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Linux 2.6.21
[linux/fpc-iii.git] / fs / affs / super.c
blobc3986a1911b0227e331b03cc2e4018aca282131f
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 "affs.h"
19
20 extern struct timezone sys_tz;
21
22 static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
23 static int affs_remount (struct super_block *sb, int *flags, char *data);
24
25 static void
26 affs_put_super(struct super_block *sb)
27 {
28 struct affs_sb_info *sbi = AFFS_SB(sb);
29 pr_debug("AFFS: put_super()\n");
30
31 if (!(sb->s_flags & MS_RDONLY)) {
32 AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = cpu_to_be32(1);
33 secs_to_datestamp(get_seconds(),
34 &AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->disk_change);
35 affs_fix_checksum(sb, sbi->s_root_bh);
36 mark_buffer_dirty(sbi->s_root_bh);
37 }
38
39 kfree(sbi->s_prefix);
40 affs_free_bitmap(sb);
41 affs_brelse(sbi->s_root_bh);
42 kfree(sbi);
43 sb->s_fs_info = NULL;
44 return;
45 }
46
47 static void
48 affs_write_super(struct super_block *sb)
49 {
50 int clean = 2;
51 struct affs_sb_info *sbi = AFFS_SB(sb);
52
53 if (!(sb->s_flags & MS_RDONLY)) {
54 // if (sbi->s_bitmap[i].bm_bh) {
55 // if (buffer_dirty(sbi->s_bitmap[i].bm_bh)) {
56 // clean = 0;
57 AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = cpu_to_be32(clean);
58 secs_to_datestamp(get_seconds(),
59 &AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->disk_change);
60 affs_fix_checksum(sb, sbi->s_root_bh);
61 mark_buffer_dirty(sbi->s_root_bh);
62 sb->s_dirt = !clean; /* redo until bitmap synced */
63 } else
64 sb->s_dirt = 0;
65
66 pr_debug("AFFS: write_super() at %lu, clean=%d\n", get_seconds(), clean);
67 }
68
69 static struct kmem_cache * affs_inode_cachep;
70
71 static struct inode *affs_alloc_inode(struct super_block *sb)
72 {
73 struct affs_inode_info *ei;
74 ei = (struct affs_inode_info *)kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
75 if (!ei)
76 return NULL;
77 ei->vfs_inode.i_version = 1;
78 return &ei->vfs_inode;
79 }
80
81 static void affs_destroy_inode(struct inode *inode)
82 {
83 kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
84 }
85
86 static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
87 {
88 struct affs_inode_info *ei = (struct affs_inode_info *) foo;
89
90 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
91 SLAB_CTOR_CONSTRUCTOR) {
92 init_MUTEX(&ei->i_link_lock);
93 init_MUTEX(&ei->i_ext_lock);
94 inode_init_once(&ei->vfs_inode);
95 }
96 }
97
98 static int init_inodecache(void)
99 {
100 affs_inode_cachep = kmem_cache_create("affs_inode_cache",
101 sizeof(struct affs_inode_info),
102 0, (SLAB_RECLAIM_ACCOUNT|
103 SLAB_MEM_SPREAD),
104 init_once, NULL);
105 if (affs_inode_cachep == NULL)
106 return -ENOMEM;
107 return 0;
108 }
109
110 static void destroy_inodecache(void)
111 {
112 kmem_cache_destroy(affs_inode_cachep);
113 }
114
115 static const struct super_operations affs_sops = {
116 .alloc_inode = affs_alloc_inode,
117 .destroy_inode = affs_destroy_inode,
118 .read_inode = affs_read_inode,
119 .write_inode = affs_write_inode,
120 .put_inode = affs_put_inode,
121 .drop_inode = affs_drop_inode,
122 .delete_inode = affs_delete_inode,
123 .clear_inode = affs_clear_inode,
124 .put_super = affs_put_super,
125 .write_super = affs_write_super,
126 .statfs = affs_statfs,
127 .remount_fs = affs_remount,
128 };
129
130 enum {
131 Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect,
132 Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
133 Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
134 };
135
136 static match_table_t tokens = {
137 {Opt_bs, "bs=%u"},
138 {Opt_mode, "mode=%o"},
139 {Opt_mufs, "mufs"},
140 {Opt_prefix, "prefix=%s"},
141 {Opt_protect, "protect"},
142 {Opt_reserved, "reserved=%u"},
143 {Opt_root, "root=%u"},
144 {Opt_setgid, "setgid=%u"},
145 {Opt_setuid, "setuid=%u"},
146 {Opt_verbose, "verbose"},
147 {Opt_volume, "volume=%s"},
148 {Opt_ignore, "grpquota"},
149 {Opt_ignore, "noquota"},
150 {Opt_ignore, "quota"},
151 {Opt_ignore, "usrquota"},
152 {Opt_err, NULL},
153 };
154
155 static int
156 parse_options(char *options, uid_t *uid, gid_t *gid, int *mode, int *reserved, s32 *root,
157 int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
158 {
159 char *p;
160 substring_t args[MAX_OPT_ARGS];
161
162 /* Fill in defaults */
163
164 *uid = current->uid;
165 *gid = current->gid;
166 *reserved = 2;
167 *root = -1;
168 *blocksize = -1;
169 volume[0] = ':';
170 volume[1] = 0;
171 *mount_opts = 0;
172 if (!options)
173 return 1;
174
175 while ((p = strsep(&options, ",")) != NULL) {
176 int token, n, option;
177 if (!*p)
178 continue;
179
180 token = match_token(p, tokens, args);
181 switch (token) {
182 case Opt_bs:
183 if (match_int(&args[0], &n))
184 return -EINVAL;
185 if (n != 512 && n != 1024 && n != 2048
186 && n != 4096) {
187 printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
188 return 0;
189 }
190 *blocksize = n;
191 break;
192 case Opt_mode:
193 if (match_octal(&args[0], &option))
194 return 1;
195 *mode = option & 0777;
196 *mount_opts |= SF_SETMODE;
197 break;
198 case Opt_mufs:
199 *mount_opts |= SF_MUFS;
200 break;
201 case Opt_prefix:
202 /* Free any previous prefix */
203 kfree(*prefix);
204 *prefix = NULL;
205 *prefix = match_strdup(&args[0]);
206 if (!*prefix)
207 return 0;
208 *mount_opts |= SF_PREFIX;
209 break;
210 case Opt_protect:
211 *mount_opts |= SF_IMMUTABLE;
212 break;
213 case Opt_reserved:
214 if (match_int(&args[0], reserved))
215 return 1;
216 break;
217 case Opt_root:
218 if (match_int(&args[0], root))
219 return 1;
220 break;
221 case Opt_setgid:
222 if (match_int(&args[0], &option))
223 return 1;
224 *gid = option;
225 *mount_opts |= SF_SETGID;
226 break;
227 case Opt_setuid:
228 if (match_int(&args[0], &option))
229 return -EINVAL;
230 *uid = option;
231 *mount_opts |= SF_SETUID;
232 break;
233 case Opt_verbose:
234 *mount_opts |= SF_VERBOSE;
235 break;
236 case Opt_volume: {
237 char *vol = match_strdup(&args[0]);
238 strlcpy(volume, vol, 32);
239 kfree(vol);
240 break;
241 }
242 case Opt_ignore:
243 /* Silently ignore the quota options */
244 break;
245 default:
246 printk("AFFS: Unrecognized mount option \"%s\" "
247 "or missing value\n", p);
248 return 0;
249 }
250 }
251 return 1;
252 }
253
254 /* This function definitely needs to be split up. Some fine day I'll
255 * hopefully have the guts to do so. Until then: sorry for the mess.
256 */
257
258 static int affs_fill_super(struct super_block *sb, void *data, int silent)
259 {
260 struct affs_sb_info *sbi;
261 struct buffer_head *root_bh = NULL;
262 struct buffer_head *boot_bh;
263 struct inode *root_inode = NULL;
264 s32 root_block;
265 int size, blocksize;
266 u32 chksum;
267 int num_bm;
268 int i, j;
269 s32 key;
270 uid_t uid;
271 gid_t gid;
272 int reserved;
273 unsigned long mount_flags;
274 int tmp_flags; /* fix remount prototype... */
275 u8 sig[4];
276
277 pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");
278
279 sb->s_magic = AFFS_SUPER_MAGIC;
280 sb->s_op = &affs_sops;
281 sb->s_flags |= MS_NODIRATIME;
282
283 sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
284 if (!sbi)
285 return -ENOMEM;
286 sb->s_fs_info = sbi;
287 init_MUTEX(&sbi->s_bmlock);
288
289 if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
290 &blocksize,&sbi->s_prefix,
291 sbi->s_volume, &mount_flags)) {
292 printk(KERN_ERR "AFFS: Error parsing options\n");
293 return -EINVAL;
294 }
295 /* N.B. after this point s_prefix must be released */
296
297 sbi->s_flags = mount_flags;
298 sbi->s_mode = i;
299 sbi->s_uid = uid;
300 sbi->s_gid = gid;
301 sbi->s_reserved= reserved;
302
303 /* Get the size of the device in 512-byte blocks.
304 * If we later see that the partition uses bigger
305 * blocks, we will have to change it.
306 */
307
308 size = sb->s_bdev->bd_inode->i_size >> 9;
309 pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size);
310
311 affs_set_blocksize(sb, PAGE_SIZE);
312 /* Try to find root block. Its location depends on the block size. */
313
314 i = 512;
315 j = 4096;
316 if (blocksize > 0) {
317 i = j = blocksize;
318 size = size / (blocksize / 512);
319 }
320 for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
321 sbi->s_root_block = root_block;
322 if (root_block < 0)
323 sbi->s_root_block = (reserved + size - 1) / 2;
324 pr_debug("AFFS: setting blocksize to %d\n", blocksize);
325 affs_set_blocksize(sb, blocksize);
326 sbi->s_partition_size = size;
327
328 /* The root block location that was calculated above is not
329 * correct if the partition size is an odd number of 512-
330 * byte blocks, which will be rounded down to a number of
331 * 1024-byte blocks, and if there were an even number of
332 * reserved blocks. Ideally, all partition checkers should
333 * report the real number of blocks of the real blocksize,
334 * but since this just cannot be done, we have to try to
335 * find the root block anyways. In the above case, it is one
336 * block behind the calculated one. So we check this one, too.
337 */
338 for (num_bm = 0; num_bm < 2; num_bm++) {
339 pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, "
340 "size=%d, reserved=%d\n",
341 sb->s_id,
342 sbi->s_root_block + num_bm,
343 blocksize, size, reserved);
344 root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
345 if (!root_bh)
346 continue;
347 if (!affs_checksum_block(sb, root_bh) &&
348 be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
349 be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
350 sbi->s_hashsize = blocksize / 4 - 56;
351 sbi->s_root_block += num_bm;
352 key = 1;
353 goto got_root;
354 }
355 affs_brelse(root_bh);
356 root_bh = NULL;
357 }
358 }
359 if (!silent)
360 printk(KERN_ERR "AFFS: No valid root block on device %s\n",
361 sb->s_id);
362 goto out_error;
363
364 /* N.B. after this point bh must be released */
365 got_root:
366 root_block = sbi->s_root_block;
367
368 /* Find out which kind of FS we have */
369 boot_bh = sb_bread(sb, 0);
370 if (!boot_bh) {
371 printk(KERN_ERR "AFFS: Cannot read boot block\n");
372 goto out_error;
373 }
374 memcpy(sig, boot_bh->b_data, 4);
375 brelse(boot_bh);
376 chksum = be32_to_cpu(*(__be32 *)sig);
377
378 /* Dircache filesystems are compatible with non-dircache ones
379 * when reading. As long as they aren't supported, writing is
380 * not recommended.
381 */
382 if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
383 || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
384 printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n",
385 sb->s_id);
386 sb->s_flags |= MS_RDONLY;
387 }
388 switch (chksum) {
389 case MUFS_FS:
390 case MUFS_INTLFFS:
391 case MUFS_DCFFS:
392 sbi->s_flags |= SF_MUFS;
393 /* fall thru */
394 case FS_INTLFFS:
395 case FS_DCFFS:
396 sbi->s_flags |= SF_INTL;
397 break;
398 case MUFS_FFS:
399 sbi->s_flags |= SF_MUFS;
400 break;
401 case FS_FFS:
402 break;
403 case MUFS_OFS:
404 sbi->s_flags |= SF_MUFS;
405 /* fall thru */
406 case FS_OFS:
407 sbi->s_flags |= SF_OFS;
408 sb->s_flags |= MS_NOEXEC;
409 break;
410 case MUFS_DCOFS:
411 case MUFS_INTLOFS:
412 sbi->s_flags |= SF_MUFS;
413 case FS_DCOFS:
414 case FS_INTLOFS:
415 sbi->s_flags |= SF_INTL | SF_OFS;
416 sb->s_flags |= MS_NOEXEC;
417 break;
418 default:
419 printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n",
420 sb->s_id, chksum);
421 goto out_error;
422 }
423
424 if (mount_flags & SF_VERBOSE) {
425 u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
426 printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
427 len > 31 ? 31 : len,
428 AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
429 sig, sig[3] + '0', blocksize);
430 }
431
432 sb->s_flags |= MS_NODEV | MS_NOSUID;
433
434 sbi->s_data_blksize = sb->s_blocksize;
435 if (sbi->s_flags & SF_OFS)
436 sbi->s_data_blksize -= 24;
437
438 /* Keep super block in cache */
439 sbi->s_root_bh = root_bh;
440 /* N.B. after this point s_root_bh must be released */
441
442 tmp_flags = sb->s_flags;
443 if (affs_init_bitmap(sb, &tmp_flags))
444 goto out_error;
445 sb->s_flags = tmp_flags;
446
447 /* set up enough so that it can read an inode */
448
449 root_inode = iget(sb, root_block);
450 sb->s_root = d_alloc_root(root_inode);
451 if (!sb->s_root) {
452 printk(KERN_ERR "AFFS: Get root inode failed\n");
453 goto out_error;
454 }
455 sb->s_root->d_op = &affs_dentry_operations;
456
457 pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
458 return 0;
459
460 /*
461 * Begin the cascaded cleanup ...
462 */
463 out_error:
464 if (root_inode)
465 iput(root_inode);
466 kfree(sbi->s_bitmap);
467 affs_brelse(root_bh);
468 kfree(sbi->s_prefix);
469 kfree(sbi);
470 sb->s_fs_info = NULL;
471 return -EINVAL;
472 }
473
474 static int
475 affs_remount(struct super_block *sb, int *flags, char *data)
476 {
477 struct affs_sb_info *sbi = AFFS_SB(sb);
478 int blocksize;
479 uid_t uid;
480 gid_t gid;
481 int mode;
482 int reserved;
483 int root_block;
484 unsigned long mount_flags;
485 int res = 0;
486
487 pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data);
488
489 *flags |= MS_NODIRATIME;
490
491 if (!parse_options(data,&uid,&gid,&mode,&reserved,&root_block,
492 &blocksize,&sbi->s_prefix,sbi->s_volume,&mount_flags))
493 return -EINVAL;
494 sbi->s_flags = mount_flags;
495 sbi->s_mode = mode;
496 sbi->s_uid = uid;
497 sbi->s_gid = gid;
498
499 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
500 return 0;
501 if (*flags & MS_RDONLY) {
502 sb->s_dirt = 1;
503 while (sb->s_dirt)
504 affs_write_super(sb);
505 affs_free_bitmap(sb);
506 } else
507 res = affs_init_bitmap(sb, flags);
508
509 return res;
510 }
511
512 static int
513 affs_statfs(struct dentry *dentry, struct kstatfs *buf)
514 {
515 struct super_block *sb = dentry->d_sb;
516 int free;
517
518 pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size,
519 AFFS_SB(sb)->s_reserved);
520
521 free = affs_count_free_blocks(sb);
522 buf->f_type = AFFS_SUPER_MAGIC;
523 buf->f_bsize = sb->s_blocksize;
524 buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
525 buf->f_bfree = free;
526 buf->f_bavail = free;
527 return 0;
528 }
529
530 static int affs_get_sb(struct file_system_type *fs_type,
531 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
532 {
533 return get_sb_bdev(fs_type, flags, dev_name, data, affs_fill_super,
534 mnt);
535 }
536
537 static struct file_system_type affs_fs_type = {
538 .owner = THIS_MODULE,
539 .name = "affs",
540 .get_sb = affs_get_sb,
541 .kill_sb = kill_block_super,
542 .fs_flags = FS_REQUIRES_DEV,
543 };
544
545 static int __init init_affs_fs(void)
546 {
547 int err = init_inodecache();
548 if (err)
549 goto out1;
550 err = register_filesystem(&affs_fs_type);
551 if (err)
552 goto out;
553 return 0;
554 out:
555 destroy_inodecache();
556 out1:
557 return err;
558 }
559
560 static void __exit exit_affs_fs(void)
561 {
562 unregister_filesystem(&affs_fs_type);
563 destroy_inodecache();
564 }
565
566 MODULE_DESCRIPTION("Amiga filesystem support for Linux");
567 MODULE_LICENSE("GPL");
568
569 module_init(init_affs_fs)
570 module_exit(exit_affs_fs)
Linux with added FPC-III support