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 |
bc86256d | 28 | affs_commit_super(struct super_block *sb, int wait) |
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 | ||
e0471c8d | 34 | lock_super(sb); |
e2896436 CH |
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); | |
e0471c8d | 40 | unlock_super(sb); |
e2896436 CH |
41 | } |
42 | ||
1da177e4 LT |
43 | static void |
44 | affs_put_super(struct super_block *sb) | |
45 | { | |
46 | struct affs_sb_info *sbi = AFFS_SB(sb); | |
47 | pr_debug("AFFS: put_super()\n"); | |
48 | ||
f99d49ad | 49 | kfree(sbi->s_prefix); |
1da177e4 LT |
50 | affs_free_bitmap(sb); |
51 | affs_brelse(sbi->s_root_bh); | |
52 | kfree(sbi); | |
53 | sb->s_fs_info = NULL; | |
1da177e4 LT |
54 | } |
55 | ||
56 | static void | |
57 | affs_write_super(struct super_block *sb) | |
58 | { | |
669d5f1f | 59 | if (!(sb->s_flags & MS_RDONLY)) |
bc86256d | 60 | affs_commit_super(sb, 1); |
669d5f1f | 61 | sb->s_dirt = 0; |
669d5f1f | 62 | pr_debug("AFFS: write_super() at %lu, clean=2\n", get_seconds()); |
1da177e4 LT |
63 | } |
64 | ||
e2896436 CH |
65 | static int |
66 | affs_sync_fs(struct super_block *sb, int wait) | |
67 | { | |
bc86256d | 68 | affs_commit_super(sb, wait); |
e2896436 | 69 | sb->s_dirt = 0; |
e2896436 CH |
70 | return 0; |
71 | } | |
72 | ||
e18b890b | 73 | static struct kmem_cache * affs_inode_cachep; |
1da177e4 LT |
74 | |
75 | static struct inode *affs_alloc_inode(struct super_block *sb) | |
76 | { | |
dca3c336 RZ |
77 | struct affs_inode_info *i; |
78 | ||
79 | i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL); | |
80 | if (!i) | |
1da177e4 | 81 | return NULL; |
dca3c336 RZ |
82 | |
83 | i->vfs_inode.i_version = 1; | |
84 | i->i_lc = NULL; | |
85 | i->i_ext_bh = NULL; | |
86 | i->i_pa_cnt = 0; | |
87 | ||
88 | return &i->vfs_inode; | |
1da177e4 LT |
89 | } |
90 | ||
fa0d7e3d | 91 | static void affs_i_callback(struct rcu_head *head) |
1da177e4 | 92 | { |
fa0d7e3d | 93 | struct inode *inode = container_of(head, struct inode, i_rcu); |
1da177e4 LT |
94 | kmem_cache_free(affs_inode_cachep, AFFS_I(inode)); |
95 | } | |
96 | ||
fa0d7e3d NP |
97 | static void affs_destroy_inode(struct inode *inode) |
98 | { | |
99 | call_rcu(&inode->i_rcu, affs_i_callback); | |
100 | } | |
101 | ||
51cc5068 | 102 | static void init_once(void *foo) |
1da177e4 LT |
103 | { |
104 | struct affs_inode_info *ei = (struct affs_inode_info *) foo; | |
105 | ||
756b0322 TG |
106 | sema_init(&ei->i_link_lock, 1); |
107 | sema_init(&ei->i_ext_lock, 1); | |
a35afb83 | 108 | inode_init_once(&ei->vfs_inode); |
1da177e4 LT |
109 | } |
110 | ||
111 | static int init_inodecache(void) | |
112 | { | |
113 | affs_inode_cachep = kmem_cache_create("affs_inode_cache", | |
114 | sizeof(struct affs_inode_info), | |
fffb60f9 PJ |
115 | 0, (SLAB_RECLAIM_ACCOUNT| |
116 | SLAB_MEM_SPREAD), | |
20c2df83 | 117 | init_once); |
1da177e4 LT |
118 | if (affs_inode_cachep == NULL) |
119 | return -ENOMEM; | |
120 | return 0; | |
121 | } | |
122 | ||
123 | static void destroy_inodecache(void) | |
124 | { | |
1a1d92c1 | 125 | kmem_cache_destroy(affs_inode_cachep); |
1da177e4 LT |
126 | } |
127 | ||
ee9b6d61 | 128 | static const struct super_operations affs_sops = { |
1da177e4 LT |
129 | .alloc_inode = affs_alloc_inode, |
130 | .destroy_inode = affs_destroy_inode, | |
1da177e4 | 131 | .write_inode = affs_write_inode, |
f053ddde | 132 | .evict_inode = affs_evict_inode, |
1da177e4 LT |
133 | .put_super = affs_put_super, |
134 | .write_super = affs_write_super, | |
e2896436 | 135 | .sync_fs = affs_sync_fs, |
1da177e4 LT |
136 | .statfs = affs_statfs, |
137 | .remount_fs = affs_remount, | |
e9b3961b | 138 | .show_options = generic_show_options, |
1da177e4 LT |
139 | }; |
140 | ||
141 | enum { | |
142 | Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect, | |
143 | Opt_reserved, Opt_root, Opt_setgid, Opt_setuid, | |
144 | Opt_verbose, Opt_volume, Opt_ignore, Opt_err, | |
145 | }; | |
146 | ||
a447c093 | 147 | static const match_table_t tokens = { |
1da177e4 LT |
148 | {Opt_bs, "bs=%u"}, |
149 | {Opt_mode, "mode=%o"}, | |
150 | {Opt_mufs, "mufs"}, | |
151 | {Opt_prefix, "prefix=%s"}, | |
152 | {Opt_protect, "protect"}, | |
153 | {Opt_reserved, "reserved=%u"}, | |
154 | {Opt_root, "root=%u"}, | |
155 | {Opt_setgid, "setgid=%u"}, | |
156 | {Opt_setuid, "setuid=%u"}, | |
157 | {Opt_verbose, "verbose"}, | |
158 | {Opt_volume, "volume=%s"}, | |
159 | {Opt_ignore, "grpquota"}, | |
160 | {Opt_ignore, "noquota"}, | |
161 | {Opt_ignore, "quota"}, | |
162 | {Opt_ignore, "usrquota"}, | |
163 | {Opt_err, NULL}, | |
164 | }; | |
165 | ||
166 | static int | |
167 | parse_options(char *options, uid_t *uid, gid_t *gid, int *mode, int *reserved, s32 *root, | |
168 | int *blocksize, char **prefix, char *volume, unsigned long *mount_opts) | |
169 | { | |
170 | char *p; | |
171 | substring_t args[MAX_OPT_ARGS]; | |
172 | ||
173 | /* Fill in defaults */ | |
174 | ||
21559981 DH |
175 | *uid = current_uid(); |
176 | *gid = current_gid(); | |
1da177e4 LT |
177 | *reserved = 2; |
178 | *root = -1; | |
179 | *blocksize = -1; | |
180 | volume[0] = ':'; | |
181 | volume[1] = 0; | |
182 | *mount_opts = 0; | |
183 | if (!options) | |
184 | return 1; | |
185 | ||
186 | while ((p = strsep(&options, ",")) != NULL) { | |
187 | int token, n, option; | |
188 | if (!*p) | |
189 | continue; | |
190 | ||
191 | token = match_token(p, tokens, args); | |
192 | switch (token) { | |
193 | case Opt_bs: | |
194 | if (match_int(&args[0], &n)) | |
217686e9 | 195 | return 0; |
1da177e4 LT |
196 | if (n != 512 && n != 1024 && n != 2048 |
197 | && n != 4096) { | |
198 | printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n"); | |
199 | return 0; | |
200 | } | |
201 | *blocksize = n; | |
202 | break; | |
203 | case Opt_mode: | |
204 | if (match_octal(&args[0], &option)) | |
217686e9 | 205 | return 0; |
1da177e4 LT |
206 | *mode = option & 0777; |
207 | *mount_opts |= SF_SETMODE; | |
208 | break; | |
209 | case Opt_mufs: | |
210 | *mount_opts |= SF_MUFS; | |
211 | break; | |
212 | case Opt_prefix: | |
1da177e4 LT |
213 | *prefix = match_strdup(&args[0]); |
214 | if (!*prefix) | |
215 | return 0; | |
216 | *mount_opts |= SF_PREFIX; | |
217 | break; | |
218 | case Opt_protect: | |
219 | *mount_opts |= SF_IMMUTABLE; | |
220 | break; | |
221 | case Opt_reserved: | |
222 | if (match_int(&args[0], reserved)) | |
217686e9 | 223 | return 0; |
1da177e4 LT |
224 | break; |
225 | case Opt_root: | |
226 | if (match_int(&args[0], root)) | |
217686e9 | 227 | return 0; |
1da177e4 LT |
228 | break; |
229 | case Opt_setgid: | |
230 | if (match_int(&args[0], &option)) | |
217686e9 | 231 | return 0; |
1da177e4 LT |
232 | *gid = option; |
233 | *mount_opts |= SF_SETGID; | |
234 | break; | |
235 | case Opt_setuid: | |
236 | if (match_int(&args[0], &option)) | |
217686e9 | 237 | return 0; |
1da177e4 LT |
238 | *uid = option; |
239 | *mount_opts |= SF_SETUID; | |
240 | break; | |
241 | case Opt_verbose: | |
242 | *mount_opts |= SF_VERBOSE; | |
243 | break; | |
244 | case Opt_volume: { | |
245 | char *vol = match_strdup(&args[0]); | |
6db27dd9 JM |
246 | if (!vol) |
247 | return 0; | |
1da177e4 LT |
248 | strlcpy(volume, vol, 32); |
249 | kfree(vol); | |
250 | break; | |
251 | } | |
252 | case Opt_ignore: | |
253 | /* Silently ignore the quota options */ | |
254 | break; | |
255 | default: | |
256 | printk("AFFS: Unrecognized mount option \"%s\" " | |
257 | "or missing value\n", p); | |
258 | return 0; | |
259 | } | |
260 | } | |
261 | return 1; | |
262 | } | |
263 | ||
264 | /* This function definitely needs to be split up. Some fine day I'll | |
265 | * hopefully have the guts to do so. Until then: sorry for the mess. | |
266 | */ | |
267 | ||
268 | static int affs_fill_super(struct super_block *sb, void *data, int silent) | |
269 | { | |
270 | struct affs_sb_info *sbi; | |
271 | struct buffer_head *root_bh = NULL; | |
272 | struct buffer_head *boot_bh; | |
273 | struct inode *root_inode = NULL; | |
274 | s32 root_block; | |
275 | int size, blocksize; | |
276 | u32 chksum; | |
277 | int num_bm; | |
278 | int i, j; | |
279 | s32 key; | |
280 | uid_t uid; | |
281 | gid_t gid; | |
282 | int reserved; | |
283 | unsigned long mount_flags; | |
284 | int tmp_flags; /* fix remount prototype... */ | |
2b943cf0 | 285 | u8 sig[4]; |
210f8559 | 286 | int ret = -EINVAL; |
1da177e4 | 287 | |
e9b3961b MS |
288 | save_mount_options(sb, data); |
289 | ||
1da177e4 LT |
290 | pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options"); |
291 | ||
292 | sb->s_magic = AFFS_SUPER_MAGIC; | |
293 | sb->s_op = &affs_sops; | |
294 | sb->s_flags |= MS_NODIRATIME; | |
295 | ||
f8314dc6 | 296 | sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL); |
1da177e4 LT |
297 | if (!sbi) |
298 | return -ENOMEM; | |
74c41429 | 299 | |
1da177e4 | 300 | sb->s_fs_info = sbi; |
7d135a5d | 301 | mutex_init(&sbi->s_bmlock); |
29333920 | 302 | spin_lock_init(&sbi->symlink_lock); |
1da177e4 LT |
303 | |
304 | if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block, | |
305 | &blocksize,&sbi->s_prefix, | |
306 | sbi->s_volume, &mount_flags)) { | |
307 | printk(KERN_ERR "AFFS: Error parsing options\n"); | |
afc70ed0 AV |
308 | kfree(sbi->s_prefix); |
309 | kfree(sbi); | |
1da177e4 LT |
310 | return -EINVAL; |
311 | } | |
312 | /* N.B. after this point s_prefix must be released */ | |
313 | ||
314 | sbi->s_flags = mount_flags; | |
315 | sbi->s_mode = i; | |
316 | sbi->s_uid = uid; | |
317 | sbi->s_gid = gid; | |
318 | sbi->s_reserved= reserved; | |
319 | ||
320 | /* Get the size of the device in 512-byte blocks. | |
321 | * If we later see that the partition uses bigger | |
322 | * blocks, we will have to change it. | |
323 | */ | |
324 | ||
325 | size = sb->s_bdev->bd_inode->i_size >> 9; | |
326 | pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size); | |
327 | ||
328 | affs_set_blocksize(sb, PAGE_SIZE); | |
329 | /* Try to find root block. Its location depends on the block size. */ | |
330 | ||
331 | i = 512; | |
332 | j = 4096; | |
333 | if (blocksize > 0) { | |
334 | i = j = blocksize; | |
335 | size = size / (blocksize / 512); | |
336 | } | |
337 | for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) { | |
338 | sbi->s_root_block = root_block; | |
339 | if (root_block < 0) | |
340 | sbi->s_root_block = (reserved + size - 1) / 2; | |
341 | pr_debug("AFFS: setting blocksize to %d\n", blocksize); | |
342 | affs_set_blocksize(sb, blocksize); | |
343 | sbi->s_partition_size = size; | |
344 | ||
345 | /* The root block location that was calculated above is not | |
346 | * correct if the partition size is an odd number of 512- | |
347 | * byte blocks, which will be rounded down to a number of | |
348 | * 1024-byte blocks, and if there were an even number of | |
349 | * reserved blocks. Ideally, all partition checkers should | |
350 | * report the real number of blocks of the real blocksize, | |
351 | * but since this just cannot be done, we have to try to | |
352 | * find the root block anyways. In the above case, it is one | |
353 | * block behind the calculated one. So we check this one, too. | |
354 | */ | |
355 | for (num_bm = 0; num_bm < 2; num_bm++) { | |
356 | pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, " | |
357 | "size=%d, reserved=%d\n", | |
358 | sb->s_id, | |
359 | sbi->s_root_block + num_bm, | |
360 | blocksize, size, reserved); | |
361 | root_bh = affs_bread(sb, sbi->s_root_block + num_bm); | |
362 | if (!root_bh) | |
363 | continue; | |
364 | if (!affs_checksum_block(sb, root_bh) && | |
365 | be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT && | |
366 | be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) { | |
367 | sbi->s_hashsize = blocksize / 4 - 56; | |
368 | sbi->s_root_block += num_bm; | |
369 | key = 1; | |
370 | goto got_root; | |
371 | } | |
372 | affs_brelse(root_bh); | |
373 | root_bh = NULL; | |
374 | } | |
375 | } | |
376 | if (!silent) | |
377 | printk(KERN_ERR "AFFS: No valid root block on device %s\n", | |
378 | sb->s_id); | |
379 | goto out_error; | |
380 | ||
381 | /* N.B. after this point bh must be released */ | |
382 | got_root: | |
383 | root_block = sbi->s_root_block; | |
384 | ||
385 | /* Find out which kind of FS we have */ | |
386 | boot_bh = sb_bread(sb, 0); | |
387 | if (!boot_bh) { | |
388 | printk(KERN_ERR "AFFS: Cannot read boot block\n"); | |
389 | goto out_error; | |
390 | } | |
2b943cf0 | 391 | memcpy(sig, boot_bh->b_data, 4); |
1da177e4 | 392 | brelse(boot_bh); |
2b943cf0 | 393 | chksum = be32_to_cpu(*(__be32 *)sig); |
1da177e4 LT |
394 | |
395 | /* Dircache filesystems are compatible with non-dircache ones | |
396 | * when reading. As long as they aren't supported, writing is | |
397 | * not recommended. | |
398 | */ | |
399 | if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS | |
400 | || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) { | |
401 | printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n", | |
402 | sb->s_id); | |
403 | sb->s_flags |= MS_RDONLY; | |
404 | } | |
405 | switch (chksum) { | |
406 | case MUFS_FS: | |
407 | case MUFS_INTLFFS: | |
408 | case MUFS_DCFFS: | |
409 | sbi->s_flags |= SF_MUFS; | |
410 | /* fall thru */ | |
411 | case FS_INTLFFS: | |
412 | case FS_DCFFS: | |
413 | sbi->s_flags |= SF_INTL; | |
414 | break; | |
415 | case MUFS_FFS: | |
416 | sbi->s_flags |= SF_MUFS; | |
417 | break; | |
418 | case FS_FFS: | |
419 | break; | |
420 | case MUFS_OFS: | |
421 | sbi->s_flags |= SF_MUFS; | |
422 | /* fall thru */ | |
423 | case FS_OFS: | |
424 | sbi->s_flags |= SF_OFS; | |
425 | sb->s_flags |= MS_NOEXEC; | |
426 | break; | |
427 | case MUFS_DCOFS: | |
428 | case MUFS_INTLOFS: | |
429 | sbi->s_flags |= SF_MUFS; | |
430 | case FS_DCOFS: | |
431 | case FS_INTLOFS: | |
432 | sbi->s_flags |= SF_INTL | SF_OFS; | |
433 | sb->s_flags |= MS_NOEXEC; | |
434 | break; | |
435 | default: | |
436 | printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n", | |
437 | sb->s_id, chksum); | |
438 | goto out_error; | |
439 | } | |
440 | ||
441 | if (mount_flags & SF_VERBOSE) { | |
2b943cf0 AV |
442 | u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0]; |
443 | printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n", | |
444 | len > 31 ? 31 : len, | |
1da177e4 | 445 | AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1, |
2b943cf0 | 446 | sig, sig[3] + '0', blocksize); |
1da177e4 LT |
447 | } |
448 | ||
449 | sb->s_flags |= MS_NODEV | MS_NOSUID; | |
450 | ||
451 | sbi->s_data_blksize = sb->s_blocksize; | |
452 | if (sbi->s_flags & SF_OFS) | |
453 | sbi->s_data_blksize -= 24; | |
454 | ||
455 | /* Keep super block in cache */ | |
456 | sbi->s_root_bh = root_bh; | |
457 | /* N.B. after this point s_root_bh must be released */ | |
458 | ||
459 | tmp_flags = sb->s_flags; | |
460 | if (affs_init_bitmap(sb, &tmp_flags)) | |
461 | goto out_error; | |
462 | sb->s_flags = tmp_flags; | |
463 | ||
464 | /* set up enough so that it can read an inode */ | |
465 | ||
210f8559 DH |
466 | root_inode = affs_iget(sb, root_block); |
467 | if (IS_ERR(root_inode)) { | |
468 | ret = PTR_ERR(root_inode); | |
48fde701 | 469 | goto out_error; |
210f8559 DH |
470 | } |
471 | ||
a129880d AV |
472 | if (AFFS_SB(sb)->s_flags & SF_INTL) |
473 | sb->s_d_op = &affs_intl_dentry_operations; | |
474 | else | |
475 | sb->s_d_op = &affs_dentry_operations; | |
476 | ||
48fde701 | 477 | sb->s_root = d_make_root(root_inode); |
1da177e4 LT |
478 | if (!sb->s_root) { |
479 | printk(KERN_ERR "AFFS: Get root inode failed\n"); | |
480 | goto out_error; | |
481 | } | |
1da177e4 LT |
482 | |
483 | pr_debug("AFFS: s_flags=%lX\n",sb->s_flags); | |
484 | return 0; | |
485 | ||
486 | /* | |
487 | * Begin the cascaded cleanup ... | |
488 | */ | |
489 | out_error: | |
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 | |
0164b1a3 | 545 | if (*flags & MS_RDONLY) |
1da177e4 | 546 | affs_free_bitmap(sb); |
0164b1a3 | 547 | else |
1da177e4 LT |
548 | res = affs_init_bitmap(sb, flags); |
549 | ||
550 | return res; | |
551 | } | |
552 | ||
553 | static int | |
726c3342 | 554 | affs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 555 | { |
726c3342 | 556 | struct super_block *sb = dentry->d_sb; |
1da177e4 | 557 | int free; |
a6a2a73c | 558 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
1da177e4 LT |
559 | |
560 | pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size, | |
561 | AFFS_SB(sb)->s_reserved); | |
562 | ||
563 | free = affs_count_free_blocks(sb); | |
564 | buf->f_type = AFFS_SUPER_MAGIC; | |
565 | buf->f_bsize = sb->s_blocksize; | |
566 | buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved; | |
567 | buf->f_bfree = free; | |
568 | buf->f_bavail = free; | |
a6a2a73c CL |
569 | buf->f_fsid.val[0] = (u32)id; |
570 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
571 | buf->f_namelen = 30; | |
1da177e4 LT |
572 | return 0; |
573 | } | |
574 | ||
152a0836 AV |
575 | static struct dentry *affs_mount(struct file_system_type *fs_type, |
576 | int flags, const char *dev_name, void *data) | |
1da177e4 | 577 | { |
152a0836 | 578 | return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super); |
1da177e4 LT |
579 | } |
580 | ||
581 | static struct file_system_type affs_fs_type = { | |
582 | .owner = THIS_MODULE, | |
583 | .name = "affs", | |
152a0836 | 584 | .mount = affs_mount, |
1da177e4 LT |
585 | .kill_sb = kill_block_super, |
586 | .fs_flags = FS_REQUIRES_DEV, | |
587 | }; | |
588 | ||
589 | static int __init init_affs_fs(void) | |
590 | { | |
591 | int err = init_inodecache(); | |
592 | if (err) | |
593 | goto out1; | |
594 | err = register_filesystem(&affs_fs_type); | |
595 | if (err) | |
596 | goto out; | |
597 | return 0; | |
598 | out: | |
599 | destroy_inodecache(); | |
600 | out1: | |
601 | return err; | |
602 | } | |
603 | ||
604 | static void __exit exit_affs_fs(void) | |
605 | { | |
606 | unregister_filesystem(&affs_fs_type); | |
607 | destroy_inodecache(); | |
608 | } | |
609 | ||
610 | MODULE_DESCRIPTION("Amiga filesystem support for Linux"); | |
611 | MODULE_LICENSE("GPL"); | |
612 | ||
613 | module_init(init_affs_fs) | |
614 | module_exit(exit_affs_fs) |