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> |
3dd84782 | 20 | #include <linux/writeback.h> |
1da177e4 LT |
21 | #include "affs.h" |
22 | ||
23 | extern struct timezone sys_tz; | |
24 | ||
726c3342 | 25 | static int affs_statfs(struct dentry *dentry, struct kstatfs *buf); |
1da177e4 LT |
26 | static int affs_remount (struct super_block *sb, int *flags, char *data); |
27 | ||
e2896436 | 28 | static void |
bc86256d | 29 | affs_commit_super(struct super_block *sb, int wait) |
e2896436 CH |
30 | { |
31 | struct affs_sb_info *sbi = AFFS_SB(sb); | |
32 | struct buffer_head *bh = sbi->s_root_bh; | |
33 | struct affs_root_tail *tail = AFFS_ROOT_TAIL(sb, bh); | |
34 | ||
a8371074 | 35 | lock_buffer(bh); |
e2896436 CH |
36 | secs_to_datestamp(get_seconds(), &tail->disk_change); |
37 | affs_fix_checksum(sb, bh); | |
a8371074 AB |
38 | unlock_buffer(bh); |
39 | ||
e2896436 | 40 | mark_buffer_dirty(bh); |
7435d506 AB |
41 | if (wait) |
42 | sync_dirty_buffer(bh); | |
e2896436 CH |
43 | } |
44 | ||
1da177e4 LT |
45 | static void |
46 | affs_put_super(struct super_block *sb) | |
47 | { | |
48 | struct affs_sb_info *sbi = AFFS_SB(sb); | |
49 | pr_debug("AFFS: put_super()\n"); | |
50 | ||
3dd84782 | 51 | cancel_delayed_work_sync(&sbi->sb_work); |
f99d49ad | 52 | kfree(sbi->s_prefix); |
1da177e4 LT |
53 | affs_free_bitmap(sb); |
54 | affs_brelse(sbi->s_root_bh); | |
55 | kfree(sbi); | |
56 | sb->s_fs_info = NULL; | |
1da177e4 LT |
57 | } |
58 | ||
e2896436 CH |
59 | static int |
60 | affs_sync_fs(struct super_block *sb, int wait) | |
61 | { | |
bc86256d | 62 | affs_commit_super(sb, wait); |
e2896436 CH |
63 | return 0; |
64 | } | |
65 | ||
3dd84782 AB |
66 | static void flush_superblock(struct work_struct *work) |
67 | { | |
68 | struct affs_sb_info *sbi; | |
69 | struct super_block *sb; | |
70 | ||
71 | sbi = container_of(work, struct affs_sb_info, sb_work.work); | |
72 | sb = sbi->sb; | |
73 | ||
74 | spin_lock(&sbi->work_lock); | |
75 | sbi->work_queued = 0; | |
76 | spin_unlock(&sbi->work_lock); | |
77 | ||
78 | affs_commit_super(sb, 1); | |
79 | } | |
80 | ||
81 | void affs_mark_sb_dirty(struct super_block *sb) | |
82 | { | |
83 | struct affs_sb_info *sbi = AFFS_SB(sb); | |
84 | unsigned long delay; | |
85 | ||
86 | if (sb->s_flags & MS_RDONLY) | |
87 | return; | |
88 | ||
89 | spin_lock(&sbi->work_lock); | |
90 | if (!sbi->work_queued) { | |
91 | delay = msecs_to_jiffies(dirty_writeback_interval * 10); | |
92 | queue_delayed_work(system_long_wq, &sbi->sb_work, delay); | |
93 | sbi->work_queued = 1; | |
94 | } | |
95 | spin_unlock(&sbi->work_lock); | |
96 | } | |
97 | ||
e18b890b | 98 | static struct kmem_cache * affs_inode_cachep; |
1da177e4 LT |
99 | |
100 | static struct inode *affs_alloc_inode(struct super_block *sb) | |
101 | { | |
dca3c336 RZ |
102 | struct affs_inode_info *i; |
103 | ||
104 | i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL); | |
105 | if (!i) | |
1da177e4 | 106 | return NULL; |
dca3c336 RZ |
107 | |
108 | i->vfs_inode.i_version = 1; | |
109 | i->i_lc = NULL; | |
110 | i->i_ext_bh = NULL; | |
111 | i->i_pa_cnt = 0; | |
112 | ||
113 | return &i->vfs_inode; | |
1da177e4 LT |
114 | } |
115 | ||
fa0d7e3d | 116 | static void affs_i_callback(struct rcu_head *head) |
1da177e4 | 117 | { |
fa0d7e3d | 118 | struct inode *inode = container_of(head, struct inode, i_rcu); |
1da177e4 LT |
119 | kmem_cache_free(affs_inode_cachep, AFFS_I(inode)); |
120 | } | |
121 | ||
fa0d7e3d NP |
122 | static void affs_destroy_inode(struct inode *inode) |
123 | { | |
124 | call_rcu(&inode->i_rcu, affs_i_callback); | |
125 | } | |
126 | ||
51cc5068 | 127 | static void init_once(void *foo) |
1da177e4 LT |
128 | { |
129 | struct affs_inode_info *ei = (struct affs_inode_info *) foo; | |
130 | ||
756b0322 TG |
131 | sema_init(&ei->i_link_lock, 1); |
132 | sema_init(&ei->i_ext_lock, 1); | |
a35afb83 | 133 | inode_init_once(&ei->vfs_inode); |
1da177e4 LT |
134 | } |
135 | ||
136 | static int init_inodecache(void) | |
137 | { | |
138 | affs_inode_cachep = kmem_cache_create("affs_inode_cache", | |
139 | sizeof(struct affs_inode_info), | |
fffb60f9 PJ |
140 | 0, (SLAB_RECLAIM_ACCOUNT| |
141 | SLAB_MEM_SPREAD), | |
20c2df83 | 142 | init_once); |
1da177e4 LT |
143 | if (affs_inode_cachep == NULL) |
144 | return -ENOMEM; | |
145 | return 0; | |
146 | } | |
147 | ||
148 | static void destroy_inodecache(void) | |
149 | { | |
1a1d92c1 | 150 | kmem_cache_destroy(affs_inode_cachep); |
1da177e4 LT |
151 | } |
152 | ||
ee9b6d61 | 153 | static const struct super_operations affs_sops = { |
1da177e4 LT |
154 | .alloc_inode = affs_alloc_inode, |
155 | .destroy_inode = affs_destroy_inode, | |
1da177e4 | 156 | .write_inode = affs_write_inode, |
f053ddde | 157 | .evict_inode = affs_evict_inode, |
1da177e4 | 158 | .put_super = affs_put_super, |
e2896436 | 159 | .sync_fs = affs_sync_fs, |
1da177e4 LT |
160 | .statfs = affs_statfs, |
161 | .remount_fs = affs_remount, | |
e9b3961b | 162 | .show_options = generic_show_options, |
1da177e4 LT |
163 | }; |
164 | ||
165 | enum { | |
166 | Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect, | |
167 | Opt_reserved, Opt_root, Opt_setgid, Opt_setuid, | |
168 | Opt_verbose, Opt_volume, Opt_ignore, Opt_err, | |
169 | }; | |
170 | ||
a447c093 | 171 | static const match_table_t tokens = { |
1da177e4 LT |
172 | {Opt_bs, "bs=%u"}, |
173 | {Opt_mode, "mode=%o"}, | |
174 | {Opt_mufs, "mufs"}, | |
175 | {Opt_prefix, "prefix=%s"}, | |
176 | {Opt_protect, "protect"}, | |
177 | {Opt_reserved, "reserved=%u"}, | |
178 | {Opt_root, "root=%u"}, | |
179 | {Opt_setgid, "setgid=%u"}, | |
180 | {Opt_setuid, "setuid=%u"}, | |
181 | {Opt_verbose, "verbose"}, | |
182 | {Opt_volume, "volume=%s"}, | |
183 | {Opt_ignore, "grpquota"}, | |
184 | {Opt_ignore, "noquota"}, | |
185 | {Opt_ignore, "quota"}, | |
186 | {Opt_ignore, "usrquota"}, | |
187 | {Opt_err, NULL}, | |
188 | }; | |
189 | ||
190 | static int | |
191 | parse_options(char *options, uid_t *uid, gid_t *gid, int *mode, int *reserved, s32 *root, | |
192 | int *blocksize, char **prefix, char *volume, unsigned long *mount_opts) | |
193 | { | |
194 | char *p; | |
195 | substring_t args[MAX_OPT_ARGS]; | |
196 | ||
197 | /* Fill in defaults */ | |
198 | ||
21559981 DH |
199 | *uid = current_uid(); |
200 | *gid = current_gid(); | |
1da177e4 LT |
201 | *reserved = 2; |
202 | *root = -1; | |
203 | *blocksize = -1; | |
204 | volume[0] = ':'; | |
205 | volume[1] = 0; | |
206 | *mount_opts = 0; | |
207 | if (!options) | |
208 | return 1; | |
209 | ||
210 | while ((p = strsep(&options, ",")) != NULL) { | |
211 | int token, n, option; | |
212 | if (!*p) | |
213 | continue; | |
214 | ||
215 | token = match_token(p, tokens, args); | |
216 | switch (token) { | |
217 | case Opt_bs: | |
218 | if (match_int(&args[0], &n)) | |
217686e9 | 219 | return 0; |
1da177e4 LT |
220 | if (n != 512 && n != 1024 && n != 2048 |
221 | && n != 4096) { | |
222 | printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n"); | |
223 | return 0; | |
224 | } | |
225 | *blocksize = n; | |
226 | break; | |
227 | case Opt_mode: | |
228 | if (match_octal(&args[0], &option)) | |
217686e9 | 229 | return 0; |
1da177e4 LT |
230 | *mode = option & 0777; |
231 | *mount_opts |= SF_SETMODE; | |
232 | break; | |
233 | case Opt_mufs: | |
234 | *mount_opts |= SF_MUFS; | |
235 | break; | |
236 | case Opt_prefix: | |
1da177e4 LT |
237 | *prefix = match_strdup(&args[0]); |
238 | if (!*prefix) | |
239 | return 0; | |
240 | *mount_opts |= SF_PREFIX; | |
241 | break; | |
242 | case Opt_protect: | |
243 | *mount_opts |= SF_IMMUTABLE; | |
244 | break; | |
245 | case Opt_reserved: | |
246 | if (match_int(&args[0], reserved)) | |
217686e9 | 247 | return 0; |
1da177e4 LT |
248 | break; |
249 | case Opt_root: | |
250 | if (match_int(&args[0], root)) | |
217686e9 | 251 | return 0; |
1da177e4 LT |
252 | break; |
253 | case Opt_setgid: | |
254 | if (match_int(&args[0], &option)) | |
217686e9 | 255 | return 0; |
1da177e4 LT |
256 | *gid = option; |
257 | *mount_opts |= SF_SETGID; | |
258 | break; | |
259 | case Opt_setuid: | |
260 | if (match_int(&args[0], &option)) | |
217686e9 | 261 | return 0; |
1da177e4 LT |
262 | *uid = option; |
263 | *mount_opts |= SF_SETUID; | |
264 | break; | |
265 | case Opt_verbose: | |
266 | *mount_opts |= SF_VERBOSE; | |
267 | break; | |
268 | case Opt_volume: { | |
269 | char *vol = match_strdup(&args[0]); | |
6db27dd9 JM |
270 | if (!vol) |
271 | return 0; | |
1da177e4 LT |
272 | strlcpy(volume, vol, 32); |
273 | kfree(vol); | |
274 | break; | |
275 | } | |
276 | case Opt_ignore: | |
277 | /* Silently ignore the quota options */ | |
278 | break; | |
279 | default: | |
280 | printk("AFFS: Unrecognized mount option \"%s\" " | |
281 | "or missing value\n", p); | |
282 | return 0; | |
283 | } | |
284 | } | |
285 | return 1; | |
286 | } | |
287 | ||
288 | /* This function definitely needs to be split up. Some fine day I'll | |
289 | * hopefully have the guts to do so. Until then: sorry for the mess. | |
290 | */ | |
291 | ||
292 | static int affs_fill_super(struct super_block *sb, void *data, int silent) | |
293 | { | |
294 | struct affs_sb_info *sbi; | |
295 | struct buffer_head *root_bh = NULL; | |
296 | struct buffer_head *boot_bh; | |
297 | struct inode *root_inode = NULL; | |
298 | s32 root_block; | |
299 | int size, blocksize; | |
300 | u32 chksum; | |
301 | int num_bm; | |
302 | int i, j; | |
303 | s32 key; | |
304 | uid_t uid; | |
305 | gid_t gid; | |
306 | int reserved; | |
307 | unsigned long mount_flags; | |
308 | int tmp_flags; /* fix remount prototype... */ | |
2b943cf0 | 309 | u8 sig[4]; |
210f8559 | 310 | int ret = -EINVAL; |
1da177e4 | 311 | |
e9b3961b MS |
312 | save_mount_options(sb, data); |
313 | ||
1da177e4 LT |
314 | pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options"); |
315 | ||
316 | sb->s_magic = AFFS_SUPER_MAGIC; | |
317 | sb->s_op = &affs_sops; | |
318 | sb->s_flags |= MS_NODIRATIME; | |
319 | ||
f8314dc6 | 320 | sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL); |
1da177e4 LT |
321 | if (!sbi) |
322 | return -ENOMEM; | |
74c41429 | 323 | |
1da177e4 | 324 | sb->s_fs_info = sbi; |
a215fef7 | 325 | sbi->sb = sb; |
7d135a5d | 326 | mutex_init(&sbi->s_bmlock); |
29333920 | 327 | spin_lock_init(&sbi->symlink_lock); |
3dd84782 AB |
328 | spin_lock_init(&sbi->work_lock); |
329 | INIT_DELAYED_WORK(&sbi->sb_work, flush_superblock); | |
1da177e4 LT |
330 | |
331 | if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block, | |
332 | &blocksize,&sbi->s_prefix, | |
333 | sbi->s_volume, &mount_flags)) { | |
334 | printk(KERN_ERR "AFFS: Error parsing options\n"); | |
afc70ed0 AV |
335 | kfree(sbi->s_prefix); |
336 | kfree(sbi); | |
1da177e4 LT |
337 | return -EINVAL; |
338 | } | |
339 | /* N.B. after this point s_prefix must be released */ | |
340 | ||
341 | sbi->s_flags = mount_flags; | |
342 | sbi->s_mode = i; | |
343 | sbi->s_uid = uid; | |
344 | sbi->s_gid = gid; | |
345 | sbi->s_reserved= reserved; | |
346 | ||
347 | /* Get the size of the device in 512-byte blocks. | |
348 | * If we later see that the partition uses bigger | |
349 | * blocks, we will have to change it. | |
350 | */ | |
351 | ||
352 | size = sb->s_bdev->bd_inode->i_size >> 9; | |
353 | pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size); | |
354 | ||
355 | affs_set_blocksize(sb, PAGE_SIZE); | |
356 | /* Try to find root block. Its location depends on the block size. */ | |
357 | ||
358 | i = 512; | |
359 | j = 4096; | |
360 | if (blocksize > 0) { | |
361 | i = j = blocksize; | |
362 | size = size / (blocksize / 512); | |
363 | } | |
364 | for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) { | |
365 | sbi->s_root_block = root_block; | |
366 | if (root_block < 0) | |
367 | sbi->s_root_block = (reserved + size - 1) / 2; | |
368 | pr_debug("AFFS: setting blocksize to %d\n", blocksize); | |
369 | affs_set_blocksize(sb, blocksize); | |
370 | sbi->s_partition_size = size; | |
371 | ||
372 | /* The root block location that was calculated above is not | |
373 | * correct if the partition size is an odd number of 512- | |
374 | * byte blocks, which will be rounded down to a number of | |
375 | * 1024-byte blocks, and if there were an even number of | |
376 | * reserved blocks. Ideally, all partition checkers should | |
377 | * report the real number of blocks of the real blocksize, | |
378 | * but since this just cannot be done, we have to try to | |
379 | * find the root block anyways. In the above case, it is one | |
380 | * block behind the calculated one. So we check this one, too. | |
381 | */ | |
382 | for (num_bm = 0; num_bm < 2; num_bm++) { | |
383 | pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, " | |
384 | "size=%d, reserved=%d\n", | |
385 | sb->s_id, | |
386 | sbi->s_root_block + num_bm, | |
387 | blocksize, size, reserved); | |
388 | root_bh = affs_bread(sb, sbi->s_root_block + num_bm); | |
389 | if (!root_bh) | |
390 | continue; | |
391 | if (!affs_checksum_block(sb, root_bh) && | |
392 | be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT && | |
393 | be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) { | |
394 | sbi->s_hashsize = blocksize / 4 - 56; | |
395 | sbi->s_root_block += num_bm; | |
396 | key = 1; | |
397 | goto got_root; | |
398 | } | |
399 | affs_brelse(root_bh); | |
400 | root_bh = NULL; | |
401 | } | |
402 | } | |
403 | if (!silent) | |
404 | printk(KERN_ERR "AFFS: No valid root block on device %s\n", | |
405 | sb->s_id); | |
406 | goto out_error; | |
407 | ||
408 | /* N.B. after this point bh must be released */ | |
409 | got_root: | |
410 | root_block = sbi->s_root_block; | |
411 | ||
412 | /* Find out which kind of FS we have */ | |
413 | boot_bh = sb_bread(sb, 0); | |
414 | if (!boot_bh) { | |
415 | printk(KERN_ERR "AFFS: Cannot read boot block\n"); | |
416 | goto out_error; | |
417 | } | |
2b943cf0 | 418 | memcpy(sig, boot_bh->b_data, 4); |
1da177e4 | 419 | brelse(boot_bh); |
2b943cf0 | 420 | chksum = be32_to_cpu(*(__be32 *)sig); |
1da177e4 LT |
421 | |
422 | /* Dircache filesystems are compatible with non-dircache ones | |
423 | * when reading. As long as they aren't supported, writing is | |
424 | * not recommended. | |
425 | */ | |
426 | if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS | |
427 | || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) { | |
428 | printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n", | |
429 | sb->s_id); | |
430 | sb->s_flags |= MS_RDONLY; | |
431 | } | |
432 | switch (chksum) { | |
433 | case MUFS_FS: | |
434 | case MUFS_INTLFFS: | |
435 | case MUFS_DCFFS: | |
436 | sbi->s_flags |= SF_MUFS; | |
437 | /* fall thru */ | |
438 | case FS_INTLFFS: | |
439 | case FS_DCFFS: | |
440 | sbi->s_flags |= SF_INTL; | |
441 | break; | |
442 | case MUFS_FFS: | |
443 | sbi->s_flags |= SF_MUFS; | |
444 | break; | |
445 | case FS_FFS: | |
446 | break; | |
447 | case MUFS_OFS: | |
448 | sbi->s_flags |= SF_MUFS; | |
449 | /* fall thru */ | |
450 | case FS_OFS: | |
451 | sbi->s_flags |= SF_OFS; | |
452 | sb->s_flags |= MS_NOEXEC; | |
453 | break; | |
454 | case MUFS_DCOFS: | |
455 | case MUFS_INTLOFS: | |
456 | sbi->s_flags |= SF_MUFS; | |
457 | case FS_DCOFS: | |
458 | case FS_INTLOFS: | |
459 | sbi->s_flags |= SF_INTL | SF_OFS; | |
460 | sb->s_flags |= MS_NOEXEC; | |
461 | break; | |
462 | default: | |
463 | printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n", | |
464 | sb->s_id, chksum); | |
465 | goto out_error; | |
466 | } | |
467 | ||
468 | if (mount_flags & SF_VERBOSE) { | |
2b943cf0 AV |
469 | u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0]; |
470 | printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n", | |
471 | len > 31 ? 31 : len, | |
1da177e4 | 472 | AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1, |
2b943cf0 | 473 | sig, sig[3] + '0', blocksize); |
1da177e4 LT |
474 | } |
475 | ||
476 | sb->s_flags |= MS_NODEV | MS_NOSUID; | |
477 | ||
478 | sbi->s_data_blksize = sb->s_blocksize; | |
479 | if (sbi->s_flags & SF_OFS) | |
480 | sbi->s_data_blksize -= 24; | |
481 | ||
482 | /* Keep super block in cache */ | |
483 | sbi->s_root_bh = root_bh; | |
484 | /* N.B. after this point s_root_bh must be released */ | |
485 | ||
486 | tmp_flags = sb->s_flags; | |
487 | if (affs_init_bitmap(sb, &tmp_flags)) | |
488 | goto out_error; | |
489 | sb->s_flags = tmp_flags; | |
490 | ||
491 | /* set up enough so that it can read an inode */ | |
492 | ||
210f8559 DH |
493 | root_inode = affs_iget(sb, root_block); |
494 | if (IS_ERR(root_inode)) { | |
495 | ret = PTR_ERR(root_inode); | |
48fde701 | 496 | goto out_error; |
210f8559 DH |
497 | } |
498 | ||
a129880d AV |
499 | if (AFFS_SB(sb)->s_flags & SF_INTL) |
500 | sb->s_d_op = &affs_intl_dentry_operations; | |
501 | else | |
502 | sb->s_d_op = &affs_dentry_operations; | |
503 | ||
48fde701 | 504 | sb->s_root = d_make_root(root_inode); |
1da177e4 LT |
505 | if (!sb->s_root) { |
506 | printk(KERN_ERR "AFFS: Get root inode failed\n"); | |
507 | goto out_error; | |
508 | } | |
1da177e4 LT |
509 | |
510 | pr_debug("AFFS: s_flags=%lX\n",sb->s_flags); | |
511 | return 0; | |
512 | ||
513 | /* | |
514 | * Begin the cascaded cleanup ... | |
515 | */ | |
516 | out_error: | |
f99d49ad | 517 | kfree(sbi->s_bitmap); |
1da177e4 | 518 | affs_brelse(root_bh); |
f99d49ad | 519 | kfree(sbi->s_prefix); |
1da177e4 LT |
520 | kfree(sbi); |
521 | sb->s_fs_info = NULL; | |
210f8559 | 522 | return ret; |
1da177e4 LT |
523 | } |
524 | ||
525 | static int | |
526 | affs_remount(struct super_block *sb, int *flags, char *data) | |
527 | { | |
528 | struct affs_sb_info *sbi = AFFS_SB(sb); | |
529 | int blocksize; | |
530 | uid_t uid; | |
531 | gid_t gid; | |
532 | int mode; | |
533 | int reserved; | |
534 | int root_block; | |
535 | unsigned long mount_flags; | |
536 | int res = 0; | |
e9b3961b | 537 | char *new_opts = kstrdup(data, GFP_KERNEL); |
29333920 AV |
538 | char volume[32]; |
539 | char *prefix = NULL; | |
1da177e4 LT |
540 | |
541 | pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data); | |
542 | ||
543 | *flags |= MS_NODIRATIME; | |
544 | ||
29333920 | 545 | memcpy(volume, sbi->s_volume, 32); |
e9b3961b | 546 | if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block, |
29333920 | 547 | &blocksize, &prefix, volume, |
e9b3961b | 548 | &mount_flags)) { |
29333920 | 549 | kfree(prefix); |
e9b3961b | 550 | kfree(new_opts); |
1da177e4 | 551 | return -EINVAL; |
e9b3961b | 552 | } |
74c41429 | 553 | |
3dd84782 | 554 | flush_delayed_work_sync(&sbi->sb_work); |
2a32cebd | 555 | replace_mount_options(sb, new_opts); |
e9b3961b | 556 | |
1da177e4 LT |
557 | sbi->s_flags = mount_flags; |
558 | sbi->s_mode = mode; | |
559 | sbi->s_uid = uid; | |
560 | sbi->s_gid = gid; | |
29333920 AV |
561 | /* protect against readers */ |
562 | spin_lock(&sbi->symlink_lock); | |
563 | if (prefix) { | |
564 | kfree(sbi->s_prefix); | |
565 | sbi->s_prefix = prefix; | |
566 | } | |
567 | memcpy(sbi->s_volume, volume, 32); | |
568 | spin_unlock(&sbi->symlink_lock); | |
1da177e4 | 569 | |
74c41429 | 570 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
1da177e4 | 571 | return 0; |
74c41429 | 572 | |
0164b1a3 | 573 | if (*flags & MS_RDONLY) |
1da177e4 | 574 | affs_free_bitmap(sb); |
0164b1a3 | 575 | else |
1da177e4 LT |
576 | res = affs_init_bitmap(sb, flags); |
577 | ||
578 | return res; | |
579 | } | |
580 | ||
581 | static int | |
726c3342 | 582 | affs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 583 | { |
726c3342 | 584 | struct super_block *sb = dentry->d_sb; |
1da177e4 | 585 | int free; |
a6a2a73c | 586 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
1da177e4 LT |
587 | |
588 | pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size, | |
589 | AFFS_SB(sb)->s_reserved); | |
590 | ||
591 | free = affs_count_free_blocks(sb); | |
592 | buf->f_type = AFFS_SUPER_MAGIC; | |
593 | buf->f_bsize = sb->s_blocksize; | |
594 | buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved; | |
595 | buf->f_bfree = free; | |
596 | buf->f_bavail = free; | |
a6a2a73c CL |
597 | buf->f_fsid.val[0] = (u32)id; |
598 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
599 | buf->f_namelen = 30; | |
1da177e4 LT |
600 | return 0; |
601 | } | |
602 | ||
152a0836 AV |
603 | static struct dentry *affs_mount(struct file_system_type *fs_type, |
604 | int flags, const char *dev_name, void *data) | |
1da177e4 | 605 | { |
152a0836 | 606 | return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super); |
1da177e4 LT |
607 | } |
608 | ||
609 | static struct file_system_type affs_fs_type = { | |
610 | .owner = THIS_MODULE, | |
611 | .name = "affs", | |
152a0836 | 612 | .mount = affs_mount, |
1da177e4 LT |
613 | .kill_sb = kill_block_super, |
614 | .fs_flags = FS_REQUIRES_DEV, | |
615 | }; | |
616 | ||
617 | static int __init init_affs_fs(void) | |
618 | { | |
619 | int err = init_inodecache(); | |
620 | if (err) | |
621 | goto out1; | |
622 | err = register_filesystem(&affs_fs_type); | |
623 | if (err) | |
624 | goto out; | |
625 | return 0; | |
626 | out: | |
627 | destroy_inodecache(); | |
628 | out1: | |
629 | return err; | |
630 | } | |
631 | ||
632 | static void __exit exit_affs_fs(void) | |
633 | { | |
634 | unregister_filesystem(&affs_fs_type); | |
635 | destroy_inodecache(); | |
636 | } | |
637 | ||
638 | MODULE_DESCRIPTION("Amiga filesystem support for Linux"); | |
639 | MODULE_LICENSE("GPL"); | |
640 | ||
641 | module_init(init_affs_fs) | |
642 | module_exit(exit_affs_fs) |