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Commit | Line | Data |
---|---|---|
0a8165d7 | 1 | /* |
6b4ea016 JK |
2 | * fs/f2fs/dir.c |
3 | * | |
4 | * Copyright (c) 2012 Samsung Electronics Co., Ltd. | |
5 | * http://www.samsung.com/ | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | #include <linux/fs.h> | |
12 | #include <linux/f2fs_fs.h> | |
13 | #include "f2fs.h" | |
398b1ac5 | 14 | #include "node.h" |
6b4ea016 | 15 | #include "acl.h" |
8ae8f162 | 16 | #include "xattr.h" |
6b4ea016 JK |
17 | |
18 | static unsigned long dir_blocks(struct inode *inode) | |
19 | { | |
09cbfeaf KS |
20 | return ((unsigned long long) (i_size_read(inode) + PAGE_SIZE - 1)) |
21 | >> PAGE_SHIFT; | |
6b4ea016 JK |
22 | } |
23 | ||
38431545 | 24 | static unsigned int dir_buckets(unsigned int level, int dir_level) |
6b4ea016 | 25 | { |
bfec07d0 | 26 | if (level + dir_level < MAX_DIR_HASH_DEPTH / 2) |
38431545 | 27 | return 1 << (level + dir_level); |
6b4ea016 | 28 | else |
bfec07d0 | 29 | return MAX_DIR_BUCKETS; |
6b4ea016 JK |
30 | } |
31 | ||
32 | static unsigned int bucket_blocks(unsigned int level) | |
33 | { | |
34 | if (level < MAX_DIR_HASH_DEPTH / 2) | |
35 | return 2; | |
36 | else | |
37 | return 4; | |
38 | } | |
39 | ||
ebfa7322 | 40 | static unsigned char f2fs_filetype_table[F2FS_FT_MAX] = { |
6b4ea016 JK |
41 | [F2FS_FT_UNKNOWN] = DT_UNKNOWN, |
42 | [F2FS_FT_REG_FILE] = DT_REG, | |
43 | [F2FS_FT_DIR] = DT_DIR, | |
44 | [F2FS_FT_CHRDEV] = DT_CHR, | |
45 | [F2FS_FT_BLKDEV] = DT_BLK, | |
46 | [F2FS_FT_FIFO] = DT_FIFO, | |
47 | [F2FS_FT_SOCK] = DT_SOCK, | |
48 | [F2FS_FT_SYMLINK] = DT_LNK, | |
49 | }; | |
50 | ||
6b4ea016 JK |
51 | static unsigned char f2fs_type_by_mode[S_IFMT >> S_SHIFT] = { |
52 | [S_IFREG >> S_SHIFT] = F2FS_FT_REG_FILE, | |
53 | [S_IFDIR >> S_SHIFT] = F2FS_FT_DIR, | |
54 | [S_IFCHR >> S_SHIFT] = F2FS_FT_CHRDEV, | |
55 | [S_IFBLK >> S_SHIFT] = F2FS_FT_BLKDEV, | |
56 | [S_IFIFO >> S_SHIFT] = F2FS_FT_FIFO, | |
57 | [S_IFSOCK >> S_SHIFT] = F2FS_FT_SOCK, | |
58 | [S_IFLNK >> S_SHIFT] = F2FS_FT_SYMLINK, | |
59 | }; | |
60 | ||
510022a8 | 61 | void set_de_type(struct f2fs_dir_entry *de, umode_t mode) |
6b4ea016 | 62 | { |
6b4ea016 JK |
63 | de->file_type = f2fs_type_by_mode[(mode & S_IFMT) >> S_SHIFT]; |
64 | } | |
65 | ||
675f10bd CY |
66 | unsigned char get_de_type(struct f2fs_dir_entry *de) |
67 | { | |
68 | if (de->file_type < F2FS_FT_MAX) | |
69 | return f2fs_filetype_table[de->file_type]; | |
70 | return DT_UNKNOWN; | |
71 | } | |
72 | ||
38431545 JK |
73 | static unsigned long dir_block_index(unsigned int level, |
74 | int dir_level, unsigned int idx) | |
6b4ea016 JK |
75 | { |
76 | unsigned long i; | |
77 | unsigned long bidx = 0; | |
78 | ||
79 | for (i = 0; i < level; i++) | |
38431545 | 80 | bidx += dir_buckets(i, dir_level) * bucket_blocks(i); |
6b4ea016 JK |
81 | bidx += idx * bucket_blocks(level); |
82 | return bidx; | |
83 | } | |
84 | ||
6b4ea016 | 85 | static struct f2fs_dir_entry *find_in_block(struct page *dentry_page, |
0b81d077 | 86 | struct fscrypt_name *fname, |
6e22c691 JK |
87 | f2fs_hash_t namehash, |
88 | int *max_slots, | |
4e6ebf6d JK |
89 | struct page **res_page) |
90 | { | |
91 | struct f2fs_dentry_block *dentry_blk; | |
92 | struct f2fs_dir_entry *de; | |
7b3cd7d6 | 93 | struct f2fs_dentry_ptr d; |
4e6ebf6d JK |
94 | |
95 | dentry_blk = (struct f2fs_dentry_block *)kmap(dentry_page); | |
7b3cd7d6 | 96 | |
64c24ecb | 97 | make_dentry_ptr_block(NULL, &d, dentry_blk); |
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; |
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 CY |
288 | f2fs_dentry_kunmap(dir, *page); |
289 | f2fs_put_page(*page, 0); | |
6b4ea016 JK |
290 | } |
291 | ||
292 | return res; | |
293 | } | |
294 | ||
295 | void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de, | |
296 | struct page *page, struct inode *inode) | |
297 | { | |
59a06155 | 298 | enum page_type type = f2fs_has_inline_dentry(dir) ? NODE : DATA; |
6b4ea016 | 299 | lock_page(page); |
fec1d657 | 300 | f2fs_wait_on_page_writeback(page, type, true); |
6b4ea016 | 301 | de->ino = cpu_to_le32(inode->i_ino); |
510022a8 | 302 | set_de_type(de, inode->i_mode); |
5df1f1da | 303 | f2fs_dentry_kunmap(dir, page); |
6b4ea016 | 304 | set_page_dirty(page); |
6666e6aa | 305 | |
078cd827 | 306 | dir->i_mtime = dir->i_ctime = current_time(dir); |
7c45729a | 307 | f2fs_mark_inode_dirty_sync(dir, false); |
6b4ea016 | 308 | f2fs_put_page(page, 1); |
6b4ea016 JK |
309 | } |
310 | ||
44a83ff6 | 311 | static void init_dent_inode(const struct qstr *name, struct page *ipage) |
6b4ea016 | 312 | { |
58bfaf44 | 313 | struct f2fs_inode *ri; |
6b4ea016 | 314 | |
fec1d657 | 315 | f2fs_wait_on_page_writeback(ipage, NODE, true); |
54b591df | 316 | |
53dc9a67 | 317 | /* copy name info. to this inode page */ |
58bfaf44 JK |
318 | ri = F2FS_INODE(ipage); |
319 | ri->i_namelen = cpu_to_le32(name->len); | |
320 | memcpy(ri->i_name, name->name, name->len); | |
6b4ea016 JK |
321 | set_page_dirty(ipage); |
322 | } | |
323 | ||
062a3e7b JK |
324 | void do_make_empty_dir(struct inode *inode, struct inode *parent, |
325 | struct f2fs_dentry_ptr *d) | |
326 | { | |
291bf80b CY |
327 | struct qstr dot = QSTR_INIT(".", 1); |
328 | struct qstr dotdot = QSTR_INIT("..", 2); | |
062a3e7b | 329 | |
291bf80b CY |
330 | /* update dirent of "." */ |
331 | f2fs_update_dentry(inode->i_ino, inode->i_mode, d, &dot, 0, 0); | |
062a3e7b | 332 | |
291bf80b CY |
333 | /* update dirent of ".." */ |
334 | f2fs_update_dentry(parent->i_ino, parent->i_mode, d, &dotdot, 0, 1); | |
062a3e7b JK |
335 | } |
336 | ||
44a83ff6 JK |
337 | static int make_empty_dir(struct inode *inode, |
338 | struct inode *parent, struct page *page) | |
39936837 JK |
339 | { |
340 | struct page *dentry_page; | |
341 | struct f2fs_dentry_block *dentry_blk; | |
062a3e7b | 342 | struct f2fs_dentry_ptr d; |
39936837 | 343 | |
622f28ae CY |
344 | if (f2fs_has_inline_dentry(inode)) |
345 | return make_empty_inline_dir(inode, parent, page); | |
346 | ||
44a83ff6 | 347 | dentry_page = get_new_data_page(inode, page, 0, true); |
39936837 JK |
348 | if (IS_ERR(dentry_page)) |
349 | return PTR_ERR(dentry_page); | |
350 | ||
1c3bb978 | 351 | dentry_blk = kmap_atomic(dentry_page); |
39936837 | 352 | |
64c24ecb | 353 | make_dentry_ptr_block(NULL, &d, dentry_blk); |
062a3e7b | 354 | do_make_empty_dir(inode, parent, &d); |
39936837 | 355 | |
1c3bb978 | 356 | kunmap_atomic(dentry_blk); |
39936837 JK |
357 | |
358 | set_page_dirty(dentry_page); | |
359 | f2fs_put_page(dentry_page, 1); | |
360 | return 0; | |
361 | } | |
362 | ||
bce8d112 | 363 | struct page *init_inode_metadata(struct inode *inode, struct inode *dir, |
9421d570 CY |
364 | const struct qstr *new_name, const struct qstr *orig_name, |
365 | struct page *dpage) | |
6b4ea016 | 366 | { |
44a83ff6 JK |
367 | struct page *page; |
368 | int err; | |
369 | ||
91942321 | 370 | if (is_inode_flag_set(inode, FI_NEW_INODE)) { |
a014e037 | 371 | page = new_inode_page(inode); |
44a83ff6 JK |
372 | if (IS_ERR(page)) |
373 | return page; | |
6b4ea016 JK |
374 | |
375 | if (S_ISDIR(inode->i_mode)) { | |
221149c0 JK |
376 | /* in order to handle error case */ |
377 | get_page(page); | |
44a83ff6 | 378 | err = make_empty_dir(inode, dir, page); |
221149c0 JK |
379 | if (err) { |
380 | lock_page(page); | |
381 | goto put_error; | |
382 | } | |
383 | put_page(page); | |
6b4ea016 JK |
384 | } |
385 | ||
bce8d112 | 386 | err = f2fs_init_acl(inode, dir, page, dpage); |
44a83ff6 | 387 | if (err) |
a8865372 | 388 | goto put_error; |
44a83ff6 | 389 | |
9421d570 | 390 | err = f2fs_init_security(inode, dir, orig_name, page); |
8ae8f162 | 391 | if (err) |
a8865372 | 392 | goto put_error; |
fcc85a4d JK |
393 | |
394 | if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode)) { | |
0b81d077 | 395 | err = fscrypt_inherit_context(dir, inode, page, false); |
fcc85a4d JK |
396 | if (err) |
397 | goto put_error; | |
398 | } | |
6b4ea016 | 399 | } else { |
4081363f | 400 | page = get_node_page(F2FS_I_SB(dir), inode->i_ino); |
44a83ff6 JK |
401 | if (IS_ERR(page)) |
402 | return page; | |
403 | ||
44a83ff6 | 404 | set_cold_node(inode, page); |
6b4ea016 | 405 | } |
44a83ff6 | 406 | |
d03ba4cc | 407 | if (new_name) { |
9421d570 | 408 | init_dent_inode(new_name, page); |
d03ba4cc KM |
409 | if (f2fs_encrypted_inode(dir)) |
410 | file_set_enc_name(inode); | |
411 | } | |
44a83ff6 | 412 | |
83d5d6f6 JK |
413 | /* |
414 | * This file should be checkpointed during fsync. | |
415 | * We lost i_pino from now on. | |
416 | */ | |
91942321 | 417 | if (is_inode_flag_set(inode, FI_INC_LINK)) { |
d58dfb75 SY |
418 | if (!S_ISDIR(inode->i_mode)) |
419 | file_lost_pino(inode); | |
50732df0 CY |
420 | /* |
421 | * If link the tmpfile to alias through linkat path, | |
422 | * we should remove this inode from orphan list. | |
423 | */ | |
424 | if (inode->i_nlink == 0) | |
4081363f | 425 | remove_orphan_inode(F2FS_I_SB(dir), inode->i_ino); |
a1961246 | 426 | f2fs_i_links_write(inode, true); |
6b4ea016 | 427 | } |
44a83ff6 JK |
428 | return page; |
429 | ||
a8865372 | 430 | put_error: |
221149c0 JK |
431 | clear_nlink(inode); |
432 | update_inode(inode, page); | |
433 | f2fs_put_page(page, 1); | |
44a83ff6 | 434 | return ERR_PTR(err); |
6b4ea016 JK |
435 | } |
436 | ||
dbeacf02 | 437 | void update_parent_metadata(struct inode *dir, struct inode *inode, |
6b4ea016 JK |
438 | unsigned int current_depth) |
439 | { | |
91942321 | 440 | if (inode && is_inode_flag_set(inode, FI_NEW_INODE)) { |
ee6d182f | 441 | if (S_ISDIR(inode->i_mode)) |
a1961246 | 442 | f2fs_i_links_write(dir, true); |
91942321 | 443 | clear_inode_flag(inode, FI_NEW_INODE); |
6b4ea016 | 444 | } |
078cd827 | 445 | dir->i_mtime = dir->i_ctime = current_time(dir); |
7c45729a | 446 | f2fs_mark_inode_dirty_sync(dir, false); |
a18ff063 | 447 | |
ee6d182f | 448 | if (F2FS_I(dir)->i_current_depth != current_depth) |
205b9822 | 449 | f2fs_i_depth_write(dir, current_depth); |
6b4ea016 | 450 | |
91942321 JK |
451 | if (inode && is_inode_flag_set(inode, FI_INC_LINK)) |
452 | clear_inode_flag(inode, FI_INC_LINK); | |
6b4ea016 JK |
453 | } |
454 | ||
a82afa20 | 455 | int room_for_filename(const void *bitmap, int slots, int max_slots) |
6b4ea016 JK |
456 | { |
457 | int bit_start = 0; | |
458 | int zero_start, zero_end; | |
459 | next: | |
a82afa20 JK |
460 | zero_start = find_next_zero_bit_le(bitmap, max_slots, bit_start); |
461 | if (zero_start >= max_slots) | |
462 | return max_slots; | |
463 | ||
464 | zero_end = find_next_bit_le(bitmap, max_slots, zero_start); | |
6b4ea016 JK |
465 | if (zero_end - zero_start >= slots) |
466 | return zero_start; | |
467 | ||
468 | bit_start = zero_end + 1; | |
469 | ||
a82afa20 JK |
470 | if (zero_end + 1 >= max_slots) |
471 | return max_slots; | |
6b4ea016 JK |
472 | goto next; |
473 | } | |
474 | ||
510022a8 | 475 | void f2fs_update_dentry(nid_t ino, umode_t mode, struct f2fs_dentry_ptr *d, |
3b4d732a CY |
476 | const struct qstr *name, f2fs_hash_t name_hash, |
477 | unsigned int bit_pos) | |
478 | { | |
479 | struct f2fs_dir_entry *de; | |
480 | int slots = GET_DENTRY_SLOTS(name->len); | |
481 | int i; | |
482 | ||
483 | de = &d->dentry[bit_pos]; | |
484 | de->hash_code = name_hash; | |
485 | de->name_len = cpu_to_le16(name->len); | |
486 | memcpy(d->filename[bit_pos], name->name, name->len); | |
510022a8 JK |
487 | de->ino = cpu_to_le32(ino); |
488 | set_de_type(de, mode); | |
7d9dfa1d | 489 | for (i = 0; i < slots; i++) { |
6bf6b267 | 490 | __set_bit_le(bit_pos + i, (void *)d->bitmap); |
7d9dfa1d JK |
491 | /* avoid wrong garbage data for readdir */ |
492 | if (i) | |
493 | (de + i)->name_len = 0; | |
494 | } | |
3b4d732a CY |
495 | } |
496 | ||
675f10bd | 497 | int f2fs_add_regular_entry(struct inode *dir, const struct qstr *new_name, |
9421d570 | 498 | const struct qstr *orig_name, |
510022a8 | 499 | struct inode *inode, nid_t ino, umode_t mode) |
6b4ea016 JK |
500 | { |
501 | unsigned int bit_pos; | |
502 | unsigned int level; | |
503 | unsigned int current_depth; | |
504 | unsigned long bidx, block; | |
505 | f2fs_hash_t dentry_hash; | |
6b4ea016 | 506 | unsigned int nbucket, nblock; |
6b4ea016 JK |
507 | struct page *dentry_page = NULL; |
508 | struct f2fs_dentry_block *dentry_blk = NULL; | |
3b4d732a | 509 | struct f2fs_dentry_ptr d; |
510022a8 | 510 | struct page *page = NULL; |
675f10bd | 511 | int slots, err = 0; |
622f28ae | 512 | |
6b4ea016 | 513 | level = 0; |
675f10bd | 514 | slots = GET_DENTRY_SLOTS(new_name->len); |
6332cd32 | 515 | dentry_hash = f2fs_dentry_hash(new_name, NULL); |
9ea97163 | 516 | |
6b4ea016 JK |
517 | current_depth = F2FS_I(dir)->i_current_depth; |
518 | if (F2FS_I(dir)->chash == dentry_hash) { | |
519 | level = F2FS_I(dir)->clevel; | |
520 | F2FS_I(dir)->chash = 0; | |
521 | } | |
522 | ||
523 | start: | |
cb78942b | 524 | #ifdef CONFIG_F2FS_FAULT_INJECTION |
55523519 CY |
525 | if (time_to_inject(F2FS_I_SB(dir), FAULT_DIR_DEPTH)) { |
526 | f2fs_show_injection_info(FAULT_DIR_DEPTH); | |
cb78942b | 527 | return -ENOSPC; |
55523519 | 528 | } |
cb78942b | 529 | #endif |
675f10bd CY |
530 | if (unlikely(current_depth == MAX_DIR_HASH_DEPTH)) |
531 | return -ENOSPC; | |
6b4ea016 JK |
532 | |
533 | /* Increase the depth, if required */ | |
534 | if (level == current_depth) | |
535 | ++current_depth; | |
536 | ||
38431545 | 537 | nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level); |
6b4ea016 JK |
538 | nblock = bucket_blocks(level); |
539 | ||
38431545 JK |
540 | bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level, |
541 | (le32_to_cpu(dentry_hash) % nbucket)); | |
6b4ea016 JK |
542 | |
543 | for (block = bidx; block <= (bidx + nblock - 1); block++) { | |
64aa7ed9 | 544 | dentry_page = get_new_data_page(dir, NULL, block, true); |
675f10bd CY |
545 | if (IS_ERR(dentry_page)) |
546 | return PTR_ERR(dentry_page); | |
6b4ea016 JK |
547 | |
548 | dentry_blk = kmap(dentry_page); | |
a82afa20 JK |
549 | bit_pos = room_for_filename(&dentry_blk->dentry_bitmap, |
550 | slots, NR_DENTRY_IN_BLOCK); | |
6b4ea016 JK |
551 | if (bit_pos < NR_DENTRY_IN_BLOCK) |
552 | goto add_dentry; | |
553 | ||
554 | kunmap(dentry_page); | |
555 | f2fs_put_page(dentry_page, 1); | |
6b4ea016 JK |
556 | } |
557 | ||
558 | /* Move to next level to find the empty slot for new dentry */ | |
559 | ++level; | |
560 | goto start; | |
561 | add_dentry: | |
fec1d657 | 562 | f2fs_wait_on_page_writeback(dentry_page, DATA, true); |
6b4ea016 | 563 | |
510022a8 JK |
564 | if (inode) { |
565 | down_write(&F2FS_I(inode)->i_sem); | |
9421d570 CY |
566 | page = init_inode_metadata(inode, dir, new_name, |
567 | orig_name, NULL); | |
510022a8 JK |
568 | if (IS_ERR(page)) { |
569 | err = PTR_ERR(page); | |
570 | goto fail; | |
571 | } | |
44a83ff6 | 572 | } |
3b4d732a | 573 | |
64c24ecb | 574 | make_dentry_ptr_block(NULL, &d, dentry_blk); |
675f10bd | 575 | f2fs_update_dentry(ino, mode, &d, new_name, dentry_hash, bit_pos); |
3b4d732a | 576 | |
6b4ea016 | 577 | set_page_dirty(dentry_page); |
6666e6aa | 578 | |
510022a8 | 579 | if (inode) { |
205b9822 | 580 | f2fs_i_pino_write(inode, dir->i_ino); |
510022a8 JK |
581 | f2fs_put_page(page, 1); |
582 | } | |
44a83ff6 JK |
583 | |
584 | update_parent_metadata(dir, inode, current_depth); | |
6b4ea016 | 585 | fail: |
510022a8 JK |
586 | if (inode) |
587 | up_write(&F2FS_I(inode)->i_sem); | |
d928bfbf | 588 | |
6b4ea016 JK |
589 | kunmap(dentry_page); |
590 | f2fs_put_page(dentry_page, 1); | |
675f10bd CY |
591 | |
592 | return err; | |
593 | } | |
594 | ||
e7ba108a SL |
595 | int __f2fs_do_add_link(struct inode *dir, struct fscrypt_name *fname, |
596 | struct inode *inode, nid_t ino, umode_t mode) | |
597 | { | |
598 | struct qstr new_name; | |
599 | int err = -EAGAIN; | |
600 | ||
601 | new_name.name = fname_name(fname); | |
602 | new_name.len = fname_len(fname); | |
603 | ||
604 | if (f2fs_has_inline_dentry(dir)) | |
605 | err = f2fs_add_inline_entry(dir, &new_name, fname->usr_fname, | |
606 | inode, ino, mode); | |
607 | if (err == -EAGAIN) | |
608 | err = f2fs_add_regular_entry(dir, &new_name, fname->usr_fname, | |
609 | inode, ino, mode); | |
610 | ||
611 | f2fs_update_time(F2FS_I_SB(dir), REQ_TIME); | |
612 | return err; | |
613 | } | |
614 | ||
675f10bd CY |
615 | /* |
616 | * Caller should grab and release a rwsem by calling f2fs_lock_op() and | |
617 | * f2fs_unlock_op(). | |
618 | */ | |
619 | int __f2fs_add_link(struct inode *dir, const struct qstr *name, | |
620 | struct inode *inode, nid_t ino, umode_t mode) | |
621 | { | |
622 | struct fscrypt_name fname; | |
88c5c13a JK |
623 | struct page *page = NULL; |
624 | struct f2fs_dir_entry *de = NULL; | |
675f10bd CY |
625 | int err; |
626 | ||
627 | err = fscrypt_setup_filename(dir, name, 0, &fname); | |
628 | if (err) | |
629 | return err; | |
630 | ||
88c5c13a JK |
631 | /* |
632 | * An immature stakable filesystem shows a race condition between lookup | |
633 | * and create. If we have same task when doing lookup and create, it's | |
634 | * definitely fine as expected by VFS normally. Otherwise, let's just | |
635 | * verify on-disk dentry one more time, which guarantees filesystem | |
636 | * consistency more. | |
637 | */ | |
638 | if (current != F2FS_I(dir)->task) { | |
639 | de = __f2fs_find_entry(dir, &fname, &page); | |
640 | F2FS_I(dir)->task = NULL; | |
641 | } | |
642 | if (de) { | |
643 | f2fs_dentry_kunmap(dir, page); | |
644 | f2fs_put_page(page, 0); | |
645 | err = -EEXIST; | |
646 | } else if (IS_ERR(page)) { | |
647 | err = PTR_ERR(page); | |
648 | } else { | |
649 | err = __f2fs_do_add_link(dir, &fname, inode, ino, mode); | |
650 | } | |
0b81d077 | 651 | fscrypt_free_filename(&fname); |
6b4ea016 JK |
652 | return err; |
653 | } | |
654 | ||
b97a9b5d JK |
655 | int f2fs_do_tmpfile(struct inode *inode, struct inode *dir) |
656 | { | |
657 | struct page *page; | |
658 | int err = 0; | |
659 | ||
660 | down_write(&F2FS_I(inode)->i_sem); | |
9421d570 | 661 | page = init_inode_metadata(inode, dir, NULL, NULL, NULL); |
b97a9b5d JK |
662 | if (IS_ERR(page)) { |
663 | err = PTR_ERR(page); | |
664 | goto fail; | |
665 | } | |
b97a9b5d JK |
666 | f2fs_put_page(page, 1); |
667 | ||
91942321 | 668 | clear_inode_flag(inode, FI_NEW_INODE); |
b97a9b5d JK |
669 | fail: |
670 | up_write(&F2FS_I(inode)->i_sem); | |
d0239e1b | 671 | f2fs_update_time(F2FS_I_SB(inode), REQ_TIME); |
b97a9b5d JK |
672 | return err; |
673 | } | |
674 | ||
9f7c45cc | 675 | void f2fs_drop_nlink(struct inode *dir, struct inode *inode) |
dbeacf02 CY |
676 | { |
677 | struct f2fs_sb_info *sbi = F2FS_I_SB(dir); | |
678 | ||
679 | down_write(&F2FS_I(inode)->i_sem); | |
680 | ||
ee6d182f | 681 | if (S_ISDIR(inode->i_mode)) |
a1961246 | 682 | f2fs_i_links_write(dir, false); |
078cd827 | 683 | inode->i_ctime = current_time(inode); |
dbeacf02 | 684 | |
a1961246 | 685 | f2fs_i_links_write(inode, false); |
dbeacf02 | 686 | if (S_ISDIR(inode->i_mode)) { |
a1961246 | 687 | f2fs_i_links_write(inode, false); |
fc9581c8 | 688 | f2fs_i_size_write(inode, 0); |
dbeacf02 CY |
689 | } |
690 | up_write(&F2FS_I(inode)->i_sem); | |
dbeacf02 CY |
691 | |
692 | if (inode->i_nlink == 0) | |
67c3758d | 693 | add_orphan_inode(inode); |
dbeacf02 CY |
694 | else |
695 | release_orphan_inode(sbi); | |
696 | } | |
697 | ||
0a8165d7 | 698 | /* |
e1c42045 | 699 | * It only removes the dentry from the dentry page, corresponding name |
6b4ea016 JK |
700 | * entry in name page does not need to be touched during deletion. |
701 | */ | |
702 | void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page, | |
dbeacf02 | 703 | struct inode *dir, struct inode *inode) |
6b4ea016 JK |
704 | { |
705 | struct f2fs_dentry_block *dentry_blk; | |
706 | unsigned int bit_pos; | |
457d08ee | 707 | int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len)); |
0abd8e70 DJ |
708 | struct address_space *mapping = page_mapping(page); |
709 | unsigned long flags; | |
6b4ea016 JK |
710 | int i; |
711 | ||
d0239e1b JK |
712 | f2fs_update_time(F2FS_I_SB(dir), REQ_TIME); |
713 | ||
622f28ae CY |
714 | if (f2fs_has_inline_dentry(dir)) |
715 | return f2fs_delete_inline_entry(dentry, page, dir, inode); | |
716 | ||
6b4ea016 | 717 | lock_page(page); |
fec1d657 | 718 | f2fs_wait_on_page_writeback(page, DATA, true); |
6b4ea016 | 719 | |
1c3bb978 GZ |
720 | dentry_blk = page_address(page); |
721 | bit_pos = dentry - dentry_blk->dentry; | |
6b4ea016 | 722 | for (i = 0; i < slots; i++) |
23380b85 | 723 | __clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap); |
6b4ea016 JK |
724 | |
725 | /* Let's check and deallocate this dentry page */ | |
726 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
727 | NR_DENTRY_IN_BLOCK, | |
728 | 0); | |
729 | kunmap(page); /* kunmap - pair of f2fs_find_entry */ | |
730 | set_page_dirty(page); | |
731 | ||
078cd827 | 732 | dir->i_ctime = dir->i_mtime = current_time(dir); |
7c45729a | 733 | f2fs_mark_inode_dirty_sync(dir, false); |
6b4ea016 | 734 | |
dbeacf02 | 735 | if (inode) |
9f7c45cc | 736 | f2fs_drop_nlink(dir, inode); |
6b4ea016 | 737 | |
206e61be CY |
738 | if (bit_pos == NR_DENTRY_IN_BLOCK && |
739 | !truncate_hole(dir, page->index, page->index + 1)) { | |
0abd8e70 DJ |
740 | spin_lock_irqsave(&mapping->tree_lock, flags); |
741 | radix_tree_tag_clear(&mapping->page_tree, page_index(page), | |
742 | PAGECACHE_TAG_DIRTY); | |
743 | spin_unlock_irqrestore(&mapping->tree_lock, flags); | |
744 | ||
6b4ea016 | 745 | clear_page_dirty_for_io(page); |
2bca1e23 | 746 | ClearPagePrivate(page); |
6b4ea016 | 747 | ClearPageUptodate(page); |
a7ffdbe2 | 748 | inode_dec_dirty_pages(dir); |
933439c8 | 749 | remove_dirty_inode(dir); |
6b4ea016 | 750 | } |
508198be | 751 | f2fs_put_page(page, 1); |
6b4ea016 JK |
752 | } |
753 | ||
754 | bool f2fs_empty_dir(struct inode *dir) | |
755 | { | |
756 | unsigned long bidx; | |
757 | struct page *dentry_page; | |
758 | unsigned int bit_pos; | |
dbeacf02 | 759 | struct f2fs_dentry_block *dentry_blk; |
6b4ea016 JK |
760 | unsigned long nblock = dir_blocks(dir); |
761 | ||
622f28ae CY |
762 | if (f2fs_has_inline_dentry(dir)) |
763 | return f2fs_empty_inline_dir(dir); | |
764 | ||
6b4ea016 | 765 | for (bidx = 0; bidx < nblock; bidx++) { |
a56c7c6f | 766 | dentry_page = get_lock_data_page(dir, bidx, false); |
6b4ea016 JK |
767 | if (IS_ERR(dentry_page)) { |
768 | if (PTR_ERR(dentry_page) == -ENOENT) | |
769 | continue; | |
770 | else | |
771 | return false; | |
772 | } | |
773 | ||
1c3bb978 | 774 | dentry_blk = kmap_atomic(dentry_page); |
6b4ea016 JK |
775 | if (bidx == 0) |
776 | bit_pos = 2; | |
777 | else | |
778 | bit_pos = 0; | |
779 | bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap, | |
780 | NR_DENTRY_IN_BLOCK, | |
781 | bit_pos); | |
1c3bb978 | 782 | kunmap_atomic(dentry_blk); |
6b4ea016 JK |
783 | |
784 | f2fs_put_page(dentry_page, 1); | |
785 | ||
786 | if (bit_pos < NR_DENTRY_IN_BLOCK) | |
787 | return false; | |
788 | } | |
789 | return true; | |
790 | } | |
791 | ||
ed6bd4b1 | 792 | int f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d, |
0b81d077 | 793 | unsigned int start_pos, struct fscrypt_str *fstr) |
38594de7 JK |
794 | { |
795 | unsigned char d_type = DT_UNKNOWN; | |
796 | unsigned int bit_pos; | |
797 | struct f2fs_dir_entry *de = NULL; | |
0b81d077 | 798 | struct fscrypt_str de_name = FSTR_INIT(NULL, 0); |
38594de7 | 799 | |
7b3cd7d6 | 800 | bit_pos = ((unsigned long)ctx->pos % d->max); |
38594de7 | 801 | |
7b3cd7d6 JK |
802 | while (bit_pos < d->max) { |
803 | bit_pos = find_next_bit_le(d->bitmap, d->max, bit_pos); | |
804 | if (bit_pos >= d->max) | |
38594de7 JK |
805 | break; |
806 | ||
7b3cd7d6 | 807 | de = &d->dentry[bit_pos]; |
7d9dfa1d JK |
808 | if (de->name_len == 0) { |
809 | bit_pos++; | |
810 | ctx->pos = start_pos + bit_pos; | |
811 | continue; | |
812 | } | |
813 | ||
675f10bd | 814 | d_type = get_de_type(de); |
d8c6822a | 815 | |
d8c6822a JK |
816 | de_name.name = d->filename[bit_pos]; |
817 | de_name.len = le16_to_cpu(de->name_len); | |
818 | ||
819 | if (f2fs_encrypted_inode(d->inode)) { | |
820 | int save_len = fstr->len; | |
ef1eb3aa | 821 | int err; |
d8c6822a | 822 | |
ef1eb3aa | 823 | err = fscrypt_fname_disk_to_usr(d->inode, |
0b81d077 JK |
824 | (u32)de->hash_code, 0, |
825 | &de_name, fstr); | |
ef1eb3aa | 826 | if (err) |
ed6bd4b1 | 827 | return err; |
569cf187 JK |
828 | |
829 | de_name = *fstr; | |
830 | fstr->len = save_len; | |
d8c6822a JK |
831 | } |
832 | ||
833 | if (!dir_emit(ctx, de_name.name, de_name.len, | |
38594de7 | 834 | le32_to_cpu(de->ino), d_type)) |
ed6bd4b1 | 835 | return 1; |
38594de7 JK |
836 | |
837 | bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len)); | |
838 | ctx->pos = start_pos + bit_pos; | |
839 | } | |
ed6bd4b1 | 840 | return 0; |
38594de7 JK |
841 | } |
842 | ||
6f7f231e | 843 | static int f2fs_readdir(struct file *file, struct dir_context *ctx) |
6b4ea016 | 844 | { |
496ad9aa | 845 | struct inode *inode = file_inode(file); |
6b4ea016 | 846 | unsigned long npages = dir_blocks(inode); |
6b4ea016 | 847 | struct f2fs_dentry_block *dentry_blk = NULL; |
6b4ea016 | 848 | struct page *dentry_page = NULL; |
817202d9 | 849 | struct file_ra_state *ra = &file->f_ra; |
6f7f231e | 850 | unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK); |
7b3cd7d6 | 851 | struct f2fs_dentry_ptr d; |
0b81d077 | 852 | struct fscrypt_str fstr = FSTR_INIT(NULL, 0); |
d8c6822a | 853 | int err = 0; |
6b4ea016 | 854 | |
d8c6822a | 855 | if (f2fs_encrypted_inode(inode)) { |
0b81d077 | 856 | err = fscrypt_get_encryption_info(inode); |
8074bb51 | 857 | if (err && err != -ENOKEY) |
26bf3dc7 JK |
858 | return err; |
859 | ||
0b81d077 | 860 | err = fscrypt_fname_alloc_buffer(inode, F2FS_NAME_LEN, &fstr); |
d8c6822a JK |
861 | if (err < 0) |
862 | return err; | |
863 | } | |
864 | ||
865 | if (f2fs_has_inline_dentry(inode)) { | |
866 | err = f2fs_read_inline_dir(file, ctx, &fstr); | |
867 | goto out; | |
868 | } | |
622f28ae | 869 | |
817202d9 CY |
870 | /* readahead for multi pages of dir */ |
871 | if (npages - n > 1 && !ra_has_index(ra, n)) | |
872 | page_cache_sync_readahead(inode->i_mapping, ra, file, n, | |
873 | min(npages - n, (pgoff_t)MAX_DIR_RA_PAGES)); | |
874 | ||
6c311ec6 | 875 | for (; n < npages; n++) { |
a56c7c6f | 876 | dentry_page = get_lock_data_page(inode, n, false); |
57b62d29 CY |
877 | if (IS_ERR(dentry_page)) { |
878 | err = PTR_ERR(dentry_page); | |
ed6bd4b1 CY |
879 | if (err == -ENOENT) { |
880 | err = 0; | |
57b62d29 | 881 | continue; |
ed6bd4b1 | 882 | } else { |
57b62d29 | 883 | goto out; |
ed6bd4b1 | 884 | } |
57b62d29 | 885 | } |
6b4ea016 | 886 | |
6b4ea016 | 887 | dentry_blk = kmap(dentry_page); |
99b072bb | 888 | |
64c24ecb | 889 | make_dentry_ptr_block(inode, &d, dentry_blk); |
7b3cd7d6 | 890 | |
ed6bd4b1 CY |
891 | err = f2fs_fill_dentries(ctx, &d, |
892 | n * NR_DENTRY_IN_BLOCK, &fstr); | |
893 | if (err) { | |
e9837bc2 CY |
894 | kunmap(dentry_page); |
895 | f2fs_put_page(dentry_page, 1); | |
896 | break; | |
897 | } | |
38594de7 | 898 | |
6f7f231e | 899 | ctx->pos = (n + 1) * NR_DENTRY_IN_BLOCK; |
6b4ea016 JK |
900 | kunmap(dentry_page); |
901 | f2fs_put_page(dentry_page, 1); | |
6b4ea016 | 902 | } |
d8c6822a | 903 | out: |
0b81d077 | 904 | fscrypt_fname_free_buffer(&fstr); |
ed6bd4b1 | 905 | return err < 0 ? err : 0; |
6b4ea016 JK |
906 | } |
907 | ||
ed3360ab CY |
908 | static int f2fs_dir_open(struct inode *inode, struct file *filp) |
909 | { | |
910 | if (f2fs_encrypted_inode(inode)) | |
0b81d077 | 911 | return fscrypt_get_encryption_info(inode) ? -EACCES : 0; |
ed3360ab CY |
912 | return 0; |
913 | } | |
914 | ||
6b4ea016 JK |
915 | const struct file_operations f2fs_dir_operations = { |
916 | .llseek = generic_file_llseek, | |
917 | .read = generic_read_dir, | |
e77d0c63 | 918 | .iterate_shared = f2fs_readdir, |
6b4ea016 | 919 | .fsync = f2fs_sync_file, |
ed3360ab | 920 | .open = f2fs_dir_open, |
6b4ea016 | 921 | .unlocked_ioctl = f2fs_ioctl, |
08b95126 | 922 | #ifdef CONFIG_COMPAT |
923 | .compat_ioctl = f2fs_compat_ioctl, | |
924 | #endif | |
6b4ea016 | 925 | }; |