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tree-wide: fix comment/printk typos
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / affs / super.c
blobd41e9673cd9736fae4efb1db81accbeec6c1f7eb
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/smp_lock.h>
20 #include "affs.h"
21
22 extern struct timezone sys_tz;
23
24 static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
25 static int affs_remount (struct super_block *sb, int *flags, char *data);
26
27 static void
28 affs_commit_super(struct super_block *sb, int clean)
29 {
30 struct affs_sb_info *sbi = AFFS_SB(sb);
31 struct buffer_head *bh = sbi->s_root_bh;
32 struct affs_root_tail *tail = AFFS_ROOT_TAIL(sb, bh);
33
34 tail->bm_flag = cpu_to_be32(clean);
35 secs_to_datestamp(get_seconds(), &tail->disk_change);
36 affs_fix_checksum(sb, bh);
37 mark_buffer_dirty(bh);
38 }
39
40 static void
41 affs_put_super(struct super_block *sb)
42 {
43 struct affs_sb_info *sbi = AFFS_SB(sb);
44 pr_debug("AFFS: put_super()\n");
45
46 lock_kernel();
47
48 if (!(sb->s_flags & MS_RDONLY))
49 affs_commit_super(sb, 1);
50
51 kfree(sbi->s_prefix);
52 affs_free_bitmap(sb);
53 affs_brelse(sbi->s_root_bh);
54 kfree(sbi);
55 sb->s_fs_info = NULL;
56
57 unlock_kernel();
58 }
59
60 static void
61 affs_write_super(struct super_block *sb)
62 {
63 int clean = 2;
64
65 lock_super(sb);
66 if (!(sb->s_flags & MS_RDONLY)) {
67 // if (sbi->s_bitmap[i].bm_bh) {
68 // if (buffer_dirty(sbi->s_bitmap[i].bm_bh)) {
69 // clean = 0;
70 affs_commit_super(sb, clean);
71 sb->s_dirt = !clean; /* redo until bitmap synced */
72 } else
73 sb->s_dirt = 0;
74 unlock_super(sb);
75
76 pr_debug("AFFS: write_super() at %lu, clean=%d\n", get_seconds(), clean);
77 }
78
79 static int
80 affs_sync_fs(struct super_block *sb, int wait)
81 {
82 lock_super(sb);
83 affs_commit_super(sb, 2);
84 sb->s_dirt = 0;
85 unlock_super(sb);
86 return 0;
87 }
88
89 static struct kmem_cache * affs_inode_cachep;
90
91 static struct inode *affs_alloc_inode(struct super_block *sb)
92 {
93 struct affs_inode_info *i;
94
95 i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
96 if (!i)
97 return NULL;
98
99 i->vfs_inode.i_version = 1;
100 i->i_lc = NULL;
101 i->i_ext_bh = NULL;
102 i->i_pa_cnt = 0;
103
104 return &i->vfs_inode;
105 }
106
107 static void affs_destroy_inode(struct inode *inode)
108 {
109 kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
110 }
111
112 static void init_once(void *foo)
113 {
114 struct affs_inode_info *ei = (struct affs_inode_info *) foo;
115
116 init_MUTEX(&ei->i_link_lock);
117 init_MUTEX(&ei->i_ext_lock);
118 inode_init_once(&ei->vfs_inode);
119 }
120
121 static int init_inodecache(void)
122 {
123 affs_inode_cachep = kmem_cache_create("affs_inode_cache",
124 sizeof(struct affs_inode_info),
125 0, (SLAB_RECLAIM_ACCOUNT|
126 SLAB_MEM_SPREAD),
127 init_once);
128 if (affs_inode_cachep == NULL)
129 return -ENOMEM;
130 return 0;
131 }
132
133 static void destroy_inodecache(void)
134 {
135 kmem_cache_destroy(affs_inode_cachep);
136 }
137
138 static const struct super_operations affs_sops = {
139 .alloc_inode = affs_alloc_inode,
140 .destroy_inode = affs_destroy_inode,
141 .write_inode = affs_write_inode,
142 .delete_inode = affs_delete_inode,
143 .clear_inode = affs_clear_inode,
144 .put_super = affs_put_super,
145 .write_super = affs_write_super,
146 .sync_fs = affs_sync_fs,
147 .statfs = affs_statfs,
148 .remount_fs = affs_remount,
149 .show_options = generic_show_options,
150 };
151
152 enum {
153 Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect,
154 Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
155 Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
156 };
157
158 static const match_table_t tokens = {
159 {Opt_bs, "bs=%u"},
160 {Opt_mode, "mode=%o"},
161 {Opt_mufs, "mufs"},
162 {Opt_prefix, "prefix=%s"},
163 {Opt_protect, "protect"},
164 {Opt_reserved, "reserved=%u"},
165 {Opt_root, "root=%u"},
166 {Opt_setgid, "setgid=%u"},
167 {Opt_setuid, "setuid=%u"},
168 {Opt_verbose, "verbose"},
169 {Opt_volume, "volume=%s"},
170 {Opt_ignore, "grpquota"},
171 {Opt_ignore, "noquota"},
172 {Opt_ignore, "quota"},
173 {Opt_ignore, "usrquota"},
174 {Opt_err, NULL},
175 };
176
177 static int
178 parse_options(char *options, uid_t *uid, gid_t *gid, int *mode, int *reserved, s32 *root,
179 int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
180 {
181 char *p;
182 substring_t args[MAX_OPT_ARGS];
183
184 /* Fill in defaults */
185
186 *uid = current_uid();
187 *gid = current_gid();
188 *reserved = 2;
189 *root = -1;
190 *blocksize = -1;
191 volume[0] = ':';
192 volume[1] = 0;
193 *mount_opts = 0;
194 if (!options)
195 return 1;
196
197 while ((p = strsep(&options, ",")) != NULL) {
198 int token, n, option;
199 if (!*p)
200 continue;
201
202 token = match_token(p, tokens, args);
203 switch (token) {
204 case Opt_bs:
205 if (match_int(&args[0], &n))
206 return 0;
207 if (n != 512 && n != 1024 && n != 2048
208 && n != 4096) {
209 printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
210 return 0;
211 }
212 *blocksize = n;
213 break;
214 case Opt_mode:
215 if (match_octal(&args[0], &option))
216 return 0;
217 *mode = option & 0777;
218 *mount_opts |= SF_SETMODE;
219 break;
220 case Opt_mufs:
221 *mount_opts |= SF_MUFS;
222 break;
223 case Opt_prefix:
224 *prefix = match_strdup(&args[0]);
225 if (!*prefix)
226 return 0;
227 *mount_opts |= SF_PREFIX;
228 break;
229 case Opt_protect:
230 *mount_opts |= SF_IMMUTABLE;
231 break;
232 case Opt_reserved:
233 if (match_int(&args[0], reserved))
234 return 0;
235 break;
236 case Opt_root:
237 if (match_int(&args[0], root))
238 return 0;
239 break;
240 case Opt_setgid:
241 if (match_int(&args[0], &option))
242 return 0;
243 *gid = option;
244 *mount_opts |= SF_SETGID;
245 break;
246 case Opt_setuid:
247 if (match_int(&args[0], &option))
248 return 0;
249 *uid = option;
250 *mount_opts |= SF_SETUID;
251 break;
252 case Opt_verbose:
253 *mount_opts |= SF_VERBOSE;
254 break;
255 case Opt_volume: {
256 char *vol = match_strdup(&args[0]);
257 if (!vol)
258 return 0;
259 strlcpy(volume, vol, 32);
260 kfree(vol);
261 break;
262 }
263 case Opt_ignore:
264 /* Silently ignore the quota options */
265 break;
266 default:
267 printk("AFFS: Unrecognized mount option \"%s\" "
268 "or missing value\n", p);
269 return 0;
270 }
271 }
272 return 1;
273 }
274
275 /* This function definitely needs to be split up. Some fine day I'll
276 * hopefully have the guts to do so. Until then: sorry for the mess.
277 */
278
279 static int affs_fill_super(struct super_block *sb, void *data, int silent)
280 {
281 struct affs_sb_info *sbi;
282 struct buffer_head *root_bh = NULL;
283 struct buffer_head *boot_bh;
284 struct inode *root_inode = NULL;
285 s32 root_block;
286 int size, blocksize;
287 u32 chksum;
288 int num_bm;
289 int i, j;
290 s32 key;
291 uid_t uid;
292 gid_t gid;
293 int reserved;
294 unsigned long mount_flags;
295 int tmp_flags; /* fix remount prototype... */
296 u8 sig[4];
297 int ret = -EINVAL;
298
299 save_mount_options(sb, data);
300
301 pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");
302
303 sb->s_magic = AFFS_SUPER_MAGIC;
304 sb->s_op = &affs_sops;
305 sb->s_flags |= MS_NODIRATIME;
306
307 sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
308 if (!sbi)
309 return -ENOMEM;
310 sb->s_fs_info = sbi;
311 mutex_init(&sbi->s_bmlock);
312 spin_lock_init(&sbi->symlink_lock);
313
314 if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
315 &blocksize,&sbi->s_prefix,
316 sbi->s_volume, &mount_flags)) {
317 printk(KERN_ERR "AFFS: Error parsing options\n");
318 kfree(sbi->s_prefix);
319 kfree(sbi);
320 return -EINVAL;
321 }
322 /* N.B. after this point s_prefix must be released */
323
324 sbi->s_flags = mount_flags;
325 sbi->s_mode = i;
326 sbi->s_uid = uid;
327 sbi->s_gid = gid;
328 sbi->s_reserved= reserved;
329
330 /* Get the size of the device in 512-byte blocks.
331 * If we later see that the partition uses bigger
332 * blocks, we will have to change it.
333 */
334
335 size = sb->s_bdev->bd_inode->i_size >> 9;
336 pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size);
337
338 affs_set_blocksize(sb, PAGE_SIZE);
339 /* Try to find root block. Its location depends on the block size. */
340
341 i = 512;
342 j = 4096;
343 if (blocksize > 0) {
344 i = j = blocksize;
345 size = size / (blocksize / 512);
346 }
347 for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
348 sbi->s_root_block = root_block;
349 if (root_block < 0)
350 sbi->s_root_block = (reserved + size - 1) / 2;
351 pr_debug("AFFS: setting blocksize to %d\n", blocksize);
352 affs_set_blocksize(sb, blocksize);
353 sbi->s_partition_size = size;
354
355 /* The root block location that was calculated above is not
356 * correct if the partition size is an odd number of 512-
357 * byte blocks, which will be rounded down to a number of
358 * 1024-byte blocks, and if there were an even number of
359 * reserved blocks. Ideally, all partition checkers should
360 * report the real number of blocks of the real blocksize,
361 * but since this just cannot be done, we have to try to
362 * find the root block anyways. In the above case, it is one
363 * block behind the calculated one. So we check this one, too.
364 */
365 for (num_bm = 0; num_bm < 2; num_bm++) {
366 pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, "
367 "size=%d, reserved=%d\n",
368 sb->s_id,
369 sbi->s_root_block + num_bm,
370 blocksize, size, reserved);
371 root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
372 if (!root_bh)
373 continue;
374 if (!affs_checksum_block(sb, root_bh) &&
375 be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
376 be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
377 sbi->s_hashsize = blocksize / 4 - 56;
378 sbi->s_root_block += num_bm;
379 key = 1;
380 goto got_root;
381 }
382 affs_brelse(root_bh);
383 root_bh = NULL;
384 }
385 }
386 if (!silent)
387 printk(KERN_ERR "AFFS: No valid root block on device %s\n",
388 sb->s_id);
389 goto out_error;
390
391 /* N.B. after this point bh must be released */
392 got_root:
393 root_block = sbi->s_root_block;
394
395 /* Find out which kind of FS we have */
396 boot_bh = sb_bread(sb, 0);
397 if (!boot_bh) {
398 printk(KERN_ERR "AFFS: Cannot read boot block\n");
399 goto out_error;
400 }
401 memcpy(sig, boot_bh->b_data, 4);
402 brelse(boot_bh);
403 chksum = be32_to_cpu(*(__be32 *)sig);
404
405 /* Dircache filesystems are compatible with non-dircache ones
406 * when reading. As long as they aren't supported, writing is
407 * not recommended.
408 */
409 if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
410 || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
411 printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n",
412 sb->s_id);
413 sb->s_flags |= MS_RDONLY;
414 }
415 switch (chksum) {
416 case MUFS_FS:
417 case MUFS_INTLFFS:
418 case MUFS_DCFFS:
419 sbi->s_flags |= SF_MUFS;
420 /* fall thru */
421 case FS_INTLFFS:
422 case FS_DCFFS:
423 sbi->s_flags |= SF_INTL;
424 break;
425 case MUFS_FFS:
426 sbi->s_flags |= SF_MUFS;
427 break;
428 case FS_FFS:
429 break;
430 case MUFS_OFS:
431 sbi->s_flags |= SF_MUFS;
432 /* fall thru */
433 case FS_OFS:
434 sbi->s_flags |= SF_OFS;
435 sb->s_flags |= MS_NOEXEC;
436 break;
437 case MUFS_DCOFS:
438 case MUFS_INTLOFS:
439 sbi->s_flags |= SF_MUFS;
440 case FS_DCOFS:
441 case FS_INTLOFS:
442 sbi->s_flags |= SF_INTL | SF_OFS;
443 sb->s_flags |= MS_NOEXEC;
444 break;
445 default:
446 printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n",
447 sb->s_id, chksum);
448 goto out_error;
449 }
450
451 if (mount_flags & SF_VERBOSE) {
452 u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
453 printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
454 len > 31 ? 31 : len,
455 AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
456 sig, sig[3] + '0', blocksize);
457 }
458
459 sb->s_flags |= MS_NODEV | MS_NOSUID;
460
461 sbi->s_data_blksize = sb->s_blocksize;
462 if (sbi->s_flags & SF_OFS)
463 sbi->s_data_blksize -= 24;
464
465 /* Keep super block in cache */
466 sbi->s_root_bh = root_bh;
467 /* N.B. after this point s_root_bh must be released */
468
469 tmp_flags = sb->s_flags;
470 if (affs_init_bitmap(sb, &tmp_flags))
471 goto out_error;
472 sb->s_flags = tmp_flags;
473
474 /* set up enough so that it can read an inode */
475
476 root_inode = affs_iget(sb, root_block);
477 if (IS_ERR(root_inode)) {
478 ret = PTR_ERR(root_inode);
479 goto out_error_noinode;
480 }
481
482 sb->s_root = d_alloc_root(root_inode);
483 if (!sb->s_root) {
484 printk(KERN_ERR "AFFS: Get root inode failed\n");
485 goto out_error;
486 }
487 sb->s_root->d_op = &affs_dentry_operations;
488
489 pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
490 return 0;
491
492 /*
493 * Begin the cascaded cleanup ...
494 */
495 out_error:
496 if (root_inode)
497 iput(root_inode);
498 out_error_noinode:
499 kfree(sbi->s_bitmap);
500 affs_brelse(root_bh);
501 kfree(sbi->s_prefix);
502 kfree(sbi);
503 sb->s_fs_info = NULL;
504 return ret;
505 }
506
507 static int
508 affs_remount(struct super_block *sb, int *flags, char *data)
509 {
510 struct affs_sb_info *sbi = AFFS_SB(sb);
511 int blocksize;
512 uid_t uid;
513 gid_t gid;
514 int mode;
515 int reserved;
516 int root_block;
517 unsigned long mount_flags;
518 int res = 0;
519 char *new_opts = kstrdup(data, GFP_KERNEL);
520 char volume[32];
521 char *prefix = NULL;
522
523 pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data);
524
525 *flags |= MS_NODIRATIME;
526
527 memcpy(volume, sbi->s_volume, 32);
528 if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
529 &blocksize, &prefix, volume,
530 &mount_flags)) {
531 kfree(prefix);
532 kfree(new_opts);
533 return -EINVAL;
534 }
535 lock_kernel();
536 replace_mount_options(sb, new_opts);
537
538 sbi->s_flags = mount_flags;
539 sbi->s_mode = mode;
540 sbi->s_uid = uid;
541 sbi->s_gid = gid;
542 /* protect against readers */
543 spin_lock(&sbi->symlink_lock);
544 if (prefix) {
545 kfree(sbi->s_prefix);
546 sbi->s_prefix = prefix;
547 }
548 memcpy(sbi->s_volume, volume, 32);
549 spin_unlock(&sbi->symlink_lock);
550
551 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) {
552 unlock_kernel();
553 return 0;
554 }
555 if (*flags & MS_RDONLY) {
556 sb->s_dirt = 1;
557 while (sb->s_dirt)
558 affs_write_super(sb);
559 affs_free_bitmap(sb);
560 } else
561 res = affs_init_bitmap(sb, flags);
562
563 unlock_kernel();
564 return res;
565 }
566
567 static int
568 affs_statfs(struct dentry *dentry, struct kstatfs *buf)
569 {
570 struct super_block *sb = dentry->d_sb;
571 int free;
572 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
573
574 pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size,
575 AFFS_SB(sb)->s_reserved);
576
577 free = affs_count_free_blocks(sb);
578 buf->f_type = AFFS_SUPER_MAGIC;
579 buf->f_bsize = sb->s_blocksize;
580 buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
581 buf->f_bfree = free;
582 buf->f_bavail = free;
583 buf->f_fsid.val[0] = (u32)id;
584 buf->f_fsid.val[1] = (u32)(id >> 32);
585 buf->f_namelen = 30;
586 return 0;
587 }
588
589 static int affs_get_sb(struct file_system_type *fs_type,
590 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
591 {
592 return get_sb_bdev(fs_type, flags, dev_name, data, affs_fill_super,
593 mnt);
594 }
595
596 static struct file_system_type affs_fs_type = {
597 .owner = THIS_MODULE,
598 .name = "affs",
599 .get_sb = affs_get_sb,
600 .kill_sb = kill_block_super,
601 .fs_flags = FS_REQUIRES_DEV,
602 };
603
604 static int __init init_affs_fs(void)
605 {
606 int err = init_inodecache();
607 if (err)
608 goto out1;
609 err = register_filesystem(&affs_fs_type);
610 if (err)
611 goto out;
612 return 0;
613 out:
614 destroy_inodecache();
615 out1:
616 return err;
617 }
618
619 static void __exit exit_affs_fs(void)
620 {
621 unregister_filesystem(&affs_fs_type);
622 destroy_inodecache();
623 }
624
625 MODULE_DESCRIPTION("Amiga filesystem support for Linux");
626 MODULE_LICENSE("GPL");
627
628 module_init(init_affs_fs)
629 module_exit(exit_affs_fs)
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