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19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/slab.h>
23#include <linux/init.h>
24#include <linux/blkdev.h>
25#include <linux/parser.h>
26#include <linux/random.h>
27#include <linux/buffer_head.h>
28#include <linux/exportfs.h>
29#include <linux/vfs.h>
30#include <linux/seq_file.h>
31#include <linux/mount.h>
32#include <linux/log2.h>
33#include <linux/quotaops.h>
34#include <linux/uaccess.h>
35#include <linux/dax.h>
36#include <linux/iversion.h>
37#include "ext2.h"
38#include "xattr.h"
39#include "acl.h"
40
41static void ext2_write_super(struct super_block *sb);
42static int ext2_remount (struct super_block * sb, int * flags, char * data);
43static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf);
44static int ext2_sync_fs(struct super_block *sb, int wait);
45static int ext2_freeze(struct super_block *sb);
46static int ext2_unfreeze(struct super_block *sb);
47
48void ext2_error(struct super_block *sb, const char *function,
49 const char *fmt, ...)
50{
51 struct va_format vaf;
52 va_list args;
53 struct ext2_sb_info *sbi = EXT2_SB(sb);
54 struct ext2_super_block *es = sbi->s_es;
55
56 if (!sb_rdonly(sb)) {
57 spin_lock(&sbi->s_lock);
58 sbi->s_mount_state |= EXT2_ERROR_FS;
59 es->s_state |= cpu_to_le16(EXT2_ERROR_FS);
60 spin_unlock(&sbi->s_lock);
61 ext2_sync_super(sb, es, 1);
62 }
63
64 va_start(args, fmt);
65
66 vaf.fmt = fmt;
67 vaf.va = &args;
68
69 printk(KERN_CRIT "EXT2-fs (%s): error: %s: %pV\n",
70 sb->s_id, function, &vaf);
71
72 va_end(args);
73
74 if (test_opt(sb, ERRORS_PANIC))
75 panic("EXT2-fs: panic from previous error\n");
76 if (test_opt(sb, ERRORS_RO)) {
77 ext2_msg(sb, KERN_CRIT,
78 "error: remounting filesystem read-only");
79 sb->s_flags |= SB_RDONLY;
80 }
81}
82
83void ext2_msg(struct super_block *sb, const char *prefix,
84 const char *fmt, ...)
85{
86 struct va_format vaf;
87 va_list args;
88
89 va_start(args, fmt);
90
91 vaf.fmt = fmt;
92 vaf.va = &args;
93
94 printk("%sEXT2-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
95
96 va_end(args);
97}
98
99
100
101
102void ext2_update_dynamic_rev(struct super_block *sb)
103{
104 struct ext2_super_block *es = EXT2_SB(sb)->s_es;
105
106 if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV)
107 return;
108
109 ext2_msg(sb, KERN_WARNING,
110 "warning: updating to rev %d because of "
111 "new feature flag, running e2fsck is recommended",
112 EXT2_DYNAMIC_REV);
113
114 es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO);
115 es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE);
116 es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV);
117
118
119
120
121
122
123
124
125}
126
127#ifdef CONFIG_QUOTA
128static int ext2_quota_off(struct super_block *sb, int type);
129
130static void ext2_quota_off_umount(struct super_block *sb)
131{
132 int type;
133
134 for (type = 0; type < MAXQUOTAS; type++)
135 ext2_quota_off(sb, type);
136}
137#else
138static inline void ext2_quota_off_umount(struct super_block *sb)
139{
140}
141#endif
142
143static void ext2_put_super (struct super_block * sb)
144{
145 int db_count;
146 int i;
147 struct ext2_sb_info *sbi = EXT2_SB(sb);
148
149 ext2_quota_off_umount(sb);
150
151 if (sbi->s_ea_block_cache) {
152 ext2_xattr_destroy_cache(sbi->s_ea_block_cache);
153 sbi->s_ea_block_cache = NULL;
154 }
155 if (!sb_rdonly(sb)) {
156 struct ext2_super_block *es = sbi->s_es;
157
158 spin_lock(&sbi->s_lock);
159 es->s_state = cpu_to_le16(sbi->s_mount_state);
160 spin_unlock(&sbi->s_lock);
161 ext2_sync_super(sb, es, 1);
162 }
163 db_count = sbi->s_gdb_count;
164 for (i = 0; i < db_count; i++)
165 if (sbi->s_group_desc[i])
166 brelse (sbi->s_group_desc[i]);
167 kfree(sbi->s_group_desc);
168 kfree(sbi->s_debts);
169 percpu_counter_destroy(&sbi->s_freeblocks_counter);
170 percpu_counter_destroy(&sbi->s_freeinodes_counter);
171 percpu_counter_destroy(&sbi->s_dirs_counter);
172 brelse (sbi->s_sbh);
173 sb->s_fs_info = NULL;
174 kfree(sbi->s_blockgroup_lock);
175 fs_put_dax(sbi->s_daxdev);
176 kfree(sbi);
177}
178
179static struct kmem_cache * ext2_inode_cachep;
180
181static 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
196static void ext2_i_callback(struct rcu_head *head)
197{
198 struct inode *inode = container_of(head, struct inode, i_rcu);
199 kmem_cache_free(ext2_inode_cachep, EXT2_I(inode));
200}
201
202static void ext2_destroy_inode(struct inode *inode)
203{
204 call_rcu(&inode->i_rcu, ext2_i_callback);
205}
206
207static void init_once(void *foo)
208{
209 struct ext2_inode_info *ei = (struct ext2_inode_info *) foo;
210
211 rwlock_init(&ei->i_meta_lock);
212#ifdef CONFIG_EXT2_FS_XATTR
213 init_rwsem(&ei->xattr_sem);
214#endif
215 mutex_init(&ei->truncate_mutex);
216#ifdef CONFIG_FS_DAX
217 init_rwsem(&ei->dax_sem);
218#endif
219 inode_init_once(&ei->vfs_inode);
220}
221
222static int __init init_inodecache(void)
223{
224 ext2_inode_cachep = kmem_cache_create_usercopy("ext2_inode_cache",
225 sizeof(struct ext2_inode_info), 0,
226 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
227 SLAB_ACCOUNT),
228 offsetof(struct ext2_inode_info, i_data),
229 sizeof_field(struct ext2_inode_info, i_data),
230 init_once);
231 if (ext2_inode_cachep == NULL)
232 return -ENOMEM;
233 return 0;
234}
235
236static void destroy_inodecache(void)
237{
238
239
240
241
242 rcu_barrier();
243 kmem_cache_destroy(ext2_inode_cachep);
244}
245
246static int ext2_show_options(struct seq_file *seq, struct dentry *root)
247{
248 struct super_block *sb = root->d_sb;
249 struct ext2_sb_info *sbi = EXT2_SB(sb);
250 struct ext2_super_block *es = sbi->s_es;
251 unsigned long def_mount_opts;
252
253 spin_lock(&sbi->s_lock);
254 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
255
256 if (sbi->s_sb_block != 1)
257 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
258 if (test_opt(sb, MINIX_DF))
259 seq_puts(seq, ",minixdf");
260 if (test_opt(sb, GRPID))
261 seq_puts(seq, ",grpid");
262 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS))
263 seq_puts(seq, ",nogrpid");
264 if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT2_DEF_RESUID)) ||
265 le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) {
266 seq_printf(seq, ",resuid=%u",
267 from_kuid_munged(&init_user_ns, sbi->s_resuid));
268 }
269 if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT2_DEF_RESGID)) ||
270 le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) {
271 seq_printf(seq, ",resgid=%u",
272 from_kgid_munged(&init_user_ns, sbi->s_resgid));
273 }
274 if (test_opt(sb, ERRORS_RO)) {
275 int def_errors = le16_to_cpu(es->s_errors);
276
277 if (def_errors == EXT2_ERRORS_PANIC ||
278 def_errors == EXT2_ERRORS_CONTINUE) {
279 seq_puts(seq, ",errors=remount-ro");
280 }
281 }
282 if (test_opt(sb, ERRORS_CONT))
283 seq_puts(seq, ",errors=continue");
284 if (test_opt(sb, ERRORS_PANIC))
285 seq_puts(seq, ",errors=panic");
286 if (test_opt(sb, NO_UID32))
287 seq_puts(seq, ",nouid32");
288 if (test_opt(sb, DEBUG))
289 seq_puts(seq, ",debug");
290 if (test_opt(sb, OLDALLOC))
291 seq_puts(seq, ",oldalloc");
292
293#ifdef CONFIG_EXT2_FS_XATTR
294 if (test_opt(sb, XATTR_USER))
295 seq_puts(seq, ",user_xattr");
296 if (!test_opt(sb, XATTR_USER) &&
297 (def_mount_opts & EXT2_DEFM_XATTR_USER)) {
298 seq_puts(seq, ",nouser_xattr");
299 }
300#endif
301
302#ifdef CONFIG_EXT2_FS_POSIX_ACL
303 if (test_opt(sb, POSIX_ACL))
304 seq_puts(seq, ",acl");
305 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL))
306 seq_puts(seq, ",noacl");
307#endif
308
309 if (test_opt(sb, NOBH))
310 seq_puts(seq, ",nobh");
311
312#if defined(CONFIG_QUOTA)
313 if (sbi->s_mount_opt & EXT2_MOUNT_USRQUOTA)
314 seq_puts(seq, ",usrquota");
315
316 if (sbi->s_mount_opt & EXT2_MOUNT_GRPQUOTA)
317 seq_puts(seq, ",grpquota");
318#endif
319
320#ifdef CONFIG_FS_DAX
321 if (sbi->s_mount_opt & EXT2_MOUNT_XIP)
322 seq_puts(seq, ",xip");
323 if (sbi->s_mount_opt & EXT2_MOUNT_DAX)
324 seq_puts(seq, ",dax");
325#endif
326
327 if (!test_opt(sb, RESERVATION))
328 seq_puts(seq, ",noreservation");
329
330 spin_unlock(&sbi->s_lock);
331 return 0;
332}
333
334#ifdef CONFIG_QUOTA
335static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off);
336static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off);
337static int ext2_quota_on(struct super_block *sb, int type, int format_id,
338 const struct path *path);
339static struct dquot **ext2_get_dquots(struct inode *inode)
340{
341 return EXT2_I(inode)->i_dquot;
342}
343
344static const struct quotactl_ops ext2_quotactl_ops = {
345 .quota_on = ext2_quota_on,
346 .quota_off = ext2_quota_off,
347 .quota_sync = dquot_quota_sync,
348 .get_state = dquot_get_state,
349 .set_info = dquot_set_dqinfo,
350 .get_dqblk = dquot_get_dqblk,
351 .set_dqblk = dquot_set_dqblk,
352 .get_nextdqblk = dquot_get_next_dqblk,
353};
354#endif
355
356static const struct super_operations ext2_sops = {
357 .alloc_inode = ext2_alloc_inode,
358 .destroy_inode = ext2_destroy_inode,
359 .write_inode = ext2_write_inode,
360 .evict_inode = ext2_evict_inode,
361 .put_super = ext2_put_super,
362 .sync_fs = ext2_sync_fs,
363 .freeze_fs = ext2_freeze,
364 .unfreeze_fs = ext2_unfreeze,
365 .statfs = ext2_statfs,
366 .remount_fs = ext2_remount,
367 .show_options = ext2_show_options,
368#ifdef CONFIG_QUOTA
369 .quota_read = ext2_quota_read,
370 .quota_write = ext2_quota_write,
371 .get_dquots = ext2_get_dquots,
372#endif
373};
374
375static struct inode *ext2_nfs_get_inode(struct super_block *sb,
376 u64 ino, u32 generation)
377{
378 struct inode *inode;
379
380 if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO)
381 return ERR_PTR(-ESTALE);
382 if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count))
383 return ERR_PTR(-ESTALE);
384
385
386
387
388
389
390 inode = ext2_iget(sb, ino);
391 if (IS_ERR(inode))
392 return ERR_CAST(inode);
393 if (generation && inode->i_generation != generation) {
394
395 iput(inode);
396 return ERR_PTR(-ESTALE);
397 }
398 return inode;
399}
400
401static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid,
402 int fh_len, int fh_type)
403{
404 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
405 ext2_nfs_get_inode);
406}
407
408static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid,
409 int fh_len, int fh_type)
410{
411 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
412 ext2_nfs_get_inode);
413}
414
415static const struct export_operations ext2_export_ops = {
416 .fh_to_dentry = ext2_fh_to_dentry,
417 .fh_to_parent = ext2_fh_to_parent,
418 .get_parent = ext2_get_parent,
419};
420
421static unsigned long get_sb_block(void **data)
422{
423 unsigned long sb_block;
424 char *options = (char *) *data;
425
426 if (!options || strncmp(options, "sb=", 3) != 0)
427 return 1;
428 options += 3;
429 sb_block = simple_strtoul(options, &options, 0);
430 if (*options && *options != ',') {
431 printk("EXT2-fs: Invalid sb specification: %s\n",
432 (char *) *data);
433 return 1;
434 }
435 if (*options == ',')
436 options++;
437 *data = (void *) options;
438 return sb_block;
439}
440
441enum {
442 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
443 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic,
444 Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug,
445 Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr,
446 Opt_acl, Opt_noacl, Opt_xip, Opt_dax, Opt_ignore, Opt_err, Opt_quota,
447 Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation
448};
449
450static const match_table_t tokens = {
451 {Opt_bsd_df, "bsddf"},
452 {Opt_minix_df, "minixdf"},
453 {Opt_grpid, "grpid"},
454 {Opt_grpid, "bsdgroups"},
455 {Opt_nogrpid, "nogrpid"},
456 {Opt_nogrpid, "sysvgroups"},
457 {Opt_resgid, "resgid=%u"},
458 {Opt_resuid, "resuid=%u"},
459 {Opt_sb, "sb=%u"},
460 {Opt_err_cont, "errors=continue"},
461 {Opt_err_panic, "errors=panic"},
462 {Opt_err_ro, "errors=remount-ro"},
463 {Opt_nouid32, "nouid32"},
464 {Opt_nocheck, "check=none"},
465 {Opt_nocheck, "nocheck"},
466 {Opt_debug, "debug"},
467 {Opt_oldalloc, "oldalloc"},
468 {Opt_orlov, "orlov"},
469 {Opt_nobh, "nobh"},
470 {Opt_user_xattr, "user_xattr"},
471 {Opt_nouser_xattr, "nouser_xattr"},
472 {Opt_acl, "acl"},
473 {Opt_noacl, "noacl"},
474 {Opt_xip, "xip"},
475 {Opt_dax, "dax"},
476 {Opt_grpquota, "grpquota"},
477 {Opt_ignore, "noquota"},
478 {Opt_quota, "quota"},
479 {Opt_usrquota, "usrquota"},
480 {Opt_reservation, "reservation"},
481 {Opt_noreservation, "noreservation"},
482 {Opt_err, NULL}
483};
484
485static int parse_options(char *options, struct super_block *sb,
486 struct ext2_mount_options *opts)
487{
488 char *p;
489 substring_t args[MAX_OPT_ARGS];
490 int option;
491 kuid_t uid;
492 kgid_t gid;
493
494 if (!options)
495 return 1;
496
497 while ((p = strsep (&options, ",")) != NULL) {
498 int token;
499 if (!*p)
500 continue;
501
502 token = match_token(p, tokens, args);
503 switch (token) {
504 case Opt_bsd_df:
505 clear_opt (opts->s_mount_opt, MINIX_DF);
506 break;
507 case Opt_minix_df:
508 set_opt (opts->s_mount_opt, MINIX_DF);
509 break;
510 case Opt_grpid:
511 set_opt (opts->s_mount_opt, GRPID);
512 break;
513 case Opt_nogrpid:
514 clear_opt (opts->s_mount_opt, GRPID);
515 break;
516 case Opt_resuid:
517 if (match_int(&args[0], &option))
518 return 0;
519 uid = make_kuid(current_user_ns(), option);
520 if (!uid_valid(uid)) {
521 ext2_msg(sb, KERN_ERR, "Invalid uid value %d", option);
522 return 0;
523
524 }
525 opts->s_resuid = uid;
526 break;
527 case Opt_resgid:
528 if (match_int(&args[0], &option))
529 return 0;
530 gid = make_kgid(current_user_ns(), option);
531 if (!gid_valid(gid)) {
532 ext2_msg(sb, KERN_ERR, "Invalid gid value %d", option);
533 return 0;
534 }
535 opts->s_resgid = gid;
536 break;
537 case Opt_sb:
538
539
540 break;
541 case Opt_err_panic:
542 clear_opt (opts->s_mount_opt, ERRORS_CONT);
543 clear_opt (opts->s_mount_opt, ERRORS_RO);
544 set_opt (opts->s_mount_opt, ERRORS_PANIC);
545 break;
546 case Opt_err_ro:
547 clear_opt (opts->s_mount_opt, ERRORS_CONT);
548 clear_opt (opts->s_mount_opt, ERRORS_PANIC);
549 set_opt (opts->s_mount_opt, ERRORS_RO);
550 break;
551 case Opt_err_cont:
552 clear_opt (opts->s_mount_opt, ERRORS_RO);
553 clear_opt (opts->s_mount_opt, ERRORS_PANIC);
554 set_opt (opts->s_mount_opt, ERRORS_CONT);
555 break;
556 case Opt_nouid32:
557 set_opt (opts->s_mount_opt, NO_UID32);
558 break;
559 case Opt_nocheck:
560 ext2_msg(sb, KERN_WARNING,
561 "Option nocheck/check=none is deprecated and"
562 " will be removed in June 2020.");
563 clear_opt (opts->s_mount_opt, CHECK);
564 break;
565 case Opt_debug:
566 set_opt (opts->s_mount_opt, DEBUG);
567 break;
568 case Opt_oldalloc:
569 set_opt (opts->s_mount_opt, OLDALLOC);
570 break;
571 case Opt_orlov:
572 clear_opt (opts->s_mount_opt, OLDALLOC);
573 break;
574 case Opt_nobh:
575 set_opt (opts->s_mount_opt, NOBH);
576 break;
577#ifdef CONFIG_EXT2_FS_XATTR
578 case Opt_user_xattr:
579 set_opt (opts->s_mount_opt, XATTR_USER);
580 break;
581 case Opt_nouser_xattr:
582 clear_opt (opts->s_mount_opt, XATTR_USER);
583 break;
584#else
585 case Opt_user_xattr:
586 case Opt_nouser_xattr:
587 ext2_msg(sb, KERN_INFO, "(no)user_xattr options"
588 "not supported");
589 break;
590#endif
591#ifdef CONFIG_EXT2_FS_POSIX_ACL
592 case Opt_acl:
593 set_opt(opts->s_mount_opt, POSIX_ACL);
594 break;
595 case Opt_noacl:
596 clear_opt(opts->s_mount_opt, POSIX_ACL);
597 break;
598#else
599 case Opt_acl:
600 case Opt_noacl:
601 ext2_msg(sb, KERN_INFO,
602 "(no)acl options not supported");
603 break;
604#endif
605 case Opt_xip:
606 ext2_msg(sb, KERN_INFO, "use dax instead of xip");
607 set_opt(opts->s_mount_opt, XIP);
608
609 case Opt_dax:
610#ifdef CONFIG_FS_DAX
611 ext2_msg(sb, KERN_WARNING,
612 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
613 set_opt(opts->s_mount_opt, DAX);
614#else
615 ext2_msg(sb, KERN_INFO, "dax option not supported");
616#endif
617 break;
618
619#if defined(CONFIG_QUOTA)
620 case Opt_quota:
621 case Opt_usrquota:
622 set_opt(opts->s_mount_opt, USRQUOTA);
623 break;
624
625 case Opt_grpquota:
626 set_opt(opts->s_mount_opt, GRPQUOTA);
627 break;
628#else
629 case Opt_quota:
630 case Opt_usrquota:
631 case Opt_grpquota:
632 ext2_msg(sb, KERN_INFO,
633 "quota operations not supported");
634 break;
635#endif
636
637 case Opt_reservation:
638 set_opt(opts->s_mount_opt, RESERVATION);
639 ext2_msg(sb, KERN_INFO, "reservations ON");
640 break;
641 case Opt_noreservation:
642 clear_opt(opts->s_mount_opt, RESERVATION);
643 ext2_msg(sb, KERN_INFO, "reservations OFF");
644 break;
645 case Opt_ignore:
646 break;
647 default:
648 return 0;
649 }
650 }
651 return 1;
652}
653
654static int ext2_setup_super (struct super_block * sb,
655 struct ext2_super_block * es,
656 int read_only)
657{
658 int res = 0;
659 struct ext2_sb_info *sbi = EXT2_SB(sb);
660
661 if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) {
662 ext2_msg(sb, KERN_ERR,
663 "error: revision level too high, "
664 "forcing read-only mode");
665 res = SB_RDONLY;
666 }
667 if (read_only)
668 return res;
669 if (!(sbi->s_mount_state & EXT2_VALID_FS))
670 ext2_msg(sb, KERN_WARNING,
671 "warning: mounting unchecked fs, "
672 "running e2fsck is recommended");
673 else if ((sbi->s_mount_state & EXT2_ERROR_FS))
674 ext2_msg(sb, KERN_WARNING,
675 "warning: mounting fs with errors, "
676 "running e2fsck is recommended");
677 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
678 le16_to_cpu(es->s_mnt_count) >=
679 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
680 ext2_msg(sb, KERN_WARNING,
681 "warning: maximal mount count reached, "
682 "running e2fsck is recommended");
683 else if (le32_to_cpu(es->s_checkinterval) &&
684 (le32_to_cpu(es->s_lastcheck) +
685 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
686 ext2_msg(sb, KERN_WARNING,
687 "warning: checktime reached, "
688 "running e2fsck is recommended");
689 if (!le16_to_cpu(es->s_max_mnt_count))
690 es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT);
691 le16_add_cpu(&es->s_mnt_count, 1);
692 if (test_opt (sb, DEBUG))
693 ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, fs=%lu, gc=%lu, "
694 "bpg=%lu, ipg=%lu, mo=%04lx]",
695 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize,
696 sbi->s_frag_size,
697 sbi->s_groups_count,
698 EXT2_BLOCKS_PER_GROUP(sb),
699 EXT2_INODES_PER_GROUP(sb),
700 sbi->s_mount_opt);
701 return res;
702}
703
704static int ext2_check_descriptors(struct super_block *sb)
705{
706 int i;
707 struct ext2_sb_info *sbi = EXT2_SB(sb);
708
709 ext2_debug ("Checking group descriptors");
710
711 for (i = 0; i < sbi->s_groups_count; i++) {
712 struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL);
713 ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i);
714 ext2_fsblk_t last_block;
715
716 if (i == sbi->s_groups_count - 1)
717 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
718 else
719 last_block = first_block +
720 (EXT2_BLOCKS_PER_GROUP(sb) - 1);
721
722 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
723 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
724 {
725 ext2_error (sb, "ext2_check_descriptors",
726 "Block bitmap for group %d"
727 " not in group (block %lu)!",
728 i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap));
729 return 0;
730 }
731 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
732 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
733 {
734 ext2_error (sb, "ext2_check_descriptors",
735 "Inode bitmap for group %d"
736 " not in group (block %lu)!",
737 i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap));
738 return 0;
739 }
740 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
741 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
742 last_block)
743 {
744 ext2_error (sb, "ext2_check_descriptors",
745 "Inode table for group %d"
746 " not in group (block %lu)!",
747 i, (unsigned long) le32_to_cpu(gdp->bg_inode_table));
748 return 0;
749 }
750 }
751 return 1;
752}
753
754
755
756
757
758
759static loff_t ext2_max_size(int bits)
760{
761 loff_t res = EXT2_NDIR_BLOCKS;
762 int meta_blocks;
763 loff_t upper_limit;
764
765
766
767
768
769
770
771
772 upper_limit = (1LL << 32) - 1;
773
774
775 upper_limit >>= (bits - 9);
776
777
778
779 meta_blocks = 1;
780
781 meta_blocks += 1 + (1LL << (bits-2));
782
783 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
784
785 upper_limit -= meta_blocks;
786 upper_limit <<= bits;
787
788 res += 1LL << (bits-2);
789 res += 1LL << (2*(bits-2));
790 res += 1LL << (3*(bits-2));
791 res <<= bits;
792 if (res > upper_limit)
793 res = upper_limit;
794
795 if (res > MAX_LFS_FILESIZE)
796 res = MAX_LFS_FILESIZE;
797
798 return res;
799}
800
801static unsigned long descriptor_loc(struct super_block *sb,
802 unsigned long logic_sb_block,
803 int nr)
804{
805 struct ext2_sb_info *sbi = EXT2_SB(sb);
806 unsigned long bg, first_meta_bg;
807 int has_super = 0;
808
809 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
810
811 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) ||
812 nr < first_meta_bg)
813 return (logic_sb_block + nr + 1);
814 bg = sbi->s_desc_per_block * nr;
815 if (ext2_bg_has_super(sb, bg))
816 has_super = 1;
817
818 return ext2_group_first_block_no(sb, bg) + has_super;
819}
820
821static int ext2_fill_super(struct super_block *sb, void *data, int silent)
822{
823 struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev);
824 struct buffer_head * bh;
825 struct ext2_sb_info * sbi;
826 struct ext2_super_block * es;
827 struct inode *root;
828 unsigned long block;
829 unsigned long sb_block = get_sb_block(&data);
830 unsigned long logic_sb_block;
831 unsigned long offset = 0;
832 unsigned long def_mount_opts;
833 long ret = -ENOMEM;
834 int blocksize = BLOCK_SIZE;
835 int db_count;
836 int i, j;
837 __le32 features;
838 int err;
839 struct ext2_mount_options opts;
840
841 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
842 if (!sbi)
843 goto failed;
844
845 sbi->s_blockgroup_lock =
846 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
847 if (!sbi->s_blockgroup_lock) {
848 kfree(sbi);
849 goto failed;
850 }
851 sb->s_fs_info = sbi;
852 sbi->s_sb_block = sb_block;
853 sbi->s_daxdev = dax_dev;
854
855 spin_lock_init(&sbi->s_lock);
856 ret = -EINVAL;
857
858
859
860
861
862
863
864
865 blocksize = sb_min_blocksize(sb, BLOCK_SIZE);
866 if (!blocksize) {
867 ext2_msg(sb, KERN_ERR, "error: unable to set blocksize");
868 goto failed_sbi;
869 }
870
871
872
873
874
875 if (blocksize != BLOCK_SIZE) {
876 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
877 offset = (sb_block*BLOCK_SIZE) % blocksize;
878 } else {
879 logic_sb_block = sb_block;
880 }
881
882 if (!(bh = sb_bread(sb, logic_sb_block))) {
883 ext2_msg(sb, KERN_ERR, "error: unable to read superblock");
884 goto failed_sbi;
885 }
886
887
888
889
890 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
891 sbi->s_es = es;
892 sb->s_magic = le16_to_cpu(es->s_magic);
893
894 if (sb->s_magic != EXT2_SUPER_MAGIC)
895 goto cantfind_ext2;
896
897
898 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
899 if (def_mount_opts & EXT2_DEFM_DEBUG)
900 set_opt(opts.s_mount_opt, DEBUG);
901 if (def_mount_opts & EXT2_DEFM_BSDGROUPS)
902 set_opt(opts.s_mount_opt, GRPID);
903 if (def_mount_opts & EXT2_DEFM_UID16)
904 set_opt(opts.s_mount_opt, NO_UID32);
905#ifdef CONFIG_EXT2_FS_XATTR
906 if (def_mount_opts & EXT2_DEFM_XATTR_USER)
907 set_opt(opts.s_mount_opt, XATTR_USER);
908#endif
909#ifdef CONFIG_EXT2_FS_POSIX_ACL
910 if (def_mount_opts & EXT2_DEFM_ACL)
911 set_opt(opts.s_mount_opt, POSIX_ACL);
912#endif
913
914 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
915 set_opt(opts.s_mount_opt, ERRORS_PANIC);
916 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE)
917 set_opt(opts.s_mount_opt, ERRORS_CONT);
918 else
919 set_opt(opts.s_mount_opt, ERRORS_RO);
920
921 opts.s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
922 opts.s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
923
924 set_opt(opts.s_mount_opt, RESERVATION);
925
926 if (!parse_options((char *) data, sb, &opts))
927 goto failed_mount;
928
929 sbi->s_mount_opt = opts.s_mount_opt;
930 sbi->s_resuid = opts.s_resuid;
931 sbi->s_resgid = opts.s_resgid;
932
933 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
934 ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ?
935 SB_POSIXACL : 0);
936 sb->s_iflags |= SB_I_CGROUPWB;
937
938 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV &&
939 (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) ||
940 EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
941 EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U)))
942 ext2_msg(sb, KERN_WARNING,
943 "warning: feature flags set on rev 0 fs, "
944 "running e2fsck is recommended");
945
946
947
948
949
950 features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP);
951 if (features) {
952 ext2_msg(sb, KERN_ERR, "error: couldn't mount because of "
953 "unsupported optional features (%x)",
954 le32_to_cpu(features));
955 goto failed_mount;
956 }
957 if (!sb_rdonly(sb) && (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){
958 ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of "
959 "unsupported optional features (%x)",
960 le32_to_cpu(features));
961 goto failed_mount;
962 }
963
964 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
965
966 if (sbi->s_mount_opt & EXT2_MOUNT_DAX) {
967 if (!bdev_dax_supported(sb->s_bdev, blocksize)) {
968 ext2_msg(sb, KERN_ERR,
969 "DAX unsupported by block device. Turning off DAX.");
970 sbi->s_mount_opt &= ~EXT2_MOUNT_DAX;
971 }
972 }
973
974
975 if (sb->s_blocksize != blocksize) {
976 brelse(bh);
977
978 if (!sb_set_blocksize(sb, blocksize)) {
979 ext2_msg(sb, KERN_ERR,
980 "error: bad blocksize %d", blocksize);
981 goto failed_sbi;
982 }
983
984 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
985 offset = (sb_block*BLOCK_SIZE) % blocksize;
986 bh = sb_bread(sb, logic_sb_block);
987 if(!bh) {
988 ext2_msg(sb, KERN_ERR, "error: couldn't read"
989 "superblock on 2nd try");
990 goto failed_sbi;
991 }
992 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
993 sbi->s_es = es;
994 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) {
995 ext2_msg(sb, KERN_ERR, "error: magic mismatch");
996 goto failed_mount;
997 }
998 }
999
1000 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits);
1001 sb->s_max_links = EXT2_LINK_MAX;
1002 sb->s_time_min = S32_MIN;
1003 sb->s_time_max = S32_MAX;
1004
1005 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) {
1006 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
1007 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
1008 } else {
1009 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1010 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1011 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) ||
1012 !is_power_of_2(sbi->s_inode_size) ||
1013 (sbi->s_inode_size > blocksize)) {
1014 ext2_msg(sb, KERN_ERR,
1015 "error: unsupported inode size: %d",
1016 sbi->s_inode_size);
1017 goto failed_mount;
1018 }
1019 }
1020
1021 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE <<
1022 le32_to_cpu(es->s_log_frag_size);
1023 if (sbi->s_frag_size == 0)
1024 goto cantfind_ext2;
1025 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size;
1026
1027 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1028 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1029 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1030
1031 if (EXT2_INODE_SIZE(sb) == 0)
1032 goto cantfind_ext2;
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 ext2_msg(sb, KERN_ERR, "error: not enough memory");
1095 goto failed_mount;
1096 }
1097 bgl_lock_init(sbi->s_blockgroup_lock);
1098 sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL);
1099 if (!sbi->s_debts) {
1100 ext2_msg(sb, KERN_ERR, "error: not enough memory");
1101 goto failed_mount_group_desc;
1102 }
1103 for (i = 0; i < db_count; i++) {
1104 block = descriptor_loc(sb, logic_sb_block, i);
1105 sbi->s_group_desc[i] = sb_bread(sb, block);
1106 if (!sbi->s_group_desc[i]) {
1107 for (j = 0; j < i; j++)
1108 brelse (sbi->s_group_desc[j]);
1109 ext2_msg(sb, KERN_ERR,
1110 "error: unable to read group descriptors");
1111 goto failed_mount_group_desc;
1112 }
1113 }
1114 if (!ext2_check_descriptors (sb)) {
1115 ext2_msg(sb, KERN_ERR, "group descriptors corrupted");
1116 goto failed_mount2;
1117 }
1118 sbi->s_gdb_count = db_count;
1119 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1120 spin_lock_init(&sbi->s_next_gen_lock);
1121
1122
1123 spin_lock_init(&sbi->s_rsv_window_lock);
1124 sbi->s_rsv_window_root = RB_ROOT;
1125
1126
1127
1128
1129
1130
1131 sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
1132 sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
1133 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1134 sbi->s_rsv_window_head.rsv_goal_size = 0;
1135 ext2_rsv_window_add(sb, &sbi->s_rsv_window_head);
1136
1137 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1138 ext2_count_free_blocks(sb), GFP_KERNEL);
1139 if (!err) {
1140 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1141 ext2_count_free_inodes(sb), GFP_KERNEL);
1142 }
1143 if (!err) {
1144 err = percpu_counter_init(&sbi->s_dirs_counter,
1145 ext2_count_dirs(sb), GFP_KERNEL);
1146 }
1147 if (err) {
1148 ext2_msg(sb, KERN_ERR, "error: insufficient memory");
1149 goto failed_mount3;
1150 }
1151
1152#ifdef CONFIG_EXT2_FS_XATTR
1153 sbi->s_ea_block_cache = ext2_xattr_create_cache();
1154 if (!sbi->s_ea_block_cache) {
1155 ext2_msg(sb, KERN_ERR, "Failed to create ea_block_cache");
1156 goto failed_mount3;
1157 }
1158#endif
1159
1160
1161
1162 sb->s_op = &ext2_sops;
1163 sb->s_export_op = &ext2_export_ops;
1164 sb->s_xattr = ext2_xattr_handlers;
1165
1166#ifdef CONFIG_QUOTA
1167 sb->dq_op = &dquot_operations;
1168 sb->s_qcop = &ext2_quotactl_ops;
1169 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1170#endif
1171
1172 root = ext2_iget(sb, EXT2_ROOT_INO);
1173 if (IS_ERR(root)) {
1174 ret = PTR_ERR(root);
1175 goto failed_mount3;
1176 }
1177 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1178 iput(root);
1179 ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
1180 goto failed_mount3;
1181 }
1182
1183 sb->s_root = d_make_root(root);
1184 if (!sb->s_root) {
1185 ext2_msg(sb, KERN_ERR, "error: get root inode failed");
1186 ret = -ENOMEM;
1187 goto failed_mount3;
1188 }
1189 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL))
1190 ext2_msg(sb, KERN_WARNING,
1191 "warning: mounting ext3 filesystem as ext2");
1192 if (ext2_setup_super (sb, es, sb_rdonly(sb)))
1193 sb->s_flags |= SB_RDONLY;
1194 ext2_write_super(sb);
1195 return 0;
1196
1197cantfind_ext2:
1198 if (!silent)
1199 ext2_msg(sb, KERN_ERR,
1200 "error: can't find an ext2 filesystem on dev %s.",
1201 sb->s_id);
1202 goto failed_mount;
1203failed_mount3:
1204 if (sbi->s_ea_block_cache)
1205 ext2_xattr_destroy_cache(sbi->s_ea_block_cache);
1206 percpu_counter_destroy(&sbi->s_freeblocks_counter);
1207 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1208 percpu_counter_destroy(&sbi->s_dirs_counter);
1209failed_mount2:
1210 for (i = 0; i < db_count; i++)
1211 brelse(sbi->s_group_desc[i]);
1212failed_mount_group_desc:
1213 kfree(sbi->s_group_desc);
1214 kfree(sbi->s_debts);
1215failed_mount:
1216 brelse(bh);
1217failed_sbi:
1218 sb->s_fs_info = NULL;
1219 kfree(sbi->s_blockgroup_lock);
1220 kfree(sbi);
1221failed:
1222 fs_put_dax(dax_dev);
1223 return ret;
1224}
1225
1226static void ext2_clear_super_error(struct super_block *sb)
1227{
1228 struct buffer_head *sbh = EXT2_SB(sb)->s_sbh;
1229
1230 if (buffer_write_io_error(sbh)) {
1231
1232
1233
1234
1235
1236
1237
1238
1239 ext2_msg(sb, KERN_ERR,
1240 "previous I/O error to superblock detected");
1241 clear_buffer_write_io_error(sbh);
1242 set_buffer_uptodate(sbh);
1243 }
1244}
1245
1246void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es,
1247 int wait)
1248{
1249 ext2_clear_super_error(sb);
1250 spin_lock(&EXT2_SB(sb)->s_lock);
1251 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb));
1252 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb));
1253 es->s_wtime = cpu_to_le32(get_seconds());
1254
1255 spin_unlock(&EXT2_SB(sb)->s_lock);
1256 mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
1257 if (wait)
1258 sync_dirty_buffer(EXT2_SB(sb)->s_sbh);
1259}
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271static int ext2_sync_fs(struct super_block *sb, int wait)
1272{
1273 struct ext2_sb_info *sbi = EXT2_SB(sb);
1274 struct ext2_super_block *es = EXT2_SB(sb)->s_es;
1275
1276
1277
1278
1279
1280 dquot_writeback_dquots(sb, -1);
1281
1282 spin_lock(&sbi->s_lock);
1283 if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) {
1284 ext2_debug("setting valid to 0\n");
1285 es->s_state &= cpu_to_le16(~EXT2_VALID_FS);
1286 }
1287 spin_unlock(&sbi->s_lock);
1288 ext2_sync_super(sb, es, wait);
1289 return 0;
1290}
1291
1292static int ext2_freeze(struct super_block *sb)
1293{
1294 struct ext2_sb_info *sbi = EXT2_SB(sb);
1295
1296
1297
1298
1299
1300
1301 if (atomic_long_read(&sb->s_remove_count)) {
1302 ext2_sync_fs(sb, 1);
1303 return 0;
1304 }
1305
1306 spin_lock(&sbi->s_lock);
1307 sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state);
1308 spin_unlock(&sbi->s_lock);
1309 ext2_sync_super(sb, sbi->s_es, 1);
1310
1311 return 0;
1312}
1313
1314static int ext2_unfreeze(struct super_block *sb)
1315{
1316
1317 ext2_write_super(sb);
1318
1319 return 0;
1320}
1321
1322static void ext2_write_super(struct super_block *sb)
1323{
1324 if (!sb_rdonly(sb))
1325 ext2_sync_fs(sb, 1);
1326}
1327
1328static int ext2_remount (struct super_block * sb, int * flags, char * data)
1329{
1330 struct ext2_sb_info * sbi = EXT2_SB(sb);
1331 struct ext2_super_block * es;
1332 struct ext2_mount_options new_opts;
1333 int err;
1334
1335 sync_filesystem(sb);
1336
1337 spin_lock(&sbi->s_lock);
1338 new_opts.s_mount_opt = sbi->s_mount_opt;
1339 new_opts.s_resuid = sbi->s_resuid;
1340 new_opts.s_resgid = sbi->s_resgid;
1341 spin_unlock(&sbi->s_lock);
1342
1343 if (!parse_options(data, sb, &new_opts))
1344 return -EINVAL;
1345
1346 spin_lock(&sbi->s_lock);
1347 es = sbi->s_es;
1348 if ((sbi->s_mount_opt ^ new_opts.s_mount_opt) & EXT2_MOUNT_DAX) {
1349 ext2_msg(sb, KERN_WARNING, "warning: refusing change of "
1350 "dax flag with busy inodes while remounting");
1351 new_opts.s_mount_opt ^= EXT2_MOUNT_DAX;
1352 }
1353 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
1354 goto out_set;
1355 if (*flags & SB_RDONLY) {
1356 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS ||
1357 !(sbi->s_mount_state & EXT2_VALID_FS))
1358 goto out_set;
1359
1360
1361
1362
1363
1364 es->s_state = cpu_to_le16(sbi->s_mount_state);
1365 es->s_mtime = cpu_to_le32(get_seconds());
1366 spin_unlock(&sbi->s_lock);
1367
1368 err = dquot_suspend(sb, -1);
1369 if (err < 0)
1370 return err;
1371
1372 ext2_sync_super(sb, es, 1);
1373 } else {
1374 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb,
1375 ~EXT2_FEATURE_RO_COMPAT_SUPP);
1376 if (ret) {
1377 spin_unlock(&sbi->s_lock);
1378 ext2_msg(sb, KERN_WARNING,
1379 "warning: couldn't remount RDWR because of "
1380 "unsupported optional features (%x).",
1381 le32_to_cpu(ret));
1382 return -EROFS;
1383 }
1384
1385
1386
1387
1388
1389 sbi->s_mount_state = le16_to_cpu(es->s_state);
1390 if (!ext2_setup_super (sb, es, 0))
1391 sb->s_flags &= ~SB_RDONLY;
1392 spin_unlock(&sbi->s_lock);
1393
1394 ext2_write_super(sb);
1395
1396 dquot_resume(sb, -1);
1397 }
1398
1399 spin_lock(&sbi->s_lock);
1400out_set:
1401 sbi->s_mount_opt = new_opts.s_mount_opt;
1402 sbi->s_resuid = new_opts.s_resuid;
1403 sbi->s_resgid = new_opts.s_resgid;
1404 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
1405 ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? SB_POSIXACL : 0);
1406 spin_unlock(&sbi->s_lock);
1407
1408 return 0;
1409}
1410
1411static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf)
1412{
1413 struct super_block *sb = dentry->d_sb;
1414 struct ext2_sb_info *sbi = EXT2_SB(sb);
1415 struct ext2_super_block *es = sbi->s_es;
1416 u64 fsid;
1417
1418 spin_lock(&sbi->s_lock);
1419
1420 if (test_opt (sb, MINIX_DF))
1421 sbi->s_overhead_last = 0;
1422 else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
1423 unsigned long i, overhead = 0;
1424 smp_rmb();
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436 overhead = le32_to_cpu(es->s_first_data_block);
1437
1438
1439
1440
1441
1442
1443 for (i = 0; i < sbi->s_groups_count; i++)
1444 overhead += ext2_bg_has_super(sb, i) +
1445 ext2_bg_num_gdb(sb, i);
1446
1447
1448
1449
1450
1451 overhead += (sbi->s_groups_count *
1452 (2 + sbi->s_itb_per_group));
1453 sbi->s_overhead_last = overhead;
1454 smp_wmb();
1455 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
1456 }
1457
1458 buf->f_type = EXT2_SUPER_MAGIC;
1459 buf->f_bsize = sb->s_blocksize;
1460 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
1461 buf->f_bfree = ext2_count_free_blocks(sb);
1462 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
1463 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
1464 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
1465 buf->f_bavail = 0;
1466 buf->f_files = le32_to_cpu(es->s_inodes_count);
1467 buf->f_ffree = ext2_count_free_inodes(sb);
1468 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
1469 buf->f_namelen = EXT2_NAME_LEN;
1470 fsid = le64_to_cpup((void *)es->s_uuid) ^
1471 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
1472 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
1473 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
1474 spin_unlock(&sbi->s_lock);
1475 return 0;
1476}
1477
1478static struct dentry *ext2_mount(struct file_system_type *fs_type,
1479 int flags, const char *dev_name, void *data)
1480{
1481 return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super);
1482}
1483
1484#ifdef CONFIG_QUOTA
1485
1486
1487
1488
1489
1490static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data,
1491 size_t len, loff_t off)
1492{
1493 struct inode *inode = sb_dqopt(sb)->files[type];
1494 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1495 int err = 0;
1496 int offset = off & (sb->s_blocksize - 1);
1497 int tocopy;
1498 size_t toread;
1499 struct buffer_head tmp_bh;
1500 struct buffer_head *bh;
1501 loff_t i_size = i_size_read(inode);
1502
1503 if (off > i_size)
1504 return 0;
1505 if (off+len > i_size)
1506 len = i_size-off;
1507 toread = len;
1508 while (toread > 0) {
1509 tocopy = sb->s_blocksize - offset < toread ?
1510 sb->s_blocksize - offset : toread;
1511
1512 tmp_bh.b_state = 0;
1513 tmp_bh.b_size = sb->s_blocksize;
1514 err = ext2_get_block(inode, blk, &tmp_bh, 0);
1515 if (err < 0)
1516 return err;
1517 if (!buffer_mapped(&tmp_bh))
1518 memset(data, 0, tocopy);
1519 else {
1520 bh = sb_bread(sb, tmp_bh.b_blocknr);
1521 if (!bh)
1522 return -EIO;
1523 memcpy(data, bh->b_data+offset, tocopy);
1524 brelse(bh);
1525 }
1526 offset = 0;
1527 toread -= tocopy;
1528 data += tocopy;
1529 blk++;
1530 }
1531 return len;
1532}
1533
1534
1535static ssize_t ext2_quota_write(struct super_block *sb, int type,
1536 const char *data, size_t len, loff_t off)
1537{
1538 struct inode *inode = sb_dqopt(sb)->files[type];
1539 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1540 int err = 0;
1541 int offset = off & (sb->s_blocksize - 1);
1542 int tocopy;
1543 size_t towrite = len;
1544 struct buffer_head tmp_bh;
1545 struct buffer_head *bh;
1546
1547 while (towrite > 0) {
1548 tocopy = sb->s_blocksize - offset < towrite ?
1549 sb->s_blocksize - offset : towrite;
1550
1551 tmp_bh.b_state = 0;
1552 tmp_bh.b_size = sb->s_blocksize;
1553 err = ext2_get_block(inode, blk, &tmp_bh, 1);
1554 if (err < 0)
1555 goto out;
1556 if (offset || tocopy != EXT2_BLOCK_SIZE(sb))
1557 bh = sb_bread(sb, tmp_bh.b_blocknr);
1558 else
1559 bh = sb_getblk(sb, tmp_bh.b_blocknr);
1560 if (unlikely(!bh)) {
1561 err = -EIO;
1562 goto out;
1563 }
1564 lock_buffer(bh);
1565 memcpy(bh->b_data+offset, data, tocopy);
1566 flush_dcache_page(bh->b_page);
1567 set_buffer_uptodate(bh);
1568 mark_buffer_dirty(bh);
1569 unlock_buffer(bh);
1570 brelse(bh);
1571 offset = 0;
1572 towrite -= tocopy;
1573 data += tocopy;
1574 blk++;
1575 }
1576out:
1577 if (len == towrite)
1578 return err;
1579 if (inode->i_size < off+len-towrite)
1580 i_size_write(inode, off+len-towrite);
1581 inode_inc_iversion(inode);
1582 inode->i_mtime = inode->i_ctime = current_time(inode);
1583 mark_inode_dirty(inode);
1584 return len - towrite;
1585}
1586
1587static int ext2_quota_on(struct super_block *sb, int type, int format_id,
1588 const struct path *path)
1589{
1590 int err;
1591 struct inode *inode;
1592
1593 err = dquot_quota_on(sb, type, format_id, path);
1594 if (err)
1595 return err;
1596
1597 inode = d_inode(path->dentry);
1598 inode_lock(inode);
1599 EXT2_I(inode)->i_flags |= EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL;
1600 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
1601 S_NOATIME | S_IMMUTABLE);
1602 inode_unlock(inode);
1603 mark_inode_dirty(inode);
1604
1605 return 0;
1606}
1607
1608static int ext2_quota_off(struct super_block *sb, int type)
1609{
1610 struct inode *inode = sb_dqopt(sb)->files[type];
1611 int err;
1612
1613 if (!inode || !igrab(inode))
1614 goto out;
1615
1616 err = dquot_quota_off(sb, type);
1617 if (err)
1618 goto out_put;
1619
1620 inode_lock(inode);
1621 EXT2_I(inode)->i_flags &= ~(EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL);
1622 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
1623 inode_unlock(inode);
1624 mark_inode_dirty(inode);
1625out_put:
1626 iput(inode);
1627 return err;
1628out:
1629 return dquot_quota_off(sb, type);
1630}
1631
1632#endif
1633
1634static struct file_system_type ext2_fs_type = {
1635 .owner = THIS_MODULE,
1636 .name = "ext2",
1637 .mount = ext2_mount,
1638 .kill_sb = kill_block_super,
1639 .fs_flags = FS_REQUIRES_DEV,
1640};
1641MODULE_ALIAS_FS("ext2");
1642
1643static int __init init_ext2_fs(void)
1644{
1645 int err;
1646
1647 err = init_inodecache();
1648 if (err)
1649 return err;
1650 err = register_filesystem(&ext2_fs_type);
1651 if (err)
1652 goto out;
1653 return 0;
1654out:
1655 destroy_inodecache();
1656 return err;
1657}
1658
1659static void __exit exit_ext2_fs(void)
1660{
1661 unregister_filesystem(&ext2_fs_type);
1662 destroy_inodecache();
1663}
1664
1665MODULE_AUTHOR("Remy Card and others");
1666MODULE_DESCRIPTION("Second Extended Filesystem");
1667MODULE_LICENSE("GPL");
1668module_init(init_ext2_fs)
1669module_exit(exit_ext2_fs)
1670
