file.c 20.1 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
	int err;
Jaegeuk Kim's avatar
Jaegeuk Kim committed
39
40
41
42
43

	f2fs_balance_fs(sbi);

	sb_start_pagefault(inode->i_sb);

44
45
46
47
48
	/* 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
49
	/* block allocation */
50
	f2fs_lock_op(sbi);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
51
	set_new_dnode(&dn, inode, NULL, NULL, 0);
52
	err = f2fs_reserve_block(&dn, page->index);
53
	f2fs_unlock_op(sbi);
54
55
	if (err)
		goto out;
Jaegeuk Kim's avatar
Jaegeuk Kim committed
56

57
	file_update_time(vma->vm_file);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
58
	lock_page(page);
59
	if (unlikely(page->mapping != inode->i_mapping ||
60
			page_offset(page) > i_size_read(inode) ||
61
			!PageUptodate(page))) {
Jaegeuk Kim's avatar
Jaegeuk Kim committed
62
63
64
65
66
67
68
69
70
		unlock_page(page);
		err = -EFAULT;
		goto out;
	}

	/*
	 * check to see if the page is mapped already (no holes)
	 */
	if (PageMappedToDisk(page))
71
		goto mapped;
Jaegeuk Kim's avatar
Jaegeuk Kim committed
72
73
74
75
76
77
78
79
80
81

	/* 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);

82
	trace_f2fs_vm_page_mkwrite(page, DATA);
83
84
mapped:
	/* fill the page */
85
	f2fs_wait_on_page_writeback(page, DATA);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
86
87
88
89
90
91
out:
	sb_end_pagefault(inode->i_sb);
	return block_page_mkwrite_return(err);
}

static const struct vm_operations_struct f2fs_file_vm_ops = {
92
	.fault		= filemap_fault,
93
	.map_pages	= filemap_map_pages,
94
95
	.page_mkwrite	= f2fs_vm_page_mkwrite,
	.remap_pages	= generic_file_remap_pages,
Jaegeuk Kim's avatar
Jaegeuk Kim committed
96
97
};

98
99
100
101
102
103
104
105
106
107
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;

108
109
110
111
	if (update_dent_inode(inode, &dentry->d_name)) {
		dput(dentry);
		return 0;
	}
112

113
114
	*pino = parent_ino(dentry);
	dput(dentry);
115
116
117
	return 1;
}

118
119
static inline bool need_do_checkpoint(struct inode *inode)
{
120
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
	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
137
138
139
int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
{
	struct inode *inode = file->f_mapping->host;
140
	struct f2fs_inode_info *fi = F2FS_I(inode);
141
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
142
143
144
	int ret = 0;
	bool need_cp = false;
	struct writeback_control wbc = {
145
		.sync_mode = WB_SYNC_ALL,
Jaegeuk Kim's avatar
Jaegeuk Kim committed
146
147
148
149
		.nr_to_write = LONG_MAX,
		.for_reclaim = 0,
	};

150
	if (unlikely(f2fs_readonly(inode->i_sb)))
151
152
		return 0;

153
	trace_f2fs_sync_file_enter(inode);
154
155
156
157
158

	/* if fdatasync is triggered, let's do in-place-update */
	if (datasync)
		set_inode_flag(fi, FI_NEED_IPU);

Jaegeuk Kim's avatar
Jaegeuk Kim committed
159
	ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
160
161
	if (datasync)
		clear_inode_flag(fi, FI_NEED_IPU);
162
163
	if (ret) {
		trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
164
		return ret;
165
	}
Jaegeuk Kim's avatar
Jaegeuk Kim committed
166

167
168
169
170
171
172
173
174
175
176
177
	/*
	 * if there is no written data, don't waste time to write recovery info.
	 */
	if (!is_inode_flag_set(fi, FI_APPEND_WRITE) &&
		!exist_written_data(sbi, inode->i_ino, APPEND_INO)) {
		if (is_inode_flag_set(fi, FI_UPDATE_WRITE) ||
			exist_written_data(sbi, inode->i_ino, UPDATE_INO))
			goto flush_out;
		goto out;
	}

178
179
180
	/* guarantee free sections for fsync */
	f2fs_balance_fs(sbi);

181
182
183
184
	/*
	 * Both of fdatasync() and fsync() are able to be recovered from
	 * sudden-power-off.
	 */
185
186
	down_read(&fi->i_sem);
	need_cp = need_do_checkpoint(inode);
187
188
	up_read(&fi->i_sem);

Jaegeuk Kim's avatar
Jaegeuk Kim committed
189
	if (need_cp) {
190
191
		nid_t pino;

Jaegeuk Kim's avatar
Jaegeuk Kim committed
192
193
		/* all the dirty node pages should be flushed for POR */
		ret = f2fs_sync_fs(inode->i_sb, 1);
194
195
196

		down_write(&fi->i_sem);
		F2FS_I(inode)->xattr_ver = 0;
197
198
199
200
		if (file_wrong_pino(inode) && inode->i_nlink == 1 &&
					get_parent_ino(inode, &pino)) {
			F2FS_I(inode)->i_pino = pino;
			file_got_pino(inode);
201
			up_write(&fi->i_sem);
202
203
204
205
			mark_inode_dirty_sync(inode);
			ret = f2fs_write_inode(inode, NULL);
			if (ret)
				goto out;
206
207
		} else {
			up_write(&fi->i_sem);
208
		}
Jaegeuk Kim's avatar
Jaegeuk Kim committed
209
	} else {
210
211
		/* if there is no written node page, write its inode page */
		while (!sync_node_pages(sbi, inode->i_ino, &wbc)) {
212
213
			if (fsync_mark_done(sbi, inode->i_ino))
				goto out;
214
			mark_inode_dirty_sync(inode);
215
216
217
218
			ret = f2fs_write_inode(inode, NULL);
			if (ret)
				goto out;
		}
219
220
221
		ret = wait_on_node_pages_writeback(sbi, inode->i_ino);
		if (ret)
			goto out;
222
223
224
225
226
227
228

		/* once recovery info is written, don't need to tack this */
		remove_dirty_inode(sbi, inode->i_ino, APPEND_INO);
		clear_inode_flag(fi, FI_APPEND_WRITE);
flush_out:
		remove_dirty_inode(sbi, inode->i_ino, UPDATE_INO);
		clear_inode_flag(fi, FI_UPDATE_WRITE);
229
		ret = f2fs_issue_flush(F2FS_I_SB(inode));
Jaegeuk Kim's avatar
Jaegeuk Kim committed
230
231
	}
out:
232
	trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
233
234
235
	return ret;
}

236
237
238
239
240
241
242
243
244
245
246
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
247
248
249
	nr_pages = pagevec_lookup_tag(&pvec, mapping, &pgofs,
					PAGECACHE_TAG_DIRTY, 1);
	pgofs = nr_pages ? pvec.pages[0]->index : LONG_MAX;
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
	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;
}

271
272
273
274
275
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;
276
277
278
	pgoff_t pgofs, end_offset, dirty;
	loff_t data_ofs = offset;
	loff_t isize;
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
	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);

296
297
	dirty = __get_first_dirty_index(inode->i_mapping, pgofs, whence);

298
299
300
301
302
303
	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
304
			/* direct node does not exists */
305
306
307
308
309
310
311
312
313
			if (whence == SEEK_DATA) {
				pgofs = PGOFS_OF_NEXT_DNODE(pgofs,
							F2FS_I(inode));
				continue;
			} else {
				goto found;
			}
		}

314
		end_offset = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode));
315
316
317
318
319
320
321
322

		/* 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);

323
			if (__found_offset(blkaddr, dirty, pgofs, whence)) {
324
325
326
327
328
329
330
331
332
333
				f2fs_put_dnode(&dn);
				goto found;
			}
		}
		f2fs_put_dnode(&dn);
	}

	if (whence == SEEK_DATA)
		goto fail;
found:
334
335
	if (whence == SEEK_HOLE && data_ofs > isize)
		data_ofs = isize;
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
	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:
		return f2fs_seek_block(file, offset, whence);
	}

	return -EINVAL;
}

Jaegeuk Kim's avatar
Jaegeuk Kim committed
362
363
364
365
366
367
368
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;
}

369
int truncate_data_blocks_range(struct dnode_of_data *dn, int count)
Jaegeuk Kim's avatar
Jaegeuk Kim committed
370
371
{
	int nr_free = 0, ofs = dn->ofs_in_node;
372
	struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
373
374
375
	struct f2fs_node *raw_node;
	__le32 *addr;

376
	raw_node = F2FS_NODE(dn->node_page);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
377
378
	addr = blkaddr_in_node(raw_node) + ofs;

Chris Fries's avatar
Chris Fries committed
379
	for (; count > 0; count--, addr++, dn->ofs_in_node++) {
Jaegeuk Kim's avatar
Jaegeuk Kim committed
380
381
382
383
384
385
386
387
388
		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) {
389
		dec_valid_block_count(sbi, dn->inode, nr_free);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
390
391
392
393
		set_page_dirty(dn->node_page);
		sync_inode_page(dn);
	}
	dn->ofs_in_node = ofs;
394
395
396

	trace_f2fs_truncate_data_blocks_range(dn->inode, dn->nid,
					 dn->ofs_in_node, nr_free);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
397
398
399
400
401
402
403
404
405
406
407
408
409
	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;

410
411
412
	if (f2fs_has_inline_data(inode))
		return truncate_inline_data(inode, from);

Jaegeuk Kim's avatar
Jaegeuk Kim committed
413
414
415
	if (!offset)
		return;

416
	page = find_data_page(inode, from >> PAGE_CACHE_SHIFT, false);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
417
418
419
420
	if (IS_ERR(page))
		return;

	lock_page(page);
421
422
423
424
	if (unlikely(!PageUptodate(page) ||
			page->mapping != inode->i_mapping))
		goto out;

425
	f2fs_wait_on_page_writeback(page, DATA);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
426
427
	zero_user(page, offset, PAGE_CACHE_SIZE - offset);
	set_page_dirty(page);
428
429

out:
Jaegeuk Kim's avatar
Jaegeuk Kim committed
430
431
432
	f2fs_put_page(page, 1);
}

433
int truncate_blocks(struct inode *inode, u64 from, bool lock)
Jaegeuk Kim's avatar
Jaegeuk Kim committed
434
{
435
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
436
437
438
	unsigned int blocksize = inode->i_sb->s_blocksize;
	struct dnode_of_data dn;
	pgoff_t free_from;
439
	int count = 0, err = 0;
Jaegeuk Kim's avatar
Jaegeuk Kim committed
440

441
442
	trace_f2fs_truncate_blocks_enter(inode, from);

443
444
445
	if (f2fs_has_inline_data(inode))
		goto done;

Jaegeuk Kim's avatar
Jaegeuk Kim committed
446
447
448
	free_from = (pgoff_t)
			((from + blocksize - 1) >> (sbi->log_blocksize));

449
450
	if (lock)
		f2fs_lock_op(sbi);
451

Jaegeuk Kim's avatar
Jaegeuk Kim committed
452
	set_new_dnode(&dn, inode, NULL, NULL, 0);
453
	err = get_dnode_of_data(&dn, free_from, LOOKUP_NODE);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
454
455
456
	if (err) {
		if (err == -ENOENT)
			goto free_next;
457
458
		if (lock)
			f2fs_unlock_op(sbi);
459
		trace_f2fs_truncate_blocks_exit(inode, err);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
460
461
462
		return err;
	}

463
	count = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode));
Jaegeuk Kim's avatar
Jaegeuk Kim committed
464
465

	count -= dn.ofs_in_node;
466
	f2fs_bug_on(count < 0);
467

Jaegeuk Kim's avatar
Jaegeuk Kim committed
468
469
470
471
472
473
474
475
	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);
476
477
	if (lock)
		f2fs_unlock_op(sbi);
478
done:
Jaegeuk Kim's avatar
Jaegeuk Kim committed
479
480
481
	/* lastly zero out the first data page */
	truncate_partial_data_page(inode, from);

482
	trace_f2fs_truncate_blocks_exit(inode, err);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
483
484
485
486
487
488
489
490
491
	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;

492
493
	trace_f2fs_truncate(inode);

494
	if (!truncate_blocks(inode, i_size_read(inode), true)) {
Jaegeuk Kim's avatar
Jaegeuk Kim committed
495
496
497
498
499
		inode->i_mtime = inode->i_ctime = CURRENT_TIME;
		mark_inode_dirty(inode);
	}
}

500
int f2fs_getattr(struct vfsmount *mnt,
Jaegeuk Kim's avatar
Jaegeuk Kim committed
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
			 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;

	if ((attr->ia_valid & ATTR_SIZE) &&
			attr->ia_size != i_size_read(inode)) {
552
		err = f2fs_convert_inline_data(inode, attr->ia_size, NULL);
553
554
		if (err)
			return err;
555

Jaegeuk Kim's avatar
Jaegeuk Kim committed
556
		truncate_setsize(inode, attr->ia_size);
557
		f2fs_truncate(inode);
558
		f2fs_balance_fs(F2FS_I_SB(inode));
Jaegeuk Kim's avatar
Jaegeuk Kim committed
559
560
561
562
563
	}

	__setattr_copy(inode, attr);

	if (attr->ia_valid & ATTR_MODE) {
564
		err = posix_acl_chmod(inode, get_inode_mode(inode));
Jaegeuk Kim's avatar
Jaegeuk Kim committed
565
566
567
568
569
570
571
572
573
574
575
576
577
578
		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,
579
	.set_acl	= f2fs_set_acl,
Jaegeuk Kim's avatar
Jaegeuk Kim committed
580
581
582
583
584
585
#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
586
	.fiemap		= f2fs_fiemap,
Jaegeuk Kim's avatar
Jaegeuk Kim committed
587
588
589
590
591
};

static void fill_zero(struct inode *inode, pgoff_t index,
					loff_t start, loff_t len)
{
592
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
593
594
595
596
597
	struct page *page;

	if (!len)
		return;

598
599
	f2fs_balance_fs(sbi);

600
	f2fs_lock_op(sbi);
601
	page = get_new_data_page(inode, NULL, index, false);
602
	f2fs_unlock_op(sbi);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
603
604

	if (!IS_ERR(page)) {
605
		f2fs_wait_on_page_writeback(page, DATA);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
606
607
608
609
610
611
612
613
614
615
616
617
618
		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;
619

Jaegeuk Kim's avatar
Jaegeuk Kim committed
620
		set_new_dnode(&dn, inode, NULL, NULL, 0);
621
		err = get_dnode_of_data(&dn, index, LOOKUP_NODE);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
622
623
624
625
626
627
628
629
630
631
632
633
634
		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;
}

635
static int punch_hole(struct inode *inode, loff_t offset, loff_t len)
Jaegeuk Kim's avatar
Jaegeuk Kim committed
636
637
638
639
640
{
	pgoff_t pg_start, pg_end;
	loff_t off_start, off_end;
	int ret = 0;

641
	ret = f2fs_convert_inline_data(inode, MAX_INLINE_DATA + 1, NULL);
642
643
	if (ret)
		return ret;
644

Jaegeuk Kim's avatar
Jaegeuk Kim committed
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
	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;
664
			struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
665
666

			f2fs_balance_fs(sbi);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
667
668
669
670
671

			blk_start = pg_start << PAGE_CACHE_SHIFT;
			blk_end = pg_end << PAGE_CACHE_SHIFT;
			truncate_inode_pages_range(mapping, blk_start,
					blk_end - 1);
672

673
			f2fs_lock_op(sbi);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
674
			ret = truncate_hole(inode, pg_start, pg_end);
675
			f2fs_unlock_op(sbi);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
676
677
678
679
680
681
682
683
684
		}
	}

	return ret;
}

static int expand_inode_data(struct inode *inode, loff_t offset,
					loff_t len, int mode)
{
685
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
686
687
688
689
690
	pgoff_t index, pg_start, pg_end;
	loff_t new_size = i_size_read(inode);
	loff_t off_start, off_end;
	int ret = 0;

691
692
	f2fs_balance_fs(sbi);

Jaegeuk Kim's avatar
Jaegeuk Kim committed
693
694
695
696
	ret = inode_newsize_ok(inode, (len + offset));
	if (ret)
		return ret;

697
	ret = f2fs_convert_inline_data(inode, offset + len, NULL);
698
699
700
	if (ret)
		return ret;

Jaegeuk Kim's avatar
Jaegeuk Kim committed
701
702
703
704
705
706
	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);

707
708
	f2fs_lock_op(sbi);

Jaegeuk Kim's avatar
Jaegeuk Kim committed
709
710
711
	for (index = pg_start; index <= pg_end; index++) {
		struct dnode_of_data dn;

712
713
714
		if (index == pg_end && !off_end)
			goto noalloc;

Jaegeuk Kim's avatar
Jaegeuk Kim committed
715
		set_new_dnode(&dn, inode, NULL, NULL, 0);
716
717
		ret = f2fs_reserve_block(&dn, index);
		if (ret)
Jaegeuk Kim's avatar
Jaegeuk Kim committed
718
			break;
719
noalloc:
Jaegeuk Kim's avatar
Jaegeuk Kim committed
720
721
722
723
724
725
726
727
728
729
730
731
732
733
		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);
734
		update_inode_page(inode);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
735
	}
736
	f2fs_unlock_op(sbi);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
737
738
739
740
741
742
743

	return ret;
}

static long f2fs_fallocate(struct file *file, int mode,
				loff_t offset, loff_t len)
{
744
	struct inode *inode = file_inode(file);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
745
746
747
748
749
	long ret;

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

750
751
	mutex_lock(&inode->i_mutex);

Jaegeuk Kim's avatar
Jaegeuk Kim committed
752
	if (mode & FALLOC_FL_PUNCH_HOLE)
753
		ret = punch_hole(inode, offset, len);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
754
755
756
	else
		ret = expand_inode_data(inode, offset, len, mode);

757
758
759
760
	if (!ret) {
		inode->i_mtime = inode->i_ctime = CURRENT_TIME;
		mark_inode_dirty(inode);
	}
761
762
763

	mutex_unlock(&inode->i_mutex);

764
	trace_f2fs_fallocate(inode, mode, offset, len, ret);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
	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;
}

long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
783
	struct inode *inode = file_inode(filp);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
784
785
786
787
788
	struct f2fs_inode_info *fi = F2FS_I(inode);
	unsigned int flags;
	int ret;

	switch (cmd) {
789
	case F2FS_IOC_GETFLAGS:
Jaegeuk Kim's avatar
Jaegeuk Kim committed
790
791
		flags = fi->i_flags & FS_FL_USER_VISIBLE;
		return put_user(flags, (int __user *) arg);
792
	case F2FS_IOC_SETFLAGS:
Jaegeuk Kim's avatar
Jaegeuk Kim committed
793
794
795
	{
		unsigned int oldflags;

796
		ret = mnt_want_write_file(filp);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
		if (ret)
			return ret;

		if (!inode_owner_or_capable(inode)) {
			ret = -EACCES;
			goto out;
		}

		if (get_user(flags, (int __user *) arg)) {
			ret = -EFAULT;
			goto out;
		}

		flags = f2fs_mask_flags(inode->i_mode, flags);

		mutex_lock(&inode->i_mutex);

		oldflags = fi->i_flags;

		if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
			if (!capable(CAP_LINUX_IMMUTABLE)) {
				mutex_unlock(&inode->i_mutex);
				ret = -EPERM;
				goto out;
			}
		}

		flags = flags & FS_FL_USER_MODIFIABLE;
		flags |= oldflags & ~FS_FL_USER_MODIFIABLE;
		fi->i_flags = flags;
		mutex_unlock(&inode->i_mutex);

		f2fs_set_inode_flags(inode);
		inode->i_ctime = CURRENT_TIME;
		mark_inode_dirty(inode);
out:
833
		mnt_drop_write_file(filp);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
834
835
836
837
838
839
840
		return ret;
	}
	default:
		return -ENOTTY;
	}
}

841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
#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
858
const struct file_operations f2fs_file_operations = {
859
	.llseek		= f2fs_llseek,
860
	.read		= new_sync_read,
861
	.write		= new_sync_write,
862
	.read_iter	= generic_file_read_iter,
863
	.write_iter	= generic_file_write_iter,
Jaegeuk Kim's avatar
Jaegeuk Kim committed
864
865
866
867
868
	.open		= generic_file_open,
	.mmap		= f2fs_file_mmap,
	.fsync		= f2fs_sync_file,
	.fallocate	= f2fs_fallocate,
	.unlocked_ioctl	= f2fs_ioctl,
869
870
871
#ifdef CONFIG_COMPAT
	.compat_ioctl	= f2fs_compat_ioctl,
#endif
Jaegeuk Kim's avatar
Jaegeuk Kim committed
872
	.splice_read	= generic_file_splice_read,
Al Viro's avatar
Al Viro committed
873
	.splice_write	= iter_file_splice_write,
Jaegeuk Kim's avatar
Jaegeuk Kim committed
874
};