file.c 23.4 KB
Newer Older
Jaegeuk Kim's avatar
Jaegeuk Kim committed
1
/*
Jaegeuk Kim's avatar
Jaegeuk Kim committed
2
3
4
5
6
7
8
9
10
11
12
13
14
15
 * fs/f2fs/file.c
 *
 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
 *             http://www.samsung.com/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/fs.h>
#include <linux/f2fs_fs.h>
#include <linux/stat.h>
#include <linux/buffer_head.h>
#include <linux/writeback.h>
16
#include <linux/blkdev.h>
Jaegeuk Kim's avatar
Jaegeuk Kim committed
17
18
#include <linux/falloc.h>
#include <linux/types.h>
19
#include <linux/compat.h>
Jaegeuk Kim's avatar
Jaegeuk Kim committed
20
21
#include <linux/uaccess.h>
#include <linux/mount.h>
22
#include <linux/pagevec.h>
Jaegeuk Kim's avatar
Jaegeuk Kim committed
23
24
25
26
27
28

#include "f2fs.h"
#include "node.h"
#include "segment.h"
#include "xattr.h"
#include "acl.h"
29
#include <trace/events/f2fs.h>
Jaegeuk Kim's avatar
Jaegeuk Kim committed
30
31
32
33
34

static int f2fs_vm_page_mkwrite(struct vm_area_struct *vma,
						struct vm_fault *vmf)
{
	struct page *page = vmf->page;
35
	struct inode *inode = file_inode(vma->vm_file);
36
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
37
	struct dnode_of_data dn;
38
	struct page *ipage;
39
	int err;
Jaegeuk Kim's avatar
Jaegeuk Kim committed
40
41
42
43

	f2fs_balance_fs(sbi);

	sb_start_pagefault(inode->i_sb);
44
retry:
45
46
47
48
49
	/* force to convert with normal data indices */
	err = f2fs_convert_inline_data(inode, MAX_INLINE_DATA + 1, page);
	if (err)
		goto out;

Jaegeuk Kim's avatar
Jaegeuk Kim committed
50
	/* block allocation */
51
	f2fs_lock_op(sbi);
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66

	/* check inline_data */
	ipage = get_node_page(sbi, inode->i_ino);
	if (IS_ERR(ipage)) {
		f2fs_unlock_op(sbi);
		goto out;
	}

	if (f2fs_has_inline_data(inode)) {
		f2fs_put_page(ipage, 1);
		f2fs_unlock_op(sbi);
		goto retry;
	}

	set_new_dnode(&dn, inode, ipage, NULL, 0);
67
	err = f2fs_reserve_block(&dn, page->index);
68
69
	if (err) {
		f2fs_unlock_op(sbi);
70
		goto out;
71
72
73
	}
	f2fs_put_dnode(&dn);
	f2fs_unlock_op(sbi);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
74

75
	file_update_time(vma->vm_file);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
76
	lock_page(page);
77
	if (unlikely(page->mapping != inode->i_mapping ||
78
			page_offset(page) > i_size_read(inode) ||
79
			!PageUptodate(page))) {
Jaegeuk Kim's avatar
Jaegeuk Kim committed
80
81
82
83
84
85
86
87
88
		unlock_page(page);
		err = -EFAULT;
		goto out;
	}

	/*
	 * check to see if the page is mapped already (no holes)
	 */
	if (PageMappedToDisk(page))
89
		goto mapped;
Jaegeuk Kim's avatar
Jaegeuk Kim committed
90
91
92
93
94
95
96
97
98
99

	/* page is wholly or partially inside EOF */
	if (((page->index + 1) << PAGE_CACHE_SHIFT) > i_size_read(inode)) {
		unsigned offset;
		offset = i_size_read(inode) & ~PAGE_CACHE_MASK;
		zero_user_segment(page, offset, PAGE_CACHE_SIZE);
	}
	set_page_dirty(page);
	SetPageUptodate(page);

100
	trace_f2fs_vm_page_mkwrite(page, DATA);
101
102
mapped:
	/* fill the page */
103
	f2fs_wait_on_page_writeback(page, DATA);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
104
105
106
107
108
109
out:
	sb_end_pagefault(inode->i_sb);
	return block_page_mkwrite_return(err);
}

static const struct vm_operations_struct f2fs_file_vm_ops = {
110
	.fault		= filemap_fault,
111
	.map_pages	= filemap_map_pages,
112
113
	.page_mkwrite	= f2fs_vm_page_mkwrite,
	.remap_pages	= generic_file_remap_pages,
Jaegeuk Kim's avatar
Jaegeuk Kim committed
114
115
};

116
117
118
119
120
121
122
123
124
125
static int get_parent_ino(struct inode *inode, nid_t *pino)
{
	struct dentry *dentry;

	inode = igrab(inode);
	dentry = d_find_any_alias(inode);
	iput(inode);
	if (!dentry)
		return 0;

126
127
128
129
	if (update_dent_inode(inode, &dentry->d_name)) {
		dput(dentry);
		return 0;
	}
130

131
132
	*pino = parent_ino(dentry);
	dput(dentry);
133
134
135
	return 1;
}

136
137
static inline bool need_do_checkpoint(struct inode *inode)
{
138
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
	bool need_cp = false;

	if (!S_ISREG(inode->i_mode) || inode->i_nlink != 1)
		need_cp = true;
	else if (file_wrong_pino(inode))
		need_cp = true;
	else if (!space_for_roll_forward(sbi))
		need_cp = true;
	else if (!is_checkpointed_node(sbi, F2FS_I(inode)->i_pino))
		need_cp = true;
	else if (F2FS_I(inode)->xattr_ver == cur_cp_version(F2FS_CKPT(sbi)))
		need_cp = true;

	return need_cp;
}

Jaegeuk Kim's avatar
Jaegeuk Kim committed
155
156
157
int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
{
	struct inode *inode = file->f_mapping->host;
158
	struct f2fs_inode_info *fi = F2FS_I(inode);
159
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
160
	nid_t ino = inode->i_ino;
Jaegeuk Kim's avatar
Jaegeuk Kim committed
161
162
163
	int ret = 0;
	bool need_cp = false;
	struct writeback_control wbc = {
164
		.sync_mode = WB_SYNC_ALL,
Jaegeuk Kim's avatar
Jaegeuk Kim committed
165
166
167
168
		.nr_to_write = LONG_MAX,
		.for_reclaim = 0,
	};

169
	if (unlikely(f2fs_readonly(inode->i_sb)))
170
171
		return 0;

172
	trace_f2fs_sync_file_enter(inode);
173
174

	/* if fdatasync is triggered, let's do in-place-update */
175
	if (get_dirty_pages(inode) <= SM_I(sbi)->min_fsync_blocks)
176
		set_inode_flag(fi, FI_NEED_IPU);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
177
	ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
178
179
	clear_inode_flag(fi, FI_NEED_IPU);

180
181
	if (ret) {
		trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
182
		return ret;
183
	}
Jaegeuk Kim's avatar
Jaegeuk Kim committed
184

185
186
187
188
	/*
	 * if there is no written data, don't waste time to write recovery info.
	 */
	if (!is_inode_flag_set(fi, FI_APPEND_WRITE) &&
189
			!exist_written_data(sbi, ino, APPEND_INO)) {
190
191
192
193
194
195
196
197
198
		struct page *i = find_get_page(NODE_MAPPING(sbi), ino);

		/* But we need to avoid that there are some inode updates */
		if ((i && PageDirty(i)) || need_inode_block_update(sbi, ino)) {
			f2fs_put_page(i, 0);
			goto go_write;
		}
		f2fs_put_page(i, 0);

199
		if (is_inode_flag_set(fi, FI_UPDATE_WRITE) ||
200
				exist_written_data(sbi, ino, UPDATE_INO))
201
202
203
			goto flush_out;
		goto out;
	}
204
go_write:
205
206
207
	/* guarantee free sections for fsync */
	f2fs_balance_fs(sbi);

208
209
210
211
	/*
	 * Both of fdatasync() and fsync() are able to be recovered from
	 * sudden-power-off.
	 */
212
213
	down_read(&fi->i_sem);
	need_cp = need_do_checkpoint(inode);
214
215
	up_read(&fi->i_sem);

Jaegeuk Kim's avatar
Jaegeuk Kim committed
216
	if (need_cp) {
217
218
		nid_t pino;

Jaegeuk Kim's avatar
Jaegeuk Kim committed
219
220
		/* all the dirty node pages should be flushed for POR */
		ret = f2fs_sync_fs(inode->i_sb, 1);
221
222
223

		down_write(&fi->i_sem);
		F2FS_I(inode)->xattr_ver = 0;
224
225
226
227
		if (file_wrong_pino(inode) && inode->i_nlink == 1 &&
					get_parent_ino(inode, &pino)) {
			F2FS_I(inode)->i_pino = pino;
			file_got_pino(inode);
228
			up_write(&fi->i_sem);
229
230
231
232
			mark_inode_dirty_sync(inode);
			ret = f2fs_write_inode(inode, NULL);
			if (ret)
				goto out;
233
234
		} else {
			up_write(&fi->i_sem);
235
		}
Jaegeuk Kim's avatar
Jaegeuk Kim committed
236
	} else {
237
238
239
240
sync_nodes:
		sync_node_pages(sbi, ino, &wbc);

		if (need_inode_block_update(sbi, ino)) {
241
			mark_inode_dirty_sync(inode);
242
243
244
			ret = f2fs_write_inode(inode, NULL);
			if (ret)
				goto out;
245
			goto sync_nodes;
246
		}
247

248
		ret = wait_on_node_pages_writeback(sbi, ino);
249
250
		if (ret)
			goto out;
251
252

		/* once recovery info is written, don't need to tack this */
253
		remove_dirty_inode(sbi, ino, APPEND_INO);
254
255
		clear_inode_flag(fi, FI_APPEND_WRITE);
flush_out:
256
		remove_dirty_inode(sbi, ino, UPDATE_INO);
257
		clear_inode_flag(fi, FI_UPDATE_WRITE);
258
		ret = f2fs_issue_flush(F2FS_I_SB(inode));
Jaegeuk Kim's avatar
Jaegeuk Kim committed
259
260
	}
out:
261
	trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
262
263
264
	return ret;
}

265
266
267
268
269
270
271
272
273
274
275
static pgoff_t __get_first_dirty_index(struct address_space *mapping,
						pgoff_t pgofs, int whence)
{
	struct pagevec pvec;
	int nr_pages;

	if (whence != SEEK_DATA)
		return 0;

	/* find first dirty page index */
	pagevec_init(&pvec, 0);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
276
277
278
	nr_pages = pagevec_lookup_tag(&pvec, mapping, &pgofs,
					PAGECACHE_TAG_DIRTY, 1);
	pgofs = nr_pages ? pvec.pages[0]->index : LONG_MAX;
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
	pagevec_release(&pvec);
	return pgofs;
}

static bool __found_offset(block_t blkaddr, pgoff_t dirty, pgoff_t pgofs,
							int whence)
{
	switch (whence) {
	case SEEK_DATA:
		if ((blkaddr == NEW_ADDR && dirty == pgofs) ||
			(blkaddr != NEW_ADDR && blkaddr != NULL_ADDR))
			return true;
		break;
	case SEEK_HOLE:
		if (blkaddr == NULL_ADDR)
			return true;
		break;
	}
	return false;
}

300
301
302
303
304
static loff_t f2fs_seek_block(struct file *file, loff_t offset, int whence)
{
	struct inode *inode = file->f_mapping->host;
	loff_t maxbytes = inode->i_sb->s_maxbytes;
	struct dnode_of_data dn;
305
306
307
	pgoff_t pgofs, end_offset, dirty;
	loff_t data_ofs = offset;
	loff_t isize;
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
	int err = 0;

	mutex_lock(&inode->i_mutex);

	isize = i_size_read(inode);
	if (offset >= isize)
		goto fail;

	/* handle inline data case */
	if (f2fs_has_inline_data(inode)) {
		if (whence == SEEK_HOLE)
			data_ofs = isize;
		goto found;
	}

	pgofs = (pgoff_t)(offset >> PAGE_CACHE_SHIFT);

325
326
	dirty = __get_first_dirty_index(inode->i_mapping, pgofs, whence);

327
328
329
330
331
332
	for (; data_ofs < isize; data_ofs = pgofs << PAGE_CACHE_SHIFT) {
		set_new_dnode(&dn, inode, NULL, NULL, 0);
		err = get_dnode_of_data(&dn, pgofs, LOOKUP_NODE_RA);
		if (err && err != -ENOENT) {
			goto fail;
		} else if (err == -ENOENT) {
arter97's avatar
arter97 committed
333
			/* direct node does not exists */
334
335
336
337
338
339
340
341
342
			if (whence == SEEK_DATA) {
				pgofs = PGOFS_OF_NEXT_DNODE(pgofs,
							F2FS_I(inode));
				continue;
			} else {
				goto found;
			}
		}

343
		end_offset = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode));
344
345
346
347
348
349
350
351

		/* find data/hole in dnode block */
		for (; dn.ofs_in_node < end_offset;
				dn.ofs_in_node++, pgofs++,
				data_ofs = pgofs << PAGE_CACHE_SHIFT) {
			block_t blkaddr;
			blkaddr = datablock_addr(dn.node_page, dn.ofs_in_node);

352
			if (__found_offset(blkaddr, dirty, pgofs, whence)) {
353
354
355
356
357
358
359
360
361
362
				f2fs_put_dnode(&dn);
				goto found;
			}
		}
		f2fs_put_dnode(&dn);
	}

	if (whence == SEEK_DATA)
		goto fail;
found:
363
364
	if (whence == SEEK_HOLE && data_ofs > isize)
		data_ofs = isize;
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
	mutex_unlock(&inode->i_mutex);
	return vfs_setpos(file, data_ofs, maxbytes);
fail:
	mutex_unlock(&inode->i_mutex);
	return -ENXIO;
}

static loff_t f2fs_llseek(struct file *file, loff_t offset, int whence)
{
	struct inode *inode = file->f_mapping->host;
	loff_t maxbytes = inode->i_sb->s_maxbytes;

	switch (whence) {
	case SEEK_SET:
	case SEEK_CUR:
	case SEEK_END:
		return generic_file_llseek_size(file, offset, whence,
						maxbytes, i_size_read(inode));
	case SEEK_DATA:
	case SEEK_HOLE:
385
386
		if (offset < 0)
			return -ENXIO;
387
388
389
390
391
392
		return f2fs_seek_block(file, offset, whence);
	}

	return -EINVAL;
}

Jaegeuk Kim's avatar
Jaegeuk Kim committed
393
394
395
396
397
398
399
static int f2fs_file_mmap(struct file *file, struct vm_area_struct *vma)
{
	file_accessed(file);
	vma->vm_ops = &f2fs_file_vm_ops;
	return 0;
}

400
int truncate_data_blocks_range(struct dnode_of_data *dn, int count)
Jaegeuk Kim's avatar
Jaegeuk Kim committed
401
402
{
	int nr_free = 0, ofs = dn->ofs_in_node;
403
	struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
404
405
406
	struct f2fs_node *raw_node;
	__le32 *addr;

407
	raw_node = F2FS_NODE(dn->node_page);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
408
409
	addr = blkaddr_in_node(raw_node) + ofs;

Chris Fries's avatar
Chris Fries committed
410
	for (; count > 0; count--, addr++, dn->ofs_in_node++) {
Jaegeuk Kim's avatar
Jaegeuk Kim committed
411
412
413
414
415
416
417
418
419
		block_t blkaddr = le32_to_cpu(*addr);
		if (blkaddr == NULL_ADDR)
			continue;

		update_extent_cache(NULL_ADDR, dn);
		invalidate_blocks(sbi, blkaddr);
		nr_free++;
	}
	if (nr_free) {
420
		dec_valid_block_count(sbi, dn->inode, nr_free);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
421
422
423
424
		set_page_dirty(dn->node_page);
		sync_inode_page(dn);
	}
	dn->ofs_in_node = ofs;
425
426
427

	trace_f2fs_truncate_data_blocks_range(dn->inode, dn->nid,
					 dn->ofs_in_node, nr_free);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
428
429
430
431
432
433
434
435
436
437
438
439
440
	return nr_free;
}

void truncate_data_blocks(struct dnode_of_data *dn)
{
	truncate_data_blocks_range(dn, ADDRS_PER_BLOCK);
}

static void truncate_partial_data_page(struct inode *inode, u64 from)
{
	unsigned offset = from & (PAGE_CACHE_SIZE - 1);
	struct page *page;

441
442
443
	if (f2fs_has_inline_data(inode))
		return truncate_inline_data(inode, from);

Jaegeuk Kim's avatar
Jaegeuk Kim committed
444
445
446
	if (!offset)
		return;

447
	page = find_data_page(inode, from >> PAGE_CACHE_SHIFT, false);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
448
449
450
451
	if (IS_ERR(page))
		return;

	lock_page(page);
452
453
454
455
	if (unlikely(!PageUptodate(page) ||
			page->mapping != inode->i_mapping))
		goto out;

456
	f2fs_wait_on_page_writeback(page, DATA);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
457
458
	zero_user(page, offset, PAGE_CACHE_SIZE - offset);
	set_page_dirty(page);
459
460

out:
Jaegeuk Kim's avatar
Jaegeuk Kim committed
461
462
463
	f2fs_put_page(page, 1);
}

464
int truncate_blocks(struct inode *inode, u64 from, bool lock)
Jaegeuk Kim's avatar
Jaegeuk Kim committed
465
{
466
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
467
468
469
	unsigned int blocksize = inode->i_sb->s_blocksize;
	struct dnode_of_data dn;
	pgoff_t free_from;
470
	int count = 0, err = 0;
Jaegeuk Kim's avatar
Jaegeuk Kim committed
471

472
473
	trace_f2fs_truncate_blocks_enter(inode, from);

474
475
476
	if (f2fs_has_inline_data(inode))
		goto done;

Jaegeuk Kim's avatar
Jaegeuk Kim committed
477
478
479
	free_from = (pgoff_t)
			((from + blocksize - 1) >> (sbi->log_blocksize));

480
481
	if (lock)
		f2fs_lock_op(sbi);
482

Jaegeuk Kim's avatar
Jaegeuk Kim committed
483
	set_new_dnode(&dn, inode, NULL, NULL, 0);
484
	err = get_dnode_of_data(&dn, free_from, LOOKUP_NODE);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
485
486
487
	if (err) {
		if (err == -ENOENT)
			goto free_next;
488
489
		if (lock)
			f2fs_unlock_op(sbi);
490
		trace_f2fs_truncate_blocks_exit(inode, err);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
491
492
493
		return err;
	}

494
495
496
	/* writepage can convert inline_data under get_donde_of_data */
	if (f2fs_has_inline_data(inode)) {
		f2fs_put_dnode(&dn);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
497
		goto unlock_done;
498
499
	}

500
	count = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode));
Jaegeuk Kim's avatar
Jaegeuk Kim committed
501
502

	count -= dn.ofs_in_node;
503
	f2fs_bug_on(sbi, count < 0);
504

Jaegeuk Kim's avatar
Jaegeuk Kim committed
505
506
507
508
509
510
511
512
	if (dn.ofs_in_node || IS_INODE(dn.node_page)) {
		truncate_data_blocks_range(&dn, count);
		free_from += count;
	}

	f2fs_put_dnode(&dn);
free_next:
	err = truncate_inode_blocks(inode, free_from);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
513
unlock_done:
514
515
	if (lock)
		f2fs_unlock_op(sbi);
516
done:
Jaegeuk Kim's avatar
Jaegeuk Kim committed
517
518
519
	/* lastly zero out the first data page */
	truncate_partial_data_page(inode, from);

520
	trace_f2fs_truncate_blocks_exit(inode, err);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
521
522
523
524
525
526
527
528
529
	return err;
}

void f2fs_truncate(struct inode *inode)
{
	if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
				S_ISLNK(inode->i_mode)))
		return;

530
531
	trace_f2fs_truncate(inode);

532
	if (!truncate_blocks(inode, i_size_read(inode), true)) {
Jaegeuk Kim's avatar
Jaegeuk Kim committed
533
534
535
536
537
		inode->i_mtime = inode->i_ctime = CURRENT_TIME;
		mark_inode_dirty(inode);
	}
}

538
int f2fs_getattr(struct vfsmount *mnt,
Jaegeuk Kim's avatar
Jaegeuk Kim committed
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
			 struct dentry *dentry, struct kstat *stat)
{
	struct inode *inode = dentry->d_inode;
	generic_fillattr(inode, stat);
	stat->blocks <<= 3;
	return 0;
}

#ifdef CONFIG_F2FS_FS_POSIX_ACL
static void __setattr_copy(struct inode *inode, const struct iattr *attr)
{
	struct f2fs_inode_info *fi = F2FS_I(inode);
	unsigned int ia_valid = attr->ia_valid;

	if (ia_valid & ATTR_UID)
		inode->i_uid = attr->ia_uid;
	if (ia_valid & ATTR_GID)
		inode->i_gid = attr->ia_gid;
	if (ia_valid & ATTR_ATIME)
		inode->i_atime = timespec_trunc(attr->ia_atime,
						inode->i_sb->s_time_gran);
	if (ia_valid & ATTR_MTIME)
		inode->i_mtime = timespec_trunc(attr->ia_mtime,
						inode->i_sb->s_time_gran);
	if (ia_valid & ATTR_CTIME)
		inode->i_ctime = timespec_trunc(attr->ia_ctime,
						inode->i_sb->s_time_gran);
	if (ia_valid & ATTR_MODE) {
		umode_t mode = attr->ia_mode;

		if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
			mode &= ~S_ISGID;
		set_acl_inode(fi, mode);
	}
}
#else
#define __setattr_copy setattr_copy
#endif

int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
{
	struct inode *inode = dentry->d_inode;
	struct f2fs_inode_info *fi = F2FS_I(inode);
	int err;

	err = inode_change_ok(inode, attr);
	if (err)
		return err;

588
	if (attr->ia_valid & ATTR_SIZE) {
589
		err = f2fs_convert_inline_data(inode, attr->ia_size, NULL);
590
591
		if (err)
			return err;
592

593
594
595
596
597
598
599
600
601
602
603
		if (attr->ia_size != i_size_read(inode)) {
			truncate_setsize(inode, attr->ia_size);
			f2fs_truncate(inode);
			f2fs_balance_fs(F2FS_I_SB(inode));
		} else {
			/*
			 * giving a chance to truncate blocks past EOF which
			 * are fallocated with FALLOC_FL_KEEP_SIZE.
			 */
			f2fs_truncate(inode);
		}
Jaegeuk Kim's avatar
Jaegeuk Kim committed
604
605
606
607
608
	}

	__setattr_copy(inode, attr);

	if (attr->ia_valid & ATTR_MODE) {
609
		err = posix_acl_chmod(inode, get_inode_mode(inode));
Jaegeuk Kim's avatar
Jaegeuk Kim committed
610
611
612
613
614
615
616
617
618
619
620
621
622
623
		if (err || is_inode_flag_set(fi, FI_ACL_MODE)) {
			inode->i_mode = fi->i_acl_mode;
			clear_inode_flag(fi, FI_ACL_MODE);
		}
	}

	mark_inode_dirty(inode);
	return err;
}

const struct inode_operations f2fs_file_inode_operations = {
	.getattr	= f2fs_getattr,
	.setattr	= f2fs_setattr,
	.get_acl	= f2fs_get_acl,
624
	.set_acl	= f2fs_set_acl,
Jaegeuk Kim's avatar
Jaegeuk Kim committed
625
626
627
628
629
630
#ifdef CONFIG_F2FS_FS_XATTR
	.setxattr	= generic_setxattr,
	.getxattr	= generic_getxattr,
	.listxattr	= f2fs_listxattr,
	.removexattr	= generic_removexattr,
#endif
Jaegeuk Kim's avatar
Jaegeuk Kim committed
631
	.fiemap		= f2fs_fiemap,
Jaegeuk Kim's avatar
Jaegeuk Kim committed
632
633
634
635
636
};

static void fill_zero(struct inode *inode, pgoff_t index,
					loff_t start, loff_t len)
{
637
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
638
639
640
641
642
	struct page *page;

	if (!len)
		return;

643
644
	f2fs_balance_fs(sbi);

645
	f2fs_lock_op(sbi);
646
	page = get_new_data_page(inode, NULL, index, false);
647
	f2fs_unlock_op(sbi);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
648
649

	if (!IS_ERR(page)) {
650
		f2fs_wait_on_page_writeback(page, DATA);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
651
652
653
654
655
656
657
658
659
660
661
662
663
		zero_user(page, start, len);
		set_page_dirty(page);
		f2fs_put_page(page, 1);
	}
}

int truncate_hole(struct inode *inode, pgoff_t pg_start, pgoff_t pg_end)
{
	pgoff_t index;
	int err;

	for (index = pg_start; index < pg_end; index++) {
		struct dnode_of_data dn;
664

Jaegeuk Kim's avatar
Jaegeuk Kim committed
665
		set_new_dnode(&dn, inode, NULL, NULL, 0);
666
		err = get_dnode_of_data(&dn, index, LOOKUP_NODE);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
667
668
669
670
671
672
673
674
675
676
677
678
679
		if (err) {
			if (err == -ENOENT)
				continue;
			return err;
		}

		if (dn.data_blkaddr != NULL_ADDR)
			truncate_data_blocks_range(&dn, 1);
		f2fs_put_dnode(&dn);
	}
	return 0;
}

680
static int punch_hole(struct inode *inode, loff_t offset, loff_t len)
Jaegeuk Kim's avatar
Jaegeuk Kim committed
681
682
683
684
685
{
	pgoff_t pg_start, pg_end;
	loff_t off_start, off_end;
	int ret = 0;

686
687
688
689
690
691
692
	if (!S_ISREG(inode->i_mode))
		return -EOPNOTSUPP;

	/* skip punching hole beyond i_size */
	if (offset >= inode->i_size)
		return ret;

693
	ret = f2fs_convert_inline_data(inode, MAX_INLINE_DATA + 1, NULL);
694
695
	if (ret)
		return ret;
696

Jaegeuk Kim's avatar
Jaegeuk Kim committed
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
	pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
	pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;

	off_start = offset & (PAGE_CACHE_SIZE - 1);
	off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);

	if (pg_start == pg_end) {
		fill_zero(inode, pg_start, off_start,
						off_end - off_start);
	} else {
		if (off_start)
			fill_zero(inode, pg_start++, off_start,
					PAGE_CACHE_SIZE - off_start);
		if (off_end)
			fill_zero(inode, pg_end, 0, off_end);

		if (pg_start < pg_end) {
			struct address_space *mapping = inode->i_mapping;
			loff_t blk_start, blk_end;
716
			struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
717
718

			f2fs_balance_fs(sbi);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
719
720
721
722
723

			blk_start = pg_start << PAGE_CACHE_SHIFT;
			blk_end = pg_end << PAGE_CACHE_SHIFT;
			truncate_inode_pages_range(mapping, blk_start,
					blk_end - 1);
724

725
			f2fs_lock_op(sbi);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
726
			ret = truncate_hole(inode, pg_start, pg_end);
727
			f2fs_unlock_op(sbi);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
728
729
730
731
732
733
734
735
736
		}
	}

	return ret;
}

static int expand_inode_data(struct inode *inode, loff_t offset,
					loff_t len, int mode)
{
737
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
738
739
740
741
742
	pgoff_t index, pg_start, pg_end;
	loff_t new_size = i_size_read(inode);
	loff_t off_start, off_end;
	int ret = 0;

743
744
	f2fs_balance_fs(sbi);

Jaegeuk Kim's avatar
Jaegeuk Kim committed
745
746
747
748
	ret = inode_newsize_ok(inode, (len + offset));
	if (ret)
		return ret;

749
	ret = f2fs_convert_inline_data(inode, offset + len, NULL);
750
751
752
	if (ret)
		return ret;

Jaegeuk Kim's avatar
Jaegeuk Kim committed
753
754
755
756
757
758
	pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
	pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;

	off_start = offset & (PAGE_CACHE_SIZE - 1);
	off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);

759
760
	f2fs_lock_op(sbi);

Jaegeuk Kim's avatar
Jaegeuk Kim committed
761
762
763
	for (index = pg_start; index <= pg_end; index++) {
		struct dnode_of_data dn;

764
765
766
		if (index == pg_end && !off_end)
			goto noalloc;

Jaegeuk Kim's avatar
Jaegeuk Kim committed
767
		set_new_dnode(&dn, inode, NULL, NULL, 0);
768
769
		ret = f2fs_reserve_block(&dn, index);
		if (ret)
Jaegeuk Kim's avatar
Jaegeuk Kim committed
770
			break;
771
noalloc:
Jaegeuk Kim's avatar
Jaegeuk Kim committed
772
773
774
775
776
777
778
779
780
781
782
783
784
785
		if (pg_start == pg_end)
			new_size = offset + len;
		else if (index == pg_start && off_start)
			new_size = (index + 1) << PAGE_CACHE_SHIFT;
		else if (index == pg_end)
			new_size = (index << PAGE_CACHE_SHIFT) + off_end;
		else
			new_size += PAGE_CACHE_SIZE;
	}

	if (!(mode & FALLOC_FL_KEEP_SIZE) &&
		i_size_read(inode) < new_size) {
		i_size_write(inode, new_size);
		mark_inode_dirty(inode);
786
		update_inode_page(inode);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
787
	}
788
	f2fs_unlock_op(sbi);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
789
790
791
792
793
794
795

	return ret;
}

static long f2fs_fallocate(struct file *file, int mode,
				loff_t offset, loff_t len)
{
796
	struct inode *inode = file_inode(file);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
797
798
799
800
801
	long ret;

	if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
		return -EOPNOTSUPP;

802
803
	mutex_lock(&inode->i_mutex);

Jaegeuk Kim's avatar
Jaegeuk Kim committed
804
	if (mode & FALLOC_FL_PUNCH_HOLE)
805
		ret = punch_hole(inode, offset, len);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
806
807
808
	else
		ret = expand_inode_data(inode, offset, len, mode);

809
810
811
812
	if (!ret) {
		inode->i_mtime = inode->i_ctime = CURRENT_TIME;
		mark_inode_dirty(inode);
	}
813
814
815

	mutex_unlock(&inode->i_mutex);

816
	trace_f2fs_fallocate(inode, mode, offset, len, ret);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
	return ret;
}

#define F2FS_REG_FLMASK		(~(FS_DIRSYNC_FL | FS_TOPDIR_FL))
#define F2FS_OTHER_FLMASK	(FS_NODUMP_FL | FS_NOATIME_FL)

static inline __u32 f2fs_mask_flags(umode_t mode, __u32 flags)
{
	if (S_ISDIR(mode))
		return flags;
	else if (S_ISREG(mode))
		return flags & F2FS_REG_FLMASK;
	else
		return flags & F2FS_OTHER_FLMASK;
}

833
static int f2fs_ioc_getflags(struct file *filp, unsigned long arg)
Jaegeuk Kim's avatar
Jaegeuk Kim committed
834
{
835
	struct inode *inode = file_inode(filp);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
836
	struct f2fs_inode_info *fi = F2FS_I(inode);
837
838
839
	unsigned int flags = fi->i_flags & FS_FL_USER_VISIBLE;
	return put_user(flags, (int __user *)arg);
}
Jaegeuk Kim's avatar
Jaegeuk Kim committed
840

841
842
843
844
845
846
847
static int f2fs_ioc_setflags(struct file *filp, unsigned long arg)
{
	struct inode *inode = file_inode(filp);
	struct f2fs_inode_info *fi = F2FS_I(inode);
	unsigned int flags = fi->i_flags & FS_FL_USER_VISIBLE;
	unsigned int oldflags;
	int ret;
Jaegeuk Kim's avatar
Jaegeuk Kim committed
848

849
850
851
	ret = mnt_want_write_file(filp);
	if (ret)
		return ret;
Jaegeuk Kim's avatar
Jaegeuk Kim committed
852

853
854
855
856
	if (!inode_owner_or_capable(inode)) {
		ret = -EACCES;
		goto out;
	}
Jaegeuk Kim's avatar
Jaegeuk Kim committed
857

858
859
860
861
	if (get_user(flags, (int __user *)arg)) {
		ret = -EFAULT;
		goto out;
	}
Jaegeuk Kim's avatar
Jaegeuk Kim committed
862

863
	flags = f2fs_mask_flags(inode->i_mode, flags);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
864

865
	mutex_lock(&inode->i_mutex);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
866

867
	oldflags = fi->i_flags;
Jaegeuk Kim's avatar
Jaegeuk Kim committed
868

869
870
871
872
873
	if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
		if (!capable(CAP_LINUX_IMMUTABLE)) {
			mutex_unlock(&inode->i_mutex);
			ret = -EPERM;
			goto out;
Jaegeuk Kim's avatar
Jaegeuk Kim committed
874
		}
875
	}
Jaegeuk Kim's avatar
Jaegeuk Kim committed
876

877
878
879
880
	flags = flags & FS_FL_USER_MODIFIABLE;
	flags |= oldflags & ~FS_FL_USER_MODIFIABLE;
	fi->i_flags = flags;
	mutex_unlock(&inode->i_mutex);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
881

882
883
884
	f2fs_set_inode_flags(inode);
	inode->i_ctime = CURRENT_TIME;
	mark_inode_dirty(inode);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
885
out:
886
887
888
	mnt_drop_write_file(filp);
	return ret;
}
889

Jaegeuk Kim's avatar
Jaegeuk Kim committed
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
static int f2fs_ioc_start_atomic_write(struct file *filp)
{
	struct inode *inode = file_inode(filp);
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);

	if (!inode_owner_or_capable(inode))
		return -EACCES;

	f2fs_balance_fs(sbi);

	set_inode_flag(F2FS_I(inode), FI_ATOMIC_FILE);

	return f2fs_convert_inline_data(inode, MAX_INLINE_DATA + 1, NULL);
}

static int f2fs_ioc_commit_atomic_write(struct file *filp)
{
	struct inode *inode = file_inode(filp);
	int ret;

	if (!inode_owner_or_capable(inode))
		return -EACCES;

913
914
915
	if (f2fs_is_volatile_file(inode))
		return 0;

Jaegeuk Kim's avatar
Jaegeuk Kim committed
916
917
918
919
920
921
922
923
924
925
926
927
	ret = mnt_want_write_file(filp);
	if (ret)
		return ret;

	if (f2fs_is_atomic_file(inode))
		commit_inmem_pages(inode, false);

	ret = f2fs_sync_file(filp, 0, LONG_MAX, 0);
	mnt_drop_write_file(filp);
	return ret;
}

928
929
930
931
932
933
934
935
936
937
938
static int f2fs_ioc_start_volatile_write(struct file *filp)
{
	struct inode *inode = file_inode(filp);

	if (!inode_owner_or_capable(inode))
		return -EACCES;

	set_inode_flag(F2FS_I(inode), FI_VOLATILE_FILE);
	return 0;
}

939
940
941
942
943
944
945
static int f2fs_ioc_fitrim(struct file *filp, unsigned long arg)
{
	struct inode *inode = file_inode(filp);
	struct super_block *sb = inode->i_sb;
	struct request_queue *q = bdev_get_queue(sb->s_bdev);
	struct fstrim_range range;
	int ret;
946

947
948
	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;
949

950
951
	if (!blk_queue_discard(q))
		return -EOPNOTSUPP;
952

953
954
955
	if (copy_from_user(&range, (struct fstrim_range __user *)arg,
				sizeof(range)))
		return -EFAULT;
956

957
958
959
960
961
	range.minlen = max((unsigned int)range.minlen,
				q->limits.discard_granularity);
	ret = f2fs_trim_fs(F2FS_SB(sb), &range);
	if (ret < 0)
		return ret;
962

963
964
965
966
967
968
969
970
971
972
973
974
975
	if (copy_to_user((struct fstrim_range __user *)arg, &range,
				sizeof(range)))
		return -EFAULT;
	return 0;
}

long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
	switch (cmd) {
	case F2FS_IOC_GETFLAGS:
		return f2fs_ioc_getflags(filp, arg);
	case F2FS_IOC_SETFLAGS:
		return f2fs_ioc_setflags(filp, arg);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
976
977
978
979
	case F2FS_IOC_START_ATOMIC_WRITE:
		return f2fs_ioc_start_atomic_write(filp);
	case F2FS_IOC_COMMIT_ATOMIC_WRITE:
		return f2fs_ioc_commit_atomic_write(filp);
980
981
	case F2FS_IOC_START_VOLATILE_WRITE:
		return f2fs_ioc_start_volatile_write(filp);
982
983
	case FITRIM:
		return f2fs_ioc_fitrim(filp, arg);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
984
985
986
987
988
	default:
		return -ENOTTY;
	}
}

989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
#ifdef CONFIG_COMPAT
long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	switch (cmd) {
	case F2FS_IOC32_GETFLAGS:
		cmd = F2FS_IOC_GETFLAGS;
		break;
	case F2FS_IOC32_SETFLAGS:
		cmd = F2FS_IOC_SETFLAGS;
		break;
	default:
		return -ENOIOCTLCMD;
	}
	return f2fs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
}
#endif

Jaegeuk Kim's avatar
Jaegeuk Kim committed
1006
const struct file_operations f2fs_file_operations = {
1007
	.llseek		= f2fs_llseek,
1008
	.read		= new_sync_read,
1009
	.write		= new_sync_write,
1010
	.read_iter	= generic_file_read_iter,
1011
	.write_iter	= generic_file_write_iter,
Jaegeuk Kim's avatar
Jaegeuk Kim committed
1012
1013
1014
1015
1016
	.open		= generic_file_open,
	.mmap		= f2fs_file_mmap,
	.fsync		= f2fs_sync_file,
	.fallocate	= f2fs_fallocate,
	.unlocked_ioctl	= f2fs_ioctl,
1017
1018
1019
#ifdef CONFIG_COMPAT
	.compat_ioctl	= f2fs_compat_ioctl,
#endif
Jaegeuk Kim's avatar
Jaegeuk Kim committed
1020
	.splice_read	= generic_file_splice_read,
Al Viro's avatar
Al Viro committed
1021
	.splice_write	= iter_file_splice_write,
Jaegeuk Kim's avatar
Jaegeuk Kim committed
1022
};