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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris...
[linux.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 ([email protected])
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller ([email protected]), 1995
17 */
18
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>
1da177e4
LT		 34#include <asm/uaccess.h>
35#include "ext2.h"
36#include "xattr.h"
37#include "acl.h"
6d79125b 38#include "xip.h"
1da177e4
LT		 39
40static void ext2_sync_super(struct super_block *sb,
41 struct ext2_super_block *es);
42static int ext2_remount (struct super_block * sb, int * flags, char * data);
726c3342 43static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf);
1da177e4
LT		 44
45void ext2_error (struct super_block * sb, const char * function,
46 const char * fmt, ...)
47{
48 va_list args;
49 struct ext2_sb_info *sbi = EXT2_SB(sb);
50 struct ext2_super_block *es = sbi->s_es;
51
52 if (!(sb->s_flags & MS_RDONLY)) {
53 sbi->s_mount_state |= EXT2_ERROR_FS;
54 es->s_state =
55 cpu_to_le16(le16_to_cpu(es->s_state) | EXT2_ERROR_FS);
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
93 ext2_warning(sb, __FUNCTION__,
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
117 ext2_xattr_put_super(sb);
118 if (!(sb->s_flags & MS_RDONLY)) {
119 struct ext2_super_block *es = sbi->s_es;
120
121 es->s_state = cpu_to_le16(sbi->s_mount_state);
122 ext2_sync_super(sb, es);
123 }
124 db_count = sbi->s_gdb_count;
125 for (i = 0; i < db_count; i++)
126 if (sbi->s_group_desc[i])
127 brelse (sbi->s_group_desc[i]);
128 kfree(sbi->s_group_desc);
129 kfree(sbi->s_debts);
130 percpu_counter_destroy(&sbi->s_freeblocks_counter);
131 percpu_counter_destroy(&sbi->s_freeinodes_counter);
132 percpu_counter_destroy(&sbi->s_dirs_counter);
133 brelse (sbi->s_sbh);
134 sb->s_fs_info = NULL;
135 kfree(sbi);
136
137 return;
138}
139
e18b890b 140static struct kmem_cache * ext2_inode_cachep;
1da177e4
LT		 141
142static struct inode *ext2_alloc_inode(struct super_block *sb)
143{
144 struct ext2_inode_info *ei;
e94b1766 145 ei = (struct ext2_inode_info *)kmem_cache_alloc(ext2_inode_cachep, GFP_KERNEL);
1da177e4
LT		 146 if (!ei)
147 return NULL;
148#ifdef CONFIG_EXT2_FS_POSIX_ACL
149 ei->i_acl = EXT2_ACL_NOT_CACHED;
150 ei->i_default_acl = EXT2_ACL_NOT_CACHED;
151#endif
a686cd89 152 ei->i_block_alloc_info = NULL;
1da177e4
LT		 153 ei->vfs_inode.i_version = 1;
154 return &ei->vfs_inode;
155}
156
157static void ext2_destroy_inode(struct inode *inode)
158{
159 kmem_cache_free(ext2_inode_cachep, EXT2_I(inode));
160}
161
4ba9b9d0 162static void init_once(struct kmem_cache * cachep, void *foo)
1da177e4
LT		 163{
164 struct ext2_inode_info *ei = (struct ext2_inode_info *) foo;
165
a35afb83 166 rwlock_init(&ei->i_meta_lock);
1da177e4 167#ifdef CONFIG_EXT2_FS_XATTR
a35afb83 168 init_rwsem(&ei->xattr_sem);
1da177e4 169#endif
a686cd89 170 mutex_init(&ei->truncate_mutex);
a35afb83 171 inode_init_once(&ei->vfs_inode);
1da177e4 172}
20c2df83 173
1da177e4
LT		 174static int init_inodecache(void)
175{
176 ext2_inode_cachep = kmem_cache_create("ext2_inode_cache",
177 sizeof(struct ext2_inode_info),
fffb60f9
PJ		 178 0, (SLAB_RECLAIM_ACCOUNT|
179 SLAB_MEM_SPREAD),
20c2df83 180 init_once);
1da177e4
LT		 181 if (ext2_inode_cachep == NULL)
182 return -ENOMEM;
183 return 0;
184}
185
186static void destroy_inodecache(void)
187{
1a1d92c1 188 kmem_cache_destroy(ext2_inode_cachep);
1da177e4
LT		 189}
190
191static void ext2_clear_inode(struct inode *inode)
192{
a686cd89 193 struct ext2_block_alloc_info *rsv = EXT2_I(inode)->i_block_alloc_info;
1da177e4
LT		 194#ifdef CONFIG_EXT2_FS_POSIX_ACL
195 struct ext2_inode_info *ei = EXT2_I(inode);
196
197 if (ei->i_acl && ei->i_acl != EXT2_ACL_NOT_CACHED) {
198 posix_acl_release(ei->i_acl);
199 ei->i_acl = EXT2_ACL_NOT_CACHED;
200 }
201 if (ei->i_default_acl && ei->i_default_acl != EXT2_ACL_NOT_CACHED) {
202 posix_acl_release(ei->i_default_acl);
203 ei->i_default_acl = EXT2_ACL_NOT_CACHED;
204 }
205#endif
a686cd89
MB		 206 ext2_discard_reservation(inode);
207 EXT2_I(inode)->i_block_alloc_info = NULL;
208 if (unlikely(rsv))
209 kfree(rsv);
1da177e4
LT		 210}
211
8fc2751b
MB		 212static int ext2_show_options(struct seq_file *seq, struct vfsmount *vfs)
213{
93d44cb2
MS		 214 struct super_block *sb = vfs->mnt_sb;
215 struct ext2_sb_info *sbi = EXT2_SB(sb);
216 struct ext2_super_block *es = sbi->s_es;
217 unsigned long def_mount_opts;
8fc2751b 218
93d44cb2
MS		 219 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
220
221 if (sbi->s_sb_block != 1)
222 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
223 if (test_opt(sb, MINIX_DF))
224 seq_puts(seq, ",minixdf");
225 if (test_opt(sb, GRPID))
8fc2751b 226 seq_puts(seq, ",grpid");
93d44cb2
MS		 227 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS))
228 seq_puts(seq, ",nogrpid");
229 if (sbi->s_resuid != EXT2_DEF_RESUID ||
230 le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) {
231 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
232 }
233 if (sbi->s_resgid != EXT2_DEF_RESGID ||
234 le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) {
235 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
236 }
14e11e10 237 if (test_opt(sb, ERRORS_RO)) {
93d44cb2
MS		 238 int def_errors = le16_to_cpu(es->s_errors);
239
240 if (def_errors == EXT2_ERRORS_PANIC ||
14e11e10
AK		 241 def_errors == EXT2_ERRORS_CONTINUE) {
242 seq_puts(seq, ",errors=remount-ro");
93d44cb2
MS		 243 }
244 }
14e11e10
AK		 245 if (test_opt(sb, ERRORS_CONT))
246 seq_puts(seq, ",errors=continue");
93d44cb2
MS		 247 if (test_opt(sb, ERRORS_PANIC))
248 seq_puts(seq, ",errors=panic");
249 if (test_opt(sb, NO_UID32))
250 seq_puts(seq, ",nouid32");
251 if (test_opt(sb, DEBUG))
252 seq_puts(seq, ",debug");
253 if (test_opt(sb, OLDALLOC))
254 seq_puts(seq, ",oldalloc");
255
256#ifdef CONFIG_EXT2_FS_XATTR
257 if (test_opt(sb, XATTR_USER))
258 seq_puts(seq, ",user_xattr");
259 if (!test_opt(sb, XATTR_USER) &&
260 (def_mount_opts & EXT2_DEFM_XATTR_USER)) {
261 seq_puts(seq, ",nouser_xattr");
262 }
263#endif
264
265#ifdef CONFIG_EXT2_FS_POSIX_ACL
266 if (test_opt(sb, POSIX_ACL))
267 seq_puts(seq, ",acl");
268 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL))
269 seq_puts(seq, ",noacl");
270#endif
271
272 if (test_opt(sb, NOBH))
273 seq_puts(seq, ",nobh");
8fc2751b
MB		 274
275#if defined(CONFIG_QUOTA)
276 if (sbi->s_mount_opt & EXT2_MOUNT_USRQUOTA)
277 seq_puts(seq, ",usrquota");
278
279 if (sbi->s_mount_opt & EXT2_MOUNT_GRPQUOTA)
280 seq_puts(seq, ",grpquota");
281#endif
282
83541796
CO		 283#if defined(CONFIG_EXT2_FS_XIP)
284 if (sbi->s_mount_opt & EXT2_MOUNT_XIP)
285 seq_puts(seq, ",xip");
286#endif
287
35c879dc
MS		 288 if (!test_opt(sb, RESERVATION))
289 seq_puts(seq, ",noreservation");
290
8fc2751b
MB		 291 return 0;
292}
293
1da177e4
LT		 294#ifdef CONFIG_QUOTA
295static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off);
296static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off);
297#endif
298
ee9b6d61 299static const struct super_operations ext2_sops = {
1da177e4
LT		 300 .alloc_inode = ext2_alloc_inode,
301 .destroy_inode = ext2_destroy_inode,
1da177e4
LT		 302 .write_inode = ext2_write_inode,
303 .delete_inode = ext2_delete_inode,
304 .put_super = ext2_put_super,
305 .write_super = ext2_write_super,
306 .statfs = ext2_statfs,
307 .remount_fs = ext2_remount,
308 .clear_inode = ext2_clear_inode,
8fc2751b 309 .show_options = ext2_show_options,
1da177e4
LT		 310#ifdef CONFIG_QUOTA
311 .quota_read = ext2_quota_read,
312 .quota_write = ext2_quota_write,
313#endif
314};
315
2e4c68e3
CH		 316static struct inode *ext2_nfs_get_inode(struct super_block *sb,
317 u64 ino, u32 generation)
ecaff756 318{
ecaff756 319 struct inode *inode;
ecaff756
N		 320
321 if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO)
322 return ERR_PTR(-ESTALE);
323 if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count))
324 return ERR_PTR(-ESTALE);
325
326 /* iget isn't really right if the inode is currently unallocated!!
327 * ext2_read_inode currently does appropriate checks, but
328 * it might be "neater" to call ext2_get_inode first and check
329 * if the inode is valid.....
330 */
52fcf703
DH		 331 inode = ext2_iget(sb, ino);
332 if (IS_ERR(inode))
333 return ERR_CAST(inode);
334 if (generation && inode->i_generation != generation) {
ecaff756
N		 335 /* we didn't find the right inode.. */
336 iput(inode);
337 return ERR_PTR(-ESTALE);
338 }
2e4c68e3
CH		 339 return inode;
340}
341
342static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid,
343 int fh_len, int fh_type)
344{
345 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
346 ext2_nfs_get_inode);
347}
348
349static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid,
350 int fh_len, int fh_type)
351{
352 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
353 ext2_nfs_get_inode);
ecaff756
N		 354}
355
1da177e4
LT		 356/* Yes, most of these are left as NULL!!
357 * A NULL value implies the default, which works with ext2-like file
358 * systems, but can be improved upon.
359 * Currently only get_parent is required.
360 */
39655164 361static const struct export_operations ext2_export_ops = {
2e4c68e3
CH		 362 .fh_to_dentry = ext2_fh_to_dentry,
363 .fh_to_parent = ext2_fh_to_parent,
1da177e4
LT		 364 .get_parent = ext2_get_parent,
365};
366
367static unsigned long get_sb_block(void **data)
368{
369 unsigned long sb_block;
370 char *options = (char *) *data;
371
372 if (!options || strncmp(options, "sb=", 3) != 0)
373 return 1; /* Default location */
374 options += 3;
375 sb_block = simple_strtoul(options, &options, 0);
376 if (*options && *options != ',') {
377 printk("EXT2-fs: Invalid sb specification: %s\n",
378 (char *) *data);
379 return 1;
380 }
381 if (*options == ',')
382 options++;
383 *data = (void *) options;
384 return sb_block;
385}
386
387enum {
388 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
8fc2751b 389 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic,
2860b733 390 Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug,
8fc2751b
MB		 391 Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr,
392 Opt_acl, Opt_noacl, Opt_xip, Opt_ignore, Opt_err, Opt_quota,
a686cd89 393 Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation
1da177e4
LT		 394};
395
396static match_table_t tokens = {
397 {Opt_bsd_df, "bsddf"},
398 {Opt_minix_df, "minixdf"},
399 {Opt_grpid, "grpid"},
400 {Opt_grpid, "bsdgroups"},
401 {Opt_nogrpid, "nogrpid"},
402 {Opt_nogrpid, "sysvgroups"},
403 {Opt_resgid, "resgid=%u"},
404 {Opt_resuid, "resuid=%u"},
405 {Opt_sb, "sb=%u"},
406 {Opt_err_cont, "errors=continue"},
407 {Opt_err_panic, "errors=panic"},
408 {Opt_err_ro, "errors=remount-ro"},
409 {Opt_nouid32, "nouid32"},
410 {Opt_nocheck, "check=none"},
411 {Opt_nocheck, "nocheck"},
1da177e4
LT		 412 {Opt_debug, "debug"},
413 {Opt_oldalloc, "oldalloc"},
414 {Opt_orlov, "orlov"},
415 {Opt_nobh, "nobh"},
416 {Opt_user_xattr, "user_xattr"},
417 {Opt_nouser_xattr, "nouser_xattr"},
418 {Opt_acl, "acl"},
419 {Opt_noacl, "noacl"},
6d79125b 420 {Opt_xip, "xip"},
8fc2751b 421 {Opt_grpquota, "grpquota"},
1da177e4 422 {Opt_ignore, "noquota"},
8fc2751b
MB		 423 {Opt_quota, "quota"},
424 {Opt_usrquota, "usrquota"},
a686cd89
MB		 425 {Opt_reservation, "reservation"},
426 {Opt_noreservation, "noreservation"},
1da177e4
LT		 427 {Opt_err, NULL}
428};
429
430static int parse_options (char * options,
431 struct ext2_sb_info *sbi)
432{
433 char * p;
434 substring_t args[MAX_OPT_ARGS];
1da177e4
LT		 435 int option;
436
437 if (!options)
438 return 1;
439
440 while ((p = strsep (&options, ",")) != NULL) {
441 int token;
442 if (!*p)
443 continue;
444
445 token = match_token(p, tokens, args);
446 switch (token) {
447 case Opt_bsd_df:
448 clear_opt (sbi->s_mount_opt, MINIX_DF);
449 break;
450 case Opt_minix_df:
451 set_opt (sbi->s_mount_opt, MINIX_DF);
452 break;
453 case Opt_grpid:
454 set_opt (sbi->s_mount_opt, GRPID);
455 break;
456 case Opt_nogrpid:
457 clear_opt (sbi->s_mount_opt, GRPID);
458 break;
459 case Opt_resuid:
460 if (match_int(&args[0], &option))
461 return 0;
462 sbi->s_resuid = option;
463 break;
464 case Opt_resgid:
465 if (match_int(&args[0], &option))
466 return 0;
467 sbi->s_resgid = option;
468 break;
469 case Opt_sb:
470 /* handled by get_sb_block() instead of here */
471 /* *sb_block = match_int(&args[0]); */
472 break;
473 case Opt_err_panic:
5a2b4062
VA		 474 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
475 clear_opt (sbi->s_mount_opt, ERRORS_RO);
476 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
1da177e4
LT		 477 break;
478 case Opt_err_ro:
5a2b4062
VA		 479 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
480 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
481 set_opt (sbi->s_mount_opt, ERRORS_RO);
1da177e4
LT		 482 break;
483 case Opt_err_cont:
5a2b4062
VA		 484 clear_opt (sbi->s_mount_opt, ERRORS_RO);
485 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
486 set_opt (sbi->s_mount_opt, ERRORS_CONT);
1da177e4
LT		 487 break;
488 case Opt_nouid32:
489 set_opt (sbi->s_mount_opt, NO_UID32);
490 break;
1da177e4
LT		 491 case Opt_nocheck:
492 clear_opt (sbi->s_mount_opt, CHECK);
493 break;
494 case Opt_debug:
495 set_opt (sbi->s_mount_opt, DEBUG);
496 break;
497 case Opt_oldalloc:
498 set_opt (sbi->s_mount_opt, OLDALLOC);
499 break;
500 case Opt_orlov:
501 clear_opt (sbi->s_mount_opt, OLDALLOC);
502 break;
503 case Opt_nobh:
504 set_opt (sbi->s_mount_opt, NOBH);
505 break;
506#ifdef CONFIG_EXT2_FS_XATTR
507 case Opt_user_xattr:
508 set_opt (sbi->s_mount_opt, XATTR_USER);
509 break;
510 case Opt_nouser_xattr:
511 clear_opt (sbi->s_mount_opt, XATTR_USER);
512 break;
513#else
514 case Opt_user_xattr:
515 case Opt_nouser_xattr:
516 printk("EXT2 (no)user_xattr options not supported\n");
517 break;
518#endif
519#ifdef CONFIG_EXT2_FS_POSIX_ACL
520 case Opt_acl:
521 set_opt(sbi->s_mount_opt, POSIX_ACL);
522 break;
523 case Opt_noacl:
524 clear_opt(sbi->s_mount_opt, POSIX_ACL);
525 break;
526#else
527 case Opt_acl:
528 case Opt_noacl:
529 printk("EXT2 (no)acl options not supported\n");
530 break;
531#endif
6d79125b
CO		 532 case Opt_xip:
533#ifdef CONFIG_EXT2_FS_XIP
534 set_opt (sbi->s_mount_opt, XIP);
535#else
536 printk("EXT2 xip option not supported\n");
537#endif
538 break;
8fc2751b
MB		 539
540#if defined(CONFIG_QUOTA)
541 case Opt_quota:
542 case Opt_usrquota:
543 set_opt(sbi->s_mount_opt, USRQUOTA);
544 break;
545
546 case Opt_grpquota:
547 set_opt(sbi->s_mount_opt, GRPQUOTA);
548 break;
549#else
550 case Opt_quota:
551 case Opt_usrquota:
552 case Opt_grpquota:
553 printk(KERN_ERR
554 "EXT2-fs: quota operations not supported.\n");
555
556 break;
557#endif
558
a686cd89
MB		 559 case Opt_reservation:
560 set_opt(sbi->s_mount_opt, RESERVATION);
561 printk("reservations ON\n");
562 break;
563 case Opt_noreservation:
564 clear_opt(sbi->s_mount_opt, RESERVATION);
565 printk("reservations OFF\n");
566 break;
1da177e4
LT		 567 case Opt_ignore:
568 break;
569 default:
570 return 0;
571 }
572 }
1da177e4
LT		 573 return 1;
574}
575
576static int ext2_setup_super (struct super_block * sb,
577 struct ext2_super_block * es,
578 int read_only)
579{
580 int res = 0;
581 struct ext2_sb_info *sbi = EXT2_SB(sb);
582
583 if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) {
584 printk ("EXT2-fs warning: revision level too high, "
585 "forcing read-only mode\n");
586 res = MS_RDONLY;
587 }
588 if (read_only)
589 return res;
590 if (!(sbi->s_mount_state & EXT2_VALID_FS))
591 printk ("EXT2-fs warning: mounting unchecked fs, "
592 "running e2fsck is recommended\n");
593 else if ((sbi->s_mount_state & EXT2_ERROR_FS))
594 printk ("EXT2-fs warning: mounting fs with errors, "
595 "running e2fsck is recommended\n");
596 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
597 le16_to_cpu(es->s_mnt_count) >=
598 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
599 printk ("EXT2-fs warning: maximal mount count reached, "
600 "running e2fsck is recommended\n");
601 else if (le32_to_cpu(es->s_checkinterval) &&
602 (le32_to_cpu(es->s_lastcheck) + le32_to_cpu(es->s_checkinterval) <= get_seconds()))
603 printk ("EXT2-fs warning: checktime reached, "
604 "running e2fsck is recommended\n");
605 if (!le16_to_cpu(es->s_max_mnt_count))
606 es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT);
607 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
608 ext2_write_super(sb);
609 if (test_opt (sb, DEBUG))
610 printk ("[EXT II FS %s, %s, bs=%lu, fs=%lu, gc=%lu, "
611 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
612 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize,
613 sbi->s_frag_size,
614 sbi->s_groups_count,
615 EXT2_BLOCKS_PER_GROUP(sb),
616 EXT2_INODES_PER_GROUP(sb),
617 sbi->s_mount_opt);
1da177e4
LT		 618 return res;
619}
620
197cd65a 621static int ext2_check_descriptors(struct super_block *sb)
1da177e4
LT		 622{
623 int i;
1da177e4 624 struct ext2_sb_info *sbi = EXT2_SB(sb);
41f04d85
ES		 625 unsigned long first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
626 unsigned long last_block;
1da177e4
LT		 627
628 ext2_debug ("Checking group descriptors");
629
197cd65a
AM		 630 for (i = 0; i < sbi->s_groups_count; i++) {
631 struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL);
632
41f04d85
ES		 633 if (i == sbi->s_groups_count - 1)
634 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
635 else
636 last_block = first_block +
637 (EXT2_BLOCKS_PER_GROUP(sb) - 1);
638
41f04d85
ES		 639 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
640 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1da177e4
LT		 641 {
642 ext2_error (sb, "ext2_check_descriptors",
643 "Block bitmap for group %d"
644 " not in group (block %lu)!",
645 i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap));
646 return 0;
647 }
41f04d85
ES		 648 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
649 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1da177e4
LT		 650 {
651 ext2_error (sb, "ext2_check_descriptors",
652 "Inode bitmap for group %d"
653 " not in group (block %lu)!",
654 i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap));
655 return 0;
656 }
41f04d85 657 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
780dcdb2 658 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
41f04d85 659 last_block)
1da177e4
LT		 660 {
661 ext2_error (sb, "ext2_check_descriptors",
662 "Inode table for group %d"
663 " not in group (block %lu)!",
664 i, (unsigned long) le32_to_cpu(gdp->bg_inode_table));
665 return 0;
666 }
41f04d85 667 first_block += EXT2_BLOCKS_PER_GROUP(sb);
1da177e4
LT		 668 }
669 return 1;
670}
671
1da177e4
LT		 672/*
673 * Maximal file size. There is a direct, and {,double-,triple-}indirect
674 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
675 * We need to be 1 filesystem block less than the 2^32 sector limit.
676 */
677static loff_t ext2_max_size(int bits)
678{
679 loff_t res = EXT2_NDIR_BLOCKS;
902be4c5
AK		 680 int meta_blocks;
681 loff_t upper_limit;
682
683 /* This is calculated to be the largest file size for a
684 * dense, file such that the total number of
1da177e4 685 * sectors in the file, including data and all indirect blocks,
902be4c5
AK		 686 * does not exceed 2^32 -1
687 * __u32 i_blocks representing the total number of
688 * 512 bytes blocks of the file
689 */
690 upper_limit = (1LL << 32) - 1;
691
692 /* total blocks in file system block size */
693 upper_limit >>= (bits - 9);
694
695
696 /* indirect blocks */
697 meta_blocks = 1;
698 /* double indirect blocks */
699 meta_blocks += 1 + (1LL << (bits-2));
700 /* tripple indirect blocks */
701 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
702
703 upper_limit -= meta_blocks;
704 upper_limit <<= bits;
1da177e4
LT		 705
706 res += 1LL << (bits-2);
707 res += 1LL << (2*(bits-2));
708 res += 1LL << (3*(bits-2));
709 res <<= bits;
710 if (res > upper_limit)
711 res = upper_limit;
902be4c5
AK		 712
713 if (res > MAX_LFS_FILESIZE)
714 res = MAX_LFS_FILESIZE;
715
1da177e4
LT		 716 return res;
717}
718
719static unsigned long descriptor_loc(struct super_block *sb,
720 unsigned long logic_sb_block,
721 int nr)
722{
723 struct ext2_sb_info *sbi = EXT2_SB(sb);
724 unsigned long bg, first_data_block, first_meta_bg;
725 int has_super = 0;
726
727 first_data_block = le32_to_cpu(sbi->s_es->s_first_data_block);
728 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
729
730 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) ||
731 nr < first_meta_bg)
732 return (logic_sb_block + nr + 1);
733 bg = sbi->s_desc_per_block * nr;
734 if (ext2_bg_has_super(sb, bg))
735 has_super = 1;
736 return (first_data_block + has_super + (bg * sbi->s_blocks_per_group));
737}
738
739static int ext2_fill_super(struct super_block *sb, void *data, int silent)
740{
741 struct buffer_head * bh;
742 struct ext2_sb_info * sbi;
743 struct ext2_super_block * es;
744 struct inode *root;
745 unsigned long block;
746 unsigned long sb_block = get_sb_block(&data);
747 unsigned long logic_sb_block;
748 unsigned long offset = 0;
749 unsigned long def_mount_opts;
52fcf703 750 long ret = -EINVAL;
1da177e4
LT		 751 int blocksize = BLOCK_SIZE;
752 int db_count;
753 int i, j;
754 __le32 features;
833f4077 755 int err;
1da177e4 756
f8314dc6 757 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1da177e4
LT		 758 if (!sbi)
759 return -ENOMEM;
760 sb->s_fs_info = sbi;
93d44cb2 761 sbi->s_sb_block = sb_block;
1da177e4
LT		 762
763 /*
764 * See what the current blocksize for the device is, and
765 * use that as the blocksize. Otherwise (or if the blocksize
766 * is smaller than the default) use the default.
767 * This is important for devices that have a hardware
768 * sectorsize that is larger than the default.
769 */
770 blocksize = sb_min_blocksize(sb, BLOCK_SIZE);
771 if (!blocksize) {
772 printk ("EXT2-fs: unable to set blocksize\n");
773 goto failed_sbi;
774 }
775
776 /*
777 * If the superblock doesn't start on a hardware sector boundary,
778 * calculate the offset.
779 */
780 if (blocksize != BLOCK_SIZE) {
781 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
782 offset = (sb_block*BLOCK_SIZE) % blocksize;
783 } else {
784 logic_sb_block = sb_block;
785 }
786
787 if (!(bh = sb_bread(sb, logic_sb_block))) {
788 printk ("EXT2-fs: unable to read superblock\n");
789 goto failed_sbi;
790 }
791 /*
792 * Note: s_es must be initialized as soon as possible because
793 * some ext2 macro-instructions depend on its value
794 */
795 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
796 sbi->s_es = es;
797 sb->s_magic = le16_to_cpu(es->s_magic);
798
799 if (sb->s_magic != EXT2_SUPER_MAGIC)
800 goto cantfind_ext2;
801
802 /* Set defaults before we parse the mount options */
803 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
804 if (def_mount_opts & EXT2_DEFM_DEBUG)
805 set_opt(sbi->s_mount_opt, DEBUG);
806 if (def_mount_opts & EXT2_DEFM_BSDGROUPS)
807 set_opt(sbi->s_mount_opt, GRPID);
808 if (def_mount_opts & EXT2_DEFM_UID16)
809 set_opt(sbi->s_mount_opt, NO_UID32);
2e7842b8 810#ifdef CONFIG_EXT2_FS_XATTR
1da177e4
LT		 811 if (def_mount_opts & EXT2_DEFM_XATTR_USER)
812 set_opt(sbi->s_mount_opt, XATTR_USER);
2e7842b8
HD		 813#endif
814#ifdef CONFIG_EXT2_FS_POSIX_ACL
1da177e4
LT		 815 if (def_mount_opts & EXT2_DEFM_ACL)
816 set_opt(sbi->s_mount_opt, POSIX_ACL);
2e7842b8 817#endif
1da177e4
LT		 818
819 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
820 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
14e11e10 821 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE)
5a2b4062 822 set_opt(sbi->s_mount_opt, ERRORS_CONT);
14e11e10
AK		 823 else
824 set_opt(sbi->s_mount_opt, ERRORS_RO);
1da177e4
LT		 825
826 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
827 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
828
a686cd89
MB		 829 set_opt(sbi->s_mount_opt, RESERVATION);
830
1da177e4
LT		 831 if (!parse_options ((char *) data, sbi))
832 goto failed_mount;
833
834 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
835 ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ?
836 MS_POSIXACL : 0);
837
6d79125b
CO		 838 ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset
839 EXT2_MOUNT_XIP if not */
840
1da177e4
LT		 841 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV &&
842 (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) ||
843 EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
844 EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U)))
845 printk("EXT2-fs warning: feature flags set on rev 0 fs, "
846 "running e2fsck is recommended\n");
847 /*
848 * Check feature flags regardless of the revision level, since we
849 * previously didn't change the revision level when setting the flags,
850 * so there is a chance incompat flags are set on a rev 0 filesystem.
851 */
852 features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP);
853 if (features) {
854 printk("EXT2-fs: %s: couldn't mount because of "
855 "unsupported optional features (%x).\n",
856 sb->s_id, le32_to_cpu(features));
857 goto failed_mount;
858 }
859 if (!(sb->s_flags & MS_RDONLY) &&
860 (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){
861 printk("EXT2-fs: %s: couldn't mount RDWR because of "
862 "unsupported optional features (%x).\n",
863 sb->s_id, le32_to_cpu(features));
864 goto failed_mount;
865 }
866
867 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
868
a8e3eff4 869 if (ext2_use_xip(sb) && blocksize != PAGE_SIZE) {
6d79125b
CO		 870 if (!silent)
871 printk("XIP: Unsupported blocksize\n");
872 goto failed_mount;
873 }
874
1da177e4
LT		 875 /* If the blocksize doesn't match, re-read the thing.. */
876 if (sb->s_blocksize != blocksize) {
877 brelse(bh);
878
879 if (!sb_set_blocksize(sb, blocksize)) {
880 printk(KERN_ERR "EXT2-fs: blocksize too small for device.\n");
881 goto failed_sbi;
882 }
883
884 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
885 offset = (sb_block*BLOCK_SIZE) % blocksize;
886 bh = sb_bread(sb, logic_sb_block);
887 if(!bh) {
888 printk("EXT2-fs: Couldn't read superblock on "
889 "2nd try.\n");
890 goto failed_sbi;
891 }
892 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
893 sbi->s_es = es;
894 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) {
895 printk ("EXT2-fs: Magic mismatch, very weird !\n");
896 goto failed_mount;
897 }
898 }
899
900 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits);
901
902 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) {
903 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
904 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
905 } else {
906 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
907 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
908 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) ||
d8ea6cf8 909 !is_power_of_2(sbi->s_inode_size) ||
1da177e4
LT		 910 (sbi->s_inode_size > blocksize)) {
911 printk ("EXT2-fs: unsupported inode size: %d\n",
912 sbi->s_inode_size);
913 goto failed_mount;
914 }
915 }
916
917 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE <<
918 le32_to_cpu(es->s_log_frag_size);
919 if (sbi->s_frag_size == 0)
920 goto cantfind_ext2;
921 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size;
922
923 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
924 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
925 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
926
927 if (EXT2_INODE_SIZE(sb) == 0)
928 goto cantfind_ext2;
929 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb);
607eb266 930 if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0)
1da177e4
LT		 931 goto cantfind_ext2;
932 sbi->s_itb_per_group = sbi->s_inodes_per_group /
933 sbi->s_inodes_per_block;
934 sbi->s_desc_per_block = sb->s_blocksize /
935 sizeof (struct ext2_group_desc);
936 sbi->s_sbh = bh;
937 sbi->s_mount_state = le16_to_cpu(es->s_state);
938 sbi->s_addr_per_block_bits =
f0d1b0b3 939 ilog2 (EXT2_ADDR_PER_BLOCK(sb));
1da177e4 940 sbi->s_desc_per_block_bits =
f0d1b0b3 941 ilog2 (EXT2_DESC_PER_BLOCK(sb));
1da177e4
LT		 942
943 if (sb->s_magic != EXT2_SUPER_MAGIC)
944 goto cantfind_ext2;
945
946 if (sb->s_blocksize != bh->b_size) {
947 if (!silent)
948 printk ("VFS: Unsupported blocksize on dev "
949 "%s.\n", sb->s_id);
950 goto failed_mount;
951 }
952
953 if (sb->s_blocksize != sbi->s_frag_size) {
954 printk ("EXT2-fs: fragsize %lu != blocksize %lu (not supported yet)\n",
955 sbi->s_frag_size, sb->s_blocksize);
956 goto failed_mount;
957 }
958
959 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) {
960 printk ("EXT2-fs: #blocks per group too big: %lu\n",
961 sbi->s_blocks_per_group);
962 goto failed_mount;
963 }
964 if (sbi->s_frags_per_group > sb->s_blocksize * 8) {
965 printk ("EXT2-fs: #fragments per group too big: %lu\n",
966 sbi->s_frags_per_group);
967 goto failed_mount;
968 }
969 if (sbi->s_inodes_per_group > sb->s_blocksize * 8) {
970 printk ("EXT2-fs: #inodes per group too big: %lu\n",
971 sbi->s_inodes_per_group);
972 goto failed_mount;
973 }
974
975 if (EXT2_BLOCKS_PER_GROUP(sb) == 0)
976 goto cantfind_ext2;
41f04d85
ES		 977 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
978 le32_to_cpu(es->s_first_data_block) - 1)
979 / EXT2_BLOCKS_PER_GROUP(sb)) + 1;
1da177e4
LT		 980 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
981 EXT2_DESC_PER_BLOCK(sb);
982 sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL);
983 if (sbi->s_group_desc == NULL) {
984 printk ("EXT2-fs: not enough memory\n");
985 goto failed_mount;
986 }
1da177e4 987 bgl_lock_init(&sbi->s_blockgroup_lock);
dd00cc48 988 sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL);
1da177e4
LT		 989 if (!sbi->s_debts) {
990 printk ("EXT2-fs: not enough memory\n");
991 goto failed_mount_group_desc;
992 }
1da177e4
LT		 993 for (i = 0; i < db_count; i++) {
994 block = descriptor_loc(sb, logic_sb_block, i);
995 sbi->s_group_desc[i] = sb_bread(sb, block);
996 if (!sbi->s_group_desc[i]) {
997 for (j = 0; j < i; j++)
998 brelse (sbi->s_group_desc[j]);
999 printk ("EXT2-fs: unable to read group descriptors\n");
1000 goto failed_mount_group_desc;
1001 }
1002 }
1003 if (!ext2_check_descriptors (sb)) {
1004 printk ("EXT2-fs: group descriptors corrupted!\n");
1da177e4
LT		 1005 goto failed_mount2;
1006 }
1007 sbi->s_gdb_count = db_count;
1008 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1009 spin_lock_init(&sbi->s_next_gen_lock);
0216bfcf 1010
a686cd89
MB		 1011 /* per fileystem reservation list head & lock */
1012 spin_lock_init(&sbi->s_rsv_window_lock);
1013 sbi->s_rsv_window_root = RB_ROOT;
1014 /*
1015 * Add a single, static dummy reservation to the start of the
1016 * reservation window list --- it gives us a placeholder for
1017 * append-at-start-of-list which makes the allocation logic
1018 * _much_ simpler.
1019 */
1020 sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
1021 sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
1022 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1023 sbi->s_rsv_window_head.rsv_goal_size = 0;
1024 ext2_rsv_window_add(sb, &sbi->s_rsv_window_head);
1025
833f4077 1026 err = percpu_counter_init(&sbi->s_freeblocks_counter,
0216bfcf 1027 ext2_count_free_blocks(sb));
833f4077
PZ		 1028 if (!err) {
1029 err = percpu_counter_init(&sbi->s_freeinodes_counter,
0216bfcf 1030 ext2_count_free_inodes(sb));
833f4077
PZ		 1031 }
1032 if (!err) {
1033 err = percpu_counter_init(&sbi->s_dirs_counter,
0216bfcf 1034 ext2_count_dirs(sb));
833f4077
PZ		 1035 }
1036 if (err) {
1037 printk(KERN_ERR "EXT2-fs: insufficient memory\n");
1038 goto failed_mount3;
1039 }
1da177e4
LT		 1040 /*
1041 * set up enough so that it can read an inode
1042 */
1043 sb->s_op = &ext2_sops;
1044 sb->s_export_op = &ext2_export_ops;
1045 sb->s_xattr = ext2_xattr_handlers;
52fcf703
DH		 1046 root = ext2_iget(sb, EXT2_ROOT_INO);
1047 if (IS_ERR(root)) {
1048 ret = PTR_ERR(root);
0216bfcf 1049 goto failed_mount3;
1da177e4
LT		 1050 }
1051 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
52fcf703 1052 iput(root);
1da177e4 1053 printk(KERN_ERR "EXT2-fs: corrupt root inode, run e2fsck\n");
0216bfcf 1054 goto failed_mount3;
1da177e4 1055 }
52fcf703
DH		 1056
1057 sb->s_root = d_alloc_root(root);
1058 if (!sb->s_root) {
1059 iput(root);
1060 printk(KERN_ERR "EXT2-fs: get root inode failed\n");
1061 ret = -ENOMEM;
1062 goto failed_mount3;
1063 }
1da177e4
LT		 1064 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL))
1065 ext2_warning(sb, __FUNCTION__,
ec63f22d 1066 "mounting ext3 filesystem as ext2");
1da177e4 1067 ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1da177e4
LT		 1068 return 0;
1069
1070cantfind_ext2:
1071 if (!silent)
1072 printk("VFS: Can't find an ext2 filesystem on dev %s.\n",
1073 sb->s_id);
1074 goto failed_mount;
0216bfcf
MC		 1075failed_mount3:
1076 percpu_counter_destroy(&sbi->s_freeblocks_counter);
1077 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1078 percpu_counter_destroy(&sbi->s_dirs_counter);
1da177e4
LT		 1079failed_mount2:
1080 for (i = 0; i < db_count; i++)
1081 brelse(sbi->s_group_desc[i]);
1082failed_mount_group_desc:
1083 kfree(sbi->s_group_desc);
1084 kfree(sbi->s_debts);
1085failed_mount:
1086 brelse(bh);
1087failed_sbi:
1088 sb->s_fs_info = NULL;
1089 kfree(sbi);
52fcf703 1090 return ret;
1da177e4
LT		 1091}
1092
1093static void ext2_commit_super (struct super_block * sb,
1094 struct ext2_super_block * es)
1095{
1096 es->s_wtime = cpu_to_le32(get_seconds());
1097 mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
1098 sb->s_dirt = 0;
1099}
1100
1101static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es)
1102{
1103 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb));
1104 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb));
1105 es->s_wtime = cpu_to_le32(get_seconds());
1106 mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
1107 sync_dirty_buffer(EXT2_SB(sb)->s_sbh);
1108 sb->s_dirt = 0;
1109}
1110
1111/*
1112 * In the second extended file system, it is not necessary to
1113 * write the super block since we use a mapping of the
1114 * disk super block in a buffer.
1115 *
1116 * However, this function is still used to set the fs valid
1117 * flags to 0. We need to set this flag to 0 since the fs
1118 * may have been checked while mounted and e2fsck may have
1119 * set s_state to EXT2_VALID_FS after some corrections.
1120 */
1121
1122void ext2_write_super (struct super_block * sb)
1123{
1124 struct ext2_super_block * es;
1125 lock_kernel();
1126 if (!(sb->s_flags & MS_RDONLY)) {
1127 es = EXT2_SB(sb)->s_es;
1128
1129 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS) {
1130 ext2_debug ("setting valid to 0\n");
1131 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) &
1132 ~EXT2_VALID_FS);
1133 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb));
1134 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb));
1135 es->s_mtime = cpu_to_le32(get_seconds());
1136 ext2_sync_super(sb, es);
1137 } else
1138 ext2_commit_super (sb, es);
1139 }
1140 sb->s_dirt = 0;
1141 unlock_kernel();
1142}
1143
1144static int ext2_remount (struct super_block * sb, int * flags, char * data)
1145{
1146 struct ext2_sb_info * sbi = EXT2_SB(sb);
1147 struct ext2_super_block * es;
6d79125b 1148 unsigned long old_mount_opt = sbi->s_mount_opt;
50a52234
JK		 1149 struct ext2_mount_options old_opts;
1150 unsigned long old_sb_flags;
1151 int err;
1152
1153 /* Store the old options */
1154 old_sb_flags = sb->s_flags;
1155 old_opts.s_mount_opt = sbi->s_mount_opt;
1156 old_opts.s_resuid = sbi->s_resuid;
1157 old_opts.s_resgid = sbi->s_resgid;
1da177e4
LT		 1158
1159 /*
1160 * Allow the "check" option to be passed as a remount option.
1161 */
50a52234
JK		 1162 if (!parse_options (data, sbi)) {
1163 err = -EINVAL;
1164 goto restore_opts;
1165 }
1da177e4
LT		 1166
1167 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1168 ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1169
266f5aa0
CO		 1170 ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset
1171 EXT2_MOUNT_XIP if not */
1172
1173 if ((ext2_use_xip(sb)) && (sb->s_blocksize != PAGE_SIZE)) {
1174 printk("XIP: Unsupported blocksize\n");
ddc80bd7 1175 err = -EINVAL;
266f5aa0
CO		 1176 goto restore_opts;
1177 }
1178
1da177e4 1179 es = sbi->s_es;
6d79125b
CO		 1180 if (((sbi->s_mount_opt & EXT2_MOUNT_XIP) !=
1181 (old_mount_opt & EXT2_MOUNT_XIP)) &&
1182 invalidate_inodes(sb))
1183 ext2_warning(sb, __FUNCTION__, "busy inodes while remounting "\
1184 "xip remain in cache (no functional problem)");
1da177e4
LT		 1185 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
1186 return 0;
1187 if (*flags & MS_RDONLY) {
1188 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS ||
1189 !(sbi->s_mount_state & EXT2_VALID_FS))
1190 return 0;
1191 /*
1192 * OK, we are remounting a valid rw partition rdonly, so set
1193 * the rdonly flag and then mark the partition as valid again.
1194 */
1195 es->s_state = cpu_to_le16(sbi->s_mount_state);
1196 es->s_mtime = cpu_to_le32(get_seconds());
1197 } else {
1198 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb,
1199 ~EXT2_FEATURE_RO_COMPAT_SUPP);
1200 if (ret) {
1201 printk("EXT2-fs: %s: couldn't remount RDWR because of "
1202 "unsupported optional features (%x).\n",
1203 sb->s_id, le32_to_cpu(ret));
50a52234
JK		 1204 err = -EROFS;
1205 goto restore_opts;
1da177e4
LT		 1206 }
1207 /*
1208 * Mounting a RDONLY partition read-write, so reread and
1209 * store the current valid flag. (It may have been changed
1210 * by e2fsck since we originally mounted the partition.)
1211 */
1212 sbi->s_mount_state = le16_to_cpu(es->s_state);
1213 if (!ext2_setup_super (sb, es, 0))
1214 sb->s_flags &= ~MS_RDONLY;
1215 }
1216 ext2_sync_super(sb, es);
1217 return 0;
50a52234
JK		 1218restore_opts:
1219 sbi->s_mount_opt = old_opts.s_mount_opt;
1220 sbi->s_resuid = old_opts.s_resuid;
1221 sbi->s_resgid = old_opts.s_resgid;
1222 sb->s_flags = old_sb_flags;
1223 return err;
1da177e4
LT		 1224}
1225
726c3342 1226static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf)
1da177e4 1227{
726c3342 1228 struct super_block *sb = dentry->d_sb;
1da177e4 1229 struct ext2_sb_info *sbi = EXT2_SB(sb);
e4fca01e 1230 struct ext2_super_block *es = sbi->s_es;
e4fca01e 1231 u64 fsid;
1da177e4
LT		 1232
1233 if (test_opt (sb, MINIX_DF))
2235219b
BP		 1234 sbi->s_overhead_last = 0;
1235 else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
1236 unsigned long i, overhead = 0;
1237 smp_rmb();
1238
1da177e4 1239 /*
2235219b
BP		 1240 * Compute the overhead (FS structures). This is constant
1241 * for a given filesystem unless the number of block groups
1242 * changes so we cache the previous value until it does.
1da177e4
LT		 1243 */
1244
1245 /*
1246 * All of the blocks before first_data_block are
1247 * overhead
1248 */
e4fca01e 1249 overhead = le32_to_cpu(es->s_first_data_block);
1da177e4
LT		 1250
1251 /*
1252 * Add the overhead attributed to the superblock and
1253 * block group descriptors. If the sparse superblocks
1254 * feature is turned on, then not all groups have this.
1255 */
1256 for (i = 0; i < sbi->s_groups_count; i++)
1257 overhead += ext2_bg_has_super(sb, i) +
1258 ext2_bg_num_gdb(sb, i);
1259
1260 /*
1261 * Every block group has an inode bitmap, a block
1262 * bitmap, and an inode table.
1263 */
1264 overhead += (sbi->s_groups_count *
1265 (2 + sbi->s_itb_per_group));
2235219b
BP		 1266 sbi->s_overhead_last = overhead;
1267 smp_wmb();
1268 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
1da177e4
LT		 1269 }
1270
1271 buf->f_type = EXT2_SUPER_MAGIC;
1272 buf->f_bsize = sb->s_blocksize;
2235219b 1273 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
1da177e4 1274 buf->f_bfree = ext2_count_free_blocks(sb);
2235219b 1275 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
e4fca01e
PE		 1276 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
1277 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
1da177e4 1278 buf->f_bavail = 0;
e4fca01e
PE		 1279 buf->f_files = le32_to_cpu(es->s_inodes_count);
1280 buf->f_ffree = ext2_count_free_inodes(sb);
2235219b 1281 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
1da177e4 1282 buf->f_namelen = EXT2_NAME_LEN;
e4fca01e
PE		 1283 fsid = le64_to_cpup((void *)es->s_uuid) ^
1284 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
1285 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
1286 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
1da177e4
LT		 1287 return 0;
1288}
1289
454e2398
DH		 1290static int ext2_get_sb(struct file_system_type *fs_type,
1291 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1da177e4 1292{
454e2398 1293 return get_sb_bdev(fs_type, flags, dev_name, data, ext2_fill_super, mnt);
1da177e4
LT		 1294}
1295
1296#ifdef CONFIG_QUOTA
1297
1298/* Read data from quotafile - avoid pagecache and such because we cannot afford
1299 * acquiring the locks... As quota files are never truncated and quota code
1300 * itself serializes the operations (and noone else should touch the files)
1301 * we don't have to be afraid of races */
1302static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data,
1303 size_t len, loff_t off)
1304{
1305 struct inode *inode = sb_dqopt(sb)->files[type];
1306 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1307 int err = 0;
1308 int offset = off & (sb->s_blocksize - 1);
1309 int tocopy;
1310 size_t toread;
1311 struct buffer_head tmp_bh;
1312 struct buffer_head *bh;
1313 loff_t i_size = i_size_read(inode);
1314
1315 if (off > i_size)
1316 return 0;
1317 if (off+len > i_size)
1318 len = i_size-off;
1319 toread = len;
1320 while (toread > 0) {
1321 tocopy = sb->s_blocksize - offset < toread ?
1322 sb->s_blocksize - offset : toread;
1323
1324 tmp_bh.b_state = 0;
1325 err = ext2_get_block(inode, blk, &tmp_bh, 0);
a686cd89 1326 if (err < 0)
1da177e4
LT		 1327 return err;
1328 if (!buffer_mapped(&tmp_bh)) /* A hole? */
1329 memset(data, 0, tocopy);
1330 else {
1331 bh = sb_bread(sb, tmp_bh.b_blocknr);
1332 if (!bh)
1333 return -EIO;
1334 memcpy(data, bh->b_data+offset, tocopy);
1335 brelse(bh);
1336 }
1337 offset = 0;
1338 toread -= tocopy;
1339 data += tocopy;
1340 blk++;
1341 }
1342 return len;
1343}
1344
1345/* Write to quotafile */
1346static ssize_t ext2_quota_write(struct super_block *sb, int type,
1347 const char *data, size_t len, loff_t off)
1348{
1349 struct inode *inode = sb_dqopt(sb)->files[type];
1350 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1351 int err = 0;
1352 int offset = off & (sb->s_blocksize - 1);
1353 int tocopy;
1354 size_t towrite = len;
1355 struct buffer_head tmp_bh;
1356 struct buffer_head *bh;
1357
5c81a419 1358 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
1da177e4
LT		 1359 while (towrite > 0) {
1360 tocopy = sb->s_blocksize - offset < towrite ?
1361 sb->s_blocksize - offset : towrite;
1362
1363 tmp_bh.b_state = 0;
1364 err = ext2_get_block(inode, blk, &tmp_bh, 1);
a686cd89 1365 if (err < 0)
1da177e4
LT		 1366 goto out;
1367 if (offset || tocopy != EXT2_BLOCK_SIZE(sb))
1368 bh = sb_bread(sb, tmp_bh.b_blocknr);
1369 else
1370 bh = sb_getblk(sb, tmp_bh.b_blocknr);
1371 if (!bh) {
1372 err = -EIO;
1373 goto out;
1374 }
1375 lock_buffer(bh);
1376 memcpy(bh->b_data+offset, data, tocopy);
1377 flush_dcache_page(bh->b_page);
1378 set_buffer_uptodate(bh);
1379 mark_buffer_dirty(bh);
1380 unlock_buffer(bh);
1381 brelse(bh);
1382 offset = 0;
1383 towrite -= tocopy;
1384 data += tocopy;
1385 blk++;
1386 }
1387out:
1388 if (len == towrite)
1389 return err;
1390 if (inode->i_size < off+len-towrite)
1391 i_size_write(inode, off+len-towrite);
1392 inode->i_version++;
1393 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
1394 mark_inode_dirty(inode);
1b1dcc1b 1395 mutex_unlock(&inode->i_mutex);
1da177e4
LT		 1396 return len - towrite;
1397}
1398
1399#endif
1400
1401static struct file_system_type ext2_fs_type = {
1402 .owner = THIS_MODULE,
1403 .name = "ext2",
1404 .get_sb = ext2_get_sb,
1405 .kill_sb = kill_block_super,
1406 .fs_flags = FS_REQUIRES_DEV,
1407};
1408
1409static int __init init_ext2_fs(void)
1410{
1411 int err = init_ext2_xattr();
1412 if (err)
1413 return err;
1414 err = init_inodecache();
1415 if (err)
1416 goto out1;
1417 err = register_filesystem(&ext2_fs_type);
1418 if (err)
1419 goto out;
1420 return 0;
1421out:
1422 destroy_inodecache();
1423out1:
1424 exit_ext2_xattr();
1425 return err;
1426}
1427
1428static void __exit exit_ext2_fs(void)
1429{
1430 unregister_filesystem(&ext2_fs_type);
1431 destroy_inodecache();
1432 exit_ext2_xattr();
1433}
1434
1435module_init(init_ext2_fs)
1436module_exit(exit_ext2_fs)
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