Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/sysv/inode.c | |
3 | * | |
4 | * minix/inode.c | |
5 | * Copyright (C) 1991, 1992 Linus Torvalds | |
6 | * | |
7 | * xenix/inode.c | |
8 | * Copyright (C) 1992 Doug Evans | |
9 | * | |
10 | * coh/inode.c | |
11 | * Copyright (C) 1993 Pascal Haible, Bruno Haible | |
12 | * | |
13 | * sysv/inode.c | |
14 | * Copyright (C) 1993 Paul B. Monday | |
15 | * | |
16 | * sysv/inode.c | |
17 | * Copyright (C) 1993 Bruno Haible | |
18 | * Copyright (C) 1997, 1998 Krzysztof G. Baranowski | |
19 | * | |
20 | * This file contains code for read/parsing the superblock. | |
21 | */ | |
22 | ||
23 | #include <linux/module.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/buffer_head.h> | |
27 | #include "sysv.h" | |
28 | ||
29 | /* | |
30 | * The following functions try to recognize specific filesystems. | |
31 | * | |
32 | * We recognize: | |
33 | * - Xenix FS by its magic number. | |
34 | * - SystemV FS by its magic number. | |
35 | * - Coherent FS by its funny fname/fpack field. | |
36 | * - SCO AFS by s_nfree == 0xffff | |
37 | * - V7 FS has no distinguishing features. | |
38 | * | |
39 | * We discriminate among SystemV4 and SystemV2 FS by the assumption that | |
40 | * the time stamp is not < 01-01-1980. | |
41 | */ | |
42 | ||
43 | enum { | |
44 | JAN_1_1980 = (10*365 + 2) * 24 * 60 * 60 | |
45 | }; | |
46 | ||
47 | static void detected_xenix(struct sysv_sb_info *sbi) | |
48 | { | |
49 | struct buffer_head *bh1 = sbi->s_bh1; | |
50 | struct buffer_head *bh2 = sbi->s_bh2; | |
51 | struct xenix_super_block * sbd1; | |
52 | struct xenix_super_block * sbd2; | |
53 | ||
54 | if (bh1 != bh2) | |
55 | sbd1 = sbd2 = (struct xenix_super_block *) bh1->b_data; | |
56 | else { | |
57 | /* block size = 512, so bh1 != bh2 */ | |
58 | sbd1 = (struct xenix_super_block *) bh1->b_data; | |
59 | sbd2 = (struct xenix_super_block *) (bh2->b_data - 512); | |
60 | } | |
61 | ||
62 | sbi->s_link_max = XENIX_LINK_MAX; | |
63 | sbi->s_fic_size = XENIX_NICINOD; | |
64 | sbi->s_flc_size = XENIX_NICFREE; | |
65 | sbi->s_sbd1 = (char *)sbd1; | |
66 | sbi->s_sbd2 = (char *)sbd2; | |
67 | sbi->s_sb_fic_count = &sbd1->s_ninode; | |
68 | sbi->s_sb_fic_inodes = &sbd1->s_inode[0]; | |
69 | sbi->s_sb_total_free_inodes = &sbd2->s_tinode; | |
70 | sbi->s_bcache_count = &sbd1->s_nfree; | |
71 | sbi->s_bcache = &sbd1->s_free[0]; | |
72 | sbi->s_free_blocks = &sbd2->s_tfree; | |
73 | sbi->s_sb_time = &sbd2->s_time; | |
74 | sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd1->s_isize); | |
75 | sbi->s_nzones = fs32_to_cpu(sbi, sbd1->s_fsize); | |
76 | } | |
77 | ||
78 | static void detected_sysv4(struct sysv_sb_info *sbi) | |
79 | { | |
80 | struct sysv4_super_block * sbd; | |
81 | struct buffer_head *bh1 = sbi->s_bh1; | |
82 | struct buffer_head *bh2 = sbi->s_bh2; | |
83 | ||
84 | if (bh1 == bh2) | |
85 | sbd = (struct sysv4_super_block *) (bh1->b_data + BLOCK_SIZE/2); | |
86 | else | |
87 | sbd = (struct sysv4_super_block *) bh2->b_data; | |
88 | ||
89 | sbi->s_link_max = SYSV_LINK_MAX; | |
90 | sbi->s_fic_size = SYSV_NICINOD; | |
91 | sbi->s_flc_size = SYSV_NICFREE; | |
92 | sbi->s_sbd1 = (char *)sbd; | |
93 | sbi->s_sbd2 = (char *)sbd; | |
94 | sbi->s_sb_fic_count = &sbd->s_ninode; | |
95 | sbi->s_sb_fic_inodes = &sbd->s_inode[0]; | |
96 | sbi->s_sb_total_free_inodes = &sbd->s_tinode; | |
97 | sbi->s_bcache_count = &sbd->s_nfree; | |
98 | sbi->s_bcache = &sbd->s_free[0]; | |
99 | sbi->s_free_blocks = &sbd->s_tfree; | |
100 | sbi->s_sb_time = &sbd->s_time; | |
101 | sbi->s_sb_state = &sbd->s_state; | |
102 | sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd->s_isize); | |
103 | sbi->s_nzones = fs32_to_cpu(sbi, sbd->s_fsize); | |
104 | } | |
105 | ||
106 | static void detected_sysv2(struct sysv_sb_info *sbi) | |
107 | { | |
108 | struct sysv2_super_block *sbd; | |
109 | struct buffer_head *bh1 = sbi->s_bh1; | |
110 | struct buffer_head *bh2 = sbi->s_bh2; | |
111 | ||
112 | if (bh1 == bh2) | |
113 | sbd = (struct sysv2_super_block *) (bh1->b_data + BLOCK_SIZE/2); | |
114 | else | |
115 | sbd = (struct sysv2_super_block *) bh2->b_data; | |
116 | ||
117 | sbi->s_link_max = SYSV_LINK_MAX; | |
118 | sbi->s_fic_size = SYSV_NICINOD; | |
119 | sbi->s_flc_size = SYSV_NICFREE; | |
120 | sbi->s_sbd1 = (char *)sbd; | |
121 | sbi->s_sbd2 = (char *)sbd; | |
122 | sbi->s_sb_fic_count = &sbd->s_ninode; | |
123 | sbi->s_sb_fic_inodes = &sbd->s_inode[0]; | |
124 | sbi->s_sb_total_free_inodes = &sbd->s_tinode; | |
125 | sbi->s_bcache_count = &sbd->s_nfree; | |
126 | sbi->s_bcache = &sbd->s_free[0]; | |
127 | sbi->s_free_blocks = &sbd->s_tfree; | |
128 | sbi->s_sb_time = &sbd->s_time; | |
129 | sbi->s_sb_state = &sbd->s_state; | |
130 | sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd->s_isize); | |
131 | sbi->s_nzones = fs32_to_cpu(sbi, sbd->s_fsize); | |
132 | } | |
133 | ||
134 | static void detected_coherent(struct sysv_sb_info *sbi) | |
135 | { | |
136 | struct coh_super_block * sbd; | |
137 | struct buffer_head *bh1 = sbi->s_bh1; | |
138 | ||
139 | sbd = (struct coh_super_block *) bh1->b_data; | |
140 | ||
141 | sbi->s_link_max = COH_LINK_MAX; | |
142 | sbi->s_fic_size = COH_NICINOD; | |
143 | sbi->s_flc_size = COH_NICFREE; | |
144 | sbi->s_sbd1 = (char *)sbd; | |
145 | sbi->s_sbd2 = (char *)sbd; | |
146 | sbi->s_sb_fic_count = &sbd->s_ninode; | |
147 | sbi->s_sb_fic_inodes = &sbd->s_inode[0]; | |
148 | sbi->s_sb_total_free_inodes = &sbd->s_tinode; | |
149 | sbi->s_bcache_count = &sbd->s_nfree; | |
150 | sbi->s_bcache = &sbd->s_free[0]; | |
151 | sbi->s_free_blocks = &sbd->s_tfree; | |
152 | sbi->s_sb_time = &sbd->s_time; | |
153 | sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd->s_isize); | |
154 | sbi->s_nzones = fs32_to_cpu(sbi, sbd->s_fsize); | |
155 | } | |
156 | ||
157 | static void detected_v7(struct sysv_sb_info *sbi) | |
158 | { | |
159 | struct buffer_head *bh2 = sbi->s_bh2; | |
160 | struct v7_super_block *sbd = (struct v7_super_block *)bh2->b_data; | |
161 | ||
162 | sbi->s_link_max = V7_LINK_MAX; | |
163 | sbi->s_fic_size = V7_NICINOD; | |
164 | sbi->s_flc_size = V7_NICFREE; | |
165 | sbi->s_sbd1 = (char *)sbd; | |
166 | sbi->s_sbd2 = (char *)sbd; | |
167 | sbi->s_sb_fic_count = &sbd->s_ninode; | |
168 | sbi->s_sb_fic_inodes = &sbd->s_inode[0]; | |
169 | sbi->s_sb_total_free_inodes = &sbd->s_tinode; | |
170 | sbi->s_bcache_count = &sbd->s_nfree; | |
171 | sbi->s_bcache = &sbd->s_free[0]; | |
172 | sbi->s_free_blocks = &sbd->s_tfree; | |
173 | sbi->s_sb_time = &sbd->s_time; | |
174 | sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd->s_isize); | |
175 | sbi->s_nzones = fs32_to_cpu(sbi, sbd->s_fsize); | |
176 | } | |
177 | ||
178 | static int detect_xenix(struct sysv_sb_info *sbi, struct buffer_head *bh) | |
179 | { | |
180 | struct xenix_super_block *sbd = (struct xenix_super_block *)bh->b_data; | |
181 | if (*(__le32 *)&sbd->s_magic == cpu_to_le32(0x2b5544)) | |
182 | sbi->s_bytesex = BYTESEX_LE; | |
183 | else if (*(__be32 *)&sbd->s_magic == cpu_to_be32(0x2b5544)) | |
184 | sbi->s_bytesex = BYTESEX_BE; | |
185 | else | |
186 | return 0; | |
187 | switch (fs32_to_cpu(sbi, sbd->s_type)) { | |
188 | case 1: | |
189 | sbi->s_type = FSTYPE_XENIX; | |
190 | return 1; | |
191 | case 2: | |
192 | sbi->s_type = FSTYPE_XENIX; | |
193 | return 2; | |
194 | default: | |
195 | return 0; | |
196 | } | |
197 | } | |
198 | ||
199 | static int detect_sysv(struct sysv_sb_info *sbi, struct buffer_head *bh) | |
200 | { | |
201 | struct super_block *sb = sbi->s_sb; | |
202 | /* All relevant fields are at the same offsets in R2 and R4 */ | |
203 | struct sysv4_super_block * sbd; | |
204 | u32 type; | |
205 | ||
206 | sbd = (struct sysv4_super_block *) (bh->b_data + BLOCK_SIZE/2); | |
207 | if (*(__le32 *)&sbd->s_magic == cpu_to_le32(0xfd187e20)) | |
208 | sbi->s_bytesex = BYTESEX_LE; | |
209 | else if (*(__be32 *)&sbd->s_magic == cpu_to_be32(0xfd187e20)) | |
210 | sbi->s_bytesex = BYTESEX_BE; | |
211 | else | |
212 | return 0; | |
213 | ||
214 | type = fs32_to_cpu(sbi, sbd->s_type); | |
215 | ||
216 | if (fs16_to_cpu(sbi, sbd->s_nfree) == 0xffff) { | |
217 | sbi->s_type = FSTYPE_AFS; | |
218 | sbi->s_forced_ro = 1; | |
219 | if (!(sb->s_flags & MS_RDONLY)) { | |
220 | printk("SysV FS: SCO EAFS on %s detected, " | |
221 | "forcing read-only mode.\n", | |
222 | sb->s_id); | |
223 | } | |
224 | return type; | |
225 | } | |
226 | ||
227 | if (fs32_to_cpu(sbi, sbd->s_time) < JAN_1_1980) { | |
228 | /* this is likely to happen on SystemV2 FS */ | |
229 | if (type > 3 || type < 1) | |
230 | return 0; | |
231 | sbi->s_type = FSTYPE_SYSV2; | |
232 | return type; | |
233 | } | |
234 | if ((type > 3 || type < 1) && (type > 0x30 || type < 0x10)) | |
235 | return 0; | |
236 | ||
237 | /* On Interactive Unix (ISC) Version 4.0/3.x s_type field = 0x10, | |
238 | 0x20 or 0x30 indicates that symbolic links and the 14-character | |
239 | filename limit is gone. Due to lack of information about this | |
240 | feature read-only mode seems to be a reasonable approach... -KGB */ | |
241 | ||
242 | if (type >= 0x10) { | |
243 | printk("SysV FS: can't handle long file names on %s, " | |
244 | "forcing read-only mode.\n", sb->s_id); | |
245 | sbi->s_forced_ro = 1; | |
246 | } | |
247 | ||
248 | sbi->s_type = FSTYPE_SYSV4; | |
249 | return type >= 0x10 ? type >> 4 : type; | |
250 | } | |
251 | ||
252 | static int detect_coherent(struct sysv_sb_info *sbi, struct buffer_head *bh) | |
253 | { | |
254 | struct coh_super_block * sbd; | |
255 | ||
256 | sbd = (struct coh_super_block *) (bh->b_data + BLOCK_SIZE/2); | |
257 | if ((memcmp(sbd->s_fname,"noname",6) && memcmp(sbd->s_fname,"xxxxx ",6)) | |
258 | || (memcmp(sbd->s_fpack,"nopack",6) && memcmp(sbd->s_fpack,"xxxxx\n",6))) | |
259 | return 0; | |
260 | sbi->s_bytesex = BYTESEX_PDP; | |
261 | sbi->s_type = FSTYPE_COH; | |
262 | return 1; | |
263 | } | |
264 | ||
265 | static int detect_sysv_odd(struct sysv_sb_info *sbi, struct buffer_head *bh) | |
266 | { | |
267 | int size = detect_sysv(sbi, bh); | |
268 | ||
269 | return size>2 ? 0 : size; | |
270 | } | |
271 | ||
272 | static struct { | |
273 | int block; | |
274 | int (*test)(struct sysv_sb_info *, struct buffer_head *); | |
275 | } flavours[] = { | |
276 | {1, detect_xenix}, | |
277 | {0, detect_sysv}, | |
278 | {0, detect_coherent}, | |
279 | {9, detect_sysv_odd}, | |
280 | {15,detect_sysv_odd}, | |
281 | {18,detect_sysv}, | |
282 | }; | |
283 | ||
284 | static char *flavour_names[] = { | |
285 | [FSTYPE_XENIX] = "Xenix", | |
286 | [FSTYPE_SYSV4] = "SystemV", | |
287 | [FSTYPE_SYSV2] = "SystemV Release 2", | |
288 | [FSTYPE_COH] = "Coherent", | |
289 | [FSTYPE_V7] = "V7", | |
290 | [FSTYPE_AFS] = "AFS", | |
291 | }; | |
292 | ||
293 | static void (*flavour_setup[])(struct sysv_sb_info *) = { | |
294 | [FSTYPE_XENIX] = detected_xenix, | |
295 | [FSTYPE_SYSV4] = detected_sysv4, | |
296 | [FSTYPE_SYSV2] = detected_sysv2, | |
297 | [FSTYPE_COH] = detected_coherent, | |
298 | [FSTYPE_V7] = detected_v7, | |
299 | [FSTYPE_AFS] = detected_sysv4, | |
300 | }; | |
301 | ||
302 | static int complete_read_super(struct super_block *sb, int silent, int size) | |
303 | { | |
304 | struct sysv_sb_info *sbi = SYSV_SB(sb); | |
305 | struct inode *root_inode; | |
306 | char *found = flavour_names[sbi->s_type]; | |
307 | u_char n_bits = size+8; | |
308 | int bsize = 1 << n_bits; | |
309 | int bsize_4 = bsize >> 2; | |
310 | ||
311 | sbi->s_firstinodezone = 2; | |
312 | ||
313 | flavour_setup[sbi->s_type](sbi); | |
314 | ||
315 | sbi->s_truncate = 1; | |
316 | sbi->s_ndatazones = sbi->s_nzones - sbi->s_firstdatazone; | |
317 | sbi->s_inodes_per_block = bsize >> 6; | |
318 | sbi->s_inodes_per_block_1 = (bsize >> 6)-1; | |
319 | sbi->s_inodes_per_block_bits = n_bits-6; | |
320 | sbi->s_ind_per_block = bsize_4; | |
321 | sbi->s_ind_per_block_2 = bsize_4*bsize_4; | |
322 | sbi->s_toobig_block = 10 + bsize_4 * (1 + bsize_4 * (1 + bsize_4)); | |
323 | sbi->s_ind_per_block_bits = n_bits-2; | |
324 | ||
325 | sbi->s_ninodes = (sbi->s_firstdatazone - sbi->s_firstinodezone) | |
326 | << sbi->s_inodes_per_block_bits; | |
327 | ||
328 | if (!silent) | |
329 | printk("VFS: Found a %s FS (block size = %ld) on device %s\n", | |
330 | found, sb->s_blocksize, sb->s_id); | |
331 | ||
332 | sb->s_magic = SYSV_MAGIC_BASE + sbi->s_type; | |
333 | /* set up enough so that it can read an inode */ | |
334 | sb->s_op = &sysv_sops; | |
b8e1343f DH |
335 | root_inode = sysv_iget(sb, SYSV_ROOT_INO); |
336 | if (IS_ERR(root_inode)) { | |
1da177e4 LT |
337 | printk("SysV FS: get root inode failed\n"); |
338 | return 0; | |
339 | } | |
340 | sb->s_root = d_alloc_root(root_inode); | |
341 | if (!sb->s_root) { | |
342 | iput(root_inode); | |
343 | printk("SysV FS: get root dentry failed\n"); | |
344 | return 0; | |
345 | } | |
346 | if (sbi->s_forced_ro) | |
347 | sb->s_flags |= MS_RDONLY; | |
348 | if (sbi->s_truncate) | |
349 | sb->s_root->d_op = &sysv_dentry_operations; | |
1da177e4 LT |
350 | return 1; |
351 | } | |
352 | ||
353 | static int sysv_fill_super(struct super_block *sb, void *data, int silent) | |
354 | { | |
355 | struct buffer_head *bh1, *bh = NULL; | |
356 | struct sysv_sb_info *sbi; | |
357 | unsigned long blocknr; | |
358 | int size = 0, i; | |
359 | ||
2ecd05ae AD |
360 | BUILD_BUG_ON(1024 != sizeof (struct xenix_super_block)); |
361 | BUILD_BUG_ON(512 != sizeof (struct sysv4_super_block)); | |
362 | BUILD_BUG_ON(512 != sizeof (struct sysv2_super_block)); | |
363 | BUILD_BUG_ON(500 != sizeof (struct coh_super_block)); | |
364 | BUILD_BUG_ON(64 != sizeof (struct sysv_inode)); | |
1da177e4 | 365 | |
f8314dc6 | 366 | sbi = kzalloc(sizeof(struct sysv_sb_info), GFP_KERNEL); |
1da177e4 LT |
367 | if (!sbi) |
368 | return -ENOMEM; | |
1da177e4 LT |
369 | |
370 | sbi->s_sb = sb; | |
371 | sbi->s_block_base = 0; | |
372 | sb->s_fs_info = sbi; | |
e8c96f8c | 373 | |
1da177e4 LT |
374 | sb_set_blocksize(sb, BLOCK_SIZE); |
375 | ||
e8c96f8c | 376 | for (i = 0; i < ARRAY_SIZE(flavours) && !size; i++) { |
1da177e4 LT |
377 | brelse(bh); |
378 | bh = sb_bread(sb, flavours[i].block); | |
379 | if (!bh) | |
380 | continue; | |
381 | size = flavours[i].test(SYSV_SB(sb), bh); | |
382 | } | |
383 | ||
384 | if (!size) | |
385 | goto Eunknown; | |
386 | ||
387 | switch (size) { | |
388 | case 1: | |
389 | blocknr = bh->b_blocknr << 1; | |
390 | brelse(bh); | |
391 | sb_set_blocksize(sb, 512); | |
392 | bh1 = sb_bread(sb, blocknr); | |
393 | bh = sb_bread(sb, blocknr + 1); | |
394 | break; | |
395 | case 2: | |
396 | bh1 = bh; | |
397 | break; | |
398 | case 3: | |
399 | blocknr = bh->b_blocknr >> 1; | |
400 | brelse(bh); | |
401 | sb_set_blocksize(sb, 2048); | |
402 | bh1 = bh = sb_bread(sb, blocknr); | |
403 | break; | |
404 | default: | |
405 | goto Ebadsize; | |
406 | } | |
407 | ||
408 | if (bh && bh1) { | |
409 | sbi->s_bh1 = bh1; | |
410 | sbi->s_bh2 = bh; | |
411 | if (complete_read_super(sb, silent, size)) | |
412 | return 0; | |
413 | } | |
414 | ||
415 | brelse(bh1); | |
416 | brelse(bh); | |
417 | sb_set_blocksize(sb, BLOCK_SIZE); | |
418 | printk("oldfs: cannot read superblock\n"); | |
419 | failed: | |
420 | kfree(sbi); | |
421 | return -EINVAL; | |
422 | ||
423 | Eunknown: | |
424 | brelse(bh); | |
425 | if (!silent) | |
426 | printk("VFS: unable to find oldfs superblock on device %s\n", | |
427 | sb->s_id); | |
428 | goto failed; | |
429 | Ebadsize: | |
430 | brelse(bh); | |
431 | if (!silent) | |
432 | printk("VFS: oldfs: unsupported block size (%dKb)\n", | |
433 | 1<<(size-2)); | |
434 | goto failed; | |
435 | } | |
436 | ||
6d0b5456 | 437 | static int v7_sanity_check(struct super_block *sb, struct buffer_head *bh) |
1da177e4 | 438 | { |
1da177e4 LT |
439 | struct v7_super_block *v7sb; |
440 | struct sysv_inode *v7i; | |
6d0b5456 LR |
441 | struct buffer_head *bh2; |
442 | struct sysv_sb_info *sbi; | |
443 | ||
444 | sbi = sb->s_fs_info; | |
445 | ||
446 | /* plausibility check on superblock */ | |
447 | v7sb = (struct v7_super_block *) bh->b_data; | |
448 | if (fs16_to_cpu(sbi, v7sb->s_nfree) > V7_NICFREE || | |
449 | fs16_to_cpu(sbi, v7sb->s_ninode) > V7_NICINOD || | |
450 | fs32_to_cpu(sbi, v7sb->s_fsize) > V7_MAXSIZE) | |
451 | return 0; | |
452 | ||
453 | /* plausibility check on root inode: it is a directory, | |
454 | with a nonzero size that is a multiple of 16 */ | |
455 | bh2 = sb_bread(sb, 2); | |
456 | if (bh2 == NULL) | |
457 | return 0; | |
458 | ||
459 | v7i = (struct sysv_inode *)(bh2->b_data + 64); | |
460 | if ((fs16_to_cpu(sbi, v7i->i_mode) & ~0777) != S_IFDIR || | |
461 | (fs32_to_cpu(sbi, v7i->i_size) == 0) || | |
462 | (fs32_to_cpu(sbi, v7i->i_size) & 017) || | |
463 | (fs32_to_cpu(sbi, v7i->i_size) > V7_NFILES * | |
464 | sizeof(struct sysv_dir_entry))) { | |
465 | brelse(bh2); | |
466 | return 0; | |
467 | } | |
468 | ||
469 | brelse(bh2); | |
470 | return 1; | |
471 | } | |
472 | ||
473 | static int v7_fill_super(struct super_block *sb, void *data, int silent) | |
474 | { | |
475 | struct sysv_sb_info *sbi; | |
476 | struct buffer_head *bh; | |
1da177e4 LT |
477 | |
478 | if (440 != sizeof (struct v7_super_block)) | |
479 | panic("V7 FS: bad super-block size"); | |
480 | if (64 != sizeof (struct sysv_inode)) | |
481 | panic("sysv fs: bad i-node size"); | |
482 | ||
f8314dc6 | 483 | sbi = kzalloc(sizeof(struct sysv_sb_info), GFP_KERNEL); |
1da177e4 LT |
484 | if (!sbi) |
485 | return -ENOMEM; | |
1da177e4 LT |
486 | |
487 | sbi->s_sb = sb; | |
488 | sbi->s_block_base = 0; | |
489 | sbi->s_type = FSTYPE_V7; | |
1da177e4 LT |
490 | sb->s_fs_info = sbi; |
491 | ||
492 | sb_set_blocksize(sb, 512); | |
493 | ||
494 | if ((bh = sb_bread(sb, 1)) == NULL) { | |
495 | if (!silent) | |
496 | printk("VFS: unable to read V7 FS superblock on " | |
497 | "device %s.\n", sb->s_id); | |
498 | goto failed; | |
499 | } | |
500 | ||
6d0b5456 LR |
501 | /* Try PDP-11 UNIX */ |
502 | sbi->s_bytesex = BYTESEX_PDP; | |
503 | if (v7_sanity_check(sb, bh)) | |
504 | goto detected; | |
1da177e4 | 505 | |
6d0b5456 LR |
506 | /* Try PC/IX, v7/x86 */ |
507 | sbi->s_bytesex = BYTESEX_LE; | |
508 | if (v7_sanity_check(sb, bh)) | |
509 | goto detected; | |
1da177e4 | 510 | |
6d0b5456 LR |
511 | goto failed; |
512 | ||
513 | detected: | |
1da177e4 LT |
514 | sbi->s_bh1 = bh; |
515 | sbi->s_bh2 = bh; | |
516 | if (complete_read_super(sb, silent, 1)) | |
517 | return 0; | |
518 | ||
519 | failed: | |
6d0b5456 LR |
520 | printk(KERN_ERR "VFS: could not find a valid V7 on %s.\n", |
521 | sb->s_id); | |
1da177e4 LT |
522 | brelse(bh); |
523 | kfree(sbi); | |
524 | return -EINVAL; | |
525 | } | |
526 | ||
527 | /* Every kernel module contains stuff like this. */ | |
528 | ||
152a0836 AV |
529 | static struct dentry *sysv_mount(struct file_system_type *fs_type, |
530 | int flags, const char *dev_name, void *data) | |
1da177e4 | 531 | { |
152a0836 | 532 | return mount_bdev(fs_type, flags, dev_name, data, sysv_fill_super); |
1da177e4 LT |
533 | } |
534 | ||
152a0836 AV |
535 | static struct dentry *v7_mount(struct file_system_type *fs_type, |
536 | int flags, const char *dev_name, void *data) | |
1da177e4 | 537 | { |
152a0836 | 538 | return mount_bdev(fs_type, flags, dev_name, data, v7_fill_super); |
1da177e4 LT |
539 | } |
540 | ||
541 | static struct file_system_type sysv_fs_type = { | |
542 | .owner = THIS_MODULE, | |
543 | .name = "sysv", | |
152a0836 | 544 | .mount = sysv_mount, |
1da177e4 LT |
545 | .kill_sb = kill_block_super, |
546 | .fs_flags = FS_REQUIRES_DEV, | |
547 | }; | |
548 | ||
549 | static struct file_system_type v7_fs_type = { | |
550 | .owner = THIS_MODULE, | |
551 | .name = "v7", | |
152a0836 | 552 | .mount = v7_mount, |
1da177e4 LT |
553 | .kill_sb = kill_block_super, |
554 | .fs_flags = FS_REQUIRES_DEV, | |
555 | }; | |
556 | ||
1da177e4 LT |
557 | static int __init init_sysv_fs(void) |
558 | { | |
559 | int error; | |
560 | ||
561 | error = sysv_init_icache(); | |
562 | if (error) | |
563 | goto out; | |
564 | error = register_filesystem(&sysv_fs_type); | |
565 | if (error) | |
566 | goto destroy_icache; | |
567 | error = register_filesystem(&v7_fs_type); | |
568 | if (error) | |
569 | goto unregister; | |
570 | return 0; | |
571 | ||
572 | unregister: | |
573 | unregister_filesystem(&sysv_fs_type); | |
574 | destroy_icache: | |
575 | sysv_destroy_icache(); | |
576 | out: | |
577 | return error; | |
578 | } | |
579 | ||
580 | static void __exit exit_sysv_fs(void) | |
581 | { | |
582 | unregister_filesystem(&sysv_fs_type); | |
583 | unregister_filesystem(&v7_fs_type); | |
584 | sysv_destroy_icache(); | |
585 | } | |
586 | ||
587 | module_init(init_sysv_fs) | |
588 | module_exit(exit_sysv_fs) | |
b76212d7 | 589 | MODULE_ALIAS("v7"); |
1da177e4 | 590 | MODULE_LICENSE("GPL"); |