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 | ||
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 | |
38431545 | 175 | nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level); |
6b4ea016 JK |
176 | nblock = bucket_blocks(level); |
177 | ||
38431545 JK |
178 | bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level, |
179 | le32_to_cpu(namehash) % nbucket); | |
6b4ea016 JK |
180 | end_block = bidx + nblock; |
181 | ||
182 | for (; bidx < end_block; bidx++) { | |
183 | /* no need to allocate new dentry pages to all the indices */ | |
43f3eae1 | 184 | dentry_page = find_data_page(dir, bidx); |
6b4ea016 JK |
185 | if (IS_ERR(dentry_page)) { |
186 | room = true; | |
187 | continue; | |
188 | } | |
189 | ||
6e22c691 JK |
190 | de = find_in_block(dentry_page, fname, namehash, &max_slots, |
191 | 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; | |
6b4ea016 JK |
219 | unsigned int max_depth; |
220 | unsigned int level; | |
6e22c691 JK |
221 | struct f2fs_filename fname; |
222 | int err; | |
6b4ea016 | 223 | |
b1f73b79 YZ |
224 | *res_page = NULL; |
225 | ||
6e22c691 JK |
226 | err = f2fs_fname_setup_filename(dir, child, 1, &fname); |
227 | if (err) | |
228 | return NULL; | |
229 | ||
230 | if (f2fs_has_inline_dentry(dir)) { | |
231 | de = find_in_inline_dir(dir, &fname, res_page); | |
232 | goto out; | |
233 | } | |
622f28ae | 234 | |
6b4ea016 | 235 | if (npages == 0) |
6e22c691 | 236 | goto out; |
6b4ea016 | 237 | |
6b4ea016 | 238 | max_depth = F2FS_I(dir)->i_current_depth; |
1f6fa261 JK |
239 | if (unlikely(max_depth > MAX_DIR_HASH_DEPTH)) { |
240 | f2fs_msg(F2FS_I_SB(dir)->sb, KERN_WARNING, | |
241 | "Corrupted max_depth of %lu: %u", | |
242 | dir->i_ino, max_depth); | |
243 | max_depth = MAX_DIR_HASH_DEPTH; | |
244 | F2FS_I(dir)->i_current_depth = max_depth; | |
245 | mark_inode_dirty(dir); | |
246 | } | |
6b4ea016 JK |
247 | |
248 | for (level = 0; level < max_depth; level++) { | |
6e22c691 | 249 | de = find_in_level(dir, level, &fname, res_page); |
6b4ea016 JK |
250 | if (de) |
251 | break; | |
252 | } | |
6e22c691 JK |
253 | out: |
254 | f2fs_fname_free_filename(&fname); | |
6b4ea016 JK |
255 | return de; |
256 | } | |
257 | ||
258 | struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p) | |
259 | { | |
4777f86b NJ |
260 | struct page *page; |
261 | struct f2fs_dir_entry *de; | |
262 | struct f2fs_dentry_block *dentry_blk; | |
6b4ea016 | 263 | |
622f28ae CY |
264 | if (f2fs_has_inline_dentry(dir)) |
265 | return f2fs_parent_inline_dir(dir, p); | |
266 | ||
a56c7c6f | 267 | page = get_lock_data_page(dir, 0, false); |
6b4ea016 JK |
268 | if (IS_ERR(page)) |
269 | return NULL; | |
270 | ||
271 | dentry_blk = kmap(page); | |
272 | de = &dentry_blk->dentry[1]; | |
273 | *p = page; | |
274 | unlock_page(page); | |
275 | return de; | |
276 | } | |
277 | ||
278 | ino_t f2fs_inode_by_name(struct inode *dir, struct qstr *qstr) | |
279 | { | |
280 | ino_t res = 0; | |
281 | struct f2fs_dir_entry *de; | |
282 | struct page *page; | |
283 | ||
284 | de = f2fs_find_entry(dir, qstr, &page); | |
285 | if (de) { | |
286 | res = le32_to_cpu(de->ino); | |
9486ba44 | 287 | f2fs_dentry_kunmap(dir, page); |
6b4ea016 JK |
288 | f2fs_put_page(page, 0); |
289 | } | |
290 | ||
291 | return res; | |
292 | } | |
293 | ||
294 | void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de, | |
295 | struct page *page, struct inode *inode) | |
296 | { | |
59a06155 | 297 | enum page_type type = f2fs_has_inline_dentry(dir) ? NODE : DATA; |
6b4ea016 | 298 | lock_page(page); |
59a06155 | 299 | f2fs_wait_on_page_writeback(page, type); |
6b4ea016 | 300 | de->ino = cpu_to_le32(inode->i_ino); |
510022a8 | 301 | set_de_type(de, inode->i_mode); |
5df1f1da | 302 | f2fs_dentry_kunmap(dir, page); |
6b4ea016 JK |
303 | set_page_dirty(page); |
304 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; | |
305 | mark_inode_dirty(dir); | |
6666e6aa | 306 | |
6b4ea016 | 307 | f2fs_put_page(page, 1); |
6b4ea016 JK |
308 | } |
309 | ||
44a83ff6 | 310 | static void init_dent_inode(const struct qstr *name, struct page *ipage) |
6b4ea016 | 311 | { |
58bfaf44 | 312 | struct f2fs_inode *ri; |
6b4ea016 | 313 | |
54b591df JK |
314 | f2fs_wait_on_page_writeback(ipage, NODE); |
315 | ||
53dc9a67 | 316 | /* copy name info. to this inode page */ |
58bfaf44 JK |
317 | ri = F2FS_INODE(ipage); |
318 | ri->i_namelen = cpu_to_le32(name->len); | |
319 | memcpy(ri->i_name, name->name, name->len); | |
6b4ea016 JK |
320 | set_page_dirty(ipage); |
321 | } | |
322 | ||
e7d55452 JK |
323 | int update_dent_inode(struct inode *inode, struct inode *to, |
324 | const struct qstr *name) | |
1cd14caf | 325 | { |
1cd14caf JK |
326 | struct page *page; |
327 | ||
e7d55452 JK |
328 | if (file_enc_name(to)) |
329 | return 0; | |
330 | ||
4081363f | 331 | page = get_node_page(F2FS_I_SB(inode), inode->i_ino); |
1cd14caf JK |
332 | if (IS_ERR(page)) |
333 | return PTR_ERR(page); | |
334 | ||
335 | init_dent_inode(name, page); | |
336 | f2fs_put_page(page, 1); | |
337 | ||
338 | return 0; | |
339 | } | |
340 | ||
062a3e7b JK |
341 | void do_make_empty_dir(struct inode *inode, struct inode *parent, |
342 | struct f2fs_dentry_ptr *d) | |
343 | { | |
344 | struct f2fs_dir_entry *de; | |
345 | ||
346 | de = &d->dentry[0]; | |
347 | de->name_len = cpu_to_le16(1); | |
348 | de->hash_code = 0; | |
349 | de->ino = cpu_to_le32(inode->i_ino); | |
350 | memcpy(d->filename[0], ".", 1); | |
510022a8 | 351 | set_de_type(de, inode->i_mode); |
062a3e7b JK |
352 | |
353 | de = &d->dentry[1]; | |
354 | de->hash_code = 0; | |
355 | de->name_len = cpu_to_le16(2); | |
356 | de->ino = cpu_to_le32(parent->i_ino); | |
357 | memcpy(d->filename[1], "..", 2); | |
cb58463b | 358 | set_de_type(de, parent->i_mode); |
062a3e7b JK |
359 | |
360 | test_and_set_bit_le(0, (void *)d->bitmap); | |
361 | test_and_set_bit_le(1, (void *)d->bitmap); | |
362 | } | |
363 | ||
44a83ff6 JK |
364 | static int make_empty_dir(struct inode *inode, |
365 | struct inode *parent, struct page *page) | |
39936837 JK |
366 | { |
367 | struct page *dentry_page; | |
368 | struct f2fs_dentry_block *dentry_blk; | |
062a3e7b | 369 | struct f2fs_dentry_ptr d; |
39936837 | 370 | |
622f28ae CY |
371 | if (f2fs_has_inline_dentry(inode)) |
372 | return make_empty_inline_dir(inode, parent, page); | |
373 | ||
44a83ff6 | 374 | dentry_page = get_new_data_page(inode, page, 0, true); |
39936837 JK |
375 | if (IS_ERR(dentry_page)) |
376 | return PTR_ERR(dentry_page); | |
377 | ||
1c3bb978 | 378 | dentry_blk = kmap_atomic(dentry_page); |
39936837 | 379 | |
d8c6822a | 380 | make_dentry_ptr(NULL, &d, (void *)dentry_blk, 1); |
062a3e7b | 381 | do_make_empty_dir(inode, parent, &d); |
39936837 | 382 | |
1c3bb978 | 383 | kunmap_atomic(dentry_blk); |
39936837 JK |
384 | |
385 | set_page_dirty(dentry_page); | |
386 | f2fs_put_page(dentry_page, 1); | |
387 | return 0; | |
388 | } | |
389 | ||
bce8d112 JK |
390 | struct page *init_inode_metadata(struct inode *inode, struct inode *dir, |
391 | const struct qstr *name, struct page *dpage) | |
6b4ea016 | 392 | { |
44a83ff6 JK |
393 | struct page *page; |
394 | int err; | |
395 | ||
b97a9b5d | 396 | if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) { |
a014e037 | 397 | page = new_inode_page(inode); |
44a83ff6 JK |
398 | if (IS_ERR(page)) |
399 | return page; | |
6b4ea016 JK |
400 | |
401 | if (S_ISDIR(inode->i_mode)) { | |
44a83ff6 JK |
402 | err = make_empty_dir(inode, dir, page); |
403 | if (err) | |
404 | goto error; | |
6b4ea016 JK |
405 | } |
406 | ||
bce8d112 | 407 | err = f2fs_init_acl(inode, dir, page, dpage); |
44a83ff6 | 408 | if (err) |
a8865372 | 409 | goto put_error; |
44a83ff6 | 410 | |
8ae8f162 JK |
411 | err = f2fs_init_security(inode, dir, name, page); |
412 | if (err) | |
a8865372 | 413 | goto put_error; |
fcc85a4d JK |
414 | |
415 | if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode)) { | |
416 | err = f2fs_inherit_context(dir, inode, page); | |
417 | if (err) | |
418 | goto put_error; | |
419 | } | |
6b4ea016 | 420 | } else { |
4081363f | 421 | page = get_node_page(F2FS_I_SB(dir), inode->i_ino); |
44a83ff6 JK |
422 | if (IS_ERR(page)) |
423 | return page; | |
424 | ||
44a83ff6 | 425 | set_cold_node(inode, page); |
6b4ea016 | 426 | } |
44a83ff6 | 427 | |
b97a9b5d JK |
428 | if (name) |
429 | init_dent_inode(name, page); | |
44a83ff6 | 430 | |
83d5d6f6 JK |
431 | /* |
432 | * This file should be checkpointed during fsync. | |
433 | * We lost i_pino from now on. | |
434 | */ | |
6b4ea016 | 435 | if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) { |
354a3399 | 436 | file_lost_pino(inode); |
50732df0 CY |
437 | /* |
438 | * If link the tmpfile to alias through linkat path, | |
439 | * we should remove this inode from orphan list. | |
440 | */ | |
441 | if (inode->i_nlink == 0) | |
4081363f | 442 | remove_orphan_inode(F2FS_I_SB(dir), inode->i_ino); |
6b4ea016 | 443 | inc_nlink(inode); |
6b4ea016 | 444 | } |
44a83ff6 JK |
445 | return page; |
446 | ||
a8865372 | 447 | put_error: |
44a83ff6 | 448 | f2fs_put_page(page, 1); |
90d72459 | 449 | error: |
bd859c65 JK |
450 | /* once the failed inode becomes a bad inode, i_mode is S_IFREG */ |
451 | truncate_inode_pages(&inode->i_data, 0); | |
764aa3e9 | 452 | truncate_blocks(inode, 0, false); |
c227f912 | 453 | remove_dirty_inode(inode); |
44a83ff6 JK |
454 | remove_inode_page(inode); |
455 | return ERR_PTR(err); | |
6b4ea016 JK |
456 | } |
457 | ||
dbeacf02 | 458 | void update_parent_metadata(struct inode *dir, struct inode *inode, |
6b4ea016 JK |
459 | unsigned int current_depth) |
460 | { | |
510022a8 | 461 | if (inode && is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) { |
6b4ea016 JK |
462 | if (S_ISDIR(inode->i_mode)) { |
463 | inc_nlink(dir); | |
699489bb | 464 | set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR); |
6b4ea016 JK |
465 | } |
466 | clear_inode_flag(F2FS_I(inode), FI_NEW_INODE); | |
467 | } | |
468 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; | |
a18ff063 JK |
469 | mark_inode_dirty(dir); |
470 | ||
6b4ea016 JK |
471 | if (F2FS_I(dir)->i_current_depth != current_depth) { |
472 | F2FS_I(dir)->i_current_depth = current_depth; | |
699489bb | 473 | set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR); |
6b4ea016 JK |
474 | } |
475 | ||
510022a8 | 476 | if (inode && is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) |
6b4ea016 JK |
477 | clear_inode_flag(F2FS_I(inode), FI_INC_LINK); |
478 | } | |
479 | ||
a82afa20 | 480 | int room_for_filename(const void *bitmap, int slots, int max_slots) |
6b4ea016 JK |
481 | { |
482 | int bit_start = 0; | |
483 | int zero_start, zero_end; | |
484 | next: | |
a82afa20 JK |
485 | zero_start = find_next_zero_bit_le(bitmap, max_slots, bit_start); |
486 | if (zero_start >= max_slots) | |
487 | return max_slots; | |
488 | ||
489 | zero_end = find_next_bit_le(bitmap, max_slots, zero_start); | |
6b4ea016 JK |
490 | if (zero_end - zero_start >= slots) |
491 | return zero_start; | |
492 | ||
493 | bit_start = zero_end + 1; | |
494 | ||
a82afa20 JK |
495 | if (zero_end + 1 >= max_slots) |
496 | return max_slots; | |
6b4ea016 JK |
497 | goto next; |
498 | } | |
499 | ||
510022a8 | 500 | void f2fs_update_dentry(nid_t ino, umode_t mode, struct f2fs_dentry_ptr *d, |
3b4d732a CY |
501 | const struct qstr *name, f2fs_hash_t name_hash, |
502 | unsigned int bit_pos) | |
503 | { | |
504 | struct f2fs_dir_entry *de; | |
505 | int slots = GET_DENTRY_SLOTS(name->len); | |
506 | int i; | |
507 | ||
508 | de = &d->dentry[bit_pos]; | |
509 | de->hash_code = name_hash; | |
510 | de->name_len = cpu_to_le16(name->len); | |
511 | memcpy(d->filename[bit_pos], name->name, name->len); | |
510022a8 JK |
512 | de->ino = cpu_to_le32(ino); |
513 | set_de_type(de, mode); | |
3b4d732a CY |
514 | for (i = 0; i < slots; i++) |
515 | test_and_set_bit_le(bit_pos + i, (void *)d->bitmap); | |
516 | } | |
517 | ||
39936837 | 518 | /* |
4f4124d0 CY |
519 | * Caller should grab and release a rwsem by calling f2fs_lock_op() and |
520 | * f2fs_unlock_op(). | |
39936837 | 521 | */ |
6c311ec6 | 522 | int __f2fs_add_link(struct inode *dir, const struct qstr *name, |
510022a8 | 523 | struct inode *inode, nid_t ino, umode_t mode) |
6b4ea016 JK |
524 | { |
525 | unsigned int bit_pos; | |
526 | unsigned int level; | |
527 | unsigned int current_depth; | |
528 | unsigned long bidx, block; | |
529 | f2fs_hash_t dentry_hash; | |
6b4ea016 | 530 | unsigned int nbucket, nblock; |
6b4ea016 JK |
531 | struct page *dentry_page = NULL; |
532 | struct f2fs_dentry_block *dentry_blk = NULL; | |
3b4d732a | 533 | struct f2fs_dentry_ptr d; |
510022a8 | 534 | struct page *page = NULL; |
9ea97163 JK |
535 | struct f2fs_filename fname; |
536 | struct qstr new_name; | |
537 | int slots, err; | |
538 | ||
539 | err = f2fs_fname_setup_filename(dir, name, 0, &fname); | |
540 | if (err) | |
541 | return err; | |
542 | ||
543 | new_name.name = fname_name(&fname); | |
544 | new_name.len = fname_len(&fname); | |
6b4ea016 | 545 | |
622f28ae | 546 | if (f2fs_has_inline_dentry(dir)) { |
9ea97163 | 547 | err = f2fs_add_inline_entry(dir, &new_name, inode, ino, mode); |
622f28ae | 548 | if (!err || err != -EAGAIN) |
9ea97163 | 549 | goto out; |
622f28ae CY |
550 | else |
551 | err = 0; | |
552 | } | |
553 | ||
6b4ea016 | 554 | level = 0; |
9ea97163 JK |
555 | slots = GET_DENTRY_SLOTS(new_name.len); |
556 | dentry_hash = f2fs_dentry_hash(&new_name); | |
557 | ||
6b4ea016 JK |
558 | current_depth = F2FS_I(dir)->i_current_depth; |
559 | if (F2FS_I(dir)->chash == dentry_hash) { | |
560 | level = F2FS_I(dir)->clevel; | |
561 | F2FS_I(dir)->chash = 0; | |
562 | } | |
563 | ||
564 | start: | |
9ea97163 JK |
565 | if (unlikely(current_depth == MAX_DIR_HASH_DEPTH)) { |
566 | err = -ENOSPC; | |
567 | goto out; | |
568 | } | |
6b4ea016 JK |
569 | |
570 | /* Increase the depth, if required */ | |
571 | if (level == current_depth) | |
572 | ++current_depth; | |
573 | ||
38431545 | 574 | nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level); |
6b4ea016 JK |
575 | nblock = bucket_blocks(level); |
576 | ||
38431545 JK |
577 | bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level, |
578 | (le32_to_cpu(dentry_hash) % nbucket)); | |
6b4ea016 JK |
579 | |
580 | for (block = bidx; block <= (bidx + nblock - 1); block++) { | |
64aa7ed9 | 581 | dentry_page = get_new_data_page(dir, NULL, block, true); |
9ea97163 JK |
582 | if (IS_ERR(dentry_page)) { |
583 | err = PTR_ERR(dentry_page); | |
584 | goto out; | |
585 | } | |
6b4ea016 JK |
586 | |
587 | dentry_blk = kmap(dentry_page); | |
a82afa20 JK |
588 | bit_pos = room_for_filename(&dentry_blk->dentry_bitmap, |
589 | slots, NR_DENTRY_IN_BLOCK); | |
6b4ea016 JK |
590 | if (bit_pos < NR_DENTRY_IN_BLOCK) |
591 | goto add_dentry; | |
592 | ||
593 | kunmap(dentry_page); | |
594 | f2fs_put_page(dentry_page, 1); | |
6b4ea016 JK |
595 | } |
596 | ||
597 | /* Move to next level to find the empty slot for new dentry */ | |
598 | ++level; | |
599 | goto start; | |
600 | add_dentry: | |
3cb5ad15 | 601 | f2fs_wait_on_page_writeback(dentry_page, DATA); |
6b4ea016 | 602 | |
510022a8 JK |
603 | if (inode) { |
604 | down_write(&F2FS_I(inode)->i_sem); | |
9ea97163 | 605 | page = init_inode_metadata(inode, dir, &new_name, NULL); |
510022a8 JK |
606 | if (IS_ERR(page)) { |
607 | err = PTR_ERR(page); | |
608 | goto fail; | |
609 | } | |
e7d55452 JK |
610 | if (f2fs_encrypted_inode(dir)) |
611 | file_set_enc_name(inode); | |
44a83ff6 | 612 | } |
3b4d732a | 613 | |
d8c6822a | 614 | make_dentry_ptr(NULL, &d, (void *)dentry_blk, 1); |
9ea97163 | 615 | f2fs_update_dentry(ino, mode, &d, &new_name, dentry_hash, bit_pos); |
3b4d732a | 616 | |
6b4ea016 | 617 | set_page_dirty(dentry_page); |
6666e6aa | 618 | |
510022a8 JK |
619 | if (inode) { |
620 | /* we don't need to mark_inode_dirty now */ | |
621 | F2FS_I(inode)->i_pino = dir->i_ino; | |
622 | update_inode(inode, page); | |
623 | f2fs_put_page(page, 1); | |
624 | } | |
44a83ff6 JK |
625 | |
626 | update_parent_metadata(dir, inode, current_depth); | |
6b4ea016 | 627 | fail: |
510022a8 JK |
628 | if (inode) |
629 | up_write(&F2FS_I(inode)->i_sem); | |
d928bfbf | 630 | |
924a2ddb JK |
631 | if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR)) { |
632 | update_inode_page(dir); | |
633 | clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR); | |
634 | } | |
6b4ea016 JK |
635 | kunmap(dentry_page); |
636 | f2fs_put_page(dentry_page, 1); | |
9ea97163 JK |
637 | out: |
638 | f2fs_fname_free_filename(&fname); | |
d0239e1b | 639 | f2fs_update_time(F2FS_I_SB(dir), REQ_TIME); |
6b4ea016 JK |
640 | return err; |
641 | } | |
642 | ||
b97a9b5d JK |
643 | int f2fs_do_tmpfile(struct inode *inode, struct inode *dir) |
644 | { | |
645 | struct page *page; | |
646 | int err = 0; | |
647 | ||
648 | down_write(&F2FS_I(inode)->i_sem); | |
bce8d112 | 649 | page = init_inode_metadata(inode, dir, NULL, NULL); |
b97a9b5d JK |
650 | if (IS_ERR(page)) { |
651 | err = PTR_ERR(page); | |
652 | goto fail; | |
653 | } | |
654 | /* we don't need to mark_inode_dirty now */ | |
655 | update_inode(inode, page); | |
656 | f2fs_put_page(page, 1); | |
657 | ||
658 | clear_inode_flag(F2FS_I(inode), FI_NEW_INODE); | |
659 | fail: | |
660 | up_write(&F2FS_I(inode)->i_sem); | |
d0239e1b | 661 | f2fs_update_time(F2FS_I_SB(inode), REQ_TIME); |
b97a9b5d JK |
662 | return err; |
663 | } | |
664 | ||
dbeacf02 CY |
665 | void f2fs_drop_nlink(struct inode *dir, struct inode *inode, struct page *page) |
666 | { | |
667 | struct f2fs_sb_info *sbi = F2FS_I_SB(dir); | |
668 | ||
669 | down_write(&F2FS_I(inode)->i_sem); | |
670 | ||
671 | if (S_ISDIR(inode->i_mode)) { | |
672 | drop_nlink(dir); | |
673 | if (page) | |
674 | update_inode(dir, page); | |
675 | else | |
676 | update_inode_page(dir); | |
677 | } | |
678 | inode->i_ctime = CURRENT_TIME; | |
679 | ||
680 | drop_nlink(inode); | |
681 | if (S_ISDIR(inode->i_mode)) { | |
682 | drop_nlink(inode); | |
683 | i_size_write(inode, 0); | |
684 | } | |
685 | up_write(&F2FS_I(inode)->i_sem); | |
686 | update_inode_page(inode); | |
687 | ||
688 | if (inode->i_nlink == 0) | |
689 | add_orphan_inode(sbi, inode->i_ino); | |
690 | else | |
691 | release_orphan_inode(sbi); | |
692 | } | |
693 | ||
0a8165d7 | 694 | /* |
e1c42045 | 695 | * It only removes the dentry from the dentry page, corresponding name |
6b4ea016 JK |
696 | * entry in name page does not need to be touched during deletion. |
697 | */ | |
698 | void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page, | |
dbeacf02 | 699 | struct inode *dir, struct inode *inode) |
6b4ea016 JK |
700 | { |
701 | struct f2fs_dentry_block *dentry_blk; | |
702 | unsigned int bit_pos; | |
457d08ee | 703 | int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len)); |
6b4ea016 JK |
704 | int i; |
705 | ||
d0239e1b JK |
706 | f2fs_update_time(F2FS_I_SB(dir), REQ_TIME); |
707 | ||
622f28ae CY |
708 | if (f2fs_has_inline_dentry(dir)) |
709 | return f2fs_delete_inline_entry(dentry, page, dir, inode); | |
710 | ||
6b4ea016 | 711 | lock_page(page); |
3cb5ad15 | 712 | f2fs_wait_on_page_writeback(page, DATA); |
6b4ea016 | 713 | |
1c3bb978 GZ |
714 | dentry_blk = page_address(page); |
715 | bit_pos = dentry - dentry_blk->dentry; | |
6b4ea016 | 716 | for (i = 0; i < slots; i++) |
1f7732fe | 717 | clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap); |
6b4ea016 JK |
718 | |
719 | /* Let's check and deallocate this dentry page */ | |
720 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
721 | NR_DENTRY_IN_BLOCK, | |
722 | 0); | |
723 | kunmap(page); /* kunmap - pair of f2fs_find_entry */ | |
724 | set_page_dirty(page); | |
725 | ||
726 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; | |
727 | ||
dbeacf02 CY |
728 | if (inode) |
729 | f2fs_drop_nlink(dir, inode, NULL); | |
6b4ea016 | 730 | |
206e61be CY |
731 | if (bit_pos == NR_DENTRY_IN_BLOCK && |
732 | !truncate_hole(dir, page->index, page->index + 1)) { | |
6b4ea016 | 733 | clear_page_dirty_for_io(page); |
2bca1e23 | 734 | ClearPagePrivate(page); |
6b4ea016 | 735 | ClearPageUptodate(page); |
a7ffdbe2 | 736 | inode_dec_dirty_pages(dir); |
6b4ea016 | 737 | } |
508198be | 738 | f2fs_put_page(page, 1); |
6b4ea016 JK |
739 | } |
740 | ||
741 | bool f2fs_empty_dir(struct inode *dir) | |
742 | { | |
743 | unsigned long bidx; | |
744 | struct page *dentry_page; | |
745 | unsigned int bit_pos; | |
dbeacf02 | 746 | struct f2fs_dentry_block *dentry_blk; |
6b4ea016 JK |
747 | unsigned long nblock = dir_blocks(dir); |
748 | ||
622f28ae CY |
749 | if (f2fs_has_inline_dentry(dir)) |
750 | return f2fs_empty_inline_dir(dir); | |
751 | ||
6b4ea016 | 752 | for (bidx = 0; bidx < nblock; bidx++) { |
a56c7c6f | 753 | dentry_page = get_lock_data_page(dir, bidx, false); |
6b4ea016 JK |
754 | if (IS_ERR(dentry_page)) { |
755 | if (PTR_ERR(dentry_page) == -ENOENT) | |
756 | continue; | |
757 | else | |
758 | return false; | |
759 | } | |
760 | ||
1c3bb978 | 761 | dentry_blk = kmap_atomic(dentry_page); |
6b4ea016 JK |
762 | if (bidx == 0) |
763 | bit_pos = 2; | |
764 | else | |
765 | bit_pos = 0; | |
766 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
767 | NR_DENTRY_IN_BLOCK, | |
768 | bit_pos); | |
1c3bb978 | 769 | kunmap_atomic(dentry_blk); |
6b4ea016 JK |
770 | |
771 | f2fs_put_page(dentry_page, 1); | |
772 | ||
773 | if (bit_pos < NR_DENTRY_IN_BLOCK) | |
774 | return false; | |
775 | } | |
776 | return true; | |
777 | } | |
778 | ||
7b3cd7d6 | 779 | bool f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d, |
d8c6822a | 780 | unsigned int start_pos, struct f2fs_str *fstr) |
38594de7 JK |
781 | { |
782 | unsigned char d_type = DT_UNKNOWN; | |
783 | unsigned int bit_pos; | |
784 | struct f2fs_dir_entry *de = NULL; | |
d8c6822a | 785 | struct f2fs_str de_name = FSTR_INIT(NULL, 0); |
38594de7 | 786 | |
7b3cd7d6 | 787 | bit_pos = ((unsigned long)ctx->pos % d->max); |
38594de7 | 788 | |
7b3cd7d6 JK |
789 | while (bit_pos < d->max) { |
790 | bit_pos = find_next_bit_le(d->bitmap, d->max, bit_pos); | |
791 | if (bit_pos >= d->max) | |
38594de7 JK |
792 | break; |
793 | ||
7b3cd7d6 | 794 | de = &d->dentry[bit_pos]; |
38594de7 JK |
795 | if (de->file_type < F2FS_FT_MAX) |
796 | d_type = f2fs_filetype_table[de->file_type]; | |
797 | else | |
798 | d_type = DT_UNKNOWN; | |
d8c6822a | 799 | |
d8c6822a JK |
800 | de_name.name = d->filename[bit_pos]; |
801 | de_name.len = le16_to_cpu(de->name_len); | |
802 | ||
803 | if (f2fs_encrypted_inode(d->inode)) { | |
804 | int save_len = fstr->len; | |
805 | int ret; | |
806 | ||
569cf187 JK |
807 | de_name.name = kmalloc(de_name.len, GFP_NOFS); |
808 | if (!de_name.name) | |
809 | return false; | |
810 | ||
811 | memcpy(de_name.name, d->filename[bit_pos], de_name.len); | |
812 | ||
d8c6822a JK |
813 | ret = f2fs_fname_disk_to_usr(d->inode, &de->hash_code, |
814 | &de_name, fstr); | |
569cf187 | 815 | kfree(de_name.name); |
d8c6822a JK |
816 | if (ret < 0) |
817 | return true; | |
569cf187 JK |
818 | |
819 | de_name = *fstr; | |
820 | fstr->len = save_len; | |
d8c6822a JK |
821 | } |
822 | ||
823 | if (!dir_emit(ctx, de_name.name, de_name.len, | |
38594de7 JK |
824 | le32_to_cpu(de->ino), d_type)) |
825 | return true; | |
826 | ||
827 | bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len)); | |
828 | ctx->pos = start_pos + bit_pos; | |
829 | } | |
830 | return false; | |
831 | } | |
832 | ||
6f7f231e | 833 | static int f2fs_readdir(struct file *file, struct dir_context *ctx) |
6b4ea016 | 834 | { |
496ad9aa | 835 | struct inode *inode = file_inode(file); |
6b4ea016 | 836 | unsigned long npages = dir_blocks(inode); |
6b4ea016 | 837 | struct f2fs_dentry_block *dentry_blk = NULL; |
6b4ea016 | 838 | struct page *dentry_page = NULL; |
817202d9 | 839 | struct file_ra_state *ra = &file->f_ra; |
6f7f231e | 840 | unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK); |
7b3cd7d6 | 841 | struct f2fs_dentry_ptr d; |
d8c6822a JK |
842 | struct f2fs_str fstr = FSTR_INIT(NULL, 0); |
843 | int err = 0; | |
6b4ea016 | 844 | |
d8c6822a | 845 | if (f2fs_encrypted_inode(inode)) { |
26bf3dc7 JK |
846 | err = f2fs_get_encryption_info(inode); |
847 | if (err) | |
848 | return err; | |
849 | ||
d8c6822a JK |
850 | err = f2fs_fname_crypto_alloc_buffer(inode, F2FS_NAME_LEN, |
851 | &fstr); | |
852 | if (err < 0) | |
853 | return err; | |
854 | } | |
855 | ||
856 | if (f2fs_has_inline_dentry(inode)) { | |
857 | err = f2fs_read_inline_dir(file, ctx, &fstr); | |
858 | goto out; | |
859 | } | |
622f28ae | 860 | |
817202d9 CY |
861 | /* readahead for multi pages of dir */ |
862 | if (npages - n > 1 && !ra_has_index(ra, n)) | |
863 | page_cache_sync_readahead(inode->i_mapping, ra, file, n, | |
864 | min(npages - n, (pgoff_t)MAX_DIR_RA_PAGES)); | |
865 | ||
6c311ec6 | 866 | for (; n < npages; n++) { |
a56c7c6f | 867 | dentry_page = get_lock_data_page(inode, n, false); |
57b62d29 CY |
868 | if (IS_ERR(dentry_page)) { |
869 | err = PTR_ERR(dentry_page); | |
870 | if (err == -ENOENT) | |
871 | continue; | |
872 | else | |
873 | goto out; | |
874 | } | |
6b4ea016 | 875 | |
6b4ea016 | 876 | dentry_blk = kmap(dentry_page); |
99b072bb | 877 | |
d8c6822a | 878 | make_dentry_ptr(inode, &d, (void *)dentry_blk, 1); |
7b3cd7d6 | 879 | |
e9837bc2 CY |
880 | if (f2fs_fill_dentries(ctx, &d, n * NR_DENTRY_IN_BLOCK, &fstr)) { |
881 | kunmap(dentry_page); | |
882 | f2fs_put_page(dentry_page, 1); | |
883 | break; | |
884 | } | |
38594de7 | 885 | |
6f7f231e | 886 | ctx->pos = (n + 1) * NR_DENTRY_IN_BLOCK; |
6b4ea016 JK |
887 | kunmap(dentry_page); |
888 | f2fs_put_page(dentry_page, 1); | |
6b4ea016 | 889 | } |
d8c6822a JK |
890 | out: |
891 | f2fs_fname_crypto_free_buffer(&fstr); | |
892 | return err; | |
6b4ea016 JK |
893 | } |
894 | ||
895 | const struct file_operations f2fs_dir_operations = { | |
896 | .llseek = generic_file_llseek, | |
897 | .read = generic_read_dir, | |
6f7f231e | 898 | .iterate = f2fs_readdir, |
6b4ea016 JK |
899 | .fsync = f2fs_sync_file, |
900 | .unlocked_ioctl = f2fs_ioctl, | |
08b95126 | 901 | #ifdef CONFIG_COMPAT |
902 | .compat_ioctl = f2fs_compat_ioctl, | |
903 | #endif | |
6b4ea016 | 904 | }; |