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f2fs: fix i_name during f2fs_sync_file
[deliverable/linux.git] / fs / f2fs / file.c
1 /*
2 * fs/f2fs/file.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 <linux/stat.h>
14 #include <linux/buffer_head.h>
15 #include <linux/writeback.h>
16 #include <linux/blkdev.h>
17 #include <linux/falloc.h>
18 #include <linux/types.h>
19 #include <linux/compat.h>
20 #include <linux/uaccess.h>
21 #include <linux/mount.h>
22
23 #include "f2fs.h"
24 #include "node.h"
25 #include "segment.h"
26 #include "xattr.h"
27 #include "acl.h"
28 #include <trace/events/f2fs.h>
29
30 static int f2fs_vm_page_mkwrite(struct vm_area_struct *vma,
31 struct vm_fault *vmf)
32 {
33 struct page *page = vmf->page;
34 struct inode *inode = file_inode(vma->vm_file);
35 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
36 block_t old_blk_addr;
37 struct dnode_of_data dn;
38 int err, ilock;
39
40 f2fs_balance_fs(sbi);
41
42 sb_start_pagefault(inode->i_sb);
43
44 /* block allocation */
45 ilock = mutex_lock_op(sbi);
46 set_new_dnode(&dn, inode, NULL, NULL, 0);
47 err = get_dnode_of_data(&dn, page->index, ALLOC_NODE);
48 if (err) {
49 mutex_unlock_op(sbi, ilock);
50 goto out;
51 }
52
53 old_blk_addr = dn.data_blkaddr;
54
55 if (old_blk_addr == NULL_ADDR) {
56 err = reserve_new_block(&dn);
57 if (err) {
58 f2fs_put_dnode(&dn);
59 mutex_unlock_op(sbi, ilock);
60 goto out;
61 }
62 }
63 f2fs_put_dnode(&dn);
64 mutex_unlock_op(sbi, ilock);
65
66 file_update_time(vma->vm_file);
67 lock_page(page);
68 if (page->mapping != inode->i_mapping ||
69 page_offset(page) > i_size_read(inode) ||
70 !PageUptodate(page)) {
71 unlock_page(page);
72 err = -EFAULT;
73 goto out;
74 }
75
76 /*
77 * check to see if the page is mapped already (no holes)
78 */
79 if (PageMappedToDisk(page))
80 goto mapped;
81
82 /* page is wholly or partially inside EOF */
83 if (((page->index + 1) << PAGE_CACHE_SHIFT) > i_size_read(inode)) {
84 unsigned offset;
85 offset = i_size_read(inode) & ~PAGE_CACHE_MASK;
86 zero_user_segment(page, offset, PAGE_CACHE_SIZE);
87 }
88 set_page_dirty(page);
89 SetPageUptodate(page);
90
91 mapped:
92 /* fill the page */
93 wait_on_page_writeback(page);
94 out:
95 sb_end_pagefault(inode->i_sb);
96 return block_page_mkwrite_return(err);
97 }
98
99 static const struct vm_operations_struct f2fs_file_vm_ops = {
100 .fault = filemap_fault,
101 .page_mkwrite = f2fs_vm_page_mkwrite,
102 .remap_pages = generic_file_remap_pages,
103 };
104
105 static int get_parent_ino(struct inode *inode, nid_t *pino)
106 {
107 struct dentry *dentry;
108
109 inode = igrab(inode);
110 dentry = d_find_any_alias(inode);
111 iput(inode);
112 if (!dentry)
113 return 0;
114
115 if (update_dent_inode(inode, &dentry->d_name)) {
116 dput(dentry);
117 return 0;
118 }
119
120 *pino = parent_ino(dentry);
121 dput(dentry);
122 return 1;
123 }
124
125 int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
126 {
127 struct inode *inode = file->f_mapping->host;
128 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
129 int ret = 0;
130 bool need_cp = false;
131 struct writeback_control wbc = {
132 .sync_mode = WB_SYNC_ALL,
133 .nr_to_write = LONG_MAX,
134 .for_reclaim = 0,
135 };
136
137 if (f2fs_readonly(inode->i_sb))
138 return 0;
139
140 trace_f2fs_sync_file_enter(inode);
141 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
142 if (ret) {
143 trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
144 return ret;
145 }
146
147 /* guarantee free sections for fsync */
148 f2fs_balance_fs(sbi);
149
150 mutex_lock(&inode->i_mutex);
151
152 /*
153 * Both of fdatasync() and fsync() are able to be recovered from
154 * sudden-power-off.
155 */
156 if (!S_ISREG(inode->i_mode) || inode->i_nlink != 1)
157 need_cp = true;
158 else if (file_wrong_pino(inode))
159 need_cp = true;
160 else if (!space_for_roll_forward(sbi))
161 need_cp = true;
162 else if (!is_checkpointed_node(sbi, F2FS_I(inode)->i_pino))
163 need_cp = true;
164
165 if (need_cp) {
166 nid_t pino;
167
168 /* all the dirty node pages should be flushed for POR */
169 ret = f2fs_sync_fs(inode->i_sb, 1);
170 if (file_wrong_pino(inode) && inode->i_nlink == 1 &&
171 get_parent_ino(inode, &pino)) {
172 F2FS_I(inode)->i_pino = pino;
173 file_got_pino(inode);
174 mark_inode_dirty_sync(inode);
175 ret = f2fs_write_inode(inode, NULL);
176 if (ret)
177 goto out;
178 }
179 } else {
180 /* if there is no written node page, write its inode page */
181 while (!sync_node_pages(sbi, inode->i_ino, &wbc)) {
182 mark_inode_dirty_sync(inode);
183 ret = f2fs_write_inode(inode, NULL);
184 if (ret)
185 goto out;
186 }
187 filemap_fdatawait_range(sbi->node_inode->i_mapping,
188 0, LONG_MAX);
189 ret = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
190 }
191 out:
192 mutex_unlock(&inode->i_mutex);
193 trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
194 return ret;
195 }
196
197 static int f2fs_file_mmap(struct file *file, struct vm_area_struct *vma)
198 {
199 file_accessed(file);
200 vma->vm_ops = &f2fs_file_vm_ops;
201 return 0;
202 }
203
204 int truncate_data_blocks_range(struct dnode_of_data *dn, int count)
205 {
206 int nr_free = 0, ofs = dn->ofs_in_node;
207 struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
208 struct f2fs_node *raw_node;
209 __le32 *addr;
210
211 raw_node = F2FS_NODE(dn->node_page);
212 addr = blkaddr_in_node(raw_node) + ofs;
213
214 for ( ; count > 0; count--, addr++, dn->ofs_in_node++) {
215 block_t blkaddr = le32_to_cpu(*addr);
216 if (blkaddr == NULL_ADDR)
217 continue;
218
219 update_extent_cache(NULL_ADDR, dn);
220 invalidate_blocks(sbi, blkaddr);
221 nr_free++;
222 }
223 if (nr_free) {
224 dec_valid_block_count(sbi, dn->inode, nr_free);
225 set_page_dirty(dn->node_page);
226 sync_inode_page(dn);
227 }
228 dn->ofs_in_node = ofs;
229
230 trace_f2fs_truncate_data_blocks_range(dn->inode, dn->nid,
231 dn->ofs_in_node, nr_free);
232 return nr_free;
233 }
234
235 void truncate_data_blocks(struct dnode_of_data *dn)
236 {
237 truncate_data_blocks_range(dn, ADDRS_PER_BLOCK);
238 }
239
240 static void truncate_partial_data_page(struct inode *inode, u64 from)
241 {
242 unsigned offset = from & (PAGE_CACHE_SIZE - 1);
243 struct page *page;
244
245 if (!offset)
246 return;
247
248 page = find_data_page(inode, from >> PAGE_CACHE_SHIFT, false);
249 if (IS_ERR(page))
250 return;
251
252 lock_page(page);
253 if (page->mapping != inode->i_mapping) {
254 f2fs_put_page(page, 1);
255 return;
256 }
257 wait_on_page_writeback(page);
258 zero_user(page, offset, PAGE_CACHE_SIZE - offset);
259 set_page_dirty(page);
260 f2fs_put_page(page, 1);
261 }
262
263 static int truncate_blocks(struct inode *inode, u64 from)
264 {
265 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
266 unsigned int blocksize = inode->i_sb->s_blocksize;
267 struct dnode_of_data dn;
268 pgoff_t free_from;
269 int count = 0, ilock = -1;
270 int err;
271
272 trace_f2fs_truncate_blocks_enter(inode, from);
273
274 free_from = (pgoff_t)
275 ((from + blocksize - 1) >> (sbi->log_blocksize));
276
277 ilock = mutex_lock_op(sbi);
278 set_new_dnode(&dn, inode, NULL, NULL, 0);
279 err = get_dnode_of_data(&dn, free_from, LOOKUP_NODE);
280 if (err) {
281 if (err == -ENOENT)
282 goto free_next;
283 mutex_unlock_op(sbi, ilock);
284 trace_f2fs_truncate_blocks_exit(inode, err);
285 return err;
286 }
287
288 if (IS_INODE(dn.node_page))
289 count = ADDRS_PER_INODE;
290 else
291 count = ADDRS_PER_BLOCK;
292
293 count -= dn.ofs_in_node;
294 BUG_ON(count < 0);
295
296 if (dn.ofs_in_node || IS_INODE(dn.node_page)) {
297 truncate_data_blocks_range(&dn, count);
298 free_from += count;
299 }
300
301 f2fs_put_dnode(&dn);
302 free_next:
303 err = truncate_inode_blocks(inode, free_from);
304 mutex_unlock_op(sbi, ilock);
305
306 /* lastly zero out the first data page */
307 truncate_partial_data_page(inode, from);
308
309 trace_f2fs_truncate_blocks_exit(inode, err);
310 return err;
311 }
312
313 void f2fs_truncate(struct inode *inode)
314 {
315 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
316 S_ISLNK(inode->i_mode)))
317 return;
318
319 trace_f2fs_truncate(inode);
320
321 if (!truncate_blocks(inode, i_size_read(inode))) {
322 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
323 mark_inode_dirty(inode);
324 }
325 }
326
327 int f2fs_getattr(struct vfsmount *mnt,
328 struct dentry *dentry, struct kstat *stat)
329 {
330 struct inode *inode = dentry->d_inode;
331 generic_fillattr(inode, stat);
332 stat->blocks <<= 3;
333 return 0;
334 }
335
336 #ifdef CONFIG_F2FS_FS_POSIX_ACL
337 static void __setattr_copy(struct inode *inode, const struct iattr *attr)
338 {
339 struct f2fs_inode_info *fi = F2FS_I(inode);
340 unsigned int ia_valid = attr->ia_valid;
341
342 if (ia_valid & ATTR_UID)
343 inode->i_uid = attr->ia_uid;
344 if (ia_valid & ATTR_GID)
345 inode->i_gid = attr->ia_gid;
346 if (ia_valid & ATTR_ATIME)
347 inode->i_atime = timespec_trunc(attr->ia_atime,
348 inode->i_sb->s_time_gran);
349 if (ia_valid & ATTR_MTIME)
350 inode->i_mtime = timespec_trunc(attr->ia_mtime,
351 inode->i_sb->s_time_gran);
352 if (ia_valid & ATTR_CTIME)
353 inode->i_ctime = timespec_trunc(attr->ia_ctime,
354 inode->i_sb->s_time_gran);
355 if (ia_valid & ATTR_MODE) {
356 umode_t mode = attr->ia_mode;
357
358 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
359 mode &= ~S_ISGID;
360 set_acl_inode(fi, mode);
361 }
362 }
363 #else
364 #define __setattr_copy setattr_copy
365 #endif
366
367 int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
368 {
369 struct inode *inode = dentry->d_inode;
370 struct f2fs_inode_info *fi = F2FS_I(inode);
371 int err;
372
373 err = inode_change_ok(inode, attr);
374 if (err)
375 return err;
376
377 if ((attr->ia_valid & ATTR_SIZE) &&
378 attr->ia_size != i_size_read(inode)) {
379 truncate_setsize(inode, attr->ia_size);
380 f2fs_truncate(inode);
381 f2fs_balance_fs(F2FS_SB(inode->i_sb));
382 }
383
384 __setattr_copy(inode, attr);
385
386 if (attr->ia_valid & ATTR_MODE) {
387 err = f2fs_acl_chmod(inode);
388 if (err || is_inode_flag_set(fi, FI_ACL_MODE)) {
389 inode->i_mode = fi->i_acl_mode;
390 clear_inode_flag(fi, FI_ACL_MODE);
391 }
392 }
393
394 mark_inode_dirty(inode);
395 return err;
396 }
397
398 const struct inode_operations f2fs_file_inode_operations = {
399 .getattr = f2fs_getattr,
400 .setattr = f2fs_setattr,
401 .get_acl = f2fs_get_acl,
402 #ifdef CONFIG_F2FS_FS_XATTR
403 .setxattr = generic_setxattr,
404 .getxattr = generic_getxattr,
405 .listxattr = f2fs_listxattr,
406 .removexattr = generic_removexattr,
407 #endif
408 };
409
410 static void fill_zero(struct inode *inode, pgoff_t index,
411 loff_t start, loff_t len)
412 {
413 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
414 struct page *page;
415 int ilock;
416
417 if (!len)
418 return;
419
420 f2fs_balance_fs(sbi);
421
422 ilock = mutex_lock_op(sbi);
423 page = get_new_data_page(inode, NULL, index, false);
424 mutex_unlock_op(sbi, ilock);
425
426 if (!IS_ERR(page)) {
427 wait_on_page_writeback(page);
428 zero_user(page, start, len);
429 set_page_dirty(page);
430 f2fs_put_page(page, 1);
431 }
432 }
433
434 int truncate_hole(struct inode *inode, pgoff_t pg_start, pgoff_t pg_end)
435 {
436 pgoff_t index;
437 int err;
438
439 for (index = pg_start; index < pg_end; index++) {
440 struct dnode_of_data dn;
441
442 set_new_dnode(&dn, inode, NULL, NULL, 0);
443 err = get_dnode_of_data(&dn, index, LOOKUP_NODE);
444 if (err) {
445 if (err == -ENOENT)
446 continue;
447 return err;
448 }
449
450 if (dn.data_blkaddr != NULL_ADDR)
451 truncate_data_blocks_range(&dn, 1);
452 f2fs_put_dnode(&dn);
453 }
454 return 0;
455 }
456
457 static int punch_hole(struct inode *inode, loff_t offset, loff_t len, int mode)
458 {
459 pgoff_t pg_start, pg_end;
460 loff_t off_start, off_end;
461 int ret = 0;
462
463 pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
464 pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;
465
466 off_start = offset & (PAGE_CACHE_SIZE - 1);
467 off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);
468
469 if (pg_start == pg_end) {
470 fill_zero(inode, pg_start, off_start,
471 off_end - off_start);
472 } else {
473 if (off_start)
474 fill_zero(inode, pg_start++, off_start,
475 PAGE_CACHE_SIZE - off_start);
476 if (off_end)
477 fill_zero(inode, pg_end, 0, off_end);
478
479 if (pg_start < pg_end) {
480 struct address_space *mapping = inode->i_mapping;
481 loff_t blk_start, blk_end;
482 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
483 int ilock;
484
485 f2fs_balance_fs(sbi);
486
487 blk_start = pg_start << PAGE_CACHE_SHIFT;
488 blk_end = pg_end << PAGE_CACHE_SHIFT;
489 truncate_inode_pages_range(mapping, blk_start,
490 blk_end - 1);
491
492 ilock = mutex_lock_op(sbi);
493 ret = truncate_hole(inode, pg_start, pg_end);
494 mutex_unlock_op(sbi, ilock);
495 }
496 }
497
498 if (!(mode & FALLOC_FL_KEEP_SIZE) &&
499 i_size_read(inode) <= (offset + len)) {
500 i_size_write(inode, offset);
501 mark_inode_dirty(inode);
502 }
503
504 return ret;
505 }
506
507 static int expand_inode_data(struct inode *inode, loff_t offset,
508 loff_t len, int mode)
509 {
510 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
511 pgoff_t index, pg_start, pg_end;
512 loff_t new_size = i_size_read(inode);
513 loff_t off_start, off_end;
514 int ret = 0;
515
516 ret = inode_newsize_ok(inode, (len + offset));
517 if (ret)
518 return ret;
519
520 pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
521 pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;
522
523 off_start = offset & (PAGE_CACHE_SIZE - 1);
524 off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);
525
526 for (index = pg_start; index <= pg_end; index++) {
527 struct dnode_of_data dn;
528 int ilock;
529
530 ilock = mutex_lock_op(sbi);
531 set_new_dnode(&dn, inode, NULL, NULL, 0);
532 ret = get_dnode_of_data(&dn, index, ALLOC_NODE);
533 if (ret) {
534 mutex_unlock_op(sbi, ilock);
535 break;
536 }
537
538 if (dn.data_blkaddr == NULL_ADDR) {
539 ret = reserve_new_block(&dn);
540 if (ret) {
541 f2fs_put_dnode(&dn);
542 mutex_unlock_op(sbi, ilock);
543 break;
544 }
545 }
546 f2fs_put_dnode(&dn);
547 mutex_unlock_op(sbi, ilock);
548
549 if (pg_start == pg_end)
550 new_size = offset + len;
551 else if (index == pg_start && off_start)
552 new_size = (index + 1) << PAGE_CACHE_SHIFT;
553 else if (index == pg_end)
554 new_size = (index << PAGE_CACHE_SHIFT) + off_end;
555 else
556 new_size += PAGE_CACHE_SIZE;
557 }
558
559 if (!(mode & FALLOC_FL_KEEP_SIZE) &&
560 i_size_read(inode) < new_size) {
561 i_size_write(inode, new_size);
562 mark_inode_dirty(inode);
563 }
564
565 return ret;
566 }
567
568 static long f2fs_fallocate(struct file *file, int mode,
569 loff_t offset, loff_t len)
570 {
571 struct inode *inode = file_inode(file);
572 long ret;
573
574 if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
575 return -EOPNOTSUPP;
576
577 if (mode & FALLOC_FL_PUNCH_HOLE)
578 ret = punch_hole(inode, offset, len, mode);
579 else
580 ret = expand_inode_data(inode, offset, len, mode);
581
582 if (!ret) {
583 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
584 mark_inode_dirty(inode);
585 }
586 trace_f2fs_fallocate(inode, mode, offset, len, ret);
587 return ret;
588 }
589
590 #define F2FS_REG_FLMASK (~(FS_DIRSYNC_FL | FS_TOPDIR_FL))
591 #define F2FS_OTHER_FLMASK (FS_NODUMP_FL | FS_NOATIME_FL)
592
593 static inline __u32 f2fs_mask_flags(umode_t mode, __u32 flags)
594 {
595 if (S_ISDIR(mode))
596 return flags;
597 else if (S_ISREG(mode))
598 return flags & F2FS_REG_FLMASK;
599 else
600 return flags & F2FS_OTHER_FLMASK;
601 }
602
603 long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
604 {
605 struct inode *inode = file_inode(filp);
606 struct f2fs_inode_info *fi = F2FS_I(inode);
607 unsigned int flags;
608 int ret;
609
610 switch (cmd) {
611 case F2FS_IOC_GETFLAGS:
612 flags = fi->i_flags & FS_FL_USER_VISIBLE;
613 return put_user(flags, (int __user *) arg);
614 case F2FS_IOC_SETFLAGS:
615 {
616 unsigned int oldflags;
617
618 ret = mnt_want_write_file(filp);
619 if (ret)
620 return ret;
621
622 if (!inode_owner_or_capable(inode)) {
623 ret = -EACCES;
624 goto out;
625 }
626
627 if (get_user(flags, (int __user *) arg)) {
628 ret = -EFAULT;
629 goto out;
630 }
631
632 flags = f2fs_mask_flags(inode->i_mode, flags);
633
634 mutex_lock(&inode->i_mutex);
635
636 oldflags = fi->i_flags;
637
638 if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
639 if (!capable(CAP_LINUX_IMMUTABLE)) {
640 mutex_unlock(&inode->i_mutex);
641 ret = -EPERM;
642 goto out;
643 }
644 }
645
646 flags = flags & FS_FL_USER_MODIFIABLE;
647 flags |= oldflags & ~FS_FL_USER_MODIFIABLE;
648 fi->i_flags = flags;
649 mutex_unlock(&inode->i_mutex);
650
651 f2fs_set_inode_flags(inode);
652 inode->i_ctime = CURRENT_TIME;
653 mark_inode_dirty(inode);
654 out:
655 mnt_drop_write_file(filp);
656 return ret;
657 }
658 default:
659 return -ENOTTY;
660 }
661 }
662
663 #ifdef CONFIG_COMPAT
664 long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
665 {
666 switch (cmd) {
667 case F2FS_IOC32_GETFLAGS:
668 cmd = F2FS_IOC_GETFLAGS;
669 break;
670 case F2FS_IOC32_SETFLAGS:
671 cmd = F2FS_IOC_SETFLAGS;
672 break;
673 default:
674 return -ENOIOCTLCMD;
675 }
676 return f2fs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
677 }
678 #endif
679
680 const struct file_operations f2fs_file_operations = {
681 .llseek = generic_file_llseek,
682 .read = do_sync_read,
683 .write = do_sync_write,
684 .aio_read = generic_file_aio_read,
685 .aio_write = generic_file_aio_write,
686 .open = generic_file_open,
687 .mmap = f2fs_file_mmap,
688 .fsync = f2fs_sync_file,
689 .fallocate = f2fs_fallocate,
690 .unlocked_ioctl = f2fs_ioctl,
691 #ifdef CONFIG_COMPAT
692 .compat_ioctl = f2fs_compat_ioctl,
693 #endif
694 .splice_read = generic_file_splice_read,
695 .splice_write = generic_file_splice_write,
696 };
Linux kernel - Deliverables
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