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cgroup: Limit event generation frequency
[linux/fpc-iii.git] / fs / ext2 / super.c
blobde1694512f1f1503c088960a0b79189054439e0e
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
19 #include <linux/module.h>
20 #include <linux/string.h>
21 #include <linux/fs.h>
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>
28 #include <linux/exportfs.h>
29 #include <linux/vfs.h>
30 #include <linux/seq_file.h>
31 #include <linux/mount.h>
32 #include <linux/log2.h>
33 #include <linux/quotaops.h>
34 #include <linux/uaccess.h>
35 #include <linux/dax.h>
36 #include <linux/iversion.h>
37 #include "ext2.h"
38 #include "xattr.h"
39 #include "acl.h"
40
41 static void ext2_write_super(struct super_block *sb);
42 static int ext2_remount (struct super_block * sb, int * flags, char * data);
43 static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf);
44 static int ext2_sync_fs(struct super_block *sb, int wait);
45 static int ext2_freeze(struct super_block *sb);
46 static int ext2_unfreeze(struct super_block *sb);
47
48 void ext2_error(struct super_block *sb, const char *function,
49 const char *fmt, ...)
50 {
51 struct va_format vaf;
52 va_list args;
53 struct ext2_sb_info *sbi = EXT2_SB(sb);
54 struct ext2_super_block *es = sbi->s_es;
55
56 if (!sb_rdonly(sb)) {
57 spin_lock(&sbi->s_lock);
58 sbi->s_mount_state |= EXT2_ERROR_FS;
59 es->s_state |= cpu_to_le16(EXT2_ERROR_FS);
60 spin_unlock(&sbi->s_lock);
61 ext2_sync_super(sb, es, 1);
62 }
63
64 va_start(args, fmt);
65
66 vaf.fmt = fmt;
67 vaf.va = &args;
68
69 printk(KERN_CRIT "EXT2-fs (%s): error: %s: %pV\n",
70 sb->s_id, function, &vaf);
71
72 va_end(args);
73
74 if (test_opt(sb, ERRORS_PANIC))
75 panic("EXT2-fs: panic from previous error\n");
76 if (test_opt(sb, ERRORS_RO)) {
77 ext2_msg(sb, KERN_CRIT,
78 "error: remounting filesystem read-only");
79 sb->s_flags |= SB_RDONLY;
80 }
81 }
82
83 void ext2_msg(struct super_block *sb, const char *prefix,
84 const char *fmt, ...)
85 {
86 struct va_format vaf;
87 va_list args;
88
89 va_start(args, fmt);
90
91 vaf.fmt = fmt;
92 vaf.va = &args;
93
94 printk("%sEXT2-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
95
96 va_end(args);
97 }
98
99 /*
100 * This must be called with sbi->s_lock held.
101 */
102 void ext2_update_dynamic_rev(struct super_block *sb)
103 {
104 struct ext2_super_block *es = EXT2_SB(sb)->s_es;
105
106 if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV)
107 return;
108
109 ext2_msg(sb, KERN_WARNING,
110 "warning: updating to rev %d because of "
111 "new feature flag, running e2fsck is recommended",
112 EXT2_DYNAMIC_REV);
113
114 es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO);
115 es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE);
116 es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV);
117 /* leave es->s_feature_*compat flags alone */
118 /* es->s_uuid will be set by e2fsck if empty */
119
120 /*
121 * The rest of the superblock fields should be zero, and if not it
122 * means they are likely already in use, so leave them alone. We
123 * can leave it up to e2fsck to clean up any inconsistencies there.
124 */
125 }
126
127 #ifdef CONFIG_QUOTA
128 static int ext2_quota_off(struct super_block *sb, int type);
129
130 static void ext2_quota_off_umount(struct super_block *sb)
131 {
132 int type;
133
134 for (type = 0; type < MAXQUOTAS; type++)
135 ext2_quota_off(sb, type);
136 }
137 #else
138 static inline void ext2_quota_off_umount(struct super_block *sb)
139 {
140 }
141 #endif
142
143 static void ext2_put_super (struct super_block * sb)
144 {
145 int db_count;
146 int i;
147 struct ext2_sb_info *sbi = EXT2_SB(sb);
148
149 ext2_quota_off_umount(sb);
150
151 if (sbi->s_ea_block_cache) {
152 ext2_xattr_destroy_cache(sbi->s_ea_block_cache);
153 sbi->s_ea_block_cache = NULL;
154 }
155 if (!sb_rdonly(sb)) {
156 struct ext2_super_block *es = sbi->s_es;
157
158 spin_lock(&sbi->s_lock);
159 es->s_state = cpu_to_le16(sbi->s_mount_state);
160 spin_unlock(&sbi->s_lock);
161 ext2_sync_super(sb, es, 1);
162 }
163 db_count = sbi->s_gdb_count;
164 for (i = 0; i < db_count; i++)
165 if (sbi->s_group_desc[i])
166 brelse (sbi->s_group_desc[i]);
167 kfree(sbi->s_group_desc);
168 kfree(sbi->s_debts);
169 percpu_counter_destroy(&sbi->s_freeblocks_counter);
170 percpu_counter_destroy(&sbi->s_freeinodes_counter);
171 percpu_counter_destroy(&sbi->s_dirs_counter);
172 brelse (sbi->s_sbh);
173 sb->s_fs_info = NULL;
174 kfree(sbi->s_blockgroup_lock);
175 fs_put_dax(sbi->s_daxdev);
176 kfree(sbi);
177 }
178
179 static struct kmem_cache * ext2_inode_cachep;
180
181 static struct inode *ext2_alloc_inode(struct super_block *sb)
182 {
183 struct ext2_inode_info *ei;
184 ei = kmem_cache_alloc(ext2_inode_cachep, GFP_KERNEL);
185 if (!ei)
186 return NULL;
187 ei->i_block_alloc_info = NULL;
188 inode_set_iversion(&ei->vfs_inode, 1);
189 #ifdef CONFIG_QUOTA
190 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
191 #endif
192
193 return &ei->vfs_inode;
194 }
195
196 static void ext2_i_callback(struct rcu_head *head)
197 {
198 struct inode *inode = container_of(head, struct inode, i_rcu);
199 kmem_cache_free(ext2_inode_cachep, EXT2_I(inode));
200 }
201
202 static void ext2_destroy_inode(struct inode *inode)
203 {
204 call_rcu(&inode->i_rcu, ext2_i_callback);
205 }
206
207 static void init_once(void *foo)
208 {
209 struct ext2_inode_info *ei = (struct ext2_inode_info *) foo;
210
211 rwlock_init(&ei->i_meta_lock);
212 #ifdef CONFIG_EXT2_FS_XATTR
213 init_rwsem(&ei->xattr_sem);
214 #endif
215 mutex_init(&ei->truncate_mutex);
216 #ifdef CONFIG_FS_DAX
217 init_rwsem(&ei->dax_sem);
218 #endif
219 inode_init_once(&ei->vfs_inode);
220 }
221
222 static int __init init_inodecache(void)
223 {
224 ext2_inode_cachep = kmem_cache_create_usercopy("ext2_inode_cache",
225 sizeof(struct ext2_inode_info), 0,
226 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
227 SLAB_ACCOUNT),
228 offsetof(struct ext2_inode_info, i_data),
229 sizeof_field(struct ext2_inode_info, i_data),
230 init_once);
231 if (ext2_inode_cachep == NULL)
232 return -ENOMEM;
233 return 0;
234 }
235
236 static void destroy_inodecache(void)
237 {
238 /*
239 * Make sure all delayed rcu free inodes are flushed before we
240 * destroy cache.
241 */
242 rcu_barrier();
243 kmem_cache_destroy(ext2_inode_cachep);
244 }
245
246 static int ext2_show_options(struct seq_file *seq, struct dentry *root)
247 {
248 struct super_block *sb = root->d_sb;
249 struct ext2_sb_info *sbi = EXT2_SB(sb);
250 struct ext2_super_block *es = sbi->s_es;
251 unsigned long def_mount_opts;
252
253 spin_lock(&sbi->s_lock);
254 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
255
256 if (sbi->s_sb_block != 1)
257 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
258 if (test_opt(sb, MINIX_DF))
259 seq_puts(seq, ",minixdf");
260 if (test_opt(sb, GRPID))
261 seq_puts(seq, ",grpid");
262 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS))
263 seq_puts(seq, ",nogrpid");
264 if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT2_DEF_RESUID)) ||
265 le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) {
266 seq_printf(seq, ",resuid=%u",
267 from_kuid_munged(&init_user_ns, sbi->s_resuid));
268 }
269 if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT2_DEF_RESGID)) ||
270 le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) {
271 seq_printf(seq, ",resgid=%u",
272 from_kgid_munged(&init_user_ns, sbi->s_resgid));
273 }
274 if (test_opt(sb, ERRORS_RO)) {
275 int def_errors = le16_to_cpu(es->s_errors);
276
277 if (def_errors == EXT2_ERRORS_PANIC ||
278 def_errors == EXT2_ERRORS_CONTINUE) {
279 seq_puts(seq, ",errors=remount-ro");
280 }
281 }
282 if (test_opt(sb, ERRORS_CONT))
283 seq_puts(seq, ",errors=continue");
284 if (test_opt(sb, ERRORS_PANIC))
285 seq_puts(seq, ",errors=panic");
286 if (test_opt(sb, NO_UID32))
287 seq_puts(seq, ",nouid32");
288 if (test_opt(sb, DEBUG))
289 seq_puts(seq, ",debug");
290 if (test_opt(sb, OLDALLOC))
291 seq_puts(seq, ",oldalloc");
292
293 #ifdef CONFIG_EXT2_FS_XATTR
294 if (test_opt(sb, XATTR_USER))
295 seq_puts(seq, ",user_xattr");
296 if (!test_opt(sb, XATTR_USER) &&
297 (def_mount_opts & EXT2_DEFM_XATTR_USER)) {
298 seq_puts(seq, ",nouser_xattr");
299 }
300 #endif
301
302 #ifdef CONFIG_EXT2_FS_POSIX_ACL
303 if (test_opt(sb, POSIX_ACL))
304 seq_puts(seq, ",acl");
305 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL))
306 seq_puts(seq, ",noacl");
307 #endif
308
309 if (test_opt(sb, NOBH))
310 seq_puts(seq, ",nobh");
311
312 #if defined(CONFIG_QUOTA)
313 if (sbi->s_mount_opt & EXT2_MOUNT_USRQUOTA)
314 seq_puts(seq, ",usrquota");
315
316 if (sbi->s_mount_opt & EXT2_MOUNT_GRPQUOTA)
317 seq_puts(seq, ",grpquota");
318 #endif
319
320 #ifdef CONFIG_FS_DAX
321 if (sbi->s_mount_opt & EXT2_MOUNT_XIP)
322 seq_puts(seq, ",xip");
323 if (sbi->s_mount_opt & EXT2_MOUNT_DAX)
324 seq_puts(seq, ",dax");
325 #endif
326
327 if (!test_opt(sb, RESERVATION))
328 seq_puts(seq, ",noreservation");
329
330 spin_unlock(&sbi->s_lock);
331 return 0;
332 }
333
334 #ifdef CONFIG_QUOTA
335 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off);
336 static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off);
337 static int ext2_quota_on(struct super_block *sb, int type, int format_id,
338 const struct path *path);
339 static struct dquot **ext2_get_dquots(struct inode *inode)
340 {
341 return EXT2_I(inode)->i_dquot;
342 }
343
344 static const struct quotactl_ops ext2_quotactl_ops = {
345 .quota_on = ext2_quota_on,
346 .quota_off = ext2_quota_off,
347 .quota_sync = dquot_quota_sync,
348 .get_state = dquot_get_state,
349 .set_info = dquot_set_dqinfo,
350 .get_dqblk = dquot_get_dqblk,
351 .set_dqblk = dquot_set_dqblk,
352 .get_nextdqblk = dquot_get_next_dqblk,
353 };
354 #endif
355
356 static const struct super_operations ext2_sops = {
357 .alloc_inode = ext2_alloc_inode,
358 .destroy_inode = ext2_destroy_inode,
359 .write_inode = ext2_write_inode,
360 .evict_inode = ext2_evict_inode,
361 .put_super = ext2_put_super,
362 .sync_fs = ext2_sync_fs,
363 .freeze_fs = ext2_freeze,
364 .unfreeze_fs = ext2_unfreeze,
365 .statfs = ext2_statfs,
366 .remount_fs = ext2_remount,
367 .show_options = ext2_show_options,
368 #ifdef CONFIG_QUOTA
369 .quota_read = ext2_quota_read,
370 .quota_write = ext2_quota_write,
371 .get_dquots = ext2_get_dquots,
372 #endif
373 };
374
375 static struct inode *ext2_nfs_get_inode(struct super_block *sb,
376 u64 ino, u32 generation)
377 {
378 struct inode *inode;
379
380 if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO)
381 return ERR_PTR(-ESTALE);
382 if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count))
383 return ERR_PTR(-ESTALE);
384
385 /*
386 * ext2_iget isn't quite right if the inode is currently unallocated!
387 * However ext2_iget currently does appropriate checks to handle stale
388 * inodes so everything is OK.
389 */
390 inode = ext2_iget(sb, ino);
391 if (IS_ERR(inode))
392 return ERR_CAST(inode);
393 if (generation && inode->i_generation != generation) {
394 /* we didn't find the right inode.. */
395 iput(inode);
396 return ERR_PTR(-ESTALE);
397 }
398 return inode;
399 }
400
401 static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid,
402 int fh_len, int fh_type)
403 {
404 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
405 ext2_nfs_get_inode);
406 }
407
408 static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid,
409 int fh_len, int fh_type)
410 {
411 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
412 ext2_nfs_get_inode);
413 }
414
415 static const struct export_operations ext2_export_ops = {
416 .fh_to_dentry = ext2_fh_to_dentry,
417 .fh_to_parent = ext2_fh_to_parent,
418 .get_parent = ext2_get_parent,
419 };
420
421 static unsigned long get_sb_block(void **data)
422 {
423 unsigned long sb_block;
424 char *options = (char *) *data;
425
426 if (!options || strncmp(options, "sb=", 3) != 0)
427 return 1; /* Default location */
428 options += 3;
429 sb_block = simple_strtoul(options, &options, 0);
430 if (*options && *options != ',') {
431 printk("EXT2-fs: Invalid sb specification: %s\n",
432 (char *) *data);
433 return 1;
434 }
435 if (*options == ',')
436 options++;
437 *data = (void *) options;
438 return sb_block;
439 }
440
441 enum {
442 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
443 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic,
444 Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug,
445 Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr,
446 Opt_acl, Opt_noacl, Opt_xip, Opt_dax, Opt_ignore, Opt_err, Opt_quota,
447 Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation
448 };
449
450 static const match_table_t tokens = {
451 {Opt_bsd_df, "bsddf"},
452 {Opt_minix_df, "minixdf"},
453 {Opt_grpid, "grpid"},
454 {Opt_grpid, "bsdgroups"},
455 {Opt_nogrpid, "nogrpid"},
456 {Opt_nogrpid, "sysvgroups"},
457 {Opt_resgid, "resgid=%u"},
458 {Opt_resuid, "resuid=%u"},
459 {Opt_sb, "sb=%u"},
460 {Opt_err_cont, "errors=continue"},
461 {Opt_err_panic, "errors=panic"},
462 {Opt_err_ro, "errors=remount-ro"},
463 {Opt_nouid32, "nouid32"},
464 {Opt_nocheck, "check=none"},
465 {Opt_nocheck, "nocheck"},
466 {Opt_debug, "debug"},
467 {Opt_oldalloc, "oldalloc"},
468 {Opt_orlov, "orlov"},
469 {Opt_nobh, "nobh"},
470 {Opt_user_xattr, "user_xattr"},
471 {Opt_nouser_xattr, "nouser_xattr"},
472 {Opt_acl, "acl"},
473 {Opt_noacl, "noacl"},
474 {Opt_xip, "xip"},
475 {Opt_dax, "dax"},
476 {Opt_grpquota, "grpquota"},
477 {Opt_ignore, "noquota"},
478 {Opt_quota, "quota"},
479 {Opt_usrquota, "usrquota"},
480 {Opt_reservation, "reservation"},
481 {Opt_noreservation, "noreservation"},
482 {Opt_err, NULL}
483 };
484
485 static int parse_options(char *options, struct super_block *sb,
486 struct ext2_mount_options *opts)
487 {
488 char *p;
489 substring_t args[MAX_OPT_ARGS];
490 int option;
491 kuid_t uid;
492 kgid_t gid;
493
494 if (!options)
495 return 1;
496
497 while ((p = strsep (&options, ",")) != NULL) {
498 int token;
499 if (!*p)
500 continue;
501
502 token = match_token(p, tokens, args);
503 switch (token) {
504 case Opt_bsd_df:
505 clear_opt (opts->s_mount_opt, MINIX_DF);
506 break;
507 case Opt_minix_df:
508 set_opt (opts->s_mount_opt, MINIX_DF);
509 break;
510 case Opt_grpid:
511 set_opt (opts->s_mount_opt, GRPID);
512 break;
513 case Opt_nogrpid:
514 clear_opt (opts->s_mount_opt, GRPID);
515 break;
516 case Opt_resuid:
517 if (match_int(&args[0], &option))
518 return 0;
519 uid = make_kuid(current_user_ns(), option);
520 if (!uid_valid(uid)) {
521 ext2_msg(sb, KERN_ERR, "Invalid uid value %d", option);
522 return 0;
523
524 }
525 opts->s_resuid = uid;
526 break;
527 case Opt_resgid:
528 if (match_int(&args[0], &option))
529 return 0;
530 gid = make_kgid(current_user_ns(), option);
531 if (!gid_valid(gid)) {
532 ext2_msg(sb, KERN_ERR, "Invalid gid value %d", option);
533 return 0;
534 }
535 opts->s_resgid = gid;
536 break;
537 case Opt_sb:
538 /* handled by get_sb_block() instead of here */
539 /* *sb_block = match_int(&args[0]); */
540 break;
541 case Opt_err_panic:
542 clear_opt (opts->s_mount_opt, ERRORS_CONT);
543 clear_opt (opts->s_mount_opt, ERRORS_RO);
544 set_opt (opts->s_mount_opt, ERRORS_PANIC);
545 break;
546 case Opt_err_ro:
547 clear_opt (opts->s_mount_opt, ERRORS_CONT);
548 clear_opt (opts->s_mount_opt, ERRORS_PANIC);
549 set_opt (opts->s_mount_opt, ERRORS_RO);
550 break;
551 case Opt_err_cont:
552 clear_opt (opts->s_mount_opt, ERRORS_RO);
553 clear_opt (opts->s_mount_opt, ERRORS_PANIC);
554 set_opt (opts->s_mount_opt, ERRORS_CONT);
555 break;
556 case Opt_nouid32:
557 set_opt (opts->s_mount_opt, NO_UID32);
558 break;
559 case Opt_nocheck:
560 clear_opt (opts->s_mount_opt, CHECK);
561 break;
562 case Opt_debug:
563 set_opt (opts->s_mount_opt, DEBUG);
564 break;
565 case Opt_oldalloc:
566 set_opt (opts->s_mount_opt, OLDALLOC);
567 break;
568 case Opt_orlov:
569 clear_opt (opts->s_mount_opt, OLDALLOC);
570 break;
571 case Opt_nobh:
572 set_opt (opts->s_mount_opt, NOBH);
573 break;
574 #ifdef CONFIG_EXT2_FS_XATTR
575 case Opt_user_xattr:
576 set_opt (opts->s_mount_opt, XATTR_USER);
577 break;
578 case Opt_nouser_xattr:
579 clear_opt (opts->s_mount_opt, XATTR_USER);
580 break;
581 #else
582 case Opt_user_xattr:
583 case Opt_nouser_xattr:
584 ext2_msg(sb, KERN_INFO, "(no)user_xattr options"
585 "not supported");
586 break;
587 #endif
588 #ifdef CONFIG_EXT2_FS_POSIX_ACL
589 case Opt_acl:
590 set_opt(opts->s_mount_opt, POSIX_ACL);
591 break;
592 case Opt_noacl:
593 clear_opt(opts->s_mount_opt, POSIX_ACL);
594 break;
595 #else
596 case Opt_acl:
597 case Opt_noacl:
598 ext2_msg(sb, KERN_INFO,
599 "(no)acl options not supported");
600 break;
601 #endif
602 case Opt_xip:
603 ext2_msg(sb, KERN_INFO, "use dax instead of xip");
604 set_opt(opts->s_mount_opt, XIP);
605 /* Fall through */
606 case Opt_dax:
607 #ifdef CONFIG_FS_DAX
608 ext2_msg(sb, KERN_WARNING,
609 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
610 set_opt(opts->s_mount_opt, DAX);
611 #else
612 ext2_msg(sb, KERN_INFO, "dax option not supported");
613 #endif
614 break;
615
616 #if defined(CONFIG_QUOTA)
617 case Opt_quota:
618 case Opt_usrquota:
619 set_opt(opts->s_mount_opt, USRQUOTA);
620 break;
621
622 case Opt_grpquota:
623 set_opt(opts->s_mount_opt, GRPQUOTA);
624 break;
625 #else
626 case Opt_quota:
627 case Opt_usrquota:
628 case Opt_grpquota:
629 ext2_msg(sb, KERN_INFO,
630 "quota operations not supported");
631 break;
632 #endif
633
634 case Opt_reservation:
635 set_opt(opts->s_mount_opt, RESERVATION);
636 ext2_msg(sb, KERN_INFO, "reservations ON");
637 break;
638 case Opt_noreservation:
639 clear_opt(opts->s_mount_opt, RESERVATION);
640 ext2_msg(sb, KERN_INFO, "reservations OFF");
641 break;
642 case Opt_ignore:
643 break;
644 default:
645 return 0;
646 }
647 }
648 return 1;
649 }
650
651 static int ext2_setup_super (struct super_block * sb,
652 struct ext2_super_block * es,
653 int read_only)
654 {
655 int res = 0;
656 struct ext2_sb_info *sbi = EXT2_SB(sb);
657
658 if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) {
659 ext2_msg(sb, KERN_ERR,
660 "error: revision level too high, "
661 "forcing read-only mode");
662 res = SB_RDONLY;
663 }
664 if (read_only)
665 return res;
666 if (!(sbi->s_mount_state & EXT2_VALID_FS))
667 ext2_msg(sb, KERN_WARNING,
668 "warning: mounting unchecked fs, "
669 "running e2fsck is recommended");
670 else if ((sbi->s_mount_state & EXT2_ERROR_FS))
671 ext2_msg(sb, KERN_WARNING,
672 "warning: mounting fs with errors, "
673 "running e2fsck is recommended");
674 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
675 le16_to_cpu(es->s_mnt_count) >=
676 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
677 ext2_msg(sb, KERN_WARNING,
678 "warning: maximal mount count reached, "
679 "running e2fsck is recommended");
680 else if (le32_to_cpu(es->s_checkinterval) &&
681 (le32_to_cpu(es->s_lastcheck) +
682 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
683 ext2_msg(sb, KERN_WARNING,
684 "warning: checktime reached, "
685 "running e2fsck is recommended");
686 if (!le16_to_cpu(es->s_max_mnt_count))
687 es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT);
688 le16_add_cpu(&es->s_mnt_count, 1);
689 if (test_opt (sb, DEBUG))
690 ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, fs=%lu, gc=%lu, "
691 "bpg=%lu, ipg=%lu, mo=%04lx]",
692 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize,
693 sbi->s_frag_size,
694 sbi->s_groups_count,
695 EXT2_BLOCKS_PER_GROUP(sb),
696 EXT2_INODES_PER_GROUP(sb),
697 sbi->s_mount_opt);
698 return res;
699 }
700
701 static int ext2_check_descriptors(struct super_block *sb)
702 {
703 int i;
704 struct ext2_sb_info *sbi = EXT2_SB(sb);
705
706 ext2_debug ("Checking group descriptors");
707
708 for (i = 0; i < sbi->s_groups_count; i++) {
709 struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL);
710 ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i);
711 ext2_fsblk_t last_block;
712
713 if (i == sbi->s_groups_count - 1)
714 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
715 else
716 last_block = first_block +
717 (EXT2_BLOCKS_PER_GROUP(sb) - 1);
718
719 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
720 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
721 {
722 ext2_error (sb, "ext2_check_descriptors",
723 "Block bitmap for group %d"
724 " not in group (block %lu)!",
725 i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap));
726 return 0;
727 }
728 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
729 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
730 {
731 ext2_error (sb, "ext2_check_descriptors",
732 "Inode bitmap for group %d"
733 " not in group (block %lu)!",
734 i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap));
735 return 0;
736 }
737 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
738 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
739 last_block)
740 {
741 ext2_error (sb, "ext2_check_descriptors",
742 "Inode table for group %d"
743 " not in group (block %lu)!",
744 i, (unsigned long) le32_to_cpu(gdp->bg_inode_table));
745 return 0;
746 }
747 }
748 return 1;
749 }
750
751 /*
752 * Maximal file size. There is a direct, and {,double-,triple-}indirect
753 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
754 * We need to be 1 filesystem block less than the 2^32 sector limit.
755 */
756 static loff_t ext2_max_size(int bits)
757 {
758 loff_t res = EXT2_NDIR_BLOCKS;
759 int meta_blocks;
760 loff_t upper_limit;
761
762 /* This is calculated to be the largest file size for a
763 * dense, file such that the total number of
764 * sectors in the file, including data and all indirect blocks,
765 * does not exceed 2^32 -1
766 * __u32 i_blocks representing the total number of
767 * 512 bytes blocks of the file
768 */
769 upper_limit = (1LL << 32) - 1;
770
771 /* total blocks in file system block size */
772 upper_limit >>= (bits - 9);
773
774
775 /* indirect blocks */
776 meta_blocks = 1;
777 /* double indirect blocks */
778 meta_blocks += 1 + (1LL << (bits-2));
779 /* tripple indirect blocks */
780 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
781
782 upper_limit -= meta_blocks;
783 upper_limit <<= bits;
784
785 res += 1LL << (bits-2);
786 res += 1LL << (2*(bits-2));
787 res += 1LL << (3*(bits-2));
788 res <<= bits;
789 if (res > upper_limit)
790 res = upper_limit;
791
792 if (res > MAX_LFS_FILESIZE)
793 res = MAX_LFS_FILESIZE;
794
795 return res;
796 }
797
798 static unsigned long descriptor_loc(struct super_block *sb,
799 unsigned long logic_sb_block,
800 int nr)
801 {
802 struct ext2_sb_info *sbi = EXT2_SB(sb);
803 unsigned long bg, first_meta_bg;
804 int has_super = 0;
805
806 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
807
808 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) ||
809 nr < first_meta_bg)
810 return (logic_sb_block + nr + 1);
811 bg = sbi->s_desc_per_block * nr;
812 if (ext2_bg_has_super(sb, bg))
813 has_super = 1;
814
815 return ext2_group_first_block_no(sb, bg) + has_super;
816 }
817
818 static int ext2_fill_super(struct super_block *sb, void *data, int silent)
819 {
820 struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev);
821 struct buffer_head * bh;
822 struct ext2_sb_info * sbi;
823 struct ext2_super_block * es;
824 struct inode *root;
825 unsigned long block;
826 unsigned long sb_block = get_sb_block(&data);
827 unsigned long logic_sb_block;
828 unsigned long offset = 0;
829 unsigned long def_mount_opts;
830 long ret = -ENOMEM;
831 int blocksize = BLOCK_SIZE;
832 int db_count;
833 int i, j;
834 __le32 features;
835 int err;
836 struct ext2_mount_options opts;
837
838 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
839 if (!sbi)
840 goto failed;
841
842 sbi->s_blockgroup_lock =
843 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
844 if (!sbi->s_blockgroup_lock) {
845 kfree(sbi);
846 goto failed;
847 }
848 sb->s_fs_info = sbi;
849 sbi->s_sb_block = sb_block;
850 sbi->s_daxdev = dax_dev;
851
852 spin_lock_init(&sbi->s_lock);
853 ret = -EINVAL;
854
855 /*
856 * See what the current blocksize for the device is, and
857 * use that as the blocksize. Otherwise (or if the blocksize
858 * is smaller than the default) use the default.
859 * This is important for devices that have a hardware
860 * sectorsize that is larger than the default.
861 */
862 blocksize = sb_min_blocksize(sb, BLOCK_SIZE);
863 if (!blocksize) {
864 ext2_msg(sb, KERN_ERR, "error: unable to set blocksize");
865 goto failed_sbi;
866 }
867
868 /*
869 * If the superblock doesn't start on a hardware sector boundary,
870 * calculate the offset.
871 */
872 if (blocksize != BLOCK_SIZE) {
873 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
874 offset = (sb_block*BLOCK_SIZE) % blocksize;
875 } else {
876 logic_sb_block = sb_block;
877 }
878
879 if (!(bh = sb_bread(sb, logic_sb_block))) {
880 ext2_msg(sb, KERN_ERR, "error: unable to read superblock");
881 goto failed_sbi;
882 }
883 /*
884 * Note: s_es must be initialized as soon as possible because
885 * some ext2 macro-instructions depend on its value
886 */
887 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
888 sbi->s_es = es;
889 sb->s_magic = le16_to_cpu(es->s_magic);
890
891 if (sb->s_magic != EXT2_SUPER_MAGIC)
892 goto cantfind_ext2;
893
894 /* Set defaults before we parse the mount options */
895 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
896 if (def_mount_opts & EXT2_DEFM_DEBUG)
897 set_opt(opts.s_mount_opt, DEBUG);
898 if (def_mount_opts & EXT2_DEFM_BSDGROUPS)
899 set_opt(opts.s_mount_opt, GRPID);
900 if (def_mount_opts & EXT2_DEFM_UID16)
901 set_opt(opts.s_mount_opt, NO_UID32);
902 #ifdef CONFIG_EXT2_FS_XATTR
903 if (def_mount_opts & EXT2_DEFM_XATTR_USER)
904 set_opt(opts.s_mount_opt, XATTR_USER);
905 #endif
906 #ifdef CONFIG_EXT2_FS_POSIX_ACL
907 if (def_mount_opts & EXT2_DEFM_ACL)
908 set_opt(opts.s_mount_opt, POSIX_ACL);
909 #endif
910
911 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
912 set_opt(opts.s_mount_opt, ERRORS_PANIC);
913 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE)
914 set_opt(opts.s_mount_opt, ERRORS_CONT);
915 else
916 set_opt(opts.s_mount_opt, ERRORS_RO);
917
918 opts.s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
919 opts.s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
920
921 set_opt(opts.s_mount_opt, RESERVATION);
922
923 if (!parse_options((char *) data, sb, &opts))
924 goto failed_mount;
925
926 sbi->s_mount_opt = opts.s_mount_opt;
927 sbi->s_resuid = opts.s_resuid;
928 sbi->s_resgid = opts.s_resgid;
929
930 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
931 ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ?
932 SB_POSIXACL : 0);
933 sb->s_iflags |= SB_I_CGROUPWB;
934
935 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV &&
936 (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) ||
937 EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
938 EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U)))
939 ext2_msg(sb, KERN_WARNING,
940 "warning: feature flags set on rev 0 fs, "
941 "running e2fsck is recommended");
942 /*
943 * Check feature flags regardless of the revision level, since we
944 * previously didn't change the revision level when setting the flags,
945 * so there is a chance incompat flags are set on a rev 0 filesystem.
946 */
947 features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP);
948 if (features) {
949 ext2_msg(sb, KERN_ERR, "error: couldn't mount because of "
950 "unsupported optional features (%x)",
951 le32_to_cpu(features));
952 goto failed_mount;
953 }
954 if (!sb_rdonly(sb) && (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){
955 ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of "
956 "unsupported optional features (%x)",
957 le32_to_cpu(features));
958 goto failed_mount;
959 }
960
961 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
962
963 if (sbi->s_mount_opt & EXT2_MOUNT_DAX) {
964 err = bdev_dax_supported(sb, blocksize);
965 if (err) {
966 ext2_msg(sb, KERN_ERR,
967 "DAX unsupported by block device. Turning off DAX.");
968 sbi->s_mount_opt &= ~EXT2_MOUNT_DAX;
969 }
970 }
971
972 /* If the blocksize doesn't match, re-read the thing.. */
973 if (sb->s_blocksize != blocksize) {
974 brelse(bh);
975
976 if (!sb_set_blocksize(sb, blocksize)) {
977 ext2_msg(sb, KERN_ERR,
978 "error: bad blocksize %d", blocksize);
979 goto failed_sbi;
980 }
981
982 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
983 offset = (sb_block*BLOCK_SIZE) % blocksize;
984 bh = sb_bread(sb, logic_sb_block);
985 if(!bh) {
986 ext2_msg(sb, KERN_ERR, "error: couldn't read"
987 "superblock on 2nd try");
988 goto failed_sbi;
989 }
990 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
991 sbi->s_es = es;
992 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) {
993 ext2_msg(sb, KERN_ERR, "error: magic mismatch");
994 goto failed_mount;
995 }
996 }
997
998 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits);
999 sb->s_max_links = EXT2_LINK_MAX;
1000
1001 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) {
1002 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
1003 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
1004 } else {
1005 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1006 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1007 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) ||
1008 !is_power_of_2(sbi->s_inode_size) ||
1009 (sbi->s_inode_size > blocksize)) {
1010 ext2_msg(sb, KERN_ERR,
1011 "error: unsupported inode size: %d",
1012 sbi->s_inode_size);
1013 goto failed_mount;
1014 }
1015 }
1016
1017 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE <<
1018 le32_to_cpu(es->s_log_frag_size);
1019 if (sbi->s_frag_size == 0)
1020 goto cantfind_ext2;
1021 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size;
1022
1023 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1024 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1025 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1026
1027 if (EXT2_INODE_SIZE(sb) == 0)
1028 goto cantfind_ext2;
1029 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb);
1030 if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0)
1031 goto cantfind_ext2;
1032 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1033 sbi->s_inodes_per_block;
1034 sbi->s_desc_per_block = sb->s_blocksize /
1035 sizeof (struct ext2_group_desc);
1036 sbi->s_sbh = bh;
1037 sbi->s_mount_state = le16_to_cpu(es->s_state);
1038 sbi->s_addr_per_block_bits =
1039 ilog2 (EXT2_ADDR_PER_BLOCK(sb));
1040 sbi->s_desc_per_block_bits =
1041 ilog2 (EXT2_DESC_PER_BLOCK(sb));
1042
1043 if (sb->s_magic != EXT2_SUPER_MAGIC)
1044 goto cantfind_ext2;
1045
1046 if (sb->s_blocksize != bh->b_size) {
1047 if (!silent)
1048 ext2_msg(sb, KERN_ERR, "error: unsupported blocksize");
1049 goto failed_mount;
1050 }
1051
1052 if (sb->s_blocksize != sbi->s_frag_size) {
1053 ext2_msg(sb, KERN_ERR,
1054 "error: fragsize %lu != blocksize %lu"
1055 "(not supported yet)",
1056 sbi->s_frag_size, sb->s_blocksize);
1057 goto failed_mount;
1058 }
1059
1060 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) {
1061 ext2_msg(sb, KERN_ERR,
1062 "error: #blocks per group too big: %lu",
1063 sbi->s_blocks_per_group);
1064 goto failed_mount;
1065 }
1066 if (sbi->s_frags_per_group > sb->s_blocksize * 8) {
1067 ext2_msg(sb, KERN_ERR,
1068 "error: #fragments per group too big: %lu",
1069 sbi->s_frags_per_group);
1070 goto failed_mount;
1071 }
1072 if (sbi->s_inodes_per_group > sb->s_blocksize * 8) {
1073 ext2_msg(sb, KERN_ERR,
1074 "error: #inodes per group too big: %lu",
1075 sbi->s_inodes_per_group);
1076 goto failed_mount;
1077 }
1078
1079 if (EXT2_BLOCKS_PER_GROUP(sb) == 0)
1080 goto cantfind_ext2;
1081 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1082 le32_to_cpu(es->s_first_data_block) - 1)
1083 / EXT2_BLOCKS_PER_GROUP(sb)) + 1;
1084 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
1085 EXT2_DESC_PER_BLOCK(sb);
1086 sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL);
1087 if (sbi->s_group_desc == NULL) {
1088 ext2_msg(sb, KERN_ERR, "error: not enough memory");
1089 goto failed_mount;
1090 }
1091 bgl_lock_init(sbi->s_blockgroup_lock);
1092 sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL);
1093 if (!sbi->s_debts) {
1094 ext2_msg(sb, KERN_ERR, "error: not enough memory");
1095 goto failed_mount_group_desc;
1096 }
1097 for (i = 0; i < db_count; i++) {
1098 block = descriptor_loc(sb, logic_sb_block, i);
1099 sbi->s_group_desc[i] = sb_bread(sb, block);
1100 if (!sbi->s_group_desc[i]) {
1101 for (j = 0; j < i; j++)
1102 brelse (sbi->s_group_desc[j]);
1103 ext2_msg(sb, KERN_ERR,
1104 "error: unable to read group descriptors");
1105 goto failed_mount_group_desc;
1106 }
1107 }
1108 if (!ext2_check_descriptors (sb)) {
1109 ext2_msg(sb, KERN_ERR, "group descriptors corrupted");
1110 goto failed_mount2;
1111 }
1112 sbi->s_gdb_count = db_count;
1113 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1114 spin_lock_init(&sbi->s_next_gen_lock);
1115
1116 /* per fileystem reservation list head & lock */
1117 spin_lock_init(&sbi->s_rsv_window_lock);
1118 sbi->s_rsv_window_root = RB_ROOT;
1119 /*
1120 * Add a single, static dummy reservation to the start of the
1121 * reservation window list --- it gives us a placeholder for
1122 * append-at-start-of-list which makes the allocation logic
1123 * _much_ simpler.
1124 */
1125 sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
1126 sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
1127 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1128 sbi->s_rsv_window_head.rsv_goal_size = 0;
1129 ext2_rsv_window_add(sb, &sbi->s_rsv_window_head);
1130
1131 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1132 ext2_count_free_blocks(sb), GFP_KERNEL);
1133 if (!err) {
1134 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1135 ext2_count_free_inodes(sb), GFP_KERNEL);
1136 }
1137 if (!err) {
1138 err = percpu_counter_init(&sbi->s_dirs_counter,
1139 ext2_count_dirs(sb), GFP_KERNEL);
1140 }
1141 if (err) {
1142 ext2_msg(sb, KERN_ERR, "error: insufficient memory");
1143 goto failed_mount3;
1144 }
1145
1146 #ifdef CONFIG_EXT2_FS_XATTR
1147 sbi->s_ea_block_cache = ext2_xattr_create_cache();
1148 if (!sbi->s_ea_block_cache) {
1149 ext2_msg(sb, KERN_ERR, "Failed to create ea_block_cache");
1150 goto failed_mount3;
1151 }
1152 #endif
1153 /*
1154 * set up enough so that it can read an inode
1155 */
1156 sb->s_op = &ext2_sops;
1157 sb->s_export_op = &ext2_export_ops;
1158 sb->s_xattr = ext2_xattr_handlers;
1159
1160 #ifdef CONFIG_QUOTA
1161 sb->dq_op = &dquot_operations;
1162 sb->s_qcop = &ext2_quotactl_ops;
1163 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1164 #endif
1165
1166 root = ext2_iget(sb, EXT2_ROOT_INO);
1167 if (IS_ERR(root)) {
1168 ret = PTR_ERR(root);
1169 goto failed_mount3;
1170 }
1171 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1172 iput(root);
1173 ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
1174 goto failed_mount3;
1175 }
1176
1177 sb->s_root = d_make_root(root);
1178 if (!sb->s_root) {
1179 ext2_msg(sb, KERN_ERR, "error: get root inode failed");
1180 ret = -ENOMEM;
1181 goto failed_mount3;
1182 }
1183 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL))
1184 ext2_msg(sb, KERN_WARNING,
1185 "warning: mounting ext3 filesystem as ext2");
1186 if (ext2_setup_super (sb, es, sb_rdonly(sb)))
1187 sb->s_flags |= SB_RDONLY;
1188 ext2_write_super(sb);
1189 return 0;
1190
1191 cantfind_ext2:
1192 if (!silent)
1193 ext2_msg(sb, KERN_ERR,
1194 "error: can't find an ext2 filesystem on dev %s.",
1195 sb->s_id);
1196 goto failed_mount;
1197 failed_mount3:
1198 if (sbi->s_ea_block_cache)
1199 ext2_xattr_destroy_cache(sbi->s_ea_block_cache);
1200 percpu_counter_destroy(&sbi->s_freeblocks_counter);
1201 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1202 percpu_counter_destroy(&sbi->s_dirs_counter);
1203 failed_mount2:
1204 for (i = 0; i < db_count; i++)
1205 brelse(sbi->s_group_desc[i]);
1206 failed_mount_group_desc:
1207 kfree(sbi->s_group_desc);
1208 kfree(sbi->s_debts);
1209 failed_mount:
1210 brelse(bh);
1211 failed_sbi:
1212 sb->s_fs_info = NULL;
1213 kfree(sbi->s_blockgroup_lock);
1214 kfree(sbi);
1215 failed:
1216 fs_put_dax(dax_dev);
1217 return ret;
1218 }
1219
1220 static void ext2_clear_super_error(struct super_block *sb)
1221 {
1222 struct buffer_head *sbh = EXT2_SB(sb)->s_sbh;
1223
1224 if (buffer_write_io_error(sbh)) {
1225 /*
1226 * Oh, dear. A previous attempt to write the
1227 * superblock failed. This could happen because the
1228 * USB device was yanked out. Or it could happen to
1229 * be a transient write error and maybe the block will
1230 * be remapped. Nothing we can do but to retry the
1231 * write and hope for the best.
1232 */
1233 ext2_msg(sb, KERN_ERR,
1234 "previous I/O error to superblock detected");
1235 clear_buffer_write_io_error(sbh);
1236 set_buffer_uptodate(sbh);
1237 }
1238 }
1239
1240 void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es,
1241 int wait)
1242 {
1243 ext2_clear_super_error(sb);
1244 spin_lock(&EXT2_SB(sb)->s_lock);
1245 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb));
1246 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb));
1247 es->s_wtime = cpu_to_le32(get_seconds());
1248 /* unlock before we do IO */
1249 spin_unlock(&EXT2_SB(sb)->s_lock);
1250 mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
1251 if (wait)
1252 sync_dirty_buffer(EXT2_SB(sb)->s_sbh);
1253 }
1254
1255 /*
1256 * In the second extended file system, it is not necessary to
1257 * write the super block since we use a mapping of the
1258 * disk super block in a buffer.
1259 *
1260 * However, this function is still used to set the fs valid
1261 * flags to 0. We need to set this flag to 0 since the fs
1262 * may have been checked while mounted and e2fsck may have
1263 * set s_state to EXT2_VALID_FS after some corrections.
1264 */
1265 static int ext2_sync_fs(struct super_block *sb, int wait)
1266 {
1267 struct ext2_sb_info *sbi = EXT2_SB(sb);
1268 struct ext2_super_block *es = EXT2_SB(sb)->s_es;
1269
1270 /*
1271 * Write quota structures to quota file, sync_blockdev() will write
1272 * them to disk later
1273 */
1274 dquot_writeback_dquots(sb, -1);
1275
1276 spin_lock(&sbi->s_lock);
1277 if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) {
1278 ext2_debug("setting valid to 0\n");
1279 es->s_state &= cpu_to_le16(~EXT2_VALID_FS);
1280 }
1281 spin_unlock(&sbi->s_lock);
1282 ext2_sync_super(sb, es, wait);
1283 return 0;
1284 }
1285
1286 static int ext2_freeze(struct super_block *sb)
1287 {
1288 struct ext2_sb_info *sbi = EXT2_SB(sb);
1289
1290 /*
1291 * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared
1292 * because we have unattached inodes and thus filesystem is not fully
1293 * consistent.
1294 */
1295 if (atomic_long_read(&sb->s_remove_count)) {
1296 ext2_sync_fs(sb, 1);
1297 return 0;
1298 }
1299 /* Set EXT2_FS_VALID flag */
1300 spin_lock(&sbi->s_lock);
1301 sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state);
1302 spin_unlock(&sbi->s_lock);
1303 ext2_sync_super(sb, sbi->s_es, 1);
1304
1305 return 0;
1306 }
1307
1308 static int ext2_unfreeze(struct super_block *sb)
1309 {
1310 /* Just write sb to clear EXT2_VALID_FS flag */
1311 ext2_write_super(sb);
1312
1313 return 0;
1314 }
1315
1316 static void ext2_write_super(struct super_block *sb)
1317 {
1318 if (!sb_rdonly(sb))
1319 ext2_sync_fs(sb, 1);
1320 }
1321
1322 static int ext2_remount (struct super_block * sb, int * flags, char * data)
1323 {
1324 struct ext2_sb_info * sbi = EXT2_SB(sb);
1325 struct ext2_super_block * es;
1326 struct ext2_mount_options new_opts;
1327 int err;
1328
1329 sync_filesystem(sb);
1330
1331 spin_lock(&sbi->s_lock);
1332 new_opts.s_mount_opt = sbi->s_mount_opt;
1333 new_opts.s_resuid = sbi->s_resuid;
1334 new_opts.s_resgid = sbi->s_resgid;
1335 spin_unlock(&sbi->s_lock);
1336
1337 /*
1338 * Allow the "check" option to be passed as a remount option.
1339 */
1340 if (!parse_options(data, sb, &new_opts))
1341 return -EINVAL;
1342
1343 spin_lock(&sbi->s_lock);
1344 es = sbi->s_es;
1345 if ((sbi->s_mount_opt ^ new_opts.s_mount_opt) & EXT2_MOUNT_DAX) {
1346 ext2_msg(sb, KERN_WARNING, "warning: refusing change of "
1347 "dax flag with busy inodes while remounting");
1348 new_opts.s_mount_opt ^= EXT2_MOUNT_DAX;
1349 }
1350 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
1351 goto out_set;
1352 if (*flags & SB_RDONLY) {
1353 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS ||
1354 !(sbi->s_mount_state & EXT2_VALID_FS))
1355 goto out_set;
1356
1357 /*
1358 * OK, we are remounting a valid rw partition rdonly, so set
1359 * the rdonly flag and then mark the partition as valid again.
1360 */
1361 es->s_state = cpu_to_le16(sbi->s_mount_state);
1362 es->s_mtime = cpu_to_le32(get_seconds());
1363 spin_unlock(&sbi->s_lock);
1364
1365 err = dquot_suspend(sb, -1);
1366 if (err < 0)
1367 return err;
1368
1369 ext2_sync_super(sb, es, 1);
1370 } else {
1371 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb,
1372 ~EXT2_FEATURE_RO_COMPAT_SUPP);
1373 if (ret) {
1374 spin_unlock(&sbi->s_lock);
1375 ext2_msg(sb, KERN_WARNING,
1376 "warning: couldn't remount RDWR because of "
1377 "unsupported optional features (%x).",
1378 le32_to_cpu(ret));
1379 return -EROFS;
1380 }
1381 /*
1382 * Mounting a RDONLY partition read-write, so reread and
1383 * store the current valid flag. (It may have been changed
1384 * by e2fsck since we originally mounted the partition.)
1385 */
1386 sbi->s_mount_state = le16_to_cpu(es->s_state);
1387 if (!ext2_setup_super (sb, es, 0))
1388 sb->s_flags &= ~SB_RDONLY;
1389 spin_unlock(&sbi->s_lock);
1390
1391 ext2_write_super(sb);
1392
1393 dquot_resume(sb, -1);
1394 }
1395
1396 spin_lock(&sbi->s_lock);
1397 out_set:
1398 sbi->s_mount_opt = new_opts.s_mount_opt;
1399 sbi->s_resuid = new_opts.s_resuid;
1400 sbi->s_resgid = new_opts.s_resgid;
1401 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
1402 ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? SB_POSIXACL : 0);
1403 spin_unlock(&sbi->s_lock);
1404
1405 return 0;
1406 }
1407
1408 static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf)
1409 {
1410 struct super_block *sb = dentry->d_sb;
1411 struct ext2_sb_info *sbi = EXT2_SB(sb);
1412 struct ext2_super_block *es = sbi->s_es;
1413 u64 fsid;
1414
1415 spin_lock(&sbi->s_lock);
1416
1417 if (test_opt (sb, MINIX_DF))
1418 sbi->s_overhead_last = 0;
1419 else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
1420 unsigned long i, overhead = 0;
1421 smp_rmb();
1422
1423 /*
1424 * Compute the overhead (FS structures). This is constant
1425 * for a given filesystem unless the number of block groups
1426 * changes so we cache the previous value until it does.
1427 */
1428
1429 /*
1430 * All of the blocks before first_data_block are
1431 * overhead
1432 */
1433 overhead = le32_to_cpu(es->s_first_data_block);
1434
1435 /*
1436 * Add the overhead attributed to the superblock and
1437 * block group descriptors. If the sparse superblocks
1438 * feature is turned on, then not all groups have this.
1439 */
1440 for (i = 0; i < sbi->s_groups_count; i++)
1441 overhead += ext2_bg_has_super(sb, i) +
1442 ext2_bg_num_gdb(sb, i);
1443
1444 /*
1445 * Every block group has an inode bitmap, a block
1446 * bitmap, and an inode table.
1447 */
1448 overhead += (sbi->s_groups_count *
1449 (2 + sbi->s_itb_per_group));
1450 sbi->s_overhead_last = overhead;
1451 smp_wmb();
1452 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
1453 }
1454
1455 buf->f_type = EXT2_SUPER_MAGIC;
1456 buf->f_bsize = sb->s_blocksize;
1457 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
1458 buf->f_bfree = ext2_count_free_blocks(sb);
1459 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
1460 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
1461 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
1462 buf->f_bavail = 0;
1463 buf->f_files = le32_to_cpu(es->s_inodes_count);
1464 buf->f_ffree = ext2_count_free_inodes(sb);
1465 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
1466 buf->f_namelen = EXT2_NAME_LEN;
1467 fsid = le64_to_cpup((void *)es->s_uuid) ^
1468 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
1469 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
1470 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
1471 spin_unlock(&sbi->s_lock);
1472 return 0;
1473 }
1474
1475 static struct dentry *ext2_mount(struct file_system_type *fs_type,
1476 int flags, const char *dev_name, void *data)
1477 {
1478 return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super);
1479 }
1480
1481 #ifdef CONFIG_QUOTA
1482
1483 /* Read data from quotafile - avoid pagecache and such because we cannot afford
1484 * acquiring the locks... As quota files are never truncated and quota code
1485 * itself serializes the operations (and no one else should touch the files)
1486 * we don't have to be afraid of races */
1487 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data,
1488 size_t len, loff_t off)
1489 {
1490 struct inode *inode = sb_dqopt(sb)->files[type];
1491 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1492 int err = 0;
1493 int offset = off & (sb->s_blocksize - 1);
1494 int tocopy;
1495 size_t toread;
1496 struct buffer_head tmp_bh;
1497 struct buffer_head *bh;
1498 loff_t i_size = i_size_read(inode);
1499
1500 if (off > i_size)
1501 return 0;
1502 if (off+len > i_size)
1503 len = i_size-off;
1504 toread = len;
1505 while (toread > 0) {
1506 tocopy = sb->s_blocksize - offset < toread ?
1507 sb->s_blocksize - offset : toread;
1508
1509 tmp_bh.b_state = 0;
1510 tmp_bh.b_size = sb->s_blocksize;
1511 err = ext2_get_block(inode, blk, &tmp_bh, 0);
1512 if (err < 0)
1513 return err;
1514 if (!buffer_mapped(&tmp_bh)) /* A hole? */
1515 memset(data, 0, tocopy);
1516 else {
1517 bh = sb_bread(sb, tmp_bh.b_blocknr);
1518 if (!bh)
1519 return -EIO;
1520 memcpy(data, bh->b_data+offset, tocopy);
1521 brelse(bh);
1522 }
1523 offset = 0;
1524 toread -= tocopy;
1525 data += tocopy;
1526 blk++;
1527 }
1528 return len;
1529 }
1530
1531 /* Write to quotafile */
1532 static ssize_t ext2_quota_write(struct super_block *sb, int type,
1533 const char *data, size_t len, loff_t off)
1534 {
1535 struct inode *inode = sb_dqopt(sb)->files[type];
1536 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1537 int err = 0;
1538 int offset = off & (sb->s_blocksize - 1);
1539 int tocopy;
1540 size_t towrite = len;
1541 struct buffer_head tmp_bh;
1542 struct buffer_head *bh;
1543
1544 while (towrite > 0) {
1545 tocopy = sb->s_blocksize - offset < towrite ?
1546 sb->s_blocksize - offset : towrite;
1547
1548 tmp_bh.b_state = 0;
1549 tmp_bh.b_size = sb->s_blocksize;
1550 err = ext2_get_block(inode, blk, &tmp_bh, 1);
1551 if (err < 0)
1552 goto out;
1553 if (offset || tocopy != EXT2_BLOCK_SIZE(sb))
1554 bh = sb_bread(sb, tmp_bh.b_blocknr);
1555 else
1556 bh = sb_getblk(sb, tmp_bh.b_blocknr);
1557 if (unlikely(!bh)) {
1558 err = -EIO;
1559 goto out;
1560 }
1561 lock_buffer(bh);
1562 memcpy(bh->b_data+offset, data, tocopy);
1563 flush_dcache_page(bh->b_page);
1564 set_buffer_uptodate(bh);
1565 mark_buffer_dirty(bh);
1566 unlock_buffer(bh);
1567 brelse(bh);
1568 offset = 0;
1569 towrite -= tocopy;
1570 data += tocopy;
1571 blk++;
1572 }
1573 out:
1574 if (len == towrite)
1575 return err;
1576 if (inode->i_size < off+len-towrite)
1577 i_size_write(inode, off+len-towrite);
1578 inode_inc_iversion(inode);
1579 inode->i_mtime = inode->i_ctime = current_time(inode);
1580 mark_inode_dirty(inode);
1581 return len - towrite;
1582 }
1583
1584 static int ext2_quota_on(struct super_block *sb, int type, int format_id,
1585 const struct path *path)
1586 {
1587 int err;
1588 struct inode *inode;
1589
1590 err = dquot_quota_on(sb, type, format_id, path);
1591 if (err)
1592 return err;
1593
1594 inode = d_inode(path->dentry);
1595 inode_lock(inode);
1596 EXT2_I(inode)->i_flags |= EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL;
1597 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
1598 S_NOATIME | S_IMMUTABLE);
1599 inode_unlock(inode);
1600 mark_inode_dirty(inode);
1601
1602 return 0;
1603 }
1604
1605 static int ext2_quota_off(struct super_block *sb, int type)
1606 {
1607 struct inode *inode = sb_dqopt(sb)->files[type];
1608 int err;
1609
1610 if (!inode || !igrab(inode))
1611 goto out;
1612
1613 err = dquot_quota_off(sb, type);
1614 if (err)
1615 goto out_put;
1616
1617 inode_lock(inode);
1618 EXT2_I(inode)->i_flags &= ~(EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL);
1619 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
1620 inode_unlock(inode);
1621 mark_inode_dirty(inode);
1622 out_put:
1623 iput(inode);
1624 return err;
1625 out:
1626 return dquot_quota_off(sb, type);
1627 }
1628
1629 #endif
1630
1631 static struct file_system_type ext2_fs_type = {
1632 .owner = THIS_MODULE,
1633 .name = "ext2",
1634 .mount = ext2_mount,
1635 .kill_sb = kill_block_super,
1636 .fs_flags = FS_REQUIRES_DEV,
1637 };
1638 MODULE_ALIAS_FS("ext2");
1639
1640 static int __init init_ext2_fs(void)
1641 {
1642 int err;
1643
1644 err = init_inodecache();
1645 if (err)
1646 return err;
1647 err = register_filesystem(&ext2_fs_type);
1648 if (err)
1649 goto out;
1650 return 0;
1651 out:
1652 destroy_inodecache();
1653 return err;
1654 }
1655
1656 static void __exit exit_ext2_fs(void)
1657 {
1658 unregister_filesystem(&ext2_fs_type);
1659 destroy_inodecache();
1660 }
1661
1662 MODULE_AUTHOR("Remy Card and others");
1663 MODULE_DESCRIPTION("Second Extended Filesystem");
1664 MODULE_LICENSE("GPL");
1665 module_init(init_ext2_fs)
1666 module_exit(exit_ext2_fs)
Linux with added FPC-III support