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Commit | Line | Data |
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1 | /* | |
2 | * linux/fs/befs/linuxvfs.c | |
3 | * | |
4 | * Copyright (C) 2001 Will Dyson <will_dyson@pobox.com | |
5 | * | |
6 | */ | |
7 | ||
8 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
9 | ||
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> | |
20 | #include <linux/sched.h> | |
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" | |
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 | ||
36 | static int befs_readdir(struct file *, struct dir_context *); | |
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); | |
40 | static struct dentry *befs_lookup(struct inode *, struct dentry *, unsigned int); | |
41 | static struct inode *befs_iget(struct super_block *, unsigned long); | |
42 | static struct inode *befs_alloc_inode(struct super_block *sb); | |
43 | static void befs_destroy_inode(struct inode *inode); | |
44 | static void befs_destroy_inodecache(void); | |
45 | static int befs_symlink_readpage(struct file *, struct page *); | |
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 *); | |
52 | static int befs_statfs(struct dentry *, struct kstatfs *); | |
53 | static int parse_options(char *, struct befs_mount_options *); | |
54 | ||
55 | static const struct super_operations befs_sops = { | |
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, | |
61 | .show_options = generic_show_options, | |
62 | }; | |
63 | ||
64 | /* slab cache for befs_inode_info objects */ | |
65 | static struct kmem_cache *befs_inode_cachep; | |
66 | ||
67 | static const struct file_operations befs_dir_operations = { | |
68 | .read = generic_read_dir, | |
69 | .iterate_shared = befs_readdir, | |
70 | .llseek = generic_file_llseek, | |
71 | }; | |
72 | ||
73 | static const struct inode_operations befs_dir_inode_operations = { | |
74 | .lookup = befs_lookup, | |
75 | }; | |
76 | ||
77 | static const struct address_space_operations befs_aops = { | |
78 | .readpage = befs_readpage, | |
79 | .bmap = befs_bmap, | |
80 | }; | |
81 | ||
82 | static const struct address_space_operations befs_symlink_aops = { | |
83 | .readpage = befs_symlink_readpage, | |
84 | }; | |
85 | ||
86 | /* | |
87 | * Called by generic_file_read() to read a page of data | |
88 | * | |
89 | * In turn, simply calls a generic block read function and | |
90 | * passes it the address of befs_get_block, for mapping file | |
91 | * positions to disk blocks. | |
92 | */ | |
93 | static int | |
94 | befs_readpage(struct file *file, struct page *page) | |
95 | { | |
96 | return block_read_full_page(page, befs_get_block); | |
97 | } | |
98 | ||
99 | static sector_t | |
100 | befs_bmap(struct address_space *mapping, sector_t block) | |
101 | { | |
102 | return generic_block_bmap(mapping, block, befs_get_block); | |
103 | } | |
104 | ||
105 | /* | |
106 | * Generic function to map a file position (block) to a | |
107 | * disk offset (passed back in bh_result). | |
108 | * | |
109 | * Used by many higher level functions. | |
110 | * | |
111 | * Calls befs_fblock2brun() in datastream.c to do the real work. | |
112 | * | |
113 | * -WD 10-26-01 | |
114 | */ | |
115 | ||
116 | static int | |
117 | befs_get_block(struct inode *inode, sector_t block, | |
118 | struct buffer_head *bh_result, int create) | |
119 | { | |
120 | struct super_block *sb = inode->i_sb; | |
121 | befs_data_stream *ds = &BEFS_I(inode)->i_data.ds; | |
122 | befs_block_run run = BAD_IADDR; | |
123 | int res = 0; | |
124 | ulong disk_off; | |
125 | ||
126 | befs_debug(sb, "---> befs_get_block() for inode %lu, block %ld", | |
127 | (unsigned long)inode->i_ino, (long)block); | |
128 | if (create) { | |
129 | befs_error(sb, "befs_get_block() was asked to write to " | |
130 | "block %ld in inode %lu", (long)block, | |
131 | (unsigned long)inode->i_ino); | |
132 | return -EPERM; | |
133 | } | |
134 | ||
135 | res = befs_fblock2brun(sb, ds, block, &run); | |
136 | if (res != BEFS_OK) { | |
137 | befs_error(sb, | |
138 | "<--- %s for inode %lu, block %ld ERROR", | |
139 | __func__, (unsigned long)inode->i_ino, | |
140 | (long)block); | |
141 | return -EFBIG; | |
142 | } | |
143 | ||
144 | disk_off = (ulong) iaddr2blockno(sb, &run); | |
145 | ||
146 | map_bh(bh_result, inode->i_sb, disk_off); | |
147 | ||
148 | befs_debug(sb, "<--- %s for inode %lu, block %ld, disk address %lu", | |
149 | __func__, (unsigned long)inode->i_ino, (long)block, | |
150 | (unsigned long)disk_off); | |
151 | ||
152 | return 0; | |
153 | } | |
154 | ||
155 | static struct dentry * | |
156 | befs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) | |
157 | { | |
158 | struct inode *inode; | |
159 | struct super_block *sb = dir->i_sb; | |
160 | const befs_data_stream *ds = &BEFS_I(dir)->i_data.ds; | |
161 | befs_off_t offset; | |
162 | int ret; | |
163 | int utfnamelen; | |
164 | char *utfname; | |
165 | const char *name = dentry->d_name.name; | |
166 | ||
167 | befs_debug(sb, "---> %s name %pd inode %ld", __func__, | |
168 | dentry, dir->i_ino); | |
169 | ||
170 | /* Convert to UTF-8 */ | |
171 | if (BEFS_SB(sb)->nls) { | |
172 | ret = | |
173 | befs_nls2utf(sb, name, strlen(name), &utfname, &utfnamelen); | |
174 | if (ret < 0) { | |
175 | befs_debug(sb, "<--- %s ERROR", __func__); | |
176 | return ERR_PTR(ret); | |
177 | } | |
178 | ret = befs_btree_find(sb, ds, utfname, &offset); | |
179 | kfree(utfname); | |
180 | ||
181 | } else { | |
182 | ret = befs_btree_find(sb, ds, dentry->d_name.name, &offset); | |
183 | } | |
184 | ||
185 | if (ret == BEFS_BT_NOT_FOUND) { | |
186 | befs_debug(sb, "<--- %s %pd not found", __func__, dentry); | |
187 | return ERR_PTR(-ENOENT); | |
188 | ||
189 | } else if (ret != BEFS_OK || offset == 0) { | |
190 | befs_warning(sb, "<--- %s Error", __func__); | |
191 | return ERR_PTR(-ENODATA); | |
192 | } | |
193 | ||
194 | inode = befs_iget(dir->i_sb, (ino_t) offset); | |
195 | if (IS_ERR(inode)) | |
196 | return ERR_CAST(inode); | |
197 | ||
198 | d_add(dentry, inode); | |
199 | ||
200 | befs_debug(sb, "<--- %s", __func__); | |
201 | ||
202 | return NULL; | |
203 | } | |
204 | ||
205 | static int | |
206 | befs_readdir(struct file *file, struct dir_context *ctx) | |
207 | { | |
208 | struct inode *inode = file_inode(file); | |
209 | struct super_block *sb = inode->i_sb; | |
210 | const befs_data_stream *ds = &BEFS_I(inode)->i_data.ds; | |
211 | befs_off_t value; | |
212 | int result; | |
213 | size_t keysize; | |
214 | unsigned char d_type; | |
215 | char keybuf[BEFS_NAME_LEN + 1]; | |
216 | ||
217 | befs_debug(sb, "---> %s name %pD, inode %ld, ctx->pos %lld", | |
218 | __func__, file, inode->i_ino, ctx->pos); | |
219 | ||
220 | more: | |
221 | result = befs_btree_read(sb, ds, ctx->pos, BEFS_NAME_LEN + 1, | |
222 | keybuf, &keysize, &value); | |
223 | ||
224 | if (result == BEFS_ERR) { | |
225 | befs_debug(sb, "<--- %s ERROR", __func__); | |
226 | befs_error(sb, "IO error reading %pD (inode %lu)", | |
227 | file, inode->i_ino); | |
228 | return -EIO; | |
229 | ||
230 | } else if (result == BEFS_BT_END) { | |
231 | befs_debug(sb, "<--- %s END", __func__); | |
232 | return 0; | |
233 | ||
234 | } else if (result == BEFS_BT_EMPTY) { | |
235 | befs_debug(sb, "<--- %s Empty directory", __func__); | |
236 | return 0; | |
237 | } | |
238 | ||
239 | d_type = DT_UNKNOWN; | |
240 | ||
241 | /* Convert to NLS */ | |
242 | if (BEFS_SB(sb)->nls) { | |
243 | char *nlsname; | |
244 | int nlsnamelen; | |
245 | result = | |
246 | befs_utf2nls(sb, keybuf, keysize, &nlsname, &nlsnamelen); | |
247 | if (result < 0) { | |
248 | befs_debug(sb, "<--- %s ERROR", __func__); | |
249 | return result; | |
250 | } | |
251 | if (!dir_emit(ctx, nlsname, nlsnamelen, | |
252 | (ino_t) value, d_type)) { | |
253 | kfree(nlsname); | |
254 | return 0; | |
255 | } | |
256 | kfree(nlsname); | |
257 | } else { | |
258 | if (!dir_emit(ctx, keybuf, keysize, | |
259 | (ino_t) value, d_type)) | |
260 | return 0; | |
261 | } | |
262 | ctx->pos++; | |
263 | goto more; | |
264 | } | |
265 | ||
266 | static struct inode * | |
267 | befs_alloc_inode(struct super_block *sb) | |
268 | { | |
269 | struct befs_inode_info *bi; | |
270 | ||
271 | bi = kmem_cache_alloc(befs_inode_cachep, GFP_KERNEL); | |
272 | if (!bi) | |
273 | return NULL; | |
274 | return &bi->vfs_inode; | |
275 | } | |
276 | ||
277 | static void befs_i_callback(struct rcu_head *head) | |
278 | { | |
279 | struct inode *inode = container_of(head, struct inode, i_rcu); | |
280 | kmem_cache_free(befs_inode_cachep, BEFS_I(inode)); | |
281 | } | |
282 | ||
283 | static void befs_destroy_inode(struct inode *inode) | |
284 | { | |
285 | call_rcu(&inode->i_rcu, befs_i_callback); | |
286 | } | |
287 | ||
288 | static void init_once(void *foo) | |
289 | { | |
290 | struct befs_inode_info *bi = (struct befs_inode_info *) foo; | |
291 | ||
292 | inode_init_once(&bi->vfs_inode); | |
293 | } | |
294 | ||
295 | static struct inode *befs_iget(struct super_block *sb, unsigned long ino) | |
296 | { | |
297 | struct buffer_head *bh; | |
298 | befs_inode *raw_inode; | |
299 | struct befs_sb_info *befs_sb = BEFS_SB(sb); | |
300 | struct befs_inode_info *befs_ino; | |
301 | struct inode *inode; | |
302 | long ret = -EIO; | |
303 | ||
304 | befs_debug(sb, "---> %s inode = %lu", __func__, ino); | |
305 | ||
306 | inode = iget_locked(sb, ino); | |
307 | if (!inode) | |
308 | return ERR_PTR(-ENOMEM); | |
309 | if (!(inode->i_state & I_NEW)) | |
310 | return inode; | |
311 | ||
312 | befs_ino = BEFS_I(inode); | |
313 | ||
314 | /* convert from vfs's inode number to befs's inode number */ | |
315 | befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino); | |
316 | ||
317 | befs_debug(sb, " real inode number [%u, %hu, %hu]", | |
318 | befs_ino->i_inode_num.allocation_group, | |
319 | befs_ino->i_inode_num.start, befs_ino->i_inode_num.len); | |
320 | ||
321 | bh = befs_bread(sb, inode->i_ino); | |
322 | if (!bh) { | |
323 | befs_error(sb, "unable to read inode block - " | |
324 | "inode = %lu", inode->i_ino); | |
325 | goto unacquire_none; | |
326 | } | |
327 | ||
328 | raw_inode = (befs_inode *) bh->b_data; | |
329 | ||
330 | befs_dump_inode(sb, raw_inode); | |
331 | ||
332 | if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) { | |
333 | befs_error(sb, "Bad inode: %lu", inode->i_ino); | |
334 | goto unacquire_bh; | |
335 | } | |
336 | ||
337 | inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode); | |
338 | ||
339 | /* | |
340 | * set uid and gid. But since current BeOS is single user OS, so | |
341 | * you can change by "uid" or "gid" options. | |
342 | */ | |
343 | ||
344 | inode->i_uid = befs_sb->mount_opts.use_uid ? | |
345 | befs_sb->mount_opts.uid : | |
346 | make_kuid(&init_user_ns, fs32_to_cpu(sb, raw_inode->uid)); | |
347 | inode->i_gid = befs_sb->mount_opts.use_gid ? | |
348 | befs_sb->mount_opts.gid : | |
349 | make_kgid(&init_user_ns, fs32_to_cpu(sb, raw_inode->gid)); | |
350 | ||
351 | set_nlink(inode, 1); | |
352 | ||
353 | /* | |
354 | * BEFS's time is 64 bits, but current VFS is 32 bits... | |
355 | * BEFS don't have access time. Nor inode change time. VFS | |
356 | * doesn't have creation time. | |
357 | * Also, the lower 16 bits of the last_modified_time and | |
358 | * create_time are just a counter to help ensure uniqueness | |
359 | * for indexing purposes. (PFD, page 54) | |
360 | */ | |
361 | ||
362 | inode->i_mtime.tv_sec = | |
363 | fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16; | |
364 | inode->i_mtime.tv_nsec = 0; /* lower 16 bits are not a time */ | |
365 | inode->i_ctime = inode->i_mtime; | |
366 | inode->i_atime = inode->i_mtime; | |
367 | ||
368 | befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num); | |
369 | befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent); | |
370 | befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes); | |
371 | befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags); | |
372 | ||
373 | if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){ | |
374 | inode->i_size = 0; | |
375 | inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE; | |
376 | strlcpy(befs_ino->i_data.symlink, raw_inode->data.symlink, | |
377 | BEFS_SYMLINK_LEN); | |
378 | } else { | |
379 | int num_blks; | |
380 | ||
381 | befs_ino->i_data.ds = | |
382 | fsds_to_cpu(sb, &raw_inode->data.datastream); | |
383 | ||
384 | num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds); | |
385 | inode->i_blocks = | |
386 | num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE); | |
387 | inode->i_size = befs_ino->i_data.ds.size; | |
388 | } | |
389 | ||
390 | inode->i_mapping->a_ops = &befs_aops; | |
391 | ||
392 | if (S_ISREG(inode->i_mode)) { | |
393 | inode->i_fop = &generic_ro_fops; | |
394 | } else if (S_ISDIR(inode->i_mode)) { | |
395 | inode->i_op = &befs_dir_inode_operations; | |
396 | inode->i_fop = &befs_dir_operations; | |
397 | } else if (S_ISLNK(inode->i_mode)) { | |
398 | if (befs_ino->i_flags & BEFS_LONG_SYMLINK) { | |
399 | inode->i_op = &page_symlink_inode_operations; | |
400 | inode_nohighmem(inode); | |
401 | inode->i_mapping->a_ops = &befs_symlink_aops; | |
402 | } else { | |
403 | inode->i_link = befs_ino->i_data.symlink; | |
404 | inode->i_op = &simple_symlink_inode_operations; | |
405 | } | |
406 | } else { | |
407 | befs_error(sb, "Inode %lu is not a regular file, " | |
408 | "directory or symlink. THAT IS WRONG! BeFS has no " | |
409 | "on disk special files", inode->i_ino); | |
410 | goto unacquire_bh; | |
411 | } | |
412 | ||
413 | brelse(bh); | |
414 | befs_debug(sb, "<--- %s", __func__); | |
415 | unlock_new_inode(inode); | |
416 | return inode; | |
417 | ||
418 | unacquire_bh: | |
419 | brelse(bh); | |
420 | ||
421 | unacquire_none: | |
422 | iget_failed(inode); | |
423 | befs_debug(sb, "<--- %s - Bad inode", __func__); | |
424 | return ERR_PTR(ret); | |
425 | } | |
426 | ||
427 | /* Initialize the inode cache. Called at fs setup. | |
428 | * | |
429 | * Taken from NFS implementation by Al Viro. | |
430 | */ | |
431 | static int __init | |
432 | befs_init_inodecache(void) | |
433 | { | |
434 | befs_inode_cachep = kmem_cache_create("befs_inode_cache", | |
435 | sizeof (struct befs_inode_info), | |
436 | 0, (SLAB_RECLAIM_ACCOUNT| | |
437 | SLAB_MEM_SPREAD|SLAB_ACCOUNT), | |
438 | init_once); | |
439 | if (befs_inode_cachep == NULL) { | |
440 | pr_err("%s: Couldn't initialize inode slabcache\n", __func__); | |
441 | return -ENOMEM; | |
442 | } | |
443 | return 0; | |
444 | } | |
445 | ||
446 | /* Called at fs teardown. | |
447 | * | |
448 | * Taken from NFS implementation by Al Viro. | |
449 | */ | |
450 | static void | |
451 | befs_destroy_inodecache(void) | |
452 | { | |
453 | /* | |
454 | * Make sure all delayed rcu free inodes are flushed before we | |
455 | * destroy cache. | |
456 | */ | |
457 | rcu_barrier(); | |
458 | kmem_cache_destroy(befs_inode_cachep); | |
459 | } | |
460 | ||
461 | /* | |
462 | * The inode of symbolic link is different to data stream. | |
463 | * The data stream become link name. Unless the LONG_SYMLINK | |
464 | * flag is set. | |
465 | */ | |
466 | static int befs_symlink_readpage(struct file *unused, struct page *page) | |
467 | { | |
468 | struct inode *inode = page->mapping->host; | |
469 | struct super_block *sb = inode->i_sb; | |
470 | struct befs_inode_info *befs_ino = BEFS_I(inode); | |
471 | befs_data_stream *data = &befs_ino->i_data.ds; | |
472 | befs_off_t len = data->size; | |
473 | char *link = page_address(page); | |
474 | ||
475 | if (len == 0 || len > PAGE_SIZE) { | |
476 | befs_error(sb, "Long symlink with illegal length"); | |
477 | goto fail; | |
478 | } | |
479 | befs_debug(sb, "Follow long symlink"); | |
480 | ||
481 | if (befs_read_lsymlink(sb, data, link, len) != len) { | |
482 | befs_error(sb, "Failed to read entire long symlink"); | |
483 | goto fail; | |
484 | } | |
485 | link[len - 1] = '\0'; | |
486 | SetPageUptodate(page); | |
487 | unlock_page(page); | |
488 | return 0; | |
489 | fail: | |
490 | SetPageError(page); | |
491 | unlock_page(page); | |
492 | return -EIO; | |
493 | } | |
494 | ||
495 | /* | |
496 | * UTF-8 to NLS charset convert routine | |
497 | * | |
498 | * | |
499 | * Changed 8/10/01 by Will Dyson. Now use uni2char() / char2uni() rather than | |
500 | * the nls tables directly | |
501 | */ | |
502 | ||
503 | static int | |
504 | befs_utf2nls(struct super_block *sb, const char *in, | |
505 | int in_len, char **out, int *out_len) | |
506 | { | |
507 | struct nls_table *nls = BEFS_SB(sb)->nls; | |
508 | int i, o; | |
509 | unicode_t uni; | |
510 | int unilen, utflen; | |
511 | char *result; | |
512 | /* The utf8->nls conversion won't make the final nls string bigger | |
513 | * than the utf one, but if the string is pure ascii they'll have the | |
514 | * same width and an extra char is needed to save the additional \0 | |
515 | */ | |
516 | int maxlen = in_len + 1; | |
517 | ||
518 | befs_debug(sb, "---> %s", __func__); | |
519 | ||
520 | if (!nls) { | |
521 | befs_error(sb, "%s called with no NLS table loaded", __func__); | |
522 | return -EINVAL; | |
523 | } | |
524 | ||
525 | *out = result = kmalloc(maxlen, GFP_NOFS); | |
526 | if (!*out) { | |
527 | befs_error(sb, "%s cannot allocate memory", __func__); | |
528 | *out_len = 0; | |
529 | return -ENOMEM; | |
530 | } | |
531 | ||
532 | for (i = o = 0; i < in_len; i += utflen, o += unilen) { | |
533 | ||
534 | /* convert from UTF-8 to Unicode */ | |
535 | utflen = utf8_to_utf32(&in[i], in_len - i, &uni); | |
536 | if (utflen < 0) | |
537 | goto conv_err; | |
538 | ||
539 | /* convert from Unicode to nls */ | |
540 | if (uni > MAX_WCHAR_T) | |
541 | goto conv_err; | |
542 | unilen = nls->uni2char(uni, &result[o], in_len - o); | |
543 | if (unilen < 0) | |
544 | goto conv_err; | |
545 | } | |
546 | result[o] = '\0'; | |
547 | *out_len = o; | |
548 | ||
549 | befs_debug(sb, "<--- %s", __func__); | |
550 | ||
551 | return o; | |
552 | ||
553 | conv_err: | |
554 | befs_error(sb, "Name using character set %s contains a character that " | |
555 | "cannot be converted to unicode.", nls->charset); | |
556 | befs_debug(sb, "<--- %s", __func__); | |
557 | kfree(result); | |
558 | return -EILSEQ; | |
559 | } | |
560 | ||
561 | /** | |
562 | * befs_nls2utf - Convert NLS string to utf8 encodeing | |
563 | * @sb: Superblock | |
564 | * @in: Input string buffer in NLS format | |
565 | * @in_len: Length of input string in bytes | |
566 | * @out: The output string in UTF-8 format | |
567 | * @out_len: Length of the output buffer | |
568 | * | |
569 | * Converts input string @in, which is in the format of the loaded NLS map, | |
570 | * into a utf8 string. | |
571 | * | |
572 | * The destination string @out is allocated by this function and the caller is | |
573 | * responsible for freeing it with kfree() | |
574 | * | |
575 | * On return, *@out_len is the length of @out in bytes. | |
576 | * | |
577 | * On success, the return value is the number of utf8 characters written to | |
578 | * the output buffer @out. | |
579 | * | |
580 | * On Failure, a negative number coresponding to the error code is returned. | |
581 | */ | |
582 | ||
583 | static int | |
584 | befs_nls2utf(struct super_block *sb, const char *in, | |
585 | int in_len, char **out, int *out_len) | |
586 | { | |
587 | struct nls_table *nls = BEFS_SB(sb)->nls; | |
588 | int i, o; | |
589 | wchar_t uni; | |
590 | int unilen, utflen; | |
591 | char *result; | |
592 | /* There're nls characters that will translate to 3-chars-wide UTF-8 | |
593 | * characters, a additional byte is needed to save the final \0 | |
594 | * in special cases */ | |
595 | int maxlen = (3 * in_len) + 1; | |
596 | ||
597 | befs_debug(sb, "---> %s\n", __func__); | |
598 | ||
599 | if (!nls) { | |
600 | befs_error(sb, "%s called with no NLS table loaded.", | |
601 | __func__); | |
602 | return -EINVAL; | |
603 | } | |
604 | ||
605 | *out = result = kmalloc(maxlen, GFP_NOFS); | |
606 | if (!*out) { | |
607 | befs_error(sb, "%s cannot allocate memory", __func__); | |
608 | *out_len = 0; | |
609 | return -ENOMEM; | |
610 | } | |
611 | ||
612 | for (i = o = 0; i < in_len; i += unilen, o += utflen) { | |
613 | ||
614 | /* convert from nls to unicode */ | |
615 | unilen = nls->char2uni(&in[i], in_len - i, &uni); | |
616 | if (unilen < 0) | |
617 | goto conv_err; | |
618 | ||
619 | /* convert from unicode to UTF-8 */ | |
620 | utflen = utf32_to_utf8(uni, &result[o], 3); | |
621 | if (utflen <= 0) | |
622 | goto conv_err; | |
623 | } | |
624 | ||
625 | result[o] = '\0'; | |
626 | *out_len = o; | |
627 | ||
628 | befs_debug(sb, "<--- %s", __func__); | |
629 | ||
630 | return i; | |
631 | ||
632 | conv_err: | |
633 | befs_error(sb, "Name using charecter set %s contains a charecter that " | |
634 | "cannot be converted to unicode.", nls->charset); | |
635 | befs_debug(sb, "<--- %s", __func__); | |
636 | kfree(result); | |
637 | return -EILSEQ; | |
638 | } | |
639 | ||
640 | /** | |
641 | * Use the | |
642 | * | |
643 | */ | |
644 | enum { | |
645 | Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err, | |
646 | }; | |
647 | ||
648 | static const match_table_t befs_tokens = { | |
649 | {Opt_uid, "uid=%d"}, | |
650 | {Opt_gid, "gid=%d"}, | |
651 | {Opt_charset, "iocharset=%s"}, | |
652 | {Opt_debug, "debug"}, | |
653 | {Opt_err, NULL} | |
654 | }; | |
655 | ||
656 | static int | |
657 | parse_options(char *options, struct befs_mount_options *opts) | |
658 | { | |
659 | char *p; | |
660 | substring_t args[MAX_OPT_ARGS]; | |
661 | int option; | |
662 | kuid_t uid; | |
663 | kgid_t gid; | |
664 | ||
665 | /* Initialize options */ | |
666 | opts->uid = GLOBAL_ROOT_UID; | |
667 | opts->gid = GLOBAL_ROOT_GID; | |
668 | opts->use_uid = 0; | |
669 | opts->use_gid = 0; | |
670 | opts->iocharset = NULL; | |
671 | opts->debug = 0; | |
672 | ||
673 | if (!options) | |
674 | return 1; | |
675 | ||
676 | while ((p = strsep(&options, ",")) != NULL) { | |
677 | int token; | |
678 | if (!*p) | |
679 | continue; | |
680 | ||
681 | token = match_token(p, befs_tokens, args); | |
682 | switch (token) { | |
683 | case Opt_uid: | |
684 | if (match_int(&args[0], &option)) | |
685 | return 0; | |
686 | uid = INVALID_UID; | |
687 | if (option >= 0) | |
688 | uid = make_kuid(current_user_ns(), option); | |
689 | if (!uid_valid(uid)) { | |
690 | pr_err("Invalid uid %d, " | |
691 | "using default\n", option); | |
692 | break; | |
693 | } | |
694 | opts->uid = uid; | |
695 | opts->use_uid = 1; | |
696 | break; | |
697 | case Opt_gid: | |
698 | if (match_int(&args[0], &option)) | |
699 | return 0; | |
700 | gid = INVALID_GID; | |
701 | if (option >= 0) | |
702 | gid = make_kgid(current_user_ns(), option); | |
703 | if (!gid_valid(gid)) { | |
704 | pr_err("Invalid gid %d, " | |
705 | "using default\n", option); | |
706 | break; | |
707 | } | |
708 | opts->gid = gid; | |
709 | opts->use_gid = 1; | |
710 | break; | |
711 | case Opt_charset: | |
712 | kfree(opts->iocharset); | |
713 | opts->iocharset = match_strdup(&args[0]); | |
714 | if (!opts->iocharset) { | |
715 | pr_err("allocation failure for " | |
716 | "iocharset string\n"); | |
717 | return 0; | |
718 | } | |
719 | break; | |
720 | case Opt_debug: | |
721 | opts->debug = 1; | |
722 | break; | |
723 | default: | |
724 | pr_err("Unrecognized mount option \"%s\" " | |
725 | "or missing value\n", p); | |
726 | return 0; | |
727 | } | |
728 | } | |
729 | return 1; | |
730 | } | |
731 | ||
732 | /* This function has the responsibiltiy of getting the | |
733 | * filesystem ready for unmounting. | |
734 | * Basically, we free everything that we allocated in | |
735 | * befs_read_inode | |
736 | */ | |
737 | static void | |
738 | befs_put_super(struct super_block *sb) | |
739 | { | |
740 | kfree(BEFS_SB(sb)->mount_opts.iocharset); | |
741 | BEFS_SB(sb)->mount_opts.iocharset = NULL; | |
742 | unload_nls(BEFS_SB(sb)->nls); | |
743 | kfree(sb->s_fs_info); | |
744 | sb->s_fs_info = NULL; | |
745 | } | |
746 | ||
747 | /* Allocate private field of the superblock, fill it. | |
748 | * | |
749 | * Finish filling the public superblock fields | |
750 | * Make the root directory | |
751 | * Load a set of NLS translations if needed. | |
752 | */ | |
753 | static int | |
754 | befs_fill_super(struct super_block *sb, void *data, int silent) | |
755 | { | |
756 | struct buffer_head *bh; | |
757 | struct befs_sb_info *befs_sb; | |
758 | befs_super_block *disk_sb; | |
759 | struct inode *root; | |
760 | long ret = -EINVAL; | |
761 | const unsigned long sb_block = 0; | |
762 | const off_t x86_sb_off = 512; | |
763 | ||
764 | save_mount_options(sb, data); | |
765 | ||
766 | sb->s_fs_info = kzalloc(sizeof(*befs_sb), GFP_KERNEL); | |
767 | if (sb->s_fs_info == NULL) { | |
768 | pr_err("(%s): Unable to allocate memory for private " | |
769 | "portion of superblock. Bailing.\n", sb->s_id); | |
770 | goto unacquire_none; | |
771 | } | |
772 | befs_sb = BEFS_SB(sb); | |
773 | ||
774 | if (!parse_options((char *) data, &befs_sb->mount_opts)) { | |
775 | befs_error(sb, "cannot parse mount options"); | |
776 | goto unacquire_priv_sbp; | |
777 | } | |
778 | ||
779 | befs_debug(sb, "---> %s", __func__); | |
780 | ||
781 | if (!(sb->s_flags & MS_RDONLY)) { | |
782 | befs_warning(sb, | |
783 | "No write support. Marking filesystem read-only"); | |
784 | sb->s_flags |= MS_RDONLY; | |
785 | } | |
786 | ||
787 | /* | |
788 | * Set dummy blocksize to read super block. | |
789 | * Will be set to real fs blocksize later. | |
790 | * | |
791 | * Linux 2.4.10 and later refuse to read blocks smaller than | |
792 | * the hardsect size for the device. But we also need to read at | |
793 | * least 1k to get the second 512 bytes of the volume. | |
794 | * -WD 10-26-01 | |
795 | */ | |
796 | sb_min_blocksize(sb, 1024); | |
797 | ||
798 | if (!(bh = sb_bread(sb, sb_block))) { | |
799 | befs_error(sb, "unable to read superblock"); | |
800 | goto unacquire_priv_sbp; | |
801 | } | |
802 | ||
803 | /* account for offset of super block on x86 */ | |
804 | disk_sb = (befs_super_block *) bh->b_data; | |
805 | if ((disk_sb->magic1 == BEFS_SUPER_MAGIC1_LE) || | |
806 | (disk_sb->magic1 == BEFS_SUPER_MAGIC1_BE)) { | |
807 | befs_debug(sb, "Using PPC superblock location"); | |
808 | } else { | |
809 | befs_debug(sb, "Using x86 superblock location"); | |
810 | disk_sb = | |
811 | (befs_super_block *) ((void *) bh->b_data + x86_sb_off); | |
812 | } | |
813 | ||
814 | if ((befs_load_sb(sb, disk_sb) != BEFS_OK) || | |
815 | (befs_check_sb(sb) != BEFS_OK)) | |
816 | goto unacquire_bh; | |
817 | ||
818 | befs_dump_super_block(sb, disk_sb); | |
819 | ||
820 | brelse(bh); | |
821 | ||
822 | if( befs_sb->num_blocks > ~((sector_t)0) ) { | |
823 | befs_error(sb, "blocks count: %llu " | |
824 | "is larger than the host can use", | |
825 | befs_sb->num_blocks); | |
826 | goto unacquire_priv_sbp; | |
827 | } | |
828 | ||
829 | /* | |
830 | * set up enough so that it can read an inode | |
831 | * Fill in kernel superblock fields from private sb | |
832 | */ | |
833 | sb->s_magic = BEFS_SUPER_MAGIC; | |
834 | /* Set real blocksize of fs */ | |
835 | sb_set_blocksize(sb, (ulong) befs_sb->block_size); | |
836 | sb->s_op = &befs_sops; | |
837 | root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir))); | |
838 | if (IS_ERR(root)) { | |
839 | ret = PTR_ERR(root); | |
840 | goto unacquire_priv_sbp; | |
841 | } | |
842 | sb->s_root = d_make_root(root); | |
843 | if (!sb->s_root) { | |
844 | befs_error(sb, "get root inode failed"); | |
845 | goto unacquire_priv_sbp; | |
846 | } | |
847 | ||
848 | /* load nls library */ | |
849 | if (befs_sb->mount_opts.iocharset) { | |
850 | befs_debug(sb, "Loading nls: %s", | |
851 | befs_sb->mount_opts.iocharset); | |
852 | befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset); | |
853 | if (!befs_sb->nls) { | |
854 | befs_warning(sb, "Cannot load nls %s" | |
855 | " loading default nls", | |
856 | befs_sb->mount_opts.iocharset); | |
857 | befs_sb->nls = load_nls_default(); | |
858 | } | |
859 | /* load default nls if none is specified in mount options */ | |
860 | } else { | |
861 | befs_debug(sb, "Loading default nls"); | |
862 | befs_sb->nls = load_nls_default(); | |
863 | } | |
864 | ||
865 | return 0; | |
866 | /*****************/ | |
867 | unacquire_bh: | |
868 | brelse(bh); | |
869 | ||
870 | unacquire_priv_sbp: | |
871 | kfree(befs_sb->mount_opts.iocharset); | |
872 | kfree(sb->s_fs_info); | |
873 | ||
874 | unacquire_none: | |
875 | sb->s_fs_info = NULL; | |
876 | return ret; | |
877 | } | |
878 | ||
879 | static int | |
880 | befs_remount(struct super_block *sb, int *flags, char *data) | |
881 | { | |
882 | sync_filesystem(sb); | |
883 | if (!(*flags & MS_RDONLY)) | |
884 | return -EINVAL; | |
885 | return 0; | |
886 | } | |
887 | ||
888 | static int | |
889 | befs_statfs(struct dentry *dentry, struct kstatfs *buf) | |
890 | { | |
891 | struct super_block *sb = dentry->d_sb; | |
892 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); | |
893 | ||
894 | befs_debug(sb, "---> %s", __func__); | |
895 | ||
896 | buf->f_type = BEFS_SUPER_MAGIC; | |
897 | buf->f_bsize = sb->s_blocksize; | |
898 | buf->f_blocks = BEFS_SB(sb)->num_blocks; | |
899 | buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks; | |
900 | buf->f_bavail = buf->f_bfree; | |
901 | buf->f_files = 0; /* UNKNOWN */ | |
902 | buf->f_ffree = 0; /* UNKNOWN */ | |
903 | buf->f_fsid.val[0] = (u32)id; | |
904 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
905 | buf->f_namelen = BEFS_NAME_LEN; | |
906 | ||
907 | befs_debug(sb, "<--- %s", __func__); | |
908 | ||
909 | return 0; | |
910 | } | |
911 | ||
912 | static struct dentry * | |
913 | befs_mount(struct file_system_type *fs_type, int flags, const char *dev_name, | |
914 | void *data) | |
915 | { | |
916 | return mount_bdev(fs_type, flags, dev_name, data, befs_fill_super); | |
917 | } | |
918 | ||
919 | static struct file_system_type befs_fs_type = { | |
920 | .owner = THIS_MODULE, | |
921 | .name = "befs", | |
922 | .mount = befs_mount, | |
923 | .kill_sb = kill_block_super, | |
924 | .fs_flags = FS_REQUIRES_DEV, | |
925 | }; | |
926 | MODULE_ALIAS_FS("befs"); | |
927 | ||
928 | static int __init | |
929 | init_befs_fs(void) | |
930 | { | |
931 | int err; | |
932 | ||
933 | pr_info("version: %s\n", BEFS_VERSION); | |
934 | ||
935 | err = befs_init_inodecache(); | |
936 | if (err) | |
937 | goto unacquire_none; | |
938 | ||
939 | err = register_filesystem(&befs_fs_type); | |
940 | if (err) | |
941 | goto unacquire_inodecache; | |
942 | ||
943 | return 0; | |
944 | ||
945 | unacquire_inodecache: | |
946 | befs_destroy_inodecache(); | |
947 | ||
948 | unacquire_none: | |
949 | return err; | |
950 | } | |
951 | ||
952 | static void __exit | |
953 | exit_befs_fs(void) | |
954 | { | |
955 | befs_destroy_inodecache(); | |
956 | ||
957 | unregister_filesystem(&befs_fs_type); | |
958 | } | |
959 | ||
960 | /* | |
961 | Macros that typecheck the init and exit functions, | |
962 | ensures that they are called at init and cleanup, | |
963 | and eliminates warnings about unused functions. | |
964 | */ | |
965 | module_init(init_befs_fs) | |
966 | module_exit(exit_befs_fs) |