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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/affs/namei.c
3 *
4 * (c) 1996 Hans-Joachim Widmaier - Rewritten
5 *
6 * (C) 1993 Ray Burr - Modified for Amiga FFS filesystem.
7 *
8 * (C) 1991 Linus Torvalds - minix filesystem
9 */
10
11#include "affs.h"
12
13typedef int (*toupper_t)(int);
14
15static int affs_toupper(int ch);
Linus Torvaldsda53be12013-05-21 15:22:44 -070016static int affs_hash_dentry(const struct dentry *, struct qstr *);
17static int affs_compare_dentry(const struct dentry *parent, const struct dentry *dentry,
Nick Piggin621e1552011-01-07 17:49:27 +110018 unsigned int len, const char *str, const struct qstr *name);
Linus Torvalds1da177e2005-04-16 15:20:36 -070019static int affs_intl_toupper(int ch);
Linus Torvaldsda53be12013-05-21 15:22:44 -070020static int affs_intl_hash_dentry(const struct dentry *, struct qstr *);
21static int affs_intl_compare_dentry(const struct dentry *parent, const struct dentry *dentry,
Nick Piggin621e1552011-01-07 17:49:27 +110022 unsigned int len, const char *str, const struct qstr *name);
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
Al Viroe16404e2009-02-20 05:55:13 +000024const struct dentry_operations affs_dentry_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070025 .d_hash = affs_hash_dentry,
26 .d_compare = affs_compare_dentry,
27};
28
Al Viroa1298802011-01-12 16:45:19 -050029const struct dentry_operations affs_intl_dentry_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070030 .d_hash = affs_intl_hash_dentry,
31 .d_compare = affs_intl_compare_dentry,
32};
33
34
35/* Simple toupper() for DOS\1 */
36
37static int
38affs_toupper(int ch)
39{
40 return ch >= 'a' && ch <= 'z' ? ch -= ('a' - 'A') : ch;
41}
42
43/* International toupper() for DOS\3 ("international") */
44
45static int
46affs_intl_toupper(int ch)
47{
48 return (ch >= 'a' && ch <= 'z') || (ch >= 0xE0
49 && ch <= 0xFE && ch != 0xF7) ?
50 ch - ('a' - 'A') : ch;
51}
52
53static inline toupper_t
54affs_get_toupper(struct super_block *sb)
55{
56 return AFFS_SB(sb)->s_flags & SF_INTL ? affs_intl_toupper : affs_toupper;
57}
58
59/*
60 * Note: the dentry argument is the parent dentry.
61 */
62static inline int
Fabian Frederick8ca57722014-04-07 15:39:01 -070063__affs_hash_dentry(struct qstr *qstr, toupper_t toupper, bool notruncate)
Linus Torvalds1da177e2005-04-16 15:20:36 -070064{
65 const u8 *name = qstr->name;
66 unsigned long hash;
Fabian Frederickeeb36f82015-02-17 13:46:20 -080067 int retval;
68 u32 len;
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
Fabian Frederickeeb36f82015-02-17 13:46:20 -080070 retval = affs_check_name(qstr->name, qstr->len, notruncate);
71 if (retval)
72 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
74 hash = init_name_hash();
Fabian Frederickf1578532015-02-17 13:46:23 -080075 len = min(qstr->len, AFFSNAMEMAX);
Fabian Frederickeeb36f82015-02-17 13:46:20 -080076 for (; len > 0; name++, len--)
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 hash = partial_name_hash(toupper(*name), hash);
78 qstr->hash = end_name_hash(hash);
79
80 return 0;
81}
82
83static int
Linus Torvaldsda53be12013-05-21 15:22:44 -070084affs_hash_dentry(const struct dentry *dentry, struct qstr *qstr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070085{
Fabian Frederick8ca57722014-04-07 15:39:01 -070086 return __affs_hash_dentry(qstr, affs_toupper,
87 affs_nofilenametruncate(dentry));
88
Linus Torvalds1da177e2005-04-16 15:20:36 -070089}
Fabian Frederick8ca57722014-04-07 15:39:01 -070090
Linus Torvalds1da177e2005-04-16 15:20:36 -070091static int
Linus Torvaldsda53be12013-05-21 15:22:44 -070092affs_intl_hash_dentry(const struct dentry *dentry, struct qstr *qstr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070093{
Fabian Frederick8ca57722014-04-07 15:39:01 -070094 return __affs_hash_dentry(qstr, affs_intl_toupper,
95 affs_nofilenametruncate(dentry));
96
Linus Torvalds1da177e2005-04-16 15:20:36 -070097}
98
Nick Piggin621e1552011-01-07 17:49:27 +110099static inline int __affs_compare_dentry(unsigned int len,
Fabian Frederick8ca57722014-04-07 15:39:01 -0700100 const char *str, const struct qstr *name, toupper_t toupper,
101 bool notruncate)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102{
Nick Piggin621e1552011-01-07 17:49:27 +1100103 const u8 *aname = str;
104 const u8 *bname = name->name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105
Nick Piggin621e1552011-01-07 17:49:27 +1100106 /*
107 * 'str' is the name of an already existing dentry, so the name
108 * must be valid. 'name' must be validated first.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 */
110
Fabian Frederick8ca57722014-04-07 15:39:01 -0700111 if (affs_check_name(name->name, name->len, notruncate))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 return 1;
113
Nick Piggin621e1552011-01-07 17:49:27 +1100114 /*
115 * If the names are longer than the allowed 30 chars,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 * the excess is ignored, so their length may differ.
117 */
Fabian Frederickf1578532015-02-17 13:46:23 -0800118 if (len >= AFFSNAMEMAX) {
119 if (name->len < AFFSNAMEMAX)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 return 1;
Fabian Frederickf1578532015-02-17 13:46:23 -0800121 len = AFFSNAMEMAX;
Nick Piggin621e1552011-01-07 17:49:27 +1100122 } else if (len != name->len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 return 1;
124
125 for (; len > 0; len--)
126 if (toupper(*aname++) != toupper(*bname++))
127 return 1;
128
129 return 0;
130}
131
132static int
Linus Torvaldsda53be12013-05-21 15:22:44 -0700133affs_compare_dentry(const struct dentry *parent, const struct dentry *dentry,
Nick Piggin621e1552011-01-07 17:49:27 +1100134 unsigned int len, const char *str, const struct qstr *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135{
Fabian Frederick8ca57722014-04-07 15:39:01 -0700136
137 return __affs_compare_dentry(len, str, name, affs_toupper,
138 affs_nofilenametruncate(parent));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139}
Fabian Frederick8ca57722014-04-07 15:39:01 -0700140
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141static int
Linus Torvaldsda53be12013-05-21 15:22:44 -0700142affs_intl_compare_dentry(const struct dentry *parent, const struct dentry *dentry,
Nick Piggin621e1552011-01-07 17:49:27 +1100143 unsigned int len, const char *str, const struct qstr *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144{
Fabian Frederick8ca57722014-04-07 15:39:01 -0700145 return __affs_compare_dentry(len, str, name, affs_intl_toupper,
146 affs_nofilenametruncate(parent));
147
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148}
149
150/*
151 * NOTE! unlike strncmp, affs_match returns 1 for success, 0 for failure.
152 */
153
154static inline int
155affs_match(struct dentry *dentry, const u8 *name2, toupper_t toupper)
156{
157 const u8 *name = dentry->d_name.name;
158 int len = dentry->d_name.len;
159
Fabian Frederickf1578532015-02-17 13:46:23 -0800160 if (len >= AFFSNAMEMAX) {
161 if (*name2 < AFFSNAMEMAX)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 return 0;
Fabian Frederickf1578532015-02-17 13:46:23 -0800163 len = AFFSNAMEMAX;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 } else if (len != *name2)
165 return 0;
166
167 for (name2++; len > 0; len--)
168 if (toupper(*name++) != toupper(*name2++))
169 return 0;
170 return 1;
171}
172
173int
174affs_hash_name(struct super_block *sb, const u8 *name, unsigned int len)
175{
176 toupper_t toupper = affs_get_toupper(sb);
Fabian Frederickeeb36f82015-02-17 13:46:20 -0800177 u32 hash;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178
Fabian Frederickf1578532015-02-17 13:46:23 -0800179 hash = len = min(len, AFFSNAMEMAX);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 for (; len > 0; len--)
181 hash = (hash * 13 + toupper(*name++)) & 0x7ff;
182
183 return hash % AFFS_SB(sb)->s_hashsize;
184}
185
186static struct buffer_head *
187affs_find_entry(struct inode *dir, struct dentry *dentry)
188{
189 struct super_block *sb = dir->i_sb;
190 struct buffer_head *bh;
191 toupper_t toupper = affs_get_toupper(sb);
192 u32 key;
193
Al Viroa4555892014-10-21 20:11:25 -0400194 pr_debug("%s(\"%pd\")\n", __func__, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195
196 bh = affs_bread(sb, dir->i_ino);
197 if (!bh)
198 return ERR_PTR(-EIO);
199
200 key = be32_to_cpu(AFFS_HEAD(bh)->table[affs_hash_name(sb, dentry->d_name.name, dentry->d_name.len)]);
201
202 for (;;) {
203 affs_brelse(bh);
204 if (key == 0)
205 return NULL;
206 bh = affs_bread(sb, key);
207 if (!bh)
208 return ERR_PTR(-EIO);
209 if (affs_match(dentry, AFFS_TAIL(sb, bh)->name, toupper))
210 return bh;
211 key = be32_to_cpu(AFFS_TAIL(sb, bh)->hash_chain);
212 }
213}
214
215struct dentry *
Al Viro00cd8dd2012-06-10 17:13:09 -0400216affs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217{
218 struct super_block *sb = dir->i_sb;
219 struct buffer_head *bh;
220 struct inode *inode = NULL;
221
Al Viroa4555892014-10-21 20:11:25 -0400222 pr_debug("%s(\"%pd\")\n", __func__, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223
224 affs_lock_dir(dir);
225 bh = affs_find_entry(dir, dentry);
226 affs_unlock_dir(dir);
David Howells210f8552008-02-07 00:15:29 -0800227 if (IS_ERR(bh))
David Howellse231c2e2008-02-07 00:15:26 -0800228 return ERR_CAST(bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 if (bh) {
230 u32 ino = bh->b_blocknr;
231
232 /* store the real header ino in d_fsdata for faster lookups */
233 dentry->d_fsdata = (void *)(long)ino;
234 switch (be32_to_cpu(AFFS_TAIL(sb, bh)->stype)) {
235 //link to dirs disabled
236 //case ST_LINKDIR:
237 case ST_LINKFILE:
238 ino = be32_to_cpu(AFFS_TAIL(sb, bh)->original);
239 }
240 affs_brelse(bh);
David Howells210f8552008-02-07 00:15:29 -0800241 inode = affs_iget(sb, ino);
242 if (IS_ERR(inode))
Julia Lawallcccad8f2010-05-26 14:44:23 -0700243 return ERR_CAST(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 d_add(dentry, inode);
246 return NULL;
247}
248
249int
250affs_unlink(struct inode *dir, struct dentry *dentry)
251{
Geert Uytterhoeven08fe1002015-02-17 13:46:10 -0800252 pr_debug("%s(dir=%lu, %lu \"%pd\")\n", __func__, dir->i_ino,
253 dentry->d_inode->i_ino, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254
255 return affs_remove_header(dentry);
256}
257
258int
Al Viroebfc3b42012-06-10 18:05:36 -0400259affs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool excl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260{
261 struct super_block *sb = dir->i_sb;
262 struct inode *inode;
263 int error;
264
Al Viroa4555892014-10-21 20:11:25 -0400265 pr_debug("%s(%lu,\"%pd\",0%ho)\n",
266 __func__, dir->i_ino, dentry, mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267
268 inode = affs_new_inode(dir);
269 if (!inode)
270 return -ENOSPC;
271
272 inode->i_mode = mode;
273 mode_to_prot(inode);
274 mark_inode_dirty(inode);
275
276 inode->i_op = &affs_file_inode_operations;
277 inode->i_fop = &affs_file_operations;
278 inode->i_mapping->a_ops = (AFFS_SB(sb)->s_flags & SF_OFS) ? &affs_aops_ofs : &affs_aops;
279 error = affs_add_entry(dir, inode, dentry, ST_FILE);
280 if (error) {
Miklos Szeredi6d6b77f2011-10-28 14:13:28 +0200281 clear_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 iput(inode);
283 return error;
284 }
285 return 0;
286}
287
288int
Al Viro18bb1db2011-07-26 01:41:39 -0400289affs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290{
291 struct inode *inode;
292 int error;
293
Al Viroa4555892014-10-21 20:11:25 -0400294 pr_debug("%s(%lu,\"%pd\",0%ho)\n",
295 __func__, dir->i_ino, dentry, mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296
297 inode = affs_new_inode(dir);
298 if (!inode)
299 return -ENOSPC;
300
301 inode->i_mode = S_IFDIR | mode;
302 mode_to_prot(inode);
303
304 inode->i_op = &affs_dir_inode_operations;
305 inode->i_fop = &affs_dir_operations;
306
307 error = affs_add_entry(dir, inode, dentry, ST_USERDIR);
308 if (error) {
Miklos Szeredi6d6b77f2011-10-28 14:13:28 +0200309 clear_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 mark_inode_dirty(inode);
311 iput(inode);
312 return error;
313 }
314 return 0;
315}
316
317int
318affs_rmdir(struct inode *dir, struct dentry *dentry)
319{
Geert Uytterhoeven08fe1002015-02-17 13:46:10 -0800320 pr_debug("%s(dir=%lu, %lu \"%pd\")\n", __func__, dir->i_ino,
321 dentry->d_inode->i_ino, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322
323 return affs_remove_header(dentry);
324}
325
326int
327affs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
328{
329 struct super_block *sb = dir->i_sb;
330 struct buffer_head *bh;
331 struct inode *inode;
332 char *p;
333 int i, maxlen, error;
334 char c, lc;
335
Al Viroa4555892014-10-21 20:11:25 -0400336 pr_debug("%s(%lu,\"%pd\" -> \"%s\")\n",
337 __func__, dir->i_ino, dentry, symname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338
339 maxlen = AFFS_SB(sb)->s_hashsize * sizeof(u32) - 1;
340 inode = affs_new_inode(dir);
341 if (!inode)
342 return -ENOSPC;
343
344 inode->i_op = &affs_symlink_inode_operations;
345 inode->i_data.a_ops = &affs_symlink_aops;
346 inode->i_mode = S_IFLNK | 0777;
347 mode_to_prot(inode);
348
349 error = -EIO;
350 bh = affs_bread(sb, inode->i_ino);
351 if (!bh)
352 goto err;
353 i = 0;
354 p = (char *)AFFS_HEAD(bh)->table;
355 lc = '/';
356 if (*symname == '/') {
Al Viro29333922010-01-24 00:04:07 -0500357 struct affs_sb_info *sbi = AFFS_SB(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 while (*symname == '/')
359 symname++;
Al Viro29333922010-01-24 00:04:07 -0500360 spin_lock(&sbi->symlink_lock);
361 while (sbi->s_volume[i]) /* Cannot overflow */
362 *p++ = sbi->s_volume[i++];
363 spin_unlock(&sbi->symlink_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 }
365 while (i < maxlen && (c = *symname++)) {
366 if (c == '.' && lc == '/' && *symname == '.' && symname[1] == '/') {
367 *p++ = '/';
368 i++;
369 symname += 2;
370 lc = '/';
371 } else if (c == '.' && lc == '/' && *symname == '/') {
372 symname++;
373 lc = '/';
374 } else {
375 *p++ = c;
376 lc = c;
377 i++;
378 }
379 if (lc == '/')
380 while (*symname == '/')
381 symname++;
382 }
383 *p = 0;
384 mark_buffer_dirty_inode(bh, inode);
385 affs_brelse(bh);
386 mark_inode_dirty(inode);
387
388 error = affs_add_entry(dir, inode, dentry, ST_SOFTLINK);
389 if (error)
390 goto err;
391
392 return 0;
393
394err:
Miklos Szeredi6d6b77f2011-10-28 14:13:28 +0200395 clear_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 mark_inode_dirty(inode);
397 iput(inode);
398 return error;
399}
400
401int
402affs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)
403{
404 struct inode *inode = old_dentry->d_inode;
405
Geert Uytterhoeven08fe1002015-02-17 13:46:10 -0800406 pr_debug("%s(%lu, %lu, \"%pd\")\n", __func__, inode->i_ino, dir->i_ino,
Al Viroa4555892014-10-21 20:11:25 -0400407 dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408
409 return affs_add_entry(dir, inode, dentry, ST_LINKFILE);
410}
411
412int
413affs_rename(struct inode *old_dir, struct dentry *old_dentry,
414 struct inode *new_dir, struct dentry *new_dentry)
415{
416 struct super_block *sb = old_dir->i_sb;
417 struct buffer_head *bh = NULL;
418 int retval;
419
Geert Uytterhoeven08fe1002015-02-17 13:46:10 -0800420 pr_debug("%s(old=%lu,\"%pd\" to new=%lu,\"%pd\")\n", __func__,
421 old_dir->i_ino, old_dentry, new_dir->i_ino, new_dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422
Fabian Frederick8ca57722014-04-07 15:39:01 -0700423 retval = affs_check_name(new_dentry->d_name.name,
424 new_dentry->d_name.len,
425 affs_nofilenametruncate(old_dentry));
426
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 if (retval)
428 return retval;
429
430 /* Unlink destination if it already exists */
431 if (new_dentry->d_inode) {
432 retval = affs_remove_header(new_dentry);
433 if (retval)
434 return retval;
435 }
436
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 bh = affs_bread(sb, old_dentry->d_inode->i_ino);
438 if (!bh)
Florin Malita3ac81412006-05-25 18:44:23 -0700439 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440
441 /* Remove header from its parent directory. */
442 affs_lock_dir(old_dir);
443 retval = affs_remove_hash(old_dir, bh);
444 affs_unlock_dir(old_dir);
445 if (retval)
446 goto done;
447
448 /* And insert it into the new directory with the new name. */
449 affs_copy_name(AFFS_TAIL(sb, bh)->name, new_dentry);
450 affs_fix_checksum(sb, bh);
451 affs_lock_dir(new_dir);
452 retval = affs_insert_hash(new_dir, bh);
453 affs_unlock_dir(new_dir);
454 /* TODO: move it back to old_dir, if error? */
455
456done:
457 mark_buffer_dirty_inode(bh, retval ? old_dir : new_dir);
458 affs_brelse(bh);
459 return retval;
460}