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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> |
337eb00a | 19 | #include <linux/smp_lock.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 CH |
27 | static void |
28 | affs_commit_super(struct super_block *sb, int clean) | |
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); | |
38 | } | |
39 | ||
1da177e4 LT |
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 | ||
6cfd0148 CH |
46 | lock_kernel(); |
47 | ||
e2896436 CH |
48 | if (!(sb->s_flags & MS_RDONLY)) |
49 | affs_commit_super(sb, 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; | |
6cfd0148 CH |
56 | |
57 | unlock_kernel(); | |
1da177e4 LT |
58 | } |
59 | ||
60 | static void | |
61 | affs_write_super(struct super_block *sb) | |
62 | { | |
63 | int clean = 2; | |
1da177e4 | 64 | |
ebc1ac16 | 65 | lock_super(sb); |
1da177e4 LT |
66 | if (!(sb->s_flags & MS_RDONLY)) { |
67 | // if (sbi->s_bitmap[i].bm_bh) { | |
68 | // if (buffer_dirty(sbi->s_bitmap[i].bm_bh)) { | |
69 | // clean = 0; | |
e2896436 | 70 | affs_commit_super(sb, clean); |
1da177e4 LT |
71 | sb->s_dirt = !clean; /* redo until bitmap synced */ |
72 | } else | |
73 | sb->s_dirt = 0; | |
ebc1ac16 | 74 | unlock_super(sb); |
1da177e4 LT |
75 | |
76 | pr_debug("AFFS: write_super() at %lu, clean=%d\n", get_seconds(), clean); | |
77 | } | |
78 | ||
e2896436 CH |
79 | static int |
80 | affs_sync_fs(struct super_block *sb, int wait) | |
81 | { | |
82 | lock_super(sb); | |
83 | affs_commit_super(sb, 2); | |
84 | sb->s_dirt = 0; | |
85 | unlock_super(sb); | |
86 | return 0; | |
87 | } | |
88 | ||
e18b890b | 89 | static struct kmem_cache * affs_inode_cachep; |
1da177e4 LT |
90 | |
91 | static struct inode *affs_alloc_inode(struct super_block *sb) | |
92 | { | |
dca3c336 RZ |
93 | struct affs_inode_info *i; |
94 | ||
95 | i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL); | |
96 | if (!i) | |
1da177e4 | 97 | return NULL; |
dca3c336 RZ |
98 | |
99 | i->vfs_inode.i_version = 1; | |
100 | i->i_lc = NULL; | |
101 | i->i_ext_bh = NULL; | |
102 | i->i_pa_cnt = 0; | |
103 | ||
104 | return &i->vfs_inode; | |
1da177e4 LT |
105 | } |
106 | ||
107 | static void affs_destroy_inode(struct inode *inode) | |
108 | { | |
109 | kmem_cache_free(affs_inode_cachep, AFFS_I(inode)); | |
110 | } | |
111 | ||
51cc5068 | 112 | static void init_once(void *foo) |
1da177e4 LT |
113 | { |
114 | struct affs_inode_info *ei = (struct affs_inode_info *) foo; | |
115 | ||
a35afb83 CL |
116 | init_MUTEX(&ei->i_link_lock); |
117 | init_MUTEX(&ei->i_ext_lock); | |
118 | inode_init_once(&ei->vfs_inode); | |
1da177e4 LT |
119 | } |
120 | ||
121 | static int init_inodecache(void) | |
122 | { | |
123 | affs_inode_cachep = kmem_cache_create("affs_inode_cache", | |
124 | sizeof(struct affs_inode_info), | |
fffb60f9 PJ |
125 | 0, (SLAB_RECLAIM_ACCOUNT| |
126 | SLAB_MEM_SPREAD), | |
20c2df83 | 127 | init_once); |
1da177e4 LT |
128 | if (affs_inode_cachep == NULL) |
129 | return -ENOMEM; | |
130 | return 0; | |
131 | } | |
132 | ||
133 | static void destroy_inodecache(void) | |
134 | { | |
1a1d92c1 | 135 | kmem_cache_destroy(affs_inode_cachep); |
1da177e4 LT |
136 | } |
137 | ||
ee9b6d61 | 138 | static const struct super_operations affs_sops = { |
1da177e4 LT |
139 | .alloc_inode = affs_alloc_inode, |
140 | .destroy_inode = affs_destroy_inode, | |
1da177e4 | 141 | .write_inode = affs_write_inode, |
1da177e4 LT |
142 | .delete_inode = affs_delete_inode, |
143 | .clear_inode = affs_clear_inode, | |
144 | .put_super = affs_put_super, | |
145 | .write_super = affs_write_super, | |
e2896436 | 146 | .sync_fs = affs_sync_fs, |
1da177e4 LT |
147 | .statfs = affs_statfs, |
148 | .remount_fs = affs_remount, | |
e9b3961b | 149 | .show_options = generic_show_options, |
1da177e4 LT |
150 | }; |
151 | ||
152 | enum { | |
153 | Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect, | |
154 | Opt_reserved, Opt_root, Opt_setgid, Opt_setuid, | |
155 | Opt_verbose, Opt_volume, Opt_ignore, Opt_err, | |
156 | }; | |
157 | ||
a447c093 | 158 | static const match_table_t tokens = { |
1da177e4 LT |
159 | {Opt_bs, "bs=%u"}, |
160 | {Opt_mode, "mode=%o"}, | |
161 | {Opt_mufs, "mufs"}, | |
162 | {Opt_prefix, "prefix=%s"}, | |
163 | {Opt_protect, "protect"}, | |
164 | {Opt_reserved, "reserved=%u"}, | |
165 | {Opt_root, "root=%u"}, | |
166 | {Opt_setgid, "setgid=%u"}, | |
167 | {Opt_setuid, "setuid=%u"}, | |
168 | {Opt_verbose, "verbose"}, | |
169 | {Opt_volume, "volume=%s"}, | |
170 | {Opt_ignore, "grpquota"}, | |
171 | {Opt_ignore, "noquota"}, | |
172 | {Opt_ignore, "quota"}, | |
173 | {Opt_ignore, "usrquota"}, | |
174 | {Opt_err, NULL}, | |
175 | }; | |
176 | ||
177 | static int | |
178 | parse_options(char *options, uid_t *uid, gid_t *gid, int *mode, int *reserved, s32 *root, | |
179 | int *blocksize, char **prefix, char *volume, unsigned long *mount_opts) | |
180 | { | |
181 | char *p; | |
182 | substring_t args[MAX_OPT_ARGS]; | |
183 | ||
184 | /* Fill in defaults */ | |
185 | ||
21559981 DH |
186 | *uid = current_uid(); |
187 | *gid = current_gid(); | |
1da177e4 LT |
188 | *reserved = 2; |
189 | *root = -1; | |
190 | *blocksize = -1; | |
191 | volume[0] = ':'; | |
192 | volume[1] = 0; | |
193 | *mount_opts = 0; | |
194 | if (!options) | |
195 | return 1; | |
196 | ||
197 | while ((p = strsep(&options, ",")) != NULL) { | |
198 | int token, n, option; | |
199 | if (!*p) | |
200 | continue; | |
201 | ||
202 | token = match_token(p, tokens, args); | |
203 | switch (token) { | |
204 | case Opt_bs: | |
205 | if (match_int(&args[0], &n)) | |
206 | return -EINVAL; | |
207 | if (n != 512 && n != 1024 && n != 2048 | |
208 | && n != 4096) { | |
209 | printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n"); | |
210 | return 0; | |
211 | } | |
212 | *blocksize = n; | |
213 | break; | |
214 | case Opt_mode: | |
215 | if (match_octal(&args[0], &option)) | |
216 | return 1; | |
217 | *mode = option & 0777; | |
218 | *mount_opts |= SF_SETMODE; | |
219 | break; | |
220 | case Opt_mufs: | |
221 | *mount_opts |= SF_MUFS; | |
222 | break; | |
223 | case Opt_prefix: | |
1da177e4 LT |
224 | *prefix = match_strdup(&args[0]); |
225 | if (!*prefix) | |
226 | return 0; | |
227 | *mount_opts |= SF_PREFIX; | |
228 | break; | |
229 | case Opt_protect: | |
230 | *mount_opts |= SF_IMMUTABLE; | |
231 | break; | |
232 | case Opt_reserved: | |
233 | if (match_int(&args[0], reserved)) | |
234 | return 1; | |
235 | break; | |
236 | case Opt_root: | |
237 | if (match_int(&args[0], root)) | |
238 | return 1; | |
239 | break; | |
240 | case Opt_setgid: | |
241 | if (match_int(&args[0], &option)) | |
242 | return 1; | |
243 | *gid = option; | |
244 | *mount_opts |= SF_SETGID; | |
245 | break; | |
246 | case Opt_setuid: | |
247 | if (match_int(&args[0], &option)) | |
248 | return -EINVAL; | |
249 | *uid = option; | |
250 | *mount_opts |= SF_SETUID; | |
251 | break; | |
252 | case Opt_verbose: | |
253 | *mount_opts |= SF_VERBOSE; | |
254 | break; | |
255 | case Opt_volume: { | |
256 | char *vol = match_strdup(&args[0]); | |
6db27dd9 JM |
257 | if (!vol) |
258 | return 0; | |
1da177e4 LT |
259 | strlcpy(volume, vol, 32); |
260 | kfree(vol); | |
261 | break; | |
262 | } | |
263 | case Opt_ignore: | |
264 | /* Silently ignore the quota options */ | |
265 | break; | |
266 | default: | |
267 | printk("AFFS: Unrecognized mount option \"%s\" " | |
268 | "or missing value\n", p); | |
269 | return 0; | |
270 | } | |
271 | } | |
272 | return 1; | |
273 | } | |
274 | ||
275 | /* This function definitely needs to be split up. Some fine day I'll | |
276 | * hopefully have the guts to do so. Until then: sorry for the mess. | |
277 | */ | |
278 | ||
279 | static int affs_fill_super(struct super_block *sb, void *data, int silent) | |
280 | { | |
281 | struct affs_sb_info *sbi; | |
282 | struct buffer_head *root_bh = NULL; | |
283 | struct buffer_head *boot_bh; | |
284 | struct inode *root_inode = NULL; | |
285 | s32 root_block; | |
286 | int size, blocksize; | |
287 | u32 chksum; | |
288 | int num_bm; | |
289 | int i, j; | |
290 | s32 key; | |
291 | uid_t uid; | |
292 | gid_t gid; | |
293 | int reserved; | |
294 | unsigned long mount_flags; | |
295 | int tmp_flags; /* fix remount prototype... */ | |
2b943cf0 | 296 | u8 sig[4]; |
210f8559 | 297 | int ret = -EINVAL; |
1da177e4 | 298 | |
e9b3961b MS |
299 | save_mount_options(sb, data); |
300 | ||
1da177e4 LT |
301 | pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options"); |
302 | ||
303 | sb->s_magic = AFFS_SUPER_MAGIC; | |
304 | sb->s_op = &affs_sops; | |
305 | sb->s_flags |= MS_NODIRATIME; | |
306 | ||
f8314dc6 | 307 | sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL); |
1da177e4 LT |
308 | if (!sbi) |
309 | return -ENOMEM; | |
310 | sb->s_fs_info = sbi; | |
7d135a5d | 311 | mutex_init(&sbi->s_bmlock); |
29333920 | 312 | spin_lock_init(&sbi->symlink_lock); |
1da177e4 LT |
313 | |
314 | if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block, | |
315 | &blocksize,&sbi->s_prefix, | |
316 | sbi->s_volume, &mount_flags)) { | |
317 | printk(KERN_ERR "AFFS: Error parsing options\n"); | |
afc70ed0 AV |
318 | kfree(sbi->s_prefix); |
319 | kfree(sbi); | |
1da177e4 LT |
320 | return -EINVAL; |
321 | } | |
322 | /* N.B. after this point s_prefix must be released */ | |
323 | ||
324 | sbi->s_flags = mount_flags; | |
325 | sbi->s_mode = i; | |
326 | sbi->s_uid = uid; | |
327 | sbi->s_gid = gid; | |
328 | sbi->s_reserved= reserved; | |
329 | ||
330 | /* Get the size of the device in 512-byte blocks. | |
331 | * If we later see that the partition uses bigger | |
332 | * blocks, we will have to change it. | |
333 | */ | |
334 | ||
335 | size = sb->s_bdev->bd_inode->i_size >> 9; | |
336 | pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size); | |
337 | ||
338 | affs_set_blocksize(sb, PAGE_SIZE); | |
339 | /* Try to find root block. Its location depends on the block size. */ | |
340 | ||
341 | i = 512; | |
342 | j = 4096; | |
343 | if (blocksize > 0) { | |
344 | i = j = blocksize; | |
345 | size = size / (blocksize / 512); | |
346 | } | |
347 | for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) { | |
348 | sbi->s_root_block = root_block; | |
349 | if (root_block < 0) | |
350 | sbi->s_root_block = (reserved + size - 1) / 2; | |
351 | pr_debug("AFFS: setting blocksize to %d\n", blocksize); | |
352 | affs_set_blocksize(sb, blocksize); | |
353 | sbi->s_partition_size = size; | |
354 | ||
355 | /* The root block location that was calculated above is not | |
356 | * correct if the partition size is an odd number of 512- | |
357 | * byte blocks, which will be rounded down to a number of | |
358 | * 1024-byte blocks, and if there were an even number of | |
359 | * reserved blocks. Ideally, all partition checkers should | |
360 | * report the real number of blocks of the real blocksize, | |
361 | * but since this just cannot be done, we have to try to | |
362 | * find the root block anyways. In the above case, it is one | |
363 | * block behind the calculated one. So we check this one, too. | |
364 | */ | |
365 | for (num_bm = 0; num_bm < 2; num_bm++) { | |
366 | pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, " | |
367 | "size=%d, reserved=%d\n", | |
368 | sb->s_id, | |
369 | sbi->s_root_block + num_bm, | |
370 | blocksize, size, reserved); | |
371 | root_bh = affs_bread(sb, sbi->s_root_block + num_bm); | |
372 | if (!root_bh) | |
373 | continue; | |
374 | if (!affs_checksum_block(sb, root_bh) && | |
375 | be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT && | |
376 | be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) { | |
377 | sbi->s_hashsize = blocksize / 4 - 56; | |
378 | sbi->s_root_block += num_bm; | |
379 | key = 1; | |
380 | goto got_root; | |
381 | } | |
382 | affs_brelse(root_bh); | |
383 | root_bh = NULL; | |
384 | } | |
385 | } | |
386 | if (!silent) | |
387 | printk(KERN_ERR "AFFS: No valid root block on device %s\n", | |
388 | sb->s_id); | |
389 | goto out_error; | |
390 | ||
391 | /* N.B. after this point bh must be released */ | |
392 | got_root: | |
393 | root_block = sbi->s_root_block; | |
394 | ||
395 | /* Find out which kind of FS we have */ | |
396 | boot_bh = sb_bread(sb, 0); | |
397 | if (!boot_bh) { | |
398 | printk(KERN_ERR "AFFS: Cannot read boot block\n"); | |
399 | goto out_error; | |
400 | } | |
2b943cf0 | 401 | memcpy(sig, boot_bh->b_data, 4); |
1da177e4 | 402 | brelse(boot_bh); |
2b943cf0 | 403 | chksum = be32_to_cpu(*(__be32 *)sig); |
1da177e4 LT |
404 | |
405 | /* Dircache filesystems are compatible with non-dircache ones | |
406 | * when reading. As long as they aren't supported, writing is | |
407 | * not recommended. | |
408 | */ | |
409 | if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS | |
410 | || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) { | |
411 | printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n", | |
412 | sb->s_id); | |
413 | sb->s_flags |= MS_RDONLY; | |
414 | } | |
415 | switch (chksum) { | |
416 | case MUFS_FS: | |
417 | case MUFS_INTLFFS: | |
418 | case MUFS_DCFFS: | |
419 | sbi->s_flags |= SF_MUFS; | |
420 | /* fall thru */ | |
421 | case FS_INTLFFS: | |
422 | case FS_DCFFS: | |
423 | sbi->s_flags |= SF_INTL; | |
424 | break; | |
425 | case MUFS_FFS: | |
426 | sbi->s_flags |= SF_MUFS; | |
427 | break; | |
428 | case FS_FFS: | |
429 | break; | |
430 | case MUFS_OFS: | |
431 | sbi->s_flags |= SF_MUFS; | |
432 | /* fall thru */ | |
433 | case FS_OFS: | |
434 | sbi->s_flags |= SF_OFS; | |
435 | sb->s_flags |= MS_NOEXEC; | |
436 | break; | |
437 | case MUFS_DCOFS: | |
438 | case MUFS_INTLOFS: | |
439 | sbi->s_flags |= SF_MUFS; | |
440 | case FS_DCOFS: | |
441 | case FS_INTLOFS: | |
442 | sbi->s_flags |= SF_INTL | SF_OFS; | |
443 | sb->s_flags |= MS_NOEXEC; | |
444 | break; | |
445 | default: | |
446 | printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n", | |
447 | sb->s_id, chksum); | |
448 | goto out_error; | |
449 | } | |
450 | ||
451 | if (mount_flags & SF_VERBOSE) { | |
2b943cf0 AV |
452 | u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0]; |
453 | printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n", | |
454 | len > 31 ? 31 : len, | |
1da177e4 | 455 | AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1, |
2b943cf0 | 456 | sig, sig[3] + '0', blocksize); |
1da177e4 LT |
457 | } |
458 | ||
459 | sb->s_flags |= MS_NODEV | MS_NOSUID; | |
460 | ||
461 | sbi->s_data_blksize = sb->s_blocksize; | |
462 | if (sbi->s_flags & SF_OFS) | |
463 | sbi->s_data_blksize -= 24; | |
464 | ||
465 | /* Keep super block in cache */ | |
466 | sbi->s_root_bh = root_bh; | |
467 | /* N.B. after this point s_root_bh must be released */ | |
468 | ||
469 | tmp_flags = sb->s_flags; | |
470 | if (affs_init_bitmap(sb, &tmp_flags)) | |
471 | goto out_error; | |
472 | sb->s_flags = tmp_flags; | |
473 | ||
474 | /* set up enough so that it can read an inode */ | |
475 | ||
210f8559 DH |
476 | root_inode = affs_iget(sb, root_block); |
477 | if (IS_ERR(root_inode)) { | |
478 | ret = PTR_ERR(root_inode); | |
479 | goto out_error_noinode; | |
480 | } | |
481 | ||
1da177e4 LT |
482 | sb->s_root = d_alloc_root(root_inode); |
483 | if (!sb->s_root) { | |
484 | printk(KERN_ERR "AFFS: Get root inode failed\n"); | |
485 | goto out_error; | |
486 | } | |
487 | sb->s_root->d_op = &affs_dentry_operations; | |
488 | ||
489 | pr_debug("AFFS: s_flags=%lX\n",sb->s_flags); | |
490 | return 0; | |
491 | ||
492 | /* | |
493 | * Begin the cascaded cleanup ... | |
494 | */ | |
495 | out_error: | |
496 | if (root_inode) | |
497 | iput(root_inode); | |
210f8559 | 498 | out_error_noinode: |
f99d49ad | 499 | kfree(sbi->s_bitmap); |
1da177e4 | 500 | affs_brelse(root_bh); |
f99d49ad | 501 | kfree(sbi->s_prefix); |
1da177e4 LT |
502 | kfree(sbi); |
503 | sb->s_fs_info = NULL; | |
210f8559 | 504 | return ret; |
1da177e4 LT |
505 | } |
506 | ||
507 | static int | |
508 | affs_remount(struct super_block *sb, int *flags, char *data) | |
509 | { | |
510 | struct affs_sb_info *sbi = AFFS_SB(sb); | |
511 | int blocksize; | |
512 | uid_t uid; | |
513 | gid_t gid; | |
514 | int mode; | |
515 | int reserved; | |
516 | int root_block; | |
517 | unsigned long mount_flags; | |
518 | int res = 0; | |
e9b3961b | 519 | char *new_opts = kstrdup(data, GFP_KERNEL); |
29333920 AV |
520 | char volume[32]; |
521 | char *prefix = NULL; | |
1da177e4 LT |
522 | |
523 | pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data); | |
524 | ||
525 | *flags |= MS_NODIRATIME; | |
526 | ||
29333920 | 527 | memcpy(volume, sbi->s_volume, 32); |
e9b3961b | 528 | if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block, |
29333920 | 529 | &blocksize, &prefix, volume, |
e9b3961b | 530 | &mount_flags)) { |
29333920 | 531 | kfree(prefix); |
e9b3961b | 532 | kfree(new_opts); |
1da177e4 | 533 | return -EINVAL; |
e9b3961b | 534 | } |
337eb00a | 535 | lock_kernel(); |
2a32cebd | 536 | replace_mount_options(sb, new_opts); |
e9b3961b | 537 | |
1da177e4 LT |
538 | sbi->s_flags = mount_flags; |
539 | sbi->s_mode = mode; | |
540 | sbi->s_uid = uid; | |
541 | sbi->s_gid = gid; | |
29333920 AV |
542 | /* protect against readers */ |
543 | spin_lock(&sbi->symlink_lock); | |
544 | if (prefix) { | |
545 | kfree(sbi->s_prefix); | |
546 | sbi->s_prefix = prefix; | |
547 | } | |
548 | memcpy(sbi->s_volume, volume, 32); | |
549 | spin_unlock(&sbi->symlink_lock); | |
1da177e4 | 550 | |
337eb00a AIB |
551 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) { |
552 | unlock_kernel(); | |
1da177e4 | 553 | return 0; |
337eb00a | 554 | } |
1da177e4 LT |
555 | if (*flags & MS_RDONLY) { |
556 | sb->s_dirt = 1; | |
557 | while (sb->s_dirt) | |
558 | affs_write_super(sb); | |
559 | affs_free_bitmap(sb); | |
560 | } else | |
561 | res = affs_init_bitmap(sb, flags); | |
562 | ||
337eb00a | 563 | unlock_kernel(); |
1da177e4 LT |
564 | return res; |
565 | } | |
566 | ||
567 | static int | |
726c3342 | 568 | affs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 569 | { |
726c3342 | 570 | struct super_block *sb = dentry->d_sb; |
1da177e4 | 571 | int free; |
a6a2a73c | 572 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
1da177e4 LT |
573 | |
574 | pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size, | |
575 | AFFS_SB(sb)->s_reserved); | |
576 | ||
577 | free = affs_count_free_blocks(sb); | |
578 | buf->f_type = AFFS_SUPER_MAGIC; | |
579 | buf->f_bsize = sb->s_blocksize; | |
580 | buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved; | |
581 | buf->f_bfree = free; | |
582 | buf->f_bavail = free; | |
a6a2a73c CL |
583 | buf->f_fsid.val[0] = (u32)id; |
584 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
585 | buf->f_namelen = 30; | |
1da177e4 LT |
586 | return 0; |
587 | } | |
588 | ||
454e2398 DH |
589 | static int affs_get_sb(struct file_system_type *fs_type, |
590 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
1da177e4 | 591 | { |
454e2398 DH |
592 | return get_sb_bdev(fs_type, flags, dev_name, data, affs_fill_super, |
593 | mnt); | |
1da177e4 LT |
594 | } |
595 | ||
596 | static struct file_system_type affs_fs_type = { | |
597 | .owner = THIS_MODULE, | |
598 | .name = "affs", | |
599 | .get_sb = affs_get_sb, | |
600 | .kill_sb = kill_block_super, | |
601 | .fs_flags = FS_REQUIRES_DEV, | |
602 | }; | |
603 | ||
604 | static int __init init_affs_fs(void) | |
605 | { | |
606 | int err = init_inodecache(); | |
607 | if (err) | |
608 | goto out1; | |
609 | err = register_filesystem(&affs_fs_type); | |
610 | if (err) | |
611 | goto out; | |
612 | return 0; | |
613 | out: | |
614 | destroy_inodecache(); | |
615 | out1: | |
616 | return err; | |
617 | } | |
618 | ||
619 | static void __exit exit_affs_fs(void) | |
620 | { | |
621 | unregister_filesystem(&affs_fs_type); | |
622 | destroy_inodecache(); | |
623 | } | |
624 | ||
625 | MODULE_DESCRIPTION("Amiga filesystem support for Linux"); | |
626 | MODULE_LICENSE("GPL"); | |
627 | ||
628 | module_init(init_affs_fs) | |
629 | module_exit(exit_affs_fs) |