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> | |
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> | |
e11400b0 MS |
23 | #include <linux/mount.h> |
24 | #include <linux/seq_file.h> | |
1da177e4 LT |
25 | |
26 | #include <asm/uaccess.h> | |
27 | #include <asm/system.h> | |
28 | ||
29 | #include <stdarg.h> | |
30 | ||
31 | #include "adfs.h" | |
32 | #include "dir_f.h" | |
33 | #include "dir_fplus.h" | |
34 | ||
e11400b0 MS |
35 | #define ADFS_DEFAULT_OWNER_MASK S_IRWXU |
36 | #define ADFS_DEFAULT_OTHER_MASK (S_IRWXG | S_IRWXO) | |
37 | ||
1da177e4 LT |
38 | void __adfs_error(struct super_block *sb, const char *function, const char *fmt, ...) |
39 | { | |
40 | char error_buf[128]; | |
41 | va_list args; | |
42 | ||
43 | va_start(args, fmt); | |
4a6e617a | 44 | vsnprintf(error_buf, sizeof(error_buf), fmt, args); |
1da177e4 LT |
45 | va_end(args); |
46 | ||
47 | printk(KERN_CRIT "ADFS-fs error (device %s)%s%s: %s\n", | |
48 | sb->s_id, function ? ": " : "", | |
49 | function ? function : "", error_buf); | |
50 | } | |
51 | ||
52 | static int adfs_checkdiscrecord(struct adfs_discrecord *dr) | |
53 | { | |
54 | int i; | |
55 | ||
56 | /* sector size must be 256, 512 or 1024 bytes */ | |
57 | if (dr->log2secsize != 8 && | |
58 | dr->log2secsize != 9 && | |
59 | dr->log2secsize != 10) | |
60 | return 1; | |
61 | ||
62 | /* idlen must be at least log2secsize + 3 */ | |
63 | if (dr->idlen < dr->log2secsize + 3) | |
64 | return 1; | |
65 | ||
66 | /* we cannot have such a large disc that we | |
67 | * are unable to represent sector offsets in | |
68 | * 32 bits. This works out at 2.0 TB. | |
69 | */ | |
70 | if (le32_to_cpu(dr->disc_size_high) >> dr->log2secsize) | |
71 | return 1; | |
72 | ||
73 | /* idlen must be no greater than 19 v2 [1.0] */ | |
74 | if (dr->idlen > 19) | |
75 | return 1; | |
76 | ||
77 | /* reserved bytes should be zero */ | |
78 | for (i = 0; i < sizeof(dr->unused52); i++) | |
79 | if (dr->unused52[i] != 0) | |
80 | return 1; | |
81 | ||
82 | return 0; | |
83 | } | |
84 | ||
85 | static unsigned char adfs_calczonecheck(struct super_block *sb, unsigned char *map) | |
86 | { | |
87 | unsigned int v0, v1, v2, v3; | |
88 | int i; | |
89 | ||
90 | v0 = v1 = v2 = v3 = 0; | |
91 | for (i = sb->s_blocksize - 4; i; i -= 4) { | |
92 | v0 += map[i] + (v3 >> 8); | |
93 | v3 &= 0xff; | |
94 | v1 += map[i + 1] + (v0 >> 8); | |
95 | v0 &= 0xff; | |
96 | v2 += map[i + 2] + (v1 >> 8); | |
97 | v1 &= 0xff; | |
98 | v3 += map[i + 3] + (v2 >> 8); | |
99 | v2 &= 0xff; | |
100 | } | |
101 | v0 += v3 >> 8; | |
102 | v1 += map[1] + (v0 >> 8); | |
103 | v2 += map[2] + (v1 >> 8); | |
104 | v3 += map[3] + (v2 >> 8); | |
105 | ||
106 | return v0 ^ v1 ^ v2 ^ v3; | |
107 | } | |
108 | ||
109 | static int adfs_checkmap(struct super_block *sb, struct adfs_discmap *dm) | |
110 | { | |
111 | unsigned char crosscheck = 0, zonecheck = 1; | |
112 | int i; | |
113 | ||
114 | for (i = 0; i < ADFS_SB(sb)->s_map_size; i++) { | |
115 | unsigned char *map; | |
116 | ||
117 | map = dm[i].dm_bh->b_data; | |
118 | ||
119 | if (adfs_calczonecheck(sb, map) != map[0]) { | |
120 | adfs_error(sb, "zone %d fails zonecheck", i); | |
121 | zonecheck = 0; | |
122 | } | |
123 | crosscheck ^= map[3]; | |
124 | } | |
125 | if (crosscheck != 0xff) | |
126 | adfs_error(sb, "crosscheck != 0xff"); | |
127 | return crosscheck == 0xff && zonecheck; | |
128 | } | |
129 | ||
130 | static void adfs_put_super(struct super_block *sb) | |
131 | { | |
132 | int i; | |
133 | struct adfs_sb_info *asb = ADFS_SB(sb); | |
134 | ||
135 | for (i = 0; i < asb->s_map_size; i++) | |
136 | brelse(asb->s_map[i].dm_bh); | |
137 | kfree(asb->s_map); | |
138 | kfree(asb); | |
139 | sb->s_fs_info = NULL; | |
140 | } | |
141 | ||
e11400b0 MS |
142 | static int adfs_show_options(struct seq_file *seq, struct vfsmount *mnt) |
143 | { | |
144 | struct adfs_sb_info *asb = ADFS_SB(mnt->mnt_sb); | |
145 | ||
146 | if (asb->s_uid != 0) | |
147 | seq_printf(seq, ",uid=%u", asb->s_uid); | |
148 | if (asb->s_gid != 0) | |
149 | seq_printf(seq, ",gid=%u", asb->s_gid); | |
150 | if (asb->s_owner_mask != ADFS_DEFAULT_OWNER_MASK) | |
151 | seq_printf(seq, ",ownmask=%o", asb->s_owner_mask); | |
152 | if (asb->s_other_mask != ADFS_DEFAULT_OTHER_MASK) | |
153 | seq_printf(seq, ",othmask=%o", asb->s_other_mask); | |
154 | ||
155 | return 0; | |
156 | } | |
157 | ||
1da177e4 LT |
158 | enum {Opt_uid, Opt_gid, Opt_ownmask, Opt_othmask, Opt_err}; |
159 | ||
a447c093 | 160 | static const match_table_t tokens = { |
1da177e4 LT |
161 | {Opt_uid, "uid=%u"}, |
162 | {Opt_gid, "gid=%u"}, | |
163 | {Opt_ownmask, "ownmask=%o"}, | |
164 | {Opt_othmask, "othmask=%o"}, | |
165 | {Opt_err, NULL} | |
166 | }; | |
167 | ||
168 | static int parse_options(struct super_block *sb, char *options) | |
169 | { | |
170 | char *p; | |
171 | struct adfs_sb_info *asb = ADFS_SB(sb); | |
172 | int option; | |
173 | ||
174 | if (!options) | |
175 | return 0; | |
176 | ||
177 | while ((p = strsep(&options, ",")) != NULL) { | |
178 | substring_t args[MAX_OPT_ARGS]; | |
179 | int token; | |
180 | if (!*p) | |
181 | continue; | |
182 | ||
183 | token = match_token(p, tokens, args); | |
184 | switch (token) { | |
185 | case Opt_uid: | |
186 | if (match_int(args, &option)) | |
187 | return -EINVAL; | |
188 | asb->s_uid = option; | |
189 | break; | |
190 | case Opt_gid: | |
191 | if (match_int(args, &option)) | |
192 | return -EINVAL; | |
193 | asb->s_gid = option; | |
194 | break; | |
195 | case Opt_ownmask: | |
196 | if (match_octal(args, &option)) | |
197 | return -EINVAL; | |
198 | asb->s_owner_mask = option; | |
199 | break; | |
200 | case Opt_othmask: | |
201 | if (match_octal(args, &option)) | |
202 | return -EINVAL; | |
203 | asb->s_other_mask = option; | |
204 | break; | |
205 | default: | |
206 | printk("ADFS-fs: unrecognised mount option \"%s\" " | |
207 | "or missing value\n", p); | |
208 | return -EINVAL; | |
209 | } | |
210 | } | |
211 | return 0; | |
212 | } | |
213 | ||
214 | static int adfs_remount(struct super_block *sb, int *flags, char *data) | |
215 | { | |
216 | *flags |= MS_NODIRATIME; | |
217 | return parse_options(sb, data); | |
218 | } | |
219 | ||
726c3342 | 220 | static int adfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 221 | { |
accb4012 CL |
222 | struct super_block *sb = dentry->d_sb; |
223 | struct adfs_sb_info *sbi = ADFS_SB(sb); | |
224 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); | |
1da177e4 LT |
225 | |
226 | buf->f_type = ADFS_SUPER_MAGIC; | |
accb4012 CL |
227 | buf->f_namelen = sbi->s_namelen; |
228 | buf->f_bsize = sb->s_blocksize; | |
229 | buf->f_blocks = sbi->s_size; | |
230 | buf->f_files = sbi->s_ids_per_zone * sbi->s_map_size; | |
1da177e4 | 231 | buf->f_bavail = |
accb4012 | 232 | buf->f_bfree = adfs_map_free(sb); |
1da177e4 | 233 | buf->f_ffree = (long)(buf->f_bfree * buf->f_files) / (long)buf->f_blocks; |
accb4012 CL |
234 | buf->f_fsid.val[0] = (u32)id; |
235 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
1da177e4 LT |
236 | |
237 | return 0; | |
238 | } | |
239 | ||
e18b890b | 240 | static struct kmem_cache *adfs_inode_cachep; |
1da177e4 LT |
241 | |
242 | static struct inode *adfs_alloc_inode(struct super_block *sb) | |
243 | { | |
244 | struct adfs_inode_info *ei; | |
e94b1766 | 245 | ei = (struct adfs_inode_info *)kmem_cache_alloc(adfs_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
246 | if (!ei) |
247 | return NULL; | |
248 | return &ei->vfs_inode; | |
249 | } | |
250 | ||
251 | static void adfs_destroy_inode(struct inode *inode) | |
252 | { | |
253 | kmem_cache_free(adfs_inode_cachep, ADFS_I(inode)); | |
254 | } | |
255 | ||
51cc5068 | 256 | static void init_once(void *foo) |
1da177e4 LT |
257 | { |
258 | struct adfs_inode_info *ei = (struct adfs_inode_info *) foo; | |
259 | ||
a35afb83 | 260 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 261 | } |
20c2df83 | 262 | |
1da177e4 LT |
263 | static int init_inodecache(void) |
264 | { | |
265 | adfs_inode_cachep = kmem_cache_create("adfs_inode_cache", | |
266 | sizeof(struct adfs_inode_info), | |
fffb60f9 PJ |
267 | 0, (SLAB_RECLAIM_ACCOUNT| |
268 | SLAB_MEM_SPREAD), | |
20c2df83 | 269 | init_once); |
1da177e4 LT |
270 | if (adfs_inode_cachep == NULL) |
271 | return -ENOMEM; | |
272 | return 0; | |
273 | } | |
274 | ||
275 | static void destroy_inodecache(void) | |
276 | { | |
1a1d92c1 | 277 | kmem_cache_destroy(adfs_inode_cachep); |
1da177e4 LT |
278 | } |
279 | ||
ee9b6d61 | 280 | static const struct super_operations adfs_sops = { |
1da177e4 LT |
281 | .alloc_inode = adfs_alloc_inode, |
282 | .destroy_inode = adfs_destroy_inode, | |
283 | .write_inode = adfs_write_inode, | |
284 | .put_super = adfs_put_super, | |
285 | .statfs = adfs_statfs, | |
286 | .remount_fs = adfs_remount, | |
e11400b0 | 287 | .show_options = adfs_show_options, |
1da177e4 LT |
288 | }; |
289 | ||
290 | static struct adfs_discmap *adfs_read_map(struct super_block *sb, struct adfs_discrecord *dr) | |
291 | { | |
292 | struct adfs_discmap *dm; | |
293 | unsigned int map_addr, zone_size, nzones; | |
294 | int i, zone; | |
295 | struct adfs_sb_info *asb = ADFS_SB(sb); | |
296 | ||
297 | nzones = asb->s_map_size; | |
298 | zone_size = (8 << dr->log2secsize) - le16_to_cpu(dr->zone_spare); | |
299 | map_addr = (nzones >> 1) * zone_size - | |
300 | ((nzones > 1) ? ADFS_DR_SIZE_BITS : 0); | |
301 | map_addr = signed_asl(map_addr, asb->s_map2blk); | |
302 | ||
303 | asb->s_ids_per_zone = zone_size / (asb->s_idlen + 1); | |
304 | ||
305 | dm = kmalloc(nzones * sizeof(*dm), GFP_KERNEL); | |
306 | if (dm == NULL) { | |
307 | adfs_error(sb, "not enough memory"); | |
308 | return NULL; | |
309 | } | |
310 | ||
311 | for (zone = 0; zone < nzones; zone++, map_addr++) { | |
312 | dm[zone].dm_startbit = 0; | |
313 | dm[zone].dm_endbit = zone_size; | |
314 | dm[zone].dm_startblk = zone * zone_size - ADFS_DR_SIZE_BITS; | |
315 | dm[zone].dm_bh = sb_bread(sb, map_addr); | |
316 | ||
317 | if (!dm[zone].dm_bh) { | |
318 | adfs_error(sb, "unable to read map"); | |
319 | goto error_free; | |
320 | } | |
321 | } | |
322 | ||
323 | /* adjust the limits for the first and last map zones */ | |
324 | i = zone - 1; | |
325 | dm[0].dm_startblk = 0; | |
326 | dm[0].dm_startbit = ADFS_DR_SIZE_BITS; | |
327 | dm[i].dm_endbit = (le32_to_cpu(dr->disc_size_high) << (32 - dr->log2bpmb)) + | |
328 | (le32_to_cpu(dr->disc_size) >> dr->log2bpmb) + | |
329 | (ADFS_DR_SIZE_BITS - i * zone_size); | |
330 | ||
331 | if (adfs_checkmap(sb, dm)) | |
332 | return dm; | |
333 | ||
1725cd0a | 334 | adfs_error(sb, "map corrupted"); |
1da177e4 LT |
335 | |
336 | error_free: | |
337 | while (--zone >= 0) | |
338 | brelse(dm[zone].dm_bh); | |
339 | ||
340 | kfree(dm); | |
341 | return NULL; | |
342 | } | |
343 | ||
344 | static inline unsigned long adfs_discsize(struct adfs_discrecord *dr, int block_bits) | |
345 | { | |
346 | unsigned long discsize; | |
347 | ||
348 | discsize = le32_to_cpu(dr->disc_size_high) << (32 - block_bits); | |
349 | discsize |= le32_to_cpu(dr->disc_size) >> block_bits; | |
350 | ||
351 | return discsize; | |
352 | } | |
353 | ||
354 | static int adfs_fill_super(struct super_block *sb, void *data, int silent) | |
355 | { | |
356 | struct adfs_discrecord *dr; | |
357 | struct buffer_head *bh; | |
358 | struct object_info root_obj; | |
359 | unsigned char *b_data; | |
360 | struct adfs_sb_info *asb; | |
361 | struct inode *root; | |
362 | ||
363 | sb->s_flags |= MS_NODIRATIME; | |
364 | ||
f8314dc6 | 365 | asb = kzalloc(sizeof(*asb), GFP_KERNEL); |
1da177e4 LT |
366 | if (!asb) |
367 | return -ENOMEM; | |
368 | sb->s_fs_info = asb; | |
1da177e4 LT |
369 | |
370 | /* set default options */ | |
371 | asb->s_uid = 0; | |
372 | asb->s_gid = 0; | |
e11400b0 MS |
373 | asb->s_owner_mask = ADFS_DEFAULT_OWNER_MASK; |
374 | asb->s_other_mask = ADFS_DEFAULT_OTHER_MASK; | |
1da177e4 LT |
375 | |
376 | if (parse_options(sb, data)) | |
377 | goto error; | |
378 | ||
379 | sb_set_blocksize(sb, BLOCK_SIZE); | |
380 | if (!(bh = sb_bread(sb, ADFS_DISCRECORD / BLOCK_SIZE))) { | |
381 | adfs_error(sb, "unable to read superblock"); | |
382 | goto error; | |
383 | } | |
384 | ||
385 | b_data = bh->b_data + (ADFS_DISCRECORD % BLOCK_SIZE); | |
386 | ||
387 | if (adfs_checkbblk(b_data)) { | |
388 | if (!silent) | |
389 | printk("VFS: Can't find an adfs filesystem on dev " | |
390 | "%s.\n", sb->s_id); | |
391 | goto error_free_bh; | |
392 | } | |
393 | ||
394 | dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET); | |
395 | ||
396 | /* | |
397 | * Do some sanity checks on the ADFS disc record | |
398 | */ | |
399 | if (adfs_checkdiscrecord(dr)) { | |
400 | if (!silent) | |
401 | printk("VPS: Can't find an adfs filesystem on dev " | |
402 | "%s.\n", sb->s_id); | |
403 | goto error_free_bh; | |
404 | } | |
405 | ||
406 | brelse(bh); | |
407 | if (sb_set_blocksize(sb, 1 << dr->log2secsize)) { | |
408 | bh = sb_bread(sb, ADFS_DISCRECORD / sb->s_blocksize); | |
409 | if (!bh) { | |
410 | adfs_error(sb, "couldn't read superblock on " | |
411 | "2nd try."); | |
412 | goto error; | |
413 | } | |
414 | b_data = bh->b_data + (ADFS_DISCRECORD % sb->s_blocksize); | |
415 | if (adfs_checkbblk(b_data)) { | |
416 | adfs_error(sb, "disc record mismatch, very weird!"); | |
417 | goto error_free_bh; | |
418 | } | |
419 | dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET); | |
420 | } else { | |
421 | if (!silent) | |
422 | printk(KERN_ERR "VFS: Unsupported blocksize on dev " | |
423 | "%s.\n", sb->s_id); | |
424 | goto error; | |
425 | } | |
426 | ||
427 | /* | |
428 | * blocksize on this device should now be set to the ADFS log2secsize | |
429 | */ | |
430 | ||
431 | sb->s_magic = ADFS_SUPER_MAGIC; | |
432 | asb->s_idlen = dr->idlen; | |
433 | asb->s_map_size = dr->nzones | (dr->nzones_high << 8); | |
434 | asb->s_map2blk = dr->log2bpmb - dr->log2secsize; | |
435 | asb->s_size = adfs_discsize(dr, sb->s_blocksize_bits); | |
436 | asb->s_version = dr->format_version; | |
437 | asb->s_log2sharesize = dr->log2sharesize; | |
438 | ||
439 | asb->s_map = adfs_read_map(sb, dr); | |
440 | if (!asb->s_map) | |
441 | goto error_free_bh; | |
442 | ||
443 | brelse(bh); | |
444 | ||
445 | /* | |
446 | * set up enough so that we can read an inode | |
447 | */ | |
448 | sb->s_op = &adfs_sops; | |
449 | ||
450 | dr = (struct adfs_discrecord *)(asb->s_map[0].dm_bh->b_data + 4); | |
451 | ||
452 | root_obj.parent_id = root_obj.file_id = le32_to_cpu(dr->root); | |
453 | root_obj.name_len = 0; | |
454 | root_obj.loadaddr = 0; | |
455 | root_obj.execaddr = 0; | |
456 | root_obj.size = ADFS_NEWDIR_SIZE; | |
457 | root_obj.attr = ADFS_NDA_DIRECTORY | ADFS_NDA_OWNER_READ | | |
458 | ADFS_NDA_OWNER_WRITE | ADFS_NDA_PUBLIC_READ; | |
459 | ||
460 | /* | |
461 | * If this is a F+ disk with variable length directories, | |
462 | * get the root_size from the disc record. | |
463 | */ | |
464 | if (asb->s_version) { | |
465 | root_obj.size = le32_to_cpu(dr->root_size); | |
466 | asb->s_dir = &adfs_fplus_dir_ops; | |
467 | asb->s_namelen = ADFS_FPLUS_NAME_LEN; | |
468 | } else { | |
469 | asb->s_dir = &adfs_f_dir_ops; | |
470 | asb->s_namelen = ADFS_F_NAME_LEN; | |
471 | } | |
472 | ||
473 | root = adfs_iget(sb, &root_obj); | |
474 | sb->s_root = d_alloc_root(root); | |
475 | if (!sb->s_root) { | |
476 | int i; | |
477 | iput(root); | |
478 | for (i = 0; i < asb->s_map_size; i++) | |
479 | brelse(asb->s_map[i].dm_bh); | |
480 | kfree(asb->s_map); | |
481 | adfs_error(sb, "get root inode failed\n"); | |
482 | goto error; | |
483 | } else | |
484 | sb->s_root->d_op = &adfs_dentry_operations; | |
485 | return 0; | |
486 | ||
487 | error_free_bh: | |
488 | brelse(bh); | |
489 | error: | |
490 | sb->s_fs_info = NULL; | |
491 | kfree(asb); | |
492 | return -EINVAL; | |
493 | } | |
494 | ||
454e2398 DH |
495 | static int adfs_get_sb(struct file_system_type *fs_type, |
496 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
1da177e4 | 497 | { |
454e2398 DH |
498 | return get_sb_bdev(fs_type, flags, dev_name, data, adfs_fill_super, |
499 | mnt); | |
1da177e4 LT |
500 | } |
501 | ||
502 | static struct file_system_type adfs_fs_type = { | |
503 | .owner = THIS_MODULE, | |
504 | .name = "adfs", | |
505 | .get_sb = adfs_get_sb, | |
506 | .kill_sb = kill_block_super, | |
507 | .fs_flags = FS_REQUIRES_DEV, | |
508 | }; | |
509 | ||
510 | static int __init init_adfs_fs(void) | |
511 | { | |
512 | int err = init_inodecache(); | |
513 | if (err) | |
514 | goto out1; | |
515 | err = register_filesystem(&adfs_fs_type); | |
516 | if (err) | |
517 | goto out; | |
518 | return 0; | |
519 | out: | |
520 | destroy_inodecache(); | |
521 | out1: | |
522 | return err; | |
523 | } | |
524 | ||
525 | static void __exit exit_adfs_fs(void) | |
526 | { | |
527 | unregister_filesystem(&adfs_fs_type); | |
528 | destroy_inodecache(); | |
529 | } | |
530 | ||
531 | module_init(init_adfs_fs) | |
532 | module_exit(exit_adfs_fs) |