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> | |
4414dea8 | 13 | #include <linux/sched/signal.h> |
6b4ea016 | 14 | #include "f2fs.h" |
398b1ac5 | 15 | #include "node.h" |
6b4ea016 | 16 | #include "acl.h" |
8ae8f162 | 17 | #include "xattr.h" |
e97a3c4c | 18 | #include <trace/events/f2fs.h> |
6b4ea016 JK |
19 | |
20 | static unsigned long dir_blocks(struct inode *inode) | |
21 | { | |
09cbfeaf KS |
22 | return ((unsigned long long) (i_size_read(inode) + PAGE_SIZE - 1)) |
23 | >> PAGE_SHIFT; | |
6b4ea016 JK |
24 | } |
25 | ||
38431545 | 26 | static unsigned int dir_buckets(unsigned int level, int dir_level) |
6b4ea016 | 27 | { |
bfec07d0 | 28 | if (level + dir_level < MAX_DIR_HASH_DEPTH / 2) |
38431545 | 29 | return 1 << (level + dir_level); |
6b4ea016 | 30 | else |
bfec07d0 | 31 | return MAX_DIR_BUCKETS; |
6b4ea016 JK |
32 | } |
33 | ||
34 | static unsigned int bucket_blocks(unsigned int level) | |
35 | { | |
36 | if (level < MAX_DIR_HASH_DEPTH / 2) | |
37 | return 2; | |
38 | else | |
39 | return 4; | |
40 | } | |
41 | ||
ebfa7322 | 42 | static unsigned char f2fs_filetype_table[F2FS_FT_MAX] = { |
6b4ea016 JK |
43 | [F2FS_FT_UNKNOWN] = DT_UNKNOWN, |
44 | [F2FS_FT_REG_FILE] = DT_REG, | |
45 | [F2FS_FT_DIR] = DT_DIR, | |
46 | [F2FS_FT_CHRDEV] = DT_CHR, | |
47 | [F2FS_FT_BLKDEV] = DT_BLK, | |
48 | [F2FS_FT_FIFO] = DT_FIFO, | |
49 | [F2FS_FT_SOCK] = DT_SOCK, | |
50 | [F2FS_FT_SYMLINK] = DT_LNK, | |
51 | }; | |
52 | ||
6b4ea016 JK |
53 | static unsigned char f2fs_type_by_mode[S_IFMT >> S_SHIFT] = { |
54 | [S_IFREG >> S_SHIFT] = F2FS_FT_REG_FILE, | |
55 | [S_IFDIR >> S_SHIFT] = F2FS_FT_DIR, | |
56 | [S_IFCHR >> S_SHIFT] = F2FS_FT_CHRDEV, | |
57 | [S_IFBLK >> S_SHIFT] = F2FS_FT_BLKDEV, | |
58 | [S_IFIFO >> S_SHIFT] = F2FS_FT_FIFO, | |
59 | [S_IFSOCK >> S_SHIFT] = F2FS_FT_SOCK, | |
60 | [S_IFLNK >> S_SHIFT] = F2FS_FT_SYMLINK, | |
61 | }; | |
62 | ||
510022a8 | 63 | void set_de_type(struct f2fs_dir_entry *de, umode_t mode) |
6b4ea016 | 64 | { |
6b4ea016 JK |
65 | de->file_type = f2fs_type_by_mode[(mode & S_IFMT) >> S_SHIFT]; |
66 | } | |
67 | ||
675f10bd CY |
68 | unsigned char get_de_type(struct f2fs_dir_entry *de) |
69 | { | |
70 | if (de->file_type < F2FS_FT_MAX) | |
71 | return f2fs_filetype_table[de->file_type]; | |
72 | return DT_UNKNOWN; | |
73 | } | |
74 | ||
38431545 JK |
75 | static unsigned long dir_block_index(unsigned int level, |
76 | int dir_level, unsigned int idx) | |
6b4ea016 JK |
77 | { |
78 | unsigned long i; | |
79 | unsigned long bidx = 0; | |
80 | ||
81 | for (i = 0; i < level; i++) | |
38431545 | 82 | bidx += dir_buckets(i, dir_level) * bucket_blocks(i); |
6b4ea016 JK |
83 | bidx += idx * bucket_blocks(level); |
84 | return bidx; | |
85 | } | |
86 | ||
6b4ea016 | 87 | static struct f2fs_dir_entry *find_in_block(struct page *dentry_page, |
0b81d077 | 88 | struct fscrypt_name *fname, |
6e22c691 JK |
89 | f2fs_hash_t namehash, |
90 | int *max_slots, | |
4e6ebf6d JK |
91 | struct page **res_page) |
92 | { | |
93 | struct f2fs_dentry_block *dentry_blk; | |
94 | struct f2fs_dir_entry *de; | |
7b3cd7d6 | 95 | struct f2fs_dentry_ptr d; |
4e6ebf6d | 96 | |
bdbc90fa | 97 | dentry_blk = (struct f2fs_dentry_block *)page_address(dentry_page); |
7b3cd7d6 | 98 | |
64c24ecb | 99 | make_dentry_ptr_block(NULL, &d, dentry_blk); |
6e22c691 | 100 | de = find_target_dentry(fname, namehash, max_slots, &d); |
4e6ebf6d JK |
101 | if (de) |
102 | *res_page = dentry_page; | |
4e6ebf6d | 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; |
6b4ea016 | 114 | |
7b3cd7d6 JK |
115 | if (max_slots) |
116 | *max_slots = 0; | |
117 | while (bit_pos < d->max) { | |
118 | if (!test_bit_le(bit_pos, d->bitmap)) { | |
5d0c6671 | 119 | bit_pos++; |
bda19076 | 120 | max_len++; |
5d0c6671 JK |
121 | continue; |
122 | } | |
bda19076 | 123 | |
7b3cd7d6 | 124 | de = &d->dentry[bit_pos]; |
6e22c691 | 125 | |
a4a13f58 CY |
126 | if (unlikely(!de->name_len)) { |
127 | bit_pos++; | |
128 | continue; | |
129 | } | |
130 | ||
1f73d491 EB |
131 | if (de->hash_code == namehash && |
132 | fscrypt_match_name(fname, d->filename[bit_pos], | |
133 | le16_to_cpu(de->name_len))) | |
4e6ebf6d | 134 | goto found; |
1f73d491 | 135 | |
bda19076 | 136 | if (max_slots && max_len > *max_slots) |
5d0c6671 | 137 | *max_slots = max_len; |
bda19076 | 138 | max_len = 0; |
81e366f8 | 139 | |
5d0c6671 | 140 | bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len)); |
6b4ea016 JK |
141 | } |
142 | ||
143 | de = NULL; | |
6b4ea016 | 144 | found: |
7b3cd7d6 | 145 | if (max_slots && max_len > *max_slots) |
5d0c6671 | 146 | *max_slots = max_len; |
6b4ea016 JK |
147 | return de; |
148 | } | |
149 | ||
150 | static struct f2fs_dir_entry *find_in_level(struct inode *dir, | |
6e22c691 | 151 | unsigned int level, |
0b81d077 | 152 | struct fscrypt_name *fname, |
6e22c691 | 153 | struct page **res_page) |
6b4ea016 | 154 | { |
6e22c691 JK |
155 | struct qstr name = FSTR_TO_QSTR(&fname->disk_name); |
156 | int s = GET_DENTRY_SLOTS(name.len); | |
6b4ea016 JK |
157 | unsigned int nbucket, nblock; |
158 | unsigned int bidx, end_block; | |
159 | struct page *dentry_page; | |
160 | struct f2fs_dir_entry *de = NULL; | |
161 | bool room = false; | |
4e6ebf6d | 162 | int max_slots; |
6332cd32 | 163 | f2fs_hash_t namehash = f2fs_dentry_hash(&name, fname); |
6b4ea016 | 164 | |
38431545 | 165 | nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level); |
6b4ea016 JK |
166 | nblock = bucket_blocks(level); |
167 | ||
38431545 JK |
168 | bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level, |
169 | le32_to_cpu(namehash) % nbucket); | |
6b4ea016 JK |
170 | end_block = bidx + nblock; |
171 | ||
172 | for (; bidx < end_block; bidx++) { | |
173 | /* no need to allocate new dentry pages to all the indices */ | |
43f3eae1 | 174 | dentry_page = find_data_page(dir, bidx); |
6b4ea016 | 175 | if (IS_ERR(dentry_page)) { |
42d96401 JK |
176 | if (PTR_ERR(dentry_page) == -ENOENT) { |
177 | room = true; | |
178 | continue; | |
179 | } else { | |
180 | *res_page = dentry_page; | |
181 | break; | |
182 | } | |
6b4ea016 JK |
183 | } |
184 | ||
6e22c691 JK |
185 | de = find_in_block(dentry_page, fname, namehash, &max_slots, |
186 | res_page); | |
6b4ea016 JK |
187 | if (de) |
188 | break; | |
189 | ||
190 | if (max_slots >= s) | |
191 | room = true; | |
192 | f2fs_put_page(dentry_page, 0); | |
193 | } | |
194 | ||
d3bb910c SY |
195 | if (!de && room && F2FS_I(dir)->chash != namehash) { |
196 | F2FS_I(dir)->chash = namehash; | |
197 | F2FS_I(dir)->clevel = level; | |
6b4ea016 JK |
198 | } |
199 | ||
200 | return de; | |
201 | } | |
202 | ||
e7ba108a SL |
203 | struct f2fs_dir_entry *__f2fs_find_entry(struct inode *dir, |
204 | struct fscrypt_name *fname, struct page **res_page) | |
6b4ea016 | 205 | { |
6b4ea016 JK |
206 | unsigned long npages = dir_blocks(dir); |
207 | struct f2fs_dir_entry *de = NULL; | |
6b4ea016 JK |
208 | unsigned int max_depth; |
209 | unsigned int level; | |
6e22c691 JK |
210 | |
211 | if (f2fs_has_inline_dentry(dir)) { | |
42d96401 | 212 | *res_page = NULL; |
e7ba108a | 213 | de = find_in_inline_dir(dir, fname, res_page); |
6e22c691 JK |
214 | goto out; |
215 | } | |
622f28ae | 216 | |
42d96401 JK |
217 | if (npages == 0) { |
218 | *res_page = NULL; | |
6e22c691 | 219 | goto out; |
42d96401 | 220 | } |
6b4ea016 | 221 | |
6b4ea016 | 222 | max_depth = F2FS_I(dir)->i_current_depth; |
1f6fa261 JK |
223 | if (unlikely(max_depth > MAX_DIR_HASH_DEPTH)) { |
224 | f2fs_msg(F2FS_I_SB(dir)->sb, KERN_WARNING, | |
225 | "Corrupted max_depth of %lu: %u", | |
226 | dir->i_ino, max_depth); | |
227 | max_depth = MAX_DIR_HASH_DEPTH; | |
205b9822 | 228 | f2fs_i_depth_write(dir, max_depth); |
1f6fa261 | 229 | } |
6b4ea016 JK |
230 | |
231 | for (level = 0; level < max_depth; level++) { | |
42d96401 | 232 | *res_page = NULL; |
e7ba108a | 233 | de = find_in_level(dir, level, fname, res_page); |
42d96401 | 234 | if (de || IS_ERR(*res_page)) |
6b4ea016 JK |
235 | break; |
236 | } | |
6e22c691 | 237 | out: |
d3bb910c SY |
238 | /* This is to increase the speed of f2fs_create */ |
239 | if (!de) | |
240 | F2FS_I(dir)->task = current; | |
e7ba108a SL |
241 | return de; |
242 | } | |
243 | ||
244 | /* | |
245 | * Find an entry in the specified directory with the wanted name. | |
246 | * It returns the page where the entry was found (as a parameter - res_page), | |
247 | * and the entry itself. Page is returned mapped and unlocked. | |
248 | * Entry is guaranteed to be valid. | |
249 | */ | |
250 | struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir, | |
251 | const struct qstr *child, struct page **res_page) | |
252 | { | |
253 | struct f2fs_dir_entry *de = NULL; | |
254 | struct fscrypt_name fname; | |
255 | int err; | |
256 | ||
257 | err = fscrypt_setup_filename(dir, child, 1, &fname); | |
258 | if (err) { | |
54475f53 EB |
259 | if (err == -ENOENT) |
260 | *res_page = NULL; | |
261 | else | |
262 | *res_page = ERR_PTR(err); | |
e7ba108a SL |
263 | return NULL; |
264 | } | |
265 | ||
266 | de = __f2fs_find_entry(dir, &fname, res_page); | |
267 | ||
0b81d077 | 268 | fscrypt_free_filename(&fname); |
6b4ea016 JK |
269 | return de; |
270 | } | |
271 | ||
272 | struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p) | |
273 | { | |
8be0fea9 | 274 | struct qstr dotdot = QSTR_INIT("..", 2); |
622f28ae | 275 | |
8be0fea9 | 276 | return f2fs_find_entry(dir, &dotdot, p); |
6b4ea016 JK |
277 | } |
278 | ||
835c92d4 | 279 | ino_t f2fs_inode_by_name(struct inode *dir, const struct qstr *qstr, |
91246c21 | 280 | struct page **page) |
6b4ea016 JK |
281 | { |
282 | ino_t res = 0; | |
283 | struct f2fs_dir_entry *de; | |
6b4ea016 | 284 | |
91246c21 | 285 | de = f2fs_find_entry(dir, qstr, page); |
6b4ea016 JK |
286 | if (de) { |
287 | res = le32_to_cpu(de->ino); | |
91246c21 | 288 | f2fs_put_page(*page, 0); |
6b4ea016 JK |
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); |
6b4ea016 | 302 | set_page_dirty(page); |
6666e6aa | 303 | |
078cd827 | 304 | dir->i_mtime = dir->i_ctime = current_time(dir); |
7c45729a | 305 | f2fs_mark_inode_dirty_sync(dir, false); |
6b4ea016 | 306 | f2fs_put_page(page, 1); |
6b4ea016 JK |
307 | } |
308 | ||
44a83ff6 | 309 | static void init_dent_inode(const struct qstr *name, struct page *ipage) |
6b4ea016 | 310 | { |
58bfaf44 | 311 | struct f2fs_inode *ri; |
6b4ea016 | 312 | |
fec1d657 | 313 | f2fs_wait_on_page_writeback(ipage, NODE, true); |
54b591df | 314 | |
53dc9a67 | 315 | /* copy name info. to this inode page */ |
58bfaf44 JK |
316 | ri = F2FS_INODE(ipage); |
317 | ri->i_namelen = cpu_to_le32(name->len); | |
318 | memcpy(ri->i_name, name->name, name->len); | |
6b4ea016 JK |
319 | set_page_dirty(ipage); |
320 | } | |
321 | ||
062a3e7b JK |
322 | void do_make_empty_dir(struct inode *inode, struct inode *parent, |
323 | struct f2fs_dentry_ptr *d) | |
324 | { | |
291bf80b CY |
325 | struct qstr dot = QSTR_INIT(".", 1); |
326 | struct qstr dotdot = QSTR_INIT("..", 2); | |
062a3e7b | 327 | |
291bf80b CY |
328 | /* update dirent of "." */ |
329 | f2fs_update_dentry(inode->i_ino, inode->i_mode, d, &dot, 0, 0); | |
062a3e7b | 330 | |
291bf80b CY |
331 | /* update dirent of ".." */ |
332 | f2fs_update_dentry(parent->i_ino, parent->i_mode, d, &dotdot, 0, 1); | |
062a3e7b JK |
333 | } |
334 | ||
44a83ff6 JK |
335 | static int make_empty_dir(struct inode *inode, |
336 | struct inode *parent, struct page *page) | |
39936837 JK |
337 | { |
338 | struct page *dentry_page; | |
339 | struct f2fs_dentry_block *dentry_blk; | |
062a3e7b | 340 | struct f2fs_dentry_ptr d; |
39936837 | 341 | |
622f28ae CY |
342 | if (f2fs_has_inline_dentry(inode)) |
343 | return make_empty_inline_dir(inode, parent, page); | |
344 | ||
44a83ff6 | 345 | dentry_page = get_new_data_page(inode, page, 0, true); |
39936837 JK |
346 | if (IS_ERR(dentry_page)) |
347 | return PTR_ERR(dentry_page); | |
348 | ||
bdbc90fa | 349 | dentry_blk = page_address(dentry_page); |
39936837 | 350 | |
64c24ecb | 351 | make_dentry_ptr_block(NULL, &d, dentry_blk); |
062a3e7b | 352 | do_make_empty_dir(inode, parent, &d); |
39936837 | 353 | |
39936837 JK |
354 | set_page_dirty(dentry_page); |
355 | f2fs_put_page(dentry_page, 1); | |
356 | return 0; | |
357 | } | |
358 | ||
bce8d112 | 359 | struct page *init_inode_metadata(struct inode *inode, struct inode *dir, |
9421d570 CY |
360 | const struct qstr *new_name, const struct qstr *orig_name, |
361 | struct page *dpage) | |
6b4ea016 | 362 | { |
44a83ff6 | 363 | struct page *page; |
ff62af20 | 364 | int dummy_encrypt = DUMMY_ENCRYPTION_ENABLED(F2FS_I_SB(dir)); |
44a83ff6 JK |
365 | int err; |
366 | ||
91942321 | 367 | if (is_inode_flag_set(inode, FI_NEW_INODE)) { |
a014e037 | 368 | page = new_inode_page(inode); |
44a83ff6 JK |
369 | if (IS_ERR(page)) |
370 | return page; | |
6b4ea016 JK |
371 | |
372 | if (S_ISDIR(inode->i_mode)) { | |
221149c0 JK |
373 | /* in order to handle error case */ |
374 | get_page(page); | |
44a83ff6 | 375 | err = make_empty_dir(inode, dir, page); |
221149c0 JK |
376 | if (err) { |
377 | lock_page(page); | |
378 | goto put_error; | |
379 | } | |
380 | put_page(page); | |
6b4ea016 JK |
381 | } |
382 | ||
bce8d112 | 383 | err = f2fs_init_acl(inode, dir, page, dpage); |
44a83ff6 | 384 | if (err) |
a8865372 | 385 | goto put_error; |
44a83ff6 | 386 | |
9421d570 | 387 | err = f2fs_init_security(inode, dir, orig_name, page); |
8ae8f162 | 388 | if (err) |
a8865372 | 389 | goto put_error; |
fcc85a4d | 390 | |
ff62af20 SY |
391 | if ((f2fs_encrypted_inode(dir) || dummy_encrypt) && |
392 | f2fs_may_encrypt(inode)) { | |
0b81d077 | 393 | err = fscrypt_inherit_context(dir, inode, page, false); |
fcc85a4d JK |
394 | if (err) |
395 | goto put_error; | |
396 | } | |
6b4ea016 | 397 | } else { |
4081363f | 398 | page = get_node_page(F2FS_I_SB(dir), inode->i_ino); |
44a83ff6 JK |
399 | if (IS_ERR(page)) |
400 | return page; | |
6b4ea016 | 401 | } |
44a83ff6 | 402 | |
d03ba4cc | 403 | if (new_name) { |
9421d570 | 404 | init_dent_inode(new_name, page); |
d03ba4cc KM |
405 | if (f2fs_encrypted_inode(dir)) |
406 | file_set_enc_name(inode); | |
407 | } | |
44a83ff6 | 408 | |
83d5d6f6 JK |
409 | /* |
410 | * This file should be checkpointed during fsync. | |
411 | * We lost i_pino from now on. | |
412 | */ | |
91942321 | 413 | if (is_inode_flag_set(inode, FI_INC_LINK)) { |
d58dfb75 SY |
414 | if (!S_ISDIR(inode->i_mode)) |
415 | file_lost_pino(inode); | |
50732df0 CY |
416 | /* |
417 | * If link the tmpfile to alias through linkat path, | |
418 | * we should remove this inode from orphan list. | |
419 | */ | |
420 | if (inode->i_nlink == 0) | |
4081363f | 421 | remove_orphan_inode(F2FS_I_SB(dir), inode->i_ino); |
a1961246 | 422 | f2fs_i_links_write(inode, true); |
6b4ea016 | 423 | } |
44a83ff6 JK |
424 | return page; |
425 | ||
a8865372 | 426 | put_error: |
221149c0 JK |
427 | clear_nlink(inode); |
428 | update_inode(inode, page); | |
429 | f2fs_put_page(page, 1); | |
44a83ff6 | 430 | return ERR_PTR(err); |
6b4ea016 JK |
431 | } |
432 | ||
dbeacf02 | 433 | void update_parent_metadata(struct inode *dir, struct inode *inode, |
6b4ea016 JK |
434 | unsigned int current_depth) |
435 | { | |
91942321 | 436 | if (inode && is_inode_flag_set(inode, FI_NEW_INODE)) { |
ee6d182f | 437 | if (S_ISDIR(inode->i_mode)) |
a1961246 | 438 | f2fs_i_links_write(dir, true); |
91942321 | 439 | clear_inode_flag(inode, FI_NEW_INODE); |
6b4ea016 | 440 | } |
078cd827 | 441 | dir->i_mtime = dir->i_ctime = current_time(dir); |
7c45729a | 442 | f2fs_mark_inode_dirty_sync(dir, false); |
a18ff063 | 443 | |
ee6d182f | 444 | if (F2FS_I(dir)->i_current_depth != current_depth) |
205b9822 | 445 | f2fs_i_depth_write(dir, current_depth); |
6b4ea016 | 446 | |
91942321 JK |
447 | if (inode && is_inode_flag_set(inode, FI_INC_LINK)) |
448 | clear_inode_flag(inode, FI_INC_LINK); | |
6b4ea016 JK |
449 | } |
450 | ||
a82afa20 | 451 | int room_for_filename(const void *bitmap, int slots, int max_slots) |
6b4ea016 JK |
452 | { |
453 | int bit_start = 0; | |
454 | int zero_start, zero_end; | |
455 | next: | |
a82afa20 JK |
456 | zero_start = find_next_zero_bit_le(bitmap, max_slots, bit_start); |
457 | if (zero_start >= max_slots) | |
458 | return max_slots; | |
459 | ||
460 | zero_end = find_next_bit_le(bitmap, max_slots, zero_start); | |
6b4ea016 JK |
461 | if (zero_end - zero_start >= slots) |
462 | return zero_start; | |
463 | ||
464 | bit_start = zero_end + 1; | |
465 | ||
a82afa20 JK |
466 | if (zero_end + 1 >= max_slots) |
467 | return max_slots; | |
6b4ea016 JK |
468 | goto next; |
469 | } | |
470 | ||
510022a8 | 471 | void f2fs_update_dentry(nid_t ino, umode_t mode, struct f2fs_dentry_ptr *d, |
3b4d732a CY |
472 | const struct qstr *name, f2fs_hash_t name_hash, |
473 | unsigned int bit_pos) | |
474 | { | |
475 | struct f2fs_dir_entry *de; | |
476 | int slots = GET_DENTRY_SLOTS(name->len); | |
477 | int i; | |
478 | ||
479 | de = &d->dentry[bit_pos]; | |
480 | de->hash_code = name_hash; | |
481 | de->name_len = cpu_to_le16(name->len); | |
482 | memcpy(d->filename[bit_pos], name->name, name->len); | |
510022a8 JK |
483 | de->ino = cpu_to_le32(ino); |
484 | set_de_type(de, mode); | |
7d9dfa1d | 485 | for (i = 0; i < slots; i++) { |
6bf6b267 | 486 | __set_bit_le(bit_pos + i, (void *)d->bitmap); |
7d9dfa1d JK |
487 | /* avoid wrong garbage data for readdir */ |
488 | if (i) | |
489 | (de + i)->name_len = 0; | |
490 | } | |
3b4d732a CY |
491 | } |
492 | ||
675f10bd | 493 | int f2fs_add_regular_entry(struct inode *dir, const struct qstr *new_name, |
9421d570 | 494 | const struct qstr *orig_name, |
510022a8 | 495 | struct inode *inode, nid_t ino, umode_t mode) |
6b4ea016 JK |
496 | { |
497 | unsigned int bit_pos; | |
498 | unsigned int level; | |
499 | unsigned int current_depth; | |
500 | unsigned long bidx, block; | |
501 | f2fs_hash_t dentry_hash; | |
6b4ea016 | 502 | unsigned int nbucket, nblock; |
6b4ea016 JK |
503 | struct page *dentry_page = NULL; |
504 | struct f2fs_dentry_block *dentry_blk = NULL; | |
3b4d732a | 505 | struct f2fs_dentry_ptr d; |
510022a8 | 506 | struct page *page = NULL; |
675f10bd | 507 | int slots, err = 0; |
622f28ae | 508 | |
6b4ea016 | 509 | level = 0; |
675f10bd | 510 | slots = GET_DENTRY_SLOTS(new_name->len); |
6332cd32 | 511 | dentry_hash = f2fs_dentry_hash(new_name, NULL); |
9ea97163 | 512 | |
6b4ea016 JK |
513 | current_depth = F2FS_I(dir)->i_current_depth; |
514 | if (F2FS_I(dir)->chash == dentry_hash) { | |
515 | level = F2FS_I(dir)->clevel; | |
516 | F2FS_I(dir)->chash = 0; | |
517 | } | |
518 | ||
519 | start: | |
cb78942b | 520 | #ifdef CONFIG_F2FS_FAULT_INJECTION |
55523519 CY |
521 | if (time_to_inject(F2FS_I_SB(dir), FAULT_DIR_DEPTH)) { |
522 | f2fs_show_injection_info(FAULT_DIR_DEPTH); | |
cb78942b | 523 | return -ENOSPC; |
55523519 | 524 | } |
cb78942b | 525 | #endif |
675f10bd CY |
526 | if (unlikely(current_depth == MAX_DIR_HASH_DEPTH)) |
527 | return -ENOSPC; | |
6b4ea016 JK |
528 | |
529 | /* Increase the depth, if required */ | |
530 | if (level == current_depth) | |
531 | ++current_depth; | |
532 | ||
38431545 | 533 | nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level); |
6b4ea016 JK |
534 | nblock = bucket_blocks(level); |
535 | ||
38431545 JK |
536 | bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level, |
537 | (le32_to_cpu(dentry_hash) % nbucket)); | |
6b4ea016 JK |
538 | |
539 | for (block = bidx; block <= (bidx + nblock - 1); block++) { | |
64aa7ed9 | 540 | dentry_page = get_new_data_page(dir, NULL, block, true); |
675f10bd CY |
541 | if (IS_ERR(dentry_page)) |
542 | return PTR_ERR(dentry_page); | |
6b4ea016 | 543 | |
bdbc90fa | 544 | dentry_blk = page_address(dentry_page); |
a82afa20 JK |
545 | bit_pos = room_for_filename(&dentry_blk->dentry_bitmap, |
546 | slots, NR_DENTRY_IN_BLOCK); | |
6b4ea016 JK |
547 | if (bit_pos < NR_DENTRY_IN_BLOCK) |
548 | goto add_dentry; | |
549 | ||
6b4ea016 | 550 | f2fs_put_page(dentry_page, 1); |
6b4ea016 JK |
551 | } |
552 | ||
553 | /* Move to next level to find the empty slot for new dentry */ | |
554 | ++level; | |
555 | goto start; | |
556 | add_dentry: | |
fec1d657 | 557 | f2fs_wait_on_page_writeback(dentry_page, DATA, true); |
6b4ea016 | 558 | |
510022a8 JK |
559 | if (inode) { |
560 | down_write(&F2FS_I(inode)->i_sem); | |
9421d570 CY |
561 | page = init_inode_metadata(inode, dir, new_name, |
562 | orig_name, NULL); | |
510022a8 JK |
563 | if (IS_ERR(page)) { |
564 | err = PTR_ERR(page); | |
565 | goto fail; | |
566 | } | |
44a83ff6 | 567 | } |
3b4d732a | 568 | |
64c24ecb | 569 | make_dentry_ptr_block(NULL, &d, dentry_blk); |
675f10bd | 570 | f2fs_update_dentry(ino, mode, &d, new_name, dentry_hash, bit_pos); |
3b4d732a | 571 | |
6b4ea016 | 572 | set_page_dirty(dentry_page); |
6666e6aa | 573 | |
510022a8 | 574 | if (inode) { |
205b9822 | 575 | f2fs_i_pino_write(inode, dir->i_ino); |
510022a8 JK |
576 | f2fs_put_page(page, 1); |
577 | } | |
44a83ff6 JK |
578 | |
579 | update_parent_metadata(dir, inode, current_depth); | |
6b4ea016 | 580 | fail: |
510022a8 JK |
581 | if (inode) |
582 | up_write(&F2FS_I(inode)->i_sem); | |
d928bfbf | 583 | |
6b4ea016 | 584 | f2fs_put_page(dentry_page, 1); |
675f10bd CY |
585 | |
586 | return err; | |
587 | } | |
588 | ||
e7ba108a SL |
589 | int __f2fs_do_add_link(struct inode *dir, struct fscrypt_name *fname, |
590 | struct inode *inode, nid_t ino, umode_t mode) | |
591 | { | |
592 | struct qstr new_name; | |
593 | int err = -EAGAIN; | |
594 | ||
595 | new_name.name = fname_name(fname); | |
596 | new_name.len = fname_len(fname); | |
597 | ||
598 | if (f2fs_has_inline_dentry(dir)) | |
599 | err = f2fs_add_inline_entry(dir, &new_name, fname->usr_fname, | |
600 | inode, ino, mode); | |
601 | if (err == -EAGAIN) | |
602 | err = f2fs_add_regular_entry(dir, &new_name, fname->usr_fname, | |
603 | inode, ino, mode); | |
604 | ||
605 | f2fs_update_time(F2FS_I_SB(dir), REQ_TIME); | |
606 | return err; | |
607 | } | |
608 | ||
675f10bd CY |
609 | /* |
610 | * Caller should grab and release a rwsem by calling f2fs_lock_op() and | |
611 | * f2fs_unlock_op(). | |
612 | */ | |
613 | int __f2fs_add_link(struct inode *dir, const struct qstr *name, | |
614 | struct inode *inode, nid_t ino, umode_t mode) | |
615 | { | |
616 | struct fscrypt_name fname; | |
88c5c13a JK |
617 | struct page *page = NULL; |
618 | struct f2fs_dir_entry *de = NULL; | |
675f10bd CY |
619 | int err; |
620 | ||
621 | err = fscrypt_setup_filename(dir, name, 0, &fname); | |
622 | if (err) | |
623 | return err; | |
624 | ||
88c5c13a JK |
625 | /* |
626 | * An immature stakable filesystem shows a race condition between lookup | |
627 | * and create. If we have same task when doing lookup and create, it's | |
628 | * definitely fine as expected by VFS normally. Otherwise, let's just | |
629 | * verify on-disk dentry one more time, which guarantees filesystem | |
630 | * consistency more. | |
631 | */ | |
632 | if (current != F2FS_I(dir)->task) { | |
633 | de = __f2fs_find_entry(dir, &fname, &page); | |
634 | F2FS_I(dir)->task = NULL; | |
635 | } | |
636 | if (de) { | |
88c5c13a JK |
637 | f2fs_put_page(page, 0); |
638 | err = -EEXIST; | |
639 | } else if (IS_ERR(page)) { | |
640 | err = PTR_ERR(page); | |
641 | } else { | |
642 | err = __f2fs_do_add_link(dir, &fname, inode, ino, mode); | |
643 | } | |
0b81d077 | 644 | fscrypt_free_filename(&fname); |
6b4ea016 JK |
645 | return err; |
646 | } | |
647 | ||
b97a9b5d JK |
648 | int f2fs_do_tmpfile(struct inode *inode, struct inode *dir) |
649 | { | |
650 | struct page *page; | |
651 | int err = 0; | |
652 | ||
653 | down_write(&F2FS_I(inode)->i_sem); | |
9421d570 | 654 | page = init_inode_metadata(inode, dir, NULL, NULL, NULL); |
b97a9b5d JK |
655 | if (IS_ERR(page)) { |
656 | err = PTR_ERR(page); | |
657 | goto fail; | |
658 | } | |
b97a9b5d JK |
659 | f2fs_put_page(page, 1); |
660 | ||
91942321 | 661 | clear_inode_flag(inode, FI_NEW_INODE); |
b97a9b5d JK |
662 | fail: |
663 | up_write(&F2FS_I(inode)->i_sem); | |
d0239e1b | 664 | f2fs_update_time(F2FS_I_SB(inode), REQ_TIME); |
b97a9b5d JK |
665 | return err; |
666 | } | |
667 | ||
9f7c45cc | 668 | void f2fs_drop_nlink(struct inode *dir, struct inode *inode) |
dbeacf02 CY |
669 | { |
670 | struct f2fs_sb_info *sbi = F2FS_I_SB(dir); | |
671 | ||
672 | down_write(&F2FS_I(inode)->i_sem); | |
673 | ||
ee6d182f | 674 | if (S_ISDIR(inode->i_mode)) |
a1961246 | 675 | f2fs_i_links_write(dir, false); |
078cd827 | 676 | inode->i_ctime = current_time(inode); |
dbeacf02 | 677 | |
a1961246 | 678 | f2fs_i_links_write(inode, false); |
dbeacf02 | 679 | if (S_ISDIR(inode->i_mode)) { |
a1961246 | 680 | f2fs_i_links_write(inode, false); |
fc9581c8 | 681 | f2fs_i_size_write(inode, 0); |
dbeacf02 CY |
682 | } |
683 | up_write(&F2FS_I(inode)->i_sem); | |
dbeacf02 CY |
684 | |
685 | if (inode->i_nlink == 0) | |
67c3758d | 686 | add_orphan_inode(inode); |
dbeacf02 CY |
687 | else |
688 | release_orphan_inode(sbi); | |
689 | } | |
690 | ||
0a8165d7 | 691 | /* |
e1c42045 | 692 | * It only removes the dentry from the dentry page, corresponding name |
6b4ea016 JK |
693 | * entry in name page does not need to be touched during deletion. |
694 | */ | |
695 | void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page, | |
dbeacf02 | 696 | struct inode *dir, struct inode *inode) |
6b4ea016 JK |
697 | { |
698 | struct f2fs_dentry_block *dentry_blk; | |
699 | unsigned int bit_pos; | |
457d08ee | 700 | int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len)); |
0abd8e70 DJ |
701 | struct address_space *mapping = page_mapping(page); |
702 | unsigned long flags; | |
6b4ea016 JK |
703 | int i; |
704 | ||
d0239e1b JK |
705 | f2fs_update_time(F2FS_I_SB(dir), REQ_TIME); |
706 | ||
63189b78 | 707 | if (F2FS_OPTION(F2FS_I_SB(dir)).fsync_mode == FSYNC_MODE_STRICT) |
93cf93f1 | 708 | add_ino_entry(F2FS_I_SB(dir), dir->i_ino, TRANS_DIR_INO); |
0a007b97 | 709 | |
622f28ae CY |
710 | if (f2fs_has_inline_dentry(dir)) |
711 | return f2fs_delete_inline_entry(dentry, page, dir, inode); | |
712 | ||
6b4ea016 | 713 | lock_page(page); |
fec1d657 | 714 | f2fs_wait_on_page_writeback(page, DATA, true); |
6b4ea016 | 715 | |
1c3bb978 GZ |
716 | dentry_blk = page_address(page); |
717 | bit_pos = dentry - dentry_blk->dentry; | |
6b4ea016 | 718 | for (i = 0; i < slots; i++) |
23380b85 | 719 | __clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap); |
6b4ea016 JK |
720 | |
721 | /* Let's check and deallocate this dentry page */ | |
722 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
723 | NR_DENTRY_IN_BLOCK, | |
724 | 0); | |
6b4ea016 JK |
725 | set_page_dirty(page); |
726 | ||
078cd827 | 727 | dir->i_ctime = dir->i_mtime = current_time(dir); |
7c45729a | 728 | f2fs_mark_inode_dirty_sync(dir, false); |
6b4ea016 | 729 | |
dbeacf02 | 730 | if (inode) |
9f7c45cc | 731 | f2fs_drop_nlink(dir, inode); |
6b4ea016 | 732 | |
206e61be CY |
733 | if (bit_pos == NR_DENTRY_IN_BLOCK && |
734 | !truncate_hole(dir, page->index, page->index + 1)) { | |
b93b0163 MW |
735 | xa_lock_irqsave(&mapping->i_pages, flags); |
736 | radix_tree_tag_clear(&mapping->i_pages, page_index(page), | |
0abd8e70 | 737 | PAGECACHE_TAG_DIRTY); |
b93b0163 | 738 | xa_unlock_irqrestore(&mapping->i_pages, flags); |
0abd8e70 | 739 | |
6b4ea016 | 740 | clear_page_dirty_for_io(page); |
2bca1e23 | 741 | ClearPagePrivate(page); |
6b4ea016 | 742 | ClearPageUptodate(page); |
a7ffdbe2 | 743 | inode_dec_dirty_pages(dir); |
933439c8 | 744 | remove_dirty_inode(dir); |
6b4ea016 | 745 | } |
508198be | 746 | f2fs_put_page(page, 1); |
6b4ea016 JK |
747 | } |
748 | ||
749 | bool f2fs_empty_dir(struct inode *dir) | |
750 | { | |
751 | unsigned long bidx; | |
752 | struct page *dentry_page; | |
753 | unsigned int bit_pos; | |
dbeacf02 | 754 | struct f2fs_dentry_block *dentry_blk; |
6b4ea016 JK |
755 | unsigned long nblock = dir_blocks(dir); |
756 | ||
622f28ae CY |
757 | if (f2fs_has_inline_dentry(dir)) |
758 | return f2fs_empty_inline_dir(dir); | |
759 | ||
6b4ea016 | 760 | for (bidx = 0; bidx < nblock; bidx++) { |
a56c7c6f | 761 | dentry_page = get_lock_data_page(dir, bidx, false); |
6b4ea016 JK |
762 | if (IS_ERR(dentry_page)) { |
763 | if (PTR_ERR(dentry_page) == -ENOENT) | |
764 | continue; | |
765 | else | |
766 | return false; | |
767 | } | |
768 | ||
bdbc90fa | 769 | dentry_blk = page_address(dentry_page); |
6b4ea016 JK |
770 | if (bidx == 0) |
771 | bit_pos = 2; | |
772 | else | |
773 | bit_pos = 0; | |
774 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
775 | NR_DENTRY_IN_BLOCK, | |
776 | bit_pos); | |
6b4ea016 JK |
777 | |
778 | f2fs_put_page(dentry_page, 1); | |
779 | ||
780 | if (bit_pos < NR_DENTRY_IN_BLOCK) | |
781 | return false; | |
782 | } | |
783 | return true; | |
784 | } | |
785 | ||
ed6bd4b1 | 786 | int f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d, |
0b81d077 | 787 | unsigned int start_pos, struct fscrypt_str *fstr) |
38594de7 JK |
788 | { |
789 | unsigned char d_type = DT_UNKNOWN; | |
790 | unsigned int bit_pos; | |
791 | struct f2fs_dir_entry *de = NULL; | |
0b81d077 | 792 | struct fscrypt_str de_name = FSTR_INIT(NULL, 0); |
f6df8f23 | 793 | struct f2fs_sb_info *sbi = F2FS_I_SB(d->inode); |
38594de7 | 794 | |
7b3cd7d6 | 795 | bit_pos = ((unsigned long)ctx->pos % d->max); |
38594de7 | 796 | |
7b3cd7d6 JK |
797 | while (bit_pos < d->max) { |
798 | bit_pos = find_next_bit_le(d->bitmap, d->max, bit_pos); | |
799 | if (bit_pos >= d->max) | |
38594de7 JK |
800 | break; |
801 | ||
7b3cd7d6 | 802 | de = &d->dentry[bit_pos]; |
7d9dfa1d JK |
803 | if (de->name_len == 0) { |
804 | bit_pos++; | |
805 | ctx->pos = start_pos + bit_pos; | |
806 | continue; | |
807 | } | |
808 | ||
675f10bd | 809 | d_type = get_de_type(de); |
d8c6822a | 810 | |
d8c6822a JK |
811 | de_name.name = d->filename[bit_pos]; |
812 | de_name.len = le16_to_cpu(de->name_len); | |
813 | ||
814 | if (f2fs_encrypted_inode(d->inode)) { | |
815 | int save_len = fstr->len; | |
ef1eb3aa | 816 | int err; |
d8c6822a | 817 | |
ef1eb3aa | 818 | err = fscrypt_fname_disk_to_usr(d->inode, |
0b81d077 JK |
819 | (u32)de->hash_code, 0, |
820 | &de_name, fstr); | |
ef1eb3aa | 821 | if (err) |
ed6bd4b1 | 822 | return err; |
569cf187 JK |
823 | |
824 | de_name = *fstr; | |
825 | fstr->len = save_len; | |
d8c6822a JK |
826 | } |
827 | ||
828 | if (!dir_emit(ctx, de_name.name, de_name.len, | |
38594de7 | 829 | le32_to_cpu(de->ino), d_type)) |
ed6bd4b1 | 830 | return 1; |
38594de7 | 831 | |
f6df8f23 SY |
832 | if (sbi->readdir_ra == 1) |
833 | ra_node_page(sbi, le32_to_cpu(de->ino)); | |
834 | ||
38594de7 JK |
835 | bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len)); |
836 | ctx->pos = start_pos + bit_pos; | |
837 | } | |
ed6bd4b1 | 838 | return 0; |
38594de7 JK |
839 | } |
840 | ||
6f7f231e | 841 | static int f2fs_readdir(struct file *file, struct dir_context *ctx) |
6b4ea016 | 842 | { |
496ad9aa | 843 | struct inode *inode = file_inode(file); |
6b4ea016 | 844 | unsigned long npages = dir_blocks(inode); |
6b4ea016 | 845 | struct f2fs_dentry_block *dentry_blk = NULL; |
6b4ea016 | 846 | struct page *dentry_page = NULL; |
817202d9 | 847 | struct file_ra_state *ra = &file->f_ra; |
e97a3c4c | 848 | loff_t start_pos = ctx->pos; |
6f7f231e | 849 | unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK); |
7b3cd7d6 | 850 | struct f2fs_dentry_ptr d; |
0b81d077 | 851 | struct fscrypt_str fstr = FSTR_INIT(NULL, 0); |
d8c6822a | 852 | int err = 0; |
6b4ea016 | 853 | |
d8c6822a | 854 | if (f2fs_encrypted_inode(inode)) { |
0b81d077 | 855 | err = fscrypt_get_encryption_info(inode); |
8074bb51 | 856 | if (err && err != -ENOKEY) |
e97a3c4c | 857 | goto out; |
26bf3dc7 | 858 | |
0b81d077 | 859 | err = fscrypt_fname_alloc_buffer(inode, F2FS_NAME_LEN, &fstr); |
d8c6822a | 860 | if (err < 0) |
e97a3c4c | 861 | goto out; |
d8c6822a JK |
862 | } |
863 | ||
864 | if (f2fs_has_inline_dentry(inode)) { | |
865 | err = f2fs_read_inline_dir(file, ctx, &fstr); | |
e97a3c4c | 866 | goto out_free; |
d8c6822a | 867 | } |
622f28ae | 868 | |
ab383be5 | 869 | for (; n < npages; n++, ctx->pos = n * NR_DENTRY_IN_BLOCK) { |
4414dea8 CY |
870 | |
871 | /* allow readdir() to be interrupted */ | |
872 | if (fatal_signal_pending(current)) { | |
873 | err = -ERESTARTSYS; | |
874 | goto out_free; | |
875 | } | |
876 | cond_resched(); | |
877 | ||
cb7a8448 CY |
878 | /* readahead for multi pages of dir */ |
879 | if (npages - n > 1 && !ra_has_index(ra, n)) | |
880 | page_cache_sync_readahead(inode->i_mapping, ra, file, n, | |
881 | min(npages - n, (pgoff_t)MAX_DIR_RA_PAGES)); | |
882 | ||
a56c7c6f | 883 | dentry_page = get_lock_data_page(inode, n, false); |
57b62d29 CY |
884 | if (IS_ERR(dentry_page)) { |
885 | err = PTR_ERR(dentry_page); | |
ed6bd4b1 CY |
886 | if (err == -ENOENT) { |
887 | err = 0; | |
57b62d29 | 888 | continue; |
ed6bd4b1 | 889 | } else { |
e97a3c4c | 890 | goto out_free; |
ed6bd4b1 | 891 | } |
57b62d29 | 892 | } |
6b4ea016 | 893 | |
bdbc90fa | 894 | dentry_blk = page_address(dentry_page); |
99b072bb | 895 | |
64c24ecb | 896 | make_dentry_ptr_block(inode, &d, dentry_blk); |
7b3cd7d6 | 897 | |
ed6bd4b1 CY |
898 | err = f2fs_fill_dentries(ctx, &d, |
899 | n * NR_DENTRY_IN_BLOCK, &fstr); | |
900 | if (err) { | |
e9837bc2 CY |
901 | f2fs_put_page(dentry_page, 1); |
902 | break; | |
903 | } | |
38594de7 | 904 | |
6b4ea016 | 905 | f2fs_put_page(dentry_page, 1); |
6b4ea016 | 906 | } |
e97a3c4c | 907 | out_free: |
0b81d077 | 908 | fscrypt_fname_free_buffer(&fstr); |
e97a3c4c CY |
909 | out: |
910 | trace_f2fs_readdir(inode, start_pos, ctx->pos, err); | |
ed6bd4b1 | 911 | return err < 0 ? err : 0; |
6b4ea016 JK |
912 | } |
913 | ||
ed3360ab CY |
914 | static int f2fs_dir_open(struct inode *inode, struct file *filp) |
915 | { | |
916 | if (f2fs_encrypted_inode(inode)) | |
0b81d077 | 917 | return fscrypt_get_encryption_info(inode) ? -EACCES : 0; |
ed3360ab CY |
918 | return 0; |
919 | } | |
920 | ||
6b4ea016 JK |
921 | const struct file_operations f2fs_dir_operations = { |
922 | .llseek = generic_file_llseek, | |
923 | .read = generic_read_dir, | |
e77d0c63 | 924 | .iterate_shared = f2fs_readdir, |
6b4ea016 | 925 | .fsync = f2fs_sync_file, |
ed3360ab | 926 | .open = f2fs_dir_open, |
6b4ea016 | 927 | .unlocked_ioctl = f2fs_ioctl, |
08b95126 | 928 | #ifdef CONFIG_COMPAT |
929 | .compat_ioctl = f2fs_compat_ioctl, | |
930 | #endif | |
6b4ea016 | 931 | }; |