Commit | Line | Data |
---|---|---|
1da177e4 LT |
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> | |
e18fa700 | 17 | #include <linux/magic.h> |
e8edc6e0 | 18 | #include <linux/sched.h> |
5a0e3ad6 | 19 | #include <linux/slab.h> |
1da177e4 LT |
20 | #include "affs.h" |
21 | ||
22 | extern struct timezone sys_tz; | |
23 | ||
726c3342 | 24 | static int affs_statfs(struct dentry *dentry, struct kstatfs *buf); |
1da177e4 LT |
25 | static int affs_remount (struct super_block *sb, int *flags, char *data); |
26 | ||
e2896436 | 27 | static void |
7435d506 | 28 | affs_commit_super(struct super_block *sb, int wait, int clean) |
e2896436 CH |
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); | |
7435d506 AB |
38 | if (wait) |
39 | sync_dirty_buffer(bh); | |
e2896436 CH |
40 | } |
41 | ||
1da177e4 LT |
42 | static void |
43 | affs_put_super(struct super_block *sb) | |
44 | { | |
45 | struct affs_sb_info *sbi = AFFS_SB(sb); | |
46 | pr_debug("AFFS: put_super()\n"); | |
47 | ||
7435d506 AB |
48 | if (!(sb->s_flags & MS_RDONLY) && sb->s_dirt) |
49 | affs_commit_super(sb, 1, 1); | |
1da177e4 | 50 | |
f99d49ad | 51 | kfree(sbi->s_prefix); |
1da177e4 LT |
52 | affs_free_bitmap(sb); |
53 | affs_brelse(sbi->s_root_bh); | |
54 | kfree(sbi); | |
55 | sb->s_fs_info = NULL; | |
1da177e4 LT |
56 | } |
57 | ||
58 | static void | |
59 | affs_write_super(struct super_block *sb) | |
60 | { | |
ebc1ac16 | 61 | lock_super(sb); |
669d5f1f | 62 | if (!(sb->s_flags & MS_RDONLY)) |
7435d506 | 63 | affs_commit_super(sb, 1, 2); |
669d5f1f | 64 | sb->s_dirt = 0; |
ebc1ac16 | 65 | unlock_super(sb); |
1da177e4 | 66 | |
669d5f1f | 67 | pr_debug("AFFS: write_super() at %lu, clean=2\n", get_seconds()); |
1da177e4 LT |
68 | } |
69 | ||
e2896436 CH |
70 | static int |
71 | affs_sync_fs(struct super_block *sb, int wait) | |
72 | { | |
73 | lock_super(sb); | |
7435d506 | 74 | affs_commit_super(sb, wait, 2); |
e2896436 CH |
75 | sb->s_dirt = 0; |
76 | unlock_super(sb); | |
77 | return 0; | |
78 | } | |
79 | ||
e18b890b | 80 | static struct kmem_cache * affs_inode_cachep; |
1da177e4 LT |
81 | |
82 | static struct inode *affs_alloc_inode(struct super_block *sb) | |
83 | { | |
dca3c336 RZ |
84 | struct affs_inode_info *i; |
85 | ||
86 | i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL); | |
87 | if (!i) | |
1da177e4 | 88 | return NULL; |
dca3c336 RZ |
89 | |
90 | i->vfs_inode.i_version = 1; | |
91 | i->i_lc = NULL; | |
92 | i->i_ext_bh = NULL; | |
93 | i->i_pa_cnt = 0; | |
94 | ||
95 | return &i->vfs_inode; | |
1da177e4 LT |
96 | } |
97 | ||
98 | static void affs_destroy_inode(struct inode *inode) | |
99 | { | |
100 | kmem_cache_free(affs_inode_cachep, AFFS_I(inode)); | |
101 | } | |
102 | ||
51cc5068 | 103 | static void init_once(void *foo) |
1da177e4 LT |
104 | { |
105 | struct affs_inode_info *ei = (struct affs_inode_info *) foo; | |
106 | ||
756b0322 TG |
107 | sema_init(&ei->i_link_lock, 1); |
108 | sema_init(&ei->i_ext_lock, 1); | |
a35afb83 | 109 | inode_init_once(&ei->vfs_inode); |
1da177e4 LT |
110 | } |
111 | ||
112 | static int init_inodecache(void) | |
113 | { | |
114 | affs_inode_cachep = kmem_cache_create("affs_inode_cache", | |
115 | sizeof(struct affs_inode_info), | |
fffb60f9 PJ |
116 | 0, (SLAB_RECLAIM_ACCOUNT| |
117 | SLAB_MEM_SPREAD), | |
20c2df83 | 118 | init_once); |
1da177e4 LT |
119 | if (affs_inode_cachep == NULL) |
120 | return -ENOMEM; | |
121 | return 0; | |
122 | } | |
123 | ||
124 | static void destroy_inodecache(void) | |
125 | { | |
1a1d92c1 | 126 | kmem_cache_destroy(affs_inode_cachep); |
1da177e4 LT |
127 | } |
128 | ||
ee9b6d61 | 129 | static const struct super_operations affs_sops = { |
1da177e4 LT |
130 | .alloc_inode = affs_alloc_inode, |
131 | .destroy_inode = affs_destroy_inode, | |
1da177e4 | 132 | .write_inode = affs_write_inode, |
f053ddde | 133 | .evict_inode = affs_evict_inode, |
1da177e4 LT |
134 | .put_super = affs_put_super, |
135 | .write_super = affs_write_super, | |
e2896436 | 136 | .sync_fs = affs_sync_fs, |
1da177e4 LT |
137 | .statfs = affs_statfs, |
138 | .remount_fs = affs_remount, | |
e9b3961b | 139 | .show_options = generic_show_options, |
1da177e4 LT |
140 | }; |
141 | ||
142 | enum { | |
143 | Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect, | |
144 | Opt_reserved, Opt_root, Opt_setgid, Opt_setuid, | |
145 | Opt_verbose, Opt_volume, Opt_ignore, Opt_err, | |
146 | }; | |
147 | ||
a447c093 | 148 | static const match_table_t tokens = { |
1da177e4 LT |
149 | {Opt_bs, "bs=%u"}, |
150 | {Opt_mode, "mode=%o"}, | |
151 | {Opt_mufs, "mufs"}, | |
152 | {Opt_prefix, "prefix=%s"}, | |
153 | {Opt_protect, "protect"}, | |
154 | {Opt_reserved, "reserved=%u"}, | |
155 | {Opt_root, "root=%u"}, | |
156 | {Opt_setgid, "setgid=%u"}, | |
157 | {Opt_setuid, "setuid=%u"}, | |
158 | {Opt_verbose, "verbose"}, | |
159 | {Opt_volume, "volume=%s"}, | |
160 | {Opt_ignore, "grpquota"}, | |
161 | {Opt_ignore, "noquota"}, | |
162 | {Opt_ignore, "quota"}, | |
163 | {Opt_ignore, "usrquota"}, | |
164 | {Opt_err, NULL}, | |
165 | }; | |
166 | ||
167 | static int | |
168 | parse_options(char *options, uid_t *uid, gid_t *gid, int *mode, int *reserved, s32 *root, | |
169 | int *blocksize, char **prefix, char *volume, unsigned long *mount_opts) | |
170 | { | |
171 | char *p; | |
172 | substring_t args[MAX_OPT_ARGS]; | |
173 | ||
174 | /* Fill in defaults */ | |
175 | ||
21559981 DH |
176 | *uid = current_uid(); |
177 | *gid = current_gid(); | |
1da177e4 LT |
178 | *reserved = 2; |
179 | *root = -1; | |
180 | *blocksize = -1; | |
181 | volume[0] = ':'; | |
182 | volume[1] = 0; | |
183 | *mount_opts = 0; | |
184 | if (!options) | |
185 | return 1; | |
186 | ||
187 | while ((p = strsep(&options, ",")) != NULL) { | |
188 | int token, n, option; | |
189 | if (!*p) | |
190 | continue; | |
191 | ||
192 | token = match_token(p, tokens, args); | |
193 | switch (token) { | |
194 | case Opt_bs: | |
195 | if (match_int(&args[0], &n)) | |
217686e9 | 196 | return 0; |
1da177e4 LT |
197 | if (n != 512 && n != 1024 && n != 2048 |
198 | && n != 4096) { | |
199 | printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n"); | |
200 | return 0; | |
201 | } | |
202 | *blocksize = n; | |
203 | break; | |
204 | case Opt_mode: | |
205 | if (match_octal(&args[0], &option)) | |
217686e9 | 206 | return 0; |
1da177e4 LT |
207 | *mode = option & 0777; |
208 | *mount_opts |= SF_SETMODE; | |
209 | break; | |
210 | case Opt_mufs: | |
211 | *mount_opts |= SF_MUFS; | |
212 | break; | |
213 | case Opt_prefix: | |
1da177e4 LT |
214 | *prefix = match_strdup(&args[0]); |
215 | if (!*prefix) | |
216 | return 0; | |
217 | *mount_opts |= SF_PREFIX; | |
218 | break; | |
219 | case Opt_protect: | |
220 | *mount_opts |= SF_IMMUTABLE; | |
221 | break; | |
222 | case Opt_reserved: | |
223 | if (match_int(&args[0], reserved)) | |
217686e9 | 224 | return 0; |
1da177e4 LT |
225 | break; |
226 | case Opt_root: | |
227 | if (match_int(&args[0], root)) | |
217686e9 | 228 | return 0; |
1da177e4 LT |
229 | break; |
230 | case Opt_setgid: | |
231 | if (match_int(&args[0], &option)) | |
217686e9 | 232 | return 0; |
1da177e4 LT |
233 | *gid = option; |
234 | *mount_opts |= SF_SETGID; | |
235 | break; | |
236 | case Opt_setuid: | |
237 | if (match_int(&args[0], &option)) | |
217686e9 | 238 | return 0; |
1da177e4 LT |
239 | *uid = option; |
240 | *mount_opts |= SF_SETUID; | |
241 | break; | |
242 | case Opt_verbose: | |
243 | *mount_opts |= SF_VERBOSE; | |
244 | break; | |
245 | case Opt_volume: { | |
246 | char *vol = match_strdup(&args[0]); | |
6db27dd9 JM |
247 | if (!vol) |
248 | return 0; | |
1da177e4 LT |
249 | strlcpy(volume, vol, 32); |
250 | kfree(vol); | |
251 | break; | |
252 | } | |
253 | case Opt_ignore: | |
254 | /* Silently ignore the quota options */ | |
255 | break; | |
256 | default: | |
257 | printk("AFFS: Unrecognized mount option \"%s\" " | |
258 | "or missing value\n", p); | |
259 | return 0; | |
260 | } | |
261 | } | |
262 | return 1; | |
263 | } | |
264 | ||
265 | /* This function definitely needs to be split up. Some fine day I'll | |
266 | * hopefully have the guts to do so. Until then: sorry for the mess. | |
267 | */ | |
268 | ||
269 | static int affs_fill_super(struct super_block *sb, void *data, int silent) | |
270 | { | |
271 | struct affs_sb_info *sbi; | |
272 | struct buffer_head *root_bh = NULL; | |
273 | struct buffer_head *boot_bh; | |
274 | struct inode *root_inode = NULL; | |
275 | s32 root_block; | |
276 | int size, blocksize; | |
277 | u32 chksum; | |
278 | int num_bm; | |
279 | int i, j; | |
280 | s32 key; | |
281 | uid_t uid; | |
282 | gid_t gid; | |
283 | int reserved; | |
284 | unsigned long mount_flags; | |
285 | int tmp_flags; /* fix remount prototype... */ | |
2b943cf0 | 286 | u8 sig[4]; |
210f8559 | 287 | int ret = -EINVAL; |
1da177e4 | 288 | |
e9b3961b MS |
289 | save_mount_options(sb, data); |
290 | ||
1da177e4 LT |
291 | pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options"); |
292 | ||
293 | sb->s_magic = AFFS_SUPER_MAGIC; | |
294 | sb->s_op = &affs_sops; | |
295 | sb->s_flags |= MS_NODIRATIME; | |
296 | ||
f8314dc6 | 297 | sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL); |
1da177e4 LT |
298 | if (!sbi) |
299 | return -ENOMEM; | |
74c41429 | 300 | |
1da177e4 | 301 | sb->s_fs_info = sbi; |
7d135a5d | 302 | mutex_init(&sbi->s_bmlock); |
29333920 | 303 | spin_lock_init(&sbi->symlink_lock); |
1da177e4 LT |
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"); | |
afc70ed0 AV |
309 | kfree(sbi->s_prefix); |
310 | kfree(sbi); | |
1da177e4 LT |
311 | return -EINVAL; |
312 | } | |
313 | /* N.B. after this point s_prefix must be released */ | |
314 | ||
315 | sbi->s_flags = mount_flags; | |
316 | sbi->s_mode = i; | |
317 | sbi->s_uid = uid; | |
318 | sbi->s_gid = gid; | |
319 | sbi->s_reserved= reserved; | |
320 | ||
321 | /* Get the size of the device in 512-byte blocks. | |
322 | * If we later see that the partition uses bigger | |
323 | * blocks, we will have to change it. | |
324 | */ | |
325 | ||
326 | size = sb->s_bdev->bd_inode->i_size >> 9; | |
327 | pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size); | |
328 | ||
329 | affs_set_blocksize(sb, PAGE_SIZE); | |
330 | /* Try to find root block. Its location depends on the block size. */ | |
331 | ||
332 | i = 512; | |
333 | j = 4096; | |
334 | if (blocksize > 0) { | |
335 | i = j = blocksize; | |
336 | size = size / (blocksize / 512); | |
337 | } | |
338 | for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) { | |
339 | sbi->s_root_block = root_block; | |
340 | if (root_block < 0) | |
341 | sbi->s_root_block = (reserved + size - 1) / 2; | |
342 | pr_debug("AFFS: setting blocksize to %d\n", blocksize); | |
343 | affs_set_blocksize(sb, blocksize); | |
344 | sbi->s_partition_size = size; | |
345 | ||
346 | /* The root block location that was calculated above is not | |
347 | * correct if the partition size is an odd number of 512- | |
348 | * byte blocks, which will be rounded down to a number of | |
349 | * 1024-byte blocks, and if there were an even number of | |
350 | * reserved blocks. Ideally, all partition checkers should | |
351 | * report the real number of blocks of the real blocksize, | |
352 | * but since this just cannot be done, we have to try to | |
353 | * find the root block anyways. In the above case, it is one | |
354 | * block behind the calculated one. So we check this one, too. | |
355 | */ | |
356 | for (num_bm = 0; num_bm < 2; num_bm++) { | |
357 | pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, " | |
358 | "size=%d, reserved=%d\n", | |
359 | sb->s_id, | |
360 | sbi->s_root_block + num_bm, | |
361 | blocksize, size, reserved); | |
362 | root_bh = affs_bread(sb, sbi->s_root_block + num_bm); | |
363 | if (!root_bh) | |
364 | continue; | |
365 | if (!affs_checksum_block(sb, root_bh) && | |
366 | be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT && | |
367 | be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) { | |
368 | sbi->s_hashsize = blocksize / 4 - 56; | |
369 | sbi->s_root_block += num_bm; | |
370 | key = 1; | |
371 | goto got_root; | |
372 | } | |
373 | affs_brelse(root_bh); | |
374 | root_bh = NULL; | |
375 | } | |
376 | } | |
377 | if (!silent) | |
378 | printk(KERN_ERR "AFFS: No valid root block on device %s\n", | |
379 | sb->s_id); | |
380 | goto out_error; | |
381 | ||
382 | /* N.B. after this point bh must be released */ | |
383 | got_root: | |
384 | root_block = sbi->s_root_block; | |
385 | ||
386 | /* Find out which kind of FS we have */ | |
387 | boot_bh = sb_bread(sb, 0); | |
388 | if (!boot_bh) { | |
389 | printk(KERN_ERR "AFFS: Cannot read boot block\n"); | |
390 | goto out_error; | |
391 | } | |
2b943cf0 | 392 | memcpy(sig, boot_bh->b_data, 4); |
1da177e4 | 393 | brelse(boot_bh); |
2b943cf0 | 394 | chksum = be32_to_cpu(*(__be32 *)sig); |
1da177e4 LT |
395 | |
396 | /* Dircache filesystems are compatible with non-dircache ones | |
397 | * when reading. As long as they aren't supported, writing is | |
398 | * not recommended. | |
399 | */ | |
400 | if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS | |
401 | || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) { | |
402 | printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n", | |
403 | sb->s_id); | |
404 | sb->s_flags |= MS_RDONLY; | |
405 | } | |
406 | switch (chksum) { | |
407 | case MUFS_FS: | |
408 | case MUFS_INTLFFS: | |
409 | case MUFS_DCFFS: | |
410 | sbi->s_flags |= SF_MUFS; | |
411 | /* fall thru */ | |
412 | case FS_INTLFFS: | |
413 | case FS_DCFFS: | |
414 | sbi->s_flags |= SF_INTL; | |
415 | break; | |
416 | case MUFS_FFS: | |
417 | sbi->s_flags |= SF_MUFS; | |
418 | break; | |
419 | case FS_FFS: | |
420 | break; | |
421 | case MUFS_OFS: | |
422 | sbi->s_flags |= SF_MUFS; | |
423 | /* fall thru */ | |
424 | case FS_OFS: | |
425 | sbi->s_flags |= SF_OFS; | |
426 | sb->s_flags |= MS_NOEXEC; | |
427 | break; | |
428 | case MUFS_DCOFS: | |
429 | case MUFS_INTLOFS: | |
430 | sbi->s_flags |= SF_MUFS; | |
431 | case FS_DCOFS: | |
432 | case FS_INTLOFS: | |
433 | sbi->s_flags |= SF_INTL | SF_OFS; | |
434 | sb->s_flags |= MS_NOEXEC; | |
435 | break; | |
436 | default: | |
437 | printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n", | |
438 | sb->s_id, chksum); | |
439 | goto out_error; | |
440 | } | |
441 | ||
442 | if (mount_flags & SF_VERBOSE) { | |
2b943cf0 AV |
443 | u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0]; |
444 | printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n", | |
445 | len > 31 ? 31 : len, | |
1da177e4 | 446 | AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1, |
2b943cf0 | 447 | sig, sig[3] + '0', blocksize); |
1da177e4 LT |
448 | } |
449 | ||
450 | sb->s_flags |= MS_NODEV | MS_NOSUID; | |
451 | ||
452 | sbi->s_data_blksize = sb->s_blocksize; | |
453 | if (sbi->s_flags & SF_OFS) | |
454 | sbi->s_data_blksize -= 24; | |
455 | ||
456 | /* Keep super block in cache */ | |
457 | sbi->s_root_bh = root_bh; | |
458 | /* N.B. after this point s_root_bh must be released */ | |
459 | ||
460 | tmp_flags = sb->s_flags; | |
461 | if (affs_init_bitmap(sb, &tmp_flags)) | |
462 | goto out_error; | |
463 | sb->s_flags = tmp_flags; | |
464 | ||
465 | /* set up enough so that it can read an inode */ | |
466 | ||
210f8559 DH |
467 | root_inode = affs_iget(sb, root_block); |
468 | if (IS_ERR(root_inode)) { | |
469 | ret = PTR_ERR(root_inode); | |
470 | goto out_error_noinode; | |
471 | } | |
472 | ||
1da177e4 LT |
473 | sb->s_root = d_alloc_root(root_inode); |
474 | if (!sb->s_root) { | |
475 | printk(KERN_ERR "AFFS: Get root inode failed\n"); | |
476 | goto out_error; | |
477 | } | |
478 | sb->s_root->d_op = &affs_dentry_operations; | |
479 | ||
480 | pr_debug("AFFS: s_flags=%lX\n",sb->s_flags); | |
481 | return 0; | |
482 | ||
483 | /* | |
484 | * Begin the cascaded cleanup ... | |
485 | */ | |
486 | out_error: | |
487 | if (root_inode) | |
488 | iput(root_inode); | |
210f8559 | 489 | out_error_noinode: |
f99d49ad | 490 | kfree(sbi->s_bitmap); |
1da177e4 | 491 | affs_brelse(root_bh); |
f99d49ad | 492 | kfree(sbi->s_prefix); |
1da177e4 LT |
493 | kfree(sbi); |
494 | sb->s_fs_info = NULL; | |
210f8559 | 495 | return ret; |
1da177e4 LT |
496 | } |
497 | ||
498 | static int | |
499 | affs_remount(struct super_block *sb, int *flags, char *data) | |
500 | { | |
501 | struct affs_sb_info *sbi = AFFS_SB(sb); | |
502 | int blocksize; | |
503 | uid_t uid; | |
504 | gid_t gid; | |
505 | int mode; | |
506 | int reserved; | |
507 | int root_block; | |
508 | unsigned long mount_flags; | |
509 | int res = 0; | |
e9b3961b | 510 | char *new_opts = kstrdup(data, GFP_KERNEL); |
29333920 AV |
511 | char volume[32]; |
512 | char *prefix = NULL; | |
1da177e4 LT |
513 | |
514 | pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data); | |
515 | ||
516 | *flags |= MS_NODIRATIME; | |
517 | ||
29333920 | 518 | memcpy(volume, sbi->s_volume, 32); |
e9b3961b | 519 | if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block, |
29333920 | 520 | &blocksize, &prefix, volume, |
e9b3961b | 521 | &mount_flags)) { |
29333920 | 522 | kfree(prefix); |
e9b3961b | 523 | kfree(new_opts); |
1da177e4 | 524 | return -EINVAL; |
e9b3961b | 525 | } |
74c41429 | 526 | |
2a32cebd | 527 | replace_mount_options(sb, new_opts); |
e9b3961b | 528 | |
1da177e4 LT |
529 | sbi->s_flags = mount_flags; |
530 | sbi->s_mode = mode; | |
531 | sbi->s_uid = uid; | |
532 | sbi->s_gid = gid; | |
29333920 AV |
533 | /* protect against readers */ |
534 | spin_lock(&sbi->symlink_lock); | |
535 | if (prefix) { | |
536 | kfree(sbi->s_prefix); | |
537 | sbi->s_prefix = prefix; | |
538 | } | |
539 | memcpy(sbi->s_volume, volume, 32); | |
540 | spin_unlock(&sbi->symlink_lock); | |
1da177e4 | 541 | |
74c41429 | 542 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
1da177e4 | 543 | return 0; |
74c41429 | 544 | |
1da177e4 | 545 | if (*flags & MS_RDONLY) { |
669d5f1f | 546 | affs_write_super(sb); |
1da177e4 LT |
547 | affs_free_bitmap(sb); |
548 | } else | |
549 | res = affs_init_bitmap(sb, flags); | |
550 | ||
551 | return res; | |
552 | } | |
553 | ||
554 | static int | |
726c3342 | 555 | affs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 556 | { |
726c3342 | 557 | struct super_block *sb = dentry->d_sb; |
1da177e4 | 558 | int free; |
a6a2a73c | 559 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
1da177e4 LT |
560 | |
561 | pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size, | |
562 | AFFS_SB(sb)->s_reserved); | |
563 | ||
564 | free = affs_count_free_blocks(sb); | |
565 | buf->f_type = AFFS_SUPER_MAGIC; | |
566 | buf->f_bsize = sb->s_blocksize; | |
567 | buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved; | |
568 | buf->f_bfree = free; | |
569 | buf->f_bavail = free; | |
a6a2a73c CL |
570 | buf->f_fsid.val[0] = (u32)id; |
571 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
572 | buf->f_namelen = 30; | |
1da177e4 LT |
573 | return 0; |
574 | } | |
575 | ||
152a0836 AV |
576 | static struct dentry *affs_mount(struct file_system_type *fs_type, |
577 | int flags, const char *dev_name, void *data) | |
1da177e4 | 578 | { |
152a0836 | 579 | return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super); |
1da177e4 LT |
580 | } |
581 | ||
582 | static struct file_system_type affs_fs_type = { | |
583 | .owner = THIS_MODULE, | |
584 | .name = "affs", | |
152a0836 | 585 | .mount = affs_mount, |
1da177e4 LT |
586 | .kill_sb = kill_block_super, |
587 | .fs_flags = FS_REQUIRES_DEV, | |
588 | }; | |
589 | ||
590 | static int __init init_affs_fs(void) | |
591 | { | |
592 | int err = init_inodecache(); | |
593 | if (err) | |
594 | goto out1; | |
595 | err = register_filesystem(&affs_fs_type); | |
596 | if (err) | |
597 | goto out; | |
598 | return 0; | |
599 | out: | |
600 | destroy_inodecache(); | |
601 | out1: | |
602 | return err; | |
603 | } | |
604 | ||
605 | static void __exit exit_affs_fs(void) | |
606 | { | |
607 | unregister_filesystem(&affs_fs_type); | |
608 | destroy_inodecache(); | |
609 | } | |
610 | ||
611 | MODULE_DESCRIPTION("Amiga filesystem support for Linux"); | |
612 | MODULE_LICENSE("GPL"); | |
613 | ||
614 | module_init(init_affs_fs) | |
615 | module_exit(exit_affs_fs) |