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initial commit with v2.6.9
[linux-2.6.9-moxart.git] / fs / affs / super.c
blob073e80cbed85d3c470cdeb48bbe23a25a3d73f1a
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/errno.h>
15 #include <linux/fs.h>
16 #include <linux/slab.h>
17 #include <linux/stat.h>
18 #include <linux/time.h>
19 #include <linux/affs_fs.h>
20 #include <linux/kernel.h>
21 #include <linux/mm.h>
22 #include <linux/string.h>
23 #include <linux/genhd.h>
24 #include <linux/amigaffs.h>
25 #include <linux/major.h>
26 #include <linux/blkdev.h>
27 #include <linux/init.h>
28 #include <linux/smp_lock.h>
29 #include <linux/buffer_head.h>
30 #include <linux/vfs.h>
31 #include <linux/parser.h>
32 #include <asm/system.h>
33 #include <asm/uaccess.h>
34
35 extern struct timezone sys_tz;
36
37 static int affs_statfs(struct super_block *sb, struct kstatfs *buf);
38 static int affs_remount (struct super_block *sb, int *flags, char *data);
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 if (!(sb->s_flags & MS_RDONLY)) {
47 AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = cpu_to_be32(1);
48 secs_to_datestamp(get_seconds(),
49 &AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->disk_change);
50 affs_fix_checksum(sb, sbi->s_root_bh);
51 mark_buffer_dirty(sbi->s_root_bh);
52 }
53
54 if (sbi->s_prefix)
55 kfree(sbi->s_prefix);
56 affs_free_bitmap(sb);
57 affs_brelse(sbi->s_root_bh);
58 kfree(sbi);
59 sb->s_fs_info = NULL;
60 return;
61 }
62
63 static void
64 affs_write_super(struct super_block *sb)
65 {
66 int clean = 2;
67 struct affs_sb_info *sbi = AFFS_SB(sb);
68
69 if (!(sb->s_flags & MS_RDONLY)) {
70 // if (sbi->s_bitmap[i].bm_bh) {
71 // if (buffer_dirty(sbi->s_bitmap[i].bm_bh)) {
72 // clean = 0;
73 AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = cpu_to_be32(clean);
74 secs_to_datestamp(get_seconds(),
75 &AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->disk_change);
76 affs_fix_checksum(sb, sbi->s_root_bh);
77 mark_buffer_dirty(sbi->s_root_bh);
78 sb->s_dirt = !clean; /* redo until bitmap synced */
79 } else
80 sb->s_dirt = 0;
81
82 pr_debug("AFFS: write_super() at %lu, clean=%d\n", get_seconds(), clean);
83 }
84
85 static kmem_cache_t * affs_inode_cachep;
86
87 static struct inode *affs_alloc_inode(struct super_block *sb)
88 {
89 struct affs_inode_info *ei;
90 ei = (struct affs_inode_info *)kmem_cache_alloc(affs_inode_cachep, SLAB_KERNEL);
91 if (!ei)
92 return NULL;
93 ei->vfs_inode.i_version = 1;
94 return &ei->vfs_inode;
95 }
96
97 static void affs_destroy_inode(struct inode *inode)
98 {
99 kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
100 }
101
102 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
103 {
104 struct affs_inode_info *ei = (struct affs_inode_info *) foo;
105
106 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
107 SLAB_CTOR_CONSTRUCTOR) {
108 init_MUTEX(&ei->i_link_lock);
109 init_MUTEX(&ei->i_ext_lock);
110 inode_init_once(&ei->vfs_inode);
111 }
112 }
113
114 static int init_inodecache(void)
115 {
116 affs_inode_cachep = kmem_cache_create("affs_inode_cache",
117 sizeof(struct affs_inode_info),
118 0, SLAB_RECLAIM_ACCOUNT,
119 init_once, NULL);
120 if (affs_inode_cachep == NULL)
121 return -ENOMEM;
122 return 0;
123 }
124
125 static void destroy_inodecache(void)
126 {
127 if (kmem_cache_destroy(affs_inode_cachep))
128 printk(KERN_INFO "affs_inode_cache: not all structures were freed\n");
129 }
130
131 static struct super_operations affs_sops = {
132 .alloc_inode = affs_alloc_inode,
133 .destroy_inode = affs_destroy_inode,
134 .read_inode = affs_read_inode,
135 .write_inode = affs_write_inode,
136 .put_inode = affs_put_inode,
137 .delete_inode = affs_delete_inode,
138 .clear_inode = affs_clear_inode,
139 .put_super = affs_put_super,
140 .write_super = affs_write_super,
141 .statfs = affs_statfs,
142 .remount_fs = affs_remount,
143 };
144
145 enum {
146 Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect,
147 Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
148 Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
149 };
150
151 static match_table_t tokens = {
152 {Opt_bs, "bs=%u"},
153 {Opt_mode, "mode=%o"},
154 {Opt_mufs, "mufs"},
155 {Opt_prefix, "prefix=%s"},
156 {Opt_protect, "protect"},
157 {Opt_reserved, "reserved=%u"},
158 {Opt_root, "root=%u"},
159 {Opt_setgid, "setgid=%u"},
160 {Opt_setuid, "setuid=%u"},
161 {Opt_verbose, "verbose"},
162 {Opt_volume, "volume=%s"},
163 {Opt_ignore, "grpquota"},
164 {Opt_ignore, "noquota"},
165 {Opt_ignore, "quota"},
166 {Opt_ignore, "usrquota"},
167 {Opt_err, NULL},
168 };
169
170 static int
171 parse_options(char *options, uid_t *uid, gid_t *gid, int *mode, int *reserved, s32 *root,
172 int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
173 {
174 char *p;
175 substring_t args[MAX_OPT_ARGS];
176
177 /* Fill in defaults */
178
179 *uid = current->uid;
180 *gid = current->gid;
181 *reserved = 2;
182 *root = -1;
183 *blocksize = -1;
184 volume[0] = ':';
185 volume[1] = 0;
186 *mount_opts = 0;
187 if (!options)
188 return 1;
189
190 while ((p = strsep(&options, ",")) != NULL) {
191 int token, n, option;
192 if (!*p)
193 continue;
194
195 token = match_token(p, tokens, args);
196 switch (token) {
197 case Opt_bs:
198 if (match_int(&args[0], &n))
199 return -EINVAL;
200 if (n != 512 && n != 1024 && n != 2048
201 && n != 4096) {
202 printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
203 return 0;
204 }
205 *blocksize = n;
206 break;
207 case Opt_mode:
208 if (match_octal(&args[0], &option))
209 return 1;
210 *mode = option & 0777;
211 *mount_opts |= SF_SETMODE;
212 break;
213 case Opt_mufs:
214 *mount_opts |= SF_MUFS;
215 break;
216 case Opt_prefix:
217 if (*prefix) { /* Free any previous prefix */
218 kfree(*prefix);
219 *prefix = NULL;
220 }
221 *prefix = match_strdup(&args[0]);
222 if (!*prefix)
223 return 0;
224 *mount_opts |= SF_PREFIX;
225 break;
226 case Opt_protect:
227 *mount_opts |= SF_IMMUTABLE;
228 break;
229 case Opt_reserved:
230 if (match_int(&args[0], reserved))
231 return 1;
232 break;
233 case Opt_root:
234 if (match_int(&args[0], root))
235 return 1;
236 break;
237 case Opt_setgid:
238 if (match_int(&args[0], &option))
239 return 1;
240 *gid = option;
241 *mount_opts |= SF_SETGID;
242 break;
243 case Opt_setuid:
244 if (match_int(&args[0], &option))
245 return -EINVAL;
246 *uid = option;
247 *mount_opts |= SF_SETUID;
248 break;
249 case Opt_verbose:
250 *mount_opts |= SF_VERBOSE;
251 break;
252 case Opt_volume: {
253 char *vol = match_strdup(&args[0]);
254 strlcpy(volume, vol, 32);
255 kfree(vol);
256 break;
257 }
258 case Opt_ignore:
259 /* Silently ignore the quota options */
260 break;
261 default:
262 printk("AFFS: Unrecognized mount option \"%s\" "
263 "or missing value\n", p);
264 return 0;
265 }
266 }
267 return 1;
268 }
269
270 /* This function definitely needs to be split up. Some fine day I'll
271 * hopefully have the guts to do so. Until then: sorry for the mess.
272 */
273
274 static int affs_fill_super(struct super_block *sb, void *data, int silent)
275 {
276 struct affs_sb_info *sbi;
277 struct buffer_head *root_bh = NULL;
278 struct buffer_head *boot_bh;
279 struct inode *root_inode = NULL;
280 s32 root_block;
281 int size, blocksize;
282 u32 chksum;
283 int num_bm;
284 int i, j;
285 s32 key;
286 uid_t uid;
287 gid_t gid;
288 int reserved;
289 unsigned long mount_flags;
290 int tmp_flags; /* fix remount prototype... */
291
292 pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");
293
294 sb->s_magic = AFFS_SUPER_MAGIC;
295 sb->s_op = &affs_sops;
296 sb->s_flags |= MS_NODIRATIME;
297
298 sbi = kmalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
299 if (!sbi)
300 return -ENOMEM;
301 sb->s_fs_info = sbi;
302 memset(sbi, 0, sizeof(*sbi));
303 init_MUTEX(&sbi->s_bmlock);
304
305 if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
306 &blocksize,&sbi->s_prefix,
307 sbi->s_volume, &mount_flags)) {
308 printk(KERN_ERR "AFFS: Error parsing options\n");
309 return -EINVAL;
310 }
311 /* N.B. after this point s_prefix must be released */
312
313 sbi->s_flags = mount_flags;
314 sbi->s_mode = i;
315 sbi->s_uid = uid;
316 sbi->s_gid = gid;
317 sbi->s_reserved= reserved;
318
319 /* Get the size of the device in 512-byte blocks.
320 * If we later see that the partition uses bigger
321 * blocks, we will have to change it.
322 */
323
324 size = sb->s_bdev->bd_inode->i_size >> 9;
325 pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size);
326
327 affs_set_blocksize(sb, PAGE_SIZE);
328 /* Try to find root block. Its location depends on the block size. */
329
330 i = 512;
331 j = 4096;
332 if (blocksize > 0) {
333 i = j = blocksize;
334 size = size / (blocksize / 512);
335 }
336 for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
337 sbi->s_root_block = root_block;
338 if (root_block < 0)
339 sbi->s_root_block = (reserved + size - 1) / 2;
340 pr_debug("AFFS: setting blocksize to %d\n", blocksize);
341 affs_set_blocksize(sb, blocksize);
342 sbi->s_partition_size = size;
343
344 /* The root block location that was calculated above is not
345 * correct if the partition size is an odd number of 512-
346 * byte blocks, which will be rounded down to a number of
347 * 1024-byte blocks, and if there were an even number of
348 * reserved blocks. Ideally, all partition checkers should
349 * report the real number of blocks of the real blocksize,
350 * but since this just cannot be done, we have to try to
351 * find the root block anyways. In the above case, it is one
352 * block behind the calculated one. So we check this one, too.
353 */
354 for (num_bm = 0; num_bm < 2; num_bm++) {
355 pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, "
356 "size=%d, reserved=%d\n",
357 sb->s_id,
358 sbi->s_root_block + num_bm,
359 blocksize, size, reserved);
360 root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
361 if (!root_bh)
362 continue;
363 if (!affs_checksum_block(sb, root_bh) &&
364 be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
365 be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
366 sbi->s_hashsize = blocksize / 4 - 56;
367 sbi->s_root_block += num_bm;
368 key = 1;
369 goto got_root;
370 }
371 affs_brelse(root_bh);
372 root_bh = NULL;
373 }
374 }
375 if (!silent)
376 printk(KERN_ERR "AFFS: No valid root block on device %s\n",
377 sb->s_id);
378 goto out_error;
379
380 /* N.B. after this point bh must be released */
381 got_root:
382 root_block = sbi->s_root_block;
383
384 /* Find out which kind of FS we have */
385 boot_bh = sb_bread(sb, 0);
386 if (!boot_bh) {
387 printk(KERN_ERR "AFFS: Cannot read boot block\n");
388 goto out_error;
389 }
390 chksum = be32_to_cpu(*(__be32 *)boot_bh->b_data);
391 brelse(boot_bh);
392
393 /* Dircache filesystems are compatible with non-dircache ones
394 * when reading. As long as they aren't supported, writing is
395 * not recommended.
396 */
397 if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
398 || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
399 printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n",
400 sb->s_id);
401 sb->s_flags |= MS_RDONLY;
402 }
403 switch (chksum) {
404 case MUFS_FS:
405 case MUFS_INTLFFS:
406 case MUFS_DCFFS:
407 sbi->s_flags |= SF_MUFS;
408 /* fall thru */
409 case FS_INTLFFS:
410 case FS_DCFFS:
411 sbi->s_flags |= SF_INTL;
412 break;
413 case MUFS_FFS:
414 sbi->s_flags |= SF_MUFS;
415 break;
416 case FS_FFS:
417 break;
418 case MUFS_OFS:
419 sbi->s_flags |= SF_MUFS;
420 /* fall thru */
421 case FS_OFS:
422 sbi->s_flags |= SF_OFS;
423 sb->s_flags |= MS_NOEXEC;
424 break;
425 case MUFS_DCOFS:
426 case MUFS_INTLOFS:
427 sbi->s_flags |= SF_MUFS;
428 case FS_DCOFS:
429 case FS_INTLOFS:
430 sbi->s_flags |= SF_INTL | SF_OFS;
431 sb->s_flags |= MS_NOEXEC;
432 break;
433 default:
434 printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n",
435 sb->s_id, chksum);
436 goto out_error;
437 }
438
439 if (mount_flags & SF_VERBOSE) {
440 chksum = cpu_to_be32(chksum);
441 printk(KERN_NOTICE "AFFS: Mounting volume \"%*s\": Type=%.3s\\%c, Blocksize=%d\n",
442 AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0],
443 AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
444 (char *)&chksum,((char *)&chksum)[3] + '0',blocksize);
445 }
446
447 sb->s_flags |= MS_NODEV | MS_NOSUID;
448
449 sbi->s_data_blksize = sb->s_blocksize;
450 if (sbi->s_flags & SF_OFS)
451 sbi->s_data_blksize -= 24;
452
453 /* Keep super block in cache */
454 sbi->s_root_bh = root_bh;
455 /* N.B. after this point s_root_bh must be released */
456
457 tmp_flags = sb->s_flags;
458 if (affs_init_bitmap(sb, &tmp_flags))
459 goto out_error;
460 sb->s_flags = tmp_flags;
461
462 /* set up enough so that it can read an inode */
463
464 root_inode = iget(sb, root_block);
465 sb->s_root = d_alloc_root(root_inode);
466 if (!sb->s_root) {
467 printk(KERN_ERR "AFFS: Get root inode failed\n");
468 goto out_error;
469 }
470 sb->s_root->d_op = &affs_dentry_operations;
471
472 pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
473 return 0;
474
475 /*
476 * Begin the cascaded cleanup ...
477 */
478 out_error:
479 if (root_inode)
480 iput(root_inode);
481 if (sbi->s_bitmap)
482 kfree(sbi->s_bitmap);
483 affs_brelse(root_bh);
484 if (sbi->s_prefix)
485 kfree(sbi->s_prefix);
486 kfree(sbi);
487 sb->s_fs_info = NULL;
488 return -EINVAL;
489 }
490
491 static int
492 affs_remount(struct super_block *sb, int *flags, char *data)
493 {
494 struct affs_sb_info *sbi = AFFS_SB(sb);
495 int blocksize;
496 uid_t uid;
497 gid_t gid;
498 int mode;
499 int reserved;
500 int root_block;
501 unsigned long mount_flags;
502 int res = 0;
503
504 pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data);
505
506 *flags |= MS_NODIRATIME;
507
508 if (!parse_options(data,&uid,&gid,&mode,&reserved,&root_block,
509 &blocksize,&sbi->s_prefix,sbi->s_volume,&mount_flags))
510 return -EINVAL;
511 sbi->s_flags = mount_flags;
512 sbi->s_mode = mode;
513 sbi->s_uid = uid;
514 sbi->s_gid = gid;
515
516 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
517 return 0;
518 if (*flags & MS_RDONLY) {
519 sb->s_dirt = 1;
520 while (sb->s_dirt)
521 affs_write_super(sb);
522 affs_free_bitmap(sb);
523 } else
524 res = affs_init_bitmap(sb, flags);
525
526 return res;
527 }
528
529 static int
530 affs_statfs(struct super_block *sb, struct kstatfs *buf)
531 {
532 int free;
533
534 pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size,
535 AFFS_SB(sb)->s_reserved);
536
537 free = affs_count_free_blocks(sb);
538 buf->f_type = AFFS_SUPER_MAGIC;
539 buf->f_bsize = sb->s_blocksize;
540 buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
541 buf->f_bfree = free;
542 buf->f_bavail = free;
543 return 0;
544 }
545
546 static struct super_block *affs_get_sb(struct file_system_type *fs_type,
547 int flags, const char *dev_name, void *data)
548 {
549 return get_sb_bdev(fs_type, flags, dev_name, data, affs_fill_super);
550 }
551
552 static struct file_system_type affs_fs_type = {
553 .owner = THIS_MODULE,
554 .name = "affs",
555 .get_sb = affs_get_sb,
556 .kill_sb = kill_block_super,
557 .fs_flags = FS_REQUIRES_DEV,
558 };
559
560 static int __init init_affs_fs(void)
561 {
562 int err = init_inodecache();
563 if (err)
564 goto out1;
565 err = register_filesystem(&affs_fs_type);
566 if (err)
567 goto out;
568 return 0;
569 out:
570 destroy_inodecache();
571 out1:
572 return err;
573 }
574
575 static void __exit exit_affs_fs(void)
576 {
577 unregister_filesystem(&affs_fs_type);
578 destroy_inodecache();
579 }
580
581 MODULE_DESCRIPTION("Amiga filesystem support for Linux");
582 MODULE_LICENSE("GPL");
583
584 module_init(init_affs_fs)
585 module_exit(exit_affs_fs)
MOXA 2.6.9 from sdlinux-moxaart.tgz