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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 | ||
8 | #include <linux/module.h> | |
9 | #include <linux/slab.h> | |
10 | #include <linux/fs.h> | |
11 | #include <linux/errno.h> | |
12 | #include <linux/stat.h> | |
13 | #include <linux/nls.h> | |
14 | #include <linux/buffer_head.h> | |
15 | #include <linux/vfs.h> | |
16 | #include <linux/parser.h> | |
17 | #include <linux/namei.h> | |
31aba059 | 18 | #include <linux/sched.h> |
1da177e4 LT |
19 | |
20 | #include "befs.h" | |
21 | #include "btree.h" | |
22 | #include "inode.h" | |
23 | #include "datastream.h" | |
24 | #include "super.h" | |
25 | #include "io.h" | |
1da177e4 LT |
26 | |
27 | MODULE_DESCRIPTION("BeOS File System (BeFS) driver"); | |
28 | MODULE_AUTHOR("Will Dyson"); | |
29 | MODULE_LICENSE("GPL"); | |
30 | ||
31 | /* The units the vfs expects inode->i_blocks to be in */ | |
32 | #define VFS_BLOCK_SIZE 512 | |
33 | ||
34 | static int befs_readdir(struct file *, void *, filldir_t); | |
35 | static int befs_get_block(struct inode *, sector_t, struct buffer_head *, int); | |
36 | static int befs_readpage(struct file *file, struct page *page); | |
37 | static sector_t befs_bmap(struct address_space *mapping, sector_t block); | |
00cd8dd3 | 38 | static struct dentry *befs_lookup(struct inode *, struct dentry *, unsigned int); |
96eb5419 | 39 | static struct inode *befs_iget(struct super_block *, unsigned long); |
1da177e4 LT |
40 | static struct inode *befs_alloc_inode(struct super_block *sb); |
41 | static void befs_destroy_inode(struct inode *inode); | |
42 | static int befs_init_inodecache(void); | |
43 | static void befs_destroy_inodecache(void); | |
008b150a AV |
44 | static void *befs_follow_link(struct dentry *, struct nameidata *); |
45 | static void befs_put_link(struct dentry *, struct nameidata *, void *); | |
1da177e4 LT |
46 | static int befs_utf2nls(struct super_block *sb, const char *in, int in_len, |
47 | char **out, int *out_len); | |
48 | static int befs_nls2utf(struct super_block *sb, const char *in, int in_len, | |
49 | char **out, int *out_len); | |
50 | static void befs_put_super(struct super_block *); | |
51 | static int befs_remount(struct super_block *, int *, char *); | |
726c3342 | 52 | static int befs_statfs(struct dentry *, struct kstatfs *); |
1da177e4 LT |
53 | static int parse_options(char *, befs_mount_options *); |
54 | ||
55 | static const struct super_operations befs_sops = { | |
1da177e4 LT |
56 | .alloc_inode = befs_alloc_inode, /* allocate a new inode */ |
57 | .destroy_inode = befs_destroy_inode, /* deallocate an inode */ | |
58 | .put_super = befs_put_super, /* uninit super */ | |
59 | .statfs = befs_statfs, /* statfs */ | |
60 | .remount_fs = befs_remount, | |
552c3c6c | 61 | .show_options = generic_show_options, |
1da177e4 LT |
62 | }; |
63 | ||
64 | /* slab cache for befs_inode_info objects */ | |
e18b890b | 65 | static struct kmem_cache *befs_inode_cachep; |
1da177e4 | 66 | |
4b6f5d20 | 67 | static const struct file_operations befs_dir_operations = { |
1da177e4 LT |
68 | .read = generic_read_dir, |
69 | .readdir = befs_readdir, | |
59af1584 | 70 | .llseek = generic_file_llseek, |
1da177e4 LT |
71 | }; |
72 | ||
754661f1 | 73 | static const struct inode_operations befs_dir_inode_operations = { |
1da177e4 LT |
74 | .lookup = befs_lookup, |
75 | }; | |
76 | ||
f5e54d6e | 77 | static const struct address_space_operations befs_aops = { |
1da177e4 | 78 | .readpage = befs_readpage, |
1da177e4 LT |
79 | .bmap = befs_bmap, |
80 | }; | |
81 | ||
754661f1 | 82 | static const struct inode_operations befs_symlink_inode_operations = { |
1da177e4 LT |
83 | .readlink = generic_readlink, |
84 | .follow_link = befs_follow_link, | |
85 | .put_link = befs_put_link, | |
86 | }; | |
87 | ||
88 | /* | |
89 | * Called by generic_file_read() to read a page of data | |
90 | * | |
91 | * In turn, simply calls a generic block read function and | |
92 | * passes it the address of befs_get_block, for mapping file | |
93 | * positions to disk blocks. | |
94 | */ | |
95 | static int | |
96 | befs_readpage(struct file *file, struct page *page) | |
97 | { | |
98 | return block_read_full_page(page, befs_get_block); | |
99 | } | |
100 | ||
101 | static sector_t | |
102 | befs_bmap(struct address_space *mapping, sector_t block) | |
103 | { | |
104 | return generic_block_bmap(mapping, block, befs_get_block); | |
105 | } | |
106 | ||
107 | /* | |
108 | * Generic function to map a file position (block) to a | |
109 | * disk offset (passed back in bh_result). | |
110 | * | |
111 | * Used by many higher level functions. | |
112 | * | |
113 | * Calls befs_fblock2brun() in datastream.c to do the real work. | |
114 | * | |
115 | * -WD 10-26-01 | |
116 | */ | |
117 | ||
118 | static int | |
119 | befs_get_block(struct inode *inode, sector_t block, | |
120 | struct buffer_head *bh_result, int create) | |
121 | { | |
122 | struct super_block *sb = inode->i_sb; | |
123 | befs_data_stream *ds = &BEFS_I(inode)->i_data.ds; | |
124 | befs_block_run run = BAD_IADDR; | |
125 | int res = 0; | |
126 | ulong disk_off; | |
127 | ||
128 | befs_debug(sb, "---> befs_get_block() for inode %lu, block %ld", | |
129 | inode->i_ino, block); | |
130 | ||
131 | if (block < 0) { | |
132 | befs_error(sb, "befs_get_block() was asked for a block " | |
133 | "number less than zero: block %ld in inode %lu", | |
134 | block, inode->i_ino); | |
135 | return -EIO; | |
136 | } | |
137 | ||
138 | if (create) { | |
139 | befs_error(sb, "befs_get_block() was asked to write to " | |
140 | "block %ld in inode %lu", block, inode->i_ino); | |
141 | return -EPERM; | |
142 | } | |
143 | ||
144 | res = befs_fblock2brun(sb, ds, block, &run); | |
145 | if (res != BEFS_OK) { | |
146 | befs_error(sb, | |
147 | "<--- befs_get_block() for inode %lu, block " | |
148 | "%ld ERROR", inode->i_ino, block); | |
149 | return -EFBIG; | |
150 | } | |
151 | ||
152 | disk_off = (ulong) iaddr2blockno(sb, &run); | |
153 | ||
154 | map_bh(bh_result, inode->i_sb, disk_off); | |
155 | ||
156 | befs_debug(sb, "<--- befs_get_block() for inode %lu, block %ld, " | |
157 | "disk address %lu", inode->i_ino, block, disk_off); | |
158 | ||
159 | return 0; | |
160 | } | |
161 | ||
162 | static struct dentry * | |
00cd8dd3 | 163 | befs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) |
1da177e4 LT |
164 | { |
165 | struct inode *inode = NULL; | |
166 | struct super_block *sb = dir->i_sb; | |
167 | befs_data_stream *ds = &BEFS_I(dir)->i_data.ds; | |
168 | befs_off_t offset; | |
169 | int ret; | |
170 | int utfnamelen; | |
171 | char *utfname; | |
172 | const char *name = dentry->d_name.name; | |
173 | ||
174 | befs_debug(sb, "---> befs_lookup() " | |
175 | "name %s inode %ld", dentry->d_name.name, dir->i_ino); | |
176 | ||
177 | /* Convert to UTF-8 */ | |
178 | if (BEFS_SB(sb)->nls) { | |
179 | ret = | |
180 | befs_nls2utf(sb, name, strlen(name), &utfname, &utfnamelen); | |
181 | if (ret < 0) { | |
182 | befs_debug(sb, "<--- befs_lookup() ERROR"); | |
183 | return ERR_PTR(ret); | |
184 | } | |
185 | ret = befs_btree_find(sb, ds, utfname, &offset); | |
186 | kfree(utfname); | |
187 | ||
188 | } else { | |
189 | ret = befs_btree_find(sb, ds, dentry->d_name.name, &offset); | |
190 | } | |
191 | ||
192 | if (ret == BEFS_BT_NOT_FOUND) { | |
193 | befs_debug(sb, "<--- befs_lookup() %s not found", | |
194 | dentry->d_name.name); | |
195 | return ERR_PTR(-ENOENT); | |
196 | ||
197 | } else if (ret != BEFS_OK || offset == 0) { | |
198 | befs_warning(sb, "<--- befs_lookup() Error"); | |
199 | return ERR_PTR(-ENODATA); | |
200 | } | |
201 | ||
96eb5419 DH |
202 | inode = befs_iget(dir->i_sb, (ino_t) offset); |
203 | if (IS_ERR(inode)) | |
204 | return ERR_CAST(inode); | |
1da177e4 LT |
205 | |
206 | d_add(dentry, inode); | |
207 | ||
208 | befs_debug(sb, "<--- befs_lookup()"); | |
209 | ||
210 | return NULL; | |
211 | } | |
212 | ||
213 | static int | |
214 | befs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
215 | { | |
496ad9aa | 216 | struct inode *inode = file_inode(filp); |
1da177e4 LT |
217 | struct super_block *sb = inode->i_sb; |
218 | befs_data_stream *ds = &BEFS_I(inode)->i_data.ds; | |
219 | befs_off_t value; | |
220 | int result; | |
221 | size_t keysize; | |
222 | unsigned char d_type; | |
223 | char keybuf[BEFS_NAME_LEN + 1]; | |
224 | char *nlsname; | |
225 | int nlsnamelen; | |
28f375fd | 226 | const char *dirname = filp->f_path.dentry->d_name.name; |
1da177e4 LT |
227 | |
228 | befs_debug(sb, "---> befs_readdir() " | |
229 | "name %s, inode %ld, filp->f_pos %Ld", | |
230 | dirname, inode->i_ino, filp->f_pos); | |
231 | ||
232 | result = befs_btree_read(sb, ds, filp->f_pos, BEFS_NAME_LEN + 1, | |
233 | keybuf, &keysize, &value); | |
234 | ||
235 | if (result == BEFS_ERR) { | |
236 | befs_debug(sb, "<--- befs_readdir() ERROR"); | |
237 | befs_error(sb, "IO error reading %s (inode %lu)", | |
238 | dirname, inode->i_ino); | |
239 | return -EIO; | |
240 | ||
241 | } else if (result == BEFS_BT_END) { | |
242 | befs_debug(sb, "<--- befs_readdir() END"); | |
243 | return 0; | |
244 | ||
245 | } else if (result == BEFS_BT_EMPTY) { | |
246 | befs_debug(sb, "<--- befs_readdir() Empty directory"); | |
247 | return 0; | |
248 | } | |
249 | ||
250 | d_type = DT_UNKNOWN; | |
251 | ||
252 | /* Convert to NLS */ | |
253 | if (BEFS_SB(sb)->nls) { | |
254 | result = | |
255 | befs_utf2nls(sb, keybuf, keysize, &nlsname, &nlsnamelen); | |
256 | if (result < 0) { | |
257 | befs_debug(sb, "<--- befs_readdir() ERROR"); | |
258 | return result; | |
259 | } | |
260 | result = filldir(dirent, nlsname, nlsnamelen, filp->f_pos, | |
261 | (ino_t) value, d_type); | |
262 | kfree(nlsname); | |
263 | ||
264 | } else { | |
265 | result = filldir(dirent, keybuf, keysize, filp->f_pos, | |
266 | (ino_t) value, d_type); | |
267 | } | |
268 | ||
269 | filp->f_pos++; | |
270 | ||
271 | befs_debug(sb, "<--- befs_readdir() filp->f_pos %Ld", filp->f_pos); | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
276 | static struct inode * | |
277 | befs_alloc_inode(struct super_block *sb) | |
278 | { | |
279 | struct befs_inode_info *bi; | |
280 | bi = (struct befs_inode_info *)kmem_cache_alloc(befs_inode_cachep, | |
e94b1766 | 281 | GFP_KERNEL); |
1da177e4 LT |
282 | if (!bi) |
283 | return NULL; | |
284 | return &bi->vfs_inode; | |
285 | } | |
286 | ||
fa0d7e3d | 287 | static void befs_i_callback(struct rcu_head *head) |
1da177e4 | 288 | { |
fa0d7e3d | 289 | struct inode *inode = container_of(head, struct inode, i_rcu); |
1da177e4 LT |
290 | kmem_cache_free(befs_inode_cachep, BEFS_I(inode)); |
291 | } | |
292 | ||
fa0d7e3d NP |
293 | static void befs_destroy_inode(struct inode *inode) |
294 | { | |
295 | call_rcu(&inode->i_rcu, befs_i_callback); | |
296 | } | |
297 | ||
51cc5068 | 298 | static void init_once(void *foo) |
1da177e4 LT |
299 | { |
300 | struct befs_inode_info *bi = (struct befs_inode_info *) foo; | |
a35afb83 CL |
301 | |
302 | inode_init_once(&bi->vfs_inode); | |
1da177e4 LT |
303 | } |
304 | ||
96eb5419 | 305 | static struct inode *befs_iget(struct super_block *sb, unsigned long ino) |
1da177e4 LT |
306 | { |
307 | struct buffer_head *bh = NULL; | |
308 | befs_inode *raw_inode = NULL; | |
309 | ||
1da177e4 LT |
310 | befs_sb_info *befs_sb = BEFS_SB(sb); |
311 | befs_inode_info *befs_ino = NULL; | |
96eb5419 DH |
312 | struct inode *inode; |
313 | long ret = -EIO; | |
1da177e4 | 314 | |
96eb5419 DH |
315 | befs_debug(sb, "---> befs_read_inode() " "inode = %lu", ino); |
316 | ||
317 | inode = iget_locked(sb, ino); | |
318 | if (IS_ERR(inode)) | |
319 | return inode; | |
320 | if (!(inode->i_state & I_NEW)) | |
321 | return inode; | |
1da177e4 LT |
322 | |
323 | befs_ino = BEFS_I(inode); | |
324 | ||
325 | /* convert from vfs's inode number to befs's inode number */ | |
326 | befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino); | |
327 | ||
328 | befs_debug(sb, " real inode number [%u, %hu, %hu]", | |
329 | befs_ino->i_inode_num.allocation_group, | |
330 | befs_ino->i_inode_num.start, befs_ino->i_inode_num.len); | |
331 | ||
332 | bh = befs_bread(sb, inode->i_ino); | |
333 | if (!bh) { | |
334 | befs_error(sb, "unable to read inode block - " | |
335 | "inode = %lu", inode->i_ino); | |
0418726b | 336 | goto unacquire_none; |
1da177e4 LT |
337 | } |
338 | ||
339 | raw_inode = (befs_inode *) bh->b_data; | |
340 | ||
341 | befs_dump_inode(sb, raw_inode); | |
342 | ||
343 | if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) { | |
344 | befs_error(sb, "Bad inode: %lu", inode->i_ino); | |
0418726b | 345 | goto unacquire_bh; |
1da177e4 LT |
346 | } |
347 | ||
348 | inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode); | |
349 | ||
350 | /* | |
351 | * set uid and gid. But since current BeOS is single user OS, so | |
352 | * you can change by "uid" or "gid" options. | |
353 | */ | |
354 | ||
355 | inode->i_uid = befs_sb->mount_opts.use_uid ? | |
31aba059 EB |
356 | befs_sb->mount_opts.uid : |
357 | make_kuid(&init_user_ns, fs32_to_cpu(sb, raw_inode->uid)); | |
1da177e4 | 358 | inode->i_gid = befs_sb->mount_opts.use_gid ? |
31aba059 EB |
359 | befs_sb->mount_opts.gid : |
360 | make_kgid(&init_user_ns, fs32_to_cpu(sb, raw_inode->gid)); | |
1da177e4 | 361 | |
bfe86848 | 362 | set_nlink(inode, 1); |
1da177e4 LT |
363 | |
364 | /* | |
365 | * BEFS's time is 64 bits, but current VFS is 32 bits... | |
366 | * BEFS don't have access time. Nor inode change time. VFS | |
367 | * doesn't have creation time. | |
368 | * Also, the lower 16 bits of the last_modified_time and | |
369 | * create_time are just a counter to help ensure uniqueness | |
370 | * for indexing purposes. (PFD, page 54) | |
371 | */ | |
372 | ||
373 | inode->i_mtime.tv_sec = | |
374 | fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16; | |
375 | inode->i_mtime.tv_nsec = 0; /* lower 16 bits are not a time */ | |
376 | inode->i_ctime = inode->i_mtime; | |
377 | inode->i_atime = inode->i_mtime; | |
1da177e4 LT |
378 | |
379 | befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num); | |
380 | befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent); | |
381 | befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes); | |
382 | befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags); | |
383 | ||
384 | if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){ | |
385 | inode->i_size = 0; | |
386 | inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE; | |
387 | strncpy(befs_ino->i_data.symlink, raw_inode->data.symlink, | |
7df5fa06 DG |
388 | BEFS_SYMLINK_LEN - 1); |
389 | befs_ino->i_data.symlink[BEFS_SYMLINK_LEN - 1] = '\0'; | |
1da177e4 LT |
390 | } else { |
391 | int num_blks; | |
392 | ||
393 | befs_ino->i_data.ds = | |
e0e3d32b | 394 | fsds_to_cpu(sb, &raw_inode->data.datastream); |
1da177e4 LT |
395 | |
396 | num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds); | |
397 | inode->i_blocks = | |
398 | num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE); | |
399 | inode->i_size = befs_ino->i_data.ds.size; | |
400 | } | |
401 | ||
402 | inode->i_mapping->a_ops = &befs_aops; | |
403 | ||
404 | if (S_ISREG(inode->i_mode)) { | |
2cf06916 | 405 | inode->i_fop = &generic_ro_fops; |
1da177e4 LT |
406 | } else if (S_ISDIR(inode->i_mode)) { |
407 | inode->i_op = &befs_dir_inode_operations; | |
408 | inode->i_fop = &befs_dir_operations; | |
409 | } else if (S_ISLNK(inode->i_mode)) { | |
410 | inode->i_op = &befs_symlink_inode_operations; | |
411 | } else { | |
412 | befs_error(sb, "Inode %lu is not a regular file, " | |
413 | "directory or symlink. THAT IS WRONG! BeFS has no " | |
414 | "on disk special files", inode->i_ino); | |
0418726b | 415 | goto unacquire_bh; |
1da177e4 LT |
416 | } |
417 | ||
418 | brelse(bh); | |
419 | befs_debug(sb, "<--- befs_read_inode()"); | |
96eb5419 DH |
420 | unlock_new_inode(inode); |
421 | return inode; | |
1da177e4 | 422 | |
0418726b | 423 | unacquire_bh: |
1da177e4 LT |
424 | brelse(bh); |
425 | ||
0418726b | 426 | unacquire_none: |
96eb5419 | 427 | iget_failed(inode); |
1da177e4 | 428 | befs_debug(sb, "<--- befs_read_inode() - Bad inode"); |
96eb5419 | 429 | return ERR_PTR(ret); |
1da177e4 LT |
430 | } |
431 | ||
432 | /* Initialize the inode cache. Called at fs setup. | |
20c2df83 | 433 | * |
1da177e4 LT |
434 | * Taken from NFS implementation by Al Viro. |
435 | */ | |
436 | static int | |
437 | befs_init_inodecache(void) | |
438 | { | |
439 | befs_inode_cachep = kmem_cache_create("befs_inode_cache", | |
440 | sizeof (struct befs_inode_info), | |
fffb60f9 PJ |
441 | 0, (SLAB_RECLAIM_ACCOUNT| |
442 | SLAB_MEM_SPREAD), | |
20c2df83 | 443 | init_once); |
1da177e4 LT |
444 | if (befs_inode_cachep == NULL) { |
445 | printk(KERN_ERR "befs_init_inodecache: " | |
421f91d2 | 446 | "Couldn't initialize inode slabcache\n"); |
1da177e4 LT |
447 | return -ENOMEM; |
448 | } | |
449 | ||
450 | return 0; | |
451 | } | |
452 | ||
453 | /* Called at fs teardown. | |
454 | * | |
455 | * Taken from NFS implementation by Al Viro. | |
456 | */ | |
457 | static void | |
458 | befs_destroy_inodecache(void) | |
459 | { | |
8c0a8537 KS |
460 | /* |
461 | * Make sure all delayed rcu free inodes are flushed before we | |
462 | * destroy cache. | |
463 | */ | |
464 | rcu_barrier(); | |
1a1d92c1 | 465 | kmem_cache_destroy(befs_inode_cachep); |
1da177e4 LT |
466 | } |
467 | ||
468 | /* | |
469 | * The inode of symbolic link is different to data stream. | |
470 | * The data stream become link name. Unless the LONG_SYMLINK | |
471 | * flag is set. | |
472 | */ | |
db873896 | 473 | static void * |
1da177e4 LT |
474 | befs_follow_link(struct dentry *dentry, struct nameidata *nd) |
475 | { | |
476 | befs_inode_info *befs_ino = BEFS_I(dentry->d_inode); | |
477 | char *link; | |
478 | ||
479 | if (befs_ino->i_flags & BEFS_LONG_SYMLINK) { | |
480 | struct super_block *sb = dentry->d_sb; | |
481 | befs_data_stream *data = &befs_ino->i_data.ds; | |
482 | befs_off_t len = data->size; | |
483 | ||
338d0f0a TW |
484 | if (len == 0) { |
485 | befs_error(sb, "Long symlink with illegal length"); | |
1da177e4 | 486 | link = ERR_PTR(-EIO); |
7df5fa06 | 487 | } else { |
338d0f0a TW |
488 | befs_debug(sb, "Follow long symlink"); |
489 | ||
490 | link = kmalloc(len, GFP_NOFS); | |
491 | if (!link) { | |
492 | link = ERR_PTR(-ENOMEM); | |
493 | } else if (befs_read_lsymlink(sb, data, link, len) != len) { | |
494 | kfree(link); | |
495 | befs_error(sb, "Failed to read entire long symlink"); | |
496 | link = ERR_PTR(-EIO); | |
497 | } else { | |
498 | link[len - 1] = '\0'; | |
499 | } | |
1da177e4 LT |
500 | } |
501 | } else { | |
502 | link = befs_ino->i_data.symlink; | |
503 | } | |
504 | ||
505 | nd_set_link(nd, link); | |
008b150a | 506 | return NULL; |
1da177e4 LT |
507 | } |
508 | ||
008b150a | 509 | static void befs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) |
1da177e4 LT |
510 | { |
511 | befs_inode_info *befs_ino = BEFS_I(dentry->d_inode); | |
512 | if (befs_ino->i_flags & BEFS_LONG_SYMLINK) { | |
63e3453e HH |
513 | char *link = nd_get_link(nd); |
514 | if (!IS_ERR(link)) | |
515 | kfree(link); | |
1da177e4 LT |
516 | } |
517 | } | |
518 | ||
519 | /* | |
520 | * UTF-8 to NLS charset convert routine | |
521 | * | |
522 | * | |
523 | * Changed 8/10/01 by Will Dyson. Now use uni2char() / char2uni() rather than | |
524 | * the nls tables directly | |
525 | */ | |
526 | ||
527 | static int | |
528 | befs_utf2nls(struct super_block *sb, const char *in, | |
529 | int in_len, char **out, int *out_len) | |
530 | { | |
531 | struct nls_table *nls = BEFS_SB(sb)->nls; | |
532 | int i, o; | |
74675a58 | 533 | unicode_t uni; |
1da177e4 LT |
534 | int unilen, utflen; |
535 | char *result; | |
94f563c4 DC |
536 | /* The utf8->nls conversion won't make the final nls string bigger |
537 | * than the utf one, but if the string is pure ascii they'll have the | |
538 | * same width and an extra char is needed to save the additional \0 | |
539 | */ | |
540 | int maxlen = in_len + 1; | |
1da177e4 LT |
541 | |
542 | befs_debug(sb, "---> utf2nls()"); | |
543 | ||
544 | if (!nls) { | |
545 | befs_error(sb, "befs_utf2nls called with no NLS table loaded"); | |
546 | return -EINVAL; | |
547 | } | |
548 | ||
549 | *out = result = kmalloc(maxlen, GFP_NOFS); | |
550 | if (!*out) { | |
551 | befs_error(sb, "befs_utf2nls() cannot allocate memory"); | |
552 | *out_len = 0; | |
553 | return -ENOMEM; | |
554 | } | |
555 | ||
556 | for (i = o = 0; i < in_len; i += utflen, o += unilen) { | |
557 | ||
558 | /* convert from UTF-8 to Unicode */ | |
74675a58 AS |
559 | utflen = utf8_to_utf32(&in[i], in_len - i, &uni); |
560 | if (utflen < 0) | |
1da177e4 | 561 | goto conv_err; |
1da177e4 LT |
562 | |
563 | /* convert from Unicode to nls */ | |
74675a58 AS |
564 | if (uni > MAX_WCHAR_T) |
565 | goto conv_err; | |
1da177e4 | 566 | unilen = nls->uni2char(uni, &result[o], in_len - o); |
74675a58 | 567 | if (unilen < 0) |
1da177e4 | 568 | goto conv_err; |
1da177e4 LT |
569 | } |
570 | result[o] = '\0'; | |
571 | *out_len = o; | |
572 | ||
573 | befs_debug(sb, "<--- utf2nls()"); | |
574 | ||
575 | return o; | |
576 | ||
577 | conv_err: | |
578 | befs_error(sb, "Name using character set %s contains a character that " | |
579 | "cannot be converted to unicode.", nls->charset); | |
580 | befs_debug(sb, "<--- utf2nls()"); | |
581 | kfree(result); | |
582 | return -EILSEQ; | |
583 | } | |
584 | ||
585 | /** | |
586 | * befs_nls2utf - Convert NLS string to utf8 encodeing | |
587 | * @sb: Superblock | |
588 | * @src: Input string buffer in NLS format | |
589 | * @srclen: Length of input string in bytes | |
4de151d8 | 590 | * @dest: The output string in UTF-8 format |
1da177e4 LT |
591 | * @destlen: Length of the output buffer |
592 | * | |
593 | * Converts input string @src, which is in the format of the loaded NLS map, | |
594 | * into a utf8 string. | |
595 | * | |
596 | * The destination string @dest is allocated by this function and the caller is | |
597 | * responsible for freeing it with kfree() | |
598 | * | |
599 | * On return, *@destlen is the length of @dest in bytes. | |
600 | * | |
601 | * On success, the return value is the number of utf8 characters written to | |
602 | * the output buffer @dest. | |
603 | * | |
604 | * On Failure, a negative number coresponding to the error code is returned. | |
605 | */ | |
606 | ||
607 | static int | |
608 | befs_nls2utf(struct super_block *sb, const char *in, | |
609 | int in_len, char **out, int *out_len) | |
610 | { | |
611 | struct nls_table *nls = BEFS_SB(sb)->nls; | |
612 | int i, o; | |
613 | wchar_t uni; | |
614 | int unilen, utflen; | |
615 | char *result; | |
94f563c4 DC |
616 | /* There're nls characters that will translate to 3-chars-wide UTF-8 |
617 | * characters, a additional byte is needed to save the final \0 | |
618 | * in special cases */ | |
619 | int maxlen = (3 * in_len) + 1; | |
1da177e4 LT |
620 | |
621 | befs_debug(sb, "---> nls2utf()\n"); | |
622 | ||
623 | if (!nls) { | |
624 | befs_error(sb, "befs_nls2utf called with no NLS table loaded."); | |
625 | return -EINVAL; | |
626 | } | |
627 | ||
628 | *out = result = kmalloc(maxlen, GFP_NOFS); | |
629 | if (!*out) { | |
630 | befs_error(sb, "befs_nls2utf() cannot allocate memory"); | |
631 | *out_len = 0; | |
632 | return -ENOMEM; | |
633 | } | |
634 | ||
635 | for (i = o = 0; i < in_len; i += unilen, o += utflen) { | |
636 | ||
637 | /* convert from nls to unicode */ | |
638 | unilen = nls->char2uni(&in[i], in_len - i, &uni); | |
74675a58 | 639 | if (unilen < 0) |
1da177e4 | 640 | goto conv_err; |
1da177e4 LT |
641 | |
642 | /* convert from unicode to UTF-8 */ | |
74675a58 AS |
643 | utflen = utf32_to_utf8(uni, &result[o], 3); |
644 | if (utflen <= 0) | |
1da177e4 | 645 | goto conv_err; |
1da177e4 LT |
646 | } |
647 | ||
648 | result[o] = '\0'; | |
649 | *out_len = o; | |
650 | ||
651 | befs_debug(sb, "<--- nls2utf()"); | |
652 | ||
653 | return i; | |
654 | ||
655 | conv_err: | |
656 | befs_error(sb, "Name using charecter set %s contains a charecter that " | |
657 | "cannot be converted to unicode.", nls->charset); | |
658 | befs_debug(sb, "<--- nls2utf()"); | |
659 | kfree(result); | |
660 | return -EILSEQ; | |
661 | } | |
662 | ||
663 | /** | |
664 | * Use the | |
665 | * | |
666 | */ | |
667 | enum { | |
668 | Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err, | |
669 | }; | |
670 | ||
a447c093 | 671 | static const match_table_t befs_tokens = { |
1da177e4 LT |
672 | {Opt_uid, "uid=%d"}, |
673 | {Opt_gid, "gid=%d"}, | |
674 | {Opt_charset, "iocharset=%s"}, | |
675 | {Opt_debug, "debug"}, | |
676 | {Opt_err, NULL} | |
677 | }; | |
678 | ||
679 | static int | |
680 | parse_options(char *options, befs_mount_options * opts) | |
681 | { | |
682 | char *p; | |
683 | substring_t args[MAX_OPT_ARGS]; | |
684 | int option; | |
31aba059 EB |
685 | kuid_t uid; |
686 | kgid_t gid; | |
1da177e4 LT |
687 | |
688 | /* Initialize options */ | |
31aba059 EB |
689 | opts->uid = GLOBAL_ROOT_UID; |
690 | opts->gid = GLOBAL_ROOT_GID; | |
1da177e4 LT |
691 | opts->use_uid = 0; |
692 | opts->use_gid = 0; | |
693 | opts->iocharset = NULL; | |
694 | opts->debug = 0; | |
695 | ||
696 | if (!options) | |
697 | return 1; | |
698 | ||
699 | while ((p = strsep(&options, ",")) != NULL) { | |
700 | int token; | |
701 | if (!*p) | |
702 | continue; | |
703 | ||
704 | token = match_token(p, befs_tokens, args); | |
705 | switch (token) { | |
706 | case Opt_uid: | |
707 | if (match_int(&args[0], &option)) | |
708 | return 0; | |
31aba059 EB |
709 | uid = INVALID_UID; |
710 | if (option >= 0) | |
711 | uid = make_kuid(current_user_ns(), option); | |
712 | if (!uid_valid(uid)) { | |
1da177e4 LT |
713 | printk(KERN_ERR "BeFS: Invalid uid %d, " |
714 | "using default\n", option); | |
715 | break; | |
716 | } | |
31aba059 | 717 | opts->uid = uid; |
1da177e4 LT |
718 | opts->use_uid = 1; |
719 | break; | |
720 | case Opt_gid: | |
721 | if (match_int(&args[0], &option)) | |
722 | return 0; | |
31aba059 EB |
723 | gid = INVALID_GID; |
724 | if (option >= 0) | |
725 | gid = make_kgid(current_user_ns(), option); | |
726 | if (!gid_valid(gid)) { | |
1da177e4 LT |
727 | printk(KERN_ERR "BeFS: Invalid gid %d, " |
728 | "using default\n", option); | |
729 | break; | |
730 | } | |
31aba059 | 731 | opts->gid = gid; |
1da177e4 LT |
732 | opts->use_gid = 1; |
733 | break; | |
734 | case Opt_charset: | |
735 | kfree(opts->iocharset); | |
736 | opts->iocharset = match_strdup(&args[0]); | |
737 | if (!opts->iocharset) { | |
738 | printk(KERN_ERR "BeFS: allocation failure for " | |
739 | "iocharset string\n"); | |
740 | return 0; | |
741 | } | |
742 | break; | |
743 | case Opt_debug: | |
744 | opts->debug = 1; | |
745 | break; | |
746 | default: | |
747 | printk(KERN_ERR "BeFS: Unrecognized mount option \"%s\" " | |
748 | "or missing value\n", p); | |
749 | return 0; | |
750 | } | |
751 | } | |
752 | return 1; | |
753 | } | |
754 | ||
755 | /* This function has the responsibiltiy of getting the | |
756 | * filesystem ready for unmounting. | |
25985edc | 757 | * Basically, we free everything that we allocated in |
1da177e4 LT |
758 | * befs_read_inode |
759 | */ | |
760 | static void | |
761 | befs_put_super(struct super_block *sb) | |
762 | { | |
f99d49ad JJ |
763 | kfree(BEFS_SB(sb)->mount_opts.iocharset); |
764 | BEFS_SB(sb)->mount_opts.iocharset = NULL; | |
6d729e44 | 765 | unload_nls(BEFS_SB(sb)->nls); |
f99d49ad JJ |
766 | kfree(sb->s_fs_info); |
767 | sb->s_fs_info = NULL; | |
1da177e4 LT |
768 | } |
769 | ||
770 | /* Allocate private field of the superblock, fill it. | |
771 | * | |
772 | * Finish filling the public superblock fields | |
773 | * Make the root directory | |
774 | * Load a set of NLS translations if needed. | |
775 | */ | |
776 | static int | |
777 | befs_fill_super(struct super_block *sb, void *data, int silent) | |
778 | { | |
779 | struct buffer_head *bh; | |
780 | befs_sb_info *befs_sb; | |
781 | befs_super_block *disk_sb; | |
782 | struct inode *root; | |
96eb5419 | 783 | long ret = -EINVAL; |
1da177e4 LT |
784 | const unsigned long sb_block = 0; |
785 | const off_t x86_sb_off = 512; | |
786 | ||
552c3c6c MS |
787 | save_mount_options(sb, data); |
788 | ||
1da177e4 LT |
789 | sb->s_fs_info = kmalloc(sizeof (*befs_sb), GFP_KERNEL); |
790 | if (sb->s_fs_info == NULL) { | |
791 | printk(KERN_ERR | |
792 | "BeFS(%s): Unable to allocate memory for private " | |
793 | "portion of superblock. Bailing.\n", sb->s_id); | |
0418726b | 794 | goto unacquire_none; |
1da177e4 LT |
795 | } |
796 | befs_sb = BEFS_SB(sb); | |
797 | memset(befs_sb, 0, sizeof(befs_sb_info)); | |
798 | ||
799 | if (!parse_options((char *) data, &befs_sb->mount_opts)) { | |
800 | befs_error(sb, "cannot parse mount options"); | |
0418726b | 801 | goto unacquire_priv_sbp; |
1da177e4 LT |
802 | } |
803 | ||
804 | befs_debug(sb, "---> befs_fill_super()"); | |
805 | ||
806 | #ifndef CONFIG_BEFS_RW | |
807 | if (!(sb->s_flags & MS_RDONLY)) { | |
808 | befs_warning(sb, | |
809 | "No write support. Marking filesystem read-only"); | |
810 | sb->s_flags |= MS_RDONLY; | |
811 | } | |
812 | #endif /* CONFIG_BEFS_RW */ | |
813 | ||
814 | /* | |
815 | * Set dummy blocksize to read super block. | |
816 | * Will be set to real fs blocksize later. | |
817 | * | |
818 | * Linux 2.4.10 and later refuse to read blocks smaller than | |
819 | * the hardsect size for the device. But we also need to read at | |
820 | * least 1k to get the second 512 bytes of the volume. | |
821 | * -WD 10-26-01 | |
822 | */ | |
823 | sb_min_blocksize(sb, 1024); | |
824 | ||
825 | if (!(bh = sb_bread(sb, sb_block))) { | |
826 | befs_error(sb, "unable to read superblock"); | |
0418726b | 827 | goto unacquire_priv_sbp; |
1da177e4 LT |
828 | } |
829 | ||
830 | /* account for offset of super block on x86 */ | |
831 | disk_sb = (befs_super_block *) bh->b_data; | |
152b95a1 HH |
832 | if ((disk_sb->magic1 == BEFS_SUPER_MAGIC1_LE) || |
833 | (disk_sb->magic1 == BEFS_SUPER_MAGIC1_BE)) { | |
1da177e4 LT |
834 | befs_debug(sb, "Using PPC superblock location"); |
835 | } else { | |
836 | befs_debug(sb, "Using x86 superblock location"); | |
837 | disk_sb = | |
838 | (befs_super_block *) ((void *) bh->b_data + x86_sb_off); | |
839 | } | |
840 | ||
841 | if (befs_load_sb(sb, disk_sb) != BEFS_OK) | |
0418726b | 842 | goto unacquire_bh; |
1da177e4 LT |
843 | |
844 | befs_dump_super_block(sb, disk_sb); | |
845 | ||
846 | brelse(bh); | |
847 | ||
848 | if (befs_check_sb(sb) != BEFS_OK) | |
0418726b | 849 | goto unacquire_priv_sbp; |
1da177e4 LT |
850 | |
851 | if( befs_sb->num_blocks > ~((sector_t)0) ) { | |
852 | befs_error(sb, "blocks count: %Lu " | |
853 | "is larger than the host can use", | |
854 | befs_sb->num_blocks); | |
0418726b | 855 | goto unacquire_priv_sbp; |
1da177e4 LT |
856 | } |
857 | ||
858 | /* | |
859 | * set up enough so that it can read an inode | |
860 | * Fill in kernel superblock fields from private sb | |
861 | */ | |
862 | sb->s_magic = BEFS_SUPER_MAGIC; | |
863 | /* Set real blocksize of fs */ | |
864 | sb_set_blocksize(sb, (ulong) befs_sb->block_size); | |
b87221de | 865 | sb->s_op = &befs_sops; |
96eb5419 DH |
866 | root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir))); |
867 | if (IS_ERR(root)) { | |
868 | ret = PTR_ERR(root); | |
869 | goto unacquire_priv_sbp; | |
870 | } | |
48fde701 | 871 | sb->s_root = d_make_root(root); |
1da177e4 | 872 | if (!sb->s_root) { |
1da177e4 | 873 | befs_error(sb, "get root inode failed"); |
0418726b | 874 | goto unacquire_priv_sbp; |
1da177e4 LT |
875 | } |
876 | ||
877 | /* load nls library */ | |
878 | if (befs_sb->mount_opts.iocharset) { | |
879 | befs_debug(sb, "Loading nls: %s", | |
880 | befs_sb->mount_opts.iocharset); | |
881 | befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset); | |
882 | if (!befs_sb->nls) { | |
883 | befs_warning(sb, "Cannot load nls %s" | |
884 | " loading default nls", | |
885 | befs_sb->mount_opts.iocharset); | |
886 | befs_sb->nls = load_nls_default(); | |
887 | } | |
888 | /* load default nls if none is specified in mount options */ | |
889 | } else { | |
890 | befs_debug(sb, "Loading default nls"); | |
891 | befs_sb->nls = load_nls_default(); | |
892 | } | |
893 | ||
894 | return 0; | |
895 | /*****************/ | |
0418726b | 896 | unacquire_bh: |
1da177e4 LT |
897 | brelse(bh); |
898 | ||
0418726b | 899 | unacquire_priv_sbp: |
8dd5ca53 | 900 | kfree(befs_sb->mount_opts.iocharset); |
1da177e4 LT |
901 | kfree(sb->s_fs_info); |
902 | ||
0418726b | 903 | unacquire_none: |
1da177e4 | 904 | sb->s_fs_info = NULL; |
96eb5419 | 905 | return ret; |
1da177e4 LT |
906 | } |
907 | ||
908 | static int | |
909 | befs_remount(struct super_block *sb, int *flags, char *data) | |
910 | { | |
911 | if (!(*flags & MS_RDONLY)) | |
912 | return -EINVAL; | |
913 | return 0; | |
914 | } | |
915 | ||
916 | static int | |
726c3342 | 917 | befs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 918 | { |
726c3342 | 919 | struct super_block *sb = dentry->d_sb; |
8587246a | 920 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
1da177e4 LT |
921 | |
922 | befs_debug(sb, "---> befs_statfs()"); | |
923 | ||
924 | buf->f_type = BEFS_SUPER_MAGIC; | |
925 | buf->f_bsize = sb->s_blocksize; | |
926 | buf->f_blocks = BEFS_SB(sb)->num_blocks; | |
927 | buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks; | |
928 | buf->f_bavail = buf->f_bfree; | |
929 | buf->f_files = 0; /* UNKNOWN */ | |
930 | buf->f_ffree = 0; /* UNKNOWN */ | |
8587246a CL |
931 | buf->f_fsid.val[0] = (u32)id; |
932 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
1da177e4 LT |
933 | buf->f_namelen = BEFS_NAME_LEN; |
934 | ||
935 | befs_debug(sb, "<--- befs_statfs()"); | |
936 | ||
937 | return 0; | |
938 | } | |
939 | ||
152a0836 AV |
940 | static struct dentry * |
941 | befs_mount(struct file_system_type *fs_type, int flags, const char *dev_name, | |
942 | void *data) | |
1da177e4 | 943 | { |
152a0836 | 944 | return mount_bdev(fs_type, flags, dev_name, data, befs_fill_super); |
1da177e4 LT |
945 | } |
946 | ||
947 | static struct file_system_type befs_fs_type = { | |
948 | .owner = THIS_MODULE, | |
949 | .name = "befs", | |
152a0836 | 950 | .mount = befs_mount, |
1da177e4 LT |
951 | .kill_sb = kill_block_super, |
952 | .fs_flags = FS_REQUIRES_DEV, | |
953 | }; | |
7f78e035 | 954 | MODULE_ALIAS_FS("befs"); |
1da177e4 LT |
955 | |
956 | static int __init | |
957 | init_befs_fs(void) | |
958 | { | |
959 | int err; | |
960 | ||
961 | printk(KERN_INFO "BeFS version: %s\n", BEFS_VERSION); | |
962 | ||
963 | err = befs_init_inodecache(); | |
964 | if (err) | |
0418726b | 965 | goto unacquire_none; |
1da177e4 LT |
966 | |
967 | err = register_filesystem(&befs_fs_type); | |
968 | if (err) | |
0418726b | 969 | goto unacquire_inodecache; |
1da177e4 LT |
970 | |
971 | return 0; | |
972 | ||
0418726b | 973 | unacquire_inodecache: |
1da177e4 LT |
974 | befs_destroy_inodecache(); |
975 | ||
0418726b | 976 | unacquire_none: |
1da177e4 LT |
977 | return err; |
978 | } | |
979 | ||
980 | static void __exit | |
981 | exit_befs_fs(void) | |
982 | { | |
983 | befs_destroy_inodecache(); | |
984 | ||
985 | unregister_filesystem(&befs_fs_type); | |
986 | } | |
987 | ||
988 | /* | |
989 | Macros that typecheck the init and exit functions, | |
990 | ensures that they are called at init and cleanup, | |
991 | and eliminates warnings about unused functions. | |
992 | */ | |
993 | module_init(init_befs_fs) | |
994 | module_exit(exit_befs_fs) |