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20#include <linux/module.h>
21#include <linux/string.h>
22#include <linux/fs.h>
23#include <linux/slab.h>
24#include <linux/init.h>
25#include <linux/blkdev.h>
26#include <linux/parser.h>
27#include <linux/random.h>
28#include <linux/buffer_head.h>
29#include <linux/exportfs.h>
30#include <linux/vfs.h>
31#include <linux/seq_file.h>
32#include <linux/mount.h>
33#include <linux/log2.h>
34#include <linux/quotaops.h>
35#include <linux/uaccess.h>
36#include <linux/dax.h>
37#include <linux/iversion.h>
38#include "ext2.h"
39#include "xattr.h"
40#include "acl.h"
41
42static void ext2_write_super(struct super_block *sb);
43static int ext2_remount (struct super_block * sb, int * flags, char * data);
44static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf);
45static int ext2_sync_fs(struct super_block *sb, int wait);
46static int ext2_freeze(struct super_block *sb);
47static int ext2_unfreeze(struct super_block *sb);
48
49void ext2_error(struct super_block *sb, const char *function,
50 const char *fmt, ...)
51{
52 struct va_format vaf;
53 va_list args;
54 struct ext2_sb_info *sbi = EXT2_SB(sb);
55 struct ext2_super_block *es = sbi->s_es;
56
57 if (!sb_rdonly(sb)) {
58 spin_lock(&sbi->s_lock);
59 sbi->s_mount_state |= EXT2_ERROR_FS;
60 es->s_state |= cpu_to_le16(EXT2_ERROR_FS);
61 spin_unlock(&sbi->s_lock);
62 ext2_sync_super(sb, es, 1);
63 }
64
65 va_start(args, fmt);
66
67 vaf.fmt = fmt;
68 vaf.va = &args;
69
70 printk(KERN_CRIT "EXT2-fs (%s): error: %s: %pV\n",
71 sb->s_id, function, &vaf);
72
73 va_end(args);
74
75 if (test_opt(sb, ERRORS_PANIC))
76 panic("EXT2-fs: panic from previous error\n");
77 if (!sb_rdonly(sb) && test_opt(sb, ERRORS_RO)) {
78 ext2_msg(sb, KERN_CRIT,
79 "error: remounting filesystem read-only");
80 sb->s_flags |= SB_RDONLY;
81 }
82}
83
84void ext2_msg(struct super_block *sb, const char *prefix,
85 const char *fmt, ...)
86{
87 struct va_format vaf;
88 va_list args;
89
90 va_start(args, fmt);
91
92 vaf.fmt = fmt;
93 vaf.va = &args;
94
95 printk("%sEXT2-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
96
97 va_end(args);
98}
99
100
101
102
103void ext2_update_dynamic_rev(struct super_block *sb)
104{
105 struct ext2_super_block *es = EXT2_SB(sb)->s_es;
106
107 if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV)
108 return;
109
110 ext2_msg(sb, KERN_WARNING,
111 "warning: updating to rev %d because of "
112 "new feature flag, running e2fsck is recommended",
113 EXT2_DYNAMIC_REV);
114
115 es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO);
116 es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE);
117 es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV);
118
119
120
121
122
123
124
125
126}
127
128#ifdef CONFIG_QUOTA
129static int ext2_quota_off(struct super_block *sb, int type);
130
131static void ext2_quota_off_umount(struct super_block *sb)
132{
133 int type;
134
135 for (type = 0; type < MAXQUOTAS; type++)
136 ext2_quota_off(sb, type);
137}
138#else
139static inline void ext2_quota_off_umount(struct super_block *sb)
140{
141}
142#endif
143
144static void ext2_put_super (struct super_block * sb)
145{
146 int db_count;
147 int i;
148 struct ext2_sb_info *sbi = EXT2_SB(sb);
149
150 ext2_quota_off_umount(sb);
151
152 ext2_xattr_destroy_cache(sbi->s_ea_block_cache);
153 sbi->s_ea_block_cache = NULL;
154
155 if (!sb_rdonly(sb)) {
156 struct ext2_super_block *es = sbi->s_es;
157
158 spin_lock(&sbi->s_lock);
159 es->s_state = cpu_to_le16(sbi->s_mount_state);
160 spin_unlock(&sbi->s_lock);
161 ext2_sync_super(sb, es, 1);
162 }
163 db_count = sbi->s_gdb_count;
164 for (i = 0; i < db_count; i++)
165 brelse(sbi->s_group_desc[i]);
166 kfree(sbi->s_group_desc);
167 kfree(sbi->s_debts);
168 percpu_counter_destroy(&sbi->s_freeblocks_counter);
169 percpu_counter_destroy(&sbi->s_freeinodes_counter);
170 percpu_counter_destroy(&sbi->s_dirs_counter);
171 brelse (sbi->s_sbh);
172 sb->s_fs_info = NULL;
173 kfree(sbi->s_blockgroup_lock);
174 fs_put_dax(sbi->s_daxdev);
175 kfree(sbi);
176}
177
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 inode_set_iversion(&ei->vfs_inode, 1);
188#ifdef CONFIG_QUOTA
189 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
190#endif
191
192 return &ei->vfs_inode;
193}
194
195static void ext2_free_in_core_inode(struct inode *inode)
196{
197 kmem_cache_free(ext2_inode_cachep, EXT2_I(inode));
198}
199
200static void init_once(void *foo)
201{
202 struct ext2_inode_info *ei = (struct ext2_inode_info *) foo;
203
204 rwlock_init(&ei->i_meta_lock);
205#ifdef CONFIG_EXT2_FS_XATTR
206 init_rwsem(&ei->xattr_sem);
207#endif
208 mutex_init(&ei->truncate_mutex);
209 inode_init_once(&ei->vfs_inode);
210}
211
212static int __init init_inodecache(void)
213{
214 ext2_inode_cachep = kmem_cache_create_usercopy("ext2_inode_cache",
215 sizeof(struct ext2_inode_info), 0,
216 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
217 SLAB_ACCOUNT),
218 offsetof(struct ext2_inode_info, i_data),
219 sizeof_field(struct ext2_inode_info, i_data),
220 init_once);
221 if (ext2_inode_cachep == NULL)
222 return -ENOMEM;
223 return 0;
224}
225
226static void destroy_inodecache(void)
227{
228
229
230
231
232 rcu_barrier();
233 kmem_cache_destroy(ext2_inode_cachep);
234}
235
236static int ext2_show_options(struct seq_file *seq, struct dentry *root)
237{
238 struct super_block *sb = root->d_sb;
239 struct ext2_sb_info *sbi = EXT2_SB(sb);
240 struct ext2_super_block *es = sbi->s_es;
241 unsigned long def_mount_opts;
242
243 spin_lock(&sbi->s_lock);
244 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
245
246 if (sbi->s_sb_block != 1)
247 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
248 if (test_opt(sb, MINIX_DF))
249 seq_puts(seq, ",minixdf");
250 if (test_opt(sb, GRPID))
251 seq_puts(seq, ",grpid");
252 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS))
253 seq_puts(seq, ",nogrpid");
254 if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT2_DEF_RESUID)) ||
255 le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) {
256 seq_printf(seq, ",resuid=%u",
257 from_kuid_munged(&init_user_ns, sbi->s_resuid));
258 }
259 if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT2_DEF_RESGID)) ||
260 le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) {
261 seq_printf(seq, ",resgid=%u",
262 from_kgid_munged(&init_user_ns, sbi->s_resgid));
263 }
264 if (test_opt(sb, ERRORS_RO)) {
265 int def_errors = le16_to_cpu(es->s_errors);
266
267 if (def_errors == EXT2_ERRORS_PANIC ||
268 def_errors == EXT2_ERRORS_CONTINUE) {
269 seq_puts(seq, ",errors=remount-ro");
270 }
271 }
272 if (test_opt(sb, ERRORS_CONT))
273 seq_puts(seq, ",errors=continue");
274 if (test_opt(sb, ERRORS_PANIC))
275 seq_puts(seq, ",errors=panic");
276 if (test_opt(sb, NO_UID32))
277 seq_puts(seq, ",nouid32");
278 if (test_opt(sb, DEBUG))
279 seq_puts(seq, ",debug");
280 if (test_opt(sb, OLDALLOC))
281 seq_puts(seq, ",oldalloc");
282
283#ifdef CONFIG_EXT2_FS_XATTR
284 if (test_opt(sb, XATTR_USER))
285 seq_puts(seq, ",user_xattr");
286 if (!test_opt(sb, XATTR_USER) &&
287 (def_mount_opts & EXT2_DEFM_XATTR_USER)) {
288 seq_puts(seq, ",nouser_xattr");
289 }
290#endif
291
292#ifdef CONFIG_EXT2_FS_POSIX_ACL
293 if (test_opt(sb, POSIX_ACL))
294 seq_puts(seq, ",acl");
295 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL))
296 seq_puts(seq, ",noacl");
297#endif
298
299 if (test_opt(sb, NOBH))
300 seq_puts(seq, ",nobh");
301
302 if (test_opt(sb, USRQUOTA))
303 seq_puts(seq, ",usrquota");
304
305 if (test_opt(sb, GRPQUOTA))
306 seq_puts(seq, ",grpquota");
307
308 if (test_opt(sb, XIP))
309 seq_puts(seq, ",xip");
310
311 if (test_opt(sb, DAX))
312 seq_puts(seq, ",dax");
313
314 if (!test_opt(sb, RESERVATION))
315 seq_puts(seq, ",noreservation");
316
317 spin_unlock(&sbi->s_lock);
318 return 0;
319}
320
321#ifdef CONFIG_QUOTA
322static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off);
323static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off);
324static int ext2_quota_on(struct super_block *sb, int type, int format_id,
325 const struct path *path);
326static struct dquot **ext2_get_dquots(struct inode *inode)
327{
328 return EXT2_I(inode)->i_dquot;
329}
330
331static const struct quotactl_ops ext2_quotactl_ops = {
332 .quota_on = ext2_quota_on,
333 .quota_off = ext2_quota_off,
334 .quota_sync = dquot_quota_sync,
335 .get_state = dquot_get_state,
336 .set_info = dquot_set_dqinfo,
337 .get_dqblk = dquot_get_dqblk,
338 .set_dqblk = dquot_set_dqblk,
339 .get_nextdqblk = dquot_get_next_dqblk,
340};
341#endif
342
343static const struct super_operations ext2_sops = {
344 .alloc_inode = ext2_alloc_inode,
345 .free_inode = ext2_free_in_core_inode,
346 .write_inode = ext2_write_inode,
347 .evict_inode = ext2_evict_inode,
348 .put_super = ext2_put_super,
349 .sync_fs = ext2_sync_fs,
350 .freeze_fs = ext2_freeze,
351 .unfreeze_fs = ext2_unfreeze,
352 .statfs = ext2_statfs,
353 .remount_fs = ext2_remount,
354 .show_options = ext2_show_options,
355#ifdef CONFIG_QUOTA
356 .quota_read = ext2_quota_read,
357 .quota_write = ext2_quota_write,
358 .get_dquots = ext2_get_dquots,
359#endif
360};
361
362static struct inode *ext2_nfs_get_inode(struct super_block *sb,
363 u64 ino, u32 generation)
364{
365 struct inode *inode;
366
367 if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO)
368 return ERR_PTR(-ESTALE);
369 if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count))
370 return ERR_PTR(-ESTALE);
371
372
373
374
375
376
377 inode = ext2_iget(sb, ino);
378 if (IS_ERR(inode))
379 return ERR_CAST(inode);
380 if (generation && inode->i_generation != generation) {
381
382 iput(inode);
383 return ERR_PTR(-ESTALE);
384 }
385 return inode;
386}
387
388static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid,
389 int fh_len, int fh_type)
390{
391 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
392 ext2_nfs_get_inode);
393}
394
395static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid,
396 int fh_len, int fh_type)
397{
398 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
399 ext2_nfs_get_inode);
400}
401
402static const struct export_operations ext2_export_ops = {
403 .fh_to_dentry = ext2_fh_to_dentry,
404 .fh_to_parent = ext2_fh_to_parent,
405 .get_parent = ext2_get_parent,
406};
407
408static unsigned long get_sb_block(void **data)
409{
410 unsigned long sb_block;
411 char *options = (char *) *data;
412
413 if (!options || strncmp(options, "sb=", 3) != 0)
414 return 1;
415 options += 3;
416 sb_block = simple_strtoul(options, &options, 0);
417 if (*options && *options != ',') {
418 printk("EXT2-fs: Invalid sb specification: %s\n",
419 (char *) *data);
420 return 1;
421 }
422 if (*options == ',')
423 options++;
424 *data = (void *) options;
425 return sb_block;
426}
427
428enum {
429 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
430 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic,
431 Opt_err_ro, Opt_nouid32, Opt_debug,
432 Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr,
433 Opt_acl, Opt_noacl, Opt_xip, Opt_dax, Opt_ignore, Opt_err, Opt_quota,
434 Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation
435};
436
437static const match_table_t tokens = {
438 {Opt_bsd_df, "bsddf"},
439 {Opt_minix_df, "minixdf"},
440 {Opt_grpid, "grpid"},
441 {Opt_grpid, "bsdgroups"},
442 {Opt_nogrpid, "nogrpid"},
443 {Opt_nogrpid, "sysvgroups"},
444 {Opt_resgid, "resgid=%u"},
445 {Opt_resuid, "resuid=%u"},
446 {Opt_sb, "sb=%u"},
447 {Opt_err_cont, "errors=continue"},
448 {Opt_err_panic, "errors=panic"},
449 {Opt_err_ro, "errors=remount-ro"},
450 {Opt_nouid32, "nouid32"},
451 {Opt_debug, "debug"},
452 {Opt_oldalloc, "oldalloc"},
453 {Opt_orlov, "orlov"},
454 {Opt_nobh, "nobh"},
455 {Opt_user_xattr, "user_xattr"},
456 {Opt_nouser_xattr, "nouser_xattr"},
457 {Opt_acl, "acl"},
458 {Opt_noacl, "noacl"},
459 {Opt_xip, "xip"},
460 {Opt_dax, "dax"},
461 {Opt_grpquota, "grpquota"},
462 {Opt_ignore, "noquota"},
463 {Opt_quota, "quota"},
464 {Opt_usrquota, "usrquota"},
465 {Opt_reservation, "reservation"},
466 {Opt_noreservation, "noreservation"},
467 {Opt_err, NULL}
468};
469
470static int parse_options(char *options, struct super_block *sb,
471 struct ext2_mount_options *opts)
472{
473 char *p;
474 substring_t args[MAX_OPT_ARGS];
475 int option;
476 kuid_t uid;
477 kgid_t gid;
478
479 if (!options)
480 return 1;
481
482 while ((p = strsep (&options, ",")) != NULL) {
483 int token;
484 if (!*p)
485 continue;
486
487 token = match_token(p, tokens, args);
488 switch (token) {
489 case Opt_bsd_df:
490 clear_opt (opts->s_mount_opt, MINIX_DF);
491 break;
492 case Opt_minix_df:
493 set_opt (opts->s_mount_opt, MINIX_DF);
494 break;
495 case Opt_grpid:
496 set_opt (opts->s_mount_opt, GRPID);
497 break;
498 case Opt_nogrpid:
499 clear_opt (opts->s_mount_opt, GRPID);
500 break;
501 case Opt_resuid:
502 if (match_int(&args[0], &option))
503 return 0;
504 uid = make_kuid(current_user_ns(), option);
505 if (!uid_valid(uid)) {
506 ext2_msg(sb, KERN_ERR, "Invalid uid value %d", option);
507 return 0;
508
509 }
510 opts->s_resuid = uid;
511 break;
512 case Opt_resgid:
513 if (match_int(&args[0], &option))
514 return 0;
515 gid = make_kgid(current_user_ns(), option);
516 if (!gid_valid(gid)) {
517 ext2_msg(sb, KERN_ERR, "Invalid gid value %d", option);
518 return 0;
519 }
520 opts->s_resgid = gid;
521 break;
522 case Opt_sb:
523
524
525 break;
526 case Opt_err_panic:
527 clear_opt (opts->s_mount_opt, ERRORS_CONT);
528 clear_opt (opts->s_mount_opt, ERRORS_RO);
529 set_opt (opts->s_mount_opt, ERRORS_PANIC);
530 break;
531 case Opt_err_ro:
532 clear_opt (opts->s_mount_opt, ERRORS_CONT);
533 clear_opt (opts->s_mount_opt, ERRORS_PANIC);
534 set_opt (opts->s_mount_opt, ERRORS_RO);
535 break;
536 case Opt_err_cont:
537 clear_opt (opts->s_mount_opt, ERRORS_RO);
538 clear_opt (opts->s_mount_opt, ERRORS_PANIC);
539 set_opt (opts->s_mount_opt, ERRORS_CONT);
540 break;
541 case Opt_nouid32:
542 set_opt (opts->s_mount_opt, NO_UID32);
543 break;
544 case Opt_debug:
545 set_opt (opts->s_mount_opt, DEBUG);
546 break;
547 case Opt_oldalloc:
548 set_opt (opts->s_mount_opt, OLDALLOC);
549 break;
550 case Opt_orlov:
551 clear_opt (opts->s_mount_opt, OLDALLOC);
552 break;
553 case Opt_nobh:
554 set_opt (opts->s_mount_opt, NOBH);
555 break;
556#ifdef CONFIG_EXT2_FS_XATTR
557 case Opt_user_xattr:
558 set_opt (opts->s_mount_opt, XATTR_USER);
559 break;
560 case Opt_nouser_xattr:
561 clear_opt (opts->s_mount_opt, XATTR_USER);
562 break;
563#else
564 case Opt_user_xattr:
565 case Opt_nouser_xattr:
566 ext2_msg(sb, KERN_INFO, "(no)user_xattr options"
567 "not supported");
568 break;
569#endif
570#ifdef CONFIG_EXT2_FS_POSIX_ACL
571 case Opt_acl:
572 set_opt(opts->s_mount_opt, POSIX_ACL);
573 break;
574 case Opt_noacl:
575 clear_opt(opts->s_mount_opt, POSIX_ACL);
576 break;
577#else
578 case Opt_acl:
579 case Opt_noacl:
580 ext2_msg(sb, KERN_INFO,
581 "(no)acl options not supported");
582 break;
583#endif
584 case Opt_xip:
585 ext2_msg(sb, KERN_INFO, "use dax instead of xip");
586 set_opt(opts->s_mount_opt, XIP);
587 fallthrough;
588 case Opt_dax:
589#ifdef CONFIG_FS_DAX
590 ext2_msg(sb, KERN_WARNING,
591 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
592 set_opt(opts->s_mount_opt, DAX);
593#else
594 ext2_msg(sb, KERN_INFO, "dax option not supported");
595#endif
596 break;
597
598#if defined(CONFIG_QUOTA)
599 case Opt_quota:
600 case Opt_usrquota:
601 set_opt(opts->s_mount_opt, USRQUOTA);
602 break;
603
604 case Opt_grpquota:
605 set_opt(opts->s_mount_opt, GRPQUOTA);
606 break;
607#else
608 case Opt_quota:
609 case Opt_usrquota:
610 case Opt_grpquota:
611 ext2_msg(sb, KERN_INFO,
612 "quota operations not supported");
613 break;
614#endif
615
616 case Opt_reservation:
617 set_opt(opts->s_mount_opt, RESERVATION);
618 ext2_msg(sb, KERN_INFO, "reservations ON");
619 break;
620 case Opt_noreservation:
621 clear_opt(opts->s_mount_opt, RESERVATION);
622 ext2_msg(sb, KERN_INFO, "reservations OFF");
623 break;
624 case Opt_ignore:
625 break;
626 default:
627 return 0;
628 }
629 }
630 return 1;
631}
632
633static int ext2_setup_super (struct super_block * sb,
634 struct ext2_super_block * es,
635 int read_only)
636{
637 int res = 0;
638 struct ext2_sb_info *sbi = EXT2_SB(sb);
639
640 if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) {
641 ext2_msg(sb, KERN_ERR,
642 "error: revision level too high, "
643 "forcing read-only mode");
644 res = SB_RDONLY;
645 }
646 if (read_only)
647 return res;
648 if (!(sbi->s_mount_state & EXT2_VALID_FS))
649 ext2_msg(sb, KERN_WARNING,
650 "warning: mounting unchecked fs, "
651 "running e2fsck is recommended");
652 else if ((sbi->s_mount_state & EXT2_ERROR_FS))
653 ext2_msg(sb, KERN_WARNING,
654 "warning: mounting fs with errors, "
655 "running e2fsck is recommended");
656 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
657 le16_to_cpu(es->s_mnt_count) >=
658 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
659 ext2_msg(sb, KERN_WARNING,
660 "warning: maximal mount count reached, "
661 "running e2fsck is recommended");
662 else if (le32_to_cpu(es->s_checkinterval) &&
663 (le32_to_cpu(es->s_lastcheck) +
664 le32_to_cpu(es->s_checkinterval) <=
665 ktime_get_real_seconds()))
666 ext2_msg(sb, KERN_WARNING,
667 "warning: checktime reached, "
668 "running e2fsck is recommended");
669 if (!le16_to_cpu(es->s_max_mnt_count))
670 es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT);
671 le16_add_cpu(&es->s_mnt_count, 1);
672 if (test_opt (sb, DEBUG))
673 ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, fs=%lu, gc=%lu, "
674 "bpg=%lu, ipg=%lu, mo=%04lx]",
675 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize,
676 sbi->s_frag_size,
677 sbi->s_groups_count,
678 EXT2_BLOCKS_PER_GROUP(sb),
679 EXT2_INODES_PER_GROUP(sb),
680 sbi->s_mount_opt);
681 return res;
682}
683
684static int ext2_check_descriptors(struct super_block *sb)
685{
686 int i;
687 struct ext2_sb_info *sbi = EXT2_SB(sb);
688
689 ext2_debug ("Checking group descriptors");
690
691 for (i = 0; i < sbi->s_groups_count; i++) {
692 struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL);
693 ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i);
694 ext2_fsblk_t last_block = ext2_group_last_block_no(sb, i);
695
696 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
697 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
698 {
699 ext2_error (sb, "ext2_check_descriptors",
700 "Block bitmap for group %d"
701 " not in group (block %lu)!",
702 i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap));
703 return 0;
704 }
705 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
706 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
707 {
708 ext2_error (sb, "ext2_check_descriptors",
709 "Inode bitmap for group %d"
710 " not in group (block %lu)!",
711 i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap));
712 return 0;
713 }
714 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
715 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
716 last_block)
717 {
718 ext2_error (sb, "ext2_check_descriptors",
719 "Inode table for group %d"
720 " not in group (block %lu)!",
721 i, (unsigned long) le32_to_cpu(gdp->bg_inode_table));
722 return 0;
723 }
724 }
725 return 1;
726}
727
728
729
730
731
732
733static loff_t ext2_max_size(int bits)
734{
735 loff_t res = EXT2_NDIR_BLOCKS;
736 int meta_blocks;
737 unsigned int upper_limit;
738 unsigned int ppb = 1 << (bits-2);
739
740
741
742
743
744
745
746
747 upper_limit = (1LL << 32) - 1;
748
749
750 upper_limit >>= (bits - 9);
751
752
753 res += 1LL << (bits-2);
754 res += 1LL << (2*(bits-2));
755 res += 1LL << (3*(bits-2));
756
757 if (res < upper_limit)
758 goto check_lfs;
759
760 res = upper_limit;
761
762 upper_limit -= EXT2_NDIR_BLOCKS;
763
764 meta_blocks = 1;
765 upper_limit -= ppb;
766
767 if (upper_limit < ppb * ppb) {
768 meta_blocks += 1 + DIV_ROUND_UP(upper_limit, ppb);
769 res -= meta_blocks;
770 goto check_lfs;
771 }
772 meta_blocks += 1 + ppb;
773 upper_limit -= ppb * ppb;
774
775 meta_blocks += 1 + DIV_ROUND_UP(upper_limit, ppb) +
776 DIV_ROUND_UP(upper_limit, ppb*ppb);
777 res -= meta_blocks;
778check_lfs:
779 res <<= bits;
780 if (res > MAX_LFS_FILESIZE)
781 res = MAX_LFS_FILESIZE;
782
783 return res;
784}
785
786static unsigned long descriptor_loc(struct super_block *sb,
787 unsigned long logic_sb_block,
788 int nr)
789{
790 struct ext2_sb_info *sbi = EXT2_SB(sb);
791 unsigned long bg, first_meta_bg;
792
793 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
794
795 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) ||
796 nr < first_meta_bg)
797 return (logic_sb_block + nr + 1);
798 bg = sbi->s_desc_per_block * nr;
799
800 return ext2_group_first_block_no(sb, bg) + ext2_bg_has_super(sb, bg);
801}
802
803static int ext2_fill_super(struct super_block *sb, void *data, int silent)
804{
805 struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev);
806 struct buffer_head * bh;
807 struct ext2_sb_info * sbi;
808 struct ext2_super_block * es;
809 struct inode *root;
810 unsigned long block;
811 unsigned long sb_block = get_sb_block(&data);
812 unsigned long logic_sb_block;
813 unsigned long offset = 0;
814 unsigned long def_mount_opts;
815 long ret = -ENOMEM;
816 int blocksize = BLOCK_SIZE;
817 int db_count;
818 int i, j;
819 __le32 features;
820 int err;
821 struct ext2_mount_options opts;
822
823 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
824 if (!sbi)
825 goto failed;
826
827 sbi->s_blockgroup_lock =
828 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
829 if (!sbi->s_blockgroup_lock) {
830 kfree(sbi);
831 goto failed;
832 }
833 sb->s_fs_info = sbi;
834 sbi->s_sb_block = sb_block;
835 sbi->s_daxdev = dax_dev;
836
837 spin_lock_init(&sbi->s_lock);
838 ret = -EINVAL;
839
840
841
842
843
844
845
846
847 blocksize = sb_min_blocksize(sb, BLOCK_SIZE);
848 if (!blocksize) {
849 ext2_msg(sb, KERN_ERR, "error: unable to set blocksize");
850 goto failed_sbi;
851 }
852
853
854
855
856
857 if (blocksize != BLOCK_SIZE) {
858 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
859 offset = (sb_block*BLOCK_SIZE) % blocksize;
860 } else {
861 logic_sb_block = sb_block;
862 }
863
864 if (!(bh = sb_bread(sb, logic_sb_block))) {
865 ext2_msg(sb, KERN_ERR, "error: unable to read superblock");
866 goto failed_sbi;
867 }
868
869
870
871
872 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
873 sbi->s_es = es;
874 sb->s_magic = le16_to_cpu(es->s_magic);
875
876 if (sb->s_magic != EXT2_SUPER_MAGIC)
877 goto cantfind_ext2;
878
879 opts.s_mount_opt = 0;
880
881 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
882 if (def_mount_opts & EXT2_DEFM_DEBUG)
883 set_opt(opts.s_mount_opt, DEBUG);
884 if (def_mount_opts & EXT2_DEFM_BSDGROUPS)
885 set_opt(opts.s_mount_opt, GRPID);
886 if (def_mount_opts & EXT2_DEFM_UID16)
887 set_opt(opts.s_mount_opt, NO_UID32);
888#ifdef CONFIG_EXT2_FS_XATTR
889 if (def_mount_opts & EXT2_DEFM_XATTR_USER)
890 set_opt(opts.s_mount_opt, XATTR_USER);
891#endif
892#ifdef CONFIG_EXT2_FS_POSIX_ACL
893 if (def_mount_opts & EXT2_DEFM_ACL)
894 set_opt(opts.s_mount_opt, POSIX_ACL);
895#endif
896
897 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
898 set_opt(opts.s_mount_opt, ERRORS_PANIC);
899 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE)
900 set_opt(opts.s_mount_opt, ERRORS_CONT);
901 else
902 set_opt(opts.s_mount_opt, ERRORS_RO);
903
904 opts.s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
905 opts.s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
906
907 set_opt(opts.s_mount_opt, RESERVATION);
908
909 if (!parse_options((char *) data, sb, &opts))
910 goto failed_mount;
911
912 sbi->s_mount_opt = opts.s_mount_opt;
913 sbi->s_resuid = opts.s_resuid;
914 sbi->s_resgid = opts.s_resgid;
915
916 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
917 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
918 sb->s_iflags |= SB_I_CGROUPWB;
919
920 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV &&
921 (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) ||
922 EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
923 EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U)))
924 ext2_msg(sb, KERN_WARNING,
925 "warning: feature flags set on rev 0 fs, "
926 "running e2fsck is recommended");
927
928
929
930
931
932 features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP);
933 if (features) {
934 ext2_msg(sb, KERN_ERR, "error: couldn't mount because of "
935 "unsupported optional features (%x)",
936 le32_to_cpu(features));
937 goto failed_mount;
938 }
939 if (!sb_rdonly(sb) && (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){
940 ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of "
941 "unsupported optional features (%x)",
942 le32_to_cpu(features));
943 goto failed_mount;
944 }
945
946 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
947
948 if (test_opt(sb, DAX)) {
949 if (!dax_supported(dax_dev, sb->s_bdev, blocksize, 0,
950 bdev_nr_sectors(sb->s_bdev))) {
951 ext2_msg(sb, KERN_ERR,
952 "DAX unsupported by block device. Turning off DAX.");
953 clear_opt(sbi->s_mount_opt, DAX);
954 }
955 }
956
957
958 if (sb->s_blocksize != blocksize) {
959 brelse(bh);
960
961 if (!sb_set_blocksize(sb, blocksize)) {
962 ext2_msg(sb, KERN_ERR,
963 "error: bad blocksize %d", blocksize);
964 goto failed_sbi;
965 }
966
967 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
968 offset = (sb_block*BLOCK_SIZE) % blocksize;
969 bh = sb_bread(sb, logic_sb_block);
970 if(!bh) {
971 ext2_msg(sb, KERN_ERR, "error: couldn't read"
972 "superblock on 2nd try");
973 goto failed_sbi;
974 }
975 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
976 sbi->s_es = es;
977 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) {
978 ext2_msg(sb, KERN_ERR, "error: magic mismatch");
979 goto failed_mount;
980 }
981 }
982
983 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits);
984 sb->s_max_links = EXT2_LINK_MAX;
985 sb->s_time_min = S32_MIN;
986 sb->s_time_max = S32_MAX;
987
988 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) {
989 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
990 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
991 } else {
992 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
993 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
994 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) ||
995 !is_power_of_2(sbi->s_inode_size) ||
996 (sbi->s_inode_size > blocksize)) {
997 ext2_msg(sb, KERN_ERR,
998 "error: unsupported inode size: %d",
999 sbi->s_inode_size);
1000 goto failed_mount;
1001 }
1002 }
1003
1004 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE <<
1005 le32_to_cpu(es->s_log_frag_size);
1006 if (sbi->s_frag_size == 0)
1007 goto cantfind_ext2;
1008 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size;
1009
1010 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1011 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1012 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1013
1014 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb);
1015 if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0)
1016 goto cantfind_ext2;
1017 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1018 sbi->s_inodes_per_block;
1019 sbi->s_desc_per_block = sb->s_blocksize /
1020 sizeof (struct ext2_group_desc);
1021 sbi->s_sbh = bh;
1022 sbi->s_mount_state = le16_to_cpu(es->s_state);
1023 sbi->s_addr_per_block_bits =
1024 ilog2 (EXT2_ADDR_PER_BLOCK(sb));
1025 sbi->s_desc_per_block_bits =
1026 ilog2 (EXT2_DESC_PER_BLOCK(sb));
1027
1028 if (sb->s_magic != EXT2_SUPER_MAGIC)
1029 goto cantfind_ext2;
1030
1031 if (sb->s_blocksize != bh->b_size) {
1032 if (!silent)
1033 ext2_msg(sb, KERN_ERR, "error: unsupported blocksize");
1034 goto failed_mount;
1035 }
1036
1037 if (sb->s_blocksize != sbi->s_frag_size) {
1038 ext2_msg(sb, KERN_ERR,
1039 "error: fragsize %lu != blocksize %lu"
1040 "(not supported yet)",
1041 sbi->s_frag_size, sb->s_blocksize);
1042 goto failed_mount;
1043 }
1044
1045 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) {
1046 ext2_msg(sb, KERN_ERR,
1047 "error: #blocks per group too big: %lu",
1048 sbi->s_blocks_per_group);
1049 goto failed_mount;
1050 }
1051 if (sbi->s_frags_per_group > sb->s_blocksize * 8) {
1052 ext2_msg(sb, KERN_ERR,
1053 "error: #fragments per group too big: %lu",
1054 sbi->s_frags_per_group);
1055 goto failed_mount;
1056 }
1057 if (sbi->s_inodes_per_group > sb->s_blocksize * 8) {
1058 ext2_msg(sb, KERN_ERR,
1059 "error: #inodes per group too big: %lu",
1060 sbi->s_inodes_per_group);
1061 goto failed_mount;
1062 }
1063
1064 if (EXT2_BLOCKS_PER_GROUP(sb) == 0)
1065 goto cantfind_ext2;
1066 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1067 le32_to_cpu(es->s_first_data_block) - 1)
1068 / EXT2_BLOCKS_PER_GROUP(sb)) + 1;
1069 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
1070 EXT2_DESC_PER_BLOCK(sb);
1071 sbi->s_group_desc = kmalloc_array(db_count,
1072 sizeof(struct buffer_head *),
1073 GFP_KERNEL);
1074 if (sbi->s_group_desc == NULL) {
1075 ret = -ENOMEM;
1076 ext2_msg(sb, KERN_ERR, "error: not enough memory");
1077 goto failed_mount;
1078 }
1079 bgl_lock_init(sbi->s_blockgroup_lock);
1080 sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL);
1081 if (!sbi->s_debts) {
1082 ret = -ENOMEM;
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 ret = err;
1132 ext2_msg(sb, KERN_ERR, "error: insufficient memory");
1133 goto failed_mount3;
1134 }
1135
1136#ifdef CONFIG_EXT2_FS_XATTR
1137 sbi->s_ea_block_cache = ext2_xattr_create_cache();
1138 if (!sbi->s_ea_block_cache) {
1139 ret = -ENOMEM;
1140 ext2_msg(sb, KERN_ERR, "Failed to create ea_block_cache");
1141 goto failed_mount3;
1142 }
1143#endif
1144
1145
1146
1147 sb->s_op = &ext2_sops;
1148 sb->s_export_op = &ext2_export_ops;
1149 sb->s_xattr = ext2_xattr_handlers;
1150
1151#ifdef CONFIG_QUOTA
1152 sb->dq_op = &dquot_operations;
1153 sb->s_qcop = &ext2_quotactl_ops;
1154 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1155#endif
1156
1157 root = ext2_iget(sb, EXT2_ROOT_INO);
1158 if (IS_ERR(root)) {
1159 ret = PTR_ERR(root);
1160 goto failed_mount3;
1161 }
1162 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1163 iput(root);
1164 ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
1165 goto failed_mount3;
1166 }
1167
1168 sb->s_root = d_make_root(root);
1169 if (!sb->s_root) {
1170 ext2_msg(sb, KERN_ERR, "error: get root inode failed");
1171 ret = -ENOMEM;
1172 goto failed_mount3;
1173 }
1174 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL))
1175 ext2_msg(sb, KERN_WARNING,
1176 "warning: mounting ext3 filesystem as ext2");
1177 if (ext2_setup_super (sb, es, sb_rdonly(sb)))
1178 sb->s_flags |= SB_RDONLY;
1179 ext2_write_super(sb);
1180 return 0;
1181
1182cantfind_ext2:
1183 if (!silent)
1184 ext2_msg(sb, KERN_ERR,
1185 "error: can't find an ext2 filesystem on dev %s.",
1186 sb->s_id);
1187 goto failed_mount;
1188failed_mount3:
1189 ext2_xattr_destroy_cache(sbi->s_ea_block_cache);
1190 percpu_counter_destroy(&sbi->s_freeblocks_counter);
1191 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1192 percpu_counter_destroy(&sbi->s_dirs_counter);
1193failed_mount2:
1194 for (i = 0; i < db_count; i++)
1195 brelse(sbi->s_group_desc[i]);
1196failed_mount_group_desc:
1197 kfree(sbi->s_group_desc);
1198 kfree(sbi->s_debts);
1199failed_mount:
1200 brelse(bh);
1201failed_sbi:
1202 sb->s_fs_info = NULL;
1203 kfree(sbi->s_blockgroup_lock);
1204 kfree(sbi);
1205failed:
1206 fs_put_dax(dax_dev);
1207 return ret;
1208}
1209
1210static void ext2_clear_super_error(struct super_block *sb)
1211{
1212 struct buffer_head *sbh = EXT2_SB(sb)->s_sbh;
1213
1214 if (buffer_write_io_error(sbh)) {
1215
1216
1217
1218
1219
1220
1221
1222
1223 ext2_msg(sb, KERN_ERR,
1224 "previous I/O error to superblock detected");
1225 clear_buffer_write_io_error(sbh);
1226 set_buffer_uptodate(sbh);
1227 }
1228}
1229
1230void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es,
1231 int wait)
1232{
1233 ext2_clear_super_error(sb);
1234 spin_lock(&EXT2_SB(sb)->s_lock);
1235 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb));
1236 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb));
1237 es->s_wtime = cpu_to_le32(ktime_get_real_seconds());
1238
1239 spin_unlock(&EXT2_SB(sb)->s_lock);
1240 mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
1241 if (wait)
1242 sync_dirty_buffer(EXT2_SB(sb)->s_sbh);
1243}
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255static int ext2_sync_fs(struct super_block *sb, int wait)
1256{
1257 struct ext2_sb_info *sbi = EXT2_SB(sb);
1258 struct ext2_super_block *es = EXT2_SB(sb)->s_es;
1259
1260
1261
1262
1263
1264 dquot_writeback_dquots(sb, -1);
1265
1266 spin_lock(&sbi->s_lock);
1267 if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) {
1268 ext2_debug("setting valid to 0\n");
1269 es->s_state &= cpu_to_le16(~EXT2_VALID_FS);
1270 }
1271 spin_unlock(&sbi->s_lock);
1272 ext2_sync_super(sb, es, wait);
1273 return 0;
1274}
1275
1276static int ext2_freeze(struct super_block *sb)
1277{
1278 struct ext2_sb_info *sbi = EXT2_SB(sb);
1279
1280
1281
1282
1283
1284
1285 if (atomic_long_read(&sb->s_remove_count)) {
1286 ext2_sync_fs(sb, 1);
1287 return 0;
1288 }
1289
1290 spin_lock(&sbi->s_lock);
1291 sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state);
1292 spin_unlock(&sbi->s_lock);
1293 ext2_sync_super(sb, sbi->s_es, 1);
1294
1295 return 0;
1296}
1297
1298static int ext2_unfreeze(struct super_block *sb)
1299{
1300
1301 ext2_write_super(sb);
1302
1303 return 0;
1304}
1305
1306static void ext2_write_super(struct super_block *sb)
1307{
1308 if (!sb_rdonly(sb))
1309 ext2_sync_fs(sb, 1);
1310}
1311
1312static int ext2_remount (struct super_block * sb, int * flags, char * data)
1313{
1314 struct ext2_sb_info * sbi = EXT2_SB(sb);
1315 struct ext2_super_block * es;
1316 struct ext2_mount_options new_opts;
1317 int err;
1318
1319 sync_filesystem(sb);
1320
1321 spin_lock(&sbi->s_lock);
1322 new_opts.s_mount_opt = sbi->s_mount_opt;
1323 new_opts.s_resuid = sbi->s_resuid;
1324 new_opts.s_resgid = sbi->s_resgid;
1325 spin_unlock(&sbi->s_lock);
1326
1327 if (!parse_options(data, sb, &new_opts))
1328 return -EINVAL;
1329
1330 spin_lock(&sbi->s_lock);
1331 es = sbi->s_es;
1332 if ((sbi->s_mount_opt ^ new_opts.s_mount_opt) & EXT2_MOUNT_DAX) {
1333 ext2_msg(sb, KERN_WARNING, "warning: refusing change of "
1334 "dax flag with busy inodes while remounting");
1335 new_opts.s_mount_opt ^= EXT2_MOUNT_DAX;
1336 }
1337 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
1338 goto out_set;
1339 if (*flags & SB_RDONLY) {
1340 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS ||
1341 !(sbi->s_mount_state & EXT2_VALID_FS))
1342 goto out_set;
1343
1344
1345
1346
1347
1348 es->s_state = cpu_to_le16(sbi->s_mount_state);
1349 es->s_mtime = cpu_to_le32(ktime_get_real_seconds());
1350 spin_unlock(&sbi->s_lock);
1351
1352 err = dquot_suspend(sb, -1);
1353 if (err < 0)
1354 return err;
1355
1356 ext2_sync_super(sb, es, 1);
1357 } else {
1358 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb,
1359 ~EXT2_FEATURE_RO_COMPAT_SUPP);
1360 if (ret) {
1361 spin_unlock(&sbi->s_lock);
1362 ext2_msg(sb, KERN_WARNING,
1363 "warning: couldn't remount RDWR because of "
1364 "unsupported optional features (%x).",
1365 le32_to_cpu(ret));
1366 return -EROFS;
1367 }
1368
1369
1370
1371
1372
1373 sbi->s_mount_state = le16_to_cpu(es->s_state);
1374 if (!ext2_setup_super (sb, es, 0))
1375 sb->s_flags &= ~SB_RDONLY;
1376 spin_unlock(&sbi->s_lock);
1377
1378 ext2_write_super(sb);
1379
1380 dquot_resume(sb, -1);
1381 }
1382
1383 spin_lock(&sbi->s_lock);
1384out_set:
1385 sbi->s_mount_opt = new_opts.s_mount_opt;
1386 sbi->s_resuid = new_opts.s_resuid;
1387 sbi->s_resgid = new_opts.s_resgid;
1388 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
1389 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
1390 spin_unlock(&sbi->s_lock);
1391
1392 return 0;
1393}
1394
1395static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf)
1396{
1397 struct super_block *sb = dentry->d_sb;
1398 struct ext2_sb_info *sbi = EXT2_SB(sb);
1399 struct ext2_super_block *es = sbi->s_es;
1400
1401 spin_lock(&sbi->s_lock);
1402
1403 if (test_opt (sb, MINIX_DF))
1404 sbi->s_overhead_last = 0;
1405 else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
1406 unsigned long i, overhead = 0;
1407 smp_rmb();
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419 overhead = le32_to_cpu(es->s_first_data_block);
1420
1421
1422
1423
1424
1425
1426 for (i = 0; i < sbi->s_groups_count; i++)
1427 overhead += ext2_bg_has_super(sb, i) +
1428 ext2_bg_num_gdb(sb, i);
1429
1430
1431
1432
1433
1434 overhead += (sbi->s_groups_count *
1435 (2 + sbi->s_itb_per_group));
1436 sbi->s_overhead_last = overhead;
1437 smp_wmb();
1438 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
1439 }
1440
1441 buf->f_type = EXT2_SUPER_MAGIC;
1442 buf->f_bsize = sb->s_blocksize;
1443 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
1444 buf->f_bfree = ext2_count_free_blocks(sb);
1445 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
1446 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
1447 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
1448 buf->f_bavail = 0;
1449 buf->f_files = le32_to_cpu(es->s_inodes_count);
1450 buf->f_ffree = ext2_count_free_inodes(sb);
1451 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
1452 buf->f_namelen = EXT2_NAME_LEN;
1453 buf->f_fsid = uuid_to_fsid(es->s_uuid);
1454 spin_unlock(&sbi->s_lock);
1455 return 0;
1456}
1457
1458static struct dentry *ext2_mount(struct file_system_type *fs_type,
1459 int flags, const char *dev_name, void *data)
1460{
1461 return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super);
1462}
1463
1464#ifdef CONFIG_QUOTA
1465
1466
1467
1468
1469
1470static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data,
1471 size_t len, loff_t off)
1472{
1473 struct inode *inode = sb_dqopt(sb)->files[type];
1474 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1475 int err = 0;
1476 int offset = off & (sb->s_blocksize - 1);
1477 int tocopy;
1478 size_t toread;
1479 struct buffer_head tmp_bh;
1480 struct buffer_head *bh;
1481 loff_t i_size = i_size_read(inode);
1482
1483 if (off > i_size)
1484 return 0;
1485 if (off+len > i_size)
1486 len = i_size-off;
1487 toread = len;
1488 while (toread > 0) {
1489 tocopy = sb->s_blocksize - offset < toread ?
1490 sb->s_blocksize - offset : toread;
1491
1492 tmp_bh.b_state = 0;
1493 tmp_bh.b_size = sb->s_blocksize;
1494 err = ext2_get_block(inode, blk, &tmp_bh, 0);
1495 if (err < 0)
1496 return err;
1497 if (!buffer_mapped(&tmp_bh))
1498 memset(data, 0, tocopy);
1499 else {
1500 bh = sb_bread(sb, tmp_bh.b_blocknr);
1501 if (!bh)
1502 return -EIO;
1503 memcpy(data, bh->b_data+offset, tocopy);
1504 brelse(bh);
1505 }
1506 offset = 0;
1507 toread -= tocopy;
1508 data += tocopy;
1509 blk++;
1510 }
1511 return len;
1512}
1513
1514
1515static ssize_t ext2_quota_write(struct super_block *sb, int type,
1516 const char *data, size_t len, loff_t off)
1517{
1518 struct inode *inode = sb_dqopt(sb)->files[type];
1519 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1520 int err = 0;
1521 int offset = off & (sb->s_blocksize - 1);
1522 int tocopy;
1523 size_t towrite = len;
1524 struct buffer_head tmp_bh;
1525 struct buffer_head *bh;
1526
1527 while (towrite > 0) {
1528 tocopy = sb->s_blocksize - offset < towrite ?
1529 sb->s_blocksize - offset : towrite;
1530
1531 tmp_bh.b_state = 0;
1532 tmp_bh.b_size = sb->s_blocksize;
1533 err = ext2_get_block(inode, blk, &tmp_bh, 1);
1534 if (err < 0)
1535 goto out;
1536 if (offset || tocopy != EXT2_BLOCK_SIZE(sb))
1537 bh = sb_bread(sb, tmp_bh.b_blocknr);
1538 else
1539 bh = sb_getblk(sb, tmp_bh.b_blocknr);
1540 if (unlikely(!bh)) {
1541 err = -EIO;
1542 goto out;
1543 }
1544 lock_buffer(bh);
1545 memcpy(bh->b_data+offset, data, tocopy);
1546 flush_dcache_page(bh->b_page);
1547 set_buffer_uptodate(bh);
1548 mark_buffer_dirty(bh);
1549 unlock_buffer(bh);
1550 brelse(bh);
1551 offset = 0;
1552 towrite -= tocopy;
1553 data += tocopy;
1554 blk++;
1555 }
1556out:
1557 if (len == towrite)
1558 return err;
1559 if (inode->i_size < off+len-towrite)
1560 i_size_write(inode, off+len-towrite);
1561 inode_inc_iversion(inode);
1562 inode->i_mtime = inode->i_ctime = current_time(inode);
1563 mark_inode_dirty(inode);
1564 return len - towrite;
1565}
1566
1567static int ext2_quota_on(struct super_block *sb, int type, int format_id,
1568 const struct path *path)
1569{
1570 int err;
1571 struct inode *inode;
1572
1573 err = dquot_quota_on(sb, type, format_id, path);
1574 if (err)
1575 return err;
1576
1577 inode = d_inode(path->dentry);
1578 inode_lock(inode);
1579 EXT2_I(inode)->i_flags |= EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL;
1580 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
1581 S_NOATIME | S_IMMUTABLE);
1582 inode_unlock(inode);
1583 mark_inode_dirty(inode);
1584
1585 return 0;
1586}
1587
1588static int ext2_quota_off(struct super_block *sb, int type)
1589{
1590 struct inode *inode = sb_dqopt(sb)->files[type];
1591 int err;
1592
1593 if (!inode || !igrab(inode))
1594 goto out;
1595
1596 err = dquot_quota_off(sb, type);
1597 if (err)
1598 goto out_put;
1599
1600 inode_lock(inode);
1601 EXT2_I(inode)->i_flags &= ~(EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL);
1602 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
1603 inode_unlock(inode);
1604 mark_inode_dirty(inode);
1605out_put:
1606 iput(inode);
1607 return err;
1608out:
1609 return dquot_quota_off(sb, type);
1610}
1611
1612#endif
1613
1614static struct file_system_type ext2_fs_type = {
1615 .owner = THIS_MODULE,
1616 .name = "ext2",
1617 .mount = ext2_mount,
1618 .kill_sb = kill_block_super,
1619 .fs_flags = FS_REQUIRES_DEV,
1620};
1621MODULE_ALIAS_FS("ext2");
1622
1623static int __init init_ext2_fs(void)
1624{
1625 int err;
1626
1627 err = init_inodecache();
1628 if (err)
1629 return err;
1630 err = register_filesystem(&ext2_fs_type);
1631 if (err)
1632 goto out;
1633 return 0;
1634out:
1635 destroy_inodecache();
1636 return err;
1637}
1638
1639static void __exit exit_ext2_fs(void)
1640{
1641 unregister_filesystem(&ext2_fs_type);
1642 destroy_inodecache();
1643}
1644
1645MODULE_AUTHOR("Remy Card and others");
1646MODULE_DESCRIPTION("Second Extended Filesystem");
1647MODULE_LICENSE("GPL");
1648module_init(init_ext2_fs)
1649module_exit(exit_ext2_fs)
1650