Commit | Line | Data |
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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 | ||
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; |
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 | 68 | static 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 | ||
197 | static void exfat_init_namebuf(struct exfat_dentry_namebuf *nb) | |
198 | { | |
199 | nb->lfn = NULL; | |
200 | nb->lfnbuf_len = 0; | |
201 | } | |
202 | ||
203 | static 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 | ||
212 | static 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 | 226 | static 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 | 255 | get_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 | ||
295 | end_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 | 300 | out: |
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 | 309 | WRAP_DIR_ITER(exfat_iterate) // FIXME! |
ca061973 NJ |
310 | const 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 | ||
321 | int 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 | ||
334 | int 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 | ||
346 | unsigned 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 | ||
395 | static 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 | ||
420 | static 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 | ||
433 | static 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 | ||
451 | int exfat_init_dir_entry(struct inode *inode, struct exfat_chain *p_dir, | |
452 | int entry, unsigned int type, unsigned int start_clu, | |
453 | unsigned long long size) | |
454 | { | |
455 | struct super_block *sb = inode->i_sb; | |
456 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
457 | struct timespec64 ts = current_time(inode); | |
ca061973 NJ |
458 | struct exfat_dentry *ep; |
459 | struct buffer_head *bh; | |
460 | ||
461 | /* | |
462 | * We cannot use exfat_get_dentry_set here because file ep is not | |
463 | * initialized yet. | |
464 | */ | |
c71510b3 | 465 | ep = exfat_get_dentry(sb, p_dir, entry, &bh); |
ca061973 NJ |
466 | if (!ep) |
467 | return -EIO; | |
468 | ||
469 | exfat_set_entry_type(ep, type); | |
470 | exfat_set_entry_time(sbi, &ts, | |
471 | &ep->dentry.file.create_tz, | |
472 | &ep->dentry.file.create_time, | |
473 | &ep->dentry.file.create_date, | |
ed0f84d3 | 474 | &ep->dentry.file.create_time_cs); |
ca061973 NJ |
475 | exfat_set_entry_time(sbi, &ts, |
476 | &ep->dentry.file.modify_tz, | |
477 | &ep->dentry.file.modify_time, | |
478 | &ep->dentry.file.modify_date, | |
ed0f84d3 | 479 | &ep->dentry.file.modify_time_cs); |
ca061973 NJ |
480 | exfat_set_entry_time(sbi, &ts, |
481 | &ep->dentry.file.access_tz, | |
482 | &ep->dentry.file.access_time, | |
483 | &ep->dentry.file.access_date, | |
484 | NULL); | |
485 | ||
2c7f8937 | 486 | exfat_update_bh(bh, IS_DIRSYNC(inode)); |
ca061973 NJ |
487 | brelse(bh); |
488 | ||
c71510b3 | 489 | ep = exfat_get_dentry(sb, p_dir, entry + 1, &bh); |
ca061973 NJ |
490 | if (!ep) |
491 | return -EIO; | |
492 | ||
ee785c15 | 493 | exfat_init_stream_entry(ep, start_clu, size); |
2c7f8937 | 494 | exfat_update_bh(bh, IS_DIRSYNC(inode)); |
ca061973 NJ |
495 | brelse(bh); |
496 | ||
497 | return 0; | |
498 | } | |
499 | ||
500 | int exfat_update_dir_chksum(struct inode *inode, struct exfat_chain *p_dir, | |
501 | int entry) | |
502 | { | |
503 | struct super_block *sb = inode->i_sb; | |
504 | int ret = 0; | |
505 | int i, num_entries; | |
5875bf28 | 506 | u16 chksum; |
ca061973 NJ |
507 | struct exfat_dentry *ep, *fep; |
508 | struct buffer_head *fbh, *bh; | |
509 | ||
c71510b3 | 510 | fep = exfat_get_dentry(sb, p_dir, entry, &fbh); |
ca061973 NJ |
511 | if (!fep) |
512 | return -EIO; | |
513 | ||
514 | num_entries = fep->dentry.file.num_ext + 1; | |
5875bf28 | 515 | chksum = exfat_calc_chksum16(fep, DENTRY_SIZE, 0, CS_DIR_ENTRY); |
ca061973 NJ |
516 | |
517 | for (i = 1; i < num_entries; i++) { | |
c71510b3 | 518 | ep = exfat_get_dentry(sb, p_dir, entry + i, &bh); |
ca061973 NJ |
519 | if (!ep) { |
520 | ret = -EIO; | |
521 | goto release_fbh; | |
522 | } | |
5875bf28 | 523 | chksum = exfat_calc_chksum16(ep, DENTRY_SIZE, chksum, |
ca061973 NJ |
524 | CS_DEFAULT); |
525 | brelse(bh); | |
526 | } | |
527 | ||
528 | fep->dentry.file.checksum = cpu_to_le16(chksum); | |
2c7f8937 | 529 | exfat_update_bh(fbh, IS_DIRSYNC(inode)); |
ca061973 NJ |
530 | release_fbh: |
531 | brelse(fbh); | |
532 | return ret; | |
533 | } | |
534 | ||
8258ef28 NJ |
535 | static void exfat_free_benign_secondary_clusters(struct inode *inode, |
536 | struct exfat_dentry *ep) | |
537 | { | |
538 | struct super_block *sb = inode->i_sb; | |
539 | struct exfat_chain dir; | |
540 | unsigned int start_clu = | |
541 | le32_to_cpu(ep->dentry.generic_secondary.start_clu); | |
542 | u64 size = le64_to_cpu(ep->dentry.generic_secondary.size); | |
543 | unsigned char flags = ep->dentry.generic_secondary.flags; | |
544 | ||
545 | if (!(flags & ALLOC_POSSIBLE) || !start_clu || !size) | |
546 | return; | |
547 | ||
548 | exfat_chain_set(&dir, start_clu, | |
549 | EXFAT_B_TO_CLU_ROUND_UP(size, EXFAT_SB(sb)), | |
550 | flags); | |
551 | exfat_free_cluster(inode, &dir); | |
552 | } | |
553 | ||
ca061973 NJ |
554 | int exfat_init_ext_entry(struct inode *inode, struct exfat_chain *p_dir, |
555 | int entry, int num_entries, struct exfat_uni_name *p_uniname) | |
556 | { | |
557 | struct super_block *sb = inode->i_sb; | |
558 | int i; | |
ca061973 NJ |
559 | unsigned short *uniname = p_uniname->name; |
560 | struct exfat_dentry *ep; | |
561 | struct buffer_head *bh; | |
562 | int sync = IS_DIRSYNC(inode); | |
563 | ||
c71510b3 | 564 | ep = exfat_get_dentry(sb, p_dir, entry, &bh); |
ca061973 NJ |
565 | if (!ep) |
566 | return -EIO; | |
567 | ||
568 | ep->dentry.file.num_ext = (unsigned char)(num_entries - 1); | |
2c7f8937 | 569 | exfat_update_bh(bh, sync); |
ca061973 NJ |
570 | brelse(bh); |
571 | ||
c71510b3 | 572 | ep = exfat_get_dentry(sb, p_dir, entry + 1, &bh); |
ca061973 NJ |
573 | if (!ep) |
574 | return -EIO; | |
575 | ||
576 | ep->dentry.stream.name_len = p_uniname->name_len; | |
577 | ep->dentry.stream.name_hash = cpu_to_le16(p_uniname->name_hash); | |
2c7f8937 | 578 | exfat_update_bh(bh, sync); |
ca061973 NJ |
579 | brelse(bh); |
580 | ||
581 | for (i = EXFAT_FIRST_CLUSTER; i < num_entries; i++) { | |
c71510b3 | 582 | ep = exfat_get_dentry(sb, p_dir, entry + i, &bh); |
ca061973 NJ |
583 | if (!ep) |
584 | return -EIO; | |
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_init_name_entry(ep, uniname); |
2c7f8937 | 590 | exfat_update_bh(bh, sync); |
ca061973 NJ |
591 | brelse(bh); |
592 | uniname += EXFAT_FILE_NAME_LEN; | |
593 | } | |
594 | ||
595 | exfat_update_dir_chksum(inode, p_dir, entry); | |
596 | return 0; | |
597 | } | |
598 | ||
599 | int exfat_remove_entries(struct inode *inode, struct exfat_chain *p_dir, | |
600 | int entry, int order, int num_entries) | |
601 | { | |
602 | struct super_block *sb = inode->i_sb; | |
603 | int i; | |
ca061973 NJ |
604 | struct exfat_dentry *ep; |
605 | struct buffer_head *bh; | |
606 | ||
607 | for (i = order; i < num_entries; i++) { | |
c71510b3 | 608 | ep = exfat_get_dentry(sb, p_dir, entry + i, &bh); |
ca061973 NJ |
609 | if (!ep) |
610 | return -EIO; | |
611 | ||
8258ef28 NJ |
612 | if (exfat_get_entry_type(ep) & TYPE_BENIGN_SEC) |
613 | exfat_free_benign_secondary_clusters(inode, ep); | |
614 | ||
ca061973 | 615 | exfat_set_entry_type(ep, TYPE_DELETED); |
2c7f8937 | 616 | exfat_update_bh(bh, IS_DIRSYNC(inode)); |
ca061973 NJ |
617 | brelse(bh); |
618 | } | |
619 | ||
620 | return 0; | |
621 | } | |
622 | ||
943af1fd | 623 | void exfat_update_dir_chksum_with_entry_set(struct exfat_entry_set_cache *es) |
ca061973 | 624 | { |
943af1fd | 625 | int chksum_type = CS_DIR_ENTRY, i; |
ca061973 | 626 | unsigned short chksum = 0; |
943af1fd | 627 | struct exfat_dentry *ep; |
ca061973 | 628 | |
f3fe3954 | 629 | for (i = ES_IDX_FILE; i < es->num_entries; i++) { |
943af1fd | 630 | ep = exfat_get_dentry_cached(es, i); |
5875bf28 TK |
631 | chksum = exfat_calc_chksum16(ep, DENTRY_SIZE, chksum, |
632 | chksum_type); | |
ca061973 NJ |
633 | chksum_type = CS_DEFAULT; |
634 | } | |
f3fe3954 | 635 | ep = exfat_get_dentry_cached(es, ES_IDX_FILE); |
943af1fd TK |
636 | ep->dentry.file.checksum = cpu_to_le16(chksum); |
637 | es->modified = true; | |
638 | } | |
ca061973 | 639 | |
3b9681ac | 640 | int exfat_put_dentry_set(struct exfat_entry_set_cache *es, int sync) |
943af1fd | 641 | { |
3db3c3fb | 642 | int i, err = 0; |
ca061973 | 643 | |
3db3c3fb TK |
644 | if (es->modified) |
645 | err = exfat_update_bhs(es->bh, es->num_bh, sync); | |
646 | ||
647 | for (i = 0; i < es->num_bh; i++) | |
648 | if (err) | |
649 | bforget(es->bh[i]); | |
650 | else | |
651 | brelse(es->bh[i]); | |
a3ff29a9 YM |
652 | |
653 | if (IS_DYNAMIC_ES(es)) | |
654 | kfree(es->bh); | |
655 | ||
8b0c4717 | 656 | return err; |
ca061973 NJ |
657 | } |
658 | ||
659 | static int exfat_walk_fat_chain(struct super_block *sb, | |
660 | struct exfat_chain *p_dir, unsigned int byte_offset, | |
661 | unsigned int *clu) | |
662 | { | |
663 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
664 | unsigned int clu_offset; | |
665 | unsigned int cur_clu; | |
666 | ||
667 | clu_offset = EXFAT_B_TO_CLU(byte_offset, sbi); | |
668 | cur_clu = p_dir->dir; | |
669 | ||
670 | if (p_dir->flags == ALLOC_NO_FAT_CHAIN) { | |
671 | cur_clu += clu_offset; | |
672 | } else { | |
673 | while (clu_offset > 0) { | |
674 | if (exfat_get_next_cluster(sb, &cur_clu)) | |
675 | return -EIO; | |
676 | if (cur_clu == EXFAT_EOF_CLUSTER) { | |
677 | exfat_fs_error(sb, | |
678 | "invalid dentry access beyond EOF (clu : %u, eidx : %d)", | |
679 | p_dir->dir, | |
680 | EXFAT_B_TO_DEN(byte_offset)); | |
681 | return -EIO; | |
682 | } | |
683 | clu_offset--; | |
684 | } | |
685 | } | |
686 | ||
687 | *clu = cur_clu; | |
688 | return 0; | |
689 | } | |
690 | ||
8cf05883 CVB |
691 | static int exfat_find_location(struct super_block *sb, struct exfat_chain *p_dir, |
692 | int entry, sector_t *sector, int *offset) | |
ca061973 NJ |
693 | { |
694 | int ret; | |
695 | unsigned int off, clu = 0; | |
696 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
697 | ||
698 | off = EXFAT_DEN_TO_B(entry); | |
699 | ||
700 | ret = exfat_walk_fat_chain(sb, p_dir, off, &clu); | |
701 | if (ret) | |
702 | return ret; | |
703 | ||
704 | /* byte offset in cluster */ | |
705 | off = EXFAT_CLU_OFFSET(off, sbi); | |
706 | ||
707 | /* byte offset in sector */ | |
708 | *offset = EXFAT_BLK_OFFSET(off, sb); | |
709 | ||
710 | /* sector offset in cluster */ | |
711 | *sector = EXFAT_B_TO_BLK(off, sb); | |
712 | *sector += exfat_cluster_to_sector(sbi, clu); | |
713 | return 0; | |
714 | } | |
715 | ||
716 | #define EXFAT_MAX_RA_SIZE (128*1024) | |
717 | static int exfat_dir_readahead(struct super_block *sb, sector_t sec) | |
718 | { | |
719 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
720 | struct buffer_head *bh; | |
721 | unsigned int max_ra_count = EXFAT_MAX_RA_SIZE >> sb->s_blocksize_bits; | |
722 | unsigned int page_ra_count = PAGE_SIZE >> sb->s_blocksize_bits; | |
723 | unsigned int adj_ra_count = max(sbi->sect_per_clus, page_ra_count); | |
724 | unsigned int ra_count = min(adj_ra_count, max_ra_count); | |
725 | ||
726 | /* Read-ahead is not required */ | |
727 | if (sbi->sect_per_clus == 1) | |
728 | return 0; | |
729 | ||
730 | if (sec < sbi->data_start_sector) { | |
d1727d55 JP |
731 | exfat_err(sb, "requested sector is invalid(sect:%llu, root:%llu)", |
732 | (unsigned long long)sec, sbi->data_start_sector); | |
ca061973 NJ |
733 | return -EIO; |
734 | } | |
735 | ||
736 | /* Not sector aligned with ra_count, resize ra_count to page size */ | |
737 | if ((sec - sbi->data_start_sector) & (ra_count - 1)) | |
738 | ra_count = page_ra_count; | |
739 | ||
740 | bh = sb_find_get_block(sb, sec); | |
741 | if (!bh || !buffer_uptodate(bh)) { | |
742 | unsigned int i; | |
743 | ||
744 | for (i = 0; i < ra_count; i++) | |
745 | sb_breadahead(sb, (sector_t)(sec + i)); | |
746 | } | |
747 | brelse(bh); | |
748 | return 0; | |
749 | } | |
750 | ||
751 | struct exfat_dentry *exfat_get_dentry(struct super_block *sb, | |
c71510b3 | 752 | struct exfat_chain *p_dir, int entry, struct buffer_head **bh) |
ca061973 NJ |
753 | { |
754 | unsigned int dentries_per_page = EXFAT_B_TO_DEN(PAGE_SIZE); | |
755 | int off; | |
756 | sector_t sec; | |
757 | ||
758 | if (p_dir->dir == DIR_DELETED) { | |
d1727d55 | 759 | exfat_err(sb, "abnormal access to deleted dentry"); |
ca061973 NJ |
760 | return NULL; |
761 | } | |
762 | ||
763 | if (exfat_find_location(sb, p_dir, entry, &sec, &off)) | |
764 | return NULL; | |
765 | ||
766 | if (p_dir->dir != EXFAT_FREE_CLUSTER && | |
767 | !(entry & (dentries_per_page - 1))) | |
768 | exfat_dir_readahead(sb, sec); | |
769 | ||
770 | *bh = sb_bread(sb, sec); | |
771 | if (!*bh) | |
772 | return NULL; | |
773 | ||
ca061973 NJ |
774 | return (struct exfat_dentry *)((*bh)->b_data + off); |
775 | } | |
776 | ||
777 | enum exfat_validate_dentry_mode { | |
778 | ES_MODE_STARTED, | |
779 | ES_MODE_GET_FILE_ENTRY, | |
780 | ES_MODE_GET_STRM_ENTRY, | |
781 | ES_MODE_GET_NAME_ENTRY, | |
782 | ES_MODE_GET_CRITICAL_SEC_ENTRY, | |
8258ef28 | 783 | ES_MODE_GET_BENIGN_SEC_ENTRY, |
ca061973 NJ |
784 | }; |
785 | ||
786 | static bool exfat_validate_entry(unsigned int type, | |
787 | enum exfat_validate_dentry_mode *mode) | |
788 | { | |
789 | if (type == TYPE_UNUSED || type == TYPE_DELETED) | |
790 | return false; | |
791 | ||
792 | switch (*mode) { | |
793 | case ES_MODE_STARTED: | |
794 | if (type != TYPE_FILE && type != TYPE_DIR) | |
795 | return false; | |
796 | *mode = ES_MODE_GET_FILE_ENTRY; | |
8258ef28 | 797 | break; |
ca061973 NJ |
798 | case ES_MODE_GET_FILE_ENTRY: |
799 | if (type != TYPE_STREAM) | |
800 | return false; | |
801 | *mode = ES_MODE_GET_STRM_ENTRY; | |
8258ef28 | 802 | break; |
ca061973 NJ |
803 | case ES_MODE_GET_STRM_ENTRY: |
804 | if (type != TYPE_EXTEND) | |
805 | return false; | |
806 | *mode = ES_MODE_GET_NAME_ENTRY; | |
8258ef28 | 807 | break; |
ca061973 | 808 | case ES_MODE_GET_NAME_ENTRY: |
8258ef28 NJ |
809 | if (type & TYPE_BENIGN_SEC) |
810 | *mode = ES_MODE_GET_BENIGN_SEC_ENTRY; | |
811 | else if (type != TYPE_EXTEND) | |
ca061973 | 812 | return false; |
8258ef28 NJ |
813 | break; |
814 | case ES_MODE_GET_BENIGN_SEC_ENTRY: | |
815 | /* Assume unreconized benign secondary entry */ | |
816 | if (!(type & TYPE_BENIGN_SEC)) | |
ca061973 | 817 | return false; |
8258ef28 | 818 | break; |
ca061973 | 819 | default: |
ca061973 NJ |
820 | return false; |
821 | } | |
8258ef28 NJ |
822 | |
823 | return true; | |
ca061973 NJ |
824 | } |
825 | ||
943af1fd TK |
826 | struct exfat_dentry *exfat_get_dentry_cached( |
827 | struct exfat_entry_set_cache *es, int num) | |
828 | { | |
829 | int off = es->start_off + num * DENTRY_SIZE; | |
830 | struct buffer_head *bh = es->bh[EXFAT_B_TO_BLK(off, es->sb)]; | |
831 | char *p = bh->b_data + EXFAT_BLK_OFFSET(off, es->sb); | |
832 | ||
833 | return (struct exfat_dentry *)p; | |
834 | } | |
835 | ||
ca061973 NJ |
836 | /* |
837 | * Returns a set of dentries for a file or dir. | |
838 | * | |
943af1fd TK |
839 | * Note It provides a direct pointer to bh->data via exfat_get_dentry_cached(). |
840 | * User should call exfat_get_dentry_set() after setting 'modified' to apply | |
841 | * changes made in this entry set to the real device. | |
ca061973 NJ |
842 | * |
843 | * in: | |
844 | * sb+p_dir+entry: indicates a file/dir | |
845 | * type: specifies how many dentries should be included. | |
ca061973 NJ |
846 | * return: |
847 | * pointer of entry set on success, | |
848 | * NULL on failure. | |
849 | */ | |
20914ff6 YM |
850 | int exfat_get_dentry_set(struct exfat_entry_set_cache *es, |
851 | struct super_block *sb, struct exfat_chain *p_dir, int entry, | |
852 | unsigned int type) | |
ca061973 | 853 | { |
943af1fd | 854 | int ret, i, num_bh; |
36955d36 | 855 | unsigned int off; |
ca061973 NJ |
856 | sector_t sec; |
857 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
943af1fd TK |
858 | struct exfat_dentry *ep; |
859 | int num_entries; | |
ca061973 NJ |
860 | enum exfat_validate_dentry_mode mode = ES_MODE_STARTED; |
861 | struct buffer_head *bh; | |
862 | ||
863 | if (p_dir->dir == DIR_DELETED) { | |
d1727d55 | 864 | exfat_err(sb, "access to deleted dentry"); |
20914ff6 | 865 | return -EIO; |
ca061973 NJ |
866 | } |
867 | ||
36955d36 | 868 | ret = exfat_find_location(sb, p_dir, entry, &sec, &off); |
ca061973 | 869 | if (ret) |
20914ff6 | 870 | return ret; |
ca061973 | 871 | |
20914ff6 | 872 | memset(es, 0, sizeof(*es)); |
943af1fd TK |
873 | es->sb = sb; |
874 | es->modified = false; | |
943af1fd | 875 | es->start_off = off; |
a3ff29a9 | 876 | es->bh = es->__bh; |
ca061973 | 877 | |
ca061973 NJ |
878 | bh = sb_bread(sb, sec); |
879 | if (!bh) | |
20914ff6 | 880 | return -EIO; |
943af1fd | 881 | es->bh[es->num_bh++] = bh; |
ca061973 | 882 | |
f3fe3954 | 883 | ep = exfat_get_dentry_cached(es, ES_IDX_FILE); |
943af1fd | 884 | if (!exfat_validate_entry(exfat_get_entry_type(ep), &mode)) |
3b9681ac | 885 | goto put_es; |
ca061973 NJ |
886 | |
887 | num_entries = type == ES_ALL_ENTRIES ? | |
888 | ep->dentry.file.num_ext + 1 : type; | |
ca061973 | 889 | es->num_entries = num_entries; |
ca061973 | 890 | |
943af1fd | 891 | num_bh = EXFAT_B_TO_BLK_ROUND_UP(off + num_entries * DENTRY_SIZE, sb); |
a3ff29a9 YM |
892 | if (num_bh > ARRAY_SIZE(es->__bh)) { |
893 | es->bh = kmalloc_array(num_bh, sizeof(*es->bh), GFP_KERNEL); | |
894 | if (!es->bh) { | |
895 | brelse(bh); | |
20914ff6 | 896 | return -ENOMEM; |
a3ff29a9 YM |
897 | } |
898 | es->bh[0] = bh; | |
899 | } | |
900 | ||
943af1fd TK |
901 | for (i = 1; i < num_bh; i++) { |
902 | /* get the next sector */ | |
903 | if (exfat_is_last_sector_in_cluster(sbi, sec)) { | |
36955d36 YM |
904 | unsigned int clu = exfat_sector_to_cluster(sbi, sec); |
905 | ||
943af1fd TK |
906 | if (p_dir->flags == ALLOC_NO_FAT_CHAIN) |
907 | clu++; | |
908 | else if (exfat_get_next_cluster(sb, &clu)) | |
3b9681ac | 909 | goto put_es; |
943af1fd | 910 | sec = exfat_cluster_to_sector(sbi, clu); |
ca061973 | 911 | } else { |
943af1fd | 912 | sec++; |
ca061973 | 913 | } |
943af1fd TK |
914 | |
915 | bh = sb_bread(sb, sec); | |
916 | if (!bh) | |
3b9681ac | 917 | goto put_es; |
943af1fd | 918 | es->bh[es->num_bh++] = bh; |
ca061973 NJ |
919 | } |
920 | ||
6fa96cd5 | 921 | /* validate cached dentries */ |
f3fe3954 | 922 | for (i = ES_IDX_STREAM; i < num_entries; i++) { |
943af1fd TK |
923 | ep = exfat_get_dentry_cached(es, i); |
924 | if (!exfat_validate_entry(exfat_get_entry_type(ep), &mode)) | |
3b9681ac | 925 | goto put_es; |
943af1fd | 926 | } |
20914ff6 | 927 | return 0; |
ca061973 | 928 | |
3b9681ac YM |
929 | put_es: |
930 | exfat_put_dentry_set(es, false); | |
20914ff6 | 931 | return -EIO; |
ca061973 NJ |
932 | } |
933 | ||
ff39899b YM |
934 | static inline void exfat_reset_empty_hint(struct exfat_hint_femp *hint_femp) |
935 | { | |
936 | hint_femp->eidx = EXFAT_HINT_NONE; | |
937 | hint_femp->count = 0; | |
938 | } | |
939 | ||
940 | static inline void exfat_set_empty_hint(struct exfat_inode_info *ei, | |
941 | struct exfat_hint_femp *candi_empty, struct exfat_chain *clu, | |
e298c8a8 | 942 | int dentry, int num_entries, int entry_type) |
ff39899b YM |
943 | { |
944 | if (ei->hint_femp.eidx == EXFAT_HINT_NONE || | |
945 | ei->hint_femp.eidx > dentry) { | |
e298c8a8 YM |
946 | int total_entries = EXFAT_B_TO_DEN(i_size_read(&ei->vfs_inode)); |
947 | ||
ff39899b YM |
948 | if (candi_empty->count == 0) { |
949 | candi_empty->cur = *clu; | |
950 | candi_empty->eidx = dentry; | |
951 | } | |
952 | ||
e298c8a8 YM |
953 | if (entry_type == TYPE_UNUSED) |
954 | candi_empty->count += total_entries - dentry; | |
955 | else | |
956 | candi_empty->count++; | |
957 | ||
958 | if (candi_empty->count == num_entries || | |
959 | candi_empty->count + candi_empty->eidx == total_entries) | |
ff39899b YM |
960 | ei->hint_femp = *candi_empty; |
961 | } | |
962 | } | |
963 | ||
ca061973 NJ |
964 | enum { |
965 | DIRENT_STEP_FILE, | |
966 | DIRENT_STEP_STRM, | |
967 | DIRENT_STEP_NAME, | |
968 | DIRENT_STEP_SECD, | |
969 | }; | |
970 | ||
971 | /* | |
c6e2f52e HK |
972 | * @ei: inode info of parent directory |
973 | * @p_dir: directory structure of parent directory | |
974 | * @num_entries:entry size of p_uniname | |
975 | * @hint_opt: If p_uniname is found, filled with optimized dir/entry | |
976 | * for traversing cluster chain. | |
977 | * @return: | |
978 | * >= 0: file directory entry position where the name exists | |
979 | * -ENOENT: entry with the name does not exist | |
980 | * -EIO: I/O error | |
ca061973 NJ |
981 | */ |
982 | int exfat_find_dir_entry(struct super_block *sb, struct exfat_inode_info *ei, | |
983 | struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname, | |
72880cb5 | 984 | struct exfat_hint *hint_opt) |
ca061973 NJ |
985 | { |
986 | int i, rewind = 0, dentry = 0, end_eidx = 0, num_ext = 0, len; | |
987 | int order, step, name_len = 0; | |
ff39899b | 988 | int dentries_per_clu; |
ca061973 NJ |
989 | unsigned int entry_type; |
990 | unsigned short *uniname = NULL; | |
991 | struct exfat_chain clu; | |
992 | struct exfat_hint *hint_stat = &ei->hint_stat; | |
993 | struct exfat_hint_femp candi_empty; | |
994 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
72880cb5 YM |
995 | int num_entries = exfat_calc_num_entries(p_uniname); |
996 | ||
997 | if (num_entries < 0) | |
998 | return num_entries; | |
ca061973 NJ |
999 | |
1000 | dentries_per_clu = sbi->dentries_per_clu; | |
1001 | ||
1002 | exfat_chain_dup(&clu, p_dir); | |
1003 | ||
1004 | if (hint_stat->eidx) { | |
1005 | clu.dir = hint_stat->clu; | |
1006 | dentry = hint_stat->eidx; | |
1007 | end_eidx = dentry; | |
1008 | } | |
1009 | ||
ff39899b YM |
1010 | exfat_reset_empty_hint(&ei->hint_femp); |
1011 | ||
ca061973 NJ |
1012 | rewind: |
1013 | order = 0; | |
1014 | step = DIRENT_STEP_FILE; | |
ff39899b YM |
1015 | exfat_reset_empty_hint(&candi_empty); |
1016 | ||
ca061973 NJ |
1017 | while (clu.dir != EXFAT_EOF_CLUSTER) { |
1018 | i = dentry & (dentries_per_clu - 1); | |
1019 | for (; i < dentries_per_clu; i++, dentry++) { | |
1020 | struct exfat_dentry *ep; | |
1021 | struct buffer_head *bh; | |
1022 | ||
1023 | if (rewind && dentry == end_eidx) | |
1024 | goto not_found; | |
1025 | ||
c71510b3 | 1026 | ep = exfat_get_dentry(sb, &clu, i, &bh); |
ca061973 NJ |
1027 | if (!ep) |
1028 | return -EIO; | |
1029 | ||
1030 | entry_type = exfat_get_entry_type(ep); | |
1031 | ||
1032 | if (entry_type == TYPE_UNUSED || | |
1033 | entry_type == TYPE_DELETED) { | |
1034 | step = DIRENT_STEP_FILE; | |
1035 | ||
ff39899b | 1036 | exfat_set_empty_hint(ei, &candi_empty, &clu, |
e298c8a8 YM |
1037 | dentry, num_entries, |
1038 | entry_type); | |
ca061973 NJ |
1039 | |
1040 | brelse(bh); | |
1041 | if (entry_type == TYPE_UNUSED) | |
1042 | goto not_found; | |
1043 | continue; | |
1044 | } | |
1045 | ||
ff39899b | 1046 | exfat_reset_empty_hint(&candi_empty); |
ca061973 NJ |
1047 | |
1048 | if (entry_type == TYPE_FILE || entry_type == TYPE_DIR) { | |
1049 | step = DIRENT_STEP_FILE; | |
c6e2f52e HK |
1050 | hint_opt->clu = clu.dir; |
1051 | hint_opt->eidx = i; | |
72880cb5 YM |
1052 | num_ext = ep->dentry.file.num_ext; |
1053 | step = DIRENT_STEP_STRM; | |
ca061973 NJ |
1054 | brelse(bh); |
1055 | continue; | |
1056 | } | |
1057 | ||
1058 | if (entry_type == TYPE_STREAM) { | |
5875bf28 | 1059 | u16 name_hash; |
ca061973 NJ |
1060 | |
1061 | if (step != DIRENT_STEP_STRM) { | |
1062 | step = DIRENT_STEP_FILE; | |
1063 | brelse(bh); | |
1064 | continue; | |
1065 | } | |
1066 | step = DIRENT_STEP_FILE; | |
1067 | name_hash = le16_to_cpu( | |
1068 | ep->dentry.stream.name_hash); | |
1069 | if (p_uniname->name_hash == name_hash && | |
1070 | p_uniname->name_len == | |
1071 | ep->dentry.stream.name_len) { | |
1072 | step = DIRENT_STEP_NAME; | |
1073 | order = 1; | |
1074 | name_len = 0; | |
1075 | } | |
1076 | brelse(bh); | |
1077 | continue; | |
1078 | } | |
1079 | ||
1080 | brelse(bh); | |
1081 | if (entry_type == TYPE_EXTEND) { | |
1082 | unsigned short entry_uniname[16], unichar; | |
1083 | ||
d4233457 NJ |
1084 | if (step != DIRENT_STEP_NAME || |
1085 | name_len >= MAX_NAME_LENGTH) { | |
ca061973 NJ |
1086 | step = DIRENT_STEP_FILE; |
1087 | continue; | |
1088 | } | |
1089 | ||
1090 | if (++order == 2) | |
1091 | uniname = p_uniname->name; | |
1092 | else | |
1093 | uniname += EXFAT_FILE_NAME_LEN; | |
1094 | ||
1095 | len = exfat_extract_uni_name(ep, entry_uniname); | |
1096 | name_len += len; | |
1097 | ||
1098 | unichar = *(uniname+len); | |
1099 | *(uniname+len) = 0x0; | |
1100 | ||
1101 | if (exfat_uniname_ncmp(sb, uniname, | |
1102 | entry_uniname, len)) { | |
1103 | step = DIRENT_STEP_FILE; | |
1104 | } else if (p_uniname->name_len == name_len) { | |
1105 | if (order == num_ext) | |
1106 | goto found; | |
1107 | step = DIRENT_STEP_SECD; | |
1108 | } | |
1109 | ||
1110 | *(uniname+len) = unichar; | |
1111 | continue; | |
1112 | } | |
1113 | ||
1114 | if (entry_type & | |
1115 | (TYPE_CRITICAL_SEC | TYPE_BENIGN_SEC)) { | |
1116 | if (step == DIRENT_STEP_SECD) { | |
1117 | if (++order == num_ext) | |
1118 | goto found; | |
1119 | continue; | |
1120 | } | |
1121 | } | |
1122 | step = DIRENT_STEP_FILE; | |
1123 | } | |
1124 | ||
1125 | if (clu.flags == ALLOC_NO_FAT_CHAIN) { | |
1126 | if (--clu.size > 0) | |
1127 | clu.dir++; | |
1128 | else | |
1129 | clu.dir = EXFAT_EOF_CLUSTER; | |
1130 | } else { | |
1131 | if (exfat_get_next_cluster(sb, &clu.dir)) | |
1132 | return -EIO; | |
1133 | } | |
1134 | } | |
1135 | ||
1136 | not_found: | |
1137 | /* | |
1138 | * We started at not 0 index,so we should try to find target | |
1139 | * from 0 index to the index we started at. | |
1140 | */ | |
1141 | if (!rewind && end_eidx) { | |
1142 | rewind = 1; | |
1143 | dentry = 0; | |
1144 | clu.dir = p_dir->dir; | |
ca061973 NJ |
1145 | goto rewind; |
1146 | } | |
1147 | ||
e298c8a8 YM |
1148 | /* |
1149 | * set the EXFAT_EOF_CLUSTER flag to avoid search | |
1150 | * from the beginning again when allocated a new cluster | |
1151 | */ | |
1152 | if (ei->hint_femp.eidx == EXFAT_HINT_NONE) { | |
1153 | ei->hint_femp.cur.dir = EXFAT_EOF_CLUSTER; | |
1154 | ei->hint_femp.eidx = p_dir->size * dentries_per_clu; | |
1155 | ei->hint_femp.count = 0; | |
1156 | } | |
1157 | ||
ca061973 NJ |
1158 | /* initialized hint_stat */ |
1159 | hint_stat->clu = p_dir->dir; | |
1160 | hint_stat->eidx = 0; | |
1161 | return -ENOENT; | |
1162 | ||
1163 | found: | |
1164 | /* next dentry we'll find is out of this cluster */ | |
1165 | if (!((dentry + 1) & (dentries_per_clu - 1))) { | |
1166 | int ret = 0; | |
1167 | ||
1168 | if (clu.flags == ALLOC_NO_FAT_CHAIN) { | |
1169 | if (--clu.size > 0) | |
1170 | clu.dir++; | |
1171 | else | |
1172 | clu.dir = EXFAT_EOF_CLUSTER; | |
1173 | } else { | |
1174 | ret = exfat_get_next_cluster(sb, &clu.dir); | |
1175 | } | |
1176 | ||
d2fa0c33 | 1177 | if (ret || clu.dir == EXFAT_EOF_CLUSTER) { |
ca061973 NJ |
1178 | /* just initialized hint_stat */ |
1179 | hint_stat->clu = p_dir->dir; | |
1180 | hint_stat->eidx = 0; | |
1181 | return (dentry - num_ext); | |
1182 | } | |
1183 | } | |
1184 | ||
1185 | hint_stat->clu = clu.dir; | |
1186 | hint_stat->eidx = dentry + 1; | |
1187 | return dentry - num_ext; | |
1188 | } | |
1189 | ||
1190 | int exfat_count_ext_entries(struct super_block *sb, struct exfat_chain *p_dir, | |
1191 | int entry, struct exfat_dentry *ep) | |
1192 | { | |
1193 | int i, count = 0; | |
1194 | unsigned int type; | |
1195 | struct exfat_dentry *ext_ep; | |
1196 | struct buffer_head *bh; | |
1197 | ||
1198 | for (i = 0, entry++; i < ep->dentry.file.num_ext; i++, entry++) { | |
c71510b3 | 1199 | ext_ep = exfat_get_dentry(sb, p_dir, entry, &bh); |
ca061973 NJ |
1200 | if (!ext_ep) |
1201 | return -EIO; | |
1202 | ||
1203 | type = exfat_get_entry_type(ext_ep); | |
1204 | brelse(bh); | |
8258ef28 | 1205 | if (type & TYPE_CRITICAL_SEC || type & TYPE_BENIGN_SEC) |
ca061973 | 1206 | count++; |
ca061973 NJ |
1207 | } |
1208 | return count; | |
1209 | } | |
1210 | ||
1211 | int exfat_count_dir_entries(struct super_block *sb, struct exfat_chain *p_dir) | |
1212 | { | |
1213 | int i, count = 0; | |
1214 | int dentries_per_clu; | |
1215 | unsigned int entry_type; | |
1216 | struct exfat_chain clu; | |
1217 | struct exfat_dentry *ep; | |
1218 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
1219 | struct buffer_head *bh; | |
1220 | ||
1221 | dentries_per_clu = sbi->dentries_per_clu; | |
1222 | ||
1223 | exfat_chain_dup(&clu, p_dir); | |
1224 | ||
1225 | while (clu.dir != EXFAT_EOF_CLUSTER) { | |
1226 | for (i = 0; i < dentries_per_clu; i++) { | |
c71510b3 | 1227 | ep = exfat_get_dentry(sb, &clu, i, &bh); |
ca061973 NJ |
1228 | if (!ep) |
1229 | return -EIO; | |
1230 | entry_type = exfat_get_entry_type(ep); | |
1231 | brelse(bh); | |
1232 | ||
1233 | if (entry_type == TYPE_UNUSED) | |
1234 | return count; | |
1235 | if (entry_type != TYPE_DIR) | |
1236 | continue; | |
1237 | count++; | |
1238 | } | |
1239 | ||
1240 | if (clu.flags == ALLOC_NO_FAT_CHAIN) { | |
1241 | if (--clu.size > 0) | |
1242 | clu.dir++; | |
1243 | else | |
1244 | clu.dir = EXFAT_EOF_CLUSTER; | |
1245 | } else { | |
1246 | if (exfat_get_next_cluster(sb, &(clu.dir))) | |
1247 | return -EIO; | |
1248 | } | |
1249 | } | |
1250 | ||
1251 | return count; | |
1252 | } |