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f2fs: fix to write node pages with WRITE_SYNC
[deliverable/linux.git] / fs / f2fs / dir.c
1 /*
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"
14 #include "node.h"
15 #include "acl.h"
16 #include "xattr.h"
17
18 static unsigned long dir_blocks(struct inode *inode)
19 {
20 return ((unsigned long long) (i_size_read(inode) + PAGE_CACHE_SIZE - 1))
21 >> PAGE_CACHE_SHIFT;
22 }
23
24 static unsigned int dir_buckets(unsigned int level, int dir_level)
25 {
26 if (level < MAX_DIR_HASH_DEPTH / 2)
27 return 1 << (level + dir_level);
28 else
29 return 1 << ((MAX_DIR_HASH_DEPTH / 2 + dir_level) - 1);
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
40 static unsigned char f2fs_filetype_table[F2FS_FT_MAX] = {
41 [F2FS_FT_UNKNOWN] = DT_UNKNOWN,
42 [F2FS_FT_REG_FILE] = DT_REG,
43 [F2FS_FT_DIR] = DT_DIR,
44 [F2FS_FT_CHRDEV] = DT_CHR,
45 [F2FS_FT_BLKDEV] = DT_BLK,
46 [F2FS_FT_FIFO] = DT_FIFO,
47 [F2FS_FT_SOCK] = DT_SOCK,
48 [F2FS_FT_SYMLINK] = DT_LNK,
49 };
50
51 #define S_SHIFT 12
52 static unsigned char f2fs_type_by_mode[S_IFMT >> S_SHIFT] = {
53 [S_IFREG >> S_SHIFT] = F2FS_FT_REG_FILE,
54 [S_IFDIR >> S_SHIFT] = F2FS_FT_DIR,
55 [S_IFCHR >> S_SHIFT] = F2FS_FT_CHRDEV,
56 [S_IFBLK >> S_SHIFT] = F2FS_FT_BLKDEV,
57 [S_IFIFO >> S_SHIFT] = F2FS_FT_FIFO,
58 [S_IFSOCK >> S_SHIFT] = F2FS_FT_SOCK,
59 [S_IFLNK >> S_SHIFT] = F2FS_FT_SYMLINK,
60 };
61
62 static void set_de_type(struct f2fs_dir_entry *de, struct inode *inode)
63 {
64 umode_t mode = inode->i_mode;
65 de->file_type = f2fs_type_by_mode[(mode & S_IFMT) >> S_SHIFT];
66 }
67
68 static unsigned long dir_block_index(unsigned int level,
69 int dir_level, unsigned int idx)
70 {
71 unsigned long i;
72 unsigned long bidx = 0;
73
74 for (i = 0; i < level; i++)
75 bidx += dir_buckets(i, dir_level) * bucket_blocks(i);
76 bidx += idx * bucket_blocks(level);
77 return bidx;
78 }
79
80 static bool early_match_name(const char *name, size_t namelen,
81 f2fs_hash_t namehash, struct f2fs_dir_entry *de)
82 {
83 if (le16_to_cpu(de->name_len) != namelen)
84 return false;
85
86 if (de->hash_code != namehash)
87 return false;
88
89 return true;
90 }
91
92 static struct f2fs_dir_entry *find_in_block(struct page *dentry_page,
93 const char *name, size_t namelen, int *max_slots,
94 f2fs_hash_t namehash, struct page **res_page)
95 {
96 struct f2fs_dir_entry *de;
97 unsigned long bit_pos = 0;
98 struct f2fs_dentry_block *dentry_blk = kmap(dentry_page);
99 int max_len = 0;
100
101 while (bit_pos < NR_DENTRY_IN_BLOCK) {
102 de = &dentry_blk->dentry[bit_pos];
103 if (!test_bit_le(bit_pos, &dentry_blk->dentry_bitmap)) {
104 if (bit_pos == 0)
105 max_len = 1;
106 else if (!test_bit_le(bit_pos - 1, &dentry_blk->dentry_bitmap))
107 max_len++;
108 bit_pos++;
109 continue;
110 }
111 if (early_match_name(name, namelen, namehash, de)) {
112 if (!memcmp(dentry_blk->filename[bit_pos],
113 name, namelen)) {
114 *res_page = dentry_page;
115 goto found;
116 }
117 }
118 if (max_len > *max_slots) {
119 *max_slots = max_len;
120 max_len = 0;
121 }
122 bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
123 }
124
125 de = NULL;
126 kunmap(dentry_page);
127 found:
128 if (max_len > *max_slots)
129 *max_slots = max_len;
130 return de;
131 }
132
133 static struct f2fs_dir_entry *find_in_level(struct inode *dir,
134 unsigned int level, const char *name, size_t namelen,
135 f2fs_hash_t namehash, struct page **res_page)
136 {
137 int s = GET_DENTRY_SLOTS(namelen);
138 unsigned int nbucket, nblock;
139 unsigned int bidx, end_block;
140 struct page *dentry_page;
141 struct f2fs_dir_entry *de = NULL;
142 bool room = false;
143 int max_slots = 0;
144
145 f2fs_bug_on(level > MAX_DIR_HASH_DEPTH);
146
147 nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level);
148 nblock = bucket_blocks(level);
149
150 bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level,
151 le32_to_cpu(namehash) % nbucket);
152 end_block = bidx + nblock;
153
154 for (; bidx < end_block; bidx++) {
155 /* no need to allocate new dentry pages to all the indices */
156 dentry_page = find_data_page(dir, bidx, true);
157 if (IS_ERR(dentry_page)) {
158 room = true;
159 continue;
160 }
161
162 de = find_in_block(dentry_page, name, namelen,
163 &max_slots, namehash, res_page);
164 if (de)
165 break;
166
167 if (max_slots >= s)
168 room = true;
169 f2fs_put_page(dentry_page, 0);
170 }
171
172 if (!de && room && F2FS_I(dir)->chash != namehash) {
173 F2FS_I(dir)->chash = namehash;
174 F2FS_I(dir)->clevel = level;
175 }
176
177 return de;
178 }
179
180 /*
181 * Find an entry in the specified directory with the wanted name.
182 * It returns the page where the entry was found (as a parameter - res_page),
183 * and the entry itself. Page is returned mapped and unlocked.
184 * Entry is guaranteed to be valid.
185 */
186 struct f2fs_dir_entry *f2fs_find_entry(struct inode *dir,
187 struct qstr *child, struct page **res_page)
188 {
189 const char *name = child->name;
190 size_t namelen = child->len;
191 unsigned long npages = dir_blocks(dir);
192 struct f2fs_dir_entry *de = NULL;
193 f2fs_hash_t name_hash;
194 unsigned int max_depth;
195 unsigned int level;
196
197 if (npages == 0)
198 return NULL;
199
200 *res_page = NULL;
201
202 name_hash = f2fs_dentry_hash(name, namelen);
203 max_depth = F2FS_I(dir)->i_current_depth;
204
205 for (level = 0; level < max_depth; level++) {
206 de = find_in_level(dir, level, name,
207 namelen, name_hash, res_page);
208 if (de)
209 break;
210 }
211 if (!de && F2FS_I(dir)->chash != name_hash) {
212 F2FS_I(dir)->chash = name_hash;
213 F2FS_I(dir)->clevel = level - 1;
214 }
215 return de;
216 }
217
218 struct f2fs_dir_entry *f2fs_parent_dir(struct inode *dir, struct page **p)
219 {
220 struct page *page;
221 struct f2fs_dir_entry *de;
222 struct f2fs_dentry_block *dentry_blk;
223
224 page = get_lock_data_page(dir, 0);
225 if (IS_ERR(page))
226 return NULL;
227
228 dentry_blk = kmap(page);
229 de = &dentry_blk->dentry[1];
230 *p = page;
231 unlock_page(page);
232 return de;
233 }
234
235 ino_t f2fs_inode_by_name(struct inode *dir, struct qstr *qstr)
236 {
237 ino_t res = 0;
238 struct f2fs_dir_entry *de;
239 struct page *page;
240
241 de = f2fs_find_entry(dir, qstr, &page);
242 if (de) {
243 res = le32_to_cpu(de->ino);
244 kunmap(page);
245 f2fs_put_page(page, 0);
246 }
247
248 return res;
249 }
250
251 void f2fs_set_link(struct inode *dir, struct f2fs_dir_entry *de,
252 struct page *page, struct inode *inode)
253 {
254 lock_page(page);
255 wait_on_page_writeback(page);
256 de->ino = cpu_to_le32(inode->i_ino);
257 set_de_type(de, inode);
258 kunmap(page);
259 set_page_dirty(page);
260 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
261 mark_inode_dirty(dir);
262
263 f2fs_put_page(page, 1);
264 }
265
266 static void init_dent_inode(const struct qstr *name, struct page *ipage)
267 {
268 struct f2fs_inode *ri;
269
270 /* copy name info. to this inode page */
271 ri = F2FS_INODE(ipage);
272 ri->i_namelen = cpu_to_le32(name->len);
273 memcpy(ri->i_name, name->name, name->len);
274 set_page_dirty(ipage);
275 }
276
277 int update_dent_inode(struct inode *inode, const struct qstr *name)
278 {
279 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
280 struct page *page;
281
282 page = get_node_page(sbi, inode->i_ino);
283 if (IS_ERR(page))
284 return PTR_ERR(page);
285
286 init_dent_inode(name, page);
287 f2fs_put_page(page, 1);
288
289 return 0;
290 }
291
292 static int make_empty_dir(struct inode *inode,
293 struct inode *parent, struct page *page)
294 {
295 struct page *dentry_page;
296 struct f2fs_dentry_block *dentry_blk;
297 struct f2fs_dir_entry *de;
298 void *kaddr;
299
300 dentry_page = get_new_data_page(inode, page, 0, true);
301 if (IS_ERR(dentry_page))
302 return PTR_ERR(dentry_page);
303
304 kaddr = kmap_atomic(dentry_page);
305 dentry_blk = (struct f2fs_dentry_block *)kaddr;
306
307 de = &dentry_blk->dentry[0];
308 de->name_len = cpu_to_le16(1);
309 de->hash_code = 0;
310 de->ino = cpu_to_le32(inode->i_ino);
311 memcpy(dentry_blk->filename[0], ".", 1);
312 set_de_type(de, inode);
313
314 de = &dentry_blk->dentry[1];
315 de->hash_code = 0;
316 de->name_len = cpu_to_le16(2);
317 de->ino = cpu_to_le32(parent->i_ino);
318 memcpy(dentry_blk->filename[1], "..", 2);
319 set_de_type(de, inode);
320
321 test_and_set_bit_le(0, &dentry_blk->dentry_bitmap);
322 test_and_set_bit_le(1, &dentry_blk->dentry_bitmap);
323 kunmap_atomic(kaddr);
324
325 set_page_dirty(dentry_page);
326 f2fs_put_page(dentry_page, 1);
327 return 0;
328 }
329
330 static struct page *init_inode_metadata(struct inode *inode,
331 struct inode *dir, const struct qstr *name)
332 {
333 struct page *page;
334 int err;
335
336 if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) {
337 page = new_inode_page(inode, name);
338 if (IS_ERR(page))
339 return page;
340
341 if (S_ISDIR(inode->i_mode)) {
342 err = make_empty_dir(inode, dir, page);
343 if (err)
344 goto error;
345 }
346
347 err = f2fs_init_acl(inode, dir, page);
348 if (err)
349 goto put_error;
350
351 err = f2fs_init_security(inode, dir, name, page);
352 if (err)
353 goto put_error;
354
355 wait_on_page_writeback(page);
356 } else {
357 page = get_node_page(F2FS_SB(dir->i_sb), inode->i_ino);
358 if (IS_ERR(page))
359 return page;
360
361 wait_on_page_writeback(page);
362 set_cold_node(inode, page);
363 }
364
365 init_dent_inode(name, page);
366
367 /*
368 * This file should be checkpointed during fsync.
369 * We lost i_pino from now on.
370 */
371 if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) {
372 file_lost_pino(inode);
373 inc_nlink(inode);
374 }
375 return page;
376
377 put_error:
378 f2fs_put_page(page, 1);
379 /* once the failed inode becomes a bad inode, i_mode is S_IFREG */
380 truncate_inode_pages(&inode->i_data, 0);
381 truncate_blocks(inode, 0);
382 remove_dirty_dir_inode(inode);
383 error:
384 remove_inode_page(inode);
385 return ERR_PTR(err);
386 }
387
388 static void update_parent_metadata(struct inode *dir, struct inode *inode,
389 unsigned int current_depth)
390 {
391 if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) {
392 if (S_ISDIR(inode->i_mode)) {
393 inc_nlink(dir);
394 set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
395 }
396 clear_inode_flag(F2FS_I(inode), FI_NEW_INODE);
397 }
398 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
399 mark_inode_dirty(dir);
400
401 if (F2FS_I(dir)->i_current_depth != current_depth) {
402 F2FS_I(dir)->i_current_depth = current_depth;
403 set_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
404 }
405
406 if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK))
407 clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
408 }
409
410 static int room_for_filename(struct f2fs_dentry_block *dentry_blk, int slots)
411 {
412 int bit_start = 0;
413 int zero_start, zero_end;
414 next:
415 zero_start = find_next_zero_bit_le(&dentry_blk->dentry_bitmap,
416 NR_DENTRY_IN_BLOCK,
417 bit_start);
418 if (zero_start >= NR_DENTRY_IN_BLOCK)
419 return NR_DENTRY_IN_BLOCK;
420
421 zero_end = find_next_bit_le(&dentry_blk->dentry_bitmap,
422 NR_DENTRY_IN_BLOCK,
423 zero_start);
424 if (zero_end - zero_start >= slots)
425 return zero_start;
426
427 bit_start = zero_end + 1;
428
429 if (zero_end + 1 >= NR_DENTRY_IN_BLOCK)
430 return NR_DENTRY_IN_BLOCK;
431 goto next;
432 }
433
434 /*
435 * Caller should grab and release a rwsem by calling f2fs_lock_op() and
436 * f2fs_unlock_op().
437 */
438 int __f2fs_add_link(struct inode *dir, const struct qstr *name,
439 struct inode *inode)
440 {
441 unsigned int bit_pos;
442 unsigned int level;
443 unsigned int current_depth;
444 unsigned long bidx, block;
445 f2fs_hash_t dentry_hash;
446 struct f2fs_dir_entry *de;
447 unsigned int nbucket, nblock;
448 size_t namelen = name->len;
449 struct page *dentry_page = NULL;
450 struct f2fs_dentry_block *dentry_blk = NULL;
451 int slots = GET_DENTRY_SLOTS(namelen);
452 struct page *page;
453 int err = 0;
454 int i;
455
456 dentry_hash = f2fs_dentry_hash(name->name, name->len);
457 level = 0;
458 current_depth = F2FS_I(dir)->i_current_depth;
459 if (F2FS_I(dir)->chash == dentry_hash) {
460 level = F2FS_I(dir)->clevel;
461 F2FS_I(dir)->chash = 0;
462 }
463
464 start:
465 if (unlikely(current_depth == MAX_DIR_HASH_DEPTH))
466 return -ENOSPC;
467
468 /* Increase the depth, if required */
469 if (level == current_depth)
470 ++current_depth;
471
472 nbucket = dir_buckets(level, F2FS_I(dir)->i_dir_level);
473 nblock = bucket_blocks(level);
474
475 bidx = dir_block_index(level, F2FS_I(dir)->i_dir_level,
476 (le32_to_cpu(dentry_hash) % nbucket));
477
478 for (block = bidx; block <= (bidx + nblock - 1); block++) {
479 dentry_page = get_new_data_page(dir, NULL, block, true);
480 if (IS_ERR(dentry_page))
481 return PTR_ERR(dentry_page);
482
483 dentry_blk = kmap(dentry_page);
484 bit_pos = room_for_filename(dentry_blk, slots);
485 if (bit_pos < NR_DENTRY_IN_BLOCK)
486 goto add_dentry;
487
488 kunmap(dentry_page);
489 f2fs_put_page(dentry_page, 1);
490 }
491
492 /* Move to next level to find the empty slot for new dentry */
493 ++level;
494 goto start;
495 add_dentry:
496 wait_on_page_writeback(dentry_page);
497
498 page = init_inode_metadata(inode, dir, name);
499 if (IS_ERR(page)) {
500 err = PTR_ERR(page);
501 goto fail;
502 }
503 de = &dentry_blk->dentry[bit_pos];
504 de->hash_code = dentry_hash;
505 de->name_len = cpu_to_le16(namelen);
506 memcpy(dentry_blk->filename[bit_pos], name->name, name->len);
507 de->ino = cpu_to_le32(inode->i_ino);
508 set_de_type(de, inode);
509 for (i = 0; i < slots; i++)
510 test_and_set_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
511 set_page_dirty(dentry_page);
512
513 /* we don't need to mark_inode_dirty now */
514 F2FS_I(inode)->i_pino = dir->i_ino;
515 update_inode(inode, page);
516 f2fs_put_page(page, 1);
517
518 update_parent_metadata(dir, inode, current_depth);
519 fail:
520 if (is_inode_flag_set(F2FS_I(dir), FI_UPDATE_DIR)) {
521 update_inode_page(dir);
522 clear_inode_flag(F2FS_I(dir), FI_UPDATE_DIR);
523 }
524 kunmap(dentry_page);
525 f2fs_put_page(dentry_page, 1);
526 return err;
527 }
528
529 /*
530 * It only removes the dentry from the dentry page,corresponding name
531 * entry in name page does not need to be touched during deletion.
532 */
533 void f2fs_delete_entry(struct f2fs_dir_entry *dentry, struct page *page,
534 struct inode *inode)
535 {
536 struct f2fs_dentry_block *dentry_blk;
537 unsigned int bit_pos;
538 struct address_space *mapping = page->mapping;
539 struct inode *dir = mapping->host;
540 int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
541 void *kaddr = page_address(page);
542 int i;
543
544 lock_page(page);
545 wait_on_page_writeback(page);
546
547 dentry_blk = (struct f2fs_dentry_block *)kaddr;
548 bit_pos = dentry - (struct f2fs_dir_entry *)dentry_blk->dentry;
549 for (i = 0; i < slots; i++)
550 test_and_clear_bit_le(bit_pos + i, &dentry_blk->dentry_bitmap);
551
552 /* Let's check and deallocate this dentry page */
553 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
554 NR_DENTRY_IN_BLOCK,
555 0);
556 kunmap(page); /* kunmap - pair of f2fs_find_entry */
557 set_page_dirty(page);
558
559 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
560
561 if (inode) {
562 struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
563
564 if (S_ISDIR(inode->i_mode)) {
565 drop_nlink(dir);
566 update_inode_page(dir);
567 }
568 inode->i_ctime = CURRENT_TIME;
569 drop_nlink(inode);
570 if (S_ISDIR(inode->i_mode)) {
571 drop_nlink(inode);
572 i_size_write(inode, 0);
573 }
574 update_inode_page(inode);
575
576 if (inode->i_nlink == 0)
577 add_orphan_inode(sbi, inode->i_ino);
578 else
579 release_orphan_inode(sbi);
580 }
581
582 if (bit_pos == NR_DENTRY_IN_BLOCK) {
583 truncate_hole(dir, page->index, page->index + 1);
584 clear_page_dirty_for_io(page);
585 ClearPageUptodate(page);
586 inode_dec_dirty_dents(dir);
587 }
588 f2fs_put_page(page, 1);
589 }
590
591 bool f2fs_empty_dir(struct inode *dir)
592 {
593 unsigned long bidx;
594 struct page *dentry_page;
595 unsigned int bit_pos;
596 struct f2fs_dentry_block *dentry_blk;
597 unsigned long nblock = dir_blocks(dir);
598
599 for (bidx = 0; bidx < nblock; bidx++) {
600 void *kaddr;
601 dentry_page = get_lock_data_page(dir, bidx);
602 if (IS_ERR(dentry_page)) {
603 if (PTR_ERR(dentry_page) == -ENOENT)
604 continue;
605 else
606 return false;
607 }
608
609 kaddr = kmap_atomic(dentry_page);
610 dentry_blk = (struct f2fs_dentry_block *)kaddr;
611 if (bidx == 0)
612 bit_pos = 2;
613 else
614 bit_pos = 0;
615 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
616 NR_DENTRY_IN_BLOCK,
617 bit_pos);
618 kunmap_atomic(kaddr);
619
620 f2fs_put_page(dentry_page, 1);
621
622 if (bit_pos < NR_DENTRY_IN_BLOCK)
623 return false;
624 }
625 return true;
626 }
627
628 static int f2fs_readdir(struct file *file, struct dir_context *ctx)
629 {
630 struct inode *inode = file_inode(file);
631 unsigned long npages = dir_blocks(inode);
632 unsigned int bit_pos = 0;
633 struct f2fs_dentry_block *dentry_blk = NULL;
634 struct f2fs_dir_entry *de = NULL;
635 struct page *dentry_page = NULL;
636 unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK);
637 unsigned char d_type = DT_UNKNOWN;
638
639 bit_pos = ((unsigned long)ctx->pos % NR_DENTRY_IN_BLOCK);
640
641 for (; n < npages; n++) {
642 dentry_page = get_lock_data_page(inode, n);
643 if (IS_ERR(dentry_page))
644 continue;
645
646 dentry_blk = kmap(dentry_page);
647 while (bit_pos < NR_DENTRY_IN_BLOCK) {
648 bit_pos = find_next_bit_le(&dentry_blk->dentry_bitmap,
649 NR_DENTRY_IN_BLOCK,
650 bit_pos);
651 if (bit_pos >= NR_DENTRY_IN_BLOCK)
652 break;
653
654 de = &dentry_blk->dentry[bit_pos];
655 if (de->file_type < F2FS_FT_MAX)
656 d_type = f2fs_filetype_table[de->file_type];
657 else
658 d_type = DT_UNKNOWN;
659 if (!dir_emit(ctx,
660 dentry_blk->filename[bit_pos],
661 le16_to_cpu(de->name_len),
662 le32_to_cpu(de->ino), d_type))
663 goto stop;
664
665 bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
666 ctx->pos = n * NR_DENTRY_IN_BLOCK + bit_pos;
667 }
668 bit_pos = 0;
669 ctx->pos = (n + 1) * NR_DENTRY_IN_BLOCK;
670 kunmap(dentry_page);
671 f2fs_put_page(dentry_page, 1);
672 dentry_page = NULL;
673 }
674 stop:
675 if (dentry_page && !IS_ERR(dentry_page)) {
676 kunmap(dentry_page);
677 f2fs_put_page(dentry_page, 1);
678 }
679
680 return 0;
681 }
682
683 const struct file_operations f2fs_dir_operations = {
684 .llseek = generic_file_llseek,
685 .read = generic_read_dir,
686 .iterate = f2fs_readdir,
687 .fsync = f2fs_sync_file,
688 .unlocked_ioctl = f2fs_ioctl,
689 };
Linux kernel - Deliverables
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