?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
mtd: nand: print out the right information for JEDEC compliant NAND
[linux-2.6/btrfs-unstable.git] / fs / affs / super.c
blobd098731b82ffa794853e66ff0bcb4e05aa59fcbc
1 /*
2 * linux/fs/affs/inode.c
3 *
4 * (c) 1996 Hans-Joachim Widmaier - Rewritten
5 *
6 * (C) 1993 Ray Burr - Modified for Amiga FFS filesystem.
7 *
8 * (C) 1992 Eric Youngdale Modified for ISO 9660 filesystem.
9 *
10 * (C) 1991 Linus Torvalds - minix filesystem
11 */
12
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/statfs.h>
16 #include <linux/parser.h>
17 #include <linux/magic.h>
18 #include <linux/sched.h>
19 #include <linux/slab.h>
20 #include <linux/writeback.h>
21 #include "affs.h"
22
23 extern struct timezone sys_tz;
24
25 static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
26 static int affs_remount (struct super_block *sb, int *flags, char *data);
27
28 static void
29 affs_commit_super(struct super_block *sb, int wait)
30 {
31 struct affs_sb_info *sbi = AFFS_SB(sb);
32 struct buffer_head *bh = sbi->s_root_bh;
33 struct affs_root_tail *tail = AFFS_ROOT_TAIL(sb, bh);
34
35 lock_buffer(bh);
36 secs_to_datestamp(get_seconds(), &tail->disk_change);
37 affs_fix_checksum(sb, bh);
38 unlock_buffer(bh);
39
40 mark_buffer_dirty(bh);
41 if (wait)
42 sync_dirty_buffer(bh);
43 }
44
45 static void
46 affs_put_super(struct super_block *sb)
47 {
48 struct affs_sb_info *sbi = AFFS_SB(sb);
49 pr_debug("AFFS: put_super()\n");
50
51 cancel_delayed_work_sync(&sbi->sb_work);
52 }
53
54 static int
55 affs_sync_fs(struct super_block *sb, int wait)
56 {
57 affs_commit_super(sb, wait);
58 return 0;
59 }
60
61 static void flush_superblock(struct work_struct *work)
62 {
63 struct affs_sb_info *sbi;
64 struct super_block *sb;
65
66 sbi = container_of(work, struct affs_sb_info, sb_work.work);
67 sb = sbi->sb;
68
69 spin_lock(&sbi->work_lock);
70 sbi->work_queued = 0;
71 spin_unlock(&sbi->work_lock);
72
73 affs_commit_super(sb, 1);
74 }
75
76 void affs_mark_sb_dirty(struct super_block *sb)
77 {
78 struct affs_sb_info *sbi = AFFS_SB(sb);
79 unsigned long delay;
80
81 if (sb->s_flags & MS_RDONLY)
82 return;
83
84 spin_lock(&sbi->work_lock);
85 if (!sbi->work_queued) {
86 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
87 queue_delayed_work(system_long_wq, &sbi->sb_work, delay);
88 sbi->work_queued = 1;
89 }
90 spin_unlock(&sbi->work_lock);
91 }
92
93 static struct kmem_cache * affs_inode_cachep;
94
95 static struct inode *affs_alloc_inode(struct super_block *sb)
96 {
97 struct affs_inode_info *i;
98
99 i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
100 if (!i)
101 return NULL;
102
103 i->vfs_inode.i_version = 1;
104 i->i_lc = NULL;
105 i->i_ext_bh = NULL;
106 i->i_pa_cnt = 0;
107
108 return &i->vfs_inode;
109 }
110
111 static void affs_i_callback(struct rcu_head *head)
112 {
113 struct inode *inode = container_of(head, struct inode, i_rcu);
114 kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
115 }
116
117 static void affs_destroy_inode(struct inode *inode)
118 {
119 call_rcu(&inode->i_rcu, affs_i_callback);
120 }
121
122 static void init_once(void *foo)
123 {
124 struct affs_inode_info *ei = (struct affs_inode_info *) foo;
125
126 sema_init(&ei->i_link_lock, 1);
127 sema_init(&ei->i_ext_lock, 1);
128 inode_init_once(&ei->vfs_inode);
129 }
130
131 static int init_inodecache(void)
132 {
133 affs_inode_cachep = kmem_cache_create("affs_inode_cache",
134 sizeof(struct affs_inode_info),
135 0, (SLAB_RECLAIM_ACCOUNT|
136 SLAB_MEM_SPREAD),
137 init_once);
138 if (affs_inode_cachep == NULL)
139 return -ENOMEM;
140 return 0;
141 }
142
143 static void destroy_inodecache(void)
144 {
145 /*
146 * Make sure all delayed rcu free inodes are flushed before we
147 * destroy cache.
148 */
149 rcu_barrier();
150 kmem_cache_destroy(affs_inode_cachep);
151 }
152
153 static const struct super_operations affs_sops = {
154 .alloc_inode = affs_alloc_inode,
155 .destroy_inode = affs_destroy_inode,
156 .write_inode = affs_write_inode,
157 .evict_inode = affs_evict_inode,
158 .put_super = affs_put_super,
159 .sync_fs = affs_sync_fs,
160 .statfs = affs_statfs,
161 .remount_fs = affs_remount,
162 .show_options = generic_show_options,
163 };
164
165 enum {
166 Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect,
167 Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
168 Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
169 };
170
171 static const match_table_t tokens = {
172 {Opt_bs, "bs=%u"},
173 {Opt_mode, "mode=%o"},
174 {Opt_mufs, "mufs"},
175 {Opt_prefix, "prefix=%s"},
176 {Opt_protect, "protect"},
177 {Opt_reserved, "reserved=%u"},
178 {Opt_root, "root=%u"},
179 {Opt_setgid, "setgid=%u"},
180 {Opt_setuid, "setuid=%u"},
181 {Opt_verbose, "verbose"},
182 {Opt_volume, "volume=%s"},
183 {Opt_ignore, "grpquota"},
184 {Opt_ignore, "noquota"},
185 {Opt_ignore, "quota"},
186 {Opt_ignore, "usrquota"},
187 {Opt_err, NULL},
188 };
189
190 static int
191 parse_options(char *options, kuid_t *uid, kgid_t *gid, int *mode, int *reserved, s32 *root,
192 int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
193 {
194 char *p;
195 substring_t args[MAX_OPT_ARGS];
196
197 /* Fill in defaults */
198
199 *uid = current_uid();
200 *gid = current_gid();
201 *reserved = 2;
202 *root = -1;
203 *blocksize = -1;
204 volume[0] = ':';
205 volume[1] = 0;
206 *mount_opts = 0;
207 if (!options)
208 return 1;
209
210 while ((p = strsep(&options, ",")) != NULL) {
211 int token, n, option;
212 if (!*p)
213 continue;
214
215 token = match_token(p, tokens, args);
216 switch (token) {
217 case Opt_bs:
218 if (match_int(&args[0], &n))
219 return 0;
220 if (n != 512 && n != 1024 && n != 2048
221 && n != 4096) {
222 printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
223 return 0;
224 }
225 *blocksize = n;
226 break;
227 case Opt_mode:
228 if (match_octal(&args[0], &option))
229 return 0;
230 *mode = option & 0777;
231 *mount_opts |= SF_SETMODE;
232 break;
233 case Opt_mufs:
234 *mount_opts |= SF_MUFS;
235 break;
236 case Opt_prefix:
237 *prefix = match_strdup(&args[0]);
238 if (!*prefix)
239 return 0;
240 *mount_opts |= SF_PREFIX;
241 break;
242 case Opt_protect:
243 *mount_opts |= SF_IMMUTABLE;
244 break;
245 case Opt_reserved:
246 if (match_int(&args[0], reserved))
247 return 0;
248 break;
249 case Opt_root:
250 if (match_int(&args[0], root))
251 return 0;
252 break;
253 case Opt_setgid:
254 if (match_int(&args[0], &option))
255 return 0;
256 *gid = make_kgid(current_user_ns(), option);
257 if (!gid_valid(*gid))
258 return 0;
259 *mount_opts |= SF_SETGID;
260 break;
261 case Opt_setuid:
262 if (match_int(&args[0], &option))
263 return 0;
264 *uid = make_kuid(current_user_ns(), option);
265 if (!uid_valid(*uid))
266 return 0;
267 *mount_opts |= SF_SETUID;
268 break;
269 case Opt_verbose:
270 *mount_opts |= SF_VERBOSE;
271 break;
272 case Opt_volume: {
273 char *vol = match_strdup(&args[0]);
274 if (!vol)
275 return 0;
276 strlcpy(volume, vol, 32);
277 kfree(vol);
278 break;
279 }
280 case Opt_ignore:
281 /* Silently ignore the quota options */
282 break;
283 default:
284 printk("AFFS: Unrecognized mount option \"%s\" "
285 "or missing value\n", p);
286 return 0;
287 }
288 }
289 return 1;
290 }
291
292 /* This function definitely needs to be split up. Some fine day I'll
293 * hopefully have the guts to do so. Until then: sorry for the mess.
294 */
295
296 static int affs_fill_super(struct super_block *sb, void *data, int silent)
297 {
298 struct affs_sb_info *sbi;
299 struct buffer_head *root_bh = NULL;
300 struct buffer_head *boot_bh;
301 struct inode *root_inode = NULL;
302 s32 root_block;
303 int size, blocksize;
304 u32 chksum;
305 int num_bm;
306 int i, j;
307 s32 key;
308 kuid_t uid;
309 kgid_t gid;
310 int reserved;
311 unsigned long mount_flags;
312 int tmp_flags; /* fix remount prototype... */
313 u8 sig[4];
314 int ret;
315
316 save_mount_options(sb, data);
317
318 pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");
319
320 sb->s_magic = AFFS_SUPER_MAGIC;
321 sb->s_op = &affs_sops;
322 sb->s_flags |= MS_NODIRATIME;
323
324 sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
325 if (!sbi)
326 return -ENOMEM;
327
328 sb->s_fs_info = sbi;
329 sbi->sb = sb;
330 mutex_init(&sbi->s_bmlock);
331 spin_lock_init(&sbi->symlink_lock);
332 spin_lock_init(&sbi->work_lock);
333 INIT_DELAYED_WORK(&sbi->sb_work, flush_superblock);
334
335 if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
336 &blocksize,&sbi->s_prefix,
337 sbi->s_volume, &mount_flags)) {
338 printk(KERN_ERR "AFFS: Error parsing options\n");
339 kfree(sbi->s_prefix);
340 kfree(sbi);
341 return -EINVAL;
342 }
343 /* N.B. after this point s_prefix must be released */
344
345 sbi->s_flags = mount_flags;
346 sbi->s_mode = i;
347 sbi->s_uid = uid;
348 sbi->s_gid = gid;
349 sbi->s_reserved= reserved;
350
351 /* Get the size of the device in 512-byte blocks.
352 * If we later see that the partition uses bigger
353 * blocks, we will have to change it.
354 */
355
356 size = sb->s_bdev->bd_inode->i_size >> 9;
357 pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size);
358
359 affs_set_blocksize(sb, PAGE_SIZE);
360 /* Try to find root block. Its location depends on the block size. */
361
362 i = 512;
363 j = 4096;
364 if (blocksize > 0) {
365 i = j = blocksize;
366 size = size / (blocksize / 512);
367 }
368 for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
369 sbi->s_root_block = root_block;
370 if (root_block < 0)
371 sbi->s_root_block = (reserved + size - 1) / 2;
372 pr_debug("AFFS: setting blocksize to %d\n", blocksize);
373 affs_set_blocksize(sb, blocksize);
374 sbi->s_partition_size = size;
375
376 /* The root block location that was calculated above is not
377 * correct if the partition size is an odd number of 512-
378 * byte blocks, which will be rounded down to a number of
379 * 1024-byte blocks, and if there were an even number of
380 * reserved blocks. Ideally, all partition checkers should
381 * report the real number of blocks of the real blocksize,
382 * but since this just cannot be done, we have to try to
383 * find the root block anyways. In the above case, it is one
384 * block behind the calculated one. So we check this one, too.
385 */
386 for (num_bm = 0; num_bm < 2; num_bm++) {
387 pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, "
388 "size=%d, reserved=%d\n",
389 sb->s_id,
390 sbi->s_root_block + num_bm,
391 blocksize, size, reserved);
392 root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
393 if (!root_bh)
394 continue;
395 if (!affs_checksum_block(sb, root_bh) &&
396 be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
397 be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
398 sbi->s_hashsize = blocksize / 4 - 56;
399 sbi->s_root_block += num_bm;
400 key = 1;
401 goto got_root;
402 }
403 affs_brelse(root_bh);
404 root_bh = NULL;
405 }
406 }
407 if (!silent)
408 printk(KERN_ERR "AFFS: No valid root block on device %s\n",
409 sb->s_id);
410 return -EINVAL;
411
412 /* N.B. after this point bh must be released */
413 got_root:
414 /* Keep super block in cache */
415 sbi->s_root_bh = root_bh;
416 root_block = sbi->s_root_block;
417
418 /* Find out which kind of FS we have */
419 boot_bh = sb_bread(sb, 0);
420 if (!boot_bh) {
421 printk(KERN_ERR "AFFS: Cannot read boot block\n");
422 return -EINVAL;
423 }
424 memcpy(sig, boot_bh->b_data, 4);
425 brelse(boot_bh);
426 chksum = be32_to_cpu(*(__be32 *)sig);
427
428 /* Dircache filesystems are compatible with non-dircache ones
429 * when reading. As long as they aren't supported, writing is
430 * not recommended.
431 */
432 if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
433 || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
434 printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n",
435 sb->s_id);
436 sb->s_flags |= MS_RDONLY;
437 }
438 switch (chksum) {
439 case MUFS_FS:
440 case MUFS_INTLFFS:
441 case MUFS_DCFFS:
442 sbi->s_flags |= SF_MUFS;
443 /* fall thru */
444 case FS_INTLFFS:
445 case FS_DCFFS:
446 sbi->s_flags |= SF_INTL;
447 break;
448 case MUFS_FFS:
449 sbi->s_flags |= SF_MUFS;
450 break;
451 case FS_FFS:
452 break;
453 case MUFS_OFS:
454 sbi->s_flags |= SF_MUFS;
455 /* fall thru */
456 case FS_OFS:
457 sbi->s_flags |= SF_OFS;
458 sb->s_flags |= MS_NOEXEC;
459 break;
460 case MUFS_DCOFS:
461 case MUFS_INTLOFS:
462 sbi->s_flags |= SF_MUFS;
463 case FS_DCOFS:
464 case FS_INTLOFS:
465 sbi->s_flags |= SF_INTL | SF_OFS;
466 sb->s_flags |= MS_NOEXEC;
467 break;
468 default:
469 printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n",
470 sb->s_id, chksum);
471 return -EINVAL;
472 }
473
474 if (mount_flags & SF_VERBOSE) {
475 u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
476 printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
477 len > 31 ? 31 : len,
478 AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
479 sig, sig[3] + '0', blocksize);
480 }
481
482 sb->s_flags |= MS_NODEV | MS_NOSUID;
483
484 sbi->s_data_blksize = sb->s_blocksize;
485 if (sbi->s_flags & SF_OFS)
486 sbi->s_data_blksize -= 24;
487
488 tmp_flags = sb->s_flags;
489 ret = affs_init_bitmap(sb, &tmp_flags);
490 if (ret)
491 return ret;
492 sb->s_flags = tmp_flags;
493
494 /* set up enough so that it can read an inode */
495
496 root_inode = affs_iget(sb, root_block);
497 if (IS_ERR(root_inode))
498 return PTR_ERR(root_inode);
499
500 if (AFFS_SB(sb)->s_flags & SF_INTL)
501 sb->s_d_op = &affs_intl_dentry_operations;
502 else
503 sb->s_d_op = &affs_dentry_operations;
504
505 sb->s_root = d_make_root(root_inode);
506 if (!sb->s_root) {
507 printk(KERN_ERR "AFFS: Get root inode failed\n");
508 return -ENOMEM;
509 }
510
511 pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
512 return 0;
513 }
514
515 static int
516 affs_remount(struct super_block *sb, int *flags, char *data)
517 {
518 struct affs_sb_info *sbi = AFFS_SB(sb);
519 int blocksize;
520 kuid_t uid;
521 kgid_t gid;
522 int mode;
523 int reserved;
524 int root_block;
525 unsigned long mount_flags;
526 int res = 0;
527 char *new_opts = kstrdup(data, GFP_KERNEL);
528 char volume[32];
529 char *prefix = NULL;
530
531 pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data);
532
533 *flags |= MS_NODIRATIME;
534
535 memcpy(volume, sbi->s_volume, 32);
536 if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
537 &blocksize, &prefix, volume,
538 &mount_flags)) {
539 kfree(prefix);
540 kfree(new_opts);
541 return -EINVAL;
542 }
543
544 flush_delayed_work(&sbi->sb_work);
545 replace_mount_options(sb, new_opts);
546
547 sbi->s_flags = mount_flags;
548 sbi->s_mode = mode;
549 sbi->s_uid = uid;
550 sbi->s_gid = gid;
551 /* protect against readers */
552 spin_lock(&sbi->symlink_lock);
553 if (prefix) {
554 kfree(sbi->s_prefix);
555 sbi->s_prefix = prefix;
556 }
557 memcpy(sbi->s_volume, volume, 32);
558 spin_unlock(&sbi->symlink_lock);
559
560 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
561 return 0;
562
563 if (*flags & MS_RDONLY)
564 affs_free_bitmap(sb);
565 else
566 res = affs_init_bitmap(sb, flags);
567
568 return res;
569 }
570
571 static int
572 affs_statfs(struct dentry *dentry, struct kstatfs *buf)
573 {
574 struct super_block *sb = dentry->d_sb;
575 int free;
576 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
577
578 pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size,
579 AFFS_SB(sb)->s_reserved);
580
581 free = affs_count_free_blocks(sb);
582 buf->f_type = AFFS_SUPER_MAGIC;
583 buf->f_bsize = sb->s_blocksize;
584 buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
585 buf->f_bfree = free;
586 buf->f_bavail = free;
587 buf->f_fsid.val[0] = (u32)id;
588 buf->f_fsid.val[1] = (u32)(id >> 32);
589 buf->f_namelen = 30;
590 return 0;
591 }
592
593 static struct dentry *affs_mount(struct file_system_type *fs_type,
594 int flags, const char *dev_name, void *data)
595 {
596 return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super);
597 }
598
599 static void affs_kill_sb(struct super_block *sb)
600 {
601 struct affs_sb_info *sbi = AFFS_SB(sb);
602 kill_block_super(sb);
603 if (sbi) {
604 affs_free_bitmap(sb);
605 affs_brelse(sbi->s_root_bh);
606 kfree(sbi->s_prefix);
607 kfree(sbi);
608 }
609 }
610
611 static struct file_system_type affs_fs_type = {
612 .owner = THIS_MODULE,
613 .name = "affs",
614 .mount = affs_mount,
615 .kill_sb = affs_kill_sb,
616 .fs_flags = FS_REQUIRES_DEV,
617 };
618 MODULE_ALIAS_FS("affs");
619
620 static int __init init_affs_fs(void)
621 {
622 int err = init_inodecache();
623 if (err)
624 goto out1;
625 err = register_filesystem(&affs_fs_type);
626 if (err)
627 goto out;
628 return 0;
629 out:
630 destroy_inodecache();
631 out1:
632 return err;
633 }
634
635 static void __exit exit_affs_fs(void)
636 {
637 unregister_filesystem(&affs_fs_type);
638 destroy_inodecache();
639 }
640
641 MODULE_DESCRIPTION("Amiga filesystem support for Linux");
642 MODULE_LICENSE("GPL");
643
644 module_init(init_affs_fs)
645 module_exit(exit_affs_fs)
(deprecated) Btrfs devel tree