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ca061973 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/slab.h> | |
7 | #include <linux/bio.h> | |
8 | #include <linux/buffer_head.h> | |
9 | ||
10 | #include "exfat_raw.h" | |
11 | #include "exfat_fs.h" | |
12 | ||
13 | static int exfat_extract_uni_name(struct exfat_dentry *ep, | |
14 | unsigned short *uniname) | |
15 | { | |
16 | int i, len = 0; | |
17 | ||
18 | for (i = 0; i < EXFAT_FILE_NAME_LEN; i++) { | |
19 | *uniname = le16_to_cpu(ep->dentry.name.unicode_0_14[i]); | |
20 | if (*uniname == 0x0) | |
21 | return len; | |
22 | uniname++; | |
23 | len++; | |
24 | } | |
25 | ||
26 | *uniname = 0x0; | |
27 | return len; | |
28 | ||
29 | } | |
30 | ||
31 | static void exfat_get_uniname_from_ext_entry(struct super_block *sb, | |
32 | struct exfat_chain *p_dir, int entry, unsigned short *uniname) | |
33 | { | |
34 | int i; | |
ca061973 NJ |
35 | struct exfat_entry_set_cache *es; |
36 | ||
943af1fd | 37 | es = exfat_get_dentry_set(sb, p_dir, entry, ES_ALL_ENTRIES); |
ca061973 NJ |
38 | if (!es) |
39 | return; | |
40 | ||
ca061973 NJ |
41 | /* |
42 | * First entry : file entry | |
43 | * Second entry : stream-extension entry | |
44 | * Third entry : first file-name entry | |
45 | * So, the index of first file-name dentry should start from 2. | |
46 | */ | |
943af1fd TK |
47 | for (i = 2; i < es->num_entries; i++) { |
48 | struct exfat_dentry *ep = exfat_get_dentry_cached(es, i); | |
49 | ||
ca061973 NJ |
50 | /* end of name entry */ |
51 | if (exfat_get_entry_type(ep) != TYPE_EXTEND) | |
943af1fd | 52 | break; |
ca061973 NJ |
53 | |
54 | exfat_extract_uni_name(ep, uniname); | |
55 | uniname += EXFAT_FILE_NAME_LEN; | |
56 | } | |
57 | ||
943af1fd | 58 | exfat_free_dentry_set(es, false); |
ca061973 NJ |
59 | } |
60 | ||
61 | /* read a directory entry from the opened directory */ | |
04cee52f | 62 | static int exfat_readdir(struct inode *inode, loff_t *cpos, struct exfat_dir_entry *dir_entry) |
ca061973 | 63 | { |
04cee52f | 64 | int i, dentries_per_clu, dentries_per_clu_bits = 0, num_ext; |
ca061973 NJ |
65 | unsigned int type, clu_offset; |
66 | sector_t sector; | |
67 | struct exfat_chain dir, clu; | |
68 | struct exfat_uni_name uni_name; | |
69 | struct exfat_dentry *ep; | |
70 | struct super_block *sb = inode->i_sb; | |
71 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
72 | struct exfat_inode_info *ei = EXFAT_I(inode); | |
04cee52f | 73 | unsigned int dentry = EXFAT_B_TO_DEN(*cpos) & 0xFFFFFFFF; |
ca061973 NJ |
74 | struct buffer_head *bh; |
75 | ||
76 | /* check if the given file ID is opened */ | |
77 | if (ei->type != TYPE_DIR) | |
78 | return -EPERM; | |
79 | ||
80 | if (ei->entry == -1) | |
81 | exfat_chain_set(&dir, sbi->root_dir, 0, ALLOC_FAT_CHAIN); | |
82 | else | |
83 | exfat_chain_set(&dir, ei->start_clu, | |
84 | EXFAT_B_TO_CLU(i_size_read(inode), sbi), ei->flags); | |
85 | ||
86 | dentries_per_clu = sbi->dentries_per_clu; | |
87 | dentries_per_clu_bits = ilog2(dentries_per_clu); | |
88 | ||
89 | clu_offset = dentry >> dentries_per_clu_bits; | |
90 | exfat_chain_dup(&clu, &dir); | |
91 | ||
92 | if (clu.flags == ALLOC_NO_FAT_CHAIN) { | |
93 | clu.dir += clu_offset; | |
94 | clu.size -= clu_offset; | |
95 | } else { | |
96 | /* hint_information */ | |
97 | if (clu_offset > 0 && ei->hint_bmap.off != EXFAT_EOF_CLUSTER && | |
98 | ei->hint_bmap.off > 0 && clu_offset >= ei->hint_bmap.off) { | |
99 | clu_offset -= ei->hint_bmap.off; | |
100 | clu.dir = ei->hint_bmap.clu; | |
101 | } | |
102 | ||
103 | while (clu_offset > 0) { | |
104 | if (exfat_get_next_cluster(sb, &(clu.dir))) | |
105 | return -EIO; | |
106 | ||
107 | clu_offset--; | |
108 | } | |
109 | } | |
110 | ||
111 | while (clu.dir != EXFAT_EOF_CLUSTER) { | |
112 | i = dentry & (dentries_per_clu - 1); | |
113 | ||
114 | for ( ; i < dentries_per_clu; i++, dentry++) { | |
115 | ep = exfat_get_dentry(sb, &clu, i, &bh, §or); | |
116 | if (!ep) | |
117 | return -EIO; | |
118 | ||
119 | type = exfat_get_entry_type(ep); | |
120 | if (type == TYPE_UNUSED) { | |
121 | brelse(bh); | |
122 | break; | |
123 | } | |
124 | ||
125 | if (type != TYPE_FILE && type != TYPE_DIR) { | |
126 | brelse(bh); | |
127 | continue; | |
128 | } | |
129 | ||
04cee52f | 130 | num_ext = ep->dentry.file.num_ext; |
ca061973 NJ |
131 | dir_entry->attr = le16_to_cpu(ep->dentry.file.attr); |
132 | exfat_get_entry_time(sbi, &dir_entry->crtime, | |
133 | ep->dentry.file.create_tz, | |
134 | ep->dentry.file.create_time, | |
135 | ep->dentry.file.create_date, | |
ed0f84d3 | 136 | ep->dentry.file.create_time_cs); |
ca061973 NJ |
137 | exfat_get_entry_time(sbi, &dir_entry->mtime, |
138 | ep->dentry.file.modify_tz, | |
139 | ep->dentry.file.modify_time, | |
140 | ep->dentry.file.modify_date, | |
ed0f84d3 | 141 | ep->dentry.file.modify_time_cs); |
ca061973 NJ |
142 | exfat_get_entry_time(sbi, &dir_entry->atime, |
143 | ep->dentry.file.access_tz, | |
144 | ep->dentry.file.access_time, | |
145 | ep->dentry.file.access_date, | |
146 | 0); | |
147 | ||
148 | *uni_name.name = 0x0; | |
149 | exfat_get_uniname_from_ext_entry(sb, &dir, dentry, | |
150 | uni_name.name); | |
151 | exfat_utf16_to_nls(sb, &uni_name, | |
152 | dir_entry->namebuf.lfn, | |
153 | dir_entry->namebuf.lfnbuf_len); | |
154 | brelse(bh); | |
155 | ||
156 | ep = exfat_get_dentry(sb, &clu, i + 1, &bh, NULL); | |
157 | if (!ep) | |
158 | return -EIO; | |
159 | dir_entry->size = | |
160 | le64_to_cpu(ep->dentry.stream.valid_size); | |
04cee52f | 161 | dir_entry->entry = dentry; |
ca061973 NJ |
162 | brelse(bh); |
163 | ||
164 | ei->hint_bmap.off = dentry >> dentries_per_clu_bits; | |
165 | ei->hint_bmap.clu = clu.dir; | |
166 | ||
04cee52f | 167 | *cpos = EXFAT_DEN_TO_B(dentry + 1 + num_ext); |
ca061973 NJ |
168 | return 0; |
169 | } | |
170 | ||
171 | if (clu.flags == ALLOC_NO_FAT_CHAIN) { | |
172 | if (--clu.size > 0) | |
173 | clu.dir++; | |
174 | else | |
175 | clu.dir = EXFAT_EOF_CLUSTER; | |
176 | } else { | |
177 | if (exfat_get_next_cluster(sb, &(clu.dir))) | |
178 | return -EIO; | |
179 | } | |
180 | } | |
181 | ||
182 | dir_entry->namebuf.lfn[0] = '\0'; | |
04cee52f | 183 | *cpos = EXFAT_DEN_TO_B(dentry); |
ca061973 NJ |
184 | return 0; |
185 | } | |
186 | ||
187 | static void exfat_init_namebuf(struct exfat_dentry_namebuf *nb) | |
188 | { | |
189 | nb->lfn = NULL; | |
190 | nb->lfnbuf_len = 0; | |
191 | } | |
192 | ||
193 | static int exfat_alloc_namebuf(struct exfat_dentry_namebuf *nb) | |
194 | { | |
195 | nb->lfn = __getname(); | |
196 | if (!nb->lfn) | |
197 | return -ENOMEM; | |
198 | nb->lfnbuf_len = MAX_VFSNAME_BUF_SIZE; | |
199 | return 0; | |
200 | } | |
201 | ||
202 | static void exfat_free_namebuf(struct exfat_dentry_namebuf *nb) | |
203 | { | |
204 | if (!nb->lfn) | |
205 | return; | |
206 | ||
207 | __putname(nb->lfn); | |
208 | exfat_init_namebuf(nb); | |
209 | } | |
210 | ||
211 | /* skip iterating emit_dots when dir is empty */ | |
212 | #define ITER_POS_FILLED_DOTS (2) | |
213 | static int exfat_iterate(struct file *filp, struct dir_context *ctx) | |
214 | { | |
215 | struct inode *inode = filp->f_path.dentry->d_inode; | |
216 | struct super_block *sb = inode->i_sb; | |
217 | struct inode *tmp; | |
218 | struct exfat_dir_entry de; | |
219 | struct exfat_dentry_namebuf *nb = &(de.namebuf); | |
220 | struct exfat_inode_info *ei = EXFAT_I(inode); | |
221 | unsigned long inum; | |
222 | loff_t cpos, i_pos; | |
223 | int err = 0, fake_offset = 0; | |
224 | ||
225 | exfat_init_namebuf(nb); | |
226 | mutex_lock(&EXFAT_SB(sb)->s_lock); | |
227 | ||
228 | cpos = ctx->pos; | |
229 | if (!dir_emit_dots(filp, ctx)) | |
230 | goto unlock; | |
231 | ||
232 | if (ctx->pos == ITER_POS_FILLED_DOTS) { | |
233 | cpos = 0; | |
234 | fake_offset = 1; | |
235 | } | |
236 | ||
237 | if (cpos & (DENTRY_SIZE - 1)) { | |
238 | err = -ENOENT; | |
239 | goto unlock; | |
240 | } | |
241 | ||
242 | /* name buffer should be allocated before use */ | |
243 | err = exfat_alloc_namebuf(nb); | |
244 | if (err) | |
245 | goto unlock; | |
246 | get_new: | |
ca061973 NJ |
247 | if (cpos >= i_size_read(inode)) |
248 | goto end_of_dir; | |
249 | ||
04cee52f | 250 | err = exfat_readdir(inode, &cpos, &de); |
ca061973 NJ |
251 | if (err) { |
252 | /* | |
253 | * At least we tried to read a sector. Move cpos to next sector | |
254 | * position (should be aligned). | |
255 | */ | |
256 | if (err == -EIO) { | |
257 | cpos += 1 << (sb->s_blocksize_bits); | |
258 | cpos &= ~(sb->s_blocksize - 1); | |
259 | } | |
260 | ||
261 | err = -EIO; | |
262 | goto end_of_dir; | |
263 | } | |
264 | ||
ca061973 NJ |
265 | if (!nb->lfn[0]) |
266 | goto end_of_dir; | |
267 | ||
04cee52f | 268 | i_pos = ((loff_t)ei->start_clu << 32) | (de.entry & 0xffffffff); |
ca061973 NJ |
269 | tmp = exfat_iget(sb, i_pos); |
270 | if (tmp) { | |
271 | inum = tmp->i_ino; | |
272 | iput(tmp); | |
273 | } else { | |
274 | inum = iunique(sb, EXFAT_ROOT_INO); | |
275 | } | |
276 | ||
277 | /* | |
278 | * Before calling dir_emit(), sb_lock should be released. | |
279 | * Because page fault can occur in dir_emit() when the size | |
280 | * of buffer given from user is larger than one page size. | |
281 | */ | |
282 | mutex_unlock(&EXFAT_SB(sb)->s_lock); | |
283 | if (!dir_emit(ctx, nb->lfn, strlen(nb->lfn), inum, | |
284 | (de.attr & ATTR_SUBDIR) ? DT_DIR : DT_REG)) | |
285 | goto out_unlocked; | |
286 | mutex_lock(&EXFAT_SB(sb)->s_lock); | |
287 | ctx->pos = cpos; | |
288 | goto get_new; | |
289 | ||
290 | end_of_dir: | |
291 | if (!cpos && fake_offset) | |
292 | cpos = ITER_POS_FILLED_DOTS; | |
293 | ctx->pos = cpos; | |
294 | unlock: | |
295 | mutex_unlock(&EXFAT_SB(sb)->s_lock); | |
296 | out_unlocked: | |
297 | /* | |
298 | * To improve performance, free namebuf after unlock sb_lock. | |
299 | * If namebuf is not allocated, this function do nothing | |
300 | */ | |
301 | exfat_free_namebuf(nb); | |
302 | return err; | |
303 | } | |
304 | ||
305 | const struct file_operations exfat_dir_operations = { | |
306 | .llseek = generic_file_llseek, | |
307 | .read = generic_read_dir, | |
308 | .iterate = exfat_iterate, | |
5267456e | 309 | .fsync = exfat_file_fsync, |
ca061973 NJ |
310 | }; |
311 | ||
312 | int exfat_alloc_new_dir(struct inode *inode, struct exfat_chain *clu) | |
313 | { | |
314 | int ret; | |
315 | ||
316 | exfat_chain_set(clu, EXFAT_EOF_CLUSTER, 0, ALLOC_NO_FAT_CHAIN); | |
317 | ||
318 | ret = exfat_alloc_cluster(inode, 1, clu); | |
319 | if (ret) | |
320 | return ret; | |
321 | ||
322 | return exfat_zeroed_cluster(inode, clu->dir); | |
323 | } | |
324 | ||
325 | int exfat_calc_num_entries(struct exfat_uni_name *p_uniname) | |
326 | { | |
327 | int len; | |
328 | ||
329 | len = p_uniname->name_len; | |
330 | if (len == 0) | |
331 | return -EINVAL; | |
332 | ||
333 | /* 1 file entry + 1 stream entry + name entries */ | |
334 | return ((len - 1) / EXFAT_FILE_NAME_LEN + 3); | |
335 | } | |
336 | ||
337 | unsigned int exfat_get_entry_type(struct exfat_dentry *ep) | |
338 | { | |
339 | if (ep->type == EXFAT_UNUSED) | |
340 | return TYPE_UNUSED; | |
341 | if (IS_EXFAT_DELETED(ep->type)) | |
342 | return TYPE_DELETED; | |
343 | if (ep->type == EXFAT_INVAL) | |
344 | return TYPE_INVALID; | |
345 | if (IS_EXFAT_CRITICAL_PRI(ep->type)) { | |
346 | if (ep->type == EXFAT_BITMAP) | |
347 | return TYPE_BITMAP; | |
348 | if (ep->type == EXFAT_UPCASE) | |
349 | return TYPE_UPCASE; | |
350 | if (ep->type == EXFAT_VOLUME) | |
351 | return TYPE_VOLUME; | |
352 | if (ep->type == EXFAT_FILE) { | |
353 | if (le16_to_cpu(ep->dentry.file.attr) & ATTR_SUBDIR) | |
354 | return TYPE_DIR; | |
355 | return TYPE_FILE; | |
356 | } | |
357 | return TYPE_CRITICAL_PRI; | |
358 | } | |
359 | if (IS_EXFAT_BENIGN_PRI(ep->type)) { | |
360 | if (ep->type == EXFAT_GUID) | |
361 | return TYPE_GUID; | |
362 | if (ep->type == EXFAT_PADDING) | |
363 | return TYPE_PADDING; | |
364 | if (ep->type == EXFAT_ACLTAB) | |
365 | return TYPE_ACLTAB; | |
366 | return TYPE_BENIGN_PRI; | |
367 | } | |
368 | if (IS_EXFAT_CRITICAL_SEC(ep->type)) { | |
369 | if (ep->type == EXFAT_STREAM) | |
370 | return TYPE_STREAM; | |
371 | if (ep->type == EXFAT_NAME) | |
372 | return TYPE_EXTEND; | |
373 | if (ep->type == EXFAT_ACL) | |
374 | return TYPE_ACL; | |
375 | return TYPE_CRITICAL_SEC; | |
376 | } | |
377 | return TYPE_BENIGN_SEC; | |
378 | } | |
379 | ||
380 | static void exfat_set_entry_type(struct exfat_dentry *ep, unsigned int type) | |
381 | { | |
382 | if (type == TYPE_UNUSED) { | |
383 | ep->type = EXFAT_UNUSED; | |
384 | } else if (type == TYPE_DELETED) { | |
385 | ep->type &= EXFAT_DELETE; | |
386 | } else if (type == TYPE_STREAM) { | |
387 | ep->type = EXFAT_STREAM; | |
388 | } else if (type == TYPE_EXTEND) { | |
389 | ep->type = EXFAT_NAME; | |
390 | } else if (type == TYPE_BITMAP) { | |
391 | ep->type = EXFAT_BITMAP; | |
392 | } else if (type == TYPE_UPCASE) { | |
393 | ep->type = EXFAT_UPCASE; | |
394 | } else if (type == TYPE_VOLUME) { | |
395 | ep->type = EXFAT_VOLUME; | |
396 | } else if (type == TYPE_DIR) { | |
397 | ep->type = EXFAT_FILE; | |
398 | ep->dentry.file.attr = cpu_to_le16(ATTR_SUBDIR); | |
399 | } else if (type == TYPE_FILE) { | |
400 | ep->type = EXFAT_FILE; | |
401 | ep->dentry.file.attr = cpu_to_le16(ATTR_ARCHIVE); | |
402 | } | |
403 | } | |
404 | ||
405 | static void exfat_init_stream_entry(struct exfat_dentry *ep, | |
406 | unsigned char flags, unsigned int start_clu, | |
407 | unsigned long long size) | |
408 | { | |
409 | exfat_set_entry_type(ep, TYPE_STREAM); | |
410 | ep->dentry.stream.flags = flags; | |
411 | ep->dentry.stream.start_clu = cpu_to_le32(start_clu); | |
412 | ep->dentry.stream.valid_size = cpu_to_le64(size); | |
413 | ep->dentry.stream.size = cpu_to_le64(size); | |
414 | } | |
415 | ||
416 | static void exfat_init_name_entry(struct exfat_dentry *ep, | |
417 | unsigned short *uniname) | |
418 | { | |
419 | int i; | |
420 | ||
421 | exfat_set_entry_type(ep, TYPE_EXTEND); | |
422 | ep->dentry.name.flags = 0x0; | |
423 | ||
424 | for (i = 0; i < EXFAT_FILE_NAME_LEN; i++) { | |
4ba6ccd6 HK |
425 | if (*uniname != 0x0) { |
426 | ep->dentry.name.unicode_0_14[i] = cpu_to_le16(*uniname); | |
427 | uniname++; | |
428 | } else { | |
429 | ep->dentry.name.unicode_0_14[i] = 0x0; | |
430 | } | |
ca061973 NJ |
431 | } |
432 | } | |
433 | ||
434 | int exfat_init_dir_entry(struct inode *inode, struct exfat_chain *p_dir, | |
435 | int entry, unsigned int type, unsigned int start_clu, | |
436 | unsigned long long size) | |
437 | { | |
438 | struct super_block *sb = inode->i_sb; | |
439 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
440 | struct timespec64 ts = current_time(inode); | |
441 | sector_t sector; | |
442 | struct exfat_dentry *ep; | |
443 | struct buffer_head *bh; | |
444 | ||
445 | /* | |
446 | * We cannot use exfat_get_dentry_set here because file ep is not | |
447 | * initialized yet. | |
448 | */ | |
449 | ep = exfat_get_dentry(sb, p_dir, entry, &bh, §or); | |
450 | if (!ep) | |
451 | return -EIO; | |
452 | ||
453 | exfat_set_entry_type(ep, type); | |
454 | exfat_set_entry_time(sbi, &ts, | |
455 | &ep->dentry.file.create_tz, | |
456 | &ep->dentry.file.create_time, | |
457 | &ep->dentry.file.create_date, | |
ed0f84d3 | 458 | &ep->dentry.file.create_time_cs); |
ca061973 NJ |
459 | exfat_set_entry_time(sbi, &ts, |
460 | &ep->dentry.file.modify_tz, | |
461 | &ep->dentry.file.modify_time, | |
462 | &ep->dentry.file.modify_date, | |
ed0f84d3 | 463 | &ep->dentry.file.modify_time_cs); |
ca061973 NJ |
464 | exfat_set_entry_time(sbi, &ts, |
465 | &ep->dentry.file.access_tz, | |
466 | &ep->dentry.file.access_time, | |
467 | &ep->dentry.file.access_date, | |
468 | NULL); | |
469 | ||
2c7f8937 | 470 | exfat_update_bh(bh, IS_DIRSYNC(inode)); |
ca061973 NJ |
471 | brelse(bh); |
472 | ||
473 | ep = exfat_get_dentry(sb, p_dir, entry + 1, &bh, §or); | |
474 | if (!ep) | |
475 | return -EIO; | |
476 | ||
477 | exfat_init_stream_entry(ep, | |
478 | (type == TYPE_FILE) ? ALLOC_FAT_CHAIN : ALLOC_NO_FAT_CHAIN, | |
479 | start_clu, size); | |
2c7f8937 | 480 | exfat_update_bh(bh, IS_DIRSYNC(inode)); |
ca061973 NJ |
481 | brelse(bh); |
482 | ||
483 | return 0; | |
484 | } | |
485 | ||
486 | int exfat_update_dir_chksum(struct inode *inode, struct exfat_chain *p_dir, | |
487 | int entry) | |
488 | { | |
489 | struct super_block *sb = inode->i_sb; | |
490 | int ret = 0; | |
491 | int i, num_entries; | |
492 | sector_t sector; | |
5875bf28 | 493 | u16 chksum; |
ca061973 NJ |
494 | struct exfat_dentry *ep, *fep; |
495 | struct buffer_head *fbh, *bh; | |
496 | ||
497 | fep = exfat_get_dentry(sb, p_dir, entry, &fbh, §or); | |
498 | if (!fep) | |
499 | return -EIO; | |
500 | ||
501 | num_entries = fep->dentry.file.num_ext + 1; | |
5875bf28 | 502 | chksum = exfat_calc_chksum16(fep, DENTRY_SIZE, 0, CS_DIR_ENTRY); |
ca061973 NJ |
503 | |
504 | for (i = 1; i < num_entries; i++) { | |
505 | ep = exfat_get_dentry(sb, p_dir, entry + i, &bh, NULL); | |
506 | if (!ep) { | |
507 | ret = -EIO; | |
508 | goto release_fbh; | |
509 | } | |
5875bf28 | 510 | chksum = exfat_calc_chksum16(ep, DENTRY_SIZE, chksum, |
ca061973 NJ |
511 | CS_DEFAULT); |
512 | brelse(bh); | |
513 | } | |
514 | ||
515 | fep->dentry.file.checksum = cpu_to_le16(chksum); | |
2c7f8937 | 516 | exfat_update_bh(fbh, IS_DIRSYNC(inode)); |
ca061973 NJ |
517 | release_fbh: |
518 | brelse(fbh); | |
519 | return ret; | |
520 | } | |
521 | ||
522 | int exfat_init_ext_entry(struct inode *inode, struct exfat_chain *p_dir, | |
523 | int entry, int num_entries, struct exfat_uni_name *p_uniname) | |
524 | { | |
525 | struct super_block *sb = inode->i_sb; | |
526 | int i; | |
527 | sector_t sector; | |
528 | unsigned short *uniname = p_uniname->name; | |
529 | struct exfat_dentry *ep; | |
530 | struct buffer_head *bh; | |
531 | int sync = IS_DIRSYNC(inode); | |
532 | ||
533 | ep = exfat_get_dentry(sb, p_dir, entry, &bh, §or); | |
534 | if (!ep) | |
535 | return -EIO; | |
536 | ||
537 | ep->dentry.file.num_ext = (unsigned char)(num_entries - 1); | |
2c7f8937 | 538 | exfat_update_bh(bh, sync); |
ca061973 NJ |
539 | brelse(bh); |
540 | ||
541 | ep = exfat_get_dentry(sb, p_dir, entry + 1, &bh, §or); | |
542 | if (!ep) | |
543 | return -EIO; | |
544 | ||
545 | ep->dentry.stream.name_len = p_uniname->name_len; | |
546 | ep->dentry.stream.name_hash = cpu_to_le16(p_uniname->name_hash); | |
2c7f8937 | 547 | exfat_update_bh(bh, sync); |
ca061973 NJ |
548 | brelse(bh); |
549 | ||
550 | for (i = EXFAT_FIRST_CLUSTER; i < num_entries; i++) { | |
551 | ep = exfat_get_dentry(sb, p_dir, entry + i, &bh, §or); | |
552 | if (!ep) | |
553 | return -EIO; | |
554 | ||
555 | exfat_init_name_entry(ep, uniname); | |
2c7f8937 | 556 | exfat_update_bh(bh, sync); |
ca061973 NJ |
557 | brelse(bh); |
558 | uniname += EXFAT_FILE_NAME_LEN; | |
559 | } | |
560 | ||
561 | exfat_update_dir_chksum(inode, p_dir, entry); | |
562 | return 0; | |
563 | } | |
564 | ||
565 | int exfat_remove_entries(struct inode *inode, struct exfat_chain *p_dir, | |
566 | int entry, int order, int num_entries) | |
567 | { | |
568 | struct super_block *sb = inode->i_sb; | |
569 | int i; | |
570 | sector_t sector; | |
571 | struct exfat_dentry *ep; | |
572 | struct buffer_head *bh; | |
573 | ||
574 | for (i = order; i < num_entries; i++) { | |
575 | ep = exfat_get_dentry(sb, p_dir, entry + i, &bh, §or); | |
576 | if (!ep) | |
577 | return -EIO; | |
578 | ||
579 | exfat_set_entry_type(ep, TYPE_DELETED); | |
2c7f8937 | 580 | exfat_update_bh(bh, IS_DIRSYNC(inode)); |
ca061973 NJ |
581 | brelse(bh); |
582 | } | |
583 | ||
584 | return 0; | |
585 | } | |
586 | ||
943af1fd | 587 | void exfat_update_dir_chksum_with_entry_set(struct exfat_entry_set_cache *es) |
ca061973 | 588 | { |
943af1fd | 589 | int chksum_type = CS_DIR_ENTRY, i; |
ca061973 | 590 | unsigned short chksum = 0; |
943af1fd | 591 | struct exfat_dentry *ep; |
ca061973 | 592 | |
943af1fd TK |
593 | for (i = 0; i < es->num_entries; i++) { |
594 | ep = exfat_get_dentry_cached(es, i); | |
5875bf28 TK |
595 | chksum = exfat_calc_chksum16(ep, DENTRY_SIZE, chksum, |
596 | chksum_type); | |
ca061973 NJ |
597 | chksum_type = CS_DEFAULT; |
598 | } | |
943af1fd TK |
599 | ep = exfat_get_dentry_cached(es, 0); |
600 | ep->dentry.file.checksum = cpu_to_le16(chksum); | |
601 | es->modified = true; | |
602 | } | |
ca061973 | 603 | |
8b0c4717 | 604 | int exfat_free_dentry_set(struct exfat_entry_set_cache *es, int sync) |
943af1fd | 605 | { |
3db3c3fb | 606 | int i, err = 0; |
ca061973 | 607 | |
3db3c3fb TK |
608 | if (es->modified) |
609 | err = exfat_update_bhs(es->bh, es->num_bh, sync); | |
610 | ||
611 | for (i = 0; i < es->num_bh; i++) | |
612 | if (err) | |
613 | bforget(es->bh[i]); | |
614 | else | |
615 | brelse(es->bh[i]); | |
943af1fd | 616 | kfree(es); |
8b0c4717 | 617 | return err; |
ca061973 NJ |
618 | } |
619 | ||
620 | static int exfat_walk_fat_chain(struct super_block *sb, | |
621 | struct exfat_chain *p_dir, unsigned int byte_offset, | |
622 | unsigned int *clu) | |
623 | { | |
624 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
625 | unsigned int clu_offset; | |
626 | unsigned int cur_clu; | |
627 | ||
628 | clu_offset = EXFAT_B_TO_CLU(byte_offset, sbi); | |
629 | cur_clu = p_dir->dir; | |
630 | ||
631 | if (p_dir->flags == ALLOC_NO_FAT_CHAIN) { | |
632 | cur_clu += clu_offset; | |
633 | } else { | |
634 | while (clu_offset > 0) { | |
635 | if (exfat_get_next_cluster(sb, &cur_clu)) | |
636 | return -EIO; | |
637 | if (cur_clu == EXFAT_EOF_CLUSTER) { | |
638 | exfat_fs_error(sb, | |
639 | "invalid dentry access beyond EOF (clu : %u, eidx : %d)", | |
640 | p_dir->dir, | |
641 | EXFAT_B_TO_DEN(byte_offset)); | |
642 | return -EIO; | |
643 | } | |
644 | clu_offset--; | |
645 | } | |
646 | } | |
647 | ||
648 | *clu = cur_clu; | |
649 | return 0; | |
650 | } | |
651 | ||
652 | int exfat_find_location(struct super_block *sb, struct exfat_chain *p_dir, | |
653 | int entry, sector_t *sector, int *offset) | |
654 | { | |
655 | int ret; | |
656 | unsigned int off, clu = 0; | |
657 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
658 | ||
659 | off = EXFAT_DEN_TO_B(entry); | |
660 | ||
661 | ret = exfat_walk_fat_chain(sb, p_dir, off, &clu); | |
662 | if (ret) | |
663 | return ret; | |
664 | ||
665 | /* byte offset in cluster */ | |
666 | off = EXFAT_CLU_OFFSET(off, sbi); | |
667 | ||
668 | /* byte offset in sector */ | |
669 | *offset = EXFAT_BLK_OFFSET(off, sb); | |
670 | ||
671 | /* sector offset in cluster */ | |
672 | *sector = EXFAT_B_TO_BLK(off, sb); | |
673 | *sector += exfat_cluster_to_sector(sbi, clu); | |
674 | return 0; | |
675 | } | |
676 | ||
677 | #define EXFAT_MAX_RA_SIZE (128*1024) | |
678 | static int exfat_dir_readahead(struct super_block *sb, sector_t sec) | |
679 | { | |
680 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
681 | struct buffer_head *bh; | |
682 | unsigned int max_ra_count = EXFAT_MAX_RA_SIZE >> sb->s_blocksize_bits; | |
683 | unsigned int page_ra_count = PAGE_SIZE >> sb->s_blocksize_bits; | |
684 | unsigned int adj_ra_count = max(sbi->sect_per_clus, page_ra_count); | |
685 | unsigned int ra_count = min(adj_ra_count, max_ra_count); | |
686 | ||
687 | /* Read-ahead is not required */ | |
688 | if (sbi->sect_per_clus == 1) | |
689 | return 0; | |
690 | ||
691 | if (sec < sbi->data_start_sector) { | |
d1727d55 JP |
692 | exfat_err(sb, "requested sector is invalid(sect:%llu, root:%llu)", |
693 | (unsigned long long)sec, sbi->data_start_sector); | |
ca061973 NJ |
694 | return -EIO; |
695 | } | |
696 | ||
697 | /* Not sector aligned with ra_count, resize ra_count to page size */ | |
698 | if ((sec - sbi->data_start_sector) & (ra_count - 1)) | |
699 | ra_count = page_ra_count; | |
700 | ||
701 | bh = sb_find_get_block(sb, sec); | |
702 | if (!bh || !buffer_uptodate(bh)) { | |
703 | unsigned int i; | |
704 | ||
705 | for (i = 0; i < ra_count; i++) | |
706 | sb_breadahead(sb, (sector_t)(sec + i)); | |
707 | } | |
708 | brelse(bh); | |
709 | return 0; | |
710 | } | |
711 | ||
712 | struct exfat_dentry *exfat_get_dentry(struct super_block *sb, | |
713 | struct exfat_chain *p_dir, int entry, struct buffer_head **bh, | |
714 | sector_t *sector) | |
715 | { | |
716 | unsigned int dentries_per_page = EXFAT_B_TO_DEN(PAGE_SIZE); | |
717 | int off; | |
718 | sector_t sec; | |
719 | ||
720 | if (p_dir->dir == DIR_DELETED) { | |
d1727d55 | 721 | exfat_err(sb, "abnormal access to deleted dentry"); |
ca061973 NJ |
722 | return NULL; |
723 | } | |
724 | ||
725 | if (exfat_find_location(sb, p_dir, entry, &sec, &off)) | |
726 | return NULL; | |
727 | ||
728 | if (p_dir->dir != EXFAT_FREE_CLUSTER && | |
729 | !(entry & (dentries_per_page - 1))) | |
730 | exfat_dir_readahead(sb, sec); | |
731 | ||
732 | *bh = sb_bread(sb, sec); | |
733 | if (!*bh) | |
734 | return NULL; | |
735 | ||
736 | if (sector) | |
737 | *sector = sec; | |
738 | return (struct exfat_dentry *)((*bh)->b_data + off); | |
739 | } | |
740 | ||
741 | enum exfat_validate_dentry_mode { | |
742 | ES_MODE_STARTED, | |
743 | ES_MODE_GET_FILE_ENTRY, | |
744 | ES_MODE_GET_STRM_ENTRY, | |
745 | ES_MODE_GET_NAME_ENTRY, | |
746 | ES_MODE_GET_CRITICAL_SEC_ENTRY, | |
747 | }; | |
748 | ||
749 | static bool exfat_validate_entry(unsigned int type, | |
750 | enum exfat_validate_dentry_mode *mode) | |
751 | { | |
752 | if (type == TYPE_UNUSED || type == TYPE_DELETED) | |
753 | return false; | |
754 | ||
755 | switch (*mode) { | |
756 | case ES_MODE_STARTED: | |
757 | if (type != TYPE_FILE && type != TYPE_DIR) | |
758 | return false; | |
759 | *mode = ES_MODE_GET_FILE_ENTRY; | |
760 | return true; | |
761 | case ES_MODE_GET_FILE_ENTRY: | |
762 | if (type != TYPE_STREAM) | |
763 | return false; | |
764 | *mode = ES_MODE_GET_STRM_ENTRY; | |
765 | return true; | |
766 | case ES_MODE_GET_STRM_ENTRY: | |
767 | if (type != TYPE_EXTEND) | |
768 | return false; | |
769 | *mode = ES_MODE_GET_NAME_ENTRY; | |
770 | return true; | |
771 | case ES_MODE_GET_NAME_ENTRY: | |
772 | if (type == TYPE_STREAM) | |
773 | return false; | |
774 | if (type != TYPE_EXTEND) { | |
775 | if (!(type & TYPE_CRITICAL_SEC)) | |
776 | return false; | |
777 | *mode = ES_MODE_GET_CRITICAL_SEC_ENTRY; | |
778 | } | |
779 | return true; | |
780 | case ES_MODE_GET_CRITICAL_SEC_ENTRY: | |
781 | if (type == TYPE_EXTEND || type == TYPE_STREAM) | |
782 | return false; | |
783 | if ((type & TYPE_CRITICAL_SEC) != TYPE_CRITICAL_SEC) | |
784 | return false; | |
785 | return true; | |
786 | default: | |
787 | WARN_ON_ONCE(1); | |
788 | return false; | |
789 | } | |
790 | } | |
791 | ||
943af1fd TK |
792 | struct exfat_dentry *exfat_get_dentry_cached( |
793 | struct exfat_entry_set_cache *es, int num) | |
794 | { | |
795 | int off = es->start_off + num * DENTRY_SIZE; | |
796 | struct buffer_head *bh = es->bh[EXFAT_B_TO_BLK(off, es->sb)]; | |
797 | char *p = bh->b_data + EXFAT_BLK_OFFSET(off, es->sb); | |
798 | ||
799 | return (struct exfat_dentry *)p; | |
800 | } | |
801 | ||
ca061973 NJ |
802 | /* |
803 | * Returns a set of dentries for a file or dir. | |
804 | * | |
943af1fd TK |
805 | * Note It provides a direct pointer to bh->data via exfat_get_dentry_cached(). |
806 | * User should call exfat_get_dentry_set() after setting 'modified' to apply | |
807 | * changes made in this entry set to the real device. | |
ca061973 NJ |
808 | * |
809 | * in: | |
810 | * sb+p_dir+entry: indicates a file/dir | |
811 | * type: specifies how many dentries should be included. | |
ca061973 NJ |
812 | * return: |
813 | * pointer of entry set on success, | |
814 | * NULL on failure. | |
815 | */ | |
816 | struct exfat_entry_set_cache *exfat_get_dentry_set(struct super_block *sb, | |
943af1fd | 817 | struct exfat_chain *p_dir, int entry, unsigned int type) |
ca061973 | 818 | { |
943af1fd | 819 | int ret, i, num_bh; |
ca061973 | 820 | unsigned int off, byte_offset, clu = 0; |
ca061973 NJ |
821 | sector_t sec; |
822 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
823 | struct exfat_entry_set_cache *es; | |
943af1fd TK |
824 | struct exfat_dentry *ep; |
825 | int num_entries; | |
ca061973 NJ |
826 | enum exfat_validate_dentry_mode mode = ES_MODE_STARTED; |
827 | struct buffer_head *bh; | |
828 | ||
829 | if (p_dir->dir == DIR_DELETED) { | |
d1727d55 | 830 | exfat_err(sb, "access to deleted dentry"); |
ca061973 NJ |
831 | return NULL; |
832 | } | |
833 | ||
834 | byte_offset = EXFAT_DEN_TO_B(entry); | |
835 | ret = exfat_walk_fat_chain(sb, p_dir, byte_offset, &clu); | |
836 | if (ret) | |
837 | return NULL; | |
838 | ||
943af1fd TK |
839 | es = kzalloc(sizeof(*es), GFP_KERNEL); |
840 | if (!es) | |
841 | return NULL; | |
842 | es->sb = sb; | |
843 | es->modified = false; | |
844 | ||
ca061973 NJ |
845 | /* byte offset in cluster */ |
846 | byte_offset = EXFAT_CLU_OFFSET(byte_offset, sbi); | |
847 | ||
848 | /* byte offset in sector */ | |
849 | off = EXFAT_BLK_OFFSET(byte_offset, sb); | |
943af1fd | 850 | es->start_off = off; |
ca061973 NJ |
851 | |
852 | /* sector offset in cluster */ | |
853 | sec = EXFAT_B_TO_BLK(byte_offset, sb); | |
854 | sec += exfat_cluster_to_sector(sbi, clu); | |
855 | ||
856 | bh = sb_bread(sb, sec); | |
857 | if (!bh) | |
943af1fd TK |
858 | goto free_es; |
859 | es->bh[es->num_bh++] = bh; | |
ca061973 | 860 | |
943af1fd TK |
861 | ep = exfat_get_dentry_cached(es, 0); |
862 | if (!exfat_validate_entry(exfat_get_entry_type(ep), &mode)) | |
863 | goto free_es; | |
ca061973 NJ |
864 | |
865 | num_entries = type == ES_ALL_ENTRIES ? | |
866 | ep->dentry.file.num_ext + 1 : type; | |
ca061973 | 867 | es->num_entries = num_entries; |
ca061973 | 868 | |
943af1fd TK |
869 | num_bh = EXFAT_B_TO_BLK_ROUND_UP(off + num_entries * DENTRY_SIZE, sb); |
870 | for (i = 1; i < num_bh; i++) { | |
871 | /* get the next sector */ | |
872 | if (exfat_is_last_sector_in_cluster(sbi, sec)) { | |
873 | if (p_dir->flags == ALLOC_NO_FAT_CHAIN) | |
874 | clu++; | |
875 | else if (exfat_get_next_cluster(sb, &clu)) | |
ca061973 | 876 | goto free_es; |
943af1fd | 877 | sec = exfat_cluster_to_sector(sbi, clu); |
ca061973 | 878 | } else { |
943af1fd | 879 | sec++; |
ca061973 | 880 | } |
943af1fd TK |
881 | |
882 | bh = sb_bread(sb, sec); | |
883 | if (!bh) | |
884 | goto free_es; | |
885 | es->bh[es->num_bh++] = bh; | |
ca061973 NJ |
886 | } |
887 | ||
943af1fd TK |
888 | /* validiate cached dentries */ |
889 | for (i = 1; i < num_entries; i++) { | |
890 | ep = exfat_get_dentry_cached(es, i); | |
891 | if (!exfat_validate_entry(exfat_get_entry_type(ep), &mode)) | |
892 | goto free_es; | |
893 | } | |
ca061973 NJ |
894 | return es; |
895 | ||
896 | free_es: | |
943af1fd | 897 | exfat_free_dentry_set(es, false); |
ca061973 NJ |
898 | return NULL; |
899 | } | |
900 | ||
901 | enum { | |
902 | DIRENT_STEP_FILE, | |
903 | DIRENT_STEP_STRM, | |
904 | DIRENT_STEP_NAME, | |
905 | DIRENT_STEP_SECD, | |
906 | }; | |
907 | ||
908 | /* | |
909 | * return values: | |
910 | * >= 0 : return dir entiry position with the name in dir | |
ca061973 NJ |
911 | * -ENOENT : entry with the name does not exist |
912 | * -EIO : I/O error | |
913 | */ | |
914 | int exfat_find_dir_entry(struct super_block *sb, struct exfat_inode_info *ei, | |
915 | struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname, | |
916 | int num_entries, unsigned int type) | |
917 | { | |
918 | int i, rewind = 0, dentry = 0, end_eidx = 0, num_ext = 0, len; | |
919 | int order, step, name_len = 0; | |
920 | int dentries_per_clu, num_empty = 0; | |
921 | unsigned int entry_type; | |
922 | unsigned short *uniname = NULL; | |
923 | struct exfat_chain clu; | |
924 | struct exfat_hint *hint_stat = &ei->hint_stat; | |
925 | struct exfat_hint_femp candi_empty; | |
926 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
927 | ||
928 | dentries_per_clu = sbi->dentries_per_clu; | |
929 | ||
930 | exfat_chain_dup(&clu, p_dir); | |
931 | ||
932 | if (hint_stat->eidx) { | |
933 | clu.dir = hint_stat->clu; | |
934 | dentry = hint_stat->eidx; | |
935 | end_eidx = dentry; | |
936 | } | |
937 | ||
938 | candi_empty.eidx = EXFAT_HINT_NONE; | |
939 | rewind: | |
940 | order = 0; | |
941 | step = DIRENT_STEP_FILE; | |
942 | while (clu.dir != EXFAT_EOF_CLUSTER) { | |
943 | i = dentry & (dentries_per_clu - 1); | |
944 | for (; i < dentries_per_clu; i++, dentry++) { | |
945 | struct exfat_dentry *ep; | |
946 | struct buffer_head *bh; | |
947 | ||
948 | if (rewind && dentry == end_eidx) | |
949 | goto not_found; | |
950 | ||
951 | ep = exfat_get_dentry(sb, &clu, i, &bh, NULL); | |
952 | if (!ep) | |
953 | return -EIO; | |
954 | ||
955 | entry_type = exfat_get_entry_type(ep); | |
956 | ||
957 | if (entry_type == TYPE_UNUSED || | |
958 | entry_type == TYPE_DELETED) { | |
959 | step = DIRENT_STEP_FILE; | |
960 | ||
961 | num_empty++; | |
962 | if (candi_empty.eidx == EXFAT_HINT_NONE && | |
963 | num_empty == 1) { | |
964 | exfat_chain_set(&candi_empty.cur, | |
965 | clu.dir, clu.size, clu.flags); | |
966 | } | |
967 | ||
968 | if (candi_empty.eidx == EXFAT_HINT_NONE && | |
969 | num_empty >= num_entries) { | |
970 | candi_empty.eidx = | |
971 | dentry - (num_empty - 1); | |
972 | WARN_ON(candi_empty.eidx < 0); | |
973 | candi_empty.count = num_empty; | |
974 | ||
975 | if (ei->hint_femp.eidx == | |
976 | EXFAT_HINT_NONE || | |
977 | candi_empty.eidx <= | |
a7a24168 TK |
978 | ei->hint_femp.eidx) |
979 | ei->hint_femp = candi_empty; | |
ca061973 NJ |
980 | } |
981 | ||
982 | brelse(bh); | |
983 | if (entry_type == TYPE_UNUSED) | |
984 | goto not_found; | |
985 | continue; | |
986 | } | |
987 | ||
988 | num_empty = 0; | |
989 | candi_empty.eidx = EXFAT_HINT_NONE; | |
990 | ||
991 | if (entry_type == TYPE_FILE || entry_type == TYPE_DIR) { | |
992 | step = DIRENT_STEP_FILE; | |
993 | if (type == TYPE_ALL || type == entry_type) { | |
994 | num_ext = ep->dentry.file.num_ext; | |
995 | step = DIRENT_STEP_STRM; | |
996 | } | |
997 | brelse(bh); | |
998 | continue; | |
999 | } | |
1000 | ||
1001 | if (entry_type == TYPE_STREAM) { | |
5875bf28 | 1002 | u16 name_hash; |
ca061973 NJ |
1003 | |
1004 | if (step != DIRENT_STEP_STRM) { | |
1005 | step = DIRENT_STEP_FILE; | |
1006 | brelse(bh); | |
1007 | continue; | |
1008 | } | |
1009 | step = DIRENT_STEP_FILE; | |
1010 | name_hash = le16_to_cpu( | |
1011 | ep->dentry.stream.name_hash); | |
1012 | if (p_uniname->name_hash == name_hash && | |
1013 | p_uniname->name_len == | |
1014 | ep->dentry.stream.name_len) { | |
1015 | step = DIRENT_STEP_NAME; | |
1016 | order = 1; | |
1017 | name_len = 0; | |
1018 | } | |
1019 | brelse(bh); | |
1020 | continue; | |
1021 | } | |
1022 | ||
1023 | brelse(bh); | |
1024 | if (entry_type == TYPE_EXTEND) { | |
1025 | unsigned short entry_uniname[16], unichar; | |
1026 | ||
1027 | if (step != DIRENT_STEP_NAME) { | |
1028 | step = DIRENT_STEP_FILE; | |
1029 | continue; | |
1030 | } | |
1031 | ||
1032 | if (++order == 2) | |
1033 | uniname = p_uniname->name; | |
1034 | else | |
1035 | uniname += EXFAT_FILE_NAME_LEN; | |
1036 | ||
1037 | len = exfat_extract_uni_name(ep, entry_uniname); | |
1038 | name_len += len; | |
1039 | ||
1040 | unichar = *(uniname+len); | |
1041 | *(uniname+len) = 0x0; | |
1042 | ||
1043 | if (exfat_uniname_ncmp(sb, uniname, | |
1044 | entry_uniname, len)) { | |
1045 | step = DIRENT_STEP_FILE; | |
1046 | } else if (p_uniname->name_len == name_len) { | |
1047 | if (order == num_ext) | |
1048 | goto found; | |
1049 | step = DIRENT_STEP_SECD; | |
1050 | } | |
1051 | ||
1052 | *(uniname+len) = unichar; | |
1053 | continue; | |
1054 | } | |
1055 | ||
1056 | if (entry_type & | |
1057 | (TYPE_CRITICAL_SEC | TYPE_BENIGN_SEC)) { | |
1058 | if (step == DIRENT_STEP_SECD) { | |
1059 | if (++order == num_ext) | |
1060 | goto found; | |
1061 | continue; | |
1062 | } | |
1063 | } | |
1064 | step = DIRENT_STEP_FILE; | |
1065 | } | |
1066 | ||
1067 | if (clu.flags == ALLOC_NO_FAT_CHAIN) { | |
1068 | if (--clu.size > 0) | |
1069 | clu.dir++; | |
1070 | else | |
1071 | clu.dir = EXFAT_EOF_CLUSTER; | |
1072 | } else { | |
1073 | if (exfat_get_next_cluster(sb, &clu.dir)) | |
1074 | return -EIO; | |
1075 | } | |
1076 | } | |
1077 | ||
1078 | not_found: | |
1079 | /* | |
1080 | * We started at not 0 index,so we should try to find target | |
1081 | * from 0 index to the index we started at. | |
1082 | */ | |
1083 | if (!rewind && end_eidx) { | |
1084 | rewind = 1; | |
1085 | dentry = 0; | |
1086 | clu.dir = p_dir->dir; | |
1087 | /* reset empty hint */ | |
1088 | num_empty = 0; | |
1089 | candi_empty.eidx = EXFAT_HINT_NONE; | |
1090 | goto rewind; | |
1091 | } | |
1092 | ||
1093 | /* initialized hint_stat */ | |
1094 | hint_stat->clu = p_dir->dir; | |
1095 | hint_stat->eidx = 0; | |
1096 | return -ENOENT; | |
1097 | ||
1098 | found: | |
1099 | /* next dentry we'll find is out of this cluster */ | |
1100 | if (!((dentry + 1) & (dentries_per_clu - 1))) { | |
1101 | int ret = 0; | |
1102 | ||
1103 | if (clu.flags == ALLOC_NO_FAT_CHAIN) { | |
1104 | if (--clu.size > 0) | |
1105 | clu.dir++; | |
1106 | else | |
1107 | clu.dir = EXFAT_EOF_CLUSTER; | |
1108 | } else { | |
1109 | ret = exfat_get_next_cluster(sb, &clu.dir); | |
1110 | } | |
1111 | ||
d2fa0c33 | 1112 | if (ret || clu.dir == EXFAT_EOF_CLUSTER) { |
ca061973 NJ |
1113 | /* just initialized hint_stat */ |
1114 | hint_stat->clu = p_dir->dir; | |
1115 | hint_stat->eidx = 0; | |
1116 | return (dentry - num_ext); | |
1117 | } | |
1118 | } | |
1119 | ||
1120 | hint_stat->clu = clu.dir; | |
1121 | hint_stat->eidx = dentry + 1; | |
1122 | return dentry - num_ext; | |
1123 | } | |
1124 | ||
1125 | int exfat_count_ext_entries(struct super_block *sb, struct exfat_chain *p_dir, | |
1126 | int entry, struct exfat_dentry *ep) | |
1127 | { | |
1128 | int i, count = 0; | |
1129 | unsigned int type; | |
1130 | struct exfat_dentry *ext_ep; | |
1131 | struct buffer_head *bh; | |
1132 | ||
1133 | for (i = 0, entry++; i < ep->dentry.file.num_ext; i++, entry++) { | |
1134 | ext_ep = exfat_get_dentry(sb, p_dir, entry, &bh, NULL); | |
1135 | if (!ext_ep) | |
1136 | return -EIO; | |
1137 | ||
1138 | type = exfat_get_entry_type(ext_ep); | |
1139 | brelse(bh); | |
1140 | if (type == TYPE_EXTEND || type == TYPE_STREAM) | |
1141 | count++; | |
1142 | else | |
1143 | break; | |
1144 | } | |
1145 | return count; | |
1146 | } | |
1147 | ||
1148 | int exfat_count_dir_entries(struct super_block *sb, struct exfat_chain *p_dir) | |
1149 | { | |
1150 | int i, count = 0; | |
1151 | int dentries_per_clu; | |
1152 | unsigned int entry_type; | |
1153 | struct exfat_chain clu; | |
1154 | struct exfat_dentry *ep; | |
1155 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
1156 | struct buffer_head *bh; | |
1157 | ||
1158 | dentries_per_clu = sbi->dentries_per_clu; | |
1159 | ||
1160 | exfat_chain_dup(&clu, p_dir); | |
1161 | ||
1162 | while (clu.dir != EXFAT_EOF_CLUSTER) { | |
1163 | for (i = 0; i < dentries_per_clu; i++) { | |
1164 | ep = exfat_get_dentry(sb, &clu, i, &bh, NULL); | |
1165 | if (!ep) | |
1166 | return -EIO; | |
1167 | entry_type = exfat_get_entry_type(ep); | |
1168 | brelse(bh); | |
1169 | ||
1170 | if (entry_type == TYPE_UNUSED) | |
1171 | return count; | |
1172 | if (entry_type != TYPE_DIR) | |
1173 | continue; | |
1174 | count++; | |
1175 | } | |
1176 | ||
1177 | if (clu.flags == ALLOC_NO_FAT_CHAIN) { | |
1178 | if (--clu.size > 0) | |
1179 | clu.dir++; | |
1180 | else | |
1181 | clu.dir = EXFAT_EOF_CLUSTER; | |
1182 | } else { | |
1183 | if (exfat_get_next_cluster(sb, &(clu.dir))) | |
1184 | return -EIO; | |
1185 | } | |
1186 | } | |
1187 | ||
1188 | return count; | |
1189 | } |