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 | { | |
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 | ||
ebfa7322 | 40 | static 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) { | |
0c0b471e | 139 | if (de->hash_code == cpu_to_le32(fname->hash)) |
6e22c691 JK |
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 | ||
5d2b42ed SL |
175 | if(fname->hash) |
176 | namehash = cpu_to_le32(fname->hash); | |
177 | else | |
178 | namehash = f2fs_dentry_hash(&name); | |
6b4ea016 | 179 | |
38431545 | 180 | nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level); |
6b4ea016 JK |
181 | nblock = bucket_blocks(level); |
182 | ||
38431545 JK |
183 | bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level, |
184 | le32_to_cpu(namehash) % nbucket); | |
6b4ea016 JK |
185 | end_block = bidx + nblock; |
186 | ||
187 | for (; bidx < end_block; bidx++) { | |
188 | /* no need to allocate new dentry pages to all the indices */ | |
43f3eae1 | 189 | dentry_page = find_data_page(dir, bidx); |
6b4ea016 | 190 | if (IS_ERR(dentry_page)) { |
42d96401 JK |
191 | if (PTR_ERR(dentry_page) == -ENOENT) { |
192 | room = true; | |
193 | continue; | |
194 | } else { | |
195 | *res_page = dentry_page; | |
196 | break; | |
197 | } | |
6b4ea016 JK |
198 | } |
199 | ||
6e22c691 JK |
200 | de = find_in_block(dentry_page, fname, namehash, &max_slots, |
201 | res_page); | |
6b4ea016 JK |
202 | if (de) |
203 | break; | |
204 | ||
205 | if (max_slots >= s) | |
206 | room = true; | |
207 | f2fs_put_page(dentry_page, 0); | |
208 | } | |
209 | ||
210 | if (!de && room && F2FS_I(dir)->chash != namehash) { | |
211 | F2FS_I(dir)->chash = namehash; | |
212 | F2FS_I(dir)->clevel = level; | |
213 | } | |
214 | ||
215 | return de; | |
216 | } | |
217 | ||
e7ba108a SL |
218 | struct f2fs_dir_entry *__f2fs_find_entry(struct inode *dir, |
219 | struct fscrypt_name *fname, struct page **res_page) | |
6b4ea016 | 220 | { |
6b4ea016 JK |
221 | unsigned long npages = dir_blocks(dir); |
222 | struct f2fs_dir_entry *de = NULL; | |
6b4ea016 JK |
223 | unsigned int max_depth; |
224 | unsigned int level; | |
6e22c691 JK |
225 | |
226 | if (f2fs_has_inline_dentry(dir)) { | |
42d96401 | 227 | *res_page = NULL; |
e7ba108a | 228 | de = find_in_inline_dir(dir, fname, res_page); |
6e22c691 JK |
229 | goto out; |
230 | } | |
622f28ae | 231 | |
42d96401 JK |
232 | if (npages == 0) { |
233 | *res_page = NULL; | |
6e22c691 | 234 | goto out; |
42d96401 | 235 | } |
6b4ea016 | 236 | |
6b4ea016 | 237 | max_depth = F2FS_I(dir)->i_current_depth; |
1f6fa261 JK |
238 | if (unlikely(max_depth > MAX_DIR_HASH_DEPTH)) { |
239 | f2fs_msg(F2FS_I_SB(dir)->sb, KERN_WARNING, | |
240 | "Corrupted max_depth of %lu: %u", | |
241 | dir->i_ino, max_depth); | |
242 | max_depth = MAX_DIR_HASH_DEPTH; | |
205b9822 | 243 | f2fs_i_depth_write(dir, max_depth); |
1f6fa261 | 244 | } |
6b4ea016 JK |
245 | |
246 | for (level = 0; level < max_depth; level++) { | |
42d96401 | 247 | *res_page = NULL; |
e7ba108a | 248 | de = find_in_level(dir, level, fname, res_page); |
42d96401 | 249 | if (de || IS_ERR(*res_page)) |
6b4ea016 JK |
250 | break; |
251 | } | |
6e22c691 | 252 | out: |
e7ba108a SL |
253 | return de; |
254 | } | |
255 | ||
256 | /* | |
257 | * Find an entry in the specified directory with the wanted name. | |
258 | * It returns the page where the entry was found (as a parameter - res_page), | |
259 | * and the entry itself. Page is returned mapped and unlocked. | |
260 | * Entry is guaranteed to be valid. | |
261 | */ | |
262 | struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir, | |
263 | const struct qstr *child, struct page **res_page) | |
264 | { | |
265 | struct f2fs_dir_entry *de = NULL; | |
266 | struct fscrypt_name fname; | |
267 | int err; | |
268 | ||
269 | err = fscrypt_setup_filename(dir, child, 1, &fname); | |
270 | if (err) { | |
271 | *res_page = ERR_PTR(err); | |
272 | return NULL; | |
273 | } | |
274 | ||
275 | de = __f2fs_find_entry(dir, &fname, res_page); | |
276 | ||
0b81d077 | 277 | fscrypt_free_filename(&fname); |
6b4ea016 JK |
278 | return de; |
279 | } | |
280 | ||
281 | struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p) | |
282 | { | |
8be0fea9 | 283 | struct qstr dotdot = QSTR_INIT("..", 2); |
622f28ae | 284 | |
8be0fea9 | 285 | return f2fs_find_entry(dir, &dotdot, p); |
6b4ea016 JK |
286 | } |
287 | ||
835c92d4 | 288 | ino_t f2fs_inode_by_name(struct inode *dir, const struct qstr *qstr, |
91246c21 | 289 | struct page **page) |
6b4ea016 JK |
290 | { |
291 | ino_t res = 0; | |
292 | struct f2fs_dir_entry *de; | |
6b4ea016 | 293 | |
91246c21 | 294 | de = f2fs_find_entry(dir, qstr, page); |
6b4ea016 JK |
295 | if (de) { |
296 | res = le32_to_cpu(de->ino); | |
91246c21 CY |
297 | f2fs_dentry_kunmap(dir, *page); |
298 | f2fs_put_page(*page, 0); | |
6b4ea016 JK |
299 | } |
300 | ||
301 | return res; | |
302 | } | |
303 | ||
304 | void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de, | |
305 | struct page *page, struct inode *inode) | |
306 | { | |
59a06155 | 307 | enum page_type type = f2fs_has_inline_dentry(dir) ? NODE : DATA; |
6b4ea016 | 308 | lock_page(page); |
fec1d657 | 309 | f2fs_wait_on_page_writeback(page, type, true); |
6b4ea016 | 310 | de->ino = cpu_to_le32(inode->i_ino); |
510022a8 | 311 | set_de_type(de, inode->i_mode); |
5df1f1da | 312 | f2fs_dentry_kunmap(dir, page); |
6b4ea016 | 313 | set_page_dirty(page); |
6666e6aa | 314 | |
078cd827 | 315 | dir->i_mtime = dir->i_ctime = current_time(dir); |
b56ab837 | 316 | f2fs_mark_inode_dirty_sync(dir); |
6b4ea016 | 317 | f2fs_put_page(page, 1); |
6b4ea016 JK |
318 | } |
319 | ||
44a83ff6 | 320 | static void init_dent_inode(const struct qstr *name, struct page *ipage) |
6b4ea016 | 321 | { |
58bfaf44 | 322 | struct f2fs_inode *ri; |
6b4ea016 | 323 | |
fec1d657 | 324 | f2fs_wait_on_page_writeback(ipage, NODE, true); |
54b591df | 325 | |
53dc9a67 | 326 | /* copy name info. to this inode page */ |
58bfaf44 JK |
327 | ri = F2FS_INODE(ipage); |
328 | ri->i_namelen = cpu_to_le32(name->len); | |
329 | memcpy(ri->i_name, name->name, name->len); | |
6b4ea016 JK |
330 | set_page_dirty(ipage); |
331 | } | |
332 | ||
e7d55452 JK |
333 | int update_dent_inode(struct inode *inode, struct inode *to, |
334 | const struct qstr *name) | |
1cd14caf | 335 | { |
1cd14caf JK |
336 | struct page *page; |
337 | ||
e7d55452 JK |
338 | if (file_enc_name(to)) |
339 | return 0; | |
340 | ||
4081363f | 341 | page = get_node_page(F2FS_I_SB(inode), inode->i_ino); |
1cd14caf JK |
342 | if (IS_ERR(page)) |
343 | return PTR_ERR(page); | |
344 | ||
345 | init_dent_inode(name, page); | |
346 | f2fs_put_page(page, 1); | |
347 | ||
348 | return 0; | |
349 | } | |
350 | ||
062a3e7b JK |
351 | void do_make_empty_dir(struct inode *inode, struct inode *parent, |
352 | struct f2fs_dentry_ptr *d) | |
353 | { | |
291bf80b CY |
354 | struct qstr dot = QSTR_INIT(".", 1); |
355 | struct qstr dotdot = QSTR_INIT("..", 2); | |
062a3e7b | 356 | |
291bf80b CY |
357 | /* update dirent of "." */ |
358 | f2fs_update_dentry(inode->i_ino, inode->i_mode, d, &dot, 0, 0); | |
062a3e7b | 359 | |
291bf80b CY |
360 | /* update dirent of ".." */ |
361 | f2fs_update_dentry(parent->i_ino, parent->i_mode, d, &dotdot, 0, 1); | |
062a3e7b JK |
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 | 390 | struct page *init_inode_metadata(struct inode *inode, struct inode *dir, |
9421d570 CY |
391 | const struct qstr *new_name, const struct qstr *orig_name, |
392 | struct page *dpage) | |
6b4ea016 | 393 | { |
44a83ff6 JK |
394 | struct page *page; |
395 | int err; | |
396 | ||
91942321 | 397 | if (is_inode_flag_set(inode, FI_NEW_INODE)) { |
a014e037 | 398 | page = new_inode_page(inode); |
44a83ff6 JK |
399 | if (IS_ERR(page)) |
400 | return page; | |
6b4ea016 JK |
401 | |
402 | if (S_ISDIR(inode->i_mode)) { | |
221149c0 JK |
403 | /* in order to handle error case */ |
404 | get_page(page); | |
44a83ff6 | 405 | err = make_empty_dir(inode, dir, page); |
221149c0 JK |
406 | if (err) { |
407 | lock_page(page); | |
408 | goto put_error; | |
409 | } | |
410 | put_page(page); | |
6b4ea016 JK |
411 | } |
412 | ||
bce8d112 | 413 | err = f2fs_init_acl(inode, dir, page, dpage); |
44a83ff6 | 414 | if (err) |
a8865372 | 415 | goto put_error; |
44a83ff6 | 416 | |
9421d570 | 417 | err = f2fs_init_security(inode, dir, orig_name, page); |
8ae8f162 | 418 | if (err) |
a8865372 | 419 | goto put_error; |
fcc85a4d JK |
420 | |
421 | if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode)) { | |
0b81d077 | 422 | err = fscrypt_inherit_context(dir, inode, page, false); |
fcc85a4d JK |
423 | if (err) |
424 | goto put_error; | |
425 | } | |
6b4ea016 | 426 | } else { |
4081363f | 427 | page = get_node_page(F2FS_I_SB(dir), inode->i_ino); |
44a83ff6 JK |
428 | if (IS_ERR(page)) |
429 | return page; | |
430 | ||
44a83ff6 | 431 | set_cold_node(inode, page); |
6b4ea016 | 432 | } |
44a83ff6 | 433 | |
9421d570 CY |
434 | if (new_name) |
435 | init_dent_inode(new_name, page); | |
44a83ff6 | 436 | |
83d5d6f6 JK |
437 | /* |
438 | * This file should be checkpointed during fsync. | |
439 | * We lost i_pino from now on. | |
440 | */ | |
91942321 | 441 | if (is_inode_flag_set(inode, FI_INC_LINK)) { |
354a3399 | 442 | file_lost_pino(inode); |
50732df0 CY |
443 | /* |
444 | * If link the tmpfile to alias through linkat path, | |
445 | * we should remove this inode from orphan list. | |
446 | */ | |
447 | if (inode->i_nlink == 0) | |
4081363f | 448 | remove_orphan_inode(F2FS_I_SB(dir), inode->i_ino); |
a1961246 | 449 | f2fs_i_links_write(inode, true); |
6b4ea016 | 450 | } |
44a83ff6 JK |
451 | return page; |
452 | ||
a8865372 | 453 | put_error: |
221149c0 JK |
454 | clear_nlink(inode); |
455 | update_inode(inode, page); | |
456 | f2fs_put_page(page, 1); | |
44a83ff6 | 457 | return ERR_PTR(err); |
6b4ea016 JK |
458 | } |
459 | ||
dbeacf02 | 460 | void update_parent_metadata(struct inode *dir, struct inode *inode, |
6b4ea016 JK |
461 | unsigned int current_depth) |
462 | { | |
91942321 | 463 | if (inode && is_inode_flag_set(inode, FI_NEW_INODE)) { |
ee6d182f | 464 | if (S_ISDIR(inode->i_mode)) |
a1961246 | 465 | f2fs_i_links_write(dir, true); |
91942321 | 466 | clear_inode_flag(inode, FI_NEW_INODE); |
6b4ea016 | 467 | } |
078cd827 | 468 | dir->i_mtime = dir->i_ctime = current_time(dir); |
b56ab837 | 469 | f2fs_mark_inode_dirty_sync(dir); |
a18ff063 | 470 | |
ee6d182f | 471 | if (F2FS_I(dir)->i_current_depth != current_depth) |
205b9822 | 472 | f2fs_i_depth_write(dir, current_depth); |
6b4ea016 | 473 | |
91942321 JK |
474 | if (inode && is_inode_flag_set(inode, FI_INC_LINK)) |
475 | clear_inode_flag(inode, FI_INC_LINK); | |
6b4ea016 JK |
476 | } |
477 | ||
a82afa20 | 478 | int room_for_filename(const void *bitmap, int slots, int max_slots) |
6b4ea016 JK |
479 | { |
480 | int bit_start = 0; | |
481 | int zero_start, zero_end; | |
482 | next: | |
a82afa20 JK |
483 | zero_start = find_next_zero_bit_le(bitmap, max_slots, bit_start); |
484 | if (zero_start >= max_slots) | |
485 | return max_slots; | |
486 | ||
487 | zero_end = find_next_bit_le(bitmap, max_slots, zero_start); | |
6b4ea016 JK |
488 | if (zero_end - zero_start >= slots) |
489 | return zero_start; | |
490 | ||
491 | bit_start = zero_end + 1; | |
492 | ||
a82afa20 JK |
493 | if (zero_end + 1 >= max_slots) |
494 | return max_slots; | |
6b4ea016 JK |
495 | goto next; |
496 | } | |
497 | ||
510022a8 | 498 | void f2fs_update_dentry(nid_t ino, umode_t mode, struct f2fs_dentry_ptr *d, |
3b4d732a CY |
499 | const struct qstr *name, f2fs_hash_t name_hash, |
500 | unsigned int bit_pos) | |
501 | { | |
502 | struct f2fs_dir_entry *de; | |
503 | int slots = GET_DENTRY_SLOTS(name->len); | |
504 | int i; | |
505 | ||
506 | de = &d->dentry[bit_pos]; | |
507 | de->hash_code = name_hash; | |
508 | de->name_len = cpu_to_le16(name->len); | |
509 | memcpy(d->filename[bit_pos], name->name, name->len); | |
510022a8 JK |
510 | de->ino = cpu_to_le32(ino); |
511 | set_de_type(de, mode); | |
7d9dfa1d | 512 | for (i = 0; i < slots; i++) { |
6bf6b267 | 513 | __set_bit_le(bit_pos + i, (void *)d->bitmap); |
7d9dfa1d JK |
514 | /* avoid wrong garbage data for readdir */ |
515 | if (i) | |
516 | (de + i)->name_len = 0; | |
517 | } | |
3b4d732a CY |
518 | } |
519 | ||
675f10bd | 520 | int f2fs_add_regular_entry(struct inode *dir, const struct qstr *new_name, |
9421d570 | 521 | const struct qstr *orig_name, |
510022a8 | 522 | struct inode *inode, nid_t ino, umode_t mode) |
6b4ea016 JK |
523 | { |
524 | unsigned int bit_pos; | |
525 | unsigned int level; | |
526 | unsigned int current_depth; | |
527 | unsigned long bidx, block; | |
528 | f2fs_hash_t dentry_hash; | |
6b4ea016 | 529 | unsigned int nbucket, nblock; |
6b4ea016 JK |
530 | struct page *dentry_page = NULL; |
531 | struct f2fs_dentry_block *dentry_blk = NULL; | |
3b4d732a | 532 | struct f2fs_dentry_ptr d; |
510022a8 | 533 | struct page *page = NULL; |
675f10bd | 534 | int slots, err = 0; |
622f28ae | 535 | |
6b4ea016 | 536 | level = 0; |
675f10bd CY |
537 | slots = GET_DENTRY_SLOTS(new_name->len); |
538 | dentry_hash = f2fs_dentry_hash(new_name); | |
9ea97163 | 539 | |
6b4ea016 JK |
540 | current_depth = F2FS_I(dir)->i_current_depth; |
541 | if (F2FS_I(dir)->chash == dentry_hash) { | |
542 | level = F2FS_I(dir)->clevel; | |
543 | F2FS_I(dir)->chash = 0; | |
544 | } | |
545 | ||
546 | start: | |
cb78942b | 547 | #ifdef CONFIG_F2FS_FAULT_INJECTION |
1ecc0c5c | 548 | if (time_to_inject(F2FS_I_SB(dir), FAULT_DIR_DEPTH)) |
cb78942b JK |
549 | return -ENOSPC; |
550 | #endif | |
675f10bd CY |
551 | if (unlikely(current_depth == MAX_DIR_HASH_DEPTH)) |
552 | return -ENOSPC; | |
6b4ea016 JK |
553 | |
554 | /* Increase the depth, if required */ | |
555 | if (level == current_depth) | |
556 | ++current_depth; | |
557 | ||
38431545 | 558 | nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level); |
6b4ea016 JK |
559 | nblock = bucket_blocks(level); |
560 | ||
38431545 JK |
561 | bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level, |
562 | (le32_to_cpu(dentry_hash) % nbucket)); | |
6b4ea016 JK |
563 | |
564 | for (block = bidx; block <= (bidx + nblock - 1); block++) { | |
64aa7ed9 | 565 | dentry_page = get_new_data_page(dir, NULL, block, true); |
675f10bd CY |
566 | if (IS_ERR(dentry_page)) |
567 | return PTR_ERR(dentry_page); | |
6b4ea016 JK |
568 | |
569 | dentry_blk = kmap(dentry_page); | |
a82afa20 JK |
570 | bit_pos = room_for_filename(&dentry_blk->dentry_bitmap, |
571 | slots, NR_DENTRY_IN_BLOCK); | |
6b4ea016 JK |
572 | if (bit_pos < NR_DENTRY_IN_BLOCK) |
573 | goto add_dentry; | |
574 | ||
575 | kunmap(dentry_page); | |
576 | f2fs_put_page(dentry_page, 1); | |
6b4ea016 JK |
577 | } |
578 | ||
579 | /* Move to next level to find the empty slot for new dentry */ | |
580 | ++level; | |
581 | goto start; | |
582 | add_dentry: | |
fec1d657 | 583 | f2fs_wait_on_page_writeback(dentry_page, DATA, true); |
6b4ea016 | 584 | |
510022a8 JK |
585 | if (inode) { |
586 | down_write(&F2FS_I(inode)->i_sem); | |
9421d570 CY |
587 | page = init_inode_metadata(inode, dir, new_name, |
588 | orig_name, NULL); | |
510022a8 JK |
589 | if (IS_ERR(page)) { |
590 | err = PTR_ERR(page); | |
591 | goto fail; | |
592 | } | |
e7d55452 JK |
593 | if (f2fs_encrypted_inode(dir)) |
594 | file_set_enc_name(inode); | |
44a83ff6 | 595 | } |
3b4d732a | 596 | |
d8c6822a | 597 | make_dentry_ptr(NULL, &d, (void *)dentry_blk, 1); |
675f10bd | 598 | f2fs_update_dentry(ino, mode, &d, new_name, dentry_hash, bit_pos); |
3b4d732a | 599 | |
6b4ea016 | 600 | set_page_dirty(dentry_page); |
6666e6aa | 601 | |
510022a8 | 602 | if (inode) { |
205b9822 | 603 | f2fs_i_pino_write(inode, dir->i_ino); |
510022a8 JK |
604 | f2fs_put_page(page, 1); |
605 | } | |
44a83ff6 JK |
606 | |
607 | update_parent_metadata(dir, inode, current_depth); | |
6b4ea016 | 608 | fail: |
510022a8 JK |
609 | if (inode) |
610 | up_write(&F2FS_I(inode)->i_sem); | |
d928bfbf | 611 | |
6b4ea016 JK |
612 | kunmap(dentry_page); |
613 | f2fs_put_page(dentry_page, 1); | |
675f10bd CY |
614 | |
615 | return err; | |
616 | } | |
617 | ||
e7ba108a SL |
618 | int __f2fs_do_add_link(struct inode *dir, struct fscrypt_name *fname, |
619 | struct inode *inode, nid_t ino, umode_t mode) | |
620 | { | |
621 | struct qstr new_name; | |
622 | int err = -EAGAIN; | |
623 | ||
624 | new_name.name = fname_name(fname); | |
625 | new_name.len = fname_len(fname); | |
626 | ||
627 | if (f2fs_has_inline_dentry(dir)) | |
628 | err = f2fs_add_inline_entry(dir, &new_name, fname->usr_fname, | |
629 | inode, ino, mode); | |
630 | if (err == -EAGAIN) | |
631 | err = f2fs_add_regular_entry(dir, &new_name, fname->usr_fname, | |
632 | inode, ino, mode); | |
633 | ||
634 | f2fs_update_time(F2FS_I_SB(dir), REQ_TIME); | |
635 | return err; | |
636 | } | |
637 | ||
675f10bd CY |
638 | /* |
639 | * Caller should grab and release a rwsem by calling f2fs_lock_op() and | |
640 | * f2fs_unlock_op(). | |
641 | */ | |
642 | int __f2fs_add_link(struct inode *dir, const struct qstr *name, | |
643 | struct inode *inode, nid_t ino, umode_t mode) | |
644 | { | |
645 | struct fscrypt_name fname; | |
675f10bd CY |
646 | int err; |
647 | ||
648 | err = fscrypt_setup_filename(dir, name, 0, &fname); | |
649 | if (err) | |
650 | return err; | |
651 | ||
e7ba108a | 652 | err = __f2fs_do_add_link(dir, &fname, inode, ino, mode); |
675f10bd | 653 | |
0b81d077 | 654 | fscrypt_free_filename(&fname); |
6b4ea016 JK |
655 | return err; |
656 | } | |
657 | ||
b97a9b5d JK |
658 | int f2fs_do_tmpfile(struct inode *inode, struct inode *dir) |
659 | { | |
660 | struct page *page; | |
661 | int err = 0; | |
662 | ||
663 | down_write(&F2FS_I(inode)->i_sem); | |
9421d570 | 664 | page = init_inode_metadata(inode, dir, NULL, NULL, NULL); |
b97a9b5d JK |
665 | if (IS_ERR(page)) { |
666 | err = PTR_ERR(page); | |
667 | goto fail; | |
668 | } | |
b97a9b5d JK |
669 | f2fs_put_page(page, 1); |
670 | ||
91942321 | 671 | clear_inode_flag(inode, FI_NEW_INODE); |
b97a9b5d JK |
672 | fail: |
673 | up_write(&F2FS_I(inode)->i_sem); | |
d0239e1b | 674 | f2fs_update_time(F2FS_I_SB(inode), REQ_TIME); |
b97a9b5d JK |
675 | return err; |
676 | } | |
677 | ||
9f7c45cc | 678 | void f2fs_drop_nlink(struct inode *dir, struct inode *inode) |
dbeacf02 CY |
679 | { |
680 | struct f2fs_sb_info *sbi = F2FS_I_SB(dir); | |
681 | ||
682 | down_write(&F2FS_I(inode)->i_sem); | |
683 | ||
ee6d182f | 684 | if (S_ISDIR(inode->i_mode)) |
a1961246 | 685 | f2fs_i_links_write(dir, false); |
078cd827 | 686 | inode->i_ctime = current_time(inode); |
dbeacf02 | 687 | |
a1961246 | 688 | f2fs_i_links_write(inode, false); |
dbeacf02 | 689 | if (S_ISDIR(inode->i_mode)) { |
a1961246 | 690 | f2fs_i_links_write(inode, false); |
fc9581c8 | 691 | f2fs_i_size_write(inode, 0); |
dbeacf02 CY |
692 | } |
693 | up_write(&F2FS_I(inode)->i_sem); | |
dbeacf02 CY |
694 | |
695 | if (inode->i_nlink == 0) | |
67c3758d | 696 | add_orphan_inode(inode); |
dbeacf02 CY |
697 | else |
698 | release_orphan_inode(sbi); | |
699 | } | |
700 | ||
0a8165d7 | 701 | /* |
e1c42045 | 702 | * It only removes the dentry from the dentry page, corresponding name |
6b4ea016 JK |
703 | * entry in name page does not need to be touched during deletion. |
704 | */ | |
705 | void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page, | |
dbeacf02 | 706 | struct inode *dir, struct inode *inode) |
6b4ea016 JK |
707 | { |
708 | struct f2fs_dentry_block *dentry_blk; | |
709 | unsigned int bit_pos; | |
457d08ee | 710 | int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len)); |
6b4ea016 JK |
711 | int i; |
712 | ||
d0239e1b JK |
713 | f2fs_update_time(F2FS_I_SB(dir), REQ_TIME); |
714 | ||
622f28ae CY |
715 | if (f2fs_has_inline_dentry(dir)) |
716 | return f2fs_delete_inline_entry(dentry, page, dir, inode); | |
717 | ||
6b4ea016 | 718 | lock_page(page); |
fec1d657 | 719 | f2fs_wait_on_page_writeback(page, DATA, true); |
6b4ea016 | 720 | |
1c3bb978 GZ |
721 | dentry_blk = page_address(page); |
722 | bit_pos = dentry - dentry_blk->dentry; | |
6b4ea016 | 723 | for (i = 0; i < slots; i++) |
1f7732fe | 724 | clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap); |
6b4ea016 JK |
725 | |
726 | /* Let's check and deallocate this dentry page */ | |
727 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
728 | NR_DENTRY_IN_BLOCK, | |
729 | 0); | |
730 | kunmap(page); /* kunmap - pair of f2fs_find_entry */ | |
731 | set_page_dirty(page); | |
732 | ||
078cd827 | 733 | dir->i_ctime = dir->i_mtime = current_time(dir); |
b56ab837 | 734 | f2fs_mark_inode_dirty_sync(dir); |
6b4ea016 | 735 | |
dbeacf02 | 736 | if (inode) |
9f7c45cc | 737 | f2fs_drop_nlink(dir, inode); |
6b4ea016 | 738 | |
206e61be CY |
739 | if (bit_pos == NR_DENTRY_IN_BLOCK && |
740 | !truncate_hole(dir, page->index, page->index + 1)) { | |
6b4ea016 | 741 | clear_page_dirty_for_io(page); |
2bca1e23 | 742 | ClearPagePrivate(page); |
6b4ea016 | 743 | ClearPageUptodate(page); |
a7ffdbe2 | 744 | inode_dec_dirty_pages(dir); |
933439c8 | 745 | remove_dirty_inode(dir); |
6b4ea016 | 746 | } |
508198be | 747 | f2fs_put_page(page, 1); |
6b4ea016 JK |
748 | } |
749 | ||
750 | bool f2fs_empty_dir(struct inode *dir) | |
751 | { | |
752 | unsigned long bidx; | |
753 | struct page *dentry_page; | |
754 | unsigned int bit_pos; | |
dbeacf02 | 755 | struct f2fs_dentry_block *dentry_blk; |
6b4ea016 JK |
756 | unsigned long nblock = dir_blocks(dir); |
757 | ||
622f28ae CY |
758 | if (f2fs_has_inline_dentry(dir)) |
759 | return f2fs_empty_inline_dir(dir); | |
760 | ||
6b4ea016 | 761 | for (bidx = 0; bidx < nblock; bidx++) { |
a56c7c6f | 762 | dentry_page = get_lock_data_page(dir, bidx, false); |
6b4ea016 JK |
763 | if (IS_ERR(dentry_page)) { |
764 | if (PTR_ERR(dentry_page) == -ENOENT) | |
765 | continue; | |
766 | else | |
767 | return false; | |
768 | } | |
769 | ||
1c3bb978 | 770 | dentry_blk = kmap_atomic(dentry_page); |
6b4ea016 JK |
771 | if (bidx == 0) |
772 | bit_pos = 2; | |
773 | else | |
774 | bit_pos = 0; | |
775 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
776 | NR_DENTRY_IN_BLOCK, | |
777 | bit_pos); | |
1c3bb978 | 778 | kunmap_atomic(dentry_blk); |
6b4ea016 JK |
779 | |
780 | f2fs_put_page(dentry_page, 1); | |
781 | ||
782 | if (bit_pos < NR_DENTRY_IN_BLOCK) | |
783 | return false; | |
784 | } | |
785 | return true; | |
786 | } | |
787 | ||
7b3cd7d6 | 788 | bool f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d, |
0b81d077 | 789 | unsigned int start_pos, struct fscrypt_str *fstr) |
38594de7 JK |
790 | { |
791 | unsigned char d_type = DT_UNKNOWN; | |
792 | unsigned int bit_pos; | |
793 | struct f2fs_dir_entry *de = NULL; | |
0b81d077 | 794 | struct fscrypt_str de_name = FSTR_INIT(NULL, 0); |
38594de7 | 795 | |
7b3cd7d6 | 796 | bit_pos = ((unsigned long)ctx->pos % d->max); |
38594de7 | 797 | |
7b3cd7d6 JK |
798 | while (bit_pos < d->max) { |
799 | bit_pos = find_next_bit_le(d->bitmap, d->max, bit_pos); | |
800 | if (bit_pos >= d->max) | |
38594de7 JK |
801 | break; |
802 | ||
7b3cd7d6 | 803 | de = &d->dentry[bit_pos]; |
7d9dfa1d JK |
804 | if (de->name_len == 0) { |
805 | bit_pos++; | |
806 | ctx->pos = start_pos + bit_pos; | |
807 | continue; | |
808 | } | |
809 | ||
675f10bd | 810 | d_type = get_de_type(de); |
d8c6822a | 811 | |
d8c6822a JK |
812 | de_name.name = d->filename[bit_pos]; |
813 | de_name.len = le16_to_cpu(de->name_len); | |
814 | ||
815 | if (f2fs_encrypted_inode(d->inode)) { | |
816 | int save_len = fstr->len; | |
ef1eb3aa | 817 | int err; |
d8c6822a | 818 | |
ef1eb3aa | 819 | err = fscrypt_fname_disk_to_usr(d->inode, |
0b81d077 JK |
820 | (u32)de->hash_code, 0, |
821 | &de_name, fstr); | |
ef1eb3aa | 822 | if (err) |
d8c6822a | 823 | return true; |
569cf187 JK |
824 | |
825 | de_name = *fstr; | |
826 | fstr->len = save_len; | |
d8c6822a JK |
827 | } |
828 | ||
829 | if (!dir_emit(ctx, de_name.name, de_name.len, | |
38594de7 JK |
830 | le32_to_cpu(de->ino), d_type)) |
831 | return true; | |
832 | ||
833 | bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len)); | |
834 | ctx->pos = start_pos + bit_pos; | |
835 | } | |
836 | return false; | |
837 | } | |
838 | ||
6f7f231e | 839 | static int f2fs_readdir(struct file *file, struct dir_context *ctx) |
6b4ea016 | 840 | { |
496ad9aa | 841 | struct inode *inode = file_inode(file); |
6b4ea016 | 842 | unsigned long npages = dir_blocks(inode); |
6b4ea016 | 843 | struct f2fs_dentry_block *dentry_blk = NULL; |
6b4ea016 | 844 | struct page *dentry_page = NULL; |
817202d9 | 845 | struct file_ra_state *ra = &file->f_ra; |
6f7f231e | 846 | unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK); |
7b3cd7d6 | 847 | struct f2fs_dentry_ptr d; |
0b81d077 | 848 | struct fscrypt_str fstr = FSTR_INIT(NULL, 0); |
d8c6822a | 849 | int err = 0; |
6b4ea016 | 850 | |
d8c6822a | 851 | if (f2fs_encrypted_inode(inode)) { |
0b81d077 | 852 | err = fscrypt_get_encryption_info(inode); |
8074bb51 | 853 | if (err && err != -ENOKEY) |
26bf3dc7 JK |
854 | return err; |
855 | ||
0b81d077 | 856 | err = fscrypt_fname_alloc_buffer(inode, F2FS_NAME_LEN, &fstr); |
d8c6822a JK |
857 | if (err < 0) |
858 | return err; | |
859 | } | |
860 | ||
861 | if (f2fs_has_inline_dentry(inode)) { | |
862 | err = f2fs_read_inline_dir(file, ctx, &fstr); | |
863 | goto out; | |
864 | } | |
622f28ae | 865 | |
817202d9 CY |
866 | /* readahead for multi pages of dir */ |
867 | if (npages - n > 1 && !ra_has_index(ra, n)) | |
868 | page_cache_sync_readahead(inode->i_mapping, ra, file, n, | |
869 | min(npages - n, (pgoff_t)MAX_DIR_RA_PAGES)); | |
870 | ||
6c311ec6 | 871 | for (; n < npages; n++) { |
a56c7c6f | 872 | dentry_page = get_lock_data_page(inode, n, false); |
57b62d29 CY |
873 | if (IS_ERR(dentry_page)) { |
874 | err = PTR_ERR(dentry_page); | |
875 | if (err == -ENOENT) | |
876 | continue; | |
877 | else | |
878 | goto out; | |
879 | } | |
6b4ea016 | 880 | |
6b4ea016 | 881 | dentry_blk = kmap(dentry_page); |
99b072bb | 882 | |
d8c6822a | 883 | make_dentry_ptr(inode, &d, (void *)dentry_blk, 1); |
7b3cd7d6 | 884 | |
e9837bc2 CY |
885 | if (f2fs_fill_dentries(ctx, &d, n * NR_DENTRY_IN_BLOCK, &fstr)) { |
886 | kunmap(dentry_page); | |
887 | f2fs_put_page(dentry_page, 1); | |
888 | break; | |
889 | } | |
38594de7 | 890 | |
6f7f231e | 891 | ctx->pos = (n + 1) * NR_DENTRY_IN_BLOCK; |
6b4ea016 JK |
892 | kunmap(dentry_page); |
893 | f2fs_put_page(dentry_page, 1); | |
6b4ea016 | 894 | } |
fe216c7a | 895 | err = 0; |
d8c6822a | 896 | out: |
0b81d077 | 897 | fscrypt_fname_free_buffer(&fstr); |
d8c6822a | 898 | return err; |
6b4ea016 JK |
899 | } |
900 | ||
ed3360ab CY |
901 | static int f2fs_dir_open(struct inode *inode, struct file *filp) |
902 | { | |
903 | if (f2fs_encrypted_inode(inode)) | |
0b81d077 | 904 | return fscrypt_get_encryption_info(inode) ? -EACCES : 0; |
ed3360ab CY |
905 | return 0; |
906 | } | |
907 | ||
6b4ea016 JK |
908 | const struct file_operations f2fs_dir_operations = { |
909 | .llseek = generic_file_llseek, | |
910 | .read = generic_read_dir, | |
e77d0c63 | 911 | .iterate_shared = f2fs_readdir, |
6b4ea016 | 912 | .fsync = f2fs_sync_file, |
ed3360ab | 913 | .open = f2fs_dir_open, |
6b4ea016 | 914 | .unlocked_ioctl = f2fs_ioctl, |
08b95126 | 915 | #ifdef CONFIG_COMPAT |
916 | .compat_ioctl = f2fs_compat_ioctl, | |
917 | #endif | |
6b4ea016 | 918 | }; |