Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * fs/bfs/inode.c | |
3 | * BFS superblock and inode operations. | |
69688262 | 4 | * Copyright (C) 1999-2006 Tigran Aivazian <tigran@aivazian.fsnet.co.uk> |
1da177e4 | 5 | * From fs/minix, Copyright (C) 1991, 1992 Linus Torvalds. |
fac92bec AS |
6 | * |
7 | * Made endianness-clean by Andrew Stribblehill <ads@wompom.org>, 2005. | |
1da177e4 LT |
8 | */ |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/mm.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/fs.h> | |
1da177e4 LT |
15 | #include <linux/buffer_head.h> |
16 | #include <linux/vfs.h> | |
a9185b41 | 17 | #include <linux/writeback.h> |
1da177e4 LT |
18 | #include <asm/uaccess.h> |
19 | #include "bfs.h" | |
20 | ||
69688262 | 21 | MODULE_AUTHOR("Tigran Aivazian <tigran@aivazian.fsnet.co.uk>"); |
1da177e4 LT |
22 | MODULE_DESCRIPTION("SCO UnixWare BFS filesystem for Linux"); |
23 | MODULE_LICENSE("GPL"); | |
24 | ||
25 | #undef DEBUG | |
26 | ||
27 | #ifdef DEBUG | |
28 | #define dprintf(x...) printf(x) | |
29 | #else | |
30 | #define dprintf(x...) | |
31 | #endif | |
32 | ||
f433dc56 | 33 | void dump_imap(const char *prefix, struct super_block *s); |
1da177e4 | 34 | |
e33ab086 | 35 | struct inode *bfs_iget(struct super_block *sb, unsigned long ino) |
1da177e4 | 36 | { |
f433dc56 | 37 | struct bfs_inode *di; |
e33ab086 | 38 | struct inode *inode; |
f433dc56 | 39 | struct buffer_head *bh; |
1da177e4 LT |
40 | int block, off; |
41 | ||
e33ab086 DH |
42 | inode = iget_locked(sb, ino); |
43 | if (IS_ERR(inode)) | |
44 | return ERR_PTR(-ENOMEM); | |
45 | if (!(inode->i_state & I_NEW)) | |
46 | return inode; | |
47 | ||
f433dc56 | 48 | if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(inode->i_sb)->si_lasti)) { |
1da177e4 | 49 | printf("Bad inode number %s:%08lx\n", inode->i_sb->s_id, ino); |
e33ab086 | 50 | goto error; |
1da177e4 LT |
51 | } |
52 | ||
f433dc56 | 53 | block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1; |
1da177e4 LT |
54 | bh = sb_bread(inode->i_sb, block); |
55 | if (!bh) { | |
f433dc56 DV |
56 | printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id, |
57 | ino); | |
e33ab086 | 58 | goto error; |
1da177e4 LT |
59 | } |
60 | ||
61 | off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; | |
62 | di = (struct bfs_inode *)bh->b_data + off; | |
63 | ||
f433dc56 | 64 | inode->i_mode = 0x0000FFFF & le32_to_cpu(di->i_mode); |
fac92bec | 65 | if (le32_to_cpu(di->i_vtype) == BFS_VDIR) { |
1da177e4 LT |
66 | inode->i_mode |= S_IFDIR; |
67 | inode->i_op = &bfs_dir_inops; | |
68 | inode->i_fop = &bfs_dir_operations; | |
fac92bec | 69 | } else if (le32_to_cpu(di->i_vtype) == BFS_VREG) { |
1da177e4 LT |
70 | inode->i_mode |= S_IFREG; |
71 | inode->i_op = &bfs_file_inops; | |
72 | inode->i_fop = &bfs_file_operations; | |
73 | inode->i_mapping->a_ops = &bfs_aops; | |
74 | } | |
75 | ||
fac92bec AS |
76 | BFS_I(inode)->i_sblock = le32_to_cpu(di->i_sblock); |
77 | BFS_I(inode)->i_eblock = le32_to_cpu(di->i_eblock); | |
f433dc56 | 78 | BFS_I(inode)->i_dsk_ino = le16_to_cpu(di->i_ino); |
7f5b82b8 EB |
79 | i_uid_write(inode, le32_to_cpu(di->i_uid)); |
80 | i_gid_write(inode, le32_to_cpu(di->i_gid)); | |
bfe86848 | 81 | set_nlink(inode, le32_to_cpu(di->i_nlink)); |
1da177e4 LT |
82 | inode->i_size = BFS_FILESIZE(di); |
83 | inode->i_blocks = BFS_FILEBLOCKS(di); | |
fac92bec AS |
84 | inode->i_atime.tv_sec = le32_to_cpu(di->i_atime); |
85 | inode->i_mtime.tv_sec = le32_to_cpu(di->i_mtime); | |
86 | inode->i_ctime.tv_sec = le32_to_cpu(di->i_ctime); | |
1da177e4 LT |
87 | inode->i_atime.tv_nsec = 0; |
88 | inode->i_mtime.tv_nsec = 0; | |
89 | inode->i_ctime.tv_nsec = 0; | |
1da177e4 LT |
90 | |
91 | brelse(bh); | |
e33ab086 DH |
92 | unlock_new_inode(inode); |
93 | return inode; | |
94 | ||
95 | error: | |
96 | iget_failed(inode); | |
97 | return ERR_PTR(-EIO); | |
1da177e4 LT |
98 | } |
99 | ||
9df2f851 AV |
100 | static struct bfs_inode *find_inode(struct super_block *sb, u16 ino, struct buffer_head **p) |
101 | { | |
102 | if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(sb)->si_lasti)) { | |
103 | printf("Bad inode number %s:%08x\n", sb->s_id, ino); | |
104 | return ERR_PTR(-EIO); | |
105 | } | |
106 | ||
107 | ino -= BFS_ROOT_INO; | |
108 | ||
109 | *p = sb_bread(sb, 1 + ino / BFS_INODES_PER_BLOCK); | |
110 | if (!*p) { | |
111 | printf("Unable to read inode %s:%08x\n", sb->s_id, ino); | |
112 | return ERR_PTR(-EIO); | |
113 | } | |
114 | ||
115 | return (struct bfs_inode *)(*p)->b_data + ino % BFS_INODES_PER_BLOCK; | |
116 | } | |
117 | ||
a9185b41 | 118 | static int bfs_write_inode(struct inode *inode, struct writeback_control *wbc) |
1da177e4 | 119 | { |
4427f0c3 | 120 | struct bfs_sb_info *info = BFS_SB(inode->i_sb); |
fac92bec AS |
121 | unsigned int ino = (u16)inode->i_ino; |
122 | unsigned long i_sblock; | |
f433dc56 DV |
123 | struct bfs_inode *di; |
124 | struct buffer_head *bh; | |
4427f0c3 | 125 | int err = 0; |
1da177e4 | 126 | |
fac92bec AS |
127 | dprintf("ino=%08x\n", ino); |
128 | ||
9df2f851 AV |
129 | di = find_inode(inode->i_sb, ino, &bh); |
130 | if (IS_ERR(di)) | |
131 | return PTR_ERR(di); | |
1da177e4 | 132 | |
3f165e4c | 133 | mutex_lock(&info->bfs_lock); |
1da177e4 | 134 | |
fac92bec AS |
135 | if (ino == BFS_ROOT_INO) |
136 | di->i_vtype = cpu_to_le32(BFS_VDIR); | |
1da177e4 | 137 | else |
fac92bec AS |
138 | di->i_vtype = cpu_to_le32(BFS_VREG); |
139 | ||
140 | di->i_ino = cpu_to_le16(ino); | |
141 | di->i_mode = cpu_to_le32(inode->i_mode); | |
7f5b82b8 EB |
142 | di->i_uid = cpu_to_le32(i_uid_read(inode)); |
143 | di->i_gid = cpu_to_le32(i_gid_read(inode)); | |
fac92bec AS |
144 | di->i_nlink = cpu_to_le32(inode->i_nlink); |
145 | di->i_atime = cpu_to_le32(inode->i_atime.tv_sec); | |
146 | di->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec); | |
147 | di->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec); | |
148 | i_sblock = BFS_I(inode)->i_sblock; | |
149 | di->i_sblock = cpu_to_le32(i_sblock); | |
150 | di->i_eblock = cpu_to_le32(BFS_I(inode)->i_eblock); | |
151 | di->i_eoffset = cpu_to_le32(i_sblock * BFS_BSIZE + inode->i_size - 1); | |
1da177e4 LT |
152 | |
153 | mark_buffer_dirty(bh); | |
a9185b41 | 154 | if (wbc->sync_mode == WB_SYNC_ALL) { |
4427f0c3 AV |
155 | sync_dirty_buffer(bh); |
156 | if (buffer_req(bh) && !buffer_uptodate(bh)) | |
157 | err = -EIO; | |
158 | } | |
1da177e4 | 159 | brelse(bh); |
3f165e4c | 160 | mutex_unlock(&info->bfs_lock); |
4427f0c3 | 161 | return err; |
1da177e4 LT |
162 | } |
163 | ||
9df2f851 | 164 | static void bfs_evict_inode(struct inode *inode) |
1da177e4 LT |
165 | { |
166 | unsigned long ino = inode->i_ino; | |
f433dc56 DV |
167 | struct bfs_inode *di; |
168 | struct buffer_head *bh; | |
f433dc56 DV |
169 | struct super_block *s = inode->i_sb; |
170 | struct bfs_sb_info *info = BFS_SB(s); | |
171 | struct bfs_inode_info *bi = BFS_I(inode); | |
1da177e4 | 172 | |
fac92bec | 173 | dprintf("ino=%08lx\n", ino); |
1da177e4 | 174 | |
fef26658 | 175 | truncate_inode_pages(&inode->i_data, 0); |
9df2f851 | 176 | invalidate_inode_buffers(inode); |
dbd5768f | 177 | clear_inode(inode); |
fef26658 | 178 | |
9df2f851 | 179 | if (inode->i_nlink) |
1da177e4 | 180 | return; |
f433dc56 | 181 | |
9df2f851 AV |
182 | di = find_inode(s, inode->i_ino, &bh); |
183 | if (IS_ERR(di)) | |
1da177e4 | 184 | return; |
9df2f851 AV |
185 | |
186 | mutex_lock(&info->bfs_lock); | |
187 | /* clear on-disk inode */ | |
188 | memset(di, 0, sizeof(struct bfs_inode)); | |
f433dc56 DV |
189 | mark_buffer_dirty(bh); |
190 | brelse(bh); | |
191 | ||
fac92bec | 192 | if (bi->i_dsk_ino) { |
7e46aa5c AV |
193 | if (bi->i_sblock) |
194 | info->si_freeb += bi->i_eblock + 1 - bi->i_sblock; | |
1da177e4 | 195 | info->si_freei++; |
fac92bec | 196 | clear_bit(ino, info->si_imap); |
1da177e4 | 197 | dump_imap("delete_inode", s); |
fac92bec | 198 | } |
1da177e4 | 199 | |
f433dc56 DV |
200 | /* |
201 | * If this was the last file, make the previous block | |
202 | * "last block of the last file" even if there is no | |
203 | * real file there, saves us 1 gap. | |
204 | */ | |
4e29d50a | 205 | if (info->si_lf_eblk == bi->i_eblock) |
f433dc56 | 206 | info->si_lf_eblk = bi->i_sblock - 1; |
3f165e4c | 207 | mutex_unlock(&info->bfs_lock); |
1da177e4 LT |
208 | } |
209 | ||
210 | static void bfs_put_super(struct super_block *s) | |
211 | { | |
212 | struct bfs_sb_info *info = BFS_SB(s); | |
3f165e4c | 213 | |
e1f89ec9 ES |
214 | if (!info) |
215 | return; | |
216 | ||
3f165e4c | 217 | mutex_destroy(&info->bfs_lock); |
1da177e4 LT |
218 | kfree(info->si_imap); |
219 | kfree(info); | |
220 | s->s_fs_info = NULL; | |
221 | } | |
222 | ||
726c3342 | 223 | static int bfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 224 | { |
726c3342 | 225 | struct super_block *s = dentry->d_sb; |
1da177e4 LT |
226 | struct bfs_sb_info *info = BFS_SB(s); |
227 | u64 id = huge_encode_dev(s->s_bdev->bd_dev); | |
228 | buf->f_type = BFS_MAGIC; | |
229 | buf->f_bsize = s->s_blocksize; | |
230 | buf->f_blocks = info->si_blocks; | |
231 | buf->f_bfree = buf->f_bavail = info->si_freeb; | |
232 | buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO; | |
233 | buf->f_ffree = info->si_freei; | |
234 | buf->f_fsid.val[0] = (u32)id; | |
235 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
236 | buf->f_namelen = BFS_NAMELEN; | |
237 | return 0; | |
238 | } | |
239 | ||
f433dc56 | 240 | static struct kmem_cache *bfs_inode_cachep; |
1da177e4 LT |
241 | |
242 | static struct inode *bfs_alloc_inode(struct super_block *sb) | |
243 | { | |
244 | struct bfs_inode_info *bi; | |
e94b1766 | 245 | bi = kmem_cache_alloc(bfs_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
246 | if (!bi) |
247 | return NULL; | |
248 | return &bi->vfs_inode; | |
249 | } | |
250 | ||
fa0d7e3d | 251 | static void bfs_i_callback(struct rcu_head *head) |
1da177e4 | 252 | { |
fa0d7e3d | 253 | struct inode *inode = container_of(head, struct inode, i_rcu); |
1da177e4 LT |
254 | kmem_cache_free(bfs_inode_cachep, BFS_I(inode)); |
255 | } | |
256 | ||
fa0d7e3d NP |
257 | static void bfs_destroy_inode(struct inode *inode) |
258 | { | |
259 | call_rcu(&inode->i_rcu, bfs_i_callback); | |
260 | } | |
261 | ||
51cc5068 | 262 | static void init_once(void *foo) |
1da177e4 LT |
263 | { |
264 | struct bfs_inode_info *bi = foo; | |
265 | ||
a35afb83 | 266 | inode_init_once(&bi->vfs_inode); |
1da177e4 | 267 | } |
20c2df83 | 268 | |
1da177e4 LT |
269 | static int init_inodecache(void) |
270 | { | |
271 | bfs_inode_cachep = kmem_cache_create("bfs_inode_cache", | |
272 | sizeof(struct bfs_inode_info), | |
fffb60f9 PJ |
273 | 0, (SLAB_RECLAIM_ACCOUNT| |
274 | SLAB_MEM_SPREAD), | |
20c2df83 | 275 | init_once); |
1da177e4 LT |
276 | if (bfs_inode_cachep == NULL) |
277 | return -ENOMEM; | |
278 | return 0; | |
279 | } | |
280 | ||
281 | static void destroy_inodecache(void) | |
282 | { | |
1a1d92c1 | 283 | kmem_cache_destroy(bfs_inode_cachep); |
1da177e4 LT |
284 | } |
285 | ||
ee9b6d61 | 286 | static const struct super_operations bfs_sops = { |
1da177e4 LT |
287 | .alloc_inode = bfs_alloc_inode, |
288 | .destroy_inode = bfs_destroy_inode, | |
1da177e4 | 289 | .write_inode = bfs_write_inode, |
9df2f851 | 290 | .evict_inode = bfs_evict_inode, |
1da177e4 | 291 | .put_super = bfs_put_super, |
1da177e4 LT |
292 | .statfs = bfs_statfs, |
293 | }; | |
294 | ||
f433dc56 | 295 | void dump_imap(const char *prefix, struct super_block *s) |
1da177e4 | 296 | { |
fac92bec | 297 | #ifdef DEBUG |
1da177e4 LT |
298 | int i; |
299 | char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL); | |
300 | ||
301 | if (!tmpbuf) | |
302 | return; | |
f433dc56 DV |
303 | for (i = BFS_SB(s)->si_lasti; i >= 0; i--) { |
304 | if (i > PAGE_SIZE - 100) break; | |
1da177e4 LT |
305 | if (test_bit(i, BFS_SB(s)->si_imap)) |
306 | strcat(tmpbuf, "1"); | |
307 | else | |
308 | strcat(tmpbuf, "0"); | |
309 | } | |
f433dc56 DV |
310 | printf("BFS-fs: %s: lasti=%08lx <%s>\n", |
311 | prefix, BFS_SB(s)->si_lasti, tmpbuf); | |
1da177e4 LT |
312 | free_page((unsigned long)tmpbuf); |
313 | #endif | |
314 | } | |
315 | ||
316 | static int bfs_fill_super(struct super_block *s, void *data, int silent) | |
317 | { | |
4e29d50a | 318 | struct buffer_head *bh, *sbh; |
f433dc56 DV |
319 | struct bfs_super_block *bfs_sb; |
320 | struct inode *inode; | |
fac92bec | 321 | unsigned i, imap_len; |
f433dc56 | 322 | struct bfs_sb_info *info; |
5998649f | 323 | int ret = -EINVAL; |
e1f89ec9 | 324 | unsigned long i_sblock, i_eblock, i_eoff, s_size; |
1da177e4 | 325 | |
f8314dc6 | 326 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
ba13d597 | 327 | if (!info) |
1da177e4 | 328 | return -ENOMEM; |
5998649f | 329 | mutex_init(&info->bfs_lock); |
1da177e4 | 330 | s->s_fs_info = info; |
1da177e4 LT |
331 | |
332 | sb_set_blocksize(s, BFS_BSIZE); | |
333 | ||
4e29d50a AB |
334 | sbh = sb_bread(s, 0); |
335 | if (!sbh) | |
1da177e4 | 336 | goto out; |
4e29d50a | 337 | bfs_sb = (struct bfs_super_block *)sbh->b_data; |
fac92bec | 338 | if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) { |
1da177e4 LT |
339 | if (!silent) |
340 | printf("No BFS filesystem on %s (magic=%08x)\n", | |
fac92bec | 341 | s->s_id, le32_to_cpu(bfs_sb->s_magic)); |
5998649f | 342 | goto out1; |
1da177e4 LT |
343 | } |
344 | if (BFS_UNCLEAN(bfs_sb, s) && !silent) | |
345 | printf("%s is unclean, continuing\n", s->s_id); | |
346 | ||
347 | s->s_magic = BFS_MAGIC; | |
e1f89ec9 ES |
348 | |
349 | if (le32_to_cpu(bfs_sb->s_start) > le32_to_cpu(bfs_sb->s_end)) { | |
350 | printf("Superblock is corrupted\n"); | |
5998649f | 351 | goto out1; |
e1f89ec9 ES |
352 | } |
353 | ||
f433dc56 DV |
354 | info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE) / |
355 | sizeof(struct bfs_inode) | |
356 | + BFS_ROOT_INO - 1; | |
357 | imap_len = (info->si_lasti / 8) + 1; | |
f8314dc6 | 358 | info->si_imap = kzalloc(imap_len, GFP_KERNEL); |
1da177e4 | 359 | if (!info->si_imap) |
5998649f | 360 | goto out1; |
f433dc56 | 361 | for (i = 0; i < BFS_ROOT_INO; i++) |
1da177e4 LT |
362 | set_bit(i, info->si_imap); |
363 | ||
364 | s->s_op = &bfs_sops; | |
e33ab086 DH |
365 | inode = bfs_iget(s, BFS_ROOT_INO); |
366 | if (IS_ERR(inode)) { | |
367 | ret = PTR_ERR(inode); | |
5998649f | 368 | goto out2; |
1da177e4 | 369 | } |
48fde701 | 370 | s->s_root = d_make_root(inode); |
1da177e4 | 371 | if (!s->s_root) { |
e33ab086 | 372 | ret = -ENOMEM; |
5998649f | 373 | goto out2; |
1da177e4 LT |
374 | } |
375 | ||
f433dc56 DV |
376 | info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS; |
377 | info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1 | |
378 | - le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS; | |
1da177e4 LT |
379 | info->si_freei = 0; |
380 | info->si_lf_eblk = 0; | |
50682bb4 ES |
381 | |
382 | /* can we read the last block? */ | |
383 | bh = sb_bread(s, info->si_blocks - 1); | |
384 | if (!bh) { | |
385 | printf("Last block not available: %lu\n", info->si_blocks - 1); | |
50682bb4 | 386 | ret = -EIO; |
5998649f | 387 | goto out3; |
50682bb4 ES |
388 | } |
389 | brelse(bh); | |
390 | ||
c2b513df | 391 | bh = NULL; |
f433dc56 | 392 | for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) { |
c2b513df | 393 | struct bfs_inode *di; |
f433dc56 | 394 | int block = (i - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1; |
c2b513df | 395 | int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK; |
75b25b4c | 396 | unsigned long eblock; |
c2b513df AV |
397 | |
398 | if (!off) { | |
399 | brelse(bh); | |
400 | bh = sb_bread(s, block); | |
401 | } | |
402 | ||
403 | if (!bh) | |
404 | continue; | |
405 | ||
406 | di = (struct bfs_inode *)bh->b_data + off; | |
407 | ||
e1f89ec9 ES |
408 | /* test if filesystem is not corrupted */ |
409 | ||
410 | i_eoff = le32_to_cpu(di->i_eoffset); | |
411 | i_sblock = le32_to_cpu(di->i_sblock); | |
412 | i_eblock = le32_to_cpu(di->i_eblock); | |
413 | s_size = le32_to_cpu(bfs_sb->s_end); | |
414 | ||
415 | if (i_sblock > info->si_blocks || | |
416 | i_eblock > info->si_blocks || | |
417 | i_sblock > i_eblock || | |
418 | i_eoff > s_size || | |
419 | i_sblock * BFS_BSIZE > i_eoff) { | |
420 | ||
421 | printf("Inode 0x%08x corrupted\n", i); | |
422 | ||
423 | brelse(bh); | |
5998649f AV |
424 | ret = -EIO; |
425 | goto out3; | |
e1f89ec9 ES |
426 | } |
427 | ||
c2b513df | 428 | if (!di->i_ino) { |
1da177e4 | 429 | info->si_freei++; |
c2b513df AV |
430 | continue; |
431 | } | |
432 | set_bit(i, info->si_imap); | |
433 | info->si_freeb -= BFS_FILEBLOCKS(di); | |
434 | ||
c2b513df | 435 | eblock = le32_to_cpu(di->i_eblock); |
f433dc56 | 436 | if (eblock > info->si_lf_eblk) |
c2b513df | 437 | info->si_lf_eblk = eblock; |
1da177e4 | 438 | } |
c2b513df | 439 | brelse(bh); |
4e29d50a | 440 | brelse(sbh); |
1da177e4 LT |
441 | dump_imap("read_super", s); |
442 | return 0; | |
443 | ||
5998649f AV |
444 | out3: |
445 | dput(s->s_root); | |
446 | s->s_root = NULL; | |
447 | out2: | |
448 | kfree(info->si_imap); | |
449 | out1: | |
4e29d50a | 450 | brelse(sbh); |
1da177e4 | 451 | out: |
5998649f | 452 | mutex_destroy(&info->bfs_lock); |
1da177e4 LT |
453 | kfree(info); |
454 | s->s_fs_info = NULL; | |
e33ab086 | 455 | return ret; |
1da177e4 LT |
456 | } |
457 | ||
152a0836 AV |
458 | static struct dentry *bfs_mount(struct file_system_type *fs_type, |
459 | int flags, const char *dev_name, void *data) | |
1da177e4 | 460 | { |
152a0836 | 461 | return mount_bdev(fs_type, flags, dev_name, data, bfs_fill_super); |
1da177e4 LT |
462 | } |
463 | ||
464 | static struct file_system_type bfs_fs_type = { | |
465 | .owner = THIS_MODULE, | |
466 | .name = "bfs", | |
152a0836 | 467 | .mount = bfs_mount, |
1da177e4 LT |
468 | .kill_sb = kill_block_super, |
469 | .fs_flags = FS_REQUIRES_DEV, | |
470 | }; | |
471 | ||
472 | static int __init init_bfs_fs(void) | |
473 | { | |
474 | int err = init_inodecache(); | |
475 | if (err) | |
476 | goto out1; | |
477 | err = register_filesystem(&bfs_fs_type); | |
478 | if (err) | |
479 | goto out; | |
480 | return 0; | |
481 | out: | |
482 | destroy_inodecache(); | |
483 | out1: | |
484 | return err; | |
485 | } | |
486 | ||
487 | static void __exit exit_bfs_fs(void) | |
488 | { | |
489 | unregister_filesystem(&bfs_fs_type); | |
490 | destroy_inodecache(); | |
491 | } | |
492 | ||
493 | module_init(init_bfs_fs) | |
494 | module_exit(exit_bfs_fs) |