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 | ||
dbeacf02 | 40 | unsigned char f2fs_filetype_table[F2FS_FT_MAX] = { |
6b4ea016 JK |
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 | ||
dbeacf02 | 62 | void set_de_type(struct f2fs_dir_entry *de, struct inode *inode) |
6b4ea016 | 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 | ||
dbeacf02 | 80 | bool early_match_name(size_t namelen, f2fs_hash_t namehash, |
eee6160f | 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. | |
e1c42045 | 127 | * We stop here for figuring out where the bugs has occurred. |
81e366f8 | 128 | */ |
9850cf4a | 129 | f2fs_bug_on(F2FS_P_SB(dentry_page), !de->name_len); |
81e366f8 | 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 | ||
9850cf4a | 154 | f2fs_bug_on(F2FS_I_SB(dir), 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 | ||
622f28ae CY |
204 | if (f2fs_has_inline_dentry(dir)) |
205 | return find_in_inline_dir(dir, child, res_page); | |
206 | ||
6b4ea016 JK |
207 | if (npages == 0) |
208 | return NULL; | |
209 | ||
210 | *res_page = NULL; | |
211 | ||
eee6160f | 212 | name_hash = f2fs_dentry_hash(child); |
6b4ea016 JK |
213 | max_depth = F2FS_I(dir)->i_current_depth; |
214 | ||
215 | for (level = 0; level < max_depth; level++) { | |
eee6160f | 216 | de = find_in_level(dir, level, child, name_hash, res_page); |
6b4ea016 JK |
217 | if (de) |
218 | break; | |
219 | } | |
220 | if (!de && F2FS_I(dir)->chash != name_hash) { | |
221 | F2FS_I(dir)->chash = name_hash; | |
222 | F2FS_I(dir)->clevel = level - 1; | |
223 | } | |
224 | return de; | |
225 | } | |
226 | ||
227 | struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p) | |
228 | { | |
4777f86b NJ |
229 | struct page *page; |
230 | struct f2fs_dir_entry *de; | |
231 | struct f2fs_dentry_block *dentry_blk; | |
6b4ea016 | 232 | |
622f28ae CY |
233 | if (f2fs_has_inline_dentry(dir)) |
234 | return f2fs_parent_inline_dir(dir, p); | |
235 | ||
6b4ea016 JK |
236 | page = get_lock_data_page(dir, 0); |
237 | if (IS_ERR(page)) | |
238 | return NULL; | |
239 | ||
240 | dentry_blk = kmap(page); | |
241 | de = &dentry_blk->dentry[1]; | |
242 | *p = page; | |
243 | unlock_page(page); | |
244 | return de; | |
245 | } | |
246 | ||
247 | ino_t f2fs_inode_by_name(struct inode *dir, struct qstr *qstr) | |
248 | { | |
249 | ino_t res = 0; | |
250 | struct f2fs_dir_entry *de; | |
251 | struct page *page; | |
252 | ||
253 | de = f2fs_find_entry(dir, qstr, &page); | |
254 | if (de) { | |
255 | res = le32_to_cpu(de->ino); | |
622f28ae CY |
256 | if (!f2fs_has_inline_dentry(dir)) |
257 | kunmap(page); | |
6b4ea016 JK |
258 | f2fs_put_page(page, 0); |
259 | } | |
260 | ||
261 | return res; | |
262 | } | |
263 | ||
264 | void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de, | |
265 | struct page *page, struct inode *inode) | |
266 | { | |
6b4ea016 | 267 | lock_page(page); |
3cb5ad15 | 268 | f2fs_wait_on_page_writeback(page, DATA); |
6b4ea016 JK |
269 | de->ino = cpu_to_le32(inode->i_ino); |
270 | set_de_type(de, inode); | |
622f28ae CY |
271 | if (!f2fs_has_inline_dentry(dir)) |
272 | kunmap(page); | |
6b4ea016 JK |
273 | set_page_dirty(page); |
274 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; | |
275 | mark_inode_dirty(dir); | |
6666e6aa | 276 | |
6b4ea016 | 277 | f2fs_put_page(page, 1); |
6b4ea016 JK |
278 | } |
279 | ||
44a83ff6 | 280 | static void init_dent_inode(const struct qstr *name, struct page *ipage) |
6b4ea016 | 281 | { |
58bfaf44 | 282 | struct f2fs_inode *ri; |
6b4ea016 | 283 | |
54b591df JK |
284 | f2fs_wait_on_page_writeback(ipage, NODE); |
285 | ||
53dc9a67 | 286 | /* copy name info. to this inode page */ |
58bfaf44 JK |
287 | ri = F2FS_INODE(ipage); |
288 | ri->i_namelen = cpu_to_le32(name->len); | |
289 | memcpy(ri->i_name, name->name, name->len); | |
6b4ea016 JK |
290 | set_page_dirty(ipage); |
291 | } | |
292 | ||
1cd14caf JK |
293 | int update_dent_inode(struct inode *inode, const struct qstr *name) |
294 | { | |
1cd14caf JK |
295 | struct page *page; |
296 | ||
4081363f | 297 | page = get_node_page(F2FS_I_SB(inode), inode->i_ino); |
1cd14caf JK |
298 | if (IS_ERR(page)) |
299 | return PTR_ERR(page); | |
300 | ||
301 | init_dent_inode(name, page); | |
302 | f2fs_put_page(page, 1); | |
303 | ||
304 | return 0; | |
305 | } | |
306 | ||
44a83ff6 JK |
307 | static int make_empty_dir(struct inode *inode, |
308 | struct inode *parent, struct page *page) | |
39936837 JK |
309 | { |
310 | struct page *dentry_page; | |
311 | struct f2fs_dentry_block *dentry_blk; | |
312 | struct f2fs_dir_entry *de; | |
39936837 | 313 | |
622f28ae CY |
314 | if (f2fs_has_inline_dentry(inode)) |
315 | return make_empty_inline_dir(inode, parent, page); | |
316 | ||
44a83ff6 | 317 | dentry_page = get_new_data_page(inode, page, 0, true); |
39936837 JK |
318 | if (IS_ERR(dentry_page)) |
319 | return PTR_ERR(dentry_page); | |
320 | ||
1c3bb978 | 321 | dentry_blk = kmap_atomic(dentry_page); |
39936837 JK |
322 | |
323 | de = &dentry_blk->dentry[0]; | |
324 | de->name_len = cpu_to_le16(1); | |
325 | de->hash_code = 0; | |
326 | de->ino = cpu_to_le32(inode->i_ino); | |
327 | memcpy(dentry_blk->filename[0], ".", 1); | |
328 | set_de_type(de, inode); | |
329 | ||
330 | de = &dentry_blk->dentry[1]; | |
331 | de->hash_code = 0; | |
332 | de->name_len = cpu_to_le16(2); | |
333 | de->ino = cpu_to_le32(parent->i_ino); | |
334 | memcpy(dentry_blk->filename[1], "..", 2); | |
335 | set_de_type(de, inode); | |
336 | ||
337 | test_and_set_bit_le(0, &dentry_blk->dentry_bitmap); | |
338 | test_and_set_bit_le(1, &dentry_blk->dentry_bitmap); | |
1c3bb978 | 339 | kunmap_atomic(dentry_blk); |
39936837 JK |
340 | |
341 | set_page_dirty(dentry_page); | |
342 | f2fs_put_page(dentry_page, 1); | |
343 | return 0; | |
344 | } | |
345 | ||
dbeacf02 | 346 | struct page *init_inode_metadata(struct inode *inode, |
69f24eac | 347 | struct inode *dir, const struct qstr *name) |
6b4ea016 | 348 | { |
44a83ff6 JK |
349 | struct page *page; |
350 | int err; | |
351 | ||
b97a9b5d | 352 | if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) { |
a014e037 | 353 | page = new_inode_page(inode); |
44a83ff6 JK |
354 | if (IS_ERR(page)) |
355 | return page; | |
6b4ea016 JK |
356 | |
357 | if (S_ISDIR(inode->i_mode)) { | |
44a83ff6 JK |
358 | err = make_empty_dir(inode, dir, page); |
359 | if (err) | |
360 | goto error; | |
6b4ea016 JK |
361 | } |
362 | ||
2ed2d5b3 | 363 | err = f2fs_init_acl(inode, dir, page); |
44a83ff6 | 364 | if (err) |
a8865372 | 365 | goto put_error; |
44a83ff6 | 366 | |
8ae8f162 JK |
367 | err = f2fs_init_security(inode, dir, name, page); |
368 | if (err) | |
a8865372 | 369 | goto put_error; |
6b4ea016 | 370 | } else { |
4081363f | 371 | page = get_node_page(F2FS_I_SB(dir), inode->i_ino); |
44a83ff6 JK |
372 | if (IS_ERR(page)) |
373 | return page; | |
374 | ||
44a83ff6 | 375 | set_cold_node(inode, page); |
6b4ea016 | 376 | } |
44a83ff6 | 377 | |
b97a9b5d JK |
378 | if (name) |
379 | init_dent_inode(name, page); | |
44a83ff6 | 380 | |
83d5d6f6 JK |
381 | /* |
382 | * This file should be checkpointed during fsync. | |
383 | * We lost i_pino from now on. | |
384 | */ | |
6b4ea016 | 385 | if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) { |
354a3399 | 386 | file_lost_pino(inode); |
50732df0 CY |
387 | /* |
388 | * If link the tmpfile to alias through linkat path, | |
389 | * we should remove this inode from orphan list. | |
390 | */ | |
391 | if (inode->i_nlink == 0) | |
4081363f | 392 | remove_orphan_inode(F2FS_I_SB(dir), inode->i_ino); |
6b4ea016 | 393 | inc_nlink(inode); |
6b4ea016 | 394 | } |
44a83ff6 JK |
395 | return page; |
396 | ||
a8865372 | 397 | put_error: |
44a83ff6 | 398 | f2fs_put_page(page, 1); |
90d72459 | 399 | error: |
bd859c65 JK |
400 | /* once the failed inode becomes a bad inode, i_mode is S_IFREG */ |
401 | truncate_inode_pages(&inode->i_data, 0); | |
764aa3e9 | 402 | truncate_blocks(inode, 0, false); |
bd859c65 | 403 | remove_dirty_dir_inode(inode); |
44a83ff6 JK |
404 | remove_inode_page(inode); |
405 | return ERR_PTR(err); | |
6b4ea016 JK |
406 | } |
407 | ||
dbeacf02 | 408 | void update_parent_metadata(struct inode *dir, struct inode *inode, |
6b4ea016 JK |
409 | unsigned int current_depth) |
410 | { | |
6b4ea016 JK |
411 | if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) { |
412 | if (S_ISDIR(inode->i_mode)) { | |
413 | inc_nlink(dir); | |
699489bb | 414 | set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR); |
6b4ea016 JK |
415 | } |
416 | clear_inode_flag(F2FS_I(inode), FI_NEW_INODE); | |
417 | } | |
418 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; | |
a18ff063 JK |
419 | mark_inode_dirty(dir); |
420 | ||
6b4ea016 JK |
421 | if (F2FS_I(dir)->i_current_depth != current_depth) { |
422 | F2FS_I(dir)->i_current_depth = current_depth; | |
699489bb | 423 | set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR); |
6b4ea016 JK |
424 | } |
425 | ||
6b4ea016 JK |
426 | if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) |
427 | clear_inode_flag(F2FS_I(inode), FI_INC_LINK); | |
428 | } | |
429 | ||
a82afa20 | 430 | int room_for_filename(const void *bitmap, int slots, int max_slots) |
6b4ea016 JK |
431 | { |
432 | int bit_start = 0; | |
433 | int zero_start, zero_end; | |
434 | next: | |
a82afa20 JK |
435 | zero_start = find_next_zero_bit_le(bitmap, max_slots, bit_start); |
436 | if (zero_start >= max_slots) | |
437 | return max_slots; | |
438 | ||
439 | zero_end = find_next_bit_le(bitmap, max_slots, zero_start); | |
6b4ea016 JK |
440 | if (zero_end - zero_start >= slots) |
441 | return zero_start; | |
442 | ||
443 | bit_start = zero_end + 1; | |
444 | ||
a82afa20 JK |
445 | if (zero_end + 1 >= max_slots) |
446 | return max_slots; | |
6b4ea016 JK |
447 | goto next; |
448 | } | |
449 | ||
39936837 | 450 | /* |
4f4124d0 CY |
451 | * Caller should grab and release a rwsem by calling f2fs_lock_op() and |
452 | * f2fs_unlock_op(). | |
39936837 | 453 | */ |
6c311ec6 CF |
454 | int __f2fs_add_link(struct inode *dir, const struct qstr *name, |
455 | struct inode *inode) | |
6b4ea016 JK |
456 | { |
457 | unsigned int bit_pos; | |
458 | unsigned int level; | |
459 | unsigned int current_depth; | |
460 | unsigned long bidx, block; | |
461 | f2fs_hash_t dentry_hash; | |
462 | struct f2fs_dir_entry *de; | |
463 | unsigned int nbucket, nblock; | |
b7f7a5e0 | 464 | size_t namelen = name->len; |
6b4ea016 JK |
465 | struct page *dentry_page = NULL; |
466 | struct f2fs_dentry_block *dentry_blk = NULL; | |
457d08ee | 467 | int slots = GET_DENTRY_SLOTS(namelen); |
44a83ff6 | 468 | struct page *page; |
6b4ea016 JK |
469 | int err = 0; |
470 | int i; | |
471 | ||
622f28ae CY |
472 | if (f2fs_has_inline_dentry(dir)) { |
473 | err = f2fs_add_inline_entry(dir, name, inode); | |
474 | if (!err || err != -EAGAIN) | |
475 | return err; | |
476 | else | |
477 | err = 0; | |
478 | } | |
479 | ||
eee6160f | 480 | dentry_hash = f2fs_dentry_hash(name); |
6b4ea016 JK |
481 | level = 0; |
482 | current_depth = F2FS_I(dir)->i_current_depth; | |
483 | if (F2FS_I(dir)->chash == dentry_hash) { | |
484 | level = F2FS_I(dir)->clevel; | |
485 | F2FS_I(dir)->chash = 0; | |
486 | } | |
487 | ||
488 | start: | |
cfb271d4 | 489 | if (unlikely(current_depth == MAX_DIR_HASH_DEPTH)) |
6b4ea016 JK |
490 | return -ENOSPC; |
491 | ||
492 | /* Increase the depth, if required */ | |
493 | if (level == current_depth) | |
494 | ++current_depth; | |
495 | ||
38431545 | 496 | nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level); |
6b4ea016 JK |
497 | nblock = bucket_blocks(level); |
498 | ||
38431545 JK |
499 | bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level, |
500 | (le32_to_cpu(dentry_hash) % nbucket)); | |
6b4ea016 JK |
501 | |
502 | for (block = bidx; block <= (bidx + nblock - 1); block++) { | |
64aa7ed9 | 503 | dentry_page = get_new_data_page(dir, NULL, block, true); |
39936837 | 504 | if (IS_ERR(dentry_page)) |
6b4ea016 | 505 | return PTR_ERR(dentry_page); |
6b4ea016 JK |
506 | |
507 | dentry_blk = kmap(dentry_page); | |
a82afa20 JK |
508 | bit_pos = room_for_filename(&dentry_blk->dentry_bitmap, |
509 | slots, NR_DENTRY_IN_BLOCK); | |
6b4ea016 JK |
510 | if (bit_pos < NR_DENTRY_IN_BLOCK) |
511 | goto add_dentry; | |
512 | ||
513 | kunmap(dentry_page); | |
514 | f2fs_put_page(dentry_page, 1); | |
6b4ea016 JK |
515 | } |
516 | ||
517 | /* Move to next level to find the empty slot for new dentry */ | |
518 | ++level; | |
519 | goto start; | |
520 | add_dentry: | |
3cb5ad15 | 521 | f2fs_wait_on_page_writeback(dentry_page, DATA); |
6b4ea016 | 522 | |
d928bfbf | 523 | down_write(&F2FS_I(inode)->i_sem); |
44a83ff6 JK |
524 | page = init_inode_metadata(inode, dir, name); |
525 | if (IS_ERR(page)) { | |
526 | err = PTR_ERR(page); | |
527 | goto fail; | |
528 | } | |
6b4ea016 | 529 | de = &dentry_blk->dentry[bit_pos]; |
25ca923b | 530 | de->hash_code = dentry_hash; |
6b4ea016 | 531 | de->name_len = cpu_to_le16(namelen); |
b7f7a5e0 | 532 | memcpy(dentry_blk->filename[bit_pos], name->name, name->len); |
6b4ea016 JK |
533 | de->ino = cpu_to_le32(inode->i_ino); |
534 | set_de_type(de, inode); | |
535 | for (i = 0; i < slots; i++) | |
536 | test_and_set_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap); | |
537 | set_page_dirty(dentry_page); | |
6666e6aa | 538 | |
44a83ff6 | 539 | /* we don't need to mark_inode_dirty now */ |
6666e6aa | 540 | F2FS_I(inode)->i_pino = dir->i_ino; |
44a83ff6 JK |
541 | update_inode(inode, page); |
542 | f2fs_put_page(page, 1); | |
543 | ||
544 | update_parent_metadata(dir, inode, current_depth); | |
6b4ea016 | 545 | fail: |
d928bfbf JK |
546 | up_write(&F2FS_I(inode)->i_sem); |
547 | ||
924a2ddb JK |
548 | if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR)) { |
549 | update_inode_page(dir); | |
550 | clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR); | |
551 | } | |
6b4ea016 JK |
552 | kunmap(dentry_page); |
553 | f2fs_put_page(dentry_page, 1); | |
6b4ea016 JK |
554 | return err; |
555 | } | |
556 | ||
b97a9b5d JK |
557 | int f2fs_do_tmpfile(struct inode *inode, struct inode *dir) |
558 | { | |
559 | struct page *page; | |
560 | int err = 0; | |
561 | ||
562 | down_write(&F2FS_I(inode)->i_sem); | |
563 | page = init_inode_metadata(inode, dir, NULL); | |
564 | if (IS_ERR(page)) { | |
565 | err = PTR_ERR(page); | |
566 | goto fail; | |
567 | } | |
568 | /* we don't need to mark_inode_dirty now */ | |
569 | update_inode(inode, page); | |
570 | f2fs_put_page(page, 1); | |
571 | ||
572 | clear_inode_flag(F2FS_I(inode), FI_NEW_INODE); | |
573 | fail: | |
574 | up_write(&F2FS_I(inode)->i_sem); | |
575 | return err; | |
576 | } | |
577 | ||
dbeacf02 CY |
578 | void f2fs_drop_nlink(struct inode *dir, struct inode *inode, struct page *page) |
579 | { | |
580 | struct f2fs_sb_info *sbi = F2FS_I_SB(dir); | |
581 | ||
582 | down_write(&F2FS_I(inode)->i_sem); | |
583 | ||
584 | if (S_ISDIR(inode->i_mode)) { | |
585 | drop_nlink(dir); | |
586 | if (page) | |
587 | update_inode(dir, page); | |
588 | else | |
589 | update_inode_page(dir); | |
590 | } | |
591 | inode->i_ctime = CURRENT_TIME; | |
592 | ||
593 | drop_nlink(inode); | |
594 | if (S_ISDIR(inode->i_mode)) { | |
595 | drop_nlink(inode); | |
596 | i_size_write(inode, 0); | |
597 | } | |
598 | up_write(&F2FS_I(inode)->i_sem); | |
599 | update_inode_page(inode); | |
600 | ||
601 | if (inode->i_nlink == 0) | |
602 | add_orphan_inode(sbi, inode->i_ino); | |
603 | else | |
604 | release_orphan_inode(sbi); | |
605 | } | |
606 | ||
0a8165d7 | 607 | /* |
e1c42045 | 608 | * It only removes the dentry from the dentry page, corresponding name |
6b4ea016 JK |
609 | * entry in name page does not need to be touched during deletion. |
610 | */ | |
611 | void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page, | |
dbeacf02 | 612 | struct inode *dir, struct inode *inode) |
6b4ea016 JK |
613 | { |
614 | struct f2fs_dentry_block *dentry_blk; | |
615 | unsigned int bit_pos; | |
457d08ee | 616 | int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len)); |
6b4ea016 JK |
617 | int i; |
618 | ||
622f28ae CY |
619 | if (f2fs_has_inline_dentry(dir)) |
620 | return f2fs_delete_inline_entry(dentry, page, dir, inode); | |
621 | ||
6b4ea016 | 622 | lock_page(page); |
3cb5ad15 | 623 | f2fs_wait_on_page_writeback(page, DATA); |
6b4ea016 | 624 | |
1c3bb978 GZ |
625 | dentry_blk = page_address(page); |
626 | bit_pos = dentry - dentry_blk->dentry; | |
6b4ea016 JK |
627 | for (i = 0; i < slots; i++) |
628 | test_and_clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap); | |
629 | ||
630 | /* Let's check and deallocate this dentry page */ | |
631 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
632 | NR_DENTRY_IN_BLOCK, | |
633 | 0); | |
634 | kunmap(page); /* kunmap - pair of f2fs_find_entry */ | |
635 | set_page_dirty(page); | |
636 | ||
637 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; | |
638 | ||
dbeacf02 CY |
639 | if (inode) |
640 | f2fs_drop_nlink(dir, inode, NULL); | |
6b4ea016 JK |
641 | |
642 | if (bit_pos == NR_DENTRY_IN_BLOCK) { | |
6b4ea016 JK |
643 | truncate_hole(dir, page->index, page->index + 1); |
644 | clear_page_dirty_for_io(page); | |
645 | ClearPageUptodate(page); | |
a7ffdbe2 | 646 | inode_dec_dirty_pages(dir); |
6b4ea016 | 647 | } |
508198be | 648 | f2fs_put_page(page, 1); |
6b4ea016 JK |
649 | } |
650 | ||
651 | bool f2fs_empty_dir(struct inode *dir) | |
652 | { | |
653 | unsigned long bidx; | |
654 | struct page *dentry_page; | |
655 | unsigned int bit_pos; | |
dbeacf02 | 656 | struct f2fs_dentry_block *dentry_blk; |
6b4ea016 JK |
657 | unsigned long nblock = dir_blocks(dir); |
658 | ||
622f28ae CY |
659 | if (f2fs_has_inline_dentry(dir)) |
660 | return f2fs_empty_inline_dir(dir); | |
661 | ||
6b4ea016 | 662 | for (bidx = 0; bidx < nblock; bidx++) { |
6b4ea016 JK |
663 | dentry_page = get_lock_data_page(dir, bidx); |
664 | if (IS_ERR(dentry_page)) { | |
665 | if (PTR_ERR(dentry_page) == -ENOENT) | |
666 | continue; | |
667 | else | |
668 | return false; | |
669 | } | |
670 | ||
1c3bb978 | 671 | dentry_blk = kmap_atomic(dentry_page); |
6b4ea016 JK |
672 | if (bidx == 0) |
673 | bit_pos = 2; | |
674 | else | |
675 | bit_pos = 0; | |
676 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
677 | NR_DENTRY_IN_BLOCK, | |
678 | bit_pos); | |
1c3bb978 | 679 | kunmap_atomic(dentry_blk); |
6b4ea016 JK |
680 | |
681 | f2fs_put_page(dentry_page, 1); | |
682 | ||
683 | if (bit_pos < NR_DENTRY_IN_BLOCK) | |
684 | return false; | |
685 | } | |
686 | return true; | |
687 | } | |
688 | ||
6f7f231e | 689 | static int f2fs_readdir(struct file *file, struct dir_context *ctx) |
6b4ea016 | 690 | { |
496ad9aa | 691 | struct inode *inode = file_inode(file); |
6b4ea016 | 692 | unsigned long npages = dir_blocks(inode); |
99b072bb | 693 | unsigned int bit_pos = 0; |
6b4ea016 JK |
694 | struct f2fs_dentry_block *dentry_blk = NULL; |
695 | struct f2fs_dir_entry *de = NULL; | |
696 | struct page *dentry_page = NULL; | |
817202d9 | 697 | struct file_ra_state *ra = &file->f_ra; |
6f7f231e | 698 | unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK); |
6b4ea016 | 699 | unsigned char d_type = DT_UNKNOWN; |
6b4ea016 | 700 | |
622f28ae CY |
701 | if (f2fs_has_inline_dentry(inode)) |
702 | return f2fs_read_inline_dir(file, ctx); | |
703 | ||
6f7f231e | 704 | bit_pos = ((unsigned long)ctx->pos % NR_DENTRY_IN_BLOCK); |
6b4ea016 | 705 | |
817202d9 CY |
706 | /* readahead for multi pages of dir */ |
707 | if (npages - n > 1 && !ra_has_index(ra, n)) | |
708 | page_cache_sync_readahead(inode->i_mapping, ra, file, n, | |
709 | min(npages - n, (pgoff_t)MAX_DIR_RA_PAGES)); | |
710 | ||
6c311ec6 | 711 | for (; n < npages; n++) { |
6b4ea016 JK |
712 | dentry_page = get_lock_data_page(inode, n); |
713 | if (IS_ERR(dentry_page)) | |
714 | continue; | |
715 | ||
6b4ea016 JK |
716 | dentry_blk = kmap(dentry_page); |
717 | while (bit_pos < NR_DENTRY_IN_BLOCK) { | |
6b4ea016 JK |
718 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, |
719 | NR_DENTRY_IN_BLOCK, | |
720 | bit_pos); | |
721 | if (bit_pos >= NR_DENTRY_IN_BLOCK) | |
722 | break; | |
723 | ||
724 | de = &dentry_blk->dentry[bit_pos]; | |
6f7f231e AV |
725 | if (de->file_type < F2FS_FT_MAX) |
726 | d_type = f2fs_filetype_table[de->file_type]; | |
727 | else | |
728 | d_type = DT_UNKNOWN; | |
729 | if (!dir_emit(ctx, | |
99b072bb JK |
730 | dentry_blk->filename[bit_pos], |
731 | le16_to_cpu(de->name_len), | |
732 | le32_to_cpu(de->ino), d_type)) | |
733 | goto stop; | |
734 | ||
735 | bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len)); | |
736 | ctx->pos = n * NR_DENTRY_IN_BLOCK + bit_pos; | |
6b4ea016 JK |
737 | } |
738 | bit_pos = 0; | |
6f7f231e | 739 | ctx->pos = (n + 1) * NR_DENTRY_IN_BLOCK; |
6b4ea016 JK |
740 | kunmap(dentry_page); |
741 | f2fs_put_page(dentry_page, 1); | |
742 | dentry_page = NULL; | |
743 | } | |
99b072bb | 744 | stop: |
6b4ea016 JK |
745 | if (dentry_page && !IS_ERR(dentry_page)) { |
746 | kunmap(dentry_page); | |
747 | f2fs_put_page(dentry_page, 1); | |
748 | } | |
749 | ||
750 | return 0; | |
751 | } | |
752 | ||
753 | const struct file_operations f2fs_dir_operations = { | |
754 | .llseek = generic_file_llseek, | |
755 | .read = generic_read_dir, | |
6f7f231e | 756 | .iterate = f2fs_readdir, |
6b4ea016 JK |
757 | .fsync = f2fs_sync_file, |
758 | .unlocked_ioctl = f2fs_ioctl, | |
759 | }; |