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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; | |
35 | struct exfat_dentry *ep; | |
36 | struct exfat_entry_set_cache *es; | |
37 | ||
38 | es = exfat_get_dentry_set(sb, p_dir, entry, ES_ALL_ENTRIES, &ep); | |
39 | if (!es) | |
40 | return; | |
41 | ||
42 | if (es->num_entries < 3) | |
43 | goto free_es; | |
44 | ||
45 | ep += 2; | |
46 | ||
47 | /* | |
48 | * First entry : file entry | |
49 | * Second entry : stream-extension entry | |
50 | * Third entry : first file-name entry | |
51 | * So, the index of first file-name dentry should start from 2. | |
52 | */ | |
53 | for (i = 2; i < es->num_entries; i++, ep++) { | |
54 | /* end of name entry */ | |
55 | if (exfat_get_entry_type(ep) != TYPE_EXTEND) | |
56 | goto free_es; | |
57 | ||
58 | exfat_extract_uni_name(ep, uniname); | |
59 | uniname += EXFAT_FILE_NAME_LEN; | |
60 | } | |
61 | ||
62 | free_es: | |
63 | kfree(es); | |
64 | } | |
65 | ||
66 | /* read a directory entry from the opened directory */ | |
67 | static int exfat_readdir(struct inode *inode, struct exfat_dir_entry *dir_entry) | |
68 | { | |
69 | int i, dentries_per_clu, dentries_per_clu_bits = 0; | |
70 | unsigned int type, clu_offset; | |
71 | sector_t sector; | |
72 | struct exfat_chain dir, clu; | |
73 | struct exfat_uni_name uni_name; | |
74 | struct exfat_dentry *ep; | |
75 | struct super_block *sb = inode->i_sb; | |
76 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
77 | struct exfat_inode_info *ei = EXFAT_I(inode); | |
78 | unsigned int dentry = ei->rwoffset & 0xFFFFFFFF; | |
79 | struct buffer_head *bh; | |
80 | ||
81 | /* check if the given file ID is opened */ | |
82 | if (ei->type != TYPE_DIR) | |
83 | return -EPERM; | |
84 | ||
85 | if (ei->entry == -1) | |
86 | exfat_chain_set(&dir, sbi->root_dir, 0, ALLOC_FAT_CHAIN); | |
87 | else | |
88 | exfat_chain_set(&dir, ei->start_clu, | |
89 | EXFAT_B_TO_CLU(i_size_read(inode), sbi), ei->flags); | |
90 | ||
91 | dentries_per_clu = sbi->dentries_per_clu; | |
92 | dentries_per_clu_bits = ilog2(dentries_per_clu); | |
93 | ||
94 | clu_offset = dentry >> dentries_per_clu_bits; | |
95 | exfat_chain_dup(&clu, &dir); | |
96 | ||
97 | if (clu.flags == ALLOC_NO_FAT_CHAIN) { | |
98 | clu.dir += clu_offset; | |
99 | clu.size -= clu_offset; | |
100 | } else { | |
101 | /* hint_information */ | |
102 | if (clu_offset > 0 && ei->hint_bmap.off != EXFAT_EOF_CLUSTER && | |
103 | ei->hint_bmap.off > 0 && clu_offset >= ei->hint_bmap.off) { | |
104 | clu_offset -= ei->hint_bmap.off; | |
105 | clu.dir = ei->hint_bmap.clu; | |
106 | } | |
107 | ||
108 | while (clu_offset > 0) { | |
109 | if (exfat_get_next_cluster(sb, &(clu.dir))) | |
110 | return -EIO; | |
111 | ||
112 | clu_offset--; | |
113 | } | |
114 | } | |
115 | ||
116 | while (clu.dir != EXFAT_EOF_CLUSTER) { | |
117 | i = dentry & (dentries_per_clu - 1); | |
118 | ||
119 | for ( ; i < dentries_per_clu; i++, dentry++) { | |
120 | ep = exfat_get_dentry(sb, &clu, i, &bh, §or); | |
121 | if (!ep) | |
122 | return -EIO; | |
123 | ||
124 | type = exfat_get_entry_type(ep); | |
125 | if (type == TYPE_UNUSED) { | |
126 | brelse(bh); | |
127 | break; | |
128 | } | |
129 | ||
130 | if (type != TYPE_FILE && type != TYPE_DIR) { | |
131 | brelse(bh); | |
132 | continue; | |
133 | } | |
134 | ||
135 | dir_entry->attr = le16_to_cpu(ep->dentry.file.attr); | |
136 | exfat_get_entry_time(sbi, &dir_entry->crtime, | |
137 | ep->dentry.file.create_tz, | |
138 | ep->dentry.file.create_time, | |
139 | ep->dentry.file.create_date, | |
ed0f84d3 | 140 | ep->dentry.file.create_time_cs); |
ca061973 NJ |
141 | exfat_get_entry_time(sbi, &dir_entry->mtime, |
142 | ep->dentry.file.modify_tz, | |
143 | ep->dentry.file.modify_time, | |
144 | ep->dentry.file.modify_date, | |
ed0f84d3 | 145 | ep->dentry.file.modify_time_cs); |
ca061973 NJ |
146 | exfat_get_entry_time(sbi, &dir_entry->atime, |
147 | ep->dentry.file.access_tz, | |
148 | ep->dentry.file.access_time, | |
149 | ep->dentry.file.access_date, | |
150 | 0); | |
151 | ||
152 | *uni_name.name = 0x0; | |
153 | exfat_get_uniname_from_ext_entry(sb, &dir, dentry, | |
154 | uni_name.name); | |
155 | exfat_utf16_to_nls(sb, &uni_name, | |
156 | dir_entry->namebuf.lfn, | |
157 | dir_entry->namebuf.lfnbuf_len); | |
158 | brelse(bh); | |
159 | ||
160 | ep = exfat_get_dentry(sb, &clu, i + 1, &bh, NULL); | |
161 | if (!ep) | |
162 | return -EIO; | |
163 | dir_entry->size = | |
164 | le64_to_cpu(ep->dentry.stream.valid_size); | |
165 | brelse(bh); | |
166 | ||
167 | ei->hint_bmap.off = dentry >> dentries_per_clu_bits; | |
168 | ei->hint_bmap.clu = clu.dir; | |
169 | ||
170 | ei->rwoffset = ++dentry; | |
171 | return 0; | |
172 | } | |
173 | ||
174 | if (clu.flags == ALLOC_NO_FAT_CHAIN) { | |
175 | if (--clu.size > 0) | |
176 | clu.dir++; | |
177 | else | |
178 | clu.dir = EXFAT_EOF_CLUSTER; | |
179 | } else { | |
180 | if (exfat_get_next_cluster(sb, &(clu.dir))) | |
181 | return -EIO; | |
182 | } | |
183 | } | |
184 | ||
185 | dir_entry->namebuf.lfn[0] = '\0'; | |
186 | ei->rwoffset = dentry; | |
187 | return 0; | |
188 | } | |
189 | ||
190 | static void exfat_init_namebuf(struct exfat_dentry_namebuf *nb) | |
191 | { | |
192 | nb->lfn = NULL; | |
193 | nb->lfnbuf_len = 0; | |
194 | } | |
195 | ||
196 | static int exfat_alloc_namebuf(struct exfat_dentry_namebuf *nb) | |
197 | { | |
198 | nb->lfn = __getname(); | |
199 | if (!nb->lfn) | |
200 | return -ENOMEM; | |
201 | nb->lfnbuf_len = MAX_VFSNAME_BUF_SIZE; | |
202 | return 0; | |
203 | } | |
204 | ||
205 | static void exfat_free_namebuf(struct exfat_dentry_namebuf *nb) | |
206 | { | |
207 | if (!nb->lfn) | |
208 | return; | |
209 | ||
210 | __putname(nb->lfn); | |
211 | exfat_init_namebuf(nb); | |
212 | } | |
213 | ||
214 | /* skip iterating emit_dots when dir is empty */ | |
215 | #define ITER_POS_FILLED_DOTS (2) | |
216 | static int exfat_iterate(struct file *filp, struct dir_context *ctx) | |
217 | { | |
218 | struct inode *inode = filp->f_path.dentry->d_inode; | |
219 | struct super_block *sb = inode->i_sb; | |
220 | struct inode *tmp; | |
221 | struct exfat_dir_entry de; | |
222 | struct exfat_dentry_namebuf *nb = &(de.namebuf); | |
223 | struct exfat_inode_info *ei = EXFAT_I(inode); | |
224 | unsigned long inum; | |
225 | loff_t cpos, i_pos; | |
226 | int err = 0, fake_offset = 0; | |
227 | ||
228 | exfat_init_namebuf(nb); | |
229 | mutex_lock(&EXFAT_SB(sb)->s_lock); | |
230 | ||
231 | cpos = ctx->pos; | |
232 | if (!dir_emit_dots(filp, ctx)) | |
233 | goto unlock; | |
234 | ||
235 | if (ctx->pos == ITER_POS_FILLED_DOTS) { | |
236 | cpos = 0; | |
237 | fake_offset = 1; | |
238 | } | |
239 | ||
240 | if (cpos & (DENTRY_SIZE - 1)) { | |
241 | err = -ENOENT; | |
242 | goto unlock; | |
243 | } | |
244 | ||
245 | /* name buffer should be allocated before use */ | |
246 | err = exfat_alloc_namebuf(nb); | |
247 | if (err) | |
248 | goto unlock; | |
249 | get_new: | |
250 | ei->rwoffset = EXFAT_B_TO_DEN(cpos); | |
251 | ||
252 | if (cpos >= i_size_read(inode)) | |
253 | goto end_of_dir; | |
254 | ||
255 | err = exfat_readdir(inode, &de); | |
256 | if (err) { | |
257 | /* | |
258 | * At least we tried to read a sector. Move cpos to next sector | |
259 | * position (should be aligned). | |
260 | */ | |
261 | if (err == -EIO) { | |
262 | cpos += 1 << (sb->s_blocksize_bits); | |
263 | cpos &= ~(sb->s_blocksize - 1); | |
264 | } | |
265 | ||
266 | err = -EIO; | |
267 | goto end_of_dir; | |
268 | } | |
269 | ||
270 | cpos = EXFAT_DEN_TO_B(ei->rwoffset); | |
271 | ||
272 | if (!nb->lfn[0]) | |
273 | goto end_of_dir; | |
274 | ||
275 | i_pos = ((loff_t)ei->start_clu << 32) | | |
276 | ((ei->rwoffset - 1) & 0xffffffff); | |
277 | tmp = exfat_iget(sb, i_pos); | |
278 | if (tmp) { | |
279 | inum = tmp->i_ino; | |
280 | iput(tmp); | |
281 | } else { | |
282 | inum = iunique(sb, EXFAT_ROOT_INO); | |
283 | } | |
284 | ||
285 | /* | |
286 | * Before calling dir_emit(), sb_lock should be released. | |
287 | * Because page fault can occur in dir_emit() when the size | |
288 | * of buffer given from user is larger than one page size. | |
289 | */ | |
290 | mutex_unlock(&EXFAT_SB(sb)->s_lock); | |
291 | if (!dir_emit(ctx, nb->lfn, strlen(nb->lfn), inum, | |
292 | (de.attr & ATTR_SUBDIR) ? DT_DIR : DT_REG)) | |
293 | goto out_unlocked; | |
294 | mutex_lock(&EXFAT_SB(sb)->s_lock); | |
295 | ctx->pos = cpos; | |
296 | goto get_new; | |
297 | ||
298 | end_of_dir: | |
299 | if (!cpos && fake_offset) | |
300 | cpos = ITER_POS_FILLED_DOTS; | |
301 | ctx->pos = cpos; | |
302 | unlock: | |
303 | mutex_unlock(&EXFAT_SB(sb)->s_lock); | |
304 | out_unlocked: | |
305 | /* | |
306 | * To improve performance, free namebuf after unlock sb_lock. | |
307 | * If namebuf is not allocated, this function do nothing | |
308 | */ | |
309 | exfat_free_namebuf(nb); | |
310 | return err; | |
311 | } | |
312 | ||
313 | const struct file_operations exfat_dir_operations = { | |
314 | .llseek = generic_file_llseek, | |
315 | .read = generic_read_dir, | |
316 | .iterate = exfat_iterate, | |
317 | .fsync = generic_file_fsync, | |
318 | }; | |
319 | ||
320 | int exfat_alloc_new_dir(struct inode *inode, struct exfat_chain *clu) | |
321 | { | |
322 | int ret; | |
323 | ||
324 | exfat_chain_set(clu, EXFAT_EOF_CLUSTER, 0, ALLOC_NO_FAT_CHAIN); | |
325 | ||
326 | ret = exfat_alloc_cluster(inode, 1, clu); | |
327 | if (ret) | |
328 | return ret; | |
329 | ||
330 | return exfat_zeroed_cluster(inode, clu->dir); | |
331 | } | |
332 | ||
333 | int exfat_calc_num_entries(struct exfat_uni_name *p_uniname) | |
334 | { | |
335 | int len; | |
336 | ||
337 | len = p_uniname->name_len; | |
338 | if (len == 0) | |
339 | return -EINVAL; | |
340 | ||
341 | /* 1 file entry + 1 stream entry + name entries */ | |
342 | return ((len - 1) / EXFAT_FILE_NAME_LEN + 3); | |
343 | } | |
344 | ||
345 | unsigned int exfat_get_entry_type(struct exfat_dentry *ep) | |
346 | { | |
347 | if (ep->type == EXFAT_UNUSED) | |
348 | return TYPE_UNUSED; | |
349 | if (IS_EXFAT_DELETED(ep->type)) | |
350 | return TYPE_DELETED; | |
351 | if (ep->type == EXFAT_INVAL) | |
352 | return TYPE_INVALID; | |
353 | if (IS_EXFAT_CRITICAL_PRI(ep->type)) { | |
354 | if (ep->type == EXFAT_BITMAP) | |
355 | return TYPE_BITMAP; | |
356 | if (ep->type == EXFAT_UPCASE) | |
357 | return TYPE_UPCASE; | |
358 | if (ep->type == EXFAT_VOLUME) | |
359 | return TYPE_VOLUME; | |
360 | if (ep->type == EXFAT_FILE) { | |
361 | if (le16_to_cpu(ep->dentry.file.attr) & ATTR_SUBDIR) | |
362 | return TYPE_DIR; | |
363 | return TYPE_FILE; | |
364 | } | |
365 | return TYPE_CRITICAL_PRI; | |
366 | } | |
367 | if (IS_EXFAT_BENIGN_PRI(ep->type)) { | |
368 | if (ep->type == EXFAT_GUID) | |
369 | return TYPE_GUID; | |
370 | if (ep->type == EXFAT_PADDING) | |
371 | return TYPE_PADDING; | |
372 | if (ep->type == EXFAT_ACLTAB) | |
373 | return TYPE_ACLTAB; | |
374 | return TYPE_BENIGN_PRI; | |
375 | } | |
376 | if (IS_EXFAT_CRITICAL_SEC(ep->type)) { | |
377 | if (ep->type == EXFAT_STREAM) | |
378 | return TYPE_STREAM; | |
379 | if (ep->type == EXFAT_NAME) | |
380 | return TYPE_EXTEND; | |
381 | if (ep->type == EXFAT_ACL) | |
382 | return TYPE_ACL; | |
383 | return TYPE_CRITICAL_SEC; | |
384 | } | |
385 | return TYPE_BENIGN_SEC; | |
386 | } | |
387 | ||
388 | static void exfat_set_entry_type(struct exfat_dentry *ep, unsigned int type) | |
389 | { | |
390 | if (type == TYPE_UNUSED) { | |
391 | ep->type = EXFAT_UNUSED; | |
392 | } else if (type == TYPE_DELETED) { | |
393 | ep->type &= EXFAT_DELETE; | |
394 | } else if (type == TYPE_STREAM) { | |
395 | ep->type = EXFAT_STREAM; | |
396 | } else if (type == TYPE_EXTEND) { | |
397 | ep->type = EXFAT_NAME; | |
398 | } else if (type == TYPE_BITMAP) { | |
399 | ep->type = EXFAT_BITMAP; | |
400 | } else if (type == TYPE_UPCASE) { | |
401 | ep->type = EXFAT_UPCASE; | |
402 | } else if (type == TYPE_VOLUME) { | |
403 | ep->type = EXFAT_VOLUME; | |
404 | } else if (type == TYPE_DIR) { | |
405 | ep->type = EXFAT_FILE; | |
406 | ep->dentry.file.attr = cpu_to_le16(ATTR_SUBDIR); | |
407 | } else if (type == TYPE_FILE) { | |
408 | ep->type = EXFAT_FILE; | |
409 | ep->dentry.file.attr = cpu_to_le16(ATTR_ARCHIVE); | |
410 | } | |
411 | } | |
412 | ||
413 | static void exfat_init_stream_entry(struct exfat_dentry *ep, | |
414 | unsigned char flags, unsigned int start_clu, | |
415 | unsigned long long size) | |
416 | { | |
417 | exfat_set_entry_type(ep, TYPE_STREAM); | |
418 | ep->dentry.stream.flags = flags; | |
419 | ep->dentry.stream.start_clu = cpu_to_le32(start_clu); | |
420 | ep->dentry.stream.valid_size = cpu_to_le64(size); | |
421 | ep->dentry.stream.size = cpu_to_le64(size); | |
422 | } | |
423 | ||
424 | static void exfat_init_name_entry(struct exfat_dentry *ep, | |
425 | unsigned short *uniname) | |
426 | { | |
427 | int i; | |
428 | ||
429 | exfat_set_entry_type(ep, TYPE_EXTEND); | |
430 | ep->dentry.name.flags = 0x0; | |
431 | ||
432 | for (i = 0; i < EXFAT_FILE_NAME_LEN; i++) { | |
433 | ep->dentry.name.unicode_0_14[i] = cpu_to_le16(*uniname); | |
434 | if (*uniname == 0x0) | |
435 | break; | |
436 | uniname++; | |
437 | } | |
438 | } | |
439 | ||
440 | int exfat_init_dir_entry(struct inode *inode, struct exfat_chain *p_dir, | |
441 | int entry, unsigned int type, unsigned int start_clu, | |
442 | unsigned long long size) | |
443 | { | |
444 | struct super_block *sb = inode->i_sb; | |
445 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
446 | struct timespec64 ts = current_time(inode); | |
447 | sector_t sector; | |
448 | struct exfat_dentry *ep; | |
449 | struct buffer_head *bh; | |
450 | ||
451 | /* | |
452 | * We cannot use exfat_get_dentry_set here because file ep is not | |
453 | * initialized yet. | |
454 | */ | |
455 | ep = exfat_get_dentry(sb, p_dir, entry, &bh, §or); | |
456 | if (!ep) | |
457 | return -EIO; | |
458 | ||
459 | exfat_set_entry_type(ep, type); | |
460 | exfat_set_entry_time(sbi, &ts, | |
461 | &ep->dentry.file.create_tz, | |
462 | &ep->dentry.file.create_time, | |
463 | &ep->dentry.file.create_date, | |
ed0f84d3 | 464 | &ep->dentry.file.create_time_cs); |
ca061973 NJ |
465 | exfat_set_entry_time(sbi, &ts, |
466 | &ep->dentry.file.modify_tz, | |
467 | &ep->dentry.file.modify_time, | |
468 | &ep->dentry.file.modify_date, | |
ed0f84d3 | 469 | &ep->dentry.file.modify_time_cs); |
ca061973 NJ |
470 | exfat_set_entry_time(sbi, &ts, |
471 | &ep->dentry.file.access_tz, | |
472 | &ep->dentry.file.access_time, | |
473 | &ep->dentry.file.access_date, | |
474 | NULL); | |
475 | ||
476 | exfat_update_bh(sb, bh, IS_DIRSYNC(inode)); | |
477 | brelse(bh); | |
478 | ||
479 | ep = exfat_get_dentry(sb, p_dir, entry + 1, &bh, §or); | |
480 | if (!ep) | |
481 | return -EIO; | |
482 | ||
483 | exfat_init_stream_entry(ep, | |
484 | (type == TYPE_FILE) ? ALLOC_FAT_CHAIN : ALLOC_NO_FAT_CHAIN, | |
485 | start_clu, size); | |
486 | exfat_update_bh(sb, bh, IS_DIRSYNC(inode)); | |
487 | brelse(bh); | |
488 | ||
489 | return 0; | |
490 | } | |
491 | ||
492 | int exfat_update_dir_chksum(struct inode *inode, struct exfat_chain *p_dir, | |
493 | int entry) | |
494 | { | |
495 | struct super_block *sb = inode->i_sb; | |
496 | int ret = 0; | |
497 | int i, num_entries; | |
498 | sector_t sector; | |
499 | unsigned short chksum; | |
500 | struct exfat_dentry *ep, *fep; | |
501 | struct buffer_head *fbh, *bh; | |
502 | ||
503 | fep = exfat_get_dentry(sb, p_dir, entry, &fbh, §or); | |
504 | if (!fep) | |
505 | return -EIO; | |
506 | ||
507 | num_entries = fep->dentry.file.num_ext + 1; | |
508 | chksum = exfat_calc_chksum_2byte(fep, DENTRY_SIZE, 0, CS_DIR_ENTRY); | |
509 | ||
510 | for (i = 1; i < num_entries; i++) { | |
511 | ep = exfat_get_dentry(sb, p_dir, entry + i, &bh, NULL); | |
512 | if (!ep) { | |
513 | ret = -EIO; | |
514 | goto release_fbh; | |
515 | } | |
516 | chksum = exfat_calc_chksum_2byte(ep, DENTRY_SIZE, chksum, | |
517 | CS_DEFAULT); | |
518 | brelse(bh); | |
519 | } | |
520 | ||
521 | fep->dentry.file.checksum = cpu_to_le16(chksum); | |
522 | exfat_update_bh(sb, fbh, IS_DIRSYNC(inode)); | |
523 | release_fbh: | |
524 | brelse(fbh); | |
525 | return ret; | |
526 | } | |
527 | ||
528 | int exfat_init_ext_entry(struct inode *inode, struct exfat_chain *p_dir, | |
529 | int entry, int num_entries, struct exfat_uni_name *p_uniname) | |
530 | { | |
531 | struct super_block *sb = inode->i_sb; | |
532 | int i; | |
533 | sector_t sector; | |
534 | unsigned short *uniname = p_uniname->name; | |
535 | struct exfat_dentry *ep; | |
536 | struct buffer_head *bh; | |
537 | int sync = IS_DIRSYNC(inode); | |
538 | ||
539 | ep = exfat_get_dentry(sb, p_dir, entry, &bh, §or); | |
540 | if (!ep) | |
541 | return -EIO; | |
542 | ||
543 | ep->dentry.file.num_ext = (unsigned char)(num_entries - 1); | |
544 | exfat_update_bh(sb, bh, sync); | |
545 | brelse(bh); | |
546 | ||
547 | ep = exfat_get_dentry(sb, p_dir, entry + 1, &bh, §or); | |
548 | if (!ep) | |
549 | return -EIO; | |
550 | ||
551 | ep->dentry.stream.name_len = p_uniname->name_len; | |
552 | ep->dentry.stream.name_hash = cpu_to_le16(p_uniname->name_hash); | |
553 | exfat_update_bh(sb, bh, sync); | |
554 | brelse(bh); | |
555 | ||
556 | for (i = EXFAT_FIRST_CLUSTER; i < num_entries; i++) { | |
557 | ep = exfat_get_dentry(sb, p_dir, entry + i, &bh, §or); | |
558 | if (!ep) | |
559 | return -EIO; | |
560 | ||
561 | exfat_init_name_entry(ep, uniname); | |
562 | exfat_update_bh(sb, bh, sync); | |
563 | brelse(bh); | |
564 | uniname += EXFAT_FILE_NAME_LEN; | |
565 | } | |
566 | ||
567 | exfat_update_dir_chksum(inode, p_dir, entry); | |
568 | return 0; | |
569 | } | |
570 | ||
571 | int exfat_remove_entries(struct inode *inode, struct exfat_chain *p_dir, | |
572 | int entry, int order, int num_entries) | |
573 | { | |
574 | struct super_block *sb = inode->i_sb; | |
575 | int i; | |
576 | sector_t sector; | |
577 | struct exfat_dentry *ep; | |
578 | struct buffer_head *bh; | |
579 | ||
580 | for (i = order; i < num_entries; i++) { | |
581 | ep = exfat_get_dentry(sb, p_dir, entry + i, &bh, §or); | |
582 | if (!ep) | |
583 | return -EIO; | |
584 | ||
585 | exfat_set_entry_type(ep, TYPE_DELETED); | |
586 | exfat_update_bh(sb, bh, IS_DIRSYNC(inode)); | |
587 | brelse(bh); | |
588 | } | |
589 | ||
590 | return 0; | |
591 | } | |
592 | ||
593 | int exfat_update_dir_chksum_with_entry_set(struct super_block *sb, | |
594 | struct exfat_entry_set_cache *es, int sync) | |
595 | { | |
596 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
597 | struct buffer_head *bh; | |
598 | sector_t sec = es->sector; | |
599 | unsigned int off = es->offset; | |
600 | int chksum_type = CS_DIR_ENTRY, i, num_entries = es->num_entries; | |
601 | unsigned int buf_off = (off - es->offset); | |
602 | unsigned int remaining_byte_in_sector, copy_entries, clu; | |
603 | unsigned short chksum = 0; | |
604 | ||
605 | for (i = 0; i < num_entries; i++) { | |
606 | chksum = exfat_calc_chksum_2byte(&es->entries[i], DENTRY_SIZE, | |
607 | chksum, chksum_type); | |
608 | chksum_type = CS_DEFAULT; | |
609 | } | |
610 | ||
611 | es->entries[0].dentry.file.checksum = cpu_to_le16(chksum); | |
612 | ||
613 | while (num_entries) { | |
614 | /* write per sector base */ | |
615 | remaining_byte_in_sector = (1 << sb->s_blocksize_bits) - off; | |
616 | copy_entries = min_t(int, | |
617 | EXFAT_B_TO_DEN(remaining_byte_in_sector), | |
618 | num_entries); | |
619 | bh = sb_bread(sb, sec); | |
620 | if (!bh) | |
621 | goto err_out; | |
622 | memcpy(bh->b_data + off, | |
623 | (unsigned char *)&es->entries[0] + buf_off, | |
624 | EXFAT_DEN_TO_B(copy_entries)); | |
625 | exfat_update_bh(sb, bh, sync); | |
626 | brelse(bh); | |
627 | num_entries -= copy_entries; | |
628 | ||
629 | if (num_entries) { | |
630 | /* get next sector */ | |
631 | if (exfat_is_last_sector_in_cluster(sbi, sec)) { | |
632 | clu = exfat_sector_to_cluster(sbi, sec); | |
633 | if (es->alloc_flag == ALLOC_NO_FAT_CHAIN) | |
634 | clu++; | |
635 | else if (exfat_get_next_cluster(sb, &clu)) | |
636 | goto err_out; | |
637 | sec = exfat_cluster_to_sector(sbi, clu); | |
638 | } else { | |
639 | sec++; | |
640 | } | |
641 | off = 0; | |
642 | buf_off += EXFAT_DEN_TO_B(copy_entries); | |
643 | } | |
644 | } | |
645 | ||
646 | return 0; | |
647 | err_out: | |
648 | return -EIO; | |
649 | } | |
650 | ||
651 | static int exfat_walk_fat_chain(struct super_block *sb, | |
652 | struct exfat_chain *p_dir, unsigned int byte_offset, | |
653 | unsigned int *clu) | |
654 | { | |
655 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
656 | unsigned int clu_offset; | |
657 | unsigned int cur_clu; | |
658 | ||
659 | clu_offset = EXFAT_B_TO_CLU(byte_offset, sbi); | |
660 | cur_clu = p_dir->dir; | |
661 | ||
662 | if (p_dir->flags == ALLOC_NO_FAT_CHAIN) { | |
663 | cur_clu += clu_offset; | |
664 | } else { | |
665 | while (clu_offset > 0) { | |
666 | if (exfat_get_next_cluster(sb, &cur_clu)) | |
667 | return -EIO; | |
668 | if (cur_clu == EXFAT_EOF_CLUSTER) { | |
669 | exfat_fs_error(sb, | |
670 | "invalid dentry access beyond EOF (clu : %u, eidx : %d)", | |
671 | p_dir->dir, | |
672 | EXFAT_B_TO_DEN(byte_offset)); | |
673 | return -EIO; | |
674 | } | |
675 | clu_offset--; | |
676 | } | |
677 | } | |
678 | ||
679 | *clu = cur_clu; | |
680 | return 0; | |
681 | } | |
682 | ||
683 | int exfat_find_location(struct super_block *sb, struct exfat_chain *p_dir, | |
684 | int entry, sector_t *sector, int *offset) | |
685 | { | |
686 | int ret; | |
687 | unsigned int off, clu = 0; | |
688 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
689 | ||
690 | off = EXFAT_DEN_TO_B(entry); | |
691 | ||
692 | ret = exfat_walk_fat_chain(sb, p_dir, off, &clu); | |
693 | if (ret) | |
694 | return ret; | |
695 | ||
696 | /* byte offset in cluster */ | |
697 | off = EXFAT_CLU_OFFSET(off, sbi); | |
698 | ||
699 | /* byte offset in sector */ | |
700 | *offset = EXFAT_BLK_OFFSET(off, sb); | |
701 | ||
702 | /* sector offset in cluster */ | |
703 | *sector = EXFAT_B_TO_BLK(off, sb); | |
704 | *sector += exfat_cluster_to_sector(sbi, clu); | |
705 | return 0; | |
706 | } | |
707 | ||
708 | #define EXFAT_MAX_RA_SIZE (128*1024) | |
709 | static int exfat_dir_readahead(struct super_block *sb, sector_t sec) | |
710 | { | |
711 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
712 | struct buffer_head *bh; | |
713 | unsigned int max_ra_count = EXFAT_MAX_RA_SIZE >> sb->s_blocksize_bits; | |
714 | unsigned int page_ra_count = PAGE_SIZE >> sb->s_blocksize_bits; | |
715 | unsigned int adj_ra_count = max(sbi->sect_per_clus, page_ra_count); | |
716 | unsigned int ra_count = min(adj_ra_count, max_ra_count); | |
717 | ||
718 | /* Read-ahead is not required */ | |
719 | if (sbi->sect_per_clus == 1) | |
720 | return 0; | |
721 | ||
722 | if (sec < sbi->data_start_sector) { | |
d1727d55 JP |
723 | exfat_err(sb, "requested sector is invalid(sect:%llu, root:%llu)", |
724 | (unsigned long long)sec, sbi->data_start_sector); | |
ca061973 NJ |
725 | return -EIO; |
726 | } | |
727 | ||
728 | /* Not sector aligned with ra_count, resize ra_count to page size */ | |
729 | if ((sec - sbi->data_start_sector) & (ra_count - 1)) | |
730 | ra_count = page_ra_count; | |
731 | ||
732 | bh = sb_find_get_block(sb, sec); | |
733 | if (!bh || !buffer_uptodate(bh)) { | |
734 | unsigned int i; | |
735 | ||
736 | for (i = 0; i < ra_count; i++) | |
737 | sb_breadahead(sb, (sector_t)(sec + i)); | |
738 | } | |
739 | brelse(bh); | |
740 | return 0; | |
741 | } | |
742 | ||
743 | struct exfat_dentry *exfat_get_dentry(struct super_block *sb, | |
744 | struct exfat_chain *p_dir, int entry, struct buffer_head **bh, | |
745 | sector_t *sector) | |
746 | { | |
747 | unsigned int dentries_per_page = EXFAT_B_TO_DEN(PAGE_SIZE); | |
748 | int off; | |
749 | sector_t sec; | |
750 | ||
751 | if (p_dir->dir == DIR_DELETED) { | |
d1727d55 | 752 | exfat_err(sb, "abnormal access to deleted dentry"); |
ca061973 NJ |
753 | return NULL; |
754 | } | |
755 | ||
756 | if (exfat_find_location(sb, p_dir, entry, &sec, &off)) | |
757 | return NULL; | |
758 | ||
759 | if (p_dir->dir != EXFAT_FREE_CLUSTER && | |
760 | !(entry & (dentries_per_page - 1))) | |
761 | exfat_dir_readahead(sb, sec); | |
762 | ||
763 | *bh = sb_bread(sb, sec); | |
764 | if (!*bh) | |
765 | return NULL; | |
766 | ||
767 | if (sector) | |
768 | *sector = sec; | |
769 | return (struct exfat_dentry *)((*bh)->b_data + off); | |
770 | } | |
771 | ||
772 | enum exfat_validate_dentry_mode { | |
773 | ES_MODE_STARTED, | |
774 | ES_MODE_GET_FILE_ENTRY, | |
775 | ES_MODE_GET_STRM_ENTRY, | |
776 | ES_MODE_GET_NAME_ENTRY, | |
777 | ES_MODE_GET_CRITICAL_SEC_ENTRY, | |
778 | }; | |
779 | ||
780 | static bool exfat_validate_entry(unsigned int type, | |
781 | enum exfat_validate_dentry_mode *mode) | |
782 | { | |
783 | if (type == TYPE_UNUSED || type == TYPE_DELETED) | |
784 | return false; | |
785 | ||
786 | switch (*mode) { | |
787 | case ES_MODE_STARTED: | |
788 | if (type != TYPE_FILE && type != TYPE_DIR) | |
789 | return false; | |
790 | *mode = ES_MODE_GET_FILE_ENTRY; | |
791 | return true; | |
792 | case ES_MODE_GET_FILE_ENTRY: | |
793 | if (type != TYPE_STREAM) | |
794 | return false; | |
795 | *mode = ES_MODE_GET_STRM_ENTRY; | |
796 | return true; | |
797 | case ES_MODE_GET_STRM_ENTRY: | |
798 | if (type != TYPE_EXTEND) | |
799 | return false; | |
800 | *mode = ES_MODE_GET_NAME_ENTRY; | |
801 | return true; | |
802 | case ES_MODE_GET_NAME_ENTRY: | |
803 | if (type == TYPE_STREAM) | |
804 | return false; | |
805 | if (type != TYPE_EXTEND) { | |
806 | if (!(type & TYPE_CRITICAL_SEC)) | |
807 | return false; | |
808 | *mode = ES_MODE_GET_CRITICAL_SEC_ENTRY; | |
809 | } | |
810 | return true; | |
811 | case ES_MODE_GET_CRITICAL_SEC_ENTRY: | |
812 | if (type == TYPE_EXTEND || type == TYPE_STREAM) | |
813 | return false; | |
814 | if ((type & TYPE_CRITICAL_SEC) != TYPE_CRITICAL_SEC) | |
815 | return false; | |
816 | return true; | |
817 | default: | |
818 | WARN_ON_ONCE(1); | |
819 | return false; | |
820 | } | |
821 | } | |
822 | ||
823 | /* | |
824 | * Returns a set of dentries for a file or dir. | |
825 | * | |
826 | * Note that this is a copy (dump) of dentries so that user should | |
827 | * call write_entry_set() to apply changes made in this entry set | |
828 | * to the real device. | |
829 | * | |
830 | * in: | |
831 | * sb+p_dir+entry: indicates a file/dir | |
832 | * type: specifies how many dentries should be included. | |
833 | * out: | |
834 | * file_ep: will point the first dentry(= file dentry) on success | |
835 | * return: | |
836 | * pointer of entry set on success, | |
837 | * NULL on failure. | |
838 | */ | |
839 | struct exfat_entry_set_cache *exfat_get_dentry_set(struct super_block *sb, | |
840 | struct exfat_chain *p_dir, int entry, unsigned int type, | |
841 | struct exfat_dentry **file_ep) | |
842 | { | |
843 | int ret; | |
844 | unsigned int off, byte_offset, clu = 0; | |
845 | unsigned int entry_type; | |
846 | sector_t sec; | |
847 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
848 | struct exfat_entry_set_cache *es; | |
849 | struct exfat_dentry *ep, *pos; | |
850 | unsigned char num_entries; | |
851 | enum exfat_validate_dentry_mode mode = ES_MODE_STARTED; | |
852 | struct buffer_head *bh; | |
853 | ||
854 | if (p_dir->dir == DIR_DELETED) { | |
d1727d55 | 855 | exfat_err(sb, "access to deleted dentry"); |
ca061973 NJ |
856 | return NULL; |
857 | } | |
858 | ||
859 | byte_offset = EXFAT_DEN_TO_B(entry); | |
860 | ret = exfat_walk_fat_chain(sb, p_dir, byte_offset, &clu); | |
861 | if (ret) | |
862 | return NULL; | |
863 | ||
864 | /* byte offset in cluster */ | |
865 | byte_offset = EXFAT_CLU_OFFSET(byte_offset, sbi); | |
866 | ||
867 | /* byte offset in sector */ | |
868 | off = EXFAT_BLK_OFFSET(byte_offset, sb); | |
869 | ||
870 | /* sector offset in cluster */ | |
871 | sec = EXFAT_B_TO_BLK(byte_offset, sb); | |
872 | sec += exfat_cluster_to_sector(sbi, clu); | |
873 | ||
874 | bh = sb_bread(sb, sec); | |
875 | if (!bh) | |
876 | return NULL; | |
877 | ||
878 | ep = (struct exfat_dentry *)(bh->b_data + off); | |
879 | entry_type = exfat_get_entry_type(ep); | |
880 | ||
881 | if (entry_type != TYPE_FILE && entry_type != TYPE_DIR) | |
882 | goto release_bh; | |
883 | ||
884 | num_entries = type == ES_ALL_ENTRIES ? | |
885 | ep->dentry.file.num_ext + 1 : type; | |
886 | es = kmalloc(struct_size(es, entries, num_entries), GFP_KERNEL); | |
887 | if (!es) | |
888 | goto release_bh; | |
889 | ||
890 | es->num_entries = num_entries; | |
891 | es->sector = sec; | |
892 | es->offset = off; | |
893 | es->alloc_flag = p_dir->flags; | |
894 | ||
895 | pos = &es->entries[0]; | |
896 | ||
897 | while (num_entries) { | |
898 | if (!exfat_validate_entry(exfat_get_entry_type(ep), &mode)) | |
899 | goto free_es; | |
900 | ||
901 | /* copy dentry */ | |
902 | memcpy(pos, ep, sizeof(struct exfat_dentry)); | |
903 | ||
904 | if (--num_entries == 0) | |
905 | break; | |
906 | ||
907 | if (((off + DENTRY_SIZE) & (sb->s_blocksize - 1)) < | |
908 | (off & (sb->s_blocksize - 1))) { | |
909 | /* get the next sector */ | |
910 | if (exfat_is_last_sector_in_cluster(sbi, sec)) { | |
911 | if (es->alloc_flag == ALLOC_NO_FAT_CHAIN) | |
912 | clu++; | |
913 | else if (exfat_get_next_cluster(sb, &clu)) | |
914 | goto free_es; | |
915 | sec = exfat_cluster_to_sector(sbi, clu); | |
916 | } else { | |
917 | sec++; | |
918 | } | |
919 | ||
920 | brelse(bh); | |
921 | bh = sb_bread(sb, sec); | |
922 | if (!bh) | |
923 | goto free_es; | |
924 | off = 0; | |
925 | ep = (struct exfat_dentry *)bh->b_data; | |
926 | } else { | |
927 | ep++; | |
928 | off += DENTRY_SIZE; | |
929 | } | |
930 | pos++; | |
931 | } | |
932 | ||
933 | if (file_ep) | |
934 | *file_ep = &es->entries[0]; | |
935 | brelse(bh); | |
936 | return es; | |
937 | ||
938 | free_es: | |
939 | kfree(es); | |
940 | release_bh: | |
941 | brelse(bh); | |
942 | return NULL; | |
943 | } | |
944 | ||
945 | enum { | |
946 | DIRENT_STEP_FILE, | |
947 | DIRENT_STEP_STRM, | |
948 | DIRENT_STEP_NAME, | |
949 | DIRENT_STEP_SECD, | |
950 | }; | |
951 | ||
952 | /* | |
953 | * return values: | |
954 | * >= 0 : return dir entiry position with the name in dir | |
955 | * -EEXIST : (root dir, ".") it is the root dir itself | |
956 | * -ENOENT : entry with the name does not exist | |
957 | * -EIO : I/O error | |
958 | */ | |
959 | int exfat_find_dir_entry(struct super_block *sb, struct exfat_inode_info *ei, | |
960 | struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname, | |
961 | int num_entries, unsigned int type) | |
962 | { | |
963 | int i, rewind = 0, dentry = 0, end_eidx = 0, num_ext = 0, len; | |
964 | int order, step, name_len = 0; | |
965 | int dentries_per_clu, num_empty = 0; | |
966 | unsigned int entry_type; | |
967 | unsigned short *uniname = NULL; | |
968 | struct exfat_chain clu; | |
969 | struct exfat_hint *hint_stat = &ei->hint_stat; | |
970 | struct exfat_hint_femp candi_empty; | |
971 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
972 | ||
973 | dentries_per_clu = sbi->dentries_per_clu; | |
974 | ||
975 | exfat_chain_dup(&clu, p_dir); | |
976 | ||
977 | if (hint_stat->eidx) { | |
978 | clu.dir = hint_stat->clu; | |
979 | dentry = hint_stat->eidx; | |
980 | end_eidx = dentry; | |
981 | } | |
982 | ||
983 | candi_empty.eidx = EXFAT_HINT_NONE; | |
984 | rewind: | |
985 | order = 0; | |
986 | step = DIRENT_STEP_FILE; | |
987 | while (clu.dir != EXFAT_EOF_CLUSTER) { | |
988 | i = dentry & (dentries_per_clu - 1); | |
989 | for (; i < dentries_per_clu; i++, dentry++) { | |
990 | struct exfat_dentry *ep; | |
991 | struct buffer_head *bh; | |
992 | ||
993 | if (rewind && dentry == end_eidx) | |
994 | goto not_found; | |
995 | ||
996 | ep = exfat_get_dentry(sb, &clu, i, &bh, NULL); | |
997 | if (!ep) | |
998 | return -EIO; | |
999 | ||
1000 | entry_type = exfat_get_entry_type(ep); | |
1001 | ||
1002 | if (entry_type == TYPE_UNUSED || | |
1003 | entry_type == TYPE_DELETED) { | |
1004 | step = DIRENT_STEP_FILE; | |
1005 | ||
1006 | num_empty++; | |
1007 | if (candi_empty.eidx == EXFAT_HINT_NONE && | |
1008 | num_empty == 1) { | |
1009 | exfat_chain_set(&candi_empty.cur, | |
1010 | clu.dir, clu.size, clu.flags); | |
1011 | } | |
1012 | ||
1013 | if (candi_empty.eidx == EXFAT_HINT_NONE && | |
1014 | num_empty >= num_entries) { | |
1015 | candi_empty.eidx = | |
1016 | dentry - (num_empty - 1); | |
1017 | WARN_ON(candi_empty.eidx < 0); | |
1018 | candi_empty.count = num_empty; | |
1019 | ||
1020 | if (ei->hint_femp.eidx == | |
1021 | EXFAT_HINT_NONE || | |
1022 | candi_empty.eidx <= | |
1023 | ei->hint_femp.eidx) { | |
1024 | memcpy(&ei->hint_femp, | |
1025 | &candi_empty, | |
1026 | sizeof(candi_empty)); | |
1027 | } | |
1028 | } | |
1029 | ||
1030 | brelse(bh); | |
1031 | if (entry_type == TYPE_UNUSED) | |
1032 | goto not_found; | |
1033 | continue; | |
1034 | } | |
1035 | ||
1036 | num_empty = 0; | |
1037 | candi_empty.eidx = EXFAT_HINT_NONE; | |
1038 | ||
1039 | if (entry_type == TYPE_FILE || entry_type == TYPE_DIR) { | |
1040 | step = DIRENT_STEP_FILE; | |
1041 | if (type == TYPE_ALL || type == entry_type) { | |
1042 | num_ext = ep->dentry.file.num_ext; | |
1043 | step = DIRENT_STEP_STRM; | |
1044 | } | |
1045 | brelse(bh); | |
1046 | continue; | |
1047 | } | |
1048 | ||
1049 | if (entry_type == TYPE_STREAM) { | |
1050 | unsigned short name_hash; | |
1051 | ||
1052 | if (step != DIRENT_STEP_STRM) { | |
1053 | step = DIRENT_STEP_FILE; | |
1054 | brelse(bh); | |
1055 | continue; | |
1056 | } | |
1057 | step = DIRENT_STEP_FILE; | |
1058 | name_hash = le16_to_cpu( | |
1059 | ep->dentry.stream.name_hash); | |
1060 | if (p_uniname->name_hash == name_hash && | |
1061 | p_uniname->name_len == | |
1062 | ep->dentry.stream.name_len) { | |
1063 | step = DIRENT_STEP_NAME; | |
1064 | order = 1; | |
1065 | name_len = 0; | |
1066 | } | |
1067 | brelse(bh); | |
1068 | continue; | |
1069 | } | |
1070 | ||
1071 | brelse(bh); | |
1072 | if (entry_type == TYPE_EXTEND) { | |
1073 | unsigned short entry_uniname[16], unichar; | |
1074 | ||
1075 | if (step != DIRENT_STEP_NAME) { | |
1076 | step = DIRENT_STEP_FILE; | |
1077 | continue; | |
1078 | } | |
1079 | ||
1080 | if (++order == 2) | |
1081 | uniname = p_uniname->name; | |
1082 | else | |
1083 | uniname += EXFAT_FILE_NAME_LEN; | |
1084 | ||
1085 | len = exfat_extract_uni_name(ep, entry_uniname); | |
1086 | name_len += len; | |
1087 | ||
1088 | unichar = *(uniname+len); | |
1089 | *(uniname+len) = 0x0; | |
1090 | ||
1091 | if (exfat_uniname_ncmp(sb, uniname, | |
1092 | entry_uniname, len)) { | |
1093 | step = DIRENT_STEP_FILE; | |
1094 | } else if (p_uniname->name_len == name_len) { | |
1095 | if (order == num_ext) | |
1096 | goto found; | |
1097 | step = DIRENT_STEP_SECD; | |
1098 | } | |
1099 | ||
1100 | *(uniname+len) = unichar; | |
1101 | continue; | |
1102 | } | |
1103 | ||
1104 | if (entry_type & | |
1105 | (TYPE_CRITICAL_SEC | TYPE_BENIGN_SEC)) { | |
1106 | if (step == DIRENT_STEP_SECD) { | |
1107 | if (++order == num_ext) | |
1108 | goto found; | |
1109 | continue; | |
1110 | } | |
1111 | } | |
1112 | step = DIRENT_STEP_FILE; | |
1113 | } | |
1114 | ||
1115 | if (clu.flags == ALLOC_NO_FAT_CHAIN) { | |
1116 | if (--clu.size > 0) | |
1117 | clu.dir++; | |
1118 | else | |
1119 | clu.dir = EXFAT_EOF_CLUSTER; | |
1120 | } else { | |
1121 | if (exfat_get_next_cluster(sb, &clu.dir)) | |
1122 | return -EIO; | |
1123 | } | |
1124 | } | |
1125 | ||
1126 | not_found: | |
1127 | /* | |
1128 | * We started at not 0 index,so we should try to find target | |
1129 | * from 0 index to the index we started at. | |
1130 | */ | |
1131 | if (!rewind && end_eidx) { | |
1132 | rewind = 1; | |
1133 | dentry = 0; | |
1134 | clu.dir = p_dir->dir; | |
1135 | /* reset empty hint */ | |
1136 | num_empty = 0; | |
1137 | candi_empty.eidx = EXFAT_HINT_NONE; | |
1138 | goto rewind; | |
1139 | } | |
1140 | ||
1141 | /* initialized hint_stat */ | |
1142 | hint_stat->clu = p_dir->dir; | |
1143 | hint_stat->eidx = 0; | |
1144 | return -ENOENT; | |
1145 | ||
1146 | found: | |
1147 | /* next dentry we'll find is out of this cluster */ | |
1148 | if (!((dentry + 1) & (dentries_per_clu - 1))) { | |
1149 | int ret = 0; | |
1150 | ||
1151 | if (clu.flags == ALLOC_NO_FAT_CHAIN) { | |
1152 | if (--clu.size > 0) | |
1153 | clu.dir++; | |
1154 | else | |
1155 | clu.dir = EXFAT_EOF_CLUSTER; | |
1156 | } else { | |
1157 | ret = exfat_get_next_cluster(sb, &clu.dir); | |
1158 | } | |
1159 | ||
1160 | if (ret || clu.dir != EXFAT_EOF_CLUSTER) { | |
1161 | /* just initialized hint_stat */ | |
1162 | hint_stat->clu = p_dir->dir; | |
1163 | hint_stat->eidx = 0; | |
1164 | return (dentry - num_ext); | |
1165 | } | |
1166 | } | |
1167 | ||
1168 | hint_stat->clu = clu.dir; | |
1169 | hint_stat->eidx = dentry + 1; | |
1170 | return dentry - num_ext; | |
1171 | } | |
1172 | ||
1173 | int exfat_count_ext_entries(struct super_block *sb, struct exfat_chain *p_dir, | |
1174 | int entry, struct exfat_dentry *ep) | |
1175 | { | |
1176 | int i, count = 0; | |
1177 | unsigned int type; | |
1178 | struct exfat_dentry *ext_ep; | |
1179 | struct buffer_head *bh; | |
1180 | ||
1181 | for (i = 0, entry++; i < ep->dentry.file.num_ext; i++, entry++) { | |
1182 | ext_ep = exfat_get_dentry(sb, p_dir, entry, &bh, NULL); | |
1183 | if (!ext_ep) | |
1184 | return -EIO; | |
1185 | ||
1186 | type = exfat_get_entry_type(ext_ep); | |
1187 | brelse(bh); | |
1188 | if (type == TYPE_EXTEND || type == TYPE_STREAM) | |
1189 | count++; | |
1190 | else | |
1191 | break; | |
1192 | } | |
1193 | return count; | |
1194 | } | |
1195 | ||
1196 | int exfat_count_dir_entries(struct super_block *sb, struct exfat_chain *p_dir) | |
1197 | { | |
1198 | int i, count = 0; | |
1199 | int dentries_per_clu; | |
1200 | unsigned int entry_type; | |
1201 | struct exfat_chain clu; | |
1202 | struct exfat_dentry *ep; | |
1203 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
1204 | struct buffer_head *bh; | |
1205 | ||
1206 | dentries_per_clu = sbi->dentries_per_clu; | |
1207 | ||
1208 | exfat_chain_dup(&clu, p_dir); | |
1209 | ||
1210 | while (clu.dir != EXFAT_EOF_CLUSTER) { | |
1211 | for (i = 0; i < dentries_per_clu; i++) { | |
1212 | ep = exfat_get_dentry(sb, &clu, i, &bh, NULL); | |
1213 | if (!ep) | |
1214 | return -EIO; | |
1215 | entry_type = exfat_get_entry_type(ep); | |
1216 | brelse(bh); | |
1217 | ||
1218 | if (entry_type == TYPE_UNUSED) | |
1219 | return count; | |
1220 | if (entry_type != TYPE_DIR) | |
1221 | continue; | |
1222 | count++; | |
1223 | } | |
1224 | ||
1225 | if (clu.flags == ALLOC_NO_FAT_CHAIN) { | |
1226 | if (--clu.size > 0) | |
1227 | clu.dir++; | |
1228 | else | |
1229 | clu.dir = EXFAT_EOF_CLUSTER; | |
1230 | } else { | |
1231 | if (exfat_get_next_cluster(sb, &(clu.dir))) | |
1232 | return -EIO; | |
1233 | } | |
1234 | } | |
1235 | ||
1236 | return count; | |
1237 | } |