Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/adfs/super.c | |
3 | * | |
4 | * Copyright (C) 1997-1999 Russell King | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | #include <linux/module.h> | |
1da177e4 LT |
11 | #include <linux/init.h> |
12 | #include <linux/buffer_head.h> | |
1da177e4 | 13 | #include <linux/parser.h> |
e11400b0 MS |
14 | #include <linux/mount.h> |
15 | #include <linux/seq_file.h> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
405f5571 | 17 | #include <linux/smp_lock.h> |
608ba50b | 18 | #include <linux/statfs.h> |
1da177e4 LT |
19 | #include "adfs.h" |
20 | #include "dir_f.h" | |
21 | #include "dir_fplus.h" | |
22 | ||
e11400b0 MS |
23 | #define ADFS_DEFAULT_OWNER_MASK S_IRWXU |
24 | #define ADFS_DEFAULT_OTHER_MASK (S_IRWXG | S_IRWXO) | |
25 | ||
1da177e4 LT |
26 | void __adfs_error(struct super_block *sb, const char *function, const char *fmt, ...) |
27 | { | |
28 | char error_buf[128]; | |
29 | va_list args; | |
30 | ||
31 | va_start(args, fmt); | |
4a6e617a | 32 | vsnprintf(error_buf, sizeof(error_buf), fmt, args); |
1da177e4 LT |
33 | va_end(args); |
34 | ||
35 | printk(KERN_CRIT "ADFS-fs error (device %s)%s%s: %s\n", | |
36 | sb->s_id, function ? ": " : "", | |
37 | function ? function : "", error_buf); | |
38 | } | |
39 | ||
40 | static int adfs_checkdiscrecord(struct adfs_discrecord *dr) | |
41 | { | |
42 | int i; | |
43 | ||
44 | /* sector size must be 256, 512 or 1024 bytes */ | |
45 | if (dr->log2secsize != 8 && | |
46 | dr->log2secsize != 9 && | |
47 | dr->log2secsize != 10) | |
48 | return 1; | |
49 | ||
50 | /* idlen must be at least log2secsize + 3 */ | |
51 | if (dr->idlen < dr->log2secsize + 3) | |
52 | return 1; | |
53 | ||
54 | /* we cannot have such a large disc that we | |
55 | * are unable to represent sector offsets in | |
56 | * 32 bits. This works out at 2.0 TB. | |
57 | */ | |
58 | if (le32_to_cpu(dr->disc_size_high) >> dr->log2secsize) | |
59 | return 1; | |
60 | ||
61 | /* idlen must be no greater than 19 v2 [1.0] */ | |
62 | if (dr->idlen > 19) | |
63 | return 1; | |
64 | ||
65 | /* reserved bytes should be zero */ | |
66 | for (i = 0; i < sizeof(dr->unused52); i++) | |
67 | if (dr->unused52[i] != 0) | |
68 | return 1; | |
69 | ||
70 | return 0; | |
71 | } | |
72 | ||
73 | static unsigned char adfs_calczonecheck(struct super_block *sb, unsigned char *map) | |
74 | { | |
75 | unsigned int v0, v1, v2, v3; | |
76 | int i; | |
77 | ||
78 | v0 = v1 = v2 = v3 = 0; | |
79 | for (i = sb->s_blocksize - 4; i; i -= 4) { | |
80 | v0 += map[i] + (v3 >> 8); | |
81 | v3 &= 0xff; | |
82 | v1 += map[i + 1] + (v0 >> 8); | |
83 | v0 &= 0xff; | |
84 | v2 += map[i + 2] + (v1 >> 8); | |
85 | v1 &= 0xff; | |
86 | v3 += map[i + 3] + (v2 >> 8); | |
87 | v2 &= 0xff; | |
88 | } | |
89 | v0 += v3 >> 8; | |
90 | v1 += map[1] + (v0 >> 8); | |
91 | v2 += map[2] + (v1 >> 8); | |
92 | v3 += map[3] + (v2 >> 8); | |
93 | ||
94 | return v0 ^ v1 ^ v2 ^ v3; | |
95 | } | |
96 | ||
97 | static int adfs_checkmap(struct super_block *sb, struct adfs_discmap *dm) | |
98 | { | |
99 | unsigned char crosscheck = 0, zonecheck = 1; | |
100 | int i; | |
101 | ||
102 | for (i = 0; i < ADFS_SB(sb)->s_map_size; i++) { | |
103 | unsigned char *map; | |
104 | ||
105 | map = dm[i].dm_bh->b_data; | |
106 | ||
107 | if (adfs_calczonecheck(sb, map) != map[0]) { | |
108 | adfs_error(sb, "zone %d fails zonecheck", i); | |
109 | zonecheck = 0; | |
110 | } | |
111 | crosscheck ^= map[3]; | |
112 | } | |
113 | if (crosscheck != 0xff) | |
114 | adfs_error(sb, "crosscheck != 0xff"); | |
115 | return crosscheck == 0xff && zonecheck; | |
116 | } | |
117 | ||
118 | static void adfs_put_super(struct super_block *sb) | |
119 | { | |
120 | int i; | |
121 | struct adfs_sb_info *asb = ADFS_SB(sb); | |
122 | ||
6cfd0148 CH |
123 | lock_kernel(); |
124 | ||
1da177e4 LT |
125 | for (i = 0; i < asb->s_map_size; i++) |
126 | brelse(asb->s_map[i].dm_bh); | |
127 | kfree(asb->s_map); | |
128 | kfree(asb); | |
129 | sb->s_fs_info = NULL; | |
6cfd0148 CH |
130 | |
131 | unlock_kernel(); | |
1da177e4 LT |
132 | } |
133 | ||
e11400b0 MS |
134 | static int adfs_show_options(struct seq_file *seq, struct vfsmount *mnt) |
135 | { | |
136 | struct adfs_sb_info *asb = ADFS_SB(mnt->mnt_sb); | |
137 | ||
138 | if (asb->s_uid != 0) | |
139 | seq_printf(seq, ",uid=%u", asb->s_uid); | |
140 | if (asb->s_gid != 0) | |
141 | seq_printf(seq, ",gid=%u", asb->s_gid); | |
142 | if (asb->s_owner_mask != ADFS_DEFAULT_OWNER_MASK) | |
143 | seq_printf(seq, ",ownmask=%o", asb->s_owner_mask); | |
144 | if (asb->s_other_mask != ADFS_DEFAULT_OTHER_MASK) | |
145 | seq_printf(seq, ",othmask=%o", asb->s_other_mask); | |
146 | ||
147 | return 0; | |
148 | } | |
149 | ||
1da177e4 LT |
150 | enum {Opt_uid, Opt_gid, Opt_ownmask, Opt_othmask, Opt_err}; |
151 | ||
a447c093 | 152 | static const match_table_t tokens = { |
1da177e4 LT |
153 | {Opt_uid, "uid=%u"}, |
154 | {Opt_gid, "gid=%u"}, | |
155 | {Opt_ownmask, "ownmask=%o"}, | |
156 | {Opt_othmask, "othmask=%o"}, | |
157 | {Opt_err, NULL} | |
158 | }; | |
159 | ||
160 | static int parse_options(struct super_block *sb, char *options) | |
161 | { | |
162 | char *p; | |
163 | struct adfs_sb_info *asb = ADFS_SB(sb); | |
164 | int option; | |
165 | ||
166 | if (!options) | |
167 | return 0; | |
168 | ||
169 | while ((p = strsep(&options, ",")) != NULL) { | |
170 | substring_t args[MAX_OPT_ARGS]; | |
171 | int token; | |
172 | if (!*p) | |
173 | continue; | |
174 | ||
175 | token = match_token(p, tokens, args); | |
176 | switch (token) { | |
177 | case Opt_uid: | |
178 | if (match_int(args, &option)) | |
179 | return -EINVAL; | |
180 | asb->s_uid = option; | |
181 | break; | |
182 | case Opt_gid: | |
183 | if (match_int(args, &option)) | |
184 | return -EINVAL; | |
185 | asb->s_gid = option; | |
186 | break; | |
187 | case Opt_ownmask: | |
188 | if (match_octal(args, &option)) | |
189 | return -EINVAL; | |
190 | asb->s_owner_mask = option; | |
191 | break; | |
192 | case Opt_othmask: | |
193 | if (match_octal(args, &option)) | |
194 | return -EINVAL; | |
195 | asb->s_other_mask = option; | |
196 | break; | |
197 | default: | |
198 | printk("ADFS-fs: unrecognised mount option \"%s\" " | |
199 | "or missing value\n", p); | |
200 | return -EINVAL; | |
201 | } | |
202 | } | |
203 | return 0; | |
204 | } | |
205 | ||
206 | static int adfs_remount(struct super_block *sb, int *flags, char *data) | |
207 | { | |
208 | *flags |= MS_NODIRATIME; | |
209 | return parse_options(sb, data); | |
210 | } | |
211 | ||
726c3342 | 212 | static int adfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 213 | { |
accb4012 CL |
214 | struct super_block *sb = dentry->d_sb; |
215 | struct adfs_sb_info *sbi = ADFS_SB(sb); | |
216 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); | |
1da177e4 LT |
217 | |
218 | buf->f_type = ADFS_SUPER_MAGIC; | |
accb4012 CL |
219 | buf->f_namelen = sbi->s_namelen; |
220 | buf->f_bsize = sb->s_blocksize; | |
221 | buf->f_blocks = sbi->s_size; | |
222 | buf->f_files = sbi->s_ids_per_zone * sbi->s_map_size; | |
1da177e4 | 223 | buf->f_bavail = |
accb4012 | 224 | buf->f_bfree = adfs_map_free(sb); |
1da177e4 | 225 | buf->f_ffree = (long)(buf->f_bfree * buf->f_files) / (long)buf->f_blocks; |
accb4012 CL |
226 | buf->f_fsid.val[0] = (u32)id; |
227 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
1da177e4 LT |
228 | |
229 | return 0; | |
230 | } | |
231 | ||
e18b890b | 232 | static struct kmem_cache *adfs_inode_cachep; |
1da177e4 LT |
233 | |
234 | static struct inode *adfs_alloc_inode(struct super_block *sb) | |
235 | { | |
236 | struct adfs_inode_info *ei; | |
e94b1766 | 237 | ei = (struct adfs_inode_info *)kmem_cache_alloc(adfs_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
238 | if (!ei) |
239 | return NULL; | |
240 | return &ei->vfs_inode; | |
241 | } | |
242 | ||
fa0d7e3d | 243 | static void adfs_i_callback(struct rcu_head *head) |
1da177e4 | 244 | { |
fa0d7e3d NP |
245 | struct inode *inode = container_of(head, struct inode, i_rcu); |
246 | INIT_LIST_HEAD(&inode->i_dentry); | |
1da177e4 LT |
247 | kmem_cache_free(adfs_inode_cachep, ADFS_I(inode)); |
248 | } | |
249 | ||
fa0d7e3d NP |
250 | static void adfs_destroy_inode(struct inode *inode) |
251 | { | |
252 | call_rcu(&inode->i_rcu, adfs_i_callback); | |
253 | } | |
254 | ||
51cc5068 | 255 | static void init_once(void *foo) |
1da177e4 LT |
256 | { |
257 | struct adfs_inode_info *ei = (struct adfs_inode_info *) foo; | |
258 | ||
a35afb83 | 259 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 260 | } |
20c2df83 | 261 | |
1da177e4 LT |
262 | static int init_inodecache(void) |
263 | { | |
264 | adfs_inode_cachep = kmem_cache_create("adfs_inode_cache", | |
265 | sizeof(struct adfs_inode_info), | |
fffb60f9 PJ |
266 | 0, (SLAB_RECLAIM_ACCOUNT| |
267 | SLAB_MEM_SPREAD), | |
20c2df83 | 268 | init_once); |
1da177e4 LT |
269 | if (adfs_inode_cachep == NULL) |
270 | return -ENOMEM; | |
271 | return 0; | |
272 | } | |
273 | ||
274 | static void destroy_inodecache(void) | |
275 | { | |
1a1d92c1 | 276 | kmem_cache_destroy(adfs_inode_cachep); |
1da177e4 LT |
277 | } |
278 | ||
ee9b6d61 | 279 | static const struct super_operations adfs_sops = { |
1da177e4 LT |
280 | .alloc_inode = adfs_alloc_inode, |
281 | .destroy_inode = adfs_destroy_inode, | |
282 | .write_inode = adfs_write_inode, | |
283 | .put_super = adfs_put_super, | |
284 | .statfs = adfs_statfs, | |
285 | .remount_fs = adfs_remount, | |
e11400b0 | 286 | .show_options = adfs_show_options, |
1da177e4 LT |
287 | }; |
288 | ||
289 | static struct adfs_discmap *adfs_read_map(struct super_block *sb, struct adfs_discrecord *dr) | |
290 | { | |
291 | struct adfs_discmap *dm; | |
292 | unsigned int map_addr, zone_size, nzones; | |
293 | int i, zone; | |
294 | struct adfs_sb_info *asb = ADFS_SB(sb); | |
295 | ||
296 | nzones = asb->s_map_size; | |
297 | zone_size = (8 << dr->log2secsize) - le16_to_cpu(dr->zone_spare); | |
298 | map_addr = (nzones >> 1) * zone_size - | |
299 | ((nzones > 1) ? ADFS_DR_SIZE_BITS : 0); | |
300 | map_addr = signed_asl(map_addr, asb->s_map2blk); | |
301 | ||
302 | asb->s_ids_per_zone = zone_size / (asb->s_idlen + 1); | |
303 | ||
304 | dm = kmalloc(nzones * sizeof(*dm), GFP_KERNEL); | |
305 | if (dm == NULL) { | |
306 | adfs_error(sb, "not enough memory"); | |
307 | return NULL; | |
308 | } | |
309 | ||
310 | for (zone = 0; zone < nzones; zone++, map_addr++) { | |
311 | dm[zone].dm_startbit = 0; | |
312 | dm[zone].dm_endbit = zone_size; | |
313 | dm[zone].dm_startblk = zone * zone_size - ADFS_DR_SIZE_BITS; | |
314 | dm[zone].dm_bh = sb_bread(sb, map_addr); | |
315 | ||
316 | if (!dm[zone].dm_bh) { | |
317 | adfs_error(sb, "unable to read map"); | |
318 | goto error_free; | |
319 | } | |
320 | } | |
321 | ||
322 | /* adjust the limits for the first and last map zones */ | |
323 | i = zone - 1; | |
324 | dm[0].dm_startblk = 0; | |
325 | dm[0].dm_startbit = ADFS_DR_SIZE_BITS; | |
326 | dm[i].dm_endbit = (le32_to_cpu(dr->disc_size_high) << (32 - dr->log2bpmb)) + | |
327 | (le32_to_cpu(dr->disc_size) >> dr->log2bpmb) + | |
328 | (ADFS_DR_SIZE_BITS - i * zone_size); | |
329 | ||
330 | if (adfs_checkmap(sb, dm)) | |
331 | return dm; | |
332 | ||
1725cd0a | 333 | adfs_error(sb, "map corrupted"); |
1da177e4 LT |
334 | |
335 | error_free: | |
336 | while (--zone >= 0) | |
337 | brelse(dm[zone].dm_bh); | |
338 | ||
339 | kfree(dm); | |
340 | return NULL; | |
341 | } | |
342 | ||
343 | static inline unsigned long adfs_discsize(struct adfs_discrecord *dr, int block_bits) | |
344 | { | |
345 | unsigned long discsize; | |
346 | ||
347 | discsize = le32_to_cpu(dr->disc_size_high) << (32 - block_bits); | |
348 | discsize |= le32_to_cpu(dr->disc_size) >> block_bits; | |
349 | ||
350 | return discsize; | |
351 | } | |
352 | ||
353 | static int adfs_fill_super(struct super_block *sb, void *data, int silent) | |
354 | { | |
355 | struct adfs_discrecord *dr; | |
356 | struct buffer_head *bh; | |
357 | struct object_info root_obj; | |
358 | unsigned char *b_data; | |
359 | struct adfs_sb_info *asb; | |
360 | struct inode *root; | |
361 | ||
db719222 JB |
362 | lock_kernel(); |
363 | ||
1da177e4 LT |
364 | sb->s_flags |= MS_NODIRATIME; |
365 | ||
f8314dc6 | 366 | asb = kzalloc(sizeof(*asb), GFP_KERNEL); |
db719222 JB |
367 | if (!asb) { |
368 | unlock_kernel(); | |
1da177e4 | 369 | return -ENOMEM; |
db719222 | 370 | } |
1da177e4 | 371 | sb->s_fs_info = asb; |
1da177e4 LT |
372 | |
373 | /* set default options */ | |
374 | asb->s_uid = 0; | |
375 | asb->s_gid = 0; | |
e11400b0 MS |
376 | asb->s_owner_mask = ADFS_DEFAULT_OWNER_MASK; |
377 | asb->s_other_mask = ADFS_DEFAULT_OTHER_MASK; | |
1da177e4 LT |
378 | |
379 | if (parse_options(sb, data)) | |
380 | goto error; | |
381 | ||
382 | sb_set_blocksize(sb, BLOCK_SIZE); | |
383 | if (!(bh = sb_bread(sb, ADFS_DISCRECORD / BLOCK_SIZE))) { | |
384 | adfs_error(sb, "unable to read superblock"); | |
385 | goto error; | |
386 | } | |
387 | ||
388 | b_data = bh->b_data + (ADFS_DISCRECORD % BLOCK_SIZE); | |
389 | ||
390 | if (adfs_checkbblk(b_data)) { | |
391 | if (!silent) | |
392 | printk("VFS: Can't find an adfs filesystem on dev " | |
393 | "%s.\n", sb->s_id); | |
394 | goto error_free_bh; | |
395 | } | |
396 | ||
397 | dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET); | |
398 | ||
399 | /* | |
400 | * Do some sanity checks on the ADFS disc record | |
401 | */ | |
402 | if (adfs_checkdiscrecord(dr)) { | |
403 | if (!silent) | |
404 | printk("VPS: Can't find an adfs filesystem on dev " | |
405 | "%s.\n", sb->s_id); | |
406 | goto error_free_bh; | |
407 | } | |
408 | ||
409 | brelse(bh); | |
410 | if (sb_set_blocksize(sb, 1 << dr->log2secsize)) { | |
411 | bh = sb_bread(sb, ADFS_DISCRECORD / sb->s_blocksize); | |
412 | if (!bh) { | |
413 | adfs_error(sb, "couldn't read superblock on " | |
414 | "2nd try."); | |
415 | goto error; | |
416 | } | |
417 | b_data = bh->b_data + (ADFS_DISCRECORD % sb->s_blocksize); | |
418 | if (adfs_checkbblk(b_data)) { | |
419 | adfs_error(sb, "disc record mismatch, very weird!"); | |
420 | goto error_free_bh; | |
421 | } | |
422 | dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET); | |
423 | } else { | |
424 | if (!silent) | |
425 | printk(KERN_ERR "VFS: Unsupported blocksize on dev " | |
426 | "%s.\n", sb->s_id); | |
427 | goto error; | |
428 | } | |
429 | ||
430 | /* | |
431 | * blocksize on this device should now be set to the ADFS log2secsize | |
432 | */ | |
433 | ||
434 | sb->s_magic = ADFS_SUPER_MAGIC; | |
435 | asb->s_idlen = dr->idlen; | |
436 | asb->s_map_size = dr->nzones | (dr->nzones_high << 8); | |
437 | asb->s_map2blk = dr->log2bpmb - dr->log2secsize; | |
438 | asb->s_size = adfs_discsize(dr, sb->s_blocksize_bits); | |
439 | asb->s_version = dr->format_version; | |
440 | asb->s_log2sharesize = dr->log2sharesize; | |
441 | ||
442 | asb->s_map = adfs_read_map(sb, dr); | |
443 | if (!asb->s_map) | |
444 | goto error_free_bh; | |
445 | ||
446 | brelse(bh); | |
447 | ||
448 | /* | |
449 | * set up enough so that we can read an inode | |
450 | */ | |
451 | sb->s_op = &adfs_sops; | |
452 | ||
453 | dr = (struct adfs_discrecord *)(asb->s_map[0].dm_bh->b_data + 4); | |
454 | ||
455 | root_obj.parent_id = root_obj.file_id = le32_to_cpu(dr->root); | |
456 | root_obj.name_len = 0; | |
457 | root_obj.loadaddr = 0; | |
458 | root_obj.execaddr = 0; | |
459 | root_obj.size = ADFS_NEWDIR_SIZE; | |
460 | root_obj.attr = ADFS_NDA_DIRECTORY | ADFS_NDA_OWNER_READ | | |
461 | ADFS_NDA_OWNER_WRITE | ADFS_NDA_PUBLIC_READ; | |
462 | ||
463 | /* | |
464 | * If this is a F+ disk with variable length directories, | |
465 | * get the root_size from the disc record. | |
466 | */ | |
467 | if (asb->s_version) { | |
468 | root_obj.size = le32_to_cpu(dr->root_size); | |
469 | asb->s_dir = &adfs_fplus_dir_ops; | |
470 | asb->s_namelen = ADFS_FPLUS_NAME_LEN; | |
471 | } else { | |
472 | asb->s_dir = &adfs_f_dir_ops; | |
473 | asb->s_namelen = ADFS_F_NAME_LEN; | |
474 | } | |
475 | ||
476 | root = adfs_iget(sb, &root_obj); | |
477 | sb->s_root = d_alloc_root(root); | |
478 | if (!sb->s_root) { | |
479 | int i; | |
480 | iput(root); | |
481 | for (i = 0; i < asb->s_map_size; i++) | |
482 | brelse(asb->s_map[i].dm_bh); | |
483 | kfree(asb->s_map); | |
484 | adfs_error(sb, "get root inode failed\n"); | |
485 | goto error; | |
486 | } else | |
fb045adb | 487 | d_set_d_op(sb->s_root, &adfs_dentry_operations); |
db719222 | 488 | unlock_kernel(); |
1da177e4 LT |
489 | return 0; |
490 | ||
491 | error_free_bh: | |
492 | brelse(bh); | |
493 | error: | |
494 | sb->s_fs_info = NULL; | |
495 | kfree(asb); | |
db719222 | 496 | unlock_kernel(); |
1da177e4 LT |
497 | return -EINVAL; |
498 | } | |
499 | ||
152a0836 AV |
500 | static struct dentry *adfs_mount(struct file_system_type *fs_type, |
501 | int flags, const char *dev_name, void *data) | |
1da177e4 | 502 | { |
152a0836 | 503 | return mount_bdev(fs_type, flags, dev_name, data, adfs_fill_super); |
1da177e4 LT |
504 | } |
505 | ||
506 | static struct file_system_type adfs_fs_type = { | |
507 | .owner = THIS_MODULE, | |
508 | .name = "adfs", | |
152a0836 | 509 | .mount = adfs_mount, |
1da177e4 LT |
510 | .kill_sb = kill_block_super, |
511 | .fs_flags = FS_REQUIRES_DEV, | |
512 | }; | |
513 | ||
514 | static int __init init_adfs_fs(void) | |
515 | { | |
516 | int err = init_inodecache(); | |
517 | if (err) | |
518 | goto out1; | |
519 | err = register_filesystem(&adfs_fs_type); | |
520 | if (err) | |
521 | goto out; | |
522 | return 0; | |
523 | out: | |
524 | destroy_inodecache(); | |
525 | out1: | |
526 | return err; | |
527 | } | |
528 | ||
529 | static void __exit exit_adfs_fs(void) | |
530 | { | |
531 | unregister_filesystem(&adfs_fs_type); | |
532 | destroy_inodecache(); | |
533 | } | |
534 | ||
535 | module_init(init_adfs_fs) | |
536 | module_exit(exit_adfs_fs) | |
608ba50b | 537 | MODULE_LICENSE("GPL"); |