11 01:20:53 -07001248 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1249 printk (KERN_ERR "EXT4-fs warning: revision level too high, "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001250 "forcing read-only mode\n");
1251 res = MS_RDONLY;
1252 }
1253 if (read_only)
1254 return res;
Mingming Cao617ba132006-10-11 01:20:53 -07001255 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1256 printk (KERN_WARNING "EXT4-fs warning: mounting unchecked fs, "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001257 "running e2fsck is recommended\n");
Mingming Cao617ba132006-10-11 01:20:53 -07001258 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001259 printk (KERN_WARNING
Mingming Cao617ba132006-10-11 01:20:53 -07001260 "EXT4-fs warning: mounting fs with errors, "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001261 "running e2fsck is recommended\n");
1262 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1263 le16_to_cpu(es->s_mnt_count) >=
1264 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1265 printk (KERN_WARNING
Mingming Cao617ba132006-10-11 01:20:53 -07001266 "EXT4-fs warning: maximal mount count reached, "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001267 "running e2fsck is recommended\n");
1268 else if (le32_to_cpu(es->s_checkinterval) &&
1269 (le32_to_cpu(es->s_lastcheck) +
1270 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1271 printk (KERN_WARNING
Mingming Cao617ba132006-10-11 01:20:53 -07001272 "EXT4-fs warning: checktime reached, "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001273 "running e2fsck is recommended\n");
1274#if 0
1275 /* @@@ We _will_ want to clear the valid bit if we find
Andrew Morton63f57932006-10-11 01:21:24 -07001276 * inconsistencies, to force a fsck at reboot. But for
1277 * a plain journaled filesystem we can keep it set as
1278 * valid forever! :)
1279 */
Mingming Cao617ba132006-10-11 01:20:53 -07001280 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT4_VALID_FS);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001281#endif
1282 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
Mingming Cao617ba132006-10-11 01:20:53 -07001283 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001284 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
1285 es->s_mtime = cpu_to_le32(get_seconds());
Mingming Cao617ba132006-10-11 01:20:53 -07001286 ext4_update_dynamic_rev(sb);
1287 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001288
Mingming Cao617ba132006-10-11 01:20:53 -07001289 ext4_commit_super(sb, es, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001290 if (test_opt(sb, DEBUG))
Mingming Cao617ba132006-10-11 01:20:53 -07001291 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001292 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1293 sb->s_blocksize,
1294 sbi->s_groups_count,
Mingming Cao617ba132006-10-11 01:20:53 -07001295 EXT4_BLOCKS_PER_GROUP(sb),
1296 EXT4_INODES_PER_GROUP(sb),
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001297 sbi->s_mount_opt);
1298
Mingming Cao617ba132006-10-11 01:20:53 -07001299 printk(KERN_INFO "EXT4 FS on %s, ", sb->s_id);
1300 if (EXT4_SB(sb)->s_journal->j_inode == NULL) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001301 char b[BDEVNAME_SIZE];
1302
1303 printk("external journal on %s\n",
Mingming Cao617ba132006-10-11 01:20:53 -07001304 bdevname(EXT4_SB(sb)->s_journal->j_dev, b));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001305 } else {
1306 printk("internal journal\n");
1307 }
1308 return res;
1309}
1310
1311/* Called at mount-time, super-block is locked */
Mingming Cao617ba132006-10-11 01:20:53 -07001312static int ext4_check_descriptors (struct super_block * sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001313{
Mingming Cao617ba132006-10-11 01:20:53 -07001314 struct ext4_sb_info *sbi = EXT4_SB(sb);
1315 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1316 ext4_fsblk_t last_block;
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001317 ext4_fsblk_t block_bitmap;
1318 ext4_fsblk_t inode_bitmap;
1319 ext4_fsblk_t inode_table;
Mingming Cao617ba132006-10-11 01:20:53 -07001320 struct ext4_group_desc * gdp = NULL;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001321 int desc_block = 0;
1322 int i;
1323
Mingming Cao617ba132006-10-11 01:20:53 -07001324 ext4_debug ("Checking group descriptors");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001325
1326 for (i = 0; i < sbi->s_groups_count; i++)
1327 {
1328 if (i == sbi->s_groups_count - 1)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001329 last_block = ext4_blocks_count(sbi->s_es) - 1;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001330 else
1331 last_block = first_block +
Mingming Cao617ba132006-10-11 01:20:53 -07001332 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001333
Mingming Cao617ba132006-10-11 01:20:53 -07001334 if ((i % EXT4_DESC_PER_BLOCK(sb)) == 0)
1335 gdp = (struct ext4_group_desc *)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001336 sbi->s_group_desc[desc_block++]->b_data;
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07001337 block_bitmap = ext4_block_bitmap(sb, gdp);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001338 if (block_bitmap < first_block || block_bitmap > last_block)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001339 {
Mingming Cao617ba132006-10-11 01:20:53 -07001340 ext4_error (sb, "ext4_check_descriptors",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001341 "Block bitmap for group %d"
Mingming Cao2ae02102006-10-11 01:21:11 -07001342 " not in group (block %llu)!",
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001343 i, block_bitmap);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001344 return 0;
1345 }
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07001346 inode_bitmap = ext4_inode_bitmap(sb, gdp);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001347 if (inode_bitmap < first_block || inode_bitmap > last_block)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001348 {
Mingming Cao617ba132006-10-11 01:20:53 -07001349 ext4_error (sb, "ext4_check_descriptors",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001350 "Inode bitmap for group %d"
Mingming Cao2ae02102006-10-11 01:21:11 -07001351 " not in group (block %llu)!",
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001352 i, inode_bitmap);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001353 return 0;
1354 }
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07001355 inode_table = ext4_inode_table(sb, gdp);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001356 if (inode_table < first_block ||
Eric Sandeen780dcdb2007-07-26 10:41:11 -07001357 inode_table + sbi->s_itb_per_group - 1 > last_block)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001358 {
Mingming Cao617ba132006-10-11 01:20:53 -07001359 ext4_error (sb, "ext4_check_descriptors",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001360 "Inode table for group %d"
Mingming Cao2ae02102006-10-11 01:21:11 -07001361 " not in group (block %llu)!",
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001362 i, inode_table);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001363 return 0;
1364 }
Mingming Cao617ba132006-10-11 01:20:53 -07001365 first_block += EXT4_BLOCKS_PER_GROUP(sb);
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07001366 gdp = (struct ext4_group_desc *)
1367 ((__u8 *)gdp + EXT4_DESC_SIZE(sb));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001368 }
1369
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001370 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
Mingming Cao617ba132006-10-11 01:20:53 -07001371 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext4_count_free_inodes(sb));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001372 return 1;
1373}
1374
1375
Mingming Cao617ba132006-10-11 01:20:53 -07001376/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001377 * the superblock) which were deleted from all directories, but held open by
1378 * a process at the time of a crash. We walk the list and try to delete these
1379 * inodes at recovery time (only with a read-write filesystem).
1380 *
1381 * In order to keep the orphan inode chain consistent during traversal (in
1382 * case of crash during recovery), we link each inode into the superblock
1383 * orphan list_head and handle it the same way as an inode deletion during
1384 * normal operation (which journals the operations for us).
1385 *
1386 * We only do an iget() and an iput() on each inode, which is very safe if we
1387 * accidentally point at an in-use or already deleted inode. The worst that
1388 * can happen in this case is that we get a "bit already cleared" message from
Mingming Cao617ba132006-10-11 01:20:53 -07001389 * ext4_free_inode(). The only reason we would point at a wrong inode is if
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001390 * e2fsck was run on this filesystem, and it must have already done the orphan
1391 * inode cleanup for us, so we can safely abort without any further action.
1392 */
Mingming Cao617ba132006-10-11 01:20:53 -07001393static void ext4_orphan_cleanup (struct super_block * sb,
1394 struct ext4_super_block * es)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001395{
1396 unsigned int s_flags = sb->s_flags;
1397 int nr_orphans = 0, nr_truncates = 0;
1398#ifdef CONFIG_QUOTA
1399 int i;
1400#endif
1401 if (!es->s_last_orphan) {
1402 jbd_debug(4, "no orphan inodes to clean up\n");
1403 return;
1404 }
1405
Eric Sandeena8f48a92006-12-06 20:40:13 -08001406 if (bdev_read_only(sb->s_bdev)) {
1407 printk(KERN_ERR "EXT4-fs: write access "
1408 "unavailable, skipping orphan cleanup.\n");
1409 return;
1410 }
1411
Mingming Cao617ba132006-10-11 01:20:53 -07001412 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001413 if (es->s_last_orphan)
1414 jbd_debug(1, "Errors on filesystem, "
1415 "clearing orphan list.\n");
1416 es->s_last_orphan = 0;
1417 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1418 return;
1419 }
1420
1421 if (s_flags & MS_RDONLY) {
Mingming Cao617ba132006-10-11 01:20:53 -07001422 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001423 sb->s_id);
1424 sb->s_flags &= ~MS_RDONLY;
1425 }
1426#ifdef CONFIG_QUOTA
1427 /* Needed for iput() to work correctly and not trash data */
1428 sb->s_flags |= MS_ACTIVE;
1429 /* Turn on quotas so that they are updated correctly */
1430 for (i = 0; i < MAXQUOTAS; i++) {
Mingming Cao617ba132006-10-11 01:20:53 -07001431 if (EXT4_SB(sb)->s_qf_names[i]) {
1432 int ret = ext4_quota_on_mount(sb, i);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001433 if (ret < 0)
1434 printk(KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001435 "EXT4-fs: Cannot turn on journalled "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001436 "quota: error %d\n", ret);
1437 }
1438 }
1439#endif
1440
1441 while (es->s_last_orphan) {
1442 struct inode *inode;
1443
1444 if (!(inode =
Mingming Cao617ba132006-10-11 01:20:53 -07001445 ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001446 es->s_last_orphan = 0;
1447 break;
1448 }
1449
Mingming Cao617ba132006-10-11 01:20:53 -07001450 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001451 DQUOT_INIT(inode);
1452 if (inode->i_nlink) {
1453 printk(KERN_DEBUG
1454 "%s: truncating inode %lu to %Ld bytes\n",
1455 __FUNCTION__, inode->i_ino, inode->i_size);
1456 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1457 inode->i_ino, inode->i_size);
Mingming Cao617ba132006-10-11 01:20:53 -07001458 ext4_truncate(inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001459 nr_truncates++;
1460 } else {
1461 printk(KERN_DEBUG
1462 "%s: deleting unreferenced inode %lu\n",
1463 __FUNCTION__, inode->i_ino);
1464 jbd_debug(2, "deleting unreferenced inode %lu\n",
1465 inode->i_ino);
1466 nr_orphans++;
1467 }
1468 iput(inode); /* The delete magic happens here! */
1469 }
1470
1471#define PLURAL(x) (x), ((x)==1) ? "" : "s"
1472
1473 if (nr_orphans)
Mingming Cao617ba132006-10-11 01:20:53 -07001474 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001475 sb->s_id, PLURAL(nr_orphans));
1476 if (nr_truncates)
Mingming Cao617ba132006-10-11 01:20:53 -07001477 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001478 sb->s_id, PLURAL(nr_truncates));
1479#ifdef CONFIG_QUOTA
1480 /* Turn quotas off */
1481 for (i = 0; i < MAXQUOTAS; i++) {
1482 if (sb_dqopt(sb)->files[i])
1483 vfs_quota_off(sb, i);
1484 }
1485#endif
1486 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1487}
1488
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001489/*
1490 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1491 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1492 * We need to be 1 filesystem block less than the 2^32 sector limit.
1493 */
Mingming Cao617ba132006-10-11 01:20:53 -07001494static loff_t ext4_max_size(int bits)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001495{
Mingming Cao617ba132006-10-11 01:20:53 -07001496 loff_t res = EXT4_NDIR_BLOCKS;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001497 /* This constant is calculated to be the largest file size for a
1498 * dense, 4k-blocksize file such that the total number of
1499 * sectors in the file, including data and all indirect blocks,
1500 * does not exceed 2^32. */
1501 const loff_t upper_limit = 0x1ff7fffd000LL;
1502
1503 res += 1LL << (bits-2);
1504 res += 1LL << (2*(bits-2));
1505 res += 1LL << (3*(bits-2));
1506 res <<= bits;
1507 if (res > upper_limit)
1508 res = upper_limit;
1509 return res;
1510}
1511
Mingming Cao617ba132006-10-11 01:20:53 -07001512static ext4_fsblk_t descriptor_loc(struct super_block *sb,
Andrew Morton70bbb3e2006-10-11 01:21:20 -07001513 ext4_fsblk_t logical_sb_block, int nr)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001514{
Mingming Cao617ba132006-10-11 01:20:53 -07001515 struct ext4_sb_info *sbi = EXT4_SB(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001516 unsigned long bg, first_meta_bg;
1517 int has_super = 0;
1518
1519 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1520
Mingming Cao617ba132006-10-11 01:20:53 -07001521 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001522 nr < first_meta_bg)
Andrew Morton70bbb3e2006-10-11 01:21:20 -07001523 return logical_sb_block + nr + 1;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001524 bg = sbi->s_desc_per_block * nr;
Mingming Cao617ba132006-10-11 01:20:53 -07001525 if (ext4_bg_has_super(sb, bg))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001526 has_super = 1;
Mingming Cao617ba132006-10-11 01:20:53 -07001527 return (has_super + ext4_group_first_block_no(sb, bg));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001528}
1529
1530
Mingming Cao617ba132006-10-11 01:20:53 -07001531static int ext4_fill_super (struct super_block *sb, void *data, int silent)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001532{
1533 struct buffer_head * bh;
Mingming Cao617ba132006-10-11 01:20:53 -07001534 struct ext4_super_block *es = NULL;
1535 struct ext4_sb_info *sbi;
1536 ext4_fsblk_t block;
1537 ext4_fsblk_t sb_block = get_sb_block(&data);
Andrew Morton70bbb3e2006-10-11 01:21:20 -07001538 ext4_fsblk_t logical_sb_block;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001539 unsigned long offset = 0;
1540 unsigned int journal_inum = 0;
1541 unsigned long journal_devnum = 0;
1542 unsigned long def_mount_opts;
1543 struct inode *root;
1544 int blocksize;
1545 int hblock;
1546 int db_count;
1547 int i;
1548 int needs_recovery;
1549 __le32 features;
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001550 __u64 blocks_count;
Peter Zijlstra833f4072007-10-16 23:25:45 -07001551 int err;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001552
1553 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1554 if (!sbi)
1555 return -ENOMEM;
1556 sb->s_fs_info = sbi;
1557 sbi->s_mount_opt = 0;
Mingming Cao617ba132006-10-11 01:20:53 -07001558 sbi->s_resuid = EXT4_DEF_RESUID;
1559 sbi->s_resgid = EXT4_DEF_RESGID;
Miklos Szeredid9c9bef12007-10-16 23:26:27 -07001560 sbi->s_sb_block = sb_block;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001561
1562 unlock_kernel();
1563
Mingming Cao617ba132006-10-11 01:20:53 -07001564 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001565 if (!blocksize) {
Mingming Cao617ba132006-10-11 01:20:53 -07001566 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001567 goto out_fail;
1568 }
1569
1570 /*
Mingming Cao617ba132006-10-11 01:20:53 -07001571 * The ext4 superblock will not be buffer aligned for other than 1kB
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001572 * block sizes. We need to calculate the offset from buffer start.
1573 */
Mingming Cao617ba132006-10-11 01:20:53 -07001574 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
Andrew Morton70bbb3e2006-10-11 01:21:20 -07001575 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1576 offset = do_div(logical_sb_block, blocksize);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001577 } else {
Andrew Morton70bbb3e2006-10-11 01:21:20 -07001578 logical_sb_block = sb_block;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001579 }
1580
Andrew Morton70bbb3e2006-10-11 01:21:20 -07001581 if (!(bh = sb_bread(sb, logical_sb_block))) {
Mingming Cao617ba132006-10-11 01:20:53 -07001582 printk (KERN_ERR "EXT4-fs: unable to read superblock\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001583 goto out_fail;
1584 }
1585 /*
1586 * Note: s_es must be initialized as soon as possible because
Mingming Cao617ba132006-10-11 01:20:53 -07001587 * some ext4 macro-instructions depend on its value
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001588 */
Mingming Cao617ba132006-10-11 01:20:53 -07001589 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001590 sbi->s_es = es;
1591 sb->s_magic = le16_to_cpu(es->s_magic);
Mingming Cao617ba132006-10-11 01:20:53 -07001592 if (sb->s_magic != EXT4_SUPER_MAGIC)
1593 goto cantfind_ext4;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001594
1595 /* Set defaults before we parse the mount options */
1596 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
Mingming Cao617ba132006-10-11 01:20:53 -07001597 if (def_mount_opts & EXT4_DEFM_DEBUG)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001598 set_opt(sbi->s_mount_opt, DEBUG);
Mingming Cao617ba132006-10-11 01:20:53 -07001599 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001600 set_opt(sbi->s_mount_opt, GRPID);
Mingming Cao617ba132006-10-11 01:20:53 -07001601 if (def_mount_opts & EXT4_DEFM_UID16)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001602 set_opt(sbi->s_mount_opt, NO_UID32);
Hugh Dickins2e7842b2007-02-10 01:46:13 -08001603#ifdef CONFIG_EXT4DEV_FS_XATTR
Mingming Cao617ba132006-10-11 01:20:53 -07001604 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001605 set_opt(sbi->s_mount_opt, XATTR_USER);
Hugh Dickins2e7842b2007-02-10 01:46:13 -08001606#endif
1607#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
Mingming Cao617ba132006-10-11 01:20:53 -07001608 if (def_mount_opts & EXT4_DEFM_ACL)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001609 set_opt(sbi->s_mount_opt, POSIX_ACL);
Hugh Dickins2e7842b2007-02-10 01:46:13 -08001610#endif
Mingming Cao617ba132006-10-11 01:20:53 -07001611 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
1612 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
1613 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
1614 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
1615 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
1616 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001617
Mingming Cao617ba132006-10-11 01:20:53 -07001618 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001619 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
Mingming Cao617ba132006-10-11 01:20:53 -07001620 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_RO)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001621 set_opt(sbi->s_mount_opt, ERRORS_RO);
Dmitry Mishinceea16b2006-10-11 01:21:21 -07001622 else
1623 set_opt(sbi->s_mount_opt, ERRORS_CONT);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001624
1625 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1626 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1627
1628 set_opt(sbi->s_mount_opt, RESERVATION);
1629
Mingming Cao1e2462f2007-07-18 09:00:55 -04001630 /*
1631 * turn on extents feature by default in ext4 filesystem
1632 * User -o noextents to turn it off
1633 */
1634 set_opt(sbi->s_mount_opt, EXTENTS);
1635
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001636 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1637 NULL, 0))
1638 goto failed_mount;
1639
1640 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
Mingming Cao617ba132006-10-11 01:20:53 -07001641 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001642
Mingming Cao617ba132006-10-11 01:20:53 -07001643 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
1644 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
1645 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1646 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001647 printk(KERN_WARNING
Mingming Cao617ba132006-10-11 01:20:53 -07001648 "EXT4-fs warning: feature flags set on rev 0 fs, "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001649 "running e2fsck is recommended\n");
1650 /*
1651 * Check feature flags regardless of the revision level, since we
1652 * previously didn't change the revision level when setting the flags,
1653 * so there is a chance incompat flags are set on a rev 0 filesystem.
1654 */
Mingming Cao617ba132006-10-11 01:20:53 -07001655 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001656 if (features) {
Mingming Cao617ba132006-10-11 01:20:53 -07001657 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001658 "unsupported optional features (%x).\n",
1659 sb->s_id, le32_to_cpu(features));
1660 goto failed_mount;
1661 }
Mingming Cao617ba132006-10-11 01:20:53 -07001662 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001663 if (!(sb->s_flags & MS_RDONLY) && features) {
Mingming Cao617ba132006-10-11 01:20:53 -07001664 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001665 "unsupported optional features (%x).\n",
1666 sb->s_id, le32_to_cpu(features));
1667 goto failed_mount;
1668 }
1669 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1670
Mingming Cao617ba132006-10-11 01:20:53 -07001671 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
1672 blocksize > EXT4_MAX_BLOCK_SIZE) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001673 printk(KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001674 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001675 blocksize, sb->s_id);
1676 goto failed_mount;
1677 }
1678
1679 hblock = bdev_hardsect_size(sb->s_bdev);
1680 if (sb->s_blocksize != blocksize) {
1681 /*
1682 * Make sure the blocksize for the filesystem is larger
1683 * than the hardware sectorsize for the machine.
1684 */
1685 if (blocksize < hblock) {
Mingming Cao617ba132006-10-11 01:20:53 -07001686 printk(KERN_ERR "EXT4-fs: blocksize %d too small for "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001687 "device blocksize %d.\n", blocksize, hblock);
1688 goto failed_mount;
1689 }
1690
1691 brelse (bh);
1692 sb_set_blocksize(sb, blocksize);
Andrew Morton70bbb3e2006-10-11 01:21:20 -07001693 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1694 offset = do_div(logical_sb_block, blocksize);
1695 bh = sb_bread(sb, logical_sb_block);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001696 if (!bh) {
1697 printk(KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001698 "EXT4-fs: Can't read superblock on 2nd try.\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001699 goto failed_mount;
1700 }
Mingming Cao617ba132006-10-11 01:20:53 -07001701 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001702 sbi->s_es = es;
Mingming Cao617ba132006-10-11 01:20:53 -07001703 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001704 printk (KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001705 "EXT4-fs: Magic mismatch, very weird !\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001706 goto failed_mount;
1707 }
1708 }
1709
Mingming Cao617ba132006-10-11 01:20:53 -07001710 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001711
Mingming Cao617ba132006-10-11 01:20:53 -07001712 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
1713 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
1714 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001715 } else {
1716 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1717 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
Mingming Cao617ba132006-10-11 01:20:53 -07001718 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
Vignesh Babu13305932007-07-18 09:11:02 -04001719 (!is_power_of_2(sbi->s_inode_size)) ||
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001720 (sbi->s_inode_size > blocksize)) {
1721 printk (KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001722 "EXT4-fs: unsupported inode size: %d\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001723 sbi->s_inode_size);
1724 goto failed_mount;
1725 }
Kalpak Shahef7f3832007-07-18 09:15:20 -04001726 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
1727 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001728 }
Mingming Cao617ba132006-10-11 01:20:53 -07001729 sbi->s_frag_size = EXT4_MIN_FRAG_SIZE <<
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001730 le32_to_cpu(es->s_log_frag_size);
1731 if (blocksize != sbi->s_frag_size) {
1732 printk(KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001733 "EXT4-fs: fragsize %lu != blocksize %u (unsupported)\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001734 sbi->s_frag_size, blocksize);
1735 goto failed_mount;
1736 }
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07001737 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
1738 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07001739 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07001740 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
1741 sbi->s_desc_size & (sbi->s_desc_size - 1)) {
1742 printk(KERN_ERR
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07001743 "EXT4-fs: unsupported descriptor size %lu\n",
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07001744 sbi->s_desc_size);
1745 goto failed_mount;
1746 }
1747 } else
1748 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001749 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1750 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1751 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
Mingming Cao617ba132006-10-11 01:20:53 -07001752 if (EXT4_INODE_SIZE(sb) == 0)
1753 goto cantfind_ext4;
1754 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001755 if (sbi->s_inodes_per_block == 0)
Mingming Cao617ba132006-10-11 01:20:53 -07001756 goto cantfind_ext4;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001757 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1758 sbi->s_inodes_per_block;
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07001759 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001760 sbi->s_sbh = bh;
1761 sbi->s_mount_state = le16_to_cpu(es->s_state);
Fengguang Wue57aa832007-10-16 23:26:25 -07001762 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
1763 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001764 for (i=0; i < 4; i++)
1765 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1766 sbi->s_def_hash_version = es->s_def_hash_version;
1767
1768 if (sbi->s_blocks_per_group > blocksize * 8) {
1769 printk (KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001770 "EXT4-fs: #blocks per group too big: %lu\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001771 sbi->s_blocks_per_group);
1772 goto failed_mount;
1773 }
1774 if (sbi->s_frags_per_group > blocksize * 8) {
1775 printk (KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001776 "EXT4-fs: #fragments per group too big: %lu\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001777 sbi->s_frags_per_group);
1778 goto failed_mount;
1779 }
1780 if (sbi->s_inodes_per_group > blocksize * 8) {
1781 printk (KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001782 "EXT4-fs: #inodes per group too big: %lu\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001783 sbi->s_inodes_per_group);
1784 goto failed_mount;
1785 }
1786
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001787 if (ext4_blocks_count(es) >
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001788 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
Mingming Cao617ba132006-10-11 01:20:53 -07001789 printk(KERN_ERR "EXT4-fs: filesystem on %s:"
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001790 " too large to mount safely\n", sb->s_id);
1791 if (sizeof(sector_t) < 8)
Mingming Cao617ba132006-10-11 01:20:53 -07001792 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001793 "enabled\n");
1794 goto failed_mount;
1795 }
1796
Mingming Cao617ba132006-10-11 01:20:53 -07001797 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
1798 goto cantfind_ext4;
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001799 blocks_count = (ext4_blocks_count(es) -
1800 le32_to_cpu(es->s_first_data_block) +
1801 EXT4_BLOCKS_PER_GROUP(sb) - 1);
1802 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
1803 sbi->s_groups_count = blocks_count;
Mingming Cao617ba132006-10-11 01:20:53 -07001804 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
1805 EXT4_DESC_PER_BLOCK(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001806 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1807 GFP_KERNEL);
1808 if (sbi->s_group_desc == NULL) {
Mingming Cao617ba132006-10-11 01:20:53 -07001809 printk (KERN_ERR "EXT4-fs: not enough memory\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001810 goto failed_mount;
1811 }
1812
1813 bgl_lock_init(&sbi->s_blockgroup_lock);
1814
1815 for (i = 0; i < db_count; i++) {
Andrew Morton70bbb3e2006-10-11 01:21:20 -07001816 block = descriptor_loc(sb, logical_sb_block, i);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001817 sbi->s_group_desc[i] = sb_bread(sb, block);
1818 if (!sbi->s_group_desc[i]) {
Mingming Cao617ba132006-10-11 01:20:53 -07001819 printk (KERN_ERR "EXT4-fs: "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001820 "can't read group descriptor %d\n", i);
1821 db_count = i;
1822 goto failed_mount2;
1823 }
1824 }
Mingming Cao617ba132006-10-11 01:20:53 -07001825 if (!ext4_check_descriptors (sb)) {
1826 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001827 goto failed_mount2;
1828 }
1829 sbi->s_gdb_count = db_count;
1830 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1831 spin_lock_init(&sbi->s_next_gen_lock);
1832
Peter Zijlstra833f4072007-10-16 23:25:45 -07001833 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1834 ext4_count_free_blocks(sb));
1835 if (!err) {
1836 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1837 ext4_count_free_inodes(sb));
1838 }
1839 if (!err) {
1840 err = percpu_counter_init(&sbi->s_dirs_counter,
1841 ext4_count_dirs(sb));
1842 }
1843 if (err) {
1844 printk(KERN_ERR "EXT4-fs: insufficient memory\n");
1845 goto failed_mount3;
1846 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001847
1848 /* per fileystem reservation list head & lock */
1849 spin_lock_init(&sbi->s_rsv_window_lock);
1850 sbi->s_rsv_window_root = RB_ROOT;
1851 /* Add a single, static dummy reservation to the start of the
1852 * reservation window list --- it gives us a placeholder for
1853 * append-at-start-of-list which makes the allocation logic
1854 * _much_ simpler. */
Mingming Cao617ba132006-10-11 01:20:53 -07001855 sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
1856 sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001857 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1858 sbi->s_rsv_window_head.rsv_goal_size = 0;
Mingming Cao617ba132006-10-11 01:20:53 -07001859 ext4_rsv_window_add(sb, &sbi->s_rsv_window_head);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001860
1861 /*
1862 * set up enough so that it can read an inode
1863 */
Mingming Cao617ba132006-10-11 01:20:53 -07001864 sb->s_op = &ext4_sops;
1865 sb->s_export_op = &ext4_export_ops;
1866 sb->s_xattr = ext4_xattr_handlers;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001867#ifdef CONFIG_QUOTA
Mingming Cao617ba132006-10-11 01:20:53 -07001868 sb->s_qcop = &ext4_qctl_operations;
1869 sb->dq_op = &ext4_quota_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001870#endif
1871 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1872
1873 sb->s_root = NULL;
1874
1875 needs_recovery = (es->s_last_orphan != 0 ||
Mingming Cao617ba132006-10-11 01:20:53 -07001876 EXT4_HAS_INCOMPAT_FEATURE(sb,
1877 EXT4_FEATURE_INCOMPAT_RECOVER));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001878
1879 /*
1880 * The first inode we look at is the journal inode. Don't try
1881 * root first: it may be modified in the journal!
1882 */
1883 if (!test_opt(sb, NOLOAD) &&
Mingming Cao617ba132006-10-11 01:20:53 -07001884 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
1885 if (ext4_load_journal(sb, es, journal_devnum))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001886 goto failed_mount3;
1887 } else if (journal_inum) {
Mingming Cao617ba132006-10-11 01:20:53 -07001888 if (ext4_create_journal(sb, es, journal_inum))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001889 goto failed_mount3;
1890 } else {
1891 if (!silent)
1892 printk (KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001893 "ext4: No journal on filesystem on %s\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001894 sb->s_id);
1895 goto failed_mount3;
1896 }
1897
Jose R. Santoseb40a092007-07-18 08:37:25 -04001898 if (ext4_blocks_count(es) > 0xffffffffULL &&
1899 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
1900 JBD2_FEATURE_INCOMPAT_64BIT)) {
1901 printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n");
1902 goto failed_mount4;
1903 }
1904
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001905 /* We have now updated the journal if required, so we can
1906 * validate the data journaling mode. */
1907 switch (test_opt(sb, DATA_FLAGS)) {
1908 case 0:
1909 /* No mode set, assume a default based on the journal
Andrew Morton63f57932006-10-11 01:21:24 -07001910 * capabilities: ORDERED_DATA if the journal can
1911 * cope, else JOURNAL_DATA
1912 */
Mingming Caodab291a2006-10-11 01:21:01 -07001913 if (jbd2_journal_check_available_features
1914 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001915 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1916 else
1917 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1918 break;
1919
Mingming Cao617ba132006-10-11 01:20:53 -07001920 case EXT4_MOUNT_ORDERED_DATA:
1921 case EXT4_MOUNT_WRITEBACK_DATA:
Mingming Caodab291a2006-10-11 01:21:01 -07001922 if (!jbd2_journal_check_available_features
1923 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
Mingming Cao617ba132006-10-11 01:20:53 -07001924 printk(KERN_ERR "EXT4-fs: Journal does not support "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001925 "requested data journaling mode\n");
1926 goto failed_mount4;
1927 }
1928 default:
1929 break;
1930 }
1931
1932 if (test_opt(sb, NOBH)) {
Mingming Cao617ba132006-10-11 01:20:53 -07001933 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
1934 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001935 "its supported only with writeback mode\n");
1936 clear_opt(sbi->s_mount_opt, NOBH);
1937 }
1938 }
1939 /*
Mingming Caodab291a2006-10-11 01:21:01 -07001940 * The jbd2_journal_load will have done any necessary log recovery,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001941 * so we can safely mount the rest of the filesystem now.
1942 */
1943
Mingming Cao617ba132006-10-11 01:20:53 -07001944 root = iget(sb, EXT4_ROOT_INO);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001945 sb->s_root = d_alloc_root(root);
1946 if (!sb->s_root) {
Mingming Cao617ba132006-10-11 01:20:53 -07001947 printk(KERN_ERR "EXT4-fs: get root inode failed\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001948 iput(root);
1949 goto failed_mount4;
1950 }
1951 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1952 dput(sb->s_root);
1953 sb->s_root = NULL;
Mingming Cao617ba132006-10-11 01:20:53 -07001954 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001955 goto failed_mount4;
1956 }
1957
Mingming Cao617ba132006-10-11 01:20:53 -07001958 ext4_setup_super (sb, es, sb->s_flags & MS_RDONLY);
Kalpak Shahef7f3832007-07-18 09:15:20 -04001959
1960 /* determine the minimum size of new large inodes, if present */
1961 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
1962 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
1963 EXT4_GOOD_OLD_INODE_SIZE;
1964 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
1965 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
1966 if (sbi->s_want_extra_isize <
1967 le16_to_cpu(es->s_want_extra_isize))
1968 sbi->s_want_extra_isize =
1969 le16_to_cpu(es->s_want_extra_isize);
1970 if (sbi->s_want_extra_isize <
1971 le16_to_cpu(es->s_min_extra_isize))
1972 sbi->s_want_extra_isize =
1973 le16_to_cpu(es->s_min_extra_isize);
1974 }
1975 }
1976 /* Check if enough inode space is available */
1977 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
1978 sbi->s_inode_size) {
1979 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
1980 EXT4_GOOD_OLD_INODE_SIZE;
1981 printk(KERN_INFO "EXT4-fs: required extra inode space not"
1982 "available.\n");
1983 }
1984
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001985 /*
1986 * akpm: core read_super() calls in here with the superblock locked.
1987 * That deadlocks, because orphan cleanup needs to lock the superblock
1988 * in numerous places. Here we just pop the lock - it's relatively
1989 * harmless, because we are now ready to accept write_super() requests,
1990 * and aviro says that's the only reason for hanging onto the
1991 * superblock lock.
1992 */
Mingming Cao617ba132006-10-11 01:20:53 -07001993 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
1994 ext4_orphan_cleanup(sb, es);
1995 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001996 if (needs_recovery)
Mingming Cao617ba132006-10-11 01:20:53 -07001997 printk (KERN_INFO "EXT4-fs: recovery complete.\n");
1998 ext4_mark_recovery_complete(sb, es);
1999 printk (KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n",
2000 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal":
2001 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered":
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002002 "writeback");
2003
Alex Tomasa86c6182006-10-11 01:21:03 -07002004 ext4_ext_init(sb);
2005
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002006 lock_kernel();
2007 return 0;
2008
Mingming Cao617ba132006-10-11 01:20:53 -07002009cantfind_ext4:
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002010 if (!silent)
Mingming Cao617ba132006-10-11 01:20:53 -07002011 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002012 sb->s_id);
2013 goto failed_mount;
2014
2015failed_mount4:
Mingming Caodab291a2006-10-11 01:21:01 -07002016 jbd2_journal_destroy(sbi->s_journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002017failed_mount3:
2018 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2019 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2020 percpu_counter_destroy(&sbi->s_dirs_counter);
2021failed_mount2:
2022 for (i = 0; i < db_count; i++)
2023 brelse(sbi->s_group_desc[i]);
2024 kfree(sbi->s_group_desc);
2025failed_mount:
2026#ifdef CONFIG_QUOTA
2027 for (i = 0; i < MAXQUOTAS; i++)
2028 kfree(sbi->s_qf_names[i]);
2029#endif
Mingming Cao617ba132006-10-11 01:20:53 -07002030 ext4_blkdev_remove(sbi);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002031 brelse(bh);
2032out_fail:
2033 sb->s_fs_info = NULL;
2034 kfree(sbi);
2035 lock_kernel();
2036 return -EINVAL;
2037}
2038
2039/*
2040 * Setup any per-fs journal parameters now. We'll do this both on
2041 * initial mount, once the journal has been initialised but before we've
2042 * done any recovery; and again on any subsequent remount.
2043 */
Mingming Cao617ba132006-10-11 01:20:53 -07002044static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002045{
Mingming Cao617ba132006-10-11 01:20:53 -07002046 struct ext4_sb_info *sbi = EXT4_SB(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002047
2048 if (sbi->s_commit_interval)
2049 journal->j_commit_interval = sbi->s_commit_interval;
Mingming Cao617ba132006-10-11 01:20:53 -07002050 /* We could also set up an ext4-specific default for the commit
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002051 * interval here, but for now we'll just fall back to the jbd
2052 * default. */
2053
2054 spin_lock(&journal->j_state_lock);
2055 if (test_opt(sb, BARRIER))
Mingming Caodab291a2006-10-11 01:21:01 -07002056 journal->j_flags |= JBD2_BARRIER;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002057 else
Mingming Caodab291a2006-10-11 01:21:01 -07002058 journal->j_flags &= ~JBD2_BARRIER;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002059 spin_unlock(&journal->j_state_lock);
2060}
2061
Mingming Cao617ba132006-10-11 01:20:53 -07002062static journal_t *ext4_get_journal(struct super_block *sb,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002063 unsigned int journal_inum)
2064{
2065 struct inode *journal_inode;
2066 journal_t *journal;
2067
2068 /* First, test for the existence of a valid inode on disk. Bad
2069 * things happen if we iget() an unused inode, as the subsequent
2070 * iput() will try to delete it. */
2071
2072 journal_inode = iget(sb, journal_inum);
2073 if (!journal_inode) {
Mingming Cao617ba132006-10-11 01:20:53 -07002074 printk(KERN_ERR "EXT4-fs: no journal found.\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002075 return NULL;
2076 }
2077 if (!journal_inode->i_nlink) {
2078 make_bad_inode(journal_inode);
2079 iput(journal_inode);
Mingming Cao617ba132006-10-11 01:20:53 -07002080 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002081 return NULL;
2082 }
2083
2084 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2085 journal_inode, journal_inode->i_size);
2086 if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
Mingming Cao617ba132006-10-11 01:20:53 -07002087 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002088 iput(journal_inode);
2089 return NULL;
2090 }
2091
Mingming Caodab291a2006-10-11 01:21:01 -07002092 journal = jbd2_journal_init_inode(journal_inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002093 if (!journal) {
Mingming Cao617ba132006-10-11 01:20:53 -07002094 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002095 iput(journal_inode);
2096 return NULL;
2097 }
2098 journal->j_private = sb;
Mingming Cao617ba132006-10-11 01:20:53 -07002099 ext4_init_journal_params(sb, journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002100 return journal;
2101}
2102
Mingming Cao617ba132006-10-11 01:20:53 -07002103static journal_t *ext4_get_dev_journal(struct super_block *sb,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002104 dev_t j_dev)
2105{
2106 struct buffer_head * bh;
2107 journal_t *journal;
Mingming Cao617ba132006-10-11 01:20:53 -07002108 ext4_fsblk_t start;
2109 ext4_fsblk_t len;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002110 int hblock, blocksize;
Mingming Cao617ba132006-10-11 01:20:53 -07002111 ext4_fsblk_t sb_block;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002112 unsigned long offset;
Mingming Cao617ba132006-10-11 01:20:53 -07002113 struct ext4_super_block * es;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002114 struct block_device *bdev;
2115
Mingming Cao617ba132006-10-11 01:20:53 -07002116 bdev = ext4_blkdev_get(j_dev);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002117 if (bdev == NULL)
2118 return NULL;
2119
2120 if (bd_claim(bdev, sb)) {
2121 printk(KERN_ERR
Dave Kleikamp8c55e202007-05-24 13:04:54 -04002122 "EXT4: failed to claim external journal device.\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002123 blkdev_put(bdev);
2124 return NULL;
2125 }
2126
2127 blocksize = sb->s_blocksize;
2128 hblock = bdev_hardsect_size(bdev);
2129 if (blocksize < hblock) {
2130 printk(KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07002131 "EXT4-fs: blocksize too small for journal device.\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002132 goto out_bdev;
2133 }
2134
Mingming Cao617ba132006-10-11 01:20:53 -07002135 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
2136 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002137 set_blocksize(bdev, blocksize);
2138 if (!(bh = __bread(bdev, sb_block, blocksize))) {
Mingming Cao617ba132006-10-11 01:20:53 -07002139 printk(KERN_ERR "EXT4-fs: couldn't read superblock of "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002140 "external journal\n");
2141 goto out_bdev;
2142 }
2143
Mingming Cao617ba132006-10-11 01:20:53 -07002144 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2145 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002146 !(le32_to_cpu(es->s_feature_incompat) &
Mingming Cao617ba132006-10-11 01:20:53 -07002147 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2148 printk(KERN_ERR "EXT4-fs: external journal has "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002149 "bad superblock\n");
2150 brelse(bh);
2151 goto out_bdev;
2152 }
2153
Mingming Cao617ba132006-10-11 01:20:53 -07002154 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2155 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002156 brelse(bh);
2157 goto out_bdev;
2158 }
2159
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002160 len = ext4_blocks_count(es);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002161 start = sb_block + 1;
2162 brelse(bh); /* we're done with the superblock */
2163
Mingming Caodab291a2006-10-11 01:21:01 -07002164 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002165 start, len, blocksize);
2166 if (!journal) {
Mingming Cao617ba132006-10-11 01:20:53 -07002167 printk(KERN_ERR "EXT4-fs: failed to create device journal\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002168 goto out_bdev;
2169 }
2170 journal->j_private = sb;
2171 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2172 wait_on_buffer(journal->j_sb_buffer);
2173 if (!buffer_uptodate(journal->j_sb_buffer)) {
Mingming Cao617ba132006-10-11 01:20:53 -07002174 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002175 goto out_journal;
2176 }
2177 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
Mingming Cao617ba132006-10-11 01:20:53 -07002178 printk(KERN_ERR "EXT4-fs: External journal has more than one "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002179 "user (unsupported) - %d\n",
2180 be32_to_cpu(journal->j_superblock->s_nr_users));
2181 goto out_journal;
2182 }
Mingming Cao617ba132006-10-11 01:20:53 -07002183 EXT4_SB(sb)->journal_bdev = bdev;
2184 ext4_init_journal_params(sb, journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002185 return journal;
2186out_journal:
Mingming Caodab291a2006-10-11 01:21:01 -07002187 jbd2_journal_destroy(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002188out_bdev:
Mingming Cao617ba132006-10-11 01:20:53 -07002189 ext4_blkdev_put(bdev);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002190 return NULL;
2191}
2192
Mingming Cao617ba132006-10-11 01:20:53 -07002193static int ext4_load_journal(struct super_block *sb,
2194 struct ext4_super_block *es,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002195 unsigned long journal_devnum)
2196{
2197 journal_t *journal;
2198 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2199 dev_t journal_dev;
2200 int err = 0;
2201 int really_read_only;
2202
2203 if (journal_devnum &&
2204 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
Mingming Cao617ba132006-10-11 01:20:53 -07002205 printk(KERN_INFO "EXT4-fs: external journal device major/minor "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002206 "numbers have changed\n");
2207 journal_dev = new_decode_dev(journal_devnum);
2208 } else
2209 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2210
2211 really_read_only = bdev_read_only(sb->s_bdev);
2212
2213 /*
2214 * Are we loading a blank journal or performing recovery after a
2215 * crash? For recovery, we need to check in advance whether we
2216 * can get read-write access to the device.
2217 */
2218
Mingming Cao617ba132006-10-11 01:20:53 -07002219 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002220 if (sb->s_flags & MS_RDONLY) {
Mingming Cao617ba132006-10-11 01:20:53 -07002221 printk(KERN_INFO "EXT4-fs: INFO: recovery "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002222 "required on readonly filesystem.\n");
2223 if (really_read_only) {
Mingming Cao617ba132006-10-11 01:20:53 -07002224 printk(KERN_ERR "EXT4-fs: write access "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002225 "unavailable, cannot proceed.\n");
2226 return -EROFS;
2227 }
Mingming Cao617ba132006-10-11 01:20:53 -07002228 printk (KERN_INFO "EXT4-fs: write access will "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002229 "be enabled during recovery.\n");
2230 }
2231 }
2232
2233 if (journal_inum && journal_dev) {
Mingming Cao617ba132006-10-11 01:20:53 -07002234 printk(KERN_ERR "EXT4-fs: filesystem has both journal "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002235 "and inode journals!\n");
2236 return -EINVAL;
2237 }
2238
2239 if (journal_inum) {
Mingming Cao617ba132006-10-11 01:20:53 -07002240 if (!(journal = ext4_get_journal(sb, journal_inum)))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002241 return -EINVAL;
2242 } else {
Mingming Cao617ba132006-10-11 01:20:53 -07002243 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002244 return -EINVAL;
2245 }
2246
2247 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
Mingming Caodab291a2006-10-11 01:21:01 -07002248 err = jbd2_journal_update_format(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002249 if (err) {
Mingming Cao617ba132006-10-11 01:20:53 -07002250 printk(KERN_ERR "EXT4-fs: error updating journal.\n");
Mingming Caodab291a2006-10-11 01:21:01 -07002251 jbd2_journal_destroy(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002252 return err;
2253 }
2254 }
2255
Mingming Cao617ba132006-10-11 01:20:53 -07002256 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
Mingming Caodab291a2006-10-11 01:21:01 -07002257 err = jbd2_journal_wipe(journal, !really_read_only);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002258 if (!err)
Mingming Caodab291a2006-10-11 01:21:01 -07002259 err = jbd2_journal_load(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002260
2261 if (err) {
Mingming Cao617ba132006-10-11 01:20:53 -07002262 printk(KERN_ERR "EXT4-fs: error loading journal.\n");
Mingming Caodab291a2006-10-11 01:21:01 -07002263 jbd2_journal_destroy(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002264 return err;
2265 }
2266
Mingming Cao617ba132006-10-11 01:20:53 -07002267 EXT4_SB(sb)->s_journal = journal;
2268 ext4_clear_journal_err(sb, es);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002269
2270 if (journal_devnum &&
2271 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2272 es->s_journal_dev = cpu_to_le32(journal_devnum);
2273 sb->s_dirt = 1;
2274
2275 /* Make sure we flush the recovery flag to disk. */
Mingming Cao617ba132006-10-11 01:20:53 -07002276 ext4_commit_super(sb, es, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002277 }
2278
2279 return 0;
2280}
2281
Mingming Cao617ba132006-10-11 01:20:53 -07002282static int ext4_create_journal(struct super_block * sb,
2283 struct ext4_super_block * es,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002284 unsigned int journal_inum)
2285{
2286 journal_t *journal;
Borislav Petkov6c675bd2007-07-15 23:41:45 -07002287 int err;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002288
2289 if (sb->s_flags & MS_RDONLY) {
Mingming Cao617ba132006-10-11 01:20:53 -07002290 printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002291 "create journal.\n");
2292 return -EROFS;
2293 }
2294
Borislav Petkov6c675bd2007-07-15 23:41:45 -07002295 journal = ext4_get_journal(sb, journal_inum);
2296 if (!journal)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002297 return -EINVAL;
2298
Mingming Cao617ba132006-10-11 01:20:53 -07002299 printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002300 journal_inum);
2301
Borislav Petkov6c675bd2007-07-15 23:41:45 -07002302 err = jbd2_journal_create(journal);
2303 if (err) {
Mingming Cao617ba132006-10-11 01:20:53 -07002304 printk(KERN_ERR "EXT4-fs: error creating journal.\n");
Mingming Caodab291a2006-10-11 01:21:01 -07002305 jbd2_journal_destroy(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002306 return -EIO;
2307 }
2308
Mingming Cao617ba132006-10-11 01:20:53 -07002309 EXT4_SB(sb)->s_journal = journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002310
Mingming Cao617ba132006-10-11 01:20:53 -07002311 ext4_update_dynamic_rev(sb);
2312 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2313 EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002314
2315 es->s_journal_inum = cpu_to_le32(journal_inum);
2316 sb->s_dirt = 1;
2317
2318 /* Make sure we flush the recovery flag to disk. */
Mingming Cao617ba132006-10-11 01:20:53 -07002319 ext4_commit_super(sb, es, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002320
2321 return 0;
2322}
2323
Mingming Cao617ba132006-10-11 01:20:53 -07002324static void ext4_commit_super (struct super_block * sb,
2325 struct ext4_super_block * es,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002326 int sync)
2327{
Mingming Cao617ba132006-10-11 01:20:53 -07002328 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002329
2330 if (!sbh)
2331 return;
2332 es->s_wtime = cpu_to_le32(get_seconds());
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002333 ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb));
Mingming Cao617ba132006-10-11 01:20:53 -07002334 es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002335 BUFFER_TRACE(sbh, "marking dirty");
2336 mark_buffer_dirty(sbh);
2337 if (sync)
2338 sync_dirty_buffer(sbh);
2339}
2340
2341
2342/*
2343 * Have we just finished recovery? If so, and if we are mounting (or
2344 * remounting) the filesystem readonly, then we will end up with a
2345 * consistent fs on disk. Record that fact.
2346 */
Mingming Cao617ba132006-10-11 01:20:53 -07002347static void ext4_mark_recovery_complete(struct super_block * sb,
2348 struct ext4_super_block * es)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002349{
Mingming Cao617ba132006-10-11 01:20:53 -07002350 journal_t *journal = EXT4_SB(sb)->s_journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002351
Mingming Caodab291a2006-10-11 01:21:01 -07002352 jbd2_journal_lock_updates(journal);
2353 jbd2_journal_flush(journal);
Jan Kara32c37732007-07-15 23:41:09 -07002354 lock_super(sb);
Mingming Cao617ba132006-10-11 01:20:53 -07002355 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002356 sb->s_flags & MS_RDONLY) {
Mingming Cao617ba132006-10-11 01:20:53 -07002357 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002358 sb->s_dirt = 0;
Mingming Cao617ba132006-10-11 01:20:53 -07002359 ext4_commit_super(sb, es, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002360 }
Jan Kara32c37732007-07-15 23:41:09 -07002361 unlock_super(sb);
Mingming Caodab291a2006-10-11 01:21:01 -07002362 jbd2_journal_unlock_updates(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002363}
2364
2365/*
2366 * If we are mounting (or read-write remounting) a filesystem whose journal
2367 * has recorded an error from a previous lifetime, move that error to the
2368 * main filesystem now.
2369 */
Mingming Cao617ba132006-10-11 01:20:53 -07002370static void ext4_clear_journal_err(struct super_block * sb,
2371 struct ext4_super_block * es)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002372{
2373 journal_t *journal;
2374 int j_errno;
2375 const char *errstr;
2376
Mingming Cao617ba132006-10-11 01:20:53 -07002377 journal = EXT4_SB(sb)->s_journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002378
2379 /*
2380 * Now check for any error status which may have been recorded in the
Mingming Cao617ba132006-10-11 01:20:53 -07002381 * journal by a prior ext4_error() or ext4_abort()
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002382 */
2383
Mingming Caodab291a2006-10-11 01:21:01 -07002384 j_errno = jbd2_journal_errno(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002385 if (j_errno) {
2386 char nbuf[16];
2387
Mingming Cao617ba132006-10-11 01:20:53 -07002388 errstr = ext4_decode_error(sb, j_errno, nbuf);
2389 ext4_warning(sb, __FUNCTION__, "Filesystem error recorded "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002390 "from previous mount: %s", errstr);
Mingming Cao617ba132006-10-11 01:20:53 -07002391 ext4_warning(sb, __FUNCTION__, "Marking fs in need of "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002392 "filesystem check.");
2393
Mingming Cao617ba132006-10-11 01:20:53 -07002394 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2395 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2396 ext4_commit_super (sb, es, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002397
Mingming Caodab291a2006-10-11 01:21:01 -07002398 jbd2_journal_clear_err(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002399 }
2400}
2401
2402/*
2403 * Force the running and committing transactions to commit,
2404 * and wait on the commit.
2405 */
Mingming Cao617ba132006-10-11 01:20:53 -07002406int ext4_force_commit(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002407{
2408 journal_t *journal;
2409 int ret;
2410
2411 if (sb->s_flags & MS_RDONLY)
2412 return 0;
2413
Mingming Cao617ba132006-10-11 01:20:53 -07002414 journal = EXT4_SB(sb)->s_journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002415 sb->s_dirt = 0;
Mingming Cao617ba132006-10-11 01:20:53 -07002416 ret = ext4_journal_force_commit(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002417 return ret;
2418}
2419
2420/*
Mingming Cao617ba132006-10-11 01:20:53 -07002421 * Ext4 always journals updates to the superblock itself, so we don't
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002422 * have to propagate any other updates to the superblock on disk at this
2423 * point. Just start an async writeback to get the buffers on their way
2424 * to the disk.
2425 *
2426 * This implicitly triggers the writebehind on sync().
2427 */
2428
Mingming Cao617ba132006-10-11 01:20:53 -07002429static void ext4_write_super (struct super_block * sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002430{
2431 if (mutex_trylock(&sb->s_lock) != 0)
2432 BUG();
2433 sb->s_dirt = 0;
2434}
2435
Mingming Cao617ba132006-10-11 01:20:53 -07002436static int ext4_sync_fs(struct super_block *sb, int wait)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002437{
2438 tid_t target;
2439
2440 sb->s_dirt = 0;
Mingming Caodab291a2006-10-11 01:21:01 -07002441 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002442 if (wait)
Mingming Caodab291a2006-10-11 01:21:01 -07002443 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002444 }
2445 return 0;
2446}
2447
2448/*
2449 * LVM calls this function before a (read-only) snapshot is created. This
2450 * gives us a chance to flush the journal completely and mark the fs clean.
2451 */
Mingming Cao617ba132006-10-11 01:20:53 -07002452static void ext4_write_super_lockfs(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002453{
2454 sb->s_dirt = 0;
2455
2456 if (!(sb->s_flags & MS_RDONLY)) {
Mingming Cao617ba132006-10-11 01:20:53 -07002457 journal_t *journal = EXT4_SB(sb)->s_journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002458
2459 /* Now we set up the journal barrier. */
Mingming Caodab291a2006-10-11 01:21:01 -07002460 jbd2_journal_lock_updates(journal);
2461 jbd2_journal_flush(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002462
2463 /* Journal blocked and flushed, clear needs_recovery flag. */
Mingming Cao617ba132006-10-11 01:20:53 -07002464 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2465 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002466 }
2467}
2468
2469/*
2470 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2471 * flag here, even though the filesystem is not technically dirty yet.
2472 */
Mingming Cao617ba132006-10-11 01:20:53 -07002473static void ext4_unlockfs(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002474{
2475 if (!(sb->s_flags & MS_RDONLY)) {
2476 lock_super(sb);
2477 /* Reser the needs_recovery flag before the fs is unlocked. */
Mingming Cao617ba132006-10-11 01:20:53 -07002478 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2479 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002480 unlock_super(sb);
Mingming Caodab291a2006-10-11 01:21:01 -07002481 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002482 }
2483}
2484
Mingming Cao617ba132006-10-11 01:20:53 -07002485static int ext4_remount (struct super_block * sb, int * flags, char * data)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002486{
Mingming Cao617ba132006-10-11 01:20:53 -07002487 struct ext4_super_block * es;
2488 struct ext4_sb_info *sbi = EXT4_SB(sb);
2489 ext4_fsblk_t n_blocks_count = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002490 unsigned long old_sb_flags;
Mingming Cao617ba132006-10-11 01:20:53 -07002491 struct ext4_mount_options old_opts;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002492 int err;
2493#ifdef CONFIG_QUOTA
2494 int i;
2495#endif
2496
2497 /* Store the original options */
2498 old_sb_flags = sb->s_flags;
2499 old_opts.s_mount_opt = sbi->s_mount_opt;
2500 old_opts.s_resuid = sbi->s_resuid;
2501 old_opts.s_resgid = sbi->s_resgid;
2502 old_opts.s_commit_interval = sbi->s_commit_interval;
2503#ifdef CONFIG_QUOTA
2504 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2505 for (i = 0; i < MAXQUOTAS; i++)
2506 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2507#endif
2508
2509 /*
2510 * Allow the "check" option to be passed as a remount option.
2511 */
2512 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2513 err = -EINVAL;
2514 goto restore_opts;
2515 }
2516
Mingming Cao617ba132006-10-11 01:20:53 -07002517 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT)
2518 ext4_abort(sb, __FUNCTION__, "Abort forced by user");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002519
2520 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
Mingming Cao617ba132006-10-11 01:20:53 -07002521 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002522
2523 es = sbi->s_es;
2524
Mingming Cao617ba132006-10-11 01:20:53 -07002525 ext4_init_journal_params(sb, sbi->s_journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002526
2527 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002528 n_blocks_count > ext4_blocks_count(es)) {
Mingming Cao617ba132006-10-11 01:20:53 -07002529 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002530 err = -EROFS;
2531 goto restore_opts;
2532 }
2533
2534 if (*flags & MS_RDONLY) {
2535 /*
2536 * First of all, the unconditional stuff we have to do
2537 * to disable replay of the journal when we next remount
2538 */
2539 sb->s_flags |= MS_RDONLY;
2540
2541 /*
2542 * OK, test if we are remounting a valid rw partition
2543 * readonly, and if so set the rdonly flag and then
2544 * mark the partition as valid again.
2545 */
Mingming Cao617ba132006-10-11 01:20:53 -07002546 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
2547 (sbi->s_mount_state & EXT4_VALID_FS))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002548 es->s_state = cpu_to_le16(sbi->s_mount_state);
2549
Jan Kara32c37732007-07-15 23:41:09 -07002550 /*
2551 * We have to unlock super so that we can wait for
2552 * transactions.
2553 */
2554 unlock_super(sb);
Mingming Cao617ba132006-10-11 01:20:53 -07002555 ext4_mark_recovery_complete(sb, es);
Jan Kara32c37732007-07-15 23:41:09 -07002556 lock_super(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002557 } else {
2558 __le32 ret;
Mingming Cao617ba132006-10-11 01:20:53 -07002559 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
2560 ~EXT4_FEATURE_RO_COMPAT_SUPP))) {
2561 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002562 "remount RDWR because of unsupported "
2563 "optional features (%x).\n",
2564 sb->s_id, le32_to_cpu(ret));
2565 err = -EROFS;
2566 goto restore_opts;
2567 }
Eric Sandeenead65962007-02-10 01:46:08 -08002568
2569 /*
2570 * If we have an unprocessed orphan list hanging
2571 * around from a previously readonly bdev mount,
2572 * require a full umount/remount for now.
2573 */
2574 if (es->s_last_orphan) {
2575 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
2576 "remount RDWR because of unprocessed "
2577 "orphan inode list. Please "
2578 "umount/remount instead.\n",
2579 sb->s_id);
2580 err = -EINVAL;
2581 goto restore_opts;
2582 }
2583
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002584 /*
2585 * Mounting a RDONLY partition read-write, so reread
2586 * and store the current valid flag. (It may have
2587 * been changed by e2fsck since we originally mounted
2588 * the partition.)
2589 */
Mingming Cao617ba132006-10-11 01:20:53 -07002590 ext4_clear_journal_err(sb, es);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002591 sbi->s_mount_state = le16_to_cpu(es->s_state);
Mingming Cao617ba132006-10-11 01:20:53 -07002592 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002593 goto restore_opts;
Mingming Cao617ba132006-10-11 01:20:53 -07002594 if (!ext4_setup_super (sb, es, 0))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002595 sb->s_flags &= ~MS_RDONLY;
2596 }
2597 }
2598#ifdef CONFIG_QUOTA
2599 /* Release old quota file names */
2600 for (i = 0; i < MAXQUOTAS; i++)
2601 if (old_opts.s_qf_names[i] &&
2602 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2603 kfree(old_opts.s_qf_names[i]);
2604#endif
2605 return 0;
2606restore_opts:
2607 sb->s_flags = old_sb_flags;
2608 sbi->s_mount_opt = old_opts.s_mount_opt;
2609 sbi->s_resuid = old_opts.s_resuid;
2610 sbi->s_resgid = old_opts.s_resgid;
2611 sbi->s_commit_interval = old_opts.s_commit_interval;
2612#ifdef CONFIG_QUOTA
2613 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2614 for (i = 0; i < MAXQUOTAS; i++) {
2615 if (sbi->s_qf_names[i] &&
2616 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2617 kfree(sbi->s_qf_names[i]);
2618 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2619 }
2620#endif
2621 return err;
2622}
2623
Mingming Cao617ba132006-10-11 01:20:53 -07002624static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002625{
2626 struct super_block *sb = dentry->d_sb;
Mingming Cao617ba132006-10-11 01:20:53 -07002627 struct ext4_sb_info *sbi = EXT4_SB(sb);
2628 struct ext4_super_block *es = sbi->s_es;
Pekka Enberg960cc392006-12-06 20:35:29 -08002629 u64 fsid;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002630
Badari Pulavarty5e700302007-07-15 23:42:00 -07002631 if (test_opt(sb, MINIX_DF)) {
2632 sbi->s_overhead_last = 0;
2633 } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2634 unsigned long ngroups = sbi->s_groups_count, i;
2635 ext4_fsblk_t overhead = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002636 smp_rmb();
2637
2638 /*
Badari Pulavarty5e700302007-07-15 23:42:00 -07002639 * Compute the overhead (FS structures). This is constant
2640 * for a given filesystem unless the number of block groups
2641 * changes so we cache the previous value until it does.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002642 */
2643
2644 /*
2645 * All of the blocks before first_data_block are
2646 * overhead
2647 */
2648 overhead = le32_to_cpu(es->s_first_data_block);
2649
2650 /*
2651 * Add the overhead attributed to the superblock and
2652 * block group descriptors. If the sparse superblocks
2653 * feature is turned on, then not all groups have this.
2654 */
2655 for (i = 0; i < ngroups; i++) {
Mingming Cao617ba132006-10-11 01:20:53 -07002656 overhead += ext4_bg_has_super(sb, i) +
2657 ext4_bg_num_gdb(sb, i);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002658 cond_resched();
2659 }
2660
2661 /*
2662 * Every block group has an inode bitmap, a block
2663 * bitmap, and an inode table.
2664 */
Badari Pulavarty5e700302007-07-15 23:42:00 -07002665 overhead += ngroups * (2 + sbi->s_itb_per_group);
2666 sbi->s_overhead_last = overhead;
2667 smp_wmb();
2668 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002669 }
2670
Mingming Cao617ba132006-10-11 01:20:53 -07002671 buf->f_type = EXT4_SUPER_MAGIC;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002672 buf->f_bsize = sb->s_blocksize;
Badari Pulavarty5e700302007-07-15 23:42:00 -07002673 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
Peter Zijlstra52d9f3b2007-10-16 23:25:44 -07002674 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
Badari Pulavarty5e700302007-07-15 23:42:00 -07002675 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002676 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
2677 if (buf->f_bfree < ext4_r_blocks_count(es))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002678 buf->f_bavail = 0;
2679 buf->f_files = le32_to_cpu(es->s_inodes_count);
Peter Zijlstra52d9f3b2007-10-16 23:25:44 -07002680 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
Badari Pulavarty5e700302007-07-15 23:42:00 -07002681 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
Mingming Cao617ba132006-10-11 01:20:53 -07002682 buf->f_namelen = EXT4_NAME_LEN;
Pekka Enberg960cc392006-12-06 20:35:29 -08002683 fsid = le64_to_cpup((void *)es->s_uuid) ^
2684 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2685 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2686 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002687 return 0;
2688}
2689
2690/* Helper function for writing quotas on sync - we need to start transaction before quota file
2691 * is locked for write. Otherwise the are possible deadlocks:
2692 * Process 1 Process 2
Mingming Cao617ba132006-10-11 01:20:53 -07002693 * ext4_create() quota_sync()
Mingming Caodab291a2006-10-11 01:21:01 -07002694 * jbd2_journal_start() write_dquot()
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002695 * DQUOT_INIT() down(dqio_mutex)
Mingming Caodab291a2006-10-11 01:21:01 -07002696 * down(dqio_mutex) jbd2_journal_start()
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002697 *
2698 */
2699
2700#ifdef CONFIG_QUOTA
2701
2702static inline struct inode *dquot_to_inode(struct dquot *dquot)
2703{
2704 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2705}
2706
Mingming Cao617ba132006-10-11 01:20:53 -07002707static int ext4_dquot_initialize(struct inode *inode, int type)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002708{
2709 handle_t *handle;
2710 int ret, err;
2711
2712 /* We may create quota structure so we need to reserve enough blocks */
Mingming Cao617ba132006-10-11 01:20:53 -07002713 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002714 if (IS_ERR(handle))
2715 return PTR_ERR(handle);
2716 ret = dquot_initialize(inode, type);
Mingming Cao617ba132006-10-11 01:20:53 -07002717 err = ext4_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002718 if (!ret)
2719 ret = err;
2720 return ret;
2721}
2722
Mingming Cao617ba132006-10-11 01:20:53 -07002723static int ext4_dquot_drop(struct inode *inode)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002724{
2725 handle_t *handle;
2726 int ret, err;
2727
2728 /* We may delete quota structure so we need to reserve enough blocks */
Mingming Cao617ba132006-10-11 01:20:53 -07002729 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002730 if (IS_ERR(handle))
2731 return PTR_ERR(handle);
2732 ret = dquot_drop(inode);
Mingming Cao617ba132006-10-11 01:20:53 -07002733 err = ext4_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002734 if (!ret)
2735 ret = err;
2736 return ret;
2737}
2738
Mingming Cao617ba132006-10-11 01:20:53 -07002739static int ext4_write_dquot(struct dquot *dquot)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002740{
2741 int ret, err;
2742 handle_t *handle;
2743 struct inode *inode;
2744
2745 inode = dquot_to_inode(dquot);
Mingming Cao617ba132006-10-11 01:20:53 -07002746 handle = ext4_journal_start(inode,
2747 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002748 if (IS_ERR(handle))
2749 return PTR_ERR(handle);
2750 ret = dquot_commit(dquot);
Mingming Cao617ba132006-10-11 01:20:53 -07002751 err = ext4_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002752 if (!ret)
2753 ret = err;
2754 return ret;
2755}
2756
Mingming Cao617ba132006-10-11 01:20:53 -07002757static int ext4_acquire_dquot(struct dquot *dquot)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002758{
2759 int ret, err;
2760 handle_t *handle;
2761
Mingming Cao617ba132006-10-11 01:20:53 -07002762 handle = ext4_journal_start(dquot_to_inode(dquot),
2763 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002764 if (IS_ERR(handle))
2765 return PTR_ERR(handle);
2766 ret = dquot_acquire(dquot);
Mingming Cao617ba132006-10-11 01:20:53 -07002767 err = ext4_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002768 if (!ret)
2769 ret = err;
2770 return ret;
2771}
2772
Mingming Cao617ba132006-10-11 01:20:53 -07002773static int ext4_release_dquot(struct dquot *dquot)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002774{
2775 int ret, err;
2776 handle_t *handle;
2777
Mingming Cao617ba132006-10-11 01:20:53 -07002778 handle = ext4_journal_start(dquot_to_inode(dquot),
2779 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
Jan Kara9c3013e2007-09-11 15:23:29 -07002780 if (IS_ERR(handle)) {
2781 /* Release dquot anyway to avoid endless cycle in dqput() */
2782 dquot_release(dquot);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002783 return PTR_ERR(handle);
Jan Kara9c3013e2007-09-11 15:23:29 -07002784 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002785 ret = dquot_release(dquot);
Mingming Cao617ba132006-10-11 01:20:53 -07002786 err = ext4_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002787 if (!ret)
2788 ret = err;
2789 return ret;
2790}
2791
Mingming Cao617ba132006-10-11 01:20:53 -07002792static int ext4_mark_dquot_dirty(struct dquot *dquot)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002793{
2794 /* Are we journalling quotas? */
Mingming Cao617ba132006-10-11 01:20:53 -07002795 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2796 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002797 dquot_mark_dquot_dirty(dquot);
Mingming Cao617ba132006-10-11 01:20:53 -07002798 return ext4_write_dquot(dquot);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002799 } else {
2800 return dquot_mark_dquot_dirty(dquot);
2801 }
2802}
2803
Mingming Cao617ba132006-10-11 01:20:53 -07002804static int ext4_write_info(struct super_block *sb, int type)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002805{
2806 int ret, err;
2807 handle_t *handle;
2808
2809 /* Data block + inode block */
Mingming Cao617ba132006-10-11 01:20:53 -07002810 handle = ext4_journal_start(sb->s_root->d_inode, 2);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002811 if (IS_ERR(handle))
2812 return PTR_ERR(handle);
2813 ret = dquot_commit_info(sb, type);
Mingming Cao617ba132006-10-11 01:20:53 -07002814 err = ext4_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002815 if (!ret)
2816 ret = err;
2817 return ret;
2818}
2819
2820/*
2821 * Turn on quotas during mount time - we need to find
2822 * the quota file and such...
2823 */
Mingming Cao617ba132006-10-11 01:20:53 -07002824static int ext4_quota_on_mount(struct super_block *sb, int type)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002825{
Mingming Cao617ba132006-10-11 01:20:53 -07002826 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
2827 EXT4_SB(sb)->s_jquota_fmt, type);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002828}
2829
2830/*
2831 * Standard function to be called on quota_on
2832 */
Mingming Cao617ba132006-10-11 01:20:53 -07002833static int ext4_quota_on(struct super_block *sb, int type, int format_id,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002834 char *path)
2835{
2836 int err;
2837 struct nameidata nd;
2838
2839 if (!test_opt(sb, QUOTA))
2840 return -EINVAL;
2841 /* Not journalling quota? */
Mingming Cao617ba132006-10-11 01:20:53 -07002842 if (!EXT4_SB(sb)->s_qf_names[USRQUOTA] &&
2843 !EXT4_SB(sb)->s_qf_names[GRPQUOTA])
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002844 return vfs_quota_on(sb, type, format_id, path);
2845 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2846 if (err)
2847 return err;
2848 /* Quotafile not on the same filesystem? */
2849 if (nd.mnt->mnt_sb != sb) {
2850 path_release(&nd);
2851 return -EXDEV;
2852 }
2853 /* Quotafile not of fs root? */
2854 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2855 printk(KERN_WARNING
Mingming Cao617ba132006-10-11 01:20:53 -07002856 "EXT4-fs: Quota file not on filesystem root. "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002857 "Journalled quota will not work.\n");
2858 path_release(&nd);
2859 return vfs_quota_on(sb, type, format_id, path);
2860}
2861
2862/* Read data from quotafile - avoid pagecache and such because we cannot afford
2863 * acquiring the locks... As quota files are never truncated and quota code
2864 * itself serializes the operations (and noone else should touch the files)
2865 * we don't have to be afraid of races */
Mingming Cao617ba132006-10-11 01:20:53 -07002866static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002867 size_t len, loff_t off)
2868{
2869 struct inode *inode = sb_dqopt(sb)->files[type];
Mingming Cao617ba132006-10-11 01:20:53 -07002870 sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002871 int err = 0;
2872 int offset = off & (sb->s_blocksize - 1);
2873 int tocopy;
2874 size_t toread;
2875 struct buffer_head *bh;
2876 loff_t i_size = i_size_read(inode);
2877
2878 if (off > i_size)
2879 return 0;
2880 if (off+len > i_size)
2881 len = i_size-off;
2882 toread = len;
2883 while (toread > 0) {
2884 tocopy = sb->s_blocksize - offset < toread ?
2885 sb->s_blocksize - offset : toread;
Mingming Cao617ba132006-10-11 01:20:53 -07002886 bh = ext4_bread(NULL, inode, blk, 0, &err);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002887 if (err)
2888 return err;
2889 if (!bh) /* A hole? */
2890 memset(data, 0, tocopy);
2891 else
2892 memcpy(data, bh->b_data+offset, tocopy);
2893 brelse(bh);
2894 offset = 0;
2895 toread -= tocopy;
2896 data += tocopy;
2897 blk++;
2898 }
2899 return len;
2900}
2901
2902/* Write to quotafile (we know the transaction is already started and has
2903 * enough credits) */
Mingming Cao617ba132006-10-11 01:20:53 -07002904static ssize_t ext4_quota_write(struct super_block *sb, int type,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002905 const char *data, size_t len, loff_t off)
2906{
2907 struct inode *inode = sb_dqopt(sb)->files[type];
Mingming Cao617ba132006-10-11 01:20:53 -07002908 sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002909 int err = 0;
2910 int offset = off & (sb->s_blocksize - 1);
2911 int tocopy;
Mingming Cao617ba132006-10-11 01:20:53 -07002912 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002913 size_t towrite = len;
2914 struct buffer_head *bh;
2915 handle_t *handle = journal_current_handle();
2916
Jan Kara9c3013e2007-09-11 15:23:29 -07002917 if (!handle) {
2918 printk(KERN_WARNING "EXT4-fs: Quota write (off=%Lu, len=%Lu)"
2919 " cancelled because transaction is not started.\n",
2920 (unsigned long long)off, (unsigned long long)len);
2921 return -EIO;
2922 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002923 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2924 while (towrite > 0) {
2925 tocopy = sb->s_blocksize - offset < towrite ?
2926 sb->s_blocksize - offset : towrite;
Mingming Cao617ba132006-10-11 01:20:53 -07002927 bh = ext4_bread(handle, inode, blk, 1, &err);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002928 if (!bh)
2929 goto out;
2930 if (journal_quota) {
Mingming Cao617ba132006-10-11 01:20:53 -07002931 err = ext4_journal_get_write_access(handle, bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002932 if (err) {
2933 brelse(bh);
2934 goto out;
2935 }
2936 }
2937 lock_buffer(bh);
2938 memcpy(bh->b_data+offset, data, tocopy);
2939 flush_dcache_page(bh->b_page);
2940 unlock_buffer(bh);
2941 if (journal_quota)
Mingming Cao617ba132006-10-11 01:20:53 -07002942 err = ext4_journal_dirty_metadata(handle, bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002943 else {
2944 /* Always do at least ordered writes for quotas */
Mingming Cao617ba132006-10-11 01:20:53 -07002945 err = ext4_journal_dirty_data(handle, bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002946 mark_buffer_dirty(bh);
2947 }
2948 brelse(bh);
2949 if (err)
2950 goto out;
2951 offset = 0;
2952 towrite -= tocopy;
2953 data += tocopy;
2954 blk++;
2955 }
2956out:
2957 if (len == towrite)
2958 return err;
2959 if (inode->i_size < off+len-towrite) {
2960 i_size_write(inode, off+len-towrite);
Mingming Cao617ba132006-10-11 01:20:53 -07002961 EXT4_I(inode)->i_disksize = inode->i_size;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002962 }
2963 inode->i_version++;
2964 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
Mingming Cao617ba132006-10-11 01:20:53 -07002965 ext4_mark_inode_dirty(handle, inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002966 mutex_unlock(&inode->i_mutex);
2967 return len - towrite;
2968}
2969
2970#endif
2971
Mingming Cao617ba132006-10-11 01:20:53 -07002972static int ext4_get_sb(struct file_system_type *fs_type,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002973 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
2974{
Mingming Cao617ba132006-10-11 01:20:53 -07002975 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002976}
2977
Mingming Cao617ba132006-10-11 01:20:53 -07002978static struct file_system_type ext4dev_fs_type = {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002979 .owner = THIS_MODULE,
Mingming Cao617ba132006-10-11 01:20:53 -07002980 .name = "ext4dev",
2981 .get_sb = ext4_get_sb,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002982 .kill_sb = kill_block_super,
2983 .fs_flags = FS_REQUIRES_DEV,
2984};
2985
Mingming Cao617ba132006-10-11 01:20:53 -07002986static int __init init_ext4_fs(void)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002987{
Mingming Cao617ba132006-10-11 01:20:53 -07002988 int err = init_ext4_xattr();
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002989 if (err)
2990 return err;
2991 err = init_inodecache();
2992 if (err)
2993 goto out1;
Andrew Morton63f57932006-10-11 01:21:24 -07002994 err = register_filesystem(&ext4dev_fs_type);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002995 if (err)
2996 goto out;
2997 return 0;
2998out:
2999 destroy_inodecache();
3000out1:
Mingming Cao617ba132006-10-11 01:20:53 -07003001 exit_ext4_xattr();
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003002 return err;
3003}
3004
Mingming Cao617ba132006-10-11 01:20:53 -07003005static void __exit exit_ext4_fs(void)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003006{
Mingming Cao617ba132006-10-11 01:20:53 -07003007 unregister_filesystem(&ext4dev_fs_type);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003008 destroy_inodecache();
Mingming Cao617ba132006-10-11 01:20:53 -07003009 exit_ext4_xattr();
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003010}
3011
3012MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
Mingming Cao617ba132006-10-11 01:20:53 -07003013MODULE_DESCRIPTION("Fourth Extended Filesystem with extents");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003014MODULE_LICENSE("GPL");
Mingming Cao617ba132006-10-11 01:20:53 -07003015module_init(init_ext4_fs)
3016module_exit(exit_ext4_fs)