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Merge tag 'mmc-v4.15-2' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc
[mirror_ubuntu-bionic-kernel.git] / fs / ext2 / super.c
1 /*
2 * linux/fs/ext2/super.c
3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19 #include <linux/module.h>
20 #include <linux/string.h>
21 #include <linux/fs.h>
22 #include <linux/slab.h>
23 #include <linux/init.h>
24 #include <linux/blkdev.h>
25 #include <linux/parser.h>
26 #include <linux/random.h>
27 #include <linux/buffer_head.h>
28 #include <linux/exportfs.h>
29 #include <linux/vfs.h>
30 #include <linux/seq_file.h>
31 #include <linux/mount.h>
32 #include <linux/log2.h>
33 #include <linux/quotaops.h>
34 #include <linux/uaccess.h>
35 #include <linux/dax.h>
36 #include "ext2.h"
37 #include "xattr.h"
38 #include "acl.h"
39
40 static void ext2_write_super(struct super_block *sb);
41 static int ext2_remount (struct super_block * sb, int * flags, char * data);
42 static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf);
43 static int ext2_sync_fs(struct super_block *sb, int wait);
44 static int ext2_freeze(struct super_block *sb);
45 static int ext2_unfreeze(struct super_block *sb);
46
47 void ext2_error(struct super_block *sb, const char *function,
48 const char *fmt, ...)
49 {
50 struct va_format vaf;
51 va_list args;
52 struct ext2_sb_info *sbi = EXT2_SB(sb);
53 struct ext2_super_block *es = sbi->s_es;
54
55 if (!sb_rdonly(sb)) {
56 spin_lock(&sbi->s_lock);
57 sbi->s_mount_state |= EXT2_ERROR_FS;
58 es->s_state |= cpu_to_le16(EXT2_ERROR_FS);
59 spin_unlock(&sbi->s_lock);
60 ext2_sync_super(sb, es, 1);
61 }
62
63 va_start(args, fmt);
64
65 vaf.fmt = fmt;
66 vaf.va = &args;
67
68 printk(KERN_CRIT "EXT2-fs (%s): error: %s: %pV\n",
69 sb->s_id, function, &vaf);
70
71 va_end(args);
72
73 if (test_opt(sb, ERRORS_PANIC))
74 panic("EXT2-fs: panic from previous error\n");
75 if (test_opt(sb, ERRORS_RO)) {
76 ext2_msg(sb, KERN_CRIT,
77 "error: remounting filesystem read-only");
78 sb->s_flags |= SB_RDONLY;
79 }
80 }
81
82 void ext2_msg(struct super_block *sb, const char *prefix,
83 const char *fmt, ...)
84 {
85 struct va_format vaf;
86 va_list args;
87
88 va_start(args, fmt);
89
90 vaf.fmt = fmt;
91 vaf.va = &args;
92
93 printk("%sEXT2-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
94
95 va_end(args);
96 }
97
98 /*
99 * This must be called with sbi->s_lock held.
100 */
101 void ext2_update_dynamic_rev(struct super_block *sb)
102 {
103 struct ext2_super_block *es = EXT2_SB(sb)->s_es;
104
105 if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV)
106 return;
107
108 ext2_msg(sb, KERN_WARNING,
109 "warning: updating to rev %d because of "
110 "new feature flag, running e2fsck is recommended",
111 EXT2_DYNAMIC_REV);
112
113 es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO);
114 es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE);
115 es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV);
116 /* leave es->s_feature_*compat flags alone */
117 /* es->s_uuid will be set by e2fsck if empty */
118
119 /*
120 * The rest of the superblock fields should be zero, and if not it
121 * means they are likely already in use, so leave them alone. We
122 * can leave it up to e2fsck to clean up any inconsistencies there.
123 */
124 }
125
126 #ifdef CONFIG_QUOTA
127 static int ext2_quota_off(struct super_block *sb, int type);
128
129 static void ext2_quota_off_umount(struct super_block *sb)
130 {
131 int type;
132
133 for (type = 0; type < MAXQUOTAS; type++)
134 ext2_quota_off(sb, type);
135 }
136 #else
137 static inline void ext2_quota_off_umount(struct super_block *sb)
138 {
139 }
140 #endif
141
142 static void ext2_put_super (struct super_block * sb)
143 {
144 int db_count;
145 int i;
146 struct ext2_sb_info *sbi = EXT2_SB(sb);
147
148 ext2_quota_off_umount(sb);
149
150 if (sbi->s_ea_block_cache) {
151 ext2_xattr_destroy_cache(sbi->s_ea_block_cache);
152 sbi->s_ea_block_cache = NULL;
153 }
154 if (!sb_rdonly(sb)) {
155 struct ext2_super_block *es = sbi->s_es;
156
157 spin_lock(&sbi->s_lock);
158 es->s_state = cpu_to_le16(sbi->s_mount_state);
159 spin_unlock(&sbi->s_lock);
160 ext2_sync_super(sb, es, 1);
161 }
162 db_count = sbi->s_gdb_count;
163 for (i = 0; i < db_count; i++)
164 if (sbi->s_group_desc[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 ei->vfs_inode.i_version = 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_i_callback(struct rcu_head *head)
196 {
197 struct inode *inode = container_of(head, struct inode, i_rcu);
198 kmem_cache_free(ext2_inode_cachep, EXT2_I(inode));
199 }
200
201 static void ext2_destroy_inode(struct inode *inode)
202 {
203 call_rcu(&inode->i_rcu, ext2_i_callback);
204 }
205
206 static void init_once(void *foo)
207 {
208 struct ext2_inode_info *ei = (struct ext2_inode_info *) foo;
209
210 rwlock_init(&ei->i_meta_lock);
211 #ifdef CONFIG_EXT2_FS_XATTR
212 init_rwsem(&ei->xattr_sem);
213 #endif
214 mutex_init(&ei->truncate_mutex);
215 #ifdef CONFIG_FS_DAX
216 init_rwsem(&ei->dax_sem);
217 #endif
218 inode_init_once(&ei->vfs_inode);
219 }
220
221 static int __init init_inodecache(void)
222 {
223 ext2_inode_cachep = kmem_cache_create("ext2_inode_cache",
224 sizeof(struct ext2_inode_info),
225 0, (SLAB_RECLAIM_ACCOUNT|
226 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
227 init_once);
228 if (ext2_inode_cachep == NULL)
229 return -ENOMEM;
230 return 0;
231 }
232
233 static void destroy_inodecache(void)
234 {
235 /*
236 * Make sure all delayed rcu free inodes are flushed before we
237 * destroy cache.
238 */
239 rcu_barrier();
240 kmem_cache_destroy(ext2_inode_cachep);
241 }
242
243 static int ext2_show_options(struct seq_file *seq, struct dentry *root)
244 {
245 struct super_block *sb = root->d_sb;
246 struct ext2_sb_info *sbi = EXT2_SB(sb);
247 struct ext2_super_block *es = sbi->s_es;
248 unsigned long def_mount_opts;
249
250 spin_lock(&sbi->s_lock);
251 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
252
253 if (sbi->s_sb_block != 1)
254 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
255 if (test_opt(sb, MINIX_DF))
256 seq_puts(seq, ",minixdf");
257 if (test_opt(sb, GRPID))
258 seq_puts(seq, ",grpid");
259 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS))
260 seq_puts(seq, ",nogrpid");
261 if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT2_DEF_RESUID)) ||
262 le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) {
263 seq_printf(seq, ",resuid=%u",
264 from_kuid_munged(&init_user_ns, sbi->s_resuid));
265 }
266 if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT2_DEF_RESGID)) ||
267 le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) {
268 seq_printf(seq, ",resgid=%u",
269 from_kgid_munged(&init_user_ns, sbi->s_resgid));
270 }
271 if (test_opt(sb, ERRORS_RO)) {
272 int def_errors = le16_to_cpu(es->s_errors);
273
274 if (def_errors == EXT2_ERRORS_PANIC ||
275 def_errors == EXT2_ERRORS_CONTINUE) {
276 seq_puts(seq, ",errors=remount-ro");
277 }
278 }
279 if (test_opt(sb, ERRORS_CONT))
280 seq_puts(seq, ",errors=continue");
281 if (test_opt(sb, ERRORS_PANIC))
282 seq_puts(seq, ",errors=panic");
283 if (test_opt(sb, NO_UID32))
284 seq_puts(seq, ",nouid32");
285 if (test_opt(sb, DEBUG))
286 seq_puts(seq, ",debug");
287 if (test_opt(sb, OLDALLOC))
288 seq_puts(seq, ",oldalloc");
289
290 #ifdef CONFIG_EXT2_FS_XATTR
291 if (test_opt(sb, XATTR_USER))
292 seq_puts(seq, ",user_xattr");
293 if (!test_opt(sb, XATTR_USER) &&
294 (def_mount_opts & EXT2_DEFM_XATTR_USER)) {
295 seq_puts(seq, ",nouser_xattr");
296 }
297 #endif
298
299 #ifdef CONFIG_EXT2_FS_POSIX_ACL
300 if (test_opt(sb, POSIX_ACL))
301 seq_puts(seq, ",acl");
302 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL))
303 seq_puts(seq, ",noacl");
304 #endif
305
306 if (test_opt(sb, NOBH))
307 seq_puts(seq, ",nobh");
308
309 #if defined(CONFIG_QUOTA)
310 if (sbi->s_mount_opt & EXT2_MOUNT_USRQUOTA)
311 seq_puts(seq, ",usrquota");
312
313 if (sbi->s_mount_opt & EXT2_MOUNT_GRPQUOTA)
314 seq_puts(seq, ",grpquota");
315 #endif
316
317 #ifdef CONFIG_FS_DAX
318 if (sbi->s_mount_opt & EXT2_MOUNT_XIP)
319 seq_puts(seq, ",xip");
320 if (sbi->s_mount_opt & EXT2_MOUNT_DAX)
321 seq_puts(seq, ",dax");
322 #endif
323
324 if (!test_opt(sb, RESERVATION))
325 seq_puts(seq, ",noreservation");
326
327 spin_unlock(&sbi->s_lock);
328 return 0;
329 }
330
331 #ifdef CONFIG_QUOTA
332 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off);
333 static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off);
334 static int ext2_quota_on(struct super_block *sb, int type, int format_id,
335 const struct path *path);
336 static struct dquot **ext2_get_dquots(struct inode *inode)
337 {
338 return EXT2_I(inode)->i_dquot;
339 }
340
341 static const struct quotactl_ops ext2_quotactl_ops = {
342 .quota_on = ext2_quota_on,
343 .quota_off = ext2_quota_off,
344 .quota_sync = dquot_quota_sync,
345 .get_state = dquot_get_state,
346 .set_info = dquot_set_dqinfo,
347 .get_dqblk = dquot_get_dqblk,
348 .set_dqblk = dquot_set_dqblk,
349 .get_nextdqblk = dquot_get_next_dqblk,
350 };
351 #endif
352
353 static const struct super_operations ext2_sops = {
354 .alloc_inode = ext2_alloc_inode,
355 .destroy_inode = ext2_destroy_inode,
356 .write_inode = ext2_write_inode,
357 .evict_inode = ext2_evict_inode,
358 .put_super = ext2_put_super,
359 .sync_fs = ext2_sync_fs,
360 .freeze_fs = ext2_freeze,
361 .unfreeze_fs = ext2_unfreeze,
362 .statfs = ext2_statfs,
363 .remount_fs = ext2_remount,
364 .show_options = ext2_show_options,
365 #ifdef CONFIG_QUOTA
366 .quota_read = ext2_quota_read,
367 .quota_write = ext2_quota_write,
368 .get_dquots = ext2_get_dquots,
369 #endif
370 };
371
372 static struct inode *ext2_nfs_get_inode(struct super_block *sb,
373 u64 ino, u32 generation)
374 {
375 struct inode *inode;
376
377 if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO)
378 return ERR_PTR(-ESTALE);
379 if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count))
380 return ERR_PTR(-ESTALE);
381
382 /*
383 * ext2_iget isn't quite right if the inode is currently unallocated!
384 * However ext2_iget currently does appropriate checks to handle stale
385 * inodes so everything is OK.
386 */
387 inode = ext2_iget(sb, ino);
388 if (IS_ERR(inode))
389 return ERR_CAST(inode);
390 if (generation && inode->i_generation != generation) {
391 /* we didn't find the right inode.. */
392 iput(inode);
393 return ERR_PTR(-ESTALE);
394 }
395 return inode;
396 }
397
398 static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid,
399 int fh_len, int fh_type)
400 {
401 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
402 ext2_nfs_get_inode);
403 }
404
405 static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid,
406 int fh_len, int fh_type)
407 {
408 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
409 ext2_nfs_get_inode);
410 }
411
412 static const struct export_operations ext2_export_ops = {
413 .fh_to_dentry = ext2_fh_to_dentry,
414 .fh_to_parent = ext2_fh_to_parent,
415 .get_parent = ext2_get_parent,
416 };
417
418 static unsigned long get_sb_block(void **data)
419 {
420 unsigned long sb_block;
421 char *options = (char *) *data;
422
423 if (!options || strncmp(options, "sb=", 3) != 0)
424 return 1; /* Default location */
425 options += 3;
426 sb_block = simple_strtoul(options, &options, 0);
427 if (*options && *options != ',') {
428 printk("EXT2-fs: Invalid sb specification: %s\n",
429 (char *) *data);
430 return 1;
431 }
432 if (*options == ',')
433 options++;
434 *data = (void *) options;
435 return sb_block;
436 }
437
438 enum {
439 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
440 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic,
441 Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug,
442 Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr,
443 Opt_acl, Opt_noacl, Opt_xip, Opt_dax, Opt_ignore, Opt_err, Opt_quota,
444 Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation
445 };
446
447 static const match_table_t tokens = {
448 {Opt_bsd_df, "bsddf"},
449 {Opt_minix_df, "minixdf"},
450 {Opt_grpid, "grpid"},
451 {Opt_grpid, "bsdgroups"},
452 {Opt_nogrpid, "nogrpid"},
453 {Opt_nogrpid, "sysvgroups"},
454 {Opt_resgid, "resgid=%u"},
455 {Opt_resuid, "resuid=%u"},
456 {Opt_sb, "sb=%u"},
457 {Opt_err_cont, "errors=continue"},
458 {Opt_err_panic, "errors=panic"},
459 {Opt_err_ro, "errors=remount-ro"},
460 {Opt_nouid32, "nouid32"},
461 {Opt_nocheck, "check=none"},
462 {Opt_nocheck, "nocheck"},
463 {Opt_debug, "debug"},
464 {Opt_oldalloc, "oldalloc"},
465 {Opt_orlov, "orlov"},
466 {Opt_nobh, "nobh"},
467 {Opt_user_xattr, "user_xattr"},
468 {Opt_nouser_xattr, "nouser_xattr"},
469 {Opt_acl, "acl"},
470 {Opt_noacl, "noacl"},
471 {Opt_xip, "xip"},
472 {Opt_dax, "dax"},
473 {Opt_grpquota, "grpquota"},
474 {Opt_ignore, "noquota"},
475 {Opt_quota, "quota"},
476 {Opt_usrquota, "usrquota"},
477 {Opt_reservation, "reservation"},
478 {Opt_noreservation, "noreservation"},
479 {Opt_err, NULL}
480 };
481
482 static int parse_options(char *options, struct super_block *sb,
483 struct ext2_mount_options *opts)
484 {
485 char *p;
486 substring_t args[MAX_OPT_ARGS];
487 int option;
488 kuid_t uid;
489 kgid_t gid;
490
491 if (!options)
492 return 1;
493
494 while ((p = strsep (&options, ",")) != NULL) {
495 int token;
496 if (!*p)
497 continue;
498
499 token = match_token(p, tokens, args);
500 switch (token) {
501 case Opt_bsd_df:
502 clear_opt (opts->s_mount_opt, MINIX_DF);
503 break;
504 case Opt_minix_df:
505 set_opt (opts->s_mount_opt, MINIX_DF);
506 break;
507 case Opt_grpid:
508 set_opt (opts->s_mount_opt, GRPID);
509 break;
510 case Opt_nogrpid:
511 clear_opt (opts->s_mount_opt, GRPID);
512 break;
513 case Opt_resuid:
514 if (match_int(&args[0], &option))
515 return 0;
516 uid = make_kuid(current_user_ns(), option);
517 if (!uid_valid(uid)) {
518 ext2_msg(sb, KERN_ERR, "Invalid uid value %d", option);
519 return 0;
520
521 }
522 opts->s_resuid = uid;
523 break;
524 case Opt_resgid:
525 if (match_int(&args[0], &option))
526 return 0;
527 gid = make_kgid(current_user_ns(), option);
528 if (!gid_valid(gid)) {
529 ext2_msg(sb, KERN_ERR, "Invalid gid value %d", option);
530 return 0;
531 }
532 opts->s_resgid = gid;
533 break;
534 case Opt_sb:
535 /* handled by get_sb_block() instead of here */
536 /* *sb_block = match_int(&args[0]); */
537 break;
538 case Opt_err_panic:
539 clear_opt (opts->s_mount_opt, ERRORS_CONT);
540 clear_opt (opts->s_mount_opt, ERRORS_RO);
541 set_opt (opts->s_mount_opt, ERRORS_PANIC);
542 break;
543 case Opt_err_ro:
544 clear_opt (opts->s_mount_opt, ERRORS_CONT);
545 clear_opt (opts->s_mount_opt, ERRORS_PANIC);
546 set_opt (opts->s_mount_opt, ERRORS_RO);
547 break;
548 case Opt_err_cont:
549 clear_opt (opts->s_mount_opt, ERRORS_RO);
550 clear_opt (opts->s_mount_opt, ERRORS_PANIC);
551 set_opt (opts->s_mount_opt, ERRORS_CONT);
552 break;
553 case Opt_nouid32:
554 set_opt (opts->s_mount_opt, NO_UID32);
555 break;
556 case Opt_nocheck:
557 clear_opt (opts->s_mount_opt, CHECK);
558 break;
559 case Opt_debug:
560 set_opt (opts->s_mount_opt, DEBUG);
561 break;
562 case Opt_oldalloc:
563 set_opt (opts->s_mount_opt, OLDALLOC);
564 break;
565 case Opt_orlov:
566 clear_opt (opts->s_mount_opt, OLDALLOC);
567 break;
568 case Opt_nobh:
569 set_opt (opts->s_mount_opt, NOBH);
570 break;
571 #ifdef CONFIG_EXT2_FS_XATTR
572 case Opt_user_xattr:
573 set_opt (opts->s_mount_opt, XATTR_USER);
574 break;
575 case Opt_nouser_xattr:
576 clear_opt (opts->s_mount_opt, XATTR_USER);
577 break;
578 #else
579 case Opt_user_xattr:
580 case Opt_nouser_xattr:
581 ext2_msg(sb, KERN_INFO, "(no)user_xattr options"
582 "not supported");
583 break;
584 #endif
585 #ifdef CONFIG_EXT2_FS_POSIX_ACL
586 case Opt_acl:
587 set_opt(opts->s_mount_opt, POSIX_ACL);
588 break;
589 case Opt_noacl:
590 clear_opt(opts->s_mount_opt, POSIX_ACL);
591 break;
592 #else
593 case Opt_acl:
594 case Opt_noacl:
595 ext2_msg(sb, KERN_INFO,
596 "(no)acl options not supported");
597 break;
598 #endif
599 case Opt_xip:
600 ext2_msg(sb, KERN_INFO, "use dax instead of xip");
601 set_opt(opts->s_mount_opt, XIP);
602 /* Fall through */
603 case Opt_dax:
604 #ifdef CONFIG_FS_DAX
605 ext2_msg(sb, KERN_WARNING,
606 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
607 set_opt(opts->s_mount_opt, DAX);
608 #else
609 ext2_msg(sb, KERN_INFO, "dax option not supported");
610 #endif
611 break;
612
613 #if defined(CONFIG_QUOTA)
614 case Opt_quota:
615 case Opt_usrquota:
616 set_opt(opts->s_mount_opt, USRQUOTA);
617 break;
618
619 case Opt_grpquota:
620 set_opt(opts->s_mount_opt, GRPQUOTA);
621 break;
622 #else
623 case Opt_quota:
624 case Opt_usrquota:
625 case Opt_grpquota:
626 ext2_msg(sb, KERN_INFO,
627 "quota operations not supported");
628 break;
629 #endif
630
631 case Opt_reservation:
632 set_opt(opts->s_mount_opt, RESERVATION);
633 ext2_msg(sb, KERN_INFO, "reservations ON");
634 break;
635 case Opt_noreservation:
636 clear_opt(opts->s_mount_opt, RESERVATION);
637 ext2_msg(sb, KERN_INFO, "reservations OFF");
638 break;
639 case Opt_ignore:
640 break;
641 default:
642 return 0;
643 }
644 }
645 return 1;
646 }
647
648 static int ext2_setup_super (struct super_block * sb,
649 struct ext2_super_block * es,
650 int read_only)
651 {
652 int res = 0;
653 struct ext2_sb_info *sbi = EXT2_SB(sb);
654
655 if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) {
656 ext2_msg(sb, KERN_ERR,
657 "error: revision level too high, "
658 "forcing read-only mode");
659 res = SB_RDONLY;
660 }
661 if (read_only)
662 return res;
663 if (!(sbi->s_mount_state & EXT2_VALID_FS))
664 ext2_msg(sb, KERN_WARNING,
665 "warning: mounting unchecked fs, "
666 "running e2fsck is recommended");
667 else if ((sbi->s_mount_state & EXT2_ERROR_FS))
668 ext2_msg(sb, KERN_WARNING,
669 "warning: mounting fs with errors, "
670 "running e2fsck is recommended");
671 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
672 le16_to_cpu(es->s_mnt_count) >=
673 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
674 ext2_msg(sb, KERN_WARNING,
675 "warning: maximal mount count reached, "
676 "running e2fsck is recommended");
677 else if (le32_to_cpu(es->s_checkinterval) &&
678 (le32_to_cpu(es->s_lastcheck) +
679 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
680 ext2_msg(sb, KERN_WARNING,
681 "warning: checktime reached, "
682 "running e2fsck is recommended");
683 if (!le16_to_cpu(es->s_max_mnt_count))
684 es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT);
685 le16_add_cpu(&es->s_mnt_count, 1);
686 if (test_opt (sb, DEBUG))
687 ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, fs=%lu, gc=%lu, "
688 "bpg=%lu, ipg=%lu, mo=%04lx]",
689 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize,
690 sbi->s_frag_size,
691 sbi->s_groups_count,
692 EXT2_BLOCKS_PER_GROUP(sb),
693 EXT2_INODES_PER_GROUP(sb),
694 sbi->s_mount_opt);
695 return res;
696 }
697
698 static int ext2_check_descriptors(struct super_block *sb)
699 {
700 int i;
701 struct ext2_sb_info *sbi = EXT2_SB(sb);
702
703 ext2_debug ("Checking group descriptors");
704
705 for (i = 0; i < sbi->s_groups_count; i++) {
706 struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL);
707 ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i);
708 ext2_fsblk_t last_block;
709
710 if (i == sbi->s_groups_count - 1)
711 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
712 else
713 last_block = first_block +
714 (EXT2_BLOCKS_PER_GROUP(sb) - 1);
715
716 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
717 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
718 {
719 ext2_error (sb, "ext2_check_descriptors",
720 "Block bitmap for group %d"
721 " not in group (block %lu)!",
722 i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap));
723 return 0;
724 }
725 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
726 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
727 {
728 ext2_error (sb, "ext2_check_descriptors",
729 "Inode bitmap for group %d"
730 " not in group (block %lu)!",
731 i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap));
732 return 0;
733 }
734 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
735 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
736 last_block)
737 {
738 ext2_error (sb, "ext2_check_descriptors",
739 "Inode table for group %d"
740 " not in group (block %lu)!",
741 i, (unsigned long) le32_to_cpu(gdp->bg_inode_table));
742 return 0;
743 }
744 }
745 return 1;
746 }
747
748 /*
749 * Maximal file size. There is a direct, and {,double-,triple-}indirect
750 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
751 * We need to be 1 filesystem block less than the 2^32 sector limit.
752 */
753 static loff_t ext2_max_size(int bits)
754 {
755 loff_t res = EXT2_NDIR_BLOCKS;
756 int meta_blocks;
757 loff_t upper_limit;
758
759 /* This is calculated to be the largest file size for a
760 * dense, file such that the total number of
761 * sectors in the file, including data and all indirect blocks,
762 * does not exceed 2^32 -1
763 * __u32 i_blocks representing the total number of
764 * 512 bytes blocks of the file
765 */
766 upper_limit = (1LL << 32) - 1;
767
768 /* total blocks in file system block size */
769 upper_limit >>= (bits - 9);
770
771
772 /* indirect blocks */
773 meta_blocks = 1;
774 /* double indirect blocks */
775 meta_blocks += 1 + (1LL << (bits-2));
776 /* tripple indirect blocks */
777 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
778
779 upper_limit -= meta_blocks;
780 upper_limit <<= bits;
781
782 res += 1LL << (bits-2);
783 res += 1LL << (2*(bits-2));
784 res += 1LL << (3*(bits-2));
785 res <<= bits;
786 if (res > upper_limit)
787 res = upper_limit;
788
789 if (res > MAX_LFS_FILESIZE)
790 res = MAX_LFS_FILESIZE;
791
792 return res;
793 }
794
795 static unsigned long descriptor_loc(struct super_block *sb,
796 unsigned long logic_sb_block,
797 int nr)
798 {
799 struct ext2_sb_info *sbi = EXT2_SB(sb);
800 unsigned long bg, first_meta_bg;
801 int has_super = 0;
802
803 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
804
805 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) ||
806 nr < first_meta_bg)
807 return (logic_sb_block + nr + 1);
808 bg = sbi->s_desc_per_block * nr;
809 if (ext2_bg_has_super(sb, bg))
810 has_super = 1;
811
812 return ext2_group_first_block_no(sb, bg) + has_super;
813 }
814
815 static int ext2_fill_super(struct super_block *sb, void *data, int silent)
816 {
817 struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev);
818 struct buffer_head * bh;
819 struct ext2_sb_info * sbi;
820 struct ext2_super_block * es;
821 struct inode *root;
822 unsigned long block;
823 unsigned long sb_block = get_sb_block(&data);
824 unsigned long logic_sb_block;
825 unsigned long offset = 0;
826 unsigned long def_mount_opts;
827 long ret = -EINVAL;
828 int blocksize = BLOCK_SIZE;
829 int db_count;
830 int i, j;
831 __le32 features;
832 int err;
833 struct ext2_mount_options opts;
834
835 err = -ENOMEM;
836 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
837 if (!sbi)
838 goto failed;
839
840 sbi->s_blockgroup_lock =
841 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
842 if (!sbi->s_blockgroup_lock) {
843 kfree(sbi);
844 goto failed;
845 }
846 sb->s_fs_info = sbi;
847 sbi->s_sb_block = sb_block;
848 sbi->s_daxdev = dax_dev;
849
850 spin_lock_init(&sbi->s_lock);
851
852 /*
853 * See what the current blocksize for the device is, and
854 * use that as the blocksize. Otherwise (or if the blocksize
855 * is smaller than the default) use the default.
856 * This is important for devices that have a hardware
857 * sectorsize that is larger than the default.
858 */
859 blocksize = sb_min_blocksize(sb, BLOCK_SIZE);
860 if (!blocksize) {
861 ext2_msg(sb, KERN_ERR, "error: unable to set blocksize");
862 goto failed_sbi;
863 }
864
865 /*
866 * If the superblock doesn't start on a hardware sector boundary,
867 * calculate the offset.
868 */
869 if (blocksize != BLOCK_SIZE) {
870 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
871 offset = (sb_block*BLOCK_SIZE) % blocksize;
872 } else {
873 logic_sb_block = sb_block;
874 }
875
876 if (!(bh = sb_bread(sb, logic_sb_block))) {
877 ext2_msg(sb, KERN_ERR, "error: unable to read superblock");
878 goto failed_sbi;
879 }
880 /*
881 * Note: s_es must be initialized as soon as possible because
882 * some ext2 macro-instructions depend on its value
883 */
884 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
885 sbi->s_es = es;
886 sb->s_magic = le16_to_cpu(es->s_magic);
887
888 if (sb->s_magic != EXT2_SUPER_MAGIC)
889 goto cantfind_ext2;
890
891 /* Set defaults before we parse the mount options */
892 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
893 if (def_mount_opts & EXT2_DEFM_DEBUG)
894 set_opt(opts.s_mount_opt, DEBUG);
895 if (def_mount_opts & EXT2_DEFM_BSDGROUPS)
896 set_opt(opts.s_mount_opt, GRPID);
897 if (def_mount_opts & EXT2_DEFM_UID16)
898 set_opt(opts.s_mount_opt, NO_UID32);
899 #ifdef CONFIG_EXT2_FS_XATTR
900 if (def_mount_opts & EXT2_DEFM_XATTR_USER)
901 set_opt(opts.s_mount_opt, XATTR_USER);
902 #endif
903 #ifdef CONFIG_EXT2_FS_POSIX_ACL
904 if (def_mount_opts & EXT2_DEFM_ACL)
905 set_opt(opts.s_mount_opt, POSIX_ACL);
906 #endif
907
908 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
909 set_opt(opts.s_mount_opt, ERRORS_PANIC);
910 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE)
911 set_opt(opts.s_mount_opt, ERRORS_CONT);
912 else
913 set_opt(opts.s_mount_opt, ERRORS_RO);
914
915 opts.s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
916 opts.s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
917
918 set_opt(opts.s_mount_opt, RESERVATION);
919
920 if (!parse_options((char *) data, sb, &opts))
921 goto failed_mount;
922
923 sbi->s_mount_opt = opts.s_mount_opt;
924 sbi->s_resuid = opts.s_resuid;
925 sbi->s_resgid = opts.s_resgid;
926
927 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
928 ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ?
929 SB_POSIXACL : 0);
930 sb->s_iflags |= SB_I_CGROUPWB;
931
932 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV &&
933 (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) ||
934 EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
935 EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U)))
936 ext2_msg(sb, KERN_WARNING,
937 "warning: feature flags set on rev 0 fs, "
938 "running e2fsck is recommended");
939 /*
940 * Check feature flags regardless of the revision level, since we
941 * previously didn't change the revision level when setting the flags,
942 * so there is a chance incompat flags are set on a rev 0 filesystem.
943 */
944 features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP);
945 if (features) {
946 ext2_msg(sb, KERN_ERR, "error: couldn't mount because of "
947 "unsupported optional features (%x)",
948 le32_to_cpu(features));
949 goto failed_mount;
950 }
951 if (!sb_rdonly(sb) && (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){
952 ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of "
953 "unsupported optional features (%x)",
954 le32_to_cpu(features));
955 goto failed_mount;
956 }
957
958 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
959
960 if (sbi->s_mount_opt & EXT2_MOUNT_DAX) {
961 err = bdev_dax_supported(sb, blocksize);
962 if (err)
963 goto failed_mount;
964 }
965
966 /* If the blocksize doesn't match, re-read the thing.. */
967 if (sb->s_blocksize != blocksize) {
968 brelse(bh);
969
970 if (!sb_set_blocksize(sb, blocksize)) {
971 ext2_msg(sb, KERN_ERR,
972 "error: bad blocksize %d", blocksize);
973 goto failed_sbi;
974 }
975
976 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
977 offset = (sb_block*BLOCK_SIZE) % blocksize;
978 bh = sb_bread(sb, logic_sb_block);
979 if(!bh) {
980 ext2_msg(sb, KERN_ERR, "error: couldn't read"
981 "superblock on 2nd try");
982 goto failed_sbi;
983 }
984 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
985 sbi->s_es = es;
986 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) {
987 ext2_msg(sb, KERN_ERR, "error: magic mismatch");
988 goto failed_mount;
989 }
990 }
991
992 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits);
993 sb->s_max_links = EXT2_LINK_MAX;
994
995 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) {
996 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
997 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
998 } else {
999 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1000 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1001 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) ||
1002 !is_power_of_2(sbi->s_inode_size) ||
1003 (sbi->s_inode_size > blocksize)) {
1004 ext2_msg(sb, KERN_ERR,
1005 "error: unsupported inode size: %d",
1006 sbi->s_inode_size);
1007 goto failed_mount;
1008 }
1009 }
1010
1011 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE <<
1012 le32_to_cpu(es->s_log_frag_size);
1013 if (sbi->s_frag_size == 0)
1014 goto cantfind_ext2;
1015 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size;
1016
1017 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1018 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1019 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1020
1021 if (EXT2_INODE_SIZE(sb) == 0)
1022 goto cantfind_ext2;
1023 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb);
1024 if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0)
1025 goto cantfind_ext2;
1026 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1027 sbi->s_inodes_per_block;
1028 sbi->s_desc_per_block = sb->s_blocksize /
1029 sizeof (struct ext2_group_desc);
1030 sbi->s_sbh = bh;
1031 sbi->s_mount_state = le16_to_cpu(es->s_state);
1032 sbi->s_addr_per_block_bits =
1033 ilog2 (EXT2_ADDR_PER_BLOCK(sb));
1034 sbi->s_desc_per_block_bits =
1035 ilog2 (EXT2_DESC_PER_BLOCK(sb));
1036
1037 if (sb->s_magic != EXT2_SUPER_MAGIC)
1038 goto cantfind_ext2;
1039
1040 if (sb->s_blocksize != bh->b_size) {
1041 if (!silent)
1042 ext2_msg(sb, KERN_ERR, "error: unsupported blocksize");
1043 goto failed_mount;
1044 }
1045
1046 if (sb->s_blocksize != sbi->s_frag_size) {
1047 ext2_msg(sb, KERN_ERR,
1048 "error: fragsize %lu != blocksize %lu"
1049 "(not supported yet)",
1050 sbi->s_frag_size, sb->s_blocksize);
1051 goto failed_mount;
1052 }
1053
1054 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) {
1055 ext2_msg(sb, KERN_ERR,
1056 "error: #blocks per group too big: %lu",
1057 sbi->s_blocks_per_group);
1058 goto failed_mount;
1059 }
1060 if (sbi->s_frags_per_group > sb->s_blocksize * 8) {
1061 ext2_msg(sb, KERN_ERR,
1062 "error: #fragments per group too big: %lu",
1063 sbi->s_frags_per_group);
1064 goto failed_mount;
1065 }
1066 if (sbi->s_inodes_per_group > sb->s_blocksize * 8) {
1067 ext2_msg(sb, KERN_ERR,
1068 "error: #inodes per group too big: %lu",
1069 sbi->s_inodes_per_group);
1070 goto failed_mount;
1071 }
1072
1073 if (EXT2_BLOCKS_PER_GROUP(sb) == 0)
1074 goto cantfind_ext2;
1075 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1076 le32_to_cpu(es->s_first_data_block) - 1)
1077 / EXT2_BLOCKS_PER_GROUP(sb)) + 1;
1078 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
1079 EXT2_DESC_PER_BLOCK(sb);
1080 sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL);
1081 if (sbi->s_group_desc == NULL) {
1082 ext2_msg(sb, KERN_ERR, "error: not enough memory");
1083 goto failed_mount;
1084 }
1085 bgl_lock_init(sbi->s_blockgroup_lock);
1086 sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL);
1087 if (!sbi->s_debts) {
1088 ext2_msg(sb, KERN_ERR, "error: not enough memory");
1089 goto failed_mount_group_desc;
1090 }
1091 for (i = 0; i < db_count; i++) {
1092 block = descriptor_loc(sb, logic_sb_block, i);
1093 sbi->s_group_desc[i] = sb_bread(sb, block);
1094 if (!sbi->s_group_desc[i]) {
1095 for (j = 0; j < i; j++)
1096 brelse (sbi->s_group_desc[j]);
1097 ext2_msg(sb, KERN_ERR,
1098 "error: unable to read group descriptors");
1099 goto failed_mount_group_desc;
1100 }
1101 }
1102 if (!ext2_check_descriptors (sb)) {
1103 ext2_msg(sb, KERN_ERR, "group descriptors corrupted");
1104 goto failed_mount2;
1105 }
1106 sbi->s_gdb_count = db_count;
1107 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1108 spin_lock_init(&sbi->s_next_gen_lock);
1109
1110 /* per fileystem reservation list head & lock */
1111 spin_lock_init(&sbi->s_rsv_window_lock);
1112 sbi->s_rsv_window_root = RB_ROOT;
1113 /*
1114 * Add a single, static dummy reservation to the start of the
1115 * reservation window list --- it gives us a placeholder for
1116 * append-at-start-of-list which makes the allocation logic
1117 * _much_ simpler.
1118 */
1119 sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
1120 sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
1121 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1122 sbi->s_rsv_window_head.rsv_goal_size = 0;
1123 ext2_rsv_window_add(sb, &sbi->s_rsv_window_head);
1124
1125 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1126 ext2_count_free_blocks(sb), GFP_KERNEL);
1127 if (!err) {
1128 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1129 ext2_count_free_inodes(sb), GFP_KERNEL);
1130 }
1131 if (!err) {
1132 err = percpu_counter_init(&sbi->s_dirs_counter,
1133 ext2_count_dirs(sb), GFP_KERNEL);
1134 }
1135 if (err) {
1136 ext2_msg(sb, KERN_ERR, "error: insufficient memory");
1137 goto failed_mount3;
1138 }
1139
1140 #ifdef CONFIG_EXT2_FS_XATTR
1141 sbi->s_ea_block_cache = ext2_xattr_create_cache();
1142 if (!sbi->s_ea_block_cache) {
1143 ext2_msg(sb, KERN_ERR, "Failed to create ea_block_cache");
1144 goto failed_mount3;
1145 }
1146 #endif
1147 /*
1148 * set up enough so that it can read an inode
1149 */
1150 sb->s_op = &ext2_sops;
1151 sb->s_export_op = &ext2_export_ops;
1152 sb->s_xattr = ext2_xattr_handlers;
1153
1154 #ifdef CONFIG_QUOTA
1155 sb->dq_op = &dquot_operations;
1156 sb->s_qcop = &ext2_quotactl_ops;
1157 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1158 #endif
1159
1160 root = ext2_iget(sb, EXT2_ROOT_INO);
1161 if (IS_ERR(root)) {
1162 ret = PTR_ERR(root);
1163 goto failed_mount3;
1164 }
1165 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1166 iput(root);
1167 ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
1168 goto failed_mount3;
1169 }
1170
1171 sb->s_root = d_make_root(root);
1172 if (!sb->s_root) {
1173 ext2_msg(sb, KERN_ERR, "error: get root inode failed");
1174 ret = -ENOMEM;
1175 goto failed_mount3;
1176 }
1177 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL))
1178 ext2_msg(sb, KERN_WARNING,
1179 "warning: mounting ext3 filesystem as ext2");
1180 if (ext2_setup_super (sb, es, sb_rdonly(sb)))
1181 sb->s_flags |= SB_RDONLY;
1182 ext2_write_super(sb);
1183 return 0;
1184
1185 cantfind_ext2:
1186 if (!silent)
1187 ext2_msg(sb, KERN_ERR,
1188 "error: can't find an ext2 filesystem on dev %s.",
1189 sb->s_id);
1190 goto failed_mount;
1191 failed_mount3:
1192 if (sbi->s_ea_block_cache)
1193 ext2_xattr_destroy_cache(sbi->s_ea_block_cache);
1194 percpu_counter_destroy(&sbi->s_freeblocks_counter);
1195 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1196 percpu_counter_destroy(&sbi->s_dirs_counter);
1197 failed_mount2:
1198 for (i = 0; i < db_count; i++)
1199 brelse(sbi->s_group_desc[i]);
1200 failed_mount_group_desc:
1201 kfree(sbi->s_group_desc);
1202 kfree(sbi->s_debts);
1203 failed_mount:
1204 brelse(bh);
1205 failed_sbi:
1206 sb->s_fs_info = NULL;
1207 kfree(sbi->s_blockgroup_lock);
1208 kfree(sbi);
1209 failed:
1210 fs_put_dax(dax_dev);
1211 return ret;
1212 }
1213
1214 static void ext2_clear_super_error(struct super_block *sb)
1215 {
1216 struct buffer_head *sbh = EXT2_SB(sb)->s_sbh;
1217
1218 if (buffer_write_io_error(sbh)) {
1219 /*
1220 * Oh, dear. A previous attempt to write the
1221 * superblock failed. This could happen because the
1222 * USB device was yanked out. Or it could happen to
1223 * be a transient write error and maybe the block will
1224 * be remapped. Nothing we can do but to retry the
1225 * write and hope for the best.
1226 */
1227 ext2_msg(sb, KERN_ERR,
1228 "previous I/O error to superblock detected\n");
1229 clear_buffer_write_io_error(sbh);
1230 set_buffer_uptodate(sbh);
1231 }
1232 }
1233
1234 void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es,
1235 int wait)
1236 {
1237 ext2_clear_super_error(sb);
1238 spin_lock(&EXT2_SB(sb)->s_lock);
1239 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb));
1240 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb));
1241 es->s_wtime = cpu_to_le32(get_seconds());
1242 /* unlock before we do IO */
1243 spin_unlock(&EXT2_SB(sb)->s_lock);
1244 mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
1245 if (wait)
1246 sync_dirty_buffer(EXT2_SB(sb)->s_sbh);
1247 }
1248
1249 /*
1250 * In the second extended file system, it is not necessary to
1251 * write the super block since we use a mapping of the
1252 * disk super block in a buffer.
1253 *
1254 * However, this function is still used to set the fs valid
1255 * flags to 0. We need to set this flag to 0 since the fs
1256 * may have been checked while mounted and e2fsck may have
1257 * set s_state to EXT2_VALID_FS after some corrections.
1258 */
1259 static int ext2_sync_fs(struct super_block *sb, int wait)
1260 {
1261 struct ext2_sb_info *sbi = EXT2_SB(sb);
1262 struct ext2_super_block *es = EXT2_SB(sb)->s_es;
1263
1264 /*
1265 * Write quota structures to quota file, sync_blockdev() will write
1266 * them to disk later
1267 */
1268 dquot_writeback_dquots(sb, -1);
1269
1270 spin_lock(&sbi->s_lock);
1271 if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) {
1272 ext2_debug("setting valid to 0\n");
1273 es->s_state &= cpu_to_le16(~EXT2_VALID_FS);
1274 }
1275 spin_unlock(&sbi->s_lock);
1276 ext2_sync_super(sb, es, wait);
1277 return 0;
1278 }
1279
1280 static int ext2_freeze(struct super_block *sb)
1281 {
1282 struct ext2_sb_info *sbi = EXT2_SB(sb);
1283
1284 /*
1285 * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared
1286 * because we have unattached inodes and thus filesystem is not fully
1287 * consistent.
1288 */
1289 if (atomic_long_read(&sb->s_remove_count)) {
1290 ext2_sync_fs(sb, 1);
1291 return 0;
1292 }
1293 /* Set EXT2_FS_VALID flag */
1294 spin_lock(&sbi->s_lock);
1295 sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state);
1296 spin_unlock(&sbi->s_lock);
1297 ext2_sync_super(sb, sbi->s_es, 1);
1298
1299 return 0;
1300 }
1301
1302 static int ext2_unfreeze(struct super_block *sb)
1303 {
1304 /* Just write sb to clear EXT2_VALID_FS flag */
1305 ext2_write_super(sb);
1306
1307 return 0;
1308 }
1309
1310 static void ext2_write_super(struct super_block *sb)
1311 {
1312 if (!sb_rdonly(sb))
1313 ext2_sync_fs(sb, 1);
1314 }
1315
1316 static int ext2_remount (struct super_block * sb, int * flags, char * data)
1317 {
1318 struct ext2_sb_info * sbi = EXT2_SB(sb);
1319 struct ext2_super_block * es;
1320 struct ext2_mount_options new_opts;
1321 int err;
1322
1323 sync_filesystem(sb);
1324
1325 spin_lock(&sbi->s_lock);
1326 new_opts.s_mount_opt = sbi->s_mount_opt;
1327 new_opts.s_resuid = sbi->s_resuid;
1328 new_opts.s_resgid = sbi->s_resgid;
1329 spin_unlock(&sbi->s_lock);
1330
1331 /*
1332 * Allow the "check" option to be passed as a remount option.
1333 */
1334 if (!parse_options(data, sb, &new_opts))
1335 return -EINVAL;
1336
1337 spin_lock(&sbi->s_lock);
1338 es = sbi->s_es;
1339 if ((sbi->s_mount_opt ^ new_opts.s_mount_opt) & EXT2_MOUNT_DAX) {
1340 ext2_msg(sb, KERN_WARNING, "warning: refusing change of "
1341 "dax flag with busy inodes while remounting");
1342 new_opts.s_mount_opt ^= EXT2_MOUNT_DAX;
1343 }
1344 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
1345 goto out_set;
1346 if (*flags & SB_RDONLY) {
1347 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS ||
1348 !(sbi->s_mount_state & EXT2_VALID_FS))
1349 goto out_set;
1350
1351 /*
1352 * OK, we are remounting a valid rw partition rdonly, so set
1353 * the rdonly flag and then mark the partition as valid again.
1354 */
1355 es->s_state = cpu_to_le16(sbi->s_mount_state);
1356 es->s_mtime = cpu_to_le32(get_seconds());
1357 spin_unlock(&sbi->s_lock);
1358
1359 err = dquot_suspend(sb, -1);
1360 if (err < 0)
1361 return err;
1362
1363 ext2_sync_super(sb, es, 1);
1364 } else {
1365 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb,
1366 ~EXT2_FEATURE_RO_COMPAT_SUPP);
1367 if (ret) {
1368 spin_unlock(&sbi->s_lock);
1369 ext2_msg(sb, KERN_WARNING,
1370 "warning: couldn't remount RDWR because of "
1371 "unsupported optional features (%x).",
1372 le32_to_cpu(ret));
1373 return -EROFS;
1374 }
1375 /*
1376 * Mounting a RDONLY partition read-write, so reread and
1377 * store the current valid flag. (It may have been changed
1378 * by e2fsck since we originally mounted the partition.)
1379 */
1380 sbi->s_mount_state = le16_to_cpu(es->s_state);
1381 if (!ext2_setup_super (sb, es, 0))
1382 sb->s_flags &= ~SB_RDONLY;
1383 spin_unlock(&sbi->s_lock);
1384
1385 ext2_write_super(sb);
1386
1387 dquot_resume(sb, -1);
1388 }
1389
1390 spin_lock(&sbi->s_lock);
1391 out_set:
1392 sbi->s_mount_opt = new_opts.s_mount_opt;
1393 sbi->s_resuid = new_opts.s_resuid;
1394 sbi->s_resgid = new_opts.s_resgid;
1395 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
1396 ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? SB_POSIXACL : 0);
1397 spin_unlock(&sbi->s_lock);
1398
1399 return 0;
1400 }
1401
1402 static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf)
1403 {
1404 struct super_block *sb = dentry->d_sb;
1405 struct ext2_sb_info *sbi = EXT2_SB(sb);
1406 struct ext2_super_block *es = sbi->s_es;
1407 u64 fsid;
1408
1409 spin_lock(&sbi->s_lock);
1410
1411 if (test_opt (sb, MINIX_DF))
1412 sbi->s_overhead_last = 0;
1413 else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
1414 unsigned long i, overhead = 0;
1415 smp_rmb();
1416
1417 /*
1418 * Compute the overhead (FS structures). This is constant
1419 * for a given filesystem unless the number of block groups
1420 * changes so we cache the previous value until it does.
1421 */
1422
1423 /*
1424 * All of the blocks before first_data_block are
1425 * overhead
1426 */
1427 overhead = le32_to_cpu(es->s_first_data_block);
1428
1429 /*
1430 * Add the overhead attributed to the superblock and
1431 * block group descriptors. If the sparse superblocks
1432 * feature is turned on, then not all groups have this.
1433 */
1434 for (i = 0; i < sbi->s_groups_count; i++)
1435 overhead += ext2_bg_has_super(sb, i) +
1436 ext2_bg_num_gdb(sb, i);
1437
1438 /*
1439 * Every block group has an inode bitmap, a block
1440 * bitmap, and an inode table.
1441 */
1442 overhead += (sbi->s_groups_count *
1443 (2 + sbi->s_itb_per_group));
1444 sbi->s_overhead_last = overhead;
1445 smp_wmb();
1446 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
1447 }
1448
1449 buf->f_type = EXT2_SUPER_MAGIC;
1450 buf->f_bsize = sb->s_blocksize;
1451 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
1452 buf->f_bfree = ext2_count_free_blocks(sb);
1453 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
1454 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
1455 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
1456 buf->f_bavail = 0;
1457 buf->f_files = le32_to_cpu(es->s_inodes_count);
1458 buf->f_ffree = ext2_count_free_inodes(sb);
1459 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
1460 buf->f_namelen = EXT2_NAME_LEN;
1461 fsid = le64_to_cpup((void *)es->s_uuid) ^
1462 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
1463 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
1464 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
1465 spin_unlock(&sbi->s_lock);
1466 return 0;
1467 }
1468
1469 static struct dentry *ext2_mount(struct file_system_type *fs_type,
1470 int flags, const char *dev_name, void *data)
1471 {
1472 return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super);
1473 }
1474
1475 #ifdef CONFIG_QUOTA
1476
1477 /* Read data from quotafile - avoid pagecache and such because we cannot afford
1478 * acquiring the locks... As quota files are never truncated and quota code
1479 * itself serializes the operations (and no one else should touch the files)
1480 * we don't have to be afraid of races */
1481 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data,
1482 size_t len, loff_t off)
1483 {
1484 struct inode *inode = sb_dqopt(sb)->files[type];
1485 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1486 int err = 0;
1487 int offset = off & (sb->s_blocksize - 1);
1488 int tocopy;
1489 size_t toread;
1490 struct buffer_head tmp_bh;
1491 struct buffer_head *bh;
1492 loff_t i_size = i_size_read(inode);
1493
1494 if (off > i_size)
1495 return 0;
1496 if (off+len > i_size)
1497 len = i_size-off;
1498 toread = len;
1499 while (toread > 0) {
1500 tocopy = sb->s_blocksize - offset < toread ?
1501 sb->s_blocksize - offset : toread;
1502
1503 tmp_bh.b_state = 0;
1504 tmp_bh.b_size = sb->s_blocksize;
1505 err = ext2_get_block(inode, blk, &tmp_bh, 0);
1506 if (err < 0)
1507 return err;
1508 if (!buffer_mapped(&tmp_bh)) /* A hole? */
1509 memset(data, 0, tocopy);
1510 else {
1511 bh = sb_bread(sb, tmp_bh.b_blocknr);
1512 if (!bh)
1513 return -EIO;
1514 memcpy(data, bh->b_data+offset, tocopy);
1515 brelse(bh);
1516 }
1517 offset = 0;
1518 toread -= tocopy;
1519 data += tocopy;
1520 blk++;
1521 }
1522 return len;
1523 }
1524
1525 /* Write to quotafile */
1526 static ssize_t ext2_quota_write(struct super_block *sb, int type,
1527 const char *data, size_t len, loff_t off)
1528 {
1529 struct inode *inode = sb_dqopt(sb)->files[type];
1530 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1531 int err = 0;
1532 int offset = off & (sb->s_blocksize - 1);
1533 int tocopy;
1534 size_t towrite = len;
1535 struct buffer_head tmp_bh;
1536 struct buffer_head *bh;
1537
1538 while (towrite > 0) {
1539 tocopy = sb->s_blocksize - offset < towrite ?
1540 sb->s_blocksize - offset : towrite;
1541
1542 tmp_bh.b_state = 0;
1543 tmp_bh.b_size = sb->s_blocksize;
1544 err = ext2_get_block(inode, blk, &tmp_bh, 1);
1545 if (err < 0)
1546 goto out;
1547 if (offset || tocopy != EXT2_BLOCK_SIZE(sb))
1548 bh = sb_bread(sb, tmp_bh.b_blocknr);
1549 else
1550 bh = sb_getblk(sb, tmp_bh.b_blocknr);
1551 if (unlikely(!bh)) {
1552 err = -EIO;
1553 goto out;
1554 }
1555 lock_buffer(bh);
1556 memcpy(bh->b_data+offset, data, tocopy);
1557 flush_dcache_page(bh->b_page);
1558 set_buffer_uptodate(bh);
1559 mark_buffer_dirty(bh);
1560 unlock_buffer(bh);
1561 brelse(bh);
1562 offset = 0;
1563 towrite -= tocopy;
1564 data += tocopy;
1565 blk++;
1566 }
1567 out:
1568 if (len == towrite)
1569 return err;
1570 if (inode->i_size < off+len-towrite)
1571 i_size_write(inode, off+len-towrite);
1572 inode->i_version++;
1573 inode->i_mtime = inode->i_ctime = current_time(inode);
1574 mark_inode_dirty(inode);
1575 return len - towrite;
1576 }
1577
1578 static int ext2_quota_on(struct super_block *sb, int type, int format_id,
1579 const struct path *path)
1580 {
1581 int err;
1582 struct inode *inode;
1583
1584 err = dquot_quota_on(sb, type, format_id, path);
1585 if (err)
1586 return err;
1587
1588 inode = d_inode(path->dentry);
1589 inode_lock(inode);
1590 EXT2_I(inode)->i_flags |= EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL;
1591 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
1592 S_NOATIME | S_IMMUTABLE);
1593 inode_unlock(inode);
1594 mark_inode_dirty(inode);
1595
1596 return 0;
1597 }
1598
1599 static int ext2_quota_off(struct super_block *sb, int type)
1600 {
1601 struct inode *inode = sb_dqopt(sb)->files[type];
1602 int err;
1603
1604 if (!inode || !igrab(inode))
1605 goto out;
1606
1607 err = dquot_quota_off(sb, type);
1608 if (err)
1609 goto out_put;
1610
1611 inode_lock(inode);
1612 EXT2_I(inode)->i_flags &= ~(EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL);
1613 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
1614 inode_unlock(inode);
1615 mark_inode_dirty(inode);
1616 out_put:
1617 iput(inode);
1618 return err;
1619 out:
1620 return dquot_quota_off(sb, type);
1621 }
1622
1623 #endif
1624
1625 static struct file_system_type ext2_fs_type = {
1626 .owner = THIS_MODULE,
1627 .name = "ext2",
1628 .mount = ext2_mount,
1629 .kill_sb = kill_block_super,
1630 .fs_flags = FS_REQUIRES_DEV,
1631 };
1632 MODULE_ALIAS_FS("ext2");
1633
1634 static int __init init_ext2_fs(void)
1635 {
1636 int err;
1637
1638 err = init_inodecache();
1639 if (err)
1640 return err;
1641 err = register_filesystem(&ext2_fs_type);
1642 if (err)
1643 goto out;
1644 return 0;
1645 out:
1646 destroy_inodecache();
1647 return err;
1648 }
1649
1650 static void __exit exit_ext2_fs(void)
1651 {
1652 unregister_filesystem(&ext2_fs_type);
1653 destroy_inodecache();
1654 }
1655
1656 MODULE_AUTHOR("Remy Card and others");
1657 MODULE_DESCRIPTION("Second Extended Filesystem");
1658 MODULE_LICENSE("GPL");
1659 module_init(init_ext2_fs)
1660 module_exit(exit_ext2_fs)
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