file.c 23.1 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

	f2fs_balance_fs(sbi);

	sb_start_pagefault(inode->i_sb);
43 44

	f2fs_bug_on(sbi, f2fs_has_inline_data(inode));
45

Jaegeuk Kim's avatar
Jaegeuk Kim committed
46
	/* block allocation */
47
	f2fs_lock_op(sbi);
48
	set_new_dnode(&dn, inode, NULL, NULL, 0);
49
	err = f2fs_reserve_block(&dn, page->index);
50 51
	if (err) {
		f2fs_unlock_op(sbi);
52
		goto out;
53 54 55
	}
	f2fs_put_dnode(&dn);
	f2fs_unlock_op(sbi);
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);
142
	nid_t ino = inode->i_ino;
Jaegeuk Kim's avatar
Jaegeuk Kim committed
143 144 145
	int ret = 0;
	bool need_cp = false;
	struct writeback_control wbc = {
146
		.sync_mode = WB_SYNC_ALL,
Jaegeuk Kim's avatar
Jaegeuk Kim committed
147 148 149 150
		.nr_to_write = LONG_MAX,
		.for_reclaim = 0,
	};

151
	if (unlikely(f2fs_readonly(inode->i_sb)))
152 153
		return 0;

154
	trace_f2fs_sync_file_enter(inode);
155 156

	/* if fdatasync is triggered, let's do in-place-update */
157
	if (get_dirty_pages(inode) <= SM_I(sbi)->min_fsync_blocks)
158
		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
	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
	/*
	 * if there is no written data, don't waste time to write recovery info.
	 */
	if (!is_inode_flag_set(fi, FI_APPEND_WRITE) &&
171
			!exist_written_data(sbi, ino, APPEND_INO)) {
172 173 174 175 176 177 178 179 180
		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);

181
		if (is_inode_flag_set(fi, FI_UPDATE_WRITE) ||
182
				exist_written_data(sbi, ino, UPDATE_INO))
183 184 185
			goto flush_out;
		goto out;
	}
186
go_write:
187 188 189
	/* guarantee free sections for fsync */
	f2fs_balance_fs(sbi);

190 191 192 193
	/*
	 * Both of fdatasync() and fsync() are able to be recovered from
	 * sudden-power-off.
	 */
194 195
	down_read(&fi->i_sem);
	need_cp = need_do_checkpoint(inode);
196 197
	up_read(&fi->i_sem);

Jaegeuk Kim's avatar
Jaegeuk Kim committed
198
	if (need_cp) {
199 200
		nid_t pino;

Jaegeuk Kim's avatar
Jaegeuk Kim committed
201 202
		/* all the dirty node pages should be flushed for POR */
		ret = f2fs_sync_fs(inode->i_sb, 1);
203 204 205

		down_write(&fi->i_sem);
		F2FS_I(inode)->xattr_ver = 0;
206 207 208 209
		if (file_wrong_pino(inode) && inode->i_nlink == 1 &&
					get_parent_ino(inode, &pino)) {
			F2FS_I(inode)->i_pino = pino;
			file_got_pino(inode);
210
			up_write(&fi->i_sem);
211 212 213 214
			mark_inode_dirty_sync(inode);
			ret = f2fs_write_inode(inode, NULL);
			if (ret)
				goto out;
215 216
		} else {
			up_write(&fi->i_sem);
217
		}
Jaegeuk Kim's avatar
Jaegeuk Kim committed
218
	} else {
219 220 221 222
sync_nodes:
		sync_node_pages(sbi, ino, &wbc);

		if (need_inode_block_update(sbi, ino)) {
223
			mark_inode_dirty_sync(inode);
224 225 226
			ret = f2fs_write_inode(inode, NULL);
			if (ret)
				goto out;
227
			goto sync_nodes;
228
		}
229

230
		ret = wait_on_node_pages_writeback(sbi, ino);
231 232
		if (ret)
			goto out;
233 234

		/* once recovery info is written, don't need to tack this */
235
		remove_dirty_inode(sbi, ino, APPEND_INO);
236 237
		clear_inode_flag(fi, FI_APPEND_WRITE);
flush_out:
238
		remove_dirty_inode(sbi, ino, UPDATE_INO);
239
		clear_inode_flag(fi, FI_UPDATE_WRITE);
240
		ret = f2fs_issue_flush(F2FS_I_SB(inode));
Jaegeuk Kim's avatar
Jaegeuk Kim committed
241 242
	}
out:
243
	trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
244 245 246
	return ret;
}

247 248 249 250 251 252 253 254 255 256 257
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
258 259 260
	nr_pages = pagevec_lookup_tag(&pvec, mapping, &pgofs,
					PAGECACHE_TAG_DIRTY, 1);
	pgofs = nr_pages ? pvec.pages[0]->index : LONG_MAX;
261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281
	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;
}

282 283 284 285 286
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;
287 288 289
	pgoff_t pgofs, end_offset, dirty;
	loff_t data_ofs = offset;
	loff_t isize;
290 291 292 293 294 295 296 297 298
	int err = 0;

	mutex_lock(&inode->i_mutex);

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

	/* handle inline data case */
Chao Yu's avatar
Chao Yu committed
299
	if (f2fs_has_inline_data(inode) || f2fs_has_inline_dentry(inode)) {
300 301 302 303 304 305 306
		if (whence == SEEK_HOLE)
			data_ofs = isize;
		goto found;
	}

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

307 308
	dirty = __get_first_dirty_index(inode->i_mapping, pgofs, whence);

309 310 311 312 313 314
	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
315
			/* direct node does not exists */
316 317 318 319 320 321 322 323 324
			if (whence == SEEK_DATA) {
				pgofs = PGOFS_OF_NEXT_DNODE(pgofs,
							F2FS_I(inode));
				continue;
			} else {
				goto found;
			}
		}

325
		end_offset = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode));
326 327 328 329 330 331 332 333

		/* 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);

334
			if (__found_offset(blkaddr, dirty, pgofs, whence)) {
335 336 337 338 339 340 341 342 343 344
				f2fs_put_dnode(&dn);
				goto found;
			}
		}
		f2fs_put_dnode(&dn);
	}

	if (whence == SEEK_DATA)
		goto fail;
found:
345 346
	if (whence == SEEK_HOLE && data_ofs > isize)
		data_ofs = isize;
347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366
	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:
367 368
		if (offset < 0)
			return -ENXIO;
369 370 371 372 373 374
		return f2fs_seek_block(file, offset, whence);
	}

	return -EINVAL;
}

Jaegeuk Kim's avatar
Jaegeuk Kim committed
375 376
static int f2fs_file_mmap(struct file *file, struct vm_area_struct *vma)
{
377 378 379 380 381 382 383 384 385
	struct inode *inode = file_inode(file);

	/* we don't need to use inline_data strictly */
	if (f2fs_has_inline_data(inode)) {
		int err = f2fs_convert_inline_inode(inode);
		if (err)
			return err;
	}

Jaegeuk Kim's avatar
Jaegeuk Kim committed
386 387 388 389 390
	file_accessed(file);
	vma->vm_ops = &f2fs_file_vm_ops;
	return 0;
}

391
int truncate_data_blocks_range(struct dnode_of_data *dn, int count)
Jaegeuk Kim's avatar
Jaegeuk Kim committed
392 393
{
	int nr_free = 0, ofs = dn->ofs_in_node;
394
	struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
395 396 397
	struct f2fs_node *raw_node;
	__le32 *addr;

398
	raw_node = F2FS_NODE(dn->node_page);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
399 400
	addr = blkaddr_in_node(raw_node) + ofs;

Chris Fries's avatar
Chris Fries committed
401
	for (; count > 0; count--, addr++, dn->ofs_in_node++) {
Jaegeuk Kim's avatar
Jaegeuk Kim committed
402 403 404 405 406 407 408 409 410
		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) {
411
		dec_valid_block_count(sbi, dn->inode, nr_free);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
412 413 414 415
		set_page_dirty(dn->node_page);
		sync_inode_page(dn);
	}
	dn->ofs_in_node = ofs;
416 417 418

	trace_f2fs_truncate_data_blocks_range(dn->inode, dn->nid,
					 dn->ofs_in_node, nr_free);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
419 420 421 422 423 424 425 426
	return nr_free;
}

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

427
static int truncate_partial_data_page(struct inode *inode, u64 from)
Jaegeuk Kim's avatar
Jaegeuk Kim committed
428 429 430 431 432
{
	unsigned offset = from & (PAGE_CACHE_SIZE - 1);
	struct page *page;

	if (!offset)
433
		return 0;
Jaegeuk Kim's avatar
Jaegeuk Kim committed
434

435
	page = find_data_page(inode, from >> PAGE_CACHE_SHIFT, false);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
436
	if (IS_ERR(page))
437
		return 0;
Jaegeuk Kim's avatar
Jaegeuk Kim committed
438 439

	lock_page(page);
440 441 442 443
	if (unlikely(!PageUptodate(page) ||
			page->mapping != inode->i_mapping))
		goto out;

444
	f2fs_wait_on_page_writeback(page, DATA);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
445 446
	zero_user(page, offset, PAGE_CACHE_SIZE - offset);
	set_page_dirty(page);
447
out:
Jaegeuk Kim's avatar
Jaegeuk Kim committed
448
	f2fs_put_page(page, 1);
449
	return 0;
Jaegeuk Kim's avatar
Jaegeuk Kim committed
450 451
}

452
int truncate_blocks(struct inode *inode, u64 from, bool lock)
Jaegeuk Kim's avatar
Jaegeuk Kim committed
453
{
454
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
455 456 457
	unsigned int blocksize = inode->i_sb->s_blocksize;
	struct dnode_of_data dn;
	pgoff_t free_from;
458
	int count = 0, err = 0;
459
	struct page *ipage;
Jaegeuk Kim's avatar
Jaegeuk Kim committed
460

461 462
	trace_f2fs_truncate_blocks_enter(inode, from);

Jaegeuk Kim's avatar
Jaegeuk Kim committed
463
	free_from = (pgoff_t)
464
		((from + blocksize - 1) >> (sbi->log_blocksize));
Jaegeuk Kim's avatar
Jaegeuk Kim committed
465

466 467
	if (lock)
		f2fs_lock_op(sbi);
468

469 470 471 472 473 474 475 476 477 478 479 480 481 482
	ipage = get_node_page(sbi, inode->i_ino);
	if (IS_ERR(ipage)) {
		err = PTR_ERR(ipage);
		goto out;
	}

	if (f2fs_has_inline_data(inode)) {
		truncate_inline_data(ipage, from);
		update_inode(inode, ipage);
		f2fs_put_page(ipage, 1);
		goto out;
	}

	set_new_dnode(&dn, inode, ipage, NULL, 0);
483
	err = get_dnode_of_data(&dn, free_from, LOOKUP_NODE);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
484 485 486
	if (err) {
		if (err == -ENOENT)
			goto free_next;
487
		goto out;
488 489
	}

490
	count = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode));
Jaegeuk Kim's avatar
Jaegeuk Kim committed
491 492

	count -= dn.ofs_in_node;
493
	f2fs_bug_on(sbi, count < 0);
494

Jaegeuk Kim's avatar
Jaegeuk Kim committed
495 496 497 498 499 500 501 502
	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);
503 504 505 506 507

	/* lastly zero out the first data page */
	if (!err)
		err = truncate_partial_data_page(inode, from);
out:
508 509
	if (lock)
		f2fs_unlock_op(sbi);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
510

511
	trace_f2fs_truncate_blocks_exit(inode, err);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
512 513 514 515 516 517 518 519 520
	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;

521 522
	trace_f2fs_truncate(inode);

523
	if (!truncate_blocks(inode, i_size_read(inode), true)) {
Jaegeuk Kim's avatar
Jaegeuk Kim committed
524 525 526 527 528
		inode->i_mtime = inode->i_ctime = CURRENT_TIME;
		mark_inode_dirty(inode);
	}
}

529
int f2fs_getattr(struct vfsmount *mnt,
Jaegeuk Kim's avatar
Jaegeuk Kim committed
530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578
			 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;

579 580 581 582 583 584 585 586 587 588 589 590
	if (attr->ia_valid & ATTR_SIZE) {
		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
591 592 593 594 595
	}

	__setattr_copy(inode, attr);

	if (attr->ia_valid & ATTR_MODE) {
596
		err = posix_acl_chmod(inode, get_inode_mode(inode));
Jaegeuk Kim's avatar
Jaegeuk Kim committed
597 598 599 600 601 602 603 604 605 606 607 608 609 610
		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,
611
	.set_acl	= f2fs_set_acl,
Jaegeuk Kim's avatar
Jaegeuk Kim committed
612 613 614 615 616 617
#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
618
	.fiemap		= f2fs_fiemap,
Jaegeuk Kim's avatar
Jaegeuk Kim committed
619 620 621 622 623
};

static void fill_zero(struct inode *inode, pgoff_t index,
					loff_t start, loff_t len)
{
624
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
625 626 627 628 629
	struct page *page;

	if (!len)
		return;

630 631
	f2fs_balance_fs(sbi);

632
	f2fs_lock_op(sbi);
633
	page = get_new_data_page(inode, NULL, index, false);
634
	f2fs_unlock_op(sbi);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
635 636

	if (!IS_ERR(page)) {
637
		f2fs_wait_on_page_writeback(page, DATA);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
638 639 640 641 642 643 644 645 646 647 648 649 650
		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;
651

Jaegeuk Kim's avatar
Jaegeuk Kim committed
652
		set_new_dnode(&dn, inode, NULL, NULL, 0);
653
		err = get_dnode_of_data(&dn, index, LOOKUP_NODE);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
654 655 656 657 658 659 660 661 662 663 664 665 666
		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;
}

667
static int punch_hole(struct inode *inode, loff_t offset, loff_t len)
Jaegeuk Kim's avatar
Jaegeuk Kim committed
668 669 670 671 672
{
	pgoff_t pg_start, pg_end;
	loff_t off_start, off_end;
	int ret = 0;

673 674 675 676 677 678 679
	if (!S_ISREG(inode->i_mode))
		return -EOPNOTSUPP;

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

680 681 682 683 684
	if (f2fs_has_inline_data(inode)) {
		ret = f2fs_convert_inline_inode(inode);
		if (ret)
			return ret;
	}
685

Jaegeuk Kim's avatar
Jaegeuk Kim committed
686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704
	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;
705
			struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
706 707

			f2fs_balance_fs(sbi);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
708 709 710 711 712

			blk_start = pg_start << PAGE_CACHE_SHIFT;
			blk_end = pg_end << PAGE_CACHE_SHIFT;
			truncate_inode_pages_range(mapping, blk_start,
					blk_end - 1);
713

714
			f2fs_lock_op(sbi);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
715
			ret = truncate_hole(inode, pg_start, pg_end);
716
			f2fs_unlock_op(sbi);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
717 718 719 720 721 722 723 724 725
		}
	}

	return ret;
}

static int expand_inode_data(struct inode *inode, loff_t offset,
					loff_t len, int mode)
{
726
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
727 728 729 730 731
	pgoff_t index, pg_start, pg_end;
	loff_t new_size = i_size_read(inode);
	loff_t off_start, off_end;
	int ret = 0;

732 733
	f2fs_balance_fs(sbi);

Jaegeuk Kim's avatar
Jaegeuk Kim committed
734 735 736 737
	ret = inode_newsize_ok(inode, (len + offset));
	if (ret)
		return ret;

738 739 740 741 742
	if (f2fs_has_inline_data(inode)) {
		ret = f2fs_convert_inline_inode(inode);
		if (ret)
			return ret;
	}
743

Jaegeuk Kim's avatar
Jaegeuk Kim committed
744 745 746 747 748 749
	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);

750 751
	f2fs_lock_op(sbi);

Jaegeuk Kim's avatar
Jaegeuk Kim committed
752 753 754
	for (index = pg_start; index <= pg_end; index++) {
		struct dnode_of_data dn;

755 756 757
		if (index == pg_end && !off_end)
			goto noalloc;

Jaegeuk Kim's avatar
Jaegeuk Kim committed
758
		set_new_dnode(&dn, inode, NULL, NULL, 0);
759 760
		ret = f2fs_reserve_block(&dn, index);
		if (ret)
Jaegeuk Kim's avatar
Jaegeuk Kim committed
761
			break;
762
noalloc:
Jaegeuk Kim's avatar
Jaegeuk Kim committed
763 764 765 766 767 768 769 770 771 772 773 774 775 776
		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);
777
		update_inode_page(inode);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
778
	}
779
	f2fs_unlock_op(sbi);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
780 781 782 783 784 785 786

	return ret;
}

static long f2fs_fallocate(struct file *file, int mode,
				loff_t offset, loff_t len)
{
787
	struct inode *inode = file_inode(file);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
788 789 790 791 792
	long ret;

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

793 794
	mutex_lock(&inode->i_mutex);

Jaegeuk Kim's avatar
Jaegeuk Kim committed
795
	if (mode & FALLOC_FL_PUNCH_HOLE)
796
		ret = punch_hole(inode, offset, len);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
797 798 799
	else
		ret = expand_inode_data(inode, offset, len, mode);

800 801 802 803
	if (!ret) {
		inode->i_mtime = inode->i_ctime = CURRENT_TIME;
		mark_inode_dirty(inode);
	}
804 805 806

	mutex_unlock(&inode->i_mutex);

807
	trace_f2fs_fallocate(inode, mode, offset, len, ret);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823
	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;
}

824
static int f2fs_ioc_getflags(struct file *filp, unsigned long arg)
Jaegeuk Kim's avatar
Jaegeuk Kim committed
825
{
826
	struct inode *inode = file_inode(filp);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
827
	struct f2fs_inode_info *fi = F2FS_I(inode);
828 829 830
	unsigned int flags = fi->i_flags & FS_FL_USER_VISIBLE;
	return put_user(flags, (int __user *)arg);
}
Jaegeuk Kim's avatar
Jaegeuk Kim committed
831

832 833 834 835 836 837 838
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
839

840 841 842
	ret = mnt_want_write_file(filp);
	if (ret)
		return ret;
Jaegeuk Kim's avatar
Jaegeuk Kim committed
843

844 845 846 847
	if (!inode_owner_or_capable(inode)) {
		ret = -EACCES;
		goto out;
	}
Jaegeuk Kim's avatar
Jaegeuk Kim committed
848

849 850 851 852
	if (get_user(flags, (int __user *)arg)) {
		ret = -EFAULT;
		goto out;
	}
Jaegeuk Kim's avatar
Jaegeuk Kim committed
853

854
	flags = f2fs_mask_flags(inode->i_mode, flags);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
855

856
	mutex_lock(&inode->i_mutex);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
857

858
	oldflags = fi->i_flags;
Jaegeuk Kim's avatar
Jaegeuk Kim committed
859

860 861 862 863 864
	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
865
		}
866
	}
Jaegeuk Kim's avatar
Jaegeuk Kim committed
867

868 869 870 871
	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
872

873 874 875
	f2fs_set_inode_flags(inode);
	inode->i_ctime = CURRENT_TIME;
	mark_inode_dirty(inode);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
876
out:
877 878 879
	mnt_drop_write_file(filp);
	return ret;
}
880

Jaegeuk Kim's avatar
Jaegeuk Kim committed
881 882 883 884 885 886 887 888 889 890 891 892
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);

893
	return f2fs_convert_inline_inode(inode);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
894 895 896 897 898 899 900 901 902 903
}

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;

904 905 906
	if (f2fs_is_volatile_file(inode))
		return 0;

Jaegeuk Kim's avatar
Jaegeuk Kim committed
907 908 909 910 911 912 913 914 915 916 917 918
	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;
}

919 920 921 922 923 924 925 926
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);
927 928

	return f2fs_convert_inline_inode(inode);
929 930
}

931 932 933 934 935 936 937
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;
938

939 940
	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;
941

942 943
	if (!blk_queue_discard(q))
		return -EOPNOTSUPP;
944

945 946 947
	if (copy_from_user(&range, (struct fstrim_range __user *)arg,
				sizeof(range)))
		return -EFAULT;
948

949 950 951 952 953
	range.minlen = max((unsigned int)range.minlen,
				q->limits.discard_granularity);
	ret = f2fs_trim_fs(F2FS_SB(sb), &range);
	if (ret < 0)
		return ret;
954

955 956 957 958 959 960 961 962 963 964 965 966 967
	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
968 969 970 971
	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);
972 973
	case F2FS_IOC_START_VOLATILE_WRITE:
		return f2fs_ioc_start_volatile_write(filp);
974 975
	case FITRIM:
		return f2fs_ioc_fitrim(filp, arg);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
976 977 978 979 980
	default:
		return -ENOTTY;
	}
}

981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997
#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
998
const struct file_operations f2fs_file_operations = {
999
	.llseek		= f2fs_llseek,
1000
	.read		= new_sync_read,
1001
	.write		= new_sync_write,
1002
	.read_iter	= generic_file_read_iter,
1003
	.write_iter	= generic_file_write_iter,
Jaegeuk Kim's avatar
Jaegeuk Kim committed
1004 1005 1006 1007 1008
	.open		= generic_file_open,
	.mmap		= f2fs_file_mmap,
	.fsync		= f2fs_sync_file,
	.fallocate	= f2fs_fallocate,
	.unlocked_ioctl	= f2fs_ioctl,
1009 1010 1011
#ifdef CONFIG_COMPAT
	.compat_ioctl	= f2fs_compat_ioctl,
#endif
Jaegeuk Kim's avatar
Jaegeuk Kim committed
1012
	.splice_read	= generic_file_splice_read,
Al Viro's avatar
Al Viro committed
1013
	.splice_write	= iter_file_splice_write,
Jaegeuk Kim's avatar
Jaegeuk Kim committed
1014
};