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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/befs/linuxvfs.c | |
3 | * | |
4 | * Copyright (C) 2001 Will Dyson <will_dyson@pobox.com | |
5 | * | |
6 | */ | |
7 | ||
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); |
11803f97 | 45 | static int befs_symlink_readpage(struct file *, struct page *); |
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, |
e23e9aa7 | 69 | .iterate_shared = 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 | ||
11803f97 AV |
82 | static const struct address_space_operations befs_symlink_aops = { |
83 | .readpage = befs_symlink_readpage, | |
1da177e4 LT |
84 | }; |
85 | ||
86 | /* | |
87 | * Called by generic_file_read() to read a page of data | |
88 | * | |
89 | * In turn, simply calls a generic block read function and | |
90 | * passes it the address of befs_get_block, for mapping file | |
91 | * positions to disk blocks. | |
92 | */ | |
93 | static int | |
94 | befs_readpage(struct file *file, struct page *page) | |
95 | { | |
96 | return block_read_full_page(page, befs_get_block); | |
97 | } | |
98 | ||
99 | static sector_t | |
100 | befs_bmap(struct address_space *mapping, sector_t block) | |
101 | { | |
102 | return generic_block_bmap(mapping, block, befs_get_block); | |
103 | } | |
104 | ||
105 | /* | |
106 | * Generic function to map a file position (block) to a | |
107 | * disk offset (passed back in bh_result). | |
108 | * | |
109 | * Used by many higher level functions. | |
110 | * | |
111 | * Calls befs_fblock2brun() in datastream.c to do the real work. | |
112 | * | |
113 | * -WD 10-26-01 | |
114 | */ | |
115 | ||
116 | static int | |
117 | befs_get_block(struct inode *inode, sector_t block, | |
118 | struct buffer_head *bh_result, int create) | |
119 | { | |
120 | struct super_block *sb = inode->i_sb; | |
121 | befs_data_stream *ds = &BEFS_I(inode)->i_data.ds; | |
122 | befs_block_run run = BAD_IADDR; | |
abcf9116 | 123 | int res; |
1da177e4 LT |
124 | ulong disk_off; |
125 | ||
126 | befs_debug(sb, "---> befs_get_block() for inode %lu, block %ld", | |
dac52fc1 | 127 | (unsigned long)inode->i_ino, (long)block); |
1da177e4 LT |
128 | if (create) { |
129 | befs_error(sb, "befs_get_block() was asked to write to " | |
dac52fc1 FF |
130 | "block %ld in inode %lu", (long)block, |
131 | (unsigned long)inode->i_ino); | |
1da177e4 LT |
132 | return -EPERM; |
133 | } | |
134 | ||
135 | res = befs_fblock2brun(sb, ds, block, &run); | |
136 | if (res != BEFS_OK) { | |
137 | befs_error(sb, | |
dac52fc1 FF |
138 | "<--- %s for inode %lu, block %ld ERROR", |
139 | __func__, (unsigned long)inode->i_ino, | |
140 | (long)block); | |
1da177e4 LT |
141 | return -EFBIG; |
142 | } | |
143 | ||
144 | disk_off = (ulong) iaddr2blockno(sb, &run); | |
145 | ||
146 | map_bh(bh_result, inode->i_sb, disk_off); | |
147 | ||
dac52fc1 FF |
148 | befs_debug(sb, "<--- %s for inode %lu, block %ld, disk address %lu", |
149 | __func__, (unsigned long)inode->i_ino, (long)block, | |
150 | (unsigned long)disk_off); | |
1da177e4 LT |
151 | |
152 | return 0; | |
153 | } | |
154 | ||
155 | static struct dentry * | |
00cd8dd3 | 156 | befs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) |
1da177e4 | 157 | { |
c9408763 | 158 | struct inode *inode; |
1da177e4 | 159 | struct super_block *sb = dir->i_sb; |
22341d8f | 160 | const befs_data_stream *ds = &BEFS_I(dir)->i_data.ds; |
1da177e4 LT |
161 | befs_off_t offset; |
162 | int ret; | |
163 | int utfnamelen; | |
164 | char *utfname; | |
165 | const char *name = dentry->d_name.name; | |
166 | ||
a455589f AV |
167 | befs_debug(sb, "---> %s name %pd inode %ld", __func__, |
168 | dentry, dir->i_ino); | |
1da177e4 LT |
169 | |
170 | /* Convert to UTF-8 */ | |
171 | if (BEFS_SB(sb)->nls) { | |
172 | ret = | |
173 | befs_nls2utf(sb, name, strlen(name), &utfname, &utfnamelen); | |
174 | if (ret < 0) { | |
dac52fc1 | 175 | befs_debug(sb, "<--- %s ERROR", __func__); |
1da177e4 LT |
176 | return ERR_PTR(ret); |
177 | } | |
178 | ret = befs_btree_find(sb, ds, utfname, &offset); | |
179 | kfree(utfname); | |
180 | ||
181 | } else { | |
f7769f9c | 182 | ret = befs_btree_find(sb, ds, name, &offset); |
1da177e4 LT |
183 | } |
184 | ||
185 | if (ret == BEFS_BT_NOT_FOUND) { | |
a455589f | 186 | befs_debug(sb, "<--- %s %pd not found", __func__, dentry); |
a26bc1ad | 187 | d_add(dentry, NULL); |
1da177e4 LT |
188 | return ERR_PTR(-ENOENT); |
189 | ||
190 | } else if (ret != BEFS_OK || offset == 0) { | |
4c3897cc | 191 | befs_error(sb, "<--- %s Error", __func__); |
1da177e4 LT |
192 | return ERR_PTR(-ENODATA); |
193 | } | |
194 | ||
96eb5419 DH |
195 | inode = befs_iget(dir->i_sb, (ino_t) offset); |
196 | if (IS_ERR(inode)) | |
197 | return ERR_CAST(inode); | |
1da177e4 LT |
198 | |
199 | d_add(dentry, inode); | |
200 | ||
dac52fc1 | 201 | befs_debug(sb, "<--- %s", __func__); |
1da177e4 LT |
202 | |
203 | return NULL; | |
204 | } | |
205 | ||
206 | static int | |
f0f49ef5 | 207 | befs_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 208 | { |
f0f49ef5 | 209 | struct inode *inode = file_inode(file); |
1da177e4 | 210 | struct super_block *sb = inode->i_sb; |
22341d8f | 211 | const befs_data_stream *ds = &BEFS_I(inode)->i_data.ds; |
1da177e4 LT |
212 | befs_off_t value; |
213 | int result; | |
214 | size_t keysize; | |
1da177e4 | 215 | char keybuf[BEFS_NAME_LEN + 1]; |
1da177e4 | 216 | |
a455589f AV |
217 | befs_debug(sb, "---> %s name %pD, inode %ld, ctx->pos %lld", |
218 | __func__, file, inode->i_ino, ctx->pos); | |
1da177e4 | 219 | |
9ae51a32 LB |
220 | while (1) { |
221 | result = befs_btree_read(sb, ds, ctx->pos, BEFS_NAME_LEN + 1, | |
222 | keybuf, &keysize, &value); | |
1da177e4 | 223 | |
9ae51a32 | 224 | if (result == BEFS_ERR) { |
dac52fc1 | 225 | befs_debug(sb, "<--- %s ERROR", __func__); |
9ae51a32 LB |
226 | befs_error(sb, "IO error reading %pD (inode %lu)", |
227 | file, inode->i_ino); | |
228 | return -EIO; | |
1da177e4 | 229 | |
9ae51a32 LB |
230 | } else if (result == BEFS_BT_END) { |
231 | befs_debug(sb, "<--- %s END", __func__); | |
232 | return 0; | |
1da177e4 | 233 | |
9ae51a32 LB |
234 | } else if (result == BEFS_BT_EMPTY) { |
235 | befs_debug(sb, "<--- %s Empty directory", __func__); | |
236 | return 0; | |
1da177e4 | 237 | } |
9ae51a32 LB |
238 | |
239 | /* Convert to NLS */ | |
240 | if (BEFS_SB(sb)->nls) { | |
241 | char *nlsname; | |
242 | int nlsnamelen; | |
243 | ||
244 | result = | |
245 | befs_utf2nls(sb, keybuf, keysize, &nlsname, | |
246 | &nlsnamelen); | |
247 | if (result < 0) { | |
248 | befs_debug(sb, "<--- %s ERROR", __func__); | |
249 | return result; | |
250 | } | |
251 | if (!dir_emit(ctx, nlsname, nlsnamelen, | |
252 | (ino_t) value, DT_UNKNOWN)) { | |
253 | kfree(nlsname); | |
254 | return 0; | |
255 | } | |
f0f49ef5 | 256 | kfree(nlsname); |
9ae51a32 LB |
257 | } else { |
258 | if (!dir_emit(ctx, keybuf, keysize, | |
259 | (ino_t) value, DT_UNKNOWN)) | |
260 | return 0; | |
f0f49ef5 | 261 | } |
9ae51a32 | 262 | ctx->pos++; |
1da177e4 | 263 | } |
1da177e4 LT |
264 | } |
265 | ||
266 | static struct inode * | |
267 | befs_alloc_inode(struct super_block *sb) | |
268 | { | |
111d639d FF |
269 | struct befs_inode_info *bi; |
270 | ||
271 | bi = kmem_cache_alloc(befs_inode_cachep, GFP_KERNEL); | |
1da177e4 LT |
272 | if (!bi) |
273 | return NULL; | |
274 | return &bi->vfs_inode; | |
275 | } | |
276 | ||
fa0d7e3d | 277 | static void befs_i_callback(struct rcu_head *head) |
1da177e4 | 278 | { |
fa0d7e3d | 279 | struct inode *inode = container_of(head, struct inode, i_rcu); |
1da177e4 LT |
280 | kmem_cache_free(befs_inode_cachep, BEFS_I(inode)); |
281 | } | |
282 | ||
fa0d7e3d NP |
283 | static void befs_destroy_inode(struct inode *inode) |
284 | { | |
285 | call_rcu(&inode->i_rcu, befs_i_callback); | |
286 | } | |
287 | ||
51cc5068 | 288 | static void init_once(void *foo) |
1da177e4 LT |
289 | { |
290 | struct befs_inode_info *bi = (struct befs_inode_info *) foo; | |
a35afb83 CL |
291 | |
292 | inode_init_once(&bi->vfs_inode); | |
1da177e4 LT |
293 | } |
294 | ||
96eb5419 | 295 | static struct inode *befs_iget(struct super_block *sb, unsigned long ino) |
1da177e4 | 296 | { |
e4c7f5b1 | 297 | struct buffer_head *bh; |
44ad8098 | 298 | befs_inode *raw_inode; |
038428fc | 299 | struct befs_sb_info *befs_sb = BEFS_SB(sb); |
d6e02033 | 300 | struct befs_inode_info *befs_ino; |
96eb5419 | 301 | struct inode *inode; |
1da177e4 | 302 | |
dac52fc1 | 303 | befs_debug(sb, "---> %s inode = %lu", __func__, ino); |
96eb5419 DH |
304 | |
305 | inode = iget_locked(sb, ino); | |
ac34a1b3 RP |
306 | if (!inode) |
307 | return ERR_PTR(-ENOMEM); | |
96eb5419 DH |
308 | if (!(inode->i_state & I_NEW)) |
309 | return inode; | |
1da177e4 LT |
310 | |
311 | befs_ino = BEFS_I(inode); | |
312 | ||
313 | /* convert from vfs's inode number to befs's inode number */ | |
314 | befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino); | |
315 | ||
316 | befs_debug(sb, " real inode number [%u, %hu, %hu]", | |
317 | befs_ino->i_inode_num.allocation_group, | |
318 | befs_ino->i_inode_num.start, befs_ino->i_inode_num.len); | |
319 | ||
f7f67540 | 320 | bh = sb_bread(sb, inode->i_ino); |
1da177e4 LT |
321 | if (!bh) { |
322 | befs_error(sb, "unable to read inode block - " | |
323 | "inode = %lu", inode->i_ino); | |
0418726b | 324 | goto unacquire_none; |
1da177e4 LT |
325 | } |
326 | ||
327 | raw_inode = (befs_inode *) bh->b_data; | |
328 | ||
329 | befs_dump_inode(sb, raw_inode); | |
330 | ||
331 | if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) { | |
332 | befs_error(sb, "Bad inode: %lu", inode->i_ino); | |
0418726b | 333 | goto unacquire_bh; |
1da177e4 LT |
334 | } |
335 | ||
336 | inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode); | |
337 | ||
338 | /* | |
339 | * set uid and gid. But since current BeOS is single user OS, so | |
340 | * you can change by "uid" or "gid" options. | |
341 | */ | |
342 | ||
343 | inode->i_uid = befs_sb->mount_opts.use_uid ? | |
31aba059 EB |
344 | befs_sb->mount_opts.uid : |
345 | make_kuid(&init_user_ns, fs32_to_cpu(sb, raw_inode->uid)); | |
1da177e4 | 346 | inode->i_gid = befs_sb->mount_opts.use_gid ? |
31aba059 EB |
347 | befs_sb->mount_opts.gid : |
348 | make_kgid(&init_user_ns, fs32_to_cpu(sb, raw_inode->gid)); | |
1da177e4 | 349 | |
bfe86848 | 350 | set_nlink(inode, 1); |
1da177e4 LT |
351 | |
352 | /* | |
353 | * BEFS's time is 64 bits, but current VFS is 32 bits... | |
354 | * BEFS don't have access time. Nor inode change time. VFS | |
355 | * doesn't have creation time. | |
356 | * Also, the lower 16 bits of the last_modified_time and | |
357 | * create_time are just a counter to help ensure uniqueness | |
358 | * for indexing purposes. (PFD, page 54) | |
359 | */ | |
360 | ||
361 | inode->i_mtime.tv_sec = | |
362 | fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16; | |
363 | inode->i_mtime.tv_nsec = 0; /* lower 16 bits are not a time */ | |
364 | inode->i_ctime = inode->i_mtime; | |
365 | inode->i_atime = inode->i_mtime; | |
1da177e4 LT |
366 | |
367 | befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num); | |
368 | befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent); | |
369 | befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes); | |
370 | befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags); | |
371 | ||
372 | if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){ | |
373 | inode->i_size = 0; | |
374 | inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE; | |
39d7a29f FF |
375 | strlcpy(befs_ino->i_data.symlink, raw_inode->data.symlink, |
376 | BEFS_SYMLINK_LEN); | |
1da177e4 LT |
377 | } else { |
378 | int num_blks; | |
379 | ||
380 | befs_ino->i_data.ds = | |
e0e3d32b | 381 | fsds_to_cpu(sb, &raw_inode->data.datastream); |
1da177e4 LT |
382 | |
383 | num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds); | |
384 | inode->i_blocks = | |
385 | num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE); | |
386 | inode->i_size = befs_ino->i_data.ds.size; | |
387 | } | |
388 | ||
389 | inode->i_mapping->a_ops = &befs_aops; | |
390 | ||
391 | if (S_ISREG(inode->i_mode)) { | |
2cf06916 | 392 | inode->i_fop = &generic_ro_fops; |
1da177e4 LT |
393 | } else if (S_ISDIR(inode->i_mode)) { |
394 | inode->i_op = &befs_dir_inode_operations; | |
395 | inode->i_fop = &befs_dir_operations; | |
396 | } else if (S_ISLNK(inode->i_mode)) { | |
d0deec19 | 397 | if (befs_ino->i_flags & BEFS_LONG_SYMLINK) { |
11803f97 | 398 | inode->i_op = &page_symlink_inode_operations; |
21fc61c7 | 399 | inode_nohighmem(inode); |
11803f97 | 400 | inode->i_mapping->a_ops = &befs_symlink_aops; |
d0deec19 AV |
401 | } else { |
402 | inode->i_link = befs_ino->i_data.symlink; | |
403 | inode->i_op = &simple_symlink_inode_operations; | |
404 | } | |
1da177e4 LT |
405 | } else { |
406 | befs_error(sb, "Inode %lu is not a regular file, " | |
407 | "directory or symlink. THAT IS WRONG! BeFS has no " | |
408 | "on disk special files", inode->i_ino); | |
0418726b | 409 | goto unacquire_bh; |
1da177e4 LT |
410 | } |
411 | ||
412 | brelse(bh); | |
dac52fc1 | 413 | befs_debug(sb, "<--- %s", __func__); |
96eb5419 DH |
414 | unlock_new_inode(inode); |
415 | return inode; | |
1da177e4 | 416 | |
0418726b | 417 | unacquire_bh: |
1da177e4 LT |
418 | brelse(bh); |
419 | ||
0418726b | 420 | unacquire_none: |
96eb5419 | 421 | iget_failed(inode); |
dac52fc1 | 422 | befs_debug(sb, "<--- %s - Bad inode", __func__); |
33c712b4 | 423 | return ERR_PTR(-EIO); |
1da177e4 LT |
424 | } |
425 | ||
426 | /* Initialize the inode cache. Called at fs setup. | |
20c2df83 | 427 | * |
1da177e4 LT |
428 | * Taken from NFS implementation by Al Viro. |
429 | */ | |
91a52ab7 | 430 | static int __init |
1da177e4 LT |
431 | befs_init_inodecache(void) |
432 | { | |
433 | befs_inode_cachep = kmem_cache_create("befs_inode_cache", | |
434 | sizeof (struct befs_inode_info), | |
fffb60f9 | 435 | 0, (SLAB_RECLAIM_ACCOUNT| |
5d097056 | 436 | SLAB_MEM_SPREAD|SLAB_ACCOUNT), |
20c2df83 | 437 | init_once); |
c08f1cb6 | 438 | if (befs_inode_cachep == NULL) |
1da177e4 | 439 | return -ENOMEM; |
c08f1cb6 | 440 | |
1da177e4 LT |
441 | return 0; |
442 | } | |
443 | ||
444 | /* Called at fs teardown. | |
445 | * | |
446 | * Taken from NFS implementation by Al Viro. | |
447 | */ | |
448 | static void | |
449 | befs_destroy_inodecache(void) | |
450 | { | |
8c0a8537 KS |
451 | /* |
452 | * Make sure all delayed rcu free inodes are flushed before we | |
453 | * destroy cache. | |
454 | */ | |
455 | rcu_barrier(); | |
1a1d92c1 | 456 | kmem_cache_destroy(befs_inode_cachep); |
1da177e4 LT |
457 | } |
458 | ||
459 | /* | |
460 | * The inode of symbolic link is different to data stream. | |
461 | * The data stream become link name. Unless the LONG_SYMLINK | |
462 | * flag is set. | |
463 | */ | |
11803f97 | 464 | static int befs_symlink_readpage(struct file *unused, struct page *page) |
1da177e4 | 465 | { |
11803f97 AV |
466 | struct inode *inode = page->mapping->host; |
467 | struct super_block *sb = inode->i_sb; | |
468 | struct befs_inode_info *befs_ino = BEFS_I(inode); | |
48bc06e7 AV |
469 | befs_data_stream *data = &befs_ino->i_data.ds; |
470 | befs_off_t len = data->size; | |
21fc61c7 | 471 | char *link = page_address(page); |
1da177e4 | 472 | |
11803f97 | 473 | if (len == 0 || len > PAGE_SIZE) { |
48bc06e7 | 474 | befs_error(sb, "Long symlink with illegal length"); |
11803f97 | 475 | goto fail; |
1da177e4 | 476 | } |
680baacb AV |
477 | befs_debug(sb, "Follow long symlink"); |
478 | ||
680baacb | 479 | if (befs_read_lsymlink(sb, data, link, len) != len) { |
680baacb | 480 | befs_error(sb, "Failed to read entire long symlink"); |
11803f97 | 481 | goto fail; |
680baacb AV |
482 | } |
483 | link[len - 1] = '\0'; | |
11803f97 | 484 | SetPageUptodate(page); |
11803f97 AV |
485 | unlock_page(page); |
486 | return 0; | |
487 | fail: | |
488 | SetPageError(page); | |
11803f97 AV |
489 | unlock_page(page); |
490 | return -EIO; | |
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) { | |
1da177e4 LT |
525 | return -ENOMEM; |
526 | } | |
527 | ||
528 | for (i = o = 0; i < in_len; i += utflen, o += unilen) { | |
529 | ||
530 | /* convert from UTF-8 to Unicode */ | |
74675a58 AS |
531 | utflen = utf8_to_utf32(&in[i], in_len - i, &uni); |
532 | if (utflen < 0) | |
1da177e4 | 533 | goto conv_err; |
1da177e4 LT |
534 | |
535 | /* convert from Unicode to nls */ | |
74675a58 AS |
536 | if (uni > MAX_WCHAR_T) |
537 | goto conv_err; | |
1da177e4 | 538 | unilen = nls->uni2char(uni, &result[o], in_len - o); |
74675a58 | 539 | if (unilen < 0) |
1da177e4 | 540 | goto conv_err; |
1da177e4 LT |
541 | } |
542 | result[o] = '\0'; | |
543 | *out_len = o; | |
544 | ||
dac52fc1 | 545 | befs_debug(sb, "<--- %s", __func__); |
1da177e4 LT |
546 | |
547 | return o; | |
548 | ||
549 | conv_err: | |
550 | befs_error(sb, "Name using character set %s contains a character that " | |
551 | "cannot be converted to unicode.", nls->charset); | |
dac52fc1 | 552 | befs_debug(sb, "<--- %s", __func__); |
1da177e4 LT |
553 | kfree(result); |
554 | return -EILSEQ; | |
555 | } | |
556 | ||
557 | /** | |
558 | * befs_nls2utf - Convert NLS string to utf8 encodeing | |
559 | * @sb: Superblock | |
817e1d90 FF |
560 | * @in: Input string buffer in NLS format |
561 | * @in_len: Length of input string in bytes | |
562 | * @out: The output string in UTF-8 format | |
563 | * @out_len: Length of the output buffer | |
1da177e4 | 564 | * |
817e1d90 | 565 | * Converts input string @in, which is in the format of the loaded NLS map, |
1da177e4 LT |
566 | * into a utf8 string. |
567 | * | |
817e1d90 | 568 | * The destination string @out is allocated by this function and the caller is |
1da177e4 LT |
569 | * responsible for freeing it with kfree() |
570 | * | |
817e1d90 | 571 | * On return, *@out_len is the length of @out in bytes. |
1da177e4 LT |
572 | * |
573 | * On success, the return value is the number of utf8 characters written to | |
817e1d90 | 574 | * the output buffer @out. |
1da177e4 LT |
575 | * |
576 | * On Failure, a negative number coresponding to the error code is returned. | |
577 | */ | |
578 | ||
579 | static int | |
580 | befs_nls2utf(struct super_block *sb, const char *in, | |
581 | int in_len, char **out, int *out_len) | |
582 | { | |
583 | struct nls_table *nls = BEFS_SB(sb)->nls; | |
584 | int i, o; | |
585 | wchar_t uni; | |
586 | int unilen, utflen; | |
587 | char *result; | |
94f563c4 DC |
588 | /* There're nls characters that will translate to 3-chars-wide UTF-8 |
589 | * characters, a additional byte is needed to save the final \0 | |
590 | * in special cases */ | |
591 | int maxlen = (3 * in_len) + 1; | |
1da177e4 | 592 | |
dac52fc1 | 593 | befs_debug(sb, "---> %s\n", __func__); |
1da177e4 LT |
594 | |
595 | if (!nls) { | |
dac52fc1 FF |
596 | befs_error(sb, "%s called with no NLS table loaded.", |
597 | __func__); | |
1da177e4 LT |
598 | return -EINVAL; |
599 | } | |
600 | ||
601 | *out = result = kmalloc(maxlen, GFP_NOFS); | |
602 | if (!*out) { | |
1da177e4 LT |
603 | *out_len = 0; |
604 | return -ENOMEM; | |
605 | } | |
606 | ||
607 | for (i = o = 0; i < in_len; i += unilen, o += utflen) { | |
608 | ||
609 | /* convert from nls to unicode */ | |
610 | unilen = nls->char2uni(&in[i], in_len - i, &uni); | |
74675a58 | 611 | if (unilen < 0) |
1da177e4 | 612 | goto conv_err; |
1da177e4 LT |
613 | |
614 | /* convert from unicode to UTF-8 */ | |
74675a58 AS |
615 | utflen = utf32_to_utf8(uni, &result[o], 3); |
616 | if (utflen <= 0) | |
1da177e4 | 617 | goto conv_err; |
1da177e4 LT |
618 | } |
619 | ||
620 | result[o] = '\0'; | |
621 | *out_len = o; | |
622 | ||
dac52fc1 | 623 | befs_debug(sb, "<--- %s", __func__); |
1da177e4 LT |
624 | |
625 | return i; | |
626 | ||
627 | conv_err: | |
628 | befs_error(sb, "Name using charecter set %s contains a charecter that " | |
629 | "cannot be converted to unicode.", nls->charset); | |
dac52fc1 | 630 | befs_debug(sb, "<--- %s", __func__); |
1da177e4 LT |
631 | kfree(result); |
632 | return -EILSEQ; | |
633 | } | |
634 | ||
1da177e4 LT |
635 | enum { |
636 | Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err, | |
637 | }; | |
638 | ||
a447c093 | 639 | static const match_table_t befs_tokens = { |
1da177e4 LT |
640 | {Opt_uid, "uid=%d"}, |
641 | {Opt_gid, "gid=%d"}, | |
642 | {Opt_charset, "iocharset=%s"}, | |
643 | {Opt_debug, "debug"}, | |
644 | {Opt_err, NULL} | |
645 | }; | |
646 | ||
647 | static int | |
09ad0eae | 648 | parse_options(char *options, struct befs_mount_options *opts) |
1da177e4 LT |
649 | { |
650 | char *p; | |
651 | substring_t args[MAX_OPT_ARGS]; | |
652 | int option; | |
31aba059 EB |
653 | kuid_t uid; |
654 | kgid_t gid; | |
1da177e4 LT |
655 | |
656 | /* Initialize options */ | |
31aba059 EB |
657 | opts->uid = GLOBAL_ROOT_UID; |
658 | opts->gid = GLOBAL_ROOT_GID; | |
1da177e4 LT |
659 | opts->use_uid = 0; |
660 | opts->use_gid = 0; | |
661 | opts->iocharset = NULL; | |
662 | opts->debug = 0; | |
663 | ||
664 | if (!options) | |
665 | return 1; | |
666 | ||
667 | while ((p = strsep(&options, ",")) != NULL) { | |
668 | int token; | |
669 | if (!*p) | |
670 | continue; | |
671 | ||
672 | token = match_token(p, befs_tokens, args); | |
673 | switch (token) { | |
674 | case Opt_uid: | |
675 | if (match_int(&args[0], &option)) | |
676 | return 0; | |
31aba059 EB |
677 | uid = INVALID_UID; |
678 | if (option >= 0) | |
679 | uid = make_kuid(current_user_ns(), option); | |
680 | if (!uid_valid(uid)) { | |
dac52fc1 FF |
681 | pr_err("Invalid uid %d, " |
682 | "using default\n", option); | |
1da177e4 LT |
683 | break; |
684 | } | |
31aba059 | 685 | opts->uid = uid; |
1da177e4 LT |
686 | opts->use_uid = 1; |
687 | break; | |
688 | case Opt_gid: | |
689 | if (match_int(&args[0], &option)) | |
690 | return 0; | |
31aba059 EB |
691 | gid = INVALID_GID; |
692 | if (option >= 0) | |
693 | gid = make_kgid(current_user_ns(), option); | |
694 | if (!gid_valid(gid)) { | |
dac52fc1 FF |
695 | pr_err("Invalid gid %d, " |
696 | "using default\n", option); | |
1da177e4 LT |
697 | break; |
698 | } | |
31aba059 | 699 | opts->gid = gid; |
1da177e4 LT |
700 | opts->use_gid = 1; |
701 | break; | |
702 | case Opt_charset: | |
703 | kfree(opts->iocharset); | |
704 | opts->iocharset = match_strdup(&args[0]); | |
705 | if (!opts->iocharset) { | |
dac52fc1 FF |
706 | pr_err("allocation failure for " |
707 | "iocharset string\n"); | |
1da177e4 LT |
708 | return 0; |
709 | } | |
710 | break; | |
711 | case Opt_debug: | |
712 | opts->debug = 1; | |
713 | break; | |
714 | default: | |
dac52fc1 FF |
715 | pr_err("Unrecognized mount option \"%s\" " |
716 | "or missing value\n", p); | |
1da177e4 LT |
717 | return 0; |
718 | } | |
719 | } | |
720 | return 1; | |
721 | } | |
722 | ||
723 | /* This function has the responsibiltiy of getting the | |
724 | * filesystem ready for unmounting. | |
25985edc | 725 | * Basically, we free everything that we allocated in |
1da177e4 LT |
726 | * befs_read_inode |
727 | */ | |
728 | static void | |
729 | befs_put_super(struct super_block *sb) | |
730 | { | |
f99d49ad JJ |
731 | kfree(BEFS_SB(sb)->mount_opts.iocharset); |
732 | BEFS_SB(sb)->mount_opts.iocharset = NULL; | |
6d729e44 | 733 | unload_nls(BEFS_SB(sb)->nls); |
f99d49ad JJ |
734 | kfree(sb->s_fs_info); |
735 | sb->s_fs_info = NULL; | |
1da177e4 LT |
736 | } |
737 | ||
738 | /* Allocate private field of the superblock, fill it. | |
739 | * | |
740 | * Finish filling the public superblock fields | |
741 | * Make the root directory | |
742 | * Load a set of NLS translations if needed. | |
743 | */ | |
744 | static int | |
745 | befs_fill_super(struct super_block *sb, void *data, int silent) | |
746 | { | |
747 | struct buffer_head *bh; | |
038428fc | 748 | struct befs_sb_info *befs_sb; |
1da177e4 LT |
749 | befs_super_block *disk_sb; |
750 | struct inode *root; | |
96eb5419 | 751 | long ret = -EINVAL; |
1da177e4 LT |
752 | const unsigned long sb_block = 0; |
753 | const off_t x86_sb_off = 512; | |
173b066f | 754 | int blocksize; |
1da177e4 | 755 | |
552c3c6c MS |
756 | save_mount_options(sb, data); |
757 | ||
2d4319ef | 758 | sb->s_fs_info = kzalloc(sizeof(*befs_sb), GFP_KERNEL); |
c625426f | 759 | if (sb->s_fs_info == NULL) |
0418726b | 760 | goto unacquire_none; |
c625426f | 761 | |
1da177e4 | 762 | befs_sb = BEFS_SB(sb); |
1da177e4 LT |
763 | |
764 | if (!parse_options((char *) data, &befs_sb->mount_opts)) { | |
dceee2e2 ST |
765 | if (!silent) |
766 | befs_error(sb, "cannot parse mount options"); | |
0418726b | 767 | goto unacquire_priv_sbp; |
1da177e4 LT |
768 | } |
769 | ||
dac52fc1 | 770 | befs_debug(sb, "---> %s", __func__); |
1da177e4 | 771 | |
1da177e4 LT |
772 | if (!(sb->s_flags & MS_RDONLY)) { |
773 | befs_warning(sb, | |
774 | "No write support. Marking filesystem read-only"); | |
775 | sb->s_flags |= MS_RDONLY; | |
776 | } | |
1da177e4 LT |
777 | |
778 | /* | |
779 | * Set dummy blocksize to read super block. | |
780 | * Will be set to real fs blocksize later. | |
781 | * | |
782 | * Linux 2.4.10 and later refuse to read blocks smaller than | |
a441b0d0 | 783 | * the logical block size for the device. But we also need to read at |
1da177e4 LT |
784 | * least 1k to get the second 512 bytes of the volume. |
785 | * -WD 10-26-01 | |
786 | */ | |
173b066f LB |
787 | blocksize = sb_min_blocksize(sb, 1024); |
788 | if (!blocksize) { | |
a6499850 LB |
789 | if (!silent) |
790 | befs_error(sb, "unable to set blocksize"); | |
173b066f LB |
791 | goto unacquire_priv_sbp; |
792 | } | |
1da177e4 LT |
793 | |
794 | if (!(bh = sb_bread(sb, sb_block))) { | |
dceee2e2 ST |
795 | if (!silent) |
796 | befs_error(sb, "unable to read superblock"); | |
0418726b | 797 | goto unacquire_priv_sbp; |
1da177e4 LT |
798 | } |
799 | ||
800 | /* account for offset of super block on x86 */ | |
801 | disk_sb = (befs_super_block *) bh->b_data; | |
152b95a1 HH |
802 | if ((disk_sb->magic1 == BEFS_SUPER_MAGIC1_LE) || |
803 | (disk_sb->magic1 == BEFS_SUPER_MAGIC1_BE)) { | |
1da177e4 LT |
804 | befs_debug(sb, "Using PPC superblock location"); |
805 | } else { | |
806 | befs_debug(sb, "Using x86 superblock location"); | |
807 | disk_sb = | |
808 | (befs_super_block *) ((void *) bh->b_data + x86_sb_off); | |
809 | } | |
810 | ||
8e19189e FF |
811 | if ((befs_load_sb(sb, disk_sb) != BEFS_OK) || |
812 | (befs_check_sb(sb) != BEFS_OK)) | |
0418726b | 813 | goto unacquire_bh; |
1da177e4 LT |
814 | |
815 | befs_dump_super_block(sb, disk_sb); | |
816 | ||
817 | brelse(bh); | |
818 | ||
1da177e4 | 819 | if( befs_sb->num_blocks > ~((sector_t)0) ) { |
dceee2e2 ST |
820 | if (!silent) |
821 | befs_error(sb, "blocks count: %llu is larger than the host can use", | |
822 | befs_sb->num_blocks); | |
0418726b | 823 | goto unacquire_priv_sbp; |
1da177e4 LT |
824 | } |
825 | ||
826 | /* | |
827 | * set up enough so that it can read an inode | |
828 | * Fill in kernel superblock fields from private sb | |
829 | */ | |
830 | sb->s_magic = BEFS_SUPER_MAGIC; | |
831 | /* Set real blocksize of fs */ | |
832 | sb_set_blocksize(sb, (ulong) befs_sb->block_size); | |
b87221de | 833 | sb->s_op = &befs_sops; |
96eb5419 DH |
834 | root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir))); |
835 | if (IS_ERR(root)) { | |
836 | ret = PTR_ERR(root); | |
837 | goto unacquire_priv_sbp; | |
838 | } | |
48fde701 | 839 | sb->s_root = d_make_root(root); |
1da177e4 | 840 | if (!sb->s_root) { |
dceee2e2 ST |
841 | if (!silent) |
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 | 870 | kfree(sb->s_fs_info); |
30982583 | 871 | sb->s_fs_info = NULL; |
1da177e4 | 872 | |
0418726b | 873 | unacquire_none: |
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) |