Commit | Line | Data |
---|---|---|
59bd9ded | 1 | // SPDX-License-Identifier: GPL-2.0-only |
555e3775 BC |
2 | /* |
3 | * Optimized MPEG FS - inode and super operations. | |
4 | * Copyright (C) 2006 Bob Copeland <me@bobcopeland.com> | |
555e3775 | 5 | */ |
555e3775 BC |
6 | #include <linux/module.h> |
7 | #include <linux/sched.h> | |
5a0e3ad6 | 8 | #include <linux/slab.h> |
555e3775 BC |
9 | #include <linux/fs.h> |
10 | #include <linux/vfs.h> | |
5b825c3a | 11 | #include <linux/cred.h> |
555e3775 BC |
12 | #include <linux/parser.h> |
13 | #include <linux/buffer_head.h> | |
14 | #include <linux/vmalloc.h> | |
a9185b41 | 15 | #include <linux/writeback.h> |
d86efb0d | 16 | #include <linux/seq_file.h> |
555e3775 BC |
17 | #include <linux/crc-itu-t.h> |
18 | #include "omfs.h" | |
19 | ||
20 | MODULE_AUTHOR("Bob Copeland <me@bobcopeland.com>"); | |
21 | MODULE_DESCRIPTION("OMFS (ReplayTV/Karma) Filesystem for Linux"); | |
22 | MODULE_LICENSE("GPL"); | |
23 | ||
f068272c BC |
24 | struct buffer_head *omfs_bread(struct super_block *sb, sector_t block) |
25 | { | |
26 | struct omfs_sb_info *sbi = OMFS_SB(sb); | |
27 | if (block >= sbi->s_num_blocks) | |
28 | return NULL; | |
29 | ||
30 | return sb_bread(sb, clus_to_blk(sbi, block)); | |
31 | } | |
32 | ||
587228be | 33 | struct inode *omfs_new_inode(struct inode *dir, umode_t mode) |
555e3775 BC |
34 | { |
35 | struct inode *inode; | |
36 | u64 new_block; | |
37 | int err; | |
38 | int len; | |
39 | struct omfs_sb_info *sbi = OMFS_SB(dir->i_sb); | |
40 | ||
41 | inode = new_inode(dir->i_sb); | |
42 | if (!inode) | |
43 | return ERR_PTR(-ENOMEM); | |
44 | ||
45 | err = omfs_allocate_range(dir->i_sb, sbi->s_mirrors, sbi->s_mirrors, | |
46 | &new_block, &len); | |
47 | if (err) | |
48 | goto fail; | |
49 | ||
50 | inode->i_ino = new_block; | |
f2d40141 | 51 | inode_init_owner(&nop_mnt_idmap, inode, NULL, mode); |
555e3775 BC |
52 | inode->i_mapping->a_ops = &omfs_aops; |
53 | ||
906effbf | 54 | inode->i_atime = inode->i_mtime = inode_set_ctime_current(inode); |
555e3775 BC |
55 | switch (mode & S_IFMT) { |
56 | case S_IFDIR: | |
57 | inode->i_op = &omfs_dir_inops; | |
58 | inode->i_fop = &omfs_dir_operations; | |
59 | inode->i_size = sbi->s_sys_blocksize; | |
60 | inc_nlink(inode); | |
61 | break; | |
62 | case S_IFREG: | |
63 | inode->i_op = &omfs_file_inops; | |
64 | inode->i_fop = &omfs_file_operations; | |
65 | inode->i_size = 0; | |
66 | break; | |
67 | } | |
68 | ||
69 | insert_inode_hash(inode); | |
70 | mark_inode_dirty(inode); | |
71 | return inode; | |
72 | fail: | |
73 | make_bad_inode(inode); | |
74 | iput(inode); | |
75 | return ERR_PTR(err); | |
76 | } | |
77 | ||
78 | /* | |
79 | * Update the header checksums for a dirty inode based on its contents. | |
80 | * Caller is expected to hold the buffer head underlying oi and mark it | |
81 | * dirty. | |
82 | */ | |
83 | static void omfs_update_checksums(struct omfs_inode *oi) | |
84 | { | |
85 | int xor, i, ofs = 0, count; | |
86 | u16 crc = 0; | |
87 | unsigned char *ptr = (unsigned char *) oi; | |
88 | ||
89 | count = be32_to_cpu(oi->i_head.h_body_size); | |
90 | ofs = sizeof(struct omfs_header); | |
91 | ||
92 | crc = crc_itu_t(crc, ptr + ofs, count); | |
93 | oi->i_head.h_crc = cpu_to_be16(crc); | |
94 | ||
95 | xor = ptr[0]; | |
96 | for (i = 1; i < OMFS_XOR_COUNT; i++) | |
97 | xor ^= ptr[i]; | |
98 | ||
99 | oi->i_head.h_check_xor = xor; | |
100 | } | |
101 | ||
a9185b41 | 102 | static int __omfs_write_inode(struct inode *inode, int wait) |
555e3775 BC |
103 | { |
104 | struct omfs_inode *oi; | |
105 | struct omfs_sb_info *sbi = OMFS_SB(inode->i_sb); | |
106 | struct buffer_head *bh, *bh2; | |
555e3775 BC |
107 | u64 ctime; |
108 | int i; | |
109 | int ret = -EIO; | |
110 | int sync_failed = 0; | |
111 | ||
112 | /* get current inode since we may have written sibling ptrs etc. */ | |
f068272c | 113 | bh = omfs_bread(inode->i_sb, inode->i_ino); |
555e3775 BC |
114 | if (!bh) |
115 | goto out; | |
116 | ||
117 | oi = (struct omfs_inode *) bh->b_data; | |
118 | ||
119 | oi->i_head.h_self = cpu_to_be64(inode->i_ino); | |
120 | if (S_ISDIR(inode->i_mode)) | |
121 | oi->i_type = OMFS_DIR; | |
122 | else if (S_ISREG(inode->i_mode)) | |
123 | oi->i_type = OMFS_FILE; | |
124 | else { | |
125 | printk(KERN_WARNING "omfs: unknown file type: %d\n", | |
126 | inode->i_mode); | |
127 | goto out_brelse; | |
128 | } | |
129 | ||
130 | oi->i_head.h_body_size = cpu_to_be32(sbi->s_sys_blocksize - | |
131 | sizeof(struct omfs_header)); | |
132 | oi->i_head.h_version = 1; | |
133 | oi->i_head.h_type = OMFS_INODE_NORMAL; | |
134 | oi->i_head.h_magic = OMFS_IMAGIC; | |
135 | oi->i_size = cpu_to_be64(inode->i_size); | |
136 | ||
906effbf JL |
137 | ctime = inode_get_ctime(inode).tv_sec * 1000LL + |
138 | ((inode_get_ctime(inode).tv_nsec + 999)/1000); | |
555e3775 BC |
139 | oi->i_ctime = cpu_to_be64(ctime); |
140 | ||
141 | omfs_update_checksums(oi); | |
142 | ||
143 | mark_buffer_dirty(bh); | |
144 | if (wait) { | |
145 | sync_dirty_buffer(bh); | |
146 | if (buffer_req(bh) && !buffer_uptodate(bh)) | |
147 | sync_failed = 1; | |
148 | } | |
149 | ||
150 | /* if mirroring writes, copy to next fsblock */ | |
151 | for (i = 1; i < sbi->s_mirrors; i++) { | |
f068272c | 152 | bh2 = omfs_bread(inode->i_sb, inode->i_ino + i); |
555e3775 BC |
153 | if (!bh2) |
154 | goto out_brelse; | |
155 | ||
156 | memcpy(bh2->b_data, bh->b_data, bh->b_size); | |
157 | mark_buffer_dirty(bh2); | |
158 | if (wait) { | |
159 | sync_dirty_buffer(bh2); | |
160 | if (buffer_req(bh2) && !buffer_uptodate(bh2)) | |
161 | sync_failed = 1; | |
162 | } | |
163 | brelse(bh2); | |
164 | } | |
165 | ret = (sync_failed) ? -EIO : 0; | |
166 | out_brelse: | |
167 | brelse(bh); | |
168 | out: | |
169 | return ret; | |
170 | } | |
171 | ||
a9185b41 CH |
172 | static int omfs_write_inode(struct inode *inode, struct writeback_control *wbc) |
173 | { | |
174 | return __omfs_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL); | |
175 | } | |
176 | ||
555e3775 BC |
177 | int omfs_sync_inode(struct inode *inode) |
178 | { | |
a9185b41 | 179 | return __omfs_write_inode(inode, 1); |
555e3775 BC |
180 | } |
181 | ||
182 | /* | |
183 | * called when an entry is deleted, need to clear the bits in the | |
184 | * bitmaps. | |
185 | */ | |
69c9e750 | 186 | static void omfs_evict_inode(struct inode *inode) |
555e3775 | 187 | { |
91b0abe3 | 188 | truncate_inode_pages_final(&inode->i_data); |
dbd5768f | 189 | clear_inode(inode); |
69c9e750 AV |
190 | |
191 | if (inode->i_nlink) | |
192 | return; | |
555e3775 BC |
193 | |
194 | if (S_ISREG(inode->i_mode)) { | |
195 | inode->i_size = 0; | |
196 | omfs_shrink_inode(inode); | |
197 | } | |
198 | ||
199 | omfs_clear_range(inode->i_sb, inode->i_ino, 2); | |
555e3775 BC |
200 | } |
201 | ||
202 | struct inode *omfs_iget(struct super_block *sb, ino_t ino) | |
203 | { | |
204 | struct omfs_sb_info *sbi = OMFS_SB(sb); | |
205 | struct omfs_inode *oi; | |
206 | struct buffer_head *bh; | |
555e3775 BC |
207 | u64 ctime; |
208 | unsigned long nsecs; | |
209 | struct inode *inode; | |
210 | ||
211 | inode = iget_locked(sb, ino); | |
212 | if (!inode) | |
213 | return ERR_PTR(-ENOMEM); | |
214 | if (!(inode->i_state & I_NEW)) | |
215 | return inode; | |
216 | ||
f068272c | 217 | bh = omfs_bread(inode->i_sb, ino); |
555e3775 BC |
218 | if (!bh) |
219 | goto iget_failed; | |
220 | ||
221 | oi = (struct omfs_inode *)bh->b_data; | |
222 | ||
223 | /* check self */ | |
224 | if (ino != be64_to_cpu(oi->i_head.h_self)) | |
225 | goto fail_bh; | |
226 | ||
227 | inode->i_uid = sbi->s_uid; | |
228 | inode->i_gid = sbi->s_gid; | |
229 | ||
230 | ctime = be64_to_cpu(oi->i_ctime); | |
231 | nsecs = do_div(ctime, 1000) * 1000L; | |
232 | ||
233 | inode->i_atime.tv_sec = ctime; | |
234 | inode->i_mtime.tv_sec = ctime; | |
906effbf | 235 | inode_set_ctime(inode, ctime, nsecs); |
555e3775 BC |
236 | inode->i_atime.tv_nsec = nsecs; |
237 | inode->i_mtime.tv_nsec = nsecs; | |
555e3775 BC |
238 | |
239 | inode->i_mapping->a_ops = &omfs_aops; | |
240 | ||
241 | switch (oi->i_type) { | |
242 | case OMFS_DIR: | |
243 | inode->i_mode = S_IFDIR | (S_IRWXUGO & ~sbi->s_dmask); | |
244 | inode->i_op = &omfs_dir_inops; | |
245 | inode->i_fop = &omfs_dir_operations; | |
c963343a | 246 | inode->i_size = sbi->s_sys_blocksize; |
555e3775 BC |
247 | inc_nlink(inode); |
248 | break; | |
249 | case OMFS_FILE: | |
250 | inode->i_mode = S_IFREG | (S_IRWXUGO & ~sbi->s_fmask); | |
251 | inode->i_fop = &omfs_file_operations; | |
252 | inode->i_size = be64_to_cpu(oi->i_size); | |
253 | break; | |
254 | } | |
255 | brelse(bh); | |
256 | unlock_new_inode(inode); | |
257 | return inode; | |
258 | fail_bh: | |
259 | brelse(bh); | |
260 | iget_failed: | |
261 | iget_failed(inode); | |
262 | return ERR_PTR(-EIO); | |
263 | } | |
264 | ||
265 | static void omfs_put_super(struct super_block *sb) | |
266 | { | |
267 | struct omfs_sb_info *sbi = OMFS_SB(sb); | |
268 | kfree(sbi->s_imap); | |
269 | kfree(sbi); | |
270 | sb->s_fs_info = NULL; | |
271 | } | |
272 | ||
273 | static int omfs_statfs(struct dentry *dentry, struct kstatfs *buf) | |
274 | { | |
275 | struct super_block *s = dentry->d_sb; | |
276 | struct omfs_sb_info *sbi = OMFS_SB(s); | |
197e671e CL |
277 | u64 id = huge_encode_dev(s->s_bdev->bd_dev); |
278 | ||
555e3775 BC |
279 | buf->f_type = OMFS_MAGIC; |
280 | buf->f_bsize = sbi->s_blocksize; | |
281 | buf->f_blocks = sbi->s_num_blocks; | |
282 | buf->f_files = sbi->s_num_blocks; | |
283 | buf->f_namelen = OMFS_NAMELEN; | |
6d1349c7 | 284 | buf->f_fsid = u64_to_fsid(id); |
555e3775 BC |
285 | |
286 | buf->f_bfree = buf->f_bavail = buf->f_ffree = | |
287 | omfs_count_free(s); | |
197e671e | 288 | |
555e3775 BC |
289 | return 0; |
290 | } | |
291 | ||
d86efb0d DH |
292 | /* |
293 | * Display the mount options in /proc/mounts. | |
294 | */ | |
295 | static int omfs_show_options(struct seq_file *m, struct dentry *root) | |
296 | { | |
297 | struct omfs_sb_info *sbi = OMFS_SB(root->d_sb); | |
298 | umode_t cur_umask = current_umask(); | |
299 | ||
300 | if (!uid_eq(sbi->s_uid, current_uid())) | |
301 | seq_printf(m, ",uid=%u", | |
302 | from_kuid_munged(&init_user_ns, sbi->s_uid)); | |
303 | if (!gid_eq(sbi->s_gid, current_gid())) | |
304 | seq_printf(m, ",gid=%u", | |
305 | from_kgid_munged(&init_user_ns, sbi->s_gid)); | |
306 | ||
307 | if (sbi->s_dmask == sbi->s_fmask) { | |
308 | if (sbi->s_fmask != cur_umask) | |
309 | seq_printf(m, ",umask=%o", sbi->s_fmask); | |
310 | } else { | |
311 | if (sbi->s_dmask != cur_umask) | |
312 | seq_printf(m, ",dmask=%o", sbi->s_dmask); | |
313 | if (sbi->s_fmask != cur_umask) | |
314 | seq_printf(m, ",fmask=%o", sbi->s_fmask); | |
315 | } | |
316 | ||
317 | return 0; | |
318 | } | |
319 | ||
b87221de | 320 | static const struct super_operations omfs_sops = { |
555e3775 | 321 | .write_inode = omfs_write_inode, |
69c9e750 | 322 | .evict_inode = omfs_evict_inode, |
555e3775 BC |
323 | .put_super = omfs_put_super, |
324 | .statfs = omfs_statfs, | |
d86efb0d | 325 | .show_options = omfs_show_options, |
555e3775 BC |
326 | }; |
327 | ||
328 | /* | |
329 | * For Rio Karma, there is an on-disk free bitmap whose location is | |
330 | * stored in the root block. For ReplayTV, there is no such free bitmap | |
331 | * so we have to walk the tree. Both inodes and file data are allocated | |
332 | * from the same map. This array can be big (300k) so we allocate | |
333 | * in units of the blocksize. | |
334 | */ | |
335 | static int omfs_get_imap(struct super_block *sb) | |
336 | { | |
c0345ee5 BC |
337 | unsigned int bitmap_size, array_size; |
338 | int count; | |
555e3775 BC |
339 | struct omfs_sb_info *sbi = OMFS_SB(sb); |
340 | struct buffer_head *bh; | |
341 | unsigned long **ptr; | |
342 | sector_t block; | |
343 | ||
344 | bitmap_size = DIV_ROUND_UP(sbi->s_num_blocks, 8); | |
345 | array_size = DIV_ROUND_UP(bitmap_size, sb->s_blocksize); | |
346 | ||
347 | if (sbi->s_bitmap_ino == ~0ULL) | |
348 | goto out; | |
349 | ||
350 | sbi->s_imap_size = array_size; | |
998d6688 | 351 | sbi->s_imap = kcalloc(array_size, sizeof(unsigned long *), GFP_KERNEL); |
555e3775 BC |
352 | if (!sbi->s_imap) |
353 | goto nomem; | |
354 | ||
355 | block = clus_to_blk(sbi, sbi->s_bitmap_ino); | |
f068272c BC |
356 | if (block >= sbi->s_num_blocks) |
357 | goto nomem; | |
358 | ||
555e3775 BC |
359 | ptr = sbi->s_imap; |
360 | for (count = bitmap_size; count > 0; count -= sb->s_blocksize) { | |
361 | bh = sb_bread(sb, block++); | |
362 | if (!bh) | |
363 | goto nomem_free; | |
a7c9df04 | 364 | *ptr = kmemdup(bh->b_data, sb->s_blocksize, GFP_KERNEL); |
555e3775 BC |
365 | if (!*ptr) { |
366 | brelse(bh); | |
367 | goto nomem_free; | |
368 | } | |
555e3775 BC |
369 | if (count < sb->s_blocksize) |
370 | memset((void *)*ptr + count, 0xff, | |
371 | sb->s_blocksize - count); | |
372 | brelse(bh); | |
373 | ptr++; | |
374 | } | |
375 | out: | |
376 | return 0; | |
377 | ||
378 | nomem_free: | |
379 | for (count = 0; count < array_size; count++) | |
380 | kfree(sbi->s_imap[count]); | |
381 | ||
382 | kfree(sbi->s_imap); | |
383 | nomem: | |
384 | sbi->s_imap = NULL; | |
385 | sbi->s_imap_size = 0; | |
386 | return -ENOMEM; | |
387 | } | |
388 | ||
389 | enum { | |
dcbff39d | 390 | Opt_uid, Opt_gid, Opt_umask, Opt_dmask, Opt_fmask, Opt_err |
555e3775 BC |
391 | }; |
392 | ||
a447c093 | 393 | static const match_table_t tokens = { |
555e3775 BC |
394 | {Opt_uid, "uid=%u"}, |
395 | {Opt_gid, "gid=%u"}, | |
396 | {Opt_umask, "umask=%o"}, | |
397 | {Opt_dmask, "dmask=%o"}, | |
398 | {Opt_fmask, "fmask=%o"}, | |
dcbff39d | 399 | {Opt_err, NULL}, |
555e3775 BC |
400 | }; |
401 | ||
402 | static int parse_options(char *options, struct omfs_sb_info *sbi) | |
403 | { | |
404 | char *p; | |
405 | substring_t args[MAX_OPT_ARGS]; | |
406 | int option; | |
407 | ||
408 | if (!options) | |
409 | return 1; | |
410 | ||
411 | while ((p = strsep(&options, ",")) != NULL) { | |
412 | int token; | |
413 | if (!*p) | |
414 | continue; | |
415 | ||
416 | token = match_token(p, tokens, args); | |
417 | switch (token) { | |
418 | case Opt_uid: | |
419 | if (match_int(&args[0], &option)) | |
420 | return 0; | |
80fcbe75 EB |
421 | sbi->s_uid = make_kuid(current_user_ns(), option); |
422 | if (!uid_valid(sbi->s_uid)) | |
423 | return 0; | |
555e3775 BC |
424 | break; |
425 | case Opt_gid: | |
426 | if (match_int(&args[0], &option)) | |
427 | return 0; | |
80fcbe75 EB |
428 | sbi->s_gid = make_kgid(current_user_ns(), option); |
429 | if (!gid_valid(sbi->s_gid)) | |
430 | return 0; | |
555e3775 BC |
431 | break; |
432 | case Opt_umask: | |
433 | if (match_octal(&args[0], &option)) | |
434 | return 0; | |
435 | sbi->s_fmask = sbi->s_dmask = option; | |
436 | break; | |
437 | case Opt_dmask: | |
438 | if (match_octal(&args[0], &option)) | |
439 | return 0; | |
440 | sbi->s_dmask = option; | |
441 | break; | |
442 | case Opt_fmask: | |
443 | if (match_octal(&args[0], &option)) | |
444 | return 0; | |
445 | sbi->s_fmask = option; | |
446 | break; | |
447 | default: | |
448 | return 0; | |
449 | } | |
450 | } | |
451 | return 1; | |
452 | } | |
453 | ||
454 | static int omfs_fill_super(struct super_block *sb, void *data, int silent) | |
455 | { | |
456 | struct buffer_head *bh, *bh2; | |
457 | struct omfs_super_block *omfs_sb; | |
458 | struct omfs_root_block *omfs_rb; | |
459 | struct omfs_sb_info *sbi; | |
460 | struct inode *root; | |
555e3775 BC |
461 | int ret = -EINVAL; |
462 | ||
555e3775 BC |
463 | sbi = kzalloc(sizeof(struct omfs_sb_info), GFP_KERNEL); |
464 | if (!sbi) | |
465 | return -ENOMEM; | |
466 | ||
467 | sb->s_fs_info = sbi; | |
468 | ||
c222d53e DH |
469 | sbi->s_uid = current_uid(); |
470 | sbi->s_gid = current_gid(); | |
ce3b0f8d | 471 | sbi->s_dmask = sbi->s_fmask = current_umask(); |
555e3775 BC |
472 | |
473 | if (!parse_options((char *) data, sbi)) | |
474 | goto end; | |
475 | ||
476 | sb->s_maxbytes = 0xffffffff; | |
477 | ||
8833293d DD |
478 | sb->s_time_gran = NSEC_PER_MSEC; |
479 | sb->s_time_min = 0; | |
480 | sb->s_time_max = U64_MAX / MSEC_PER_SEC; | |
481 | ||
555e3775 BC |
482 | sb_set_blocksize(sb, 0x200); |
483 | ||
484 | bh = sb_bread(sb, 0); | |
485 | if (!bh) | |
486 | goto end; | |
487 | ||
488 | omfs_sb = (struct omfs_super_block *)bh->b_data; | |
489 | ||
490 | if (omfs_sb->s_magic != cpu_to_be32(OMFS_MAGIC)) { | |
491 | if (!silent) | |
492 | printk(KERN_ERR "omfs: Invalid superblock (%x)\n", | |
493 | omfs_sb->s_magic); | |
494 | goto out_brelse_bh; | |
495 | } | |
496 | sb->s_magic = OMFS_MAGIC; | |
497 | ||
498 | sbi->s_num_blocks = be64_to_cpu(omfs_sb->s_num_blocks); | |
499 | sbi->s_blocksize = be32_to_cpu(omfs_sb->s_blocksize); | |
500 | sbi->s_mirrors = be32_to_cpu(omfs_sb->s_mirrors); | |
501 | sbi->s_root_ino = be64_to_cpu(omfs_sb->s_root_block); | |
502 | sbi->s_sys_blocksize = be32_to_cpu(omfs_sb->s_sys_blocksize); | |
503 | mutex_init(&sbi->s_bitmap_lock); | |
504 | ||
76e51210 FF |
505 | if (sbi->s_num_blocks > OMFS_MAX_BLOCKS) { |
506 | printk(KERN_ERR "omfs: sysblock number (%llx) is out of range\n", | |
507 | (unsigned long long)sbi->s_num_blocks); | |
508 | goto out_brelse_bh; | |
509 | } | |
510 | ||
555e3775 BC |
511 | if (sbi->s_sys_blocksize > PAGE_SIZE) { |
512 | printk(KERN_ERR "omfs: sysblock size (%d) is out of range\n", | |
513 | sbi->s_sys_blocksize); | |
514 | goto out_brelse_bh; | |
515 | } | |
516 | ||
517 | if (sbi->s_blocksize < sbi->s_sys_blocksize || | |
518 | sbi->s_blocksize > OMFS_MAX_BLOCK_SIZE) { | |
519 | printk(KERN_ERR "omfs: block size (%d) is out of range\n", | |
520 | sbi->s_blocksize); | |
521 | goto out_brelse_bh; | |
522 | } | |
523 | ||
524 | /* | |
525 | * Use sys_blocksize as the fs block since it is smaller than a | |
526 | * page while the fs blocksize can be larger. | |
527 | */ | |
528 | sb_set_blocksize(sb, sbi->s_sys_blocksize); | |
529 | ||
530 | /* | |
531 | * ...and the difference goes into a shift. sys_blocksize is always | |
532 | * a power of two factor of blocksize. | |
533 | */ | |
534 | sbi->s_block_shift = get_bitmask_order(sbi->s_blocksize) - | |
535 | get_bitmask_order(sbi->s_sys_blocksize); | |
536 | ||
f068272c | 537 | bh2 = omfs_bread(sb, be64_to_cpu(omfs_sb->s_root_block)); |
555e3775 BC |
538 | if (!bh2) |
539 | goto out_brelse_bh; | |
540 | ||
541 | omfs_rb = (struct omfs_root_block *)bh2->b_data; | |
542 | ||
543 | sbi->s_bitmap_ino = be64_to_cpu(omfs_rb->r_bitmap); | |
544 | sbi->s_clustersize = be32_to_cpu(omfs_rb->r_clustersize); | |
545 | ||
546 | if (sbi->s_num_blocks != be64_to_cpu(omfs_rb->r_num_blocks)) { | |
547 | printk(KERN_ERR "omfs: block count discrepancy between " | |
548 | "super and root blocks (%llx, %llx)\n", | |
dc60bf1d AB |
549 | (unsigned long long)sbi->s_num_blocks, |
550 | (unsigned long long)be64_to_cpu(omfs_rb->r_num_blocks)); | |
555e3775 BC |
551 | goto out_brelse_bh2; |
552 | } | |
553 | ||
9442e54f BC |
554 | if (sbi->s_bitmap_ino != ~0ULL && |
555 | sbi->s_bitmap_ino > sbi->s_num_blocks) { | |
556 | printk(KERN_ERR "omfs: free space bitmap location is corrupt " | |
557 | "(%llx, total blocks %llx)\n", | |
558 | (unsigned long long) sbi->s_bitmap_ino, | |
559 | (unsigned long long) sbi->s_num_blocks); | |
560 | goto out_brelse_bh2; | |
561 | } | |
8800a044 BC |
562 | if (sbi->s_clustersize < 1 || |
563 | sbi->s_clustersize > OMFS_MAX_CLUSTER_SIZE) { | |
564 | printk(KERN_ERR "omfs: cluster size out of range (%d)", | |
565 | sbi->s_clustersize); | |
566 | goto out_brelse_bh2; | |
567 | } | |
9442e54f | 568 | |
555e3775 BC |
569 | ret = omfs_get_imap(sb); |
570 | if (ret) | |
571 | goto out_brelse_bh2; | |
572 | ||
573 | sb->s_op = &omfs_sops; | |
574 | ||
575 | root = omfs_iget(sb, be64_to_cpu(omfs_rb->r_root_dir)); | |
576 | if (IS_ERR(root)) { | |
577 | ret = PTR_ERR(root); | |
578 | goto out_brelse_bh2; | |
579 | } | |
580 | ||
48fde701 | 581 | sb->s_root = d_make_root(root); |
3a281f94 BC |
582 | if (!sb->s_root) { |
583 | ret = -ENOMEM; | |
555e3775 | 584 | goto out_brelse_bh2; |
3a281f94 | 585 | } |
555e3775 BC |
586 | printk(KERN_DEBUG "omfs: Mounted volume %s\n", omfs_rb->r_name); |
587 | ||
588 | ret = 0; | |
589 | out_brelse_bh2: | |
590 | brelse(bh2); | |
591 | out_brelse_bh: | |
592 | brelse(bh); | |
593 | end: | |
70d9e384 DB |
594 | if (ret) |
595 | kfree(sbi); | |
555e3775 BC |
596 | return ret; |
597 | } | |
598 | ||
152a0836 AV |
599 | static struct dentry *omfs_mount(struct file_system_type *fs_type, |
600 | int flags, const char *dev_name, void *data) | |
555e3775 | 601 | { |
152a0836 | 602 | return mount_bdev(fs_type, flags, dev_name, data, omfs_fill_super); |
555e3775 BC |
603 | } |
604 | ||
605 | static struct file_system_type omfs_fs_type = { | |
606 | .owner = THIS_MODULE, | |
607 | .name = "omfs", | |
152a0836 | 608 | .mount = omfs_mount, |
555e3775 BC |
609 | .kill_sb = kill_block_super, |
610 | .fs_flags = FS_REQUIRES_DEV, | |
611 | }; | |
7f78e035 | 612 | MODULE_ALIAS_FS("omfs"); |
555e3775 BC |
613 | |
614 | static int __init init_omfs_fs(void) | |
615 | { | |
616 | return register_filesystem(&omfs_fs_type); | |
617 | } | |
618 | ||
619 | static void __exit exit_omfs_fs(void) | |
620 | { | |
621 | unregister_filesystem(&omfs_fs_type); | |
622 | } | |
623 | ||
624 | module_init(init_omfs_fs); | |
625 | module_exit(exit_omfs_fs); |