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5f2aa075 NJ |
1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* | |
3 | * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. | |
4 | */ | |
5 | ||
6 | #include <linux/iversion.h> | |
7 | #include <linux/namei.h> | |
8 | #include <linux/slab.h> | |
9 | #include <linux/buffer_head.h> | |
10 | #include <linux/nls.h> | |
11 | ||
12 | #include "exfat_raw.h" | |
13 | #include "exfat_fs.h" | |
14 | ||
15 | static inline unsigned long exfat_d_version(struct dentry *dentry) | |
16 | { | |
17 | return (unsigned long) dentry->d_fsdata; | |
18 | } | |
19 | ||
20 | static inline void exfat_d_version_set(struct dentry *dentry, | |
21 | unsigned long version) | |
22 | { | |
23 | dentry->d_fsdata = (void *) version; | |
24 | } | |
25 | ||
26 | /* | |
27 | * If new entry was created in the parent, it could create the 8.3 alias (the | |
28 | * shortname of logname). So, the parent may have the negative-dentry which | |
29 | * matches the created 8.3 alias. | |
30 | * | |
31 | * If it happened, the negative dentry isn't actually negative anymore. So, | |
32 | * drop it. | |
33 | */ | |
34 | static int exfat_d_revalidate(struct dentry *dentry, unsigned int flags) | |
35 | { | |
36 | int ret; | |
37 | ||
38 | if (flags & LOOKUP_RCU) | |
39 | return -ECHILD; | |
40 | ||
41 | /* | |
42 | * This is not negative dentry. Always valid. | |
43 | * | |
44 | * Note, rename() to existing directory entry will have ->d_inode, and | |
45 | * will use existing name which isn't specified name by user. | |
46 | * | |
47 | * We may be able to drop this positive dentry here. But dropping | |
48 | * positive dentry isn't good idea. So it's unsupported like | |
49 | * rename("filename", "FILENAME") for now. | |
50 | */ | |
51 | if (d_really_is_positive(dentry)) | |
52 | return 1; | |
53 | ||
54 | /* | |
55 | * Drop the negative dentry, in order to make sure to use the case | |
56 | * sensitive name which is specified by user if this is for creation. | |
57 | */ | |
58 | if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET)) | |
59 | return 0; | |
60 | ||
61 | spin_lock(&dentry->d_lock); | |
62 | ret = inode_eq_iversion(d_inode(dentry->d_parent), | |
63 | exfat_d_version(dentry)); | |
64 | spin_unlock(&dentry->d_lock); | |
65 | return ret; | |
66 | } | |
67 | ||
68 | /* returns the length of a struct qstr, ignoring trailing dots */ | |
69 | static unsigned int exfat_striptail_len(unsigned int len, const char *name) | |
70 | { | |
71 | while (len && name[len - 1] == '.') | |
72 | len--; | |
73 | return len; | |
74 | } | |
75 | ||
76 | /* | |
77 | * Compute the hash for the exfat name corresponding to the dentry. If the name | |
78 | * is invalid, we leave the hash code unchanged so that the existing dentry can | |
79 | * be used. The exfat fs routines will return ENOENT or EINVAL as appropriate. | |
80 | */ | |
81 | static int exfat_d_hash(const struct dentry *dentry, struct qstr *qstr) | |
82 | { | |
83 | struct super_block *sb = dentry->d_sb; | |
84 | struct nls_table *t = EXFAT_SB(sb)->nls_io; | |
85 | const unsigned char *name = qstr->name; | |
86 | unsigned int len = exfat_striptail_len(qstr->len, qstr->name); | |
87 | unsigned long hash = init_name_hash(dentry); | |
88 | int i, charlen; | |
89 | wchar_t c; | |
90 | ||
91 | for (i = 0; i < len; i += charlen) { | |
92 | charlen = t->char2uni(&name[i], len - i, &c); | |
93 | if (charlen < 0) | |
94 | return charlen; | |
95 | hash = partial_name_hash(exfat_toupper(sb, c), hash); | |
96 | } | |
97 | ||
98 | qstr->hash = end_name_hash(hash); | |
99 | return 0; | |
100 | } | |
101 | ||
102 | static int exfat_d_cmp(const struct dentry *dentry, unsigned int len, | |
103 | const char *str, const struct qstr *name) | |
104 | { | |
105 | struct super_block *sb = dentry->d_sb; | |
106 | struct nls_table *t = EXFAT_SB(sb)->nls_io; | |
107 | unsigned int alen = exfat_striptail_len(name->len, name->name); | |
108 | unsigned int blen = exfat_striptail_len(len, str); | |
109 | wchar_t c1, c2; | |
110 | int charlen, i; | |
111 | ||
112 | if (alen != blen) | |
113 | return 1; | |
114 | ||
115 | for (i = 0; i < len; i += charlen) { | |
116 | charlen = t->char2uni(&name->name[i], alen - i, &c1); | |
117 | if (charlen < 0) | |
118 | return 1; | |
119 | if (charlen != t->char2uni(&str[i], blen - i, &c2)) | |
120 | return 1; | |
121 | ||
122 | if (exfat_toupper(sb, c1) != exfat_toupper(sb, c2)) | |
123 | return 1; | |
124 | } | |
125 | ||
126 | return 0; | |
127 | } | |
128 | ||
129 | const struct dentry_operations exfat_dentry_ops = { | |
130 | .d_revalidate = exfat_d_revalidate, | |
131 | .d_hash = exfat_d_hash, | |
132 | .d_compare = exfat_d_cmp, | |
133 | }; | |
134 | ||
135 | static int exfat_utf8_d_hash(const struct dentry *dentry, struct qstr *qstr) | |
136 | { | |
137 | struct super_block *sb = dentry->d_sb; | |
138 | const unsigned char *name = qstr->name; | |
139 | unsigned int len = exfat_striptail_len(qstr->len, qstr->name); | |
140 | unsigned long hash = init_name_hash(dentry); | |
141 | int i, charlen; | |
142 | unicode_t u; | |
143 | ||
144 | for (i = 0; i < len; i += charlen) { | |
145 | charlen = utf8_to_utf32(&name[i], len - i, &u); | |
146 | if (charlen < 0) | |
147 | return charlen; | |
148 | ||
149 | /* | |
5f2aa075 NJ |
150 | * exfat_toupper() works only for code points up to the U+FFFF. |
151 | */ | |
dddf7da3 PR |
152 | hash = partial_name_hash(u <= 0xFFFF ? exfat_toupper(sb, u) : u, |
153 | hash); | |
5f2aa075 NJ |
154 | } |
155 | ||
156 | qstr->hash = end_name_hash(hash); | |
157 | return 0; | |
158 | } | |
159 | ||
160 | static int exfat_utf8_d_cmp(const struct dentry *dentry, unsigned int len, | |
161 | const char *str, const struct qstr *name) | |
162 | { | |
163 | struct super_block *sb = dentry->d_sb; | |
164 | unsigned int alen = exfat_striptail_len(name->len, name->name); | |
165 | unsigned int blen = exfat_striptail_len(len, str); | |
166 | unicode_t u_a, u_b; | |
167 | int charlen, i; | |
168 | ||
169 | if (alen != blen) | |
170 | return 1; | |
171 | ||
172 | for (i = 0; i < alen; i += charlen) { | |
173 | charlen = utf8_to_utf32(&name->name[i], alen - i, &u_a); | |
174 | if (charlen < 0) | |
175 | return 1; | |
176 | if (charlen != utf8_to_utf32(&str[i], blen - i, &u_b)) | |
177 | return 1; | |
178 | ||
179 | if (u_a <= 0xFFFF && u_b <= 0xFFFF) { | |
180 | if (exfat_toupper(sb, u_a) != exfat_toupper(sb, u_b)) | |
181 | return 1; | |
5f2aa075 | 182 | } else { |
197298a6 PR |
183 | if (u_a != u_b) |
184 | return 1; | |
5f2aa075 NJ |
185 | } |
186 | } | |
187 | ||
188 | return 0; | |
189 | } | |
190 | ||
191 | const struct dentry_operations exfat_utf8_dentry_ops = { | |
192 | .d_revalidate = exfat_d_revalidate, | |
193 | .d_hash = exfat_utf8_d_hash, | |
194 | .d_compare = exfat_utf8_d_cmp, | |
195 | }; | |
196 | ||
197 | /* used only in search empty_slot() */ | |
198 | #define CNT_UNUSED_NOHIT (-1) | |
199 | #define CNT_UNUSED_HIT (-2) | |
200 | /* search EMPTY CONTINUOUS "num_entries" entries */ | |
201 | static int exfat_search_empty_slot(struct super_block *sb, | |
202 | struct exfat_hint_femp *hint_femp, struct exfat_chain *p_dir, | |
203 | int num_entries) | |
204 | { | |
205 | int i, dentry, num_empty = 0; | |
206 | int dentries_per_clu; | |
207 | unsigned int type; | |
208 | struct exfat_chain clu; | |
209 | struct exfat_dentry *ep; | |
210 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
211 | struct buffer_head *bh; | |
212 | ||
213 | dentries_per_clu = sbi->dentries_per_clu; | |
214 | ||
215 | if (hint_femp->eidx != EXFAT_HINT_NONE) { | |
216 | dentry = hint_femp->eidx; | |
217 | if (num_entries <= hint_femp->count) { | |
218 | hint_femp->eidx = EXFAT_HINT_NONE; | |
219 | return dentry; | |
220 | } | |
221 | ||
222 | exfat_chain_dup(&clu, &hint_femp->cur); | |
223 | } else { | |
224 | exfat_chain_dup(&clu, p_dir); | |
225 | dentry = 0; | |
226 | } | |
227 | ||
228 | while (clu.dir != EXFAT_EOF_CLUSTER) { | |
229 | i = dentry & (dentries_per_clu - 1); | |
230 | ||
231 | for (; i < dentries_per_clu; i++, dentry++) { | |
232 | ep = exfat_get_dentry(sb, &clu, i, &bh, NULL); | |
233 | if (!ep) | |
234 | return -EIO; | |
235 | type = exfat_get_entry_type(ep); | |
236 | brelse(bh); | |
237 | ||
238 | if (type == TYPE_UNUSED || type == TYPE_DELETED) { | |
239 | num_empty++; | |
240 | if (hint_femp->eidx == EXFAT_HINT_NONE) { | |
241 | hint_femp->eidx = dentry; | |
242 | hint_femp->count = CNT_UNUSED_NOHIT; | |
243 | exfat_chain_set(&hint_femp->cur, | |
244 | clu.dir, clu.size, clu.flags); | |
245 | } | |
246 | ||
247 | if (type == TYPE_UNUSED && | |
248 | hint_femp->count != CNT_UNUSED_HIT) | |
249 | hint_femp->count = CNT_UNUSED_HIT; | |
250 | } else { | |
251 | if (hint_femp->eidx != EXFAT_HINT_NONE && | |
252 | hint_femp->count == CNT_UNUSED_HIT) { | |
253 | /* unused empty group means | |
254 | * an empty group which includes | |
255 | * unused dentry | |
256 | */ | |
257 | exfat_fs_error(sb, | |
258 | "found bogus dentry(%d) beyond unused empty group(%d) (start_clu : %u, cur_clu : %u)", | |
259 | dentry, hint_femp->eidx, | |
260 | p_dir->dir, clu.dir); | |
261 | return -EIO; | |
262 | } | |
263 | ||
264 | num_empty = 0; | |
265 | hint_femp->eidx = EXFAT_HINT_NONE; | |
266 | } | |
267 | ||
268 | if (num_empty >= num_entries) { | |
269 | /* found and invalidate hint_femp */ | |
270 | hint_femp->eidx = EXFAT_HINT_NONE; | |
271 | return (dentry - (num_entries - 1)); | |
272 | } | |
273 | } | |
274 | ||
275 | if (clu.flags == ALLOC_NO_FAT_CHAIN) { | |
276 | if (--clu.size > 0) | |
277 | clu.dir++; | |
278 | else | |
279 | clu.dir = EXFAT_EOF_CLUSTER; | |
280 | } else { | |
281 | if (exfat_get_next_cluster(sb, &clu.dir)) | |
282 | return -EIO; | |
283 | } | |
284 | } | |
285 | ||
286 | return -ENOSPC; | |
287 | } | |
288 | ||
289 | static int exfat_check_max_dentries(struct inode *inode) | |
290 | { | |
291 | if (EXFAT_B_TO_DEN(i_size_read(inode)) >= MAX_EXFAT_DENTRIES) { | |
292 | /* | |
9e456aea | 293 | * exFAT spec allows a dir to grow up to 8388608(256MB) |
5f2aa075 NJ |
294 | * dentries |
295 | */ | |
296 | return -ENOSPC; | |
297 | } | |
298 | return 0; | |
299 | } | |
300 | ||
301 | /* find empty directory entry. | |
302 | * if there isn't any empty slot, expand cluster chain. | |
303 | */ | |
304 | static int exfat_find_empty_entry(struct inode *inode, | |
305 | struct exfat_chain *p_dir, int num_entries) | |
306 | { | |
307 | int dentry; | |
308 | unsigned int ret, last_clu; | |
309 | sector_t sector; | |
310 | loff_t size = 0; | |
311 | struct exfat_chain clu; | |
312 | struct exfat_dentry *ep = NULL; | |
313 | struct super_block *sb = inode->i_sb; | |
314 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
315 | struct exfat_inode_info *ei = EXFAT_I(inode); | |
316 | struct exfat_hint_femp hint_femp; | |
317 | ||
318 | hint_femp.eidx = EXFAT_HINT_NONE; | |
319 | ||
320 | if (ei->hint_femp.eidx != EXFAT_HINT_NONE) { | |
a7a24168 | 321 | hint_femp = ei->hint_femp; |
5f2aa075 NJ |
322 | ei->hint_femp.eidx = EXFAT_HINT_NONE; |
323 | } | |
324 | ||
325 | while ((dentry = exfat_search_empty_slot(sb, &hint_femp, p_dir, | |
326 | num_entries)) < 0) { | |
327 | if (dentry == -EIO) | |
328 | break; | |
329 | ||
330 | if (exfat_check_max_dentries(inode)) | |
331 | return -ENOSPC; | |
332 | ||
333 | /* we trust p_dir->size regardless of FAT type */ | |
334 | if (exfat_find_last_cluster(sb, p_dir, &last_clu)) | |
335 | return -EIO; | |
336 | ||
337 | /* | |
338 | * Allocate new cluster to this directory | |
339 | */ | |
340 | exfat_chain_set(&clu, last_clu + 1, 0, p_dir->flags); | |
341 | ||
342 | /* allocate a cluster */ | |
343 | ret = exfat_alloc_cluster(inode, 1, &clu); | |
344 | if (ret) | |
345 | return ret; | |
346 | ||
347 | if (exfat_zeroed_cluster(inode, clu.dir)) | |
348 | return -EIO; | |
349 | ||
350 | /* append to the FAT chain */ | |
351 | if (clu.flags != p_dir->flags) { | |
352 | /* no-fat-chain bit is disabled, | |
353 | * so fat-chain should be synced with alloc-bitmap | |
354 | */ | |
355 | exfat_chain_cont_cluster(sb, p_dir->dir, p_dir->size); | |
356 | p_dir->flags = ALLOC_FAT_CHAIN; | |
357 | hint_femp.cur.flags = ALLOC_FAT_CHAIN; | |
358 | } | |
359 | ||
360 | if (clu.flags == ALLOC_FAT_CHAIN) | |
361 | if (exfat_ent_set(sb, last_clu, clu.dir)) | |
362 | return -EIO; | |
363 | ||
364 | if (hint_femp.eidx == EXFAT_HINT_NONE) { | |
365 | /* the special case that new dentry | |
366 | * should be allocated from the start of new cluster | |
367 | */ | |
368 | hint_femp.eidx = EXFAT_B_TO_DEN_IDX(p_dir->size, sbi); | |
369 | hint_femp.count = sbi->dentries_per_clu; | |
370 | ||
371 | exfat_chain_set(&hint_femp.cur, clu.dir, 0, clu.flags); | |
372 | } | |
373 | hint_femp.cur.size++; | |
374 | p_dir->size++; | |
375 | size = EXFAT_CLU_TO_B(p_dir->size, sbi); | |
376 | ||
377 | /* update the directory entry */ | |
378 | if (p_dir->dir != sbi->root_dir) { | |
379 | struct buffer_head *bh; | |
380 | ||
381 | ep = exfat_get_dentry(sb, | |
382 | &(ei->dir), ei->entry + 1, &bh, §or); | |
383 | if (!ep) | |
384 | return -EIO; | |
385 | ||
386 | ep->dentry.stream.valid_size = cpu_to_le64(size); | |
387 | ep->dentry.stream.size = ep->dentry.stream.valid_size; | |
388 | ep->dentry.stream.flags = p_dir->flags; | |
2c7f8937 | 389 | exfat_update_bh(bh, IS_DIRSYNC(inode)); |
5f2aa075 NJ |
390 | brelse(bh); |
391 | if (exfat_update_dir_chksum(inode, &(ei->dir), | |
392 | ei->entry)) | |
393 | return -EIO; | |
394 | } | |
395 | ||
396 | /* directory inode should be updated in here */ | |
397 | i_size_write(inode, size); | |
398 | EXFAT_I(inode)->i_size_ondisk += sbi->cluster_size; | |
399 | EXFAT_I(inode)->i_size_aligned += sbi->cluster_size; | |
400 | EXFAT_I(inode)->flags = p_dir->flags; | |
401 | inode->i_blocks += 1 << sbi->sect_per_clus_bits; | |
402 | } | |
403 | ||
404 | return dentry; | |
405 | } | |
406 | ||
407 | /* | |
408 | * Name Resolution Functions : | |
409 | * Zero if it was successful; otherwise nonzero. | |
410 | */ | |
411 | static int __exfat_resolve_path(struct inode *inode, const unsigned char *path, | |
412 | struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname, | |
413 | int lookup) | |
414 | { | |
415 | int namelen; | |
416 | int lossy = NLS_NAME_NO_LOSSY; | |
417 | struct super_block *sb = inode->i_sb; | |
418 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
419 | struct exfat_inode_info *ei = EXFAT_I(inode); | |
420 | ||
421 | /* strip all trailing periods */ | |
422 | namelen = exfat_striptail_len(strlen(path), path); | |
423 | if (!namelen) | |
424 | return -ENOENT; | |
425 | ||
426 | if (strlen(path) > (MAX_NAME_LENGTH * MAX_CHARSET_SIZE)) | |
427 | return -ENAMETOOLONG; | |
428 | ||
429 | /* | |
430 | * strip all leading spaces : | |
431 | * "MS windows 7" supports leading spaces. | |
432 | * So we should skip this preprocessing for compatibility. | |
433 | */ | |
434 | ||
435 | /* file name conversion : | |
436 | * If lookup case, we allow bad-name for compatibility. | |
437 | */ | |
438 | namelen = exfat_nls_to_utf16(sb, path, namelen, p_uniname, | |
439 | &lossy); | |
440 | if (namelen < 0) | |
441 | return namelen; /* return error value */ | |
442 | ||
443 | if ((lossy && !lookup) || !namelen) | |
444 | return -EINVAL; | |
445 | ||
446 | exfat_chain_set(p_dir, ei->start_clu, | |
447 | EXFAT_B_TO_CLU(i_size_read(inode), sbi), ei->flags); | |
448 | ||
449 | return 0; | |
450 | } | |
451 | ||
452 | static inline int exfat_resolve_path(struct inode *inode, | |
453 | const unsigned char *path, struct exfat_chain *dir, | |
454 | struct exfat_uni_name *uni) | |
455 | { | |
456 | return __exfat_resolve_path(inode, path, dir, uni, 0); | |
457 | } | |
458 | ||
459 | static inline int exfat_resolve_path_for_lookup(struct inode *inode, | |
460 | const unsigned char *path, struct exfat_chain *dir, | |
461 | struct exfat_uni_name *uni) | |
462 | { | |
463 | return __exfat_resolve_path(inode, path, dir, uni, 1); | |
464 | } | |
465 | ||
466 | static inline loff_t exfat_make_i_pos(struct exfat_dir_entry *info) | |
467 | { | |
468 | return ((loff_t) info->dir.dir << 32) | (info->entry & 0xffffffff); | |
469 | } | |
470 | ||
471 | static int exfat_add_entry(struct inode *inode, const char *path, | |
472 | struct exfat_chain *p_dir, unsigned int type, | |
473 | struct exfat_dir_entry *info) | |
474 | { | |
475 | int ret, dentry, num_entries; | |
476 | struct super_block *sb = inode->i_sb; | |
477 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
478 | struct exfat_uni_name uniname; | |
479 | struct exfat_chain clu; | |
480 | int clu_size = 0; | |
481 | unsigned int start_clu = EXFAT_FREE_CLUSTER; | |
482 | ||
483 | ret = exfat_resolve_path(inode, path, p_dir, &uniname); | |
484 | if (ret) | |
485 | goto out; | |
486 | ||
487 | num_entries = exfat_calc_num_entries(&uniname); | |
488 | if (num_entries < 0) { | |
489 | ret = num_entries; | |
490 | goto out; | |
491 | } | |
492 | ||
493 | /* exfat_find_empty_entry must be called before alloc_cluster() */ | |
494 | dentry = exfat_find_empty_entry(inode, p_dir, num_entries); | |
495 | if (dentry < 0) { | |
496 | ret = dentry; /* -EIO or -ENOSPC */ | |
497 | goto out; | |
498 | } | |
499 | ||
500 | if (type == TYPE_DIR) { | |
501 | ret = exfat_alloc_new_dir(inode, &clu); | |
502 | if (ret) | |
503 | goto out; | |
504 | start_clu = clu.dir; | |
505 | clu_size = sbi->cluster_size; | |
506 | } | |
507 | ||
508 | /* update the directory entry */ | |
509 | /* fill the dos name directory entry information of the created file. | |
510 | * the first cluster is not determined yet. (0) | |
511 | */ | |
512 | ret = exfat_init_dir_entry(inode, p_dir, dentry, type, | |
513 | start_clu, clu_size); | |
514 | if (ret) | |
515 | goto out; | |
516 | ||
517 | ret = exfat_init_ext_entry(inode, p_dir, dentry, num_entries, &uniname); | |
518 | if (ret) | |
519 | goto out; | |
520 | ||
a7a24168 | 521 | info->dir = *p_dir; |
5f2aa075 NJ |
522 | info->entry = dentry; |
523 | info->flags = ALLOC_NO_FAT_CHAIN; | |
524 | info->type = type; | |
525 | ||
526 | if (type == TYPE_FILE) { | |
527 | info->attr = ATTR_ARCHIVE; | |
528 | info->start_clu = EXFAT_EOF_CLUSTER; | |
529 | info->size = 0; | |
530 | info->num_subdirs = 0; | |
531 | } else { | |
5f2aa075 NJ |
532 | info->attr = ATTR_SUBDIR; |
533 | info->start_clu = start_clu; | |
534 | info->size = clu_size; | |
6c958a09 | 535 | info->num_subdirs = EXFAT_MIN_SUBDIR; |
5f2aa075 NJ |
536 | } |
537 | memset(&info->crtime, 0, sizeof(info->crtime)); | |
538 | memset(&info->mtime, 0, sizeof(info->mtime)); | |
539 | memset(&info->atime, 0, sizeof(info->atime)); | |
540 | out: | |
541 | return ret; | |
542 | } | |
543 | ||
544 | static int exfat_create(struct inode *dir, struct dentry *dentry, umode_t mode, | |
545 | bool excl) | |
546 | { | |
547 | struct super_block *sb = dir->i_sb; | |
548 | struct inode *inode; | |
549 | struct exfat_chain cdir; | |
550 | struct exfat_dir_entry info; | |
551 | loff_t i_pos; | |
552 | int err; | |
553 | ||
554 | mutex_lock(&EXFAT_SB(sb)->s_lock); | |
7018ec68 | 555 | exfat_set_volume_dirty(sb); |
5f2aa075 NJ |
556 | err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_FILE, |
557 | &info); | |
7018ec68 | 558 | exfat_clear_volume_dirty(sb); |
5f2aa075 NJ |
559 | if (err) |
560 | goto unlock; | |
561 | ||
562 | inode_inc_iversion(dir); | |
563 | dir->i_ctime = dir->i_mtime = current_time(dir); | |
564 | if (IS_DIRSYNC(dir)) | |
565 | exfat_sync_inode(dir); | |
566 | else | |
567 | mark_inode_dirty(dir); | |
568 | ||
569 | i_pos = exfat_make_i_pos(&info); | |
570 | inode = exfat_build_inode(sb, &info, i_pos); | |
d6c9efd9 TK |
571 | err = PTR_ERR_OR_ZERO(inode); |
572 | if (err) | |
5f2aa075 NJ |
573 | goto unlock; |
574 | ||
575 | inode_inc_iversion(inode); | |
576 | inode->i_mtime = inode->i_atime = inode->i_ctime = | |
577 | EXFAT_I(inode)->i_crtime = current_time(inode); | |
81df1ad4 | 578 | exfat_truncate_atime(&inode->i_atime); |
5f2aa075 NJ |
579 | /* timestamp is already written, so mark_inode_dirty() is unneeded. */ |
580 | ||
581 | d_instantiate(dentry, inode); | |
582 | unlock: | |
583 | mutex_unlock(&EXFAT_SB(sb)->s_lock); | |
584 | return err; | |
585 | } | |
586 | ||
587 | /* lookup a file */ | |
588 | static int exfat_find(struct inode *dir, struct qstr *qname, | |
589 | struct exfat_dir_entry *info) | |
590 | { | |
591 | int ret, dentry, num_entries, count; | |
592 | struct exfat_chain cdir; | |
593 | struct exfat_uni_name uni_name; | |
5f2aa075 NJ |
594 | struct super_block *sb = dir->i_sb; |
595 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
596 | struct exfat_inode_info *ei = EXFAT_I(dir); | |
188df41f TK |
597 | struct exfat_dentry *ep, *ep2; |
598 | struct exfat_entry_set_cache *es; | |
5f2aa075 NJ |
599 | |
600 | if (qname->len == 0) | |
601 | return -ENOENT; | |
602 | ||
603 | /* check the validity of directory name in the given pathname */ | |
604 | ret = exfat_resolve_path_for_lookup(dir, qname->name, &cdir, &uni_name); | |
605 | if (ret) | |
606 | return ret; | |
607 | ||
608 | num_entries = exfat_calc_num_entries(&uni_name); | |
609 | if (num_entries < 0) | |
610 | return num_entries; | |
611 | ||
612 | /* check the validation of hint_stat and initialize it if required */ | |
613 | if (ei->version != (inode_peek_iversion_raw(dir) & 0xffffffff)) { | |
614 | ei->hint_stat.clu = cdir.dir; | |
615 | ei->hint_stat.eidx = 0; | |
616 | ei->version = (inode_peek_iversion_raw(dir) & 0xffffffff); | |
617 | ei->hint_femp.eidx = EXFAT_HINT_NONE; | |
618 | } | |
619 | ||
620 | /* search the file name for directories */ | |
621 | dentry = exfat_find_dir_entry(sb, ei, &cdir, &uni_name, | |
622 | num_entries, TYPE_ALL); | |
623 | ||
188df41f | 624 | if (dentry < 0) |
5f2aa075 NJ |
625 | return dentry; /* -error value */ |
626 | ||
a7a24168 | 627 | info->dir = cdir; |
5f2aa075 NJ |
628 | info->entry = dentry; |
629 | info->num_subdirs = 0; | |
630 | ||
188df41f TK |
631 | es = exfat_get_dentry_set(sb, &cdir, dentry, ES_2_ENTRIES); |
632 | if (!es) | |
633 | return -EIO; | |
634 | ep = exfat_get_dentry_cached(es, 0); | |
635 | ep2 = exfat_get_dentry_cached(es, 1); | |
636 | ||
637 | info->type = exfat_get_entry_type(ep); | |
638 | info->attr = le16_to_cpu(ep->dentry.file.attr); | |
639 | info->size = le64_to_cpu(ep2->dentry.stream.valid_size); | |
640 | if ((info->type == TYPE_FILE) && (info->size == 0)) { | |
641 | info->flags = ALLOC_NO_FAT_CHAIN; | |
642 | info->start_clu = EXFAT_EOF_CLUSTER; | |
643 | } else { | |
644 | info->flags = ep2->dentry.stream.flags; | |
645 | info->start_clu = | |
646 | le32_to_cpu(ep2->dentry.stream.start_clu); | |
647 | } | |
5f2aa075 | 648 | |
188df41f TK |
649 | exfat_get_entry_time(sbi, &info->crtime, |
650 | ep->dentry.file.create_tz, | |
651 | ep->dentry.file.create_time, | |
652 | ep->dentry.file.create_date, | |
653 | ep->dentry.file.create_time_cs); | |
654 | exfat_get_entry_time(sbi, &info->mtime, | |
655 | ep->dentry.file.modify_tz, | |
656 | ep->dentry.file.modify_time, | |
657 | ep->dentry.file.modify_date, | |
658 | ep->dentry.file.modify_time_cs); | |
659 | exfat_get_entry_time(sbi, &info->atime, | |
660 | ep->dentry.file.access_tz, | |
661 | ep->dentry.file.access_time, | |
662 | ep->dentry.file.access_date, | |
663 | 0); | |
664 | exfat_free_dentry_set(es, false); | |
665 | ||
666 | if (ei->start_clu == EXFAT_FREE_CLUSTER) { | |
667 | exfat_fs_error(sb, | |
668 | "non-zero size file starts with zero cluster (size : %llu, p_dir : %u, entry : 0x%08x)", | |
669 | i_size_read(dir), ei->dir.dir, ei->entry); | |
670 | return -EIO; | |
671 | } | |
5f2aa075 | 672 | |
188df41f TK |
673 | if (info->type == TYPE_DIR) { |
674 | exfat_chain_set(&cdir, info->start_clu, | |
675 | EXFAT_B_TO_CLU(info->size, sbi), info->flags); | |
5f2aa075 NJ |
676 | count = exfat_count_dir_entries(sb, &cdir); |
677 | if (count < 0) | |
678 | return -EIO; | |
679 | ||
188df41f | 680 | info->num_subdirs = count + EXFAT_MIN_SUBDIR; |
5f2aa075 NJ |
681 | } |
682 | return 0; | |
683 | } | |
684 | ||
685 | static int exfat_d_anon_disconn(struct dentry *dentry) | |
686 | { | |
687 | return IS_ROOT(dentry) && (dentry->d_flags & DCACHE_DISCONNECTED); | |
688 | } | |
689 | ||
690 | static struct dentry *exfat_lookup(struct inode *dir, struct dentry *dentry, | |
691 | unsigned int flags) | |
692 | { | |
693 | struct super_block *sb = dir->i_sb; | |
694 | struct inode *inode; | |
695 | struct dentry *alias; | |
696 | struct exfat_dir_entry info; | |
697 | int err; | |
698 | loff_t i_pos; | |
699 | mode_t i_mode; | |
700 | ||
701 | mutex_lock(&EXFAT_SB(sb)->s_lock); | |
702 | err = exfat_find(dir, &dentry->d_name, &info); | |
703 | if (err) { | |
704 | if (err == -ENOENT) { | |
705 | inode = NULL; | |
706 | goto out; | |
707 | } | |
708 | goto unlock; | |
709 | } | |
710 | ||
711 | i_pos = exfat_make_i_pos(&info); | |
712 | inode = exfat_build_inode(sb, &info, i_pos); | |
d6c9efd9 TK |
713 | err = PTR_ERR_OR_ZERO(inode); |
714 | if (err) | |
5f2aa075 | 715 | goto unlock; |
5f2aa075 NJ |
716 | |
717 | i_mode = inode->i_mode; | |
718 | alias = d_find_alias(inode); | |
719 | ||
720 | /* | |
721 | * Checking "alias->d_parent == dentry->d_parent" to make sure | |
722 | * FS is not corrupted (especially double linked dir). | |
723 | */ | |
724 | if (alias && alias->d_parent == dentry->d_parent && | |
725 | !exfat_d_anon_disconn(alias)) { | |
726 | ||
727 | /* | |
728 | * Unhashed alias is able to exist because of revalidate() | |
729 | * called by lookup_fast. You can easily make this status | |
730 | * by calling create and lookup concurrently | |
731 | * In such case, we reuse an alias instead of new dentry | |
732 | */ | |
733 | if (d_unhashed(alias)) { | |
734 | WARN_ON(alias->d_name.hash_len != | |
735 | dentry->d_name.hash_len); | |
d1727d55 JP |
736 | exfat_info(sb, "rehashed a dentry(%p) in read lookup", |
737 | alias); | |
5f2aa075 NJ |
738 | d_drop(dentry); |
739 | d_rehash(alias); | |
740 | } else if (!S_ISDIR(i_mode)) { | |
741 | /* | |
742 | * This inode has non anonymous-DCACHE_DISCONNECTED | |
743 | * dentry. This means, the user did ->lookup() by an | |
744 | * another name (longname vs 8.3 alias of it) in past. | |
745 | * | |
746 | * Switch to new one for reason of locality if possible. | |
747 | */ | |
748 | d_move(alias, dentry); | |
749 | } | |
750 | iput(inode); | |
751 | mutex_unlock(&EXFAT_SB(sb)->s_lock); | |
752 | return alias; | |
753 | } | |
754 | dput(alias); | |
755 | out: | |
756 | mutex_unlock(&EXFAT_SB(sb)->s_lock); | |
757 | if (!inode) | |
758 | exfat_d_version_set(dentry, inode_query_iversion(dir)); | |
759 | ||
760 | return d_splice_alias(inode, dentry); | |
761 | unlock: | |
762 | mutex_unlock(&EXFAT_SB(sb)->s_lock); | |
763 | return ERR_PTR(err); | |
764 | } | |
765 | ||
766 | /* remove an entry, BUT don't truncate */ | |
767 | static int exfat_unlink(struct inode *dir, struct dentry *dentry) | |
768 | { | |
769 | struct exfat_chain cdir; | |
770 | struct exfat_dentry *ep; | |
771 | struct super_block *sb = dir->i_sb; | |
772 | struct inode *inode = dentry->d_inode; | |
773 | struct exfat_inode_info *ei = EXFAT_I(inode); | |
774 | struct buffer_head *bh; | |
775 | sector_t sector; | |
776 | int num_entries, entry, err = 0; | |
777 | ||
778 | mutex_lock(&EXFAT_SB(sb)->s_lock); | |
779 | exfat_chain_dup(&cdir, &ei->dir); | |
780 | entry = ei->entry; | |
781 | if (ei->dir.dir == DIR_DELETED) { | |
d1727d55 | 782 | exfat_err(sb, "abnormal access to deleted dentry"); |
5f2aa075 NJ |
783 | err = -ENOENT; |
784 | goto unlock; | |
785 | } | |
786 | ||
787 | ep = exfat_get_dentry(sb, &cdir, entry, &bh, §or); | |
788 | if (!ep) { | |
789 | err = -EIO; | |
790 | goto unlock; | |
791 | } | |
792 | num_entries = exfat_count_ext_entries(sb, &cdir, entry, ep); | |
793 | if (num_entries < 0) { | |
794 | err = -EIO; | |
795 | brelse(bh); | |
796 | goto unlock; | |
797 | } | |
798 | num_entries++; | |
799 | brelse(bh); | |
800 | ||
7018ec68 | 801 | exfat_set_volume_dirty(sb); |
5f2aa075 NJ |
802 | /* update the directory entry */ |
803 | if (exfat_remove_entries(dir, &cdir, entry, 0, num_entries)) { | |
804 | err = -EIO; | |
805 | goto unlock; | |
806 | } | |
807 | ||
808 | /* This doesn't modify ei */ | |
809 | ei->dir.dir = DIR_DELETED; | |
7018ec68 | 810 | exfat_clear_volume_dirty(sb); |
5f2aa075 NJ |
811 | |
812 | inode_inc_iversion(dir); | |
813 | dir->i_mtime = dir->i_atime = current_time(dir); | |
81df1ad4 | 814 | exfat_truncate_atime(&dir->i_atime); |
5f2aa075 NJ |
815 | if (IS_DIRSYNC(dir)) |
816 | exfat_sync_inode(dir); | |
817 | else | |
818 | mark_inode_dirty(dir); | |
819 | ||
820 | clear_nlink(inode); | |
821 | inode->i_mtime = inode->i_atime = current_time(inode); | |
81df1ad4 | 822 | exfat_truncate_atime(&inode->i_atime); |
5f2aa075 NJ |
823 | exfat_unhash_inode(inode); |
824 | exfat_d_version_set(dentry, inode_query_iversion(dir)); | |
825 | unlock: | |
826 | mutex_unlock(&EXFAT_SB(sb)->s_lock); | |
827 | return err; | |
828 | } | |
829 | ||
830 | static int exfat_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) | |
831 | { | |
832 | struct super_block *sb = dir->i_sb; | |
833 | struct inode *inode; | |
834 | struct exfat_dir_entry info; | |
835 | struct exfat_chain cdir; | |
836 | loff_t i_pos; | |
837 | int err; | |
838 | ||
839 | mutex_lock(&EXFAT_SB(sb)->s_lock); | |
7018ec68 | 840 | exfat_set_volume_dirty(sb); |
5f2aa075 NJ |
841 | err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_DIR, |
842 | &info); | |
7018ec68 | 843 | exfat_clear_volume_dirty(sb); |
5f2aa075 NJ |
844 | if (err) |
845 | goto unlock; | |
846 | ||
847 | inode_inc_iversion(dir); | |
848 | dir->i_ctime = dir->i_mtime = current_time(dir); | |
849 | if (IS_DIRSYNC(dir)) | |
850 | exfat_sync_inode(dir); | |
851 | else | |
852 | mark_inode_dirty(dir); | |
853 | inc_nlink(dir); | |
854 | ||
855 | i_pos = exfat_make_i_pos(&info); | |
856 | inode = exfat_build_inode(sb, &info, i_pos); | |
d6c9efd9 TK |
857 | err = PTR_ERR_OR_ZERO(inode); |
858 | if (err) | |
5f2aa075 | 859 | goto unlock; |
5f2aa075 NJ |
860 | |
861 | inode_inc_iversion(inode); | |
862 | inode->i_mtime = inode->i_atime = inode->i_ctime = | |
863 | EXFAT_I(inode)->i_crtime = current_time(inode); | |
81df1ad4 | 864 | exfat_truncate_atime(&inode->i_atime); |
5f2aa075 NJ |
865 | /* timestamp is already written, so mark_inode_dirty() is unneeded. */ |
866 | ||
867 | d_instantiate(dentry, inode); | |
868 | ||
869 | unlock: | |
870 | mutex_unlock(&EXFAT_SB(sb)->s_lock); | |
871 | return err; | |
872 | } | |
873 | ||
874 | static int exfat_check_dir_empty(struct super_block *sb, | |
875 | struct exfat_chain *p_dir) | |
876 | { | |
877 | int i, dentries_per_clu; | |
878 | unsigned int type; | |
879 | struct exfat_chain clu; | |
880 | struct exfat_dentry *ep; | |
881 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
882 | struct buffer_head *bh; | |
883 | ||
884 | dentries_per_clu = sbi->dentries_per_clu; | |
885 | ||
886 | exfat_chain_dup(&clu, p_dir); | |
887 | ||
888 | while (clu.dir != EXFAT_EOF_CLUSTER) { | |
889 | for (i = 0; i < dentries_per_clu; i++) { | |
890 | ep = exfat_get_dentry(sb, &clu, i, &bh, NULL); | |
891 | if (!ep) | |
892 | return -EIO; | |
893 | type = exfat_get_entry_type(ep); | |
894 | brelse(bh); | |
895 | if (type == TYPE_UNUSED) | |
896 | return 0; | |
897 | ||
898 | if (type != TYPE_FILE && type != TYPE_DIR) | |
899 | continue; | |
900 | ||
901 | return -ENOTEMPTY; | |
902 | } | |
903 | ||
904 | if (clu.flags == ALLOC_NO_FAT_CHAIN) { | |
905 | if (--clu.size > 0) | |
906 | clu.dir++; | |
907 | else | |
908 | clu.dir = EXFAT_EOF_CLUSTER; | |
909 | } else { | |
910 | if (exfat_get_next_cluster(sb, &(clu.dir))) | |
911 | return -EIO; | |
912 | } | |
913 | } | |
914 | ||
915 | return 0; | |
916 | } | |
917 | ||
918 | static int exfat_rmdir(struct inode *dir, struct dentry *dentry) | |
919 | { | |
920 | struct inode *inode = dentry->d_inode; | |
921 | struct exfat_dentry *ep; | |
922 | struct exfat_chain cdir, clu_to_free; | |
923 | struct super_block *sb = inode->i_sb; | |
924 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
925 | struct exfat_inode_info *ei = EXFAT_I(inode); | |
926 | struct buffer_head *bh; | |
927 | sector_t sector; | |
928 | int num_entries, entry, err; | |
929 | ||
930 | mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock); | |
931 | ||
932 | exfat_chain_dup(&cdir, &ei->dir); | |
933 | entry = ei->entry; | |
934 | ||
935 | if (ei->dir.dir == DIR_DELETED) { | |
d1727d55 | 936 | exfat_err(sb, "abnormal access to deleted dentry"); |
5f2aa075 NJ |
937 | err = -ENOENT; |
938 | goto unlock; | |
939 | } | |
940 | ||
5f2aa075 NJ |
941 | exfat_chain_set(&clu_to_free, ei->start_clu, |
942 | EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode), sbi), ei->flags); | |
943 | ||
944 | err = exfat_check_dir_empty(sb, &clu_to_free); | |
945 | if (err) { | |
946 | if (err == -EIO) | |
d1727d55 JP |
947 | exfat_err(sb, "failed to exfat_check_dir_empty : err(%d)", |
948 | err); | |
5f2aa075 NJ |
949 | goto unlock; |
950 | } | |
951 | ||
952 | ep = exfat_get_dentry(sb, &cdir, entry, &bh, §or); | |
953 | if (!ep) { | |
954 | err = -EIO; | |
955 | goto unlock; | |
956 | } | |
957 | ||
958 | num_entries = exfat_count_ext_entries(sb, &cdir, entry, ep); | |
959 | if (num_entries < 0) { | |
960 | err = -EIO; | |
961 | brelse(bh); | |
962 | goto unlock; | |
963 | } | |
964 | num_entries++; | |
965 | brelse(bh); | |
966 | ||
7018ec68 | 967 | exfat_set_volume_dirty(sb); |
5f2aa075 NJ |
968 | err = exfat_remove_entries(dir, &cdir, entry, 0, num_entries); |
969 | if (err) { | |
d1727d55 | 970 | exfat_err(sb, "failed to exfat_remove_entries : err(%d)", err); |
5f2aa075 NJ |
971 | goto unlock; |
972 | } | |
973 | ei->dir.dir = DIR_DELETED; | |
7018ec68 | 974 | exfat_clear_volume_dirty(sb); |
5f2aa075 NJ |
975 | |
976 | inode_inc_iversion(dir); | |
977 | dir->i_mtime = dir->i_atime = current_time(dir); | |
81df1ad4 | 978 | exfat_truncate_atime(&dir->i_atime); |
5f2aa075 NJ |
979 | if (IS_DIRSYNC(dir)) |
980 | exfat_sync_inode(dir); | |
981 | else | |
982 | mark_inode_dirty(dir); | |
983 | drop_nlink(dir); | |
984 | ||
985 | clear_nlink(inode); | |
986 | inode->i_mtime = inode->i_atime = current_time(inode); | |
81df1ad4 | 987 | exfat_truncate_atime(&inode->i_atime); |
5f2aa075 NJ |
988 | exfat_unhash_inode(inode); |
989 | exfat_d_version_set(dentry, inode_query_iversion(dir)); | |
990 | unlock: | |
991 | mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock); | |
992 | return err; | |
993 | } | |
994 | ||
995 | static int exfat_rename_file(struct inode *inode, struct exfat_chain *p_dir, | |
996 | int oldentry, struct exfat_uni_name *p_uniname, | |
997 | struct exfat_inode_info *ei) | |
998 | { | |
999 | int ret, num_old_entries, num_new_entries; | |
1000 | sector_t sector_old, sector_new; | |
1001 | struct exfat_dentry *epold, *epnew; | |
1002 | struct super_block *sb = inode->i_sb; | |
1003 | struct buffer_head *new_bh, *old_bh; | |
1004 | int sync = IS_DIRSYNC(inode); | |
1005 | ||
1006 | epold = exfat_get_dentry(sb, p_dir, oldentry, &old_bh, §or_old); | |
1007 | if (!epold) | |
1008 | return -EIO; | |
1009 | ||
1010 | num_old_entries = exfat_count_ext_entries(sb, p_dir, oldentry, epold); | |
1011 | if (num_old_entries < 0) | |
1012 | return -EIO; | |
1013 | num_old_entries++; | |
1014 | ||
1015 | num_new_entries = exfat_calc_num_entries(p_uniname); | |
1016 | if (num_new_entries < 0) | |
1017 | return num_new_entries; | |
1018 | ||
1019 | if (num_old_entries < num_new_entries) { | |
1020 | int newentry; | |
1021 | ||
1022 | newentry = | |
1023 | exfat_find_empty_entry(inode, p_dir, num_new_entries); | |
1024 | if (newentry < 0) | |
1025 | return newentry; /* -EIO or -ENOSPC */ | |
1026 | ||
1027 | epnew = exfat_get_dentry(sb, p_dir, newentry, &new_bh, | |
1028 | §or_new); | |
1029 | if (!epnew) | |
1030 | return -EIO; | |
1031 | ||
a7a24168 | 1032 | *epnew = *epold; |
5f2aa075 NJ |
1033 | if (exfat_get_entry_type(epnew) == TYPE_FILE) { |
1034 | epnew->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE); | |
1035 | ei->attr |= ATTR_ARCHIVE; | |
1036 | } | |
2c7f8937 | 1037 | exfat_update_bh(new_bh, sync); |
5f2aa075 NJ |
1038 | brelse(old_bh); |
1039 | brelse(new_bh); | |
1040 | ||
1041 | epold = exfat_get_dentry(sb, p_dir, oldentry + 1, &old_bh, | |
1042 | §or_old); | |
e8dd3cda DC |
1043 | if (!epold) |
1044 | return -EIO; | |
5f2aa075 NJ |
1045 | epnew = exfat_get_dentry(sb, p_dir, newentry + 1, &new_bh, |
1046 | §or_new); | |
e8dd3cda DC |
1047 | if (!epnew) { |
1048 | brelse(old_bh); | |
5f2aa075 | 1049 | return -EIO; |
e8dd3cda | 1050 | } |
5f2aa075 | 1051 | |
a7a24168 | 1052 | *epnew = *epold; |
2c7f8937 | 1053 | exfat_update_bh(new_bh, sync); |
5f2aa075 NJ |
1054 | brelse(old_bh); |
1055 | brelse(new_bh); | |
1056 | ||
1057 | ret = exfat_init_ext_entry(inode, p_dir, newentry, | |
1058 | num_new_entries, p_uniname); | |
1059 | if (ret) | |
1060 | return ret; | |
1061 | ||
1062 | exfat_remove_entries(inode, p_dir, oldentry, 0, | |
1063 | num_old_entries); | |
1064 | ei->entry = newentry; | |
1065 | } else { | |
1066 | if (exfat_get_entry_type(epold) == TYPE_FILE) { | |
1067 | epold->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE); | |
1068 | ei->attr |= ATTR_ARCHIVE; | |
1069 | } | |
2c7f8937 | 1070 | exfat_update_bh(old_bh, sync); |
5f2aa075 NJ |
1071 | brelse(old_bh); |
1072 | ret = exfat_init_ext_entry(inode, p_dir, oldentry, | |
1073 | num_new_entries, p_uniname); | |
1074 | if (ret) | |
1075 | return ret; | |
1076 | ||
1077 | exfat_remove_entries(inode, p_dir, oldentry, num_new_entries, | |
1078 | num_old_entries); | |
1079 | } | |
1080 | return 0; | |
1081 | } | |
1082 | ||
1083 | static int exfat_move_file(struct inode *inode, struct exfat_chain *p_olddir, | |
1084 | int oldentry, struct exfat_chain *p_newdir, | |
1085 | struct exfat_uni_name *p_uniname, struct exfat_inode_info *ei) | |
1086 | { | |
1087 | int ret, newentry, num_new_entries, num_old_entries; | |
1088 | sector_t sector_mov, sector_new; | |
1089 | struct exfat_dentry *epmov, *epnew; | |
1090 | struct super_block *sb = inode->i_sb; | |
1091 | struct buffer_head *mov_bh, *new_bh; | |
1092 | ||
1093 | epmov = exfat_get_dentry(sb, p_olddir, oldentry, &mov_bh, §or_mov); | |
1094 | if (!epmov) | |
1095 | return -EIO; | |
1096 | ||
5f2aa075 NJ |
1097 | num_old_entries = exfat_count_ext_entries(sb, p_olddir, oldentry, |
1098 | epmov); | |
1099 | if (num_old_entries < 0) | |
1100 | return -EIO; | |
1101 | num_old_entries++; | |
1102 | ||
1103 | num_new_entries = exfat_calc_num_entries(p_uniname); | |
1104 | if (num_new_entries < 0) | |
1105 | return num_new_entries; | |
1106 | ||
1107 | newentry = exfat_find_empty_entry(inode, p_newdir, num_new_entries); | |
1108 | if (newentry < 0) | |
1109 | return newentry; /* -EIO or -ENOSPC */ | |
1110 | ||
1111 | epnew = exfat_get_dentry(sb, p_newdir, newentry, &new_bh, §or_new); | |
1112 | if (!epnew) | |
1113 | return -EIO; | |
1114 | ||
a7a24168 | 1115 | *epnew = *epmov; |
5f2aa075 NJ |
1116 | if (exfat_get_entry_type(epnew) == TYPE_FILE) { |
1117 | epnew->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE); | |
1118 | ei->attr |= ATTR_ARCHIVE; | |
1119 | } | |
2c7f8937 | 1120 | exfat_update_bh(new_bh, IS_DIRSYNC(inode)); |
5f2aa075 NJ |
1121 | brelse(mov_bh); |
1122 | brelse(new_bh); | |
1123 | ||
1124 | epmov = exfat_get_dentry(sb, p_olddir, oldentry + 1, &mov_bh, | |
1125 | §or_mov); | |
e8dd3cda DC |
1126 | if (!epmov) |
1127 | return -EIO; | |
5f2aa075 NJ |
1128 | epnew = exfat_get_dentry(sb, p_newdir, newentry + 1, &new_bh, |
1129 | §or_new); | |
e8dd3cda DC |
1130 | if (!epnew) { |
1131 | brelse(mov_bh); | |
5f2aa075 | 1132 | return -EIO; |
e8dd3cda | 1133 | } |
5f2aa075 | 1134 | |
a7a24168 | 1135 | *epnew = *epmov; |
2c7f8937 | 1136 | exfat_update_bh(new_bh, IS_DIRSYNC(inode)); |
5f2aa075 NJ |
1137 | brelse(mov_bh); |
1138 | brelse(new_bh); | |
1139 | ||
1140 | ret = exfat_init_ext_entry(inode, p_newdir, newentry, num_new_entries, | |
1141 | p_uniname); | |
1142 | if (ret) | |
1143 | return ret; | |
1144 | ||
1145 | exfat_remove_entries(inode, p_olddir, oldentry, 0, num_old_entries); | |
1146 | ||
1147 | exfat_chain_set(&ei->dir, p_newdir->dir, p_newdir->size, | |
1148 | p_newdir->flags); | |
1149 | ||
1150 | ei->entry = newentry; | |
1151 | return 0; | |
1152 | } | |
1153 | ||
1154 | static void exfat_update_parent_info(struct exfat_inode_info *ei, | |
1155 | struct inode *parent_inode) | |
1156 | { | |
1157 | struct exfat_sb_info *sbi = EXFAT_SB(parent_inode->i_sb); | |
1158 | struct exfat_inode_info *parent_ei = EXFAT_I(parent_inode); | |
1159 | loff_t parent_isize = i_size_read(parent_inode); | |
1160 | ||
1161 | /* | |
1162 | * the problem that struct exfat_inode_info caches wrong parent info. | |
1163 | * | |
1164 | * because of flag-mismatch of ei->dir, | |
1165 | * there is abnormal traversing cluster chain. | |
1166 | */ | |
1167 | if (unlikely(parent_ei->flags != ei->dir.flags || | |
1168 | parent_isize != EXFAT_CLU_TO_B(ei->dir.size, sbi) || | |
1169 | parent_ei->start_clu != ei->dir.dir)) { | |
1170 | exfat_chain_set(&ei->dir, parent_ei->start_clu, | |
1171 | EXFAT_B_TO_CLU_ROUND_UP(parent_isize, sbi), | |
1172 | parent_ei->flags); | |
1173 | } | |
1174 | } | |
1175 | ||
1176 | /* rename or move a old file into a new file */ | |
1177 | static int __exfat_rename(struct inode *old_parent_inode, | |
1178 | struct exfat_inode_info *ei, struct inode *new_parent_inode, | |
1179 | struct dentry *new_dentry) | |
1180 | { | |
1181 | int ret; | |
1182 | int dentry; | |
1183 | struct exfat_chain olddir, newdir; | |
1184 | struct exfat_chain *p_dir = NULL; | |
1185 | struct exfat_uni_name uni_name; | |
1186 | struct exfat_dentry *ep; | |
1187 | struct super_block *sb = old_parent_inode->i_sb; | |
1188 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
1189 | const unsigned char *new_path = new_dentry->d_name.name; | |
1190 | struct inode *new_inode = new_dentry->d_inode; | |
1191 | int num_entries; | |
1192 | struct exfat_inode_info *new_ei = NULL; | |
1193 | unsigned int new_entry_type = TYPE_UNUSED; | |
1194 | int new_entry = 0; | |
1195 | struct buffer_head *old_bh, *new_bh = NULL; | |
1196 | ||
1197 | /* check the validity of pointer parameters */ | |
1198 | if (new_path == NULL || strlen(new_path) == 0) | |
1199 | return -EINVAL; | |
1200 | ||
1201 | if (ei->dir.dir == DIR_DELETED) { | |
d1727d55 | 1202 | exfat_err(sb, "abnormal access to deleted source dentry"); |
5f2aa075 NJ |
1203 | return -ENOENT; |
1204 | } | |
1205 | ||
1206 | exfat_update_parent_info(ei, old_parent_inode); | |
1207 | ||
1208 | exfat_chain_dup(&olddir, &ei->dir); | |
1209 | dentry = ei->entry; | |
1210 | ||
1211 | ep = exfat_get_dentry(sb, &olddir, dentry, &old_bh, NULL); | |
1212 | if (!ep) { | |
1213 | ret = -EIO; | |
1214 | goto out; | |
1215 | } | |
1216 | brelse(old_bh); | |
1217 | ||
1218 | /* check whether new dir is existing directory and empty */ | |
1219 | if (new_inode) { | |
1220 | ret = -EIO; | |
1221 | new_ei = EXFAT_I(new_inode); | |
1222 | ||
1223 | if (new_ei->dir.dir == DIR_DELETED) { | |
d1727d55 | 1224 | exfat_err(sb, "abnormal access to deleted target dentry"); |
5f2aa075 NJ |
1225 | goto out; |
1226 | } | |
1227 | ||
1228 | exfat_update_parent_info(new_ei, new_parent_inode); | |
1229 | ||
1230 | p_dir = &(new_ei->dir); | |
1231 | new_entry = new_ei->entry; | |
1232 | ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh, NULL); | |
1233 | if (!ep) | |
1234 | goto out; | |
1235 | ||
1236 | new_entry_type = exfat_get_entry_type(ep); | |
1237 | brelse(new_bh); | |
1238 | ||
1239 | /* if new_inode exists, update ei */ | |
1240 | if (new_entry_type == TYPE_DIR) { | |
1241 | struct exfat_chain new_clu; | |
1242 | ||
1243 | new_clu.dir = new_ei->start_clu; | |
1244 | new_clu.size = | |
1245 | EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode), | |
1246 | sbi); | |
1247 | new_clu.flags = new_ei->flags; | |
1248 | ||
1249 | ret = exfat_check_dir_empty(sb, &new_clu); | |
1250 | if (ret) | |
1251 | goto out; | |
1252 | } | |
1253 | } | |
1254 | ||
1255 | /* check the validity of directory name in the given new pathname */ | |
1256 | ret = exfat_resolve_path(new_parent_inode, new_path, &newdir, | |
1257 | &uni_name); | |
1258 | if (ret) | |
1259 | goto out; | |
1260 | ||
7018ec68 | 1261 | exfat_set_volume_dirty(sb); |
5f2aa075 NJ |
1262 | |
1263 | if (olddir.dir == newdir.dir) | |
1264 | ret = exfat_rename_file(new_parent_inode, &olddir, dentry, | |
1265 | &uni_name, ei); | |
1266 | else | |
1267 | ret = exfat_move_file(new_parent_inode, &olddir, dentry, | |
1268 | &newdir, &uni_name, ei); | |
1269 | ||
1270 | if (!ret && new_inode) { | |
1271 | /* delete entries of new_dir */ | |
1272 | ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh, NULL); | |
1273 | if (!ep) { | |
1274 | ret = -EIO; | |
1275 | goto del_out; | |
1276 | } | |
1277 | ||
1278 | num_entries = exfat_count_ext_entries(sb, p_dir, new_entry, ep); | |
1279 | if (num_entries < 0) { | |
1280 | ret = -EIO; | |
1281 | goto del_out; | |
1282 | } | |
1283 | brelse(new_bh); | |
1284 | ||
1285 | if (exfat_remove_entries(new_inode, p_dir, new_entry, 0, | |
1286 | num_entries + 1)) { | |
1287 | ret = -EIO; | |
1288 | goto del_out; | |
1289 | } | |
1290 | ||
1291 | /* Free the clusters if new_inode is a dir(as if exfat_rmdir) */ | |
1292 | if (new_entry_type == TYPE_DIR) { | |
1293 | /* new_ei, new_clu_to_free */ | |
1294 | struct exfat_chain new_clu_to_free; | |
1295 | ||
1296 | exfat_chain_set(&new_clu_to_free, new_ei->start_clu, | |
1297 | EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode), | |
1298 | sbi), new_ei->flags); | |
1299 | ||
1300 | if (exfat_free_cluster(new_inode, &new_clu_to_free)) { | |
1301 | /* just set I/O error only */ | |
1302 | ret = -EIO; | |
1303 | } | |
1304 | ||
1305 | i_size_write(new_inode, 0); | |
1306 | new_ei->start_clu = EXFAT_EOF_CLUSTER; | |
1307 | new_ei->flags = ALLOC_NO_FAT_CHAIN; | |
1308 | } | |
1309 | del_out: | |
1310 | /* Update new_inode ei | |
1311 | * Prevent syncing removed new_inode | |
1312 | * (new_ei is already initialized above code ("if (new_inode)") | |
1313 | */ | |
1314 | new_ei->dir.dir = DIR_DELETED; | |
1315 | } | |
7018ec68 | 1316 | exfat_clear_volume_dirty(sb); |
5f2aa075 NJ |
1317 | out: |
1318 | return ret; | |
1319 | } | |
1320 | ||
1321 | static int exfat_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1322 | struct inode *new_dir, struct dentry *new_dentry, | |
1323 | unsigned int flags) | |
1324 | { | |
1325 | struct inode *old_inode, *new_inode; | |
1326 | struct super_block *sb = old_dir->i_sb; | |
1327 | loff_t i_pos; | |
1328 | int err; | |
1329 | ||
1330 | /* | |
1331 | * The VFS already checks for existence, so for local filesystems | |
1332 | * the RENAME_NOREPLACE implementation is equivalent to plain rename. | |
1333 | * Don't support any other flags | |
1334 | */ | |
1335 | if (flags & ~RENAME_NOREPLACE) | |
1336 | return -EINVAL; | |
1337 | ||
1338 | mutex_lock(&EXFAT_SB(sb)->s_lock); | |
1339 | old_inode = old_dentry->d_inode; | |
1340 | new_inode = new_dentry->d_inode; | |
1341 | ||
1342 | err = __exfat_rename(old_dir, EXFAT_I(old_inode), new_dir, new_dentry); | |
1343 | if (err) | |
1344 | goto unlock; | |
1345 | ||
1346 | inode_inc_iversion(new_dir); | |
1347 | new_dir->i_ctime = new_dir->i_mtime = new_dir->i_atime = | |
1348 | EXFAT_I(new_dir)->i_crtime = current_time(new_dir); | |
81df1ad4 | 1349 | exfat_truncate_atime(&new_dir->i_atime); |
5f2aa075 NJ |
1350 | if (IS_DIRSYNC(new_dir)) |
1351 | exfat_sync_inode(new_dir); | |
1352 | else | |
1353 | mark_inode_dirty(new_dir); | |
1354 | ||
1355 | i_pos = ((loff_t)EXFAT_I(old_inode)->dir.dir << 32) | | |
1356 | (EXFAT_I(old_inode)->entry & 0xffffffff); | |
1357 | exfat_unhash_inode(old_inode); | |
1358 | exfat_hash_inode(old_inode, i_pos); | |
1359 | if (IS_DIRSYNC(new_dir)) | |
1360 | exfat_sync_inode(old_inode); | |
1361 | else | |
1362 | mark_inode_dirty(old_inode); | |
1363 | ||
1364 | if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) { | |
1365 | drop_nlink(old_dir); | |
1366 | if (!new_inode) | |
1367 | inc_nlink(new_dir); | |
1368 | } | |
1369 | ||
1370 | inode_inc_iversion(old_dir); | |
1371 | old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir); | |
1372 | if (IS_DIRSYNC(old_dir)) | |
1373 | exfat_sync_inode(old_dir); | |
1374 | else | |
1375 | mark_inode_dirty(old_dir); | |
1376 | ||
1377 | if (new_inode) { | |
1378 | exfat_unhash_inode(new_inode); | |
1379 | ||
1380 | /* skip drop_nlink if new_inode already has been dropped */ | |
1381 | if (new_inode->i_nlink) { | |
1382 | drop_nlink(new_inode); | |
1383 | if (S_ISDIR(new_inode->i_mode)) | |
1384 | drop_nlink(new_inode); | |
1385 | } else { | |
d1727d55 | 1386 | exfat_warn(sb, "abnormal access to an inode dropped"); |
5f2aa075 NJ |
1387 | WARN_ON(new_inode->i_nlink == 0); |
1388 | } | |
1389 | new_inode->i_ctime = EXFAT_I(new_inode)->i_crtime = | |
1390 | current_time(new_inode); | |
1391 | } | |
1392 | ||
1393 | unlock: | |
1394 | mutex_unlock(&EXFAT_SB(sb)->s_lock); | |
1395 | return err; | |
1396 | } | |
1397 | ||
1398 | const struct inode_operations exfat_dir_inode_operations = { | |
1399 | .create = exfat_create, | |
1400 | .lookup = exfat_lookup, | |
1401 | .unlink = exfat_unlink, | |
1402 | .mkdir = exfat_mkdir, | |
1403 | .rmdir = exfat_rmdir, | |
1404 | .rename = exfat_rename, | |
1405 | .setattr = exfat_setattr, | |
1406 | .getattr = exfat_getattr, | |
1407 | }; |