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 | ||
dac52fc1 FF |
8 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
9 | ||
1da177e4 LT |
10 | #include <linux/module.h> |
11 | #include <linux/slab.h> | |
12 | #include <linux/fs.h> | |
13 | #include <linux/errno.h> | |
14 | #include <linux/stat.h> | |
15 | #include <linux/nls.h> | |
16 | #include <linux/buffer_head.h> | |
17 | #include <linux/vfs.h> | |
18 | #include <linux/parser.h> | |
19 | #include <linux/namei.h> | |
31aba059 | 20 | #include <linux/sched.h> |
1da177e4 LT |
21 | |
22 | #include "befs.h" | |
23 | #include "btree.h" | |
24 | #include "inode.h" | |
25 | #include "datastream.h" | |
26 | #include "super.h" | |
27 | #include "io.h" | |
1da177e4 LT |
28 | |
29 | MODULE_DESCRIPTION("BeOS File System (BeFS) driver"); | |
30 | MODULE_AUTHOR("Will Dyson"); | |
31 | MODULE_LICENSE("GPL"); | |
32 | ||
33 | /* The units the vfs expects inode->i_blocks to be in */ | |
34 | #define VFS_BLOCK_SIZE 512 | |
35 | ||
f0f49ef5 | 36 | static int befs_readdir(struct file *, struct dir_context *); |
1da177e4 LT |
37 | static int befs_get_block(struct inode *, sector_t, struct buffer_head *, int); |
38 | static int befs_readpage(struct file *file, struct page *page); | |
39 | static sector_t befs_bmap(struct address_space *mapping, sector_t block); | |
00cd8dd3 | 40 | static struct dentry *befs_lookup(struct inode *, struct dentry *, unsigned int); |
96eb5419 | 41 | static struct inode *befs_iget(struct super_block *, unsigned long); |
1da177e4 LT |
42 | static struct inode *befs_alloc_inode(struct super_block *sb); |
43 | static void befs_destroy_inode(struct inode *inode); | |
1da177e4 | 44 | static void befs_destroy_inodecache(void); |
008b150a | 45 | static void *befs_follow_link(struct dentry *, struct nameidata *); |
48bc06e7 | 46 | static void *befs_fast_follow_link(struct dentry *, struct nameidata *); |
1da177e4 LT |
47 | static int befs_utf2nls(struct super_block *sb, const char *in, int in_len, |
48 | char **out, int *out_len); | |
49 | static int befs_nls2utf(struct super_block *sb, const char *in, int in_len, | |
50 | char **out, int *out_len); | |
51 | static void befs_put_super(struct super_block *); | |
52 | static int befs_remount(struct super_block *, int *, char *); | |
726c3342 | 53 | static int befs_statfs(struct dentry *, struct kstatfs *); |
1da177e4 LT |
54 | static int parse_options(char *, befs_mount_options *); |
55 | ||
56 | static const struct super_operations befs_sops = { | |
1da177e4 LT |
57 | .alloc_inode = befs_alloc_inode, /* allocate a new inode */ |
58 | .destroy_inode = befs_destroy_inode, /* deallocate an inode */ | |
59 | .put_super = befs_put_super, /* uninit super */ | |
60 | .statfs = befs_statfs, /* statfs */ | |
61 | .remount_fs = befs_remount, | |
552c3c6c | 62 | .show_options = generic_show_options, |
1da177e4 LT |
63 | }; |
64 | ||
65 | /* slab cache for befs_inode_info objects */ | |
e18b890b | 66 | static struct kmem_cache *befs_inode_cachep; |
1da177e4 | 67 | |
4b6f5d20 | 68 | static const struct file_operations befs_dir_operations = { |
1da177e4 | 69 | .read = generic_read_dir, |
f0f49ef5 | 70 | .iterate = befs_readdir, |
59af1584 | 71 | .llseek = generic_file_llseek, |
1da177e4 LT |
72 | }; |
73 | ||
754661f1 | 74 | static const struct inode_operations befs_dir_inode_operations = { |
1da177e4 LT |
75 | .lookup = befs_lookup, |
76 | }; | |
77 | ||
f5e54d6e | 78 | static const struct address_space_operations befs_aops = { |
1da177e4 | 79 | .readpage = befs_readpage, |
1da177e4 LT |
80 | .bmap = befs_bmap, |
81 | }; | |
82 | ||
48bc06e7 AV |
83 | static const struct inode_operations befs_fast_symlink_inode_operations = { |
84 | .readlink = generic_readlink, | |
85 | .follow_link = befs_fast_follow_link, | |
86 | }; | |
87 | ||
754661f1 | 88 | static const struct inode_operations befs_symlink_inode_operations = { |
1da177e4 LT |
89 | .readlink = generic_readlink, |
90 | .follow_link = befs_follow_link, | |
48bc06e7 | 91 | .put_link = kfree_put_link, |
1da177e4 LT |
92 | }; |
93 | ||
94 | /* | |
95 | * Called by generic_file_read() to read a page of data | |
96 | * | |
97 | * In turn, simply calls a generic block read function and | |
98 | * passes it the address of befs_get_block, for mapping file | |
99 | * positions to disk blocks. | |
100 | */ | |
101 | static int | |
102 | befs_readpage(struct file *file, struct page *page) | |
103 | { | |
104 | return block_read_full_page(page, befs_get_block); | |
105 | } | |
106 | ||
107 | static sector_t | |
108 | befs_bmap(struct address_space *mapping, sector_t block) | |
109 | { | |
110 | return generic_block_bmap(mapping, block, befs_get_block); | |
111 | } | |
112 | ||
113 | /* | |
114 | * Generic function to map a file position (block) to a | |
115 | * disk offset (passed back in bh_result). | |
116 | * | |
117 | * Used by many higher level functions. | |
118 | * | |
119 | * Calls befs_fblock2brun() in datastream.c to do the real work. | |
120 | * | |
121 | * -WD 10-26-01 | |
122 | */ | |
123 | ||
124 | static int | |
125 | befs_get_block(struct inode *inode, sector_t block, | |
126 | struct buffer_head *bh_result, int create) | |
127 | { | |
128 | struct super_block *sb = inode->i_sb; | |
129 | befs_data_stream *ds = &BEFS_I(inode)->i_data.ds; | |
130 | befs_block_run run = BAD_IADDR; | |
131 | int res = 0; | |
132 | ulong disk_off; | |
133 | ||
134 | befs_debug(sb, "---> befs_get_block() for inode %lu, block %ld", | |
dac52fc1 | 135 | (unsigned long)inode->i_ino, (long)block); |
1da177e4 LT |
136 | |
137 | if (block < 0) { | |
138 | befs_error(sb, "befs_get_block() was asked for a block " | |
139 | "number less than zero: block %ld in inode %lu", | |
dac52fc1 | 140 | (long)block, (unsigned long)inode->i_ino); |
1da177e4 LT |
141 | return -EIO; |
142 | } | |
143 | ||
144 | if (create) { | |
145 | befs_error(sb, "befs_get_block() was asked to write to " | |
dac52fc1 FF |
146 | "block %ld in inode %lu", (long)block, |
147 | (unsigned long)inode->i_ino); | |
1da177e4 LT |
148 | return -EPERM; |
149 | } | |
150 | ||
151 | res = befs_fblock2brun(sb, ds, block, &run); | |
152 | if (res != BEFS_OK) { | |
153 | befs_error(sb, | |
dac52fc1 FF |
154 | "<--- %s for inode %lu, block %ld ERROR", |
155 | __func__, (unsigned long)inode->i_ino, | |
156 | (long)block); | |
1da177e4 LT |
157 | return -EFBIG; |
158 | } | |
159 | ||
160 | disk_off = (ulong) iaddr2blockno(sb, &run); | |
161 | ||
162 | map_bh(bh_result, inode->i_sb, disk_off); | |
163 | ||
dac52fc1 FF |
164 | befs_debug(sb, "<--- %s for inode %lu, block %ld, disk address %lu", |
165 | __func__, (unsigned long)inode->i_ino, (long)block, | |
166 | (unsigned long)disk_off); | |
1da177e4 LT |
167 | |
168 | return 0; | |
169 | } | |
170 | ||
171 | static struct dentry * | |
00cd8dd3 | 172 | befs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) |
1da177e4 LT |
173 | { |
174 | struct inode *inode = NULL; | |
175 | struct super_block *sb = dir->i_sb; | |
176 | befs_data_stream *ds = &BEFS_I(dir)->i_data.ds; | |
177 | befs_off_t offset; | |
178 | int ret; | |
179 | int utfnamelen; | |
180 | char *utfname; | |
181 | const char *name = dentry->d_name.name; | |
182 | ||
dac52fc1 FF |
183 | befs_debug(sb, "---> %s name %s inode %ld", __func__, |
184 | dentry->d_name.name, dir->i_ino); | |
1da177e4 LT |
185 | |
186 | /* Convert to UTF-8 */ | |
187 | if (BEFS_SB(sb)->nls) { | |
188 | ret = | |
189 | befs_nls2utf(sb, name, strlen(name), &utfname, &utfnamelen); | |
190 | if (ret < 0) { | |
dac52fc1 | 191 | befs_debug(sb, "<--- %s ERROR", __func__); |
1da177e4 LT |
192 | return ERR_PTR(ret); |
193 | } | |
194 | ret = befs_btree_find(sb, ds, utfname, &offset); | |
195 | kfree(utfname); | |
196 | ||
197 | } else { | |
198 | ret = befs_btree_find(sb, ds, dentry->d_name.name, &offset); | |
199 | } | |
200 | ||
201 | if (ret == BEFS_BT_NOT_FOUND) { | |
dac52fc1 | 202 | befs_debug(sb, "<--- %s %s not found", __func__, |
1da177e4 LT |
203 | dentry->d_name.name); |
204 | return ERR_PTR(-ENOENT); | |
205 | ||
206 | } else if (ret != BEFS_OK || offset == 0) { | |
dac52fc1 | 207 | befs_warning(sb, "<--- %s Error", __func__); |
1da177e4 LT |
208 | return ERR_PTR(-ENODATA); |
209 | } | |
210 | ||
96eb5419 DH |
211 | inode = befs_iget(dir->i_sb, (ino_t) offset); |
212 | if (IS_ERR(inode)) | |
213 | return ERR_CAST(inode); | |
1da177e4 LT |
214 | |
215 | d_add(dentry, inode); | |
216 | ||
dac52fc1 | 217 | befs_debug(sb, "<--- %s", __func__); |
1da177e4 LT |
218 | |
219 | return NULL; | |
220 | } | |
221 | ||
222 | static int | |
f0f49ef5 | 223 | befs_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 224 | { |
f0f49ef5 | 225 | struct inode *inode = file_inode(file); |
1da177e4 LT |
226 | struct super_block *sb = inode->i_sb; |
227 | befs_data_stream *ds = &BEFS_I(inode)->i_data.ds; | |
228 | befs_off_t value; | |
229 | int result; | |
230 | size_t keysize; | |
231 | unsigned char d_type; | |
232 | char keybuf[BEFS_NAME_LEN + 1]; | |
f0f49ef5 | 233 | const char *dirname = file->f_path.dentry->d_name.name; |
1da177e4 | 234 | |
dac52fc1 FF |
235 | befs_debug(sb, "---> %s name %s, inode %ld, ctx->pos %lld", |
236 | __func__, dirname, inode->i_ino, ctx->pos); | |
1da177e4 | 237 | |
f0f49ef5 AV |
238 | more: |
239 | result = befs_btree_read(sb, ds, ctx->pos, BEFS_NAME_LEN + 1, | |
1da177e4 LT |
240 | keybuf, &keysize, &value); |
241 | ||
242 | if (result == BEFS_ERR) { | |
dac52fc1 | 243 | befs_debug(sb, "<--- %s ERROR", __func__); |
1da177e4 LT |
244 | befs_error(sb, "IO error reading %s (inode %lu)", |
245 | dirname, inode->i_ino); | |
246 | return -EIO; | |
247 | ||
248 | } else if (result == BEFS_BT_END) { | |
dac52fc1 | 249 | befs_debug(sb, "<--- %s END", __func__); |
1da177e4 LT |
250 | return 0; |
251 | ||
252 | } else if (result == BEFS_BT_EMPTY) { | |
dac52fc1 | 253 | befs_debug(sb, "<--- %s Empty directory", __func__); |
1da177e4 LT |
254 | return 0; |
255 | } | |
256 | ||
257 | d_type = DT_UNKNOWN; | |
258 | ||
259 | /* Convert to NLS */ | |
260 | if (BEFS_SB(sb)->nls) { | |
f0f49ef5 AV |
261 | char *nlsname; |
262 | int nlsnamelen; | |
1da177e4 LT |
263 | result = |
264 | befs_utf2nls(sb, keybuf, keysize, &nlsname, &nlsnamelen); | |
265 | if (result < 0) { | |
dac52fc1 | 266 | befs_debug(sb, "<--- %s ERROR", __func__); |
1da177e4 LT |
267 | return result; |
268 | } | |
f0f49ef5 AV |
269 | if (!dir_emit(ctx, nlsname, nlsnamelen, |
270 | (ino_t) value, d_type)) { | |
271 | kfree(nlsname); | |
272 | return 0; | |
273 | } | |
1da177e4 | 274 | kfree(nlsname); |
1da177e4 | 275 | } else { |
f0f49ef5 AV |
276 | if (!dir_emit(ctx, keybuf, keysize, |
277 | (ino_t) value, d_type)) | |
278 | return 0; | |
1da177e4 | 279 | } |
f0f49ef5 AV |
280 | ctx->pos++; |
281 | goto more; | |
1da177e4 | 282 | |
dac52fc1 | 283 | befs_debug(sb, "<--- %s pos %lld", __func__, ctx->pos); |
1da177e4 LT |
284 | |
285 | return 0; | |
286 | } | |
287 | ||
288 | static struct inode * | |
289 | befs_alloc_inode(struct super_block *sb) | |
290 | { | |
291 | struct befs_inode_info *bi; | |
292 | bi = (struct befs_inode_info *)kmem_cache_alloc(befs_inode_cachep, | |
e94b1766 | 293 | GFP_KERNEL); |
1da177e4 LT |
294 | if (!bi) |
295 | return NULL; | |
296 | return &bi->vfs_inode; | |
297 | } | |
298 | ||
fa0d7e3d | 299 | static void befs_i_callback(struct rcu_head *head) |
1da177e4 | 300 | { |
fa0d7e3d | 301 | struct inode *inode = container_of(head, struct inode, i_rcu); |
1da177e4 LT |
302 | kmem_cache_free(befs_inode_cachep, BEFS_I(inode)); |
303 | } | |
304 | ||
fa0d7e3d NP |
305 | static void befs_destroy_inode(struct inode *inode) |
306 | { | |
307 | call_rcu(&inode->i_rcu, befs_i_callback); | |
308 | } | |
309 | ||
51cc5068 | 310 | static void init_once(void *foo) |
1da177e4 LT |
311 | { |
312 | struct befs_inode_info *bi = (struct befs_inode_info *) foo; | |
a35afb83 CL |
313 | |
314 | inode_init_once(&bi->vfs_inode); | |
1da177e4 LT |
315 | } |
316 | ||
96eb5419 | 317 | static struct inode *befs_iget(struct super_block *sb, unsigned long ino) |
1da177e4 LT |
318 | { |
319 | struct buffer_head *bh = NULL; | |
320 | befs_inode *raw_inode = NULL; | |
321 | ||
1da177e4 LT |
322 | befs_sb_info *befs_sb = BEFS_SB(sb); |
323 | befs_inode_info *befs_ino = NULL; | |
96eb5419 DH |
324 | struct inode *inode; |
325 | long ret = -EIO; | |
1da177e4 | 326 | |
dac52fc1 | 327 | befs_debug(sb, "---> %s inode = %lu", __func__, ino); |
96eb5419 DH |
328 | |
329 | inode = iget_locked(sb, ino); | |
ac34a1b3 RP |
330 | if (!inode) |
331 | return ERR_PTR(-ENOMEM); | |
96eb5419 DH |
332 | if (!(inode->i_state & I_NEW)) |
333 | return inode; | |
1da177e4 LT |
334 | |
335 | befs_ino = BEFS_I(inode); | |
336 | ||
337 | /* convert from vfs's inode number to befs's inode number */ | |
338 | befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino); | |
339 | ||
340 | befs_debug(sb, " real inode number [%u, %hu, %hu]", | |
341 | befs_ino->i_inode_num.allocation_group, | |
342 | befs_ino->i_inode_num.start, befs_ino->i_inode_num.len); | |
343 | ||
344 | bh = befs_bread(sb, inode->i_ino); | |
345 | if (!bh) { | |
346 | befs_error(sb, "unable to read inode block - " | |
347 | "inode = %lu", inode->i_ino); | |
0418726b | 348 | goto unacquire_none; |
1da177e4 LT |
349 | } |
350 | ||
351 | raw_inode = (befs_inode *) bh->b_data; | |
352 | ||
353 | befs_dump_inode(sb, raw_inode); | |
354 | ||
355 | if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) { | |
356 | befs_error(sb, "Bad inode: %lu", inode->i_ino); | |
0418726b | 357 | goto unacquire_bh; |
1da177e4 LT |
358 | } |
359 | ||
360 | inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode); | |
361 | ||
362 | /* | |
363 | * set uid and gid. But since current BeOS is single user OS, so | |
364 | * you can change by "uid" or "gid" options. | |
365 | */ | |
366 | ||
367 | inode->i_uid = befs_sb->mount_opts.use_uid ? | |
31aba059 EB |
368 | befs_sb->mount_opts.uid : |
369 | make_kuid(&init_user_ns, fs32_to_cpu(sb, raw_inode->uid)); | |
1da177e4 | 370 | inode->i_gid = befs_sb->mount_opts.use_gid ? |
31aba059 EB |
371 | befs_sb->mount_opts.gid : |
372 | make_kgid(&init_user_ns, fs32_to_cpu(sb, raw_inode->gid)); | |
1da177e4 | 373 | |
bfe86848 | 374 | set_nlink(inode, 1); |
1da177e4 LT |
375 | |
376 | /* | |
377 | * BEFS's time is 64 bits, but current VFS is 32 bits... | |
378 | * BEFS don't have access time. Nor inode change time. VFS | |
379 | * doesn't have creation time. | |
380 | * Also, the lower 16 bits of the last_modified_time and | |
381 | * create_time are just a counter to help ensure uniqueness | |
382 | * for indexing purposes. (PFD, page 54) | |
383 | */ | |
384 | ||
385 | inode->i_mtime.tv_sec = | |
386 | fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16; | |
387 | inode->i_mtime.tv_nsec = 0; /* lower 16 bits are not a time */ | |
388 | inode->i_ctime = inode->i_mtime; | |
389 | inode->i_atime = inode->i_mtime; | |
1da177e4 LT |
390 | |
391 | befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num); | |
392 | befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent); | |
393 | befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes); | |
394 | befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags); | |
395 | ||
396 | if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){ | |
397 | inode->i_size = 0; | |
398 | inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE; | |
399 | strncpy(befs_ino->i_data.symlink, raw_inode->data.symlink, | |
7df5fa06 DG |
400 | BEFS_SYMLINK_LEN - 1); |
401 | befs_ino->i_data.symlink[BEFS_SYMLINK_LEN - 1] = '\0'; | |
1da177e4 LT |
402 | } else { |
403 | int num_blks; | |
404 | ||
405 | befs_ino->i_data.ds = | |
e0e3d32b | 406 | fsds_to_cpu(sb, &raw_inode->data.datastream); |
1da177e4 LT |
407 | |
408 | num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds); | |
409 | inode->i_blocks = | |
410 | num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE); | |
411 | inode->i_size = befs_ino->i_data.ds.size; | |
412 | } | |
413 | ||
414 | inode->i_mapping->a_ops = &befs_aops; | |
415 | ||
416 | if (S_ISREG(inode->i_mode)) { | |
2cf06916 | 417 | inode->i_fop = &generic_ro_fops; |
1da177e4 LT |
418 | } else if (S_ISDIR(inode->i_mode)) { |
419 | inode->i_op = &befs_dir_inode_operations; | |
420 | inode->i_fop = &befs_dir_operations; | |
421 | } else if (S_ISLNK(inode->i_mode)) { | |
48bc06e7 AV |
422 | if (befs_ino->i_flags & BEFS_LONG_SYMLINK) |
423 | inode->i_op = &befs_symlink_inode_operations; | |
424 | else | |
425 | inode->i_op = &befs_fast_symlink_inode_operations; | |
1da177e4 LT |
426 | } else { |
427 | befs_error(sb, "Inode %lu is not a regular file, " | |
428 | "directory or symlink. THAT IS WRONG! BeFS has no " | |
429 | "on disk special files", inode->i_ino); | |
0418726b | 430 | goto unacquire_bh; |
1da177e4 LT |
431 | } |
432 | ||
433 | brelse(bh); | |
dac52fc1 | 434 | befs_debug(sb, "<--- %s", __func__); |
96eb5419 DH |
435 | unlock_new_inode(inode); |
436 | return inode; | |
1da177e4 | 437 | |
0418726b | 438 | unacquire_bh: |
1da177e4 LT |
439 | brelse(bh); |
440 | ||
0418726b | 441 | unacquire_none: |
96eb5419 | 442 | iget_failed(inode); |
dac52fc1 | 443 | befs_debug(sb, "<--- %s - Bad inode", __func__); |
96eb5419 | 444 | return ERR_PTR(ret); |
1da177e4 LT |
445 | } |
446 | ||
447 | /* Initialize the inode cache. Called at fs setup. | |
20c2df83 | 448 | * |
1da177e4 LT |
449 | * Taken from NFS implementation by Al Viro. |
450 | */ | |
91a52ab7 | 451 | static int __init |
1da177e4 LT |
452 | befs_init_inodecache(void) |
453 | { | |
454 | befs_inode_cachep = kmem_cache_create("befs_inode_cache", | |
455 | sizeof (struct befs_inode_info), | |
fffb60f9 PJ |
456 | 0, (SLAB_RECLAIM_ACCOUNT| |
457 | SLAB_MEM_SPREAD), | |
20c2df83 | 458 | init_once); |
1da177e4 | 459 | if (befs_inode_cachep == NULL) { |
dac52fc1 | 460 | pr_err("%s: Couldn't initialize inode slabcache\n", __func__); |
1da177e4 LT |
461 | return -ENOMEM; |
462 | } | |
1da177e4 LT |
463 | return 0; |
464 | } | |
465 | ||
466 | /* Called at fs teardown. | |
467 | * | |
468 | * Taken from NFS implementation by Al Viro. | |
469 | */ | |
470 | static void | |
471 | befs_destroy_inodecache(void) | |
472 | { | |
8c0a8537 KS |
473 | /* |
474 | * Make sure all delayed rcu free inodes are flushed before we | |
475 | * destroy cache. | |
476 | */ | |
477 | rcu_barrier(); | |
1a1d92c1 | 478 | kmem_cache_destroy(befs_inode_cachep); |
1da177e4 LT |
479 | } |
480 | ||
481 | /* | |
482 | * The inode of symbolic link is different to data stream. | |
483 | * The data stream become link name. Unless the LONG_SYMLINK | |
484 | * flag is set. | |
485 | */ | |
db873896 | 486 | static void * |
1da177e4 LT |
487 | befs_follow_link(struct dentry *dentry, struct nameidata *nd) |
488 | { | |
48bc06e7 | 489 | struct super_block *sb = dentry->d_sb; |
1da177e4 | 490 | befs_inode_info *befs_ino = BEFS_I(dentry->d_inode); |
48bc06e7 AV |
491 | befs_data_stream *data = &befs_ino->i_data.ds; |
492 | befs_off_t len = data->size; | |
1da177e4 LT |
493 | char *link; |
494 | ||
48bc06e7 AV |
495 | if (len == 0) { |
496 | befs_error(sb, "Long symlink with illegal length"); | |
497 | link = ERR_PTR(-EIO); | |
498 | } else { | |
499 | befs_debug(sb, "Follow long symlink"); | |
1da177e4 | 500 | |
48bc06e7 AV |
501 | link = kmalloc(len, GFP_NOFS); |
502 | if (!link) { | |
503 | link = ERR_PTR(-ENOMEM); | |
504 | } else if (befs_read_lsymlink(sb, data, link, len) != len) { | |
505 | kfree(link); | |
506 | befs_error(sb, "Failed to read entire long symlink"); | |
1da177e4 | 507 | link = ERR_PTR(-EIO); |
7df5fa06 | 508 | } else { |
48bc06e7 | 509 | link[len - 1] = '\0'; |
1da177e4 | 510 | } |
1da177e4 | 511 | } |
1da177e4 | 512 | nd_set_link(nd, link); |
008b150a | 513 | return NULL; |
1da177e4 LT |
514 | } |
515 | ||
48bc06e7 AV |
516 | |
517 | static void * | |
518 | befs_fast_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1da177e4 LT |
519 | { |
520 | befs_inode_info *befs_ino = BEFS_I(dentry->d_inode); | |
48bc06e7 AV |
521 | nd_set_link(nd, befs_ino->i_data.symlink); |
522 | return NULL; | |
1da177e4 LT |
523 | } |
524 | ||
525 | /* | |
526 | * UTF-8 to NLS charset convert routine | |
527 | * | |
528 | * | |
529 | * Changed 8/10/01 by Will Dyson. Now use uni2char() / char2uni() rather than | |
530 | * the nls tables directly | |
531 | */ | |
532 | ||
533 | static int | |
534 | befs_utf2nls(struct super_block *sb, const char *in, | |
535 | int in_len, char **out, int *out_len) | |
536 | { | |
537 | struct nls_table *nls = BEFS_SB(sb)->nls; | |
538 | int i, o; | |
74675a58 | 539 | unicode_t uni; |
1da177e4 LT |
540 | int unilen, utflen; |
541 | char *result; | |
94f563c4 DC |
542 | /* The utf8->nls conversion won't make the final nls string bigger |
543 | * than the utf one, but if the string is pure ascii they'll have the | |
544 | * same width and an extra char is needed to save the additional \0 | |
545 | */ | |
546 | int maxlen = in_len + 1; | |
1da177e4 | 547 | |
dac52fc1 | 548 | befs_debug(sb, "---> %s", __func__); |
1da177e4 LT |
549 | |
550 | if (!nls) { | |
dac52fc1 | 551 | befs_error(sb, "%s called with no NLS table loaded", __func__); |
1da177e4 LT |
552 | return -EINVAL; |
553 | } | |
554 | ||
555 | *out = result = kmalloc(maxlen, GFP_NOFS); | |
556 | if (!*out) { | |
dac52fc1 | 557 | befs_error(sb, "%s cannot allocate memory", __func__); |
1da177e4 LT |
558 | *out_len = 0; |
559 | return -ENOMEM; | |
560 | } | |
561 | ||
562 | for (i = o = 0; i < in_len; i += utflen, o += unilen) { | |
563 | ||
564 | /* convert from UTF-8 to Unicode */ | |
74675a58 AS |
565 | utflen = utf8_to_utf32(&in[i], in_len - i, &uni); |
566 | if (utflen < 0) | |
1da177e4 | 567 | goto conv_err; |
1da177e4 LT |
568 | |
569 | /* convert from Unicode to nls */ | |
74675a58 AS |
570 | if (uni > MAX_WCHAR_T) |
571 | goto conv_err; | |
1da177e4 | 572 | unilen = nls->uni2char(uni, &result[o], in_len - o); |
74675a58 | 573 | if (unilen < 0) |
1da177e4 | 574 | goto conv_err; |
1da177e4 LT |
575 | } |
576 | result[o] = '\0'; | |
577 | *out_len = o; | |
578 | ||
dac52fc1 | 579 | befs_debug(sb, "<--- %s", __func__); |
1da177e4 LT |
580 | |
581 | return o; | |
582 | ||
583 | conv_err: | |
584 | befs_error(sb, "Name using character set %s contains a character that " | |
585 | "cannot be converted to unicode.", nls->charset); | |
dac52fc1 | 586 | befs_debug(sb, "<--- %s", __func__); |
1da177e4 LT |
587 | kfree(result); |
588 | return -EILSEQ; | |
589 | } | |
590 | ||
591 | /** | |
592 | * befs_nls2utf - Convert NLS string to utf8 encodeing | |
593 | * @sb: Superblock | |
594 | * @src: Input string buffer in NLS format | |
595 | * @srclen: Length of input string in bytes | |
4de151d8 | 596 | * @dest: The output string in UTF-8 format |
1da177e4 LT |
597 | * @destlen: Length of the output buffer |
598 | * | |
599 | * Converts input string @src, which is in the format of the loaded NLS map, | |
600 | * into a utf8 string. | |
601 | * | |
602 | * The destination string @dest is allocated by this function and the caller is | |
603 | * responsible for freeing it with kfree() | |
604 | * | |
605 | * On return, *@destlen is the length of @dest in bytes. | |
606 | * | |
607 | * On success, the return value is the number of utf8 characters written to | |
608 | * the output buffer @dest. | |
609 | * | |
610 | * On Failure, a negative number coresponding to the error code is returned. | |
611 | */ | |
612 | ||
613 | static int | |
614 | befs_nls2utf(struct super_block *sb, const char *in, | |
615 | int in_len, char **out, int *out_len) | |
616 | { | |
617 | struct nls_table *nls = BEFS_SB(sb)->nls; | |
618 | int i, o; | |
619 | wchar_t uni; | |
620 | int unilen, utflen; | |
621 | char *result; | |
94f563c4 DC |
622 | /* There're nls characters that will translate to 3-chars-wide UTF-8 |
623 | * characters, a additional byte is needed to save the final \0 | |
624 | * in special cases */ | |
625 | int maxlen = (3 * in_len) + 1; | |
1da177e4 | 626 | |
dac52fc1 | 627 | befs_debug(sb, "---> %s\n", __func__); |
1da177e4 LT |
628 | |
629 | if (!nls) { | |
dac52fc1 FF |
630 | befs_error(sb, "%s called with no NLS table loaded.", |
631 | __func__); | |
1da177e4 LT |
632 | return -EINVAL; |
633 | } | |
634 | ||
635 | *out = result = kmalloc(maxlen, GFP_NOFS); | |
636 | if (!*out) { | |
dac52fc1 | 637 | befs_error(sb, "%s cannot allocate memory", __func__); |
1da177e4 LT |
638 | *out_len = 0; |
639 | return -ENOMEM; | |
640 | } | |
641 | ||
642 | for (i = o = 0; i < in_len; i += unilen, o += utflen) { | |
643 | ||
644 | /* convert from nls to unicode */ | |
645 | unilen = nls->char2uni(&in[i], in_len - i, &uni); | |
74675a58 | 646 | if (unilen < 0) |
1da177e4 | 647 | goto conv_err; |
1da177e4 LT |
648 | |
649 | /* convert from unicode to UTF-8 */ | |
74675a58 AS |
650 | utflen = utf32_to_utf8(uni, &result[o], 3); |
651 | if (utflen <= 0) | |
1da177e4 | 652 | goto conv_err; |
1da177e4 LT |
653 | } |
654 | ||
655 | result[o] = '\0'; | |
656 | *out_len = o; | |
657 | ||
dac52fc1 | 658 | befs_debug(sb, "<--- %s", __func__); |
1da177e4 LT |
659 | |
660 | return i; | |
661 | ||
662 | conv_err: | |
663 | befs_error(sb, "Name using charecter set %s contains a charecter that " | |
664 | "cannot be converted to unicode.", nls->charset); | |
dac52fc1 | 665 | befs_debug(sb, "<--- %s", __func__); |
1da177e4 LT |
666 | kfree(result); |
667 | return -EILSEQ; | |
668 | } | |
669 | ||
670 | /** | |
671 | * Use the | |
672 | * | |
673 | */ | |
674 | enum { | |
675 | Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err, | |
676 | }; | |
677 | ||
a447c093 | 678 | static const match_table_t befs_tokens = { |
1da177e4 LT |
679 | {Opt_uid, "uid=%d"}, |
680 | {Opt_gid, "gid=%d"}, | |
681 | {Opt_charset, "iocharset=%s"}, | |
682 | {Opt_debug, "debug"}, | |
683 | {Opt_err, NULL} | |
684 | }; | |
685 | ||
686 | static int | |
687 | parse_options(char *options, befs_mount_options * opts) | |
688 | { | |
689 | char *p; | |
690 | substring_t args[MAX_OPT_ARGS]; | |
691 | int option; | |
31aba059 EB |
692 | kuid_t uid; |
693 | kgid_t gid; | |
1da177e4 LT |
694 | |
695 | /* Initialize options */ | |
31aba059 EB |
696 | opts->uid = GLOBAL_ROOT_UID; |
697 | opts->gid = GLOBAL_ROOT_GID; | |
1da177e4 LT |
698 | opts->use_uid = 0; |
699 | opts->use_gid = 0; | |
700 | opts->iocharset = NULL; | |
701 | opts->debug = 0; | |
702 | ||
703 | if (!options) | |
704 | return 1; | |
705 | ||
706 | while ((p = strsep(&options, ",")) != NULL) { | |
707 | int token; | |
708 | if (!*p) | |
709 | continue; | |
710 | ||
711 | token = match_token(p, befs_tokens, args); | |
712 | switch (token) { | |
713 | case Opt_uid: | |
714 | if (match_int(&args[0], &option)) | |
715 | return 0; | |
31aba059 EB |
716 | uid = INVALID_UID; |
717 | if (option >= 0) | |
718 | uid = make_kuid(current_user_ns(), option); | |
719 | if (!uid_valid(uid)) { | |
dac52fc1 FF |
720 | pr_err("Invalid uid %d, " |
721 | "using default\n", option); | |
1da177e4 LT |
722 | break; |
723 | } | |
31aba059 | 724 | opts->uid = uid; |
1da177e4 LT |
725 | opts->use_uid = 1; |
726 | break; | |
727 | case Opt_gid: | |
728 | if (match_int(&args[0], &option)) | |
729 | return 0; | |
31aba059 EB |
730 | gid = INVALID_GID; |
731 | if (option >= 0) | |
732 | gid = make_kgid(current_user_ns(), option); | |
733 | if (!gid_valid(gid)) { | |
dac52fc1 FF |
734 | pr_err("Invalid gid %d, " |
735 | "using default\n", option); | |
1da177e4 LT |
736 | break; |
737 | } | |
31aba059 | 738 | opts->gid = gid; |
1da177e4 LT |
739 | opts->use_gid = 1; |
740 | break; | |
741 | case Opt_charset: | |
742 | kfree(opts->iocharset); | |
743 | opts->iocharset = match_strdup(&args[0]); | |
744 | if (!opts->iocharset) { | |
dac52fc1 FF |
745 | pr_err("allocation failure for " |
746 | "iocharset string\n"); | |
1da177e4 LT |
747 | return 0; |
748 | } | |
749 | break; | |
750 | case Opt_debug: | |
751 | opts->debug = 1; | |
752 | break; | |
753 | default: | |
dac52fc1 FF |
754 | pr_err("Unrecognized mount option \"%s\" " |
755 | "or missing value\n", p); | |
1da177e4 LT |
756 | return 0; |
757 | } | |
758 | } | |
759 | return 1; | |
760 | } | |
761 | ||
762 | /* This function has the responsibiltiy of getting the | |
763 | * filesystem ready for unmounting. | |
25985edc | 764 | * Basically, we free everything that we allocated in |
1da177e4 LT |
765 | * befs_read_inode |
766 | */ | |
767 | static void | |
768 | befs_put_super(struct super_block *sb) | |
769 | { | |
f99d49ad JJ |
770 | kfree(BEFS_SB(sb)->mount_opts.iocharset); |
771 | BEFS_SB(sb)->mount_opts.iocharset = NULL; | |
6d729e44 | 772 | unload_nls(BEFS_SB(sb)->nls); |
f99d49ad JJ |
773 | kfree(sb->s_fs_info); |
774 | sb->s_fs_info = NULL; | |
1da177e4 LT |
775 | } |
776 | ||
777 | /* Allocate private field of the superblock, fill it. | |
778 | * | |
779 | * Finish filling the public superblock fields | |
780 | * Make the root directory | |
781 | * Load a set of NLS translations if needed. | |
782 | */ | |
783 | static int | |
784 | befs_fill_super(struct super_block *sb, void *data, int silent) | |
785 | { | |
786 | struct buffer_head *bh; | |
787 | befs_sb_info *befs_sb; | |
788 | befs_super_block *disk_sb; | |
789 | struct inode *root; | |
96eb5419 | 790 | long ret = -EINVAL; |
1da177e4 LT |
791 | const unsigned long sb_block = 0; |
792 | const off_t x86_sb_off = 512; | |
793 | ||
552c3c6c MS |
794 | save_mount_options(sb, data); |
795 | ||
2d4319ef | 796 | sb->s_fs_info = kzalloc(sizeof(*befs_sb), GFP_KERNEL); |
1da177e4 | 797 | if (sb->s_fs_info == NULL) { |
dac52fc1 | 798 | pr_err("(%s): Unable to allocate memory for private " |
1da177e4 | 799 | "portion of superblock. Bailing.\n", sb->s_id); |
0418726b | 800 | goto unacquire_none; |
1da177e4 LT |
801 | } |
802 | befs_sb = BEFS_SB(sb); | |
1da177e4 LT |
803 | |
804 | if (!parse_options((char *) data, &befs_sb->mount_opts)) { | |
805 | befs_error(sb, "cannot parse mount options"); | |
0418726b | 806 | goto unacquire_priv_sbp; |
1da177e4 LT |
807 | } |
808 | ||
dac52fc1 | 809 | befs_debug(sb, "---> %s", __func__); |
1da177e4 LT |
810 | |
811 | #ifndef CONFIG_BEFS_RW | |
812 | if (!(sb->s_flags & MS_RDONLY)) { | |
813 | befs_warning(sb, | |
814 | "No write support. Marking filesystem read-only"); | |
815 | sb->s_flags |= MS_RDONLY; | |
816 | } | |
817 | #endif /* CONFIG_BEFS_RW */ | |
818 | ||
819 | /* | |
820 | * Set dummy blocksize to read super block. | |
821 | * Will be set to real fs blocksize later. | |
822 | * | |
823 | * Linux 2.4.10 and later refuse to read blocks smaller than | |
824 | * the hardsect size for the device. But we also need to read at | |
825 | * least 1k to get the second 512 bytes of the volume. | |
826 | * -WD 10-26-01 | |
827 | */ | |
828 | sb_min_blocksize(sb, 1024); | |
829 | ||
830 | if (!(bh = sb_bread(sb, sb_block))) { | |
831 | befs_error(sb, "unable to read superblock"); | |
0418726b | 832 | goto unacquire_priv_sbp; |
1da177e4 LT |
833 | } |
834 | ||
835 | /* account for offset of super block on x86 */ | |
836 | disk_sb = (befs_super_block *) bh->b_data; | |
152b95a1 HH |
837 | if ((disk_sb->magic1 == BEFS_SUPER_MAGIC1_LE) || |
838 | (disk_sb->magic1 == BEFS_SUPER_MAGIC1_BE)) { | |
1da177e4 LT |
839 | befs_debug(sb, "Using PPC superblock location"); |
840 | } else { | |
841 | befs_debug(sb, "Using x86 superblock location"); | |
842 | disk_sb = | |
843 | (befs_super_block *) ((void *) bh->b_data + x86_sb_off); | |
844 | } | |
845 | ||
846 | if (befs_load_sb(sb, disk_sb) != BEFS_OK) | |
0418726b | 847 | goto unacquire_bh; |
1da177e4 LT |
848 | |
849 | befs_dump_super_block(sb, disk_sb); | |
850 | ||
851 | brelse(bh); | |
852 | ||
853 | if (befs_check_sb(sb) != BEFS_OK) | |
0418726b | 854 | goto unacquire_priv_sbp; |
1da177e4 LT |
855 | |
856 | if( befs_sb->num_blocks > ~((sector_t)0) ) { | |
dac52fc1 | 857 | befs_error(sb, "blocks count: %llu " |
1da177e4 LT |
858 | "is larger than the host can use", |
859 | befs_sb->num_blocks); | |
0418726b | 860 | goto unacquire_priv_sbp; |
1da177e4 LT |
861 | } |
862 | ||
863 | /* | |
864 | * set up enough so that it can read an inode | |
865 | * Fill in kernel superblock fields from private sb | |
866 | */ | |
867 | sb->s_magic = BEFS_SUPER_MAGIC; | |
868 | /* Set real blocksize of fs */ | |
869 | sb_set_blocksize(sb, (ulong) befs_sb->block_size); | |
b87221de | 870 | sb->s_op = &befs_sops; |
96eb5419 DH |
871 | root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir))); |
872 | if (IS_ERR(root)) { | |
873 | ret = PTR_ERR(root); | |
874 | goto unacquire_priv_sbp; | |
875 | } | |
48fde701 | 876 | sb->s_root = d_make_root(root); |
1da177e4 | 877 | if (!sb->s_root) { |
1da177e4 | 878 | befs_error(sb, "get root inode failed"); |
0418726b | 879 | goto unacquire_priv_sbp; |
1da177e4 LT |
880 | } |
881 | ||
882 | /* load nls library */ | |
883 | if (befs_sb->mount_opts.iocharset) { | |
884 | befs_debug(sb, "Loading nls: %s", | |
885 | befs_sb->mount_opts.iocharset); | |
886 | befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset); | |
887 | if (!befs_sb->nls) { | |
888 | befs_warning(sb, "Cannot load nls %s" | |
889 | " loading default nls", | |
890 | befs_sb->mount_opts.iocharset); | |
891 | befs_sb->nls = load_nls_default(); | |
892 | } | |
893 | /* load default nls if none is specified in mount options */ | |
894 | } else { | |
895 | befs_debug(sb, "Loading default nls"); | |
896 | befs_sb->nls = load_nls_default(); | |
897 | } | |
898 | ||
899 | return 0; | |
900 | /*****************/ | |
0418726b | 901 | unacquire_bh: |
1da177e4 LT |
902 | brelse(bh); |
903 | ||
0418726b | 904 | unacquire_priv_sbp: |
8dd5ca53 | 905 | kfree(befs_sb->mount_opts.iocharset); |
1da177e4 LT |
906 | kfree(sb->s_fs_info); |
907 | ||
0418726b | 908 | unacquire_none: |
1da177e4 | 909 | sb->s_fs_info = NULL; |
96eb5419 | 910 | return ret; |
1da177e4 LT |
911 | } |
912 | ||
913 | static int | |
914 | befs_remount(struct super_block *sb, int *flags, char *data) | |
915 | { | |
02b9984d | 916 | sync_filesystem(sb); |
1da177e4 LT |
917 | if (!(*flags & MS_RDONLY)) |
918 | return -EINVAL; | |
919 | return 0; | |
920 | } | |
921 | ||
922 | static int | |
726c3342 | 923 | befs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 924 | { |
726c3342 | 925 | struct super_block *sb = dentry->d_sb; |
8587246a | 926 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
1da177e4 | 927 | |
dac52fc1 | 928 | befs_debug(sb, "---> %s", __func__); |
1da177e4 LT |
929 | |
930 | buf->f_type = BEFS_SUPER_MAGIC; | |
931 | buf->f_bsize = sb->s_blocksize; | |
932 | buf->f_blocks = BEFS_SB(sb)->num_blocks; | |
933 | buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks; | |
934 | buf->f_bavail = buf->f_bfree; | |
935 | buf->f_files = 0; /* UNKNOWN */ | |
936 | buf->f_ffree = 0; /* UNKNOWN */ | |
8587246a CL |
937 | buf->f_fsid.val[0] = (u32)id; |
938 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
1da177e4 LT |
939 | buf->f_namelen = BEFS_NAME_LEN; |
940 | ||
dac52fc1 | 941 | befs_debug(sb, "<--- %s", __func__); |
1da177e4 LT |
942 | |
943 | return 0; | |
944 | } | |
945 | ||
152a0836 AV |
946 | static struct dentry * |
947 | befs_mount(struct file_system_type *fs_type, int flags, const char *dev_name, | |
948 | void *data) | |
1da177e4 | 949 | { |
152a0836 | 950 | return mount_bdev(fs_type, flags, dev_name, data, befs_fill_super); |
1da177e4 LT |
951 | } |
952 | ||
953 | static struct file_system_type befs_fs_type = { | |
954 | .owner = THIS_MODULE, | |
955 | .name = "befs", | |
152a0836 | 956 | .mount = befs_mount, |
1da177e4 LT |
957 | .kill_sb = kill_block_super, |
958 | .fs_flags = FS_REQUIRES_DEV, | |
959 | }; | |
7f78e035 | 960 | MODULE_ALIAS_FS("befs"); |
1da177e4 LT |
961 | |
962 | static int __init | |
963 | init_befs_fs(void) | |
964 | { | |
965 | int err; | |
966 | ||
dac52fc1 | 967 | pr_info("version: %s\n", BEFS_VERSION); |
1da177e4 LT |
968 | |
969 | err = befs_init_inodecache(); | |
970 | if (err) | |
0418726b | 971 | goto unacquire_none; |
1da177e4 LT |
972 | |
973 | err = register_filesystem(&befs_fs_type); | |
974 | if (err) | |
0418726b | 975 | goto unacquire_inodecache; |
1da177e4 LT |
976 | |
977 | return 0; | |
978 | ||
0418726b | 979 | unacquire_inodecache: |
1da177e4 LT |
980 | befs_destroy_inodecache(); |
981 | ||
0418726b | 982 | unacquire_none: |
1da177e4 LT |
983 | return err; |
984 | } | |
985 | ||
986 | static void __exit | |
987 | exit_befs_fs(void) | |
988 | { | |
989 | befs_destroy_inodecache(); | |
990 | ||
991 | unregister_filesystem(&befs_fs_type); | |
992 | } | |
993 | ||
994 | /* | |
995 | Macros that typecheck the init and exit functions, | |
996 | ensures that they are called at init and cleanup, | |
997 | and eliminates warnings about unused functions. | |
998 | */ | |
999 | module_init(init_befs_fs) | |
1000 | module_exit(exit_befs_fs) |