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Commit | Line | Data |
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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 | ||
510022a8 | 62 | void set_de_type(struct f2fs_dir_entry *de, umode_t mode) |
6b4ea016 | 63 | { |
6b4ea016 JK |
64 | de->file_type = f2fs_type_by_mode[(mode & S_IFMT) >> S_SHIFT]; |
65 | } | |
66 | ||
38431545 JK |
67 | static unsigned long dir_block_index(unsigned int level, |
68 | int dir_level, unsigned int idx) | |
6b4ea016 JK |
69 | { |
70 | unsigned long i; | |
71 | unsigned long bidx = 0; | |
72 | ||
73 | for (i = 0; i < level; i++) | |
38431545 | 74 | bidx += dir_buckets(i, dir_level) * bucket_blocks(i); |
6b4ea016 JK |
75 | bidx += idx * bucket_blocks(level); |
76 | return bidx; | |
77 | } | |
78 | ||
6b4ea016 | 79 | static struct f2fs_dir_entry *find_in_block(struct page *dentry_page, |
6e22c691 JK |
80 | struct f2fs_filename *fname, |
81 | f2fs_hash_t namehash, | |
82 | int *max_slots, | |
4e6ebf6d JK |
83 | struct page **res_page) |
84 | { | |
85 | struct f2fs_dentry_block *dentry_blk; | |
86 | struct f2fs_dir_entry *de; | |
7b3cd7d6 | 87 | struct f2fs_dentry_ptr d; |
4e6ebf6d JK |
88 | |
89 | dentry_blk = (struct f2fs_dentry_block *)kmap(dentry_page); | |
7b3cd7d6 | 90 | |
d8c6822a | 91 | make_dentry_ptr(NULL, &d, (void *)dentry_blk, 1); |
6e22c691 | 92 | de = find_target_dentry(fname, namehash, max_slots, &d); |
4e6ebf6d JK |
93 | if (de) |
94 | *res_page = dentry_page; | |
95 | else | |
96 | kunmap(dentry_page); | |
97 | ||
98 | /* | |
99 | * For the most part, it should be a bug when name_len is zero. | |
100 | * We stop here for figuring out where the bugs has occurred. | |
101 | */ | |
7b3cd7d6 | 102 | f2fs_bug_on(F2FS_P_SB(dentry_page), d.max < 0); |
4e6ebf6d JK |
103 | return de; |
104 | } | |
105 | ||
6e22c691 JK |
106 | struct f2fs_dir_entry *find_target_dentry(struct f2fs_filename *fname, |
107 | f2fs_hash_t namehash, int *max_slots, | |
108 | struct f2fs_dentry_ptr *d) | |
6b4ea016 JK |
109 | { |
110 | struct f2fs_dir_entry *de; | |
5d0c6671 | 111 | unsigned long bit_pos = 0; |
5d0c6671 | 112 | int max_len = 0; |
6e22c691 JK |
113 | struct f2fs_str de_name = FSTR_INIT(NULL, 0); |
114 | struct f2fs_str *name = &fname->disk_name; | |
6b4ea016 | 115 | |
7b3cd7d6 JK |
116 | if (max_slots) |
117 | *max_slots = 0; | |
118 | while (bit_pos < d->max) { | |
119 | if (!test_bit_le(bit_pos, d->bitmap)) { | |
5d0c6671 | 120 | bit_pos++; |
bda19076 | 121 | max_len++; |
5d0c6671 JK |
122 | continue; |
123 | } | |
bda19076 | 124 | |
7b3cd7d6 | 125 | de = &d->dentry[bit_pos]; |
6e22c691 JK |
126 | |
127 | /* encrypted case */ | |
128 | de_name.name = d->filename[bit_pos]; | |
129 | de_name.len = le16_to_cpu(de->name_len); | |
130 | ||
131 | /* show encrypted name */ | |
132 | if (fname->hash) { | |
133 | if (de->hash_code == fname->hash) | |
134 | goto found; | |
135 | } else if (de_name.len == name->len && | |
136 | de->hash_code == namehash && | |
137 | !memcmp(de_name.name, 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, | |
6e22c691 JK |
159 | unsigned int level, |
160 | struct f2fs_filename *fname, | |
161 | struct page **res_page) | |
6b4ea016 | 162 | { |
6e22c691 JK |
163 | struct qstr name = FSTR_TO_QSTR(&fname->disk_name); |
164 | int s = GET_DENTRY_SLOTS(name.len); | |
6b4ea016 JK |
165 | unsigned int nbucket, nblock; |
166 | unsigned int bidx, end_block; | |
167 | struct page *dentry_page; | |
168 | struct f2fs_dir_entry *de = NULL; | |
169 | bool room = false; | |
4e6ebf6d | 170 | int max_slots; |
6e22c691 JK |
171 | f2fs_hash_t namehash; |
172 | ||
173 | namehash = f2fs_dentry_hash(&name); | |
6b4ea016 | 174 | |
9850cf4a | 175 | f2fs_bug_on(F2FS_I_SB(dir), level > MAX_DIR_HASH_DEPTH); |
6b4ea016 | 176 | |
38431545 | 177 | nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level); |
6b4ea016 JK |
178 | nblock = bucket_blocks(level); |
179 | ||
38431545 JK |
180 | bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level, |
181 | le32_to_cpu(namehash) % nbucket); | |
6b4ea016 JK |
182 | end_block = bidx + nblock; |
183 | ||
184 | for (; bidx < end_block; bidx++) { | |
185 | /* no need to allocate new dentry pages to all the indices */ | |
43f3eae1 | 186 | dentry_page = find_data_page(dir, bidx); |
6b4ea016 JK |
187 | if (IS_ERR(dentry_page)) { |
188 | room = true; | |
189 | continue; | |
190 | } | |
191 | ||
6e22c691 JK |
192 | de = find_in_block(dentry_page, fname, namehash, &max_slots, |
193 | res_page); | |
6b4ea016 JK |
194 | if (de) |
195 | break; | |
196 | ||
197 | if (max_slots >= s) | |
198 | room = true; | |
199 | f2fs_put_page(dentry_page, 0); | |
200 | } | |
201 | ||
202 | if (!de && room && F2FS_I(dir)->chash != namehash) { | |
203 | F2FS_I(dir)->chash = namehash; | |
204 | F2FS_I(dir)->clevel = level; | |
205 | } | |
206 | ||
207 | return de; | |
208 | } | |
209 | ||
210 | /* | |
211 | * Find an entry in the specified directory with the wanted name. | |
212 | * It returns the page where the entry was found (as a parameter - res_page), | |
213 | * and the entry itself. Page is returned mapped and unlocked. | |
214 | * Entry is guaranteed to be valid. | |
215 | */ | |
216 | struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir, | |
217 | struct qstr *child, struct page **res_page) | |
218 | { | |
6b4ea016 JK |
219 | unsigned long npages = dir_blocks(dir); |
220 | struct f2fs_dir_entry *de = NULL; | |
6b4ea016 JK |
221 | unsigned int max_depth; |
222 | unsigned int level; | |
6e22c691 JK |
223 | struct f2fs_filename fname; |
224 | int err; | |
6b4ea016 | 225 | |
b1f73b79 YZ |
226 | *res_page = NULL; |
227 | ||
6e22c691 JK |
228 | err = f2fs_fname_setup_filename(dir, child, 1, &fname); |
229 | if (err) | |
230 | return NULL; | |
231 | ||
232 | if (f2fs_has_inline_dentry(dir)) { | |
233 | de = find_in_inline_dir(dir, &fname, res_page); | |
234 | goto out; | |
235 | } | |
622f28ae | 236 | |
6b4ea016 | 237 | if (npages == 0) |
6e22c691 | 238 | goto out; |
6b4ea016 | 239 | |
6b4ea016 JK |
240 | max_depth = F2FS_I(dir)->i_current_depth; |
241 | ||
242 | for (level = 0; level < max_depth; level++) { | |
6e22c691 | 243 | de = find_in_level(dir, level, &fname, res_page); |
6b4ea016 JK |
244 | if (de) |
245 | break; | |
246 | } | |
6e22c691 JK |
247 | out: |
248 | f2fs_fname_free_filename(&fname); | |
6b4ea016 JK |
249 | return de; |
250 | } | |
251 | ||
252 | struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p) | |
253 | { | |
4777f86b NJ |
254 | struct page *page; |
255 | struct f2fs_dir_entry *de; | |
256 | struct f2fs_dentry_block *dentry_blk; | |
6b4ea016 | 257 | |
622f28ae CY |
258 | if (f2fs_has_inline_dentry(dir)) |
259 | return f2fs_parent_inline_dir(dir, p); | |
260 | ||
6b4ea016 JK |
261 | page = get_lock_data_page(dir, 0); |
262 | if (IS_ERR(page)) | |
263 | return NULL; | |
264 | ||
265 | dentry_blk = kmap(page); | |
266 | de = &dentry_blk->dentry[1]; | |
267 | *p = page; | |
268 | unlock_page(page); | |
269 | return de; | |
270 | } | |
271 | ||
272 | ino_t f2fs_inode_by_name(struct inode *dir, struct qstr *qstr) | |
273 | { | |
274 | ino_t res = 0; | |
275 | struct f2fs_dir_entry *de; | |
276 | struct page *page; | |
277 | ||
278 | de = f2fs_find_entry(dir, qstr, &page); | |
279 | if (de) { | |
280 | res = le32_to_cpu(de->ino); | |
9486ba44 | 281 | f2fs_dentry_kunmap(dir, page); |
6b4ea016 JK |
282 | f2fs_put_page(page, 0); |
283 | } | |
284 | ||
285 | return res; | |
286 | } | |
287 | ||
288 | void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de, | |
289 | struct page *page, struct inode *inode) | |
290 | { | |
59a06155 | 291 | enum page_type type = f2fs_has_inline_dentry(dir) ? NODE : DATA; |
6b4ea016 | 292 | lock_page(page); |
59a06155 | 293 | f2fs_wait_on_page_writeback(page, type); |
6b4ea016 | 294 | de->ino = cpu_to_le32(inode->i_ino); |
510022a8 | 295 | set_de_type(de, inode->i_mode); |
5df1f1da | 296 | f2fs_dentry_kunmap(dir, page); |
6b4ea016 JK |
297 | set_page_dirty(page); |
298 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; | |
299 | mark_inode_dirty(dir); | |
6666e6aa | 300 | |
6b4ea016 | 301 | f2fs_put_page(page, 1); |
6b4ea016 JK |
302 | } |
303 | ||
44a83ff6 | 304 | static void init_dent_inode(const struct qstr *name, struct page *ipage) |
6b4ea016 | 305 | { |
58bfaf44 | 306 | struct f2fs_inode *ri; |
6b4ea016 | 307 | |
54b591df JK |
308 | f2fs_wait_on_page_writeback(ipage, NODE); |
309 | ||
53dc9a67 | 310 | /* copy name info. to this inode page */ |
58bfaf44 JK |
311 | ri = F2FS_INODE(ipage); |
312 | ri->i_namelen = cpu_to_le32(name->len); | |
313 | memcpy(ri->i_name, name->name, name->len); | |
6b4ea016 JK |
314 | set_page_dirty(ipage); |
315 | } | |
316 | ||
1cd14caf JK |
317 | int update_dent_inode(struct inode *inode, const struct qstr *name) |
318 | { | |
1cd14caf JK |
319 | struct page *page; |
320 | ||
4081363f | 321 | page = get_node_page(F2FS_I_SB(inode), inode->i_ino); |
1cd14caf JK |
322 | if (IS_ERR(page)) |
323 | return PTR_ERR(page); | |
324 | ||
325 | init_dent_inode(name, page); | |
326 | f2fs_put_page(page, 1); | |
327 | ||
328 | return 0; | |
329 | } | |
330 | ||
062a3e7b JK |
331 | void do_make_empty_dir(struct inode *inode, struct inode *parent, |
332 | struct f2fs_dentry_ptr *d) | |
333 | { | |
334 | struct f2fs_dir_entry *de; | |
335 | ||
336 | de = &d->dentry[0]; | |
337 | de->name_len = cpu_to_le16(1); | |
338 | de->hash_code = 0; | |
339 | de->ino = cpu_to_le32(inode->i_ino); | |
340 | memcpy(d->filename[0], ".", 1); | |
510022a8 | 341 | set_de_type(de, inode->i_mode); |
062a3e7b JK |
342 | |
343 | de = &d->dentry[1]; | |
344 | de->hash_code = 0; | |
345 | de->name_len = cpu_to_le16(2); | |
346 | de->ino = cpu_to_le32(parent->i_ino); | |
347 | memcpy(d->filename[1], "..", 2); | |
cb58463b | 348 | set_de_type(de, parent->i_mode); |
062a3e7b JK |
349 | |
350 | test_and_set_bit_le(0, (void *)d->bitmap); | |
351 | test_and_set_bit_le(1, (void *)d->bitmap); | |
352 | } | |
353 | ||
44a83ff6 JK |
354 | static int make_empty_dir(struct inode *inode, |
355 | struct inode *parent, struct page *page) | |
39936837 JK |
356 | { |
357 | struct page *dentry_page; | |
358 | struct f2fs_dentry_block *dentry_blk; | |
062a3e7b | 359 | struct f2fs_dentry_ptr d; |
39936837 | 360 | |
622f28ae CY |
361 | if (f2fs_has_inline_dentry(inode)) |
362 | return make_empty_inline_dir(inode, parent, page); | |
363 | ||
44a83ff6 | 364 | dentry_page = get_new_data_page(inode, page, 0, true); |
39936837 JK |
365 | if (IS_ERR(dentry_page)) |
366 | return PTR_ERR(dentry_page); | |
367 | ||
1c3bb978 | 368 | dentry_blk = kmap_atomic(dentry_page); |
39936837 | 369 | |
d8c6822a | 370 | make_dentry_ptr(NULL, &d, (void *)dentry_blk, 1); |
062a3e7b | 371 | do_make_empty_dir(inode, parent, &d); |
39936837 | 372 | |
1c3bb978 | 373 | kunmap_atomic(dentry_blk); |
39936837 JK |
374 | |
375 | set_page_dirty(dentry_page); | |
376 | f2fs_put_page(dentry_page, 1); | |
377 | return 0; | |
378 | } | |
379 | ||
bce8d112 JK |
380 | struct page *init_inode_metadata(struct inode *inode, struct inode *dir, |
381 | const struct qstr *name, struct page *dpage) | |
6b4ea016 | 382 | { |
44a83ff6 JK |
383 | struct page *page; |
384 | int err; | |
385 | ||
b97a9b5d | 386 | if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) { |
a014e037 | 387 | page = new_inode_page(inode); |
44a83ff6 JK |
388 | if (IS_ERR(page)) |
389 | return page; | |
6b4ea016 JK |
390 | |
391 | if (S_ISDIR(inode->i_mode)) { | |
44a83ff6 JK |
392 | err = make_empty_dir(inode, dir, page); |
393 | if (err) | |
394 | goto error; | |
6b4ea016 JK |
395 | } |
396 | ||
bce8d112 | 397 | err = f2fs_init_acl(inode, dir, page, dpage); |
44a83ff6 | 398 | if (err) |
a8865372 | 399 | goto put_error; |
44a83ff6 | 400 | |
8ae8f162 JK |
401 | err = f2fs_init_security(inode, dir, name, page); |
402 | if (err) | |
a8865372 | 403 | goto put_error; |
fcc85a4d JK |
404 | |
405 | if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode)) { | |
406 | err = f2fs_inherit_context(dir, inode, page); | |
407 | if (err) | |
408 | goto put_error; | |
409 | } | |
6b4ea016 | 410 | } else { |
4081363f | 411 | page = get_node_page(F2FS_I_SB(dir), inode->i_ino); |
44a83ff6 JK |
412 | if (IS_ERR(page)) |
413 | return page; | |
414 | ||
44a83ff6 | 415 | set_cold_node(inode, page); |
6b4ea016 | 416 | } |
44a83ff6 | 417 | |
b97a9b5d JK |
418 | if (name) |
419 | init_dent_inode(name, page); | |
44a83ff6 | 420 | |
83d5d6f6 JK |
421 | /* |
422 | * This file should be checkpointed during fsync. | |
423 | * We lost i_pino from now on. | |
424 | */ | |
6b4ea016 | 425 | if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) { |
354a3399 | 426 | file_lost_pino(inode); |
50732df0 CY |
427 | /* |
428 | * If link the tmpfile to alias through linkat path, | |
429 | * we should remove this inode from orphan list. | |
430 | */ | |
431 | if (inode->i_nlink == 0) | |
4081363f | 432 | remove_orphan_inode(F2FS_I_SB(dir), inode->i_ino); |
6b4ea016 | 433 | inc_nlink(inode); |
6b4ea016 | 434 | } |
44a83ff6 JK |
435 | return page; |
436 | ||
a8865372 | 437 | put_error: |
44a83ff6 | 438 | f2fs_put_page(page, 1); |
90d72459 | 439 | error: |
bd859c65 JK |
440 | /* once the failed inode becomes a bad inode, i_mode is S_IFREG */ |
441 | truncate_inode_pages(&inode->i_data, 0); | |
764aa3e9 | 442 | truncate_blocks(inode, 0, false); |
bd859c65 | 443 | remove_dirty_dir_inode(inode); |
44a83ff6 JK |
444 | remove_inode_page(inode); |
445 | return ERR_PTR(err); | |
6b4ea016 JK |
446 | } |
447 | ||
dbeacf02 | 448 | void update_parent_metadata(struct inode *dir, struct inode *inode, |
6b4ea016 JK |
449 | unsigned int current_depth) |
450 | { | |
510022a8 | 451 | if (inode && is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) { |
6b4ea016 JK |
452 | if (S_ISDIR(inode->i_mode)) { |
453 | inc_nlink(dir); | |
699489bb | 454 | set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR); |
6b4ea016 JK |
455 | } |
456 | clear_inode_flag(F2FS_I(inode), FI_NEW_INODE); | |
457 | } | |
458 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; | |
a18ff063 JK |
459 | mark_inode_dirty(dir); |
460 | ||
6b4ea016 JK |
461 | if (F2FS_I(dir)->i_current_depth != current_depth) { |
462 | F2FS_I(dir)->i_current_depth = current_depth; | |
699489bb | 463 | set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR); |
6b4ea016 JK |
464 | } |
465 | ||
510022a8 | 466 | if (inode && is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) |
6b4ea016 JK |
467 | clear_inode_flag(F2FS_I(inode), FI_INC_LINK); |
468 | } | |
469 | ||
a82afa20 | 470 | int room_for_filename(const void *bitmap, int slots, int max_slots) |
6b4ea016 JK |
471 | { |
472 | int bit_start = 0; | |
473 | int zero_start, zero_end; | |
474 | next: | |
a82afa20 JK |
475 | zero_start = find_next_zero_bit_le(bitmap, max_slots, bit_start); |
476 | if (zero_start >= max_slots) | |
477 | return max_slots; | |
478 | ||
479 | zero_end = find_next_bit_le(bitmap, max_slots, zero_start); | |
6b4ea016 JK |
480 | if (zero_end - zero_start >= slots) |
481 | return zero_start; | |
482 | ||
483 | bit_start = zero_end + 1; | |
484 | ||
a82afa20 JK |
485 | if (zero_end + 1 >= max_slots) |
486 | return max_slots; | |
6b4ea016 JK |
487 | goto next; |
488 | } | |
489 | ||
510022a8 | 490 | void f2fs_update_dentry(nid_t ino, umode_t mode, struct f2fs_dentry_ptr *d, |
3b4d732a CY |
491 | const struct qstr *name, f2fs_hash_t name_hash, |
492 | unsigned int bit_pos) | |
493 | { | |
494 | struct f2fs_dir_entry *de; | |
495 | int slots = GET_DENTRY_SLOTS(name->len); | |
496 | int i; | |
497 | ||
498 | de = &d->dentry[bit_pos]; | |
499 | de->hash_code = name_hash; | |
500 | de->name_len = cpu_to_le16(name->len); | |
501 | memcpy(d->filename[bit_pos], name->name, name->len); | |
510022a8 JK |
502 | de->ino = cpu_to_le32(ino); |
503 | set_de_type(de, mode); | |
3b4d732a CY |
504 | for (i = 0; i < slots; i++) |
505 | test_and_set_bit_le(bit_pos + i, (void *)d->bitmap); | |
506 | } | |
507 | ||
39936837 | 508 | /* |
4f4124d0 CY |
509 | * Caller should grab and release a rwsem by calling f2fs_lock_op() and |
510 | * f2fs_unlock_op(). | |
39936837 | 511 | */ |
6c311ec6 | 512 | int __f2fs_add_link(struct inode *dir, const struct qstr *name, |
510022a8 | 513 | struct inode *inode, nid_t ino, umode_t mode) |
6b4ea016 JK |
514 | { |
515 | unsigned int bit_pos; | |
516 | unsigned int level; | |
517 | unsigned int current_depth; | |
518 | unsigned long bidx, block; | |
519 | f2fs_hash_t dentry_hash; | |
6b4ea016 | 520 | unsigned int nbucket, nblock; |
6b4ea016 JK |
521 | struct page *dentry_page = NULL; |
522 | struct f2fs_dentry_block *dentry_blk = NULL; | |
3b4d732a | 523 | struct f2fs_dentry_ptr d; |
510022a8 | 524 | struct page *page = NULL; |
9ea97163 JK |
525 | struct f2fs_filename fname; |
526 | struct qstr new_name; | |
527 | int slots, err; | |
528 | ||
529 | err = f2fs_fname_setup_filename(dir, name, 0, &fname); | |
530 | if (err) | |
531 | return err; | |
532 | ||
533 | new_name.name = fname_name(&fname); | |
534 | new_name.len = fname_len(&fname); | |
6b4ea016 | 535 | |
622f28ae | 536 | if (f2fs_has_inline_dentry(dir)) { |
9ea97163 | 537 | err = f2fs_add_inline_entry(dir, &new_name, inode, ino, mode); |
622f28ae | 538 | if (!err || err != -EAGAIN) |
9ea97163 | 539 | goto out; |
622f28ae CY |
540 | else |
541 | err = 0; | |
542 | } | |
543 | ||
6b4ea016 | 544 | level = 0; |
9ea97163 JK |
545 | slots = GET_DENTRY_SLOTS(new_name.len); |
546 | dentry_hash = f2fs_dentry_hash(&new_name); | |
547 | ||
6b4ea016 JK |
548 | current_depth = F2FS_I(dir)->i_current_depth; |
549 | if (F2FS_I(dir)->chash == dentry_hash) { | |
550 | level = F2FS_I(dir)->clevel; | |
551 | F2FS_I(dir)->chash = 0; | |
552 | } | |
553 | ||
554 | start: | |
9ea97163 JK |
555 | if (unlikely(current_depth == MAX_DIR_HASH_DEPTH)) { |
556 | err = -ENOSPC; | |
557 | goto out; | |
558 | } | |
6b4ea016 JK |
559 | |
560 | /* Increase the depth, if required */ | |
561 | if (level == current_depth) | |
562 | ++current_depth; | |
563 | ||
38431545 | 564 | nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level); |
6b4ea016 JK |
565 | nblock = bucket_blocks(level); |
566 | ||
38431545 JK |
567 | bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level, |
568 | (le32_to_cpu(dentry_hash) % nbucket)); | |
6b4ea016 JK |
569 | |
570 | for (block = bidx; block <= (bidx + nblock - 1); block++) { | |
64aa7ed9 | 571 | dentry_page = get_new_data_page(dir, NULL, block, true); |
9ea97163 JK |
572 | if (IS_ERR(dentry_page)) { |
573 | err = PTR_ERR(dentry_page); | |
574 | goto out; | |
575 | } | |
6b4ea016 JK |
576 | |
577 | dentry_blk = kmap(dentry_page); | |
a82afa20 JK |
578 | bit_pos = room_for_filename(&dentry_blk->dentry_bitmap, |
579 | slots, NR_DENTRY_IN_BLOCK); | |
6b4ea016 JK |
580 | if (bit_pos < NR_DENTRY_IN_BLOCK) |
581 | goto add_dentry; | |
582 | ||
583 | kunmap(dentry_page); | |
584 | f2fs_put_page(dentry_page, 1); | |
6b4ea016 JK |
585 | } |
586 | ||
587 | /* Move to next level to find the empty slot for new dentry */ | |
588 | ++level; | |
589 | goto start; | |
590 | add_dentry: | |
3cb5ad15 | 591 | f2fs_wait_on_page_writeback(dentry_page, DATA); |
6b4ea016 | 592 | |
510022a8 JK |
593 | if (inode) { |
594 | down_write(&F2FS_I(inode)->i_sem); | |
9ea97163 | 595 | page = init_inode_metadata(inode, dir, &new_name, NULL); |
510022a8 JK |
596 | if (IS_ERR(page)) { |
597 | err = PTR_ERR(page); | |
598 | goto fail; | |
599 | } | |
44a83ff6 | 600 | } |
3b4d732a | 601 | |
d8c6822a | 602 | make_dentry_ptr(NULL, &d, (void *)dentry_blk, 1); |
9ea97163 | 603 | f2fs_update_dentry(ino, mode, &d, &new_name, dentry_hash, bit_pos); |
3b4d732a | 604 | |
6b4ea016 | 605 | set_page_dirty(dentry_page); |
6666e6aa | 606 | |
510022a8 JK |
607 | if (inode) { |
608 | /* we don't need to mark_inode_dirty now */ | |
609 | F2FS_I(inode)->i_pino = dir->i_ino; | |
610 | update_inode(inode, page); | |
611 | f2fs_put_page(page, 1); | |
612 | } | |
44a83ff6 JK |
613 | |
614 | update_parent_metadata(dir, inode, current_depth); | |
6b4ea016 | 615 | fail: |
510022a8 JK |
616 | if (inode) |
617 | up_write(&F2FS_I(inode)->i_sem); | |
d928bfbf | 618 | |
924a2ddb JK |
619 | if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR)) { |
620 | update_inode_page(dir); | |
621 | clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR); | |
622 | } | |
6b4ea016 JK |
623 | kunmap(dentry_page); |
624 | f2fs_put_page(dentry_page, 1); | |
9ea97163 JK |
625 | out: |
626 | f2fs_fname_free_filename(&fname); | |
6b4ea016 JK |
627 | return err; |
628 | } | |
629 | ||
b97a9b5d JK |
630 | int f2fs_do_tmpfile(struct inode *inode, struct inode *dir) |
631 | { | |
632 | struct page *page; | |
633 | int err = 0; | |
634 | ||
635 | down_write(&F2FS_I(inode)->i_sem); | |
bce8d112 | 636 | page = init_inode_metadata(inode, dir, NULL, NULL); |
b97a9b5d JK |
637 | if (IS_ERR(page)) { |
638 | err = PTR_ERR(page); | |
639 | goto fail; | |
640 | } | |
641 | /* we don't need to mark_inode_dirty now */ | |
642 | update_inode(inode, page); | |
643 | f2fs_put_page(page, 1); | |
644 | ||
645 | clear_inode_flag(F2FS_I(inode), FI_NEW_INODE); | |
646 | fail: | |
647 | up_write(&F2FS_I(inode)->i_sem); | |
648 | return err; | |
649 | } | |
650 | ||
dbeacf02 CY |
651 | void f2fs_drop_nlink(struct inode *dir, struct inode *inode, struct page *page) |
652 | { | |
653 | struct f2fs_sb_info *sbi = F2FS_I_SB(dir); | |
654 | ||
655 | down_write(&F2FS_I(inode)->i_sem); | |
656 | ||
657 | if (S_ISDIR(inode->i_mode)) { | |
658 | drop_nlink(dir); | |
659 | if (page) | |
660 | update_inode(dir, page); | |
661 | else | |
662 | update_inode_page(dir); | |
663 | } | |
664 | inode->i_ctime = CURRENT_TIME; | |
665 | ||
666 | drop_nlink(inode); | |
667 | if (S_ISDIR(inode->i_mode)) { | |
668 | drop_nlink(inode); | |
669 | i_size_write(inode, 0); | |
670 | } | |
671 | up_write(&F2FS_I(inode)->i_sem); | |
672 | update_inode_page(inode); | |
673 | ||
674 | if (inode->i_nlink == 0) | |
675 | add_orphan_inode(sbi, inode->i_ino); | |
676 | else | |
677 | release_orphan_inode(sbi); | |
678 | } | |
679 | ||
0a8165d7 | 680 | /* |
e1c42045 | 681 | * It only removes the dentry from the dentry page, corresponding name |
6b4ea016 JK |
682 | * entry in name page does not need to be touched during deletion. |
683 | */ | |
684 | void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page, | |
dbeacf02 | 685 | struct inode *dir, struct inode *inode) |
6b4ea016 JK |
686 | { |
687 | struct f2fs_dentry_block *dentry_blk; | |
688 | unsigned int bit_pos; | |
457d08ee | 689 | int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len)); |
6b4ea016 JK |
690 | int i; |
691 | ||
622f28ae CY |
692 | if (f2fs_has_inline_dentry(dir)) |
693 | return f2fs_delete_inline_entry(dentry, page, dir, inode); | |
694 | ||
6b4ea016 | 695 | lock_page(page); |
3cb5ad15 | 696 | f2fs_wait_on_page_writeback(page, DATA); |
6b4ea016 | 697 | |
1c3bb978 GZ |
698 | dentry_blk = page_address(page); |
699 | bit_pos = dentry - dentry_blk->dentry; | |
6b4ea016 | 700 | for (i = 0; i < slots; i++) |
1f7732fe | 701 | clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap); |
6b4ea016 JK |
702 | |
703 | /* Let's check and deallocate this dentry page */ | |
704 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
705 | NR_DENTRY_IN_BLOCK, | |
706 | 0); | |
707 | kunmap(page); /* kunmap - pair of f2fs_find_entry */ | |
708 | set_page_dirty(page); | |
709 | ||
710 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; | |
711 | ||
dbeacf02 CY |
712 | if (inode) |
713 | f2fs_drop_nlink(dir, inode, NULL); | |
6b4ea016 JK |
714 | |
715 | if (bit_pos == NR_DENTRY_IN_BLOCK) { | |
6b4ea016 JK |
716 | truncate_hole(dir, page->index, page->index + 1); |
717 | clear_page_dirty_for_io(page); | |
2bca1e23 | 718 | ClearPagePrivate(page); |
6b4ea016 | 719 | ClearPageUptodate(page); |
a7ffdbe2 | 720 | inode_dec_dirty_pages(dir); |
6b4ea016 | 721 | } |
508198be | 722 | f2fs_put_page(page, 1); |
6b4ea016 JK |
723 | } |
724 | ||
725 | bool f2fs_empty_dir(struct inode *dir) | |
726 | { | |
727 | unsigned long bidx; | |
728 | struct page *dentry_page; | |
729 | unsigned int bit_pos; | |
dbeacf02 | 730 | struct f2fs_dentry_block *dentry_blk; |
6b4ea016 JK |
731 | unsigned long nblock = dir_blocks(dir); |
732 | ||
622f28ae CY |
733 | if (f2fs_has_inline_dentry(dir)) |
734 | return f2fs_empty_inline_dir(dir); | |
735 | ||
6b4ea016 | 736 | for (bidx = 0; bidx < nblock; bidx++) { |
6b4ea016 JK |
737 | dentry_page = get_lock_data_page(dir, bidx); |
738 | if (IS_ERR(dentry_page)) { | |
739 | if (PTR_ERR(dentry_page) == -ENOENT) | |
740 | continue; | |
741 | else | |
742 | return false; | |
743 | } | |
744 | ||
1c3bb978 | 745 | dentry_blk = kmap_atomic(dentry_page); |
6b4ea016 JK |
746 | if (bidx == 0) |
747 | bit_pos = 2; | |
748 | else | |
749 | bit_pos = 0; | |
750 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
751 | NR_DENTRY_IN_BLOCK, | |
752 | bit_pos); | |
1c3bb978 | 753 | kunmap_atomic(dentry_blk); |
6b4ea016 JK |
754 | |
755 | f2fs_put_page(dentry_page, 1); | |
756 | ||
757 | if (bit_pos < NR_DENTRY_IN_BLOCK) | |
758 | return false; | |
759 | } | |
760 | return true; | |
761 | } | |
762 | ||
7b3cd7d6 | 763 | bool f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d, |
d8c6822a | 764 | unsigned int start_pos, struct f2fs_str *fstr) |
38594de7 JK |
765 | { |
766 | unsigned char d_type = DT_UNKNOWN; | |
767 | unsigned int bit_pos; | |
768 | struct f2fs_dir_entry *de = NULL; | |
d8c6822a | 769 | struct f2fs_str de_name = FSTR_INIT(NULL, 0); |
38594de7 | 770 | |
7b3cd7d6 | 771 | bit_pos = ((unsigned long)ctx->pos % d->max); |
38594de7 | 772 | |
7b3cd7d6 JK |
773 | while (bit_pos < d->max) { |
774 | bit_pos = find_next_bit_le(d->bitmap, d->max, bit_pos); | |
775 | if (bit_pos >= d->max) | |
38594de7 JK |
776 | break; |
777 | ||
7b3cd7d6 | 778 | de = &d->dentry[bit_pos]; |
38594de7 JK |
779 | if (de->file_type < F2FS_FT_MAX) |
780 | d_type = f2fs_filetype_table[de->file_type]; | |
781 | else | |
782 | d_type = DT_UNKNOWN; | |
d8c6822a JK |
783 | |
784 | /* encrypted case */ | |
785 | de_name.name = d->filename[bit_pos]; | |
786 | de_name.len = le16_to_cpu(de->name_len); | |
787 | ||
788 | if (f2fs_encrypted_inode(d->inode)) { | |
789 | int save_len = fstr->len; | |
790 | int ret; | |
791 | ||
792 | ret = f2fs_fname_disk_to_usr(d->inode, &de->hash_code, | |
793 | &de_name, fstr); | |
794 | de_name = *fstr; | |
795 | fstr->len = save_len; | |
796 | if (ret < 0) | |
797 | return true; | |
798 | } | |
799 | ||
800 | if (!dir_emit(ctx, de_name.name, de_name.len, | |
38594de7 JK |
801 | le32_to_cpu(de->ino), d_type)) |
802 | return true; | |
803 | ||
804 | bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len)); | |
805 | ctx->pos = start_pos + bit_pos; | |
806 | } | |
807 | return false; | |
808 | } | |
809 | ||
6f7f231e | 810 | static int f2fs_readdir(struct file *file, struct dir_context *ctx) |
6b4ea016 | 811 | { |
496ad9aa | 812 | struct inode *inode = file_inode(file); |
6b4ea016 | 813 | unsigned long npages = dir_blocks(inode); |
6b4ea016 | 814 | struct f2fs_dentry_block *dentry_blk = NULL; |
6b4ea016 | 815 | struct page *dentry_page = NULL; |
817202d9 | 816 | struct file_ra_state *ra = &file->f_ra; |
6f7f231e | 817 | unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK); |
7b3cd7d6 | 818 | struct f2fs_dentry_ptr d; |
d8c6822a JK |
819 | struct f2fs_str fstr = FSTR_INIT(NULL, 0); |
820 | int err = 0; | |
6b4ea016 | 821 | |
d8c6822a JK |
822 | err = f2fs_setup_fname_crypto(inode); |
823 | if (err) | |
824 | return err; | |
825 | ||
826 | if (f2fs_encrypted_inode(inode)) { | |
827 | err = f2fs_fname_crypto_alloc_buffer(inode, F2FS_NAME_LEN, | |
828 | &fstr); | |
829 | if (err < 0) | |
830 | return err; | |
831 | } | |
832 | ||
833 | if (f2fs_has_inline_dentry(inode)) { | |
834 | err = f2fs_read_inline_dir(file, ctx, &fstr); | |
835 | goto out; | |
836 | } | |
622f28ae | 837 | |
817202d9 CY |
838 | /* readahead for multi pages of dir */ |
839 | if (npages - n > 1 && !ra_has_index(ra, n)) | |
840 | page_cache_sync_readahead(inode->i_mapping, ra, file, n, | |
841 | min(npages - n, (pgoff_t)MAX_DIR_RA_PAGES)); | |
842 | ||
6c311ec6 | 843 | for (; n < npages; n++) { |
6b4ea016 JK |
844 | dentry_page = get_lock_data_page(inode, n); |
845 | if (IS_ERR(dentry_page)) | |
846 | continue; | |
847 | ||
6b4ea016 | 848 | dentry_blk = kmap(dentry_page); |
99b072bb | 849 | |
d8c6822a | 850 | make_dentry_ptr(inode, &d, (void *)dentry_blk, 1); |
7b3cd7d6 | 851 | |
d8c6822a | 852 | if (f2fs_fill_dentries(ctx, &d, n * NR_DENTRY_IN_BLOCK, &fstr)) |
38594de7 JK |
853 | goto stop; |
854 | ||
6f7f231e | 855 | ctx->pos = (n + 1) * NR_DENTRY_IN_BLOCK; |
6b4ea016 JK |
856 | kunmap(dentry_page); |
857 | f2fs_put_page(dentry_page, 1); | |
858 | dentry_page = NULL; | |
859 | } | |
99b072bb | 860 | stop: |
6b4ea016 JK |
861 | if (dentry_page && !IS_ERR(dentry_page)) { |
862 | kunmap(dentry_page); | |
863 | f2fs_put_page(dentry_page, 1); | |
864 | } | |
d8c6822a JK |
865 | out: |
866 | f2fs_fname_crypto_free_buffer(&fstr); | |
867 | return err; | |
6b4ea016 JK |
868 | } |
869 | ||
870 | const struct file_operations f2fs_dir_operations = { | |
871 | .llseek = generic_file_llseek, | |
872 | .read = generic_read_dir, | |
6f7f231e | 873 | .iterate = f2fs_readdir, |
6b4ea016 JK |
874 | .fsync = f2fs_sync_file, |
875 | .unlocked_ioctl = f2fs_ioctl, | |
876 | }; |