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Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm...
[linux-2.6.git] / fs / affs / super.c
blob45161a832bbc9e4aa2d7f6b72a950273e0af7062
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 kfree(sbi->s_prefix);
53 affs_free_bitmap(sb);
54 affs_brelse(sbi->s_root_bh);
55 kfree(sbi);
56 sb->s_fs_info = NULL;
57 }
58
59 static int
60 affs_sync_fs(struct super_block *sb, int wait)
61 {
62 affs_commit_super(sb, wait);
63 return 0;
64 }
65
66 static void flush_superblock(struct work_struct *work)
67 {
68 struct affs_sb_info *sbi;
69 struct super_block *sb;
70
71 sbi = container_of(work, struct affs_sb_info, sb_work.work);
72 sb = sbi->sb;
73
74 spin_lock(&sbi->work_lock);
75 sbi->work_queued = 0;
76 spin_unlock(&sbi->work_lock);
77
78 affs_commit_super(sb, 1);
79 }
80
81 void affs_mark_sb_dirty(struct super_block *sb)
82 {
83 struct affs_sb_info *sbi = AFFS_SB(sb);
84 unsigned long delay;
85
86 if (sb->s_flags & MS_RDONLY)
87 return;
88
89 spin_lock(&sbi->work_lock);
90 if (!sbi->work_queued) {
91 delay = msecs_to_jiffies(dirty_writeback_interval * 10);
92 queue_delayed_work(system_long_wq, &sbi->sb_work, delay);
93 sbi->work_queued = 1;
94 }
95 spin_unlock(&sbi->work_lock);
96 }
97
98 static struct kmem_cache * affs_inode_cachep;
99
100 static struct inode *affs_alloc_inode(struct super_block *sb)
101 {
102 struct affs_inode_info *i;
103
104 i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
105 if (!i)
106 return NULL;
107
108 i->vfs_inode.i_version = 1;
109 i->i_lc = NULL;
110 i->i_ext_bh = NULL;
111 i->i_pa_cnt = 0;
112
113 return &i->vfs_inode;
114 }
115
116 static void affs_i_callback(struct rcu_head *head)
117 {
118 struct inode *inode = container_of(head, struct inode, i_rcu);
119 kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
120 }
121
122 static void affs_destroy_inode(struct inode *inode)
123 {
124 call_rcu(&inode->i_rcu, affs_i_callback);
125 }
126
127 static void init_once(void *foo)
128 {
129 struct affs_inode_info *ei = (struct affs_inode_info *) foo;
130
131 sema_init(&ei->i_link_lock, 1);
132 sema_init(&ei->i_ext_lock, 1);
133 inode_init_once(&ei->vfs_inode);
134 }
135
136 static int init_inodecache(void)
137 {
138 affs_inode_cachep = kmem_cache_create("affs_inode_cache",
139 sizeof(struct affs_inode_info),
140 0, (SLAB_RECLAIM_ACCOUNT|
141 SLAB_MEM_SPREAD),
142 init_once);
143 if (affs_inode_cachep == NULL)
144 return -ENOMEM;
145 return 0;
146 }
147
148 static void destroy_inodecache(void)
149 {
150 /*
151 * Make sure all delayed rcu free inodes are flushed before we
152 * destroy cache.
153 */
154 rcu_barrier();
155 kmem_cache_destroy(affs_inode_cachep);
156 }
157
158 static const struct super_operations affs_sops = {
159 .alloc_inode = affs_alloc_inode,
160 .destroy_inode = affs_destroy_inode,
161 .write_inode = affs_write_inode,
162 .evict_inode = affs_evict_inode,
163 .put_super = affs_put_super,
164 .sync_fs = affs_sync_fs,
165 .statfs = affs_statfs,
166 .remount_fs = affs_remount,
167 .show_options = generic_show_options,
168 };
169
170 enum {
171 Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect,
172 Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
173 Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
174 };
175
176 static const match_table_t tokens = {
177 {Opt_bs, "bs=%u"},
178 {Opt_mode, "mode=%o"},
179 {Opt_mufs, "mufs"},
180 {Opt_prefix, "prefix=%s"},
181 {Opt_protect, "protect"},
182 {Opt_reserved, "reserved=%u"},
183 {Opt_root, "root=%u"},
184 {Opt_setgid, "setgid=%u"},
185 {Opt_setuid, "setuid=%u"},
186 {Opt_verbose, "verbose"},
187 {Opt_volume, "volume=%s"},
188 {Opt_ignore, "grpquota"},
189 {Opt_ignore, "noquota"},
190 {Opt_ignore, "quota"},
191 {Opt_ignore, "usrquota"},
192 {Opt_err, NULL},
193 };
194
195 static int
196 parse_options(char *options, kuid_t *uid, kgid_t *gid, int *mode, int *reserved, s32 *root,
197 int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
198 {
199 char *p;
200 substring_t args[MAX_OPT_ARGS];
201
202 /* Fill in defaults */
203
204 *uid = current_uid();
205 *gid = current_gid();
206 *reserved = 2;
207 *root = -1;
208 *blocksize = -1;
209 volume[0] = ':';
210 volume[1] = 0;
211 *mount_opts = 0;
212 if (!options)
213 return 1;
214
215 while ((p = strsep(&options, ",")) != NULL) {
216 int token, n, option;
217 if (!*p)
218 continue;
219
220 token = match_token(p, tokens, args);
221 switch (token) {
222 case Opt_bs:
223 if (match_int(&args[0], &n))
224 return 0;
225 if (n != 512 && n != 1024 && n != 2048
226 && n != 4096) {
227 printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
228 return 0;
229 }
230 *blocksize = n;
231 break;
232 case Opt_mode:
233 if (match_octal(&args[0], &option))
234 return 0;
235 *mode = option & 0777;
236 *mount_opts |= SF_SETMODE;
237 break;
238 case Opt_mufs:
239 *mount_opts |= SF_MUFS;
240 break;
241 case Opt_prefix:
242 *prefix = match_strdup(&args[0]);
243 if (!*prefix)
244 return 0;
245 *mount_opts |= SF_PREFIX;
246 break;
247 case Opt_protect:
248 *mount_opts |= SF_IMMUTABLE;
249 break;
250 case Opt_reserved:
251 if (match_int(&args[0], reserved))
252 return 0;
253 break;
254 case Opt_root:
255 if (match_int(&args[0], root))
256 return 0;
257 break;
258 case Opt_setgid:
259 if (match_int(&args[0], &option))
260 return 0;
261 *gid = make_kgid(current_user_ns(), option);
262 if (!gid_valid(*gid))
263 return 0;
264 *mount_opts |= SF_SETGID;
265 break;
266 case Opt_setuid:
267 if (match_int(&args[0], &option))
268 return 0;
269 *uid = make_kuid(current_user_ns(), option);
270 if (!uid_valid(*uid))
271 return 0;
272 *mount_opts |= SF_SETUID;
273 break;
274 case Opt_verbose:
275 *mount_opts |= SF_VERBOSE;
276 break;
277 case Opt_volume: {
278 char *vol = match_strdup(&args[0]);
279 if (!vol)
280 return 0;
281 strlcpy(volume, vol, 32);
282 kfree(vol);
283 break;
284 }
285 case Opt_ignore:
286 /* Silently ignore the quota options */
287 break;
288 default:
289 printk("AFFS: Unrecognized mount option \"%s\" "
290 "or missing value\n", p);
291 return 0;
292 }
293 }
294 return 1;
295 }
296
297 /* This function definitely needs to be split up. Some fine day I'll
298 * hopefully have the guts to do so. Until then: sorry for the mess.
299 */
300
301 static int affs_fill_super(struct super_block *sb, void *data, int silent)
302 {
303 struct affs_sb_info *sbi;
304 struct buffer_head *root_bh = NULL;
305 struct buffer_head *boot_bh;
306 struct inode *root_inode = NULL;
307 s32 root_block;
308 int size, blocksize;
309 u32 chksum;
310 int num_bm;
311 int i, j;
312 s32 key;
313 kuid_t uid;
314 kgid_t gid;
315 int reserved;
316 unsigned long mount_flags;
317 int tmp_flags; /* fix remount prototype... */
318 u8 sig[4];
319 int ret = -EINVAL;
320
321 save_mount_options(sb, data);
322
323 pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");
324
325 sb->s_magic = AFFS_SUPER_MAGIC;
326 sb->s_op = &affs_sops;
327 sb->s_flags |= MS_NODIRATIME;
328
329 sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
330 if (!sbi)
331 return -ENOMEM;
332
333 sb->s_fs_info = sbi;
334 sbi->sb = sb;
335 mutex_init(&sbi->s_bmlock);
336 spin_lock_init(&sbi->symlink_lock);
337 spin_lock_init(&sbi->work_lock);
338 INIT_DELAYED_WORK(&sbi->sb_work, flush_superblock);
339
340 if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
341 &blocksize,&sbi->s_prefix,
342 sbi->s_volume, &mount_flags)) {
343 printk(KERN_ERR "AFFS: Error parsing options\n");
344 kfree(sbi->s_prefix);
345 kfree(sbi);
346 return -EINVAL;
347 }
348 /* N.B. after this point s_prefix must be released */
349
350 sbi->s_flags = mount_flags;
351 sbi->s_mode = i;
352 sbi->s_uid = uid;
353 sbi->s_gid = gid;
354 sbi->s_reserved= reserved;
355
356 /* Get the size of the device in 512-byte blocks.
357 * If we later see that the partition uses bigger
358 * blocks, we will have to change it.
359 */
360
361 size = sb->s_bdev->bd_inode->i_size >> 9;
362 pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size);
363
364 affs_set_blocksize(sb, PAGE_SIZE);
365 /* Try to find root block. Its location depends on the block size. */
366
367 i = 512;
368 j = 4096;
369 if (blocksize > 0) {
370 i = j = blocksize;
371 size = size / (blocksize / 512);
372 }
373 for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
374 sbi->s_root_block = root_block;
375 if (root_block < 0)
376 sbi->s_root_block = (reserved + size - 1) / 2;
377 pr_debug("AFFS: setting blocksize to %d\n", blocksize);
378 affs_set_blocksize(sb, blocksize);
379 sbi->s_partition_size = size;
380
381 /* The root block location that was calculated above is not
382 * correct if the partition size is an odd number of 512-
383 * byte blocks, which will be rounded down to a number of
384 * 1024-byte blocks, and if there were an even number of
385 * reserved blocks. Ideally, all partition checkers should
386 * report the real number of blocks of the real blocksize,
387 * but since this just cannot be done, we have to try to
388 * find the root block anyways. In the above case, it is one
389 * block behind the calculated one. So we check this one, too.
390 */
391 for (num_bm = 0; num_bm < 2; num_bm++) {
392 pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, "
393 "size=%d, reserved=%d\n",
394 sb->s_id,
395 sbi->s_root_block + num_bm,
396 blocksize, size, reserved);
397 root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
398 if (!root_bh)
399 continue;
400 if (!affs_checksum_block(sb, root_bh) &&
401 be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
402 be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
403 sbi->s_hashsize = blocksize / 4 - 56;
404 sbi->s_root_block += num_bm;
405 key = 1;
406 goto got_root;
407 }
408 affs_brelse(root_bh);
409 root_bh = NULL;
410 }
411 }
412 if (!silent)
413 printk(KERN_ERR "AFFS: No valid root block on device %s\n",
414 sb->s_id);
415 goto out_error;
416
417 /* N.B. after this point bh must be released */
418 got_root:
419 root_block = sbi->s_root_block;
420
421 /* Find out which kind of FS we have */
422 boot_bh = sb_bread(sb, 0);
423 if (!boot_bh) {
424 printk(KERN_ERR "AFFS: Cannot read boot block\n");
425 goto out_error;
426 }
427 memcpy(sig, boot_bh->b_data, 4);
428 brelse(boot_bh);
429 chksum = be32_to_cpu(*(__be32 *)sig);
430
431 /* Dircache filesystems are compatible with non-dircache ones
432 * when reading. As long as they aren't supported, writing is
433 * not recommended.
434 */
435 if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
436 || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
437 printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n",
438 sb->s_id);
439 sb->s_flags |= MS_RDONLY;
440 }
441 switch (chksum) {
442 case MUFS_FS:
443 case MUFS_INTLFFS:
444 case MUFS_DCFFS:
445 sbi->s_flags |= SF_MUFS;
446 /* fall thru */
447 case FS_INTLFFS:
448 case FS_DCFFS:
449 sbi->s_flags |= SF_INTL;
450 break;
451 case MUFS_FFS:
452 sbi->s_flags |= SF_MUFS;
453 break;
454 case FS_FFS:
455 break;
456 case MUFS_OFS:
457 sbi->s_flags |= SF_MUFS;
458 /* fall thru */
459 case FS_OFS:
460 sbi->s_flags |= SF_OFS;
461 sb->s_flags |= MS_NOEXEC;
462 break;
463 case MUFS_DCOFS:
464 case MUFS_INTLOFS:
465 sbi->s_flags |= SF_MUFS;
466 case FS_DCOFS:
467 case FS_INTLOFS:
468 sbi->s_flags |= SF_INTL | SF_OFS;
469 sb->s_flags |= MS_NOEXEC;
470 break;
471 default:
472 printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n",
473 sb->s_id, chksum);
474 goto out_error;
475 }
476
477 if (mount_flags & SF_VERBOSE) {
478 u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
479 printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
480 len > 31 ? 31 : len,
481 AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
482 sig, sig[3] + '0', blocksize);
483 }
484
485 sb->s_flags |= MS_NODEV | MS_NOSUID;
486
487 sbi->s_data_blksize = sb->s_blocksize;
488 if (sbi->s_flags & SF_OFS)
489 sbi->s_data_blksize -= 24;
490
491 /* Keep super block in cache */
492 sbi->s_root_bh = root_bh;
493 /* N.B. after this point s_root_bh must be released */
494
495 tmp_flags = sb->s_flags;
496 if (affs_init_bitmap(sb, &tmp_flags))
497 goto out_error;
498 sb->s_flags = tmp_flags;
499
500 /* set up enough so that it can read an inode */
501
502 root_inode = affs_iget(sb, root_block);
503 if (IS_ERR(root_inode)) {
504 ret = PTR_ERR(root_inode);
505 goto out_error;
506 }
507
508 if (AFFS_SB(sb)->s_flags & SF_INTL)
509 sb->s_d_op = &affs_intl_dentry_operations;
510 else
511 sb->s_d_op = &affs_dentry_operations;
512
513 sb->s_root = d_make_root(root_inode);
514 if (!sb->s_root) {
515 printk(KERN_ERR "AFFS: Get root inode failed\n");
516 goto out_error;
517 }
518
519 pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
520 return 0;
521
522 /*
523 * Begin the cascaded cleanup ...
524 */
525 out_error:
526 kfree(sbi->s_bitmap);
527 affs_brelse(root_bh);
528 kfree(sbi->s_prefix);
529 kfree(sbi);
530 sb->s_fs_info = NULL;
531 return ret;
532 }
533
534 static int
535 affs_remount(struct super_block *sb, int *flags, char *data)
536 {
537 struct affs_sb_info *sbi = AFFS_SB(sb);
538 int blocksize;
539 kuid_t uid;
540 kgid_t gid;
541 int mode;
542 int reserved;
543 int root_block;
544 unsigned long mount_flags;
545 int res = 0;
546 char *new_opts = kstrdup(data, GFP_KERNEL);
547 char volume[32];
548 char *prefix = NULL;
549
550 pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data);
551
552 *flags |= MS_NODIRATIME;
553
554 memcpy(volume, sbi->s_volume, 32);
555 if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
556 &blocksize, &prefix, volume,
557 &mount_flags)) {
558 kfree(prefix);
559 kfree(new_opts);
560 return -EINVAL;
561 }
562
563 flush_delayed_work(&sbi->sb_work);
564 replace_mount_options(sb, new_opts);
565
566 sbi->s_flags = mount_flags;
567 sbi->s_mode = mode;
568 sbi->s_uid = uid;
569 sbi->s_gid = gid;
570 /* protect against readers */
571 spin_lock(&sbi->symlink_lock);
572 if (prefix) {
573 kfree(sbi->s_prefix);
574 sbi->s_prefix = prefix;
575 }
576 memcpy(sbi->s_volume, volume, 32);
577 spin_unlock(&sbi->symlink_lock);
578
579 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
580 return 0;
581
582 if (*flags & MS_RDONLY)
583 affs_free_bitmap(sb);
584 else
585 res = affs_init_bitmap(sb, flags);
586
587 return res;
588 }
589
590 static int
591 affs_statfs(struct dentry *dentry, struct kstatfs *buf)
592 {
593 struct super_block *sb = dentry->d_sb;
594 int free;
595 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
596
597 pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size,
598 AFFS_SB(sb)->s_reserved);
599
600 free = affs_count_free_blocks(sb);
601 buf->f_type = AFFS_SUPER_MAGIC;
602 buf->f_bsize = sb->s_blocksize;
603 buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
604 buf->f_bfree = free;
605 buf->f_bavail = free;
606 buf->f_fsid.val[0] = (u32)id;
607 buf->f_fsid.val[1] = (u32)(id >> 32);
608 buf->f_namelen = 30;
609 return 0;
610 }
611
612 static struct dentry *affs_mount(struct file_system_type *fs_type,
613 int flags, const char *dev_name, void *data)
614 {
615 return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super);
616 }
617
618 static struct file_system_type affs_fs_type = {
619 .owner = THIS_MODULE,
620 .name = "affs",
621 .mount = affs_mount,
622 .kill_sb = kill_block_super,
623 .fs_flags = FS_REQUIRES_DEV,
624 };
625 MODULE_ALIAS_FS("affs");
626
627 static int __init init_affs_fs(void)
628 {
629 int err = init_inodecache();
630 if (err)
631 goto out1;
632 err = register_filesystem(&affs_fs_type);
633 if (err)
634 goto out;
635 return 0;
636 out:
637 destroy_inodecache();
638 out1:
639 return err;
640 }
641
642 static void __exit exit_affs_fs(void)
643 {
644 unregister_filesystem(&affs_fs_type);
645 destroy_inodecache();
646 }
647
648 MODULE_DESCRIPTION("Amiga filesystem support for Linux");
649 MODULE_LICENSE("GPL");
650
651 module_init(init_affs_fs)
652 module_exit(exit_affs_fs)
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