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; | |
7b3cd7d6 | 98 | struct f2fs_dentry_ptr d; |
4e6ebf6d JK |
99 | |
100 | dentry_blk = (struct f2fs_dentry_block *)kmap(dentry_page); | |
7b3cd7d6 JK |
101 | |
102 | make_dentry_ptr(&d, (void *)dentry_blk, 1); | |
103 | de = find_target_dentry(name, max_slots, &d); | |
104 | ||
4e6ebf6d JK |
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 | */ | |
7b3cd7d6 | 114 | f2fs_bug_on(F2FS_P_SB(dentry_page), d.max < 0); |
4e6ebf6d JK |
115 | return de; |
116 | } | |
117 | ||
118 | struct f2fs_dir_entry *find_target_dentry(struct qstr *name, int *max_slots, | |
7b3cd7d6 | 119 | struct f2fs_dentry_ptr *d) |
6b4ea016 JK |
120 | { |
121 | struct f2fs_dir_entry *de; | |
5d0c6671 | 122 | unsigned long bit_pos = 0; |
4e6ebf6d | 123 | f2fs_hash_t namehash = f2fs_dentry_hash(name); |
5d0c6671 | 124 | int max_len = 0; |
6b4ea016 | 125 | |
7b3cd7d6 JK |
126 | if (max_slots) |
127 | *max_slots = 0; | |
128 | while (bit_pos < d->max) { | |
129 | if (!test_bit_le(bit_pos, d->bitmap)) { | |
5d0c6671 | 130 | bit_pos++; |
bda19076 | 131 | max_len++; |
5d0c6671 JK |
132 | continue; |
133 | } | |
bda19076 | 134 | |
7b3cd7d6 | 135 | de = &d->dentry[bit_pos]; |
4e6ebf6d | 136 | if (early_match_name(name->len, namehash, de) && |
7b3cd7d6 | 137 | !memcmp(d->filename[bit_pos], name->name, name->len)) |
4e6ebf6d JK |
138 | goto found; |
139 | ||
bda19076 | 140 | if (max_slots && max_len > *max_slots) |
5d0c6671 | 141 | *max_slots = max_len; |
bda19076 | 142 | max_len = 0; |
81e366f8 | 143 | |
4e6ebf6d JK |
144 | /* remain bug on condition */ |
145 | if (unlikely(!de->name_len)) | |
7b3cd7d6 | 146 | d->max = -1; |
81e366f8 | 147 | |
5d0c6671 | 148 | bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len)); |
6b4ea016 JK |
149 | } |
150 | ||
151 | de = NULL; | |
6b4ea016 | 152 | found: |
7b3cd7d6 | 153 | if (max_slots && max_len > *max_slots) |
5d0c6671 | 154 | *max_slots = max_len; |
6b4ea016 JK |
155 | return de; |
156 | } | |
157 | ||
158 | static struct f2fs_dir_entry *find_in_level(struct inode *dir, | |
eee6160f | 159 | unsigned int level, struct qstr *name, |
6b4ea016 JK |
160 | f2fs_hash_t namehash, struct page **res_page) |
161 | { | |
eee6160f | 162 | int s = GET_DENTRY_SLOTS(name->len); |
6b4ea016 JK |
163 | unsigned int nbucket, nblock; |
164 | unsigned int bidx, end_block; | |
165 | struct page *dentry_page; | |
166 | struct f2fs_dir_entry *de = NULL; | |
167 | bool room = false; | |
4e6ebf6d | 168 | int max_slots; |
6b4ea016 | 169 | |
9850cf4a | 170 | f2fs_bug_on(F2FS_I_SB(dir), level > MAX_DIR_HASH_DEPTH); |
6b4ea016 | 171 | |
38431545 | 172 | nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level); |
6b4ea016 JK |
173 | nblock = bucket_blocks(level); |
174 | ||
38431545 JK |
175 | bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level, |
176 | le32_to_cpu(namehash) % nbucket); | |
6b4ea016 JK |
177 | end_block = bidx + nblock; |
178 | ||
179 | for (; bidx < end_block; bidx++) { | |
180 | /* no need to allocate new dentry pages to all the indices */ | |
c718379b | 181 | dentry_page = find_data_page(dir, bidx, true); |
6b4ea016 JK |
182 | if (IS_ERR(dentry_page)) { |
183 | room = true; | |
184 | continue; | |
185 | } | |
186 | ||
4e6ebf6d | 187 | de = find_in_block(dentry_page, name, &max_slots, res_page); |
6b4ea016 JK |
188 | if (de) |
189 | break; | |
190 | ||
191 | if (max_slots >= s) | |
192 | room = true; | |
193 | f2fs_put_page(dentry_page, 0); | |
194 | } | |
195 | ||
196 | if (!de && room && F2FS_I(dir)->chash != namehash) { | |
197 | F2FS_I(dir)->chash = namehash; | |
198 | F2FS_I(dir)->clevel = level; | |
199 | } | |
200 | ||
201 | return de; | |
202 | } | |
203 | ||
204 | /* | |
205 | * Find an entry in the specified directory with the wanted name. | |
206 | * It returns the page where the entry was found (as a parameter - res_page), | |
207 | * and the entry itself. Page is returned mapped and unlocked. | |
208 | * Entry is guaranteed to be valid. | |
209 | */ | |
210 | struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir, | |
211 | struct qstr *child, struct page **res_page) | |
212 | { | |
6b4ea016 JK |
213 | unsigned long npages = dir_blocks(dir); |
214 | struct f2fs_dir_entry *de = NULL; | |
215 | f2fs_hash_t name_hash; | |
216 | unsigned int max_depth; | |
217 | unsigned int level; | |
218 | ||
b1f73b79 YZ |
219 | *res_page = NULL; |
220 | ||
622f28ae CY |
221 | if (f2fs_has_inline_dentry(dir)) |
222 | return find_in_inline_dir(dir, child, res_page); | |
223 | ||
6b4ea016 JK |
224 | if (npages == 0) |
225 | return NULL; | |
226 | ||
eee6160f | 227 | name_hash = f2fs_dentry_hash(child); |
6b4ea016 JK |
228 | max_depth = F2FS_I(dir)->i_current_depth; |
229 | ||
230 | for (level = 0; level < max_depth; level++) { | |
eee6160f | 231 | de = find_in_level(dir, level, child, name_hash, res_page); |
6b4ea016 JK |
232 | if (de) |
233 | break; | |
234 | } | |
235 | if (!de && F2FS_I(dir)->chash != name_hash) { | |
236 | F2FS_I(dir)->chash = name_hash; | |
237 | F2FS_I(dir)->clevel = level - 1; | |
238 | } | |
239 | return de; | |
240 | } | |
241 | ||
242 | struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p) | |
243 | { | |
4777f86b NJ |
244 | struct page *page; |
245 | struct f2fs_dir_entry *de; | |
246 | struct f2fs_dentry_block *dentry_blk; | |
6b4ea016 | 247 | |
622f28ae CY |
248 | if (f2fs_has_inline_dentry(dir)) |
249 | return f2fs_parent_inline_dir(dir, p); | |
250 | ||
6b4ea016 JK |
251 | page = get_lock_data_page(dir, 0); |
252 | if (IS_ERR(page)) | |
253 | return NULL; | |
254 | ||
255 | dentry_blk = kmap(page); | |
256 | de = &dentry_blk->dentry[1]; | |
257 | *p = page; | |
258 | unlock_page(page); | |
259 | return de; | |
260 | } | |
261 | ||
262 | ino_t f2fs_inode_by_name(struct inode *dir, struct qstr *qstr) | |
263 | { | |
264 | ino_t res = 0; | |
265 | struct f2fs_dir_entry *de; | |
266 | struct page *page; | |
267 | ||
268 | de = f2fs_find_entry(dir, qstr, &page); | |
269 | if (de) { | |
270 | res = le32_to_cpu(de->ino); | |
9486ba44 | 271 | f2fs_dentry_kunmap(dir, page); |
6b4ea016 JK |
272 | f2fs_put_page(page, 0); |
273 | } | |
274 | ||
275 | return res; | |
276 | } | |
277 | ||
278 | void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de, | |
279 | struct page *page, struct inode *inode) | |
280 | { | |
59a06155 | 281 | enum page_type type = f2fs_has_inline_dentry(dir) ? NODE : DATA; |
6b4ea016 | 282 | lock_page(page); |
59a06155 | 283 | f2fs_wait_on_page_writeback(page, type); |
6b4ea016 JK |
284 | de->ino = cpu_to_le32(inode->i_ino); |
285 | set_de_type(de, inode); | |
5df1f1da | 286 | f2fs_dentry_kunmap(dir, page); |
6b4ea016 JK |
287 | set_page_dirty(page); |
288 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; | |
289 | mark_inode_dirty(dir); | |
6666e6aa | 290 | |
6b4ea016 | 291 | f2fs_put_page(page, 1); |
6b4ea016 JK |
292 | } |
293 | ||
44a83ff6 | 294 | static void init_dent_inode(const struct qstr *name, struct page *ipage) |
6b4ea016 | 295 | { |
58bfaf44 | 296 | struct f2fs_inode *ri; |
6b4ea016 | 297 | |
54b591df JK |
298 | f2fs_wait_on_page_writeback(ipage, NODE); |
299 | ||
53dc9a67 | 300 | /* copy name info. to this inode page */ |
58bfaf44 JK |
301 | ri = F2FS_INODE(ipage); |
302 | ri->i_namelen = cpu_to_le32(name->len); | |
303 | memcpy(ri->i_name, name->name, name->len); | |
6b4ea016 JK |
304 | set_page_dirty(ipage); |
305 | } | |
306 | ||
1cd14caf JK |
307 | int update_dent_inode(struct inode *inode, const struct qstr *name) |
308 | { | |
1cd14caf JK |
309 | struct page *page; |
310 | ||
4081363f | 311 | page = get_node_page(F2FS_I_SB(inode), inode->i_ino); |
1cd14caf JK |
312 | if (IS_ERR(page)) |
313 | return PTR_ERR(page); | |
314 | ||
315 | init_dent_inode(name, page); | |
316 | f2fs_put_page(page, 1); | |
317 | ||
318 | return 0; | |
319 | } | |
320 | ||
062a3e7b JK |
321 | void do_make_empty_dir(struct inode *inode, struct inode *parent, |
322 | struct f2fs_dentry_ptr *d) | |
323 | { | |
324 | struct f2fs_dir_entry *de; | |
325 | ||
326 | de = &d->dentry[0]; | |
327 | de->name_len = cpu_to_le16(1); | |
328 | de->hash_code = 0; | |
329 | de->ino = cpu_to_le32(inode->i_ino); | |
330 | memcpy(d->filename[0], ".", 1); | |
331 | set_de_type(de, inode); | |
332 | ||
333 | de = &d->dentry[1]; | |
334 | de->hash_code = 0; | |
335 | de->name_len = cpu_to_le16(2); | |
336 | de->ino = cpu_to_le32(parent->i_ino); | |
337 | memcpy(d->filename[1], "..", 2); | |
338 | set_de_type(de, inode); | |
339 | ||
340 | test_and_set_bit_le(0, (void *)d->bitmap); | |
341 | test_and_set_bit_le(1, (void *)d->bitmap); | |
342 | } | |
343 | ||
44a83ff6 JK |
344 | static int make_empty_dir(struct inode *inode, |
345 | struct inode *parent, struct page *page) | |
39936837 JK |
346 | { |
347 | struct page *dentry_page; | |
348 | struct f2fs_dentry_block *dentry_blk; | |
062a3e7b | 349 | struct f2fs_dentry_ptr d; |
39936837 | 350 | |
622f28ae CY |
351 | if (f2fs_has_inline_dentry(inode)) |
352 | return make_empty_inline_dir(inode, parent, page); | |
353 | ||
44a83ff6 | 354 | dentry_page = get_new_data_page(inode, page, 0, true); |
39936837 JK |
355 | if (IS_ERR(dentry_page)) |
356 | return PTR_ERR(dentry_page); | |
357 | ||
1c3bb978 | 358 | dentry_blk = kmap_atomic(dentry_page); |
39936837 | 359 | |
062a3e7b JK |
360 | make_dentry_ptr(&d, (void *)dentry_blk, 1); |
361 | do_make_empty_dir(inode, parent, &d); | |
39936837 | 362 | |
1c3bb978 | 363 | kunmap_atomic(dentry_blk); |
39936837 JK |
364 | |
365 | set_page_dirty(dentry_page); | |
366 | f2fs_put_page(dentry_page, 1); | |
367 | return 0; | |
368 | } | |
369 | ||
bce8d112 JK |
370 | struct page *init_inode_metadata(struct inode *inode, struct inode *dir, |
371 | const struct qstr *name, struct page *dpage) | |
6b4ea016 | 372 | { |
44a83ff6 JK |
373 | struct page *page; |
374 | int err; | |
375 | ||
b97a9b5d | 376 | if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) { |
a014e037 | 377 | page = new_inode_page(inode); |
44a83ff6 JK |
378 | if (IS_ERR(page)) |
379 | return page; | |
6b4ea016 JK |
380 | |
381 | if (S_ISDIR(inode->i_mode)) { | |
44a83ff6 JK |
382 | err = make_empty_dir(inode, dir, page); |
383 | if (err) | |
384 | goto error; | |
6b4ea016 JK |
385 | } |
386 | ||
bce8d112 | 387 | err = f2fs_init_acl(inode, dir, page, dpage); |
44a83ff6 | 388 | if (err) |
a8865372 | 389 | goto put_error; |
44a83ff6 | 390 | |
8ae8f162 JK |
391 | err = f2fs_init_security(inode, dir, name, page); |
392 | if (err) | |
a8865372 | 393 | goto put_error; |
6b4ea016 | 394 | } else { |
4081363f | 395 | page = get_node_page(F2FS_I_SB(dir), inode->i_ino); |
44a83ff6 JK |
396 | if (IS_ERR(page)) |
397 | return page; | |
398 | ||
44a83ff6 | 399 | set_cold_node(inode, page); |
6b4ea016 | 400 | } |
44a83ff6 | 401 | |
b97a9b5d JK |
402 | if (name) |
403 | init_dent_inode(name, page); | |
44a83ff6 | 404 | |
83d5d6f6 JK |
405 | /* |
406 | * This file should be checkpointed during fsync. | |
407 | * We lost i_pino from now on. | |
408 | */ | |
6b4ea016 | 409 | if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) { |
354a3399 | 410 | file_lost_pino(inode); |
50732df0 CY |
411 | /* |
412 | * If link the tmpfile to alias through linkat path, | |
413 | * we should remove this inode from orphan list. | |
414 | */ | |
415 | if (inode->i_nlink == 0) | |
4081363f | 416 | remove_orphan_inode(F2FS_I_SB(dir), inode->i_ino); |
6b4ea016 | 417 | inc_nlink(inode); |
6b4ea016 | 418 | } |
44a83ff6 JK |
419 | return page; |
420 | ||
a8865372 | 421 | put_error: |
44a83ff6 | 422 | f2fs_put_page(page, 1); |
90d72459 | 423 | error: |
bd859c65 JK |
424 | /* once the failed inode becomes a bad inode, i_mode is S_IFREG */ |
425 | truncate_inode_pages(&inode->i_data, 0); | |
764aa3e9 | 426 | truncate_blocks(inode, 0, false); |
bd859c65 | 427 | remove_dirty_dir_inode(inode); |
44a83ff6 JK |
428 | remove_inode_page(inode); |
429 | return ERR_PTR(err); | |
6b4ea016 JK |
430 | } |
431 | ||
dbeacf02 | 432 | void update_parent_metadata(struct inode *dir, struct inode *inode, |
6b4ea016 JK |
433 | unsigned int current_depth) |
434 | { | |
6b4ea016 JK |
435 | if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) { |
436 | if (S_ISDIR(inode->i_mode)) { | |
437 | inc_nlink(dir); | |
699489bb | 438 | set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR); |
6b4ea016 JK |
439 | } |
440 | clear_inode_flag(F2FS_I(inode), FI_NEW_INODE); | |
441 | } | |
442 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; | |
a18ff063 JK |
443 | mark_inode_dirty(dir); |
444 | ||
6b4ea016 JK |
445 | if (F2FS_I(dir)->i_current_depth != current_depth) { |
446 | F2FS_I(dir)->i_current_depth = current_depth; | |
699489bb | 447 | set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR); |
6b4ea016 JK |
448 | } |
449 | ||
6b4ea016 JK |
450 | if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) |
451 | clear_inode_flag(F2FS_I(inode), FI_INC_LINK); | |
452 | } | |
453 | ||
a82afa20 | 454 | int room_for_filename(const void *bitmap, int slots, int max_slots) |
6b4ea016 JK |
455 | { |
456 | int bit_start = 0; | |
457 | int zero_start, zero_end; | |
458 | next: | |
a82afa20 JK |
459 | zero_start = find_next_zero_bit_le(bitmap, max_slots, bit_start); |
460 | if (zero_start >= max_slots) | |
461 | return max_slots; | |
462 | ||
463 | zero_end = find_next_bit_le(bitmap, max_slots, zero_start); | |
6b4ea016 JK |
464 | if (zero_end - zero_start >= slots) |
465 | return zero_start; | |
466 | ||
467 | bit_start = zero_end + 1; | |
468 | ||
a82afa20 JK |
469 | if (zero_end + 1 >= max_slots) |
470 | return max_slots; | |
6b4ea016 JK |
471 | goto next; |
472 | } | |
473 | ||
3b4d732a CY |
474 | void f2fs_update_dentry(struct inode *inode, struct f2fs_dentry_ptr *d, |
475 | const struct qstr *name, f2fs_hash_t name_hash, | |
476 | unsigned int bit_pos) | |
477 | { | |
478 | struct f2fs_dir_entry *de; | |
479 | int slots = GET_DENTRY_SLOTS(name->len); | |
480 | int i; | |
481 | ||
482 | de = &d->dentry[bit_pos]; | |
483 | de->hash_code = name_hash; | |
484 | de->name_len = cpu_to_le16(name->len); | |
485 | memcpy(d->filename[bit_pos], name->name, name->len); | |
486 | de->ino = cpu_to_le32(inode->i_ino); | |
487 | set_de_type(de, inode); | |
488 | for (i = 0; i < slots; i++) | |
489 | test_and_set_bit_le(bit_pos + i, (void *)d->bitmap); | |
490 | } | |
491 | ||
39936837 | 492 | /* |
4f4124d0 CY |
493 | * Caller should grab and release a rwsem by calling f2fs_lock_op() and |
494 | * f2fs_unlock_op(). | |
39936837 | 495 | */ |
6c311ec6 CF |
496 | int __f2fs_add_link(struct inode *dir, const struct qstr *name, |
497 | struct inode *inode) | |
6b4ea016 JK |
498 | { |
499 | unsigned int bit_pos; | |
500 | unsigned int level; | |
501 | unsigned int current_depth; | |
502 | unsigned long bidx, block; | |
503 | f2fs_hash_t dentry_hash; | |
6b4ea016 | 504 | unsigned int nbucket, nblock; |
b7f7a5e0 | 505 | size_t namelen = name->len; |
6b4ea016 JK |
506 | struct page *dentry_page = NULL; |
507 | struct f2fs_dentry_block *dentry_blk = NULL; | |
3b4d732a | 508 | struct f2fs_dentry_ptr d; |
457d08ee | 509 | int slots = GET_DENTRY_SLOTS(namelen); |
44a83ff6 | 510 | struct page *page; |
6b4ea016 | 511 | int err = 0; |
6b4ea016 | 512 | |
622f28ae CY |
513 | if (f2fs_has_inline_dentry(dir)) { |
514 | err = f2fs_add_inline_entry(dir, name, inode); | |
515 | if (!err || err != -EAGAIN) | |
516 | return err; | |
517 | else | |
518 | err = 0; | |
519 | } | |
520 | ||
eee6160f | 521 | dentry_hash = f2fs_dentry_hash(name); |
6b4ea016 JK |
522 | level = 0; |
523 | current_depth = F2FS_I(dir)->i_current_depth; | |
524 | if (F2FS_I(dir)->chash == dentry_hash) { | |
525 | level = F2FS_I(dir)->clevel; | |
526 | F2FS_I(dir)->chash = 0; | |
527 | } | |
528 | ||
529 | start: | |
cfb271d4 | 530 | if (unlikely(current_depth == MAX_DIR_HASH_DEPTH)) |
6b4ea016 JK |
531 | return -ENOSPC; |
532 | ||
533 | /* Increase the depth, if required */ | |
534 | if (level == current_depth) | |
535 | ++current_depth; | |
536 | ||
38431545 | 537 | nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level); |
6b4ea016 JK |
538 | nblock = bucket_blocks(level); |
539 | ||
38431545 JK |
540 | bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level, |
541 | (le32_to_cpu(dentry_hash) % nbucket)); | |
6b4ea016 JK |
542 | |
543 | for (block = bidx; block <= (bidx + nblock - 1); block++) { | |
64aa7ed9 | 544 | dentry_page = get_new_data_page(dir, NULL, block, true); |
39936837 | 545 | if (IS_ERR(dentry_page)) |
6b4ea016 | 546 | return PTR_ERR(dentry_page); |
6b4ea016 JK |
547 | |
548 | dentry_blk = kmap(dentry_page); | |
a82afa20 JK |
549 | bit_pos = room_for_filename(&dentry_blk->dentry_bitmap, |
550 | slots, NR_DENTRY_IN_BLOCK); | |
6b4ea016 JK |
551 | if (bit_pos < NR_DENTRY_IN_BLOCK) |
552 | goto add_dentry; | |
553 | ||
554 | kunmap(dentry_page); | |
555 | f2fs_put_page(dentry_page, 1); | |
6b4ea016 JK |
556 | } |
557 | ||
558 | /* Move to next level to find the empty slot for new dentry */ | |
559 | ++level; | |
560 | goto start; | |
561 | add_dentry: | |
3cb5ad15 | 562 | f2fs_wait_on_page_writeback(dentry_page, DATA); |
6b4ea016 | 563 | |
d928bfbf | 564 | down_write(&F2FS_I(inode)->i_sem); |
bce8d112 | 565 | page = init_inode_metadata(inode, dir, name, NULL); |
44a83ff6 JK |
566 | if (IS_ERR(page)) { |
567 | err = PTR_ERR(page); | |
568 | goto fail; | |
569 | } | |
3b4d732a CY |
570 | |
571 | make_dentry_ptr(&d, (void *)dentry_blk, 1); | |
572 | f2fs_update_dentry(inode, &d, name, dentry_hash, bit_pos); | |
573 | ||
6b4ea016 | 574 | set_page_dirty(dentry_page); |
6666e6aa | 575 | |
44a83ff6 | 576 | /* we don't need to mark_inode_dirty now */ |
6666e6aa | 577 | F2FS_I(inode)->i_pino = dir->i_ino; |
44a83ff6 JK |
578 | update_inode(inode, page); |
579 | f2fs_put_page(page, 1); | |
580 | ||
581 | update_parent_metadata(dir, inode, current_depth); | |
6b4ea016 | 582 | fail: |
d928bfbf JK |
583 | up_write(&F2FS_I(inode)->i_sem); |
584 | ||
924a2ddb JK |
585 | if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR)) { |
586 | update_inode_page(dir); | |
587 | clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR); | |
588 | } | |
6b4ea016 JK |
589 | kunmap(dentry_page); |
590 | f2fs_put_page(dentry_page, 1); | |
6b4ea016 JK |
591 | return err; |
592 | } | |
593 | ||
b97a9b5d JK |
594 | int f2fs_do_tmpfile(struct inode *inode, struct inode *dir) |
595 | { | |
596 | struct page *page; | |
597 | int err = 0; | |
598 | ||
599 | down_write(&F2FS_I(inode)->i_sem); | |
bce8d112 | 600 | page = init_inode_metadata(inode, dir, NULL, NULL); |
b97a9b5d JK |
601 | if (IS_ERR(page)) { |
602 | err = PTR_ERR(page); | |
603 | goto fail; | |
604 | } | |
605 | /* we don't need to mark_inode_dirty now */ | |
606 | update_inode(inode, page); | |
607 | f2fs_put_page(page, 1); | |
608 | ||
609 | clear_inode_flag(F2FS_I(inode), FI_NEW_INODE); | |
610 | fail: | |
611 | up_write(&F2FS_I(inode)->i_sem); | |
612 | return err; | |
613 | } | |
614 | ||
dbeacf02 CY |
615 | void f2fs_drop_nlink(struct inode *dir, struct inode *inode, struct page *page) |
616 | { | |
617 | struct f2fs_sb_info *sbi = F2FS_I_SB(dir); | |
618 | ||
619 | down_write(&F2FS_I(inode)->i_sem); | |
620 | ||
621 | if (S_ISDIR(inode->i_mode)) { | |
622 | drop_nlink(dir); | |
623 | if (page) | |
624 | update_inode(dir, page); | |
625 | else | |
626 | update_inode_page(dir); | |
627 | } | |
628 | inode->i_ctime = CURRENT_TIME; | |
629 | ||
630 | drop_nlink(inode); | |
631 | if (S_ISDIR(inode->i_mode)) { | |
632 | drop_nlink(inode); | |
633 | i_size_write(inode, 0); | |
634 | } | |
635 | up_write(&F2FS_I(inode)->i_sem); | |
636 | update_inode_page(inode); | |
637 | ||
638 | if (inode->i_nlink == 0) | |
639 | add_orphan_inode(sbi, inode->i_ino); | |
640 | else | |
641 | release_orphan_inode(sbi); | |
642 | } | |
643 | ||
0a8165d7 | 644 | /* |
e1c42045 | 645 | * It only removes the dentry from the dentry page, corresponding name |
6b4ea016 JK |
646 | * entry in name page does not need to be touched during deletion. |
647 | */ | |
648 | void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page, | |
dbeacf02 | 649 | struct inode *dir, struct inode *inode) |
6b4ea016 JK |
650 | { |
651 | struct f2fs_dentry_block *dentry_blk; | |
652 | unsigned int bit_pos; | |
457d08ee | 653 | int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len)); |
6b4ea016 JK |
654 | int i; |
655 | ||
622f28ae CY |
656 | if (f2fs_has_inline_dentry(dir)) |
657 | return f2fs_delete_inline_entry(dentry, page, dir, inode); | |
658 | ||
6b4ea016 | 659 | lock_page(page); |
3cb5ad15 | 660 | f2fs_wait_on_page_writeback(page, DATA); |
6b4ea016 | 661 | |
1c3bb978 GZ |
662 | dentry_blk = page_address(page); |
663 | bit_pos = dentry - dentry_blk->dentry; | |
6b4ea016 | 664 | for (i = 0; i < slots; i++) |
1f7732fe | 665 | clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap); |
6b4ea016 JK |
666 | |
667 | /* Let's check and deallocate this dentry page */ | |
668 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
669 | NR_DENTRY_IN_BLOCK, | |
670 | 0); | |
671 | kunmap(page); /* kunmap - pair of f2fs_find_entry */ | |
672 | set_page_dirty(page); | |
673 | ||
674 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; | |
675 | ||
dbeacf02 CY |
676 | if (inode) |
677 | f2fs_drop_nlink(dir, inode, NULL); | |
6b4ea016 JK |
678 | |
679 | if (bit_pos == NR_DENTRY_IN_BLOCK) { | |
6b4ea016 JK |
680 | truncate_hole(dir, page->index, page->index + 1); |
681 | clear_page_dirty_for_io(page); | |
2bca1e23 | 682 | ClearPagePrivate(page); |
6b4ea016 | 683 | ClearPageUptodate(page); |
a7ffdbe2 | 684 | inode_dec_dirty_pages(dir); |
6b4ea016 | 685 | } |
508198be | 686 | f2fs_put_page(page, 1); |
6b4ea016 JK |
687 | } |
688 | ||
689 | bool f2fs_empty_dir(struct inode *dir) | |
690 | { | |
691 | unsigned long bidx; | |
692 | struct page *dentry_page; | |
693 | unsigned int bit_pos; | |
dbeacf02 | 694 | struct f2fs_dentry_block *dentry_blk; |
6b4ea016 JK |
695 | unsigned long nblock = dir_blocks(dir); |
696 | ||
622f28ae CY |
697 | if (f2fs_has_inline_dentry(dir)) |
698 | return f2fs_empty_inline_dir(dir); | |
699 | ||
6b4ea016 | 700 | for (bidx = 0; bidx < nblock; bidx++) { |
6b4ea016 JK |
701 | dentry_page = get_lock_data_page(dir, bidx); |
702 | if (IS_ERR(dentry_page)) { | |
703 | if (PTR_ERR(dentry_page) == -ENOENT) | |
704 | continue; | |
705 | else | |
706 | return false; | |
707 | } | |
708 | ||
1c3bb978 | 709 | dentry_blk = kmap_atomic(dentry_page); |
6b4ea016 JK |
710 | if (bidx == 0) |
711 | bit_pos = 2; | |
712 | else | |
713 | bit_pos = 0; | |
714 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
715 | NR_DENTRY_IN_BLOCK, | |
716 | bit_pos); | |
1c3bb978 | 717 | kunmap_atomic(dentry_blk); |
6b4ea016 JK |
718 | |
719 | f2fs_put_page(dentry_page, 1); | |
720 | ||
721 | if (bit_pos < NR_DENTRY_IN_BLOCK) | |
722 | return false; | |
723 | } | |
724 | return true; | |
725 | } | |
726 | ||
7b3cd7d6 JK |
727 | bool f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d, |
728 | unsigned int start_pos) | |
38594de7 JK |
729 | { |
730 | unsigned char d_type = DT_UNKNOWN; | |
731 | unsigned int bit_pos; | |
732 | struct f2fs_dir_entry *de = NULL; | |
733 | ||
7b3cd7d6 | 734 | bit_pos = ((unsigned long)ctx->pos % d->max); |
38594de7 | 735 | |
7b3cd7d6 JK |
736 | while (bit_pos < d->max) { |
737 | bit_pos = find_next_bit_le(d->bitmap, d->max, bit_pos); | |
738 | if (bit_pos >= d->max) | |
38594de7 JK |
739 | break; |
740 | ||
7b3cd7d6 | 741 | de = &d->dentry[bit_pos]; |
38594de7 JK |
742 | if (de->file_type < F2FS_FT_MAX) |
743 | d_type = f2fs_filetype_table[de->file_type]; | |
744 | else | |
745 | d_type = DT_UNKNOWN; | |
7b3cd7d6 | 746 | if (!dir_emit(ctx, d->filename[bit_pos], |
38594de7 JK |
747 | le16_to_cpu(de->name_len), |
748 | le32_to_cpu(de->ino), d_type)) | |
749 | return true; | |
750 | ||
751 | bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len)); | |
752 | ctx->pos = start_pos + bit_pos; | |
753 | } | |
754 | return false; | |
755 | } | |
756 | ||
6f7f231e | 757 | static int f2fs_readdir(struct file *file, struct dir_context *ctx) |
6b4ea016 | 758 | { |
496ad9aa | 759 | struct inode *inode = file_inode(file); |
6b4ea016 | 760 | unsigned long npages = dir_blocks(inode); |
6b4ea016 | 761 | struct f2fs_dentry_block *dentry_blk = NULL; |
6b4ea016 | 762 | struct page *dentry_page = NULL; |
817202d9 | 763 | struct file_ra_state *ra = &file->f_ra; |
6f7f231e | 764 | unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK); |
7b3cd7d6 | 765 | struct f2fs_dentry_ptr d; |
6b4ea016 | 766 | |
622f28ae CY |
767 | if (f2fs_has_inline_dentry(inode)) |
768 | return f2fs_read_inline_dir(file, ctx); | |
769 | ||
817202d9 CY |
770 | /* readahead for multi pages of dir */ |
771 | if (npages - n > 1 && !ra_has_index(ra, n)) | |
772 | page_cache_sync_readahead(inode->i_mapping, ra, file, n, | |
773 | min(npages - n, (pgoff_t)MAX_DIR_RA_PAGES)); | |
774 | ||
6c311ec6 | 775 | for (; n < npages; n++) { |
6b4ea016 JK |
776 | dentry_page = get_lock_data_page(inode, n); |
777 | if (IS_ERR(dentry_page)) | |
778 | continue; | |
779 | ||
6b4ea016 | 780 | dentry_blk = kmap(dentry_page); |
99b072bb | 781 | |
7b3cd7d6 JK |
782 | make_dentry_ptr(&d, (void *)dentry_blk, 1); |
783 | ||
784 | if (f2fs_fill_dentries(ctx, &d, n * NR_DENTRY_IN_BLOCK)) | |
38594de7 JK |
785 | goto stop; |
786 | ||
6f7f231e | 787 | ctx->pos = (n + 1) * NR_DENTRY_IN_BLOCK; |
6b4ea016 JK |
788 | kunmap(dentry_page); |
789 | f2fs_put_page(dentry_page, 1); | |
790 | dentry_page = NULL; | |
791 | } | |
99b072bb | 792 | stop: |
6b4ea016 JK |
793 | if (dentry_page && !IS_ERR(dentry_page)) { |
794 | kunmap(dentry_page); | |
795 | f2fs_put_page(dentry_page, 1); | |
796 | } | |
797 | ||
798 | return 0; | |
799 | } | |
800 | ||
801 | const struct file_operations f2fs_dir_operations = { | |
802 | .llseek = generic_file_llseek, | |
803 | .read = generic_read_dir, | |
6f7f231e | 804 | .iterate = f2fs_readdir, |
6b4ea016 JK |
805 | .fsync = f2fs_sync_file, |
806 | .unlocked_ioctl = f2fs_ioctl, | |
807 | }; |