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Merge tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso...
[mirror_ubuntu-jammy-kernel.git] / fs / ext2 / super.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/fs/ext2/super.c
4 *
5 * Copyright (C) 1992, 1993, 1994, 1995
6 * Remy Card (card@masi.ibp.fr)
7 * Laboratoire MASI - Institut Blaise Pascal
8 * Universite Pierre et Marie Curie (Paris VI)
9 *
10 * from
11 *
12 * linux/fs/minix/inode.c
13 *
14 * Copyright (C) 1991, 1992 Linus Torvalds
15 *
16 * Big-endian to little-endian byte-swapping/bitmaps by
17 * David S. Miller (davem@caip.rutgers.edu), 1995
18 */
19
20 #include <linux/module.h>
21 #include <linux/string.h>
22 #include <linux/fs.h>
23 #include <linux/slab.h>
24 #include <linux/init.h>
25 #include <linux/blkdev.h>
26 #include <linux/parser.h>
27 #include <linux/random.h>
28 #include <linux/buffer_head.h>
29 #include <linux/exportfs.h>
30 #include <linux/vfs.h>
31 #include <linux/seq_file.h>
32 #include <linux/mount.h>
33 #include <linux/log2.h>
34 #include <linux/quotaops.h>
35 #include <linux/uaccess.h>
36 #include <linux/dax.h>
37 #include <linux/iversion.h>
38 #include "ext2.h"
39 #include "xattr.h"
40 #include "acl.h"
41
42 static void ext2_write_super(struct super_block *sb);
43 static int ext2_remount (struct super_block * sb, int * flags, char * data);
44 static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf);
45 static int ext2_sync_fs(struct super_block *sb, int wait);
46 static int ext2_freeze(struct super_block *sb);
47 static int ext2_unfreeze(struct super_block *sb);
48
49 void ext2_error(struct super_block *sb, const char *function,
50 const char *fmt, ...)
51 {
52 struct va_format vaf;
53 va_list args;
54 struct ext2_sb_info *sbi = EXT2_SB(sb);
55 struct ext2_super_block *es = sbi->s_es;
56
57 if (!sb_rdonly(sb)) {
58 spin_lock(&sbi->s_lock);
59 sbi->s_mount_state |= EXT2_ERROR_FS;
60 es->s_state |= cpu_to_le16(EXT2_ERROR_FS);
61 spin_unlock(&sbi->s_lock);
62 ext2_sync_super(sb, es, 1);
63 }
64
65 va_start(args, fmt);
66
67 vaf.fmt = fmt;
68 vaf.va = &args;
69
70 printk(KERN_CRIT "EXT2-fs (%s): error: %s: %pV\n",
71 sb->s_id, function, &vaf);
72
73 va_end(args);
74
75 if (test_opt(sb, ERRORS_PANIC))
76 panic("EXT2-fs: panic from previous error\n");
77 if (!sb_rdonly(sb) && test_opt(sb, ERRORS_RO)) {
78 ext2_msg(sb, KERN_CRIT,
79 "error: remounting filesystem read-only");
80 sb->s_flags |= SB_RDONLY;
81 }
82 }
83
84 void ext2_msg(struct super_block *sb, const char *prefix,
85 const char *fmt, ...)
86 {
87 struct va_format vaf;
88 va_list args;
89
90 va_start(args, fmt);
91
92 vaf.fmt = fmt;
93 vaf.va = &args;
94
95 printk("%sEXT2-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
96
97 va_end(args);
98 }
99
100 /*
101 * This must be called with sbi->s_lock held.
102 */
103 void ext2_update_dynamic_rev(struct super_block *sb)
104 {
105 struct ext2_super_block *es = EXT2_SB(sb)->s_es;
106
107 if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV)
108 return;
109
110 ext2_msg(sb, KERN_WARNING,
111 "warning: updating to rev %d because of "
112 "new feature flag, running e2fsck is recommended",
113 EXT2_DYNAMIC_REV);
114
115 es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO);
116 es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE);
117 es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV);
118 /* leave es->s_feature_*compat flags alone */
119 /* es->s_uuid will be set by e2fsck if empty */
120
121 /*
122 * The rest of the superblock fields should be zero, and if not it
123 * means they are likely already in use, so leave them alone. We
124 * can leave it up to e2fsck to clean up any inconsistencies there.
125 */
126 }
127
128 #ifdef CONFIG_QUOTA
129 static int ext2_quota_off(struct super_block *sb, int type);
130
131 static void ext2_quota_off_umount(struct super_block *sb)
132 {
133 int type;
134
135 for (type = 0; type < MAXQUOTAS; type++)
136 ext2_quota_off(sb, type);
137 }
138 #else
139 static inline void ext2_quota_off_umount(struct super_block *sb)
140 {
141 }
142 #endif
143
144 static void ext2_put_super (struct super_block * sb)
145 {
146 int db_count;
147 int i;
148 struct ext2_sb_info *sbi = EXT2_SB(sb);
149
150 ext2_quota_off_umount(sb);
151
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 brelse(sbi->s_group_desc[i]);
166 kfree(sbi->s_group_desc);
167 kfree(sbi->s_debts);
168 percpu_counter_destroy(&sbi->s_freeblocks_counter);
169 percpu_counter_destroy(&sbi->s_freeinodes_counter);
170 percpu_counter_destroy(&sbi->s_dirs_counter);
171 brelse (sbi->s_sbh);
172 sb->s_fs_info = NULL;
173 kfree(sbi->s_blockgroup_lock);
174 fs_put_dax(sbi->s_daxdev);
175 kfree(sbi);
176 }
177
178 static struct kmem_cache * ext2_inode_cachep;
179
180 static struct inode *ext2_alloc_inode(struct super_block *sb)
181 {
182 struct ext2_inode_info *ei;
183 ei = kmem_cache_alloc(ext2_inode_cachep, GFP_KERNEL);
184 if (!ei)
185 return NULL;
186 ei->i_block_alloc_info = NULL;
187 inode_set_iversion(&ei->vfs_inode, 1);
188 #ifdef CONFIG_QUOTA
189 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
190 #endif
191
192 return &ei->vfs_inode;
193 }
194
195 static void ext2_free_in_core_inode(struct inode *inode)
196 {
197 kmem_cache_free(ext2_inode_cachep, EXT2_I(inode));
198 }
199
200 static void init_once(void *foo)
201 {
202 struct ext2_inode_info *ei = (struct ext2_inode_info *) foo;
203
204 rwlock_init(&ei->i_meta_lock);
205 #ifdef CONFIG_EXT2_FS_XATTR
206 init_rwsem(&ei->xattr_sem);
207 #endif
208 mutex_init(&ei->truncate_mutex);
209 inode_init_once(&ei->vfs_inode);
210 }
211
212 static int __init init_inodecache(void)
213 {
214 ext2_inode_cachep = kmem_cache_create_usercopy("ext2_inode_cache",
215 sizeof(struct ext2_inode_info), 0,
216 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
217 SLAB_ACCOUNT),
218 offsetof(struct ext2_inode_info, i_data),
219 sizeof_field(struct ext2_inode_info, i_data),
220 init_once);
221 if (ext2_inode_cachep == NULL)
222 return -ENOMEM;
223 return 0;
224 }
225
226 static void destroy_inodecache(void)
227 {
228 /*
229 * Make sure all delayed rcu free inodes are flushed before we
230 * destroy cache.
231 */
232 rcu_barrier();
233 kmem_cache_destroy(ext2_inode_cachep);
234 }
235
236 static int ext2_show_options(struct seq_file *seq, struct dentry *root)
237 {
238 struct super_block *sb = root->d_sb;
239 struct ext2_sb_info *sbi = EXT2_SB(sb);
240 struct ext2_super_block *es = sbi->s_es;
241 unsigned long def_mount_opts;
242
243 spin_lock(&sbi->s_lock);
244 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
245
246 if (sbi->s_sb_block != 1)
247 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
248 if (test_opt(sb, MINIX_DF))
249 seq_puts(seq, ",minixdf");
250 if (test_opt(sb, GRPID))
251 seq_puts(seq, ",grpid");
252 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS))
253 seq_puts(seq, ",nogrpid");
254 if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT2_DEF_RESUID)) ||
255 le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) {
256 seq_printf(seq, ",resuid=%u",
257 from_kuid_munged(&init_user_ns, sbi->s_resuid));
258 }
259 if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT2_DEF_RESGID)) ||
260 le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) {
261 seq_printf(seq, ",resgid=%u",
262 from_kgid_munged(&init_user_ns, sbi->s_resgid));
263 }
264 if (test_opt(sb, ERRORS_RO)) {
265 int def_errors = le16_to_cpu(es->s_errors);
266
267 if (def_errors == EXT2_ERRORS_PANIC ||
268 def_errors == EXT2_ERRORS_CONTINUE) {
269 seq_puts(seq, ",errors=remount-ro");
270 }
271 }
272 if (test_opt(sb, ERRORS_CONT))
273 seq_puts(seq, ",errors=continue");
274 if (test_opt(sb, ERRORS_PANIC))
275 seq_puts(seq, ",errors=panic");
276 if (test_opt(sb, NO_UID32))
277 seq_puts(seq, ",nouid32");
278 if (test_opt(sb, DEBUG))
279 seq_puts(seq, ",debug");
280 if (test_opt(sb, OLDALLOC))
281 seq_puts(seq, ",oldalloc");
282
283 #ifdef CONFIG_EXT2_FS_XATTR
284 if (test_opt(sb, XATTR_USER))
285 seq_puts(seq, ",user_xattr");
286 if (!test_opt(sb, XATTR_USER) &&
287 (def_mount_opts & EXT2_DEFM_XATTR_USER)) {
288 seq_puts(seq, ",nouser_xattr");
289 }
290 #endif
291
292 #ifdef CONFIG_EXT2_FS_POSIX_ACL
293 if (test_opt(sb, POSIX_ACL))
294 seq_puts(seq, ",acl");
295 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL))
296 seq_puts(seq, ",noacl");
297 #endif
298
299 if (test_opt(sb, NOBH))
300 seq_puts(seq, ",nobh");
301
302 if (test_opt(sb, USRQUOTA))
303 seq_puts(seq, ",usrquota");
304
305 if (test_opt(sb, GRPQUOTA))
306 seq_puts(seq, ",grpquota");
307
308 if (test_opt(sb, XIP))
309 seq_puts(seq, ",xip");
310
311 if (test_opt(sb, DAX))
312 seq_puts(seq, ",dax");
313
314 if (!test_opt(sb, RESERVATION))
315 seq_puts(seq, ",noreservation");
316
317 spin_unlock(&sbi->s_lock);
318 return 0;
319 }
320
321 #ifdef CONFIG_QUOTA
322 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off);
323 static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off);
324 static int ext2_quota_on(struct super_block *sb, int type, int format_id,
325 const struct path *path);
326 static struct dquot **ext2_get_dquots(struct inode *inode)
327 {
328 return EXT2_I(inode)->i_dquot;
329 }
330
331 static const struct quotactl_ops ext2_quotactl_ops = {
332 .quota_on = ext2_quota_on,
333 .quota_off = ext2_quota_off,
334 .quota_sync = dquot_quota_sync,
335 .get_state = dquot_get_state,
336 .set_info = dquot_set_dqinfo,
337 .get_dqblk = dquot_get_dqblk,
338 .set_dqblk = dquot_set_dqblk,
339 .get_nextdqblk = dquot_get_next_dqblk,
340 };
341 #endif
342
343 static const struct super_operations ext2_sops = {
344 .alloc_inode = ext2_alloc_inode,
345 .free_inode = ext2_free_in_core_inode,
346 .write_inode = ext2_write_inode,
347 .evict_inode = ext2_evict_inode,
348 .put_super = ext2_put_super,
349 .sync_fs = ext2_sync_fs,
350 .freeze_fs = ext2_freeze,
351 .unfreeze_fs = ext2_unfreeze,
352 .statfs = ext2_statfs,
353 .remount_fs = ext2_remount,
354 .show_options = ext2_show_options,
355 #ifdef CONFIG_QUOTA
356 .quota_read = ext2_quota_read,
357 .quota_write = ext2_quota_write,
358 .get_dquots = ext2_get_dquots,
359 #endif
360 };
361
362 static struct inode *ext2_nfs_get_inode(struct super_block *sb,
363 u64 ino, u32 generation)
364 {
365 struct inode *inode;
366
367 if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO)
368 return ERR_PTR(-ESTALE);
369 if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count))
370 return ERR_PTR(-ESTALE);
371
372 /*
373 * ext2_iget isn't quite right if the inode is currently unallocated!
374 * However ext2_iget currently does appropriate checks to handle stale
375 * inodes so everything is OK.
376 */
377 inode = ext2_iget(sb, ino);
378 if (IS_ERR(inode))
379 return ERR_CAST(inode);
380 if (generation && inode->i_generation != generation) {
381 /* we didn't find the right inode.. */
382 iput(inode);
383 return ERR_PTR(-ESTALE);
384 }
385 return inode;
386 }
387
388 static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid,
389 int fh_len, int fh_type)
390 {
391 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
392 ext2_nfs_get_inode);
393 }
394
395 static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid,
396 int fh_len, int fh_type)
397 {
398 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
399 ext2_nfs_get_inode);
400 }
401
402 static const struct export_operations ext2_export_ops = {
403 .fh_to_dentry = ext2_fh_to_dentry,
404 .fh_to_parent = ext2_fh_to_parent,
405 .get_parent = ext2_get_parent,
406 };
407
408 static unsigned long get_sb_block(void **data)
409 {
410 unsigned long sb_block;
411 char *options = (char *) *data;
412
413 if (!options || strncmp(options, "sb=", 3) != 0)
414 return 1; /* Default location */
415 options += 3;
416 sb_block = simple_strtoul(options, &options, 0);
417 if (*options && *options != ',') {
418 printk("EXT2-fs: Invalid sb specification: %s\n",
419 (char *) *data);
420 return 1;
421 }
422 if (*options == ',')
423 options++;
424 *data = (void *) options;
425 return sb_block;
426 }
427
428 enum {
429 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
430 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic,
431 Opt_err_ro, Opt_nouid32, Opt_debug,
432 Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr,
433 Opt_acl, Opt_noacl, Opt_xip, Opt_dax, Opt_ignore, Opt_err, Opt_quota,
434 Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation
435 };
436
437 static const match_table_t tokens = {
438 {Opt_bsd_df, "bsddf"},
439 {Opt_minix_df, "minixdf"},
440 {Opt_grpid, "grpid"},
441 {Opt_grpid, "bsdgroups"},
442 {Opt_nogrpid, "nogrpid"},
443 {Opt_nogrpid, "sysvgroups"},
444 {Opt_resgid, "resgid=%u"},
445 {Opt_resuid, "resuid=%u"},
446 {Opt_sb, "sb=%u"},
447 {Opt_err_cont, "errors=continue"},
448 {Opt_err_panic, "errors=panic"},
449 {Opt_err_ro, "errors=remount-ro"},
450 {Opt_nouid32, "nouid32"},
451 {Opt_debug, "debug"},
452 {Opt_oldalloc, "oldalloc"},
453 {Opt_orlov, "orlov"},
454 {Opt_nobh, "nobh"},
455 {Opt_user_xattr, "user_xattr"},
456 {Opt_nouser_xattr, "nouser_xattr"},
457 {Opt_acl, "acl"},
458 {Opt_noacl, "noacl"},
459 {Opt_xip, "xip"},
460 {Opt_dax, "dax"},
461 {Opt_grpquota, "grpquota"},
462 {Opt_ignore, "noquota"},
463 {Opt_quota, "quota"},
464 {Opt_usrquota, "usrquota"},
465 {Opt_reservation, "reservation"},
466 {Opt_noreservation, "noreservation"},
467 {Opt_err, NULL}
468 };
469
470 static int parse_options(char *options, struct super_block *sb,
471 struct ext2_mount_options *opts)
472 {
473 char *p;
474 substring_t args[MAX_OPT_ARGS];
475 int option;
476 kuid_t uid;
477 kgid_t gid;
478
479 if (!options)
480 return 1;
481
482 while ((p = strsep (&options, ",")) != NULL) {
483 int token;
484 if (!*p)
485 continue;
486
487 token = match_token(p, tokens, args);
488 switch (token) {
489 case Opt_bsd_df:
490 clear_opt (opts->s_mount_opt, MINIX_DF);
491 break;
492 case Opt_minix_df:
493 set_opt (opts->s_mount_opt, MINIX_DF);
494 break;
495 case Opt_grpid:
496 set_opt (opts->s_mount_opt, GRPID);
497 break;
498 case Opt_nogrpid:
499 clear_opt (opts->s_mount_opt, GRPID);
500 break;
501 case Opt_resuid:
502 if (match_int(&args[0], &option))
503 return 0;
504 uid = make_kuid(current_user_ns(), option);
505 if (!uid_valid(uid)) {
506 ext2_msg(sb, KERN_ERR, "Invalid uid value %d", option);
507 return 0;
508
509 }
510 opts->s_resuid = uid;
511 break;
512 case Opt_resgid:
513 if (match_int(&args[0], &option))
514 return 0;
515 gid = make_kgid(current_user_ns(), option);
516 if (!gid_valid(gid)) {
517 ext2_msg(sb, KERN_ERR, "Invalid gid value %d", option);
518 return 0;
519 }
520 opts->s_resgid = gid;
521 break;
522 case Opt_sb:
523 /* handled by get_sb_block() instead of here */
524 /* *sb_block = match_int(&args[0]); */
525 break;
526 case Opt_err_panic:
527 clear_opt (opts->s_mount_opt, ERRORS_CONT);
528 clear_opt (opts->s_mount_opt, ERRORS_RO);
529 set_opt (opts->s_mount_opt, ERRORS_PANIC);
530 break;
531 case Opt_err_ro:
532 clear_opt (opts->s_mount_opt, ERRORS_CONT);
533 clear_opt (opts->s_mount_opt, ERRORS_PANIC);
534 set_opt (opts->s_mount_opt, ERRORS_RO);
535 break;
536 case Opt_err_cont:
537 clear_opt (opts->s_mount_opt, ERRORS_RO);
538 clear_opt (opts->s_mount_opt, ERRORS_PANIC);
539 set_opt (opts->s_mount_opt, ERRORS_CONT);
540 break;
541 case Opt_nouid32:
542 set_opt (opts->s_mount_opt, NO_UID32);
543 break;
544 case Opt_debug:
545 set_opt (opts->s_mount_opt, DEBUG);
546 break;
547 case Opt_oldalloc:
548 set_opt (opts->s_mount_opt, OLDALLOC);
549 break;
550 case Opt_orlov:
551 clear_opt (opts->s_mount_opt, OLDALLOC);
552 break;
553 case Opt_nobh:
554 set_opt (opts->s_mount_opt, NOBH);
555 break;
556 #ifdef CONFIG_EXT2_FS_XATTR
557 case Opt_user_xattr:
558 set_opt (opts->s_mount_opt, XATTR_USER);
559 break;
560 case Opt_nouser_xattr:
561 clear_opt (opts->s_mount_opt, XATTR_USER);
562 break;
563 #else
564 case Opt_user_xattr:
565 case Opt_nouser_xattr:
566 ext2_msg(sb, KERN_INFO, "(no)user_xattr options"
567 "not supported");
568 break;
569 #endif
570 #ifdef CONFIG_EXT2_FS_POSIX_ACL
571 case Opt_acl:
572 set_opt(opts->s_mount_opt, POSIX_ACL);
573 break;
574 case Opt_noacl:
575 clear_opt(opts->s_mount_opt, POSIX_ACL);
576 break;
577 #else
578 case Opt_acl:
579 case Opt_noacl:
580 ext2_msg(sb, KERN_INFO,
581 "(no)acl options not supported");
582 break;
583 #endif
584 case Opt_xip:
585 ext2_msg(sb, KERN_INFO, "use dax instead of xip");
586 set_opt(opts->s_mount_opt, XIP);
587 fallthrough;
588 case Opt_dax:
589 #ifdef CONFIG_FS_DAX
590 ext2_msg(sb, KERN_WARNING,
591 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
592 set_opt(opts->s_mount_opt, DAX);
593 #else
594 ext2_msg(sb, KERN_INFO, "dax option not supported");
595 #endif
596 break;
597
598 #if defined(CONFIG_QUOTA)
599 case Opt_quota:
600 case Opt_usrquota:
601 set_opt(opts->s_mount_opt, USRQUOTA);
602 break;
603
604 case Opt_grpquota:
605 set_opt(opts->s_mount_opt, GRPQUOTA);
606 break;
607 #else
608 case Opt_quota:
609 case Opt_usrquota:
610 case Opt_grpquota:
611 ext2_msg(sb, KERN_INFO,
612 "quota operations not supported");
613 break;
614 #endif
615
616 case Opt_reservation:
617 set_opt(opts->s_mount_opt, RESERVATION);
618 ext2_msg(sb, KERN_INFO, "reservations ON");
619 break;
620 case Opt_noreservation:
621 clear_opt(opts->s_mount_opt, RESERVATION);
622 ext2_msg(sb, KERN_INFO, "reservations OFF");
623 break;
624 case Opt_ignore:
625 break;
626 default:
627 return 0;
628 }
629 }
630 return 1;
631 }
632
633 static int ext2_setup_super (struct super_block * sb,
634 struct ext2_super_block * es,
635 int read_only)
636 {
637 int res = 0;
638 struct ext2_sb_info *sbi = EXT2_SB(sb);
639
640 if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) {
641 ext2_msg(sb, KERN_ERR,
642 "error: revision level too high, "
643 "forcing read-only mode");
644 res = SB_RDONLY;
645 }
646 if (read_only)
647 return res;
648 if (!(sbi->s_mount_state & EXT2_VALID_FS))
649 ext2_msg(sb, KERN_WARNING,
650 "warning: mounting unchecked fs, "
651 "running e2fsck is recommended");
652 else if ((sbi->s_mount_state & EXT2_ERROR_FS))
653 ext2_msg(sb, KERN_WARNING,
654 "warning: mounting fs with errors, "
655 "running e2fsck is recommended");
656 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
657 le16_to_cpu(es->s_mnt_count) >=
658 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
659 ext2_msg(sb, KERN_WARNING,
660 "warning: maximal mount count reached, "
661 "running e2fsck is recommended");
662 else if (le32_to_cpu(es->s_checkinterval) &&
663 (le32_to_cpu(es->s_lastcheck) +
664 le32_to_cpu(es->s_checkinterval) <=
665 ktime_get_real_seconds()))
666 ext2_msg(sb, KERN_WARNING,
667 "warning: checktime reached, "
668 "running e2fsck is recommended");
669 if (!le16_to_cpu(es->s_max_mnt_count))
670 es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT);
671 le16_add_cpu(&es->s_mnt_count, 1);
672 if (test_opt (sb, DEBUG))
673 ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, fs=%lu, gc=%lu, "
674 "bpg=%lu, ipg=%lu, mo=%04lx]",
675 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize,
676 sbi->s_frag_size,
677 sbi->s_groups_count,
678 EXT2_BLOCKS_PER_GROUP(sb),
679 EXT2_INODES_PER_GROUP(sb),
680 sbi->s_mount_opt);
681 return res;
682 }
683
684 static int ext2_check_descriptors(struct super_block *sb)
685 {
686 int i;
687 struct ext2_sb_info *sbi = EXT2_SB(sb);
688
689 ext2_debug ("Checking group descriptors");
690
691 for (i = 0; i < sbi->s_groups_count; i++) {
692 struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL);
693 ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i);
694 ext2_fsblk_t last_block = ext2_group_last_block_no(sb, i);
695
696 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
697 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
698 {
699 ext2_error (sb, "ext2_check_descriptors",
700 "Block bitmap for group %d"
701 " not in group (block %lu)!",
702 i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap));
703 return 0;
704 }
705 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
706 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
707 {
708 ext2_error (sb, "ext2_check_descriptors",
709 "Inode bitmap for group %d"
710 " not in group (block %lu)!",
711 i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap));
712 return 0;
713 }
714 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
715 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
716 last_block)
717 {
718 ext2_error (sb, "ext2_check_descriptors",
719 "Inode table for group %d"
720 " not in group (block %lu)!",
721 i, (unsigned long) le32_to_cpu(gdp->bg_inode_table));
722 return 0;
723 }
724 }
725 return 1;
726 }
727
728 /*
729 * Maximal file size. There is a direct, and {,double-,triple-}indirect
730 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
731 * We need to be 1 filesystem block less than the 2^32 sector limit.
732 */
733 static loff_t ext2_max_size(int bits)
734 {
735 loff_t res = EXT2_NDIR_BLOCKS;
736 int meta_blocks;
737 unsigned int upper_limit;
738 unsigned int ppb = 1 << (bits-2);
739
740 /* This is calculated to be the largest file size for a
741 * dense, file such that the total number of
742 * sectors in the file, including data and all indirect blocks,
743 * does not exceed 2^32 -1
744 * __u32 i_blocks representing the total number of
745 * 512 bytes blocks of the file
746 */
747 upper_limit = (1LL << 32) - 1;
748
749 /* total blocks in file system block size */
750 upper_limit >>= (bits - 9);
751
752 /* Compute how many blocks we can address by block tree */
753 res += 1LL << (bits-2);
754 res += 1LL << (2*(bits-2));
755 res += 1LL << (3*(bits-2));
756 /* Does block tree limit file size? */
757 if (res < upper_limit)
758 goto check_lfs;
759
760 res = upper_limit;
761 /* How many metadata blocks are needed for addressing upper_limit? */
762 upper_limit -= EXT2_NDIR_BLOCKS;
763 /* indirect blocks */
764 meta_blocks = 1;
765 upper_limit -= ppb;
766 /* double indirect blocks */
767 if (upper_limit < ppb * ppb) {
768 meta_blocks += 1 + DIV_ROUND_UP(upper_limit, ppb);
769 res -= meta_blocks;
770 goto check_lfs;
771 }
772 meta_blocks += 1 + ppb;
773 upper_limit -= ppb * ppb;
774 /* tripple indirect blocks for the rest */
775 meta_blocks += 1 + DIV_ROUND_UP(upper_limit, ppb) +
776 DIV_ROUND_UP(upper_limit, ppb*ppb);
777 res -= meta_blocks;
778 check_lfs:
779 res <<= bits;
780 if (res > MAX_LFS_FILESIZE)
781 res = MAX_LFS_FILESIZE;
782
783 return res;
784 }
785
786 static unsigned long descriptor_loc(struct super_block *sb,
787 unsigned long logic_sb_block,
788 int nr)
789 {
790 struct ext2_sb_info *sbi = EXT2_SB(sb);
791 unsigned long bg, first_meta_bg;
792
793 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
794
795 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) ||
796 nr < first_meta_bg)
797 return (logic_sb_block + nr + 1);
798 bg = sbi->s_desc_per_block * nr;
799
800 return ext2_group_first_block_no(sb, bg) + ext2_bg_has_super(sb, bg);
801 }
802
803 static int ext2_fill_super(struct super_block *sb, void *data, int silent)
804 {
805 struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev);
806 struct buffer_head * bh;
807 struct ext2_sb_info * sbi;
808 struct ext2_super_block * es;
809 struct inode *root;
810 unsigned long block;
811 unsigned long sb_block = get_sb_block(&data);
812 unsigned long logic_sb_block;
813 unsigned long offset = 0;
814 unsigned long def_mount_opts;
815 long ret = -ENOMEM;
816 int blocksize = BLOCK_SIZE;
817 int db_count;
818 int i, j;
819 __le32 features;
820 int err;
821 struct ext2_mount_options opts;
822
823 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
824 if (!sbi)
825 goto failed;
826
827 sbi->s_blockgroup_lock =
828 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
829 if (!sbi->s_blockgroup_lock) {
830 kfree(sbi);
831 goto failed;
832 }
833 sb->s_fs_info = sbi;
834 sbi->s_sb_block = sb_block;
835 sbi->s_daxdev = dax_dev;
836
837 spin_lock_init(&sbi->s_lock);
838 ret = -EINVAL;
839
840 /*
841 * See what the current blocksize for the device is, and
842 * use that as the blocksize. Otherwise (or if the blocksize
843 * is smaller than the default) use the default.
844 * This is important for devices that have a hardware
845 * sectorsize that is larger than the default.
846 */
847 blocksize = sb_min_blocksize(sb, BLOCK_SIZE);
848 if (!blocksize) {
849 ext2_msg(sb, KERN_ERR, "error: unable to set blocksize");
850 goto failed_sbi;
851 }
852
853 /*
854 * If the superblock doesn't start on a hardware sector boundary,
855 * calculate the offset.
856 */
857 if (blocksize != BLOCK_SIZE) {
858 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
859 offset = (sb_block*BLOCK_SIZE) % blocksize;
860 } else {
861 logic_sb_block = sb_block;
862 }
863
864 if (!(bh = sb_bread(sb, logic_sb_block))) {
865 ext2_msg(sb, KERN_ERR, "error: unable to read superblock");
866 goto failed_sbi;
867 }
868 /*
869 * Note: s_es must be initialized as soon as possible because
870 * some ext2 macro-instructions depend on its value
871 */
872 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
873 sbi->s_es = es;
874 sb->s_magic = le16_to_cpu(es->s_magic);
875
876 if (sb->s_magic != EXT2_SUPER_MAGIC)
877 goto cantfind_ext2;
878
879 opts.s_mount_opt = 0;
880 /* Set defaults before we parse the mount options */
881 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
882 if (def_mount_opts & EXT2_DEFM_DEBUG)
883 set_opt(opts.s_mount_opt, DEBUG);
884 if (def_mount_opts & EXT2_DEFM_BSDGROUPS)
885 set_opt(opts.s_mount_opt, GRPID);
886 if (def_mount_opts & EXT2_DEFM_UID16)
887 set_opt(opts.s_mount_opt, NO_UID32);
888 #ifdef CONFIG_EXT2_FS_XATTR
889 if (def_mount_opts & EXT2_DEFM_XATTR_USER)
890 set_opt(opts.s_mount_opt, XATTR_USER);
891 #endif
892 #ifdef CONFIG_EXT2_FS_POSIX_ACL
893 if (def_mount_opts & EXT2_DEFM_ACL)
894 set_opt(opts.s_mount_opt, POSIX_ACL);
895 #endif
896
897 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
898 set_opt(opts.s_mount_opt, ERRORS_PANIC);
899 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE)
900 set_opt(opts.s_mount_opt, ERRORS_CONT);
901 else
902 set_opt(opts.s_mount_opt, ERRORS_RO);
903
904 opts.s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
905 opts.s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
906
907 set_opt(opts.s_mount_opt, RESERVATION);
908
909 if (!parse_options((char *) data, sb, &opts))
910 goto failed_mount;
911
912 sbi->s_mount_opt = opts.s_mount_opt;
913 sbi->s_resuid = opts.s_resuid;
914 sbi->s_resgid = opts.s_resgid;
915
916 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
917 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
918 sb->s_iflags |= SB_I_CGROUPWB;
919
920 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV &&
921 (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) ||
922 EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
923 EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U)))
924 ext2_msg(sb, KERN_WARNING,
925 "warning: feature flags set on rev 0 fs, "
926 "running e2fsck is recommended");
927 /*
928 * Check feature flags regardless of the revision level, since we
929 * previously didn't change the revision level when setting the flags,
930 * so there is a chance incompat flags are set on a rev 0 filesystem.
931 */
932 features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP);
933 if (features) {
934 ext2_msg(sb, KERN_ERR, "error: couldn't mount because of "
935 "unsupported optional features (%x)",
936 le32_to_cpu(features));
937 goto failed_mount;
938 }
939 if (!sb_rdonly(sb) && (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){
940 ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of "
941 "unsupported optional features (%x)",
942 le32_to_cpu(features));
943 goto failed_mount;
944 }
945
946 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
947
948 if (test_opt(sb, DAX)) {
949 if (!bdev_dax_supported(sb->s_bdev, blocksize)) {
950 ext2_msg(sb, KERN_ERR,
951 "DAX unsupported by block device. Turning off DAX.");
952 clear_opt(sbi->s_mount_opt, DAX);
953 }
954 }
955
956 /* If the blocksize doesn't match, re-read the thing.. */
957 if (sb->s_blocksize != blocksize) {
958 brelse(bh);
959
960 if (!sb_set_blocksize(sb, blocksize)) {
961 ext2_msg(sb, KERN_ERR,
962 "error: bad blocksize %d", blocksize);
963 goto failed_sbi;
964 }
965
966 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
967 offset = (sb_block*BLOCK_SIZE) % blocksize;
968 bh = sb_bread(sb, logic_sb_block);
969 if(!bh) {
970 ext2_msg(sb, KERN_ERR, "error: couldn't read"
971 "superblock on 2nd try");
972 goto failed_sbi;
973 }
974 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
975 sbi->s_es = es;
976 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) {
977 ext2_msg(sb, KERN_ERR, "error: magic mismatch");
978 goto failed_mount;
979 }
980 }
981
982 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits);
983 sb->s_max_links = EXT2_LINK_MAX;
984 sb->s_time_min = S32_MIN;
985 sb->s_time_max = S32_MAX;
986
987 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) {
988 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
989 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
990 } else {
991 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
992 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
993 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) ||
994 !is_power_of_2(sbi->s_inode_size) ||
995 (sbi->s_inode_size > blocksize)) {
996 ext2_msg(sb, KERN_ERR,
997 "error: unsupported inode size: %d",
998 sbi->s_inode_size);
999 goto failed_mount;
1000 }
1001 }
1002
1003 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE <<
1004 le32_to_cpu(es->s_log_frag_size);
1005 if (sbi->s_frag_size == 0)
1006 goto cantfind_ext2;
1007 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size;
1008
1009 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1010 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1011 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1012
1013 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb);
1014 if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0)
1015 goto cantfind_ext2;
1016 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1017 sbi->s_inodes_per_block;
1018 sbi->s_desc_per_block = sb->s_blocksize /
1019 sizeof (struct ext2_group_desc);
1020 sbi->s_sbh = bh;
1021 sbi->s_mount_state = le16_to_cpu(es->s_state);
1022 sbi->s_addr_per_block_bits =
1023 ilog2 (EXT2_ADDR_PER_BLOCK(sb));
1024 sbi->s_desc_per_block_bits =
1025 ilog2 (EXT2_DESC_PER_BLOCK(sb));
1026
1027 if (sb->s_magic != EXT2_SUPER_MAGIC)
1028 goto cantfind_ext2;
1029
1030 if (sb->s_blocksize != bh->b_size) {
1031 if (!silent)
1032 ext2_msg(sb, KERN_ERR, "error: unsupported blocksize");
1033 goto failed_mount;
1034 }
1035
1036 if (sb->s_blocksize != sbi->s_frag_size) {
1037 ext2_msg(sb, KERN_ERR,
1038 "error: fragsize %lu != blocksize %lu"
1039 "(not supported yet)",
1040 sbi->s_frag_size, sb->s_blocksize);
1041 goto failed_mount;
1042 }
1043
1044 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) {
1045 ext2_msg(sb, KERN_ERR,
1046 "error: #blocks per group too big: %lu",
1047 sbi->s_blocks_per_group);
1048 goto failed_mount;
1049 }
1050 if (sbi->s_frags_per_group > sb->s_blocksize * 8) {
1051 ext2_msg(sb, KERN_ERR,
1052 "error: #fragments per group too big: %lu",
1053 sbi->s_frags_per_group);
1054 goto failed_mount;
1055 }
1056 if (sbi->s_inodes_per_group > sb->s_blocksize * 8) {
1057 ext2_msg(sb, KERN_ERR,
1058 "error: #inodes per group too big: %lu",
1059 sbi->s_inodes_per_group);
1060 goto failed_mount;
1061 }
1062
1063 if (EXT2_BLOCKS_PER_GROUP(sb) == 0)
1064 goto cantfind_ext2;
1065 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1066 le32_to_cpu(es->s_first_data_block) - 1)
1067 / EXT2_BLOCKS_PER_GROUP(sb)) + 1;
1068 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
1069 EXT2_DESC_PER_BLOCK(sb);
1070 sbi->s_group_desc = kmalloc_array(db_count,
1071 sizeof(struct buffer_head *),
1072 GFP_KERNEL);
1073 if (sbi->s_group_desc == NULL) {
1074 ret = -ENOMEM;
1075 ext2_msg(sb, KERN_ERR, "error: not enough memory");
1076 goto failed_mount;
1077 }
1078 bgl_lock_init(sbi->s_blockgroup_lock);
1079 sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL);
1080 if (!sbi->s_debts) {
1081 ret = -ENOMEM;
1082 ext2_msg(sb, KERN_ERR, "error: not enough memory");
1083 goto failed_mount_group_desc;
1084 }
1085 for (i = 0; i < db_count; i++) {
1086 block = descriptor_loc(sb, logic_sb_block, i);
1087 sbi->s_group_desc[i] = sb_bread(sb, block);
1088 if (!sbi->s_group_desc[i]) {
1089 for (j = 0; j < i; j++)
1090 brelse (sbi->s_group_desc[j]);
1091 ext2_msg(sb, KERN_ERR,
1092 "error: unable to read group descriptors");
1093 goto failed_mount_group_desc;
1094 }
1095 }
1096 if (!ext2_check_descriptors (sb)) {
1097 ext2_msg(sb, KERN_ERR, "group descriptors corrupted");
1098 goto failed_mount2;
1099 }
1100 sbi->s_gdb_count = db_count;
1101 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1102 spin_lock_init(&sbi->s_next_gen_lock);
1103
1104 /* per filesystem reservation list head & lock */
1105 spin_lock_init(&sbi->s_rsv_window_lock);
1106 sbi->s_rsv_window_root = RB_ROOT;
1107 /*
1108 * Add a single, static dummy reservation to the start of the
1109 * reservation window list --- it gives us a placeholder for
1110 * append-at-start-of-list which makes the allocation logic
1111 * _much_ simpler.
1112 */
1113 sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
1114 sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
1115 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1116 sbi->s_rsv_window_head.rsv_goal_size = 0;
1117 ext2_rsv_window_add(sb, &sbi->s_rsv_window_head);
1118
1119 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1120 ext2_count_free_blocks(sb), GFP_KERNEL);
1121 if (!err) {
1122 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1123 ext2_count_free_inodes(sb), GFP_KERNEL);
1124 }
1125 if (!err) {
1126 err = percpu_counter_init(&sbi->s_dirs_counter,
1127 ext2_count_dirs(sb), GFP_KERNEL);
1128 }
1129 if (err) {
1130 ret = err;
1131 ext2_msg(sb, KERN_ERR, "error: insufficient memory");
1132 goto failed_mount3;
1133 }
1134
1135 #ifdef CONFIG_EXT2_FS_XATTR
1136 sbi->s_ea_block_cache = ext2_xattr_create_cache();
1137 if (!sbi->s_ea_block_cache) {
1138 ret = -ENOMEM;
1139 ext2_msg(sb, KERN_ERR, "Failed to create ea_block_cache");
1140 goto failed_mount3;
1141 }
1142 #endif
1143 /*
1144 * set up enough so that it can read an inode
1145 */
1146 sb->s_op = &ext2_sops;
1147 sb->s_export_op = &ext2_export_ops;
1148 sb->s_xattr = ext2_xattr_handlers;
1149
1150 #ifdef CONFIG_QUOTA
1151 sb->dq_op = &dquot_operations;
1152 sb->s_qcop = &ext2_quotactl_ops;
1153 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1154 #endif
1155
1156 root = ext2_iget(sb, EXT2_ROOT_INO);
1157 if (IS_ERR(root)) {
1158 ret = PTR_ERR(root);
1159 goto failed_mount3;
1160 }
1161 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1162 iput(root);
1163 ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
1164 goto failed_mount3;
1165 }
1166
1167 sb->s_root = d_make_root(root);
1168 if (!sb->s_root) {
1169 ext2_msg(sb, KERN_ERR, "error: get root inode failed");
1170 ret = -ENOMEM;
1171 goto failed_mount3;
1172 }
1173 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL))
1174 ext2_msg(sb, KERN_WARNING,
1175 "warning: mounting ext3 filesystem as ext2");
1176 if (ext2_setup_super (sb, es, sb_rdonly(sb)))
1177 sb->s_flags |= SB_RDONLY;
1178 ext2_write_super(sb);
1179 return 0;
1180
1181 cantfind_ext2:
1182 if (!silent)
1183 ext2_msg(sb, KERN_ERR,
1184 "error: can't find an ext2 filesystem on dev %s.",
1185 sb->s_id);
1186 goto failed_mount;
1187 failed_mount3:
1188 ext2_xattr_destroy_cache(sbi->s_ea_block_cache);
1189 percpu_counter_destroy(&sbi->s_freeblocks_counter);
1190 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1191 percpu_counter_destroy(&sbi->s_dirs_counter);
1192 failed_mount2:
1193 for (i = 0; i < db_count; i++)
1194 brelse(sbi->s_group_desc[i]);
1195 failed_mount_group_desc:
1196 kfree(sbi->s_group_desc);
1197 kfree(sbi->s_debts);
1198 failed_mount:
1199 brelse(bh);
1200 failed_sbi:
1201 sb->s_fs_info = NULL;
1202 kfree(sbi->s_blockgroup_lock);
1203 kfree(sbi);
1204 failed:
1205 fs_put_dax(dax_dev);
1206 return ret;
1207 }
1208
1209 static void ext2_clear_super_error(struct super_block *sb)
1210 {
1211 struct buffer_head *sbh = EXT2_SB(sb)->s_sbh;
1212
1213 if (buffer_write_io_error(sbh)) {
1214 /*
1215 * Oh, dear. A previous attempt to write the
1216 * superblock failed. This could happen because the
1217 * USB device was yanked out. Or it could happen to
1218 * be a transient write error and maybe the block will
1219 * be remapped. Nothing we can do but to retry the
1220 * write and hope for the best.
1221 */
1222 ext2_msg(sb, KERN_ERR,
1223 "previous I/O error to superblock detected");
1224 clear_buffer_write_io_error(sbh);
1225 set_buffer_uptodate(sbh);
1226 }
1227 }
1228
1229 void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es,
1230 int wait)
1231 {
1232 ext2_clear_super_error(sb);
1233 spin_lock(&EXT2_SB(sb)->s_lock);
1234 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb));
1235 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb));
1236 es->s_wtime = cpu_to_le32(ktime_get_real_seconds());
1237 /* unlock before we do IO */
1238 spin_unlock(&EXT2_SB(sb)->s_lock);
1239 mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
1240 if (wait)
1241 sync_dirty_buffer(EXT2_SB(sb)->s_sbh);
1242 }
1243
1244 /*
1245 * In the second extended file system, it is not necessary to
1246 * write the super block since we use a mapping of the
1247 * disk super block in a buffer.
1248 *
1249 * However, this function is still used to set the fs valid
1250 * flags to 0. We need to set this flag to 0 since the fs
1251 * may have been checked while mounted and e2fsck may have
1252 * set s_state to EXT2_VALID_FS after some corrections.
1253 */
1254 static int ext2_sync_fs(struct super_block *sb, int wait)
1255 {
1256 struct ext2_sb_info *sbi = EXT2_SB(sb);
1257 struct ext2_super_block *es = EXT2_SB(sb)->s_es;
1258
1259 /*
1260 * Write quota structures to quota file, sync_blockdev() will write
1261 * them to disk later
1262 */
1263 dquot_writeback_dquots(sb, -1);
1264
1265 spin_lock(&sbi->s_lock);
1266 if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) {
1267 ext2_debug("setting valid to 0\n");
1268 es->s_state &= cpu_to_le16(~EXT2_VALID_FS);
1269 }
1270 spin_unlock(&sbi->s_lock);
1271 ext2_sync_super(sb, es, wait);
1272 return 0;
1273 }
1274
1275 static int ext2_freeze(struct super_block *sb)
1276 {
1277 struct ext2_sb_info *sbi = EXT2_SB(sb);
1278
1279 /*
1280 * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared
1281 * because we have unattached inodes and thus filesystem is not fully
1282 * consistent.
1283 */
1284 if (atomic_long_read(&sb->s_remove_count)) {
1285 ext2_sync_fs(sb, 1);
1286 return 0;
1287 }
1288 /* Set EXT2_FS_VALID flag */
1289 spin_lock(&sbi->s_lock);
1290 sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state);
1291 spin_unlock(&sbi->s_lock);
1292 ext2_sync_super(sb, sbi->s_es, 1);
1293
1294 return 0;
1295 }
1296
1297 static int ext2_unfreeze(struct super_block *sb)
1298 {
1299 /* Just write sb to clear EXT2_VALID_FS flag */
1300 ext2_write_super(sb);
1301
1302 return 0;
1303 }
1304
1305 static void ext2_write_super(struct super_block *sb)
1306 {
1307 if (!sb_rdonly(sb))
1308 ext2_sync_fs(sb, 1);
1309 }
1310
1311 static int ext2_remount (struct super_block * sb, int * flags, char * data)
1312 {
1313 struct ext2_sb_info * sbi = EXT2_SB(sb);
1314 struct ext2_super_block * es;
1315 struct ext2_mount_options new_opts;
1316 int err;
1317
1318 sync_filesystem(sb);
1319
1320 spin_lock(&sbi->s_lock);
1321 new_opts.s_mount_opt = sbi->s_mount_opt;
1322 new_opts.s_resuid = sbi->s_resuid;
1323 new_opts.s_resgid = sbi->s_resgid;
1324 spin_unlock(&sbi->s_lock);
1325
1326 if (!parse_options(data, sb, &new_opts))
1327 return -EINVAL;
1328
1329 spin_lock(&sbi->s_lock);
1330 es = sbi->s_es;
1331 if ((sbi->s_mount_opt ^ new_opts.s_mount_opt) & EXT2_MOUNT_DAX) {
1332 ext2_msg(sb, KERN_WARNING, "warning: refusing change of "
1333 "dax flag with busy inodes while remounting");
1334 new_opts.s_mount_opt ^= EXT2_MOUNT_DAX;
1335 }
1336 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
1337 goto out_set;
1338 if (*flags & SB_RDONLY) {
1339 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS ||
1340 !(sbi->s_mount_state & EXT2_VALID_FS))
1341 goto out_set;
1342
1343 /*
1344 * OK, we are remounting a valid rw partition rdonly, so set
1345 * the rdonly flag and then mark the partition as valid again.
1346 */
1347 es->s_state = cpu_to_le16(sbi->s_mount_state);
1348 es->s_mtime = cpu_to_le32(ktime_get_real_seconds());
1349 spin_unlock(&sbi->s_lock);
1350
1351 err = dquot_suspend(sb, -1);
1352 if (err < 0)
1353 return err;
1354
1355 ext2_sync_super(sb, es, 1);
1356 } else {
1357 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb,
1358 ~EXT2_FEATURE_RO_COMPAT_SUPP);
1359 if (ret) {
1360 spin_unlock(&sbi->s_lock);
1361 ext2_msg(sb, KERN_WARNING,
1362 "warning: couldn't remount RDWR because of "
1363 "unsupported optional features (%x).",
1364 le32_to_cpu(ret));
1365 return -EROFS;
1366 }
1367 /*
1368 * Mounting a RDONLY partition read-write, so reread and
1369 * store the current valid flag. (It may have been changed
1370 * by e2fsck since we originally mounted the partition.)
1371 */
1372 sbi->s_mount_state = le16_to_cpu(es->s_state);
1373 if (!ext2_setup_super (sb, es, 0))
1374 sb->s_flags &= ~SB_RDONLY;
1375 spin_unlock(&sbi->s_lock);
1376
1377 ext2_write_super(sb);
1378
1379 dquot_resume(sb, -1);
1380 }
1381
1382 spin_lock(&sbi->s_lock);
1383 out_set:
1384 sbi->s_mount_opt = new_opts.s_mount_opt;
1385 sbi->s_resuid = new_opts.s_resuid;
1386 sbi->s_resgid = new_opts.s_resgid;
1387 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
1388 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
1389 spin_unlock(&sbi->s_lock);
1390
1391 return 0;
1392 }
1393
1394 static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf)
1395 {
1396 struct super_block *sb = dentry->d_sb;
1397 struct ext2_sb_info *sbi = EXT2_SB(sb);
1398 struct ext2_super_block *es = sbi->s_es;
1399
1400 spin_lock(&sbi->s_lock);
1401
1402 if (test_opt (sb, MINIX_DF))
1403 sbi->s_overhead_last = 0;
1404 else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
1405 unsigned long i, overhead = 0;
1406 smp_rmb();
1407
1408 /*
1409 * Compute the overhead (FS structures). This is constant
1410 * for a given filesystem unless the number of block groups
1411 * changes so we cache the previous value until it does.
1412 */
1413
1414 /*
1415 * All of the blocks before first_data_block are
1416 * overhead
1417 */
1418 overhead = le32_to_cpu(es->s_first_data_block);
1419
1420 /*
1421 * Add the overhead attributed to the superblock and
1422 * block group descriptors. If the sparse superblocks
1423 * feature is turned on, then not all groups have this.
1424 */
1425 for (i = 0; i < sbi->s_groups_count; i++)
1426 overhead += ext2_bg_has_super(sb, i) +
1427 ext2_bg_num_gdb(sb, i);
1428
1429 /*
1430 * Every block group has an inode bitmap, a block
1431 * bitmap, and an inode table.
1432 */
1433 overhead += (sbi->s_groups_count *
1434 (2 + sbi->s_itb_per_group));
1435 sbi->s_overhead_last = overhead;
1436 smp_wmb();
1437 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
1438 }
1439
1440 buf->f_type = EXT2_SUPER_MAGIC;
1441 buf->f_bsize = sb->s_blocksize;
1442 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
1443 buf->f_bfree = ext2_count_free_blocks(sb);
1444 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
1445 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
1446 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
1447 buf->f_bavail = 0;
1448 buf->f_files = le32_to_cpu(es->s_inodes_count);
1449 buf->f_ffree = ext2_count_free_inodes(sb);
1450 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
1451 buf->f_namelen = EXT2_NAME_LEN;
1452 buf->f_fsid = uuid_to_fsid(es->s_uuid);
1453 spin_unlock(&sbi->s_lock);
1454 return 0;
1455 }
1456
1457 static struct dentry *ext2_mount(struct file_system_type *fs_type,
1458 int flags, const char *dev_name, void *data)
1459 {
1460 return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super);
1461 }
1462
1463 #ifdef CONFIG_QUOTA
1464
1465 /* Read data from quotafile - avoid pagecache and such because we cannot afford
1466 * acquiring the locks... As quota files are never truncated and quota code
1467 * itself serializes the operations (and no one else should touch the files)
1468 * we don't have to be afraid of races */
1469 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data,
1470 size_t len, loff_t off)
1471 {
1472 struct inode *inode = sb_dqopt(sb)->files[type];
1473 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1474 int err = 0;
1475 int offset = off & (sb->s_blocksize - 1);
1476 int tocopy;
1477 size_t toread;
1478 struct buffer_head tmp_bh;
1479 struct buffer_head *bh;
1480 loff_t i_size = i_size_read(inode);
1481
1482 if (off > i_size)
1483 return 0;
1484 if (off+len > i_size)
1485 len = i_size-off;
1486 toread = len;
1487 while (toread > 0) {
1488 tocopy = sb->s_blocksize - offset < toread ?
1489 sb->s_blocksize - offset : toread;
1490
1491 tmp_bh.b_state = 0;
1492 tmp_bh.b_size = sb->s_blocksize;
1493 err = ext2_get_block(inode, blk, &tmp_bh, 0);
1494 if (err < 0)
1495 return err;
1496 if (!buffer_mapped(&tmp_bh)) /* A hole? */
1497 memset(data, 0, tocopy);
1498 else {
1499 bh = sb_bread(sb, tmp_bh.b_blocknr);
1500 if (!bh)
1501 return -EIO;
1502 memcpy(data, bh->b_data+offset, tocopy);
1503 brelse(bh);
1504 }
1505 offset = 0;
1506 toread -= tocopy;
1507 data += tocopy;
1508 blk++;
1509 }
1510 return len;
1511 }
1512
1513 /* Write to quotafile */
1514 static ssize_t ext2_quota_write(struct super_block *sb, int type,
1515 const char *data, size_t len, loff_t off)
1516 {
1517 struct inode *inode = sb_dqopt(sb)->files[type];
1518 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1519 int err = 0;
1520 int offset = off & (sb->s_blocksize - 1);
1521 int tocopy;
1522 size_t towrite = len;
1523 struct buffer_head tmp_bh;
1524 struct buffer_head *bh;
1525
1526 while (towrite > 0) {
1527 tocopy = sb->s_blocksize - offset < towrite ?
1528 sb->s_blocksize - offset : towrite;
1529
1530 tmp_bh.b_state = 0;
1531 tmp_bh.b_size = sb->s_blocksize;
1532 err = ext2_get_block(inode, blk, &tmp_bh, 1);
1533 if (err < 0)
1534 goto out;
1535 if (offset || tocopy != EXT2_BLOCK_SIZE(sb))
1536 bh = sb_bread(sb, tmp_bh.b_blocknr);
1537 else
1538 bh = sb_getblk(sb, tmp_bh.b_blocknr);
1539 if (unlikely(!bh)) {
1540 err = -EIO;
1541 goto out;
1542 }
1543 lock_buffer(bh);
1544 memcpy(bh->b_data+offset, data, tocopy);
1545 flush_dcache_page(bh->b_page);
1546 set_buffer_uptodate(bh);
1547 mark_buffer_dirty(bh);
1548 unlock_buffer(bh);
1549 brelse(bh);
1550 offset = 0;
1551 towrite -= tocopy;
1552 data += tocopy;
1553 blk++;
1554 }
1555 out:
1556 if (len == towrite)
1557 return err;
1558 if (inode->i_size < off+len-towrite)
1559 i_size_write(inode, off+len-towrite);
1560 inode_inc_iversion(inode);
1561 inode->i_mtime = inode->i_ctime = current_time(inode);
1562 mark_inode_dirty(inode);
1563 return len - towrite;
1564 }
1565
1566 static int ext2_quota_on(struct super_block *sb, int type, int format_id,
1567 const struct path *path)
1568 {
1569 int err;
1570 struct inode *inode;
1571
1572 err = dquot_quota_on(sb, type, format_id, path);
1573 if (err)
1574 return err;
1575
1576 inode = d_inode(path->dentry);
1577 inode_lock(inode);
1578 EXT2_I(inode)->i_flags |= EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL;
1579 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
1580 S_NOATIME | S_IMMUTABLE);
1581 inode_unlock(inode);
1582 mark_inode_dirty(inode);
1583
1584 return 0;
1585 }
1586
1587 static int ext2_quota_off(struct super_block *sb, int type)
1588 {
1589 struct inode *inode = sb_dqopt(sb)->files[type];
1590 int err;
1591
1592 if (!inode || !igrab(inode))
1593 goto out;
1594
1595 err = dquot_quota_off(sb, type);
1596 if (err)
1597 goto out_put;
1598
1599 inode_lock(inode);
1600 EXT2_I(inode)->i_flags &= ~(EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL);
1601 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
1602 inode_unlock(inode);
1603 mark_inode_dirty(inode);
1604 out_put:
1605 iput(inode);
1606 return err;
1607 out:
1608 return dquot_quota_off(sb, type);
1609 }
1610
1611 #endif
1612
1613 static struct file_system_type ext2_fs_type = {
1614 .owner = THIS_MODULE,
1615 .name = "ext2",
1616 .mount = ext2_mount,
1617 .kill_sb = kill_block_super,
1618 .fs_flags = FS_REQUIRES_DEV,
1619 };
1620 MODULE_ALIAS_FS("ext2");
1621
1622 static int __init init_ext2_fs(void)
1623 {
1624 int err;
1625
1626 err = init_inodecache();
1627 if (err)
1628 return err;
1629 err = register_filesystem(&ext2_fs_type);
1630 if (err)
1631 goto out;
1632 return 0;
1633 out:
1634 destroy_inodecache();
1635 return err;
1636 }
1637
1638 static void __exit exit_ext2_fs(void)
1639 {
1640 unregister_filesystem(&ext2_fs_type);
1641 destroy_inodecache();
1642 }
1643
1644 MODULE_AUTHOR("Remy Card and others");
1645 MODULE_DESCRIPTION("Second Extended Filesystem");
1646 MODULE_LICENSE("GPL");
1647 module_init(init_ext2_fs)
1648 module_exit(exit_ext2_fs)
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