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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/befs/linuxvfs.c | |
3 | * | |
4 | * Copyright (C) 2001 Will Dyson <will_dyson@pobox.com | |
5 | * | |
6 | */ | |
7 | ||
8 | #include <linux/module.h> | |
9 | #include <linux/slab.h> | |
10 | #include <linux/fs.h> | |
11 | #include <linux/errno.h> | |
12 | #include <linux/stat.h> | |
13 | #include <linux/nls.h> | |
14 | #include <linux/buffer_head.h> | |
15 | #include <linux/vfs.h> | |
16 | #include <linux/parser.h> | |
17 | #include <linux/namei.h> | |
18 | ||
19 | #include "befs.h" | |
20 | #include "btree.h" | |
21 | #include "inode.h" | |
22 | #include "datastream.h" | |
23 | #include "super.h" | |
24 | #include "io.h" | |
25 | #include "endian.h" | |
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 | ||
34 | static int befs_readdir(struct file *, void *, filldir_t); | |
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); | |
38 | static struct dentry *befs_lookup(struct inode *, struct dentry *, struct nameidata *); | |
39 | static void befs_read_inode(struct inode *ino); | |
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 = { | |
56 | .read_inode = befs_read_inode, /* initialize & read inode */ | |
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, | |
62 | }; | |
63 | ||
64 | /* slab cache for befs_inode_info objects */ | |
65 | static kmem_cache_t *befs_inode_cachep; | |
66 | ||
4b6f5d20 | 67 | static const struct file_operations befs_dir_operations = { |
1da177e4 LT |
68 | .read = generic_read_dir, |
69 | .readdir = befs_readdir, | |
70 | }; | |
71 | ||
72 | static struct inode_operations befs_dir_inode_operations = { | |
73 | .lookup = befs_lookup, | |
74 | }; | |
75 | ||
f5e54d6e | 76 | static const struct address_space_operations befs_aops = { |
1da177e4 LT |
77 | .readpage = befs_readpage, |
78 | .sync_page = block_sync_page, | |
79 | .bmap = befs_bmap, | |
80 | }; | |
81 | ||
82 | static struct inode_operations befs_symlink_inode_operations = { | |
83 | .readlink = generic_readlink, | |
84 | .follow_link = befs_follow_link, | |
85 | .put_link = befs_put_link, | |
86 | }; | |
87 | ||
88 | /* | |
89 | * Called by generic_file_read() to read a page of data | |
90 | * | |
91 | * In turn, simply calls a generic block read function and | |
92 | * passes it the address of befs_get_block, for mapping file | |
93 | * positions to disk blocks. | |
94 | */ | |
95 | static int | |
96 | befs_readpage(struct file *file, struct page *page) | |
97 | { | |
98 | return block_read_full_page(page, befs_get_block); | |
99 | } | |
100 | ||
101 | static sector_t | |
102 | befs_bmap(struct address_space *mapping, sector_t block) | |
103 | { | |
104 | return generic_block_bmap(mapping, block, befs_get_block); | |
105 | } | |
106 | ||
107 | /* | |
108 | * Generic function to map a file position (block) to a | |
109 | * disk offset (passed back in bh_result). | |
110 | * | |
111 | * Used by many higher level functions. | |
112 | * | |
113 | * Calls befs_fblock2brun() in datastream.c to do the real work. | |
114 | * | |
115 | * -WD 10-26-01 | |
116 | */ | |
117 | ||
118 | static int | |
119 | befs_get_block(struct inode *inode, sector_t block, | |
120 | struct buffer_head *bh_result, int create) | |
121 | { | |
122 | struct super_block *sb = inode->i_sb; | |
123 | befs_data_stream *ds = &BEFS_I(inode)->i_data.ds; | |
124 | befs_block_run run = BAD_IADDR; | |
125 | int res = 0; | |
126 | ulong disk_off; | |
127 | ||
128 | befs_debug(sb, "---> befs_get_block() for inode %lu, block %ld", | |
129 | inode->i_ino, block); | |
130 | ||
131 | if (block < 0) { | |
132 | befs_error(sb, "befs_get_block() was asked for a block " | |
133 | "number less than zero: block %ld in inode %lu", | |
134 | block, inode->i_ino); | |
135 | return -EIO; | |
136 | } | |
137 | ||
138 | if (create) { | |
139 | befs_error(sb, "befs_get_block() was asked to write to " | |
140 | "block %ld in inode %lu", block, inode->i_ino); | |
141 | return -EPERM; | |
142 | } | |
143 | ||
144 | res = befs_fblock2brun(sb, ds, block, &run); | |
145 | if (res != BEFS_OK) { | |
146 | befs_error(sb, | |
147 | "<--- befs_get_block() for inode %lu, block " | |
148 | "%ld ERROR", inode->i_ino, block); | |
149 | return -EFBIG; | |
150 | } | |
151 | ||
152 | disk_off = (ulong) iaddr2blockno(sb, &run); | |
153 | ||
154 | map_bh(bh_result, inode->i_sb, disk_off); | |
155 | ||
156 | befs_debug(sb, "<--- befs_get_block() for inode %lu, block %ld, " | |
157 | "disk address %lu", inode->i_ino, block, disk_off); | |
158 | ||
159 | return 0; | |
160 | } | |
161 | ||
162 | static struct dentry * | |
163 | befs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) | |
164 | { | |
165 | struct inode *inode = NULL; | |
166 | struct super_block *sb = dir->i_sb; | |
167 | befs_data_stream *ds = &BEFS_I(dir)->i_data.ds; | |
168 | befs_off_t offset; | |
169 | int ret; | |
170 | int utfnamelen; | |
171 | char *utfname; | |
172 | const char *name = dentry->d_name.name; | |
173 | ||
174 | befs_debug(sb, "---> befs_lookup() " | |
175 | "name %s inode %ld", dentry->d_name.name, dir->i_ino); | |
176 | ||
177 | /* Convert to UTF-8 */ | |
178 | if (BEFS_SB(sb)->nls) { | |
179 | ret = | |
180 | befs_nls2utf(sb, name, strlen(name), &utfname, &utfnamelen); | |
181 | if (ret < 0) { | |
182 | befs_debug(sb, "<--- befs_lookup() ERROR"); | |
183 | return ERR_PTR(ret); | |
184 | } | |
185 | ret = befs_btree_find(sb, ds, utfname, &offset); | |
186 | kfree(utfname); | |
187 | ||
188 | } else { | |
189 | ret = befs_btree_find(sb, ds, dentry->d_name.name, &offset); | |
190 | } | |
191 | ||
192 | if (ret == BEFS_BT_NOT_FOUND) { | |
193 | befs_debug(sb, "<--- befs_lookup() %s not found", | |
194 | dentry->d_name.name); | |
195 | return ERR_PTR(-ENOENT); | |
196 | ||
197 | } else if (ret != BEFS_OK || offset == 0) { | |
198 | befs_warning(sb, "<--- befs_lookup() Error"); | |
199 | return ERR_PTR(-ENODATA); | |
200 | } | |
201 | ||
202 | inode = iget(dir->i_sb, (ino_t) offset); | |
203 | if (!inode) | |
204 | return ERR_PTR(-EACCES); | |
205 | ||
206 | d_add(dentry, inode); | |
207 | ||
208 | befs_debug(sb, "<--- befs_lookup()"); | |
209 | ||
210 | return NULL; | |
211 | } | |
212 | ||
213 | static int | |
214 | befs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
215 | { | |
216 | struct inode *inode = filp->f_dentry->d_inode; | |
217 | struct super_block *sb = inode->i_sb; | |
218 | befs_data_stream *ds = &BEFS_I(inode)->i_data.ds; | |
219 | befs_off_t value; | |
220 | int result; | |
221 | size_t keysize; | |
222 | unsigned char d_type; | |
223 | char keybuf[BEFS_NAME_LEN + 1]; | |
224 | char *nlsname; | |
225 | int nlsnamelen; | |
226 | const char *dirname = filp->f_dentry->d_name.name; | |
227 | ||
228 | befs_debug(sb, "---> befs_readdir() " | |
229 | "name %s, inode %ld, filp->f_pos %Ld", | |
230 | dirname, inode->i_ino, filp->f_pos); | |
231 | ||
232 | result = befs_btree_read(sb, ds, filp->f_pos, BEFS_NAME_LEN + 1, | |
233 | keybuf, &keysize, &value); | |
234 | ||
235 | if (result == BEFS_ERR) { | |
236 | befs_debug(sb, "<--- befs_readdir() ERROR"); | |
237 | befs_error(sb, "IO error reading %s (inode %lu)", | |
238 | dirname, inode->i_ino); | |
239 | return -EIO; | |
240 | ||
241 | } else if (result == BEFS_BT_END) { | |
242 | befs_debug(sb, "<--- befs_readdir() END"); | |
243 | return 0; | |
244 | ||
245 | } else if (result == BEFS_BT_EMPTY) { | |
246 | befs_debug(sb, "<--- befs_readdir() Empty directory"); | |
247 | return 0; | |
248 | } | |
249 | ||
250 | d_type = DT_UNKNOWN; | |
251 | ||
252 | /* Convert to NLS */ | |
253 | if (BEFS_SB(sb)->nls) { | |
254 | result = | |
255 | befs_utf2nls(sb, keybuf, keysize, &nlsname, &nlsnamelen); | |
256 | if (result < 0) { | |
257 | befs_debug(sb, "<--- befs_readdir() ERROR"); | |
258 | return result; | |
259 | } | |
260 | result = filldir(dirent, nlsname, nlsnamelen, filp->f_pos, | |
261 | (ino_t) value, d_type); | |
262 | kfree(nlsname); | |
263 | ||
264 | } else { | |
265 | result = filldir(dirent, keybuf, keysize, filp->f_pos, | |
266 | (ino_t) value, d_type); | |
267 | } | |
268 | ||
269 | filp->f_pos++; | |
270 | ||
271 | befs_debug(sb, "<--- befs_readdir() filp->f_pos %Ld", filp->f_pos); | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
276 | static struct inode * | |
277 | befs_alloc_inode(struct super_block *sb) | |
278 | { | |
279 | struct befs_inode_info *bi; | |
280 | bi = (struct befs_inode_info *)kmem_cache_alloc(befs_inode_cachep, | |
281 | SLAB_KERNEL); | |
282 | if (!bi) | |
283 | return NULL; | |
284 | return &bi->vfs_inode; | |
285 | } | |
286 | ||
287 | static void | |
288 | befs_destroy_inode(struct inode *inode) | |
289 | { | |
290 | kmem_cache_free(befs_inode_cachep, BEFS_I(inode)); | |
291 | } | |
292 | ||
293 | static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) | |
294 | { | |
295 | struct befs_inode_info *bi = (struct befs_inode_info *) foo; | |
296 | ||
297 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == | |
298 | SLAB_CTOR_CONSTRUCTOR) { | |
299 | inode_init_once(&bi->vfs_inode); | |
300 | } | |
301 | } | |
302 | ||
303 | static void | |
304 | befs_read_inode(struct inode *inode) | |
305 | { | |
306 | struct buffer_head *bh = NULL; | |
307 | befs_inode *raw_inode = NULL; | |
308 | ||
309 | struct super_block *sb = inode->i_sb; | |
310 | befs_sb_info *befs_sb = BEFS_SB(sb); | |
311 | befs_inode_info *befs_ino = NULL; | |
312 | ||
313 | befs_debug(sb, "---> befs_read_inode() " "inode = %lu", inode->i_ino); | |
314 | ||
315 | befs_ino = BEFS_I(inode); | |
316 | ||
317 | /* convert from vfs's inode number to befs's inode number */ | |
318 | befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino); | |
319 | ||
320 | befs_debug(sb, " real inode number [%u, %hu, %hu]", | |
321 | befs_ino->i_inode_num.allocation_group, | |
322 | befs_ino->i_inode_num.start, befs_ino->i_inode_num.len); | |
323 | ||
324 | bh = befs_bread(sb, inode->i_ino); | |
325 | if (!bh) { | |
326 | befs_error(sb, "unable to read inode block - " | |
327 | "inode = %lu", inode->i_ino); | |
0418726b | 328 | goto unacquire_none; |
1da177e4 LT |
329 | } |
330 | ||
331 | raw_inode = (befs_inode *) bh->b_data; | |
332 | ||
333 | befs_dump_inode(sb, raw_inode); | |
334 | ||
335 | if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) { | |
336 | befs_error(sb, "Bad inode: %lu", inode->i_ino); | |
0418726b | 337 | goto unacquire_bh; |
1da177e4 LT |
338 | } |
339 | ||
340 | inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode); | |
341 | ||
342 | /* | |
343 | * set uid and gid. But since current BeOS is single user OS, so | |
344 | * you can change by "uid" or "gid" options. | |
345 | */ | |
346 | ||
347 | inode->i_uid = befs_sb->mount_opts.use_uid ? | |
348 | befs_sb->mount_opts.uid : (uid_t) fs32_to_cpu(sb, raw_inode->uid); | |
349 | inode->i_gid = befs_sb->mount_opts.use_gid ? | |
350 | befs_sb->mount_opts.gid : (gid_t) fs32_to_cpu(sb, raw_inode->gid); | |
351 | ||
352 | inode->i_nlink = 1; | |
353 | ||
354 | /* | |
355 | * BEFS's time is 64 bits, but current VFS is 32 bits... | |
356 | * BEFS don't have access time. Nor inode change time. VFS | |
357 | * doesn't have creation time. | |
358 | * Also, the lower 16 bits of the last_modified_time and | |
359 | * create_time are just a counter to help ensure uniqueness | |
360 | * for indexing purposes. (PFD, page 54) | |
361 | */ | |
362 | ||
363 | inode->i_mtime.tv_sec = | |
364 | fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16; | |
365 | inode->i_mtime.tv_nsec = 0; /* lower 16 bits are not a time */ | |
366 | inode->i_ctime = inode->i_mtime; | |
367 | inode->i_atime = inode->i_mtime; | |
368 | inode->i_blksize = befs_sb->block_size; | |
369 | ||
370 | befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num); | |
371 | befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent); | |
372 | befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes); | |
373 | befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags); | |
374 | ||
375 | if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){ | |
376 | inode->i_size = 0; | |
377 | inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE; | |
378 | strncpy(befs_ino->i_data.symlink, raw_inode->data.symlink, | |
379 | BEFS_SYMLINK_LEN); | |
380 | } else { | |
381 | int num_blks; | |
382 | ||
383 | befs_ino->i_data.ds = | |
384 | fsds_to_cpu(sb, raw_inode->data.datastream); | |
385 | ||
386 | num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds); | |
387 | inode->i_blocks = | |
388 | num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE); | |
389 | inode->i_size = befs_ino->i_data.ds.size; | |
390 | } | |
391 | ||
392 | inode->i_mapping->a_ops = &befs_aops; | |
393 | ||
394 | if (S_ISREG(inode->i_mode)) { | |
2cf06916 | 395 | inode->i_fop = &generic_ro_fops; |
1da177e4 LT |
396 | } else if (S_ISDIR(inode->i_mode)) { |
397 | inode->i_op = &befs_dir_inode_operations; | |
398 | inode->i_fop = &befs_dir_operations; | |
399 | } else if (S_ISLNK(inode->i_mode)) { | |
400 | inode->i_op = &befs_symlink_inode_operations; | |
401 | } else { | |
402 | befs_error(sb, "Inode %lu is not a regular file, " | |
403 | "directory or symlink. THAT IS WRONG! BeFS has no " | |
404 | "on disk special files", inode->i_ino); | |
0418726b | 405 | goto unacquire_bh; |
1da177e4 LT |
406 | } |
407 | ||
408 | brelse(bh); | |
409 | befs_debug(sb, "<--- befs_read_inode()"); | |
410 | return; | |
411 | ||
0418726b | 412 | unacquire_bh: |
1da177e4 LT |
413 | brelse(bh); |
414 | ||
0418726b | 415 | unacquire_none: |
1da177e4 LT |
416 | make_bad_inode(inode); |
417 | befs_debug(sb, "<--- befs_read_inode() - Bad inode"); | |
418 | return; | |
419 | } | |
420 | ||
421 | /* Initialize the inode cache. Called at fs setup. | |
422 | * | |
423 | * Taken from NFS implementation by Al Viro. | |
424 | */ | |
425 | static int | |
426 | befs_init_inodecache(void) | |
427 | { | |
428 | befs_inode_cachep = kmem_cache_create("befs_inode_cache", | |
429 | sizeof (struct befs_inode_info), | |
fffb60f9 PJ |
430 | 0, (SLAB_RECLAIM_ACCOUNT| |
431 | SLAB_MEM_SPREAD), | |
1da177e4 LT |
432 | init_once, NULL); |
433 | if (befs_inode_cachep == NULL) { | |
434 | printk(KERN_ERR "befs_init_inodecache: " | |
435 | "Couldn't initalize inode slabcache\n"); | |
436 | return -ENOMEM; | |
437 | } | |
438 | ||
439 | return 0; | |
440 | } | |
441 | ||
442 | /* Called at fs teardown. | |
443 | * | |
444 | * Taken from NFS implementation by Al Viro. | |
445 | */ | |
446 | static void | |
447 | befs_destroy_inodecache(void) | |
448 | { | |
1a1d92c1 | 449 | kmem_cache_destroy(befs_inode_cachep); |
1da177e4 LT |
450 | } |
451 | ||
452 | /* | |
453 | * The inode of symbolic link is different to data stream. | |
454 | * The data stream become link name. Unless the LONG_SYMLINK | |
455 | * flag is set. | |
456 | */ | |
db873896 | 457 | static void * |
1da177e4 LT |
458 | befs_follow_link(struct dentry *dentry, struct nameidata *nd) |
459 | { | |
460 | befs_inode_info *befs_ino = BEFS_I(dentry->d_inode); | |
461 | char *link; | |
462 | ||
463 | if (befs_ino->i_flags & BEFS_LONG_SYMLINK) { | |
464 | struct super_block *sb = dentry->d_sb; | |
465 | befs_data_stream *data = &befs_ino->i_data.ds; | |
466 | befs_off_t len = data->size; | |
467 | ||
468 | befs_debug(sb, "Follow long symlink"); | |
469 | ||
470 | link = kmalloc(len, GFP_NOFS); | |
471 | if (!link) { | |
472 | link = ERR_PTR(-ENOMEM); | |
473 | } else if (befs_read_lsymlink(sb, data, link, len) != len) { | |
474 | kfree(link); | |
475 | befs_error(sb, "Failed to read entire long symlink"); | |
476 | link = ERR_PTR(-EIO); | |
477 | } | |
478 | } else { | |
479 | link = befs_ino->i_data.symlink; | |
480 | } | |
481 | ||
482 | nd_set_link(nd, link); | |
008b150a | 483 | return NULL; |
1da177e4 LT |
484 | } |
485 | ||
008b150a | 486 | static void befs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) |
1da177e4 LT |
487 | { |
488 | befs_inode_info *befs_ino = BEFS_I(dentry->d_inode); | |
489 | if (befs_ino->i_flags & BEFS_LONG_SYMLINK) { | |
490 | char *p = nd_get_link(nd); | |
491 | if (!IS_ERR(p)) | |
492 | kfree(p); | |
493 | } | |
494 | } | |
495 | ||
496 | /* | |
497 | * UTF-8 to NLS charset convert routine | |
498 | * | |
499 | * | |
500 | * Changed 8/10/01 by Will Dyson. Now use uni2char() / char2uni() rather than | |
501 | * the nls tables directly | |
502 | */ | |
503 | ||
504 | static int | |
505 | befs_utf2nls(struct super_block *sb, const char *in, | |
506 | int in_len, char **out, int *out_len) | |
507 | { | |
508 | struct nls_table *nls = BEFS_SB(sb)->nls; | |
509 | int i, o; | |
510 | wchar_t uni; | |
511 | int unilen, utflen; | |
512 | char *result; | |
94f563c4 DC |
513 | /* The utf8->nls conversion won't make the final nls string bigger |
514 | * than the utf one, but if the string is pure ascii they'll have the | |
515 | * same width and an extra char is needed to save the additional \0 | |
516 | */ | |
517 | int maxlen = in_len + 1; | |
1da177e4 LT |
518 | |
519 | befs_debug(sb, "---> utf2nls()"); | |
520 | ||
521 | if (!nls) { | |
522 | befs_error(sb, "befs_utf2nls called with no NLS table loaded"); | |
523 | return -EINVAL; | |
524 | } | |
525 | ||
526 | *out = result = kmalloc(maxlen, GFP_NOFS); | |
527 | if (!*out) { | |
528 | befs_error(sb, "befs_utf2nls() cannot allocate memory"); | |
529 | *out_len = 0; | |
530 | return -ENOMEM; | |
531 | } | |
532 | ||
533 | for (i = o = 0; i < in_len; i += utflen, o += unilen) { | |
534 | ||
535 | /* convert from UTF-8 to Unicode */ | |
536 | utflen = utf8_mbtowc(&uni, &in[i], in_len - i); | |
537 | if (utflen < 0) { | |
538 | goto conv_err; | |
539 | } | |
540 | ||
541 | /* convert from Unicode to nls */ | |
542 | unilen = nls->uni2char(uni, &result[o], in_len - o); | |
543 | if (unilen < 0) { | |
544 | goto conv_err; | |
545 | } | |
546 | } | |
547 | result[o] = '\0'; | |
548 | *out_len = o; | |
549 | ||
550 | befs_debug(sb, "<--- utf2nls()"); | |
551 | ||
552 | return o; | |
553 | ||
554 | conv_err: | |
555 | befs_error(sb, "Name using character set %s contains a character that " | |
556 | "cannot be converted to unicode.", nls->charset); | |
557 | befs_debug(sb, "<--- utf2nls()"); | |
558 | kfree(result); | |
559 | return -EILSEQ; | |
560 | } | |
561 | ||
562 | /** | |
563 | * befs_nls2utf - Convert NLS string to utf8 encodeing | |
564 | * @sb: Superblock | |
565 | * @src: Input string buffer in NLS format | |
566 | * @srclen: Length of input string in bytes | |
4de151d8 | 567 | * @dest: The output string in UTF-8 format |
1da177e4 LT |
568 | * @destlen: Length of the output buffer |
569 | * | |
570 | * Converts input string @src, which is in the format of the loaded NLS map, | |
571 | * into a utf8 string. | |
572 | * | |
573 | * The destination string @dest is allocated by this function and the caller is | |
574 | * responsible for freeing it with kfree() | |
575 | * | |
576 | * On return, *@destlen is the length of @dest in bytes. | |
577 | * | |
578 | * On success, the return value is the number of utf8 characters written to | |
579 | * the output buffer @dest. | |
580 | * | |
581 | * On Failure, a negative number coresponding to the error code is returned. | |
582 | */ | |
583 | ||
584 | static int | |
585 | befs_nls2utf(struct super_block *sb, const char *in, | |
586 | int in_len, char **out, int *out_len) | |
587 | { | |
588 | struct nls_table *nls = BEFS_SB(sb)->nls; | |
589 | int i, o; | |
590 | wchar_t uni; | |
591 | int unilen, utflen; | |
592 | char *result; | |
94f563c4 DC |
593 | /* There're nls characters that will translate to 3-chars-wide UTF-8 |
594 | * characters, a additional byte is needed to save the final \0 | |
595 | * in special cases */ | |
596 | int maxlen = (3 * in_len) + 1; | |
1da177e4 LT |
597 | |
598 | befs_debug(sb, "---> nls2utf()\n"); | |
599 | ||
600 | if (!nls) { | |
601 | befs_error(sb, "befs_nls2utf called with no NLS table loaded."); | |
602 | return -EINVAL; | |
603 | } | |
604 | ||
605 | *out = result = kmalloc(maxlen, GFP_NOFS); | |
606 | if (!*out) { | |
607 | befs_error(sb, "befs_nls2utf() cannot allocate memory"); | |
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 | ||
620 | /* convert from unicode to UTF-8 */ | |
621 | utflen = utf8_wctomb(&result[o], uni, 3); | |
622 | if (utflen <= 0) { | |
623 | goto conv_err; | |
624 | } | |
625 | } | |
626 | ||
627 | result[o] = '\0'; | |
628 | *out_len = o; | |
629 | ||
630 | befs_debug(sb, "<--- nls2utf()"); | |
631 | ||
632 | return i; | |
633 | ||
634 | conv_err: | |
635 | befs_error(sb, "Name using charecter set %s contains a charecter that " | |
636 | "cannot be converted to unicode.", nls->charset); | |
637 | befs_debug(sb, "<--- nls2utf()"); | |
638 | kfree(result); | |
639 | return -EILSEQ; | |
640 | } | |
641 | ||
642 | /** | |
643 | * Use the | |
644 | * | |
645 | */ | |
646 | enum { | |
647 | Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err, | |
648 | }; | |
649 | ||
650 | static match_table_t befs_tokens = { | |
651 | {Opt_uid, "uid=%d"}, | |
652 | {Opt_gid, "gid=%d"}, | |
653 | {Opt_charset, "iocharset=%s"}, | |
654 | {Opt_debug, "debug"}, | |
655 | {Opt_err, NULL} | |
656 | }; | |
657 | ||
658 | static int | |
659 | parse_options(char *options, befs_mount_options * opts) | |
660 | { | |
661 | char *p; | |
662 | substring_t args[MAX_OPT_ARGS]; | |
663 | int option; | |
664 | ||
665 | /* Initialize options */ | |
666 | opts->uid = 0; | |
667 | opts->gid = 0; | |
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 | if (option < 0) { | |
687 | printk(KERN_ERR "BeFS: Invalid uid %d, " | |
688 | "using default\n", option); | |
689 | break; | |
690 | } | |
691 | opts->uid = option; | |
692 | opts->use_uid = 1; | |
693 | break; | |
694 | case Opt_gid: | |
695 | if (match_int(&args[0], &option)) | |
696 | return 0; | |
697 | if (option < 0) { | |
698 | printk(KERN_ERR "BeFS: Invalid gid %d, " | |
699 | "using default\n", option); | |
700 | break; | |
701 | } | |
702 | opts->gid = option; | |
703 | opts->use_gid = 1; | |
704 | break; | |
705 | case Opt_charset: | |
706 | kfree(opts->iocharset); | |
707 | opts->iocharset = match_strdup(&args[0]); | |
708 | if (!opts->iocharset) { | |
709 | printk(KERN_ERR "BeFS: allocation failure for " | |
710 | "iocharset string\n"); | |
711 | return 0; | |
712 | } | |
713 | break; | |
714 | case Opt_debug: | |
715 | opts->debug = 1; | |
716 | break; | |
717 | default: | |
718 | printk(KERN_ERR "BeFS: Unrecognized mount option \"%s\" " | |
719 | "or missing value\n", p); | |
720 | return 0; | |
721 | } | |
722 | } | |
723 | return 1; | |
724 | } | |
725 | ||
726 | /* This function has the responsibiltiy of getting the | |
727 | * filesystem ready for unmounting. | |
728 | * Basicly, we free everything that we allocated in | |
729 | * befs_read_inode | |
730 | */ | |
731 | static void | |
732 | befs_put_super(struct super_block *sb) | |
733 | { | |
f99d49ad JJ |
734 | kfree(BEFS_SB(sb)->mount_opts.iocharset); |
735 | BEFS_SB(sb)->mount_opts.iocharset = NULL; | |
1da177e4 LT |
736 | |
737 | if (BEFS_SB(sb)->nls) { | |
738 | unload_nls(BEFS_SB(sb)->nls); | |
739 | BEFS_SB(sb)->nls = NULL; | |
740 | } | |
741 | ||
f99d49ad JJ |
742 | kfree(sb->s_fs_info); |
743 | sb->s_fs_info = NULL; | |
1da177e4 LT |
744 | return; |
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 | befs_sb_info *befs_sb; | |
758 | befs_super_block *disk_sb; | |
759 | struct inode *root; | |
760 | ||
761 | const unsigned long sb_block = 0; | |
762 | const off_t x86_sb_off = 512; | |
763 | ||
764 | sb->s_fs_info = kmalloc(sizeof (*befs_sb), GFP_KERNEL); | |
765 | if (sb->s_fs_info == NULL) { | |
766 | printk(KERN_ERR | |
767 | "BeFS(%s): Unable to allocate memory for private " | |
768 | "portion of superblock. Bailing.\n", sb->s_id); | |
0418726b | 769 | goto unacquire_none; |
1da177e4 LT |
770 | } |
771 | befs_sb = BEFS_SB(sb); | |
772 | memset(befs_sb, 0, sizeof(befs_sb_info)); | |
773 | ||
774 | if (!parse_options((char *) data, &befs_sb->mount_opts)) { | |
775 | befs_error(sb, "cannot parse mount options"); | |
0418726b | 776 | goto unacquire_priv_sbp; |
1da177e4 LT |
777 | } |
778 | ||
779 | befs_debug(sb, "---> befs_fill_super()"); | |
780 | ||
781 | #ifndef CONFIG_BEFS_RW | |
782 | if (!(sb->s_flags & MS_RDONLY)) { | |
783 | befs_warning(sb, | |
784 | "No write support. Marking filesystem read-only"); | |
785 | sb->s_flags |= MS_RDONLY; | |
786 | } | |
787 | #endif /* CONFIG_BEFS_RW */ | |
788 | ||
789 | /* | |
790 | * Set dummy blocksize to read super block. | |
791 | * Will be set to real fs blocksize later. | |
792 | * | |
793 | * Linux 2.4.10 and later refuse to read blocks smaller than | |
794 | * the hardsect size for the device. But we also need to read at | |
795 | * least 1k to get the second 512 bytes of the volume. | |
796 | * -WD 10-26-01 | |
797 | */ | |
798 | sb_min_blocksize(sb, 1024); | |
799 | ||
800 | if (!(bh = sb_bread(sb, sb_block))) { | |
801 | befs_error(sb, "unable to read superblock"); | |
0418726b | 802 | goto unacquire_priv_sbp; |
1da177e4 LT |
803 | } |
804 | ||
805 | /* account for offset of super block on x86 */ | |
806 | disk_sb = (befs_super_block *) bh->b_data; | |
807 | if ((le32_to_cpu(disk_sb->magic1) == BEFS_SUPER_MAGIC1) || | |
808 | (be32_to_cpu(disk_sb->magic1) == BEFS_SUPER_MAGIC1)) { | |
809 | befs_debug(sb, "Using PPC superblock location"); | |
810 | } else { | |
811 | befs_debug(sb, "Using x86 superblock location"); | |
812 | disk_sb = | |
813 | (befs_super_block *) ((void *) bh->b_data + x86_sb_off); | |
814 | } | |
815 | ||
816 | if (befs_load_sb(sb, disk_sb) != BEFS_OK) | |
0418726b | 817 | goto unacquire_bh; |
1da177e4 LT |
818 | |
819 | befs_dump_super_block(sb, disk_sb); | |
820 | ||
821 | brelse(bh); | |
822 | ||
823 | if (befs_check_sb(sb) != BEFS_OK) | |
0418726b | 824 | goto unacquire_priv_sbp; |
1da177e4 LT |
825 | |
826 | if( befs_sb->num_blocks > ~((sector_t)0) ) { | |
827 | befs_error(sb, "blocks count: %Lu " | |
828 | "is larger than the host can use", | |
829 | befs_sb->num_blocks); | |
0418726b | 830 | goto unacquire_priv_sbp; |
1da177e4 LT |
831 | } |
832 | ||
833 | /* | |
834 | * set up enough so that it can read an inode | |
835 | * Fill in kernel superblock fields from private sb | |
836 | */ | |
837 | sb->s_magic = BEFS_SUPER_MAGIC; | |
838 | /* Set real blocksize of fs */ | |
839 | sb_set_blocksize(sb, (ulong) befs_sb->block_size); | |
840 | sb->s_op = (struct super_operations *) &befs_sops; | |
841 | root = iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir))); | |
842 | sb->s_root = d_alloc_root(root); | |
843 | if (!sb->s_root) { | |
844 | iput(root); | |
845 | befs_error(sb, "get root inode failed"); | |
0418726b | 846 | goto unacquire_priv_sbp; |
1da177e4 LT |
847 | } |
848 | ||
849 | /* load nls library */ | |
850 | if (befs_sb->mount_opts.iocharset) { | |
851 | befs_debug(sb, "Loading nls: %s", | |
852 | befs_sb->mount_opts.iocharset); | |
853 | befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset); | |
854 | if (!befs_sb->nls) { | |
855 | befs_warning(sb, "Cannot load nls %s" | |
856 | " loading default nls", | |
857 | befs_sb->mount_opts.iocharset); | |
858 | befs_sb->nls = load_nls_default(); | |
859 | } | |
860 | /* load default nls if none is specified in mount options */ | |
861 | } else { | |
862 | befs_debug(sb, "Loading default nls"); | |
863 | befs_sb->nls = load_nls_default(); | |
864 | } | |
865 | ||
866 | return 0; | |
867 | /*****************/ | |
0418726b | 868 | unacquire_bh: |
1da177e4 LT |
869 | brelse(bh); |
870 | ||
0418726b | 871 | unacquire_priv_sbp: |
1da177e4 LT |
872 | kfree(sb->s_fs_info); |
873 | ||
0418726b | 874 | unacquire_none: |
1da177e4 LT |
875 | sb->s_fs_info = NULL; |
876 | return -EINVAL; | |
877 | } | |
878 | ||
879 | static int | |
880 | befs_remount(struct super_block *sb, int *flags, char *data) | |
881 | { | |
882 | if (!(*flags & MS_RDONLY)) | |
883 | return -EINVAL; | |
884 | return 0; | |
885 | } | |
886 | ||
887 | static int | |
726c3342 | 888 | befs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 889 | { |
726c3342 | 890 | struct super_block *sb = dentry->d_sb; |
1da177e4 LT |
891 | |
892 | befs_debug(sb, "---> befs_statfs()"); | |
893 | ||
894 | buf->f_type = BEFS_SUPER_MAGIC; | |
895 | buf->f_bsize = sb->s_blocksize; | |
896 | buf->f_blocks = BEFS_SB(sb)->num_blocks; | |
897 | buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks; | |
898 | buf->f_bavail = buf->f_bfree; | |
899 | buf->f_files = 0; /* UNKNOWN */ | |
900 | buf->f_ffree = 0; /* UNKNOWN */ | |
901 | buf->f_namelen = BEFS_NAME_LEN; | |
902 | ||
903 | befs_debug(sb, "<--- befs_statfs()"); | |
904 | ||
905 | return 0; | |
906 | } | |
907 | ||
454e2398 | 908 | static int |
1da177e4 | 909 | befs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, |
454e2398 | 910 | void *data, struct vfsmount *mnt) |
1da177e4 | 911 | { |
454e2398 DH |
912 | return get_sb_bdev(fs_type, flags, dev_name, data, befs_fill_super, |
913 | mnt); | |
1da177e4 LT |
914 | } |
915 | ||
916 | static struct file_system_type befs_fs_type = { | |
917 | .owner = THIS_MODULE, | |
918 | .name = "befs", | |
919 | .get_sb = befs_get_sb, | |
920 | .kill_sb = kill_block_super, | |
921 | .fs_flags = FS_REQUIRES_DEV, | |
922 | }; | |
923 | ||
924 | static int __init | |
925 | init_befs_fs(void) | |
926 | { | |
927 | int err; | |
928 | ||
929 | printk(KERN_INFO "BeFS version: %s\n", BEFS_VERSION); | |
930 | ||
931 | err = befs_init_inodecache(); | |
932 | if (err) | |
0418726b | 933 | goto unacquire_none; |
1da177e4 LT |
934 | |
935 | err = register_filesystem(&befs_fs_type); | |
936 | if (err) | |
0418726b | 937 | goto unacquire_inodecache; |
1da177e4 LT |
938 | |
939 | return 0; | |
940 | ||
0418726b | 941 | unacquire_inodecache: |
1da177e4 LT |
942 | befs_destroy_inodecache(); |
943 | ||
0418726b | 944 | unacquire_none: |
1da177e4 LT |
945 | return err; |
946 | } | |
947 | ||
948 | static void __exit | |
949 | exit_befs_fs(void) | |
950 | { | |
951 | befs_destroy_inodecache(); | |
952 | ||
953 | unregister_filesystem(&befs_fs_type); | |
954 | } | |
955 | ||
956 | /* | |
957 | Macros that typecheck the init and exit functions, | |
958 | ensures that they are called at init and cleanup, | |
959 | and eliminates warnings about unused functions. | |
960 | */ | |
961 | module_init(init_befs_fs) | |
962 | module_exit(exit_befs_fs) |