]>
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> | |
405f5571 | 16 | #include <linux/smp_lock.h> |
608ba50b | 17 | #include <linux/statfs.h> |
1da177e4 LT |
18 | #include "adfs.h" |
19 | #include "dir_f.h" | |
20 | #include "dir_fplus.h" | |
21 | ||
e11400b0 MS |
22 | #define ADFS_DEFAULT_OWNER_MASK S_IRWXU |
23 | #define ADFS_DEFAULT_OTHER_MASK (S_IRWXG | S_IRWXO) | |
24 | ||
1da177e4 LT |
25 | void __adfs_error(struct super_block *sb, const char *function, const char *fmt, ...) |
26 | { | |
27 | char error_buf[128]; | |
28 | va_list args; | |
29 | ||
30 | va_start(args, fmt); | |
4a6e617a | 31 | vsnprintf(error_buf, sizeof(error_buf), fmt, args); |
1da177e4 LT |
32 | va_end(args); |
33 | ||
34 | printk(KERN_CRIT "ADFS-fs error (device %s)%s%s: %s\n", | |
35 | sb->s_id, function ? ": " : "", | |
36 | function ? function : "", error_buf); | |
37 | } | |
38 | ||
39 | static int adfs_checkdiscrecord(struct adfs_discrecord *dr) | |
40 | { | |
41 | int i; | |
42 | ||
43 | /* sector size must be 256, 512 or 1024 bytes */ | |
44 | if (dr->log2secsize != 8 && | |
45 | dr->log2secsize != 9 && | |
46 | dr->log2secsize != 10) | |
47 | return 1; | |
48 | ||
49 | /* idlen must be at least log2secsize + 3 */ | |
50 | if (dr->idlen < dr->log2secsize + 3) | |
51 | return 1; | |
52 | ||
53 | /* we cannot have such a large disc that we | |
54 | * are unable to represent sector offsets in | |
55 | * 32 bits. This works out at 2.0 TB. | |
56 | */ | |
57 | if (le32_to_cpu(dr->disc_size_high) >> dr->log2secsize) | |
58 | return 1; | |
59 | ||
60 | /* idlen must be no greater than 19 v2 [1.0] */ | |
61 | if (dr->idlen > 19) | |
62 | return 1; | |
63 | ||
64 | /* reserved bytes should be zero */ | |
65 | for (i = 0; i < sizeof(dr->unused52); i++) | |
66 | if (dr->unused52[i] != 0) | |
67 | return 1; | |
68 | ||
69 | return 0; | |
70 | } | |
71 | ||
72 | static unsigned char adfs_calczonecheck(struct super_block *sb, unsigned char *map) | |
73 | { | |
74 | unsigned int v0, v1, v2, v3; | |
75 | int i; | |
76 | ||
77 | v0 = v1 = v2 = v3 = 0; | |
78 | for (i = sb->s_blocksize - 4; i; i -= 4) { | |
79 | v0 += map[i] + (v3 >> 8); | |
80 | v3 &= 0xff; | |
81 | v1 += map[i + 1] + (v0 >> 8); | |
82 | v0 &= 0xff; | |
83 | v2 += map[i + 2] + (v1 >> 8); | |
84 | v1 &= 0xff; | |
85 | v3 += map[i + 3] + (v2 >> 8); | |
86 | v2 &= 0xff; | |
87 | } | |
88 | v0 += v3 >> 8; | |
89 | v1 += map[1] + (v0 >> 8); | |
90 | v2 += map[2] + (v1 >> 8); | |
91 | v3 += map[3] + (v2 >> 8); | |
92 | ||
93 | return v0 ^ v1 ^ v2 ^ v3; | |
94 | } | |
95 | ||
96 | static int adfs_checkmap(struct super_block *sb, struct adfs_discmap *dm) | |
97 | { | |
98 | unsigned char crosscheck = 0, zonecheck = 1; | |
99 | int i; | |
100 | ||
101 | for (i = 0; i < ADFS_SB(sb)->s_map_size; i++) { | |
102 | unsigned char *map; | |
103 | ||
104 | map = dm[i].dm_bh->b_data; | |
105 | ||
106 | if (adfs_calczonecheck(sb, map) != map[0]) { | |
107 | adfs_error(sb, "zone %d fails zonecheck", i); | |
108 | zonecheck = 0; | |
109 | } | |
110 | crosscheck ^= map[3]; | |
111 | } | |
112 | if (crosscheck != 0xff) | |
113 | adfs_error(sb, "crosscheck != 0xff"); | |
114 | return crosscheck == 0xff && zonecheck; | |
115 | } | |
116 | ||
117 | static void adfs_put_super(struct super_block *sb) | |
118 | { | |
119 | int i; | |
120 | struct adfs_sb_info *asb = ADFS_SB(sb); | |
121 | ||
6cfd0148 CH |
122 | lock_kernel(); |
123 | ||
1da177e4 LT |
124 | for (i = 0; i < asb->s_map_size; i++) |
125 | brelse(asb->s_map[i].dm_bh); | |
126 | kfree(asb->s_map); | |
127 | kfree(asb); | |
128 | sb->s_fs_info = NULL; | |
6cfd0148 CH |
129 | |
130 | unlock_kernel(); | |
1da177e4 LT |
131 | } |
132 | ||
e11400b0 MS |
133 | static int adfs_show_options(struct seq_file *seq, struct vfsmount *mnt) |
134 | { | |
135 | struct adfs_sb_info *asb = ADFS_SB(mnt->mnt_sb); | |
136 | ||
137 | if (asb->s_uid != 0) | |
138 | seq_printf(seq, ",uid=%u", asb->s_uid); | |
139 | if (asb->s_gid != 0) | |
140 | seq_printf(seq, ",gid=%u", asb->s_gid); | |
141 | if (asb->s_owner_mask != ADFS_DEFAULT_OWNER_MASK) | |
142 | seq_printf(seq, ",ownmask=%o", asb->s_owner_mask); | |
143 | if (asb->s_other_mask != ADFS_DEFAULT_OTHER_MASK) | |
144 | seq_printf(seq, ",othmask=%o", asb->s_other_mask); | |
145 | ||
146 | return 0; | |
147 | } | |
148 | ||
1da177e4 LT |
149 | enum {Opt_uid, Opt_gid, Opt_ownmask, Opt_othmask, Opt_err}; |
150 | ||
a447c093 | 151 | static const match_table_t tokens = { |
1da177e4 LT |
152 | {Opt_uid, "uid=%u"}, |
153 | {Opt_gid, "gid=%u"}, | |
154 | {Opt_ownmask, "ownmask=%o"}, | |
155 | {Opt_othmask, "othmask=%o"}, | |
156 | {Opt_err, NULL} | |
157 | }; | |
158 | ||
159 | static int parse_options(struct super_block *sb, char *options) | |
160 | { | |
161 | char *p; | |
162 | struct adfs_sb_info *asb = ADFS_SB(sb); | |
163 | int option; | |
164 | ||
165 | if (!options) | |
166 | return 0; | |
167 | ||
168 | while ((p = strsep(&options, ",")) != NULL) { | |
169 | substring_t args[MAX_OPT_ARGS]; | |
170 | int token; | |
171 | if (!*p) | |
172 | continue; | |
173 | ||
174 | token = match_token(p, tokens, args); | |
175 | switch (token) { | |
176 | case Opt_uid: | |
177 | if (match_int(args, &option)) | |
178 | return -EINVAL; | |
179 | asb->s_uid = option; | |
180 | break; | |
181 | case Opt_gid: | |
182 | if (match_int(args, &option)) | |
183 | return -EINVAL; | |
184 | asb->s_gid = option; | |
185 | break; | |
186 | case Opt_ownmask: | |
187 | if (match_octal(args, &option)) | |
188 | return -EINVAL; | |
189 | asb->s_owner_mask = option; | |
190 | break; | |
191 | case Opt_othmask: | |
192 | if (match_octal(args, &option)) | |
193 | return -EINVAL; | |
194 | asb->s_other_mask = option; | |
195 | break; | |
196 | default: | |
197 | printk("ADFS-fs: unrecognised mount option \"%s\" " | |
198 | "or missing value\n", p); | |
199 | return -EINVAL; | |
200 | } | |
201 | } | |
202 | return 0; | |
203 | } | |
204 | ||
205 | static int adfs_remount(struct super_block *sb, int *flags, char *data) | |
206 | { | |
207 | *flags |= MS_NODIRATIME; | |
208 | return parse_options(sb, data); | |
209 | } | |
210 | ||
726c3342 | 211 | static int adfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 212 | { |
accb4012 CL |
213 | struct super_block *sb = dentry->d_sb; |
214 | struct adfs_sb_info *sbi = ADFS_SB(sb); | |
215 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); | |
1da177e4 LT |
216 | |
217 | buf->f_type = ADFS_SUPER_MAGIC; | |
accb4012 CL |
218 | buf->f_namelen = sbi->s_namelen; |
219 | buf->f_bsize = sb->s_blocksize; | |
220 | buf->f_blocks = sbi->s_size; | |
221 | buf->f_files = sbi->s_ids_per_zone * sbi->s_map_size; | |
1da177e4 | 222 | buf->f_bavail = |
accb4012 | 223 | buf->f_bfree = adfs_map_free(sb); |
1da177e4 | 224 | buf->f_ffree = (long)(buf->f_bfree * buf->f_files) / (long)buf->f_blocks; |
accb4012 CL |
225 | buf->f_fsid.val[0] = (u32)id; |
226 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
1da177e4 LT |
227 | |
228 | return 0; | |
229 | } | |
230 | ||
e18b890b | 231 | static struct kmem_cache *adfs_inode_cachep; |
1da177e4 LT |
232 | |
233 | static struct inode *adfs_alloc_inode(struct super_block *sb) | |
234 | { | |
235 | struct adfs_inode_info *ei; | |
e94b1766 | 236 | ei = (struct adfs_inode_info *)kmem_cache_alloc(adfs_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
237 | if (!ei) |
238 | return NULL; | |
239 | return &ei->vfs_inode; | |
240 | } | |
241 | ||
242 | static void adfs_destroy_inode(struct inode *inode) | |
243 | { | |
244 | kmem_cache_free(adfs_inode_cachep, ADFS_I(inode)); | |
245 | } | |
246 | ||
51cc5068 | 247 | static void init_once(void *foo) |
1da177e4 LT |
248 | { |
249 | struct adfs_inode_info *ei = (struct adfs_inode_info *) foo; | |
250 | ||
a35afb83 | 251 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 252 | } |
20c2df83 | 253 | |
1da177e4 LT |
254 | static int init_inodecache(void) |
255 | { | |
256 | adfs_inode_cachep = kmem_cache_create("adfs_inode_cache", | |
257 | sizeof(struct adfs_inode_info), | |
fffb60f9 PJ |
258 | 0, (SLAB_RECLAIM_ACCOUNT| |
259 | SLAB_MEM_SPREAD), | |
20c2df83 | 260 | init_once); |
1da177e4 LT |
261 | if (adfs_inode_cachep == NULL) |
262 | return -ENOMEM; | |
263 | return 0; | |
264 | } | |
265 | ||
266 | static void destroy_inodecache(void) | |
267 | { | |
1a1d92c1 | 268 | kmem_cache_destroy(adfs_inode_cachep); |
1da177e4 LT |
269 | } |
270 | ||
ee9b6d61 | 271 | static const struct super_operations adfs_sops = { |
1da177e4 LT |
272 | .alloc_inode = adfs_alloc_inode, |
273 | .destroy_inode = adfs_destroy_inode, | |
274 | .write_inode = adfs_write_inode, | |
275 | .put_super = adfs_put_super, | |
276 | .statfs = adfs_statfs, | |
277 | .remount_fs = adfs_remount, | |
e11400b0 | 278 | .show_options = adfs_show_options, |
1da177e4 LT |
279 | }; |
280 | ||
281 | static struct adfs_discmap *adfs_read_map(struct super_block *sb, struct adfs_discrecord *dr) | |
282 | { | |
283 | struct adfs_discmap *dm; | |
284 | unsigned int map_addr, zone_size, nzones; | |
285 | int i, zone; | |
286 | struct adfs_sb_info *asb = ADFS_SB(sb); | |
287 | ||
288 | nzones = asb->s_map_size; | |
289 | zone_size = (8 << dr->log2secsize) - le16_to_cpu(dr->zone_spare); | |
290 | map_addr = (nzones >> 1) * zone_size - | |
291 | ((nzones > 1) ? ADFS_DR_SIZE_BITS : 0); | |
292 | map_addr = signed_asl(map_addr, asb->s_map2blk); | |
293 | ||
294 | asb->s_ids_per_zone = zone_size / (asb->s_idlen + 1); | |
295 | ||
296 | dm = kmalloc(nzones * sizeof(*dm), GFP_KERNEL); | |
297 | if (dm == NULL) { | |
298 | adfs_error(sb, "not enough memory"); | |
299 | return NULL; | |
300 | } | |
301 | ||
302 | for (zone = 0; zone < nzones; zone++, map_addr++) { | |
303 | dm[zone].dm_startbit = 0; | |
304 | dm[zone].dm_endbit = zone_size; | |
305 | dm[zone].dm_startblk = zone * zone_size - ADFS_DR_SIZE_BITS; | |
306 | dm[zone].dm_bh = sb_bread(sb, map_addr); | |
307 | ||
308 | if (!dm[zone].dm_bh) { | |
309 | adfs_error(sb, "unable to read map"); | |
310 | goto error_free; | |
311 | } | |
312 | } | |
313 | ||
314 | /* adjust the limits for the first and last map zones */ | |
315 | i = zone - 1; | |
316 | dm[0].dm_startblk = 0; | |
317 | dm[0].dm_startbit = ADFS_DR_SIZE_BITS; | |
318 | dm[i].dm_endbit = (le32_to_cpu(dr->disc_size_high) << (32 - dr->log2bpmb)) + | |
319 | (le32_to_cpu(dr->disc_size) >> dr->log2bpmb) + | |
320 | (ADFS_DR_SIZE_BITS - i * zone_size); | |
321 | ||
322 | if (adfs_checkmap(sb, dm)) | |
323 | return dm; | |
324 | ||
1725cd0a | 325 | adfs_error(sb, "map corrupted"); |
1da177e4 LT |
326 | |
327 | error_free: | |
328 | while (--zone >= 0) | |
329 | brelse(dm[zone].dm_bh); | |
330 | ||
331 | kfree(dm); | |
332 | return NULL; | |
333 | } | |
334 | ||
335 | static inline unsigned long adfs_discsize(struct adfs_discrecord *dr, int block_bits) | |
336 | { | |
337 | unsigned long discsize; | |
338 | ||
339 | discsize = le32_to_cpu(dr->disc_size_high) << (32 - block_bits); | |
340 | discsize |= le32_to_cpu(dr->disc_size) >> block_bits; | |
341 | ||
342 | return discsize; | |
343 | } | |
344 | ||
345 | static int adfs_fill_super(struct super_block *sb, void *data, int silent) | |
346 | { | |
347 | struct adfs_discrecord *dr; | |
348 | struct buffer_head *bh; | |
349 | struct object_info root_obj; | |
350 | unsigned char *b_data; | |
351 | struct adfs_sb_info *asb; | |
352 | struct inode *root; | |
353 | ||
354 | sb->s_flags |= MS_NODIRATIME; | |
355 | ||
f8314dc6 | 356 | asb = kzalloc(sizeof(*asb), GFP_KERNEL); |
1da177e4 LT |
357 | if (!asb) |
358 | return -ENOMEM; | |
359 | sb->s_fs_info = asb; | |
1da177e4 LT |
360 | |
361 | /* set default options */ | |
362 | asb->s_uid = 0; | |
363 | asb->s_gid = 0; | |
e11400b0 MS |
364 | asb->s_owner_mask = ADFS_DEFAULT_OWNER_MASK; |
365 | asb->s_other_mask = ADFS_DEFAULT_OTHER_MASK; | |
1da177e4 LT |
366 | |
367 | if (parse_options(sb, data)) | |
368 | goto error; | |
369 | ||
370 | sb_set_blocksize(sb, BLOCK_SIZE); | |
371 | if (!(bh = sb_bread(sb, ADFS_DISCRECORD / BLOCK_SIZE))) { | |
372 | adfs_error(sb, "unable to read superblock"); | |
373 | goto error; | |
374 | } | |
375 | ||
376 | b_data = bh->b_data + (ADFS_DISCRECORD % BLOCK_SIZE); | |
377 | ||
378 | if (adfs_checkbblk(b_data)) { | |
379 | if (!silent) | |
380 | printk("VFS: Can't find an adfs filesystem on dev " | |
381 | "%s.\n", sb->s_id); | |
382 | goto error_free_bh; | |
383 | } | |
384 | ||
385 | dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET); | |
386 | ||
387 | /* | |
388 | * Do some sanity checks on the ADFS disc record | |
389 | */ | |
390 | if (adfs_checkdiscrecord(dr)) { | |
391 | if (!silent) | |
392 | printk("VPS: Can't find an adfs filesystem on dev " | |
393 | "%s.\n", sb->s_id); | |
394 | goto error_free_bh; | |
395 | } | |
396 | ||
397 | brelse(bh); | |
398 | if (sb_set_blocksize(sb, 1 << dr->log2secsize)) { | |
399 | bh = sb_bread(sb, ADFS_DISCRECORD / sb->s_blocksize); | |
400 | if (!bh) { | |
401 | adfs_error(sb, "couldn't read superblock on " | |
402 | "2nd try."); | |
403 | goto error; | |
404 | } | |
405 | b_data = bh->b_data + (ADFS_DISCRECORD % sb->s_blocksize); | |
406 | if (adfs_checkbblk(b_data)) { | |
407 | adfs_error(sb, "disc record mismatch, very weird!"); | |
408 | goto error_free_bh; | |
409 | } | |
410 | dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET); | |
411 | } else { | |
412 | if (!silent) | |
413 | printk(KERN_ERR "VFS: Unsupported blocksize on dev " | |
414 | "%s.\n", sb->s_id); | |
415 | goto error; | |
416 | } | |
417 | ||
418 | /* | |
419 | * blocksize on this device should now be set to the ADFS log2secsize | |
420 | */ | |
421 | ||
422 | sb->s_magic = ADFS_SUPER_MAGIC; | |
423 | asb->s_idlen = dr->idlen; | |
424 | asb->s_map_size = dr->nzones | (dr->nzones_high << 8); | |
425 | asb->s_map2blk = dr->log2bpmb - dr->log2secsize; | |
426 | asb->s_size = adfs_discsize(dr, sb->s_blocksize_bits); | |
427 | asb->s_version = dr->format_version; | |
428 | asb->s_log2sharesize = dr->log2sharesize; | |
429 | ||
430 | asb->s_map = adfs_read_map(sb, dr); | |
431 | if (!asb->s_map) | |
432 | goto error_free_bh; | |
433 | ||
434 | brelse(bh); | |
435 | ||
436 | /* | |
437 | * set up enough so that we can read an inode | |
438 | */ | |
439 | sb->s_op = &adfs_sops; | |
440 | ||
441 | dr = (struct adfs_discrecord *)(asb->s_map[0].dm_bh->b_data + 4); | |
442 | ||
443 | root_obj.parent_id = root_obj.file_id = le32_to_cpu(dr->root); | |
444 | root_obj.name_len = 0; | |
445 | root_obj.loadaddr = 0; | |
446 | root_obj.execaddr = 0; | |
447 | root_obj.size = ADFS_NEWDIR_SIZE; | |
448 | root_obj.attr = ADFS_NDA_DIRECTORY | ADFS_NDA_OWNER_READ | | |
449 | ADFS_NDA_OWNER_WRITE | ADFS_NDA_PUBLIC_READ; | |
450 | ||
451 | /* | |
452 | * If this is a F+ disk with variable length directories, | |
453 | * get the root_size from the disc record. | |
454 | */ | |
455 | if (asb->s_version) { | |
456 | root_obj.size = le32_to_cpu(dr->root_size); | |
457 | asb->s_dir = &adfs_fplus_dir_ops; | |
458 | asb->s_namelen = ADFS_FPLUS_NAME_LEN; | |
459 | } else { | |
460 | asb->s_dir = &adfs_f_dir_ops; | |
461 | asb->s_namelen = ADFS_F_NAME_LEN; | |
462 | } | |
463 | ||
464 | root = adfs_iget(sb, &root_obj); | |
465 | sb->s_root = d_alloc_root(root); | |
466 | if (!sb->s_root) { | |
467 | int i; | |
468 | iput(root); | |
469 | for (i = 0; i < asb->s_map_size; i++) | |
470 | brelse(asb->s_map[i].dm_bh); | |
471 | kfree(asb->s_map); | |
472 | adfs_error(sb, "get root inode failed\n"); | |
473 | goto error; | |
474 | } else | |
475 | sb->s_root->d_op = &adfs_dentry_operations; | |
476 | return 0; | |
477 | ||
478 | error_free_bh: | |
479 | brelse(bh); | |
480 | error: | |
481 | sb->s_fs_info = NULL; | |
482 | kfree(asb); | |
483 | return -EINVAL; | |
484 | } | |
485 | ||
454e2398 DH |
486 | static int adfs_get_sb(struct file_system_type *fs_type, |
487 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
1da177e4 | 488 | { |
454e2398 DH |
489 | return get_sb_bdev(fs_type, flags, dev_name, data, adfs_fill_super, |
490 | mnt); | |
1da177e4 LT |
491 | } |
492 | ||
493 | static struct file_system_type adfs_fs_type = { | |
494 | .owner = THIS_MODULE, | |
495 | .name = "adfs", | |
496 | .get_sb = adfs_get_sb, | |
497 | .kill_sb = kill_block_super, | |
498 | .fs_flags = FS_REQUIRES_DEV, | |
499 | }; | |
500 | ||
501 | static int __init init_adfs_fs(void) | |
502 | { | |
503 | int err = init_inodecache(); | |
504 | if (err) | |
505 | goto out1; | |
506 | err = register_filesystem(&adfs_fs_type); | |
507 | if (err) | |
508 | goto out; | |
509 | return 0; | |
510 | out: | |
511 | destroy_inodecache(); | |
512 | out1: | |
513 | return err; | |
514 | } | |
515 | ||
516 | static void __exit exit_adfs_fs(void) | |
517 | { | |
518 | unregister_filesystem(&adfs_fs_type); | |
519 | destroy_inodecache(); | |
520 | } | |
521 | ||
522 | module_init(init_adfs_fs) | |
523 | module_exit(exit_adfs_fs) | |
608ba50b | 524 | MODULE_LICENSE("GPL"); |