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ext4: Add EXT4_IOC_MIGRATE ioctl
[linux.git] / fs / ext4 / super.c
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ac27a0ec 1/*
617ba13b 2 * linux/fs/ext4/super.c
ac27a0ec
DK		 3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card ([email protected])
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 ([email protected]), 1995
17 */
18
19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
dab291af 23#include <linux/jbd2.h>
617ba13b 24#include <linux/ext4_fs.h>
dab291af 25#include <linux/ext4_jbd2.h>
ac27a0ec
DK		 26#include <linux/slab.h>
27#include <linux/init.h>
28#include <linux/blkdev.h>
29#include <linux/parser.h>
30#include <linux/smp_lock.h>
31#include <linux/buffer_head.h>
a5694255 32#include <linux/exportfs.h>
ac27a0ec
DK		 33#include <linux/vfs.h>
34#include <linux/random.h>
35#include <linux/mount.h>
36#include <linux/namei.h>
37#include <linux/quotaops.h>
38#include <linux/seq_file.h>
1330593e 39#include <linux/log2.h>
717d50e4 40#include <linux/crc16.h>
ac27a0ec
DK		 41
42#include <asm/uaccess.h>
43
44#include "xattr.h"
45#include "acl.h"
46#include "namei.h"
717d50e4 47#include "group.h"
ac27a0ec 48
617ba13b 49static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 50 unsigned long journal_devnum);
617ba13b 51static int ext4_create_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 52 unsigned int);
617ba13b
MC		 53static void ext4_commit_super (struct super_block * sb,
54 struct ext4_super_block * es,
ac27a0ec 55 int sync);
617ba13b
MC		 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);
60static int ext4_sync_fs(struct super_block *sb, int wait);
61static const char *ext4_decode_error(struct super_block * sb, int errno,
ac27a0ec 62 char nbuf[16]);
617ba13b
MC		 63static int ext4_remount (struct super_block * sb, int * flags, char * data);
64static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf);
65static void ext4_unlockfs(struct super_block *sb);
66static void ext4_write_super (struct super_block * sb);
67static void ext4_write_super_lockfs(struct super_block *sb);
ac27a0ec 68
bd81d8ee 69
8fadc143
AR		 70ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
71 struct ext4_group_desc *bg)
bd81d8ee 72{
3a14589c 73 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 74 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
3a14589c 75 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 76}
77
8fadc143
AR		 78ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
79 struct ext4_group_desc *bg)
bd81d8ee 80{
5272f837 81 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 82 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
5272f837 83 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 84}
85
8fadc143
AR		 86ext4_fsblk_t ext4_inode_table(struct super_block *sb,
87 struct ext4_group_desc *bg)
bd81d8ee 88{
5272f837 89 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 90 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
5272f837 91 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 92}
93
8fadc143
AR		 94void ext4_block_bitmap_set(struct super_block *sb,
95 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 96{
3a14589c 97 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 98 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
99 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 100}
101
8fadc143
AR		 102void ext4_inode_bitmap_set(struct super_block *sb,
103 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 104{
5272f837 105 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 106 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
107 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 108}
109
8fadc143
AR		 110void ext4_inode_table_set(struct super_block *sb,
111 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 112{
5272f837 113 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 114 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
115 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 116}
117
ac27a0ec 118/*
dab291af 119 * Wrappers for jbd2_journal_start/end.
ac27a0ec
DK		 120 *
121 * The only special thing we need to do here is to make sure that all
122 * journal_end calls result in the superblock being marked dirty, so
123 * that sync() will call the filesystem's write_super callback if
124 * appropriate.
125 */
617ba13b 126handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
ac27a0ec
DK		 127{
128 journal_t *journal;
129
130 if (sb->s_flags & MS_RDONLY)
131 return ERR_PTR(-EROFS);
132
133 /* Special case here: if the journal has aborted behind our
134 * backs (eg. EIO in the commit thread), then we still need to
135 * take the FS itself readonly cleanly. */
617ba13b 136 journal = EXT4_SB(sb)->s_journal;
ac27a0ec 137 if (is_journal_aborted(journal)) {
617ba13b 138 ext4_abort(sb, __FUNCTION__,
ac27a0ec
DK		 139 "Detected aborted journal");
140 return ERR_PTR(-EROFS);
141 }
142
dab291af 143 return jbd2_journal_start(journal, nblocks);
ac27a0ec
DK		 144}
145
146/*
147 * The only special thing we need to do here is to make sure that all
dab291af 148 * jbd2_journal_stop calls result in the superblock being marked dirty, so
ac27a0ec
DK		 149 * that sync() will call the filesystem's write_super callback if
150 * appropriate.
151 */
617ba13b 152int __ext4_journal_stop(const char *where, handle_t *handle)
ac27a0ec
DK		 153{
154 struct super_block *sb;
155 int err;
156 int rc;
157
158 sb = handle->h_transaction->t_journal->j_private;
159 err = handle->h_err;
dab291af 160 rc = jbd2_journal_stop(handle);
ac27a0ec
DK		 161
162 if (!err)
163 err = rc;
164 if (err)
617ba13b 165 __ext4_std_error(sb, where, err);
ac27a0ec
DK		 166 return err;
167}
168
617ba13b 169void ext4_journal_abort_handle(const char *caller, const char *err_fn,
ac27a0ec
DK		 170 struct buffer_head *bh, handle_t *handle, int err)
171{
172 char nbuf[16];
617ba13b 173 const char *errstr = ext4_decode_error(NULL, err, nbuf);
ac27a0ec
DK		 174
175 if (bh)
176 BUFFER_TRACE(bh, "abort");
177
178 if (!handle->h_err)
179 handle->h_err = err;
180
181 if (is_handle_aborted(handle))
182 return;
183
184 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
185 caller, errstr, err_fn);
186
dab291af 187 jbd2_journal_abort_handle(handle);
ac27a0ec
DK		 188}
189
190/* Deal with the reporting of failure conditions on a filesystem such as
191 * inconsistencies detected or read IO failures.
192 *
193 * On ext2, we can store the error state of the filesystem in the
617ba13b 194 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 195 * write ordering constraints on the superblock which prevent us from
196 * writing it out straight away; and given that the journal is about to
197 * be aborted, we can't rely on the current, or future, transactions to
198 * write out the superblock safely.
199 *
dab291af 200 * We'll just use the jbd2_journal_abort() error code to record an error in
ac27a0ec
DK		 201 * the journal instead. On recovery, the journal will compain about
202 * that error until we've noted it down and cleared it.
203 */
204
617ba13b 205static void ext4_handle_error(struct super_block *sb)
ac27a0ec 206{
617ba13b 207 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 208
617ba13b
MC		 209 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
210 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
ac27a0ec
DK		 211
212 if (sb->s_flags & MS_RDONLY)
213 return;
214
215 if (!test_opt (sb, ERRORS_CONT)) {
617ba13b 216 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 217
617ba13b 218 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
ac27a0ec 219 if (journal)
dab291af 220 jbd2_journal_abort(journal, -EIO);
ac27a0ec
DK		 221 }
222 if (test_opt (sb, ERRORS_RO)) {
223 printk (KERN_CRIT "Remounting filesystem read-only\n");
224 sb->s_flags |= MS_RDONLY;
225 }
617ba13b 226 ext4_commit_super(sb, es, 1);
ac27a0ec 227 if (test_opt(sb, ERRORS_PANIC))
617ba13b 228 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec
DK		 229 sb->s_id);
230}
231
617ba13b 232void ext4_error (struct super_block * sb, const char * function,
ac27a0ec
DK		 233 const char * fmt, ...)
234{
235 va_list args;
236
237 va_start(args, fmt);
617ba13b 238 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function);
ac27a0ec
DK		 239 vprintk(fmt, args);
240 printk("\n");
241 va_end(args);
242
617ba13b 243 ext4_handle_error(sb);
ac27a0ec
DK		 244}
245
617ba13b 246static const char *ext4_decode_error(struct super_block * sb, int errno,
ac27a0ec
DK		 247 char nbuf[16])
248{
249 char *errstr = NULL;
250
251 switch (errno) {
252 case -EIO:
253 errstr = "IO failure";
254 break;
255 case -ENOMEM:
256 errstr = "Out of memory";
257 break;
258 case -EROFS:
dab291af 259 if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)
ac27a0ec
DK		 260 errstr = "Journal has aborted";
261 else
262 errstr = "Readonly filesystem";
263 break;
264 default:
265 /* If the caller passed in an extra buffer for unknown
266 * errors, textualise them now. Else we just return
267 * NULL. */
268 if (nbuf) {
269 /* Check for truncated error codes... */
270 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
271 errstr = nbuf;
272 }
273 break;
274 }
275
276 return errstr;
277}
278
617ba13b 279/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 280 * automatically and invokes the appropriate error response. */
281
617ba13b 282void __ext4_std_error (struct super_block * sb, const char * function,
ac27a0ec
DK		 283 int errno)
284{
285 char nbuf[16];
286 const char *errstr;
287
288 /* Special case: if the error is EROFS, and we're not already
289 * inside a transaction, then there's really no point in logging
290 * an error. */
291 if (errno == -EROFS && journal_current_handle() == NULL &&
292 (sb->s_flags & MS_RDONLY))
293 return;
294
617ba13b
MC		 295 errstr = ext4_decode_error(sb, errno, nbuf);
296 printk (KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n",
ac27a0ec
DK		 297 sb->s_id, function, errstr);
298
617ba13b 299 ext4_handle_error(sb);
ac27a0ec
DK		 300}
301
302/*
617ba13b 303 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 304 * abort function may be used to deal with unrecoverable failures such
305 * as journal IO errors or ENOMEM at a critical moment in log management.
306 *
307 * We unconditionally force the filesystem into an ABORT|READONLY state,
308 * unless the error response on the fs has been set to panic in which
309 * case we take the easy way out and panic immediately.
310 */
311
617ba13b 312void ext4_abort (struct super_block * sb, const char * function,
ac27a0ec
DK		 313 const char * fmt, ...)
314{
315 va_list args;
316
617ba13b 317 printk (KERN_CRIT "ext4_abort called.\n");
ac27a0ec
DK		 318
319 va_start(args, fmt);
617ba13b 320 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function);
ac27a0ec
DK		 321 vprintk(fmt, args);
322 printk("\n");
323 va_end(args);
324
325 if (test_opt(sb, ERRORS_PANIC))
617ba13b 326 panic("EXT4-fs panic from previous error\n");
ac27a0ec
DK		 327
328 if (sb->s_flags & MS_RDONLY)
329 return;
330
331 printk(KERN_CRIT "Remounting filesystem read-only\n");
617ba13b 332 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
ac27a0ec 333 sb->s_flags |= MS_RDONLY;
617ba13b 334 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
dab291af 335 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
ac27a0ec
DK		 336}
337
617ba13b 338void ext4_warning (struct super_block * sb, const char * function,
ac27a0ec
DK		 339 const char * fmt, ...)
340{
341 va_list args;
342
343 va_start(args, fmt);
617ba13b 344 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ",
ac27a0ec
DK		 345 sb->s_id, function);
346 vprintk(fmt, args);
347 printk("\n");
348 va_end(args);
349}
350
617ba13b 351void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 352{
617ba13b 353 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 354
617ba13b 355 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 356 return;
357
617ba13b 358 ext4_warning(sb, __FUNCTION__,
ac27a0ec
DK		 359 "updating to rev %d because of new feature flag, "
360 "running e2fsck is recommended",
617ba13b 361 EXT4_DYNAMIC_REV);
ac27a0ec 362
617ba13b
MC		 363 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
364 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
365 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 366 /* leave es->s_feature_*compat flags alone */
367 /* es->s_uuid will be set by e2fsck if empty */
368
369 /*
370 * The rest of the superblock fields should be zero, and if not it
371 * means they are likely already in use, so leave them alone. We
372 * can leave it up to e2fsck to clean up any inconsistencies there.
373 */
374}
375
99e6f829
AK		 376int ext4_update_compat_feature(handle_t *handle,
377 struct super_block *sb, __u32 compat)
378{
379 int err = 0;
380 if (!EXT4_HAS_COMPAT_FEATURE(sb, compat)) {
381 err = ext4_journal_get_write_access(handle,
382 EXT4_SB(sb)->s_sbh);
383 if (err)
384 return err;
385 EXT4_SET_COMPAT_FEATURE(sb, compat);
386 sb->s_dirt = 1;
387 handle->h_sync = 1;
388 BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
389 "call ext4_journal_dirty_met adata");
390 err = ext4_journal_dirty_metadata(handle,
391 EXT4_SB(sb)->s_sbh);
392 }
393 return err;
394}
395
396int ext4_update_rocompat_feature(handle_t *handle,
397 struct super_block *sb, __u32 rocompat)
398{
399 int err = 0;
400 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, rocompat)) {
401 err = ext4_journal_get_write_access(handle,
402 EXT4_SB(sb)->s_sbh);
403 if (err)
404 return err;
405 EXT4_SET_RO_COMPAT_FEATURE(sb, rocompat);
406 sb->s_dirt = 1;
407 handle->h_sync = 1;
408 BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
409 "call ext4_journal_dirty_met adata");
410 err = ext4_journal_dirty_metadata(handle,
411 EXT4_SB(sb)->s_sbh);
412 }
413 return err;
414}
415
416int ext4_update_incompat_feature(handle_t *handle,
417 struct super_block *sb, __u32 incompat)
418{
419 int err = 0;
420 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, incompat)) {
421 err = ext4_journal_get_write_access(handle,
422 EXT4_SB(sb)->s_sbh);
423 if (err)
424 return err;
425 EXT4_SET_INCOMPAT_FEATURE(sb, incompat);
426 sb->s_dirt = 1;
427 handle->h_sync = 1;
428 BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
429 "call ext4_journal_dirty_met adata");
430 err = ext4_journal_dirty_metadata(handle,
431 EXT4_SB(sb)->s_sbh);
432 }
433 return err;
434}
435
ac27a0ec
DK		 436/*
437 * Open the external journal device
438 */
617ba13b 439static struct block_device *ext4_blkdev_get(dev_t dev)
ac27a0ec
DK		 440{
441 struct block_device *bdev;
442 char b[BDEVNAME_SIZE];
443
444 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
445 if (IS_ERR(bdev))
446 goto fail;
447 return bdev;
448
449fail:
617ba13b 450 printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n",
ac27a0ec
DK		 451 __bdevname(dev, b), PTR_ERR(bdev));
452 return NULL;
453}
454
455/*
456 * Release the journal device
457 */
617ba13b 458static int ext4_blkdev_put(struct block_device *bdev)
ac27a0ec
DK		 459{
460 bd_release(bdev);
461 return blkdev_put(bdev);
462}
463
617ba13b 464static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 465{
466 struct block_device *bdev;
467 int ret = -ENODEV;
468
469 bdev = sbi->journal_bdev;
470 if (bdev) {
617ba13b 471 ret = ext4_blkdev_put(bdev);
ac27a0ec
DK		 472 sbi->journal_bdev = NULL;
473 }
474 return ret;
475}
476
477static inline struct inode *orphan_list_entry(struct list_head *l)
478{
617ba13b 479 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 480}
481
617ba13b 482static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 483{
484 struct list_head *l;
485
486 printk(KERN_ERR "sb orphan head is %d\n",
487 le32_to_cpu(sbi->s_es->s_last_orphan));
488
489 printk(KERN_ERR "sb_info orphan list:\n");
490 list_for_each(l, &sbi->s_orphan) {
491 struct inode *inode = orphan_list_entry(l);
492 printk(KERN_ERR " "
493 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
494 inode->i_sb->s_id, inode->i_ino, inode,
495 inode->i_mode, inode->i_nlink,
496 NEXT_ORPHAN(inode));
497 }
498}
499
617ba13b 500static void ext4_put_super (struct super_block * sb)
ac27a0ec 501{
617ba13b
MC		 502 struct ext4_sb_info *sbi = EXT4_SB(sb);
503 struct ext4_super_block *es = sbi->s_es;
ac27a0ec
DK		 504 int i;
505
a86c6181 506 ext4_ext_release(sb);
617ba13b 507 ext4_xattr_put_super(sb);
dab291af 508 jbd2_journal_destroy(sbi->s_journal);
ac27a0ec 509 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 510 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec
DK		 511 es->s_state = cpu_to_le16(sbi->s_mount_state);
512 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
513 mark_buffer_dirty(sbi->s_sbh);
617ba13b 514 ext4_commit_super(sb, es, 1);
ac27a0ec
DK		 515 }
516
517 for (i = 0; i < sbi->s_gdb_count; i++)
518 brelse(sbi->s_group_desc[i]);
519 kfree(sbi->s_group_desc);
520 percpu_counter_destroy(&sbi->s_freeblocks_counter);
521 percpu_counter_destroy(&sbi->s_freeinodes_counter);
522 percpu_counter_destroy(&sbi->s_dirs_counter);
523 brelse(sbi->s_sbh);
524#ifdef CONFIG_QUOTA
525 for (i = 0; i < MAXQUOTAS; i++)
526 kfree(sbi->s_qf_names[i]);
527#endif
528
529 /* Debugging code just in case the in-memory inode orphan list
530 * isn't empty. The on-disk one can be non-empty if we've
531 * detected an error and taken the fs readonly, but the
532 * in-memory list had better be clean by this point. */
533 if (!list_empty(&sbi->s_orphan))
534 dump_orphan_list(sb, sbi);
535 J_ASSERT(list_empty(&sbi->s_orphan));
536
f98393a6 537 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 538 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
539 /*
540 * Invalidate the journal device's buffers. We don't want them
541 * floating about in memory - the physical journal device may
542 * hotswapped, and it breaks the `ro-after' testing code.
543 */
544 sync_blockdev(sbi->journal_bdev);
f98393a6 545 invalidate_bdev(sbi->journal_bdev);
617ba13b 546 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 547 }
548 sb->s_fs_info = NULL;
549 kfree(sbi);
550 return;
551}
552
e18b890b 553static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 554
555/*
556 * Called inside transaction, so use GFP_NOFS
557 */
617ba13b 558static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 559{
617ba13b 560 struct ext4_inode_info *ei;
ac27a0ec 561
e6b4f8da 562 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 563 if (!ei)
564 return NULL;
617ba13b
MC		 565#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
566 ei->i_acl = EXT4_ACL_NOT_CACHED;
567 ei->i_default_acl = EXT4_ACL_NOT_CACHED;
ac27a0ec
DK		 568#endif
569 ei->i_block_alloc_info = NULL;
570 ei->vfs_inode.i_version = 1;
a86c6181 571 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
ac27a0ec
DK		 572 return &ei->vfs_inode;
573}
574
617ba13b 575static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 576{
9f7dd93d
VA		 577 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
578 printk("EXT4 Inode %p: orphan list check failed!\n",
579 EXT4_I(inode));
580 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
581 EXT4_I(inode), sizeof(struct ext4_inode_info),
582 true);
583 dump_stack();
584 }
617ba13b 585 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
ac27a0ec
DK		 586}
587
4ba9b9d0 588static void init_once(struct kmem_cache *cachep, void *foo)
ac27a0ec 589{
617ba13b 590 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 591
a35afb83 592 INIT_LIST_HEAD(&ei->i_orphan);
617ba13b 593#ifdef CONFIG_EXT4DEV_FS_XATTR
a35afb83 594 init_rwsem(&ei->xattr_sem);
ac27a0ec 595#endif
0e855ac8 596 init_rwsem(&ei->i_data_sem);
a35afb83 597 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 598}
599
600static int init_inodecache(void)
601{
617ba13b
MC		 602 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
603 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 604 0, (SLAB_RECLAIM_ACCOUNT|
605 SLAB_MEM_SPREAD),
20c2df83 606 init_once);
617ba13b 607 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 608 return -ENOMEM;
609 return 0;
610}
611
612static void destroy_inodecache(void)
613{
617ba13b 614 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 615}
616
617ba13b 617static void ext4_clear_inode(struct inode *inode)
ac27a0ec 618{
617ba13b
MC		 619 struct ext4_block_alloc_info *rsv = EXT4_I(inode)->i_block_alloc_info;
620#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
621 if (EXT4_I(inode)->i_acl &&
622 EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) {
623 posix_acl_release(EXT4_I(inode)->i_acl);
624 EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED;
625 }
626 if (EXT4_I(inode)->i_default_acl &&
627 EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) {
628 posix_acl_release(EXT4_I(inode)->i_default_acl);
629 EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED;
ac27a0ec
DK		 630 }
631#endif
617ba13b
MC		 632 ext4_discard_reservation(inode);
633 EXT4_I(inode)->i_block_alloc_info = NULL;
ac27a0ec
DK		 634 if (unlikely(rsv))
635 kfree(rsv);
636}
637
617ba13b 638static inline void ext4_show_quota_options(struct seq_file *seq, struct super_block *sb)
ac27a0ec
DK		 639{
640#if defined(CONFIG_QUOTA)
617ba13b 641 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 642
643 if (sbi->s_jquota_fmt)
644 seq_printf(seq, ",jqfmt=%s",
645 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
646
647 if (sbi->s_qf_names[USRQUOTA])
648 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
649
650 if (sbi->s_qf_names[GRPQUOTA])
651 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
652
617ba13b 653 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
ac27a0ec
DK		 654 seq_puts(seq, ",usrquota");
655
617ba13b 656 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
ac27a0ec
DK		 657 seq_puts(seq, ",grpquota");
658#endif
659}
660
d9c9bef1
MS		 661/*
662 * Show an option if
663 * - it's set to a non-default value OR
664 * - if the per-sb default is different from the global default
665 */
617ba13b 666static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
ac27a0ec
DK		 667{
668 struct super_block *sb = vfs->mnt_sb;
d9c9bef1
MS		 669 struct ext4_sb_info *sbi = EXT4_SB(sb);
670 struct ext4_super_block *es = sbi->s_es;
671 unsigned long def_mount_opts;
672
673 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
674
675 if (sbi->s_sb_block != 1)
676 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
677 if (test_opt(sb, MINIX_DF))
678 seq_puts(seq, ",minixdf");
679 if (test_opt(sb, GRPID))
680 seq_puts(seq, ",grpid");
681 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
682 seq_puts(seq, ",nogrpid");
683 if (sbi->s_resuid != EXT4_DEF_RESUID ||
684 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
685 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
686 }
687 if (sbi->s_resgid != EXT4_DEF_RESGID ||
688 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
689 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
690 }
bb4f397a 691 if (test_opt(sb, ERRORS_RO)) {
d9c9bef1
MS		 692 int def_errors = le16_to_cpu(es->s_errors);
693
694 if (def_errors == EXT4_ERRORS_PANIC ||
bb4f397a
AK		 695 def_errors == EXT4_ERRORS_CONTINUE) {
696 seq_puts(seq, ",errors=remount-ro");
d9c9bef1
MS		 697 }
698 }
bb4f397a
AK		 699 if (test_opt(sb, ERRORS_CONT))
700 seq_puts(seq, ",errors=continue");
d9c9bef1
MS		 701 if (test_opt(sb, ERRORS_PANIC))
702 seq_puts(seq, ",errors=panic");
703 if (test_opt(sb, NO_UID32))
704 seq_puts(seq, ",nouid32");
705 if (test_opt(sb, DEBUG))
706 seq_puts(seq, ",debug");
707 if (test_opt(sb, OLDALLOC))
708 seq_puts(seq, ",oldalloc");
07620f69 709#ifdef CONFIG_EXT4DEV_FS_XATTR
d9c9bef1
MS		 710 if (test_opt(sb, XATTR_USER))
711 seq_puts(seq, ",user_xattr");
712 if (!test_opt(sb, XATTR_USER) &&
713 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
714 seq_puts(seq, ",nouser_xattr");
715 }
716#endif
07620f69 717#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
d9c9bef1
MS		 718 if (test_opt(sb, POSIX_ACL))
719 seq_puts(seq, ",acl");
720 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
721 seq_puts(seq, ",noacl");
722#endif
723 if (!test_opt(sb, RESERVATION))
724 seq_puts(seq, ",noreservation");
725 if (sbi->s_commit_interval) {
726 seq_printf(seq, ",commit=%u",
727 (unsigned) (sbi->s_commit_interval / HZ));
728 }
729 if (test_opt(sb, BARRIER))
730 seq_puts(seq, ",barrier=1");
731 if (test_opt(sb, NOBH))
732 seq_puts(seq, ",nobh");
733 if (!test_opt(sb, EXTENTS))
734 seq_puts(seq, ",noextents");
25ec56b5
JNC		 735 if (test_opt(sb, I_VERSION))
736 seq_puts(seq, ",i_version");
ac27a0ec 737
617ba13b 738 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
ac27a0ec 739 seq_puts(seq, ",data=journal");
617ba13b 740 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
ac27a0ec 741 seq_puts(seq, ",data=ordered");
617ba13b 742 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
ac27a0ec
DK		 743 seq_puts(seq, ",data=writeback");
744
617ba13b 745 ext4_show_quota_options(seq, sb);
ac27a0ec
DK		 746
747 return 0;
748}
749
750
1b961ac0
CH		 751static struct inode *ext4_nfs_get_inode(struct super_block *sb,
752 u64 ino, u32 generation)
ac27a0ec 753{
ac27a0ec 754 struct inode *inode;
ac27a0ec 755
617ba13b 756 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 757 return ERR_PTR(-ESTALE);
617ba13b 758 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 759 return ERR_PTR(-ESTALE);
760
761 /* iget isn't really right if the inode is currently unallocated!!
762 *
617ba13b 763 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 764 * deleted, so we should be safe.
765 *
766 * Currently we don't know the generation for parent directory, so
767 * a generation of 0 means "accept any"
768 */
769 inode = iget(sb, ino);
770 if (inode == NULL)
771 return ERR_PTR(-ENOMEM);
772 if (is_bad_inode(inode) ||
773 (generation && inode->i_generation != generation)) {
774 iput(inode);
775 return ERR_PTR(-ESTALE);
776 }
1b961ac0
CH		 777
778 return inode;
779}
780
781static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
782 int fh_len, int fh_type)
783{
784 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
785 ext4_nfs_get_inode);
786}
787
788static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
789 int fh_len, int fh_type)
790{
791 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
792 ext4_nfs_get_inode);
ac27a0ec
DK		 793}
794
795#ifdef CONFIG_QUOTA
796#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
797#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
798
617ba13b
MC		 799static int ext4_dquot_initialize(struct inode *inode, int type);
800static int ext4_dquot_drop(struct inode *inode);
801static int ext4_write_dquot(struct dquot *dquot);
802static int ext4_acquire_dquot(struct dquot *dquot);
803static int ext4_release_dquot(struct dquot *dquot);
804static int ext4_mark_dquot_dirty(struct dquot *dquot);
805static int ext4_write_info(struct super_block *sb, int type);
806static int ext4_quota_on(struct super_block *sb, int type, int format_id, char *path);
807static int ext4_quota_on_mount(struct super_block *sb, int type);
808static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 809 size_t len, loff_t off);
617ba13b 810static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 811 const char *data, size_t len, loff_t off);
812
617ba13b
MC		 813static struct dquot_operations ext4_quota_operations = {
814 .initialize = ext4_dquot_initialize,
815 .drop = ext4_dquot_drop,
ac27a0ec
DK		 816 .alloc_space = dquot_alloc_space,
817 .alloc_inode = dquot_alloc_inode,
818 .free_space = dquot_free_space,
819 .free_inode = dquot_free_inode,
820 .transfer = dquot_transfer,
617ba13b
MC		 821 .write_dquot = ext4_write_dquot,
822 .acquire_dquot = ext4_acquire_dquot,
823 .release_dquot = ext4_release_dquot,
824 .mark_dirty = ext4_mark_dquot_dirty,
825 .write_info = ext4_write_info
ac27a0ec
DK		 826};
827
617ba13b
MC		 828static struct quotactl_ops ext4_qctl_operations = {
829 .quota_on = ext4_quota_on,
ac27a0ec
DK		 830 .quota_off = vfs_quota_off,
831 .quota_sync = vfs_quota_sync,
832 .get_info = vfs_get_dqinfo,
833 .set_info = vfs_set_dqinfo,
834 .get_dqblk = vfs_get_dqblk,
835 .set_dqblk = vfs_set_dqblk
836};
837#endif
838
ee9b6d61 839static const struct super_operations ext4_sops = {
617ba13b
MC		 840 .alloc_inode = ext4_alloc_inode,
841 .destroy_inode = ext4_destroy_inode,
842 .read_inode = ext4_read_inode,
843 .write_inode = ext4_write_inode,
844 .dirty_inode = ext4_dirty_inode,
845 .delete_inode = ext4_delete_inode,
846 .put_super = ext4_put_super,
847 .write_super = ext4_write_super,
848 .sync_fs = ext4_sync_fs,
849 .write_super_lockfs = ext4_write_super_lockfs,
850 .unlockfs = ext4_unlockfs,
851 .statfs = ext4_statfs,
852 .remount_fs = ext4_remount,
853 .clear_inode = ext4_clear_inode,
854 .show_options = ext4_show_options,
ac27a0ec 855#ifdef CONFIG_QUOTA
617ba13b
MC		 856 .quota_read = ext4_quota_read,
857 .quota_write = ext4_quota_write,
ac27a0ec
DK		 858#endif
859};
860
39655164 861static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 862 .fh_to_dentry = ext4_fh_to_dentry,
863 .fh_to_parent = ext4_fh_to_parent,
617ba13b 864 .get_parent = ext4_get_parent,
ac27a0ec
DK		 865};
866
867enum {
868 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
869 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
870 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
871 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
872 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
873 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
818d276c 874 Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec
DK		 875 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
876 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
877 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
878 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
25ec56b5 879 Opt_grpquota, Opt_extents, Opt_noextents, Opt_i_version,
ac27a0ec
DK		 880};
881
882static match_table_t tokens = {
883 {Opt_bsd_df, "bsddf"},
884 {Opt_minix_df, "minixdf"},
885 {Opt_grpid, "grpid"},
886 {Opt_grpid, "bsdgroups"},
887 {Opt_nogrpid, "nogrpid"},
888 {Opt_nogrpid, "sysvgroups"},
889 {Opt_resgid, "resgid=%u"},
890 {Opt_resuid, "resuid=%u"},
891 {Opt_sb, "sb=%u"},
892 {Opt_err_cont, "errors=continue"},
893 {Opt_err_panic, "errors=panic"},
894 {Opt_err_ro, "errors=remount-ro"},
895 {Opt_nouid32, "nouid32"},
896 {Opt_nocheck, "nocheck"},
897 {Opt_nocheck, "check=none"},
898 {Opt_debug, "debug"},
899 {Opt_oldalloc, "oldalloc"},
900 {Opt_orlov, "orlov"},
901 {Opt_user_xattr, "user_xattr"},
902 {Opt_nouser_xattr, "nouser_xattr"},
903 {Opt_acl, "acl"},
904 {Opt_noacl, "noacl"},
905 {Opt_reservation, "reservation"},
906 {Opt_noreservation, "noreservation"},
907 {Opt_noload, "noload"},
908 {Opt_nobh, "nobh"},
909 {Opt_bh, "bh"},
910 {Opt_commit, "commit=%u"},
911 {Opt_journal_update, "journal=update"},
912 {Opt_journal_inum, "journal=%u"},
913 {Opt_journal_dev, "journal_dev=%u"},
818d276c
GS		 914 {Opt_journal_checksum, "journal_checksum"},
915 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 916 {Opt_abort, "abort"},
917 {Opt_data_journal, "data=journal"},
918 {Opt_data_ordered, "data=ordered"},
919 {Opt_data_writeback, "data=writeback"},
920 {Opt_offusrjquota, "usrjquota="},
921 {Opt_usrjquota, "usrjquota=%s"},
922 {Opt_offgrpjquota, "grpjquota="},
923 {Opt_grpjquota, "grpjquota=%s"},
924 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
925 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
926 {Opt_grpquota, "grpquota"},
927 {Opt_noquota, "noquota"},
928 {Opt_quota, "quota"},
929 {Opt_usrquota, "usrquota"},
930 {Opt_barrier, "barrier=%u"},
a86c6181 931 {Opt_extents, "extents"},
1e2462f9 932 {Opt_noextents, "noextents"},
25ec56b5 933 {Opt_i_version, "i_version"},
ac27a0ec
DK		 934 {Opt_err, NULL},
935 {Opt_resize, "resize"},
936};
937
617ba13b 938static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 939{
617ba13b 940 ext4_fsblk_t sb_block;
ac27a0ec
DK		 941 char *options = (char *) *data;
942
943 if (!options || strncmp(options, "sb=", 3) != 0)
944 return 1; /* Default location */
945 options += 3;
617ba13b 946 /*todo: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 947 sb_block = simple_strtoul(options, &options, 0);
948 if (*options && *options != ',') {
617ba13b 949 printk("EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 950 (char *) *data);
951 return 1;
952 }
953 if (*options == ',')
954 options++;
955 *data = (void *) options;
956 return sb_block;
957}
958
959static int parse_options (char *options, struct super_block *sb,
960 unsigned int *inum, unsigned long *journal_devnum,
617ba13b 961 ext4_fsblk_t *n_blocks_count, int is_remount)
ac27a0ec 962{
617ba13b 963 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 964 char * p;
965 substring_t args[MAX_OPT_ARGS];
966 int data_opt = 0;
967 int option;
968#ifdef CONFIG_QUOTA
969 int qtype;
970 char *qname;
971#endif
972
973 if (!options)
974 return 1;
975
976 while ((p = strsep (&options, ",")) != NULL) {
977 int token;
978 if (!*p)
979 continue;
980
981 token = match_token(p, tokens, args);
982 switch (token) {
983 case Opt_bsd_df:
984 clear_opt (sbi->s_mount_opt, MINIX_DF);
985 break;
986 case Opt_minix_df:
987 set_opt (sbi->s_mount_opt, MINIX_DF);
988 break;
989 case Opt_grpid:
990 set_opt (sbi->s_mount_opt, GRPID);
991 break;
992 case Opt_nogrpid:
993 clear_opt (sbi->s_mount_opt, GRPID);
994 break;
995 case Opt_resuid:
996 if (match_int(&args[0], &option))
997 return 0;
998 sbi->s_resuid = option;
999 break;
1000 case Opt_resgid:
1001 if (match_int(&args[0], &option))
1002 return 0;
1003 sbi->s_resgid = option;
1004 break;
1005 case Opt_sb:
1006 /* handled by get_sb_block() instead of here */
1007 /* *sb_block = match_int(&args[0]); */
1008 break;
1009 case Opt_err_panic:
1010 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1011 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1012 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
1013 break;
1014 case Opt_err_ro:
1015 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1016 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1017 set_opt (sbi->s_mount_opt, ERRORS_RO);
1018 break;
1019 case Opt_err_cont:
1020 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1021 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1022 set_opt (sbi->s_mount_opt, ERRORS_CONT);
1023 break;
1024 case Opt_nouid32:
1025 set_opt (sbi->s_mount_opt, NO_UID32);
1026 break;
1027 case Opt_nocheck:
1028 clear_opt (sbi->s_mount_opt, CHECK);
1029 break;
1030 case Opt_debug:
1031 set_opt (sbi->s_mount_opt, DEBUG);
1032 break;
1033 case Opt_oldalloc:
1034 set_opt (sbi->s_mount_opt, OLDALLOC);
1035 break;
1036 case Opt_orlov:
1037 clear_opt (sbi->s_mount_opt, OLDALLOC);
1038 break;
617ba13b 1039#ifdef CONFIG_EXT4DEV_FS_XATTR
ac27a0ec
DK		 1040 case Opt_user_xattr:
1041 set_opt (sbi->s_mount_opt, XATTR_USER);
1042 break;
1043 case Opt_nouser_xattr:
1044 clear_opt (sbi->s_mount_opt, XATTR_USER);
1045 break;
1046#else
1047 case Opt_user_xattr:
1048 case Opt_nouser_xattr:
617ba13b 1049 printk("EXT4 (no)user_xattr options not supported\n");
ac27a0ec
DK		 1050 break;
1051#endif
617ba13b 1052#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
ac27a0ec
DK		 1053 case Opt_acl:
1054 set_opt(sbi->s_mount_opt, POSIX_ACL);
1055 break;
1056 case Opt_noacl:
1057 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1058 break;
1059#else
1060 case Opt_acl:
1061 case Opt_noacl:
617ba13b 1062 printk("EXT4 (no)acl options not supported\n");
ac27a0ec
DK		 1063 break;
1064#endif
1065 case Opt_reservation:
1066 set_opt(sbi->s_mount_opt, RESERVATION);
1067 break;
1068 case Opt_noreservation:
1069 clear_opt(sbi->s_mount_opt, RESERVATION);
1070 break;
1071 case Opt_journal_update:
1072 /* @@@ FIXME */
1073 /* Eventually we will want to be able to create
1074 a journal file here. For now, only allow the
1075 user to specify an existing inode to be the
1076 journal file. */
1077 if (is_remount) {
617ba13b 1078 printk(KERN_ERR "EXT4-fs: cannot specify "
ac27a0ec
DK		 1079 "journal on remount\n");
1080 return 0;
1081 }
1082 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1083 break;
1084 case Opt_journal_inum:
1085 if (is_remount) {
617ba13b 1086 printk(KERN_ERR "EXT4-fs: cannot specify "
ac27a0ec
DK		 1087 "journal on remount\n");
1088 return 0;
1089 }
1090 if (match_int(&args[0], &option))
1091 return 0;
1092 *inum = option;
1093 break;
1094 case Opt_journal_dev:
1095 if (is_remount) {
617ba13b 1096 printk(KERN_ERR "EXT4-fs: cannot specify "
ac27a0ec
DK		 1097 "journal on remount\n");
1098 return 0;
1099 }
1100 if (match_int(&args[0], &option))
1101 return 0;
1102 *journal_devnum = option;
1103 break;
818d276c
GS		 1104 case Opt_journal_checksum:
1105 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1106 break;
1107 case Opt_journal_async_commit:
1108 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
1109 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1110 break;
ac27a0ec
DK		 1111 case Opt_noload:
1112 set_opt (sbi->s_mount_opt, NOLOAD);
1113 break;
1114 case Opt_commit:
1115 if (match_int(&args[0], &option))
1116 return 0;
1117 if (option < 0)
1118 return 0;
1119 if (option == 0)
cd02ff0b 1120 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
ac27a0ec
DK		 1121 sbi->s_commit_interval = HZ * option;
1122 break;
1123 case Opt_data_journal:
617ba13b 1124 data_opt = EXT4_MOUNT_JOURNAL_DATA;
ac27a0ec
DK		 1125 goto datacheck;
1126 case Opt_data_ordered:
617ba13b 1127 data_opt = EXT4_MOUNT_ORDERED_DATA;
ac27a0ec
DK		 1128 goto datacheck;
1129 case Opt_data_writeback:
617ba13b 1130 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
ac27a0ec
DK		 1131 datacheck:
1132 if (is_remount) {
617ba13b 1133 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
ac27a0ec
DK		 1134 != data_opt) {
1135 printk(KERN_ERR
617ba13b 1136 "EXT4-fs: cannot change data "
ac27a0ec
DK		 1137 "mode on remount\n");
1138 return 0;
1139 }
1140 } else {
617ba13b 1141 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
ac27a0ec
DK		 1142 sbi->s_mount_opt |= data_opt;
1143 }
1144 break;
1145#ifdef CONFIG_QUOTA
1146 case Opt_usrjquota:
1147 qtype = USRQUOTA;
1148 goto set_qf_name;
1149 case Opt_grpjquota:
1150 qtype = GRPQUOTA;
1151set_qf_name:
1152 if (sb_any_quota_enabled(sb)) {
1153 printk(KERN_ERR
617ba13b 1154 "EXT4-fs: Cannot change journalled "
ac27a0ec
DK		 1155 "quota options when quota turned on.\n");
1156 return 0;
1157 }
1158 qname = match_strdup(&args[0]);
1159 if (!qname) {
1160 printk(KERN_ERR
617ba13b 1161 "EXT4-fs: not enough memory for "
ac27a0ec
DK		 1162 "storing quotafile name.\n");
1163 return 0;
1164 }
1165 if (sbi->s_qf_names[qtype] &&
1166 strcmp(sbi->s_qf_names[qtype], qname)) {
1167 printk(KERN_ERR
617ba13b 1168 "EXT4-fs: %s quota file already "
ac27a0ec
DK		 1169 "specified.\n", QTYPE2NAME(qtype));
1170 kfree(qname);
1171 return 0;
1172 }
1173 sbi->s_qf_names[qtype] = qname;
1174 if (strchr(sbi->s_qf_names[qtype], '/')) {
1175 printk(KERN_ERR
617ba13b 1176 "EXT4-fs: quotafile must be on "
ac27a0ec
DK		 1177 "filesystem root.\n");
1178 kfree(sbi->s_qf_names[qtype]);
1179 sbi->s_qf_names[qtype] = NULL;
1180 return 0;
1181 }
1182 set_opt(sbi->s_mount_opt, QUOTA);
1183 break;
1184 case Opt_offusrjquota:
1185 qtype = USRQUOTA;
1186 goto clear_qf_name;
1187 case Opt_offgrpjquota:
1188 qtype = GRPQUOTA;
1189clear_qf_name:
1190 if (sb_any_quota_enabled(sb)) {
617ba13b 1191 printk(KERN_ERR "EXT4-fs: Cannot change "
ac27a0ec
DK		 1192 "journalled quota options when "
1193 "quota turned on.\n");
1194 return 0;
1195 }
1196 /*
1197 * The space will be released later when all options
1198 * are confirmed to be correct
1199 */
1200 sbi->s_qf_names[qtype] = NULL;
1201 break;
1202 case Opt_jqfmt_vfsold:
1203 sbi->s_jquota_fmt = QFMT_VFS_OLD;
1204 break;
1205 case Opt_jqfmt_vfsv0:
1206 sbi->s_jquota_fmt = QFMT_VFS_V0;
1207 break;
1208 case Opt_quota:
1209 case Opt_usrquota:
1210 set_opt(sbi->s_mount_opt, QUOTA);
1211 set_opt(sbi->s_mount_opt, USRQUOTA);
1212 break;
1213 case Opt_grpquota:
1214 set_opt(sbi->s_mount_opt, QUOTA);
1215 set_opt(sbi->s_mount_opt, GRPQUOTA);
1216 break;
1217 case Opt_noquota:
1218 if (sb_any_quota_enabled(sb)) {
617ba13b 1219 printk(KERN_ERR "EXT4-fs: Cannot change quota "
ac27a0ec
DK		 1220 "options when quota turned on.\n");
1221 return 0;
1222 }
1223 clear_opt(sbi->s_mount_opt, QUOTA);
1224 clear_opt(sbi->s_mount_opt, USRQUOTA);
1225 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1226 break;
1227#else
1228 case Opt_quota:
1229 case Opt_usrquota:
1230 case Opt_grpquota:
1231 case Opt_usrjquota:
1232 case Opt_grpjquota:
1233 case Opt_offusrjquota:
1234 case Opt_offgrpjquota:
1235 case Opt_jqfmt_vfsold:
1236 case Opt_jqfmt_vfsv0:
1237 printk(KERN_ERR
617ba13b 1238 "EXT4-fs: journalled quota options not "
ac27a0ec
DK		 1239 "supported.\n");
1240 break;
1241 case Opt_noquota:
1242 break;
1243#endif
1244 case Opt_abort:
1245 set_opt(sbi->s_mount_opt, ABORT);
1246 break;
1247 case Opt_barrier:
1248 if (match_int(&args[0], &option))
1249 return 0;
1250 if (option)
1251 set_opt(sbi->s_mount_opt, BARRIER);
1252 else
1253 clear_opt(sbi->s_mount_opt, BARRIER);
1254 break;
1255 case Opt_ignore:
1256 break;
1257 case Opt_resize:
1258 if (!is_remount) {
617ba13b 1259 printk("EXT4-fs: resize option only available "
ac27a0ec
DK		 1260 "for remount\n");
1261 return 0;
1262 }
1263 if (match_int(&args[0], &option) != 0)
1264 return 0;
1265 *n_blocks_count = option;
1266 break;
1267 case Opt_nobh:
1268 set_opt(sbi->s_mount_opt, NOBH);
1269 break;
1270 case Opt_bh:
1271 clear_opt(sbi->s_mount_opt, NOBH);
1272 break;
a86c6181
AT		 1273 case Opt_extents:
1274 set_opt (sbi->s_mount_opt, EXTENTS);
1275 break;
1e2462f9
MC		 1276 case Opt_noextents:
1277 clear_opt (sbi->s_mount_opt, EXTENTS);
1278 break;
25ec56b5
JNC		 1279 case Opt_i_version:
1280 set_opt(sbi->s_mount_opt, I_VERSION);
1281 sb->s_flags |= MS_I_VERSION;
1282 break;
ac27a0ec
DK		 1283 default:
1284 printk (KERN_ERR
617ba13b 1285 "EXT4-fs: Unrecognized mount option \"%s\" "
ac27a0ec
DK		 1286 "or missing value\n", p);
1287 return 0;
1288 }
1289 }
1290#ifdef CONFIG_QUOTA
1291 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
617ba13b 1292 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
ac27a0ec
DK		 1293 sbi->s_qf_names[USRQUOTA])
1294 clear_opt(sbi->s_mount_opt, USRQUOTA);
1295
617ba13b 1296 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
ac27a0ec
DK		 1297 sbi->s_qf_names[GRPQUOTA])
1298 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1299
1300 if ((sbi->s_qf_names[USRQUOTA] &&
617ba13b 1301 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
ac27a0ec 1302 (sbi->s_qf_names[GRPQUOTA] &&
617ba13b
MC		 1303 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
1304 printk(KERN_ERR "EXT4-fs: old and new quota "
ac27a0ec
DK		 1305 "format mixing.\n");
1306 return 0;
1307 }
1308
1309 if (!sbi->s_jquota_fmt) {
617ba13b 1310 printk(KERN_ERR "EXT4-fs: journalled quota format "
ac27a0ec
DK		 1311 "not specified.\n");
1312 return 0;
1313 }
1314 } else {
1315 if (sbi->s_jquota_fmt) {
617ba13b 1316 printk(KERN_ERR "EXT4-fs: journalled quota format "
ac27a0ec
DK		 1317 "specified with no journalling "
1318 "enabled.\n");
1319 return 0;
1320 }
1321 }
1322#endif
1323 return 1;
1324}
1325
617ba13b 1326static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1327 int read_only)
1328{
617ba13b 1329 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1330 int res = 0;
1331
617ba13b
MC		 1332 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1333 printk (KERN_ERR "EXT4-fs warning: revision level too high, "
ac27a0ec
DK		 1334 "forcing read-only mode\n");
1335 res = MS_RDONLY;
1336 }
1337 if (read_only)
1338 return res;
617ba13b
MC		 1339 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1340 printk (KERN_WARNING "EXT4-fs warning: mounting unchecked fs, "
ac27a0ec 1341 "running e2fsck is recommended\n");
617ba13b 1342 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
ac27a0ec 1343 printk (KERN_WARNING
617ba13b 1344 "EXT4-fs warning: mounting fs with errors, "
ac27a0ec
DK		 1345 "running e2fsck is recommended\n");
1346 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1347 le16_to_cpu(es->s_mnt_count) >=
1348 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1349 printk (KERN_WARNING
617ba13b 1350 "EXT4-fs warning: maximal mount count reached, "
ac27a0ec
DK		 1351 "running e2fsck is recommended\n");
1352 else if (le32_to_cpu(es->s_checkinterval) &&
1353 (le32_to_cpu(es->s_lastcheck) +
1354 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1355 printk (KERN_WARNING
617ba13b 1356 "EXT4-fs warning: checktime reached, "
ac27a0ec
DK		 1357 "running e2fsck is recommended\n");
1358#if 0
1359 /* @@@ We _will_ want to clear the valid bit if we find
63f57933
AM		 1360 * inconsistencies, to force a fsck at reboot. But for
1361 * a plain journaled filesystem we can keep it set as
1362 * valid forever! :)
1363 */
617ba13b 1364 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT4_VALID_FS);
ac27a0ec
DK		 1365#endif
1366 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1367 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
ac27a0ec
DK		 1368 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
1369 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b
MC		 1370 ext4_update_dynamic_rev(sb);
1371 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1372
617ba13b 1373 ext4_commit_super(sb, es, 1);
ac27a0ec 1374 if (test_opt(sb, DEBUG))
617ba13b 1375 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, "
ac27a0ec
DK		 1376 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1377 sb->s_blocksize,
1378 sbi->s_groups_count,
617ba13b
MC		 1379 EXT4_BLOCKS_PER_GROUP(sb),
1380 EXT4_INODES_PER_GROUP(sb),
ac27a0ec
DK		 1381 sbi->s_mount_opt);
1382
617ba13b
MC		 1383 printk(KERN_INFO "EXT4 FS on %s, ", sb->s_id);
1384 if (EXT4_SB(sb)->s_journal->j_inode == NULL) {
ac27a0ec
DK		 1385 char b[BDEVNAME_SIZE];
1386
1387 printk("external journal on %s\n",
617ba13b 1388 bdevname(EXT4_SB(sb)->s_journal->j_dev, b));
ac27a0ec
DK		 1389 } else {
1390 printk("internal journal\n");
1391 }
1392 return res;
1393}
1394
717d50e4
AD		 1395__le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1396 struct ext4_group_desc *gdp)
1397{
1398 __u16 crc = 0;
1399
1400 if (sbi->s_es->s_feature_ro_compat &
1401 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1402 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1403 __le32 le_group = cpu_to_le32(block_group);
1404
1405 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1406 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1407 crc = crc16(crc, (__u8 *)gdp, offset);
1408 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1409 /* for checksum of struct ext4_group_desc do the rest...*/
1410 if ((sbi->s_es->s_feature_incompat &
1411 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1412 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1413 crc = crc16(crc, (__u8 *)gdp + offset,
1414 le16_to_cpu(sbi->s_es->s_desc_size) -
1415 offset);
1416 }
1417
1418 return cpu_to_le16(crc);
1419}
1420
1421int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1422 struct ext4_group_desc *gdp)
1423{
1424 if ((sbi->s_es->s_feature_ro_compat &
1425 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1426 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1427 return 0;
1428
1429 return 1;
1430}
1431
ac27a0ec 1432/* Called at mount-time, super-block is locked */
617ba13b 1433static int ext4_check_descriptors (struct super_block * sb)
ac27a0ec 1434{
617ba13b
MC		 1435 struct ext4_sb_info *sbi = EXT4_SB(sb);
1436 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1437 ext4_fsblk_t last_block;
bd81d8ee
LV		 1438 ext4_fsblk_t block_bitmap;
1439 ext4_fsblk_t inode_bitmap;
1440 ext4_fsblk_t inode_table;
617ba13b 1441 struct ext4_group_desc * gdp = NULL;
ac27a0ec 1442 int desc_block = 0;
ce421581 1443 int flexbg_flag = 0;
fd2d4291 1444 ext4_group_t i;
ac27a0ec 1445
ce421581
JS		 1446 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1447 flexbg_flag = 1;
1448
617ba13b 1449 ext4_debug ("Checking group descriptors");
ac27a0ec
DK		 1450
1451 for (i = 0; i < sbi->s_groups_count; i++)
1452 {
ce421581 1453 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 1454 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 1455 else
1456 last_block = first_block +
617ba13b 1457 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 1458
617ba13b
MC		 1459 if ((i % EXT4_DESC_PER_BLOCK(sb)) == 0)
1460 gdp = (struct ext4_group_desc *)
ac27a0ec 1461 sbi->s_group_desc[desc_block++]->b_data;
8fadc143 1462 block_bitmap = ext4_block_bitmap(sb, gdp);
bd81d8ee 1463 if (block_bitmap < first_block || block_bitmap > last_block)
ac27a0ec 1464 {
617ba13b 1465 ext4_error (sb, "ext4_check_descriptors",
fd2d4291 1466 "Block bitmap for group %lu"
2ae02107 1467 " not in group (block %llu)!",
bd81d8ee 1468 i, block_bitmap);
ac27a0ec
DK		 1469 return 0;
1470 }
8fadc143 1471 inode_bitmap = ext4_inode_bitmap(sb, gdp);
bd81d8ee 1472 if (inode_bitmap < first_block || inode_bitmap > last_block)
ac27a0ec 1473 {
617ba13b 1474 ext4_error (sb, "ext4_check_descriptors",
fd2d4291 1475 "Inode bitmap for group %lu"
2ae02107 1476 " not in group (block %llu)!",
bd81d8ee 1477 i, inode_bitmap);
ac27a0ec
DK		 1478 return 0;
1479 }
8fadc143 1480 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 1481 if (inode_table < first_block ||
780dcdb2 1482 inode_table + sbi->s_itb_per_group - 1 > last_block)
ac27a0ec 1483 {
617ba13b 1484 ext4_error (sb, "ext4_check_descriptors",
fd2d4291 1485 "Inode table for group %lu"
2ae02107 1486 " not in group (block %llu)!",
bd81d8ee 1487 i, inode_table);
ac27a0ec
DK		 1488 return 0;
1489 }
717d50e4
AD		 1490 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
1491 ext4_error(sb, __FUNCTION__,
fd2d4291
AM		 1492 "Checksum for group %lu failed (%u!=%u)\n",
1493 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
1494 gdp)), le16_to_cpu(gdp->bg_checksum));
717d50e4
AD		 1495 return 0;
1496 }
ce421581
JS		 1497 if (!flexbg_flag)
1498 first_block += EXT4_BLOCKS_PER_GROUP(sb);
0d1ee42f
AR		 1499 gdp = (struct ext4_group_desc *)
1500 ((__u8 *)gdp + EXT4_DESC_SIZE(sb));
ac27a0ec
DK		 1501 }
1502
bd81d8ee 1503 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
617ba13b 1504 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 1505 return 1;
1506}
1507
617ba13b 1508/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 1509 * the superblock) which were deleted from all directories, but held open by
1510 * a process at the time of a crash. We walk the list and try to delete these
1511 * inodes at recovery time (only with a read-write filesystem).
1512 *
1513 * In order to keep the orphan inode chain consistent during traversal (in
1514 * case of crash during recovery), we link each inode into the superblock
1515 * orphan list_head and handle it the same way as an inode deletion during
1516 * normal operation (which journals the operations for us).
1517 *
1518 * We only do an iget() and an iput() on each inode, which is very safe if we
1519 * accidentally point at an in-use or already deleted inode. The worst that
1520 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 1521 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 1522 * e2fsck was run on this filesystem, and it must have already done the orphan
1523 * inode cleanup for us, so we can safely abort without any further action.
1524 */
617ba13b
MC		 1525static void ext4_orphan_cleanup (struct super_block * sb,
1526 struct ext4_super_block * es)
ac27a0ec
DK		 1527{
1528 unsigned int s_flags = sb->s_flags;
1529 int nr_orphans = 0, nr_truncates = 0;
1530#ifdef CONFIG_QUOTA
1531 int i;
1532#endif
1533 if (!es->s_last_orphan) {
1534 jbd_debug(4, "no orphan inodes to clean up\n");
1535 return;
1536 }
1537
a8f48a95
ES		 1538 if (bdev_read_only(sb->s_bdev)) {
1539 printk(KERN_ERR "EXT4-fs: write access "
1540 "unavailable, skipping orphan cleanup.\n");
1541 return;
1542 }
1543
617ba13b 1544 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
ac27a0ec
DK		 1545 if (es->s_last_orphan)
1546 jbd_debug(1, "Errors on filesystem, "
1547 "clearing orphan list.\n");
1548 es->s_last_orphan = 0;
1549 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1550 return;
1551 }
1552
1553 if (s_flags & MS_RDONLY) {
617ba13b 1554 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n",
ac27a0ec
DK		 1555 sb->s_id);
1556 sb->s_flags &= ~MS_RDONLY;
1557 }
1558#ifdef CONFIG_QUOTA
1559 /* Needed for iput() to work correctly and not trash data */
1560 sb->s_flags |= MS_ACTIVE;
1561 /* Turn on quotas so that they are updated correctly */
1562 for (i = 0; i < MAXQUOTAS; i++) {
617ba13b
MC		 1563 if (EXT4_SB(sb)->s_qf_names[i]) {
1564 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec
DK		 1565 if (ret < 0)
1566 printk(KERN_ERR
617ba13b 1567 "EXT4-fs: Cannot turn on journalled "
ac27a0ec
DK		 1568 "quota: error %d\n", ret);
1569 }
1570 }
1571#endif
1572
1573 while (es->s_last_orphan) {
1574 struct inode *inode;
1575
1576 if (!(inode =
617ba13b 1577 ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
ac27a0ec
DK		 1578 es->s_last_orphan = 0;
1579 break;
1580 }
1581
617ba13b 1582 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
ac27a0ec
DK		 1583 DQUOT_INIT(inode);
1584 if (inode->i_nlink) {
1585 printk(KERN_DEBUG
1586 "%s: truncating inode %lu to %Ld bytes\n",
1587 __FUNCTION__, inode->i_ino, inode->i_size);
1588 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1589 inode->i_ino, inode->i_size);
617ba13b 1590 ext4_truncate(inode);
ac27a0ec
DK		 1591 nr_truncates++;
1592 } else {
1593 printk(KERN_DEBUG
1594 "%s: deleting unreferenced inode %lu\n",
1595 __FUNCTION__, inode->i_ino);
1596 jbd_debug(2, "deleting unreferenced inode %lu\n",
1597 inode->i_ino);
1598 nr_orphans++;
1599 }
1600 iput(inode); /* The delete magic happens here! */
1601 }
1602
1603#define PLURAL(x) (x), ((x)==1) ? "" : "s"
1604
1605 if (nr_orphans)
617ba13b 1606 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n",
ac27a0ec
DK		 1607 sb->s_id, PLURAL(nr_orphans));
1608 if (nr_truncates)
617ba13b 1609 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n",
ac27a0ec
DK		 1610 sb->s_id, PLURAL(nr_truncates));
1611#ifdef CONFIG_QUOTA
1612 /* Turn quotas off */
1613 for (i = 0; i < MAXQUOTAS; i++) {
1614 if (sb_dqopt(sb)->files[i])
1615 vfs_quota_off(sb, i);
1616 }
1617#endif
1618 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1619}
cd2291a4
ES		 1620/*
1621 * Maximal extent format file size.
1622 * Resulting logical blkno at s_maxbytes must fit in our on-disk
1623 * extent format containers, within a sector_t, and within i_blocks
1624 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
1625 * so that won't be a limiting factor.
1626 *
1627 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1628 */
1629static loff_t ext4_max_size(int blkbits)
1630{
1631 loff_t res;
1632 loff_t upper_limit = MAX_LFS_FILESIZE;
1633
1634 /* small i_blocks in vfs inode? */
1635 if (sizeof(blkcnt_t) < sizeof(u64)) {
1636 /*
1637 * CONFIG_LSF is not enabled implies the inode
1638 * i_block represent total blocks in 512 bytes
1639 * 32 == size of vfs inode i_blocks * 8
1640 */
1641 upper_limit = (1LL << 32) - 1;
1642
1643 /* total blocks in file system block size */
1644 upper_limit >>= (blkbits - 9);
1645 upper_limit <<= blkbits;
1646 }
1647
1648 /* 32-bit extent-start container, ee_block */
1649 res = 1LL << 32;
1650 res <<= blkbits;
1651 res -= 1;
1652
1653 /* Sanity check against vm- & vfs- imposed limits */
1654 if (res > upper_limit)
1655 res = upper_limit;
1656
1657 return res;
1658}
ac27a0ec 1659
ac27a0ec 1660/*
cd2291a4 1661 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 1662 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
1663 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 1664 */
cd2291a4 1665static loff_t ext4_max_bitmap_size(int bits)
ac27a0ec 1666{
617ba13b 1667 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 1668 int meta_blocks;
1669 loff_t upper_limit;
1670 /* This is calculated to be the largest file size for a
cd2291a4 1671 * dense, bitmapped file such that the total number of
ac27a0ec 1672 * sectors in the file, including data and all indirect blocks,
0fc1b451
AK		 1673 * does not exceed 2^48 -1
1674 * __u32 i_blocks_lo and _u16 i_blocks_high representing the
1675 * total number of 512 bytes blocks of the file
1676 */
1677
1678 if (sizeof(blkcnt_t) < sizeof(u64)) {
1679 /*
1680 * CONFIG_LSF is not enabled implies the inode
1681 * i_block represent total blocks in 512 bytes
1682 * 32 == size of vfs inode i_blocks * 8
1683 */
1684 upper_limit = (1LL << 32) - 1;
1685
1686 /* total blocks in file system block size */
1687 upper_limit >>= (bits - 9);
1688
1689 } else {
8180a562
AK		 1690 /*
1691 * We use 48 bit ext4_inode i_blocks
1692 * With EXT4_HUGE_FILE_FL set the i_blocks
1693 * represent total number of blocks in
1694 * file system block size
1695 */
0fc1b451
AK		 1696 upper_limit = (1LL << 48) - 1;
1697
0fc1b451
AK		 1698 }
1699
1700 /* indirect blocks */
1701 meta_blocks = 1;
1702 /* double indirect blocks */
1703 meta_blocks += 1 + (1LL << (bits-2));
1704 /* tripple indirect blocks */
1705 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1706
1707 upper_limit -= meta_blocks;
1708 upper_limit <<= bits;
ac27a0ec
DK		 1709
1710 res += 1LL << (bits-2);
1711 res += 1LL << (2*(bits-2));
1712 res += 1LL << (3*(bits-2));
1713 res <<= bits;
1714 if (res > upper_limit)
1715 res = upper_limit;
0fc1b451
AK		 1716
1717 if (res > MAX_LFS_FILESIZE)
1718 res = MAX_LFS_FILESIZE;
1719
ac27a0ec
DK		 1720 return res;
1721}
1722
617ba13b 1723static ext4_fsblk_t descriptor_loc(struct super_block *sb,
70bbb3e0 1724 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 1725{
617ba13b 1726 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 1727 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 1728 int has_super = 0;
1729
1730 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1731
617ba13b 1732 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 1733 nr < first_meta_bg)
70bbb3e0 1734 return logical_sb_block + nr + 1;
ac27a0ec 1735 bg = sbi->s_desc_per_block * nr;
617ba13b 1736 if (ext4_bg_has_super(sb, bg))
ac27a0ec 1737 has_super = 1;
617ba13b 1738 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 1739}
1740
1741
617ba13b 1742static int ext4_fill_super (struct super_block *sb, void *data, int silent)
1d03ec98
AK		 1743 __releases(kernel_sem)
1744 __acquires(kernel_sem)
1745
ac27a0ec
DK		 1746{
1747 struct buffer_head * bh;
617ba13b
MC		 1748 struct ext4_super_block *es = NULL;
1749 struct ext4_sb_info *sbi;
1750 ext4_fsblk_t block;
1751 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 1752 ext4_fsblk_t logical_sb_block;
ac27a0ec
DK		 1753 unsigned long offset = 0;
1754 unsigned int journal_inum = 0;
1755 unsigned long journal_devnum = 0;
1756 unsigned long def_mount_opts;
1757 struct inode *root;
1758 int blocksize;
1759 int hblock;
1760 int db_count;
1761 int i;
1762 int needs_recovery;
1763 __le32 features;
bd81d8ee 1764 __u64 blocks_count;
833f4077 1765 int err;
ac27a0ec
DK		 1766
1767 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1768 if (!sbi)
1769 return -ENOMEM;
1770 sb->s_fs_info = sbi;
1771 sbi->s_mount_opt = 0;
617ba13b
MC		 1772 sbi->s_resuid = EXT4_DEF_RESUID;
1773 sbi->s_resgid = EXT4_DEF_RESGID;
d9c9bef1 1774 sbi->s_sb_block = sb_block;
ac27a0ec
DK		 1775
1776 unlock_kernel();
1777
617ba13b 1778 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 1779 if (!blocksize) {
617ba13b 1780 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n");
ac27a0ec
DK		 1781 goto out_fail;
1782 }
1783
afc7cbca
TS		 1784 if (!sb_set_blocksize(sb, blocksize)) {
1785 printk(KERN_ERR "EXT4-fs: bad blocksize %d.\n", blocksize);
1786 goto out_fail;
1787 }
1788
ac27a0ec 1789 /*
617ba13b 1790 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 1791 * block sizes. We need to calculate the offset from buffer start.
1792 */
617ba13b 1793 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 1794 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1795 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 1796 } else {
70bbb3e0 1797 logical_sb_block = sb_block;
ac27a0ec
DK		 1798 }
1799
70bbb3e0 1800 if (!(bh = sb_bread(sb, logical_sb_block))) {
617ba13b 1801 printk (KERN_ERR "EXT4-fs: unable to read superblock\n");
ac27a0ec
DK		 1802 goto out_fail;
1803 }
1804 /*
1805 * Note: s_es must be initialized as soon as possible because
617ba13b 1806 * some ext4 macro-instructions depend on its value
ac27a0ec 1807 */
617ba13b 1808 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
ac27a0ec
DK		 1809 sbi->s_es = es;
1810 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 1811 if (sb->s_magic != EXT4_SUPER_MAGIC)
1812 goto cantfind_ext4;
ac27a0ec
DK		 1813
1814 /* Set defaults before we parse the mount options */
1815 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
617ba13b 1816 if (def_mount_opts & EXT4_DEFM_DEBUG)
ac27a0ec 1817 set_opt(sbi->s_mount_opt, DEBUG);
617ba13b 1818 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
ac27a0ec 1819 set_opt(sbi->s_mount_opt, GRPID);
617ba13b 1820 if (def_mount_opts & EXT4_DEFM_UID16)
ac27a0ec 1821 set_opt(sbi->s_mount_opt, NO_UID32);
2e7842b8 1822#ifdef CONFIG_EXT4DEV_FS_XATTR
617ba13b 1823 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
ac27a0ec 1824 set_opt(sbi->s_mount_opt, XATTR_USER);
2e7842b8
HD		 1825#endif
1826#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
617ba13b 1827 if (def_mount_opts & EXT4_DEFM_ACL)
ac27a0ec 1828 set_opt(sbi->s_mount_opt, POSIX_ACL);
2e7842b8 1829#endif
617ba13b
MC		 1830 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
1831 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
1832 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
1833 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
1834 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
1835 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
1836
1837 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
ac27a0ec 1838 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
bb4f397a 1839 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
ceea16bf 1840 set_opt(sbi->s_mount_opt, ERRORS_CONT);
bb4f397a
AK		 1841 else
1842 set_opt(sbi->s_mount_opt, ERRORS_RO);
ac27a0ec
DK		 1843
1844 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1845 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1846
1847 set_opt(sbi->s_mount_opt, RESERVATION);
1848
1e2462f9
MC		 1849 /*
1850 * turn on extents feature by default in ext4 filesystem
1851 * User -o noextents to turn it off
1852 */
1853 set_opt(sbi->s_mount_opt, EXTENTS);
1854
ac27a0ec
DK		 1855 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1856 NULL, 0))
1857 goto failed_mount;
1858
1859 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
617ba13b 1860 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 1861
617ba13b
MC		 1862 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
1863 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
1864 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1865 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
ac27a0ec 1866 printk(KERN_WARNING
617ba13b 1867 "EXT4-fs warning: feature flags set on rev 0 fs, "
ac27a0ec
DK		 1868 "running e2fsck is recommended\n");
1869 /*
1870 * Check feature flags regardless of the revision level, since we
1871 * previously didn't change the revision level when setting the flags,
1872 * so there is a chance incompat flags are set on a rev 0 filesystem.
1873 */
617ba13b 1874 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
ac27a0ec 1875 if (features) {
617ba13b 1876 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of "
ac27a0ec
DK		 1877 "unsupported optional features (%x).\n",
1878 sb->s_id, le32_to_cpu(features));
1879 goto failed_mount;
1880 }
617ba13b 1881 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
ac27a0ec 1882 if (!(sb->s_flags & MS_RDONLY) && features) {
617ba13b 1883 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of "
ac27a0ec
DK		 1884 "unsupported optional features (%x).\n",
1885 sb->s_id, le32_to_cpu(features));
1886 goto failed_mount;
1887 }
0fc1b451
AK		 1888 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
1889 /*
1890 * Large file size enabled file system can only be
1891 * mount if kernel is build with CONFIG_LSF
1892 */
1893 if (sizeof(root->i_blocks) < sizeof(u64) &&
1894 !(sb->s_flags & MS_RDONLY)) {
1895 printk(KERN_ERR "EXT4-fs: %s: Filesystem with huge "
1896 "files cannot be mounted read-write "
1897 "without CONFIG_LSF.\n", sb->s_id);
1898 goto failed_mount;
1899 }
1900 }
ac27a0ec
DK		 1901 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1902
617ba13b
MC		 1903 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
1904 blocksize > EXT4_MAX_BLOCK_SIZE) {
ac27a0ec 1905 printk(KERN_ERR
617ba13b 1906 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
ac27a0ec
DK		 1907 blocksize, sb->s_id);
1908 goto failed_mount;
1909 }
1910
1911 hblock = bdev_hardsect_size(sb->s_bdev);
1912 if (sb->s_blocksize != blocksize) {
1913 /*
1914 * Make sure the blocksize for the filesystem is larger
1915 * than the hardware sectorsize for the machine.
1916 */
1917 if (blocksize < hblock) {
617ba13b 1918 printk(KERN_ERR "EXT4-fs: blocksize %d too small for "
ac27a0ec
DK		 1919 "device blocksize %d.\n", blocksize, hblock);
1920 goto failed_mount;
1921 }
1922
1923 brelse (bh);
1924 sb_set_blocksize(sb, blocksize);
70bbb3e0
AM		 1925 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1926 offset = do_div(logical_sb_block, blocksize);
1927 bh = sb_bread(sb, logical_sb_block);
ac27a0ec
DK		 1928 if (!bh) {
1929 printk(KERN_ERR
617ba13b 1930 "EXT4-fs: Can't read superblock on 2nd try.\n");
ac27a0ec
DK		 1931 goto failed_mount;
1932 }
617ba13b 1933 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
ac27a0ec 1934 sbi->s_es = es;
617ba13b 1935 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
ac27a0ec 1936 printk (KERN_ERR
617ba13b 1937 "EXT4-fs: Magic mismatch, very weird !\n");
ac27a0ec
DK		 1938 goto failed_mount;
1939 }
1940 }
1941
e2b46574 1942 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits);
617ba13b 1943 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits);
ac27a0ec 1944
617ba13b
MC		 1945 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
1946 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
1947 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 1948 } else {
1949 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1950 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 1951 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 1952 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec
DK		 1953 (sbi->s_inode_size > blocksize)) {
1954 printk (KERN_ERR
617ba13b 1955 "EXT4-fs: unsupported inode size: %d\n",
ac27a0ec
DK		 1956 sbi->s_inode_size);
1957 goto failed_mount;
1958 }
ef7f3835
KS		 1959 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
1960 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 1961 }
0d1ee42f
AR		 1962 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
1963 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 1964 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 1965 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 1966 !is_power_of_2(sbi->s_desc_size)) {
0d1ee42f 1967 printk(KERN_ERR
8fadc143 1968 "EXT4-fs: unsupported descriptor size %lu\n",
0d1ee42f
AR		 1969 sbi->s_desc_size);
1970 goto failed_mount;
1971 }
1972 } else
1973 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
ac27a0ec 1974 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 1975 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 1976 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b
MC		 1977 goto cantfind_ext4;
1978 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 1979 if (sbi->s_inodes_per_block == 0)
617ba13b 1980 goto cantfind_ext4;
ac27a0ec
DK		 1981 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1982 sbi->s_inodes_per_block;
0d1ee42f 1983 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 1984 sbi->s_sbh = bh;
1985 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 1986 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
1987 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
ac27a0ec
DK		 1988 for (i=0; i < 4; i++)
1989 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1990 sbi->s_def_hash_version = es->s_def_hash_version;
1991
1992 if (sbi->s_blocks_per_group > blocksize * 8) {
1993 printk (KERN_ERR
617ba13b 1994 "EXT4-fs: #blocks per group too big: %lu\n",
ac27a0ec
DK		 1995 sbi->s_blocks_per_group);
1996 goto failed_mount;
1997 }
ac27a0ec
DK		 1998 if (sbi->s_inodes_per_group > blocksize * 8) {
1999 printk (KERN_ERR
617ba13b 2000 "EXT4-fs: #inodes per group too big: %lu\n",
ac27a0ec
DK		 2001 sbi->s_inodes_per_group);
2002 goto failed_mount;
2003 }
2004
bd81d8ee 2005 if (ext4_blocks_count(es) >
ac27a0ec 2006 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
617ba13b 2007 printk(KERN_ERR "EXT4-fs: filesystem on %s:"
ac27a0ec
DK		 2008 " too large to mount safely\n", sb->s_id);
2009 if (sizeof(sector_t) < 8)
617ba13b 2010 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not "
ac27a0ec
DK		 2011 "enabled\n");
2012 goto failed_mount;
2013 }
2014
617ba13b
MC		 2015 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
2016 goto cantfind_ext4;
e7c95593
ES		 2017
2018 /* ensure blocks_count calculation below doesn't sign-extend */
2019 if (ext4_blocks_count(es) + EXT4_BLOCKS_PER_GROUP(sb) <
2020 le32_to_cpu(es->s_first_data_block) + 1) {
2021 printk(KERN_WARNING "EXT4-fs: bad geometry: block count %llu, "
2022 "first data block %u, blocks per group %lu\n",
2023 ext4_blocks_count(es),
2024 le32_to_cpu(es->s_first_data_block),
2025 EXT4_BLOCKS_PER_GROUP(sb));
2026 goto failed_mount;
2027 }
bd81d8ee
LV		 2028 blocks_count = (ext4_blocks_count(es) -
2029 le32_to_cpu(es->s_first_data_block) +
2030 EXT4_BLOCKS_PER_GROUP(sb) - 1);
2031 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
2032 sbi->s_groups_count = blocks_count;
617ba13b
MC		 2033 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
2034 EXT4_DESC_PER_BLOCK(sb);
ac27a0ec
DK		 2035 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
2036 GFP_KERNEL);
2037 if (sbi->s_group_desc == NULL) {
617ba13b 2038 printk (KERN_ERR "EXT4-fs: not enough memory\n");
ac27a0ec
DK		 2039 goto failed_mount;
2040 }
2041
2042 bgl_lock_init(&sbi->s_blockgroup_lock);
2043
2044 for (i = 0; i < db_count; i++) {
70bbb3e0 2045 block = descriptor_loc(sb, logical_sb_block, i);
ac27a0ec
DK		 2046 sbi->s_group_desc[i] = sb_bread(sb, block);
2047 if (!sbi->s_group_desc[i]) {
617ba13b 2048 printk (KERN_ERR "EXT4-fs: "
ac27a0ec
DK		 2049 "can't read group descriptor %d\n", i);
2050 db_count = i;
2051 goto failed_mount2;
2052 }
2053 }
617ba13b
MC		 2054 if (!ext4_check_descriptors (sb)) {
2055 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
ac27a0ec
DK		 2056 goto failed_mount2;
2057 }
2058 sbi->s_gdb_count = db_count;
2059 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
2060 spin_lock_init(&sbi->s_next_gen_lock);
2061
833f4077
PZ		 2062 err = percpu_counter_init(&sbi->s_freeblocks_counter,
2063 ext4_count_free_blocks(sb));
2064 if (!err) {
2065 err = percpu_counter_init(&sbi->s_freeinodes_counter,
2066 ext4_count_free_inodes(sb));
2067 }
2068 if (!err) {
2069 err = percpu_counter_init(&sbi->s_dirs_counter,
2070 ext4_count_dirs(sb));
2071 }
2072 if (err) {
2073 printk(KERN_ERR "EXT4-fs: insufficient memory\n");
2074 goto failed_mount3;
2075 }
ac27a0ec
DK		 2076
2077 /* per fileystem reservation list head & lock */
2078 spin_lock_init(&sbi->s_rsv_window_lock);
2079 sbi->s_rsv_window_root = RB_ROOT;
2080 /* Add a single, static dummy reservation to the start of the
2081 * reservation window list --- it gives us a placeholder for
2082 * append-at-start-of-list which makes the allocation logic
2083 * _much_ simpler. */
617ba13b
MC		 2084 sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
2085 sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
ac27a0ec
DK		 2086 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
2087 sbi->s_rsv_window_head.rsv_goal_size = 0;
617ba13b 2088 ext4_rsv_window_add(sb, &sbi->s_rsv_window_head);
ac27a0ec
DK		 2089
2090 /*
2091 * set up enough so that it can read an inode
2092 */
617ba13b
MC		 2093 sb->s_op = &ext4_sops;
2094 sb->s_export_op = &ext4_export_ops;
2095 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 2096#ifdef CONFIG_QUOTA
617ba13b
MC		 2097 sb->s_qcop = &ext4_qctl_operations;
2098 sb->dq_op = &ext4_quota_operations;
ac27a0ec
DK		 2099#endif
2100 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
2101
2102 sb->s_root = NULL;
2103
2104 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 2105 EXT4_HAS_INCOMPAT_FEATURE(sb,
2106 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec
DK		 2107
2108 /*
2109 * The first inode we look at is the journal inode. Don't try
2110 * root first: it may be modified in the journal!
2111 */
2112 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 2113 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
2114 if (ext4_load_journal(sb, es, journal_devnum))
ac27a0ec
DK		 2115 goto failed_mount3;
2116 } else if (journal_inum) {
617ba13b 2117 if (ext4_create_journal(sb, es, journal_inum))
ac27a0ec
DK		 2118 goto failed_mount3;
2119 } else {
2120 if (!silent)
2121 printk (KERN_ERR
617ba13b 2122 "ext4: No journal on filesystem on %s\n",
ac27a0ec
DK		 2123 sb->s_id);
2124 goto failed_mount3;
2125 }
2126
eb40a09c
JS		 2127 if (ext4_blocks_count(es) > 0xffffffffULL &&
2128 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
2129 JBD2_FEATURE_INCOMPAT_64BIT)) {
2130 printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n");
2131 goto failed_mount4;
2132 }
2133
818d276c
GS		 2134 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2135 jbd2_journal_set_features(sbi->s_journal,
2136 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2137 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2138 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2139 jbd2_journal_set_features(sbi->s_journal,
2140 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
2141 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2142 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2143 } else {
2144 jbd2_journal_clear_features(sbi->s_journal,
2145 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2146 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2147 }
2148
ac27a0ec
DK		 2149 /* We have now updated the journal if required, so we can
2150 * validate the data journaling mode. */
2151 switch (test_opt(sb, DATA_FLAGS)) {
2152 case 0:
2153 /* No mode set, assume a default based on the journal
63f57933
AM		 2154 * capabilities: ORDERED_DATA if the journal can
2155 * cope, else JOURNAL_DATA
2156 */
dab291af
MC		 2157 if (jbd2_journal_check_available_features
2158 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
ac27a0ec
DK		 2159 set_opt(sbi->s_mount_opt, ORDERED_DATA);
2160 else
2161 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2162 break;
2163
617ba13b
MC		 2164 case EXT4_MOUNT_ORDERED_DATA:
2165 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 2166 if (!jbd2_journal_check_available_features
2167 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
617ba13b 2168 printk(KERN_ERR "EXT4-fs: Journal does not support "
ac27a0ec
DK		 2169 "requested data journaling mode\n");
2170 goto failed_mount4;
2171 }
2172 default:
2173 break;
2174 }
2175
2176 if (test_opt(sb, NOBH)) {
617ba13b
MC		 2177 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
2178 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - "
ac27a0ec
DK		 2179 "its supported only with writeback mode\n");
2180 clear_opt(sbi->s_mount_opt, NOBH);
2181 }
2182 }
2183 /*
dab291af 2184 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 2185 * so we can safely mount the rest of the filesystem now.
2186 */
2187
617ba13b 2188 root = iget(sb, EXT4_ROOT_INO);
ac27a0ec
DK		 2189 sb->s_root = d_alloc_root(root);
2190 if (!sb->s_root) {
617ba13b 2191 printk(KERN_ERR "EXT4-fs: get root inode failed\n");
ac27a0ec
DK		 2192 iput(root);
2193 goto failed_mount4;
2194 }
2195 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
2196 dput(sb->s_root);
2197 sb->s_root = NULL;
617ba13b 2198 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
ac27a0ec
DK		 2199 goto failed_mount4;
2200 }
2201
617ba13b 2202 ext4_setup_super (sb, es, sb->s_flags & MS_RDONLY);
ef7f3835
KS		 2203
2204 /* determine the minimum size of new large inodes, if present */
2205 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
2206 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2207 EXT4_GOOD_OLD_INODE_SIZE;
2208 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2209 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2210 if (sbi->s_want_extra_isize <
2211 le16_to_cpu(es->s_want_extra_isize))
2212 sbi->s_want_extra_isize =
2213 le16_to_cpu(es->s_want_extra_isize);
2214 if (sbi->s_want_extra_isize <
2215 le16_to_cpu(es->s_min_extra_isize))
2216 sbi->s_want_extra_isize =
2217 le16_to_cpu(es->s_min_extra_isize);
2218 }
2219 }
2220 /* Check if enough inode space is available */
2221 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2222 sbi->s_inode_size) {
2223 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2224 EXT4_GOOD_OLD_INODE_SIZE;
2225 printk(KERN_INFO "EXT4-fs: required extra inode space not"
2226 "available.\n");
2227 }
2228
ac27a0ec
DK		 2229 /*
2230 * akpm: core read_super() calls in here with the superblock locked.
2231 * That deadlocks, because orphan cleanup needs to lock the superblock
2232 * in numerous places. Here we just pop the lock - it's relatively
2233 * harmless, because we are now ready to accept write_super() requests,
2234 * and aviro says that's the only reason for hanging onto the
2235 * superblock lock.
2236 */
617ba13b
MC		 2237 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
2238 ext4_orphan_cleanup(sb, es);
2239 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
ac27a0ec 2240 if (needs_recovery)
617ba13b
MC		 2241 printk (KERN_INFO "EXT4-fs: recovery complete.\n");
2242 ext4_mark_recovery_complete(sb, es);
2243 printk (KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n",
2244 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal":
2245 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered":
ac27a0ec
DK		 2246 "writeback");
2247
a86c6181
AT		 2248 ext4_ext_init(sb);
2249
ac27a0ec
DK		 2250 lock_kernel();
2251 return 0;
2252
617ba13b 2253cantfind_ext4:
ac27a0ec 2254 if (!silent)
617ba13b 2255 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n",
ac27a0ec
DK		 2256 sb->s_id);
2257 goto failed_mount;
2258
2259failed_mount4:
dab291af 2260 jbd2_journal_destroy(sbi->s_journal);
ac27a0ec
DK		 2261failed_mount3:
2262 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2263 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2264 percpu_counter_destroy(&sbi->s_dirs_counter);
2265failed_mount2:
2266 for (i = 0; i < db_count; i++)
2267 brelse(sbi->s_group_desc[i]);
2268 kfree(sbi->s_group_desc);
2269failed_mount:
2270#ifdef CONFIG_QUOTA
2271 for (i = 0; i < MAXQUOTAS; i++)
2272 kfree(sbi->s_qf_names[i]);
2273#endif
617ba13b 2274 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 2275 brelse(bh);
2276out_fail:
2277 sb->s_fs_info = NULL;
2278 kfree(sbi);
2279 lock_kernel();
2280 return -EINVAL;
2281}
2282
2283/*
2284 * Setup any per-fs journal parameters now. We'll do this both on
2285 * initial mount, once the journal has been initialised but before we've
2286 * done any recovery; and again on any subsequent remount.
2287 */
617ba13b 2288static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 2289{
617ba13b 2290 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 2291
2292 if (sbi->s_commit_interval)
2293 journal->j_commit_interval = sbi->s_commit_interval;
617ba13b 2294 /* We could also set up an ext4-specific default for the commit
ac27a0ec
DK		 2295 * interval here, but for now we'll just fall back to the jbd
2296 * default. */
2297
2298 spin_lock(&journal->j_state_lock);
2299 if (test_opt(sb, BARRIER))
dab291af 2300 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 2301 else
dab291af 2302 journal->j_flags &= ~JBD2_BARRIER;
ac27a0ec
DK		 2303 spin_unlock(&journal->j_state_lock);
2304}
2305
617ba13b 2306static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 2307 unsigned int journal_inum)
2308{
2309 struct inode *journal_inode;
2310 journal_t *journal;
2311
2312 /* First, test for the existence of a valid inode on disk. Bad
2313 * things happen if we iget() an unused inode, as the subsequent
2314 * iput() will try to delete it. */
2315
2316 journal_inode = iget(sb, journal_inum);
2317 if (!journal_inode) {
617ba13b 2318 printk(KERN_ERR "EXT4-fs: no journal found.\n");
ac27a0ec
DK		 2319 return NULL;
2320 }
2321 if (!journal_inode->i_nlink) {
2322 make_bad_inode(journal_inode);
2323 iput(journal_inode);
617ba13b 2324 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n");
ac27a0ec
DK		 2325 return NULL;
2326 }
2327
2328 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2329 journal_inode, journal_inode->i_size);
2330 if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
617ba13b 2331 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
ac27a0ec
DK		 2332 iput(journal_inode);
2333 return NULL;
2334 }
2335
dab291af 2336 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 2337 if (!journal) {
617ba13b 2338 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n");
ac27a0ec
DK		 2339 iput(journal_inode);
2340 return NULL;
2341 }
2342 journal->j_private = sb;
617ba13b 2343 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 2344 return journal;
2345}
2346
617ba13b 2347static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 2348 dev_t j_dev)
2349{
2350 struct buffer_head * bh;
2351 journal_t *journal;
617ba13b
MC		 2352 ext4_fsblk_t start;
2353 ext4_fsblk_t len;
ac27a0ec 2354 int hblock, blocksize;
617ba13b 2355 ext4_fsblk_t sb_block;
ac27a0ec 2356 unsigned long offset;
617ba13b 2357 struct ext4_super_block * es;
ac27a0ec
DK		 2358 struct block_device *bdev;
2359
617ba13b 2360 bdev = ext4_blkdev_get(j_dev);
ac27a0ec
DK		 2361 if (bdev == NULL)
2362 return NULL;
2363
2364 if (bd_claim(bdev, sb)) {
2365 printk(KERN_ERR
8c55e204 2366 "EXT4: failed to claim external journal device.\n");
ac27a0ec
DK		 2367 blkdev_put(bdev);
2368 return NULL;
2369 }
2370
2371 blocksize = sb->s_blocksize;
2372 hblock = bdev_hardsect_size(bdev);
2373 if (blocksize < hblock) {
2374 printk(KERN_ERR
617ba13b 2375 "EXT4-fs: blocksize too small for journal device.\n");
ac27a0ec
DK		 2376 goto out_bdev;
2377 }
2378
617ba13b
MC		 2379 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
2380 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 2381 set_blocksize(bdev, blocksize);
2382 if (!(bh = __bread(bdev, sb_block, blocksize))) {
617ba13b 2383 printk(KERN_ERR "EXT4-fs: couldn't read superblock of "
ac27a0ec
DK		 2384 "external journal\n");
2385 goto out_bdev;
2386 }
2387
617ba13b
MC		 2388 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2389 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 2390 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b
MC		 2391 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2392 printk(KERN_ERR "EXT4-fs: external journal has "
ac27a0ec
DK		 2393 "bad superblock\n");
2394 brelse(bh);
2395 goto out_bdev;
2396 }
2397
617ba13b
MC		 2398 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2399 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n");
ac27a0ec
DK		 2400 brelse(bh);
2401 goto out_bdev;
2402 }
2403
bd81d8ee 2404 len = ext4_blocks_count(es);
ac27a0ec
DK		 2405 start = sb_block + 1;
2406 brelse(bh); /* we're done with the superblock */
2407
dab291af 2408 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 2409 start, len, blocksize);
2410 if (!journal) {
617ba13b 2411 printk(KERN_ERR "EXT4-fs: failed to create device journal\n");
ac27a0ec
DK		 2412 goto out_bdev;
2413 }
2414 journal->j_private = sb;
2415 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2416 wait_on_buffer(journal->j_sb_buffer);
2417 if (!buffer_uptodate(journal->j_sb_buffer)) {
617ba13b 2418 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n");
ac27a0ec
DK		 2419 goto out_journal;
2420 }
2421 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
617ba13b 2422 printk(KERN_ERR "EXT4-fs: External journal has more than one "
ac27a0ec
DK		 2423 "user (unsupported) - %d\n",
2424 be32_to_cpu(journal->j_superblock->s_nr_users));
2425 goto out_journal;
2426 }
617ba13b
MC		 2427 EXT4_SB(sb)->journal_bdev = bdev;
2428 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 2429 return journal;
2430out_journal:
dab291af 2431 jbd2_journal_destroy(journal);
ac27a0ec 2432out_bdev:
617ba13b 2433 ext4_blkdev_put(bdev);
ac27a0ec
DK		 2434 return NULL;
2435}
2436
617ba13b
MC		 2437static int ext4_load_journal(struct super_block *sb,
2438 struct ext4_super_block *es,
ac27a0ec
DK		 2439 unsigned long journal_devnum)
2440{
2441 journal_t *journal;
2442 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2443 dev_t journal_dev;
2444 int err = 0;
2445 int really_read_only;
2446
2447 if (journal_devnum &&
2448 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
617ba13b 2449 printk(KERN_INFO "EXT4-fs: external journal device major/minor "
ac27a0ec
DK		 2450 "numbers have changed\n");
2451 journal_dev = new_decode_dev(journal_devnum);
2452 } else
2453 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2454
2455 really_read_only = bdev_read_only(sb->s_bdev);
2456
2457 /*
2458 * Are we loading a blank journal or performing recovery after a
2459 * crash? For recovery, we need to check in advance whether we
2460 * can get read-write access to the device.
2461 */
2462
617ba13b 2463 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 2464 if (sb->s_flags & MS_RDONLY) {
617ba13b 2465 printk(KERN_INFO "EXT4-fs: INFO: recovery "
ac27a0ec
DK		 2466 "required on readonly filesystem.\n");
2467 if (really_read_only) {
617ba13b 2468 printk(KERN_ERR "EXT4-fs: write access "
ac27a0ec
DK		 2469 "unavailable, cannot proceed.\n");
2470 return -EROFS;
2471 }
617ba13b 2472 printk (KERN_INFO "EXT4-fs: write access will "
ac27a0ec
DK		 2473 "be enabled during recovery.\n");
2474 }
2475 }
2476
2477 if (journal_inum && journal_dev) {
617ba13b 2478 printk(KERN_ERR "EXT4-fs: filesystem has both journal "
ac27a0ec
DK		 2479 "and inode journals!\n");
2480 return -EINVAL;
2481 }
2482
2483 if (journal_inum) {
617ba13b 2484 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 2485 return -EINVAL;
2486 } else {
617ba13b 2487 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 2488 return -EINVAL;
2489 }
2490
2491 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
dab291af 2492 err = jbd2_journal_update_format(journal);
ac27a0ec 2493 if (err) {
617ba13b 2494 printk(KERN_ERR "EXT4-fs: error updating journal.\n");
dab291af 2495 jbd2_journal_destroy(journal);
ac27a0ec
DK		 2496 return err;
2497 }
2498 }
2499
617ba13b 2500 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 2501 err = jbd2_journal_wipe(journal, !really_read_only);
ac27a0ec 2502 if (!err)
dab291af 2503 err = jbd2_journal_load(journal);
ac27a0ec
DK		 2504
2505 if (err) {
617ba13b 2506 printk(KERN_ERR "EXT4-fs: error loading journal.\n");
dab291af 2507 jbd2_journal_destroy(journal);
ac27a0ec
DK		 2508 return err;
2509 }
2510
617ba13b
MC		 2511 EXT4_SB(sb)->s_journal = journal;
2512 ext4_clear_journal_err(sb, es);
ac27a0ec
DK		 2513
2514 if (journal_devnum &&
2515 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2516 es->s_journal_dev = cpu_to_le32(journal_devnum);
2517 sb->s_dirt = 1;
2518
2519 /* Make sure we flush the recovery flag to disk. */
617ba13b 2520 ext4_commit_super(sb, es, 1);
ac27a0ec
DK		 2521 }
2522
2523 return 0;
2524}
2525
617ba13b
MC		 2526static int ext4_create_journal(struct super_block * sb,
2527 struct ext4_super_block * es,
ac27a0ec
DK		 2528 unsigned int journal_inum)
2529{
2530 journal_t *journal;
6c675bd4 2531 int err;
ac27a0ec
DK		 2532
2533 if (sb->s_flags & MS_RDONLY) {
617ba13b 2534 printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to "
ac27a0ec
DK		 2535 "create journal.\n");
2536 return -EROFS;
2537 }
2538
6c675bd4
BP		 2539 journal = ext4_get_journal(sb, journal_inum);
2540 if (!journal)
ac27a0ec
DK		 2541 return -EINVAL;
2542
617ba13b 2543 printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n",
ac27a0ec
DK		 2544 journal_inum);
2545
6c675bd4
BP		 2546 err = jbd2_journal_create(journal);
2547 if (err) {
617ba13b 2548 printk(KERN_ERR "EXT4-fs: error creating journal.\n");
dab291af 2549 jbd2_journal_destroy(journal);
ac27a0ec
DK		 2550 return -EIO;
2551 }
2552
617ba13b 2553 EXT4_SB(sb)->s_journal = journal;
ac27a0ec 2554
617ba13b
MC		 2555 ext4_update_dynamic_rev(sb);
2556 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2557 EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL);
ac27a0ec
DK		 2558
2559 es->s_journal_inum = cpu_to_le32(journal_inum);
2560 sb->s_dirt = 1;
2561
2562 /* Make sure we flush the recovery flag to disk. */
617ba13b 2563 ext4_commit_super(sb, es, 1);
ac27a0ec
DK		 2564
2565 return 0;
2566}
2567
617ba13b
MC		 2568static void ext4_commit_super (struct super_block * sb,
2569 struct ext4_super_block * es,
ac27a0ec
DK		 2570 int sync)
2571{
617ba13b 2572 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
ac27a0ec
DK		 2573
2574 if (!sbh)
2575 return;
2576 es->s_wtime = cpu_to_le32(get_seconds());
bd81d8ee 2577 ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb));
617ba13b 2578 es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 2579 BUFFER_TRACE(sbh, "marking dirty");
2580 mark_buffer_dirty(sbh);
2581 if (sync)
2582 sync_dirty_buffer(sbh);
2583}
2584
2585
2586/*
2587 * Have we just finished recovery? If so, and if we are mounting (or
2588 * remounting) the filesystem readonly, then we will end up with a
2589 * consistent fs on disk. Record that fact.
2590 */
617ba13b
MC		 2591static void ext4_mark_recovery_complete(struct super_block * sb,
2592 struct ext4_super_block * es)
ac27a0ec 2593{
617ba13b 2594 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 2595
dab291af
MC		 2596 jbd2_journal_lock_updates(journal);
2597 jbd2_journal_flush(journal);
32c37730 2598 lock_super(sb);
617ba13b 2599 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 2600 sb->s_flags & MS_RDONLY) {
617ba13b 2601 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 2602 sb->s_dirt = 0;
617ba13b 2603 ext4_commit_super(sb, es, 1);
ac27a0ec 2604 }
32c37730 2605 unlock_super(sb);
dab291af 2606 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 2607}
2608
2609/*
2610 * If we are mounting (or read-write remounting) a filesystem whose journal
2611 * has recorded an error from a previous lifetime, move that error to the
2612 * main filesystem now.
2613 */
617ba13b
MC		 2614static void ext4_clear_journal_err(struct super_block * sb,
2615 struct ext4_super_block * es)
ac27a0ec
DK		 2616{
2617 journal_t *journal;
2618 int j_errno;
2619 const char *errstr;
2620
617ba13b 2621 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 2622
2623 /*
2624 * Now check for any error status which may have been recorded in the
617ba13b 2625 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 2626 */
2627
dab291af 2628 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 2629 if (j_errno) {
2630 char nbuf[16];
2631
617ba13b
MC		 2632 errstr = ext4_decode_error(sb, j_errno, nbuf);
2633 ext4_warning(sb, __FUNCTION__, "Filesystem error recorded "
ac27a0ec 2634 "from previous mount: %s", errstr);
617ba13b 2635 ext4_warning(sb, __FUNCTION__, "Marking fs in need of "
ac27a0ec
DK		 2636 "filesystem check.");
2637
617ba13b
MC		 2638 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2639 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2640 ext4_commit_super (sb, es, 1);
ac27a0ec 2641
dab291af 2642 jbd2_journal_clear_err(journal);
ac27a0ec
DK		 2643 }
2644}
2645
2646/*
2647 * Force the running and committing transactions to commit,
2648 * and wait on the commit.
2649 */
617ba13b 2650int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 2651{
2652 journal_t *journal;
2653 int ret;
2654
2655 if (sb->s_flags & MS_RDONLY)
2656 return 0;
2657
617ba13b 2658 journal = EXT4_SB(sb)->s_journal;
ac27a0ec 2659 sb->s_dirt = 0;
617ba13b 2660 ret = ext4_journal_force_commit(journal);
ac27a0ec
DK		 2661 return ret;
2662}
2663
2664/*
617ba13b 2665 * Ext4 always journals updates to the superblock itself, so we don't
ac27a0ec
DK		 2666 * have to propagate any other updates to the superblock on disk at this
2667 * point. Just start an async writeback to get the buffers on their way
2668 * to the disk.
2669 *
2670 * This implicitly triggers the writebehind on sync().
2671 */
2672
617ba13b 2673static void ext4_write_super (struct super_block * sb)
ac27a0ec
DK		 2674{
2675 if (mutex_trylock(&sb->s_lock) != 0)
2676 BUG();
2677 sb->s_dirt = 0;
2678}
2679
617ba13b 2680static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec
DK		 2681{
2682 tid_t target;
2683
2684 sb->s_dirt = 0;
dab291af 2685 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) {
ac27a0ec 2686 if (wait)
dab291af 2687 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target);
ac27a0ec
DK		 2688 }
2689 return 0;
2690}
2691
2692/*
2693 * LVM calls this function before a (read-only) snapshot is created. This
2694 * gives us a chance to flush the journal completely and mark the fs clean.
2695 */
617ba13b 2696static void ext4_write_super_lockfs(struct super_block *sb)
ac27a0ec
DK		 2697{
2698 sb->s_dirt = 0;
2699
2700 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 2701 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 2702
2703 /* Now we set up the journal barrier. */
dab291af
MC		 2704 jbd2_journal_lock_updates(journal);
2705 jbd2_journal_flush(journal);
ac27a0ec
DK		 2706
2707 /* Journal blocked and flushed, clear needs_recovery flag. */
617ba13b
MC		 2708 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2709 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
ac27a0ec
DK		 2710 }
2711}
2712
2713/*
2714 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2715 * flag here, even though the filesystem is not technically dirty yet.
2716 */
617ba13b 2717static void ext4_unlockfs(struct super_block *sb)
ac27a0ec
DK		 2718{
2719 if (!(sb->s_flags & MS_RDONLY)) {
2720 lock_super(sb);
2721 /* Reser the needs_recovery flag before the fs is unlocked. */
617ba13b
MC		 2722 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2723 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
ac27a0ec 2724 unlock_super(sb);
dab291af 2725 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
ac27a0ec
DK		 2726 }
2727}
2728
617ba13b 2729static int ext4_remount (struct super_block * sb, int * flags, char * data)
ac27a0ec 2730{
617ba13b
MC		 2731 struct ext4_super_block * es;
2732 struct ext4_sb_info *sbi = EXT4_SB(sb);
2733 ext4_fsblk_t n_blocks_count = 0;
ac27a0ec 2734 unsigned long old_sb_flags;
617ba13b 2735 struct ext4_mount_options old_opts;
ac27a0ec
DK		 2736 int err;
2737#ifdef CONFIG_QUOTA
2738 int i;
2739#endif
2740
2741 /* Store the original options */
2742 old_sb_flags = sb->s_flags;
2743 old_opts.s_mount_opt = sbi->s_mount_opt;
2744 old_opts.s_resuid = sbi->s_resuid;
2745 old_opts.s_resgid = sbi->s_resgid;
2746 old_opts.s_commit_interval = sbi->s_commit_interval;
2747#ifdef CONFIG_QUOTA
2748 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2749 for (i = 0; i < MAXQUOTAS; i++)
2750 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2751#endif
2752
2753 /*
2754 * Allow the "check" option to be passed as a remount option.
2755 */
2756 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2757 err = -EINVAL;
2758 goto restore_opts;
2759 }
2760
617ba13b
MC		 2761 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT)
2762 ext4_abort(sb, __FUNCTION__, "Abort forced by user");
ac27a0ec
DK		 2763
2764 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
617ba13b 2765 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 2766
2767 es = sbi->s_es;
2768
617ba13b 2769 ext4_init_journal_params(sb, sbi->s_journal);
ac27a0ec
DK		 2770
2771 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
bd81d8ee 2772 n_blocks_count > ext4_blocks_count(es)) {
617ba13b 2773 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
ac27a0ec
DK		 2774 err = -EROFS;
2775 goto restore_opts;
2776 }
2777
2778 if (*flags & MS_RDONLY) {
2779 /*
2780 * First of all, the unconditional stuff we have to do
2781 * to disable replay of the journal when we next remount
2782 */
2783 sb->s_flags |= MS_RDONLY;
2784
2785 /*
2786 * OK, test if we are remounting a valid rw partition
2787 * readonly, and if so set the rdonly flag and then
2788 * mark the partition as valid again.
2789 */
617ba13b
MC		 2790 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
2791 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 2792 es->s_state = cpu_to_le16(sbi->s_mount_state);
2793
32c37730
JK		 2794 /*
2795 * We have to unlock super so that we can wait for
2796 * transactions.
2797 */
2798 unlock_super(sb);
617ba13b 2799 ext4_mark_recovery_complete(sb, es);
32c37730 2800 lock_super(sb);
ac27a0ec
DK		 2801 } else {
2802 __le32 ret;
617ba13b
MC		 2803 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
2804 ~EXT4_FEATURE_RO_COMPAT_SUPP))) {
2805 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
ac27a0ec
DK		 2806 "remount RDWR because of unsupported "
2807 "optional features (%x).\n",
2808 sb->s_id, le32_to_cpu(ret));
2809 err = -EROFS;
2810 goto restore_opts;
2811 }
ead6596b
ES		 2812
2813 /*
2814 * If we have an unprocessed orphan list hanging
2815 * around from a previously readonly bdev mount,
2816 * require a full umount/remount for now.
2817 */
2818 if (es->s_last_orphan) {
2819 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
2820 "remount RDWR because of unprocessed "
2821 "orphan inode list. Please "
2822 "umount/remount instead.\n",
2823 sb->s_id);
2824 err = -EINVAL;
2825 goto restore_opts;
2826 }
2827
ac27a0ec
DK		 2828 /*
2829 * Mounting a RDONLY partition read-write, so reread
2830 * and store the current valid flag. (It may have
2831 * been changed by e2fsck since we originally mounted
2832 * the partition.)
2833 */
617ba13b 2834 ext4_clear_journal_err(sb, es);
ac27a0ec 2835 sbi->s_mount_state = le16_to_cpu(es->s_state);
617ba13b 2836 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
ac27a0ec 2837 goto restore_opts;
617ba13b 2838 if (!ext4_setup_super (sb, es, 0))
ac27a0ec
DK		 2839 sb->s_flags &= ~MS_RDONLY;
2840 }
2841 }
2842#ifdef CONFIG_QUOTA
2843 /* Release old quota file names */
2844 for (i = 0; i < MAXQUOTAS; i++)
2845 if (old_opts.s_qf_names[i] &&
2846 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2847 kfree(old_opts.s_qf_names[i]);
2848#endif
2849 return 0;
2850restore_opts:
2851 sb->s_flags = old_sb_flags;
2852 sbi->s_mount_opt = old_opts.s_mount_opt;
2853 sbi->s_resuid = old_opts.s_resuid;
2854 sbi->s_resgid = old_opts.s_resgid;
2855 sbi->s_commit_interval = old_opts.s_commit_interval;
2856#ifdef CONFIG_QUOTA
2857 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2858 for (i = 0; i < MAXQUOTAS; i++) {
2859 if (sbi->s_qf_names[i] &&
2860 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2861 kfree(sbi->s_qf_names[i]);
2862 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2863 }
2864#endif
2865 return err;
2866}
2867
617ba13b 2868static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf)
ac27a0ec
DK		 2869{
2870 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 2871 struct ext4_sb_info *sbi = EXT4_SB(sb);
2872 struct ext4_super_block *es = sbi->s_es;
960cc398 2873 u64 fsid;
ac27a0ec 2874
5e70030d
BP		 2875 if (test_opt(sb, MINIX_DF)) {
2876 sbi->s_overhead_last = 0;
6bc9feff 2877 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
fd2d4291 2878 ext4_group_t ngroups = sbi->s_groups_count, i;
5e70030d 2879 ext4_fsblk_t overhead = 0;
ac27a0ec
DK		 2880 smp_rmb();
2881
2882 /*
5e70030d
BP		 2883 * Compute the overhead (FS structures). This is constant
2884 * for a given filesystem unless the number of block groups
2885 * changes so we cache the previous value until it does.
ac27a0ec
DK		 2886 */
2887
2888 /*
2889 * All of the blocks before first_data_block are
2890 * overhead
2891 */
2892 overhead = le32_to_cpu(es->s_first_data_block);
2893
2894 /*
2895 * Add the overhead attributed to the superblock and
2896 * block group descriptors. If the sparse superblocks
2897 * feature is turned on, then not all groups have this.
2898 */
2899 for (i = 0; i < ngroups; i++) {
617ba13b
MC		 2900 overhead += ext4_bg_has_super(sb, i) +
2901 ext4_bg_num_gdb(sb, i);
ac27a0ec
DK		 2902 cond_resched();
2903 }
2904
2905 /*
2906 * Every block group has an inode bitmap, a block
2907 * bitmap, and an inode table.
2908 */
5e70030d
BP		 2909 overhead += ngroups * (2 + sbi->s_itb_per_group);
2910 sbi->s_overhead_last = overhead;
2911 smp_wmb();
6bc9feff 2912 sbi->s_blocks_last = ext4_blocks_count(es);
ac27a0ec
DK		 2913 }
2914
617ba13b 2915 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 2916 buf->f_bsize = sb->s_blocksize;
5e70030d 2917 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
52d9f3b4 2918 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
308ba3ec 2919 ext4_free_blocks_count_set(es, buf->f_bfree);
bd81d8ee
LV		 2920 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
2921 if (buf->f_bfree < ext4_r_blocks_count(es))
ac27a0ec
DK		 2922 buf->f_bavail = 0;
2923 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 2924 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
5e70030d 2925 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
617ba13b 2926 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 2927 fsid = le64_to_cpup((void *)es->s_uuid) ^
2928 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2929 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2930 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
ac27a0ec
DK		 2931 return 0;
2932}
2933
2934/* Helper function for writing quotas on sync - we need to start transaction before quota file
2935 * is locked for write. Otherwise the are possible deadlocks:
2936 * Process 1 Process 2
617ba13b 2937 * ext4_create() quota_sync()
dab291af 2938 * jbd2_journal_start() write_dquot()
ac27a0ec 2939 * DQUOT_INIT() down(dqio_mutex)
dab291af 2940 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 2941 *
2942 */
2943
2944#ifdef CONFIG_QUOTA
2945
2946static inline struct inode *dquot_to_inode(struct dquot *dquot)
2947{
2948 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2949}
2950
617ba13b 2951static int ext4_dquot_initialize(struct inode *inode, int type)
ac27a0ec
DK		 2952{
2953 handle_t *handle;
2954 int ret, err;
2955
2956 /* We may create quota structure so we need to reserve enough blocks */
617ba13b 2957 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb));
ac27a0ec
DK		 2958 if (IS_ERR(handle))
2959 return PTR_ERR(handle);
2960 ret = dquot_initialize(inode, type);
617ba13b 2961 err = ext4_journal_stop(handle);
ac27a0ec
DK		 2962 if (!ret)
2963 ret = err;
2964 return ret;
2965}
2966
617ba13b 2967static int ext4_dquot_drop(struct inode *inode)
ac27a0ec
DK		 2968{
2969 handle_t *handle;
2970 int ret, err;
2971
2972 /* We may delete quota structure so we need to reserve enough blocks */
617ba13b 2973 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb));
ac27a0ec
DK		 2974 if (IS_ERR(handle))
2975 return PTR_ERR(handle);
2976 ret = dquot_drop(inode);
617ba13b 2977 err = ext4_journal_stop(handle);
ac27a0ec
DK		 2978 if (!ret)
2979 ret = err;
2980 return ret;
2981}
2982
617ba13b 2983static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 2984{
2985 int ret, err;
2986 handle_t *handle;
2987 struct inode *inode;
2988
2989 inode = dquot_to_inode(dquot);
617ba13b
MC		 2990 handle = ext4_journal_start(inode,
2991 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 2992 if (IS_ERR(handle))
2993 return PTR_ERR(handle);
2994 ret = dquot_commit(dquot);
617ba13b 2995 err = ext4_journal_stop(handle);
ac27a0ec
DK		 2996 if (!ret)
2997 ret = err;
2998 return ret;
2999}
3000
617ba13b 3001static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 3002{
3003 int ret, err;
3004 handle_t *handle;
3005
617ba13b
MC		 3006 handle = ext4_journal_start(dquot_to_inode(dquot),
3007 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 3008 if (IS_ERR(handle))
3009 return PTR_ERR(handle);
3010 ret = dquot_acquire(dquot);
617ba13b 3011 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3012 if (!ret)
3013 ret = err;
3014 return ret;
3015}
3016
617ba13b 3017static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 3018{
3019 int ret, err;
3020 handle_t *handle;
3021
617ba13b
MC		 3022 handle = ext4_journal_start(dquot_to_inode(dquot),
3023 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 3024 if (IS_ERR(handle)) {
3025 /* Release dquot anyway to avoid endless cycle in dqput() */
3026 dquot_release(dquot);
ac27a0ec 3027 return PTR_ERR(handle);
9c3013e9 3028 }
ac27a0ec 3029 ret = dquot_release(dquot);
617ba13b 3030 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3031 if (!ret)
3032 ret = err;
3033 return ret;
3034}
3035
617ba13b 3036static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec
DK		 3037{
3038 /* Are we journalling quotas? */
617ba13b
MC		 3039 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
3040 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
ac27a0ec 3041 dquot_mark_dquot_dirty(dquot);
617ba13b 3042 return ext4_write_dquot(dquot);
ac27a0ec
DK		 3043 } else {
3044 return dquot_mark_dquot_dirty(dquot);
3045 }
3046}
3047
617ba13b 3048static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 3049{
3050 int ret, err;
3051 handle_t *handle;
3052
3053 /* Data block + inode block */
617ba13b 3054 handle = ext4_journal_start(sb->s_root->d_inode, 2);
ac27a0ec
DK		 3055 if (IS_ERR(handle))
3056 return PTR_ERR(handle);
3057 ret = dquot_commit_info(sb, type);
617ba13b 3058 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3059 if (!ret)
3060 ret = err;
3061 return ret;
3062}
3063
3064/*
3065 * Turn on quotas during mount time - we need to find
3066 * the quota file and such...
3067 */
617ba13b 3068static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 3069{
617ba13b
MC		 3070 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
3071 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 3072}
3073
3074/*
3075 * Standard function to be called on quota_on
3076 */
617ba13b 3077static int ext4_quota_on(struct super_block *sb, int type, int format_id,
ac27a0ec
DK		 3078 char *path)
3079{
3080 int err;
3081 struct nameidata nd;
3082
3083 if (!test_opt(sb, QUOTA))
3084 return -EINVAL;
3085 /* Not journalling quota? */
617ba13b
MC		 3086 if (!EXT4_SB(sb)->s_qf_names[USRQUOTA] &&
3087 !EXT4_SB(sb)->s_qf_names[GRPQUOTA])
ac27a0ec
DK		 3088 return vfs_quota_on(sb, type, format_id, path);
3089 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
3090 if (err)
3091 return err;
3092 /* Quotafile not on the same filesystem? */
3093 if (nd.mnt->mnt_sb != sb) {
3094 path_release(&nd);
3095 return -EXDEV;
3096 }
3097 /* Quotafile not of fs root? */
3098 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
3099 printk(KERN_WARNING
617ba13b 3100 "EXT4-fs: Quota file not on filesystem root. "
ac27a0ec
DK		 3101 "Journalled quota will not work.\n");
3102 path_release(&nd);
3103 return vfs_quota_on(sb, type, format_id, path);
3104}
3105
3106/* Read data from quotafile - avoid pagecache and such because we cannot afford
3107 * acquiring the locks... As quota files are never truncated and quota code
3108 * itself serializes the operations (and noone else should touch the files)
3109 * we don't have to be afraid of races */
617ba13b 3110static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 3111 size_t len, loff_t off)
3112{
3113 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 3114 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 3115 int err = 0;
3116 int offset = off & (sb->s_blocksize - 1);
3117 int tocopy;
3118 size_t toread;
3119 struct buffer_head *bh;
3120 loff_t i_size = i_size_read(inode);
3121
3122 if (off > i_size)
3123 return 0;
3124 if (off+len > i_size)
3125 len = i_size-off;
3126 toread = len;
3127 while (toread > 0) {
3128 tocopy = sb->s_blocksize - offset < toread ?
3129 sb->s_blocksize - offset : toread;
617ba13b 3130 bh = ext4_bread(NULL, inode, blk, 0, &err);
ac27a0ec
DK		 3131 if (err)
3132 return err;
3133 if (!bh) /* A hole? */
3134 memset(data, 0, tocopy);
3135 else
3136 memcpy(data, bh->b_data+offset, tocopy);
3137 brelse(bh);
3138 offset = 0;
3139 toread -= tocopy;
3140 data += tocopy;
3141 blk++;
3142 }
3143 return len;
3144}
3145
3146/* Write to quotafile (we know the transaction is already started and has
3147 * enough credits) */
617ba13b 3148static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 3149 const char *data, size_t len, loff_t off)
3150{
3151 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 3152 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 3153 int err = 0;
3154 int offset = off & (sb->s_blocksize - 1);
3155 int tocopy;
617ba13b 3156 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
ac27a0ec
DK		 3157 size_t towrite = len;
3158 struct buffer_head *bh;
3159 handle_t *handle = journal_current_handle();
3160
9c3013e9
JK		 3161 if (!handle) {
3162 printk(KERN_WARNING "EXT4-fs: Quota write (off=%Lu, len=%Lu)"
3163 " cancelled because transaction is not started.\n",
3164 (unsigned long long)off, (unsigned long long)len);
3165 return -EIO;
3166 }
ac27a0ec
DK		 3167 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
3168 while (towrite > 0) {
3169 tocopy = sb->s_blocksize - offset < towrite ?
3170 sb->s_blocksize - offset : towrite;
617ba13b 3171 bh = ext4_bread(handle, inode, blk, 1, &err);
ac27a0ec
DK		 3172 if (!bh)
3173 goto out;
3174 if (journal_quota) {
617ba13b 3175 err = ext4_journal_get_write_access(handle, bh);
ac27a0ec
DK		 3176 if (err) {
3177 brelse(bh);
3178 goto out;
3179 }
3180 }
3181 lock_buffer(bh);
3182 memcpy(bh->b_data+offset, data, tocopy);
3183 flush_dcache_page(bh->b_page);
3184 unlock_buffer(bh);
3185 if (journal_quota)
617ba13b 3186 err = ext4_journal_dirty_metadata(handle, bh);
ac27a0ec
DK		 3187 else {
3188 /* Always do at least ordered writes for quotas */
617ba13b 3189 err = ext4_journal_dirty_data(handle, bh);
ac27a0ec
DK		 3190 mark_buffer_dirty(bh);
3191 }
3192 brelse(bh);
3193 if (err)
3194 goto out;
3195 offset = 0;
3196 towrite -= tocopy;
3197 data += tocopy;
3198 blk++;
3199 }
3200out:
3201 if (len == towrite)
3202 return err;
3203 if (inode->i_size < off+len-towrite) {
3204 i_size_write(inode, off+len-towrite);
617ba13b 3205 EXT4_I(inode)->i_disksize = inode->i_size;
ac27a0ec 3206 }
ac27a0ec 3207 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
617ba13b 3208 ext4_mark_inode_dirty(handle, inode);
ac27a0ec
DK		 3209 mutex_unlock(&inode->i_mutex);
3210 return len - towrite;
3211}
3212
3213#endif
3214
617ba13b 3215static int ext4_get_sb(struct file_system_type *fs_type,
ac27a0ec
DK		 3216 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3217{
617ba13b 3218 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
ac27a0ec
DK		 3219}
3220
617ba13b 3221static struct file_system_type ext4dev_fs_type = {
ac27a0ec 3222 .owner = THIS_MODULE,
617ba13b
MC		 3223 .name = "ext4dev",
3224 .get_sb = ext4_get_sb,
ac27a0ec
DK		 3225 .kill_sb = kill_block_super,
3226 .fs_flags = FS_REQUIRES_DEV,
3227};
3228
617ba13b 3229static int __init init_ext4_fs(void)
ac27a0ec 3230{
617ba13b 3231 int err = init_ext4_xattr();
ac27a0ec
DK		 3232 if (err)
3233 return err;
3234 err = init_inodecache();
3235 if (err)
3236 goto out1;
63f57933 3237 err = register_filesystem(&ext4dev_fs_type);
ac27a0ec
DK		 3238 if (err)
3239 goto out;
3240 return 0;
3241out:
3242 destroy_inodecache();
3243out1:
617ba13b 3244 exit_ext4_xattr();
ac27a0ec
DK		 3245 return err;
3246}
3247
617ba13b 3248static void __exit exit_ext4_fs(void)
ac27a0ec 3249{
617ba13b 3250 unregister_filesystem(&ext4dev_fs_type);
ac27a0ec 3251 destroy_inodecache();
617ba13b 3252 exit_ext4_xattr();
ac27a0ec
DK		 3253}
3254
3255MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
617ba13b 3256MODULE_DESCRIPTION("Fourth Extended Filesystem with extents");
ac27a0ec 3257MODULE_LICENSE("GPL");
617ba13b
MC		 3258module_init(init_ext4_fs)
3259module_exit(exit_ext4_fs)
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