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, |
0b81d077 | 80 | struct fscrypt_name *fname, |
6e22c691 JK |
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 | ||
0b81d077 | 106 | struct f2fs_dir_entry *find_target_dentry(struct fscrypt_name *fname, |
6e22c691 JK |
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; |
0b81d077 JK |
113 | struct fscrypt_str de_name = FSTR_INIT(NULL, 0); |
114 | struct fscrypt_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 | 159 | unsigned int level, |
0b81d077 | 160 | struct fscrypt_name *fname, |
6e22c691 | 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; | |
0b81d077 | 221 | struct fscrypt_name fname; |
6e22c691 | 222 | int err; |
6b4ea016 | 223 | |
b1f73b79 YZ |
224 | *res_page = NULL; |
225 | ||
0b81d077 | 226 | err = fscrypt_setup_filename(dir, child, 1, &fname); |
6e22c691 JK |
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 | 253 | out: |
0b81d077 | 254 | fscrypt_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); |
fec1d657 | 299 | f2fs_wait_on_page_writeback(page, type, true); |
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 | |
fec1d657 | 314 | f2fs_wait_on_page_writeback(ipage, NODE, true); |
54b591df | 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)) { | |
0b81d077 | 416 | err = fscrypt_inherit_context(dir, inode, page, false); |
fcc85a4d JK |
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); | |
7d9dfa1d | 514 | for (i = 0; i < slots; i++) { |
3b4d732a | 515 | test_and_set_bit_le(bit_pos + i, (void *)d->bitmap); |
7d9dfa1d JK |
516 | /* avoid wrong garbage data for readdir */ |
517 | if (i) | |
518 | (de + i)->name_len = 0; | |
519 | } | |
3b4d732a CY |
520 | } |
521 | ||
39936837 | 522 | /* |
4f4124d0 CY |
523 | * Caller should grab and release a rwsem by calling f2fs_lock_op() and |
524 | * f2fs_unlock_op(). | |
39936837 | 525 | */ |
6c311ec6 | 526 | int __f2fs_add_link(struct inode *dir, const struct qstr *name, |
510022a8 | 527 | struct inode *inode, nid_t ino, umode_t mode) |
6b4ea016 JK |
528 | { |
529 | unsigned int bit_pos; | |
530 | unsigned int level; | |
531 | unsigned int current_depth; | |
532 | unsigned long bidx, block; | |
533 | f2fs_hash_t dentry_hash; | |
6b4ea016 | 534 | unsigned int nbucket, nblock; |
6b4ea016 JK |
535 | struct page *dentry_page = NULL; |
536 | struct f2fs_dentry_block *dentry_blk = NULL; | |
3b4d732a | 537 | struct f2fs_dentry_ptr d; |
510022a8 | 538 | struct page *page = NULL; |
0b81d077 | 539 | struct fscrypt_name fname; |
9ea97163 JK |
540 | struct qstr new_name; |
541 | int slots, err; | |
542 | ||
0b81d077 | 543 | err = fscrypt_setup_filename(dir, name, 0, &fname); |
9ea97163 JK |
544 | if (err) |
545 | return err; | |
546 | ||
547 | new_name.name = fname_name(&fname); | |
548 | new_name.len = fname_len(&fname); | |
6b4ea016 | 549 | |
622f28ae | 550 | if (f2fs_has_inline_dentry(dir)) { |
9ea97163 | 551 | err = f2fs_add_inline_entry(dir, &new_name, inode, ino, mode); |
622f28ae | 552 | if (!err || err != -EAGAIN) |
9ea97163 | 553 | goto out; |
622f28ae CY |
554 | else |
555 | err = 0; | |
556 | } | |
557 | ||
6b4ea016 | 558 | level = 0; |
9ea97163 JK |
559 | slots = GET_DENTRY_SLOTS(new_name.len); |
560 | dentry_hash = f2fs_dentry_hash(&new_name); | |
561 | ||
6b4ea016 JK |
562 | current_depth = F2FS_I(dir)->i_current_depth; |
563 | if (F2FS_I(dir)->chash == dentry_hash) { | |
564 | level = F2FS_I(dir)->clevel; | |
565 | F2FS_I(dir)->chash = 0; | |
566 | } | |
567 | ||
568 | start: | |
9ea97163 JK |
569 | if (unlikely(current_depth == MAX_DIR_HASH_DEPTH)) { |
570 | err = -ENOSPC; | |
571 | goto out; | |
572 | } | |
6b4ea016 JK |
573 | |
574 | /* Increase the depth, if required */ | |
575 | if (level == current_depth) | |
576 | ++current_depth; | |
577 | ||
38431545 | 578 | nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level); |
6b4ea016 JK |
579 | nblock = bucket_blocks(level); |
580 | ||
38431545 JK |
581 | bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level, |
582 | (le32_to_cpu(dentry_hash) % nbucket)); | |
6b4ea016 JK |
583 | |
584 | for (block = bidx; block <= (bidx + nblock - 1); block++) { | |
64aa7ed9 | 585 | dentry_page = get_new_data_page(dir, NULL, block, true); |
9ea97163 JK |
586 | if (IS_ERR(dentry_page)) { |
587 | err = PTR_ERR(dentry_page); | |
588 | goto out; | |
589 | } | |
6b4ea016 JK |
590 | |
591 | dentry_blk = kmap(dentry_page); | |
a82afa20 JK |
592 | bit_pos = room_for_filename(&dentry_blk->dentry_bitmap, |
593 | slots, NR_DENTRY_IN_BLOCK); | |
6b4ea016 JK |
594 | if (bit_pos < NR_DENTRY_IN_BLOCK) |
595 | goto add_dentry; | |
596 | ||
597 | kunmap(dentry_page); | |
598 | f2fs_put_page(dentry_page, 1); | |
6b4ea016 JK |
599 | } |
600 | ||
601 | /* Move to next level to find the empty slot for new dentry */ | |
602 | ++level; | |
603 | goto start; | |
604 | add_dentry: | |
fec1d657 | 605 | f2fs_wait_on_page_writeback(dentry_page, DATA, true); |
6b4ea016 | 606 | |
510022a8 JK |
607 | if (inode) { |
608 | down_write(&F2FS_I(inode)->i_sem); | |
9ea97163 | 609 | page = init_inode_metadata(inode, dir, &new_name, NULL); |
510022a8 JK |
610 | if (IS_ERR(page)) { |
611 | err = PTR_ERR(page); | |
612 | goto fail; | |
613 | } | |
e7d55452 JK |
614 | if (f2fs_encrypted_inode(dir)) |
615 | file_set_enc_name(inode); | |
44a83ff6 | 616 | } |
3b4d732a | 617 | |
d8c6822a | 618 | make_dentry_ptr(NULL, &d, (void *)dentry_blk, 1); |
9ea97163 | 619 | f2fs_update_dentry(ino, mode, &d, &new_name, dentry_hash, bit_pos); |
3b4d732a | 620 | |
6b4ea016 | 621 | set_page_dirty(dentry_page); |
6666e6aa | 622 | |
510022a8 JK |
623 | if (inode) { |
624 | /* we don't need to mark_inode_dirty now */ | |
625 | F2FS_I(inode)->i_pino = dir->i_ino; | |
626 | update_inode(inode, page); | |
627 | f2fs_put_page(page, 1); | |
628 | } | |
44a83ff6 JK |
629 | |
630 | update_parent_metadata(dir, inode, current_depth); | |
6b4ea016 | 631 | fail: |
510022a8 JK |
632 | if (inode) |
633 | up_write(&F2FS_I(inode)->i_sem); | |
d928bfbf | 634 | |
924a2ddb JK |
635 | if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR)) { |
636 | update_inode_page(dir); | |
637 | clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR); | |
638 | } | |
6b4ea016 JK |
639 | kunmap(dentry_page); |
640 | f2fs_put_page(dentry_page, 1); | |
9ea97163 | 641 | out: |
0b81d077 | 642 | fscrypt_free_filename(&fname); |
d0239e1b | 643 | f2fs_update_time(F2FS_I_SB(dir), REQ_TIME); |
6b4ea016 JK |
644 | return err; |
645 | } | |
646 | ||
b97a9b5d JK |
647 | int f2fs_do_tmpfile(struct inode *inode, struct inode *dir) |
648 | { | |
649 | struct page *page; | |
650 | int err = 0; | |
651 | ||
652 | down_write(&F2FS_I(inode)->i_sem); | |
bce8d112 | 653 | page = init_inode_metadata(inode, dir, NULL, NULL); |
b97a9b5d JK |
654 | if (IS_ERR(page)) { |
655 | err = PTR_ERR(page); | |
656 | goto fail; | |
657 | } | |
658 | /* we don't need to mark_inode_dirty now */ | |
659 | update_inode(inode, page); | |
660 | f2fs_put_page(page, 1); | |
661 | ||
662 | clear_inode_flag(F2FS_I(inode), FI_NEW_INODE); | |
663 | fail: | |
664 | up_write(&F2FS_I(inode)->i_sem); | |
d0239e1b | 665 | f2fs_update_time(F2FS_I_SB(inode), REQ_TIME); |
b97a9b5d JK |
666 | return err; |
667 | } | |
668 | ||
dbeacf02 CY |
669 | void f2fs_drop_nlink(struct inode *dir, struct inode *inode, struct page *page) |
670 | { | |
671 | struct f2fs_sb_info *sbi = F2FS_I_SB(dir); | |
672 | ||
673 | down_write(&F2FS_I(inode)->i_sem); | |
674 | ||
675 | if (S_ISDIR(inode->i_mode)) { | |
676 | drop_nlink(dir); | |
677 | if (page) | |
678 | update_inode(dir, page); | |
679 | else | |
680 | update_inode_page(dir); | |
681 | } | |
682 | inode->i_ctime = CURRENT_TIME; | |
683 | ||
684 | drop_nlink(inode); | |
685 | if (S_ISDIR(inode->i_mode)) { | |
686 | drop_nlink(inode); | |
687 | i_size_write(inode, 0); | |
688 | } | |
689 | up_write(&F2FS_I(inode)->i_sem); | |
690 | update_inode_page(inode); | |
691 | ||
692 | if (inode->i_nlink == 0) | |
693 | add_orphan_inode(sbi, inode->i_ino); | |
694 | else | |
695 | release_orphan_inode(sbi); | |
696 | } | |
697 | ||
0a8165d7 | 698 | /* |
e1c42045 | 699 | * It only removes the dentry from the dentry page, corresponding name |
6b4ea016 JK |
700 | * entry in name page does not need to be touched during deletion. |
701 | */ | |
702 | void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page, | |
dbeacf02 | 703 | struct inode *dir, struct inode *inode) |
6b4ea016 JK |
704 | { |
705 | struct f2fs_dentry_block *dentry_blk; | |
706 | unsigned int bit_pos; | |
457d08ee | 707 | int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len)); |
6b4ea016 JK |
708 | int i; |
709 | ||
d0239e1b JK |
710 | f2fs_update_time(F2FS_I_SB(dir), REQ_TIME); |
711 | ||
622f28ae CY |
712 | if (f2fs_has_inline_dentry(dir)) |
713 | return f2fs_delete_inline_entry(dentry, page, dir, inode); | |
714 | ||
6b4ea016 | 715 | lock_page(page); |
fec1d657 | 716 | f2fs_wait_on_page_writeback(page, DATA, true); |
6b4ea016 | 717 | |
1c3bb978 GZ |
718 | dentry_blk = page_address(page); |
719 | bit_pos = dentry - dentry_blk->dentry; | |
6b4ea016 | 720 | for (i = 0; i < slots; i++) |
1f7732fe | 721 | clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap); |
6b4ea016 JK |
722 | |
723 | /* Let's check and deallocate this dentry page */ | |
724 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
725 | NR_DENTRY_IN_BLOCK, | |
726 | 0); | |
727 | kunmap(page); /* kunmap - pair of f2fs_find_entry */ | |
728 | set_page_dirty(page); | |
729 | ||
730 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; | |
731 | ||
dbeacf02 CY |
732 | if (inode) |
733 | f2fs_drop_nlink(dir, inode, NULL); | |
6b4ea016 | 734 | |
206e61be CY |
735 | if (bit_pos == NR_DENTRY_IN_BLOCK && |
736 | !truncate_hole(dir, page->index, page->index + 1)) { | |
6b4ea016 | 737 | clear_page_dirty_for_io(page); |
2bca1e23 | 738 | ClearPagePrivate(page); |
6b4ea016 | 739 | ClearPageUptodate(page); |
a7ffdbe2 | 740 | inode_dec_dirty_pages(dir); |
6b4ea016 | 741 | } |
508198be | 742 | f2fs_put_page(page, 1); |
6b4ea016 JK |
743 | } |
744 | ||
745 | bool f2fs_empty_dir(struct inode *dir) | |
746 | { | |
747 | unsigned long bidx; | |
748 | struct page *dentry_page; | |
749 | unsigned int bit_pos; | |
dbeacf02 | 750 | struct f2fs_dentry_block *dentry_blk; |
6b4ea016 JK |
751 | unsigned long nblock = dir_blocks(dir); |
752 | ||
622f28ae CY |
753 | if (f2fs_has_inline_dentry(dir)) |
754 | return f2fs_empty_inline_dir(dir); | |
755 | ||
6b4ea016 | 756 | for (bidx = 0; bidx < nblock; bidx++) { |
a56c7c6f | 757 | dentry_page = get_lock_data_page(dir, bidx, false); |
6b4ea016 JK |
758 | if (IS_ERR(dentry_page)) { |
759 | if (PTR_ERR(dentry_page) == -ENOENT) | |
760 | continue; | |
761 | else | |
762 | return false; | |
763 | } | |
764 | ||
1c3bb978 | 765 | dentry_blk = kmap_atomic(dentry_page); |
6b4ea016 JK |
766 | if (bidx == 0) |
767 | bit_pos = 2; | |
768 | else | |
769 | bit_pos = 0; | |
770 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
771 | NR_DENTRY_IN_BLOCK, | |
772 | bit_pos); | |
1c3bb978 | 773 | kunmap_atomic(dentry_blk); |
6b4ea016 JK |
774 | |
775 | f2fs_put_page(dentry_page, 1); | |
776 | ||
777 | if (bit_pos < NR_DENTRY_IN_BLOCK) | |
778 | return false; | |
779 | } | |
780 | return true; | |
781 | } | |
782 | ||
7b3cd7d6 | 783 | bool f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d, |
0b81d077 | 784 | unsigned int start_pos, struct fscrypt_str *fstr) |
38594de7 JK |
785 | { |
786 | unsigned char d_type = DT_UNKNOWN; | |
787 | unsigned int bit_pos; | |
788 | struct f2fs_dir_entry *de = NULL; | |
0b81d077 | 789 | struct fscrypt_str de_name = FSTR_INIT(NULL, 0); |
38594de7 | 790 | |
7b3cd7d6 | 791 | bit_pos = ((unsigned long)ctx->pos % d->max); |
38594de7 | 792 | |
7b3cd7d6 JK |
793 | while (bit_pos < d->max) { |
794 | bit_pos = find_next_bit_le(d->bitmap, d->max, bit_pos); | |
795 | if (bit_pos >= d->max) | |
38594de7 JK |
796 | break; |
797 | ||
7b3cd7d6 | 798 | de = &d->dentry[bit_pos]; |
7d9dfa1d JK |
799 | if (de->name_len == 0) { |
800 | bit_pos++; | |
801 | ctx->pos = start_pos + bit_pos; | |
802 | continue; | |
803 | } | |
804 | ||
38594de7 JK |
805 | if (de->file_type < F2FS_FT_MAX) |
806 | d_type = f2fs_filetype_table[de->file_type]; | |
807 | else | |
808 | d_type = DT_UNKNOWN; | |
d8c6822a | 809 | |
d8c6822a JK |
810 | de_name.name = d->filename[bit_pos]; |
811 | de_name.len = le16_to_cpu(de->name_len); | |
812 | ||
813 | if (f2fs_encrypted_inode(d->inode)) { | |
814 | int save_len = fstr->len; | |
815 | int ret; | |
816 | ||
569cf187 JK |
817 | de_name.name = kmalloc(de_name.len, GFP_NOFS); |
818 | if (!de_name.name) | |
819 | return false; | |
820 | ||
821 | memcpy(de_name.name, d->filename[bit_pos], de_name.len); | |
822 | ||
0b81d077 JK |
823 | ret = fscrypt_fname_disk_to_usr(d->inode, |
824 | (u32)de->hash_code, 0, | |
825 | &de_name, fstr); | |
569cf187 | 826 | kfree(de_name.name); |
d8c6822a JK |
827 | if (ret < 0) |
828 | return true; | |
569cf187 JK |
829 | |
830 | de_name = *fstr; | |
831 | fstr->len = save_len; | |
d8c6822a JK |
832 | } |
833 | ||
834 | if (!dir_emit(ctx, de_name.name, de_name.len, | |
38594de7 JK |
835 | le32_to_cpu(de->ino), d_type)) |
836 | return true; | |
837 | ||
838 | bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len)); | |
839 | ctx->pos = start_pos + bit_pos; | |
840 | } | |
841 | return false; | |
842 | } | |
843 | ||
6f7f231e | 844 | static int f2fs_readdir(struct file *file, struct dir_context *ctx) |
6b4ea016 | 845 | { |
496ad9aa | 846 | struct inode *inode = file_inode(file); |
6b4ea016 | 847 | unsigned long npages = dir_blocks(inode); |
6b4ea016 | 848 | struct f2fs_dentry_block *dentry_blk = NULL; |
6b4ea016 | 849 | struct page *dentry_page = NULL; |
817202d9 | 850 | struct file_ra_state *ra = &file->f_ra; |
6f7f231e | 851 | unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK); |
7b3cd7d6 | 852 | struct f2fs_dentry_ptr d; |
0b81d077 | 853 | struct fscrypt_str fstr = FSTR_INIT(NULL, 0); |
d8c6822a | 854 | int err = 0; |
6b4ea016 | 855 | |
d8c6822a | 856 | if (f2fs_encrypted_inode(inode)) { |
0b81d077 | 857 | err = fscrypt_get_encryption_info(inode); |
26bf3dc7 JK |
858 | if (err) |
859 | return err; | |
860 | ||
0b81d077 | 861 | err = fscrypt_fname_alloc_buffer(inode, F2FS_NAME_LEN, &fstr); |
d8c6822a JK |
862 | if (err < 0) |
863 | return err; | |
864 | } | |
865 | ||
866 | if (f2fs_has_inline_dentry(inode)) { | |
867 | err = f2fs_read_inline_dir(file, ctx, &fstr); | |
868 | goto out; | |
869 | } | |
622f28ae | 870 | |
817202d9 CY |
871 | /* readahead for multi pages of dir */ |
872 | if (npages - n > 1 && !ra_has_index(ra, n)) | |
873 | page_cache_sync_readahead(inode->i_mapping, ra, file, n, | |
874 | min(npages - n, (pgoff_t)MAX_DIR_RA_PAGES)); | |
875 | ||
6c311ec6 | 876 | for (; n < npages; n++) { |
a56c7c6f | 877 | dentry_page = get_lock_data_page(inode, n, false); |
57b62d29 CY |
878 | if (IS_ERR(dentry_page)) { |
879 | err = PTR_ERR(dentry_page); | |
880 | if (err == -ENOENT) | |
881 | continue; | |
882 | else | |
883 | goto out; | |
884 | } | |
6b4ea016 | 885 | |
6b4ea016 | 886 | dentry_blk = kmap(dentry_page); |
99b072bb | 887 | |
d8c6822a | 888 | make_dentry_ptr(inode, &d, (void *)dentry_blk, 1); |
7b3cd7d6 | 889 | |
e9837bc2 CY |
890 | if (f2fs_fill_dentries(ctx, &d, n * NR_DENTRY_IN_BLOCK, &fstr)) { |
891 | kunmap(dentry_page); | |
892 | f2fs_put_page(dentry_page, 1); | |
893 | break; | |
894 | } | |
38594de7 | 895 | |
6f7f231e | 896 | ctx->pos = (n + 1) * NR_DENTRY_IN_BLOCK; |
6b4ea016 JK |
897 | kunmap(dentry_page); |
898 | f2fs_put_page(dentry_page, 1); | |
6b4ea016 | 899 | } |
d8c6822a | 900 | out: |
0b81d077 | 901 | fscrypt_fname_free_buffer(&fstr); |
d8c6822a | 902 | return err; |
6b4ea016 JK |
903 | } |
904 | ||
ed3360ab CY |
905 | static int f2fs_dir_open(struct inode *inode, struct file *filp) |
906 | { | |
907 | if (f2fs_encrypted_inode(inode)) | |
0b81d077 | 908 | return fscrypt_get_encryption_info(inode) ? -EACCES : 0; |
ed3360ab CY |
909 | return 0; |
910 | } | |
911 | ||
6b4ea016 JK |
912 | const struct file_operations f2fs_dir_operations = { |
913 | .llseek = generic_file_llseek, | |
914 | .read = generic_read_dir, | |
6f7f231e | 915 | .iterate = f2fs_readdir, |
6b4ea016 | 916 | .fsync = f2fs_sync_file, |
ed3360ab | 917 | .open = f2fs_dir_open, |
6b4ea016 | 918 | .unlocked_ioctl = f2fs_ioctl, |
08b95126 | 919 | #ifdef CONFIG_COMPAT |
920 | .compat_ioctl = f2fs_compat_ioctl, | |
921 | #endif | |
6b4ea016 | 922 | }; |