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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 | { | |
09cbfeaf KS |
20 | return ((unsigned long long) (i_size_read(inode) + PAGE_SIZE - 1)) |
21 | >> PAGE_SHIFT; | |
6b4ea016 JK |
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 | ||
6b4ea016 JK |
51 | static unsigned char f2fs_type_by_mode[S_IFMT >> S_SHIFT] = { |
52 | [S_IFREG >> S_SHIFT] = F2FS_FT_REG_FILE, | |
53 | [S_IFDIR >> S_SHIFT] = F2FS_FT_DIR, | |
54 | [S_IFCHR >> S_SHIFT] = F2FS_FT_CHRDEV, | |
55 | [S_IFBLK >> S_SHIFT] = F2FS_FT_BLKDEV, | |
56 | [S_IFIFO >> S_SHIFT] = F2FS_FT_FIFO, | |
57 | [S_IFSOCK >> S_SHIFT] = F2FS_FT_SOCK, | |
58 | [S_IFLNK >> S_SHIFT] = F2FS_FT_SYMLINK, | |
59 | }; | |
60 | ||
510022a8 | 61 | void set_de_type(struct f2fs_dir_entry *de, umode_t mode) |
6b4ea016 | 62 | { |
6b4ea016 JK |
63 | de->file_type = f2fs_type_by_mode[(mode & S_IFMT) >> S_SHIFT]; |
64 | } | |
65 | ||
675f10bd CY |
66 | unsigned char get_de_type(struct f2fs_dir_entry *de) |
67 | { | |
68 | if (de->file_type < F2FS_FT_MAX) | |
69 | return f2fs_filetype_table[de->file_type]; | |
70 | return DT_UNKNOWN; | |
71 | } | |
72 | ||
38431545 JK |
73 | static unsigned long dir_block_index(unsigned int level, |
74 | int dir_level, unsigned int idx) | |
6b4ea016 JK |
75 | { |
76 | unsigned long i; | |
77 | unsigned long bidx = 0; | |
78 | ||
79 | for (i = 0; i < level; i++) | |
38431545 | 80 | bidx += dir_buckets(i, dir_level) * bucket_blocks(i); |
6b4ea016 JK |
81 | bidx += idx * bucket_blocks(level); |
82 | return bidx; | |
83 | } | |
84 | ||
6b4ea016 | 85 | static struct f2fs_dir_entry *find_in_block(struct page *dentry_page, |
0b81d077 | 86 | struct fscrypt_name *fname, |
6e22c691 JK |
87 | f2fs_hash_t namehash, |
88 | int *max_slots, | |
4e6ebf6d JK |
89 | struct page **res_page) |
90 | { | |
91 | struct f2fs_dentry_block *dentry_blk; | |
92 | struct f2fs_dir_entry *de; | |
7b3cd7d6 | 93 | struct f2fs_dentry_ptr d; |
4e6ebf6d JK |
94 | |
95 | dentry_blk = (struct f2fs_dentry_block *)kmap(dentry_page); | |
7b3cd7d6 | 96 | |
d8c6822a | 97 | make_dentry_ptr(NULL, &d, (void *)dentry_blk, 1); |
6e22c691 | 98 | de = find_target_dentry(fname, namehash, max_slots, &d); |
4e6ebf6d JK |
99 | if (de) |
100 | *res_page = dentry_page; | |
101 | else | |
102 | kunmap(dentry_page); | |
103 | ||
4e6ebf6d JK |
104 | return de; |
105 | } | |
106 | ||
0b81d077 | 107 | struct f2fs_dir_entry *find_target_dentry(struct fscrypt_name *fname, |
6e22c691 JK |
108 | f2fs_hash_t namehash, int *max_slots, |
109 | struct f2fs_dentry_ptr *d) | |
6b4ea016 JK |
110 | { |
111 | struct f2fs_dir_entry *de; | |
5d0c6671 | 112 | unsigned long bit_pos = 0; |
5d0c6671 | 113 | int max_len = 0; |
0b81d077 JK |
114 | struct fscrypt_str de_name = FSTR_INIT(NULL, 0); |
115 | struct fscrypt_str *name = &fname->disk_name; | |
6b4ea016 | 116 | |
7b3cd7d6 JK |
117 | if (max_slots) |
118 | *max_slots = 0; | |
119 | while (bit_pos < d->max) { | |
120 | if (!test_bit_le(bit_pos, d->bitmap)) { | |
5d0c6671 | 121 | bit_pos++; |
bda19076 | 122 | max_len++; |
5d0c6671 JK |
123 | continue; |
124 | } | |
bda19076 | 125 | |
7b3cd7d6 | 126 | de = &d->dentry[bit_pos]; |
6e22c691 | 127 | |
a4a13f58 CY |
128 | if (unlikely(!de->name_len)) { |
129 | bit_pos++; | |
130 | continue; | |
131 | } | |
132 | ||
6e22c691 JK |
133 | /* encrypted case */ |
134 | de_name.name = d->filename[bit_pos]; | |
135 | de_name.len = le16_to_cpu(de->name_len); | |
136 | ||
137 | /* show encrypted name */ | |
138 | if (fname->hash) { | |
139 | if (de->hash_code == fname->hash) | |
140 | goto found; | |
141 | } else if (de_name.len == name->len && | |
142 | de->hash_code == namehash && | |
143 | !memcmp(de_name.name, name->name, name->len)) | |
4e6ebf6d JK |
144 | goto found; |
145 | ||
bda19076 | 146 | if (max_slots && max_len > *max_slots) |
5d0c6671 | 147 | *max_slots = max_len; |
bda19076 | 148 | max_len = 0; |
81e366f8 | 149 | |
5d0c6671 | 150 | bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len)); |
6b4ea016 JK |
151 | } |
152 | ||
153 | de = NULL; | |
6b4ea016 | 154 | found: |
7b3cd7d6 | 155 | if (max_slots && max_len > *max_slots) |
5d0c6671 | 156 | *max_slots = max_len; |
6b4ea016 JK |
157 | return de; |
158 | } | |
159 | ||
160 | static struct f2fs_dir_entry *find_in_level(struct inode *dir, | |
6e22c691 | 161 | unsigned int level, |
0b81d077 | 162 | struct fscrypt_name *fname, |
6e22c691 | 163 | struct page **res_page) |
6b4ea016 | 164 | { |
6e22c691 JK |
165 | struct qstr name = FSTR_TO_QSTR(&fname->disk_name); |
166 | int s = GET_DENTRY_SLOTS(name.len); | |
6b4ea016 JK |
167 | unsigned int nbucket, nblock; |
168 | unsigned int bidx, end_block; | |
169 | struct page *dentry_page; | |
170 | struct f2fs_dir_entry *de = NULL; | |
171 | bool room = false; | |
4e6ebf6d | 172 | int max_slots; |
6e22c691 JK |
173 | f2fs_hash_t namehash; |
174 | ||
175 | namehash = f2fs_dentry_hash(&name); | |
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; | |
0b81d077 | 223 | struct fscrypt_name fname; |
6e22c691 | 224 | int err; |
6b4ea016 | 225 | |
b1f73b79 YZ |
226 | *res_page = NULL; |
227 | ||
0b81d077 | 228 | err = fscrypt_setup_filename(dir, child, 1, &fname); |
6e22c691 JK |
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 | 240 | max_depth = F2FS_I(dir)->i_current_depth; |
1f6fa261 JK |
241 | if (unlikely(max_depth > MAX_DIR_HASH_DEPTH)) { |
242 | f2fs_msg(F2FS_I_SB(dir)->sb, KERN_WARNING, | |
243 | "Corrupted max_depth of %lu: %u", | |
244 | dir->i_ino, max_depth); | |
245 | max_depth = MAX_DIR_HASH_DEPTH; | |
246 | F2FS_I(dir)->i_current_depth = max_depth; | |
247 | mark_inode_dirty(dir); | |
248 | } | |
6b4ea016 JK |
249 | |
250 | for (level = 0; level < max_depth; level++) { | |
6e22c691 | 251 | de = find_in_level(dir, level, &fname, res_page); |
6b4ea016 JK |
252 | if (de) |
253 | break; | |
254 | } | |
6e22c691 | 255 | out: |
0b81d077 | 256 | fscrypt_free_filename(&fname); |
6b4ea016 JK |
257 | return de; |
258 | } | |
259 | ||
260 | struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p) | |
261 | { | |
4777f86b NJ |
262 | struct page *page; |
263 | struct f2fs_dir_entry *de; | |
264 | struct f2fs_dentry_block *dentry_blk; | |
6b4ea016 | 265 | |
622f28ae CY |
266 | if (f2fs_has_inline_dentry(dir)) |
267 | return f2fs_parent_inline_dir(dir, p); | |
268 | ||
a56c7c6f | 269 | page = get_lock_data_page(dir, 0, false); |
6b4ea016 JK |
270 | if (IS_ERR(page)) |
271 | return NULL; | |
272 | ||
273 | dentry_blk = kmap(page); | |
274 | de = &dentry_blk->dentry[1]; | |
275 | *p = page; | |
276 | unlock_page(page); | |
277 | return de; | |
278 | } | |
279 | ||
280 | ino_t f2fs_inode_by_name(struct inode *dir, struct qstr *qstr) | |
281 | { | |
282 | ino_t res = 0; | |
283 | struct f2fs_dir_entry *de; | |
284 | struct page *page; | |
285 | ||
286 | de = f2fs_find_entry(dir, qstr, &page); | |
287 | if (de) { | |
288 | res = le32_to_cpu(de->ino); | |
9486ba44 | 289 | f2fs_dentry_kunmap(dir, page); |
6b4ea016 JK |
290 | f2fs_put_page(page, 0); |
291 | } | |
292 | ||
293 | return res; | |
294 | } | |
295 | ||
296 | void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de, | |
297 | struct page *page, struct inode *inode) | |
298 | { | |
59a06155 | 299 | enum page_type type = f2fs_has_inline_dentry(dir) ? NODE : DATA; |
6b4ea016 | 300 | lock_page(page); |
fec1d657 | 301 | f2fs_wait_on_page_writeback(page, type, true); |
6b4ea016 | 302 | de->ino = cpu_to_le32(inode->i_ino); |
510022a8 | 303 | set_de_type(de, inode->i_mode); |
5df1f1da | 304 | f2fs_dentry_kunmap(dir, page); |
6b4ea016 JK |
305 | set_page_dirty(page); |
306 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; | |
307 | mark_inode_dirty(dir); | |
6666e6aa | 308 | |
6b4ea016 | 309 | f2fs_put_page(page, 1); |
6b4ea016 JK |
310 | } |
311 | ||
44a83ff6 | 312 | static void init_dent_inode(const struct qstr *name, struct page *ipage) |
6b4ea016 | 313 | { |
58bfaf44 | 314 | struct f2fs_inode *ri; |
6b4ea016 | 315 | |
fec1d657 | 316 | f2fs_wait_on_page_writeback(ipage, NODE, true); |
54b591df | 317 | |
53dc9a67 | 318 | /* copy name info. to this inode page */ |
58bfaf44 JK |
319 | ri = F2FS_INODE(ipage); |
320 | ri->i_namelen = cpu_to_le32(name->len); | |
321 | memcpy(ri->i_name, name->name, name->len); | |
6b4ea016 JK |
322 | set_page_dirty(ipage); |
323 | } | |
324 | ||
e7d55452 JK |
325 | int update_dent_inode(struct inode *inode, struct inode *to, |
326 | const struct qstr *name) | |
1cd14caf | 327 | { |
1cd14caf JK |
328 | struct page *page; |
329 | ||
e7d55452 JK |
330 | if (file_enc_name(to)) |
331 | return 0; | |
332 | ||
4081363f | 333 | page = get_node_page(F2FS_I_SB(inode), inode->i_ino); |
1cd14caf JK |
334 | if (IS_ERR(page)) |
335 | return PTR_ERR(page); | |
336 | ||
337 | init_dent_inode(name, page); | |
338 | f2fs_put_page(page, 1); | |
339 | ||
340 | return 0; | |
341 | } | |
342 | ||
062a3e7b JK |
343 | void do_make_empty_dir(struct inode *inode, struct inode *parent, |
344 | struct f2fs_dentry_ptr *d) | |
345 | { | |
291bf80b CY |
346 | struct qstr dot = QSTR_INIT(".", 1); |
347 | struct qstr dotdot = QSTR_INIT("..", 2); | |
062a3e7b | 348 | |
291bf80b CY |
349 | /* update dirent of "." */ |
350 | f2fs_update_dentry(inode->i_ino, inode->i_mode, d, &dot, 0, 0); | |
062a3e7b | 351 | |
291bf80b CY |
352 | /* update dirent of ".." */ |
353 | f2fs_update_dentry(parent->i_ino, parent->i_mode, d, &dotdot, 0, 1); | |
062a3e7b JK |
354 | } |
355 | ||
44a83ff6 JK |
356 | static int make_empty_dir(struct inode *inode, |
357 | struct inode *parent, struct page *page) | |
39936837 JK |
358 | { |
359 | struct page *dentry_page; | |
360 | struct f2fs_dentry_block *dentry_blk; | |
062a3e7b | 361 | struct f2fs_dentry_ptr d; |
39936837 | 362 | |
622f28ae CY |
363 | if (f2fs_has_inline_dentry(inode)) |
364 | return make_empty_inline_dir(inode, parent, page); | |
365 | ||
44a83ff6 | 366 | dentry_page = get_new_data_page(inode, page, 0, true); |
39936837 JK |
367 | if (IS_ERR(dentry_page)) |
368 | return PTR_ERR(dentry_page); | |
369 | ||
1c3bb978 | 370 | dentry_blk = kmap_atomic(dentry_page); |
39936837 | 371 | |
d8c6822a | 372 | make_dentry_ptr(NULL, &d, (void *)dentry_blk, 1); |
062a3e7b | 373 | do_make_empty_dir(inode, parent, &d); |
39936837 | 374 | |
1c3bb978 | 375 | kunmap_atomic(dentry_blk); |
39936837 JK |
376 | |
377 | set_page_dirty(dentry_page); | |
378 | f2fs_put_page(dentry_page, 1); | |
379 | return 0; | |
380 | } | |
381 | ||
bce8d112 JK |
382 | struct page *init_inode_metadata(struct inode *inode, struct inode *dir, |
383 | const struct qstr *name, struct page *dpage) | |
6b4ea016 | 384 | { |
44a83ff6 JK |
385 | struct page *page; |
386 | int err; | |
387 | ||
b97a9b5d | 388 | if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) { |
a014e037 | 389 | page = new_inode_page(inode); |
44a83ff6 JK |
390 | if (IS_ERR(page)) |
391 | return page; | |
6b4ea016 JK |
392 | |
393 | if (S_ISDIR(inode->i_mode)) { | |
44a83ff6 JK |
394 | err = make_empty_dir(inode, dir, page); |
395 | if (err) | |
396 | goto error; | |
6b4ea016 JK |
397 | } |
398 | ||
bce8d112 | 399 | err = f2fs_init_acl(inode, dir, page, dpage); |
44a83ff6 | 400 | if (err) |
a8865372 | 401 | goto put_error; |
44a83ff6 | 402 | |
8ae8f162 JK |
403 | err = f2fs_init_security(inode, dir, name, page); |
404 | if (err) | |
a8865372 | 405 | goto put_error; |
fcc85a4d JK |
406 | |
407 | if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode)) { | |
0b81d077 | 408 | err = fscrypt_inherit_context(dir, inode, page, false); |
fcc85a4d JK |
409 | if (err) |
410 | goto put_error; | |
411 | } | |
6b4ea016 | 412 | } else { |
4081363f | 413 | page = get_node_page(F2FS_I_SB(dir), inode->i_ino); |
44a83ff6 JK |
414 | if (IS_ERR(page)) |
415 | return page; | |
416 | ||
44a83ff6 | 417 | set_cold_node(inode, page); |
6b4ea016 | 418 | } |
44a83ff6 | 419 | |
b97a9b5d JK |
420 | if (name) |
421 | init_dent_inode(name, page); | |
44a83ff6 | 422 | |
83d5d6f6 JK |
423 | /* |
424 | * This file should be checkpointed during fsync. | |
425 | * We lost i_pino from now on. | |
426 | */ | |
6b4ea016 | 427 | if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) { |
354a3399 | 428 | file_lost_pino(inode); |
50732df0 CY |
429 | /* |
430 | * If link the tmpfile to alias through linkat path, | |
431 | * we should remove this inode from orphan list. | |
432 | */ | |
433 | if (inode->i_nlink == 0) | |
4081363f | 434 | remove_orphan_inode(F2FS_I_SB(dir), inode->i_ino); |
6b4ea016 | 435 | inc_nlink(inode); |
6b4ea016 | 436 | } |
44a83ff6 JK |
437 | return page; |
438 | ||
a8865372 | 439 | put_error: |
44a83ff6 | 440 | f2fs_put_page(page, 1); |
90d72459 | 441 | error: |
bd859c65 JK |
442 | /* once the failed inode becomes a bad inode, i_mode is S_IFREG */ |
443 | truncate_inode_pages(&inode->i_data, 0); | |
764aa3e9 | 444 | truncate_blocks(inode, 0, false); |
c227f912 | 445 | remove_dirty_inode(inode); |
44a83ff6 JK |
446 | remove_inode_page(inode); |
447 | return ERR_PTR(err); | |
6b4ea016 JK |
448 | } |
449 | ||
dbeacf02 | 450 | void update_parent_metadata(struct inode *dir, struct inode *inode, |
6b4ea016 JK |
451 | unsigned int current_depth) |
452 | { | |
510022a8 | 453 | if (inode && is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) { |
6b4ea016 JK |
454 | if (S_ISDIR(inode->i_mode)) { |
455 | inc_nlink(dir); | |
699489bb | 456 | set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR); |
6b4ea016 JK |
457 | } |
458 | clear_inode_flag(F2FS_I(inode), FI_NEW_INODE); | |
459 | } | |
460 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; | |
a18ff063 JK |
461 | mark_inode_dirty(dir); |
462 | ||
6b4ea016 JK |
463 | if (F2FS_I(dir)->i_current_depth != current_depth) { |
464 | F2FS_I(dir)->i_current_depth = current_depth; | |
699489bb | 465 | set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR); |
6b4ea016 JK |
466 | } |
467 | ||
510022a8 | 468 | if (inode && is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) |
6b4ea016 JK |
469 | clear_inode_flag(F2FS_I(inode), FI_INC_LINK); |
470 | } | |
471 | ||
a82afa20 | 472 | int room_for_filename(const void *bitmap, int slots, int max_slots) |
6b4ea016 JK |
473 | { |
474 | int bit_start = 0; | |
475 | int zero_start, zero_end; | |
476 | next: | |
a82afa20 JK |
477 | zero_start = find_next_zero_bit_le(bitmap, max_slots, bit_start); |
478 | if (zero_start >= max_slots) | |
479 | return max_slots; | |
480 | ||
481 | zero_end = find_next_bit_le(bitmap, max_slots, zero_start); | |
6b4ea016 JK |
482 | if (zero_end - zero_start >= slots) |
483 | return zero_start; | |
484 | ||
485 | bit_start = zero_end + 1; | |
486 | ||
a82afa20 JK |
487 | if (zero_end + 1 >= max_slots) |
488 | return max_slots; | |
6b4ea016 JK |
489 | goto next; |
490 | } | |
491 | ||
510022a8 | 492 | void f2fs_update_dentry(nid_t ino, umode_t mode, struct f2fs_dentry_ptr *d, |
3b4d732a CY |
493 | const struct qstr *name, f2fs_hash_t name_hash, |
494 | unsigned int bit_pos) | |
495 | { | |
496 | struct f2fs_dir_entry *de; | |
497 | int slots = GET_DENTRY_SLOTS(name->len); | |
498 | int i; | |
499 | ||
500 | de = &d->dentry[bit_pos]; | |
501 | de->hash_code = name_hash; | |
502 | de->name_len = cpu_to_le16(name->len); | |
503 | memcpy(d->filename[bit_pos], name->name, name->len); | |
510022a8 JK |
504 | de->ino = cpu_to_le32(ino); |
505 | set_de_type(de, mode); | |
7d9dfa1d | 506 | for (i = 0; i < slots; i++) { |
3b4d732a | 507 | test_and_set_bit_le(bit_pos + i, (void *)d->bitmap); |
7d9dfa1d JK |
508 | /* avoid wrong garbage data for readdir */ |
509 | if (i) | |
510 | (de + i)->name_len = 0; | |
511 | } | |
3b4d732a CY |
512 | } |
513 | ||
675f10bd | 514 | int f2fs_add_regular_entry(struct inode *dir, const struct qstr *new_name, |
510022a8 | 515 | struct inode *inode, nid_t ino, umode_t mode) |
6b4ea016 JK |
516 | { |
517 | unsigned int bit_pos; | |
518 | unsigned int level; | |
519 | unsigned int current_depth; | |
520 | unsigned long bidx, block; | |
521 | f2fs_hash_t dentry_hash; | |
6b4ea016 | 522 | unsigned int nbucket, nblock; |
6b4ea016 JK |
523 | struct page *dentry_page = NULL; |
524 | struct f2fs_dentry_block *dentry_blk = NULL; | |
3b4d732a | 525 | struct f2fs_dentry_ptr d; |
510022a8 | 526 | struct page *page = NULL; |
675f10bd | 527 | int slots, err = 0; |
622f28ae | 528 | |
6b4ea016 | 529 | level = 0; |
675f10bd CY |
530 | slots = GET_DENTRY_SLOTS(new_name->len); |
531 | dentry_hash = f2fs_dentry_hash(new_name); | |
9ea97163 | 532 | |
6b4ea016 JK |
533 | current_depth = F2FS_I(dir)->i_current_depth; |
534 | if (F2FS_I(dir)->chash == dentry_hash) { | |
535 | level = F2FS_I(dir)->clevel; | |
536 | F2FS_I(dir)->chash = 0; | |
537 | } | |
538 | ||
539 | start: | |
675f10bd CY |
540 | if (unlikely(current_depth == MAX_DIR_HASH_DEPTH)) |
541 | return -ENOSPC; | |
6b4ea016 JK |
542 | |
543 | /* Increase the depth, if required */ | |
544 | if (level == current_depth) | |
545 | ++current_depth; | |
546 | ||
38431545 | 547 | nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level); |
6b4ea016 JK |
548 | nblock = bucket_blocks(level); |
549 | ||
38431545 JK |
550 | bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level, |
551 | (le32_to_cpu(dentry_hash) % nbucket)); | |
6b4ea016 JK |
552 | |
553 | for (block = bidx; block <= (bidx + nblock - 1); block++) { | |
64aa7ed9 | 554 | dentry_page = get_new_data_page(dir, NULL, block, true); |
675f10bd CY |
555 | if (IS_ERR(dentry_page)) |
556 | return PTR_ERR(dentry_page); | |
6b4ea016 JK |
557 | |
558 | dentry_blk = kmap(dentry_page); | |
a82afa20 JK |
559 | bit_pos = room_for_filename(&dentry_blk->dentry_bitmap, |
560 | slots, NR_DENTRY_IN_BLOCK); | |
6b4ea016 JK |
561 | if (bit_pos < NR_DENTRY_IN_BLOCK) |
562 | goto add_dentry; | |
563 | ||
564 | kunmap(dentry_page); | |
565 | f2fs_put_page(dentry_page, 1); | |
6b4ea016 JK |
566 | } |
567 | ||
568 | /* Move to next level to find the empty slot for new dentry */ | |
569 | ++level; | |
570 | goto start; | |
571 | add_dentry: | |
fec1d657 | 572 | f2fs_wait_on_page_writeback(dentry_page, DATA, true); |
6b4ea016 | 573 | |
510022a8 JK |
574 | if (inode) { |
575 | down_write(&F2FS_I(inode)->i_sem); | |
675f10bd | 576 | page = init_inode_metadata(inode, dir, new_name, NULL); |
510022a8 JK |
577 | if (IS_ERR(page)) { |
578 | err = PTR_ERR(page); | |
579 | goto fail; | |
580 | } | |
e7d55452 JK |
581 | if (f2fs_encrypted_inode(dir)) |
582 | file_set_enc_name(inode); | |
44a83ff6 | 583 | } |
3b4d732a | 584 | |
d8c6822a | 585 | make_dentry_ptr(NULL, &d, (void *)dentry_blk, 1); |
675f10bd | 586 | f2fs_update_dentry(ino, mode, &d, new_name, dentry_hash, bit_pos); |
3b4d732a | 587 | |
6b4ea016 | 588 | set_page_dirty(dentry_page); |
6666e6aa | 589 | |
510022a8 JK |
590 | if (inode) { |
591 | /* we don't need to mark_inode_dirty now */ | |
592 | F2FS_I(inode)->i_pino = dir->i_ino; | |
593 | update_inode(inode, page); | |
594 | f2fs_put_page(page, 1); | |
595 | } | |
44a83ff6 JK |
596 | |
597 | update_parent_metadata(dir, inode, current_depth); | |
6b4ea016 | 598 | fail: |
510022a8 JK |
599 | if (inode) |
600 | up_write(&F2FS_I(inode)->i_sem); | |
d928bfbf | 601 | |
924a2ddb JK |
602 | if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR)) { |
603 | update_inode_page(dir); | |
604 | clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR); | |
605 | } | |
6b4ea016 JK |
606 | kunmap(dentry_page); |
607 | f2fs_put_page(dentry_page, 1); | |
675f10bd CY |
608 | |
609 | return err; | |
610 | } | |
611 | ||
612 | /* | |
613 | * Caller should grab and release a rwsem by calling f2fs_lock_op() and | |
614 | * f2fs_unlock_op(). | |
615 | */ | |
616 | int __f2fs_add_link(struct inode *dir, const struct qstr *name, | |
617 | struct inode *inode, nid_t ino, umode_t mode) | |
618 | { | |
619 | struct fscrypt_name fname; | |
620 | struct qstr new_name; | |
621 | int err; | |
622 | ||
623 | err = fscrypt_setup_filename(dir, name, 0, &fname); | |
624 | if (err) | |
625 | return err; | |
626 | ||
627 | new_name.name = fname_name(&fname); | |
628 | new_name.len = fname_len(&fname); | |
629 | ||
630 | err = -EAGAIN; | |
631 | if (f2fs_has_inline_dentry(dir)) | |
632 | err = f2fs_add_inline_entry(dir, &new_name, inode, ino, mode); | |
633 | if (err == -EAGAIN) | |
634 | err = f2fs_add_regular_entry(dir, &new_name, inode, ino, mode); | |
635 | ||
0b81d077 | 636 | fscrypt_free_filename(&fname); |
d0239e1b | 637 | f2fs_update_time(F2FS_I_SB(dir), REQ_TIME); |
6b4ea016 JK |
638 | return err; |
639 | } | |
640 | ||
b97a9b5d JK |
641 | int f2fs_do_tmpfile(struct inode *inode, struct inode *dir) |
642 | { | |
643 | struct page *page; | |
644 | int err = 0; | |
645 | ||
646 | down_write(&F2FS_I(inode)->i_sem); | |
bce8d112 | 647 | page = init_inode_metadata(inode, dir, NULL, NULL); |
b97a9b5d JK |
648 | if (IS_ERR(page)) { |
649 | err = PTR_ERR(page); | |
650 | goto fail; | |
651 | } | |
652 | /* we don't need to mark_inode_dirty now */ | |
653 | update_inode(inode, page); | |
654 | f2fs_put_page(page, 1); | |
655 | ||
656 | clear_inode_flag(F2FS_I(inode), FI_NEW_INODE); | |
657 | fail: | |
658 | up_write(&F2FS_I(inode)->i_sem); | |
d0239e1b | 659 | f2fs_update_time(F2FS_I_SB(inode), REQ_TIME); |
b97a9b5d JK |
660 | return err; |
661 | } | |
662 | ||
dbeacf02 CY |
663 | void f2fs_drop_nlink(struct inode *dir, struct inode *inode, struct page *page) |
664 | { | |
665 | struct f2fs_sb_info *sbi = F2FS_I_SB(dir); | |
666 | ||
667 | down_write(&F2FS_I(inode)->i_sem); | |
668 | ||
669 | if (S_ISDIR(inode->i_mode)) { | |
670 | drop_nlink(dir); | |
671 | if (page) | |
672 | update_inode(dir, page); | |
673 | else | |
674 | update_inode_page(dir); | |
675 | } | |
676 | inode->i_ctime = CURRENT_TIME; | |
677 | ||
678 | drop_nlink(inode); | |
679 | if (S_ISDIR(inode->i_mode)) { | |
680 | drop_nlink(inode); | |
681 | i_size_write(inode, 0); | |
682 | } | |
683 | up_write(&F2FS_I(inode)->i_sem); | |
684 | update_inode_page(inode); | |
685 | ||
686 | if (inode->i_nlink == 0) | |
687 | add_orphan_inode(sbi, inode->i_ino); | |
688 | else | |
689 | release_orphan_inode(sbi); | |
690 | } | |
691 | ||
0a8165d7 | 692 | /* |
e1c42045 | 693 | * It only removes the dentry from the dentry page, corresponding name |
6b4ea016 JK |
694 | * entry in name page does not need to be touched during deletion. |
695 | */ | |
696 | void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page, | |
dbeacf02 | 697 | struct inode *dir, struct inode *inode) |
6b4ea016 JK |
698 | { |
699 | struct f2fs_dentry_block *dentry_blk; | |
700 | unsigned int bit_pos; | |
457d08ee | 701 | int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len)); |
6b4ea016 JK |
702 | int i; |
703 | ||
d0239e1b JK |
704 | f2fs_update_time(F2FS_I_SB(dir), REQ_TIME); |
705 | ||
622f28ae CY |
706 | if (f2fs_has_inline_dentry(dir)) |
707 | return f2fs_delete_inline_entry(dentry, page, dir, inode); | |
708 | ||
6b4ea016 | 709 | lock_page(page); |
fec1d657 | 710 | f2fs_wait_on_page_writeback(page, DATA, true); |
6b4ea016 | 711 | |
1c3bb978 GZ |
712 | dentry_blk = page_address(page); |
713 | bit_pos = dentry - dentry_blk->dentry; | |
6b4ea016 | 714 | for (i = 0; i < slots; i++) |
1f7732fe | 715 | clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap); |
6b4ea016 JK |
716 | |
717 | /* Let's check and deallocate this dentry page */ | |
718 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
719 | NR_DENTRY_IN_BLOCK, | |
720 | 0); | |
721 | kunmap(page); /* kunmap - pair of f2fs_find_entry */ | |
722 | set_page_dirty(page); | |
723 | ||
724 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; | |
725 | ||
dbeacf02 CY |
726 | if (inode) |
727 | f2fs_drop_nlink(dir, inode, NULL); | |
6b4ea016 | 728 | |
206e61be CY |
729 | if (bit_pos == NR_DENTRY_IN_BLOCK && |
730 | !truncate_hole(dir, page->index, page->index + 1)) { | |
6b4ea016 | 731 | clear_page_dirty_for_io(page); |
2bca1e23 | 732 | ClearPagePrivate(page); |
6b4ea016 | 733 | ClearPageUptodate(page); |
a7ffdbe2 | 734 | inode_dec_dirty_pages(dir); |
6b4ea016 | 735 | } |
508198be | 736 | f2fs_put_page(page, 1); |
6b4ea016 JK |
737 | } |
738 | ||
739 | bool f2fs_empty_dir(struct inode *dir) | |
740 | { | |
741 | unsigned long bidx; | |
742 | struct page *dentry_page; | |
743 | unsigned int bit_pos; | |
dbeacf02 | 744 | struct f2fs_dentry_block *dentry_blk; |
6b4ea016 JK |
745 | unsigned long nblock = dir_blocks(dir); |
746 | ||
622f28ae CY |
747 | if (f2fs_has_inline_dentry(dir)) |
748 | return f2fs_empty_inline_dir(dir); | |
749 | ||
6b4ea016 | 750 | for (bidx = 0; bidx < nblock; bidx++) { |
a56c7c6f | 751 | dentry_page = get_lock_data_page(dir, bidx, false); |
6b4ea016 JK |
752 | if (IS_ERR(dentry_page)) { |
753 | if (PTR_ERR(dentry_page) == -ENOENT) | |
754 | continue; | |
755 | else | |
756 | return false; | |
757 | } | |
758 | ||
1c3bb978 | 759 | dentry_blk = kmap_atomic(dentry_page); |
6b4ea016 JK |
760 | if (bidx == 0) |
761 | bit_pos = 2; | |
762 | else | |
763 | bit_pos = 0; | |
764 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
765 | NR_DENTRY_IN_BLOCK, | |
766 | bit_pos); | |
1c3bb978 | 767 | kunmap_atomic(dentry_blk); |
6b4ea016 JK |
768 | |
769 | f2fs_put_page(dentry_page, 1); | |
770 | ||
771 | if (bit_pos < NR_DENTRY_IN_BLOCK) | |
772 | return false; | |
773 | } | |
774 | return true; | |
775 | } | |
776 | ||
7b3cd7d6 | 777 | bool f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d, |
0b81d077 | 778 | unsigned int start_pos, struct fscrypt_str *fstr) |
38594de7 JK |
779 | { |
780 | unsigned char d_type = DT_UNKNOWN; | |
781 | unsigned int bit_pos; | |
782 | struct f2fs_dir_entry *de = NULL; | |
0b81d077 | 783 | struct fscrypt_str de_name = FSTR_INIT(NULL, 0); |
38594de7 | 784 | |
7b3cd7d6 | 785 | bit_pos = ((unsigned long)ctx->pos % d->max); |
38594de7 | 786 | |
7b3cd7d6 JK |
787 | while (bit_pos < d->max) { |
788 | bit_pos = find_next_bit_le(d->bitmap, d->max, bit_pos); | |
789 | if (bit_pos >= d->max) | |
38594de7 JK |
790 | break; |
791 | ||
7b3cd7d6 | 792 | de = &d->dentry[bit_pos]; |
7d9dfa1d JK |
793 | if (de->name_len == 0) { |
794 | bit_pos++; | |
795 | ctx->pos = start_pos + bit_pos; | |
796 | continue; | |
797 | } | |
798 | ||
675f10bd | 799 | d_type = get_de_type(de); |
d8c6822a | 800 | |
d8c6822a JK |
801 | de_name.name = d->filename[bit_pos]; |
802 | de_name.len = le16_to_cpu(de->name_len); | |
803 | ||
804 | if (f2fs_encrypted_inode(d->inode)) { | |
805 | int save_len = fstr->len; | |
806 | int ret; | |
807 | ||
569cf187 JK |
808 | de_name.name = kmalloc(de_name.len, GFP_NOFS); |
809 | if (!de_name.name) | |
810 | return false; | |
811 | ||
812 | memcpy(de_name.name, d->filename[bit_pos], de_name.len); | |
813 | ||
0b81d077 JK |
814 | ret = fscrypt_fname_disk_to_usr(d->inode, |
815 | (u32)de->hash_code, 0, | |
816 | &de_name, fstr); | |
569cf187 | 817 | kfree(de_name.name); |
d8c6822a JK |
818 | if (ret < 0) |
819 | return true; | |
569cf187 JK |
820 | |
821 | de_name = *fstr; | |
822 | fstr->len = save_len; | |
d8c6822a JK |
823 | } |
824 | ||
825 | if (!dir_emit(ctx, de_name.name, de_name.len, | |
38594de7 JK |
826 | le32_to_cpu(de->ino), d_type)) |
827 | return true; | |
828 | ||
829 | bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len)); | |
830 | ctx->pos = start_pos + bit_pos; | |
831 | } | |
832 | return false; | |
833 | } | |
834 | ||
6f7f231e | 835 | static int f2fs_readdir(struct file *file, struct dir_context *ctx) |
6b4ea016 | 836 | { |
496ad9aa | 837 | struct inode *inode = file_inode(file); |
6b4ea016 | 838 | unsigned long npages = dir_blocks(inode); |
6b4ea016 | 839 | struct f2fs_dentry_block *dentry_blk = NULL; |
6b4ea016 | 840 | struct page *dentry_page = NULL; |
817202d9 | 841 | struct file_ra_state *ra = &file->f_ra; |
6f7f231e | 842 | unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK); |
7b3cd7d6 | 843 | struct f2fs_dentry_ptr d; |
0b81d077 | 844 | struct fscrypt_str fstr = FSTR_INIT(NULL, 0); |
d8c6822a | 845 | int err = 0; |
6b4ea016 | 846 | |
d8c6822a | 847 | if (f2fs_encrypted_inode(inode)) { |
0b81d077 | 848 | err = fscrypt_get_encryption_info(inode); |
8074bb51 | 849 | if (err && err != -ENOKEY) |
26bf3dc7 JK |
850 | return err; |
851 | ||
0b81d077 | 852 | err = fscrypt_fname_alloc_buffer(inode, F2FS_NAME_LEN, &fstr); |
d8c6822a JK |
853 | if (err < 0) |
854 | return err; | |
855 | } | |
856 | ||
857 | if (f2fs_has_inline_dentry(inode)) { | |
858 | err = f2fs_read_inline_dir(file, ctx, &fstr); | |
859 | goto out; | |
860 | } | |
622f28ae | 861 | |
817202d9 CY |
862 | /* readahead for multi pages of dir */ |
863 | if (npages - n > 1 && !ra_has_index(ra, n)) | |
864 | page_cache_sync_readahead(inode->i_mapping, ra, file, n, | |
865 | min(npages - n, (pgoff_t)MAX_DIR_RA_PAGES)); | |
866 | ||
6c311ec6 | 867 | for (; n < npages; n++) { |
a56c7c6f | 868 | dentry_page = get_lock_data_page(inode, n, false); |
57b62d29 CY |
869 | if (IS_ERR(dentry_page)) { |
870 | err = PTR_ERR(dentry_page); | |
871 | if (err == -ENOENT) | |
872 | continue; | |
873 | else | |
874 | goto out; | |
875 | } | |
6b4ea016 | 876 | |
6b4ea016 | 877 | dentry_blk = kmap(dentry_page); |
99b072bb | 878 | |
d8c6822a | 879 | make_dentry_ptr(inode, &d, (void *)dentry_blk, 1); |
7b3cd7d6 | 880 | |
e9837bc2 CY |
881 | if (f2fs_fill_dentries(ctx, &d, n * NR_DENTRY_IN_BLOCK, &fstr)) { |
882 | kunmap(dentry_page); | |
883 | f2fs_put_page(dentry_page, 1); | |
884 | break; | |
885 | } | |
38594de7 | 886 | |
6f7f231e | 887 | ctx->pos = (n + 1) * NR_DENTRY_IN_BLOCK; |
6b4ea016 JK |
888 | kunmap(dentry_page); |
889 | f2fs_put_page(dentry_page, 1); | |
6b4ea016 | 890 | } |
d8c6822a | 891 | out: |
0b81d077 | 892 | fscrypt_fname_free_buffer(&fstr); |
d8c6822a | 893 | return err; |
6b4ea016 JK |
894 | } |
895 | ||
ed3360ab CY |
896 | static int f2fs_dir_open(struct inode *inode, struct file *filp) |
897 | { | |
898 | if (f2fs_encrypted_inode(inode)) | |
0b81d077 | 899 | return fscrypt_get_encryption_info(inode) ? -EACCES : 0; |
ed3360ab CY |
900 | return 0; |
901 | } | |
902 | ||
6b4ea016 JK |
903 | const struct file_operations f2fs_dir_operations = { |
904 | .llseek = generic_file_llseek, | |
905 | .read = generic_read_dir, | |
6f7f231e | 906 | .iterate = f2fs_readdir, |
6b4ea016 | 907 | .fsync = f2fs_sync_file, |
ed3360ab | 908 | .open = f2fs_dir_open, |
6b4ea016 | 909 | .unlocked_ioctl = f2fs_ioctl, |
08b95126 | 910 | #ifdef CONFIG_COMPAT |
911 | .compat_ioctl = f2fs_compat_ioctl, | |
912 | #endif | |
6b4ea016 | 913 | }; |