Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/befs/linuxvfs.c | |
3 | * | |
4 | * Copyright (C) 2001 Will Dyson <will_dyson@pobox.com | |
5 | * | |
6 | */ | |
7 | ||
dac52fc1 FF |
8 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
9 | ||
1da177e4 LT |
10 | #include <linux/module.h> |
11 | #include <linux/slab.h> | |
12 | #include <linux/fs.h> | |
13 | #include <linux/errno.h> | |
14 | #include <linux/stat.h> | |
15 | #include <linux/nls.h> | |
16 | #include <linux/buffer_head.h> | |
17 | #include <linux/vfs.h> | |
18 | #include <linux/parser.h> | |
19 | #include <linux/namei.h> | |
31aba059 | 20 | #include <linux/sched.h> |
1da177e4 LT |
21 | |
22 | #include "befs.h" | |
23 | #include "btree.h" | |
24 | #include "inode.h" | |
25 | #include "datastream.h" | |
26 | #include "super.h" | |
27 | #include "io.h" | |
1da177e4 LT |
28 | |
29 | MODULE_DESCRIPTION("BeOS File System (BeFS) driver"); | |
30 | MODULE_AUTHOR("Will Dyson"); | |
31 | MODULE_LICENSE("GPL"); | |
32 | ||
33 | /* The units the vfs expects inode->i_blocks to be in */ | |
34 | #define VFS_BLOCK_SIZE 512 | |
35 | ||
f0f49ef5 | 36 | static int befs_readdir(struct file *, struct dir_context *); |
1da177e4 LT |
37 | static int befs_get_block(struct inode *, sector_t, struct buffer_head *, int); |
38 | static int befs_readpage(struct file *file, struct page *page); | |
39 | static sector_t befs_bmap(struct address_space *mapping, sector_t block); | |
00cd8dd3 | 40 | static struct dentry *befs_lookup(struct inode *, struct dentry *, unsigned int); |
96eb5419 | 41 | static struct inode *befs_iget(struct super_block *, unsigned long); |
1da177e4 LT |
42 | static struct inode *befs_alloc_inode(struct super_block *sb); |
43 | static void befs_destroy_inode(struct inode *inode); | |
1da177e4 | 44 | static void befs_destroy_inodecache(void); |
008b150a | 45 | static void *befs_follow_link(struct dentry *, struct nameidata *); |
48bc06e7 | 46 | static void *befs_fast_follow_link(struct dentry *, struct nameidata *); |
1da177e4 LT |
47 | static int befs_utf2nls(struct super_block *sb, const char *in, int in_len, |
48 | char **out, int *out_len); | |
49 | static int befs_nls2utf(struct super_block *sb, const char *in, int in_len, | |
50 | char **out, int *out_len); | |
51 | static void befs_put_super(struct super_block *); | |
52 | static int befs_remount(struct super_block *, int *, char *); | |
726c3342 | 53 | static int befs_statfs(struct dentry *, struct kstatfs *); |
1da177e4 LT |
54 | static int parse_options(char *, befs_mount_options *); |
55 | ||
56 | static const struct super_operations befs_sops = { | |
1da177e4 LT |
57 | .alloc_inode = befs_alloc_inode, /* allocate a new inode */ |
58 | .destroy_inode = befs_destroy_inode, /* deallocate an inode */ | |
59 | .put_super = befs_put_super, /* uninit super */ | |
60 | .statfs = befs_statfs, /* statfs */ | |
61 | .remount_fs = befs_remount, | |
552c3c6c | 62 | .show_options = generic_show_options, |
1da177e4 LT |
63 | }; |
64 | ||
65 | /* slab cache for befs_inode_info objects */ | |
e18b890b | 66 | static struct kmem_cache *befs_inode_cachep; |
1da177e4 | 67 | |
4b6f5d20 | 68 | static const struct file_operations befs_dir_operations = { |
1da177e4 | 69 | .read = generic_read_dir, |
f0f49ef5 | 70 | .iterate = befs_readdir, |
59af1584 | 71 | .llseek = generic_file_llseek, |
1da177e4 LT |
72 | }; |
73 | ||
754661f1 | 74 | static const struct inode_operations befs_dir_inode_operations = { |
1da177e4 LT |
75 | .lookup = befs_lookup, |
76 | }; | |
77 | ||
f5e54d6e | 78 | static const struct address_space_operations befs_aops = { |
1da177e4 | 79 | .readpage = befs_readpage, |
1da177e4 LT |
80 | .bmap = befs_bmap, |
81 | }; | |
82 | ||
48bc06e7 AV |
83 | static const struct inode_operations befs_fast_symlink_inode_operations = { |
84 | .readlink = generic_readlink, | |
85 | .follow_link = befs_fast_follow_link, | |
86 | }; | |
87 | ||
754661f1 | 88 | static const struct inode_operations befs_symlink_inode_operations = { |
1da177e4 LT |
89 | .readlink = generic_readlink, |
90 | .follow_link = befs_follow_link, | |
48bc06e7 | 91 | .put_link = kfree_put_link, |
1da177e4 LT |
92 | }; |
93 | ||
94 | /* | |
95 | * Called by generic_file_read() to read a page of data | |
96 | * | |
97 | * In turn, simply calls a generic block read function and | |
98 | * passes it the address of befs_get_block, for mapping file | |
99 | * positions to disk blocks. | |
100 | */ | |
101 | static int | |
102 | befs_readpage(struct file *file, struct page *page) | |
103 | { | |
104 | return block_read_full_page(page, befs_get_block); | |
105 | } | |
106 | ||
107 | static sector_t | |
108 | befs_bmap(struct address_space *mapping, sector_t block) | |
109 | { | |
110 | return generic_block_bmap(mapping, block, befs_get_block); | |
111 | } | |
112 | ||
113 | /* | |
114 | * Generic function to map a file position (block) to a | |
115 | * disk offset (passed back in bh_result). | |
116 | * | |
117 | * Used by many higher level functions. | |
118 | * | |
119 | * Calls befs_fblock2brun() in datastream.c to do the real work. | |
120 | * | |
121 | * -WD 10-26-01 | |
122 | */ | |
123 | ||
124 | static int | |
125 | befs_get_block(struct inode *inode, sector_t block, | |
126 | struct buffer_head *bh_result, int create) | |
127 | { | |
128 | struct super_block *sb = inode->i_sb; | |
129 | befs_data_stream *ds = &BEFS_I(inode)->i_data.ds; | |
130 | befs_block_run run = BAD_IADDR; | |
131 | int res = 0; | |
132 | ulong disk_off; | |
133 | ||
134 | befs_debug(sb, "---> befs_get_block() for inode %lu, block %ld", | |
dac52fc1 | 135 | (unsigned long)inode->i_ino, (long)block); |
1da177e4 LT |
136 | if (create) { |
137 | befs_error(sb, "befs_get_block() was asked to write to " | |
dac52fc1 FF |
138 | "block %ld in inode %lu", (long)block, |
139 | (unsigned long)inode->i_ino); | |
1da177e4 LT |
140 | return -EPERM; |
141 | } | |
142 | ||
143 | res = befs_fblock2brun(sb, ds, block, &run); | |
144 | if (res != BEFS_OK) { | |
145 | befs_error(sb, | |
dac52fc1 FF |
146 | "<--- %s for inode %lu, block %ld ERROR", |
147 | __func__, (unsigned long)inode->i_ino, | |
148 | (long)block); | |
1da177e4 LT |
149 | return -EFBIG; |
150 | } | |
151 | ||
152 | disk_off = (ulong) iaddr2blockno(sb, &run); | |
153 | ||
154 | map_bh(bh_result, inode->i_sb, disk_off); | |
155 | ||
dac52fc1 FF |
156 | befs_debug(sb, "<--- %s for inode %lu, block %ld, disk address %lu", |
157 | __func__, (unsigned long)inode->i_ino, (long)block, | |
158 | (unsigned long)disk_off); | |
1da177e4 LT |
159 | |
160 | return 0; | |
161 | } | |
162 | ||
163 | static struct dentry * | |
00cd8dd3 | 164 | befs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) |
1da177e4 LT |
165 | { |
166 | struct inode *inode = NULL; | |
167 | struct super_block *sb = dir->i_sb; | |
168 | befs_data_stream *ds = &BEFS_I(dir)->i_data.ds; | |
169 | befs_off_t offset; | |
170 | int ret; | |
171 | int utfnamelen; | |
172 | char *utfname; | |
173 | const char *name = dentry->d_name.name; | |
174 | ||
dac52fc1 FF |
175 | befs_debug(sb, "---> %s name %s inode %ld", __func__, |
176 | dentry->d_name.name, dir->i_ino); | |
1da177e4 LT |
177 | |
178 | /* Convert to UTF-8 */ | |
179 | if (BEFS_SB(sb)->nls) { | |
180 | ret = | |
181 | befs_nls2utf(sb, name, strlen(name), &utfname, &utfnamelen); | |
182 | if (ret < 0) { | |
dac52fc1 | 183 | befs_debug(sb, "<--- %s ERROR", __func__); |
1da177e4 LT |
184 | return ERR_PTR(ret); |
185 | } | |
186 | ret = befs_btree_find(sb, ds, utfname, &offset); | |
187 | kfree(utfname); | |
188 | ||
189 | } else { | |
190 | ret = befs_btree_find(sb, ds, dentry->d_name.name, &offset); | |
191 | } | |
192 | ||
193 | if (ret == BEFS_BT_NOT_FOUND) { | |
dac52fc1 | 194 | befs_debug(sb, "<--- %s %s not found", __func__, |
1da177e4 LT |
195 | dentry->d_name.name); |
196 | return ERR_PTR(-ENOENT); | |
197 | ||
198 | } else if (ret != BEFS_OK || offset == 0) { | |
dac52fc1 | 199 | befs_warning(sb, "<--- %s Error", __func__); |
1da177e4 LT |
200 | return ERR_PTR(-ENODATA); |
201 | } | |
202 | ||
96eb5419 DH |
203 | inode = befs_iget(dir->i_sb, (ino_t) offset); |
204 | if (IS_ERR(inode)) | |
205 | return ERR_CAST(inode); | |
1da177e4 LT |
206 | |
207 | d_add(dentry, inode); | |
208 | ||
dac52fc1 | 209 | befs_debug(sb, "<--- %s", __func__); |
1da177e4 LT |
210 | |
211 | return NULL; | |
212 | } | |
213 | ||
214 | static int | |
f0f49ef5 | 215 | befs_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 216 | { |
f0f49ef5 | 217 | struct inode *inode = file_inode(file); |
1da177e4 LT |
218 | struct super_block *sb = inode->i_sb; |
219 | befs_data_stream *ds = &BEFS_I(inode)->i_data.ds; | |
220 | befs_off_t value; | |
221 | int result; | |
222 | size_t keysize; | |
223 | unsigned char d_type; | |
224 | char keybuf[BEFS_NAME_LEN + 1]; | |
f0f49ef5 | 225 | const char *dirname = file->f_path.dentry->d_name.name; |
1da177e4 | 226 | |
dac52fc1 FF |
227 | befs_debug(sb, "---> %s name %s, inode %ld, ctx->pos %lld", |
228 | __func__, dirname, inode->i_ino, ctx->pos); | |
1da177e4 | 229 | |
f0f49ef5 AV |
230 | more: |
231 | result = befs_btree_read(sb, ds, ctx->pos, BEFS_NAME_LEN + 1, | |
1da177e4 LT |
232 | keybuf, &keysize, &value); |
233 | ||
234 | if (result == BEFS_ERR) { | |
dac52fc1 | 235 | befs_debug(sb, "<--- %s ERROR", __func__); |
1da177e4 LT |
236 | befs_error(sb, "IO error reading %s (inode %lu)", |
237 | dirname, inode->i_ino); | |
238 | return -EIO; | |
239 | ||
240 | } else if (result == BEFS_BT_END) { | |
dac52fc1 | 241 | befs_debug(sb, "<--- %s END", __func__); |
1da177e4 LT |
242 | return 0; |
243 | ||
244 | } else if (result == BEFS_BT_EMPTY) { | |
dac52fc1 | 245 | befs_debug(sb, "<--- %s Empty directory", __func__); |
1da177e4 LT |
246 | return 0; |
247 | } | |
248 | ||
249 | d_type = DT_UNKNOWN; | |
250 | ||
251 | /* Convert to NLS */ | |
252 | if (BEFS_SB(sb)->nls) { | |
f0f49ef5 AV |
253 | char *nlsname; |
254 | int nlsnamelen; | |
1da177e4 LT |
255 | result = |
256 | befs_utf2nls(sb, keybuf, keysize, &nlsname, &nlsnamelen); | |
257 | if (result < 0) { | |
dac52fc1 | 258 | befs_debug(sb, "<--- %s ERROR", __func__); |
1da177e4 LT |
259 | return result; |
260 | } | |
f0f49ef5 AV |
261 | if (!dir_emit(ctx, nlsname, nlsnamelen, |
262 | (ino_t) value, d_type)) { | |
263 | kfree(nlsname); | |
264 | return 0; | |
265 | } | |
1da177e4 | 266 | kfree(nlsname); |
1da177e4 | 267 | } else { |
f0f49ef5 AV |
268 | if (!dir_emit(ctx, keybuf, keysize, |
269 | (ino_t) value, d_type)) | |
270 | return 0; | |
1da177e4 | 271 | } |
f0f49ef5 AV |
272 | ctx->pos++; |
273 | goto more; | |
1da177e4 | 274 | |
dac52fc1 | 275 | befs_debug(sb, "<--- %s pos %lld", __func__, ctx->pos); |
1da177e4 LT |
276 | |
277 | return 0; | |
278 | } | |
279 | ||
280 | static struct inode * | |
281 | befs_alloc_inode(struct super_block *sb) | |
282 | { | |
283 | struct befs_inode_info *bi; | |
284 | bi = (struct befs_inode_info *)kmem_cache_alloc(befs_inode_cachep, | |
e94b1766 | 285 | GFP_KERNEL); |
1da177e4 LT |
286 | if (!bi) |
287 | return NULL; | |
288 | return &bi->vfs_inode; | |
289 | } | |
290 | ||
fa0d7e3d | 291 | static void befs_i_callback(struct rcu_head *head) |
1da177e4 | 292 | { |
fa0d7e3d | 293 | struct inode *inode = container_of(head, struct inode, i_rcu); |
1da177e4 LT |
294 | kmem_cache_free(befs_inode_cachep, BEFS_I(inode)); |
295 | } | |
296 | ||
fa0d7e3d NP |
297 | static void befs_destroy_inode(struct inode *inode) |
298 | { | |
299 | call_rcu(&inode->i_rcu, befs_i_callback); | |
300 | } | |
301 | ||
51cc5068 | 302 | static void init_once(void *foo) |
1da177e4 LT |
303 | { |
304 | struct befs_inode_info *bi = (struct befs_inode_info *) foo; | |
a35afb83 CL |
305 | |
306 | inode_init_once(&bi->vfs_inode); | |
1da177e4 LT |
307 | } |
308 | ||
96eb5419 | 309 | static struct inode *befs_iget(struct super_block *sb, unsigned long ino) |
1da177e4 LT |
310 | { |
311 | struct buffer_head *bh = NULL; | |
312 | befs_inode *raw_inode = NULL; | |
313 | ||
1da177e4 LT |
314 | befs_sb_info *befs_sb = BEFS_SB(sb); |
315 | befs_inode_info *befs_ino = NULL; | |
96eb5419 DH |
316 | struct inode *inode; |
317 | long ret = -EIO; | |
1da177e4 | 318 | |
dac52fc1 | 319 | befs_debug(sb, "---> %s inode = %lu", __func__, ino); |
96eb5419 DH |
320 | |
321 | inode = iget_locked(sb, ino); | |
ac34a1b3 RP |
322 | if (!inode) |
323 | return ERR_PTR(-ENOMEM); | |
96eb5419 DH |
324 | if (!(inode->i_state & I_NEW)) |
325 | return inode; | |
1da177e4 LT |
326 | |
327 | befs_ino = BEFS_I(inode); | |
328 | ||
329 | /* convert from vfs's inode number to befs's inode number */ | |
330 | befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino); | |
331 | ||
332 | befs_debug(sb, " real inode number [%u, %hu, %hu]", | |
333 | befs_ino->i_inode_num.allocation_group, | |
334 | befs_ino->i_inode_num.start, befs_ino->i_inode_num.len); | |
335 | ||
336 | bh = befs_bread(sb, inode->i_ino); | |
337 | if (!bh) { | |
338 | befs_error(sb, "unable to read inode block - " | |
339 | "inode = %lu", inode->i_ino); | |
0418726b | 340 | goto unacquire_none; |
1da177e4 LT |
341 | } |
342 | ||
343 | raw_inode = (befs_inode *) bh->b_data; | |
344 | ||
345 | befs_dump_inode(sb, raw_inode); | |
346 | ||
347 | if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) { | |
348 | befs_error(sb, "Bad inode: %lu", inode->i_ino); | |
0418726b | 349 | goto unacquire_bh; |
1da177e4 LT |
350 | } |
351 | ||
352 | inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode); | |
353 | ||
354 | /* | |
355 | * set uid and gid. But since current BeOS is single user OS, so | |
356 | * you can change by "uid" or "gid" options. | |
357 | */ | |
358 | ||
359 | inode->i_uid = befs_sb->mount_opts.use_uid ? | |
31aba059 EB |
360 | befs_sb->mount_opts.uid : |
361 | make_kuid(&init_user_ns, fs32_to_cpu(sb, raw_inode->uid)); | |
1da177e4 | 362 | inode->i_gid = befs_sb->mount_opts.use_gid ? |
31aba059 EB |
363 | befs_sb->mount_opts.gid : |
364 | make_kgid(&init_user_ns, fs32_to_cpu(sb, raw_inode->gid)); | |
1da177e4 | 365 | |
bfe86848 | 366 | set_nlink(inode, 1); |
1da177e4 LT |
367 | |
368 | /* | |
369 | * BEFS's time is 64 bits, but current VFS is 32 bits... | |
370 | * BEFS don't have access time. Nor inode change time. VFS | |
371 | * doesn't have creation time. | |
372 | * Also, the lower 16 bits of the last_modified_time and | |
373 | * create_time are just a counter to help ensure uniqueness | |
374 | * for indexing purposes. (PFD, page 54) | |
375 | */ | |
376 | ||
377 | inode->i_mtime.tv_sec = | |
378 | fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16; | |
379 | inode->i_mtime.tv_nsec = 0; /* lower 16 bits are not a time */ | |
380 | inode->i_ctime = inode->i_mtime; | |
381 | inode->i_atime = inode->i_mtime; | |
1da177e4 LT |
382 | |
383 | befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num); | |
384 | befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent); | |
385 | befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes); | |
386 | befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags); | |
387 | ||
388 | if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){ | |
389 | inode->i_size = 0; | |
390 | inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE; | |
39d7a29f FF |
391 | strlcpy(befs_ino->i_data.symlink, raw_inode->data.symlink, |
392 | BEFS_SYMLINK_LEN); | |
1da177e4 LT |
393 | } else { |
394 | int num_blks; | |
395 | ||
396 | befs_ino->i_data.ds = | |
e0e3d32b | 397 | fsds_to_cpu(sb, &raw_inode->data.datastream); |
1da177e4 LT |
398 | |
399 | num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds); | |
400 | inode->i_blocks = | |
401 | num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE); | |
402 | inode->i_size = befs_ino->i_data.ds.size; | |
403 | } | |
404 | ||
405 | inode->i_mapping->a_ops = &befs_aops; | |
406 | ||
407 | if (S_ISREG(inode->i_mode)) { | |
2cf06916 | 408 | inode->i_fop = &generic_ro_fops; |
1da177e4 LT |
409 | } else if (S_ISDIR(inode->i_mode)) { |
410 | inode->i_op = &befs_dir_inode_operations; | |
411 | inode->i_fop = &befs_dir_operations; | |
412 | } else if (S_ISLNK(inode->i_mode)) { | |
48bc06e7 AV |
413 | if (befs_ino->i_flags & BEFS_LONG_SYMLINK) |
414 | inode->i_op = &befs_symlink_inode_operations; | |
415 | else | |
416 | inode->i_op = &befs_fast_symlink_inode_operations; | |
1da177e4 LT |
417 | } else { |
418 | befs_error(sb, "Inode %lu is not a regular file, " | |
419 | "directory or symlink. THAT IS WRONG! BeFS has no " | |
420 | "on disk special files", inode->i_ino); | |
0418726b | 421 | goto unacquire_bh; |
1da177e4 LT |
422 | } |
423 | ||
424 | brelse(bh); | |
dac52fc1 | 425 | befs_debug(sb, "<--- %s", __func__); |
96eb5419 DH |
426 | unlock_new_inode(inode); |
427 | return inode; | |
1da177e4 | 428 | |
0418726b | 429 | unacquire_bh: |
1da177e4 LT |
430 | brelse(bh); |
431 | ||
0418726b | 432 | unacquire_none: |
96eb5419 | 433 | iget_failed(inode); |
dac52fc1 | 434 | befs_debug(sb, "<--- %s - Bad inode", __func__); |
96eb5419 | 435 | return ERR_PTR(ret); |
1da177e4 LT |
436 | } |
437 | ||
438 | /* Initialize the inode cache. Called at fs setup. | |
20c2df83 | 439 | * |
1da177e4 LT |
440 | * Taken from NFS implementation by Al Viro. |
441 | */ | |
91a52ab7 | 442 | static int __init |
1da177e4 LT |
443 | befs_init_inodecache(void) |
444 | { | |
445 | befs_inode_cachep = kmem_cache_create("befs_inode_cache", | |
446 | sizeof (struct befs_inode_info), | |
fffb60f9 PJ |
447 | 0, (SLAB_RECLAIM_ACCOUNT| |
448 | SLAB_MEM_SPREAD), | |
20c2df83 | 449 | init_once); |
1da177e4 | 450 | if (befs_inode_cachep == NULL) { |
dac52fc1 | 451 | pr_err("%s: Couldn't initialize inode slabcache\n", __func__); |
1da177e4 LT |
452 | return -ENOMEM; |
453 | } | |
1da177e4 LT |
454 | return 0; |
455 | } | |
456 | ||
457 | /* Called at fs teardown. | |
458 | * | |
459 | * Taken from NFS implementation by Al Viro. | |
460 | */ | |
461 | static void | |
462 | befs_destroy_inodecache(void) | |
463 | { | |
8c0a8537 KS |
464 | /* |
465 | * Make sure all delayed rcu free inodes are flushed before we | |
466 | * destroy cache. | |
467 | */ | |
468 | rcu_barrier(); | |
1a1d92c1 | 469 | kmem_cache_destroy(befs_inode_cachep); |
1da177e4 LT |
470 | } |
471 | ||
472 | /* | |
473 | * The inode of symbolic link is different to data stream. | |
474 | * The data stream become link name. Unless the LONG_SYMLINK | |
475 | * flag is set. | |
476 | */ | |
db873896 | 477 | static void * |
1da177e4 LT |
478 | befs_follow_link(struct dentry *dentry, struct nameidata *nd) |
479 | { | |
48bc06e7 | 480 | struct super_block *sb = dentry->d_sb; |
1da177e4 | 481 | befs_inode_info *befs_ino = BEFS_I(dentry->d_inode); |
48bc06e7 AV |
482 | befs_data_stream *data = &befs_ino->i_data.ds; |
483 | befs_off_t len = data->size; | |
1da177e4 LT |
484 | char *link; |
485 | ||
48bc06e7 AV |
486 | if (len == 0) { |
487 | befs_error(sb, "Long symlink with illegal length"); | |
488 | link = ERR_PTR(-EIO); | |
489 | } else { | |
490 | befs_debug(sb, "Follow long symlink"); | |
1da177e4 | 491 | |
48bc06e7 AV |
492 | link = kmalloc(len, GFP_NOFS); |
493 | if (!link) { | |
494 | link = ERR_PTR(-ENOMEM); | |
495 | } else if (befs_read_lsymlink(sb, data, link, len) != len) { | |
496 | kfree(link); | |
497 | befs_error(sb, "Failed to read entire long symlink"); | |
1da177e4 | 498 | link = ERR_PTR(-EIO); |
7df5fa06 | 499 | } else { |
48bc06e7 | 500 | link[len - 1] = '\0'; |
1da177e4 | 501 | } |
1da177e4 | 502 | } |
1da177e4 | 503 | nd_set_link(nd, link); |
008b150a | 504 | return NULL; |
1da177e4 LT |
505 | } |
506 | ||
48bc06e7 AV |
507 | |
508 | static void * | |
509 | befs_fast_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1da177e4 LT |
510 | { |
511 | befs_inode_info *befs_ino = BEFS_I(dentry->d_inode); | |
48bc06e7 AV |
512 | nd_set_link(nd, befs_ino->i_data.symlink); |
513 | return NULL; | |
1da177e4 LT |
514 | } |
515 | ||
516 | /* | |
517 | * UTF-8 to NLS charset convert routine | |
518 | * | |
519 | * | |
520 | * Changed 8/10/01 by Will Dyson. Now use uni2char() / char2uni() rather than | |
521 | * the nls tables directly | |
522 | */ | |
523 | ||
524 | static int | |
525 | befs_utf2nls(struct super_block *sb, const char *in, | |
526 | int in_len, char **out, int *out_len) | |
527 | { | |
528 | struct nls_table *nls = BEFS_SB(sb)->nls; | |
529 | int i, o; | |
74675a58 | 530 | unicode_t uni; |
1da177e4 LT |
531 | int unilen, utflen; |
532 | char *result; | |
94f563c4 DC |
533 | /* The utf8->nls conversion won't make the final nls string bigger |
534 | * than the utf one, but if the string is pure ascii they'll have the | |
535 | * same width and an extra char is needed to save the additional \0 | |
536 | */ | |
537 | int maxlen = in_len + 1; | |
1da177e4 | 538 | |
dac52fc1 | 539 | befs_debug(sb, "---> %s", __func__); |
1da177e4 LT |
540 | |
541 | if (!nls) { | |
dac52fc1 | 542 | befs_error(sb, "%s called with no NLS table loaded", __func__); |
1da177e4 LT |
543 | return -EINVAL; |
544 | } | |
545 | ||
546 | *out = result = kmalloc(maxlen, GFP_NOFS); | |
547 | if (!*out) { | |
dac52fc1 | 548 | befs_error(sb, "%s cannot allocate memory", __func__); |
1da177e4 LT |
549 | *out_len = 0; |
550 | return -ENOMEM; | |
551 | } | |
552 | ||
553 | for (i = o = 0; i < in_len; i += utflen, o += unilen) { | |
554 | ||
555 | /* convert from UTF-8 to Unicode */ | |
74675a58 AS |
556 | utflen = utf8_to_utf32(&in[i], in_len - i, &uni); |
557 | if (utflen < 0) | |
1da177e4 | 558 | goto conv_err; |
1da177e4 LT |
559 | |
560 | /* convert from Unicode to nls */ | |
74675a58 AS |
561 | if (uni > MAX_WCHAR_T) |
562 | goto conv_err; | |
1da177e4 | 563 | unilen = nls->uni2char(uni, &result[o], in_len - o); |
74675a58 | 564 | if (unilen < 0) |
1da177e4 | 565 | goto conv_err; |
1da177e4 LT |
566 | } |
567 | result[o] = '\0'; | |
568 | *out_len = o; | |
569 | ||
dac52fc1 | 570 | befs_debug(sb, "<--- %s", __func__); |
1da177e4 LT |
571 | |
572 | return o; | |
573 | ||
574 | conv_err: | |
575 | befs_error(sb, "Name using character set %s contains a character that " | |
576 | "cannot be converted to unicode.", nls->charset); | |
dac52fc1 | 577 | befs_debug(sb, "<--- %s", __func__); |
1da177e4 LT |
578 | kfree(result); |
579 | return -EILSEQ; | |
580 | } | |
581 | ||
582 | /** | |
583 | * befs_nls2utf - Convert NLS string to utf8 encodeing | |
584 | * @sb: Superblock | |
817e1d90 FF |
585 | * @in: Input string buffer in NLS format |
586 | * @in_len: Length of input string in bytes | |
587 | * @out: The output string in UTF-8 format | |
588 | * @out_len: Length of the output buffer | |
1da177e4 | 589 | * |
817e1d90 | 590 | * Converts input string @in, which is in the format of the loaded NLS map, |
1da177e4 LT |
591 | * into a utf8 string. |
592 | * | |
817e1d90 | 593 | * The destination string @out is allocated by this function and the caller is |
1da177e4 LT |
594 | * responsible for freeing it with kfree() |
595 | * | |
817e1d90 | 596 | * On return, *@out_len is the length of @out in bytes. |
1da177e4 LT |
597 | * |
598 | * On success, the return value is the number of utf8 characters written to | |
817e1d90 | 599 | * the output buffer @out. |
1da177e4 LT |
600 | * |
601 | * On Failure, a negative number coresponding to the error code is returned. | |
602 | */ | |
603 | ||
604 | static int | |
605 | befs_nls2utf(struct super_block *sb, const char *in, | |
606 | int in_len, char **out, int *out_len) | |
607 | { | |
608 | struct nls_table *nls = BEFS_SB(sb)->nls; | |
609 | int i, o; | |
610 | wchar_t uni; | |
611 | int unilen, utflen; | |
612 | char *result; | |
94f563c4 DC |
613 | /* There're nls characters that will translate to 3-chars-wide UTF-8 |
614 | * characters, a additional byte is needed to save the final \0 | |
615 | * in special cases */ | |
616 | int maxlen = (3 * in_len) + 1; | |
1da177e4 | 617 | |
dac52fc1 | 618 | befs_debug(sb, "---> %s\n", __func__); |
1da177e4 LT |
619 | |
620 | if (!nls) { | |
dac52fc1 FF |
621 | befs_error(sb, "%s called with no NLS table loaded.", |
622 | __func__); | |
1da177e4 LT |
623 | return -EINVAL; |
624 | } | |
625 | ||
626 | *out = result = kmalloc(maxlen, GFP_NOFS); | |
627 | if (!*out) { | |
dac52fc1 | 628 | befs_error(sb, "%s cannot allocate memory", __func__); |
1da177e4 LT |
629 | *out_len = 0; |
630 | return -ENOMEM; | |
631 | } | |
632 | ||
633 | for (i = o = 0; i < in_len; i += unilen, o += utflen) { | |
634 | ||
635 | /* convert from nls to unicode */ | |
636 | unilen = nls->char2uni(&in[i], in_len - i, &uni); | |
74675a58 | 637 | if (unilen < 0) |
1da177e4 | 638 | goto conv_err; |
1da177e4 LT |
639 | |
640 | /* convert from unicode to UTF-8 */ | |
74675a58 AS |
641 | utflen = utf32_to_utf8(uni, &result[o], 3); |
642 | if (utflen <= 0) | |
1da177e4 | 643 | goto conv_err; |
1da177e4 LT |
644 | } |
645 | ||
646 | result[o] = '\0'; | |
647 | *out_len = o; | |
648 | ||
dac52fc1 | 649 | befs_debug(sb, "<--- %s", __func__); |
1da177e4 LT |
650 | |
651 | return i; | |
652 | ||
653 | conv_err: | |
654 | befs_error(sb, "Name using charecter set %s contains a charecter that " | |
655 | "cannot be converted to unicode.", nls->charset); | |
dac52fc1 | 656 | befs_debug(sb, "<--- %s", __func__); |
1da177e4 LT |
657 | kfree(result); |
658 | return -EILSEQ; | |
659 | } | |
660 | ||
661 | /** | |
662 | * Use the | |
663 | * | |
664 | */ | |
665 | enum { | |
666 | Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err, | |
667 | }; | |
668 | ||
a447c093 | 669 | static const match_table_t befs_tokens = { |
1da177e4 LT |
670 | {Opt_uid, "uid=%d"}, |
671 | {Opt_gid, "gid=%d"}, | |
672 | {Opt_charset, "iocharset=%s"}, | |
673 | {Opt_debug, "debug"}, | |
674 | {Opt_err, NULL} | |
675 | }; | |
676 | ||
677 | static int | |
678 | parse_options(char *options, befs_mount_options * opts) | |
679 | { | |
680 | char *p; | |
681 | substring_t args[MAX_OPT_ARGS]; | |
682 | int option; | |
31aba059 EB |
683 | kuid_t uid; |
684 | kgid_t gid; | |
1da177e4 LT |
685 | |
686 | /* Initialize options */ | |
31aba059 EB |
687 | opts->uid = GLOBAL_ROOT_UID; |
688 | opts->gid = GLOBAL_ROOT_GID; | |
1da177e4 LT |
689 | opts->use_uid = 0; |
690 | opts->use_gid = 0; | |
691 | opts->iocharset = NULL; | |
692 | opts->debug = 0; | |
693 | ||
694 | if (!options) | |
695 | return 1; | |
696 | ||
697 | while ((p = strsep(&options, ",")) != NULL) { | |
698 | int token; | |
699 | if (!*p) | |
700 | continue; | |
701 | ||
702 | token = match_token(p, befs_tokens, args); | |
703 | switch (token) { | |
704 | case Opt_uid: | |
705 | if (match_int(&args[0], &option)) | |
706 | return 0; | |
31aba059 EB |
707 | uid = INVALID_UID; |
708 | if (option >= 0) | |
709 | uid = make_kuid(current_user_ns(), option); | |
710 | if (!uid_valid(uid)) { | |
dac52fc1 FF |
711 | pr_err("Invalid uid %d, " |
712 | "using default\n", option); | |
1da177e4 LT |
713 | break; |
714 | } | |
31aba059 | 715 | opts->uid = uid; |
1da177e4 LT |
716 | opts->use_uid = 1; |
717 | break; | |
718 | case Opt_gid: | |
719 | if (match_int(&args[0], &option)) | |
720 | return 0; | |
31aba059 EB |
721 | gid = INVALID_GID; |
722 | if (option >= 0) | |
723 | gid = make_kgid(current_user_ns(), option); | |
724 | if (!gid_valid(gid)) { | |
dac52fc1 FF |
725 | pr_err("Invalid gid %d, " |
726 | "using default\n", option); | |
1da177e4 LT |
727 | break; |
728 | } | |
31aba059 | 729 | opts->gid = gid; |
1da177e4 LT |
730 | opts->use_gid = 1; |
731 | break; | |
732 | case Opt_charset: | |
733 | kfree(opts->iocharset); | |
734 | opts->iocharset = match_strdup(&args[0]); | |
735 | if (!opts->iocharset) { | |
dac52fc1 FF |
736 | pr_err("allocation failure for " |
737 | "iocharset string\n"); | |
1da177e4 LT |
738 | return 0; |
739 | } | |
740 | break; | |
741 | case Opt_debug: | |
742 | opts->debug = 1; | |
743 | break; | |
744 | default: | |
dac52fc1 FF |
745 | pr_err("Unrecognized mount option \"%s\" " |
746 | "or missing value\n", p); | |
1da177e4 LT |
747 | return 0; |
748 | } | |
749 | } | |
750 | return 1; | |
751 | } | |
752 | ||
753 | /* This function has the responsibiltiy of getting the | |
754 | * filesystem ready for unmounting. | |
25985edc | 755 | * Basically, we free everything that we allocated in |
1da177e4 LT |
756 | * befs_read_inode |
757 | */ | |
758 | static void | |
759 | befs_put_super(struct super_block *sb) | |
760 | { | |
f99d49ad JJ |
761 | kfree(BEFS_SB(sb)->mount_opts.iocharset); |
762 | BEFS_SB(sb)->mount_opts.iocharset = NULL; | |
6d729e44 | 763 | unload_nls(BEFS_SB(sb)->nls); |
f99d49ad JJ |
764 | kfree(sb->s_fs_info); |
765 | sb->s_fs_info = NULL; | |
1da177e4 LT |
766 | } |
767 | ||
768 | /* Allocate private field of the superblock, fill it. | |
769 | * | |
770 | * Finish filling the public superblock fields | |
771 | * Make the root directory | |
772 | * Load a set of NLS translations if needed. | |
773 | */ | |
774 | static int | |
775 | befs_fill_super(struct super_block *sb, void *data, int silent) | |
776 | { | |
777 | struct buffer_head *bh; | |
778 | befs_sb_info *befs_sb; | |
779 | befs_super_block *disk_sb; | |
780 | struct inode *root; | |
96eb5419 | 781 | long ret = -EINVAL; |
1da177e4 LT |
782 | const unsigned long sb_block = 0; |
783 | const off_t x86_sb_off = 512; | |
784 | ||
552c3c6c MS |
785 | save_mount_options(sb, data); |
786 | ||
2d4319ef | 787 | sb->s_fs_info = kzalloc(sizeof(*befs_sb), GFP_KERNEL); |
1da177e4 | 788 | if (sb->s_fs_info == NULL) { |
dac52fc1 | 789 | pr_err("(%s): Unable to allocate memory for private " |
1da177e4 | 790 | "portion of superblock. Bailing.\n", sb->s_id); |
0418726b | 791 | goto unacquire_none; |
1da177e4 LT |
792 | } |
793 | befs_sb = BEFS_SB(sb); | |
1da177e4 LT |
794 | |
795 | if (!parse_options((char *) data, &befs_sb->mount_opts)) { | |
796 | befs_error(sb, "cannot parse mount options"); | |
0418726b | 797 | goto unacquire_priv_sbp; |
1da177e4 LT |
798 | } |
799 | ||
dac52fc1 | 800 | befs_debug(sb, "---> %s", __func__); |
1da177e4 | 801 | |
1da177e4 LT |
802 | if (!(sb->s_flags & MS_RDONLY)) { |
803 | befs_warning(sb, | |
804 | "No write support. Marking filesystem read-only"); | |
805 | sb->s_flags |= MS_RDONLY; | |
806 | } | |
1da177e4 LT |
807 | |
808 | /* | |
809 | * Set dummy blocksize to read super block. | |
810 | * Will be set to real fs blocksize later. | |
811 | * | |
812 | * Linux 2.4.10 and later refuse to read blocks smaller than | |
813 | * the hardsect size for the device. But we also need to read at | |
814 | * least 1k to get the second 512 bytes of the volume. | |
815 | * -WD 10-26-01 | |
816 | */ | |
817 | sb_min_blocksize(sb, 1024); | |
818 | ||
819 | if (!(bh = sb_bread(sb, sb_block))) { | |
820 | befs_error(sb, "unable to read superblock"); | |
0418726b | 821 | goto unacquire_priv_sbp; |
1da177e4 LT |
822 | } |
823 | ||
824 | /* account for offset of super block on x86 */ | |
825 | disk_sb = (befs_super_block *) bh->b_data; | |
152b95a1 HH |
826 | if ((disk_sb->magic1 == BEFS_SUPER_MAGIC1_LE) || |
827 | (disk_sb->magic1 == BEFS_SUPER_MAGIC1_BE)) { | |
1da177e4 LT |
828 | befs_debug(sb, "Using PPC superblock location"); |
829 | } else { | |
830 | befs_debug(sb, "Using x86 superblock location"); | |
831 | disk_sb = | |
832 | (befs_super_block *) ((void *) bh->b_data + x86_sb_off); | |
833 | } | |
834 | ||
835 | if (befs_load_sb(sb, disk_sb) != BEFS_OK) | |
0418726b | 836 | goto unacquire_bh; |
1da177e4 LT |
837 | |
838 | befs_dump_super_block(sb, disk_sb); | |
839 | ||
840 | brelse(bh); | |
841 | ||
842 | if (befs_check_sb(sb) != BEFS_OK) | |
0418726b | 843 | goto unacquire_priv_sbp; |
1da177e4 LT |
844 | |
845 | if( befs_sb->num_blocks > ~((sector_t)0) ) { | |
dac52fc1 | 846 | befs_error(sb, "blocks count: %llu " |
1da177e4 LT |
847 | "is larger than the host can use", |
848 | befs_sb->num_blocks); | |
0418726b | 849 | goto unacquire_priv_sbp; |
1da177e4 LT |
850 | } |
851 | ||
852 | /* | |
853 | * set up enough so that it can read an inode | |
854 | * Fill in kernel superblock fields from private sb | |
855 | */ | |
856 | sb->s_magic = BEFS_SUPER_MAGIC; | |
857 | /* Set real blocksize of fs */ | |
858 | sb_set_blocksize(sb, (ulong) befs_sb->block_size); | |
b87221de | 859 | sb->s_op = &befs_sops; |
96eb5419 DH |
860 | root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir))); |
861 | if (IS_ERR(root)) { | |
862 | ret = PTR_ERR(root); | |
863 | goto unacquire_priv_sbp; | |
864 | } | |
48fde701 | 865 | sb->s_root = d_make_root(root); |
1da177e4 | 866 | if (!sb->s_root) { |
1da177e4 | 867 | befs_error(sb, "get root inode failed"); |
0418726b | 868 | goto unacquire_priv_sbp; |
1da177e4 LT |
869 | } |
870 | ||
871 | /* load nls library */ | |
872 | if (befs_sb->mount_opts.iocharset) { | |
873 | befs_debug(sb, "Loading nls: %s", | |
874 | befs_sb->mount_opts.iocharset); | |
875 | befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset); | |
876 | if (!befs_sb->nls) { | |
877 | befs_warning(sb, "Cannot load nls %s" | |
878 | " loading default nls", | |
879 | befs_sb->mount_opts.iocharset); | |
880 | befs_sb->nls = load_nls_default(); | |
881 | } | |
882 | /* load default nls if none is specified in mount options */ | |
883 | } else { | |
884 | befs_debug(sb, "Loading default nls"); | |
885 | befs_sb->nls = load_nls_default(); | |
886 | } | |
887 | ||
888 | return 0; | |
889 | /*****************/ | |
0418726b | 890 | unacquire_bh: |
1da177e4 LT |
891 | brelse(bh); |
892 | ||
0418726b | 893 | unacquire_priv_sbp: |
8dd5ca53 | 894 | kfree(befs_sb->mount_opts.iocharset); |
1da177e4 LT |
895 | kfree(sb->s_fs_info); |
896 | ||
0418726b | 897 | unacquire_none: |
1da177e4 | 898 | sb->s_fs_info = NULL; |
96eb5419 | 899 | return ret; |
1da177e4 LT |
900 | } |
901 | ||
902 | static int | |
903 | befs_remount(struct super_block *sb, int *flags, char *data) | |
904 | { | |
02b9984d | 905 | sync_filesystem(sb); |
1da177e4 LT |
906 | if (!(*flags & MS_RDONLY)) |
907 | return -EINVAL; | |
908 | return 0; | |
909 | } | |
910 | ||
911 | static int | |
726c3342 | 912 | befs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 913 | { |
726c3342 | 914 | struct super_block *sb = dentry->d_sb; |
8587246a | 915 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
1da177e4 | 916 | |
dac52fc1 | 917 | befs_debug(sb, "---> %s", __func__); |
1da177e4 LT |
918 | |
919 | buf->f_type = BEFS_SUPER_MAGIC; | |
920 | buf->f_bsize = sb->s_blocksize; | |
921 | buf->f_blocks = BEFS_SB(sb)->num_blocks; | |
922 | buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks; | |
923 | buf->f_bavail = buf->f_bfree; | |
924 | buf->f_files = 0; /* UNKNOWN */ | |
925 | buf->f_ffree = 0; /* UNKNOWN */ | |
8587246a CL |
926 | buf->f_fsid.val[0] = (u32)id; |
927 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
1da177e4 LT |
928 | buf->f_namelen = BEFS_NAME_LEN; |
929 | ||
dac52fc1 | 930 | befs_debug(sb, "<--- %s", __func__); |
1da177e4 LT |
931 | |
932 | return 0; | |
933 | } | |
934 | ||
152a0836 AV |
935 | static struct dentry * |
936 | befs_mount(struct file_system_type *fs_type, int flags, const char *dev_name, | |
937 | void *data) | |
1da177e4 | 938 | { |
152a0836 | 939 | return mount_bdev(fs_type, flags, dev_name, data, befs_fill_super); |
1da177e4 LT |
940 | } |
941 | ||
942 | static struct file_system_type befs_fs_type = { | |
943 | .owner = THIS_MODULE, | |
944 | .name = "befs", | |
152a0836 | 945 | .mount = befs_mount, |
1da177e4 LT |
946 | .kill_sb = kill_block_super, |
947 | .fs_flags = FS_REQUIRES_DEV, | |
948 | }; | |
7f78e035 | 949 | MODULE_ALIAS_FS("befs"); |
1da177e4 LT |
950 | |
951 | static int __init | |
952 | init_befs_fs(void) | |
953 | { | |
954 | int err; | |
955 | ||
dac52fc1 | 956 | pr_info("version: %s\n", BEFS_VERSION); |
1da177e4 LT |
957 | |
958 | err = befs_init_inodecache(); | |
959 | if (err) | |
0418726b | 960 | goto unacquire_none; |
1da177e4 LT |
961 | |
962 | err = register_filesystem(&befs_fs_type); | |
963 | if (err) | |
0418726b | 964 | goto unacquire_inodecache; |
1da177e4 LT |
965 | |
966 | return 0; | |
967 | ||
0418726b | 968 | unacquire_inodecache: |
1da177e4 LT |
969 | befs_destroy_inodecache(); |
970 | ||
0418726b | 971 | unacquire_none: |
1da177e4 LT |
972 | return err; |
973 | } | |
974 | ||
975 | static void __exit | |
976 | exit_befs_fs(void) | |
977 | { | |
978 | befs_destroy_inodecache(); | |
979 | ||
980 | unregister_filesystem(&befs_fs_type); | |
981 | } | |
982 | ||
983 | /* | |
984 | Macros that typecheck the init and exit functions, | |
985 | ensures that they are called at init and cleanup, | |
986 | and eliminates warnings about unused functions. | |
987 | */ | |
988 | module_init(init_befs_fs) | |
989 | module_exit(exit_befs_fs) |