blob: f7371a6a923d359480108517c1a3358276a42eb7 [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);
Takashi Satoc4be0c12009-01-09 16:40:58 -080054static int ext4_commit_super(struct super_block *sb,
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -040055 struct ext4_super_block *es, int sync);
56static void ext4_mark_recovery_complete(struct super_block *sb,
57 struct ext4_super_block *es);
58static void ext4_clear_journal_err(struct super_block *sb,
59 struct ext4_super_block *es);
Mingming Cao617ba132006-10-11 01:20:53 -070060static int ext4_sync_fs(struct super_block *sb, int wait);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -040061static const char *ext4_decode_error(struct super_block *sb, int errno,
Dave Kleikampac27a0e2006-10-11 01:20:50 -070062 char nbuf[16]);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -040063static int ext4_remount(struct super_block *sb, int *flags, char *data);
64static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
Takashi Satoc4be0c12009-01-09 16:40:58 -080065static int ext4_unfreeze(struct super_block *sb);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -040066static void ext4_write_super(struct super_block *sb);
Takashi Satoc4be0c12009-01-09 16:40:58 -080067static int ext4_freeze(struct super_block *sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -070068
Laurent Vivierbd81d8e2006-10-11 01:21:10 -070069
Alexandre Ratchov8fadc142006-10-11 01:21:15 -070070ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
71 struct ext4_group_desc *bg)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -070072{
Aneesh Kumar K.V3a145892007-10-16 18:38:25 -040073 return le32_to_cpu(bg->bg_block_bitmap_lo) |
Alexandre Ratchov8fadc142006-10-11 01:21:15 -070074 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
Aneesh Kumar K.V3a145892007-10-16 18:38:25 -040075 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -070076}
77
Alexandre Ratchov8fadc142006-10-11 01:21:15 -070078ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
79 struct ext4_group_desc *bg)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -070080{
Aneesh Kumar K.V5272f832007-10-16 18:38:25 -040081 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
Alexandre Ratchov8fadc142006-10-11 01:21:15 -070082 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
Aneesh Kumar K.V5272f832007-10-16 18:38:25 -040083 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -070084}
85
Alexandre Ratchov8fadc142006-10-11 01:21:15 -070086ext4_fsblk_t ext4_inode_table(struct super_block *sb,
87 struct ext4_group_desc *bg)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -070088{
Aneesh Kumar K.V5272f832007-10-16 18:38:25 -040089 return le32_to_cpu(bg->bg_inode_table_lo) |
Alexandre Ratchov8fadc142006-10-11 01:21:15 -070090 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
Aneesh Kumar K.V5272f832007-10-16 18:38:25 -040091 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -070092}
93
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -050094__u32 ext4_free_blks_count(struct super_block *sb,
95 struct ext4_group_desc *bg)
96{
97 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
98 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
99 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
100}
101
102__u32 ext4_free_inodes_count(struct super_block *sb,
103 struct ext4_group_desc *bg)
104{
105 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
106 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
107 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
108}
109
110__u32 ext4_used_dirs_count(struct super_block *sb,
111 struct ext4_group_desc *bg)
112{
113 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
114 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
115 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
116}
117
118__u32 ext4_itable_unused_count(struct super_block *sb,
119 struct ext4_group_desc *bg)
120{
121 return le16_to_cpu(bg->bg_itable_unused_lo) |
122 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
123 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
124}
125
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700126void ext4_block_bitmap_set(struct super_block *sb,
127 struct ext4_group_desc *bg, ext4_fsblk_t blk)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700128{
Aneesh Kumar K.V3a145892007-10-16 18:38:25 -0400129 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700130 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
131 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700132}
133
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700134void ext4_inode_bitmap_set(struct super_block *sb,
135 struct ext4_group_desc *bg, ext4_fsblk_t blk)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700136{
Aneesh Kumar K.V5272f832007-10-16 18:38:25 -0400137 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700138 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
139 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700140}
141
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700142void ext4_inode_table_set(struct super_block *sb,
143 struct ext4_group_desc *bg, ext4_fsblk_t blk)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700144{
Aneesh Kumar K.V5272f832007-10-16 18:38:25 -0400145 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
Alexandre Ratchov8fadc142006-10-11 01:21:15 -0700146 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
147 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -0700148}
149
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -0500150void ext4_free_blks_set(struct super_block *sb,
151 struct ext4_group_desc *bg, __u32 count)
152{
153 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
154 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
155 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
156}
157
158void ext4_free_inodes_set(struct super_block *sb,
159 struct ext4_group_desc *bg, __u32 count)
160{
161 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
162 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
163 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
164}
165
166void ext4_used_dirs_set(struct super_block *sb,
167 struct ext4_group_desc *bg, __u32 count)
168{
169 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
170 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
171 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
172}
173
174void ext4_itable_unused_set(struct super_block *sb,
175 struct ext4_group_desc *bg, __u32 count)
176{
177 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
178 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
179 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
180}
181
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700182/*
Mingming Caodab291a2006-10-11 01:21:01 -0700183 * Wrappers for jbd2_journal_start/end.
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700184 *
185 * The only special thing we need to do here is to make sure that all
186 * journal_end calls result in the superblock being marked dirty, so
187 * that sync() will call the filesystem's write_super callback if
188 * appropriate.
189 */
Mingming Cao617ba132006-10-11 01:20:53 -0700190handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700191{
192 journal_t *journal;
193
194 if (sb->s_flags & MS_RDONLY)
195 return ERR_PTR(-EROFS);
196
197 /* Special case here: if the journal has aborted behind our
198 * backs (eg. EIO in the commit thread), then we still need to
199 * take the FS itself readonly cleanly. */
Mingming Cao617ba132006-10-11 01:20:53 -0700200 journal = EXT4_SB(sb)->s_journal;
Frank Mayhar03901312009-01-07 00:06:22 -0500201 if (journal) {
202 if (is_journal_aborted(journal)) {
203 ext4_abort(sb, __func__,
204 "Detected aborted journal");
205 return ERR_PTR(-EROFS);
206 }
207 return jbd2_journal_start(journal, nblocks);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700208 }
Frank Mayhar03901312009-01-07 00:06:22 -0500209 /*
210 * We're not journaling, return the appropriate indication.
211 */
212 current->journal_info = EXT4_NOJOURNAL_HANDLE;
213 return current->journal_info;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700214}
215
216/*
217 * The only special thing we need to do here is to make sure that all
Mingming Caodab291a2006-10-11 01:21:01 -0700218 * jbd2_journal_stop calls result in the superblock being marked dirty, so
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700219 * that sync() will call the filesystem's write_super callback if
220 * appropriate.
221 */
Mingming Cao617ba132006-10-11 01:20:53 -0700222int __ext4_journal_stop(const char *where, handle_t *handle)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700223{
224 struct super_block *sb;
225 int err;
226 int rc;
227
Frank Mayhar03901312009-01-07 00:06:22 -0500228 if (!ext4_handle_valid(handle)) {
229 /*
230 * Do this here since we don't call jbd2_journal_stop() in
231 * no-journal mode.
232 */
233 current->journal_info = NULL;
234 return 0;
235 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700236 sb = handle->h_transaction->t_journal->j_private;
237 err = handle->h_err;
Mingming Caodab291a2006-10-11 01:21:01 -0700238 rc = jbd2_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700239
240 if (!err)
241 err = rc;
242 if (err)
Mingming Cao617ba132006-10-11 01:20:53 -0700243 __ext4_std_error(sb, where, err);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700244 return err;
245}
246
Mingming Cao617ba132006-10-11 01:20:53 -0700247void ext4_journal_abort_handle(const char *caller, const char *err_fn,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700248 struct buffer_head *bh, handle_t *handle, int err)
249{
250 char nbuf[16];
Mingming Cao617ba132006-10-11 01:20:53 -0700251 const char *errstr = ext4_decode_error(NULL, err, nbuf);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700252
Frank Mayhar03901312009-01-07 00:06:22 -0500253 BUG_ON(!ext4_handle_valid(handle));
254
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700255 if (bh)
256 BUFFER_TRACE(bh, "abort");
257
258 if (!handle->h_err)
259 handle->h_err = err;
260
261 if (is_handle_aborted(handle))
262 return;
263
264 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
265 caller, errstr, err_fn);
266
Mingming Caodab291a2006-10-11 01:21:01 -0700267 jbd2_journal_abort_handle(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700268}
269
270/* Deal with the reporting of failure conditions on a filesystem such as
271 * inconsistencies detected or read IO failures.
272 *
273 * On ext2, we can store the error state of the filesystem in the
Mingming Cao617ba132006-10-11 01:20:53 -0700274 * superblock. That is not possible on ext4, because we may have other
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700275 * write ordering constraints on the superblock which prevent us from
276 * writing it out straight away; and given that the journal is about to
277 * be aborted, we can't rely on the current, or future, transactions to
278 * write out the superblock safely.
279 *
Mingming Caodab291a2006-10-11 01:21:01 -0700280 * We'll just use the jbd2_journal_abort() error code to record an error in
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700281 * the journal instead. On recovery, the journal will compain about
282 * that error until we've noted it down and cleared it.
283 */
284
Mingming Cao617ba132006-10-11 01:20:53 -0700285static void ext4_handle_error(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700286{
Mingming Cao617ba132006-10-11 01:20:53 -0700287 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700288
Mingming Cao617ba132006-10-11 01:20:53 -0700289 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
290 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700291
292 if (sb->s_flags & MS_RDONLY)
293 return;
294
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400295 if (!test_opt(sb, ERRORS_CONT)) {
Mingming Cao617ba132006-10-11 01:20:53 -0700296 journal_t *journal = EXT4_SB(sb)->s_journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700297
Mingming Cao617ba132006-10-11 01:20:53 -0700298 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700299 if (journal)
Mingming Caodab291a2006-10-11 01:21:01 -0700300 jbd2_journal_abort(journal, -EIO);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700301 }
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400302 if (test_opt(sb, ERRORS_RO)) {
303 printk(KERN_CRIT "Remounting filesystem read-only\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700304 sb->s_flags |= MS_RDONLY;
305 }
Mingming Cao617ba132006-10-11 01:20:53 -0700306 ext4_commit_super(sb, es, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700307 if (test_opt(sb, ERRORS_PANIC))
Mingming Cao617ba132006-10-11 01:20:53 -0700308 panic("EXT4-fs (device %s): panic forced after error\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700309 sb->s_id);
310}
311
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400312void ext4_error(struct super_block *sb, const char *function,
313 const char *fmt, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700314{
315 va_list args;
316
317 va_start(args, fmt);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400318 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700319 vprintk(fmt, args);
320 printk("\n");
321 va_end(args);
322
Mingming Cao617ba132006-10-11 01:20:53 -0700323 ext4_handle_error(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700324}
325
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400326static const char *ext4_decode_error(struct super_block *sb, int errno,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700327 char nbuf[16])
328{
329 char *errstr = NULL;
330
331 switch (errno) {
332 case -EIO:
333 errstr = "IO failure";
334 break;
335 case -ENOMEM:
336 errstr = "Out of memory";
337 break;
338 case -EROFS:
Mingming Caodab291a2006-10-11 01:21:01 -0700339 if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700340 errstr = "Journal has aborted";
341 else
342 errstr = "Readonly filesystem";
343 break;
344 default:
345 /* If the caller passed in an extra buffer for unknown
346 * errors, textualise them now. Else we just return
347 * NULL. */
348 if (nbuf) {
349 /* Check for truncated error codes... */
350 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
351 errstr = nbuf;
352 }
353 break;
354 }
355
356 return errstr;
357}
358
Mingming Cao617ba132006-10-11 01:20:53 -0700359/* __ext4_std_error decodes expected errors from journaling functions
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700360 * automatically and invokes the appropriate error response. */
361
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400362void __ext4_std_error(struct super_block *sb, const char *function, int errno)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700363{
364 char nbuf[16];
365 const char *errstr;
366
367 /* Special case: if the error is EROFS, and we're not already
368 * inside a transaction, then there's really no point in logging
369 * an error. */
370 if (errno == -EROFS && journal_current_handle() == NULL &&
371 (sb->s_flags & MS_RDONLY))
372 return;
373
Mingming Cao617ba132006-10-11 01:20:53 -0700374 errstr = ext4_decode_error(sb, errno, nbuf);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400375 printk(KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n",
376 sb->s_id, function, errstr);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700377
Mingming Cao617ba132006-10-11 01:20:53 -0700378 ext4_handle_error(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700379}
380
381/*
Mingming Cao617ba132006-10-11 01:20:53 -0700382 * ext4_abort is a much stronger failure handler than ext4_error. The
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700383 * abort function may be used to deal with unrecoverable failures such
384 * as journal IO errors or ENOMEM at a critical moment in log management.
385 *
386 * We unconditionally force the filesystem into an ABORT|READONLY state,
387 * unless the error response on the fs has been set to panic in which
388 * case we take the easy way out and panic immediately.
389 */
390
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400391void ext4_abort(struct super_block *sb, const char *function,
392 const char *fmt, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700393{
394 va_list args;
395
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400396 printk(KERN_CRIT "ext4_abort called.\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700397
398 va_start(args, fmt);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400399 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700400 vprintk(fmt, args);
401 printk("\n");
402 va_end(args);
403
404 if (test_opt(sb, ERRORS_PANIC))
Mingming Cao617ba132006-10-11 01:20:53 -0700405 panic("EXT4-fs panic from previous error\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700406
407 if (sb->s_flags & MS_RDONLY)
408 return;
409
410 printk(KERN_CRIT "Remounting filesystem read-only\n");
Mingming Cao617ba132006-10-11 01:20:53 -0700411 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700412 sb->s_flags |= MS_RDONLY;
Mingming Cao617ba132006-10-11 01:20:53 -0700413 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
Hidehiro Kawaief2cabf2008-10-27 22:53:05 -0400414 if (EXT4_SB(sb)->s_journal)
415 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700416}
417
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400418void ext4_warning(struct super_block *sb, const char *function,
419 const char *fmt, ...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700420{
421 va_list args;
422
423 va_start(args, fmt);
Mingming Cao617ba132006-10-11 01:20:53 -0700424 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ",
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700425 sb->s_id, function);
426 vprintk(fmt, args);
427 printk("\n");
428 va_end(args);
429}
430
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -0500431void ext4_grp_locked_error(struct super_block *sb, ext4_group_t grp,
432 const char *function, const char *fmt, ...)
433__releases(bitlock)
434__acquires(bitlock)
435{
436 va_list args;
437 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
438
439 va_start(args, fmt);
440 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
441 vprintk(fmt, args);
442 printk("\n");
443 va_end(args);
444
445 if (test_opt(sb, ERRORS_CONT)) {
446 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
447 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
448 ext4_commit_super(sb, es, 0);
449 return;
450 }
451 ext4_unlock_group(sb, grp);
452 ext4_handle_error(sb);
453 /*
454 * We only get here in the ERRORS_RO case; relocking the group
455 * may be dangerous, but nothing bad will happen since the
456 * filesystem will have already been marked read/only and the
457 * journal has been aborted. We return 1 as a hint to callers
458 * who might what to use the return value from
459 * ext4_grp_locked_error() to distinguish beween the
460 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
461 * aggressively from the ext4 function in question, with a
462 * more appropriate error code.
463 */
464 ext4_lock_group(sb, grp);
465 return;
466}
467
468
Mingming Cao617ba132006-10-11 01:20:53 -0700469void ext4_update_dynamic_rev(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700470{
Mingming Cao617ba132006-10-11 01:20:53 -0700471 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700472
Mingming Cao617ba132006-10-11 01:20:53 -0700473 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700474 return;
475
Harvey Harrison46e665e2008-04-17 10:38:59 -0400476 ext4_warning(sb, __func__,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700477 "updating to rev %d because of new feature flag, "
478 "running e2fsck is recommended",
Mingming Cao617ba132006-10-11 01:20:53 -0700479 EXT4_DYNAMIC_REV);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700480
Mingming Cao617ba132006-10-11 01:20:53 -0700481 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
482 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
483 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700484 /* leave es->s_feature_*compat flags alone */
485 /* es->s_uuid will be set by e2fsck if empty */
486
487 /*
488 * The rest of the superblock fields should be zero, and if not it
489 * means they are likely already in use, so leave them alone. We
490 * can leave it up to e2fsck to clean up any inconsistencies there.
491 */
492}
493
494/*
495 * Open the external journal device
496 */
Mingming Cao617ba132006-10-11 01:20:53 -0700497static struct block_device *ext4_blkdev_get(dev_t dev)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700498{
499 struct block_device *bdev;
500 char b[BDEVNAME_SIZE];
501
502 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
503 if (IS_ERR(bdev))
504 goto fail;
505 return bdev;
506
507fail:
Theodore Ts'oabda1412009-01-06 00:20:32 -0500508 printk(KERN_ERR "EXT4-fs: failed to open journal device %s: %ld\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700509 __bdevname(dev, b), PTR_ERR(bdev));
510 return NULL;
511}
512
513/*
514 * Release the journal device
515 */
Mingming Cao617ba132006-10-11 01:20:53 -0700516static int ext4_blkdev_put(struct block_device *bdev)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700517{
518 bd_release(bdev);
Al Viro9a1c3542008-02-22 20:40:24 -0500519 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700520}
521
Mingming Cao617ba132006-10-11 01:20:53 -0700522static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700523{
524 struct block_device *bdev;
525 int ret = -ENODEV;
526
527 bdev = sbi->journal_bdev;
528 if (bdev) {
Mingming Cao617ba132006-10-11 01:20:53 -0700529 ret = ext4_blkdev_put(bdev);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700530 sbi->journal_bdev = NULL;
531 }
532 return ret;
533}
534
535static inline struct inode *orphan_list_entry(struct list_head *l)
536{
Mingming Cao617ba132006-10-11 01:20:53 -0700537 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700538}
539
Mingming Cao617ba132006-10-11 01:20:53 -0700540static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700541{
542 struct list_head *l;
543
544 printk(KERN_ERR "sb orphan head is %d\n",
545 le32_to_cpu(sbi->s_es->s_last_orphan));
546
547 printk(KERN_ERR "sb_info orphan list:\n");
548 list_for_each(l, &sbi->s_orphan) {
549 struct inode *inode = orphan_list_entry(l);
550 printk(KERN_ERR " "
551 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
552 inode->i_sb->s_id, inode->i_ino, inode,
553 inode->i_mode, inode->i_nlink,
554 NEXT_ORPHAN(inode));
555 }
556}
557
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400558static void ext4_put_super(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700559{
Mingming Cao617ba132006-10-11 01:20:53 -0700560 struct ext4_sb_info *sbi = EXT4_SB(sb);
561 struct ext4_super_block *es = sbi->s_es;
Hidehiro Kawaief2cabf2008-10-27 22:53:05 -0400562 int i, err;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700563
Alex Tomasc9de5602008-01-29 00:19:52 -0500564 ext4_mb_release(sb);
Alex Tomasa86c6182006-10-11 01:21:03 -0700565 ext4_ext_release(sb);
Mingming Cao617ba132006-10-11 01:20:53 -0700566 ext4_xattr_put_super(sb);
Frank Mayhar03901312009-01-07 00:06:22 -0500567 if (sbi->s_journal) {
568 err = jbd2_journal_destroy(sbi->s_journal);
569 sbi->s_journal = NULL;
570 if (err < 0)
571 ext4_abort(sb, __func__,
572 "Couldn't clean up the journal");
573 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700574 if (!(sb->s_flags & MS_RDONLY)) {
Mingming Cao617ba132006-10-11 01:20:53 -0700575 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700576 es->s_state = cpu_to_le16(sbi->s_mount_state);
Mingming Cao617ba132006-10-11 01:20:53 -0700577 ext4_commit_super(sb, es, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700578 }
Theodore Ts'o240799c2008-10-09 23:53:47 -0400579 if (sbi->s_proc) {
580 remove_proc_entry("inode_readahead_blks", sbi->s_proc);
Theodore Ts'o9f6200b2008-09-23 09:18:24 -0400581 remove_proc_entry(sb->s_id, ext4_proc_root);
Theodore Ts'o240799c2008-10-09 23:53:47 -0400582 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700583
584 for (i = 0; i < sbi->s_gdb_count; i++)
585 brelse(sbi->s_group_desc[i]);
586 kfree(sbi->s_group_desc);
Jose R. Santos772cb7c2008-07-11 19:27:31 -0400587 kfree(sbi->s_flex_groups);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700588 percpu_counter_destroy(&sbi->s_freeblocks_counter);
589 percpu_counter_destroy(&sbi->s_freeinodes_counter);
590 percpu_counter_destroy(&sbi->s_dirs_counter);
Aneesh Kumar K.V6bc6e632008-10-10 09:39:00 -0400591 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700592 brelse(sbi->s_sbh);
593#ifdef CONFIG_QUOTA
594 for (i = 0; i < MAXQUOTAS; i++)
595 kfree(sbi->s_qf_names[i]);
596#endif
597
598 /* Debugging code just in case the in-memory inode orphan list
599 * isn't empty. The on-disk one can be non-empty if we've
600 * detected an error and taken the fs readonly, but the
601 * in-memory list had better be clean by this point. */
602 if (!list_empty(&sbi->s_orphan))
603 dump_orphan_list(sb, sbi);
604 J_ASSERT(list_empty(&sbi->s_orphan));
605
Peter Zijlstraf98393a2007-05-06 14:49:54 -0700606 invalidate_bdev(sb->s_bdev);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700607 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
608 /*
609 * Invalidate the journal device's buffers. We don't want them
610 * floating about in memory - the physical journal device may
611 * hotswapped, and it breaks the `ro-after' testing code.
612 */
613 sync_blockdev(sbi->journal_bdev);
Peter Zijlstraf98393a2007-05-06 14:49:54 -0700614 invalidate_bdev(sbi->journal_bdev);
Mingming Cao617ba132006-10-11 01:20:53 -0700615 ext4_blkdev_remove(sbi);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700616 }
617 sb->s_fs_info = NULL;
618 kfree(sbi);
619 return;
620}
621
Christoph Lametere18b8902006-12-06 20:33:20 -0800622static struct kmem_cache *ext4_inode_cachep;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700623
624/*
625 * Called inside transaction, so use GFP_NOFS
626 */
Mingming Cao617ba132006-10-11 01:20:53 -0700627static struct inode *ext4_alloc_inode(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700628{
Mingming Cao617ba132006-10-11 01:20:53 -0700629 struct ext4_inode_info *ei;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700630
Christoph Lametere6b4f8d2006-12-06 20:33:14 -0800631 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700632 if (!ei)
633 return NULL;
Theodore Ts'o03010a32008-10-10 20:02:48 -0400634#ifdef CONFIG_EXT4_FS_POSIX_ACL
Mingming Cao617ba132006-10-11 01:20:53 -0700635 ei->i_acl = EXT4_ACL_NOT_CACHED;
636 ei->i_default_acl = EXT4_ACL_NOT_CACHED;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700637#endif
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700638 ei->vfs_inode.i_version = 1;
Aneesh Kumar K.V91246c02008-08-19 21:14:52 -0400639 ei->vfs_inode.i_data.writeback_index = 0;
Alex Tomasa86c6182006-10-11 01:21:03 -0700640 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
Alex Tomasc9de5602008-01-29 00:19:52 -0500641 INIT_LIST_HEAD(&ei->i_prealloc_list);
642 spin_lock_init(&ei->i_prealloc_lock);
Frank Mayhar03901312009-01-07 00:06:22 -0500643 /*
644 * Note: We can be called before EXT4_SB(sb)->s_journal is set,
645 * therefore it can be null here. Don't check it, just initialize
646 * jinode.
647 */
Jan Kara678aaf42008-07-11 19:27:31 -0400648 jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode);
Mingming Caod2a17632008-07-14 17:52:37 -0400649 ei->i_reserved_data_blocks = 0;
650 ei->i_reserved_meta_blocks = 0;
651 ei->i_allocated_meta_blocks = 0;
652 ei->i_delalloc_reserved_flag = 0;
653 spin_lock_init(&(ei->i_block_reservation_lock));
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700654 return &ei->vfs_inode;
655}
656
Mingming Cao617ba132006-10-11 01:20:53 -0700657static void ext4_destroy_inode(struct inode *inode)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700658{
Vasily Averin9f7dd932007-07-15 23:40:45 -0700659 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
660 printk("EXT4 Inode %p: orphan list check failed!\n",
661 EXT4_I(inode));
662 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
663 EXT4_I(inode), sizeof(struct ext4_inode_info),
664 true);
665 dump_stack();
666 }
Mingming Cao617ba132006-10-11 01:20:53 -0700667 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700668}
669
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700670static void init_once(void *foo)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700671{
Mingming Cao617ba132006-10-11 01:20:53 -0700672 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700673
Christoph Lametera35afb82007-05-16 22:10:57 -0700674 INIT_LIST_HEAD(&ei->i_orphan);
Theodore Ts'o03010a32008-10-10 20:02:48 -0400675#ifdef CONFIG_EXT4_FS_XATTR
Christoph Lametera35afb82007-05-16 22:10:57 -0700676 init_rwsem(&ei->xattr_sem);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700677#endif
Aneesh Kumar K.V0e855ac2008-01-28 23:58:26 -0500678 init_rwsem(&ei->i_data_sem);
Christoph Lametera35afb82007-05-16 22:10:57 -0700679 inode_init_once(&ei->vfs_inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700680}
681
682static int init_inodecache(void)
683{
Mingming Cao617ba132006-10-11 01:20:53 -0700684 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
685 sizeof(struct ext4_inode_info),
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700686 0, (SLAB_RECLAIM_ACCOUNT|
687 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900688 init_once);
Mingming Cao617ba132006-10-11 01:20:53 -0700689 if (ext4_inode_cachep == NULL)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700690 return -ENOMEM;
691 return 0;
692}
693
694static void destroy_inodecache(void)
695{
Mingming Cao617ba132006-10-11 01:20:53 -0700696 kmem_cache_destroy(ext4_inode_cachep);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700697}
698
Mingming Cao617ba132006-10-11 01:20:53 -0700699static void ext4_clear_inode(struct inode *inode)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700700{
Theodore Ts'o03010a32008-10-10 20:02:48 -0400701#ifdef CONFIG_EXT4_FS_POSIX_ACL
Mingming Cao617ba132006-10-11 01:20:53 -0700702 if (EXT4_I(inode)->i_acl &&
703 EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) {
704 posix_acl_release(EXT4_I(inode)->i_acl);
705 EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700706 }
Mingming Cao617ba132006-10-11 01:20:53 -0700707 if (EXT4_I(inode)->i_default_acl &&
708 EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) {
709 posix_acl_release(EXT4_I(inode)->i_default_acl);
710 EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700711 }
712#endif
Theodore Ts'oc2ea3fd2008-10-10 09:40:52 -0400713 ext4_discard_preallocations(inode);
Frank Mayhar03901312009-01-07 00:06:22 -0500714 if (EXT4_JOURNAL(inode))
715 jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal,
Jan Kara678aaf42008-07-11 19:27:31 -0400716 &EXT4_I(inode)->jinode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700717}
718
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400719static inline void ext4_show_quota_options(struct seq_file *seq,
720 struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700721{
722#if defined(CONFIG_QUOTA)
Mingming Cao617ba132006-10-11 01:20:53 -0700723 struct ext4_sb_info *sbi = EXT4_SB(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700724
725 if (sbi->s_jquota_fmt)
726 seq_printf(seq, ",jqfmt=%s",
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400727 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold" : "vfsv0");
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700728
729 if (sbi->s_qf_names[USRQUOTA])
730 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
731
732 if (sbi->s_qf_names[GRPQUOTA])
733 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
734
Mingming Cao617ba132006-10-11 01:20:53 -0700735 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700736 seq_puts(seq, ",usrquota");
737
Mingming Cao617ba132006-10-11 01:20:53 -0700738 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700739 seq_puts(seq, ",grpquota");
740#endif
741}
742
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700743/*
744 * Show an option if
745 * - it's set to a non-default value OR
746 * - if the per-sb default is different from the global default
747 */
Mingming Cao617ba132006-10-11 01:20:53 -0700748static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700749{
Aneesh Kumar K.Vaa22df22008-01-28 23:58:27 -0500750 int def_errors;
751 unsigned long def_mount_opts;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700752 struct super_block *sb = vfs->mnt_sb;
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700753 struct ext4_sb_info *sbi = EXT4_SB(sb);
754 struct ext4_super_block *es = sbi->s_es;
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700755
756 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
Aneesh Kumar K.Vaa22df22008-01-28 23:58:27 -0500757 def_errors = le16_to_cpu(es->s_errors);
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700758
759 if (sbi->s_sb_block != 1)
760 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
761 if (test_opt(sb, MINIX_DF))
762 seq_puts(seq, ",minixdf");
Aneesh Kumar K.Vaa22df22008-01-28 23:58:27 -0500763 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700764 seq_puts(seq, ",grpid");
765 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
766 seq_puts(seq, ",nogrpid");
767 if (sbi->s_resuid != EXT4_DEF_RESUID ||
768 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
769 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
770 }
771 if (sbi->s_resgid != EXT4_DEF_RESGID ||
772 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
773 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
774 }
Aneesh Kumar K.Vbb4f3972008-01-28 23:58:26 -0500775 if (test_opt(sb, ERRORS_RO)) {
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700776 if (def_errors == EXT4_ERRORS_PANIC ||
Aneesh Kumar K.Vbb4f3972008-01-28 23:58:26 -0500777 def_errors == EXT4_ERRORS_CONTINUE) {
778 seq_puts(seq, ",errors=remount-ro");
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700779 }
780 }
Aneesh Kumar K.Vaa22df22008-01-28 23:58:27 -0500781 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
Aneesh Kumar K.Vbb4f3972008-01-28 23:58:26 -0500782 seq_puts(seq, ",errors=continue");
Aneesh Kumar K.Vaa22df22008-01-28 23:58:27 -0500783 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700784 seq_puts(seq, ",errors=panic");
Aneesh Kumar K.Vaa22df22008-01-28 23:58:27 -0500785 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700786 seq_puts(seq, ",nouid32");
Aneesh Kumar K.Vaa22df22008-01-28 23:58:27 -0500787 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700788 seq_puts(seq, ",debug");
789 if (test_opt(sb, OLDALLOC))
790 seq_puts(seq, ",oldalloc");
Theodore Ts'o03010a32008-10-10 20:02:48 -0400791#ifdef CONFIG_EXT4_FS_XATTR
Aneesh Kumar K.Vaa22df22008-01-28 23:58:27 -0500792 if (test_opt(sb, XATTR_USER) &&
793 !(def_mount_opts & EXT4_DEFM_XATTR_USER))
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700794 seq_puts(seq, ",user_xattr");
795 if (!test_opt(sb, XATTR_USER) &&
796 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
797 seq_puts(seq, ",nouser_xattr");
798 }
799#endif
Theodore Ts'o03010a32008-10-10 20:02:48 -0400800#ifdef CONFIG_EXT4_FS_POSIX_ACL
Aneesh Kumar K.Vaa22df22008-01-28 23:58:27 -0500801 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700802 seq_puts(seq, ",acl");
803 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
804 seq_puts(seq, ",noacl");
805#endif
806 if (!test_opt(sb, RESERVATION))
807 seq_puts(seq, ",noreservation");
Theodore Ts'o30773842009-01-03 20:27:38 -0500808 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700809 seq_printf(seq, ",commit=%u",
810 (unsigned) (sbi->s_commit_interval / HZ));
811 }
Theodore Ts'o30773842009-01-03 20:27:38 -0500812 if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) {
813 seq_printf(seq, ",min_batch_time=%u",
814 (unsigned) sbi->s_min_batch_time);
815 }
816 if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) {
817 seq_printf(seq, ",max_batch_time=%u",
818 (unsigned) sbi->s_min_batch_time);
819 }
820
Eric Sandeen571640c2008-05-26 12:29:46 -0400821 /*
822 * We're changing the default of barrier mount option, so
823 * let's always display its mount state so it's clear what its
824 * status is.
825 */
826 seq_puts(seq, ",barrier=");
827 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
Theodore Ts'ocd0b6a32008-05-26 10:28:28 -0400828 if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
829 seq_puts(seq, ",journal_async_commit");
Miklos Szeredid9c9bef12007-10-16 23:26:27 -0700830 if (test_opt(sb, NOBH))
831 seq_puts(seq, ",nobh");
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -0500832 if (test_opt(sb, I_VERSION))
833 seq_puts(seq, ",i_version");
Aneesh Kumar K.Vdd919b92008-07-11 19:27:31 -0400834 if (!test_opt(sb, DELALLOC))
835 seq_puts(seq, ",nodelalloc");
836
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700837
Miklos Szeredicb45bbe2008-01-28 23:58:27 -0500838 if (sbi->s_stripe)
839 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
Aneesh Kumar K.Vaa22df22008-01-28 23:58:27 -0500840 /*
841 * journal mode get enabled in different ways
842 * So just print the value even if we didn't specify it
843 */
Mingming Cao617ba132006-10-11 01:20:53 -0700844 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700845 seq_puts(seq, ",data=journal");
Mingming Cao617ba132006-10-11 01:20:53 -0700846 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700847 seq_puts(seq, ",data=ordered");
Mingming Cao617ba132006-10-11 01:20:53 -0700848 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700849 seq_puts(seq, ",data=writeback");
850
Theodore Ts'o240799c2008-10-09 23:53:47 -0400851 if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
852 seq_printf(seq, ",inode_readahead_blks=%u",
853 sbi->s_inode_readahead_blks);
854
Hidehiro Kawai5bf56832008-10-10 22:12:43 -0400855 if (test_opt(sb, DATA_ERR_ABORT))
856 seq_puts(seq, ",data_err=abort");
857
Mingming Cao617ba132006-10-11 01:20:53 -0700858 ext4_show_quota_options(seq, sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700859 return 0;
860}
861
862
Christoph Hellwig1b961ac2007-10-21 16:42:08 -0700863static struct inode *ext4_nfs_get_inode(struct super_block *sb,
864 u64 ino, u32 generation)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700865{
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700866 struct inode *inode;
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700867
Mingming Cao617ba132006-10-11 01:20:53 -0700868 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700869 return ERR_PTR(-ESTALE);
Mingming Cao617ba132006-10-11 01:20:53 -0700870 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700871 return ERR_PTR(-ESTALE);
872
873 /* iget isn't really right if the inode is currently unallocated!!
874 *
Mingming Cao617ba132006-10-11 01:20:53 -0700875 * ext4_read_inode will return a bad_inode if the inode had been
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700876 * deleted, so we should be safe.
877 *
878 * Currently we don't know the generation for parent directory, so
879 * a generation of 0 means "accept any"
880 */
David Howells1d1fe1e2008-02-07 00:15:37 -0800881 inode = ext4_iget(sb, ino);
882 if (IS_ERR(inode))
883 return ERR_CAST(inode);
884 if (generation && inode->i_generation != generation) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700885 iput(inode);
886 return ERR_PTR(-ESTALE);
887 }
Christoph Hellwig1b961ac2007-10-21 16:42:08 -0700888
889 return inode;
890}
891
892static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
893 int fh_len, int fh_type)
894{
895 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
896 ext4_nfs_get_inode);
897}
898
899static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
900 int fh_len, int fh_type)
901{
902 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
903 ext4_nfs_get_inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700904}
905
Toshiyuki Okajimac39a7f82009-01-05 22:38:48 -0500906/*
907 * Try to release metadata pages (indirect blocks, directories) which are
908 * mapped via the block device. Since these pages could have journal heads
909 * which would prevent try_to_free_buffers() from freeing them, we must use
910 * jbd2 layer's try_to_free_buffers() function to release them.
911 */
912static int bdev_try_to_free_page(struct super_block *sb, struct page *page, gfp_t wait)
913{
914 journal_t *journal = EXT4_SB(sb)->s_journal;
915
916 WARN_ON(PageChecked(page));
917 if (!page_has_buffers(page))
918 return 0;
919 if (journal)
920 return jbd2_journal_try_to_free_buffers(journal, page,
921 wait & ~__GFP_WAIT);
922 return try_to_free_buffers(page);
923}
924
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700925#ifdef CONFIG_QUOTA
Theodore Ts'oaf5bc922008-09-08 22:25:24 -0400926#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -0400927#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700928
Mingming Cao617ba132006-10-11 01:20:53 -0700929static int ext4_write_dquot(struct dquot *dquot);
930static int ext4_acquire_dquot(struct dquot *dquot);
931static int ext4_release_dquot(struct dquot *dquot);
932static int ext4_mark_dquot_dirty(struct dquot *dquot);
933static int ext4_write_info(struct super_block *sb, int type);
Jan Kara6f28e082008-04-28 02:14:34 -0700934static int ext4_quota_on(struct super_block *sb, int type, int format_id,
935 char *path, int remount);
Mingming Cao617ba132006-10-11 01:20:53 -0700936static int ext4_quota_on_mount(struct super_block *sb, int type);
937static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700938 size_t len, loff_t off);
Mingming Cao617ba132006-10-11 01:20:53 -0700939static ssize_t ext4_quota_write(struct super_block *sb, int type,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700940 const char *data, size_t len, loff_t off);
941
Mingming Cao617ba132006-10-11 01:20:53 -0700942static struct dquot_operations ext4_quota_operations = {
Jan Karaedf72452009-01-12 19:05:26 +0100943 .initialize = dquot_initialize,
944 .drop = dquot_drop,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700945 .alloc_space = dquot_alloc_space,
Mingming Cao60e58e02009-01-22 18:13:05 +0100946 .reserve_space = dquot_reserve_space,
947 .claim_space = dquot_claim_space,
948 .release_rsv = dquot_release_reserved_space,
949 .get_reserved_space = ext4_get_reserved_space,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700950 .alloc_inode = dquot_alloc_inode,
951 .free_space = dquot_free_space,
952 .free_inode = dquot_free_inode,
953 .transfer = dquot_transfer,
Mingming Cao617ba132006-10-11 01:20:53 -0700954 .write_dquot = ext4_write_dquot,
955 .acquire_dquot = ext4_acquire_dquot,
956 .release_dquot = ext4_release_dquot,
957 .mark_dirty = ext4_mark_dquot_dirty,
Jan Karaa5b5ee32008-11-25 15:31:35 +0100958 .write_info = ext4_write_info,
959 .alloc_dquot = dquot_alloc,
960 .destroy_dquot = dquot_destroy,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700961};
962
Mingming Cao617ba132006-10-11 01:20:53 -0700963static struct quotactl_ops ext4_qctl_operations = {
964 .quota_on = ext4_quota_on,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700965 .quota_off = vfs_quota_off,
966 .quota_sync = vfs_quota_sync,
967 .get_info = vfs_get_dqinfo,
968 .set_info = vfs_set_dqinfo,
969 .get_dqblk = vfs_get_dqblk,
970 .set_dqblk = vfs_set_dqblk
971};
972#endif
973
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800974static const struct super_operations ext4_sops = {
Mingming Cao617ba132006-10-11 01:20:53 -0700975 .alloc_inode = ext4_alloc_inode,
976 .destroy_inode = ext4_destroy_inode,
Mingming Cao617ba132006-10-11 01:20:53 -0700977 .write_inode = ext4_write_inode,
978 .dirty_inode = ext4_dirty_inode,
979 .delete_inode = ext4_delete_inode,
980 .put_super = ext4_put_super,
981 .write_super = ext4_write_super,
982 .sync_fs = ext4_sync_fs,
Takashi Satoc4be0c12009-01-09 16:40:58 -0800983 .freeze_fs = ext4_freeze,
984 .unfreeze_fs = ext4_unfreeze,
Mingming Cao617ba132006-10-11 01:20:53 -0700985 .statfs = ext4_statfs,
986 .remount_fs = ext4_remount,
987 .clear_inode = ext4_clear_inode,
988 .show_options = ext4_show_options,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700989#ifdef CONFIG_QUOTA
Mingming Cao617ba132006-10-11 01:20:53 -0700990 .quota_read = ext4_quota_read,
991 .quota_write = ext4_quota_write,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700992#endif
Toshiyuki Okajimac39a7f82009-01-05 22:38:48 -0500993 .bdev_try_to_free_page = bdev_try_to_free_page,
Dave Kleikampac27a0e2006-10-11 01:20:50 -0700994};
995
Christoph Hellwig39655162007-10-21 16:42:17 -0700996static const struct export_operations ext4_export_ops = {
Christoph Hellwig1b961ac2007-10-21 16:42:08 -0700997 .fh_to_dentry = ext4_fh_to_dentry,
998 .fh_to_parent = ext4_fh_to_parent,
Mingming Cao617ba132006-10-11 01:20:53 -0700999 .get_parent = ext4_get_parent,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001000};
1001
1002enum {
1003 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1004 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
Theodore Ts'o01436ef2008-10-17 07:22:35 -04001005 Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001006 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1007 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
Theodore Ts'o30773842009-01-03 20:27:38 -05001008 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
Theodore Ts'oc3191062009-01-06 11:14:25 -05001009 Opt_journal_update, Opt_journal_dev,
Girish Shilamkar818d2762008-01-28 23:58:27 -05001010 Opt_journal_checksum, Opt_journal_async_commit,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001011 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
Hidehiro Kawai5bf56832008-10-10 22:12:43 -04001012 Opt_data_err_abort, Opt_data_err_ignore,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001013 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1014 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
1015 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
Theodore Ts'o83982b62009-01-06 14:53:16 -05001016 Opt_grpquota, Opt_i_version,
Theodore Ts'o01436ef2008-10-17 07:22:35 -04001017 Opt_stripe, Opt_delalloc, Opt_nodelalloc,
Theodore Ts'ob3881f72009-01-05 22:46:26 -05001018 Opt_inode_readahead_blks, Opt_journal_ioprio
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001019};
1020
Steven Whitehousea447c092008-10-13 10:46:57 +01001021static const match_table_t tokens = {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001022 {Opt_bsd_df, "bsddf"},
1023 {Opt_minix_df, "minixdf"},
1024 {Opt_grpid, "grpid"},
1025 {Opt_grpid, "bsdgroups"},
1026 {Opt_nogrpid, "nogrpid"},
1027 {Opt_nogrpid, "sysvgroups"},
1028 {Opt_resgid, "resgid=%u"},
1029 {Opt_resuid, "resuid=%u"},
1030 {Opt_sb, "sb=%u"},
1031 {Opt_err_cont, "errors=continue"},
1032 {Opt_err_panic, "errors=panic"},
1033 {Opt_err_ro, "errors=remount-ro"},
1034 {Opt_nouid32, "nouid32"},
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001035 {Opt_debug, "debug"},
1036 {Opt_oldalloc, "oldalloc"},
1037 {Opt_orlov, "orlov"},
1038 {Opt_user_xattr, "user_xattr"},
1039 {Opt_nouser_xattr, "nouser_xattr"},
1040 {Opt_acl, "acl"},
1041 {Opt_noacl, "noacl"},
1042 {Opt_reservation, "reservation"},
1043 {Opt_noreservation, "noreservation"},
1044 {Opt_noload, "noload"},
1045 {Opt_nobh, "nobh"},
1046 {Opt_bh, "bh"},
1047 {Opt_commit, "commit=%u"},
Theodore Ts'o30773842009-01-03 20:27:38 -05001048 {Opt_min_batch_time, "min_batch_time=%u"},
1049 {Opt_max_batch_time, "max_batch_time=%u"},
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001050 {Opt_journal_update, "journal=update"},
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001051 {Opt_journal_dev, "journal_dev=%u"},
Girish Shilamkar818d2762008-01-28 23:58:27 -05001052 {Opt_journal_checksum, "journal_checksum"},
1053 {Opt_journal_async_commit, "journal_async_commit"},
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001054 {Opt_abort, "abort"},
1055 {Opt_data_journal, "data=journal"},
1056 {Opt_data_ordered, "data=ordered"},
1057 {Opt_data_writeback, "data=writeback"},
Hidehiro Kawai5bf56832008-10-10 22:12:43 -04001058 {Opt_data_err_abort, "data_err=abort"},
1059 {Opt_data_err_ignore, "data_err=ignore"},
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001060 {Opt_offusrjquota, "usrjquota="},
1061 {Opt_usrjquota, "usrjquota=%s"},
1062 {Opt_offgrpjquota, "grpjquota="},
1063 {Opt_grpjquota, "grpjquota=%s"},
1064 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1065 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1066 {Opt_grpquota, "grpquota"},
1067 {Opt_noquota, "noquota"},
1068 {Opt_quota, "quota"},
1069 {Opt_usrquota, "usrquota"},
1070 {Opt_barrier, "barrier=%u"},
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -05001071 {Opt_i_version, "i_version"},
Alex Tomasc9de5602008-01-29 00:19:52 -05001072 {Opt_stripe, "stripe=%u"},
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001073 {Opt_resize, "resize"},
Alex Tomas64769242008-07-11 19:27:31 -04001074 {Opt_delalloc, "delalloc"},
Aneesh Kumar K.Vdd919b92008-07-11 19:27:31 -04001075 {Opt_nodelalloc, "nodelalloc"},
Theodore Ts'o240799c2008-10-09 23:53:47 -04001076 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
Theodore Ts'ob3881f72009-01-05 22:46:26 -05001077 {Opt_journal_ioprio, "journal_ioprio=%u"},
Josef Bacikf3f12fa2008-04-29 22:05:28 -04001078 {Opt_err, NULL},
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001079};
1080
Mingming Cao617ba132006-10-11 01:20:53 -07001081static ext4_fsblk_t get_sb_block(void **data)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001082{
Mingming Cao617ba132006-10-11 01:20:53 -07001083 ext4_fsblk_t sb_block;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001084 char *options = (char *) *data;
1085
1086 if (!options || strncmp(options, "sb=", 3) != 0)
1087 return 1; /* Default location */
1088 options += 3;
Mingming Cao617ba132006-10-11 01:20:53 -07001089 /*todo: use simple_strtoll with >32bit ext4 */
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001090 sb_block = simple_strtoul(options, &options, 0);
1091 if (*options && *options != ',') {
Theodore Ts'o4776004f2008-09-08 23:00:52 -04001092 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001093 (char *) *data);
1094 return 1;
1095 }
1096 if (*options == ',')
1097 options++;
1098 *data = (void *) options;
1099 return sb_block;
1100}
1101
Theodore Ts'ob3881f72009-01-05 22:46:26 -05001102#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1103
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001104static int parse_options(char *options, struct super_block *sb,
Theodore Ts'oc3191062009-01-06 11:14:25 -05001105 unsigned long *journal_devnum,
Theodore Ts'ob3881f72009-01-05 22:46:26 -05001106 unsigned int *journal_ioprio,
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001107 ext4_fsblk_t *n_blocks_count, int is_remount)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001108{
Mingming Cao617ba132006-10-11 01:20:53 -07001109 struct ext4_sb_info *sbi = EXT4_SB(sb);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001110 char *p;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001111 substring_t args[MAX_OPT_ARGS];
1112 int data_opt = 0;
1113 int option;
1114#ifdef CONFIG_QUOTA
Jan Karadfc5d032008-05-13 19:11:51 -04001115 int qtype, qfmt;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001116 char *qname;
1117#endif
1118
1119 if (!options)
1120 return 1;
1121
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001122 while ((p = strsep(&options, ",")) != NULL) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001123 int token;
1124 if (!*p)
1125 continue;
1126
1127 token = match_token(p, tokens, args);
1128 switch (token) {
1129 case Opt_bsd_df:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001130 clear_opt(sbi->s_mount_opt, MINIX_DF);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001131 break;
1132 case Opt_minix_df:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001133 set_opt(sbi->s_mount_opt, MINIX_DF);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001134 break;
1135 case Opt_grpid:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001136 set_opt(sbi->s_mount_opt, GRPID);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001137 break;
1138 case Opt_nogrpid:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001139 clear_opt(sbi->s_mount_opt, GRPID);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001140 break;
1141 case Opt_resuid:
1142 if (match_int(&args[0], &option))
1143 return 0;
1144 sbi->s_resuid = option;
1145 break;
1146 case Opt_resgid:
1147 if (match_int(&args[0], &option))
1148 return 0;
1149 sbi->s_resgid = option;
1150 break;
1151 case Opt_sb:
1152 /* handled by get_sb_block() instead of here */
1153 /* *sb_block = match_int(&args[0]); */
1154 break;
1155 case Opt_err_panic:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001156 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1157 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1158 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001159 break;
1160 case Opt_err_ro:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001161 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1162 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1163 set_opt(sbi->s_mount_opt, ERRORS_RO);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001164 break;
1165 case Opt_err_cont:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001166 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1167 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1168 set_opt(sbi->s_mount_opt, ERRORS_CONT);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001169 break;
1170 case Opt_nouid32:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001171 set_opt(sbi->s_mount_opt, NO_UID32);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001172 break;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001173 case Opt_debug:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001174 set_opt(sbi->s_mount_opt, DEBUG);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001175 break;
1176 case Opt_oldalloc:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001177 set_opt(sbi->s_mount_opt, OLDALLOC);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001178 break;
1179 case Opt_orlov:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001180 clear_opt(sbi->s_mount_opt, OLDALLOC);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001181 break;
Theodore Ts'o03010a32008-10-10 20:02:48 -04001182#ifdef CONFIG_EXT4_FS_XATTR
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001183 case Opt_user_xattr:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001184 set_opt(sbi->s_mount_opt, XATTR_USER);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001185 break;
1186 case Opt_nouser_xattr:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001187 clear_opt(sbi->s_mount_opt, XATTR_USER);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001188 break;
1189#else
1190 case Opt_user_xattr:
1191 case Opt_nouser_xattr:
Theodore Ts'o4776004f2008-09-08 23:00:52 -04001192 printk(KERN_ERR "EXT4 (no)user_xattr options "
1193 "not supported\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001194 break;
1195#endif
Theodore Ts'o03010a32008-10-10 20:02:48 -04001196#ifdef CONFIG_EXT4_FS_POSIX_ACL
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001197 case Opt_acl:
1198 set_opt(sbi->s_mount_opt, POSIX_ACL);
1199 break;
1200 case Opt_noacl:
1201 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1202 break;
1203#else
1204 case Opt_acl:
1205 case Opt_noacl:
Theodore Ts'o4776004f2008-09-08 23:00:52 -04001206 printk(KERN_ERR "EXT4 (no)acl options "
1207 "not supported\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001208 break;
1209#endif
1210 case Opt_reservation:
1211 set_opt(sbi->s_mount_opt, RESERVATION);
1212 break;
1213 case Opt_noreservation:
1214 clear_opt(sbi->s_mount_opt, RESERVATION);
1215 break;
1216 case Opt_journal_update:
1217 /* @@@ FIXME */
1218 /* Eventually we will want to be able to create
1219 a journal file here. For now, only allow the
1220 user to specify an existing inode to be the
1221 journal file. */
1222 if (is_remount) {
Mingming Cao617ba132006-10-11 01:20:53 -07001223 printk(KERN_ERR "EXT4-fs: cannot specify "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001224 "journal on remount\n");
1225 return 0;
1226 }
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001227 set_opt(sbi->s_mount_opt, UPDATE_JOURNAL);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001228 break;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001229 case Opt_journal_dev:
1230 if (is_remount) {
Mingming Cao617ba132006-10-11 01:20:53 -07001231 printk(KERN_ERR "EXT4-fs: cannot specify "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001232 "journal on remount\n");
1233 return 0;
1234 }
1235 if (match_int(&args[0], &option))
1236 return 0;
1237 *journal_devnum = option;
1238 break;
Girish Shilamkar818d2762008-01-28 23:58:27 -05001239 case Opt_journal_checksum:
1240 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1241 break;
1242 case Opt_journal_async_commit:
1243 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
1244 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1245 break;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001246 case Opt_noload:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001247 set_opt(sbi->s_mount_opt, NOLOAD);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001248 break;
1249 case Opt_commit:
1250 if (match_int(&args[0], &option))
1251 return 0;
1252 if (option < 0)
1253 return 0;
1254 if (option == 0)
Mingming Caocd02ff02007-10-16 18:38:25 -04001255 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001256 sbi->s_commit_interval = HZ * option;
1257 break;
Theodore Ts'o30773842009-01-03 20:27:38 -05001258 case Opt_max_batch_time:
1259 if (match_int(&args[0], &option))
1260 return 0;
1261 if (option < 0)
1262 return 0;
1263 if (option == 0)
1264 option = EXT4_DEF_MAX_BATCH_TIME;
1265 sbi->s_max_batch_time = option;
1266 break;
1267 case Opt_min_batch_time:
1268 if (match_int(&args[0], &option))
1269 return 0;
1270 if (option < 0)
1271 return 0;
1272 sbi->s_min_batch_time = option;
1273 break;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001274 case Opt_data_journal:
Mingming Cao617ba132006-10-11 01:20:53 -07001275 data_opt = EXT4_MOUNT_JOURNAL_DATA;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001276 goto datacheck;
1277 case Opt_data_ordered:
Mingming Cao617ba132006-10-11 01:20:53 -07001278 data_opt = EXT4_MOUNT_ORDERED_DATA;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001279 goto datacheck;
1280 case Opt_data_writeback:
Mingming Cao617ba132006-10-11 01:20:53 -07001281 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001282 datacheck:
1283 if (is_remount) {
Mingming Cao617ba132006-10-11 01:20:53 -07001284 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001285 != data_opt) {
1286 printk(KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001287 "EXT4-fs: cannot change data "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001288 "mode on remount\n");
1289 return 0;
1290 }
1291 } else {
Mingming Cao617ba132006-10-11 01:20:53 -07001292 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001293 sbi->s_mount_opt |= data_opt;
1294 }
1295 break;
Hidehiro Kawai5bf56832008-10-10 22:12:43 -04001296 case Opt_data_err_abort:
1297 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1298 break;
1299 case Opt_data_err_ignore:
1300 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1301 break;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001302#ifdef CONFIG_QUOTA
1303 case Opt_usrjquota:
1304 qtype = USRQUOTA;
1305 goto set_qf_name;
1306 case Opt_grpjquota:
1307 qtype = GRPQUOTA;
1308set_qf_name:
Jan Kara17bd13b2008-08-20 18:14:35 +02001309 if (sb_any_quota_loaded(sb) &&
Jan Karadfc5d032008-05-13 19:11:51 -04001310 !sbi->s_qf_names[qtype]) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001311 printk(KERN_ERR
Theodore Ts'o4776004f2008-09-08 23:00:52 -04001312 "EXT4-fs: Cannot change journaled "
1313 "quota options when quota turned on.\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001314 return 0;
1315 }
1316 qname = match_strdup(&args[0]);
1317 if (!qname) {
1318 printk(KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001319 "EXT4-fs: not enough memory for "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001320 "storing quotafile name.\n");
1321 return 0;
1322 }
1323 if (sbi->s_qf_names[qtype] &&
1324 strcmp(sbi->s_qf_names[qtype], qname)) {
1325 printk(KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001326 "EXT4-fs: %s quota file already "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001327 "specified.\n", QTYPE2NAME(qtype));
1328 kfree(qname);
1329 return 0;
1330 }
1331 sbi->s_qf_names[qtype] = qname;
1332 if (strchr(sbi->s_qf_names[qtype], '/')) {
1333 printk(KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07001334 "EXT4-fs: quotafile must be on "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001335 "filesystem root.\n");
1336 kfree(sbi->s_qf_names[qtype]);
1337 sbi->s_qf_names[qtype] = NULL;
1338 return 0;
1339 }
1340 set_opt(sbi->s_mount_opt, QUOTA);
1341 break;
1342 case Opt_offusrjquota:
1343 qtype = USRQUOTA;
1344 goto clear_qf_name;
1345 case Opt_offgrpjquota:
1346 qtype = GRPQUOTA;
1347clear_qf_name:
Jan Kara17bd13b2008-08-20 18:14:35 +02001348 if (sb_any_quota_loaded(sb) &&
Jan Karadfc5d032008-05-13 19:11:51 -04001349 sbi->s_qf_names[qtype]) {
Mingming Cao617ba132006-10-11 01:20:53 -07001350 printk(KERN_ERR "EXT4-fs: Cannot change "
Jan Kara2c8be6b2008-05-13 21:27:55 -04001351 "journaled quota options when "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001352 "quota turned on.\n");
1353 return 0;
1354 }
1355 /*
1356 * The space will be released later when all options
1357 * are confirmed to be correct
1358 */
1359 sbi->s_qf_names[qtype] = NULL;
1360 break;
1361 case Opt_jqfmt_vfsold:
Jan Karadfc5d032008-05-13 19:11:51 -04001362 qfmt = QFMT_VFS_OLD;
1363 goto set_qf_format;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001364 case Opt_jqfmt_vfsv0:
Jan Karadfc5d032008-05-13 19:11:51 -04001365 qfmt = QFMT_VFS_V0;
1366set_qf_format:
Jan Kara17bd13b2008-08-20 18:14:35 +02001367 if (sb_any_quota_loaded(sb) &&
Jan Karadfc5d032008-05-13 19:11:51 -04001368 sbi->s_jquota_fmt != qfmt) {
1369 printk(KERN_ERR "EXT4-fs: Cannot change "
1370 "journaled quota options when "
1371 "quota turned on.\n");
1372 return 0;
1373 }
1374 sbi->s_jquota_fmt = qfmt;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001375 break;
1376 case Opt_quota:
1377 case Opt_usrquota:
1378 set_opt(sbi->s_mount_opt, QUOTA);
1379 set_opt(sbi->s_mount_opt, USRQUOTA);
1380 break;
1381 case Opt_grpquota:
1382 set_opt(sbi->s_mount_opt, QUOTA);
1383 set_opt(sbi->s_mount_opt, GRPQUOTA);
1384 break;
1385 case Opt_noquota:
Jan Kara17bd13b2008-08-20 18:14:35 +02001386 if (sb_any_quota_loaded(sb)) {
Mingming Cao617ba132006-10-11 01:20:53 -07001387 printk(KERN_ERR "EXT4-fs: Cannot change quota "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001388 "options when quota turned on.\n");
1389 return 0;
1390 }
1391 clear_opt(sbi->s_mount_opt, QUOTA);
1392 clear_opt(sbi->s_mount_opt, USRQUOTA);
1393 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1394 break;
1395#else
1396 case Opt_quota:
1397 case Opt_usrquota:
1398 case Opt_grpquota:
Jan Karacd59e7b2008-05-13 19:11:51 -04001399 printk(KERN_ERR
1400 "EXT4-fs: quota options not supported.\n");
1401 break;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001402 case Opt_usrjquota:
1403 case Opt_grpjquota:
1404 case Opt_offusrjquota:
1405 case Opt_offgrpjquota:
1406 case Opt_jqfmt_vfsold:
1407 case Opt_jqfmt_vfsv0:
1408 printk(KERN_ERR
Jan Karacd59e7b2008-05-13 19:11:51 -04001409 "EXT4-fs: journaled quota options not "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001410 "supported.\n");
1411 break;
1412 case Opt_noquota:
1413 break;
1414#endif
1415 case Opt_abort:
1416 set_opt(sbi->s_mount_opt, ABORT);
1417 break;
1418 case Opt_barrier:
1419 if (match_int(&args[0], &option))
1420 return 0;
1421 if (option)
1422 set_opt(sbi->s_mount_opt, BARRIER);
1423 else
1424 clear_opt(sbi->s_mount_opt, BARRIER);
1425 break;
1426 case Opt_ignore:
1427 break;
1428 case Opt_resize:
1429 if (!is_remount) {
Mingming Cao617ba132006-10-11 01:20:53 -07001430 printk("EXT4-fs: resize option only available "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001431 "for remount\n");
1432 return 0;
1433 }
1434 if (match_int(&args[0], &option) != 0)
1435 return 0;
1436 *n_blocks_count = option;
1437 break;
1438 case Opt_nobh:
1439 set_opt(sbi->s_mount_opt, NOBH);
1440 break;
1441 case Opt_bh:
1442 clear_opt(sbi->s_mount_opt, NOBH);
1443 break;
Jean Noel Cordenner25ec56b2008-01-28 23:58:27 -05001444 case Opt_i_version:
1445 set_opt(sbi->s_mount_opt, I_VERSION);
1446 sb->s_flags |= MS_I_VERSION;
1447 break;
Aneesh Kumar K.Vdd919b92008-07-11 19:27:31 -04001448 case Opt_nodelalloc:
1449 clear_opt(sbi->s_mount_opt, DELALLOC);
1450 break;
Alex Tomasc9de5602008-01-29 00:19:52 -05001451 case Opt_stripe:
1452 if (match_int(&args[0], &option))
1453 return 0;
1454 if (option < 0)
1455 return 0;
1456 sbi->s_stripe = option;
1457 break;
Alex Tomas64769242008-07-11 19:27:31 -04001458 case Opt_delalloc:
1459 set_opt(sbi->s_mount_opt, DELALLOC);
1460 break;
Theodore Ts'o240799c2008-10-09 23:53:47 -04001461 case Opt_inode_readahead_blks:
1462 if (match_int(&args[0], &option))
1463 return 0;
1464 if (option < 0 || option > (1 << 30))
1465 return 0;
1466 sbi->s_inode_readahead_blks = option;
1467 break;
Theodore Ts'ob3881f72009-01-05 22:46:26 -05001468 case Opt_journal_ioprio:
1469 if (match_int(&args[0], &option))
1470 return 0;
1471 if (option < 0 || option > 7)
1472 break;
1473 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE,
1474 option);
1475 break;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001476 default:
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001477 printk(KERN_ERR
1478 "EXT4-fs: Unrecognized mount option \"%s\" "
1479 "or missing value\n", p);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001480 return 0;
1481 }
1482 }
1483#ifdef CONFIG_QUOTA
1484 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
Mingming Cao617ba132006-10-11 01:20:53 -07001485 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001486 sbi->s_qf_names[USRQUOTA])
1487 clear_opt(sbi->s_mount_opt, USRQUOTA);
1488
Mingming Cao617ba132006-10-11 01:20:53 -07001489 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001490 sbi->s_qf_names[GRPQUOTA])
1491 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1492
1493 if ((sbi->s_qf_names[USRQUOTA] &&
Mingming Cao617ba132006-10-11 01:20:53 -07001494 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001495 (sbi->s_qf_names[GRPQUOTA] &&
Mingming Cao617ba132006-10-11 01:20:53 -07001496 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
1497 printk(KERN_ERR "EXT4-fs: old and new quota "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001498 "format mixing.\n");
1499 return 0;
1500 }
1501
1502 if (!sbi->s_jquota_fmt) {
Jan Kara2c8be6b2008-05-13 21:27:55 -04001503 printk(KERN_ERR "EXT4-fs: journaled quota format "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001504 "not specified.\n");
1505 return 0;
1506 }
1507 } else {
1508 if (sbi->s_jquota_fmt) {
Jan Kara2c8be6b2008-05-13 21:27:55 -04001509 printk(KERN_ERR "EXT4-fs: journaled quota format "
1510 "specified with no journaling "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001511 "enabled.\n");
1512 return 0;
1513 }
1514 }
1515#endif
1516 return 1;
1517}
1518
Mingming Cao617ba132006-10-11 01:20:53 -07001519static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001520 int read_only)
1521{
Mingming Cao617ba132006-10-11 01:20:53 -07001522 struct ext4_sb_info *sbi = EXT4_SB(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001523 int res = 0;
1524
Mingming Cao617ba132006-10-11 01:20:53 -07001525 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001526 printk(KERN_ERR "EXT4-fs warning: revision level too high, "
1527 "forcing read-only mode\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001528 res = MS_RDONLY;
1529 }
1530 if (read_only)
1531 return res;
Mingming Cao617ba132006-10-11 01:20:53 -07001532 if (!(sbi->s_mount_state & EXT4_VALID_FS))
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001533 printk(KERN_WARNING "EXT4-fs warning: mounting unchecked fs, "
1534 "running e2fsck is recommended\n");
Mingming Cao617ba132006-10-11 01:20:53 -07001535 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001536 printk(KERN_WARNING
1537 "EXT4-fs warning: mounting fs with errors, "
1538 "running e2fsck is recommended\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001539 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1540 le16_to_cpu(es->s_mnt_count) >=
1541 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001542 printk(KERN_WARNING
1543 "EXT4-fs warning: maximal mount count reached, "
1544 "running e2fsck is recommended\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001545 else if (le32_to_cpu(es->s_checkinterval) &&
1546 (le32_to_cpu(es->s_lastcheck) +
1547 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001548 printk(KERN_WARNING
1549 "EXT4-fs warning: checktime reached, "
1550 "running e2fsck is recommended\n");
Frank Mayhar03901312009-01-07 00:06:22 -05001551 if (!sbi->s_journal)
1552 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001553 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
Mingming Cao617ba132006-10-11 01:20:53 -07001554 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
Marcin Slusarze8546d02008-04-17 10:38:59 -04001555 le16_add_cpu(&es->s_mnt_count, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001556 es->s_mtime = cpu_to_le32(get_seconds());
Mingming Cao617ba132006-10-11 01:20:53 -07001557 ext4_update_dynamic_rev(sb);
Frank Mayhar03901312009-01-07 00:06:22 -05001558 if (sbi->s_journal)
1559 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001560
Mingming Cao617ba132006-10-11 01:20:53 -07001561 ext4_commit_super(sb, es, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001562 if (test_opt(sb, DEBUG))
Theodore Ts'oa9df9a42009-01-05 22:18:16 -05001563 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001564 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1565 sb->s_blocksize,
1566 sbi->s_groups_count,
Mingming Cao617ba132006-10-11 01:20:53 -07001567 EXT4_BLOCKS_PER_GROUP(sb),
1568 EXT4_INODES_PER_GROUP(sb),
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001569 sbi->s_mount_opt);
1570
Frank Mayhar03901312009-01-07 00:06:22 -05001571 if (EXT4_SB(sb)->s_journal) {
1572 printk(KERN_INFO "EXT4 FS on %s, %s journal on %s\n",
1573 sb->s_id, EXT4_SB(sb)->s_journal->j_inode ? "internal" :
1574 "external", EXT4_SB(sb)->s_journal->j_devname);
1575 } else {
1576 printk(KERN_INFO "EXT4 FS on %s, no journal\n", sb->s_id);
1577 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001578 return res;
1579}
1580
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001581static int ext4_fill_flex_info(struct super_block *sb)
1582{
1583 struct ext4_sb_info *sbi = EXT4_SB(sb);
1584 struct ext4_group_desc *gdp = NULL;
1585 struct buffer_head *bh;
1586 ext4_group_t flex_group_count;
1587 ext4_group_t flex_group;
1588 int groups_per_flex = 0;
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001589 int i;
1590
1591 if (!sbi->s_es->s_log_groups_per_flex) {
1592 sbi->s_log_groups_per_flex = 0;
1593 return 1;
1594 }
1595
1596 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1597 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1598
Frederic Bohec62a11f2008-09-08 10:20:24 -04001599 /* We allocate both existing and potentially added groups */
1600 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
Aneesh Kumar K.Vd94e99a2008-11-04 09:11:26 -05001601 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1602 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
Li Zefanec05e862008-07-24 12:49:59 -04001603 sbi->s_flex_groups = kzalloc(flex_group_count *
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001604 sizeof(struct flex_groups), GFP_KERNEL);
1605 if (sbi->s_flex_groups == NULL) {
Li Zefanec05e862008-07-24 12:49:59 -04001606 printk(KERN_ERR "EXT4-fs: not enough memory for "
Theodore Ts'oa9df9a42009-01-05 22:18:16 -05001607 "%u flex groups\n", flex_group_count);
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001608 goto failed;
1609 }
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001610
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001611 for (i = 0; i < sbi->s_groups_count; i++) {
1612 gdp = ext4_get_group_desc(sb, i, &bh);
1613
1614 flex_group = ext4_flex_group(sbi, i);
1615 sbi->s_flex_groups[flex_group].free_inodes +=
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -05001616 ext4_free_inodes_count(sb, gdp);
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001617 sbi->s_flex_groups[flex_group].free_blocks +=
Aneesh Kumar K.V560671a2009-01-05 22:20:24 -05001618 ext4_free_blks_count(sb, gdp);
Jose R. Santos772cb7c2008-07-11 19:27:31 -04001619 }
1620
1621 return 1;
1622failed:
1623 return 0;
1624}
1625
Andreas Dilger717d50e2007-10-16 18:38:25 -04001626__le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1627 struct ext4_group_desc *gdp)
1628{
1629 __u16 crc = 0;
1630
1631 if (sbi->s_es->s_feature_ro_compat &
1632 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1633 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1634 __le32 le_group = cpu_to_le32(block_group);
1635
1636 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1637 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1638 crc = crc16(crc, (__u8 *)gdp, offset);
1639 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1640 /* for checksum of struct ext4_group_desc do the rest...*/
1641 if ((sbi->s_es->s_feature_incompat &
1642 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1643 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1644 crc = crc16(crc, (__u8 *)gdp + offset,
1645 le16_to_cpu(sbi->s_es->s_desc_size) -
1646 offset);
1647 }
1648
1649 return cpu_to_le16(crc);
1650}
1651
1652int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1653 struct ext4_group_desc *gdp)
1654{
1655 if ((sbi->s_es->s_feature_ro_compat &
1656 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1657 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1658 return 0;
1659
1660 return 1;
1661}
1662
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001663/* Called at mount-time, super-block is locked */
Akinobu Mita197cd65a2008-02-06 01:40:16 -08001664static int ext4_check_descriptors(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001665{
Mingming Cao617ba132006-10-11 01:20:53 -07001666 struct ext4_sb_info *sbi = EXT4_SB(sb);
1667 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1668 ext4_fsblk_t last_block;
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001669 ext4_fsblk_t block_bitmap;
1670 ext4_fsblk_t inode_bitmap;
1671 ext4_fsblk_t inode_table;
Jose R. Santosce421582007-10-16 18:38:25 -04001672 int flexbg_flag = 0;
Avantika Mathurfd2d4292008-01-28 23:58:27 -05001673 ext4_group_t i;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001674
Jose R. Santosce421582007-10-16 18:38:25 -04001675 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1676 flexbg_flag = 1;
1677
Theodore Ts'oaf5bc922008-09-08 22:25:24 -04001678 ext4_debug("Checking group descriptors");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001679
Akinobu Mita197cd65a2008-02-06 01:40:16 -08001680 for (i = 0; i < sbi->s_groups_count; i++) {
1681 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1682
Jose R. Santosce421582007-10-16 18:38:25 -04001683 if (i == sbi->s_groups_count - 1 || flexbg_flag)
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001684 last_block = ext4_blocks_count(sbi->s_es) - 1;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001685 else
1686 last_block = first_block +
Mingming Cao617ba132006-10-11 01:20:53 -07001687 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001688
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07001689 block_bitmap = ext4_block_bitmap(sb, gdp);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001690 if (block_bitmap < first_block || block_bitmap > last_block) {
Josef Bacikc19204b2008-04-29 22:00:28 -04001691 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
Theodore Ts'oa9df9a42009-01-05 22:18:16 -05001692 "Block bitmap for group %u not in group "
Eric Sesterhenn51282732008-10-17 09:16:19 -04001693 "(block %llu)!\n", i, block_bitmap);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001694 return 0;
1695 }
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07001696 inode_bitmap = ext4_inode_bitmap(sb, gdp);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001697 if (inode_bitmap < first_block || inode_bitmap > last_block) {
Josef Bacikc19204b2008-04-29 22:00:28 -04001698 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
Theodore Ts'oa9df9a42009-01-05 22:18:16 -05001699 "Inode bitmap for group %u not in group "
Eric Sesterhenn51282732008-10-17 09:16:19 -04001700 "(block %llu)!\n", i, inode_bitmap);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001701 return 0;
1702 }
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07001703 inode_table = ext4_inode_table(sb, gdp);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001704 if (inode_table < first_block ||
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001705 inode_table + sbi->s_itb_per_group - 1 > last_block) {
Josef Bacikc19204b2008-04-29 22:00:28 -04001706 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
Theodore Ts'oa9df9a42009-01-05 22:18:16 -05001707 "Inode table for group %u not in group "
Eric Sesterhenn51282732008-10-17 09:16:19 -04001708 "(block %llu)!\n", i, inode_table);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001709 return 0;
1710 }
Eric Sandeenb5f10ee2008-08-02 21:21:08 -04001711 spin_lock(sb_bgl_lock(sbi, i));
Andreas Dilger717d50e2007-10-16 18:38:25 -04001712 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
Josef Bacikc19204b2008-04-29 22:00:28 -04001713 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
Theodore Ts'oa9df9a42009-01-05 22:18:16 -05001714 "Checksum for group %u failed (%u!=%u)\n",
Josef Bacikc19204b2008-04-29 22:00:28 -04001715 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
1716 gdp)), le16_to_cpu(gdp->bg_checksum));
Li Zefan7ee1ec42008-09-08 10:47:19 -04001717 if (!(sb->s_flags & MS_RDONLY)) {
1718 spin_unlock(sb_bgl_lock(sbi, i));
Theodore Ts'o8a266462008-07-26 14:34:21 -04001719 return 0;
Li Zefan7ee1ec42008-09-08 10:47:19 -04001720 }
Andreas Dilger717d50e2007-10-16 18:38:25 -04001721 }
Eric Sandeenb5f10ee2008-08-02 21:21:08 -04001722 spin_unlock(sb_bgl_lock(sbi, i));
Jose R. Santosce421582007-10-16 18:38:25 -04001723 if (!flexbg_flag)
1724 first_block += EXT4_BLOCKS_PER_GROUP(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001725 }
1726
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07001727 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001728 sbi->s_es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001729 return 1;
1730}
1731
Mingming Cao617ba132006-10-11 01:20:53 -07001732/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001733 * the superblock) which were deleted from all directories, but held open by
1734 * a process at the time of a crash. We walk the list and try to delete these
1735 * inodes at recovery time (only with a read-write filesystem).
1736 *
1737 * In order to keep the orphan inode chain consistent during traversal (in
1738 * case of crash during recovery), we link each inode into the superblock
1739 * orphan list_head and handle it the same way as an inode deletion during
1740 * normal operation (which journals the operations for us).
1741 *
1742 * We only do an iget() and an iput() on each inode, which is very safe if we
1743 * accidentally point at an in-use or already deleted inode. The worst that
1744 * can happen in this case is that we get a "bit already cleared" message from
Mingming Cao617ba132006-10-11 01:20:53 -07001745 * ext4_free_inode(). The only reason we would point at a wrong inode is if
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001746 * e2fsck was run on this filesystem, and it must have already done the orphan
1747 * inode cleanup for us, so we can safely abort without any further action.
1748 */
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001749static void ext4_orphan_cleanup(struct super_block *sb,
1750 struct ext4_super_block *es)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001751{
1752 unsigned int s_flags = sb->s_flags;
1753 int nr_orphans = 0, nr_truncates = 0;
1754#ifdef CONFIG_QUOTA
1755 int i;
1756#endif
1757 if (!es->s_last_orphan) {
1758 jbd_debug(4, "no orphan inodes to clean up\n");
1759 return;
1760 }
1761
Eric Sandeena8f48a92006-12-06 20:40:13 -08001762 if (bdev_read_only(sb->s_bdev)) {
1763 printk(KERN_ERR "EXT4-fs: write access "
1764 "unavailable, skipping orphan cleanup.\n");
1765 return;
1766 }
1767
Mingming Cao617ba132006-10-11 01:20:53 -07001768 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001769 if (es->s_last_orphan)
1770 jbd_debug(1, "Errors on filesystem, "
1771 "clearing orphan list.\n");
1772 es->s_last_orphan = 0;
1773 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1774 return;
1775 }
1776
1777 if (s_flags & MS_RDONLY) {
Mingming Cao617ba132006-10-11 01:20:53 -07001778 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001779 sb->s_id);
1780 sb->s_flags &= ~MS_RDONLY;
1781 }
1782#ifdef CONFIG_QUOTA
1783 /* Needed for iput() to work correctly and not trash data */
1784 sb->s_flags |= MS_ACTIVE;
1785 /* Turn on quotas so that they are updated correctly */
1786 for (i = 0; i < MAXQUOTAS; i++) {
Mingming Cao617ba132006-10-11 01:20:53 -07001787 if (EXT4_SB(sb)->s_qf_names[i]) {
1788 int ret = ext4_quota_on_mount(sb, i);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001789 if (ret < 0)
1790 printk(KERN_ERR
Jan Kara2c8be6b2008-05-13 21:27:55 -04001791 "EXT4-fs: Cannot turn on journaled "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001792 "quota: error %d\n", ret);
1793 }
1794 }
1795#endif
1796
1797 while (es->s_last_orphan) {
1798 struct inode *inode;
1799
Josef Bacik97bd42b2008-04-29 22:04:56 -04001800 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1801 if (IS_ERR(inode)) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001802 es->s_last_orphan = 0;
1803 break;
1804 }
1805
Mingming Cao617ba132006-10-11 01:20:53 -07001806 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
Jan Karaa269eb12009-01-26 17:04:39 +01001807 vfs_dq_init(inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001808 if (inode->i_nlink) {
1809 printk(KERN_DEBUG
Theodore Ts'oe5f8eab82008-09-08 22:25:04 -04001810 "%s: truncating inode %lu to %lld bytes\n",
Harvey Harrison46e665e2008-04-17 10:38:59 -04001811 __func__, inode->i_ino, inode->i_size);
Theodore Ts'oe5f8eab82008-09-08 22:25:04 -04001812 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001813 inode->i_ino, inode->i_size);
Mingming Cao617ba132006-10-11 01:20:53 -07001814 ext4_truncate(inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001815 nr_truncates++;
1816 } else {
1817 printk(KERN_DEBUG
1818 "%s: deleting unreferenced inode %lu\n",
Harvey Harrison46e665e2008-04-17 10:38:59 -04001819 __func__, inode->i_ino);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001820 jbd_debug(2, "deleting unreferenced inode %lu\n",
1821 inode->i_ino);
1822 nr_orphans++;
1823 }
1824 iput(inode); /* The delete magic happens here! */
1825 }
1826
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001827#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001828
1829 if (nr_orphans)
Mingming Cao617ba132006-10-11 01:20:53 -07001830 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001831 sb->s_id, PLURAL(nr_orphans));
1832 if (nr_truncates)
Mingming Cao617ba132006-10-11 01:20:53 -07001833 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001834 sb->s_id, PLURAL(nr_truncates));
1835#ifdef CONFIG_QUOTA
1836 /* Turn quotas off */
1837 for (i = 0; i < MAXQUOTAS; i++) {
1838 if (sb_dqopt(sb)->files[i])
Jan Kara6f28e082008-04-28 02:14:34 -07001839 vfs_quota_off(sb, i, 0);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001840 }
1841#endif
1842 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1843}
Eric Sandeencd2291a2008-01-28 23:58:27 -05001844/*
1845 * Maximal extent format file size.
1846 * Resulting logical blkno at s_maxbytes must fit in our on-disk
1847 * extent format containers, within a sector_t, and within i_blocks
1848 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
1849 * so that won't be a limiting factor.
1850 *
1851 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1852 */
Theodore Ts'of287a1a2008-10-16 22:50:48 -04001853static loff_t ext4_max_size(int blkbits, int has_huge_files)
Eric Sandeencd2291a2008-01-28 23:58:27 -05001854{
1855 loff_t res;
1856 loff_t upper_limit = MAX_LFS_FILESIZE;
1857
1858 /* small i_blocks in vfs inode? */
Theodore Ts'of287a1a2008-10-16 22:50:48 -04001859 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
Eric Sandeencd2291a2008-01-28 23:58:27 -05001860 /*
Jens Axboeb3a6ffe2008-12-12 09:51:16 +01001861 * CONFIG_LBD is not enabled implies the inode
Eric Sandeencd2291a2008-01-28 23:58:27 -05001862 * i_block represent total blocks in 512 bytes
1863 * 32 == size of vfs inode i_blocks * 8
1864 */
1865 upper_limit = (1LL << 32) - 1;
1866
1867 /* total blocks in file system block size */
1868 upper_limit >>= (blkbits - 9);
1869 upper_limit <<= blkbits;
1870 }
1871
1872 /* 32-bit extent-start container, ee_block */
1873 res = 1LL << 32;
1874 res <<= blkbits;
1875 res -= 1;
1876
1877 /* Sanity check against vm- & vfs- imposed limits */
1878 if (res > upper_limit)
1879 res = upper_limit;
1880
1881 return res;
1882}
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001883
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001884/*
Eric Sandeencd2291a2008-01-28 23:58:27 -05001885 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001886 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
1887 * We need to be 1 filesystem block less than the 2^48 sector limit.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001888 */
Theodore Ts'of287a1a2008-10-16 22:50:48 -04001889static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001890{
Mingming Cao617ba132006-10-11 01:20:53 -07001891 loff_t res = EXT4_NDIR_BLOCKS;
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001892 int meta_blocks;
1893 loff_t upper_limit;
1894 /* This is calculated to be the largest file size for a
Eric Sandeencd2291a2008-01-28 23:58:27 -05001895 * dense, bitmapped file such that the total number of
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001896 * sectors in the file, including data and all indirect blocks,
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001897 * does not exceed 2^48 -1
1898 * __u32 i_blocks_lo and _u16 i_blocks_high representing the
1899 * total number of 512 bytes blocks of the file
1900 */
1901
Theodore Ts'of287a1a2008-10-16 22:50:48 -04001902 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001903 /*
Jens Axboeb3a6ffe2008-12-12 09:51:16 +01001904 * !has_huge_files or CONFIG_LBD is not enabled
Theodore Ts'of287a1a2008-10-16 22:50:48 -04001905 * implies the inode i_block represent total blocks in
1906 * 512 bytes 32 == size of vfs inode i_blocks * 8
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001907 */
1908 upper_limit = (1LL << 32) - 1;
1909
1910 /* total blocks in file system block size */
1911 upper_limit >>= (bits - 9);
1912
1913 } else {
Aneesh Kumar K.V8180a562008-01-28 23:58:27 -05001914 /*
1915 * We use 48 bit ext4_inode i_blocks
1916 * With EXT4_HUGE_FILE_FL set the i_blocks
1917 * represent total number of blocks in
1918 * file system block size
1919 */
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001920 upper_limit = (1LL << 48) - 1;
1921
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001922 }
1923
1924 /* indirect blocks */
1925 meta_blocks = 1;
1926 /* double indirect blocks */
1927 meta_blocks += 1 + (1LL << (bits-2));
1928 /* tripple indirect blocks */
1929 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1930
1931 upper_limit -= meta_blocks;
1932 upper_limit <<= bits;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001933
1934 res += 1LL << (bits-2);
1935 res += 1LL << (2*(bits-2));
1936 res += 1LL << (3*(bits-2));
1937 res <<= bits;
1938 if (res > upper_limit)
1939 res = upper_limit;
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05001940
1941 if (res > MAX_LFS_FILESIZE)
1942 res = MAX_LFS_FILESIZE;
1943
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001944 return res;
1945}
1946
Mingming Cao617ba132006-10-11 01:20:53 -07001947static ext4_fsblk_t descriptor_loc(struct super_block *sb,
Andrew Morton70bbb3e2006-10-11 01:21:20 -07001948 ext4_fsblk_t logical_sb_block, int nr)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001949{
Mingming Cao617ba132006-10-11 01:20:53 -07001950 struct ext4_sb_info *sbi = EXT4_SB(sb);
Avantika Mathurfd2d4292008-01-28 23:58:27 -05001951 ext4_group_t bg, first_meta_bg;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001952 int has_super = 0;
1953
1954 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1955
Mingming Cao617ba132006-10-11 01:20:53 -07001956 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001957 nr < first_meta_bg)
Andrew Morton70bbb3e2006-10-11 01:21:20 -07001958 return logical_sb_block + nr + 1;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001959 bg = sbi->s_desc_per_block * nr;
Mingming Cao617ba132006-10-11 01:20:53 -07001960 if (ext4_bg_has_super(sb, bg))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001961 has_super = 1;
Mingming Cao617ba132006-10-11 01:20:53 -07001962 return (has_super + ext4_group_first_block_no(sb, bg));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001963}
1964
Alex Tomasc9de5602008-01-29 00:19:52 -05001965/**
1966 * ext4_get_stripe_size: Get the stripe size.
1967 * @sbi: In memory super block info
1968 *
1969 * If we have specified it via mount option, then
1970 * use the mount option value. If the value specified at mount time is
1971 * greater than the blocks per group use the super block value.
1972 * If the super block value is greater than blocks per group return 0.
1973 * Allocator needs it be less than blocks per group.
1974 *
1975 */
1976static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
1977{
1978 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
1979 unsigned long stripe_width =
1980 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
1981
1982 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
1983 return sbi->s_stripe;
1984
1985 if (stripe_width <= sbi->s_blocks_per_group)
1986 return stripe_width;
1987
1988 if (stride <= sbi->s_blocks_per_group)
1989 return stride;
1990
1991 return 0;
1992}
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001993
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001994static int ext4_fill_super(struct super_block *sb, void *data, int silent)
Aneesh Kumar K.V74778272008-07-11 19:27:31 -04001995 __releases(kernel_lock)
1996 __acquires(kernel_lock)
Aneesh Kumar K.V1d03ec92008-01-28 23:58:27 -05001997
Dave Kleikampac27a0e2006-10-11 01:20:50 -07001998{
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04001999 struct buffer_head *bh;
Mingming Cao617ba132006-10-11 01:20:53 -07002000 struct ext4_super_block *es = NULL;
2001 struct ext4_sb_info *sbi;
2002 ext4_fsblk_t block;
2003 ext4_fsblk_t sb_block = get_sb_block(&data);
Andrew Morton70bbb3e2006-10-11 01:21:20 -07002004 ext4_fsblk_t logical_sb_block;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002005 unsigned long offset = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002006 unsigned long journal_devnum = 0;
2007 unsigned long def_mount_opts;
2008 struct inode *root;
Theodore Ts'o9f6200b2008-09-23 09:18:24 -04002009 char *cp;
Frank Mayhar03901312009-01-07 00:06:22 -05002010 const char *descr;
David Howells1d1fe1e2008-02-07 00:15:37 -08002011 int ret = -EINVAL;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002012 int blocksize;
Theodore Ts'o4ec11022009-01-06 14:53:26 -05002013 unsigned int db_count;
2014 unsigned int i;
Theodore Ts'of287a1a2008-10-16 22:50:48 -04002015 int needs_recovery, has_huge_files;
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05002016 int features;
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002017 __u64 blocks_count;
Peter Zijlstra833f4072007-10-16 23:25:45 -07002018 int err;
Theodore Ts'ob3881f72009-01-05 22:46:26 -05002019 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002020
2021 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
2022 if (!sbi)
2023 return -ENOMEM;
2024 sb->s_fs_info = sbi;
2025 sbi->s_mount_opt = 0;
Mingming Cao617ba132006-10-11 01:20:53 -07002026 sbi->s_resuid = EXT4_DEF_RESUID;
2027 sbi->s_resgid = EXT4_DEF_RESGID;
Theodore Ts'o240799c2008-10-09 23:53:47 -04002028 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
Miklos Szeredid9c9bef12007-10-16 23:26:27 -07002029 sbi->s_sb_block = sb_block;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002030
2031 unlock_kernel();
2032
Theodore Ts'o9f6200b2008-09-23 09:18:24 -04002033 /* Cleanup superblock name */
2034 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
2035 *cp = '!';
2036
Mingming Cao617ba132006-10-11 01:20:53 -07002037 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002038 if (!blocksize) {
Mingming Cao617ba132006-10-11 01:20:53 -07002039 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002040 goto out_fail;
2041 }
2042
2043 /*
Mingming Cao617ba132006-10-11 01:20:53 -07002044 * The ext4 superblock will not be buffer aligned for other than 1kB
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002045 * block sizes. We need to calculate the offset from buffer start.
2046 */
Mingming Cao617ba132006-10-11 01:20:53 -07002047 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
Andrew Morton70bbb3e2006-10-11 01:21:20 -07002048 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2049 offset = do_div(logical_sb_block, blocksize);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002050 } else {
Andrew Morton70bbb3e2006-10-11 01:21:20 -07002051 logical_sb_block = sb_block;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002052 }
2053
Andrew Morton70bbb3e2006-10-11 01:21:20 -07002054 if (!(bh = sb_bread(sb, logical_sb_block))) {
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002055 printk(KERN_ERR "EXT4-fs: unable to read superblock\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002056 goto out_fail;
2057 }
2058 /*
2059 * Note: s_es must be initialized as soon as possible because
Mingming Cao617ba132006-10-11 01:20:53 -07002060 * some ext4 macro-instructions depend on its value
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002061 */
Mingming Cao617ba132006-10-11 01:20:53 -07002062 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002063 sbi->s_es = es;
2064 sb->s_magic = le16_to_cpu(es->s_magic);
Mingming Cao617ba132006-10-11 01:20:53 -07002065 if (sb->s_magic != EXT4_SUPER_MAGIC)
2066 goto cantfind_ext4;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002067
2068 /* Set defaults before we parse the mount options */
2069 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
Mingming Cao617ba132006-10-11 01:20:53 -07002070 if (def_mount_opts & EXT4_DEFM_DEBUG)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002071 set_opt(sbi->s_mount_opt, DEBUG);
Mingming Cao617ba132006-10-11 01:20:53 -07002072 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002073 set_opt(sbi->s_mount_opt, GRPID);
Mingming Cao617ba132006-10-11 01:20:53 -07002074 if (def_mount_opts & EXT4_DEFM_UID16)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002075 set_opt(sbi->s_mount_opt, NO_UID32);
Theodore Ts'o03010a32008-10-10 20:02:48 -04002076#ifdef CONFIG_EXT4_FS_XATTR
Mingming Cao617ba132006-10-11 01:20:53 -07002077 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002078 set_opt(sbi->s_mount_opt, XATTR_USER);
Hugh Dickins2e7842b2007-02-10 01:46:13 -08002079#endif
Theodore Ts'o03010a32008-10-10 20:02:48 -04002080#ifdef CONFIG_EXT4_FS_POSIX_ACL
Mingming Cao617ba132006-10-11 01:20:53 -07002081 if (def_mount_opts & EXT4_DEFM_ACL)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002082 set_opt(sbi->s_mount_opt, POSIX_ACL);
Hugh Dickins2e7842b2007-02-10 01:46:13 -08002083#endif
Mingming Cao617ba132006-10-11 01:20:53 -07002084 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
2085 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
2086 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
2087 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
2088 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
2089 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002090
Mingming Cao617ba132006-10-11 01:20:53 -07002091 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002092 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
Aneesh Kumar K.Vbb4f3972008-01-28 23:58:26 -05002093 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
Dmitry Mishinceea16b2006-10-11 01:21:21 -07002094 set_opt(sbi->s_mount_opt, ERRORS_CONT);
Aneesh Kumar K.Vbb4f3972008-01-28 23:58:26 -05002095 else
2096 set_opt(sbi->s_mount_opt, ERRORS_RO);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002097
2098 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
2099 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
Theodore Ts'o30773842009-01-03 20:27:38 -05002100 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
2101 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
2102 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002103
2104 set_opt(sbi->s_mount_opt, RESERVATION);
Eric Sandeen571640c2008-05-26 12:29:46 -04002105 set_opt(sbi->s_mount_opt, BARRIER);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002106
Mingming Cao1e2462f2007-07-18 09:00:55 -04002107 /*
Aneesh Kumar K.Vdd919b92008-07-11 19:27:31 -04002108 * enable delayed allocation by default
2109 * Use -o nodelalloc to turn it off
2110 */
2111 set_opt(sbi->s_mount_opt, DELALLOC);
2112
2113
Theodore Ts'ob3881f72009-01-05 22:46:26 -05002114 if (!parse_options((char *) data, sb, &journal_devnum,
2115 &journal_ioprio, NULL, 0))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002116 goto failed_mount;
2117
2118 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
Mingming Cao617ba132006-10-11 01:20:53 -07002119 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002120
Mingming Cao617ba132006-10-11 01:20:53 -07002121 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
2122 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
2123 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
2124 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002125 printk(KERN_WARNING
Mingming Cao617ba132006-10-11 01:20:53 -07002126 "EXT4-fs warning: feature flags set on rev 0 fs, "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002127 "running e2fsck is recommended\n");
Theodore Tso469108f2008-02-10 01:11:44 -05002128
2129 /*
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002130 * Check feature flags regardless of the revision level, since we
2131 * previously didn't change the revision level when setting the flags,
2132 * so there is a chance incompat flags are set on a rev 0 filesystem.
2133 */
Mingming Cao617ba132006-10-11 01:20:53 -07002134 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002135 if (features) {
Mingming Cao617ba132006-10-11 01:20:53 -07002136 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of "
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05002137 "unsupported optional features (%x).\n", sb->s_id,
2138 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2139 ~EXT4_FEATURE_INCOMPAT_SUPP));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002140 goto failed_mount;
2141 }
Mingming Cao617ba132006-10-11 01:20:53 -07002142 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002143 if (!(sb->s_flags & MS_RDONLY) && features) {
Mingming Cao617ba132006-10-11 01:20:53 -07002144 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of "
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05002145 "unsupported optional features (%x).\n", sb->s_id,
2146 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2147 ~EXT4_FEATURE_RO_COMPAT_SUPP));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002148 goto failed_mount;
2149 }
Theodore Ts'of287a1a2008-10-16 22:50:48 -04002150 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
2151 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
2152 if (has_huge_files) {
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05002153 /*
2154 * Large file size enabled file system can only be
Jens Axboeb3a6ffe2008-12-12 09:51:16 +01002155 * mount if kernel is build with CONFIG_LBD
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05002156 */
2157 if (sizeof(root->i_blocks) < sizeof(u64) &&
2158 !(sb->s_flags & MS_RDONLY)) {
2159 printk(KERN_ERR "EXT4-fs: %s: Filesystem with huge "
2160 "files cannot be mounted read-write "
Jens Axboeb3a6ffe2008-12-12 09:51:16 +01002161 "without CONFIG_LBD.\n", sb->s_id);
Aneesh Kumar K.V0fc1b452008-01-28 23:58:26 -05002162 goto failed_mount;
2163 }
2164 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002165 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
2166
Mingming Cao617ba132006-10-11 01:20:53 -07002167 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
2168 blocksize > EXT4_MAX_BLOCK_SIZE) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002169 printk(KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07002170 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002171 blocksize, sb->s_id);
2172 goto failed_mount;
2173 }
2174
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002175 if (sb->s_blocksize != blocksize) {
Aneesh Kumar K.Vce407332008-01-28 23:58:27 -05002176
2177 /* Validate the filesystem blocksize */
2178 if (!sb_set_blocksize(sb, blocksize)) {
2179 printk(KERN_ERR "EXT4-fs: bad block size %d.\n",
2180 blocksize);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002181 goto failed_mount;
2182 }
2183
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002184 brelse(bh);
Andrew Morton70bbb3e2006-10-11 01:21:20 -07002185 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2186 offset = do_div(logical_sb_block, blocksize);
2187 bh = sb_bread(sb, logical_sb_block);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002188 if (!bh) {
2189 printk(KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07002190 "EXT4-fs: Can't read superblock on 2nd try.\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002191 goto failed_mount;
2192 }
Mingming Cao617ba132006-10-11 01:20:53 -07002193 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002194 sbi->s_es = es;
Mingming Cao617ba132006-10-11 01:20:53 -07002195 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002196 printk(KERN_ERR
2197 "EXT4-fs: Magic mismatch, very weird !\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002198 goto failed_mount;
2199 }
2200 }
2201
Theodore Ts'of287a1a2008-10-16 22:50:48 -04002202 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
2203 has_huge_files);
2204 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002205
Mingming Cao617ba132006-10-11 01:20:53 -07002206 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
2207 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
2208 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002209 } else {
2210 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
2211 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
Mingming Cao617ba132006-10-11 01:20:53 -07002212 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
Vignesh Babu13305932007-07-18 09:11:02 -04002213 (!is_power_of_2(sbi->s_inode_size)) ||
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002214 (sbi->s_inode_size > blocksize)) {
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002215 printk(KERN_ERR
2216 "EXT4-fs: unsupported inode size: %d\n",
2217 sbi->s_inode_size);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002218 goto failed_mount;
2219 }
Kalpak Shahef7f3832007-07-18 09:15:20 -04002220 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
2221 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002222 }
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07002223 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
2224 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07002225 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07002226 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
vignesh babud8ea6cf2007-10-16 23:27:14 -07002227 !is_power_of_2(sbi->s_desc_size)) {
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07002228 printk(KERN_ERR
Alexandre Ratchov8fadc142006-10-11 01:21:15 -07002229 "EXT4-fs: unsupported descriptor size %lu\n",
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07002230 sbi->s_desc_size);
2231 goto failed_mount;
2232 }
2233 } else
2234 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002235 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002236 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
Andries E. Brouwerb47b6f32007-12-17 16:19:55 -08002237 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
Mingming Cao617ba132006-10-11 01:20:53 -07002238 goto cantfind_ext4;
2239 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002240 if (sbi->s_inodes_per_block == 0)
Mingming Cao617ba132006-10-11 01:20:53 -07002241 goto cantfind_ext4;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002242 sbi->s_itb_per_group = sbi->s_inodes_per_group /
2243 sbi->s_inodes_per_block;
Alexandre Ratchov0d1ee422006-10-11 01:21:14 -07002244 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002245 sbi->s_sbh = bh;
2246 sbi->s_mount_state = le16_to_cpu(es->s_state);
Fengguang Wue57aa832007-10-16 23:26:25 -07002247 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
2248 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002249 for (i = 0; i < 4; i++)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002250 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
2251 sbi->s_def_hash_version = es->s_def_hash_version;
Theodore Ts'of99b2582008-10-28 13:21:44 -04002252 i = le32_to_cpu(es->s_flags);
2253 if (i & EXT2_FLAGS_UNSIGNED_HASH)
2254 sbi->s_hash_unsigned = 3;
2255 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
2256#ifdef __CHAR_UNSIGNED__
2257 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
2258 sbi->s_hash_unsigned = 3;
2259#else
2260 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
2261#endif
2262 sb->s_dirt = 1;
2263 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002264
2265 if (sbi->s_blocks_per_group > blocksize * 8) {
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002266 printk(KERN_ERR
2267 "EXT4-fs: #blocks per group too big: %lu\n",
2268 sbi->s_blocks_per_group);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002269 goto failed_mount;
2270 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002271 if (sbi->s_inodes_per_group > blocksize * 8) {
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002272 printk(KERN_ERR
2273 "EXT4-fs: #inodes per group too big: %lu\n",
2274 sbi->s_inodes_per_group);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002275 goto failed_mount;
2276 }
2277
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002278 if (ext4_blocks_count(es) >
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002279 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
Mingming Cao617ba132006-10-11 01:20:53 -07002280 printk(KERN_ERR "EXT4-fs: filesystem on %s:"
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002281 " too large to mount safely\n", sb->s_id);
2282 if (sizeof(sector_t) < 8)
Mingming Cao617ba132006-10-11 01:20:53 -07002283 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002284 "enabled\n");
2285 goto failed_mount;
2286 }
2287
Mingming Cao617ba132006-10-11 01:20:53 -07002288 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
2289 goto cantfind_ext4;
Eric Sandeene7c95592008-01-28 23:58:27 -05002290
Theodore Ts'o4ec11022009-01-06 14:53:26 -05002291 /*
2292 * It makes no sense for the first data block to be beyond the end
2293 * of the filesystem.
2294 */
2295 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
2296 printk(KERN_WARNING "EXT4-fs: bad geometry: first data"
2297 "block %u is beyond end of filesystem (%llu)\n",
2298 le32_to_cpu(es->s_first_data_block),
2299 ext4_blocks_count(es));
Eric Sandeene7c95592008-01-28 23:58:27 -05002300 goto failed_mount;
2301 }
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002302 blocks_count = (ext4_blocks_count(es) -
2303 le32_to_cpu(es->s_first_data_block) +
2304 EXT4_BLOCKS_PER_GROUP(sb) - 1);
2305 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
Theodore Ts'o4ec11022009-01-06 14:53:26 -05002306 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
2307 printk(KERN_WARNING "EXT4-fs: groups count too large: %u "
2308 "(block count %llu, first data block %u, "
2309 "blocks per group %lu)\n", sbi->s_groups_count,
2310 ext4_blocks_count(es),
2311 le32_to_cpu(es->s_first_data_block),
2312 EXT4_BLOCKS_PER_GROUP(sb));
2313 goto failed_mount;
2314 }
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002315 sbi->s_groups_count = blocks_count;
Mingming Cao617ba132006-10-11 01:20:53 -07002316 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
2317 EXT4_DESC_PER_BLOCK(sb);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002318 sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *),
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002319 GFP_KERNEL);
2320 if (sbi->s_group_desc == NULL) {
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002321 printk(KERN_ERR "EXT4-fs: not enough memory\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002322 goto failed_mount;
2323 }
2324
Alexander Beregalov3244fcb2008-10-12 17:27:49 -04002325#ifdef CONFIG_PROC_FS
Theodore Ts'o9f6200b2008-09-23 09:18:24 -04002326 if (ext4_proc_root)
2327 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
2328
Theodore Ts'o240799c2008-10-09 23:53:47 -04002329 if (sbi->s_proc)
2330 proc_create_data("inode_readahead_blks", 0644, sbi->s_proc,
2331 &ext4_ui_proc_fops,
2332 &sbi->s_inode_readahead_blks);
Alexander Beregalov3244fcb2008-10-12 17:27:49 -04002333#endif
Theodore Ts'o240799c2008-10-09 23:53:47 -04002334
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002335 bgl_lock_init(&sbi->s_blockgroup_lock);
2336
2337 for (i = 0; i < db_count; i++) {
Andrew Morton70bbb3e2006-10-11 01:21:20 -07002338 block = descriptor_loc(sb, logical_sb_block, i);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002339 sbi->s_group_desc[i] = sb_bread(sb, block);
2340 if (!sbi->s_group_desc[i]) {
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002341 printk(KERN_ERR "EXT4-fs: "
2342 "can't read group descriptor %d\n", i);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002343 db_count = i;
2344 goto failed_mount2;
2345 }
2346 }
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002347 if (!ext4_check_descriptors(sb)) {
Mingming Cao617ba132006-10-11 01:20:53 -07002348 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002349 goto failed_mount2;
2350 }
Jose R. Santos772cb7c2008-07-11 19:27:31 -04002351 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2352 if (!ext4_fill_flex_info(sb)) {
2353 printk(KERN_ERR
2354 "EXT4-fs: unable to initialize "
2355 "flex_bg meta info!\n");
2356 goto failed_mount2;
2357 }
2358
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002359 sbi->s_gdb_count = db_count;
2360 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
2361 spin_lock_init(&sbi->s_next_gen_lock);
2362
Peter Zijlstra833f4072007-10-16 23:25:45 -07002363 err = percpu_counter_init(&sbi->s_freeblocks_counter,
2364 ext4_count_free_blocks(sb));
2365 if (!err) {
2366 err = percpu_counter_init(&sbi->s_freeinodes_counter,
2367 ext4_count_free_inodes(sb));
2368 }
2369 if (!err) {
2370 err = percpu_counter_init(&sbi->s_dirs_counter,
2371 ext4_count_dirs(sb));
2372 }
Aneesh Kumar K.V6bc6e632008-10-10 09:39:00 -04002373 if (!err) {
2374 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
2375 }
Peter Zijlstra833f4072007-10-16 23:25:45 -07002376 if (err) {
2377 printk(KERN_ERR "EXT4-fs: insufficient memory\n");
2378 goto failed_mount3;
2379 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002380
Alex Tomasc9de5602008-01-29 00:19:52 -05002381 sbi->s_stripe = ext4_get_stripe_size(sbi);
2382
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002383 /*
2384 * set up enough so that it can read an inode
2385 */
Mingming Cao617ba132006-10-11 01:20:53 -07002386 sb->s_op = &ext4_sops;
2387 sb->s_export_op = &ext4_export_ops;
2388 sb->s_xattr = ext4_xattr_handlers;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002389#ifdef CONFIG_QUOTA
Mingming Cao617ba132006-10-11 01:20:53 -07002390 sb->s_qcop = &ext4_qctl_operations;
2391 sb->dq_op = &ext4_quota_operations;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002392#endif
2393 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
2394
2395 sb->s_root = NULL;
2396
2397 needs_recovery = (es->s_last_orphan != 0 ||
Mingming Cao617ba132006-10-11 01:20:53 -07002398 EXT4_HAS_INCOMPAT_FEATURE(sb,
2399 EXT4_FEATURE_INCOMPAT_RECOVER));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002400
2401 /*
2402 * The first inode we look at is the journal inode. Don't try
2403 * root first: it may be modified in the journal!
2404 */
2405 if (!test_opt(sb, NOLOAD) &&
Mingming Cao617ba132006-10-11 01:20:53 -07002406 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
2407 if (ext4_load_journal(sb, es, journal_devnum))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002408 goto failed_mount3;
Theodore Ts'o624080e2008-06-06 17:50:40 -04002409 if (!(sb->s_flags & MS_RDONLY) &&
2410 EXT4_SB(sb)->s_journal->j_failed_commit) {
2411 printk(KERN_CRIT "EXT4-fs error (device %s): "
2412 "ext4_fill_super: Journal transaction "
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002413 "%u is corrupt\n", sb->s_id,
Theodore Ts'o624080e2008-06-06 17:50:40 -04002414 EXT4_SB(sb)->s_journal->j_failed_commit);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002415 if (test_opt(sb, ERRORS_RO)) {
2416 printk(KERN_CRIT
2417 "Mounting filesystem read-only\n");
Theodore Ts'o624080e2008-06-06 17:50:40 -04002418 sb->s_flags |= MS_RDONLY;
2419 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2420 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2421 }
2422 if (test_opt(sb, ERRORS_PANIC)) {
2423 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2424 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2425 ext4_commit_super(sb, es, 1);
Theodore Ts'o624080e2008-06-06 17:50:40 -04002426 goto failed_mount4;
2427 }
2428 }
Frank Mayhar03901312009-01-07 00:06:22 -05002429 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
2430 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
2431 printk(KERN_ERR "EXT4-fs: required journal recovery "
2432 "suppressed and not mounted read-only\n");
2433 goto failed_mount4;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002434 } else {
Frank Mayhar03901312009-01-07 00:06:22 -05002435 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
2436 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
2437 sbi->s_journal = NULL;
2438 needs_recovery = 0;
2439 goto no_journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002440 }
2441
Jose R. Santoseb40a092007-07-18 08:37:25 -04002442 if (ext4_blocks_count(es) > 0xffffffffULL &&
2443 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
2444 JBD2_FEATURE_INCOMPAT_64BIT)) {
Theodore Ts'oabda1412009-01-06 00:20:32 -05002445 printk(KERN_ERR "EXT4-fs: Failed to set 64-bit journal feature\n");
Jose R. Santoseb40a092007-07-18 08:37:25 -04002446 goto failed_mount4;
2447 }
2448
Girish Shilamkar818d2762008-01-28 23:58:27 -05002449 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2450 jbd2_journal_set_features(sbi->s_journal,
2451 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2452 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2453 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2454 jbd2_journal_set_features(sbi->s_journal,
2455 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
2456 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2457 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2458 } else {
2459 jbd2_journal_clear_features(sbi->s_journal,
2460 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2461 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2462 }
2463
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002464 /* We have now updated the journal if required, so we can
2465 * validate the data journaling mode. */
2466 switch (test_opt(sb, DATA_FLAGS)) {
2467 case 0:
2468 /* No mode set, assume a default based on the journal
Andrew Morton63f57932006-10-11 01:21:24 -07002469 * capabilities: ORDERED_DATA if the journal can
2470 * cope, else JOURNAL_DATA
2471 */
Mingming Caodab291a2006-10-11 01:21:01 -07002472 if (jbd2_journal_check_available_features
2473 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002474 set_opt(sbi->s_mount_opt, ORDERED_DATA);
2475 else
2476 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2477 break;
2478
Mingming Cao617ba132006-10-11 01:20:53 -07002479 case EXT4_MOUNT_ORDERED_DATA:
2480 case EXT4_MOUNT_WRITEBACK_DATA:
Mingming Caodab291a2006-10-11 01:21:01 -07002481 if (!jbd2_journal_check_available_features
2482 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
Mingming Cao617ba132006-10-11 01:20:53 -07002483 printk(KERN_ERR "EXT4-fs: Journal does not support "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002484 "requested data journaling mode\n");
2485 goto failed_mount4;
2486 }
2487 default:
2488 break;
2489 }
Theodore Ts'ob3881f72009-01-05 22:46:26 -05002490 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002491
Frank Mayhar03901312009-01-07 00:06:22 -05002492no_journal:
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002493
2494 if (test_opt(sb, NOBH)) {
Mingming Cao617ba132006-10-11 01:20:53 -07002495 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
2496 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002497 "its supported only with writeback mode\n");
2498 clear_opt(sbi->s_mount_opt, NOBH);
2499 }
2500 }
2501 /*
Mingming Caodab291a2006-10-11 01:21:01 -07002502 * The jbd2_journal_load will have done any necessary log recovery,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002503 * so we can safely mount the rest of the filesystem now.
2504 */
2505
David Howells1d1fe1e2008-02-07 00:15:37 -08002506 root = ext4_iget(sb, EXT4_ROOT_INO);
2507 if (IS_ERR(root)) {
Mingming Cao617ba132006-10-11 01:20:53 -07002508 printk(KERN_ERR "EXT4-fs: get root inode failed\n");
David Howells1d1fe1e2008-02-07 00:15:37 -08002509 ret = PTR_ERR(root);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002510 goto failed_mount4;
2511 }
2512 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
David Howells1d1fe1e2008-02-07 00:15:37 -08002513 iput(root);
Mingming Cao617ba132006-10-11 01:20:53 -07002514 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002515 goto failed_mount4;
2516 }
David Howells1d1fe1e2008-02-07 00:15:37 -08002517 sb->s_root = d_alloc_root(root);
2518 if (!sb->s_root) {
2519 printk(KERN_ERR "EXT4-fs: get root dentry failed\n");
2520 iput(root);
2521 ret = -ENOMEM;
2522 goto failed_mount4;
2523 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002524
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002525 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
Kalpak Shahef7f3832007-07-18 09:15:20 -04002526
2527 /* determine the minimum size of new large inodes, if present */
2528 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
2529 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2530 EXT4_GOOD_OLD_INODE_SIZE;
2531 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2532 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2533 if (sbi->s_want_extra_isize <
2534 le16_to_cpu(es->s_want_extra_isize))
2535 sbi->s_want_extra_isize =
2536 le16_to_cpu(es->s_want_extra_isize);
2537 if (sbi->s_want_extra_isize <
2538 le16_to_cpu(es->s_min_extra_isize))
2539 sbi->s_want_extra_isize =
2540 le16_to_cpu(es->s_min_extra_isize);
2541 }
2542 }
2543 /* Check if enough inode space is available */
2544 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2545 sbi->s_inode_size) {
2546 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2547 EXT4_GOOD_OLD_INODE_SIZE;
2548 printk(KERN_INFO "EXT4-fs: required extra inode space not"
2549 "available.\n");
2550 }
2551
Aneesh Kumar K.Vc2774d82008-10-10 20:07:20 -04002552 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
2553 printk(KERN_WARNING "EXT4-fs: Ignoring delalloc option - "
2554 "requested data journaling mode\n");
2555 clear_opt(sbi->s_mount_opt, DELALLOC);
2556 } else if (test_opt(sb, DELALLOC))
2557 printk(KERN_INFO "EXT4-fs: delayed allocation enabled\n");
2558
2559 ext4_ext_init(sb);
2560 err = ext4_mb_init(sb, needs_recovery);
2561 if (err) {
2562 printk(KERN_ERR "EXT4-fs: failed to initalize mballoc (%d)\n",
2563 err);
2564 goto failed_mount4;
2565 }
2566
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002567 /*
2568 * akpm: core read_super() calls in here with the superblock locked.
2569 * That deadlocks, because orphan cleanup needs to lock the superblock
2570 * in numerous places. Here we just pop the lock - it's relatively
2571 * harmless, because we are now ready to accept write_super() requests,
2572 * and aviro says that's the only reason for hanging onto the
2573 * superblock lock.
2574 */
Mingming Cao617ba132006-10-11 01:20:53 -07002575 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
2576 ext4_orphan_cleanup(sb, es);
2577 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
Frank Mayhar03901312009-01-07 00:06:22 -05002578 if (needs_recovery) {
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002579 printk(KERN_INFO "EXT4-fs: recovery complete.\n");
Frank Mayhar03901312009-01-07 00:06:22 -05002580 ext4_mark_recovery_complete(sb, es);
2581 }
2582 if (EXT4_SB(sb)->s_journal) {
2583 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
2584 descr = " journalled data mode";
2585 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
2586 descr = " ordered data mode";
2587 else
2588 descr = " writeback data mode";
2589 } else
2590 descr = "out journal";
2591
2592 printk(KERN_INFO "EXT4-fs: mounted filesystem %s with%s\n",
2593 sb->s_id, descr);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002594
2595 lock_kernel();
2596 return 0;
2597
Mingming Cao617ba132006-10-11 01:20:53 -07002598cantfind_ext4:
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002599 if (!silent)
Mingming Cao617ba132006-10-11 01:20:53 -07002600 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002601 sb->s_id);
2602 goto failed_mount;
2603
2604failed_mount4:
Frank Mayhar03901312009-01-07 00:06:22 -05002605 printk(KERN_ERR "EXT4-fs (device %s): mount failed\n", sb->s_id);
2606 if (sbi->s_journal) {
2607 jbd2_journal_destroy(sbi->s_journal);
2608 sbi->s_journal = NULL;
2609 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002610failed_mount3:
2611 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2612 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2613 percpu_counter_destroy(&sbi->s_dirs_counter);
Aneesh Kumar K.V6bc6e632008-10-10 09:39:00 -04002614 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002615failed_mount2:
2616 for (i = 0; i < db_count; i++)
2617 brelse(sbi->s_group_desc[i]);
2618 kfree(sbi->s_group_desc);
2619failed_mount:
Theodore Ts'o240799c2008-10-09 23:53:47 -04002620 if (sbi->s_proc) {
2621 remove_proc_entry("inode_readahead_blks", sbi->s_proc);
Theodore Ts'o9f6200b2008-09-23 09:18:24 -04002622 remove_proc_entry(sb->s_id, ext4_proc_root);
Theodore Ts'o240799c2008-10-09 23:53:47 -04002623 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002624#ifdef CONFIG_QUOTA
2625 for (i = 0; i < MAXQUOTAS; i++)
2626 kfree(sbi->s_qf_names[i]);
2627#endif
Mingming Cao617ba132006-10-11 01:20:53 -07002628 ext4_blkdev_remove(sbi);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002629 brelse(bh);
2630out_fail:
2631 sb->s_fs_info = NULL;
2632 kfree(sbi);
2633 lock_kernel();
David Howells1d1fe1e2008-02-07 00:15:37 -08002634 return ret;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002635}
2636
2637/*
2638 * Setup any per-fs journal parameters now. We'll do this both on
2639 * initial mount, once the journal has been initialised but before we've
2640 * done any recovery; and again on any subsequent remount.
2641 */
Mingming Cao617ba132006-10-11 01:20:53 -07002642static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002643{
Mingming Cao617ba132006-10-11 01:20:53 -07002644 struct ext4_sb_info *sbi = EXT4_SB(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002645
Theodore Ts'o30773842009-01-03 20:27:38 -05002646 journal->j_commit_interval = sbi->s_commit_interval;
2647 journal->j_min_batch_time = sbi->s_min_batch_time;
2648 journal->j_max_batch_time = sbi->s_max_batch_time;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002649
2650 spin_lock(&journal->j_state_lock);
2651 if (test_opt(sb, BARRIER))
Mingming Caodab291a2006-10-11 01:21:01 -07002652 journal->j_flags |= JBD2_BARRIER;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002653 else
Mingming Caodab291a2006-10-11 01:21:01 -07002654 journal->j_flags &= ~JBD2_BARRIER;
Hidehiro Kawai5bf56832008-10-10 22:12:43 -04002655 if (test_opt(sb, DATA_ERR_ABORT))
2656 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
2657 else
2658 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002659 spin_unlock(&journal->j_state_lock);
2660}
2661
Mingming Cao617ba132006-10-11 01:20:53 -07002662static journal_t *ext4_get_journal(struct super_block *sb,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002663 unsigned int journal_inum)
2664{
2665 struct inode *journal_inode;
2666 journal_t *journal;
2667
Frank Mayhar03901312009-01-07 00:06:22 -05002668 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
2669
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002670 /* First, test for the existence of a valid inode on disk. Bad
2671 * things happen if we iget() an unused inode, as the subsequent
2672 * iput() will try to delete it. */
2673
David Howells1d1fe1e2008-02-07 00:15:37 -08002674 journal_inode = ext4_iget(sb, journal_inum);
2675 if (IS_ERR(journal_inode)) {
Mingming Cao617ba132006-10-11 01:20:53 -07002676 printk(KERN_ERR "EXT4-fs: no journal found.\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002677 return NULL;
2678 }
2679 if (!journal_inode->i_nlink) {
2680 make_bad_inode(journal_inode);
2681 iput(journal_inode);
Mingming Cao617ba132006-10-11 01:20:53 -07002682 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002683 return NULL;
2684 }
2685
Theodore Ts'oe5f8eab82008-09-08 22:25:04 -04002686 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002687 journal_inode, journal_inode->i_size);
David Howells1d1fe1e2008-02-07 00:15:37 -08002688 if (!S_ISREG(journal_inode->i_mode)) {
Mingming Cao617ba132006-10-11 01:20:53 -07002689 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002690 iput(journal_inode);
2691 return NULL;
2692 }
2693
Mingming Caodab291a2006-10-11 01:21:01 -07002694 journal = jbd2_journal_init_inode(journal_inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002695 if (!journal) {
Mingming Cao617ba132006-10-11 01:20:53 -07002696 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002697 iput(journal_inode);
2698 return NULL;
2699 }
2700 journal->j_private = sb;
Mingming Cao617ba132006-10-11 01:20:53 -07002701 ext4_init_journal_params(sb, journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002702 return journal;
2703}
2704
Mingming Cao617ba132006-10-11 01:20:53 -07002705static journal_t *ext4_get_dev_journal(struct super_block *sb,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002706 dev_t j_dev)
2707{
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002708 struct buffer_head *bh;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002709 journal_t *journal;
Mingming Cao617ba132006-10-11 01:20:53 -07002710 ext4_fsblk_t start;
2711 ext4_fsblk_t len;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002712 int hblock, blocksize;
Mingming Cao617ba132006-10-11 01:20:53 -07002713 ext4_fsblk_t sb_block;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002714 unsigned long offset;
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002715 struct ext4_super_block *es;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002716 struct block_device *bdev;
2717
Frank Mayhar03901312009-01-07 00:06:22 -05002718 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
2719
Mingming Cao617ba132006-10-11 01:20:53 -07002720 bdev = ext4_blkdev_get(j_dev);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002721 if (bdev == NULL)
2722 return NULL;
2723
2724 if (bd_claim(bdev, sb)) {
2725 printk(KERN_ERR
Theodore Ts'oabda1412009-01-06 00:20:32 -05002726 "EXT4-fs: failed to claim external journal device.\n");
Al Viro9a1c3542008-02-22 20:40:24 -05002727 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002728 return NULL;
2729 }
2730
2731 blocksize = sb->s_blocksize;
2732 hblock = bdev_hardsect_size(bdev);
2733 if (blocksize < hblock) {
2734 printk(KERN_ERR
Mingming Cao617ba132006-10-11 01:20:53 -07002735 "EXT4-fs: blocksize too small for journal device.\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002736 goto out_bdev;
2737 }
2738
Mingming Cao617ba132006-10-11 01:20:53 -07002739 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
2740 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002741 set_blocksize(bdev, blocksize);
2742 if (!(bh = __bread(bdev, sb_block, blocksize))) {
Mingming Cao617ba132006-10-11 01:20:53 -07002743 printk(KERN_ERR "EXT4-fs: couldn't read superblock of "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002744 "external journal\n");
2745 goto out_bdev;
2746 }
2747
Mingming Cao617ba132006-10-11 01:20:53 -07002748 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2749 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002750 !(le32_to_cpu(es->s_feature_incompat) &
Mingming Cao617ba132006-10-11 01:20:53 -07002751 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2752 printk(KERN_ERR "EXT4-fs: external journal has "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002753 "bad superblock\n");
2754 brelse(bh);
2755 goto out_bdev;
2756 }
2757
Mingming Cao617ba132006-10-11 01:20:53 -07002758 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2759 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002760 brelse(bh);
2761 goto out_bdev;
2762 }
2763
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07002764 len = ext4_blocks_count(es);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002765 start = sb_block + 1;
2766 brelse(bh); /* we're done with the superblock */
2767
Mingming Caodab291a2006-10-11 01:21:01 -07002768 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002769 start, len, blocksize);
2770 if (!journal) {
Mingming Cao617ba132006-10-11 01:20:53 -07002771 printk(KERN_ERR "EXT4-fs: failed to create device journal\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002772 goto out_bdev;
2773 }
2774 journal->j_private = sb;
2775 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2776 wait_on_buffer(journal->j_sb_buffer);
2777 if (!buffer_uptodate(journal->j_sb_buffer)) {
Mingming Cao617ba132006-10-11 01:20:53 -07002778 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002779 goto out_journal;
2780 }
2781 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
Mingming Cao617ba132006-10-11 01:20:53 -07002782 printk(KERN_ERR "EXT4-fs: External journal has more than one "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002783 "user (unsupported) - %d\n",
2784 be32_to_cpu(journal->j_superblock->s_nr_users));
2785 goto out_journal;
2786 }
Mingming Cao617ba132006-10-11 01:20:53 -07002787 EXT4_SB(sb)->journal_bdev = bdev;
2788 ext4_init_journal_params(sb, journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002789 return journal;
2790out_journal:
Mingming Caodab291a2006-10-11 01:21:01 -07002791 jbd2_journal_destroy(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002792out_bdev:
Mingming Cao617ba132006-10-11 01:20:53 -07002793 ext4_blkdev_put(bdev);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002794 return NULL;
2795}
2796
Mingming Cao617ba132006-10-11 01:20:53 -07002797static int ext4_load_journal(struct super_block *sb,
2798 struct ext4_super_block *es,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002799 unsigned long journal_devnum)
2800{
2801 journal_t *journal;
2802 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2803 dev_t journal_dev;
2804 int err = 0;
2805 int really_read_only;
2806
Frank Mayhar03901312009-01-07 00:06:22 -05002807 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
2808
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002809 if (journal_devnum &&
2810 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
Mingming Cao617ba132006-10-11 01:20:53 -07002811 printk(KERN_INFO "EXT4-fs: external journal device major/minor "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002812 "numbers have changed\n");
2813 journal_dev = new_decode_dev(journal_devnum);
2814 } else
2815 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2816
2817 really_read_only = bdev_read_only(sb->s_bdev);
2818
2819 /*
2820 * Are we loading a blank journal or performing recovery after a
2821 * crash? For recovery, we need to check in advance whether we
2822 * can get read-write access to the device.
2823 */
2824
Mingming Cao617ba132006-10-11 01:20:53 -07002825 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002826 if (sb->s_flags & MS_RDONLY) {
Mingming Cao617ba132006-10-11 01:20:53 -07002827 printk(KERN_INFO "EXT4-fs: INFO: recovery "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002828 "required on readonly filesystem.\n");
2829 if (really_read_only) {
Mingming Cao617ba132006-10-11 01:20:53 -07002830 printk(KERN_ERR "EXT4-fs: write access "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002831 "unavailable, cannot proceed.\n");
2832 return -EROFS;
2833 }
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002834 printk(KERN_INFO "EXT4-fs: write access will "
2835 "be enabled during recovery.\n");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002836 }
2837 }
2838
2839 if (journal_inum && journal_dev) {
Mingming Cao617ba132006-10-11 01:20:53 -07002840 printk(KERN_ERR "EXT4-fs: filesystem has both journal "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002841 "and inode journals!\n");
2842 return -EINVAL;
2843 }
2844
2845 if (journal_inum) {
Mingming Cao617ba132006-10-11 01:20:53 -07002846 if (!(journal = ext4_get_journal(sb, journal_inum)))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002847 return -EINVAL;
2848 } else {
Mingming Cao617ba132006-10-11 01:20:53 -07002849 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002850 return -EINVAL;
2851 }
2852
Theodore Ts'o4776004f2008-09-08 23:00:52 -04002853 if (journal->j_flags & JBD2_BARRIER)
2854 printk(KERN_INFO "EXT4-fs: barriers enabled\n");
2855 else
2856 printk(KERN_INFO "EXT4-fs: barriers disabled\n");
2857
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002858 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
Mingming Caodab291a2006-10-11 01:21:01 -07002859 err = jbd2_journal_update_format(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002860 if (err) {
Mingming Cao617ba132006-10-11 01:20:53 -07002861 printk(KERN_ERR "EXT4-fs: error updating journal.\n");
Mingming Caodab291a2006-10-11 01:21:01 -07002862 jbd2_journal_destroy(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002863 return err;
2864 }
2865 }
2866
Mingming Cao617ba132006-10-11 01:20:53 -07002867 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
Mingming Caodab291a2006-10-11 01:21:01 -07002868 err = jbd2_journal_wipe(journal, !really_read_only);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002869 if (!err)
Mingming Caodab291a2006-10-11 01:21:01 -07002870 err = jbd2_journal_load(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002871
2872 if (err) {
Mingming Cao617ba132006-10-11 01:20:53 -07002873 printk(KERN_ERR "EXT4-fs: error loading journal.\n");
Mingming Caodab291a2006-10-11 01:21:01 -07002874 jbd2_journal_destroy(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002875 return err;
2876 }
2877
Mingming Cao617ba132006-10-11 01:20:53 -07002878 EXT4_SB(sb)->s_journal = journal;
2879 ext4_clear_journal_err(sb, es);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002880
2881 if (journal_devnum &&
2882 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2883 es->s_journal_dev = cpu_to_le32(journal_devnum);
2884 sb->s_dirt = 1;
2885
2886 /* Make sure we flush the recovery flag to disk. */
Mingming Cao617ba132006-10-11 01:20:53 -07002887 ext4_commit_super(sb, es, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002888 }
2889
2890 return 0;
2891}
2892
Takashi Satoc4be0c12009-01-09 16:40:58 -08002893static int ext4_commit_super(struct super_block *sb,
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002894 struct ext4_super_block *es, int sync)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002895{
Mingming Cao617ba132006-10-11 01:20:53 -07002896 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
Takashi Satoc4be0c12009-01-09 16:40:58 -08002897 int error = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002898
2899 if (!sbh)
Takashi Satoc4be0c12009-01-09 16:40:58 -08002900 return error;
Theodore Ts'o914258b2008-10-06 21:35:40 -04002901 if (buffer_write_io_error(sbh)) {
2902 /*
2903 * Oh, dear. A previous attempt to write the
2904 * superblock failed. This could happen because the
2905 * USB device was yanked out. Or it could happen to
2906 * be a transient write error and maybe the block will
2907 * be remapped. Nothing we can do but to retry the
2908 * write and hope for the best.
2909 */
Theodore Ts'oabda1412009-01-06 00:20:32 -05002910 printk(KERN_ERR "EXT4-fs: previous I/O error to "
Theodore Ts'o914258b2008-10-06 21:35:40 -04002911 "superblock detected for %s.\n", sb->s_id);
2912 clear_buffer_write_io_error(sbh);
2913 set_buffer_uptodate(sbh);
2914 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002915 es->s_wtime = cpu_to_le32(get_seconds());
Aneesh Kumar K.V5d1b1b32009-01-05 22:19:52 -05002916 ext4_free_blocks_count_set(es, percpu_counter_sum_positive(
2917 &EXT4_SB(sb)->s_freeblocks_counter));
2918 es->s_free_inodes_count = cpu_to_le32(percpu_counter_sum_positive(
2919 &EXT4_SB(sb)->s_freeinodes_counter));
2920
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002921 BUFFER_TRACE(sbh, "marking dirty");
2922 mark_buffer_dirty(sbh);
Theodore Ts'o914258b2008-10-06 21:35:40 -04002923 if (sync) {
Takashi Satoc4be0c12009-01-09 16:40:58 -08002924 error = sync_dirty_buffer(sbh);
2925 if (error)
2926 return error;
2927
2928 error = buffer_write_io_error(sbh);
2929 if (error) {
Theodore Ts'oabda1412009-01-06 00:20:32 -05002930 printk(KERN_ERR "EXT4-fs: I/O error while writing "
Theodore Ts'o914258b2008-10-06 21:35:40 -04002931 "superblock for %s.\n", sb->s_id);
2932 clear_buffer_write_io_error(sbh);
2933 set_buffer_uptodate(sbh);
2934 }
2935 }
Takashi Satoc4be0c12009-01-09 16:40:58 -08002936 return error;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002937}
2938
2939
2940/*
2941 * Have we just finished recovery? If so, and if we are mounting (or
2942 * remounting) the filesystem readonly, then we will end up with a
2943 * consistent fs on disk. Record that fact.
2944 */
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002945static void ext4_mark_recovery_complete(struct super_block *sb,
2946 struct ext4_super_block *es)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002947{
Mingming Cao617ba132006-10-11 01:20:53 -07002948 journal_t *journal = EXT4_SB(sb)->s_journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002949
Frank Mayhar03901312009-01-07 00:06:22 -05002950 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
2951 BUG_ON(journal != NULL);
2952 return;
2953 }
Mingming Caodab291a2006-10-11 01:21:01 -07002954 jbd2_journal_lock_updates(journal);
Hidehiro Kawai7ffe1ea2008-10-10 20:29:21 -04002955 if (jbd2_journal_flush(journal) < 0)
2956 goto out;
2957
Jan Kara32c37732007-07-15 23:41:09 -07002958 lock_super(sb);
Mingming Cao617ba132006-10-11 01:20:53 -07002959 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002960 sb->s_flags & MS_RDONLY) {
Mingming Cao617ba132006-10-11 01:20:53 -07002961 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002962 sb->s_dirt = 0;
Mingming Cao617ba132006-10-11 01:20:53 -07002963 ext4_commit_super(sb, es, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002964 }
Jan Kara32c37732007-07-15 23:41:09 -07002965 unlock_super(sb);
Hidehiro Kawai7ffe1ea2008-10-10 20:29:21 -04002966
2967out:
Mingming Caodab291a2006-10-11 01:21:01 -07002968 jbd2_journal_unlock_updates(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002969}
2970
2971/*
2972 * If we are mounting (or read-write remounting) a filesystem whose journal
2973 * has recorded an error from a previous lifetime, move that error to the
2974 * main filesystem now.
2975 */
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04002976static void ext4_clear_journal_err(struct super_block *sb,
2977 struct ext4_super_block *es)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002978{
2979 journal_t *journal;
2980 int j_errno;
2981 const char *errstr;
2982
Frank Mayhar03901312009-01-07 00:06:22 -05002983 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
2984
Mingming Cao617ba132006-10-11 01:20:53 -07002985 journal = EXT4_SB(sb)->s_journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002986
2987 /*
2988 * Now check for any error status which may have been recorded in the
Mingming Cao617ba132006-10-11 01:20:53 -07002989 * journal by a prior ext4_error() or ext4_abort()
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002990 */
2991
Mingming Caodab291a2006-10-11 01:21:01 -07002992 j_errno = jbd2_journal_errno(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002993 if (j_errno) {
2994 char nbuf[16];
2995
Mingming Cao617ba132006-10-11 01:20:53 -07002996 errstr = ext4_decode_error(sb, j_errno, nbuf);
Harvey Harrison46e665e2008-04-17 10:38:59 -04002997 ext4_warning(sb, __func__, "Filesystem error recorded "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07002998 "from previous mount: %s", errstr);
Harvey Harrison46e665e2008-04-17 10:38:59 -04002999 ext4_warning(sb, __func__, "Marking fs in need of "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003000 "filesystem check.");
3001
Mingming Cao617ba132006-10-11 01:20:53 -07003002 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
3003 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04003004 ext4_commit_super(sb, es, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003005
Mingming Caodab291a2006-10-11 01:21:01 -07003006 jbd2_journal_clear_err(journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003007 }
3008}
3009
3010/*
3011 * Force the running and committing transactions to commit,
3012 * and wait on the commit.
3013 */
Mingming Cao617ba132006-10-11 01:20:53 -07003014int ext4_force_commit(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003015{
3016 journal_t *journal;
Frank Mayhar03901312009-01-07 00:06:22 -05003017 int ret = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003018
3019 if (sb->s_flags & MS_RDONLY)
3020 return 0;
3021
Mingming Cao617ba132006-10-11 01:20:53 -07003022 journal = EXT4_SB(sb)->s_journal;
Frank Mayhar03901312009-01-07 00:06:22 -05003023 if (journal) {
3024 sb->s_dirt = 0;
3025 ret = ext4_journal_force_commit(journal);
3026 }
3027
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003028 return ret;
3029}
3030
3031/*
Mingming Cao617ba132006-10-11 01:20:53 -07003032 * Ext4 always journals updates to the superblock itself, so we don't
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003033 * have to propagate any other updates to the superblock on disk at this
Theodore Ts'o14ce0cb2008-11-03 18:10:55 -05003034 * point. (We can probably nuke this function altogether, and remove
3035 * any mention to sb->s_dirt in all of fs/ext4; eventual cleanup...)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003036 */
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04003037static void ext4_write_super(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003038{
Frank Mayhar03901312009-01-07 00:06:22 -05003039 if (EXT4_SB(sb)->s_journal) {
3040 if (mutex_trylock(&sb->s_lock) != 0)
3041 BUG();
3042 sb->s_dirt = 0;
3043 } else {
3044 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
3045 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003046}
3047
Mingming Cao617ba132006-10-11 01:20:53 -07003048static int ext4_sync_fs(struct super_block *sb, int wait)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003049{
Theodore Ts'o14ce0cb2008-11-03 18:10:55 -05003050 int ret = 0;
Jan Kara9eddacf2009-02-10 06:46:05 -05003051 tid_t target;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003052
Theodore Ts'oede86cc2008-10-05 20:50:06 -04003053 trace_mark(ext4_sync_fs, "dev %s wait %d", sb->s_id, wait);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003054 sb->s_dirt = 0;
Frank Mayhar03901312009-01-07 00:06:22 -05003055 if (EXT4_SB(sb)->s_journal) {
Jan Kara9eddacf2009-02-10 06:46:05 -05003056 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal,
3057 &target)) {
3058 if (wait)
3059 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal,
3060 target);
3061 }
Frank Mayhar03901312009-01-07 00:06:22 -05003062 } else {
3063 ext4_commit_super(sb, EXT4_SB(sb)->s_es, wait);
3064 }
Theodore Ts'o14ce0cb2008-11-03 18:10:55 -05003065 return ret;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003066}
3067
3068/*
3069 * LVM calls this function before a (read-only) snapshot is created. This
3070 * gives us a chance to flush the journal completely and mark the fs clean.
3071 */
Takashi Satoc4be0c12009-01-09 16:40:58 -08003072static int ext4_freeze(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003073{
Takashi Satoc4be0c12009-01-09 16:40:58 -08003074 int error = 0;
3075 journal_t *journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003076 sb->s_dirt = 0;
3077
3078 if (!(sb->s_flags & MS_RDONLY)) {
Takashi Satoc4be0c12009-01-09 16:40:58 -08003079 journal = EXT4_SB(sb)->s_journal;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003080
Frank Mayhar03901312009-01-07 00:06:22 -05003081 if (journal) {
3082 /* Now we set up the journal barrier. */
3083 jbd2_journal_lock_updates(journal);
Hidehiro Kawai7ffe1ea2008-10-10 20:29:21 -04003084
Frank Mayhar03901312009-01-07 00:06:22 -05003085 /*
3086 * We don't want to clear needs_recovery flag when we
3087 * failed to flush the journal.
3088 */
Takashi Satoc4be0c12009-01-09 16:40:58 -08003089 error = jbd2_journal_flush(journal);
3090 if (error < 0)
3091 goto out;
Frank Mayhar03901312009-01-07 00:06:22 -05003092 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003093
3094 /* Journal blocked and flushed, clear needs_recovery flag. */
Mingming Cao617ba132006-10-11 01:20:53 -07003095 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
Takashi Satoc4be0c12009-01-09 16:40:58 -08003096 error = ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
3097 if (error)
3098 goto out;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003099 }
Takashi Satoc4be0c12009-01-09 16:40:58 -08003100 return 0;
3101out:
3102 jbd2_journal_unlock_updates(journal);
3103 return error;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003104}
3105
3106/*
3107 * Called by LVM after the snapshot is done. We need to reset the RECOVER
3108 * flag here, even though the filesystem is not technically dirty yet.
3109 */
Takashi Satoc4be0c12009-01-09 16:40:58 -08003110static int ext4_unfreeze(struct super_block *sb)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003111{
Frank Mayhar03901312009-01-07 00:06:22 -05003112 if (EXT4_SB(sb)->s_journal && !(sb->s_flags & MS_RDONLY)) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003113 lock_super(sb);
3114 /* Reser the needs_recovery flag before the fs is unlocked. */
Mingming Cao617ba132006-10-11 01:20:53 -07003115 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3116 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003117 unlock_super(sb);
Mingming Caodab291a2006-10-11 01:21:01 -07003118 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003119 }
Takashi Satoc4be0c12009-01-09 16:40:58 -08003120 return 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003121}
3122
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04003123static int ext4_remount(struct super_block *sb, int *flags, char *data)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003124{
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04003125 struct ext4_super_block *es;
Mingming Cao617ba132006-10-11 01:20:53 -07003126 struct ext4_sb_info *sbi = EXT4_SB(sb);
3127 ext4_fsblk_t n_blocks_count = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003128 unsigned long old_sb_flags;
Mingming Cao617ba132006-10-11 01:20:53 -07003129 struct ext4_mount_options old_opts;
Theodore Ts'o8a266462008-07-26 14:34:21 -04003130 ext4_group_t g;
Theodore Ts'ob3881f72009-01-05 22:46:26 -05003131 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003132 int err;
3133#ifdef CONFIG_QUOTA
3134 int i;
3135#endif
3136
3137 /* Store the original options */
3138 old_sb_flags = sb->s_flags;
3139 old_opts.s_mount_opt = sbi->s_mount_opt;
3140 old_opts.s_resuid = sbi->s_resuid;
3141 old_opts.s_resgid = sbi->s_resgid;
3142 old_opts.s_commit_interval = sbi->s_commit_interval;
Theodore Ts'o30773842009-01-03 20:27:38 -05003143 old_opts.s_min_batch_time = sbi->s_min_batch_time;
3144 old_opts.s_max_batch_time = sbi->s_max_batch_time;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003145#ifdef CONFIG_QUOTA
3146 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
3147 for (i = 0; i < MAXQUOTAS; i++)
3148 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
3149#endif
Theodore Ts'ob3881f72009-01-05 22:46:26 -05003150 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
3151 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003152
3153 /*
3154 * Allow the "check" option to be passed as a remount option.
3155 */
Theodore Ts'ob3881f72009-01-05 22:46:26 -05003156 if (!parse_options(data, sb, NULL, &journal_ioprio,
3157 &n_blocks_count, 1)) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003158 err = -EINVAL;
3159 goto restore_opts;
3160 }
3161
Mingming Cao617ba132006-10-11 01:20:53 -07003162 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT)
Harvey Harrison46e665e2008-04-17 10:38:59 -04003163 ext4_abort(sb, __func__, "Abort forced by user");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003164
3165 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
Mingming Cao617ba132006-10-11 01:20:53 -07003166 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003167
3168 es = sbi->s_es;
3169
Theodore Ts'ob3881f72009-01-05 22:46:26 -05003170 if (sbi->s_journal) {
Frank Mayhar03901312009-01-07 00:06:22 -05003171 ext4_init_journal_params(sb, sbi->s_journal);
Theodore Ts'ob3881f72009-01-05 22:46:26 -05003172 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
3173 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003174
3175 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07003176 n_blocks_count > ext4_blocks_count(es)) {
Mingming Cao617ba132006-10-11 01:20:53 -07003177 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003178 err = -EROFS;
3179 goto restore_opts;
3180 }
3181
3182 if (*flags & MS_RDONLY) {
3183 /*
3184 * First of all, the unconditional stuff we have to do
3185 * to disable replay of the journal when we next remount
3186 */
3187 sb->s_flags |= MS_RDONLY;
3188
3189 /*
3190 * OK, test if we are remounting a valid rw partition
3191 * readonly, and if so set the rdonly flag and then
3192 * mark the partition as valid again.
3193 */
Mingming Cao617ba132006-10-11 01:20:53 -07003194 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
3195 (sbi->s_mount_state & EXT4_VALID_FS))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003196 es->s_state = cpu_to_le16(sbi->s_mount_state);
3197
Jan Kara32c37732007-07-15 23:41:09 -07003198 /*
3199 * We have to unlock super so that we can wait for
3200 * transactions.
3201 */
Frank Mayhar03901312009-01-07 00:06:22 -05003202 if (sbi->s_journal) {
3203 unlock_super(sb);
3204 ext4_mark_recovery_complete(sb, es);
3205 lock_super(sb);
3206 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003207 } else {
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05003208 int ret;
Mingming Cao617ba132006-10-11 01:20:53 -07003209 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3210 ~EXT4_FEATURE_RO_COMPAT_SUPP))) {
3211 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003212 "remount RDWR because of unsupported "
Aneesh Kumar K.V3a06d772008-11-22 15:04:59 -05003213 "optional features (%x).\n", sb->s_id,
3214 (le32_to_cpu(sbi->s_es->s_feature_ro_compat) &
3215 ~EXT4_FEATURE_RO_COMPAT_SUPP));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003216 err = -EROFS;
3217 goto restore_opts;
3218 }
Eric Sandeenead65962007-02-10 01:46:08 -08003219
3220 /*
Theodore Ts'o8a266462008-07-26 14:34:21 -04003221 * Make sure the group descriptor checksums
3222 * are sane. If they aren't, refuse to
3223 * remount r/w.
3224 */
3225 for (g = 0; g < sbi->s_groups_count; g++) {
3226 struct ext4_group_desc *gdp =
3227 ext4_get_group_desc(sb, g, NULL);
3228
3229 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
3230 printk(KERN_ERR
3231 "EXT4-fs: ext4_remount: "
Theodore Ts'oa9df9a42009-01-05 22:18:16 -05003232 "Checksum for group %u failed (%u!=%u)\n",
Theodore Ts'o8a266462008-07-26 14:34:21 -04003233 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
3234 le16_to_cpu(gdp->bg_checksum));
3235 err = -EINVAL;
3236 goto restore_opts;
3237 }
3238 }
3239
3240 /*
Eric Sandeenead65962007-02-10 01:46:08 -08003241 * If we have an unprocessed orphan list hanging
3242 * around from a previously readonly bdev mount,
3243 * require a full umount/remount for now.
3244 */
3245 if (es->s_last_orphan) {
3246 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
3247 "remount RDWR because of unprocessed "
3248 "orphan inode list. Please "
3249 "umount/remount instead.\n",
3250 sb->s_id);
3251 err = -EINVAL;
3252 goto restore_opts;
3253 }
3254
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003255 /*
3256 * Mounting a RDONLY partition read-write, so reread
3257 * and store the current valid flag. (It may have
3258 * been changed by e2fsck since we originally mounted
3259 * the partition.)
3260 */
Frank Mayhar03901312009-01-07 00:06:22 -05003261 if (sbi->s_journal)
3262 ext4_clear_journal_err(sb, es);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003263 sbi->s_mount_state = le16_to_cpu(es->s_state);
Mingming Cao617ba132006-10-11 01:20:53 -07003264 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003265 goto restore_opts;
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04003266 if (!ext4_setup_super(sb, es, 0))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003267 sb->s_flags &= ~MS_RDONLY;
3268 }
3269 }
Frank Mayhar03901312009-01-07 00:06:22 -05003270 if (sbi->s_journal == NULL)
3271 ext4_commit_super(sb, es, 1);
3272
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003273#ifdef CONFIG_QUOTA
3274 /* Release old quota file names */
3275 for (i = 0; i < MAXQUOTAS; i++)
3276 if (old_opts.s_qf_names[i] &&
3277 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3278 kfree(old_opts.s_qf_names[i]);
3279#endif
3280 return 0;
3281restore_opts:
3282 sb->s_flags = old_sb_flags;
3283 sbi->s_mount_opt = old_opts.s_mount_opt;
3284 sbi->s_resuid = old_opts.s_resuid;
3285 sbi->s_resgid = old_opts.s_resgid;
3286 sbi->s_commit_interval = old_opts.s_commit_interval;
Theodore Ts'o30773842009-01-03 20:27:38 -05003287 sbi->s_min_batch_time = old_opts.s_min_batch_time;
3288 sbi->s_max_batch_time = old_opts.s_max_batch_time;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003289#ifdef CONFIG_QUOTA
3290 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
3291 for (i = 0; i < MAXQUOTAS; i++) {
3292 if (sbi->s_qf_names[i] &&
3293 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3294 kfree(sbi->s_qf_names[i]);
3295 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
3296 }
3297#endif
3298 return err;
3299}
3300
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04003301static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003302{
3303 struct super_block *sb = dentry->d_sb;
Mingming Cao617ba132006-10-11 01:20:53 -07003304 struct ext4_sb_info *sbi = EXT4_SB(sb);
3305 struct ext4_super_block *es = sbi->s_es;
Pekka Enberg960cc392006-12-06 20:35:29 -08003306 u64 fsid;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003307
Badari Pulavarty5e700302007-07-15 23:42:00 -07003308 if (test_opt(sb, MINIX_DF)) {
3309 sbi->s_overhead_last = 0;
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -04003310 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
Avantika Mathurfd2d4292008-01-28 23:58:27 -05003311 ext4_group_t ngroups = sbi->s_groups_count, i;
Badari Pulavarty5e700302007-07-15 23:42:00 -07003312 ext4_fsblk_t overhead = 0;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003313 smp_rmb();
3314
3315 /*
Badari Pulavarty5e700302007-07-15 23:42:00 -07003316 * Compute the overhead (FS structures). This is constant
3317 * for a given filesystem unless the number of block groups
3318 * changes so we cache the previous value until it does.
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003319 */
3320
3321 /*
3322 * All of the blocks before first_data_block are
3323 * overhead
3324 */
3325 overhead = le32_to_cpu(es->s_first_data_block);
3326
3327 /*
3328 * Add the overhead attributed to the superblock and
3329 * block group descriptors. If the sparse superblocks
3330 * feature is turned on, then not all groups have this.
3331 */
3332 for (i = 0; i < ngroups; i++) {
Mingming Cao617ba132006-10-11 01:20:53 -07003333 overhead += ext4_bg_has_super(sb, i) +
3334 ext4_bg_num_gdb(sb, i);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003335 cond_resched();
3336 }
3337
3338 /*
3339 * Every block group has an inode bitmap, a block
3340 * bitmap, and an inode table.
3341 */
Badari Pulavarty5e700302007-07-15 23:42:00 -07003342 overhead += ngroups * (2 + sbi->s_itb_per_group);
3343 sbi->s_overhead_last = overhead;
3344 smp_wmb();
Aneesh Kumar K.V6bc9fef2007-10-16 18:38:25 -04003345 sbi->s_blocks_last = ext4_blocks_count(es);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003346 }
3347
Mingming Cao617ba132006-10-11 01:20:53 -07003348 buf->f_type = EXT4_SUPER_MAGIC;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003349 buf->f_bsize = sb->s_blocksize;
Badari Pulavarty5e700302007-07-15 23:42:00 -07003350 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
Aneesh Kumar K.V6bc6e632008-10-10 09:39:00 -04003351 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) -
3352 percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter);
Aneesh Kumar K.V308ba3e2007-10-16 18:38:25 -04003353 ext4_free_blocks_count_set(es, buf->f_bfree);
Laurent Vivierbd81d8e2006-10-11 01:21:10 -07003354 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
3355 if (buf->f_bfree < ext4_r_blocks_count(es))
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003356 buf->f_bavail = 0;
3357 buf->f_files = le32_to_cpu(es->s_inodes_count);
Peter Zijlstra52d9f3b2007-10-16 23:25:44 -07003358 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
Badari Pulavarty5e700302007-07-15 23:42:00 -07003359 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
Mingming Cao617ba132006-10-11 01:20:53 -07003360 buf->f_namelen = EXT4_NAME_LEN;
Pekka Enberg960cc392006-12-06 20:35:29 -08003361 fsid = le64_to_cpup((void *)es->s_uuid) ^
3362 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
3363 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
3364 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003365 return 0;
3366}
3367
3368/* Helper function for writing quotas on sync - we need to start transaction before quota file
3369 * is locked for write. Otherwise the are possible deadlocks:
3370 * Process 1 Process 2
Mingming Cao617ba132006-10-11 01:20:53 -07003371 * ext4_create() quota_sync()
Jan Karaa269eb12009-01-26 17:04:39 +01003372 * jbd2_journal_start() write_dquot()
3373 * vfs_dq_init() down(dqio_mutex)
Mingming Caodab291a2006-10-11 01:21:01 -07003374 * down(dqio_mutex) jbd2_journal_start()
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003375 *
3376 */
3377
3378#ifdef CONFIG_QUOTA
3379
3380static inline struct inode *dquot_to_inode(struct dquot *dquot)
3381{
3382 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
3383}
3384
Mingming Cao617ba132006-10-11 01:20:53 -07003385static int ext4_write_dquot(struct dquot *dquot)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003386{
3387 int ret, err;
3388 handle_t *handle;
3389 struct inode *inode;
3390
3391 inode = dquot_to_inode(dquot);
Mingming Cao617ba132006-10-11 01:20:53 -07003392 handle = ext4_journal_start(inode,
3393 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003394 if (IS_ERR(handle))
3395 return PTR_ERR(handle);
3396 ret = dquot_commit(dquot);
Mingming Cao617ba132006-10-11 01:20:53 -07003397 err = ext4_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003398 if (!ret)
3399 ret = err;
3400 return ret;
3401}
3402
Mingming Cao617ba132006-10-11 01:20:53 -07003403static int ext4_acquire_dquot(struct dquot *dquot)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003404{
3405 int ret, err;
3406 handle_t *handle;
3407
Mingming Cao617ba132006-10-11 01:20:53 -07003408 handle = ext4_journal_start(dquot_to_inode(dquot),
3409 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003410 if (IS_ERR(handle))
3411 return PTR_ERR(handle);
3412 ret = dquot_acquire(dquot);
Mingming Cao617ba132006-10-11 01:20:53 -07003413 err = ext4_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003414 if (!ret)
3415 ret = err;
3416 return ret;
3417}
3418
Mingming Cao617ba132006-10-11 01:20:53 -07003419static int ext4_release_dquot(struct dquot *dquot)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003420{
3421 int ret, err;
3422 handle_t *handle;
3423
Mingming Cao617ba132006-10-11 01:20:53 -07003424 handle = ext4_journal_start(dquot_to_inode(dquot),
3425 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
Jan Kara9c3013e2007-09-11 15:23:29 -07003426 if (IS_ERR(handle)) {
3427 /* Release dquot anyway to avoid endless cycle in dqput() */
3428 dquot_release(dquot);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003429 return PTR_ERR(handle);
Jan Kara9c3013e2007-09-11 15:23:29 -07003430 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003431 ret = dquot_release(dquot);
Mingming Cao617ba132006-10-11 01:20:53 -07003432 err = ext4_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003433 if (!ret)
3434 ret = err;
3435 return ret;
3436}
3437
Mingming Cao617ba132006-10-11 01:20:53 -07003438static int ext4_mark_dquot_dirty(struct dquot *dquot)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003439{
Jan Kara2c8be6b2008-05-13 21:27:55 -04003440 /* Are we journaling quotas? */
Mingming Cao617ba132006-10-11 01:20:53 -07003441 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
3442 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003443 dquot_mark_dquot_dirty(dquot);
Mingming Cao617ba132006-10-11 01:20:53 -07003444 return ext4_write_dquot(dquot);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003445 } else {
3446 return dquot_mark_dquot_dirty(dquot);
3447 }
3448}
3449
Mingming Cao617ba132006-10-11 01:20:53 -07003450static int ext4_write_info(struct super_block *sb, int type)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003451{
3452 int ret, err;
3453 handle_t *handle;
3454
3455 /* Data block + inode block */
Mingming Cao617ba132006-10-11 01:20:53 -07003456 handle = ext4_journal_start(sb->s_root->d_inode, 2);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003457 if (IS_ERR(handle))
3458 return PTR_ERR(handle);
3459 ret = dquot_commit_info(sb, type);
Mingming Cao617ba132006-10-11 01:20:53 -07003460 err = ext4_journal_stop(handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003461 if (!ret)
3462 ret = err;
3463 return ret;
3464}
3465
3466/*
3467 * Turn on quotas during mount time - we need to find
3468 * the quota file and such...
3469 */
Mingming Cao617ba132006-10-11 01:20:53 -07003470static int ext4_quota_on_mount(struct super_block *sb, int type)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003471{
Mingming Cao617ba132006-10-11 01:20:53 -07003472 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
3473 EXT4_SB(sb)->s_jquota_fmt, type);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003474}
3475
3476/*
3477 * Standard function to be called on quota_on
3478 */
Mingming Cao617ba132006-10-11 01:20:53 -07003479static int ext4_quota_on(struct super_block *sb, int type, int format_id,
Al Viro82646132008-08-02 00:57:06 -04003480 char *name, int remount)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003481{
3482 int err;
Al Viro82646132008-08-02 00:57:06 -04003483 struct path path;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003484
3485 if (!test_opt(sb, QUOTA))
3486 return -EINVAL;
Al Viro82646132008-08-02 00:57:06 -04003487 /* When remounting, no checks are needed and in fact, name is NULL */
Jan Kara06235432008-05-13 19:11:51 -04003488 if (remount)
Al Viro82646132008-08-02 00:57:06 -04003489 return vfs_quota_on(sb, type, format_id, name, remount);
Jan Kara06235432008-05-13 19:11:51 -04003490
Al Viro82646132008-08-02 00:57:06 -04003491 err = kern_path(name, LOOKUP_FOLLOW, &path);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003492 if (err)
3493 return err;
Jan Kara06235432008-05-13 19:11:51 -04003494
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003495 /* Quotafile not on the same filesystem? */
Al Viro82646132008-08-02 00:57:06 -04003496 if (path.mnt->mnt_sb != sb) {
3497 path_put(&path);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003498 return -EXDEV;
3499 }
Jan Kara06235432008-05-13 19:11:51 -04003500 /* Journaling quota? */
3501 if (EXT4_SB(sb)->s_qf_names[type]) {
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04003502 /* Quotafile not in fs root? */
Al Viro82646132008-08-02 00:57:06 -04003503 if (path.dentry->d_parent != sb->s_root)
Jan Kara06235432008-05-13 19:11:51 -04003504 printk(KERN_WARNING
3505 "EXT4-fs: Quota file not on filesystem root. "
3506 "Journaled quota will not work.\n");
Theodore Ts'o2b2d6d02008-07-26 16:15:44 -04003507 }
Jan Kara06235432008-05-13 19:11:51 -04003508
3509 /*
3510 * When we journal data on quota file, we have to flush journal to see
3511 * all updates to the file when we bypass pagecache...
3512 */
Frank Mayhar03901312009-01-07 00:06:22 -05003513 if (EXT4_SB(sb)->s_journal &&
3514 ext4_should_journal_data(path.dentry->d_inode)) {
Jan Kara06235432008-05-13 19:11:51 -04003515 /*
3516 * We don't need to lock updates but journal_flush() could
3517 * otherwise be livelocked...
3518 */
3519 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
Hidehiro Kawai7ffe1ea2008-10-10 20:29:21 -04003520 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
Jan Kara06235432008-05-13 19:11:51 -04003521 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
Hidehiro Kawai7ffe1ea2008-10-10 20:29:21 -04003522 if (err) {
Al Viro82646132008-08-02 00:57:06 -04003523 path_put(&path);
Hidehiro Kawai7ffe1ea2008-10-10 20:29:21 -04003524 return err;
3525 }
Jan Kara06235432008-05-13 19:11:51 -04003526 }
3527
Al Viro82646132008-08-02 00:57:06 -04003528 err = vfs_quota_on_path(sb, type, format_id, &path);
3529 path_put(&path);
Al Viro77e69da2008-08-01 04:29:18 -04003530 return err;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003531}
3532
3533/* Read data from quotafile - avoid pagecache and such because we cannot afford
3534 * acquiring the locks... As quota files are never truncated and quota code
3535 * itself serializes the operations (and noone else should touch the files)
3536 * we don't have to be afraid of races */
Mingming Cao617ba132006-10-11 01:20:53 -07003537static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003538 size_t len, loff_t off)
3539{
3540 struct inode *inode = sb_dqopt(sb)->files[type];
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05003541 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003542 int err = 0;
3543 int offset = off & (sb->s_blocksize - 1);
3544 int tocopy;
3545 size_t toread;
3546 struct buffer_head *bh;
3547 loff_t i_size = i_size_read(inode);
3548
3549 if (off > i_size)
3550 return 0;
3551 if (off+len > i_size)
3552 len = i_size-off;
3553 toread = len;
3554 while (toread > 0) {
3555 tocopy = sb->s_blocksize - offset < toread ?
3556 sb->s_blocksize - offset : toread;
Mingming Cao617ba132006-10-11 01:20:53 -07003557 bh = ext4_bread(NULL, inode, blk, 0, &err);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003558 if (err)
3559 return err;
3560 if (!bh) /* A hole? */
3561 memset(data, 0, tocopy);
3562 else
3563 memcpy(data, bh->b_data+offset, tocopy);
3564 brelse(bh);
3565 offset = 0;
3566 toread -= tocopy;
3567 data += tocopy;
3568 blk++;
3569 }
3570 return len;
3571}
3572
3573/* Write to quotafile (we know the transaction is already started and has
3574 * enough credits) */
Mingming Cao617ba132006-10-11 01:20:53 -07003575static ssize_t ext4_quota_write(struct super_block *sb, int type,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003576 const char *data, size_t len, loff_t off)
3577{
3578 struct inode *inode = sb_dqopt(sb)->files[type];
Aneesh Kumar K.V725d26d2008-01-28 23:58:27 -05003579 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003580 int err = 0;
3581 int offset = off & (sb->s_blocksize - 1);
3582 int tocopy;
Mingming Cao617ba132006-10-11 01:20:53 -07003583 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003584 size_t towrite = len;
3585 struct buffer_head *bh;
3586 handle_t *handle = journal_current_handle();
3587
Frank Mayhar03901312009-01-07 00:06:22 -05003588 if (EXT4_SB(sb)->s_journal && !handle) {
Theodore Ts'oe5f8eab82008-09-08 22:25:04 -04003589 printk(KERN_WARNING "EXT4-fs: Quota write (off=%llu, len=%llu)"
Jan Kara9c3013e2007-09-11 15:23:29 -07003590 " cancelled because transaction is not started.\n",
3591 (unsigned long long)off, (unsigned long long)len);
3592 return -EIO;
3593 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003594 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
3595 while (towrite > 0) {
3596 tocopy = sb->s_blocksize - offset < towrite ?
3597 sb->s_blocksize - offset : towrite;
Mingming Cao617ba132006-10-11 01:20:53 -07003598 bh = ext4_bread(handle, inode, blk, 1, &err);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003599 if (!bh)
3600 goto out;
3601 if (journal_quota) {
Mingming Cao617ba132006-10-11 01:20:53 -07003602 err = ext4_journal_get_write_access(handle, bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003603 if (err) {
3604 brelse(bh);
3605 goto out;
3606 }
3607 }
3608 lock_buffer(bh);
3609 memcpy(bh->b_data+offset, data, tocopy);
3610 flush_dcache_page(bh->b_page);
3611 unlock_buffer(bh);
3612 if (journal_quota)
Frank Mayhar03901312009-01-07 00:06:22 -05003613 err = ext4_handle_dirty_metadata(handle, NULL, bh);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003614 else {
3615 /* Always do at least ordered writes for quotas */
Jan Kara678aaf42008-07-11 19:27:31 -04003616 err = ext4_jbd2_file_inode(handle, inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003617 mark_buffer_dirty(bh);
3618 }
3619 brelse(bh);
3620 if (err)
3621 goto out;
3622 offset = 0;
3623 towrite -= tocopy;
3624 data += tocopy;
3625 blk++;
3626 }
3627out:
Jan Kara4d04e4f2008-07-04 09:59:34 -07003628 if (len == towrite) {
3629 mutex_unlock(&inode->i_mutex);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003630 return err;
Jan Kara4d04e4f2008-07-04 09:59:34 -07003631 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003632 if (inode->i_size < off+len-towrite) {
3633 i_size_write(inode, off+len-towrite);
Mingming Cao617ba132006-10-11 01:20:53 -07003634 EXT4_I(inode)->i_disksize = inode->i_size;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003635 }
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003636 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
Mingming Cao617ba132006-10-11 01:20:53 -07003637 ext4_mark_inode_dirty(handle, inode);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003638 mutex_unlock(&inode->i_mutex);
3639 return len - towrite;
3640}
3641
3642#endif
3643
Mingming Cao617ba132006-10-11 01:20:53 -07003644static int ext4_get_sb(struct file_system_type *fs_type,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003645 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3646{
Mingming Cao617ba132006-10-11 01:20:53 -07003647 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003648}
3649
Theodore Ts'o5e8814f2008-09-23 18:07:35 -04003650#ifdef CONFIG_PROC_FS
3651static int ext4_ui_proc_show(struct seq_file *m, void *v)
3652{
3653 unsigned int *p = m->private;
3654
3655 seq_printf(m, "%u\n", *p);
3656 return 0;
3657}
3658
3659static int ext4_ui_proc_open(struct inode *inode, struct file *file)
3660{
3661 return single_open(file, ext4_ui_proc_show, PDE(inode)->data);
3662}
3663
3664static ssize_t ext4_ui_proc_write(struct file *file, const char __user *buf,
3665 size_t cnt, loff_t *ppos)
3666{
Roel Kluin23475e22008-11-26 02:23:19 -05003667 unsigned long *p = PDE(file->f_path.dentry->d_inode)->data;
Theodore Ts'o5e8814f2008-09-23 18:07:35 -04003668 char str[32];
Theodore Ts'o5e8814f2008-09-23 18:07:35 -04003669
3670 if (cnt >= sizeof(str))
3671 return -EINVAL;
3672 if (copy_from_user(str, buf, cnt))
3673 return -EFAULT;
Roel Kluin23475e22008-11-26 02:23:19 -05003674
3675 *p = simple_strtoul(str, NULL, 0);
Theodore Ts'o5e8814f2008-09-23 18:07:35 -04003676 return cnt;
3677}
3678
3679const struct file_operations ext4_ui_proc_fops = {
3680 .owner = THIS_MODULE,
3681 .open = ext4_ui_proc_open,
3682 .read = seq_read,
3683 .llseek = seq_lseek,
3684 .release = single_release,
3685 .write = ext4_ui_proc_write,
3686};
3687#endif
3688
Theodore Ts'o03010a32008-10-10 20:02:48 -04003689static struct file_system_type ext4_fs_type = {
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003690 .owner = THIS_MODULE,
Theodore Ts'o03010a32008-10-10 20:02:48 -04003691 .name = "ext4",
Mingming Cao617ba132006-10-11 01:20:53 -07003692 .get_sb = ext4_get_sb,
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003693 .kill_sb = kill_block_super,
3694 .fs_flags = FS_REQUIRES_DEV,
3695};
3696
Theodore Ts'o03010a32008-10-10 20:02:48 -04003697#ifdef CONFIG_EXT4DEV_COMPAT
3698static int ext4dev_get_sb(struct file_system_type *fs_type,
3699 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3700{
3701 printk(KERN_WARNING "EXT4-fs: Update your userspace programs "
3702 "to mount using ext4\n");
3703 printk(KERN_WARNING "EXT4-fs: ext4dev backwards compatibility "
3704 "will go away by 2.6.31\n");
3705 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
3706}
3707
3708static struct file_system_type ext4dev_fs_type = {
3709 .owner = THIS_MODULE,
3710 .name = "ext4dev",
3711 .get_sb = ext4dev_get_sb,
3712 .kill_sb = kill_block_super,
3713 .fs_flags = FS_REQUIRES_DEV,
3714};
3715MODULE_ALIAS("ext4dev");
3716#endif
3717
Mingming Cao617ba132006-10-11 01:20:53 -07003718static int __init init_ext4_fs(void)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003719{
Alex Tomasc9de5602008-01-29 00:19:52 -05003720 int err;
3721
Theodore Ts'o9f6200b2008-09-23 09:18:24 -04003722 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
Alex Tomasc9de5602008-01-29 00:19:52 -05003723 err = init_ext4_mballoc();
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003724 if (err)
3725 return err;
Alex Tomasc9de5602008-01-29 00:19:52 -05003726
3727 err = init_ext4_xattr();
3728 if (err)
3729 goto out2;
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003730 err = init_inodecache();
3731 if (err)
3732 goto out1;
Theodore Ts'o03010a32008-10-10 20:02:48 -04003733 err = register_filesystem(&ext4_fs_type);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003734 if (err)
3735 goto out;
Theodore Ts'o03010a32008-10-10 20:02:48 -04003736#ifdef CONFIG_EXT4DEV_COMPAT
3737 err = register_filesystem(&ext4dev_fs_type);
3738 if (err) {
3739 unregister_filesystem(&ext4_fs_type);
3740 goto out;
3741 }
3742#endif
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003743 return 0;
3744out:
3745 destroy_inodecache();
3746out1:
Mingming Cao617ba132006-10-11 01:20:53 -07003747 exit_ext4_xattr();
Alex Tomasc9de5602008-01-29 00:19:52 -05003748out2:
3749 exit_ext4_mballoc();
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003750 return err;
3751}
3752
Mingming Cao617ba132006-10-11 01:20:53 -07003753static void __exit exit_ext4_fs(void)
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003754{
Theodore Ts'o03010a32008-10-10 20:02:48 -04003755 unregister_filesystem(&ext4_fs_type);
3756#ifdef CONFIG_EXT4DEV_COMPAT
Mingming Cao617ba132006-10-11 01:20:53 -07003757 unregister_filesystem(&ext4dev_fs_type);
Theodore Ts'o03010a32008-10-10 20:02:48 -04003758#endif
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003759 destroy_inodecache();
Mingming Cao617ba132006-10-11 01:20:53 -07003760 exit_ext4_xattr();
Alex Tomasc9de5602008-01-29 00:19:52 -05003761 exit_ext4_mballoc();
Theodore Ts'o9f6200b2008-09-23 09:18:24 -04003762 remove_proc_entry("fs/ext4", NULL);
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003763}
3764
3765MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
Theodore Ts'o83982b62009-01-06 14:53:16 -05003766MODULE_DESCRIPTION("Fourth Extended Filesystem");
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003767MODULE_LICENSE("GPL");
Mingming Cao617ba132006-10-11 01:20:53 -07003768module_init(init_ext4_fs)
3769module_exit(exit_ext4_fs)