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 | ||
dbeacf02 | 40 | unsigned char f2fs_filetype_table[F2FS_FT_MAX] = { |
6b4ea016 JK |
41 | [F2FS_FT_UNKNOWN] = DT_UNKNOWN, |
42 | [F2FS_FT_REG_FILE] = DT_REG, | |
43 | [F2FS_FT_DIR] = DT_DIR, | |
44 | [F2FS_FT_CHRDEV] = DT_CHR, | |
45 | [F2FS_FT_BLKDEV] = DT_BLK, | |
46 | [F2FS_FT_FIFO] = DT_FIFO, | |
47 | [F2FS_FT_SOCK] = DT_SOCK, | |
48 | [F2FS_FT_SYMLINK] = DT_LNK, | |
49 | }; | |
50 | ||
6b4ea016 JK |
51 | static unsigned char f2fs_type_by_mode[S_IFMT >> S_SHIFT] = { |
52 | [S_IFREG >> S_SHIFT] = F2FS_FT_REG_FILE, | |
53 | [S_IFDIR >> S_SHIFT] = F2FS_FT_DIR, | |
54 | [S_IFCHR >> S_SHIFT] = F2FS_FT_CHRDEV, | |
55 | [S_IFBLK >> S_SHIFT] = F2FS_FT_BLKDEV, | |
56 | [S_IFIFO >> S_SHIFT] = F2FS_FT_FIFO, | |
57 | [S_IFSOCK >> S_SHIFT] = F2FS_FT_SOCK, | |
58 | [S_IFLNK >> S_SHIFT] = F2FS_FT_SYMLINK, | |
59 | }; | |
60 | ||
510022a8 | 61 | void set_de_type(struct f2fs_dir_entry *de, umode_t mode) |
6b4ea016 | 62 | { |
6b4ea016 JK |
63 | de->file_type = f2fs_type_by_mode[(mode & S_IFMT) >> S_SHIFT]; |
64 | } | |
65 | ||
675f10bd CY |
66 | unsigned char get_de_type(struct f2fs_dir_entry *de) |
67 | { | |
68 | if (de->file_type < F2FS_FT_MAX) | |
69 | return f2fs_filetype_table[de->file_type]; | |
70 | return DT_UNKNOWN; | |
71 | } | |
72 | ||
38431545 JK |
73 | static unsigned long dir_block_index(unsigned int level, |
74 | int dir_level, unsigned int idx) | |
6b4ea016 JK |
75 | { |
76 | unsigned long i; | |
77 | unsigned long bidx = 0; | |
78 | ||
79 | for (i = 0; i < level; i++) | |
38431545 | 80 | bidx += dir_buckets(i, dir_level) * bucket_blocks(i); |
6b4ea016 JK |
81 | bidx += idx * bucket_blocks(level); |
82 | return bidx; | |
83 | } | |
84 | ||
6b4ea016 | 85 | static struct f2fs_dir_entry *find_in_block(struct page *dentry_page, |
0b81d077 | 86 | struct fscrypt_name *fname, |
6e22c691 JK |
87 | f2fs_hash_t namehash, |
88 | int *max_slots, | |
4e6ebf6d JK |
89 | struct page **res_page) |
90 | { | |
91 | struct f2fs_dentry_block *dentry_blk; | |
92 | struct f2fs_dir_entry *de; | |
7b3cd7d6 | 93 | struct f2fs_dentry_ptr d; |
4e6ebf6d JK |
94 | |
95 | dentry_blk = (struct f2fs_dentry_block *)kmap(dentry_page); | |
7b3cd7d6 | 96 | |
d8c6822a | 97 | make_dentry_ptr(NULL, &d, (void *)dentry_blk, 1); |
6e22c691 | 98 | de = find_target_dentry(fname, namehash, max_slots, &d); |
4e6ebf6d JK |
99 | if (de) |
100 | *res_page = dentry_page; | |
101 | else | |
102 | kunmap(dentry_page); | |
103 | ||
4e6ebf6d JK |
104 | return de; |
105 | } | |
106 | ||
0b81d077 | 107 | struct f2fs_dir_entry *find_target_dentry(struct fscrypt_name *fname, |
6e22c691 JK |
108 | f2fs_hash_t namehash, int *max_slots, |
109 | struct f2fs_dentry_ptr *d) | |
6b4ea016 JK |
110 | { |
111 | struct f2fs_dir_entry *de; | |
5d0c6671 | 112 | unsigned long bit_pos = 0; |
5d0c6671 | 113 | int max_len = 0; |
0b81d077 JK |
114 | struct fscrypt_str de_name = FSTR_INIT(NULL, 0); |
115 | struct fscrypt_str *name = &fname->disk_name; | |
6b4ea016 | 116 | |
7b3cd7d6 JK |
117 | if (max_slots) |
118 | *max_slots = 0; | |
119 | while (bit_pos < d->max) { | |
120 | if (!test_bit_le(bit_pos, d->bitmap)) { | |
5d0c6671 | 121 | bit_pos++; |
bda19076 | 122 | max_len++; |
5d0c6671 JK |
123 | continue; |
124 | } | |
bda19076 | 125 | |
7b3cd7d6 | 126 | de = &d->dentry[bit_pos]; |
6e22c691 | 127 | |
a4a13f58 CY |
128 | if (unlikely(!de->name_len)) { |
129 | bit_pos++; | |
130 | continue; | |
131 | } | |
132 | ||
6e22c691 JK |
133 | /* encrypted case */ |
134 | de_name.name = d->filename[bit_pos]; | |
135 | de_name.len = le16_to_cpu(de->name_len); | |
136 | ||
137 | /* show encrypted name */ | |
138 | if (fname->hash) { | |
139 | if (de->hash_code == fname->hash) | |
140 | goto found; | |
141 | } else if (de_name.len == name->len && | |
142 | de->hash_code == namehash && | |
143 | !memcmp(de_name.name, name->name, name->len)) | |
4e6ebf6d JK |
144 | goto found; |
145 | ||
bda19076 | 146 | if (max_slots && max_len > *max_slots) |
5d0c6671 | 147 | *max_slots = max_len; |
bda19076 | 148 | max_len = 0; |
81e366f8 | 149 | |
5d0c6671 | 150 | bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len)); |
6b4ea016 JK |
151 | } |
152 | ||
153 | de = NULL; | |
6b4ea016 | 154 | found: |
7b3cd7d6 | 155 | if (max_slots && max_len > *max_slots) |
5d0c6671 | 156 | *max_slots = max_len; |
6b4ea016 JK |
157 | return de; |
158 | } | |
159 | ||
160 | static struct f2fs_dir_entry *find_in_level(struct inode *dir, | |
6e22c691 | 161 | unsigned int level, |
0b81d077 | 162 | struct fscrypt_name *fname, |
6e22c691 | 163 | struct page **res_page) |
6b4ea016 | 164 | { |
6e22c691 JK |
165 | struct qstr name = FSTR_TO_QSTR(&fname->disk_name); |
166 | int s = GET_DENTRY_SLOTS(name.len); | |
6b4ea016 JK |
167 | unsigned int nbucket, nblock; |
168 | unsigned int bidx, end_block; | |
169 | struct page *dentry_page; | |
170 | struct f2fs_dir_entry *de = NULL; | |
171 | bool room = false; | |
4e6ebf6d | 172 | int max_slots; |
6e22c691 JK |
173 | f2fs_hash_t namehash; |
174 | ||
175 | namehash = f2fs_dentry_hash(&name); | |
6b4ea016 | 176 | |
38431545 | 177 | nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level); |
6b4ea016 JK |
178 | nblock = bucket_blocks(level); |
179 | ||
38431545 JK |
180 | bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level, |
181 | le32_to_cpu(namehash) % nbucket); | |
6b4ea016 JK |
182 | end_block = bidx + nblock; |
183 | ||
184 | for (; bidx < end_block; bidx++) { | |
185 | /* no need to allocate new dentry pages to all the indices */ | |
43f3eae1 | 186 | dentry_page = find_data_page(dir, bidx); |
6b4ea016 | 187 | if (IS_ERR(dentry_page)) { |
42d96401 JK |
188 | if (PTR_ERR(dentry_page) == -ENOENT) { |
189 | room = true; | |
190 | continue; | |
191 | } else { | |
192 | *res_page = dentry_page; | |
193 | break; | |
194 | } | |
6b4ea016 JK |
195 | } |
196 | ||
6e22c691 JK |
197 | de = find_in_block(dentry_page, fname, namehash, &max_slots, |
198 | res_page); | |
6b4ea016 JK |
199 | if (de) |
200 | break; | |
201 | ||
202 | if (max_slots >= s) | |
203 | room = true; | |
204 | f2fs_put_page(dentry_page, 0); | |
205 | } | |
206 | ||
207 | if (!de && room && F2FS_I(dir)->chash != namehash) { | |
208 | F2FS_I(dir)->chash = namehash; | |
209 | F2FS_I(dir)->clevel = level; | |
210 | } | |
211 | ||
212 | return de; | |
213 | } | |
214 | ||
215 | /* | |
216 | * Find an entry in the specified directory with the wanted name. | |
217 | * It returns the page where the entry was found (as a parameter - res_page), | |
218 | * and the entry itself. Page is returned mapped and unlocked. | |
219 | * Entry is guaranteed to be valid. | |
220 | */ | |
221 | struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir, | |
185de68f | 222 | const struct qstr *child, struct page **res_page) |
6b4ea016 | 223 | { |
6b4ea016 JK |
224 | unsigned long npages = dir_blocks(dir); |
225 | struct f2fs_dir_entry *de = NULL; | |
6b4ea016 JK |
226 | unsigned int max_depth; |
227 | unsigned int level; | |
0b81d077 | 228 | struct fscrypt_name fname; |
6e22c691 | 229 | int err; |
6b4ea016 | 230 | |
0b81d077 | 231 | err = fscrypt_setup_filename(dir, child, 1, &fname); |
42d96401 | 232 | if (err) { |
eb4246dc | 233 | *res_page = ERR_PTR(err); |
6e22c691 | 234 | return NULL; |
42d96401 | 235 | } |
6e22c691 JK |
236 | |
237 | if (f2fs_has_inline_dentry(dir)) { | |
42d96401 | 238 | *res_page = NULL; |
6e22c691 JK |
239 | de = find_in_inline_dir(dir, &fname, res_page); |
240 | goto out; | |
241 | } | |
622f28ae | 242 | |
42d96401 JK |
243 | if (npages == 0) { |
244 | *res_page = NULL; | |
6e22c691 | 245 | goto out; |
42d96401 | 246 | } |
6b4ea016 | 247 | |
6b4ea016 | 248 | max_depth = F2FS_I(dir)->i_current_depth; |
1f6fa261 JK |
249 | if (unlikely(max_depth > MAX_DIR_HASH_DEPTH)) { |
250 | f2fs_msg(F2FS_I_SB(dir)->sb, KERN_WARNING, | |
251 | "Corrupted max_depth of %lu: %u", | |
252 | dir->i_ino, max_depth); | |
253 | max_depth = MAX_DIR_HASH_DEPTH; | |
205b9822 | 254 | f2fs_i_depth_write(dir, max_depth); |
1f6fa261 | 255 | } |
6b4ea016 JK |
256 | |
257 | for (level = 0; level < max_depth; level++) { | |
42d96401 | 258 | *res_page = NULL; |
6e22c691 | 259 | de = find_in_level(dir, level, &fname, res_page); |
42d96401 | 260 | if (de || IS_ERR(*res_page)) |
6b4ea016 JK |
261 | break; |
262 | } | |
6e22c691 | 263 | out: |
0b81d077 | 264 | fscrypt_free_filename(&fname); |
6b4ea016 JK |
265 | return de; |
266 | } | |
267 | ||
268 | struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p) | |
269 | { | |
8be0fea9 | 270 | struct qstr dotdot = QSTR_INIT("..", 2); |
622f28ae | 271 | |
8be0fea9 | 272 | return f2fs_find_entry(dir, &dotdot, p); |
6b4ea016 JK |
273 | } |
274 | ||
835c92d4 | 275 | ino_t f2fs_inode_by_name(struct inode *dir, const struct qstr *qstr, |
91246c21 | 276 | struct page **page) |
6b4ea016 JK |
277 | { |
278 | ino_t res = 0; | |
279 | struct f2fs_dir_entry *de; | |
6b4ea016 | 280 | |
91246c21 | 281 | de = f2fs_find_entry(dir, qstr, page); |
6b4ea016 JK |
282 | if (de) { |
283 | res = le32_to_cpu(de->ino); | |
91246c21 CY |
284 | f2fs_dentry_kunmap(dir, *page); |
285 | f2fs_put_page(*page, 0); | |
6b4ea016 JK |
286 | } |
287 | ||
288 | return res; | |
289 | } | |
290 | ||
291 | void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de, | |
292 | struct page *page, struct inode *inode) | |
293 | { | |
59a06155 | 294 | enum page_type type = f2fs_has_inline_dentry(dir) ? NODE : DATA; |
6b4ea016 | 295 | lock_page(page); |
fec1d657 | 296 | f2fs_wait_on_page_writeback(page, type, true); |
6b4ea016 | 297 | de->ino = cpu_to_le32(inode->i_ino); |
510022a8 | 298 | set_de_type(de, inode->i_mode); |
5df1f1da | 299 | f2fs_dentry_kunmap(dir, page); |
6b4ea016 | 300 | set_page_dirty(page); |
6666e6aa | 301 | |
205b9822 | 302 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
b56ab837 | 303 | f2fs_mark_inode_dirty_sync(dir); |
6b4ea016 | 304 | f2fs_put_page(page, 1); |
6b4ea016 JK |
305 | } |
306 | ||
44a83ff6 | 307 | static void init_dent_inode(const struct qstr *name, struct page *ipage) |
6b4ea016 | 308 | { |
58bfaf44 | 309 | struct f2fs_inode *ri; |
6b4ea016 | 310 | |
fec1d657 | 311 | f2fs_wait_on_page_writeback(ipage, NODE, true); |
54b591df | 312 | |
53dc9a67 | 313 | /* copy name info. to this inode page */ |
58bfaf44 JK |
314 | ri = F2FS_INODE(ipage); |
315 | ri->i_namelen = cpu_to_le32(name->len); | |
316 | memcpy(ri->i_name, name->name, name->len); | |
6b4ea016 JK |
317 | set_page_dirty(ipage); |
318 | } | |
319 | ||
e7d55452 JK |
320 | int update_dent_inode(struct inode *inode, struct inode *to, |
321 | const struct qstr *name) | |
1cd14caf | 322 | { |
1cd14caf JK |
323 | struct page *page; |
324 | ||
e7d55452 JK |
325 | if (file_enc_name(to)) |
326 | return 0; | |
327 | ||
4081363f | 328 | page = get_node_page(F2FS_I_SB(inode), inode->i_ino); |
1cd14caf JK |
329 | if (IS_ERR(page)) |
330 | return PTR_ERR(page); | |
331 | ||
332 | init_dent_inode(name, page); | |
333 | f2fs_put_page(page, 1); | |
334 | ||
335 | return 0; | |
336 | } | |
337 | ||
062a3e7b JK |
338 | void do_make_empty_dir(struct inode *inode, struct inode *parent, |
339 | struct f2fs_dentry_ptr *d) | |
340 | { | |
291bf80b CY |
341 | struct qstr dot = QSTR_INIT(".", 1); |
342 | struct qstr dotdot = QSTR_INIT("..", 2); | |
062a3e7b | 343 | |
291bf80b CY |
344 | /* update dirent of "." */ |
345 | f2fs_update_dentry(inode->i_ino, inode->i_mode, d, &dot, 0, 0); | |
062a3e7b | 346 | |
291bf80b CY |
347 | /* update dirent of ".." */ |
348 | f2fs_update_dentry(parent->i_ino, parent->i_mode, d, &dotdot, 0, 1); | |
062a3e7b JK |
349 | } |
350 | ||
44a83ff6 JK |
351 | static int make_empty_dir(struct inode *inode, |
352 | struct inode *parent, struct page *page) | |
39936837 JK |
353 | { |
354 | struct page *dentry_page; | |
355 | struct f2fs_dentry_block *dentry_blk; | |
062a3e7b | 356 | struct f2fs_dentry_ptr d; |
39936837 | 357 | |
622f28ae CY |
358 | if (f2fs_has_inline_dentry(inode)) |
359 | return make_empty_inline_dir(inode, parent, page); | |
360 | ||
44a83ff6 | 361 | dentry_page = get_new_data_page(inode, page, 0, true); |
39936837 JK |
362 | if (IS_ERR(dentry_page)) |
363 | return PTR_ERR(dentry_page); | |
364 | ||
1c3bb978 | 365 | dentry_blk = kmap_atomic(dentry_page); |
39936837 | 366 | |
d8c6822a | 367 | make_dentry_ptr(NULL, &d, (void *)dentry_blk, 1); |
062a3e7b | 368 | do_make_empty_dir(inode, parent, &d); |
39936837 | 369 | |
1c3bb978 | 370 | kunmap_atomic(dentry_blk); |
39936837 JK |
371 | |
372 | set_page_dirty(dentry_page); | |
373 | f2fs_put_page(dentry_page, 1); | |
374 | return 0; | |
375 | } | |
376 | ||
bce8d112 JK |
377 | struct page *init_inode_metadata(struct inode *inode, struct inode *dir, |
378 | const struct qstr *name, struct page *dpage) | |
6b4ea016 | 379 | { |
44a83ff6 JK |
380 | struct page *page; |
381 | int err; | |
382 | ||
91942321 | 383 | if (is_inode_flag_set(inode, FI_NEW_INODE)) { |
a014e037 | 384 | page = new_inode_page(inode); |
44a83ff6 JK |
385 | if (IS_ERR(page)) |
386 | return page; | |
6b4ea016 JK |
387 | |
388 | if (S_ISDIR(inode->i_mode)) { | |
221149c0 JK |
389 | /* in order to handle error case */ |
390 | get_page(page); | |
44a83ff6 | 391 | err = make_empty_dir(inode, dir, page); |
221149c0 JK |
392 | if (err) { |
393 | lock_page(page); | |
394 | goto put_error; | |
395 | } | |
396 | put_page(page); | |
6b4ea016 JK |
397 | } |
398 | ||
bce8d112 | 399 | err = f2fs_init_acl(inode, dir, page, dpage); |
44a83ff6 | 400 | if (err) |
a8865372 | 401 | goto put_error; |
44a83ff6 | 402 | |
8ae8f162 JK |
403 | err = f2fs_init_security(inode, dir, name, page); |
404 | if (err) | |
a8865372 | 405 | goto put_error; |
fcc85a4d JK |
406 | |
407 | if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode)) { | |
0b81d077 | 408 | err = fscrypt_inherit_context(dir, inode, page, false); |
fcc85a4d JK |
409 | if (err) |
410 | goto put_error; | |
411 | } | |
6b4ea016 | 412 | } else { |
4081363f | 413 | page = get_node_page(F2FS_I_SB(dir), inode->i_ino); |
44a83ff6 JK |
414 | if (IS_ERR(page)) |
415 | return page; | |
416 | ||
44a83ff6 | 417 | set_cold_node(inode, page); |
6b4ea016 | 418 | } |
44a83ff6 | 419 | |
b97a9b5d JK |
420 | if (name) |
421 | init_dent_inode(name, page); | |
44a83ff6 | 422 | |
83d5d6f6 JK |
423 | /* |
424 | * This file should be checkpointed during fsync. | |
425 | * We lost i_pino from now on. | |
426 | */ | |
91942321 | 427 | if (is_inode_flag_set(inode, FI_INC_LINK)) { |
354a3399 | 428 | file_lost_pino(inode); |
50732df0 CY |
429 | /* |
430 | * If link the tmpfile to alias through linkat path, | |
431 | * we should remove this inode from orphan list. | |
432 | */ | |
433 | if (inode->i_nlink == 0) | |
4081363f | 434 | remove_orphan_inode(F2FS_I_SB(dir), inode->i_ino); |
a1961246 | 435 | f2fs_i_links_write(inode, true); |
6b4ea016 | 436 | } |
44a83ff6 JK |
437 | return page; |
438 | ||
a8865372 | 439 | put_error: |
221149c0 JK |
440 | clear_nlink(inode); |
441 | update_inode(inode, page); | |
442 | f2fs_put_page(page, 1); | |
44a83ff6 | 443 | return ERR_PTR(err); |
6b4ea016 JK |
444 | } |
445 | ||
dbeacf02 | 446 | void update_parent_metadata(struct inode *dir, struct inode *inode, |
6b4ea016 JK |
447 | unsigned int current_depth) |
448 | { | |
91942321 | 449 | if (inode && is_inode_flag_set(inode, FI_NEW_INODE)) { |
ee6d182f | 450 | if (S_ISDIR(inode->i_mode)) |
a1961246 | 451 | f2fs_i_links_write(dir, true); |
91942321 | 452 | clear_inode_flag(inode, FI_NEW_INODE); |
6b4ea016 JK |
453 | } |
454 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; | |
b56ab837 | 455 | f2fs_mark_inode_dirty_sync(dir); |
a18ff063 | 456 | |
ee6d182f | 457 | if (F2FS_I(dir)->i_current_depth != current_depth) |
205b9822 | 458 | f2fs_i_depth_write(dir, current_depth); |
6b4ea016 | 459 | |
91942321 JK |
460 | if (inode && is_inode_flag_set(inode, FI_INC_LINK)) |
461 | clear_inode_flag(inode, FI_INC_LINK); | |
6b4ea016 JK |
462 | } |
463 | ||
a82afa20 | 464 | int room_for_filename(const void *bitmap, int slots, int max_slots) |
6b4ea016 JK |
465 | { |
466 | int bit_start = 0; | |
467 | int zero_start, zero_end; | |
468 | next: | |
a82afa20 JK |
469 | zero_start = find_next_zero_bit_le(bitmap, max_slots, bit_start); |
470 | if (zero_start >= max_slots) | |
471 | return max_slots; | |
472 | ||
473 | zero_end = find_next_bit_le(bitmap, max_slots, zero_start); | |
6b4ea016 JK |
474 | if (zero_end - zero_start >= slots) |
475 | return zero_start; | |
476 | ||
477 | bit_start = zero_end + 1; | |
478 | ||
a82afa20 JK |
479 | if (zero_end + 1 >= max_slots) |
480 | return max_slots; | |
6b4ea016 JK |
481 | goto next; |
482 | } | |
483 | ||
510022a8 | 484 | void f2fs_update_dentry(nid_t ino, umode_t mode, struct f2fs_dentry_ptr *d, |
3b4d732a CY |
485 | const struct qstr *name, f2fs_hash_t name_hash, |
486 | unsigned int bit_pos) | |
487 | { | |
488 | struct f2fs_dir_entry *de; | |
489 | int slots = GET_DENTRY_SLOTS(name->len); | |
490 | int i; | |
491 | ||
492 | de = &d->dentry[bit_pos]; | |
493 | de->hash_code = name_hash; | |
494 | de->name_len = cpu_to_le16(name->len); | |
495 | memcpy(d->filename[bit_pos], name->name, name->len); | |
510022a8 JK |
496 | de->ino = cpu_to_le32(ino); |
497 | set_de_type(de, mode); | |
7d9dfa1d | 498 | for (i = 0; i < slots; i++) { |
3b4d732a | 499 | test_and_set_bit_le(bit_pos + i, (void *)d->bitmap); |
7d9dfa1d JK |
500 | /* avoid wrong garbage data for readdir */ |
501 | if (i) | |
502 | (de + i)->name_len = 0; | |
503 | } | |
3b4d732a CY |
504 | } |
505 | ||
675f10bd | 506 | int f2fs_add_regular_entry(struct inode *dir, const struct qstr *new_name, |
510022a8 | 507 | struct inode *inode, nid_t ino, umode_t mode) |
6b4ea016 JK |
508 | { |
509 | unsigned int bit_pos; | |
510 | unsigned int level; | |
511 | unsigned int current_depth; | |
512 | unsigned long bidx, block; | |
513 | f2fs_hash_t dentry_hash; | |
6b4ea016 | 514 | unsigned int nbucket, nblock; |
6b4ea016 JK |
515 | struct page *dentry_page = NULL; |
516 | struct f2fs_dentry_block *dentry_blk = NULL; | |
3b4d732a | 517 | struct f2fs_dentry_ptr d; |
510022a8 | 518 | struct page *page = NULL; |
675f10bd | 519 | int slots, err = 0; |
622f28ae | 520 | |
6b4ea016 | 521 | level = 0; |
675f10bd CY |
522 | slots = GET_DENTRY_SLOTS(new_name->len); |
523 | dentry_hash = f2fs_dentry_hash(new_name); | |
9ea97163 | 524 | |
6b4ea016 JK |
525 | current_depth = F2FS_I(dir)->i_current_depth; |
526 | if (F2FS_I(dir)->chash == dentry_hash) { | |
527 | level = F2FS_I(dir)->clevel; | |
528 | F2FS_I(dir)->chash = 0; | |
529 | } | |
530 | ||
531 | start: | |
cb78942b JK |
532 | #ifdef CONFIG_F2FS_FAULT_INJECTION |
533 | if (time_to_inject(FAULT_DIR_DEPTH)) | |
534 | return -ENOSPC; | |
535 | #endif | |
675f10bd CY |
536 | if (unlikely(current_depth == MAX_DIR_HASH_DEPTH)) |
537 | return -ENOSPC; | |
6b4ea016 JK |
538 | |
539 | /* Increase the depth, if required */ | |
540 | if (level == current_depth) | |
541 | ++current_depth; | |
542 | ||
38431545 | 543 | nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level); |
6b4ea016 JK |
544 | nblock = bucket_blocks(level); |
545 | ||
38431545 JK |
546 | bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level, |
547 | (le32_to_cpu(dentry_hash) % nbucket)); | |
6b4ea016 JK |
548 | |
549 | for (block = bidx; block <= (bidx + nblock - 1); block++) { | |
64aa7ed9 | 550 | dentry_page = get_new_data_page(dir, NULL, block, true); |
675f10bd CY |
551 | if (IS_ERR(dentry_page)) |
552 | return PTR_ERR(dentry_page); | |
6b4ea016 JK |
553 | |
554 | dentry_blk = kmap(dentry_page); | |
a82afa20 JK |
555 | bit_pos = room_for_filename(&dentry_blk->dentry_bitmap, |
556 | slots, NR_DENTRY_IN_BLOCK); | |
6b4ea016 JK |
557 | if (bit_pos < NR_DENTRY_IN_BLOCK) |
558 | goto add_dentry; | |
559 | ||
560 | kunmap(dentry_page); | |
561 | f2fs_put_page(dentry_page, 1); | |
6b4ea016 JK |
562 | } |
563 | ||
564 | /* Move to next level to find the empty slot for new dentry */ | |
565 | ++level; | |
566 | goto start; | |
567 | add_dentry: | |
fec1d657 | 568 | f2fs_wait_on_page_writeback(dentry_page, DATA, true); |
6b4ea016 | 569 | |
510022a8 JK |
570 | if (inode) { |
571 | down_write(&F2FS_I(inode)->i_sem); | |
675f10bd | 572 | page = init_inode_metadata(inode, dir, new_name, NULL); |
510022a8 JK |
573 | if (IS_ERR(page)) { |
574 | err = PTR_ERR(page); | |
575 | goto fail; | |
576 | } | |
e7d55452 JK |
577 | if (f2fs_encrypted_inode(dir)) |
578 | file_set_enc_name(inode); | |
44a83ff6 | 579 | } |
3b4d732a | 580 | |
d8c6822a | 581 | make_dentry_ptr(NULL, &d, (void *)dentry_blk, 1); |
675f10bd | 582 | f2fs_update_dentry(ino, mode, &d, new_name, dentry_hash, bit_pos); |
3b4d732a | 583 | |
6b4ea016 | 584 | set_page_dirty(dentry_page); |
6666e6aa | 585 | |
510022a8 | 586 | if (inode) { |
205b9822 | 587 | f2fs_i_pino_write(inode, dir->i_ino); |
510022a8 JK |
588 | f2fs_put_page(page, 1); |
589 | } | |
44a83ff6 JK |
590 | |
591 | update_parent_metadata(dir, inode, current_depth); | |
6b4ea016 | 592 | fail: |
510022a8 JK |
593 | if (inode) |
594 | up_write(&F2FS_I(inode)->i_sem); | |
d928bfbf | 595 | |
6b4ea016 JK |
596 | kunmap(dentry_page); |
597 | f2fs_put_page(dentry_page, 1); | |
675f10bd CY |
598 | |
599 | return err; | |
600 | } | |
601 | ||
602 | /* | |
603 | * Caller should grab and release a rwsem by calling f2fs_lock_op() and | |
604 | * f2fs_unlock_op(). | |
605 | */ | |
606 | int __f2fs_add_link(struct inode *dir, const struct qstr *name, | |
607 | struct inode *inode, nid_t ino, umode_t mode) | |
608 | { | |
609 | struct fscrypt_name fname; | |
610 | struct qstr new_name; | |
611 | int err; | |
612 | ||
613 | err = fscrypt_setup_filename(dir, name, 0, &fname); | |
614 | if (err) | |
615 | return err; | |
616 | ||
617 | new_name.name = fname_name(&fname); | |
618 | new_name.len = fname_len(&fname); | |
619 | ||
620 | err = -EAGAIN; | |
621 | if (f2fs_has_inline_dentry(dir)) | |
622 | err = f2fs_add_inline_entry(dir, &new_name, inode, ino, mode); | |
623 | if (err == -EAGAIN) | |
624 | err = f2fs_add_regular_entry(dir, &new_name, inode, ino, mode); | |
625 | ||
0b81d077 | 626 | fscrypt_free_filename(&fname); |
d0239e1b | 627 | f2fs_update_time(F2FS_I_SB(dir), REQ_TIME); |
6b4ea016 JK |
628 | return err; |
629 | } | |
630 | ||
b97a9b5d JK |
631 | int f2fs_do_tmpfile(struct inode *inode, struct inode *dir) |
632 | { | |
633 | struct page *page; | |
634 | int err = 0; | |
635 | ||
636 | down_write(&F2FS_I(inode)->i_sem); | |
bce8d112 | 637 | page = init_inode_metadata(inode, dir, NULL, NULL); |
b97a9b5d JK |
638 | if (IS_ERR(page)) { |
639 | err = PTR_ERR(page); | |
640 | goto fail; | |
641 | } | |
b97a9b5d JK |
642 | f2fs_put_page(page, 1); |
643 | ||
91942321 | 644 | clear_inode_flag(inode, FI_NEW_INODE); |
b97a9b5d JK |
645 | fail: |
646 | up_write(&F2FS_I(inode)->i_sem); | |
d0239e1b | 647 | f2fs_update_time(F2FS_I_SB(inode), REQ_TIME); |
b97a9b5d JK |
648 | return err; |
649 | } | |
650 | ||
9f7c45cc | 651 | void f2fs_drop_nlink(struct inode *dir, struct inode *inode) |
dbeacf02 CY |
652 | { |
653 | struct f2fs_sb_info *sbi = F2FS_I_SB(dir); | |
654 | ||
655 | down_write(&F2FS_I(inode)->i_sem); | |
656 | ||
ee6d182f | 657 | if (S_ISDIR(inode->i_mode)) |
a1961246 | 658 | f2fs_i_links_write(dir, false); |
dbeacf02 CY |
659 | inode->i_ctime = CURRENT_TIME; |
660 | ||
a1961246 | 661 | f2fs_i_links_write(inode, false); |
dbeacf02 | 662 | if (S_ISDIR(inode->i_mode)) { |
a1961246 | 663 | f2fs_i_links_write(inode, false); |
fc9581c8 | 664 | f2fs_i_size_write(inode, 0); |
dbeacf02 CY |
665 | } |
666 | up_write(&F2FS_I(inode)->i_sem); | |
dbeacf02 CY |
667 | |
668 | if (inode->i_nlink == 0) | |
67c3758d | 669 | add_orphan_inode(inode); |
dbeacf02 CY |
670 | else |
671 | release_orphan_inode(sbi); | |
672 | } | |
673 | ||
0a8165d7 | 674 | /* |
e1c42045 | 675 | * It only removes the dentry from the dentry page, corresponding name |
6b4ea016 JK |
676 | * entry in name page does not need to be touched during deletion. |
677 | */ | |
678 | void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page, | |
dbeacf02 | 679 | struct inode *dir, struct inode *inode) |
6b4ea016 JK |
680 | { |
681 | struct f2fs_dentry_block *dentry_blk; | |
682 | unsigned int bit_pos; | |
457d08ee | 683 | int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len)); |
6b4ea016 JK |
684 | int i; |
685 | ||
d0239e1b JK |
686 | f2fs_update_time(F2FS_I_SB(dir), REQ_TIME); |
687 | ||
622f28ae CY |
688 | if (f2fs_has_inline_dentry(dir)) |
689 | return f2fs_delete_inline_entry(dentry, page, dir, inode); | |
690 | ||
6b4ea016 | 691 | lock_page(page); |
fec1d657 | 692 | f2fs_wait_on_page_writeback(page, DATA, true); |
6b4ea016 | 693 | |
1c3bb978 GZ |
694 | dentry_blk = page_address(page); |
695 | bit_pos = dentry - dentry_blk->dentry; | |
6b4ea016 | 696 | for (i = 0; i < slots; i++) |
1f7732fe | 697 | clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap); |
6b4ea016 JK |
698 | |
699 | /* Let's check and deallocate this dentry page */ | |
700 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
701 | NR_DENTRY_IN_BLOCK, | |
702 | 0); | |
703 | kunmap(page); /* kunmap - pair of f2fs_find_entry */ | |
704 | set_page_dirty(page); | |
705 | ||
706 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; | |
b56ab837 | 707 | f2fs_mark_inode_dirty_sync(dir); |
6b4ea016 | 708 | |
dbeacf02 | 709 | if (inode) |
9f7c45cc | 710 | f2fs_drop_nlink(dir, inode); |
6b4ea016 | 711 | |
206e61be CY |
712 | if (bit_pos == NR_DENTRY_IN_BLOCK && |
713 | !truncate_hole(dir, page->index, page->index + 1)) { | |
6b4ea016 | 714 | clear_page_dirty_for_io(page); |
2bca1e23 | 715 | ClearPagePrivate(page); |
6b4ea016 | 716 | ClearPageUptodate(page); |
a7ffdbe2 | 717 | inode_dec_dirty_pages(dir); |
6b4ea016 | 718 | } |
508198be | 719 | f2fs_put_page(page, 1); |
6b4ea016 JK |
720 | } |
721 | ||
722 | bool f2fs_empty_dir(struct inode *dir) | |
723 | { | |
724 | unsigned long bidx; | |
725 | struct page *dentry_page; | |
726 | unsigned int bit_pos; | |
dbeacf02 | 727 | struct f2fs_dentry_block *dentry_blk; |
6b4ea016 JK |
728 | unsigned long nblock = dir_blocks(dir); |
729 | ||
622f28ae CY |
730 | if (f2fs_has_inline_dentry(dir)) |
731 | return f2fs_empty_inline_dir(dir); | |
732 | ||
6b4ea016 | 733 | for (bidx = 0; bidx < nblock; bidx++) { |
a56c7c6f | 734 | dentry_page = get_lock_data_page(dir, bidx, false); |
6b4ea016 JK |
735 | if (IS_ERR(dentry_page)) { |
736 | if (PTR_ERR(dentry_page) == -ENOENT) | |
737 | continue; | |
738 | else | |
739 | return false; | |
740 | } | |
741 | ||
1c3bb978 | 742 | dentry_blk = kmap_atomic(dentry_page); |
6b4ea016 JK |
743 | if (bidx == 0) |
744 | bit_pos = 2; | |
745 | else | |
746 | bit_pos = 0; | |
747 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
748 | NR_DENTRY_IN_BLOCK, | |
749 | bit_pos); | |
1c3bb978 | 750 | kunmap_atomic(dentry_blk); |
6b4ea016 JK |
751 | |
752 | f2fs_put_page(dentry_page, 1); | |
753 | ||
754 | if (bit_pos < NR_DENTRY_IN_BLOCK) | |
755 | return false; | |
756 | } | |
757 | return true; | |
758 | } | |
759 | ||
7b3cd7d6 | 760 | bool f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d, |
0b81d077 | 761 | unsigned int start_pos, struct fscrypt_str *fstr) |
38594de7 JK |
762 | { |
763 | unsigned char d_type = DT_UNKNOWN; | |
764 | unsigned int bit_pos; | |
765 | struct f2fs_dir_entry *de = NULL; | |
0b81d077 | 766 | struct fscrypt_str de_name = FSTR_INIT(NULL, 0); |
38594de7 | 767 | |
7b3cd7d6 | 768 | bit_pos = ((unsigned long)ctx->pos % d->max); |
38594de7 | 769 | |
7b3cd7d6 JK |
770 | while (bit_pos < d->max) { |
771 | bit_pos = find_next_bit_le(d->bitmap, d->max, bit_pos); | |
772 | if (bit_pos >= d->max) | |
38594de7 JK |
773 | break; |
774 | ||
7b3cd7d6 | 775 | de = &d->dentry[bit_pos]; |
7d9dfa1d JK |
776 | if (de->name_len == 0) { |
777 | bit_pos++; | |
778 | ctx->pos = start_pos + bit_pos; | |
779 | continue; | |
780 | } | |
781 | ||
675f10bd | 782 | d_type = get_de_type(de); |
d8c6822a | 783 | |
d8c6822a JK |
784 | de_name.name = d->filename[bit_pos]; |
785 | de_name.len = le16_to_cpu(de->name_len); | |
786 | ||
787 | if (f2fs_encrypted_inode(d->inode)) { | |
788 | int save_len = fstr->len; | |
789 | int ret; | |
790 | ||
0414b004 | 791 | de_name.name = f2fs_kmalloc(de_name.len, GFP_NOFS); |
569cf187 JK |
792 | if (!de_name.name) |
793 | return false; | |
794 | ||
795 | memcpy(de_name.name, d->filename[bit_pos], de_name.len); | |
796 | ||
0b81d077 JK |
797 | ret = fscrypt_fname_disk_to_usr(d->inode, |
798 | (u32)de->hash_code, 0, | |
799 | &de_name, fstr); | |
569cf187 | 800 | kfree(de_name.name); |
d8c6822a JK |
801 | if (ret < 0) |
802 | return true; | |
569cf187 JK |
803 | |
804 | de_name = *fstr; | |
805 | fstr->len = save_len; | |
d8c6822a JK |
806 | } |
807 | ||
808 | if (!dir_emit(ctx, de_name.name, de_name.len, | |
38594de7 JK |
809 | le32_to_cpu(de->ino), d_type)) |
810 | return true; | |
811 | ||
812 | bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len)); | |
813 | ctx->pos = start_pos + bit_pos; | |
814 | } | |
815 | return false; | |
816 | } | |
817 | ||
6f7f231e | 818 | static int f2fs_readdir(struct file *file, struct dir_context *ctx) |
6b4ea016 | 819 | { |
496ad9aa | 820 | struct inode *inode = file_inode(file); |
6b4ea016 | 821 | unsigned long npages = dir_blocks(inode); |
6b4ea016 | 822 | struct f2fs_dentry_block *dentry_blk = NULL; |
6b4ea016 | 823 | struct page *dentry_page = NULL; |
817202d9 | 824 | struct file_ra_state *ra = &file->f_ra; |
6f7f231e | 825 | unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK); |
7b3cd7d6 | 826 | struct f2fs_dentry_ptr d; |
0b81d077 | 827 | struct fscrypt_str fstr = FSTR_INIT(NULL, 0); |
d8c6822a | 828 | int err = 0; |
6b4ea016 | 829 | |
d8c6822a | 830 | if (f2fs_encrypted_inode(inode)) { |
0b81d077 | 831 | err = fscrypt_get_encryption_info(inode); |
8074bb51 | 832 | if (err && err != -ENOKEY) |
26bf3dc7 JK |
833 | return err; |
834 | ||
0b81d077 | 835 | err = fscrypt_fname_alloc_buffer(inode, F2FS_NAME_LEN, &fstr); |
d8c6822a JK |
836 | if (err < 0) |
837 | return err; | |
838 | } | |
839 | ||
840 | if (f2fs_has_inline_dentry(inode)) { | |
841 | err = f2fs_read_inline_dir(file, ctx, &fstr); | |
842 | goto out; | |
843 | } | |
622f28ae | 844 | |
817202d9 CY |
845 | /* readahead for multi pages of dir */ |
846 | if (npages - n > 1 && !ra_has_index(ra, n)) | |
847 | page_cache_sync_readahead(inode->i_mapping, ra, file, n, | |
848 | min(npages - n, (pgoff_t)MAX_DIR_RA_PAGES)); | |
849 | ||
6c311ec6 | 850 | for (; n < npages; n++) { |
a56c7c6f | 851 | dentry_page = get_lock_data_page(inode, n, false); |
57b62d29 CY |
852 | if (IS_ERR(dentry_page)) { |
853 | err = PTR_ERR(dentry_page); | |
854 | if (err == -ENOENT) | |
855 | continue; | |
856 | else | |
857 | goto out; | |
858 | } | |
6b4ea016 | 859 | |
6b4ea016 | 860 | dentry_blk = kmap(dentry_page); |
99b072bb | 861 | |
d8c6822a | 862 | make_dentry_ptr(inode, &d, (void *)dentry_blk, 1); |
7b3cd7d6 | 863 | |
e9837bc2 CY |
864 | if (f2fs_fill_dentries(ctx, &d, n * NR_DENTRY_IN_BLOCK, &fstr)) { |
865 | kunmap(dentry_page); | |
866 | f2fs_put_page(dentry_page, 1); | |
867 | break; | |
868 | } | |
38594de7 | 869 | |
6f7f231e | 870 | ctx->pos = (n + 1) * NR_DENTRY_IN_BLOCK; |
6b4ea016 JK |
871 | kunmap(dentry_page); |
872 | f2fs_put_page(dentry_page, 1); | |
6b4ea016 | 873 | } |
fe216c7a | 874 | err = 0; |
d8c6822a | 875 | out: |
0b81d077 | 876 | fscrypt_fname_free_buffer(&fstr); |
d8c6822a | 877 | return err; |
6b4ea016 JK |
878 | } |
879 | ||
ed3360ab CY |
880 | static int f2fs_dir_open(struct inode *inode, struct file *filp) |
881 | { | |
882 | if (f2fs_encrypted_inode(inode)) | |
0b81d077 | 883 | return fscrypt_get_encryption_info(inode) ? -EACCES : 0; |
ed3360ab CY |
884 | return 0; |
885 | } | |
886 | ||
6b4ea016 JK |
887 | const struct file_operations f2fs_dir_operations = { |
888 | .llseek = generic_file_llseek, | |
889 | .read = generic_read_dir, | |
e77d0c63 | 890 | .iterate_shared = f2fs_readdir, |
6b4ea016 | 891 | .fsync = f2fs_sync_file, |
ed3360ab | 892 | .open = f2fs_dir_open, |
6b4ea016 | 893 | .unlocked_ioctl = f2fs_ioctl, |
08b95126 | 894 | #ifdef CONFIG_COMPAT |
895 | .compat_ioctl = f2fs_compat_ioctl, | |
896 | #endif | |
6b4ea016 | 897 | }; |