1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
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
40static void ext2_write_super(struct super_block *sb);
41static int ext2_remount (struct super_block * sb, int * flags, char * data);
42static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf);
43static int ext2_sync_fs(struct super_block *sb, int wait);
44static int ext2_freeze(struct super_block *sb);
45static int ext2_unfreeze(struct super_block *sb);
46
47void 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 |= MS_RDONLY;
79 }
80}
81
82void 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
100
101void 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
117
118
119
120
121
122
123
124}
125
126#ifdef CONFIG_QUOTA
127static int ext2_quota_off(struct super_block *sb, int type);
128
129static 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
137static inline void ext2_quota_off_umount(struct super_block *sb)
138{
139}
140#endif
141
142static 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
178static struct kmem_cache * ext2_inode_cachep;
179
180static 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
195static 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
201static void ext2_destroy_inode(struct inode *inode)
202{
203 call_rcu(&inode->i_rcu, ext2_i_callback);
204}
205
206static 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
221static 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
233static void destroy_inodecache(void)
234{
235
236
237
238
239 rcu_barrier();
240 kmem_cache_destroy(ext2_inode_cachep);
241}
242
243static 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
332static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off);
333static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off);
334static int ext2_quota_on(struct super_block *sb, int type, int format_id,
335 const struct path *path);
336static struct dquot **ext2_get_dquots(struct inode *inode)
337{
338 return EXT2_I(inode)->i_dquot;
339}
340
341static 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
353static 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
372static 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
384
385
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
392 iput(inode);
393 return ERR_PTR(-ESTALE);
394 }
395 return inode;
396}
397
398static 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
405static 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
412static 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
418static 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;
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
438enum {
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
447static 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
482static int parse_options(char *options, struct super_block *sb)
483{
484 char *p;
485 struct ext2_sb_info *sbi = EXT2_SB(sb);
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 (sbi->s_mount_opt, MINIX_DF);
503 break;
504 case Opt_minix_df:
505 set_opt (sbi->s_mount_opt, MINIX_DF);
506 break;
507 case Opt_grpid:
508 set_opt (sbi->s_mount_opt, GRPID);
509 break;
510 case Opt_nogrpid:
511 clear_opt (sbi->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 sbi->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 sbi->s_resgid = gid;
533 break;
534 case Opt_sb:
535
536
537 break;
538 case Opt_err_panic:
539 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
540 clear_opt (sbi->s_mount_opt, ERRORS_RO);
541 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
542 break;
543 case Opt_err_ro:
544 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
545 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
546 set_opt (sbi->s_mount_opt, ERRORS_RO);
547 break;
548 case Opt_err_cont:
549 clear_opt (sbi->s_mount_opt, ERRORS_RO);
550 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
551 set_opt (sbi->s_mount_opt, ERRORS_CONT);
552 break;
553 case Opt_nouid32:
554 set_opt (sbi->s_mount_opt, NO_UID32);
555 break;
556 case Opt_nocheck:
557 clear_opt (sbi->s_mount_opt, CHECK);
558 break;
559 case Opt_debug:
560 set_opt (sbi->s_mount_opt, DEBUG);
561 break;
562 case Opt_oldalloc:
563 set_opt (sbi->s_mount_opt, OLDALLOC);
564 break;
565 case Opt_orlov:
566 clear_opt (sbi->s_mount_opt, OLDALLOC);
567 break;
568 case Opt_nobh:
569 set_opt (sbi->s_mount_opt, NOBH);
570 break;
571#ifdef CONFIG_EXT2_FS_XATTR
572 case Opt_user_xattr:
573 set_opt (sbi->s_mount_opt, XATTR_USER);
574 break;
575 case Opt_nouser_xattr:
576 clear_opt (sbi->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(sbi->s_mount_opt, POSIX_ACL);
588 break;
589 case Opt_noacl:
590 clear_opt(sbi->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(sbi->s_mount_opt, XIP);
602
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(sbi->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(sbi->s_mount_opt, USRQUOTA);
617 break;
618
619 case Opt_grpquota:
620 set_opt(sbi->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(sbi->s_mount_opt, RESERVATION);
633 ext2_msg(sb, KERN_INFO, "reservations ON");
634 break;
635 case Opt_noreservation:
636 clear_opt(sbi->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
648static 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 = MS_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
698static 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
750
751
752
753static 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
760
761
762
763
764
765
766 upper_limit = (1LL << 32) - 1;
767
768
769 upper_limit >>= (bits - 9);
770
771
772
773 meta_blocks = 1;
774
775 meta_blocks += 1 + (1LL << (bits-2));
776
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
795static 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
815static 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
834 err = -ENOMEM;
835 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
836 if (!sbi)
837 goto failed;
838
839 sbi->s_blockgroup_lock =
840 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
841 if (!sbi->s_blockgroup_lock) {
842 kfree(sbi);
843 goto failed;
844 }
845 sb->s_fs_info = sbi;
846 sbi->s_sb_block = sb_block;
847 sbi->s_daxdev = dax_dev;
848
849 spin_lock_init(&sbi->s_lock);
850
851
852
853
854
855
856
857
858 blocksize = sb_min_blocksize(sb, BLOCK_SIZE);
859 if (!blocksize) {
860 ext2_msg(sb, KERN_ERR, "error: unable to set blocksize");
861 goto failed_sbi;
862 }
863
864
865
866
867
868 if (blocksize != BLOCK_SIZE) {
869 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
870 offset = (sb_block*BLOCK_SIZE) % blocksize;
871 } else {
872 logic_sb_block = sb_block;
873 }
874
875 if (!(bh = sb_bread(sb, logic_sb_block))) {
876 ext2_msg(sb, KERN_ERR, "error: unable to read superblock");
877 goto failed_sbi;
878 }
879
880
881
882
883 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
884 sbi->s_es = es;
885 sb->s_magic = le16_to_cpu(es->s_magic);
886
887 if (sb->s_magic != EXT2_SUPER_MAGIC)
888 goto cantfind_ext2;
889
890
891 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
892 if (def_mount_opts & EXT2_DEFM_DEBUG)
893 set_opt(sbi->s_mount_opt, DEBUG);
894 if (def_mount_opts & EXT2_DEFM_BSDGROUPS)
895 set_opt(sbi->s_mount_opt, GRPID);
896 if (def_mount_opts & EXT2_DEFM_UID16)
897 set_opt(sbi->s_mount_opt, NO_UID32);
898#ifdef CONFIG_EXT2_FS_XATTR
899 if (def_mount_opts & EXT2_DEFM_XATTR_USER)
900 set_opt(sbi->s_mount_opt, XATTR_USER);
901#endif
902#ifdef CONFIG_EXT2_FS_POSIX_ACL
903 if (def_mount_opts & EXT2_DEFM_ACL)
904 set_opt(sbi->s_mount_opt, POSIX_ACL);
905#endif
906
907 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
908 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
909 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE)
910 set_opt(sbi->s_mount_opt, ERRORS_CONT);
911 else
912 set_opt(sbi->s_mount_opt, ERRORS_RO);
913
914 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
915 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
916
917 set_opt(sbi->s_mount_opt, RESERVATION);
918
919 if (!parse_options((char *) data, sb))
920 goto failed_mount;
921
922 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
923 ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ?
924 MS_POSIXACL : 0);
925 sb->s_iflags |= SB_I_CGROUPWB;
926
927 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV &&
928 (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) ||
929 EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
930 EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U)))
931 ext2_msg(sb, KERN_WARNING,
932 "warning: feature flags set on rev 0 fs, "
933 "running e2fsck is recommended");
934
935
936
937
938
939 features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP);
940 if (features) {
941 ext2_msg(sb, KERN_ERR, "error: couldn't mount because of "
942 "unsupported optional features (%x)",
943 le32_to_cpu(features));
944 goto failed_mount;
945 }
946 if (!sb_rdonly(sb) && (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){
947 ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of "
948 "unsupported optional features (%x)",
949 le32_to_cpu(features));
950 goto failed_mount;
951 }
952
953 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
954
955 if (sbi->s_mount_opt & EXT2_MOUNT_DAX) {
956 err = bdev_dax_supported(sb, blocksize);
957 if (err)
958 goto failed_mount;
959 }
960
961
962 if (sb->s_blocksize != blocksize) {
963 brelse(bh);
964
965 if (!sb_set_blocksize(sb, blocksize)) {
966 ext2_msg(sb, KERN_ERR,
967 "error: bad blocksize %d", blocksize);
968 goto failed_sbi;
969 }
970
971 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
972 offset = (sb_block*BLOCK_SIZE) % blocksize;
973 bh = sb_bread(sb, logic_sb_block);
974 if(!bh) {
975 ext2_msg(sb, KERN_ERR, "error: couldn't read"
976 "superblock on 2nd try");
977 goto failed_sbi;
978 }
979 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
980 sbi->s_es = es;
981 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) {
982 ext2_msg(sb, KERN_ERR, "error: magic mismatch");
983 goto failed_mount;
984 }
985 }
986
987 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits);
988 sb->s_max_links = EXT2_LINK_MAX;
989
990 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) {
991 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
992 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
993 } else {
994 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
995 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
996 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) ||
997 !is_power_of_2(sbi->s_inode_size) ||
998 (sbi->s_inode_size > blocksize)) {
999 ext2_msg(sb, KERN_ERR,
1000 "error: unsupported inode size: %d",
1001 sbi->s_inode_size);
1002 goto failed_mount;
1003 }
1004 }
1005
1006 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE <<
1007 le32_to_cpu(es->s_log_frag_size);
1008 if (sbi->s_frag_size == 0)
1009 goto cantfind_ext2;
1010 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size;
1011
1012 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1013 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1014 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1015
1016 if (EXT2_INODE_SIZE(sb) == 0)
1017 goto cantfind_ext2;
1018 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb);
1019 if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0)
1020 goto cantfind_ext2;
1021 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1022 sbi->s_inodes_per_block;
1023 sbi->s_desc_per_block = sb->s_blocksize /
1024 sizeof (struct ext2_group_desc);
1025 sbi->s_sbh = bh;
1026 sbi->s_mount_state = le16_to_cpu(es->s_state);
1027 sbi->s_addr_per_block_bits =
1028 ilog2 (EXT2_ADDR_PER_BLOCK(sb));
1029 sbi->s_desc_per_block_bits =
1030 ilog2 (EXT2_DESC_PER_BLOCK(sb));
1031
1032 if (sb->s_magic != EXT2_SUPER_MAGIC)
1033 goto cantfind_ext2;
1034
1035 if (sb->s_blocksize != bh->b_size) {
1036 if (!silent)
1037 ext2_msg(sb, KERN_ERR, "error: unsupported blocksize");
1038 goto failed_mount;
1039 }
1040
1041 if (sb->s_blocksize != sbi->s_frag_size) {
1042 ext2_msg(sb, KERN_ERR,
1043 "error: fragsize %lu != blocksize %lu"
1044 "(not supported yet)",
1045 sbi->s_frag_size, sb->s_blocksize);
1046 goto failed_mount;
1047 }
1048
1049 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) {
1050 ext2_msg(sb, KERN_ERR,
1051 "error: #blocks per group too big: %lu",
1052 sbi->s_blocks_per_group);
1053 goto failed_mount;
1054 }
1055 if (sbi->s_frags_per_group > sb->s_blocksize * 8) {
1056 ext2_msg(sb, KERN_ERR,
1057 "error: #fragments per group too big: %lu",
1058 sbi->s_frags_per_group);
1059 goto failed_mount;
1060 }
1061 if (sbi->s_inodes_per_group > sb->s_blocksize * 8) {
1062 ext2_msg(sb, KERN_ERR,
1063 "error: #inodes per group too big: %lu",
1064 sbi->s_inodes_per_group);
1065 goto failed_mount;
1066 }
1067
1068 if (EXT2_BLOCKS_PER_GROUP(sb) == 0)
1069 goto cantfind_ext2;
1070 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1071 le32_to_cpu(es->s_first_data_block) - 1)
1072 / EXT2_BLOCKS_PER_GROUP(sb)) + 1;
1073 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
1074 EXT2_DESC_PER_BLOCK(sb);
1075 sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL);
1076 if (sbi->s_group_desc == NULL) {
1077 ext2_msg(sb, KERN_ERR, "error: not enough memory");
1078 goto failed_mount;
1079 }
1080 bgl_lock_init(sbi->s_blockgroup_lock);
1081 sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL);
1082 if (!sbi->s_debts) {
1083 ext2_msg(sb, KERN_ERR, "error: not enough memory");
1084 goto failed_mount_group_desc;
1085 }
1086 for (i = 0; i < db_count; i++) {
1087 block = descriptor_loc(sb, logic_sb_block, i);
1088 sbi->s_group_desc[i] = sb_bread(sb, block);
1089 if (!sbi->s_group_desc[i]) {
1090 for (j = 0; j < i; j++)
1091 brelse (sbi->s_group_desc[j]);
1092 ext2_msg(sb, KERN_ERR,
1093 "error: unable to read group descriptors");
1094 goto failed_mount_group_desc;
1095 }
1096 }
1097 if (!ext2_check_descriptors (sb)) {
1098 ext2_msg(sb, KERN_ERR, "group descriptors corrupted");
1099 goto failed_mount2;
1100 }
1101 sbi->s_gdb_count = db_count;
1102 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1103 spin_lock_init(&sbi->s_next_gen_lock);
1104
1105
1106 spin_lock_init(&sbi->s_rsv_window_lock);
1107 sbi->s_rsv_window_root = RB_ROOT;
1108
1109
1110
1111
1112
1113
1114 sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
1115 sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
1116 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1117 sbi->s_rsv_window_head.rsv_goal_size = 0;
1118 ext2_rsv_window_add(sb, &sbi->s_rsv_window_head);
1119
1120 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1121 ext2_count_free_blocks(sb), GFP_KERNEL);
1122 if (!err) {
1123 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1124 ext2_count_free_inodes(sb), GFP_KERNEL);
1125 }
1126 if (!err) {
1127 err = percpu_counter_init(&sbi->s_dirs_counter,
1128 ext2_count_dirs(sb), GFP_KERNEL);
1129 }
1130 if (err) {
1131 ext2_msg(sb, KERN_ERR, "error: insufficient memory");
1132 goto failed_mount3;
1133 }
1134
1135#ifdef CONFIG_EXT2_FS_XATTR
1136 sbi->s_ea_block_cache = ext2_xattr_create_cache();
1137 if (!sbi->s_ea_block_cache) {
1138 ext2_msg(sb, KERN_ERR, "Failed to create ea_block_cache");
1139 goto failed_mount3;
1140 }
1141#endif
1142
1143
1144
1145 sb->s_op = &ext2_sops;
1146 sb->s_export_op = &ext2_export_ops;
1147 sb->s_xattr = ext2_xattr_handlers;
1148
1149#ifdef CONFIG_QUOTA
1150 sb->dq_op = &dquot_operations;
1151 sb->s_qcop = &ext2_quotactl_ops;
1152 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1153#endif
1154
1155 root = ext2_iget(sb, EXT2_ROOT_INO);
1156 if (IS_ERR(root)) {
1157 ret = PTR_ERR(root);
1158 goto failed_mount3;
1159 }
1160 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1161 iput(root);
1162 ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
1163 goto failed_mount3;
1164 }
1165
1166 sb->s_root = d_make_root(root);
1167 if (!sb->s_root) {
1168 ext2_msg(sb, KERN_ERR, "error: get root inode failed");
1169 ret = -ENOMEM;
1170 goto failed_mount3;
1171 }
1172 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL))
1173 ext2_msg(sb, KERN_WARNING,
1174 "warning: mounting ext3 filesystem as ext2");
1175 if (ext2_setup_super (sb, es, sb_rdonly(sb)))
1176 sb->s_flags |= MS_RDONLY;
1177 ext2_write_super(sb);
1178 return 0;
1179
1180cantfind_ext2:
1181 if (!silent)
1182 ext2_msg(sb, KERN_ERR,
1183 "error: can't find an ext2 filesystem on dev %s.",
1184 sb->s_id);
1185 goto failed_mount;
1186failed_mount3:
1187 if (sbi->s_ea_block_cache)
1188 ext2_xattr_destroy_cache(sbi->s_ea_block_cache);
1189 percpu_counter_destroy(&sbi->s_freeblocks_counter);
1190 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1191 percpu_counter_destroy(&sbi->s_dirs_counter);
1192failed_mount2:
1193 for (i = 0; i < db_count; i++)
1194 brelse(sbi->s_group_desc[i]);
1195failed_mount_group_desc:
1196 kfree(sbi->s_group_desc);
1197 kfree(sbi->s_debts);
1198failed_mount:
1199 brelse(bh);
1200failed_sbi:
1201 sb->s_fs_info = NULL;
1202 kfree(sbi->s_blockgroup_lock);
1203 kfree(sbi);
1204failed:
1205 fs_put_dax(dax_dev);
1206 return ret;
1207}
1208
1209static void ext2_clear_super_error(struct super_block *sb)
1210{
1211 struct buffer_head *sbh = EXT2_SB(sb)->s_sbh;
1212
1213 if (buffer_write_io_error(sbh)) {
1214
1215
1216
1217
1218
1219
1220
1221
1222 ext2_msg(sb, KERN_ERR,
1223 "previous I/O error to superblock detected\n");
1224 clear_buffer_write_io_error(sbh);
1225 set_buffer_uptodate(sbh);
1226 }
1227}
1228
1229void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es,
1230 int wait)
1231{
1232 ext2_clear_super_error(sb);
1233 spin_lock(&EXT2_SB(sb)->s_lock);
1234 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb));
1235 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb));
1236 es->s_wtime = cpu_to_le32(get_seconds());
1237
1238 spin_unlock(&EXT2_SB(sb)->s_lock);
1239 mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
1240 if (wait)
1241 sync_dirty_buffer(EXT2_SB(sb)->s_sbh);
1242}
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254static int ext2_sync_fs(struct super_block *sb, int wait)
1255{
1256 struct ext2_sb_info *sbi = EXT2_SB(sb);
1257 struct ext2_super_block *es = EXT2_SB(sb)->s_es;
1258
1259
1260
1261
1262
1263 dquot_writeback_dquots(sb, -1);
1264
1265 spin_lock(&sbi->s_lock);
1266 if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) {
1267 ext2_debug("setting valid to 0\n");
1268 es->s_state &= cpu_to_le16(~EXT2_VALID_FS);
1269 }
1270 spin_unlock(&sbi->s_lock);
1271 ext2_sync_super(sb, es, wait);
1272 return 0;
1273}
1274
1275static int ext2_freeze(struct super_block *sb)
1276{
1277 struct ext2_sb_info *sbi = EXT2_SB(sb);
1278
1279
1280
1281
1282
1283
1284 if (atomic_long_read(&sb->s_remove_count)) {
1285 ext2_sync_fs(sb, 1);
1286 return 0;
1287 }
1288
1289 spin_lock(&sbi->s_lock);
1290 sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state);
1291 spin_unlock(&sbi->s_lock);
1292 ext2_sync_super(sb, sbi->s_es, 1);
1293
1294 return 0;
1295}
1296
1297static int ext2_unfreeze(struct super_block *sb)
1298{
1299
1300 ext2_write_super(sb);
1301
1302 return 0;
1303}
1304
1305static void ext2_write_super(struct super_block *sb)
1306{
1307 if (!sb_rdonly(sb))
1308 ext2_sync_fs(sb, 1);
1309}
1310
1311static int ext2_remount (struct super_block * sb, int * flags, char * data)
1312{
1313 struct ext2_sb_info * sbi = EXT2_SB(sb);
1314 struct ext2_super_block * es;
1315 struct ext2_mount_options old_opts;
1316 unsigned long old_sb_flags;
1317 int err;
1318
1319 sync_filesystem(sb);
1320 spin_lock(&sbi->s_lock);
1321
1322
1323 old_sb_flags = sb->s_flags;
1324 old_opts.s_mount_opt = sbi->s_mount_opt;
1325 old_opts.s_resuid = sbi->s_resuid;
1326 old_opts.s_resgid = sbi->s_resgid;
1327
1328
1329
1330
1331 if (!parse_options(data, sb)) {
1332 err = -EINVAL;
1333 goto restore_opts;
1334 }
1335
1336 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1337 ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1338
1339 es = sbi->s_es;
1340 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT2_MOUNT_DAX) {
1341 ext2_msg(sb, KERN_WARNING, "warning: refusing change of "
1342 "dax flag with busy inodes while remounting");
1343 sbi->s_mount_opt ^= EXT2_MOUNT_DAX;
1344 }
1345 if ((bool)(*flags & MS_RDONLY) == sb_rdonly(sb)) {
1346 spin_unlock(&sbi->s_lock);
1347 return 0;
1348 }
1349 if (*flags & MS_RDONLY) {
1350 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS ||
1351 !(sbi->s_mount_state & EXT2_VALID_FS)) {
1352 spin_unlock(&sbi->s_lock);
1353 return 0;
1354 }
1355
1356
1357
1358
1359
1360 es->s_state = cpu_to_le16(sbi->s_mount_state);
1361 es->s_mtime = cpu_to_le32(get_seconds());
1362 spin_unlock(&sbi->s_lock);
1363
1364 err = dquot_suspend(sb, -1);
1365 if (err < 0) {
1366 spin_lock(&sbi->s_lock);
1367 goto restore_opts;
1368 }
1369
1370 ext2_sync_super(sb, es, 1);
1371 } else {
1372 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb,
1373 ~EXT2_FEATURE_RO_COMPAT_SUPP);
1374 if (ret) {
1375 ext2_msg(sb, KERN_WARNING,
1376 "warning: couldn't remount RDWR because of "
1377 "unsupported optional features (%x).",
1378 le32_to_cpu(ret));
1379 err = -EROFS;
1380 goto restore_opts;
1381 }
1382
1383
1384
1385
1386
1387 sbi->s_mount_state = le16_to_cpu(es->s_state);
1388 if (!ext2_setup_super (sb, es, 0))
1389 sb->s_flags &= ~MS_RDONLY;
1390 spin_unlock(&sbi->s_lock);
1391
1392 ext2_write_super(sb);
1393
1394 dquot_resume(sb, -1);
1395 }
1396
1397 return 0;
1398restore_opts:
1399 sbi->s_mount_opt = old_opts.s_mount_opt;
1400 sbi->s_resuid = old_opts.s_resuid;
1401 sbi->s_resgid = old_opts.s_resgid;
1402 sb->s_flags = old_sb_flags;
1403 spin_unlock(&sbi->s_lock);
1404 return err;
1405}
1406
1407static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf)
1408{
1409 struct super_block *sb = dentry->d_sb;
1410 struct ext2_sb_info *sbi = EXT2_SB(sb);
1411 struct ext2_super_block *es = sbi->s_es;
1412 u64 fsid;
1413
1414 spin_lock(&sbi->s_lock);
1415
1416 if (test_opt (sb, MINIX_DF))
1417 sbi->s_overhead_last = 0;
1418 else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
1419 unsigned long i, overhead = 0;
1420 smp_rmb();
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432 overhead = le32_to_cpu(es->s_first_data_block);
1433
1434
1435
1436
1437
1438
1439 for (i = 0; i < sbi->s_groups_count; i++)
1440 overhead += ext2_bg_has_super(sb, i) +
1441 ext2_bg_num_gdb(sb, i);
1442
1443
1444
1445
1446
1447 overhead += (sbi->s_groups_count *
1448 (2 + sbi->s_itb_per_group));
1449 sbi->s_overhead_last = overhead;
1450 smp_wmb();
1451 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
1452 }
1453
1454 buf->f_type = EXT2_SUPER_MAGIC;
1455 buf->f_bsize = sb->s_blocksize;
1456 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
1457 buf->f_bfree = ext2_count_free_blocks(sb);
1458 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
1459 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
1460 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
1461 buf->f_bavail = 0;
1462 buf->f_files = le32_to_cpu(es->s_inodes_count);
1463 buf->f_ffree = ext2_count_free_inodes(sb);
1464 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
1465 buf->f_namelen = EXT2_NAME_LEN;
1466 fsid = le64_to_cpup((void *)es->s_uuid) ^
1467 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
1468 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
1469 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
1470 spin_unlock(&sbi->s_lock);
1471 return 0;
1472}
1473
1474static struct dentry *ext2_mount(struct file_system_type *fs_type,
1475 int flags, const char *dev_name, void *data)
1476{
1477 return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super);
1478}
1479
1480#ifdef CONFIG_QUOTA
1481
1482
1483
1484
1485
1486static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data,
1487 size_t len, loff_t off)
1488{
1489 struct inode *inode = sb_dqopt(sb)->files[type];
1490 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1491 int err = 0;
1492 int offset = off & (sb->s_blocksize - 1);
1493 int tocopy;
1494 size_t toread;
1495 struct buffer_head tmp_bh;
1496 struct buffer_head *bh;
1497 loff_t i_size = i_size_read(inode);
1498
1499 if (off > i_size)
1500 return 0;
1501 if (off+len > i_size)
1502 len = i_size-off;
1503 toread = len;
1504 while (toread > 0) {
1505 tocopy = sb->s_blocksize - offset < toread ?
1506 sb->s_blocksize - offset : toread;
1507
1508 tmp_bh.b_state = 0;
1509 tmp_bh.b_size = sb->s_blocksize;
1510 err = ext2_get_block(inode, blk, &tmp_bh, 0);
1511 if (err < 0)
1512 return err;
1513 if (!buffer_mapped(&tmp_bh))
1514 memset(data, 0, tocopy);
1515 else {
1516 bh = sb_bread(sb, tmp_bh.b_blocknr);
1517 if (!bh)
1518 return -EIO;
1519 memcpy(data, bh->b_data+offset, tocopy);
1520 brelse(bh);
1521 }
1522 offset = 0;
1523 toread -= tocopy;
1524 data += tocopy;
1525 blk++;
1526 }
1527 return len;
1528}
1529
1530
1531static ssize_t ext2_quota_write(struct super_block *sb, int type,
1532 const char *data, size_t len, loff_t off)
1533{
1534 struct inode *inode = sb_dqopt(sb)->files[type];
1535 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1536 int err = 0;
1537 int offset = off & (sb->s_blocksize - 1);
1538 int tocopy;
1539 size_t towrite = len;
1540 struct buffer_head tmp_bh;
1541 struct buffer_head *bh;
1542
1543 while (towrite > 0) {
1544 tocopy = sb->s_blocksize - offset < towrite ?
1545 sb->s_blocksize - offset : towrite;
1546
1547 tmp_bh.b_state = 0;
1548 tmp_bh.b_size = sb->s_blocksize;
1549 err = ext2_get_block(inode, blk, &tmp_bh, 1);
1550 if (err < 0)
1551 goto out;
1552 if (offset || tocopy != EXT2_BLOCK_SIZE(sb))
1553 bh = sb_bread(sb, tmp_bh.b_blocknr);
1554 else
1555 bh = sb_getblk(sb, tmp_bh.b_blocknr);
1556 if (unlikely(!bh)) {
1557 err = -EIO;
1558 goto out;
1559 }
1560 lock_buffer(bh);
1561 memcpy(bh->b_data+offset, data, tocopy);
1562 flush_dcache_page(bh->b_page);
1563 set_buffer_uptodate(bh);
1564 mark_buffer_dirty(bh);
1565 unlock_buffer(bh);
1566 brelse(bh);
1567 offset = 0;
1568 towrite -= tocopy;
1569 data += tocopy;
1570 blk++;
1571 }
1572out:
1573 if (len == towrite)
1574 return err;
1575 if (inode->i_size < off+len-towrite)
1576 i_size_write(inode, off+len-towrite);
1577 inode->i_version++;
1578 inode->i_mtime = inode->i_ctime = current_time(inode);
1579 mark_inode_dirty(inode);
1580 return len - towrite;
1581}
1582
1583static int ext2_quota_on(struct super_block *sb, int type, int format_id,
1584 const struct path *path)
1585{
1586 int err;
1587 struct inode *inode;
1588
1589 err = dquot_quota_on(sb, type, format_id, path);
1590 if (err)
1591 return err;
1592
1593 inode = d_inode(path->dentry);
1594 inode_lock(inode);
1595 EXT2_I(inode)->i_flags |= EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL;
1596 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
1597 S_NOATIME | S_IMMUTABLE);
1598 inode_unlock(inode);
1599 mark_inode_dirty(inode);
1600
1601 return 0;
1602}
1603
1604static int ext2_quota_off(struct super_block *sb, int type)
1605{
1606 struct inode *inode = sb_dqopt(sb)->files[type];
1607 int err;
1608
1609 if (!inode || !igrab(inode))
1610 goto out;
1611
1612 err = dquot_quota_off(sb, type);
1613 if (err)
1614 goto out_put;
1615
1616 inode_lock(inode);
1617 EXT2_I(inode)->i_flags &= ~(EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL);
1618 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
1619 inode_unlock(inode);
1620 mark_inode_dirty(inode);
1621out_put:
1622 iput(inode);
1623 return err;
1624out:
1625 return dquot_quota_off(sb, type);
1626}
1627
1628#endif
1629
1630static struct file_system_type ext2_fs_type = {
1631 .owner = THIS_MODULE,
1632 .name = "ext2",
1633 .mount = ext2_mount,
1634 .kill_sb = kill_block_super,
1635 .fs_flags = FS_REQUIRES_DEV,
1636};
1637MODULE_ALIAS_FS("ext2");
1638
1639static int __init init_ext2_fs(void)
1640{
1641 int err;
1642
1643 err = init_inodecache();
1644 if (err)
1645 return err;
1646 err = register_filesystem(&ext2_fs_type);
1647 if (err)
1648 goto out;
1649 return 0;
1650out:
1651 destroy_inodecache();
1652 return err;
1653}
1654
1655static void __exit exit_ext2_fs(void)
1656{
1657 unregister_filesystem(&ext2_fs_type);
1658 destroy_inodecache();
1659}
1660
1661MODULE_AUTHOR("Remy Card and others");
1662MODULE_DESCRIPTION("Second Extended Filesystem");
1663MODULE_LICENSE("GPL");
1664module_init(init_ext2_fs)
1665module_exit(exit_ext2_fs)
1666
