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Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
[linux-2.6.git] / fs / f2fs / file.c
blob7d714f4972d59505e04576306dfd99a363f3b7d4
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;
39
40 f2fs_balance_fs(sbi);
41
42 sb_start_pagefault(inode->i_sb);
43
44 /* block allocation */
45 f2fs_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 f2fs_unlock_op(sbi);
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 f2fs_unlock_op(sbi);
60 goto out;
61 }
62 }
63 f2fs_put_dnode(&dn);
64 f2fs_unlock_op(sbi);
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 trace_f2fs_vm_page_mkwrite(page, DATA);
92 mapped:
93 /* fill the page */
94 wait_on_page_writeback(page);
95 out:
96 sb_end_pagefault(inode->i_sb);
97 return block_page_mkwrite_return(err);
98 }
99
100 static const struct vm_operations_struct f2fs_file_vm_ops = {
101 .fault = filemap_fault,
102 .page_mkwrite = f2fs_vm_page_mkwrite,
103 .remap_pages = generic_file_remap_pages,
104 };
105
106 static int get_parent_ino(struct inode *inode, nid_t *pino)
107 {
108 struct dentry *dentry;
109
110 inode = igrab(inode);
111 dentry = d_find_any_alias(inode);
112 iput(inode);
113 if (!dentry)
114 return 0;
115
116 if (update_dent_inode(inode, &dentry->d_name)) {
117 dput(dentry);
118 return 0;
119 }
120
121 *pino = parent_ino(dentry);
122 dput(dentry);
123 return 1;
124 }
125
126 int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
127 {
128 struct inode *inode = file->f_mapping->host;
129 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
130 int ret = 0;
131 bool need_cp = false;
132 struct writeback_control wbc = {
133 .sync_mode = WB_SYNC_ALL,
134 .nr_to_write = LONG_MAX,
135 .for_reclaim = 0,
136 };
137
138 if (f2fs_readonly(inode->i_sb))
139 return 0;
140
141 trace_f2fs_sync_file_enter(inode);
142 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
143 if (ret) {
144 trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
145 return ret;
146 }
147
148 /* guarantee free sections for fsync */
149 f2fs_balance_fs(sbi);
150
151 mutex_lock(&inode->i_mutex);
152
153 /*
154 * Both of fdatasync() and fsync() are able to be recovered from
155 * sudden-power-off.
156 */
157 if (!S_ISREG(inode->i_mode) || inode->i_nlink != 1)
158 need_cp = true;
159 else if (file_wrong_pino(inode))
160 need_cp = true;
161 else if (!space_for_roll_forward(sbi))
162 need_cp = true;
163 else if (!is_checkpointed_node(sbi, F2FS_I(inode)->i_pino))
164 need_cp = true;
165 else if (F2FS_I(inode)->xattr_ver == cur_cp_version(F2FS_CKPT(sbi)))
166 need_cp = true;
167
168 if (need_cp) {
169 nid_t pino;
170
171 F2FS_I(inode)->xattr_ver = 0;
172
173 /* all the dirty node pages should be flushed for POR */
174 ret = f2fs_sync_fs(inode->i_sb, 1);
175 if (file_wrong_pino(inode) && inode->i_nlink == 1 &&
176 get_parent_ino(inode, &pino)) {
177 F2FS_I(inode)->i_pino = pino;
178 file_got_pino(inode);
179 mark_inode_dirty_sync(inode);
180 ret = f2fs_write_inode(inode, NULL);
181 if (ret)
182 goto out;
183 }
184 } else {
185 /* if there is no written node page, write its inode page */
186 while (!sync_node_pages(sbi, inode->i_ino, &wbc)) {
187 mark_inode_dirty_sync(inode);
188 ret = f2fs_write_inode(inode, NULL);
189 if (ret)
190 goto out;
191 }
192 ret = wait_on_node_pages_writeback(sbi, inode->i_ino);
193 if (ret)
194 goto out;
195 ret = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
196 }
197 out:
198 mutex_unlock(&inode->i_mutex);
199 trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
200 return ret;
201 }
202
203 static int f2fs_file_mmap(struct file *file, struct vm_area_struct *vma)
204 {
205 file_accessed(file);
206 vma->vm_ops = &f2fs_file_vm_ops;
207 return 0;
208 }
209
210 int truncate_data_blocks_range(struct dnode_of_data *dn, int count)
211 {
212 int nr_free = 0, ofs = dn->ofs_in_node;
213 struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
214 struct f2fs_node *raw_node;
215 __le32 *addr;
216
217 raw_node = F2FS_NODE(dn->node_page);
218 addr = blkaddr_in_node(raw_node) + ofs;
219
220 for ( ; count > 0; count--, addr++, dn->ofs_in_node++) {
221 block_t blkaddr = le32_to_cpu(*addr);
222 if (blkaddr == NULL_ADDR)
223 continue;
224
225 update_extent_cache(NULL_ADDR, dn);
226 invalidate_blocks(sbi, blkaddr);
227 nr_free++;
228 }
229 if (nr_free) {
230 dec_valid_block_count(sbi, dn->inode, nr_free);
231 set_page_dirty(dn->node_page);
232 sync_inode_page(dn);
233 }
234 dn->ofs_in_node = ofs;
235
236 trace_f2fs_truncate_data_blocks_range(dn->inode, dn->nid,
237 dn->ofs_in_node, nr_free);
238 return nr_free;
239 }
240
241 void truncate_data_blocks(struct dnode_of_data *dn)
242 {
243 truncate_data_blocks_range(dn, ADDRS_PER_BLOCK);
244 }
245
246 static void truncate_partial_data_page(struct inode *inode, u64 from)
247 {
248 unsigned offset = from & (PAGE_CACHE_SIZE - 1);
249 struct page *page;
250
251 if (!offset)
252 return;
253
254 page = find_data_page(inode, from >> PAGE_CACHE_SHIFT, false);
255 if (IS_ERR(page))
256 return;
257
258 lock_page(page);
259 if (page->mapping != inode->i_mapping) {
260 f2fs_put_page(page, 1);
261 return;
262 }
263 wait_on_page_writeback(page);
264 zero_user(page, offset, PAGE_CACHE_SIZE - offset);
265 set_page_dirty(page);
266 f2fs_put_page(page, 1);
267 }
268
269 static int truncate_blocks(struct inode *inode, u64 from)
270 {
271 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
272 unsigned int blocksize = inode->i_sb->s_blocksize;
273 struct dnode_of_data dn;
274 pgoff_t free_from;
275 int count = 0;
276 int err;
277
278 trace_f2fs_truncate_blocks_enter(inode, from);
279
280 free_from = (pgoff_t)
281 ((from + blocksize - 1) >> (sbi->log_blocksize));
282
283 f2fs_lock_op(sbi);
284 set_new_dnode(&dn, inode, NULL, NULL, 0);
285 err = get_dnode_of_data(&dn, free_from, LOOKUP_NODE);
286 if (err) {
287 if (err == -ENOENT)
288 goto free_next;
289 f2fs_unlock_op(sbi);
290 trace_f2fs_truncate_blocks_exit(inode, err);
291 return err;
292 }
293
294 if (IS_INODE(dn.node_page))
295 count = ADDRS_PER_INODE(F2FS_I(inode));
296 else
297 count = ADDRS_PER_BLOCK;
298
299 count -= dn.ofs_in_node;
300 f2fs_bug_on(count < 0);
301
302 if (dn.ofs_in_node || IS_INODE(dn.node_page)) {
303 truncate_data_blocks_range(&dn, count);
304 free_from += count;
305 }
306
307 f2fs_put_dnode(&dn);
308 free_next:
309 err = truncate_inode_blocks(inode, free_from);
310 f2fs_unlock_op(sbi);
311
312 /* lastly zero out the first data page */
313 truncate_partial_data_page(inode, from);
314
315 trace_f2fs_truncate_blocks_exit(inode, err);
316 return err;
317 }
318
319 void f2fs_truncate(struct inode *inode)
320 {
321 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
322 S_ISLNK(inode->i_mode)))
323 return;
324
325 trace_f2fs_truncate(inode);
326
327 if (!truncate_blocks(inode, i_size_read(inode))) {
328 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
329 mark_inode_dirty(inode);
330 }
331 }
332
333 int f2fs_getattr(struct vfsmount *mnt,
334 struct dentry *dentry, struct kstat *stat)
335 {
336 struct inode *inode = dentry->d_inode;
337 generic_fillattr(inode, stat);
338 stat->blocks <<= 3;
339 return 0;
340 }
341
342 #ifdef CONFIG_F2FS_FS_POSIX_ACL
343 static void __setattr_copy(struct inode *inode, const struct iattr *attr)
344 {
345 struct f2fs_inode_info *fi = F2FS_I(inode);
346 unsigned int ia_valid = attr->ia_valid;
347
348 if (ia_valid & ATTR_UID)
349 inode->i_uid = attr->ia_uid;
350 if (ia_valid & ATTR_GID)
351 inode->i_gid = attr->ia_gid;
352 if (ia_valid & ATTR_ATIME)
353 inode->i_atime = timespec_trunc(attr->ia_atime,
354 inode->i_sb->s_time_gran);
355 if (ia_valid & ATTR_MTIME)
356 inode->i_mtime = timespec_trunc(attr->ia_mtime,
357 inode->i_sb->s_time_gran);
358 if (ia_valid & ATTR_CTIME)
359 inode->i_ctime = timespec_trunc(attr->ia_ctime,
360 inode->i_sb->s_time_gran);
361 if (ia_valid & ATTR_MODE) {
362 umode_t mode = attr->ia_mode;
363
364 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
365 mode &= ~S_ISGID;
366 set_acl_inode(fi, mode);
367 }
368 }
369 #else
370 #define __setattr_copy setattr_copy
371 #endif
372
373 int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
374 {
375 struct inode *inode = dentry->d_inode;
376 struct f2fs_inode_info *fi = F2FS_I(inode);
377 int err;
378
379 err = inode_change_ok(inode, attr);
380 if (err)
381 return err;
382
383 if ((attr->ia_valid & ATTR_SIZE) &&
384 attr->ia_size != i_size_read(inode)) {
385 truncate_setsize(inode, attr->ia_size);
386 f2fs_truncate(inode);
387 f2fs_balance_fs(F2FS_SB(inode->i_sb));
388 }
389
390 __setattr_copy(inode, attr);
391
392 if (attr->ia_valid & ATTR_MODE) {
393 err = f2fs_acl_chmod(inode);
394 if (err || is_inode_flag_set(fi, FI_ACL_MODE)) {
395 inode->i_mode = fi->i_acl_mode;
396 clear_inode_flag(fi, FI_ACL_MODE);
397 }
398 }
399
400 mark_inode_dirty(inode);
401 return err;
402 }
403
404 const struct inode_operations f2fs_file_inode_operations = {
405 .getattr = f2fs_getattr,
406 .setattr = f2fs_setattr,
407 .get_acl = f2fs_get_acl,
408 #ifdef CONFIG_F2FS_FS_XATTR
409 .setxattr = generic_setxattr,
410 .getxattr = generic_getxattr,
411 .listxattr = f2fs_listxattr,
412 .removexattr = generic_removexattr,
413 #endif
414 };
415
416 static void fill_zero(struct inode *inode, pgoff_t index,
417 loff_t start, loff_t len)
418 {
419 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
420 struct page *page;
421
422 if (!len)
423 return;
424
425 f2fs_balance_fs(sbi);
426
427 f2fs_lock_op(sbi);
428 page = get_new_data_page(inode, NULL, index, false);
429 f2fs_unlock_op(sbi);
430
431 if (!IS_ERR(page)) {
432 wait_on_page_writeback(page);
433 zero_user(page, start, len);
434 set_page_dirty(page);
435 f2fs_put_page(page, 1);
436 }
437 }
438
439 int truncate_hole(struct inode *inode, pgoff_t pg_start, pgoff_t pg_end)
440 {
441 pgoff_t index;
442 int err;
443
444 for (index = pg_start; index < pg_end; index++) {
445 struct dnode_of_data dn;
446
447 set_new_dnode(&dn, inode, NULL, NULL, 0);
448 err = get_dnode_of_data(&dn, index, LOOKUP_NODE);
449 if (err) {
450 if (err == -ENOENT)
451 continue;
452 return err;
453 }
454
455 if (dn.data_blkaddr != NULL_ADDR)
456 truncate_data_blocks_range(&dn, 1);
457 f2fs_put_dnode(&dn);
458 }
459 return 0;
460 }
461
462 static int punch_hole(struct inode *inode, loff_t offset, loff_t len, int mode)
463 {
464 pgoff_t pg_start, pg_end;
465 loff_t off_start, off_end;
466 int ret = 0;
467
468 pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
469 pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;
470
471 off_start = offset & (PAGE_CACHE_SIZE - 1);
472 off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);
473
474 if (pg_start == pg_end) {
475 fill_zero(inode, pg_start, off_start,
476 off_end - off_start);
477 } else {
478 if (off_start)
479 fill_zero(inode, pg_start++, off_start,
480 PAGE_CACHE_SIZE - off_start);
481 if (off_end)
482 fill_zero(inode, pg_end, 0, off_end);
483
484 if (pg_start < pg_end) {
485 struct address_space *mapping = inode->i_mapping;
486 loff_t blk_start, blk_end;
487 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
488
489 f2fs_balance_fs(sbi);
490
491 blk_start = pg_start << PAGE_CACHE_SHIFT;
492 blk_end = pg_end << PAGE_CACHE_SHIFT;
493 truncate_inode_pages_range(mapping, blk_start,
494 blk_end - 1);
495
496 f2fs_lock_op(sbi);
497 ret = truncate_hole(inode, pg_start, pg_end);
498 f2fs_unlock_op(sbi);
499 }
500 }
501
502 if (!(mode & FALLOC_FL_KEEP_SIZE) &&
503 i_size_read(inode) <= (offset + len)) {
504 i_size_write(inode, offset);
505 mark_inode_dirty(inode);
506 }
507
508 return ret;
509 }
510
511 static int expand_inode_data(struct inode *inode, loff_t offset,
512 loff_t len, int mode)
513 {
514 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
515 pgoff_t index, pg_start, pg_end;
516 loff_t new_size = i_size_read(inode);
517 loff_t off_start, off_end;
518 int ret = 0;
519
520 ret = inode_newsize_ok(inode, (len + offset));
521 if (ret)
522 return ret;
523
524 pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
525 pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;
526
527 off_start = offset & (PAGE_CACHE_SIZE - 1);
528 off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);
529
530 for (index = pg_start; index <= pg_end; index++) {
531 struct dnode_of_data dn;
532
533 f2fs_lock_op(sbi);
534 set_new_dnode(&dn, inode, NULL, NULL, 0);
535 ret = get_dnode_of_data(&dn, index, ALLOC_NODE);
536 if (ret) {
537 f2fs_unlock_op(sbi);
538 break;
539 }
540
541 if (dn.data_blkaddr == NULL_ADDR) {
542 ret = reserve_new_block(&dn);
543 if (ret) {
544 f2fs_put_dnode(&dn);
545 f2fs_unlock_op(sbi);
546 break;
547 }
548 }
549 f2fs_put_dnode(&dn);
550 f2fs_unlock_op(sbi);
551
552 if (pg_start == pg_end)
553 new_size = offset + len;
554 else if (index == pg_start && off_start)
555 new_size = (index + 1) << PAGE_CACHE_SHIFT;
556 else if (index == pg_end)
557 new_size = (index << PAGE_CACHE_SHIFT) + off_end;
558 else
559 new_size += PAGE_CACHE_SIZE;
560 }
561
562 if (!(mode & FALLOC_FL_KEEP_SIZE) &&
563 i_size_read(inode) < new_size) {
564 i_size_write(inode, new_size);
565 mark_inode_dirty(inode);
566 }
567
568 return ret;
569 }
570
571 static long f2fs_fallocate(struct file *file, int mode,
572 loff_t offset, loff_t len)
573 {
574 struct inode *inode = file_inode(file);
575 long ret;
576
577 if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
578 return -EOPNOTSUPP;
579
580 if (mode & FALLOC_FL_PUNCH_HOLE)
581 ret = punch_hole(inode, offset, len, mode);
582 else
583 ret = expand_inode_data(inode, offset, len, mode);
584
585 if (!ret) {
586 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
587 mark_inode_dirty(inode);
588 }
589 trace_f2fs_fallocate(inode, mode, offset, len, ret);
590 return ret;
591 }
592
593 #define F2FS_REG_FLMASK (~(FS_DIRSYNC_FL | FS_TOPDIR_FL))
594 #define F2FS_OTHER_FLMASK (FS_NODUMP_FL | FS_NOATIME_FL)
595
596 static inline __u32 f2fs_mask_flags(umode_t mode, __u32 flags)
597 {
598 if (S_ISDIR(mode))
599 return flags;
600 else if (S_ISREG(mode))
601 return flags & F2FS_REG_FLMASK;
602 else
603 return flags & F2FS_OTHER_FLMASK;
604 }
605
606 long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
607 {
608 struct inode *inode = file_inode(filp);
609 struct f2fs_inode_info *fi = F2FS_I(inode);
610 unsigned int flags;
611 int ret;
612
613 switch (cmd) {
614 case F2FS_IOC_GETFLAGS:
615 flags = fi->i_flags & FS_FL_USER_VISIBLE;
616 return put_user(flags, (int __user *) arg);
617 case F2FS_IOC_SETFLAGS:
618 {
619 unsigned int oldflags;
620
621 ret = mnt_want_write_file(filp);
622 if (ret)
623 return ret;
624
625 if (!inode_owner_or_capable(inode)) {
626 ret = -EACCES;
627 goto out;
628 }
629
630 if (get_user(flags, (int __user *) arg)) {
631 ret = -EFAULT;
632 goto out;
633 }
634
635 flags = f2fs_mask_flags(inode->i_mode, flags);
636
637 mutex_lock(&inode->i_mutex);
638
639 oldflags = fi->i_flags;
640
641 if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
642 if (!capable(CAP_LINUX_IMMUTABLE)) {
643 mutex_unlock(&inode->i_mutex);
644 ret = -EPERM;
645 goto out;
646 }
647 }
648
649 flags = flags & FS_FL_USER_MODIFIABLE;
650 flags |= oldflags & ~FS_FL_USER_MODIFIABLE;
651 fi->i_flags = flags;
652 mutex_unlock(&inode->i_mutex);
653
654 f2fs_set_inode_flags(inode);
655 inode->i_ctime = CURRENT_TIME;
656 mark_inode_dirty(inode);
657 out:
658 mnt_drop_write_file(filp);
659 return ret;
660 }
661 default:
662 return -ENOTTY;
663 }
664 }
665
666 #ifdef CONFIG_COMPAT
667 long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
668 {
669 switch (cmd) {
670 case F2FS_IOC32_GETFLAGS:
671 cmd = F2FS_IOC_GETFLAGS;
672 break;
673 case F2FS_IOC32_SETFLAGS:
674 cmd = F2FS_IOC_SETFLAGS;
675 break;
676 default:
677 return -ENOIOCTLCMD;
678 }
679 return f2fs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
680 }
681 #endif
682
683 const struct file_operations f2fs_file_operations = {
684 .llseek = generic_file_llseek,
685 .read = do_sync_read,
686 .write = do_sync_write,
687 .aio_read = generic_file_aio_read,
688 .aio_write = generic_file_aio_write,
689 .open = generic_file_open,
690 .mmap = f2fs_file_mmap,
691 .fsync = f2fs_sync_file,
692 .fallocate = f2fs_fallocate,
693 .unlocked_ioctl = f2fs_ioctl,
694 #ifdef CONFIG_COMPAT
695 .compat_ioctl = f2fs_compat_ioctl,
696 #endif
697 .splice_read = generic_file_splice_read,
698 .splice_write = generic_file_splice_write,
699 };
Linus' kernel tree