blob: 157c64c9a4e773f134efe4b3292d3202fbf7118b [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 Lametere18b8902006-12-06 20:33:20 -0800526static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
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
Mingming Cao617ba132006-10-11 01:20:53 -0700599static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700600{
601 struct super_block *sb = vfs->mnt_sb;
602
Mingming Cao617ba132006-10-11 01:20:53 -0700603 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700604 seq_puts(seq, ",data=journal");
Mingming Cao617ba132006-10-11 01:20:53 -0700605 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700606 seq_puts(seq, ",data=ordered");
Mingming Cao617ba132006-10-11 01:20:53 -0700607 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700608 seq_puts(seq, ",data=writeback");
609
Mingming Cao617ba132006-10-11 01:20:53 -0700610 ext4_show_quota_options(seq, sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700611
612 return 0;
613}
614
615
Mingming Cao617ba132006-10-11 01:20:53 -0700616static struct dentry *ext4_get_dentry(struct super_block *sb, void *vobjp)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700617{
618 __u32 *objp = vobjp;
619 unsigned long ino = objp[0];
620 __u32 generation = objp[1];
621 struct inode *inode;
622 struct dentry *result;
623
Mingming Cao617ba132006-10-11 01:20:53 -0700624 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700625 return ERR_PTR(-ESTALE);
Mingming Cao617ba132006-10-11 01:20:53 -0700626 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700627 return ERR_PTR(-ESTALE);
628
629 /* iget isn't really right if the inode is currently unallocated!!
630 *
Mingming Cao617ba132006-10-11 01:20:53 -0700631 * ext4_read_inode will return a bad_inode if the inode had been
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700632 * deleted, so we should be safe.
633 *
634 * Currently we don't know the generation for parent directory, so
635 * a generation of 0 means "accept any"
636 */
637 inode = iget(sb, ino);
638 if (inode == NULL)
639 return ERR_PTR(-ENOMEM);
640 if (is_bad_inode(inode) ||
641 (generation && inode->i_generation != generation)) {
642 iput(inode);
643 return ERR_PTR(-ESTALE);
644 }
645 /* now to find a dentry.
646 * If possible, get a well-connected one
647 */
648 result = d_alloc_anon(inode);
649 if (!result) {
650 iput(inode);
651 return ERR_PTR(-ENOMEM);
652 }
653 return result;
654}
655
656#ifdef CONFIG_QUOTA
657#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
658#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
659
Mingming Cao617ba132006-10-11 01:20:53 -0700660static int ext4_dquot_initialize(struct inode *inode, int type);
661static int ext4_dquot_drop(struct inode *inode);
662static int ext4_write_dquot(struct dquot *dquot);
663static int ext4_acquire_dquot(struct dquot *dquot);
664static int ext4_release_dquot(struct dquot *dquot);
665static int ext4_mark_dquot_dirty(struct dquot *dquot);
666static int ext4_write_info(struct super_block *sb, int type);
667static int ext4_quota_on(struct super_block *sb, int type, int format_id, char *path);
668static int ext4_quota_on_mount(struct super_block *sb, int type);
669static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700670 size_t len, loff_t off);
Mingming Cao617ba132006-10-11 01:20:53 -0700671static ssize_t ext4_quota_write(struct super_block *sb, int type,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700672 const char *data, size_t len, loff_t off);
673
Mingming Cao617ba132006-10-11 01:20:53 -0700674static struct dquot_operations ext4_quota_operations = {
675 .initialize = ext4_dquot_initialize,
676 .drop = ext4_dquot_drop,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700677 .alloc_space = dquot_alloc_space,
678 .alloc_inode = dquot_alloc_inode,
679 .free_space = dquot_free_space,
680 .free_inode = dquot_free_inode,
681 .transfer = dquot_transfer,
Mingming Cao617ba132006-10-11 01:20:53 -0700682 .write_dquot = ext4_write_dquot,
683 .acquire_dquot = ext4_acquire_dquot,
684 .release_dquot = ext4_release_dquot,
685 .mark_dirty = ext4_mark_dquot_dirty,
686 .write_info = ext4_write_info
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700687};
688
Mingming Cao617ba132006-10-11 01:20:53 -0700689static struct quotactl_ops ext4_qctl_operations = {
690 .quota_on = ext4_quota_on,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700691 .quota_off = vfs_quota_off,
692 .quota_sync = vfs_quota_sync,
693 .get_info = vfs_get_dqinfo,
694 .set_info = vfs_set_dqinfo,
695 .get_dqblk = vfs_get_dqblk,
696 .set_dqblk = vfs_set_dqblk
697};
698#endif
699
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800700static const struct super_operations ext4_sops = {
Mingming Cao617ba132006-10-11 01:20:53 -0700701 .alloc_inode = ext4_alloc_inode,
702 .destroy_inode = ext4_destroy_inode,
703 .read_inode = ext4_read_inode,
704 .write_inode = ext4_write_inode,
705 .dirty_inode = ext4_dirty_inode,
706 .delete_inode = ext4_delete_inode,
707 .put_super = ext4_put_super,
708 .write_super = ext4_write_super,
709 .sync_fs = ext4_sync_fs,
710 .write_super_lockfs = ext4_write_super_lockfs,
711 .unlockfs = ext4_unlockfs,
712 .statfs = ext4_statfs,
713 .remount_fs = ext4_remount,
714 .clear_inode = ext4_clear_inode,
715 .show_options = ext4_show_options,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700716#ifdef CONFIG_QUOTA
Mingming Cao617ba132006-10-11 01:20:53 -0700717 .quota_read = ext4_quota_read,
718 .quota_write = ext4_quota_write,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700719#endif
720};
721
Mingming Cao617ba132006-10-11 01:20:53 -0700722static struct export_operations ext4_export_ops = {
723 .get_parent = ext4_get_parent,
724 .get_dentry = ext4_get_dentry,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700725};
726
727enum {
728 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
729 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
730 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
731 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
732 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
733 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
734 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
735 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
736 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
737 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
Mingming Cao1e2462f2007-07-18 09:00:55 -0400738 Opt_grpquota, Opt_extents, Opt_noextents,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700739};
740
741static match_table_t tokens = {
742 {Opt_bsd_df, "bsddf"},
743 {Opt_minix_df, "minixdf"},
744 {Opt_grpid, "grpid"},
745 {Opt_grpid, "bsdgroups"},
746 {Opt_nogrpid, "nogrpid"},
747 {Opt_nogrpid, "sysvgroups"},
748 {Opt_resgid, "resgid=%u"},
749 {Opt_resuid, "resuid=%u"},
750 {Opt_sb, "sb=%u"},
751 {Opt_err_cont, "errors=continue"},
752 {Opt_err_panic, "errors=panic"},
753 {Opt_err_ro, "errors=remount-ro"},
754 {Opt_nouid32, "nouid32"},
755 {Opt_nocheck, "nocheck"},
756 {Opt_nocheck, "check=none"},
757 {Opt_debug, "debug"},
758 {Opt_oldalloc, "oldalloc"},
759 {Opt_orlov, "orlov"},
760 {Opt_user_xattr, "user_xattr"},
761 {Opt_nouser_xattr, "nouser_xattr"},
762 {Opt_acl, "acl"},
763 {Opt_noacl, "noacl"},
764 {Opt_reservation, "reservation"},
765 {Opt_noreservation, "noreservation"},
766 {Opt_noload, "noload"},
767 {Opt_nobh, "nobh"},
768 {Opt_bh, "bh"},
769 {Opt_commit, "commit=%u"},
770 {Opt_journal_update, "journal=update"},
771 {Opt_journal_inum, "journal=%u"},
772 {Opt_journal_dev, "journal_dev=%u"},
773 {Opt_abort, "abort"},
774 {Opt_data_journal, "data=journal"},
775 {Opt_data_ordered, "data=ordered"},
776 {Opt_data_writeback, "data=writeback"},
777 {Opt_offusrjquota, "usrjquota="},
778 {Opt_usrjquota, "usrjquota=%s"},
779 {Opt_offgrpjquota, "grpjquota="},
780 {Opt_grpjquota, "grpjquota=%s"},
781 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
782 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
783 {Opt_grpquota, "grpquota"},
784 {Opt_noquota, "noquota"},
785 {Opt_quota, "quota"},
786 {Opt_usrquota, "usrquota"},
787 {Opt_barrier, "barrier=%u"},
Alex Tomasa86c6182006-10-11 01:21:03 -0700788 {Opt_extents, "extents"},
Mingming Cao1e2462f2007-07-18 09:00:55 -0400789 {Opt_noextents, "noextents"},
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700790 {Opt_err, NULL},
791 {Opt_resize, "resize"},
792};
793
Mingming Cao617ba132006-10-11 01:20:53 -0700794static ext4_fsblk_t get_sb_block(void **data)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700795{
Mingming Cao617ba132006-10-11 01:20:53 -0700796 ext4_fsblk_t sb_block;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700797 char *options = (char *) *data;
798
799 if (!options || strncmp(options, "sb=", 3) != 0)
800 return 1; /* Default location */
801 options += 3;
Mingming Cao617ba132006-10-11 01:20:53 -0700802 /*todo: use simple_strtoll with >32bit ext4 */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700803 sb_block = simple_strtoul(options, &options, 0);
804 if (*options && *options != ',') {
Mingming Cao617ba132006-10-11 01:20:53 -0700805 printk("EXT4-fs: Invalid sb specification: %s\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700806 (char *) *data);
807 return 1;
808 }
809 if (*options == ',')
810 options++;
811 *data = (void *) options;
812 return sb_block;
813}
814
815static int parse_options (char *options, struct super_block *sb,
816 unsigned int *inum, unsigned long *journal_devnum,
Mingming Cao617ba132006-10-11 01:20:53 -0700817 ext4_fsblk_t *n_blocks_count, int is_remount)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700818{
Mingming Cao617ba132006-10-11 01:20:53 -0700819 struct ext4_sb_info *sbi = EXT4_SB(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700820 char * p;
821 substring_t args[MAX_OPT_ARGS];
822 int data_opt = 0;
823 int option;
824#ifdef CONFIG_QUOTA
825 int qtype;
826 char *qname;
827#endif
828
829 if (!options)
830 return 1;
831
832 while ((p = strsep (&options, ",")) != NULL) {
833 int token;
834 if (!*p)
835 continue;
836
837 token = match_token(p, tokens, args);
838 switch (token) {
839 case Opt_bsd_df:
840 clear_opt (sbi->s_mount_opt, MINIX_DF);
841 break;
842 case Opt_minix_df:
843 set_opt (sbi->s_mount_opt, MINIX_DF);
844 break;
845 case Opt_grpid:
846 set_opt (sbi->s_mount_opt, GRPID);
847 break;
848 case Opt_nogrpid:
849 clear_opt (sbi->s_mount_opt, GRPID);
850 break;
851 case Opt_resuid:
852 if (match_int(&args[0], &option))
853 return 0;
854 sbi->s_resuid = option;
855 break;
856 case Opt_resgid:
857 if (match_int(&args[0], &option))
858 return 0;
859 sbi->s_resgid = option;
860 break;
861 case Opt_sb:
862 /* handled by get_sb_block() instead of here */
863 /* *sb_block = match_int(&args[0]); */
864 break;
865 case Opt_err_panic:
866 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
867 clear_opt (sbi->s_mount_opt, ERRORS_RO);
868 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
869 break;
870 case Opt_err_ro:
871 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
872 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
873 set_opt (sbi->s_mount_opt, ERRORS_RO);
874 break;
875 case Opt_err_cont:
876 clear_opt (sbi->s_mount_opt, ERRORS_RO);
877 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
878 set_opt (sbi->s_mount_opt, ERRORS_CONT);
879 break;
880 case Opt_nouid32:
881 set_opt (sbi->s_mount_opt, NO_UID32);
882 break;
883 case Opt_nocheck:
884 clear_opt (sbi->s_mount_opt, CHECK);
885 break;
886 case Opt_debug:
887 set_opt (sbi->s_mount_opt, DEBUG);
888 break;
889 case Opt_oldalloc:
890 set_opt (sbi->s_mount_opt, OLDALLOC);
891 break;
892 case Opt_orlov:
893 clear_opt (sbi->s_mount_opt, OLDALLOC);
894 break;
Mingming Cao617ba132006-10-11 01:20:53 -0700895#ifdef CONFIG_EXT4DEV_FS_XATTR
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700896 case Opt_user_xattr:
897 set_opt (sbi->s_mount_opt, XATTR_USER);
898 break;
899 case Opt_nouser_xattr:
900 clear_opt (sbi->s_mount_opt, XATTR_USER);
901 break;
902#else
903 case Opt_user_xattr:
904 case Opt_nouser_xattr:
Mingming Cao617ba132006-10-11 01:20:53 -0700905 printk("EXT4 (no)user_xattr options not supported\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700906 break;
907#endif
Mingming Cao617ba132006-10-11 01:20:53 -0700908#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700909 case Opt_acl:
910 set_opt(sbi->s_mount_opt, POSIX_ACL);
911 break;
912 case Opt_noacl:
913 clear_opt(sbi->s_mount_opt, POSIX_ACL);
914 break;
915#else
916 case Opt_acl:
917 case Opt_noacl:
Mingming Cao617ba132006-10-11 01:20:53 -0700918 printk("EXT4 (no)acl options not supported\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700919 break;
920#endif
921 case Opt_reservation:
922 set_opt(sbi->s_mount_opt, RESERVATION);
923 break;
924 case Opt_noreservation:
925 clear_opt(sbi->s_mount_opt, RESERVATION);
926 break;
927 case Opt_journal_update:
928 /* @@@ FIXME */
929 /* Eventually we will want to be able to create
930 a journal file here. For now, only allow the
931 user to specify an existing inode to be the
932 journal file. */
933 if (is_remount) {
Mingming Cao617ba132006-10-11 01:20:53 -0700934 printk(KERN_ERR "EXT4-fs: cannot specify "
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700935 "journal on remount\n");
936 return 0;
937 }
938 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
939 break;
940 case Opt_journal_inum:
941 if (is_remount) {
Mingming Cao617ba132006-10-11 01:20:53 -0700942 printk(KERN_ERR "EXT4-fs: cannot specify "
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700943 "journal on remount\n");
944 return 0;
945 }
946 if (match_int(&args[0], &option))
947 return 0;
948 *inum = option;
949 break;
950 case Opt_journal_dev:
951 if (is_remount) {
Mingming Cao617ba132006-10-11 01:20:53 -0700952 printk(KERN_ERR "EXT4-fs: cannot specify "
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700953 "journal on remount\n");
954 return 0;
955 }
956 if (match_int(&args[0], &option))
957 return 0;
958 *journal_devnum = option;
959 break;
960 case Opt_noload:
961 set_opt (sbi->s_mount_opt, NOLOAD);
962 break;
963 case Opt_commit:
964 if (match_int(&args[0], &option))
965 return 0;
966 if (option < 0)
967 return 0;
968 if (option == 0)
969 option = JBD_DEFAULT_MAX_COMMIT_AGE;
970 sbi->s_commit_interval = HZ * option;
971 break;
972 case Opt_data_journal:
Mingming Cao617ba132006-10-11 01:20:53 -0700973 data_opt = EXT4_MOUNT_JOURNAL_DATA;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700974 goto datacheck;
975 case Opt_data_ordered:
Mingming Cao617ba132006-10-11 01:20:53 -0700976 data_opt = EXT4_MOUNT_ORDERED_DATA;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700977 goto datacheck;
978 case Opt_data_writeback:
Mingming Cao617ba132006-10-11 01:20:53 -0700979 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700980 datacheck:
981 if (is_remount) {
Mingming Cao617ba132006-10-11 01:20:53 -0700982 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700983 != data_opt) {
984 printk(KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -0700985 "EXT4-fs: cannot change data "
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700986 "mode on remount\n");
987 return 0;
988 }
989 } else {
Mingming Cao617ba132006-10-11 01:20:53 -0700990 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700991 sbi->s_mount_opt |= data_opt;
992 }
993 break;
994#ifdef CONFIG_QUOTA
995 case Opt_usrjquota:
996 qtype = USRQUOTA;
997 goto set_qf_name;
998 case Opt_grpjquota:
999 qtype = GRPQUOTA;
1000set_qf_name:
1001 if (sb_any_quota_enabled(sb)) {
1002 printk(KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001003 "EXT4-fs: Cannot change journalled "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001004 "quota options when quota turned on.\n");
1005 return 0;
1006 }
1007 qname = match_strdup(&args[0]);
1008 if (!qname) {
1009 printk(KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001010 "EXT4-fs: not enough memory for "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001011 "storing quotafile name.\n");
1012 return 0;
1013 }
1014 if (sbi->s_qf_names[qtype] &&
1015 strcmp(sbi->s_qf_names[qtype], qname)) {
1016 printk(KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001017 "EXT4-fs: %s quota file already "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001018 "specified.\n", QTYPE2NAME(qtype));
1019 kfree(qname);
1020 return 0;
1021 }
1022 sbi->s_qf_names[qtype] = qname;
1023 if (strchr(sbi->s_qf_names[qtype], '/')) {
1024 printk(KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001025 "EXT4-fs: quotafile must be on "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001026 "filesystem root.\n");
1027 kfree(sbi->s_qf_names[qtype]);
1028 sbi->s_qf_names[qtype] = NULL;
1029 return 0;
1030 }
1031 set_opt(sbi->s_mount_opt, QUOTA);
1032 break;
1033 case Opt_offusrjquota:
1034 qtype = USRQUOTA;
1035 goto clear_qf_name;
1036 case Opt_offgrpjquota:
1037 qtype = GRPQUOTA;
1038clear_qf_name:
1039 if (sb_any_quota_enabled(sb)) {
Mingming Cao617ba132006-10-11 01:20:53 -07001040 printk(KERN_ERR "EXT4-fs: Cannot change "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001041 "journalled quota options when "
1042 "quota turned on.\n");
1043 return 0;
1044 }
1045 /*
1046 * The space will be released later when all options
1047 * are confirmed to be correct
1048 */
1049 sbi->s_qf_names[qtype] = NULL;
1050 break;
1051 case Opt_jqfmt_vfsold:
1052 sbi->s_jquota_fmt = QFMT_VFS_OLD;
1053 break;
1054 case Opt_jqfmt_vfsv0:
1055 sbi->s_jquota_fmt = QFMT_VFS_V0;
1056 break;
1057 case Opt_quota:
1058 case Opt_usrquota:
1059 set_opt(sbi->s_mount_opt, QUOTA);
1060 set_opt(sbi->s_mount_opt, USRQUOTA);
1061 break;
1062 case Opt_grpquota:
1063 set_opt(sbi->s_mount_opt, QUOTA);
1064 set_opt(sbi->s_mount_opt, GRPQUOTA);
1065 break;
1066 case Opt_noquota:
1067 if (sb_any_quota_enabled(sb)) {
Mingming Cao617ba132006-10-11 01:20:53 -07001068 printk(KERN_ERR "EXT4-fs: Cannot change quota "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001069 "options when quota turned on.\n");
1070 return 0;
1071 }
1072 clear_opt(sbi->s_mount_opt, QUOTA);
1073 clear_opt(sbi->s_mount_opt, USRQUOTA);
1074 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1075 break;
1076#else
1077 case Opt_quota:
1078 case Opt_usrquota:
1079 case Opt_grpquota:
1080 case Opt_usrjquota:
1081 case Opt_grpjquota:
1082 case Opt_offusrjquota:
1083 case Opt_offgrpjquota:
1084 case Opt_jqfmt_vfsold:
1085 case Opt_jqfmt_vfsv0:
1086 printk(KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001087 "EXT4-fs: journalled quota options not "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001088 "supported.\n");
1089 break;
1090 case Opt_noquota:
1091 break;
1092#endif
1093 case Opt_abort:
1094 set_opt(sbi->s_mount_opt, ABORT);
1095 break;
1096 case Opt_barrier:
1097 if (match_int(&args[0], &option))
1098 return 0;
1099 if (option)
1100 set_opt(sbi->s_mount_opt, BARRIER);
1101 else
1102 clear_opt(sbi->s_mount_opt, BARRIER);
1103 break;
1104 case Opt_ignore:
1105 break;
1106 case Opt_resize:
1107 if (!is_remount) {
Mingming Cao617ba132006-10-11 01:20:53 -07001108 printk("EXT4-fs: resize option only available "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001109 "for remount\n");
1110 return 0;
1111 }
1112 if (match_int(&args[0], &option) != 0)
1113 return 0;
1114 *n_blocks_count = option;
1115 break;
1116 case Opt_nobh:
1117 set_opt(sbi->s_mount_opt, NOBH);
1118 break;
1119 case Opt_bh:
1120 clear_opt(sbi->s_mount_opt, NOBH);
1121 break;
Alex Tomasa86c6182006-10-11 01:21:03 -07001122 case Opt_extents:
1123 set_opt (sbi->s_mount_opt, EXTENTS);
1124 break;
Mingming Cao1e2462f2007-07-18 09:00:55 -04001125 case Opt_noextents:
1126 clear_opt (sbi->s_mount_opt, EXTENTS);
1127 break;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001128 default:
1129 printk (KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001130 "EXT4-fs: Unrecognized mount option \"%s\" "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001131 "or missing value\n", p);
1132 return 0;
1133 }
1134 }
1135#ifdef CONFIG_QUOTA
1136 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
Mingming Cao617ba132006-10-11 01:20:53 -07001137 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001138 sbi->s_qf_names[USRQUOTA])
1139 clear_opt(sbi->s_mount_opt, USRQUOTA);
1140
Mingming Cao617ba132006-10-11 01:20:53 -07001141 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001142 sbi->s_qf_names[GRPQUOTA])
1143 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1144
1145 if ((sbi->s_qf_names[USRQUOTA] &&
Mingming Cao617ba132006-10-11 01:20:53 -07001146 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001147 (sbi->s_qf_names[GRPQUOTA] &&
Mingming Cao617ba132006-10-11 01:20:53 -07001148 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
1149 printk(KERN_ERR "EXT4-fs: old and new quota "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001150 "format mixing.\n");
1151 return 0;
1152 }
1153
1154 if (!sbi->s_jquota_fmt) {
Mingming Cao617ba132006-10-11 01:20:53 -07001155 printk(KERN_ERR "EXT4-fs: journalled quota format "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001156 "not specified.\n");
1157 return 0;
1158 }
1159 } else {
1160 if (sbi->s_jquota_fmt) {
Mingming Cao617ba132006-10-11 01:20:53 -07001161 printk(KERN_ERR "EXT4-fs: journalled quota format "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001162 "specified with no journalling "
1163 "enabled.\n");
1164 return 0;
1165 }
1166 }
1167#endif
1168 return 1;
1169}
1170
Mingming Cao617ba132006-10-11 01:20:53 -07001171static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001172 int read_only)
1173{
Mingming Cao617ba132006-10-11 01:20:53 -07001174 struct ext4_sb_info *sbi = EXT4_SB(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001175 int res = 0;
1176
Mingming Cao617ba132006-10-11 01:20:53 -07001177 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1178 printk (KERN_ERR "EXT4-fs warning: revision level too high, "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001179 "forcing read-only mode\n");
1180 res = MS_RDONLY;
1181 }
1182 if (read_only)
1183 return res;
Mingming Cao617ba132006-10-11 01:20:53 -07001184 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1185 printk (KERN_WARNING "EXT4-fs warning: mounting unchecked fs, "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001186 "running e2fsck is recommended\n");
Mingming Cao617ba132006-10-11 01:20:53 -07001187 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001188 printk (KERN_WARNING
Mingming Cao617ba132006-10-11 01:20:53 -07001189 "EXT4-fs warning: mounting fs with errors, "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001190 "running e2fsck is recommended\n");
1191 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1192 le16_to_cpu(es->s_mnt_count) >=
1193 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1194 printk (KERN_WARNING
Mingming Cao617ba132006-10-11 01:20:53 -07001195 "EXT4-fs warning: maximal mount count reached, "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001196 "running e2fsck is recommended\n");
1197 else if (le32_to_cpu(es->s_checkinterval) &&
1198 (le32_to_cpu(es->s_lastcheck) +
1199 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1200 printk (KERN_WARNING
Mingming Cao617ba132006-10-11 01:20:53 -07001201 "EXT4-fs warning: checktime reached, "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001202 "running e2fsck is recommended\n");
1203#if 0
1204 /* @@@ We _will_ want to clear the valid bit if we find
Andrew Morton63f57932006-10-11 01:21:24 -07001205 * inconsistencies, to force a fsck at reboot. But for
1206 * a plain journaled filesystem we can keep it set as
1207 * valid forever! :)
1208 */
Mingming Cao617ba132006-10-11 01:20:53 -07001209 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT4_VALID_FS);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001210#endif
1211 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
Mingming Cao617ba132006-10-11 01:20:53 -07001212 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001213 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
1214 es->s_mtime = cpu_to_le32(get_seconds());
Mingming Cao617ba132006-10-11 01:20:53 -07001215 ext4_update_dynamic_rev(sb);
1216 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001217
Mingming Cao617ba132006-10-11 01:20:53 -07001218 ext4_commit_super(sb, es, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001219 if (test_opt(sb, DEBUG))
Mingming Cao617ba132006-10-11 01:20:53 -07001220 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001221 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1222 sb->s_blocksize,
1223 sbi->s_groups_count,
Mingming Cao617ba132006-10-11 01:20:53 -07001224 EXT4_BLOCKS_PER_GROUP(sb),
1225 EXT4_INODES_PER_GROUP(sb),
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001226 sbi->s_mount_opt);
1227
Mingming Cao617ba132006-10-11 01:20:53 -07001228 printk(KERN_INFO "EXT4 FS on %s, ", sb->s_id);
1229 if (EXT4_SB(sb)->s_journal->j_inode == NULL) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001230 char b[BDEVNAME_SIZE];
1231
1232 printk("external journal on %s\n",
Mingming Cao617ba132006-10-11 01:20:53 -07001233 bdevname(EXT4_SB(sb)->s_journal->j_dev, b));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001234 } else {
1235 printk("internal journal\n");
1236 }
1237 return res;
1238}
1239
1240/* Called at mount-time, super-block is locked */
Mingming Cao617ba132006-10-11 01:20:53 -07001241static int ext4_check_descriptors (struct super_block * sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001242{
Mingming Cao617ba132006-10-11 01:20:53 -07001243 struct ext4_sb_info *sbi = EXT4_SB(sb);
1244 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1245 ext4_fsblk_t last_block;
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001246 ext4_fsblk_t block_bitmap;
1247 ext4_fsblk_t inode_bitmap;
1248 ext4_fsblk_t inode_table;
Mingming Cao617ba132006-10-11 01:20:53 -07001249 struct ext4_group_desc * gdp = NULL;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001250 int desc_block = 0;
1251 int i;
1252
Mingming Cao617ba132006-10-11 01:20:53 -07001253 ext4_debug ("Checking group descriptors");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001254
1255 for (i = 0; i < sbi->s_groups_count; i++)
1256 {
1257 if (i == sbi->s_groups_count - 1)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001258 last_block = ext4_blocks_count(sbi->s_es) - 1;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001259 else
1260 last_block = first_block +
Mingming Cao617ba132006-10-11 01:20:53 -07001261 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001262
Mingming Cao617ba132006-10-11 01:20:53 -07001263 if ((i % EXT4_DESC_PER_BLOCK(sb)) == 0)
1264 gdp = (struct ext4_group_desc *)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001265 sbi->s_group_desc[desc_block++]->b_data;
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07001266 block_bitmap = ext4_block_bitmap(sb, gdp);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001267 if (block_bitmap < first_block || block_bitmap > last_block)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001268 {
Mingming Cao617ba132006-10-11 01:20:53 -07001269 ext4_error (sb, "ext4_check_descriptors",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001270 "Block bitmap for group %d"
Mingming Cao2ae02102006-10-11 01:21:11 -07001271 " not in group (block %llu)!",
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001272 i, block_bitmap);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001273 return 0;
1274 }
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07001275 inode_bitmap = ext4_inode_bitmap(sb, gdp);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001276 if (inode_bitmap < first_block || inode_bitmap > last_block)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001277 {
Mingming Cao617ba132006-10-11 01:20:53 -07001278 ext4_error (sb, "ext4_check_descriptors",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001279 "Inode bitmap for group %d"
Mingming Cao2ae02102006-10-11 01:21:11 -07001280 " not in group (block %llu)!",
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001281 i, inode_bitmap);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001282 return 0;
1283 }
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07001284 inode_table = ext4_inode_table(sb, gdp);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001285 if (inode_table < first_block ||
Eric Sandeen780dcdb2007-07-26 10:41:11 -07001286 inode_table + sbi->s_itb_per_group - 1 > last_block)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001287 {
Mingming Cao617ba132006-10-11 01:20:53 -07001288 ext4_error (sb, "ext4_check_descriptors",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001289 "Inode table for group %d"
Mingming Cao2ae02102006-10-11 01:21:11 -07001290 " not in group (block %llu)!",
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001291 i, inode_table);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001292 return 0;
1293 }
Mingming Cao617ba132006-10-11 01:20:53 -07001294 first_block += EXT4_BLOCKS_PER_GROUP(sb);
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07001295 gdp = (struct ext4_group_desc *)
1296 ((__u8 *)gdp + EXT4_DESC_SIZE(sb));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001297 }
1298
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001299 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
Mingming Cao617ba132006-10-11 01:20:53 -07001300 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext4_count_free_inodes(sb));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001301 return 1;
1302}
1303
1304
Mingming Cao617ba132006-10-11 01:20:53 -07001305/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001306 * the superblock) which were deleted from all directories, but held open by
1307 * a process at the time of a crash. We walk the list and try to delete these
1308 * inodes at recovery time (only with a read-write filesystem).
1309 *
1310 * In order to keep the orphan inode chain consistent during traversal (in
1311 * case of crash during recovery), we link each inode into the superblock
1312 * orphan list_head and handle it the same way as an inode deletion during
1313 * normal operation (which journals the operations for us).
1314 *
1315 * We only do an iget() and an iput() on each inode, which is very safe if we
1316 * accidentally point at an in-use or already deleted inode. The worst that
1317 * can happen in this case is that we get a "bit already cleared" message from
Mingming Cao617ba132006-10-11 01:20:53 -07001318 * ext4_free_inode(). The only reason we would point at a wrong inode is if
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001319 * e2fsck was run on this filesystem, and it must have already done the orphan
1320 * inode cleanup for us, so we can safely abort without any further action.
1321 */
Mingming Cao617ba132006-10-11 01:20:53 -07001322static void ext4_orphan_cleanup (struct super_block * sb,
1323 struct ext4_super_block * es)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001324{
1325 unsigned int s_flags = sb->s_flags;
1326 int nr_orphans = 0, nr_truncates = 0;
1327#ifdef CONFIG_QUOTA
1328 int i;
1329#endif
1330 if (!es->s_last_orphan) {
1331 jbd_debug(4, "no orphan inodes to clean up\n");
1332 return;
1333 }
1334
Eric Sandeena8f48a92006-12-06 20:40:13 -08001335 if (bdev_read_only(sb->s_bdev)) {
1336 printk(KERN_ERR "EXT4-fs: write access "
1337 "unavailable, skipping orphan cleanup.\n");
1338 return;
1339 }
1340
Mingming Cao617ba132006-10-11 01:20:53 -07001341 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001342 if (es->s_last_orphan)
1343 jbd_debug(1, "Errors on filesystem, "
1344 "clearing orphan list.\n");
1345 es->s_last_orphan = 0;
1346 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1347 return;
1348 }
1349
1350 if (s_flags & MS_RDONLY) {
Mingming Cao617ba132006-10-11 01:20:53 -07001351 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001352 sb->s_id);
1353 sb->s_flags &= ~MS_RDONLY;
1354 }
1355#ifdef CONFIG_QUOTA
1356 /* Needed for iput() to work correctly and not trash data */
1357 sb->s_flags |= MS_ACTIVE;
1358 /* Turn on quotas so that they are updated correctly */
1359 for (i = 0; i < MAXQUOTAS; i++) {
Mingming Cao617ba132006-10-11 01:20:53 -07001360 if (EXT4_SB(sb)->s_qf_names[i]) {
1361 int ret = ext4_quota_on_mount(sb, i);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001362 if (ret < 0)
1363 printk(KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001364 "EXT4-fs: Cannot turn on journalled "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001365 "quota: error %d\n", ret);
1366 }
1367 }
1368#endif
1369
1370 while (es->s_last_orphan) {
1371 struct inode *inode;
1372
1373 if (!(inode =
Mingming Cao617ba132006-10-11 01:20:53 -07001374 ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001375 es->s_last_orphan = 0;
1376 break;
1377 }
1378
Mingming Cao617ba132006-10-11 01:20:53 -07001379 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001380 DQUOT_INIT(inode);
1381 if (inode->i_nlink) {
1382 printk(KERN_DEBUG
1383 "%s: truncating inode %lu to %Ld bytes\n",
1384 __FUNCTION__, inode->i_ino, inode->i_size);
1385 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1386 inode->i_ino, inode->i_size);
Mingming Cao617ba132006-10-11 01:20:53 -07001387 ext4_truncate(inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001388 nr_truncates++;
1389 } else {
1390 printk(KERN_DEBUG
1391 "%s: deleting unreferenced inode %lu\n",
1392 __FUNCTION__, inode->i_ino);
1393 jbd_debug(2, "deleting unreferenced inode %lu\n",
1394 inode->i_ino);
1395 nr_orphans++;
1396 }
1397 iput(inode); /* The delete magic happens here! */
1398 }
1399
1400#define PLURAL(x) (x), ((x)==1) ? "" : "s"
1401
1402 if (nr_orphans)
Mingming Cao617ba132006-10-11 01:20:53 -07001403 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001404 sb->s_id, PLURAL(nr_orphans));
1405 if (nr_truncates)
Mingming Cao617ba132006-10-11 01:20:53 -07001406 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001407 sb->s_id, PLURAL(nr_truncates));
1408#ifdef CONFIG_QUOTA
1409 /* Turn quotas off */
1410 for (i = 0; i < MAXQUOTAS; i++) {
1411 if (sb_dqopt(sb)->files[i])
1412 vfs_quota_off(sb, i);
1413 }
1414#endif
1415 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1416}
1417
1418#define log2(n) ffz(~(n))
1419
1420/*
1421 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1422 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1423 * We need to be 1 filesystem block less than the 2^32 sector limit.
1424 */
Mingming Cao617ba132006-10-11 01:20:53 -07001425static loff_t ext4_max_size(int bits)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001426{
Mingming Cao617ba132006-10-11 01:20:53 -07001427 loff_t res = EXT4_NDIR_BLOCKS;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001428 /* This constant is calculated to be the largest file size for a
1429 * dense, 4k-blocksize file such that the total number of
1430 * sectors in the file, including data and all indirect blocks,
1431 * does not exceed 2^32. */
1432 const loff_t upper_limit = 0x1ff7fffd000LL;
1433
1434 res += 1LL << (bits-2);
1435 res += 1LL << (2*(bits-2));
1436 res += 1LL << (3*(bits-2));
1437 res <<= bits;
1438 if (res > upper_limit)
1439 res = upper_limit;
1440 return res;
1441}
1442
Mingming Cao617ba132006-10-11 01:20:53 -07001443static ext4_fsblk_t descriptor_loc(struct super_block *sb,
Andrew Morton70bbb3e2006-10-11 01:21:20 -07001444 ext4_fsblk_t logical_sb_block, int nr)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001445{
Mingming Cao617ba132006-10-11 01:20:53 -07001446 struct ext4_sb_info *sbi = EXT4_SB(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001447 unsigned long bg, first_meta_bg;
1448 int has_super = 0;
1449
1450 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1451
Mingming Cao617ba132006-10-11 01:20:53 -07001452 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001453 nr < first_meta_bg)
Andrew Morton70bbb3e2006-10-11 01:21:20 -07001454 return logical_sb_block + nr + 1;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001455 bg = sbi->s_desc_per_block * nr;
Mingming Cao617ba132006-10-11 01:20:53 -07001456 if (ext4_bg_has_super(sb, bg))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001457 has_super = 1;
Mingming Cao617ba132006-10-11 01:20:53 -07001458 return (has_super + ext4_group_first_block_no(sb, bg));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001459}
1460
1461
Mingming Cao617ba132006-10-11 01:20:53 -07001462static int ext4_fill_super (struct super_block *sb, void *data, int silent)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001463{
1464 struct buffer_head * bh;
Mingming Cao617ba132006-10-11 01:20:53 -07001465 struct ext4_super_block *es = NULL;
1466 struct ext4_sb_info *sbi;
1467 ext4_fsblk_t block;
1468 ext4_fsblk_t sb_block = get_sb_block(&data);
Andrew Morton70bbb3e2006-10-11 01:21:20 -07001469 ext4_fsblk_t logical_sb_block;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001470 unsigned long offset = 0;
1471 unsigned int journal_inum = 0;
1472 unsigned long journal_devnum = 0;
1473 unsigned long def_mount_opts;
1474 struct inode *root;
1475 int blocksize;
1476 int hblock;
1477 int db_count;
1478 int i;
1479 int needs_recovery;
1480 __le32 features;
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001481 __u64 blocks_count;
Peter Zijlstra833f4072007-10-16 23:25:45 -07001482 int err;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001483
1484 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1485 if (!sbi)
1486 return -ENOMEM;
1487 sb->s_fs_info = sbi;
1488 sbi->s_mount_opt = 0;
Mingming Cao617ba132006-10-11 01:20:53 -07001489 sbi->s_resuid = EXT4_DEF_RESUID;
1490 sbi->s_resgid = EXT4_DEF_RESGID;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001491
1492 unlock_kernel();
1493
Mingming Cao617ba132006-10-11 01:20:53 -07001494 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001495 if (!blocksize) {
Mingming Cao617ba132006-10-11 01:20:53 -07001496 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001497 goto out_fail;
1498 }
1499
1500 /*
Mingming Cao617ba132006-10-11 01:20:53 -07001501 * The ext4 superblock will not be buffer aligned for other than 1kB
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001502 * block sizes. We need to calculate the offset from buffer start.
1503 */
Mingming Cao617ba132006-10-11 01:20:53 -07001504 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
Andrew Morton70bbb3e2006-10-11 01:21:20 -07001505 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1506 offset = do_div(logical_sb_block, blocksize);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001507 } else {
Andrew Morton70bbb3e2006-10-11 01:21:20 -07001508 logical_sb_block = sb_block;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001509 }
1510
Andrew Morton70bbb3e2006-10-11 01:21:20 -07001511 if (!(bh = sb_bread(sb, logical_sb_block))) {
Mingming Cao617ba132006-10-11 01:20:53 -07001512 printk (KERN_ERR "EXT4-fs: unable to read superblock\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001513 goto out_fail;
1514 }
1515 /*
1516 * Note: s_es must be initialized as soon as possible because
Mingming Cao617ba132006-10-11 01:20:53 -07001517 * some ext4 macro-instructions depend on its value
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001518 */
Mingming Cao617ba132006-10-11 01:20:53 -07001519 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001520 sbi->s_es = es;
1521 sb->s_magic = le16_to_cpu(es->s_magic);
Mingming Cao617ba132006-10-11 01:20:53 -07001522 if (sb->s_magic != EXT4_SUPER_MAGIC)
1523 goto cantfind_ext4;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001524
1525 /* Set defaults before we parse the mount options */
1526 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
Mingming Cao617ba132006-10-11 01:20:53 -07001527 if (def_mount_opts & EXT4_DEFM_DEBUG)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001528 set_opt(sbi->s_mount_opt, DEBUG);
Mingming Cao617ba132006-10-11 01:20:53 -07001529 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001530 set_opt(sbi->s_mount_opt, GRPID);
Mingming Cao617ba132006-10-11 01:20:53 -07001531 if (def_mount_opts & EXT4_DEFM_UID16)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001532 set_opt(sbi->s_mount_opt, NO_UID32);
Hugh Dickins2e7842b2007-02-10 01:46:13 -08001533#ifdef CONFIG_EXT4DEV_FS_XATTR
Mingming Cao617ba132006-10-11 01:20:53 -07001534 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001535 set_opt(sbi->s_mount_opt, XATTR_USER);
Hugh Dickins2e7842b2007-02-10 01:46:13 -08001536#endif
1537#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
Mingming Cao617ba132006-10-11 01:20:53 -07001538 if (def_mount_opts & EXT4_DEFM_ACL)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001539 set_opt(sbi->s_mount_opt, POSIX_ACL);
Hugh Dickins2e7842b2007-02-10 01:46:13 -08001540#endif
Mingming Cao617ba132006-10-11 01:20:53 -07001541 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
1542 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
1543 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
1544 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
1545 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
1546 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001547
Mingming Cao617ba132006-10-11 01:20:53 -07001548 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001549 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
Mingming Cao617ba132006-10-11 01:20:53 -07001550 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_RO)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001551 set_opt(sbi->s_mount_opt, ERRORS_RO);
Dmitry Mishinceea16b2006-10-11 01:21:21 -07001552 else
1553 set_opt(sbi->s_mount_opt, ERRORS_CONT);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001554
1555 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1556 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1557
1558 set_opt(sbi->s_mount_opt, RESERVATION);
1559
Mingming Cao1e2462f2007-07-18 09:00:55 -04001560 /*
1561 * turn on extents feature by default in ext4 filesystem
1562 * User -o noextents to turn it off
1563 */
1564 set_opt(sbi->s_mount_opt, EXTENTS);
1565
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001566 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1567 NULL, 0))
1568 goto failed_mount;
1569
1570 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
Mingming Cao617ba132006-10-11 01:20:53 -07001571 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001572
Mingming Cao617ba132006-10-11 01:20:53 -07001573 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
1574 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
1575 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1576 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001577 printk(KERN_WARNING
Mingming Cao617ba132006-10-11 01:20:53 -07001578 "EXT4-fs warning: feature flags set on rev 0 fs, "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001579 "running e2fsck is recommended\n");
1580 /*
1581 * Check feature flags regardless of the revision level, since we
1582 * previously didn't change the revision level when setting the flags,
1583 * so there is a chance incompat flags are set on a rev 0 filesystem.
1584 */
Mingming Cao617ba132006-10-11 01:20:53 -07001585 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001586 if (features) {
Mingming Cao617ba132006-10-11 01:20:53 -07001587 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001588 "unsupported optional features (%x).\n",
1589 sb->s_id, le32_to_cpu(features));
1590 goto failed_mount;
1591 }
Mingming Cao617ba132006-10-11 01:20:53 -07001592 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001593 if (!(sb->s_flags & MS_RDONLY) && features) {
Mingming Cao617ba132006-10-11 01:20:53 -07001594 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001595 "unsupported optional features (%x).\n",
1596 sb->s_id, le32_to_cpu(features));
1597 goto failed_mount;
1598 }
1599 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1600
Mingming Cao617ba132006-10-11 01:20:53 -07001601 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
1602 blocksize > EXT4_MAX_BLOCK_SIZE) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001603 printk(KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001604 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001605 blocksize, sb->s_id);
1606 goto failed_mount;
1607 }
1608
1609 hblock = bdev_hardsect_size(sb->s_bdev);
1610 if (sb->s_blocksize != blocksize) {
1611 /*
1612 * Make sure the blocksize for the filesystem is larger
1613 * than the hardware sectorsize for the machine.
1614 */
1615 if (blocksize < hblock) {
Mingming Cao617ba132006-10-11 01:20:53 -07001616 printk(KERN_ERR "EXT4-fs: blocksize %d too small for "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001617 "device blocksize %d.\n", blocksize, hblock);
1618 goto failed_mount;
1619 }
1620
1621 brelse (bh);
1622 sb_set_blocksize(sb, blocksize);
Andrew Morton70bbb3e2006-10-11 01:21:20 -07001623 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1624 offset = do_div(logical_sb_block, blocksize);
1625 bh = sb_bread(sb, logical_sb_block);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001626 if (!bh) {
1627 printk(KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001628 "EXT4-fs: Can't read superblock on 2nd try.\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001629 goto failed_mount;
1630 }
Mingming Cao617ba132006-10-11 01:20:53 -07001631 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001632 sbi->s_es = es;
Mingming Cao617ba132006-10-11 01:20:53 -07001633 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001634 printk (KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001635 "EXT4-fs: Magic mismatch, very weird !\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001636 goto failed_mount;
1637 }
1638 }
1639
Mingming Cao617ba132006-10-11 01:20:53 -07001640 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001641
Mingming Cao617ba132006-10-11 01:20:53 -07001642 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
1643 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
1644 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001645 } else {
1646 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1647 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
Mingming Cao617ba132006-10-11 01:20:53 -07001648 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
Vignesh Babu13305932007-07-18 09:11:02 -04001649 (!is_power_of_2(sbi->s_inode_size)) ||
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001650 (sbi->s_inode_size > blocksize)) {
1651 printk (KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001652 "EXT4-fs: unsupported inode size: %d\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001653 sbi->s_inode_size);
1654 goto failed_mount;
1655 }
Kalpak Shahef7f3832007-07-18 09:15:20 -04001656 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
1657 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001658 }
Mingming Cao617ba132006-10-11 01:20:53 -07001659 sbi->s_frag_size = EXT4_MIN_FRAG_SIZE <<
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001660 le32_to_cpu(es->s_log_frag_size);
1661 if (blocksize != sbi->s_frag_size) {
1662 printk(KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001663 "EXT4-fs: fragsize %lu != blocksize %u (unsupported)\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001664 sbi->s_frag_size, blocksize);
1665 goto failed_mount;
1666 }
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07001667 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
1668 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07001669 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07001670 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
1671 sbi->s_desc_size & (sbi->s_desc_size - 1)) {
1672 printk(KERN_ERR
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07001673 "EXT4-fs: unsupported descriptor size %lu\n",
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07001674 sbi->s_desc_size);
1675 goto failed_mount;
1676 }
1677 } else
1678 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001679 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1680 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1681 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
Mingming Cao617ba132006-10-11 01:20:53 -07001682 if (EXT4_INODE_SIZE(sb) == 0)
1683 goto cantfind_ext4;
1684 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001685 if (sbi->s_inodes_per_block == 0)
Mingming Cao617ba132006-10-11 01:20:53 -07001686 goto cantfind_ext4;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001687 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1688 sbi->s_inodes_per_block;
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07001689 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001690 sbi->s_sbh = bh;
1691 sbi->s_mount_state = le16_to_cpu(es->s_state);
Mingming Cao617ba132006-10-11 01:20:53 -07001692 sbi->s_addr_per_block_bits = log2(EXT4_ADDR_PER_BLOCK(sb));
1693 sbi->s_desc_per_block_bits = log2(EXT4_DESC_PER_BLOCK(sb));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001694 for (i=0; i < 4; i++)
1695 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1696 sbi->s_def_hash_version = es->s_def_hash_version;
1697
1698 if (sbi->s_blocks_per_group > blocksize * 8) {
1699 printk (KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001700 "EXT4-fs: #blocks per group too big: %lu\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001701 sbi->s_blocks_per_group);
1702 goto failed_mount;
1703 }
1704 if (sbi->s_frags_per_group > blocksize * 8) {
1705 printk (KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001706 "EXT4-fs: #fragments per group too big: %lu\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001707 sbi->s_frags_per_group);
1708 goto failed_mount;
1709 }
1710 if (sbi->s_inodes_per_group > blocksize * 8) {
1711 printk (KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001712 "EXT4-fs: #inodes per group too big: %lu\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001713 sbi->s_inodes_per_group);
1714 goto failed_mount;
1715 }
1716
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001717 if (ext4_blocks_count(es) >
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001718 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
Mingming Cao617ba132006-10-11 01:20:53 -07001719 printk(KERN_ERR "EXT4-fs: filesystem on %s:"
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001720 " too large to mount safely\n", sb->s_id);
1721 if (sizeof(sector_t) < 8)
Mingming Cao617ba132006-10-11 01:20:53 -07001722 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001723 "enabled\n");
1724 goto failed_mount;
1725 }
1726
Mingming Cao617ba132006-10-11 01:20:53 -07001727 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
1728 goto cantfind_ext4;
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001729 blocks_count = (ext4_blocks_count(es) -
1730 le32_to_cpu(es->s_first_data_block) +
1731 EXT4_BLOCKS_PER_GROUP(sb) - 1);
1732 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
1733 sbi->s_groups_count = blocks_count;
Mingming Cao617ba132006-10-11 01:20:53 -07001734 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
1735 EXT4_DESC_PER_BLOCK(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001736 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1737 GFP_KERNEL);
1738 if (sbi->s_group_desc == NULL) {
Mingming Cao617ba132006-10-11 01:20:53 -07001739 printk (KERN_ERR "EXT4-fs: not enough memory\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001740 goto failed_mount;
1741 }
1742
1743 bgl_lock_init(&sbi->s_blockgroup_lock);
1744
1745 for (i = 0; i < db_count; i++) {
Andrew Morton70bbb3e2006-10-11 01:21:20 -07001746 block = descriptor_loc(sb, logical_sb_block, i);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001747 sbi->s_group_desc[i] = sb_bread(sb, block);
1748 if (!sbi->s_group_desc[i]) {
Mingming Cao617ba132006-10-11 01:20:53 -07001749 printk (KERN_ERR "EXT4-fs: "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001750 "can't read group descriptor %d\n", i);
1751 db_count = i;
1752 goto failed_mount2;
1753 }
1754 }
Mingming Cao617ba132006-10-11 01:20:53 -07001755 if (!ext4_check_descriptors (sb)) {
1756 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001757 goto failed_mount2;
1758 }
1759 sbi->s_gdb_count = db_count;
1760 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1761 spin_lock_init(&sbi->s_next_gen_lock);
1762
Peter Zijlstra833f4072007-10-16 23:25:45 -07001763 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1764 ext4_count_free_blocks(sb));
1765 if (!err) {
1766 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1767 ext4_count_free_inodes(sb));
1768 }
1769 if (!err) {
1770 err = percpu_counter_init(&sbi->s_dirs_counter,
1771 ext4_count_dirs(sb));
1772 }
1773 if (err) {
1774 printk(KERN_ERR "EXT4-fs: insufficient memory\n");
1775 goto failed_mount3;
1776 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001777
1778 /* per fileystem reservation list head & lock */
1779 spin_lock_init(&sbi->s_rsv_window_lock);
1780 sbi->s_rsv_window_root = RB_ROOT;
1781 /* Add a single, static dummy reservation to the start of the
1782 * reservation window list --- it gives us a placeholder for
1783 * append-at-start-of-list which makes the allocation logic
1784 * _much_ simpler. */
Mingming Cao617ba132006-10-11 01:20:53 -07001785 sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
1786 sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001787 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1788 sbi->s_rsv_window_head.rsv_goal_size = 0;
Mingming Cao617ba132006-10-11 01:20:53 -07001789 ext4_rsv_window_add(sb, &sbi->s_rsv_window_head);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001790
1791 /*
1792 * set up enough so that it can read an inode
1793 */
Mingming Cao617ba132006-10-11 01:20:53 -07001794 sb->s_op = &ext4_sops;
1795 sb->s_export_op = &ext4_export_ops;
1796 sb->s_xattr = ext4_xattr_handlers;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001797#ifdef CONFIG_QUOTA
Mingming Cao617ba132006-10-11 01:20:53 -07001798 sb->s_qcop = &ext4_qctl_operations;
1799 sb->dq_op = &ext4_quota_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001800#endif
1801 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1802
1803 sb->s_root = NULL;
1804
1805 needs_recovery = (es->s_last_orphan != 0 ||
Mingming Cao617ba132006-10-11 01:20:53 -07001806 EXT4_HAS_INCOMPAT_FEATURE(sb,
1807 EXT4_FEATURE_INCOMPAT_RECOVER));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001808
1809 /*
1810 * The first inode we look at is the journal inode. Don't try
1811 * root first: it may be modified in the journal!
1812 */
1813 if (!test_opt(sb, NOLOAD) &&
Mingming Cao617ba132006-10-11 01:20:53 -07001814 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
1815 if (ext4_load_journal(sb, es, journal_devnum))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001816 goto failed_mount3;
1817 } else if (journal_inum) {
Mingming Cao617ba132006-10-11 01:20:53 -07001818 if (ext4_create_journal(sb, es, journal_inum))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001819 goto failed_mount3;
1820 } else {
1821 if (!silent)
1822 printk (KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001823 "ext4: No journal on filesystem on %s\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001824 sb->s_id);
1825 goto failed_mount3;
1826 }
1827
Jose R. Santoseb40a092007-07-18 08:37:25 -04001828 if (ext4_blocks_count(es) > 0xffffffffULL &&
1829 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
1830 JBD2_FEATURE_INCOMPAT_64BIT)) {
1831 printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n");
1832 goto failed_mount4;
1833 }
1834
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001835 /* We have now updated the journal if required, so we can
1836 * validate the data journaling mode. */
1837 switch (test_opt(sb, DATA_FLAGS)) {
1838 case 0:
1839 /* No mode set, assume a default based on the journal
Andrew Morton63f57932006-10-11 01:21:24 -07001840 * capabilities: ORDERED_DATA if the journal can
1841 * cope, else JOURNAL_DATA
1842 */
Mingming Caodab291a2006-10-11 01:21:01 -07001843 if (jbd2_journal_check_available_features
1844 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001845 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1846 else
1847 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1848 break;
1849
Mingming Cao617ba132006-10-11 01:20:53 -07001850 case EXT4_MOUNT_ORDERED_DATA:
1851 case EXT4_MOUNT_WRITEBACK_DATA:
Mingming Caodab291a2006-10-11 01:21:01 -07001852 if (!jbd2_journal_check_available_features
1853 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
Mingming Cao617ba132006-10-11 01:20:53 -07001854 printk(KERN_ERR "EXT4-fs: Journal does not support "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001855 "requested data journaling mode\n");
1856 goto failed_mount4;
1857 }
1858 default:
1859 break;
1860 }
1861
1862 if (test_opt(sb, NOBH)) {
Mingming Cao617ba132006-10-11 01:20:53 -07001863 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
1864 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001865 "its supported only with writeback mode\n");
1866 clear_opt(sbi->s_mount_opt, NOBH);
1867 }
1868 }
1869 /*
Mingming Caodab291a2006-10-11 01:21:01 -07001870 * The jbd2_journal_load will have done any necessary log recovery,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001871 * so we can safely mount the rest of the filesystem now.
1872 */
1873
Mingming Cao617ba132006-10-11 01:20:53 -07001874 root = iget(sb, EXT4_ROOT_INO);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001875 sb->s_root = d_alloc_root(root);
1876 if (!sb->s_root) {
Mingming Cao617ba132006-10-11 01:20:53 -07001877 printk(KERN_ERR "EXT4-fs: get root inode failed\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001878 iput(root);
1879 goto failed_mount4;
1880 }
1881 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1882 dput(sb->s_root);
1883 sb->s_root = NULL;
Mingming Cao617ba132006-10-11 01:20:53 -07001884 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001885 goto failed_mount4;
1886 }
1887
Mingming Cao617ba132006-10-11 01:20:53 -07001888 ext4_setup_super (sb, es, sb->s_flags & MS_RDONLY);
Kalpak Shahef7f3832007-07-18 09:15:20 -04001889
1890 /* determine the minimum size of new large inodes, if present */
1891 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
1892 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
1893 EXT4_GOOD_OLD_INODE_SIZE;
1894 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
1895 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
1896 if (sbi->s_want_extra_isize <
1897 le16_to_cpu(es->s_want_extra_isize))
1898 sbi->s_want_extra_isize =
1899 le16_to_cpu(es->s_want_extra_isize);
1900 if (sbi->s_want_extra_isize <
1901 le16_to_cpu(es->s_min_extra_isize))
1902 sbi->s_want_extra_isize =
1903 le16_to_cpu(es->s_min_extra_isize);
1904 }
1905 }
1906 /* Check if enough inode space is available */
1907 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
1908 sbi->s_inode_size) {
1909 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
1910 EXT4_GOOD_OLD_INODE_SIZE;
1911 printk(KERN_INFO "EXT4-fs: required extra inode space not"
1912 "available.\n");
1913 }
1914
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001915 /*
1916 * akpm: core read_super() calls in here with the superblock locked.
1917 * That deadlocks, because orphan cleanup needs to lock the superblock
1918 * in numerous places. Here we just pop the lock - it's relatively
1919 * harmless, because we are now ready to accept write_super() requests,
1920 * and aviro says that's the only reason for hanging onto the
1921 * superblock lock.
1922 */
Mingming Cao617ba132006-10-11 01:20:53 -07001923 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
1924 ext4_orphan_cleanup(sb, es);
1925 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001926 if (needs_recovery)
Mingming Cao617ba132006-10-11 01:20:53 -07001927 printk (KERN_INFO "EXT4-fs: recovery complete.\n");
1928 ext4_mark_recovery_complete(sb, es);
1929 printk (KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n",
1930 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal":
1931 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered":
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001932 "writeback");
1933
Alex Tomasa86c6182006-10-11 01:21:03 -07001934 ext4_ext_init(sb);
1935
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001936 lock_kernel();
1937 return 0;
1938
Mingming Cao617ba132006-10-11 01:20:53 -07001939cantfind_ext4:
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001940 if (!silent)
Mingming Cao617ba132006-10-11 01:20:53 -07001941 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001942 sb->s_id);
1943 goto failed_mount;
1944
1945failed_mount4:
Mingming Caodab291a2006-10-11 01:21:01 -07001946 jbd2_journal_destroy(sbi->s_journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001947failed_mount3:
1948 percpu_counter_destroy(&sbi->s_freeblocks_counter);
1949 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1950 percpu_counter_destroy(&sbi->s_dirs_counter);
1951failed_mount2:
1952 for (i = 0; i < db_count; i++)
1953 brelse(sbi->s_group_desc[i]);
1954 kfree(sbi->s_group_desc);
1955failed_mount:
1956#ifdef CONFIG_QUOTA
1957 for (i = 0; i < MAXQUOTAS; i++)
1958 kfree(sbi->s_qf_names[i]);
1959#endif
Mingming Cao617ba132006-10-11 01:20:53 -07001960 ext4_blkdev_remove(sbi);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001961 brelse(bh);
1962out_fail:
1963 sb->s_fs_info = NULL;
1964 kfree(sbi);
1965 lock_kernel();
1966 return -EINVAL;
1967}
1968
1969/*
1970 * Setup any per-fs journal parameters now. We'll do this both on
1971 * initial mount, once the journal has been initialised but before we've
1972 * done any recovery; and again on any subsequent remount.
1973 */
Mingming Cao617ba132006-10-11 01:20:53 -07001974static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001975{
Mingming Cao617ba132006-10-11 01:20:53 -07001976 struct ext4_sb_info *sbi = EXT4_SB(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001977
1978 if (sbi->s_commit_interval)
1979 journal->j_commit_interval = sbi->s_commit_interval;
Mingming Cao617ba132006-10-11 01:20:53 -07001980 /* We could also set up an ext4-specific default for the commit
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001981 * interval here, but for now we'll just fall back to the jbd
1982 * default. */
1983
1984 spin_lock(&journal->j_state_lock);
1985 if (test_opt(sb, BARRIER))
Mingming Caodab291a2006-10-11 01:21:01 -07001986 journal->j_flags |= JBD2_BARRIER;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001987 else
Mingming Caodab291a2006-10-11 01:21:01 -07001988 journal->j_flags &= ~JBD2_BARRIER;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001989 spin_unlock(&journal->j_state_lock);
1990}
1991
Mingming Cao617ba132006-10-11 01:20:53 -07001992static journal_t *ext4_get_journal(struct super_block *sb,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001993 unsigned int journal_inum)
1994{
1995 struct inode *journal_inode;
1996 journal_t *journal;
1997
1998 /* First, test for the existence of a valid inode on disk. Bad
1999 * things happen if we iget() an unused inode, as the subsequent
2000 * iput() will try to delete it. */
2001
2002 journal_inode = iget(sb, journal_inum);
2003 if (!journal_inode) {
Mingming Cao617ba132006-10-11 01:20:53 -07002004 printk(KERN_ERR "EXT4-fs: no journal found.\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002005 return NULL;
2006 }
2007 if (!journal_inode->i_nlink) {
2008 make_bad_inode(journal_inode);
2009 iput(journal_inode);
Mingming Cao617ba132006-10-11 01:20:53 -07002010 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002011 return NULL;
2012 }
2013
2014 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2015 journal_inode, journal_inode->i_size);
2016 if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
Mingming Cao617ba132006-10-11 01:20:53 -07002017 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002018 iput(journal_inode);
2019 return NULL;
2020 }
2021
Mingming Caodab291a2006-10-11 01:21:01 -07002022 journal = jbd2_journal_init_inode(journal_inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002023 if (!journal) {
Mingming Cao617ba132006-10-11 01:20:53 -07002024 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002025 iput(journal_inode);
2026 return NULL;
2027 }
2028 journal->j_private = sb;
Mingming Cao617ba132006-10-11 01:20:53 -07002029 ext4_init_journal_params(sb, journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002030 return journal;
2031}
2032
Mingming Cao617ba132006-10-11 01:20:53 -07002033static journal_t *ext4_get_dev_journal(struct super_block *sb,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002034 dev_t j_dev)
2035{
2036 struct buffer_head * bh;
2037 journal_t *journal;
Mingming Cao617ba132006-10-11 01:20:53 -07002038 ext4_fsblk_t start;
2039 ext4_fsblk_t len;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002040 int hblock, blocksize;
Mingming Cao617ba132006-10-11 01:20:53 -07002041 ext4_fsblk_t sb_block;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002042 unsigned long offset;
Mingming Cao617ba132006-10-11 01:20:53 -07002043 struct ext4_super_block * es;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002044 struct block_device *bdev;
2045
Mingming Cao617ba132006-10-11 01:20:53 -07002046 bdev = ext4_blkdev_get(j_dev);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002047 if (bdev == NULL)
2048 return NULL;
2049
2050 if (bd_claim(bdev, sb)) {
2051 printk(KERN_ERR
Dave Kleikamp8c55e202007-05-24 13:04:54 -04002052 "EXT4: failed to claim external journal device.\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002053 blkdev_put(bdev);
2054 return NULL;
2055 }
2056
2057 blocksize = sb->s_blocksize;
2058 hblock = bdev_hardsect_size(bdev);
2059 if (blocksize < hblock) {
2060 printk(KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07002061 "EXT4-fs: blocksize too small for journal device.\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002062 goto out_bdev;
2063 }
2064
Mingming Cao617ba132006-10-11 01:20:53 -07002065 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
2066 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002067 set_blocksize(bdev, blocksize);
2068 if (!(bh = __bread(bdev, sb_block, blocksize))) {
Mingming Cao617ba132006-10-11 01:20:53 -07002069 printk(KERN_ERR "EXT4-fs: couldn't read superblock of "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002070 "external journal\n");
2071 goto out_bdev;
2072 }
2073
Mingming Cao617ba132006-10-11 01:20:53 -07002074 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2075 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002076 !(le32_to_cpu(es->s_feature_incompat) &
Mingming Cao617ba132006-10-11 01:20:53 -07002077 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2078 printk(KERN_ERR "EXT4-fs: external journal has "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002079 "bad superblock\n");
2080 brelse(bh);
2081 goto out_bdev;
2082 }
2083
Mingming Cao617ba132006-10-11 01:20:53 -07002084 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2085 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002086 brelse(bh);
2087 goto out_bdev;
2088 }
2089
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002090 len = ext4_blocks_count(es);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002091 start = sb_block + 1;
2092 brelse(bh); /* we're done with the superblock */
2093
Mingming Caodab291a2006-10-11 01:21:01 -07002094 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002095 start, len, blocksize);
2096 if (!journal) {
Mingming Cao617ba132006-10-11 01:20:53 -07002097 printk(KERN_ERR "EXT4-fs: failed to create device journal\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002098 goto out_bdev;
2099 }
2100 journal->j_private = sb;
2101 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2102 wait_on_buffer(journal->j_sb_buffer);
2103 if (!buffer_uptodate(journal->j_sb_buffer)) {
Mingming Cao617ba132006-10-11 01:20:53 -07002104 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002105 goto out_journal;
2106 }
2107 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
Mingming Cao617ba132006-10-11 01:20:53 -07002108 printk(KERN_ERR "EXT4-fs: External journal has more than one "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002109 "user (unsupported) - %d\n",
2110 be32_to_cpu(journal->j_superblock->s_nr_users));
2111 goto out_journal;
2112 }
Mingming Cao617ba132006-10-11 01:20:53 -07002113 EXT4_SB(sb)->journal_bdev = bdev;
2114 ext4_init_journal_params(sb, journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002115 return journal;
2116out_journal:
Mingming Caodab291a2006-10-11 01:21:01 -07002117 jbd2_journal_destroy(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002118out_bdev:
Mingming Cao617ba132006-10-11 01:20:53 -07002119 ext4_blkdev_put(bdev);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002120 return NULL;
2121}
2122
Mingming Cao617ba132006-10-11 01:20:53 -07002123static int ext4_load_journal(struct super_block *sb,
2124 struct ext4_super_block *es,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002125 unsigned long journal_devnum)
2126{
2127 journal_t *journal;
2128 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2129 dev_t journal_dev;
2130 int err = 0;
2131 int really_read_only;
2132
2133 if (journal_devnum &&
2134 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
Mingming Cao617ba132006-10-11 01:20:53 -07002135 printk(KERN_INFO "EXT4-fs: external journal device major/minor "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002136 "numbers have changed\n");
2137 journal_dev = new_decode_dev(journal_devnum);
2138 } else
2139 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2140
2141 really_read_only = bdev_read_only(sb->s_bdev);
2142
2143 /*
2144 * Are we loading a blank journal or performing recovery after a
2145 * crash? For recovery, we need to check in advance whether we
2146 * can get read-write access to the device.
2147 */
2148
Mingming Cao617ba132006-10-11 01:20:53 -07002149 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002150 if (sb->s_flags & MS_RDONLY) {
Mingming Cao617ba132006-10-11 01:20:53 -07002151 printk(KERN_INFO "EXT4-fs: INFO: recovery "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002152 "required on readonly filesystem.\n");
2153 if (really_read_only) {
Mingming Cao617ba132006-10-11 01:20:53 -07002154 printk(KERN_ERR "EXT4-fs: write access "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002155 "unavailable, cannot proceed.\n");
2156 return -EROFS;
2157 }
Mingming Cao617ba132006-10-11 01:20:53 -07002158 printk (KERN_INFO "EXT4-fs: write access will "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002159 "be enabled during recovery.\n");
2160 }
2161 }
2162
2163 if (journal_inum && journal_dev) {
Mingming Cao617ba132006-10-11 01:20:53 -07002164 printk(KERN_ERR "EXT4-fs: filesystem has both journal "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002165 "and inode journals!\n");
2166 return -EINVAL;
2167 }
2168
2169 if (journal_inum) {
Mingming Cao617ba132006-10-11 01:20:53 -07002170 if (!(journal = ext4_get_journal(sb, journal_inum)))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002171 return -EINVAL;
2172 } else {
Mingming Cao617ba132006-10-11 01:20:53 -07002173 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002174 return -EINVAL;
2175 }
2176
2177 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
Mingming Caodab291a2006-10-11 01:21:01 -07002178 err = jbd2_journal_update_format(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002179 if (err) {
Mingming Cao617ba132006-10-11 01:20:53 -07002180 printk(KERN_ERR "EXT4-fs: error updating journal.\n");
Mingming Caodab291a2006-10-11 01:21:01 -07002181 jbd2_journal_destroy(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002182 return err;
2183 }
2184 }
2185
Mingming Cao617ba132006-10-11 01:20:53 -07002186 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
Mingming Caodab291a2006-10-11 01:21:01 -07002187 err = jbd2_journal_wipe(journal, !really_read_only);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002188 if (!err)
Mingming Caodab291a2006-10-11 01:21:01 -07002189 err = jbd2_journal_load(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002190
2191 if (err) {
Mingming Cao617ba132006-10-11 01:20:53 -07002192 printk(KERN_ERR "EXT4-fs: error loading journal.\n");
Mingming Caodab291a2006-10-11 01:21:01 -07002193 jbd2_journal_destroy(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002194 return err;
2195 }
2196
Mingming Cao617ba132006-10-11 01:20:53 -07002197 EXT4_SB(sb)->s_journal = journal;
2198 ext4_clear_journal_err(sb, es);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002199
2200 if (journal_devnum &&
2201 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2202 es->s_journal_dev = cpu_to_le32(journal_devnum);
2203 sb->s_dirt = 1;
2204
2205 /* Make sure we flush the recovery flag to disk. */
Mingming Cao617ba132006-10-11 01:20:53 -07002206 ext4_commit_super(sb, es, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002207 }
2208
2209 return 0;
2210}
2211
Mingming Cao617ba132006-10-11 01:20:53 -07002212static int ext4_create_journal(struct super_block * sb,
2213 struct ext4_super_block * es,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002214 unsigned int journal_inum)
2215{
2216 journal_t *journal;
Borislav Petkov6c675bd2007-07-15 23:41:45 -07002217 int err;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002218
2219 if (sb->s_flags & MS_RDONLY) {
Mingming Cao617ba132006-10-11 01:20:53 -07002220 printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002221 "create journal.\n");
2222 return -EROFS;
2223 }
2224
Borislav Petkov6c675bd2007-07-15 23:41:45 -07002225 journal = ext4_get_journal(sb, journal_inum);
2226 if (!journal)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002227 return -EINVAL;
2228
Mingming Cao617ba132006-10-11 01:20:53 -07002229 printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002230 journal_inum);
2231
Borislav Petkov6c675bd2007-07-15 23:41:45 -07002232 err = jbd2_journal_create(journal);
2233 if (err) {
Mingming Cao617ba132006-10-11 01:20:53 -07002234 printk(KERN_ERR "EXT4-fs: error creating journal.\n");
Mingming Caodab291a2006-10-11 01:21:01 -07002235 jbd2_journal_destroy(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002236 return -EIO;
2237 }
2238
Mingming Cao617ba132006-10-11 01:20:53 -07002239 EXT4_SB(sb)->s_journal = journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002240
Mingming Cao617ba132006-10-11 01:20:53 -07002241 ext4_update_dynamic_rev(sb);
2242 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2243 EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002244
2245 es->s_journal_inum = cpu_to_le32(journal_inum);
2246 sb->s_dirt = 1;
2247
2248 /* Make sure we flush the recovery flag to disk. */
Mingming Cao617ba132006-10-11 01:20:53 -07002249 ext4_commit_super(sb, es, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002250
2251 return 0;
2252}
2253
Mingming Cao617ba132006-10-11 01:20:53 -07002254static void ext4_commit_super (struct super_block * sb,
2255 struct ext4_super_block * es,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002256 int sync)
2257{
Mingming Cao617ba132006-10-11 01:20:53 -07002258 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002259
2260 if (!sbh)
2261 return;
2262 es->s_wtime = cpu_to_le32(get_seconds());
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002263 ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb));
Mingming Cao617ba132006-10-11 01:20:53 -07002264 es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002265 BUFFER_TRACE(sbh, "marking dirty");
2266 mark_buffer_dirty(sbh);
2267 if (sync)
2268 sync_dirty_buffer(sbh);
2269}
2270
2271
2272/*
2273 * Have we just finished recovery? If so, and if we are mounting (or
2274 * remounting) the filesystem readonly, then we will end up with a
2275 * consistent fs on disk. Record that fact.
2276 */
Mingming Cao617ba132006-10-11 01:20:53 -07002277static void ext4_mark_recovery_complete(struct super_block * sb,
2278 struct ext4_super_block * es)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002279{
Mingming Cao617ba132006-10-11 01:20:53 -07002280 journal_t *journal = EXT4_SB(sb)->s_journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002281
Mingming Caodab291a2006-10-11 01:21:01 -07002282 jbd2_journal_lock_updates(journal);
2283 jbd2_journal_flush(journal);
Jan Kara32c37732007-07-15 23:41:09 -07002284 lock_super(sb);
Mingming Cao617ba132006-10-11 01:20:53 -07002285 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002286 sb->s_flags & MS_RDONLY) {
Mingming Cao617ba132006-10-11 01:20:53 -07002287 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002288 sb->s_dirt = 0;
Mingming Cao617ba132006-10-11 01:20:53 -07002289 ext4_commit_super(sb, es, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002290 }
Jan Kara32c37732007-07-15 23:41:09 -07002291 unlock_super(sb);
Mingming Caodab291a2006-10-11 01:21:01 -07002292 jbd2_journal_unlock_updates(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002293}
2294
2295/*
2296 * If we are mounting (or read-write remounting) a filesystem whose journal
2297 * has recorded an error from a previous lifetime, move that error to the
2298 * main filesystem now.
2299 */
Mingming Cao617ba132006-10-11 01:20:53 -07002300static void ext4_clear_journal_err(struct super_block * sb,
2301 struct ext4_super_block * es)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002302{
2303 journal_t *journal;
2304 int j_errno;
2305 const char *errstr;
2306
Mingming Cao617ba132006-10-11 01:20:53 -07002307 journal = EXT4_SB(sb)->s_journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002308
2309 /*
2310 * Now check for any error status which may have been recorded in the
Mingming Cao617ba132006-10-11 01:20:53 -07002311 * journal by a prior ext4_error() or ext4_abort()
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002312 */
2313
Mingming Caodab291a2006-10-11 01:21:01 -07002314 j_errno = jbd2_journal_errno(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002315 if (j_errno) {
2316 char nbuf[16];
2317
Mingming Cao617ba132006-10-11 01:20:53 -07002318 errstr = ext4_decode_error(sb, j_errno, nbuf);
2319 ext4_warning(sb, __FUNCTION__, "Filesystem error recorded "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002320 "from previous mount: %s", errstr);
Mingming Cao617ba132006-10-11 01:20:53 -07002321 ext4_warning(sb, __FUNCTION__, "Marking fs in need of "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002322 "filesystem check.");
2323
Mingming Cao617ba132006-10-11 01:20:53 -07002324 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2325 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2326 ext4_commit_super (sb, es, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002327
Mingming Caodab291a2006-10-11 01:21:01 -07002328 jbd2_journal_clear_err(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002329 }
2330}
2331
2332/*
2333 * Force the running and committing transactions to commit,
2334 * and wait on the commit.
2335 */
Mingming Cao617ba132006-10-11 01:20:53 -07002336int ext4_force_commit(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002337{
2338 journal_t *journal;
2339 int ret;
2340
2341 if (sb->s_flags & MS_RDONLY)
2342 return 0;
2343
Mingming Cao617ba132006-10-11 01:20:53 -07002344 journal = EXT4_SB(sb)->s_journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002345 sb->s_dirt = 0;
Mingming Cao617ba132006-10-11 01:20:53 -07002346 ret = ext4_journal_force_commit(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002347 return ret;
2348}
2349
2350/*
Mingming Cao617ba132006-10-11 01:20:53 -07002351 * Ext4 always journals updates to the superblock itself, so we don't
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002352 * have to propagate any other updates to the superblock on disk at this
2353 * point. Just start an async writeback to get the buffers on their way
2354 * to the disk.
2355 *
2356 * This implicitly triggers the writebehind on sync().
2357 */
2358
Mingming Cao617ba132006-10-11 01:20:53 -07002359static void ext4_write_super (struct super_block * sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002360{
2361 if (mutex_trylock(&sb->s_lock) != 0)
2362 BUG();
2363 sb->s_dirt = 0;
2364}
2365
Mingming Cao617ba132006-10-11 01:20:53 -07002366static int ext4_sync_fs(struct super_block *sb, int wait)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002367{
2368 tid_t target;
2369
2370 sb->s_dirt = 0;
Mingming Caodab291a2006-10-11 01:21:01 -07002371 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002372 if (wait)
Mingming Caodab291a2006-10-11 01:21:01 -07002373 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002374 }
2375 return 0;
2376}
2377
2378/*
2379 * LVM calls this function before a (read-only) snapshot is created. This
2380 * gives us a chance to flush the journal completely and mark the fs clean.
2381 */
Mingming Cao617ba132006-10-11 01:20:53 -07002382static void ext4_write_super_lockfs(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002383{
2384 sb->s_dirt = 0;
2385
2386 if (!(sb->s_flags & MS_RDONLY)) {
Mingming Cao617ba132006-10-11 01:20:53 -07002387 journal_t *journal = EXT4_SB(sb)->s_journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002388
2389 /* Now we set up the journal barrier. */
Mingming Caodab291a2006-10-11 01:21:01 -07002390 jbd2_journal_lock_updates(journal);
2391 jbd2_journal_flush(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002392
2393 /* Journal blocked and flushed, clear needs_recovery flag. */
Mingming Cao617ba132006-10-11 01:20:53 -07002394 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2395 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002396 }
2397}
2398
2399/*
2400 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2401 * flag here, even though the filesystem is not technically dirty yet.
2402 */
Mingming Cao617ba132006-10-11 01:20:53 -07002403static void ext4_unlockfs(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002404{
2405 if (!(sb->s_flags & MS_RDONLY)) {
2406 lock_super(sb);
2407 /* Reser the needs_recovery flag before the fs is unlocked. */
Mingming Cao617ba132006-10-11 01:20:53 -07002408 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2409 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002410 unlock_super(sb);
Mingming Caodab291a2006-10-11 01:21:01 -07002411 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002412 }
2413}
2414
Mingming Cao617ba132006-10-11 01:20:53 -07002415static int ext4_remount (struct super_block * sb, int * flags, char * data)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002416{
Mingming Cao617ba132006-10-11 01:20:53 -07002417 struct ext4_super_block * es;
2418 struct ext4_sb_info *sbi = EXT4_SB(sb);
2419 ext4_fsblk_t n_blocks_count = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002420 unsigned long old_sb_flags;
Mingming Cao617ba132006-10-11 01:20:53 -07002421 struct ext4_mount_options old_opts;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002422 int err;
2423#ifdef CONFIG_QUOTA
2424 int i;
2425#endif
2426
2427 /* Store the original options */
2428 old_sb_flags = sb->s_flags;
2429 old_opts.s_mount_opt = sbi->s_mount_opt;
2430 old_opts.s_resuid = sbi->s_resuid;
2431 old_opts.s_resgid = sbi->s_resgid;
2432 old_opts.s_commit_interval = sbi->s_commit_interval;
2433#ifdef CONFIG_QUOTA
2434 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2435 for (i = 0; i < MAXQUOTAS; i++)
2436 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2437#endif
2438
2439 /*
2440 * Allow the "check" option to be passed as a remount option.
2441 */
2442 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2443 err = -EINVAL;
2444 goto restore_opts;
2445 }
2446
Mingming Cao617ba132006-10-11 01:20:53 -07002447 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT)
2448 ext4_abort(sb, __FUNCTION__, "Abort forced by user");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002449
2450 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
Mingming Cao617ba132006-10-11 01:20:53 -07002451 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002452
2453 es = sbi->s_es;
2454
Mingming Cao617ba132006-10-11 01:20:53 -07002455 ext4_init_journal_params(sb, sbi->s_journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002456
2457 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002458 n_blocks_count > ext4_blocks_count(es)) {
Mingming Cao617ba132006-10-11 01:20:53 -07002459 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002460 err = -EROFS;
2461 goto restore_opts;
2462 }
2463
2464 if (*flags & MS_RDONLY) {
2465 /*
2466 * First of all, the unconditional stuff we have to do
2467 * to disable replay of the journal when we next remount
2468 */
2469 sb->s_flags |= MS_RDONLY;
2470
2471 /*
2472 * OK, test if we are remounting a valid rw partition
2473 * readonly, and if so set the rdonly flag and then
2474 * mark the partition as valid again.
2475 */
Mingming Cao617ba132006-10-11 01:20:53 -07002476 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
2477 (sbi->s_mount_state & EXT4_VALID_FS))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002478 es->s_state = cpu_to_le16(sbi->s_mount_state);
2479
Jan Kara32c37732007-07-15 23:41:09 -07002480 /*
2481 * We have to unlock super so that we can wait for
2482 * transactions.
2483 */
2484 unlock_super(sb);
Mingming Cao617ba132006-10-11 01:20:53 -07002485 ext4_mark_recovery_complete(sb, es);
Jan Kara32c37732007-07-15 23:41:09 -07002486 lock_super(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002487 } else {
2488 __le32 ret;
Mingming Cao617ba132006-10-11 01:20:53 -07002489 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
2490 ~EXT4_FEATURE_RO_COMPAT_SUPP))) {
2491 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002492 "remount RDWR because of unsupported "
2493 "optional features (%x).\n",
2494 sb->s_id, le32_to_cpu(ret));
2495 err = -EROFS;
2496 goto restore_opts;
2497 }
Eric Sandeenead65962007-02-10 01:46:08 -08002498
2499 /*
2500 * If we have an unprocessed orphan list hanging
2501 * around from a previously readonly bdev mount,
2502 * require a full umount/remount for now.
2503 */
2504 if (es->s_last_orphan) {
2505 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
2506 "remount RDWR because of unprocessed "
2507 "orphan inode list. Please "
2508 "umount/remount instead.\n",
2509 sb->s_id);
2510 err = -EINVAL;
2511 goto restore_opts;
2512 }
2513
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002514 /*
2515 * Mounting a RDONLY partition read-write, so reread
2516 * and store the current valid flag. (It may have
2517 * been changed by e2fsck since we originally mounted
2518 * the partition.)
2519 */
Mingming Cao617ba132006-10-11 01:20:53 -07002520 ext4_clear_journal_err(sb, es);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002521 sbi->s_mount_state = le16_to_cpu(es->s_state);
Mingming Cao617ba132006-10-11 01:20:53 -07002522 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002523 goto restore_opts;
Mingming Cao617ba132006-10-11 01:20:53 -07002524 if (!ext4_setup_super (sb, es, 0))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002525 sb->s_flags &= ~MS_RDONLY;
2526 }
2527 }
2528#ifdef CONFIG_QUOTA
2529 /* Release old quota file names */
2530 for (i = 0; i < MAXQUOTAS; i++)
2531 if (old_opts.s_qf_names[i] &&
2532 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2533 kfree(old_opts.s_qf_names[i]);
2534#endif
2535 return 0;
2536restore_opts:
2537 sb->s_flags = old_sb_flags;
2538 sbi->s_mount_opt = old_opts.s_mount_opt;
2539 sbi->s_resuid = old_opts.s_resuid;
2540 sbi->s_resgid = old_opts.s_resgid;
2541 sbi->s_commit_interval = old_opts.s_commit_interval;
2542#ifdef CONFIG_QUOTA
2543 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2544 for (i = 0; i < MAXQUOTAS; i++) {
2545 if (sbi->s_qf_names[i] &&
2546 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2547 kfree(sbi->s_qf_names[i]);
2548 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2549 }
2550#endif
2551 return err;
2552}
2553
Mingming Cao617ba132006-10-11 01:20:53 -07002554static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002555{
2556 struct super_block *sb = dentry->d_sb;
Mingming Cao617ba132006-10-11 01:20:53 -07002557 struct ext4_sb_info *sbi = EXT4_SB(sb);
2558 struct ext4_super_block *es = sbi->s_es;
Pekka Enberg960cc392006-12-06 20:35:29 -08002559 u64 fsid;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002560
Badari Pulavarty5e700302007-07-15 23:42:00 -07002561 if (test_opt(sb, MINIX_DF)) {
2562 sbi->s_overhead_last = 0;
2563 } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2564 unsigned long ngroups = sbi->s_groups_count, i;
2565 ext4_fsblk_t overhead = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002566 smp_rmb();
2567
2568 /*
Badari Pulavarty5e700302007-07-15 23:42:00 -07002569 * Compute the overhead (FS structures). This is constant
2570 * for a given filesystem unless the number of block groups
2571 * changes so we cache the previous value until it does.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002572 */
2573
2574 /*
2575 * All of the blocks before first_data_block are
2576 * overhead
2577 */
2578 overhead = le32_to_cpu(es->s_first_data_block);
2579
2580 /*
2581 * Add the overhead attributed to the superblock and
2582 * block group descriptors. If the sparse superblocks
2583 * feature is turned on, then not all groups have this.
2584 */
2585 for (i = 0; i < ngroups; i++) {
Mingming Cao617ba132006-10-11 01:20:53 -07002586 overhead += ext4_bg_has_super(sb, i) +
2587 ext4_bg_num_gdb(sb, i);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002588 cond_resched();
2589 }
2590
2591 /*
2592 * Every block group has an inode bitmap, a block
2593 * bitmap, and an inode table.
2594 */
Badari Pulavarty5e700302007-07-15 23:42:00 -07002595 overhead += ngroups * (2 + sbi->s_itb_per_group);
2596 sbi->s_overhead_last = overhead;
2597 smp_wmb();
2598 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002599 }
2600
Mingming Cao617ba132006-10-11 01:20:53 -07002601 buf->f_type = EXT4_SUPER_MAGIC;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002602 buf->f_bsize = sb->s_blocksize;
Badari Pulavarty5e700302007-07-15 23:42:00 -07002603 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
Peter Zijlstra52d9f3b2007-10-16 23:25:44 -07002604 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
Badari Pulavarty5e700302007-07-15 23:42:00 -07002605 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002606 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
2607 if (buf->f_bfree < ext4_r_blocks_count(es))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002608 buf->f_bavail = 0;
2609 buf->f_files = le32_to_cpu(es->s_inodes_count);
Peter Zijlstra52d9f3b2007-10-16 23:25:44 -07002610 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
Badari Pulavarty5e700302007-07-15 23:42:00 -07002611 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
Mingming Cao617ba132006-10-11 01:20:53 -07002612 buf->f_namelen = EXT4_NAME_LEN;
Pekka Enberg960cc392006-12-06 20:35:29 -08002613 fsid = le64_to_cpup((void *)es->s_uuid) ^
2614 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2615 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2616 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002617 return 0;
2618}
2619
2620/* Helper function for writing quotas on sync - we need to start transaction before quota file
2621 * is locked for write. Otherwise the are possible deadlocks:
2622 * Process 1 Process 2
Mingming Cao617ba132006-10-11 01:20:53 -07002623 * ext4_create() quota_sync()
Mingming Caodab291a2006-10-11 01:21:01 -07002624 * jbd2_journal_start() write_dquot()
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002625 * DQUOT_INIT() down(dqio_mutex)
Mingming Caodab291a2006-10-11 01:21:01 -07002626 * down(dqio_mutex) jbd2_journal_start()
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002627 *
2628 */
2629
2630#ifdef CONFIG_QUOTA
2631
2632static inline struct inode *dquot_to_inode(struct dquot *dquot)
2633{
2634 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2635}
2636
Mingming Cao617ba132006-10-11 01:20:53 -07002637static int ext4_dquot_initialize(struct inode *inode, int type)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002638{
2639 handle_t *handle;
2640 int ret, err;
2641
2642 /* We may create quota structure so we need to reserve enough blocks */
Mingming Cao617ba132006-10-11 01:20:53 -07002643 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002644 if (IS_ERR(handle))
2645 return PTR_ERR(handle);
2646 ret = dquot_initialize(inode, type);
Mingming Cao617ba132006-10-11 01:20:53 -07002647 err = ext4_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002648 if (!ret)
2649 ret = err;
2650 return ret;
2651}
2652
Mingming Cao617ba132006-10-11 01:20:53 -07002653static int ext4_dquot_drop(struct inode *inode)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002654{
2655 handle_t *handle;
2656 int ret, err;
2657
2658 /* We may delete quota structure so we need to reserve enough blocks */
Mingming Cao617ba132006-10-11 01:20:53 -07002659 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002660 if (IS_ERR(handle))
2661 return PTR_ERR(handle);
2662 ret = dquot_drop(inode);
Mingming Cao617ba132006-10-11 01:20:53 -07002663 err = ext4_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002664 if (!ret)
2665 ret = err;
2666 return ret;
2667}
2668
Mingming Cao617ba132006-10-11 01:20:53 -07002669static int ext4_write_dquot(struct dquot *dquot)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002670{
2671 int ret, err;
2672 handle_t *handle;
2673 struct inode *inode;
2674
2675 inode = dquot_to_inode(dquot);
Mingming Cao617ba132006-10-11 01:20:53 -07002676 handle = ext4_journal_start(inode,
2677 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002678 if (IS_ERR(handle))
2679 return PTR_ERR(handle);
2680 ret = dquot_commit(dquot);
Mingming Cao617ba132006-10-11 01:20:53 -07002681 err = ext4_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002682 if (!ret)
2683 ret = err;
2684 return ret;
2685}
2686
Mingming Cao617ba132006-10-11 01:20:53 -07002687static int ext4_acquire_dquot(struct dquot *dquot)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002688{
2689 int ret, err;
2690 handle_t *handle;
2691
Mingming Cao617ba132006-10-11 01:20:53 -07002692 handle = ext4_journal_start(dquot_to_inode(dquot),
2693 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002694 if (IS_ERR(handle))
2695 return PTR_ERR(handle);
2696 ret = dquot_acquire(dquot);
Mingming Cao617ba132006-10-11 01:20:53 -07002697 err = ext4_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002698 if (!ret)
2699 ret = err;
2700 return ret;
2701}
2702
Mingming Cao617ba132006-10-11 01:20:53 -07002703static int ext4_release_dquot(struct dquot *dquot)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002704{
2705 int ret, err;
2706 handle_t *handle;
2707
Mingming Cao617ba132006-10-11 01:20:53 -07002708 handle = ext4_journal_start(dquot_to_inode(dquot),
2709 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
Jan Kara9c3013e2007-09-11 15:23:29 -07002710 if (IS_ERR(handle)) {
2711 /* Release dquot anyway to avoid endless cycle in dqput() */
2712 dquot_release(dquot);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002713 return PTR_ERR(handle);
Jan Kara9c3013e2007-09-11 15:23:29 -07002714 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002715 ret = dquot_release(dquot);
Mingming Cao617ba132006-10-11 01:20:53 -07002716 err = ext4_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002717 if (!ret)
2718 ret = err;
2719 return ret;
2720}
2721
Mingming Cao617ba132006-10-11 01:20:53 -07002722static int ext4_mark_dquot_dirty(struct dquot *dquot)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002723{
2724 /* Are we journalling quotas? */
Mingming Cao617ba132006-10-11 01:20:53 -07002725 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2726 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002727 dquot_mark_dquot_dirty(dquot);
Mingming Cao617ba132006-10-11 01:20:53 -07002728 return ext4_write_dquot(dquot);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002729 } else {
2730 return dquot_mark_dquot_dirty(dquot);
2731 }
2732}
2733
Mingming Cao617ba132006-10-11 01:20:53 -07002734static int ext4_write_info(struct super_block *sb, int type)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002735{
2736 int ret, err;
2737 handle_t *handle;
2738
2739 /* Data block + inode block */
Mingming Cao617ba132006-10-11 01:20:53 -07002740 handle = ext4_journal_start(sb->s_root->d_inode, 2);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002741 if (IS_ERR(handle))
2742 return PTR_ERR(handle);
2743 ret = dquot_commit_info(sb, type);
Mingming Cao617ba132006-10-11 01:20:53 -07002744 err = ext4_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002745 if (!ret)
2746 ret = err;
2747 return ret;
2748}
2749
2750/*
2751 * Turn on quotas during mount time - we need to find
2752 * the quota file and such...
2753 */
Mingming Cao617ba132006-10-11 01:20:53 -07002754static int ext4_quota_on_mount(struct super_block *sb, int type)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002755{
Mingming Cao617ba132006-10-11 01:20:53 -07002756 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
2757 EXT4_SB(sb)->s_jquota_fmt, type);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002758}
2759
2760/*
2761 * Standard function to be called on quota_on
2762 */
Mingming Cao617ba132006-10-11 01:20:53 -07002763static int ext4_quota_on(struct super_block *sb, int type, int format_id,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002764 char *path)
2765{
2766 int err;
2767 struct nameidata nd;
2768
2769 if (!test_opt(sb, QUOTA))
2770 return -EINVAL;
2771 /* Not journalling quota? */
Mingming Cao617ba132006-10-11 01:20:53 -07002772 if (!EXT4_SB(sb)->s_qf_names[USRQUOTA] &&
2773 !EXT4_SB(sb)->s_qf_names[GRPQUOTA])
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002774 return vfs_quota_on(sb, type, format_id, path);
2775 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2776 if (err)
2777 return err;
2778 /* Quotafile not on the same filesystem? */
2779 if (nd.mnt->mnt_sb != sb) {
2780 path_release(&nd);
2781 return -EXDEV;
2782 }
2783 /* Quotafile not of fs root? */
2784 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2785 printk(KERN_WARNING
Mingming Cao617ba132006-10-11 01:20:53 -07002786 "EXT4-fs: Quota file not on filesystem root. "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002787 "Journalled quota will not work.\n");
2788 path_release(&nd);
2789 return vfs_quota_on(sb, type, format_id, path);
2790}
2791
2792/* Read data from quotafile - avoid pagecache and such because we cannot afford
2793 * acquiring the locks... As quota files are never truncated and quota code
2794 * itself serializes the operations (and noone else should touch the files)
2795 * we don't have to be afraid of races */
Mingming Cao617ba132006-10-11 01:20:53 -07002796static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002797 size_t len, loff_t off)
2798{
2799 struct inode *inode = sb_dqopt(sb)->files[type];
Mingming Cao617ba132006-10-11 01:20:53 -07002800 sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002801 int err = 0;
2802 int offset = off & (sb->s_blocksize - 1);
2803 int tocopy;
2804 size_t toread;
2805 struct buffer_head *bh;
2806 loff_t i_size = i_size_read(inode);
2807
2808 if (off > i_size)
2809 return 0;
2810 if (off+len > i_size)
2811 len = i_size-off;
2812 toread = len;
2813 while (toread > 0) {
2814 tocopy = sb->s_blocksize - offset < toread ?
2815 sb->s_blocksize - offset : toread;
Mingming Cao617ba132006-10-11 01:20:53 -07002816 bh = ext4_bread(NULL, inode, blk, 0, &err);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002817 if (err)
2818 return err;
2819 if (!bh) /* A hole? */
2820 memset(data, 0, tocopy);
2821 else
2822 memcpy(data, bh->b_data+offset, tocopy);
2823 brelse(bh);
2824 offset = 0;
2825 toread -= tocopy;
2826 data += tocopy;
2827 blk++;
2828 }
2829 return len;
2830}
2831
2832/* Write to quotafile (we know the transaction is already started and has
2833 * enough credits) */
Mingming Cao617ba132006-10-11 01:20:53 -07002834static ssize_t ext4_quota_write(struct super_block *sb, int type,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002835 const char *data, size_t len, loff_t off)
2836{
2837 struct inode *inode = sb_dqopt(sb)->files[type];
Mingming Cao617ba132006-10-11 01:20:53 -07002838 sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002839 int err = 0;
2840 int offset = off & (sb->s_blocksize - 1);
2841 int tocopy;
Mingming Cao617ba132006-10-11 01:20:53 -07002842 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002843 size_t towrite = len;
2844 struct buffer_head *bh;
2845 handle_t *handle = journal_current_handle();
2846
Jan Kara9c3013e2007-09-11 15:23:29 -07002847 if (!handle) {
2848 printk(KERN_WARNING "EXT4-fs: Quota write (off=%Lu, len=%Lu)"
2849 " cancelled because transaction is not started.\n",
2850 (unsigned long long)off, (unsigned long long)len);
2851 return -EIO;
2852 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002853 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2854 while (towrite > 0) {
2855 tocopy = sb->s_blocksize - offset < towrite ?
2856 sb->s_blocksize - offset : towrite;
Mingming Cao617ba132006-10-11 01:20:53 -07002857 bh = ext4_bread(handle, inode, blk, 1, &err);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002858 if (!bh)
2859 goto out;
2860 if (journal_quota) {
Mingming Cao617ba132006-10-11 01:20:53 -07002861 err = ext4_journal_get_write_access(handle, bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002862 if (err) {
2863 brelse(bh);
2864 goto out;
2865 }
2866 }
2867 lock_buffer(bh);
2868 memcpy(bh->b_data+offset, data, tocopy);
2869 flush_dcache_page(bh->b_page);
2870 unlock_buffer(bh);
2871 if (journal_quota)
Mingming Cao617ba132006-10-11 01:20:53 -07002872 err = ext4_journal_dirty_metadata(handle, bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002873 else {
2874 /* Always do at least ordered writes for quotas */
Mingming Cao617ba132006-10-11 01:20:53 -07002875 err = ext4_journal_dirty_data(handle, bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002876 mark_buffer_dirty(bh);
2877 }
2878 brelse(bh);
2879 if (err)
2880 goto out;
2881 offset = 0;
2882 towrite -= tocopy;
2883 data += tocopy;
2884 blk++;
2885 }
2886out:
2887 if (len == towrite)
2888 return err;
2889 if (inode->i_size < off+len-towrite) {
2890 i_size_write(inode, off+len-towrite);
Mingming Cao617ba132006-10-11 01:20:53 -07002891 EXT4_I(inode)->i_disksize = inode->i_size;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002892 }
2893 inode->i_version++;
2894 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
Mingming Cao617ba132006-10-11 01:20:53 -07002895 ext4_mark_inode_dirty(handle, inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002896 mutex_unlock(&inode->i_mutex);
2897 return len - towrite;
2898}
2899
2900#endif
2901
Mingming Cao617ba132006-10-11 01:20:53 -07002902static int ext4_get_sb(struct file_system_type *fs_type,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002903 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
2904{
Mingming Cao617ba132006-10-11 01:20:53 -07002905 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002906}
2907
Mingming Cao617ba132006-10-11 01:20:53 -07002908static struct file_system_type ext4dev_fs_type = {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002909 .owner = THIS_MODULE,
Mingming Cao617ba132006-10-11 01:20:53 -07002910 .name = "ext4dev",
2911 .get_sb = ext4_get_sb,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002912 .kill_sb = kill_block_super,
2913 .fs_flags = FS_REQUIRES_DEV,
2914};
2915
Mingming Cao617ba132006-10-11 01:20:53 -07002916static int __init init_ext4_fs(void)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002917{
Mingming Cao617ba132006-10-11 01:20:53 -07002918 int err = init_ext4_xattr();
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002919 if (err)
2920 return err;
2921 err = init_inodecache();
2922 if (err)
2923 goto out1;
Andrew Morton63f57932006-10-11 01:21:24 -07002924 err = register_filesystem(&ext4dev_fs_type);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002925 if (err)
2926 goto out;
2927 return 0;
2928out:
2929 destroy_inodecache();
2930out1:
Mingming Cao617ba132006-10-11 01:20:53 -07002931 exit_ext4_xattr();
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002932 return err;
2933}
2934
Mingming Cao617ba132006-10-11 01:20:53 -07002935static void __exit exit_ext4_fs(void)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002936{
Mingming Cao617ba132006-10-11 01:20:53 -07002937 unregister_filesystem(&ext4dev_fs_type);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002938 destroy_inodecache();
Mingming Cao617ba132006-10-11 01:20:53 -07002939 exit_ext4_xattr();
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002940}
2941
2942MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
Mingming Cao617ba132006-10-11 01:20:53 -07002943MODULE_DESCRIPTION("Fourth Extended Filesystem with extents");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002944MODULE_LICENSE("GPL");
Mingming Cao617ba132006-10-11 01:20:53 -07002945module_init(init_ext4_fs)
2946module_exit(exit_ext4_fs)