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ext4: Enable the multiblock allocator by default
[net-next-2.6.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");
3dbd0ede
AK		 739 if (!test_opt(sb, MBALLOC))
740 seq_puts(seq, ",nomballoc");
25ec56b5
JNC		 741 if (test_opt(sb, I_VERSION))
742 seq_puts(seq, ",i_version");
ac27a0ec 743
aa22df2c
AK		 744 /*
745 * journal mode get enabled in different ways
746 * So just print the value even if we didn't specify it
747 */
617ba13b 748 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
ac27a0ec 749 seq_puts(seq, ",data=journal");
617ba13b 750 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
ac27a0ec 751 seq_puts(seq, ",data=ordered");
617ba13b 752 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
ac27a0ec
DK		 753 seq_puts(seq, ",data=writeback");
754
617ba13b 755 ext4_show_quota_options(seq, sb);
ac27a0ec
DK		 756 return 0;
757}
758
759
1b961ac0
CH		 760static struct inode *ext4_nfs_get_inode(struct super_block *sb,
761 u64 ino, u32 generation)
ac27a0ec 762{
ac27a0ec 763 struct inode *inode;
ac27a0ec 764
617ba13b 765 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 766 return ERR_PTR(-ESTALE);
617ba13b 767 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 768 return ERR_PTR(-ESTALE);
769
770 /* iget isn't really right if the inode is currently unallocated!!
771 *
617ba13b 772 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 773 * deleted, so we should be safe.
774 *
775 * Currently we don't know the generation for parent directory, so
776 * a generation of 0 means "accept any"
777 */
778 inode = iget(sb, ino);
779 if (inode == NULL)
780 return ERR_PTR(-ENOMEM);
781 if (is_bad_inode(inode) ||
782 (generation && inode->i_generation != generation)) {
783 iput(inode);
784 return ERR_PTR(-ESTALE);
785 }
1b961ac0
CH		 786
787 return inode;
788}
789
790static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
791 int fh_len, int fh_type)
792{
793 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
794 ext4_nfs_get_inode);
795}
796
797static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
798 int fh_len, int fh_type)
799{
800 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
801 ext4_nfs_get_inode);
ac27a0ec
DK		 802}
803
804#ifdef CONFIG_QUOTA
805#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
806#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
807
617ba13b
MC		 808static int ext4_dquot_initialize(struct inode *inode, int type);
809static int ext4_dquot_drop(struct inode *inode);
810static int ext4_write_dquot(struct dquot *dquot);
811static int ext4_acquire_dquot(struct dquot *dquot);
812static int ext4_release_dquot(struct dquot *dquot);
813static int ext4_mark_dquot_dirty(struct dquot *dquot);
814static int ext4_write_info(struct super_block *sb, int type);
815static int ext4_quota_on(struct super_block *sb, int type, int format_id, char *path);
816static int ext4_quota_on_mount(struct super_block *sb, int type);
817static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 818 size_t len, loff_t off);
617ba13b 819static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 820 const char *data, size_t len, loff_t off);
821
617ba13b
MC		 822static struct dquot_operations ext4_quota_operations = {
823 .initialize = ext4_dquot_initialize,
824 .drop = ext4_dquot_drop,
ac27a0ec
DK		 825 .alloc_space = dquot_alloc_space,
826 .alloc_inode = dquot_alloc_inode,
827 .free_space = dquot_free_space,
828 .free_inode = dquot_free_inode,
829 .transfer = dquot_transfer,
617ba13b
MC		 830 .write_dquot = ext4_write_dquot,
831 .acquire_dquot = ext4_acquire_dquot,
832 .release_dquot = ext4_release_dquot,
833 .mark_dirty = ext4_mark_dquot_dirty,
834 .write_info = ext4_write_info
ac27a0ec
DK		 835};
836
617ba13b
MC		 837static struct quotactl_ops ext4_qctl_operations = {
838 .quota_on = ext4_quota_on,
ac27a0ec
DK		 839 .quota_off = vfs_quota_off,
840 .quota_sync = vfs_quota_sync,
841 .get_info = vfs_get_dqinfo,
842 .set_info = vfs_set_dqinfo,
843 .get_dqblk = vfs_get_dqblk,
844 .set_dqblk = vfs_set_dqblk
845};
846#endif
847
ee9b6d61 848static const struct super_operations ext4_sops = {
617ba13b
MC		 849 .alloc_inode = ext4_alloc_inode,
850 .destroy_inode = ext4_destroy_inode,
851 .read_inode = ext4_read_inode,
852 .write_inode = ext4_write_inode,
853 .dirty_inode = ext4_dirty_inode,
854 .delete_inode = ext4_delete_inode,
855 .put_super = ext4_put_super,
856 .write_super = ext4_write_super,
857 .sync_fs = ext4_sync_fs,
858 .write_super_lockfs = ext4_write_super_lockfs,
859 .unlockfs = ext4_unlockfs,
860 .statfs = ext4_statfs,
861 .remount_fs = ext4_remount,
862 .clear_inode = ext4_clear_inode,
863 .show_options = ext4_show_options,
ac27a0ec 864#ifdef CONFIG_QUOTA
617ba13b
MC		 865 .quota_read = ext4_quota_read,
866 .quota_write = ext4_quota_write,
ac27a0ec
DK		 867#endif
868};
869
39655164 870static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 871 .fh_to_dentry = ext4_fh_to_dentry,
872 .fh_to_parent = ext4_fh_to_parent,
617ba13b 873 .get_parent = ext4_get_parent,
ac27a0ec
DK		 874};
875
876enum {
877 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
878 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
879 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
880 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
881 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
882 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
818d276c 883 Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec
DK		 884 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
885 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
886 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
887 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
25ec56b5 888 Opt_grpquota, Opt_extents, Opt_noextents, Opt_i_version,
c9de560d 889 Opt_mballoc, Opt_nomballoc, Opt_stripe,
ac27a0ec
DK		 890};
891
892static match_table_t tokens = {
893 {Opt_bsd_df, "bsddf"},
894 {Opt_minix_df, "minixdf"},
895 {Opt_grpid, "grpid"},
896 {Opt_grpid, "bsdgroups"},
897 {Opt_nogrpid, "nogrpid"},
898 {Opt_nogrpid, "sysvgroups"},
899 {Opt_resgid, "resgid=%u"},
900 {Opt_resuid, "resuid=%u"},
901 {Opt_sb, "sb=%u"},
902 {Opt_err_cont, "errors=continue"},
903 {Opt_err_panic, "errors=panic"},
904 {Opt_err_ro, "errors=remount-ro"},
905 {Opt_nouid32, "nouid32"},
906 {Opt_nocheck, "nocheck"},
907 {Opt_nocheck, "check=none"},
908 {Opt_debug, "debug"},
909 {Opt_oldalloc, "oldalloc"},
910 {Opt_orlov, "orlov"},
911 {Opt_user_xattr, "user_xattr"},
912 {Opt_nouser_xattr, "nouser_xattr"},
913 {Opt_acl, "acl"},
914 {Opt_noacl, "noacl"},
915 {Opt_reservation, "reservation"},
916 {Opt_noreservation, "noreservation"},
917 {Opt_noload, "noload"},
918 {Opt_nobh, "nobh"},
919 {Opt_bh, "bh"},
920 {Opt_commit, "commit=%u"},
921 {Opt_journal_update, "journal=update"},
922 {Opt_journal_inum, "journal=%u"},
923 {Opt_journal_dev, "journal_dev=%u"},
818d276c
GS		 924 {Opt_journal_checksum, "journal_checksum"},
925 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 926 {Opt_abort, "abort"},
927 {Opt_data_journal, "data=journal"},
928 {Opt_data_ordered, "data=ordered"},
929 {Opt_data_writeback, "data=writeback"},
930 {Opt_offusrjquota, "usrjquota="},
931 {Opt_usrjquota, "usrjquota=%s"},
932 {Opt_offgrpjquota, "grpjquota="},
933 {Opt_grpjquota, "grpjquota=%s"},
934 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
935 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
936 {Opt_grpquota, "grpquota"},
937 {Opt_noquota, "noquota"},
938 {Opt_quota, "quota"},
939 {Opt_usrquota, "usrquota"},
940 {Opt_barrier, "barrier=%u"},
a86c6181 941 {Opt_extents, "extents"},
1e2462f9 942 {Opt_noextents, "noextents"},
25ec56b5 943 {Opt_i_version, "i_version"},
c9de560d
AT		 944 {Opt_mballoc, "mballoc"},
945 {Opt_nomballoc, "nomballoc"},
946 {Opt_stripe, "stripe=%u"},
ac27a0ec
DK		 947 {Opt_err, NULL},
948 {Opt_resize, "resize"},
949};
950
617ba13b 951static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 952{
617ba13b 953 ext4_fsblk_t sb_block;
ac27a0ec
DK		 954 char *options = (char *) *data;
955
956 if (!options || strncmp(options, "sb=", 3) != 0)
957 return 1; /* Default location */
958 options += 3;
617ba13b 959 /*todo: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 960 sb_block = simple_strtoul(options, &options, 0);
961 if (*options && *options != ',') {
617ba13b 962 printk("EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 963 (char *) *data);
964 return 1;
965 }
966 if (*options == ',')
967 options++;
968 *data = (void *) options;
969 return sb_block;
970}
971
972static int parse_options (char *options, struct super_block *sb,
973 unsigned int *inum, unsigned long *journal_devnum,
617ba13b 974 ext4_fsblk_t *n_blocks_count, int is_remount)
ac27a0ec 975{
617ba13b 976 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 977 char * p;
978 substring_t args[MAX_OPT_ARGS];
979 int data_opt = 0;
980 int option;
981#ifdef CONFIG_QUOTA
982 int qtype;
983 char *qname;
984#endif
985
986 if (!options)
987 return 1;
988
989 while ((p = strsep (&options, ",")) != NULL) {
990 int token;
991 if (!*p)
992 continue;
993
994 token = match_token(p, tokens, args);
995 switch (token) {
996 case Opt_bsd_df:
997 clear_opt (sbi->s_mount_opt, MINIX_DF);
998 break;
999 case Opt_minix_df:
1000 set_opt (sbi->s_mount_opt, MINIX_DF);
1001 break;
1002 case Opt_grpid:
1003 set_opt (sbi->s_mount_opt, GRPID);
1004 break;
1005 case Opt_nogrpid:
1006 clear_opt (sbi->s_mount_opt, GRPID);
1007 break;
1008 case Opt_resuid:
1009 if (match_int(&args[0], &option))
1010 return 0;
1011 sbi->s_resuid = option;
1012 break;
1013 case Opt_resgid:
1014 if (match_int(&args[0], &option))
1015 return 0;
1016 sbi->s_resgid = option;
1017 break;
1018 case Opt_sb:
1019 /* handled by get_sb_block() instead of here */
1020 /* *sb_block = match_int(&args[0]); */
1021 break;
1022 case Opt_err_panic:
1023 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1024 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1025 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
1026 break;
1027 case Opt_err_ro:
1028 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1029 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1030 set_opt (sbi->s_mount_opt, ERRORS_RO);
1031 break;
1032 case Opt_err_cont:
1033 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1034 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1035 set_opt (sbi->s_mount_opt, ERRORS_CONT);
1036 break;
1037 case Opt_nouid32:
1038 set_opt (sbi->s_mount_opt, NO_UID32);
1039 break;
1040 case Opt_nocheck:
1041 clear_opt (sbi->s_mount_opt, CHECK);
1042 break;
1043 case Opt_debug:
1044 set_opt (sbi->s_mount_opt, DEBUG);
1045 break;
1046 case Opt_oldalloc:
1047 set_opt (sbi->s_mount_opt, OLDALLOC);
1048 break;
1049 case Opt_orlov:
1050 clear_opt (sbi->s_mount_opt, OLDALLOC);
1051 break;
617ba13b 1052#ifdef CONFIG_EXT4DEV_FS_XATTR
ac27a0ec
DK		 1053 case Opt_user_xattr:
1054 set_opt (sbi->s_mount_opt, XATTR_USER);
1055 break;
1056 case Opt_nouser_xattr:
1057 clear_opt (sbi->s_mount_opt, XATTR_USER);
1058 break;
1059#else
1060 case Opt_user_xattr:
1061 case Opt_nouser_xattr:
617ba13b 1062 printk("EXT4 (no)user_xattr options not supported\n");
ac27a0ec
DK		 1063 break;
1064#endif
617ba13b 1065#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
ac27a0ec
DK		 1066 case Opt_acl:
1067 set_opt(sbi->s_mount_opt, POSIX_ACL);
1068 break;
1069 case Opt_noacl:
1070 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1071 break;
1072#else
1073 case Opt_acl:
1074 case Opt_noacl:
617ba13b 1075 printk("EXT4 (no)acl options not supported\n");
ac27a0ec
DK		 1076 break;
1077#endif
1078 case Opt_reservation:
1079 set_opt(sbi->s_mount_opt, RESERVATION);
1080 break;
1081 case Opt_noreservation:
1082 clear_opt(sbi->s_mount_opt, RESERVATION);
1083 break;
1084 case Opt_journal_update:
1085 /* @@@ FIXME */
1086 /* Eventually we will want to be able to create
1087 a journal file here. For now, only allow the
1088 user to specify an existing inode to be the
1089 journal file. */
1090 if (is_remount) {
617ba13b 1091 printk(KERN_ERR "EXT4-fs: cannot specify "
ac27a0ec
DK		 1092 "journal on remount\n");
1093 return 0;
1094 }
1095 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1096 break;
1097 case Opt_journal_inum:
1098 if (is_remount) {
617ba13b 1099 printk(KERN_ERR "EXT4-fs: cannot specify "
ac27a0ec
DK		 1100 "journal on remount\n");
1101 return 0;
1102 }
1103 if (match_int(&args[0], &option))
1104 return 0;
1105 *inum = option;
1106 break;
1107 case Opt_journal_dev:
1108 if (is_remount) {
617ba13b 1109 printk(KERN_ERR "EXT4-fs: cannot specify "
ac27a0ec
DK		 1110 "journal on remount\n");
1111 return 0;
1112 }
1113 if (match_int(&args[0], &option))
1114 return 0;
1115 *journal_devnum = option;
1116 break;
818d276c
GS		 1117 case Opt_journal_checksum:
1118 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1119 break;
1120 case Opt_journal_async_commit:
1121 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
1122 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1123 break;
ac27a0ec
DK		 1124 case Opt_noload:
1125 set_opt (sbi->s_mount_opt, NOLOAD);
1126 break;
1127 case Opt_commit:
1128 if (match_int(&args[0], &option))
1129 return 0;
1130 if (option < 0)
1131 return 0;
1132 if (option == 0)
cd02ff0b 1133 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
ac27a0ec
DK		 1134 sbi->s_commit_interval = HZ * option;
1135 break;
1136 case Opt_data_journal:
617ba13b 1137 data_opt = EXT4_MOUNT_JOURNAL_DATA;
ac27a0ec
DK		 1138 goto datacheck;
1139 case Opt_data_ordered:
617ba13b 1140 data_opt = EXT4_MOUNT_ORDERED_DATA;
ac27a0ec
DK		 1141 goto datacheck;
1142 case Opt_data_writeback:
617ba13b 1143 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
ac27a0ec
DK		 1144 datacheck:
1145 if (is_remount) {
617ba13b 1146 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
ac27a0ec
DK		 1147 != data_opt) {
1148 printk(KERN_ERR
617ba13b 1149 "EXT4-fs: cannot change data "
ac27a0ec
DK		 1150 "mode on remount\n");
1151 return 0;
1152 }
1153 } else {
617ba13b 1154 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
ac27a0ec
DK		 1155 sbi->s_mount_opt |= data_opt;
1156 }
1157 break;
1158#ifdef CONFIG_QUOTA
1159 case Opt_usrjquota:
1160 qtype = USRQUOTA;
1161 goto set_qf_name;
1162 case Opt_grpjquota:
1163 qtype = GRPQUOTA;
1164set_qf_name:
1165 if (sb_any_quota_enabled(sb)) {
1166 printk(KERN_ERR
617ba13b 1167 "EXT4-fs: Cannot change journalled "
ac27a0ec
DK		 1168 "quota options when quota turned on.\n");
1169 return 0;
1170 }
1171 qname = match_strdup(&args[0]);
1172 if (!qname) {
1173 printk(KERN_ERR
617ba13b 1174 "EXT4-fs: not enough memory for "
ac27a0ec
DK		 1175 "storing quotafile name.\n");
1176 return 0;
1177 }
1178 if (sbi->s_qf_names[qtype] &&
1179 strcmp(sbi->s_qf_names[qtype], qname)) {
1180 printk(KERN_ERR
617ba13b 1181 "EXT4-fs: %s quota file already "
ac27a0ec
DK		 1182 "specified.\n", QTYPE2NAME(qtype));
1183 kfree(qname);
1184 return 0;
1185 }
1186 sbi->s_qf_names[qtype] = qname;
1187 if (strchr(sbi->s_qf_names[qtype], '/')) {
1188 printk(KERN_ERR
617ba13b 1189 "EXT4-fs: quotafile must be on "
ac27a0ec
DK		 1190 "filesystem root.\n");
1191 kfree(sbi->s_qf_names[qtype]);
1192 sbi->s_qf_names[qtype] = NULL;
1193 return 0;
1194 }
1195 set_opt(sbi->s_mount_opt, QUOTA);
1196 break;
1197 case Opt_offusrjquota:
1198 qtype = USRQUOTA;
1199 goto clear_qf_name;
1200 case Opt_offgrpjquota:
1201 qtype = GRPQUOTA;
1202clear_qf_name:
1203 if (sb_any_quota_enabled(sb)) {
617ba13b 1204 printk(KERN_ERR "EXT4-fs: Cannot change "
ac27a0ec
DK		 1205 "journalled quota options when "
1206 "quota turned on.\n");
1207 return 0;
1208 }
1209 /*
1210 * The space will be released later when all options
1211 * are confirmed to be correct
1212 */
1213 sbi->s_qf_names[qtype] = NULL;
1214 break;
1215 case Opt_jqfmt_vfsold:
1216 sbi->s_jquota_fmt = QFMT_VFS_OLD;
1217 break;
1218 case Opt_jqfmt_vfsv0:
1219 sbi->s_jquota_fmt = QFMT_VFS_V0;
1220 break;
1221 case Opt_quota:
1222 case Opt_usrquota:
1223 set_opt(sbi->s_mount_opt, QUOTA);
1224 set_opt(sbi->s_mount_opt, USRQUOTA);
1225 break;
1226 case Opt_grpquota:
1227 set_opt(sbi->s_mount_opt, QUOTA);
1228 set_opt(sbi->s_mount_opt, GRPQUOTA);
1229 break;
1230 case Opt_noquota:
1231 if (sb_any_quota_enabled(sb)) {
617ba13b 1232 printk(KERN_ERR "EXT4-fs: Cannot change quota "
ac27a0ec
DK		 1233 "options when quota turned on.\n");
1234 return 0;
1235 }
1236 clear_opt(sbi->s_mount_opt, QUOTA);
1237 clear_opt(sbi->s_mount_opt, USRQUOTA);
1238 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1239 break;
1240#else
1241 case Opt_quota:
1242 case Opt_usrquota:
1243 case Opt_grpquota:
1244 case Opt_usrjquota:
1245 case Opt_grpjquota:
1246 case Opt_offusrjquota:
1247 case Opt_offgrpjquota:
1248 case Opt_jqfmt_vfsold:
1249 case Opt_jqfmt_vfsv0:
1250 printk(KERN_ERR
617ba13b 1251 "EXT4-fs: journalled quota options not "
ac27a0ec
DK		 1252 "supported.\n");
1253 break;
1254 case Opt_noquota:
1255 break;
1256#endif
1257 case Opt_abort:
1258 set_opt(sbi->s_mount_opt, ABORT);
1259 break;
1260 case Opt_barrier:
1261 if (match_int(&args[0], &option))
1262 return 0;
1263 if (option)
1264 set_opt(sbi->s_mount_opt, BARRIER);
1265 else
1266 clear_opt(sbi->s_mount_opt, BARRIER);
1267 break;
1268 case Opt_ignore:
1269 break;
1270 case Opt_resize:
1271 if (!is_remount) {
617ba13b 1272 printk("EXT4-fs: resize option only available "
ac27a0ec
DK		 1273 "for remount\n");
1274 return 0;
1275 }
1276 if (match_int(&args[0], &option) != 0)
1277 return 0;
1278 *n_blocks_count = option;
1279 break;
1280 case Opt_nobh:
1281 set_opt(sbi->s_mount_opt, NOBH);
1282 break;
1283 case Opt_bh:
1284 clear_opt(sbi->s_mount_opt, NOBH);
1285 break;
a86c6181
AT		 1286 case Opt_extents:
1287 set_opt (sbi->s_mount_opt, EXTENTS);
1288 break;
1e2462f9
MC		 1289 case Opt_noextents:
1290 clear_opt (sbi->s_mount_opt, EXTENTS);
1291 break;
25ec56b5
JNC		 1292 case Opt_i_version:
1293 set_opt(sbi->s_mount_opt, I_VERSION);
1294 sb->s_flags |= MS_I_VERSION;
1295 break;
c9de560d
AT		 1296 case Opt_mballoc:
1297 set_opt(sbi->s_mount_opt, MBALLOC);
1298 break;
1299 case Opt_nomballoc:
1300 clear_opt(sbi->s_mount_opt, MBALLOC);
1301 break;
1302 case Opt_stripe:
1303 if (match_int(&args[0], &option))
1304 return 0;
1305 if (option < 0)
1306 return 0;
1307 sbi->s_stripe = option;
1308 break;
ac27a0ec
DK		 1309 default:
1310 printk (KERN_ERR
617ba13b 1311 "EXT4-fs: Unrecognized mount option \"%s\" "
ac27a0ec
DK		 1312 "or missing value\n", p);
1313 return 0;
1314 }
1315 }
1316#ifdef CONFIG_QUOTA
1317 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
617ba13b 1318 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
ac27a0ec
DK		 1319 sbi->s_qf_names[USRQUOTA])
1320 clear_opt(sbi->s_mount_opt, USRQUOTA);
1321
617ba13b 1322 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
ac27a0ec
DK		 1323 sbi->s_qf_names[GRPQUOTA])
1324 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1325
1326 if ((sbi->s_qf_names[USRQUOTA] &&
617ba13b 1327 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
ac27a0ec 1328 (sbi->s_qf_names[GRPQUOTA] &&
617ba13b
MC		 1329 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
1330 printk(KERN_ERR "EXT4-fs: old and new quota "
ac27a0ec
DK		 1331 "format mixing.\n");
1332 return 0;
1333 }
1334
1335 if (!sbi->s_jquota_fmt) {
617ba13b 1336 printk(KERN_ERR "EXT4-fs: journalled quota format "
ac27a0ec
DK		 1337 "not specified.\n");
1338 return 0;
1339 }
1340 } else {
1341 if (sbi->s_jquota_fmt) {
617ba13b 1342 printk(KERN_ERR "EXT4-fs: journalled quota format "
ac27a0ec
DK		 1343 "specified with no journalling "
1344 "enabled.\n");
1345 return 0;
1346 }
1347 }
1348#endif
1349 return 1;
1350}
1351
617ba13b 1352static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1353 int read_only)
1354{
617ba13b 1355 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1356 int res = 0;
1357
617ba13b
MC		 1358 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1359 printk (KERN_ERR "EXT4-fs warning: revision level too high, "
ac27a0ec
DK		 1360 "forcing read-only mode\n");
1361 res = MS_RDONLY;
1362 }
1363 if (read_only)
1364 return res;
617ba13b
MC		 1365 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1366 printk (KERN_WARNING "EXT4-fs warning: mounting unchecked fs, "
ac27a0ec 1367 "running e2fsck is recommended\n");
617ba13b 1368 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
ac27a0ec 1369 printk (KERN_WARNING
617ba13b 1370 "EXT4-fs warning: mounting fs with errors, "
ac27a0ec
DK		 1371 "running e2fsck is recommended\n");
1372 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1373 le16_to_cpu(es->s_mnt_count) >=
1374 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1375 printk (KERN_WARNING
617ba13b 1376 "EXT4-fs warning: maximal mount count reached, "
ac27a0ec
DK		 1377 "running e2fsck is recommended\n");
1378 else if (le32_to_cpu(es->s_checkinterval) &&
1379 (le32_to_cpu(es->s_lastcheck) +
1380 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1381 printk (KERN_WARNING
617ba13b 1382 "EXT4-fs warning: checktime reached, "
ac27a0ec
DK		 1383 "running e2fsck is recommended\n");
1384#if 0
1385 /* @@@ We _will_ want to clear the valid bit if we find
63f57933
AM		 1386 * inconsistencies, to force a fsck at reboot. But for
1387 * a plain journaled filesystem we can keep it set as
1388 * valid forever! :)
1389 */
617ba13b 1390 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT4_VALID_FS);
ac27a0ec
DK		 1391#endif
1392 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1393 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
ac27a0ec
DK		 1394 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
1395 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b
MC		 1396 ext4_update_dynamic_rev(sb);
1397 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1398
617ba13b 1399 ext4_commit_super(sb, es, 1);
ac27a0ec 1400 if (test_opt(sb, DEBUG))
617ba13b 1401 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, "
ac27a0ec
DK		 1402 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1403 sb->s_blocksize,
1404 sbi->s_groups_count,
617ba13b
MC		 1405 EXT4_BLOCKS_PER_GROUP(sb),
1406 EXT4_INODES_PER_GROUP(sb),
ac27a0ec
DK		 1407 sbi->s_mount_opt);
1408
617ba13b
MC		 1409 printk(KERN_INFO "EXT4 FS on %s, ", sb->s_id);
1410 if (EXT4_SB(sb)->s_journal->j_inode == NULL) {
ac27a0ec
DK		 1411 char b[BDEVNAME_SIZE];
1412
1413 printk("external journal on %s\n",
617ba13b 1414 bdevname(EXT4_SB(sb)->s_journal->j_dev, b));
ac27a0ec
DK		 1415 } else {
1416 printk("internal journal\n");
1417 }
1418 return res;
1419}
1420
717d50e4
AD		 1421__le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1422 struct ext4_group_desc *gdp)
1423{
1424 __u16 crc = 0;
1425
1426 if (sbi->s_es->s_feature_ro_compat &
1427 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1428 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1429 __le32 le_group = cpu_to_le32(block_group);
1430
1431 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1432 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1433 crc = crc16(crc, (__u8 *)gdp, offset);
1434 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1435 /* for checksum of struct ext4_group_desc do the rest...*/
1436 if ((sbi->s_es->s_feature_incompat &
1437 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1438 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1439 crc = crc16(crc, (__u8 *)gdp + offset,
1440 le16_to_cpu(sbi->s_es->s_desc_size) -
1441 offset);
1442 }
1443
1444 return cpu_to_le16(crc);
1445}
1446
1447int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1448 struct ext4_group_desc *gdp)
1449{
1450 if ((sbi->s_es->s_feature_ro_compat &
1451 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1452 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1453 return 0;
1454
1455 return 1;
1456}
1457
ac27a0ec 1458/* Called at mount-time, super-block is locked */
617ba13b 1459static int ext4_check_descriptors (struct super_block * sb)
ac27a0ec 1460{
617ba13b
MC		 1461 struct ext4_sb_info *sbi = EXT4_SB(sb);
1462 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1463 ext4_fsblk_t last_block;
bd81d8ee
LV		 1464 ext4_fsblk_t block_bitmap;
1465 ext4_fsblk_t inode_bitmap;
1466 ext4_fsblk_t inode_table;
617ba13b 1467 struct ext4_group_desc * gdp = NULL;
ac27a0ec 1468 int desc_block = 0;
ce421581 1469 int flexbg_flag = 0;
fd2d4291 1470 ext4_group_t i;
ac27a0ec 1471
ce421581
JS		 1472 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1473 flexbg_flag = 1;
1474
617ba13b 1475 ext4_debug ("Checking group descriptors");
ac27a0ec
DK		 1476
1477 for (i = 0; i < sbi->s_groups_count; i++)
1478 {
ce421581 1479 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 1480 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 1481 else
1482 last_block = first_block +
617ba13b 1483 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 1484
617ba13b
MC		 1485 if ((i % EXT4_DESC_PER_BLOCK(sb)) == 0)
1486 gdp = (struct ext4_group_desc *)
ac27a0ec 1487 sbi->s_group_desc[desc_block++]->b_data;
8fadc143 1488 block_bitmap = ext4_block_bitmap(sb, gdp);
bd81d8ee 1489 if (block_bitmap < first_block || block_bitmap > last_block)
ac27a0ec 1490 {
617ba13b 1491 ext4_error (sb, "ext4_check_descriptors",
fd2d4291 1492 "Block bitmap for group %lu"
2ae02107 1493 " not in group (block %llu)!",
bd81d8ee 1494 i, block_bitmap);
ac27a0ec
DK		 1495 return 0;
1496 }
8fadc143 1497 inode_bitmap = ext4_inode_bitmap(sb, gdp);
bd81d8ee 1498 if (inode_bitmap < first_block || inode_bitmap > last_block)
ac27a0ec 1499 {
617ba13b 1500 ext4_error (sb, "ext4_check_descriptors",
fd2d4291 1501 "Inode bitmap for group %lu"
2ae02107 1502 " not in group (block %llu)!",
bd81d8ee 1503 i, inode_bitmap);
ac27a0ec
DK		 1504 return 0;
1505 }
8fadc143 1506 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 1507 if (inode_table < first_block ||
780dcdb2 1508 inode_table + sbi->s_itb_per_group - 1 > last_block)
ac27a0ec 1509 {
617ba13b 1510 ext4_error (sb, "ext4_check_descriptors",
fd2d4291 1511 "Inode table for group %lu"
2ae02107 1512 " not in group (block %llu)!",
bd81d8ee 1513 i, inode_table);
ac27a0ec
DK		 1514 return 0;
1515 }
717d50e4
AD		 1516 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
1517 ext4_error(sb, __FUNCTION__,
fd2d4291
AM		 1518 "Checksum for group %lu failed (%u!=%u)\n",
1519 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
1520 gdp)), le16_to_cpu(gdp->bg_checksum));
717d50e4
AD		 1521 return 0;
1522 }
ce421581
JS		 1523 if (!flexbg_flag)
1524 first_block += EXT4_BLOCKS_PER_GROUP(sb);
0d1ee42f
AR		 1525 gdp = (struct ext4_group_desc *)
1526 ((__u8 *)gdp + EXT4_DESC_SIZE(sb));
ac27a0ec
DK		 1527 }
1528
bd81d8ee 1529 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
617ba13b 1530 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 1531 return 1;
1532}
1533
617ba13b 1534/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 1535 * the superblock) which were deleted from all directories, but held open by
1536 * a process at the time of a crash. We walk the list and try to delete these
1537 * inodes at recovery time (only with a read-write filesystem).
1538 *
1539 * In order to keep the orphan inode chain consistent during traversal (in
1540 * case of crash during recovery), we link each inode into the superblock
1541 * orphan list_head and handle it the same way as an inode deletion during
1542 * normal operation (which journals the operations for us).
1543 *
1544 * We only do an iget() and an iput() on each inode, which is very safe if we
1545 * accidentally point at an in-use or already deleted inode. The worst that
1546 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 1547 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 1548 * e2fsck was run on this filesystem, and it must have already done the orphan
1549 * inode cleanup for us, so we can safely abort without any further action.
1550 */
617ba13b
MC		 1551static void ext4_orphan_cleanup (struct super_block * sb,
1552 struct ext4_super_block * es)
ac27a0ec
DK		 1553{
1554 unsigned int s_flags = sb->s_flags;
1555 int nr_orphans = 0, nr_truncates = 0;
1556#ifdef CONFIG_QUOTA
1557 int i;
1558#endif
1559 if (!es->s_last_orphan) {
1560 jbd_debug(4, "no orphan inodes to clean up\n");
1561 return;
1562 }
1563
a8f48a95
ES		 1564 if (bdev_read_only(sb->s_bdev)) {
1565 printk(KERN_ERR "EXT4-fs: write access "
1566 "unavailable, skipping orphan cleanup.\n");
1567 return;
1568 }
1569
617ba13b 1570 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
ac27a0ec
DK		 1571 if (es->s_last_orphan)
1572 jbd_debug(1, "Errors on filesystem, "
1573 "clearing orphan list.\n");
1574 es->s_last_orphan = 0;
1575 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1576 return;
1577 }
1578
1579 if (s_flags & MS_RDONLY) {
617ba13b 1580 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n",
ac27a0ec
DK		 1581 sb->s_id);
1582 sb->s_flags &= ~MS_RDONLY;
1583 }
1584#ifdef CONFIG_QUOTA
1585 /* Needed for iput() to work correctly and not trash data */
1586 sb->s_flags |= MS_ACTIVE;
1587 /* Turn on quotas so that they are updated correctly */
1588 for (i = 0; i < MAXQUOTAS; i++) {
617ba13b
MC		 1589 if (EXT4_SB(sb)->s_qf_names[i]) {
1590 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec
DK		 1591 if (ret < 0)
1592 printk(KERN_ERR
617ba13b 1593 "EXT4-fs: Cannot turn on journalled "
ac27a0ec
DK		 1594 "quota: error %d\n", ret);
1595 }
1596 }
1597#endif
1598
1599 while (es->s_last_orphan) {
1600 struct inode *inode;
1601
1602 if (!(inode =
617ba13b 1603 ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
ac27a0ec
DK		 1604 es->s_last_orphan = 0;
1605 break;
1606 }
1607
617ba13b 1608 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
ac27a0ec
DK		 1609 DQUOT_INIT(inode);
1610 if (inode->i_nlink) {
1611 printk(KERN_DEBUG
1612 "%s: truncating inode %lu to %Ld bytes\n",
1613 __FUNCTION__, inode->i_ino, inode->i_size);
1614 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1615 inode->i_ino, inode->i_size);
617ba13b 1616 ext4_truncate(inode);
ac27a0ec
DK		 1617 nr_truncates++;
1618 } else {
1619 printk(KERN_DEBUG
1620 "%s: deleting unreferenced inode %lu\n",
1621 __FUNCTION__, inode->i_ino);
1622 jbd_debug(2, "deleting unreferenced inode %lu\n",
1623 inode->i_ino);
1624 nr_orphans++;
1625 }
1626 iput(inode); /* The delete magic happens here! */
1627 }
1628
1629#define PLURAL(x) (x), ((x)==1) ? "" : "s"
1630
1631 if (nr_orphans)
617ba13b 1632 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n",
ac27a0ec
DK		 1633 sb->s_id, PLURAL(nr_orphans));
1634 if (nr_truncates)
617ba13b 1635 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n",
ac27a0ec
DK		 1636 sb->s_id, PLURAL(nr_truncates));
1637#ifdef CONFIG_QUOTA
1638 /* Turn quotas off */
1639 for (i = 0; i < MAXQUOTAS; i++) {
1640 if (sb_dqopt(sb)->files[i])
1641 vfs_quota_off(sb, i);
1642 }
1643#endif
1644 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1645}
cd2291a4
ES		 1646/*
1647 * Maximal extent format file size.
1648 * Resulting logical blkno at s_maxbytes must fit in our on-disk
1649 * extent format containers, within a sector_t, and within i_blocks
1650 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
1651 * so that won't be a limiting factor.
1652 *
1653 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1654 */
1655static loff_t ext4_max_size(int blkbits)
1656{
1657 loff_t res;
1658 loff_t upper_limit = MAX_LFS_FILESIZE;
1659
1660 /* small i_blocks in vfs inode? */
1661 if (sizeof(blkcnt_t) < sizeof(u64)) {
1662 /*
1663 * CONFIG_LSF is not enabled implies the inode
1664 * i_block represent total blocks in 512 bytes
1665 * 32 == size of vfs inode i_blocks * 8
1666 */
1667 upper_limit = (1LL << 32) - 1;
1668
1669 /* total blocks in file system block size */
1670 upper_limit >>= (blkbits - 9);
1671 upper_limit <<= blkbits;
1672 }
1673
1674 /* 32-bit extent-start container, ee_block */
1675 res = 1LL << 32;
1676 res <<= blkbits;
1677 res -= 1;
1678
1679 /* Sanity check against vm- & vfs- imposed limits */
1680 if (res > upper_limit)
1681 res = upper_limit;
1682
1683 return res;
1684}
ac27a0ec 1685
ac27a0ec 1686/*
cd2291a4 1687 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 1688 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
1689 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 1690 */
cd2291a4 1691static loff_t ext4_max_bitmap_size(int bits)
ac27a0ec 1692{
617ba13b 1693 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 1694 int meta_blocks;
1695 loff_t upper_limit;
1696 /* This is calculated to be the largest file size for a
cd2291a4 1697 * dense, bitmapped file such that the total number of
ac27a0ec 1698 * sectors in the file, including data and all indirect blocks,
0fc1b451
AK		 1699 * does not exceed 2^48 -1
1700 * __u32 i_blocks_lo and _u16 i_blocks_high representing the
1701 * total number of 512 bytes blocks of the file
1702 */
1703
1704 if (sizeof(blkcnt_t) < sizeof(u64)) {
1705 /*
1706 * CONFIG_LSF is not enabled implies the inode
1707 * i_block represent total blocks in 512 bytes
1708 * 32 == size of vfs inode i_blocks * 8
1709 */
1710 upper_limit = (1LL << 32) - 1;
1711
1712 /* total blocks in file system block size */
1713 upper_limit >>= (bits - 9);
1714
1715 } else {
8180a562
AK		 1716 /*
1717 * We use 48 bit ext4_inode i_blocks
1718 * With EXT4_HUGE_FILE_FL set the i_blocks
1719 * represent total number of blocks in
1720 * file system block size
1721 */
0fc1b451
AK		 1722 upper_limit = (1LL << 48) - 1;
1723
0fc1b451
AK		 1724 }
1725
1726 /* indirect blocks */
1727 meta_blocks = 1;
1728 /* double indirect blocks */
1729 meta_blocks += 1 + (1LL << (bits-2));
1730 /* tripple indirect blocks */
1731 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1732
1733 upper_limit -= meta_blocks;
1734 upper_limit <<= bits;
ac27a0ec
DK		 1735
1736 res += 1LL << (bits-2);
1737 res += 1LL << (2*(bits-2));
1738 res += 1LL << (3*(bits-2));
1739 res <<= bits;
1740 if (res > upper_limit)
1741 res = upper_limit;
0fc1b451
AK		 1742
1743 if (res > MAX_LFS_FILESIZE)
1744 res = MAX_LFS_FILESIZE;
1745
ac27a0ec
DK		 1746 return res;
1747}
1748
617ba13b 1749static ext4_fsblk_t descriptor_loc(struct super_block *sb,
70bbb3e0 1750 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 1751{
617ba13b 1752 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 1753 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 1754 int has_super = 0;
1755
1756 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1757
617ba13b 1758 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 1759 nr < first_meta_bg)
70bbb3e0 1760 return logical_sb_block + nr + 1;
ac27a0ec 1761 bg = sbi->s_desc_per_block * nr;
617ba13b 1762 if (ext4_bg_has_super(sb, bg))
ac27a0ec 1763 has_super = 1;
617ba13b 1764 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 1765}
1766
c9de560d
AT		 1767/**
1768 * ext4_get_stripe_size: Get the stripe size.
1769 * @sbi: In memory super block info
1770 *
1771 * If we have specified it via mount option, then
1772 * use the mount option value. If the value specified at mount time is
1773 * greater than the blocks per group use the super block value.
1774 * If the super block value is greater than blocks per group return 0.
1775 * Allocator needs it be less than blocks per group.
1776 *
1777 */
1778static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
1779{
1780 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
1781 unsigned long stripe_width =
1782 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
1783
1784 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
1785 return sbi->s_stripe;
1786
1787 if (stripe_width <= sbi->s_blocks_per_group)
1788 return stripe_width;
1789
1790 if (stride <= sbi->s_blocks_per_group)
1791 return stride;
1792
1793 return 0;
1794}
ac27a0ec 1795
617ba13b 1796static int ext4_fill_super (struct super_block *sb, void *data, int silent)
1d03ec98
AK		 1797 __releases(kernel_sem)
1798 __acquires(kernel_sem)
1799
ac27a0ec
DK		 1800{
1801 struct buffer_head * bh;
617ba13b
MC		 1802 struct ext4_super_block *es = NULL;
1803 struct ext4_sb_info *sbi;
1804 ext4_fsblk_t block;
1805 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 1806 ext4_fsblk_t logical_sb_block;
ac27a0ec
DK		 1807 unsigned long offset = 0;
1808 unsigned int journal_inum = 0;
1809 unsigned long journal_devnum = 0;
1810 unsigned long def_mount_opts;
1811 struct inode *root;
1812 int blocksize;
1813 int hblock;
1814 int db_count;
1815 int i;
1816 int needs_recovery;
1817 __le32 features;
bd81d8ee 1818 __u64 blocks_count;
833f4077 1819 int err;
ac27a0ec
DK		 1820
1821 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1822 if (!sbi)
1823 return -ENOMEM;
1824 sb->s_fs_info = sbi;
1825 sbi->s_mount_opt = 0;
617ba13b
MC		 1826 sbi->s_resuid = EXT4_DEF_RESUID;
1827 sbi->s_resgid = EXT4_DEF_RESGID;
d9c9bef1 1828 sbi->s_sb_block = sb_block;
ac27a0ec
DK		 1829
1830 unlock_kernel();
1831
617ba13b 1832 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 1833 if (!blocksize) {
617ba13b 1834 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n");
ac27a0ec
DK		 1835 goto out_fail;
1836 }
1837
afc7cbca
TS		 1838 if (!sb_set_blocksize(sb, blocksize)) {
1839 printk(KERN_ERR "EXT4-fs: bad blocksize %d.\n", blocksize);
1840 goto out_fail;
1841 }
1842
ac27a0ec 1843 /*
617ba13b 1844 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 1845 * block sizes. We need to calculate the offset from buffer start.
1846 */
617ba13b 1847 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 1848 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1849 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 1850 } else {
70bbb3e0 1851 logical_sb_block = sb_block;
ac27a0ec
DK		 1852 }
1853
70bbb3e0 1854 if (!(bh = sb_bread(sb, logical_sb_block))) {
617ba13b 1855 printk (KERN_ERR "EXT4-fs: unable to read superblock\n");
ac27a0ec
DK		 1856 goto out_fail;
1857 }
1858 /*
1859 * Note: s_es must be initialized as soon as possible because
617ba13b 1860 * some ext4 macro-instructions depend on its value
ac27a0ec 1861 */
617ba13b 1862 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
ac27a0ec
DK		 1863 sbi->s_es = es;
1864 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 1865 if (sb->s_magic != EXT4_SUPER_MAGIC)
1866 goto cantfind_ext4;
ac27a0ec
DK		 1867
1868 /* Set defaults before we parse the mount options */
1869 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
617ba13b 1870 if (def_mount_opts & EXT4_DEFM_DEBUG)
ac27a0ec 1871 set_opt(sbi->s_mount_opt, DEBUG);
617ba13b 1872 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
ac27a0ec 1873 set_opt(sbi->s_mount_opt, GRPID);
617ba13b 1874 if (def_mount_opts & EXT4_DEFM_UID16)
ac27a0ec 1875 set_opt(sbi->s_mount_opt, NO_UID32);
2e7842b8 1876#ifdef CONFIG_EXT4DEV_FS_XATTR
617ba13b 1877 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
ac27a0ec 1878 set_opt(sbi->s_mount_opt, XATTR_USER);
2e7842b8
HD		 1879#endif
1880#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
617ba13b 1881 if (def_mount_opts & EXT4_DEFM_ACL)
ac27a0ec 1882 set_opt(sbi->s_mount_opt, POSIX_ACL);
2e7842b8 1883#endif
617ba13b
MC		 1884 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
1885 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
1886 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
1887 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
1888 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
1889 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
1890
1891 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
ac27a0ec 1892 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
bb4f397a 1893 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
ceea16bf 1894 set_opt(sbi->s_mount_opt, ERRORS_CONT);
bb4f397a
AK		 1895 else
1896 set_opt(sbi->s_mount_opt, ERRORS_RO);
ac27a0ec
DK		 1897
1898 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1899 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1900
1901 set_opt(sbi->s_mount_opt, RESERVATION);
1902
1e2462f9
MC		 1903 /*
1904 * turn on extents feature by default in ext4 filesystem
1905 * User -o noextents to turn it off
1906 */
1907 set_opt(sbi->s_mount_opt, EXTENTS);
3dbd0ede
AK		 1908 /*
1909 * turn on mballoc feature by default in ext4 filesystem
1910 * User -o nomballoc to turn it off
1911 */
1912 set_opt(sbi->s_mount_opt, MBALLOC);
1e2462f9 1913
ac27a0ec
DK		 1914 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1915 NULL, 0))
1916 goto failed_mount;
1917
1918 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
617ba13b 1919 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 1920
617ba13b
MC		 1921 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
1922 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
1923 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1924 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
ac27a0ec 1925 printk(KERN_WARNING
617ba13b 1926 "EXT4-fs warning: feature flags set on rev 0 fs, "
ac27a0ec
DK		 1927 "running e2fsck is recommended\n");
1928 /*
1929 * Check feature flags regardless of the revision level, since we
1930 * previously didn't change the revision level when setting the flags,
1931 * so there is a chance incompat flags are set on a rev 0 filesystem.
1932 */
617ba13b 1933 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
ac27a0ec 1934 if (features) {
617ba13b 1935 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of "
ac27a0ec
DK		 1936 "unsupported optional features (%x).\n",
1937 sb->s_id, le32_to_cpu(features));
1938 goto failed_mount;
1939 }
617ba13b 1940 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
ac27a0ec 1941 if (!(sb->s_flags & MS_RDONLY) && features) {
617ba13b 1942 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of "
ac27a0ec
DK		 1943 "unsupported optional features (%x).\n",
1944 sb->s_id, le32_to_cpu(features));
1945 goto failed_mount;
1946 }
0fc1b451
AK		 1947 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
1948 /*
1949 * Large file size enabled file system can only be
1950 * mount if kernel is build with CONFIG_LSF
1951 */
1952 if (sizeof(root->i_blocks) < sizeof(u64) &&
1953 !(sb->s_flags & MS_RDONLY)) {
1954 printk(KERN_ERR "EXT4-fs: %s: Filesystem with huge "
1955 "files cannot be mounted read-write "
1956 "without CONFIG_LSF.\n", sb->s_id);
1957 goto failed_mount;
1958 }
1959 }
ac27a0ec
DK		 1960 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1961
617ba13b
MC		 1962 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
1963 blocksize > EXT4_MAX_BLOCK_SIZE) {
ac27a0ec 1964 printk(KERN_ERR
617ba13b 1965 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
ac27a0ec
DK		 1966 blocksize, sb->s_id);
1967 goto failed_mount;
1968 }
1969
1970 hblock = bdev_hardsect_size(sb->s_bdev);
1971 if (sb->s_blocksize != blocksize) {
1972 /*
1973 * Make sure the blocksize for the filesystem is larger
1974 * than the hardware sectorsize for the machine.
1975 */
1976 if (blocksize < hblock) {
617ba13b 1977 printk(KERN_ERR "EXT4-fs: blocksize %d too small for "
ac27a0ec
DK		 1978 "device blocksize %d.\n", blocksize, hblock);
1979 goto failed_mount;
1980 }
1981
1982 brelse (bh);
1983 sb_set_blocksize(sb, blocksize);
70bbb3e0
AM		 1984 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1985 offset = do_div(logical_sb_block, blocksize);
1986 bh = sb_bread(sb, logical_sb_block);
ac27a0ec
DK		 1987 if (!bh) {
1988 printk(KERN_ERR
617ba13b 1989 "EXT4-fs: Can't read superblock on 2nd try.\n");
ac27a0ec
DK		 1990 goto failed_mount;
1991 }
617ba13b 1992 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
ac27a0ec 1993 sbi->s_es = es;
617ba13b 1994 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
ac27a0ec 1995 printk (KERN_ERR
617ba13b 1996 "EXT4-fs: Magic mismatch, very weird !\n");
ac27a0ec
DK		 1997 goto failed_mount;
1998 }
1999 }
2000
e2b46574 2001 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits);
617ba13b 2002 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits);
ac27a0ec 2003
617ba13b
MC		 2004 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
2005 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
2006 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 2007 } else {
2008 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
2009 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 2010 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 2011 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec
DK		 2012 (sbi->s_inode_size > blocksize)) {
2013 printk (KERN_ERR
617ba13b 2014 "EXT4-fs: unsupported inode size: %d\n",
ac27a0ec
DK		 2015 sbi->s_inode_size);
2016 goto failed_mount;
2017 }
ef7f3835
KS		 2018 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
2019 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 2020 }
0d1ee42f
AR		 2021 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
2022 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 2023 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 2024 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 2025 !is_power_of_2(sbi->s_desc_size)) {
0d1ee42f 2026 printk(KERN_ERR
8fadc143 2027 "EXT4-fs: unsupported descriptor size %lu\n",
0d1ee42f
AR		 2028 sbi->s_desc_size);
2029 goto failed_mount;
2030 }
2031 } else
2032 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
ac27a0ec 2033 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 2034 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 2035 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b
MC		 2036 goto cantfind_ext4;
2037 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 2038 if (sbi->s_inodes_per_block == 0)
617ba13b 2039 goto cantfind_ext4;
ac27a0ec
DK		 2040 sbi->s_itb_per_group = sbi->s_inodes_per_group /
2041 sbi->s_inodes_per_block;
0d1ee42f 2042 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 2043 sbi->s_sbh = bh;
2044 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 2045 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
2046 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
ac27a0ec
DK		 2047 for (i=0; i < 4; i++)
2048 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
2049 sbi->s_def_hash_version = es->s_def_hash_version;
2050
2051 if (sbi->s_blocks_per_group > blocksize * 8) {
2052 printk (KERN_ERR
617ba13b 2053 "EXT4-fs: #blocks per group too big: %lu\n",
ac27a0ec
DK		 2054 sbi->s_blocks_per_group);
2055 goto failed_mount;
2056 }
ac27a0ec
DK		 2057 if (sbi->s_inodes_per_group > blocksize * 8) {
2058 printk (KERN_ERR
617ba13b 2059 "EXT4-fs: #inodes per group too big: %lu\n",
ac27a0ec
DK		 2060 sbi->s_inodes_per_group);
2061 goto failed_mount;
2062 }
2063
bd81d8ee 2064 if (ext4_blocks_count(es) >
ac27a0ec 2065 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
617ba13b 2066 printk(KERN_ERR "EXT4-fs: filesystem on %s:"
ac27a0ec
DK		 2067 " too large to mount safely\n", sb->s_id);
2068 if (sizeof(sector_t) < 8)
617ba13b 2069 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not "
ac27a0ec
DK		 2070 "enabled\n");
2071 goto failed_mount;
2072 }
2073
617ba13b
MC		 2074 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
2075 goto cantfind_ext4;
e7c95593
ES		 2076
2077 /* ensure blocks_count calculation below doesn't sign-extend */
2078 if (ext4_blocks_count(es) + EXT4_BLOCKS_PER_GROUP(sb) <
2079 le32_to_cpu(es->s_first_data_block) + 1) {
2080 printk(KERN_WARNING "EXT4-fs: bad geometry: block count %llu, "
2081 "first data block %u, blocks per group %lu\n",
2082 ext4_blocks_count(es),
2083 le32_to_cpu(es->s_first_data_block),
2084 EXT4_BLOCKS_PER_GROUP(sb));
2085 goto failed_mount;
2086 }
bd81d8ee
LV		 2087 blocks_count = (ext4_blocks_count(es) -
2088 le32_to_cpu(es->s_first_data_block) +
2089 EXT4_BLOCKS_PER_GROUP(sb) - 1);
2090 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
2091 sbi->s_groups_count = blocks_count;
617ba13b
MC		 2092 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
2093 EXT4_DESC_PER_BLOCK(sb);
ac27a0ec
DK		 2094 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
2095 GFP_KERNEL);
2096 if (sbi->s_group_desc == NULL) {
617ba13b 2097 printk (KERN_ERR "EXT4-fs: not enough memory\n");
ac27a0ec
DK		 2098 goto failed_mount;
2099 }
2100
2101 bgl_lock_init(&sbi->s_blockgroup_lock);
2102
2103 for (i = 0; i < db_count; i++) {
70bbb3e0 2104 block = descriptor_loc(sb, logical_sb_block, i);
ac27a0ec
DK		 2105 sbi->s_group_desc[i] = sb_bread(sb, block);
2106 if (!sbi->s_group_desc[i]) {
617ba13b 2107 printk (KERN_ERR "EXT4-fs: "
ac27a0ec
DK		 2108 "can't read group descriptor %d\n", i);
2109 db_count = i;
2110 goto failed_mount2;
2111 }
2112 }
617ba13b
MC		 2113 if (!ext4_check_descriptors (sb)) {
2114 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
ac27a0ec
DK		 2115 goto failed_mount2;
2116 }
2117 sbi->s_gdb_count = db_count;
2118 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
2119 spin_lock_init(&sbi->s_next_gen_lock);
2120
833f4077
PZ		 2121 err = percpu_counter_init(&sbi->s_freeblocks_counter,
2122 ext4_count_free_blocks(sb));
2123 if (!err) {
2124 err = percpu_counter_init(&sbi->s_freeinodes_counter,
2125 ext4_count_free_inodes(sb));
2126 }
2127 if (!err) {
2128 err = percpu_counter_init(&sbi->s_dirs_counter,
2129 ext4_count_dirs(sb));
2130 }
2131 if (err) {
2132 printk(KERN_ERR "EXT4-fs: insufficient memory\n");
2133 goto failed_mount3;
2134 }
ac27a0ec
DK		 2135
2136 /* per fileystem reservation list head & lock */
2137 spin_lock_init(&sbi->s_rsv_window_lock);
2138 sbi->s_rsv_window_root = RB_ROOT;
2139 /* Add a single, static dummy reservation to the start of the
2140 * reservation window list --- it gives us a placeholder for
2141 * append-at-start-of-list which makes the allocation logic
2142 * _much_ simpler. */
617ba13b
MC		 2143 sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
2144 sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
ac27a0ec
DK		 2145 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
2146 sbi->s_rsv_window_head.rsv_goal_size = 0;
617ba13b 2147 ext4_rsv_window_add(sb, &sbi->s_rsv_window_head);
ac27a0ec 2148
c9de560d
AT		 2149 sbi->s_stripe = ext4_get_stripe_size(sbi);
2150
ac27a0ec
DK		 2151 /*
2152 * set up enough so that it can read an inode
2153 */
617ba13b
MC		 2154 sb->s_op = &ext4_sops;
2155 sb->s_export_op = &ext4_export_ops;
2156 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 2157#ifdef CONFIG_QUOTA
617ba13b
MC		 2158 sb->s_qcop = &ext4_qctl_operations;
2159 sb->dq_op = &ext4_quota_operations;
ac27a0ec
DK		 2160#endif
2161 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
2162
2163 sb->s_root = NULL;
2164
2165 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 2166 EXT4_HAS_INCOMPAT_FEATURE(sb,
2167 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec
DK		 2168
2169 /*
2170 * The first inode we look at is the journal inode. Don't try
2171 * root first: it may be modified in the journal!
2172 */
2173 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 2174 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
2175 if (ext4_load_journal(sb, es, journal_devnum))
ac27a0ec
DK		 2176 goto failed_mount3;
2177 } else if (journal_inum) {
617ba13b 2178 if (ext4_create_journal(sb, es, journal_inum))
ac27a0ec
DK		 2179 goto failed_mount3;
2180 } else {
2181 if (!silent)
2182 printk (KERN_ERR
617ba13b 2183 "ext4: No journal on filesystem on %s\n",
ac27a0ec
DK		 2184 sb->s_id);
2185 goto failed_mount3;
2186 }
2187
eb40a09c
JS		 2188 if (ext4_blocks_count(es) > 0xffffffffULL &&
2189 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
2190 JBD2_FEATURE_INCOMPAT_64BIT)) {
2191 printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n");
2192 goto failed_mount4;
2193 }
2194
818d276c
GS		 2195 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2196 jbd2_journal_set_features(sbi->s_journal,
2197 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2198 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2199 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2200 jbd2_journal_set_features(sbi->s_journal,
2201 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
2202 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2203 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2204 } else {
2205 jbd2_journal_clear_features(sbi->s_journal,
2206 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2207 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2208 }
2209
ac27a0ec
DK		 2210 /* We have now updated the journal if required, so we can
2211 * validate the data journaling mode. */
2212 switch (test_opt(sb, DATA_FLAGS)) {
2213 case 0:
2214 /* No mode set, assume a default based on the journal
63f57933
AM		 2215 * capabilities: ORDERED_DATA if the journal can
2216 * cope, else JOURNAL_DATA
2217 */
dab291af
MC		 2218 if (jbd2_journal_check_available_features
2219 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
ac27a0ec
DK		 2220 set_opt(sbi->s_mount_opt, ORDERED_DATA);
2221 else
2222 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2223 break;
2224
617ba13b
MC		 2225 case EXT4_MOUNT_ORDERED_DATA:
2226 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 2227 if (!jbd2_journal_check_available_features
2228 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
617ba13b 2229 printk(KERN_ERR "EXT4-fs: Journal does not support "
ac27a0ec
DK		 2230 "requested data journaling mode\n");
2231 goto failed_mount4;
2232 }
2233 default:
2234 break;
2235 }
2236
2237 if (test_opt(sb, NOBH)) {
617ba13b
MC		 2238 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
2239 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - "
ac27a0ec
DK		 2240 "its supported only with writeback mode\n");
2241 clear_opt(sbi->s_mount_opt, NOBH);
2242 }
2243 }
2244 /*
dab291af 2245 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 2246 * so we can safely mount the rest of the filesystem now.
2247 */
2248
617ba13b 2249 root = iget(sb, EXT4_ROOT_INO);
ac27a0ec
DK		 2250 sb->s_root = d_alloc_root(root);
2251 if (!sb->s_root) {
617ba13b 2252 printk(KERN_ERR "EXT4-fs: get root inode failed\n");
ac27a0ec
DK		 2253 iput(root);
2254 goto failed_mount4;
2255 }
2256 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
2257 dput(sb->s_root);
2258 sb->s_root = NULL;
617ba13b 2259 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
ac27a0ec
DK		 2260 goto failed_mount4;
2261 }
2262
617ba13b 2263 ext4_setup_super (sb, es, sb->s_flags & MS_RDONLY);
ef7f3835
KS		 2264
2265 /* determine the minimum size of new large inodes, if present */
2266 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
2267 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2268 EXT4_GOOD_OLD_INODE_SIZE;
2269 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2270 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2271 if (sbi->s_want_extra_isize <
2272 le16_to_cpu(es->s_want_extra_isize))
2273 sbi->s_want_extra_isize =
2274 le16_to_cpu(es->s_want_extra_isize);
2275 if (sbi->s_want_extra_isize <
2276 le16_to_cpu(es->s_min_extra_isize))
2277 sbi->s_want_extra_isize =
2278 le16_to_cpu(es->s_min_extra_isize);
2279 }
2280 }
2281 /* Check if enough inode space is available */
2282 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2283 sbi->s_inode_size) {
2284 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2285 EXT4_GOOD_OLD_INODE_SIZE;
2286 printk(KERN_INFO "EXT4-fs: required extra inode space not"
2287 "available.\n");
2288 }
2289
ac27a0ec
DK		 2290 /*
2291 * akpm: core read_super() calls in here with the superblock locked.
2292 * That deadlocks, because orphan cleanup needs to lock the superblock
2293 * in numerous places. Here we just pop the lock - it's relatively
2294 * harmless, because we are now ready to accept write_super() requests,
2295 * and aviro says that's the only reason for hanging onto the
2296 * superblock lock.
2297 */
617ba13b
MC		 2298 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
2299 ext4_orphan_cleanup(sb, es);
2300 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
ac27a0ec 2301 if (needs_recovery)
617ba13b
MC		 2302 printk (KERN_INFO "EXT4-fs: recovery complete.\n");
2303 ext4_mark_recovery_complete(sb, es);
2304 printk (KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n",
2305 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal":
2306 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered":
ac27a0ec
DK		 2307 "writeback");
2308
a86c6181 2309 ext4_ext_init(sb);
c9de560d 2310 ext4_mb_init(sb, needs_recovery);
a86c6181 2311
ac27a0ec
DK		 2312 lock_kernel();
2313 return 0;
2314
617ba13b 2315cantfind_ext4:
ac27a0ec 2316 if (!silent)
617ba13b 2317 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n",
ac27a0ec
DK		 2318 sb->s_id);
2319 goto failed_mount;
2320
2321failed_mount4:
dab291af 2322 jbd2_journal_destroy(sbi->s_journal);
ac27a0ec
DK		 2323failed_mount3:
2324 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2325 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2326 percpu_counter_destroy(&sbi->s_dirs_counter);
2327failed_mount2:
2328 for (i = 0; i < db_count; i++)
2329 brelse(sbi->s_group_desc[i]);
2330 kfree(sbi->s_group_desc);
2331failed_mount:
2332#ifdef CONFIG_QUOTA
2333 for (i = 0; i < MAXQUOTAS; i++)
2334 kfree(sbi->s_qf_names[i]);
2335#endif
617ba13b 2336 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 2337 brelse(bh);
2338out_fail:
2339 sb->s_fs_info = NULL;
2340 kfree(sbi);
2341 lock_kernel();
2342 return -EINVAL;
2343}
2344
2345/*
2346 * Setup any per-fs journal parameters now. We'll do this both on
2347 * initial mount, once the journal has been initialised but before we've
2348 * done any recovery; and again on any subsequent remount.
2349 */
617ba13b 2350static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 2351{
617ba13b 2352 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 2353
2354 if (sbi->s_commit_interval)
2355 journal->j_commit_interval = sbi->s_commit_interval;
617ba13b 2356 /* We could also set up an ext4-specific default for the commit
ac27a0ec
DK		 2357 * interval here, but for now we'll just fall back to the jbd
2358 * default. */
2359
2360 spin_lock(&journal->j_state_lock);
2361 if (test_opt(sb, BARRIER))
dab291af 2362 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 2363 else
dab291af 2364 journal->j_flags &= ~JBD2_BARRIER;
ac27a0ec
DK		 2365 spin_unlock(&journal->j_state_lock);
2366}
2367
617ba13b 2368static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 2369 unsigned int journal_inum)
2370{
2371 struct inode *journal_inode;
2372 journal_t *journal;
2373
2374 /* First, test for the existence of a valid inode on disk. Bad
2375 * things happen if we iget() an unused inode, as the subsequent
2376 * iput() will try to delete it. */
2377
2378 journal_inode = iget(sb, journal_inum);
2379 if (!journal_inode) {
617ba13b 2380 printk(KERN_ERR "EXT4-fs: no journal found.\n");
ac27a0ec
DK		 2381 return NULL;
2382 }
2383 if (!journal_inode->i_nlink) {
2384 make_bad_inode(journal_inode);
2385 iput(journal_inode);
617ba13b 2386 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n");
ac27a0ec
DK		 2387 return NULL;
2388 }
2389
2390 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2391 journal_inode, journal_inode->i_size);
2392 if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
617ba13b 2393 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
ac27a0ec
DK		 2394 iput(journal_inode);
2395 return NULL;
2396 }
2397
dab291af 2398 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 2399 if (!journal) {
617ba13b 2400 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n");
ac27a0ec
DK		 2401 iput(journal_inode);
2402 return NULL;
2403 }
2404 journal->j_private = sb;
617ba13b 2405 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 2406 return journal;
2407}
2408
617ba13b 2409static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 2410 dev_t j_dev)
2411{
2412 struct buffer_head * bh;
2413 journal_t *journal;
617ba13b
MC		 2414 ext4_fsblk_t start;
2415 ext4_fsblk_t len;
ac27a0ec 2416 int hblock, blocksize;
617ba13b 2417 ext4_fsblk_t sb_block;
ac27a0ec 2418 unsigned long offset;
617ba13b 2419 struct ext4_super_block * es;
ac27a0ec
DK		 2420 struct block_device *bdev;
2421
617ba13b 2422 bdev = ext4_blkdev_get(j_dev);
ac27a0ec
DK		 2423 if (bdev == NULL)
2424 return NULL;
2425
2426 if (bd_claim(bdev, sb)) {
2427 printk(KERN_ERR
8c55e204 2428 "EXT4: failed to claim external journal device.\n");
ac27a0ec
DK		 2429 blkdev_put(bdev);
2430 return NULL;
2431 }
2432
2433 blocksize = sb->s_blocksize;
2434 hblock = bdev_hardsect_size(bdev);
2435 if (blocksize < hblock) {
2436 printk(KERN_ERR
617ba13b 2437 "EXT4-fs: blocksize too small for journal device.\n");
ac27a0ec
DK		 2438 goto out_bdev;
2439 }
2440
617ba13b
MC		 2441 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
2442 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 2443 set_blocksize(bdev, blocksize);
2444 if (!(bh = __bread(bdev, sb_block, blocksize))) {
617ba13b 2445 printk(KERN_ERR "EXT4-fs: couldn't read superblock of "
ac27a0ec
DK		 2446 "external journal\n");
2447 goto out_bdev;
2448 }
2449
617ba13b
MC		 2450 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2451 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 2452 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b
MC		 2453 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2454 printk(KERN_ERR "EXT4-fs: external journal has "
ac27a0ec
DK		 2455 "bad superblock\n");
2456 brelse(bh);
2457 goto out_bdev;
2458 }
2459
617ba13b
MC		 2460 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2461 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n");
ac27a0ec
DK		 2462 brelse(bh);
2463 goto out_bdev;
2464 }
2465
bd81d8ee 2466 len = ext4_blocks_count(es);
ac27a0ec
DK		 2467 start = sb_block + 1;
2468 brelse(bh); /* we're done with the superblock */
2469
dab291af 2470 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 2471 start, len, blocksize);
2472 if (!journal) {
617ba13b 2473 printk(KERN_ERR "EXT4-fs: failed to create device journal\n");
ac27a0ec
DK		 2474 goto out_bdev;
2475 }
2476 journal->j_private = sb;
2477 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2478 wait_on_buffer(journal->j_sb_buffer);
2479 if (!buffer_uptodate(journal->j_sb_buffer)) {
617ba13b 2480 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n");
ac27a0ec
DK		 2481 goto out_journal;
2482 }
2483 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
617ba13b 2484 printk(KERN_ERR "EXT4-fs: External journal has more than one "
ac27a0ec
DK		 2485 "user (unsupported) - %d\n",
2486 be32_to_cpu(journal->j_superblock->s_nr_users));
2487 goto out_journal;
2488 }
617ba13b
MC		 2489 EXT4_SB(sb)->journal_bdev = bdev;
2490 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 2491 return journal;
2492out_journal:
dab291af 2493 jbd2_journal_destroy(journal);
ac27a0ec 2494out_bdev:
617ba13b 2495 ext4_blkdev_put(bdev);
ac27a0ec
DK		 2496 return NULL;
2497}
2498
617ba13b
MC		 2499static int ext4_load_journal(struct super_block *sb,
2500 struct ext4_super_block *es,
ac27a0ec
DK		 2501 unsigned long journal_devnum)
2502{
2503 journal_t *journal;
2504 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2505 dev_t journal_dev;
2506 int err = 0;
2507 int really_read_only;
2508
2509 if (journal_devnum &&
2510 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
617ba13b 2511 printk(KERN_INFO "EXT4-fs: external journal device major/minor "
ac27a0ec
DK		 2512 "numbers have changed\n");
2513 journal_dev = new_decode_dev(journal_devnum);
2514 } else
2515 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2516
2517 really_read_only = bdev_read_only(sb->s_bdev);
2518
2519 /*
2520 * Are we loading a blank journal or performing recovery after a
2521 * crash? For recovery, we need to check in advance whether we
2522 * can get read-write access to the device.
2523 */
2524
617ba13b 2525 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 2526 if (sb->s_flags & MS_RDONLY) {
617ba13b 2527 printk(KERN_INFO "EXT4-fs: INFO: recovery "
ac27a0ec
DK		 2528 "required on readonly filesystem.\n");
2529 if (really_read_only) {
617ba13b 2530 printk(KERN_ERR "EXT4-fs: write access "
ac27a0ec
DK		 2531 "unavailable, cannot proceed.\n");
2532 return -EROFS;
2533 }
617ba13b 2534 printk (KERN_INFO "EXT4-fs: write access will "
ac27a0ec
DK		 2535 "be enabled during recovery.\n");
2536 }
2537 }
2538
2539 if (journal_inum && journal_dev) {
617ba13b 2540 printk(KERN_ERR "EXT4-fs: filesystem has both journal "
ac27a0ec
DK		 2541 "and inode journals!\n");
2542 return -EINVAL;
2543 }
2544
2545 if (journal_inum) {
617ba13b 2546 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 2547 return -EINVAL;
2548 } else {
617ba13b 2549 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 2550 return -EINVAL;
2551 }
2552
2553 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
dab291af 2554 err = jbd2_journal_update_format(journal);
ac27a0ec 2555 if (err) {
617ba13b 2556 printk(KERN_ERR "EXT4-fs: error updating journal.\n");
dab291af 2557 jbd2_journal_destroy(journal);
ac27a0ec
DK		 2558 return err;
2559 }
2560 }
2561
617ba13b 2562 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 2563 err = jbd2_journal_wipe(journal, !really_read_only);
ac27a0ec 2564 if (!err)
dab291af 2565 err = jbd2_journal_load(journal);
ac27a0ec
DK		 2566
2567 if (err) {
617ba13b 2568 printk(KERN_ERR "EXT4-fs: error loading journal.\n");
dab291af 2569 jbd2_journal_destroy(journal);
ac27a0ec
DK		 2570 return err;
2571 }
2572
617ba13b
MC		 2573 EXT4_SB(sb)->s_journal = journal;
2574 ext4_clear_journal_err(sb, es);
ac27a0ec
DK		 2575
2576 if (journal_devnum &&
2577 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2578 es->s_journal_dev = cpu_to_le32(journal_devnum);
2579 sb->s_dirt = 1;
2580
2581 /* Make sure we flush the recovery flag to disk. */
617ba13b 2582 ext4_commit_super(sb, es, 1);
ac27a0ec
DK		 2583 }
2584
2585 return 0;
2586}
2587
617ba13b
MC		 2588static int ext4_create_journal(struct super_block * sb,
2589 struct ext4_super_block * es,
ac27a0ec
DK		 2590 unsigned int journal_inum)
2591{
2592 journal_t *journal;
6c675bd4 2593 int err;
ac27a0ec
DK		 2594
2595 if (sb->s_flags & MS_RDONLY) {
617ba13b 2596 printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to "
ac27a0ec
DK		 2597 "create journal.\n");
2598 return -EROFS;
2599 }
2600
6c675bd4
BP		 2601 journal = ext4_get_journal(sb, journal_inum);
2602 if (!journal)
ac27a0ec
DK		 2603 return -EINVAL;
2604
617ba13b 2605 printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n",
ac27a0ec
DK		 2606 journal_inum);
2607
6c675bd4
BP		 2608 err = jbd2_journal_create(journal);
2609 if (err) {
617ba13b 2610 printk(KERN_ERR "EXT4-fs: error creating journal.\n");
dab291af 2611 jbd2_journal_destroy(journal);
ac27a0ec
DK		 2612 return -EIO;
2613 }
2614
617ba13b 2615 EXT4_SB(sb)->s_journal = journal;
ac27a0ec 2616
617ba13b
MC		 2617 ext4_update_dynamic_rev(sb);
2618 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2619 EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL);
ac27a0ec
DK		 2620
2621 es->s_journal_inum = cpu_to_le32(journal_inum);
2622 sb->s_dirt = 1;
2623
2624 /* Make sure we flush the recovery flag to disk. */
617ba13b 2625 ext4_commit_super(sb, es, 1);
ac27a0ec
DK		 2626
2627 return 0;
2628}
2629
617ba13b
MC		 2630static void ext4_commit_super (struct super_block * sb,
2631 struct ext4_super_block * es,
ac27a0ec
DK		 2632 int sync)
2633{
617ba13b 2634 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
ac27a0ec
DK		 2635
2636 if (!sbh)
2637 return;
2638 es->s_wtime = cpu_to_le32(get_seconds());
bd81d8ee 2639 ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb));
617ba13b 2640 es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 2641 BUFFER_TRACE(sbh, "marking dirty");
2642 mark_buffer_dirty(sbh);
2643 if (sync)
2644 sync_dirty_buffer(sbh);
2645}
2646
2647
2648/*
2649 * Have we just finished recovery? If so, and if we are mounting (or
2650 * remounting) the filesystem readonly, then we will end up with a
2651 * consistent fs on disk. Record that fact.
2652 */
617ba13b
MC		 2653static void ext4_mark_recovery_complete(struct super_block * sb,
2654 struct ext4_super_block * es)
ac27a0ec 2655{
617ba13b 2656 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 2657
dab291af
MC		 2658 jbd2_journal_lock_updates(journal);
2659 jbd2_journal_flush(journal);
32c37730 2660 lock_super(sb);
617ba13b 2661 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 2662 sb->s_flags & MS_RDONLY) {
617ba13b 2663 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 2664 sb->s_dirt = 0;
617ba13b 2665 ext4_commit_super(sb, es, 1);
ac27a0ec 2666 }
32c37730 2667 unlock_super(sb);
dab291af 2668 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 2669}
2670
2671/*
2672 * If we are mounting (or read-write remounting) a filesystem whose journal
2673 * has recorded an error from a previous lifetime, move that error to the
2674 * main filesystem now.
2675 */
617ba13b
MC		 2676static void ext4_clear_journal_err(struct super_block * sb,
2677 struct ext4_super_block * es)
ac27a0ec
DK		 2678{
2679 journal_t *journal;
2680 int j_errno;
2681 const char *errstr;
2682
617ba13b 2683 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 2684
2685 /*
2686 * Now check for any error status which may have been recorded in the
617ba13b 2687 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 2688 */
2689
dab291af 2690 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 2691 if (j_errno) {
2692 char nbuf[16];
2693
617ba13b
MC		 2694 errstr = ext4_decode_error(sb, j_errno, nbuf);
2695 ext4_warning(sb, __FUNCTION__, "Filesystem error recorded "
ac27a0ec 2696 "from previous mount: %s", errstr);
617ba13b 2697 ext4_warning(sb, __FUNCTION__, "Marking fs in need of "
ac27a0ec
DK		 2698 "filesystem check.");
2699
617ba13b
MC		 2700 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2701 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2702 ext4_commit_super (sb, es, 1);
ac27a0ec 2703
dab291af 2704 jbd2_journal_clear_err(journal);
ac27a0ec
DK		 2705 }
2706}
2707
2708/*
2709 * Force the running and committing transactions to commit,
2710 * and wait on the commit.
2711 */
617ba13b 2712int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 2713{
2714 journal_t *journal;
2715 int ret;
2716
2717 if (sb->s_flags & MS_RDONLY)
2718 return 0;
2719
617ba13b 2720 journal = EXT4_SB(sb)->s_journal;
ac27a0ec 2721 sb->s_dirt = 0;
617ba13b 2722 ret = ext4_journal_force_commit(journal);
ac27a0ec
DK		 2723 return ret;
2724}
2725
2726/*
617ba13b 2727 * Ext4 always journals updates to the superblock itself, so we don't
ac27a0ec
DK		 2728 * have to propagate any other updates to the superblock on disk at this
2729 * point. Just start an async writeback to get the buffers on their way
2730 * to the disk.
2731 *
2732 * This implicitly triggers the writebehind on sync().
2733 */
2734
617ba13b 2735static void ext4_write_super (struct super_block * sb)
ac27a0ec
DK		 2736{
2737 if (mutex_trylock(&sb->s_lock) != 0)
2738 BUG();
2739 sb->s_dirt = 0;
2740}
2741
617ba13b 2742static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec
DK		 2743{
2744 tid_t target;
2745
2746 sb->s_dirt = 0;
dab291af 2747 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) {
ac27a0ec 2748 if (wait)
dab291af 2749 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target);
ac27a0ec
DK		 2750 }
2751 return 0;
2752}
2753
2754/*
2755 * LVM calls this function before a (read-only) snapshot is created. This
2756 * gives us a chance to flush the journal completely and mark the fs clean.
2757 */
617ba13b 2758static void ext4_write_super_lockfs(struct super_block *sb)
ac27a0ec
DK		 2759{
2760 sb->s_dirt = 0;
2761
2762 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 2763 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 2764
2765 /* Now we set up the journal barrier. */
dab291af
MC		 2766 jbd2_journal_lock_updates(journal);
2767 jbd2_journal_flush(journal);
ac27a0ec
DK		 2768
2769 /* Journal blocked and flushed, clear needs_recovery flag. */
617ba13b
MC		 2770 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2771 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
ac27a0ec
DK		 2772 }
2773}
2774
2775/*
2776 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2777 * flag here, even though the filesystem is not technically dirty yet.
2778 */
617ba13b 2779static void ext4_unlockfs(struct super_block *sb)
ac27a0ec
DK		 2780{
2781 if (!(sb->s_flags & MS_RDONLY)) {
2782 lock_super(sb);
2783 /* Reser the needs_recovery flag before the fs is unlocked. */
617ba13b
MC		 2784 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2785 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
ac27a0ec 2786 unlock_super(sb);
dab291af 2787 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
ac27a0ec
DK		 2788 }
2789}
2790
617ba13b 2791static int ext4_remount (struct super_block * sb, int * flags, char * data)
ac27a0ec 2792{
617ba13b
MC		 2793 struct ext4_super_block * es;
2794 struct ext4_sb_info *sbi = EXT4_SB(sb);
2795 ext4_fsblk_t n_blocks_count = 0;
ac27a0ec 2796 unsigned long old_sb_flags;
617ba13b 2797 struct ext4_mount_options old_opts;
ac27a0ec
DK		 2798 int err;
2799#ifdef CONFIG_QUOTA
2800 int i;
2801#endif
2802
2803 /* Store the original options */
2804 old_sb_flags = sb->s_flags;
2805 old_opts.s_mount_opt = sbi->s_mount_opt;
2806 old_opts.s_resuid = sbi->s_resuid;
2807 old_opts.s_resgid = sbi->s_resgid;
2808 old_opts.s_commit_interval = sbi->s_commit_interval;
2809#ifdef CONFIG_QUOTA
2810 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2811 for (i = 0; i < MAXQUOTAS; i++)
2812 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2813#endif
2814
2815 /*
2816 * Allow the "check" option to be passed as a remount option.
2817 */
2818 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2819 err = -EINVAL;
2820 goto restore_opts;
2821 }
2822
617ba13b
MC		 2823 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT)
2824 ext4_abort(sb, __FUNCTION__, "Abort forced by user");
ac27a0ec
DK		 2825
2826 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
617ba13b 2827 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 2828
2829 es = sbi->s_es;
2830
617ba13b 2831 ext4_init_journal_params(sb, sbi->s_journal);
ac27a0ec
DK		 2832
2833 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
bd81d8ee 2834 n_blocks_count > ext4_blocks_count(es)) {
617ba13b 2835 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
ac27a0ec
DK		 2836 err = -EROFS;
2837 goto restore_opts;
2838 }
2839
2840 if (*flags & MS_RDONLY) {
2841 /*
2842 * First of all, the unconditional stuff we have to do
2843 * to disable replay of the journal when we next remount
2844 */
2845 sb->s_flags |= MS_RDONLY;
2846
2847 /*
2848 * OK, test if we are remounting a valid rw partition
2849 * readonly, and if so set the rdonly flag and then
2850 * mark the partition as valid again.
2851 */
617ba13b
MC		 2852 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
2853 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 2854 es->s_state = cpu_to_le16(sbi->s_mount_state);
2855
32c37730
JK		 2856 /*
2857 * We have to unlock super so that we can wait for
2858 * transactions.
2859 */
2860 unlock_super(sb);
617ba13b 2861 ext4_mark_recovery_complete(sb, es);
32c37730 2862 lock_super(sb);
ac27a0ec
DK		 2863 } else {
2864 __le32 ret;
617ba13b
MC		 2865 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
2866 ~EXT4_FEATURE_RO_COMPAT_SUPP))) {
2867 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
ac27a0ec
DK		 2868 "remount RDWR because of unsupported "
2869 "optional features (%x).\n",
2870 sb->s_id, le32_to_cpu(ret));
2871 err = -EROFS;
2872 goto restore_opts;
2873 }
ead6596b
ES		 2874
2875 /*
2876 * If we have an unprocessed orphan list hanging
2877 * around from a previously readonly bdev mount,
2878 * require a full umount/remount for now.
2879 */
2880 if (es->s_last_orphan) {
2881 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
2882 "remount RDWR because of unprocessed "
2883 "orphan inode list. Please "
2884 "umount/remount instead.\n",
2885 sb->s_id);
2886 err = -EINVAL;
2887 goto restore_opts;
2888 }
2889
ac27a0ec
DK		 2890 /*
2891 * Mounting a RDONLY partition read-write, so reread
2892 * and store the current valid flag. (It may have
2893 * been changed by e2fsck since we originally mounted
2894 * the partition.)
2895 */
617ba13b 2896 ext4_clear_journal_err(sb, es);
ac27a0ec 2897 sbi->s_mount_state = le16_to_cpu(es->s_state);
617ba13b 2898 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
ac27a0ec 2899 goto restore_opts;
617ba13b 2900 if (!ext4_setup_super (sb, es, 0))
ac27a0ec
DK		 2901 sb->s_flags &= ~MS_RDONLY;
2902 }
2903 }
2904#ifdef CONFIG_QUOTA
2905 /* Release old quota file names */
2906 for (i = 0; i < MAXQUOTAS; i++)
2907 if (old_opts.s_qf_names[i] &&
2908 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2909 kfree(old_opts.s_qf_names[i]);
2910#endif
2911 return 0;
2912restore_opts:
2913 sb->s_flags = old_sb_flags;
2914 sbi->s_mount_opt = old_opts.s_mount_opt;
2915 sbi->s_resuid = old_opts.s_resuid;
2916 sbi->s_resgid = old_opts.s_resgid;
2917 sbi->s_commit_interval = old_opts.s_commit_interval;
2918#ifdef CONFIG_QUOTA
2919 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2920 for (i = 0; i < MAXQUOTAS; i++) {
2921 if (sbi->s_qf_names[i] &&
2922 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2923 kfree(sbi->s_qf_names[i]);
2924 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2925 }
2926#endif
2927 return err;
2928}
2929
617ba13b 2930static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf)
ac27a0ec
DK		 2931{
2932 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 2933 struct ext4_sb_info *sbi = EXT4_SB(sb);
2934 struct ext4_super_block *es = sbi->s_es;
960cc398 2935 u64 fsid;
ac27a0ec 2936
5e70030d
BP		 2937 if (test_opt(sb, MINIX_DF)) {
2938 sbi->s_overhead_last = 0;
6bc9feff 2939 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
fd2d4291 2940 ext4_group_t ngroups = sbi->s_groups_count, i;
5e70030d 2941 ext4_fsblk_t overhead = 0;
ac27a0ec
DK		 2942 smp_rmb();
2943
2944 /*
5e70030d
BP		 2945 * Compute the overhead (FS structures). This is constant
2946 * for a given filesystem unless the number of block groups
2947 * changes so we cache the previous value until it does.
ac27a0ec
DK		 2948 */
2949
2950 /*
2951 * All of the blocks before first_data_block are
2952 * overhead
2953 */
2954 overhead = le32_to_cpu(es->s_first_data_block);
2955
2956 /*
2957 * Add the overhead attributed to the superblock and
2958 * block group descriptors. If the sparse superblocks
2959 * feature is turned on, then not all groups have this.
2960 */
2961 for (i = 0; i < ngroups; i++) {
617ba13b
MC		 2962 overhead += ext4_bg_has_super(sb, i) +
2963 ext4_bg_num_gdb(sb, i);
ac27a0ec
DK		 2964 cond_resched();
2965 }
2966
2967 /*
2968 * Every block group has an inode bitmap, a block
2969 * bitmap, and an inode table.
2970 */
5e70030d
BP		 2971 overhead += ngroups * (2 + sbi->s_itb_per_group);
2972 sbi->s_overhead_last = overhead;
2973 smp_wmb();
6bc9feff 2974 sbi->s_blocks_last = ext4_blocks_count(es);
ac27a0ec
DK		 2975 }
2976
617ba13b 2977 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 2978 buf->f_bsize = sb->s_blocksize;
5e70030d 2979 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
52d9f3b4 2980 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
308ba3ec 2981 ext4_free_blocks_count_set(es, buf->f_bfree);
bd81d8ee
LV		 2982 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
2983 if (buf->f_bfree < ext4_r_blocks_count(es))
ac27a0ec
DK		 2984 buf->f_bavail = 0;
2985 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 2986 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
5e70030d 2987 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
617ba13b 2988 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 2989 fsid = le64_to_cpup((void *)es->s_uuid) ^
2990 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2991 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2992 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
ac27a0ec
DK		 2993 return 0;
2994}
2995
2996/* Helper function for writing quotas on sync - we need to start transaction before quota file
2997 * is locked for write. Otherwise the are possible deadlocks:
2998 * Process 1 Process 2
617ba13b 2999 * ext4_create() quota_sync()
dab291af 3000 * jbd2_journal_start() write_dquot()
ac27a0ec 3001 * DQUOT_INIT() down(dqio_mutex)
dab291af 3002 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 3003 *
3004 */
3005
3006#ifdef CONFIG_QUOTA
3007
3008static inline struct inode *dquot_to_inode(struct dquot *dquot)
3009{
3010 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
3011}
3012
617ba13b 3013static int ext4_dquot_initialize(struct inode *inode, int type)
ac27a0ec
DK		 3014{
3015 handle_t *handle;
3016 int ret, err;
3017
3018 /* We may create quota structure so we need to reserve enough blocks */
617ba13b 3019 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb));
ac27a0ec
DK		 3020 if (IS_ERR(handle))
3021 return PTR_ERR(handle);
3022 ret = dquot_initialize(inode, type);
617ba13b 3023 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3024 if (!ret)
3025 ret = err;
3026 return ret;
3027}
3028
617ba13b 3029static int ext4_dquot_drop(struct inode *inode)
ac27a0ec
DK		 3030{
3031 handle_t *handle;
3032 int ret, err;
3033
3034 /* We may delete quota structure so we need to reserve enough blocks */
617ba13b 3035 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb));
ac27a0ec
DK		 3036 if (IS_ERR(handle))
3037 return PTR_ERR(handle);
3038 ret = dquot_drop(inode);
617ba13b 3039 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3040 if (!ret)
3041 ret = err;
3042 return ret;
3043}
3044
617ba13b 3045static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 3046{
3047 int ret, err;
3048 handle_t *handle;
3049 struct inode *inode;
3050
3051 inode = dquot_to_inode(dquot);
617ba13b
MC		 3052 handle = ext4_journal_start(inode,
3053 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 3054 if (IS_ERR(handle))
3055 return PTR_ERR(handle);
3056 ret = dquot_commit(dquot);
617ba13b 3057 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3058 if (!ret)
3059 ret = err;
3060 return ret;
3061}
3062
617ba13b 3063static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 3064{
3065 int ret, err;
3066 handle_t *handle;
3067
617ba13b
MC		 3068 handle = ext4_journal_start(dquot_to_inode(dquot),
3069 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 3070 if (IS_ERR(handle))
3071 return PTR_ERR(handle);
3072 ret = dquot_acquire(dquot);
617ba13b 3073 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3074 if (!ret)
3075 ret = err;
3076 return ret;
3077}
3078
617ba13b 3079static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 3080{
3081 int ret, err;
3082 handle_t *handle;
3083
617ba13b
MC		 3084 handle = ext4_journal_start(dquot_to_inode(dquot),
3085 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 3086 if (IS_ERR(handle)) {
3087 /* Release dquot anyway to avoid endless cycle in dqput() */
3088 dquot_release(dquot);
ac27a0ec 3089 return PTR_ERR(handle);
9c3013e9 3090 }
ac27a0ec 3091 ret = dquot_release(dquot);
617ba13b 3092 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3093 if (!ret)
3094 ret = err;
3095 return ret;
3096}
3097
617ba13b 3098static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec
DK		 3099{
3100 /* Are we journalling quotas? */
617ba13b
MC		 3101 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
3102 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
ac27a0ec 3103 dquot_mark_dquot_dirty(dquot);
617ba13b 3104 return ext4_write_dquot(dquot);
ac27a0ec
DK		 3105 } else {
3106 return dquot_mark_dquot_dirty(dquot);
3107 }
3108}
3109
617ba13b 3110static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 3111{
3112 int ret, err;
3113 handle_t *handle;
3114
3115 /* Data block + inode block */
617ba13b 3116 handle = ext4_journal_start(sb->s_root->d_inode, 2);
ac27a0ec
DK		 3117 if (IS_ERR(handle))
3118 return PTR_ERR(handle);
3119 ret = dquot_commit_info(sb, type);
617ba13b 3120 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3121 if (!ret)
3122 ret = err;
3123 return ret;
3124}
3125
3126/*
3127 * Turn on quotas during mount time - we need to find
3128 * the quota file and such...
3129 */
617ba13b 3130static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 3131{
617ba13b
MC		 3132 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
3133 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 3134}
3135
3136/*
3137 * Standard function to be called on quota_on
3138 */
617ba13b 3139static int ext4_quota_on(struct super_block *sb, int type, int format_id,
ac27a0ec
DK		 3140 char *path)
3141{
3142 int err;
3143 struct nameidata nd;
3144
3145 if (!test_opt(sb, QUOTA))
3146 return -EINVAL;
3147 /* Not journalling quota? */
617ba13b
MC		 3148 if (!EXT4_SB(sb)->s_qf_names[USRQUOTA] &&
3149 !EXT4_SB(sb)->s_qf_names[GRPQUOTA])
ac27a0ec
DK		 3150 return vfs_quota_on(sb, type, format_id, path);
3151 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
3152 if (err)
3153 return err;
3154 /* Quotafile not on the same filesystem? */
3155 if (nd.mnt->mnt_sb != sb) {
3156 path_release(&nd);
3157 return -EXDEV;
3158 }
3159 /* Quotafile not of fs root? */
3160 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
3161 printk(KERN_WARNING
617ba13b 3162 "EXT4-fs: Quota file not on filesystem root. "
ac27a0ec
DK		 3163 "Journalled quota will not work.\n");
3164 path_release(&nd);
3165 return vfs_quota_on(sb, type, format_id, path);
3166}
3167
3168/* Read data from quotafile - avoid pagecache and such because we cannot afford
3169 * acquiring the locks... As quota files are never truncated and quota code
3170 * itself serializes the operations (and noone else should touch the files)
3171 * we don't have to be afraid of races */
617ba13b 3172static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 3173 size_t len, loff_t off)
3174{
3175 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 3176 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 3177 int err = 0;
3178 int offset = off & (sb->s_blocksize - 1);
3179 int tocopy;
3180 size_t toread;
3181 struct buffer_head *bh;
3182 loff_t i_size = i_size_read(inode);
3183
3184 if (off > i_size)
3185 return 0;
3186 if (off+len > i_size)
3187 len = i_size-off;
3188 toread = len;
3189 while (toread > 0) {
3190 tocopy = sb->s_blocksize - offset < toread ?
3191 sb->s_blocksize - offset : toread;
617ba13b 3192 bh = ext4_bread(NULL, inode, blk, 0, &err);
ac27a0ec
DK		 3193 if (err)
3194 return err;
3195 if (!bh) /* A hole? */
3196 memset(data, 0, tocopy);
3197 else
3198 memcpy(data, bh->b_data+offset, tocopy);
3199 brelse(bh);
3200 offset = 0;
3201 toread -= tocopy;
3202 data += tocopy;
3203 blk++;
3204 }
3205 return len;
3206}
3207
3208/* Write to quotafile (we know the transaction is already started and has
3209 * enough credits) */
617ba13b 3210static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 3211 const char *data, size_t len, loff_t off)
3212{
3213 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 3214 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 3215 int err = 0;
3216 int offset = off & (sb->s_blocksize - 1);
3217 int tocopy;
617ba13b 3218 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
ac27a0ec
DK		 3219 size_t towrite = len;
3220 struct buffer_head *bh;
3221 handle_t *handle = journal_current_handle();
3222
9c3013e9
JK		 3223 if (!handle) {
3224 printk(KERN_WARNING "EXT4-fs: Quota write (off=%Lu, len=%Lu)"
3225 " cancelled because transaction is not started.\n",
3226 (unsigned long long)off, (unsigned long long)len);
3227 return -EIO;
3228 }
ac27a0ec
DK		 3229 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
3230 while (towrite > 0) {
3231 tocopy = sb->s_blocksize - offset < towrite ?
3232 sb->s_blocksize - offset : towrite;
617ba13b 3233 bh = ext4_bread(handle, inode, blk, 1, &err);
ac27a0ec
DK		 3234 if (!bh)
3235 goto out;
3236 if (journal_quota) {
617ba13b 3237 err = ext4_journal_get_write_access(handle, bh);
ac27a0ec
DK		 3238 if (err) {
3239 brelse(bh);
3240 goto out;
3241 }
3242 }
3243 lock_buffer(bh);
3244 memcpy(bh->b_data+offset, data, tocopy);
3245 flush_dcache_page(bh->b_page);
3246 unlock_buffer(bh);
3247 if (journal_quota)
617ba13b 3248 err = ext4_journal_dirty_metadata(handle, bh);
ac27a0ec
DK		 3249 else {
3250 /* Always do at least ordered writes for quotas */
617ba13b 3251 err = ext4_journal_dirty_data(handle, bh);
ac27a0ec
DK		 3252 mark_buffer_dirty(bh);
3253 }
3254 brelse(bh);
3255 if (err)
3256 goto out;
3257 offset = 0;
3258 towrite -= tocopy;
3259 data += tocopy;
3260 blk++;
3261 }
3262out:
3263 if (len == towrite)
3264 return err;
3265 if (inode->i_size < off+len-towrite) {
3266 i_size_write(inode, off+len-towrite);
617ba13b 3267 EXT4_I(inode)->i_disksize = inode->i_size;
ac27a0ec 3268 }
ac27a0ec 3269 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
617ba13b 3270 ext4_mark_inode_dirty(handle, inode);
ac27a0ec
DK		 3271 mutex_unlock(&inode->i_mutex);
3272 return len - towrite;
3273}
3274
3275#endif
3276
617ba13b 3277static int ext4_get_sb(struct file_system_type *fs_type,
ac27a0ec
DK		 3278 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3279{
617ba13b 3280 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
ac27a0ec
DK		 3281}
3282
617ba13b 3283static struct file_system_type ext4dev_fs_type = {
ac27a0ec 3284 .owner = THIS_MODULE,
617ba13b
MC		 3285 .name = "ext4dev",
3286 .get_sb = ext4_get_sb,
ac27a0ec
DK		 3287 .kill_sb = kill_block_super,
3288 .fs_flags = FS_REQUIRES_DEV,
3289};
3290
617ba13b 3291static int __init init_ext4_fs(void)
ac27a0ec 3292{
c9de560d
AT		 3293 int err;
3294
3295 err = init_ext4_mballoc();
ac27a0ec
DK		 3296 if (err)
3297 return err;
c9de560d
AT		 3298
3299 err = init_ext4_xattr();
3300 if (err)
3301 goto out2;
ac27a0ec
DK		 3302 err = init_inodecache();
3303 if (err)
3304 goto out1;
63f57933 3305 err = register_filesystem(&ext4dev_fs_type);
ac27a0ec
DK		 3306 if (err)
3307 goto out;
3308 return 0;
3309out:
3310 destroy_inodecache();
3311out1:
617ba13b 3312 exit_ext4_xattr();
c9de560d
AT		 3313out2:
3314 exit_ext4_mballoc();
ac27a0ec
DK		 3315 return err;
3316}
3317
617ba13b 3318static void __exit exit_ext4_fs(void)
ac27a0ec 3319{
617ba13b 3320 unregister_filesystem(&ext4dev_fs_type);
ac27a0ec 3321 destroy_inodecache();
617ba13b 3322 exit_ext4_xattr();
c9de560d 3323 exit_ext4_mballoc();
ac27a0ec
DK		 3324}
3325
3326MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
617ba13b 3327MODULE_DESCRIPTION("Fourth Extended Filesystem with extents");
ac27a0ec 3328MODULE_LICENSE("GPL");
617ba13b
MC		 3329module_init(init_ext4_fs)
3330module_exit(exit_ext4_fs)
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