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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 | #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 | |
26 | MODULE_DESCRIPTION("BeOS File System (BeFS) driver"); |
27 | MODULE_AUTHOR("Will Dyson"); |
28 | MODULE_LICENSE("GPL"); |
29 | |
30 | /* The units the vfs expects inode->i_blocks to be in */ |
31 | #define VFS_BLOCK_SIZE 512 |
32 | |
33 | static int befs_readdir(struct file *, void *, filldir_t); |
34 | static int befs_get_block(struct inode *, sector_t, struct buffer_head *, int); |
35 | static int befs_readpage(struct file *file, struct page *page); |
36 | static sector_t befs_bmap(struct address_space *mapping, sector_t block); |
37 | static struct dentry *befs_lookup(struct inode *, struct dentry *, struct nameidata *); |
38 | static struct inode *befs_iget(struct super_block *, unsigned long); |
39 | static struct inode *befs_alloc_inode(struct super_block *sb); |
40 | static void befs_destroy_inode(struct inode *inode); |
41 | static int befs_init_inodecache(void); |
42 | static void befs_destroy_inodecache(void); |
43 | static void *befs_follow_link(struct dentry *, struct nameidata *); |
44 | static void befs_put_link(struct dentry *, struct nameidata *, void *); |
45 | static int befs_utf2nls(struct super_block *sb, const char *in, int in_len, |
46 | char **out, int *out_len); |
47 | static int befs_nls2utf(struct super_block *sb, const char *in, int in_len, |
48 | char **out, int *out_len); |
49 | static void befs_put_super(struct super_block *); |
50 | static int befs_remount(struct super_block *, int *, char *); |
51 | static int befs_statfs(struct dentry *, struct kstatfs *); |
52 | static int parse_options(char *, befs_mount_options *); |
53 | |
54 | static const struct super_operations befs_sops = { |
55 | .alloc_inode = befs_alloc_inode, /* allocate a new inode */ |
56 | .destroy_inode = befs_destroy_inode, /* deallocate an inode */ |
57 | .put_super = befs_put_super, /* uninit super */ |
58 | .statfs = befs_statfs, /* statfs */ |
59 | .remount_fs = befs_remount, |
60 | .show_options = generic_show_options, |
61 | }; |
62 | |
63 | /* slab cache for befs_inode_info objects */ |
64 | static struct kmem_cache *befs_inode_cachep; |
65 | |
66 | static const struct file_operations befs_dir_operations = { |
67 | .read = generic_read_dir, |
68 | .readdir = befs_readdir, |
69 | .llseek = generic_file_llseek, |
70 | }; |
71 | |
72 | static const struct inode_operations befs_dir_inode_operations = { |
73 | .lookup = befs_lookup, |
74 | }; |
75 | |
76 | static const struct address_space_operations befs_aops = { |
77 | .readpage = befs_readpage, |
78 | .sync_page = block_sync_page, |
79 | .bmap = befs_bmap, |
80 | }; |
81 | |
82 | static const 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 = befs_iget(dir->i_sb, (ino_t) offset); |
203 | if (IS_ERR(inode)) |
204 | return ERR_CAST(inode); |
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_path.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_path.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 | GFP_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) |
294 | { |
295 | struct befs_inode_info *bi = (struct befs_inode_info *) foo; |
296 | |
297 | inode_init_once(&bi->vfs_inode); |
298 | } |
299 | |
300 | static struct inode *befs_iget(struct super_block *sb, unsigned long ino) |
301 | { |
302 | struct buffer_head *bh = NULL; |
303 | befs_inode *raw_inode = NULL; |
304 | |
305 | befs_sb_info *befs_sb = BEFS_SB(sb); |
306 | befs_inode_info *befs_ino = NULL; |
307 | struct inode *inode; |
308 | long ret = -EIO; |
309 | |
310 | befs_debug(sb, "---> befs_read_inode() " "inode = %lu", ino); |
311 | |
312 | inode = iget_locked(sb, ino); |
313 | if (IS_ERR(inode)) |
314 | return inode; |
315 | if (!(inode->i_state & I_NEW)) |
316 | return inode; |
317 | |
318 | befs_ino = BEFS_I(inode); |
319 | |
320 | /* convert from vfs's inode number to befs's inode number */ |
321 | befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino); |
322 | |
323 | befs_debug(sb, " real inode number [%u, %hu, %hu]", |
324 | befs_ino->i_inode_num.allocation_group, |
325 | befs_ino->i_inode_num.start, befs_ino->i_inode_num.len); |
326 | |
327 | bh = befs_bread(sb, inode->i_ino); |
328 | if (!bh) { |
329 | befs_error(sb, "unable to read inode block - " |
330 | "inode = %lu", inode->i_ino); |
331 | goto unacquire_none; |
332 | } |
333 | |
334 | raw_inode = (befs_inode *) bh->b_data; |
335 | |
336 | befs_dump_inode(sb, raw_inode); |
337 | |
338 | if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) { |
339 | befs_error(sb, "Bad inode: %lu", inode->i_ino); |
340 | goto unacquire_bh; |
341 | } |
342 | |
343 | inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode); |
344 | |
345 | /* |
346 | * set uid and gid. But since current BeOS is single user OS, so |
347 | * you can change by "uid" or "gid" options. |
348 | */ |
349 | |
350 | inode->i_uid = befs_sb->mount_opts.use_uid ? |
351 | befs_sb->mount_opts.uid : (uid_t) fs32_to_cpu(sb, raw_inode->uid); |
352 | inode->i_gid = befs_sb->mount_opts.use_gid ? |
353 | befs_sb->mount_opts.gid : (gid_t) fs32_to_cpu(sb, raw_inode->gid); |
354 | |
355 | inode->i_nlink = 1; |
356 | |
357 | /* |
358 | * BEFS's time is 64 bits, but current VFS is 32 bits... |
359 | * BEFS don't have access time. Nor inode change time. VFS |
360 | * doesn't have creation time. |
361 | * Also, the lower 16 bits of the last_modified_time and |
362 | * create_time are just a counter to help ensure uniqueness |
363 | * for indexing purposes. (PFD, page 54) |
364 | */ |
365 | |
366 | inode->i_mtime.tv_sec = |
367 | fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16; |
368 | inode->i_mtime.tv_nsec = 0; /* lower 16 bits are not a time */ |
369 | inode->i_ctime = inode->i_mtime; |
370 | inode->i_atime = inode->i_mtime; |
371 | |
372 | befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num); |
373 | befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent); |
374 | befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes); |
375 | befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags); |
376 | |
377 | if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){ |
378 | inode->i_size = 0; |
379 | inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE; |
380 | strncpy(befs_ino->i_data.symlink, raw_inode->data.symlink, |
381 | BEFS_SYMLINK_LEN - 1); |
382 | befs_ino->i_data.symlink[BEFS_SYMLINK_LEN - 1] = '\0'; |
383 | } else { |
384 | int num_blks; |
385 | |
386 | befs_ino->i_data.ds = |
387 | fsds_to_cpu(sb, raw_inode->data.datastream); |
388 | |
389 | num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds); |
390 | inode->i_blocks = |
391 | num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE); |
392 | inode->i_size = befs_ino->i_data.ds.size; |
393 | } |
394 | |
395 | inode->i_mapping->a_ops = &befs_aops; |
396 | |
397 | if (S_ISREG(inode->i_mode)) { |
398 | inode->i_fop = &generic_ro_fops; |
399 | } else if (S_ISDIR(inode->i_mode)) { |
400 | inode->i_op = &befs_dir_inode_operations; |
401 | inode->i_fop = &befs_dir_operations; |
402 | } else if (S_ISLNK(inode->i_mode)) { |
403 | inode->i_op = &befs_symlink_inode_operations; |
404 | } else { |
405 | befs_error(sb, "Inode %lu is not a regular file, " |
406 | "directory or symlink. THAT IS WRONG! BeFS has no " |
407 | "on disk special files", inode->i_ino); |
408 | goto unacquire_bh; |
409 | } |
410 | |
411 | brelse(bh); |
412 | befs_debug(sb, "<--- befs_read_inode()"); |
413 | unlock_new_inode(inode); |
414 | return inode; |
415 | |
416 | unacquire_bh: |
417 | brelse(bh); |
418 | |
419 | unacquire_none: |
420 | iget_failed(inode); |
421 | befs_debug(sb, "<--- befs_read_inode() - Bad inode"); |
422 | return ERR_PTR(ret); |
423 | } |
424 | |
425 | /* Initialize the inode cache. Called at fs setup. |
426 | * |
427 | * Taken from NFS implementation by Al Viro. |
428 | */ |
429 | static int |
430 | befs_init_inodecache(void) |
431 | { |
432 | befs_inode_cachep = kmem_cache_create("befs_inode_cache", |
433 | sizeof (struct befs_inode_info), |
434 | 0, (SLAB_RECLAIM_ACCOUNT| |
435 | SLAB_MEM_SPREAD), |
436 | init_once); |
437 | if (befs_inode_cachep == NULL) { |
438 | printk(KERN_ERR "befs_init_inodecache: " |
439 | "Couldn't initalize inode slabcache\n"); |
440 | return -ENOMEM; |
441 | } |
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 | kmem_cache_destroy(befs_inode_cachep); |
454 | } |
455 | |
456 | /* |
457 | * The inode of symbolic link is different to data stream. |
458 | * The data stream become link name. Unless the LONG_SYMLINK |
459 | * flag is set. |
460 | */ |
461 | static void * |
462 | befs_follow_link(struct dentry *dentry, struct nameidata *nd) |
463 | { |
464 | befs_inode_info *befs_ino = BEFS_I(dentry->d_inode); |
465 | char *link; |
466 | |
467 | if (befs_ino->i_flags & BEFS_LONG_SYMLINK) { |
468 | struct super_block *sb = dentry->d_sb; |
469 | befs_data_stream *data = &befs_ino->i_data.ds; |
470 | befs_off_t len = data->size; |
471 | |
472 | befs_debug(sb, "Follow long symlink"); |
473 | |
474 | link = kmalloc(len, GFP_NOFS); |
475 | if (!link) { |
476 | link = ERR_PTR(-ENOMEM); |
477 | } else if (befs_read_lsymlink(sb, data, link, len) != len) { |
478 | kfree(link); |
479 | befs_error(sb, "Failed to read entire long symlink"); |
480 | link = ERR_PTR(-EIO); |
481 | } else { |
482 | link[len - 1] = '\0'; |
483 | } |
484 | } else { |
485 | link = befs_ino->i_data.symlink; |
486 | } |
487 | |
488 | nd_set_link(nd, link); |
489 | return NULL; |
490 | } |
491 | |
492 | static void befs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) |
493 | { |
494 | befs_inode_info *befs_ino = BEFS_I(dentry->d_inode); |
495 | if (befs_ino->i_flags & BEFS_LONG_SYMLINK) { |
496 | char *link = nd_get_link(nd); |
497 | if (!IS_ERR(link)) |
498 | kfree(link); |
499 | } |
500 | } |
501 | |
502 | /* |
503 | * UTF-8 to NLS charset convert routine |
504 | * |
505 | * |
506 | * Changed 8/10/01 by Will Dyson. Now use uni2char() / char2uni() rather than |
507 | * the nls tables directly |
508 | */ |
509 | |
510 | static int |
511 | befs_utf2nls(struct super_block *sb, const char *in, |
512 | int in_len, char **out, int *out_len) |
513 | { |
514 | struct nls_table *nls = BEFS_SB(sb)->nls; |
515 | int i, o; |
516 | unicode_t uni; |
517 | int unilen, utflen; |
518 | char *result; |
519 | /* The utf8->nls conversion won't make the final nls string bigger |
520 | * than the utf one, but if the string is pure ascii they'll have the |
521 | * same width and an extra char is needed to save the additional \0 |
522 | */ |
523 | int maxlen = in_len + 1; |
524 | |
525 | befs_debug(sb, "---> utf2nls()"); |
526 | |
527 | if (!nls) { |
528 | befs_error(sb, "befs_utf2nls called with no NLS table loaded"); |
529 | return -EINVAL; |
530 | } |
531 | |
532 | *out = result = kmalloc(maxlen, GFP_NOFS); |
533 | if (!*out) { |
534 | befs_error(sb, "befs_utf2nls() cannot allocate memory"); |
535 | *out_len = 0; |
536 | return -ENOMEM; |
537 | } |
538 | |
539 | for (i = o = 0; i < in_len; i += utflen, o += unilen) { |
540 | |
541 | /* convert from UTF-8 to Unicode */ |
542 | utflen = utf8_to_utf32(&in[i], in_len - i, &uni); |
543 | if (utflen < 0) |
544 | goto conv_err; |
545 | |
546 | /* convert from Unicode to nls */ |
547 | if (uni > MAX_WCHAR_T) |
548 | goto conv_err; |
549 | unilen = nls->uni2char(uni, &result[o], in_len - o); |
550 | if (unilen < 0) |
551 | goto conv_err; |
552 | } |
553 | result[o] = '\0'; |
554 | *out_len = o; |
555 | |
556 | befs_debug(sb, "<--- utf2nls()"); |
557 | |
558 | return o; |
559 | |
560 | conv_err: |
561 | befs_error(sb, "Name using character set %s contains a character that " |
562 | "cannot be converted to unicode.", nls->charset); |
563 | befs_debug(sb, "<--- utf2nls()"); |
564 | kfree(result); |
565 | return -EILSEQ; |
566 | } |
567 | |
568 | /** |
569 | * befs_nls2utf - Convert NLS string to utf8 encodeing |
570 | * @sb: Superblock |
571 | * @src: Input string buffer in NLS format |
572 | * @srclen: Length of input string in bytes |
573 | * @dest: The output string in UTF-8 format |
574 | * @destlen: Length of the output buffer |
575 | * |
576 | * Converts input string @src, which is in the format of the loaded NLS map, |
577 | * into a utf8 string. |
578 | * |
579 | * The destination string @dest is allocated by this function and the caller is |
580 | * responsible for freeing it with kfree() |
581 | * |
582 | * On return, *@destlen is the length of @dest in bytes. |
583 | * |
584 | * On success, the return value is the number of utf8 characters written to |
585 | * the output buffer @dest. |
586 | * |
587 | * On Failure, a negative number coresponding to the error code is returned. |
588 | */ |
589 | |
590 | static int |
591 | befs_nls2utf(struct super_block *sb, const char *in, |
592 | int in_len, char **out, int *out_len) |
593 | { |
594 | struct nls_table *nls = BEFS_SB(sb)->nls; |
595 | int i, o; |
596 | wchar_t uni; |
597 | int unilen, utflen; |
598 | char *result; |
599 | /* There're nls characters that will translate to 3-chars-wide UTF-8 |
600 | * characters, a additional byte is needed to save the final \0 |
601 | * in special cases */ |
602 | int maxlen = (3 * in_len) + 1; |
603 | |
604 | befs_debug(sb, "---> nls2utf()\n"); |
605 | |
606 | if (!nls) { |
607 | befs_error(sb, "befs_nls2utf called with no NLS table loaded."); |
608 | return -EINVAL; |
609 | } |
610 | |
611 | *out = result = kmalloc(maxlen, GFP_NOFS); |
612 | if (!*out) { |
613 | befs_error(sb, "befs_nls2utf() cannot allocate memory"); |
614 | *out_len = 0; |
615 | return -ENOMEM; |
616 | } |
617 | |
618 | for (i = o = 0; i < in_len; i += unilen, o += utflen) { |
619 | |
620 | /* convert from nls to unicode */ |
621 | unilen = nls->char2uni(&in[i], in_len - i, &uni); |
622 | if (unilen < 0) |
623 | goto conv_err; |
624 | |
625 | /* convert from unicode to UTF-8 */ |
626 | utflen = utf32_to_utf8(uni, &result[o], 3); |
627 | if (utflen <= 0) |
628 | goto conv_err; |
629 | } |
630 | |
631 | result[o] = '\0'; |
632 | *out_len = o; |
633 | |
634 | befs_debug(sb, "<--- nls2utf()"); |
635 | |
636 | return i; |
637 | |
638 | conv_err: |
639 | befs_error(sb, "Name using charecter set %s contains a charecter that " |
640 | "cannot be converted to unicode.", nls->charset); |
641 | befs_debug(sb, "<--- nls2utf()"); |
642 | kfree(result); |
643 | return -EILSEQ; |
644 | } |
645 | |
646 | /** |
647 | * Use the |
648 | * |
649 | */ |
650 | enum { |
651 | Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err, |
652 | }; |
653 | |
654 | static const match_table_t befs_tokens = { |
655 | {Opt_uid, "uid=%d"}, |
656 | {Opt_gid, "gid=%d"}, |
657 | {Opt_charset, "iocharset=%s"}, |
658 | {Opt_debug, "debug"}, |
659 | {Opt_err, NULL} |
660 | }; |
661 | |
662 | static int |
663 | parse_options(char *options, befs_mount_options * opts) |
664 | { |
665 | char *p; |
666 | substring_t args[MAX_OPT_ARGS]; |
667 | int option; |
668 | |
669 | /* Initialize options */ |
670 | opts->uid = 0; |
671 | opts->gid = 0; |
672 | opts->use_uid = 0; |
673 | opts->use_gid = 0; |
674 | opts->iocharset = NULL; |
675 | opts->debug = 0; |
676 | |
677 | if (!options) |
678 | return 1; |
679 | |
680 | while ((p = strsep(&options, ",")) != NULL) { |
681 | int token; |
682 | if (!*p) |
683 | continue; |
684 | |
685 | token = match_token(p, befs_tokens, args); |
686 | switch (token) { |
687 | case Opt_uid: |
688 | if (match_int(&args[0], &option)) |
689 | return 0; |
690 | if (option < 0) { |
691 | printk(KERN_ERR "BeFS: Invalid uid %d, " |
692 | "using default\n", option); |
693 | break; |
694 | } |
695 | opts->uid = option; |
696 | opts->use_uid = 1; |
697 | break; |
698 | case Opt_gid: |
699 | if (match_int(&args[0], &option)) |
700 | return 0; |
701 | if (option < 0) { |
702 | printk(KERN_ERR "BeFS: Invalid gid %d, " |
703 | "using default\n", option); |
704 | break; |
705 | } |
706 | opts->gid = option; |
707 | opts->use_gid = 1; |
708 | break; |
709 | case Opt_charset: |
710 | kfree(opts->iocharset); |
711 | opts->iocharset = match_strdup(&args[0]); |
712 | if (!opts->iocharset) { |
713 | printk(KERN_ERR "BeFS: allocation failure for " |
714 | "iocharset string\n"); |
715 | return 0; |
716 | } |
717 | break; |
718 | case Opt_debug: |
719 | opts->debug = 1; |
720 | break; |
721 | default: |
722 | printk(KERN_ERR "BeFS: Unrecognized mount option \"%s\" " |
723 | "or missing value\n", p); |
724 | return 0; |
725 | } |
726 | } |
727 | return 1; |
728 | } |
729 | |
730 | /* This function has the responsibiltiy of getting the |
731 | * filesystem ready for unmounting. |
732 | * Basicly, we free everything that we allocated in |
733 | * befs_read_inode |
734 | */ |
735 | static void |
736 | befs_put_super(struct super_block *sb) |
737 | { |
738 | kfree(BEFS_SB(sb)->mount_opts.iocharset); |
739 | BEFS_SB(sb)->mount_opts.iocharset = NULL; |
740 | |
741 | if (BEFS_SB(sb)->nls) { |
742 | unload_nls(BEFS_SB(sb)->nls); |
743 | BEFS_SB(sb)->nls = NULL; |
744 | } |
745 | |
746 | kfree(sb->s_fs_info); |
747 | sb->s_fs_info = NULL; |
748 | } |
749 | |
750 | /* Allocate private field of the superblock, fill it. |
751 | * |
752 | * Finish filling the public superblock fields |
753 | * Make the root directory |
754 | * Load a set of NLS translations if needed. |
755 | */ |
756 | static int |
757 | befs_fill_super(struct super_block *sb, void *data, int silent) |
758 | { |
759 | struct buffer_head *bh; |
760 | befs_sb_info *befs_sb; |
761 | befs_super_block *disk_sb; |
762 | struct inode *root; |
763 | long ret = -EINVAL; |
764 | const unsigned long sb_block = 0; |
765 | const off_t x86_sb_off = 512; |
766 | |
767 | save_mount_options(sb, data); |
768 | |
769 | sb->s_fs_info = kmalloc(sizeof (*befs_sb), GFP_KERNEL); |
770 | if (sb->s_fs_info == NULL) { |
771 | printk(KERN_ERR |
772 | "BeFS(%s): Unable to allocate memory for private " |
773 | "portion of superblock. Bailing.\n", sb->s_id); |
774 | goto unacquire_none; |
775 | } |
776 | befs_sb = BEFS_SB(sb); |
777 | memset(befs_sb, 0, sizeof(befs_sb_info)); |
778 | |
779 | if (!parse_options((char *) data, &befs_sb->mount_opts)) { |
780 | befs_error(sb, "cannot parse mount options"); |
781 | goto unacquire_priv_sbp; |
782 | } |
783 | |
784 | befs_debug(sb, "---> befs_fill_super()"); |
785 | |
786 | #ifndef CONFIG_BEFS_RW |
787 | if (!(sb->s_flags & MS_RDONLY)) { |
788 | befs_warning(sb, |
789 | "No write support. Marking filesystem read-only"); |
790 | sb->s_flags |= MS_RDONLY; |
791 | } |
792 | #endif /* CONFIG_BEFS_RW */ |
793 | |
794 | /* |
795 | * Set dummy blocksize to read super block. |
796 | * Will be set to real fs blocksize later. |
797 | * |
798 | * Linux 2.4.10 and later refuse to read blocks smaller than |
799 | * the hardsect size for the device. But we also need to read at |
800 | * least 1k to get the second 512 bytes of the volume. |
801 | * -WD 10-26-01 |
802 | */ |
803 | sb_min_blocksize(sb, 1024); |
804 | |
805 | if (!(bh = sb_bread(sb, sb_block))) { |
806 | befs_error(sb, "unable to read superblock"); |
807 | goto unacquire_priv_sbp; |
808 | } |
809 | |
810 | /* account for offset of super block on x86 */ |
811 | disk_sb = (befs_super_block *) bh->b_data; |
812 | if ((disk_sb->magic1 == BEFS_SUPER_MAGIC1_LE) || |
813 | (disk_sb->magic1 == BEFS_SUPER_MAGIC1_BE)) { |
814 | befs_debug(sb, "Using PPC superblock location"); |
815 | } else { |
816 | befs_debug(sb, "Using x86 superblock location"); |
817 | disk_sb = |
818 | (befs_super_block *) ((void *) bh->b_data + x86_sb_off); |
819 | } |
820 | |
821 | if (befs_load_sb(sb, disk_sb) != BEFS_OK) |
822 | goto unacquire_bh; |
823 | |
824 | befs_dump_super_block(sb, disk_sb); |
825 | |
826 | brelse(bh); |
827 | |
828 | if (befs_check_sb(sb) != BEFS_OK) |
829 | goto unacquire_priv_sbp; |
830 | |
831 | if( befs_sb->num_blocks > ~((sector_t)0) ) { |
832 | befs_error(sb, "blocks count: %Lu " |
833 | "is larger than the host can use", |
834 | befs_sb->num_blocks); |
835 | goto unacquire_priv_sbp; |
836 | } |
837 | |
838 | /* |
839 | * set up enough so that it can read an inode |
840 | * Fill in kernel superblock fields from private sb |
841 | */ |
842 | sb->s_magic = BEFS_SUPER_MAGIC; |
843 | /* Set real blocksize of fs */ |
844 | sb_set_blocksize(sb, (ulong) befs_sb->block_size); |
845 | sb->s_op = (struct super_operations *) &befs_sops; |
846 | root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir))); |
847 | if (IS_ERR(root)) { |
848 | ret = PTR_ERR(root); |
849 | goto unacquire_priv_sbp; |
850 | } |
851 | sb->s_root = d_alloc_root(root); |
852 | if (!sb->s_root) { |
853 | iput(root); |
854 | befs_error(sb, "get root inode failed"); |
855 | goto unacquire_priv_sbp; |
856 | } |
857 | |
858 | /* load nls library */ |
859 | if (befs_sb->mount_opts.iocharset) { |
860 | befs_debug(sb, "Loading nls: %s", |
861 | befs_sb->mount_opts.iocharset); |
862 | befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset); |
863 | if (!befs_sb->nls) { |
864 | befs_warning(sb, "Cannot load nls %s" |
865 | " loading default nls", |
866 | befs_sb->mount_opts.iocharset); |
867 | befs_sb->nls = load_nls_default(); |
868 | } |
869 | /* load default nls if none is specified in mount options */ |
870 | } else { |
871 | befs_debug(sb, "Loading default nls"); |
872 | befs_sb->nls = load_nls_default(); |
873 | } |
874 | |
875 | return 0; |
876 | /*****************/ |
877 | unacquire_bh: |
878 | brelse(bh); |
879 | |
880 | unacquire_priv_sbp: |
881 | kfree(sb->s_fs_info); |
882 | |
883 | unacquire_none: |
884 | sb->s_fs_info = NULL; |
885 | return ret; |
886 | } |
887 | |
888 | static int |
889 | befs_remount(struct super_block *sb, int *flags, char *data) |
890 | { |
891 | if (!(*flags & MS_RDONLY)) |
892 | return -EINVAL; |
893 | return 0; |
894 | } |
895 | |
896 | static int |
897 | befs_statfs(struct dentry *dentry, struct kstatfs *buf) |
898 | { |
899 | struct super_block *sb = dentry->d_sb; |
900 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
901 | |
902 | befs_debug(sb, "---> befs_statfs()"); |
903 | |
904 | buf->f_type = BEFS_SUPER_MAGIC; |
905 | buf->f_bsize = sb->s_blocksize; |
906 | buf->f_blocks = BEFS_SB(sb)->num_blocks; |
907 | buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks; |
908 | buf->f_bavail = buf->f_bfree; |
909 | buf->f_files = 0; /* UNKNOWN */ |
910 | buf->f_ffree = 0; /* UNKNOWN */ |
911 | buf->f_fsid.val[0] = (u32)id; |
912 | buf->f_fsid.val[1] = (u32)(id >> 32); |
913 | buf->f_namelen = BEFS_NAME_LEN; |
914 | |
915 | befs_debug(sb, "<--- befs_statfs()"); |
916 | |
917 | return 0; |
918 | } |
919 | |
920 | static int |
921 | befs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, |
922 | void *data, struct vfsmount *mnt) |
923 | { |
924 | return get_sb_bdev(fs_type, flags, dev_name, data, befs_fill_super, |
925 | mnt); |
926 | } |
927 | |
928 | static struct file_system_type befs_fs_type = { |
929 | .owner = THIS_MODULE, |
930 | .name = "befs", |
931 | .get_sb = befs_get_sb, |
932 | .kill_sb = kill_block_super, |
933 | .fs_flags = FS_REQUIRES_DEV, |
934 | }; |
935 | |
936 | static int __init |
937 | init_befs_fs(void) |
938 | { |
939 | int err; |
940 | |
941 | printk(KERN_INFO "BeFS version: %s\n", BEFS_VERSION); |
942 | |
943 | err = befs_init_inodecache(); |
944 | if (err) |
945 | goto unacquire_none; |
946 | |
947 | err = register_filesystem(&befs_fs_type); |
948 | if (err) |
949 | goto unacquire_inodecache; |
950 | |
951 | return 0; |
952 | |
953 | unacquire_inodecache: |
954 | befs_destroy_inodecache(); |
955 | |
956 | unacquire_none: |
957 | return err; |
958 | } |
959 | |
960 | static void __exit |
961 | exit_befs_fs(void) |
962 | { |
963 | befs_destroy_inodecache(); |
964 | |
965 | unregister_filesystem(&befs_fs_type); |
966 | } |
967 | |
968 | /* |
969 | Macros that typecheck the init and exit functions, |
970 | ensures that they are called at init and cleanup, |
971 | and eliminates warnings about unused functions. |
972 | */ |
973 | module_init(init_befs_fs) |
974 | module_exit(exit_befs_fs) |
975 |
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