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fs/ext2/super.c: Use printf extension %pV
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / ext2 / super.c
blob27822b98f74d2f9bee862586ed363a5ad1336a8a
1 /*
2 * linux/fs/ext2/super.c
3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19 #include <linux/module.h>
20 #include <linux/string.h>
21 #include <linux/fs.h>
22 #include <linux/slab.h>
23 #include <linux/init.h>
24 #include <linux/blkdev.h>
25 #include <linux/parser.h>
26 #include <linux/random.h>
27 #include <linux/buffer_head.h>
28 #include <linux/exportfs.h>
29 #include <linux/vfs.h>
30 #include <linux/seq_file.h>
31 #include <linux/mount.h>
32 #include <linux/log2.h>
33 #include <linux/quotaops.h>
34 #include <asm/uaccess.h>
35 #include "ext2.h"
36 #include "xattr.h"
37 #include "acl.h"
38 #include "xip.h"
39
40 static void ext2_sync_super(struct super_block *sb,
41 struct ext2_super_block *es, int wait);
42 static int ext2_remount (struct super_block * sb, int * flags, char * data);
43 static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf);
44 static int ext2_sync_fs(struct super_block *sb, int wait);
45
46 void ext2_error(struct super_block *sb, const char *function,
47 const char *fmt, ...)
48 {
49 struct va_format vaf;
50 va_list args;
51 struct ext2_sb_info *sbi = EXT2_SB(sb);
52 struct ext2_super_block *es = sbi->s_es;
53
54 if (!(sb->s_flags & MS_RDONLY)) {
55 spin_lock(&sbi->s_lock);
56 sbi->s_mount_state |= EXT2_ERROR_FS;
57 es->s_state |= cpu_to_le16(EXT2_ERROR_FS);
58 spin_unlock(&sbi->s_lock);
59 ext2_sync_super(sb, es, 1);
60 }
61
62 va_start(args, fmt);
63
64 vaf.fmt = fmt;
65 vaf.va = &args;
66
67 printk(KERN_CRIT "EXT2-fs (%s): error: %s: %pV\n",
68 sb->s_id, function, &vaf);
69
70 va_end(args);
71
72 if (test_opt(sb, ERRORS_PANIC))
73 panic("EXT2-fs: panic from previous error\n");
74 if (test_opt(sb, ERRORS_RO)) {
75 ext2_msg(sb, KERN_CRIT,
76 "error: remounting filesystem read-only");
77 sb->s_flags |= MS_RDONLY;
78 }
79 }
80
81 void ext2_msg(struct super_block *sb, const char *prefix,
82 const char *fmt, ...)
83 {
84 struct va_format vaf;
85 va_list args;
86
87 va_start(args, fmt);
88
89 vaf.fmt = fmt;
90 vaf.va = &args;
91
92 printk("%sEXT2-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
93
94 va_end(args);
95 }
96
97 /*
98 * This must be called with sbi->s_lock held.
99 */
100 void ext2_update_dynamic_rev(struct super_block *sb)
101 {
102 struct ext2_super_block *es = EXT2_SB(sb)->s_es;
103
104 if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV)
105 return;
106
107 ext2_msg(sb, KERN_WARNING,
108 "warning: updating to rev %d because of "
109 "new feature flag, running e2fsck is recommended",
110 EXT2_DYNAMIC_REV);
111
112 es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO);
113 es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE);
114 es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV);
115 /* leave es->s_feature_*compat flags alone */
116 /* es->s_uuid will be set by e2fsck if empty */
117
118 /*
119 * The rest of the superblock fields should be zero, and if not it
120 * means they are likely already in use, so leave them alone. We
121 * can leave it up to e2fsck to clean up any inconsistencies there.
122 */
123 }
124
125 static void ext2_put_super (struct super_block * sb)
126 {
127 int db_count;
128 int i;
129 struct ext2_sb_info *sbi = EXT2_SB(sb);
130
131 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
132
133 if (sb->s_dirt)
134 ext2_write_super(sb);
135
136 ext2_xattr_put_super(sb);
137 if (!(sb->s_flags & MS_RDONLY)) {
138 struct ext2_super_block *es = sbi->s_es;
139
140 spin_lock(&sbi->s_lock);
141 es->s_state = cpu_to_le16(sbi->s_mount_state);
142 spin_unlock(&sbi->s_lock);
143 ext2_sync_super(sb, es, 1);
144 }
145 db_count = sbi->s_gdb_count;
146 for (i = 0; i < db_count; i++)
147 if (sbi->s_group_desc[i])
148 brelse (sbi->s_group_desc[i]);
149 kfree(sbi->s_group_desc);
150 kfree(sbi->s_debts);
151 percpu_counter_destroy(&sbi->s_freeblocks_counter);
152 percpu_counter_destroy(&sbi->s_freeinodes_counter);
153 percpu_counter_destroy(&sbi->s_dirs_counter);
154 brelse (sbi->s_sbh);
155 sb->s_fs_info = NULL;
156 kfree(sbi->s_blockgroup_lock);
157 kfree(sbi);
158 }
159
160 static struct kmem_cache * ext2_inode_cachep;
161
162 static struct inode *ext2_alloc_inode(struct super_block *sb)
163 {
164 struct ext2_inode_info *ei;
165 ei = (struct ext2_inode_info *)kmem_cache_alloc(ext2_inode_cachep, GFP_KERNEL);
166 if (!ei)
167 return NULL;
168 ei->i_block_alloc_info = NULL;
169 ei->vfs_inode.i_version = 1;
170 return &ei->vfs_inode;
171 }
172
173 static void ext2_destroy_inode(struct inode *inode)
174 {
175 kmem_cache_free(ext2_inode_cachep, EXT2_I(inode));
176 }
177
178 static void init_once(void *foo)
179 {
180 struct ext2_inode_info *ei = (struct ext2_inode_info *) foo;
181
182 rwlock_init(&ei->i_meta_lock);
183 #ifdef CONFIG_EXT2_FS_XATTR
184 init_rwsem(&ei->xattr_sem);
185 #endif
186 mutex_init(&ei->truncate_mutex);
187 inode_init_once(&ei->vfs_inode);
188 }
189
190 static int init_inodecache(void)
191 {
192 ext2_inode_cachep = kmem_cache_create("ext2_inode_cache",
193 sizeof(struct ext2_inode_info),
194 0, (SLAB_RECLAIM_ACCOUNT|
195 SLAB_MEM_SPREAD),
196 init_once);
197 if (ext2_inode_cachep == NULL)
198 return -ENOMEM;
199 return 0;
200 }
201
202 static void destroy_inodecache(void)
203 {
204 kmem_cache_destroy(ext2_inode_cachep);
205 }
206
207 static int ext2_show_options(struct seq_file *seq, struct vfsmount *vfs)
208 {
209 struct super_block *sb = vfs->mnt_sb;
210 struct ext2_sb_info *sbi = EXT2_SB(sb);
211 struct ext2_super_block *es = sbi->s_es;
212 unsigned long def_mount_opts;
213
214 spin_lock(&sbi->s_lock);
215 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
216
217 if (sbi->s_sb_block != 1)
218 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
219 if (test_opt(sb, MINIX_DF))
220 seq_puts(seq, ",minixdf");
221 if (test_opt(sb, GRPID))
222 seq_puts(seq, ",grpid");
223 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS))
224 seq_puts(seq, ",nogrpid");
225 if (sbi->s_resuid != EXT2_DEF_RESUID ||
226 le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) {
227 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
228 }
229 if (sbi->s_resgid != EXT2_DEF_RESGID ||
230 le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) {
231 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
232 }
233 if (test_opt(sb, ERRORS_RO)) {
234 int def_errors = le16_to_cpu(es->s_errors);
235
236 if (def_errors == EXT2_ERRORS_PANIC ||
237 def_errors == EXT2_ERRORS_CONTINUE) {
238 seq_puts(seq, ",errors=remount-ro");
239 }
240 }
241 if (test_opt(sb, ERRORS_CONT))
242 seq_puts(seq, ",errors=continue");
243 if (test_opt(sb, ERRORS_PANIC))
244 seq_puts(seq, ",errors=panic");
245 if (test_opt(sb, NO_UID32))
246 seq_puts(seq, ",nouid32");
247 if (test_opt(sb, DEBUG))
248 seq_puts(seq, ",debug");
249 if (test_opt(sb, OLDALLOC))
250 seq_puts(seq, ",oldalloc");
251
252 #ifdef CONFIG_EXT2_FS_XATTR
253 if (test_opt(sb, XATTR_USER))
254 seq_puts(seq, ",user_xattr");
255 if (!test_opt(sb, XATTR_USER) &&
256 (def_mount_opts & EXT2_DEFM_XATTR_USER)) {
257 seq_puts(seq, ",nouser_xattr");
258 }
259 #endif
260
261 #ifdef CONFIG_EXT2_FS_POSIX_ACL
262 if (test_opt(sb, POSIX_ACL))
263 seq_puts(seq, ",acl");
264 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL))
265 seq_puts(seq, ",noacl");
266 #endif
267
268 if (test_opt(sb, NOBH))
269 seq_puts(seq, ",nobh");
270
271 #if defined(CONFIG_QUOTA)
272 if (sbi->s_mount_opt & EXT2_MOUNT_USRQUOTA)
273 seq_puts(seq, ",usrquota");
274
275 if (sbi->s_mount_opt & EXT2_MOUNT_GRPQUOTA)
276 seq_puts(seq, ",grpquota");
277 #endif
278
279 #if defined(CONFIG_EXT2_FS_XIP)
280 if (sbi->s_mount_opt & EXT2_MOUNT_XIP)
281 seq_puts(seq, ",xip");
282 #endif
283
284 if (!test_opt(sb, RESERVATION))
285 seq_puts(seq, ",noreservation");
286
287 spin_unlock(&sbi->s_lock);
288 return 0;
289 }
290
291 #ifdef CONFIG_QUOTA
292 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off);
293 static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off);
294 #endif
295
296 static const struct super_operations ext2_sops = {
297 .alloc_inode = ext2_alloc_inode,
298 .destroy_inode = ext2_destroy_inode,
299 .write_inode = ext2_write_inode,
300 .evict_inode = ext2_evict_inode,
301 .put_super = ext2_put_super,
302 .write_super = ext2_write_super,
303 .sync_fs = ext2_sync_fs,
304 .statfs = ext2_statfs,
305 .remount_fs = ext2_remount,
306 .show_options = ext2_show_options,
307 #ifdef CONFIG_QUOTA
308 .quota_read = ext2_quota_read,
309 .quota_write = ext2_quota_write,
310 #endif
311 };
312
313 static struct inode *ext2_nfs_get_inode(struct super_block *sb,
314 u64 ino, u32 generation)
315 {
316 struct inode *inode;
317
318 if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO)
319 return ERR_PTR(-ESTALE);
320 if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count))
321 return ERR_PTR(-ESTALE);
322
323 /* iget isn't really right if the inode is currently unallocated!!
324 * ext2_read_inode currently does appropriate checks, but
325 * it might be "neater" to call ext2_get_inode first and check
326 * if the inode is valid.....
327 */
328 inode = ext2_iget(sb, ino);
329 if (IS_ERR(inode))
330 return ERR_CAST(inode);
331 if (generation && inode->i_generation != generation) {
332 /* we didn't find the right inode.. */
333 iput(inode);
334 return ERR_PTR(-ESTALE);
335 }
336 return inode;
337 }
338
339 static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid,
340 int fh_len, int fh_type)
341 {
342 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
343 ext2_nfs_get_inode);
344 }
345
346 static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid,
347 int fh_len, int fh_type)
348 {
349 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
350 ext2_nfs_get_inode);
351 }
352
353 /* Yes, most of these are left as NULL!!
354 * A NULL value implies the default, which works with ext2-like file
355 * systems, but can be improved upon.
356 * Currently only get_parent is required.
357 */
358 static const struct export_operations ext2_export_ops = {
359 .fh_to_dentry = ext2_fh_to_dentry,
360 .fh_to_parent = ext2_fh_to_parent,
361 .get_parent = ext2_get_parent,
362 };
363
364 static unsigned long get_sb_block(void **data)
365 {
366 unsigned long sb_block;
367 char *options = (char *) *data;
368
369 if (!options || strncmp(options, "sb=", 3) != 0)
370 return 1; /* Default location */
371 options += 3;
372 sb_block = simple_strtoul(options, &options, 0);
373 if (*options && *options != ',') {
374 printk("EXT2-fs: Invalid sb specification: %s\n",
375 (char *) *data);
376 return 1;
377 }
378 if (*options == ',')
379 options++;
380 *data = (void *) options;
381 return sb_block;
382 }
383
384 enum {
385 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
386 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic,
387 Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug,
388 Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr,
389 Opt_acl, Opt_noacl, Opt_xip, Opt_ignore, Opt_err, Opt_quota,
390 Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation
391 };
392
393 static const match_table_t tokens = {
394 {Opt_bsd_df, "bsddf"},
395 {Opt_minix_df, "minixdf"},
396 {Opt_grpid, "grpid"},
397 {Opt_grpid, "bsdgroups"},
398 {Opt_nogrpid, "nogrpid"},
399 {Opt_nogrpid, "sysvgroups"},
400 {Opt_resgid, "resgid=%u"},
401 {Opt_resuid, "resuid=%u"},
402 {Opt_sb, "sb=%u"},
403 {Opt_err_cont, "errors=continue"},
404 {Opt_err_panic, "errors=panic"},
405 {Opt_err_ro, "errors=remount-ro"},
406 {Opt_nouid32, "nouid32"},
407 {Opt_nocheck, "check=none"},
408 {Opt_nocheck, "nocheck"},
409 {Opt_debug, "debug"},
410 {Opt_oldalloc, "oldalloc"},
411 {Opt_orlov, "orlov"},
412 {Opt_nobh, "nobh"},
413 {Opt_user_xattr, "user_xattr"},
414 {Opt_nouser_xattr, "nouser_xattr"},
415 {Opt_acl, "acl"},
416 {Opt_noacl, "noacl"},
417 {Opt_xip, "xip"},
418 {Opt_grpquota, "grpquota"},
419 {Opt_ignore, "noquota"},
420 {Opt_quota, "quota"},
421 {Opt_usrquota, "usrquota"},
422 {Opt_reservation, "reservation"},
423 {Opt_noreservation, "noreservation"},
424 {Opt_err, NULL}
425 };
426
427 static int parse_options(char *options, struct super_block *sb)
428 {
429 char *p;
430 struct ext2_sb_info *sbi = EXT2_SB(sb);
431 substring_t args[MAX_OPT_ARGS];
432 int option;
433
434 if (!options)
435 return 1;
436
437 while ((p = strsep (&options, ",")) != NULL) {
438 int token;
439 if (!*p)
440 continue;
441
442 token = match_token(p, tokens, args);
443 switch (token) {
444 case Opt_bsd_df:
445 clear_opt (sbi->s_mount_opt, MINIX_DF);
446 break;
447 case Opt_minix_df:
448 set_opt (sbi->s_mount_opt, MINIX_DF);
449 break;
450 case Opt_grpid:
451 set_opt (sbi->s_mount_opt, GRPID);
452 break;
453 case Opt_nogrpid:
454 clear_opt (sbi->s_mount_opt, GRPID);
455 break;
456 case Opt_resuid:
457 if (match_int(&args[0], &option))
458 return 0;
459 sbi->s_resuid = option;
460 break;
461 case Opt_resgid:
462 if (match_int(&args[0], &option))
463 return 0;
464 sbi->s_resgid = option;
465 break;
466 case Opt_sb:
467 /* handled by get_sb_block() instead of here */
468 /* *sb_block = match_int(&args[0]); */
469 break;
470 case Opt_err_panic:
471 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
472 clear_opt (sbi->s_mount_opt, ERRORS_RO);
473 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
474 break;
475 case Opt_err_ro:
476 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
477 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
478 set_opt (sbi->s_mount_opt, ERRORS_RO);
479 break;
480 case Opt_err_cont:
481 clear_opt (sbi->s_mount_opt, ERRORS_RO);
482 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
483 set_opt (sbi->s_mount_opt, ERRORS_CONT);
484 break;
485 case Opt_nouid32:
486 set_opt (sbi->s_mount_opt, NO_UID32);
487 break;
488 case Opt_nocheck:
489 clear_opt (sbi->s_mount_opt, CHECK);
490 break;
491 case Opt_debug:
492 set_opt (sbi->s_mount_opt, DEBUG);
493 break;
494 case Opt_oldalloc:
495 set_opt (sbi->s_mount_opt, OLDALLOC);
496 break;
497 case Opt_orlov:
498 clear_opt (sbi->s_mount_opt, OLDALLOC);
499 break;
500 case Opt_nobh:
501 set_opt (sbi->s_mount_opt, NOBH);
502 break;
503 #ifdef CONFIG_EXT2_FS_XATTR
504 case Opt_user_xattr:
505 set_opt (sbi->s_mount_opt, XATTR_USER);
506 break;
507 case Opt_nouser_xattr:
508 clear_opt (sbi->s_mount_opt, XATTR_USER);
509 break;
510 #else
511 case Opt_user_xattr:
512 case Opt_nouser_xattr:
513 ext2_msg(sb, KERN_INFO, "(no)user_xattr options"
514 "not supported");
515 break;
516 #endif
517 #ifdef CONFIG_EXT2_FS_POSIX_ACL
518 case Opt_acl:
519 set_opt(sbi->s_mount_opt, POSIX_ACL);
520 break;
521 case Opt_noacl:
522 clear_opt(sbi->s_mount_opt, POSIX_ACL);
523 break;
524 #else
525 case Opt_acl:
526 case Opt_noacl:
527 ext2_msg(sb, KERN_INFO,
528 "(no)acl options not supported");
529 break;
530 #endif
531 case Opt_xip:
532 #ifdef CONFIG_EXT2_FS_XIP
533 set_opt (sbi->s_mount_opt, XIP);
534 #else
535 ext2_msg(sb, KERN_INFO, "xip option not supported");
536 #endif
537 break;
538
539 #if defined(CONFIG_QUOTA)
540 case Opt_quota:
541 case Opt_usrquota:
542 set_opt(sbi->s_mount_opt, USRQUOTA);
543 break;
544
545 case Opt_grpquota:
546 set_opt(sbi->s_mount_opt, GRPQUOTA);
547 break;
548 #else
549 case Opt_quota:
550 case Opt_usrquota:
551 case Opt_grpquota:
552 ext2_msg(sb, KERN_INFO,
553 "quota operations not supported");
554 break;
555 #endif
556
557 case Opt_reservation:
558 set_opt(sbi->s_mount_opt, RESERVATION);
559 ext2_msg(sb, KERN_INFO, "reservations ON");
560 break;
561 case Opt_noreservation:
562 clear_opt(sbi->s_mount_opt, RESERVATION);
563 ext2_msg(sb, KERN_INFO, "reservations OFF");
564 break;
565 case Opt_ignore:
566 break;
567 default:
568 return 0;
569 }
570 }
571 return 1;
572 }
573
574 static int ext2_setup_super (struct super_block * sb,
575 struct ext2_super_block * es,
576 int read_only)
577 {
578 int res = 0;
579 struct ext2_sb_info *sbi = EXT2_SB(sb);
580
581 if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) {
582 ext2_msg(sb, KERN_ERR,
583 "error: revision level too high, "
584 "forcing read-only mode");
585 res = MS_RDONLY;
586 }
587 if (read_only)
588 return res;
589 if (!(sbi->s_mount_state & EXT2_VALID_FS))
590 ext2_msg(sb, KERN_WARNING,
591 "warning: mounting unchecked fs, "
592 "running e2fsck is recommended");
593 else if ((sbi->s_mount_state & EXT2_ERROR_FS))
594 ext2_msg(sb, KERN_WARNING,
595 "warning: mounting fs with errors, "
596 "running e2fsck is recommended");
597 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
598 le16_to_cpu(es->s_mnt_count) >=
599 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
600 ext2_msg(sb, KERN_WARNING,
601 "warning: maximal mount count reached, "
602 "running e2fsck is recommended");
603 else if (le32_to_cpu(es->s_checkinterval) &&
604 (le32_to_cpu(es->s_lastcheck) +
605 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
606 ext2_msg(sb, KERN_WARNING,
607 "warning: checktime reached, "
608 "running e2fsck is recommended");
609 if (!le16_to_cpu(es->s_max_mnt_count))
610 es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT);
611 le16_add_cpu(&es->s_mnt_count, 1);
612 if (test_opt (sb, DEBUG))
613 ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, fs=%lu, gc=%lu, "
614 "bpg=%lu, ipg=%lu, mo=%04lx]",
615 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize,
616 sbi->s_frag_size,
617 sbi->s_groups_count,
618 EXT2_BLOCKS_PER_GROUP(sb),
619 EXT2_INODES_PER_GROUP(sb),
620 sbi->s_mount_opt);
621 return res;
622 }
623
624 static int ext2_check_descriptors(struct super_block *sb)
625 {
626 int i;
627 struct ext2_sb_info *sbi = EXT2_SB(sb);
628
629 ext2_debug ("Checking group descriptors");
630
631 for (i = 0; i < sbi->s_groups_count; i++) {
632 struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL);
633 ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i);
634 ext2_fsblk_t last_block;
635
636 if (i == sbi->s_groups_count - 1)
637 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
638 else
639 last_block = first_block +
640 (EXT2_BLOCKS_PER_GROUP(sb) - 1);
641
642 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
643 le32_to_cpu(gdp->bg_block_bitmap) > last_block)
644 {
645 ext2_error (sb, "ext2_check_descriptors",
646 "Block bitmap for group %d"
647 " not in group (block %lu)!",
648 i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap));
649 return 0;
650 }
651 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
652 le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
653 {
654 ext2_error (sb, "ext2_check_descriptors",
655 "Inode bitmap for group %d"
656 " not in group (block %lu)!",
657 i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap));
658 return 0;
659 }
660 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
661 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
662 last_block)
663 {
664 ext2_error (sb, "ext2_check_descriptors",
665 "Inode table for group %d"
666 " not in group (block %lu)!",
667 i, (unsigned long) le32_to_cpu(gdp->bg_inode_table));
668 return 0;
669 }
670 }
671 return 1;
672 }
673
674 /*
675 * Maximal file size. There is a direct, and {,double-,triple-}indirect
676 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
677 * We need to be 1 filesystem block less than the 2^32 sector limit.
678 */
679 static loff_t ext2_max_size(int bits)
680 {
681 loff_t res = EXT2_NDIR_BLOCKS;
682 int meta_blocks;
683 loff_t upper_limit;
684
685 /* This is calculated to be the largest file size for a
686 * dense, file such that the total number of
687 * sectors in the file, including data and all indirect blocks,
688 * does not exceed 2^32 -1
689 * __u32 i_blocks representing the total number of
690 * 512 bytes blocks of the file
691 */
692 upper_limit = (1LL << 32) - 1;
693
694 /* total blocks in file system block size */
695 upper_limit >>= (bits - 9);
696
697
698 /* indirect blocks */
699 meta_blocks = 1;
700 /* double indirect blocks */
701 meta_blocks += 1 + (1LL << (bits-2));
702 /* tripple indirect blocks */
703 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
704
705 upper_limit -= meta_blocks;
706 upper_limit <<= bits;
707
708 res += 1LL << (bits-2);
709 res += 1LL << (2*(bits-2));
710 res += 1LL << (3*(bits-2));
711 res <<= bits;
712 if (res > upper_limit)
713 res = upper_limit;
714
715 if (res > MAX_LFS_FILESIZE)
716 res = MAX_LFS_FILESIZE;
717
718 return res;
719 }
720
721 static unsigned long descriptor_loc(struct super_block *sb,
722 unsigned long logic_sb_block,
723 int nr)
724 {
725 struct ext2_sb_info *sbi = EXT2_SB(sb);
726 unsigned long bg, first_meta_bg;
727 int has_super = 0;
728
729 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
730
731 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) ||
732 nr < first_meta_bg)
733 return (logic_sb_block + nr + 1);
734 bg = sbi->s_desc_per_block * nr;
735 if (ext2_bg_has_super(sb, bg))
736 has_super = 1;
737
738 return ext2_group_first_block_no(sb, bg) + has_super;
739 }
740
741 static int ext2_fill_super(struct super_block *sb, void *data, int silent)
742 {
743 struct buffer_head * bh;
744 struct ext2_sb_info * sbi;
745 struct ext2_super_block * es;
746 struct inode *root;
747 unsigned long block;
748 unsigned long sb_block = get_sb_block(&data);
749 unsigned long logic_sb_block;
750 unsigned long offset = 0;
751 unsigned long def_mount_opts;
752 long ret = -EINVAL;
753 int blocksize = BLOCK_SIZE;
754 int db_count;
755 int i, j;
756 __le32 features;
757 int err;
758
759 err = -ENOMEM;
760 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
761 if (!sbi)
762 goto failed_unlock;
763
764 sbi->s_blockgroup_lock =
765 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
766 if (!sbi->s_blockgroup_lock) {
767 kfree(sbi);
768 goto failed_unlock;
769 }
770 sb->s_fs_info = sbi;
771 sbi->s_sb_block = sb_block;
772
773 spin_lock_init(&sbi->s_lock);
774
775 /*
776 * See what the current blocksize for the device is, and
777 * use that as the blocksize. Otherwise (or if the blocksize
778 * is smaller than the default) use the default.
779 * This is important for devices that have a hardware
780 * sectorsize that is larger than the default.
781 */
782 blocksize = sb_min_blocksize(sb, BLOCK_SIZE);
783 if (!blocksize) {
784 ext2_msg(sb, KERN_ERR, "error: unable to set blocksize");
785 goto failed_sbi;
786 }
787
788 /*
789 * If the superblock doesn't start on a hardware sector boundary,
790 * calculate the offset.
791 */
792 if (blocksize != BLOCK_SIZE) {
793 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
794 offset = (sb_block*BLOCK_SIZE) % blocksize;
795 } else {
796 logic_sb_block = sb_block;
797 }
798
799 if (!(bh = sb_bread(sb, logic_sb_block))) {
800 ext2_msg(sb, KERN_ERR, "error: unable to read superblock");
801 goto failed_sbi;
802 }
803 /*
804 * Note: s_es must be initialized as soon as possible because
805 * some ext2 macro-instructions depend on its value
806 */
807 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
808 sbi->s_es = es;
809 sb->s_magic = le16_to_cpu(es->s_magic);
810
811 if (sb->s_magic != EXT2_SUPER_MAGIC)
812 goto cantfind_ext2;
813
814 /* Set defaults before we parse the mount options */
815 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
816 if (def_mount_opts & EXT2_DEFM_DEBUG)
817 set_opt(sbi->s_mount_opt, DEBUG);
818 if (def_mount_opts & EXT2_DEFM_BSDGROUPS)
819 set_opt(sbi->s_mount_opt, GRPID);
820 if (def_mount_opts & EXT2_DEFM_UID16)
821 set_opt(sbi->s_mount_opt, NO_UID32);
822 #ifdef CONFIG_EXT2_FS_XATTR
823 if (def_mount_opts & EXT2_DEFM_XATTR_USER)
824 set_opt(sbi->s_mount_opt, XATTR_USER);
825 #endif
826 #ifdef CONFIG_EXT2_FS_POSIX_ACL
827 if (def_mount_opts & EXT2_DEFM_ACL)
828 set_opt(sbi->s_mount_opt, POSIX_ACL);
829 #endif
830
831 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
832 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
833 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE)
834 set_opt(sbi->s_mount_opt, ERRORS_CONT);
835 else
836 set_opt(sbi->s_mount_opt, ERRORS_RO);
837
838 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
839 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
840
841 set_opt(sbi->s_mount_opt, RESERVATION);
842
843 if (!parse_options((char *) data, sb))
844 goto failed_mount;
845
846 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
847 ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ?
848 MS_POSIXACL : 0);
849
850 ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset
851 EXT2_MOUNT_XIP if not */
852
853 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV &&
854 (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) ||
855 EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
856 EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U)))
857 ext2_msg(sb, KERN_WARNING,
858 "warning: feature flags set on rev 0 fs, "
859 "running e2fsck is recommended");
860 /*
861 * Check feature flags regardless of the revision level, since we
862 * previously didn't change the revision level when setting the flags,
863 * so there is a chance incompat flags are set on a rev 0 filesystem.
864 */
865 features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP);
866 if (features) {
867 ext2_msg(sb, KERN_ERR, "error: couldn't mount because of "
868 "unsupported optional features (%x)",
869 le32_to_cpu(features));
870 goto failed_mount;
871 }
872 if (!(sb->s_flags & MS_RDONLY) &&
873 (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){
874 ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of "
875 "unsupported optional features (%x)",
876 le32_to_cpu(features));
877 goto failed_mount;
878 }
879
880 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
881
882 if (ext2_use_xip(sb) && blocksize != PAGE_SIZE) {
883 if (!silent)
884 ext2_msg(sb, KERN_ERR,
885 "error: unsupported blocksize for xip");
886 goto failed_mount;
887 }
888
889 /* If the blocksize doesn't match, re-read the thing.. */
890 if (sb->s_blocksize != blocksize) {
891 brelse(bh);
892
893 if (!sb_set_blocksize(sb, blocksize)) {
894 ext2_msg(sb, KERN_ERR, "error: blocksize is too small");
895 goto failed_sbi;
896 }
897
898 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
899 offset = (sb_block*BLOCK_SIZE) % blocksize;
900 bh = sb_bread(sb, logic_sb_block);
901 if(!bh) {
902 ext2_msg(sb, KERN_ERR, "error: couldn't read"
903 "superblock on 2nd try");
904 goto failed_sbi;
905 }
906 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
907 sbi->s_es = es;
908 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) {
909 ext2_msg(sb, KERN_ERR, "error: magic mismatch");
910 goto failed_mount;
911 }
912 }
913
914 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits);
915
916 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) {
917 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
918 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
919 } else {
920 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
921 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
922 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) ||
923 !is_power_of_2(sbi->s_inode_size) ||
924 (sbi->s_inode_size > blocksize)) {
925 ext2_msg(sb, KERN_ERR,
926 "error: unsupported inode size: %d",
927 sbi->s_inode_size);
928 goto failed_mount;
929 }
930 }
931
932 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE <<
933 le32_to_cpu(es->s_log_frag_size);
934 if (sbi->s_frag_size == 0)
935 goto cantfind_ext2;
936 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size;
937
938 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
939 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
940 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
941
942 if (EXT2_INODE_SIZE(sb) == 0)
943 goto cantfind_ext2;
944 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb);
945 if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0)
946 goto cantfind_ext2;
947 sbi->s_itb_per_group = sbi->s_inodes_per_group /
948 sbi->s_inodes_per_block;
949 sbi->s_desc_per_block = sb->s_blocksize /
950 sizeof (struct ext2_group_desc);
951 sbi->s_sbh = bh;
952 sbi->s_mount_state = le16_to_cpu(es->s_state);
953 sbi->s_addr_per_block_bits =
954 ilog2 (EXT2_ADDR_PER_BLOCK(sb));
955 sbi->s_desc_per_block_bits =
956 ilog2 (EXT2_DESC_PER_BLOCK(sb));
957
958 if (sb->s_magic != EXT2_SUPER_MAGIC)
959 goto cantfind_ext2;
960
961 if (sb->s_blocksize != bh->b_size) {
962 if (!silent)
963 ext2_msg(sb, KERN_ERR, "error: unsupported blocksize");
964 goto failed_mount;
965 }
966
967 if (sb->s_blocksize != sbi->s_frag_size) {
968 ext2_msg(sb, KERN_ERR,
969 "error: fragsize %lu != blocksize %lu"
970 "(not supported yet)",
971 sbi->s_frag_size, sb->s_blocksize);
972 goto failed_mount;
973 }
974
975 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) {
976 ext2_msg(sb, KERN_ERR,
977 "error: #blocks per group too big: %lu",
978 sbi->s_blocks_per_group);
979 goto failed_mount;
980 }
981 if (sbi->s_frags_per_group > sb->s_blocksize * 8) {
982 ext2_msg(sb, KERN_ERR,
983 "error: #fragments per group too big: %lu",
984 sbi->s_frags_per_group);
985 goto failed_mount;
986 }
987 if (sbi->s_inodes_per_group > sb->s_blocksize * 8) {
988 ext2_msg(sb, KERN_ERR,
989 "error: #inodes per group too big: %lu",
990 sbi->s_inodes_per_group);
991 goto failed_mount;
992 }
993
994 if (EXT2_BLOCKS_PER_GROUP(sb) == 0)
995 goto cantfind_ext2;
996 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
997 le32_to_cpu(es->s_first_data_block) - 1)
998 / EXT2_BLOCKS_PER_GROUP(sb)) + 1;
999 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
1000 EXT2_DESC_PER_BLOCK(sb);
1001 sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL);
1002 if (sbi->s_group_desc == NULL) {
1003 ext2_msg(sb, KERN_ERR, "error: not enough memory");
1004 goto failed_mount;
1005 }
1006 bgl_lock_init(sbi->s_blockgroup_lock);
1007 sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL);
1008 if (!sbi->s_debts) {
1009 ext2_msg(sb, KERN_ERR, "error: not enough memory");
1010 goto failed_mount_group_desc;
1011 }
1012 for (i = 0; i < db_count; i++) {
1013 block = descriptor_loc(sb, logic_sb_block, i);
1014 sbi->s_group_desc[i] = sb_bread(sb, block);
1015 if (!sbi->s_group_desc[i]) {
1016 for (j = 0; j < i; j++)
1017 brelse (sbi->s_group_desc[j]);
1018 ext2_msg(sb, KERN_ERR,
1019 "error: unable to read group descriptors");
1020 goto failed_mount_group_desc;
1021 }
1022 }
1023 if (!ext2_check_descriptors (sb)) {
1024 ext2_msg(sb, KERN_ERR, "group descriptors corrupted");
1025 goto failed_mount2;
1026 }
1027 sbi->s_gdb_count = db_count;
1028 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1029 spin_lock_init(&sbi->s_next_gen_lock);
1030
1031 /* per fileystem reservation list head & lock */
1032 spin_lock_init(&sbi->s_rsv_window_lock);
1033 sbi->s_rsv_window_root = RB_ROOT;
1034 /*
1035 * Add a single, static dummy reservation to the start of the
1036 * reservation window list --- it gives us a placeholder for
1037 * append-at-start-of-list which makes the allocation logic
1038 * _much_ simpler.
1039 */
1040 sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
1041 sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
1042 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1043 sbi->s_rsv_window_head.rsv_goal_size = 0;
1044 ext2_rsv_window_add(sb, &sbi->s_rsv_window_head);
1045
1046 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1047 ext2_count_free_blocks(sb));
1048 if (!err) {
1049 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1050 ext2_count_free_inodes(sb));
1051 }
1052 if (!err) {
1053 err = percpu_counter_init(&sbi->s_dirs_counter,
1054 ext2_count_dirs(sb));
1055 }
1056 if (err) {
1057 ext2_msg(sb, KERN_ERR, "error: insufficient memory");
1058 goto failed_mount3;
1059 }
1060 /*
1061 * set up enough so that it can read an inode
1062 */
1063 sb->s_op = &ext2_sops;
1064 sb->s_export_op = &ext2_export_ops;
1065 sb->s_xattr = ext2_xattr_handlers;
1066
1067 #ifdef CONFIG_QUOTA
1068 sb->dq_op = &dquot_operations;
1069 sb->s_qcop = &dquot_quotactl_ops;
1070 #endif
1071
1072 root = ext2_iget(sb, EXT2_ROOT_INO);
1073 if (IS_ERR(root)) {
1074 ret = PTR_ERR(root);
1075 goto failed_mount3;
1076 }
1077 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1078 iput(root);
1079 ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
1080 goto failed_mount3;
1081 }
1082
1083 sb->s_root = d_alloc_root(root);
1084 if (!sb->s_root) {
1085 iput(root);
1086 ext2_msg(sb, KERN_ERR, "error: get root inode failed");
1087 ret = -ENOMEM;
1088 goto failed_mount3;
1089 }
1090 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL))
1091 ext2_msg(sb, KERN_WARNING,
1092 "warning: mounting ext3 filesystem as ext2");
1093 if (ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY))
1094 sb->s_flags |= MS_RDONLY;
1095 ext2_write_super(sb);
1096 return 0;
1097
1098 cantfind_ext2:
1099 if (!silent)
1100 ext2_msg(sb, KERN_ERR,
1101 "error: can't find an ext2 filesystem on dev %s.",
1102 sb->s_id);
1103 goto failed_mount;
1104 failed_mount3:
1105 percpu_counter_destroy(&sbi->s_freeblocks_counter);
1106 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1107 percpu_counter_destroy(&sbi->s_dirs_counter);
1108 failed_mount2:
1109 for (i = 0; i < db_count; i++)
1110 brelse(sbi->s_group_desc[i]);
1111 failed_mount_group_desc:
1112 kfree(sbi->s_group_desc);
1113 kfree(sbi->s_debts);
1114 failed_mount:
1115 brelse(bh);
1116 failed_sbi:
1117 sb->s_fs_info = NULL;
1118 kfree(sbi->s_blockgroup_lock);
1119 kfree(sbi);
1120 failed_unlock:
1121 return ret;
1122 }
1123
1124 static void ext2_clear_super_error(struct super_block *sb)
1125 {
1126 struct buffer_head *sbh = EXT2_SB(sb)->s_sbh;
1127
1128 if (buffer_write_io_error(sbh)) {
1129 /*
1130 * Oh, dear. A previous attempt to write the
1131 * superblock failed. This could happen because the
1132 * USB device was yanked out. Or it could happen to
1133 * be a transient write error and maybe the block will
1134 * be remapped. Nothing we can do but to retry the
1135 * write and hope for the best.
1136 */
1137 ext2_msg(sb, KERN_ERR,
1138 "previous I/O error to superblock detected\n");
1139 clear_buffer_write_io_error(sbh);
1140 set_buffer_uptodate(sbh);
1141 }
1142 }
1143
1144 static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es,
1145 int wait)
1146 {
1147 ext2_clear_super_error(sb);
1148 spin_lock(&EXT2_SB(sb)->s_lock);
1149 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb));
1150 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb));
1151 es->s_wtime = cpu_to_le32(get_seconds());
1152 /* unlock before we do IO */
1153 spin_unlock(&EXT2_SB(sb)->s_lock);
1154 mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
1155 if (wait)
1156 sync_dirty_buffer(EXT2_SB(sb)->s_sbh);
1157 sb->s_dirt = 0;
1158 }
1159
1160 /*
1161 * In the second extended file system, it is not necessary to
1162 * write the super block since we use a mapping of the
1163 * disk super block in a buffer.
1164 *
1165 * However, this function is still used to set the fs valid
1166 * flags to 0. We need to set this flag to 0 since the fs
1167 * may have been checked while mounted and e2fsck may have
1168 * set s_state to EXT2_VALID_FS after some corrections.
1169 */
1170 static int ext2_sync_fs(struct super_block *sb, int wait)
1171 {
1172 struct ext2_sb_info *sbi = EXT2_SB(sb);
1173 struct ext2_super_block *es = EXT2_SB(sb)->s_es;
1174
1175 spin_lock(&sbi->s_lock);
1176 if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) {
1177 ext2_debug("setting valid to 0\n");
1178 es->s_state &= cpu_to_le16(~EXT2_VALID_FS);
1179 }
1180 spin_unlock(&sbi->s_lock);
1181 ext2_sync_super(sb, es, wait);
1182 return 0;
1183 }
1184
1185
1186 void ext2_write_super(struct super_block *sb)
1187 {
1188 if (!(sb->s_flags & MS_RDONLY))
1189 ext2_sync_fs(sb, 1);
1190 else
1191 sb->s_dirt = 0;
1192 }
1193
1194 static int ext2_remount (struct super_block * sb, int * flags, char * data)
1195 {
1196 struct ext2_sb_info * sbi = EXT2_SB(sb);
1197 struct ext2_super_block * es;
1198 unsigned long old_mount_opt = sbi->s_mount_opt;
1199 struct ext2_mount_options old_opts;
1200 unsigned long old_sb_flags;
1201 int err;
1202
1203 spin_lock(&sbi->s_lock);
1204
1205 /* Store the old options */
1206 old_sb_flags = sb->s_flags;
1207 old_opts.s_mount_opt = sbi->s_mount_opt;
1208 old_opts.s_resuid = sbi->s_resuid;
1209 old_opts.s_resgid = sbi->s_resgid;
1210
1211 /*
1212 * Allow the "check" option to be passed as a remount option.
1213 */
1214 if (!parse_options(data, sb)) {
1215 err = -EINVAL;
1216 goto restore_opts;
1217 }
1218
1219 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1220 ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1221
1222 ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset
1223 EXT2_MOUNT_XIP if not */
1224
1225 if ((ext2_use_xip(sb)) && (sb->s_blocksize != PAGE_SIZE)) {
1226 ext2_msg(sb, KERN_WARNING,
1227 "warning: unsupported blocksize for xip");
1228 err = -EINVAL;
1229 goto restore_opts;
1230 }
1231
1232 es = sbi->s_es;
1233 if ((sbi->s_mount_opt ^ old_mount_opt) & EXT2_MOUNT_XIP) {
1234 ext2_msg(sb, KERN_WARNING, "warning: refusing change of "
1235 "xip flag with busy inodes while remounting");
1236 sbi->s_mount_opt &= ~EXT2_MOUNT_XIP;
1237 sbi->s_mount_opt |= old_mount_opt & EXT2_MOUNT_XIP;
1238 }
1239 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) {
1240 spin_unlock(&sbi->s_lock);
1241 return 0;
1242 }
1243 if (*flags & MS_RDONLY) {
1244 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS ||
1245 !(sbi->s_mount_state & EXT2_VALID_FS)) {
1246 spin_unlock(&sbi->s_lock);
1247 return 0;
1248 }
1249
1250 /*
1251 * OK, we are remounting a valid rw partition rdonly, so set
1252 * the rdonly flag and then mark the partition as valid again.
1253 */
1254 es->s_state = cpu_to_le16(sbi->s_mount_state);
1255 es->s_mtime = cpu_to_le32(get_seconds());
1256 spin_unlock(&sbi->s_lock);
1257
1258 err = dquot_suspend(sb, -1);
1259 if (err < 0) {
1260 spin_lock(&sbi->s_lock);
1261 goto restore_opts;
1262 }
1263
1264 ext2_sync_super(sb, es, 1);
1265 } else {
1266 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb,
1267 ~EXT2_FEATURE_RO_COMPAT_SUPP);
1268 if (ret) {
1269 ext2_msg(sb, KERN_WARNING,
1270 "warning: couldn't remount RDWR because of "
1271 "unsupported optional features (%x).",
1272 le32_to_cpu(ret));
1273 err = -EROFS;
1274 goto restore_opts;
1275 }
1276 /*
1277 * Mounting a RDONLY partition read-write, so reread and
1278 * store the current valid flag. (It may have been changed
1279 * by e2fsck since we originally mounted the partition.)
1280 */
1281 sbi->s_mount_state = le16_to_cpu(es->s_state);
1282 if (!ext2_setup_super (sb, es, 0))
1283 sb->s_flags &= ~MS_RDONLY;
1284 spin_unlock(&sbi->s_lock);
1285
1286 ext2_write_super(sb);
1287
1288 dquot_resume(sb, -1);
1289 }
1290
1291 return 0;
1292 restore_opts:
1293 sbi->s_mount_opt = old_opts.s_mount_opt;
1294 sbi->s_resuid = old_opts.s_resuid;
1295 sbi->s_resgid = old_opts.s_resgid;
1296 sb->s_flags = old_sb_flags;
1297 spin_unlock(&sbi->s_lock);
1298 return err;
1299 }
1300
1301 static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf)
1302 {
1303 struct super_block *sb = dentry->d_sb;
1304 struct ext2_sb_info *sbi = EXT2_SB(sb);
1305 struct ext2_super_block *es = sbi->s_es;
1306 u64 fsid;
1307
1308 spin_lock(&sbi->s_lock);
1309
1310 if (test_opt (sb, MINIX_DF))
1311 sbi->s_overhead_last = 0;
1312 else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
1313 unsigned long i, overhead = 0;
1314 smp_rmb();
1315
1316 /*
1317 * Compute the overhead (FS structures). This is constant
1318 * for a given filesystem unless the number of block groups
1319 * changes so we cache the previous value until it does.
1320 */
1321
1322 /*
1323 * All of the blocks before first_data_block are
1324 * overhead
1325 */
1326 overhead = le32_to_cpu(es->s_first_data_block);
1327
1328 /*
1329 * Add the overhead attributed to the superblock and
1330 * block group descriptors. If the sparse superblocks
1331 * feature is turned on, then not all groups have this.
1332 */
1333 for (i = 0; i < sbi->s_groups_count; i++)
1334 overhead += ext2_bg_has_super(sb, i) +
1335 ext2_bg_num_gdb(sb, i);
1336
1337 /*
1338 * Every block group has an inode bitmap, a block
1339 * bitmap, and an inode table.
1340 */
1341 overhead += (sbi->s_groups_count *
1342 (2 + sbi->s_itb_per_group));
1343 sbi->s_overhead_last = overhead;
1344 smp_wmb();
1345 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
1346 }
1347
1348 buf->f_type = EXT2_SUPER_MAGIC;
1349 buf->f_bsize = sb->s_blocksize;
1350 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
1351 buf->f_bfree = ext2_count_free_blocks(sb);
1352 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
1353 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
1354 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
1355 buf->f_bavail = 0;
1356 buf->f_files = le32_to_cpu(es->s_inodes_count);
1357 buf->f_ffree = ext2_count_free_inodes(sb);
1358 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
1359 buf->f_namelen = EXT2_NAME_LEN;
1360 fsid = le64_to_cpup((void *)es->s_uuid) ^
1361 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
1362 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
1363 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
1364 spin_unlock(&sbi->s_lock);
1365 return 0;
1366 }
1367
1368 static struct dentry *ext2_mount(struct file_system_type *fs_type,
1369 int flags, const char *dev_name, void *data)
1370 {
1371 return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super);
1372 }
1373
1374 #ifdef CONFIG_QUOTA
1375
1376 /* Read data from quotafile - avoid pagecache and such because we cannot afford
1377 * acquiring the locks... As quota files are never truncated and quota code
1378 * itself serializes the operations (and noone else should touch the files)
1379 * we don't have to be afraid of races */
1380 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data,
1381 size_t len, loff_t off)
1382 {
1383 struct inode *inode = sb_dqopt(sb)->files[type];
1384 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1385 int err = 0;
1386 int offset = off & (sb->s_blocksize - 1);
1387 int tocopy;
1388 size_t toread;
1389 struct buffer_head tmp_bh;
1390 struct buffer_head *bh;
1391 loff_t i_size = i_size_read(inode);
1392
1393 if (off > i_size)
1394 return 0;
1395 if (off+len > i_size)
1396 len = i_size-off;
1397 toread = len;
1398 while (toread > 0) {
1399 tocopy = sb->s_blocksize - offset < toread ?
1400 sb->s_blocksize - offset : toread;
1401
1402 tmp_bh.b_state = 0;
1403 tmp_bh.b_size = sb->s_blocksize;
1404 err = ext2_get_block(inode, blk, &tmp_bh, 0);
1405 if (err < 0)
1406 return err;
1407 if (!buffer_mapped(&tmp_bh)) /* A hole? */
1408 memset(data, 0, tocopy);
1409 else {
1410 bh = sb_bread(sb, tmp_bh.b_blocknr);
1411 if (!bh)
1412 return -EIO;
1413 memcpy(data, bh->b_data+offset, tocopy);
1414 brelse(bh);
1415 }
1416 offset = 0;
1417 toread -= tocopy;
1418 data += tocopy;
1419 blk++;
1420 }
1421 return len;
1422 }
1423
1424 /* Write to quotafile */
1425 static ssize_t ext2_quota_write(struct super_block *sb, int type,
1426 const char *data, size_t len, loff_t off)
1427 {
1428 struct inode *inode = sb_dqopt(sb)->files[type];
1429 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
1430 int err = 0;
1431 int offset = off & (sb->s_blocksize - 1);
1432 int tocopy;
1433 size_t towrite = len;
1434 struct buffer_head tmp_bh;
1435 struct buffer_head *bh;
1436
1437 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
1438 while (towrite > 0) {
1439 tocopy = sb->s_blocksize - offset < towrite ?
1440 sb->s_blocksize - offset : towrite;
1441
1442 tmp_bh.b_state = 0;
1443 err = ext2_get_block(inode, blk, &tmp_bh, 1);
1444 if (err < 0)
1445 goto out;
1446 if (offset || tocopy != EXT2_BLOCK_SIZE(sb))
1447 bh = sb_bread(sb, tmp_bh.b_blocknr);
1448 else
1449 bh = sb_getblk(sb, tmp_bh.b_blocknr);
1450 if (!bh) {
1451 err = -EIO;
1452 goto out;
1453 }
1454 lock_buffer(bh);
1455 memcpy(bh->b_data+offset, data, tocopy);
1456 flush_dcache_page(bh->b_page);
1457 set_buffer_uptodate(bh);
1458 mark_buffer_dirty(bh);
1459 unlock_buffer(bh);
1460 brelse(bh);
1461 offset = 0;
1462 towrite -= tocopy;
1463 data += tocopy;
1464 blk++;
1465 }
1466 out:
1467 if (len == towrite) {
1468 mutex_unlock(&inode->i_mutex);
1469 return err;
1470 }
1471 if (inode->i_size < off+len-towrite)
1472 i_size_write(inode, off+len-towrite);
1473 inode->i_version++;
1474 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
1475 mark_inode_dirty(inode);
1476 mutex_unlock(&inode->i_mutex);
1477 return len - towrite;
1478 }
1479
1480 #endif
1481
1482 static struct file_system_type ext2_fs_type = {
1483 .owner = THIS_MODULE,
1484 .name = "ext2",
1485 .mount = ext2_mount,
1486 .kill_sb = kill_block_super,
1487 .fs_flags = FS_REQUIRES_DEV,
1488 };
1489
1490 static int __init init_ext2_fs(void)
1491 {
1492 int err = init_ext2_xattr();
1493 if (err)
1494 return err;
1495 err = init_inodecache();
1496 if (err)
1497 goto out1;
1498 err = register_filesystem(&ext2_fs_type);
1499 if (err)
1500 goto out;
1501 return 0;
1502 out:
1503 destroy_inodecache();
1504 out1:
1505 exit_ext2_xattr();
1506 return err;
1507 }
1508
1509 static void __exit exit_ext2_fs(void)
1510 {
1511 unregister_filesystem(&ext2_fs_type);
1512 destroy_inodecache();
1513 exit_ext2_xattr();
1514 }
1515
1516 module_init(init_ext2_fs)
1517 module_exit(exit_ext2_fs)
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree