1 | // SPDX-License-Identifier: GPL-2.0-only |
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 | |
48 | static void detected_xenix(struct sysv_sb_info *sbi, unsigned *max_links) |
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 | |
63 | *max_links = XENIX_LINK_MAX; |
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, n: sbd1->s_isize); |
76 | sbi->s_nzones = fs32_to_cpu(sbi, n: sbd1->s_fsize); |
77 | } |
78 | |
79 | static void detected_sysv4(struct sysv_sb_info *sbi, unsigned *max_links) |
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 | |
90 | *max_links = SYSV_LINK_MAX; |
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, n: sbd->s_isize); |
104 | sbi->s_nzones = fs32_to_cpu(sbi, n: sbd->s_fsize); |
105 | } |
106 | |
107 | static void detected_sysv2(struct sysv_sb_info *sbi, unsigned *max_links) |
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 | |
118 | *max_links = SYSV_LINK_MAX; |
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, n: sbd->s_isize); |
132 | sbi->s_nzones = fs32_to_cpu(sbi, n: sbd->s_fsize); |
133 | } |
134 | |
135 | static void detected_coherent(struct sysv_sb_info *sbi, unsigned *max_links) |
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 | |
142 | *max_links = COH_LINK_MAX; |
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, n: sbd->s_isize); |
155 | sbi->s_nzones = fs32_to_cpu(sbi, n: sbd->s_fsize); |
156 | } |
157 | |
158 | static void detected_v7(struct sysv_sb_info *sbi, unsigned *max_links) |
159 | { |
160 | struct buffer_head *bh2 = sbi->s_bh2; |
161 | struct v7_super_block *sbd = (struct v7_super_block *)bh2->b_data; |
162 | |
163 | *max_links = V7_LINK_MAX; |
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, n: sbd->s_isize); |
176 | sbi->s_nzones = fs32_to_cpu(sbi, n: 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, n: 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, n: sbd->s_type); |
216 | |
217 | if (fs16_to_cpu(sbi, n: sbd->s_nfree) == 0xffff) { |
218 | sbi->s_type = FSTYPE_AFS; |
219 | sbi->s_forced_ro = 1; |
220 | if (!sb_rdonly(sb)) { |
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, n: 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(p: sbd->s_fname,q: "noname" ,size: 6) && memcmp(p: sbd->s_fname,q: "xxxxx " ,size: 6)) |
259 | || (memcmp(p: sbd->s_fpack,q: "nopack" ,size: 6) && memcmp(p: sbd->s_fpack,q: "xxxxx\n" ,size: 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 | |
294 | static void (*flavour_setup[])(struct sysv_sb_info *, unsigned *) = { |
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 | |
314 | flavour_setup[sbi->s_type](sbi, &sb->s_max_links); |
315 | if (sbi->s_firstdatazone < sbi->s_firstinodezone) |
316 | return 0; |
317 | |
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; |
337 | if (sbi->s_forced_ro) |
338 | sb->s_flags |= SB_RDONLY; |
339 | root_inode = sysv_iget(sb, SYSV_ROOT_INO); |
340 | if (IS_ERR(ptr: root_inode)) { |
341 | printk("SysV FS: get root inode failed\n" ); |
342 | return 0; |
343 | } |
344 | sb->s_root = d_make_root(root_inode); |
345 | if (!sb->s_root) { |
346 | printk("SysV FS: get root dentry failed\n" ); |
347 | return 0; |
348 | } |
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 | |
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)); |
364 | |
365 | sbi = kzalloc(size: sizeof(struct sysv_sb_info), GFP_KERNEL); |
366 | if (!sbi) |
367 | return -ENOMEM; |
368 | |
369 | sbi->s_sb = sb; |
370 | sbi->s_block_base = 0; |
371 | mutex_init(&sbi->s_lock); |
372 | sb->s_fs_info = sbi; |
373 | sb->s_time_min = 0; |
374 | sb->s_time_max = U32_MAX; |
375 | sb_set_blocksize(sb, BLOCK_SIZE); |
376 | |
377 | for (i = 0; i < ARRAY_SIZE(flavours) && !size; i++) { |
378 | brelse(bh); |
379 | bh = sb_bread(sb, block: 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, block: blocknr); |
394 | bh = sb_bread(sb, block: 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, block: 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(bh: bh1); |
417 | brelse(bh); |
418 | sb_set_blocksize(sb, BLOCK_SIZE); |
419 | printk("oldfs: cannot read superblock\n" ); |
420 | failed: |
421 | kfree(objp: 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 | |
438 | static int v7_sanity_check(struct super_block *sb, struct buffer_head *bh) |
439 | { |
440 | struct v7_super_block *v7sb; |
441 | struct sysv_inode *v7i; |
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, n: v7sb->s_nfree) > V7_NICFREE || |
450 | fs16_to_cpu(sbi, n: v7sb->s_ninode) > V7_NICINOD || |
451 | fs32_to_cpu(sbi, n: 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, block: 2); |
457 | if (bh2 == NULL) |
458 | return 0; |
459 | |
460 | v7i = (struct sysv_inode *)(bh2->b_data + 64); |
461 | if ((fs16_to_cpu(sbi, n: v7i->i_mode) & ~0777) != S_IFDIR || |
462 | (fs32_to_cpu(sbi, n: v7i->i_size) == 0) || |
463 | (fs32_to_cpu(sbi, n: v7i->i_size) & 017) || |
464 | (fs32_to_cpu(sbi, n: v7i->i_size) > V7_NFILES * |
465 | sizeof(struct sysv_dir_entry))) { |
466 | brelse(bh: bh2); |
467 | return 0; |
468 | } |
469 | |
470 | brelse(bh: 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; |
478 | |
479 | BUILD_BUG_ON(sizeof(struct v7_super_block) != 440); |
480 | BUILD_BUG_ON(sizeof(struct sysv_inode) != 64); |
481 | |
482 | sbi = kzalloc(size: sizeof(struct sysv_sb_info), GFP_KERNEL); |
483 | if (!sbi) |
484 | return -ENOMEM; |
485 | |
486 | sbi->s_sb = sb; |
487 | sbi->s_block_base = 0; |
488 | sbi->s_type = FSTYPE_V7; |
489 | mutex_init(&sbi->s_lock); |
490 | sb->s_fs_info = sbi; |
491 | sb->s_time_min = 0; |
492 | sb->s_time_max = U32_MAX; |
493 | |
494 | sb_set_blocksize(sb, 512); |
495 | |
496 | if ((bh = sb_bread(sb, block: 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 | |
503 | /* Try PDP-11 UNIX */ |
504 | sbi->s_bytesex = BYTESEX_PDP; |
505 | if (v7_sanity_check(sb, bh)) |
506 | goto detected; |
507 | |
508 | /* Try PC/IX, v7/x86 */ |
509 | sbi->s_bytesex = BYTESEX_LE; |
510 | if (v7_sanity_check(sb, bh)) |
511 | goto detected; |
512 | |
513 | goto failed; |
514 | |
515 | detected: |
516 | sbi->s_bh1 = bh; |
517 | sbi->s_bh2 = bh; |
518 | if (complete_read_super(sb, silent, size: 1)) |
519 | return 0; |
520 | |
521 | failed: |
522 | printk(KERN_ERR "VFS: could not find a valid V7 on %s.\n" , |
523 | sb->s_id); |
524 | brelse(bh); |
525 | kfree(objp: sbi); |
526 | return -EINVAL; |
527 | } |
528 | |
529 | /* Every kernel module contains stuff like this. */ |
530 | |
531 | static struct dentry *sysv_mount(struct file_system_type *fs_type, |
532 | int flags, const char *dev_name, void *data) |
533 | { |
534 | return mount_bdev(fs_type, flags, dev_name, data, fill_super: sysv_fill_super); |
535 | } |
536 | |
537 | static struct dentry *v7_mount(struct file_system_type *fs_type, |
538 | int flags, const char *dev_name, void *data) |
539 | { |
540 | return mount_bdev(fs_type, flags, dev_name, data, fill_super: v7_fill_super); |
541 | } |
542 | |
543 | static struct file_system_type sysv_fs_type = { |
544 | .owner = THIS_MODULE, |
545 | .name = "sysv" , |
546 | .mount = sysv_mount, |
547 | .kill_sb = kill_block_super, |
548 | .fs_flags = FS_REQUIRES_DEV, |
549 | }; |
550 | MODULE_ALIAS_FS("sysv" ); |
551 | |
552 | static struct file_system_type v7_fs_type = { |
553 | .owner = THIS_MODULE, |
554 | .name = "v7" , |
555 | .mount = v7_mount, |
556 | .kill_sb = kill_block_super, |
557 | .fs_flags = FS_REQUIRES_DEV, |
558 | }; |
559 | MODULE_ALIAS_FS("v7" ); |
560 | MODULE_ALIAS("v7" ); |
561 | |
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" ); |
595 | |