Commit | Line | Data |
---|---|---|
0a8165d7 | 1 | /* |
6b4ea016 JK |
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" | |
398b1ac5 | 14 | #include "node.h" |
6b4ea016 JK |
15 | #include "acl.h" |
16 | ||
17 | static unsigned long dir_blocks(struct inode *inode) | |
18 | { | |
19 | return ((unsigned long long) (i_size_read(inode) + PAGE_CACHE_SIZE - 1)) | |
20 | >> PAGE_CACHE_SHIFT; | |
21 | } | |
22 | ||
23 | static unsigned int dir_buckets(unsigned int level) | |
24 | { | |
25 | if (level < MAX_DIR_HASH_DEPTH / 2) | |
26 | return 1 << level; | |
27 | else | |
28 | return 1 << ((MAX_DIR_HASH_DEPTH / 2) - 1); | |
29 | } | |
30 | ||
31 | static unsigned int bucket_blocks(unsigned int level) | |
32 | { | |
33 | if (level < MAX_DIR_HASH_DEPTH / 2) | |
34 | return 2; | |
35 | else | |
36 | return 4; | |
37 | } | |
38 | ||
39 | static unsigned char f2fs_filetype_table[F2FS_FT_MAX] = { | |
40 | [F2FS_FT_UNKNOWN] = DT_UNKNOWN, | |
41 | [F2FS_FT_REG_FILE] = DT_REG, | |
42 | [F2FS_FT_DIR] = DT_DIR, | |
43 | [F2FS_FT_CHRDEV] = DT_CHR, | |
44 | [F2FS_FT_BLKDEV] = DT_BLK, | |
45 | [F2FS_FT_FIFO] = DT_FIFO, | |
46 | [F2FS_FT_SOCK] = DT_SOCK, | |
47 | [F2FS_FT_SYMLINK] = DT_LNK, | |
48 | }; | |
49 | ||
50 | #define S_SHIFT 12 | |
51 | static unsigned char f2fs_type_by_mode[S_IFMT >> S_SHIFT] = { | |
52 | [S_IFREG >> S_SHIFT] = F2FS_FT_REG_FILE, | |
53 | [S_IFDIR >> S_SHIFT] = F2FS_FT_DIR, | |
54 | [S_IFCHR >> S_SHIFT] = F2FS_FT_CHRDEV, | |
55 | [S_IFBLK >> S_SHIFT] = F2FS_FT_BLKDEV, | |
56 | [S_IFIFO >> S_SHIFT] = F2FS_FT_FIFO, | |
57 | [S_IFSOCK >> S_SHIFT] = F2FS_FT_SOCK, | |
58 | [S_IFLNK >> S_SHIFT] = F2FS_FT_SYMLINK, | |
59 | }; | |
60 | ||
61 | static void set_de_type(struct f2fs_dir_entry *de, struct inode *inode) | |
62 | { | |
63 | mode_t mode = inode->i_mode; | |
64 | de->file_type = f2fs_type_by_mode[(mode & S_IFMT) >> S_SHIFT]; | |
65 | } | |
66 | ||
67 | static unsigned long dir_block_index(unsigned int level, unsigned int idx) | |
68 | { | |
69 | unsigned long i; | |
70 | unsigned long bidx = 0; | |
71 | ||
72 | for (i = 0; i < level; i++) | |
73 | bidx += dir_buckets(i) * bucket_blocks(i); | |
74 | bidx += idx * bucket_blocks(level); | |
75 | return bidx; | |
76 | } | |
77 | ||
9836b8b9 | 78 | static bool early_match_name(const char *name, size_t namelen, |
6b4ea016 JK |
79 | f2fs_hash_t namehash, struct f2fs_dir_entry *de) |
80 | { | |
81 | if (le16_to_cpu(de->name_len) != namelen) | |
82 | return false; | |
83 | ||
25ca923b | 84 | if (de->hash_code != namehash) |
6b4ea016 JK |
85 | return false; |
86 | ||
87 | return true; | |
88 | } | |
89 | ||
90 | static struct f2fs_dir_entry *find_in_block(struct page *dentry_page, | |
9836b8b9 | 91 | const char *name, size_t namelen, int *max_slots, |
6b4ea016 JK |
92 | f2fs_hash_t namehash, struct page **res_page) |
93 | { | |
94 | struct f2fs_dir_entry *de; | |
95 | unsigned long bit_pos, end_pos, next_pos; | |
96 | struct f2fs_dentry_block *dentry_blk = kmap(dentry_page); | |
97 | int slots; | |
98 | ||
99 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
100 | NR_DENTRY_IN_BLOCK, 0); | |
101 | while (bit_pos < NR_DENTRY_IN_BLOCK) { | |
102 | de = &dentry_blk->dentry[bit_pos]; | |
457d08ee | 103 | slots = GET_DENTRY_SLOTS(le16_to_cpu(de->name_len)); |
6b4ea016 JK |
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, | |
9836b8b9 | 130 | unsigned int level, const char *name, size_t namelen, |
6b4ea016 JK |
131 | f2fs_hash_t namehash, struct page **res_page) |
132 | { | |
457d08ee | 133 | int s = GET_DENTRY_SLOTS(namelen); |
6b4ea016 JK |
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 | ||
25ca923b | 146 | bidx = dir_block_index(level, le32_to_cpu(namehash) % nbucket); |
6b4ea016 JK |
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; | |
9836b8b9 | 185 | size_t namelen = child->len; |
6b4ea016 JK |
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); | |
6666e6aa JK |
260 | |
261 | /* update parent inode number before releasing dentry page */ | |
262 | F2FS_I(inode)->i_pino = dir->i_ino; | |
263 | ||
6b4ea016 JK |
264 | f2fs_put_page(page, 1); |
265 | mutex_unlock_op(sbi, DENTRY_OPS); | |
266 | } | |
267 | ||
53dc9a67 | 268 | void init_dent_inode(const struct qstr *name, struct page *ipage) |
6b4ea016 | 269 | { |
6b4ea016 JK |
270 | struct f2fs_node *rn; |
271 | ||
272 | if (IS_ERR(ipage)) | |
273 | return; | |
274 | ||
275 | wait_on_page_writeback(ipage); | |
276 | ||
53dc9a67 | 277 | /* copy name info. to this inode page */ |
6b4ea016 | 278 | rn = (struct f2fs_node *)page_address(ipage); |
53dc9a67 AV |
279 | rn->i.i_namelen = cpu_to_le32(name->len); |
280 | memcpy(rn->i.i_name, name->name, name->len); | |
6b4ea016 JK |
281 | set_page_dirty(ipage); |
282 | } | |
283 | ||
69f24eac AV |
284 | static int init_inode_metadata(struct inode *inode, |
285 | struct inode *dir, const struct qstr *name) | |
6b4ea016 | 286 | { |
6b4ea016 JK |
287 | if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) { |
288 | int err; | |
69f24eac | 289 | err = new_inode_page(inode, name); |
6b4ea016 JK |
290 | if (err) |
291 | return err; | |
292 | ||
293 | if (S_ISDIR(inode->i_mode)) { | |
294 | err = f2fs_make_empty(inode, dir); | |
295 | if (err) { | |
296 | remove_inode_page(inode); | |
297 | return err; | |
298 | } | |
299 | } | |
300 | ||
301 | err = f2fs_init_acl(inode, dir); | |
302 | if (err) { | |
303 | remove_inode_page(inode); | |
304 | return err; | |
305 | } | |
306 | } else { | |
307 | struct page *ipage; | |
308 | ipage = get_node_page(F2FS_SB(dir->i_sb), inode->i_ino); | |
309 | if (IS_ERR(ipage)) | |
310 | return PTR_ERR(ipage); | |
398b1ac5 | 311 | set_cold_node(inode, ipage); |
69f24eac | 312 | init_dent_inode(name, ipage); |
6b4ea016 JK |
313 | f2fs_put_page(ipage, 1); |
314 | } | |
315 | if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) { | |
316 | inc_nlink(inode); | |
317 | f2fs_write_inode(inode, NULL); | |
318 | } | |
319 | return 0; | |
320 | } | |
321 | ||
322 | static void update_parent_metadata(struct inode *dir, struct inode *inode, | |
323 | unsigned int current_depth) | |
324 | { | |
325 | bool need_dir_update = false; | |
326 | ||
327 | if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) { | |
328 | if (S_ISDIR(inode->i_mode)) { | |
329 | inc_nlink(dir); | |
330 | need_dir_update = true; | |
331 | } | |
332 | clear_inode_flag(F2FS_I(inode), FI_NEW_INODE); | |
333 | } | |
334 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; | |
335 | if (F2FS_I(dir)->i_current_depth != current_depth) { | |
336 | F2FS_I(dir)->i_current_depth = current_depth; | |
337 | need_dir_update = true; | |
338 | } | |
339 | ||
340 | if (need_dir_update) | |
341 | f2fs_write_inode(dir, NULL); | |
342 | else | |
343 | mark_inode_dirty(dir); | |
344 | ||
345 | if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) | |
346 | clear_inode_flag(F2FS_I(inode), FI_INC_LINK); | |
347 | } | |
348 | ||
349 | static int room_for_filename(struct f2fs_dentry_block *dentry_blk, int slots) | |
350 | { | |
351 | int bit_start = 0; | |
352 | int zero_start, zero_end; | |
353 | next: | |
354 | zero_start = find_next_zero_bit_le(&dentry_blk->dentry_bitmap, | |
355 | NR_DENTRY_IN_BLOCK, | |
356 | bit_start); | |
357 | if (zero_start >= NR_DENTRY_IN_BLOCK) | |
358 | return NR_DENTRY_IN_BLOCK; | |
359 | ||
360 | zero_end = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
361 | NR_DENTRY_IN_BLOCK, | |
362 | zero_start); | |
363 | if (zero_end - zero_start >= slots) | |
364 | return zero_start; | |
365 | ||
366 | bit_start = zero_end + 1; | |
367 | ||
368 | if (zero_end + 1 >= NR_DENTRY_IN_BLOCK) | |
369 | return NR_DENTRY_IN_BLOCK; | |
370 | goto next; | |
371 | } | |
372 | ||
b7f7a5e0 | 373 | int __f2fs_add_link(struct inode *dir, const struct qstr *name, struct inode *inode) |
6b4ea016 JK |
374 | { |
375 | unsigned int bit_pos; | |
376 | unsigned int level; | |
377 | unsigned int current_depth; | |
378 | unsigned long bidx, block; | |
379 | f2fs_hash_t dentry_hash; | |
380 | struct f2fs_dir_entry *de; | |
381 | unsigned int nbucket, nblock; | |
6b4ea016 | 382 | struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb); |
b7f7a5e0 | 383 | size_t namelen = name->len; |
6b4ea016 JK |
384 | struct page *dentry_page = NULL; |
385 | struct f2fs_dentry_block *dentry_blk = NULL; | |
457d08ee | 386 | int slots = GET_DENTRY_SLOTS(namelen); |
6b4ea016 JK |
387 | int err = 0; |
388 | int i; | |
389 | ||
b7f7a5e0 | 390 | dentry_hash = f2fs_dentry_hash(name->name, name->len); |
6b4ea016 JK |
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 | ||
25ca923b | 409 | bidx = dir_block_index(level, (le32_to_cpu(dentry_hash) % nbucket)); |
6b4ea016 JK |
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: | |
b7f7a5e0 | 433 | err = init_inode_metadata(inode, dir, name); |
6b4ea016 JK |
434 | if (err) |
435 | goto fail; | |
436 | ||
437 | wait_on_page_writeback(dentry_page); | |
438 | ||
439 | de = &dentry_blk->dentry[bit_pos]; | |
25ca923b | 440 | de->hash_code = dentry_hash; |
6b4ea016 | 441 | de->name_len = cpu_to_le16(namelen); |
b7f7a5e0 | 442 | memcpy(dentry_blk->filename[bit_pos], name->name, name->len); |
6b4ea016 JK |
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); | |
6666e6aa | 448 | |
6b4ea016 | 449 | update_parent_metadata(dir, inode, current_depth); |
6666e6aa JK |
450 | |
451 | /* update parent inode number before releasing dentry page */ | |
452 | F2FS_I(inode)->i_pino = dir->i_ino; | |
6b4ea016 JK |
453 | fail: |
454 | kunmap(dentry_page); | |
455 | f2fs_put_page(dentry_page, 1); | |
456 | mutex_unlock_op(sbi, DENTRY_OPS); | |
457 | return err; | |
458 | } | |
459 | ||
0a8165d7 | 460 | /* |
6b4ea016 JK |
461 | * It only removes the dentry from the dentry page,corresponding name |
462 | * entry in name page does not need to be touched during deletion. | |
463 | */ | |
464 | void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page, | |
465 | struct inode *inode) | |
466 | { | |
467 | struct f2fs_dentry_block *dentry_blk; | |
468 | unsigned int bit_pos; | |
469 | struct address_space *mapping = page->mapping; | |
470 | struct inode *dir = mapping->host; | |
471 | struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb); | |
457d08ee | 472 | int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len)); |
6b4ea016 JK |
473 | void *kaddr = page_address(page); |
474 | int i; | |
475 | ||
476 | mutex_lock_op(sbi, DENTRY_OPS); | |
477 | ||
478 | lock_page(page); | |
479 | wait_on_page_writeback(page); | |
480 | ||
481 | dentry_blk = (struct f2fs_dentry_block *)kaddr; | |
482 | bit_pos = dentry - (struct f2fs_dir_entry *)dentry_blk->dentry; | |
483 | for (i = 0; i < slots; i++) | |
484 | test_and_clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap); | |
485 | ||
486 | /* Let's check and deallocate this dentry page */ | |
487 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
488 | NR_DENTRY_IN_BLOCK, | |
489 | 0); | |
490 | kunmap(page); /* kunmap - pair of f2fs_find_entry */ | |
491 | set_page_dirty(page); | |
492 | ||
493 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; | |
494 | ||
495 | if (inode && S_ISDIR(inode->i_mode)) { | |
496 | drop_nlink(dir); | |
497 | f2fs_write_inode(dir, NULL); | |
498 | } else { | |
499 | mark_inode_dirty(dir); | |
500 | } | |
501 | ||
502 | if (inode) { | |
16379987 | 503 | inode->i_ctime = CURRENT_TIME; |
6b4ea016 JK |
504 | drop_nlink(inode); |
505 | if (S_ISDIR(inode->i_mode)) { | |
506 | drop_nlink(inode); | |
507 | i_size_write(inode, 0); | |
508 | } | |
509 | f2fs_write_inode(inode, NULL); | |
510 | if (inode->i_nlink == 0) | |
511 | add_orphan_inode(sbi, inode->i_ino); | |
512 | } | |
513 | ||
514 | if (bit_pos == NR_DENTRY_IN_BLOCK) { | |
6b4ea016 JK |
515 | truncate_hole(dir, page->index, page->index + 1); |
516 | clear_page_dirty_for_io(page); | |
517 | ClearPageUptodate(page); | |
518 | dec_page_count(sbi, F2FS_DIRTY_DENTS); | |
519 | inode_dec_dirty_dents(dir); | |
6b4ea016 | 520 | } |
508198be NJ |
521 | f2fs_put_page(page, 1); |
522 | ||
6b4ea016 JK |
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); | |
38e0abdc | 542 | de->hash_code = f2fs_dentry_hash(".", 1); |
6b4ea016 JK |
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]; | |
38e0abdc | 548 | de->hash_code = f2fs_dentry_hash("..", 2); |
6b4ea016 JK |
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; | |
496ad9aa | 603 | struct inode *inode = file_inode(file); |
6b4ea016 JK |
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 | } | |
457d08ee | 647 | slots = GET_DENTRY_SLOTS(le16_to_cpu(de->name_len)); |
6b4ea016 JK |
648 | bit_pos += slots; |
649 | } | |
650 | bit_pos = 0; | |
651 | file->f_pos = (n + 1) * NR_DENTRY_IN_BLOCK; | |
652 | kunmap(dentry_page); | |
653 | f2fs_put_page(dentry_page, 1); | |
654 | dentry_page = NULL; | |
655 | } | |
656 | success: | |
657 | if (dentry_page && !IS_ERR(dentry_page)) { | |
658 | kunmap(dentry_page); | |
659 | f2fs_put_page(dentry_page, 1); | |
660 | } | |
661 | ||
662 | return 0; | |
663 | } | |
664 | ||
665 | const struct file_operations f2fs_dir_operations = { | |
666 | .llseek = generic_file_llseek, | |
667 | .read = generic_read_dir, | |
668 | .readdir = f2fs_readdir, | |
669 | .fsync = f2fs_sync_file, | |
670 | .unlocked_ioctl = f2fs_ioctl, | |
671 | }; |