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