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 | ||
4e6ebf6d | 80 | static 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, | |
4e6ebf6d JK |
93 | struct qstr *name, int *max_slots, |
94 | struct page **res_page) | |
95 | { | |
96 | struct f2fs_dentry_block *dentry_blk; | |
97 | struct f2fs_dir_entry *de; | |
98 | ||
99 | *max_slots = NR_DENTRY_IN_BLOCK; | |
100 | ||
101 | dentry_blk = (struct f2fs_dentry_block *)kmap(dentry_page); | |
102 | de = find_target_dentry(name, max_slots, &dentry_blk->dentry_bitmap, | |
103 | dentry_blk->dentry, | |
104 | dentry_blk->filename); | |
105 | if (de) | |
106 | *res_page = dentry_page; | |
107 | else | |
108 | kunmap(dentry_page); | |
109 | ||
110 | /* | |
111 | * For the most part, it should be a bug when name_len is zero. | |
112 | * We stop here for figuring out where the bugs has occurred. | |
113 | */ | |
114 | f2fs_bug_on(F2FS_P_SB(dentry_page), *max_slots < 0); | |
115 | return de; | |
116 | } | |
117 | ||
118 | struct f2fs_dir_entry *find_target_dentry(struct qstr *name, int *max_slots, | |
119 | const void *bitmap, struct f2fs_dir_entry *dentry, | |
120 | __u8 (*filenames)[F2FS_SLOT_LEN]) | |
6b4ea016 JK |
121 | { |
122 | struct f2fs_dir_entry *de; | |
5d0c6671 | 123 | unsigned long bit_pos = 0; |
4e6ebf6d JK |
124 | f2fs_hash_t namehash = f2fs_dentry_hash(name); |
125 | int max_bits = *max_slots; | |
5d0c6671 | 126 | int max_len = 0; |
6b4ea016 | 127 | |
4e6ebf6d JK |
128 | *max_slots = 0; |
129 | while (bit_pos < max_bits) { | |
130 | if (!test_bit_le(bit_pos, bitmap)) { | |
5d0c6671 JK |
131 | if (bit_pos == 0) |
132 | max_len = 1; | |
4e6ebf6d | 133 | else if (!test_bit_le(bit_pos - 1, bitmap)) |
5d0c6671 JK |
134 | max_len++; |
135 | bit_pos++; | |
136 | continue; | |
137 | } | |
4e6ebf6d JK |
138 | de = &dentry[bit_pos]; |
139 | if (early_match_name(name->len, namehash, de) && | |
140 | !memcmp(filenames[bit_pos], name->name, name->len)) | |
141 | goto found; | |
142 | ||
143 | if (*max_slots >= 0 && max_len > *max_slots) { | |
5d0c6671 JK |
144 | *max_slots = max_len; |
145 | max_len = 0; | |
146 | } | |
81e366f8 | 147 | |
4e6ebf6d JK |
148 | /* remain bug on condition */ |
149 | if (unlikely(!de->name_len)) | |
150 | *max_slots = -1; | |
81e366f8 | 151 | |
5d0c6671 | 152 | bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len)); |
6b4ea016 JK |
153 | } |
154 | ||
155 | de = NULL; | |
6b4ea016 | 156 | found: |
5d0c6671 JK |
157 | if (max_len > *max_slots) |
158 | *max_slots = max_len; | |
6b4ea016 JK |
159 | return de; |
160 | } | |
161 | ||
162 | static struct f2fs_dir_entry *find_in_level(struct inode *dir, | |
eee6160f | 163 | unsigned int level, struct qstr *name, |
6b4ea016 JK |
164 | f2fs_hash_t namehash, struct page **res_page) |
165 | { | |
eee6160f | 166 | int s = GET_DENTRY_SLOTS(name->len); |
6b4ea016 JK |
167 | unsigned int nbucket, nblock; |
168 | unsigned int bidx, end_block; | |
169 | struct page *dentry_page; | |
170 | struct f2fs_dir_entry *de = NULL; | |
171 | bool room = false; | |
4e6ebf6d | 172 | int max_slots; |
6b4ea016 | 173 | |
9850cf4a | 174 | f2fs_bug_on(F2FS_I_SB(dir), level > MAX_DIR_HASH_DEPTH); |
6b4ea016 | 175 | |
38431545 | 176 | nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level); |
6b4ea016 JK |
177 | nblock = bucket_blocks(level); |
178 | ||
38431545 JK |
179 | bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level, |
180 | le32_to_cpu(namehash) % nbucket); | |
6b4ea016 JK |
181 | end_block = bidx + nblock; |
182 | ||
183 | for (; bidx < end_block; bidx++) { | |
184 | /* no need to allocate new dentry pages to all the indices */ | |
c718379b | 185 | dentry_page = find_data_page(dir, bidx, true); |
6b4ea016 JK |
186 | if (IS_ERR(dentry_page)) { |
187 | room = true; | |
188 | continue; | |
189 | } | |
190 | ||
4e6ebf6d | 191 | de = find_in_block(dentry_page, name, &max_slots, res_page); |
6b4ea016 JK |
192 | if (de) |
193 | break; | |
194 | ||
195 | if (max_slots >= s) | |
196 | room = true; | |
197 | f2fs_put_page(dentry_page, 0); | |
198 | } | |
199 | ||
200 | if (!de && room && F2FS_I(dir)->chash != namehash) { | |
201 | F2FS_I(dir)->chash = namehash; | |
202 | F2FS_I(dir)->clevel = level; | |
203 | } | |
204 | ||
205 | return de; | |
206 | } | |
207 | ||
208 | /* | |
209 | * Find an entry in the specified directory with the wanted name. | |
210 | * It returns the page where the entry was found (as a parameter - res_page), | |
211 | * and the entry itself. Page is returned mapped and unlocked. | |
212 | * Entry is guaranteed to be valid. | |
213 | */ | |
214 | struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir, | |
215 | struct qstr *child, struct page **res_page) | |
216 | { | |
6b4ea016 JK |
217 | unsigned long npages = dir_blocks(dir); |
218 | struct f2fs_dir_entry *de = NULL; | |
219 | f2fs_hash_t name_hash; | |
220 | unsigned int max_depth; | |
221 | unsigned int level; | |
222 | ||
622f28ae CY |
223 | if (f2fs_has_inline_dentry(dir)) |
224 | return find_in_inline_dir(dir, child, res_page); | |
225 | ||
6b4ea016 JK |
226 | if (npages == 0) |
227 | return NULL; | |
228 | ||
229 | *res_page = NULL; | |
230 | ||
eee6160f | 231 | name_hash = f2fs_dentry_hash(child); |
6b4ea016 JK |
232 | max_depth = F2FS_I(dir)->i_current_depth; |
233 | ||
234 | for (level = 0; level < max_depth; level++) { | |
eee6160f | 235 | de = find_in_level(dir, level, child, name_hash, res_page); |
6b4ea016 JK |
236 | if (de) |
237 | break; | |
238 | } | |
239 | if (!de && F2FS_I(dir)->chash != name_hash) { | |
240 | F2FS_I(dir)->chash = name_hash; | |
241 | F2FS_I(dir)->clevel = level - 1; | |
242 | } | |
243 | return de; | |
244 | } | |
245 | ||
246 | struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p) | |
247 | { | |
4777f86b NJ |
248 | struct page *page; |
249 | struct f2fs_dir_entry *de; | |
250 | struct f2fs_dentry_block *dentry_blk; | |
6b4ea016 | 251 | |
622f28ae CY |
252 | if (f2fs_has_inline_dentry(dir)) |
253 | return f2fs_parent_inline_dir(dir, p); | |
254 | ||
6b4ea016 JK |
255 | page = get_lock_data_page(dir, 0); |
256 | if (IS_ERR(page)) | |
257 | return NULL; | |
258 | ||
259 | dentry_blk = kmap(page); | |
260 | de = &dentry_blk->dentry[1]; | |
261 | *p = page; | |
262 | unlock_page(page); | |
263 | return de; | |
264 | } | |
265 | ||
266 | ino_t f2fs_inode_by_name(struct inode *dir, struct qstr *qstr) | |
267 | { | |
268 | ino_t res = 0; | |
269 | struct f2fs_dir_entry *de; | |
270 | struct page *page; | |
271 | ||
272 | de = f2fs_find_entry(dir, qstr, &page); | |
273 | if (de) { | |
274 | res = le32_to_cpu(de->ino); | |
622f28ae CY |
275 | if (!f2fs_has_inline_dentry(dir)) |
276 | kunmap(page); | |
6b4ea016 JK |
277 | f2fs_put_page(page, 0); |
278 | } | |
279 | ||
280 | return res; | |
281 | } | |
282 | ||
283 | void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de, | |
284 | struct page *page, struct inode *inode) | |
285 | { | |
59a06155 | 286 | enum page_type type = f2fs_has_inline_dentry(dir) ? NODE : DATA; |
6b4ea016 | 287 | lock_page(page); |
59a06155 | 288 | f2fs_wait_on_page_writeback(page, type); |
6b4ea016 JK |
289 | de->ino = cpu_to_le32(inode->i_ino); |
290 | set_de_type(de, inode); | |
622f28ae CY |
291 | if (!f2fs_has_inline_dentry(dir)) |
292 | kunmap(page); | |
6b4ea016 JK |
293 | set_page_dirty(page); |
294 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; | |
295 | mark_inode_dirty(dir); | |
6666e6aa | 296 | |
6b4ea016 | 297 | f2fs_put_page(page, 1); |
6b4ea016 JK |
298 | } |
299 | ||
44a83ff6 | 300 | static void init_dent_inode(const struct qstr *name, struct page *ipage) |
6b4ea016 | 301 | { |
58bfaf44 | 302 | struct f2fs_inode *ri; |
6b4ea016 | 303 | |
54b591df JK |
304 | f2fs_wait_on_page_writeback(ipage, NODE); |
305 | ||
53dc9a67 | 306 | /* copy name info. to this inode page */ |
58bfaf44 JK |
307 | ri = F2FS_INODE(ipage); |
308 | ri->i_namelen = cpu_to_le32(name->len); | |
309 | memcpy(ri->i_name, name->name, name->len); | |
6b4ea016 JK |
310 | set_page_dirty(ipage); |
311 | } | |
312 | ||
1cd14caf JK |
313 | int update_dent_inode(struct inode *inode, const struct qstr *name) |
314 | { | |
1cd14caf JK |
315 | struct page *page; |
316 | ||
4081363f | 317 | page = get_node_page(F2FS_I_SB(inode), inode->i_ino); |
1cd14caf JK |
318 | if (IS_ERR(page)) |
319 | return PTR_ERR(page); | |
320 | ||
321 | init_dent_inode(name, page); | |
322 | f2fs_put_page(page, 1); | |
323 | ||
324 | return 0; | |
325 | } | |
326 | ||
44a83ff6 JK |
327 | static int make_empty_dir(struct inode *inode, |
328 | struct inode *parent, struct page *page) | |
39936837 JK |
329 | { |
330 | struct page *dentry_page; | |
331 | struct f2fs_dentry_block *dentry_blk; | |
332 | struct f2fs_dir_entry *de; | |
39936837 | 333 | |
622f28ae CY |
334 | if (f2fs_has_inline_dentry(inode)) |
335 | return make_empty_inline_dir(inode, parent, page); | |
336 | ||
44a83ff6 | 337 | dentry_page = get_new_data_page(inode, page, 0, true); |
39936837 JK |
338 | if (IS_ERR(dentry_page)) |
339 | return PTR_ERR(dentry_page); | |
340 | ||
1c3bb978 | 341 | dentry_blk = kmap_atomic(dentry_page); |
39936837 JK |
342 | |
343 | de = &dentry_blk->dentry[0]; | |
344 | de->name_len = cpu_to_le16(1); | |
345 | de->hash_code = 0; | |
346 | de->ino = cpu_to_le32(inode->i_ino); | |
347 | memcpy(dentry_blk->filename[0], ".", 1); | |
348 | set_de_type(de, inode); | |
349 | ||
350 | de = &dentry_blk->dentry[1]; | |
351 | de->hash_code = 0; | |
352 | de->name_len = cpu_to_le16(2); | |
353 | de->ino = cpu_to_le32(parent->i_ino); | |
354 | memcpy(dentry_blk->filename[1], "..", 2); | |
355 | set_de_type(de, inode); | |
356 | ||
357 | test_and_set_bit_le(0, &dentry_blk->dentry_bitmap); | |
358 | test_and_set_bit_le(1, &dentry_blk->dentry_bitmap); | |
1c3bb978 | 359 | kunmap_atomic(dentry_blk); |
39936837 JK |
360 | |
361 | set_page_dirty(dentry_page); | |
362 | f2fs_put_page(dentry_page, 1); | |
363 | return 0; | |
364 | } | |
365 | ||
bce8d112 JK |
366 | struct page *init_inode_metadata(struct inode *inode, struct inode *dir, |
367 | const struct qstr *name, struct page *dpage) | |
6b4ea016 | 368 | { |
44a83ff6 JK |
369 | struct page *page; |
370 | int err; | |
371 | ||
b97a9b5d | 372 | if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) { |
a014e037 | 373 | page = new_inode_page(inode); |
44a83ff6 JK |
374 | if (IS_ERR(page)) |
375 | return page; | |
6b4ea016 JK |
376 | |
377 | if (S_ISDIR(inode->i_mode)) { | |
44a83ff6 JK |
378 | err = make_empty_dir(inode, dir, page); |
379 | if (err) | |
380 | goto error; | |
6b4ea016 JK |
381 | } |
382 | ||
bce8d112 | 383 | err = f2fs_init_acl(inode, dir, page, dpage); |
44a83ff6 | 384 | if (err) |
a8865372 | 385 | goto put_error; |
44a83ff6 | 386 | |
8ae8f162 JK |
387 | err = f2fs_init_security(inode, dir, name, page); |
388 | if (err) | |
a8865372 | 389 | goto put_error; |
6b4ea016 | 390 | } else { |
4081363f | 391 | page = get_node_page(F2FS_I_SB(dir), inode->i_ino); |
44a83ff6 JK |
392 | if (IS_ERR(page)) |
393 | return page; | |
394 | ||
44a83ff6 | 395 | set_cold_node(inode, page); |
6b4ea016 | 396 | } |
44a83ff6 | 397 | |
b97a9b5d JK |
398 | if (name) |
399 | init_dent_inode(name, page); | |
44a83ff6 | 400 | |
83d5d6f6 JK |
401 | /* |
402 | * This file should be checkpointed during fsync. | |
403 | * We lost i_pino from now on. | |
404 | */ | |
6b4ea016 | 405 | if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) { |
354a3399 | 406 | file_lost_pino(inode); |
50732df0 CY |
407 | /* |
408 | * If link the tmpfile to alias through linkat path, | |
409 | * we should remove this inode from orphan list. | |
410 | */ | |
411 | if (inode->i_nlink == 0) | |
4081363f | 412 | remove_orphan_inode(F2FS_I_SB(dir), inode->i_ino); |
6b4ea016 | 413 | inc_nlink(inode); |
6b4ea016 | 414 | } |
44a83ff6 JK |
415 | return page; |
416 | ||
a8865372 | 417 | put_error: |
44a83ff6 | 418 | f2fs_put_page(page, 1); |
90d72459 | 419 | error: |
bd859c65 JK |
420 | /* once the failed inode becomes a bad inode, i_mode is S_IFREG */ |
421 | truncate_inode_pages(&inode->i_data, 0); | |
764aa3e9 | 422 | truncate_blocks(inode, 0, false); |
bd859c65 | 423 | remove_dirty_dir_inode(inode); |
44a83ff6 JK |
424 | remove_inode_page(inode); |
425 | return ERR_PTR(err); | |
6b4ea016 JK |
426 | } |
427 | ||
dbeacf02 | 428 | void update_parent_metadata(struct inode *dir, struct inode *inode, |
6b4ea016 JK |
429 | unsigned int current_depth) |
430 | { | |
6b4ea016 JK |
431 | if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) { |
432 | if (S_ISDIR(inode->i_mode)) { | |
433 | inc_nlink(dir); | |
699489bb | 434 | set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR); |
6b4ea016 JK |
435 | } |
436 | clear_inode_flag(F2FS_I(inode), FI_NEW_INODE); | |
437 | } | |
438 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; | |
a18ff063 JK |
439 | mark_inode_dirty(dir); |
440 | ||
6b4ea016 JK |
441 | if (F2FS_I(dir)->i_current_depth != current_depth) { |
442 | F2FS_I(dir)->i_current_depth = current_depth; | |
699489bb | 443 | set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR); |
6b4ea016 JK |
444 | } |
445 | ||
6b4ea016 JK |
446 | if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) |
447 | clear_inode_flag(F2FS_I(inode), FI_INC_LINK); | |
448 | } | |
449 | ||
a82afa20 | 450 | int room_for_filename(const void *bitmap, int slots, int max_slots) |
6b4ea016 JK |
451 | { |
452 | int bit_start = 0; | |
453 | int zero_start, zero_end; | |
454 | next: | |
a82afa20 JK |
455 | zero_start = find_next_zero_bit_le(bitmap, max_slots, bit_start); |
456 | if (zero_start >= max_slots) | |
457 | return max_slots; | |
458 | ||
459 | zero_end = find_next_bit_le(bitmap, max_slots, zero_start); | |
6b4ea016 JK |
460 | if (zero_end - zero_start >= slots) |
461 | return zero_start; | |
462 | ||
463 | bit_start = zero_end + 1; | |
464 | ||
a82afa20 JK |
465 | if (zero_end + 1 >= max_slots) |
466 | return max_slots; | |
6b4ea016 JK |
467 | goto next; |
468 | } | |
469 | ||
39936837 | 470 | /* |
4f4124d0 CY |
471 | * Caller should grab and release a rwsem by calling f2fs_lock_op() and |
472 | * f2fs_unlock_op(). | |
39936837 | 473 | */ |
6c311ec6 CF |
474 | int __f2fs_add_link(struct inode *dir, const struct qstr *name, |
475 | struct inode *inode) | |
6b4ea016 JK |
476 | { |
477 | unsigned int bit_pos; | |
478 | unsigned int level; | |
479 | unsigned int current_depth; | |
480 | unsigned long bidx, block; | |
481 | f2fs_hash_t dentry_hash; | |
482 | struct f2fs_dir_entry *de; | |
483 | unsigned int nbucket, nblock; | |
b7f7a5e0 | 484 | size_t namelen = name->len; |
6b4ea016 JK |
485 | struct page *dentry_page = NULL; |
486 | struct f2fs_dentry_block *dentry_blk = NULL; | |
457d08ee | 487 | int slots = GET_DENTRY_SLOTS(namelen); |
44a83ff6 | 488 | struct page *page; |
6b4ea016 JK |
489 | int err = 0; |
490 | int i; | |
491 | ||
622f28ae CY |
492 | if (f2fs_has_inline_dentry(dir)) { |
493 | err = f2fs_add_inline_entry(dir, name, inode); | |
494 | if (!err || err != -EAGAIN) | |
495 | return err; | |
496 | else | |
497 | err = 0; | |
498 | } | |
499 | ||
eee6160f | 500 | dentry_hash = f2fs_dentry_hash(name); |
6b4ea016 JK |
501 | level = 0; |
502 | current_depth = F2FS_I(dir)->i_current_depth; | |
503 | if (F2FS_I(dir)->chash == dentry_hash) { | |
504 | level = F2FS_I(dir)->clevel; | |
505 | F2FS_I(dir)->chash = 0; | |
506 | } | |
507 | ||
508 | start: | |
cfb271d4 | 509 | if (unlikely(current_depth == MAX_DIR_HASH_DEPTH)) |
6b4ea016 JK |
510 | return -ENOSPC; |
511 | ||
512 | /* Increase the depth, if required */ | |
513 | if (level == current_depth) | |
514 | ++current_depth; | |
515 | ||
38431545 | 516 | nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level); |
6b4ea016 JK |
517 | nblock = bucket_blocks(level); |
518 | ||
38431545 JK |
519 | bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level, |
520 | (le32_to_cpu(dentry_hash) % nbucket)); | |
6b4ea016 JK |
521 | |
522 | for (block = bidx; block <= (bidx + nblock - 1); block++) { | |
64aa7ed9 | 523 | dentry_page = get_new_data_page(dir, NULL, block, true); |
39936837 | 524 | if (IS_ERR(dentry_page)) |
6b4ea016 | 525 | return PTR_ERR(dentry_page); |
6b4ea016 JK |
526 | |
527 | dentry_blk = kmap(dentry_page); | |
a82afa20 JK |
528 | bit_pos = room_for_filename(&dentry_blk->dentry_bitmap, |
529 | slots, NR_DENTRY_IN_BLOCK); | |
6b4ea016 JK |
530 | if (bit_pos < NR_DENTRY_IN_BLOCK) |
531 | goto add_dentry; | |
532 | ||
533 | kunmap(dentry_page); | |
534 | f2fs_put_page(dentry_page, 1); | |
6b4ea016 JK |
535 | } |
536 | ||
537 | /* Move to next level to find the empty slot for new dentry */ | |
538 | ++level; | |
539 | goto start; | |
540 | add_dentry: | |
3cb5ad15 | 541 | f2fs_wait_on_page_writeback(dentry_page, DATA); |
6b4ea016 | 542 | |
d928bfbf | 543 | down_write(&F2FS_I(inode)->i_sem); |
bce8d112 | 544 | page = init_inode_metadata(inode, dir, name, NULL); |
44a83ff6 JK |
545 | if (IS_ERR(page)) { |
546 | err = PTR_ERR(page); | |
547 | goto fail; | |
548 | } | |
6b4ea016 | 549 | de = &dentry_blk->dentry[bit_pos]; |
25ca923b | 550 | de->hash_code = dentry_hash; |
6b4ea016 | 551 | de->name_len = cpu_to_le16(namelen); |
b7f7a5e0 | 552 | memcpy(dentry_blk->filename[bit_pos], name->name, name->len); |
6b4ea016 JK |
553 | de->ino = cpu_to_le32(inode->i_ino); |
554 | set_de_type(de, inode); | |
555 | for (i = 0; i < slots; i++) | |
556 | test_and_set_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap); | |
557 | set_page_dirty(dentry_page); | |
6666e6aa | 558 | |
44a83ff6 | 559 | /* we don't need to mark_inode_dirty now */ |
6666e6aa | 560 | F2FS_I(inode)->i_pino = dir->i_ino; |
44a83ff6 JK |
561 | update_inode(inode, page); |
562 | f2fs_put_page(page, 1); | |
563 | ||
564 | update_parent_metadata(dir, inode, current_depth); | |
6b4ea016 | 565 | fail: |
d928bfbf JK |
566 | up_write(&F2FS_I(inode)->i_sem); |
567 | ||
924a2ddb JK |
568 | if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR)) { |
569 | update_inode_page(dir); | |
570 | clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR); | |
571 | } | |
6b4ea016 JK |
572 | kunmap(dentry_page); |
573 | f2fs_put_page(dentry_page, 1); | |
6b4ea016 JK |
574 | return err; |
575 | } | |
576 | ||
b97a9b5d JK |
577 | int f2fs_do_tmpfile(struct inode *inode, struct inode *dir) |
578 | { | |
579 | struct page *page; | |
580 | int err = 0; | |
581 | ||
582 | down_write(&F2FS_I(inode)->i_sem); | |
bce8d112 | 583 | page = init_inode_metadata(inode, dir, NULL, NULL); |
b97a9b5d JK |
584 | if (IS_ERR(page)) { |
585 | err = PTR_ERR(page); | |
586 | goto fail; | |
587 | } | |
588 | /* we don't need to mark_inode_dirty now */ | |
589 | update_inode(inode, page); | |
590 | f2fs_put_page(page, 1); | |
591 | ||
592 | clear_inode_flag(F2FS_I(inode), FI_NEW_INODE); | |
593 | fail: | |
594 | up_write(&F2FS_I(inode)->i_sem); | |
595 | return err; | |
596 | } | |
597 | ||
dbeacf02 CY |
598 | void f2fs_drop_nlink(struct inode *dir, struct inode *inode, struct page *page) |
599 | { | |
600 | struct f2fs_sb_info *sbi = F2FS_I_SB(dir); | |
601 | ||
602 | down_write(&F2FS_I(inode)->i_sem); | |
603 | ||
604 | if (S_ISDIR(inode->i_mode)) { | |
605 | drop_nlink(dir); | |
606 | if (page) | |
607 | update_inode(dir, page); | |
608 | else | |
609 | update_inode_page(dir); | |
610 | } | |
611 | inode->i_ctime = CURRENT_TIME; | |
612 | ||
613 | drop_nlink(inode); | |
614 | if (S_ISDIR(inode->i_mode)) { | |
615 | drop_nlink(inode); | |
616 | i_size_write(inode, 0); | |
617 | } | |
618 | up_write(&F2FS_I(inode)->i_sem); | |
619 | update_inode_page(inode); | |
620 | ||
621 | if (inode->i_nlink == 0) | |
622 | add_orphan_inode(sbi, inode->i_ino); | |
623 | else | |
624 | release_orphan_inode(sbi); | |
625 | } | |
626 | ||
0a8165d7 | 627 | /* |
e1c42045 | 628 | * It only removes the dentry from the dentry page, corresponding name |
6b4ea016 JK |
629 | * entry in name page does not need to be touched during deletion. |
630 | */ | |
631 | void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page, | |
dbeacf02 | 632 | struct inode *dir, struct inode *inode) |
6b4ea016 JK |
633 | { |
634 | struct f2fs_dentry_block *dentry_blk; | |
635 | unsigned int bit_pos; | |
457d08ee | 636 | int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len)); |
6b4ea016 JK |
637 | int i; |
638 | ||
622f28ae CY |
639 | if (f2fs_has_inline_dentry(dir)) |
640 | return f2fs_delete_inline_entry(dentry, page, dir, inode); | |
641 | ||
6b4ea016 | 642 | lock_page(page); |
3cb5ad15 | 643 | f2fs_wait_on_page_writeback(page, DATA); |
6b4ea016 | 644 | |
1c3bb978 GZ |
645 | dentry_blk = page_address(page); |
646 | bit_pos = dentry - dentry_blk->dentry; | |
6b4ea016 JK |
647 | for (i = 0; i < slots; i++) |
648 | test_and_clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap); | |
649 | ||
650 | /* Let's check and deallocate this dentry page */ | |
651 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
652 | NR_DENTRY_IN_BLOCK, | |
653 | 0); | |
654 | kunmap(page); /* kunmap - pair of f2fs_find_entry */ | |
655 | set_page_dirty(page); | |
656 | ||
657 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; | |
658 | ||
dbeacf02 CY |
659 | if (inode) |
660 | f2fs_drop_nlink(dir, inode, NULL); | |
6b4ea016 JK |
661 | |
662 | if (bit_pos == NR_DENTRY_IN_BLOCK) { | |
6b4ea016 JK |
663 | truncate_hole(dir, page->index, page->index + 1); |
664 | clear_page_dirty_for_io(page); | |
665 | ClearPageUptodate(page); | |
a7ffdbe2 | 666 | inode_dec_dirty_pages(dir); |
6b4ea016 | 667 | } |
508198be | 668 | f2fs_put_page(page, 1); |
6b4ea016 JK |
669 | } |
670 | ||
671 | bool f2fs_empty_dir(struct inode *dir) | |
672 | { | |
673 | unsigned long bidx; | |
674 | struct page *dentry_page; | |
675 | unsigned int bit_pos; | |
dbeacf02 | 676 | struct f2fs_dentry_block *dentry_blk; |
6b4ea016 JK |
677 | unsigned long nblock = dir_blocks(dir); |
678 | ||
622f28ae CY |
679 | if (f2fs_has_inline_dentry(dir)) |
680 | return f2fs_empty_inline_dir(dir); | |
681 | ||
6b4ea016 | 682 | for (bidx = 0; bidx < nblock; bidx++) { |
6b4ea016 JK |
683 | dentry_page = get_lock_data_page(dir, bidx); |
684 | if (IS_ERR(dentry_page)) { | |
685 | if (PTR_ERR(dentry_page) == -ENOENT) | |
686 | continue; | |
687 | else | |
688 | return false; | |
689 | } | |
690 | ||
1c3bb978 | 691 | dentry_blk = kmap_atomic(dentry_page); |
6b4ea016 JK |
692 | if (bidx == 0) |
693 | bit_pos = 2; | |
694 | else | |
695 | bit_pos = 0; | |
696 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
697 | NR_DENTRY_IN_BLOCK, | |
698 | bit_pos); | |
1c3bb978 | 699 | kunmap_atomic(dentry_blk); |
6b4ea016 JK |
700 | |
701 | f2fs_put_page(dentry_page, 1); | |
702 | ||
703 | if (bit_pos < NR_DENTRY_IN_BLOCK) | |
704 | return false; | |
705 | } | |
706 | return true; | |
707 | } | |
708 | ||
38594de7 JK |
709 | bool f2fs_fill_dentries(struct dir_context *ctx, |
710 | const void *bitmap, struct f2fs_dir_entry *dentry, | |
711 | __u8 (*filenames)[F2FS_SLOT_LEN], int max, | |
712 | unsigned int start_pos) | |
713 | { | |
714 | unsigned char d_type = DT_UNKNOWN; | |
715 | unsigned int bit_pos; | |
716 | struct f2fs_dir_entry *de = NULL; | |
717 | ||
718 | bit_pos = ((unsigned long)ctx->pos % max); | |
719 | ||
720 | while (bit_pos < max) { | |
721 | bit_pos = find_next_bit_le(bitmap, max, bit_pos); | |
722 | if (bit_pos >= max) | |
723 | break; | |
724 | ||
725 | de = &dentry[bit_pos]; | |
726 | if (de->file_type < F2FS_FT_MAX) | |
727 | d_type = f2fs_filetype_table[de->file_type]; | |
728 | else | |
729 | d_type = DT_UNKNOWN; | |
730 | if (!dir_emit(ctx, filenames[bit_pos], | |
731 | le16_to_cpu(de->name_len), | |
732 | le32_to_cpu(de->ino), d_type)) | |
733 | return true; | |
734 | ||
735 | bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len)); | |
736 | ctx->pos = start_pos + bit_pos; | |
737 | } | |
738 | return false; | |
739 | } | |
740 | ||
6f7f231e | 741 | static int f2fs_readdir(struct file *file, struct dir_context *ctx) |
6b4ea016 | 742 | { |
496ad9aa | 743 | struct inode *inode = file_inode(file); |
6b4ea016 | 744 | unsigned long npages = dir_blocks(inode); |
6b4ea016 | 745 | struct f2fs_dentry_block *dentry_blk = NULL; |
6b4ea016 | 746 | struct page *dentry_page = NULL; |
817202d9 | 747 | struct file_ra_state *ra = &file->f_ra; |
6f7f231e | 748 | unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK); |
6b4ea016 | 749 | |
622f28ae CY |
750 | if (f2fs_has_inline_dentry(inode)) |
751 | return f2fs_read_inline_dir(file, ctx); | |
752 | ||
817202d9 CY |
753 | /* readahead for multi pages of dir */ |
754 | if (npages - n > 1 && !ra_has_index(ra, n)) | |
755 | page_cache_sync_readahead(inode->i_mapping, ra, file, n, | |
756 | min(npages - n, (pgoff_t)MAX_DIR_RA_PAGES)); | |
757 | ||
6c311ec6 | 758 | for (; n < npages; n++) { |
6b4ea016 JK |
759 | dentry_page = get_lock_data_page(inode, n); |
760 | if (IS_ERR(dentry_page)) | |
761 | continue; | |
762 | ||
6b4ea016 | 763 | dentry_blk = kmap(dentry_page); |
99b072bb | 764 | |
38594de7 JK |
765 | if (f2fs_fill_dentries(ctx, |
766 | &dentry_blk->dentry_bitmap, dentry_blk->dentry, | |
767 | dentry_blk->filename, | |
768 | NR_DENTRY_IN_BLOCK, n * NR_DENTRY_IN_BLOCK)) | |
769 | goto stop; | |
770 | ||
6f7f231e | 771 | ctx->pos = (n + 1) * NR_DENTRY_IN_BLOCK; |
6b4ea016 JK |
772 | kunmap(dentry_page); |
773 | f2fs_put_page(dentry_page, 1); | |
774 | dentry_page = NULL; | |
775 | } | |
99b072bb | 776 | stop: |
6b4ea016 JK |
777 | if (dentry_page && !IS_ERR(dentry_page)) { |
778 | kunmap(dentry_page); | |
779 | f2fs_put_page(dentry_page, 1); | |
780 | } | |
781 | ||
782 | return 0; | |
783 | } | |
784 | ||
785 | const struct file_operations f2fs_dir_operations = { | |
786 | .llseek = generic_file_llseek, | |
787 | .read = generic_read_dir, | |
6f7f231e | 788 | .iterate = f2fs_readdir, |
6b4ea016 JK |
789 | .fsync = f2fs_sync_file, |
790 | .unlocked_ioctl = f2fs_ioctl, | |
791 | }; |