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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/befs/linuxvfs.c | |
3 | * | |
4 | * Copyright (C) 2001 Will Dyson <will_dyson@pobox.com | |
5 | * | |
6 | */ | |
7 | ||
dac52fc1 FF |
8 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
9 | ||
1da177e4 LT |
10 | #include <linux/module.h> |
11 | #include <linux/slab.h> | |
12 | #include <linux/fs.h> | |
13 | #include <linux/errno.h> | |
14 | #include <linux/stat.h> | |
15 | #include <linux/nls.h> | |
16 | #include <linux/buffer_head.h> | |
17 | #include <linux/vfs.h> | |
18 | #include <linux/parser.h> | |
19 | #include <linux/namei.h> | |
31aba059 | 20 | #include <linux/sched.h> |
5b825c3a | 21 | #include <linux/cred.h> |
ac632f5b | 22 | #include <linux/exportfs.h> |
3ab7947a | 23 | #include <linux/seq_file.h> |
1da177e4 LT |
24 | |
25 | #include "befs.h" | |
26 | #include "btree.h" | |
27 | #include "inode.h" | |
28 | #include "datastream.h" | |
29 | #include "super.h" | |
30 | #include "io.h" | |
1da177e4 LT |
31 | |
32 | MODULE_DESCRIPTION("BeOS File System (BeFS) driver"); | |
33 | MODULE_AUTHOR("Will Dyson"); | |
34 | MODULE_LICENSE("GPL"); | |
35 | ||
36 | /* The units the vfs expects inode->i_blocks to be in */ | |
37 | #define VFS_BLOCK_SIZE 512 | |
38 | ||
f0f49ef5 | 39 | static int befs_readdir(struct file *, struct dir_context *); |
1da177e4 LT |
40 | static int befs_get_block(struct inode *, sector_t, struct buffer_head *, int); |
41 | static int befs_readpage(struct file *file, struct page *page); | |
42 | static sector_t befs_bmap(struct address_space *mapping, sector_t block); | |
62b80719 LB |
43 | static struct dentry *befs_lookup(struct inode *, struct dentry *, |
44 | unsigned int); | |
96eb5419 | 45 | static struct inode *befs_iget(struct super_block *, unsigned long); |
1da177e4 | 46 | static struct inode *befs_alloc_inode(struct super_block *sb); |
49f82a80 | 47 | static void befs_free_inode(struct inode *inode); |
1da177e4 | 48 | static void befs_destroy_inodecache(void); |
11803f97 | 49 | static int befs_symlink_readpage(struct file *, struct page *); |
1da177e4 LT |
50 | static int befs_utf2nls(struct super_block *sb, const char *in, int in_len, |
51 | char **out, int *out_len); | |
52 | static int befs_nls2utf(struct super_block *sb, const char *in, int in_len, | |
53 | char **out, int *out_len); | |
54 | static void befs_put_super(struct super_block *); | |
55 | static int befs_remount(struct super_block *, int *, char *); | |
726c3342 | 56 | static int befs_statfs(struct dentry *, struct kstatfs *); |
3ab7947a | 57 | static int befs_show_options(struct seq_file *, struct dentry *); |
09ad0eae | 58 | static int parse_options(char *, struct befs_mount_options *); |
ac632f5b LB |
59 | static struct dentry *befs_fh_to_dentry(struct super_block *sb, |
60 | struct fid *fid, int fh_len, int fh_type); | |
61 | static struct dentry *befs_fh_to_parent(struct super_block *sb, | |
62 | struct fid *fid, int fh_len, int fh_type); | |
dcfd9b21 | 63 | static struct dentry *befs_get_parent(struct dentry *child); |
1da177e4 LT |
64 | |
65 | static const struct super_operations befs_sops = { | |
1da177e4 | 66 | .alloc_inode = befs_alloc_inode, /* allocate a new inode */ |
49f82a80 | 67 | .free_inode = befs_free_inode, /* deallocate an inode */ |
1da177e4 LT |
68 | .put_super = befs_put_super, /* uninit super */ |
69 | .statfs = befs_statfs, /* statfs */ | |
70 | .remount_fs = befs_remount, | |
3ab7947a | 71 | .show_options = befs_show_options, |
1da177e4 LT |
72 | }; |
73 | ||
74 | /* slab cache for befs_inode_info objects */ | |
e18b890b | 75 | static struct kmem_cache *befs_inode_cachep; |
1da177e4 | 76 | |
4b6f5d20 | 77 | static const struct file_operations befs_dir_operations = { |
1da177e4 | 78 | .read = generic_read_dir, |
e23e9aa7 | 79 | .iterate_shared = befs_readdir, |
59af1584 | 80 | .llseek = generic_file_llseek, |
1da177e4 LT |
81 | }; |
82 | ||
754661f1 | 83 | static const struct inode_operations befs_dir_inode_operations = { |
1da177e4 LT |
84 | .lookup = befs_lookup, |
85 | }; | |
86 | ||
f5e54d6e | 87 | static const struct address_space_operations befs_aops = { |
1da177e4 | 88 | .readpage = befs_readpage, |
1da177e4 LT |
89 | .bmap = befs_bmap, |
90 | }; | |
91 | ||
11803f97 AV |
92 | static const struct address_space_operations befs_symlink_aops = { |
93 | .readpage = befs_symlink_readpage, | |
1da177e4 LT |
94 | }; |
95 | ||
ac632f5b LB |
96 | static const struct export_operations befs_export_operations = { |
97 | .fh_to_dentry = befs_fh_to_dentry, | |
98 | .fh_to_parent = befs_fh_to_parent, | |
dcfd9b21 | 99 | .get_parent = befs_get_parent, |
ac632f5b LB |
100 | }; |
101 | ||
e60f749b | 102 | /* |
1da177e4 | 103 | * Called by generic_file_read() to read a page of data |
e60f749b | 104 | * |
1da177e4 LT |
105 | * In turn, simply calls a generic block read function and |
106 | * passes it the address of befs_get_block, for mapping file | |
107 | * positions to disk blocks. | |
108 | */ | |
109 | static int | |
110 | befs_readpage(struct file *file, struct page *page) | |
111 | { | |
112 | return block_read_full_page(page, befs_get_block); | |
113 | } | |
114 | ||
115 | static sector_t | |
116 | befs_bmap(struct address_space *mapping, sector_t block) | |
117 | { | |
118 | return generic_block_bmap(mapping, block, befs_get_block); | |
119 | } | |
120 | ||
e60f749b LB |
121 | /* |
122 | * Generic function to map a file position (block) to a | |
1da177e4 LT |
123 | * disk offset (passed back in bh_result). |
124 | * | |
125 | * Used by many higher level functions. | |
126 | * | |
127 | * Calls befs_fblock2brun() in datastream.c to do the real work. | |
1da177e4 LT |
128 | */ |
129 | ||
130 | static int | |
131 | befs_get_block(struct inode *inode, sector_t block, | |
132 | struct buffer_head *bh_result, int create) | |
133 | { | |
134 | struct super_block *sb = inode->i_sb; | |
135 | befs_data_stream *ds = &BEFS_I(inode)->i_data.ds; | |
136 | befs_block_run run = BAD_IADDR; | |
abcf9116 | 137 | int res; |
1da177e4 LT |
138 | ulong disk_off; |
139 | ||
140 | befs_debug(sb, "---> befs_get_block() for inode %lu, block %ld", | |
dac52fc1 | 141 | (unsigned long)inode->i_ino, (long)block); |
1da177e4 LT |
142 | if (create) { |
143 | befs_error(sb, "befs_get_block() was asked to write to " | |
dac52fc1 FF |
144 | "block %ld in inode %lu", (long)block, |
145 | (unsigned long)inode->i_ino); | |
1da177e4 LT |
146 | return -EPERM; |
147 | } | |
148 | ||
149 | res = befs_fblock2brun(sb, ds, block, &run); | |
150 | if (res != BEFS_OK) { | |
151 | befs_error(sb, | |
dac52fc1 FF |
152 | "<--- %s for inode %lu, block %ld ERROR", |
153 | __func__, (unsigned long)inode->i_ino, | |
154 | (long)block); | |
1da177e4 LT |
155 | return -EFBIG; |
156 | } | |
157 | ||
158 | disk_off = (ulong) iaddr2blockno(sb, &run); | |
159 | ||
160 | map_bh(bh_result, inode->i_sb, disk_off); | |
161 | ||
dac52fc1 FF |
162 | befs_debug(sb, "<--- %s for inode %lu, block %ld, disk address %lu", |
163 | __func__, (unsigned long)inode->i_ino, (long)block, | |
164 | (unsigned long)disk_off); | |
1da177e4 LT |
165 | |
166 | return 0; | |
167 | } | |
168 | ||
169 | static struct dentry * | |
00cd8dd3 | 170 | befs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) |
1da177e4 | 171 | { |
c9408763 | 172 | struct inode *inode; |
1da177e4 | 173 | struct super_block *sb = dir->i_sb; |
22341d8f | 174 | const befs_data_stream *ds = &BEFS_I(dir)->i_data.ds; |
1da177e4 LT |
175 | befs_off_t offset; |
176 | int ret; | |
177 | int utfnamelen; | |
178 | char *utfname; | |
179 | const char *name = dentry->d_name.name; | |
180 | ||
a455589f AV |
181 | befs_debug(sb, "---> %s name %pd inode %ld", __func__, |
182 | dentry, dir->i_ino); | |
1da177e4 LT |
183 | |
184 | /* Convert to UTF-8 */ | |
185 | if (BEFS_SB(sb)->nls) { | |
186 | ret = | |
187 | befs_nls2utf(sb, name, strlen(name), &utfname, &utfnamelen); | |
188 | if (ret < 0) { | |
dac52fc1 | 189 | befs_debug(sb, "<--- %s ERROR", __func__); |
1da177e4 LT |
190 | return ERR_PTR(ret); |
191 | } | |
192 | ret = befs_btree_find(sb, ds, utfname, &offset); | |
193 | kfree(utfname); | |
194 | ||
195 | } else { | |
f7769f9c | 196 | ret = befs_btree_find(sb, ds, name, &offset); |
1da177e4 LT |
197 | } |
198 | ||
199 | if (ret == BEFS_BT_NOT_FOUND) { | |
a455589f | 200 | befs_debug(sb, "<--- %s %pd not found", __func__, dentry); |
f4e4d434 | 201 | inode = NULL; |
1da177e4 | 202 | } else if (ret != BEFS_OK || offset == 0) { |
4c3897cc | 203 | befs_error(sb, "<--- %s Error", __func__); |
f4e4d434 AV |
204 | inode = ERR_PTR(-ENODATA); |
205 | } else { | |
206 | inode = befs_iget(dir->i_sb, (ino_t) offset); | |
1da177e4 | 207 | } |
dac52fc1 | 208 | befs_debug(sb, "<--- %s", __func__); |
1da177e4 | 209 | |
f4e4d434 | 210 | return d_splice_alias(inode, dentry); |
1da177e4 LT |
211 | } |
212 | ||
213 | static int | |
f0f49ef5 | 214 | befs_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 215 | { |
f0f49ef5 | 216 | struct inode *inode = file_inode(file); |
1da177e4 | 217 | struct super_block *sb = inode->i_sb; |
22341d8f | 218 | const befs_data_stream *ds = &BEFS_I(inode)->i_data.ds; |
1da177e4 LT |
219 | befs_off_t value; |
220 | int result; | |
221 | size_t keysize; | |
1da177e4 | 222 | char keybuf[BEFS_NAME_LEN + 1]; |
1da177e4 | 223 | |
a455589f AV |
224 | befs_debug(sb, "---> %s name %pD, inode %ld, ctx->pos %lld", |
225 | __func__, file, inode->i_ino, ctx->pos); | |
1da177e4 | 226 | |
9ae51a32 LB |
227 | while (1) { |
228 | result = befs_btree_read(sb, ds, ctx->pos, BEFS_NAME_LEN + 1, | |
229 | keybuf, &keysize, &value); | |
1da177e4 | 230 | |
9ae51a32 | 231 | if (result == BEFS_ERR) { |
dac52fc1 | 232 | befs_debug(sb, "<--- %s ERROR", __func__); |
9ae51a32 LB |
233 | befs_error(sb, "IO error reading %pD (inode %lu)", |
234 | file, inode->i_ino); | |
235 | return -EIO; | |
1da177e4 | 236 | |
9ae51a32 LB |
237 | } else if (result == BEFS_BT_END) { |
238 | befs_debug(sb, "<--- %s END", __func__); | |
239 | return 0; | |
1da177e4 | 240 | |
9ae51a32 LB |
241 | } else if (result == BEFS_BT_EMPTY) { |
242 | befs_debug(sb, "<--- %s Empty directory", __func__); | |
243 | return 0; | |
1da177e4 | 244 | } |
9ae51a32 LB |
245 | |
246 | /* Convert to NLS */ | |
247 | if (BEFS_SB(sb)->nls) { | |
248 | char *nlsname; | |
249 | int nlsnamelen; | |
250 | ||
251 | result = | |
252 | befs_utf2nls(sb, keybuf, keysize, &nlsname, | |
253 | &nlsnamelen); | |
254 | if (result < 0) { | |
255 | befs_debug(sb, "<--- %s ERROR", __func__); | |
256 | return result; | |
257 | } | |
258 | if (!dir_emit(ctx, nlsname, nlsnamelen, | |
259 | (ino_t) value, DT_UNKNOWN)) { | |
260 | kfree(nlsname); | |
261 | return 0; | |
262 | } | |
f0f49ef5 | 263 | kfree(nlsname); |
9ae51a32 LB |
264 | } else { |
265 | if (!dir_emit(ctx, keybuf, keysize, | |
266 | (ino_t) value, DT_UNKNOWN)) | |
267 | return 0; | |
f0f49ef5 | 268 | } |
9ae51a32 | 269 | ctx->pos++; |
1da177e4 | 270 | } |
1da177e4 LT |
271 | } |
272 | ||
273 | static struct inode * | |
274 | befs_alloc_inode(struct super_block *sb) | |
275 | { | |
111d639d FF |
276 | struct befs_inode_info *bi; |
277 | ||
278 | bi = kmem_cache_alloc(befs_inode_cachep, GFP_KERNEL); | |
62b80719 LB |
279 | if (!bi) |
280 | return NULL; | |
281 | return &bi->vfs_inode; | |
1da177e4 LT |
282 | } |
283 | ||
49f82a80 | 284 | static void befs_free_inode(struct inode *inode) |
1da177e4 | 285 | { |
62b80719 | 286 | kmem_cache_free(befs_inode_cachep, BEFS_I(inode)); |
1da177e4 LT |
287 | } |
288 | ||
51cc5068 | 289 | static void init_once(void *foo) |
1da177e4 | 290 | { |
62b80719 | 291 | struct befs_inode_info *bi = (struct befs_inode_info *) foo; |
a35afb83 CL |
292 | |
293 | inode_init_once(&bi->vfs_inode); | |
1da177e4 LT |
294 | } |
295 | ||
96eb5419 | 296 | static struct inode *befs_iget(struct super_block *sb, unsigned long ino) |
1da177e4 | 297 | { |
e4c7f5b1 | 298 | struct buffer_head *bh; |
44ad8098 | 299 | befs_inode *raw_inode; |
038428fc | 300 | struct befs_sb_info *befs_sb = BEFS_SB(sb); |
d6e02033 | 301 | struct befs_inode_info *befs_ino; |
96eb5419 | 302 | struct inode *inode; |
1da177e4 | 303 | |
dac52fc1 | 304 | befs_debug(sb, "---> %s inode = %lu", __func__, ino); |
96eb5419 DH |
305 | |
306 | inode = iget_locked(sb, ino); | |
ac34a1b3 RP |
307 | if (!inode) |
308 | return ERR_PTR(-ENOMEM); | |
96eb5419 DH |
309 | if (!(inode->i_state & I_NEW)) |
310 | return inode; | |
1da177e4 LT |
311 | |
312 | befs_ino = BEFS_I(inode); | |
313 | ||
314 | /* convert from vfs's inode number to befs's inode number */ | |
315 | befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino); | |
316 | ||
317 | befs_debug(sb, " real inode number [%u, %hu, %hu]", | |
318 | befs_ino->i_inode_num.allocation_group, | |
319 | befs_ino->i_inode_num.start, befs_ino->i_inode_num.len); | |
320 | ||
f7f67540 | 321 | bh = sb_bread(sb, inode->i_ino); |
1da177e4 LT |
322 | if (!bh) { |
323 | befs_error(sb, "unable to read inode block - " | |
324 | "inode = %lu", inode->i_ino); | |
0418726b | 325 | goto unacquire_none; |
1da177e4 LT |
326 | } |
327 | ||
328 | raw_inode = (befs_inode *) bh->b_data; | |
329 | ||
330 | befs_dump_inode(sb, raw_inode); | |
331 | ||
332 | if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) { | |
333 | befs_error(sb, "Bad inode: %lu", inode->i_ino); | |
0418726b | 334 | goto unacquire_bh; |
1da177e4 LT |
335 | } |
336 | ||
337 | inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode); | |
338 | ||
339 | /* | |
340 | * set uid and gid. But since current BeOS is single user OS, so | |
341 | * you can change by "uid" or "gid" options. | |
e60f749b | 342 | */ |
1da177e4 LT |
343 | |
344 | inode->i_uid = befs_sb->mount_opts.use_uid ? | |
31aba059 EB |
345 | befs_sb->mount_opts.uid : |
346 | make_kuid(&init_user_ns, fs32_to_cpu(sb, raw_inode->uid)); | |
1da177e4 | 347 | inode->i_gid = befs_sb->mount_opts.use_gid ? |
31aba059 EB |
348 | befs_sb->mount_opts.gid : |
349 | make_kgid(&init_user_ns, fs32_to_cpu(sb, raw_inode->gid)); | |
1da177e4 | 350 | |
bfe86848 | 351 | set_nlink(inode, 1); |
1da177e4 LT |
352 | |
353 | /* | |
354 | * BEFS's time is 64 bits, but current VFS is 32 bits... | |
355 | * BEFS don't have access time. Nor inode change time. VFS | |
356 | * doesn't have creation time. | |
e60f749b | 357 | * Also, the lower 16 bits of the last_modified_time and |
1da177e4 LT |
358 | * create_time are just a counter to help ensure uniqueness |
359 | * for indexing purposes. (PFD, page 54) | |
360 | */ | |
361 | ||
362 | inode->i_mtime.tv_sec = | |
363 | fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16; | |
e60f749b | 364 | inode->i_mtime.tv_nsec = 0; /* lower 16 bits are not a time */ |
1da177e4 LT |
365 | inode->i_ctime = inode->i_mtime; |
366 | inode->i_atime = inode->i_mtime; | |
1da177e4 LT |
367 | |
368 | befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num); | |
369 | befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent); | |
370 | befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes); | |
371 | befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags); | |
372 | ||
373 | if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){ | |
374 | inode->i_size = 0; | |
375 | inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE; | |
39d7a29f FF |
376 | strlcpy(befs_ino->i_data.symlink, raw_inode->data.symlink, |
377 | BEFS_SYMLINK_LEN); | |
1da177e4 LT |
378 | } else { |
379 | int num_blks; | |
380 | ||
381 | befs_ino->i_data.ds = | |
e0e3d32b | 382 | fsds_to_cpu(sb, &raw_inode->data.datastream); |
1da177e4 LT |
383 | |
384 | num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds); | |
385 | inode->i_blocks = | |
386 | num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE); | |
387 | inode->i_size = befs_ino->i_data.ds.size; | |
388 | } | |
389 | ||
390 | inode->i_mapping->a_ops = &befs_aops; | |
391 | ||
392 | if (S_ISREG(inode->i_mode)) { | |
2cf06916 | 393 | inode->i_fop = &generic_ro_fops; |
1da177e4 LT |
394 | } else if (S_ISDIR(inode->i_mode)) { |
395 | inode->i_op = &befs_dir_inode_operations; | |
396 | inode->i_fop = &befs_dir_operations; | |
397 | } else if (S_ISLNK(inode->i_mode)) { | |
d0deec19 | 398 | if (befs_ino->i_flags & BEFS_LONG_SYMLINK) { |
11803f97 | 399 | inode->i_op = &page_symlink_inode_operations; |
21fc61c7 | 400 | inode_nohighmem(inode); |
11803f97 | 401 | inode->i_mapping->a_ops = &befs_symlink_aops; |
d0deec19 AV |
402 | } else { |
403 | inode->i_link = befs_ino->i_data.symlink; | |
404 | inode->i_op = &simple_symlink_inode_operations; | |
405 | } | |
1da177e4 LT |
406 | } else { |
407 | befs_error(sb, "Inode %lu is not a regular file, " | |
408 | "directory or symlink. THAT IS WRONG! BeFS has no " | |
409 | "on disk special files", inode->i_ino); | |
0418726b | 410 | goto unacquire_bh; |
1da177e4 LT |
411 | } |
412 | ||
413 | brelse(bh); | |
dac52fc1 | 414 | befs_debug(sb, "<--- %s", __func__); |
96eb5419 DH |
415 | unlock_new_inode(inode); |
416 | return inode; | |
1da177e4 | 417 | |
62b80719 | 418 | unacquire_bh: |
1da177e4 LT |
419 | brelse(bh); |
420 | ||
62b80719 | 421 | unacquire_none: |
96eb5419 | 422 | iget_failed(inode); |
dac52fc1 | 423 | befs_debug(sb, "<--- %s - Bad inode", __func__); |
33c712b4 | 424 | return ERR_PTR(-EIO); |
1da177e4 LT |
425 | } |
426 | ||
427 | /* Initialize the inode cache. Called at fs setup. | |
20c2df83 | 428 | * |
1da177e4 LT |
429 | * Taken from NFS implementation by Al Viro. |
430 | */ | |
91a52ab7 | 431 | static int __init |
1da177e4 LT |
432 | befs_init_inodecache(void) |
433 | { | |
0fc256d3 DW |
434 | befs_inode_cachep = kmem_cache_create_usercopy("befs_inode_cache", |
435 | sizeof(struct befs_inode_info), 0, | |
436 | (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD| | |
437 | SLAB_ACCOUNT), | |
438 | offsetof(struct befs_inode_info, | |
439 | i_data.symlink), | |
440 | sizeof_field(struct befs_inode_info, | |
441 | i_data.symlink), | |
442 | init_once); | |
c08f1cb6 | 443 | if (befs_inode_cachep == NULL) |
1da177e4 | 444 | return -ENOMEM; |
c08f1cb6 | 445 | |
1da177e4 LT |
446 | return 0; |
447 | } | |
448 | ||
449 | /* Called at fs teardown. | |
e60f749b | 450 | * |
1da177e4 LT |
451 | * Taken from NFS implementation by Al Viro. |
452 | */ | |
453 | static void | |
454 | befs_destroy_inodecache(void) | |
455 | { | |
8c0a8537 KS |
456 | /* |
457 | * Make sure all delayed rcu free inodes are flushed before we | |
458 | * destroy cache. | |
459 | */ | |
460 | rcu_barrier(); | |
1a1d92c1 | 461 | kmem_cache_destroy(befs_inode_cachep); |
1da177e4 LT |
462 | } |
463 | ||
464 | /* | |
465 | * The inode of symbolic link is different to data stream. | |
466 | * The data stream become link name. Unless the LONG_SYMLINK | |
467 | * flag is set. | |
468 | */ | |
11803f97 | 469 | static int befs_symlink_readpage(struct file *unused, struct page *page) |
1da177e4 | 470 | { |
11803f97 AV |
471 | struct inode *inode = page->mapping->host; |
472 | struct super_block *sb = inode->i_sb; | |
473 | struct befs_inode_info *befs_ino = BEFS_I(inode); | |
48bc06e7 AV |
474 | befs_data_stream *data = &befs_ino->i_data.ds; |
475 | befs_off_t len = data->size; | |
21fc61c7 | 476 | char *link = page_address(page); |
1da177e4 | 477 | |
11803f97 | 478 | if (len == 0 || len > PAGE_SIZE) { |
48bc06e7 | 479 | befs_error(sb, "Long symlink with illegal length"); |
11803f97 | 480 | goto fail; |
1da177e4 | 481 | } |
680baacb AV |
482 | befs_debug(sb, "Follow long symlink"); |
483 | ||
680baacb | 484 | if (befs_read_lsymlink(sb, data, link, len) != len) { |
680baacb | 485 | befs_error(sb, "Failed to read entire long symlink"); |
11803f97 | 486 | goto fail; |
680baacb AV |
487 | } |
488 | link[len - 1] = '\0'; | |
11803f97 | 489 | SetPageUptodate(page); |
11803f97 AV |
490 | unlock_page(page); |
491 | return 0; | |
492 | fail: | |
493 | SetPageError(page); | |
11803f97 AV |
494 | unlock_page(page); |
495 | return -EIO; | |
1da177e4 LT |
496 | } |
497 | ||
1da177e4 | 498 | /* |
1ca7087e | 499 | * UTF-8 to NLS charset convert routine |
e60f749b | 500 | * |
1ca7087e | 501 | * Uses uni2char() / char2uni() rather than the nls tables directly |
1da177e4 | 502 | */ |
1da177e4 LT |
503 | static int |
504 | befs_utf2nls(struct super_block *sb, const char *in, | |
505 | int in_len, char **out, int *out_len) | |
506 | { | |
507 | struct nls_table *nls = BEFS_SB(sb)->nls; | |
508 | int i, o; | |
74675a58 | 509 | unicode_t uni; |
1da177e4 LT |
510 | int unilen, utflen; |
511 | char *result; | |
94f563c4 DC |
512 | /* The utf8->nls conversion won't make the final nls string bigger |
513 | * than the utf one, but if the string is pure ascii they'll have the | |
514 | * same width and an extra char is needed to save the additional \0 | |
515 | */ | |
516 | int maxlen = in_len + 1; | |
1da177e4 | 517 | |
dac52fc1 | 518 | befs_debug(sb, "---> %s", __func__); |
1da177e4 LT |
519 | |
520 | if (!nls) { | |
dac52fc1 | 521 | befs_error(sb, "%s called with no NLS table loaded", __func__); |
1da177e4 LT |
522 | return -EINVAL; |
523 | } | |
524 | ||
525 | *out = result = kmalloc(maxlen, GFP_NOFS); | |
62b80719 | 526 | if (!*out) |
1da177e4 | 527 | return -ENOMEM; |
1da177e4 LT |
528 | |
529 | for (i = o = 0; i < in_len; i += utflen, o += unilen) { | |
530 | ||
531 | /* convert from UTF-8 to Unicode */ | |
74675a58 AS |
532 | utflen = utf8_to_utf32(&in[i], in_len - i, &uni); |
533 | if (utflen < 0) | |
1da177e4 | 534 | goto conv_err; |
1da177e4 LT |
535 | |
536 | /* convert from Unicode to nls */ | |
74675a58 AS |
537 | if (uni > MAX_WCHAR_T) |
538 | goto conv_err; | |
1da177e4 | 539 | unilen = nls->uni2char(uni, &result[o], in_len - o); |
74675a58 | 540 | if (unilen < 0) |
1da177e4 | 541 | goto conv_err; |
1da177e4 LT |
542 | } |
543 | result[o] = '\0'; | |
544 | *out_len = o; | |
545 | ||
dac52fc1 | 546 | befs_debug(sb, "<--- %s", __func__); |
1da177e4 LT |
547 | |
548 | return o; | |
549 | ||
62b80719 | 550 | conv_err: |
1da177e4 LT |
551 | befs_error(sb, "Name using character set %s contains a character that " |
552 | "cannot be converted to unicode.", nls->charset); | |
dac52fc1 | 553 | befs_debug(sb, "<--- %s", __func__); |
1da177e4 LT |
554 | kfree(result); |
555 | return -EILSEQ; | |
556 | } | |
557 | ||
558 | /** | |
559 | * befs_nls2utf - Convert NLS string to utf8 encodeing | |
560 | * @sb: Superblock | |
817e1d90 FF |
561 | * @in: Input string buffer in NLS format |
562 | * @in_len: Length of input string in bytes | |
563 | * @out: The output string in UTF-8 format | |
564 | * @out_len: Length of the output buffer | |
e60f749b | 565 | * |
817e1d90 | 566 | * Converts input string @in, which is in the format of the loaded NLS map, |
1da177e4 | 567 | * into a utf8 string. |
e60f749b | 568 | * |
817e1d90 | 569 | * The destination string @out is allocated by this function and the caller is |
1da177e4 | 570 | * responsible for freeing it with kfree() |
e60f749b | 571 | * |
817e1d90 | 572 | * On return, *@out_len is the length of @out in bytes. |
1da177e4 LT |
573 | * |
574 | * On success, the return value is the number of utf8 characters written to | |
817e1d90 | 575 | * the output buffer @out. |
e60f749b | 576 | * |
1da177e4 LT |
577 | * On Failure, a negative number coresponding to the error code is returned. |
578 | */ | |
579 | ||
580 | static int | |
581 | befs_nls2utf(struct super_block *sb, const char *in, | |
582 | int in_len, char **out, int *out_len) | |
583 | { | |
584 | struct nls_table *nls = BEFS_SB(sb)->nls; | |
585 | int i, o; | |
586 | wchar_t uni; | |
587 | int unilen, utflen; | |
588 | char *result; | |
1ca7087e LB |
589 | /* |
590 | * There are nls characters that will translate to 3-chars-wide UTF-8 | |
591 | * characters, an additional byte is needed to save the final \0 | |
62b80719 LB |
592 | * in special cases |
593 | */ | |
94f563c4 | 594 | int maxlen = (3 * in_len) + 1; |
1da177e4 | 595 | |
dac52fc1 | 596 | befs_debug(sb, "---> %s\n", __func__); |
1da177e4 LT |
597 | |
598 | if (!nls) { | |
dac52fc1 FF |
599 | befs_error(sb, "%s called with no NLS table loaded.", |
600 | __func__); | |
1da177e4 LT |
601 | return -EINVAL; |
602 | } | |
603 | ||
604 | *out = result = kmalloc(maxlen, GFP_NOFS); | |
605 | if (!*out) { | |
1da177e4 LT |
606 | *out_len = 0; |
607 | return -ENOMEM; | |
608 | } | |
609 | ||
610 | for (i = o = 0; i < in_len; i += unilen, o += utflen) { | |
611 | ||
612 | /* convert from nls to unicode */ | |
613 | unilen = nls->char2uni(&in[i], in_len - i, &uni); | |
74675a58 | 614 | if (unilen < 0) |
1da177e4 | 615 | goto conv_err; |
1da177e4 LT |
616 | |
617 | /* convert from unicode to UTF-8 */ | |
74675a58 AS |
618 | utflen = utf32_to_utf8(uni, &result[o], 3); |
619 | if (utflen <= 0) | |
1da177e4 | 620 | goto conv_err; |
1da177e4 LT |
621 | } |
622 | ||
623 | result[o] = '\0'; | |
624 | *out_len = o; | |
625 | ||
dac52fc1 | 626 | befs_debug(sb, "<--- %s", __func__); |
1da177e4 LT |
627 | |
628 | return i; | |
629 | ||
62b80719 | 630 | conv_err: |
1ca7087e | 631 | befs_error(sb, "Name using character set %s contains a character that " |
1da177e4 | 632 | "cannot be converted to unicode.", nls->charset); |
dac52fc1 | 633 | befs_debug(sb, "<--- %s", __func__); |
1da177e4 LT |
634 | kfree(result); |
635 | return -EILSEQ; | |
636 | } | |
637 | ||
ac632f5b LB |
638 | static struct inode *befs_nfs_get_inode(struct super_block *sb, uint64_t ino, |
639 | uint32_t generation) | |
640 | { | |
641 | /* No need to handle i_generation */ | |
642 | return befs_iget(sb, ino); | |
643 | } | |
644 | ||
645 | /* | |
646 | * Map a NFS file handle to a corresponding dentry | |
647 | */ | |
648 | static struct dentry *befs_fh_to_dentry(struct super_block *sb, | |
649 | struct fid *fid, int fh_len, int fh_type) | |
650 | { | |
651 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
652 | befs_nfs_get_inode); | |
653 | } | |
654 | ||
655 | /* | |
656 | * Find the parent for a file specified by NFS handle | |
657 | */ | |
658 | static struct dentry *befs_fh_to_parent(struct super_block *sb, | |
659 | struct fid *fid, int fh_len, int fh_type) | |
660 | { | |
661 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
662 | befs_nfs_get_inode); | |
663 | } | |
664 | ||
dcfd9b21 FF |
665 | static struct dentry *befs_get_parent(struct dentry *child) |
666 | { | |
667 | struct inode *parent; | |
668 | struct befs_inode_info *befs_ino = BEFS_I(d_inode(child)); | |
669 | ||
670 | parent = befs_iget(child->d_sb, | |
671 | (unsigned long)befs_ino->i_parent.start); | |
672 | if (IS_ERR(parent)) | |
673 | return ERR_CAST(parent); | |
674 | ||
675 | return d_obtain_alias(parent); | |
676 | } | |
677 | ||
1da177e4 LT |
678 | enum { |
679 | Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err, | |
680 | }; | |
681 | ||
a447c093 | 682 | static const match_table_t befs_tokens = { |
1da177e4 LT |
683 | {Opt_uid, "uid=%d"}, |
684 | {Opt_gid, "gid=%d"}, | |
685 | {Opt_charset, "iocharset=%s"}, | |
686 | {Opt_debug, "debug"}, | |
687 | {Opt_err, NULL} | |
688 | }; | |
689 | ||
690 | static int | |
09ad0eae | 691 | parse_options(char *options, struct befs_mount_options *opts) |
1da177e4 LT |
692 | { |
693 | char *p; | |
694 | substring_t args[MAX_OPT_ARGS]; | |
695 | int option; | |
31aba059 EB |
696 | kuid_t uid; |
697 | kgid_t gid; | |
1da177e4 LT |
698 | |
699 | /* Initialize options */ | |
31aba059 EB |
700 | opts->uid = GLOBAL_ROOT_UID; |
701 | opts->gid = GLOBAL_ROOT_GID; | |
1da177e4 LT |
702 | opts->use_uid = 0; |
703 | opts->use_gid = 0; | |
704 | opts->iocharset = NULL; | |
705 | opts->debug = 0; | |
706 | ||
707 | if (!options) | |
708 | return 1; | |
709 | ||
710 | while ((p = strsep(&options, ",")) != NULL) { | |
711 | int token; | |
62b80719 | 712 | |
1da177e4 LT |
713 | if (!*p) |
714 | continue; | |
715 | ||
716 | token = match_token(p, befs_tokens, args); | |
717 | switch (token) { | |
718 | case Opt_uid: | |
719 | if (match_int(&args[0], &option)) | |
720 | return 0; | |
31aba059 EB |
721 | uid = INVALID_UID; |
722 | if (option >= 0) | |
723 | uid = make_kuid(current_user_ns(), option); | |
724 | if (!uid_valid(uid)) { | |
dac52fc1 FF |
725 | pr_err("Invalid uid %d, " |
726 | "using default\n", option); | |
1da177e4 LT |
727 | break; |
728 | } | |
31aba059 | 729 | opts->uid = uid; |
1da177e4 LT |
730 | opts->use_uid = 1; |
731 | break; | |
732 | case Opt_gid: | |
733 | if (match_int(&args[0], &option)) | |
734 | return 0; | |
31aba059 EB |
735 | gid = INVALID_GID; |
736 | if (option >= 0) | |
737 | gid = make_kgid(current_user_ns(), option); | |
738 | if (!gid_valid(gid)) { | |
dac52fc1 FF |
739 | pr_err("Invalid gid %d, " |
740 | "using default\n", option); | |
1da177e4 LT |
741 | break; |
742 | } | |
31aba059 | 743 | opts->gid = gid; |
1da177e4 LT |
744 | opts->use_gid = 1; |
745 | break; | |
746 | case Opt_charset: | |
747 | kfree(opts->iocharset); | |
748 | opts->iocharset = match_strdup(&args[0]); | |
749 | if (!opts->iocharset) { | |
dac52fc1 FF |
750 | pr_err("allocation failure for " |
751 | "iocharset string\n"); | |
1da177e4 LT |
752 | return 0; |
753 | } | |
754 | break; | |
755 | case Opt_debug: | |
756 | opts->debug = 1; | |
757 | break; | |
758 | default: | |
dac52fc1 FF |
759 | pr_err("Unrecognized mount option \"%s\" " |
760 | "or missing value\n", p); | |
1da177e4 LT |
761 | return 0; |
762 | } | |
763 | } | |
764 | return 1; | |
765 | } | |
766 | ||
3ab7947a DH |
767 | static int befs_show_options(struct seq_file *m, struct dentry *root) |
768 | { | |
769 | struct befs_sb_info *befs_sb = BEFS_SB(root->d_sb); | |
770 | struct befs_mount_options *opts = &befs_sb->mount_opts; | |
771 | ||
772 | if (!uid_eq(opts->uid, GLOBAL_ROOT_UID)) | |
773 | seq_printf(m, ",uid=%u", | |
774 | from_kuid_munged(&init_user_ns, opts->uid)); | |
775 | if (!gid_eq(opts->gid, GLOBAL_ROOT_GID)) | |
776 | seq_printf(m, ",gid=%u", | |
777 | from_kgid_munged(&init_user_ns, opts->gid)); | |
778 | if (opts->iocharset) | |
779 | seq_printf(m, ",charset=%s", opts->iocharset); | |
780 | if (opts->debug) | |
781 | seq_puts(m, ",debug"); | |
782 | return 0; | |
783 | } | |
784 | ||
1da177e4 | 785 | /* This function has the responsibiltiy of getting the |
e60f749b | 786 | * filesystem ready for unmounting. |
25985edc | 787 | * Basically, we free everything that we allocated in |
1da177e4 LT |
788 | * befs_read_inode |
789 | */ | |
790 | static void | |
791 | befs_put_super(struct super_block *sb) | |
792 | { | |
f99d49ad JJ |
793 | kfree(BEFS_SB(sb)->mount_opts.iocharset); |
794 | BEFS_SB(sb)->mount_opts.iocharset = NULL; | |
6d729e44 | 795 | unload_nls(BEFS_SB(sb)->nls); |
f99d49ad JJ |
796 | kfree(sb->s_fs_info); |
797 | sb->s_fs_info = NULL; | |
1da177e4 LT |
798 | } |
799 | ||
800 | /* Allocate private field of the superblock, fill it. | |
801 | * | |
802 | * Finish filling the public superblock fields | |
803 | * Make the root directory | |
804 | * Load a set of NLS translations if needed. | |
805 | */ | |
806 | static int | |
807 | befs_fill_super(struct super_block *sb, void *data, int silent) | |
808 | { | |
809 | struct buffer_head *bh; | |
038428fc | 810 | struct befs_sb_info *befs_sb; |
1da177e4 LT |
811 | befs_super_block *disk_sb; |
812 | struct inode *root; | |
96eb5419 | 813 | long ret = -EINVAL; |
1da177e4 LT |
814 | const unsigned long sb_block = 0; |
815 | const off_t x86_sb_off = 512; | |
173b066f | 816 | int blocksize; |
1da177e4 | 817 | |
2d4319ef | 818 | sb->s_fs_info = kzalloc(sizeof(*befs_sb), GFP_KERNEL); |
c625426f | 819 | if (sb->s_fs_info == NULL) |
0418726b | 820 | goto unacquire_none; |
c625426f | 821 | |
1da177e4 | 822 | befs_sb = BEFS_SB(sb); |
1da177e4 LT |
823 | |
824 | if (!parse_options((char *) data, &befs_sb->mount_opts)) { | |
dceee2e2 ST |
825 | if (!silent) |
826 | befs_error(sb, "cannot parse mount options"); | |
0418726b | 827 | goto unacquire_priv_sbp; |
1da177e4 LT |
828 | } |
829 | ||
dac52fc1 | 830 | befs_debug(sb, "---> %s", __func__); |
1da177e4 | 831 | |
bc98a42c | 832 | if (!sb_rdonly(sb)) { |
1da177e4 LT |
833 | befs_warning(sb, |
834 | "No write support. Marking filesystem read-only"); | |
1751e8a6 | 835 | sb->s_flags |= SB_RDONLY; |
1da177e4 | 836 | } |
1da177e4 LT |
837 | |
838 | /* | |
839 | * Set dummy blocksize to read super block. | |
840 | * Will be set to real fs blocksize later. | |
841 | * | |
842 | * Linux 2.4.10 and later refuse to read blocks smaller than | |
a441b0d0 | 843 | * the logical block size for the device. But we also need to read at |
1da177e4 | 844 | * least 1k to get the second 512 bytes of the volume. |
e60f749b | 845 | */ |
173b066f LB |
846 | blocksize = sb_min_blocksize(sb, 1024); |
847 | if (!blocksize) { | |
a6499850 LB |
848 | if (!silent) |
849 | befs_error(sb, "unable to set blocksize"); | |
173b066f LB |
850 | goto unacquire_priv_sbp; |
851 | } | |
1da177e4 | 852 | |
62b80719 LB |
853 | bh = sb_bread(sb, sb_block); |
854 | if (!bh) { | |
dceee2e2 ST |
855 | if (!silent) |
856 | befs_error(sb, "unable to read superblock"); | |
0418726b | 857 | goto unacquire_priv_sbp; |
1da177e4 LT |
858 | } |
859 | ||
860 | /* account for offset of super block on x86 */ | |
861 | disk_sb = (befs_super_block *) bh->b_data; | |
152b95a1 HH |
862 | if ((disk_sb->magic1 == BEFS_SUPER_MAGIC1_LE) || |
863 | (disk_sb->magic1 == BEFS_SUPER_MAGIC1_BE)) { | |
1da177e4 LT |
864 | befs_debug(sb, "Using PPC superblock location"); |
865 | } else { | |
866 | befs_debug(sb, "Using x86 superblock location"); | |
867 | disk_sb = | |
868 | (befs_super_block *) ((void *) bh->b_data + x86_sb_off); | |
869 | } | |
870 | ||
8e19189e FF |
871 | if ((befs_load_sb(sb, disk_sb) != BEFS_OK) || |
872 | (befs_check_sb(sb) != BEFS_OK)) | |
0418726b | 873 | goto unacquire_bh; |
1da177e4 LT |
874 | |
875 | befs_dump_super_block(sb, disk_sb); | |
876 | ||
877 | brelse(bh); | |
878 | ||
62b80719 | 879 | if (befs_sb->num_blocks > ~((sector_t)0)) { |
dceee2e2 ST |
880 | if (!silent) |
881 | befs_error(sb, "blocks count: %llu is larger than the host can use", | |
882 | befs_sb->num_blocks); | |
0418726b | 883 | goto unacquire_priv_sbp; |
1da177e4 LT |
884 | } |
885 | ||
886 | /* | |
887 | * set up enough so that it can read an inode | |
888 | * Fill in kernel superblock fields from private sb | |
889 | */ | |
890 | sb->s_magic = BEFS_SUPER_MAGIC; | |
891 | /* Set real blocksize of fs */ | |
892 | sb_set_blocksize(sb, (ulong) befs_sb->block_size); | |
b87221de | 893 | sb->s_op = &befs_sops; |
ac632f5b | 894 | sb->s_export_op = &befs_export_operations; |
96eb5419 DH |
895 | root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir))); |
896 | if (IS_ERR(root)) { | |
897 | ret = PTR_ERR(root); | |
898 | goto unacquire_priv_sbp; | |
899 | } | |
48fde701 | 900 | sb->s_root = d_make_root(root); |
1da177e4 | 901 | if (!sb->s_root) { |
dceee2e2 ST |
902 | if (!silent) |
903 | befs_error(sb, "get root inode failed"); | |
0418726b | 904 | goto unacquire_priv_sbp; |
1da177e4 LT |
905 | } |
906 | ||
907 | /* load nls library */ | |
908 | if (befs_sb->mount_opts.iocharset) { | |
909 | befs_debug(sb, "Loading nls: %s", | |
910 | befs_sb->mount_opts.iocharset); | |
911 | befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset); | |
912 | if (!befs_sb->nls) { | |
913 | befs_warning(sb, "Cannot load nls %s" | |
914 | " loading default nls", | |
915 | befs_sb->mount_opts.iocharset); | |
916 | befs_sb->nls = load_nls_default(); | |
917 | } | |
918 | /* load default nls if none is specified in mount options */ | |
919 | } else { | |
920 | befs_debug(sb, "Loading default nls"); | |
921 | befs_sb->nls = load_nls_default(); | |
922 | } | |
923 | ||
924 | return 0; | |
62b80719 LB |
925 | |
926 | unacquire_bh: | |
1da177e4 LT |
927 | brelse(bh); |
928 | ||
62b80719 | 929 | unacquire_priv_sbp: |
8dd5ca53 | 930 | kfree(befs_sb->mount_opts.iocharset); |
1da177e4 | 931 | kfree(sb->s_fs_info); |
30982583 | 932 | sb->s_fs_info = NULL; |
1da177e4 | 933 | |
62b80719 | 934 | unacquire_none: |
96eb5419 | 935 | return ret; |
1da177e4 LT |
936 | } |
937 | ||
938 | static int | |
939 | befs_remount(struct super_block *sb, int *flags, char *data) | |
940 | { | |
02b9984d | 941 | sync_filesystem(sb); |
1751e8a6 | 942 | if (!(*flags & SB_RDONLY)) |
1da177e4 LT |
943 | return -EINVAL; |
944 | return 0; | |
945 | } | |
946 | ||
947 | static int | |
726c3342 | 948 | befs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 949 | { |
726c3342 | 950 | struct super_block *sb = dentry->d_sb; |
8587246a | 951 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
1da177e4 | 952 | |
dac52fc1 | 953 | befs_debug(sb, "---> %s", __func__); |
1da177e4 LT |
954 | |
955 | buf->f_type = BEFS_SUPER_MAGIC; | |
956 | buf->f_bsize = sb->s_blocksize; | |
957 | buf->f_blocks = BEFS_SB(sb)->num_blocks; | |
958 | buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks; | |
959 | buf->f_bavail = buf->f_bfree; | |
960 | buf->f_files = 0; /* UNKNOWN */ | |
961 | buf->f_ffree = 0; /* UNKNOWN */ | |
8587246a CL |
962 | buf->f_fsid.val[0] = (u32)id; |
963 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
1da177e4 LT |
964 | buf->f_namelen = BEFS_NAME_LEN; |
965 | ||
dac52fc1 | 966 | befs_debug(sb, "<--- %s", __func__); |
1da177e4 LT |
967 | |
968 | return 0; | |
969 | } | |
970 | ||
152a0836 AV |
971 | static struct dentry * |
972 | befs_mount(struct file_system_type *fs_type, int flags, const char *dev_name, | |
973 | void *data) | |
1da177e4 | 974 | { |
152a0836 | 975 | return mount_bdev(fs_type, flags, dev_name, data, befs_fill_super); |
1da177e4 LT |
976 | } |
977 | ||
978 | static struct file_system_type befs_fs_type = { | |
979 | .owner = THIS_MODULE, | |
980 | .name = "befs", | |
152a0836 | 981 | .mount = befs_mount, |
1da177e4 | 982 | .kill_sb = kill_block_super, |
e60f749b | 983 | .fs_flags = FS_REQUIRES_DEV, |
1da177e4 | 984 | }; |
7f78e035 | 985 | MODULE_ALIAS_FS("befs"); |
1da177e4 LT |
986 | |
987 | static int __init | |
988 | init_befs_fs(void) | |
989 | { | |
990 | int err; | |
991 | ||
dac52fc1 | 992 | pr_info("version: %s\n", BEFS_VERSION); |
1da177e4 LT |
993 | |
994 | err = befs_init_inodecache(); | |
995 | if (err) | |
0418726b | 996 | goto unacquire_none; |
1da177e4 LT |
997 | |
998 | err = register_filesystem(&befs_fs_type); | |
999 | if (err) | |
0418726b | 1000 | goto unacquire_inodecache; |
1da177e4 LT |
1001 | |
1002 | return 0; | |
1003 | ||
0418726b | 1004 | unacquire_inodecache: |
1da177e4 LT |
1005 | befs_destroy_inodecache(); |
1006 | ||
0418726b | 1007 | unacquire_none: |
1da177e4 LT |
1008 | return err; |
1009 | } | |
1010 | ||
1011 | static void __exit | |
1012 | exit_befs_fs(void) | |
1013 | { | |
1014 | befs_destroy_inodecache(); | |
1015 | ||
1016 | unregister_filesystem(&befs_fs_type); | |
1017 | } | |
1018 | ||
1019 | /* | |
62b80719 LB |
1020 | * Macros that typecheck the init and exit functions, |
1021 | * ensures that they are called at init and cleanup, | |
1022 | * and eliminates warnings about unused functions. | |
1023 | */ | |
1da177e4 LT |
1024 | module_init(init_befs_fs) |
1025 | module_exit(exit_befs_fs) |