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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[pv_ops_mirror.git] / fs / affs / super.c
blobb53e5d0ec65c4b3fd52417dab5c85cdd176ebb76
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 "affs.h"
20
21 extern struct timezone sys_tz;
22
23 static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
24 static int affs_remount (struct super_block *sb, int *flags, char *data);
25
26 static void
27 affs_put_super(struct super_block *sb)
28 {
29 struct affs_sb_info *sbi = AFFS_SB(sb);
30 pr_debug("AFFS: put_super()\n");
31
32 if (!(sb->s_flags & MS_RDONLY)) {
33 AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = cpu_to_be32(1);
34 secs_to_datestamp(get_seconds(),
35 &AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->disk_change);
36 affs_fix_checksum(sb, sbi->s_root_bh);
37 mark_buffer_dirty(sbi->s_root_bh);
38 }
39
40 kfree(sbi->s_prefix);
41 affs_free_bitmap(sb);
42 affs_brelse(sbi->s_root_bh);
43 kfree(sbi);
44 sb->s_fs_info = NULL;
45 return;
46 }
47
48 static void
49 affs_write_super(struct super_block *sb)
50 {
51 int clean = 2;
52 struct affs_sb_info *sbi = AFFS_SB(sb);
53
54 if (!(sb->s_flags & MS_RDONLY)) {
55 // if (sbi->s_bitmap[i].bm_bh) {
56 // if (buffer_dirty(sbi->s_bitmap[i].bm_bh)) {
57 // clean = 0;
58 AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = cpu_to_be32(clean);
59 secs_to_datestamp(get_seconds(),
60 &AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->disk_change);
61 affs_fix_checksum(sb, sbi->s_root_bh);
62 mark_buffer_dirty(sbi->s_root_bh);
63 sb->s_dirt = !clean; /* redo until bitmap synced */
64 } else
65 sb->s_dirt = 0;
66
67 pr_debug("AFFS: write_super() at %lu, clean=%d\n", get_seconds(), clean);
68 }
69
70 static struct kmem_cache * affs_inode_cachep;
71
72 static struct inode *affs_alloc_inode(struct super_block *sb)
73 {
74 struct affs_inode_info *ei;
75 ei = (struct affs_inode_info *)kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
76 if (!ei)
77 return NULL;
78 ei->vfs_inode.i_version = 1;
79 return &ei->vfs_inode;
80 }
81
82 static void affs_destroy_inode(struct inode *inode)
83 {
84 kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
85 }
86
87 static void init_once(struct kmem_cache *cachep, void *foo)
88 {
89 struct affs_inode_info *ei = (struct affs_inode_info *) foo;
90
91 init_MUTEX(&ei->i_link_lock);
92 init_MUTEX(&ei->i_ext_lock);
93 inode_init_once(&ei->vfs_inode);
94 }
95
96 static int init_inodecache(void)
97 {
98 affs_inode_cachep = kmem_cache_create("affs_inode_cache",
99 sizeof(struct affs_inode_info),
100 0, (SLAB_RECLAIM_ACCOUNT|
101 SLAB_MEM_SPREAD),
102 init_once);
103 if (affs_inode_cachep == NULL)
104 return -ENOMEM;
105 return 0;
106 }
107
108 static void destroy_inodecache(void)
109 {
110 kmem_cache_destroy(affs_inode_cachep);
111 }
112
113 static const struct super_operations affs_sops = {
114 .alloc_inode = affs_alloc_inode,
115 .destroy_inode = affs_destroy_inode,
116 .read_inode = affs_read_inode,
117 .write_inode = affs_write_inode,
118 .put_inode = affs_put_inode,
119 .drop_inode = affs_drop_inode,
120 .delete_inode = affs_delete_inode,
121 .clear_inode = affs_clear_inode,
122 .put_super = affs_put_super,
123 .write_super = affs_write_super,
124 .statfs = affs_statfs,
125 .remount_fs = affs_remount,
126 };
127
128 enum {
129 Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect,
130 Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
131 Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
132 };
133
134 static match_table_t tokens = {
135 {Opt_bs, "bs=%u"},
136 {Opt_mode, "mode=%o"},
137 {Opt_mufs, "mufs"},
138 {Opt_prefix, "prefix=%s"},
139 {Opt_protect, "protect"},
140 {Opt_reserved, "reserved=%u"},
141 {Opt_root, "root=%u"},
142 {Opt_setgid, "setgid=%u"},
143 {Opt_setuid, "setuid=%u"},
144 {Opt_verbose, "verbose"},
145 {Opt_volume, "volume=%s"},
146 {Opt_ignore, "grpquota"},
147 {Opt_ignore, "noquota"},
148 {Opt_ignore, "quota"},
149 {Opt_ignore, "usrquota"},
150 {Opt_err, NULL},
151 };
152
153 static int
154 parse_options(char *options, uid_t *uid, gid_t *gid, int *mode, int *reserved, s32 *root,
155 int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
156 {
157 char *p;
158 substring_t args[MAX_OPT_ARGS];
159
160 /* Fill in defaults */
161
162 *uid = current->uid;
163 *gid = current->gid;
164 *reserved = 2;
165 *root = -1;
166 *blocksize = -1;
167 volume[0] = ':';
168 volume[1] = 0;
169 *mount_opts = 0;
170 if (!options)
171 return 1;
172
173 while ((p = strsep(&options, ",")) != NULL) {
174 int token, n, option;
175 if (!*p)
176 continue;
177
178 token = match_token(p, tokens, args);
179 switch (token) {
180 case Opt_bs:
181 if (match_int(&args[0], &n))
182 return -EINVAL;
183 if (n != 512 && n != 1024 && n != 2048
184 && n != 4096) {
185 printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
186 return 0;
187 }
188 *blocksize = n;
189 break;
190 case Opt_mode:
191 if (match_octal(&args[0], &option))
192 return 1;
193 *mode = option & 0777;
194 *mount_opts |= SF_SETMODE;
195 break;
196 case Opt_mufs:
197 *mount_opts |= SF_MUFS;
198 break;
199 case Opt_prefix:
200 /* Free any previous prefix */
201 kfree(*prefix);
202 *prefix = NULL;
203 *prefix = match_strdup(&args[0]);
204 if (!*prefix)
205 return 0;
206 *mount_opts |= SF_PREFIX;
207 break;
208 case Opt_protect:
209 *mount_opts |= SF_IMMUTABLE;
210 break;
211 case Opt_reserved:
212 if (match_int(&args[0], reserved))
213 return 1;
214 break;
215 case Opt_root:
216 if (match_int(&args[0], root))
217 return 1;
218 break;
219 case Opt_setgid:
220 if (match_int(&args[0], &option))
221 return 1;
222 *gid = option;
223 *mount_opts |= SF_SETGID;
224 break;
225 case Opt_setuid:
226 if (match_int(&args[0], &option))
227 return -EINVAL;
228 *uid = option;
229 *mount_opts |= SF_SETUID;
230 break;
231 case Opt_verbose:
232 *mount_opts |= SF_VERBOSE;
233 break;
234 case Opt_volume: {
235 char *vol = match_strdup(&args[0]);
236 strlcpy(volume, vol, 32);
237 kfree(vol);
238 break;
239 }
240 case Opt_ignore:
241 /* Silently ignore the quota options */
242 break;
243 default:
244 printk("AFFS: Unrecognized mount option \"%s\" "
245 "or missing value\n", p);
246 return 0;
247 }
248 }
249 return 1;
250 }
251
252 /* This function definitely needs to be split up. Some fine day I'll
253 * hopefully have the guts to do so. Until then: sorry for the mess.
254 */
255
256 static int affs_fill_super(struct super_block *sb, void *data, int silent)
257 {
258 struct affs_sb_info *sbi;
259 struct buffer_head *root_bh = NULL;
260 struct buffer_head *boot_bh;
261 struct inode *root_inode = NULL;
262 s32 root_block;
263 int size, blocksize;
264 u32 chksum;
265 int num_bm;
266 int i, j;
267 s32 key;
268 uid_t uid;
269 gid_t gid;
270 int reserved;
271 unsigned long mount_flags;
272 int tmp_flags; /* fix remount prototype... */
273 u8 sig[4];
274
275 pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");
276
277 sb->s_magic = AFFS_SUPER_MAGIC;
278 sb->s_op = &affs_sops;
279 sb->s_flags |= MS_NODIRATIME;
280
281 sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
282 if (!sbi)
283 return -ENOMEM;
284 sb->s_fs_info = sbi;
285 init_MUTEX(&sbi->s_bmlock);
286
287 if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
288 &blocksize,&sbi->s_prefix,
289 sbi->s_volume, &mount_flags)) {
290 printk(KERN_ERR "AFFS: Error parsing options\n");
291 return -EINVAL;
292 }
293 /* N.B. after this point s_prefix must be released */
294
295 sbi->s_flags = mount_flags;
296 sbi->s_mode = i;
297 sbi->s_uid = uid;
298 sbi->s_gid = gid;
299 sbi->s_reserved= reserved;
300
301 /* Get the size of the device in 512-byte blocks.
302 * If we later see that the partition uses bigger
303 * blocks, we will have to change it.
304 */
305
306 size = sb->s_bdev->bd_inode->i_size >> 9;
307 pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size);
308
309 affs_set_blocksize(sb, PAGE_SIZE);
310 /* Try to find root block. Its location depends on the block size. */
311
312 i = 512;
313 j = 4096;
314 if (blocksize > 0) {
315 i = j = blocksize;
316 size = size / (blocksize / 512);
317 }
318 for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
319 sbi->s_root_block = root_block;
320 if (root_block < 0)
321 sbi->s_root_block = (reserved + size - 1) / 2;
322 pr_debug("AFFS: setting blocksize to %d\n", blocksize);
323 affs_set_blocksize(sb, blocksize);
324 sbi->s_partition_size = size;
325
326 /* The root block location that was calculated above is not
327 * correct if the partition size is an odd number of 512-
328 * byte blocks, which will be rounded down to a number of
329 * 1024-byte blocks, and if there were an even number of
330 * reserved blocks. Ideally, all partition checkers should
331 * report the real number of blocks of the real blocksize,
332 * but since this just cannot be done, we have to try to
333 * find the root block anyways. In the above case, it is one
334 * block behind the calculated one. So we check this one, too.
335 */
336 for (num_bm = 0; num_bm < 2; num_bm++) {
337 pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, "
338 "size=%d, reserved=%d\n",
339 sb->s_id,
340 sbi->s_root_block + num_bm,
341 blocksize, size, reserved);
342 root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
343 if (!root_bh)
344 continue;
345 if (!affs_checksum_block(sb, root_bh) &&
346 be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
347 be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
348 sbi->s_hashsize = blocksize / 4 - 56;
349 sbi->s_root_block += num_bm;
350 key = 1;
351 goto got_root;
352 }
353 affs_brelse(root_bh);
354 root_bh = NULL;
355 }
356 }
357 if (!silent)
358 printk(KERN_ERR "AFFS: No valid root block on device %s\n",
359 sb->s_id);
360 goto out_error;
361
362 /* N.B. after this point bh must be released */
363 got_root:
364 root_block = sbi->s_root_block;
365
366 /* Find out which kind of FS we have */
367 boot_bh = sb_bread(sb, 0);
368 if (!boot_bh) {
369 printk(KERN_ERR "AFFS: Cannot read boot block\n");
370 goto out_error;
371 }
372 memcpy(sig, boot_bh->b_data, 4);
373 brelse(boot_bh);
374 chksum = be32_to_cpu(*(__be32 *)sig);
375
376 /* Dircache filesystems are compatible with non-dircache ones
377 * when reading. As long as they aren't supported, writing is
378 * not recommended.
379 */
380 if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
381 || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
382 printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n",
383 sb->s_id);
384 sb->s_flags |= MS_RDONLY;
385 }
386 switch (chksum) {
387 case MUFS_FS:
388 case MUFS_INTLFFS:
389 case MUFS_DCFFS:
390 sbi->s_flags |= SF_MUFS;
391 /* fall thru */
392 case FS_INTLFFS:
393 case FS_DCFFS:
394 sbi->s_flags |= SF_INTL;
395 break;
396 case MUFS_FFS:
397 sbi->s_flags |= SF_MUFS;
398 break;
399 case FS_FFS:
400 break;
401 case MUFS_OFS:
402 sbi->s_flags |= SF_MUFS;
403 /* fall thru */
404 case FS_OFS:
405 sbi->s_flags |= SF_OFS;
406 sb->s_flags |= MS_NOEXEC;
407 break;
408 case MUFS_DCOFS:
409 case MUFS_INTLOFS:
410 sbi->s_flags |= SF_MUFS;
411 case FS_DCOFS:
412 case FS_INTLOFS:
413 sbi->s_flags |= SF_INTL | SF_OFS;
414 sb->s_flags |= MS_NOEXEC;
415 break;
416 default:
417 printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n",
418 sb->s_id, chksum);
419 goto out_error;
420 }
421
422 if (mount_flags & SF_VERBOSE) {
423 u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
424 printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
425 len > 31 ? 31 : len,
426 AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
427 sig, sig[3] + '0', blocksize);
428 }
429
430 sb->s_flags |= MS_NODEV | MS_NOSUID;
431
432 sbi->s_data_blksize = sb->s_blocksize;
433 if (sbi->s_flags & SF_OFS)
434 sbi->s_data_blksize -= 24;
435
436 /* Keep super block in cache */
437 sbi->s_root_bh = root_bh;
438 /* N.B. after this point s_root_bh must be released */
439
440 tmp_flags = sb->s_flags;
441 if (affs_init_bitmap(sb, &tmp_flags))
442 goto out_error;
443 sb->s_flags = tmp_flags;
444
445 /* set up enough so that it can read an inode */
446
447 root_inode = iget(sb, root_block);
448 sb->s_root = d_alloc_root(root_inode);
449 if (!sb->s_root) {
450 printk(KERN_ERR "AFFS: Get root inode failed\n");
451 goto out_error;
452 }
453 sb->s_root->d_op = &affs_dentry_operations;
454
455 pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
456 return 0;
457
458 /*
459 * Begin the cascaded cleanup ...
460 */
461 out_error:
462 if (root_inode)
463 iput(root_inode);
464 kfree(sbi->s_bitmap);
465 affs_brelse(root_bh);
466 kfree(sbi->s_prefix);
467 kfree(sbi);
468 sb->s_fs_info = NULL;
469 return -EINVAL;
470 }
471
472 static int
473 affs_remount(struct super_block *sb, int *flags, char *data)
474 {
475 struct affs_sb_info *sbi = AFFS_SB(sb);
476 int blocksize;
477 uid_t uid;
478 gid_t gid;
479 int mode;
480 int reserved;
481 int root_block;
482 unsigned long mount_flags;
483 int res = 0;
484
485 pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data);
486
487 *flags |= MS_NODIRATIME;
488
489 if (!parse_options(data,&uid,&gid,&mode,&reserved,&root_block,
490 &blocksize,&sbi->s_prefix,sbi->s_volume,&mount_flags))
491 return -EINVAL;
492 sbi->s_flags = mount_flags;
493 sbi->s_mode = mode;
494 sbi->s_uid = uid;
495 sbi->s_gid = gid;
496
497 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
498 return 0;
499 if (*flags & MS_RDONLY) {
500 sb->s_dirt = 1;
501 while (sb->s_dirt)
502 affs_write_super(sb);
503 affs_free_bitmap(sb);
504 } else
505 res = affs_init_bitmap(sb, flags);
506
507 return res;
508 }
509
510 static int
511 affs_statfs(struct dentry *dentry, struct kstatfs *buf)
512 {
513 struct super_block *sb = dentry->d_sb;
514 int free;
515
516 pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size,
517 AFFS_SB(sb)->s_reserved);
518
519 free = affs_count_free_blocks(sb);
520 buf->f_type = AFFS_SUPER_MAGIC;
521 buf->f_bsize = sb->s_blocksize;
522 buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
523 buf->f_bfree = free;
524 buf->f_bavail = free;
525 return 0;
526 }
527
528 static int affs_get_sb(struct file_system_type *fs_type,
529 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
530 {
531 return get_sb_bdev(fs_type, flags, dev_name, data, affs_fill_super,
532 mnt);
533 }
534
535 static struct file_system_type affs_fs_type = {
536 .owner = THIS_MODULE,
537 .name = "affs",
538 .get_sb = affs_get_sb,
539 .kill_sb = kill_block_super,
540 .fs_flags = FS_REQUIRES_DEV,
541 };
542
543 static int __init init_affs_fs(void)
544 {
545 int err = init_inodecache();
546 if (err)
547 goto out1;
548 err = register_filesystem(&affs_fs_type);
549 if (err)
550 goto out;
551 return 0;
552 out:
553 destroy_inodecache();
554 out1:
555 return err;
556 }
557
558 static void __exit exit_affs_fs(void)
559 {
560 unregister_filesystem(&affs_fs_type);
561 destroy_inodecache();
562 }
563
564 MODULE_DESCRIPTION("Amiga filesystem support for Linux");
565 MODULE_LICENSE("GPL");
566
567 module_init(init_affs_fs)
568 module_exit(exit_affs_fs)
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