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Merge tag 'mtd/fixes-for-5.2-final' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6/linux-2.6-arm.git] / fs / ext2 / super.c
blob1d7ab73b10148448e07c905b561c0e95087ba608
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 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_free_in_core_inode(struct inode *inode)
197 {
198 kmem_cache_free(ext2_inode_cachep, EXT2_I(inode));
199 }
200
201 static void init_once(void *foo)
202 {
203 struct ext2_inode_info *ei = (struct ext2_inode_info *) foo;
204
205 rwlock_init(&ei->i_meta_lock);
206 #ifdef CONFIG_EXT2_FS_XATTR
207 init_rwsem(&ei->xattr_sem);
208 #endif
209 mutex_init(&ei->truncate_mutex);
210 #ifdef CONFIG_FS_DAX
211 init_rwsem(&ei->dax_sem);
212 #endif
213 inode_init_once(&ei->vfs_inode);
214 }
215
216 static int __init init_inodecache(void)
217 {
218 ext2_inode_cachep = kmem_cache_create_usercopy("ext2_inode_cache",
219 sizeof(struct ext2_inode_info), 0,
220 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
221 SLAB_ACCOUNT),
222 offsetof(struct ext2_inode_info, i_data),
223 sizeof_field(struct ext2_inode_info, i_data),
224 init_once);
225 if (ext2_inode_cachep == NULL)
226 return -ENOMEM;
227 return 0;
228 }
229
230 static void destroy_inodecache(void)
231 {
232 /*
233 * Make sure all delayed rcu free inodes are flushed before we
234 * destroy cache.
235 */
236 rcu_barrier();
237 kmem_cache_destroy(ext2_inode_cachep);
238 }
239
240 static int ext2_show_options(struct seq_file *seq, struct dentry *root)
241 {
242 struct super_block *sb = root->d_sb;
243 struct ext2_sb_info *sbi = EXT2_SB(sb);
244 struct ext2_super_block *es = sbi->s_es;
245 unsigned long def_mount_opts;
246
247 spin_lock(&sbi->s_lock);
248 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
249
250 if (sbi->s_sb_block != 1)
251 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
252 if (test_opt(sb, MINIX_DF))
253 seq_puts(seq, ",minixdf");
254 if (test_opt(sb, GRPID))
255 seq_puts(seq, ",grpid");
256 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS))
257 seq_puts(seq, ",nogrpid");
258 if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT2_DEF_RESUID)) ||
259 le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) {
260 seq_printf(seq, ",resuid=%u",
261 from_kuid_munged(&init_user_ns, sbi->s_resuid));
262 }
263 if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT2_DEF_RESGID)) ||
264 le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) {
265 seq_printf(seq, ",resgid=%u",
266 from_kgid_munged(&init_user_ns, sbi->s_resgid));
267 }
268 if (test_opt(sb, ERRORS_RO)) {
269 int def_errors = le16_to_cpu(es->s_errors);
270
271 if (def_errors == EXT2_ERRORS_PANIC ||
272 def_errors == EXT2_ERRORS_CONTINUE) {
273 seq_puts(seq, ",errors=remount-ro");
274 }
275 }
276 if (test_opt(sb, ERRORS_CONT))
277 seq_puts(seq, ",errors=continue");
278 if (test_opt(sb, ERRORS_PANIC))
279 seq_puts(seq, ",errors=panic");
280 if (test_opt(sb, NO_UID32))
281 seq_puts(seq, ",nouid32");
282 if (test_opt(sb, DEBUG))
283 seq_puts(seq, ",debug");
284 if (test_opt(sb, OLDALLOC))
285 seq_puts(seq, ",oldalloc");
286
287 #ifdef CONFIG_EXT2_FS_XATTR
288 if (test_opt(sb, XATTR_USER))
289 seq_puts(seq, ",user_xattr");
290 if (!test_opt(sb, XATTR_USER) &&
291 (def_mount_opts & EXT2_DEFM_XATTR_USER)) {
292 seq_puts(seq, ",nouser_xattr");
293 }
294 #endif
295
296 #ifdef CONFIG_EXT2_FS_POSIX_ACL
297 if (test_opt(sb, POSIX_ACL))
298 seq_puts(seq, ",acl");
299 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL))
300 seq_puts(seq, ",noacl");
301 #endif
302
303 if (test_opt(sb, NOBH))
304 seq_puts(seq, ",nobh");
305
306 if (sbi->s_mount_opt & EXT2_MOUNT_USRQUOTA)
307 seq_puts(seq, ",usrquota");
308
309 if (sbi->s_mount_opt & EXT2_MOUNT_GRPQUOTA)
310 seq_puts(seq, ",grpquota");
311
312 if (sbi->s_mount_opt & EXT2_MOUNT_XIP)
313 seq_puts(seq, ",xip");
314
315 if (sbi->s_mount_opt & EXT2_MOUNT_DAX)
316 seq_puts(seq, ",dax");
317
318 if (!test_opt(sb, RESERVATION))
319 seq_puts(seq, ",noreservation");
320
321 spin_unlock(&sbi->s_lock);
322 return 0;
323 }
324
325 #ifdef CONFIG_QUOTA
326 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off);
327 static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off);
328 static int ext2_quota_on(struct super_block *sb, int type, int format_id,
329 const struct path *path);
330 static struct dquot **ext2_get_dquots(struct inode *inode)
331 {
332 return EXT2_I(inode)->i_dquot;
333 }
334
335 static const struct quotactl_ops ext2_quotactl_ops = {
336 .quota_on = ext2_quota_on,
337 .quota_off = ext2_quota_off,
338 .quota_sync = dquot_quota_sync,
339 .get_state = dquot_get_state,
340 .set_info = dquot_set_dqinfo,
341 .get_dqblk = dquot_get_dqblk,
342 .set_dqblk = dquot_set_dqblk,
343 .get_nextdqblk = dquot_get_next_dqblk,
344 };
345 #endif
346
347 static const struct super_operations ext2_sops = {
348 .alloc_inode = ext2_alloc_inode,
349 .free_inode = ext2_free_in_core_inode,
350 .write_inode = ext2_write_inode,
351 .evict_inode = ext2_evict_inode,
352 .put_super = ext2_put_super,
353 .sync_fs = ext2_sync_fs,
354 .freeze_fs = ext2_freeze,
355 .unfreeze_fs = ext2_unfreeze,
356 .statfs = ext2_statfs,
357 .remount_fs = ext2_remount,
358 .show_options = ext2_show_options,
359 #ifdef CONFIG_QUOTA
360 .quota_read = ext2_quota_read,
361 .quota_write = ext2_quota_write,
362 .get_dquots = ext2_get_dquots,
363 #endif
364 };
365
366 static struct inode *ext2_nfs_get_inode(struct super_block *sb,
367 u64 ino, u32 generation)
368 {
369 struct inode *inode;
370
371 if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO)
372 return ERR_PTR(-ESTALE);
373 if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count))
374 return ERR_PTR(-ESTALE);
375
376 /*
377 * ext2_iget isn't quite right if the inode is currently unallocated!
378 * However ext2_iget currently does appropriate checks to handle stale
379 * inodes so everything is OK.
380 */
381 inode = ext2_iget(sb, ino);
382 if (IS_ERR(inode))
383 return ERR_CAST(inode);
384 if (generation && inode->i_generation != generation) {
385 /* we didn't find the right inode.. */
386 iput(inode);
387 return ERR_PTR(-ESTALE);
388 }
389 return inode;
390 }
391
392 static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid,
393 int fh_len, int fh_type)
394 {
395 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
396 ext2_nfs_get_inode);
397 }
398
399 static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid,
400 int fh_len, int fh_type)
401 {
402 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
403 ext2_nfs_get_inode);
404 }
405
406 static const struct export_operations ext2_export_ops = {
407 .fh_to_dentry = ext2_fh_to_dentry,
408 .fh_to_parent = ext2_fh_to_parent,
409 .get_parent = ext2_get_parent,
410 };
411
412 static unsigned long get_sb_block(void **data)
413 {
414 unsigned long sb_block;
415 char *options = (char *) *data;
416
417 if (!options || strncmp(options, "sb=", 3) != 0)
418 return 1; /* Default location */
419 options += 3;
420 sb_block = simple_strtoul(options, &options, 0);
421 if (*options && *options != ',') {
422 printk("EXT2-fs: Invalid sb specification: %s\n",
423 (char *) *data);
424 return 1;
425 }
426 if (*options == ',')
427 options++;
428 *data = (void *) options;
429 return sb_block;
430 }
431
432 enum {
433 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
434 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic,
435 Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug,
436 Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr,
437 Opt_acl, Opt_noacl, Opt_xip, Opt_dax, Opt_ignore, Opt_err, Opt_quota,
438 Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation
439 };
440
441 static const match_table_t tokens = {
442 {Opt_bsd_df, "bsddf"},
443 {Opt_minix_df, "minixdf"},
444 {Opt_grpid, "grpid"},
445 {Opt_grpid, "bsdgroups"},
446 {Opt_nogrpid, "nogrpid"},
447 {Opt_nogrpid, "sysvgroups"},
448 {Opt_resgid, "resgid=%u"},
449 {Opt_resuid, "resuid=%u"},
450 {Opt_sb, "sb=%u"},
451 {Opt_err_cont, "errors=continue"},
452 {Opt_err_panic, "errors=panic"},
453 {Opt_err_ro, "errors=remount-ro"},
454 {Opt_nouid32, "nouid32"},
455 {Opt_nocheck, "check=none"},
456 {Opt_nocheck, "nocheck"},
457 {Opt_debug, "debug"},
458 {Opt_oldalloc, "oldalloc"},
459 {Opt_orlov, "orlov"},
460 {Opt_nobh, "nobh"},
461 {Opt_user_xattr, "user_xattr"},
462 {Opt_nouser_xattr, "nouser_xattr"},
463 {Opt_acl, "acl"},
464 {Opt_noacl, "noacl"},
465 {Opt_xip, "xip"},
466 {Opt_dax, "dax"},
467 {Opt_grpquota, "grpquota"},
468 {Opt_ignore, "noquota"},
469 {Opt_quota, "quota"},
470 {Opt_usrquota, "usrquota"},
471 {Opt_reservation, "reservation"},
472 {Opt_noreservation, "noreservation"},
473 {Opt_err, NULL}
474 };
475
476 static int parse_options(char *options, struct super_block *sb,
477 struct ext2_mount_options *opts)
478 {
479 char *p;
480 substring_t args[MAX_OPT_ARGS];
481 int option;
482 kuid_t uid;
483 kgid_t gid;
484
485 if (!options)
486 return 1;
487
488 while ((p = strsep (&options, ",")) != NULL) {
489 int token;
490 if (!*p)
491 continue;
492
493 token = match_token(p, tokens, args);
494 switch (token) {
495 case Opt_bsd_df:
496 clear_opt (opts->s_mount_opt, MINIX_DF);
497 break;
498 case Opt_minix_df:
499 set_opt (opts->s_mount_opt, MINIX_DF);
500 break;
501 case Opt_grpid:
502 set_opt (opts->s_mount_opt, GRPID);
503 break;
504 case Opt_nogrpid:
505 clear_opt (opts->s_mount_opt, GRPID);
506 break;
507 case Opt_resuid:
508 if (match_int(&args[0], &option))
509 return 0;
510 uid = make_kuid(current_user_ns(), option);
511 if (!uid_valid(uid)) {
512 ext2_msg(sb, KERN_ERR, "Invalid uid value %d", option);
513 return 0;
514
515 }
516 opts->s_resuid = uid;
517 break;
518 case Opt_resgid:
519 if (match_int(&args[0], &option))
520 return 0;
521 gid = make_kgid(current_user_ns(), option);
522 if (!gid_valid(gid)) {
523 ext2_msg(sb, KERN_ERR, "Invalid gid value %d", option);
524 return 0;
525 }
526 opts->s_resgid = gid;
527 break;
528 case Opt_sb:
529 /* handled by get_sb_block() instead of here */
530 /* *sb_block = match_int(&args[0]); */
531 break;
532 case Opt_err_panic:
533 clear_opt (opts->s_mount_opt, ERRORS_CONT);
534 clear_opt (opts->s_mount_opt, ERRORS_RO);
535 set_opt (opts->s_mount_opt, ERRORS_PANIC);
536 break;
537 case Opt_err_ro:
538 clear_opt (opts->s_mount_opt, ERRORS_CONT);
539 clear_opt (opts->s_mount_opt, ERRORS_PANIC);
540 set_opt (opts->s_mount_opt, ERRORS_RO);
541 break;
542 case Opt_err_cont:
543 clear_opt (opts->s_mount_opt, ERRORS_RO);
544 clear_opt (opts->s_mount_opt, ERRORS_PANIC);
545 set_opt (opts->s_mount_opt, ERRORS_CONT);
546 break;
547 case Opt_nouid32:
548 set_opt (opts->s_mount_opt, NO_UID32);
549 break;
550 case Opt_nocheck:
551 ext2_msg(sb, KERN_WARNING,
552 "Option nocheck/check=none is deprecated and"
553 " will be removed in June 2020.");
554 clear_opt (opts->s_mount_opt, CHECK);
555 break;
556 case Opt_debug:
557 set_opt (opts->s_mount_opt, DEBUG);
558 break;
559 case Opt_oldalloc:
560 set_opt (opts->s_mount_opt, OLDALLOC);
561 break;
562 case Opt_orlov:
563 clear_opt (opts->s_mount_opt, OLDALLOC);
564 break;
565 case Opt_nobh:
566 set_opt (opts->s_mount_opt, NOBH);
567 break;
568 #ifdef CONFIG_EXT2_FS_XATTR
569 case Opt_user_xattr:
570 set_opt (opts->s_mount_opt, XATTR_USER);
571 break;
572 case Opt_nouser_xattr:
573 clear_opt (opts->s_mount_opt, XATTR_USER);
574 break;
575 #else
576 case Opt_user_xattr:
577 case Opt_nouser_xattr:
578 ext2_msg(sb, KERN_INFO, "(no)user_xattr options"
579 "not supported");
580 break;
581 #endif
582 #ifdef CONFIG_EXT2_FS_POSIX_ACL
583 case Opt_acl:
584 set_opt(opts->s_mount_opt, POSIX_ACL);
585 break;
586 case Opt_noacl:
587 clear_opt(opts->s_mount_opt, POSIX_ACL);
588 break;
589 #else
590 case Opt_acl:
591 case Opt_noacl:
592 ext2_msg(sb, KERN_INFO,
593 "(no)acl options not supported");
594 break;
595 #endif
596 case Opt_xip:
597 ext2_msg(sb, KERN_INFO, "use dax instead of xip");
598 set_opt(opts->s_mount_opt, XIP);
599 /* Fall through */
600 case Opt_dax:
601 #ifdef CONFIG_FS_DAX
602 ext2_msg(sb, KERN_WARNING,
603 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
604 set_opt(opts->s_mount_opt, DAX);
605 #else
606 ext2_msg(sb, KERN_INFO, "dax option not supported");
607 #endif
608 break;
609
610 #if defined(CONFIG_QUOTA)
611 case Opt_quota:
612 case Opt_usrquota:
613 set_opt(opts->s_mount_opt, USRQUOTA);
614 break;
615
616 case Opt_grpquota:
617 set_opt(opts->s_mount_opt, GRPQUOTA);
618 break;
619 #else
620 case Opt_quota:
621 case Opt_usrquota:
622 case Opt_grpquota:
623 ext2_msg(sb, KERN_INFO,
624 "quota operations not supported");
625 break;
626 #endif
627
628 case Opt_reservation:
629 set_opt(opts->s_mount_opt, RESERVATION);
630 ext2_msg(sb, KERN_INFO, "reservations ON");
631 break;
632 case Opt_noreservation:
633 clear_opt(opts->s_mount_opt, RESERVATION);
634 ext2_msg(sb, KERN_INFO, "reservations OFF");
635 break;
636 case Opt_ignore:
637 break;
638 default:
639 return 0;
640 }
641 }
642 return 1;
643 }
644
645 static int ext2_setup_super (struct super_block * sb,
646 struct ext2_super_block * es,
647 int read_only)
648 {
649 int res = 0;
650 struct ext2_sb_info *sbi = EXT2_SB(sb);
651
652 if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) {
653 ext2_msg(sb, KERN_ERR,
654 "error: revision level too high, "
655 "forcing read-only mode");
656 res = SB_RDONLY;
657 }
658 if (read_only)
659 return res;
660 if (!(sbi->s_mount_state & EXT2_VALID_FS))
661 ext2_msg(sb, KERN_WARNING,
662 "warning: mounting unchecked fs, "
663 "running e2fsck is recommended");
664 else if ((sbi->s_mount_state & EXT2_ERROR_FS))
665 ext2_msg(sb, KERN_WARNING,
666 "warning: mounting fs with errors, "
667 "running e2fsck is recommended");
668 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
669 le16_to_cpu(es->s_mnt_count) >=
670 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
671 ext2_msg(sb, KERN_WARNING,
672 "warning: maximal mount count reached, "
673 "running e2fsck is recommended");
674 else if (le32_to_cpu(es->s_checkinterval) &&
675 (le32_to_cpu(es->s_lastcheck) +
676 le32_to_cpu(es->s_checkinterval) <=
677 ktime_get_real_seconds()))
678 ext2_msg(sb, KERN_WARNING,
679 "warning: checktime reached, "
680 "running e2fsck is recommended");
681 if (!le16_to_cpu(es->s_max_mnt_count))
682 es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT);
683 le16_add_cpu(&es->s_mnt_count, 1);
684 if (test_opt (sb, DEBUG))
685 ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, fs=%lu, gc=%lu, "
686 "bpg=%lu, ipg=%lu, mo=%04lx]",
687 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize,
688 sbi->s_frag_size,
689 sbi->s_groups_count,
690 EXT2_BLOCKS_PER_GROUP(sb),
691 EXT2_INODES_PER_GROUP(sb),
692 sbi->s_mount_opt);
693 return res;
694 }
695
696 static int ext2_check_descriptors(struct super_block *sb)
697 {
698 int i;
699 struct ext2_sb_info *sbi = EXT2_SB(sb);
700
701 ext2_debug ("Checking group descriptors");
702
703 for (i = 0; i < sbi->s_groups_count; i++) {
704 struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL);
705 ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i);
706 ext2_fsblk_t last_block;
707
708 if (i == sbi->s_groups_count - 1)
709 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
710 else
711 last_block = first_block +
712 (EXT2_BLOCKS_PER_GROUP(sb) - 1);
713
714 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
715 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
716 {
717 ext2_error (sb, "ext2_check_descriptors",
718 "Block bitmap for group %d"
719 " not in group (block %lu)!",
720 i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap));
721 return 0;
722 }
723 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
724 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
725 {
726 ext2_error (sb, "ext2_check_descriptors",
727 "Inode bitmap for group %d"
728 " not in group (block %lu)!",
729 i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap));
730 return 0;
731 }
732 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
733 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
734 last_block)
735 {
736 ext2_error (sb, "ext2_check_descriptors",
737 "Inode table for group %d"
738 " not in group (block %lu)!",
739 i, (unsigned long) le32_to_cpu(gdp->bg_inode_table));
740 return 0;
741 }
742 }
743 return 1;
744 }
745
746 /*
747 * Maximal file size. There is a direct, and {,double-,triple-}indirect
748 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
749 * We need to be 1 filesystem block less than the 2^32 sector limit.
750 */
751 static loff_t ext2_max_size(int bits)
752 {
753 loff_t res = EXT2_NDIR_BLOCKS;
754 int meta_blocks;
755 unsigned int upper_limit;
756 unsigned int ppb = 1 << (bits-2);
757
758 /* This is calculated to be the largest file size for a
759 * dense, file such that the total number of
760 * sectors in the file, including data and all indirect blocks,
761 * does not exceed 2^32 -1
762 * __u32 i_blocks representing the total number of
763 * 512 bytes blocks of the file
764 */
765 upper_limit = (1LL << 32) - 1;
766
767 /* total blocks in file system block size */
768 upper_limit >>= (bits - 9);
769
770 /* Compute how many blocks we can address by block tree */
771 res += 1LL << (bits-2);
772 res += 1LL << (2*(bits-2));
773 res += 1LL << (3*(bits-2));
774 /* Does block tree limit file size? */
775 if (res < upper_limit)
776 goto check_lfs;
777
778 res = upper_limit;
779 /* How many metadata blocks are needed for addressing upper_limit? */
780 upper_limit -= EXT2_NDIR_BLOCKS;
781 /* indirect blocks */
782 meta_blocks = 1;
783 upper_limit -= ppb;
784 /* double indirect blocks */
785 if (upper_limit < ppb * ppb) {
786 meta_blocks += 1 + DIV_ROUND_UP(upper_limit, ppb);
787 res -= meta_blocks;
788 goto check_lfs;
789 }
790 meta_blocks += 1 + ppb;
791 upper_limit -= ppb * ppb;
792 /* tripple indirect blocks for the rest */
793 meta_blocks += 1 + DIV_ROUND_UP(upper_limit, ppb) +
794 DIV_ROUND_UP(upper_limit, ppb*ppb);
795 res -= meta_blocks;
796 check_lfs:
797 res <<= bits;
798 if (res > MAX_LFS_FILESIZE)
799 res = MAX_LFS_FILESIZE;
800
801 return res;
802 }
803
804 static unsigned long descriptor_loc(struct super_block *sb,
805 unsigned long logic_sb_block,
806 int nr)
807 {
808 struct ext2_sb_info *sbi = EXT2_SB(sb);
809 unsigned long bg, first_meta_bg;
810 int has_super = 0;
811
812 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
813
814 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) ||
815 nr < first_meta_bg)
816 return (logic_sb_block + nr + 1);
817 bg = sbi->s_desc_per_block * nr;
818 if (ext2_bg_has_super(sb, bg))
819 has_super = 1;
820
821 return ext2_group_first_block_no(sb, bg) + has_super;
822 }
823
824 static int ext2_fill_super(struct super_block *sb, void *data, int silent)
825 {
826 struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev);
827 struct buffer_head * bh;
828 struct ext2_sb_info * sbi;
829 struct ext2_super_block * es;
830 struct inode *root;
831 unsigned long block;
832 unsigned long sb_block = get_sb_block(&data);
833 unsigned long logic_sb_block;
834 unsigned long offset = 0;
835 unsigned long def_mount_opts;
836 long ret = -ENOMEM;
837 int blocksize = BLOCK_SIZE;
838 int db_count;
839 int i, j;
840 __le32 features;
841 int err;
842 struct ext2_mount_options opts;
843
844 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
845 if (!sbi)
846 goto failed;
847
848 sbi->s_blockgroup_lock =
849 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
850 if (!sbi->s_blockgroup_lock) {
851 kfree(sbi);
852 goto failed;
853 }
854 sb->s_fs_info = sbi;
855 sbi->s_sb_block = sb_block;
856 sbi->s_daxdev = dax_dev;
857
858 spin_lock_init(&sbi->s_lock);
859 ret = -EINVAL;
860
861 /*
862 * See what the current blocksize for the device is, and
863 * use that as the blocksize. Otherwise (or if the blocksize
864 * is smaller than the default) use the default.
865 * This is important for devices that have a hardware
866 * sectorsize that is larger than the default.
867 */
868 blocksize = sb_min_blocksize(sb, BLOCK_SIZE);
869 if (!blocksize) {
870 ext2_msg(sb, KERN_ERR, "error: unable to set blocksize");
871 goto failed_sbi;
872 }
873
874 /*
875 * If the superblock doesn't start on a hardware sector boundary,
876 * calculate the offset.
877 */
878 if (blocksize != BLOCK_SIZE) {
879 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
880 offset = (sb_block*BLOCK_SIZE) % blocksize;
881 } else {
882 logic_sb_block = sb_block;
883 }
884
885 if (!(bh = sb_bread(sb, logic_sb_block))) {
886 ext2_msg(sb, KERN_ERR, "error: unable to read superblock");
887 goto failed_sbi;
888 }
889 /*
890 * Note: s_es must be initialized as soon as possible because
891 * some ext2 macro-instructions depend on its value
892 */
893 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
894 sbi->s_es = es;
895 sb->s_magic = le16_to_cpu(es->s_magic);
896
897 if (sb->s_magic != EXT2_SUPER_MAGIC)
898 goto cantfind_ext2;
899
900 opts.s_mount_opt = 0;
901 /* Set defaults before we parse the mount options */
902 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
903 if (def_mount_opts & EXT2_DEFM_DEBUG)
904 set_opt(opts.s_mount_opt, DEBUG);
905 if (def_mount_opts & EXT2_DEFM_BSDGROUPS)
906 set_opt(opts.s_mount_opt, GRPID);
907 if (def_mount_opts & EXT2_DEFM_UID16)
908 set_opt(opts.s_mount_opt, NO_UID32);
909 #ifdef CONFIG_EXT2_FS_XATTR
910 if (def_mount_opts & EXT2_DEFM_XATTR_USER)
911 set_opt(opts.s_mount_opt, XATTR_USER);
912 #endif
913 #ifdef CONFIG_EXT2_FS_POSIX_ACL
914 if (def_mount_opts & EXT2_DEFM_ACL)
915 set_opt(opts.s_mount_opt, POSIX_ACL);
916 #endif
917
918 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
919 set_opt(opts.s_mount_opt, ERRORS_PANIC);
920 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE)
921 set_opt(opts.s_mount_opt, ERRORS_CONT);
922 else
923 set_opt(opts.s_mount_opt, ERRORS_RO);
924
925 opts.s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
926 opts.s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
927
928 set_opt(opts.s_mount_opt, RESERVATION);
929
930 if (!parse_options((char *) data, sb, &opts))
931 goto failed_mount;
932
933 sbi->s_mount_opt = opts.s_mount_opt;
934 sbi->s_resuid = opts.s_resuid;
935 sbi->s_resgid = opts.s_resgid;
936
937 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
938 ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ?
939 SB_POSIXACL : 0);
940 sb->s_iflags |= SB_I_CGROUPWB;
941
942 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV &&
943 (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) ||
944 EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
945 EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U)))
946 ext2_msg(sb, KERN_WARNING,
947 "warning: feature flags set on rev 0 fs, "
948 "running e2fsck is recommended");
949 /*
950 * Check feature flags regardless of the revision level, since we
951 * previously didn't change the revision level when setting the flags,
952 * so there is a chance incompat flags are set on a rev 0 filesystem.
953 */
954 features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP);
955 if (features) {
956 ext2_msg(sb, KERN_ERR, "error: couldn't mount because of "
957 "unsupported optional features (%x)",
958 le32_to_cpu(features));
959 goto failed_mount;
960 }
961 if (!sb_rdonly(sb) && (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){
962 ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of "
963 "unsupported optional features (%x)",
964 le32_to_cpu(features));
965 goto failed_mount;
966 }
967
968 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
969
970 if (sbi->s_mount_opt & EXT2_MOUNT_DAX) {
971 if (!bdev_dax_supported(sb->s_bdev, blocksize)) {
972 ext2_msg(sb, KERN_ERR,
973 "DAX unsupported by block device. Turning off DAX.");
974 sbi->s_mount_opt &= ~EXT2_MOUNT_DAX;
975 }
976 }
977
978 /* If the blocksize doesn't match, re-read the thing.. */
979 if (sb->s_blocksize != blocksize) {
980 brelse(bh);
981
982 if (!sb_set_blocksize(sb, blocksize)) {
983 ext2_msg(sb, KERN_ERR,
984 "error: bad blocksize %d", blocksize);
985 goto failed_sbi;
986 }
987
988 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
989 offset = (sb_block*BLOCK_SIZE) % blocksize;
990 bh = sb_bread(sb, logic_sb_block);
991 if(!bh) {
992 ext2_msg(sb, KERN_ERR, "error: couldn't read"
993 "superblock on 2nd try");
994 goto failed_sbi;
995 }
996 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
997 sbi->s_es = es;
998 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) {
999 ext2_msg(sb, KERN_ERR, "error: magic mismatch");
1000 goto failed_mount;
1001 }
1002 }
1003
1004 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits);
1005 sb->s_max_links = EXT2_LINK_MAX;
1006
1007 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) {
1008 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
1009 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
1010 } else {
1011 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1012 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1013 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) ||
1014 !is_power_of_2(sbi->s_inode_size) ||
1015 (sbi->s_inode_size > blocksize)) {
1016 ext2_msg(sb, KERN_ERR,
1017 "error: unsupported inode size: %d",
1018 sbi->s_inode_size);
1019 goto failed_mount;
1020 }
1021 }
1022
1023 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE <<
1024 le32_to_cpu(es->s_log_frag_size);
1025 if (sbi->s_frag_size == 0)
1026 goto cantfind_ext2;
1027 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size;
1028
1029 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1030 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1031 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1032
1033 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb);
1034 if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0)
1035 goto cantfind_ext2;
1036 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1037 sbi->s_inodes_per_block;
1038 sbi->s_desc_per_block = sb->s_blocksize /
1039 sizeof (struct ext2_group_desc);
1040 sbi->s_sbh = bh;
1041 sbi->s_mount_state = le16_to_cpu(es->s_state);
1042 sbi->s_addr_per_block_bits =
1043 ilog2 (EXT2_ADDR_PER_BLOCK(sb));
1044 sbi->s_desc_per_block_bits =
1045 ilog2 (EXT2_DESC_PER_BLOCK(sb));
1046
1047 if (sb->s_magic != EXT2_SUPER_MAGIC)
1048 goto cantfind_ext2;
1049
1050 if (sb->s_blocksize != bh->b_size) {
1051 if (!silent)
1052 ext2_msg(sb, KERN_ERR, "error: unsupported blocksize");
1053 goto failed_mount;
1054 }
1055
1056 if (sb->s_blocksize != sbi->s_frag_size) {
1057 ext2_msg(sb, KERN_ERR,
1058 "error: fragsize %lu != blocksize %lu"
1059 "(not supported yet)",
1060 sbi->s_frag_size, sb->s_blocksize);
1061 goto failed_mount;
1062 }
1063
1064 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) {
1065 ext2_msg(sb, KERN_ERR,
1066 "error: #blocks per group too big: %lu",
1067 sbi->s_blocks_per_group);
1068 goto failed_mount;
1069 }
1070 if (sbi->s_frags_per_group > sb->s_blocksize * 8) {
1071 ext2_msg(sb, KERN_ERR,
1072 "error: #fragments per group too big: %lu",
1073 sbi->s_frags_per_group);
1074 goto failed_mount;
1075 }
1076 if (sbi->s_inodes_per_group > sb->s_blocksize * 8) {
1077 ext2_msg(sb, KERN_ERR,
1078 "error: #inodes per group too big: %lu",
1079 sbi->s_inodes_per_group);
1080 goto failed_mount;
1081 }
1082
1083 if (EXT2_BLOCKS_PER_GROUP(sb) == 0)
1084 goto cantfind_ext2;
1085 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1086 le32_to_cpu(es->s_first_data_block) - 1)
1087 / EXT2_BLOCKS_PER_GROUP(sb)) + 1;
1088 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
1089 EXT2_DESC_PER_BLOCK(sb);
1090 sbi->s_group_desc = kmalloc_array (db_count,
1091 sizeof(struct buffer_head *),
1092 GFP_KERNEL);
1093 if (sbi->s_group_desc == NULL) {
1094 ret = -ENOMEM;
1095 ext2_msg(sb, KERN_ERR, "error: not enough memory");
1096 goto failed_mount;
1097 }
1098 bgl_lock_init(sbi->s_blockgroup_lock);
1099 sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL);
1100 if (!sbi->s_debts) {
1101 ret = -ENOMEM;
1102 ext2_msg(sb, KERN_ERR, "error: not enough memory");
1103 goto failed_mount_group_desc;
1104 }
1105 for (i = 0; i < db_count; i++) {
1106 block = descriptor_loc(sb, logic_sb_block, i);
1107 sbi->s_group_desc[i] = sb_bread(sb, block);
1108 if (!sbi->s_group_desc[i]) {
1109 for (j = 0; j < i; j++)
1110 brelse (sbi->s_group_desc[j]);
1111 ext2_msg(sb, KERN_ERR,
1112 "error: unable to read group descriptors");
1113 goto failed_mount_group_desc;
1114 }
1115 }
1116 if (!ext2_check_descriptors (sb)) {
1117 ext2_msg(sb, KERN_ERR, "group descriptors corrupted");
1118 goto failed_mount2;
1119 }
1120 sbi->s_gdb_count = db_count;
1121 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1122 spin_lock_init(&sbi->s_next_gen_lock);
1123
1124 /* per fileystem reservation list head & lock */
1125 spin_lock_init(&sbi->s_rsv_window_lock);
1126 sbi->s_rsv_window_root = RB_ROOT;
1127 /*
1128 * Add a single, static dummy reservation to the start of the
1129 * reservation window list --- it gives us a placeholder for
1130 * append-at-start-of-list which makes the allocation logic
1131 * _much_ simpler.
1132 */
1133 sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
1134 sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
1135 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1136 sbi->s_rsv_window_head.rsv_goal_size = 0;
1137 ext2_rsv_window_add(sb, &sbi->s_rsv_window_head);
1138
1139 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1140 ext2_count_free_blocks(sb), GFP_KERNEL);
1141 if (!err) {
1142 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1143 ext2_count_free_inodes(sb), GFP_KERNEL);
1144 }
1145 if (!err) {
1146 err = percpu_counter_init(&sbi->s_dirs_counter,
1147 ext2_count_dirs(sb), GFP_KERNEL);
1148 }
1149 if (err) {
1150 ext2_msg(sb, KERN_ERR, "error: insufficient memory");
1151 goto failed_mount3;
1152 }
1153
1154 #ifdef CONFIG_EXT2_FS_XATTR
1155 sbi->s_ea_block_cache = ext2_xattr_create_cache();
1156 if (!sbi->s_ea_block_cache) {
1157 ret = -ENOMEM;
1158 ext2_msg(sb, KERN_ERR, "Failed to create ea_block_cache");
1159 goto failed_mount3;
1160 }
1161 #endif
1162 /*
1163 * set up enough so that it can read an inode
1164 */
1165 sb->s_op = &ext2_sops;
1166 sb->s_export_op = &ext2_export_ops;
1167 sb->s_xattr = ext2_xattr_handlers;
1168
1169 #ifdef CONFIG_QUOTA
1170 sb->dq_op = &dquot_operations;
1171 sb->s_qcop = &ext2_quotactl_ops;
1172 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1173 #endif
1174
1175 root = ext2_iget(sb, EXT2_ROOT_INO);
1176 if (IS_ERR(root)) {
1177 ret = PTR_ERR(root);
1178 goto failed_mount3;
1179 }
1180 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1181 iput(root);
1182 ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
1183 goto failed_mount3;
1184 }
1185
1186 sb->s_root = d_make_root(root);
1187 if (!sb->s_root) {
1188 ext2_msg(sb, KERN_ERR, "error: get root inode failed");
1189 ret = -ENOMEM;
1190 goto failed_mount3;
1191 }
1192 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL))
1193 ext2_msg(sb, KERN_WARNING,
1194 "warning: mounting ext3 filesystem as ext2");
1195 if (ext2_setup_super (sb, es, sb_rdonly(sb)))
1196 sb->s_flags |= SB_RDONLY;
1197 ext2_write_super(sb);
1198 return 0;
1199
1200 cantfind_ext2:
1201 if (!silent)
1202 ext2_msg(sb, KERN_ERR,
1203 "error: can't find an ext2 filesystem on dev %s.",
1204 sb->s_id);
1205 goto failed_mount;
1206 failed_mount3:
1207 ext2_xattr_destroy_cache(sbi->s_ea_block_cache);
1208 percpu_counter_destroy(&sbi->s_freeblocks_counter);
1209 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1210 percpu_counter_destroy(&sbi->s_dirs_counter);
1211 failed_mount2:
1212 for (i = 0; i < db_count; i++)
1213 brelse(sbi->s_group_desc[i]);
1214 failed_mount_group_desc:
1215 kfree(sbi->s_group_desc);
1216 kfree(sbi->s_debts);
1217 failed_mount:
1218 brelse(bh);
1219 failed_sbi:
1220 sb->s_fs_info = NULL;
1221 kfree(sbi->s_blockgroup_lock);
1222 kfree(sbi);
1223 failed:
1224 fs_put_dax(dax_dev);
1225 return ret;
1226 }
1227
1228 static void ext2_clear_super_error(struct super_block *sb)
1229 {
1230 struct buffer_head *sbh = EXT2_SB(sb)->s_sbh;
1231
1232 if (buffer_write_io_error(sbh)) {
1233 /*
1234 * Oh, dear. A previous attempt to write the
1235 * superblock failed. This could happen because the
1236 * USB device was yanked out. Or it could happen to
1237 * be a transient write error and maybe the block will
1238 * be remapped. Nothing we can do but to retry the
1239 * write and hope for the best.
1240 */
1241 ext2_msg(sb, KERN_ERR,
1242 "previous I/O error to superblock detected");
1243 clear_buffer_write_io_error(sbh);
1244 set_buffer_uptodate(sbh);
1245 }
1246 }
1247
1248 void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es,
1249 int wait)
1250 {
1251 ext2_clear_super_error(sb);
1252 spin_lock(&EXT2_SB(sb)->s_lock);
1253 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb));
1254 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb));
1255 es->s_wtime = cpu_to_le32(ktime_get_real_seconds());
1256 /* unlock before we do IO */
1257 spin_unlock(&EXT2_SB(sb)->s_lock);
1258 mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
1259 if (wait)
1260 sync_dirty_buffer(EXT2_SB(sb)->s_sbh);
1261 }
1262
1263 /*
1264 * In the second extended file system, it is not necessary to
1265 * write the super block since we use a mapping of the
1266 * disk super block in a buffer.
1267 *
1268 * However, this function is still used to set the fs valid
1269 * flags to 0. We need to set this flag to 0 since the fs
1270 * may have been checked while mounted and e2fsck may have
1271 * set s_state to EXT2_VALID_FS after some corrections.
1272 */
1273 static int ext2_sync_fs(struct super_block *sb, int wait)
1274 {
1275 struct ext2_sb_info *sbi = EXT2_SB(sb);
1276 struct ext2_super_block *es = EXT2_SB(sb)->s_es;
1277
1278 /*
1279 * Write quota structures to quota file, sync_blockdev() will write
1280 * them to disk later
1281 */
1282 dquot_writeback_dquots(sb, -1);
1283
1284 spin_lock(&sbi->s_lock);
1285 if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) {
1286 ext2_debug("setting valid to 0\n");
1287 es->s_state &= cpu_to_le16(~EXT2_VALID_FS);
1288 }
1289 spin_unlock(&sbi->s_lock);
1290 ext2_sync_super(sb, es, wait);
1291 return 0;
1292 }
1293
1294 static int ext2_freeze(struct super_block *sb)
1295 {
1296 struct ext2_sb_info *sbi = EXT2_SB(sb);
1297
1298 /*
1299 * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared
1300 * because we have unattached inodes and thus filesystem is not fully
1301 * consistent.
1302 */
1303 if (atomic_long_read(&sb->s_remove_count)) {
1304 ext2_sync_fs(sb, 1);
1305 return 0;
1306 }
1307 /* Set EXT2_FS_VALID flag */
1308 spin_lock(&sbi->s_lock);
1309 sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state);
1310 spin_unlock(&sbi->s_lock);
1311 ext2_sync_super(sb, sbi->s_es, 1);
1312
1313 return 0;
1314 }
1315
1316 static int ext2_unfreeze(struct super_block *sb)
1317 {
1318 /* Just write sb to clear EXT2_VALID_FS flag */
1319 ext2_write_super(sb);
1320
1321 return 0;
1322 }
1323
1324 static void ext2_write_super(struct super_block *sb)
1325 {
1326 if (!sb_rdonly(sb))
1327 ext2_sync_fs(sb, 1);
1328 }
1329
1330 static int ext2_remount (struct super_block * sb, int * flags, char * data)
1331 {
1332 struct ext2_sb_info * sbi = EXT2_SB(sb);
1333 struct ext2_super_block * es;
1334 struct ext2_mount_options new_opts;
1335 int err;
1336
1337 sync_filesystem(sb);
1338
1339 spin_lock(&sbi->s_lock);
1340 new_opts.s_mount_opt = sbi->s_mount_opt;
1341 new_opts.s_resuid = sbi->s_resuid;
1342 new_opts.s_resgid = sbi->s_resgid;
1343 spin_unlock(&sbi->s_lock);
1344
1345 if (!parse_options(data, sb, &new_opts))
1346 return -EINVAL;
1347
1348 spin_lock(&sbi->s_lock);
1349 es = sbi->s_es;
1350 if ((sbi->s_mount_opt ^ new_opts.s_mount_opt) & EXT2_MOUNT_DAX) {
1351 ext2_msg(sb, KERN_WARNING, "warning: refusing change of "
1352 "dax flag with busy inodes while remounting");
1353 new_opts.s_mount_opt ^= EXT2_MOUNT_DAX;
1354 }
1355 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
1356 goto out_set;
1357 if (*flags & SB_RDONLY) {
1358 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS ||
1359 !(sbi->s_mount_state & EXT2_VALID_FS))
1360 goto out_set;
1361
1362 /*
1363 * OK, we are remounting a valid rw partition rdonly, so set
1364 * the rdonly flag and then mark the partition as valid again.
1365 */
1366 es->s_state = cpu_to_le16(sbi->s_mount_state);
1367 es->s_mtime = cpu_to_le32(ktime_get_real_seconds());
1368 spin_unlock(&sbi->s_lock);
1369
1370 err = dquot_suspend(sb, -1);
1371 if (err < 0)
1372 return err;
1373
1374 ext2_sync_super(sb, es, 1);
1375 } else {
1376 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb,
1377 ~EXT2_FEATURE_RO_COMPAT_SUPP);
1378 if (ret) {
1379 spin_unlock(&sbi->s_lock);
1380 ext2_msg(sb, KERN_WARNING,
1381 "warning: couldn't remount RDWR because of "
1382 "unsupported optional features (%x).",
1383 le32_to_cpu(ret));
1384 return -EROFS;
1385 }
1386 /*
1387 * Mounting a RDONLY partition read-write, so reread and
1388 * store the current valid flag. (It may have been changed
1389 * by e2fsck since we originally mounted the partition.)
1390 */
1391 sbi->s_mount_state = le16_to_cpu(es->s_state);
1392 if (!ext2_setup_super (sb, es, 0))
1393 sb->s_flags &= ~SB_RDONLY;
1394 spin_unlock(&sbi->s_lock);
1395
1396 ext2_write_super(sb);
1397
1398 dquot_resume(sb, -1);
1399 }
1400
1401 spin_lock(&sbi->s_lock);
1402 out_set:
1403 sbi->s_mount_opt = new_opts.s_mount_opt;
1404 sbi->s_resuid = new_opts.s_resuid;
1405 sbi->s_resgid = new_opts.s_resgid;
1406 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
1407 ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? SB_POSIXACL : 0);
1408 spin_unlock(&sbi->s_lock);
1409
1410 return 0;
1411 }
1412
1413 static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf)
1414 {
1415 struct super_block *sb = dentry->d_sb;
1416 struct ext2_sb_info *sbi = EXT2_SB(sb);
1417 struct ext2_super_block *es = sbi->s_es;
1418 u64 fsid;
1419
1420 spin_lock(&sbi->s_lock);
1421
1422 if (test_opt (sb, MINIX_DF))
1423 sbi->s_overhead_last = 0;
1424 else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
1425 unsigned long i, overhead = 0;
1426 smp_rmb();
1427
1428 /*
1429 * Compute the overhead (FS structures). This is constant
1430 * for a given filesystem unless the number of block groups
1431 * changes so we cache the previous value until it does.
1432 */
1433
1434 /*
1435 * All of the blocks before first_data_block are
1436 * overhead
1437 */
1438 overhead = le32_to_cpu(es->s_first_data_block);
1439
1440 /*
1441 * Add the overhead attributed to the superblock and
1442 * block group descriptors. If the sparse superblocks
1443 * feature is turned on, then not all groups have this.
1444 */
1445 for (i = 0; i < sbi->s_groups_count; i++)
1446 overhead += ext2_bg_has_super(sb, i) +
1447 ext2_bg_num_gdb(sb, i);
1448
1449 /*
1450 * Every block group has an inode bitmap, a block
1451 * bitmap, and an inode table.
1452 */
1453 overhead += (sbi->s_groups_count *
1454 (2 + sbi->s_itb_per_group));
1455 sbi->s_overhead_last = overhead;
1456 smp_wmb();
1457 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
1458 }
1459
1460 buf->f_type = EXT2_SUPER_MAGIC;
1461 buf->f_bsize = sb->s_blocksize;
1462 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
1463 buf->f_bfree = ext2_count_free_blocks(sb);
1464 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
1465 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
1466 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
1467 buf->f_bavail = 0;
1468 buf->f_files = le32_to_cpu(es->s_inodes_count);
1469 buf->f_ffree = ext2_count_free_inodes(sb);
1470 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
1471 buf->f_namelen = EXT2_NAME_LEN;
1472 fsid = le64_to_cpup((void *)es->s_uuid) ^
1473 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
1474 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
1475 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
1476 spin_unlock(&sbi->s_lock);
1477 return 0;
1478 }
1479
1480 static struct dentry *ext2_mount(struct file_system_type *fs_type,
1481 int flags, const char *dev_name, void *data)
1482 {
1483 return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super);
1484 }
1485
1486 #ifdef CONFIG_QUOTA
1487
1488 /* Read data from quotafile - avoid pagecache and such because we cannot afford
1489 * acquiring the locks... As quota files are never truncated and quota code
1490 * itself serializes the operations (and no one else should touch the files)
1491 * we don't have to be afraid of races */
1492 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data,
1493 size_t len, loff_t off)
1494 {
1495 struct inode *inode = sb_dqopt(sb)->files[type];
1496 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1497 int err = 0;
1498 int offset = off & (sb->s_blocksize - 1);
1499 int tocopy;
1500 size_t toread;
1501 struct buffer_head tmp_bh;
1502 struct buffer_head *bh;
1503 loff_t i_size = i_size_read(inode);
1504
1505 if (off > i_size)
1506 return 0;
1507 if (off+len > i_size)
1508 len = i_size-off;
1509 toread = len;
1510 while (toread > 0) {
1511 tocopy = sb->s_blocksize - offset < toread ?
1512 sb->s_blocksize - offset : toread;
1513
1514 tmp_bh.b_state = 0;
1515 tmp_bh.b_size = sb->s_blocksize;
1516 err = ext2_get_block(inode, blk, &tmp_bh, 0);
1517 if (err < 0)
1518 return err;
1519 if (!buffer_mapped(&tmp_bh)) /* A hole? */
1520 memset(data, 0, tocopy);
1521 else {
1522 bh = sb_bread(sb, tmp_bh.b_blocknr);
1523 if (!bh)
1524 return -EIO;
1525 memcpy(data, bh->b_data+offset, tocopy);
1526 brelse(bh);
1527 }
1528 offset = 0;
1529 toread -= tocopy;
1530 data += tocopy;
1531 blk++;
1532 }
1533 return len;
1534 }
1535
1536 /* Write to quotafile */
1537 static ssize_t ext2_quota_write(struct super_block *sb, int type,
1538 const char *data, size_t len, loff_t off)
1539 {
1540 struct inode *inode = sb_dqopt(sb)->files[type];
1541 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1542 int err = 0;
1543 int offset = off & (sb->s_blocksize - 1);
1544 int tocopy;
1545 size_t towrite = len;
1546 struct buffer_head tmp_bh;
1547 struct buffer_head *bh;
1548
1549 while (towrite > 0) {
1550 tocopy = sb->s_blocksize - offset < towrite ?
1551 sb->s_blocksize - offset : towrite;
1552
1553 tmp_bh.b_state = 0;
1554 tmp_bh.b_size = sb->s_blocksize;
1555 err = ext2_get_block(inode, blk, &tmp_bh, 1);
1556 if (err < 0)
1557 goto out;
1558 if (offset || tocopy != EXT2_BLOCK_SIZE(sb))
1559 bh = sb_bread(sb, tmp_bh.b_blocknr);
1560 else
1561 bh = sb_getblk(sb, tmp_bh.b_blocknr);
1562 if (unlikely(!bh)) {
1563 err = -EIO;
1564 goto out;
1565 }
1566 lock_buffer(bh);
1567 memcpy(bh->b_data+offset, data, tocopy);
1568 flush_dcache_page(bh->b_page);
1569 set_buffer_uptodate(bh);
1570 mark_buffer_dirty(bh);
1571 unlock_buffer(bh);
1572 brelse(bh);
1573 offset = 0;
1574 towrite -= tocopy;
1575 data += tocopy;
1576 blk++;
1577 }
1578 out:
1579 if (len == towrite)
1580 return err;
1581 if (inode->i_size < off+len-towrite)
1582 i_size_write(inode, off+len-towrite);
1583 inode_inc_iversion(inode);
1584 inode->i_mtime = inode->i_ctime = current_time(inode);
1585 mark_inode_dirty(inode);
1586 return len - towrite;
1587 }
1588
1589 static int ext2_quota_on(struct super_block *sb, int type, int format_id,
1590 const struct path *path)
1591 {
1592 int err;
1593 struct inode *inode;
1594
1595 err = dquot_quota_on(sb, type, format_id, path);
1596 if (err)
1597 return err;
1598
1599 inode = d_inode(path->dentry);
1600 inode_lock(inode);
1601 EXT2_I(inode)->i_flags |= EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL;
1602 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
1603 S_NOATIME | S_IMMUTABLE);
1604 inode_unlock(inode);
1605 mark_inode_dirty(inode);
1606
1607 return 0;
1608 }
1609
1610 static int ext2_quota_off(struct super_block *sb, int type)
1611 {
1612 struct inode *inode = sb_dqopt(sb)->files[type];
1613 int err;
1614
1615 if (!inode || !igrab(inode))
1616 goto out;
1617
1618 err = dquot_quota_off(sb, type);
1619 if (err)
1620 goto out_put;
1621
1622 inode_lock(inode);
1623 EXT2_I(inode)->i_flags &= ~(EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL);
1624 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
1625 inode_unlock(inode);
1626 mark_inode_dirty(inode);
1627 out_put:
1628 iput(inode);
1629 return err;
1630 out:
1631 return dquot_quota_off(sb, type);
1632 }
1633
1634 #endif
1635
1636 static struct file_system_type ext2_fs_type = {
1637 .owner = THIS_MODULE,
1638 .name = "ext2",
1639 .mount = ext2_mount,
1640 .kill_sb = kill_block_super,
1641 .fs_flags = FS_REQUIRES_DEV,
1642 };
1643 MODULE_ALIAS_FS("ext2");
1644
1645 static int __init init_ext2_fs(void)
1646 {
1647 int err;
1648
1649 err = init_inodecache();
1650 if (err)
1651 return err;
1652 err = register_filesystem(&ext2_fs_type);
1653 if (err)
1654 goto out;
1655 return 0;
1656 out:
1657 destroy_inodecache();
1658 return err;
1659 }
1660
1661 static void __exit exit_ext2_fs(void)
1662 {
1663 unregister_filesystem(&ext2_fs_type);
1664 destroy_inodecache();
1665 }
1666
1667 MODULE_AUTHOR("Remy Card and others");
1668 MODULE_DESCRIPTION("Second Extended Filesystem");
1669 MODULE_LICENSE("GPL");
1670 module_init(init_ext2_fs)
1671 module_exit(exit_ext2_fs)
Mirror of linux-2.6-arm at arm.linux.org.uk