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CommitLineData
1da177e4
LT		 1/*
2 * linux/fs/ext2/super.c
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
1da177e4
LT		 19#include <linux/module.h>
20#include <linux/string.h>
8fc2751b 21#include <linux/fs.h>
1da177e4
LT		 22#include <linux/slab.h>
23#include <linux/init.h>
24#include <linux/blkdev.h>
25#include <linux/parser.h>
26#include <linux/random.h>
27#include <linux/buffer_head.h>
a5694255 28#include <linux/exportfs.h>
1da177e4
LT		 29#include <linux/smp_lock.h>
30#include <linux/vfs.h>
8fc2751b
MB		 31#include <linux/seq_file.h>
32#include <linux/mount.h>
d8ea6cf8 33#include <linux/log2.h>
74abb989 34#include <linux/quotaops.h>
1da177e4
LT		 35#include <asm/uaccess.h>
36#include "ext2.h"
37#include "xattr.h"
38#include "acl.h"
6d79125b 39#include "xip.h"
1da177e4
LT		 40
41static void ext2_sync_super(struct super_block *sb,
42 struct ext2_super_block *es);
43static int ext2_remount (struct super_block * sb, int * flags, char * data);
726c3342 44static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf);
1da177e4
LT		 45
46void ext2_error (struct super_block * sb, const char * function,
47 const char * fmt, ...)
48{
49 va_list args;
50 struct ext2_sb_info *sbi = EXT2_SB(sb);
51 struct ext2_super_block *es = sbi->s_es;
52
53 if (!(sb->s_flags & MS_RDONLY)) {
54 sbi->s_mount_state |= EXT2_ERROR_FS;
31f68e13 55 es->s_state |= cpu_to_le16(EXT2_ERROR_FS);
1da177e4
LT		 56 ext2_sync_super(sb, es);
57 }
58
59 va_start(args, fmt);
60 printk(KERN_CRIT "EXT2-fs error (device %s): %s: ",sb->s_id, function);
61 vprintk(fmt, args);
62 printk("\n");
63 va_end(args);
64
65 if (test_opt(sb, ERRORS_PANIC))
66 panic("EXT2-fs panic from previous error\n");
67 if (test_opt(sb, ERRORS_RO)) {
68 printk("Remounting filesystem read-only\n");
69 sb->s_flags |= MS_RDONLY;
70 }
71}
72
73void ext2_warning (struct super_block * sb, const char * function,
74 const char * fmt, ...)
75{
76 va_list args;
77
78 va_start(args, fmt);
79 printk(KERN_WARNING "EXT2-fs warning (device %s): %s: ",
80 sb->s_id, function);
81 vprintk(fmt, args);
82 printk("\n");
83 va_end(args);
84}
85
86void ext2_update_dynamic_rev(struct super_block *sb)
87{
88 struct ext2_super_block *es = EXT2_SB(sb)->s_es;
89
90 if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV)
91 return;
92
605afd60 93 ext2_warning(sb, __func__,
1da177e4
LT		 94 "updating to rev %d because of new feature flag, "
95 "running e2fsck is recommended",
96 EXT2_DYNAMIC_REV);
97
98 es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO);
99 es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE);
100 es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV);
101 /* leave es->s_feature_*compat flags alone */
102 /* es->s_uuid will be set by e2fsck if empty */
103
104 /*
105 * The rest of the superblock fields should be zero, and if not it
106 * means they are likely already in use, so leave them alone. We
107 * can leave it up to e2fsck to clean up any inconsistencies there.
108 */
109}
110
111static void ext2_put_super (struct super_block * sb)
112{
113 int db_count;
114 int i;
115 struct ext2_sb_info *sbi = EXT2_SB(sb);
116
6cfd0148
CH		 117 lock_kernel();
118
8c85e125
CH		 119 if (sb->s_dirt)
120 ext2_write_super(sb);
121
1da177e4
LT		 122 ext2_xattr_put_super(sb);
123 if (!(sb->s_flags & MS_RDONLY)) {
124 struct ext2_super_block *es = sbi->s_es;
125
126 es->s_state = cpu_to_le16(sbi->s_mount_state);
127 ext2_sync_super(sb, es);
128 }
129 db_count = sbi->s_gdb_count;
130 for (i = 0; i < db_count; i++)
131 if (sbi->s_group_desc[i])
132 brelse (sbi->s_group_desc[i]);
133 kfree(sbi->s_group_desc);
134 kfree(sbi->s_debts);
135 percpu_counter_destroy(&sbi->s_freeblocks_counter);
136 percpu_counter_destroy(&sbi->s_freeinodes_counter);
137 percpu_counter_destroy(&sbi->s_dirs_counter);
138 brelse (sbi->s_sbh);
139 sb->s_fs_info = NULL;
18a82eb9 140 kfree(sbi->s_blockgroup_lock);
1da177e4
LT		 141 kfree(sbi);
142
6cfd0148 143 unlock_kernel();
1da177e4
LT		 144}
145
e18b890b 146static struct kmem_cache * ext2_inode_cachep;
1da177e4
LT		 147
148static struct inode *ext2_alloc_inode(struct super_block *sb)
149{
150 struct ext2_inode_info *ei;
e94b1766 151 ei = (struct ext2_inode_info *)kmem_cache_alloc(ext2_inode_cachep, GFP_KERNEL);
1da177e4
LT		 152 if (!ei)
153 return NULL;
154#ifdef CONFIG_EXT2_FS_POSIX_ACL
155 ei->i_acl = EXT2_ACL_NOT_CACHED;
156 ei->i_default_acl = EXT2_ACL_NOT_CACHED;
157#endif
a686cd89 158 ei->i_block_alloc_info = NULL;
1da177e4
LT		 159 ei->vfs_inode.i_version = 1;
160 return &ei->vfs_inode;
161}
162
163static void ext2_destroy_inode(struct inode *inode)
164{
165 kmem_cache_free(ext2_inode_cachep, EXT2_I(inode));
166}
167
51cc5068 168static void init_once(void *foo)
1da177e4
LT		 169{
170 struct ext2_inode_info *ei = (struct ext2_inode_info *) foo;
171
a35afb83 172 rwlock_init(&ei->i_meta_lock);
1da177e4 173#ifdef CONFIG_EXT2_FS_XATTR
a35afb83 174 init_rwsem(&ei->xattr_sem);
1da177e4 175#endif
a686cd89 176 mutex_init(&ei->truncate_mutex);
a35afb83 177 inode_init_once(&ei->vfs_inode);
1da177e4 178}
20c2df83 179
1da177e4
LT		 180static int init_inodecache(void)
181{
182 ext2_inode_cachep = kmem_cache_create("ext2_inode_cache",
183 sizeof(struct ext2_inode_info),
fffb60f9
PJ		 184 0, (SLAB_RECLAIM_ACCOUNT|
185 SLAB_MEM_SPREAD),
20c2df83 186 init_once);
1da177e4
LT		 187 if (ext2_inode_cachep == NULL)
188 return -ENOMEM;
189 return 0;
190}
191
192static void destroy_inodecache(void)
193{
1a1d92c1 194 kmem_cache_destroy(ext2_inode_cachep);
1da177e4
LT		 195}
196
197static void ext2_clear_inode(struct inode *inode)
198{
a686cd89 199 struct ext2_block_alloc_info *rsv = EXT2_I(inode)->i_block_alloc_info;
1da177e4
LT		 200#ifdef CONFIG_EXT2_FS_POSIX_ACL
201 struct ext2_inode_info *ei = EXT2_I(inode);
202
203 if (ei->i_acl && ei->i_acl != EXT2_ACL_NOT_CACHED) {
204 posix_acl_release(ei->i_acl);
205 ei->i_acl = EXT2_ACL_NOT_CACHED;
206 }
207 if (ei->i_default_acl && ei->i_default_acl != EXT2_ACL_NOT_CACHED) {
208 posix_acl_release(ei->i_default_acl);
209 ei->i_default_acl = EXT2_ACL_NOT_CACHED;
210 }
211#endif
a686cd89
MB		 212 ext2_discard_reservation(inode);
213 EXT2_I(inode)->i_block_alloc_info = NULL;
214 if (unlikely(rsv))
215 kfree(rsv);
1da177e4
LT		 216}
217
8fc2751b
MB		 218static int ext2_show_options(struct seq_file *seq, struct vfsmount *vfs)
219{
93d44cb2
MS		 220 struct super_block *sb = vfs->mnt_sb;
221 struct ext2_sb_info *sbi = EXT2_SB(sb);
222 struct ext2_super_block *es = sbi->s_es;
223 unsigned long def_mount_opts;
8fc2751b 224
93d44cb2
MS		 225 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
226
227 if (sbi->s_sb_block != 1)
228 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
229 if (test_opt(sb, MINIX_DF))
230 seq_puts(seq, ",minixdf");
231 if (test_opt(sb, GRPID))
8fc2751b 232 seq_puts(seq, ",grpid");
93d44cb2
MS		 233 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS))
234 seq_puts(seq, ",nogrpid");
235 if (sbi->s_resuid != EXT2_DEF_RESUID ||
236 le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) {
237 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
238 }
239 if (sbi->s_resgid != EXT2_DEF_RESGID ||
240 le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) {
241 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
242 }
14e11e10 243 if (test_opt(sb, ERRORS_RO)) {
93d44cb2
MS		 244 int def_errors = le16_to_cpu(es->s_errors);
245
246 if (def_errors == EXT2_ERRORS_PANIC ||
14e11e10
AK		 247 def_errors == EXT2_ERRORS_CONTINUE) {
248 seq_puts(seq, ",errors=remount-ro");
93d44cb2
MS		 249 }
250 }
14e11e10
AK		 251 if (test_opt(sb, ERRORS_CONT))
252 seq_puts(seq, ",errors=continue");
93d44cb2
MS		 253 if (test_opt(sb, ERRORS_PANIC))
254 seq_puts(seq, ",errors=panic");
255 if (test_opt(sb, NO_UID32))
256 seq_puts(seq, ",nouid32");
257 if (test_opt(sb, DEBUG))
258 seq_puts(seq, ",debug");
259 if (test_opt(sb, OLDALLOC))
260 seq_puts(seq, ",oldalloc");
261
262#ifdef CONFIG_EXT2_FS_XATTR
263 if (test_opt(sb, XATTR_USER))
264 seq_puts(seq, ",user_xattr");
265 if (!test_opt(sb, XATTR_USER) &&
266 (def_mount_opts & EXT2_DEFM_XATTR_USER)) {
267 seq_puts(seq, ",nouser_xattr");
268 }
269#endif
270
271#ifdef CONFIG_EXT2_FS_POSIX_ACL
272 if (test_opt(sb, POSIX_ACL))
273 seq_puts(seq, ",acl");
274 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL))
275 seq_puts(seq, ",noacl");
276#endif
277
278 if (test_opt(sb, NOBH))
279 seq_puts(seq, ",nobh");
8fc2751b
MB		 280
281#if defined(CONFIG_QUOTA)
282 if (sbi->s_mount_opt & EXT2_MOUNT_USRQUOTA)
283 seq_puts(seq, ",usrquota");
284
285 if (sbi->s_mount_opt & EXT2_MOUNT_GRPQUOTA)
286 seq_puts(seq, ",grpquota");
287#endif
288
83541796
CO		 289#if defined(CONFIG_EXT2_FS_XIP)
290 if (sbi->s_mount_opt & EXT2_MOUNT_XIP)
291 seq_puts(seq, ",xip");
292#endif
293
35c879dc
MS		 294 if (!test_opt(sb, RESERVATION))
295 seq_puts(seq, ",noreservation");
296
8fc2751b
MB		 297 return 0;
298}
299
1da177e4
LT		 300#ifdef CONFIG_QUOTA
301static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off);
302static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off);
303#endif
304
ee9b6d61 305static const struct super_operations ext2_sops = {
1da177e4
LT		 306 .alloc_inode = ext2_alloc_inode,
307 .destroy_inode = ext2_destroy_inode,
1da177e4
LT		 308 .write_inode = ext2_write_inode,
309 .delete_inode = ext2_delete_inode,
310 .put_super = ext2_put_super,
311 .write_super = ext2_write_super,
312 .statfs = ext2_statfs,
313 .remount_fs = ext2_remount,
314 .clear_inode = ext2_clear_inode,
8fc2751b 315 .show_options = ext2_show_options,
1da177e4
LT		 316#ifdef CONFIG_QUOTA
317 .quota_read = ext2_quota_read,
318 .quota_write = ext2_quota_write,
319#endif
320};
321
2e4c68e3
CH		 322static struct inode *ext2_nfs_get_inode(struct super_block *sb,
323 u64 ino, u32 generation)
ecaff756 324{
ecaff756 325 struct inode *inode;
ecaff756
N		 326
327 if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO)
328 return ERR_PTR(-ESTALE);
329 if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count))
330 return ERR_PTR(-ESTALE);
331
332 /* iget isn't really right if the inode is currently unallocated!!
333 * ext2_read_inode currently does appropriate checks, but
334 * it might be "neater" to call ext2_get_inode first and check
335 * if the inode is valid.....
336 */
52fcf703
DH		 337 inode = ext2_iget(sb, ino);
338 if (IS_ERR(inode))
339 return ERR_CAST(inode);
340 if (generation && inode->i_generation != generation) {
ecaff756
N		 341 /* we didn't find the right inode.. */
342 iput(inode);
343 return ERR_PTR(-ESTALE);
344 }
2e4c68e3
CH		 345 return inode;
346}
347
348static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid,
349 int fh_len, int fh_type)
350{
351 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
352 ext2_nfs_get_inode);
353}
354
355static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid,
356 int fh_len, int fh_type)
357{
358 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
359 ext2_nfs_get_inode);
ecaff756
N		 360}
361
1da177e4
LT		 362/* Yes, most of these are left as NULL!!
363 * A NULL value implies the default, which works with ext2-like file
364 * systems, but can be improved upon.
365 * Currently only get_parent is required.
366 */
39655164 367static const struct export_operations ext2_export_ops = {
2e4c68e3
CH		 368 .fh_to_dentry = ext2_fh_to_dentry,
369 .fh_to_parent = ext2_fh_to_parent,
1da177e4
LT		 370 .get_parent = ext2_get_parent,
371};
372
373static unsigned long get_sb_block(void **data)
374{
375 unsigned long sb_block;
376 char *options = (char *) *data;
377
378 if (!options || strncmp(options, "sb=", 3) != 0)
379 return 1; /* Default location */
380 options += 3;
381 sb_block = simple_strtoul(options, &options, 0);
382 if (*options && *options != ',') {
383 printk("EXT2-fs: Invalid sb specification: %s\n",
384 (char *) *data);
385 return 1;
386 }
387 if (*options == ',')
388 options++;
389 *data = (void *) options;
390 return sb_block;
391}
392
393enum {
394 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
8fc2751b 395 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic,
2860b733 396 Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug,
8fc2751b
MB		 397 Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr,
398 Opt_acl, Opt_noacl, Opt_xip, Opt_ignore, Opt_err, Opt_quota,
a686cd89 399 Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation
1da177e4
LT		 400};
401
a447c093 402static const match_table_t tokens = {
1da177e4
LT		 403 {Opt_bsd_df, "bsddf"},
404 {Opt_minix_df, "minixdf"},
405 {Opt_grpid, "grpid"},
406 {Opt_grpid, "bsdgroups"},
407 {Opt_nogrpid, "nogrpid"},
408 {Opt_nogrpid, "sysvgroups"},
409 {Opt_resgid, "resgid=%u"},
410 {Opt_resuid, "resuid=%u"},
411 {Opt_sb, "sb=%u"},
412 {Opt_err_cont, "errors=continue"},
413 {Opt_err_panic, "errors=panic"},
414 {Opt_err_ro, "errors=remount-ro"},
415 {Opt_nouid32, "nouid32"},
416 {Opt_nocheck, "check=none"},
417 {Opt_nocheck, "nocheck"},
1da177e4
LT		 418 {Opt_debug, "debug"},
419 {Opt_oldalloc, "oldalloc"},
420 {Opt_orlov, "orlov"},
421 {Opt_nobh, "nobh"},
422 {Opt_user_xattr, "user_xattr"},
423 {Opt_nouser_xattr, "nouser_xattr"},
424 {Opt_acl, "acl"},
425 {Opt_noacl, "noacl"},
6d79125b 426 {Opt_xip, "xip"},
8fc2751b 427 {Opt_grpquota, "grpquota"},
1da177e4 428 {Opt_ignore, "noquota"},
8fc2751b
MB		 429 {Opt_quota, "quota"},
430 {Opt_usrquota, "usrquota"},
a686cd89
MB		 431 {Opt_reservation, "reservation"},
432 {Opt_noreservation, "noreservation"},
1da177e4
LT		 433 {Opt_err, NULL}
434};
435
436static int parse_options (char * options,
437 struct ext2_sb_info *sbi)
438{
439 char * p;
440 substring_t args[MAX_OPT_ARGS];
1da177e4
LT		 441 int option;
442
443 if (!options)
444 return 1;
445
446 while ((p = strsep (&options, ",")) != NULL) {
447 int token;
448 if (!*p)
449 continue;
450
451 token = match_token(p, tokens, args);
452 switch (token) {
453 case Opt_bsd_df:
454 clear_opt (sbi->s_mount_opt, MINIX_DF);
455 break;
456 case Opt_minix_df:
457 set_opt (sbi->s_mount_opt, MINIX_DF);
458 break;
459 case Opt_grpid:
460 set_opt (sbi->s_mount_opt, GRPID);
461 break;
462 case Opt_nogrpid:
463 clear_opt (sbi->s_mount_opt, GRPID);
464 break;
465 case Opt_resuid:
466 if (match_int(&args[0], &option))
467 return 0;
468 sbi->s_resuid = option;
469 break;
470 case Opt_resgid:
471 if (match_int(&args[0], &option))
472 return 0;
473 sbi->s_resgid = option;
474 break;
475 case Opt_sb:
476 /* handled by get_sb_block() instead of here */
477 /* *sb_block = match_int(&args[0]); */
478 break;
479 case Opt_err_panic:
5a2b4062
VA		 480 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
481 clear_opt (sbi->s_mount_opt, ERRORS_RO);
482 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
1da177e4
LT		 483 break;
484 case Opt_err_ro:
5a2b4062
VA		 485 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
486 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
487 set_opt (sbi->s_mount_opt, ERRORS_RO);
1da177e4
LT		 488 break;
489 case Opt_err_cont:
5a2b4062
VA		 490 clear_opt (sbi->s_mount_opt, ERRORS_RO);
491 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
492 set_opt (sbi->s_mount_opt, ERRORS_CONT);
1da177e4
LT		 493 break;
494 case Opt_nouid32:
495 set_opt (sbi->s_mount_opt, NO_UID32);
496 break;
1da177e4
LT		 497 case Opt_nocheck:
498 clear_opt (sbi->s_mount_opt, CHECK);
499 break;
500 case Opt_debug:
501 set_opt (sbi->s_mount_opt, DEBUG);
502 break;
503 case Opt_oldalloc:
504 set_opt (sbi->s_mount_opt, OLDALLOC);
505 break;
506 case Opt_orlov:
507 clear_opt (sbi->s_mount_opt, OLDALLOC);
508 break;
509 case Opt_nobh:
510 set_opt (sbi->s_mount_opt, NOBH);
511 break;
512#ifdef CONFIG_EXT2_FS_XATTR
513 case Opt_user_xattr:
514 set_opt (sbi->s_mount_opt, XATTR_USER);
515 break;
516 case Opt_nouser_xattr:
517 clear_opt (sbi->s_mount_opt, XATTR_USER);
518 break;
519#else
520 case Opt_user_xattr:
521 case Opt_nouser_xattr:
522 printk("EXT2 (no)user_xattr options not supported\n");
523 break;
524#endif
525#ifdef CONFIG_EXT2_FS_POSIX_ACL
526 case Opt_acl:
527 set_opt(sbi->s_mount_opt, POSIX_ACL);
528 break;
529 case Opt_noacl:
530 clear_opt(sbi->s_mount_opt, POSIX_ACL);
531 break;
532#else
533 case Opt_acl:
534 case Opt_noacl:
535 printk("EXT2 (no)acl options not supported\n");
536 break;
537#endif
6d79125b
CO		 538 case Opt_xip:
539#ifdef CONFIG_EXT2_FS_XIP
540 set_opt (sbi->s_mount_opt, XIP);
541#else
542 printk("EXT2 xip option not supported\n");
543#endif
544 break;
8fc2751b
MB		 545
546#if defined(CONFIG_QUOTA)
547 case Opt_quota:
548 case Opt_usrquota:
549 set_opt(sbi->s_mount_opt, USRQUOTA);
550 break;
551
552 case Opt_grpquota:
553 set_opt(sbi->s_mount_opt, GRPQUOTA);
554 break;
555#else
556 case Opt_quota:
557 case Opt_usrquota:
558 case Opt_grpquota:
559 printk(KERN_ERR
560 "EXT2-fs: quota operations not supported.\n");
561
562 break;
563#endif
564
a686cd89
MB		 565 case Opt_reservation:
566 set_opt(sbi->s_mount_opt, RESERVATION);
567 printk("reservations ON\n");
568 break;
569 case Opt_noreservation:
570 clear_opt(sbi->s_mount_opt, RESERVATION);
571 printk("reservations OFF\n");
572 break;
1da177e4
LT		 573 case Opt_ignore:
574 break;
575 default:
576 return 0;
577 }
578 }
1da177e4
LT		 579 return 1;
580}
581
582static int ext2_setup_super (struct super_block * sb,
583 struct ext2_super_block * es,
584 int read_only)
585{
586 int res = 0;
587 struct ext2_sb_info *sbi = EXT2_SB(sb);
588
589 if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) {
590 printk ("EXT2-fs warning: revision level too high, "
591 "forcing read-only mode\n");
592 res = MS_RDONLY;
593 }
594 if (read_only)
595 return res;
596 if (!(sbi->s_mount_state & EXT2_VALID_FS))
597 printk ("EXT2-fs warning: mounting unchecked fs, "
598 "running e2fsck is recommended\n");
599 else if ((sbi->s_mount_state & EXT2_ERROR_FS))
600 printk ("EXT2-fs warning: mounting fs with errors, "
601 "running e2fsck is recommended\n");
602 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
603 le16_to_cpu(es->s_mnt_count) >=
604 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
605 printk ("EXT2-fs warning: maximal mount count reached, "
606 "running e2fsck is recommended\n");
607 else if (le32_to_cpu(es->s_checkinterval) &&
608 (le32_to_cpu(es->s_lastcheck) + le32_to_cpu(es->s_checkinterval) <= get_seconds()))
609 printk ("EXT2-fs warning: checktime reached, "
610 "running e2fsck is recommended\n");
611 if (!le16_to_cpu(es->s_max_mnt_count))
612 es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT);
fba4d399 613 le16_add_cpu(&es->s_mnt_count, 1);
1da177e4
LT		 614 ext2_write_super(sb);
615 if (test_opt (sb, DEBUG))
616 printk ("[EXT II FS %s, %s, bs=%lu, fs=%lu, gc=%lu, "
617 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
618 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize,
619 sbi->s_frag_size,
620 sbi->s_groups_count,
621 EXT2_BLOCKS_PER_GROUP(sb),
622 EXT2_INODES_PER_GROUP(sb),
623 sbi->s_mount_opt);
1da177e4
LT		 624 return res;
625}
626
197cd65a 627static int ext2_check_descriptors(struct super_block *sb)
1da177e4
LT		 628{
629 int i;
1da177e4 630 struct ext2_sb_info *sbi = EXT2_SB(sb);
1da177e4
LT		 631
632 ext2_debug ("Checking group descriptors");
633
197cd65a
AM		 634 for (i = 0; i < sbi->s_groups_count; i++) {
635 struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL);
24097d12
AM		 636 ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i);
637 ext2_fsblk_t last_block;
197cd65a 638
41f04d85
ES		 639 if (i == sbi->s_groups_count - 1)
640 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
641 else
642 last_block = first_block +
643 (EXT2_BLOCKS_PER_GROUP(sb) - 1);
644
41f04d85
ES		 645 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
646 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1da177e4
LT		 647 {
648 ext2_error (sb, "ext2_check_descriptors",
649 "Block bitmap for group %d"
650 " not in group (block %lu)!",
651 i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap));
652 return 0;
653 }
41f04d85
ES		 654 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
655 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1da177e4
LT		 656 {
657 ext2_error (sb, "ext2_check_descriptors",
658 "Inode bitmap for group %d"
659 " not in group (block %lu)!",
660 i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap));
661 return 0;
662 }
41f04d85 663 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
780dcdb2 664 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
41f04d85 665 last_block)
1da177e4
LT		 666 {
667 ext2_error (sb, "ext2_check_descriptors",
668 "Inode table for group %d"
669 " not in group (block %lu)!",
670 i, (unsigned long) le32_to_cpu(gdp->bg_inode_table));
671 return 0;
672 }
1da177e4
LT		 673 }
674 return 1;
675}
676
1da177e4
LT		 677/*
678 * Maximal file size. There is a direct, and {,double-,triple-}indirect
679 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
680 * We need to be 1 filesystem block less than the 2^32 sector limit.
681 */
682static loff_t ext2_max_size(int bits)
683{
684 loff_t res = EXT2_NDIR_BLOCKS;
902be4c5
AK		 685 int meta_blocks;
686 loff_t upper_limit;
687
688 /* This is calculated to be the largest file size for a
689 * dense, file such that the total number of
1da177e4 690 * sectors in the file, including data and all indirect blocks,
902be4c5
AK		 691 * does not exceed 2^32 -1
692 * __u32 i_blocks representing the total number of
693 * 512 bytes blocks of the file
694 */
695 upper_limit = (1LL << 32) - 1;
696
697 /* total blocks in file system block size */
698 upper_limit >>= (bits - 9);
699
700
701 /* indirect blocks */
702 meta_blocks = 1;
703 /* double indirect blocks */
704 meta_blocks += 1 + (1LL << (bits-2));
705 /* tripple indirect blocks */
706 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
707
708 upper_limit -= meta_blocks;
709 upper_limit <<= bits;
1da177e4
LT		 710
711 res += 1LL << (bits-2);
712 res += 1LL << (2*(bits-2));
713 res += 1LL << (3*(bits-2));
714 res <<= bits;
715 if (res > upper_limit)
716 res = upper_limit;
902be4c5
AK		 717
718 if (res > MAX_LFS_FILESIZE)
719 res = MAX_LFS_FILESIZE;
720
1da177e4
LT		 721 return res;
722}
723
724static unsigned long descriptor_loc(struct super_block *sb,
725 unsigned long logic_sb_block,
726 int nr)
727{
728 struct ext2_sb_info *sbi = EXT2_SB(sb);
24097d12 729 unsigned long bg, first_meta_bg;
1da177e4
LT		 730 int has_super = 0;
731
1da177e4
LT		 732 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
733
734 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) ||
735 nr < first_meta_bg)
736 return (logic_sb_block + nr + 1);
737 bg = sbi->s_desc_per_block * nr;
738 if (ext2_bg_has_super(sb, bg))
739 has_super = 1;
24097d12
AM		 740
741 return ext2_group_first_block_no(sb, bg) + has_super;
1da177e4
LT		 742}
743
744static int ext2_fill_super(struct super_block *sb, void *data, int silent)
745{
746 struct buffer_head * bh;
747 struct ext2_sb_info * sbi;
748 struct ext2_super_block * es;
749 struct inode *root;
750 unsigned long block;
751 unsigned long sb_block = get_sb_block(&data);
752 unsigned long logic_sb_block;
753 unsigned long offset = 0;
754 unsigned long def_mount_opts;
52fcf703 755 long ret = -EINVAL;
1da177e4
LT		 756 int blocksize = BLOCK_SIZE;
757 int db_count;
758 int i, j;
759 __le32 features;
833f4077 760 int err;
1da177e4 761
f8314dc6 762 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1da177e4
LT		 763 if (!sbi)
764 return -ENOMEM;
18a82eb9
PE		 765
766 sbi->s_blockgroup_lock =
767 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
768 if (!sbi->s_blockgroup_lock) {
769 kfree(sbi);
770 return -ENOMEM;
771 }
1da177e4 772 sb->s_fs_info = sbi;
93d44cb2 773 sbi->s_sb_block = sb_block;
1da177e4
LT		 774
775 /*
776 * See what the current blocksize for the device is, and
777 * use that as the blocksize. Otherwise (or if the blocksize
778 * is smaller than the default) use the default.
779 * This is important for devices that have a hardware
780 * sectorsize that is larger than the default.
781 */
782 blocksize = sb_min_blocksize(sb, BLOCK_SIZE);
783 if (!blocksize) {
784 printk ("EXT2-fs: unable to set blocksize\n");
785 goto failed_sbi;
786 }
787
788 /*
789 * If the superblock doesn't start on a hardware sector boundary,
790 * calculate the offset.
791 */
792 if (blocksize != BLOCK_SIZE) {
793 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
794 offset = (sb_block*BLOCK_SIZE) % blocksize;
795 } else {
796 logic_sb_block = sb_block;
797 }
798
799 if (!(bh = sb_bread(sb, logic_sb_block))) {
800 printk ("EXT2-fs: unable to read superblock\n");
801 goto failed_sbi;
802 }
803 /*
804 * Note: s_es must be initialized as soon as possible because
805 * some ext2 macro-instructions depend on its value
806 */
807 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
808 sbi->s_es = es;
809 sb->s_magic = le16_to_cpu(es->s_magic);
810
811 if (sb->s_magic != EXT2_SUPER_MAGIC)
812 goto cantfind_ext2;
813
814 /* Set defaults before we parse the mount options */
815 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
816 if (def_mount_opts & EXT2_DEFM_DEBUG)
817 set_opt(sbi->s_mount_opt, DEBUG);
818 if (def_mount_opts & EXT2_DEFM_BSDGROUPS)
819 set_opt(sbi->s_mount_opt, GRPID);
820 if (def_mount_opts & EXT2_DEFM_UID16)
821 set_opt(sbi->s_mount_opt, NO_UID32);
2e7842b8 822#ifdef CONFIG_EXT2_FS_XATTR
1da177e4
LT		 823 if (def_mount_opts & EXT2_DEFM_XATTR_USER)
824 set_opt(sbi->s_mount_opt, XATTR_USER);
2e7842b8
HD		 825#endif
826#ifdef CONFIG_EXT2_FS_POSIX_ACL
1da177e4
LT		 827 if (def_mount_opts & EXT2_DEFM_ACL)
828 set_opt(sbi->s_mount_opt, POSIX_ACL);
2e7842b8 829#endif
1da177e4
LT		 830
831 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
832 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
14e11e10 833 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE)
5a2b4062 834 set_opt(sbi->s_mount_opt, ERRORS_CONT);
14e11e10
AK		 835 else
836 set_opt(sbi->s_mount_opt, ERRORS_RO);
1da177e4
LT		 837
838 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
839 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
840
a686cd89
MB		 841 set_opt(sbi->s_mount_opt, RESERVATION);
842
1da177e4
LT		 843 if (!parse_options ((char *) data, sbi))
844 goto failed_mount;
845
846 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
847 ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ?
848 MS_POSIXACL : 0);
849
6d79125b
CO		 850 ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset
851 EXT2_MOUNT_XIP if not */
852
1da177e4
LT		 853 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV &&
854 (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) ||
855 EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
856 EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U)))
857 printk("EXT2-fs warning: feature flags set on rev 0 fs, "
858 "running e2fsck is recommended\n");
859 /*
860 * Check feature flags regardless of the revision level, since we
861 * previously didn't change the revision level when setting the flags,
862 * so there is a chance incompat flags are set on a rev 0 filesystem.
863 */
864 features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP);
865 if (features) {
866 printk("EXT2-fs: %s: couldn't mount because of "
867 "unsupported optional features (%x).\n",
868 sb->s_id, le32_to_cpu(features));
869 goto failed_mount;
870 }
871 if (!(sb->s_flags & MS_RDONLY) &&
872 (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){
873 printk("EXT2-fs: %s: couldn't mount RDWR because of "
874 "unsupported optional features (%x).\n",
875 sb->s_id, le32_to_cpu(features));
876 goto failed_mount;
877 }
878
879 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
880
a8e3eff4 881 if (ext2_use_xip(sb) && blocksize != PAGE_SIZE) {
6d79125b
CO		 882 if (!silent)
883 printk("XIP: Unsupported blocksize\n");
884 goto failed_mount;
885 }
886
1da177e4
LT		 887 /* If the blocksize doesn't match, re-read the thing.. */
888 if (sb->s_blocksize != blocksize) {
889 brelse(bh);
890
891 if (!sb_set_blocksize(sb, blocksize)) {
892 printk(KERN_ERR "EXT2-fs: blocksize too small for device.\n");
893 goto failed_sbi;
894 }
895
896 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
897 offset = (sb_block*BLOCK_SIZE) % blocksize;
898 bh = sb_bread(sb, logic_sb_block);
899 if(!bh) {
900 printk("EXT2-fs: Couldn't read superblock on "
901 "2nd try.\n");
902 goto failed_sbi;
903 }
904 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
905 sbi->s_es = es;
906 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) {
907 printk ("EXT2-fs: Magic mismatch, very weird !\n");
908 goto failed_mount;
909 }
910 }
911
912 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits);
913
914 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) {
915 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
916 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
917 } else {
918 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
919 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
920 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) ||
d8ea6cf8 921 !is_power_of_2(sbi->s_inode_size) ||
1da177e4
LT		 922 (sbi->s_inode_size > blocksize)) {
923 printk ("EXT2-fs: unsupported inode size: %d\n",
924 sbi->s_inode_size);
925 goto failed_mount;
926 }
927 }
928
929 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE <<
930 le32_to_cpu(es->s_log_frag_size);
931 if (sbi->s_frag_size == 0)
932 goto cantfind_ext2;
933 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size;
934
935 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
936 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
937 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
938
939 if (EXT2_INODE_SIZE(sb) == 0)
940 goto cantfind_ext2;
941 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb);
607eb266 942 if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0)
1da177e4
LT		 943 goto cantfind_ext2;
944 sbi->s_itb_per_group = sbi->s_inodes_per_group /
945 sbi->s_inodes_per_block;
946 sbi->s_desc_per_block = sb->s_blocksize /
947 sizeof (struct ext2_group_desc);
948 sbi->s_sbh = bh;
949 sbi->s_mount_state = le16_to_cpu(es->s_state);
950 sbi->s_addr_per_block_bits =
f0d1b0b3 951 ilog2 (EXT2_ADDR_PER_BLOCK(sb));
1da177e4 952 sbi->s_desc_per_block_bits =
f0d1b0b3 953 ilog2 (EXT2_DESC_PER_BLOCK(sb));
1da177e4
LT		 954
955 if (sb->s_magic != EXT2_SUPER_MAGIC)
956 goto cantfind_ext2;
957
958 if (sb->s_blocksize != bh->b_size) {
959 if (!silent)
960 printk ("VFS: Unsupported blocksize on dev "
961 "%s.\n", sb->s_id);
962 goto failed_mount;
963 }
964
965 if (sb->s_blocksize != sbi->s_frag_size) {
966 printk ("EXT2-fs: fragsize %lu != blocksize %lu (not supported yet)\n",
967 sbi->s_frag_size, sb->s_blocksize);
968 goto failed_mount;
969 }
970
971 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) {
972 printk ("EXT2-fs: #blocks per group too big: %lu\n",
973 sbi->s_blocks_per_group);
974 goto failed_mount;
975 }
976 if (sbi->s_frags_per_group > sb->s_blocksize * 8) {
977 printk ("EXT2-fs: #fragments per group too big: %lu\n",
978 sbi->s_frags_per_group);
979 goto failed_mount;
980 }
981 if (sbi->s_inodes_per_group > sb->s_blocksize * 8) {
982 printk ("EXT2-fs: #inodes per group too big: %lu\n",
983 sbi->s_inodes_per_group);
984 goto failed_mount;
985 }
986
987 if (EXT2_BLOCKS_PER_GROUP(sb) == 0)
988 goto cantfind_ext2;
41f04d85
ES		 989 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
990 le32_to_cpu(es->s_first_data_block) - 1)
991 / EXT2_BLOCKS_PER_GROUP(sb)) + 1;
1da177e4
LT		 992 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
993 EXT2_DESC_PER_BLOCK(sb);
994 sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL);
995 if (sbi->s_group_desc == NULL) {
996 printk ("EXT2-fs: not enough memory\n");
997 goto failed_mount;
998 }
18a82eb9 999 bgl_lock_init(sbi->s_blockgroup_lock);
dd00cc48 1000 sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL);
1da177e4
LT		 1001 if (!sbi->s_debts) {
1002 printk ("EXT2-fs: not enough memory\n");
1003 goto failed_mount_group_desc;
1004 }
1da177e4
LT		 1005 for (i = 0; i < db_count; i++) {
1006 block = descriptor_loc(sb, logic_sb_block, i);
1007 sbi->s_group_desc[i] = sb_bread(sb, block);
1008 if (!sbi->s_group_desc[i]) {
1009 for (j = 0; j < i; j++)
1010 brelse (sbi->s_group_desc[j]);
1011 printk ("EXT2-fs: unable to read group descriptors\n");
1012 goto failed_mount_group_desc;
1013 }
1014 }
1015 if (!ext2_check_descriptors (sb)) {
1016 printk ("EXT2-fs: group descriptors corrupted!\n");
1da177e4
LT		 1017 goto failed_mount2;
1018 }
1019 sbi->s_gdb_count = db_count;
1020 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1021 spin_lock_init(&sbi->s_next_gen_lock);
0216bfcf 1022
a686cd89
MB		 1023 /* per fileystem reservation list head & lock */
1024 spin_lock_init(&sbi->s_rsv_window_lock);
1025 sbi->s_rsv_window_root = RB_ROOT;
1026 /*
1027 * Add a single, static dummy reservation to the start of the
1028 * reservation window list --- it gives us a placeholder for
1029 * append-at-start-of-list which makes the allocation logic
1030 * _much_ simpler.
1031 */
1032 sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
1033 sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
1034 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1035 sbi->s_rsv_window_head.rsv_goal_size = 0;
1036 ext2_rsv_window_add(sb, &sbi->s_rsv_window_head);
1037
833f4077 1038 err = percpu_counter_init(&sbi->s_freeblocks_counter,
0216bfcf 1039 ext2_count_free_blocks(sb));
833f4077
PZ		 1040 if (!err) {
1041 err = percpu_counter_init(&sbi->s_freeinodes_counter,
0216bfcf 1042 ext2_count_free_inodes(sb));
833f4077
PZ		 1043 }
1044 if (!err) {
1045 err = percpu_counter_init(&sbi->s_dirs_counter,
0216bfcf 1046 ext2_count_dirs(sb));
833f4077
PZ		 1047 }
1048 if (err) {
1049 printk(KERN_ERR "EXT2-fs: insufficient memory\n");
1050 goto failed_mount3;
1051 }
1da177e4
LT		 1052 /*
1053 * set up enough so that it can read an inode
1054 */
1055 sb->s_op = &ext2_sops;
1056 sb->s_export_op = &ext2_export_ops;
1057 sb->s_xattr = ext2_xattr_handlers;
52fcf703
DH		 1058 root = ext2_iget(sb, EXT2_ROOT_INO);
1059 if (IS_ERR(root)) {
1060 ret = PTR_ERR(root);
0216bfcf 1061 goto failed_mount3;
1da177e4
LT		 1062 }
1063 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
52fcf703 1064 iput(root);
1da177e4 1065 printk(KERN_ERR "EXT2-fs: corrupt root inode, run e2fsck\n");
0216bfcf 1066 goto failed_mount3;
1da177e4 1067 }
52fcf703
DH		 1068
1069 sb->s_root = d_alloc_root(root);
1070 if (!sb->s_root) {
1071 iput(root);
1072 printk(KERN_ERR "EXT2-fs: get root inode failed\n");
1073 ret = -ENOMEM;
1074 goto failed_mount3;
1075 }
1da177e4 1076 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL))
605afd60 1077 ext2_warning(sb, __func__,
ec63f22d 1078 "mounting ext3 filesystem as ext2");
1da177e4 1079 ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1da177e4
LT		 1080 return 0;
1081
1082cantfind_ext2:
1083 if (!silent)
1084 printk("VFS: Can't find an ext2 filesystem on dev %s.\n",
1085 sb->s_id);
1086 goto failed_mount;
0216bfcf
MC		 1087failed_mount3:
1088 percpu_counter_destroy(&sbi->s_freeblocks_counter);
1089 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1090 percpu_counter_destroy(&sbi->s_dirs_counter);
1da177e4
LT		 1091failed_mount2:
1092 for (i = 0; i < db_count; i++)
1093 brelse(sbi->s_group_desc[i]);
1094failed_mount_group_desc:
1095 kfree(sbi->s_group_desc);
1096 kfree(sbi->s_debts);
1097failed_mount:
1098 brelse(bh);
1099failed_sbi:
1100 sb->s_fs_info = NULL;
0f7ee7c1 1101 kfree(sbi->s_blockgroup_lock);
1da177e4 1102 kfree(sbi);
52fcf703 1103 return ret;
1da177e4
LT		 1104}
1105
1106static void ext2_commit_super (struct super_block * sb,
1107 struct ext2_super_block * es)
1108{
1109 es->s_wtime = cpu_to_le32(get_seconds());
1110 mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
1111 sb->s_dirt = 0;
1112}
1113
1114static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es)
1115{
1116 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb));
1117 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb));
1118 es->s_wtime = cpu_to_le32(get_seconds());
1119 mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
1120 sync_dirty_buffer(EXT2_SB(sb)->s_sbh);
1121 sb->s_dirt = 0;
1122}
1123
1124/*
1125 * In the second extended file system, it is not necessary to
1126 * write the super block since we use a mapping of the
1127 * disk super block in a buffer.
1128 *
1129 * However, this function is still used to set the fs valid
1130 * flags to 0. We need to set this flag to 0 since the fs
1131 * may have been checked while mounted and e2fsck may have
1132 * set s_state to EXT2_VALID_FS after some corrections.
1133 */
1134
1135void ext2_write_super (struct super_block * sb)
1136{
1137 struct ext2_super_block * es;
1138 lock_kernel();
1139 if (!(sb->s_flags & MS_RDONLY)) {
1140 es = EXT2_SB(sb)->s_es;
1141
31f68e13 1142 if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) {
1da177e4 1143 ext2_debug ("setting valid to 0\n");
31f68e13 1144 es->s_state &= cpu_to_le16(~EXT2_VALID_FS);
1da177e4
LT		 1145 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb));
1146 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb));
1147 es->s_mtime = cpu_to_le32(get_seconds());
1148 ext2_sync_super(sb, es);
1149 } else
1150 ext2_commit_super (sb, es);
1151 }
1152 sb->s_dirt = 0;
1153 unlock_kernel();
1154}
1155
1156static int ext2_remount (struct super_block * sb, int * flags, char * data)
1157{
1158 struct ext2_sb_info * sbi = EXT2_SB(sb);
1159 struct ext2_super_block * es;
6d79125b 1160 unsigned long old_mount_opt = sbi->s_mount_opt;
50a52234
JK		 1161 struct ext2_mount_options old_opts;
1162 unsigned long old_sb_flags;
1163 int err;
1164
337eb00a
AIB		 1165 lock_kernel();
1166
50a52234
JK		 1167 /* Store the old options */
1168 old_sb_flags = sb->s_flags;
1169 old_opts.s_mount_opt = sbi->s_mount_opt;
1170 old_opts.s_resuid = sbi->s_resuid;
1171 old_opts.s_resgid = sbi->s_resgid;
1da177e4
LT		 1172
1173 /*
1174 * Allow the "check" option to be passed as a remount option.
1175 */
50a52234
JK		 1176 if (!parse_options (data, sbi)) {
1177 err = -EINVAL;
1178 goto restore_opts;
1179 }
1da177e4
LT		 1180
1181 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1182 ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1183
266f5aa0
CO		 1184 ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset
1185 EXT2_MOUNT_XIP if not */
1186
1187 if ((ext2_use_xip(sb)) && (sb->s_blocksize != PAGE_SIZE)) {
1188 printk("XIP: Unsupported blocksize\n");
ddc80bd7 1189 err = -EINVAL;
266f5aa0
CO		 1190 goto restore_opts;
1191 }
1192
1da177e4 1193 es = sbi->s_es;
6d79125b
CO		 1194 if (((sbi->s_mount_opt & EXT2_MOUNT_XIP) !=
1195 (old_mount_opt & EXT2_MOUNT_XIP)) &&
0e4a9b59
CO		 1196 invalidate_inodes(sb)) {
1197 ext2_warning(sb, __func__, "refusing change of xip flag "
1198 "with busy inodes while remounting");
1199 sbi->s_mount_opt &= ~EXT2_MOUNT_XIP;
1200 sbi->s_mount_opt |= old_mount_opt & EXT2_MOUNT_XIP;
1201 }
337eb00a
AIB		 1202 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) {
1203 unlock_kernel();
1da177e4 1204 return 0;
337eb00a 1205 }
1da177e4
LT		 1206 if (*flags & MS_RDONLY) {
1207 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS ||
337eb00a
AIB		 1208 !(sbi->s_mount_state & EXT2_VALID_FS)) {
1209 unlock_kernel();
1da177e4 1210 return 0;
337eb00a 1211 }
1da177e4
LT		 1212 /*
1213 * OK, we are remounting a valid rw partition rdonly, so set
1214 * the rdonly flag and then mark the partition as valid again.
1215 */
1216 es->s_state = cpu_to_le16(sbi->s_mount_state);
1217 es->s_mtime = cpu_to_le32(get_seconds());
1218 } else {
1219 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb,
1220 ~EXT2_FEATURE_RO_COMPAT_SUPP);
1221 if (ret) {
1222 printk("EXT2-fs: %s: couldn't remount RDWR because of "
1223 "unsupported optional features (%x).\n",
1224 sb->s_id, le32_to_cpu(ret));
50a52234
JK		 1225 err = -EROFS;
1226 goto restore_opts;
1da177e4
LT		 1227 }
1228 /*
1229 * Mounting a RDONLY partition read-write, so reread and
1230 * store the current valid flag. (It may have been changed
1231 * by e2fsck since we originally mounted the partition.)
1232 */
1233 sbi->s_mount_state = le16_to_cpu(es->s_state);
1234 if (!ext2_setup_super (sb, es, 0))
1235 sb->s_flags &= ~MS_RDONLY;
1236 }
1237 ext2_sync_super(sb, es);
337eb00a 1238 unlock_kernel();
1da177e4 1239 return 0;
50a52234
JK		 1240restore_opts:
1241 sbi->s_mount_opt = old_opts.s_mount_opt;
1242 sbi->s_resuid = old_opts.s_resuid;
1243 sbi->s_resgid = old_opts.s_resgid;
1244 sb->s_flags = old_sb_flags;
337eb00a 1245 unlock_kernel();
50a52234 1246 return err;
1da177e4
LT		 1247}
1248
726c3342 1249static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf)
1da177e4 1250{
726c3342 1251 struct super_block *sb = dentry->d_sb;
1da177e4 1252 struct ext2_sb_info *sbi = EXT2_SB(sb);
e4fca01e 1253 struct ext2_super_block *es = sbi->s_es;
e4fca01e 1254 u64 fsid;
1da177e4
LT		 1255
1256 if (test_opt (sb, MINIX_DF))
2235219b
BP		 1257 sbi->s_overhead_last = 0;
1258 else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
1259 unsigned long i, overhead = 0;
1260 smp_rmb();
1261
1da177e4 1262 /*
2235219b
BP		 1263 * Compute the overhead (FS structures). This is constant
1264 * for a given filesystem unless the number of block groups
1265 * changes so we cache the previous value until it does.
1da177e4
LT		 1266 */
1267
1268 /*
1269 * All of the blocks before first_data_block are
1270 * overhead
1271 */
e4fca01e 1272 overhead = le32_to_cpu(es->s_first_data_block);
1da177e4
LT		 1273
1274 /*
1275 * Add the overhead attributed to the superblock and
1276 * block group descriptors. If the sparse superblocks
1277 * feature is turned on, then not all groups have this.
1278 */
1279 for (i = 0; i < sbi->s_groups_count; i++)
1280 overhead += ext2_bg_has_super(sb, i) +
1281 ext2_bg_num_gdb(sb, i);
1282
1283 /*
1284 * Every block group has an inode bitmap, a block
1285 * bitmap, and an inode table.
1286 */
1287 overhead += (sbi->s_groups_count *
1288 (2 + sbi->s_itb_per_group));
2235219b
BP		 1289 sbi->s_overhead_last = overhead;
1290 smp_wmb();
1291 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
1da177e4
LT		 1292 }
1293
1294 buf->f_type = EXT2_SUPER_MAGIC;
1295 buf->f_bsize = sb->s_blocksize;
2235219b 1296 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
1da177e4 1297 buf->f_bfree = ext2_count_free_blocks(sb);
2235219b 1298 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
e4fca01e
PE		 1299 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
1300 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
1da177e4 1301 buf->f_bavail = 0;
e4fca01e
PE		 1302 buf->f_files = le32_to_cpu(es->s_inodes_count);
1303 buf->f_ffree = ext2_count_free_inodes(sb);
2235219b 1304 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
1da177e4 1305 buf->f_namelen = EXT2_NAME_LEN;
e4fca01e
PE		 1306 fsid = le64_to_cpup((void *)es->s_uuid) ^
1307 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
1308 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
1309 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
1da177e4
LT		 1310 return 0;
1311}
1312
454e2398
DH		 1313static int ext2_get_sb(struct file_system_type *fs_type,
1314 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1da177e4 1315{
454e2398 1316 return get_sb_bdev(fs_type, flags, dev_name, data, ext2_fill_super, mnt);
1da177e4
LT		 1317}
1318
1319#ifdef CONFIG_QUOTA
1320
1321/* Read data from quotafile - avoid pagecache and such because we cannot afford
1322 * acquiring the locks... As quota files are never truncated and quota code
1323 * itself serializes the operations (and noone else should touch the files)
1324 * we don't have to be afraid of races */
1325static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data,
1326 size_t len, loff_t off)
1327{
1328 struct inode *inode = sb_dqopt(sb)->files[type];
1329 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1330 int err = 0;
1331 int offset = off & (sb->s_blocksize - 1);
1332 int tocopy;
1333 size_t toread;
1334 struct buffer_head tmp_bh;
1335 struct buffer_head *bh;
1336 loff_t i_size = i_size_read(inode);
1337
1338 if (off > i_size)
1339 return 0;
1340 if (off+len > i_size)
1341 len = i_size-off;
1342 toread = len;
1343 while (toread > 0) {
1344 tocopy = sb->s_blocksize - offset < toread ?
1345 sb->s_blocksize - offset : toread;
1346
1347 tmp_bh.b_state = 0;
c16831b4 1348 tmp_bh.b_size = sb->s_blocksize;
1da177e4 1349 err = ext2_get_block(inode, blk, &tmp_bh, 0);
a686cd89 1350 if (err < 0)
1da177e4
LT		 1351 return err;
1352 if (!buffer_mapped(&tmp_bh)) /* A hole? */
1353 memset(data, 0, tocopy);
1354 else {
1355 bh = sb_bread(sb, tmp_bh.b_blocknr);
1356 if (!bh)
1357 return -EIO;
1358 memcpy(data, bh->b_data+offset, tocopy);
1359 brelse(bh);
1360 }
1361 offset = 0;
1362 toread -= tocopy;
1363 data += tocopy;
1364 blk++;
1365 }
1366 return len;
1367}
1368
1369/* Write to quotafile */
1370static ssize_t ext2_quota_write(struct super_block *sb, int type,
1371 const char *data, size_t len, loff_t off)
1372{
1373 struct inode *inode = sb_dqopt(sb)->files[type];
1374 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1375 int err = 0;
1376 int offset = off & (sb->s_blocksize - 1);
1377 int tocopy;
1378 size_t towrite = len;
1379 struct buffer_head tmp_bh;
1380 struct buffer_head *bh;
1381
5c81a419 1382 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
1da177e4
LT		 1383 while (towrite > 0) {
1384 tocopy = sb->s_blocksize - offset < towrite ?
1385 sb->s_blocksize - offset : towrite;
1386
1387 tmp_bh.b_state = 0;
1388 err = ext2_get_block(inode, blk, &tmp_bh, 1);
a686cd89 1389 if (err < 0)
1da177e4
LT		 1390 goto out;
1391 if (offset || tocopy != EXT2_BLOCK_SIZE(sb))
1392 bh = sb_bread(sb, tmp_bh.b_blocknr);
1393 else
1394 bh = sb_getblk(sb, tmp_bh.b_blocknr);
1395 if (!bh) {
1396 err = -EIO;
1397 goto out;
1398 }
1399 lock_buffer(bh);
1400 memcpy(bh->b_data+offset, data, tocopy);
1401 flush_dcache_page(bh->b_page);
1402 set_buffer_uptodate(bh);
1403 mark_buffer_dirty(bh);
1404 unlock_buffer(bh);
1405 brelse(bh);
1406 offset = 0;
1407 towrite -= tocopy;
1408 data += tocopy;
1409 blk++;
1410 }
1411out:
a069e9ce
DC		 1412 if (len == towrite) {
1413 mutex_unlock(&inode->i_mutex);
1da177e4 1414 return err;
a069e9ce 1415 }
1da177e4
LT		 1416 if (inode->i_size < off+len-towrite)
1417 i_size_write(inode, off+len-towrite);
1418 inode->i_version++;
1419 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
1420 mark_inode_dirty(inode);
1b1dcc1b 1421 mutex_unlock(&inode->i_mutex);
1da177e4
LT		 1422 return len - towrite;
1423}
1424
1425#endif
1426
1427static struct file_system_type ext2_fs_type = {
1428 .owner = THIS_MODULE,
1429 .name = "ext2",
1430 .get_sb = ext2_get_sb,
1431 .kill_sb = kill_block_super,
1432 .fs_flags = FS_REQUIRES_DEV,
1433};
1434
1435static int __init init_ext2_fs(void)
1436{
1437 int err = init_ext2_xattr();
1438 if (err)
1439 return err;
1440 err = init_inodecache();
1441 if (err)
1442 goto out1;
1443 err = register_filesystem(&ext2_fs_type);
1444 if (err)
1445 goto out;
1446 return 0;
1447out:
1448 destroy_inodecache();
1449out1:
1450 exit_ext2_xattr();
1451 return err;
1452}
1453
1454static void __exit exit_ext2_fs(void)
1455{
1456 unregister_filesystem(&ext2_fs_type);
1457 destroy_inodecache();
1458 exit_ext2_xattr();
1459}
1460
1461module_init(init_ext2_fs)
1462module_exit(exit_ext2_fs)
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