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 | ||
38431545 | 24 | static unsigned int dir_buckets(unsigned int level, int dir_level) |
6b4ea016 | 25 | { |
bfec07d0 | 26 | if (level + dir_level < MAX_DIR_HASH_DEPTH / 2) |
38431545 | 27 | return 1 << (level + dir_level); |
6b4ea016 | 28 | else |
bfec07d0 | 29 | return MAX_DIR_BUCKETS; |
6b4ea016 JK |
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 | ||
38431545 JK |
68 | static unsigned long dir_block_index(unsigned int level, |
69 | int dir_level, unsigned int idx) | |
6b4ea016 JK |
70 | { |
71 | unsigned long i; | |
72 | unsigned long bidx = 0; | |
73 | ||
74 | for (i = 0; i < level; i++) | |
38431545 | 75 | bidx += dir_buckets(i, dir_level) * bucket_blocks(i); |
6b4ea016 JK |
76 | bidx += idx * bucket_blocks(level); |
77 | return bidx; | |
78 | } | |
79 | ||
9836b8b9 | 80 | static bool early_match_name(const char *name, size_t namelen, |
6b4ea016 JK |
81 | f2fs_hash_t namehash, struct f2fs_dir_entry *de) |
82 | { | |
83 | if (le16_to_cpu(de->name_len) != namelen) | |
84 | return false; | |
85 | ||
25ca923b | 86 | if (de->hash_code != namehash) |
6b4ea016 JK |
87 | return false; |
88 | ||
89 | return true; | |
90 | } | |
91 | ||
92 | static struct f2fs_dir_entry *find_in_block(struct page *dentry_page, | |
9836b8b9 | 93 | const char *name, size_t namelen, int *max_slots, |
6b4ea016 JK |
94 | f2fs_hash_t namehash, struct page **res_page) |
95 | { | |
96 | struct f2fs_dir_entry *de; | |
5d0c6671 | 97 | unsigned long bit_pos = 0; |
6b4ea016 | 98 | struct f2fs_dentry_block *dentry_blk = kmap(dentry_page); |
20f70751 | 99 | const void *dentry_bits = &dentry_blk->dentry_bitmap; |
5d0c6671 | 100 | int max_len = 0; |
6b4ea016 | 101 | |
6b4ea016 | 102 | while (bit_pos < NR_DENTRY_IN_BLOCK) { |
20f70751 | 103 | if (!test_bit_le(bit_pos, dentry_bits)) { |
5d0c6671 JK |
104 | if (bit_pos == 0) |
105 | max_len = 1; | |
20f70751 | 106 | else if (!test_bit_le(bit_pos - 1, dentry_bits)) |
5d0c6671 JK |
107 | max_len++; |
108 | bit_pos++; | |
109 | continue; | |
110 | } | |
20f70751 | 111 | de = &dentry_blk->dentry[bit_pos]; |
6b4ea016 JK |
112 | if (early_match_name(name, namelen, namehash, de)) { |
113 | if (!memcmp(dentry_blk->filename[bit_pos], | |
114 | name, namelen)) { | |
115 | *res_page = dentry_page; | |
116 | goto found; | |
117 | } | |
118 | } | |
5d0c6671 JK |
119 | if (max_len > *max_slots) { |
120 | *max_slots = max_len; | |
121 | max_len = 0; | |
122 | } | |
123 | bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len)); | |
6b4ea016 JK |
124 | } |
125 | ||
126 | de = NULL; | |
127 | kunmap(dentry_page); | |
128 | found: | |
5d0c6671 JK |
129 | if (max_len > *max_slots) |
130 | *max_slots = max_len; | |
6b4ea016 JK |
131 | return de; |
132 | } | |
133 | ||
134 | static struct f2fs_dir_entry *find_in_level(struct inode *dir, | |
9836b8b9 | 135 | unsigned int level, const char *name, size_t namelen, |
6b4ea016 JK |
136 | f2fs_hash_t namehash, struct page **res_page) |
137 | { | |
457d08ee | 138 | int s = GET_DENTRY_SLOTS(namelen); |
6b4ea016 JK |
139 | unsigned int nbucket, nblock; |
140 | unsigned int bidx, end_block; | |
141 | struct page *dentry_page; | |
142 | struct f2fs_dir_entry *de = NULL; | |
143 | bool room = false; | |
144 | int max_slots = 0; | |
145 | ||
5d56b671 | 146 | f2fs_bug_on(level > MAX_DIR_HASH_DEPTH); |
6b4ea016 | 147 | |
38431545 | 148 | nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level); |
6b4ea016 JK |
149 | nblock = bucket_blocks(level); |
150 | ||
38431545 JK |
151 | bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level, |
152 | le32_to_cpu(namehash) % nbucket); | |
6b4ea016 JK |
153 | end_block = bidx + nblock; |
154 | ||
155 | for (; bidx < end_block; bidx++) { | |
156 | /* no need to allocate new dentry pages to all the indices */ | |
c718379b | 157 | dentry_page = find_data_page(dir, bidx, true); |
6b4ea016 JK |
158 | if (IS_ERR(dentry_page)) { |
159 | room = true; | |
160 | continue; | |
161 | } | |
162 | ||
163 | de = find_in_block(dentry_page, name, namelen, | |
164 | &max_slots, namehash, res_page); | |
165 | if (de) | |
166 | break; | |
167 | ||
168 | if (max_slots >= s) | |
169 | room = true; | |
170 | f2fs_put_page(dentry_page, 0); | |
171 | } | |
172 | ||
173 | if (!de && room && F2FS_I(dir)->chash != namehash) { | |
174 | F2FS_I(dir)->chash = namehash; | |
175 | F2FS_I(dir)->clevel = level; | |
176 | } | |
177 | ||
178 | return de; | |
179 | } | |
180 | ||
181 | /* | |
182 | * Find an entry in the specified directory with the wanted name. | |
183 | * It returns the page where the entry was found (as a parameter - res_page), | |
184 | * and the entry itself. Page is returned mapped and unlocked. | |
185 | * Entry is guaranteed to be valid. | |
186 | */ | |
187 | struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir, | |
188 | struct qstr *child, struct page **res_page) | |
189 | { | |
190 | const char *name = child->name; | |
9836b8b9 | 191 | size_t namelen = child->len; |
6b4ea016 JK |
192 | unsigned long npages = dir_blocks(dir); |
193 | struct f2fs_dir_entry *de = NULL; | |
194 | f2fs_hash_t name_hash; | |
195 | unsigned int max_depth; | |
196 | unsigned int level; | |
197 | ||
198 | if (npages == 0) | |
199 | return NULL; | |
200 | ||
201 | *res_page = NULL; | |
202 | ||
203 | name_hash = f2fs_dentry_hash(name, namelen); | |
204 | max_depth = F2FS_I(dir)->i_current_depth; | |
205 | ||
206 | for (level = 0; level < max_depth; level++) { | |
207 | de = find_in_level(dir, level, name, | |
208 | namelen, name_hash, res_page); | |
209 | if (de) | |
210 | break; | |
211 | } | |
212 | if (!de && F2FS_I(dir)->chash != name_hash) { | |
213 | F2FS_I(dir)->chash = name_hash; | |
214 | F2FS_I(dir)->clevel = level - 1; | |
215 | } | |
216 | return de; | |
217 | } | |
218 | ||
219 | struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p) | |
220 | { | |
4777f86b NJ |
221 | struct page *page; |
222 | struct f2fs_dir_entry *de; | |
223 | struct f2fs_dentry_block *dentry_blk; | |
6b4ea016 JK |
224 | |
225 | page = get_lock_data_page(dir, 0); | |
226 | if (IS_ERR(page)) | |
227 | return NULL; | |
228 | ||
229 | dentry_blk = kmap(page); | |
230 | de = &dentry_blk->dentry[1]; | |
231 | *p = page; | |
232 | unlock_page(page); | |
233 | return de; | |
234 | } | |
235 | ||
236 | ino_t f2fs_inode_by_name(struct inode *dir, struct qstr *qstr) | |
237 | { | |
238 | ino_t res = 0; | |
239 | struct f2fs_dir_entry *de; | |
240 | struct page *page; | |
241 | ||
242 | de = f2fs_find_entry(dir, qstr, &page); | |
243 | if (de) { | |
244 | res = le32_to_cpu(de->ino); | |
245 | kunmap(page); | |
246 | f2fs_put_page(page, 0); | |
247 | } | |
248 | ||
249 | return res; | |
250 | } | |
251 | ||
252 | void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de, | |
253 | struct page *page, struct inode *inode) | |
254 | { | |
6b4ea016 | 255 | lock_page(page); |
3cb5ad15 | 256 | f2fs_wait_on_page_writeback(page, DATA); |
6b4ea016 JK |
257 | de->ino = cpu_to_le32(inode->i_ino); |
258 | set_de_type(de, inode); | |
259 | kunmap(page); | |
260 | set_page_dirty(page); | |
261 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; | |
262 | mark_inode_dirty(dir); | |
6666e6aa | 263 | |
6b4ea016 | 264 | f2fs_put_page(page, 1); |
6b4ea016 JK |
265 | } |
266 | ||
44a83ff6 | 267 | static void init_dent_inode(const struct qstr *name, struct page *ipage) |
6b4ea016 | 268 | { |
58bfaf44 | 269 | struct f2fs_inode *ri; |
6b4ea016 | 270 | |
54b591df JK |
271 | f2fs_wait_on_page_writeback(ipage, NODE); |
272 | ||
53dc9a67 | 273 | /* copy name info. to this inode page */ |
58bfaf44 JK |
274 | ri = F2FS_INODE(ipage); |
275 | ri->i_namelen = cpu_to_le32(name->len); | |
276 | memcpy(ri->i_name, name->name, name->len); | |
6b4ea016 JK |
277 | set_page_dirty(ipage); |
278 | } | |
279 | ||
1cd14caf JK |
280 | int update_dent_inode(struct inode *inode, const struct qstr *name) |
281 | { | |
282 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
283 | struct page *page; | |
284 | ||
285 | page = get_node_page(sbi, inode->i_ino); | |
286 | if (IS_ERR(page)) | |
287 | return PTR_ERR(page); | |
288 | ||
289 | init_dent_inode(name, page); | |
290 | f2fs_put_page(page, 1); | |
291 | ||
292 | return 0; | |
293 | } | |
294 | ||
44a83ff6 JK |
295 | static int make_empty_dir(struct inode *inode, |
296 | struct inode *parent, struct page *page) | |
39936837 JK |
297 | { |
298 | struct page *dentry_page; | |
299 | struct f2fs_dentry_block *dentry_blk; | |
300 | struct f2fs_dir_entry *de; | |
301 | void *kaddr; | |
302 | ||
44a83ff6 | 303 | dentry_page = get_new_data_page(inode, page, 0, true); |
39936837 JK |
304 | if (IS_ERR(dentry_page)) |
305 | return PTR_ERR(dentry_page); | |
306 | ||
307 | kaddr = kmap_atomic(dentry_page); | |
308 | dentry_blk = (struct f2fs_dentry_block *)kaddr; | |
309 | ||
310 | de = &dentry_blk->dentry[0]; | |
311 | de->name_len = cpu_to_le16(1); | |
312 | de->hash_code = 0; | |
313 | de->ino = cpu_to_le32(inode->i_ino); | |
314 | memcpy(dentry_blk->filename[0], ".", 1); | |
315 | set_de_type(de, inode); | |
316 | ||
317 | de = &dentry_blk->dentry[1]; | |
318 | de->hash_code = 0; | |
319 | de->name_len = cpu_to_le16(2); | |
320 | de->ino = cpu_to_le32(parent->i_ino); | |
321 | memcpy(dentry_blk->filename[1], "..", 2); | |
322 | set_de_type(de, inode); | |
323 | ||
324 | test_and_set_bit_le(0, &dentry_blk->dentry_bitmap); | |
325 | test_and_set_bit_le(1, &dentry_blk->dentry_bitmap); | |
326 | kunmap_atomic(kaddr); | |
327 | ||
328 | set_page_dirty(dentry_page); | |
329 | f2fs_put_page(dentry_page, 1); | |
330 | return 0; | |
331 | } | |
332 | ||
44a83ff6 | 333 | static struct page *init_inode_metadata(struct inode *inode, |
69f24eac | 334 | struct inode *dir, const struct qstr *name) |
6b4ea016 | 335 | { |
44a83ff6 JK |
336 | struct page *page; |
337 | int err; | |
338 | ||
6b4ea016 | 339 | if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) { |
44a83ff6 JK |
340 | page = new_inode_page(inode, name); |
341 | if (IS_ERR(page)) | |
342 | return page; | |
6b4ea016 JK |
343 | |
344 | if (S_ISDIR(inode->i_mode)) { | |
44a83ff6 JK |
345 | err = make_empty_dir(inode, dir, page); |
346 | if (err) | |
347 | goto error; | |
6b4ea016 JK |
348 | } |
349 | ||
2ed2d5b3 | 350 | err = f2fs_init_acl(inode, dir, page); |
44a83ff6 | 351 | if (err) |
a8865372 | 352 | goto put_error; |
44a83ff6 | 353 | |
8ae8f162 JK |
354 | err = f2fs_init_security(inode, dir, name, page); |
355 | if (err) | |
a8865372 | 356 | goto put_error; |
6b4ea016 | 357 | } else { |
44a83ff6 JK |
358 | page = get_node_page(F2FS_SB(dir->i_sb), inode->i_ino); |
359 | if (IS_ERR(page)) | |
360 | return page; | |
361 | ||
44a83ff6 | 362 | set_cold_node(inode, page); |
6b4ea016 | 363 | } |
44a83ff6 JK |
364 | |
365 | init_dent_inode(name, page); | |
366 | ||
83d5d6f6 JK |
367 | /* |
368 | * This file should be checkpointed during fsync. | |
369 | * We lost i_pino from now on. | |
370 | */ | |
6b4ea016 | 371 | if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) { |
354a3399 | 372 | file_lost_pino(inode); |
6b4ea016 | 373 | inc_nlink(inode); |
6b4ea016 | 374 | } |
44a83ff6 JK |
375 | return page; |
376 | ||
a8865372 | 377 | put_error: |
44a83ff6 | 378 | f2fs_put_page(page, 1); |
bd859c65 JK |
379 | /* once the failed inode becomes a bad inode, i_mode is S_IFREG */ |
380 | truncate_inode_pages(&inode->i_data, 0); | |
381 | truncate_blocks(inode, 0); | |
382 | remove_dirty_dir_inode(inode); | |
a8865372 | 383 | error: |
44a83ff6 JK |
384 | remove_inode_page(inode); |
385 | return ERR_PTR(err); | |
6b4ea016 JK |
386 | } |
387 | ||
388 | static void update_parent_metadata(struct inode *dir, struct inode *inode, | |
389 | unsigned int current_depth) | |
390 | { | |
6b4ea016 JK |
391 | if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) { |
392 | if (S_ISDIR(inode->i_mode)) { | |
393 | inc_nlink(dir); | |
699489bb | 394 | set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR); |
6b4ea016 JK |
395 | } |
396 | clear_inode_flag(F2FS_I(inode), FI_NEW_INODE); | |
397 | } | |
398 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; | |
a18ff063 JK |
399 | mark_inode_dirty(dir); |
400 | ||
6b4ea016 JK |
401 | if (F2FS_I(dir)->i_current_depth != current_depth) { |
402 | F2FS_I(dir)->i_current_depth = current_depth; | |
699489bb | 403 | set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR); |
6b4ea016 JK |
404 | } |
405 | ||
6b4ea016 JK |
406 | if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) |
407 | clear_inode_flag(F2FS_I(inode), FI_INC_LINK); | |
408 | } | |
409 | ||
410 | static int room_for_filename(struct f2fs_dentry_block *dentry_blk, int slots) | |
411 | { | |
412 | int bit_start = 0; | |
413 | int zero_start, zero_end; | |
414 | next: | |
415 | zero_start = find_next_zero_bit_le(&dentry_blk->dentry_bitmap, | |
416 | NR_DENTRY_IN_BLOCK, | |
417 | bit_start); | |
418 | if (zero_start >= NR_DENTRY_IN_BLOCK) | |
419 | return NR_DENTRY_IN_BLOCK; | |
420 | ||
421 | zero_end = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
422 | NR_DENTRY_IN_BLOCK, | |
423 | zero_start); | |
424 | if (zero_end - zero_start >= slots) | |
425 | return zero_start; | |
426 | ||
427 | bit_start = zero_end + 1; | |
428 | ||
429 | if (zero_end + 1 >= NR_DENTRY_IN_BLOCK) | |
430 | return NR_DENTRY_IN_BLOCK; | |
431 | goto next; | |
432 | } | |
433 | ||
39936837 | 434 | /* |
4f4124d0 CY |
435 | * Caller should grab and release a rwsem by calling f2fs_lock_op() and |
436 | * f2fs_unlock_op(). | |
39936837 | 437 | */ |
6c311ec6 CF |
438 | int __f2fs_add_link(struct inode *dir, const struct qstr *name, |
439 | struct inode *inode) | |
6b4ea016 JK |
440 | { |
441 | unsigned int bit_pos; | |
442 | unsigned int level; | |
443 | unsigned int current_depth; | |
444 | unsigned long bidx, block; | |
445 | f2fs_hash_t dentry_hash; | |
446 | struct f2fs_dir_entry *de; | |
447 | unsigned int nbucket, nblock; | |
b7f7a5e0 | 448 | size_t namelen = name->len; |
6b4ea016 JK |
449 | struct page *dentry_page = NULL; |
450 | struct f2fs_dentry_block *dentry_blk = NULL; | |
457d08ee | 451 | int slots = GET_DENTRY_SLOTS(namelen); |
44a83ff6 | 452 | struct page *page; |
6b4ea016 JK |
453 | int err = 0; |
454 | int i; | |
455 | ||
b7f7a5e0 | 456 | dentry_hash = f2fs_dentry_hash(name->name, name->len); |
6b4ea016 JK |
457 | level = 0; |
458 | current_depth = F2FS_I(dir)->i_current_depth; | |
459 | if (F2FS_I(dir)->chash == dentry_hash) { | |
460 | level = F2FS_I(dir)->clevel; | |
461 | F2FS_I(dir)->chash = 0; | |
462 | } | |
463 | ||
464 | start: | |
cfb271d4 | 465 | if (unlikely(current_depth == MAX_DIR_HASH_DEPTH)) |
6b4ea016 JK |
466 | return -ENOSPC; |
467 | ||
468 | /* Increase the depth, if required */ | |
469 | if (level == current_depth) | |
470 | ++current_depth; | |
471 | ||
38431545 | 472 | nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level); |
6b4ea016 JK |
473 | nblock = bucket_blocks(level); |
474 | ||
38431545 JK |
475 | bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level, |
476 | (le32_to_cpu(dentry_hash) % nbucket)); | |
6b4ea016 JK |
477 | |
478 | for (block = bidx; block <= (bidx + nblock - 1); block++) { | |
64aa7ed9 | 479 | dentry_page = get_new_data_page(dir, NULL, block, true); |
39936837 | 480 | if (IS_ERR(dentry_page)) |
6b4ea016 | 481 | return PTR_ERR(dentry_page); |
6b4ea016 JK |
482 | |
483 | dentry_blk = kmap(dentry_page); | |
484 | bit_pos = room_for_filename(dentry_blk, slots); | |
485 | if (bit_pos < NR_DENTRY_IN_BLOCK) | |
486 | goto add_dentry; | |
487 | ||
488 | kunmap(dentry_page); | |
489 | f2fs_put_page(dentry_page, 1); | |
6b4ea016 JK |
490 | } |
491 | ||
492 | /* Move to next level to find the empty slot for new dentry */ | |
493 | ++level; | |
494 | goto start; | |
495 | add_dentry: | |
3cb5ad15 | 496 | f2fs_wait_on_page_writeback(dentry_page, DATA); |
6b4ea016 | 497 | |
d928bfbf | 498 | down_write(&F2FS_I(inode)->i_sem); |
44a83ff6 JK |
499 | page = init_inode_metadata(inode, dir, name); |
500 | if (IS_ERR(page)) { | |
501 | err = PTR_ERR(page); | |
502 | goto fail; | |
503 | } | |
6b4ea016 | 504 | de = &dentry_blk->dentry[bit_pos]; |
25ca923b | 505 | de->hash_code = dentry_hash; |
6b4ea016 | 506 | de->name_len = cpu_to_le16(namelen); |
b7f7a5e0 | 507 | memcpy(dentry_blk->filename[bit_pos], name->name, name->len); |
6b4ea016 JK |
508 | de->ino = cpu_to_le32(inode->i_ino); |
509 | set_de_type(de, inode); | |
510 | for (i = 0; i < slots; i++) | |
511 | test_and_set_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap); | |
512 | set_page_dirty(dentry_page); | |
6666e6aa | 513 | |
44a83ff6 | 514 | /* we don't need to mark_inode_dirty now */ |
6666e6aa | 515 | F2FS_I(inode)->i_pino = dir->i_ino; |
44a83ff6 JK |
516 | update_inode(inode, page); |
517 | f2fs_put_page(page, 1); | |
518 | ||
519 | update_parent_metadata(dir, inode, current_depth); | |
6b4ea016 | 520 | fail: |
d928bfbf JK |
521 | up_write(&F2FS_I(inode)->i_sem); |
522 | ||
924a2ddb JK |
523 | if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR)) { |
524 | update_inode_page(dir); | |
525 | clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR); | |
526 | } | |
6b4ea016 JK |
527 | kunmap(dentry_page); |
528 | f2fs_put_page(dentry_page, 1); | |
6b4ea016 JK |
529 | return err; |
530 | } | |
531 | ||
0a8165d7 | 532 | /* |
6b4ea016 JK |
533 | * It only removes the dentry from the dentry page,corresponding name |
534 | * entry in name page does not need to be touched during deletion. | |
535 | */ | |
536 | void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page, | |
537 | struct inode *inode) | |
538 | { | |
539 | struct f2fs_dentry_block *dentry_blk; | |
540 | unsigned int bit_pos; | |
541 | struct address_space *mapping = page->mapping; | |
542 | struct inode *dir = mapping->host; | |
457d08ee | 543 | int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len)); |
6b4ea016 JK |
544 | void *kaddr = page_address(page); |
545 | int i; | |
546 | ||
6b4ea016 | 547 | lock_page(page); |
3cb5ad15 | 548 | f2fs_wait_on_page_writeback(page, DATA); |
6b4ea016 JK |
549 | |
550 | dentry_blk = (struct f2fs_dentry_block *)kaddr; | |
551 | bit_pos = dentry - (struct f2fs_dir_entry *)dentry_blk->dentry; | |
552 | for (i = 0; i < slots; i++) | |
553 | test_and_clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap); | |
554 | ||
555 | /* Let's check and deallocate this dentry page */ | |
556 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
557 | NR_DENTRY_IN_BLOCK, | |
558 | 0); | |
559 | kunmap(page); /* kunmap - pair of f2fs_find_entry */ | |
560 | set_page_dirty(page); | |
561 | ||
562 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; | |
563 | ||
6b4ea016 | 564 | if (inode) { |
1fe54f9d JK |
565 | struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb); |
566 | ||
d928bfbf JK |
567 | down_write(&F2FS_I(inode)->i_sem); |
568 | ||
e8dae604 JK |
569 | if (S_ISDIR(inode->i_mode)) { |
570 | drop_nlink(dir); | |
571 | update_inode_page(dir); | |
572 | } | |
16379987 | 573 | inode->i_ctime = CURRENT_TIME; |
6b4ea016 JK |
574 | drop_nlink(inode); |
575 | if (S_ISDIR(inode->i_mode)) { | |
576 | drop_nlink(inode); | |
577 | i_size_write(inode, 0); | |
578 | } | |
d928bfbf | 579 | up_write(&F2FS_I(inode)->i_sem); |
39936837 JK |
580 | update_inode_page(inode); |
581 | ||
6b4ea016 JK |
582 | if (inode->i_nlink == 0) |
583 | add_orphan_inode(sbi, inode->i_ino); | |
cbd56e7d JK |
584 | else |
585 | release_orphan_inode(sbi); | |
6b4ea016 JK |
586 | } |
587 | ||
588 | if (bit_pos == NR_DENTRY_IN_BLOCK) { | |
6b4ea016 JK |
589 | truncate_hole(dir, page->index, page->index + 1); |
590 | clear_page_dirty_for_io(page); | |
591 | ClearPageUptodate(page); | |
6b4ea016 | 592 | inode_dec_dirty_dents(dir); |
6b4ea016 | 593 | } |
508198be | 594 | f2fs_put_page(page, 1); |
6b4ea016 JK |
595 | } |
596 | ||
597 | bool f2fs_empty_dir(struct inode *dir) | |
598 | { | |
599 | unsigned long bidx; | |
600 | struct page *dentry_page; | |
601 | unsigned int bit_pos; | |
602 | struct f2fs_dentry_block *dentry_blk; | |
603 | unsigned long nblock = dir_blocks(dir); | |
604 | ||
605 | for (bidx = 0; bidx < nblock; bidx++) { | |
606 | void *kaddr; | |
607 | dentry_page = get_lock_data_page(dir, bidx); | |
608 | if (IS_ERR(dentry_page)) { | |
609 | if (PTR_ERR(dentry_page) == -ENOENT) | |
610 | continue; | |
611 | else | |
612 | return false; | |
613 | } | |
614 | ||
615 | kaddr = kmap_atomic(dentry_page); | |
616 | dentry_blk = (struct f2fs_dentry_block *)kaddr; | |
617 | if (bidx == 0) | |
618 | bit_pos = 2; | |
619 | else | |
620 | bit_pos = 0; | |
621 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
622 | NR_DENTRY_IN_BLOCK, | |
623 | bit_pos); | |
624 | kunmap_atomic(kaddr); | |
625 | ||
626 | f2fs_put_page(dentry_page, 1); | |
627 | ||
628 | if (bit_pos < NR_DENTRY_IN_BLOCK) | |
629 | return false; | |
630 | } | |
631 | return true; | |
632 | } | |
633 | ||
6f7f231e | 634 | static int f2fs_readdir(struct file *file, struct dir_context *ctx) |
6b4ea016 | 635 | { |
496ad9aa | 636 | struct inode *inode = file_inode(file); |
6b4ea016 | 637 | unsigned long npages = dir_blocks(inode); |
99b072bb | 638 | unsigned int bit_pos = 0; |
6b4ea016 JK |
639 | struct f2fs_dentry_block *dentry_blk = NULL; |
640 | struct f2fs_dir_entry *de = NULL; | |
641 | struct page *dentry_page = NULL; | |
817202d9 | 642 | struct file_ra_state *ra = &file->f_ra; |
6f7f231e | 643 | unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK); |
6b4ea016 | 644 | unsigned char d_type = DT_UNKNOWN; |
6b4ea016 | 645 | |
6f7f231e | 646 | bit_pos = ((unsigned long)ctx->pos % NR_DENTRY_IN_BLOCK); |
6b4ea016 | 647 | |
817202d9 CY |
648 | /* readahead for multi pages of dir */ |
649 | if (npages - n > 1 && !ra_has_index(ra, n)) | |
650 | page_cache_sync_readahead(inode->i_mapping, ra, file, n, | |
651 | min(npages - n, (pgoff_t)MAX_DIR_RA_PAGES)); | |
652 | ||
6c311ec6 | 653 | for (; n < npages; n++) { |
6b4ea016 JK |
654 | dentry_page = get_lock_data_page(inode, n); |
655 | if (IS_ERR(dentry_page)) | |
656 | continue; | |
657 | ||
6b4ea016 JK |
658 | dentry_blk = kmap(dentry_page); |
659 | while (bit_pos < NR_DENTRY_IN_BLOCK) { | |
6b4ea016 JK |
660 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, |
661 | NR_DENTRY_IN_BLOCK, | |
662 | bit_pos); | |
663 | if (bit_pos >= NR_DENTRY_IN_BLOCK) | |
664 | break; | |
665 | ||
666 | de = &dentry_blk->dentry[bit_pos]; | |
6f7f231e AV |
667 | if (de->file_type < F2FS_FT_MAX) |
668 | d_type = f2fs_filetype_table[de->file_type]; | |
669 | else | |
670 | d_type = DT_UNKNOWN; | |
671 | if (!dir_emit(ctx, | |
99b072bb JK |
672 | dentry_blk->filename[bit_pos], |
673 | le16_to_cpu(de->name_len), | |
674 | le32_to_cpu(de->ino), d_type)) | |
675 | goto stop; | |
676 | ||
677 | bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len)); | |
678 | ctx->pos = n * NR_DENTRY_IN_BLOCK + bit_pos; | |
6b4ea016 JK |
679 | } |
680 | bit_pos = 0; | |
6f7f231e | 681 | ctx->pos = (n + 1) * NR_DENTRY_IN_BLOCK; |
6b4ea016 JK |
682 | kunmap(dentry_page); |
683 | f2fs_put_page(dentry_page, 1); | |
684 | dentry_page = NULL; | |
685 | } | |
99b072bb | 686 | stop: |
6b4ea016 JK |
687 | if (dentry_page && !IS_ERR(dentry_page)) { |
688 | kunmap(dentry_page); | |
689 | f2fs_put_page(dentry_page, 1); | |
690 | } | |
691 | ||
692 | return 0; | |
693 | } | |
694 | ||
695 | const struct file_operations f2fs_dir_operations = { | |
696 | .llseek = generic_file_llseek, | |
697 | .read = generic_read_dir, | |
6f7f231e | 698 | .iterate = f2fs_readdir, |
6b4ea016 JK |
699 | .fsync = f2fs_sync_file, |
700 | .unlocked_ioctl = f2fs_ioctl, | |
701 | }; |