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> | |
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 | ||
f0f49ef5 | 34 | static int befs_readdir(struct file *, struct dir_context *); |
1da177e4 LT |
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 | 68 | .read = generic_read_dir, |
f0f49ef5 | 69 | .iterate = 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 | |
f0f49ef5 | 214 | befs_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 215 | { |
f0f49ef5 | 216 | struct inode *inode = file_inode(file); |
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]; | |
f0f49ef5 | 224 | const char *dirname = file->f_path.dentry->d_name.name; |
1da177e4 LT |
225 | |
226 | befs_debug(sb, "---> befs_readdir() " | |
f0f49ef5 AV |
227 | "name %s, inode %ld, ctx->pos %Ld", |
228 | dirname, inode->i_ino, ctx->pos); | |
1da177e4 | 229 | |
f0f49ef5 AV |
230 | more: |
231 | result = befs_btree_read(sb, ds, ctx->pos, BEFS_NAME_LEN + 1, | |
1da177e4 LT |
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) { | |
f0f49ef5 AV |
253 | char *nlsname; |
254 | int nlsnamelen; | |
1da177e4 LT |
255 | result = |
256 | befs_utf2nls(sb, keybuf, keysize, &nlsname, &nlsnamelen); | |
257 | if (result < 0) { | |
258 | befs_debug(sb, "<--- befs_readdir() ERROR"); | |
259 | return result; | |
260 | } | |
f0f49ef5 AV |
261 | if (!dir_emit(ctx, nlsname, nlsnamelen, |
262 | (ino_t) value, d_type)) { | |
263 | kfree(nlsname); | |
264 | return 0; | |
265 | } | |
1da177e4 | 266 | kfree(nlsname); |
1da177e4 | 267 | } else { |
f0f49ef5 AV |
268 | if (!dir_emit(ctx, keybuf, keysize, |
269 | (ino_t) value, d_type)) | |
270 | return 0; | |
1da177e4 | 271 | } |
f0f49ef5 AV |
272 | ctx->pos++; |
273 | goto more; | |
1da177e4 | 274 | |
f0f49ef5 | 275 | befs_debug(sb, "<--- befs_readdir() pos %Ld", ctx->pos); |
1da177e4 LT |
276 | |
277 | return 0; | |
278 | } | |
279 | ||
280 | static struct inode * | |
281 | befs_alloc_inode(struct super_block *sb) | |
282 | { | |
283 | struct befs_inode_info *bi; | |
284 | bi = (struct befs_inode_info *)kmem_cache_alloc(befs_inode_cachep, | |
e94b1766 | 285 | GFP_KERNEL); |
1da177e4 LT |
286 | if (!bi) |
287 | return NULL; | |
288 | return &bi->vfs_inode; | |
289 | } | |
290 | ||
fa0d7e3d | 291 | static void befs_i_callback(struct rcu_head *head) |
1da177e4 | 292 | { |
fa0d7e3d | 293 | struct inode *inode = container_of(head, struct inode, i_rcu); |
1da177e4 LT |
294 | kmem_cache_free(befs_inode_cachep, BEFS_I(inode)); |
295 | } | |
296 | ||
fa0d7e3d NP |
297 | static void befs_destroy_inode(struct inode *inode) |
298 | { | |
299 | call_rcu(&inode->i_rcu, befs_i_callback); | |
300 | } | |
301 | ||
51cc5068 | 302 | static void init_once(void *foo) |
1da177e4 LT |
303 | { |
304 | struct befs_inode_info *bi = (struct befs_inode_info *) foo; | |
a35afb83 CL |
305 | |
306 | inode_init_once(&bi->vfs_inode); | |
1da177e4 LT |
307 | } |
308 | ||
96eb5419 | 309 | static struct inode *befs_iget(struct super_block *sb, unsigned long ino) |
1da177e4 LT |
310 | { |
311 | struct buffer_head *bh = NULL; | |
312 | befs_inode *raw_inode = NULL; | |
313 | ||
1da177e4 LT |
314 | befs_sb_info *befs_sb = BEFS_SB(sb); |
315 | befs_inode_info *befs_ino = NULL; | |
96eb5419 DH |
316 | struct inode *inode; |
317 | long ret = -EIO; | |
1da177e4 | 318 | |
96eb5419 DH |
319 | befs_debug(sb, "---> befs_read_inode() " "inode = %lu", ino); |
320 | ||
321 | inode = iget_locked(sb, ino); | |
322 | if (IS_ERR(inode)) | |
323 | return inode; | |
324 | if (!(inode->i_state & I_NEW)) | |
325 | return inode; | |
1da177e4 LT |
326 | |
327 | befs_ino = BEFS_I(inode); | |
328 | ||
329 | /* convert from vfs's inode number to befs's inode number */ | |
330 | befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino); | |
331 | ||
332 | befs_debug(sb, " real inode number [%u, %hu, %hu]", | |
333 | befs_ino->i_inode_num.allocation_group, | |
334 | befs_ino->i_inode_num.start, befs_ino->i_inode_num.len); | |
335 | ||
336 | bh = befs_bread(sb, inode->i_ino); | |
337 | if (!bh) { | |
338 | befs_error(sb, "unable to read inode block - " | |
339 | "inode = %lu", inode->i_ino); | |
0418726b | 340 | goto unacquire_none; |
1da177e4 LT |
341 | } |
342 | ||
343 | raw_inode = (befs_inode *) bh->b_data; | |
344 | ||
345 | befs_dump_inode(sb, raw_inode); | |
346 | ||
347 | if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) { | |
348 | befs_error(sb, "Bad inode: %lu", inode->i_ino); | |
0418726b | 349 | goto unacquire_bh; |
1da177e4 LT |
350 | } |
351 | ||
352 | inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode); | |
353 | ||
354 | /* | |
355 | * set uid and gid. But since current BeOS is single user OS, so | |
356 | * you can change by "uid" or "gid" options. | |
357 | */ | |
358 | ||
359 | inode->i_uid = befs_sb->mount_opts.use_uid ? | |
31aba059 EB |
360 | befs_sb->mount_opts.uid : |
361 | make_kuid(&init_user_ns, fs32_to_cpu(sb, raw_inode->uid)); | |
1da177e4 | 362 | inode->i_gid = befs_sb->mount_opts.use_gid ? |
31aba059 EB |
363 | befs_sb->mount_opts.gid : |
364 | make_kgid(&init_user_ns, fs32_to_cpu(sb, raw_inode->gid)); | |
1da177e4 | 365 | |
bfe86848 | 366 | set_nlink(inode, 1); |
1da177e4 LT |
367 | |
368 | /* | |
369 | * BEFS's time is 64 bits, but current VFS is 32 bits... | |
370 | * BEFS don't have access time. Nor inode change time. VFS | |
371 | * doesn't have creation time. | |
372 | * Also, the lower 16 bits of the last_modified_time and | |
373 | * create_time are just a counter to help ensure uniqueness | |
374 | * for indexing purposes. (PFD, page 54) | |
375 | */ | |
376 | ||
377 | inode->i_mtime.tv_sec = | |
378 | fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16; | |
379 | inode->i_mtime.tv_nsec = 0; /* lower 16 bits are not a time */ | |
380 | inode->i_ctime = inode->i_mtime; | |
381 | inode->i_atime = inode->i_mtime; | |
1da177e4 LT |
382 | |
383 | befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num); | |
384 | befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent); | |
385 | befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes); | |
386 | befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags); | |
387 | ||
388 | if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){ | |
389 | inode->i_size = 0; | |
390 | inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE; | |
391 | strncpy(befs_ino->i_data.symlink, raw_inode->data.symlink, | |
7df5fa06 DG |
392 | BEFS_SYMLINK_LEN - 1); |
393 | befs_ino->i_data.symlink[BEFS_SYMLINK_LEN - 1] = '\0'; | |
1da177e4 LT |
394 | } else { |
395 | int num_blks; | |
396 | ||
397 | befs_ino->i_data.ds = | |
e0e3d32b | 398 | fsds_to_cpu(sb, &raw_inode->data.datastream); |
1da177e4 LT |
399 | |
400 | num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds); | |
401 | inode->i_blocks = | |
402 | num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE); | |
403 | inode->i_size = befs_ino->i_data.ds.size; | |
404 | } | |
405 | ||
406 | inode->i_mapping->a_ops = &befs_aops; | |
407 | ||
408 | if (S_ISREG(inode->i_mode)) { | |
2cf06916 | 409 | inode->i_fop = &generic_ro_fops; |
1da177e4 LT |
410 | } else if (S_ISDIR(inode->i_mode)) { |
411 | inode->i_op = &befs_dir_inode_operations; | |
412 | inode->i_fop = &befs_dir_operations; | |
413 | } else if (S_ISLNK(inode->i_mode)) { | |
414 | inode->i_op = &befs_symlink_inode_operations; | |
415 | } else { | |
416 | befs_error(sb, "Inode %lu is not a regular file, " | |
417 | "directory or symlink. THAT IS WRONG! BeFS has no " | |
418 | "on disk special files", inode->i_ino); | |
0418726b | 419 | goto unacquire_bh; |
1da177e4 LT |
420 | } |
421 | ||
422 | brelse(bh); | |
423 | befs_debug(sb, "<--- befs_read_inode()"); | |
96eb5419 DH |
424 | unlock_new_inode(inode); |
425 | return inode; | |
1da177e4 | 426 | |
0418726b | 427 | unacquire_bh: |
1da177e4 LT |
428 | brelse(bh); |
429 | ||
0418726b | 430 | unacquire_none: |
96eb5419 | 431 | iget_failed(inode); |
1da177e4 | 432 | befs_debug(sb, "<--- befs_read_inode() - Bad inode"); |
96eb5419 | 433 | return ERR_PTR(ret); |
1da177e4 LT |
434 | } |
435 | ||
436 | /* Initialize the inode cache. Called at fs setup. | |
20c2df83 | 437 | * |
1da177e4 LT |
438 | * Taken from NFS implementation by Al Viro. |
439 | */ | |
440 | static int | |
441 | befs_init_inodecache(void) | |
442 | { | |
443 | befs_inode_cachep = kmem_cache_create("befs_inode_cache", | |
444 | sizeof (struct befs_inode_info), | |
fffb60f9 PJ |
445 | 0, (SLAB_RECLAIM_ACCOUNT| |
446 | SLAB_MEM_SPREAD), | |
20c2df83 | 447 | init_once); |
1da177e4 LT |
448 | if (befs_inode_cachep == NULL) { |
449 | printk(KERN_ERR "befs_init_inodecache: " | |
421f91d2 | 450 | "Couldn't initialize inode slabcache\n"); |
1da177e4 LT |
451 | return -ENOMEM; |
452 | } | |
453 | ||
454 | return 0; | |
455 | } | |
456 | ||
457 | /* Called at fs teardown. | |
458 | * | |
459 | * Taken from NFS implementation by Al Viro. | |
460 | */ | |
461 | static void | |
462 | befs_destroy_inodecache(void) | |
463 | { | |
8c0a8537 KS |
464 | /* |
465 | * Make sure all delayed rcu free inodes are flushed before we | |
466 | * destroy cache. | |
467 | */ | |
468 | rcu_barrier(); | |
1a1d92c1 | 469 | kmem_cache_destroy(befs_inode_cachep); |
1da177e4 LT |
470 | } |
471 | ||
472 | /* | |
473 | * The inode of symbolic link is different to data stream. | |
474 | * The data stream become link name. Unless the LONG_SYMLINK | |
475 | * flag is set. | |
476 | */ | |
db873896 | 477 | static void * |
1da177e4 LT |
478 | befs_follow_link(struct dentry *dentry, struct nameidata *nd) |
479 | { | |
480 | befs_inode_info *befs_ino = BEFS_I(dentry->d_inode); | |
481 | char *link; | |
482 | ||
483 | if (befs_ino->i_flags & BEFS_LONG_SYMLINK) { | |
484 | struct super_block *sb = dentry->d_sb; | |
485 | befs_data_stream *data = &befs_ino->i_data.ds; | |
486 | befs_off_t len = data->size; | |
487 | ||
338d0f0a TW |
488 | if (len == 0) { |
489 | befs_error(sb, "Long symlink with illegal length"); | |
1da177e4 | 490 | link = ERR_PTR(-EIO); |
7df5fa06 | 491 | } else { |
338d0f0a TW |
492 | befs_debug(sb, "Follow long symlink"); |
493 | ||
494 | link = kmalloc(len, GFP_NOFS); | |
495 | if (!link) { | |
496 | link = ERR_PTR(-ENOMEM); | |
497 | } else if (befs_read_lsymlink(sb, data, link, len) != len) { | |
498 | kfree(link); | |
499 | befs_error(sb, "Failed to read entire long symlink"); | |
500 | link = ERR_PTR(-EIO); | |
501 | } else { | |
502 | link[len - 1] = '\0'; | |
503 | } | |
1da177e4 LT |
504 | } |
505 | } else { | |
506 | link = befs_ino->i_data.symlink; | |
507 | } | |
508 | ||
509 | nd_set_link(nd, link); | |
008b150a | 510 | return NULL; |
1da177e4 LT |
511 | } |
512 | ||
008b150a | 513 | static void befs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) |
1da177e4 LT |
514 | { |
515 | befs_inode_info *befs_ino = BEFS_I(dentry->d_inode); | |
516 | if (befs_ino->i_flags & BEFS_LONG_SYMLINK) { | |
63e3453e HH |
517 | char *link = nd_get_link(nd); |
518 | if (!IS_ERR(link)) | |
519 | kfree(link); | |
1da177e4 LT |
520 | } |
521 | } | |
522 | ||
523 | /* | |
524 | * UTF-8 to NLS charset convert routine | |
525 | * | |
526 | * | |
527 | * Changed 8/10/01 by Will Dyson. Now use uni2char() / char2uni() rather than | |
528 | * the nls tables directly | |
529 | */ | |
530 | ||
531 | static int | |
532 | befs_utf2nls(struct super_block *sb, const char *in, | |
533 | int in_len, char **out, int *out_len) | |
534 | { | |
535 | struct nls_table *nls = BEFS_SB(sb)->nls; | |
536 | int i, o; | |
74675a58 | 537 | unicode_t uni; |
1da177e4 LT |
538 | int unilen, utflen; |
539 | char *result; | |
94f563c4 DC |
540 | /* The utf8->nls conversion won't make the final nls string bigger |
541 | * than the utf one, but if the string is pure ascii they'll have the | |
542 | * same width and an extra char is needed to save the additional \0 | |
543 | */ | |
544 | int maxlen = in_len + 1; | |
1da177e4 LT |
545 | |
546 | befs_debug(sb, "---> utf2nls()"); | |
547 | ||
548 | if (!nls) { | |
549 | befs_error(sb, "befs_utf2nls called with no NLS table loaded"); | |
550 | return -EINVAL; | |
551 | } | |
552 | ||
553 | *out = result = kmalloc(maxlen, GFP_NOFS); | |
554 | if (!*out) { | |
555 | befs_error(sb, "befs_utf2nls() cannot allocate memory"); | |
556 | *out_len = 0; | |
557 | return -ENOMEM; | |
558 | } | |
559 | ||
560 | for (i = o = 0; i < in_len; i += utflen, o += unilen) { | |
561 | ||
562 | /* convert from UTF-8 to Unicode */ | |
74675a58 AS |
563 | utflen = utf8_to_utf32(&in[i], in_len - i, &uni); |
564 | if (utflen < 0) | |
1da177e4 | 565 | goto conv_err; |
1da177e4 LT |
566 | |
567 | /* convert from Unicode to nls */ | |
74675a58 AS |
568 | if (uni > MAX_WCHAR_T) |
569 | goto conv_err; | |
1da177e4 | 570 | unilen = nls->uni2char(uni, &result[o], in_len - o); |
74675a58 | 571 | if (unilen < 0) |
1da177e4 | 572 | goto conv_err; |
1da177e4 LT |
573 | } |
574 | result[o] = '\0'; | |
575 | *out_len = o; | |
576 | ||
577 | befs_debug(sb, "<--- utf2nls()"); | |
578 | ||
579 | return o; | |
580 | ||
581 | conv_err: | |
582 | befs_error(sb, "Name using character set %s contains a character that " | |
583 | "cannot be converted to unicode.", nls->charset); | |
584 | befs_debug(sb, "<--- utf2nls()"); | |
585 | kfree(result); | |
586 | return -EILSEQ; | |
587 | } | |
588 | ||
589 | /** | |
590 | * befs_nls2utf - Convert NLS string to utf8 encodeing | |
591 | * @sb: Superblock | |
592 | * @src: Input string buffer in NLS format | |
593 | * @srclen: Length of input string in bytes | |
4de151d8 | 594 | * @dest: The output string in UTF-8 format |
1da177e4 LT |
595 | * @destlen: Length of the output buffer |
596 | * | |
597 | * Converts input string @src, which is in the format of the loaded NLS map, | |
598 | * into a utf8 string. | |
599 | * | |
600 | * The destination string @dest is allocated by this function and the caller is | |
601 | * responsible for freeing it with kfree() | |
602 | * | |
603 | * On return, *@destlen is the length of @dest in bytes. | |
604 | * | |
605 | * On success, the return value is the number of utf8 characters written to | |
606 | * the output buffer @dest. | |
607 | * | |
608 | * On Failure, a negative number coresponding to the error code is returned. | |
609 | */ | |
610 | ||
611 | static int | |
612 | befs_nls2utf(struct super_block *sb, const char *in, | |
613 | int in_len, char **out, int *out_len) | |
614 | { | |
615 | struct nls_table *nls = BEFS_SB(sb)->nls; | |
616 | int i, o; | |
617 | wchar_t uni; | |
618 | int unilen, utflen; | |
619 | char *result; | |
94f563c4 DC |
620 | /* There're nls characters that will translate to 3-chars-wide UTF-8 |
621 | * characters, a additional byte is needed to save the final \0 | |
622 | * in special cases */ | |
623 | int maxlen = (3 * in_len) + 1; | |
1da177e4 LT |
624 | |
625 | befs_debug(sb, "---> nls2utf()\n"); | |
626 | ||
627 | if (!nls) { | |
628 | befs_error(sb, "befs_nls2utf called with no NLS table loaded."); | |
629 | return -EINVAL; | |
630 | } | |
631 | ||
632 | *out = result = kmalloc(maxlen, GFP_NOFS); | |
633 | if (!*out) { | |
634 | befs_error(sb, "befs_nls2utf() cannot allocate memory"); | |
635 | *out_len = 0; | |
636 | return -ENOMEM; | |
637 | } | |
638 | ||
639 | for (i = o = 0; i < in_len; i += unilen, o += utflen) { | |
640 | ||
641 | /* convert from nls to unicode */ | |
642 | unilen = nls->char2uni(&in[i], in_len - i, &uni); | |
74675a58 | 643 | if (unilen < 0) |
1da177e4 | 644 | goto conv_err; |
1da177e4 LT |
645 | |
646 | /* convert from unicode to UTF-8 */ | |
74675a58 AS |
647 | utflen = utf32_to_utf8(uni, &result[o], 3); |
648 | if (utflen <= 0) | |
1da177e4 | 649 | goto conv_err; |
1da177e4 LT |
650 | } |
651 | ||
652 | result[o] = '\0'; | |
653 | *out_len = o; | |
654 | ||
655 | befs_debug(sb, "<--- nls2utf()"); | |
656 | ||
657 | return i; | |
658 | ||
659 | conv_err: | |
660 | befs_error(sb, "Name using charecter set %s contains a charecter that " | |
661 | "cannot be converted to unicode.", nls->charset); | |
662 | befs_debug(sb, "<--- nls2utf()"); | |
663 | kfree(result); | |
664 | return -EILSEQ; | |
665 | } | |
666 | ||
667 | /** | |
668 | * Use the | |
669 | * | |
670 | */ | |
671 | enum { | |
672 | Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err, | |
673 | }; | |
674 | ||
a447c093 | 675 | static const match_table_t befs_tokens = { |
1da177e4 LT |
676 | {Opt_uid, "uid=%d"}, |
677 | {Opt_gid, "gid=%d"}, | |
678 | {Opt_charset, "iocharset=%s"}, | |
679 | {Opt_debug, "debug"}, | |
680 | {Opt_err, NULL} | |
681 | }; | |
682 | ||
683 | static int | |
684 | parse_options(char *options, befs_mount_options * opts) | |
685 | { | |
686 | char *p; | |
687 | substring_t args[MAX_OPT_ARGS]; | |
688 | int option; | |
31aba059 EB |
689 | kuid_t uid; |
690 | kgid_t gid; | |
1da177e4 LT |
691 | |
692 | /* Initialize options */ | |
31aba059 EB |
693 | opts->uid = GLOBAL_ROOT_UID; |
694 | opts->gid = GLOBAL_ROOT_GID; | |
1da177e4 LT |
695 | opts->use_uid = 0; |
696 | opts->use_gid = 0; | |
697 | opts->iocharset = NULL; | |
698 | opts->debug = 0; | |
699 | ||
700 | if (!options) | |
701 | return 1; | |
702 | ||
703 | while ((p = strsep(&options, ",")) != NULL) { | |
704 | int token; | |
705 | if (!*p) | |
706 | continue; | |
707 | ||
708 | token = match_token(p, befs_tokens, args); | |
709 | switch (token) { | |
710 | case Opt_uid: | |
711 | if (match_int(&args[0], &option)) | |
712 | return 0; | |
31aba059 EB |
713 | uid = INVALID_UID; |
714 | if (option >= 0) | |
715 | uid = make_kuid(current_user_ns(), option); | |
716 | if (!uid_valid(uid)) { | |
1da177e4 LT |
717 | printk(KERN_ERR "BeFS: Invalid uid %d, " |
718 | "using default\n", option); | |
719 | break; | |
720 | } | |
31aba059 | 721 | opts->uid = uid; |
1da177e4 LT |
722 | opts->use_uid = 1; |
723 | break; | |
724 | case Opt_gid: | |
725 | if (match_int(&args[0], &option)) | |
726 | return 0; | |
31aba059 EB |
727 | gid = INVALID_GID; |
728 | if (option >= 0) | |
729 | gid = make_kgid(current_user_ns(), option); | |
730 | if (!gid_valid(gid)) { | |
1da177e4 LT |
731 | printk(KERN_ERR "BeFS: Invalid gid %d, " |
732 | "using default\n", option); | |
733 | break; | |
734 | } | |
31aba059 | 735 | opts->gid = gid; |
1da177e4 LT |
736 | opts->use_gid = 1; |
737 | break; | |
738 | case Opt_charset: | |
739 | kfree(opts->iocharset); | |
740 | opts->iocharset = match_strdup(&args[0]); | |
741 | if (!opts->iocharset) { | |
742 | printk(KERN_ERR "BeFS: allocation failure for " | |
743 | "iocharset string\n"); | |
744 | return 0; | |
745 | } | |
746 | break; | |
747 | case Opt_debug: | |
748 | opts->debug = 1; | |
749 | break; | |
750 | default: | |
751 | printk(KERN_ERR "BeFS: Unrecognized mount option \"%s\" " | |
752 | "or missing value\n", p); | |
753 | return 0; | |
754 | } | |
755 | } | |
756 | return 1; | |
757 | } | |
758 | ||
759 | /* This function has the responsibiltiy of getting the | |
760 | * filesystem ready for unmounting. | |
25985edc | 761 | * Basically, we free everything that we allocated in |
1da177e4 LT |
762 | * befs_read_inode |
763 | */ | |
764 | static void | |
765 | befs_put_super(struct super_block *sb) | |
766 | { | |
f99d49ad JJ |
767 | kfree(BEFS_SB(sb)->mount_opts.iocharset); |
768 | BEFS_SB(sb)->mount_opts.iocharset = NULL; | |
6d729e44 | 769 | unload_nls(BEFS_SB(sb)->nls); |
f99d49ad JJ |
770 | kfree(sb->s_fs_info); |
771 | sb->s_fs_info = NULL; | |
1da177e4 LT |
772 | } |
773 | ||
774 | /* Allocate private field of the superblock, fill it. | |
775 | * | |
776 | * Finish filling the public superblock fields | |
777 | * Make the root directory | |
778 | * Load a set of NLS translations if needed. | |
779 | */ | |
780 | static int | |
781 | befs_fill_super(struct super_block *sb, void *data, int silent) | |
782 | { | |
783 | struct buffer_head *bh; | |
784 | befs_sb_info *befs_sb; | |
785 | befs_super_block *disk_sb; | |
786 | struct inode *root; | |
96eb5419 | 787 | long ret = -EINVAL; |
1da177e4 LT |
788 | const unsigned long sb_block = 0; |
789 | const off_t x86_sb_off = 512; | |
790 | ||
552c3c6c MS |
791 | save_mount_options(sb, data); |
792 | ||
1da177e4 LT |
793 | sb->s_fs_info = kmalloc(sizeof (*befs_sb), GFP_KERNEL); |
794 | if (sb->s_fs_info == NULL) { | |
795 | printk(KERN_ERR | |
796 | "BeFS(%s): Unable to allocate memory for private " | |
797 | "portion of superblock. Bailing.\n", sb->s_id); | |
0418726b | 798 | goto unacquire_none; |
1da177e4 LT |
799 | } |
800 | befs_sb = BEFS_SB(sb); | |
801 | memset(befs_sb, 0, sizeof(befs_sb_info)); | |
802 | ||
803 | if (!parse_options((char *) data, &befs_sb->mount_opts)) { | |
804 | befs_error(sb, "cannot parse mount options"); | |
0418726b | 805 | goto unacquire_priv_sbp; |
1da177e4 LT |
806 | } |
807 | ||
808 | befs_debug(sb, "---> befs_fill_super()"); | |
809 | ||
810 | #ifndef CONFIG_BEFS_RW | |
811 | if (!(sb->s_flags & MS_RDONLY)) { | |
812 | befs_warning(sb, | |
813 | "No write support. Marking filesystem read-only"); | |
814 | sb->s_flags |= MS_RDONLY; | |
815 | } | |
816 | #endif /* CONFIG_BEFS_RW */ | |
817 | ||
818 | /* | |
819 | * Set dummy blocksize to read super block. | |
820 | * Will be set to real fs blocksize later. | |
821 | * | |
822 | * Linux 2.4.10 and later refuse to read blocks smaller than | |
823 | * the hardsect size for the device. But we also need to read at | |
824 | * least 1k to get the second 512 bytes of the volume. | |
825 | * -WD 10-26-01 | |
826 | */ | |
827 | sb_min_blocksize(sb, 1024); | |
828 | ||
829 | if (!(bh = sb_bread(sb, sb_block))) { | |
830 | befs_error(sb, "unable to read superblock"); | |
0418726b | 831 | goto unacquire_priv_sbp; |
1da177e4 LT |
832 | } |
833 | ||
834 | /* account for offset of super block on x86 */ | |
835 | disk_sb = (befs_super_block *) bh->b_data; | |
152b95a1 HH |
836 | if ((disk_sb->magic1 == BEFS_SUPER_MAGIC1_LE) || |
837 | (disk_sb->magic1 == BEFS_SUPER_MAGIC1_BE)) { | |
1da177e4 LT |
838 | befs_debug(sb, "Using PPC superblock location"); |
839 | } else { | |
840 | befs_debug(sb, "Using x86 superblock location"); | |
841 | disk_sb = | |
842 | (befs_super_block *) ((void *) bh->b_data + x86_sb_off); | |
843 | } | |
844 | ||
845 | if (befs_load_sb(sb, disk_sb) != BEFS_OK) | |
0418726b | 846 | goto unacquire_bh; |
1da177e4 LT |
847 | |
848 | befs_dump_super_block(sb, disk_sb); | |
849 | ||
850 | brelse(bh); | |
851 | ||
852 | if (befs_check_sb(sb) != BEFS_OK) | |
0418726b | 853 | goto unacquire_priv_sbp; |
1da177e4 LT |
854 | |
855 | if( befs_sb->num_blocks > ~((sector_t)0) ) { | |
856 | befs_error(sb, "blocks count: %Lu " | |
857 | "is larger than the host can use", | |
858 | befs_sb->num_blocks); | |
0418726b | 859 | goto unacquire_priv_sbp; |
1da177e4 LT |
860 | } |
861 | ||
862 | /* | |
863 | * set up enough so that it can read an inode | |
864 | * Fill in kernel superblock fields from private sb | |
865 | */ | |
866 | sb->s_magic = BEFS_SUPER_MAGIC; | |
867 | /* Set real blocksize of fs */ | |
868 | sb_set_blocksize(sb, (ulong) befs_sb->block_size); | |
b87221de | 869 | sb->s_op = &befs_sops; |
96eb5419 DH |
870 | root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir))); |
871 | if (IS_ERR(root)) { | |
872 | ret = PTR_ERR(root); | |
873 | goto unacquire_priv_sbp; | |
874 | } | |
48fde701 | 875 | sb->s_root = d_make_root(root); |
1da177e4 | 876 | if (!sb->s_root) { |
1da177e4 | 877 | befs_error(sb, "get root inode failed"); |
0418726b | 878 | goto unacquire_priv_sbp; |
1da177e4 LT |
879 | } |
880 | ||
881 | /* load nls library */ | |
882 | if (befs_sb->mount_opts.iocharset) { | |
883 | befs_debug(sb, "Loading nls: %s", | |
884 | befs_sb->mount_opts.iocharset); | |
885 | befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset); | |
886 | if (!befs_sb->nls) { | |
887 | befs_warning(sb, "Cannot load nls %s" | |
888 | " loading default nls", | |
889 | befs_sb->mount_opts.iocharset); | |
890 | befs_sb->nls = load_nls_default(); | |
891 | } | |
892 | /* load default nls if none is specified in mount options */ | |
893 | } else { | |
894 | befs_debug(sb, "Loading default nls"); | |
895 | befs_sb->nls = load_nls_default(); | |
896 | } | |
897 | ||
898 | return 0; | |
899 | /*****************/ | |
0418726b | 900 | unacquire_bh: |
1da177e4 LT |
901 | brelse(bh); |
902 | ||
0418726b | 903 | unacquire_priv_sbp: |
8dd5ca53 | 904 | kfree(befs_sb->mount_opts.iocharset); |
1da177e4 LT |
905 | kfree(sb->s_fs_info); |
906 | ||
0418726b | 907 | unacquire_none: |
1da177e4 | 908 | sb->s_fs_info = NULL; |
96eb5419 | 909 | return ret; |
1da177e4 LT |
910 | } |
911 | ||
912 | static int | |
913 | befs_remount(struct super_block *sb, int *flags, char *data) | |
914 | { | |
915 | if (!(*flags & MS_RDONLY)) | |
916 | return -EINVAL; | |
917 | return 0; | |
918 | } | |
919 | ||
920 | static int | |
726c3342 | 921 | befs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 922 | { |
726c3342 | 923 | struct super_block *sb = dentry->d_sb; |
8587246a | 924 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
1da177e4 LT |
925 | |
926 | befs_debug(sb, "---> befs_statfs()"); | |
927 | ||
928 | buf->f_type = BEFS_SUPER_MAGIC; | |
929 | buf->f_bsize = sb->s_blocksize; | |
930 | buf->f_blocks = BEFS_SB(sb)->num_blocks; | |
931 | buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks; | |
932 | buf->f_bavail = buf->f_bfree; | |
933 | buf->f_files = 0; /* UNKNOWN */ | |
934 | buf->f_ffree = 0; /* UNKNOWN */ | |
8587246a CL |
935 | buf->f_fsid.val[0] = (u32)id; |
936 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
1da177e4 LT |
937 | buf->f_namelen = BEFS_NAME_LEN; |
938 | ||
939 | befs_debug(sb, "<--- befs_statfs()"); | |
940 | ||
941 | return 0; | |
942 | } | |
943 | ||
152a0836 AV |
944 | static struct dentry * |
945 | befs_mount(struct file_system_type *fs_type, int flags, const char *dev_name, | |
946 | void *data) | |
1da177e4 | 947 | { |
152a0836 | 948 | return mount_bdev(fs_type, flags, dev_name, data, befs_fill_super); |
1da177e4 LT |
949 | } |
950 | ||
951 | static struct file_system_type befs_fs_type = { | |
952 | .owner = THIS_MODULE, | |
953 | .name = "befs", | |
152a0836 | 954 | .mount = befs_mount, |
1da177e4 LT |
955 | .kill_sb = kill_block_super, |
956 | .fs_flags = FS_REQUIRES_DEV, | |
957 | }; | |
7f78e035 | 958 | MODULE_ALIAS_FS("befs"); |
1da177e4 LT |
959 | |
960 | static int __init | |
961 | init_befs_fs(void) | |
962 | { | |
963 | int err; | |
964 | ||
965 | printk(KERN_INFO "BeFS version: %s\n", BEFS_VERSION); | |
966 | ||
967 | err = befs_init_inodecache(); | |
968 | if (err) | |
0418726b | 969 | goto unacquire_none; |
1da177e4 LT |
970 | |
971 | err = register_filesystem(&befs_fs_type); | |
972 | if (err) | |
0418726b | 973 | goto unacquire_inodecache; |
1da177e4 LT |
974 | |
975 | return 0; | |
976 | ||
0418726b | 977 | unacquire_inodecache: |
1da177e4 LT |
978 | befs_destroy_inodecache(); |
979 | ||
0418726b | 980 | unacquire_none: |
1da177e4 LT |
981 | return err; |
982 | } | |
983 | ||
984 | static void __exit | |
985 | exit_befs_fs(void) | |
986 | { | |
987 | befs_destroy_inodecache(); | |
988 | ||
989 | unregister_filesystem(&befs_fs_type); | |
990 | } | |
991 | ||
992 | /* | |
993 | Macros that typecheck the init and exit functions, | |
994 | ensures that they are called at init and cleanup, | |
995 | and eliminates warnings about unused functions. | |
996 | */ | |
997 | module_init(init_befs_fs) | |
998 | module_exit(exit_befs_fs) |