blob: dea8f13c2fd98f3457c50faefd84be2c78399adf [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>
Dave Kleikampac27a0e2006-10-11 01:20:50 -070024#include <linux/slab.h>
25#include <linux/init.h>
26#include <linux/blkdev.h>
27#include <linux/parser.h>
28#include <linux/smp_lock.h>
29#include <linux/buffer_head.h>
Christoph Hellwiga5694252007-07-17 04:04:28 -070030#include <linux/exportfs.h>
Dave Kleikampac27a0e2006-10-11 01:20:50 -070031#include <linux/vfs.h>
32#include <linux/random.h>
33#include <linux/mount.h>
34#include <linux/namei.h>
35#include <linux/quotaops.h>
36#include <linux/seq_file.h>
Theodore Ts'o9f6200b2008-09-23 09:18:24 -040037#include <linux/proc_fs.h>
Theodore Ts'oede86cc2008-10-05 20:50:06 -040038#include <linux/marker.h>
Vignesh Babu13305932007-07-18 09:11:02 -040039#include <linux/log2.h>
Andreas Dilger717d50e2007-10-16 18:38:25 -040040#include <linux/crc16.h>
Dave Kleikampac27a0e2006-10-11 01:20:50 -070041#include <asm/uaccess.h>
42
Christoph Hellwig3dcf5452008-04-29 18:13:32 -040043#include "ext4.h"
44#include "ext4_jbd2.h"
Dave Kleikampac27a0e2006-10-11 01:20:50 -070045#include "xattr.h"
46#include "acl.h"
47#include "namei.h"
Andreas Dilger717d50e2007-10-16 18:38:25 -040048#include "group.h"
Dave Kleikampac27a0e2006-10-11 01:20:50 -070049
Theodore Ts'o9f6200b2008-09-23 09:18:24 -040050struct proc_dir_entry *ext4_proc_root;
51
Mingming Cao617ba132006-10-11 01:20:53 -070052static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
Dave Kleikampac27a0e2006-10-11 01:20:50 -070053 unsigned long journal_devnum);
Mingming Cao617ba132006-10-11 01:20:53 -070054static int ext4_create_journal(struct super_block *, struct ext4_super_block *,
Dave Kleikampac27a0e2006-10-11 01:20:50 -070055 unsigned int);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -040056static void ext4_commit_super(struct super_block *sb,
57 struct ext4_super_block *es, int sync);
58static void ext4_mark_recovery_complete(struct super_block *sb,
59 struct ext4_super_block *es);
60static void ext4_clear_journal_err(struct super_block *sb,
61 struct ext4_super_block *es);
Mingming Cao617ba132006-10-11 01:20:53 -070062static int ext4_sync_fs(struct super_block *sb, int wait);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -040063static const char *ext4_decode_error(struct super_block *sb, int errno,
Dave Kleikampac27a0e2006-10-11 01:20:50 -070064 char nbuf[16]);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -040065static int ext4_remount(struct super_block *sb, int *flags, char *data);
66static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
Mingming Cao617ba132006-10-11 01:20:53 -070067static void ext4_unlockfs(struct super_block *sb);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -040068static void ext4_write_super(struct super_block *sb);
Mingming Cao617ba132006-10-11 01:20:53 -070069static void ext4_write_super_lockfs(struct super_block *sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -070070
Laurent Vivierbd81d8e2006-10-11 01:21:10 -070071
Alexandre Ratchov8fadc142006-10-11 01:21:15 -070072ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
73 struct ext4_group_desc *bg)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -070074{
Aneesh Kumar K.V3a145892007-10-16 18:38:25 -040075 return le32_to_cpu(bg->bg_block_bitmap_lo) |
Alexandre Ratchov8fadc142006-10-11 01:21:15 -070076 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
Aneesh Kumar K.V3a145892007-10-16 18:38:25 -040077 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -070078}
79
Alexandre Ratchov8fadc142006-10-11 01:21:15 -070080ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
81 struct ext4_group_desc *bg)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -070082{
Aneesh Kumar K.V5272f832007-10-16 18:38:25 -040083 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
Alexandre Ratchov8fadc142006-10-11 01:21:15 -070084 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
Aneesh Kumar K.V5272f832007-10-16 18:38:25 -040085 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -070086}
87
Alexandre Ratchov8fadc142006-10-11 01:21:15 -070088ext4_fsblk_t ext4_inode_table(struct super_block *sb,
89 struct ext4_group_desc *bg)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -070090{
Aneesh Kumar K.V5272f832007-10-16 18:38:25 -040091 return le32_to_cpu(bg->bg_inode_table_lo) |
Alexandre Ratchov8fadc142006-10-11 01:21:15 -070092 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
Aneesh Kumar K.V5272f832007-10-16 18:38:25 -040093 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -070094}
95
Alexandre Ratchov8fadc142006-10-11 01:21:15 -070096void ext4_block_bitmap_set(struct super_block *sb,
97 struct ext4_group_desc *bg, ext4_fsblk_t blk)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -070098{
Aneesh Kumar K.V3a145892007-10-16 18:38:25 -040099 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700100 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
101 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700102}
103
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700104void ext4_inode_bitmap_set(struct super_block *sb,
105 struct ext4_group_desc *bg, ext4_fsblk_t blk)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700106{
Aneesh Kumar K.V5272f832007-10-16 18:38:25 -0400107 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700108 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
109 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700110}
111
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700112void ext4_inode_table_set(struct super_block *sb,
113 struct ext4_group_desc *bg, ext4_fsblk_t blk)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700114{
Aneesh Kumar K.V5272f832007-10-16 18:38:25 -0400115 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700116 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
117 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700118}
119
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700120/*
Mingming Caodab291a2006-10-11 01:21:01 -0700121 * Wrappers for jbd2_journal_start/end.
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700122 *
123 * The only special thing we need to do here is to make sure that all
124 * journal_end calls result in the superblock being marked dirty, so
125 * that sync() will call the filesystem's write_super callback if
126 * appropriate.
127 */
Mingming Cao617ba132006-10-11 01:20:53 -0700128handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700129{
130 journal_t *journal;
131
132 if (sb->s_flags & MS_RDONLY)
133 return ERR_PTR(-EROFS);
134
135 /* Special case here: if the journal has aborted behind our
136 * backs (eg. EIO in the commit thread), then we still need to
137 * take the FS itself readonly cleanly. */
Mingming Cao617ba132006-10-11 01:20:53 -0700138 journal = EXT4_SB(sb)->s_journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700139 if (is_journal_aborted(journal)) {
Harvey Harrison46e665e2008-04-17 10:38:59 -0400140 ext4_abort(sb, __func__,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700141 "Detected aborted journal");
142 return ERR_PTR(-EROFS);
143 }
144
Mingming Caodab291a2006-10-11 01:21:01 -0700145 return jbd2_journal_start(journal, nblocks);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700146}
147
148/*
149 * The only special thing we need to do here is to make sure that all
Mingming Caodab291a2006-10-11 01:21:01 -0700150 * jbd2_journal_stop calls result in the superblock being marked dirty, so
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700151 * that sync() will call the filesystem's write_super callback if
152 * appropriate.
153 */
Mingming Cao617ba132006-10-11 01:20:53 -0700154int __ext4_journal_stop(const char *where, handle_t *handle)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700155{
156 struct super_block *sb;
157 int err;
158 int rc;
159
160 sb = handle->h_transaction->t_journal->j_private;
161 err = handle->h_err;
Mingming Caodab291a2006-10-11 01:21:01 -0700162 rc = jbd2_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700163
164 if (!err)
165 err = rc;
166 if (err)
Mingming Cao617ba132006-10-11 01:20:53 -0700167 __ext4_std_error(sb, where, err);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700168 return err;
169}
170
Mingming Cao617ba132006-10-11 01:20:53 -0700171void ext4_journal_abort_handle(const char *caller, const char *err_fn,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700172 struct buffer_head *bh, handle_t *handle, int err)
173{
174 char nbuf[16];
Mingming Cao617ba132006-10-11 01:20:53 -0700175 const char *errstr = ext4_decode_error(NULL, err, nbuf);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700176
177 if (bh)
178 BUFFER_TRACE(bh, "abort");
179
180 if (!handle->h_err)
181 handle->h_err = err;
182
183 if (is_handle_aborted(handle))
184 return;
185
186 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
187 caller, errstr, err_fn);
188
Mingming Caodab291a2006-10-11 01:21:01 -0700189 jbd2_journal_abort_handle(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700190}
191
192/* Deal with the reporting of failure conditions on a filesystem such as
193 * inconsistencies detected or read IO failures.
194 *
195 * On ext2, we can store the error state of the filesystem in the
Mingming Cao617ba132006-10-11 01:20:53 -0700196 * superblock. That is not possible on ext4, because we may have other
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700197 * write ordering constraints on the superblock which prevent us from
198 * writing it out straight away; and given that the journal is about to
199 * be aborted, we can't rely on the current, or future, transactions to
200 * write out the superblock safely.
201 *
Mingming Caodab291a2006-10-11 01:21:01 -0700202 * We'll just use the jbd2_journal_abort() error code to record an error in
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700203 * the journal instead. On recovery, the journal will compain about
204 * that error until we've noted it down and cleared it.
205 */
206
Mingming Cao617ba132006-10-11 01:20:53 -0700207static void ext4_handle_error(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700208{
Mingming Cao617ba132006-10-11 01:20:53 -0700209 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700210
Mingming Cao617ba132006-10-11 01:20:53 -0700211 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
212 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700213
214 if (sb->s_flags & MS_RDONLY)
215 return;
216
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400217 if (!test_opt(sb, ERRORS_CONT)) {
Mingming Cao617ba132006-10-11 01:20:53 -0700218 journal_t *journal = EXT4_SB(sb)->s_journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700219
Mingming Cao617ba132006-10-11 01:20:53 -0700220 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700221 if (journal)
Mingming Caodab291a2006-10-11 01:21:01 -0700222 jbd2_journal_abort(journal, -EIO);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700223 }
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400224 if (test_opt(sb, ERRORS_RO)) {
225 printk(KERN_CRIT "Remounting filesystem read-only\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700226 sb->s_flags |= MS_RDONLY;
227 }
Mingming Cao617ba132006-10-11 01:20:53 -0700228 ext4_commit_super(sb, es, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700229 if (test_opt(sb, ERRORS_PANIC))
Mingming Cao617ba132006-10-11 01:20:53 -0700230 panic("EXT4-fs (device %s): panic forced after error\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700231 sb->s_id);
232}
233
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400234void ext4_error(struct super_block *sb, const char *function,
235 const char *fmt, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700236{
237 va_list args;
238
239 va_start(args, fmt);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400240 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700241 vprintk(fmt, args);
242 printk("\n");
243 va_end(args);
244
Mingming Cao617ba132006-10-11 01:20:53 -0700245 ext4_handle_error(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700246}
247
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400248static const char *ext4_decode_error(struct super_block *sb, int errno,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700249 char nbuf[16])
250{
251 char *errstr = NULL;
252
253 switch (errno) {
254 case -EIO:
255 errstr = "IO failure";
256 break;
257 case -ENOMEM:
258 errstr = "Out of memory";
259 break;
260 case -EROFS:
Mingming Caodab291a2006-10-11 01:21:01 -0700261 if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700262 errstr = "Journal has aborted";
263 else
264 errstr = "Readonly filesystem";
265 break;
266 default:
267 /* If the caller passed in an extra buffer for unknown
268 * errors, textualise them now. Else we just return
269 * NULL. */
270 if (nbuf) {
271 /* Check for truncated error codes... */
272 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
273 errstr = nbuf;
274 }
275 break;
276 }
277
278 return errstr;
279}
280
Mingming Cao617ba132006-10-11 01:20:53 -0700281/* __ext4_std_error decodes expected errors from journaling functions
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700282 * automatically and invokes the appropriate error response. */
283
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400284void __ext4_std_error(struct super_block *sb, const char *function, int errno)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700285{
286 char nbuf[16];
287 const char *errstr;
288
289 /* Special case: if the error is EROFS, and we're not already
290 * inside a transaction, then there's really no point in logging
291 * an error. */
292 if (errno == -EROFS && journal_current_handle() == NULL &&
293 (sb->s_flags & MS_RDONLY))
294 return;
295
Mingming Cao617ba132006-10-11 01:20:53 -0700296 errstr = ext4_decode_error(sb, errno, nbuf);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400297 printk(KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n",
298 sb->s_id, function, errstr);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700299
Mingming Cao617ba132006-10-11 01:20:53 -0700300 ext4_handle_error(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700301}
302
303/*
Mingming Cao617ba132006-10-11 01:20:53 -0700304 * ext4_abort is a much stronger failure handler than ext4_error. The
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700305 * abort function may be used to deal with unrecoverable failures such
306 * as journal IO errors or ENOMEM at a critical moment in log management.
307 *
308 * We unconditionally force the filesystem into an ABORT|READONLY state,
309 * unless the error response on the fs has been set to panic in which
310 * case we take the easy way out and panic immediately.
311 */
312
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400313void ext4_abort(struct super_block *sb, const char *function,
314 const char *fmt, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700315{
316 va_list args;
317
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400318 printk(KERN_CRIT "ext4_abort called.\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700319
320 va_start(args, fmt);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400321 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700322 vprintk(fmt, args);
323 printk("\n");
324 va_end(args);
325
326 if (test_opt(sb, ERRORS_PANIC))
Mingming Cao617ba132006-10-11 01:20:53 -0700327 panic("EXT4-fs panic from previous error\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700328
329 if (sb->s_flags & MS_RDONLY)
330 return;
331
332 printk(KERN_CRIT "Remounting filesystem read-only\n");
Mingming Cao617ba132006-10-11 01:20:53 -0700333 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700334 sb->s_flags |= MS_RDONLY;
Mingming Cao617ba132006-10-11 01:20:53 -0700335 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
Mingming Caodab291a2006-10-11 01:21:01 -0700336 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700337}
338
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400339void ext4_warning(struct super_block *sb, const char *function,
340 const char *fmt, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700341{
342 va_list args;
343
344 va_start(args, fmt);
Mingming Cao617ba132006-10-11 01:20:53 -0700345 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ",
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700346 sb->s_id, function);
347 vprintk(fmt, args);
348 printk("\n");
349 va_end(args);
350}
351
Mingming Cao617ba132006-10-11 01:20:53 -0700352void ext4_update_dynamic_rev(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700353{
Mingming Cao617ba132006-10-11 01:20:53 -0700354 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700355
Mingming Cao617ba132006-10-11 01:20:53 -0700356 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700357 return;
358
Harvey Harrison46e665e2008-04-17 10:38:59 -0400359 ext4_warning(sb, __func__,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700360 "updating to rev %d because of new feature flag, "
361 "running e2fsck is recommended",
Mingming Cao617ba132006-10-11 01:20:53 -0700362 EXT4_DYNAMIC_REV);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700363
Mingming Cao617ba132006-10-11 01:20:53 -0700364 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
365 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
366 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700367 /* leave es->s_feature_*compat flags alone */
368 /* es->s_uuid will be set by e2fsck if empty */
369
370 /*
371 * The rest of the superblock fields should be zero, and if not it
372 * means they are likely already in use, so leave them alone. We
373 * can leave it up to e2fsck to clean up any inconsistencies there.
374 */
375}
376
Aneesh Kumar K.V99e6f822008-01-28 23:58:27 -0500377int ext4_update_compat_feature(handle_t *handle,
378 struct super_block *sb, __u32 compat)
379{
380 int err = 0;
381 if (!EXT4_HAS_COMPAT_FEATURE(sb, compat)) {
382 err = ext4_journal_get_write_access(handle,
383 EXT4_SB(sb)->s_sbh);
384 if (err)
385 return err;
386 EXT4_SET_COMPAT_FEATURE(sb, compat);
387 sb->s_dirt = 1;
388 handle->h_sync = 1;
389 BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
390 "call ext4_journal_dirty_met adata");
391 err = ext4_journal_dirty_metadata(handle,
392 EXT4_SB(sb)->s_sbh);
393 }
394 return err;
395}
396
397int ext4_update_rocompat_feature(handle_t *handle,
398 struct super_block *sb, __u32 rocompat)
399{
400 int err = 0;
401 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, rocompat)) {
402 err = ext4_journal_get_write_access(handle,
403 EXT4_SB(sb)->s_sbh);
404 if (err)
405 return err;
406 EXT4_SET_RO_COMPAT_FEATURE(sb, rocompat);
407 sb->s_dirt = 1;
408 handle->h_sync = 1;
409 BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
410 "call ext4_journal_dirty_met adata");
411 err = ext4_journal_dirty_metadata(handle,
412 EXT4_SB(sb)->s_sbh);
413 }
414 return err;
415}
416
417int ext4_update_incompat_feature(handle_t *handle,
418 struct super_block *sb, __u32 incompat)
419{
420 int err = 0;
421 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, incompat)) {
422 err = ext4_journal_get_write_access(handle,
423 EXT4_SB(sb)->s_sbh);
424 if (err)
425 return err;
426 EXT4_SET_INCOMPAT_FEATURE(sb, incompat);
427 sb->s_dirt = 1;
428 handle->h_sync = 1;
429 BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
430 "call ext4_journal_dirty_met adata");
431 err = ext4_journal_dirty_metadata(handle,
432 EXT4_SB(sb)->s_sbh);
433 }
434 return err;
435}
436
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700437/*
438 * Open the external journal device
439 */
Mingming Cao617ba132006-10-11 01:20:53 -0700440static struct block_device *ext4_blkdev_get(dev_t dev)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700441{
442 struct block_device *bdev;
443 char b[BDEVNAME_SIZE];
444
445 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
446 if (IS_ERR(bdev))
447 goto fail;
448 return bdev;
449
450fail:
Mingming Cao617ba132006-10-11 01:20:53 -0700451 printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700452 __bdevname(dev, b), PTR_ERR(bdev));
453 return NULL;
454}
455
456/*
457 * Release the journal device
458 */
Mingming Cao617ba132006-10-11 01:20:53 -0700459static int ext4_blkdev_put(struct block_device *bdev)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700460{
461 bd_release(bdev);
462 return blkdev_put(bdev);
463}
464
Mingming Cao617ba132006-10-11 01:20:53 -0700465static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700466{
467 struct block_device *bdev;
468 int ret = -ENODEV;
469
470 bdev = sbi->journal_bdev;
471 if (bdev) {
Mingming Cao617ba132006-10-11 01:20:53 -0700472 ret = ext4_blkdev_put(bdev);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700473 sbi->journal_bdev = NULL;
474 }
475 return ret;
476}
477
478static inline struct inode *orphan_list_entry(struct list_head *l)
479{
Mingming Cao617ba132006-10-11 01:20:53 -0700480 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700481}
482
Mingming Cao617ba132006-10-11 01:20:53 -0700483static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700484{
485 struct list_head *l;
486
487 printk(KERN_ERR "sb orphan head is %d\n",
488 le32_to_cpu(sbi->s_es->s_last_orphan));
489
490 printk(KERN_ERR "sb_info orphan list:\n");
491 list_for_each(l, &sbi->s_orphan) {
492 struct inode *inode = orphan_list_entry(l);
493 printk(KERN_ERR " "
494 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
495 inode->i_sb->s_id, inode->i_ino, inode,
496 inode->i_mode, inode->i_nlink,
497 NEXT_ORPHAN(inode));
498 }
499}
500
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400501static void ext4_put_super(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700502{
Mingming Cao617ba132006-10-11 01:20:53 -0700503 struct ext4_sb_info *sbi = EXT4_SB(sb);
504 struct ext4_super_block *es = sbi->s_es;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700505 int i;
506
Alex Tomasc9de5602008-01-29 00:19:52 -0500507 ext4_mb_release(sb);
Alex Tomasa86c6182006-10-11 01:21:03 -0700508 ext4_ext_release(sb);
Mingming Cao617ba132006-10-11 01:20:53 -0700509 ext4_xattr_put_super(sb);
Hidehiro Kawai7ffe1ea2008-10-10 20:29:21 -0400510 if (jbd2_journal_destroy(sbi->s_journal) < 0)
511 ext4_abort(sb, __func__, "Couldn't clean up the journal");
Jan Kara47b4a502008-07-11 19:27:31 -0400512 sbi->s_journal = NULL;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700513 if (!(sb->s_flags & MS_RDONLY)) {
Mingming Cao617ba132006-10-11 01:20:53 -0700514 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700515 es->s_state = cpu_to_le16(sbi->s_mount_state);
Mingming Cao617ba132006-10-11 01:20:53 -0700516 ext4_commit_super(sb, es, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700517 }
Theodore Ts'o240799c2008-10-09 23:53:47 -0400518 if (sbi->s_proc) {
519 remove_proc_entry("inode_readahead_blks", sbi->s_proc);
Theodore Ts'o9f6200b2008-09-23 09:18:24 -0400520 remove_proc_entry(sb->s_id, ext4_proc_root);
Theodore Ts'o240799c2008-10-09 23:53:47 -0400521 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700522
523 for (i = 0; i < sbi->s_gdb_count; i++)
524 brelse(sbi->s_group_desc[i]);
525 kfree(sbi->s_group_desc);
Jose R. Santos772cb7c2008-07-11 19:27:31 -0400526 kfree(sbi->s_flex_groups);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700527 percpu_counter_destroy(&sbi->s_freeblocks_counter);
528 percpu_counter_destroy(&sbi->s_freeinodes_counter);
529 percpu_counter_destroy(&sbi->s_dirs_counter);
Aneesh Kumar K.V6bc6e632008-10-10 09:39:00 -0400530 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700531 brelse(sbi->s_sbh);
532#ifdef CONFIG_QUOTA
533 for (i = 0; i < MAXQUOTAS; i++)
534 kfree(sbi->s_qf_names[i]);
535#endif
536
537 /* Debugging code just in case the in-memory inode orphan list
538 * isn't empty. The on-disk one can be non-empty if we've
539 * detected an error and taken the fs readonly, but the
540 * in-memory list had better be clean by this point. */
541 if (!list_empty(&sbi->s_orphan))
542 dump_orphan_list(sb, sbi);
543 J_ASSERT(list_empty(&sbi->s_orphan));
544
Peter Zijlstraf98393a2007-05-06 14:49:54 -0700545 invalidate_bdev(sb->s_bdev);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700546 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
547 /*
548 * Invalidate the journal device's buffers. We don't want them
549 * floating about in memory - the physical journal device may
550 * hotswapped, and it breaks the `ro-after' testing code.
551 */
552 sync_blockdev(sbi->journal_bdev);
Peter Zijlstraf98393a2007-05-06 14:49:54 -0700553 invalidate_bdev(sbi->journal_bdev);
Mingming Cao617ba132006-10-11 01:20:53 -0700554 ext4_blkdev_remove(sbi);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700555 }
556 sb->s_fs_info = NULL;
557 kfree(sbi);
558 return;
559}
560
Christoph Lametere18b8902006-12-06 20:33:20 -0800561static struct kmem_cache *ext4_inode_cachep;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700562
563/*
564 * Called inside transaction, so use GFP_NOFS
565 */
Mingming Cao617ba132006-10-11 01:20:53 -0700566static struct inode *ext4_alloc_inode(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700567{
Mingming Cao617ba132006-10-11 01:20:53 -0700568 struct ext4_inode_info *ei;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700569
Christoph Lametere6b4f8d2006-12-06 20:33:14 -0800570 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700571 if (!ei)
572 return NULL;
Theodore Ts'o03010a32008-10-10 20:02:48 -0400573#ifdef CONFIG_EXT4_FS_POSIX_ACL
Mingming Cao617ba132006-10-11 01:20:53 -0700574 ei->i_acl = EXT4_ACL_NOT_CACHED;
575 ei->i_default_acl = EXT4_ACL_NOT_CACHED;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700576#endif
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700577 ei->vfs_inode.i_version = 1;
Aneesh Kumar K.V91246c02008-08-19 21:14:52 -0400578 ei->vfs_inode.i_data.writeback_index = 0;
Alex Tomasa86c6182006-10-11 01:21:03 -0700579 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
Alex Tomasc9de5602008-01-29 00:19:52 -0500580 INIT_LIST_HEAD(&ei->i_prealloc_list);
581 spin_lock_init(&ei->i_prealloc_lock);
Jan Kara678aaf42008-07-11 19:27:31 -0400582 jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode);
Mingming Caod2a17632008-07-14 17:52:37 -0400583 ei->i_reserved_data_blocks = 0;
584 ei->i_reserved_meta_blocks = 0;
585 ei->i_allocated_meta_blocks = 0;
586 ei->i_delalloc_reserved_flag = 0;
587 spin_lock_init(&(ei->i_block_reservation_lock));
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700588 return &ei->vfs_inode;
589}
590
Mingming Cao617ba132006-10-11 01:20:53 -0700591static void ext4_destroy_inode(struct inode *inode)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700592{
Vasily Averin9f7dd932007-07-15 23:40:45 -0700593 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
594 printk("EXT4 Inode %p: orphan list check failed!\n",
595 EXT4_I(inode));
596 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
597 EXT4_I(inode), sizeof(struct ext4_inode_info),
598 true);
599 dump_stack();
600 }
Mingming Cao617ba132006-10-11 01:20:53 -0700601 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700602}
603
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700604static void init_once(void *foo)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700605{
Mingming Cao617ba132006-10-11 01:20:53 -0700606 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700607
Christoph Lametera35afb82007-05-16 22:10:57 -0700608 INIT_LIST_HEAD(&ei->i_orphan);
Theodore Ts'o03010a32008-10-10 20:02:48 -0400609#ifdef CONFIG_EXT4_FS_XATTR
Christoph Lametera35afb82007-05-16 22:10:57 -0700610 init_rwsem(&ei->xattr_sem);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700611#endif
Aneesh Kumar K.V0e855ac2008-01-28 23:58:26 -0500612 init_rwsem(&ei->i_data_sem);
Christoph Lametera35afb82007-05-16 22:10:57 -0700613 inode_init_once(&ei->vfs_inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700614}
615
616static int init_inodecache(void)
617{
Mingming Cao617ba132006-10-11 01:20:53 -0700618 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
619 sizeof(struct ext4_inode_info),
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700620 0, (SLAB_RECLAIM_ACCOUNT|
621 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900622 init_once);
Mingming Cao617ba132006-10-11 01:20:53 -0700623 if (ext4_inode_cachep == NULL)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700624 return -ENOMEM;
625 return 0;
626}
627
628static void destroy_inodecache(void)
629{
Mingming Cao617ba132006-10-11 01:20:53 -0700630 kmem_cache_destroy(ext4_inode_cachep);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700631}
632
Mingming Cao617ba132006-10-11 01:20:53 -0700633static void ext4_clear_inode(struct inode *inode)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700634{
Theodore Ts'o03010a32008-10-10 20:02:48 -0400635#ifdef CONFIG_EXT4_FS_POSIX_ACL
Mingming Cao617ba132006-10-11 01:20:53 -0700636 if (EXT4_I(inode)->i_acl &&
637 EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) {
638 posix_acl_release(EXT4_I(inode)->i_acl);
639 EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700640 }
Mingming Cao617ba132006-10-11 01:20:53 -0700641 if (EXT4_I(inode)->i_default_acl &&
642 EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) {
643 posix_acl_release(EXT4_I(inode)->i_default_acl);
644 EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700645 }
646#endif
Theodore Ts'oc2ea3fd2008-10-10 09:40:52 -0400647 ext4_discard_preallocations(inode);
Jan Kara678aaf42008-07-11 19:27:31 -0400648 jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal,
649 &EXT4_I(inode)->jinode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700650}
651
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400652static inline void ext4_show_quota_options(struct seq_file *seq,
653 struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700654{
655#if defined(CONFIG_QUOTA)
Mingming Cao617ba132006-10-11 01:20:53 -0700656 struct ext4_sb_info *sbi = EXT4_SB(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700657
658 if (sbi->s_jquota_fmt)
659 seq_printf(seq, ",jqfmt=%s",
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400660 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold" : "vfsv0");
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700661
662 if (sbi->s_qf_names[USRQUOTA])
663 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
664
665 if (sbi->s_qf_names[GRPQUOTA])
666 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
667
Mingming Cao617ba132006-10-11 01:20:53 -0700668 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700669 seq_puts(seq, ",usrquota");
670
Mingming Cao617ba132006-10-11 01:20:53 -0700671 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700672 seq_puts(seq, ",grpquota");
673#endif
674}
675
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700676/*
677 * Show an option if
678 * - it's set to a non-default value OR
679 * - if the per-sb default is different from the global default
680 */
Mingming Cao617ba132006-10-11 01:20:53 -0700681static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700682{
Aneesh Kumar K.Vaa22df22008-01-28 23:58:27 -0500683 int def_errors;
684 unsigned long def_mount_opts;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700685 struct super_block *sb = vfs->mnt_sb;
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700686 struct ext4_sb_info *sbi = EXT4_SB(sb);
687 struct ext4_super_block *es = sbi->s_es;
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700688
689 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
Aneesh Kumar K.Vaa22df22008-01-28 23:58:27 -0500690 def_errors = le16_to_cpu(es->s_errors);
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700691
692 if (sbi->s_sb_block != 1)
693 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
694 if (test_opt(sb, MINIX_DF))
695 seq_puts(seq, ",minixdf");
Aneesh Kumar K.Vaa22df22008-01-28 23:58:27 -0500696 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700697 seq_puts(seq, ",grpid");
698 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
699 seq_puts(seq, ",nogrpid");
700 if (sbi->s_resuid != EXT4_DEF_RESUID ||
701 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
702 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
703 }
704 if (sbi->s_resgid != EXT4_DEF_RESGID ||
705 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
706 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
707 }
Aneesh Kumar K.Vbb4f3972008-01-28 23:58:26 -0500708 if (test_opt(sb, ERRORS_RO)) {
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700709 if (def_errors == EXT4_ERRORS_PANIC ||
Aneesh Kumar K.Vbb4f3972008-01-28 23:58:26 -0500710 def_errors == EXT4_ERRORS_CONTINUE) {
711 seq_puts(seq, ",errors=remount-ro");
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700712 }
713 }
Aneesh Kumar K.Vaa22df22008-01-28 23:58:27 -0500714 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
Aneesh Kumar K.Vbb4f3972008-01-28 23:58:26 -0500715 seq_puts(seq, ",errors=continue");
Aneesh Kumar K.Vaa22df22008-01-28 23:58:27 -0500716 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700717 seq_puts(seq, ",errors=panic");
Aneesh Kumar K.Vaa22df22008-01-28 23:58:27 -0500718 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700719 seq_puts(seq, ",nouid32");
Aneesh Kumar K.Vaa22df22008-01-28 23:58:27 -0500720 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700721 seq_puts(seq, ",debug");
722 if (test_opt(sb, OLDALLOC))
723 seq_puts(seq, ",oldalloc");
Theodore Ts'o03010a32008-10-10 20:02:48 -0400724#ifdef CONFIG_EXT4_FS_XATTR
Aneesh Kumar K.Vaa22df22008-01-28 23:58:27 -0500725 if (test_opt(sb, XATTR_USER) &&
726 !(def_mount_opts & EXT4_DEFM_XATTR_USER))
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700727 seq_puts(seq, ",user_xattr");
728 if (!test_opt(sb, XATTR_USER) &&
729 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
730 seq_puts(seq, ",nouser_xattr");
731 }
732#endif
Theodore Ts'o03010a32008-10-10 20:02:48 -0400733#ifdef CONFIG_EXT4_FS_POSIX_ACL
Aneesh Kumar K.Vaa22df22008-01-28 23:58:27 -0500734 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700735 seq_puts(seq, ",acl");
736 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
737 seq_puts(seq, ",noacl");
738#endif
739 if (!test_opt(sb, RESERVATION))
740 seq_puts(seq, ",noreservation");
741 if (sbi->s_commit_interval) {
742 seq_printf(seq, ",commit=%u",
743 (unsigned) (sbi->s_commit_interval / HZ));
744 }
Eric Sandeen571640c2008-05-26 12:29:46 -0400745 /*
746 * We're changing the default of barrier mount option, so
747 * let's always display its mount state so it's clear what its
748 * status is.
749 */
750 seq_puts(seq, ",barrier=");
751 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
Theodore Ts'ocd0b6a32008-05-26 10:28:28 -0400752 if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
753 seq_puts(seq, ",journal_async_commit");
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700754 if (test_opt(sb, NOBH))
755 seq_puts(seq, ",nobh");
756 if (!test_opt(sb, EXTENTS))
757 seq_puts(seq, ",noextents");
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500758 if (test_opt(sb, I_VERSION))
759 seq_puts(seq, ",i_version");
Aneesh Kumar K.Vdd919b92008-07-11 19:27:31 -0400760 if (!test_opt(sb, DELALLOC))
761 seq_puts(seq, ",nodelalloc");
762
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700763
Miklos Szeredicb45bbe2008-01-28 23:58:27 -0500764 if (sbi->s_stripe)
765 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
Aneesh Kumar K.Vaa22df22008-01-28 23:58:27 -0500766 /*
767 * journal mode get enabled in different ways
768 * So just print the value even if we didn't specify it
769 */
Mingming Cao617ba132006-10-11 01:20:53 -0700770 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700771 seq_puts(seq, ",data=journal");
Mingming Cao617ba132006-10-11 01:20:53 -0700772 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700773 seq_puts(seq, ",data=ordered");
Mingming Cao617ba132006-10-11 01:20:53 -0700774 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700775 seq_puts(seq, ",data=writeback");
776
Theodore Ts'o240799c2008-10-09 23:53:47 -0400777 if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
778 seq_printf(seq, ",inode_readahead_blks=%u",
779 sbi->s_inode_readahead_blks);
780
Hidehiro Kawai5bf56832008-10-10 22:12:43 -0400781 if (test_opt(sb, DATA_ERR_ABORT))
782 seq_puts(seq, ",data_err=abort");
783
Mingming Cao617ba132006-10-11 01:20:53 -0700784 ext4_show_quota_options(seq, sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700785 return 0;
786}
787
788
Christoph Hellwig1b961ac2007-10-21 16:42:08 -0700789static struct inode *ext4_nfs_get_inode(struct super_block *sb,
790 u64 ino, u32 generation)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700791{
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700792 struct inode *inode;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700793
Mingming Cao617ba132006-10-11 01:20:53 -0700794 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700795 return ERR_PTR(-ESTALE);
Mingming Cao617ba132006-10-11 01:20:53 -0700796 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700797 return ERR_PTR(-ESTALE);
798
799 /* iget isn't really right if the inode is currently unallocated!!
800 *
Mingming Cao617ba132006-10-11 01:20:53 -0700801 * ext4_read_inode will return a bad_inode if the inode had been
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700802 * deleted, so we should be safe.
803 *
804 * Currently we don't know the generation for parent directory, so
805 * a generation of 0 means "accept any"
806 */
David Howells1d1fe1e2008-02-07 00:15:37 -0800807 inode = ext4_iget(sb, ino);
808 if (IS_ERR(inode))
809 return ERR_CAST(inode);
810 if (generation && inode->i_generation != generation) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700811 iput(inode);
812 return ERR_PTR(-ESTALE);
813 }
Christoph Hellwig1b961ac2007-10-21 16:42:08 -0700814
815 return inode;
816}
817
818static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
819 int fh_len, int fh_type)
820{
821 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
822 ext4_nfs_get_inode);
823}
824
825static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
826 int fh_len, int fh_type)
827{
828 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
829 ext4_nfs_get_inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700830}
831
832#ifdef CONFIG_QUOTA
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400833#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400834#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700835
Mingming Cao617ba132006-10-11 01:20:53 -0700836static int ext4_dquot_initialize(struct inode *inode, int type);
837static int ext4_dquot_drop(struct inode *inode);
838static int ext4_write_dquot(struct dquot *dquot);
839static int ext4_acquire_dquot(struct dquot *dquot);
840static int ext4_release_dquot(struct dquot *dquot);
841static int ext4_mark_dquot_dirty(struct dquot *dquot);
842static int ext4_write_info(struct super_block *sb, int type);
Jan Kara6f28e082008-04-28 02:14:34 -0700843static int ext4_quota_on(struct super_block *sb, int type, int format_id,
844 char *path, int remount);
Mingming Cao617ba132006-10-11 01:20:53 -0700845static int ext4_quota_on_mount(struct super_block *sb, int type);
846static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700847 size_t len, loff_t off);
Mingming Cao617ba132006-10-11 01:20:53 -0700848static ssize_t ext4_quota_write(struct super_block *sb, int type,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700849 const char *data, size_t len, loff_t off);
850
Mingming Cao617ba132006-10-11 01:20:53 -0700851static struct dquot_operations ext4_quota_operations = {
852 .initialize = ext4_dquot_initialize,
853 .drop = ext4_dquot_drop,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700854 .alloc_space = dquot_alloc_space,
855 .alloc_inode = dquot_alloc_inode,
856 .free_space = dquot_free_space,
857 .free_inode = dquot_free_inode,
858 .transfer = dquot_transfer,
Mingming Cao617ba132006-10-11 01:20:53 -0700859 .write_dquot = ext4_write_dquot,
860 .acquire_dquot = ext4_acquire_dquot,
861 .release_dquot = ext4_release_dquot,
862 .mark_dirty = ext4_mark_dquot_dirty,
863 .write_info = ext4_write_info
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700864};
865
Mingming Cao617ba132006-10-11 01:20:53 -0700866static struct quotactl_ops ext4_qctl_operations = {
867 .quota_on = ext4_quota_on,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700868 .quota_off = vfs_quota_off,
869 .quota_sync = vfs_quota_sync,
870 .get_info = vfs_get_dqinfo,
871 .set_info = vfs_set_dqinfo,
872 .get_dqblk = vfs_get_dqblk,
873 .set_dqblk = vfs_set_dqblk
874};
875#endif
876
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800877static const struct super_operations ext4_sops = {
Mingming Cao617ba132006-10-11 01:20:53 -0700878 .alloc_inode = ext4_alloc_inode,
879 .destroy_inode = ext4_destroy_inode,
Mingming Cao617ba132006-10-11 01:20:53 -0700880 .write_inode = ext4_write_inode,
881 .dirty_inode = ext4_dirty_inode,
882 .delete_inode = ext4_delete_inode,
883 .put_super = ext4_put_super,
884 .write_super = ext4_write_super,
885 .sync_fs = ext4_sync_fs,
886 .write_super_lockfs = ext4_write_super_lockfs,
887 .unlockfs = ext4_unlockfs,
888 .statfs = ext4_statfs,
889 .remount_fs = ext4_remount,
890 .clear_inode = ext4_clear_inode,
891 .show_options = ext4_show_options,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700892#ifdef CONFIG_QUOTA
Mingming Cao617ba132006-10-11 01:20:53 -0700893 .quota_read = ext4_quota_read,
894 .quota_write = ext4_quota_write,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700895#endif
896};
897
Christoph Hellwig39655162007-10-21 16:42:17 -0700898static const struct export_operations ext4_export_ops = {
Christoph Hellwig1b961ac2007-10-21 16:42:08 -0700899 .fh_to_dentry = ext4_fh_to_dentry,
900 .fh_to_parent = ext4_fh_to_parent,
Mingming Cao617ba132006-10-11 01:20:53 -0700901 .get_parent = ext4_get_parent,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700902};
903
904enum {
905 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
906 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
907 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
908 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
909 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
910 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
Girish Shilamkar818d2762008-01-28 23:58:27 -0500911 Opt_journal_checksum, Opt_journal_async_commit,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700912 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
Hidehiro Kawai5bf56832008-10-10 22:12:43 -0400913 Opt_data_err_abort, Opt_data_err_ignore,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700914 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
915 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
916 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500917 Opt_grpquota, Opt_extents, Opt_noextents, Opt_i_version,
Aneesh Kumar K.Vdd919b92008-07-11 19:27:31 -0400918 Opt_mballoc, Opt_nomballoc, Opt_stripe, Opt_delalloc, Opt_nodelalloc,
Theodore Ts'o240799c2008-10-09 23:53:47 -0400919 Opt_inode_readahead_blks
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700920};
921
Steven Whitehousea447c092008-10-13 10:46:57 +0100922static const match_table_t tokens = {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700923 {Opt_bsd_df, "bsddf"},
924 {Opt_minix_df, "minixdf"},
925 {Opt_grpid, "grpid"},
926 {Opt_grpid, "bsdgroups"},
927 {Opt_nogrpid, "nogrpid"},
928 {Opt_nogrpid, "sysvgroups"},
929 {Opt_resgid, "resgid=%u"},
930 {Opt_resuid, "resuid=%u"},
931 {Opt_sb, "sb=%u"},
932 {Opt_err_cont, "errors=continue"},
933 {Opt_err_panic, "errors=panic"},
934 {Opt_err_ro, "errors=remount-ro"},
935 {Opt_nouid32, "nouid32"},
936 {Opt_nocheck, "nocheck"},
937 {Opt_nocheck, "check=none"},
938 {Opt_debug, "debug"},
939 {Opt_oldalloc, "oldalloc"},
940 {Opt_orlov, "orlov"},
941 {Opt_user_xattr, "user_xattr"},
942 {Opt_nouser_xattr, "nouser_xattr"},
943 {Opt_acl, "acl"},
944 {Opt_noacl, "noacl"},
945 {Opt_reservation, "reservation"},
946 {Opt_noreservation, "noreservation"},
947 {Opt_noload, "noload"},
948 {Opt_nobh, "nobh"},
949 {Opt_bh, "bh"},
950 {Opt_commit, "commit=%u"},
951 {Opt_journal_update, "journal=update"},
952 {Opt_journal_inum, "journal=%u"},
953 {Opt_journal_dev, "journal_dev=%u"},
Girish Shilamkar818d2762008-01-28 23:58:27 -0500954 {Opt_journal_checksum, "journal_checksum"},
955 {Opt_journal_async_commit, "journal_async_commit"},
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700956 {Opt_abort, "abort"},
957 {Opt_data_journal, "data=journal"},
958 {Opt_data_ordered, "data=ordered"},
959 {Opt_data_writeback, "data=writeback"},
Hidehiro Kawai5bf56832008-10-10 22:12:43 -0400960 {Opt_data_err_abort, "data_err=abort"},
961 {Opt_data_err_ignore, "data_err=ignore"},
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700962 {Opt_offusrjquota, "usrjquota="},
963 {Opt_usrjquota, "usrjquota=%s"},
964 {Opt_offgrpjquota, "grpjquota="},
965 {Opt_grpjquota, "grpjquota=%s"},
966 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
967 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
968 {Opt_grpquota, "grpquota"},
969 {Opt_noquota, "noquota"},
970 {Opt_quota, "quota"},
971 {Opt_usrquota, "usrquota"},
972 {Opt_barrier, "barrier=%u"},
Alex Tomasa86c6182006-10-11 01:21:03 -0700973 {Opt_extents, "extents"},
Mingming Cao1e2462f2007-07-18 09:00:55 -0400974 {Opt_noextents, "noextents"},
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500975 {Opt_i_version, "i_version"},
Alex Tomasc9de5602008-01-29 00:19:52 -0500976 {Opt_mballoc, "mballoc"},
977 {Opt_nomballoc, "nomballoc"},
978 {Opt_stripe, "stripe=%u"},
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700979 {Opt_resize, "resize"},
Alex Tomas64769242008-07-11 19:27:31 -0400980 {Opt_delalloc, "delalloc"},
Aneesh Kumar K.Vdd919b92008-07-11 19:27:31 -0400981 {Opt_nodelalloc, "nodelalloc"},
Theodore Ts'o240799c2008-10-09 23:53:47 -0400982 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
Josef Bacikf3f12fa2008-04-29 22:05:28 -0400983 {Opt_err, NULL},
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700984};
985
Mingming Cao617ba132006-10-11 01:20:53 -0700986static ext4_fsblk_t get_sb_block(void **data)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700987{
Mingming Cao617ba132006-10-11 01:20:53 -0700988 ext4_fsblk_t sb_block;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700989 char *options = (char *) *data;
990
991 if (!options || strncmp(options, "sb=", 3) != 0)
992 return 1; /* Default location */
993 options += 3;
Mingming Cao617ba132006-10-11 01:20:53 -0700994 /*todo: use simple_strtoll with >32bit ext4 */
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700995 sb_block = simple_strtoul(options, &options, 0);
996 if (*options && *options != ',') {
Theodore Ts'o4776004f2008-09-08 23:00:52 -0400997 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700998 (char *) *data);
999 return 1;
1000 }
1001 if (*options == ',')
1002 options++;
1003 *data = (void *) options;
1004 return sb_block;
1005}
1006
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001007static int parse_options(char *options, struct super_block *sb,
1008 unsigned int *inum, unsigned long *journal_devnum,
1009 ext4_fsblk_t *n_blocks_count, int is_remount)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001010{
Mingming Cao617ba132006-10-11 01:20:53 -07001011 struct ext4_sb_info *sbi = EXT4_SB(sb);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001012 char *p;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001013 substring_t args[MAX_OPT_ARGS];
1014 int data_opt = 0;
1015 int option;
1016#ifdef CONFIG_QUOTA
Jan Karadfc5d032008-05-13 19:11:51 -04001017 int qtype, qfmt;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001018 char *qname;
1019#endif
Aneesh Kumar K.Vc07651b2008-07-11 19:27:31 -04001020 ext4_fsblk_t last_block;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001021
1022 if (!options)
1023 return 1;
1024
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001025 while ((p = strsep(&options, ",")) != NULL) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001026 int token;
1027 if (!*p)
1028 continue;
1029
1030 token = match_token(p, tokens, args);
1031 switch (token) {
1032 case Opt_bsd_df:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001033 clear_opt(sbi->s_mount_opt, MINIX_DF);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001034 break;
1035 case Opt_minix_df:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001036 set_opt(sbi->s_mount_opt, MINIX_DF);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001037 break;
1038 case Opt_grpid:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001039 set_opt(sbi->s_mount_opt, GRPID);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001040 break;
1041 case Opt_nogrpid:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001042 clear_opt(sbi->s_mount_opt, GRPID);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001043 break;
1044 case Opt_resuid:
1045 if (match_int(&args[0], &option))
1046 return 0;
1047 sbi->s_resuid = option;
1048 break;
1049 case Opt_resgid:
1050 if (match_int(&args[0], &option))
1051 return 0;
1052 sbi->s_resgid = option;
1053 break;
1054 case Opt_sb:
1055 /* handled by get_sb_block() instead of here */
1056 /* *sb_block = match_int(&args[0]); */
1057 break;
1058 case Opt_err_panic:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001059 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1060 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1061 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001062 break;
1063 case Opt_err_ro:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001064 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1065 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1066 set_opt(sbi->s_mount_opt, ERRORS_RO);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001067 break;
1068 case Opt_err_cont:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001069 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1070 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1071 set_opt(sbi->s_mount_opt, ERRORS_CONT);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001072 break;
1073 case Opt_nouid32:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001074 set_opt(sbi->s_mount_opt, NO_UID32);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001075 break;
1076 case Opt_nocheck:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001077 clear_opt(sbi->s_mount_opt, CHECK);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001078 break;
1079 case Opt_debug:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001080 set_opt(sbi->s_mount_opt, DEBUG);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001081 break;
1082 case Opt_oldalloc:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001083 set_opt(sbi->s_mount_opt, OLDALLOC);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001084 break;
1085 case Opt_orlov:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001086 clear_opt(sbi->s_mount_opt, OLDALLOC);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001087 break;
Theodore Ts'o03010a32008-10-10 20:02:48 -04001088#ifdef CONFIG_EXT4_FS_XATTR
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001089 case Opt_user_xattr:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001090 set_opt(sbi->s_mount_opt, XATTR_USER);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001091 break;
1092 case Opt_nouser_xattr:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001093 clear_opt(sbi->s_mount_opt, XATTR_USER);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001094 break;
1095#else
1096 case Opt_user_xattr:
1097 case Opt_nouser_xattr:
Theodore Ts'o4776004f2008-09-08 23:00:52 -04001098 printk(KERN_ERR "EXT4 (no)user_xattr options "
1099 "not supported\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001100 break;
1101#endif
Theodore Ts'o03010a32008-10-10 20:02:48 -04001102#ifdef CONFIG_EXT4_FS_POSIX_ACL
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001103 case Opt_acl:
1104 set_opt(sbi->s_mount_opt, POSIX_ACL);
1105 break;
1106 case Opt_noacl:
1107 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1108 break;
1109#else
1110 case Opt_acl:
1111 case Opt_noacl:
Theodore Ts'o4776004f2008-09-08 23:00:52 -04001112 printk(KERN_ERR "EXT4 (no)acl options "
1113 "not supported\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001114 break;
1115#endif
1116 case Opt_reservation:
1117 set_opt(sbi->s_mount_opt, RESERVATION);
1118 break;
1119 case Opt_noreservation:
1120 clear_opt(sbi->s_mount_opt, RESERVATION);
1121 break;
1122 case Opt_journal_update:
1123 /* @@@ FIXME */
1124 /* Eventually we will want to be able to create
1125 a journal file here. For now, only allow the
1126 user to specify an existing inode to be the
1127 journal file. */
1128 if (is_remount) {
Mingming Cao617ba132006-10-11 01:20:53 -07001129 printk(KERN_ERR "EXT4-fs: cannot specify "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001130 "journal on remount\n");
1131 return 0;
1132 }
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001133 set_opt(sbi->s_mount_opt, UPDATE_JOURNAL);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001134 break;
1135 case Opt_journal_inum:
1136 if (is_remount) {
Mingming Cao617ba132006-10-11 01:20:53 -07001137 printk(KERN_ERR "EXT4-fs: cannot specify "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001138 "journal on remount\n");
1139 return 0;
1140 }
1141 if (match_int(&args[0], &option))
1142 return 0;
1143 *inum = option;
1144 break;
1145 case Opt_journal_dev:
1146 if (is_remount) {
Mingming Cao617ba132006-10-11 01:20:53 -07001147 printk(KERN_ERR "EXT4-fs: cannot specify "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001148 "journal on remount\n");
1149 return 0;
1150 }
1151 if (match_int(&args[0], &option))
1152 return 0;
1153 *journal_devnum = option;
1154 break;
Girish Shilamkar818d2762008-01-28 23:58:27 -05001155 case Opt_journal_checksum:
1156 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1157 break;
1158 case Opt_journal_async_commit:
1159 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
1160 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1161 break;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001162 case Opt_noload:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001163 set_opt(sbi->s_mount_opt, NOLOAD);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001164 break;
1165 case Opt_commit:
1166 if (match_int(&args[0], &option))
1167 return 0;
1168 if (option < 0)
1169 return 0;
1170 if (option == 0)
Mingming Caocd02ff02007-10-16 18:38:25 -04001171 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001172 sbi->s_commit_interval = HZ * option;
1173 break;
1174 case Opt_data_journal:
Mingming Cao617ba132006-10-11 01:20:53 -07001175 data_opt = EXT4_MOUNT_JOURNAL_DATA;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001176 goto datacheck;
1177 case Opt_data_ordered:
Mingming Cao617ba132006-10-11 01:20:53 -07001178 data_opt = EXT4_MOUNT_ORDERED_DATA;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001179 goto datacheck;
1180 case Opt_data_writeback:
Mingming Cao617ba132006-10-11 01:20:53 -07001181 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001182 datacheck:
1183 if (is_remount) {
Mingming Cao617ba132006-10-11 01:20:53 -07001184 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001185 != data_opt) {
1186 printk(KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001187 "EXT4-fs: cannot change data "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001188 "mode on remount\n");
1189 return 0;
1190 }
1191 } else {
Mingming Cao617ba132006-10-11 01:20:53 -07001192 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001193 sbi->s_mount_opt |= data_opt;
1194 }
1195 break;
Hidehiro Kawai5bf56832008-10-10 22:12:43 -04001196 case Opt_data_err_abort:
1197 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1198 break;
1199 case Opt_data_err_ignore:
1200 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1201 break;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001202#ifdef CONFIG_QUOTA
1203 case Opt_usrjquota:
1204 qtype = USRQUOTA;
1205 goto set_qf_name;
1206 case Opt_grpjquota:
1207 qtype = GRPQUOTA;
1208set_qf_name:
Jan Karadfc5d032008-05-13 19:11:51 -04001209 if ((sb_any_quota_enabled(sb) ||
1210 sb_any_quota_suspended(sb)) &&
1211 !sbi->s_qf_names[qtype]) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001212 printk(KERN_ERR
Theodore Ts'o4776004f2008-09-08 23:00:52 -04001213 "EXT4-fs: Cannot change journaled "
1214 "quota options when quota turned on.\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001215 return 0;
1216 }
1217 qname = match_strdup(&args[0]);
1218 if (!qname) {
1219 printk(KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001220 "EXT4-fs: not enough memory for "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001221 "storing quotafile name.\n");
1222 return 0;
1223 }
1224 if (sbi->s_qf_names[qtype] &&
1225 strcmp(sbi->s_qf_names[qtype], qname)) {
1226 printk(KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001227 "EXT4-fs: %s quota file already "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001228 "specified.\n", QTYPE2NAME(qtype));
1229 kfree(qname);
1230 return 0;
1231 }
1232 sbi->s_qf_names[qtype] = qname;
1233 if (strchr(sbi->s_qf_names[qtype], '/')) {
1234 printk(KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001235 "EXT4-fs: quotafile must be on "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001236 "filesystem root.\n");
1237 kfree(sbi->s_qf_names[qtype]);
1238 sbi->s_qf_names[qtype] = NULL;
1239 return 0;
1240 }
1241 set_opt(sbi->s_mount_opt, QUOTA);
1242 break;
1243 case Opt_offusrjquota:
1244 qtype = USRQUOTA;
1245 goto clear_qf_name;
1246 case Opt_offgrpjquota:
1247 qtype = GRPQUOTA;
1248clear_qf_name:
Jan Karadfc5d032008-05-13 19:11:51 -04001249 if ((sb_any_quota_enabled(sb) ||
1250 sb_any_quota_suspended(sb)) &&
1251 sbi->s_qf_names[qtype]) {
Mingming Cao617ba132006-10-11 01:20:53 -07001252 printk(KERN_ERR "EXT4-fs: Cannot change "
Jan Kara2c8be6b2008-05-13 21:27:55 -04001253 "journaled quota options when "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001254 "quota turned on.\n");
1255 return 0;
1256 }
1257 /*
1258 * The space will be released later when all options
1259 * are confirmed to be correct
1260 */
1261 sbi->s_qf_names[qtype] = NULL;
1262 break;
1263 case Opt_jqfmt_vfsold:
Jan Karadfc5d032008-05-13 19:11:51 -04001264 qfmt = QFMT_VFS_OLD;
1265 goto set_qf_format;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001266 case Opt_jqfmt_vfsv0:
Jan Karadfc5d032008-05-13 19:11:51 -04001267 qfmt = QFMT_VFS_V0;
1268set_qf_format:
1269 if ((sb_any_quota_enabled(sb) ||
1270 sb_any_quota_suspended(sb)) &&
1271 sbi->s_jquota_fmt != qfmt) {
1272 printk(KERN_ERR "EXT4-fs: Cannot change "
1273 "journaled quota options when "
1274 "quota turned on.\n");
1275 return 0;
1276 }
1277 sbi->s_jquota_fmt = qfmt;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001278 break;
1279 case Opt_quota:
1280 case Opt_usrquota:
1281 set_opt(sbi->s_mount_opt, QUOTA);
1282 set_opt(sbi->s_mount_opt, USRQUOTA);
1283 break;
1284 case Opt_grpquota:
1285 set_opt(sbi->s_mount_opt, QUOTA);
1286 set_opt(sbi->s_mount_opt, GRPQUOTA);
1287 break;
1288 case Opt_noquota:
1289 if (sb_any_quota_enabled(sb)) {
Mingming Cao617ba132006-10-11 01:20:53 -07001290 printk(KERN_ERR "EXT4-fs: Cannot change quota "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001291 "options when quota turned on.\n");
1292 return 0;
1293 }
1294 clear_opt(sbi->s_mount_opt, QUOTA);
1295 clear_opt(sbi->s_mount_opt, USRQUOTA);
1296 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1297 break;
1298#else
1299 case Opt_quota:
1300 case Opt_usrquota:
1301 case Opt_grpquota:
Jan Karacd59e7b2008-05-13 19:11:51 -04001302 printk(KERN_ERR
1303 "EXT4-fs: quota options not supported.\n");
1304 break;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001305 case Opt_usrjquota:
1306 case Opt_grpjquota:
1307 case Opt_offusrjquota:
1308 case Opt_offgrpjquota:
1309 case Opt_jqfmt_vfsold:
1310 case Opt_jqfmt_vfsv0:
1311 printk(KERN_ERR
Jan Karacd59e7b2008-05-13 19:11:51 -04001312 "EXT4-fs: journaled quota options not "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001313 "supported.\n");
1314 break;
1315 case Opt_noquota:
1316 break;
1317#endif
1318 case Opt_abort:
1319 set_opt(sbi->s_mount_opt, ABORT);
1320 break;
1321 case Opt_barrier:
1322 if (match_int(&args[0], &option))
1323 return 0;
1324 if (option)
1325 set_opt(sbi->s_mount_opt, BARRIER);
1326 else
1327 clear_opt(sbi->s_mount_opt, BARRIER);
1328 break;
1329 case Opt_ignore:
1330 break;
1331 case Opt_resize:
1332 if (!is_remount) {
Mingming Cao617ba132006-10-11 01:20:53 -07001333 printk("EXT4-fs: resize option only available "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001334 "for remount\n");
1335 return 0;
1336 }
1337 if (match_int(&args[0], &option) != 0)
1338 return 0;
1339 *n_blocks_count = option;
1340 break;
1341 case Opt_nobh:
1342 set_opt(sbi->s_mount_opt, NOBH);
1343 break;
1344 case Opt_bh:
1345 clear_opt(sbi->s_mount_opt, NOBH);
1346 break;
Alex Tomasa86c6182006-10-11 01:21:03 -07001347 case Opt_extents:
Eric Sandeene4079a12008-07-11 19:27:31 -04001348 if (!EXT4_HAS_INCOMPAT_FEATURE(sb,
1349 EXT4_FEATURE_INCOMPAT_EXTENTS)) {
1350 ext4_warning(sb, __func__,
1351 "extents feature not enabled "
1352 "on this filesystem, use tune2fs\n");
1353 return 0;
1354 }
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001355 set_opt(sbi->s_mount_opt, EXTENTS);
Alex Tomasa86c6182006-10-11 01:21:03 -07001356 break;
Mingming Cao1e2462f2007-07-18 09:00:55 -04001357 case Opt_noextents:
Aneesh Kumar K.Vc07651b2008-07-11 19:27:31 -04001358 /*
1359 * When e2fsprogs support resizing an already existing
1360 * ext3 file system to greater than 2**32 we need to
1361 * add support to block allocator to handle growing
1362 * already existing block mapped inode so that blocks
1363 * allocated for them fall within 2**32
1364 */
1365 last_block = ext4_blocks_count(sbi->s_es) - 1;
1366 if (last_block > 0xffffffffULL) {
1367 printk(KERN_ERR "EXT4-fs: Filesystem too "
1368 "large to mount with "
1369 "-o noextents options\n");
1370 return 0;
1371 }
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001372 clear_opt(sbi->s_mount_opt, EXTENTS);
Mingming Cao1e2462f2007-07-18 09:00:55 -04001373 break;
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -05001374 case Opt_i_version:
1375 set_opt(sbi->s_mount_opt, I_VERSION);
1376 sb->s_flags |= MS_I_VERSION;
1377 break;
Aneesh Kumar K.Vdd919b92008-07-11 19:27:31 -04001378 case Opt_nodelalloc:
1379 clear_opt(sbi->s_mount_opt, DELALLOC);
1380 break;
Alex Tomasc9de5602008-01-29 00:19:52 -05001381 case Opt_stripe:
1382 if (match_int(&args[0], &option))
1383 return 0;
1384 if (option < 0)
1385 return 0;
1386 sbi->s_stripe = option;
1387 break;
Alex Tomas64769242008-07-11 19:27:31 -04001388 case Opt_delalloc:
1389 set_opt(sbi->s_mount_opt, DELALLOC);
1390 break;
Theodore Ts'o240799c2008-10-09 23:53:47 -04001391 case Opt_inode_readahead_blks:
1392 if (match_int(&args[0], &option))
1393 return 0;
1394 if (option < 0 || option > (1 << 30))
1395 return 0;
1396 sbi->s_inode_readahead_blks = option;
1397 break;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001398 default:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001399 printk(KERN_ERR
1400 "EXT4-fs: Unrecognized mount option \"%s\" "
1401 "or missing value\n", p);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001402 return 0;
1403 }
1404 }
1405#ifdef CONFIG_QUOTA
1406 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
Mingming Cao617ba132006-10-11 01:20:53 -07001407 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001408 sbi->s_qf_names[USRQUOTA])
1409 clear_opt(sbi->s_mount_opt, USRQUOTA);
1410
Mingming Cao617ba132006-10-11 01:20:53 -07001411 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001412 sbi->s_qf_names[GRPQUOTA])
1413 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1414
1415 if ((sbi->s_qf_names[USRQUOTA] &&
Mingming Cao617ba132006-10-11 01:20:53 -07001416 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001417 (sbi->s_qf_names[GRPQUOTA] &&
Mingming Cao617ba132006-10-11 01:20:53 -07001418 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
1419 printk(KERN_ERR "EXT4-fs: old and new quota "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001420 "format mixing.\n");
1421 return 0;
1422 }
1423
1424 if (!sbi->s_jquota_fmt) {
Jan Kara2c8be6b2008-05-13 21:27:55 -04001425 printk(KERN_ERR "EXT4-fs: journaled quota format "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001426 "not specified.\n");
1427 return 0;
1428 }
1429 } else {
1430 if (sbi->s_jquota_fmt) {
Jan Kara2c8be6b2008-05-13 21:27:55 -04001431 printk(KERN_ERR "EXT4-fs: journaled quota format "
1432 "specified with no journaling "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001433 "enabled.\n");
1434 return 0;
1435 }
1436 }
1437#endif
1438 return 1;
1439}
1440
Mingming Cao617ba132006-10-11 01:20:53 -07001441static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001442 int read_only)
1443{
Mingming Cao617ba132006-10-11 01:20:53 -07001444 struct ext4_sb_info *sbi = EXT4_SB(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001445 int res = 0;
1446
Mingming Cao617ba132006-10-11 01:20:53 -07001447 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001448 printk(KERN_ERR "EXT4-fs warning: revision level too high, "
1449 "forcing read-only mode\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001450 res = MS_RDONLY;
1451 }
1452 if (read_only)
1453 return res;
Mingming Cao617ba132006-10-11 01:20:53 -07001454 if (!(sbi->s_mount_state & EXT4_VALID_FS))
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001455 printk(KERN_WARNING "EXT4-fs warning: mounting unchecked fs, "
1456 "running e2fsck is recommended\n");
Mingming Cao617ba132006-10-11 01:20:53 -07001457 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001458 printk(KERN_WARNING
1459 "EXT4-fs warning: mounting fs with errors, "
1460 "running e2fsck is recommended\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001461 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1462 le16_to_cpu(es->s_mnt_count) >=
1463 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001464 printk(KERN_WARNING
1465 "EXT4-fs warning: maximal mount count reached, "
1466 "running e2fsck is recommended\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001467 else if (le32_to_cpu(es->s_checkinterval) &&
1468 (le32_to_cpu(es->s_lastcheck) +
1469 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001470 printk(KERN_WARNING
1471 "EXT4-fs warning: checktime reached, "
1472 "running e2fsck is recommended\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001473#if 0
1474 /* @@@ We _will_ want to clear the valid bit if we find
Andrew Morton63f57932006-10-11 01:21:24 -07001475 * inconsistencies, to force a fsck at reboot. But for
1476 * a plain journaled filesystem we can keep it set as
1477 * valid forever! :)
1478 */
Marcin Slusarz216c34b2008-04-17 10:38:59 -04001479 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001480#endif
1481 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
Mingming Cao617ba132006-10-11 01:20:53 -07001482 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
Marcin Slusarze8546d02008-04-17 10:38:59 -04001483 le16_add_cpu(&es->s_mnt_count, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001484 es->s_mtime = cpu_to_le32(get_seconds());
Mingming Cao617ba132006-10-11 01:20:53 -07001485 ext4_update_dynamic_rev(sb);
1486 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001487
Mingming Cao617ba132006-10-11 01:20:53 -07001488 ext4_commit_super(sb, es, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001489 if (test_opt(sb, DEBUG))
Mingming Cao617ba132006-10-11 01:20:53 -07001490 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001491 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1492 sb->s_blocksize,
1493 sbi->s_groups_count,
Mingming Cao617ba132006-10-11 01:20:53 -07001494 EXT4_BLOCKS_PER_GROUP(sb),
1495 EXT4_INODES_PER_GROUP(sb),
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001496 sbi->s_mount_opt);
1497
Theodore Ts'o05496762008-09-16 14:36:17 -04001498 printk(KERN_INFO "EXT4 FS on %s, %s journal on %s\n",
1499 sb->s_id, EXT4_SB(sb)->s_journal->j_inode ? "internal" :
1500 "external", EXT4_SB(sb)->s_journal->j_devname);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001501 return res;
1502}
1503
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001504static int ext4_fill_flex_info(struct super_block *sb)
1505{
1506 struct ext4_sb_info *sbi = EXT4_SB(sb);
1507 struct ext4_group_desc *gdp = NULL;
1508 struct buffer_head *bh;
1509 ext4_group_t flex_group_count;
1510 ext4_group_t flex_group;
1511 int groups_per_flex = 0;
1512 __u64 block_bitmap = 0;
1513 int i;
1514
1515 if (!sbi->s_es->s_log_groups_per_flex) {
1516 sbi->s_log_groups_per_flex = 0;
1517 return 1;
1518 }
1519
1520 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1521 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1522
Frederic Bohec62a11f2008-09-08 10:20:24 -04001523 /* We allocate both existing and potentially added groups */
1524 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
1525 ((sbi->s_es->s_reserved_gdt_blocks +1 ) <<
1526 EXT4_DESC_PER_BLOCK_BITS(sb))) /
1527 groups_per_flex;
Li Zefanec05e862008-07-24 12:49:59 -04001528 sbi->s_flex_groups = kzalloc(flex_group_count *
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001529 sizeof(struct flex_groups), GFP_KERNEL);
1530 if (sbi->s_flex_groups == NULL) {
Li Zefanec05e862008-07-24 12:49:59 -04001531 printk(KERN_ERR "EXT4-fs: not enough memory for "
1532 "%lu flex groups\n", flex_group_count);
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001533 goto failed;
1534 }
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001535
1536 gdp = ext4_get_group_desc(sb, 1, &bh);
1537 block_bitmap = ext4_block_bitmap(sb, gdp) - 1;
1538
1539 for (i = 0; i < sbi->s_groups_count; i++) {
1540 gdp = ext4_get_group_desc(sb, i, &bh);
1541
1542 flex_group = ext4_flex_group(sbi, i);
1543 sbi->s_flex_groups[flex_group].free_inodes +=
1544 le16_to_cpu(gdp->bg_free_inodes_count);
1545 sbi->s_flex_groups[flex_group].free_blocks +=
1546 le16_to_cpu(gdp->bg_free_blocks_count);
1547 }
1548
1549 return 1;
1550failed:
1551 return 0;
1552}
1553
Andreas Dilger717d50e2007-10-16 18:38:25 -04001554__le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1555 struct ext4_group_desc *gdp)
1556{
1557 __u16 crc = 0;
1558
1559 if (sbi->s_es->s_feature_ro_compat &
1560 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1561 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1562 __le32 le_group = cpu_to_le32(block_group);
1563
1564 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1565 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1566 crc = crc16(crc, (__u8 *)gdp, offset);
1567 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1568 /* for checksum of struct ext4_group_desc do the rest...*/
1569 if ((sbi->s_es->s_feature_incompat &
1570 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1571 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1572 crc = crc16(crc, (__u8 *)gdp + offset,
1573 le16_to_cpu(sbi->s_es->s_desc_size) -
1574 offset);
1575 }
1576
1577 return cpu_to_le16(crc);
1578}
1579
1580int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1581 struct ext4_group_desc *gdp)
1582{
1583 if ((sbi->s_es->s_feature_ro_compat &
1584 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1585 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1586 return 0;
1587
1588 return 1;
1589}
1590
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001591/* Called at mount-time, super-block is locked */
Akinobu Mita197cd65a2008-02-06 01:40:16 -08001592static int ext4_check_descriptors(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001593{
Mingming Cao617ba132006-10-11 01:20:53 -07001594 struct ext4_sb_info *sbi = EXT4_SB(sb);
1595 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1596 ext4_fsblk_t last_block;
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001597 ext4_fsblk_t block_bitmap;
1598 ext4_fsblk_t inode_bitmap;
1599 ext4_fsblk_t inode_table;
Jose R. Santosce421582007-10-16 18:38:25 -04001600 int flexbg_flag = 0;
Avantika Mathurfd2d4292008-01-28 23:58:27 -05001601 ext4_group_t i;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001602
Jose R. Santosce421582007-10-16 18:38:25 -04001603 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1604 flexbg_flag = 1;
1605
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001606 ext4_debug("Checking group descriptors");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001607
Akinobu Mita197cd65a2008-02-06 01:40:16 -08001608 for (i = 0; i < sbi->s_groups_count; i++) {
1609 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1610
Jose R. Santosce421582007-10-16 18:38:25 -04001611 if (i == sbi->s_groups_count - 1 || flexbg_flag)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001612 last_block = ext4_blocks_count(sbi->s_es) - 1;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001613 else
1614 last_block = first_block +
Mingming Cao617ba132006-10-11 01:20:53 -07001615 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001616
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07001617 block_bitmap = ext4_block_bitmap(sb, gdp);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001618 if (block_bitmap < first_block || block_bitmap > last_block) {
Josef Bacikc19204b2008-04-29 22:00:28 -04001619 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1620 "Block bitmap for group %lu not in group "
1621 "(block %llu)!", i, block_bitmap);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001622 return 0;
1623 }
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07001624 inode_bitmap = ext4_inode_bitmap(sb, gdp);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001625 if (inode_bitmap < first_block || inode_bitmap > last_block) {
Josef Bacikc19204b2008-04-29 22:00:28 -04001626 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1627 "Inode bitmap for group %lu not in group "
1628 "(block %llu)!", i, inode_bitmap);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001629 return 0;
1630 }
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07001631 inode_table = ext4_inode_table(sb, gdp);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001632 if (inode_table < first_block ||
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001633 inode_table + sbi->s_itb_per_group - 1 > last_block) {
Josef Bacikc19204b2008-04-29 22:00:28 -04001634 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1635 "Inode table for group %lu not in group "
1636 "(block %llu)!", i, inode_table);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001637 return 0;
1638 }
Eric Sandeenb5f10ee2008-08-02 21:21:08 -04001639 spin_lock(sb_bgl_lock(sbi, i));
Andreas Dilger717d50e2007-10-16 18:38:25 -04001640 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
Josef Bacikc19204b2008-04-29 22:00:28 -04001641 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1642 "Checksum for group %lu failed (%u!=%u)\n",
1643 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
1644 gdp)), le16_to_cpu(gdp->bg_checksum));
Li Zefan7ee1ec42008-09-08 10:47:19 -04001645 if (!(sb->s_flags & MS_RDONLY)) {
1646 spin_unlock(sb_bgl_lock(sbi, i));
Theodore Ts'o8a266462008-07-26 14:34:21 -04001647 return 0;
Li Zefan7ee1ec42008-09-08 10:47:19 -04001648 }
Andreas Dilger717d50e2007-10-16 18:38:25 -04001649 }
Eric Sandeenb5f10ee2008-08-02 21:21:08 -04001650 spin_unlock(sb_bgl_lock(sbi, i));
Jose R. Santosce421582007-10-16 18:38:25 -04001651 if (!flexbg_flag)
1652 first_block += EXT4_BLOCKS_PER_GROUP(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001653 }
1654
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001655 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001656 sbi->s_es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001657 return 1;
1658}
1659
Mingming Cao617ba132006-10-11 01:20:53 -07001660/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001661 * the superblock) which were deleted from all directories, but held open by
1662 * a process at the time of a crash. We walk the list and try to delete these
1663 * inodes at recovery time (only with a read-write filesystem).
1664 *
1665 * In order to keep the orphan inode chain consistent during traversal (in
1666 * case of crash during recovery), we link each inode into the superblock
1667 * orphan list_head and handle it the same way as an inode deletion during
1668 * normal operation (which journals the operations for us).
1669 *
1670 * We only do an iget() and an iput() on each inode, which is very safe if we
1671 * accidentally point at an in-use or already deleted inode. The worst that
1672 * can happen in this case is that we get a "bit already cleared" message from
Mingming Cao617ba132006-10-11 01:20:53 -07001673 * ext4_free_inode(). The only reason we would point at a wrong inode is if
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001674 * e2fsck was run on this filesystem, and it must have already done the orphan
1675 * inode cleanup for us, so we can safely abort without any further action.
1676 */
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001677static void ext4_orphan_cleanup(struct super_block *sb,
1678 struct ext4_super_block *es)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001679{
1680 unsigned int s_flags = sb->s_flags;
1681 int nr_orphans = 0, nr_truncates = 0;
1682#ifdef CONFIG_QUOTA
1683 int i;
1684#endif
1685 if (!es->s_last_orphan) {
1686 jbd_debug(4, "no orphan inodes to clean up\n");
1687 return;
1688 }
1689
Eric Sandeena8f48a92006-12-06 20:40:13 -08001690 if (bdev_read_only(sb->s_bdev)) {
1691 printk(KERN_ERR "EXT4-fs: write access "
1692 "unavailable, skipping orphan cleanup.\n");
1693 return;
1694 }
1695
Mingming Cao617ba132006-10-11 01:20:53 -07001696 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001697 if (es->s_last_orphan)
1698 jbd_debug(1, "Errors on filesystem, "
1699 "clearing orphan list.\n");
1700 es->s_last_orphan = 0;
1701 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1702 return;
1703 }
1704
1705 if (s_flags & MS_RDONLY) {
Mingming Cao617ba132006-10-11 01:20:53 -07001706 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001707 sb->s_id);
1708 sb->s_flags &= ~MS_RDONLY;
1709 }
1710#ifdef CONFIG_QUOTA
1711 /* Needed for iput() to work correctly and not trash data */
1712 sb->s_flags |= MS_ACTIVE;
1713 /* Turn on quotas so that they are updated correctly */
1714 for (i = 0; i < MAXQUOTAS; i++) {
Mingming Cao617ba132006-10-11 01:20:53 -07001715 if (EXT4_SB(sb)->s_qf_names[i]) {
1716 int ret = ext4_quota_on_mount(sb, i);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001717 if (ret < 0)
1718 printk(KERN_ERR
Jan Kara2c8be6b2008-05-13 21:27:55 -04001719 "EXT4-fs: Cannot turn on journaled "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001720 "quota: error %d\n", ret);
1721 }
1722 }
1723#endif
1724
1725 while (es->s_last_orphan) {
1726 struct inode *inode;
1727
Josef Bacik97bd42b2008-04-29 22:04:56 -04001728 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1729 if (IS_ERR(inode)) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001730 es->s_last_orphan = 0;
1731 break;
1732 }
1733
Mingming Cao617ba132006-10-11 01:20:53 -07001734 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001735 DQUOT_INIT(inode);
1736 if (inode->i_nlink) {
1737 printk(KERN_DEBUG
Theodore Ts'oe5f8eab82008-09-08 22:25:04 -04001738 "%s: truncating inode %lu to %lld bytes\n",
Harvey Harrison46e665e2008-04-17 10:38:59 -04001739 __func__, inode->i_ino, inode->i_size);
Theodore Ts'oe5f8eab82008-09-08 22:25:04 -04001740 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001741 inode->i_ino, inode->i_size);
Mingming Cao617ba132006-10-11 01:20:53 -07001742 ext4_truncate(inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001743 nr_truncates++;
1744 } else {
1745 printk(KERN_DEBUG
1746 "%s: deleting unreferenced inode %lu\n",
Harvey Harrison46e665e2008-04-17 10:38:59 -04001747 __func__, inode->i_ino);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001748 jbd_debug(2, "deleting unreferenced inode %lu\n",
1749 inode->i_ino);
1750 nr_orphans++;
1751 }
1752 iput(inode); /* The delete magic happens here! */
1753 }
1754
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001755#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001756
1757 if (nr_orphans)
Mingming Cao617ba132006-10-11 01:20:53 -07001758 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001759 sb->s_id, PLURAL(nr_orphans));
1760 if (nr_truncates)
Mingming Cao617ba132006-10-11 01:20:53 -07001761 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001762 sb->s_id, PLURAL(nr_truncates));
1763#ifdef CONFIG_QUOTA
1764 /* Turn quotas off */
1765 for (i = 0; i < MAXQUOTAS; i++) {
1766 if (sb_dqopt(sb)->files[i])
Jan Kara6f28e082008-04-28 02:14:34 -07001767 vfs_quota_off(sb, i, 0);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001768 }
1769#endif
1770 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1771}
Eric Sandeencd2291a2008-01-28 23:58:27 -05001772/*
1773 * Maximal extent format file size.
1774 * Resulting logical blkno at s_maxbytes must fit in our on-disk
1775 * extent format containers, within a sector_t, and within i_blocks
1776 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
1777 * so that won't be a limiting factor.
1778 *
1779 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1780 */
1781static loff_t ext4_max_size(int blkbits)
1782{
1783 loff_t res;
1784 loff_t upper_limit = MAX_LFS_FILESIZE;
1785
1786 /* small i_blocks in vfs inode? */
1787 if (sizeof(blkcnt_t) < sizeof(u64)) {
1788 /*
1789 * CONFIG_LSF is not enabled implies the inode
1790 * i_block represent total blocks in 512 bytes
1791 * 32 == size of vfs inode i_blocks * 8
1792 */
1793 upper_limit = (1LL << 32) - 1;
1794
1795 /* total blocks in file system block size */
1796 upper_limit >>= (blkbits - 9);
1797 upper_limit <<= blkbits;
1798 }
1799
1800 /* 32-bit extent-start container, ee_block */
1801 res = 1LL << 32;
1802 res <<= blkbits;
1803 res -= 1;
1804
1805 /* Sanity check against vm- & vfs- imposed limits */
1806 if (res > upper_limit)
1807 res = upper_limit;
1808
1809 return res;
1810}
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001811
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001812/*
Eric Sandeencd2291a2008-01-28 23:58:27 -05001813 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001814 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
1815 * We need to be 1 filesystem block less than the 2^48 sector limit.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001816 */
Eric Sandeencd2291a2008-01-28 23:58:27 -05001817static loff_t ext4_max_bitmap_size(int bits)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001818{
Mingming Cao617ba132006-10-11 01:20:53 -07001819 loff_t res = EXT4_NDIR_BLOCKS;
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001820 int meta_blocks;
1821 loff_t upper_limit;
1822 /* This is calculated to be the largest file size for a
Eric Sandeencd2291a2008-01-28 23:58:27 -05001823 * dense, bitmapped file such that the total number of
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001824 * sectors in the file, including data and all indirect blocks,
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001825 * does not exceed 2^48 -1
1826 * __u32 i_blocks_lo and _u16 i_blocks_high representing the
1827 * total number of 512 bytes blocks of the file
1828 */
1829
1830 if (sizeof(blkcnt_t) < sizeof(u64)) {
1831 /*
1832 * CONFIG_LSF is not enabled implies the inode
1833 * i_block represent total blocks in 512 bytes
1834 * 32 == size of vfs inode i_blocks * 8
1835 */
1836 upper_limit = (1LL << 32) - 1;
1837
1838 /* total blocks in file system block size */
1839 upper_limit >>= (bits - 9);
1840
1841 } else {
Aneesh Kumar K.V8180a562008-01-28 23:58:27 -05001842 /*
1843 * We use 48 bit ext4_inode i_blocks
1844 * With EXT4_HUGE_FILE_FL set the i_blocks
1845 * represent total number of blocks in
1846 * file system block size
1847 */
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001848 upper_limit = (1LL << 48) - 1;
1849
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001850 }
1851
1852 /* indirect blocks */
1853 meta_blocks = 1;
1854 /* double indirect blocks */
1855 meta_blocks += 1 + (1LL << (bits-2));
1856 /* tripple indirect blocks */
1857 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1858
1859 upper_limit -= meta_blocks;
1860 upper_limit <<= bits;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001861
1862 res += 1LL << (bits-2);
1863 res += 1LL << (2*(bits-2));
1864 res += 1LL << (3*(bits-2));
1865 res <<= bits;
1866 if (res > upper_limit)
1867 res = upper_limit;
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001868
1869 if (res > MAX_LFS_FILESIZE)
1870 res = MAX_LFS_FILESIZE;
1871
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001872 return res;
1873}
1874
Mingming Cao617ba132006-10-11 01:20:53 -07001875static ext4_fsblk_t descriptor_loc(struct super_block *sb,
Andrew Morton70bbb3e2006-10-11 01:21:20 -07001876 ext4_fsblk_t logical_sb_block, int nr)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001877{
Mingming Cao617ba132006-10-11 01:20:53 -07001878 struct ext4_sb_info *sbi = EXT4_SB(sb);
Avantika Mathurfd2d4292008-01-28 23:58:27 -05001879 ext4_group_t bg, first_meta_bg;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001880 int has_super = 0;
1881
1882 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1883
Mingming Cao617ba132006-10-11 01:20:53 -07001884 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001885 nr < first_meta_bg)
Andrew Morton70bbb3e2006-10-11 01:21:20 -07001886 return logical_sb_block + nr + 1;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001887 bg = sbi->s_desc_per_block * nr;
Mingming Cao617ba132006-10-11 01:20:53 -07001888 if (ext4_bg_has_super(sb, bg))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001889 has_super = 1;
Mingming Cao617ba132006-10-11 01:20:53 -07001890 return (has_super + ext4_group_first_block_no(sb, bg));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001891}
1892
Alex Tomasc9de5602008-01-29 00:19:52 -05001893/**
1894 * ext4_get_stripe_size: Get the stripe size.
1895 * @sbi: In memory super block info
1896 *
1897 * If we have specified it via mount option, then
1898 * use the mount option value. If the value specified at mount time is
1899 * greater than the blocks per group use the super block value.
1900 * If the super block value is greater than blocks per group return 0.
1901 * Allocator needs it be less than blocks per group.
1902 *
1903 */
1904static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
1905{
1906 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
1907 unsigned long stripe_width =
1908 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
1909
1910 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
1911 return sbi->s_stripe;
1912
1913 if (stripe_width <= sbi->s_blocks_per_group)
1914 return stripe_width;
1915
1916 if (stride <= sbi->s_blocks_per_group)
1917 return stride;
1918
1919 return 0;
1920}
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001921
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001922static int ext4_fill_super(struct super_block *sb, void *data, int silent)
Aneesh Kumar K.V74778272008-07-11 19:27:31 -04001923 __releases(kernel_lock)
1924 __acquires(kernel_lock)
Aneesh Kumar K.V1d03ec92008-01-28 23:58:27 -05001925
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001926{
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001927 struct buffer_head *bh;
Mingming Cao617ba132006-10-11 01:20:53 -07001928 struct ext4_super_block *es = NULL;
1929 struct ext4_sb_info *sbi;
1930 ext4_fsblk_t block;
1931 ext4_fsblk_t sb_block = get_sb_block(&data);
Andrew Morton70bbb3e2006-10-11 01:21:20 -07001932 ext4_fsblk_t logical_sb_block;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001933 unsigned long offset = 0;
1934 unsigned int journal_inum = 0;
1935 unsigned long journal_devnum = 0;
1936 unsigned long def_mount_opts;
1937 struct inode *root;
Theodore Ts'o9f6200b2008-09-23 09:18:24 -04001938 char *cp;
David Howells1d1fe1e2008-02-07 00:15:37 -08001939 int ret = -EINVAL;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001940 int blocksize;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001941 int db_count;
1942 int i;
1943 int needs_recovery;
1944 __le32 features;
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001945 __u64 blocks_count;
Peter Zijlstra833f4072007-10-16 23:25:45 -07001946 int err;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001947
1948 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1949 if (!sbi)
1950 return -ENOMEM;
1951 sb->s_fs_info = sbi;
1952 sbi->s_mount_opt = 0;
Mingming Cao617ba132006-10-11 01:20:53 -07001953 sbi->s_resuid = EXT4_DEF_RESUID;
1954 sbi->s_resgid = EXT4_DEF_RESGID;
Theodore Ts'o240799c2008-10-09 23:53:47 -04001955 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
Miklos Szeredid9c9bef12007-10-16 23:26:27 -07001956 sbi->s_sb_block = sb_block;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001957
1958 unlock_kernel();
1959
Theodore Ts'o9f6200b2008-09-23 09:18:24 -04001960 /* Cleanup superblock name */
1961 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
1962 *cp = '!';
1963
Mingming Cao617ba132006-10-11 01:20:53 -07001964 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001965 if (!blocksize) {
Mingming Cao617ba132006-10-11 01:20:53 -07001966 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001967 goto out_fail;
1968 }
1969
1970 /*
Mingming Cao617ba132006-10-11 01:20:53 -07001971 * The ext4 superblock will not be buffer aligned for other than 1kB
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001972 * block sizes. We need to calculate the offset from buffer start.
1973 */
Mingming Cao617ba132006-10-11 01:20:53 -07001974 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
Andrew Morton70bbb3e2006-10-11 01:21:20 -07001975 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1976 offset = do_div(logical_sb_block, blocksize);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001977 } else {
Andrew Morton70bbb3e2006-10-11 01:21:20 -07001978 logical_sb_block = sb_block;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001979 }
1980
Andrew Morton70bbb3e2006-10-11 01:21:20 -07001981 if (!(bh = sb_bread(sb, logical_sb_block))) {
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001982 printk(KERN_ERR "EXT4-fs: unable to read superblock\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001983 goto out_fail;
1984 }
1985 /*
1986 * Note: s_es must be initialized as soon as possible because
Mingming Cao617ba132006-10-11 01:20:53 -07001987 * some ext4 macro-instructions depend on its value
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001988 */
Mingming Cao617ba132006-10-11 01:20:53 -07001989 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001990 sbi->s_es = es;
1991 sb->s_magic = le16_to_cpu(es->s_magic);
Mingming Cao617ba132006-10-11 01:20:53 -07001992 if (sb->s_magic != EXT4_SUPER_MAGIC)
1993 goto cantfind_ext4;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001994
1995 /* Set defaults before we parse the mount options */
1996 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
Mingming Cao617ba132006-10-11 01:20:53 -07001997 if (def_mount_opts & EXT4_DEFM_DEBUG)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001998 set_opt(sbi->s_mount_opt, DEBUG);
Mingming Cao617ba132006-10-11 01:20:53 -07001999 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002000 set_opt(sbi->s_mount_opt, GRPID);
Mingming Cao617ba132006-10-11 01:20:53 -07002001 if (def_mount_opts & EXT4_DEFM_UID16)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002002 set_opt(sbi->s_mount_opt, NO_UID32);
Theodore Ts'o03010a32008-10-10 20:02:48 -04002003#ifdef CONFIG_EXT4_FS_XATTR
Mingming Cao617ba132006-10-11 01:20:53 -07002004 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002005 set_opt(sbi->s_mount_opt, XATTR_USER);
Hugh Dickins2e7842b2007-02-10 01:46:13 -08002006#endif
Theodore Ts'o03010a32008-10-10 20:02:48 -04002007#ifdef CONFIG_EXT4_FS_POSIX_ACL
Mingming Cao617ba132006-10-11 01:20:53 -07002008 if (def_mount_opts & EXT4_DEFM_ACL)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002009 set_opt(sbi->s_mount_opt, POSIX_ACL);
Hugh Dickins2e7842b2007-02-10 01:46:13 -08002010#endif
Mingming Cao617ba132006-10-11 01:20:53 -07002011 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
2012 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
2013 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
2014 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
2015 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
2016 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002017
Mingming Cao617ba132006-10-11 01:20:53 -07002018 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002019 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
Aneesh Kumar K.Vbb4f3972008-01-28 23:58:26 -05002020 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
Dmitry Mishinceea16b2006-10-11 01:21:21 -07002021 set_opt(sbi->s_mount_opt, ERRORS_CONT);
Aneesh Kumar K.Vbb4f3972008-01-28 23:58:26 -05002022 else
2023 set_opt(sbi->s_mount_opt, ERRORS_RO);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002024
2025 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
2026 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
2027
2028 set_opt(sbi->s_mount_opt, RESERVATION);
Eric Sandeen571640c2008-05-26 12:29:46 -04002029 set_opt(sbi->s_mount_opt, BARRIER);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002030
Mingming Cao1e2462f2007-07-18 09:00:55 -04002031 /*
2032 * turn on extents feature by default in ext4 filesystem
Eric Sandeene4079a12008-07-11 19:27:31 -04002033 * only if feature flag already set by mkfs or tune2fs.
2034 * Use -o noextents to turn it off
Mingming Cao1e2462f2007-07-18 09:00:55 -04002035 */
Eric Sandeene4079a12008-07-11 19:27:31 -04002036 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS))
2037 set_opt(sbi->s_mount_opt, EXTENTS);
2038 else
2039 ext4_warning(sb, __func__,
2040 "extents feature not enabled on this filesystem, "
2041 "use tune2fs.\n");
Mingming Cao1e2462f2007-07-18 09:00:55 -04002042
Aneesh Kumar K.Vdd919b92008-07-11 19:27:31 -04002043 /*
2044 * enable delayed allocation by default
2045 * Use -o nodelalloc to turn it off
2046 */
2047 set_opt(sbi->s_mount_opt, DELALLOC);
2048
2049
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002050 if (!parse_options((char *) data, sb, &journal_inum, &journal_devnum,
2051 NULL, 0))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002052 goto failed_mount;
2053
2054 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
Mingming Cao617ba132006-10-11 01:20:53 -07002055 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002056
Mingming Cao617ba132006-10-11 01:20:53 -07002057 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
2058 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
2059 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
2060 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002061 printk(KERN_WARNING
Mingming Cao617ba132006-10-11 01:20:53 -07002062 "EXT4-fs warning: feature flags set on rev 0 fs, "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002063 "running e2fsck is recommended\n");
Theodore Tso469108f2008-02-10 01:11:44 -05002064
2065 /*
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002066 * Check feature flags regardless of the revision level, since we
2067 * previously didn't change the revision level when setting the flags,
2068 * so there is a chance incompat flags are set on a rev 0 filesystem.
2069 */
Mingming Cao617ba132006-10-11 01:20:53 -07002070 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002071 if (features) {
Mingming Cao617ba132006-10-11 01:20:53 -07002072 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002073 "unsupported optional features (%x).\n",
2074 sb->s_id, le32_to_cpu(features));
2075 goto failed_mount;
2076 }
Mingming Cao617ba132006-10-11 01:20:53 -07002077 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002078 if (!(sb->s_flags & MS_RDONLY) && features) {
Mingming Cao617ba132006-10-11 01:20:53 -07002079 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002080 "unsupported optional features (%x).\n",
2081 sb->s_id, le32_to_cpu(features));
2082 goto failed_mount;
2083 }
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05002084 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2085 /*
2086 * Large file size enabled file system can only be
2087 * mount if kernel is build with CONFIG_LSF
2088 */
2089 if (sizeof(root->i_blocks) < sizeof(u64) &&
2090 !(sb->s_flags & MS_RDONLY)) {
2091 printk(KERN_ERR "EXT4-fs: %s: Filesystem with huge "
2092 "files cannot be mounted read-write "
2093 "without CONFIG_LSF.\n", sb->s_id);
2094 goto failed_mount;
2095 }
2096 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002097 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
2098
Mingming Cao617ba132006-10-11 01:20:53 -07002099 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
2100 blocksize > EXT4_MAX_BLOCK_SIZE) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002101 printk(KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07002102 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002103 blocksize, sb->s_id);
2104 goto failed_mount;
2105 }
2106
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002107 if (sb->s_blocksize != blocksize) {
Aneesh Kumar K.Vce407332008-01-28 23:58:27 -05002108
2109 /* Validate the filesystem blocksize */
2110 if (!sb_set_blocksize(sb, blocksize)) {
2111 printk(KERN_ERR "EXT4-fs: bad block size %d.\n",
2112 blocksize);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002113 goto failed_mount;
2114 }
2115
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002116 brelse(bh);
Andrew Morton70bbb3e2006-10-11 01:21:20 -07002117 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2118 offset = do_div(logical_sb_block, blocksize);
2119 bh = sb_bread(sb, logical_sb_block);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002120 if (!bh) {
2121 printk(KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07002122 "EXT4-fs: Can't read superblock on 2nd try.\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002123 goto failed_mount;
2124 }
Mingming Cao617ba132006-10-11 01:20:53 -07002125 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002126 sbi->s_es = es;
Mingming Cao617ba132006-10-11 01:20:53 -07002127 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002128 printk(KERN_ERR
2129 "EXT4-fs: Magic mismatch, very weird !\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002130 goto failed_mount;
2131 }
2132 }
2133
Eric Sandeene2b46572008-01-28 23:58:27 -05002134 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits);
Mingming Cao617ba132006-10-11 01:20:53 -07002135 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002136
Mingming Cao617ba132006-10-11 01:20:53 -07002137 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
2138 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
2139 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002140 } else {
2141 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
2142 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
Mingming Cao617ba132006-10-11 01:20:53 -07002143 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
Vignesh Babu13305932007-07-18 09:11:02 -04002144 (!is_power_of_2(sbi->s_inode_size)) ||
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002145 (sbi->s_inode_size > blocksize)) {
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002146 printk(KERN_ERR
2147 "EXT4-fs: unsupported inode size: %d\n",
2148 sbi->s_inode_size);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002149 goto failed_mount;
2150 }
Kalpak Shahef7f3832007-07-18 09:15:20 -04002151 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
2152 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002153 }
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07002154 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
2155 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07002156 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07002157 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
vignesh babud8ea6cf2007-10-16 23:27:14 -07002158 !is_power_of_2(sbi->s_desc_size)) {
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07002159 printk(KERN_ERR
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07002160 "EXT4-fs: unsupported descriptor size %lu\n",
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07002161 sbi->s_desc_size);
2162 goto failed_mount;
2163 }
2164 } else
2165 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002166 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002167 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
Andries E. Brouwerb47b6f32007-12-17 16:19:55 -08002168 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
Mingming Cao617ba132006-10-11 01:20:53 -07002169 goto cantfind_ext4;
2170 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002171 if (sbi->s_inodes_per_block == 0)
Mingming Cao617ba132006-10-11 01:20:53 -07002172 goto cantfind_ext4;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002173 sbi->s_itb_per_group = sbi->s_inodes_per_group /
2174 sbi->s_inodes_per_block;
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07002175 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002176 sbi->s_sbh = bh;
2177 sbi->s_mount_state = le16_to_cpu(es->s_state);
Fengguang Wue57aa832007-10-16 23:26:25 -07002178 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
2179 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002180 for (i = 0; i < 4; i++)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002181 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
2182 sbi->s_def_hash_version = es->s_def_hash_version;
2183
2184 if (sbi->s_blocks_per_group > blocksize * 8) {
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002185 printk(KERN_ERR
2186 "EXT4-fs: #blocks per group too big: %lu\n",
2187 sbi->s_blocks_per_group);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002188 goto failed_mount;
2189 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002190 if (sbi->s_inodes_per_group > blocksize * 8) {
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002191 printk(KERN_ERR
2192 "EXT4-fs: #inodes per group too big: %lu\n",
2193 sbi->s_inodes_per_group);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002194 goto failed_mount;
2195 }
2196
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002197 if (ext4_blocks_count(es) >
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002198 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
Mingming Cao617ba132006-10-11 01:20:53 -07002199 printk(KERN_ERR "EXT4-fs: filesystem on %s:"
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002200 " too large to mount safely\n", sb->s_id);
2201 if (sizeof(sector_t) < 8)
Mingming Cao617ba132006-10-11 01:20:53 -07002202 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002203 "enabled\n");
2204 goto failed_mount;
2205 }
2206
Mingming Cao617ba132006-10-11 01:20:53 -07002207 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
2208 goto cantfind_ext4;
Eric Sandeene7c95592008-01-28 23:58:27 -05002209
2210 /* ensure blocks_count calculation below doesn't sign-extend */
2211 if (ext4_blocks_count(es) + EXT4_BLOCKS_PER_GROUP(sb) <
2212 le32_to_cpu(es->s_first_data_block) + 1) {
2213 printk(KERN_WARNING "EXT4-fs: bad geometry: block count %llu, "
2214 "first data block %u, blocks per group %lu\n",
2215 ext4_blocks_count(es),
2216 le32_to_cpu(es->s_first_data_block),
2217 EXT4_BLOCKS_PER_GROUP(sb));
2218 goto failed_mount;
2219 }
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002220 blocks_count = (ext4_blocks_count(es) -
2221 le32_to_cpu(es->s_first_data_block) +
2222 EXT4_BLOCKS_PER_GROUP(sb) - 1);
2223 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
2224 sbi->s_groups_count = blocks_count;
Mingming Cao617ba132006-10-11 01:20:53 -07002225 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
2226 EXT4_DESC_PER_BLOCK(sb);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002227 sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *),
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002228 GFP_KERNEL);
2229 if (sbi->s_group_desc == NULL) {
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002230 printk(KERN_ERR "EXT4-fs: not enough memory\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002231 goto failed_mount;
2232 }
2233
Alexander Beregalov3244fcb2008-10-12 17:27:49 -04002234#ifdef CONFIG_PROC_FS
Theodore Ts'o9f6200b2008-09-23 09:18:24 -04002235 if (ext4_proc_root)
2236 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
2237
Theodore Ts'o240799c2008-10-09 23:53:47 -04002238 if (sbi->s_proc)
2239 proc_create_data("inode_readahead_blks", 0644, sbi->s_proc,
2240 &ext4_ui_proc_fops,
2241 &sbi->s_inode_readahead_blks);
Alexander Beregalov3244fcb2008-10-12 17:27:49 -04002242#endif
Theodore Ts'o240799c2008-10-09 23:53:47 -04002243
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002244 bgl_lock_init(&sbi->s_blockgroup_lock);
2245
2246 for (i = 0; i < db_count; i++) {
Andrew Morton70bbb3e2006-10-11 01:21:20 -07002247 block = descriptor_loc(sb, logical_sb_block, i);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002248 sbi->s_group_desc[i] = sb_bread(sb, block);
2249 if (!sbi->s_group_desc[i]) {
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002250 printk(KERN_ERR "EXT4-fs: "
2251 "can't read group descriptor %d\n", i);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002252 db_count = i;
2253 goto failed_mount2;
2254 }
2255 }
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002256 if (!ext4_check_descriptors(sb)) {
Mingming Cao617ba132006-10-11 01:20:53 -07002257 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002258 goto failed_mount2;
2259 }
Jose R. Santos772cb7c2008-07-11 19:27:31 -04002260 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2261 if (!ext4_fill_flex_info(sb)) {
2262 printk(KERN_ERR
2263 "EXT4-fs: unable to initialize "
2264 "flex_bg meta info!\n");
2265 goto failed_mount2;
2266 }
2267
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002268 sbi->s_gdb_count = db_count;
2269 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
2270 spin_lock_init(&sbi->s_next_gen_lock);
2271
Peter Zijlstra833f4072007-10-16 23:25:45 -07002272 err = percpu_counter_init(&sbi->s_freeblocks_counter,
2273 ext4_count_free_blocks(sb));
2274 if (!err) {
2275 err = percpu_counter_init(&sbi->s_freeinodes_counter,
2276 ext4_count_free_inodes(sb));
2277 }
2278 if (!err) {
2279 err = percpu_counter_init(&sbi->s_dirs_counter,
2280 ext4_count_dirs(sb));
2281 }
Aneesh Kumar K.V6bc6e632008-10-10 09:39:00 -04002282 if (!err) {
2283 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
2284 }
Peter Zijlstra833f4072007-10-16 23:25:45 -07002285 if (err) {
2286 printk(KERN_ERR "EXT4-fs: insufficient memory\n");
2287 goto failed_mount3;
2288 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002289
Alex Tomasc9de5602008-01-29 00:19:52 -05002290 sbi->s_stripe = ext4_get_stripe_size(sbi);
2291
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002292 /*
2293 * set up enough so that it can read an inode
2294 */
Mingming Cao617ba132006-10-11 01:20:53 -07002295 sb->s_op = &ext4_sops;
2296 sb->s_export_op = &ext4_export_ops;
2297 sb->s_xattr = ext4_xattr_handlers;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002298#ifdef CONFIG_QUOTA
Mingming Cao617ba132006-10-11 01:20:53 -07002299 sb->s_qcop = &ext4_qctl_operations;
2300 sb->dq_op = &ext4_quota_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002301#endif
2302 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
2303
2304 sb->s_root = NULL;
2305
2306 needs_recovery = (es->s_last_orphan != 0 ||
Mingming Cao617ba132006-10-11 01:20:53 -07002307 EXT4_HAS_INCOMPAT_FEATURE(sb,
2308 EXT4_FEATURE_INCOMPAT_RECOVER));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002309
2310 /*
2311 * The first inode we look at is the journal inode. Don't try
2312 * root first: it may be modified in the journal!
2313 */
2314 if (!test_opt(sb, NOLOAD) &&
Mingming Cao617ba132006-10-11 01:20:53 -07002315 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
2316 if (ext4_load_journal(sb, es, journal_devnum))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002317 goto failed_mount3;
Theodore Ts'o624080e2008-06-06 17:50:40 -04002318 if (!(sb->s_flags & MS_RDONLY) &&
2319 EXT4_SB(sb)->s_journal->j_failed_commit) {
2320 printk(KERN_CRIT "EXT4-fs error (device %s): "
2321 "ext4_fill_super: Journal transaction "
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002322 "%u is corrupt\n", sb->s_id,
Theodore Ts'o624080e2008-06-06 17:50:40 -04002323 EXT4_SB(sb)->s_journal->j_failed_commit);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002324 if (test_opt(sb, ERRORS_RO)) {
2325 printk(KERN_CRIT
2326 "Mounting filesystem read-only\n");
Theodore Ts'o624080e2008-06-06 17:50:40 -04002327 sb->s_flags |= MS_RDONLY;
2328 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2329 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2330 }
2331 if (test_opt(sb, ERRORS_PANIC)) {
2332 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2333 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2334 ext4_commit_super(sb, es, 1);
2335 printk(KERN_CRIT
2336 "EXT4-fs (device %s): mount failed\n",
2337 sb->s_id);
2338 goto failed_mount4;
2339 }
2340 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002341 } else if (journal_inum) {
Mingming Cao617ba132006-10-11 01:20:53 -07002342 if (ext4_create_journal(sb, es, journal_inum))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002343 goto failed_mount3;
2344 } else {
2345 if (!silent)
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002346 printk(KERN_ERR
2347 "ext4: No journal on filesystem on %s\n",
2348 sb->s_id);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002349 goto failed_mount3;
2350 }
2351
Jose R. Santoseb40a092007-07-18 08:37:25 -04002352 if (ext4_blocks_count(es) > 0xffffffffULL &&
2353 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
2354 JBD2_FEATURE_INCOMPAT_64BIT)) {
2355 printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n");
2356 goto failed_mount4;
2357 }
2358
Girish Shilamkar818d2762008-01-28 23:58:27 -05002359 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2360 jbd2_journal_set_features(sbi->s_journal,
2361 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2362 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2363 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2364 jbd2_journal_set_features(sbi->s_journal,
2365 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
2366 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2367 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2368 } else {
2369 jbd2_journal_clear_features(sbi->s_journal,
2370 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2371 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2372 }
2373
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002374 /* We have now updated the journal if required, so we can
2375 * validate the data journaling mode. */
2376 switch (test_opt(sb, DATA_FLAGS)) {
2377 case 0:
2378 /* No mode set, assume a default based on the journal
Andrew Morton63f57932006-10-11 01:21:24 -07002379 * capabilities: ORDERED_DATA if the journal can
2380 * cope, else JOURNAL_DATA
2381 */
Mingming Caodab291a2006-10-11 01:21:01 -07002382 if (jbd2_journal_check_available_features
2383 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002384 set_opt(sbi->s_mount_opt, ORDERED_DATA);
2385 else
2386 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2387 break;
2388
Mingming Cao617ba132006-10-11 01:20:53 -07002389 case EXT4_MOUNT_ORDERED_DATA:
2390 case EXT4_MOUNT_WRITEBACK_DATA:
Mingming Caodab291a2006-10-11 01:21:01 -07002391 if (!jbd2_journal_check_available_features
2392 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
Mingming Cao617ba132006-10-11 01:20:53 -07002393 printk(KERN_ERR "EXT4-fs: Journal does not support "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002394 "requested data journaling mode\n");
2395 goto failed_mount4;
2396 }
2397 default:
2398 break;
2399 }
2400
2401 if (test_opt(sb, NOBH)) {
Mingming Cao617ba132006-10-11 01:20:53 -07002402 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
2403 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002404 "its supported only with writeback mode\n");
2405 clear_opt(sbi->s_mount_opt, NOBH);
2406 }
2407 }
2408 /*
Mingming Caodab291a2006-10-11 01:21:01 -07002409 * The jbd2_journal_load will have done any necessary log recovery,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002410 * so we can safely mount the rest of the filesystem now.
2411 */
2412
David Howells1d1fe1e2008-02-07 00:15:37 -08002413 root = ext4_iget(sb, EXT4_ROOT_INO);
2414 if (IS_ERR(root)) {
Mingming Cao617ba132006-10-11 01:20:53 -07002415 printk(KERN_ERR "EXT4-fs: get root inode failed\n");
David Howells1d1fe1e2008-02-07 00:15:37 -08002416 ret = PTR_ERR(root);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002417 goto failed_mount4;
2418 }
2419 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
David Howells1d1fe1e2008-02-07 00:15:37 -08002420 iput(root);
Mingming Cao617ba132006-10-11 01:20:53 -07002421 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002422 goto failed_mount4;
2423 }
David Howells1d1fe1e2008-02-07 00:15:37 -08002424 sb->s_root = d_alloc_root(root);
2425 if (!sb->s_root) {
2426 printk(KERN_ERR "EXT4-fs: get root dentry failed\n");
2427 iput(root);
2428 ret = -ENOMEM;
2429 goto failed_mount4;
2430 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002431
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002432 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
Kalpak Shahef7f3832007-07-18 09:15:20 -04002433
2434 /* determine the minimum size of new large inodes, if present */
2435 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
2436 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2437 EXT4_GOOD_OLD_INODE_SIZE;
2438 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2439 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2440 if (sbi->s_want_extra_isize <
2441 le16_to_cpu(es->s_want_extra_isize))
2442 sbi->s_want_extra_isize =
2443 le16_to_cpu(es->s_want_extra_isize);
2444 if (sbi->s_want_extra_isize <
2445 le16_to_cpu(es->s_min_extra_isize))
2446 sbi->s_want_extra_isize =
2447 le16_to_cpu(es->s_min_extra_isize);
2448 }
2449 }
2450 /* Check if enough inode space is available */
2451 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2452 sbi->s_inode_size) {
2453 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2454 EXT4_GOOD_OLD_INODE_SIZE;
2455 printk(KERN_INFO "EXT4-fs: required extra inode space not"
2456 "available.\n");
2457 }
2458
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002459 /*
2460 * akpm: core read_super() calls in here with the superblock locked.
2461 * That deadlocks, because orphan cleanup needs to lock the superblock
2462 * in numerous places. Here we just pop the lock - it's relatively
2463 * harmless, because we are now ready to accept write_super() requests,
2464 * and aviro says that's the only reason for hanging onto the
2465 * superblock lock.
2466 */
Mingming Cao617ba132006-10-11 01:20:53 -07002467 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
2468 ext4_orphan_cleanup(sb, es);
2469 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002470 if (needs_recovery)
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002471 printk(KERN_INFO "EXT4-fs: recovery complete.\n");
Mingming Cao617ba132006-10-11 01:20:53 -07002472 ext4_mark_recovery_complete(sb, es);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002473 printk(KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n",
2474 test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal":
2475 test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered":
2476 "writeback");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002477
Aneesh Kumar K.Vdd919b92008-07-11 19:27:31 -04002478 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
2479 printk(KERN_WARNING "EXT4-fs: Ignoring delalloc option - "
2480 "requested data journaling mode\n");
2481 clear_opt(sbi->s_mount_opt, DELALLOC);
2482 } else if (test_opt(sb, DELALLOC))
2483 printk(KERN_INFO "EXT4-fs: delayed allocation enabled\n");
2484
Alex Tomasa86c6182006-10-11 01:21:03 -07002485 ext4_ext_init(sb);
Theodore Ts'oc2ea3fd2008-10-10 09:40:52 -04002486 err = ext4_mb_init(sb, needs_recovery);
2487 if (err) {
2488 printk(KERN_ERR "EXT4-fs: failed to initalize mballoc (%d)\n",
2489 err);
2490 goto failed_mount4;
2491 }
Alex Tomasa86c6182006-10-11 01:21:03 -07002492
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002493 lock_kernel();
2494 return 0;
2495
Mingming Cao617ba132006-10-11 01:20:53 -07002496cantfind_ext4:
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002497 if (!silent)
Mingming Cao617ba132006-10-11 01:20:53 -07002498 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002499 sb->s_id);
2500 goto failed_mount;
2501
2502failed_mount4:
Mingming Caodab291a2006-10-11 01:21:01 -07002503 jbd2_journal_destroy(sbi->s_journal);
Jan Kara47b4a502008-07-11 19:27:31 -04002504 sbi->s_journal = NULL;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002505failed_mount3:
2506 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2507 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2508 percpu_counter_destroy(&sbi->s_dirs_counter);
Aneesh Kumar K.V6bc6e632008-10-10 09:39:00 -04002509 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002510failed_mount2:
2511 for (i = 0; i < db_count; i++)
2512 brelse(sbi->s_group_desc[i]);
2513 kfree(sbi->s_group_desc);
2514failed_mount:
Theodore Ts'o240799c2008-10-09 23:53:47 -04002515 if (sbi->s_proc) {
2516 remove_proc_entry("inode_readahead_blks", sbi->s_proc);
Theodore Ts'o9f6200b2008-09-23 09:18:24 -04002517 remove_proc_entry(sb->s_id, ext4_proc_root);
Theodore Ts'o240799c2008-10-09 23:53:47 -04002518 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002519#ifdef CONFIG_QUOTA
2520 for (i = 0; i < MAXQUOTAS; i++)
2521 kfree(sbi->s_qf_names[i]);
2522#endif
Mingming Cao617ba132006-10-11 01:20:53 -07002523 ext4_blkdev_remove(sbi);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002524 brelse(bh);
2525out_fail:
2526 sb->s_fs_info = NULL;
2527 kfree(sbi);
2528 lock_kernel();
David Howells1d1fe1e2008-02-07 00:15:37 -08002529 return ret;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002530}
2531
2532/*
2533 * Setup any per-fs journal parameters now. We'll do this both on
2534 * initial mount, once the journal has been initialised but before we've
2535 * done any recovery; and again on any subsequent remount.
2536 */
Mingming Cao617ba132006-10-11 01:20:53 -07002537static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002538{
Mingming Cao617ba132006-10-11 01:20:53 -07002539 struct ext4_sb_info *sbi = EXT4_SB(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002540
2541 if (sbi->s_commit_interval)
2542 journal->j_commit_interval = sbi->s_commit_interval;
Mingming Cao617ba132006-10-11 01:20:53 -07002543 /* We could also set up an ext4-specific default for the commit
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002544 * interval here, but for now we'll just fall back to the jbd
2545 * default. */
2546
2547 spin_lock(&journal->j_state_lock);
2548 if (test_opt(sb, BARRIER))
Mingming Caodab291a2006-10-11 01:21:01 -07002549 journal->j_flags |= JBD2_BARRIER;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002550 else
Mingming Caodab291a2006-10-11 01:21:01 -07002551 journal->j_flags &= ~JBD2_BARRIER;
Hidehiro Kawai5bf56832008-10-10 22:12:43 -04002552 if (test_opt(sb, DATA_ERR_ABORT))
2553 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
2554 else
2555 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002556 spin_unlock(&journal->j_state_lock);
2557}
2558
Mingming Cao617ba132006-10-11 01:20:53 -07002559static journal_t *ext4_get_journal(struct super_block *sb,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002560 unsigned int journal_inum)
2561{
2562 struct inode *journal_inode;
2563 journal_t *journal;
2564
2565 /* First, test for the existence of a valid inode on disk. Bad
2566 * things happen if we iget() an unused inode, as the subsequent
2567 * iput() will try to delete it. */
2568
David Howells1d1fe1e2008-02-07 00:15:37 -08002569 journal_inode = ext4_iget(sb, journal_inum);
2570 if (IS_ERR(journal_inode)) {
Mingming Cao617ba132006-10-11 01:20:53 -07002571 printk(KERN_ERR "EXT4-fs: no journal found.\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002572 return NULL;
2573 }
2574 if (!journal_inode->i_nlink) {
2575 make_bad_inode(journal_inode);
2576 iput(journal_inode);
Mingming Cao617ba132006-10-11 01:20:53 -07002577 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002578 return NULL;
2579 }
2580
Theodore Ts'oe5f8eab82008-09-08 22:25:04 -04002581 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002582 journal_inode, journal_inode->i_size);
David Howells1d1fe1e2008-02-07 00:15:37 -08002583 if (!S_ISREG(journal_inode->i_mode)) {
Mingming Cao617ba132006-10-11 01:20:53 -07002584 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002585 iput(journal_inode);
2586 return NULL;
2587 }
2588
Mingming Caodab291a2006-10-11 01:21:01 -07002589 journal = jbd2_journal_init_inode(journal_inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002590 if (!journal) {
Mingming Cao617ba132006-10-11 01:20:53 -07002591 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002592 iput(journal_inode);
2593 return NULL;
2594 }
2595 journal->j_private = sb;
Mingming Cao617ba132006-10-11 01:20:53 -07002596 ext4_init_journal_params(sb, journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002597 return journal;
2598}
2599
Mingming Cao617ba132006-10-11 01:20:53 -07002600static journal_t *ext4_get_dev_journal(struct super_block *sb,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002601 dev_t j_dev)
2602{
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002603 struct buffer_head *bh;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002604 journal_t *journal;
Mingming Cao617ba132006-10-11 01:20:53 -07002605 ext4_fsblk_t start;
2606 ext4_fsblk_t len;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002607 int hblock, blocksize;
Mingming Cao617ba132006-10-11 01:20:53 -07002608 ext4_fsblk_t sb_block;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002609 unsigned long offset;
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002610 struct ext4_super_block *es;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002611 struct block_device *bdev;
2612
Mingming Cao617ba132006-10-11 01:20:53 -07002613 bdev = ext4_blkdev_get(j_dev);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002614 if (bdev == NULL)
2615 return NULL;
2616
2617 if (bd_claim(bdev, sb)) {
2618 printk(KERN_ERR
Dave Kleikamp8c55e202007-05-24 13:04:54 -04002619 "EXT4: failed to claim external journal device.\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002620 blkdev_put(bdev);
2621 return NULL;
2622 }
2623
2624 blocksize = sb->s_blocksize;
2625 hblock = bdev_hardsect_size(bdev);
2626 if (blocksize < hblock) {
2627 printk(KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07002628 "EXT4-fs: blocksize too small for journal device.\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002629 goto out_bdev;
2630 }
2631
Mingming Cao617ba132006-10-11 01:20:53 -07002632 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
2633 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002634 set_blocksize(bdev, blocksize);
2635 if (!(bh = __bread(bdev, sb_block, blocksize))) {
Mingming Cao617ba132006-10-11 01:20:53 -07002636 printk(KERN_ERR "EXT4-fs: couldn't read superblock of "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002637 "external journal\n");
2638 goto out_bdev;
2639 }
2640
Mingming Cao617ba132006-10-11 01:20:53 -07002641 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2642 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002643 !(le32_to_cpu(es->s_feature_incompat) &
Mingming Cao617ba132006-10-11 01:20:53 -07002644 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2645 printk(KERN_ERR "EXT4-fs: external journal has "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002646 "bad superblock\n");
2647 brelse(bh);
2648 goto out_bdev;
2649 }
2650
Mingming Cao617ba132006-10-11 01:20:53 -07002651 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2652 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002653 brelse(bh);
2654 goto out_bdev;
2655 }
2656
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002657 len = ext4_blocks_count(es);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002658 start = sb_block + 1;
2659 brelse(bh); /* we're done with the superblock */
2660
Mingming Caodab291a2006-10-11 01:21:01 -07002661 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002662 start, len, blocksize);
2663 if (!journal) {
Mingming Cao617ba132006-10-11 01:20:53 -07002664 printk(KERN_ERR "EXT4-fs: failed to create device journal\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002665 goto out_bdev;
2666 }
2667 journal->j_private = sb;
2668 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2669 wait_on_buffer(journal->j_sb_buffer);
2670 if (!buffer_uptodate(journal->j_sb_buffer)) {
Mingming Cao617ba132006-10-11 01:20:53 -07002671 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002672 goto out_journal;
2673 }
2674 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
Mingming Cao617ba132006-10-11 01:20:53 -07002675 printk(KERN_ERR "EXT4-fs: External journal has more than one "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002676 "user (unsupported) - %d\n",
2677 be32_to_cpu(journal->j_superblock->s_nr_users));
2678 goto out_journal;
2679 }
Mingming Cao617ba132006-10-11 01:20:53 -07002680 EXT4_SB(sb)->journal_bdev = bdev;
2681 ext4_init_journal_params(sb, journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002682 return journal;
2683out_journal:
Mingming Caodab291a2006-10-11 01:21:01 -07002684 jbd2_journal_destroy(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002685out_bdev:
Mingming Cao617ba132006-10-11 01:20:53 -07002686 ext4_blkdev_put(bdev);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002687 return NULL;
2688}
2689
Mingming Cao617ba132006-10-11 01:20:53 -07002690static int ext4_load_journal(struct super_block *sb,
2691 struct ext4_super_block *es,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002692 unsigned long journal_devnum)
2693{
2694 journal_t *journal;
2695 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2696 dev_t journal_dev;
2697 int err = 0;
2698 int really_read_only;
2699
2700 if (journal_devnum &&
2701 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
Mingming Cao617ba132006-10-11 01:20:53 -07002702 printk(KERN_INFO "EXT4-fs: external journal device major/minor "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002703 "numbers have changed\n");
2704 journal_dev = new_decode_dev(journal_devnum);
2705 } else
2706 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2707
2708 really_read_only = bdev_read_only(sb->s_bdev);
2709
2710 /*
2711 * Are we loading a blank journal or performing recovery after a
2712 * crash? For recovery, we need to check in advance whether we
2713 * can get read-write access to the device.
2714 */
2715
Mingming Cao617ba132006-10-11 01:20:53 -07002716 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002717 if (sb->s_flags & MS_RDONLY) {
Mingming Cao617ba132006-10-11 01:20:53 -07002718 printk(KERN_INFO "EXT4-fs: INFO: recovery "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002719 "required on readonly filesystem.\n");
2720 if (really_read_only) {
Mingming Cao617ba132006-10-11 01:20:53 -07002721 printk(KERN_ERR "EXT4-fs: write access "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002722 "unavailable, cannot proceed.\n");
2723 return -EROFS;
2724 }
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002725 printk(KERN_INFO "EXT4-fs: write access will "
2726 "be enabled during recovery.\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002727 }
2728 }
2729
2730 if (journal_inum && journal_dev) {
Mingming Cao617ba132006-10-11 01:20:53 -07002731 printk(KERN_ERR "EXT4-fs: filesystem has both journal "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002732 "and inode journals!\n");
2733 return -EINVAL;
2734 }
2735
2736 if (journal_inum) {
Mingming Cao617ba132006-10-11 01:20:53 -07002737 if (!(journal = ext4_get_journal(sb, journal_inum)))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002738 return -EINVAL;
2739 } else {
Mingming Cao617ba132006-10-11 01:20:53 -07002740 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002741 return -EINVAL;
2742 }
2743
Theodore Ts'o4776004f2008-09-08 23:00:52 -04002744 if (journal->j_flags & JBD2_BARRIER)
2745 printk(KERN_INFO "EXT4-fs: barriers enabled\n");
2746 else
2747 printk(KERN_INFO "EXT4-fs: barriers disabled\n");
2748
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002749 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
Mingming Caodab291a2006-10-11 01:21:01 -07002750 err = jbd2_journal_update_format(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002751 if (err) {
Mingming Cao617ba132006-10-11 01:20:53 -07002752 printk(KERN_ERR "EXT4-fs: error updating journal.\n");
Mingming Caodab291a2006-10-11 01:21:01 -07002753 jbd2_journal_destroy(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002754 return err;
2755 }
2756 }
2757
Mingming Cao617ba132006-10-11 01:20:53 -07002758 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
Mingming Caodab291a2006-10-11 01:21:01 -07002759 err = jbd2_journal_wipe(journal, !really_read_only);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002760 if (!err)
Mingming Caodab291a2006-10-11 01:21:01 -07002761 err = jbd2_journal_load(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002762
2763 if (err) {
Mingming Cao617ba132006-10-11 01:20:53 -07002764 printk(KERN_ERR "EXT4-fs: error loading journal.\n");
Mingming Caodab291a2006-10-11 01:21:01 -07002765 jbd2_journal_destroy(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002766 return err;
2767 }
2768
Mingming Cao617ba132006-10-11 01:20:53 -07002769 EXT4_SB(sb)->s_journal = journal;
2770 ext4_clear_journal_err(sb, es);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002771
2772 if (journal_devnum &&
2773 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2774 es->s_journal_dev = cpu_to_le32(journal_devnum);
2775 sb->s_dirt = 1;
2776
2777 /* Make sure we flush the recovery flag to disk. */
Mingming Cao617ba132006-10-11 01:20:53 -07002778 ext4_commit_super(sb, es, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002779 }
2780
2781 return 0;
2782}
2783
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002784static int ext4_create_journal(struct super_block *sb,
2785 struct ext4_super_block *es,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002786 unsigned int journal_inum)
2787{
2788 journal_t *journal;
Borislav Petkov6c675bd2007-07-15 23:41:45 -07002789 int err;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002790
2791 if (sb->s_flags & MS_RDONLY) {
Mingming Cao617ba132006-10-11 01:20:53 -07002792 printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002793 "create journal.\n");
2794 return -EROFS;
2795 }
2796
Borislav Petkov6c675bd2007-07-15 23:41:45 -07002797 journal = ext4_get_journal(sb, journal_inum);
2798 if (!journal)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002799 return -EINVAL;
2800
Mingming Cao617ba132006-10-11 01:20:53 -07002801 printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002802 journal_inum);
2803
Borislav Petkov6c675bd2007-07-15 23:41:45 -07002804 err = jbd2_journal_create(journal);
2805 if (err) {
Mingming Cao617ba132006-10-11 01:20:53 -07002806 printk(KERN_ERR "EXT4-fs: error creating journal.\n");
Mingming Caodab291a2006-10-11 01:21:01 -07002807 jbd2_journal_destroy(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002808 return -EIO;
2809 }
2810
Mingming Cao617ba132006-10-11 01:20:53 -07002811 EXT4_SB(sb)->s_journal = journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002812
Mingming Cao617ba132006-10-11 01:20:53 -07002813 ext4_update_dynamic_rev(sb);
2814 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2815 EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002816
2817 es->s_journal_inum = cpu_to_le32(journal_inum);
2818 sb->s_dirt = 1;
2819
2820 /* Make sure we flush the recovery flag to disk. */
Mingming Cao617ba132006-10-11 01:20:53 -07002821 ext4_commit_super(sb, es, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002822
2823 return 0;
2824}
2825
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002826static void ext4_commit_super(struct super_block *sb,
2827 struct ext4_super_block *es, int sync)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002828{
Mingming Cao617ba132006-10-11 01:20:53 -07002829 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002830
2831 if (!sbh)
2832 return;
Theodore Ts'o914258b2008-10-06 21:35:40 -04002833 if (buffer_write_io_error(sbh)) {
2834 /*
2835 * Oh, dear. A previous attempt to write the
2836 * superblock failed. This could happen because the
2837 * USB device was yanked out. Or it could happen to
2838 * be a transient write error and maybe the block will
2839 * be remapped. Nothing we can do but to retry the
2840 * write and hope for the best.
2841 */
2842 printk(KERN_ERR "ext4: previous I/O error to "
2843 "superblock detected for %s.\n", sb->s_id);
2844 clear_buffer_write_io_error(sbh);
2845 set_buffer_uptodate(sbh);
2846 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002847 es->s_wtime = cpu_to_le32(get_seconds());
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002848 ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb));
Mingming Cao617ba132006-10-11 01:20:53 -07002849 es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002850 BUFFER_TRACE(sbh, "marking dirty");
2851 mark_buffer_dirty(sbh);
Theodore Ts'o914258b2008-10-06 21:35:40 -04002852 if (sync) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002853 sync_dirty_buffer(sbh);
Theodore Ts'o914258b2008-10-06 21:35:40 -04002854 if (buffer_write_io_error(sbh)) {
2855 printk(KERN_ERR "ext4: I/O error while writing "
2856 "superblock for %s.\n", sb->s_id);
2857 clear_buffer_write_io_error(sbh);
2858 set_buffer_uptodate(sbh);
2859 }
2860 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002861}
2862
2863
2864/*
2865 * Have we just finished recovery? If so, and if we are mounting (or
2866 * remounting) the filesystem readonly, then we will end up with a
2867 * consistent fs on disk. Record that fact.
2868 */
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002869static void ext4_mark_recovery_complete(struct super_block *sb,
2870 struct ext4_super_block *es)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002871{
Mingming Cao617ba132006-10-11 01:20:53 -07002872 journal_t *journal = EXT4_SB(sb)->s_journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002873
Mingming Caodab291a2006-10-11 01:21:01 -07002874 jbd2_journal_lock_updates(journal);
Hidehiro Kawai7ffe1ea2008-10-10 20:29:21 -04002875 if (jbd2_journal_flush(journal) < 0)
2876 goto out;
2877
Jan Kara32c37732007-07-15 23:41:09 -07002878 lock_super(sb);
Mingming Cao617ba132006-10-11 01:20:53 -07002879 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002880 sb->s_flags & MS_RDONLY) {
Mingming Cao617ba132006-10-11 01:20:53 -07002881 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002882 sb->s_dirt = 0;
Mingming Cao617ba132006-10-11 01:20:53 -07002883 ext4_commit_super(sb, es, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002884 }
Jan Kara32c37732007-07-15 23:41:09 -07002885 unlock_super(sb);
Hidehiro Kawai7ffe1ea2008-10-10 20:29:21 -04002886
2887out:
Mingming Caodab291a2006-10-11 01:21:01 -07002888 jbd2_journal_unlock_updates(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002889}
2890
2891/*
2892 * If we are mounting (or read-write remounting) a filesystem whose journal
2893 * has recorded an error from a previous lifetime, move that error to the
2894 * main filesystem now.
2895 */
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002896static void ext4_clear_journal_err(struct super_block *sb,
2897 struct ext4_super_block *es)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002898{
2899 journal_t *journal;
2900 int j_errno;
2901 const char *errstr;
2902
Mingming Cao617ba132006-10-11 01:20:53 -07002903 journal = EXT4_SB(sb)->s_journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002904
2905 /*
2906 * Now check for any error status which may have been recorded in the
Mingming Cao617ba132006-10-11 01:20:53 -07002907 * journal by a prior ext4_error() or ext4_abort()
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002908 */
2909
Mingming Caodab291a2006-10-11 01:21:01 -07002910 j_errno = jbd2_journal_errno(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002911 if (j_errno) {
2912 char nbuf[16];
2913
Mingming Cao617ba132006-10-11 01:20:53 -07002914 errstr = ext4_decode_error(sb, j_errno, nbuf);
Harvey Harrison46e665e2008-04-17 10:38:59 -04002915 ext4_warning(sb, __func__, "Filesystem error recorded "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002916 "from previous mount: %s", errstr);
Harvey Harrison46e665e2008-04-17 10:38:59 -04002917 ext4_warning(sb, __func__, "Marking fs in need of "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002918 "filesystem check.");
2919
Mingming Cao617ba132006-10-11 01:20:53 -07002920 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2921 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002922 ext4_commit_super(sb, es, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002923
Mingming Caodab291a2006-10-11 01:21:01 -07002924 jbd2_journal_clear_err(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002925 }
2926}
2927
2928/*
2929 * Force the running and committing transactions to commit,
2930 * and wait on the commit.
2931 */
Mingming Cao617ba132006-10-11 01:20:53 -07002932int ext4_force_commit(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002933{
2934 journal_t *journal;
2935 int ret;
2936
2937 if (sb->s_flags & MS_RDONLY)
2938 return 0;
2939
Mingming Cao617ba132006-10-11 01:20:53 -07002940 journal = EXT4_SB(sb)->s_journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002941 sb->s_dirt = 0;
Mingming Cao617ba132006-10-11 01:20:53 -07002942 ret = ext4_journal_force_commit(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002943 return ret;
2944}
2945
2946/*
Mingming Cao617ba132006-10-11 01:20:53 -07002947 * Ext4 always journals updates to the superblock itself, so we don't
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002948 * have to propagate any other updates to the superblock on disk at this
2949 * point. Just start an async writeback to get the buffers on their way
2950 * to the disk.
2951 *
2952 * This implicitly triggers the writebehind on sync().
2953 */
2954
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002955static void ext4_write_super(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002956{
2957 if (mutex_trylock(&sb->s_lock) != 0)
2958 BUG();
2959 sb->s_dirt = 0;
2960}
2961
Mingming Cao617ba132006-10-11 01:20:53 -07002962static int ext4_sync_fs(struct super_block *sb, int wait)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002963{
2964 tid_t target;
2965
Theodore Ts'oede86cc2008-10-05 20:50:06 -04002966 trace_mark(ext4_sync_fs, "dev %s wait %d", sb->s_id, wait);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002967 sb->s_dirt = 0;
Mingming Caodab291a2006-10-11 01:21:01 -07002968 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002969 if (wait)
Mingming Caodab291a2006-10-11 01:21:01 -07002970 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002971 }
2972 return 0;
2973}
2974
2975/*
2976 * LVM calls this function before a (read-only) snapshot is created. This
2977 * gives us a chance to flush the journal completely and mark the fs clean.
2978 */
Mingming Cao617ba132006-10-11 01:20:53 -07002979static void ext4_write_super_lockfs(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002980{
2981 sb->s_dirt = 0;
2982
2983 if (!(sb->s_flags & MS_RDONLY)) {
Mingming Cao617ba132006-10-11 01:20:53 -07002984 journal_t *journal = EXT4_SB(sb)->s_journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002985
2986 /* Now we set up the journal barrier. */
Mingming Caodab291a2006-10-11 01:21:01 -07002987 jbd2_journal_lock_updates(journal);
Hidehiro Kawai7ffe1ea2008-10-10 20:29:21 -04002988
2989 /*
2990 * We don't want to clear needs_recovery flag when we failed
2991 * to flush the journal.
2992 */
2993 if (jbd2_journal_flush(journal) < 0)
2994 return;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002995
2996 /* Journal blocked and flushed, clear needs_recovery flag. */
Mingming Cao617ba132006-10-11 01:20:53 -07002997 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2998 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002999 }
3000}
3001
3002/*
3003 * Called by LVM after the snapshot is done. We need to reset the RECOVER
3004 * flag here, even though the filesystem is not technically dirty yet.
3005 */
Mingming Cao617ba132006-10-11 01:20:53 -07003006static void ext4_unlockfs(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003007{
3008 if (!(sb->s_flags & MS_RDONLY)) {
3009 lock_super(sb);
3010 /* Reser the needs_recovery flag before the fs is unlocked. */
Mingming Cao617ba132006-10-11 01:20:53 -07003011 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3012 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003013 unlock_super(sb);
Mingming Caodab291a2006-10-11 01:21:01 -07003014 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003015 }
3016}
3017
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04003018static int ext4_remount(struct super_block *sb, int *flags, char *data)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003019{
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04003020 struct ext4_super_block *es;
Mingming Cao617ba132006-10-11 01:20:53 -07003021 struct ext4_sb_info *sbi = EXT4_SB(sb);
3022 ext4_fsblk_t n_blocks_count = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003023 unsigned long old_sb_flags;
Mingming Cao617ba132006-10-11 01:20:53 -07003024 struct ext4_mount_options old_opts;
Theodore Ts'o8a266462008-07-26 14:34:21 -04003025 ext4_group_t g;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003026 int err;
3027#ifdef CONFIG_QUOTA
3028 int i;
3029#endif
3030
3031 /* Store the original options */
3032 old_sb_flags = sb->s_flags;
3033 old_opts.s_mount_opt = sbi->s_mount_opt;
3034 old_opts.s_resuid = sbi->s_resuid;
3035 old_opts.s_resgid = sbi->s_resgid;
3036 old_opts.s_commit_interval = sbi->s_commit_interval;
3037#ifdef CONFIG_QUOTA
3038 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
3039 for (i = 0; i < MAXQUOTAS; i++)
3040 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
3041#endif
3042
3043 /*
3044 * Allow the "check" option to be passed as a remount option.
3045 */
3046 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
3047 err = -EINVAL;
3048 goto restore_opts;
3049 }
3050
Mingming Cao617ba132006-10-11 01:20:53 -07003051 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT)
Harvey Harrison46e665e2008-04-17 10:38:59 -04003052 ext4_abort(sb, __func__, "Abort forced by user");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003053
3054 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
Mingming Cao617ba132006-10-11 01:20:53 -07003055 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003056
3057 es = sbi->s_es;
3058
Mingming Cao617ba132006-10-11 01:20:53 -07003059 ext4_init_journal_params(sb, sbi->s_journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003060
3061 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07003062 n_blocks_count > ext4_blocks_count(es)) {
Mingming Cao617ba132006-10-11 01:20:53 -07003063 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003064 err = -EROFS;
3065 goto restore_opts;
3066 }
3067
3068 if (*flags & MS_RDONLY) {
3069 /*
3070 * First of all, the unconditional stuff we have to do
3071 * to disable replay of the journal when we next remount
3072 */
3073 sb->s_flags |= MS_RDONLY;
3074
3075 /*
3076 * OK, test if we are remounting a valid rw partition
3077 * readonly, and if so set the rdonly flag and then
3078 * mark the partition as valid again.
3079 */
Mingming Cao617ba132006-10-11 01:20:53 -07003080 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
3081 (sbi->s_mount_state & EXT4_VALID_FS))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003082 es->s_state = cpu_to_le16(sbi->s_mount_state);
3083
Jan Kara32c37732007-07-15 23:41:09 -07003084 /*
3085 * We have to unlock super so that we can wait for
3086 * transactions.
3087 */
3088 unlock_super(sb);
Mingming Cao617ba132006-10-11 01:20:53 -07003089 ext4_mark_recovery_complete(sb, es);
Jan Kara32c37732007-07-15 23:41:09 -07003090 lock_super(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003091 } else {
3092 __le32 ret;
Mingming Cao617ba132006-10-11 01:20:53 -07003093 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3094 ~EXT4_FEATURE_RO_COMPAT_SUPP))) {
3095 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003096 "remount RDWR because of unsupported "
3097 "optional features (%x).\n",
3098 sb->s_id, le32_to_cpu(ret));
3099 err = -EROFS;
3100 goto restore_opts;
3101 }
Eric Sandeenead65962007-02-10 01:46:08 -08003102
3103 /*
Theodore Ts'o8a266462008-07-26 14:34:21 -04003104 * Make sure the group descriptor checksums
3105 * are sane. If they aren't, refuse to
3106 * remount r/w.
3107 */
3108 for (g = 0; g < sbi->s_groups_count; g++) {
3109 struct ext4_group_desc *gdp =
3110 ext4_get_group_desc(sb, g, NULL);
3111
3112 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
3113 printk(KERN_ERR
3114 "EXT4-fs: ext4_remount: "
3115 "Checksum for group %lu failed (%u!=%u)\n",
3116 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
3117 le16_to_cpu(gdp->bg_checksum));
3118 err = -EINVAL;
3119 goto restore_opts;
3120 }
3121 }
3122
3123 /*
Eric Sandeenead65962007-02-10 01:46:08 -08003124 * If we have an unprocessed orphan list hanging
3125 * around from a previously readonly bdev mount,
3126 * require a full umount/remount for now.
3127 */
3128 if (es->s_last_orphan) {
3129 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
3130 "remount RDWR because of unprocessed "
3131 "orphan inode list. Please "
3132 "umount/remount instead.\n",
3133 sb->s_id);
3134 err = -EINVAL;
3135 goto restore_opts;
3136 }
3137
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003138 /*
3139 * Mounting a RDONLY partition read-write, so reread
3140 * and store the current valid flag. (It may have
3141 * been changed by e2fsck since we originally mounted
3142 * the partition.)
3143 */
Mingming Cao617ba132006-10-11 01:20:53 -07003144 ext4_clear_journal_err(sb, es);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003145 sbi->s_mount_state = le16_to_cpu(es->s_state);
Mingming Cao617ba132006-10-11 01:20:53 -07003146 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003147 goto restore_opts;
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04003148 if (!ext4_setup_super(sb, es, 0))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003149 sb->s_flags &= ~MS_RDONLY;
3150 }
3151 }
3152#ifdef CONFIG_QUOTA
3153 /* Release old quota file names */
3154 for (i = 0; i < MAXQUOTAS; i++)
3155 if (old_opts.s_qf_names[i] &&
3156 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3157 kfree(old_opts.s_qf_names[i]);
3158#endif
3159 return 0;
3160restore_opts:
3161 sb->s_flags = old_sb_flags;
3162 sbi->s_mount_opt = old_opts.s_mount_opt;
3163 sbi->s_resuid = old_opts.s_resuid;
3164 sbi->s_resgid = old_opts.s_resgid;
3165 sbi->s_commit_interval = old_opts.s_commit_interval;
3166#ifdef CONFIG_QUOTA
3167 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
3168 for (i = 0; i < MAXQUOTAS; i++) {
3169 if (sbi->s_qf_names[i] &&
3170 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3171 kfree(sbi->s_qf_names[i]);
3172 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
3173 }
3174#endif
3175 return err;
3176}
3177
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04003178static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003179{
3180 struct super_block *sb = dentry->d_sb;
Mingming Cao617ba132006-10-11 01:20:53 -07003181 struct ext4_sb_info *sbi = EXT4_SB(sb);
3182 struct ext4_super_block *es = sbi->s_es;
Pekka Enberg960cc392006-12-06 20:35:29 -08003183 u64 fsid;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003184
Badari Pulavarty5e700302007-07-15 23:42:00 -07003185 if (test_opt(sb, MINIX_DF)) {
3186 sbi->s_overhead_last = 0;
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -04003187 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
Avantika Mathurfd2d4292008-01-28 23:58:27 -05003188 ext4_group_t ngroups = sbi->s_groups_count, i;
Badari Pulavarty5e700302007-07-15 23:42:00 -07003189 ext4_fsblk_t overhead = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003190 smp_rmb();
3191
3192 /*
Badari Pulavarty5e700302007-07-15 23:42:00 -07003193 * Compute the overhead (FS structures). This is constant
3194 * for a given filesystem unless the number of block groups
3195 * changes so we cache the previous value until it does.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003196 */
3197
3198 /*
3199 * All of the blocks before first_data_block are
3200 * overhead
3201 */
3202 overhead = le32_to_cpu(es->s_first_data_block);
3203
3204 /*
3205 * Add the overhead attributed to the superblock and
3206 * block group descriptors. If the sparse superblocks
3207 * feature is turned on, then not all groups have this.
3208 */
3209 for (i = 0; i < ngroups; i++) {
Mingming Cao617ba132006-10-11 01:20:53 -07003210 overhead += ext4_bg_has_super(sb, i) +
3211 ext4_bg_num_gdb(sb, i);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003212 cond_resched();
3213 }
3214
3215 /*
3216 * Every block group has an inode bitmap, a block
3217 * bitmap, and an inode table.
3218 */
Badari Pulavarty5e700302007-07-15 23:42:00 -07003219 overhead += ngroups * (2 + sbi->s_itb_per_group);
3220 sbi->s_overhead_last = overhead;
3221 smp_wmb();
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -04003222 sbi->s_blocks_last = ext4_blocks_count(es);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003223 }
3224
Mingming Cao617ba132006-10-11 01:20:53 -07003225 buf->f_type = EXT4_SUPER_MAGIC;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003226 buf->f_bsize = sb->s_blocksize;
Badari Pulavarty5e700302007-07-15 23:42:00 -07003227 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
Aneesh Kumar K.V6bc6e632008-10-10 09:39:00 -04003228 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) -
3229 percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter);
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04003230 ext4_free_blocks_count_set(es, buf->f_bfree);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07003231 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
3232 if (buf->f_bfree < ext4_r_blocks_count(es))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003233 buf->f_bavail = 0;
3234 buf->f_files = le32_to_cpu(es->s_inodes_count);
Peter Zijlstra52d9f3b2007-10-16 23:25:44 -07003235 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
Badari Pulavarty5e700302007-07-15 23:42:00 -07003236 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
Mingming Cao617ba132006-10-11 01:20:53 -07003237 buf->f_namelen = EXT4_NAME_LEN;
Pekka Enberg960cc392006-12-06 20:35:29 -08003238 fsid = le64_to_cpup((void *)es->s_uuid) ^
3239 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
3240 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
3241 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003242 return 0;
3243}
3244
3245/* Helper function for writing quotas on sync - we need to start transaction before quota file
3246 * is locked for write. Otherwise the are possible deadlocks:
3247 * Process 1 Process 2
Mingming Cao617ba132006-10-11 01:20:53 -07003248 * ext4_create() quota_sync()
Mingming Caodab291a2006-10-11 01:21:01 -07003249 * jbd2_journal_start() write_dquot()
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003250 * DQUOT_INIT() down(dqio_mutex)
Mingming Caodab291a2006-10-11 01:21:01 -07003251 * down(dqio_mutex) jbd2_journal_start()
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003252 *
3253 */
3254
3255#ifdef CONFIG_QUOTA
3256
3257static inline struct inode *dquot_to_inode(struct dquot *dquot)
3258{
3259 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
3260}
3261
Mingming Cao617ba132006-10-11 01:20:53 -07003262static int ext4_dquot_initialize(struct inode *inode, int type)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003263{
3264 handle_t *handle;
3265 int ret, err;
3266
3267 /* We may create quota structure so we need to reserve enough blocks */
Mingming Cao617ba132006-10-11 01:20:53 -07003268 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003269 if (IS_ERR(handle))
3270 return PTR_ERR(handle);
3271 ret = dquot_initialize(inode, type);
Mingming Cao617ba132006-10-11 01:20:53 -07003272 err = ext4_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003273 if (!ret)
3274 ret = err;
3275 return ret;
3276}
3277
Mingming Cao617ba132006-10-11 01:20:53 -07003278static int ext4_dquot_drop(struct inode *inode)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003279{
3280 handle_t *handle;
3281 int ret, err;
3282
3283 /* We may delete quota structure so we need to reserve enough blocks */
Mingming Cao617ba132006-10-11 01:20:53 -07003284 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb));
Jan Kara2887df12008-04-29 22:02:07 -04003285 if (IS_ERR(handle)) {
3286 /*
3287 * We call dquot_drop() anyway to at least release references
3288 * to quota structures so that umount does not hang.
3289 */
3290 dquot_drop(inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003291 return PTR_ERR(handle);
Jan Kara2887df12008-04-29 22:02:07 -04003292 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003293 ret = dquot_drop(inode);
Mingming Cao617ba132006-10-11 01:20:53 -07003294 err = ext4_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003295 if (!ret)
3296 ret = err;
3297 return ret;
3298}
3299
Mingming Cao617ba132006-10-11 01:20:53 -07003300static int ext4_write_dquot(struct dquot *dquot)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003301{
3302 int ret, err;
3303 handle_t *handle;
3304 struct inode *inode;
3305
3306 inode = dquot_to_inode(dquot);
Mingming Cao617ba132006-10-11 01:20:53 -07003307 handle = ext4_journal_start(inode,
3308 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003309 if (IS_ERR(handle))
3310 return PTR_ERR(handle);
3311 ret = dquot_commit(dquot);
Mingming Cao617ba132006-10-11 01:20:53 -07003312 err = ext4_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003313 if (!ret)
3314 ret = err;
3315 return ret;
3316}
3317
Mingming Cao617ba132006-10-11 01:20:53 -07003318static int ext4_acquire_dquot(struct dquot *dquot)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003319{
3320 int ret, err;
3321 handle_t *handle;
3322
Mingming Cao617ba132006-10-11 01:20:53 -07003323 handle = ext4_journal_start(dquot_to_inode(dquot),
3324 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003325 if (IS_ERR(handle))
3326 return PTR_ERR(handle);
3327 ret = dquot_acquire(dquot);
Mingming Cao617ba132006-10-11 01:20:53 -07003328 err = ext4_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003329 if (!ret)
3330 ret = err;
3331 return ret;
3332}
3333
Mingming Cao617ba132006-10-11 01:20:53 -07003334static int ext4_release_dquot(struct dquot *dquot)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003335{
3336 int ret, err;
3337 handle_t *handle;
3338
Mingming Cao617ba132006-10-11 01:20:53 -07003339 handle = ext4_journal_start(dquot_to_inode(dquot),
3340 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
Jan Kara9c3013e2007-09-11 15:23:29 -07003341 if (IS_ERR(handle)) {
3342 /* Release dquot anyway to avoid endless cycle in dqput() */
3343 dquot_release(dquot);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003344 return PTR_ERR(handle);
Jan Kara9c3013e2007-09-11 15:23:29 -07003345 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003346 ret = dquot_release(dquot);
Mingming Cao617ba132006-10-11 01:20:53 -07003347 err = ext4_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003348 if (!ret)
3349 ret = err;
3350 return ret;
3351}
3352
Mingming Cao617ba132006-10-11 01:20:53 -07003353static int ext4_mark_dquot_dirty(struct dquot *dquot)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003354{
Jan Kara2c8be6b2008-05-13 21:27:55 -04003355 /* Are we journaling quotas? */
Mingming Cao617ba132006-10-11 01:20:53 -07003356 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
3357 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003358 dquot_mark_dquot_dirty(dquot);
Mingming Cao617ba132006-10-11 01:20:53 -07003359 return ext4_write_dquot(dquot);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003360 } else {
3361 return dquot_mark_dquot_dirty(dquot);
3362 }
3363}
3364
Mingming Cao617ba132006-10-11 01:20:53 -07003365static int ext4_write_info(struct super_block *sb, int type)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003366{
3367 int ret, err;
3368 handle_t *handle;
3369
3370 /* Data block + inode block */
Mingming Cao617ba132006-10-11 01:20:53 -07003371 handle = ext4_journal_start(sb->s_root->d_inode, 2);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003372 if (IS_ERR(handle))
3373 return PTR_ERR(handle);
3374 ret = dquot_commit_info(sb, type);
Mingming Cao617ba132006-10-11 01:20:53 -07003375 err = ext4_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003376 if (!ret)
3377 ret = err;
3378 return ret;
3379}
3380
3381/*
3382 * Turn on quotas during mount time - we need to find
3383 * the quota file and such...
3384 */
Mingming Cao617ba132006-10-11 01:20:53 -07003385static int ext4_quota_on_mount(struct super_block *sb, int type)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003386{
Mingming Cao617ba132006-10-11 01:20:53 -07003387 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
3388 EXT4_SB(sb)->s_jquota_fmt, type);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003389}
3390
3391/*
3392 * Standard function to be called on quota_on
3393 */
Mingming Cao617ba132006-10-11 01:20:53 -07003394static int ext4_quota_on(struct super_block *sb, int type, int format_id,
Jan Kara6f28e082008-04-28 02:14:34 -07003395 char *path, int remount)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003396{
3397 int err;
3398 struct nameidata nd;
3399
3400 if (!test_opt(sb, QUOTA))
3401 return -EINVAL;
Jan Kara06235432008-05-13 19:11:51 -04003402 /* When remounting, no checks are needed and in fact, path is NULL */
3403 if (remount)
Jan Kara6f28e082008-04-28 02:14:34 -07003404 return vfs_quota_on(sb, type, format_id, path, remount);
Jan Kara06235432008-05-13 19:11:51 -04003405
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003406 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
3407 if (err)
3408 return err;
Jan Kara06235432008-05-13 19:11:51 -04003409
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003410 /* Quotafile not on the same filesystem? */
Jan Blunck4ac91372008-02-14 19:34:32 -08003411 if (nd.path.mnt->mnt_sb != sb) {
Jan Blunck1d957f92008-02-14 19:34:35 -08003412 path_put(&nd.path);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003413 return -EXDEV;
3414 }
Jan Kara06235432008-05-13 19:11:51 -04003415 /* Journaling quota? */
3416 if (EXT4_SB(sb)->s_qf_names[type]) {
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04003417 /* Quotafile not in fs root? */
Jan Kara06235432008-05-13 19:11:51 -04003418 if (nd.path.dentry->d_parent->d_inode != sb->s_root->d_inode)
3419 printk(KERN_WARNING
3420 "EXT4-fs: Quota file not on filesystem root. "
3421 "Journaled quota will not work.\n");
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04003422 }
Jan Kara06235432008-05-13 19:11:51 -04003423
3424 /*
3425 * When we journal data on quota file, we have to flush journal to see
3426 * all updates to the file when we bypass pagecache...
3427 */
3428 if (ext4_should_journal_data(nd.path.dentry->d_inode)) {
3429 /*
3430 * We don't need to lock updates but journal_flush() could
3431 * otherwise be livelocked...
3432 */
3433 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
Hidehiro Kawai7ffe1ea2008-10-10 20:29:21 -04003434 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
Jan Kara06235432008-05-13 19:11:51 -04003435 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
Hidehiro Kawai7ffe1ea2008-10-10 20:29:21 -04003436 if (err) {
3437 path_put(&nd.path);
3438 return err;
3439 }
Jan Kara06235432008-05-13 19:11:51 -04003440 }
3441
Al Viro77e69da2008-08-01 04:29:18 -04003442 err = vfs_quota_on_path(sb, type, format_id, &nd.path);
Jan Blunck1d957f92008-02-14 19:34:35 -08003443 path_put(&nd.path);
Al Viro77e69da2008-08-01 04:29:18 -04003444 return err;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003445}
3446
3447/* Read data from quotafile - avoid pagecache and such because we cannot afford
3448 * acquiring the locks... As quota files are never truncated and quota code
3449 * itself serializes the operations (and noone else should touch the files)
3450 * we don't have to be afraid of races */
Mingming Cao617ba132006-10-11 01:20:53 -07003451static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003452 size_t len, loff_t off)
3453{
3454 struct inode *inode = sb_dqopt(sb)->files[type];
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05003455 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003456 int err = 0;
3457 int offset = off & (sb->s_blocksize - 1);
3458 int tocopy;
3459 size_t toread;
3460 struct buffer_head *bh;
3461 loff_t i_size = i_size_read(inode);
3462
3463 if (off > i_size)
3464 return 0;
3465 if (off+len > i_size)
3466 len = i_size-off;
3467 toread = len;
3468 while (toread > 0) {
3469 tocopy = sb->s_blocksize - offset < toread ?
3470 sb->s_blocksize - offset : toread;
Mingming Cao617ba132006-10-11 01:20:53 -07003471 bh = ext4_bread(NULL, inode, blk, 0, &err);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003472 if (err)
3473 return err;
3474 if (!bh) /* A hole? */
3475 memset(data, 0, tocopy);
3476 else
3477 memcpy(data, bh->b_data+offset, tocopy);
3478 brelse(bh);
3479 offset = 0;
3480 toread -= tocopy;
3481 data += tocopy;
3482 blk++;
3483 }
3484 return len;
3485}
3486
3487/* Write to quotafile (we know the transaction is already started and has
3488 * enough credits) */
Mingming Cao617ba132006-10-11 01:20:53 -07003489static ssize_t ext4_quota_write(struct super_block *sb, int type,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003490 const char *data, size_t len, loff_t off)
3491{
3492 struct inode *inode = sb_dqopt(sb)->files[type];
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05003493 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003494 int err = 0;
3495 int offset = off & (sb->s_blocksize - 1);
3496 int tocopy;
Mingming Cao617ba132006-10-11 01:20:53 -07003497 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003498 size_t towrite = len;
3499 struct buffer_head *bh;
3500 handle_t *handle = journal_current_handle();
3501
Jan Kara9c3013e2007-09-11 15:23:29 -07003502 if (!handle) {
Theodore Ts'oe5f8eab82008-09-08 22:25:04 -04003503 printk(KERN_WARNING "EXT4-fs: Quota write (off=%llu, len=%llu)"
Jan Kara9c3013e2007-09-11 15:23:29 -07003504 " cancelled because transaction is not started.\n",
3505 (unsigned long long)off, (unsigned long long)len);
3506 return -EIO;
3507 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003508 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
3509 while (towrite > 0) {
3510 tocopy = sb->s_blocksize - offset < towrite ?
3511 sb->s_blocksize - offset : towrite;
Mingming Cao617ba132006-10-11 01:20:53 -07003512 bh = ext4_bread(handle, inode, blk, 1, &err);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003513 if (!bh)
3514 goto out;
3515 if (journal_quota) {
Mingming Cao617ba132006-10-11 01:20:53 -07003516 err = ext4_journal_get_write_access(handle, bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003517 if (err) {
3518 brelse(bh);
3519 goto out;
3520 }
3521 }
3522 lock_buffer(bh);
3523 memcpy(bh->b_data+offset, data, tocopy);
3524 flush_dcache_page(bh->b_page);
3525 unlock_buffer(bh);
3526 if (journal_quota)
Mingming Cao617ba132006-10-11 01:20:53 -07003527 err = ext4_journal_dirty_metadata(handle, bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003528 else {
3529 /* Always do at least ordered writes for quotas */
Jan Kara678aaf42008-07-11 19:27:31 -04003530 err = ext4_jbd2_file_inode(handle, inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003531 mark_buffer_dirty(bh);
3532 }
3533 brelse(bh);
3534 if (err)
3535 goto out;
3536 offset = 0;
3537 towrite -= tocopy;
3538 data += tocopy;
3539 blk++;
3540 }
3541out:
Jan Kara4d04e4f2008-07-04 09:59:34 -07003542 if (len == towrite) {
3543 mutex_unlock(&inode->i_mutex);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003544 return err;
Jan Kara4d04e4f2008-07-04 09:59:34 -07003545 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003546 if (inode->i_size < off+len-towrite) {
3547 i_size_write(inode, off+len-towrite);
Mingming Cao617ba132006-10-11 01:20:53 -07003548 EXT4_I(inode)->i_disksize = inode->i_size;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003549 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003550 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
Mingming Cao617ba132006-10-11 01:20:53 -07003551 ext4_mark_inode_dirty(handle, inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003552 mutex_unlock(&inode->i_mutex);
3553 return len - towrite;
3554}
3555
3556#endif
3557
Mingming Cao617ba132006-10-11 01:20:53 -07003558static int ext4_get_sb(struct file_system_type *fs_type,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003559 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3560{
Mingming Cao617ba132006-10-11 01:20:53 -07003561 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003562}
3563
Theodore Ts'o5e8814f2008-09-23 18:07:35 -04003564#ifdef CONFIG_PROC_FS
3565static int ext4_ui_proc_show(struct seq_file *m, void *v)
3566{
3567 unsigned int *p = m->private;
3568
3569 seq_printf(m, "%u\n", *p);
3570 return 0;
3571}
3572
3573static int ext4_ui_proc_open(struct inode *inode, struct file *file)
3574{
3575 return single_open(file, ext4_ui_proc_show, PDE(inode)->data);
3576}
3577
3578static ssize_t ext4_ui_proc_write(struct file *file, const char __user *buf,
3579 size_t cnt, loff_t *ppos)
3580{
3581 unsigned int *p = PDE(file->f_path.dentry->d_inode)->data;
3582 char str[32];
3583 unsigned long value;
3584
3585 if (cnt >= sizeof(str))
3586 return -EINVAL;
3587 if (copy_from_user(str, buf, cnt))
3588 return -EFAULT;
3589 value = simple_strtol(str, NULL, 0);
3590 if (value < 0)
3591 return -ERANGE;
3592 *p = value;
3593 return cnt;
3594}
3595
3596const struct file_operations ext4_ui_proc_fops = {
3597 .owner = THIS_MODULE,
3598 .open = ext4_ui_proc_open,
3599 .read = seq_read,
3600 .llseek = seq_lseek,
3601 .release = single_release,
3602 .write = ext4_ui_proc_write,
3603};
3604#endif
3605
Theodore Ts'o03010a32008-10-10 20:02:48 -04003606static struct file_system_type ext4_fs_type = {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003607 .owner = THIS_MODULE,
Theodore Ts'o03010a32008-10-10 20:02:48 -04003608 .name = "ext4",
Mingming Cao617ba132006-10-11 01:20:53 -07003609 .get_sb = ext4_get_sb,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003610 .kill_sb = kill_block_super,
3611 .fs_flags = FS_REQUIRES_DEV,
3612};
3613
Theodore Ts'o03010a32008-10-10 20:02:48 -04003614#ifdef CONFIG_EXT4DEV_COMPAT
3615static int ext4dev_get_sb(struct file_system_type *fs_type,
3616 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3617{
3618 printk(KERN_WARNING "EXT4-fs: Update your userspace programs "
3619 "to mount using ext4\n");
3620 printk(KERN_WARNING "EXT4-fs: ext4dev backwards compatibility "
3621 "will go away by 2.6.31\n");
3622 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
3623}
3624
3625static struct file_system_type ext4dev_fs_type = {
3626 .owner = THIS_MODULE,
3627 .name = "ext4dev",
3628 .get_sb = ext4dev_get_sb,
3629 .kill_sb = kill_block_super,
3630 .fs_flags = FS_REQUIRES_DEV,
3631};
3632MODULE_ALIAS("ext4dev");
3633#endif
3634
Mingming Cao617ba132006-10-11 01:20:53 -07003635static int __init init_ext4_fs(void)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003636{
Alex Tomasc9de5602008-01-29 00:19:52 -05003637 int err;
3638
Theodore Ts'o9f6200b2008-09-23 09:18:24 -04003639 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
Alex Tomasc9de5602008-01-29 00:19:52 -05003640 err = init_ext4_mballoc();
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003641 if (err)
3642 return err;
Alex Tomasc9de5602008-01-29 00:19:52 -05003643
3644 err = init_ext4_xattr();
3645 if (err)
3646 goto out2;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003647 err = init_inodecache();
3648 if (err)
3649 goto out1;
Theodore Ts'o03010a32008-10-10 20:02:48 -04003650 err = register_filesystem(&ext4_fs_type);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003651 if (err)
3652 goto out;
Theodore Ts'o03010a32008-10-10 20:02:48 -04003653#ifdef CONFIG_EXT4DEV_COMPAT
3654 err = register_filesystem(&ext4dev_fs_type);
3655 if (err) {
3656 unregister_filesystem(&ext4_fs_type);
3657 goto out;
3658 }
3659#endif
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003660 return 0;
3661out:
3662 destroy_inodecache();
3663out1:
Mingming Cao617ba132006-10-11 01:20:53 -07003664 exit_ext4_xattr();
Alex Tomasc9de5602008-01-29 00:19:52 -05003665out2:
3666 exit_ext4_mballoc();
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003667 return err;
3668}
3669
Mingming Cao617ba132006-10-11 01:20:53 -07003670static void __exit exit_ext4_fs(void)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003671{
Theodore Ts'o03010a32008-10-10 20:02:48 -04003672 unregister_filesystem(&ext4_fs_type);
3673#ifdef CONFIG_EXT4DEV_COMPAT
Mingming Cao617ba132006-10-11 01:20:53 -07003674 unregister_filesystem(&ext4dev_fs_type);
Theodore Ts'o03010a32008-10-10 20:02:48 -04003675#endif
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003676 destroy_inodecache();
Mingming Cao617ba132006-10-11 01:20:53 -07003677 exit_ext4_xattr();
Alex Tomasc9de5602008-01-29 00:19:52 -05003678 exit_ext4_mballoc();
Theodore Ts'o9f6200b2008-09-23 09:18:24 -04003679 remove_proc_entry("fs/ext4", NULL);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003680}
3681
3682MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
Mingming Cao617ba132006-10-11 01:20:53 -07003683MODULE_DESCRIPTION("Fourth Extended Filesystem with extents");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003684MODULE_LICENSE("GPL");
Mingming Cao617ba132006-10-11 01:20:53 -07003685module_init(init_ext4_fs)
3686module_exit(exit_ext4_fs)