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