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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> |
5b825c3a | 21 | #include <linux/cred.h> |
ac632f5b | 22 | #include <linux/exportfs.h> |
1da177e4 LT |
23 | |
24 | #include "befs.h" | |
25 | #include "btree.h" | |
26 | #include "inode.h" | |
27 | #include "datastream.h" | |
28 | #include "super.h" | |
29 | #include "io.h" | |
1da177e4 LT |
30 | |
31 | MODULE_DESCRIPTION("BeOS File System (BeFS) driver"); | |
32 | MODULE_AUTHOR("Will Dyson"); | |
33 | MODULE_LICENSE("GPL"); | |
34 | ||
35 | /* The units the vfs expects inode->i_blocks to be in */ | |
36 | #define VFS_BLOCK_SIZE 512 | |
37 | ||
f0f49ef5 | 38 | static int befs_readdir(struct file *, struct dir_context *); |
1da177e4 LT |
39 | static int befs_get_block(struct inode *, sector_t, struct buffer_head *, int); |
40 | static int befs_readpage(struct file *file, struct page *page); | |
41 | static sector_t befs_bmap(struct address_space *mapping, sector_t block); | |
62b80719 LB |
42 | static struct dentry *befs_lookup(struct inode *, struct dentry *, |
43 | unsigned int); | |
96eb5419 | 44 | static struct inode *befs_iget(struct super_block *, unsigned long); |
1da177e4 LT |
45 | static struct inode *befs_alloc_inode(struct super_block *sb); |
46 | static void befs_destroy_inode(struct inode *inode); | |
1da177e4 | 47 | static void befs_destroy_inodecache(void); |
11803f97 | 48 | static int befs_symlink_readpage(struct file *, struct page *); |
1da177e4 LT |
49 | static int befs_utf2nls(struct super_block *sb, const char *in, int in_len, |
50 | char **out, int *out_len); | |
51 | static int befs_nls2utf(struct super_block *sb, const char *in, int in_len, | |
52 | char **out, int *out_len); | |
53 | static void befs_put_super(struct super_block *); | |
54 | static int befs_remount(struct super_block *, int *, char *); | |
726c3342 | 55 | static int befs_statfs(struct dentry *, struct kstatfs *); |
09ad0eae | 56 | static int parse_options(char *, struct befs_mount_options *); |
ac632f5b LB |
57 | static struct dentry *befs_fh_to_dentry(struct super_block *sb, |
58 | struct fid *fid, int fh_len, int fh_type); | |
59 | static struct dentry *befs_fh_to_parent(struct super_block *sb, | |
60 | struct fid *fid, int fh_len, int fh_type); | |
1da177e4 LT |
61 | |
62 | static const struct super_operations befs_sops = { | |
1da177e4 LT |
63 | .alloc_inode = befs_alloc_inode, /* allocate a new inode */ |
64 | .destroy_inode = befs_destroy_inode, /* deallocate an inode */ | |
65 | .put_super = befs_put_super, /* uninit super */ | |
66 | .statfs = befs_statfs, /* statfs */ | |
67 | .remount_fs = befs_remount, | |
552c3c6c | 68 | .show_options = generic_show_options, |
1da177e4 LT |
69 | }; |
70 | ||
71 | /* slab cache for befs_inode_info objects */ | |
e18b890b | 72 | static struct kmem_cache *befs_inode_cachep; |
1da177e4 | 73 | |
4b6f5d20 | 74 | static const struct file_operations befs_dir_operations = { |
1da177e4 | 75 | .read = generic_read_dir, |
e23e9aa7 | 76 | .iterate_shared = befs_readdir, |
59af1584 | 77 | .llseek = generic_file_llseek, |
1da177e4 LT |
78 | }; |
79 | ||
754661f1 | 80 | static const struct inode_operations befs_dir_inode_operations = { |
1da177e4 LT |
81 | .lookup = befs_lookup, |
82 | }; | |
83 | ||
f5e54d6e | 84 | static const struct address_space_operations befs_aops = { |
1da177e4 | 85 | .readpage = befs_readpage, |
1da177e4 LT |
86 | .bmap = befs_bmap, |
87 | }; | |
88 | ||
11803f97 AV |
89 | static const struct address_space_operations befs_symlink_aops = { |
90 | .readpage = befs_symlink_readpage, | |
1da177e4 LT |
91 | }; |
92 | ||
ac632f5b LB |
93 | static const struct export_operations befs_export_operations = { |
94 | .fh_to_dentry = befs_fh_to_dentry, | |
95 | .fh_to_parent = befs_fh_to_parent, | |
96 | }; | |
97 | ||
e60f749b | 98 | /* |
1da177e4 | 99 | * Called by generic_file_read() to read a page of data |
e60f749b | 100 | * |
1da177e4 LT |
101 | * In turn, simply calls a generic block read function and |
102 | * passes it the address of befs_get_block, for mapping file | |
103 | * positions to disk blocks. | |
104 | */ | |
105 | static int | |
106 | befs_readpage(struct file *file, struct page *page) | |
107 | { | |
108 | return block_read_full_page(page, befs_get_block); | |
109 | } | |
110 | ||
111 | static sector_t | |
112 | befs_bmap(struct address_space *mapping, sector_t block) | |
113 | { | |
114 | return generic_block_bmap(mapping, block, befs_get_block); | |
115 | } | |
116 | ||
e60f749b LB |
117 | /* |
118 | * Generic function to map a file position (block) to a | |
1da177e4 LT |
119 | * disk offset (passed back in bh_result). |
120 | * | |
121 | * Used by many higher level functions. | |
122 | * | |
123 | * Calls befs_fblock2brun() in datastream.c to do the real work. | |
1da177e4 LT |
124 | */ |
125 | ||
126 | static int | |
127 | befs_get_block(struct inode *inode, sector_t block, | |
128 | struct buffer_head *bh_result, int create) | |
129 | { | |
130 | struct super_block *sb = inode->i_sb; | |
131 | befs_data_stream *ds = &BEFS_I(inode)->i_data.ds; | |
132 | befs_block_run run = BAD_IADDR; | |
abcf9116 | 133 | int res; |
1da177e4 LT |
134 | ulong disk_off; |
135 | ||
136 | befs_debug(sb, "---> befs_get_block() for inode %lu, block %ld", | |
dac52fc1 | 137 | (unsigned long)inode->i_ino, (long)block); |
1da177e4 LT |
138 | if (create) { |
139 | befs_error(sb, "befs_get_block() was asked to write to " | |
dac52fc1 FF |
140 | "block %ld in inode %lu", (long)block, |
141 | (unsigned long)inode->i_ino); | |
1da177e4 LT |
142 | return -EPERM; |
143 | } | |
144 | ||
145 | res = befs_fblock2brun(sb, ds, block, &run); | |
146 | if (res != BEFS_OK) { | |
147 | befs_error(sb, | |
dac52fc1 FF |
148 | "<--- %s for inode %lu, block %ld ERROR", |
149 | __func__, (unsigned long)inode->i_ino, | |
150 | (long)block); | |
1da177e4 LT |
151 | return -EFBIG; |
152 | } | |
153 | ||
154 | disk_off = (ulong) iaddr2blockno(sb, &run); | |
155 | ||
156 | map_bh(bh_result, inode->i_sb, disk_off); | |
157 | ||
dac52fc1 FF |
158 | befs_debug(sb, "<--- %s for inode %lu, block %ld, disk address %lu", |
159 | __func__, (unsigned long)inode->i_ino, (long)block, | |
160 | (unsigned long)disk_off); | |
1da177e4 LT |
161 | |
162 | return 0; | |
163 | } | |
164 | ||
165 | static struct dentry * | |
00cd8dd3 | 166 | befs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) |
1da177e4 | 167 | { |
c9408763 | 168 | struct inode *inode; |
1da177e4 | 169 | struct super_block *sb = dir->i_sb; |
22341d8f | 170 | const befs_data_stream *ds = &BEFS_I(dir)->i_data.ds; |
1da177e4 LT |
171 | befs_off_t offset; |
172 | int ret; | |
173 | int utfnamelen; | |
174 | char *utfname; | |
175 | const char *name = dentry->d_name.name; | |
176 | ||
a455589f AV |
177 | befs_debug(sb, "---> %s name %pd inode %ld", __func__, |
178 | dentry, dir->i_ino); | |
1da177e4 LT |
179 | |
180 | /* Convert to UTF-8 */ | |
181 | if (BEFS_SB(sb)->nls) { | |
182 | ret = | |
183 | befs_nls2utf(sb, name, strlen(name), &utfname, &utfnamelen); | |
184 | if (ret < 0) { | |
dac52fc1 | 185 | befs_debug(sb, "<--- %s ERROR", __func__); |
1da177e4 LT |
186 | return ERR_PTR(ret); |
187 | } | |
188 | ret = befs_btree_find(sb, ds, utfname, &offset); | |
189 | kfree(utfname); | |
190 | ||
191 | } else { | |
f7769f9c | 192 | ret = befs_btree_find(sb, ds, name, &offset); |
1da177e4 LT |
193 | } |
194 | ||
195 | if (ret == BEFS_BT_NOT_FOUND) { | |
a455589f | 196 | befs_debug(sb, "<--- %s %pd not found", __func__, dentry); |
a26bc1ad | 197 | d_add(dentry, NULL); |
1da177e4 LT |
198 | return ERR_PTR(-ENOENT); |
199 | ||
200 | } else if (ret != BEFS_OK || offset == 0) { | |
4c3897cc | 201 | befs_error(sb, "<--- %s Error", __func__); |
1da177e4 LT |
202 | return ERR_PTR(-ENODATA); |
203 | } | |
204 | ||
96eb5419 DH |
205 | inode = befs_iget(dir->i_sb, (ino_t) offset); |
206 | if (IS_ERR(inode)) | |
207 | return ERR_CAST(inode); | |
1da177e4 LT |
208 | |
209 | d_add(dentry, inode); | |
210 | ||
dac52fc1 | 211 | befs_debug(sb, "<--- %s", __func__); |
1da177e4 LT |
212 | |
213 | return NULL; | |
214 | } | |
215 | ||
216 | static int | |
f0f49ef5 | 217 | befs_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 218 | { |
f0f49ef5 | 219 | struct inode *inode = file_inode(file); |
1da177e4 | 220 | struct super_block *sb = inode->i_sb; |
22341d8f | 221 | const befs_data_stream *ds = &BEFS_I(inode)->i_data.ds; |
1da177e4 LT |
222 | befs_off_t value; |
223 | int result; | |
224 | size_t keysize; | |
1da177e4 | 225 | char keybuf[BEFS_NAME_LEN + 1]; |
1da177e4 | 226 | |
a455589f AV |
227 | befs_debug(sb, "---> %s name %pD, inode %ld, ctx->pos %lld", |
228 | __func__, file, inode->i_ino, ctx->pos); | |
1da177e4 | 229 | |
9ae51a32 LB |
230 | while (1) { |
231 | result = befs_btree_read(sb, ds, ctx->pos, BEFS_NAME_LEN + 1, | |
232 | keybuf, &keysize, &value); | |
1da177e4 | 233 | |
9ae51a32 | 234 | if (result == BEFS_ERR) { |
dac52fc1 | 235 | befs_debug(sb, "<--- %s ERROR", __func__); |
9ae51a32 LB |
236 | befs_error(sb, "IO error reading %pD (inode %lu)", |
237 | file, inode->i_ino); | |
238 | return -EIO; | |
1da177e4 | 239 | |
9ae51a32 LB |
240 | } else if (result == BEFS_BT_END) { |
241 | befs_debug(sb, "<--- %s END", __func__); | |
242 | return 0; | |
1da177e4 | 243 | |
9ae51a32 LB |
244 | } else if (result == BEFS_BT_EMPTY) { |
245 | befs_debug(sb, "<--- %s Empty directory", __func__); | |
246 | return 0; | |
1da177e4 | 247 | } |
9ae51a32 LB |
248 | |
249 | /* Convert to NLS */ | |
250 | if (BEFS_SB(sb)->nls) { | |
251 | char *nlsname; | |
252 | int nlsnamelen; | |
253 | ||
254 | result = | |
255 | befs_utf2nls(sb, keybuf, keysize, &nlsname, | |
256 | &nlsnamelen); | |
257 | if (result < 0) { | |
258 | befs_debug(sb, "<--- %s ERROR", __func__); | |
259 | return result; | |
260 | } | |
261 | if (!dir_emit(ctx, nlsname, nlsnamelen, | |
262 | (ino_t) value, DT_UNKNOWN)) { | |
263 | kfree(nlsname); | |
264 | return 0; | |
265 | } | |
f0f49ef5 | 266 | kfree(nlsname); |
9ae51a32 LB |
267 | } else { |
268 | if (!dir_emit(ctx, keybuf, keysize, | |
269 | (ino_t) value, DT_UNKNOWN)) | |
270 | return 0; | |
f0f49ef5 | 271 | } |
9ae51a32 | 272 | ctx->pos++; |
1da177e4 | 273 | } |
1da177e4 LT |
274 | } |
275 | ||
276 | static struct inode * | |
277 | befs_alloc_inode(struct super_block *sb) | |
278 | { | |
111d639d FF |
279 | struct befs_inode_info *bi; |
280 | ||
281 | bi = kmem_cache_alloc(befs_inode_cachep, GFP_KERNEL); | |
62b80719 LB |
282 | if (!bi) |
283 | return NULL; | |
284 | return &bi->vfs_inode; | |
1da177e4 LT |
285 | } |
286 | ||
fa0d7e3d | 287 | static void befs_i_callback(struct rcu_head *head) |
1da177e4 | 288 | { |
fa0d7e3d | 289 | struct inode *inode = container_of(head, struct inode, i_rcu); |
62b80719 | 290 | kmem_cache_free(befs_inode_cachep, BEFS_I(inode)); |
1da177e4 LT |
291 | } |
292 | ||
fa0d7e3d NP |
293 | static void befs_destroy_inode(struct inode *inode) |
294 | { | |
295 | call_rcu(&inode->i_rcu, befs_i_callback); | |
296 | } | |
297 | ||
51cc5068 | 298 | static void init_once(void *foo) |
1da177e4 | 299 | { |
62b80719 | 300 | struct befs_inode_info *bi = (struct befs_inode_info *) foo; |
a35afb83 CL |
301 | |
302 | inode_init_once(&bi->vfs_inode); | |
1da177e4 LT |
303 | } |
304 | ||
96eb5419 | 305 | static struct inode *befs_iget(struct super_block *sb, unsigned long ino) |
1da177e4 | 306 | { |
e4c7f5b1 | 307 | struct buffer_head *bh; |
44ad8098 | 308 | befs_inode *raw_inode; |
038428fc | 309 | struct befs_sb_info *befs_sb = BEFS_SB(sb); |
d6e02033 | 310 | struct befs_inode_info *befs_ino; |
96eb5419 | 311 | struct inode *inode; |
1da177e4 | 312 | |
dac52fc1 | 313 | befs_debug(sb, "---> %s inode = %lu", __func__, ino); |
96eb5419 DH |
314 | |
315 | inode = iget_locked(sb, ino); | |
ac34a1b3 RP |
316 | if (!inode) |
317 | return ERR_PTR(-ENOMEM); | |
96eb5419 DH |
318 | if (!(inode->i_state & I_NEW)) |
319 | return inode; | |
1da177e4 LT |
320 | |
321 | befs_ino = BEFS_I(inode); | |
322 | ||
323 | /* convert from vfs's inode number to befs's inode number */ | |
324 | befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino); | |
325 | ||
326 | befs_debug(sb, " real inode number [%u, %hu, %hu]", | |
327 | befs_ino->i_inode_num.allocation_group, | |
328 | befs_ino->i_inode_num.start, befs_ino->i_inode_num.len); | |
329 | ||
f7f67540 | 330 | bh = sb_bread(sb, inode->i_ino); |
1da177e4 LT |
331 | if (!bh) { |
332 | befs_error(sb, "unable to read inode block - " | |
333 | "inode = %lu", inode->i_ino); | |
0418726b | 334 | goto unacquire_none; |
1da177e4 LT |
335 | } |
336 | ||
337 | raw_inode = (befs_inode *) bh->b_data; | |
338 | ||
339 | befs_dump_inode(sb, raw_inode); | |
340 | ||
341 | if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) { | |
342 | befs_error(sb, "Bad inode: %lu", inode->i_ino); | |
0418726b | 343 | goto unacquire_bh; |
1da177e4 LT |
344 | } |
345 | ||
346 | inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode); | |
347 | ||
348 | /* | |
349 | * set uid and gid. But since current BeOS is single user OS, so | |
350 | * you can change by "uid" or "gid" options. | |
e60f749b | 351 | */ |
1da177e4 LT |
352 | |
353 | inode->i_uid = befs_sb->mount_opts.use_uid ? | |
31aba059 EB |
354 | befs_sb->mount_opts.uid : |
355 | make_kuid(&init_user_ns, fs32_to_cpu(sb, raw_inode->uid)); | |
1da177e4 | 356 | inode->i_gid = befs_sb->mount_opts.use_gid ? |
31aba059 EB |
357 | befs_sb->mount_opts.gid : |
358 | make_kgid(&init_user_ns, fs32_to_cpu(sb, raw_inode->gid)); | |
1da177e4 | 359 | |
bfe86848 | 360 | set_nlink(inode, 1); |
1da177e4 LT |
361 | |
362 | /* | |
363 | * BEFS's time is 64 bits, but current VFS is 32 bits... | |
364 | * BEFS don't have access time. Nor inode change time. VFS | |
365 | * doesn't have creation time. | |
e60f749b | 366 | * Also, the lower 16 bits of the last_modified_time and |
1da177e4 LT |
367 | * create_time are just a counter to help ensure uniqueness |
368 | * for indexing purposes. (PFD, page 54) | |
369 | */ | |
370 | ||
371 | inode->i_mtime.tv_sec = | |
372 | fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16; | |
e60f749b | 373 | inode->i_mtime.tv_nsec = 0; /* lower 16 bits are not a time */ |
1da177e4 LT |
374 | inode->i_ctime = inode->i_mtime; |
375 | inode->i_atime = inode->i_mtime; | |
1da177e4 LT |
376 | |
377 | befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num); | |
378 | befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent); | |
379 | befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes); | |
380 | befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags); | |
381 | ||
382 | if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){ | |
383 | inode->i_size = 0; | |
384 | inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE; | |
39d7a29f FF |
385 | strlcpy(befs_ino->i_data.symlink, raw_inode->data.symlink, |
386 | BEFS_SYMLINK_LEN); | |
1da177e4 LT |
387 | } else { |
388 | int num_blks; | |
389 | ||
390 | befs_ino->i_data.ds = | |
e0e3d32b | 391 | fsds_to_cpu(sb, &raw_inode->data.datastream); |
1da177e4 LT |
392 | |
393 | num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds); | |
394 | inode->i_blocks = | |
395 | num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE); | |
396 | inode->i_size = befs_ino->i_data.ds.size; | |
397 | } | |
398 | ||
399 | inode->i_mapping->a_ops = &befs_aops; | |
400 | ||
401 | if (S_ISREG(inode->i_mode)) { | |
2cf06916 | 402 | inode->i_fop = &generic_ro_fops; |
1da177e4 LT |
403 | } else if (S_ISDIR(inode->i_mode)) { |
404 | inode->i_op = &befs_dir_inode_operations; | |
405 | inode->i_fop = &befs_dir_operations; | |
406 | } else if (S_ISLNK(inode->i_mode)) { | |
d0deec19 | 407 | if (befs_ino->i_flags & BEFS_LONG_SYMLINK) { |
11803f97 | 408 | inode->i_op = &page_symlink_inode_operations; |
21fc61c7 | 409 | inode_nohighmem(inode); |
11803f97 | 410 | inode->i_mapping->a_ops = &befs_symlink_aops; |
d0deec19 AV |
411 | } else { |
412 | inode->i_link = befs_ino->i_data.symlink; | |
413 | inode->i_op = &simple_symlink_inode_operations; | |
414 | } | |
1da177e4 LT |
415 | } else { |
416 | befs_error(sb, "Inode %lu is not a regular file, " | |
417 | "directory or symlink. THAT IS WRONG! BeFS has no " | |
418 | "on disk special files", inode->i_ino); | |
0418726b | 419 | goto unacquire_bh; |
1da177e4 LT |
420 | } |
421 | ||
422 | brelse(bh); | |
dac52fc1 | 423 | befs_debug(sb, "<--- %s", __func__); |
96eb5419 DH |
424 | unlock_new_inode(inode); |
425 | return inode; | |
1da177e4 | 426 | |
62b80719 | 427 | unacquire_bh: |
1da177e4 LT |
428 | brelse(bh); |
429 | ||
62b80719 | 430 | unacquire_none: |
96eb5419 | 431 | iget_failed(inode); |
dac52fc1 | 432 | befs_debug(sb, "<--- %s - Bad inode", __func__); |
33c712b4 | 433 | return ERR_PTR(-EIO); |
1da177e4 LT |
434 | } |
435 | ||
436 | /* Initialize the inode cache. Called at fs setup. | |
20c2df83 | 437 | * |
1da177e4 LT |
438 | * Taken from NFS implementation by Al Viro. |
439 | */ | |
91a52ab7 | 440 | static int __init |
1da177e4 LT |
441 | befs_init_inodecache(void) |
442 | { | |
443 | befs_inode_cachep = kmem_cache_create("befs_inode_cache", | |
444 | sizeof (struct befs_inode_info), | |
fffb60f9 | 445 | 0, (SLAB_RECLAIM_ACCOUNT| |
5d097056 | 446 | SLAB_MEM_SPREAD|SLAB_ACCOUNT), |
20c2df83 | 447 | init_once); |
c08f1cb6 | 448 | if (befs_inode_cachep == NULL) |
1da177e4 | 449 | return -ENOMEM; |
c08f1cb6 | 450 | |
1da177e4 LT |
451 | return 0; |
452 | } | |
453 | ||
454 | /* Called at fs teardown. | |
e60f749b | 455 | * |
1da177e4 LT |
456 | * Taken from NFS implementation by Al Viro. |
457 | */ | |
458 | static void | |
459 | befs_destroy_inodecache(void) | |
460 | { | |
8c0a8537 KS |
461 | /* |
462 | * Make sure all delayed rcu free inodes are flushed before we | |
463 | * destroy cache. | |
464 | */ | |
465 | rcu_barrier(); | |
1a1d92c1 | 466 | kmem_cache_destroy(befs_inode_cachep); |
1da177e4 LT |
467 | } |
468 | ||
469 | /* | |
470 | * The inode of symbolic link is different to data stream. | |
471 | * The data stream become link name. Unless the LONG_SYMLINK | |
472 | * flag is set. | |
473 | */ | |
11803f97 | 474 | static int befs_symlink_readpage(struct file *unused, struct page *page) |
1da177e4 | 475 | { |
11803f97 AV |
476 | struct inode *inode = page->mapping->host; |
477 | struct super_block *sb = inode->i_sb; | |
478 | struct befs_inode_info *befs_ino = BEFS_I(inode); | |
48bc06e7 AV |
479 | befs_data_stream *data = &befs_ino->i_data.ds; |
480 | befs_off_t len = data->size; | |
21fc61c7 | 481 | char *link = page_address(page); |
1da177e4 | 482 | |
11803f97 | 483 | if (len == 0 || len > PAGE_SIZE) { |
48bc06e7 | 484 | befs_error(sb, "Long symlink with illegal length"); |
11803f97 | 485 | goto fail; |
1da177e4 | 486 | } |
680baacb AV |
487 | befs_debug(sb, "Follow long symlink"); |
488 | ||
680baacb | 489 | if (befs_read_lsymlink(sb, data, link, len) != len) { |
680baacb | 490 | befs_error(sb, "Failed to read entire long symlink"); |
11803f97 | 491 | goto fail; |
680baacb AV |
492 | } |
493 | link[len - 1] = '\0'; | |
11803f97 | 494 | SetPageUptodate(page); |
11803f97 AV |
495 | unlock_page(page); |
496 | return 0; | |
497 | fail: | |
498 | SetPageError(page); | |
11803f97 AV |
499 | unlock_page(page); |
500 | return -EIO; | |
1da177e4 LT |
501 | } |
502 | ||
1da177e4 | 503 | /* |
1ca7087e | 504 | * UTF-8 to NLS charset convert routine |
e60f749b | 505 | * |
1ca7087e | 506 | * Uses uni2char() / char2uni() rather than the nls tables directly |
1da177e4 | 507 | */ |
1da177e4 LT |
508 | static int |
509 | befs_utf2nls(struct super_block *sb, const char *in, | |
510 | int in_len, char **out, int *out_len) | |
511 | { | |
512 | struct nls_table *nls = BEFS_SB(sb)->nls; | |
513 | int i, o; | |
74675a58 | 514 | unicode_t uni; |
1da177e4 LT |
515 | int unilen, utflen; |
516 | char *result; | |
94f563c4 DC |
517 | /* The utf8->nls conversion won't make the final nls string bigger |
518 | * than the utf one, but if the string is pure ascii they'll have the | |
519 | * same width and an extra char is needed to save the additional \0 | |
520 | */ | |
521 | int maxlen = in_len + 1; | |
1da177e4 | 522 | |
dac52fc1 | 523 | befs_debug(sb, "---> %s", __func__); |
1da177e4 LT |
524 | |
525 | if (!nls) { | |
dac52fc1 | 526 | befs_error(sb, "%s called with no NLS table loaded", __func__); |
1da177e4 LT |
527 | return -EINVAL; |
528 | } | |
529 | ||
530 | *out = result = kmalloc(maxlen, GFP_NOFS); | |
62b80719 | 531 | if (!*out) |
1da177e4 | 532 | return -ENOMEM; |
1da177e4 LT |
533 | |
534 | for (i = o = 0; i < in_len; i += utflen, o += unilen) { | |
535 | ||
536 | /* convert from UTF-8 to Unicode */ | |
74675a58 AS |
537 | utflen = utf8_to_utf32(&in[i], in_len - i, &uni); |
538 | if (utflen < 0) | |
1da177e4 | 539 | goto conv_err; |
1da177e4 LT |
540 | |
541 | /* convert from Unicode to nls */ | |
74675a58 AS |
542 | if (uni > MAX_WCHAR_T) |
543 | goto conv_err; | |
1da177e4 | 544 | unilen = nls->uni2char(uni, &result[o], in_len - o); |
74675a58 | 545 | if (unilen < 0) |
1da177e4 | 546 | goto conv_err; |
1da177e4 LT |
547 | } |
548 | result[o] = '\0'; | |
549 | *out_len = o; | |
550 | ||
dac52fc1 | 551 | befs_debug(sb, "<--- %s", __func__); |
1da177e4 LT |
552 | |
553 | return o; | |
554 | ||
62b80719 | 555 | conv_err: |
1da177e4 LT |
556 | befs_error(sb, "Name using character set %s contains a character that " |
557 | "cannot be converted to unicode.", nls->charset); | |
dac52fc1 | 558 | befs_debug(sb, "<--- %s", __func__); |
1da177e4 LT |
559 | kfree(result); |
560 | return -EILSEQ; | |
561 | } | |
562 | ||
563 | /** | |
564 | * befs_nls2utf - Convert NLS string to utf8 encodeing | |
565 | * @sb: Superblock | |
817e1d90 FF |
566 | * @in: Input string buffer in NLS format |
567 | * @in_len: Length of input string in bytes | |
568 | * @out: The output string in UTF-8 format | |
569 | * @out_len: Length of the output buffer | |
e60f749b | 570 | * |
817e1d90 | 571 | * Converts input string @in, which is in the format of the loaded NLS map, |
1da177e4 | 572 | * into a utf8 string. |
e60f749b | 573 | * |
817e1d90 | 574 | * The destination string @out is allocated by this function and the caller is |
1da177e4 | 575 | * responsible for freeing it with kfree() |
e60f749b | 576 | * |
817e1d90 | 577 | * On return, *@out_len is the length of @out in bytes. |
1da177e4 LT |
578 | * |
579 | * On success, the return value is the number of utf8 characters written to | |
817e1d90 | 580 | * the output buffer @out. |
e60f749b | 581 | * |
1da177e4 LT |
582 | * On Failure, a negative number coresponding to the error code is returned. |
583 | */ | |
584 | ||
585 | static int | |
586 | befs_nls2utf(struct super_block *sb, const char *in, | |
587 | int in_len, char **out, int *out_len) | |
588 | { | |
589 | struct nls_table *nls = BEFS_SB(sb)->nls; | |
590 | int i, o; | |
591 | wchar_t uni; | |
592 | int unilen, utflen; | |
593 | char *result; | |
1ca7087e LB |
594 | /* |
595 | * There are nls characters that will translate to 3-chars-wide UTF-8 | |
596 | * characters, an additional byte is needed to save the final \0 | |
62b80719 LB |
597 | * in special cases |
598 | */ | |
94f563c4 | 599 | int maxlen = (3 * in_len) + 1; |
1da177e4 | 600 | |
dac52fc1 | 601 | befs_debug(sb, "---> %s\n", __func__); |
1da177e4 LT |
602 | |
603 | if (!nls) { | |
dac52fc1 FF |
604 | befs_error(sb, "%s called with no NLS table loaded.", |
605 | __func__); | |
1da177e4 LT |
606 | return -EINVAL; |
607 | } | |
608 | ||
609 | *out = result = kmalloc(maxlen, GFP_NOFS); | |
610 | if (!*out) { | |
1da177e4 LT |
611 | *out_len = 0; |
612 | return -ENOMEM; | |
613 | } | |
614 | ||
615 | for (i = o = 0; i < in_len; i += unilen, o += utflen) { | |
616 | ||
617 | /* convert from nls to unicode */ | |
618 | unilen = nls->char2uni(&in[i], in_len - i, &uni); | |
74675a58 | 619 | if (unilen < 0) |
1da177e4 | 620 | goto conv_err; |
1da177e4 LT |
621 | |
622 | /* convert from unicode to UTF-8 */ | |
74675a58 AS |
623 | utflen = utf32_to_utf8(uni, &result[o], 3); |
624 | if (utflen <= 0) | |
1da177e4 | 625 | goto conv_err; |
1da177e4 LT |
626 | } |
627 | ||
628 | result[o] = '\0'; | |
629 | *out_len = o; | |
630 | ||
dac52fc1 | 631 | befs_debug(sb, "<--- %s", __func__); |
1da177e4 LT |
632 | |
633 | return i; | |
634 | ||
62b80719 | 635 | conv_err: |
1ca7087e | 636 | befs_error(sb, "Name using character set %s contains a character that " |
1da177e4 | 637 | "cannot be converted to unicode.", nls->charset); |
dac52fc1 | 638 | befs_debug(sb, "<--- %s", __func__); |
1da177e4 LT |
639 | kfree(result); |
640 | return -EILSEQ; | |
641 | } | |
642 | ||
ac632f5b LB |
643 | static struct inode *befs_nfs_get_inode(struct super_block *sb, uint64_t ino, |
644 | uint32_t generation) | |
645 | { | |
646 | /* No need to handle i_generation */ | |
647 | return befs_iget(sb, ino); | |
648 | } | |
649 | ||
650 | /* | |
651 | * Map a NFS file handle to a corresponding dentry | |
652 | */ | |
653 | static struct dentry *befs_fh_to_dentry(struct super_block *sb, | |
654 | struct fid *fid, int fh_len, int fh_type) | |
655 | { | |
656 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
657 | befs_nfs_get_inode); | |
658 | } | |
659 | ||
660 | /* | |
661 | * Find the parent for a file specified by NFS handle | |
662 | */ | |
663 | static struct dentry *befs_fh_to_parent(struct super_block *sb, | |
664 | struct fid *fid, int fh_len, int fh_type) | |
665 | { | |
666 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
667 | befs_nfs_get_inode); | |
668 | } | |
669 | ||
1da177e4 LT |
670 | enum { |
671 | Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err, | |
672 | }; | |
673 | ||
a447c093 | 674 | static const match_table_t befs_tokens = { |
1da177e4 LT |
675 | {Opt_uid, "uid=%d"}, |
676 | {Opt_gid, "gid=%d"}, | |
677 | {Opt_charset, "iocharset=%s"}, | |
678 | {Opt_debug, "debug"}, | |
679 | {Opt_err, NULL} | |
680 | }; | |
681 | ||
682 | static int | |
09ad0eae | 683 | parse_options(char *options, struct befs_mount_options *opts) |
1da177e4 LT |
684 | { |
685 | char *p; | |
686 | substring_t args[MAX_OPT_ARGS]; | |
687 | int option; | |
31aba059 EB |
688 | kuid_t uid; |
689 | kgid_t gid; | |
1da177e4 LT |
690 | |
691 | /* Initialize options */ | |
31aba059 EB |
692 | opts->uid = GLOBAL_ROOT_UID; |
693 | opts->gid = GLOBAL_ROOT_GID; | |
1da177e4 LT |
694 | opts->use_uid = 0; |
695 | opts->use_gid = 0; | |
696 | opts->iocharset = NULL; | |
697 | opts->debug = 0; | |
698 | ||
699 | if (!options) | |
700 | return 1; | |
701 | ||
702 | while ((p = strsep(&options, ",")) != NULL) { | |
703 | int token; | |
62b80719 | 704 | |
1da177e4 LT |
705 | if (!*p) |
706 | continue; | |
707 | ||
708 | token = match_token(p, befs_tokens, args); | |
709 | switch (token) { | |
710 | case Opt_uid: | |
711 | if (match_int(&args[0], &option)) | |
712 | return 0; | |
31aba059 EB |
713 | uid = INVALID_UID; |
714 | if (option >= 0) | |
715 | uid = make_kuid(current_user_ns(), option); | |
716 | if (!uid_valid(uid)) { | |
dac52fc1 FF |
717 | pr_err("Invalid uid %d, " |
718 | "using default\n", option); | |
1da177e4 LT |
719 | break; |
720 | } | |
31aba059 | 721 | opts->uid = uid; |
1da177e4 LT |
722 | opts->use_uid = 1; |
723 | break; | |
724 | case Opt_gid: | |
725 | if (match_int(&args[0], &option)) | |
726 | return 0; | |
31aba059 EB |
727 | gid = INVALID_GID; |
728 | if (option >= 0) | |
729 | gid = make_kgid(current_user_ns(), option); | |
730 | if (!gid_valid(gid)) { | |
dac52fc1 FF |
731 | pr_err("Invalid gid %d, " |
732 | "using default\n", option); | |
1da177e4 LT |
733 | break; |
734 | } | |
31aba059 | 735 | opts->gid = gid; |
1da177e4 LT |
736 | opts->use_gid = 1; |
737 | break; | |
738 | case Opt_charset: | |
739 | kfree(opts->iocharset); | |
740 | opts->iocharset = match_strdup(&args[0]); | |
741 | if (!opts->iocharset) { | |
dac52fc1 FF |
742 | pr_err("allocation failure for " |
743 | "iocharset string\n"); | |
1da177e4 LT |
744 | return 0; |
745 | } | |
746 | break; | |
747 | case Opt_debug: | |
748 | opts->debug = 1; | |
749 | break; | |
750 | default: | |
dac52fc1 FF |
751 | pr_err("Unrecognized mount option \"%s\" " |
752 | "or missing value\n", p); | |
1da177e4 LT |
753 | return 0; |
754 | } | |
755 | } | |
756 | return 1; | |
757 | } | |
758 | ||
759 | /* This function has the responsibiltiy of getting the | |
e60f749b | 760 | * filesystem ready for unmounting. |
25985edc | 761 | * Basically, we free everything that we allocated in |
1da177e4 LT |
762 | * befs_read_inode |
763 | */ | |
764 | static void | |
765 | befs_put_super(struct super_block *sb) | |
766 | { | |
f99d49ad JJ |
767 | kfree(BEFS_SB(sb)->mount_opts.iocharset); |
768 | BEFS_SB(sb)->mount_opts.iocharset = NULL; | |
6d729e44 | 769 | unload_nls(BEFS_SB(sb)->nls); |
f99d49ad JJ |
770 | kfree(sb->s_fs_info); |
771 | sb->s_fs_info = NULL; | |
1da177e4 LT |
772 | } |
773 | ||
774 | /* Allocate private field of the superblock, fill it. | |
775 | * | |
776 | * Finish filling the public superblock fields | |
777 | * Make the root directory | |
778 | * Load a set of NLS translations if needed. | |
779 | */ | |
780 | static int | |
781 | befs_fill_super(struct super_block *sb, void *data, int silent) | |
782 | { | |
783 | struct buffer_head *bh; | |
038428fc | 784 | struct befs_sb_info *befs_sb; |
1da177e4 LT |
785 | befs_super_block *disk_sb; |
786 | struct inode *root; | |
96eb5419 | 787 | long ret = -EINVAL; |
1da177e4 LT |
788 | const unsigned long sb_block = 0; |
789 | const off_t x86_sb_off = 512; | |
173b066f | 790 | int blocksize; |
1da177e4 | 791 | |
552c3c6c MS |
792 | save_mount_options(sb, data); |
793 | ||
2d4319ef | 794 | sb->s_fs_info = kzalloc(sizeof(*befs_sb), GFP_KERNEL); |
c625426f | 795 | if (sb->s_fs_info == NULL) |
0418726b | 796 | goto unacquire_none; |
c625426f | 797 | |
1da177e4 | 798 | befs_sb = BEFS_SB(sb); |
1da177e4 LT |
799 | |
800 | if (!parse_options((char *) data, &befs_sb->mount_opts)) { | |
dceee2e2 ST |
801 | if (!silent) |
802 | befs_error(sb, "cannot parse mount options"); | |
0418726b | 803 | goto unacquire_priv_sbp; |
1da177e4 LT |
804 | } |
805 | ||
dac52fc1 | 806 | befs_debug(sb, "---> %s", __func__); |
1da177e4 | 807 | |
1da177e4 LT |
808 | if (!(sb->s_flags & MS_RDONLY)) { |
809 | befs_warning(sb, | |
810 | "No write support. Marking filesystem read-only"); | |
811 | sb->s_flags |= MS_RDONLY; | |
812 | } | |
1da177e4 LT |
813 | |
814 | /* | |
815 | * Set dummy blocksize to read super block. | |
816 | * Will be set to real fs blocksize later. | |
817 | * | |
818 | * Linux 2.4.10 and later refuse to read blocks smaller than | |
a441b0d0 | 819 | * the logical block size for the device. But we also need to read at |
1da177e4 | 820 | * least 1k to get the second 512 bytes of the volume. |
e60f749b | 821 | */ |
173b066f LB |
822 | blocksize = sb_min_blocksize(sb, 1024); |
823 | if (!blocksize) { | |
a6499850 LB |
824 | if (!silent) |
825 | befs_error(sb, "unable to set blocksize"); | |
173b066f LB |
826 | goto unacquire_priv_sbp; |
827 | } | |
1da177e4 | 828 | |
62b80719 LB |
829 | bh = sb_bread(sb, sb_block); |
830 | if (!bh) { | |
dceee2e2 ST |
831 | if (!silent) |
832 | befs_error(sb, "unable to read superblock"); | |
0418726b | 833 | goto unacquire_priv_sbp; |
1da177e4 LT |
834 | } |
835 | ||
836 | /* account for offset of super block on x86 */ | |
837 | disk_sb = (befs_super_block *) bh->b_data; | |
152b95a1 HH |
838 | if ((disk_sb->magic1 == BEFS_SUPER_MAGIC1_LE) || |
839 | (disk_sb->magic1 == BEFS_SUPER_MAGIC1_BE)) { | |
1da177e4 LT |
840 | befs_debug(sb, "Using PPC superblock location"); |
841 | } else { | |
842 | befs_debug(sb, "Using x86 superblock location"); | |
843 | disk_sb = | |
844 | (befs_super_block *) ((void *) bh->b_data + x86_sb_off); | |
845 | } | |
846 | ||
8e19189e FF |
847 | if ((befs_load_sb(sb, disk_sb) != BEFS_OK) || |
848 | (befs_check_sb(sb) != BEFS_OK)) | |
0418726b | 849 | goto unacquire_bh; |
1da177e4 LT |
850 | |
851 | befs_dump_super_block(sb, disk_sb); | |
852 | ||
853 | brelse(bh); | |
854 | ||
62b80719 | 855 | if (befs_sb->num_blocks > ~((sector_t)0)) { |
dceee2e2 ST |
856 | if (!silent) |
857 | befs_error(sb, "blocks count: %llu is larger than the host can use", | |
858 | befs_sb->num_blocks); | |
0418726b | 859 | goto unacquire_priv_sbp; |
1da177e4 LT |
860 | } |
861 | ||
862 | /* | |
863 | * set up enough so that it can read an inode | |
864 | * Fill in kernel superblock fields from private sb | |
865 | */ | |
866 | sb->s_magic = BEFS_SUPER_MAGIC; | |
867 | /* Set real blocksize of fs */ | |
868 | sb_set_blocksize(sb, (ulong) befs_sb->block_size); | |
b87221de | 869 | sb->s_op = &befs_sops; |
ac632f5b | 870 | sb->s_export_op = &befs_export_operations; |
96eb5419 DH |
871 | root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir))); |
872 | if (IS_ERR(root)) { | |
873 | ret = PTR_ERR(root); | |
874 | goto unacquire_priv_sbp; | |
875 | } | |
48fde701 | 876 | sb->s_root = d_make_root(root); |
1da177e4 | 877 | if (!sb->s_root) { |
dceee2e2 ST |
878 | if (!silent) |
879 | befs_error(sb, "get root inode failed"); | |
0418726b | 880 | goto unacquire_priv_sbp; |
1da177e4 LT |
881 | } |
882 | ||
883 | /* load nls library */ | |
884 | if (befs_sb->mount_opts.iocharset) { | |
885 | befs_debug(sb, "Loading nls: %s", | |
886 | befs_sb->mount_opts.iocharset); | |
887 | befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset); | |
888 | if (!befs_sb->nls) { | |
889 | befs_warning(sb, "Cannot load nls %s" | |
890 | " loading default nls", | |
891 | befs_sb->mount_opts.iocharset); | |
892 | befs_sb->nls = load_nls_default(); | |
893 | } | |
894 | /* load default nls if none is specified in mount options */ | |
895 | } else { | |
896 | befs_debug(sb, "Loading default nls"); | |
897 | befs_sb->nls = load_nls_default(); | |
898 | } | |
899 | ||
900 | return 0; | |
62b80719 LB |
901 | |
902 | unacquire_bh: | |
1da177e4 LT |
903 | brelse(bh); |
904 | ||
62b80719 | 905 | unacquire_priv_sbp: |
8dd5ca53 | 906 | kfree(befs_sb->mount_opts.iocharset); |
1da177e4 | 907 | kfree(sb->s_fs_info); |
30982583 | 908 | sb->s_fs_info = NULL; |
1da177e4 | 909 | |
62b80719 | 910 | unacquire_none: |
96eb5419 | 911 | return ret; |
1da177e4 LT |
912 | } |
913 | ||
914 | static int | |
915 | befs_remount(struct super_block *sb, int *flags, char *data) | |
916 | { | |
02b9984d | 917 | sync_filesystem(sb); |
1da177e4 LT |
918 | if (!(*flags & MS_RDONLY)) |
919 | return -EINVAL; | |
920 | return 0; | |
921 | } | |
922 | ||
923 | static int | |
726c3342 | 924 | befs_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 925 | { |
726c3342 | 926 | struct super_block *sb = dentry->d_sb; |
8587246a | 927 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
1da177e4 | 928 | |
dac52fc1 | 929 | befs_debug(sb, "---> %s", __func__); |
1da177e4 LT |
930 | |
931 | buf->f_type = BEFS_SUPER_MAGIC; | |
932 | buf->f_bsize = sb->s_blocksize; | |
933 | buf->f_blocks = BEFS_SB(sb)->num_blocks; | |
934 | buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks; | |
935 | buf->f_bavail = buf->f_bfree; | |
936 | buf->f_files = 0; /* UNKNOWN */ | |
937 | buf->f_ffree = 0; /* UNKNOWN */ | |
8587246a CL |
938 | buf->f_fsid.val[0] = (u32)id; |
939 | buf->f_fsid.val[1] = (u32)(id >> 32); | |
1da177e4 LT |
940 | buf->f_namelen = BEFS_NAME_LEN; |
941 | ||
dac52fc1 | 942 | befs_debug(sb, "<--- %s", __func__); |
1da177e4 LT |
943 | |
944 | return 0; | |
945 | } | |
946 | ||
152a0836 AV |
947 | static struct dentry * |
948 | befs_mount(struct file_system_type *fs_type, int flags, const char *dev_name, | |
949 | void *data) | |
1da177e4 | 950 | { |
152a0836 | 951 | return mount_bdev(fs_type, flags, dev_name, data, befs_fill_super); |
1da177e4 LT |
952 | } |
953 | ||
954 | static struct file_system_type befs_fs_type = { | |
955 | .owner = THIS_MODULE, | |
956 | .name = "befs", | |
152a0836 | 957 | .mount = befs_mount, |
1da177e4 | 958 | .kill_sb = kill_block_super, |
e60f749b | 959 | .fs_flags = FS_REQUIRES_DEV, |
1da177e4 | 960 | }; |
7f78e035 | 961 | MODULE_ALIAS_FS("befs"); |
1da177e4 LT |
962 | |
963 | static int __init | |
964 | init_befs_fs(void) | |
965 | { | |
966 | int err; | |
967 | ||
dac52fc1 | 968 | pr_info("version: %s\n", BEFS_VERSION); |
1da177e4 LT |
969 | |
970 | err = befs_init_inodecache(); | |
971 | if (err) | |
0418726b | 972 | goto unacquire_none; |
1da177e4 LT |
973 | |
974 | err = register_filesystem(&befs_fs_type); | |
975 | if (err) | |
0418726b | 976 | goto unacquire_inodecache; |
1da177e4 LT |
977 | |
978 | return 0; | |
979 | ||
0418726b | 980 | unacquire_inodecache: |
1da177e4 LT |
981 | befs_destroy_inodecache(); |
982 | ||
0418726b | 983 | unacquire_none: |
1da177e4 LT |
984 | return err; |
985 | } | |
986 | ||
987 | static void __exit | |
988 | exit_befs_fs(void) | |
989 | { | |
990 | befs_destroy_inodecache(); | |
991 | ||
992 | unregister_filesystem(&befs_fs_type); | |
993 | } | |
994 | ||
995 | /* | |
62b80719 LB |
996 | * Macros that typecheck the init and exit functions, |
997 | * ensures that they are called at init and cleanup, | |
998 | * and eliminates warnings about unused functions. | |
999 | */ | |
1da177e4 LT |
1000 | module_init(init_befs_fs) |
1001 | module_exit(exit_befs_fs) |