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6b4ea016 JK |
1 | /** |
2 | * fs/f2fs/dir.c | |
3 | * | |
4 | * Copyright (c) 2012 Samsung Electronics Co., Ltd. | |
5 | * http://www.samsung.com/ | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | #include <linux/fs.h> | |
12 | #include <linux/f2fs_fs.h> | |
13 | #include "f2fs.h" | |
14 | #include "acl.h" | |
15 | ||
16 | static unsigned long dir_blocks(struct inode *inode) | |
17 | { | |
18 | return ((unsigned long long) (i_size_read(inode) + PAGE_CACHE_SIZE - 1)) | |
19 | >> PAGE_CACHE_SHIFT; | |
20 | } | |
21 | ||
22 | static unsigned int dir_buckets(unsigned int level) | |
23 | { | |
24 | if (level < MAX_DIR_HASH_DEPTH / 2) | |
25 | return 1 << level; | |
26 | else | |
27 | return 1 << ((MAX_DIR_HASH_DEPTH / 2) - 1); | |
28 | } | |
29 | ||
30 | static unsigned int bucket_blocks(unsigned int level) | |
31 | { | |
32 | if (level < MAX_DIR_HASH_DEPTH / 2) | |
33 | return 2; | |
34 | else | |
35 | return 4; | |
36 | } | |
37 | ||
38 | static unsigned char f2fs_filetype_table[F2FS_FT_MAX] = { | |
39 | [F2FS_FT_UNKNOWN] = DT_UNKNOWN, | |
40 | [F2FS_FT_REG_FILE] = DT_REG, | |
41 | [F2FS_FT_DIR] = DT_DIR, | |
42 | [F2FS_FT_CHRDEV] = DT_CHR, | |
43 | [F2FS_FT_BLKDEV] = DT_BLK, | |
44 | [F2FS_FT_FIFO] = DT_FIFO, | |
45 | [F2FS_FT_SOCK] = DT_SOCK, | |
46 | [F2FS_FT_SYMLINK] = DT_LNK, | |
47 | }; | |
48 | ||
49 | #define S_SHIFT 12 | |
50 | static unsigned char f2fs_type_by_mode[S_IFMT >> S_SHIFT] = { | |
51 | [S_IFREG >> S_SHIFT] = F2FS_FT_REG_FILE, | |
52 | [S_IFDIR >> S_SHIFT] = F2FS_FT_DIR, | |
53 | [S_IFCHR >> S_SHIFT] = F2FS_FT_CHRDEV, | |
54 | [S_IFBLK >> S_SHIFT] = F2FS_FT_BLKDEV, | |
55 | [S_IFIFO >> S_SHIFT] = F2FS_FT_FIFO, | |
56 | [S_IFSOCK >> S_SHIFT] = F2FS_FT_SOCK, | |
57 | [S_IFLNK >> S_SHIFT] = F2FS_FT_SYMLINK, | |
58 | }; | |
59 | ||
60 | static void set_de_type(struct f2fs_dir_entry *de, struct inode *inode) | |
61 | { | |
62 | mode_t mode = inode->i_mode; | |
63 | de->file_type = f2fs_type_by_mode[(mode & S_IFMT) >> S_SHIFT]; | |
64 | } | |
65 | ||
66 | static unsigned long dir_block_index(unsigned int level, unsigned int idx) | |
67 | { | |
68 | unsigned long i; | |
69 | unsigned long bidx = 0; | |
70 | ||
71 | for (i = 0; i < level; i++) | |
72 | bidx += dir_buckets(i) * bucket_blocks(i); | |
73 | bidx += idx * bucket_blocks(level); | |
74 | return bidx; | |
75 | } | |
76 | ||
77 | static bool early_match_name(const char *name, int namelen, | |
78 | f2fs_hash_t namehash, struct f2fs_dir_entry *de) | |
79 | { | |
80 | if (le16_to_cpu(de->name_len) != namelen) | |
81 | return false; | |
82 | ||
83 | if (le32_to_cpu(de->hash_code) != namehash) | |
84 | return false; | |
85 | ||
86 | return true; | |
87 | } | |
88 | ||
89 | static struct f2fs_dir_entry *find_in_block(struct page *dentry_page, | |
90 | const char *name, int namelen, int *max_slots, | |
91 | f2fs_hash_t namehash, struct page **res_page) | |
92 | { | |
93 | struct f2fs_dir_entry *de; | |
94 | unsigned long bit_pos, end_pos, next_pos; | |
95 | struct f2fs_dentry_block *dentry_blk = kmap(dentry_page); | |
96 | int slots; | |
97 | ||
98 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
99 | NR_DENTRY_IN_BLOCK, 0); | |
100 | while (bit_pos < NR_DENTRY_IN_BLOCK) { | |
101 | de = &dentry_blk->dentry[bit_pos]; | |
102 | slots = (le16_to_cpu(de->name_len) + F2FS_NAME_LEN - 1) / | |
103 | F2FS_NAME_LEN; | |
104 | ||
105 | if (early_match_name(name, namelen, namehash, de)) { | |
106 | if (!memcmp(dentry_blk->filename[bit_pos], | |
107 | name, namelen)) { | |
108 | *res_page = dentry_page; | |
109 | goto found; | |
110 | } | |
111 | } | |
112 | next_pos = bit_pos + slots; | |
113 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
114 | NR_DENTRY_IN_BLOCK, next_pos); | |
115 | if (bit_pos >= NR_DENTRY_IN_BLOCK) | |
116 | end_pos = NR_DENTRY_IN_BLOCK; | |
117 | else | |
118 | end_pos = bit_pos; | |
119 | if (*max_slots < end_pos - next_pos) | |
120 | *max_slots = end_pos - next_pos; | |
121 | } | |
122 | ||
123 | de = NULL; | |
124 | kunmap(dentry_page); | |
125 | found: | |
126 | return de; | |
127 | } | |
128 | ||
129 | static struct f2fs_dir_entry *find_in_level(struct inode *dir, | |
130 | unsigned int level, const char *name, int namelen, | |
131 | f2fs_hash_t namehash, struct page **res_page) | |
132 | { | |
133 | int s = (namelen + F2FS_NAME_LEN - 1) / F2FS_NAME_LEN; | |
134 | unsigned int nbucket, nblock; | |
135 | unsigned int bidx, end_block; | |
136 | struct page *dentry_page; | |
137 | struct f2fs_dir_entry *de = NULL; | |
138 | bool room = false; | |
139 | int max_slots = 0; | |
140 | ||
141 | BUG_ON(level > MAX_DIR_HASH_DEPTH); | |
142 | ||
143 | nbucket = dir_buckets(level); | |
144 | nblock = bucket_blocks(level); | |
145 | ||
146 | bidx = dir_block_index(level, namehash % nbucket); | |
147 | end_block = bidx + nblock; | |
148 | ||
149 | for (; bidx < end_block; bidx++) { | |
150 | /* no need to allocate new dentry pages to all the indices */ | |
151 | dentry_page = find_data_page(dir, bidx); | |
152 | if (IS_ERR(dentry_page)) { | |
153 | room = true; | |
154 | continue; | |
155 | } | |
156 | ||
157 | de = find_in_block(dentry_page, name, namelen, | |
158 | &max_slots, namehash, res_page); | |
159 | if (de) | |
160 | break; | |
161 | ||
162 | if (max_slots >= s) | |
163 | room = true; | |
164 | f2fs_put_page(dentry_page, 0); | |
165 | } | |
166 | ||
167 | if (!de && room && F2FS_I(dir)->chash != namehash) { | |
168 | F2FS_I(dir)->chash = namehash; | |
169 | F2FS_I(dir)->clevel = level; | |
170 | } | |
171 | ||
172 | return de; | |
173 | } | |
174 | ||
175 | /* | |
176 | * Find an entry in the specified directory with the wanted name. | |
177 | * It returns the page where the entry was found (as a parameter - res_page), | |
178 | * and the entry itself. Page is returned mapped and unlocked. | |
179 | * Entry is guaranteed to be valid. | |
180 | */ | |
181 | struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir, | |
182 | struct qstr *child, struct page **res_page) | |
183 | { | |
184 | const char *name = child->name; | |
185 | int namelen = child->len; | |
186 | unsigned long npages = dir_blocks(dir); | |
187 | struct f2fs_dir_entry *de = NULL; | |
188 | f2fs_hash_t name_hash; | |
189 | unsigned int max_depth; | |
190 | unsigned int level; | |
191 | ||
192 | if (npages == 0) | |
193 | return NULL; | |
194 | ||
195 | *res_page = NULL; | |
196 | ||
197 | name_hash = f2fs_dentry_hash(name, namelen); | |
198 | max_depth = F2FS_I(dir)->i_current_depth; | |
199 | ||
200 | for (level = 0; level < max_depth; level++) { | |
201 | de = find_in_level(dir, level, name, | |
202 | namelen, name_hash, res_page); | |
203 | if (de) | |
204 | break; | |
205 | } | |
206 | if (!de && F2FS_I(dir)->chash != name_hash) { | |
207 | F2FS_I(dir)->chash = name_hash; | |
208 | F2FS_I(dir)->clevel = level - 1; | |
209 | } | |
210 | return de; | |
211 | } | |
212 | ||
213 | struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p) | |
214 | { | |
215 | struct page *page = NULL; | |
216 | struct f2fs_dir_entry *de = NULL; | |
217 | struct f2fs_dentry_block *dentry_blk = NULL; | |
218 | ||
219 | page = get_lock_data_page(dir, 0); | |
220 | if (IS_ERR(page)) | |
221 | return NULL; | |
222 | ||
223 | dentry_blk = kmap(page); | |
224 | de = &dentry_blk->dentry[1]; | |
225 | *p = page; | |
226 | unlock_page(page); | |
227 | return de; | |
228 | } | |
229 | ||
230 | ino_t f2fs_inode_by_name(struct inode *dir, struct qstr *qstr) | |
231 | { | |
232 | ino_t res = 0; | |
233 | struct f2fs_dir_entry *de; | |
234 | struct page *page; | |
235 | ||
236 | de = f2fs_find_entry(dir, qstr, &page); | |
237 | if (de) { | |
238 | res = le32_to_cpu(de->ino); | |
239 | kunmap(page); | |
240 | f2fs_put_page(page, 0); | |
241 | } | |
242 | ||
243 | return res; | |
244 | } | |
245 | ||
246 | void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de, | |
247 | struct page *page, struct inode *inode) | |
248 | { | |
249 | struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb); | |
250 | ||
251 | mutex_lock_op(sbi, DENTRY_OPS); | |
252 | lock_page(page); | |
253 | wait_on_page_writeback(page); | |
254 | de->ino = cpu_to_le32(inode->i_ino); | |
255 | set_de_type(de, inode); | |
256 | kunmap(page); | |
257 | set_page_dirty(page); | |
258 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; | |
259 | mark_inode_dirty(dir); | |
260 | f2fs_put_page(page, 1); | |
261 | mutex_unlock_op(sbi, DENTRY_OPS); | |
262 | } | |
263 | ||
264 | void init_dent_inode(struct dentry *dentry, struct page *ipage) | |
265 | { | |
266 | struct inode *dir = dentry->d_parent->d_inode; | |
267 | struct f2fs_node *rn; | |
268 | ||
269 | if (IS_ERR(ipage)) | |
270 | return; | |
271 | ||
272 | wait_on_page_writeback(ipage); | |
273 | ||
274 | /* copy dentry info. to this inode page */ | |
275 | rn = (struct f2fs_node *)page_address(ipage); | |
276 | rn->i.i_pino = cpu_to_le32(dir->i_ino); | |
277 | rn->i.i_namelen = cpu_to_le32(dentry->d_name.len); | |
278 | memcpy(rn->i.i_name, dentry->d_name.name, dentry->d_name.len); | |
279 | set_page_dirty(ipage); | |
280 | } | |
281 | ||
282 | static int init_inode_metadata(struct inode *inode, struct dentry *dentry) | |
283 | { | |
284 | struct inode *dir = dentry->d_parent->d_inode; | |
285 | ||
286 | if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) { | |
287 | int err; | |
288 | err = new_inode_page(inode, dentry); | |
289 | if (err) | |
290 | return err; | |
291 | ||
292 | if (S_ISDIR(inode->i_mode)) { | |
293 | err = f2fs_make_empty(inode, dir); | |
294 | if (err) { | |
295 | remove_inode_page(inode); | |
296 | return err; | |
297 | } | |
298 | } | |
299 | ||
300 | err = f2fs_init_acl(inode, dir); | |
301 | if (err) { | |
302 | remove_inode_page(inode); | |
303 | return err; | |
304 | } | |
305 | } else { | |
306 | struct page *ipage; | |
307 | ipage = get_node_page(F2FS_SB(dir->i_sb), inode->i_ino); | |
308 | if (IS_ERR(ipage)) | |
309 | return PTR_ERR(ipage); | |
310 | init_dent_inode(dentry, ipage); | |
311 | f2fs_put_page(ipage, 1); | |
312 | } | |
313 | if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) { | |
314 | inc_nlink(inode); | |
315 | f2fs_write_inode(inode, NULL); | |
316 | } | |
317 | return 0; | |
318 | } | |
319 | ||
320 | static void update_parent_metadata(struct inode *dir, struct inode *inode, | |
321 | unsigned int current_depth) | |
322 | { | |
323 | bool need_dir_update = false; | |
324 | ||
325 | if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) { | |
326 | if (S_ISDIR(inode->i_mode)) { | |
327 | inc_nlink(dir); | |
328 | need_dir_update = true; | |
329 | } | |
330 | clear_inode_flag(F2FS_I(inode), FI_NEW_INODE); | |
331 | } | |
332 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; | |
333 | if (F2FS_I(dir)->i_current_depth != current_depth) { | |
334 | F2FS_I(dir)->i_current_depth = current_depth; | |
335 | need_dir_update = true; | |
336 | } | |
337 | ||
338 | if (need_dir_update) | |
339 | f2fs_write_inode(dir, NULL); | |
340 | else | |
341 | mark_inode_dirty(dir); | |
342 | ||
343 | if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) | |
344 | clear_inode_flag(F2FS_I(inode), FI_INC_LINK); | |
345 | } | |
346 | ||
347 | static int room_for_filename(struct f2fs_dentry_block *dentry_blk, int slots) | |
348 | { | |
349 | int bit_start = 0; | |
350 | int zero_start, zero_end; | |
351 | next: | |
352 | zero_start = find_next_zero_bit_le(&dentry_blk->dentry_bitmap, | |
353 | NR_DENTRY_IN_BLOCK, | |
354 | bit_start); | |
355 | if (zero_start >= NR_DENTRY_IN_BLOCK) | |
356 | return NR_DENTRY_IN_BLOCK; | |
357 | ||
358 | zero_end = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
359 | NR_DENTRY_IN_BLOCK, | |
360 | zero_start); | |
361 | if (zero_end - zero_start >= slots) | |
362 | return zero_start; | |
363 | ||
364 | bit_start = zero_end + 1; | |
365 | ||
366 | if (zero_end + 1 >= NR_DENTRY_IN_BLOCK) | |
367 | return NR_DENTRY_IN_BLOCK; | |
368 | goto next; | |
369 | } | |
370 | ||
371 | int f2fs_add_link(struct dentry *dentry, struct inode *inode) | |
372 | { | |
373 | unsigned int bit_pos; | |
374 | unsigned int level; | |
375 | unsigned int current_depth; | |
376 | unsigned long bidx, block; | |
377 | f2fs_hash_t dentry_hash; | |
378 | struct f2fs_dir_entry *de; | |
379 | unsigned int nbucket, nblock; | |
380 | struct inode *dir = dentry->d_parent->d_inode; | |
381 | struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb); | |
382 | const char *name = dentry->d_name.name; | |
383 | int namelen = dentry->d_name.len; | |
384 | struct page *dentry_page = NULL; | |
385 | struct f2fs_dentry_block *dentry_blk = NULL; | |
386 | int slots = (namelen + F2FS_NAME_LEN - 1) / F2FS_NAME_LEN; | |
387 | int err = 0; | |
388 | int i; | |
389 | ||
390 | dentry_hash = f2fs_dentry_hash(name, dentry->d_name.len); | |
391 | level = 0; | |
392 | current_depth = F2FS_I(dir)->i_current_depth; | |
393 | if (F2FS_I(dir)->chash == dentry_hash) { | |
394 | level = F2FS_I(dir)->clevel; | |
395 | F2FS_I(dir)->chash = 0; | |
396 | } | |
397 | ||
398 | start: | |
399 | if (current_depth == MAX_DIR_HASH_DEPTH) | |
400 | return -ENOSPC; | |
401 | ||
402 | /* Increase the depth, if required */ | |
403 | if (level == current_depth) | |
404 | ++current_depth; | |
405 | ||
406 | nbucket = dir_buckets(level); | |
407 | nblock = bucket_blocks(level); | |
408 | ||
409 | bidx = dir_block_index(level, (dentry_hash % nbucket)); | |
410 | ||
411 | for (block = bidx; block <= (bidx + nblock - 1); block++) { | |
412 | mutex_lock_op(sbi, DENTRY_OPS); | |
413 | dentry_page = get_new_data_page(dir, block, true); | |
414 | if (IS_ERR(dentry_page)) { | |
415 | mutex_unlock_op(sbi, DENTRY_OPS); | |
416 | return PTR_ERR(dentry_page); | |
417 | } | |
418 | ||
419 | dentry_blk = kmap(dentry_page); | |
420 | bit_pos = room_for_filename(dentry_blk, slots); | |
421 | if (bit_pos < NR_DENTRY_IN_BLOCK) | |
422 | goto add_dentry; | |
423 | ||
424 | kunmap(dentry_page); | |
425 | f2fs_put_page(dentry_page, 1); | |
426 | mutex_unlock_op(sbi, DENTRY_OPS); | |
427 | } | |
428 | ||
429 | /* Move to next level to find the empty slot for new dentry */ | |
430 | ++level; | |
431 | goto start; | |
432 | add_dentry: | |
433 | err = init_inode_metadata(inode, dentry); | |
434 | if (err) | |
435 | goto fail; | |
436 | ||
437 | wait_on_page_writeback(dentry_page); | |
438 | ||
439 | de = &dentry_blk->dentry[bit_pos]; | |
440 | de->hash_code = cpu_to_le32(dentry_hash); | |
441 | de->name_len = cpu_to_le16(namelen); | |
442 | memcpy(dentry_blk->filename[bit_pos], name, namelen); | |
443 | de->ino = cpu_to_le32(inode->i_ino); | |
444 | set_de_type(de, inode); | |
445 | for (i = 0; i < slots; i++) | |
446 | test_and_set_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap); | |
447 | set_page_dirty(dentry_page); | |
448 | update_parent_metadata(dir, inode, current_depth); | |
449 | fail: | |
450 | kunmap(dentry_page); | |
451 | f2fs_put_page(dentry_page, 1); | |
452 | mutex_unlock_op(sbi, DENTRY_OPS); | |
453 | return err; | |
454 | } | |
455 | ||
456 | /** | |
457 | * It only removes the dentry from the dentry page,corresponding name | |
458 | * entry in name page does not need to be touched during deletion. | |
459 | */ | |
460 | void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page, | |
461 | struct inode *inode) | |
462 | { | |
463 | struct f2fs_dentry_block *dentry_blk; | |
464 | unsigned int bit_pos; | |
465 | struct address_space *mapping = page->mapping; | |
466 | struct inode *dir = mapping->host; | |
467 | struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb); | |
468 | int slots = (le16_to_cpu(dentry->name_len) + F2FS_NAME_LEN - 1) / | |
469 | F2FS_NAME_LEN; | |
470 | void *kaddr = page_address(page); | |
471 | int i; | |
472 | ||
473 | mutex_lock_op(sbi, DENTRY_OPS); | |
474 | ||
475 | lock_page(page); | |
476 | wait_on_page_writeback(page); | |
477 | ||
478 | dentry_blk = (struct f2fs_dentry_block *)kaddr; | |
479 | bit_pos = dentry - (struct f2fs_dir_entry *)dentry_blk->dentry; | |
480 | for (i = 0; i < slots; i++) | |
481 | test_and_clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap); | |
482 | ||
483 | /* Let's check and deallocate this dentry page */ | |
484 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
485 | NR_DENTRY_IN_BLOCK, | |
486 | 0); | |
487 | kunmap(page); /* kunmap - pair of f2fs_find_entry */ | |
488 | set_page_dirty(page); | |
489 | ||
490 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; | |
491 | ||
492 | if (inode && S_ISDIR(inode->i_mode)) { | |
493 | drop_nlink(dir); | |
494 | f2fs_write_inode(dir, NULL); | |
495 | } else { | |
496 | mark_inode_dirty(dir); | |
497 | } | |
498 | ||
499 | if (inode) { | |
500 | inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME; | |
501 | drop_nlink(inode); | |
502 | if (S_ISDIR(inode->i_mode)) { | |
503 | drop_nlink(inode); | |
504 | i_size_write(inode, 0); | |
505 | } | |
506 | f2fs_write_inode(inode, NULL); | |
507 | if (inode->i_nlink == 0) | |
508 | add_orphan_inode(sbi, inode->i_ino); | |
509 | } | |
510 | ||
511 | if (bit_pos == NR_DENTRY_IN_BLOCK) { | |
512 | loff_t page_offset; | |
513 | truncate_hole(dir, page->index, page->index + 1); | |
514 | clear_page_dirty_for_io(page); | |
515 | ClearPageUptodate(page); | |
516 | dec_page_count(sbi, F2FS_DIRTY_DENTS); | |
517 | inode_dec_dirty_dents(dir); | |
518 | page_offset = page->index << PAGE_CACHE_SHIFT; | |
519 | f2fs_put_page(page, 1); | |
520 | } else { | |
521 | f2fs_put_page(page, 1); | |
522 | } | |
523 | mutex_unlock_op(sbi, DENTRY_OPS); | |
524 | } | |
525 | ||
526 | int f2fs_make_empty(struct inode *inode, struct inode *parent) | |
527 | { | |
528 | struct page *dentry_page; | |
529 | struct f2fs_dentry_block *dentry_blk; | |
530 | struct f2fs_dir_entry *de; | |
531 | void *kaddr; | |
532 | ||
533 | dentry_page = get_new_data_page(inode, 0, true); | |
534 | if (IS_ERR(dentry_page)) | |
535 | return PTR_ERR(dentry_page); | |
536 | ||
537 | kaddr = kmap_atomic(dentry_page); | |
538 | dentry_blk = (struct f2fs_dentry_block *)kaddr; | |
539 | ||
540 | de = &dentry_blk->dentry[0]; | |
541 | de->name_len = cpu_to_le16(1); | |
542 | de->hash_code = 0; | |
543 | de->ino = cpu_to_le32(inode->i_ino); | |
544 | memcpy(dentry_blk->filename[0], ".", 1); | |
545 | set_de_type(de, inode); | |
546 | ||
547 | de = &dentry_blk->dentry[1]; | |
548 | de->hash_code = 0; | |
549 | de->name_len = cpu_to_le16(2); | |
550 | de->ino = cpu_to_le32(parent->i_ino); | |
551 | memcpy(dentry_blk->filename[1], "..", 2); | |
552 | set_de_type(de, inode); | |
553 | ||
554 | test_and_set_bit_le(0, &dentry_blk->dentry_bitmap); | |
555 | test_and_set_bit_le(1, &dentry_blk->dentry_bitmap); | |
556 | kunmap_atomic(kaddr); | |
557 | ||
558 | set_page_dirty(dentry_page); | |
559 | f2fs_put_page(dentry_page, 1); | |
560 | return 0; | |
561 | } | |
562 | ||
563 | bool f2fs_empty_dir(struct inode *dir) | |
564 | { | |
565 | unsigned long bidx; | |
566 | struct page *dentry_page; | |
567 | unsigned int bit_pos; | |
568 | struct f2fs_dentry_block *dentry_blk; | |
569 | unsigned long nblock = dir_blocks(dir); | |
570 | ||
571 | for (bidx = 0; bidx < nblock; bidx++) { | |
572 | void *kaddr; | |
573 | dentry_page = get_lock_data_page(dir, bidx); | |
574 | if (IS_ERR(dentry_page)) { | |
575 | if (PTR_ERR(dentry_page) == -ENOENT) | |
576 | continue; | |
577 | else | |
578 | return false; | |
579 | } | |
580 | ||
581 | kaddr = kmap_atomic(dentry_page); | |
582 | dentry_blk = (struct f2fs_dentry_block *)kaddr; | |
583 | if (bidx == 0) | |
584 | bit_pos = 2; | |
585 | else | |
586 | bit_pos = 0; | |
587 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
588 | NR_DENTRY_IN_BLOCK, | |
589 | bit_pos); | |
590 | kunmap_atomic(kaddr); | |
591 | ||
592 | f2fs_put_page(dentry_page, 1); | |
593 | ||
594 | if (bit_pos < NR_DENTRY_IN_BLOCK) | |
595 | return false; | |
596 | } | |
597 | return true; | |
598 | } | |
599 | ||
600 | static int f2fs_readdir(struct file *file, void *dirent, filldir_t filldir) | |
601 | { | |
602 | unsigned long pos = file->f_pos; | |
603 | struct inode *inode = file->f_dentry->d_inode; | |
604 | unsigned long npages = dir_blocks(inode); | |
605 | unsigned char *types = NULL; | |
606 | unsigned int bit_pos = 0, start_bit_pos = 0; | |
607 | int over = 0; | |
608 | struct f2fs_dentry_block *dentry_blk = NULL; | |
609 | struct f2fs_dir_entry *de = NULL; | |
610 | struct page *dentry_page = NULL; | |
611 | unsigned int n = 0; | |
612 | unsigned char d_type = DT_UNKNOWN; | |
613 | int slots; | |
614 | ||
615 | types = f2fs_filetype_table; | |
616 | bit_pos = (pos % NR_DENTRY_IN_BLOCK); | |
617 | n = (pos / NR_DENTRY_IN_BLOCK); | |
618 | ||
619 | for ( ; n < npages; n++) { | |
620 | dentry_page = get_lock_data_page(inode, n); | |
621 | if (IS_ERR(dentry_page)) | |
622 | continue; | |
623 | ||
624 | start_bit_pos = bit_pos; | |
625 | dentry_blk = kmap(dentry_page); | |
626 | while (bit_pos < NR_DENTRY_IN_BLOCK) { | |
627 | d_type = DT_UNKNOWN; | |
628 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
629 | NR_DENTRY_IN_BLOCK, | |
630 | bit_pos); | |
631 | if (bit_pos >= NR_DENTRY_IN_BLOCK) | |
632 | break; | |
633 | ||
634 | de = &dentry_blk->dentry[bit_pos]; | |
635 | if (types && de->file_type < F2FS_FT_MAX) | |
636 | d_type = types[de->file_type]; | |
637 | ||
638 | over = filldir(dirent, | |
639 | dentry_blk->filename[bit_pos], | |
640 | le16_to_cpu(de->name_len), | |
641 | (n * NR_DENTRY_IN_BLOCK) + bit_pos, | |
642 | le32_to_cpu(de->ino), d_type); | |
643 | if (over) { | |
644 | file->f_pos += bit_pos - start_bit_pos; | |
645 | goto success; | |
646 | } | |
647 | slots = (le16_to_cpu(de->name_len) + F2FS_NAME_LEN - 1) | |
648 | / F2FS_NAME_LEN; | |
649 | bit_pos += slots; | |
650 | } | |
651 | bit_pos = 0; | |
652 | file->f_pos = (n + 1) * NR_DENTRY_IN_BLOCK; | |
653 | kunmap(dentry_page); | |
654 | f2fs_put_page(dentry_page, 1); | |
655 | dentry_page = NULL; | |
656 | } | |
657 | success: | |
658 | if (dentry_page && !IS_ERR(dentry_page)) { | |
659 | kunmap(dentry_page); | |
660 | f2fs_put_page(dentry_page, 1); | |
661 | } | |
662 | ||
663 | return 0; | |
664 | } | |
665 | ||
666 | const struct file_operations f2fs_dir_operations = { | |
667 | .llseek = generic_file_llseek, | |
668 | .read = generic_read_dir, | |
669 | .readdir = f2fs_readdir, | |
670 | .fsync = f2fs_sync_file, | |
671 | .unlocked_ioctl = f2fs_ioctl, | |
672 | }; |