Commit | Line | Data |
---|---|---|
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 | ||
8258ef28 | 32 | static 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; |
ca061973 | 37 | |
8258ef28 NJ |
38 | err = exfat_get_dentry_set(&es, sb, p_dir, entry, ES_ALL_ENTRIES); |
39 | if (err) | |
40 | return err; | |
ca061973 | 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 | */ | |
f3fe3954 | 48 | for (i = ES_IDX_FIRST_FILENAME; i < es.num_entries; i++) { |
20914ff6 | 49 | struct exfat_dentry *ep = exfat_get_dentry_cached(&es, i); |
943af1fd | 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 | ||
3b9681ac | 59 | exfat_put_dentry_set(&es, false); |
8258ef28 | 60 | return 0; |
ca061973 NJ |
61 | } |
62 | ||
63 | /* read a directory entry from the opened directory */ | |
04cee52f | 64 | static int exfat_readdir(struct inode *inode, loff_t *cpos, struct exfat_dir_entry *dir_entry) |
ca061973 | 65 | { |
8258ef28 | 66 | int i, dentries_per_clu, num_ext, err; |
1e5654de | 67 | unsigned int type, clu_offset, max_dentries; |
ca061973 NJ |
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; | |
1e5654de | 88 | max_dentries = (unsigned int)min_t(u64, MAX_EXFAT_DENTRIES, |
088f1343 | 89 | (u64)EXFAT_CLU_TO_DEN(sbi->num_clusters, sbi)); |
ca061973 | 90 | |
088f1343 | 91 | clu_offset = EXFAT_DEN_TO_CLU(dentry, sbi); |
ca061973 NJ |
92 | exfat_chain_dup(&clu, &dir); |
93 | ||
94 | if (clu.flags == ALLOC_NO_FAT_CHAIN) { | |
95 | clu.dir += clu_offset; | |
96 | clu.size -= clu_offset; | |
97 | } else { | |
98 | /* hint_information */ | |
99 | if (clu_offset > 0 && ei->hint_bmap.off != EXFAT_EOF_CLUSTER && | |
100 | ei->hint_bmap.off > 0 && clu_offset >= ei->hint_bmap.off) { | |
101 | clu_offset -= ei->hint_bmap.off; | |
102 | clu.dir = ei->hint_bmap.clu; | |
103 | } | |
104 | ||
706fdcac | 105 | while (clu_offset > 0 && clu.dir != EXFAT_EOF_CLUSTER) { |
ca061973 NJ |
106 | if (exfat_get_next_cluster(sb, &(clu.dir))) |
107 | return -EIO; | |
108 | ||
109 | clu_offset--; | |
110 | } | |
111 | } | |
112 | ||
1e5654de | 113 | while (clu.dir != EXFAT_EOF_CLUSTER && dentry < max_dentries) { |
ca061973 NJ |
114 | i = dentry & (dentries_per_clu - 1); |
115 | ||
116 | for ( ; i < dentries_per_clu; i++, dentry++) { | |
c71510b3 | 117 | ep = exfat_get_dentry(sb, &clu, i, &bh); |
ca061973 NJ |
118 | if (!ep) |
119 | return -EIO; | |
120 | ||
121 | type = exfat_get_entry_type(ep); | |
122 | if (type == TYPE_UNUSED) { | |
123 | brelse(bh); | |
124 | break; | |
125 | } | |
126 | ||
127 | if (type != TYPE_FILE && type != TYPE_DIR) { | |
128 | brelse(bh); | |
129 | continue; | |
130 | } | |
131 | ||
04cee52f | 132 | num_ext = ep->dentry.file.num_ext; |
ca061973 NJ |
133 | dir_entry->attr = le16_to_cpu(ep->dentry.file.attr); |
134 | exfat_get_entry_time(sbi, &dir_entry->crtime, | |
135 | ep->dentry.file.create_tz, | |
136 | ep->dentry.file.create_time, | |
137 | ep->dentry.file.create_date, | |
ed0f84d3 | 138 | ep->dentry.file.create_time_cs); |
ca061973 NJ |
139 | exfat_get_entry_time(sbi, &dir_entry->mtime, |
140 | ep->dentry.file.modify_tz, | |
141 | ep->dentry.file.modify_time, | |
142 | ep->dentry.file.modify_date, | |
ed0f84d3 | 143 | ep->dentry.file.modify_time_cs); |
ca061973 NJ |
144 | exfat_get_entry_time(sbi, &dir_entry->atime, |
145 | ep->dentry.file.access_tz, | |
146 | ep->dentry.file.access_time, | |
147 | ep->dentry.file.access_date, | |
148 | 0); | |
149 | ||
150 | *uni_name.name = 0x0; | |
8258ef28 | 151 | err = exfat_get_uniname_from_ext_entry(sb, &clu, i, |
ca061973 | 152 | uni_name.name); |
8258ef28 NJ |
153 | if (err) { |
154 | brelse(bh); | |
155 | continue; | |
156 | } | |
ca061973 NJ |
157 | exfat_utf16_to_nls(sb, &uni_name, |
158 | dir_entry->namebuf.lfn, | |
159 | dir_entry->namebuf.lfnbuf_len); | |
160 | brelse(bh); | |
161 | ||
c71510b3 | 162 | ep = exfat_get_dentry(sb, &clu, i + 1, &bh); |
ca061973 NJ |
163 | if (!ep) |
164 | return -EIO; | |
165 | dir_entry->size = | |
166 | le64_to_cpu(ep->dentry.stream.valid_size); | |
04cee52f | 167 | dir_entry->entry = dentry; |
ca061973 NJ |
168 | brelse(bh); |
169 | ||
088f1343 | 170 | ei->hint_bmap.off = EXFAT_DEN_TO_CLU(dentry, sbi); |
ca061973 NJ |
171 | ei->hint_bmap.clu = clu.dir; |
172 | ||
04cee52f | 173 | *cpos = EXFAT_DEN_TO_B(dentry + 1 + num_ext); |
ca061973 NJ |
174 | return 0; |
175 | } | |
176 | ||
177 | if (clu.flags == ALLOC_NO_FAT_CHAIN) { | |
178 | if (--clu.size > 0) | |
179 | clu.dir++; | |
180 | else | |
181 | clu.dir = EXFAT_EOF_CLUSTER; | |
182 | } else { | |
183 | if (exfat_get_next_cluster(sb, &(clu.dir))) | |
184 | return -EIO; | |
185 | } | |
186 | } | |
187 | ||
188 | dir_entry->namebuf.lfn[0] = '\0'; | |
04cee52f | 189 | *cpos = EXFAT_DEN_TO_B(dentry); |
ca061973 NJ |
190 | return 0; |
191 | } | |
192 | ||
193 | static void exfat_init_namebuf(struct exfat_dentry_namebuf *nb) | |
194 | { | |
195 | nb->lfn = NULL; | |
196 | nb->lfnbuf_len = 0; | |
197 | } | |
198 | ||
199 | static int exfat_alloc_namebuf(struct exfat_dentry_namebuf *nb) | |
200 | { | |
201 | nb->lfn = __getname(); | |
202 | if (!nb->lfn) | |
203 | return -ENOMEM; | |
204 | nb->lfnbuf_len = MAX_VFSNAME_BUF_SIZE; | |
205 | return 0; | |
206 | } | |
207 | ||
208 | static void exfat_free_namebuf(struct exfat_dentry_namebuf *nb) | |
209 | { | |
210 | if (!nb->lfn) | |
211 | return; | |
212 | ||
213 | __putname(nb->lfn); | |
214 | exfat_init_namebuf(nb); | |
215 | } | |
216 | ||
217 | /* skip iterating emit_dots when dir is empty */ | |
218 | #define ITER_POS_FILLED_DOTS (2) | |
703e3e9a | 219 | static int exfat_iterate(struct file *file, struct dir_context *ctx) |
ca061973 | 220 | { |
703e3e9a | 221 | struct inode *inode = file_inode(file); |
ca061973 NJ |
222 | struct super_block *sb = inode->i_sb; |
223 | struct inode *tmp; | |
224 | struct exfat_dir_entry de; | |
225 | struct exfat_dentry_namebuf *nb = &(de.namebuf); | |
226 | struct exfat_inode_info *ei = EXFAT_I(inode); | |
227 | unsigned long inum; | |
228 | loff_t cpos, i_pos; | |
229 | int err = 0, fake_offset = 0; | |
230 | ||
231 | exfat_init_namebuf(nb); | |
232 | mutex_lock(&EXFAT_SB(sb)->s_lock); | |
233 | ||
234 | cpos = ctx->pos; | |
703e3e9a | 235 | if (!dir_emit_dots(file, ctx)) |
ca061973 NJ |
236 | goto unlock; |
237 | ||
238 | if (ctx->pos == ITER_POS_FILLED_DOTS) { | |
239 | cpos = 0; | |
240 | fake_offset = 1; | |
241 | } | |
242 | ||
6cb5d1a1 | 243 | cpos = round_up(cpos, DENTRY_SIZE); |
ca061973 NJ |
244 | |
245 | /* name buffer should be allocated before use */ | |
246 | err = exfat_alloc_namebuf(nb); | |
247 | if (err) | |
248 | goto unlock; | |
249 | get_new: | |
1e5654de | 250 | if (ei->flags == ALLOC_NO_FAT_CHAIN && cpos >= i_size_read(inode)) |
ca061973 NJ |
251 | goto end_of_dir; |
252 | ||
04cee52f | 253 | err = exfat_readdir(inode, &cpos, &de); |
ca061973 NJ |
254 | if (err) { |
255 | /* | |
256 | * At least we tried to read a sector. Move cpos to next sector | |
257 | * position (should be aligned). | |
258 | */ | |
259 | if (err == -EIO) { | |
260 | cpos += 1 << (sb->s_blocksize_bits); | |
261 | cpos &= ~(sb->s_blocksize - 1); | |
262 | } | |
263 | ||
264 | err = -EIO; | |
265 | goto end_of_dir; | |
266 | } | |
267 | ||
ca061973 NJ |
268 | if (!nb->lfn[0]) |
269 | goto end_of_dir; | |
270 | ||
04cee52f | 271 | i_pos = ((loff_t)ei->start_clu << 32) | (de.entry & 0xffffffff); |
ca061973 NJ |
272 | tmp = exfat_iget(sb, i_pos); |
273 | if (tmp) { | |
274 | inum = tmp->i_ino; | |
275 | iput(tmp); | |
276 | } else { | |
277 | inum = iunique(sb, EXFAT_ROOT_INO); | |
278 | } | |
279 | ||
280 | /* | |
281 | * Before calling dir_emit(), sb_lock should be released. | |
282 | * Because page fault can occur in dir_emit() when the size | |
283 | * of buffer given from user is larger than one page size. | |
284 | */ | |
285 | mutex_unlock(&EXFAT_SB(sb)->s_lock); | |
286 | if (!dir_emit(ctx, nb->lfn, strlen(nb->lfn), inum, | |
287 | (de.attr & ATTR_SUBDIR) ? DT_DIR : DT_REG)) | |
288 | goto out_unlocked; | |
289 | mutex_lock(&EXFAT_SB(sb)->s_lock); | |
290 | ctx->pos = cpos; | |
291 | goto get_new; | |
292 | ||
293 | end_of_dir: | |
294 | if (!cpos && fake_offset) | |
295 | cpos = ITER_POS_FILLED_DOTS; | |
296 | ctx->pos = cpos; | |
297 | unlock: | |
298 | mutex_unlock(&EXFAT_SB(sb)->s_lock); | |
299 | out_unlocked: | |
300 | /* | |
301 | * To improve performance, free namebuf after unlock sb_lock. | |
302 | * If namebuf is not allocated, this function do nothing | |
303 | */ | |
304 | exfat_free_namebuf(nb); | |
305 | return err; | |
306 | } | |
307 | ||
308 | const struct file_operations exfat_dir_operations = { | |
309 | .llseek = generic_file_llseek, | |
310 | .read = generic_read_dir, | |
311 | .iterate = exfat_iterate, | |
654762df HK |
312 | .unlocked_ioctl = exfat_ioctl, |
313 | #ifdef CONFIG_COMPAT | |
314 | .compat_ioctl = exfat_compat_ioctl, | |
315 | #endif | |
5267456e | 316 | .fsync = exfat_file_fsync, |
ca061973 NJ |
317 | }; |
318 | ||
319 | int exfat_alloc_new_dir(struct inode *inode, struct exfat_chain *clu) | |
320 | { | |
321 | int ret; | |
322 | ||
323 | exfat_chain_set(clu, EXFAT_EOF_CLUSTER, 0, ALLOC_NO_FAT_CHAIN); | |
324 | ||
23befe49 | 325 | ret = exfat_alloc_cluster(inode, 1, clu, IS_DIRSYNC(inode)); |
ca061973 NJ |
326 | if (ret) |
327 | return ret; | |
328 | ||
329 | return exfat_zeroed_cluster(inode, clu->dir); | |
330 | } | |
331 | ||
332 | int exfat_calc_num_entries(struct exfat_uni_name *p_uniname) | |
333 | { | |
334 | int len; | |
335 | ||
336 | len = p_uniname->name_len; | |
337 | if (len == 0) | |
338 | return -EINVAL; | |
339 | ||
340 | /* 1 file entry + 1 stream entry + name entries */ | |
f3fe3954 | 341 | return ES_ENTRY_NUM(len); |
ca061973 NJ |
342 | } |
343 | ||
344 | unsigned int exfat_get_entry_type(struct exfat_dentry *ep) | |
345 | { | |
346 | if (ep->type == EXFAT_UNUSED) | |
347 | return TYPE_UNUSED; | |
348 | if (IS_EXFAT_DELETED(ep->type)) | |
349 | return TYPE_DELETED; | |
350 | if (ep->type == EXFAT_INVAL) | |
351 | return TYPE_INVALID; | |
352 | if (IS_EXFAT_CRITICAL_PRI(ep->type)) { | |
353 | if (ep->type == EXFAT_BITMAP) | |
354 | return TYPE_BITMAP; | |
355 | if (ep->type == EXFAT_UPCASE) | |
356 | return TYPE_UPCASE; | |
357 | if (ep->type == EXFAT_VOLUME) | |
358 | return TYPE_VOLUME; | |
359 | if (ep->type == EXFAT_FILE) { | |
360 | if (le16_to_cpu(ep->dentry.file.attr) & ATTR_SUBDIR) | |
361 | return TYPE_DIR; | |
362 | return TYPE_FILE; | |
363 | } | |
364 | return TYPE_CRITICAL_PRI; | |
365 | } | |
366 | if (IS_EXFAT_BENIGN_PRI(ep->type)) { | |
367 | if (ep->type == EXFAT_GUID) | |
368 | return TYPE_GUID; | |
369 | if (ep->type == EXFAT_PADDING) | |
370 | return TYPE_PADDING; | |
371 | if (ep->type == EXFAT_ACLTAB) | |
372 | return TYPE_ACLTAB; | |
373 | return TYPE_BENIGN_PRI; | |
374 | } | |
375 | if (IS_EXFAT_CRITICAL_SEC(ep->type)) { | |
376 | if (ep->type == EXFAT_STREAM) | |
377 | return TYPE_STREAM; | |
378 | if (ep->type == EXFAT_NAME) | |
379 | return TYPE_EXTEND; | |
380 | if (ep->type == EXFAT_ACL) | |
381 | return TYPE_ACL; | |
382 | return TYPE_CRITICAL_SEC; | |
383 | } | |
8258ef28 NJ |
384 | |
385 | if (ep->type == EXFAT_VENDOR_EXT) | |
386 | return TYPE_VENDOR_EXT; | |
387 | if (ep->type == EXFAT_VENDOR_ALLOC) | |
388 | return TYPE_VENDOR_ALLOC; | |
389 | ||
ca061973 NJ |
390 | return TYPE_BENIGN_SEC; |
391 | } | |
392 | ||
393 | static void exfat_set_entry_type(struct exfat_dentry *ep, unsigned int type) | |
394 | { | |
395 | if (type == TYPE_UNUSED) { | |
396 | ep->type = EXFAT_UNUSED; | |
397 | } else if (type == TYPE_DELETED) { | |
398 | ep->type &= EXFAT_DELETE; | |
399 | } else if (type == TYPE_STREAM) { | |
400 | ep->type = EXFAT_STREAM; | |
401 | } else if (type == TYPE_EXTEND) { | |
402 | ep->type = EXFAT_NAME; | |
403 | } else if (type == TYPE_BITMAP) { | |
404 | ep->type = EXFAT_BITMAP; | |
405 | } else if (type == TYPE_UPCASE) { | |
406 | ep->type = EXFAT_UPCASE; | |
407 | } else if (type == TYPE_VOLUME) { | |
408 | ep->type = EXFAT_VOLUME; | |
409 | } else if (type == TYPE_DIR) { | |
410 | ep->type = EXFAT_FILE; | |
411 | ep->dentry.file.attr = cpu_to_le16(ATTR_SUBDIR); | |
412 | } else if (type == TYPE_FILE) { | |
413 | ep->type = EXFAT_FILE; | |
414 | ep->dentry.file.attr = cpu_to_le16(ATTR_ARCHIVE); | |
415 | } | |
416 | } | |
417 | ||
418 | static void exfat_init_stream_entry(struct exfat_dentry *ep, | |
419 | unsigned char flags, unsigned int start_clu, | |
420 | unsigned long long size) | |
421 | { | |
422 | exfat_set_entry_type(ep, TYPE_STREAM); | |
423 | ep->dentry.stream.flags = flags; | |
424 | ep->dentry.stream.start_clu = cpu_to_le32(start_clu); | |
425 | ep->dentry.stream.valid_size = cpu_to_le64(size); | |
426 | ep->dentry.stream.size = cpu_to_le64(size); | |
427 | } | |
428 | ||
429 | static void exfat_init_name_entry(struct exfat_dentry *ep, | |
430 | unsigned short *uniname) | |
431 | { | |
432 | int i; | |
433 | ||
434 | exfat_set_entry_type(ep, TYPE_EXTEND); | |
435 | ep->dentry.name.flags = 0x0; | |
436 | ||
437 | for (i = 0; i < EXFAT_FILE_NAME_LEN; i++) { | |
4ba6ccd6 HK |
438 | if (*uniname != 0x0) { |
439 | ep->dentry.name.unicode_0_14[i] = cpu_to_le16(*uniname); | |
440 | uniname++; | |
441 | } else { | |
442 | ep->dentry.name.unicode_0_14[i] = 0x0; | |
443 | } | |
ca061973 NJ |
444 | } |
445 | } | |
446 | ||
447 | int exfat_init_dir_entry(struct inode *inode, struct exfat_chain *p_dir, | |
448 | int entry, unsigned int type, unsigned int start_clu, | |
449 | unsigned long long size) | |
450 | { | |
451 | struct super_block *sb = inode->i_sb; | |
452 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
453 | struct timespec64 ts = current_time(inode); | |
ca061973 NJ |
454 | struct exfat_dentry *ep; |
455 | struct buffer_head *bh; | |
456 | ||
457 | /* | |
458 | * We cannot use exfat_get_dentry_set here because file ep is not | |
459 | * initialized yet. | |
460 | */ | |
c71510b3 | 461 | ep = exfat_get_dentry(sb, p_dir, entry, &bh); |
ca061973 NJ |
462 | if (!ep) |
463 | return -EIO; | |
464 | ||
465 | exfat_set_entry_type(ep, type); | |
466 | exfat_set_entry_time(sbi, &ts, | |
467 | &ep->dentry.file.create_tz, | |
468 | &ep->dentry.file.create_time, | |
469 | &ep->dentry.file.create_date, | |
ed0f84d3 | 470 | &ep->dentry.file.create_time_cs); |
ca061973 NJ |
471 | exfat_set_entry_time(sbi, &ts, |
472 | &ep->dentry.file.modify_tz, | |
473 | &ep->dentry.file.modify_time, | |
474 | &ep->dentry.file.modify_date, | |
ed0f84d3 | 475 | &ep->dentry.file.modify_time_cs); |
ca061973 NJ |
476 | exfat_set_entry_time(sbi, &ts, |
477 | &ep->dentry.file.access_tz, | |
478 | &ep->dentry.file.access_time, | |
479 | &ep->dentry.file.access_date, | |
480 | NULL); | |
481 | ||
2c7f8937 | 482 | exfat_update_bh(bh, IS_DIRSYNC(inode)); |
ca061973 NJ |
483 | brelse(bh); |
484 | ||
c71510b3 | 485 | ep = exfat_get_dentry(sb, p_dir, entry + 1, &bh); |
ca061973 NJ |
486 | if (!ep) |
487 | return -EIO; | |
488 | ||
489 | exfat_init_stream_entry(ep, | |
490 | (type == TYPE_FILE) ? ALLOC_FAT_CHAIN : ALLOC_NO_FAT_CHAIN, | |
491 | start_clu, size); | |
2c7f8937 | 492 | exfat_update_bh(bh, IS_DIRSYNC(inode)); |
ca061973 NJ |
493 | brelse(bh); |
494 | ||
495 | return 0; | |
496 | } | |
497 | ||
498 | int exfat_update_dir_chksum(struct inode *inode, struct exfat_chain *p_dir, | |
499 | int entry) | |
500 | { | |
501 | struct super_block *sb = inode->i_sb; | |
502 | int ret = 0; | |
503 | int i, num_entries; | |
5875bf28 | 504 | u16 chksum; |
ca061973 NJ |
505 | struct exfat_dentry *ep, *fep; |
506 | struct buffer_head *fbh, *bh; | |
507 | ||
c71510b3 | 508 | fep = exfat_get_dentry(sb, p_dir, entry, &fbh); |
ca061973 NJ |
509 | if (!fep) |
510 | return -EIO; | |
511 | ||
512 | num_entries = fep->dentry.file.num_ext + 1; | |
5875bf28 | 513 | chksum = exfat_calc_chksum16(fep, DENTRY_SIZE, 0, CS_DIR_ENTRY); |
ca061973 NJ |
514 | |
515 | for (i = 1; i < num_entries; i++) { | |
c71510b3 | 516 | ep = exfat_get_dentry(sb, p_dir, entry + i, &bh); |
ca061973 NJ |
517 | if (!ep) { |
518 | ret = -EIO; | |
519 | goto release_fbh; | |
520 | } | |
5875bf28 | 521 | chksum = exfat_calc_chksum16(ep, DENTRY_SIZE, chksum, |
ca061973 NJ |
522 | CS_DEFAULT); |
523 | brelse(bh); | |
524 | } | |
525 | ||
526 | fep->dentry.file.checksum = cpu_to_le16(chksum); | |
2c7f8937 | 527 | exfat_update_bh(fbh, IS_DIRSYNC(inode)); |
ca061973 NJ |
528 | release_fbh: |
529 | brelse(fbh); | |
530 | return ret; | |
531 | } | |
532 | ||
8258ef28 NJ |
533 | static void exfat_free_benign_secondary_clusters(struct inode *inode, |
534 | struct exfat_dentry *ep) | |
535 | { | |
536 | struct super_block *sb = inode->i_sb; | |
537 | struct exfat_chain dir; | |
538 | unsigned int start_clu = | |
539 | le32_to_cpu(ep->dentry.generic_secondary.start_clu); | |
540 | u64 size = le64_to_cpu(ep->dentry.generic_secondary.size); | |
541 | unsigned char flags = ep->dentry.generic_secondary.flags; | |
542 | ||
543 | if (!(flags & ALLOC_POSSIBLE) || !start_clu || !size) | |
544 | return; | |
545 | ||
546 | exfat_chain_set(&dir, start_clu, | |
547 | EXFAT_B_TO_CLU_ROUND_UP(size, EXFAT_SB(sb)), | |
548 | flags); | |
549 | exfat_free_cluster(inode, &dir); | |
550 | } | |
551 | ||
ca061973 NJ |
552 | int exfat_init_ext_entry(struct inode *inode, struct exfat_chain *p_dir, |
553 | int entry, int num_entries, struct exfat_uni_name *p_uniname) | |
554 | { | |
555 | struct super_block *sb = inode->i_sb; | |
556 | int i; | |
ca061973 NJ |
557 | unsigned short *uniname = p_uniname->name; |
558 | struct exfat_dentry *ep; | |
559 | struct buffer_head *bh; | |
560 | int sync = IS_DIRSYNC(inode); | |
561 | ||
c71510b3 | 562 | ep = exfat_get_dentry(sb, p_dir, entry, &bh); |
ca061973 NJ |
563 | if (!ep) |
564 | return -EIO; | |
565 | ||
566 | ep->dentry.file.num_ext = (unsigned char)(num_entries - 1); | |
2c7f8937 | 567 | exfat_update_bh(bh, sync); |
ca061973 NJ |
568 | brelse(bh); |
569 | ||
c71510b3 | 570 | ep = exfat_get_dentry(sb, p_dir, entry + 1, &bh); |
ca061973 NJ |
571 | if (!ep) |
572 | return -EIO; | |
573 | ||
574 | ep->dentry.stream.name_len = p_uniname->name_len; | |
575 | ep->dentry.stream.name_hash = cpu_to_le16(p_uniname->name_hash); | |
2c7f8937 | 576 | exfat_update_bh(bh, sync); |
ca061973 NJ |
577 | brelse(bh); |
578 | ||
579 | for (i = EXFAT_FIRST_CLUSTER; i < num_entries; i++) { | |
c71510b3 | 580 | ep = exfat_get_dentry(sb, p_dir, entry + i, &bh); |
ca061973 NJ |
581 | if (!ep) |
582 | return -EIO; | |
583 | ||
8258ef28 NJ |
584 | if (exfat_get_entry_type(ep) & TYPE_BENIGN_SEC) |
585 | exfat_free_benign_secondary_clusters(inode, ep); | |
586 | ||
ca061973 | 587 | exfat_init_name_entry(ep, uniname); |
2c7f8937 | 588 | exfat_update_bh(bh, sync); |
ca061973 NJ |
589 | brelse(bh); |
590 | uniname += EXFAT_FILE_NAME_LEN; | |
591 | } | |
592 | ||
593 | exfat_update_dir_chksum(inode, p_dir, entry); | |
594 | return 0; | |
595 | } | |
596 | ||
597 | int exfat_remove_entries(struct inode *inode, struct exfat_chain *p_dir, | |
598 | int entry, int order, int num_entries) | |
599 | { | |
600 | struct super_block *sb = inode->i_sb; | |
601 | int i; | |
ca061973 NJ |
602 | struct exfat_dentry *ep; |
603 | struct buffer_head *bh; | |
604 | ||
605 | for (i = order; i < num_entries; i++) { | |
c71510b3 | 606 | ep = exfat_get_dentry(sb, p_dir, entry + i, &bh); |
ca061973 NJ |
607 | if (!ep) |
608 | return -EIO; | |
609 | ||
8258ef28 NJ |
610 | if (exfat_get_entry_type(ep) & TYPE_BENIGN_SEC) |
611 | exfat_free_benign_secondary_clusters(inode, ep); | |
612 | ||
ca061973 | 613 | exfat_set_entry_type(ep, TYPE_DELETED); |
2c7f8937 | 614 | exfat_update_bh(bh, IS_DIRSYNC(inode)); |
ca061973 NJ |
615 | brelse(bh); |
616 | } | |
617 | ||
618 | return 0; | |
619 | } | |
620 | ||
943af1fd | 621 | void exfat_update_dir_chksum_with_entry_set(struct exfat_entry_set_cache *es) |
ca061973 | 622 | { |
943af1fd | 623 | int chksum_type = CS_DIR_ENTRY, i; |
ca061973 | 624 | unsigned short chksum = 0; |
943af1fd | 625 | struct exfat_dentry *ep; |
ca061973 | 626 | |
f3fe3954 | 627 | for (i = ES_IDX_FILE; i < es->num_entries; i++) { |
943af1fd | 628 | ep = exfat_get_dentry_cached(es, i); |
5875bf28 TK |
629 | chksum = exfat_calc_chksum16(ep, DENTRY_SIZE, chksum, |
630 | chksum_type); | |
ca061973 NJ |
631 | chksum_type = CS_DEFAULT; |
632 | } | |
f3fe3954 | 633 | ep = exfat_get_dentry_cached(es, ES_IDX_FILE); |
943af1fd TK |
634 | ep->dentry.file.checksum = cpu_to_le16(chksum); |
635 | es->modified = true; | |
636 | } | |
ca061973 | 637 | |
3b9681ac | 638 | int exfat_put_dentry_set(struct exfat_entry_set_cache *es, int sync) |
943af1fd | 639 | { |
3db3c3fb | 640 | int i, err = 0; |
ca061973 | 641 | |
3db3c3fb TK |
642 | if (es->modified) |
643 | err = exfat_update_bhs(es->bh, es->num_bh, sync); | |
644 | ||
645 | for (i = 0; i < es->num_bh; i++) | |
646 | if (err) | |
647 | bforget(es->bh[i]); | |
648 | else | |
649 | brelse(es->bh[i]); | |
a3ff29a9 YM |
650 | |
651 | if (IS_DYNAMIC_ES(es)) | |
652 | kfree(es->bh); | |
653 | ||
8b0c4717 | 654 | return err; |
ca061973 NJ |
655 | } |
656 | ||
657 | static int exfat_walk_fat_chain(struct super_block *sb, | |
658 | struct exfat_chain *p_dir, unsigned int byte_offset, | |
659 | unsigned int *clu) | |
660 | { | |
661 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
662 | unsigned int clu_offset; | |
663 | unsigned int cur_clu; | |
664 | ||
665 | clu_offset = EXFAT_B_TO_CLU(byte_offset, sbi); | |
666 | cur_clu = p_dir->dir; | |
667 | ||
668 | if (p_dir->flags == ALLOC_NO_FAT_CHAIN) { | |
669 | cur_clu += clu_offset; | |
670 | } else { | |
671 | while (clu_offset > 0) { | |
672 | if (exfat_get_next_cluster(sb, &cur_clu)) | |
673 | return -EIO; | |
674 | if (cur_clu == EXFAT_EOF_CLUSTER) { | |
675 | exfat_fs_error(sb, | |
676 | "invalid dentry access beyond EOF (clu : %u, eidx : %d)", | |
677 | p_dir->dir, | |
678 | EXFAT_B_TO_DEN(byte_offset)); | |
679 | return -EIO; | |
680 | } | |
681 | clu_offset--; | |
682 | } | |
683 | } | |
684 | ||
685 | *clu = cur_clu; | |
686 | return 0; | |
687 | } | |
688 | ||
8cf05883 CVB |
689 | static int exfat_find_location(struct super_block *sb, struct exfat_chain *p_dir, |
690 | int entry, sector_t *sector, int *offset) | |
ca061973 NJ |
691 | { |
692 | int ret; | |
693 | unsigned int off, clu = 0; | |
694 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
695 | ||
696 | off = EXFAT_DEN_TO_B(entry); | |
697 | ||
698 | ret = exfat_walk_fat_chain(sb, p_dir, off, &clu); | |
699 | if (ret) | |
700 | return ret; | |
701 | ||
702 | /* byte offset in cluster */ | |
703 | off = EXFAT_CLU_OFFSET(off, sbi); | |
704 | ||
705 | /* byte offset in sector */ | |
706 | *offset = EXFAT_BLK_OFFSET(off, sb); | |
707 | ||
708 | /* sector offset in cluster */ | |
709 | *sector = EXFAT_B_TO_BLK(off, sb); | |
710 | *sector += exfat_cluster_to_sector(sbi, clu); | |
711 | return 0; | |
712 | } | |
713 | ||
714 | #define EXFAT_MAX_RA_SIZE (128*1024) | |
715 | static int exfat_dir_readahead(struct super_block *sb, sector_t sec) | |
716 | { | |
717 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
718 | struct buffer_head *bh; | |
719 | unsigned int max_ra_count = EXFAT_MAX_RA_SIZE >> sb->s_blocksize_bits; | |
720 | unsigned int page_ra_count = PAGE_SIZE >> sb->s_blocksize_bits; | |
721 | unsigned int adj_ra_count = max(sbi->sect_per_clus, page_ra_count); | |
722 | unsigned int ra_count = min(adj_ra_count, max_ra_count); | |
723 | ||
724 | /* Read-ahead is not required */ | |
725 | if (sbi->sect_per_clus == 1) | |
726 | return 0; | |
727 | ||
728 | if (sec < sbi->data_start_sector) { | |
d1727d55 JP |
729 | exfat_err(sb, "requested sector is invalid(sect:%llu, root:%llu)", |
730 | (unsigned long long)sec, sbi->data_start_sector); | |
ca061973 NJ |
731 | return -EIO; |
732 | } | |
733 | ||
734 | /* Not sector aligned with ra_count, resize ra_count to page size */ | |
735 | if ((sec - sbi->data_start_sector) & (ra_count - 1)) | |
736 | ra_count = page_ra_count; | |
737 | ||
738 | bh = sb_find_get_block(sb, sec); | |
739 | if (!bh || !buffer_uptodate(bh)) { | |
740 | unsigned int i; | |
741 | ||
742 | for (i = 0; i < ra_count; i++) | |
743 | sb_breadahead(sb, (sector_t)(sec + i)); | |
744 | } | |
745 | brelse(bh); | |
746 | return 0; | |
747 | } | |
748 | ||
749 | struct exfat_dentry *exfat_get_dentry(struct super_block *sb, | |
c71510b3 | 750 | struct exfat_chain *p_dir, int entry, struct buffer_head **bh) |
ca061973 NJ |
751 | { |
752 | unsigned int dentries_per_page = EXFAT_B_TO_DEN(PAGE_SIZE); | |
753 | int off; | |
754 | sector_t sec; | |
755 | ||
756 | if (p_dir->dir == DIR_DELETED) { | |
d1727d55 | 757 | exfat_err(sb, "abnormal access to deleted dentry"); |
ca061973 NJ |
758 | return NULL; |
759 | } | |
760 | ||
761 | if (exfat_find_location(sb, p_dir, entry, &sec, &off)) | |
762 | return NULL; | |
763 | ||
764 | if (p_dir->dir != EXFAT_FREE_CLUSTER && | |
765 | !(entry & (dentries_per_page - 1))) | |
766 | exfat_dir_readahead(sb, sec); | |
767 | ||
768 | *bh = sb_bread(sb, sec); | |
769 | if (!*bh) | |
770 | return NULL; | |
771 | ||
ca061973 NJ |
772 | return (struct exfat_dentry *)((*bh)->b_data + off); |
773 | } | |
774 | ||
775 | enum exfat_validate_dentry_mode { | |
776 | ES_MODE_STARTED, | |
777 | ES_MODE_GET_FILE_ENTRY, | |
778 | ES_MODE_GET_STRM_ENTRY, | |
779 | ES_MODE_GET_NAME_ENTRY, | |
780 | ES_MODE_GET_CRITICAL_SEC_ENTRY, | |
8258ef28 | 781 | ES_MODE_GET_BENIGN_SEC_ENTRY, |
ca061973 NJ |
782 | }; |
783 | ||
784 | static bool exfat_validate_entry(unsigned int type, | |
785 | enum exfat_validate_dentry_mode *mode) | |
786 | { | |
787 | if (type == TYPE_UNUSED || type == TYPE_DELETED) | |
788 | return false; | |
789 | ||
790 | switch (*mode) { | |
791 | case ES_MODE_STARTED: | |
792 | if (type != TYPE_FILE && type != TYPE_DIR) | |
793 | return false; | |
794 | *mode = ES_MODE_GET_FILE_ENTRY; | |
8258ef28 | 795 | break; |
ca061973 NJ |
796 | case ES_MODE_GET_FILE_ENTRY: |
797 | if (type != TYPE_STREAM) | |
798 | return false; | |
799 | *mode = ES_MODE_GET_STRM_ENTRY; | |
8258ef28 | 800 | break; |
ca061973 NJ |
801 | case ES_MODE_GET_STRM_ENTRY: |
802 | if (type != TYPE_EXTEND) | |
803 | return false; | |
804 | *mode = ES_MODE_GET_NAME_ENTRY; | |
8258ef28 | 805 | break; |
ca061973 | 806 | case ES_MODE_GET_NAME_ENTRY: |
8258ef28 NJ |
807 | if (type & TYPE_BENIGN_SEC) |
808 | *mode = ES_MODE_GET_BENIGN_SEC_ENTRY; | |
809 | else if (type != TYPE_EXTEND) | |
ca061973 | 810 | return false; |
8258ef28 NJ |
811 | break; |
812 | case ES_MODE_GET_BENIGN_SEC_ENTRY: | |
813 | /* Assume unreconized benign secondary entry */ | |
814 | if (!(type & TYPE_BENIGN_SEC)) | |
ca061973 | 815 | return false; |
8258ef28 | 816 | break; |
ca061973 | 817 | default: |
ca061973 NJ |
818 | return false; |
819 | } | |
8258ef28 NJ |
820 | |
821 | return true; | |
ca061973 NJ |
822 | } |
823 | ||
943af1fd TK |
824 | struct exfat_dentry *exfat_get_dentry_cached( |
825 | struct exfat_entry_set_cache *es, int num) | |
826 | { | |
827 | int off = es->start_off + num * DENTRY_SIZE; | |
828 | struct buffer_head *bh = es->bh[EXFAT_B_TO_BLK(off, es->sb)]; | |
829 | char *p = bh->b_data + EXFAT_BLK_OFFSET(off, es->sb); | |
830 | ||
831 | return (struct exfat_dentry *)p; | |
832 | } | |
833 | ||
ca061973 NJ |
834 | /* |
835 | * Returns a set of dentries for a file or dir. | |
836 | * | |
943af1fd TK |
837 | * Note It provides a direct pointer to bh->data via exfat_get_dentry_cached(). |
838 | * User should call exfat_get_dentry_set() after setting 'modified' to apply | |
839 | * changes made in this entry set to the real device. | |
ca061973 NJ |
840 | * |
841 | * in: | |
842 | * sb+p_dir+entry: indicates a file/dir | |
843 | * type: specifies how many dentries should be included. | |
ca061973 NJ |
844 | * return: |
845 | * pointer of entry set on success, | |
846 | * NULL on failure. | |
847 | */ | |
20914ff6 YM |
848 | int exfat_get_dentry_set(struct exfat_entry_set_cache *es, |
849 | struct super_block *sb, struct exfat_chain *p_dir, int entry, | |
850 | unsigned int type) | |
ca061973 | 851 | { |
943af1fd | 852 | int ret, i, num_bh; |
36955d36 | 853 | unsigned int off; |
ca061973 NJ |
854 | sector_t sec; |
855 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
943af1fd TK |
856 | struct exfat_dentry *ep; |
857 | int num_entries; | |
ca061973 NJ |
858 | enum exfat_validate_dentry_mode mode = ES_MODE_STARTED; |
859 | struct buffer_head *bh; | |
860 | ||
861 | if (p_dir->dir == DIR_DELETED) { | |
d1727d55 | 862 | exfat_err(sb, "access to deleted dentry"); |
20914ff6 | 863 | return -EIO; |
ca061973 NJ |
864 | } |
865 | ||
36955d36 | 866 | ret = exfat_find_location(sb, p_dir, entry, &sec, &off); |
ca061973 | 867 | if (ret) |
20914ff6 | 868 | return ret; |
ca061973 | 869 | |
20914ff6 | 870 | memset(es, 0, sizeof(*es)); |
943af1fd TK |
871 | es->sb = sb; |
872 | es->modified = false; | |
943af1fd | 873 | es->start_off = off; |
a3ff29a9 | 874 | es->bh = es->__bh; |
ca061973 | 875 | |
ca061973 NJ |
876 | bh = sb_bread(sb, sec); |
877 | if (!bh) | |
20914ff6 | 878 | return -EIO; |
943af1fd | 879 | es->bh[es->num_bh++] = bh; |
ca061973 | 880 | |
f3fe3954 | 881 | ep = exfat_get_dentry_cached(es, ES_IDX_FILE); |
943af1fd | 882 | if (!exfat_validate_entry(exfat_get_entry_type(ep), &mode)) |
3b9681ac | 883 | goto put_es; |
ca061973 NJ |
884 | |
885 | num_entries = type == ES_ALL_ENTRIES ? | |
886 | ep->dentry.file.num_ext + 1 : type; | |
ca061973 | 887 | es->num_entries = num_entries; |
ca061973 | 888 | |
943af1fd | 889 | num_bh = EXFAT_B_TO_BLK_ROUND_UP(off + num_entries * DENTRY_SIZE, sb); |
a3ff29a9 YM |
890 | if (num_bh > ARRAY_SIZE(es->__bh)) { |
891 | es->bh = kmalloc_array(num_bh, sizeof(*es->bh), GFP_KERNEL); | |
892 | if (!es->bh) { | |
893 | brelse(bh); | |
20914ff6 | 894 | return -ENOMEM; |
a3ff29a9 YM |
895 | } |
896 | es->bh[0] = bh; | |
897 | } | |
898 | ||
943af1fd TK |
899 | for (i = 1; i < num_bh; i++) { |
900 | /* get the next sector */ | |
901 | if (exfat_is_last_sector_in_cluster(sbi, sec)) { | |
36955d36 YM |
902 | unsigned int clu = exfat_sector_to_cluster(sbi, sec); |
903 | ||
943af1fd TK |
904 | if (p_dir->flags == ALLOC_NO_FAT_CHAIN) |
905 | clu++; | |
906 | else if (exfat_get_next_cluster(sb, &clu)) | |
3b9681ac | 907 | goto put_es; |
943af1fd | 908 | sec = exfat_cluster_to_sector(sbi, clu); |
ca061973 | 909 | } else { |
943af1fd | 910 | sec++; |
ca061973 | 911 | } |
943af1fd TK |
912 | |
913 | bh = sb_bread(sb, sec); | |
914 | if (!bh) | |
3b9681ac | 915 | goto put_es; |
943af1fd | 916 | es->bh[es->num_bh++] = bh; |
ca061973 NJ |
917 | } |
918 | ||
6fa96cd5 | 919 | /* validate cached dentries */ |
f3fe3954 | 920 | for (i = ES_IDX_STREAM; i < num_entries; i++) { |
943af1fd TK |
921 | ep = exfat_get_dentry_cached(es, i); |
922 | if (!exfat_validate_entry(exfat_get_entry_type(ep), &mode)) | |
3b9681ac | 923 | goto put_es; |
943af1fd | 924 | } |
20914ff6 | 925 | return 0; |
ca061973 | 926 | |
3b9681ac YM |
927 | put_es: |
928 | exfat_put_dentry_set(es, false); | |
20914ff6 | 929 | return -EIO; |
ca061973 NJ |
930 | } |
931 | ||
ff39899b YM |
932 | static inline void exfat_reset_empty_hint(struct exfat_hint_femp *hint_femp) |
933 | { | |
934 | hint_femp->eidx = EXFAT_HINT_NONE; | |
935 | hint_femp->count = 0; | |
936 | } | |
937 | ||
938 | static inline void exfat_set_empty_hint(struct exfat_inode_info *ei, | |
939 | struct exfat_hint_femp *candi_empty, struct exfat_chain *clu, | |
e298c8a8 | 940 | int dentry, int num_entries, int entry_type) |
ff39899b YM |
941 | { |
942 | if (ei->hint_femp.eidx == EXFAT_HINT_NONE || | |
943 | ei->hint_femp.eidx > dentry) { | |
e298c8a8 YM |
944 | int total_entries = EXFAT_B_TO_DEN(i_size_read(&ei->vfs_inode)); |
945 | ||
ff39899b YM |
946 | if (candi_empty->count == 0) { |
947 | candi_empty->cur = *clu; | |
948 | candi_empty->eidx = dentry; | |
949 | } | |
950 | ||
e298c8a8 YM |
951 | if (entry_type == TYPE_UNUSED) |
952 | candi_empty->count += total_entries - dentry; | |
953 | else | |
954 | candi_empty->count++; | |
955 | ||
956 | if (candi_empty->count == num_entries || | |
957 | candi_empty->count + candi_empty->eidx == total_entries) | |
ff39899b YM |
958 | ei->hint_femp = *candi_empty; |
959 | } | |
960 | } | |
961 | ||
ca061973 NJ |
962 | enum { |
963 | DIRENT_STEP_FILE, | |
964 | DIRENT_STEP_STRM, | |
965 | DIRENT_STEP_NAME, | |
966 | DIRENT_STEP_SECD, | |
967 | }; | |
968 | ||
969 | /* | |
c6e2f52e HK |
970 | * @ei: inode info of parent directory |
971 | * @p_dir: directory structure of parent directory | |
972 | * @num_entries:entry size of p_uniname | |
973 | * @hint_opt: If p_uniname is found, filled with optimized dir/entry | |
974 | * for traversing cluster chain. | |
975 | * @return: | |
976 | * >= 0: file directory entry position where the name exists | |
977 | * -ENOENT: entry with the name does not exist | |
978 | * -EIO: I/O error | |
ca061973 NJ |
979 | */ |
980 | int exfat_find_dir_entry(struct super_block *sb, struct exfat_inode_info *ei, | |
981 | struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname, | |
72880cb5 | 982 | struct exfat_hint *hint_opt) |
ca061973 NJ |
983 | { |
984 | int i, rewind = 0, dentry = 0, end_eidx = 0, num_ext = 0, len; | |
985 | int order, step, name_len = 0; | |
ff39899b | 986 | int dentries_per_clu; |
ca061973 NJ |
987 | unsigned int entry_type; |
988 | unsigned short *uniname = NULL; | |
989 | struct exfat_chain clu; | |
990 | struct exfat_hint *hint_stat = &ei->hint_stat; | |
991 | struct exfat_hint_femp candi_empty; | |
992 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
72880cb5 YM |
993 | int num_entries = exfat_calc_num_entries(p_uniname); |
994 | ||
995 | if (num_entries < 0) | |
996 | return num_entries; | |
ca061973 NJ |
997 | |
998 | dentries_per_clu = sbi->dentries_per_clu; | |
999 | ||
1000 | exfat_chain_dup(&clu, p_dir); | |
1001 | ||
1002 | if (hint_stat->eidx) { | |
1003 | clu.dir = hint_stat->clu; | |
1004 | dentry = hint_stat->eidx; | |
1005 | end_eidx = dentry; | |
1006 | } | |
1007 | ||
ff39899b YM |
1008 | exfat_reset_empty_hint(&ei->hint_femp); |
1009 | ||
ca061973 NJ |
1010 | rewind: |
1011 | order = 0; | |
1012 | step = DIRENT_STEP_FILE; | |
ff39899b YM |
1013 | exfat_reset_empty_hint(&candi_empty); |
1014 | ||
ca061973 NJ |
1015 | while (clu.dir != EXFAT_EOF_CLUSTER) { |
1016 | i = dentry & (dentries_per_clu - 1); | |
1017 | for (; i < dentries_per_clu; i++, dentry++) { | |
1018 | struct exfat_dentry *ep; | |
1019 | struct buffer_head *bh; | |
1020 | ||
1021 | if (rewind && dentry == end_eidx) | |
1022 | goto not_found; | |
1023 | ||
c71510b3 | 1024 | ep = exfat_get_dentry(sb, &clu, i, &bh); |
ca061973 NJ |
1025 | if (!ep) |
1026 | return -EIO; | |
1027 | ||
1028 | entry_type = exfat_get_entry_type(ep); | |
1029 | ||
1030 | if (entry_type == TYPE_UNUSED || | |
1031 | entry_type == TYPE_DELETED) { | |
1032 | step = DIRENT_STEP_FILE; | |
1033 | ||
ff39899b | 1034 | exfat_set_empty_hint(ei, &candi_empty, &clu, |
e298c8a8 YM |
1035 | dentry, num_entries, |
1036 | entry_type); | |
ca061973 NJ |
1037 | |
1038 | brelse(bh); | |
1039 | if (entry_type == TYPE_UNUSED) | |
1040 | goto not_found; | |
1041 | continue; | |
1042 | } | |
1043 | ||
ff39899b | 1044 | exfat_reset_empty_hint(&candi_empty); |
ca061973 NJ |
1045 | |
1046 | if (entry_type == TYPE_FILE || entry_type == TYPE_DIR) { | |
1047 | step = DIRENT_STEP_FILE; | |
c6e2f52e HK |
1048 | hint_opt->clu = clu.dir; |
1049 | hint_opt->eidx = i; | |
72880cb5 YM |
1050 | num_ext = ep->dentry.file.num_ext; |
1051 | step = DIRENT_STEP_STRM; | |
ca061973 NJ |
1052 | brelse(bh); |
1053 | continue; | |
1054 | } | |
1055 | ||
1056 | if (entry_type == TYPE_STREAM) { | |
5875bf28 | 1057 | u16 name_hash; |
ca061973 NJ |
1058 | |
1059 | if (step != DIRENT_STEP_STRM) { | |
1060 | step = DIRENT_STEP_FILE; | |
1061 | brelse(bh); | |
1062 | continue; | |
1063 | } | |
1064 | step = DIRENT_STEP_FILE; | |
1065 | name_hash = le16_to_cpu( | |
1066 | ep->dentry.stream.name_hash); | |
1067 | if (p_uniname->name_hash == name_hash && | |
1068 | p_uniname->name_len == | |
1069 | ep->dentry.stream.name_len) { | |
1070 | step = DIRENT_STEP_NAME; | |
1071 | order = 1; | |
1072 | name_len = 0; | |
1073 | } | |
1074 | brelse(bh); | |
1075 | continue; | |
1076 | } | |
1077 | ||
1078 | brelse(bh); | |
1079 | if (entry_type == TYPE_EXTEND) { | |
1080 | unsigned short entry_uniname[16], unichar; | |
1081 | ||
1082 | if (step != DIRENT_STEP_NAME) { | |
1083 | step = DIRENT_STEP_FILE; | |
1084 | continue; | |
1085 | } | |
1086 | ||
1087 | if (++order == 2) | |
1088 | uniname = p_uniname->name; | |
1089 | else | |
1090 | uniname += EXFAT_FILE_NAME_LEN; | |
1091 | ||
1092 | len = exfat_extract_uni_name(ep, entry_uniname); | |
1093 | name_len += len; | |
1094 | ||
1095 | unichar = *(uniname+len); | |
1096 | *(uniname+len) = 0x0; | |
1097 | ||
1098 | if (exfat_uniname_ncmp(sb, uniname, | |
1099 | entry_uniname, len)) { | |
1100 | step = DIRENT_STEP_FILE; | |
1101 | } else if (p_uniname->name_len == name_len) { | |
1102 | if (order == num_ext) | |
1103 | goto found; | |
1104 | step = DIRENT_STEP_SECD; | |
1105 | } | |
1106 | ||
1107 | *(uniname+len) = unichar; | |
1108 | continue; | |
1109 | } | |
1110 | ||
1111 | if (entry_type & | |
1112 | (TYPE_CRITICAL_SEC | TYPE_BENIGN_SEC)) { | |
1113 | if (step == DIRENT_STEP_SECD) { | |
1114 | if (++order == num_ext) | |
1115 | goto found; | |
1116 | continue; | |
1117 | } | |
1118 | } | |
1119 | step = DIRENT_STEP_FILE; | |
1120 | } | |
1121 | ||
1122 | if (clu.flags == ALLOC_NO_FAT_CHAIN) { | |
1123 | if (--clu.size > 0) | |
1124 | clu.dir++; | |
1125 | else | |
1126 | clu.dir = EXFAT_EOF_CLUSTER; | |
1127 | } else { | |
1128 | if (exfat_get_next_cluster(sb, &clu.dir)) | |
1129 | return -EIO; | |
1130 | } | |
1131 | } | |
1132 | ||
1133 | not_found: | |
1134 | /* | |
1135 | * We started at not 0 index,so we should try to find target | |
1136 | * from 0 index to the index we started at. | |
1137 | */ | |
1138 | if (!rewind && end_eidx) { | |
1139 | rewind = 1; | |
1140 | dentry = 0; | |
1141 | clu.dir = p_dir->dir; | |
ca061973 NJ |
1142 | goto rewind; |
1143 | } | |
1144 | ||
e298c8a8 YM |
1145 | /* |
1146 | * set the EXFAT_EOF_CLUSTER flag to avoid search | |
1147 | * from the beginning again when allocated a new cluster | |
1148 | */ | |
1149 | if (ei->hint_femp.eidx == EXFAT_HINT_NONE) { | |
1150 | ei->hint_femp.cur.dir = EXFAT_EOF_CLUSTER; | |
1151 | ei->hint_femp.eidx = p_dir->size * dentries_per_clu; | |
1152 | ei->hint_femp.count = 0; | |
1153 | } | |
1154 | ||
ca061973 NJ |
1155 | /* initialized hint_stat */ |
1156 | hint_stat->clu = p_dir->dir; | |
1157 | hint_stat->eidx = 0; | |
1158 | return -ENOENT; | |
1159 | ||
1160 | found: | |
1161 | /* next dentry we'll find is out of this cluster */ | |
1162 | if (!((dentry + 1) & (dentries_per_clu - 1))) { | |
1163 | int ret = 0; | |
1164 | ||
1165 | if (clu.flags == ALLOC_NO_FAT_CHAIN) { | |
1166 | if (--clu.size > 0) | |
1167 | clu.dir++; | |
1168 | else | |
1169 | clu.dir = EXFAT_EOF_CLUSTER; | |
1170 | } else { | |
1171 | ret = exfat_get_next_cluster(sb, &clu.dir); | |
1172 | } | |
1173 | ||
d2fa0c33 | 1174 | if (ret || clu.dir == EXFAT_EOF_CLUSTER) { |
ca061973 NJ |
1175 | /* just initialized hint_stat */ |
1176 | hint_stat->clu = p_dir->dir; | |
1177 | hint_stat->eidx = 0; | |
1178 | return (dentry - num_ext); | |
1179 | } | |
1180 | } | |
1181 | ||
1182 | hint_stat->clu = clu.dir; | |
1183 | hint_stat->eidx = dentry + 1; | |
1184 | return dentry - num_ext; | |
1185 | } | |
1186 | ||
1187 | int exfat_count_ext_entries(struct super_block *sb, struct exfat_chain *p_dir, | |
1188 | int entry, struct exfat_dentry *ep) | |
1189 | { | |
1190 | int i, count = 0; | |
1191 | unsigned int type; | |
1192 | struct exfat_dentry *ext_ep; | |
1193 | struct buffer_head *bh; | |
1194 | ||
1195 | for (i = 0, entry++; i < ep->dentry.file.num_ext; i++, entry++) { | |
c71510b3 | 1196 | ext_ep = exfat_get_dentry(sb, p_dir, entry, &bh); |
ca061973 NJ |
1197 | if (!ext_ep) |
1198 | return -EIO; | |
1199 | ||
1200 | type = exfat_get_entry_type(ext_ep); | |
1201 | brelse(bh); | |
8258ef28 | 1202 | if (type & TYPE_CRITICAL_SEC || type & TYPE_BENIGN_SEC) |
ca061973 | 1203 | count++; |
ca061973 NJ |
1204 | } |
1205 | return count; | |
1206 | } | |
1207 | ||
1208 | int exfat_count_dir_entries(struct super_block *sb, struct exfat_chain *p_dir) | |
1209 | { | |
1210 | int i, count = 0; | |
1211 | int dentries_per_clu; | |
1212 | unsigned int entry_type; | |
1213 | struct exfat_chain clu; | |
1214 | struct exfat_dentry *ep; | |
1215 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
1216 | struct buffer_head *bh; | |
1217 | ||
1218 | dentries_per_clu = sbi->dentries_per_clu; | |
1219 | ||
1220 | exfat_chain_dup(&clu, p_dir); | |
1221 | ||
1222 | while (clu.dir != EXFAT_EOF_CLUSTER) { | |
1223 | for (i = 0; i < dentries_per_clu; i++) { | |
c71510b3 | 1224 | ep = exfat_get_dentry(sb, &clu, i, &bh); |
ca061973 NJ |
1225 | if (!ep) |
1226 | return -EIO; | |
1227 | entry_type = exfat_get_entry_type(ep); | |
1228 | brelse(bh); | |
1229 | ||
1230 | if (entry_type == TYPE_UNUSED) | |
1231 | return count; | |
1232 | if (entry_type != TYPE_DIR) | |
1233 | continue; | |
1234 | count++; | |
1235 | } | |
1236 | ||
1237 | if (clu.flags == ALLOC_NO_FAT_CHAIN) { | |
1238 | if (--clu.size > 0) | |
1239 | clu.dir++; | |
1240 | else | |
1241 | clu.dir = EXFAT_EOF_CLUSTER; | |
1242 | } else { | |
1243 | if (exfat_get_next_cluster(sb, &(clu.dir))) | |
1244 | return -EIO; | |
1245 | } | |
1246 | } | |
1247 | ||
1248 | return count; | |
1249 | } |