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memstick: init sysfs attributes
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / affs / super.c
blob16a3e4765f68769c80a6d838d39a5b4eb55ce2c6
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 <linux/slab.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 clean)
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 tail->bm_flag = cpu_to_be32(clean);
36 secs_to_datestamp(get_seconds(), &tail->disk_change);
37 affs_fix_checksum(sb, bh);
38 mark_buffer_dirty(bh);
39 }
40
41 static void
42 affs_put_super(struct super_block *sb)
43 {
44 struct affs_sb_info *sbi = AFFS_SB(sb);
45 pr_debug("AFFS: put_super()\n");
46
47 lock_kernel();
48
49 if (!(sb->s_flags & MS_RDONLY))
50 affs_commit_super(sb, 1);
51
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 unlock_kernel();
59 }
60
61 static void
62 affs_write_super(struct super_block *sb)
63 {
64 int clean = 2;
65
66 lock_super(sb);
67 if (!(sb->s_flags & MS_RDONLY)) {
68 // if (sbi->s_bitmap[i].bm_bh) {
69 // if (buffer_dirty(sbi->s_bitmap[i].bm_bh)) {
70 // clean = 0;
71 affs_commit_super(sb, clean);
72 sb->s_dirt = !clean; /* redo until bitmap synced */
73 } else
74 sb->s_dirt = 0;
75 unlock_super(sb);
76
77 pr_debug("AFFS: write_super() at %lu, clean=%d\n", get_seconds(), clean);
78 }
79
80 static int
81 affs_sync_fs(struct super_block *sb, int wait)
82 {
83 lock_super(sb);
84 affs_commit_super(sb, 2);
85 sb->s_dirt = 0;
86 unlock_super(sb);
87 return 0;
88 }
89
90 static struct kmem_cache * affs_inode_cachep;
91
92 static struct inode *affs_alloc_inode(struct super_block *sb)
93 {
94 struct affs_inode_info *i;
95
96 i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
97 if (!i)
98 return NULL;
99
100 i->vfs_inode.i_version = 1;
101 i->i_lc = NULL;
102 i->i_ext_bh = NULL;
103 i->i_pa_cnt = 0;
104
105 return &i->vfs_inode;
106 }
107
108 static void affs_destroy_inode(struct inode *inode)
109 {
110 kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
111 }
112
113 static void init_once(void *foo)
114 {
115 struct affs_inode_info *ei = (struct affs_inode_info *) foo;
116
117 init_MUTEX(&ei->i_link_lock);
118 init_MUTEX(&ei->i_ext_lock);
119 inode_init_once(&ei->vfs_inode);
120 }
121
122 static int init_inodecache(void)
123 {
124 affs_inode_cachep = kmem_cache_create("affs_inode_cache",
125 sizeof(struct affs_inode_info),
126 0, (SLAB_RECLAIM_ACCOUNT|
127 SLAB_MEM_SPREAD),
128 init_once);
129 if (affs_inode_cachep == NULL)
130 return -ENOMEM;
131 return 0;
132 }
133
134 static void destroy_inodecache(void)
135 {
136 kmem_cache_destroy(affs_inode_cachep);
137 }
138
139 static const struct super_operations affs_sops = {
140 .alloc_inode = affs_alloc_inode,
141 .destroy_inode = affs_destroy_inode,
142 .write_inode = affs_write_inode,
143 .delete_inode = affs_delete_inode,
144 .clear_inode = affs_clear_inode,
145 .put_super = affs_put_super,
146 .write_super = affs_write_super,
147 .sync_fs = affs_sync_fs,
148 .statfs = affs_statfs,
149 .remount_fs = affs_remount,
150 .show_options = generic_show_options,
151 };
152
153 enum {
154 Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect,
155 Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
156 Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
157 };
158
159 static const match_table_t tokens = {
160 {Opt_bs, "bs=%u"},
161 {Opt_mode, "mode=%o"},
162 {Opt_mufs, "mufs"},
163 {Opt_prefix, "prefix=%s"},
164 {Opt_protect, "protect"},
165 {Opt_reserved, "reserved=%u"},
166 {Opt_root, "root=%u"},
167 {Opt_setgid, "setgid=%u"},
168 {Opt_setuid, "setuid=%u"},
169 {Opt_verbose, "verbose"},
170 {Opt_volume, "volume=%s"},
171 {Opt_ignore, "grpquota"},
172 {Opt_ignore, "noquota"},
173 {Opt_ignore, "quota"},
174 {Opt_ignore, "usrquota"},
175 {Opt_err, NULL},
176 };
177
178 static int
179 parse_options(char *options, uid_t *uid, gid_t *gid, int *mode, int *reserved, s32 *root,
180 int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
181 {
182 char *p;
183 substring_t args[MAX_OPT_ARGS];
184
185 /* Fill in defaults */
186
187 *uid = current_uid();
188 *gid = current_gid();
189 *reserved = 2;
190 *root = -1;
191 *blocksize = -1;
192 volume[0] = ':';
193 volume[1] = 0;
194 *mount_opts = 0;
195 if (!options)
196 return 1;
197
198 while ((p = strsep(&options, ",")) != NULL) {
199 int token, n, option;
200 if (!*p)
201 continue;
202
203 token = match_token(p, tokens, args);
204 switch (token) {
205 case Opt_bs:
206 if (match_int(&args[0], &n))
207 return 0;
208 if (n != 512 && n != 1024 && n != 2048
209 && n != 4096) {
210 printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
211 return 0;
212 }
213 *blocksize = n;
214 break;
215 case Opt_mode:
216 if (match_octal(&args[0], &option))
217 return 0;
218 *mode = option & 0777;
219 *mount_opts |= SF_SETMODE;
220 break;
221 case Opt_mufs:
222 *mount_opts |= SF_MUFS;
223 break;
224 case Opt_prefix:
225 *prefix = match_strdup(&args[0]);
226 if (!*prefix)
227 return 0;
228 *mount_opts |= SF_PREFIX;
229 break;
230 case Opt_protect:
231 *mount_opts |= SF_IMMUTABLE;
232 break;
233 case Opt_reserved:
234 if (match_int(&args[0], reserved))
235 return 0;
236 break;
237 case Opt_root:
238 if (match_int(&args[0], root))
239 return 0;
240 break;
241 case Opt_setgid:
242 if (match_int(&args[0], &option))
243 return 0;
244 *gid = option;
245 *mount_opts |= SF_SETGID;
246 break;
247 case Opt_setuid:
248 if (match_int(&args[0], &option))
249 return 0;
250 *uid = option;
251 *mount_opts |= SF_SETUID;
252 break;
253 case Opt_verbose:
254 *mount_opts |= SF_VERBOSE;
255 break;
256 case Opt_volume: {
257 char *vol = match_strdup(&args[0]);
258 if (!vol)
259 return 0;
260 strlcpy(volume, vol, 32);
261 kfree(vol);
262 break;
263 }
264 case Opt_ignore:
265 /* Silently ignore the quota options */
266 break;
267 default:
268 printk("AFFS: Unrecognized mount option \"%s\" "
269 "or missing value\n", p);
270 return 0;
271 }
272 }
273 return 1;
274 }
275
276 /* This function definitely needs to be split up. Some fine day I'll
277 * hopefully have the guts to do so. Until then: sorry for the mess.
278 */
279
280 static int affs_fill_super(struct super_block *sb, void *data, int silent)
281 {
282 struct affs_sb_info *sbi;
283 struct buffer_head *root_bh = NULL;
284 struct buffer_head *boot_bh;
285 struct inode *root_inode = NULL;
286 s32 root_block;
287 int size, blocksize;
288 u32 chksum;
289 int num_bm;
290 int i, j;
291 s32 key;
292 uid_t uid;
293 gid_t gid;
294 int reserved;
295 unsigned long mount_flags;
296 int tmp_flags; /* fix remount prototype... */
297 u8 sig[4];
298 int ret = -EINVAL;
299
300 save_mount_options(sb, data);
301
302 pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");
303
304 sb->s_magic = AFFS_SUPER_MAGIC;
305 sb->s_op = &affs_sops;
306 sb->s_flags |= MS_NODIRATIME;
307
308 sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
309 if (!sbi)
310 return -ENOMEM;
311 sb->s_fs_info = sbi;
312 mutex_init(&sbi->s_bmlock);
313 spin_lock_init(&sbi->symlink_lock);
314
315 if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
316 &blocksize,&sbi->s_prefix,
317 sbi->s_volume, &mount_flags)) {
318 printk(KERN_ERR "AFFS: Error parsing options\n");
319 kfree(sbi->s_prefix);
320 kfree(sbi);
321 return -EINVAL;
322 }
323 /* N.B. after this point s_prefix must be released */
324
325 sbi->s_flags = mount_flags;
326 sbi->s_mode = i;
327 sbi->s_uid = uid;
328 sbi->s_gid = gid;
329 sbi->s_reserved= reserved;
330
331 /* Get the size of the device in 512-byte blocks.
332 * If we later see that the partition uses bigger
333 * blocks, we will have to change it.
334 */
335
336 size = sb->s_bdev->bd_inode->i_size >> 9;
337 pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size);
338
339 affs_set_blocksize(sb, PAGE_SIZE);
340 /* Try to find root block. Its location depends on the block size. */
341
342 i = 512;
343 j = 4096;
344 if (blocksize > 0) {
345 i = j = blocksize;
346 size = size / (blocksize / 512);
347 }
348 for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
349 sbi->s_root_block = root_block;
350 if (root_block < 0)
351 sbi->s_root_block = (reserved + size - 1) / 2;
352 pr_debug("AFFS: setting blocksize to %d\n", blocksize);
353 affs_set_blocksize(sb, blocksize);
354 sbi->s_partition_size = size;
355
356 /* The root block location that was calculated above is not
357 * correct if the partition size is an odd number of 512-
358 * byte blocks, which will be rounded down to a number of
359 * 1024-byte blocks, and if there were an even number of
360 * reserved blocks. Ideally, all partition checkers should
361 * report the real number of blocks of the real blocksize,
362 * but since this just cannot be done, we have to try to
363 * find the root block anyways. In the above case, it is one
364 * block behind the calculated one. So we check this one, too.
365 */
366 for (num_bm = 0; num_bm < 2; num_bm++) {
367 pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, "
368 "size=%d, reserved=%d\n",
369 sb->s_id,
370 sbi->s_root_block + num_bm,
371 blocksize, size, reserved);
372 root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
373 if (!root_bh)
374 continue;
375 if (!affs_checksum_block(sb, root_bh) &&
376 be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
377 be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
378 sbi->s_hashsize = blocksize / 4 - 56;
379 sbi->s_root_block += num_bm;
380 key = 1;
381 goto got_root;
382 }
383 affs_brelse(root_bh);
384 root_bh = NULL;
385 }
386 }
387 if (!silent)
388 printk(KERN_ERR "AFFS: No valid root block on device %s\n",
389 sb->s_id);
390 goto out_error;
391
392 /* N.B. after this point bh must be released */
393 got_root:
394 root_block = sbi->s_root_block;
395
396 /* Find out which kind of FS we have */
397 boot_bh = sb_bread(sb, 0);
398 if (!boot_bh) {
399 printk(KERN_ERR "AFFS: Cannot read boot block\n");
400 goto out_error;
401 }
402 memcpy(sig, boot_bh->b_data, 4);
403 brelse(boot_bh);
404 chksum = be32_to_cpu(*(__be32 *)sig);
405
406 /* Dircache filesystems are compatible with non-dircache ones
407 * when reading. As long as they aren't supported, writing is
408 * not recommended.
409 */
410 if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
411 || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
412 printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n",
413 sb->s_id);
414 sb->s_flags |= MS_RDONLY;
415 }
416 switch (chksum) {
417 case MUFS_FS:
418 case MUFS_INTLFFS:
419 case MUFS_DCFFS:
420 sbi->s_flags |= SF_MUFS;
421 /* fall thru */
422 case FS_INTLFFS:
423 case FS_DCFFS:
424 sbi->s_flags |= SF_INTL;
425 break;
426 case MUFS_FFS:
427 sbi->s_flags |= SF_MUFS;
428 break;
429 case FS_FFS:
430 break;
431 case MUFS_OFS:
432 sbi->s_flags |= SF_MUFS;
433 /* fall thru */
434 case FS_OFS:
435 sbi->s_flags |= SF_OFS;
436 sb->s_flags |= MS_NOEXEC;
437 break;
438 case MUFS_DCOFS:
439 case MUFS_INTLOFS:
440 sbi->s_flags |= SF_MUFS;
441 case FS_DCOFS:
442 case FS_INTLOFS:
443 sbi->s_flags |= SF_INTL | SF_OFS;
444 sb->s_flags |= MS_NOEXEC;
445 break;
446 default:
447 printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n",
448 sb->s_id, chksum);
449 goto out_error;
450 }
451
452 if (mount_flags & SF_VERBOSE) {
453 u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
454 printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
455 len > 31 ? 31 : len,
456 AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
457 sig, sig[3] + '0', blocksize);
458 }
459
460 sb->s_flags |= MS_NODEV | MS_NOSUID;
461
462 sbi->s_data_blksize = sb->s_blocksize;
463 if (sbi->s_flags & SF_OFS)
464 sbi->s_data_blksize -= 24;
465
466 /* Keep super block in cache */
467 sbi->s_root_bh = root_bh;
468 /* N.B. after this point s_root_bh must be released */
469
470 tmp_flags = sb->s_flags;
471 if (affs_init_bitmap(sb, &tmp_flags))
472 goto out_error;
473 sb->s_flags = tmp_flags;
474
475 /* set up enough so that it can read an inode */
476
477 root_inode = affs_iget(sb, root_block);
478 if (IS_ERR(root_inode)) {
479 ret = PTR_ERR(root_inode);
480 goto out_error_noinode;
481 }
482
483 sb->s_root = d_alloc_root(root_inode);
484 if (!sb->s_root) {
485 printk(KERN_ERR "AFFS: Get root inode failed\n");
486 goto out_error;
487 }
488 sb->s_root->d_op = &affs_dentry_operations;
489
490 pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
491 return 0;
492
493 /*
494 * Begin the cascaded cleanup ...
495 */
496 out_error:
497 if (root_inode)
498 iput(root_inode);
499 out_error_noinode:
500 kfree(sbi->s_bitmap);
501 affs_brelse(root_bh);
502 kfree(sbi->s_prefix);
503 kfree(sbi);
504 sb->s_fs_info = NULL;
505 return ret;
506 }
507
508 static int
509 affs_remount(struct super_block *sb, int *flags, char *data)
510 {
511 struct affs_sb_info *sbi = AFFS_SB(sb);
512 int blocksize;
513 uid_t uid;
514 gid_t gid;
515 int mode;
516 int reserved;
517 int root_block;
518 unsigned long mount_flags;
519 int res = 0;
520 char *new_opts = kstrdup(data, GFP_KERNEL);
521 char volume[32];
522 char *prefix = NULL;
523
524 pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data);
525
526 *flags |= MS_NODIRATIME;
527
528 memcpy(volume, sbi->s_volume, 32);
529 if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
530 &blocksize, &prefix, volume,
531 &mount_flags)) {
532 kfree(prefix);
533 kfree(new_opts);
534 return -EINVAL;
535 }
536 lock_kernel();
537 replace_mount_options(sb, new_opts);
538
539 sbi->s_flags = mount_flags;
540 sbi->s_mode = mode;
541 sbi->s_uid = uid;
542 sbi->s_gid = gid;
543 /* protect against readers */
544 spin_lock(&sbi->symlink_lock);
545 if (prefix) {
546 kfree(sbi->s_prefix);
547 sbi->s_prefix = prefix;
548 }
549 memcpy(sbi->s_volume, volume, 32);
550 spin_unlock(&sbi->symlink_lock);
551
552 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) {
553 unlock_kernel();
554 return 0;
555 }
556 if (*flags & MS_RDONLY) {
557 sb->s_dirt = 1;
558 while (sb->s_dirt)
559 affs_write_super(sb);
560 affs_free_bitmap(sb);
561 } else
562 res = affs_init_bitmap(sb, flags);
563
564 unlock_kernel();
565 return res;
566 }
567
568 static int
569 affs_statfs(struct dentry *dentry, struct kstatfs *buf)
570 {
571 struct super_block *sb = dentry->d_sb;
572 int free;
573 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
574
575 pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size,
576 AFFS_SB(sb)->s_reserved);
577
578 free = affs_count_free_blocks(sb);
579 buf->f_type = AFFS_SUPER_MAGIC;
580 buf->f_bsize = sb->s_blocksize;
581 buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
582 buf->f_bfree = free;
583 buf->f_bavail = free;
584 buf->f_fsid.val[0] = (u32)id;
585 buf->f_fsid.val[1] = (u32)(id >> 32);
586 buf->f_namelen = 30;
587 return 0;
588 }
589
590 static int affs_get_sb(struct file_system_type *fs_type,
591 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
592 {
593 return get_sb_bdev(fs_type, flags, dev_name, data, affs_fill_super,
594 mnt);
595 }
596
597 static struct file_system_type affs_fs_type = {
598 .owner = THIS_MODULE,
599 .name = "affs",
600 .get_sb = affs_get_sb,
601 .kill_sb = kill_block_super,
602 .fs_flags = FS_REQUIRES_DEV,
603 };
604
605 static int __init init_affs_fs(void)
606 {
607 int err = init_inodecache();
608 if (err)
609 goto out1;
610 err = register_filesystem(&affs_fs_type);
611 if (err)
612 goto out;
613 return 0;
614 out:
615 destroy_inodecache();
616 out1:
617 return err;
618 }
619
620 static void __exit exit_affs_fs(void)
621 {
622 unregister_filesystem(&affs_fs_type);
623 destroy_inodecache();
624 }
625
626 MODULE_DESCRIPTION("Amiga filesystem support for Linux");
627 MODULE_LICENSE("GPL");
628
629 module_init(init_affs_fs)
630 module_exit(exit_affs_fs)
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