Commit | Line | Data |
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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * linux/fs/sysv/inode.c | |
4 | * | |
5 | * minix/inode.c | |
6 | * Copyright (C) 1991, 1992 Linus Torvalds | |
7 | * | |
8 | * xenix/inode.c | |
9 | * Copyright (C) 1992 Doug Evans | |
10 | * | |
11 | * coh/inode.c | |
12 | * Copyright (C) 1993 Pascal Haible, Bruno Haible | |
13 | * | |
14 | * sysv/inode.c | |
15 | * Copyright (C) 1993 Paul B. Monday | |
16 | * | |
17 | * sysv/inode.c | |
18 | * Copyright (C) 1993 Bruno Haible | |
19 | * Copyright (C) 1997, 1998 Krzysztof G. Baranowski | |
20 | * | |
21 | * This file contains code for read/parsing the superblock. | |
22 | */ | |
23 | ||
24 | #include <linux/module.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/buffer_head.h> | |
28 | #include "sysv.h" | |
29 | ||
30 | /* | |
31 | * The following functions try to recognize specific filesystems. | |
32 | * | |
33 | * We recognize: | |
34 | * - Xenix FS by its magic number. | |
35 | * - SystemV FS by its magic number. | |
36 | * - Coherent FS by its funny fname/fpack field. | |
37 | * - SCO AFS by s_nfree == 0xffff | |
38 | * - V7 FS has no distinguishing features. | |
39 | * | |
40 | * We discriminate among SystemV4 and SystemV2 FS by the assumption that | |
41 | * the time stamp is not < 01-01-1980. | |
42 | */ | |
43 | ||
44 | enum { | |
45 | JAN_1_1980 = (10*365 + 2) * 24 * 60 * 60 | |
46 | }; | |
47 | ||
8de52778 | 48 | static void detected_xenix(struct sysv_sb_info *sbi, unsigned *max_links) |
1da177e4 LT |
49 | { |
50 | struct buffer_head *bh1 = sbi->s_bh1; | |
51 | struct buffer_head *bh2 = sbi->s_bh2; | |
52 | struct xenix_super_block * sbd1; | |
53 | struct xenix_super_block * sbd2; | |
54 | ||
55 | if (bh1 != bh2) | |
56 | sbd1 = sbd2 = (struct xenix_super_block *) bh1->b_data; | |
57 | else { | |
58 | /* block size = 512, so bh1 != bh2 */ | |
59 | sbd1 = (struct xenix_super_block *) bh1->b_data; | |
60 | sbd2 = (struct xenix_super_block *) (bh2->b_data - 512); | |
61 | } | |
62 | ||
8de52778 | 63 | *max_links = XENIX_LINK_MAX; |
1da177e4 LT |
64 | sbi->s_fic_size = XENIX_NICINOD; |
65 | sbi->s_flc_size = XENIX_NICFREE; | |
66 | sbi->s_sbd1 = (char *)sbd1; | |
67 | sbi->s_sbd2 = (char *)sbd2; | |
68 | sbi->s_sb_fic_count = &sbd1->s_ninode; | |
69 | sbi->s_sb_fic_inodes = &sbd1->s_inode[0]; | |
70 | sbi->s_sb_total_free_inodes = &sbd2->s_tinode; | |
71 | sbi->s_bcache_count = &sbd1->s_nfree; | |
72 | sbi->s_bcache = &sbd1->s_free[0]; | |
73 | sbi->s_free_blocks = &sbd2->s_tfree; | |
74 | sbi->s_sb_time = &sbd2->s_time; | |
75 | sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd1->s_isize); | |
76 | sbi->s_nzones = fs32_to_cpu(sbi, sbd1->s_fsize); | |
77 | } | |
78 | ||
8de52778 | 79 | static void detected_sysv4(struct sysv_sb_info *sbi, unsigned *max_links) |
1da177e4 LT |
80 | { |
81 | struct sysv4_super_block * sbd; | |
82 | struct buffer_head *bh1 = sbi->s_bh1; | |
83 | struct buffer_head *bh2 = sbi->s_bh2; | |
84 | ||
85 | if (bh1 == bh2) | |
86 | sbd = (struct sysv4_super_block *) (bh1->b_data + BLOCK_SIZE/2); | |
87 | else | |
88 | sbd = (struct sysv4_super_block *) bh2->b_data; | |
89 | ||
8de52778 | 90 | *max_links = SYSV_LINK_MAX; |
1da177e4 LT |
91 | sbi->s_fic_size = SYSV_NICINOD; |
92 | sbi->s_flc_size = SYSV_NICFREE; | |
93 | sbi->s_sbd1 = (char *)sbd; | |
94 | sbi->s_sbd2 = (char *)sbd; | |
95 | sbi->s_sb_fic_count = &sbd->s_ninode; | |
96 | sbi->s_sb_fic_inodes = &sbd->s_inode[0]; | |
97 | sbi->s_sb_total_free_inodes = &sbd->s_tinode; | |
98 | sbi->s_bcache_count = &sbd->s_nfree; | |
99 | sbi->s_bcache = &sbd->s_free[0]; | |
100 | sbi->s_free_blocks = &sbd->s_tfree; | |
101 | sbi->s_sb_time = &sbd->s_time; | |
102 | sbi->s_sb_state = &sbd->s_state; | |
103 | sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd->s_isize); | |
104 | sbi->s_nzones = fs32_to_cpu(sbi, sbd->s_fsize); | |
105 | } | |
106 | ||
8de52778 | 107 | static void detected_sysv2(struct sysv_sb_info *sbi, unsigned *max_links) |
1da177e4 LT |
108 | { |
109 | struct sysv2_super_block *sbd; | |
110 | struct buffer_head *bh1 = sbi->s_bh1; | |
111 | struct buffer_head *bh2 = sbi->s_bh2; | |
112 | ||
113 | if (bh1 == bh2) | |
114 | sbd = (struct sysv2_super_block *) (bh1->b_data + BLOCK_SIZE/2); | |
115 | else | |
116 | sbd = (struct sysv2_super_block *) bh2->b_data; | |
117 | ||
8de52778 | 118 | *max_links = SYSV_LINK_MAX; |
1da177e4 LT |
119 | sbi->s_fic_size = SYSV_NICINOD; |
120 | sbi->s_flc_size = SYSV_NICFREE; | |
121 | sbi->s_sbd1 = (char *)sbd; | |
122 | sbi->s_sbd2 = (char *)sbd; | |
123 | sbi->s_sb_fic_count = &sbd->s_ninode; | |
124 | sbi->s_sb_fic_inodes = &sbd->s_inode[0]; | |
125 | sbi->s_sb_total_free_inodes = &sbd->s_tinode; | |
126 | sbi->s_bcache_count = &sbd->s_nfree; | |
127 | sbi->s_bcache = &sbd->s_free[0]; | |
128 | sbi->s_free_blocks = &sbd->s_tfree; | |
129 | sbi->s_sb_time = &sbd->s_time; | |
130 | sbi->s_sb_state = &sbd->s_state; | |
131 | sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd->s_isize); | |
132 | sbi->s_nzones = fs32_to_cpu(sbi, sbd->s_fsize); | |
133 | } | |
134 | ||
8de52778 | 135 | static void detected_coherent(struct sysv_sb_info *sbi, unsigned *max_links) |
1da177e4 LT |
136 | { |
137 | struct coh_super_block * sbd; | |
138 | struct buffer_head *bh1 = sbi->s_bh1; | |
139 | ||
140 | sbd = (struct coh_super_block *) bh1->b_data; | |
141 | ||
8de52778 | 142 | *max_links = COH_LINK_MAX; |
1da177e4 LT |
143 | sbi->s_fic_size = COH_NICINOD; |
144 | sbi->s_flc_size = COH_NICFREE; | |
145 | sbi->s_sbd1 = (char *)sbd; | |
146 | sbi->s_sbd2 = (char *)sbd; | |
147 | sbi->s_sb_fic_count = &sbd->s_ninode; | |
148 | sbi->s_sb_fic_inodes = &sbd->s_inode[0]; | |
149 | sbi->s_sb_total_free_inodes = &sbd->s_tinode; | |
150 | sbi->s_bcache_count = &sbd->s_nfree; | |
151 | sbi->s_bcache = &sbd->s_free[0]; | |
152 | sbi->s_free_blocks = &sbd->s_tfree; | |
153 | sbi->s_sb_time = &sbd->s_time; | |
154 | sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd->s_isize); | |
155 | sbi->s_nzones = fs32_to_cpu(sbi, sbd->s_fsize); | |
156 | } | |
157 | ||
8de52778 | 158 | static void detected_v7(struct sysv_sb_info *sbi, unsigned *max_links) |
1da177e4 LT |
159 | { |
160 | struct buffer_head *bh2 = sbi->s_bh2; | |
161 | struct v7_super_block *sbd = (struct v7_super_block *)bh2->b_data; | |
162 | ||
8de52778 | 163 | *max_links = V7_LINK_MAX; |
1da177e4 LT |
164 | sbi->s_fic_size = V7_NICINOD; |
165 | sbi->s_flc_size = V7_NICFREE; | |
166 | sbi->s_sbd1 = (char *)sbd; | |
167 | sbi->s_sbd2 = (char *)sbd; | |
168 | sbi->s_sb_fic_count = &sbd->s_ninode; | |
169 | sbi->s_sb_fic_inodes = &sbd->s_inode[0]; | |
170 | sbi->s_sb_total_free_inodes = &sbd->s_tinode; | |
171 | sbi->s_bcache_count = &sbd->s_nfree; | |
172 | sbi->s_bcache = &sbd->s_free[0]; | |
173 | sbi->s_free_blocks = &sbd->s_tfree; | |
174 | sbi->s_sb_time = &sbd->s_time; | |
175 | sbi->s_firstdatazone = fs16_to_cpu(sbi, sbd->s_isize); | |
176 | sbi->s_nzones = fs32_to_cpu(sbi, sbd->s_fsize); | |
177 | } | |
178 | ||
179 | static int detect_xenix(struct sysv_sb_info *sbi, struct buffer_head *bh) | |
180 | { | |
181 | struct xenix_super_block *sbd = (struct xenix_super_block *)bh->b_data; | |
182 | if (*(__le32 *)&sbd->s_magic == cpu_to_le32(0x2b5544)) | |
183 | sbi->s_bytesex = BYTESEX_LE; | |
184 | else if (*(__be32 *)&sbd->s_magic == cpu_to_be32(0x2b5544)) | |
185 | sbi->s_bytesex = BYTESEX_BE; | |
186 | else | |
187 | return 0; | |
188 | switch (fs32_to_cpu(sbi, sbd->s_type)) { | |
189 | case 1: | |
190 | sbi->s_type = FSTYPE_XENIX; | |
191 | return 1; | |
192 | case 2: | |
193 | sbi->s_type = FSTYPE_XENIX; | |
194 | return 2; | |
195 | default: | |
196 | return 0; | |
197 | } | |
198 | } | |
199 | ||
200 | static int detect_sysv(struct sysv_sb_info *sbi, struct buffer_head *bh) | |
201 | { | |
202 | struct super_block *sb = sbi->s_sb; | |
203 | /* All relevant fields are at the same offsets in R2 and R4 */ | |
204 | struct sysv4_super_block * sbd; | |
205 | u32 type; | |
206 | ||
207 | sbd = (struct sysv4_super_block *) (bh->b_data + BLOCK_SIZE/2); | |
208 | if (*(__le32 *)&sbd->s_magic == cpu_to_le32(0xfd187e20)) | |
209 | sbi->s_bytesex = BYTESEX_LE; | |
210 | else if (*(__be32 *)&sbd->s_magic == cpu_to_be32(0xfd187e20)) | |
211 | sbi->s_bytesex = BYTESEX_BE; | |
212 | else | |
213 | return 0; | |
214 | ||
215 | type = fs32_to_cpu(sbi, sbd->s_type); | |
216 | ||
217 | if (fs16_to_cpu(sbi, sbd->s_nfree) == 0xffff) { | |
218 | sbi->s_type = FSTYPE_AFS; | |
219 | sbi->s_forced_ro = 1; | |
bc98a42c | 220 | if (!sb_rdonly(sb)) { |
1da177e4 LT |
221 | printk("SysV FS: SCO EAFS on %s detected, " |
222 | "forcing read-only mode.\n", | |
223 | sb->s_id); | |
224 | } | |
225 | return type; | |
226 | } | |
227 | ||
228 | if (fs32_to_cpu(sbi, sbd->s_time) < JAN_1_1980) { | |
229 | /* this is likely to happen on SystemV2 FS */ | |
230 | if (type > 3 || type < 1) | |
231 | return 0; | |
232 | sbi->s_type = FSTYPE_SYSV2; | |
233 | return type; | |
234 | } | |
235 | if ((type > 3 || type < 1) && (type > 0x30 || type < 0x10)) | |
236 | return 0; | |
237 | ||
238 | /* On Interactive Unix (ISC) Version 4.0/3.x s_type field = 0x10, | |
239 | 0x20 or 0x30 indicates that symbolic links and the 14-character | |
240 | filename limit is gone. Due to lack of information about this | |
241 | feature read-only mode seems to be a reasonable approach... -KGB */ | |
242 | ||
243 | if (type >= 0x10) { | |
244 | printk("SysV FS: can't handle long file names on %s, " | |
245 | "forcing read-only mode.\n", sb->s_id); | |
246 | sbi->s_forced_ro = 1; | |
247 | } | |
248 | ||
249 | sbi->s_type = FSTYPE_SYSV4; | |
250 | return type >= 0x10 ? type >> 4 : type; | |
251 | } | |
252 | ||
253 | static int detect_coherent(struct sysv_sb_info *sbi, struct buffer_head *bh) | |
254 | { | |
255 | struct coh_super_block * sbd; | |
256 | ||
257 | sbd = (struct coh_super_block *) (bh->b_data + BLOCK_SIZE/2); | |
258 | if ((memcmp(sbd->s_fname,"noname",6) && memcmp(sbd->s_fname,"xxxxx ",6)) | |
259 | || (memcmp(sbd->s_fpack,"nopack",6) && memcmp(sbd->s_fpack,"xxxxx\n",6))) | |
260 | return 0; | |
261 | sbi->s_bytesex = BYTESEX_PDP; | |
262 | sbi->s_type = FSTYPE_COH; | |
263 | return 1; | |
264 | } | |
265 | ||
266 | static int detect_sysv_odd(struct sysv_sb_info *sbi, struct buffer_head *bh) | |
267 | { | |
268 | int size = detect_sysv(sbi, bh); | |
269 | ||
270 | return size>2 ? 0 : size; | |
271 | } | |
272 | ||
273 | static struct { | |
274 | int block; | |
275 | int (*test)(struct sysv_sb_info *, struct buffer_head *); | |
276 | } flavours[] = { | |
277 | {1, detect_xenix}, | |
278 | {0, detect_sysv}, | |
279 | {0, detect_coherent}, | |
280 | {9, detect_sysv_odd}, | |
281 | {15,detect_sysv_odd}, | |
282 | {18,detect_sysv}, | |
283 | }; | |
284 | ||
285 | static char *flavour_names[] = { | |
286 | [FSTYPE_XENIX] = "Xenix", | |
287 | [FSTYPE_SYSV4] = "SystemV", | |
288 | [FSTYPE_SYSV2] = "SystemV Release 2", | |
289 | [FSTYPE_COH] = "Coherent", | |
290 | [FSTYPE_V7] = "V7", | |
291 | [FSTYPE_AFS] = "AFS", | |
292 | }; | |
293 | ||
8de52778 | 294 | static void (*flavour_setup[])(struct sysv_sb_info *, unsigned *) = { |
1da177e4 LT |
295 | [FSTYPE_XENIX] = detected_xenix, |
296 | [FSTYPE_SYSV4] = detected_sysv4, | |
297 | [FSTYPE_SYSV2] = detected_sysv2, | |
298 | [FSTYPE_COH] = detected_coherent, | |
299 | [FSTYPE_V7] = detected_v7, | |
300 | [FSTYPE_AFS] = detected_sysv4, | |
301 | }; | |
302 | ||
303 | static int complete_read_super(struct super_block *sb, int silent, int size) | |
304 | { | |
305 | struct sysv_sb_info *sbi = SYSV_SB(sb); | |
306 | struct inode *root_inode; | |
307 | char *found = flavour_names[sbi->s_type]; | |
308 | u_char n_bits = size+8; | |
309 | int bsize = 1 << n_bits; | |
310 | int bsize_4 = bsize >> 2; | |
311 | ||
312 | sbi->s_firstinodezone = 2; | |
313 | ||
8de52778 | 314 | flavour_setup[sbi->s_type](sbi, &sb->s_max_links); |
f6e2c20c LS |
315 | if (sbi->s_firstdatazone < sbi->s_firstinodezone) |
316 | return 0; | |
317 | ||
1da177e4 LT |
318 | sbi->s_ndatazones = sbi->s_nzones - sbi->s_firstdatazone; |
319 | sbi->s_inodes_per_block = bsize >> 6; | |
320 | sbi->s_inodes_per_block_1 = (bsize >> 6)-1; | |
321 | sbi->s_inodes_per_block_bits = n_bits-6; | |
322 | sbi->s_ind_per_block = bsize_4; | |
323 | sbi->s_ind_per_block_2 = bsize_4*bsize_4; | |
324 | sbi->s_toobig_block = 10 + bsize_4 * (1 + bsize_4 * (1 + bsize_4)); | |
325 | sbi->s_ind_per_block_bits = n_bits-2; | |
326 | ||
327 | sbi->s_ninodes = (sbi->s_firstdatazone - sbi->s_firstinodezone) | |
328 | << sbi->s_inodes_per_block_bits; | |
329 | ||
330 | if (!silent) | |
331 | printk("VFS: Found a %s FS (block size = %ld) on device %s\n", | |
332 | found, sb->s_blocksize, sb->s_id); | |
333 | ||
334 | sb->s_magic = SYSV_MAGIC_BASE + sbi->s_type; | |
335 | /* set up enough so that it can read an inode */ | |
336 | sb->s_op = &sysv_sops; | |
30304aba | 337 | if (sbi->s_forced_ro) |
1751e8a6 | 338 | sb->s_flags |= SB_RDONLY; |
b8e1343f DH |
339 | root_inode = sysv_iget(sb, SYSV_ROOT_INO); |
340 | if (IS_ERR(root_inode)) { | |
1da177e4 LT |
341 | printk("SysV FS: get root inode failed\n"); |
342 | return 0; | |
343 | } | |
48fde701 | 344 | sb->s_root = d_make_root(root_inode); |
1da177e4 | 345 | if (!sb->s_root) { |
1da177e4 LT |
346 | printk("SysV FS: get root dentry failed\n"); |
347 | return 0; | |
348 | } | |
1da177e4 LT |
349 | return 1; |
350 | } | |
351 | ||
352 | static int sysv_fill_super(struct super_block *sb, void *data, int silent) | |
353 | { | |
354 | struct buffer_head *bh1, *bh = NULL; | |
355 | struct sysv_sb_info *sbi; | |
356 | unsigned long blocknr; | |
357 | int size = 0, i; | |
358 | ||
2ecd05ae AD |
359 | BUILD_BUG_ON(1024 != sizeof (struct xenix_super_block)); |
360 | BUILD_BUG_ON(512 != sizeof (struct sysv4_super_block)); | |
361 | BUILD_BUG_ON(512 != sizeof (struct sysv2_super_block)); | |
362 | BUILD_BUG_ON(500 != sizeof (struct coh_super_block)); | |
363 | BUILD_BUG_ON(64 != sizeof (struct sysv_inode)); | |
1da177e4 | 364 | |
f8314dc6 | 365 | sbi = kzalloc(sizeof(struct sysv_sb_info), GFP_KERNEL); |
1da177e4 LT |
366 | if (!sbi) |
367 | return -ENOMEM; | |
1da177e4 LT |
368 | |
369 | sbi->s_sb = sb; | |
370 | sbi->s_block_base = 0; | |
c07cb01c | 371 | mutex_init(&sbi->s_lock); |
1da177e4 | 372 | sb->s_fs_info = sbi; |
452c2779 DD |
373 | sb->s_time_min = 0; |
374 | sb->s_time_max = U32_MAX; | |
1da177e4 LT |
375 | sb_set_blocksize(sb, BLOCK_SIZE); |
376 | ||
e8c96f8c | 377 | for (i = 0; i < ARRAY_SIZE(flavours) && !size; i++) { |
1da177e4 LT |
378 | brelse(bh); |
379 | bh = sb_bread(sb, flavours[i].block); | |
380 | if (!bh) | |
381 | continue; | |
382 | size = flavours[i].test(SYSV_SB(sb), bh); | |
383 | } | |
384 | ||
385 | if (!size) | |
386 | goto Eunknown; | |
387 | ||
388 | switch (size) { | |
389 | case 1: | |
390 | blocknr = bh->b_blocknr << 1; | |
391 | brelse(bh); | |
392 | sb_set_blocksize(sb, 512); | |
393 | bh1 = sb_bread(sb, blocknr); | |
394 | bh = sb_bread(sb, blocknr + 1); | |
395 | break; | |
396 | case 2: | |
397 | bh1 = bh; | |
398 | break; | |
399 | case 3: | |
400 | blocknr = bh->b_blocknr >> 1; | |
401 | brelse(bh); | |
402 | sb_set_blocksize(sb, 2048); | |
403 | bh1 = bh = sb_bread(sb, blocknr); | |
404 | break; | |
405 | default: | |
406 | goto Ebadsize; | |
407 | } | |
408 | ||
409 | if (bh && bh1) { | |
410 | sbi->s_bh1 = bh1; | |
411 | sbi->s_bh2 = bh; | |
412 | if (complete_read_super(sb, silent, size)) | |
413 | return 0; | |
414 | } | |
415 | ||
416 | brelse(bh1); | |
417 | brelse(bh); | |
418 | sb_set_blocksize(sb, BLOCK_SIZE); | |
419 | printk("oldfs: cannot read superblock\n"); | |
420 | failed: | |
421 | kfree(sbi); | |
422 | return -EINVAL; | |
423 | ||
424 | Eunknown: | |
425 | brelse(bh); | |
426 | if (!silent) | |
427 | printk("VFS: unable to find oldfs superblock on device %s\n", | |
428 | sb->s_id); | |
429 | goto failed; | |
430 | Ebadsize: | |
431 | brelse(bh); | |
432 | if (!silent) | |
433 | printk("VFS: oldfs: unsupported block size (%dKb)\n", | |
434 | 1<<(size-2)); | |
435 | goto failed; | |
436 | } | |
437 | ||
6d0b5456 | 438 | static int v7_sanity_check(struct super_block *sb, struct buffer_head *bh) |
1da177e4 | 439 | { |
1da177e4 LT |
440 | struct v7_super_block *v7sb; |
441 | struct sysv_inode *v7i; | |
6d0b5456 LR |
442 | struct buffer_head *bh2; |
443 | struct sysv_sb_info *sbi; | |
444 | ||
445 | sbi = sb->s_fs_info; | |
446 | ||
447 | /* plausibility check on superblock */ | |
448 | v7sb = (struct v7_super_block *) bh->b_data; | |
449 | if (fs16_to_cpu(sbi, v7sb->s_nfree) > V7_NICFREE || | |
450 | fs16_to_cpu(sbi, v7sb->s_ninode) > V7_NICINOD || | |
451 | fs32_to_cpu(sbi, v7sb->s_fsize) > V7_MAXSIZE) | |
452 | return 0; | |
453 | ||
454 | /* plausibility check on root inode: it is a directory, | |
455 | with a nonzero size that is a multiple of 16 */ | |
456 | bh2 = sb_bread(sb, 2); | |
457 | if (bh2 == NULL) | |
458 | return 0; | |
459 | ||
460 | v7i = (struct sysv_inode *)(bh2->b_data + 64); | |
461 | if ((fs16_to_cpu(sbi, v7i->i_mode) & ~0777) != S_IFDIR || | |
462 | (fs32_to_cpu(sbi, v7i->i_size) == 0) || | |
463 | (fs32_to_cpu(sbi, v7i->i_size) & 017) || | |
464 | (fs32_to_cpu(sbi, v7i->i_size) > V7_NFILES * | |
465 | sizeof(struct sysv_dir_entry))) { | |
466 | brelse(bh2); | |
467 | return 0; | |
468 | } | |
469 | ||
470 | brelse(bh2); | |
471 | return 1; | |
472 | } | |
473 | ||
474 | static int v7_fill_super(struct super_block *sb, void *data, int silent) | |
475 | { | |
476 | struct sysv_sb_info *sbi; | |
477 | struct buffer_head *bh; | |
1da177e4 | 478 | |
7eb0e28c PS |
479 | BUILD_BUG_ON(sizeof(struct v7_super_block) != 440); |
480 | BUILD_BUG_ON(sizeof(struct sysv_inode) != 64); | |
1da177e4 | 481 | |
f8314dc6 | 482 | sbi = kzalloc(sizeof(struct sysv_sb_info), GFP_KERNEL); |
1da177e4 LT |
483 | if (!sbi) |
484 | return -ENOMEM; | |
1da177e4 LT |
485 | |
486 | sbi->s_sb = sb; | |
487 | sbi->s_block_base = 0; | |
488 | sbi->s_type = FSTYPE_V7; | |
49475555 | 489 | mutex_init(&sbi->s_lock); |
1da177e4 | 490 | sb->s_fs_info = sbi; |
452c2779 DD |
491 | sb->s_time_min = 0; |
492 | sb->s_time_max = U32_MAX; | |
1da177e4 LT |
493 | |
494 | sb_set_blocksize(sb, 512); | |
495 | ||
496 | if ((bh = sb_bread(sb, 1)) == NULL) { | |
497 | if (!silent) | |
498 | printk("VFS: unable to read V7 FS superblock on " | |
499 | "device %s.\n", sb->s_id); | |
500 | goto failed; | |
501 | } | |
502 | ||
6d0b5456 LR |
503 | /* Try PDP-11 UNIX */ |
504 | sbi->s_bytesex = BYTESEX_PDP; | |
505 | if (v7_sanity_check(sb, bh)) | |
506 | goto detected; | |
1da177e4 | 507 | |
6d0b5456 LR |
508 | /* Try PC/IX, v7/x86 */ |
509 | sbi->s_bytesex = BYTESEX_LE; | |
510 | if (v7_sanity_check(sb, bh)) | |
511 | goto detected; | |
1da177e4 | 512 | |
6d0b5456 LR |
513 | goto failed; |
514 | ||
515 | detected: | |
1da177e4 LT |
516 | sbi->s_bh1 = bh; |
517 | sbi->s_bh2 = bh; | |
518 | if (complete_read_super(sb, silent, 1)) | |
519 | return 0; | |
520 | ||
521 | failed: | |
6d0b5456 LR |
522 | printk(KERN_ERR "VFS: could not find a valid V7 on %s.\n", |
523 | sb->s_id); | |
1da177e4 LT |
524 | brelse(bh); |
525 | kfree(sbi); | |
526 | return -EINVAL; | |
527 | } | |
528 | ||
529 | /* Every kernel module contains stuff like this. */ | |
530 | ||
152a0836 AV |
531 | static struct dentry *sysv_mount(struct file_system_type *fs_type, |
532 | int flags, const char *dev_name, void *data) | |
1da177e4 | 533 | { |
152a0836 | 534 | return mount_bdev(fs_type, flags, dev_name, data, sysv_fill_super); |
1da177e4 LT |
535 | } |
536 | ||
152a0836 AV |
537 | static struct dentry *v7_mount(struct file_system_type *fs_type, |
538 | int flags, const char *dev_name, void *data) | |
1da177e4 | 539 | { |
152a0836 | 540 | return mount_bdev(fs_type, flags, dev_name, data, v7_fill_super); |
1da177e4 LT |
541 | } |
542 | ||
543 | static struct file_system_type sysv_fs_type = { | |
544 | .owner = THIS_MODULE, | |
545 | .name = "sysv", | |
152a0836 | 546 | .mount = sysv_mount, |
1da177e4 LT |
547 | .kill_sb = kill_block_super, |
548 | .fs_flags = FS_REQUIRES_DEV, | |
549 | }; | |
7f78e035 | 550 | MODULE_ALIAS_FS("sysv"); |
1da177e4 LT |
551 | |
552 | static struct file_system_type v7_fs_type = { | |
553 | .owner = THIS_MODULE, | |
554 | .name = "v7", | |
152a0836 | 555 | .mount = v7_mount, |
1da177e4 LT |
556 | .kill_sb = kill_block_super, |
557 | .fs_flags = FS_REQUIRES_DEV, | |
558 | }; | |
7f78e035 | 559 | MODULE_ALIAS_FS("v7"); |
fa7614dd | 560 | MODULE_ALIAS("v7"); |
1da177e4 | 561 | |
1da177e4 LT |
562 | static int __init init_sysv_fs(void) |
563 | { | |
564 | int error; | |
565 | ||
566 | error = sysv_init_icache(); | |
567 | if (error) | |
568 | goto out; | |
569 | error = register_filesystem(&sysv_fs_type); | |
570 | if (error) | |
571 | goto destroy_icache; | |
572 | error = register_filesystem(&v7_fs_type); | |
573 | if (error) | |
574 | goto unregister; | |
575 | return 0; | |
576 | ||
577 | unregister: | |
578 | unregister_filesystem(&sysv_fs_type); | |
579 | destroy_icache: | |
580 | sysv_destroy_icache(); | |
581 | out: | |
582 | return error; | |
583 | } | |
584 | ||
585 | static void __exit exit_sysv_fs(void) | |
586 | { | |
587 | unregister_filesystem(&sysv_fs_type); | |
588 | unregister_filesystem(&v7_fs_type); | |
589 | sysv_destroy_icache(); | |
590 | } | |
591 | ||
592 | module_init(init_sysv_fs) | |
593 | module_exit(exit_sysv_fs) | |
594 | MODULE_LICENSE("GPL"); |