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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> | |
654762df | 7 | #include <linux/compat.h> |
ca061973 NJ |
8 | #include <linux/bio.h> |
9 | #include <linux/buffer_head.h> | |
10 | ||
11 | #include "exfat_raw.h" | |
12 | #include "exfat_fs.h" | |
13 | ||
14 | static int exfat_extract_uni_name(struct exfat_dentry *ep, | |
15 | unsigned short *uniname) | |
16 | { | |
17 | int i, len = 0; | |
18 | ||
19 | for (i = 0; i < EXFAT_FILE_NAME_LEN; i++) { | |
20 | *uniname = le16_to_cpu(ep->dentry.name.unicode_0_14[i]); | |
21 | if (*uniname == 0x0) | |
22 | return len; | |
23 | uniname++; | |
24 | len++; | |
25 | } | |
26 | ||
27 | *uniname = 0x0; | |
28 | return len; | |
29 | ||
30 | } | |
31 | ||
32 | static void exfat_get_uniname_from_ext_entry(struct super_block *sb, | |
33 | struct exfat_chain *p_dir, int entry, unsigned short *uniname) | |
34 | { | |
35 | int i; | |
ca061973 NJ |
36 | struct exfat_entry_set_cache *es; |
37 | ||
943af1fd | 38 | es = exfat_get_dentry_set(sb, p_dir, entry, ES_ALL_ENTRIES); |
ca061973 NJ |
39 | if (!es) |
40 | return; | |
41 | ||
ca061973 NJ |
42 | /* |
43 | * First entry : file entry | |
44 | * Second entry : stream-extension entry | |
45 | * Third entry : first file-name entry | |
46 | * So, the index of first file-name dentry should start from 2. | |
47 | */ | |
943af1fd TK |
48 | for (i = 2; i < es->num_entries; i++) { |
49 | struct exfat_dentry *ep = exfat_get_dentry_cached(es, i); | |
50 | ||
ca061973 NJ |
51 | /* end of name entry */ |
52 | if (exfat_get_entry_type(ep) != TYPE_EXTEND) | |
943af1fd | 53 | break; |
ca061973 NJ |
54 | |
55 | exfat_extract_uni_name(ep, uniname); | |
56 | uniname += EXFAT_FILE_NAME_LEN; | |
57 | } | |
58 | ||
943af1fd | 59 | exfat_free_dentry_set(es, false); |
ca061973 NJ |
60 | } |
61 | ||
62 | /* read a directory entry from the opened directory */ | |
04cee52f | 63 | static int exfat_readdir(struct inode *inode, loff_t *cpos, struct exfat_dir_entry *dir_entry) |
ca061973 | 64 | { |
04cee52f | 65 | int i, dentries_per_clu, dentries_per_clu_bits = 0, num_ext; |
ca061973 NJ |
66 | unsigned int type, clu_offset; |
67 | sector_t sector; | |
68 | struct exfat_chain dir, clu; | |
69 | struct exfat_uni_name uni_name; | |
70 | struct exfat_dentry *ep; | |
71 | struct super_block *sb = inode->i_sb; | |
72 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
73 | struct exfat_inode_info *ei = EXFAT_I(inode); | |
04cee52f | 74 | unsigned int dentry = EXFAT_B_TO_DEN(*cpos) & 0xFFFFFFFF; |
ca061973 NJ |
75 | struct buffer_head *bh; |
76 | ||
77 | /* check if the given file ID is opened */ | |
78 | if (ei->type != TYPE_DIR) | |
79 | return -EPERM; | |
80 | ||
81 | if (ei->entry == -1) | |
82 | exfat_chain_set(&dir, sbi->root_dir, 0, ALLOC_FAT_CHAIN); | |
83 | else | |
84 | exfat_chain_set(&dir, ei->start_clu, | |
85 | EXFAT_B_TO_CLU(i_size_read(inode), sbi), ei->flags); | |
86 | ||
87 | dentries_per_clu = sbi->dentries_per_clu; | |
88 | dentries_per_clu_bits = ilog2(dentries_per_clu); | |
89 | ||
90 | clu_offset = dentry >> dentries_per_clu_bits; | |
91 | exfat_chain_dup(&clu, &dir); | |
92 | ||
93 | if (clu.flags == ALLOC_NO_FAT_CHAIN) { | |
94 | clu.dir += clu_offset; | |
95 | clu.size -= clu_offset; | |
96 | } else { | |
97 | /* hint_information */ | |
98 | if (clu_offset > 0 && ei->hint_bmap.off != EXFAT_EOF_CLUSTER && | |
99 | ei->hint_bmap.off > 0 && clu_offset >= ei->hint_bmap.off) { | |
100 | clu_offset -= ei->hint_bmap.off; | |
101 | clu.dir = ei->hint_bmap.clu; | |
102 | } | |
103 | ||
104 | while (clu_offset > 0) { | |
105 | if (exfat_get_next_cluster(sb, &(clu.dir))) | |
106 | return -EIO; | |
107 | ||
108 | clu_offset--; | |
109 | } | |
110 | } | |
111 | ||
112 | while (clu.dir != EXFAT_EOF_CLUSTER) { | |
113 | i = dentry & (dentries_per_clu - 1); | |
114 | ||
115 | for ( ; i < dentries_per_clu; i++, dentry++) { | |
116 | ep = exfat_get_dentry(sb, &clu, i, &bh, §or); | |
117 | if (!ep) | |
118 | return -EIO; | |
119 | ||
120 | type = exfat_get_entry_type(ep); | |
121 | if (type == TYPE_UNUSED) { | |
122 | brelse(bh); | |
123 | break; | |
124 | } | |
125 | ||
126 | if (type != TYPE_FILE && type != TYPE_DIR) { | |
127 | brelse(bh); | |
128 | continue; | |
129 | } | |
130 | ||
04cee52f | 131 | num_ext = ep->dentry.file.num_ext; |
ca061973 NJ |
132 | dir_entry->attr = le16_to_cpu(ep->dentry.file.attr); |
133 | exfat_get_entry_time(sbi, &dir_entry->crtime, | |
134 | ep->dentry.file.create_tz, | |
135 | ep->dentry.file.create_time, | |
136 | ep->dentry.file.create_date, | |
ed0f84d3 | 137 | ep->dentry.file.create_time_cs); |
ca061973 NJ |
138 | exfat_get_entry_time(sbi, &dir_entry->mtime, |
139 | ep->dentry.file.modify_tz, | |
140 | ep->dentry.file.modify_time, | |
141 | ep->dentry.file.modify_date, | |
ed0f84d3 | 142 | ep->dentry.file.modify_time_cs); |
ca061973 NJ |
143 | exfat_get_entry_time(sbi, &dir_entry->atime, |
144 | ep->dentry.file.access_tz, | |
145 | ep->dentry.file.access_time, | |
146 | ep->dentry.file.access_date, | |
147 | 0); | |
148 | ||
149 | *uni_name.name = 0x0; | |
c6e2f52e | 150 | exfat_get_uniname_from_ext_entry(sb, &clu, i, |
ca061973 NJ |
151 | uni_name.name); |
152 | exfat_utf16_to_nls(sb, &uni_name, | |
153 | dir_entry->namebuf.lfn, | |
154 | dir_entry->namebuf.lfnbuf_len); | |
155 | brelse(bh); | |
156 | ||
157 | ep = exfat_get_dentry(sb, &clu, i + 1, &bh, NULL); | |
158 | if (!ep) | |
159 | return -EIO; | |
160 | dir_entry->size = | |
161 | le64_to_cpu(ep->dentry.stream.valid_size); | |
04cee52f | 162 | dir_entry->entry = dentry; |
ca061973 NJ |
163 | brelse(bh); |
164 | ||
165 | ei->hint_bmap.off = dentry >> dentries_per_clu_bits; | |
166 | ei->hint_bmap.clu = clu.dir; | |
167 | ||
04cee52f | 168 | *cpos = EXFAT_DEN_TO_B(dentry + 1 + num_ext); |
ca061973 NJ |
169 | return 0; |
170 | } | |
171 | ||
172 | if (clu.flags == ALLOC_NO_FAT_CHAIN) { | |
173 | if (--clu.size > 0) | |
174 | clu.dir++; | |
175 | else | |
176 | clu.dir = EXFAT_EOF_CLUSTER; | |
177 | } else { | |
178 | if (exfat_get_next_cluster(sb, &(clu.dir))) | |
179 | return -EIO; | |
180 | } | |
181 | } | |
182 | ||
183 | dir_entry->namebuf.lfn[0] = '\0'; | |
04cee52f | 184 | *cpos = EXFAT_DEN_TO_B(dentry); |
ca061973 NJ |
185 | return 0; |
186 | } | |
187 | ||
188 | static void exfat_init_namebuf(struct exfat_dentry_namebuf *nb) | |
189 | { | |
190 | nb->lfn = NULL; | |
191 | nb->lfnbuf_len = 0; | |
192 | } | |
193 | ||
194 | static int exfat_alloc_namebuf(struct exfat_dentry_namebuf *nb) | |
195 | { | |
196 | nb->lfn = __getname(); | |
197 | if (!nb->lfn) | |
198 | return -ENOMEM; | |
199 | nb->lfnbuf_len = MAX_VFSNAME_BUF_SIZE; | |
200 | return 0; | |
201 | } | |
202 | ||
203 | static void exfat_free_namebuf(struct exfat_dentry_namebuf *nb) | |
204 | { | |
205 | if (!nb->lfn) | |
206 | return; | |
207 | ||
208 | __putname(nb->lfn); | |
209 | exfat_init_namebuf(nb); | |
210 | } | |
211 | ||
212 | /* skip iterating emit_dots when dir is empty */ | |
213 | #define ITER_POS_FILLED_DOTS (2) | |
214 | static int exfat_iterate(struct file *filp, struct dir_context *ctx) | |
215 | { | |
216 | struct inode *inode = filp->f_path.dentry->d_inode; | |
217 | struct super_block *sb = inode->i_sb; | |
218 | struct inode *tmp; | |
219 | struct exfat_dir_entry de; | |
220 | struct exfat_dentry_namebuf *nb = &(de.namebuf); | |
221 | struct exfat_inode_info *ei = EXFAT_I(inode); | |
222 | unsigned long inum; | |
223 | loff_t cpos, i_pos; | |
224 | int err = 0, fake_offset = 0; | |
225 | ||
226 | exfat_init_namebuf(nb); | |
227 | mutex_lock(&EXFAT_SB(sb)->s_lock); | |
228 | ||
229 | cpos = ctx->pos; | |
230 | if (!dir_emit_dots(filp, ctx)) | |
231 | goto unlock; | |
232 | ||
233 | if (ctx->pos == ITER_POS_FILLED_DOTS) { | |
234 | cpos = 0; | |
235 | fake_offset = 1; | |
236 | } | |
237 | ||
238 | if (cpos & (DENTRY_SIZE - 1)) { | |
239 | err = -ENOENT; | |
240 | goto unlock; | |
241 | } | |
242 | ||
243 | /* name buffer should be allocated before use */ | |
244 | err = exfat_alloc_namebuf(nb); | |
245 | if (err) | |
246 | goto unlock; | |
247 | get_new: | |
ca061973 NJ |
248 | if (cpos >= i_size_read(inode)) |
249 | goto end_of_dir; | |
250 | ||
04cee52f | 251 | err = exfat_readdir(inode, &cpos, &de); |
ca061973 NJ |
252 | if (err) { |
253 | /* | |
254 | * At least we tried to read a sector. Move cpos to next sector | |
255 | * position (should be aligned). | |
256 | */ | |
257 | if (err == -EIO) { | |
258 | cpos += 1 << (sb->s_blocksize_bits); | |
259 | cpos &= ~(sb->s_blocksize - 1); | |
260 | } | |
261 | ||
262 | err = -EIO; | |
263 | goto end_of_dir; | |
264 | } | |
265 | ||
ca061973 NJ |
266 | if (!nb->lfn[0]) |
267 | goto end_of_dir; | |
268 | ||
04cee52f | 269 | i_pos = ((loff_t)ei->start_clu << 32) | (de.entry & 0xffffffff); |
ca061973 NJ |
270 | tmp = exfat_iget(sb, i_pos); |
271 | if (tmp) { | |
272 | inum = tmp->i_ino; | |
273 | iput(tmp); | |
274 | } else { | |
275 | inum = iunique(sb, EXFAT_ROOT_INO); | |
276 | } | |
277 | ||
278 | /* | |
279 | * Before calling dir_emit(), sb_lock should be released. | |
280 | * Because page fault can occur in dir_emit() when the size | |
281 | * of buffer given from user is larger than one page size. | |
282 | */ | |
283 | mutex_unlock(&EXFAT_SB(sb)->s_lock); | |
284 | if (!dir_emit(ctx, nb->lfn, strlen(nb->lfn), inum, | |
285 | (de.attr & ATTR_SUBDIR) ? DT_DIR : DT_REG)) | |
286 | goto out_unlocked; | |
287 | mutex_lock(&EXFAT_SB(sb)->s_lock); | |
288 | ctx->pos = cpos; | |
289 | goto get_new; | |
290 | ||
291 | end_of_dir: | |
292 | if (!cpos && fake_offset) | |
293 | cpos = ITER_POS_FILLED_DOTS; | |
294 | ctx->pos = cpos; | |
295 | unlock: | |
296 | mutex_unlock(&EXFAT_SB(sb)->s_lock); | |
297 | out_unlocked: | |
298 | /* | |
299 | * To improve performance, free namebuf after unlock sb_lock. | |
300 | * If namebuf is not allocated, this function do nothing | |
301 | */ | |
302 | exfat_free_namebuf(nb); | |
303 | return err; | |
304 | } | |
305 | ||
306 | const struct file_operations exfat_dir_operations = { | |
307 | .llseek = generic_file_llseek, | |
308 | .read = generic_read_dir, | |
309 | .iterate = exfat_iterate, | |
654762df HK |
310 | .unlocked_ioctl = exfat_ioctl, |
311 | #ifdef CONFIG_COMPAT | |
312 | .compat_ioctl = exfat_compat_ioctl, | |
313 | #endif | |
5267456e | 314 | .fsync = exfat_file_fsync, |
ca061973 NJ |
315 | }; |
316 | ||
317 | int exfat_alloc_new_dir(struct inode *inode, struct exfat_chain *clu) | |
318 | { | |
319 | int ret; | |
320 | ||
321 | exfat_chain_set(clu, EXFAT_EOF_CLUSTER, 0, ALLOC_NO_FAT_CHAIN); | |
322 | ||
23befe49 | 323 | ret = exfat_alloc_cluster(inode, 1, clu, IS_DIRSYNC(inode)); |
ca061973 NJ |
324 | if (ret) |
325 | return ret; | |
326 | ||
327 | return exfat_zeroed_cluster(inode, clu->dir); | |
328 | } | |
329 | ||
330 | int exfat_calc_num_entries(struct exfat_uni_name *p_uniname) | |
331 | { | |
332 | int len; | |
333 | ||
334 | len = p_uniname->name_len; | |
335 | if (len == 0) | |
336 | return -EINVAL; | |
337 | ||
338 | /* 1 file entry + 1 stream entry + name entries */ | |
339 | return ((len - 1) / EXFAT_FILE_NAME_LEN + 3); | |
340 | } | |
341 | ||
342 | unsigned int exfat_get_entry_type(struct exfat_dentry *ep) | |
343 | { | |
344 | if (ep->type == EXFAT_UNUSED) | |
345 | return TYPE_UNUSED; | |
346 | if (IS_EXFAT_DELETED(ep->type)) | |
347 | return TYPE_DELETED; | |
348 | if (ep->type == EXFAT_INVAL) | |
349 | return TYPE_INVALID; | |
350 | if (IS_EXFAT_CRITICAL_PRI(ep->type)) { | |
351 | if (ep->type == EXFAT_BITMAP) | |
352 | return TYPE_BITMAP; | |
353 | if (ep->type == EXFAT_UPCASE) | |
354 | return TYPE_UPCASE; | |
355 | if (ep->type == EXFAT_VOLUME) | |
356 | return TYPE_VOLUME; | |
357 | if (ep->type == EXFAT_FILE) { | |
358 | if (le16_to_cpu(ep->dentry.file.attr) & ATTR_SUBDIR) | |
359 | return TYPE_DIR; | |
360 | return TYPE_FILE; | |
361 | } | |
362 | return TYPE_CRITICAL_PRI; | |
363 | } | |
364 | if (IS_EXFAT_BENIGN_PRI(ep->type)) { | |
365 | if (ep->type == EXFAT_GUID) | |
366 | return TYPE_GUID; | |
367 | if (ep->type == EXFAT_PADDING) | |
368 | return TYPE_PADDING; | |
369 | if (ep->type == EXFAT_ACLTAB) | |
370 | return TYPE_ACLTAB; | |
371 | return TYPE_BENIGN_PRI; | |
372 | } | |
373 | if (IS_EXFAT_CRITICAL_SEC(ep->type)) { | |
374 | if (ep->type == EXFAT_STREAM) | |
375 | return TYPE_STREAM; | |
376 | if (ep->type == EXFAT_NAME) | |
377 | return TYPE_EXTEND; | |
378 | if (ep->type == EXFAT_ACL) | |
379 | return TYPE_ACL; | |
380 | return TYPE_CRITICAL_SEC; | |
381 | } | |
382 | return TYPE_BENIGN_SEC; | |
383 | } | |
384 | ||
385 | static void exfat_set_entry_type(struct exfat_dentry *ep, unsigned int type) | |
386 | { | |
387 | if (type == TYPE_UNUSED) { | |
388 | ep->type = EXFAT_UNUSED; | |
389 | } else if (type == TYPE_DELETED) { | |
390 | ep->type &= EXFAT_DELETE; | |
391 | } else if (type == TYPE_STREAM) { | |
392 | ep->type = EXFAT_STREAM; | |
393 | } else if (type == TYPE_EXTEND) { | |
394 | ep->type = EXFAT_NAME; | |
395 | } else if (type == TYPE_BITMAP) { | |
396 | ep->type = EXFAT_BITMAP; | |
397 | } else if (type == TYPE_UPCASE) { | |
398 | ep->type = EXFAT_UPCASE; | |
399 | } else if (type == TYPE_VOLUME) { | |
400 | ep->type = EXFAT_VOLUME; | |
401 | } else if (type == TYPE_DIR) { | |
402 | ep->type = EXFAT_FILE; | |
403 | ep->dentry.file.attr = cpu_to_le16(ATTR_SUBDIR); | |
404 | } else if (type == TYPE_FILE) { | |
405 | ep->type = EXFAT_FILE; | |
406 | ep->dentry.file.attr = cpu_to_le16(ATTR_ARCHIVE); | |
407 | } | |
408 | } | |
409 | ||
410 | static void exfat_init_stream_entry(struct exfat_dentry *ep, | |
411 | unsigned char flags, unsigned int start_clu, | |
412 | unsigned long long size) | |
413 | { | |
414 | exfat_set_entry_type(ep, TYPE_STREAM); | |
415 | ep->dentry.stream.flags = flags; | |
416 | ep->dentry.stream.start_clu = cpu_to_le32(start_clu); | |
417 | ep->dentry.stream.valid_size = cpu_to_le64(size); | |
418 | ep->dentry.stream.size = cpu_to_le64(size); | |
419 | } | |
420 | ||
421 | static void exfat_init_name_entry(struct exfat_dentry *ep, | |
422 | unsigned short *uniname) | |
423 | { | |
424 | int i; | |
425 | ||
426 | exfat_set_entry_type(ep, TYPE_EXTEND); | |
427 | ep->dentry.name.flags = 0x0; | |
428 | ||
429 | for (i = 0; i < EXFAT_FILE_NAME_LEN; i++) { | |
4ba6ccd6 HK |
430 | if (*uniname != 0x0) { |
431 | ep->dentry.name.unicode_0_14[i] = cpu_to_le16(*uniname); | |
432 | uniname++; | |
433 | } else { | |
434 | ep->dentry.name.unicode_0_14[i] = 0x0; | |
435 | } | |
ca061973 NJ |
436 | } |
437 | } | |
438 | ||
439 | int exfat_init_dir_entry(struct inode *inode, struct exfat_chain *p_dir, | |
440 | int entry, unsigned int type, unsigned int start_clu, | |
441 | unsigned long long size) | |
442 | { | |
443 | struct super_block *sb = inode->i_sb; | |
444 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
445 | struct timespec64 ts = current_time(inode); | |
446 | sector_t sector; | |
447 | struct exfat_dentry *ep; | |
448 | struct buffer_head *bh; | |
449 | ||
450 | /* | |
451 | * We cannot use exfat_get_dentry_set here because file ep is not | |
452 | * initialized yet. | |
453 | */ | |
454 | ep = exfat_get_dentry(sb, p_dir, entry, &bh, §or); | |
455 | if (!ep) | |
456 | return -EIO; | |
457 | ||
458 | exfat_set_entry_type(ep, type); | |
459 | exfat_set_entry_time(sbi, &ts, | |
460 | &ep->dentry.file.create_tz, | |
461 | &ep->dentry.file.create_time, | |
462 | &ep->dentry.file.create_date, | |
ed0f84d3 | 463 | &ep->dentry.file.create_time_cs); |
ca061973 NJ |
464 | exfat_set_entry_time(sbi, &ts, |
465 | &ep->dentry.file.modify_tz, | |
466 | &ep->dentry.file.modify_time, | |
467 | &ep->dentry.file.modify_date, | |
ed0f84d3 | 468 | &ep->dentry.file.modify_time_cs); |
ca061973 NJ |
469 | exfat_set_entry_time(sbi, &ts, |
470 | &ep->dentry.file.access_tz, | |
471 | &ep->dentry.file.access_time, | |
472 | &ep->dentry.file.access_date, | |
473 | NULL); | |
474 | ||
2c7f8937 | 475 | exfat_update_bh(bh, IS_DIRSYNC(inode)); |
ca061973 NJ |
476 | brelse(bh); |
477 | ||
478 | ep = exfat_get_dentry(sb, p_dir, entry + 1, &bh, §or); | |
479 | if (!ep) | |
480 | return -EIO; | |
481 | ||
482 | exfat_init_stream_entry(ep, | |
483 | (type == TYPE_FILE) ? ALLOC_FAT_CHAIN : ALLOC_NO_FAT_CHAIN, | |
484 | start_clu, size); | |
2c7f8937 | 485 | exfat_update_bh(bh, IS_DIRSYNC(inode)); |
ca061973 NJ |
486 | brelse(bh); |
487 | ||
488 | return 0; | |
489 | } | |
490 | ||
491 | int exfat_update_dir_chksum(struct inode *inode, struct exfat_chain *p_dir, | |
492 | int entry) | |
493 | { | |
494 | struct super_block *sb = inode->i_sb; | |
495 | int ret = 0; | |
496 | int i, num_entries; | |
497 | sector_t sector; | |
5875bf28 | 498 | u16 chksum; |
ca061973 NJ |
499 | struct exfat_dentry *ep, *fep; |
500 | struct buffer_head *fbh, *bh; | |
501 | ||
502 | fep = exfat_get_dentry(sb, p_dir, entry, &fbh, §or); | |
503 | if (!fep) | |
504 | return -EIO; | |
505 | ||
506 | num_entries = fep->dentry.file.num_ext + 1; | |
5875bf28 | 507 | chksum = exfat_calc_chksum16(fep, DENTRY_SIZE, 0, CS_DIR_ENTRY); |
ca061973 NJ |
508 | |
509 | for (i = 1; i < num_entries; i++) { | |
510 | ep = exfat_get_dentry(sb, p_dir, entry + i, &bh, NULL); | |
511 | if (!ep) { | |
512 | ret = -EIO; | |
513 | goto release_fbh; | |
514 | } | |
5875bf28 | 515 | chksum = exfat_calc_chksum16(ep, DENTRY_SIZE, chksum, |
ca061973 NJ |
516 | CS_DEFAULT); |
517 | brelse(bh); | |
518 | } | |
519 | ||
520 | fep->dentry.file.checksum = cpu_to_le16(chksum); | |
2c7f8937 | 521 | exfat_update_bh(fbh, IS_DIRSYNC(inode)); |
ca061973 NJ |
522 | release_fbh: |
523 | brelse(fbh); | |
524 | return ret; | |
525 | } | |
526 | ||
527 | int exfat_init_ext_entry(struct inode *inode, struct exfat_chain *p_dir, | |
528 | int entry, int num_entries, struct exfat_uni_name *p_uniname) | |
529 | { | |
530 | struct super_block *sb = inode->i_sb; | |
531 | int i; | |
532 | sector_t sector; | |
533 | unsigned short *uniname = p_uniname->name; | |
534 | struct exfat_dentry *ep; | |
535 | struct buffer_head *bh; | |
536 | int sync = IS_DIRSYNC(inode); | |
537 | ||
538 | ep = exfat_get_dentry(sb, p_dir, entry, &bh, §or); | |
539 | if (!ep) | |
540 | return -EIO; | |
541 | ||
542 | ep->dentry.file.num_ext = (unsigned char)(num_entries - 1); | |
2c7f8937 | 543 | exfat_update_bh(bh, sync); |
ca061973 NJ |
544 | brelse(bh); |
545 | ||
546 | ep = exfat_get_dentry(sb, p_dir, entry + 1, &bh, §or); | |
547 | if (!ep) | |
548 | return -EIO; | |
549 | ||
550 | ep->dentry.stream.name_len = p_uniname->name_len; | |
551 | ep->dentry.stream.name_hash = cpu_to_le16(p_uniname->name_hash); | |
2c7f8937 | 552 | exfat_update_bh(bh, sync); |
ca061973 NJ |
553 | brelse(bh); |
554 | ||
555 | for (i = EXFAT_FIRST_CLUSTER; i < num_entries; i++) { | |
556 | ep = exfat_get_dentry(sb, p_dir, entry + i, &bh, §or); | |
557 | if (!ep) | |
558 | return -EIO; | |
559 | ||
560 | exfat_init_name_entry(ep, uniname); | |
2c7f8937 | 561 | exfat_update_bh(bh, sync); |
ca061973 NJ |
562 | brelse(bh); |
563 | uniname += EXFAT_FILE_NAME_LEN; | |
564 | } | |
565 | ||
566 | exfat_update_dir_chksum(inode, p_dir, entry); | |
567 | return 0; | |
568 | } | |
569 | ||
570 | int exfat_remove_entries(struct inode *inode, struct exfat_chain *p_dir, | |
571 | int entry, int order, int num_entries) | |
572 | { | |
573 | struct super_block *sb = inode->i_sb; | |
574 | int i; | |
575 | sector_t sector; | |
576 | struct exfat_dentry *ep; | |
577 | struct buffer_head *bh; | |
578 | ||
579 | for (i = order; i < num_entries; i++) { | |
580 | ep = exfat_get_dentry(sb, p_dir, entry + i, &bh, §or); | |
581 | if (!ep) | |
582 | return -EIO; | |
583 | ||
584 | exfat_set_entry_type(ep, TYPE_DELETED); | |
2c7f8937 | 585 | exfat_update_bh(bh, IS_DIRSYNC(inode)); |
ca061973 NJ |
586 | brelse(bh); |
587 | } | |
588 | ||
589 | return 0; | |
590 | } | |
591 | ||
943af1fd | 592 | void exfat_update_dir_chksum_with_entry_set(struct exfat_entry_set_cache *es) |
ca061973 | 593 | { |
943af1fd | 594 | int chksum_type = CS_DIR_ENTRY, i; |
ca061973 | 595 | unsigned short chksum = 0; |
943af1fd | 596 | struct exfat_dentry *ep; |
ca061973 | 597 | |
943af1fd TK |
598 | for (i = 0; i < es->num_entries; i++) { |
599 | ep = exfat_get_dentry_cached(es, i); | |
5875bf28 TK |
600 | chksum = exfat_calc_chksum16(ep, DENTRY_SIZE, chksum, |
601 | chksum_type); | |
ca061973 NJ |
602 | chksum_type = CS_DEFAULT; |
603 | } | |
943af1fd TK |
604 | ep = exfat_get_dentry_cached(es, 0); |
605 | ep->dentry.file.checksum = cpu_to_le16(chksum); | |
606 | es->modified = true; | |
607 | } | |
ca061973 | 608 | |
8b0c4717 | 609 | int exfat_free_dentry_set(struct exfat_entry_set_cache *es, int sync) |
943af1fd | 610 | { |
3db3c3fb | 611 | int i, err = 0; |
ca061973 | 612 | |
3db3c3fb TK |
613 | if (es->modified) |
614 | err = exfat_update_bhs(es->bh, es->num_bh, sync); | |
615 | ||
616 | for (i = 0; i < es->num_bh; i++) | |
617 | if (err) | |
618 | bforget(es->bh[i]); | |
619 | else | |
620 | brelse(es->bh[i]); | |
943af1fd | 621 | kfree(es); |
8b0c4717 | 622 | return err; |
ca061973 NJ |
623 | } |
624 | ||
625 | static int exfat_walk_fat_chain(struct super_block *sb, | |
626 | struct exfat_chain *p_dir, unsigned int byte_offset, | |
627 | unsigned int *clu) | |
628 | { | |
629 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
630 | unsigned int clu_offset; | |
631 | unsigned int cur_clu; | |
632 | ||
633 | clu_offset = EXFAT_B_TO_CLU(byte_offset, sbi); | |
634 | cur_clu = p_dir->dir; | |
635 | ||
636 | if (p_dir->flags == ALLOC_NO_FAT_CHAIN) { | |
637 | cur_clu += clu_offset; | |
638 | } else { | |
639 | while (clu_offset > 0) { | |
640 | if (exfat_get_next_cluster(sb, &cur_clu)) | |
641 | return -EIO; | |
642 | if (cur_clu == EXFAT_EOF_CLUSTER) { | |
643 | exfat_fs_error(sb, | |
644 | "invalid dentry access beyond EOF (clu : %u, eidx : %d)", | |
645 | p_dir->dir, | |
646 | EXFAT_B_TO_DEN(byte_offset)); | |
647 | return -EIO; | |
648 | } | |
649 | clu_offset--; | |
650 | } | |
651 | } | |
652 | ||
653 | *clu = cur_clu; | |
654 | return 0; | |
655 | } | |
656 | ||
657 | int exfat_find_location(struct super_block *sb, struct exfat_chain *p_dir, | |
658 | int entry, sector_t *sector, int *offset) | |
659 | { | |
660 | int ret; | |
661 | unsigned int off, clu = 0; | |
662 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
663 | ||
664 | off = EXFAT_DEN_TO_B(entry); | |
665 | ||
666 | ret = exfat_walk_fat_chain(sb, p_dir, off, &clu); | |
667 | if (ret) | |
668 | return ret; | |
669 | ||
670 | /* byte offset in cluster */ | |
671 | off = EXFAT_CLU_OFFSET(off, sbi); | |
672 | ||
673 | /* byte offset in sector */ | |
674 | *offset = EXFAT_BLK_OFFSET(off, sb); | |
675 | ||
676 | /* sector offset in cluster */ | |
677 | *sector = EXFAT_B_TO_BLK(off, sb); | |
678 | *sector += exfat_cluster_to_sector(sbi, clu); | |
679 | return 0; | |
680 | } | |
681 | ||
682 | #define EXFAT_MAX_RA_SIZE (128*1024) | |
683 | static int exfat_dir_readahead(struct super_block *sb, sector_t sec) | |
684 | { | |
685 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
686 | struct buffer_head *bh; | |
687 | unsigned int max_ra_count = EXFAT_MAX_RA_SIZE >> sb->s_blocksize_bits; | |
688 | unsigned int page_ra_count = PAGE_SIZE >> sb->s_blocksize_bits; | |
689 | unsigned int adj_ra_count = max(sbi->sect_per_clus, page_ra_count); | |
690 | unsigned int ra_count = min(adj_ra_count, max_ra_count); | |
691 | ||
692 | /* Read-ahead is not required */ | |
693 | if (sbi->sect_per_clus == 1) | |
694 | return 0; | |
695 | ||
696 | if (sec < sbi->data_start_sector) { | |
d1727d55 JP |
697 | exfat_err(sb, "requested sector is invalid(sect:%llu, root:%llu)", |
698 | (unsigned long long)sec, sbi->data_start_sector); | |
ca061973 NJ |
699 | return -EIO; |
700 | } | |
701 | ||
702 | /* Not sector aligned with ra_count, resize ra_count to page size */ | |
703 | if ((sec - sbi->data_start_sector) & (ra_count - 1)) | |
704 | ra_count = page_ra_count; | |
705 | ||
706 | bh = sb_find_get_block(sb, sec); | |
707 | if (!bh || !buffer_uptodate(bh)) { | |
708 | unsigned int i; | |
709 | ||
710 | for (i = 0; i < ra_count; i++) | |
711 | sb_breadahead(sb, (sector_t)(sec + i)); | |
712 | } | |
713 | brelse(bh); | |
714 | return 0; | |
715 | } | |
716 | ||
717 | struct exfat_dentry *exfat_get_dentry(struct super_block *sb, | |
718 | struct exfat_chain *p_dir, int entry, struct buffer_head **bh, | |
719 | sector_t *sector) | |
720 | { | |
721 | unsigned int dentries_per_page = EXFAT_B_TO_DEN(PAGE_SIZE); | |
722 | int off; | |
723 | sector_t sec; | |
724 | ||
725 | if (p_dir->dir == DIR_DELETED) { | |
d1727d55 | 726 | exfat_err(sb, "abnormal access to deleted dentry"); |
ca061973 NJ |
727 | return NULL; |
728 | } | |
729 | ||
730 | if (exfat_find_location(sb, p_dir, entry, &sec, &off)) | |
731 | return NULL; | |
732 | ||
733 | if (p_dir->dir != EXFAT_FREE_CLUSTER && | |
734 | !(entry & (dentries_per_page - 1))) | |
735 | exfat_dir_readahead(sb, sec); | |
736 | ||
737 | *bh = sb_bread(sb, sec); | |
738 | if (!*bh) | |
739 | return NULL; | |
740 | ||
741 | if (sector) | |
742 | *sector = sec; | |
743 | return (struct exfat_dentry *)((*bh)->b_data + off); | |
744 | } | |
745 | ||
746 | enum exfat_validate_dentry_mode { | |
747 | ES_MODE_STARTED, | |
748 | ES_MODE_GET_FILE_ENTRY, | |
749 | ES_MODE_GET_STRM_ENTRY, | |
750 | ES_MODE_GET_NAME_ENTRY, | |
751 | ES_MODE_GET_CRITICAL_SEC_ENTRY, | |
752 | }; | |
753 | ||
754 | static bool exfat_validate_entry(unsigned int type, | |
755 | enum exfat_validate_dentry_mode *mode) | |
756 | { | |
757 | if (type == TYPE_UNUSED || type == TYPE_DELETED) | |
758 | return false; | |
759 | ||
760 | switch (*mode) { | |
761 | case ES_MODE_STARTED: | |
762 | if (type != TYPE_FILE && type != TYPE_DIR) | |
763 | return false; | |
764 | *mode = ES_MODE_GET_FILE_ENTRY; | |
765 | return true; | |
766 | case ES_MODE_GET_FILE_ENTRY: | |
767 | if (type != TYPE_STREAM) | |
768 | return false; | |
769 | *mode = ES_MODE_GET_STRM_ENTRY; | |
770 | return true; | |
771 | case ES_MODE_GET_STRM_ENTRY: | |
772 | if (type != TYPE_EXTEND) | |
773 | return false; | |
774 | *mode = ES_MODE_GET_NAME_ENTRY; | |
775 | return true; | |
776 | case ES_MODE_GET_NAME_ENTRY: | |
777 | if (type == TYPE_STREAM) | |
778 | return false; | |
779 | if (type != TYPE_EXTEND) { | |
780 | if (!(type & TYPE_CRITICAL_SEC)) | |
781 | return false; | |
782 | *mode = ES_MODE_GET_CRITICAL_SEC_ENTRY; | |
783 | } | |
784 | return true; | |
785 | case ES_MODE_GET_CRITICAL_SEC_ENTRY: | |
786 | if (type == TYPE_EXTEND || type == TYPE_STREAM) | |
787 | return false; | |
788 | if ((type & TYPE_CRITICAL_SEC) != TYPE_CRITICAL_SEC) | |
789 | return false; | |
790 | return true; | |
791 | default: | |
792 | WARN_ON_ONCE(1); | |
793 | return false; | |
794 | } | |
795 | } | |
796 | ||
943af1fd TK |
797 | struct exfat_dentry *exfat_get_dentry_cached( |
798 | struct exfat_entry_set_cache *es, int num) | |
799 | { | |
800 | int off = es->start_off + num * DENTRY_SIZE; | |
801 | struct buffer_head *bh = es->bh[EXFAT_B_TO_BLK(off, es->sb)]; | |
802 | char *p = bh->b_data + EXFAT_BLK_OFFSET(off, es->sb); | |
803 | ||
804 | return (struct exfat_dentry *)p; | |
805 | } | |
806 | ||
ca061973 NJ |
807 | /* |
808 | * Returns a set of dentries for a file or dir. | |
809 | * | |
943af1fd TK |
810 | * Note It provides a direct pointer to bh->data via exfat_get_dentry_cached(). |
811 | * User should call exfat_get_dentry_set() after setting 'modified' to apply | |
812 | * changes made in this entry set to the real device. | |
ca061973 NJ |
813 | * |
814 | * in: | |
815 | * sb+p_dir+entry: indicates a file/dir | |
816 | * type: specifies how many dentries should be included. | |
ca061973 NJ |
817 | * return: |
818 | * pointer of entry set on success, | |
819 | * NULL on failure. | |
820 | */ | |
821 | struct exfat_entry_set_cache *exfat_get_dentry_set(struct super_block *sb, | |
943af1fd | 822 | struct exfat_chain *p_dir, int entry, unsigned int type) |
ca061973 | 823 | { |
943af1fd | 824 | int ret, i, num_bh; |
ca061973 | 825 | unsigned int off, byte_offset, clu = 0; |
ca061973 NJ |
826 | sector_t sec; |
827 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
828 | struct exfat_entry_set_cache *es; | |
943af1fd TK |
829 | struct exfat_dentry *ep; |
830 | int num_entries; | |
ca061973 NJ |
831 | enum exfat_validate_dentry_mode mode = ES_MODE_STARTED; |
832 | struct buffer_head *bh; | |
833 | ||
834 | if (p_dir->dir == DIR_DELETED) { | |
d1727d55 | 835 | exfat_err(sb, "access to deleted dentry"); |
ca061973 NJ |
836 | return NULL; |
837 | } | |
838 | ||
839 | byte_offset = EXFAT_DEN_TO_B(entry); | |
840 | ret = exfat_walk_fat_chain(sb, p_dir, byte_offset, &clu); | |
841 | if (ret) | |
842 | return NULL; | |
843 | ||
943af1fd TK |
844 | es = kzalloc(sizeof(*es), GFP_KERNEL); |
845 | if (!es) | |
846 | return NULL; | |
847 | es->sb = sb; | |
848 | es->modified = false; | |
849 | ||
ca061973 NJ |
850 | /* byte offset in cluster */ |
851 | byte_offset = EXFAT_CLU_OFFSET(byte_offset, sbi); | |
852 | ||
853 | /* byte offset in sector */ | |
854 | off = EXFAT_BLK_OFFSET(byte_offset, sb); | |
943af1fd | 855 | es->start_off = off; |
ca061973 NJ |
856 | |
857 | /* sector offset in cluster */ | |
858 | sec = EXFAT_B_TO_BLK(byte_offset, sb); | |
859 | sec += exfat_cluster_to_sector(sbi, clu); | |
860 | ||
861 | bh = sb_bread(sb, sec); | |
862 | if (!bh) | |
943af1fd TK |
863 | goto free_es; |
864 | es->bh[es->num_bh++] = bh; | |
ca061973 | 865 | |
943af1fd TK |
866 | ep = exfat_get_dentry_cached(es, 0); |
867 | if (!exfat_validate_entry(exfat_get_entry_type(ep), &mode)) | |
868 | goto free_es; | |
ca061973 NJ |
869 | |
870 | num_entries = type == ES_ALL_ENTRIES ? | |
871 | ep->dentry.file.num_ext + 1 : type; | |
ca061973 | 872 | es->num_entries = num_entries; |
ca061973 | 873 | |
943af1fd TK |
874 | num_bh = EXFAT_B_TO_BLK_ROUND_UP(off + num_entries * DENTRY_SIZE, sb); |
875 | for (i = 1; i < num_bh; i++) { | |
876 | /* get the next sector */ | |
877 | if (exfat_is_last_sector_in_cluster(sbi, sec)) { | |
878 | if (p_dir->flags == ALLOC_NO_FAT_CHAIN) | |
879 | clu++; | |
880 | else if (exfat_get_next_cluster(sb, &clu)) | |
ca061973 | 881 | goto free_es; |
943af1fd | 882 | sec = exfat_cluster_to_sector(sbi, clu); |
ca061973 | 883 | } else { |
943af1fd | 884 | sec++; |
ca061973 | 885 | } |
943af1fd TK |
886 | |
887 | bh = sb_bread(sb, sec); | |
888 | if (!bh) | |
889 | goto free_es; | |
890 | es->bh[es->num_bh++] = bh; | |
ca061973 NJ |
891 | } |
892 | ||
943af1fd TK |
893 | /* validiate cached dentries */ |
894 | for (i = 1; i < num_entries; i++) { | |
895 | ep = exfat_get_dentry_cached(es, i); | |
896 | if (!exfat_validate_entry(exfat_get_entry_type(ep), &mode)) | |
897 | goto free_es; | |
898 | } | |
ca061973 NJ |
899 | return es; |
900 | ||
901 | free_es: | |
943af1fd | 902 | exfat_free_dentry_set(es, false); |
ca061973 NJ |
903 | return NULL; |
904 | } | |
905 | ||
906 | enum { | |
907 | DIRENT_STEP_FILE, | |
908 | DIRENT_STEP_STRM, | |
909 | DIRENT_STEP_NAME, | |
910 | DIRENT_STEP_SECD, | |
911 | }; | |
912 | ||
913 | /* | |
c6e2f52e HK |
914 | * @ei: inode info of parent directory |
915 | * @p_dir: directory structure of parent directory | |
916 | * @num_entries:entry size of p_uniname | |
917 | * @hint_opt: If p_uniname is found, filled with optimized dir/entry | |
918 | * for traversing cluster chain. | |
919 | * @return: | |
920 | * >= 0: file directory entry position where the name exists | |
921 | * -ENOENT: entry with the name does not exist | |
922 | * -EIO: I/O error | |
ca061973 NJ |
923 | */ |
924 | int exfat_find_dir_entry(struct super_block *sb, struct exfat_inode_info *ei, | |
925 | struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname, | |
c6e2f52e | 926 | int num_entries, unsigned int type, struct exfat_hint *hint_opt) |
ca061973 NJ |
927 | { |
928 | int i, rewind = 0, dentry = 0, end_eidx = 0, num_ext = 0, len; | |
929 | int order, step, name_len = 0; | |
930 | int dentries_per_clu, num_empty = 0; | |
931 | unsigned int entry_type; | |
932 | unsigned short *uniname = NULL; | |
933 | struct exfat_chain clu; | |
934 | struct exfat_hint *hint_stat = &ei->hint_stat; | |
935 | struct exfat_hint_femp candi_empty; | |
936 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
937 | ||
938 | dentries_per_clu = sbi->dentries_per_clu; | |
939 | ||
940 | exfat_chain_dup(&clu, p_dir); | |
941 | ||
942 | if (hint_stat->eidx) { | |
943 | clu.dir = hint_stat->clu; | |
944 | dentry = hint_stat->eidx; | |
945 | end_eidx = dentry; | |
946 | } | |
947 | ||
948 | candi_empty.eidx = EXFAT_HINT_NONE; | |
949 | rewind: | |
950 | order = 0; | |
951 | step = DIRENT_STEP_FILE; | |
952 | while (clu.dir != EXFAT_EOF_CLUSTER) { | |
953 | i = dentry & (dentries_per_clu - 1); | |
954 | for (; i < dentries_per_clu; i++, dentry++) { | |
955 | struct exfat_dentry *ep; | |
956 | struct buffer_head *bh; | |
957 | ||
958 | if (rewind && dentry == end_eidx) | |
959 | goto not_found; | |
960 | ||
961 | ep = exfat_get_dentry(sb, &clu, i, &bh, NULL); | |
962 | if (!ep) | |
963 | return -EIO; | |
964 | ||
965 | entry_type = exfat_get_entry_type(ep); | |
966 | ||
967 | if (entry_type == TYPE_UNUSED || | |
968 | entry_type == TYPE_DELETED) { | |
969 | step = DIRENT_STEP_FILE; | |
970 | ||
971 | num_empty++; | |
972 | if (candi_empty.eidx == EXFAT_HINT_NONE && | |
973 | num_empty == 1) { | |
974 | exfat_chain_set(&candi_empty.cur, | |
975 | clu.dir, clu.size, clu.flags); | |
976 | } | |
977 | ||
978 | if (candi_empty.eidx == EXFAT_HINT_NONE && | |
979 | num_empty >= num_entries) { | |
980 | candi_empty.eidx = | |
981 | dentry - (num_empty - 1); | |
982 | WARN_ON(candi_empty.eidx < 0); | |
983 | candi_empty.count = num_empty; | |
984 | ||
985 | if (ei->hint_femp.eidx == | |
986 | EXFAT_HINT_NONE || | |
987 | candi_empty.eidx <= | |
a7a24168 TK |
988 | ei->hint_femp.eidx) |
989 | ei->hint_femp = candi_empty; | |
ca061973 NJ |
990 | } |
991 | ||
992 | brelse(bh); | |
993 | if (entry_type == TYPE_UNUSED) | |
994 | goto not_found; | |
995 | continue; | |
996 | } | |
997 | ||
998 | num_empty = 0; | |
999 | candi_empty.eidx = EXFAT_HINT_NONE; | |
1000 | ||
1001 | if (entry_type == TYPE_FILE || entry_type == TYPE_DIR) { | |
1002 | step = DIRENT_STEP_FILE; | |
c6e2f52e HK |
1003 | hint_opt->clu = clu.dir; |
1004 | hint_opt->eidx = i; | |
ca061973 NJ |
1005 | if (type == TYPE_ALL || type == entry_type) { |
1006 | num_ext = ep->dentry.file.num_ext; | |
1007 | step = DIRENT_STEP_STRM; | |
1008 | } | |
1009 | brelse(bh); | |
1010 | continue; | |
1011 | } | |
1012 | ||
1013 | if (entry_type == TYPE_STREAM) { | |
5875bf28 | 1014 | u16 name_hash; |
ca061973 NJ |
1015 | |
1016 | if (step != DIRENT_STEP_STRM) { | |
1017 | step = DIRENT_STEP_FILE; | |
1018 | brelse(bh); | |
1019 | continue; | |
1020 | } | |
1021 | step = DIRENT_STEP_FILE; | |
1022 | name_hash = le16_to_cpu( | |
1023 | ep->dentry.stream.name_hash); | |
1024 | if (p_uniname->name_hash == name_hash && | |
1025 | p_uniname->name_len == | |
1026 | ep->dentry.stream.name_len) { | |
1027 | step = DIRENT_STEP_NAME; | |
1028 | order = 1; | |
1029 | name_len = 0; | |
1030 | } | |
1031 | brelse(bh); | |
1032 | continue; | |
1033 | } | |
1034 | ||
1035 | brelse(bh); | |
1036 | if (entry_type == TYPE_EXTEND) { | |
1037 | unsigned short entry_uniname[16], unichar; | |
1038 | ||
1039 | if (step != DIRENT_STEP_NAME) { | |
1040 | step = DIRENT_STEP_FILE; | |
1041 | continue; | |
1042 | } | |
1043 | ||
1044 | if (++order == 2) | |
1045 | uniname = p_uniname->name; | |
1046 | else | |
1047 | uniname += EXFAT_FILE_NAME_LEN; | |
1048 | ||
1049 | len = exfat_extract_uni_name(ep, entry_uniname); | |
1050 | name_len += len; | |
1051 | ||
1052 | unichar = *(uniname+len); | |
1053 | *(uniname+len) = 0x0; | |
1054 | ||
1055 | if (exfat_uniname_ncmp(sb, uniname, | |
1056 | entry_uniname, len)) { | |
1057 | step = DIRENT_STEP_FILE; | |
1058 | } else if (p_uniname->name_len == name_len) { | |
1059 | if (order == num_ext) | |
1060 | goto found; | |
1061 | step = DIRENT_STEP_SECD; | |
1062 | } | |
1063 | ||
1064 | *(uniname+len) = unichar; | |
1065 | continue; | |
1066 | } | |
1067 | ||
1068 | if (entry_type & | |
1069 | (TYPE_CRITICAL_SEC | TYPE_BENIGN_SEC)) { | |
1070 | if (step == DIRENT_STEP_SECD) { | |
1071 | if (++order == num_ext) | |
1072 | goto found; | |
1073 | continue; | |
1074 | } | |
1075 | } | |
1076 | step = DIRENT_STEP_FILE; | |
1077 | } | |
1078 | ||
1079 | if (clu.flags == ALLOC_NO_FAT_CHAIN) { | |
1080 | if (--clu.size > 0) | |
1081 | clu.dir++; | |
1082 | else | |
1083 | clu.dir = EXFAT_EOF_CLUSTER; | |
1084 | } else { | |
1085 | if (exfat_get_next_cluster(sb, &clu.dir)) | |
1086 | return -EIO; | |
1087 | } | |
1088 | } | |
1089 | ||
1090 | not_found: | |
1091 | /* | |
1092 | * We started at not 0 index,so we should try to find target | |
1093 | * from 0 index to the index we started at. | |
1094 | */ | |
1095 | if (!rewind && end_eidx) { | |
1096 | rewind = 1; | |
1097 | dentry = 0; | |
1098 | clu.dir = p_dir->dir; | |
1099 | /* reset empty hint */ | |
1100 | num_empty = 0; | |
1101 | candi_empty.eidx = EXFAT_HINT_NONE; | |
1102 | goto rewind; | |
1103 | } | |
1104 | ||
1105 | /* initialized hint_stat */ | |
1106 | hint_stat->clu = p_dir->dir; | |
1107 | hint_stat->eidx = 0; | |
1108 | return -ENOENT; | |
1109 | ||
1110 | found: | |
1111 | /* next dentry we'll find is out of this cluster */ | |
1112 | if (!((dentry + 1) & (dentries_per_clu - 1))) { | |
1113 | int ret = 0; | |
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 | ret = exfat_get_next_cluster(sb, &clu.dir); | |
1122 | } | |
1123 | ||
d2fa0c33 | 1124 | if (ret || clu.dir == EXFAT_EOF_CLUSTER) { |
ca061973 NJ |
1125 | /* just initialized hint_stat */ |
1126 | hint_stat->clu = p_dir->dir; | |
1127 | hint_stat->eidx = 0; | |
1128 | return (dentry - num_ext); | |
1129 | } | |
1130 | } | |
1131 | ||
1132 | hint_stat->clu = clu.dir; | |
1133 | hint_stat->eidx = dentry + 1; | |
1134 | return dentry - num_ext; | |
1135 | } | |
1136 | ||
1137 | int exfat_count_ext_entries(struct super_block *sb, struct exfat_chain *p_dir, | |
1138 | int entry, struct exfat_dentry *ep) | |
1139 | { | |
1140 | int i, count = 0; | |
1141 | unsigned int type; | |
1142 | struct exfat_dentry *ext_ep; | |
1143 | struct buffer_head *bh; | |
1144 | ||
1145 | for (i = 0, entry++; i < ep->dentry.file.num_ext; i++, entry++) { | |
1146 | ext_ep = exfat_get_dentry(sb, p_dir, entry, &bh, NULL); | |
1147 | if (!ext_ep) | |
1148 | return -EIO; | |
1149 | ||
1150 | type = exfat_get_entry_type(ext_ep); | |
1151 | brelse(bh); | |
1152 | if (type == TYPE_EXTEND || type == TYPE_STREAM) | |
1153 | count++; | |
1154 | else | |
1155 | break; | |
1156 | } | |
1157 | return count; | |
1158 | } | |
1159 | ||
1160 | int exfat_count_dir_entries(struct super_block *sb, struct exfat_chain *p_dir) | |
1161 | { | |
1162 | int i, count = 0; | |
1163 | int dentries_per_clu; | |
1164 | unsigned int entry_type; | |
1165 | struct exfat_chain clu; | |
1166 | struct exfat_dentry *ep; | |
1167 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
1168 | struct buffer_head *bh; | |
1169 | ||
1170 | dentries_per_clu = sbi->dentries_per_clu; | |
1171 | ||
1172 | exfat_chain_dup(&clu, p_dir); | |
1173 | ||
1174 | while (clu.dir != EXFAT_EOF_CLUSTER) { | |
1175 | for (i = 0; i < dentries_per_clu; i++) { | |
1176 | ep = exfat_get_dentry(sb, &clu, i, &bh, NULL); | |
1177 | if (!ep) | |
1178 | return -EIO; | |
1179 | entry_type = exfat_get_entry_type(ep); | |
1180 | brelse(bh); | |
1181 | ||
1182 | if (entry_type == TYPE_UNUSED) | |
1183 | return count; | |
1184 | if (entry_type != TYPE_DIR) | |
1185 | continue; | |
1186 | count++; | |
1187 | } | |
1188 | ||
1189 | if (clu.flags == ALLOC_NO_FAT_CHAIN) { | |
1190 | if (--clu.size > 0) | |
1191 | clu.dir++; | |
1192 | else | |
1193 | clu.dir = EXFAT_EOF_CLUSTER; | |
1194 | } else { | |
1195 | if (exfat_get_next_cluster(sb, &(clu.dir))) | |
1196 | return -EIO; | |
1197 | } | |
1198 | } | |
1199 | ||
1200 | return count; | |
1201 | } |