Commit | Line | Data |
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7c1a000d | 1 | // SPDX-License-Identifier: GPL-2.0 |
0a8165d7 | 2 | /* |
6b4ea016 JK |
3 | * fs/f2fs/dir.c |
4 | * | |
5 | * Copyright (c) 2012 Samsung Electronics Co., Ltd. | |
6 | * http://www.samsung.com/ | |
6b4ea016 | 7 | */ |
7ad08a58 | 8 | #include <asm/unaligned.h> |
6b4ea016 JK |
9 | #include <linux/fs.h> |
10 | #include <linux/f2fs_fs.h> | |
4414dea8 | 11 | #include <linux/sched/signal.h> |
2c2eb7a3 | 12 | #include <linux/unicode.h> |
6b4ea016 | 13 | #include "f2fs.h" |
398b1ac5 | 14 | #include "node.h" |
6b4ea016 | 15 | #include "acl.h" |
8ae8f162 | 16 | #include "xattr.h" |
e97a3c4c | 17 | #include <trace/events/f2fs.h> |
6b4ea016 JK |
18 | |
19 | static unsigned long dir_blocks(struct inode *inode) | |
20 | { | |
09cbfeaf KS |
21 | return ((unsigned long long) (i_size_read(inode) + PAGE_SIZE - 1)) |
22 | >> PAGE_SHIFT; | |
6b4ea016 JK |
23 | } |
24 | ||
38431545 | 25 | static unsigned int dir_buckets(unsigned int level, int dir_level) |
6b4ea016 | 26 | { |
bfec07d0 | 27 | if (level + dir_level < MAX_DIR_HASH_DEPTH / 2) |
38431545 | 28 | return 1 << (level + dir_level); |
6b4ea016 | 29 | else |
bfec07d0 | 30 | return MAX_DIR_BUCKETS; |
6b4ea016 JK |
31 | } |
32 | ||
33 | static unsigned int bucket_blocks(unsigned int level) | |
34 | { | |
35 | if (level < MAX_DIR_HASH_DEPTH / 2) | |
36 | return 2; | |
37 | else | |
38 | return 4; | |
39 | } | |
40 | ||
ebfa7322 | 41 | static unsigned char f2fs_filetype_table[F2FS_FT_MAX] = { |
6b4ea016 JK |
42 | [F2FS_FT_UNKNOWN] = DT_UNKNOWN, |
43 | [F2FS_FT_REG_FILE] = DT_REG, | |
44 | [F2FS_FT_DIR] = DT_DIR, | |
45 | [F2FS_FT_CHRDEV] = DT_CHR, | |
46 | [F2FS_FT_BLKDEV] = DT_BLK, | |
47 | [F2FS_FT_FIFO] = DT_FIFO, | |
48 | [F2FS_FT_SOCK] = DT_SOCK, | |
49 | [F2FS_FT_SYMLINK] = DT_LNK, | |
50 | }; | |
51 | ||
6b4ea016 JK |
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 | ||
2e79d951 | 62 | static 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 | ||
4d57b86d | 67 | unsigned char f2fs_get_de_type(struct f2fs_dir_entry *de) |
675f10bd CY |
68 | { |
69 | if (de->file_type < F2FS_FT_MAX) | |
70 | return f2fs_filetype_table[de->file_type]; | |
71 | return DT_UNKNOWN; | |
72 | } | |
73 | ||
43c780ba EB |
74 | /* If @dir is casefolded, initialize @fname->cf_name from @fname->usr_fname. */ |
75 | int f2fs_init_casefolded_name(const struct inode *dir, | |
76 | struct f2fs_filename *fname) | |
77 | { | |
78 | #ifdef CONFIG_UNICODE | |
eca4873e DR |
79 | struct super_block *sb = dir->i_sb; |
80 | struct f2fs_sb_info *sbi = F2FS_SB(sb); | |
43c780ba EB |
81 | |
82 | if (IS_CASEFOLDED(dir)) { | |
83 | fname->cf_name.name = f2fs_kmalloc(sbi, F2FS_NAME_LEN, | |
84 | GFP_NOFS); | |
85 | if (!fname->cf_name.name) | |
86 | return -ENOMEM; | |
eca4873e | 87 | fname->cf_name.len = utf8_casefold(sb->s_encoding, |
43c780ba EB |
88 | fname->usr_fname, |
89 | fname->cf_name.name, | |
90 | F2FS_NAME_LEN); | |
91 | if ((int)fname->cf_name.len <= 0) { | |
92 | kfree(fname->cf_name.name); | |
93 | fname->cf_name.name = NULL; | |
eca4873e | 94 | if (sb_has_strict_encoding(sb)) |
43c780ba EB |
95 | return -EINVAL; |
96 | /* fall back to treating name as opaque byte sequence */ | |
97 | } | |
98 | } | |
99 | #endif | |
100 | return 0; | |
101 | } | |
102 | ||
103 | static int __f2fs_setup_filename(const struct inode *dir, | |
104 | const struct fscrypt_name *crypt_name, | |
105 | struct f2fs_filename *fname) | |
106 | { | |
107 | int err; | |
108 | ||
109 | memset(fname, 0, sizeof(*fname)); | |
110 | ||
111 | fname->usr_fname = crypt_name->usr_fname; | |
112 | fname->disk_name = crypt_name->disk_name; | |
113 | #ifdef CONFIG_FS_ENCRYPTION | |
114 | fname->crypto_buf = crypt_name->crypto_buf; | |
115 | #endif | |
70fb2612 | 116 | if (crypt_name->is_nokey_name) { |
43c780ba EB |
117 | /* hash was decoded from the no-key name */ |
118 | fname->hash = cpu_to_le32(crypt_name->hash); | |
119 | } else { | |
120 | err = f2fs_init_casefolded_name(dir, fname); | |
121 | if (err) { | |
122 | f2fs_free_filename(fname); | |
123 | return err; | |
124 | } | |
125 | f2fs_hash_filename(dir, fname); | |
126 | } | |
127 | return 0; | |
128 | } | |
129 | ||
130 | /* | |
131 | * Prepare to search for @iname in @dir. This is similar to | |
132 | * fscrypt_setup_filename(), but this also handles computing the casefolded name | |
133 | * and the f2fs dirhash if needed, then packing all the information about this | |
134 | * filename up into a 'struct f2fs_filename'. | |
135 | */ | |
136 | int f2fs_setup_filename(struct inode *dir, const struct qstr *iname, | |
137 | int lookup, struct f2fs_filename *fname) | |
138 | { | |
139 | struct fscrypt_name crypt_name; | |
140 | int err; | |
141 | ||
142 | err = fscrypt_setup_filename(dir, iname, lookup, &crypt_name); | |
143 | if (err) | |
144 | return err; | |
145 | ||
146 | return __f2fs_setup_filename(dir, &crypt_name, fname); | |
147 | } | |
148 | ||
149 | /* | |
150 | * Prepare to look up @dentry in @dir. This is similar to | |
151 | * fscrypt_prepare_lookup(), but this also handles computing the casefolded name | |
152 | * and the f2fs dirhash if needed, then packing all the information about this | |
153 | * filename up into a 'struct f2fs_filename'. | |
154 | */ | |
155 | int f2fs_prepare_lookup(struct inode *dir, struct dentry *dentry, | |
156 | struct f2fs_filename *fname) | |
157 | { | |
158 | struct fscrypt_name crypt_name; | |
159 | int err; | |
160 | ||
161 | err = fscrypt_prepare_lookup(dir, dentry, &crypt_name); | |
162 | if (err) | |
163 | return err; | |
164 | ||
165 | return __f2fs_setup_filename(dir, &crypt_name, fname); | |
166 | } | |
167 | ||
168 | void f2fs_free_filename(struct f2fs_filename *fname) | |
169 | { | |
170 | #ifdef CONFIG_FS_ENCRYPTION | |
171 | kfree(fname->crypto_buf.name); | |
172 | fname->crypto_buf.name = NULL; | |
173 | #endif | |
174 | #ifdef CONFIG_UNICODE | |
175 | kfree(fname->cf_name.name); | |
176 | fname->cf_name.name = NULL; | |
177 | #endif | |
178 | } | |
179 | ||
38431545 JK |
180 | static unsigned long dir_block_index(unsigned int level, |
181 | int dir_level, unsigned int idx) | |
6b4ea016 JK |
182 | { |
183 | unsigned long i; | |
184 | unsigned long bidx = 0; | |
185 | ||
186 | for (i = 0; i < level; i++) | |
38431545 | 187 | bidx += dir_buckets(i, dir_level) * bucket_blocks(i); |
6b4ea016 JK |
188 | bidx += idx * bucket_blocks(level); |
189 | return bidx; | |
190 | } | |
191 | ||
2c2eb7a3 DR |
192 | static struct f2fs_dir_entry *find_in_block(struct inode *dir, |
193 | struct page *dentry_page, | |
43c780ba | 194 | const struct f2fs_filename *fname, |
17f930e0 | 195 | int *max_slots) |
4e6ebf6d JK |
196 | { |
197 | struct f2fs_dentry_block *dentry_blk; | |
7b3cd7d6 | 198 | struct f2fs_dentry_ptr d; |
4e6ebf6d | 199 | |
bdbc90fa | 200 | dentry_blk = (struct f2fs_dentry_block *)page_address(dentry_page); |
7b3cd7d6 | 201 | |
2c2eb7a3 | 202 | make_dentry_ptr_block(dir, &d, dentry_blk); |
17f930e0 | 203 | return f2fs_find_target_dentry(&d, fname, max_slots); |
4e6ebf6d JK |
204 | } |
205 | ||
2c2eb7a3 DR |
206 | #ifdef CONFIG_UNICODE |
207 | /* | |
208 | * Test whether a case-insensitive directory entry matches the filename | |
209 | * being searched for. | |
7ad08a58 DR |
210 | * |
211 | * Returns 1 for a match, 0 for no match, and -errno on an error. | |
2c2eb7a3 | 212 | */ |
7ad08a58 | 213 | static int f2fs_match_ci_name(const struct inode *dir, const struct qstr *name, |
43c780ba | 214 | const u8 *de_name, u32 de_name_len) |
2c2eb7a3 | 215 | { |
eca4873e DR |
216 | const struct super_block *sb = dir->i_sb; |
217 | const struct unicode_map *um = sb->s_encoding; | |
7ad08a58 | 218 | struct fscrypt_str decrypted_name = FSTR_INIT(NULL, de_name_len); |
43c780ba | 219 | struct qstr entry = QSTR_INIT(de_name, de_name_len); |
f874fa1c | 220 | int res; |
2c2eb7a3 | 221 | |
7ad08a58 DR |
222 | if (IS_ENCRYPTED(dir)) { |
223 | const struct fscrypt_str encrypted_name = | |
224 | FSTR_INIT((u8 *)de_name, de_name_len); | |
225 | ||
226 | if (WARN_ON_ONCE(!fscrypt_has_encryption_key(dir))) | |
227 | return -EINVAL; | |
228 | ||
229 | decrypted_name.name = kmalloc(de_name_len, GFP_KERNEL); | |
230 | if (!decrypted_name.name) | |
231 | return -ENOMEM; | |
232 | res = fscrypt_fname_disk_to_usr(dir, 0, 0, &encrypted_name, | |
233 | &decrypted_name); | |
234 | if (res < 0) | |
235 | goto out; | |
236 | entry.name = decrypted_name.name; | |
237 | entry.len = decrypted_name.len; | |
238 | } | |
239 | ||
43c780ba | 240 | res = utf8_strncasecmp_folded(um, name, &entry); |
7ad08a58 DR |
241 | /* |
242 | * In strict mode, ignore invalid names. In non-strict mode, | |
243 | * fall back to treating them as opaque byte sequences. | |
244 | */ | |
245 | if (res < 0 && !sb_has_strict_encoding(sb)) { | |
246 | res = name->len == entry.len && | |
247 | memcmp(name->name, entry.name, name->len) == 0; | |
248 | } else { | |
249 | /* utf8_strncasecmp_folded returns 0 on match */ | |
250 | res = (res == 0); | |
2c2eb7a3 | 251 | } |
7ad08a58 DR |
252 | out: |
253 | kfree(decrypted_name.name); | |
254 | return res; | |
2c2eb7a3 | 255 | } |
43c780ba | 256 | #endif /* CONFIG_UNICODE */ |
950d47f2 | 257 | |
7ad08a58 | 258 | static inline int f2fs_match_name(const struct inode *dir, |
43c780ba EB |
259 | const struct f2fs_filename *fname, |
260 | const u8 *de_name, u32 de_name_len) | |
950d47f2 | 261 | { |
43c780ba | 262 | struct fscrypt_name f; |
950d47f2 | 263 | |
fe76a166 | 264 | #ifdef CONFIG_UNICODE |
43c780ba EB |
265 | if (fname->cf_name.name) { |
266 | struct qstr cf = FSTR_TO_QSTR(&fname->cf_name); | |
fe76a166 | 267 | |
43c780ba | 268 | return f2fs_match_ci_name(dir, &cf, de_name, de_name_len); |
950d47f2 | 269 | } |
fe76a166 | 270 | #endif |
43c780ba EB |
271 | f.usr_fname = fname->usr_fname; |
272 | f.disk_name = fname->disk_name; | |
273 | #ifdef CONFIG_FS_ENCRYPTION | |
274 | f.crypto_buf = fname->crypto_buf; | |
275 | #endif | |
276 | return fscrypt_match_name(&f, de_name, de_name_len); | |
fe76a166 CY |
277 | } |
278 | ||
43c780ba EB |
279 | struct f2fs_dir_entry *f2fs_find_target_dentry(const struct f2fs_dentry_ptr *d, |
280 | const struct f2fs_filename *fname, int *max_slots) | |
6b4ea016 JK |
281 | { |
282 | struct f2fs_dir_entry *de; | |
5d0c6671 | 283 | unsigned long bit_pos = 0; |
5d0c6671 | 284 | int max_len = 0; |
7ad08a58 | 285 | int res = 0; |
6b4ea016 | 286 | |
7b3cd7d6 JK |
287 | if (max_slots) |
288 | *max_slots = 0; | |
289 | while (bit_pos < d->max) { | |
290 | if (!test_bit_le(bit_pos, d->bitmap)) { | |
5d0c6671 | 291 | bit_pos++; |
bda19076 | 292 | max_len++; |
5d0c6671 JK |
293 | continue; |
294 | } | |
bda19076 | 295 | |
7b3cd7d6 | 296 | de = &d->dentry[bit_pos]; |
6e22c691 | 297 | |
a4a13f58 CY |
298 | if (unlikely(!de->name_len)) { |
299 | bit_pos++; | |
300 | continue; | |
301 | } | |
302 | ||
7ad08a58 DR |
303 | if (de->hash_code == fname->hash) { |
304 | res = f2fs_match_name(d->inode, fname, | |
305 | d->filename[bit_pos], | |
306 | le16_to_cpu(de->name_len)); | |
307 | if (res < 0) | |
308 | return ERR_PTR(res); | |
309 | if (res) | |
310 | goto found; | |
311 | } | |
1f73d491 | 312 | |
bda19076 | 313 | if (max_slots && max_len > *max_slots) |
5d0c6671 | 314 | *max_slots = max_len; |
bda19076 | 315 | max_len = 0; |
81e366f8 | 316 | |
5d0c6671 | 317 | bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len)); |
6b4ea016 JK |
318 | } |
319 | ||
320 | de = NULL; | |
6b4ea016 | 321 | found: |
7b3cd7d6 | 322 | if (max_slots && max_len > *max_slots) |
5d0c6671 | 323 | *max_slots = max_len; |
6b4ea016 JK |
324 | return de; |
325 | } | |
326 | ||
327 | static struct f2fs_dir_entry *find_in_level(struct inode *dir, | |
6e22c691 | 328 | unsigned int level, |
43c780ba | 329 | const struct f2fs_filename *fname, |
6e22c691 | 330 | struct page **res_page) |
6b4ea016 | 331 | { |
43c780ba | 332 | int s = GET_DENTRY_SLOTS(fname->disk_name.len); |
6b4ea016 JK |
333 | unsigned int nbucket, nblock; |
334 | unsigned int bidx, end_block; | |
335 | struct page *dentry_page; | |
336 | struct f2fs_dir_entry *de = NULL; | |
337 | bool room = false; | |
4e6ebf6d | 338 | int max_slots; |
6b4ea016 | 339 | |
38431545 | 340 | nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level); |
6b4ea016 JK |
341 | nblock = bucket_blocks(level); |
342 | ||
38431545 | 343 | bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level, |
43c780ba | 344 | le32_to_cpu(fname->hash) % nbucket); |
6b4ea016 JK |
345 | end_block = bidx + nblock; |
346 | ||
347 | for (; bidx < end_block; bidx++) { | |
348 | /* no need to allocate new dentry pages to all the indices */ | |
4d57b86d | 349 | dentry_page = f2fs_find_data_page(dir, bidx); |
6b4ea016 | 350 | if (IS_ERR(dentry_page)) { |
42d96401 JK |
351 | if (PTR_ERR(dentry_page) == -ENOENT) { |
352 | room = true; | |
353 | continue; | |
354 | } else { | |
355 | *res_page = dentry_page; | |
356 | break; | |
357 | } | |
6b4ea016 JK |
358 | } |
359 | ||
17f930e0 | 360 | de = find_in_block(dir, dentry_page, fname, &max_slots); |
7ad08a58 DR |
361 | if (IS_ERR(de)) { |
362 | *res_page = ERR_CAST(de); | |
363 | de = NULL; | |
364 | break; | |
365 | } else if (de) { | |
17f930e0 | 366 | *res_page = dentry_page; |
6b4ea016 | 367 | break; |
17f930e0 | 368 | } |
6b4ea016 JK |
369 | |
370 | if (max_slots >= s) | |
371 | room = true; | |
372 | f2fs_put_page(dentry_page, 0); | |
373 | } | |
374 | ||
43c780ba EB |
375 | if (!de && room && F2FS_I(dir)->chash != fname->hash) { |
376 | F2FS_I(dir)->chash = fname->hash; | |
d3bb910c | 377 | F2FS_I(dir)->clevel = level; |
6b4ea016 JK |
378 | } |
379 | ||
380 | return de; | |
381 | } | |
382 | ||
e7ba108a | 383 | struct f2fs_dir_entry *__f2fs_find_entry(struct inode *dir, |
43c780ba EB |
384 | const struct f2fs_filename *fname, |
385 | struct page **res_page) | |
6b4ea016 | 386 | { |
6b4ea016 JK |
387 | unsigned long npages = dir_blocks(dir); |
388 | struct f2fs_dir_entry *de = NULL; | |
6b4ea016 JK |
389 | unsigned int max_depth; |
390 | unsigned int level; | |
6e22c691 | 391 | |
6d7ab88a CY |
392 | *res_page = NULL; |
393 | ||
6e22c691 | 394 | if (f2fs_has_inline_dentry(dir)) { |
4d57b86d | 395 | de = f2fs_find_in_inline_dir(dir, fname, res_page); |
6e22c691 JK |
396 | goto out; |
397 | } | |
622f28ae | 398 | |
6d7ab88a | 399 | if (npages == 0) |
6e22c691 | 400 | goto out; |
6b4ea016 | 401 | |
6b4ea016 | 402 | max_depth = F2FS_I(dir)->i_current_depth; |
1f6fa261 | 403 | if (unlikely(max_depth > MAX_DIR_HASH_DEPTH)) { |
dcbb4c10 JP |
404 | f2fs_warn(F2FS_I_SB(dir), "Corrupted max_depth of %lu: %u", |
405 | dir->i_ino, max_depth); | |
1f6fa261 | 406 | max_depth = MAX_DIR_HASH_DEPTH; |
205b9822 | 407 | f2fs_i_depth_write(dir, max_depth); |
1f6fa261 | 408 | } |
6b4ea016 JK |
409 | |
410 | for (level = 0; level < max_depth; level++) { | |
e7ba108a | 411 | de = find_in_level(dir, level, fname, res_page); |
42d96401 | 412 | if (de || IS_ERR(*res_page)) |
6b4ea016 JK |
413 | break; |
414 | } | |
6e22c691 | 415 | out: |
d3bb910c SY |
416 | /* This is to increase the speed of f2fs_create */ |
417 | if (!de) | |
418 | F2FS_I(dir)->task = current; | |
e7ba108a SL |
419 | return de; |
420 | } | |
421 | ||
422 | /* | |
423 | * Find an entry in the specified directory with the wanted name. | |
424 | * It returns the page where the entry was found (as a parameter - res_page), | |
425 | * and the entry itself. Page is returned mapped and unlocked. | |
426 | * Entry is guaranteed to be valid. | |
427 | */ | |
428 | struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir, | |
429 | const struct qstr *child, struct page **res_page) | |
430 | { | |
431 | struct f2fs_dir_entry *de = NULL; | |
43c780ba | 432 | struct f2fs_filename fname; |
e7ba108a SL |
433 | int err; |
434 | ||
43c780ba | 435 | err = f2fs_setup_filename(dir, child, 1, &fname); |
e7ba108a | 436 | if (err) { |
54475f53 EB |
437 | if (err == -ENOENT) |
438 | *res_page = NULL; | |
439 | else | |
440 | *res_page = ERR_PTR(err); | |
e7ba108a SL |
441 | return NULL; |
442 | } | |
443 | ||
444 | de = __f2fs_find_entry(dir, &fname, res_page); | |
445 | ||
43c780ba | 446 | f2fs_free_filename(&fname); |
6b4ea016 JK |
447 | return de; |
448 | } | |
449 | ||
450 | struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p) | |
451 | { | |
80e5d1ff | 452 | return f2fs_find_entry(dir, &dotdot_name, p); |
6b4ea016 JK |
453 | } |
454 | ||
835c92d4 | 455 | ino_t f2fs_inode_by_name(struct inode *dir, const struct qstr *qstr, |
91246c21 | 456 | struct page **page) |
6b4ea016 JK |
457 | { |
458 | ino_t res = 0; | |
459 | struct f2fs_dir_entry *de; | |
6b4ea016 | 460 | |
91246c21 | 461 | de = f2fs_find_entry(dir, qstr, page); |
6b4ea016 JK |
462 | if (de) { |
463 | res = le32_to_cpu(de->ino); | |
91246c21 | 464 | f2fs_put_page(*page, 0); |
6b4ea016 JK |
465 | } |
466 | ||
467 | return res; | |
468 | } | |
469 | ||
470 | void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de, | |
471 | struct page *page, struct inode *inode) | |
472 | { | |
59a06155 | 473 | enum page_type type = f2fs_has_inline_dentry(dir) ? NODE : DATA; |
5f029c04 | 474 | |
6b4ea016 | 475 | lock_page(page); |
bae0ee7a | 476 | f2fs_wait_on_page_writeback(page, type, true, true); |
6b4ea016 | 477 | de->ino = cpu_to_le32(inode->i_ino); |
510022a8 | 478 | set_de_type(de, inode->i_mode); |
6b4ea016 | 479 | set_page_dirty(page); |
6666e6aa | 480 | |
078cd827 | 481 | dir->i_mtime = dir->i_ctime = current_time(dir); |
7c45729a | 482 | f2fs_mark_inode_dirty_sync(dir, false); |
6b4ea016 | 483 | f2fs_put_page(page, 1); |
6b4ea016 JK |
484 | } |
485 | ||
7ad08a58 DR |
486 | static void init_dent_inode(struct inode *dir, struct inode *inode, |
487 | const struct f2fs_filename *fname, | |
43c780ba | 488 | struct page *ipage) |
6b4ea016 | 489 | { |
58bfaf44 | 490 | struct f2fs_inode *ri; |
6b4ea016 | 491 | |
7ad08a58 DR |
492 | if (!fname) /* tmpfile case? */ |
493 | return; | |
494 | ||
bae0ee7a | 495 | f2fs_wait_on_page_writeback(ipage, NODE, true, true); |
54b591df | 496 | |
53dc9a67 | 497 | /* copy name info. to this inode page */ |
58bfaf44 | 498 | ri = F2FS_INODE(ipage); |
43c780ba EB |
499 | ri->i_namelen = cpu_to_le32(fname->disk_name.len); |
500 | memcpy(ri->i_name, fname->disk_name.name, fname->disk_name.len); | |
7ad08a58 DR |
501 | if (IS_ENCRYPTED(dir)) { |
502 | file_set_enc_name(inode); | |
503 | /* | |
504 | * Roll-forward recovery doesn't have encryption keys available, | |
505 | * so it can't compute the dirhash for encrypted+casefolded | |
506 | * filenames. Append it to i_name if possible. Else, disable | |
507 | * roll-forward recovery of the dentry (i.e., make fsync'ing the | |
508 | * file force a checkpoint) by setting LOST_PINO. | |
509 | */ | |
510 | if (IS_CASEFOLDED(dir)) { | |
511 | if (fname->disk_name.len + sizeof(f2fs_hash_t) <= | |
512 | F2FS_NAME_LEN) | |
513 | put_unaligned(fname->hash, (f2fs_hash_t *) | |
514 | &ri->i_name[fname->disk_name.len]); | |
515 | else | |
516 | file_lost_pino(inode); | |
517 | } | |
518 | } | |
6b4ea016 JK |
519 | set_page_dirty(ipage); |
520 | } | |
521 | ||
4d57b86d | 522 | void f2fs_do_make_empty_dir(struct inode *inode, struct inode *parent, |
062a3e7b JK |
523 | struct f2fs_dentry_ptr *d) |
524 | { | |
43c780ba EB |
525 | struct fscrypt_str dot = FSTR_INIT(".", 1); |
526 | struct fscrypt_str dotdot = FSTR_INIT("..", 2); | |
062a3e7b | 527 | |
291bf80b CY |
528 | /* update dirent of "." */ |
529 | f2fs_update_dentry(inode->i_ino, inode->i_mode, d, &dot, 0, 0); | |
062a3e7b | 530 | |
291bf80b CY |
531 | /* update dirent of ".." */ |
532 | f2fs_update_dentry(parent->i_ino, parent->i_mode, d, &dotdot, 0, 1); | |
062a3e7b JK |
533 | } |
534 | ||
44a83ff6 JK |
535 | static int make_empty_dir(struct inode *inode, |
536 | struct inode *parent, struct page *page) | |
39936837 JK |
537 | { |
538 | struct page *dentry_page; | |
539 | struct f2fs_dentry_block *dentry_blk; | |
062a3e7b | 540 | struct f2fs_dentry_ptr d; |
39936837 | 541 | |
622f28ae | 542 | if (f2fs_has_inline_dentry(inode)) |
4d57b86d | 543 | return f2fs_make_empty_inline_dir(inode, parent, page); |
622f28ae | 544 | |
4d57b86d | 545 | dentry_page = f2fs_get_new_data_page(inode, page, 0, true); |
39936837 JK |
546 | if (IS_ERR(dentry_page)) |
547 | return PTR_ERR(dentry_page); | |
548 | ||
bdbc90fa | 549 | dentry_blk = page_address(dentry_page); |
39936837 | 550 | |
64c24ecb | 551 | make_dentry_ptr_block(NULL, &d, dentry_blk); |
4d57b86d | 552 | f2fs_do_make_empty_dir(inode, parent, &d); |
39936837 | 553 | |
39936837 JK |
554 | set_page_dirty(dentry_page); |
555 | f2fs_put_page(dentry_page, 1); | |
556 | return 0; | |
557 | } | |
558 | ||
4d57b86d | 559 | struct page *f2fs_init_inode_metadata(struct inode *inode, struct inode *dir, |
43c780ba | 560 | const struct f2fs_filename *fname, struct page *dpage) |
6b4ea016 | 561 | { |
44a83ff6 JK |
562 | struct page *page; |
563 | int err; | |
564 | ||
91942321 | 565 | if (is_inode_flag_set(inode, FI_NEW_INODE)) { |
4d57b86d | 566 | page = f2fs_new_inode_page(inode); |
44a83ff6 JK |
567 | if (IS_ERR(page)) |
568 | return page; | |
6b4ea016 JK |
569 | |
570 | if (S_ISDIR(inode->i_mode)) { | |
221149c0 JK |
571 | /* in order to handle error case */ |
572 | get_page(page); | |
44a83ff6 | 573 | err = make_empty_dir(inode, dir, page); |
221149c0 JK |
574 | if (err) { |
575 | lock_page(page); | |
576 | goto put_error; | |
577 | } | |
578 | put_page(page); | |
6b4ea016 JK |
579 | } |
580 | ||
bce8d112 | 581 | err = f2fs_init_acl(inode, dir, page, dpage); |
44a83ff6 | 582 | if (err) |
a8865372 | 583 | goto put_error; |
44a83ff6 | 584 | |
43c780ba EB |
585 | err = f2fs_init_security(inode, dir, |
586 | fname ? fname->usr_fname : NULL, page); | |
8ae8f162 | 587 | if (err) |
a8865372 | 588 | goto put_error; |
fcc85a4d | 589 | |
8c7d4b57 | 590 | if (IS_ENCRYPTED(inode)) { |
e075b690 | 591 | err = fscrypt_set_context(inode, page); |
fcc85a4d JK |
592 | if (err) |
593 | goto put_error; | |
594 | } | |
6b4ea016 | 595 | } else { |
4d57b86d | 596 | page = f2fs_get_node_page(F2FS_I_SB(dir), inode->i_ino); |
44a83ff6 JK |
597 | if (IS_ERR(page)) |
598 | return page; | |
6b4ea016 | 599 | } |
44a83ff6 | 600 | |
7ad08a58 | 601 | init_dent_inode(dir, inode, fname, page); |
44a83ff6 | 602 | |
83d5d6f6 JK |
603 | /* |
604 | * This file should be checkpointed during fsync. | |
605 | * We lost i_pino from now on. | |
606 | */ | |
91942321 | 607 | if (is_inode_flag_set(inode, FI_INC_LINK)) { |
d58dfb75 SY |
608 | if (!S_ISDIR(inode->i_mode)) |
609 | file_lost_pino(inode); | |
50732df0 CY |
610 | /* |
611 | * If link the tmpfile to alias through linkat path, | |
612 | * we should remove this inode from orphan list. | |
613 | */ | |
614 | if (inode->i_nlink == 0) | |
4d57b86d | 615 | f2fs_remove_orphan_inode(F2FS_I_SB(dir), inode->i_ino); |
a1961246 | 616 | f2fs_i_links_write(inode, true); |
6b4ea016 | 617 | } |
44a83ff6 JK |
618 | return page; |
619 | ||
a8865372 | 620 | put_error: |
221149c0 | 621 | clear_nlink(inode); |
4d57b86d | 622 | f2fs_update_inode(inode, page); |
221149c0 | 623 | f2fs_put_page(page, 1); |
44a83ff6 | 624 | return ERR_PTR(err); |
6b4ea016 JK |
625 | } |
626 | ||
4d57b86d | 627 | void f2fs_update_parent_metadata(struct inode *dir, struct inode *inode, |
6b4ea016 JK |
628 | unsigned int current_depth) |
629 | { | |
91942321 | 630 | if (inode && is_inode_flag_set(inode, FI_NEW_INODE)) { |
ee6d182f | 631 | if (S_ISDIR(inode->i_mode)) |
a1961246 | 632 | f2fs_i_links_write(dir, true); |
91942321 | 633 | clear_inode_flag(inode, FI_NEW_INODE); |
6b4ea016 | 634 | } |
078cd827 | 635 | dir->i_mtime = dir->i_ctime = current_time(dir); |
7c45729a | 636 | f2fs_mark_inode_dirty_sync(dir, false); |
a18ff063 | 637 | |
ee6d182f | 638 | if (F2FS_I(dir)->i_current_depth != current_depth) |
205b9822 | 639 | f2fs_i_depth_write(dir, current_depth); |
6b4ea016 | 640 | |
91942321 JK |
641 | if (inode && is_inode_flag_set(inode, FI_INC_LINK)) |
642 | clear_inode_flag(inode, FI_INC_LINK); | |
6b4ea016 JK |
643 | } |
644 | ||
4d57b86d | 645 | int f2fs_room_for_filename(const void *bitmap, int slots, int max_slots) |
6b4ea016 JK |
646 | { |
647 | int bit_start = 0; | |
648 | int zero_start, zero_end; | |
649 | next: | |
a82afa20 JK |
650 | zero_start = find_next_zero_bit_le(bitmap, max_slots, bit_start); |
651 | if (zero_start >= max_slots) | |
652 | return max_slots; | |
653 | ||
654 | zero_end = find_next_bit_le(bitmap, max_slots, zero_start); | |
6b4ea016 JK |
655 | if (zero_end - zero_start >= slots) |
656 | return zero_start; | |
657 | ||
658 | bit_start = zero_end + 1; | |
659 | ||
a82afa20 JK |
660 | if (zero_end + 1 >= max_slots) |
661 | return max_slots; | |
6b4ea016 JK |
662 | goto next; |
663 | } | |
664 | ||
b06af2af | 665 | bool f2fs_has_enough_room(struct inode *dir, struct page *ipage, |
43c780ba | 666 | const struct f2fs_filename *fname) |
b06af2af JK |
667 | { |
668 | struct f2fs_dentry_ptr d; | |
669 | unsigned int bit_pos; | |
43c780ba | 670 | int slots = GET_DENTRY_SLOTS(fname->disk_name.len); |
b06af2af JK |
671 | |
672 | make_dentry_ptr_inline(dir, &d, inline_data_addr(dir, ipage)); | |
673 | ||
674 | bit_pos = f2fs_room_for_filename(d.bitmap, slots, d.max); | |
675 | ||
676 | return bit_pos < d.max; | |
677 | } | |
678 | ||
510022a8 | 679 | void f2fs_update_dentry(nid_t ino, umode_t mode, struct f2fs_dentry_ptr *d, |
43c780ba EB |
680 | const struct fscrypt_str *name, f2fs_hash_t name_hash, |
681 | unsigned int bit_pos) | |
3b4d732a CY |
682 | { |
683 | struct f2fs_dir_entry *de; | |
684 | int slots = GET_DENTRY_SLOTS(name->len); | |
685 | int i; | |
686 | ||
687 | de = &d->dentry[bit_pos]; | |
688 | de->hash_code = name_hash; | |
689 | de->name_len = cpu_to_le16(name->len); | |
690 | memcpy(d->filename[bit_pos], name->name, name->len); | |
510022a8 JK |
691 | de->ino = cpu_to_le32(ino); |
692 | set_de_type(de, mode); | |
7d9dfa1d | 693 | for (i = 0; i < slots; i++) { |
6bf6b267 | 694 | __set_bit_le(bit_pos + i, (void *)d->bitmap); |
7d9dfa1d JK |
695 | /* avoid wrong garbage data for readdir */ |
696 | if (i) | |
697 | (de + i)->name_len = 0; | |
698 | } | |
3b4d732a CY |
699 | } |
700 | ||
43c780ba EB |
701 | int f2fs_add_regular_entry(struct inode *dir, const struct f2fs_filename *fname, |
702 | struct inode *inode, nid_t ino, umode_t mode) | |
6b4ea016 JK |
703 | { |
704 | unsigned int bit_pos; | |
705 | unsigned int level; | |
706 | unsigned int current_depth; | |
707 | unsigned long bidx, block; | |
6b4ea016 | 708 | unsigned int nbucket, nblock; |
6b4ea016 JK |
709 | struct page *dentry_page = NULL; |
710 | struct f2fs_dentry_block *dentry_blk = NULL; | |
3b4d732a | 711 | struct f2fs_dentry_ptr d; |
510022a8 | 712 | struct page *page = NULL; |
675f10bd | 713 | int slots, err = 0; |
622f28ae | 714 | |
6b4ea016 | 715 | level = 0; |
43c780ba | 716 | slots = GET_DENTRY_SLOTS(fname->disk_name.len); |
9ea97163 | 717 | |
6b4ea016 | 718 | current_depth = F2FS_I(dir)->i_current_depth; |
43c780ba | 719 | if (F2FS_I(dir)->chash == fname->hash) { |
6b4ea016 JK |
720 | level = F2FS_I(dir)->clevel; |
721 | F2FS_I(dir)->chash = 0; | |
722 | } | |
723 | ||
724 | start: | |
55523519 | 725 | if (time_to_inject(F2FS_I_SB(dir), FAULT_DIR_DEPTH)) { |
c45d6002 | 726 | f2fs_show_injection_info(F2FS_I_SB(dir), FAULT_DIR_DEPTH); |
cb78942b | 727 | return -ENOSPC; |
55523519 | 728 | } |
7fa750a1 | 729 | |
675f10bd CY |
730 | if (unlikely(current_depth == MAX_DIR_HASH_DEPTH)) |
731 | return -ENOSPC; | |
6b4ea016 JK |
732 | |
733 | /* Increase the depth, if required */ | |
734 | if (level == current_depth) | |
735 | ++current_depth; | |
736 | ||
38431545 | 737 | nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level); |
6b4ea016 JK |
738 | nblock = bucket_blocks(level); |
739 | ||
38431545 | 740 | bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level, |
43c780ba | 741 | (le32_to_cpu(fname->hash) % nbucket)); |
6b4ea016 JK |
742 | |
743 | for (block = bidx; block <= (bidx + nblock - 1); block++) { | |
4d57b86d | 744 | dentry_page = f2fs_get_new_data_page(dir, NULL, block, true); |
675f10bd CY |
745 | if (IS_ERR(dentry_page)) |
746 | return PTR_ERR(dentry_page); | |
6b4ea016 | 747 | |
bdbc90fa | 748 | dentry_blk = page_address(dentry_page); |
4d57b86d | 749 | bit_pos = f2fs_room_for_filename(&dentry_blk->dentry_bitmap, |
a82afa20 | 750 | slots, NR_DENTRY_IN_BLOCK); |
6b4ea016 JK |
751 | if (bit_pos < NR_DENTRY_IN_BLOCK) |
752 | goto add_dentry; | |
753 | ||
6b4ea016 | 754 | f2fs_put_page(dentry_page, 1); |
6b4ea016 JK |
755 | } |
756 | ||
757 | /* Move to next level to find the empty slot for new dentry */ | |
758 | ++level; | |
759 | goto start; | |
760 | add_dentry: | |
bae0ee7a | 761 | f2fs_wait_on_page_writeback(dentry_page, DATA, true, true); |
6b4ea016 | 762 | |
510022a8 JK |
763 | if (inode) { |
764 | down_write(&F2FS_I(inode)->i_sem); | |
43c780ba | 765 | page = f2fs_init_inode_metadata(inode, dir, fname, NULL); |
510022a8 JK |
766 | if (IS_ERR(page)) { |
767 | err = PTR_ERR(page); | |
768 | goto fail; | |
769 | } | |
44a83ff6 | 770 | } |
3b4d732a | 771 | |
64c24ecb | 772 | make_dentry_ptr_block(NULL, &d, dentry_blk); |
43c780ba EB |
773 | f2fs_update_dentry(ino, mode, &d, &fname->disk_name, fname->hash, |
774 | bit_pos); | |
3b4d732a | 775 | |
6b4ea016 | 776 | set_page_dirty(dentry_page); |
6666e6aa | 777 | |
510022a8 | 778 | if (inode) { |
205b9822 | 779 | f2fs_i_pino_write(inode, dir->i_ino); |
98194030 CY |
780 | |
781 | /* synchronize inode page's data from inode cache */ | |
782 | if (is_inode_flag_set(inode, FI_NEW_INODE)) | |
783 | f2fs_update_inode(inode, page); | |
784 | ||
510022a8 JK |
785 | f2fs_put_page(page, 1); |
786 | } | |
44a83ff6 | 787 | |
4d57b86d | 788 | f2fs_update_parent_metadata(dir, inode, current_depth); |
6b4ea016 | 789 | fail: |
510022a8 JK |
790 | if (inode) |
791 | up_write(&F2FS_I(inode)->i_sem); | |
d928bfbf | 792 | |
6b4ea016 | 793 | f2fs_put_page(dentry_page, 1); |
675f10bd CY |
794 | |
795 | return err; | |
796 | } | |
797 | ||
43c780ba EB |
798 | int f2fs_add_dentry(struct inode *dir, const struct f2fs_filename *fname, |
799 | struct inode *inode, nid_t ino, umode_t mode) | |
e7ba108a | 800 | { |
e7ba108a SL |
801 | int err = -EAGAIN; |
802 | ||
e7ba108a | 803 | if (f2fs_has_inline_dentry(dir)) |
43c780ba | 804 | err = f2fs_add_inline_entry(dir, fname, inode, ino, mode); |
e7ba108a | 805 | if (err == -EAGAIN) |
43c780ba | 806 | err = f2fs_add_regular_entry(dir, fname, inode, ino, mode); |
e7ba108a SL |
807 | |
808 | f2fs_update_time(F2FS_I_SB(dir), REQ_TIME); | |
809 | return err; | |
810 | } | |
811 | ||
675f10bd CY |
812 | /* |
813 | * Caller should grab and release a rwsem by calling f2fs_lock_op() and | |
814 | * f2fs_unlock_op(). | |
815 | */ | |
4d57b86d | 816 | int f2fs_do_add_link(struct inode *dir, const struct qstr *name, |
675f10bd CY |
817 | struct inode *inode, nid_t ino, umode_t mode) |
818 | { | |
43c780ba | 819 | struct f2fs_filename fname; |
88c5c13a JK |
820 | struct page *page = NULL; |
821 | struct f2fs_dir_entry *de = NULL; | |
675f10bd CY |
822 | int err; |
823 | ||
43c780ba | 824 | err = f2fs_setup_filename(dir, name, 0, &fname); |
675f10bd CY |
825 | if (err) |
826 | return err; | |
827 | ||
88c5c13a | 828 | /* |
e5cc2c55 | 829 | * An immature stackable filesystem shows a race condition between lookup |
88c5c13a JK |
830 | * and create. If we have same task when doing lookup and create, it's |
831 | * definitely fine as expected by VFS normally. Otherwise, let's just | |
832 | * verify on-disk dentry one more time, which guarantees filesystem | |
833 | * consistency more. | |
834 | */ | |
835 | if (current != F2FS_I(dir)->task) { | |
836 | de = __f2fs_find_entry(dir, &fname, &page); | |
837 | F2FS_I(dir)->task = NULL; | |
838 | } | |
839 | if (de) { | |
88c5c13a JK |
840 | f2fs_put_page(page, 0); |
841 | err = -EEXIST; | |
842 | } else if (IS_ERR(page)) { | |
843 | err = PTR_ERR(page); | |
844 | } else { | |
4d57b86d | 845 | err = f2fs_add_dentry(dir, &fname, inode, ino, mode); |
88c5c13a | 846 | } |
43c780ba | 847 | f2fs_free_filename(&fname); |
6b4ea016 JK |
848 | return err; |
849 | } | |
850 | ||
b97a9b5d JK |
851 | int f2fs_do_tmpfile(struct inode *inode, struct inode *dir) |
852 | { | |
853 | struct page *page; | |
854 | int err = 0; | |
855 | ||
856 | down_write(&F2FS_I(inode)->i_sem); | |
43c780ba | 857 | page = f2fs_init_inode_metadata(inode, dir, NULL, NULL); |
b97a9b5d JK |
858 | if (IS_ERR(page)) { |
859 | err = PTR_ERR(page); | |
860 | goto fail; | |
861 | } | |
b97a9b5d JK |
862 | f2fs_put_page(page, 1); |
863 | ||
91942321 | 864 | clear_inode_flag(inode, FI_NEW_INODE); |
c75f2feb | 865 | f2fs_update_time(F2FS_I_SB(inode), REQ_TIME); |
b97a9b5d JK |
866 | fail: |
867 | up_write(&F2FS_I(inode)->i_sem); | |
868 | return err; | |
869 | } | |
870 | ||
9f7c45cc | 871 | void f2fs_drop_nlink(struct inode *dir, struct inode *inode) |
dbeacf02 CY |
872 | { |
873 | struct f2fs_sb_info *sbi = F2FS_I_SB(dir); | |
874 | ||
875 | down_write(&F2FS_I(inode)->i_sem); | |
876 | ||
ee6d182f | 877 | if (S_ISDIR(inode->i_mode)) |
a1961246 | 878 | f2fs_i_links_write(dir, false); |
078cd827 | 879 | inode->i_ctime = current_time(inode); |
dbeacf02 | 880 | |
a1961246 | 881 | f2fs_i_links_write(inode, false); |
dbeacf02 | 882 | if (S_ISDIR(inode->i_mode)) { |
a1961246 | 883 | f2fs_i_links_write(inode, false); |
fc9581c8 | 884 | f2fs_i_size_write(inode, 0); |
dbeacf02 CY |
885 | } |
886 | up_write(&F2FS_I(inode)->i_sem); | |
dbeacf02 CY |
887 | |
888 | if (inode->i_nlink == 0) | |
4d57b86d | 889 | f2fs_add_orphan_inode(inode); |
dbeacf02 | 890 | else |
4d57b86d | 891 | f2fs_release_orphan_inode(sbi); |
dbeacf02 CY |
892 | } |
893 | ||
0a8165d7 | 894 | /* |
e1c42045 | 895 | * It only removes the dentry from the dentry page, corresponding name |
6b4ea016 JK |
896 | * entry in name page does not need to be touched during deletion. |
897 | */ | |
898 | void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page, | |
dbeacf02 | 899 | struct inode *dir, struct inode *inode) |
6b4ea016 JK |
900 | { |
901 | struct f2fs_dentry_block *dentry_blk; | |
902 | unsigned int bit_pos; | |
457d08ee | 903 | int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len)); |
6b4ea016 JK |
904 | int i; |
905 | ||
d0239e1b JK |
906 | f2fs_update_time(F2FS_I_SB(dir), REQ_TIME); |
907 | ||
63189b78 | 908 | if (F2FS_OPTION(F2FS_I_SB(dir)).fsync_mode == FSYNC_MODE_STRICT) |
4d57b86d | 909 | f2fs_add_ino_entry(F2FS_I_SB(dir), dir->i_ino, TRANS_DIR_INO); |
0a007b97 | 910 | |
622f28ae CY |
911 | if (f2fs_has_inline_dentry(dir)) |
912 | return f2fs_delete_inline_entry(dentry, page, dir, inode); | |
913 | ||
6b4ea016 | 914 | lock_page(page); |
bae0ee7a | 915 | f2fs_wait_on_page_writeback(page, DATA, true, true); |
6b4ea016 | 916 | |
1c3bb978 GZ |
917 | dentry_blk = page_address(page); |
918 | bit_pos = dentry - dentry_blk->dentry; | |
6b4ea016 | 919 | for (i = 0; i < slots; i++) |
23380b85 | 920 | __clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap); |
6b4ea016 JK |
921 | |
922 | /* Let's check and deallocate this dentry page */ | |
923 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
924 | NR_DENTRY_IN_BLOCK, | |
925 | 0); | |
6b4ea016 JK |
926 | set_page_dirty(page); |
927 | ||
206e61be | 928 | if (bit_pos == NR_DENTRY_IN_BLOCK && |
4d57b86d | 929 | !f2fs_truncate_hole(dir, page->index, page->index + 1)) { |
5ec2d99d | 930 | f2fs_clear_page_cache_dirty_tag(page); |
6b4ea016 | 931 | clear_page_dirty_for_io(page); |
240a5915 | 932 | f2fs_clear_page_private(page); |
6b4ea016 | 933 | ClearPageUptodate(page); |
2baf0781 | 934 | clear_cold_data(page); |
a7ffdbe2 | 935 | inode_dec_dirty_pages(dir); |
4d57b86d | 936 | f2fs_remove_dirty_inode(dir); |
6b4ea016 | 937 | } |
508198be | 938 | f2fs_put_page(page, 1); |
9995e401 CY |
939 | |
940 | dir->i_ctime = dir->i_mtime = current_time(dir); | |
941 | f2fs_mark_inode_dirty_sync(dir, false); | |
942 | ||
943 | if (inode) | |
944 | f2fs_drop_nlink(dir, inode); | |
6b4ea016 JK |
945 | } |
946 | ||
947 | bool f2fs_empty_dir(struct inode *dir) | |
948 | { | |
949 | unsigned long bidx; | |
950 | struct page *dentry_page; | |
951 | unsigned int bit_pos; | |
dbeacf02 | 952 | struct f2fs_dentry_block *dentry_blk; |
6b4ea016 JK |
953 | unsigned long nblock = dir_blocks(dir); |
954 | ||
622f28ae CY |
955 | if (f2fs_has_inline_dentry(dir)) |
956 | return f2fs_empty_inline_dir(dir); | |
957 | ||
6b4ea016 | 958 | for (bidx = 0; bidx < nblock; bidx++) { |
4d57b86d | 959 | dentry_page = f2fs_get_lock_data_page(dir, bidx, false); |
6b4ea016 JK |
960 | if (IS_ERR(dentry_page)) { |
961 | if (PTR_ERR(dentry_page) == -ENOENT) | |
962 | continue; | |
963 | else | |
964 | return false; | |
965 | } | |
966 | ||
bdbc90fa | 967 | dentry_blk = page_address(dentry_page); |
6b4ea016 JK |
968 | if (bidx == 0) |
969 | bit_pos = 2; | |
970 | else | |
971 | bit_pos = 0; | |
972 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
973 | NR_DENTRY_IN_BLOCK, | |
974 | bit_pos); | |
6b4ea016 JK |
975 | |
976 | f2fs_put_page(dentry_page, 1); | |
977 | ||
978 | if (bit_pos < NR_DENTRY_IN_BLOCK) | |
979 | return false; | |
980 | } | |
981 | return true; | |
982 | } | |
983 | ||
ed6bd4b1 | 984 | int f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d, |
0b81d077 | 985 | unsigned int start_pos, struct fscrypt_str *fstr) |
38594de7 JK |
986 | { |
987 | unsigned char d_type = DT_UNKNOWN; | |
988 | unsigned int bit_pos; | |
989 | struct f2fs_dir_entry *de = NULL; | |
0b81d077 | 990 | struct fscrypt_str de_name = FSTR_INIT(NULL, 0); |
f6df8f23 | 991 | struct f2fs_sb_info *sbi = F2FS_I_SB(d->inode); |
e1293bdf CY |
992 | struct blk_plug plug; |
993 | bool readdir_ra = sbi->readdir_ra == 1; | |
994 | int err = 0; | |
38594de7 | 995 | |
7b3cd7d6 | 996 | bit_pos = ((unsigned long)ctx->pos % d->max); |
38594de7 | 997 | |
e1293bdf CY |
998 | if (readdir_ra) |
999 | blk_start_plug(&plug); | |
1000 | ||
7b3cd7d6 JK |
1001 | while (bit_pos < d->max) { |
1002 | bit_pos = find_next_bit_le(d->bitmap, d->max, bit_pos); | |
1003 | if (bit_pos >= d->max) | |
38594de7 JK |
1004 | break; |
1005 | ||
7b3cd7d6 | 1006 | de = &d->dentry[bit_pos]; |
7d9dfa1d JK |
1007 | if (de->name_len == 0) { |
1008 | bit_pos++; | |
1009 | ctx->pos = start_pos + bit_pos; | |
ddf06b75 | 1010 | printk_ratelimited( |
c45d6002 CY |
1011 | "%sF2FS-fs (%s): invalid namelen(0), ino:%u, run fsck to fix.", |
1012 | KERN_WARNING, sbi->sb->s_id, | |
1013 | le32_to_cpu(de->ino)); | |
ddf06b75 | 1014 | set_sbi_flag(sbi, SBI_NEED_FSCK); |
7d9dfa1d JK |
1015 | continue; |
1016 | } | |
1017 | ||
4d57b86d | 1018 | d_type = f2fs_get_de_type(de); |
d8c6822a | 1019 | |
d8c6822a JK |
1020 | de_name.name = d->filename[bit_pos]; |
1021 | de_name.len = le16_to_cpu(de->name_len); | |
1022 | ||
4e240d1b JK |
1023 | /* check memory boundary before moving forward */ |
1024 | bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len)); | |
720db068 SY |
1025 | if (unlikely(bit_pos > d->max || |
1026 | le16_to_cpu(de->name_len) > F2FS_NAME_LEN)) { | |
dcbb4c10 JP |
1027 | f2fs_warn(sbi, "%s: corrupted namelen=%d, run fsck to fix.", |
1028 | __func__, le16_to_cpu(de->name_len)); | |
4e240d1b | 1029 | set_sbi_flag(sbi, SBI_NEED_FSCK); |
10f966bb | 1030 | err = -EFSCORRUPTED; |
4e240d1b JK |
1031 | goto out; |
1032 | } | |
1033 | ||
62230e0d | 1034 | if (IS_ENCRYPTED(d->inode)) { |
d8c6822a | 1035 | int save_len = fstr->len; |
d8c6822a | 1036 | |
ef1eb3aa | 1037 | err = fscrypt_fname_disk_to_usr(d->inode, |
36af5f40 CY |
1038 | (u32)le32_to_cpu(de->hash_code), |
1039 | 0, &de_name, fstr); | |
ef1eb3aa | 1040 | if (err) |
e1293bdf | 1041 | goto out; |
569cf187 JK |
1042 | |
1043 | de_name = *fstr; | |
1044 | fstr->len = save_len; | |
d8c6822a JK |
1045 | } |
1046 | ||
1047 | if (!dir_emit(ctx, de_name.name, de_name.len, | |
e1293bdf CY |
1048 | le32_to_cpu(de->ino), d_type)) { |
1049 | err = 1; | |
1050 | goto out; | |
1051 | } | |
38594de7 | 1052 | |
e1293bdf | 1053 | if (readdir_ra) |
4d57b86d | 1054 | f2fs_ra_node_page(sbi, le32_to_cpu(de->ino)); |
f6df8f23 | 1055 | |
38594de7 JK |
1056 | ctx->pos = start_pos + bit_pos; |
1057 | } | |
e1293bdf CY |
1058 | out: |
1059 | if (readdir_ra) | |
1060 | blk_finish_plug(&plug); | |
1061 | return err; | |
38594de7 JK |
1062 | } |
1063 | ||
6f7f231e | 1064 | static int f2fs_readdir(struct file *file, struct dir_context *ctx) |
6b4ea016 | 1065 | { |
496ad9aa | 1066 | struct inode *inode = file_inode(file); |
6b4ea016 | 1067 | unsigned long npages = dir_blocks(inode); |
6b4ea016 | 1068 | struct f2fs_dentry_block *dentry_blk = NULL; |
6b4ea016 | 1069 | struct page *dentry_page = NULL; |
817202d9 | 1070 | struct file_ra_state *ra = &file->f_ra; |
e97a3c4c | 1071 | loff_t start_pos = ctx->pos; |
6f7f231e | 1072 | unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK); |
7b3cd7d6 | 1073 | struct f2fs_dentry_ptr d; |
0b81d077 | 1074 | struct fscrypt_str fstr = FSTR_INIT(NULL, 0); |
d8c6822a | 1075 | int err = 0; |
6b4ea016 | 1076 | |
62230e0d | 1077 | if (IS_ENCRYPTED(inode)) { |
ec0caa97 | 1078 | err = fscrypt_prepare_readdir(inode); |
3b1ada55 | 1079 | if (err) |
e97a3c4c | 1080 | goto out; |
26bf3dc7 | 1081 | |
8b10fe68 | 1082 | err = fscrypt_fname_alloc_buffer(F2FS_NAME_LEN, &fstr); |
d8c6822a | 1083 | if (err < 0) |
e97a3c4c | 1084 | goto out; |
d8c6822a JK |
1085 | } |
1086 | ||
1087 | if (f2fs_has_inline_dentry(inode)) { | |
1088 | err = f2fs_read_inline_dir(file, ctx, &fstr); | |
e97a3c4c | 1089 | goto out_free; |
d8c6822a | 1090 | } |
622f28ae | 1091 | |
ab383be5 | 1092 | for (; n < npages; n++, ctx->pos = n * NR_DENTRY_IN_BLOCK) { |
4414dea8 CY |
1093 | |
1094 | /* allow readdir() to be interrupted */ | |
1095 | if (fatal_signal_pending(current)) { | |
1096 | err = -ERESTARTSYS; | |
1097 | goto out_free; | |
1098 | } | |
1099 | cond_resched(); | |
1100 | ||
cb7a8448 CY |
1101 | /* readahead for multi pages of dir */ |
1102 | if (npages - n > 1 && !ra_has_index(ra, n)) | |
1103 | page_cache_sync_readahead(inode->i_mapping, ra, file, n, | |
1104 | min(npages - n, (pgoff_t)MAX_DIR_RA_PAGES)); | |
1105 | ||
613f3dcd | 1106 | dentry_page = f2fs_find_data_page(inode, n); |
57b62d29 CY |
1107 | if (IS_ERR(dentry_page)) { |
1108 | err = PTR_ERR(dentry_page); | |
ed6bd4b1 CY |
1109 | if (err == -ENOENT) { |
1110 | err = 0; | |
57b62d29 | 1111 | continue; |
ed6bd4b1 | 1112 | } else { |
e97a3c4c | 1113 | goto out_free; |
ed6bd4b1 | 1114 | } |
57b62d29 | 1115 | } |
6b4ea016 | 1116 | |
bdbc90fa | 1117 | dentry_blk = page_address(dentry_page); |
99b072bb | 1118 | |
64c24ecb | 1119 | make_dentry_ptr_block(inode, &d, dentry_blk); |
7b3cd7d6 | 1120 | |
ed6bd4b1 CY |
1121 | err = f2fs_fill_dentries(ctx, &d, |
1122 | n * NR_DENTRY_IN_BLOCK, &fstr); | |
1123 | if (err) { | |
613f3dcd | 1124 | f2fs_put_page(dentry_page, 0); |
e9837bc2 CY |
1125 | break; |
1126 | } | |
38594de7 | 1127 | |
613f3dcd | 1128 | f2fs_put_page(dentry_page, 0); |
6b4ea016 | 1129 | } |
e97a3c4c | 1130 | out_free: |
0b81d077 | 1131 | fscrypt_fname_free_buffer(&fstr); |
e97a3c4c CY |
1132 | out: |
1133 | trace_f2fs_readdir(inode, start_pos, ctx->pos, err); | |
ed6bd4b1 | 1134 | return err < 0 ? err : 0; |
6b4ea016 JK |
1135 | } |
1136 | ||
1137 | const struct file_operations f2fs_dir_operations = { | |
1138 | .llseek = generic_file_llseek, | |
1139 | .read = generic_read_dir, | |
e77d0c63 | 1140 | .iterate_shared = f2fs_readdir, |
6b4ea016 JK |
1141 | .fsync = f2fs_sync_file, |
1142 | .unlocked_ioctl = f2fs_ioctl, | |
08b95126 | 1143 | #ifdef CONFIG_COMPAT |
1144 | .compat_ioctl = f2fs_compat_ioctl, | |
1145 | #endif | |
6b4ea016 | 1146 | }; |