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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[thirdparty/linux.git] / fs / ext2 / super.c
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 (sbi->s_mount_opt & EXT2_MOUNT_USRQUOTA)
313 seq_puts(seq, ",usrquota");
314
315 if (sbi->s_mount_opt & EXT2_MOUNT_GRPQUOTA)
316 seq_puts(seq, ",grpquota");
317
318 if (sbi->s_mount_opt & EXT2_MOUNT_XIP)
319 seq_puts(seq, ",xip");
320
321 if (sbi->s_mount_opt & EXT2_MOUNT_DAX)
322 seq_puts(seq, ",dax");
323
324 if (!test_opt(sb, RESERVATION))
325 seq_puts(seq, ",noreservation");
326
327 spin_unlock(&sbi->s_lock);
328 return 0;
329 }
330
331 #ifdef CONFIG_QUOTA
332 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off);
333 static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off);
334 static int ext2_quota_on(struct super_block *sb, int type, int format_id,
335 const struct path *path);
336 static struct dquot **ext2_get_dquots(struct inode *inode)
337 {
338 return EXT2_I(inode)->i_dquot;
339 }
340
341 static const struct quotactl_ops ext2_quotactl_ops = {
342 .quota_on = ext2_quota_on,
343 .quota_off = ext2_quota_off,
344 .quota_sync = dquot_quota_sync,
345 .get_state = dquot_get_state,
346 .set_info = dquot_set_dqinfo,
347 .get_dqblk = dquot_get_dqblk,
348 .set_dqblk = dquot_set_dqblk,
349 .get_nextdqblk = dquot_get_next_dqblk,
350 };
351 #endif
352
353 static const struct super_operations ext2_sops = {
354 .alloc_inode = ext2_alloc_inode,
355 .destroy_inode = ext2_destroy_inode,
356 .write_inode = ext2_write_inode,
357 .evict_inode = ext2_evict_inode,
358 .put_super = ext2_put_super,
359 .sync_fs = ext2_sync_fs,
360 .freeze_fs = ext2_freeze,
361 .unfreeze_fs = ext2_unfreeze,
362 .statfs = ext2_statfs,
363 .remount_fs = ext2_remount,
364 .show_options = ext2_show_options,
365 #ifdef CONFIG_QUOTA
366 .quota_read = ext2_quota_read,
367 .quota_write = ext2_quota_write,
368 .get_dquots = ext2_get_dquots,
369 #endif
370 };
371
372 static struct inode *ext2_nfs_get_inode(struct super_block *sb,
373 u64 ino, u32 generation)
374 {
375 struct inode *inode;
376
377 if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO)
378 return ERR_PTR(-ESTALE);
379 if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count))
380 return ERR_PTR(-ESTALE);
381
382 /*
383 * ext2_iget isn't quite right if the inode is currently unallocated!
384 * However ext2_iget currently does appropriate checks to handle stale
385 * inodes so everything is OK.
386 */
387 inode = ext2_iget(sb, ino);
388 if (IS_ERR(inode))
389 return ERR_CAST(inode);
390 if (generation && inode->i_generation != generation) {
391 /* we didn't find the right inode.. */
392 iput(inode);
393 return ERR_PTR(-ESTALE);
394 }
395 return inode;
396 }
397
398 static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid,
399 int fh_len, int fh_type)
400 {
401 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
402 ext2_nfs_get_inode);
403 }
404
405 static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid,
406 int fh_len, int fh_type)
407 {
408 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
409 ext2_nfs_get_inode);
410 }
411
412 static const struct export_operations ext2_export_ops = {
413 .fh_to_dentry = ext2_fh_to_dentry,
414 .fh_to_parent = ext2_fh_to_parent,
415 .get_parent = ext2_get_parent,
416 };
417
418 static unsigned long get_sb_block(void **data)
419 {
420 unsigned long sb_block;
421 char *options = (char *) *data;
422
423 if (!options || strncmp(options, "sb=", 3) != 0)
424 return 1; /* Default location */
425 options += 3;
426 sb_block = simple_strtoul(options, &options, 0);
427 if (*options && *options != ',') {
428 printk("EXT2-fs: Invalid sb specification: %s\n",
429 (char *) *data);
430 return 1;
431 }
432 if (*options == ',')
433 options++;
434 *data = (void *) options;
435 return sb_block;
436 }
437
438 enum {
439 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
440 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic,
441 Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug,
442 Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr,
443 Opt_acl, Opt_noacl, Opt_xip, Opt_dax, Opt_ignore, Opt_err, Opt_quota,
444 Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation
445 };
446
447 static const match_table_t tokens = {
448 {Opt_bsd_df, "bsddf"},
449 {Opt_minix_df, "minixdf"},
450 {Opt_grpid, "grpid"},
451 {Opt_grpid, "bsdgroups"},
452 {Opt_nogrpid, "nogrpid"},
453 {Opt_nogrpid, "sysvgroups"},
454 {Opt_resgid, "resgid=%u"},
455 {Opt_resuid, "resuid=%u"},
456 {Opt_sb, "sb=%u"},
457 {Opt_err_cont, "errors=continue"},
458 {Opt_err_panic, "errors=panic"},
459 {Opt_err_ro, "errors=remount-ro"},
460 {Opt_nouid32, "nouid32"},
461 {Opt_nocheck, "check=none"},
462 {Opt_nocheck, "nocheck"},
463 {Opt_debug, "debug"},
464 {Opt_oldalloc, "oldalloc"},
465 {Opt_orlov, "orlov"},
466 {Opt_nobh, "nobh"},
467 {Opt_user_xattr, "user_xattr"},
468 {Opt_nouser_xattr, "nouser_xattr"},
469 {Opt_acl, "acl"},
470 {Opt_noacl, "noacl"},
471 {Opt_xip, "xip"},
472 {Opt_dax, "dax"},
473 {Opt_grpquota, "grpquota"},
474 {Opt_ignore, "noquota"},
475 {Opt_quota, "quota"},
476 {Opt_usrquota, "usrquota"},
477 {Opt_reservation, "reservation"},
478 {Opt_noreservation, "noreservation"},
479 {Opt_err, NULL}
480 };
481
482 static int parse_options(char *options, struct super_block *sb,
483 struct ext2_mount_options *opts)
484 {
485 char *p;
486 substring_t args[MAX_OPT_ARGS];
487 int option;
488 kuid_t uid;
489 kgid_t gid;
490
491 if (!options)
492 return 1;
493
494 while ((p = strsep (&options, ",")) != NULL) {
495 int token;
496 if (!*p)
497 continue;
498
499 token = match_token(p, tokens, args);
500 switch (token) {
501 case Opt_bsd_df:
502 clear_opt (opts->s_mount_opt, MINIX_DF);
503 break;
504 case Opt_minix_df:
505 set_opt (opts->s_mount_opt, MINIX_DF);
506 break;
507 case Opt_grpid:
508 set_opt (opts->s_mount_opt, GRPID);
509 break;
510 case Opt_nogrpid:
511 clear_opt (opts->s_mount_opt, GRPID);
512 break;
513 case Opt_resuid:
514 if (match_int(&args[0], &option))
515 return 0;
516 uid = make_kuid(current_user_ns(), option);
517 if (!uid_valid(uid)) {
518 ext2_msg(sb, KERN_ERR, "Invalid uid value %d", option);
519 return 0;
520
521 }
522 opts->s_resuid = uid;
523 break;
524 case Opt_resgid:
525 if (match_int(&args[0], &option))
526 return 0;
527 gid = make_kgid(current_user_ns(), option);
528 if (!gid_valid(gid)) {
529 ext2_msg(sb, KERN_ERR, "Invalid gid value %d", option);
530 return 0;
531 }
532 opts->s_resgid = gid;
533 break;
534 case Opt_sb:
535 /* handled by get_sb_block() instead of here */
536 /* *sb_block = match_int(&args[0]); */
537 break;
538 case Opt_err_panic:
539 clear_opt (opts->s_mount_opt, ERRORS_CONT);
540 clear_opt (opts->s_mount_opt, ERRORS_RO);
541 set_opt (opts->s_mount_opt, ERRORS_PANIC);
542 break;
543 case Opt_err_ro:
544 clear_opt (opts->s_mount_opt, ERRORS_CONT);
545 clear_opt (opts->s_mount_opt, ERRORS_PANIC);
546 set_opt (opts->s_mount_opt, ERRORS_RO);
547 break;
548 case Opt_err_cont:
549 clear_opt (opts->s_mount_opt, ERRORS_RO);
550 clear_opt (opts->s_mount_opt, ERRORS_PANIC);
551 set_opt (opts->s_mount_opt, ERRORS_CONT);
552 break;
553 case Opt_nouid32:
554 set_opt (opts->s_mount_opt, NO_UID32);
555 break;
556 case Opt_nocheck:
557 ext2_msg(sb, KERN_WARNING,
558 "Option nocheck/check=none is deprecated and"
559 " will be removed in June 2020.");
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) <=
683 ktime_get_real_seconds()))
684 ext2_msg(sb, KERN_WARNING,
685 "warning: checktime reached, "
686 "running e2fsck is recommended");
687 if (!le16_to_cpu(es->s_max_mnt_count))
688 es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT);
689 le16_add_cpu(&es->s_mnt_count, 1);
690 if (test_opt (sb, DEBUG))
691 ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, fs=%lu, gc=%lu, "
692 "bpg=%lu, ipg=%lu, mo=%04lx]",
693 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize,
694 sbi->s_frag_size,
695 sbi->s_groups_count,
696 EXT2_BLOCKS_PER_GROUP(sb),
697 EXT2_INODES_PER_GROUP(sb),
698 sbi->s_mount_opt);
699 return res;
700 }
701
702 static int ext2_check_descriptors(struct super_block *sb)
703 {
704 int i;
705 struct ext2_sb_info *sbi = EXT2_SB(sb);
706
707 ext2_debug ("Checking group descriptors");
708
709 for (i = 0; i < sbi->s_groups_count; i++) {
710 struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL);
711 ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i);
712 ext2_fsblk_t last_block;
713
714 if (i == sbi->s_groups_count - 1)
715 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
716 else
717 last_block = first_block +
718 (EXT2_BLOCKS_PER_GROUP(sb) - 1);
719
720 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
721 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
722 {
723 ext2_error (sb, "ext2_check_descriptors",
724 "Block bitmap for group %d"
725 " not in group (block %lu)!",
726 i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap));
727 return 0;
728 }
729 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
730 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
731 {
732 ext2_error (sb, "ext2_check_descriptors",
733 "Inode bitmap for group %d"
734 " not in group (block %lu)!",
735 i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap));
736 return 0;
737 }
738 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
739 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
740 last_block)
741 {
742 ext2_error (sb, "ext2_check_descriptors",
743 "Inode table for group %d"
744 " not in group (block %lu)!",
745 i, (unsigned long) le32_to_cpu(gdp->bg_inode_table));
746 return 0;
747 }
748 }
749 return 1;
750 }
751
752 /*
753 * Maximal file size. There is a direct, and {,double-,triple-}indirect
754 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
755 * We need to be 1 filesystem block less than the 2^32 sector limit.
756 */
757 static loff_t ext2_max_size(int bits)
758 {
759 loff_t res = EXT2_NDIR_BLOCKS;
760 int meta_blocks;
761 loff_t upper_limit;
762
763 /* This is calculated to be the largest file size for a
764 * dense, file such that the total number of
765 * sectors in the file, including data and all indirect blocks,
766 * does not exceed 2^32 -1
767 * __u32 i_blocks representing the total number of
768 * 512 bytes blocks of the file
769 */
770 upper_limit = (1LL << 32) - 1;
771
772 /* total blocks in file system block size */
773 upper_limit >>= (bits - 9);
774
775
776 /* indirect blocks */
777 meta_blocks = 1;
778 /* double indirect blocks */
779 meta_blocks += 1 + (1LL << (bits-2));
780 /* tripple indirect blocks */
781 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
782
783 upper_limit -= meta_blocks;
784 upper_limit <<= bits;
785
786 res += 1LL << (bits-2);
787 res += 1LL << (2*(bits-2));
788 res += 1LL << (3*(bits-2));
789 res <<= bits;
790 if (res > upper_limit)
791 res = upper_limit;
792
793 if (res > MAX_LFS_FILESIZE)
794 res = MAX_LFS_FILESIZE;
795
796 return res;
797 }
798
799 static unsigned long descriptor_loc(struct super_block *sb,
800 unsigned long logic_sb_block,
801 int nr)
802 {
803 struct ext2_sb_info *sbi = EXT2_SB(sb);
804 unsigned long bg, first_meta_bg;
805 int has_super = 0;
806
807 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
808
809 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) ||
810 nr < first_meta_bg)
811 return (logic_sb_block + nr + 1);
812 bg = sbi->s_desc_per_block * nr;
813 if (ext2_bg_has_super(sb, bg))
814 has_super = 1;
815
816 return ext2_group_first_block_no(sb, bg) + has_super;
817 }
818
819 static int ext2_fill_super(struct super_block *sb, void *data, int silent)
820 {
821 struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev);
822 struct buffer_head * bh;
823 struct ext2_sb_info * sbi;
824 struct ext2_super_block * es;
825 struct inode *root;
826 unsigned long block;
827 unsigned long sb_block = get_sb_block(&data);
828 unsigned long logic_sb_block;
829 unsigned long offset = 0;
830 unsigned long def_mount_opts;
831 long ret = -ENOMEM;
832 int blocksize = BLOCK_SIZE;
833 int db_count;
834 int i, j;
835 __le32 features;
836 int err;
837 struct ext2_mount_options opts;
838
839 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
840 if (!sbi)
841 goto failed;
842
843 sbi->s_blockgroup_lock =
844 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
845 if (!sbi->s_blockgroup_lock) {
846 kfree(sbi);
847 goto failed;
848 }
849 sb->s_fs_info = sbi;
850 sbi->s_sb_block = sb_block;
851 sbi->s_daxdev = dax_dev;
852
853 spin_lock_init(&sbi->s_lock);
854 ret = -EINVAL;
855
856 /*
857 * See what the current blocksize for the device is, and
858 * use that as the blocksize. Otherwise (or if the blocksize
859 * is smaller than the default) use the default.
860 * This is important for devices that have a hardware
861 * sectorsize that is larger than the default.
862 */
863 blocksize = sb_min_blocksize(sb, BLOCK_SIZE);
864 if (!blocksize) {
865 ext2_msg(sb, KERN_ERR, "error: unable to set blocksize");
866 goto failed_sbi;
867 }
868
869 /*
870 * If the superblock doesn't start on a hardware sector boundary,
871 * calculate the offset.
872 */
873 if (blocksize != BLOCK_SIZE) {
874 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
875 offset = (sb_block*BLOCK_SIZE) % blocksize;
876 } else {
877 logic_sb_block = sb_block;
878 }
879
880 if (!(bh = sb_bread(sb, logic_sb_block))) {
881 ext2_msg(sb, KERN_ERR, "error: unable to read superblock");
882 goto failed_sbi;
883 }
884 /*
885 * Note: s_es must be initialized as soon as possible because
886 * some ext2 macro-instructions depend on its value
887 */
888 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
889 sbi->s_es = es;
890 sb->s_magic = le16_to_cpu(es->s_magic);
891
892 if (sb->s_magic != EXT2_SUPER_MAGIC)
893 goto cantfind_ext2;
894
895 opts.s_mount_opt = 0;
896 /* Set defaults before we parse the mount options */
897 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
898 if (def_mount_opts & EXT2_DEFM_DEBUG)
899 set_opt(opts.s_mount_opt, DEBUG);
900 if (def_mount_opts & EXT2_DEFM_BSDGROUPS)
901 set_opt(opts.s_mount_opt, GRPID);
902 if (def_mount_opts & EXT2_DEFM_UID16)
903 set_opt(opts.s_mount_opt, NO_UID32);
904 #ifdef CONFIG_EXT2_FS_XATTR
905 if (def_mount_opts & EXT2_DEFM_XATTR_USER)
906 set_opt(opts.s_mount_opt, XATTR_USER);
907 #endif
908 #ifdef CONFIG_EXT2_FS_POSIX_ACL
909 if (def_mount_opts & EXT2_DEFM_ACL)
910 set_opt(opts.s_mount_opt, POSIX_ACL);
911 #endif
912
913 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
914 set_opt(opts.s_mount_opt, ERRORS_PANIC);
915 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE)
916 set_opt(opts.s_mount_opt, ERRORS_CONT);
917 else
918 set_opt(opts.s_mount_opt, ERRORS_RO);
919
920 opts.s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
921 opts.s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
922
923 set_opt(opts.s_mount_opt, RESERVATION);
924
925 if (!parse_options((char *) data, sb, &opts))
926 goto failed_mount;
927
928 sbi->s_mount_opt = opts.s_mount_opt;
929 sbi->s_resuid = opts.s_resuid;
930 sbi->s_resgid = opts.s_resgid;
931
932 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
933 ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ?
934 SB_POSIXACL : 0);
935 sb->s_iflags |= SB_I_CGROUPWB;
936
937 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV &&
938 (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) ||
939 EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
940 EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U)))
941 ext2_msg(sb, KERN_WARNING,
942 "warning: feature flags set on rev 0 fs, "
943 "running e2fsck is recommended");
944 /*
945 * Check feature flags regardless of the revision level, since we
946 * previously didn't change the revision level when setting the flags,
947 * so there is a chance incompat flags are set on a rev 0 filesystem.
948 */
949 features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP);
950 if (features) {
951 ext2_msg(sb, KERN_ERR, "error: couldn't mount because of "
952 "unsupported optional features (%x)",
953 le32_to_cpu(features));
954 goto failed_mount;
955 }
956 if (!sb_rdonly(sb) && (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){
957 ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of "
958 "unsupported optional features (%x)",
959 le32_to_cpu(features));
960 goto failed_mount;
961 }
962
963 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
964
965 if (sbi->s_mount_opt & EXT2_MOUNT_DAX) {
966 if (!bdev_dax_supported(sb->s_bdev, blocksize)) {
967 ext2_msg(sb, KERN_ERR,
968 "DAX unsupported by block device. Turning off DAX.");
969 sbi->s_mount_opt &= ~EXT2_MOUNT_DAX;
970 }
971 }
972
973 /* If the blocksize doesn't match, re-read the thing.. */
974 if (sb->s_blocksize != blocksize) {
975 brelse(bh);
976
977 if (!sb_set_blocksize(sb, blocksize)) {
978 ext2_msg(sb, KERN_ERR,
979 "error: bad blocksize %d", blocksize);
980 goto failed_sbi;
981 }
982
983 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
984 offset = (sb_block*BLOCK_SIZE) % blocksize;
985 bh = sb_bread(sb, logic_sb_block);
986 if(!bh) {
987 ext2_msg(sb, KERN_ERR, "error: couldn't read"
988 "superblock on 2nd try");
989 goto failed_sbi;
990 }
991 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
992 sbi->s_es = es;
993 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) {
994 ext2_msg(sb, KERN_ERR, "error: magic mismatch");
995 goto failed_mount;
996 }
997 }
998
999 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits);
1000 sb->s_max_links = EXT2_LINK_MAX;
1001
1002 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) {
1003 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
1004 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
1005 } else {
1006 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1007 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1008 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) ||
1009 !is_power_of_2(sbi->s_inode_size) ||
1010 (sbi->s_inode_size > blocksize)) {
1011 ext2_msg(sb, KERN_ERR,
1012 "error: unsupported inode size: %d",
1013 sbi->s_inode_size);
1014 goto failed_mount;
1015 }
1016 }
1017
1018 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE <<
1019 le32_to_cpu(es->s_log_frag_size);
1020 if (sbi->s_frag_size == 0)
1021 goto cantfind_ext2;
1022 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size;
1023
1024 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1025 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1026 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1027
1028 if (EXT2_INODE_SIZE(sb) == 0)
1029 goto cantfind_ext2;
1030 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb);
1031 if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0)
1032 goto cantfind_ext2;
1033 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1034 sbi->s_inodes_per_block;
1035 sbi->s_desc_per_block = sb->s_blocksize /
1036 sizeof (struct ext2_group_desc);
1037 sbi->s_sbh = bh;
1038 sbi->s_mount_state = le16_to_cpu(es->s_state);
1039 sbi->s_addr_per_block_bits =
1040 ilog2 (EXT2_ADDR_PER_BLOCK(sb));
1041 sbi->s_desc_per_block_bits =
1042 ilog2 (EXT2_DESC_PER_BLOCK(sb));
1043
1044 if (sb->s_magic != EXT2_SUPER_MAGIC)
1045 goto cantfind_ext2;
1046
1047 if (sb->s_blocksize != bh->b_size) {
1048 if (!silent)
1049 ext2_msg(sb, KERN_ERR, "error: unsupported blocksize");
1050 goto failed_mount;
1051 }
1052
1053 if (sb->s_blocksize != sbi->s_frag_size) {
1054 ext2_msg(sb, KERN_ERR,
1055 "error: fragsize %lu != blocksize %lu"
1056 "(not supported yet)",
1057 sbi->s_frag_size, sb->s_blocksize);
1058 goto failed_mount;
1059 }
1060
1061 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) {
1062 ext2_msg(sb, KERN_ERR,
1063 "error: #blocks per group too big: %lu",
1064 sbi->s_blocks_per_group);
1065 goto failed_mount;
1066 }
1067 if (sbi->s_frags_per_group > sb->s_blocksize * 8) {
1068 ext2_msg(sb, KERN_ERR,
1069 "error: #fragments per group too big: %lu",
1070 sbi->s_frags_per_group);
1071 goto failed_mount;
1072 }
1073 if (sbi->s_inodes_per_group > sb->s_blocksize * 8) {
1074 ext2_msg(sb, KERN_ERR,
1075 "error: #inodes per group too big: %lu",
1076 sbi->s_inodes_per_group);
1077 goto failed_mount;
1078 }
1079
1080 if (EXT2_BLOCKS_PER_GROUP(sb) == 0)
1081 goto cantfind_ext2;
1082 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1083 le32_to_cpu(es->s_first_data_block) - 1)
1084 / EXT2_BLOCKS_PER_GROUP(sb)) + 1;
1085 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
1086 EXT2_DESC_PER_BLOCK(sb);
1087 sbi->s_group_desc = kmalloc_array (db_count,
1088 sizeof(struct buffer_head *),
1089 GFP_KERNEL);
1090 if (sbi->s_group_desc == NULL) {
1091 ext2_msg(sb, KERN_ERR, "error: not enough memory");
1092 goto failed_mount;
1093 }
1094 bgl_lock_init(sbi->s_blockgroup_lock);
1095 sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL);
1096 if (!sbi->s_debts) {
1097 ext2_msg(sb, KERN_ERR, "error: not enough memory");
1098 goto failed_mount_group_desc;
1099 }
1100 for (i = 0; i < db_count; i++) {
1101 block = descriptor_loc(sb, logic_sb_block, i);
1102 sbi->s_group_desc[i] = sb_bread(sb, block);
1103 if (!sbi->s_group_desc[i]) {
1104 for (j = 0; j < i; j++)
1105 brelse (sbi->s_group_desc[j]);
1106 ext2_msg(sb, KERN_ERR,
1107 "error: unable to read group descriptors");
1108 goto failed_mount_group_desc;
1109 }
1110 }
1111 if (!ext2_check_descriptors (sb)) {
1112 ext2_msg(sb, KERN_ERR, "group descriptors corrupted");
1113 goto failed_mount2;
1114 }
1115 sbi->s_gdb_count = db_count;
1116 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1117 spin_lock_init(&sbi->s_next_gen_lock);
1118
1119 /* per fileystem reservation list head & lock */
1120 spin_lock_init(&sbi->s_rsv_window_lock);
1121 sbi->s_rsv_window_root = RB_ROOT;
1122 /*
1123 * Add a single, static dummy reservation to the start of the
1124 * reservation window list --- it gives us a placeholder for
1125 * append-at-start-of-list which makes the allocation logic
1126 * _much_ simpler.
1127 */
1128 sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
1129 sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
1130 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1131 sbi->s_rsv_window_head.rsv_goal_size = 0;
1132 ext2_rsv_window_add(sb, &sbi->s_rsv_window_head);
1133
1134 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1135 ext2_count_free_blocks(sb), GFP_KERNEL);
1136 if (!err) {
1137 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1138 ext2_count_free_inodes(sb), GFP_KERNEL);
1139 }
1140 if (!err) {
1141 err = percpu_counter_init(&sbi->s_dirs_counter,
1142 ext2_count_dirs(sb), GFP_KERNEL);
1143 }
1144 if (err) {
1145 ext2_msg(sb, KERN_ERR, "error: insufficient memory");
1146 goto failed_mount3;
1147 }
1148
1149 #ifdef CONFIG_EXT2_FS_XATTR
1150 sbi->s_ea_block_cache = ext2_xattr_create_cache();
1151 if (!sbi->s_ea_block_cache) {
1152 ext2_msg(sb, KERN_ERR, "Failed to create ea_block_cache");
1153 goto failed_mount3;
1154 }
1155 #endif
1156 /*
1157 * set up enough so that it can read an inode
1158 */
1159 sb->s_op = &ext2_sops;
1160 sb->s_export_op = &ext2_export_ops;
1161 sb->s_xattr = ext2_xattr_handlers;
1162
1163 #ifdef CONFIG_QUOTA
1164 sb->dq_op = &dquot_operations;
1165 sb->s_qcop = &ext2_quotactl_ops;
1166 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1167 #endif
1168
1169 root = ext2_iget(sb, EXT2_ROOT_INO);
1170 if (IS_ERR(root)) {
1171 ret = PTR_ERR(root);
1172 goto failed_mount3;
1173 }
1174 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1175 iput(root);
1176 ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
1177 goto failed_mount3;
1178 }
1179
1180 sb->s_root = d_make_root(root);
1181 if (!sb->s_root) {
1182 ext2_msg(sb, KERN_ERR, "error: get root inode failed");
1183 ret = -ENOMEM;
1184 goto failed_mount3;
1185 }
1186 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL))
1187 ext2_msg(sb, KERN_WARNING,
1188 "warning: mounting ext3 filesystem as ext2");
1189 if (ext2_setup_super (sb, es, sb_rdonly(sb)))
1190 sb->s_flags |= SB_RDONLY;
1191 ext2_write_super(sb);
1192 return 0;
1193
1194 cantfind_ext2:
1195 if (!silent)
1196 ext2_msg(sb, KERN_ERR,
1197 "error: can't find an ext2 filesystem on dev %s.",
1198 sb->s_id);
1199 goto failed_mount;
1200 failed_mount3:
1201 if (sbi->s_ea_block_cache)
1202 ext2_xattr_destroy_cache(sbi->s_ea_block_cache);
1203 percpu_counter_destroy(&sbi->s_freeblocks_counter);
1204 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1205 percpu_counter_destroy(&sbi->s_dirs_counter);
1206 failed_mount2:
1207 for (i = 0; i < db_count; i++)
1208 brelse(sbi->s_group_desc[i]);
1209 failed_mount_group_desc:
1210 kfree(sbi->s_group_desc);
1211 kfree(sbi->s_debts);
1212 failed_mount:
1213 brelse(bh);
1214 failed_sbi:
1215 sb->s_fs_info = NULL;
1216 kfree(sbi->s_blockgroup_lock);
1217 kfree(sbi);
1218 failed:
1219 fs_put_dax(dax_dev);
1220 return ret;
1221 }
1222
1223 static void ext2_clear_super_error(struct super_block *sb)
1224 {
1225 struct buffer_head *sbh = EXT2_SB(sb)->s_sbh;
1226
1227 if (buffer_write_io_error(sbh)) {
1228 /*
1229 * Oh, dear. A previous attempt to write the
1230 * superblock failed. This could happen because the
1231 * USB device was yanked out. Or it could happen to
1232 * be a transient write error and maybe the block will
1233 * be remapped. Nothing we can do but to retry the
1234 * write and hope for the best.
1235 */
1236 ext2_msg(sb, KERN_ERR,
1237 "previous I/O error to superblock detected");
1238 clear_buffer_write_io_error(sbh);
1239 set_buffer_uptodate(sbh);
1240 }
1241 }
1242
1243 void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es,
1244 int wait)
1245 {
1246 ext2_clear_super_error(sb);
1247 spin_lock(&EXT2_SB(sb)->s_lock);
1248 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb));
1249 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb));
1250 es->s_wtime = cpu_to_le32(ktime_get_real_seconds());
1251 /* unlock before we do IO */
1252 spin_unlock(&EXT2_SB(sb)->s_lock);
1253 mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
1254 if (wait)
1255 sync_dirty_buffer(EXT2_SB(sb)->s_sbh);
1256 }
1257
1258 /*
1259 * In the second extended file system, it is not necessary to
1260 * write the super block since we use a mapping of the
1261 * disk super block in a buffer.
1262 *
1263 * However, this function is still used to set the fs valid
1264 * flags to 0. We need to set this flag to 0 since the fs
1265 * may have been checked while mounted and e2fsck may have
1266 * set s_state to EXT2_VALID_FS after some corrections.
1267 */
1268 static int ext2_sync_fs(struct super_block *sb, int wait)
1269 {
1270 struct ext2_sb_info *sbi = EXT2_SB(sb);
1271 struct ext2_super_block *es = EXT2_SB(sb)->s_es;
1272
1273 /*
1274 * Write quota structures to quota file, sync_blockdev() will write
1275 * them to disk later
1276 */
1277 dquot_writeback_dquots(sb, -1);
1278
1279 spin_lock(&sbi->s_lock);
1280 if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) {
1281 ext2_debug("setting valid to 0\n");
1282 es->s_state &= cpu_to_le16(~EXT2_VALID_FS);
1283 }
1284 spin_unlock(&sbi->s_lock);
1285 ext2_sync_super(sb, es, wait);
1286 return 0;
1287 }
1288
1289 static int ext2_freeze(struct super_block *sb)
1290 {
1291 struct ext2_sb_info *sbi = EXT2_SB(sb);
1292
1293 /*
1294 * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared
1295 * because we have unattached inodes and thus filesystem is not fully
1296 * consistent.
1297 */
1298 if (atomic_long_read(&sb->s_remove_count)) {
1299 ext2_sync_fs(sb, 1);
1300 return 0;
1301 }
1302 /* Set EXT2_FS_VALID flag */
1303 spin_lock(&sbi->s_lock);
1304 sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state);
1305 spin_unlock(&sbi->s_lock);
1306 ext2_sync_super(sb, sbi->s_es, 1);
1307
1308 return 0;
1309 }
1310
1311 static int ext2_unfreeze(struct super_block *sb)
1312 {
1313 /* Just write sb to clear EXT2_VALID_FS flag */
1314 ext2_write_super(sb);
1315
1316 return 0;
1317 }
1318
1319 static void ext2_write_super(struct super_block *sb)
1320 {
1321 if (!sb_rdonly(sb))
1322 ext2_sync_fs(sb, 1);
1323 }
1324
1325 static int ext2_remount (struct super_block * sb, int * flags, char * data)
1326 {
1327 struct ext2_sb_info * sbi = EXT2_SB(sb);
1328 struct ext2_super_block * es;
1329 struct ext2_mount_options new_opts;
1330 int err;
1331
1332 sync_filesystem(sb);
1333
1334 spin_lock(&sbi->s_lock);
1335 new_opts.s_mount_opt = sbi->s_mount_opt;
1336 new_opts.s_resuid = sbi->s_resuid;
1337 new_opts.s_resgid = sbi->s_resgid;
1338 spin_unlock(&sbi->s_lock);
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(ktime_get_real_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)
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