Commit | Line | Data |
---|---|---|
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> | |
18 | ||
19 | #include "befs.h" | |
20 | #include "btree.h" | |
21 | #include "inode.h" | |
22 | #include "datastream.h" | |
23 | #include "super.h" | |
24 | #include "io.h" | |
1da177e4 LT |
25 | |
26 | MODULE_DESCRIPTION("BeOS File System (BeFS) driver"); | |
27 | MODULE_AUTHOR("Will Dyson"); | |
28 | MODULE_LICENSE("GPL"); | |
29 | ||
30 | /* The units the vfs expects inode->i_blocks to be in */ | |
31 | #define VFS_BLOCK_SIZE 512 | |
32 | ||
33 | static int befs_readdir(struct file *, void *, filldir_t); | |
34 | static int befs_get_block(struct inode *, sector_t, struct buffer_head *, int); | |
35 | static int befs_readpage(struct file *file, struct page *page); | |
36 | static sector_t befs_bmap(struct address_space *mapping, sector_t block); | |
37 | static struct dentry *befs_lookup(struct inode *, struct dentry *, struct nameidata *); | |
96eb5419 | 38 | static struct inode *befs_iget(struct super_block *, unsigned long); |
1da177e4 LT |
39 | static struct inode *befs_alloc_inode(struct super_block *sb); |
40 | static void befs_destroy_inode(struct inode *inode); | |
41 | static int befs_init_inodecache(void); | |
42 | static void befs_destroy_inodecache(void); | |
008b150a AV |
43 | static void *befs_follow_link(struct dentry *, struct nameidata *); |
44 | static void befs_put_link(struct dentry *, struct nameidata *, void *); | |
1da177e4 LT |
45 | static int befs_utf2nls(struct super_block *sb, const char *in, int in_len, |
46 | char **out, int *out_len); | |
47 | static int befs_nls2utf(struct super_block *sb, const char *in, int in_len, | |
48 | char **out, int *out_len); | |
49 | static void befs_put_super(struct super_block *); | |
50 | static int befs_remount(struct super_block *, int *, char *); | |
726c3342 | 51 | static int befs_statfs(struct dentry *, struct kstatfs *); |
1da177e4 LT |
52 | static int parse_options(char *, befs_mount_options *); |
53 | ||
54 | static const struct super_operations befs_sops = { | |
1da177e4 LT |
55 | .alloc_inode = befs_alloc_inode, /* allocate a new inode */ |
56 | .destroy_inode = befs_destroy_inode, /* deallocate an inode */ | |
57 | .put_super = befs_put_super, /* uninit super */ | |
58 | .statfs = befs_statfs, /* statfs */ | |
59 | .remount_fs = befs_remount, | |
552c3c6c | 60 | .show_options = generic_show_options, |
1da177e4 LT |
61 | }; |
62 | ||
63 | /* slab cache for befs_inode_info objects */ | |
e18b890b | 64 | static struct kmem_cache *befs_inode_cachep; |
1da177e4 | 65 | |
4b6f5d20 | 66 | static const struct file_operations befs_dir_operations = { |
1da177e4 LT |
67 | .read = generic_read_dir, |
68 | .readdir = befs_readdir, | |
59af1584 | 69 | .llseek = generic_file_llseek, |
1da177e4 LT |
70 | }; |
71 | ||
754661f1 | 72 | static const struct inode_operations befs_dir_inode_operations = { |
1da177e4 LT |
73 | .lookup = befs_lookup, |
74 | }; | |
75 | ||
f5e54d6e | 76 | static const struct address_space_operations befs_aops = { |
1da177e4 LT |
77 | .readpage = befs_readpage, |
78 | .sync_page = block_sync_page, | |
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 * | |
163 | befs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) | |
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 | { | |
28f375fd | 216 | struct inode *inode = filp->f_path.dentry->d_inode; |
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 | ||
287 | static void | |
288 | befs_destroy_inode(struct inode *inode) | |
289 | { | |
290 | kmem_cache_free(befs_inode_cachep, BEFS_I(inode)); | |
291 | } | |
292 | ||
51cc5068 | 293 | static void init_once(void *foo) |
1da177e4 LT |
294 | { |
295 | struct befs_inode_info *bi = (struct befs_inode_info *) foo; | |
a35afb83 CL |
296 | |
297 | inode_init_once(&bi->vfs_inode); | |
1da177e4 LT |
298 | } |
299 | ||
96eb5419 | 300 | static struct inode *befs_iget(struct super_block *sb, unsigned long ino) |
1da177e4 LT |
301 | { |
302 | struct buffer_head *bh = NULL; | |
303 | befs_inode *raw_inode = NULL; | |
304 | ||
1da177e4 LT |
305 | befs_sb_info *befs_sb = BEFS_SB(sb); |
306 | befs_inode_info *befs_ino = NULL; | |
96eb5419 DH |
307 | struct inode *inode; |
308 | long ret = -EIO; | |
1da177e4 | 309 | |
96eb5419 DH |
310 | befs_debug(sb, "---> befs_read_inode() " "inode = %lu", ino); |
311 | ||
312 | inode = iget_locked(sb, ino); | |
313 | if (IS_ERR(inode)) | |
314 | return inode; | |
315 | if (!(inode->i_state & I_NEW)) | |
316 | return inode; | |
1da177e4 LT |
317 | |
318 | befs_ino = BEFS_I(inode); | |
319 | ||
320 | /* convert from vfs's inode number to befs's inode number */ | |
321 | befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino); | |
322 | ||
323 | befs_debug(sb, " real inode number [%u, %hu, %hu]", | |
324 | befs_ino->i_inode_num.allocation_group, | |
325 | befs_ino->i_inode_num.start, befs_ino->i_inode_num.len); | |
326 | ||
327 | bh = befs_bread(sb, inode->i_ino); | |
328 | if (!bh) { | |
329 | befs_error(sb, "unable to read inode block - " | |
330 | "inode = %lu", inode->i_ino); | |
0418726b | 331 | goto unacquire_none; |
1da177e4 LT |
332 | } |
333 | ||
334 | raw_inode = (befs_inode *) bh->b_data; | |
335 | ||
336 | befs_dump_inode(sb, raw_inode); | |
337 | ||
338 | if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) { | |
339 | befs_error(sb, "Bad inode: %lu", inode->i_ino); | |
0418726b | 340 | goto unacquire_bh; |
1da177e4 LT |
341 | } |
342 | ||
343 | inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode); | |
344 | ||
345 | /* | |
346 | * set uid and gid. But since current BeOS is single user OS, so | |
347 | * you can change by "uid" or "gid" options. | |
348 | */ | |
349 | ||
350 | inode->i_uid = befs_sb->mount_opts.use_uid ? | |
351 | befs_sb->mount_opts.uid : (uid_t) fs32_to_cpu(sb, raw_inode->uid); | |
352 | inode->i_gid = befs_sb->mount_opts.use_gid ? | |
353 | befs_sb->mount_opts.gid : (gid_t) fs32_to_cpu(sb, raw_inode->gid); | |
354 | ||
355 | inode->i_nlink = 1; | |
356 | ||
357 | /* | |
358 | * BEFS's time is 64 bits, but current VFS is 32 bits... | |
359 | * BEFS don't have access time. Nor inode change time. VFS | |
360 | * doesn't have creation time. | |
361 | * Also, the lower 16 bits of the last_modified_time and | |
362 | * create_time are just a counter to help ensure uniqueness | |
363 | * for indexing purposes. (PFD, page 54) | |
364 | */ | |
365 | ||
366 | inode->i_mtime.tv_sec = | |
367 | fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16; | |
368 | inode->i_mtime.tv_nsec = 0; /* lower 16 bits are not a time */ | |
369 | inode->i_ctime = inode->i_mtime; | |
370 | inode->i_atime = inode->i_mtime; | |
1da177e4 LT |
371 | |
372 | befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num); | |
373 | befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent); | |
374 | befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes); | |
375 | befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags); | |
376 | ||
377 | if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){ | |
378 | inode->i_size = 0; | |
379 | inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE; | |
380 | strncpy(befs_ino->i_data.symlink, raw_inode->data.symlink, | |
7df5fa06 DG |
381 | BEFS_SYMLINK_LEN - 1); |
382 | befs_ino->i_data.symlink[BEFS_SYMLINK_LEN - 1] = '\0'; | |
1da177e4 LT |
383 | } else { |
384 | int num_blks; | |
385 | ||
386 | befs_ino->i_data.ds = | |
387 | fsds_to_cpu(sb, raw_inode->data.datastream); | |
388 | ||
389 | num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds); | |
390 | inode->i_blocks = | |
391 | num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE); | |
392 | inode->i_size = befs_ino->i_data.ds.size; | |
393 | } | |
394 | ||
395 | inode->i_mapping->a_ops = &befs_aops; | |
396 | ||
397 | if (S_ISREG(inode->i_mode)) { | |
2cf06916 | 398 | inode->i_fop = &generic_ro_fops; |
1da177e4 LT |
399 | } else if (S_ISDIR(inode->i_mode)) { |
400 | inode->i_op = &befs_dir_inode_operations; | |
401 | inode->i_fop = &befs_dir_operations; | |
402 | } else if (S_ISLNK(inode->i_mode)) { | |
403 | inode->i_op = &befs_symlink_inode_operations; | |
404 | } else { | |
405 | befs_error(sb, "Inode %lu is not a regular file, " | |
406 | "directory or symlink. THAT IS WRONG! BeFS has no " | |
407 | "on disk special files", inode->i_ino); | |
0418726b | 408 | goto unacquire_bh; |
1da177e4 LT |
409 | } |
410 | ||
411 | brelse(bh); | |
412 | befs_debug(sb, "<--- befs_read_inode()"); | |
96eb5419 DH |
413 | unlock_new_inode(inode); |
414 | return inode; | |
1da177e4 | 415 | |
0418726b | 416 | unacquire_bh: |
1da177e4 LT |
417 | brelse(bh); |
418 | ||
0418726b | 419 | unacquire_none: |
96eb5419 | 420 | iget_failed(inode); |
1da177e4 | 421 | befs_debug(sb, "<--- befs_read_inode() - Bad inode"); |
96eb5419 | 422 | return ERR_PTR(ret); |
1da177e4 LT |
423 | } |
424 | ||
425 | /* Initialize the inode cache. Called at fs setup. | |
20c2df83 | 426 | * |
1da177e4 LT |
427 | * Taken from NFS implementation by Al Viro. |
428 | */ | |
429 | static int | |
430 | befs_init_inodecache(void) | |
431 | { | |
432 | befs_inode_cachep = kmem_cache_create("befs_inode_cache", | |
433 | sizeof (struct befs_inode_info), | |
fffb60f9 PJ |
434 | 0, (SLAB_RECLAIM_ACCOUNT| |
435 | SLAB_MEM_SPREAD), | |
20c2df83 | 436 | init_once); |
1da177e4 LT |
437 | if (befs_inode_cachep == NULL) { |
438 | printk(KERN_ERR "befs_init_inodecache: " | |
439 | "Couldn't initalize inode slabcache\n"); | |
440 | return -ENOMEM; | |
441 | } | |
442 | ||
443 | return 0; | |
444 | } | |
445 | ||
446 | /* Called at fs teardown. | |
447 | * | |
448 | * Taken from NFS implementation by Al Viro. | |
449 | */ | |
450 | static void | |
451 | befs_destroy_inodecache(void) | |
452 | { | |
1a1d92c1 | 453 | kmem_cache_destroy(befs_inode_cachep); |
1da177e4 LT |
454 | } |
455 | ||
456 | /* | |
457 | * The inode of symbolic link is different to data stream. | |
458 | * The data stream become link name. Unless the LONG_SYMLINK | |
459 | * flag is set. | |
460 | */ | |
db873896 | 461 | static void * |
1da177e4 LT |
462 | befs_follow_link(struct dentry *dentry, struct nameidata *nd) |
463 | { | |
464 | befs_inode_info *befs_ino = BEFS_I(dentry->d_inode); | |
465 | char *link; | |
466 | ||
467 | if (befs_ino->i_flags & BEFS_LONG_SYMLINK) { | |
468 | struct super_block *sb = dentry->d_sb; | |
469 | befs_data_stream *data = &befs_ino->i_data.ds; | |
470 | befs_off_t len = data->size; | |
471 | ||
472 | befs_debug(sb, "Follow long symlink"); | |
473 | ||
474 | link = kmalloc(len, GFP_NOFS); | |
475 | if (!link) { | |
476 | link = ERR_PTR(-ENOMEM); | |
477 | } else if (befs_read_lsymlink(sb, data, link, len) != len) { | |
478 | kfree(link); | |
479 | befs_error(sb, "Failed to read entire long symlink"); | |
480 | link = ERR_PTR(-EIO); | |
7df5fa06 DG |
481 | } else { |
482 | link[len - 1] = '\0'; | |
1da177e4 LT |
483 | } |
484 | } else { | |
485 | link = befs_ino->i_data.symlink; | |
486 | } | |
487 | ||
488 | nd_set_link(nd, link); | |
008b150a | 489 | return NULL; |
1da177e4 LT |
490 | } |
491 | ||
008b150a | 492 | static void befs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) |
1da177e4 LT |
493 | { |
494 | befs_inode_info *befs_ino = BEFS_I(dentry->d_inode); | |
495 | if (befs_ino->i_flags & BEFS_LONG_SYMLINK) { | |
63e3453e HH |
496 | char *link = nd_get_link(nd); |
497 | if (!IS_ERR(link)) | |
498 | kfree(link); | |
1da177e4 LT |
499 | } |
500 | } | |
501 | ||
502 | /* | |
503 | * UTF-8 to NLS charset convert routine | |
504 | * | |
505 | * | |
506 | * Changed 8/10/01 by Will Dyson. Now use uni2char() / char2uni() rather than | |
507 | * the nls tables directly | |
508 | */ | |
509 | ||
510 | static int | |
511 | befs_utf2nls(struct super_block *sb, const char *in, | |
512 | int in_len, char **out, int *out_len) | |
513 | { | |
514 | struct nls_table *nls = BEFS_SB(sb)->nls; | |
515 | int i, o; | |
516 | wchar_t uni; | |
517 | int unilen, utflen; | |
518 | char *result; | |
94f563c4 DC |
519 | /* The utf8->nls conversion won't make the final nls string bigger |
520 | * than the utf one, but if the string is pure ascii they'll have the | |
521 | * same width and an extra char is needed to save the additional \0 | |
522 | */ | |
523 | int maxlen = in_len + 1; | |
1da177e4 LT |
524 | |
525 | befs_debug(sb, "---> utf2nls()"); | |
526 | ||
527 | if (!nls) { | |
528 | befs_error(sb, "befs_utf2nls called with no NLS table loaded"); | |
529 | return -EINVAL; | |
530 | } | |
531 | ||
532 | *out = result = kmalloc(maxlen, GFP_NOFS); | |
533 | if (!*out) { | |
534 | befs_error(sb, "befs_utf2nls() cannot allocate memory"); | |
535 | *out_len = 0; | |
536 | return -ENOMEM; | |
537 | } | |
538 | ||
539 | for (i = o = 0; i < in_len; i += utflen, o += unilen) { | |
540 | ||
541 | /* convert from UTF-8 to Unicode */ | |
542 | utflen = utf8_mbtowc(&uni, &in[i], in_len - i); | |
543 | if (utflen < 0) { | |
544 | goto conv_err; | |
545 | } | |
546 | ||
547 | /* convert from Unicode to nls */ | |
548 | unilen = nls->uni2char(uni, &result[o], in_len - o); | |
549 | if (unilen < 0) { | |
550 | goto conv_err; | |
551 | } | |
552 | } | |
553 | result[o] = '\0'; | |
554 | *out_len = o; | |
555 | ||
556 | befs_debug(sb, "<--- utf2nls()"); | |
557 | ||
558 | return o; | |
559 | ||
560 | conv_err: | |
561 | befs_error(sb, "Name using character set %s contains a character that " | |
562 | "cannot be converted to unicode.", nls->charset); | |
563 | befs_debug(sb, "<--- utf2nls()"); | |
564 | kfree(result); | |
565 | return -EILSEQ; | |
566 | } | |
567 | ||
568 | /** | |
569 | * befs_nls2utf - Convert NLS string to utf8 encodeing | |
570 | * @sb: Superblock | |
571 | * @src: Input string buffer in NLS format | |
572 | * @srclen: Length of input string in bytes | |
4de151d8 | 573 | * @dest: The output string in UTF-8 format |
1da177e4 LT |
574 | * @destlen: Length of the output buffer |
575 | * | |
576 | * Converts input string @src, which is in the format of the loaded NLS map, | |
577 | * into a utf8 string. | |
578 | * | |
579 | * The destination string @dest is allocated by this function and the caller is | |
580 | * responsible for freeing it with kfree() | |
581 | * | |
582 | * On return, *@destlen is the length of @dest in bytes. | |
583 | * | |
584 | * On success, the return value is the number of utf8 characters written to | |
585 | * the output buffer @dest. | |
586 | * | |
587 | * On Failure, a negative number coresponding to the error code is returned. | |
588 | */ | |
589 | ||
590 | static int | |
591 | befs_nls2utf(struct super_block *sb, const char *in, | |
592 | int in_len, char **out, int *out_len) | |
593 | { | |
594 | struct nls_table *nls = BEFS_SB(sb)->nls; | |
595 | int i, o; | |
596 | wchar_t uni; | |
597 | int unilen, utflen; | |
598 | char *result; | |
94f563c4 DC |
599 | /* There're nls characters that will translate to 3-chars-wide UTF-8 |
600 | * characters, a additional byte is needed to save the final \0 | |
601 | * in special cases */ | |
602 | int maxlen = (3 * in_len) + 1; | |
1da177e4 LT |
603 | |
604 | befs_debug(sb, "---> nls2utf()\n"); | |
605 | ||
606 | if (!nls) { | |
607 | befs_error(sb, "befs_nls2utf called with no NLS table loaded."); | |
608 | return -EINVAL; | |
609 | } | |
610 | ||
611 | *out = result = kmalloc(maxlen, GFP_NOFS); | |
612 | if (!*out) { | |
613 | befs_error(sb, "befs_nls2utf() cannot allocate memory"); | |
614 | *out_len = 0; | |
615 | return -ENOMEM; | |
616 | } | |
617 | ||
618 | for (i = o = 0; i < in_len; i += unilen, o += utflen) { | |
619 | ||
620 | /* convert from nls to unicode */ | |
621 | unilen = nls->char2uni(&in[i], in_len - i, &uni); | |
622 | if (unilen < 0) { | |
623 | goto conv_err; | |
624 | } | |
625 | ||
626 | /* convert from unicode to UTF-8 */ | |
627 | utflen = utf8_wctomb(&result[o], uni, 3); | |
628 | if (utflen <= 0) { | |
629 | goto conv_err; | |
630 | } | |
631 | } | |
632 | ||
633 | result[o] = '\0'; | |
634 | *out_len = o; | |
635 | ||
636 | befs_debug(sb, "<--- nls2utf()"); | |
637 | ||
638 | return i; | |
639 | ||
640 | conv_err: | |
641 | befs_error(sb, "Name using charecter set %s contains a charecter that " | |
642 | "cannot be converted to unicode.", nls->charset); | |
643 | befs_debug(sb, "<--- nls2utf()"); | |
644 | kfree(result); | |
645 | return -EILSEQ; | |
646 | } | |
647 | ||
648 | /** | |
649 | * Use the | |
650 | * | |
651 | */ | |
652 | enum { | |
653 | Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err, | |
654 | }; | |
655 | ||
a447c093 | 656 | static const match_table_t befs_tokens = { |
1da177e4 LT |
657 | {Opt_uid, "uid=%d"}, |
658 | {Opt_gid, "gid=%d"}, | |
659 | {Opt_charset, "iocharset=%s"}, | |
660 | {Opt_debug, "debug"}, | |
661 | {Opt_err, NULL} | |
662 | }; | |
663 | ||
664 | static int | |
665 | parse_options(char *options, befs_mount_options * opts) | |
666 | { | |
667 | char *p; | |
668 | substring_t args[MAX_OPT_ARGS]; | |
669 | int option; | |
670 | ||
671 | /* Initialize options */ | |
672 | opts->uid = 0; | |
673 | opts->gid = 0; | |
674 | opts->use_uid = 0; | |
675 | opts->use_gid = 0; | |
676 | opts->iocharset = NULL; | |
677 | opts->debug = 0; | |
678 | ||
679 | if (!options) | |
680 | return 1; | |
681 | ||
682 | while ((p = strsep(&options, ",")) != NULL) { | |
683 | int token; | |
684 | if (!*p) | |
685 | continue; | |
686 | ||
687 | token = match_token(p, befs_tokens, args); | |
688 | switch (token) { | |
689 | case Opt_uid: | |
690 | if (match_int(&args[0], &option)) | |
691 | return 0; | |
692 | if (option < 0) { | |
693 | printk(KERN_ERR "BeFS: Invalid uid %d, " | |
694 | "using default\n", option); | |
695 | break; | |
696 | } | |
697 | opts->uid = option; | |
698 | opts->use_uid = 1; | |
699 | break; | |
700 | case Opt_gid: | |
701 | if (match_int(&args[0], &option)) | |
702 | return 0; | |
703 | if (option < 0) { | |
704 | printk(KERN_ERR "BeFS: Invalid gid %d, " | |
705 | "using default\n", option); | |
706 | break; | |
707 | } | |
708 | opts->gid = option; | |
709 | opts->use_gid = 1; | |
710 | break; | |
711 | case Opt_charset: | |
712 | kfree(opts->iocharset); | |
713 | opts->iocharset = match_strdup(&args[0]); | |
714 | if (!opts->iocharset) { | |
715 | printk(KERN_ERR "BeFS: allocation failure for " | |
716 | "iocharset string\n"); | |
717 | return 0; | |
718 | } | |
719 | break; | |
720 | case Opt_debug: | |
721 | opts->debug = 1; | |
722 | break; | |
723 | default: | |
724 | printk(KERN_ERR "BeFS: Unrecognized mount option \"%s\" " | |
725 | "or missing value\n", p); | |
726 | return 0; | |
727 | } | |
728 | } | |
729 | return 1; | |
730 | } | |
731 | ||
732 | /* This function has the responsibiltiy of getting the | |
733 | * filesystem ready for unmounting. | |
734 | * Basicly, we free everything that we allocated in | |
735 | * befs_read_inode | |
736 | */ | |
737 | static void | |
738 | befs_put_super(struct super_block *sb) | |
739 | { | |
f99d49ad JJ |
740 | kfree(BEFS_SB(sb)->mount_opts.iocharset); |
741 | BEFS_SB(sb)->mount_opts.iocharset = NULL; | |
1da177e4 LT |
742 | |
743 | if (BEFS_SB(sb)->nls) { | |
744 | unload_nls(BEFS_SB(sb)->nls); | |
745 | BEFS_SB(sb)->nls = NULL; | |
746 | } | |
747 | ||
f99d49ad JJ |
748 | kfree(sb->s_fs_info); |
749 | sb->s_fs_info = NULL; | |
1da177e4 LT |
750 | return; |
751 | } | |
752 | ||
753 | /* Allocate private field of the superblock, fill it. | |
754 | * | |
755 | * Finish filling the public superblock fields | |
756 | * Make the root directory | |
757 | * Load a set of NLS translations if needed. | |
758 | */ | |
759 | static int | |
760 | befs_fill_super(struct super_block *sb, void *data, int silent) | |
761 | { | |
762 | struct buffer_head *bh; | |
763 | befs_sb_info *befs_sb; | |
764 | befs_super_block *disk_sb; | |
765 | struct inode *root; | |
96eb5419 | 766 | long ret = -EINVAL; |
1da177e4 LT |
767 | const unsigned long sb_block = 0; |
768 | const off_t x86_sb_off = 512; | |
769 | ||
552c3c6c MS |
770 | save_mount_options(sb, data); |
771 | ||
1da177e4 LT |
772 | sb->s_fs_info = kmalloc(sizeof (*befs_sb), GFP_KERNEL); |
773 | if (sb->s_fs_info == NULL) { | |
774 | printk(KERN_ERR | |
775 | "BeFS(%s): Unable to allocate memory for private " | |
776 | "portion of superblock. Bailing.\n", sb->s_id); | |
0418726b | 777 | goto unacquire_none; |
1da177e4 LT |
778 | } |
779 | befs_sb = BEFS_SB(sb); | |
780 | memset(befs_sb, 0, sizeof(befs_sb_info)); | |
781 | ||
782 | if (!parse_options((char *) data, &befs_sb->mount_opts)) { | |
783 | befs_error(sb, "cannot parse mount options"); | |
0418726b | 784 | goto unacquire_priv_sbp; |
1da177e4 LT |
785 | } |
786 | ||
787 | befs_debug(sb, "---> befs_fill_super()"); | |
788 | ||
789 | #ifndef CONFIG_BEFS_RW | |
790 | if (!(sb->s_flags & MS_RDONLY)) { | |
791 | befs_warning(sb, | |
792 | "No write support. Marking filesystem read-only"); | |
793 | sb->s_flags |= MS_RDONLY; | |
794 | } | |
795 | #endif /* CONFIG_BEFS_RW */ | |
796 | ||
797 | /* | |
798 | * Set dummy blocksize to read super block. | |
799 | * Will be set to real fs blocksize later. | |
800 | * | |
801 | * Linux 2.4.10 and later refuse to read blocks smaller than | |
802 | * the hardsect size for the device. But we also need to read at | |
803 | * least 1k to get the second 512 bytes of the volume. | |
804 | * -WD 10-26-01 | |
805 | */ | |
806 | sb_min_blocksize(sb, 1024); | |
807 | ||
808 | if (!(bh = sb_bread(sb, sb_block))) { | |
809 | befs_error(sb, "unable to read superblock"); | |
0418726b | 810 | goto unacquire_priv_sbp; |
1da177e4 LT |
811 | } |
812 | ||
813 | /* account for offset of super block on x86 */ | |
814 | disk_sb = (befs_super_block *) bh->b_data; | |
152b95a1 HH |
815 | if ((disk_sb->magic1 == BEFS_SUPER_MAGIC1_LE) || |
816 | (disk_sb->magic1 == BEFS_SUPER_MAGIC1_BE)) { | |
1da177e4 LT |
817 | befs_debug(sb, "Using PPC superblock location"); |
818 | } else { | |
819 | befs_debug(sb, "Using x86 superblock location"); | |
820 | disk_sb = | |
821 | (befs_super_block *) ((void *) bh->b_data + x86_sb_off); | |
822 | } | |
823 | ||
824 | if (befs_load_sb(sb, disk_sb) != BEFS_OK) | |
0418726b | 825 | goto unacquire_bh; |
1da177e4 LT |
826 | |
827 | befs_dump_super_block(sb, disk_sb); | |
828 | ||
829 | brelse(bh); | |
830 | ||
831 | if (befs_check_sb(sb) != BEFS_OK) | |
0418726b | 832 | goto unacquire_priv_sbp; |
1da177e4 LT |
833 | |
834 | if( befs_sb->num_blocks > ~((sector_t)0) ) { | |
835 | befs_error(sb, "blocks count: %Lu " | |
836 | "is larger than the host can use", | |
837 | befs_sb->num_blocks); | |
0418726b | 838 | goto unacquire_priv_sbp; |
1da177e4 LT |
839 | } |
840 | ||
841 | /* | |
842 | * set up enough so that it can read an inode | |
843 | * Fill in kernel superblock fields from private sb | |
844 | */ | |
845 | sb->s_magic = BEFS_SUPER_MAGIC; | |
846 | /* Set real blocksize of fs */ | |
847 | sb_set_blocksize(sb, (ulong) befs_sb->block_size); | |
848 | sb->s_op = (struct super_operations *) &befs_sops; | |
96eb5419 DH |
849 | root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir))); |
850 | if (IS_ERR(root)) { | |
851 | ret = PTR_ERR(root); | |
852 | goto unacquire_priv_sbp; | |
853 | } | |
1da177e4 LT |
854 | sb->s_root = d_alloc_root(root); |
855 | if (!sb->s_root) { | |
856 | iput(root); | |
857 | befs_error(sb, "get root inode failed"); | |
0418726b | 858 | goto unacquire_priv_sbp; |
1da177e4 LT |
859 | } |
860 | ||
861 | /* load nls library */ | |
862 | if (befs_sb->mount_opts.iocharset) { | |
863 | befs_debug(sb, "Loading nls: %s", | |
864 | befs_sb->mount_opts.iocharset); | |
865 | befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset); | |
866 | if (!befs_sb->nls) { | |
867 | befs_warning(sb, "Cannot load nls %s" | |
868 | " loading default nls", | |
869 | befs_sb->mount_opts.iocharset); | |
870 | befs_sb->nls = load_nls_default(); | |
871 | } | |
872 | /* load default nls if none is specified in mount options */ | |
873 | } else { | |
874 | befs_debug(sb, "Loading default nls"); | |
875 | befs_sb->nls = load_nls_default(); | |
876 | } | |
877 | ||
878 | return 0; | |
879 | /*****************/ | |
0418726b | 880 | unacquire_bh: |
1da177e4 LT |
881 | brelse(bh); |
882 | ||
0418726b | 883 | unacquire_priv_sbp: |
1da177e4 LT |
884 | kfree(sb->s_fs_info); |
885 | ||
0418726b | 886 | unacquire_none: |
1da177e4 | 887 | sb->s_fs_info = NULL; |
96eb5419 | 888 | return ret; |
1da177e4 LT |
889 | } |
890 | ||
891 | static int | |
892 | befs_remount(struct super_block *sb, int *flags, char *data) | |
893 | { | |
894 | if (!(*flags & MS_RDONLY)) | |
895 | return -EINVAL; | |
896 | return 0; | |
897 | } | |
898 | ||
899 | static int | |
726c3342 | 900 | befs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 901 | { |
726c3342 | 902 | struct super_block *sb = dentry->d_sb; |
8587246a | 903 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
1da177e4 LT |
904 | |
905 | befs_debug(sb, "---> befs_statfs()"); | |
906 | ||
907 | buf->f_type = BEFS_SUPER_MAGIC; | |
908 | buf->f_bsize = sb->s_blocksize; | |
909 | buf->f_blocks = BEFS_SB(sb)->num_blocks; | |
910 | buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks; | |
911 | buf->f_bavail = buf->f_bfree; | |
912 | buf->f_files = 0; /* UNKNOWN */ | |
913 | buf->f_ffree = 0; /* UNKNOWN */ | |
8587246a CL |
914 | buf->f_fsid.val[0] = (u32)id; |
915 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
1da177e4 LT |
916 | buf->f_namelen = BEFS_NAME_LEN; |
917 | ||
918 | befs_debug(sb, "<--- befs_statfs()"); | |
919 | ||
920 | return 0; | |
921 | } | |
922 | ||
454e2398 | 923 | static int |
1da177e4 | 924 | befs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, |
454e2398 | 925 | void *data, struct vfsmount *mnt) |
1da177e4 | 926 | { |
454e2398 DH |
927 | return get_sb_bdev(fs_type, flags, dev_name, data, befs_fill_super, |
928 | mnt); | |
1da177e4 LT |
929 | } |
930 | ||
931 | static struct file_system_type befs_fs_type = { | |
932 | .owner = THIS_MODULE, | |
933 | .name = "befs", | |
934 | .get_sb = befs_get_sb, | |
935 | .kill_sb = kill_block_super, | |
936 | .fs_flags = FS_REQUIRES_DEV, | |
937 | }; | |
938 | ||
939 | static int __init | |
940 | init_befs_fs(void) | |
941 | { | |
942 | int err; | |
943 | ||
944 | printk(KERN_INFO "BeFS version: %s\n", BEFS_VERSION); | |
945 | ||
946 | err = befs_init_inodecache(); | |
947 | if (err) | |
0418726b | 948 | goto unacquire_none; |
1da177e4 LT |
949 | |
950 | err = register_filesystem(&befs_fs_type); | |
951 | if (err) | |
0418726b | 952 | goto unacquire_inodecache; |
1da177e4 LT |
953 | |
954 | return 0; | |
955 | ||
0418726b | 956 | unacquire_inodecache: |
1da177e4 LT |
957 | befs_destroy_inodecache(); |
958 | ||
0418726b | 959 | unacquire_none: |
1da177e4 LT |
960 | return err; |
961 | } | |
962 | ||
963 | static void __exit | |
964 | exit_befs_fs(void) | |
965 | { | |
966 | befs_destroy_inodecache(); | |
967 | ||
968 | unregister_filesystem(&befs_fs_type); | |
969 | } | |
970 | ||
971 | /* | |
972 | Macros that typecheck the init and exit functions, | |
973 | ensures that they are called at init and cleanup, | |
974 | and eliminates warnings about unused functions. | |
975 | */ | |
976 | module_init(init_befs_fs) | |
977 | module_exit(exit_befs_fs) |