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 | 15 | #include "acl.h" |
8ae8f162 | 16 | #include "xattr.h" |
6b4ea016 JK |
17 | |
18 | static unsigned long dir_blocks(struct inode *inode) | |
19 | { | |
20 | return ((unsigned long long) (i_size_read(inode) + PAGE_CACHE_SIZE - 1)) | |
21 | >> PAGE_CACHE_SHIFT; | |
22 | } | |
23 | ||
24 | static unsigned int dir_buckets(unsigned int level) | |
25 | { | |
26 | if (level < MAX_DIR_HASH_DEPTH / 2) | |
27 | return 1 << level; | |
28 | else | |
29 | return 1 << ((MAX_DIR_HASH_DEPTH / 2) - 1); | |
30 | } | |
31 | ||
32 | static unsigned int bucket_blocks(unsigned int level) | |
33 | { | |
34 | if (level < MAX_DIR_HASH_DEPTH / 2) | |
35 | return 2; | |
36 | else | |
37 | return 4; | |
38 | } | |
39 | ||
40 | static unsigned char f2fs_filetype_table[F2FS_FT_MAX] = { | |
41 | [F2FS_FT_UNKNOWN] = DT_UNKNOWN, | |
42 | [F2FS_FT_REG_FILE] = DT_REG, | |
43 | [F2FS_FT_DIR] = DT_DIR, | |
44 | [F2FS_FT_CHRDEV] = DT_CHR, | |
45 | [F2FS_FT_BLKDEV] = DT_BLK, | |
46 | [F2FS_FT_FIFO] = DT_FIFO, | |
47 | [F2FS_FT_SOCK] = DT_SOCK, | |
48 | [F2FS_FT_SYMLINK] = DT_LNK, | |
49 | }; | |
50 | ||
51 | #define S_SHIFT 12 | |
52 | static unsigned char f2fs_type_by_mode[S_IFMT >> S_SHIFT] = { | |
53 | [S_IFREG >> S_SHIFT] = F2FS_FT_REG_FILE, | |
54 | [S_IFDIR >> S_SHIFT] = F2FS_FT_DIR, | |
55 | [S_IFCHR >> S_SHIFT] = F2FS_FT_CHRDEV, | |
56 | [S_IFBLK >> S_SHIFT] = F2FS_FT_BLKDEV, | |
57 | [S_IFIFO >> S_SHIFT] = F2FS_FT_FIFO, | |
58 | [S_IFSOCK >> S_SHIFT] = F2FS_FT_SOCK, | |
59 | [S_IFLNK >> S_SHIFT] = F2FS_FT_SYMLINK, | |
60 | }; | |
61 | ||
62 | static void set_de_type(struct f2fs_dir_entry *de, struct inode *inode) | |
63 | { | |
0ecc833b | 64 | umode_t mode = inode->i_mode; |
6b4ea016 JK |
65 | de->file_type = f2fs_type_by_mode[(mode & S_IFMT) >> S_SHIFT]; |
66 | } | |
67 | ||
68 | static unsigned long dir_block_index(unsigned int level, unsigned int idx) | |
69 | { | |
70 | unsigned long i; | |
71 | unsigned long bidx = 0; | |
72 | ||
73 | for (i = 0; i < level; i++) | |
74 | bidx += dir_buckets(i) * bucket_blocks(i); | |
75 | bidx += idx * bucket_blocks(level); | |
76 | return bidx; | |
77 | } | |
78 | ||
9836b8b9 | 79 | static bool early_match_name(const char *name, size_t namelen, |
6b4ea016 JK |
80 | f2fs_hash_t namehash, struct f2fs_dir_entry *de) |
81 | { | |
82 | if (le16_to_cpu(de->name_len) != namelen) | |
83 | return false; | |
84 | ||
25ca923b | 85 | if (de->hash_code != namehash) |
6b4ea016 JK |
86 | return false; |
87 | ||
88 | return true; | |
89 | } | |
90 | ||
91 | static struct f2fs_dir_entry *find_in_block(struct page *dentry_page, | |
9836b8b9 | 92 | const char *name, size_t namelen, int *max_slots, |
6b4ea016 JK |
93 | f2fs_hash_t namehash, struct page **res_page) |
94 | { | |
95 | struct f2fs_dir_entry *de; | |
5d0c6671 | 96 | unsigned long bit_pos = 0; |
6b4ea016 | 97 | struct f2fs_dentry_block *dentry_blk = kmap(dentry_page); |
5d0c6671 | 98 | int max_len = 0; |
6b4ea016 | 99 | |
6b4ea016 JK |
100 | while (bit_pos < NR_DENTRY_IN_BLOCK) { |
101 | de = &dentry_blk->dentry[bit_pos]; | |
5d0c6671 JK |
102 | if (!test_bit_le(bit_pos, &dentry_blk->dentry_bitmap)) { |
103 | if (bit_pos == 0) | |
104 | max_len = 1; | |
105 | else if (!test_bit_le(bit_pos - 1, &dentry_blk->dentry_bitmap)) | |
106 | max_len++; | |
107 | bit_pos++; | |
108 | continue; | |
109 | } | |
6b4ea016 JK |
110 | if (early_match_name(name, namelen, namehash, de)) { |
111 | if (!memcmp(dentry_blk->filename[bit_pos], | |
112 | name, namelen)) { | |
113 | *res_page = dentry_page; | |
114 | goto found; | |
115 | } | |
116 | } | |
5d0c6671 JK |
117 | if (max_len > *max_slots) { |
118 | *max_slots = max_len; | |
119 | max_len = 0; | |
120 | } | |
121 | bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len)); | |
6b4ea016 JK |
122 | } |
123 | ||
124 | de = NULL; | |
125 | kunmap(dentry_page); | |
126 | found: | |
5d0c6671 JK |
127 | if (max_len > *max_slots) |
128 | *max_slots = max_len; | |
6b4ea016 JK |
129 | return de; |
130 | } | |
131 | ||
132 | static struct f2fs_dir_entry *find_in_level(struct inode *dir, | |
9836b8b9 | 133 | unsigned int level, const char *name, size_t namelen, |
6b4ea016 JK |
134 | f2fs_hash_t namehash, struct page **res_page) |
135 | { | |
457d08ee | 136 | int s = GET_DENTRY_SLOTS(namelen); |
6b4ea016 JK |
137 | unsigned int nbucket, nblock; |
138 | unsigned int bidx, end_block; | |
139 | struct page *dentry_page; | |
140 | struct f2fs_dir_entry *de = NULL; | |
141 | bool room = false; | |
142 | int max_slots = 0; | |
143 | ||
5d56b671 | 144 | f2fs_bug_on(level > MAX_DIR_HASH_DEPTH); |
6b4ea016 JK |
145 | |
146 | nbucket = dir_buckets(level); | |
147 | nblock = bucket_blocks(level); | |
148 | ||
25ca923b | 149 | bidx = dir_block_index(level, le32_to_cpu(namehash) % nbucket); |
6b4ea016 JK |
150 | end_block = bidx + nblock; |
151 | ||
152 | for (; bidx < end_block; bidx++) { | |
153 | /* no need to allocate new dentry pages to all the indices */ | |
c718379b | 154 | dentry_page = find_data_page(dir, bidx, true); |
6b4ea016 JK |
155 | if (IS_ERR(dentry_page)) { |
156 | room = true; | |
157 | continue; | |
158 | } | |
159 | ||
160 | de = find_in_block(dentry_page, name, namelen, | |
161 | &max_slots, namehash, res_page); | |
162 | if (de) | |
163 | break; | |
164 | ||
165 | if (max_slots >= s) | |
166 | room = true; | |
167 | f2fs_put_page(dentry_page, 0); | |
168 | } | |
169 | ||
170 | if (!de && room && F2FS_I(dir)->chash != namehash) { | |
171 | F2FS_I(dir)->chash = namehash; | |
172 | F2FS_I(dir)->clevel = level; | |
173 | } | |
174 | ||
175 | return de; | |
176 | } | |
177 | ||
178 | /* | |
179 | * Find an entry in the specified directory with the wanted name. | |
180 | * It returns the page where the entry was found (as a parameter - res_page), | |
181 | * and the entry itself. Page is returned mapped and unlocked. | |
182 | * Entry is guaranteed to be valid. | |
183 | */ | |
184 | struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir, | |
185 | struct qstr *child, struct page **res_page) | |
186 | { | |
187 | const char *name = child->name; | |
9836b8b9 | 188 | size_t namelen = child->len; |
6b4ea016 JK |
189 | unsigned long npages = dir_blocks(dir); |
190 | struct f2fs_dir_entry *de = NULL; | |
191 | f2fs_hash_t name_hash; | |
192 | unsigned int max_depth; | |
193 | unsigned int level; | |
194 | ||
195 | if (npages == 0) | |
196 | return NULL; | |
197 | ||
198 | *res_page = NULL; | |
199 | ||
200 | name_hash = f2fs_dentry_hash(name, namelen); | |
201 | max_depth = F2FS_I(dir)->i_current_depth; | |
202 | ||
203 | for (level = 0; level < max_depth; level++) { | |
204 | de = find_in_level(dir, level, name, | |
205 | namelen, name_hash, res_page); | |
206 | if (de) | |
207 | break; | |
208 | } | |
209 | if (!de && F2FS_I(dir)->chash != name_hash) { | |
210 | F2FS_I(dir)->chash = name_hash; | |
211 | F2FS_I(dir)->clevel = level - 1; | |
212 | } | |
213 | return de; | |
214 | } | |
215 | ||
216 | struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p) | |
217 | { | |
4777f86b NJ |
218 | struct page *page; |
219 | struct f2fs_dir_entry *de; | |
220 | struct f2fs_dentry_block *dentry_blk; | |
6b4ea016 JK |
221 | |
222 | page = get_lock_data_page(dir, 0); | |
223 | if (IS_ERR(page)) | |
224 | return NULL; | |
225 | ||
226 | dentry_blk = kmap(page); | |
227 | de = &dentry_blk->dentry[1]; | |
228 | *p = page; | |
229 | unlock_page(page); | |
230 | return de; | |
231 | } | |
232 | ||
233 | ino_t f2fs_inode_by_name(struct inode *dir, struct qstr *qstr) | |
234 | { | |
235 | ino_t res = 0; | |
236 | struct f2fs_dir_entry *de; | |
237 | struct page *page; | |
238 | ||
239 | de = f2fs_find_entry(dir, qstr, &page); | |
240 | if (de) { | |
241 | res = le32_to_cpu(de->ino); | |
242 | kunmap(page); | |
243 | f2fs_put_page(page, 0); | |
244 | } | |
245 | ||
246 | return res; | |
247 | } | |
248 | ||
249 | void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de, | |
250 | struct page *page, struct inode *inode) | |
251 | { | |
6b4ea016 JK |
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 | 260 | |
6b4ea016 | 261 | f2fs_put_page(page, 1); |
6b4ea016 JK |
262 | } |
263 | ||
44a83ff6 | 264 | static void init_dent_inode(const struct qstr *name, struct page *ipage) |
6b4ea016 | 265 | { |
58bfaf44 | 266 | struct f2fs_inode *ri; |
6b4ea016 | 267 | |
53dc9a67 | 268 | /* copy name info. to this inode page */ |
58bfaf44 JK |
269 | ri = F2FS_INODE(ipage); |
270 | ri->i_namelen = cpu_to_le32(name->len); | |
271 | memcpy(ri->i_name, name->name, name->len); | |
6b4ea016 JK |
272 | set_page_dirty(ipage); |
273 | } | |
274 | ||
1cd14caf JK |
275 | int update_dent_inode(struct inode *inode, const struct qstr *name) |
276 | { | |
277 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
278 | struct page *page; | |
279 | ||
280 | page = get_node_page(sbi, inode->i_ino); | |
281 | if (IS_ERR(page)) | |
282 | return PTR_ERR(page); | |
283 | ||
284 | init_dent_inode(name, page); | |
285 | f2fs_put_page(page, 1); | |
286 | ||
287 | return 0; | |
288 | } | |
289 | ||
44a83ff6 JK |
290 | static int make_empty_dir(struct inode *inode, |
291 | struct inode *parent, struct page *page) | |
39936837 JK |
292 | { |
293 | struct page *dentry_page; | |
294 | struct f2fs_dentry_block *dentry_blk; | |
295 | struct f2fs_dir_entry *de; | |
296 | void *kaddr; | |
297 | ||
44a83ff6 | 298 | dentry_page = get_new_data_page(inode, page, 0, true); |
39936837 JK |
299 | if (IS_ERR(dentry_page)) |
300 | return PTR_ERR(dentry_page); | |
301 | ||
302 | kaddr = kmap_atomic(dentry_page); | |
303 | dentry_blk = (struct f2fs_dentry_block *)kaddr; | |
304 | ||
305 | de = &dentry_blk->dentry[0]; | |
306 | de->name_len = cpu_to_le16(1); | |
307 | de->hash_code = 0; | |
308 | de->ino = cpu_to_le32(inode->i_ino); | |
309 | memcpy(dentry_blk->filename[0], ".", 1); | |
310 | set_de_type(de, inode); | |
311 | ||
312 | de = &dentry_blk->dentry[1]; | |
313 | de->hash_code = 0; | |
314 | de->name_len = cpu_to_le16(2); | |
315 | de->ino = cpu_to_le32(parent->i_ino); | |
316 | memcpy(dentry_blk->filename[1], "..", 2); | |
317 | set_de_type(de, inode); | |
318 | ||
319 | test_and_set_bit_le(0, &dentry_blk->dentry_bitmap); | |
320 | test_and_set_bit_le(1, &dentry_blk->dentry_bitmap); | |
321 | kunmap_atomic(kaddr); | |
322 | ||
323 | set_page_dirty(dentry_page); | |
324 | f2fs_put_page(dentry_page, 1); | |
325 | return 0; | |
326 | } | |
327 | ||
44a83ff6 | 328 | static struct page *init_inode_metadata(struct inode *inode, |
69f24eac | 329 | struct inode *dir, const struct qstr *name) |
6b4ea016 | 330 | { |
44a83ff6 JK |
331 | struct page *page; |
332 | int err; | |
333 | ||
6b4ea016 | 334 | if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) { |
44a83ff6 JK |
335 | page = new_inode_page(inode, name); |
336 | if (IS_ERR(page)) | |
337 | return page; | |
6b4ea016 JK |
338 | |
339 | if (S_ISDIR(inode->i_mode)) { | |
44a83ff6 JK |
340 | err = make_empty_dir(inode, dir, page); |
341 | if (err) | |
342 | goto error; | |
6b4ea016 JK |
343 | } |
344 | ||
2ed2d5b3 | 345 | err = f2fs_init_acl(inode, dir, page); |
44a83ff6 | 346 | if (err) |
a8865372 | 347 | goto put_error; |
44a83ff6 | 348 | |
8ae8f162 JK |
349 | err = f2fs_init_security(inode, dir, name, page); |
350 | if (err) | |
a8865372 | 351 | goto put_error; |
8ae8f162 | 352 | |
44a83ff6 | 353 | wait_on_page_writeback(page); |
6b4ea016 | 354 | } else { |
44a83ff6 JK |
355 | page = get_node_page(F2FS_SB(dir->i_sb), inode->i_ino); |
356 | if (IS_ERR(page)) | |
357 | return page; | |
358 | ||
359 | wait_on_page_writeback(page); | |
360 | set_cold_node(inode, page); | |
6b4ea016 | 361 | } |
44a83ff6 JK |
362 | |
363 | init_dent_inode(name, page); | |
364 | ||
83d5d6f6 JK |
365 | /* |
366 | * This file should be checkpointed during fsync. | |
367 | * We lost i_pino from now on. | |
368 | */ | |
6b4ea016 | 369 | if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) { |
354a3399 | 370 | file_lost_pino(inode); |
6b4ea016 | 371 | inc_nlink(inode); |
6b4ea016 | 372 | } |
44a83ff6 JK |
373 | return page; |
374 | ||
a8865372 | 375 | put_error: |
44a83ff6 | 376 | f2fs_put_page(page, 1); |
bd859c65 JK |
377 | /* once the failed inode becomes a bad inode, i_mode is S_IFREG */ |
378 | truncate_inode_pages(&inode->i_data, 0); | |
379 | truncate_blocks(inode, 0); | |
380 | remove_dirty_dir_inode(inode); | |
a8865372 | 381 | error: |
44a83ff6 JK |
382 | remove_inode_page(inode); |
383 | return ERR_PTR(err); | |
6b4ea016 JK |
384 | } |
385 | ||
386 | static void update_parent_metadata(struct inode *dir, struct inode *inode, | |
387 | unsigned int current_depth) | |
388 | { | |
6b4ea016 JK |
389 | if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) { |
390 | if (S_ISDIR(inode->i_mode)) { | |
391 | inc_nlink(dir); | |
699489bb | 392 | set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR); |
6b4ea016 JK |
393 | } |
394 | clear_inode_flag(F2FS_I(inode), FI_NEW_INODE); | |
395 | } | |
396 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; | |
a18ff063 JK |
397 | mark_inode_dirty(dir); |
398 | ||
6b4ea016 JK |
399 | if (F2FS_I(dir)->i_current_depth != current_depth) { |
400 | F2FS_I(dir)->i_current_depth = current_depth; | |
699489bb | 401 | set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR); |
6b4ea016 JK |
402 | } |
403 | ||
6b4ea016 JK |
404 | if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) |
405 | clear_inode_flag(F2FS_I(inode), FI_INC_LINK); | |
406 | } | |
407 | ||
408 | static int room_for_filename(struct f2fs_dentry_block *dentry_blk, int slots) | |
409 | { | |
410 | int bit_start = 0; | |
411 | int zero_start, zero_end; | |
412 | next: | |
413 | zero_start = find_next_zero_bit_le(&dentry_blk->dentry_bitmap, | |
414 | NR_DENTRY_IN_BLOCK, | |
415 | bit_start); | |
416 | if (zero_start >= NR_DENTRY_IN_BLOCK) | |
417 | return NR_DENTRY_IN_BLOCK; | |
418 | ||
419 | zero_end = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
420 | NR_DENTRY_IN_BLOCK, | |
421 | zero_start); | |
422 | if (zero_end - zero_start >= slots) | |
423 | return zero_start; | |
424 | ||
425 | bit_start = zero_end + 1; | |
426 | ||
427 | if (zero_end + 1 >= NR_DENTRY_IN_BLOCK) | |
428 | return NR_DENTRY_IN_BLOCK; | |
429 | goto next; | |
430 | } | |
431 | ||
39936837 | 432 | /* |
4f4124d0 CY |
433 | * Caller should grab and release a rwsem by calling f2fs_lock_op() and |
434 | * f2fs_unlock_op(). | |
39936837 | 435 | */ |
6c311ec6 CF |
436 | int __f2fs_add_link(struct inode *dir, const struct qstr *name, |
437 | struct inode *inode) | |
6b4ea016 JK |
438 | { |
439 | unsigned int bit_pos; | |
440 | unsigned int level; | |
441 | unsigned int current_depth; | |
442 | unsigned long bidx, block; | |
443 | f2fs_hash_t dentry_hash; | |
444 | struct f2fs_dir_entry *de; | |
445 | unsigned int nbucket, nblock; | |
b7f7a5e0 | 446 | size_t namelen = name->len; |
6b4ea016 JK |
447 | struct page *dentry_page = NULL; |
448 | struct f2fs_dentry_block *dentry_blk = NULL; | |
457d08ee | 449 | int slots = GET_DENTRY_SLOTS(namelen); |
44a83ff6 | 450 | struct page *page; |
6b4ea016 JK |
451 | int err = 0; |
452 | int i; | |
453 | ||
b7f7a5e0 | 454 | dentry_hash = f2fs_dentry_hash(name->name, name->len); |
6b4ea016 JK |
455 | level = 0; |
456 | current_depth = F2FS_I(dir)->i_current_depth; | |
457 | if (F2FS_I(dir)->chash == dentry_hash) { | |
458 | level = F2FS_I(dir)->clevel; | |
459 | F2FS_I(dir)->chash = 0; | |
460 | } | |
461 | ||
462 | start: | |
cfb271d4 | 463 | if (unlikely(current_depth == MAX_DIR_HASH_DEPTH)) |
6b4ea016 JK |
464 | return -ENOSPC; |
465 | ||
466 | /* Increase the depth, if required */ | |
467 | if (level == current_depth) | |
468 | ++current_depth; | |
469 | ||
470 | nbucket = dir_buckets(level); | |
471 | nblock = bucket_blocks(level); | |
472 | ||
25ca923b | 473 | bidx = dir_block_index(level, (le32_to_cpu(dentry_hash) % nbucket)); |
6b4ea016 JK |
474 | |
475 | for (block = bidx; block <= (bidx + nblock - 1); block++) { | |
64aa7ed9 | 476 | dentry_page = get_new_data_page(dir, NULL, block, true); |
39936837 | 477 | if (IS_ERR(dentry_page)) |
6b4ea016 | 478 | return PTR_ERR(dentry_page); |
6b4ea016 JK |
479 | |
480 | dentry_blk = kmap(dentry_page); | |
481 | bit_pos = room_for_filename(dentry_blk, slots); | |
482 | if (bit_pos < NR_DENTRY_IN_BLOCK) | |
483 | goto add_dentry; | |
484 | ||
485 | kunmap(dentry_page); | |
486 | f2fs_put_page(dentry_page, 1); | |
6b4ea016 JK |
487 | } |
488 | ||
489 | /* Move to next level to find the empty slot for new dentry */ | |
490 | ++level; | |
491 | goto start; | |
492 | add_dentry: | |
6b4ea016 JK |
493 | wait_on_page_writeback(dentry_page); |
494 | ||
44a83ff6 JK |
495 | page = init_inode_metadata(inode, dir, name); |
496 | if (IS_ERR(page)) { | |
497 | err = PTR_ERR(page); | |
498 | goto fail; | |
499 | } | |
6b4ea016 | 500 | de = &dentry_blk->dentry[bit_pos]; |
25ca923b | 501 | de->hash_code = dentry_hash; |
6b4ea016 | 502 | de->name_len = cpu_to_le16(namelen); |
b7f7a5e0 | 503 | memcpy(dentry_blk->filename[bit_pos], name->name, name->len); |
6b4ea016 JK |
504 | de->ino = cpu_to_le32(inode->i_ino); |
505 | set_de_type(de, inode); | |
506 | for (i = 0; i < slots; i++) | |
507 | test_and_set_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap); | |
508 | set_page_dirty(dentry_page); | |
6666e6aa | 509 | |
44a83ff6 | 510 | /* we don't need to mark_inode_dirty now */ |
6666e6aa | 511 | F2FS_I(inode)->i_pino = dir->i_ino; |
44a83ff6 JK |
512 | update_inode(inode, page); |
513 | f2fs_put_page(page, 1); | |
514 | ||
515 | update_parent_metadata(dir, inode, current_depth); | |
6b4ea016 | 516 | fail: |
924a2ddb JK |
517 | if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR)) { |
518 | update_inode_page(dir); | |
519 | clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR); | |
520 | } | |
6b4ea016 JK |
521 | kunmap(dentry_page); |
522 | f2fs_put_page(dentry_page, 1); | |
6b4ea016 JK |
523 | return err; |
524 | } | |
525 | ||
0a8165d7 | 526 | /* |
6b4ea016 JK |
527 | * It only removes the dentry from the dentry page,corresponding name |
528 | * entry in name page does not need to be touched during deletion. | |
529 | */ | |
530 | void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page, | |
531 | struct inode *inode) | |
532 | { | |
533 | struct f2fs_dentry_block *dentry_blk; | |
534 | unsigned int bit_pos; | |
535 | struct address_space *mapping = page->mapping; | |
536 | struct inode *dir = mapping->host; | |
457d08ee | 537 | int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len)); |
6b4ea016 JK |
538 | void *kaddr = page_address(page); |
539 | int i; | |
540 | ||
6b4ea016 JK |
541 | lock_page(page); |
542 | wait_on_page_writeback(page); | |
543 | ||
544 | dentry_blk = (struct f2fs_dentry_block *)kaddr; | |
545 | bit_pos = dentry - (struct f2fs_dir_entry *)dentry_blk->dentry; | |
546 | for (i = 0; i < slots; i++) | |
547 | test_and_clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap); | |
548 | ||
549 | /* Let's check and deallocate this dentry page */ | |
550 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
551 | NR_DENTRY_IN_BLOCK, | |
552 | 0); | |
553 | kunmap(page); /* kunmap - pair of f2fs_find_entry */ | |
554 | set_page_dirty(page); | |
555 | ||
556 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; | |
557 | ||
6b4ea016 | 558 | if (inode) { |
1fe54f9d JK |
559 | struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb); |
560 | ||
e8dae604 JK |
561 | if (S_ISDIR(inode->i_mode)) { |
562 | drop_nlink(dir); | |
563 | update_inode_page(dir); | |
564 | } | |
16379987 | 565 | inode->i_ctime = CURRENT_TIME; |
6b4ea016 JK |
566 | drop_nlink(inode); |
567 | if (S_ISDIR(inode->i_mode)) { | |
568 | drop_nlink(inode); | |
569 | i_size_write(inode, 0); | |
570 | } | |
39936837 JK |
571 | update_inode_page(inode); |
572 | ||
6b4ea016 JK |
573 | if (inode->i_nlink == 0) |
574 | add_orphan_inode(sbi, inode->i_ino); | |
cbd56e7d JK |
575 | else |
576 | release_orphan_inode(sbi); | |
6b4ea016 JK |
577 | } |
578 | ||
579 | if (bit_pos == NR_DENTRY_IN_BLOCK) { | |
6b4ea016 JK |
580 | truncate_hole(dir, page->index, page->index + 1); |
581 | clear_page_dirty_for_io(page); | |
582 | ClearPageUptodate(page); | |
6b4ea016 | 583 | inode_dec_dirty_dents(dir); |
6b4ea016 | 584 | } |
508198be | 585 | f2fs_put_page(page, 1); |
6b4ea016 JK |
586 | } |
587 | ||
588 | bool f2fs_empty_dir(struct inode *dir) | |
589 | { | |
590 | unsigned long bidx; | |
591 | struct page *dentry_page; | |
592 | unsigned int bit_pos; | |
593 | struct f2fs_dentry_block *dentry_blk; | |
594 | unsigned long nblock = dir_blocks(dir); | |
595 | ||
596 | for (bidx = 0; bidx < nblock; bidx++) { | |
597 | void *kaddr; | |
598 | dentry_page = get_lock_data_page(dir, bidx); | |
599 | if (IS_ERR(dentry_page)) { | |
600 | if (PTR_ERR(dentry_page) == -ENOENT) | |
601 | continue; | |
602 | else | |
603 | return false; | |
604 | } | |
605 | ||
606 | kaddr = kmap_atomic(dentry_page); | |
607 | dentry_blk = (struct f2fs_dentry_block *)kaddr; | |
608 | if (bidx == 0) | |
609 | bit_pos = 2; | |
610 | else | |
611 | bit_pos = 0; | |
612 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
613 | NR_DENTRY_IN_BLOCK, | |
614 | bit_pos); | |
615 | kunmap_atomic(kaddr); | |
616 | ||
617 | f2fs_put_page(dentry_page, 1); | |
618 | ||
619 | if (bit_pos < NR_DENTRY_IN_BLOCK) | |
620 | return false; | |
621 | } | |
622 | return true; | |
623 | } | |
624 | ||
6f7f231e | 625 | static int f2fs_readdir(struct file *file, struct dir_context *ctx) |
6b4ea016 | 626 | { |
496ad9aa | 627 | struct inode *inode = file_inode(file); |
6b4ea016 | 628 | unsigned long npages = dir_blocks(inode); |
99b072bb | 629 | unsigned int bit_pos = 0; |
6b4ea016 JK |
630 | struct f2fs_dentry_block *dentry_blk = NULL; |
631 | struct f2fs_dir_entry *de = NULL; | |
632 | struct page *dentry_page = NULL; | |
6f7f231e | 633 | unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK); |
6b4ea016 | 634 | unsigned char d_type = DT_UNKNOWN; |
6b4ea016 | 635 | |
6f7f231e | 636 | bit_pos = ((unsigned long)ctx->pos % NR_DENTRY_IN_BLOCK); |
6b4ea016 | 637 | |
6c311ec6 | 638 | for (; n < npages; n++) { |
6b4ea016 JK |
639 | dentry_page = get_lock_data_page(inode, n); |
640 | if (IS_ERR(dentry_page)) | |
641 | continue; | |
642 | ||
6b4ea016 JK |
643 | dentry_blk = kmap(dentry_page); |
644 | while (bit_pos < NR_DENTRY_IN_BLOCK) { | |
6b4ea016 JK |
645 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, |
646 | NR_DENTRY_IN_BLOCK, | |
647 | bit_pos); | |
648 | if (bit_pos >= NR_DENTRY_IN_BLOCK) | |
649 | break; | |
650 | ||
651 | de = &dentry_blk->dentry[bit_pos]; | |
6f7f231e AV |
652 | if (de->file_type < F2FS_FT_MAX) |
653 | d_type = f2fs_filetype_table[de->file_type]; | |
654 | else | |
655 | d_type = DT_UNKNOWN; | |
656 | if (!dir_emit(ctx, | |
99b072bb JK |
657 | dentry_blk->filename[bit_pos], |
658 | le16_to_cpu(de->name_len), | |
659 | le32_to_cpu(de->ino), d_type)) | |
660 | goto stop; | |
661 | ||
662 | bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len)); | |
663 | ctx->pos = n * NR_DENTRY_IN_BLOCK + bit_pos; | |
6b4ea016 JK |
664 | } |
665 | bit_pos = 0; | |
6f7f231e | 666 | ctx->pos = (n + 1) * NR_DENTRY_IN_BLOCK; |
6b4ea016 JK |
667 | kunmap(dentry_page); |
668 | f2fs_put_page(dentry_page, 1); | |
669 | dentry_page = NULL; | |
670 | } | |
99b072bb | 671 | stop: |
6b4ea016 JK |
672 | if (dentry_page && !IS_ERR(dentry_page)) { |
673 | kunmap(dentry_page); | |
674 | f2fs_put_page(dentry_page, 1); | |
675 | } | |
676 | ||
677 | return 0; | |
678 | } | |
679 | ||
680 | const struct file_operations f2fs_dir_operations = { | |
681 | .llseek = generic_file_llseek, | |
682 | .read = generic_read_dir, | |
6f7f231e | 683 | .iterate = f2fs_readdir, |
6b4ea016 JK |
684 | .fsync = f2fs_sync_file, |
685 | .unlocked_ioctl = f2fs_ioctl, | |
686 | }; |