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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 | ||
9ec784bf VK |
68 | /* returns the length of a struct qstr, ignoring trailing dots if necessary */ |
69 | static unsigned int exfat_striptail_len(unsigned int len, const char *name, | |
70 | bool keep_last_dots) | |
5f2aa075 | 71 | { |
9ec784bf VK |
72 | if (!keep_last_dots) { |
73 | while (len && name[len - 1] == '.') | |
74 | len--; | |
75 | } | |
5f2aa075 NJ |
76 | return len; |
77 | } | |
78 | ||
79 | /* | |
80 | * Compute the hash for the exfat name corresponding to the dentry. If the name | |
81 | * is invalid, we leave the hash code unchanged so that the existing dentry can | |
82 | * be used. The exfat fs routines will return ENOENT or EINVAL as appropriate. | |
83 | */ | |
84 | static int exfat_d_hash(const struct dentry *dentry, struct qstr *qstr) | |
85 | { | |
86 | struct super_block *sb = dentry->d_sb; | |
87 | struct nls_table *t = EXFAT_SB(sb)->nls_io; | |
88 | const unsigned char *name = qstr->name; | |
9ec784bf VK |
89 | unsigned int len = exfat_striptail_len(qstr->len, qstr->name, |
90 | EXFAT_SB(sb)->options.keep_last_dots); | |
5f2aa075 NJ |
91 | unsigned long hash = init_name_hash(dentry); |
92 | int i, charlen; | |
93 | wchar_t c; | |
94 | ||
95 | for (i = 0; i < len; i += charlen) { | |
96 | charlen = t->char2uni(&name[i], len - i, &c); | |
97 | if (charlen < 0) | |
98 | return charlen; | |
99 | hash = partial_name_hash(exfat_toupper(sb, c), hash); | |
100 | } | |
101 | ||
102 | qstr->hash = end_name_hash(hash); | |
103 | return 0; | |
104 | } | |
105 | ||
106 | static int exfat_d_cmp(const struct dentry *dentry, unsigned int len, | |
107 | const char *str, const struct qstr *name) | |
108 | { | |
109 | struct super_block *sb = dentry->d_sb; | |
110 | struct nls_table *t = EXFAT_SB(sb)->nls_io; | |
9ec784bf VK |
111 | unsigned int alen = exfat_striptail_len(name->len, name->name, |
112 | EXFAT_SB(sb)->options.keep_last_dots); | |
113 | unsigned int blen = exfat_striptail_len(len, str, | |
114 | EXFAT_SB(sb)->options.keep_last_dots); | |
5f2aa075 NJ |
115 | wchar_t c1, c2; |
116 | int charlen, i; | |
117 | ||
118 | if (alen != blen) | |
119 | return 1; | |
120 | ||
121 | for (i = 0; i < len; i += charlen) { | |
122 | charlen = t->char2uni(&name->name[i], alen - i, &c1); | |
123 | if (charlen < 0) | |
124 | return 1; | |
125 | if (charlen != t->char2uni(&str[i], blen - i, &c2)) | |
126 | return 1; | |
127 | ||
128 | if (exfat_toupper(sb, c1) != exfat_toupper(sb, c2)) | |
129 | return 1; | |
130 | } | |
131 | ||
132 | return 0; | |
133 | } | |
134 | ||
135 | const struct dentry_operations exfat_dentry_ops = { | |
136 | .d_revalidate = exfat_d_revalidate, | |
137 | .d_hash = exfat_d_hash, | |
138 | .d_compare = exfat_d_cmp, | |
139 | }; | |
140 | ||
141 | static int exfat_utf8_d_hash(const struct dentry *dentry, struct qstr *qstr) | |
142 | { | |
143 | struct super_block *sb = dentry->d_sb; | |
144 | const unsigned char *name = qstr->name; | |
9ec784bf VK |
145 | unsigned int len = exfat_striptail_len(qstr->len, qstr->name, |
146 | EXFAT_SB(sb)->options.keep_last_dots); | |
5f2aa075 NJ |
147 | unsigned long hash = init_name_hash(dentry); |
148 | int i, charlen; | |
149 | unicode_t u; | |
150 | ||
151 | for (i = 0; i < len; i += charlen) { | |
152 | charlen = utf8_to_utf32(&name[i], len - i, &u); | |
153 | if (charlen < 0) | |
154 | return charlen; | |
155 | ||
156 | /* | |
5f2aa075 NJ |
157 | * exfat_toupper() works only for code points up to the U+FFFF. |
158 | */ | |
dddf7da3 PR |
159 | hash = partial_name_hash(u <= 0xFFFF ? exfat_toupper(sb, u) : u, |
160 | hash); | |
5f2aa075 NJ |
161 | } |
162 | ||
163 | qstr->hash = end_name_hash(hash); | |
164 | return 0; | |
165 | } | |
166 | ||
167 | static int exfat_utf8_d_cmp(const struct dentry *dentry, unsigned int len, | |
168 | const char *str, const struct qstr *name) | |
169 | { | |
170 | struct super_block *sb = dentry->d_sb; | |
9ec784bf VK |
171 | unsigned int alen = exfat_striptail_len(name->len, name->name, |
172 | EXFAT_SB(sb)->options.keep_last_dots); | |
173 | unsigned int blen = exfat_striptail_len(len, str, | |
174 | EXFAT_SB(sb)->options.keep_last_dots); | |
175 | ||
5f2aa075 NJ |
176 | unicode_t u_a, u_b; |
177 | int charlen, i; | |
178 | ||
179 | if (alen != blen) | |
180 | return 1; | |
181 | ||
182 | for (i = 0; i < alen; i += charlen) { | |
183 | charlen = utf8_to_utf32(&name->name[i], alen - i, &u_a); | |
184 | if (charlen < 0) | |
185 | return 1; | |
186 | if (charlen != utf8_to_utf32(&str[i], blen - i, &u_b)) | |
187 | return 1; | |
188 | ||
189 | if (u_a <= 0xFFFF && u_b <= 0xFFFF) { | |
190 | if (exfat_toupper(sb, u_a) != exfat_toupper(sb, u_b)) | |
191 | return 1; | |
5f2aa075 | 192 | } else { |
197298a6 PR |
193 | if (u_a != u_b) |
194 | return 1; | |
5f2aa075 NJ |
195 | } |
196 | } | |
197 | ||
198 | return 0; | |
199 | } | |
200 | ||
201 | const struct dentry_operations exfat_utf8_dentry_ops = { | |
202 | .d_revalidate = exfat_d_revalidate, | |
203 | .d_hash = exfat_utf8_d_hash, | |
204 | .d_compare = exfat_utf8_d_cmp, | |
205 | }; | |
206 | ||
207 | /* used only in search empty_slot() */ | |
208 | #define CNT_UNUSED_NOHIT (-1) | |
209 | #define CNT_UNUSED_HIT (-2) | |
210 | /* search EMPTY CONTINUOUS "num_entries" entries */ | |
211 | static int exfat_search_empty_slot(struct super_block *sb, | |
212 | struct exfat_hint_femp *hint_femp, struct exfat_chain *p_dir, | |
213 | int num_entries) | |
214 | { | |
215 | int i, dentry, num_empty = 0; | |
216 | int dentries_per_clu; | |
217 | unsigned int type; | |
218 | struct exfat_chain clu; | |
219 | struct exfat_dentry *ep; | |
220 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
221 | struct buffer_head *bh; | |
222 | ||
223 | dentries_per_clu = sbi->dentries_per_clu; | |
224 | ||
225 | if (hint_femp->eidx != EXFAT_HINT_NONE) { | |
226 | dentry = hint_femp->eidx; | |
227 | if (num_entries <= hint_femp->count) { | |
228 | hint_femp->eidx = EXFAT_HINT_NONE; | |
229 | return dentry; | |
230 | } | |
231 | ||
232 | exfat_chain_dup(&clu, &hint_femp->cur); | |
233 | } else { | |
234 | exfat_chain_dup(&clu, p_dir); | |
235 | dentry = 0; | |
236 | } | |
237 | ||
238 | while (clu.dir != EXFAT_EOF_CLUSTER) { | |
239 | i = dentry & (dentries_per_clu - 1); | |
240 | ||
241 | for (; i < dentries_per_clu; i++, dentry++) { | |
c71510b3 | 242 | ep = exfat_get_dentry(sb, &clu, i, &bh); |
5f2aa075 NJ |
243 | if (!ep) |
244 | return -EIO; | |
245 | type = exfat_get_entry_type(ep); | |
246 | brelse(bh); | |
247 | ||
248 | if (type == TYPE_UNUSED || type == TYPE_DELETED) { | |
249 | num_empty++; | |
250 | if (hint_femp->eidx == EXFAT_HINT_NONE) { | |
251 | hint_femp->eidx = dentry; | |
252 | hint_femp->count = CNT_UNUSED_NOHIT; | |
253 | exfat_chain_set(&hint_femp->cur, | |
254 | clu.dir, clu.size, clu.flags); | |
255 | } | |
256 | ||
257 | if (type == TYPE_UNUSED && | |
258 | hint_femp->count != CNT_UNUSED_HIT) | |
259 | hint_femp->count = CNT_UNUSED_HIT; | |
260 | } else { | |
261 | if (hint_femp->eidx != EXFAT_HINT_NONE && | |
262 | hint_femp->count == CNT_UNUSED_HIT) { | |
263 | /* unused empty group means | |
264 | * an empty group which includes | |
265 | * unused dentry | |
266 | */ | |
267 | exfat_fs_error(sb, | |
268 | "found bogus dentry(%d) beyond unused empty group(%d) (start_clu : %u, cur_clu : %u)", | |
269 | dentry, hint_femp->eidx, | |
270 | p_dir->dir, clu.dir); | |
271 | return -EIO; | |
272 | } | |
273 | ||
274 | num_empty = 0; | |
275 | hint_femp->eidx = EXFAT_HINT_NONE; | |
276 | } | |
277 | ||
278 | if (num_empty >= num_entries) { | |
279 | /* found and invalidate hint_femp */ | |
280 | hint_femp->eidx = EXFAT_HINT_NONE; | |
281 | return (dentry - (num_entries - 1)); | |
282 | } | |
283 | } | |
284 | ||
285 | if (clu.flags == ALLOC_NO_FAT_CHAIN) { | |
286 | if (--clu.size > 0) | |
287 | clu.dir++; | |
288 | else | |
289 | clu.dir = EXFAT_EOF_CLUSTER; | |
290 | } else { | |
291 | if (exfat_get_next_cluster(sb, &clu.dir)) | |
292 | return -EIO; | |
293 | } | |
294 | } | |
295 | ||
296 | return -ENOSPC; | |
297 | } | |
298 | ||
299 | static int exfat_check_max_dentries(struct inode *inode) | |
300 | { | |
301 | if (EXFAT_B_TO_DEN(i_size_read(inode)) >= MAX_EXFAT_DENTRIES) { | |
302 | /* | |
9e456aea | 303 | * exFAT spec allows a dir to grow up to 8388608(256MB) |
5f2aa075 NJ |
304 | * dentries |
305 | */ | |
306 | return -ENOSPC; | |
307 | } | |
308 | return 0; | |
309 | } | |
310 | ||
311 | /* find empty directory entry. | |
312 | * if there isn't any empty slot, expand cluster chain. | |
313 | */ | |
314 | static int exfat_find_empty_entry(struct inode *inode, | |
315 | struct exfat_chain *p_dir, int num_entries) | |
316 | { | |
317 | int dentry; | |
318 | unsigned int ret, last_clu; | |
5f2aa075 NJ |
319 | loff_t size = 0; |
320 | struct exfat_chain clu; | |
5f2aa075 NJ |
321 | struct super_block *sb = inode->i_sb; |
322 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
323 | struct exfat_inode_info *ei = EXFAT_I(inode); | |
324 | struct exfat_hint_femp hint_femp; | |
325 | ||
326 | hint_femp.eidx = EXFAT_HINT_NONE; | |
327 | ||
328 | if (ei->hint_femp.eidx != EXFAT_HINT_NONE) { | |
a7a24168 | 329 | hint_femp = ei->hint_femp; |
5f2aa075 NJ |
330 | ei->hint_femp.eidx = EXFAT_HINT_NONE; |
331 | } | |
332 | ||
333 | while ((dentry = exfat_search_empty_slot(sb, &hint_femp, p_dir, | |
334 | num_entries)) < 0) { | |
335 | if (dentry == -EIO) | |
336 | break; | |
337 | ||
338 | if (exfat_check_max_dentries(inode)) | |
339 | return -ENOSPC; | |
340 | ||
341 | /* we trust p_dir->size regardless of FAT type */ | |
342 | if (exfat_find_last_cluster(sb, p_dir, &last_clu)) | |
343 | return -EIO; | |
344 | ||
345 | /* | |
346 | * Allocate new cluster to this directory | |
347 | */ | |
348 | exfat_chain_set(&clu, last_clu + 1, 0, p_dir->flags); | |
349 | ||
350 | /* allocate a cluster */ | |
23befe49 | 351 | ret = exfat_alloc_cluster(inode, 1, &clu, IS_DIRSYNC(inode)); |
5f2aa075 NJ |
352 | if (ret) |
353 | return ret; | |
354 | ||
355 | if (exfat_zeroed_cluster(inode, clu.dir)) | |
356 | return -EIO; | |
357 | ||
358 | /* append to the FAT chain */ | |
359 | if (clu.flags != p_dir->flags) { | |
360 | /* no-fat-chain bit is disabled, | |
361 | * so fat-chain should be synced with alloc-bitmap | |
362 | */ | |
363 | exfat_chain_cont_cluster(sb, p_dir->dir, p_dir->size); | |
364 | p_dir->flags = ALLOC_FAT_CHAIN; | |
365 | hint_femp.cur.flags = ALLOC_FAT_CHAIN; | |
366 | } | |
367 | ||
368 | if (clu.flags == ALLOC_FAT_CHAIN) | |
369 | if (exfat_ent_set(sb, last_clu, clu.dir)) | |
370 | return -EIO; | |
371 | ||
372 | if (hint_femp.eidx == EXFAT_HINT_NONE) { | |
373 | /* the special case that new dentry | |
374 | * should be allocated from the start of new cluster | |
375 | */ | |
376 | hint_femp.eidx = EXFAT_B_TO_DEN_IDX(p_dir->size, sbi); | |
377 | hint_femp.count = sbi->dentries_per_clu; | |
378 | ||
379 | exfat_chain_set(&hint_femp.cur, clu.dir, 0, clu.flags); | |
380 | } | |
381 | hint_femp.cur.size++; | |
382 | p_dir->size++; | |
383 | size = EXFAT_CLU_TO_B(p_dir->size, sbi); | |
384 | ||
5f2aa075 NJ |
385 | /* directory inode should be updated in here */ |
386 | i_size_write(inode, size); | |
7dee6f57 CVB |
387 | ei->i_size_ondisk += sbi->cluster_size; |
388 | ei->i_size_aligned += sbi->cluster_size; | |
389 | ei->flags = p_dir->flags; | |
5f2aa075 NJ |
390 | inode->i_blocks += 1 << sbi->sect_per_clus_bits; |
391 | } | |
392 | ||
393 | return dentry; | |
394 | } | |
395 | ||
396 | /* | |
397 | * Name Resolution Functions : | |
398 | * Zero if it was successful; otherwise nonzero. | |
399 | */ | |
400 | static int __exfat_resolve_path(struct inode *inode, const unsigned char *path, | |
401 | struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname, | |
402 | int lookup) | |
403 | { | |
404 | int namelen; | |
405 | int lossy = NLS_NAME_NO_LOSSY; | |
406 | struct super_block *sb = inode->i_sb; | |
407 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
408 | struct exfat_inode_info *ei = EXFAT_I(inode); | |
9ec784bf | 409 | int pathlen = strlen(path); |
5f2aa075 | 410 | |
9ec784bf VK |
411 | /* |
412 | * get the length of the pathname excluding | |
413 | * trailing periods, if any. | |
414 | */ | |
415 | namelen = exfat_striptail_len(pathlen, path, false); | |
416 | if (EXFAT_SB(sb)->options.keep_last_dots) { | |
417 | /* | |
418 | * Do not allow the creation of files with names | |
419 | * ending with period(s). | |
420 | */ | |
421 | if (!lookup && (namelen < pathlen)) | |
422 | return -EINVAL; | |
423 | namelen = pathlen; | |
424 | } | |
5f2aa075 NJ |
425 | if (!namelen) |
426 | return -ENOENT; | |
9ec784bf | 427 | if (pathlen > (MAX_NAME_LENGTH * MAX_CHARSET_SIZE)) |
5f2aa075 NJ |
428 | return -ENAMETOOLONG; |
429 | ||
430 | /* | |
431 | * strip all leading spaces : | |
432 | * "MS windows 7" supports leading spaces. | |
433 | * So we should skip this preprocessing for compatibility. | |
434 | */ | |
435 | ||
436 | /* file name conversion : | |
437 | * If lookup case, we allow bad-name for compatibility. | |
438 | */ | |
439 | namelen = exfat_nls_to_utf16(sb, path, namelen, p_uniname, | |
440 | &lossy); | |
441 | if (namelen < 0) | |
442 | return namelen; /* return error value */ | |
443 | ||
444 | if ((lossy && !lookup) || !namelen) | |
86da53e8 | 445 | return (lossy & NLS_NAME_OVERLEN) ? -ENAMETOOLONG : -EINVAL; |
5f2aa075 NJ |
446 | |
447 | exfat_chain_set(p_dir, ei->start_clu, | |
448 | EXFAT_B_TO_CLU(i_size_read(inode), sbi), ei->flags); | |
449 | ||
450 | return 0; | |
451 | } | |
452 | ||
453 | static inline int exfat_resolve_path(struct inode *inode, | |
454 | const unsigned char *path, struct exfat_chain *dir, | |
455 | struct exfat_uni_name *uni) | |
456 | { | |
457 | return __exfat_resolve_path(inode, path, dir, uni, 0); | |
458 | } | |
459 | ||
460 | static inline int exfat_resolve_path_for_lookup(struct inode *inode, | |
461 | const unsigned char *path, struct exfat_chain *dir, | |
462 | struct exfat_uni_name *uni) | |
463 | { | |
464 | return __exfat_resolve_path(inode, path, dir, uni, 1); | |
465 | } | |
466 | ||
467 | static inline loff_t exfat_make_i_pos(struct exfat_dir_entry *info) | |
468 | { | |
469 | return ((loff_t) info->dir.dir << 32) | (info->entry & 0xffffffff); | |
470 | } | |
471 | ||
472 | static int exfat_add_entry(struct inode *inode, const char *path, | |
473 | struct exfat_chain *p_dir, unsigned int type, | |
474 | struct exfat_dir_entry *info) | |
475 | { | |
476 | int ret, dentry, num_entries; | |
477 | struct super_block *sb = inode->i_sb; | |
478 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
479 | struct exfat_uni_name uniname; | |
480 | struct exfat_chain clu; | |
481 | int clu_size = 0; | |
482 | unsigned int start_clu = EXFAT_FREE_CLUSTER; | |
483 | ||
484 | ret = exfat_resolve_path(inode, path, p_dir, &uniname); | |
485 | if (ret) | |
486 | goto out; | |
487 | ||
488 | num_entries = exfat_calc_num_entries(&uniname); | |
489 | if (num_entries < 0) { | |
490 | ret = num_entries; | |
491 | goto out; | |
492 | } | |
493 | ||
494 | /* exfat_find_empty_entry must be called before alloc_cluster() */ | |
495 | dentry = exfat_find_empty_entry(inode, p_dir, num_entries); | |
496 | if (dentry < 0) { | |
497 | ret = dentry; /* -EIO or -ENOSPC */ | |
498 | goto out; | |
499 | } | |
500 | ||
501 | if (type == TYPE_DIR) { | |
502 | ret = exfat_alloc_new_dir(inode, &clu); | |
503 | if (ret) | |
504 | goto out; | |
505 | start_clu = clu.dir; | |
506 | clu_size = sbi->cluster_size; | |
507 | } | |
508 | ||
509 | /* update the directory entry */ | |
510 | /* fill the dos name directory entry information of the created file. | |
511 | * the first cluster is not determined yet. (0) | |
512 | */ | |
513 | ret = exfat_init_dir_entry(inode, p_dir, dentry, type, | |
514 | start_clu, clu_size); | |
515 | if (ret) | |
516 | goto out; | |
517 | ||
518 | ret = exfat_init_ext_entry(inode, p_dir, dentry, num_entries, &uniname); | |
519 | if (ret) | |
520 | goto out; | |
521 | ||
a7a24168 | 522 | info->dir = *p_dir; |
5f2aa075 NJ |
523 | info->entry = dentry; |
524 | info->flags = ALLOC_NO_FAT_CHAIN; | |
525 | info->type = type; | |
526 | ||
527 | if (type == TYPE_FILE) { | |
528 | info->attr = ATTR_ARCHIVE; | |
529 | info->start_clu = EXFAT_EOF_CLUSTER; | |
530 | info->size = 0; | |
531 | info->num_subdirs = 0; | |
532 | } else { | |
5f2aa075 NJ |
533 | info->attr = ATTR_SUBDIR; |
534 | info->start_clu = start_clu; | |
535 | info->size = clu_size; | |
6c958a09 | 536 | info->num_subdirs = EXFAT_MIN_SUBDIR; |
5f2aa075 NJ |
537 | } |
538 | memset(&info->crtime, 0, sizeof(info->crtime)); | |
539 | memset(&info->mtime, 0, sizeof(info->mtime)); | |
540 | memset(&info->atime, 0, sizeof(info->atime)); | |
541 | out: | |
542 | return ret; | |
543 | } | |
544 | ||
549c7297 CB |
545 | static int exfat_create(struct user_namespace *mnt_userns, struct inode *dir, |
546 | struct dentry *dentry, umode_t mode, bool excl) | |
5f2aa075 NJ |
547 | { |
548 | struct super_block *sb = dir->i_sb; | |
549 | struct inode *inode; | |
550 | struct exfat_chain cdir; | |
551 | struct exfat_dir_entry info; | |
552 | loff_t i_pos; | |
553 | int err; | |
554 | ||
555 | mutex_lock(&EXFAT_SB(sb)->s_lock); | |
7018ec68 | 556 | exfat_set_volume_dirty(sb); |
5f2aa075 NJ |
557 | err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_FILE, |
558 | &info); | |
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; | |
c6e2f52e HK |
599 | /* for optimized dir & entry to prevent long traverse of cluster chain */ |
600 | struct exfat_hint hint_opt; | |
5f2aa075 NJ |
601 | |
602 | if (qname->len == 0) | |
603 | return -ENOENT; | |
604 | ||
605 | /* check the validity of directory name in the given pathname */ | |
606 | ret = exfat_resolve_path_for_lookup(dir, qname->name, &cdir, &uni_name); | |
607 | if (ret) | |
608 | return ret; | |
609 | ||
610 | num_entries = exfat_calc_num_entries(&uni_name); | |
611 | if (num_entries < 0) | |
612 | return num_entries; | |
613 | ||
614 | /* check the validation of hint_stat and initialize it if required */ | |
615 | if (ei->version != (inode_peek_iversion_raw(dir) & 0xffffffff)) { | |
616 | ei->hint_stat.clu = cdir.dir; | |
617 | ei->hint_stat.eidx = 0; | |
618 | ei->version = (inode_peek_iversion_raw(dir) & 0xffffffff); | |
619 | ei->hint_femp.eidx = EXFAT_HINT_NONE; | |
620 | } | |
621 | ||
622 | /* search the file name for directories */ | |
623 | dentry = exfat_find_dir_entry(sb, ei, &cdir, &uni_name, | |
c6e2f52e | 624 | num_entries, TYPE_ALL, &hint_opt); |
5f2aa075 | 625 | |
188df41f | 626 | if (dentry < 0) |
5f2aa075 NJ |
627 | return dentry; /* -error value */ |
628 | ||
a7a24168 | 629 | info->dir = cdir; |
5f2aa075 NJ |
630 | info->entry = dentry; |
631 | info->num_subdirs = 0; | |
632 | ||
c6e2f52e HK |
633 | /* adjust cdir to the optimized value */ |
634 | cdir.dir = hint_opt.clu; | |
635 | if (cdir.flags & ALLOC_NO_FAT_CHAIN) | |
636 | cdir.size -= dentry / sbi->dentries_per_clu; | |
637 | dentry = hint_opt.eidx; | |
188df41f TK |
638 | es = exfat_get_dentry_set(sb, &cdir, dentry, ES_2_ENTRIES); |
639 | if (!es) | |
640 | return -EIO; | |
641 | ep = exfat_get_dentry_cached(es, 0); | |
642 | ep2 = exfat_get_dentry_cached(es, 1); | |
643 | ||
644 | info->type = exfat_get_entry_type(ep); | |
645 | info->attr = le16_to_cpu(ep->dentry.file.attr); | |
646 | info->size = le64_to_cpu(ep2->dentry.stream.valid_size); | |
647 | if ((info->type == TYPE_FILE) && (info->size == 0)) { | |
648 | info->flags = ALLOC_NO_FAT_CHAIN; | |
649 | info->start_clu = EXFAT_EOF_CLUSTER; | |
650 | } else { | |
651 | info->flags = ep2->dentry.stream.flags; | |
652 | info->start_clu = | |
653 | le32_to_cpu(ep2->dentry.stream.start_clu); | |
654 | } | |
5f2aa075 | 655 | |
188df41f TK |
656 | exfat_get_entry_time(sbi, &info->crtime, |
657 | ep->dentry.file.create_tz, | |
658 | ep->dentry.file.create_time, | |
659 | ep->dentry.file.create_date, | |
660 | ep->dentry.file.create_time_cs); | |
661 | exfat_get_entry_time(sbi, &info->mtime, | |
662 | ep->dentry.file.modify_tz, | |
663 | ep->dentry.file.modify_time, | |
664 | ep->dentry.file.modify_date, | |
665 | ep->dentry.file.modify_time_cs); | |
666 | exfat_get_entry_time(sbi, &info->atime, | |
667 | ep->dentry.file.access_tz, | |
668 | ep->dentry.file.access_time, | |
669 | ep->dentry.file.access_date, | |
670 | 0); | |
671 | exfat_free_dentry_set(es, false); | |
672 | ||
673 | if (ei->start_clu == EXFAT_FREE_CLUSTER) { | |
674 | exfat_fs_error(sb, | |
675 | "non-zero size file starts with zero cluster (size : %llu, p_dir : %u, entry : 0x%08x)", | |
676 | i_size_read(dir), ei->dir.dir, ei->entry); | |
677 | return -EIO; | |
678 | } | |
5f2aa075 | 679 | |
188df41f TK |
680 | if (info->type == TYPE_DIR) { |
681 | exfat_chain_set(&cdir, info->start_clu, | |
682 | EXFAT_B_TO_CLU(info->size, sbi), info->flags); | |
5f2aa075 NJ |
683 | count = exfat_count_dir_entries(sb, &cdir); |
684 | if (count < 0) | |
685 | return -EIO; | |
686 | ||
188df41f | 687 | info->num_subdirs = count + EXFAT_MIN_SUBDIR; |
5f2aa075 NJ |
688 | } |
689 | return 0; | |
690 | } | |
691 | ||
692 | static int exfat_d_anon_disconn(struct dentry *dentry) | |
693 | { | |
694 | return IS_ROOT(dentry) && (dentry->d_flags & DCACHE_DISCONNECTED); | |
695 | } | |
696 | ||
697 | static struct dentry *exfat_lookup(struct inode *dir, struct dentry *dentry, | |
698 | unsigned int flags) | |
699 | { | |
700 | struct super_block *sb = dir->i_sb; | |
701 | struct inode *inode; | |
702 | struct dentry *alias; | |
703 | struct exfat_dir_entry info; | |
704 | int err; | |
705 | loff_t i_pos; | |
706 | mode_t i_mode; | |
707 | ||
708 | mutex_lock(&EXFAT_SB(sb)->s_lock); | |
709 | err = exfat_find(dir, &dentry->d_name, &info); | |
710 | if (err) { | |
711 | if (err == -ENOENT) { | |
712 | inode = NULL; | |
713 | goto out; | |
714 | } | |
715 | goto unlock; | |
716 | } | |
717 | ||
718 | i_pos = exfat_make_i_pos(&info); | |
719 | inode = exfat_build_inode(sb, &info, i_pos); | |
d6c9efd9 TK |
720 | err = PTR_ERR_OR_ZERO(inode); |
721 | if (err) | |
5f2aa075 | 722 | goto unlock; |
5f2aa075 NJ |
723 | |
724 | i_mode = inode->i_mode; | |
725 | alias = d_find_alias(inode); | |
726 | ||
727 | /* | |
728 | * Checking "alias->d_parent == dentry->d_parent" to make sure | |
729 | * FS is not corrupted (especially double linked dir). | |
730 | */ | |
731 | if (alias && alias->d_parent == dentry->d_parent && | |
732 | !exfat_d_anon_disconn(alias)) { | |
733 | ||
734 | /* | |
735 | * Unhashed alias is able to exist because of revalidate() | |
736 | * called by lookup_fast. You can easily make this status | |
737 | * by calling create and lookup concurrently | |
738 | * In such case, we reuse an alias instead of new dentry | |
739 | */ | |
740 | if (d_unhashed(alias)) { | |
741 | WARN_ON(alias->d_name.hash_len != | |
742 | dentry->d_name.hash_len); | |
d1727d55 JP |
743 | exfat_info(sb, "rehashed a dentry(%p) in read lookup", |
744 | alias); | |
5f2aa075 NJ |
745 | d_drop(dentry); |
746 | d_rehash(alias); | |
747 | } else if (!S_ISDIR(i_mode)) { | |
748 | /* | |
749 | * This inode has non anonymous-DCACHE_DISCONNECTED | |
750 | * dentry. This means, the user did ->lookup() by an | |
751 | * another name (longname vs 8.3 alias of it) in past. | |
752 | * | |
753 | * Switch to new one for reason of locality if possible. | |
754 | */ | |
755 | d_move(alias, dentry); | |
756 | } | |
757 | iput(inode); | |
758 | mutex_unlock(&EXFAT_SB(sb)->s_lock); | |
759 | return alias; | |
760 | } | |
761 | dput(alias); | |
762 | out: | |
763 | mutex_unlock(&EXFAT_SB(sb)->s_lock); | |
764 | if (!inode) | |
765 | exfat_d_version_set(dentry, inode_query_iversion(dir)); | |
766 | ||
767 | return d_splice_alias(inode, dentry); | |
768 | unlock: | |
769 | mutex_unlock(&EXFAT_SB(sb)->s_lock); | |
770 | return ERR_PTR(err); | |
771 | } | |
772 | ||
773 | /* remove an entry, BUT don't truncate */ | |
774 | static int exfat_unlink(struct inode *dir, struct dentry *dentry) | |
775 | { | |
776 | struct exfat_chain cdir; | |
777 | struct exfat_dentry *ep; | |
778 | struct super_block *sb = dir->i_sb; | |
779 | struct inode *inode = dentry->d_inode; | |
780 | struct exfat_inode_info *ei = EXFAT_I(inode); | |
781 | struct buffer_head *bh; | |
5f2aa075 NJ |
782 | int num_entries, entry, err = 0; |
783 | ||
784 | mutex_lock(&EXFAT_SB(sb)->s_lock); | |
785 | exfat_chain_dup(&cdir, &ei->dir); | |
786 | entry = ei->entry; | |
787 | if (ei->dir.dir == DIR_DELETED) { | |
d1727d55 | 788 | exfat_err(sb, "abnormal access to deleted dentry"); |
5f2aa075 NJ |
789 | err = -ENOENT; |
790 | goto unlock; | |
791 | } | |
792 | ||
c71510b3 | 793 | ep = exfat_get_dentry(sb, &cdir, entry, &bh); |
5f2aa075 NJ |
794 | if (!ep) { |
795 | err = -EIO; | |
796 | goto unlock; | |
797 | } | |
798 | num_entries = exfat_count_ext_entries(sb, &cdir, entry, ep); | |
799 | if (num_entries < 0) { | |
800 | err = -EIO; | |
801 | brelse(bh); | |
802 | goto unlock; | |
803 | } | |
804 | num_entries++; | |
805 | brelse(bh); | |
806 | ||
7018ec68 | 807 | exfat_set_volume_dirty(sb); |
5f2aa075 NJ |
808 | /* update the directory entry */ |
809 | if (exfat_remove_entries(dir, &cdir, entry, 0, num_entries)) { | |
810 | err = -EIO; | |
811 | goto unlock; | |
812 | } | |
813 | ||
814 | /* This doesn't modify ei */ | |
815 | ei->dir.dir = DIR_DELETED; | |
5f2aa075 NJ |
816 | |
817 | inode_inc_iversion(dir); | |
818 | dir->i_mtime = dir->i_atime = current_time(dir); | |
81df1ad4 | 819 | exfat_truncate_atime(&dir->i_atime); |
5f2aa075 NJ |
820 | if (IS_DIRSYNC(dir)) |
821 | exfat_sync_inode(dir); | |
822 | else | |
823 | mark_inode_dirty(dir); | |
824 | ||
825 | clear_nlink(inode); | |
826 | inode->i_mtime = inode->i_atime = current_time(inode); | |
81df1ad4 | 827 | exfat_truncate_atime(&inode->i_atime); |
5f2aa075 NJ |
828 | exfat_unhash_inode(inode); |
829 | exfat_d_version_set(dentry, inode_query_iversion(dir)); | |
830 | unlock: | |
831 | mutex_unlock(&EXFAT_SB(sb)->s_lock); | |
832 | return err; | |
833 | } | |
834 | ||
549c7297 CB |
835 | static int exfat_mkdir(struct user_namespace *mnt_userns, struct inode *dir, |
836 | struct dentry *dentry, umode_t mode) | |
5f2aa075 NJ |
837 | { |
838 | struct super_block *sb = dir->i_sb; | |
839 | struct inode *inode; | |
840 | struct exfat_dir_entry info; | |
841 | struct exfat_chain cdir; | |
842 | loff_t i_pos; | |
843 | int err; | |
844 | ||
845 | mutex_lock(&EXFAT_SB(sb)->s_lock); | |
7018ec68 | 846 | exfat_set_volume_dirty(sb); |
5f2aa075 NJ |
847 | err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_DIR, |
848 | &info); | |
5f2aa075 NJ |
849 | if (err) |
850 | goto unlock; | |
851 | ||
852 | inode_inc_iversion(dir); | |
853 | dir->i_ctime = dir->i_mtime = current_time(dir); | |
854 | if (IS_DIRSYNC(dir)) | |
855 | exfat_sync_inode(dir); | |
856 | else | |
857 | mark_inode_dirty(dir); | |
858 | inc_nlink(dir); | |
859 | ||
860 | i_pos = exfat_make_i_pos(&info); | |
861 | inode = exfat_build_inode(sb, &info, i_pos); | |
d6c9efd9 TK |
862 | err = PTR_ERR_OR_ZERO(inode); |
863 | if (err) | |
5f2aa075 | 864 | goto unlock; |
5f2aa075 NJ |
865 | |
866 | inode_inc_iversion(inode); | |
867 | inode->i_mtime = inode->i_atime = inode->i_ctime = | |
868 | EXFAT_I(inode)->i_crtime = current_time(inode); | |
81df1ad4 | 869 | exfat_truncate_atime(&inode->i_atime); |
5f2aa075 NJ |
870 | /* timestamp is already written, so mark_inode_dirty() is unneeded. */ |
871 | ||
872 | d_instantiate(dentry, inode); | |
873 | ||
874 | unlock: | |
875 | mutex_unlock(&EXFAT_SB(sb)->s_lock); | |
876 | return err; | |
877 | } | |
878 | ||
879 | static int exfat_check_dir_empty(struct super_block *sb, | |
880 | struct exfat_chain *p_dir) | |
881 | { | |
882 | int i, dentries_per_clu; | |
883 | unsigned int type; | |
884 | struct exfat_chain clu; | |
885 | struct exfat_dentry *ep; | |
886 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
887 | struct buffer_head *bh; | |
888 | ||
889 | dentries_per_clu = sbi->dentries_per_clu; | |
890 | ||
891 | exfat_chain_dup(&clu, p_dir); | |
892 | ||
893 | while (clu.dir != EXFAT_EOF_CLUSTER) { | |
894 | for (i = 0; i < dentries_per_clu; i++) { | |
c71510b3 | 895 | ep = exfat_get_dentry(sb, &clu, i, &bh); |
5f2aa075 NJ |
896 | if (!ep) |
897 | return -EIO; | |
898 | type = exfat_get_entry_type(ep); | |
899 | brelse(bh); | |
900 | if (type == TYPE_UNUSED) | |
901 | return 0; | |
902 | ||
903 | if (type != TYPE_FILE && type != TYPE_DIR) | |
904 | continue; | |
905 | ||
906 | return -ENOTEMPTY; | |
907 | } | |
908 | ||
909 | if (clu.flags == ALLOC_NO_FAT_CHAIN) { | |
910 | if (--clu.size > 0) | |
911 | clu.dir++; | |
912 | else | |
913 | clu.dir = EXFAT_EOF_CLUSTER; | |
914 | } else { | |
915 | if (exfat_get_next_cluster(sb, &(clu.dir))) | |
916 | return -EIO; | |
917 | } | |
918 | } | |
919 | ||
920 | return 0; | |
921 | } | |
922 | ||
923 | static int exfat_rmdir(struct inode *dir, struct dentry *dentry) | |
924 | { | |
925 | struct inode *inode = dentry->d_inode; | |
926 | struct exfat_dentry *ep; | |
927 | struct exfat_chain cdir, clu_to_free; | |
928 | struct super_block *sb = inode->i_sb; | |
929 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
930 | struct exfat_inode_info *ei = EXFAT_I(inode); | |
931 | struct buffer_head *bh; | |
5f2aa075 NJ |
932 | int num_entries, entry, err; |
933 | ||
934 | mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock); | |
935 | ||
936 | exfat_chain_dup(&cdir, &ei->dir); | |
937 | entry = ei->entry; | |
938 | ||
939 | if (ei->dir.dir == DIR_DELETED) { | |
d1727d55 | 940 | exfat_err(sb, "abnormal access to deleted dentry"); |
5f2aa075 NJ |
941 | err = -ENOENT; |
942 | goto unlock; | |
943 | } | |
944 | ||
5f2aa075 NJ |
945 | exfat_chain_set(&clu_to_free, ei->start_clu, |
946 | EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode), sbi), ei->flags); | |
947 | ||
948 | err = exfat_check_dir_empty(sb, &clu_to_free); | |
949 | if (err) { | |
950 | if (err == -EIO) | |
d1727d55 JP |
951 | exfat_err(sb, "failed to exfat_check_dir_empty : err(%d)", |
952 | err); | |
5f2aa075 NJ |
953 | goto unlock; |
954 | } | |
955 | ||
c71510b3 | 956 | ep = exfat_get_dentry(sb, &cdir, entry, &bh); |
5f2aa075 NJ |
957 | if (!ep) { |
958 | err = -EIO; | |
959 | goto unlock; | |
960 | } | |
961 | ||
962 | num_entries = exfat_count_ext_entries(sb, &cdir, entry, ep); | |
963 | if (num_entries < 0) { | |
964 | err = -EIO; | |
965 | brelse(bh); | |
966 | goto unlock; | |
967 | } | |
968 | num_entries++; | |
969 | brelse(bh); | |
970 | ||
7018ec68 | 971 | exfat_set_volume_dirty(sb); |
5f2aa075 NJ |
972 | err = exfat_remove_entries(dir, &cdir, entry, 0, num_entries); |
973 | if (err) { | |
d1727d55 | 974 | exfat_err(sb, "failed to exfat_remove_entries : err(%d)", err); |
5f2aa075 NJ |
975 | goto unlock; |
976 | } | |
977 | ei->dir.dir = DIR_DELETED; | |
5f2aa075 NJ |
978 | |
979 | inode_inc_iversion(dir); | |
980 | dir->i_mtime = dir->i_atime = current_time(dir); | |
81df1ad4 | 981 | exfat_truncate_atime(&dir->i_atime); |
5f2aa075 NJ |
982 | if (IS_DIRSYNC(dir)) |
983 | exfat_sync_inode(dir); | |
984 | else | |
985 | mark_inode_dirty(dir); | |
986 | drop_nlink(dir); | |
987 | ||
988 | clear_nlink(inode); | |
989 | inode->i_mtime = inode->i_atime = current_time(inode); | |
81df1ad4 | 990 | exfat_truncate_atime(&inode->i_atime); |
5f2aa075 NJ |
991 | exfat_unhash_inode(inode); |
992 | exfat_d_version_set(dentry, inode_query_iversion(dir)); | |
993 | unlock: | |
994 | mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock); | |
995 | return err; | |
996 | } | |
997 | ||
998 | static int exfat_rename_file(struct inode *inode, struct exfat_chain *p_dir, | |
999 | int oldentry, struct exfat_uni_name *p_uniname, | |
1000 | struct exfat_inode_info *ei) | |
1001 | { | |
1002 | int ret, num_old_entries, num_new_entries; | |
5f2aa075 NJ |
1003 | struct exfat_dentry *epold, *epnew; |
1004 | struct super_block *sb = inode->i_sb; | |
1005 | struct buffer_head *new_bh, *old_bh; | |
1006 | int sync = IS_DIRSYNC(inode); | |
1007 | ||
c71510b3 | 1008 | epold = exfat_get_dentry(sb, p_dir, oldentry, &old_bh); |
5f2aa075 NJ |
1009 | if (!epold) |
1010 | return -EIO; | |
1011 | ||
1012 | num_old_entries = exfat_count_ext_entries(sb, p_dir, oldentry, epold); | |
1013 | if (num_old_entries < 0) | |
1014 | return -EIO; | |
1015 | num_old_entries++; | |
1016 | ||
1017 | num_new_entries = exfat_calc_num_entries(p_uniname); | |
1018 | if (num_new_entries < 0) | |
1019 | return num_new_entries; | |
1020 | ||
1021 | if (num_old_entries < num_new_entries) { | |
1022 | int newentry; | |
1023 | ||
1024 | newentry = | |
1025 | exfat_find_empty_entry(inode, p_dir, num_new_entries); | |
1026 | if (newentry < 0) | |
1027 | return newentry; /* -EIO or -ENOSPC */ | |
1028 | ||
c71510b3 | 1029 | epnew = exfat_get_dentry(sb, p_dir, newentry, &new_bh); |
5f2aa075 NJ |
1030 | if (!epnew) |
1031 | return -EIO; | |
1032 | ||
a7a24168 | 1033 | *epnew = *epold; |
5f2aa075 NJ |
1034 | if (exfat_get_entry_type(epnew) == TYPE_FILE) { |
1035 | epnew->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE); | |
1036 | ei->attr |= ATTR_ARCHIVE; | |
1037 | } | |
2c7f8937 | 1038 | exfat_update_bh(new_bh, sync); |
5f2aa075 NJ |
1039 | brelse(old_bh); |
1040 | brelse(new_bh); | |
1041 | ||
c71510b3 | 1042 | epold = exfat_get_dentry(sb, p_dir, oldentry + 1, &old_bh); |
e8dd3cda DC |
1043 | if (!epold) |
1044 | return -EIO; | |
c71510b3 | 1045 | epnew = exfat_get_dentry(sb, p_dir, newentry + 1, &new_bh); |
e8dd3cda DC |
1046 | if (!epnew) { |
1047 | brelse(old_bh); | |
5f2aa075 | 1048 | return -EIO; |
e8dd3cda | 1049 | } |
5f2aa075 | 1050 | |
a7a24168 | 1051 | *epnew = *epold; |
2c7f8937 | 1052 | exfat_update_bh(new_bh, sync); |
5f2aa075 NJ |
1053 | brelse(old_bh); |
1054 | brelse(new_bh); | |
1055 | ||
1056 | ret = exfat_init_ext_entry(inode, p_dir, newentry, | |
1057 | num_new_entries, p_uniname); | |
1058 | if (ret) | |
1059 | return ret; | |
1060 | ||
1061 | exfat_remove_entries(inode, p_dir, oldentry, 0, | |
1062 | num_old_entries); | |
d8dad258 | 1063 | ei->dir = *p_dir; |
5f2aa075 NJ |
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; | |
5f2aa075 NJ |
1088 | struct exfat_dentry *epmov, *epnew; |
1089 | struct super_block *sb = inode->i_sb; | |
1090 | struct buffer_head *mov_bh, *new_bh; | |
1091 | ||
c71510b3 | 1092 | epmov = exfat_get_dentry(sb, p_olddir, oldentry, &mov_bh); |
5f2aa075 NJ |
1093 | if (!epmov) |
1094 | return -EIO; | |
1095 | ||
5f2aa075 NJ |
1096 | num_old_entries = exfat_count_ext_entries(sb, p_olddir, oldentry, |
1097 | epmov); | |
1098 | if (num_old_entries < 0) | |
1099 | return -EIO; | |
1100 | num_old_entries++; | |
1101 | ||
1102 | num_new_entries = exfat_calc_num_entries(p_uniname); | |
1103 | if (num_new_entries < 0) | |
1104 | return num_new_entries; | |
1105 | ||
1106 | newentry = exfat_find_empty_entry(inode, p_newdir, num_new_entries); | |
1107 | if (newentry < 0) | |
1108 | return newentry; /* -EIO or -ENOSPC */ | |
1109 | ||
c71510b3 | 1110 | epnew = exfat_get_dentry(sb, p_newdir, newentry, &new_bh); |
5f2aa075 NJ |
1111 | if (!epnew) |
1112 | return -EIO; | |
1113 | ||
a7a24168 | 1114 | *epnew = *epmov; |
5f2aa075 NJ |
1115 | if (exfat_get_entry_type(epnew) == TYPE_FILE) { |
1116 | epnew->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE); | |
1117 | ei->attr |= ATTR_ARCHIVE; | |
1118 | } | |
2c7f8937 | 1119 | exfat_update_bh(new_bh, IS_DIRSYNC(inode)); |
5f2aa075 NJ |
1120 | brelse(mov_bh); |
1121 | brelse(new_bh); | |
1122 | ||
c71510b3 | 1123 | epmov = exfat_get_dentry(sb, p_olddir, oldentry + 1, &mov_bh); |
e8dd3cda DC |
1124 | if (!epmov) |
1125 | return -EIO; | |
c71510b3 | 1126 | epnew = exfat_get_dentry(sb, p_newdir, newentry + 1, &new_bh); |
e8dd3cda DC |
1127 | if (!epnew) { |
1128 | brelse(mov_bh); | |
5f2aa075 | 1129 | return -EIO; |
e8dd3cda | 1130 | } |
5f2aa075 | 1131 | |
a7a24168 | 1132 | *epnew = *epmov; |
2c7f8937 | 1133 | exfat_update_bh(new_bh, IS_DIRSYNC(inode)); |
5f2aa075 NJ |
1134 | brelse(mov_bh); |
1135 | brelse(new_bh); | |
1136 | ||
1137 | ret = exfat_init_ext_entry(inode, p_newdir, newentry, num_new_entries, | |
1138 | p_uniname); | |
1139 | if (ret) | |
1140 | return ret; | |
1141 | ||
1142 | exfat_remove_entries(inode, p_olddir, oldentry, 0, num_old_entries); | |
1143 | ||
1144 | exfat_chain_set(&ei->dir, p_newdir->dir, p_newdir->size, | |
1145 | p_newdir->flags); | |
1146 | ||
1147 | ei->entry = newentry; | |
1148 | return 0; | |
1149 | } | |
1150 | ||
5f2aa075 NJ |
1151 | /* rename or move a old file into a new file */ |
1152 | static int __exfat_rename(struct inode *old_parent_inode, | |
1153 | struct exfat_inode_info *ei, struct inode *new_parent_inode, | |
1154 | struct dentry *new_dentry) | |
1155 | { | |
1156 | int ret; | |
1157 | int dentry; | |
1158 | struct exfat_chain olddir, newdir; | |
1159 | struct exfat_chain *p_dir = NULL; | |
1160 | struct exfat_uni_name uni_name; | |
1161 | struct exfat_dentry *ep; | |
1162 | struct super_block *sb = old_parent_inode->i_sb; | |
1163 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
1164 | const unsigned char *new_path = new_dentry->d_name.name; | |
1165 | struct inode *new_inode = new_dentry->d_inode; | |
1166 | int num_entries; | |
1167 | struct exfat_inode_info *new_ei = NULL; | |
1168 | unsigned int new_entry_type = TYPE_UNUSED; | |
1169 | int new_entry = 0; | |
1170 | struct buffer_head *old_bh, *new_bh = NULL; | |
1171 | ||
1172 | /* check the validity of pointer parameters */ | |
1173 | if (new_path == NULL || strlen(new_path) == 0) | |
1174 | return -EINVAL; | |
1175 | ||
1176 | if (ei->dir.dir == DIR_DELETED) { | |
d1727d55 | 1177 | exfat_err(sb, "abnormal access to deleted source dentry"); |
5f2aa075 NJ |
1178 | return -ENOENT; |
1179 | } | |
1180 | ||
204e6cea SS |
1181 | exfat_chain_set(&olddir, EXFAT_I(old_parent_inode)->start_clu, |
1182 | EXFAT_B_TO_CLU_ROUND_UP(i_size_read(old_parent_inode), sbi), | |
1183 | EXFAT_I(old_parent_inode)->flags); | |
5f2aa075 NJ |
1184 | dentry = ei->entry; |
1185 | ||
c71510b3 | 1186 | ep = exfat_get_dentry(sb, &olddir, dentry, &old_bh); |
5f2aa075 NJ |
1187 | if (!ep) { |
1188 | ret = -EIO; | |
1189 | goto out; | |
1190 | } | |
1191 | brelse(old_bh); | |
1192 | ||
1193 | /* check whether new dir is existing directory and empty */ | |
1194 | if (new_inode) { | |
1195 | ret = -EIO; | |
1196 | new_ei = EXFAT_I(new_inode); | |
1197 | ||
1198 | if (new_ei->dir.dir == DIR_DELETED) { | |
d1727d55 | 1199 | exfat_err(sb, "abnormal access to deleted target dentry"); |
5f2aa075 NJ |
1200 | goto out; |
1201 | } | |
1202 | ||
5f2aa075 NJ |
1203 | p_dir = &(new_ei->dir); |
1204 | new_entry = new_ei->entry; | |
c71510b3 | 1205 | ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh); |
5f2aa075 NJ |
1206 | if (!ep) |
1207 | goto out; | |
1208 | ||
1209 | new_entry_type = exfat_get_entry_type(ep); | |
1210 | brelse(new_bh); | |
1211 | ||
1212 | /* if new_inode exists, update ei */ | |
1213 | if (new_entry_type == TYPE_DIR) { | |
1214 | struct exfat_chain new_clu; | |
1215 | ||
1216 | new_clu.dir = new_ei->start_clu; | |
1217 | new_clu.size = | |
1218 | EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode), | |
1219 | sbi); | |
1220 | new_clu.flags = new_ei->flags; | |
1221 | ||
1222 | ret = exfat_check_dir_empty(sb, &new_clu); | |
1223 | if (ret) | |
1224 | goto out; | |
1225 | } | |
1226 | } | |
1227 | ||
1228 | /* check the validity of directory name in the given new pathname */ | |
1229 | ret = exfat_resolve_path(new_parent_inode, new_path, &newdir, | |
1230 | &uni_name); | |
1231 | if (ret) | |
1232 | goto out; | |
1233 | ||
7018ec68 | 1234 | exfat_set_volume_dirty(sb); |
5f2aa075 NJ |
1235 | |
1236 | if (olddir.dir == newdir.dir) | |
1237 | ret = exfat_rename_file(new_parent_inode, &olddir, dentry, | |
1238 | &uni_name, ei); | |
1239 | else | |
1240 | ret = exfat_move_file(new_parent_inode, &olddir, dentry, | |
1241 | &newdir, &uni_name, ei); | |
1242 | ||
1243 | if (!ret && new_inode) { | |
1244 | /* delete entries of new_dir */ | |
c71510b3 | 1245 | ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh); |
5f2aa075 NJ |
1246 | if (!ep) { |
1247 | ret = -EIO; | |
1248 | goto del_out; | |
1249 | } | |
1250 | ||
1251 | num_entries = exfat_count_ext_entries(sb, p_dir, new_entry, ep); | |
1252 | if (num_entries < 0) { | |
1253 | ret = -EIO; | |
1254 | goto del_out; | |
1255 | } | |
1256 | brelse(new_bh); | |
1257 | ||
1258 | if (exfat_remove_entries(new_inode, p_dir, new_entry, 0, | |
1259 | num_entries + 1)) { | |
1260 | ret = -EIO; | |
1261 | goto del_out; | |
1262 | } | |
1263 | ||
1264 | /* Free the clusters if new_inode is a dir(as if exfat_rmdir) */ | |
1265 | if (new_entry_type == TYPE_DIR) { | |
1266 | /* new_ei, new_clu_to_free */ | |
1267 | struct exfat_chain new_clu_to_free; | |
1268 | ||
1269 | exfat_chain_set(&new_clu_to_free, new_ei->start_clu, | |
1270 | EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode), | |
1271 | sbi), new_ei->flags); | |
1272 | ||
1273 | if (exfat_free_cluster(new_inode, &new_clu_to_free)) { | |
1274 | /* just set I/O error only */ | |
1275 | ret = -EIO; | |
1276 | } | |
1277 | ||
1278 | i_size_write(new_inode, 0); | |
1279 | new_ei->start_clu = EXFAT_EOF_CLUSTER; | |
1280 | new_ei->flags = ALLOC_NO_FAT_CHAIN; | |
1281 | } | |
1282 | del_out: | |
1283 | /* Update new_inode ei | |
1284 | * Prevent syncing removed new_inode | |
1285 | * (new_ei is already initialized above code ("if (new_inode)") | |
1286 | */ | |
1287 | new_ei->dir.dir = DIR_DELETED; | |
1288 | } | |
5f2aa075 NJ |
1289 | out: |
1290 | return ret; | |
1291 | } | |
1292 | ||
549c7297 CB |
1293 | static int exfat_rename(struct user_namespace *mnt_userns, |
1294 | struct inode *old_dir, struct dentry *old_dentry, | |
1295 | struct inode *new_dir, struct dentry *new_dentry, | |
1296 | unsigned int flags) | |
5f2aa075 NJ |
1297 | { |
1298 | struct inode *old_inode, *new_inode; | |
1299 | struct super_block *sb = old_dir->i_sb; | |
1300 | loff_t i_pos; | |
1301 | int err; | |
1302 | ||
1303 | /* | |
1304 | * The VFS already checks for existence, so for local filesystems | |
1305 | * the RENAME_NOREPLACE implementation is equivalent to plain rename. | |
1306 | * Don't support any other flags | |
1307 | */ | |
1308 | if (flags & ~RENAME_NOREPLACE) | |
1309 | return -EINVAL; | |
1310 | ||
1311 | mutex_lock(&EXFAT_SB(sb)->s_lock); | |
1312 | old_inode = old_dentry->d_inode; | |
1313 | new_inode = new_dentry->d_inode; | |
1314 | ||
1315 | err = __exfat_rename(old_dir, EXFAT_I(old_inode), new_dir, new_dentry); | |
1316 | if (err) | |
1317 | goto unlock; | |
1318 | ||
1319 | inode_inc_iversion(new_dir); | |
1320 | new_dir->i_ctime = new_dir->i_mtime = new_dir->i_atime = | |
1321 | EXFAT_I(new_dir)->i_crtime = current_time(new_dir); | |
81df1ad4 | 1322 | exfat_truncate_atime(&new_dir->i_atime); |
5f2aa075 NJ |
1323 | if (IS_DIRSYNC(new_dir)) |
1324 | exfat_sync_inode(new_dir); | |
1325 | else | |
1326 | mark_inode_dirty(new_dir); | |
1327 | ||
1328 | i_pos = ((loff_t)EXFAT_I(old_inode)->dir.dir << 32) | | |
1329 | (EXFAT_I(old_inode)->entry & 0xffffffff); | |
1330 | exfat_unhash_inode(old_inode); | |
1331 | exfat_hash_inode(old_inode, i_pos); | |
1332 | if (IS_DIRSYNC(new_dir)) | |
1333 | exfat_sync_inode(old_inode); | |
1334 | else | |
1335 | mark_inode_dirty(old_inode); | |
1336 | ||
1337 | if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) { | |
1338 | drop_nlink(old_dir); | |
1339 | if (!new_inode) | |
1340 | inc_nlink(new_dir); | |
1341 | } | |
1342 | ||
1343 | inode_inc_iversion(old_dir); | |
1344 | old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir); | |
1345 | if (IS_DIRSYNC(old_dir)) | |
1346 | exfat_sync_inode(old_dir); | |
1347 | else | |
1348 | mark_inode_dirty(old_dir); | |
1349 | ||
1350 | if (new_inode) { | |
1351 | exfat_unhash_inode(new_inode); | |
1352 | ||
1353 | /* skip drop_nlink if new_inode already has been dropped */ | |
1354 | if (new_inode->i_nlink) { | |
1355 | drop_nlink(new_inode); | |
1356 | if (S_ISDIR(new_inode->i_mode)) | |
1357 | drop_nlink(new_inode); | |
1358 | } else { | |
d1727d55 | 1359 | exfat_warn(sb, "abnormal access to an inode dropped"); |
5f2aa075 NJ |
1360 | WARN_ON(new_inode->i_nlink == 0); |
1361 | } | |
1362 | new_inode->i_ctime = EXFAT_I(new_inode)->i_crtime = | |
1363 | current_time(new_inode); | |
1364 | } | |
1365 | ||
1366 | unlock: | |
1367 | mutex_unlock(&EXFAT_SB(sb)->s_lock); | |
1368 | return err; | |
1369 | } | |
1370 | ||
1371 | const struct inode_operations exfat_dir_inode_operations = { | |
1372 | .create = exfat_create, | |
1373 | .lookup = exfat_lookup, | |
1374 | .unlink = exfat_unlink, | |
1375 | .mkdir = exfat_mkdir, | |
1376 | .rmdir = exfat_rmdir, | |
1377 | .rename = exfat_rename, | |
1378 | .setattr = exfat_setattr, | |
1379 | .getattr = exfat_getattr, | |
1380 | }; |