Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/befs/linuxvfs.c | |
3 | * | |
4 | * Copyright (C) 2001 Will Dyson <will_dyson@pobox.com | |
5 | * | |
6 | */ | |
7 | ||
dac52fc1 FF |
8 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
9 | ||
1da177e4 LT |
10 | #include <linux/module.h> |
11 | #include <linux/slab.h> | |
12 | #include <linux/fs.h> | |
13 | #include <linux/errno.h> | |
14 | #include <linux/stat.h> | |
15 | #include <linux/nls.h> | |
16 | #include <linux/buffer_head.h> | |
17 | #include <linux/vfs.h> | |
18 | #include <linux/parser.h> | |
19 | #include <linux/namei.h> | |
31aba059 | 20 | #include <linux/sched.h> |
1da177e4 LT |
21 | |
22 | #include "befs.h" | |
23 | #include "btree.h" | |
24 | #include "inode.h" | |
25 | #include "datastream.h" | |
26 | #include "super.h" | |
27 | #include "io.h" | |
1da177e4 LT |
28 | |
29 | MODULE_DESCRIPTION("BeOS File System (BeFS) driver"); | |
30 | MODULE_AUTHOR("Will Dyson"); | |
31 | MODULE_LICENSE("GPL"); | |
32 | ||
33 | /* The units the vfs expects inode->i_blocks to be in */ | |
34 | #define VFS_BLOCK_SIZE 512 | |
35 | ||
f0f49ef5 | 36 | static int befs_readdir(struct file *, struct dir_context *); |
1da177e4 LT |
37 | static int befs_get_block(struct inode *, sector_t, struct buffer_head *, int); |
38 | static int befs_readpage(struct file *file, struct page *page); | |
39 | static sector_t befs_bmap(struct address_space *mapping, sector_t block); | |
00cd8dd3 | 40 | static struct dentry *befs_lookup(struct inode *, struct dentry *, unsigned int); |
96eb5419 | 41 | static struct inode *befs_iget(struct super_block *, unsigned long); |
1da177e4 LT |
42 | static struct inode *befs_alloc_inode(struct super_block *sb); |
43 | static void befs_destroy_inode(struct inode *inode); | |
1da177e4 | 44 | static void befs_destroy_inodecache(void); |
680baacb | 45 | static const char *befs_follow_link(struct dentry *, void **, struct nameidata *nd); |
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 *); |
09ad0eae | 53 | static int parse_options(char *, struct befs_mount_options *); |
1da177e4 LT |
54 | |
55 | static const struct super_operations befs_sops = { | |
1da177e4 LT |
56 | .alloc_inode = befs_alloc_inode, /* allocate a new inode */ |
57 | .destroy_inode = befs_destroy_inode, /* deallocate an inode */ | |
58 | .put_super = befs_put_super, /* uninit super */ | |
59 | .statfs = befs_statfs, /* statfs */ | |
60 | .remount_fs = befs_remount, | |
552c3c6c | 61 | .show_options = generic_show_options, |
1da177e4 LT |
62 | }; |
63 | ||
64 | /* slab cache for befs_inode_info objects */ | |
e18b890b | 65 | static struct kmem_cache *befs_inode_cachep; |
1da177e4 | 66 | |
4b6f5d20 | 67 | static const struct file_operations befs_dir_operations = { |
1da177e4 | 68 | .read = generic_read_dir, |
f0f49ef5 | 69 | .iterate = befs_readdir, |
59af1584 | 70 | .llseek = generic_file_llseek, |
1da177e4 LT |
71 | }; |
72 | ||
754661f1 | 73 | static const struct inode_operations befs_dir_inode_operations = { |
1da177e4 LT |
74 | .lookup = befs_lookup, |
75 | }; | |
76 | ||
f5e54d6e | 77 | static const struct address_space_operations befs_aops = { |
1da177e4 | 78 | .readpage = befs_readpage, |
1da177e4 LT |
79 | .bmap = befs_bmap, |
80 | }; | |
81 | ||
754661f1 | 82 | static const struct inode_operations befs_symlink_inode_operations = { |
1da177e4 LT |
83 | .readlink = generic_readlink, |
84 | .follow_link = befs_follow_link, | |
48bc06e7 | 85 | .put_link = kfree_put_link, |
1da177e4 LT |
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", | |
dac52fc1 | 129 | (unsigned long)inode->i_ino, (long)block); |
1da177e4 LT |
130 | if (create) { |
131 | befs_error(sb, "befs_get_block() was asked to write to " | |
dac52fc1 FF |
132 | "block %ld in inode %lu", (long)block, |
133 | (unsigned long)inode->i_ino); | |
1da177e4 LT |
134 | return -EPERM; |
135 | } | |
136 | ||
137 | res = befs_fblock2brun(sb, ds, block, &run); | |
138 | if (res != BEFS_OK) { | |
139 | befs_error(sb, | |
dac52fc1 FF |
140 | "<--- %s for inode %lu, block %ld ERROR", |
141 | __func__, (unsigned long)inode->i_ino, | |
142 | (long)block); | |
1da177e4 LT |
143 | return -EFBIG; |
144 | } | |
145 | ||
146 | disk_off = (ulong) iaddr2blockno(sb, &run); | |
147 | ||
148 | map_bh(bh_result, inode->i_sb, disk_off); | |
149 | ||
dac52fc1 FF |
150 | befs_debug(sb, "<--- %s for inode %lu, block %ld, disk address %lu", |
151 | __func__, (unsigned long)inode->i_ino, (long)block, | |
152 | (unsigned long)disk_off); | |
1da177e4 LT |
153 | |
154 | return 0; | |
155 | } | |
156 | ||
157 | static struct dentry * | |
00cd8dd3 | 158 | befs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) |
1da177e4 LT |
159 | { |
160 | struct inode *inode = NULL; | |
161 | struct super_block *sb = dir->i_sb; | |
162 | befs_data_stream *ds = &BEFS_I(dir)->i_data.ds; | |
163 | befs_off_t offset; | |
164 | int ret; | |
165 | int utfnamelen; | |
166 | char *utfname; | |
167 | const char *name = dentry->d_name.name; | |
168 | ||
a455589f AV |
169 | befs_debug(sb, "---> %s name %pd inode %ld", __func__, |
170 | dentry, dir->i_ino); | |
1da177e4 LT |
171 | |
172 | /* Convert to UTF-8 */ | |
173 | if (BEFS_SB(sb)->nls) { | |
174 | ret = | |
175 | befs_nls2utf(sb, name, strlen(name), &utfname, &utfnamelen); | |
176 | if (ret < 0) { | |
dac52fc1 | 177 | befs_debug(sb, "<--- %s ERROR", __func__); |
1da177e4 LT |
178 | return ERR_PTR(ret); |
179 | } | |
180 | ret = befs_btree_find(sb, ds, utfname, &offset); | |
181 | kfree(utfname); | |
182 | ||
183 | } else { | |
184 | ret = befs_btree_find(sb, ds, dentry->d_name.name, &offset); | |
185 | } | |
186 | ||
187 | if (ret == BEFS_BT_NOT_FOUND) { | |
a455589f | 188 | befs_debug(sb, "<--- %s %pd not found", __func__, dentry); |
1da177e4 LT |
189 | return ERR_PTR(-ENOENT); |
190 | ||
191 | } else if (ret != BEFS_OK || offset == 0) { | |
dac52fc1 | 192 | befs_warning(sb, "<--- %s Error", __func__); |
1da177e4 LT |
193 | return ERR_PTR(-ENODATA); |
194 | } | |
195 | ||
96eb5419 DH |
196 | inode = befs_iget(dir->i_sb, (ino_t) offset); |
197 | if (IS_ERR(inode)) | |
198 | return ERR_CAST(inode); | |
1da177e4 LT |
199 | |
200 | d_add(dentry, inode); | |
201 | ||
dac52fc1 | 202 | befs_debug(sb, "<--- %s", __func__); |
1da177e4 LT |
203 | |
204 | return NULL; | |
205 | } | |
206 | ||
207 | static int | |
f0f49ef5 | 208 | befs_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 209 | { |
f0f49ef5 | 210 | struct inode *inode = file_inode(file); |
1da177e4 LT |
211 | struct super_block *sb = inode->i_sb; |
212 | befs_data_stream *ds = &BEFS_I(inode)->i_data.ds; | |
213 | befs_off_t value; | |
214 | int result; | |
215 | size_t keysize; | |
216 | unsigned char d_type; | |
217 | char keybuf[BEFS_NAME_LEN + 1]; | |
1da177e4 | 218 | |
a455589f AV |
219 | befs_debug(sb, "---> %s name %pD, inode %ld, ctx->pos %lld", |
220 | __func__, file, inode->i_ino, ctx->pos); | |
1da177e4 | 221 | |
f0f49ef5 AV |
222 | more: |
223 | result = befs_btree_read(sb, ds, ctx->pos, BEFS_NAME_LEN + 1, | |
1da177e4 LT |
224 | keybuf, &keysize, &value); |
225 | ||
226 | if (result == BEFS_ERR) { | |
dac52fc1 | 227 | befs_debug(sb, "<--- %s ERROR", __func__); |
a455589f AV |
228 | befs_error(sb, "IO error reading %pD (inode %lu)", |
229 | file, inode->i_ino); | |
1da177e4 LT |
230 | return -EIO; |
231 | ||
232 | } else if (result == BEFS_BT_END) { | |
dac52fc1 | 233 | befs_debug(sb, "<--- %s END", __func__); |
1da177e4 LT |
234 | return 0; |
235 | ||
236 | } else if (result == BEFS_BT_EMPTY) { | |
dac52fc1 | 237 | befs_debug(sb, "<--- %s Empty directory", __func__); |
1da177e4 LT |
238 | return 0; |
239 | } | |
240 | ||
241 | d_type = DT_UNKNOWN; | |
242 | ||
243 | /* Convert to NLS */ | |
244 | if (BEFS_SB(sb)->nls) { | |
f0f49ef5 AV |
245 | char *nlsname; |
246 | int nlsnamelen; | |
1da177e4 LT |
247 | result = |
248 | befs_utf2nls(sb, keybuf, keysize, &nlsname, &nlsnamelen); | |
249 | if (result < 0) { | |
dac52fc1 | 250 | befs_debug(sb, "<--- %s ERROR", __func__); |
1da177e4 LT |
251 | return result; |
252 | } | |
f0f49ef5 AV |
253 | if (!dir_emit(ctx, nlsname, nlsnamelen, |
254 | (ino_t) value, d_type)) { | |
255 | kfree(nlsname); | |
256 | return 0; | |
257 | } | |
1da177e4 | 258 | kfree(nlsname); |
1da177e4 | 259 | } else { |
f0f49ef5 AV |
260 | if (!dir_emit(ctx, keybuf, keysize, |
261 | (ino_t) value, d_type)) | |
262 | return 0; | |
1da177e4 | 263 | } |
f0f49ef5 AV |
264 | ctx->pos++; |
265 | goto more; | |
1da177e4 LT |
266 | } |
267 | ||
268 | static struct inode * | |
269 | befs_alloc_inode(struct super_block *sb) | |
270 | { | |
111d639d FF |
271 | struct befs_inode_info *bi; |
272 | ||
273 | bi = kmem_cache_alloc(befs_inode_cachep, GFP_KERNEL); | |
1da177e4 LT |
274 | if (!bi) |
275 | return NULL; | |
276 | return &bi->vfs_inode; | |
277 | } | |
278 | ||
fa0d7e3d | 279 | static void befs_i_callback(struct rcu_head *head) |
1da177e4 | 280 | { |
fa0d7e3d | 281 | struct inode *inode = container_of(head, struct inode, i_rcu); |
1da177e4 LT |
282 | kmem_cache_free(befs_inode_cachep, BEFS_I(inode)); |
283 | } | |
284 | ||
fa0d7e3d NP |
285 | static void befs_destroy_inode(struct inode *inode) |
286 | { | |
287 | call_rcu(&inode->i_rcu, befs_i_callback); | |
288 | } | |
289 | ||
51cc5068 | 290 | static void init_once(void *foo) |
1da177e4 LT |
291 | { |
292 | struct befs_inode_info *bi = (struct befs_inode_info *) foo; | |
a35afb83 CL |
293 | |
294 | inode_init_once(&bi->vfs_inode); | |
1da177e4 LT |
295 | } |
296 | ||
96eb5419 | 297 | static struct inode *befs_iget(struct super_block *sb, unsigned long ino) |
1da177e4 LT |
298 | { |
299 | struct buffer_head *bh = NULL; | |
300 | befs_inode *raw_inode = NULL; | |
038428fc | 301 | struct befs_sb_info *befs_sb = BEFS_SB(sb); |
f8ccad21 | 302 | struct befs_inode_info *befs_ino = NULL; |
96eb5419 DH |
303 | struct inode *inode; |
304 | long ret = -EIO; | |
1da177e4 | 305 | |
dac52fc1 | 306 | befs_debug(sb, "---> %s inode = %lu", __func__, ino); |
96eb5419 DH |
307 | |
308 | inode = iget_locked(sb, ino); | |
ac34a1b3 RP |
309 | if (!inode) |
310 | return ERR_PTR(-ENOMEM); | |
96eb5419 DH |
311 | if (!(inode->i_state & I_NEW)) |
312 | return inode; | |
1da177e4 LT |
313 | |
314 | befs_ino = BEFS_I(inode); | |
315 | ||
316 | /* convert from vfs's inode number to befs's inode number */ | |
317 | befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino); | |
318 | ||
319 | befs_debug(sb, " real inode number [%u, %hu, %hu]", | |
320 | befs_ino->i_inode_num.allocation_group, | |
321 | befs_ino->i_inode_num.start, befs_ino->i_inode_num.len); | |
322 | ||
323 | bh = befs_bread(sb, inode->i_ino); | |
324 | if (!bh) { | |
325 | befs_error(sb, "unable to read inode block - " | |
326 | "inode = %lu", inode->i_ino); | |
0418726b | 327 | goto unacquire_none; |
1da177e4 LT |
328 | } |
329 | ||
330 | raw_inode = (befs_inode *) bh->b_data; | |
331 | ||
332 | befs_dump_inode(sb, raw_inode); | |
333 | ||
334 | if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) { | |
335 | befs_error(sb, "Bad inode: %lu", inode->i_ino); | |
0418726b | 336 | goto unacquire_bh; |
1da177e4 LT |
337 | } |
338 | ||
339 | inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode); | |
340 | ||
341 | /* | |
342 | * set uid and gid. But since current BeOS is single user OS, so | |
343 | * you can change by "uid" or "gid" options. | |
344 | */ | |
345 | ||
346 | inode->i_uid = befs_sb->mount_opts.use_uid ? | |
31aba059 EB |
347 | befs_sb->mount_opts.uid : |
348 | make_kuid(&init_user_ns, fs32_to_cpu(sb, raw_inode->uid)); | |
1da177e4 | 349 | inode->i_gid = befs_sb->mount_opts.use_gid ? |
31aba059 EB |
350 | befs_sb->mount_opts.gid : |
351 | make_kgid(&init_user_ns, fs32_to_cpu(sb, raw_inode->gid)); | |
1da177e4 | 352 | |
bfe86848 | 353 | set_nlink(inode, 1); |
1da177e4 LT |
354 | |
355 | /* | |
356 | * BEFS's time is 64 bits, but current VFS is 32 bits... | |
357 | * BEFS don't have access time. Nor inode change time. VFS | |
358 | * doesn't have creation time. | |
359 | * Also, the lower 16 bits of the last_modified_time and | |
360 | * create_time are just a counter to help ensure uniqueness | |
361 | * for indexing purposes. (PFD, page 54) | |
362 | */ | |
363 | ||
364 | inode->i_mtime.tv_sec = | |
365 | fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16; | |
366 | inode->i_mtime.tv_nsec = 0; /* lower 16 bits are not a time */ | |
367 | inode->i_ctime = inode->i_mtime; | |
368 | inode->i_atime = inode->i_mtime; | |
1da177e4 LT |
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; | |
39d7a29f FF |
378 | strlcpy(befs_ino->i_data.symlink, raw_inode->data.symlink, |
379 | BEFS_SYMLINK_LEN); | |
1da177e4 LT |
380 | } else { |
381 | int num_blks; | |
382 | ||
383 | befs_ino->i_data.ds = | |
e0e3d32b | 384 | fsds_to_cpu(sb, &raw_inode->data.datastream); |
1da177e4 LT |
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)) { | |
d0deec19 | 400 | if (befs_ino->i_flags & BEFS_LONG_SYMLINK) { |
48bc06e7 | 401 | inode->i_op = &befs_symlink_inode_operations; |
d0deec19 AV |
402 | } else { |
403 | inode->i_link = befs_ino->i_data.symlink; | |
404 | inode->i_op = &simple_symlink_inode_operations; | |
405 | } | |
1da177e4 LT |
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); | |
0418726b | 410 | goto unacquire_bh; |
1da177e4 LT |
411 | } |
412 | ||
413 | brelse(bh); | |
dac52fc1 | 414 | befs_debug(sb, "<--- %s", __func__); |
96eb5419 DH |
415 | unlock_new_inode(inode); |
416 | return inode; | |
1da177e4 | 417 | |
0418726b | 418 | unacquire_bh: |
1da177e4 LT |
419 | brelse(bh); |
420 | ||
0418726b | 421 | unacquire_none: |
96eb5419 | 422 | iget_failed(inode); |
dac52fc1 | 423 | befs_debug(sb, "<--- %s - Bad inode", __func__); |
96eb5419 | 424 | return ERR_PTR(ret); |
1da177e4 LT |
425 | } |
426 | ||
427 | /* Initialize the inode cache. Called at fs setup. | |
20c2df83 | 428 | * |
1da177e4 LT |
429 | * Taken from NFS implementation by Al Viro. |
430 | */ | |
91a52ab7 | 431 | static int __init |
1da177e4 LT |
432 | befs_init_inodecache(void) |
433 | { | |
434 | befs_inode_cachep = kmem_cache_create("befs_inode_cache", | |
435 | sizeof (struct befs_inode_info), | |
fffb60f9 PJ |
436 | 0, (SLAB_RECLAIM_ACCOUNT| |
437 | SLAB_MEM_SPREAD), | |
20c2df83 | 438 | init_once); |
1da177e4 | 439 | if (befs_inode_cachep == NULL) { |
dac52fc1 | 440 | pr_err("%s: Couldn't initialize inode slabcache\n", __func__); |
1da177e4 LT |
441 | return -ENOMEM; |
442 | } | |
1da177e4 LT |
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 | { | |
8c0a8537 KS |
453 | /* |
454 | * Make sure all delayed rcu free inodes are flushed before we | |
455 | * destroy cache. | |
456 | */ | |
457 | rcu_barrier(); | |
1a1d92c1 | 458 | kmem_cache_destroy(befs_inode_cachep); |
1da177e4 LT |
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 | */ | |
680baacb AV |
466 | static const char * |
467 | befs_follow_link(struct dentry *dentry, void **cookie, struct nameidata *nd) | |
1da177e4 | 468 | { |
48bc06e7 | 469 | struct super_block *sb = dentry->d_sb; |
9ec3a646 | 470 | struct befs_inode_info *befs_ino = BEFS_I(d_inode(dentry)); |
48bc06e7 AV |
471 | befs_data_stream *data = &befs_ino->i_data.ds; |
472 | befs_off_t len = data->size; | |
1da177e4 LT |
473 | char *link; |
474 | ||
48bc06e7 AV |
475 | if (len == 0) { |
476 | befs_error(sb, "Long symlink with illegal length"); | |
680baacb | 477 | return ERR_PTR(-EIO); |
1da177e4 | 478 | } |
680baacb AV |
479 | befs_debug(sb, "Follow long symlink"); |
480 | ||
481 | link = kmalloc(len, GFP_NOFS); | |
482 | if (!link) | |
483 | return ERR_PTR(-ENOMEM); | |
484 | if (befs_read_lsymlink(sb, data, link, len) != len) { | |
485 | kfree(link); | |
486 | befs_error(sb, "Failed to read entire long symlink"); | |
487 | return ERR_PTR(-EIO); | |
488 | } | |
489 | link[len - 1] = '\0'; | |
490 | return *cookie = link; | |
1da177e4 LT |
491 | } |
492 | ||
1da177e4 LT |
493 | /* |
494 | * UTF-8 to NLS charset convert routine | |
495 | * | |
496 | * | |
497 | * Changed 8/10/01 by Will Dyson. Now use uni2char() / char2uni() rather than | |
498 | * the nls tables directly | |
499 | */ | |
500 | ||
501 | static int | |
502 | befs_utf2nls(struct super_block *sb, const char *in, | |
503 | int in_len, char **out, int *out_len) | |
504 | { | |
505 | struct nls_table *nls = BEFS_SB(sb)->nls; | |
506 | int i, o; | |
74675a58 | 507 | unicode_t uni; |
1da177e4 LT |
508 | int unilen, utflen; |
509 | char *result; | |
94f563c4 DC |
510 | /* The utf8->nls conversion won't make the final nls string bigger |
511 | * than the utf one, but if the string is pure ascii they'll have the | |
512 | * same width and an extra char is needed to save the additional \0 | |
513 | */ | |
514 | int maxlen = in_len + 1; | |
1da177e4 | 515 | |
dac52fc1 | 516 | befs_debug(sb, "---> %s", __func__); |
1da177e4 LT |
517 | |
518 | if (!nls) { | |
dac52fc1 | 519 | befs_error(sb, "%s called with no NLS table loaded", __func__); |
1da177e4 LT |
520 | return -EINVAL; |
521 | } | |
522 | ||
523 | *out = result = kmalloc(maxlen, GFP_NOFS); | |
524 | if (!*out) { | |
dac52fc1 | 525 | befs_error(sb, "%s cannot allocate memory", __func__); |
1da177e4 LT |
526 | *out_len = 0; |
527 | return -ENOMEM; | |
528 | } | |
529 | ||
530 | for (i = o = 0; i < in_len; i += utflen, o += unilen) { | |
531 | ||
532 | /* convert from UTF-8 to Unicode */ | |
74675a58 AS |
533 | utflen = utf8_to_utf32(&in[i], in_len - i, &uni); |
534 | if (utflen < 0) | |
1da177e4 | 535 | goto conv_err; |
1da177e4 LT |
536 | |
537 | /* convert from Unicode to nls */ | |
74675a58 AS |
538 | if (uni > MAX_WCHAR_T) |
539 | goto conv_err; | |
1da177e4 | 540 | unilen = nls->uni2char(uni, &result[o], in_len - o); |
74675a58 | 541 | if (unilen < 0) |
1da177e4 | 542 | goto conv_err; |
1da177e4 LT |
543 | } |
544 | result[o] = '\0'; | |
545 | *out_len = o; | |
546 | ||
dac52fc1 | 547 | befs_debug(sb, "<--- %s", __func__); |
1da177e4 LT |
548 | |
549 | return o; | |
550 | ||
551 | conv_err: | |
552 | befs_error(sb, "Name using character set %s contains a character that " | |
553 | "cannot be converted to unicode.", nls->charset); | |
dac52fc1 | 554 | befs_debug(sb, "<--- %s", __func__); |
1da177e4 LT |
555 | kfree(result); |
556 | return -EILSEQ; | |
557 | } | |
558 | ||
559 | /** | |
560 | * befs_nls2utf - Convert NLS string to utf8 encodeing | |
561 | * @sb: Superblock | |
817e1d90 FF |
562 | * @in: Input string buffer in NLS format |
563 | * @in_len: Length of input string in bytes | |
564 | * @out: The output string in UTF-8 format | |
565 | * @out_len: Length of the output buffer | |
1da177e4 | 566 | * |
817e1d90 | 567 | * Converts input string @in, which is in the format of the loaded NLS map, |
1da177e4 LT |
568 | * into a utf8 string. |
569 | * | |
817e1d90 | 570 | * The destination string @out is allocated by this function and the caller is |
1da177e4 LT |
571 | * responsible for freeing it with kfree() |
572 | * | |
817e1d90 | 573 | * On return, *@out_len is the length of @out in bytes. |
1da177e4 LT |
574 | * |
575 | * On success, the return value is the number of utf8 characters written to | |
817e1d90 | 576 | * the output buffer @out. |
1da177e4 LT |
577 | * |
578 | * On Failure, a negative number coresponding to the error code is returned. | |
579 | */ | |
580 | ||
581 | static int | |
582 | befs_nls2utf(struct super_block *sb, const char *in, | |
583 | int in_len, char **out, int *out_len) | |
584 | { | |
585 | struct nls_table *nls = BEFS_SB(sb)->nls; | |
586 | int i, o; | |
587 | wchar_t uni; | |
588 | int unilen, utflen; | |
589 | char *result; | |
94f563c4 DC |
590 | /* There're nls characters that will translate to 3-chars-wide UTF-8 |
591 | * characters, a additional byte is needed to save the final \0 | |
592 | * in special cases */ | |
593 | int maxlen = (3 * in_len) + 1; | |
1da177e4 | 594 | |
dac52fc1 | 595 | befs_debug(sb, "---> %s\n", __func__); |
1da177e4 LT |
596 | |
597 | if (!nls) { | |
dac52fc1 FF |
598 | befs_error(sb, "%s called with no NLS table loaded.", |
599 | __func__); | |
1da177e4 LT |
600 | return -EINVAL; |
601 | } | |
602 | ||
603 | *out = result = kmalloc(maxlen, GFP_NOFS); | |
604 | if (!*out) { | |
dac52fc1 | 605 | befs_error(sb, "%s cannot allocate memory", __func__); |
1da177e4 LT |
606 | *out_len = 0; |
607 | return -ENOMEM; | |
608 | } | |
609 | ||
610 | for (i = o = 0; i < in_len; i += unilen, o += utflen) { | |
611 | ||
612 | /* convert from nls to unicode */ | |
613 | unilen = nls->char2uni(&in[i], in_len - i, &uni); | |
74675a58 | 614 | if (unilen < 0) |
1da177e4 | 615 | goto conv_err; |
1da177e4 LT |
616 | |
617 | /* convert from unicode to UTF-8 */ | |
74675a58 AS |
618 | utflen = utf32_to_utf8(uni, &result[o], 3); |
619 | if (utflen <= 0) | |
1da177e4 | 620 | goto conv_err; |
1da177e4 LT |
621 | } |
622 | ||
623 | result[o] = '\0'; | |
624 | *out_len = o; | |
625 | ||
dac52fc1 | 626 | befs_debug(sb, "<--- %s", __func__); |
1da177e4 LT |
627 | |
628 | return i; | |
629 | ||
630 | conv_err: | |
631 | befs_error(sb, "Name using charecter set %s contains a charecter that " | |
632 | "cannot be converted to unicode.", nls->charset); | |
dac52fc1 | 633 | befs_debug(sb, "<--- %s", __func__); |
1da177e4 LT |
634 | kfree(result); |
635 | return -EILSEQ; | |
636 | } | |
637 | ||
638 | /** | |
639 | * Use the | |
640 | * | |
641 | */ | |
642 | enum { | |
643 | Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err, | |
644 | }; | |
645 | ||
a447c093 | 646 | static const match_table_t befs_tokens = { |
1da177e4 LT |
647 | {Opt_uid, "uid=%d"}, |
648 | {Opt_gid, "gid=%d"}, | |
649 | {Opt_charset, "iocharset=%s"}, | |
650 | {Opt_debug, "debug"}, | |
651 | {Opt_err, NULL} | |
652 | }; | |
653 | ||
654 | static int | |
09ad0eae | 655 | parse_options(char *options, struct befs_mount_options *opts) |
1da177e4 LT |
656 | { |
657 | char *p; | |
658 | substring_t args[MAX_OPT_ARGS]; | |
659 | int option; | |
31aba059 EB |
660 | kuid_t uid; |
661 | kgid_t gid; | |
1da177e4 LT |
662 | |
663 | /* Initialize options */ | |
31aba059 EB |
664 | opts->uid = GLOBAL_ROOT_UID; |
665 | opts->gid = GLOBAL_ROOT_GID; | |
1da177e4 LT |
666 | opts->use_uid = 0; |
667 | opts->use_gid = 0; | |
668 | opts->iocharset = NULL; | |
669 | opts->debug = 0; | |
670 | ||
671 | if (!options) | |
672 | return 1; | |
673 | ||
674 | while ((p = strsep(&options, ",")) != NULL) { | |
675 | int token; | |
676 | if (!*p) | |
677 | continue; | |
678 | ||
679 | token = match_token(p, befs_tokens, args); | |
680 | switch (token) { | |
681 | case Opt_uid: | |
682 | if (match_int(&args[0], &option)) | |
683 | return 0; | |
31aba059 EB |
684 | uid = INVALID_UID; |
685 | if (option >= 0) | |
686 | uid = make_kuid(current_user_ns(), option); | |
687 | if (!uid_valid(uid)) { | |
dac52fc1 FF |
688 | pr_err("Invalid uid %d, " |
689 | "using default\n", option); | |
1da177e4 LT |
690 | break; |
691 | } | |
31aba059 | 692 | opts->uid = uid; |
1da177e4 LT |
693 | opts->use_uid = 1; |
694 | break; | |
695 | case Opt_gid: | |
696 | if (match_int(&args[0], &option)) | |
697 | return 0; | |
31aba059 EB |
698 | gid = INVALID_GID; |
699 | if (option >= 0) | |
700 | gid = make_kgid(current_user_ns(), option); | |
701 | if (!gid_valid(gid)) { | |
dac52fc1 FF |
702 | pr_err("Invalid gid %d, " |
703 | "using default\n", option); | |
1da177e4 LT |
704 | break; |
705 | } | |
31aba059 | 706 | opts->gid = gid; |
1da177e4 LT |
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) { | |
dac52fc1 FF |
713 | pr_err("allocation failure for " |
714 | "iocharset string\n"); | |
1da177e4 LT |
715 | return 0; |
716 | } | |
717 | break; | |
718 | case Opt_debug: | |
719 | opts->debug = 1; | |
720 | break; | |
721 | default: | |
dac52fc1 FF |
722 | pr_err("Unrecognized mount option \"%s\" " |
723 | "or missing value\n", p); | |
1da177e4 LT |
724 | return 0; |
725 | } | |
726 | } | |
727 | return 1; | |
728 | } | |
729 | ||
730 | /* This function has the responsibiltiy of getting the | |
731 | * filesystem ready for unmounting. | |
25985edc | 732 | * Basically, we free everything that we allocated in |
1da177e4 LT |
733 | * befs_read_inode |
734 | */ | |
735 | static void | |
736 | befs_put_super(struct super_block *sb) | |
737 | { | |
f99d49ad JJ |
738 | kfree(BEFS_SB(sb)->mount_opts.iocharset); |
739 | BEFS_SB(sb)->mount_opts.iocharset = NULL; | |
6d729e44 | 740 | unload_nls(BEFS_SB(sb)->nls); |
f99d49ad JJ |
741 | kfree(sb->s_fs_info); |
742 | sb->s_fs_info = NULL; | |
1da177e4 LT |
743 | } |
744 | ||
745 | /* Allocate private field of the superblock, fill it. | |
746 | * | |
747 | * Finish filling the public superblock fields | |
748 | * Make the root directory | |
749 | * Load a set of NLS translations if needed. | |
750 | */ | |
751 | static int | |
752 | befs_fill_super(struct super_block *sb, void *data, int silent) | |
753 | { | |
754 | struct buffer_head *bh; | |
038428fc | 755 | struct befs_sb_info *befs_sb; |
1da177e4 LT |
756 | befs_super_block *disk_sb; |
757 | struct inode *root; | |
96eb5419 | 758 | long ret = -EINVAL; |
1da177e4 LT |
759 | const unsigned long sb_block = 0; |
760 | const off_t x86_sb_off = 512; | |
761 | ||
552c3c6c MS |
762 | save_mount_options(sb, data); |
763 | ||
2d4319ef | 764 | sb->s_fs_info = kzalloc(sizeof(*befs_sb), GFP_KERNEL); |
1da177e4 | 765 | if (sb->s_fs_info == NULL) { |
dac52fc1 | 766 | pr_err("(%s): Unable to allocate memory for private " |
1da177e4 | 767 | "portion of superblock. Bailing.\n", sb->s_id); |
0418726b | 768 | goto unacquire_none; |
1da177e4 LT |
769 | } |
770 | befs_sb = BEFS_SB(sb); | |
1da177e4 LT |
771 | |
772 | if (!parse_options((char *) data, &befs_sb->mount_opts)) { | |
773 | befs_error(sb, "cannot parse mount options"); | |
0418726b | 774 | goto unacquire_priv_sbp; |
1da177e4 LT |
775 | } |
776 | ||
dac52fc1 | 777 | befs_debug(sb, "---> %s", __func__); |
1da177e4 | 778 | |
1da177e4 LT |
779 | if (!(sb->s_flags & MS_RDONLY)) { |
780 | befs_warning(sb, | |
781 | "No write support. Marking filesystem read-only"); | |
782 | sb->s_flags |= MS_RDONLY; | |
783 | } | |
1da177e4 LT |
784 | |
785 | /* | |
786 | * Set dummy blocksize to read super block. | |
787 | * Will be set to real fs blocksize later. | |
788 | * | |
789 | * Linux 2.4.10 and later refuse to read blocks smaller than | |
790 | * the hardsect size for the device. But we also need to read at | |
791 | * least 1k to get the second 512 bytes of the volume. | |
792 | * -WD 10-26-01 | |
793 | */ | |
794 | sb_min_blocksize(sb, 1024); | |
795 | ||
796 | if (!(bh = sb_bread(sb, sb_block))) { | |
797 | befs_error(sb, "unable to read superblock"); | |
0418726b | 798 | goto unacquire_priv_sbp; |
1da177e4 LT |
799 | } |
800 | ||
801 | /* account for offset of super block on x86 */ | |
802 | disk_sb = (befs_super_block *) bh->b_data; | |
152b95a1 HH |
803 | if ((disk_sb->magic1 == BEFS_SUPER_MAGIC1_LE) || |
804 | (disk_sb->magic1 == BEFS_SUPER_MAGIC1_BE)) { | |
1da177e4 LT |
805 | befs_debug(sb, "Using PPC superblock location"); |
806 | } else { | |
807 | befs_debug(sb, "Using x86 superblock location"); | |
808 | disk_sb = | |
809 | (befs_super_block *) ((void *) bh->b_data + x86_sb_off); | |
810 | } | |
811 | ||
8e19189e FF |
812 | if ((befs_load_sb(sb, disk_sb) != BEFS_OK) || |
813 | (befs_check_sb(sb) != BEFS_OK)) | |
0418726b | 814 | goto unacquire_bh; |
1da177e4 LT |
815 | |
816 | befs_dump_super_block(sb, disk_sb); | |
817 | ||
818 | brelse(bh); | |
819 | ||
1da177e4 | 820 | if( befs_sb->num_blocks > ~((sector_t)0) ) { |
dac52fc1 | 821 | befs_error(sb, "blocks count: %llu " |
1da177e4 LT |
822 | "is larger than the host can use", |
823 | befs_sb->num_blocks); | |
0418726b | 824 | goto unacquire_priv_sbp; |
1da177e4 LT |
825 | } |
826 | ||
827 | /* | |
828 | * set up enough so that it can read an inode | |
829 | * Fill in kernel superblock fields from private sb | |
830 | */ | |
831 | sb->s_magic = BEFS_SUPER_MAGIC; | |
832 | /* Set real blocksize of fs */ | |
833 | sb_set_blocksize(sb, (ulong) befs_sb->block_size); | |
b87221de | 834 | sb->s_op = &befs_sops; |
96eb5419 DH |
835 | root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir))); |
836 | if (IS_ERR(root)) { | |
837 | ret = PTR_ERR(root); | |
838 | goto unacquire_priv_sbp; | |
839 | } | |
48fde701 | 840 | sb->s_root = d_make_root(root); |
1da177e4 | 841 | if (!sb->s_root) { |
1da177e4 | 842 | befs_error(sb, "get root inode failed"); |
0418726b | 843 | goto unacquire_priv_sbp; |
1da177e4 LT |
844 | } |
845 | ||
846 | /* load nls library */ | |
847 | if (befs_sb->mount_opts.iocharset) { | |
848 | befs_debug(sb, "Loading nls: %s", | |
849 | befs_sb->mount_opts.iocharset); | |
850 | befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset); | |
851 | if (!befs_sb->nls) { | |
852 | befs_warning(sb, "Cannot load nls %s" | |
853 | " loading default nls", | |
854 | befs_sb->mount_opts.iocharset); | |
855 | befs_sb->nls = load_nls_default(); | |
856 | } | |
857 | /* load default nls if none is specified in mount options */ | |
858 | } else { | |
859 | befs_debug(sb, "Loading default nls"); | |
860 | befs_sb->nls = load_nls_default(); | |
861 | } | |
862 | ||
863 | return 0; | |
864 | /*****************/ | |
0418726b | 865 | unacquire_bh: |
1da177e4 LT |
866 | brelse(bh); |
867 | ||
0418726b | 868 | unacquire_priv_sbp: |
8dd5ca53 | 869 | kfree(befs_sb->mount_opts.iocharset); |
1da177e4 LT |
870 | kfree(sb->s_fs_info); |
871 | ||
0418726b | 872 | unacquire_none: |
1da177e4 | 873 | sb->s_fs_info = NULL; |
96eb5419 | 874 | return ret; |
1da177e4 LT |
875 | } |
876 | ||
877 | static int | |
878 | befs_remount(struct super_block *sb, int *flags, char *data) | |
879 | { | |
02b9984d | 880 | sync_filesystem(sb); |
1da177e4 LT |
881 | if (!(*flags & MS_RDONLY)) |
882 | return -EINVAL; | |
883 | return 0; | |
884 | } | |
885 | ||
886 | static int | |
726c3342 | 887 | befs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 888 | { |
726c3342 | 889 | struct super_block *sb = dentry->d_sb; |
8587246a | 890 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
1da177e4 | 891 | |
dac52fc1 | 892 | befs_debug(sb, "---> %s", __func__); |
1da177e4 LT |
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 */ | |
8587246a CL |
901 | buf->f_fsid.val[0] = (u32)id; |
902 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
1da177e4 LT |
903 | buf->f_namelen = BEFS_NAME_LEN; |
904 | ||
dac52fc1 | 905 | befs_debug(sb, "<--- %s", __func__); |
1da177e4 LT |
906 | |
907 | return 0; | |
908 | } | |
909 | ||
152a0836 AV |
910 | static struct dentry * |
911 | befs_mount(struct file_system_type *fs_type, int flags, const char *dev_name, | |
912 | void *data) | |
1da177e4 | 913 | { |
152a0836 | 914 | return mount_bdev(fs_type, flags, dev_name, data, befs_fill_super); |
1da177e4 LT |
915 | } |
916 | ||
917 | static struct file_system_type befs_fs_type = { | |
918 | .owner = THIS_MODULE, | |
919 | .name = "befs", | |
152a0836 | 920 | .mount = befs_mount, |
1da177e4 LT |
921 | .kill_sb = kill_block_super, |
922 | .fs_flags = FS_REQUIRES_DEV, | |
923 | }; | |
7f78e035 | 924 | MODULE_ALIAS_FS("befs"); |
1da177e4 LT |
925 | |
926 | static int __init | |
927 | init_befs_fs(void) | |
928 | { | |
929 | int err; | |
930 | ||
dac52fc1 | 931 | pr_info("version: %s\n", BEFS_VERSION); |
1da177e4 LT |
932 | |
933 | err = befs_init_inodecache(); | |
934 | if (err) | |
0418726b | 935 | goto unacquire_none; |
1da177e4 LT |
936 | |
937 | err = register_filesystem(&befs_fs_type); | |
938 | if (err) | |
0418726b | 939 | goto unacquire_inodecache; |
1da177e4 LT |
940 | |
941 | return 0; | |
942 | ||
0418726b | 943 | unacquire_inodecache: |
1da177e4 LT |
944 | befs_destroy_inodecache(); |
945 | ||
0418726b | 946 | unacquire_none: |
1da177e4 LT |
947 | return err; |
948 | } | |
949 | ||
950 | static void __exit | |
951 | exit_befs_fs(void) | |
952 | { | |
953 | befs_destroy_inodecache(); | |
954 | ||
955 | unregister_filesystem(&befs_fs_type); | |
956 | } | |
957 | ||
958 | /* | |
959 | Macros that typecheck the init and exit functions, | |
960 | ensures that they are called at init and cleanup, | |
961 | and eliminates warnings about unused functions. | |
962 | */ | |
963 | module_init(init_befs_fs) | |
964 | module_exit(exit_befs_fs) |