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exfat: move free cluster out of exfat_init_ext_entry()
[linux-block.git] / fs / exfat / dir.c
CommitLineData
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
14static 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
8258ef28 32static int exfat_get_uniname_from_ext_entry(struct super_block *sb,
ca061973
NJ		 33 struct exfat_chain *p_dir, int entry, unsigned short *uniname)
34{
8258ef28 35 int i, err;
20914ff6 36 struct exfat_entry_set_cache es;
d4233457 37 unsigned int uni_len = 0, len;
ca061973 38
8258ef28
NJ		 39 err = exfat_get_dentry_set(&es, sb, p_dir, entry, ES_ALL_ENTRIES);
40 if (err)
41 return err;
ca061973 42
ca061973
NJ		 43 /*
44 * First entry : file entry
45 * Second entry : stream-extension entry
46 * Third entry : first file-name entry
47 * So, the index of first file-name dentry should start from 2.
48 */
f3fe3954 49 for (i = ES_IDX_FIRST_FILENAME; i < es.num_entries; i++) {
20914ff6 50 struct exfat_dentry *ep = exfat_get_dentry_cached(&es, i);
943af1fd 51
ca061973
NJ		 52 /* end of name entry */
53 if (exfat_get_entry_type(ep) != TYPE_EXTEND)
943af1fd 54 break;
ca061973 55
d4233457
NJ		 56 len = exfat_extract_uni_name(ep, uniname);
57 uni_len += len;
58 if (len != EXFAT_FILE_NAME_LEN || uni_len >= MAX_NAME_LENGTH)
59 break;
ca061973
NJ		 60 uniname += EXFAT_FILE_NAME_LEN;
61 }
62
3b9681ac 63 exfat_put_dentry_set(&es, false);
8258ef28 64 return 0;
ca061973
NJ		 65}
66
67/* read a directory entry from the opened directory */
04cee52f 68static int exfat_readdir(struct inode *inode, loff_t *cpos, struct exfat_dir_entry *dir_entry)
ca061973 69{
8258ef28 70 int i, dentries_per_clu, num_ext, err;
1e5654de 71 unsigned int type, clu_offset, max_dentries;
ca061973
NJ		 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);
04cee52f 78 unsigned int dentry = EXFAT_B_TO_DEN(*cpos) & 0xFFFFFFFF;
ca061973
NJ		 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;
1e5654de 92 max_dentries = (unsigned int)min_t(u64, MAX_EXFAT_DENTRIES,
088f1343 93 (u64)EXFAT_CLU_TO_DEN(sbi->num_clusters, sbi));
ca061973 94
088f1343 95 clu_offset = EXFAT_DEN_TO_CLU(dentry, sbi);
ca061973
NJ		 96 exfat_chain_dup(&clu, &dir);
97
98 if (clu.flags == ALLOC_NO_FAT_CHAIN) {
99 clu.dir += clu_offset;
100 clu.size -= clu_offset;
101 } else {
102 /* hint_information */
103 if (clu_offset > 0 && ei->hint_bmap.off != EXFAT_EOF_CLUSTER &&
104 ei->hint_bmap.off > 0 && clu_offset >= ei->hint_bmap.off) {
105 clu_offset -= ei->hint_bmap.off;
106 clu.dir = ei->hint_bmap.clu;
107 }
108
706fdcac 109 while (clu_offset > 0 && clu.dir != EXFAT_EOF_CLUSTER) {
ca061973
NJ		 110 if (exfat_get_next_cluster(sb, &(clu.dir)))
111 return -EIO;
112
113 clu_offset--;
114 }
115 }
116
1e5654de 117 while (clu.dir != EXFAT_EOF_CLUSTER && dentry < max_dentries) {
ca061973
NJ		 118 i = dentry & (dentries_per_clu - 1);
119
120 for ( ; i < dentries_per_clu; i++, dentry++) {
c71510b3 121 ep = exfat_get_dentry(sb, &clu, i, &bh);
ca061973
NJ		 122 if (!ep)
123 return -EIO;
124
125 type = exfat_get_entry_type(ep);
126 if (type == TYPE_UNUSED) {
127 brelse(bh);
128 break;
129 }
130
131 if (type != TYPE_FILE && type != TYPE_DIR) {
132 brelse(bh);
133 continue;
134 }
135
04cee52f 136 num_ext = ep->dentry.file.num_ext;
ca061973
NJ		 137 dir_entry->attr = le16_to_cpu(ep->dentry.file.attr);
138 exfat_get_entry_time(sbi, &dir_entry->crtime,
139 ep->dentry.file.create_tz,
140 ep->dentry.file.create_time,
141 ep->dentry.file.create_date,
ed0f84d3 142 ep->dentry.file.create_time_cs);
ca061973
NJ		 143 exfat_get_entry_time(sbi, &dir_entry->mtime,
144 ep->dentry.file.modify_tz,
145 ep->dentry.file.modify_time,
146 ep->dentry.file.modify_date,
ed0f84d3 147 ep->dentry.file.modify_time_cs);
ca061973
NJ		 148 exfat_get_entry_time(sbi, &dir_entry->atime,
149 ep->dentry.file.access_tz,
150 ep->dentry.file.access_time,
151 ep->dentry.file.access_date,
152 0);
153
154 *uni_name.name = 0x0;
8258ef28 155 err = exfat_get_uniname_from_ext_entry(sb, &clu, i,
ca061973 156 uni_name.name);
8258ef28
NJ		 157 if (err) {
158 brelse(bh);
159 continue;
160 }
ca061973
NJ		 161 exfat_utf16_to_nls(sb, &uni_name,
162 dir_entry->namebuf.lfn,
163 dir_entry->namebuf.lfnbuf_len);
164 brelse(bh);
165
c71510b3 166 ep = exfat_get_dentry(sb, &clu, i + 1, &bh);
ca061973
NJ		 167 if (!ep)
168 return -EIO;
169 dir_entry->size =
170 le64_to_cpu(ep->dentry.stream.valid_size);
04cee52f 171 dir_entry->entry = dentry;
ca061973
NJ		 172 brelse(bh);
173
088f1343 174 ei->hint_bmap.off = EXFAT_DEN_TO_CLU(dentry, sbi);
ca061973
NJ		 175 ei->hint_bmap.clu = clu.dir;
176
04cee52f 177 *cpos = EXFAT_DEN_TO_B(dentry + 1 + num_ext);
ca061973
NJ		 178 return 0;
179 }
180
181 if (clu.flags == ALLOC_NO_FAT_CHAIN) {
182 if (--clu.size > 0)
183 clu.dir++;
184 else
185 clu.dir = EXFAT_EOF_CLUSTER;
186 } else {
187 if (exfat_get_next_cluster(sb, &(clu.dir)))
188 return -EIO;
189 }
190 }
191
192 dir_entry->namebuf.lfn[0] = '\0';
04cee52f 193 *cpos = EXFAT_DEN_TO_B(dentry);
ca061973
NJ		 194 return 0;
195}
196
197static void exfat_init_namebuf(struct exfat_dentry_namebuf *nb)
198{
199 nb->lfn = NULL;
200 nb->lfnbuf_len = 0;
201}
202
203static int exfat_alloc_namebuf(struct exfat_dentry_namebuf *nb)
204{
205 nb->lfn = __getname();
206 if (!nb->lfn)
207 return -ENOMEM;
208 nb->lfnbuf_len = MAX_VFSNAME_BUF_SIZE;
209 return 0;
210}
211
212static void exfat_free_namebuf(struct exfat_dentry_namebuf *nb)
213{
214 if (!nb->lfn)
215 return;
216
217 __putname(nb->lfn);
218 exfat_init_namebuf(nb);
219}
220
ff84772f
SS		 221/*
222 * Before calling dir_emit*(), sbi->s_lock should be released
223 * because page fault can occur in dir_emit*().
224 */
ca061973 225#define ITER_POS_FILLED_DOTS (2)
703e3e9a 226static int exfat_iterate(struct file *file, struct dir_context *ctx)
ca061973 227{
703e3e9a 228 struct inode *inode = file_inode(file);
ca061973
NJ		 229 struct super_block *sb = inode->i_sb;
230 struct inode *tmp;
231 struct exfat_dir_entry de;
232 struct exfat_dentry_namebuf *nb = &(de.namebuf);
233 struct exfat_inode_info *ei = EXFAT_I(inode);
234 unsigned long inum;
235 loff_t cpos, i_pos;
236 int err = 0, fake_offset = 0;
237
238 exfat_init_namebuf(nb);
ca061973
NJ		 239
240 cpos = ctx->pos;
703e3e9a 241 if (!dir_emit_dots(file, ctx))
ff84772f 242 goto out;
ca061973
NJ		 243
244 if (ctx->pos == ITER_POS_FILLED_DOTS) {
245 cpos = 0;
246 fake_offset = 1;
247 }
248
6cb5d1a1 249 cpos = round_up(cpos, DENTRY_SIZE);
ca061973
NJ		 250
251 /* name buffer should be allocated before use */
252 err = exfat_alloc_namebuf(nb);
253 if (err)
ff84772f 254 goto out;
ca061973 255get_new:
ff84772f
SS		 256 mutex_lock(&EXFAT_SB(sb)->s_lock);
257
1e5654de 258 if (ei->flags == ALLOC_NO_FAT_CHAIN && cpos >= i_size_read(inode))
ca061973
NJ		 259 goto end_of_dir;
260
04cee52f 261 err = exfat_readdir(inode, &cpos, &de);
ca061973
NJ		 262 if (err) {
263 /*
ff84772f
SS		 264 * At least we tried to read a sector.
265 * Move cpos to next sector position (should be aligned).
ca061973
NJ		 266 */
267 if (err == -EIO) {
268 cpos += 1 << (sb->s_blocksize_bits);
269 cpos &= ~(sb->s_blocksize - 1);
270 }
271
272 err = -EIO;
273 goto end_of_dir;
274 }
275
ca061973
NJ		 276 if (!nb->lfn[0])
277 goto end_of_dir;
278
04cee52f 279 i_pos = ((loff_t)ei->start_clu << 32) | (de.entry & 0xffffffff);
ca061973
NJ		 280 tmp = exfat_iget(sb, i_pos);
281 if (tmp) {
282 inum = tmp->i_ino;
283 iput(tmp);
284 } else {
285 inum = iunique(sb, EXFAT_ROOT_INO);
286 }
287
ca061973
NJ		 288 mutex_unlock(&EXFAT_SB(sb)->s_lock);
289 if (!dir_emit(ctx, nb->lfn, strlen(nb->lfn), inum,
0ab8ba71 290 (de.attr & EXFAT_ATTR_SUBDIR) ? DT_DIR : DT_REG))
ff84772f 291 goto out;
ca061973
NJ		 292 ctx->pos = cpos;
293 goto get_new;
294
295end_of_dir:
296 if (!cpos && fake_offset)
297 cpos = ITER_POS_FILLED_DOTS;
298 ctx->pos = cpos;
ca061973 299 mutex_unlock(&EXFAT_SB(sb)->s_lock);
ff84772f 300out:
ca061973
NJ		 301 /*
302 * To improve performance, free namebuf after unlock sb_lock.
303 * If namebuf is not allocated, this function do nothing
304 */
305 exfat_free_namebuf(nb);
306 return err;
307}
308
3e327154 309WRAP_DIR_ITER(exfat_iterate) // FIXME!
ca061973
NJ		 310const struct file_operations exfat_dir_operations = {
311 .llseek = generic_file_llseek,
312 .read = generic_read_dir,
3e327154 313 .iterate_shared = shared_exfat_iterate,
654762df
HK		 314 .unlocked_ioctl = exfat_ioctl,
315#ifdef CONFIG_COMPAT
316 .compat_ioctl = exfat_compat_ioctl,
317#endif
5267456e 318 .fsync = exfat_file_fsync,
ca061973
NJ		 319};
320
321int exfat_alloc_new_dir(struct inode *inode, struct exfat_chain *clu)
322{
323 int ret;
324
325 exfat_chain_set(clu, EXFAT_EOF_CLUSTER, 0, ALLOC_NO_FAT_CHAIN);
326
23befe49 327 ret = exfat_alloc_cluster(inode, 1, clu, IS_DIRSYNC(inode));
ca061973
NJ		 328 if (ret)
329 return ret;
330
331 return exfat_zeroed_cluster(inode, clu->dir);
332}
333
334int exfat_calc_num_entries(struct exfat_uni_name *p_uniname)
335{
336 int len;
337
338 len = p_uniname->name_len;
339 if (len == 0)
340 return -EINVAL;
341
342 /* 1 file entry + 1 stream entry + name entries */
f3fe3954 343 return ES_ENTRY_NUM(len);
ca061973
NJ		 344}
345
346unsigned int exfat_get_entry_type(struct exfat_dentry *ep)
347{
348 if (ep->type == EXFAT_UNUSED)
349 return TYPE_UNUSED;
350 if (IS_EXFAT_DELETED(ep->type))
351 return TYPE_DELETED;
352 if (ep->type == EXFAT_INVAL)
353 return TYPE_INVALID;
354 if (IS_EXFAT_CRITICAL_PRI(ep->type)) {
355 if (ep->type == EXFAT_BITMAP)
356 return TYPE_BITMAP;
357 if (ep->type == EXFAT_UPCASE)
358 return TYPE_UPCASE;
359 if (ep->type == EXFAT_VOLUME)
360 return TYPE_VOLUME;
361 if (ep->type == EXFAT_FILE) {
0ab8ba71 362 if (le16_to_cpu(ep->dentry.file.attr) & EXFAT_ATTR_SUBDIR)
ca061973
NJ		 363 return TYPE_DIR;
364 return TYPE_FILE;
365 }
366 return TYPE_CRITICAL_PRI;
367 }
368 if (IS_EXFAT_BENIGN_PRI(ep->type)) {
369 if (ep->type == EXFAT_GUID)
370 return TYPE_GUID;
371 if (ep->type == EXFAT_PADDING)
372 return TYPE_PADDING;
373 if (ep->type == EXFAT_ACLTAB)
374 return TYPE_ACLTAB;
375 return TYPE_BENIGN_PRI;
376 }
377 if (IS_EXFAT_CRITICAL_SEC(ep->type)) {
378 if (ep->type == EXFAT_STREAM)
379 return TYPE_STREAM;
380 if (ep->type == EXFAT_NAME)
381 return TYPE_EXTEND;
382 if (ep->type == EXFAT_ACL)
383 return TYPE_ACL;
384 return TYPE_CRITICAL_SEC;
385 }
8258ef28
NJ		 386
387 if (ep->type == EXFAT_VENDOR_EXT)
388 return TYPE_VENDOR_EXT;
389 if (ep->type == EXFAT_VENDOR_ALLOC)
390 return TYPE_VENDOR_ALLOC;
391
ca061973
NJ		 392 return TYPE_BENIGN_SEC;
393}
394
395static void exfat_set_entry_type(struct exfat_dentry *ep, unsigned int type)
396{
397 if (type == TYPE_UNUSED) {
398 ep->type = EXFAT_UNUSED;
399 } else if (type == TYPE_DELETED) {
400 ep->type &= EXFAT_DELETE;
401 } else if (type == TYPE_STREAM) {
402 ep->type = EXFAT_STREAM;
403 } else if (type == TYPE_EXTEND) {
404 ep->type = EXFAT_NAME;
405 } else if (type == TYPE_BITMAP) {
406 ep->type = EXFAT_BITMAP;
407 } else if (type == TYPE_UPCASE) {
408 ep->type = EXFAT_UPCASE;
409 } else if (type == TYPE_VOLUME) {
410 ep->type = EXFAT_VOLUME;
411 } else if (type == TYPE_DIR) {
412 ep->type = EXFAT_FILE;
0ab8ba71 413 ep->dentry.file.attr = cpu_to_le16(EXFAT_ATTR_SUBDIR);
ca061973
NJ		 414 } else if (type == TYPE_FILE) {
415 ep->type = EXFAT_FILE;
0ab8ba71 416 ep->dentry.file.attr = cpu_to_le16(EXFAT_ATTR_ARCHIVE);
ca061973
NJ		 417 }
418}
419
420static void exfat_init_stream_entry(struct exfat_dentry *ep,
ee785c15 421 unsigned int start_clu, unsigned long long size)
ca061973
NJ		 422{
423 exfat_set_entry_type(ep, TYPE_STREAM);
ee785c15
YM		 424 if (size == 0)
425 ep->dentry.stream.flags = ALLOC_FAT_CHAIN;
426 else
427 ep->dentry.stream.flags = ALLOC_NO_FAT_CHAIN;
ca061973
NJ		 428 ep->dentry.stream.start_clu = cpu_to_le32(start_clu);
429 ep->dentry.stream.valid_size = cpu_to_le64(size);
430 ep->dentry.stream.size = cpu_to_le64(size);
431}
432
433static void exfat_init_name_entry(struct exfat_dentry *ep,
434 unsigned short *uniname)
435{
436 int i;
437
438 exfat_set_entry_type(ep, TYPE_EXTEND);
439 ep->dentry.name.flags = 0x0;
440
441 for (i = 0; i < EXFAT_FILE_NAME_LEN; i++) {
4ba6ccd6
HK		 442 if (*uniname != 0x0) {
443 ep->dentry.name.unicode_0_14[i] = cpu_to_le16(*uniname);
444 uniname++;
445 } else {
446 ep->dentry.name.unicode_0_14[i] = 0x0;
447 }
ca061973
NJ		 448 }
449}
450
cf8663fa
YM		 451void exfat_init_dir_entry(struct exfat_entry_set_cache *es,
452 unsigned int type, unsigned int start_clu,
453 unsigned long long size, struct timespec64 *ts)
ca061973 454{
cf8663fa 455 struct super_block *sb = es->sb;
ca061973 456 struct exfat_sb_info *sbi = EXFAT_SB(sb);
ca061973 457 struct exfat_dentry *ep;
ca061973 458
cf8663fa 459 ep = exfat_get_dentry_cached(es, ES_IDX_FILE);
ca061973 460 exfat_set_entry_type(ep, type);
cf8663fa 461 exfat_set_entry_time(sbi, ts,
ca061973
NJ		 462 &ep->dentry.file.create_tz,
463 &ep->dentry.file.create_time,
464 &ep->dentry.file.create_date,
ed0f84d3 465 &ep->dentry.file.create_time_cs);
cf8663fa 466 exfat_set_entry_time(sbi, ts,
ca061973
NJ		 467 &ep->dentry.file.modify_tz,
468 &ep->dentry.file.modify_time,
469 &ep->dentry.file.modify_date,
ed0f84d3 470 &ep->dentry.file.modify_time_cs);
cf8663fa 471 exfat_set_entry_time(sbi, ts,
ca061973
NJ		 472 &ep->dentry.file.access_tz,
473 &ep->dentry.file.access_time,
474 &ep->dentry.file.access_date,
475 NULL);
476
cf8663fa 477 ep = exfat_get_dentry_cached(es, ES_IDX_STREAM);
ee785c15 478 exfat_init_stream_entry(ep, start_clu, size);
ca061973
NJ		 479}
480
481int exfat_update_dir_chksum(struct inode *inode, struct exfat_chain *p_dir,
482 int entry)
483{
484 struct super_block *sb = inode->i_sb;
485 int ret = 0;
486 int i, num_entries;
5875bf28 487 u16 chksum;
ca061973
NJ		 488 struct exfat_dentry *ep, *fep;
489 struct buffer_head *fbh, *bh;
490
c71510b3 491 fep = exfat_get_dentry(sb, p_dir, entry, &fbh);
ca061973
NJ		 492 if (!fep)
493 return -EIO;
494
495 num_entries = fep->dentry.file.num_ext + 1;
5875bf28 496 chksum = exfat_calc_chksum16(fep, DENTRY_SIZE, 0, CS_DIR_ENTRY);
ca061973
NJ		 497
498 for (i = 1; i < num_entries; i++) {
c71510b3 499 ep = exfat_get_dentry(sb, p_dir, entry + i, &bh);
ca061973
NJ		 500 if (!ep) {
501 ret = -EIO;
502 goto release_fbh;
503 }
5875bf28 504 chksum = exfat_calc_chksum16(ep, DENTRY_SIZE, chksum,
ca061973
NJ		 505 CS_DEFAULT);
506 brelse(bh);
507 }
508
509 fep->dentry.file.checksum = cpu_to_le16(chksum);
2c7f8937 510 exfat_update_bh(fbh, IS_DIRSYNC(inode));
ca061973
NJ		 511release_fbh:
512 brelse(fbh);
513 return ret;
514}
515
8258ef28
NJ		 516static void exfat_free_benign_secondary_clusters(struct inode *inode,
517 struct exfat_dentry *ep)
518{
519 struct super_block *sb = inode->i_sb;
520 struct exfat_chain dir;
521 unsigned int start_clu =
522 le32_to_cpu(ep->dentry.generic_secondary.start_clu);
523 u64 size = le64_to_cpu(ep->dentry.generic_secondary.size);
524 unsigned char flags = ep->dentry.generic_secondary.flags;
525
526 if (!(flags & ALLOC_POSSIBLE) || !start_clu || !size)
527 return;
528
529 exfat_chain_set(&dir, start_clu,
530 EXFAT_B_TO_CLU_ROUND_UP(size, EXFAT_SB(sb)),
531 flags);
532 exfat_free_cluster(inode, &dir);
533}
534
ca061973
NJ		 535int exfat_init_ext_entry(struct inode *inode, struct exfat_chain *p_dir,
536 int entry, int num_entries, struct exfat_uni_name *p_uniname)
537{
538 struct super_block *sb = inode->i_sb;
539 int i;
ca061973
NJ		 540 unsigned short *uniname = p_uniname->name;
541 struct exfat_dentry *ep;
542 struct buffer_head *bh;
543 int sync = IS_DIRSYNC(inode);
544
c71510b3 545 ep = exfat_get_dentry(sb, p_dir, entry, &bh);
ca061973
NJ		 546 if (!ep)
547 return -EIO;
548
549 ep->dentry.file.num_ext = (unsigned char)(num_entries - 1);
2c7f8937 550 exfat_update_bh(bh, sync);
ca061973
NJ		 551 brelse(bh);
552
c71510b3 553 ep = exfat_get_dentry(sb, p_dir, entry + 1, &bh);
ca061973
NJ		 554 if (!ep)
555 return -EIO;
556
557 ep->dentry.stream.name_len = p_uniname->name_len;
558 ep->dentry.stream.name_hash = cpu_to_le16(p_uniname->name_hash);
2c7f8937 559 exfat_update_bh(bh, sync);
ca061973
NJ		 560 brelse(bh);
561
562 for (i = EXFAT_FIRST_CLUSTER; i < num_entries; i++) {
c71510b3 563 ep = exfat_get_dentry(sb, p_dir, entry + i, &bh);
ca061973
NJ		 564 if (!ep)
565 return -EIO;
566
567 exfat_init_name_entry(ep, uniname);
2c7f8937 568 exfat_update_bh(bh, sync);
ca061973
NJ		 569 brelse(bh);
570 uniname += EXFAT_FILE_NAME_LEN;
571 }
572
573 exfat_update_dir_chksum(inode, p_dir, entry);
574 return 0;
575}
576
ff4343da
YM		 577void exfat_remove_entries(struct inode *inode, struct exfat_entry_set_cache *es,
578 int order)
ca061973 579{
ca061973 580 int i;
ca061973 581 struct exfat_dentry *ep;
ca061973 582
ff4343da
YM		 583 for (i = order; i < es->num_entries; i++) {
584 ep = exfat_get_dentry_cached(es, i);
ca061973 585
8258ef28
NJ		 586 if (exfat_get_entry_type(ep) & TYPE_BENIGN_SEC)
587 exfat_free_benign_secondary_clusters(inode, ep);
588
ca061973 589 exfat_set_entry_type(ep, TYPE_DELETED);
ca061973
NJ		 590 }
591
ff4343da
YM		 592 if (order < es->num_entries)
593 es->modified = true;
ca061973
NJ		 594}
595
943af1fd 596void exfat_update_dir_chksum_with_entry_set(struct exfat_entry_set_cache *es)
ca061973 597{
943af1fd 598 int chksum_type = CS_DIR_ENTRY, i;
ca061973 599 unsigned short chksum = 0;
943af1fd 600 struct exfat_dentry *ep;
ca061973 601
f3fe3954 602 for (i = ES_IDX_FILE; i < es->num_entries; i++) {
943af1fd 603 ep = exfat_get_dentry_cached(es, i);
5875bf28
TK		 604 chksum = exfat_calc_chksum16(ep, DENTRY_SIZE, chksum,
605 chksum_type);
ca061973
NJ		 606 chksum_type = CS_DEFAULT;
607 }
f3fe3954 608 ep = exfat_get_dentry_cached(es, ES_IDX_FILE);
943af1fd
TK		 609 ep->dentry.file.checksum = cpu_to_le16(chksum);
610 es->modified = true;
611}
ca061973 612
3b9681ac 613int exfat_put_dentry_set(struct exfat_entry_set_cache *es, int sync)
943af1fd 614{
3db3c3fb 615 int i, err = 0;
ca061973 616
3db3c3fb
TK		 617 if (es->modified)
618 err = exfat_update_bhs(es->bh, es->num_bh, sync);
619
620 for (i = 0; i < es->num_bh; i++)
621 if (err)
622 bforget(es->bh[i]);
623 else
624 brelse(es->bh[i]);
a3ff29a9
YM		 625
626 if (IS_DYNAMIC_ES(es))
627 kfree(es->bh);
628
8b0c4717 629 return err;
ca061973
NJ		 630}
631
632static int exfat_walk_fat_chain(struct super_block *sb,
633 struct exfat_chain *p_dir, unsigned int byte_offset,
634 unsigned int *clu)
635{
636 struct exfat_sb_info *sbi = EXFAT_SB(sb);
637 unsigned int clu_offset;
638 unsigned int cur_clu;
639
640 clu_offset = EXFAT_B_TO_CLU(byte_offset, sbi);
641 cur_clu = p_dir->dir;
642
643 if (p_dir->flags == ALLOC_NO_FAT_CHAIN) {
644 cur_clu += clu_offset;
645 } else {
646 while (clu_offset > 0) {
647 if (exfat_get_next_cluster(sb, &cur_clu))
648 return -EIO;
649 if (cur_clu == EXFAT_EOF_CLUSTER) {
650 exfat_fs_error(sb,
651 "invalid dentry access beyond EOF (clu : %u, eidx : %d)",
652 p_dir->dir,
653 EXFAT_B_TO_DEN(byte_offset));
654 return -EIO;
655 }
656 clu_offset--;
657 }
658 }
659
660 *clu = cur_clu;
661 return 0;
662}
663
8cf05883
CVB		 664static int exfat_find_location(struct super_block *sb, struct exfat_chain *p_dir,
665 int entry, sector_t *sector, int *offset)
ca061973
NJ		 666{
667 int ret;
668 unsigned int off, clu = 0;
669 struct exfat_sb_info *sbi = EXFAT_SB(sb);
670
671 off = EXFAT_DEN_TO_B(entry);
672
673 ret = exfat_walk_fat_chain(sb, p_dir, off, &clu);
674 if (ret)
675 return ret;
676
677 /* byte offset in cluster */
678 off = EXFAT_CLU_OFFSET(off, sbi);
679
680 /* byte offset in sector */
681 *offset = EXFAT_BLK_OFFSET(off, sb);
682
683 /* sector offset in cluster */
684 *sector = EXFAT_B_TO_BLK(off, sb);
685 *sector += exfat_cluster_to_sector(sbi, clu);
686 return 0;
687}
688
689#define EXFAT_MAX_RA_SIZE (128*1024)
690static int exfat_dir_readahead(struct super_block *sb, sector_t sec)
691{
692 struct exfat_sb_info *sbi = EXFAT_SB(sb);
693 struct buffer_head *bh;
694 unsigned int max_ra_count = EXFAT_MAX_RA_SIZE >> sb->s_blocksize_bits;
695 unsigned int page_ra_count = PAGE_SIZE >> sb->s_blocksize_bits;
696 unsigned int adj_ra_count = max(sbi->sect_per_clus, page_ra_count);
697 unsigned int ra_count = min(adj_ra_count, max_ra_count);
698
699 /* Read-ahead is not required */
700 if (sbi->sect_per_clus == 1)
701 return 0;
702
703 if (sec < sbi->data_start_sector) {
d1727d55
JP		 704 exfat_err(sb, "requested sector is invalid(sect:%llu, root:%llu)",
705 (unsigned long long)sec, sbi->data_start_sector);
ca061973
NJ		 706 return -EIO;
707 }
708
709 /* Not sector aligned with ra_count, resize ra_count to page size */
710 if ((sec - sbi->data_start_sector) & (ra_count - 1))
711 ra_count = page_ra_count;
712
713 bh = sb_find_get_block(sb, sec);
714 if (!bh || !buffer_uptodate(bh)) {
715 unsigned int i;
716
717 for (i = 0; i < ra_count; i++)
718 sb_breadahead(sb, (sector_t)(sec + i));
719 }
720 brelse(bh);
721 return 0;
722}
723
724struct exfat_dentry *exfat_get_dentry(struct super_block *sb,
c71510b3 725 struct exfat_chain *p_dir, int entry, struct buffer_head **bh)
ca061973
NJ		 726{
727 unsigned int dentries_per_page = EXFAT_B_TO_DEN(PAGE_SIZE);
728 int off;
729 sector_t sec;
730
731 if (p_dir->dir == DIR_DELETED) {
d1727d55 732 exfat_err(sb, "abnormal access to deleted dentry");
ca061973
NJ		 733 return NULL;
734 }
735
736 if (exfat_find_location(sb, p_dir, entry, &sec, &off))
737 return NULL;
738
739 if (p_dir->dir != EXFAT_FREE_CLUSTER &&
740 !(entry & (dentries_per_page - 1)))
741 exfat_dir_readahead(sb, sec);
742
743 *bh = sb_bread(sb, sec);
744 if (!*bh)
745 return NULL;
746
ca061973
NJ		 747 return (struct exfat_dentry *)((*bh)->b_data + off);
748}
749
750enum exfat_validate_dentry_mode {
ca061973
NJ		 751 ES_MODE_GET_FILE_ENTRY,
752 ES_MODE_GET_STRM_ENTRY,
753 ES_MODE_GET_NAME_ENTRY,
754 ES_MODE_GET_CRITICAL_SEC_ENTRY,
8258ef28 755 ES_MODE_GET_BENIGN_SEC_ENTRY,
ca061973
NJ		 756};
757
758static bool exfat_validate_entry(unsigned int type,
759 enum exfat_validate_dentry_mode *mode)
760{
761 if (type == TYPE_UNUSED || type == TYPE_DELETED)
762 return false;
763
764 switch (*mode) {
ca061973
NJ		 765 case ES_MODE_GET_FILE_ENTRY:
766 if (type != TYPE_STREAM)
767 return false;
768 *mode = ES_MODE_GET_STRM_ENTRY;
8258ef28 769 break;
ca061973
NJ		 770 case ES_MODE_GET_STRM_ENTRY:
771 if (type != TYPE_EXTEND)
772 return false;
773 *mode = ES_MODE_GET_NAME_ENTRY;
8258ef28 774 break;
ca061973 775 case ES_MODE_GET_NAME_ENTRY:
8258ef28
NJ		 776 if (type & TYPE_BENIGN_SEC)
777 *mode = ES_MODE_GET_BENIGN_SEC_ENTRY;
778 else if (type != TYPE_EXTEND)
ca061973 779 return false;
8258ef28
NJ		 780 break;
781 case ES_MODE_GET_BENIGN_SEC_ENTRY:
782 /* Assume unreconized benign secondary entry */
783 if (!(type & TYPE_BENIGN_SEC))
ca061973 784 return false;
8258ef28 785 break;
ca061973 786 default:
ca061973
NJ		 787 return false;
788 }
8258ef28
NJ		 789
790 return true;
ca061973
NJ		 791}
792
943af1fd
TK		 793struct exfat_dentry *exfat_get_dentry_cached(
794 struct exfat_entry_set_cache *es, int num)
795{
796 int off = es->start_off + num * DENTRY_SIZE;
797 struct buffer_head *bh = es->bh[EXFAT_B_TO_BLK(off, es->sb)];
798 char *p = bh->b_data + EXFAT_BLK_OFFSET(off, es->sb);
799
800 return (struct exfat_dentry *)p;
801}
802
ca061973 803/*
7b6bab23 804 * Returns a set of dentries.
ca061973 805 *
943af1fd
TK		 806 * Note It provides a direct pointer to bh->data via exfat_get_dentry_cached().
807 * User should call exfat_get_dentry_set() after setting 'modified' to apply
808 * changes made in this entry set to the real device.
ca061973
NJ		 809 *
810 * in:
811 * sb+p_dir+entry: indicates a file/dir
7b6bab23
YM		 812 * num_entries: specifies how many dentries should be included.
813 * It will be set to es->num_entries if it is not 0.
814 * If num_entries is 0, es->num_entries will be obtained
815 * from the first dentry.
816 * out:
817 * es: pointer of entry set on success.
ca061973 818 * return:
7b6bab23
YM		 819 * 0 on success
820 * -error code on failure
ca061973 821 */
7b6bab23 822static int __exfat_get_dentry_set(struct exfat_entry_set_cache *es,
20914ff6 823 struct super_block *sb, struct exfat_chain *p_dir, int entry,
7b6bab23 824 unsigned int num_entries)
ca061973 825{
943af1fd 826 int ret, i, num_bh;
36955d36 827 unsigned int off;
ca061973
NJ		 828 sector_t sec;
829 struct exfat_sb_info *sbi = EXFAT_SB(sb);
ca061973
NJ		 830 struct buffer_head *bh;
831
832 if (p_dir->dir == DIR_DELETED) {
d1727d55 833 exfat_err(sb, "access to deleted dentry");
20914ff6 834 return -EIO;
ca061973
NJ		 835 }
836
36955d36 837 ret = exfat_find_location(sb, p_dir, entry, &sec, &off);
ca061973 838 if (ret)
20914ff6 839 return ret;
ca061973 840
20914ff6 841 memset(es, 0, sizeof(*es));
943af1fd
TK		 842 es->sb = sb;
843 es->modified = false;
943af1fd 844 es->start_off = off;
a3ff29a9 845 es->bh = es->__bh;
ca061973 846
ca061973
NJ		 847 bh = sb_bread(sb, sec);
848 if (!bh)
20914ff6 849 return -EIO;
943af1fd 850 es->bh[es->num_bh++] = bh;
ca061973 851
7b6bab23
YM		 852 if (num_entries == ES_ALL_ENTRIES) {
853 struct exfat_dentry *ep;
854
855 ep = exfat_get_dentry_cached(es, ES_IDX_FILE);
856 if (ep->type != EXFAT_FILE) {
857 brelse(bh);
858 return -EIO;
859 }
860
861 num_entries = ep->dentry.file.num_ext + 1;
862 }
ca061973 863
ca061973 864 es->num_entries = num_entries;
ca061973 865
943af1fd 866 num_bh = EXFAT_B_TO_BLK_ROUND_UP(off + num_entries * DENTRY_SIZE, sb);
a3ff29a9
YM		 867 if (num_bh > ARRAY_SIZE(es->__bh)) {
868 es->bh = kmalloc_array(num_bh, sizeof(*es->bh), GFP_KERNEL);
869 if (!es->bh) {
870 brelse(bh);
20914ff6 871 return -ENOMEM;
a3ff29a9
YM		 872 }
873 es->bh[0] = bh;
874 }
875
943af1fd
TK		 876 for (i = 1; i < num_bh; i++) {
877 /* get the next sector */
878 if (exfat_is_last_sector_in_cluster(sbi, sec)) {
36955d36
YM		 879 unsigned int clu = exfat_sector_to_cluster(sbi, sec);
880
943af1fd
TK		 881 if (p_dir->flags == ALLOC_NO_FAT_CHAIN)
882 clu++;
883 else if (exfat_get_next_cluster(sb, &clu))
3b9681ac 884 goto put_es;
943af1fd 885 sec = exfat_cluster_to_sector(sbi, clu);
ca061973 886 } else {
943af1fd 887 sec++;
ca061973 888 }
943af1fd
TK		 889
890 bh = sb_bread(sb, sec);
891 if (!bh)
3b9681ac 892 goto put_es;
943af1fd 893 es->bh[es->num_bh++] = bh;
ca061973
NJ		 894 }
895
7b6bab23
YM		 896 return 0;
897
898put_es:
899 exfat_put_dentry_set(es, false);
900 return -EIO;
901}
902
903int exfat_get_dentry_set(struct exfat_entry_set_cache *es,
904 struct super_block *sb, struct exfat_chain *p_dir,
905 int entry, unsigned int num_entries)
906{
907 int ret, i;
908 struct exfat_dentry *ep;
909 enum exfat_validate_dentry_mode mode = ES_MODE_GET_FILE_ENTRY;
910
911 ret = __exfat_get_dentry_set(es, sb, p_dir, entry, num_entries);
912 if (ret < 0)
913 return ret;
914
6fa96cd5 915 /* validate cached dentries */
7b6bab23 916 for (i = ES_IDX_STREAM; i < es->num_entries; i++) {
943af1fd
TK		 917 ep = exfat_get_dentry_cached(es, i);
918 if (!exfat_validate_entry(exfat_get_entry_type(ep), &mode))
3b9681ac 919 goto put_es;
943af1fd 920 }
20914ff6 921 return 0;
ca061973 922
3b9681ac
YM		 923put_es:
924 exfat_put_dentry_set(es, false);
20914ff6 925 return -EIO;
ca061973
NJ		 926}
927
01da3a51
YM		 928static int exfat_validate_empty_dentry_set(struct exfat_entry_set_cache *es)
929{
930 struct exfat_dentry *ep;
931 struct buffer_head *bh;
932 int i, off;
933 bool unused_hit = false;
934
935 /*
936 * ONLY UNUSED OR DELETED DENTRIES ARE ALLOWED:
937 * Although it violates the specification for a deleted entry to
938 * follow an unused entry, some exFAT implementations could work
939 * like this. Therefore, to improve compatibility, let's allow it.
940 */
941 for (i = 0; i < es->num_entries; i++) {
942 ep = exfat_get_dentry_cached(es, i);
943 if (ep->type == EXFAT_UNUSED) {
944 unused_hit = true;
945 } else if (!IS_EXFAT_DELETED(ep->type)) {
946 if (unused_hit)
947 goto err_used_follow_unused;
948 i++;
949 goto count_skip_entries;
950 }
951 }
952
953 return 0;
954
955err_used_follow_unused:
956 off = es->start_off + (i << DENTRY_SIZE_BITS);
957 bh = es->bh[EXFAT_B_TO_BLK(off, es->sb)];
958
959 exfat_fs_error(es->sb,
960 "in sector %lld, dentry %d should be unused, but 0x%x",
961 bh->b_blocknr, off >> DENTRY_SIZE_BITS, ep->type);
962
963 return -EIO;
964
965count_skip_entries:
966 es->num_entries = EXFAT_B_TO_DEN(EXFAT_BLK_TO_B(es->num_bh, es->sb) - es->start_off);
967 for (; i < es->num_entries; i++) {
968 ep = exfat_get_dentry_cached(es, i);
969 if (IS_EXFAT_DELETED(ep->type))
970 break;
971 }
972
973 return i;
974}
975
976/*
977 * Get an empty dentry set.
978 *
979 * in:
980 * sb+p_dir+entry: indicates the empty dentry location
981 * num_entries: specifies how many empty dentries should be included.
982 * out:
983 * es: pointer of empty dentry set on success.
984 * return:
985 * 0 : on success
986 * >0 : the dentries are not empty, the return value is the number of
987 * dentries to be skipped for the next lookup.
988 * <0 : on failure
989 */
990int exfat_get_empty_dentry_set(struct exfat_entry_set_cache *es,
991 struct super_block *sb, struct exfat_chain *p_dir,
992 int entry, unsigned int num_entries)
993{
994 int ret;
995
996 ret = __exfat_get_dentry_set(es, sb, p_dir, entry, num_entries);
997 if (ret < 0)
998 return ret;
999
1000 ret = exfat_validate_empty_dentry_set(es);
1001 if (ret)
1002 exfat_put_dentry_set(es, false);
1003
1004 return ret;
1005}
1006
ff39899b
YM		 1007static inline void exfat_reset_empty_hint(struct exfat_hint_femp *hint_femp)
1008{
1009 hint_femp->eidx = EXFAT_HINT_NONE;
1010 hint_femp->count = 0;
1011}
1012
1013static inline void exfat_set_empty_hint(struct exfat_inode_info *ei,
1014 struct exfat_hint_femp *candi_empty, struct exfat_chain *clu,
e298c8a8 1015 int dentry, int num_entries, int entry_type)
ff39899b
YM		 1016{
1017 if (ei->hint_femp.eidx == EXFAT_HINT_NONE ||
1018 ei->hint_femp.eidx > dentry) {
e298c8a8
YM		 1019 int total_entries = EXFAT_B_TO_DEN(i_size_read(&ei->vfs_inode));
1020
ff39899b
YM		 1021 if (candi_empty->count == 0) {
1022 candi_empty->cur = *clu;
1023 candi_empty->eidx = dentry;
1024 }
1025
e298c8a8
YM		 1026 if (entry_type == TYPE_UNUSED)
1027 candi_empty->count += total_entries - dentry;
1028 else
1029 candi_empty->count++;
1030
1031 if (candi_empty->count == num_entries ||
1032 candi_empty->count + candi_empty->eidx == total_entries)
ff39899b
YM		 1033 ei->hint_femp = *candi_empty;
1034 }
1035}
1036
ca061973
NJ		 1037enum {
1038 DIRENT_STEP_FILE,
1039 DIRENT_STEP_STRM,
1040 DIRENT_STEP_NAME,
1041 DIRENT_STEP_SECD,
1042};
1043
1044/*
c6e2f52e
HK		 1045 * @ei: inode info of parent directory
1046 * @p_dir: directory structure of parent directory
1047 * @num_entries:entry size of p_uniname
1048 * @hint_opt: If p_uniname is found, filled with optimized dir/entry
1049 * for traversing cluster chain.
1050 * @return:
1051 * >= 0: file directory entry position where the name exists
1052 * -ENOENT: entry with the name does not exist
1053 * -EIO: I/O error
ca061973
NJ		 1054 */
1055int exfat_find_dir_entry(struct super_block *sb, struct exfat_inode_info *ei,
1056 struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname,
72880cb5 1057 struct exfat_hint *hint_opt)
ca061973
NJ		 1058{
1059 int i, rewind = 0, dentry = 0, end_eidx = 0, num_ext = 0, len;
1060 int order, step, name_len = 0;
ff39899b 1061 int dentries_per_clu;
ca061973
NJ		 1062 unsigned int entry_type;
1063 unsigned short *uniname = NULL;
1064 struct exfat_chain clu;
1065 struct exfat_hint *hint_stat = &ei->hint_stat;
1066 struct exfat_hint_femp candi_empty;
1067 struct exfat_sb_info *sbi = EXFAT_SB(sb);
72880cb5
YM		 1068 int num_entries = exfat_calc_num_entries(p_uniname);
1069
1070 if (num_entries < 0)
1071 return num_entries;
ca061973
NJ		 1072
1073 dentries_per_clu = sbi->dentries_per_clu;
1074
1075 exfat_chain_dup(&clu, p_dir);
1076
1077 if (hint_stat->eidx) {
1078 clu.dir = hint_stat->clu;
1079 dentry = hint_stat->eidx;
1080 end_eidx = dentry;
1081 }
1082
ff39899b
YM		 1083 exfat_reset_empty_hint(&ei->hint_femp);
1084
ca061973
NJ		 1085rewind:
1086 order = 0;
1087 step = DIRENT_STEP_FILE;
ff39899b
YM		 1088 exfat_reset_empty_hint(&candi_empty);
1089
ca061973
NJ		 1090 while (clu.dir != EXFAT_EOF_CLUSTER) {
1091 i = dentry & (dentries_per_clu - 1);
1092 for (; i < dentries_per_clu; i++, dentry++) {
1093 struct exfat_dentry *ep;
1094 struct buffer_head *bh;
1095
1096 if (rewind && dentry == end_eidx)
1097 goto not_found;
1098
c71510b3 1099 ep = exfat_get_dentry(sb, &clu, i, &bh);
ca061973
NJ		 1100 if (!ep)
1101 return -EIO;
1102
1103 entry_type = exfat_get_entry_type(ep);
1104
1105 if (entry_type == TYPE_UNUSED ||
1106 entry_type == TYPE_DELETED) {
1107 step = DIRENT_STEP_FILE;
1108
ff39899b 1109 exfat_set_empty_hint(ei, &candi_empty, &clu,
e298c8a8
YM		 1110 dentry, num_entries,
1111 entry_type);
ca061973
NJ		 1112
1113 brelse(bh);
1114 if (entry_type == TYPE_UNUSED)
1115 goto not_found;
1116 continue;
1117 }
1118
ff39899b 1119 exfat_reset_empty_hint(&candi_empty);
ca061973
NJ		 1120
1121 if (entry_type == TYPE_FILE || entry_type == TYPE_DIR) {
1122 step = DIRENT_STEP_FILE;
c6e2f52e
HK		 1123 hint_opt->clu = clu.dir;
1124 hint_opt->eidx = i;
72880cb5
YM		 1125 num_ext = ep->dentry.file.num_ext;
1126 step = DIRENT_STEP_STRM;
ca061973
NJ		 1127 brelse(bh);
1128 continue;
1129 }
1130
1131 if (entry_type == TYPE_STREAM) {
5875bf28 1132 u16 name_hash;
ca061973
NJ		 1133
1134 if (step != DIRENT_STEP_STRM) {
1135 step = DIRENT_STEP_FILE;
1136 brelse(bh);
1137 continue;
1138 }
1139 step = DIRENT_STEP_FILE;
1140 name_hash = le16_to_cpu(
1141 ep->dentry.stream.name_hash);
1142 if (p_uniname->name_hash == name_hash &&
1143 p_uniname->name_len ==
1144 ep->dentry.stream.name_len) {
1145 step = DIRENT_STEP_NAME;
1146 order = 1;
1147 name_len = 0;
1148 }
1149 brelse(bh);
1150 continue;
1151 }
1152
1153 brelse(bh);
1154 if (entry_type == TYPE_EXTEND) {
1155 unsigned short entry_uniname[16], unichar;
1156
d4233457
NJ		 1157 if (step != DIRENT_STEP_NAME ||
1158 name_len >= MAX_NAME_LENGTH) {
ca061973
NJ		 1159 step = DIRENT_STEP_FILE;
1160 continue;
1161 }
1162
1163 if (++order == 2)
1164 uniname = p_uniname->name;
1165 else
1166 uniname += EXFAT_FILE_NAME_LEN;
1167
1168 len = exfat_extract_uni_name(ep, entry_uniname);
1169 name_len += len;
1170
1171 unichar = *(uniname+len);
1172 *(uniname+len) = 0x0;
1173
1174 if (exfat_uniname_ncmp(sb, uniname,
1175 entry_uniname, len)) {
1176 step = DIRENT_STEP_FILE;
1177 } else if (p_uniname->name_len == name_len) {
1178 if (order == num_ext)
1179 goto found;
1180 step = DIRENT_STEP_SECD;
1181 }
1182
1183 *(uniname+len) = unichar;
1184 continue;
1185 }
1186
1187 if (entry_type &
1188 (TYPE_CRITICAL_SEC | TYPE_BENIGN_SEC)) {
1189 if (step == DIRENT_STEP_SECD) {
1190 if (++order == num_ext)
1191 goto found;
1192 continue;
1193 }
1194 }
1195 step = DIRENT_STEP_FILE;
1196 }
1197
1198 if (clu.flags == ALLOC_NO_FAT_CHAIN) {
1199 if (--clu.size > 0)
1200 clu.dir++;
1201 else
1202 clu.dir = EXFAT_EOF_CLUSTER;
1203 } else {
1204 if (exfat_get_next_cluster(sb, &clu.dir))
1205 return -EIO;
1206 }
1207 }
1208
1209not_found:
1210 /*
1211 * We started at not 0 index,so we should try to find target
1212 * from 0 index to the index we started at.
1213 */
1214 if (!rewind && end_eidx) {
1215 rewind = 1;
1216 dentry = 0;
1217 clu.dir = p_dir->dir;
ca061973
NJ		 1218 goto rewind;
1219 }
1220
e298c8a8
YM		 1221 /*
1222 * set the EXFAT_EOF_CLUSTER flag to avoid search
1223 * from the beginning again when allocated a new cluster
1224 */
1225 if (ei->hint_femp.eidx == EXFAT_HINT_NONE) {
1226 ei->hint_femp.cur.dir = EXFAT_EOF_CLUSTER;
1227 ei->hint_femp.eidx = p_dir->size * dentries_per_clu;
1228 ei->hint_femp.count = 0;
1229 }
1230
ca061973
NJ		 1231 /* initialized hint_stat */
1232 hint_stat->clu = p_dir->dir;
1233 hint_stat->eidx = 0;
1234 return -ENOENT;
1235
1236found:
1237 /* next dentry we'll find is out of this cluster */
1238 if (!((dentry + 1) & (dentries_per_clu - 1))) {
1239 int ret = 0;
1240
1241 if (clu.flags == ALLOC_NO_FAT_CHAIN) {
1242 if (--clu.size > 0)
1243 clu.dir++;
1244 else
1245 clu.dir = EXFAT_EOF_CLUSTER;
1246 } else {
1247 ret = exfat_get_next_cluster(sb, &clu.dir);
1248 }
1249
d2fa0c33 1250 if (ret || clu.dir == EXFAT_EOF_CLUSTER) {
ca061973
NJ		 1251 /* just initialized hint_stat */
1252 hint_stat->clu = p_dir->dir;
1253 hint_stat->eidx = 0;
1254 return (dentry - num_ext);
1255 }
1256 }
1257
1258 hint_stat->clu = clu.dir;
1259 hint_stat->eidx = dentry + 1;
1260 return dentry - num_ext;
1261}
1262
1263int exfat_count_ext_entries(struct super_block *sb, struct exfat_chain *p_dir,
1264 int entry, struct exfat_dentry *ep)
1265{
1266 int i, count = 0;
1267 unsigned int type;
1268 struct exfat_dentry *ext_ep;
1269 struct buffer_head *bh;
1270
1271 for (i = 0, entry++; i < ep->dentry.file.num_ext; i++, entry++) {
c71510b3 1272 ext_ep = exfat_get_dentry(sb, p_dir, entry, &bh);
ca061973
NJ		 1273 if (!ext_ep)
1274 return -EIO;
1275
1276 type = exfat_get_entry_type(ext_ep);
1277 brelse(bh);
8258ef28 1278 if (type & TYPE_CRITICAL_SEC || type & TYPE_BENIGN_SEC)
ca061973 1279 count++;
ca061973
NJ		 1280 }
1281 return count;
1282}
1283
1284int exfat_count_dir_entries(struct super_block *sb, struct exfat_chain *p_dir)
1285{
1286 int i, count = 0;
1287 int dentries_per_clu;
1288 unsigned int entry_type;
1289 struct exfat_chain clu;
1290 struct exfat_dentry *ep;
1291 struct exfat_sb_info *sbi = EXFAT_SB(sb);
1292 struct buffer_head *bh;
1293
1294 dentries_per_clu = sbi->dentries_per_clu;
1295
1296 exfat_chain_dup(&clu, p_dir);
1297
1298 while (clu.dir != EXFAT_EOF_CLUSTER) {
1299 for (i = 0; i < dentries_per_clu; i++) {
c71510b3 1300 ep = exfat_get_dentry(sb, &clu, i, &bh);
ca061973
NJ		 1301 if (!ep)
1302 return -EIO;
1303 entry_type = exfat_get_entry_type(ep);
1304 brelse(bh);
1305
1306 if (entry_type == TYPE_UNUSED)
1307 return count;
1308 if (entry_type != TYPE_DIR)
1309 continue;
1310 count++;
1311 }
1312
1313 if (clu.flags == ALLOC_NO_FAT_CHAIN) {
1314 if (--clu.size > 0)
1315 clu.dir++;
1316 else
1317 clu.dir = EXFAT_EOF_CLUSTER;
1318 } else {
1319 if (exfat_get_next_cluster(sb, &(clu.dir)))
1320 return -EIO;
1321 }
1322 }
1323
1324 return count;
1325}
Linux 6.x block layer and io_uring tree(s)