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12#include "affs.h"
13#include <linux/exportfs.h>
14
15typedef int (*toupper_t)(int);
16
17
18
19static int
20affs_toupper(int ch)
21{
22 return ch >= 'a' && ch <= 'z' ? ch -= ('a' - 'A') : ch;
23}
24
25
26
27static int
28affs_intl_toupper(int ch)
29{
30 return (ch >= 'a' && ch <= 'z') || (ch >= 0xE0
31 && ch <= 0xFE && ch != 0xF7) ?
32 ch - ('a' - 'A') : ch;
33}
34
35static inline toupper_t
36affs_get_toupper(struct super_block *sb)
37{
38 return affs_test_opt(AFFS_SB(sb)->s_flags, SF_INTL) ?
39 affs_intl_toupper : affs_toupper;
40}
41
42
43
44
45static inline int
46__affs_hash_dentry(const struct dentry *dentry, struct qstr *qstr, toupper_t toupper, bool notruncate)
47{
48 const u8 *name = qstr->name;
49 unsigned long hash;
50 int retval;
51 u32 len;
52
53 retval = affs_check_name(qstr->name, qstr->len, notruncate);
54 if (retval)
55 return retval;
56
57 hash = init_name_hash(dentry);
58 len = min(qstr->len, AFFSNAMEMAX);
59 for (; len > 0; name++, len--)
60 hash = partial_name_hash(toupper(*name), hash);
61 qstr->hash = end_name_hash(hash);
62
63 return 0;
64}
65
66static int
67affs_hash_dentry(const struct dentry *dentry, struct qstr *qstr)
68{
69 return __affs_hash_dentry(dentry, qstr, affs_toupper,
70 affs_nofilenametruncate(dentry));
71
72}
73
74static int
75affs_intl_hash_dentry(const struct dentry *dentry, struct qstr *qstr)
76{
77 return __affs_hash_dentry(dentry, qstr, affs_intl_toupper,
78 affs_nofilenametruncate(dentry));
79
80}
81
82static inline int __affs_compare_dentry(unsigned int len,
83 const char *str, const struct qstr *name, toupper_t toupper,
84 bool notruncate)
85{
86 const u8 *aname = str;
87 const u8 *bname = name->name;
88
89
90
91
92
93
94 if (affs_check_name(name->name, name->len, notruncate))
95 return 1;
96
97
98
99
100
101 if (len >= AFFSNAMEMAX) {
102 if (name->len < AFFSNAMEMAX)
103 return 1;
104 len = AFFSNAMEMAX;
105 } else if (len != name->len)
106 return 1;
107
108 for (; len > 0; len--)
109 if (toupper(*aname++) != toupper(*bname++))
110 return 1;
111
112 return 0;
113}
114
115static int
116affs_compare_dentry(const struct dentry *dentry,
117 unsigned int len, const char *str, const struct qstr *name)
118{
119
120 return __affs_compare_dentry(len, str, name, affs_toupper,
121 affs_nofilenametruncate(dentry));
122}
123
124static int
125affs_intl_compare_dentry(const struct dentry *dentry,
126 unsigned int len, const char *str, const struct qstr *name)
127{
128 return __affs_compare_dentry(len, str, name, affs_intl_toupper,
129 affs_nofilenametruncate(dentry));
130
131}
132
133
134
135
136
137static inline int
138affs_match(struct dentry *dentry, const u8 *name2, toupper_t toupper)
139{
140 const u8 *name = dentry->d_name.name;
141 int len = dentry->d_name.len;
142
143 if (len >= AFFSNAMEMAX) {
144 if (*name2 < AFFSNAMEMAX)
145 return 0;
146 len = AFFSNAMEMAX;
147 } else if (len != *name2)
148 return 0;
149
150 for (name2++; len > 0; len--)
151 if (toupper(*name++) != toupper(*name2++))
152 return 0;
153 return 1;
154}
155
156int
157affs_hash_name(struct super_block *sb, const u8 *name, unsigned int len)
158{
159 toupper_t toupper = affs_get_toupper(sb);
160 u32 hash;
161
162 hash = len = min(len, AFFSNAMEMAX);
163 for (; len > 0; len--)
164 hash = (hash * 13 + toupper(*name++)) & 0x7ff;
165
166 return hash % AFFS_SB(sb)->s_hashsize;
167}
168
169static struct buffer_head *
170affs_find_entry(struct inode *dir, struct dentry *dentry)
171{
172 struct super_block *sb = dir->i_sb;
173 struct buffer_head *bh;
174 toupper_t toupper = affs_get_toupper(sb);
175 u32 key;
176
177 pr_debug("%s(\"%pd\")\n", __func__, dentry);
178
179 bh = affs_bread(sb, dir->i_ino);
180 if (!bh)
181 return ERR_PTR(-EIO);
182
183 key = be32_to_cpu(AFFS_HEAD(bh)->table[affs_hash_name(sb, dentry->d_name.name, dentry->d_name.len)]);
184
185 for (;;) {
186 affs_brelse(bh);
187 if (key == 0)
188 return NULL;
189 bh = affs_bread(sb, key);
190 if (!bh)
191 return ERR_PTR(-EIO);
192 if (affs_match(dentry, AFFS_TAIL(sb, bh)->name, toupper))
193 return bh;
194 key = be32_to_cpu(AFFS_TAIL(sb, bh)->hash_chain);
195 }
196}
197
198struct dentry *
199affs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
200{
201 struct super_block *sb = dir->i_sb;
202 struct buffer_head *bh;
203 struct inode *inode = NULL;
204 struct dentry *res;
205
206 pr_debug("%s(\"%pd\")\n", __func__, dentry);
207
208 affs_lock_dir(dir);
209 bh = affs_find_entry(dir, dentry);
210 if (IS_ERR(bh)) {
211 affs_unlock_dir(dir);
212 return ERR_CAST(bh);
213 }
214 if (bh) {
215 u32 ino = bh->b_blocknr;
216
217
218 dentry->d_fsdata = (void *)(long)ino;
219 switch (be32_to_cpu(AFFS_TAIL(sb, bh)->stype)) {
220
221
222 case ST_LINKFILE:
223 ino = be32_to_cpu(AFFS_TAIL(sb, bh)->original);
224 }
225 affs_brelse(bh);
226 inode = affs_iget(sb, ino);
227 }
228 res = d_splice_alias(inode, dentry);
229 if (!IS_ERR_OR_NULL(res))
230 res->d_fsdata = dentry->d_fsdata;
231 affs_unlock_dir(dir);
232 return res;
233}
234
235int
236affs_unlink(struct inode *dir, struct dentry *dentry)
237{
238 pr_debug("%s(dir=%lu, %lu \"%pd\")\n", __func__, dir->i_ino,
239 d_inode(dentry)->i_ino, dentry);
240
241 return affs_remove_header(dentry);
242}
243
244int
245affs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool excl)
246{
247 struct super_block *sb = dir->i_sb;
248 struct inode *inode;
249 int error;
250
251 pr_debug("%s(%lu,\"%pd\",0%ho)\n",
252 __func__, dir->i_ino, dentry, mode);
253
254 inode = affs_new_inode(dir);
255 if (!inode)
256 return -ENOSPC;
257
258 inode->i_mode = mode;
259 affs_mode_to_prot(inode);
260 mark_inode_dirty(inode);
261
262 inode->i_op = &affs_file_inode_operations;
263 inode->i_fop = &affs_file_operations;
264 inode->i_mapping->a_ops = affs_test_opt(AFFS_SB(sb)->s_flags, SF_OFS) ?
265 &affs_aops_ofs : &affs_aops;
266 error = affs_add_entry(dir, inode, dentry, ST_FILE);
267 if (error) {
268 clear_nlink(inode);
269 iput(inode);
270 return error;
271 }
272 return 0;
273}
274
275int
276affs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
277{
278 struct inode *inode;
279 int error;
280
281 pr_debug("%s(%lu,\"%pd\",0%ho)\n",
282 __func__, dir->i_ino, dentry, mode);
283
284 inode = affs_new_inode(dir);
285 if (!inode)
286 return -ENOSPC;
287
288 inode->i_mode = S_IFDIR | mode;
289 affs_mode_to_prot(inode);
290
291 inode->i_op = &affs_dir_inode_operations;
292 inode->i_fop = &affs_dir_operations;
293
294 error = affs_add_entry(dir, inode, dentry, ST_USERDIR);
295 if (error) {
296 clear_nlink(inode);
297 mark_inode_dirty(inode);
298 iput(inode);
299 return error;
300 }
301 return 0;
302}
303
304int
305affs_rmdir(struct inode *dir, struct dentry *dentry)
306{
307 pr_debug("%s(dir=%lu, %lu \"%pd\")\n", __func__, dir->i_ino,
308 d_inode(dentry)->i_ino, dentry);
309
310 return affs_remove_header(dentry);
311}
312
313int
314affs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
315{
316 struct super_block *sb = dir->i_sb;
317 struct buffer_head *bh;
318 struct inode *inode;
319 char *p;
320 int i, maxlen, error;
321 char c, lc;
322
323 pr_debug("%s(%lu,\"%pd\" -> \"%s\")\n",
324 __func__, dir->i_ino, dentry, symname);
325
326 maxlen = AFFS_SB(sb)->s_hashsize * sizeof(u32) - 1;
327 inode = affs_new_inode(dir);
328 if (!inode)
329 return -ENOSPC;
330
331 inode->i_op = &affs_symlink_inode_operations;
332 inode_nohighmem(inode);
333 inode->i_data.a_ops = &affs_symlink_aops;
334 inode->i_mode = S_IFLNK | 0777;
335 affs_mode_to_prot(inode);
336
337 error = -EIO;
338 bh = affs_bread(sb, inode->i_ino);
339 if (!bh)
340 goto err;
341 i = 0;
342 p = (char *)AFFS_HEAD(bh)->table;
343 lc = '/';
344 if (*symname == '/') {
345 struct affs_sb_info *sbi = AFFS_SB(sb);
346 while (*symname == '/')
347 symname++;
348 spin_lock(&sbi->symlink_lock);
349 while (sbi->s_volume[i])
350 *p++ = sbi->s_volume[i++];
351 spin_unlock(&sbi->symlink_lock);
352 }
353 while (i < maxlen && (c = *symname++)) {
354 if (c == '.' && lc == '/' && *symname == '.' && symname[1] == '/') {
355 *p++ = '/';
356 i++;
357 symname += 2;
358 lc = '/';
359 } else if (c == '.' && lc == '/' && *symname == '/') {
360 symname++;
361 lc = '/';
362 } else {
363 *p++ = c;
364 lc = c;
365 i++;
366 }
367 if (lc == '/')
368 while (*symname == '/')
369 symname++;
370 }
371 *p = 0;
372 inode->i_size = i + 1;
373 mark_buffer_dirty_inode(bh, inode);
374 affs_brelse(bh);
375 mark_inode_dirty(inode);
376
377 error = affs_add_entry(dir, inode, dentry, ST_SOFTLINK);
378 if (error)
379 goto err;
380
381 return 0;
382
383err:
384 clear_nlink(inode);
385 mark_inode_dirty(inode);
386 iput(inode);
387 return error;
388}
389
390int
391affs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)
392{
393 struct inode *inode = d_inode(old_dentry);
394
395 pr_debug("%s(%lu, %lu, \"%pd\")\n", __func__, inode->i_ino, dir->i_ino,
396 dentry);
397
398 return affs_add_entry(dir, inode, dentry, ST_LINKFILE);
399}
400
401static int
402affs_rename(struct inode *old_dir, struct dentry *old_dentry,
403 struct inode *new_dir, struct dentry *new_dentry)
404{
405 struct super_block *sb = old_dir->i_sb;
406 struct buffer_head *bh = NULL;
407 int retval;
408
409 retval = affs_check_name(new_dentry->d_name.name,
410 new_dentry->d_name.len,
411 affs_nofilenametruncate(old_dentry));
412
413 if (retval)
414 return retval;
415
416
417 if (d_really_is_positive(new_dentry)) {
418 retval = affs_remove_header(new_dentry);
419 if (retval)
420 return retval;
421 }
422
423 bh = affs_bread(sb, d_inode(old_dentry)->i_ino);
424 if (!bh)
425 return -EIO;
426
427
428 affs_lock_dir(old_dir);
429 retval = affs_remove_hash(old_dir, bh);
430 affs_unlock_dir(old_dir);
431 if (retval)
432 goto done;
433
434
435 affs_copy_name(AFFS_TAIL(sb, bh)->name, new_dentry);
436 affs_fix_checksum(sb, bh);
437 affs_lock_dir(new_dir);
438 retval = affs_insert_hash(new_dir, bh);
439 affs_unlock_dir(new_dir);
440
441
442done:
443 mark_buffer_dirty_inode(bh, retval ? old_dir : new_dir);
444 affs_brelse(bh);
445 return retval;
446}
447
448static int
449affs_xrename(struct inode *old_dir, struct dentry *old_dentry,
450 struct inode *new_dir, struct dentry *new_dentry)
451{
452
453 struct super_block *sb = old_dir->i_sb;
454 struct buffer_head *bh_old = NULL;
455 struct buffer_head *bh_new = NULL;
456 int retval;
457
458 bh_old = affs_bread(sb, d_inode(old_dentry)->i_ino);
459 if (!bh_old)
460 return -EIO;
461
462 bh_new = affs_bread(sb, d_inode(new_dentry)->i_ino);
463 if (!bh_new)
464 return -EIO;
465
466
467 affs_lock_dir(old_dir);
468 retval = affs_remove_hash(old_dir, bh_old);
469 affs_unlock_dir(old_dir);
470 if (retval)
471 goto done;
472
473
474 affs_lock_dir(new_dir);
475 retval = affs_remove_hash(new_dir, bh_new);
476 affs_unlock_dir(new_dir);
477 if (retval)
478 goto done;
479
480
481 affs_copy_name(AFFS_TAIL(sb, bh_old)->name, new_dentry);
482 affs_fix_checksum(sb, bh_old);
483 affs_lock_dir(new_dir);
484 retval = affs_insert_hash(new_dir, bh_old);
485 affs_unlock_dir(new_dir);
486
487
488 affs_copy_name(AFFS_TAIL(sb, bh_new)->name, old_dentry);
489 affs_fix_checksum(sb, bh_new);
490 affs_lock_dir(old_dir);
491 retval = affs_insert_hash(old_dir, bh_new);
492 affs_unlock_dir(old_dir);
493done:
494 mark_buffer_dirty_inode(bh_old, new_dir);
495 mark_buffer_dirty_inode(bh_new, old_dir);
496 affs_brelse(bh_old);
497 affs_brelse(bh_new);
498 return retval;
499}
500
501int affs_rename2(struct inode *old_dir, struct dentry *old_dentry,
502 struct inode *new_dir, struct dentry *new_dentry,
503 unsigned int flags)
504{
505
506 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE))
507 return -EINVAL;
508
509 pr_debug("%s(old=%lu,\"%pd\" to new=%lu,\"%pd\")\n", __func__,
510 old_dir->i_ino, old_dentry, new_dir->i_ino, new_dentry);
511
512 if (flags & RENAME_EXCHANGE)
513 return affs_xrename(old_dir, old_dentry, new_dir, new_dentry);
514
515 return affs_rename(old_dir, old_dentry, new_dir, new_dentry);
516}
517
518static struct dentry *affs_get_parent(struct dentry *child)
519{
520 struct inode *parent;
521 struct buffer_head *bh;
522
523 bh = affs_bread(child->d_sb, d_inode(child)->i_ino);
524 if (!bh)
525 return ERR_PTR(-EIO);
526
527 parent = affs_iget(child->d_sb,
528 be32_to_cpu(AFFS_TAIL(child->d_sb, bh)->parent));
529 brelse(bh);
530 if (IS_ERR(parent))
531 return ERR_CAST(parent);
532
533 return d_obtain_alias(parent);
534}
535
536static struct inode *affs_nfs_get_inode(struct super_block *sb, u64 ino,
537 u32 generation)
538{
539 struct inode *inode;
540
541 if (!affs_validblock(sb, ino))
542 return ERR_PTR(-ESTALE);
543
544 inode = affs_iget(sb, ino);
545 if (IS_ERR(inode))
546 return ERR_CAST(inode);
547
548 return inode;
549}
550
551static struct dentry *affs_fh_to_dentry(struct super_block *sb, struct fid *fid,
552 int fh_len, int fh_type)
553{
554 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
555 affs_nfs_get_inode);
556}
557
558static struct dentry *affs_fh_to_parent(struct super_block *sb, struct fid *fid,
559 int fh_len, int fh_type)
560{
561 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
562 affs_nfs_get_inode);
563}
564
565const struct export_operations affs_export_ops = {
566 .fh_to_dentry = affs_fh_to_dentry,
567 .fh_to_parent = affs_fh_to_parent,
568 .get_parent = affs_get_parent,
569};
570
571const struct dentry_operations affs_dentry_operations = {
572 .d_hash = affs_hash_dentry,
573 .d_compare = affs_compare_dentry,
574};
575
576const struct dentry_operations affs_intl_dentry_operations = {
577 .d_hash = affs_intl_hash_dentry,
578 .d_compare = affs_intl_compare_dentry,
579};
580
