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 | ||
eee6160f GZ |
80 | static bool early_match_name(size_t namelen, f2fs_hash_t namehash, |
81 | struct f2fs_dir_entry *de) | |
6b4ea016 JK |
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, | |
eee6160f | 93 | struct qstr *name, 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]; |
eee6160f | 112 | if (early_match_name(name->len, namehash, de)) { |
6b4ea016 | 113 | if (!memcmp(dentry_blk->filename[bit_pos], |
eee6160f GZ |
114 | name->name, |
115 | name->len)) { | |
6b4ea016 JK |
116 | *res_page = dentry_page; |
117 | goto found; | |
118 | } | |
119 | } | |
5d0c6671 JK |
120 | if (max_len > *max_slots) { |
121 | *max_slots = max_len; | |
122 | max_len = 0; | |
123 | } | |
81e366f8 CY |
124 | |
125 | /* | |
126 | * For the most part, it should be a bug when name_len is zero. | |
127 | * We stop here for figuring out where the bugs are occurred. | |
128 | */ | |
129 | f2fs_bug_on(!de->name_len); | |
130 | ||
5d0c6671 | 131 | bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len)); |
6b4ea016 JK |
132 | } |
133 | ||
134 | de = NULL; | |
135 | kunmap(dentry_page); | |
136 | found: | |
5d0c6671 JK |
137 | if (max_len > *max_slots) |
138 | *max_slots = max_len; | |
6b4ea016 JK |
139 | return de; |
140 | } | |
141 | ||
142 | static struct f2fs_dir_entry *find_in_level(struct inode *dir, | |
eee6160f | 143 | unsigned int level, struct qstr *name, |
6b4ea016 JK |
144 | f2fs_hash_t namehash, struct page **res_page) |
145 | { | |
eee6160f | 146 | int s = GET_DENTRY_SLOTS(name->len); |
6b4ea016 JK |
147 | unsigned int nbucket, nblock; |
148 | unsigned int bidx, end_block; | |
149 | struct page *dentry_page; | |
150 | struct f2fs_dir_entry *de = NULL; | |
151 | bool room = false; | |
152 | int max_slots = 0; | |
153 | ||
5d56b671 | 154 | f2fs_bug_on(level > MAX_DIR_HASH_DEPTH); |
6b4ea016 | 155 | |
38431545 | 156 | nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level); |
6b4ea016 JK |
157 | nblock = bucket_blocks(level); |
158 | ||
38431545 JK |
159 | bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level, |
160 | le32_to_cpu(namehash) % nbucket); | |
6b4ea016 JK |
161 | end_block = bidx + nblock; |
162 | ||
163 | for (; bidx < end_block; bidx++) { | |
164 | /* no need to allocate new dentry pages to all the indices */ | |
c718379b | 165 | dentry_page = find_data_page(dir, bidx, true); |
6b4ea016 JK |
166 | if (IS_ERR(dentry_page)) { |
167 | room = true; | |
168 | continue; | |
169 | } | |
170 | ||
eee6160f GZ |
171 | de = find_in_block(dentry_page, name, &max_slots, |
172 | namehash, res_page); | |
6b4ea016 JK |
173 | if (de) |
174 | break; | |
175 | ||
176 | if (max_slots >= s) | |
177 | room = true; | |
178 | f2fs_put_page(dentry_page, 0); | |
179 | } | |
180 | ||
181 | if (!de && room && F2FS_I(dir)->chash != namehash) { | |
182 | F2FS_I(dir)->chash = namehash; | |
183 | F2FS_I(dir)->clevel = level; | |
184 | } | |
185 | ||
186 | return de; | |
187 | } | |
188 | ||
189 | /* | |
190 | * Find an entry in the specified directory with the wanted name. | |
191 | * It returns the page where the entry was found (as a parameter - res_page), | |
192 | * and the entry itself. Page is returned mapped and unlocked. | |
193 | * Entry is guaranteed to be valid. | |
194 | */ | |
195 | struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir, | |
196 | struct qstr *child, struct page **res_page) | |
197 | { | |
6b4ea016 JK |
198 | unsigned long npages = dir_blocks(dir); |
199 | struct f2fs_dir_entry *de = NULL; | |
200 | f2fs_hash_t name_hash; | |
201 | unsigned int max_depth; | |
202 | unsigned int level; | |
203 | ||
204 | if (npages == 0) | |
205 | return NULL; | |
206 | ||
207 | *res_page = NULL; | |
208 | ||
eee6160f | 209 | name_hash = f2fs_dentry_hash(child); |
6b4ea016 JK |
210 | max_depth = F2FS_I(dir)->i_current_depth; |
211 | ||
212 | for (level = 0; level < max_depth; level++) { | |
eee6160f | 213 | de = find_in_level(dir, level, child, name_hash, res_page); |
6b4ea016 JK |
214 | if (de) |
215 | break; | |
216 | } | |
217 | if (!de && F2FS_I(dir)->chash != name_hash) { | |
218 | F2FS_I(dir)->chash = name_hash; | |
219 | F2FS_I(dir)->clevel = level - 1; | |
220 | } | |
221 | return de; | |
222 | } | |
223 | ||
224 | struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p) | |
225 | { | |
4777f86b NJ |
226 | struct page *page; |
227 | struct f2fs_dir_entry *de; | |
228 | struct f2fs_dentry_block *dentry_blk; | |
6b4ea016 JK |
229 | |
230 | page = get_lock_data_page(dir, 0); | |
231 | if (IS_ERR(page)) | |
232 | return NULL; | |
233 | ||
234 | dentry_blk = kmap(page); | |
235 | de = &dentry_blk->dentry[1]; | |
236 | *p = page; | |
237 | unlock_page(page); | |
238 | return de; | |
239 | } | |
240 | ||
241 | ino_t f2fs_inode_by_name(struct inode *dir, struct qstr *qstr) | |
242 | { | |
243 | ino_t res = 0; | |
244 | struct f2fs_dir_entry *de; | |
245 | struct page *page; | |
246 | ||
247 | de = f2fs_find_entry(dir, qstr, &page); | |
248 | if (de) { | |
249 | res = le32_to_cpu(de->ino); | |
250 | kunmap(page); | |
251 | f2fs_put_page(page, 0); | |
252 | } | |
253 | ||
254 | return res; | |
255 | } | |
256 | ||
257 | void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de, | |
258 | struct page *page, struct inode *inode) | |
259 | { | |
6b4ea016 | 260 | lock_page(page); |
3cb5ad15 | 261 | f2fs_wait_on_page_writeback(page, DATA); |
6b4ea016 JK |
262 | de->ino = cpu_to_le32(inode->i_ino); |
263 | set_de_type(de, inode); | |
264 | kunmap(page); | |
265 | set_page_dirty(page); | |
266 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; | |
267 | mark_inode_dirty(dir); | |
6666e6aa | 268 | |
6b4ea016 | 269 | f2fs_put_page(page, 1); |
6b4ea016 JK |
270 | } |
271 | ||
44a83ff6 | 272 | static void init_dent_inode(const struct qstr *name, struct page *ipage) |
6b4ea016 | 273 | { |
58bfaf44 | 274 | struct f2fs_inode *ri; |
6b4ea016 | 275 | |
54b591df JK |
276 | f2fs_wait_on_page_writeback(ipage, NODE); |
277 | ||
53dc9a67 | 278 | /* copy name info. to this inode page */ |
58bfaf44 JK |
279 | ri = F2FS_INODE(ipage); |
280 | ri->i_namelen = cpu_to_le32(name->len); | |
281 | memcpy(ri->i_name, name->name, name->len); | |
6b4ea016 JK |
282 | set_page_dirty(ipage); |
283 | } | |
284 | ||
1cd14caf JK |
285 | int update_dent_inode(struct inode *inode, const struct qstr *name) |
286 | { | |
287 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
288 | struct page *page; | |
289 | ||
290 | page = get_node_page(sbi, inode->i_ino); | |
291 | if (IS_ERR(page)) | |
292 | return PTR_ERR(page); | |
293 | ||
294 | init_dent_inode(name, page); | |
295 | f2fs_put_page(page, 1); | |
296 | ||
297 | return 0; | |
298 | } | |
299 | ||
44a83ff6 JK |
300 | static int make_empty_dir(struct inode *inode, |
301 | struct inode *parent, struct page *page) | |
39936837 JK |
302 | { |
303 | struct page *dentry_page; | |
304 | struct f2fs_dentry_block *dentry_blk; | |
305 | struct f2fs_dir_entry *de; | |
39936837 | 306 | |
44a83ff6 | 307 | dentry_page = get_new_data_page(inode, page, 0, true); |
39936837 JK |
308 | if (IS_ERR(dentry_page)) |
309 | return PTR_ERR(dentry_page); | |
310 | ||
1c3bb978 GZ |
311 | |
312 | dentry_blk = kmap_atomic(dentry_page); | |
39936837 JK |
313 | |
314 | de = &dentry_blk->dentry[0]; | |
315 | de->name_len = cpu_to_le16(1); | |
316 | de->hash_code = 0; | |
317 | de->ino = cpu_to_le32(inode->i_ino); | |
318 | memcpy(dentry_blk->filename[0], ".", 1); | |
319 | set_de_type(de, inode); | |
320 | ||
321 | de = &dentry_blk->dentry[1]; | |
322 | de->hash_code = 0; | |
323 | de->name_len = cpu_to_le16(2); | |
324 | de->ino = cpu_to_le32(parent->i_ino); | |
325 | memcpy(dentry_blk->filename[1], "..", 2); | |
326 | set_de_type(de, inode); | |
327 | ||
328 | test_and_set_bit_le(0, &dentry_blk->dentry_bitmap); | |
329 | test_and_set_bit_le(1, &dentry_blk->dentry_bitmap); | |
1c3bb978 | 330 | kunmap_atomic(dentry_blk); |
39936837 JK |
331 | |
332 | set_page_dirty(dentry_page); | |
333 | f2fs_put_page(dentry_page, 1); | |
334 | return 0; | |
335 | } | |
336 | ||
44a83ff6 | 337 | static struct page *init_inode_metadata(struct inode *inode, |
69f24eac | 338 | struct inode *dir, const struct qstr *name) |
6b4ea016 | 339 | { |
50732df0 | 340 | struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb); |
44a83ff6 JK |
341 | struct page *page; |
342 | int err; | |
343 | ||
b97a9b5d | 344 | if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) { |
a014e037 | 345 | page = new_inode_page(inode); |
44a83ff6 JK |
346 | if (IS_ERR(page)) |
347 | return page; | |
6b4ea016 JK |
348 | |
349 | if (S_ISDIR(inode->i_mode)) { | |
44a83ff6 JK |
350 | err = make_empty_dir(inode, dir, page); |
351 | if (err) | |
352 | goto error; | |
6b4ea016 JK |
353 | } |
354 | ||
2ed2d5b3 | 355 | err = f2fs_init_acl(inode, dir, page); |
44a83ff6 | 356 | if (err) |
a8865372 | 357 | goto put_error; |
44a83ff6 | 358 | |
8ae8f162 JK |
359 | err = f2fs_init_security(inode, dir, name, page); |
360 | if (err) | |
a8865372 | 361 | goto put_error; |
6b4ea016 | 362 | } else { |
44a83ff6 JK |
363 | page = get_node_page(F2FS_SB(dir->i_sb), inode->i_ino); |
364 | if (IS_ERR(page)) | |
365 | return page; | |
366 | ||
44a83ff6 | 367 | set_cold_node(inode, page); |
6b4ea016 | 368 | } |
44a83ff6 | 369 | |
b97a9b5d JK |
370 | if (name) |
371 | init_dent_inode(name, page); | |
44a83ff6 | 372 | |
83d5d6f6 JK |
373 | /* |
374 | * This file should be checkpointed during fsync. | |
375 | * We lost i_pino from now on. | |
376 | */ | |
6b4ea016 | 377 | if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) { |
354a3399 | 378 | file_lost_pino(inode); |
50732df0 CY |
379 | /* |
380 | * If link the tmpfile to alias through linkat path, | |
381 | * we should remove this inode from orphan list. | |
382 | */ | |
383 | if (inode->i_nlink == 0) | |
384 | remove_orphan_inode(sbi, inode->i_ino); | |
6b4ea016 | 385 | inc_nlink(inode); |
6b4ea016 | 386 | } |
44a83ff6 JK |
387 | return page; |
388 | ||
a8865372 | 389 | put_error: |
44a83ff6 | 390 | f2fs_put_page(page, 1); |
90d72459 | 391 | error: |
bd859c65 JK |
392 | /* once the failed inode becomes a bad inode, i_mode is S_IFREG */ |
393 | truncate_inode_pages(&inode->i_data, 0); | |
394 | truncate_blocks(inode, 0); | |
395 | remove_dirty_dir_inode(inode); | |
44a83ff6 JK |
396 | remove_inode_page(inode); |
397 | return ERR_PTR(err); | |
6b4ea016 JK |
398 | } |
399 | ||
400 | static void update_parent_metadata(struct inode *dir, struct inode *inode, | |
401 | unsigned int current_depth) | |
402 | { | |
6b4ea016 JK |
403 | if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) { |
404 | if (S_ISDIR(inode->i_mode)) { | |
405 | inc_nlink(dir); | |
699489bb | 406 | set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR); |
6b4ea016 JK |
407 | } |
408 | clear_inode_flag(F2FS_I(inode), FI_NEW_INODE); | |
409 | } | |
410 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; | |
a18ff063 JK |
411 | mark_inode_dirty(dir); |
412 | ||
6b4ea016 JK |
413 | if (F2FS_I(dir)->i_current_depth != current_depth) { |
414 | F2FS_I(dir)->i_current_depth = current_depth; | |
699489bb | 415 | set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR); |
6b4ea016 JK |
416 | } |
417 | ||
6b4ea016 JK |
418 | if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) |
419 | clear_inode_flag(F2FS_I(inode), FI_INC_LINK); | |
420 | } | |
421 | ||
422 | static int room_for_filename(struct f2fs_dentry_block *dentry_blk, int slots) | |
423 | { | |
424 | int bit_start = 0; | |
425 | int zero_start, zero_end; | |
426 | next: | |
427 | zero_start = find_next_zero_bit_le(&dentry_blk->dentry_bitmap, | |
428 | NR_DENTRY_IN_BLOCK, | |
429 | bit_start); | |
430 | if (zero_start >= NR_DENTRY_IN_BLOCK) | |
431 | return NR_DENTRY_IN_BLOCK; | |
432 | ||
433 | zero_end = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
434 | NR_DENTRY_IN_BLOCK, | |
435 | zero_start); | |
436 | if (zero_end - zero_start >= slots) | |
437 | return zero_start; | |
438 | ||
439 | bit_start = zero_end + 1; | |
440 | ||
441 | if (zero_end + 1 >= NR_DENTRY_IN_BLOCK) | |
442 | return NR_DENTRY_IN_BLOCK; | |
443 | goto next; | |
444 | } | |
445 | ||
39936837 | 446 | /* |
4f4124d0 CY |
447 | * Caller should grab and release a rwsem by calling f2fs_lock_op() and |
448 | * f2fs_unlock_op(). | |
39936837 | 449 | */ |
6c311ec6 CF |
450 | int __f2fs_add_link(struct inode *dir, const struct qstr *name, |
451 | struct inode *inode) | |
6b4ea016 JK |
452 | { |
453 | unsigned int bit_pos; | |
454 | unsigned int level; | |
455 | unsigned int current_depth; | |
456 | unsigned long bidx, block; | |
457 | f2fs_hash_t dentry_hash; | |
458 | struct f2fs_dir_entry *de; | |
459 | unsigned int nbucket, nblock; | |
b7f7a5e0 | 460 | size_t namelen = name->len; |
6b4ea016 JK |
461 | struct page *dentry_page = NULL; |
462 | struct f2fs_dentry_block *dentry_blk = NULL; | |
457d08ee | 463 | int slots = GET_DENTRY_SLOTS(namelen); |
44a83ff6 | 464 | struct page *page; |
6b4ea016 JK |
465 | int err = 0; |
466 | int i; | |
467 | ||
eee6160f | 468 | dentry_hash = f2fs_dentry_hash(name); |
6b4ea016 JK |
469 | level = 0; |
470 | current_depth = F2FS_I(dir)->i_current_depth; | |
471 | if (F2FS_I(dir)->chash == dentry_hash) { | |
472 | level = F2FS_I(dir)->clevel; | |
473 | F2FS_I(dir)->chash = 0; | |
474 | } | |
475 | ||
476 | start: | |
cfb271d4 | 477 | if (unlikely(current_depth == MAX_DIR_HASH_DEPTH)) |
6b4ea016 JK |
478 | return -ENOSPC; |
479 | ||
480 | /* Increase the depth, if required */ | |
481 | if (level == current_depth) | |
482 | ++current_depth; | |
483 | ||
38431545 | 484 | nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level); |
6b4ea016 JK |
485 | nblock = bucket_blocks(level); |
486 | ||
38431545 JK |
487 | bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level, |
488 | (le32_to_cpu(dentry_hash) % nbucket)); | |
6b4ea016 JK |
489 | |
490 | for (block = bidx; block <= (bidx + nblock - 1); block++) { | |
64aa7ed9 | 491 | dentry_page = get_new_data_page(dir, NULL, block, true); |
39936837 | 492 | if (IS_ERR(dentry_page)) |
6b4ea016 | 493 | return PTR_ERR(dentry_page); |
6b4ea016 JK |
494 | |
495 | dentry_blk = kmap(dentry_page); | |
496 | bit_pos = room_for_filename(dentry_blk, slots); | |
497 | if (bit_pos < NR_DENTRY_IN_BLOCK) | |
498 | goto add_dentry; | |
499 | ||
500 | kunmap(dentry_page); | |
501 | f2fs_put_page(dentry_page, 1); | |
6b4ea016 JK |
502 | } |
503 | ||
504 | /* Move to next level to find the empty slot for new dentry */ | |
505 | ++level; | |
506 | goto start; | |
507 | add_dentry: | |
3cb5ad15 | 508 | f2fs_wait_on_page_writeback(dentry_page, DATA); |
6b4ea016 | 509 | |
d928bfbf | 510 | down_write(&F2FS_I(inode)->i_sem); |
44a83ff6 JK |
511 | page = init_inode_metadata(inode, dir, name); |
512 | if (IS_ERR(page)) { | |
513 | err = PTR_ERR(page); | |
514 | goto fail; | |
515 | } | |
6b4ea016 | 516 | de = &dentry_blk->dentry[bit_pos]; |
25ca923b | 517 | de->hash_code = dentry_hash; |
6b4ea016 | 518 | de->name_len = cpu_to_le16(namelen); |
b7f7a5e0 | 519 | memcpy(dentry_blk->filename[bit_pos], name->name, name->len); |
6b4ea016 JK |
520 | de->ino = cpu_to_le32(inode->i_ino); |
521 | set_de_type(de, inode); | |
522 | for (i = 0; i < slots; i++) | |
523 | test_and_set_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap); | |
524 | set_page_dirty(dentry_page); | |
6666e6aa | 525 | |
44a83ff6 | 526 | /* we don't need to mark_inode_dirty now */ |
6666e6aa | 527 | F2FS_I(inode)->i_pino = dir->i_ino; |
44a83ff6 JK |
528 | update_inode(inode, page); |
529 | f2fs_put_page(page, 1); | |
530 | ||
531 | update_parent_metadata(dir, inode, current_depth); | |
6b4ea016 | 532 | fail: |
d928bfbf JK |
533 | up_write(&F2FS_I(inode)->i_sem); |
534 | ||
924a2ddb JK |
535 | if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR)) { |
536 | update_inode_page(dir); | |
537 | clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR); | |
538 | } | |
6b4ea016 JK |
539 | kunmap(dentry_page); |
540 | f2fs_put_page(dentry_page, 1); | |
6b4ea016 JK |
541 | return err; |
542 | } | |
543 | ||
b97a9b5d JK |
544 | int f2fs_do_tmpfile(struct inode *inode, struct inode *dir) |
545 | { | |
546 | struct page *page; | |
547 | int err = 0; | |
548 | ||
549 | down_write(&F2FS_I(inode)->i_sem); | |
550 | page = init_inode_metadata(inode, dir, NULL); | |
551 | if (IS_ERR(page)) { | |
552 | err = PTR_ERR(page); | |
553 | goto fail; | |
554 | } | |
555 | /* we don't need to mark_inode_dirty now */ | |
556 | update_inode(inode, page); | |
557 | f2fs_put_page(page, 1); | |
558 | ||
559 | clear_inode_flag(F2FS_I(inode), FI_NEW_INODE); | |
560 | fail: | |
561 | up_write(&F2FS_I(inode)->i_sem); | |
562 | return err; | |
563 | } | |
564 | ||
0a8165d7 | 565 | /* |
6b4ea016 JK |
566 | * It only removes the dentry from the dentry page,corresponding name |
567 | * entry in name page does not need to be touched during deletion. | |
568 | */ | |
569 | void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page, | |
570 | struct inode *inode) | |
571 | { | |
572 | struct f2fs_dentry_block *dentry_blk; | |
573 | unsigned int bit_pos; | |
574 | struct address_space *mapping = page->mapping; | |
575 | struct inode *dir = mapping->host; | |
457d08ee | 576 | int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len)); |
6b4ea016 JK |
577 | int i; |
578 | ||
6b4ea016 | 579 | lock_page(page); |
3cb5ad15 | 580 | f2fs_wait_on_page_writeback(page, DATA); |
6b4ea016 | 581 | |
1c3bb978 GZ |
582 | dentry_blk = page_address(page); |
583 | bit_pos = dentry - dentry_blk->dentry; | |
6b4ea016 JK |
584 | for (i = 0; i < slots; i++) |
585 | test_and_clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap); | |
586 | ||
587 | /* Let's check and deallocate this dentry page */ | |
588 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
589 | NR_DENTRY_IN_BLOCK, | |
590 | 0); | |
591 | kunmap(page); /* kunmap - pair of f2fs_find_entry */ | |
592 | set_page_dirty(page); | |
593 | ||
594 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; | |
595 | ||
6b4ea016 | 596 | if (inode) { |
1fe54f9d JK |
597 | struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb); |
598 | ||
d928bfbf JK |
599 | down_write(&F2FS_I(inode)->i_sem); |
600 | ||
e8dae604 JK |
601 | if (S_ISDIR(inode->i_mode)) { |
602 | drop_nlink(dir); | |
603 | update_inode_page(dir); | |
604 | } | |
16379987 | 605 | inode->i_ctime = CURRENT_TIME; |
6b4ea016 JK |
606 | drop_nlink(inode); |
607 | if (S_ISDIR(inode->i_mode)) { | |
608 | drop_nlink(inode); | |
609 | i_size_write(inode, 0); | |
610 | } | |
d928bfbf | 611 | up_write(&F2FS_I(inode)->i_sem); |
39936837 JK |
612 | update_inode_page(inode); |
613 | ||
6b4ea016 JK |
614 | if (inode->i_nlink == 0) |
615 | add_orphan_inode(sbi, inode->i_ino); | |
cbd56e7d JK |
616 | else |
617 | release_orphan_inode(sbi); | |
6b4ea016 JK |
618 | } |
619 | ||
620 | if (bit_pos == NR_DENTRY_IN_BLOCK) { | |
6b4ea016 JK |
621 | truncate_hole(dir, page->index, page->index + 1); |
622 | clear_page_dirty_for_io(page); | |
623 | ClearPageUptodate(page); | |
6b4ea016 | 624 | inode_dec_dirty_dents(dir); |
6b4ea016 | 625 | } |
508198be | 626 | f2fs_put_page(page, 1); |
6b4ea016 JK |
627 | } |
628 | ||
629 | bool f2fs_empty_dir(struct inode *dir) | |
630 | { | |
631 | unsigned long bidx; | |
632 | struct page *dentry_page; | |
633 | unsigned int bit_pos; | |
634 | struct f2fs_dentry_block *dentry_blk; | |
635 | unsigned long nblock = dir_blocks(dir); | |
636 | ||
637 | for (bidx = 0; bidx < nblock; bidx++) { | |
6b4ea016 JK |
638 | dentry_page = get_lock_data_page(dir, bidx); |
639 | if (IS_ERR(dentry_page)) { | |
640 | if (PTR_ERR(dentry_page) == -ENOENT) | |
641 | continue; | |
642 | else | |
643 | return false; | |
644 | } | |
645 | ||
1c3bb978 GZ |
646 | |
647 | dentry_blk = kmap_atomic(dentry_page); | |
6b4ea016 JK |
648 | if (bidx == 0) |
649 | bit_pos = 2; | |
650 | else | |
651 | bit_pos = 0; | |
652 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
653 | NR_DENTRY_IN_BLOCK, | |
654 | bit_pos); | |
1c3bb978 | 655 | kunmap_atomic(dentry_blk); |
6b4ea016 JK |
656 | |
657 | f2fs_put_page(dentry_page, 1); | |
658 | ||
659 | if (bit_pos < NR_DENTRY_IN_BLOCK) | |
660 | return false; | |
661 | } | |
662 | return true; | |
663 | } | |
664 | ||
6f7f231e | 665 | static int f2fs_readdir(struct file *file, struct dir_context *ctx) |
6b4ea016 | 666 | { |
496ad9aa | 667 | struct inode *inode = file_inode(file); |
6b4ea016 | 668 | unsigned long npages = dir_blocks(inode); |
99b072bb | 669 | unsigned int bit_pos = 0; |
6b4ea016 JK |
670 | struct f2fs_dentry_block *dentry_blk = NULL; |
671 | struct f2fs_dir_entry *de = NULL; | |
672 | struct page *dentry_page = NULL; | |
817202d9 | 673 | struct file_ra_state *ra = &file->f_ra; |
6f7f231e | 674 | unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK); |
6b4ea016 | 675 | unsigned char d_type = DT_UNKNOWN; |
6b4ea016 | 676 | |
6f7f231e | 677 | bit_pos = ((unsigned long)ctx->pos % NR_DENTRY_IN_BLOCK); |
6b4ea016 | 678 | |
817202d9 CY |
679 | /* readahead for multi pages of dir */ |
680 | if (npages - n > 1 && !ra_has_index(ra, n)) | |
681 | page_cache_sync_readahead(inode->i_mapping, ra, file, n, | |
682 | min(npages - n, (pgoff_t)MAX_DIR_RA_PAGES)); | |
683 | ||
6c311ec6 | 684 | for (; n < npages; n++) { |
6b4ea016 JK |
685 | dentry_page = get_lock_data_page(inode, n); |
686 | if (IS_ERR(dentry_page)) | |
687 | continue; | |
688 | ||
6b4ea016 JK |
689 | dentry_blk = kmap(dentry_page); |
690 | while (bit_pos < NR_DENTRY_IN_BLOCK) { | |
6b4ea016 JK |
691 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, |
692 | NR_DENTRY_IN_BLOCK, | |
693 | bit_pos); | |
694 | if (bit_pos >= NR_DENTRY_IN_BLOCK) | |
695 | break; | |
696 | ||
697 | de = &dentry_blk->dentry[bit_pos]; | |
6f7f231e AV |
698 | if (de->file_type < F2FS_FT_MAX) |
699 | d_type = f2fs_filetype_table[de->file_type]; | |
700 | else | |
701 | d_type = DT_UNKNOWN; | |
702 | if (!dir_emit(ctx, | |
99b072bb JK |
703 | dentry_blk->filename[bit_pos], |
704 | le16_to_cpu(de->name_len), | |
705 | le32_to_cpu(de->ino), d_type)) | |
706 | goto stop; | |
707 | ||
708 | bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len)); | |
709 | ctx->pos = n * NR_DENTRY_IN_BLOCK + bit_pos; | |
6b4ea016 JK |
710 | } |
711 | bit_pos = 0; | |
6f7f231e | 712 | ctx->pos = (n + 1) * NR_DENTRY_IN_BLOCK; |
6b4ea016 JK |
713 | kunmap(dentry_page); |
714 | f2fs_put_page(dentry_page, 1); | |
715 | dentry_page = NULL; | |
716 | } | |
99b072bb | 717 | stop: |
6b4ea016 JK |
718 | if (dentry_page && !IS_ERR(dentry_page)) { |
719 | kunmap(dentry_page); | |
720 | f2fs_put_page(dentry_page, 1); | |
721 | } | |
722 | ||
723 | return 0; | |
724 | } | |
725 | ||
726 | const struct file_operations f2fs_dir_operations = { | |
727 | .llseek = generic_file_llseek, | |
728 | .read = generic_read_dir, | |
6f7f231e | 729 | .iterate = f2fs_readdir, |
6b4ea016 JK |
730 | .fsync = f2fs_sync_file, |
731 | .unlocked_ioctl = f2fs_ioctl, | |
732 | }; |