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ext4: Add multi block allocator for ext4
[mirror_ubuntu-focal-kernel.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 (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
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
c9de560d 506 ext4_mb_release(sb);
a86c6181 507 ext4_ext_release(sb);
617ba13b 508 ext4_xattr_put_super(sb);
dab291af 509 jbd2_journal_destroy(sbi->s_journal);
ac27a0ec 510 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 511 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec
DK		 512 es->s_state = cpu_to_le16(sbi->s_mount_state);
513 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
514 mark_buffer_dirty(sbi->s_sbh);
617ba13b 515 ext4_commit_super(sb, es, 1);
ac27a0ec
DK		 516 }
517
518 for (i = 0; i < sbi->s_gdb_count; i++)
519 brelse(sbi->s_group_desc[i]);
520 kfree(sbi->s_group_desc);
521 percpu_counter_destroy(&sbi->s_freeblocks_counter);
522 percpu_counter_destroy(&sbi->s_freeinodes_counter);
523 percpu_counter_destroy(&sbi->s_dirs_counter);
524 brelse(sbi->s_sbh);
525#ifdef CONFIG_QUOTA
526 for (i = 0; i < MAXQUOTAS; i++)
527 kfree(sbi->s_qf_names[i]);
528#endif
529
530 /* Debugging code just in case the in-memory inode orphan list
531 * isn't empty. The on-disk one can be non-empty if we've
532 * detected an error and taken the fs readonly, but the
533 * in-memory list had better be clean by this point. */
534 if (!list_empty(&sbi->s_orphan))
535 dump_orphan_list(sb, sbi);
536 J_ASSERT(list_empty(&sbi->s_orphan));
537
f98393a6 538 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 539 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
540 /*
541 * Invalidate the journal device's buffers. We don't want them
542 * floating about in memory - the physical journal device may
543 * hotswapped, and it breaks the `ro-after' testing code.
544 */
545 sync_blockdev(sbi->journal_bdev);
f98393a6 546 invalidate_bdev(sbi->journal_bdev);
617ba13b 547 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 548 }
549 sb->s_fs_info = NULL;
550 kfree(sbi);
551 return;
552}
553
e18b890b 554static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 555
556/*
557 * Called inside transaction, so use GFP_NOFS
558 */
617ba13b 559static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 560{
617ba13b 561 struct ext4_inode_info *ei;
ac27a0ec 562
e6b4f8da 563 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 564 if (!ei)
565 return NULL;
617ba13b
MC		 566#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
567 ei->i_acl = EXT4_ACL_NOT_CACHED;
568 ei->i_default_acl = EXT4_ACL_NOT_CACHED;
ac27a0ec
DK		 569#endif
570 ei->i_block_alloc_info = NULL;
571 ei->vfs_inode.i_version = 1;
a86c6181 572 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
c9de560d
AT		 573 INIT_LIST_HEAD(&ei->i_prealloc_list);
574 spin_lock_init(&ei->i_prealloc_lock);
ac27a0ec
DK		 575 return &ei->vfs_inode;
576}
577
617ba13b 578static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 579{
9f7dd93d
VA		 580 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
581 printk("EXT4 Inode %p: orphan list check failed!\n",
582 EXT4_I(inode));
583 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
584 EXT4_I(inode), sizeof(struct ext4_inode_info),
585 true);
586 dump_stack();
587 }
617ba13b 588 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
ac27a0ec
DK		 589}
590
4ba9b9d0 591static void init_once(struct kmem_cache *cachep, void *foo)
ac27a0ec 592{
617ba13b 593 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 594
a35afb83 595 INIT_LIST_HEAD(&ei->i_orphan);
617ba13b 596#ifdef CONFIG_EXT4DEV_FS_XATTR
a35afb83 597 init_rwsem(&ei->xattr_sem);
ac27a0ec 598#endif
0e855ac8 599 init_rwsem(&ei->i_data_sem);
a35afb83 600 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 601}
602
603static int init_inodecache(void)
604{
617ba13b
MC		 605 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
606 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 607 0, (SLAB_RECLAIM_ACCOUNT|
608 SLAB_MEM_SPREAD),
20c2df83 609 init_once);
617ba13b 610 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 611 return -ENOMEM;
612 return 0;
613}
614
615static void destroy_inodecache(void)
616{
617ba13b 617 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 618}
619
617ba13b 620static void ext4_clear_inode(struct inode *inode)
ac27a0ec 621{
617ba13b
MC		 622 struct ext4_block_alloc_info *rsv = EXT4_I(inode)->i_block_alloc_info;
623#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
624 if (EXT4_I(inode)->i_acl &&
625 EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) {
626 posix_acl_release(EXT4_I(inode)->i_acl);
627 EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED;
628 }
629 if (EXT4_I(inode)->i_default_acl &&
630 EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) {
631 posix_acl_release(EXT4_I(inode)->i_default_acl);
632 EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED;
ac27a0ec
DK		 633 }
634#endif
617ba13b
MC		 635 ext4_discard_reservation(inode);
636 EXT4_I(inode)->i_block_alloc_info = NULL;
ac27a0ec
DK		 637 if (unlikely(rsv))
638 kfree(rsv);
639}
640
617ba13b 641static inline void ext4_show_quota_options(struct seq_file *seq, struct super_block *sb)
ac27a0ec
DK		 642{
643#if defined(CONFIG_QUOTA)
617ba13b 644 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 645
646 if (sbi->s_jquota_fmt)
647 seq_printf(seq, ",jqfmt=%s",
648 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
649
650 if (sbi->s_qf_names[USRQUOTA])
651 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
652
653 if (sbi->s_qf_names[GRPQUOTA])
654 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
655
617ba13b 656 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
ac27a0ec
DK		 657 seq_puts(seq, ",usrquota");
658
617ba13b 659 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
ac27a0ec
DK		 660 seq_puts(seq, ",grpquota");
661#endif
662}
663
d9c9bef1
MS		 664/*
665 * Show an option if
666 * - it's set to a non-default value OR
667 * - if the per-sb default is different from the global default
668 */
617ba13b 669static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
ac27a0ec 670{
aa22df2c
AK		 671 int def_errors;
672 unsigned long def_mount_opts;
ac27a0ec 673 struct super_block *sb = vfs->mnt_sb;
d9c9bef1
MS		 674 struct ext4_sb_info *sbi = EXT4_SB(sb);
675 struct ext4_super_block *es = sbi->s_es;
d9c9bef1
MS		 676
677 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
aa22df2c 678 def_errors = le16_to_cpu(es->s_errors);
d9c9bef1
MS		 679
680 if (sbi->s_sb_block != 1)
681 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
682 if (test_opt(sb, MINIX_DF))
683 seq_puts(seq, ",minixdf");
aa22df2c 684 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
d9c9bef1
MS		 685 seq_puts(seq, ",grpid");
686 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
687 seq_puts(seq, ",nogrpid");
688 if (sbi->s_resuid != EXT4_DEF_RESUID ||
689 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
690 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
691 }
692 if (sbi->s_resgid != EXT4_DEF_RESGID ||
693 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
694 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
695 }
bb4f397a 696 if (test_opt(sb, ERRORS_RO)) {
d9c9bef1 697 if (def_errors == EXT4_ERRORS_PANIC ||
bb4f397a
AK		 698 def_errors == EXT4_ERRORS_CONTINUE) {
699 seq_puts(seq, ",errors=remount-ro");
d9c9bef1
MS		 700 }
701 }
aa22df2c 702 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
bb4f397a 703 seq_puts(seq, ",errors=continue");
aa22df2c 704 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
d9c9bef1 705 seq_puts(seq, ",errors=panic");
aa22df2c 706 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
d9c9bef1 707 seq_puts(seq, ",nouid32");
aa22df2c 708 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
d9c9bef1
MS		 709 seq_puts(seq, ",debug");
710 if (test_opt(sb, OLDALLOC))
711 seq_puts(seq, ",oldalloc");
07620f69 712#ifdef CONFIG_EXT4DEV_FS_XATTR
aa22df2c
AK		 713 if (test_opt(sb, XATTR_USER) &&
714 !(def_mount_opts & EXT4_DEFM_XATTR_USER))
d9c9bef1
MS		 715 seq_puts(seq, ",user_xattr");
716 if (!test_opt(sb, XATTR_USER) &&
717 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
718 seq_puts(seq, ",nouser_xattr");
719 }
720#endif
07620f69 721#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
aa22df2c 722 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
d9c9bef1
MS		 723 seq_puts(seq, ",acl");
724 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
725 seq_puts(seq, ",noacl");
726#endif
727 if (!test_opt(sb, RESERVATION))
728 seq_puts(seq, ",noreservation");
729 if (sbi->s_commit_interval) {
730 seq_printf(seq, ",commit=%u",
731 (unsigned) (sbi->s_commit_interval / HZ));
732 }
733 if (test_opt(sb, BARRIER))
734 seq_puts(seq, ",barrier=1");
735 if (test_opt(sb, NOBH))
736 seq_puts(seq, ",nobh");
737 if (!test_opt(sb, EXTENTS))
738 seq_puts(seq, ",noextents");
25ec56b5
JNC		 739 if (test_opt(sb, I_VERSION))
740 seq_puts(seq, ",i_version");
ac27a0ec 741
aa22df2c
AK		 742 /*
743 * journal mode get enabled in different ways
744 * So just print the value even if we didn't specify it
745 */
617ba13b 746 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
ac27a0ec 747 seq_puts(seq, ",data=journal");
617ba13b 748 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
ac27a0ec 749 seq_puts(seq, ",data=ordered");
617ba13b 750 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
ac27a0ec
DK		 751 seq_puts(seq, ",data=writeback");
752
617ba13b 753 ext4_show_quota_options(seq, sb);
ac27a0ec
DK		 754 return 0;
755}
756
757
1b961ac0
CH		 758static struct inode *ext4_nfs_get_inode(struct super_block *sb,
759 u64 ino, u32 generation)
ac27a0ec 760{
ac27a0ec 761 struct inode *inode;
ac27a0ec 762
617ba13b 763 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 764 return ERR_PTR(-ESTALE);
617ba13b 765 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 766 return ERR_PTR(-ESTALE);
767
768 /* iget isn't really right if the inode is currently unallocated!!
769 *
617ba13b 770 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 771 * deleted, so we should be safe.
772 *
773 * Currently we don't know the generation for parent directory, so
774 * a generation of 0 means "accept any"
775 */
776 inode = iget(sb, ino);
777 if (inode == NULL)
778 return ERR_PTR(-ENOMEM);
779 if (is_bad_inode(inode) ||
780 (generation && inode->i_generation != generation)) {
781 iput(inode);
782 return ERR_PTR(-ESTALE);
783 }
1b961ac0
CH		 784
785 return inode;
786}
787
788static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
789 int fh_len, int fh_type)
790{
791 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
792 ext4_nfs_get_inode);
793}
794
795static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
796 int fh_len, int fh_type)
797{
798 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
799 ext4_nfs_get_inode);
ac27a0ec
DK		 800}
801
802#ifdef CONFIG_QUOTA
803#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
804#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
805
617ba13b
MC		 806static int ext4_dquot_initialize(struct inode *inode, int type);
807static int ext4_dquot_drop(struct inode *inode);
808static int ext4_write_dquot(struct dquot *dquot);
809static int ext4_acquire_dquot(struct dquot *dquot);
810static int ext4_release_dquot(struct dquot *dquot);
811static int ext4_mark_dquot_dirty(struct dquot *dquot);
812static int ext4_write_info(struct super_block *sb, int type);
813static int ext4_quota_on(struct super_block *sb, int type, int format_id, char *path);
814static int ext4_quota_on_mount(struct super_block *sb, int type);
815static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 816 size_t len, loff_t off);
617ba13b 817static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 818 const char *data, size_t len, loff_t off);
819
617ba13b
MC		 820static struct dquot_operations ext4_quota_operations = {
821 .initialize = ext4_dquot_initialize,
822 .drop = ext4_dquot_drop,
ac27a0ec
DK		 823 .alloc_space = dquot_alloc_space,
824 .alloc_inode = dquot_alloc_inode,
825 .free_space = dquot_free_space,
826 .free_inode = dquot_free_inode,
827 .transfer = dquot_transfer,
617ba13b
MC		 828 .write_dquot = ext4_write_dquot,
829 .acquire_dquot = ext4_acquire_dquot,
830 .release_dquot = ext4_release_dquot,
831 .mark_dirty = ext4_mark_dquot_dirty,
832 .write_info = ext4_write_info
ac27a0ec
DK		 833};
834
617ba13b
MC		 835static struct quotactl_ops ext4_qctl_operations = {
836 .quota_on = ext4_quota_on,
ac27a0ec
DK		 837 .quota_off = vfs_quota_off,
838 .quota_sync = vfs_quota_sync,
839 .get_info = vfs_get_dqinfo,
840 .set_info = vfs_set_dqinfo,
841 .get_dqblk = vfs_get_dqblk,
842 .set_dqblk = vfs_set_dqblk
843};
844#endif
845
ee9b6d61 846static const struct super_operations ext4_sops = {
617ba13b
MC		 847 .alloc_inode = ext4_alloc_inode,
848 .destroy_inode = ext4_destroy_inode,
849 .read_inode = ext4_read_inode,
850 .write_inode = ext4_write_inode,
851 .dirty_inode = ext4_dirty_inode,
852 .delete_inode = ext4_delete_inode,
853 .put_super = ext4_put_super,
854 .write_super = ext4_write_super,
855 .sync_fs = ext4_sync_fs,
856 .write_super_lockfs = ext4_write_super_lockfs,
857 .unlockfs = ext4_unlockfs,
858 .statfs = ext4_statfs,
859 .remount_fs = ext4_remount,
860 .clear_inode = ext4_clear_inode,
861 .show_options = ext4_show_options,
ac27a0ec 862#ifdef CONFIG_QUOTA
617ba13b
MC		 863 .quota_read = ext4_quota_read,
864 .quota_write = ext4_quota_write,
ac27a0ec
DK		 865#endif
866};
867
39655164 868static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 869 .fh_to_dentry = ext4_fh_to_dentry,
870 .fh_to_parent = ext4_fh_to_parent,
617ba13b 871 .get_parent = ext4_get_parent,
ac27a0ec
DK		 872};
873
874enum {
875 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
876 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
877 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
878 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
879 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
880 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
818d276c 881 Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec
DK		 882 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
883 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
884 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
885 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
25ec56b5 886 Opt_grpquota, Opt_extents, Opt_noextents, Opt_i_version,
c9de560d 887 Opt_mballoc, Opt_nomballoc, Opt_stripe,
ac27a0ec
DK		 888};
889
890static match_table_t tokens = {
891 {Opt_bsd_df, "bsddf"},
892 {Opt_minix_df, "minixdf"},
893 {Opt_grpid, "grpid"},
894 {Opt_grpid, "bsdgroups"},
895 {Opt_nogrpid, "nogrpid"},
896 {Opt_nogrpid, "sysvgroups"},
897 {Opt_resgid, "resgid=%u"},
898 {Opt_resuid, "resuid=%u"},
899 {Opt_sb, "sb=%u"},
900 {Opt_err_cont, "errors=continue"},
901 {Opt_err_panic, "errors=panic"},
902 {Opt_err_ro, "errors=remount-ro"},
903 {Opt_nouid32, "nouid32"},
904 {Opt_nocheck, "nocheck"},
905 {Opt_nocheck, "check=none"},
906 {Opt_debug, "debug"},
907 {Opt_oldalloc, "oldalloc"},
908 {Opt_orlov, "orlov"},
909 {Opt_user_xattr, "user_xattr"},
910 {Opt_nouser_xattr, "nouser_xattr"},
911 {Opt_acl, "acl"},
912 {Opt_noacl, "noacl"},
913 {Opt_reservation, "reservation"},
914 {Opt_noreservation, "noreservation"},
915 {Opt_noload, "noload"},
916 {Opt_nobh, "nobh"},
917 {Opt_bh, "bh"},
918 {Opt_commit, "commit=%u"},
919 {Opt_journal_update, "journal=update"},
920 {Opt_journal_inum, "journal=%u"},
921 {Opt_journal_dev, "journal_dev=%u"},
818d276c
GS		 922 {Opt_journal_checksum, "journal_checksum"},
923 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 924 {Opt_abort, "abort"},
925 {Opt_data_journal, "data=journal"},
926 {Opt_data_ordered, "data=ordered"},
927 {Opt_data_writeback, "data=writeback"},
928 {Opt_offusrjquota, "usrjquota="},
929 {Opt_usrjquota, "usrjquota=%s"},
930 {Opt_offgrpjquota, "grpjquota="},
931 {Opt_grpjquota, "grpjquota=%s"},
932 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
933 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
934 {Opt_grpquota, "grpquota"},
935 {Opt_noquota, "noquota"},
936 {Opt_quota, "quota"},
937 {Opt_usrquota, "usrquota"},
938 {Opt_barrier, "barrier=%u"},
a86c6181 939 {Opt_extents, "extents"},
1e2462f9 940 {Opt_noextents, "noextents"},
25ec56b5 941 {Opt_i_version, "i_version"},
c9de560d
AT		 942 {Opt_mballoc, "mballoc"},
943 {Opt_nomballoc, "nomballoc"},
944 {Opt_stripe, "stripe=%u"},
ac27a0ec
DK		 945 {Opt_err, NULL},
946 {Opt_resize, "resize"},
947};
948
617ba13b 949static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 950{
617ba13b 951 ext4_fsblk_t sb_block;
ac27a0ec
DK		 952 char *options = (char *) *data;
953
954 if (!options || strncmp(options, "sb=", 3) != 0)
955 return 1; /* Default location */
956 options += 3;
617ba13b 957 /*todo: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 958 sb_block = simple_strtoul(options, &options, 0);
959 if (*options && *options != ',') {
617ba13b 960 printk("EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 961 (char *) *data);
962 return 1;
963 }
964 if (*options == ',')
965 options++;
966 *data = (void *) options;
967 return sb_block;
968}
969
970static int parse_options (char *options, struct super_block *sb,
971 unsigned int *inum, unsigned long *journal_devnum,
617ba13b 972 ext4_fsblk_t *n_blocks_count, int is_remount)
ac27a0ec 973{
617ba13b 974 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 975 char * p;
976 substring_t args[MAX_OPT_ARGS];
977 int data_opt = 0;
978 int option;
979#ifdef CONFIG_QUOTA
980 int qtype;
981 char *qname;
982#endif
983
984 if (!options)
985 return 1;
986
987 while ((p = strsep (&options, ",")) != NULL) {
988 int token;
989 if (!*p)
990 continue;
991
992 token = match_token(p, tokens, args);
993 switch (token) {
994 case Opt_bsd_df:
995 clear_opt (sbi->s_mount_opt, MINIX_DF);
996 break;
997 case Opt_minix_df:
998 set_opt (sbi->s_mount_opt, MINIX_DF);
999 break;
1000 case Opt_grpid:
1001 set_opt (sbi->s_mount_opt, GRPID);
1002 break;
1003 case Opt_nogrpid:
1004 clear_opt (sbi->s_mount_opt, GRPID);
1005 break;
1006 case Opt_resuid:
1007 if (match_int(&args[0], &option))
1008 return 0;
1009 sbi->s_resuid = option;
1010 break;
1011 case Opt_resgid:
1012 if (match_int(&args[0], &option))
1013 return 0;
1014 sbi->s_resgid = option;
1015 break;
1016 case Opt_sb:
1017 /* handled by get_sb_block() instead of here */
1018 /* *sb_block = match_int(&args[0]); */
1019 break;
1020 case Opt_err_panic:
1021 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1022 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1023 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
1024 break;
1025 case Opt_err_ro:
1026 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1027 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1028 set_opt (sbi->s_mount_opt, ERRORS_RO);
1029 break;
1030 case Opt_err_cont:
1031 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1032 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1033 set_opt (sbi->s_mount_opt, ERRORS_CONT);
1034 break;
1035 case Opt_nouid32:
1036 set_opt (sbi->s_mount_opt, NO_UID32);
1037 break;
1038 case Opt_nocheck:
1039 clear_opt (sbi->s_mount_opt, CHECK);
1040 break;
1041 case Opt_debug:
1042 set_opt (sbi->s_mount_opt, DEBUG);
1043 break;
1044 case Opt_oldalloc:
1045 set_opt (sbi->s_mount_opt, OLDALLOC);
1046 break;
1047 case Opt_orlov:
1048 clear_opt (sbi->s_mount_opt, OLDALLOC);
1049 break;
617ba13b 1050#ifdef CONFIG_EXT4DEV_FS_XATTR
ac27a0ec
DK		 1051 case Opt_user_xattr:
1052 set_opt (sbi->s_mount_opt, XATTR_USER);
1053 break;
1054 case Opt_nouser_xattr:
1055 clear_opt (sbi->s_mount_opt, XATTR_USER);
1056 break;
1057#else
1058 case Opt_user_xattr:
1059 case Opt_nouser_xattr:
617ba13b 1060 printk("EXT4 (no)user_xattr options not supported\n");
ac27a0ec
DK		 1061 break;
1062#endif
617ba13b 1063#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
ac27a0ec
DK		 1064 case Opt_acl:
1065 set_opt(sbi->s_mount_opt, POSIX_ACL);
1066 break;
1067 case Opt_noacl:
1068 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1069 break;
1070#else
1071 case Opt_acl:
1072 case Opt_noacl:
617ba13b 1073 printk("EXT4 (no)acl options not supported\n");
ac27a0ec
DK		 1074 break;
1075#endif
1076 case Opt_reservation:
1077 set_opt(sbi->s_mount_opt, RESERVATION);
1078 break;
1079 case Opt_noreservation:
1080 clear_opt(sbi->s_mount_opt, RESERVATION);
1081 break;
1082 case Opt_journal_update:
1083 /* @@@ FIXME */
1084 /* Eventually we will want to be able to create
1085 a journal file here. For now, only allow the
1086 user to specify an existing inode to be the
1087 journal file. */
1088 if (is_remount) {
617ba13b 1089 printk(KERN_ERR "EXT4-fs: cannot specify "
ac27a0ec
DK		 1090 "journal on remount\n");
1091 return 0;
1092 }
1093 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1094 break;
1095 case Opt_journal_inum:
1096 if (is_remount) {
617ba13b 1097 printk(KERN_ERR "EXT4-fs: cannot specify "
ac27a0ec
DK		 1098 "journal on remount\n");
1099 return 0;
1100 }
1101 if (match_int(&args[0], &option))
1102 return 0;
1103 *inum = option;
1104 break;
1105 case Opt_journal_dev:
1106 if (is_remount) {
617ba13b 1107 printk(KERN_ERR "EXT4-fs: cannot specify "
ac27a0ec
DK		 1108 "journal on remount\n");
1109 return 0;
1110 }
1111 if (match_int(&args[0], &option))
1112 return 0;
1113 *journal_devnum = option;
1114 break;
818d276c
GS		 1115 case Opt_journal_checksum:
1116 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1117 break;
1118 case Opt_journal_async_commit:
1119 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
1120 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1121 break;
ac27a0ec
DK		 1122 case Opt_noload:
1123 set_opt (sbi->s_mount_opt, NOLOAD);
1124 break;
1125 case Opt_commit:
1126 if (match_int(&args[0], &option))
1127 return 0;
1128 if (option < 0)
1129 return 0;
1130 if (option == 0)
cd02ff0b 1131 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
ac27a0ec
DK		 1132 sbi->s_commit_interval = HZ * option;
1133 break;
1134 case Opt_data_journal:
617ba13b 1135 data_opt = EXT4_MOUNT_JOURNAL_DATA;
ac27a0ec
DK		 1136 goto datacheck;
1137 case Opt_data_ordered:
617ba13b 1138 data_opt = EXT4_MOUNT_ORDERED_DATA;
ac27a0ec
DK		 1139 goto datacheck;
1140 case Opt_data_writeback:
617ba13b 1141 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
ac27a0ec
DK		 1142 datacheck:
1143 if (is_remount) {
617ba13b 1144 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
ac27a0ec
DK		 1145 != data_opt) {
1146 printk(KERN_ERR
617ba13b 1147 "EXT4-fs: cannot change data "
ac27a0ec
DK		 1148 "mode on remount\n");
1149 return 0;
1150 }
1151 } else {
617ba13b 1152 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
ac27a0ec
DK		 1153 sbi->s_mount_opt |= data_opt;
1154 }
1155 break;
1156#ifdef CONFIG_QUOTA
1157 case Opt_usrjquota:
1158 qtype = USRQUOTA;
1159 goto set_qf_name;
1160 case Opt_grpjquota:
1161 qtype = GRPQUOTA;
1162set_qf_name:
1163 if (sb_any_quota_enabled(sb)) {
1164 printk(KERN_ERR
617ba13b 1165 "EXT4-fs: Cannot change journalled "
ac27a0ec
DK		 1166 "quota options when quota turned on.\n");
1167 return 0;
1168 }
1169 qname = match_strdup(&args[0]);
1170 if (!qname) {
1171 printk(KERN_ERR
617ba13b 1172 "EXT4-fs: not enough memory for "
ac27a0ec
DK		 1173 "storing quotafile name.\n");
1174 return 0;
1175 }
1176 if (sbi->s_qf_names[qtype] &&
1177 strcmp(sbi->s_qf_names[qtype], qname)) {
1178 printk(KERN_ERR
617ba13b 1179 "EXT4-fs: %s quota file already "
ac27a0ec
DK		 1180 "specified.\n", QTYPE2NAME(qtype));
1181 kfree(qname);
1182 return 0;
1183 }
1184 sbi->s_qf_names[qtype] = qname;
1185 if (strchr(sbi->s_qf_names[qtype], '/')) {
1186 printk(KERN_ERR
617ba13b 1187 "EXT4-fs: quotafile must be on "
ac27a0ec
DK		 1188 "filesystem root.\n");
1189 kfree(sbi->s_qf_names[qtype]);
1190 sbi->s_qf_names[qtype] = NULL;
1191 return 0;
1192 }
1193 set_opt(sbi->s_mount_opt, QUOTA);
1194 break;
1195 case Opt_offusrjquota:
1196 qtype = USRQUOTA;
1197 goto clear_qf_name;
1198 case Opt_offgrpjquota:
1199 qtype = GRPQUOTA;
1200clear_qf_name:
1201 if (sb_any_quota_enabled(sb)) {
617ba13b 1202 printk(KERN_ERR "EXT4-fs: Cannot change "
ac27a0ec
DK		 1203 "journalled quota options when "
1204 "quota turned on.\n");
1205 return 0;
1206 }
1207 /*
1208 * The space will be released later when all options
1209 * are confirmed to be correct
1210 */
1211 sbi->s_qf_names[qtype] = NULL;
1212 break;
1213 case Opt_jqfmt_vfsold:
1214 sbi->s_jquota_fmt = QFMT_VFS_OLD;
1215 break;
1216 case Opt_jqfmt_vfsv0:
1217 sbi->s_jquota_fmt = QFMT_VFS_V0;
1218 break;
1219 case Opt_quota:
1220 case Opt_usrquota:
1221 set_opt(sbi->s_mount_opt, QUOTA);
1222 set_opt(sbi->s_mount_opt, USRQUOTA);
1223 break;
1224 case Opt_grpquota:
1225 set_opt(sbi->s_mount_opt, QUOTA);
1226 set_opt(sbi->s_mount_opt, GRPQUOTA);
1227 break;
1228 case Opt_noquota:
1229 if (sb_any_quota_enabled(sb)) {
617ba13b 1230 printk(KERN_ERR "EXT4-fs: Cannot change quota "
ac27a0ec
DK		 1231 "options when quota turned on.\n");
1232 return 0;
1233 }
1234 clear_opt(sbi->s_mount_opt, QUOTA);
1235 clear_opt(sbi->s_mount_opt, USRQUOTA);
1236 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1237 break;
1238#else
1239 case Opt_quota:
1240 case Opt_usrquota:
1241 case Opt_grpquota:
1242 case Opt_usrjquota:
1243 case Opt_grpjquota:
1244 case Opt_offusrjquota:
1245 case Opt_offgrpjquota:
1246 case Opt_jqfmt_vfsold:
1247 case Opt_jqfmt_vfsv0:
1248 printk(KERN_ERR
617ba13b 1249 "EXT4-fs: journalled quota options not "
ac27a0ec
DK		 1250 "supported.\n");
1251 break;
1252 case Opt_noquota:
1253 break;
1254#endif
1255 case Opt_abort:
1256 set_opt(sbi->s_mount_opt, ABORT);
1257 break;
1258 case Opt_barrier:
1259 if (match_int(&args[0], &option))
1260 return 0;
1261 if (option)
1262 set_opt(sbi->s_mount_opt, BARRIER);
1263 else
1264 clear_opt(sbi->s_mount_opt, BARRIER);
1265 break;
1266 case Opt_ignore:
1267 break;
1268 case Opt_resize:
1269 if (!is_remount) {
617ba13b 1270 printk("EXT4-fs: resize option only available "
ac27a0ec
DK		 1271 "for remount\n");
1272 return 0;
1273 }
1274 if (match_int(&args[0], &option) != 0)
1275 return 0;
1276 *n_blocks_count = option;
1277 break;
1278 case Opt_nobh:
1279 set_opt(sbi->s_mount_opt, NOBH);
1280 break;
1281 case Opt_bh:
1282 clear_opt(sbi->s_mount_opt, NOBH);
1283 break;
a86c6181
AT		 1284 case Opt_extents:
1285 set_opt (sbi->s_mount_opt, EXTENTS);
1286 break;
1e2462f9
MC		 1287 case Opt_noextents:
1288 clear_opt (sbi->s_mount_opt, EXTENTS);
1289 break;
25ec56b5
JNC		 1290 case Opt_i_version:
1291 set_opt(sbi->s_mount_opt, I_VERSION);
1292 sb->s_flags |= MS_I_VERSION;
1293 break;
c9de560d
AT		 1294 case Opt_mballoc:
1295 set_opt(sbi->s_mount_opt, MBALLOC);
1296 break;
1297 case Opt_nomballoc:
1298 clear_opt(sbi->s_mount_opt, MBALLOC);
1299 break;
1300 case Opt_stripe:
1301 if (match_int(&args[0], &option))
1302 return 0;
1303 if (option < 0)
1304 return 0;
1305 sbi->s_stripe = option;
1306 break;
ac27a0ec
DK		 1307 default:
1308 printk (KERN_ERR
617ba13b 1309 "EXT4-fs: Unrecognized mount option \"%s\" "
ac27a0ec
DK		 1310 "or missing value\n", p);
1311 return 0;
1312 }
1313 }
1314#ifdef CONFIG_QUOTA
1315 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
617ba13b 1316 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
ac27a0ec
DK		 1317 sbi->s_qf_names[USRQUOTA])
1318 clear_opt(sbi->s_mount_opt, USRQUOTA);
1319
617ba13b 1320 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
ac27a0ec
DK		 1321 sbi->s_qf_names[GRPQUOTA])
1322 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1323
1324 if ((sbi->s_qf_names[USRQUOTA] &&
617ba13b 1325 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
ac27a0ec 1326 (sbi->s_qf_names[GRPQUOTA] &&
617ba13b
MC		 1327 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
1328 printk(KERN_ERR "EXT4-fs: old and new quota "
ac27a0ec
DK		 1329 "format mixing.\n");
1330 return 0;
1331 }
1332
1333 if (!sbi->s_jquota_fmt) {
617ba13b 1334 printk(KERN_ERR "EXT4-fs: journalled quota format "
ac27a0ec
DK		 1335 "not specified.\n");
1336 return 0;
1337 }
1338 } else {
1339 if (sbi->s_jquota_fmt) {
617ba13b 1340 printk(KERN_ERR "EXT4-fs: journalled quota format "
ac27a0ec
DK		 1341 "specified with no journalling "
1342 "enabled.\n");
1343 return 0;
1344 }
1345 }
1346#endif
1347 return 1;
1348}
1349
617ba13b 1350static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1351 int read_only)
1352{
617ba13b 1353 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1354 int res = 0;
1355
617ba13b
MC		 1356 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1357 printk (KERN_ERR "EXT4-fs warning: revision level too high, "
ac27a0ec
DK		 1358 "forcing read-only mode\n");
1359 res = MS_RDONLY;
1360 }
1361 if (read_only)
1362 return res;
617ba13b
MC		 1363 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1364 printk (KERN_WARNING "EXT4-fs warning: mounting unchecked fs, "
ac27a0ec 1365 "running e2fsck is recommended\n");
617ba13b 1366 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
ac27a0ec 1367 printk (KERN_WARNING
617ba13b 1368 "EXT4-fs warning: mounting fs with errors, "
ac27a0ec
DK		 1369 "running e2fsck is recommended\n");
1370 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1371 le16_to_cpu(es->s_mnt_count) >=
1372 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1373 printk (KERN_WARNING
617ba13b 1374 "EXT4-fs warning: maximal mount count reached, "
ac27a0ec
DK		 1375 "running e2fsck is recommended\n");
1376 else if (le32_to_cpu(es->s_checkinterval) &&
1377 (le32_to_cpu(es->s_lastcheck) +
1378 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1379 printk (KERN_WARNING
617ba13b 1380 "EXT4-fs warning: checktime reached, "
ac27a0ec
DK		 1381 "running e2fsck is recommended\n");
1382#if 0
1383 /* @@@ We _will_ want to clear the valid bit if we find
63f57933
AM		 1384 * inconsistencies, to force a fsck at reboot. But for
1385 * a plain journaled filesystem we can keep it set as
1386 * valid forever! :)
1387 */
617ba13b 1388 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT4_VALID_FS);
ac27a0ec
DK		 1389#endif
1390 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1391 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
ac27a0ec
DK		 1392 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
1393 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b
MC		 1394 ext4_update_dynamic_rev(sb);
1395 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1396
617ba13b 1397 ext4_commit_super(sb, es, 1);
ac27a0ec 1398 if (test_opt(sb, DEBUG))
617ba13b 1399 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, "
ac27a0ec
DK		 1400 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1401 sb->s_blocksize,
1402 sbi->s_groups_count,
617ba13b
MC		 1403 EXT4_BLOCKS_PER_GROUP(sb),
1404 EXT4_INODES_PER_GROUP(sb),
ac27a0ec
DK		 1405 sbi->s_mount_opt);
1406
617ba13b
MC		 1407 printk(KERN_INFO "EXT4 FS on %s, ", sb->s_id);
1408 if (EXT4_SB(sb)->s_journal->j_inode == NULL) {
ac27a0ec
DK		 1409 char b[BDEVNAME_SIZE];
1410
1411 printk("external journal on %s\n",
617ba13b 1412 bdevname(EXT4_SB(sb)->s_journal->j_dev, b));
ac27a0ec
DK		 1413 } else {
1414 printk("internal journal\n");
1415 }
1416 return res;
1417}
1418
717d50e4
AD		 1419__le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1420 struct ext4_group_desc *gdp)
1421{
1422 __u16 crc = 0;
1423
1424 if (sbi->s_es->s_feature_ro_compat &
1425 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1426 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1427 __le32 le_group = cpu_to_le32(block_group);
1428
1429 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1430 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1431 crc = crc16(crc, (__u8 *)gdp, offset);
1432 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1433 /* for checksum of struct ext4_group_desc do the rest...*/
1434 if ((sbi->s_es->s_feature_incompat &
1435 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1436 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1437 crc = crc16(crc, (__u8 *)gdp + offset,
1438 le16_to_cpu(sbi->s_es->s_desc_size) -
1439 offset);
1440 }
1441
1442 return cpu_to_le16(crc);
1443}
1444
1445int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1446 struct ext4_group_desc *gdp)
1447{
1448 if ((sbi->s_es->s_feature_ro_compat &
1449 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1450 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1451 return 0;
1452
1453 return 1;
1454}
1455
ac27a0ec 1456/* Called at mount-time, super-block is locked */
617ba13b 1457static int ext4_check_descriptors (struct super_block * sb)
ac27a0ec 1458{
617ba13b
MC		 1459 struct ext4_sb_info *sbi = EXT4_SB(sb);
1460 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1461 ext4_fsblk_t last_block;
bd81d8ee
LV		 1462 ext4_fsblk_t block_bitmap;
1463 ext4_fsblk_t inode_bitmap;
1464 ext4_fsblk_t inode_table;
617ba13b 1465 struct ext4_group_desc * gdp = NULL;
ac27a0ec 1466 int desc_block = 0;
ce421581 1467 int flexbg_flag = 0;
fd2d4291 1468 ext4_group_t i;
ac27a0ec 1469
ce421581
JS		 1470 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1471 flexbg_flag = 1;
1472
617ba13b 1473 ext4_debug ("Checking group descriptors");
ac27a0ec
DK		 1474
1475 for (i = 0; i < sbi->s_groups_count; i++)
1476 {
ce421581 1477 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 1478 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 1479 else
1480 last_block = first_block +
617ba13b 1481 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 1482
617ba13b
MC		 1483 if ((i % EXT4_DESC_PER_BLOCK(sb)) == 0)
1484 gdp = (struct ext4_group_desc *)
ac27a0ec 1485 sbi->s_group_desc[desc_block++]->b_data;
8fadc143 1486 block_bitmap = ext4_block_bitmap(sb, gdp);
bd81d8ee 1487 if (block_bitmap < first_block || block_bitmap > last_block)
ac27a0ec 1488 {
617ba13b 1489 ext4_error (sb, "ext4_check_descriptors",
fd2d4291 1490 "Block bitmap for group %lu"
2ae02107 1491 " not in group (block %llu)!",
bd81d8ee 1492 i, block_bitmap);
ac27a0ec
DK		 1493 return 0;
1494 }
8fadc143 1495 inode_bitmap = ext4_inode_bitmap(sb, gdp);
bd81d8ee 1496 if (inode_bitmap < first_block || inode_bitmap > last_block)
ac27a0ec 1497 {
617ba13b 1498 ext4_error (sb, "ext4_check_descriptors",
fd2d4291 1499 "Inode bitmap for group %lu"
2ae02107 1500 " not in group (block %llu)!",
bd81d8ee 1501 i, inode_bitmap);
ac27a0ec
DK		 1502 return 0;
1503 }
8fadc143 1504 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 1505 if (inode_table < first_block ||
780dcdb2 1506 inode_table + sbi->s_itb_per_group - 1 > last_block)
ac27a0ec 1507 {
617ba13b 1508 ext4_error (sb, "ext4_check_descriptors",
fd2d4291 1509 "Inode table for group %lu"
2ae02107 1510 " not in group (block %llu)!",
bd81d8ee 1511 i, inode_table);
ac27a0ec
DK		 1512 return 0;
1513 }
717d50e4
AD		 1514 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
1515 ext4_error(sb, __FUNCTION__,
fd2d4291
AM		 1516 "Checksum for group %lu failed (%u!=%u)\n",
1517 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
1518 gdp)), le16_to_cpu(gdp->bg_checksum));
717d50e4
AD		 1519 return 0;
1520 }
ce421581
JS		 1521 if (!flexbg_flag)
1522 first_block += EXT4_BLOCKS_PER_GROUP(sb);
0d1ee42f
AR		 1523 gdp = (struct ext4_group_desc *)
1524 ((__u8 *)gdp + EXT4_DESC_SIZE(sb));
ac27a0ec
DK		 1525 }
1526
bd81d8ee 1527 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
617ba13b 1528 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 1529 return 1;
1530}
1531
617ba13b 1532/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 1533 * the superblock) which were deleted from all directories, but held open by
1534 * a process at the time of a crash. We walk the list and try to delete these
1535 * inodes at recovery time (only with a read-write filesystem).
1536 *
1537 * In order to keep the orphan inode chain consistent during traversal (in
1538 * case of crash during recovery), we link each inode into the superblock
1539 * orphan list_head and handle it the same way as an inode deletion during
1540 * normal operation (which journals the operations for us).
1541 *
1542 * We only do an iget() and an iput() on each inode, which is very safe if we
1543 * accidentally point at an in-use or already deleted inode. The worst that
1544 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 1545 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 1546 * e2fsck was run on this filesystem, and it must have already done the orphan
1547 * inode cleanup for us, so we can safely abort without any further action.
1548 */
617ba13b
MC		 1549static void ext4_orphan_cleanup (struct super_block * sb,
1550 struct ext4_super_block * es)
ac27a0ec
DK		 1551{
1552 unsigned int s_flags = sb->s_flags;
1553 int nr_orphans = 0, nr_truncates = 0;
1554#ifdef CONFIG_QUOTA
1555 int i;
1556#endif
1557 if (!es->s_last_orphan) {
1558 jbd_debug(4, "no orphan inodes to clean up\n");
1559 return;
1560 }
1561
a8f48a95
ES		 1562 if (bdev_read_only(sb->s_bdev)) {
1563 printk(KERN_ERR "EXT4-fs: write access "
1564 "unavailable, skipping orphan cleanup.\n");
1565 return;
1566 }
1567
617ba13b 1568 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
ac27a0ec
DK		 1569 if (es->s_last_orphan)
1570 jbd_debug(1, "Errors on filesystem, "
1571 "clearing orphan list.\n");
1572 es->s_last_orphan = 0;
1573 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1574 return;
1575 }
1576
1577 if (s_flags & MS_RDONLY) {
617ba13b 1578 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n",
ac27a0ec
DK		 1579 sb->s_id);
1580 sb->s_flags &= ~MS_RDONLY;
1581 }
1582#ifdef CONFIG_QUOTA
1583 /* Needed for iput() to work correctly and not trash data */
1584 sb->s_flags |= MS_ACTIVE;
1585 /* Turn on quotas so that they are updated correctly */
1586 for (i = 0; i < MAXQUOTAS; i++) {
617ba13b
MC		 1587 if (EXT4_SB(sb)->s_qf_names[i]) {
1588 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec
DK		 1589 if (ret < 0)
1590 printk(KERN_ERR
617ba13b 1591 "EXT4-fs: Cannot turn on journalled "
ac27a0ec
DK		 1592 "quota: error %d\n", ret);
1593 }
1594 }
1595#endif
1596
1597 while (es->s_last_orphan) {
1598 struct inode *inode;
1599
1600 if (!(inode =
617ba13b 1601 ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
ac27a0ec
DK		 1602 es->s_last_orphan = 0;
1603 break;
1604 }
1605
617ba13b 1606 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
ac27a0ec
DK		 1607 DQUOT_INIT(inode);
1608 if (inode->i_nlink) {
1609 printk(KERN_DEBUG
1610 "%s: truncating inode %lu to %Ld bytes\n",
1611 __FUNCTION__, inode->i_ino, inode->i_size);
1612 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1613 inode->i_ino, inode->i_size);
617ba13b 1614 ext4_truncate(inode);
ac27a0ec
DK		 1615 nr_truncates++;
1616 } else {
1617 printk(KERN_DEBUG
1618 "%s: deleting unreferenced inode %lu\n",
1619 __FUNCTION__, inode->i_ino);
1620 jbd_debug(2, "deleting unreferenced inode %lu\n",
1621 inode->i_ino);
1622 nr_orphans++;
1623 }
1624 iput(inode); /* The delete magic happens here! */
1625 }
1626
1627#define PLURAL(x) (x), ((x)==1) ? "" : "s"
1628
1629 if (nr_orphans)
617ba13b 1630 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n",
ac27a0ec
DK		 1631 sb->s_id, PLURAL(nr_orphans));
1632 if (nr_truncates)
617ba13b 1633 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n",
ac27a0ec
DK		 1634 sb->s_id, PLURAL(nr_truncates));
1635#ifdef CONFIG_QUOTA
1636 /* Turn quotas off */
1637 for (i = 0; i < MAXQUOTAS; i++) {
1638 if (sb_dqopt(sb)->files[i])
1639 vfs_quota_off(sb, i);
1640 }
1641#endif
1642 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1643}
cd2291a4
ES		 1644/*
1645 * Maximal extent format file size.
1646 * Resulting logical blkno at s_maxbytes must fit in our on-disk
1647 * extent format containers, within a sector_t, and within i_blocks
1648 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
1649 * so that won't be a limiting factor.
1650 *
1651 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1652 */
1653static loff_t ext4_max_size(int blkbits)
1654{
1655 loff_t res;
1656 loff_t upper_limit = MAX_LFS_FILESIZE;
1657
1658 /* small i_blocks in vfs inode? */
1659 if (sizeof(blkcnt_t) < sizeof(u64)) {
1660 /*
1661 * CONFIG_LSF is not enabled implies the inode
1662 * i_block represent total blocks in 512 bytes
1663 * 32 == size of vfs inode i_blocks * 8
1664 */
1665 upper_limit = (1LL << 32) - 1;
1666
1667 /* total blocks in file system block size */
1668 upper_limit >>= (blkbits - 9);
1669 upper_limit <<= blkbits;
1670 }
1671
1672 /* 32-bit extent-start container, ee_block */
1673 res = 1LL << 32;
1674 res <<= blkbits;
1675 res -= 1;
1676
1677 /* Sanity check against vm- & vfs- imposed limits */
1678 if (res > upper_limit)
1679 res = upper_limit;
1680
1681 return res;
1682}
ac27a0ec 1683
ac27a0ec 1684/*
cd2291a4 1685 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 1686 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
1687 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 1688 */
cd2291a4 1689static loff_t ext4_max_bitmap_size(int bits)
ac27a0ec 1690{
617ba13b 1691 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 1692 int meta_blocks;
1693 loff_t upper_limit;
1694 /* This is calculated to be the largest file size for a
cd2291a4 1695 * dense, bitmapped file such that the total number of
ac27a0ec 1696 * sectors in the file, including data and all indirect blocks,
0fc1b451
AK		 1697 * does not exceed 2^48 -1
1698 * __u32 i_blocks_lo and _u16 i_blocks_high representing the
1699 * total number of 512 bytes blocks of the file
1700 */
1701
1702 if (sizeof(blkcnt_t) < sizeof(u64)) {
1703 /*
1704 * CONFIG_LSF is not enabled implies the inode
1705 * i_block represent total blocks in 512 bytes
1706 * 32 == size of vfs inode i_blocks * 8
1707 */
1708 upper_limit = (1LL << 32) - 1;
1709
1710 /* total blocks in file system block size */
1711 upper_limit >>= (bits - 9);
1712
1713 } else {
8180a562
AK		 1714 /*
1715 * We use 48 bit ext4_inode i_blocks
1716 * With EXT4_HUGE_FILE_FL set the i_blocks
1717 * represent total number of blocks in
1718 * file system block size
1719 */
0fc1b451
AK		 1720 upper_limit = (1LL << 48) - 1;
1721
0fc1b451
AK		 1722 }
1723
1724 /* indirect blocks */
1725 meta_blocks = 1;
1726 /* double indirect blocks */
1727 meta_blocks += 1 + (1LL << (bits-2));
1728 /* tripple indirect blocks */
1729 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1730
1731 upper_limit -= meta_blocks;
1732 upper_limit <<= bits;
ac27a0ec
DK		 1733
1734 res += 1LL << (bits-2);
1735 res += 1LL << (2*(bits-2));
1736 res += 1LL << (3*(bits-2));
1737 res <<= bits;
1738 if (res > upper_limit)
1739 res = upper_limit;
0fc1b451
AK		 1740
1741 if (res > MAX_LFS_FILESIZE)
1742 res = MAX_LFS_FILESIZE;
1743
ac27a0ec
DK		 1744 return res;
1745}
1746
617ba13b 1747static ext4_fsblk_t descriptor_loc(struct super_block *sb,
70bbb3e0 1748 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 1749{
617ba13b 1750 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 1751 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 1752 int has_super = 0;
1753
1754 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1755
617ba13b 1756 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 1757 nr < first_meta_bg)
70bbb3e0 1758 return logical_sb_block + nr + 1;
ac27a0ec 1759 bg = sbi->s_desc_per_block * nr;
617ba13b 1760 if (ext4_bg_has_super(sb, bg))
ac27a0ec 1761 has_super = 1;
617ba13b 1762 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 1763}
1764
c9de560d
AT		 1765/**
1766 * ext4_get_stripe_size: Get the stripe size.
1767 * @sbi: In memory super block info
1768 *
1769 * If we have specified it via mount option, then
1770 * use the mount option value. If the value specified at mount time is
1771 * greater than the blocks per group use the super block value.
1772 * If the super block value is greater than blocks per group return 0.
1773 * Allocator needs it be less than blocks per group.
1774 *
1775 */
1776static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
1777{
1778 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
1779 unsigned long stripe_width =
1780 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
1781
1782 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
1783 return sbi->s_stripe;
1784
1785 if (stripe_width <= sbi->s_blocks_per_group)
1786 return stripe_width;
1787
1788 if (stride <= sbi->s_blocks_per_group)
1789 return stride;
1790
1791 return 0;
1792}
ac27a0ec 1793
617ba13b 1794static int ext4_fill_super (struct super_block *sb, void *data, int silent)
1d03ec98
AK		 1795 __releases(kernel_sem)
1796 __acquires(kernel_sem)
1797
ac27a0ec
DK		 1798{
1799 struct buffer_head * bh;
617ba13b
MC		 1800 struct ext4_super_block *es = NULL;
1801 struct ext4_sb_info *sbi;
1802 ext4_fsblk_t block;
1803 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 1804 ext4_fsblk_t logical_sb_block;
ac27a0ec
DK		 1805 unsigned long offset = 0;
1806 unsigned int journal_inum = 0;
1807 unsigned long journal_devnum = 0;
1808 unsigned long def_mount_opts;
1809 struct inode *root;
1810 int blocksize;
1811 int hblock;
1812 int db_count;
1813 int i;
1814 int needs_recovery;
1815 __le32 features;
bd81d8ee 1816 __u64 blocks_count;
833f4077 1817 int err;
ac27a0ec
DK		 1818
1819 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1820 if (!sbi)
1821 return -ENOMEM;
1822 sb->s_fs_info = sbi;
1823 sbi->s_mount_opt = 0;
617ba13b
MC		 1824 sbi->s_resuid = EXT4_DEF_RESUID;
1825 sbi->s_resgid = EXT4_DEF_RESGID;
d9c9bef1 1826 sbi->s_sb_block = sb_block;
ac27a0ec
DK		 1827
1828 unlock_kernel();
1829
617ba13b 1830 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 1831 if (!blocksize) {
617ba13b 1832 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n");
ac27a0ec
DK		 1833 goto out_fail;
1834 }
1835
afc7cbca
TS		 1836 if (!sb_set_blocksize(sb, blocksize)) {
1837 printk(KERN_ERR "EXT4-fs: bad blocksize %d.\n", blocksize);
1838 goto out_fail;
1839 }
1840
ac27a0ec 1841 /*
617ba13b 1842 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 1843 * block sizes. We need to calculate the offset from buffer start.
1844 */
617ba13b 1845 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 1846 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1847 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 1848 } else {
70bbb3e0 1849 logical_sb_block = sb_block;
ac27a0ec
DK		 1850 }
1851
70bbb3e0 1852 if (!(bh = sb_bread(sb, logical_sb_block))) {
617ba13b 1853 printk (KERN_ERR "EXT4-fs: unable to read superblock\n");
ac27a0ec
DK		 1854 goto out_fail;
1855 }
1856 /*
1857 * Note: s_es must be initialized as soon as possible because
617ba13b 1858 * some ext4 macro-instructions depend on its value
ac27a0ec 1859 */
617ba13b 1860 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
ac27a0ec
DK		 1861 sbi->s_es = es;
1862 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 1863 if (sb->s_magic != EXT4_SUPER_MAGIC)
1864 goto cantfind_ext4;
ac27a0ec
DK		 1865
1866 /* Set defaults before we parse the mount options */
1867 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
617ba13b 1868 if (def_mount_opts & EXT4_DEFM_DEBUG)
ac27a0ec 1869 set_opt(sbi->s_mount_opt, DEBUG);
617ba13b 1870 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
ac27a0ec 1871 set_opt(sbi->s_mount_opt, GRPID);
617ba13b 1872 if (def_mount_opts & EXT4_DEFM_UID16)
ac27a0ec 1873 set_opt(sbi->s_mount_opt, NO_UID32);
2e7842b8 1874#ifdef CONFIG_EXT4DEV_FS_XATTR
617ba13b 1875 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
ac27a0ec 1876 set_opt(sbi->s_mount_opt, XATTR_USER);
2e7842b8
HD		 1877#endif
1878#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
617ba13b 1879 if (def_mount_opts & EXT4_DEFM_ACL)
ac27a0ec 1880 set_opt(sbi->s_mount_opt, POSIX_ACL);
2e7842b8 1881#endif
617ba13b
MC		 1882 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
1883 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
1884 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
1885 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
1886 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
1887 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
1888
1889 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
ac27a0ec 1890 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
bb4f397a 1891 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
ceea16bf 1892 set_opt(sbi->s_mount_opt, ERRORS_CONT);
bb4f397a
AK		 1893 else
1894 set_opt(sbi->s_mount_opt, ERRORS_RO);
ac27a0ec
DK		 1895
1896 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1897 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1898
1899 set_opt(sbi->s_mount_opt, RESERVATION);
1900
1e2462f9
MC		 1901 /*
1902 * turn on extents feature by default in ext4 filesystem
1903 * User -o noextents to turn it off
1904 */
1905 set_opt(sbi->s_mount_opt, EXTENTS);
1906
ac27a0ec
DK		 1907 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1908 NULL, 0))
1909 goto failed_mount;
1910
1911 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
617ba13b 1912 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 1913
617ba13b
MC		 1914 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
1915 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
1916 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1917 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
ac27a0ec 1918 printk(KERN_WARNING
617ba13b 1919 "EXT4-fs warning: feature flags set on rev 0 fs, "
ac27a0ec
DK		 1920 "running e2fsck is recommended\n");
1921 /*
1922 * Check feature flags regardless of the revision level, since we
1923 * previously didn't change the revision level when setting the flags,
1924 * so there is a chance incompat flags are set on a rev 0 filesystem.
1925 */
617ba13b 1926 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
ac27a0ec 1927 if (features) {
617ba13b 1928 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of "
ac27a0ec
DK		 1929 "unsupported optional features (%x).\n",
1930 sb->s_id, le32_to_cpu(features));
1931 goto failed_mount;
1932 }
617ba13b 1933 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
ac27a0ec 1934 if (!(sb->s_flags & MS_RDONLY) && features) {
617ba13b 1935 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of "
ac27a0ec
DK		 1936 "unsupported optional features (%x).\n",
1937 sb->s_id, le32_to_cpu(features));
1938 goto failed_mount;
1939 }
0fc1b451
AK		 1940 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
1941 /*
1942 * Large file size enabled file system can only be
1943 * mount if kernel is build with CONFIG_LSF
1944 */
1945 if (sizeof(root->i_blocks) < sizeof(u64) &&
1946 !(sb->s_flags & MS_RDONLY)) {
1947 printk(KERN_ERR "EXT4-fs: %s: Filesystem with huge "
1948 "files cannot be mounted read-write "
1949 "without CONFIG_LSF.\n", sb->s_id);
1950 goto failed_mount;
1951 }
1952 }
ac27a0ec
DK		 1953 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1954
617ba13b
MC		 1955 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
1956 blocksize > EXT4_MAX_BLOCK_SIZE) {
ac27a0ec 1957 printk(KERN_ERR
617ba13b 1958 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
ac27a0ec
DK		 1959 blocksize, sb->s_id);
1960 goto failed_mount;
1961 }
1962
1963 hblock = bdev_hardsect_size(sb->s_bdev);
1964 if (sb->s_blocksize != blocksize) {
1965 /*
1966 * Make sure the blocksize for the filesystem is larger
1967 * than the hardware sectorsize for the machine.
1968 */
1969 if (blocksize < hblock) {
617ba13b 1970 printk(KERN_ERR "EXT4-fs: blocksize %d too small for "
ac27a0ec
DK		 1971 "device blocksize %d.\n", blocksize, hblock);
1972 goto failed_mount;
1973 }
1974
1975 brelse (bh);
1976 sb_set_blocksize(sb, blocksize);
70bbb3e0
AM		 1977 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1978 offset = do_div(logical_sb_block, blocksize);
1979 bh = sb_bread(sb, logical_sb_block);
ac27a0ec
DK		 1980 if (!bh) {
1981 printk(KERN_ERR
617ba13b 1982 "EXT4-fs: Can't read superblock on 2nd try.\n");
ac27a0ec
DK		 1983 goto failed_mount;
1984 }
617ba13b 1985 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
ac27a0ec 1986 sbi->s_es = es;
617ba13b 1987 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
ac27a0ec 1988 printk (KERN_ERR
617ba13b 1989 "EXT4-fs: Magic mismatch, very weird !\n");
ac27a0ec
DK		 1990 goto failed_mount;
1991 }
1992 }
1993
e2b46574 1994 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits);
617ba13b 1995 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits);
ac27a0ec 1996
617ba13b
MC		 1997 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
1998 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
1999 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 2000 } else {
2001 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
2002 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 2003 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 2004 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec
DK		 2005 (sbi->s_inode_size > blocksize)) {
2006 printk (KERN_ERR
617ba13b 2007 "EXT4-fs: unsupported inode size: %d\n",
ac27a0ec
DK		 2008 sbi->s_inode_size);
2009 goto failed_mount;
2010 }
ef7f3835
KS		 2011 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
2012 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 2013 }
0d1ee42f
AR		 2014 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
2015 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 2016 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 2017 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 2018 !is_power_of_2(sbi->s_desc_size)) {
0d1ee42f 2019 printk(KERN_ERR
8fadc143 2020 "EXT4-fs: unsupported descriptor size %lu\n",
0d1ee42f
AR		 2021 sbi->s_desc_size);
2022 goto failed_mount;
2023 }
2024 } else
2025 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
ac27a0ec 2026 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 2027 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 2028 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b
MC		 2029 goto cantfind_ext4;
2030 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 2031 if (sbi->s_inodes_per_block == 0)
617ba13b 2032 goto cantfind_ext4;
ac27a0ec
DK		 2033 sbi->s_itb_per_group = sbi->s_inodes_per_group /
2034 sbi->s_inodes_per_block;
0d1ee42f 2035 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 2036 sbi->s_sbh = bh;
2037 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 2038 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
2039 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
ac27a0ec
DK		 2040 for (i=0; i < 4; i++)
2041 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
2042 sbi->s_def_hash_version = es->s_def_hash_version;
2043
2044 if (sbi->s_blocks_per_group > blocksize * 8) {
2045 printk (KERN_ERR
617ba13b 2046 "EXT4-fs: #blocks per group too big: %lu\n",
ac27a0ec
DK		 2047 sbi->s_blocks_per_group);
2048 goto failed_mount;
2049 }
ac27a0ec
DK		 2050 if (sbi->s_inodes_per_group > blocksize * 8) {
2051 printk (KERN_ERR
617ba13b 2052 "EXT4-fs: #inodes per group too big: %lu\n",
ac27a0ec
DK		 2053 sbi->s_inodes_per_group);
2054 goto failed_mount;
2055 }
2056
bd81d8ee 2057 if (ext4_blocks_count(es) >
ac27a0ec 2058 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
617ba13b 2059 printk(KERN_ERR "EXT4-fs: filesystem on %s:"
ac27a0ec
DK		 2060 " too large to mount safely\n", sb->s_id);
2061 if (sizeof(sector_t) < 8)
617ba13b 2062 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not "
ac27a0ec
DK		 2063 "enabled\n");
2064 goto failed_mount;
2065 }
2066
617ba13b
MC		 2067 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
2068 goto cantfind_ext4;
e7c95593
ES		 2069
2070 /* ensure blocks_count calculation below doesn't sign-extend */
2071 if (ext4_blocks_count(es) + EXT4_BLOCKS_PER_GROUP(sb) <
2072 le32_to_cpu(es->s_first_data_block) + 1) {
2073 printk(KERN_WARNING "EXT4-fs: bad geometry: block count %llu, "
2074 "first data block %u, blocks per group %lu\n",
2075 ext4_blocks_count(es),
2076 le32_to_cpu(es->s_first_data_block),
2077 EXT4_BLOCKS_PER_GROUP(sb));
2078 goto failed_mount;
2079 }
bd81d8ee
LV		 2080 blocks_count = (ext4_blocks_count(es) -
2081 le32_to_cpu(es->s_first_data_block) +
2082 EXT4_BLOCKS_PER_GROUP(sb) - 1);
2083 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
2084 sbi->s_groups_count = blocks_count;
617ba13b
MC		 2085 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
2086 EXT4_DESC_PER_BLOCK(sb);
ac27a0ec
DK		 2087 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
2088 GFP_KERNEL);
2089 if (sbi->s_group_desc == NULL) {
617ba13b 2090 printk (KERN_ERR "EXT4-fs: not enough memory\n");
ac27a0ec
DK		 2091 goto failed_mount;
2092 }
2093
2094 bgl_lock_init(&sbi->s_blockgroup_lock);
2095
2096 for (i = 0; i < db_count; i++) {
70bbb3e0 2097 block = descriptor_loc(sb, logical_sb_block, i);
ac27a0ec
DK		 2098 sbi->s_group_desc[i] = sb_bread(sb, block);
2099 if (!sbi->s_group_desc[i]) {
617ba13b 2100 printk (KERN_ERR "EXT4-fs: "
ac27a0ec
DK		 2101 "can't read group descriptor %d\n", i);
2102 db_count = i;
2103 goto failed_mount2;
2104 }
2105 }
617ba13b
MC		 2106 if (!ext4_check_descriptors (sb)) {
2107 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
ac27a0ec
DK		 2108 goto failed_mount2;
2109 }
2110 sbi->s_gdb_count = db_count;
2111 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
2112 spin_lock_init(&sbi->s_next_gen_lock);
2113
833f4077
PZ		 2114 err = percpu_counter_init(&sbi->s_freeblocks_counter,
2115 ext4_count_free_blocks(sb));
2116 if (!err) {
2117 err = percpu_counter_init(&sbi->s_freeinodes_counter,
2118 ext4_count_free_inodes(sb));
2119 }
2120 if (!err) {
2121 err = percpu_counter_init(&sbi->s_dirs_counter,
2122 ext4_count_dirs(sb));
2123 }
2124 if (err) {
2125 printk(KERN_ERR "EXT4-fs: insufficient memory\n");
2126 goto failed_mount3;
2127 }
ac27a0ec
DK		 2128
2129 /* per fileystem reservation list head & lock */
2130 spin_lock_init(&sbi->s_rsv_window_lock);
2131 sbi->s_rsv_window_root = RB_ROOT;
2132 /* Add a single, static dummy reservation to the start of the
2133 * reservation window list --- it gives us a placeholder for
2134 * append-at-start-of-list which makes the allocation logic
2135 * _much_ simpler. */
617ba13b
MC		 2136 sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
2137 sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
ac27a0ec
DK		 2138 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
2139 sbi->s_rsv_window_head.rsv_goal_size = 0;
617ba13b 2140 ext4_rsv_window_add(sb, &sbi->s_rsv_window_head);
ac27a0ec 2141
c9de560d
AT		 2142 sbi->s_stripe = ext4_get_stripe_size(sbi);
2143
ac27a0ec
DK		 2144 /*
2145 * set up enough so that it can read an inode
2146 */
617ba13b
MC		 2147 sb->s_op = &ext4_sops;
2148 sb->s_export_op = &ext4_export_ops;
2149 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 2150#ifdef CONFIG_QUOTA
617ba13b
MC		 2151 sb->s_qcop = &ext4_qctl_operations;
2152 sb->dq_op = &ext4_quota_operations;
ac27a0ec
DK		 2153#endif
2154 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
2155
2156 sb->s_root = NULL;
2157
2158 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 2159 EXT4_HAS_INCOMPAT_FEATURE(sb,
2160 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec
DK		 2161
2162 /*
2163 * The first inode we look at is the journal inode. Don't try
2164 * root first: it may be modified in the journal!
2165 */
2166 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 2167 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
2168 if (ext4_load_journal(sb, es, journal_devnum))
ac27a0ec
DK		 2169 goto failed_mount3;
2170 } else if (journal_inum) {
617ba13b 2171 if (ext4_create_journal(sb, es, journal_inum))
ac27a0ec
DK		 2172 goto failed_mount3;
2173 } else {
2174 if (!silent)
2175 printk (KERN_ERR
617ba13b 2176 "ext4: No journal on filesystem on %s\n",
ac27a0ec
DK		 2177 sb->s_id);
2178 goto failed_mount3;
2179 }
2180
eb40a09c
JS		 2181 if (ext4_blocks_count(es) > 0xffffffffULL &&
2182 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
2183 JBD2_FEATURE_INCOMPAT_64BIT)) {
2184 printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n");
2185 goto failed_mount4;
2186 }
2187
818d276c
GS		 2188 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2189 jbd2_journal_set_features(sbi->s_journal,
2190 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2191 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2192 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2193 jbd2_journal_set_features(sbi->s_journal,
2194 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
2195 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2196 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2197 } else {
2198 jbd2_journal_clear_features(sbi->s_journal,
2199 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2200 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2201 }
2202
ac27a0ec
DK		 2203 /* We have now updated the journal if required, so we can
2204 * validate the data journaling mode. */
2205 switch (test_opt(sb, DATA_FLAGS)) {
2206 case 0:
2207 /* No mode set, assume a default based on the journal
63f57933
AM		 2208 * capabilities: ORDERED_DATA if the journal can
2209 * cope, else JOURNAL_DATA
2210 */
dab291af
MC		 2211 if (jbd2_journal_check_available_features
2212 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
ac27a0ec
DK		 2213 set_opt(sbi->s_mount_opt, ORDERED_DATA);
2214 else
2215 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2216 break;
2217
617ba13b
MC		 2218 case EXT4_MOUNT_ORDERED_DATA:
2219 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 2220 if (!jbd2_journal_check_available_features
2221 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
617ba13b 2222 printk(KERN_ERR "EXT4-fs: Journal does not support "
ac27a0ec
DK		 2223 "requested data journaling mode\n");
2224 goto failed_mount4;
2225 }
2226 default:
2227 break;
2228 }
2229
2230 if (test_opt(sb, NOBH)) {
617ba13b
MC		 2231 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
2232 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - "
ac27a0ec
DK		 2233 "its supported only with writeback mode\n");
2234 clear_opt(sbi->s_mount_opt, NOBH);
2235 }
2236 }
2237 /*
dab291af 2238 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 2239 * so we can safely mount the rest of the filesystem now.
2240 */
2241
617ba13b 2242 root = iget(sb, EXT4_ROOT_INO);
ac27a0ec
DK		 2243 sb->s_root = d_alloc_root(root);
2244 if (!sb->s_root) {
617ba13b 2245 printk(KERN_ERR "EXT4-fs: get root inode failed\n");
ac27a0ec
DK		 2246 iput(root);
2247 goto failed_mount4;
2248 }
2249 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
2250 dput(sb->s_root);
2251 sb->s_root = NULL;
617ba13b 2252 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
ac27a0ec
DK		 2253 goto failed_mount4;
2254 }
2255
617ba13b 2256 ext4_setup_super (sb, es, sb->s_flags & MS_RDONLY);
ef7f3835
KS		 2257
2258 /* determine the minimum size of new large inodes, if present */
2259 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
2260 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2261 EXT4_GOOD_OLD_INODE_SIZE;
2262 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2263 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2264 if (sbi->s_want_extra_isize <
2265 le16_to_cpu(es->s_want_extra_isize))
2266 sbi->s_want_extra_isize =
2267 le16_to_cpu(es->s_want_extra_isize);
2268 if (sbi->s_want_extra_isize <
2269 le16_to_cpu(es->s_min_extra_isize))
2270 sbi->s_want_extra_isize =
2271 le16_to_cpu(es->s_min_extra_isize);
2272 }
2273 }
2274 /* Check if enough inode space is available */
2275 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2276 sbi->s_inode_size) {
2277 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2278 EXT4_GOOD_OLD_INODE_SIZE;
2279 printk(KERN_INFO "EXT4-fs: required extra inode space not"
2280 "available.\n");
2281 }
2282
ac27a0ec
DK		 2283 /*
2284 * akpm: core read_super() calls in here with the superblock locked.
2285 * That deadlocks, because orphan cleanup needs to lock the superblock
2286 * in numerous places. Here we just pop the lock - it's relatively
2287 * harmless, because we are now ready to accept write_super() requests,
2288 * and aviro says that's the only reason for hanging onto the
2289 * superblock lock.
2290 */
617ba13b
MC		 2291 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
2292 ext4_orphan_cleanup(sb, es);
2293 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
ac27a0ec 2294 if (needs_recovery)
617ba13b
MC		 2295 printk (KERN_INFO "EXT4-fs: recovery complete.\n");
2296 ext4_mark_recovery_complete(sb, es);
2297 printk (KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n",
2298 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal":
2299 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered":
ac27a0ec
DK		 2300 "writeback");
2301
a86c6181 2302 ext4_ext_init(sb);
c9de560d 2303 ext4_mb_init(sb, needs_recovery);
a86c6181 2304
ac27a0ec
DK		 2305 lock_kernel();
2306 return 0;
2307
617ba13b 2308cantfind_ext4:
ac27a0ec 2309 if (!silent)
617ba13b 2310 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n",
ac27a0ec
DK		 2311 sb->s_id);
2312 goto failed_mount;
2313
2314failed_mount4:
dab291af 2315 jbd2_journal_destroy(sbi->s_journal);
ac27a0ec
DK		 2316failed_mount3:
2317 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2318 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2319 percpu_counter_destroy(&sbi->s_dirs_counter);
2320failed_mount2:
2321 for (i = 0; i < db_count; i++)
2322 brelse(sbi->s_group_desc[i]);
2323 kfree(sbi->s_group_desc);
2324failed_mount:
2325#ifdef CONFIG_QUOTA
2326 for (i = 0; i < MAXQUOTAS; i++)
2327 kfree(sbi->s_qf_names[i]);
2328#endif
617ba13b 2329 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 2330 brelse(bh);
2331out_fail:
2332 sb->s_fs_info = NULL;
2333 kfree(sbi);
2334 lock_kernel();
2335 return -EINVAL;
2336}
2337
2338/*
2339 * Setup any per-fs journal parameters now. We'll do this both on
2340 * initial mount, once the journal has been initialised but before we've
2341 * done any recovery; and again on any subsequent remount.
2342 */
617ba13b 2343static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 2344{
617ba13b 2345 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 2346
2347 if (sbi->s_commit_interval)
2348 journal->j_commit_interval = sbi->s_commit_interval;
617ba13b 2349 /* We could also set up an ext4-specific default for the commit
ac27a0ec
DK		 2350 * interval here, but for now we'll just fall back to the jbd
2351 * default. */
2352
2353 spin_lock(&journal->j_state_lock);
2354 if (test_opt(sb, BARRIER))
dab291af 2355 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 2356 else
dab291af 2357 journal->j_flags &= ~JBD2_BARRIER;
ac27a0ec
DK		 2358 spin_unlock(&journal->j_state_lock);
2359}
2360
617ba13b 2361static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 2362 unsigned int journal_inum)
2363{
2364 struct inode *journal_inode;
2365 journal_t *journal;
2366
2367 /* First, test for the existence of a valid inode on disk. Bad
2368 * things happen if we iget() an unused inode, as the subsequent
2369 * iput() will try to delete it. */
2370
2371 journal_inode = iget(sb, journal_inum);
2372 if (!journal_inode) {
617ba13b 2373 printk(KERN_ERR "EXT4-fs: no journal found.\n");
ac27a0ec
DK		 2374 return NULL;
2375 }
2376 if (!journal_inode->i_nlink) {
2377 make_bad_inode(journal_inode);
2378 iput(journal_inode);
617ba13b 2379 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n");
ac27a0ec
DK		 2380 return NULL;
2381 }
2382
2383 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2384 journal_inode, journal_inode->i_size);
2385 if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
617ba13b 2386 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
ac27a0ec
DK		 2387 iput(journal_inode);
2388 return NULL;
2389 }
2390
dab291af 2391 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 2392 if (!journal) {
617ba13b 2393 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n");
ac27a0ec
DK		 2394 iput(journal_inode);
2395 return NULL;
2396 }
2397 journal->j_private = sb;
617ba13b 2398 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 2399 return journal;
2400}
2401
617ba13b 2402static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 2403 dev_t j_dev)
2404{
2405 struct buffer_head * bh;
2406 journal_t *journal;
617ba13b
MC		 2407 ext4_fsblk_t start;
2408 ext4_fsblk_t len;
ac27a0ec 2409 int hblock, blocksize;
617ba13b 2410 ext4_fsblk_t sb_block;
ac27a0ec 2411 unsigned long offset;
617ba13b 2412 struct ext4_super_block * es;
ac27a0ec
DK		 2413 struct block_device *bdev;
2414
617ba13b 2415 bdev = ext4_blkdev_get(j_dev);
ac27a0ec
DK		 2416 if (bdev == NULL)
2417 return NULL;
2418
2419 if (bd_claim(bdev, sb)) {
2420 printk(KERN_ERR
8c55e204 2421 "EXT4: failed to claim external journal device.\n");
ac27a0ec
DK		 2422 blkdev_put(bdev);
2423 return NULL;
2424 }
2425
2426 blocksize = sb->s_blocksize;
2427 hblock = bdev_hardsect_size(bdev);
2428 if (blocksize < hblock) {
2429 printk(KERN_ERR
617ba13b 2430 "EXT4-fs: blocksize too small for journal device.\n");
ac27a0ec
DK		 2431 goto out_bdev;
2432 }
2433
617ba13b
MC		 2434 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
2435 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 2436 set_blocksize(bdev, blocksize);
2437 if (!(bh = __bread(bdev, sb_block, blocksize))) {
617ba13b 2438 printk(KERN_ERR "EXT4-fs: couldn't read superblock of "
ac27a0ec
DK		 2439 "external journal\n");
2440 goto out_bdev;
2441 }
2442
617ba13b
MC		 2443 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2444 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 2445 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b
MC		 2446 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2447 printk(KERN_ERR "EXT4-fs: external journal has "
ac27a0ec
DK		 2448 "bad superblock\n");
2449 brelse(bh);
2450 goto out_bdev;
2451 }
2452
617ba13b
MC		 2453 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2454 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n");
ac27a0ec
DK		 2455 brelse(bh);
2456 goto out_bdev;
2457 }
2458
bd81d8ee 2459 len = ext4_blocks_count(es);
ac27a0ec
DK		 2460 start = sb_block + 1;
2461 brelse(bh); /* we're done with the superblock */
2462
dab291af 2463 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 2464 start, len, blocksize);
2465 if (!journal) {
617ba13b 2466 printk(KERN_ERR "EXT4-fs: failed to create device journal\n");
ac27a0ec
DK		 2467 goto out_bdev;
2468 }
2469 journal->j_private = sb;
2470 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2471 wait_on_buffer(journal->j_sb_buffer);
2472 if (!buffer_uptodate(journal->j_sb_buffer)) {
617ba13b 2473 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n");
ac27a0ec
DK		 2474 goto out_journal;
2475 }
2476 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
617ba13b 2477 printk(KERN_ERR "EXT4-fs: External journal has more than one "
ac27a0ec
DK		 2478 "user (unsupported) - %d\n",
2479 be32_to_cpu(journal->j_superblock->s_nr_users));
2480 goto out_journal;
2481 }
617ba13b
MC		 2482 EXT4_SB(sb)->journal_bdev = bdev;
2483 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 2484 return journal;
2485out_journal:
dab291af 2486 jbd2_journal_destroy(journal);
ac27a0ec 2487out_bdev:
617ba13b 2488 ext4_blkdev_put(bdev);
ac27a0ec
DK		 2489 return NULL;
2490}
2491
617ba13b
MC		 2492static int ext4_load_journal(struct super_block *sb,
2493 struct ext4_super_block *es,
ac27a0ec
DK		 2494 unsigned long journal_devnum)
2495{
2496 journal_t *journal;
2497 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2498 dev_t journal_dev;
2499 int err = 0;
2500 int really_read_only;
2501
2502 if (journal_devnum &&
2503 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
617ba13b 2504 printk(KERN_INFO "EXT4-fs: external journal device major/minor "
ac27a0ec
DK		 2505 "numbers have changed\n");
2506 journal_dev = new_decode_dev(journal_devnum);
2507 } else
2508 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2509
2510 really_read_only = bdev_read_only(sb->s_bdev);
2511
2512 /*
2513 * Are we loading a blank journal or performing recovery after a
2514 * crash? For recovery, we need to check in advance whether we
2515 * can get read-write access to the device.
2516 */
2517
617ba13b 2518 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 2519 if (sb->s_flags & MS_RDONLY) {
617ba13b 2520 printk(KERN_INFO "EXT4-fs: INFO: recovery "
ac27a0ec
DK		 2521 "required on readonly filesystem.\n");
2522 if (really_read_only) {
617ba13b 2523 printk(KERN_ERR "EXT4-fs: write access "
ac27a0ec
DK		 2524 "unavailable, cannot proceed.\n");
2525 return -EROFS;
2526 }
617ba13b 2527 printk (KERN_INFO "EXT4-fs: write access will "
ac27a0ec
DK		 2528 "be enabled during recovery.\n");
2529 }
2530 }
2531
2532 if (journal_inum && journal_dev) {
617ba13b 2533 printk(KERN_ERR "EXT4-fs: filesystem has both journal "
ac27a0ec
DK		 2534 "and inode journals!\n");
2535 return -EINVAL;
2536 }
2537
2538 if (journal_inum) {
617ba13b 2539 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 2540 return -EINVAL;
2541 } else {
617ba13b 2542 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 2543 return -EINVAL;
2544 }
2545
2546 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
dab291af 2547 err = jbd2_journal_update_format(journal);
ac27a0ec 2548 if (err) {
617ba13b 2549 printk(KERN_ERR "EXT4-fs: error updating journal.\n");
dab291af 2550 jbd2_journal_destroy(journal);
ac27a0ec
DK		 2551 return err;
2552 }
2553 }
2554
617ba13b 2555 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 2556 err = jbd2_journal_wipe(journal, !really_read_only);
ac27a0ec 2557 if (!err)
dab291af 2558 err = jbd2_journal_load(journal);
ac27a0ec
DK		 2559
2560 if (err) {
617ba13b 2561 printk(KERN_ERR "EXT4-fs: error loading journal.\n");
dab291af 2562 jbd2_journal_destroy(journal);
ac27a0ec
DK		 2563 return err;
2564 }
2565
617ba13b
MC		 2566 EXT4_SB(sb)->s_journal = journal;
2567 ext4_clear_journal_err(sb, es);
ac27a0ec
DK		 2568
2569 if (journal_devnum &&
2570 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2571 es->s_journal_dev = cpu_to_le32(journal_devnum);
2572 sb->s_dirt = 1;
2573
2574 /* Make sure we flush the recovery flag to disk. */
617ba13b 2575 ext4_commit_super(sb, es, 1);
ac27a0ec
DK		 2576 }
2577
2578 return 0;
2579}
2580
617ba13b
MC		 2581static int ext4_create_journal(struct super_block * sb,
2582 struct ext4_super_block * es,
ac27a0ec
DK		 2583 unsigned int journal_inum)
2584{
2585 journal_t *journal;
6c675bd4 2586 int err;
ac27a0ec
DK		 2587
2588 if (sb->s_flags & MS_RDONLY) {
617ba13b 2589 printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to "
ac27a0ec
DK		 2590 "create journal.\n");
2591 return -EROFS;
2592 }
2593
6c675bd4
BP		 2594 journal = ext4_get_journal(sb, journal_inum);
2595 if (!journal)
ac27a0ec
DK		 2596 return -EINVAL;
2597
617ba13b 2598 printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n",
ac27a0ec
DK		 2599 journal_inum);
2600
6c675bd4
BP		 2601 err = jbd2_journal_create(journal);
2602 if (err) {
617ba13b 2603 printk(KERN_ERR "EXT4-fs: error creating journal.\n");
dab291af 2604 jbd2_journal_destroy(journal);
ac27a0ec
DK		 2605 return -EIO;
2606 }
2607
617ba13b 2608 EXT4_SB(sb)->s_journal = journal;
ac27a0ec 2609
617ba13b
MC		 2610 ext4_update_dynamic_rev(sb);
2611 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2612 EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL);
ac27a0ec
DK		 2613
2614 es->s_journal_inum = cpu_to_le32(journal_inum);
2615 sb->s_dirt = 1;
2616
2617 /* Make sure we flush the recovery flag to disk. */
617ba13b 2618 ext4_commit_super(sb, es, 1);
ac27a0ec
DK		 2619
2620 return 0;
2621}
2622
617ba13b
MC		 2623static void ext4_commit_super (struct super_block * sb,
2624 struct ext4_super_block * es,
ac27a0ec
DK		 2625 int sync)
2626{
617ba13b 2627 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
ac27a0ec
DK		 2628
2629 if (!sbh)
2630 return;
2631 es->s_wtime = cpu_to_le32(get_seconds());
bd81d8ee 2632 ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb));
617ba13b 2633 es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 2634 BUFFER_TRACE(sbh, "marking dirty");
2635 mark_buffer_dirty(sbh);
2636 if (sync)
2637 sync_dirty_buffer(sbh);
2638}
2639
2640
2641/*
2642 * Have we just finished recovery? If so, and if we are mounting (or
2643 * remounting) the filesystem readonly, then we will end up with a
2644 * consistent fs on disk. Record that fact.
2645 */
617ba13b
MC		 2646static void ext4_mark_recovery_complete(struct super_block * sb,
2647 struct ext4_super_block * es)
ac27a0ec 2648{
617ba13b 2649 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 2650
dab291af
MC		 2651 jbd2_journal_lock_updates(journal);
2652 jbd2_journal_flush(journal);
32c37730 2653 lock_super(sb);
617ba13b 2654 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 2655 sb->s_flags & MS_RDONLY) {
617ba13b 2656 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 2657 sb->s_dirt = 0;
617ba13b 2658 ext4_commit_super(sb, es, 1);
ac27a0ec 2659 }
32c37730 2660 unlock_super(sb);
dab291af 2661 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 2662}
2663
2664/*
2665 * If we are mounting (or read-write remounting) a filesystem whose journal
2666 * has recorded an error from a previous lifetime, move that error to the
2667 * main filesystem now.
2668 */
617ba13b
MC		 2669static void ext4_clear_journal_err(struct super_block * sb,
2670 struct ext4_super_block * es)
ac27a0ec
DK		 2671{
2672 journal_t *journal;
2673 int j_errno;
2674 const char *errstr;
2675
617ba13b 2676 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 2677
2678 /*
2679 * Now check for any error status which may have been recorded in the
617ba13b 2680 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 2681 */
2682
dab291af 2683 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 2684 if (j_errno) {
2685 char nbuf[16];
2686
617ba13b
MC		 2687 errstr = ext4_decode_error(sb, j_errno, nbuf);
2688 ext4_warning(sb, __FUNCTION__, "Filesystem error recorded "
ac27a0ec 2689 "from previous mount: %s", errstr);
617ba13b 2690 ext4_warning(sb, __FUNCTION__, "Marking fs in need of "
ac27a0ec
DK		 2691 "filesystem check.");
2692
617ba13b
MC		 2693 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2694 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2695 ext4_commit_super (sb, es, 1);
ac27a0ec 2696
dab291af 2697 jbd2_journal_clear_err(journal);
ac27a0ec
DK		 2698 }
2699}
2700
2701/*
2702 * Force the running and committing transactions to commit,
2703 * and wait on the commit.
2704 */
617ba13b 2705int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 2706{
2707 journal_t *journal;
2708 int ret;
2709
2710 if (sb->s_flags & MS_RDONLY)
2711 return 0;
2712
617ba13b 2713 journal = EXT4_SB(sb)->s_journal;
ac27a0ec 2714 sb->s_dirt = 0;
617ba13b 2715 ret = ext4_journal_force_commit(journal);
ac27a0ec
DK		 2716 return ret;
2717}
2718
2719/*
617ba13b 2720 * Ext4 always journals updates to the superblock itself, so we don't
ac27a0ec
DK		 2721 * have to propagate any other updates to the superblock on disk at this
2722 * point. Just start an async writeback to get the buffers on their way
2723 * to the disk.
2724 *
2725 * This implicitly triggers the writebehind on sync().
2726 */
2727
617ba13b 2728static void ext4_write_super (struct super_block * sb)
ac27a0ec
DK		 2729{
2730 if (mutex_trylock(&sb->s_lock) != 0)
2731 BUG();
2732 sb->s_dirt = 0;
2733}
2734
617ba13b 2735static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec
DK		 2736{
2737 tid_t target;
2738
2739 sb->s_dirt = 0;
dab291af 2740 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) {
ac27a0ec 2741 if (wait)
dab291af 2742 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target);
ac27a0ec
DK		 2743 }
2744 return 0;
2745}
2746
2747/*
2748 * LVM calls this function before a (read-only) snapshot is created. This
2749 * gives us a chance to flush the journal completely and mark the fs clean.
2750 */
617ba13b 2751static void ext4_write_super_lockfs(struct super_block *sb)
ac27a0ec
DK		 2752{
2753 sb->s_dirt = 0;
2754
2755 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 2756 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 2757
2758 /* Now we set up the journal barrier. */
dab291af
MC		 2759 jbd2_journal_lock_updates(journal);
2760 jbd2_journal_flush(journal);
ac27a0ec
DK		 2761
2762 /* Journal blocked and flushed, clear needs_recovery flag. */
617ba13b
MC		 2763 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2764 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
ac27a0ec
DK		 2765 }
2766}
2767
2768/*
2769 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2770 * flag here, even though the filesystem is not technically dirty yet.
2771 */
617ba13b 2772static void ext4_unlockfs(struct super_block *sb)
ac27a0ec
DK		 2773{
2774 if (!(sb->s_flags & MS_RDONLY)) {
2775 lock_super(sb);
2776 /* Reser the needs_recovery flag before the fs is unlocked. */
617ba13b
MC		 2777 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2778 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
ac27a0ec 2779 unlock_super(sb);
dab291af 2780 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
ac27a0ec
DK		 2781 }
2782}
2783
617ba13b 2784static int ext4_remount (struct super_block * sb, int * flags, char * data)
ac27a0ec 2785{
617ba13b
MC		 2786 struct ext4_super_block * es;
2787 struct ext4_sb_info *sbi = EXT4_SB(sb);
2788 ext4_fsblk_t n_blocks_count = 0;
ac27a0ec 2789 unsigned long old_sb_flags;
617ba13b 2790 struct ext4_mount_options old_opts;
ac27a0ec
DK		 2791 int err;
2792#ifdef CONFIG_QUOTA
2793 int i;
2794#endif
2795
2796 /* Store the original options */
2797 old_sb_flags = sb->s_flags;
2798 old_opts.s_mount_opt = sbi->s_mount_opt;
2799 old_opts.s_resuid = sbi->s_resuid;
2800 old_opts.s_resgid = sbi->s_resgid;
2801 old_opts.s_commit_interval = sbi->s_commit_interval;
2802#ifdef CONFIG_QUOTA
2803 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2804 for (i = 0; i < MAXQUOTAS; i++)
2805 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2806#endif
2807
2808 /*
2809 * Allow the "check" option to be passed as a remount option.
2810 */
2811 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2812 err = -EINVAL;
2813 goto restore_opts;
2814 }
2815
617ba13b
MC		 2816 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT)
2817 ext4_abort(sb, __FUNCTION__, "Abort forced by user");
ac27a0ec
DK		 2818
2819 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
617ba13b 2820 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 2821
2822 es = sbi->s_es;
2823
617ba13b 2824 ext4_init_journal_params(sb, sbi->s_journal);
ac27a0ec
DK		 2825
2826 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
bd81d8ee 2827 n_blocks_count > ext4_blocks_count(es)) {
617ba13b 2828 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
ac27a0ec
DK		 2829 err = -EROFS;
2830 goto restore_opts;
2831 }
2832
2833 if (*flags & MS_RDONLY) {
2834 /*
2835 * First of all, the unconditional stuff we have to do
2836 * to disable replay of the journal when we next remount
2837 */
2838 sb->s_flags |= MS_RDONLY;
2839
2840 /*
2841 * OK, test if we are remounting a valid rw partition
2842 * readonly, and if so set the rdonly flag and then
2843 * mark the partition as valid again.
2844 */
617ba13b
MC		 2845 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
2846 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 2847 es->s_state = cpu_to_le16(sbi->s_mount_state);
2848
32c37730
JK		 2849 /*
2850 * We have to unlock super so that we can wait for
2851 * transactions.
2852 */
2853 unlock_super(sb);
617ba13b 2854 ext4_mark_recovery_complete(sb, es);
32c37730 2855 lock_super(sb);
ac27a0ec
DK		 2856 } else {
2857 __le32 ret;
617ba13b
MC		 2858 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
2859 ~EXT4_FEATURE_RO_COMPAT_SUPP))) {
2860 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
ac27a0ec
DK		 2861 "remount RDWR because of unsupported "
2862 "optional features (%x).\n",
2863 sb->s_id, le32_to_cpu(ret));
2864 err = -EROFS;
2865 goto restore_opts;
2866 }
ead6596b
ES		 2867
2868 /*
2869 * If we have an unprocessed orphan list hanging
2870 * around from a previously readonly bdev mount,
2871 * require a full umount/remount for now.
2872 */
2873 if (es->s_last_orphan) {
2874 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
2875 "remount RDWR because of unprocessed "
2876 "orphan inode list. Please "
2877 "umount/remount instead.\n",
2878 sb->s_id);
2879 err = -EINVAL;
2880 goto restore_opts;
2881 }
2882
ac27a0ec
DK		 2883 /*
2884 * Mounting a RDONLY partition read-write, so reread
2885 * and store the current valid flag. (It may have
2886 * been changed by e2fsck since we originally mounted
2887 * the partition.)
2888 */
617ba13b 2889 ext4_clear_journal_err(sb, es);
ac27a0ec 2890 sbi->s_mount_state = le16_to_cpu(es->s_state);
617ba13b 2891 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
ac27a0ec 2892 goto restore_opts;
617ba13b 2893 if (!ext4_setup_super (sb, es, 0))
ac27a0ec
DK		 2894 sb->s_flags &= ~MS_RDONLY;
2895 }
2896 }
2897#ifdef CONFIG_QUOTA
2898 /* Release old quota file names */
2899 for (i = 0; i < MAXQUOTAS; i++)
2900 if (old_opts.s_qf_names[i] &&
2901 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2902 kfree(old_opts.s_qf_names[i]);
2903#endif
2904 return 0;
2905restore_opts:
2906 sb->s_flags = old_sb_flags;
2907 sbi->s_mount_opt = old_opts.s_mount_opt;
2908 sbi->s_resuid = old_opts.s_resuid;
2909 sbi->s_resgid = old_opts.s_resgid;
2910 sbi->s_commit_interval = old_opts.s_commit_interval;
2911#ifdef CONFIG_QUOTA
2912 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2913 for (i = 0; i < MAXQUOTAS; i++) {
2914 if (sbi->s_qf_names[i] &&
2915 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2916 kfree(sbi->s_qf_names[i]);
2917 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2918 }
2919#endif
2920 return err;
2921}
2922
617ba13b 2923static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf)
ac27a0ec
DK		 2924{
2925 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 2926 struct ext4_sb_info *sbi = EXT4_SB(sb);
2927 struct ext4_super_block *es = sbi->s_es;
960cc398 2928 u64 fsid;
ac27a0ec 2929
5e70030d
BP		 2930 if (test_opt(sb, MINIX_DF)) {
2931 sbi->s_overhead_last = 0;
6bc9feff 2932 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
fd2d4291 2933 ext4_group_t ngroups = sbi->s_groups_count, i;
5e70030d 2934 ext4_fsblk_t overhead = 0;
ac27a0ec
DK		 2935 smp_rmb();
2936
2937 /*
5e70030d
BP		 2938 * Compute the overhead (FS structures). This is constant
2939 * for a given filesystem unless the number of block groups
2940 * changes so we cache the previous value until it does.
ac27a0ec
DK		 2941 */
2942
2943 /*
2944 * All of the blocks before first_data_block are
2945 * overhead
2946 */
2947 overhead = le32_to_cpu(es->s_first_data_block);
2948
2949 /*
2950 * Add the overhead attributed to the superblock and
2951 * block group descriptors. If the sparse superblocks
2952 * feature is turned on, then not all groups have this.
2953 */
2954 for (i = 0; i < ngroups; i++) {
617ba13b
MC		 2955 overhead += ext4_bg_has_super(sb, i) +
2956 ext4_bg_num_gdb(sb, i);
ac27a0ec
DK		 2957 cond_resched();
2958 }
2959
2960 /*
2961 * Every block group has an inode bitmap, a block
2962 * bitmap, and an inode table.
2963 */
5e70030d
BP		 2964 overhead += ngroups * (2 + sbi->s_itb_per_group);
2965 sbi->s_overhead_last = overhead;
2966 smp_wmb();
6bc9feff 2967 sbi->s_blocks_last = ext4_blocks_count(es);
ac27a0ec
DK		 2968 }
2969
617ba13b 2970 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 2971 buf->f_bsize = sb->s_blocksize;
5e70030d 2972 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
52d9f3b4 2973 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
308ba3ec 2974 ext4_free_blocks_count_set(es, buf->f_bfree);
bd81d8ee
LV		 2975 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
2976 if (buf->f_bfree < ext4_r_blocks_count(es))
ac27a0ec
DK		 2977 buf->f_bavail = 0;
2978 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 2979 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
5e70030d 2980 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
617ba13b 2981 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 2982 fsid = le64_to_cpup((void *)es->s_uuid) ^
2983 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2984 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2985 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
ac27a0ec
DK		 2986 return 0;
2987}
2988
2989/* Helper function for writing quotas on sync - we need to start transaction before quota file
2990 * is locked for write. Otherwise the are possible deadlocks:
2991 * Process 1 Process 2
617ba13b 2992 * ext4_create() quota_sync()
dab291af 2993 * jbd2_journal_start() write_dquot()
ac27a0ec 2994 * DQUOT_INIT() down(dqio_mutex)
dab291af 2995 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 2996 *
2997 */
2998
2999#ifdef CONFIG_QUOTA
3000
3001static inline struct inode *dquot_to_inode(struct dquot *dquot)
3002{
3003 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
3004}
3005
617ba13b 3006static int ext4_dquot_initialize(struct inode *inode, int type)
ac27a0ec
DK		 3007{
3008 handle_t *handle;
3009 int ret, err;
3010
3011 /* We may create quota structure so we need to reserve enough blocks */
617ba13b 3012 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb));
ac27a0ec
DK		 3013 if (IS_ERR(handle))
3014 return PTR_ERR(handle);
3015 ret = dquot_initialize(inode, type);
617ba13b 3016 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3017 if (!ret)
3018 ret = err;
3019 return ret;
3020}
3021
617ba13b 3022static int ext4_dquot_drop(struct inode *inode)
ac27a0ec
DK		 3023{
3024 handle_t *handle;
3025 int ret, err;
3026
3027 /* We may delete quota structure so we need to reserve enough blocks */
617ba13b 3028 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb));
ac27a0ec
DK		 3029 if (IS_ERR(handle))
3030 return PTR_ERR(handle);
3031 ret = dquot_drop(inode);
617ba13b 3032 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3033 if (!ret)
3034 ret = err;
3035 return ret;
3036}
3037
617ba13b 3038static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 3039{
3040 int ret, err;
3041 handle_t *handle;
3042 struct inode *inode;
3043
3044 inode = dquot_to_inode(dquot);
617ba13b
MC		 3045 handle = ext4_journal_start(inode,
3046 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 3047 if (IS_ERR(handle))
3048 return PTR_ERR(handle);
3049 ret = dquot_commit(dquot);
617ba13b 3050 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3051 if (!ret)
3052 ret = err;
3053 return ret;
3054}
3055
617ba13b 3056static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 3057{
3058 int ret, err;
3059 handle_t *handle;
3060
617ba13b
MC		 3061 handle = ext4_journal_start(dquot_to_inode(dquot),
3062 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 3063 if (IS_ERR(handle))
3064 return PTR_ERR(handle);
3065 ret = dquot_acquire(dquot);
617ba13b 3066 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3067 if (!ret)
3068 ret = err;
3069 return ret;
3070}
3071
617ba13b 3072static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 3073{
3074 int ret, err;
3075 handle_t *handle;
3076
617ba13b
MC		 3077 handle = ext4_journal_start(dquot_to_inode(dquot),
3078 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 3079 if (IS_ERR(handle)) {
3080 /* Release dquot anyway to avoid endless cycle in dqput() */
3081 dquot_release(dquot);
ac27a0ec 3082 return PTR_ERR(handle);
9c3013e9 3083 }
ac27a0ec 3084 ret = dquot_release(dquot);
617ba13b 3085 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3086 if (!ret)
3087 ret = err;
3088 return ret;
3089}
3090
617ba13b 3091static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec
DK		 3092{
3093 /* Are we journalling quotas? */
617ba13b
MC		 3094 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
3095 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
ac27a0ec 3096 dquot_mark_dquot_dirty(dquot);
617ba13b 3097 return ext4_write_dquot(dquot);
ac27a0ec
DK		 3098 } else {
3099 return dquot_mark_dquot_dirty(dquot);
3100 }
3101}
3102
617ba13b 3103static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 3104{
3105 int ret, err;
3106 handle_t *handle;
3107
3108 /* Data block + inode block */
617ba13b 3109 handle = ext4_journal_start(sb->s_root->d_inode, 2);
ac27a0ec
DK		 3110 if (IS_ERR(handle))
3111 return PTR_ERR(handle);
3112 ret = dquot_commit_info(sb, type);
617ba13b 3113 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3114 if (!ret)
3115 ret = err;
3116 return ret;
3117}
3118
3119/*
3120 * Turn on quotas during mount time - we need to find
3121 * the quota file and such...
3122 */
617ba13b 3123static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 3124{
617ba13b
MC		 3125 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
3126 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 3127}
3128
3129/*
3130 * Standard function to be called on quota_on
3131 */
617ba13b 3132static int ext4_quota_on(struct super_block *sb, int type, int format_id,
ac27a0ec
DK		 3133 char *path)
3134{
3135 int err;
3136 struct nameidata nd;
3137
3138 if (!test_opt(sb, QUOTA))
3139 return -EINVAL;
3140 /* Not journalling quota? */
617ba13b
MC		 3141 if (!EXT4_SB(sb)->s_qf_names[USRQUOTA] &&
3142 !EXT4_SB(sb)->s_qf_names[GRPQUOTA])
ac27a0ec
DK		 3143 return vfs_quota_on(sb, type, format_id, path);
3144 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
3145 if (err)
3146 return err;
3147 /* Quotafile not on the same filesystem? */
3148 if (nd.mnt->mnt_sb != sb) {
3149 path_release(&nd);
3150 return -EXDEV;
3151 }
3152 /* Quotafile not of fs root? */
3153 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
3154 printk(KERN_WARNING
617ba13b 3155 "EXT4-fs: Quota file not on filesystem root. "
ac27a0ec
DK		 3156 "Journalled quota will not work.\n");
3157 path_release(&nd);
3158 return vfs_quota_on(sb, type, format_id, path);
3159}
3160
3161/* Read data from quotafile - avoid pagecache and such because we cannot afford
3162 * acquiring the locks... As quota files are never truncated and quota code
3163 * itself serializes the operations (and noone else should touch the files)
3164 * we don't have to be afraid of races */
617ba13b 3165static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 3166 size_t len, loff_t off)
3167{
3168 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 3169 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 3170 int err = 0;
3171 int offset = off & (sb->s_blocksize - 1);
3172 int tocopy;
3173 size_t toread;
3174 struct buffer_head *bh;
3175 loff_t i_size = i_size_read(inode);
3176
3177 if (off > i_size)
3178 return 0;
3179 if (off+len > i_size)
3180 len = i_size-off;
3181 toread = len;
3182 while (toread > 0) {
3183 tocopy = sb->s_blocksize - offset < toread ?
3184 sb->s_blocksize - offset : toread;
617ba13b 3185 bh = ext4_bread(NULL, inode, blk, 0, &err);
ac27a0ec
DK		 3186 if (err)
3187 return err;
3188 if (!bh) /* A hole? */
3189 memset(data, 0, tocopy);
3190 else
3191 memcpy(data, bh->b_data+offset, tocopy);
3192 brelse(bh);
3193 offset = 0;
3194 toread -= tocopy;
3195 data += tocopy;
3196 blk++;
3197 }
3198 return len;
3199}
3200
3201/* Write to quotafile (we know the transaction is already started and has
3202 * enough credits) */
617ba13b 3203static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 3204 const char *data, size_t len, loff_t off)
3205{
3206 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 3207 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 3208 int err = 0;
3209 int offset = off & (sb->s_blocksize - 1);
3210 int tocopy;
617ba13b 3211 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
ac27a0ec
DK		 3212 size_t towrite = len;
3213 struct buffer_head *bh;
3214 handle_t *handle = journal_current_handle();
3215
9c3013e9
JK		 3216 if (!handle) {
3217 printk(KERN_WARNING "EXT4-fs: Quota write (off=%Lu, len=%Lu)"
3218 " cancelled because transaction is not started.\n",
3219 (unsigned long long)off, (unsigned long long)len);
3220 return -EIO;
3221 }
ac27a0ec
DK		 3222 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
3223 while (towrite > 0) {
3224 tocopy = sb->s_blocksize - offset < towrite ?
3225 sb->s_blocksize - offset : towrite;
617ba13b 3226 bh = ext4_bread(handle, inode, blk, 1, &err);
ac27a0ec
DK		 3227 if (!bh)
3228 goto out;
3229 if (journal_quota) {
617ba13b 3230 err = ext4_journal_get_write_access(handle, bh);
ac27a0ec
DK		 3231 if (err) {
3232 brelse(bh);
3233 goto out;
3234 }
3235 }
3236 lock_buffer(bh);
3237 memcpy(bh->b_data+offset, data, tocopy);
3238 flush_dcache_page(bh->b_page);
3239 unlock_buffer(bh);
3240 if (journal_quota)
617ba13b 3241 err = ext4_journal_dirty_metadata(handle, bh);
ac27a0ec
DK		 3242 else {
3243 /* Always do at least ordered writes for quotas */
617ba13b 3244 err = ext4_journal_dirty_data(handle, bh);
ac27a0ec
DK		 3245 mark_buffer_dirty(bh);
3246 }
3247 brelse(bh);
3248 if (err)
3249 goto out;
3250 offset = 0;
3251 towrite -= tocopy;
3252 data += tocopy;
3253 blk++;
3254 }
3255out:
3256 if (len == towrite)
3257 return err;
3258 if (inode->i_size < off+len-towrite) {
3259 i_size_write(inode, off+len-towrite);
617ba13b 3260 EXT4_I(inode)->i_disksize = inode->i_size;
ac27a0ec 3261 }
ac27a0ec 3262 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
617ba13b 3263 ext4_mark_inode_dirty(handle, inode);
ac27a0ec
DK		 3264 mutex_unlock(&inode->i_mutex);
3265 return len - towrite;
3266}
3267
3268#endif
3269
617ba13b 3270static int ext4_get_sb(struct file_system_type *fs_type,
ac27a0ec
DK		 3271 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3272{
617ba13b 3273 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
ac27a0ec
DK		 3274}
3275
617ba13b 3276static struct file_system_type ext4dev_fs_type = {
ac27a0ec 3277 .owner = THIS_MODULE,
617ba13b
MC		 3278 .name = "ext4dev",
3279 .get_sb = ext4_get_sb,
ac27a0ec
DK		 3280 .kill_sb = kill_block_super,
3281 .fs_flags = FS_REQUIRES_DEV,
3282};
3283
617ba13b 3284static int __init init_ext4_fs(void)
ac27a0ec 3285{
c9de560d
AT		 3286 int err;
3287
3288 err = init_ext4_mballoc();
ac27a0ec
DK		 3289 if (err)
3290 return err;
c9de560d
AT		 3291
3292 err = init_ext4_xattr();
3293 if (err)
3294 goto out2;
ac27a0ec
DK		 3295 err = init_inodecache();
3296 if (err)
3297 goto out1;
63f57933 3298 err = register_filesystem(&ext4dev_fs_type);
ac27a0ec
DK		 3299 if (err)
3300 goto out;
3301 return 0;
3302out:
3303 destroy_inodecache();
3304out1:
617ba13b 3305 exit_ext4_xattr();
c9de560d
AT		 3306out2:
3307 exit_ext4_mballoc();
ac27a0ec
DK		 3308 return err;
3309}
3310
617ba13b 3311static void __exit exit_ext4_fs(void)
ac27a0ec 3312{
617ba13b 3313 unregister_filesystem(&ext4dev_fs_type);
ac27a0ec 3314 destroy_inodecache();
617ba13b 3315 exit_ext4_xattr();
c9de560d 3316 exit_ext4_mballoc();
ac27a0ec
DK		 3317}
3318
3319MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
617ba13b 3320MODULE_DESCRIPTION("Fourth Extended Filesystem with extents");
ac27a0ec 3321MODULE_LICENSE("GPL");
617ba13b
MC		 3322module_init(init_ext4_fs)
3323module_exit(exit_ext4_fs)
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