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