file.c 15.3 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 22 23 24 25 26 27
#include <linux/uaccess.h>
#include <linux/mount.h>

#include "f2fs.h"
#include "node.h"
#include "segment.h"
#include "xattr.h"
#include "acl.h"
28
#include <trace/events/f2fs.h>
Jaegeuk Kim's avatar
Jaegeuk Kim committed
29 30 31 32 33

static int f2fs_vm_page_mkwrite(struct vm_area_struct *vma,
						struct vm_fault *vmf)
{
	struct page *page = vmf->page;
34
	struct inode *inode = file_inode(vma->vm_file);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
35 36 37
	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
	block_t old_blk_addr;
	struct dnode_of_data dn;
38
	int err, ilock;
Jaegeuk Kim's avatar
Jaegeuk Kim committed
39 40 41 42 43 44

	f2fs_balance_fs(sbi);

	sb_start_pagefault(inode->i_sb);

	/* block allocation */
45
	ilock = mutex_lock_op(sbi);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
46
	set_new_dnode(&dn, inode, NULL, NULL, 0);
47
	err = get_dnode_of_data(&dn, page->index, ALLOC_NODE);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
48
	if (err) {
49
		mutex_unlock_op(sbi, ilock);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
50 51 52 53 54 55 56 57 58
		goto out;
	}

	old_blk_addr = dn.data_blkaddr;

	if (old_blk_addr == NULL_ADDR) {
		err = reserve_new_block(&dn);
		if (err) {
			f2fs_put_dnode(&dn);
59
			mutex_unlock_op(sbi, ilock);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
60 61 62 63
			goto out;
		}
	}
	f2fs_put_dnode(&dn);
64
	mutex_unlock_op(sbi, ilock);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
65

66
	file_update_time(vma->vm_file);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
67 68
	lock_page(page);
	if (page->mapping != inode->i_mapping ||
69
			page_offset(page) > i_size_read(inode) ||
Jaegeuk Kim's avatar
Jaegeuk Kim committed
70 71 72 73 74 75 76 77 78 79
			!PageUptodate(page)) {
		unlock_page(page);
		err = -EFAULT;
		goto out;
	}

	/*
	 * check to see if the page is mapped already (no holes)
	 */
	if (PageMappedToDisk(page))
80
		goto mapped;
Jaegeuk Kim's avatar
Jaegeuk Kim committed
81 82 83 84 85 86 87 88 89 90

	/* 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);

91 92 93
mapped:
	/* fill the page */
	wait_on_page_writeback(page);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
94 95 96 97 98 99
out:
	sb_end_pagefault(inode->i_sb);
	return block_page_mkwrite_return(err);
}

static const struct vm_operations_struct f2fs_file_vm_ops = {
100 101 102
	.fault		= filemap_fault,
	.page_mkwrite	= f2fs_vm_page_mkwrite,
	.remap_pages	= generic_file_remap_pages,
Jaegeuk Kim's avatar
Jaegeuk Kim committed
103 104 105 106 107 108 109 110 111 112 113 114 115 116
};

int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
{
	struct inode *inode = file->f_mapping->host;
	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
	int ret = 0;
	bool need_cp = false;
	struct writeback_control wbc = {
		.sync_mode = WB_SYNC_ALL,
		.nr_to_write = LONG_MAX,
		.for_reclaim = 0,
	};

Jaegeuk Kim's avatar
Jaegeuk Kim committed
117
	if (f2fs_readonly(inode->i_sb))
118 119
		return 0;

120
	trace_f2fs_sync_file_enter(inode);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
121
	ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
122 123
	if (ret) {
		trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
124
		return ret;
125
	}
Jaegeuk Kim's avatar
Jaegeuk Kim committed
126

127 128 129
	/* guarantee free sections for fsync */
	f2fs_balance_fs(sbi);

Jaegeuk Kim's avatar
Jaegeuk Kim committed
130 131 132 133 134 135 136
	mutex_lock(&inode->i_mutex);

	if (datasync && !(inode->i_state & I_DIRTY_DATASYNC))
		goto out;

	if (!S_ISREG(inode->i_mode) || inode->i_nlink != 1)
		need_cp = true;
137
	else if (is_cp_file(inode))
Jaegeuk Kim's avatar
Jaegeuk Kim committed
138
		need_cp = true;
139
	else if (!space_for_roll_forward(sbi))
Jaegeuk Kim's avatar
Jaegeuk Kim committed
140
		need_cp = true;
141
	else if (!is_checkpointed_node(sbi, F2FS_I(inode)->i_pino))
Jaegeuk Kim's avatar
Jaegeuk Kim committed
142 143 144 145 146 147
		need_cp = true;

	if (need_cp) {
		/* all the dirty node pages should be flushed for POR */
		ret = f2fs_sync_fs(inode->i_sb, 1);
	} else {
148 149 150 151 152 153
		/* if there is no written node page, write its inode page */
		while (!sync_node_pages(sbi, inode->i_ino, &wbc)) {
			ret = f2fs_write_inode(inode, NULL);
			if (ret)
				goto out;
		}
Jaegeuk Kim's avatar
Jaegeuk Kim committed
154 155
		filemap_fdatawait_range(sbi->node_inode->i_mapping,
							0, LONG_MAX);
156
		ret = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
157 158 159
	}
out:
	mutex_unlock(&inode->i_mutex);
160
	trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
161 162 163 164 165 166 167 168 169 170
	return ret;
}

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;
}

171
int truncate_data_blocks_range(struct dnode_of_data *dn, int count)
Jaegeuk Kim's avatar
Jaegeuk Kim committed
172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195
{
	int nr_free = 0, ofs = dn->ofs_in_node;
	struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
	struct f2fs_node *raw_node;
	__le32 *addr;

	raw_node = page_address(dn->node_page);
	addr = blkaddr_in_node(raw_node) + ofs;

	for ( ; count > 0; count--, addr++, dn->ofs_in_node++) {
		block_t blkaddr = le32_to_cpu(*addr);
		if (blkaddr == NULL_ADDR)
			continue;

		update_extent_cache(NULL_ADDR, dn);
		invalidate_blocks(sbi, blkaddr);
		dec_valid_block_count(sbi, dn->inode, 1);
		nr_free++;
	}
	if (nr_free) {
		set_page_dirty(dn->node_page);
		sync_inode_page(dn);
	}
	dn->ofs_in_node = ofs;
196 197 198

	trace_f2fs_truncate_data_blocks_range(dn->inode, dn->nid,
					 dn->ofs_in_node, nr_free);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214
	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;

	if (!offset)
		return;

215
	page = find_data_page(inode, from >> PAGE_CACHE_SHIFT, false);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
216 217 218 219
	if (IS_ERR(page))
		return;

	lock_page(page);
220 221 222 223
	if (page->mapping != inode->i_mapping) {
		f2fs_put_page(page, 1);
		return;
	}
Jaegeuk Kim's avatar
Jaegeuk Kim committed
224 225 226 227 228 229 230 231 232 233 234 235
	wait_on_page_writeback(page);
	zero_user(page, offset, PAGE_CACHE_SIZE - offset);
	set_page_dirty(page);
	f2fs_put_page(page, 1);
}

static int truncate_blocks(struct inode *inode, u64 from)
{
	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
	unsigned int blocksize = inode->i_sb->s_blocksize;
	struct dnode_of_data dn;
	pgoff_t free_from;
236
	int count = 0, ilock = -1;
Jaegeuk Kim's avatar
Jaegeuk Kim committed
237 238
	int err;

239 240
	trace_f2fs_truncate_blocks_enter(inode, from);

Jaegeuk Kim's avatar
Jaegeuk Kim committed
241 242 243
	free_from = (pgoff_t)
			((from + blocksize - 1) >> (sbi->log_blocksize));

244
	ilock = mutex_lock_op(sbi);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
245
	set_new_dnode(&dn, inode, NULL, NULL, 0);
246
	err = get_dnode_of_data(&dn, free_from, LOOKUP_NODE);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
247 248 249
	if (err) {
		if (err == -ENOENT)
			goto free_next;
250
		mutex_unlock_op(sbi, ilock);
251
		trace_f2fs_truncate_blocks_exit(inode, err);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
252 253 254 255 256 257 258 259 260 261
		return err;
	}

	if (IS_INODE(dn.node_page))
		count = ADDRS_PER_INODE;
	else
		count = ADDRS_PER_BLOCK;

	count -= dn.ofs_in_node;
	BUG_ON(count < 0);
262

Jaegeuk Kim's avatar
Jaegeuk Kim committed
263 264 265 266 267 268 269 270
	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);
271
	mutex_unlock_op(sbi, ilock);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
272 273 274 275

	/* lastly zero out the first data page */
	truncate_partial_data_page(inode, from);

276
	trace_f2fs_truncate_blocks_exit(inode, err);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
277 278 279 280 281 282 283 284 285
	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;

286 287
	trace_f2fs_truncate(inode);

Jaegeuk Kim's avatar
Jaegeuk Kim committed
288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347
	if (!truncate_blocks(inode, i_size_read(inode))) {
		inode->i_mtime = inode->i_ctime = CURRENT_TIME;
		mark_inode_dirty(inode);
	}
}

static int f2fs_getattr(struct vfsmount *mnt,
			 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)) {
		truncate_setsize(inode, attr->ia_size);
		f2fs_truncate(inode);
348
		f2fs_balance_fs(F2FS_SB(inode->i_sb));
Jaegeuk Kim's avatar
Jaegeuk Kim committed
349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379
	}

	__setattr_copy(inode, attr);

	if (attr->ia_valid & ATTR_MODE) {
		err = f2fs_acl_chmod(inode);
		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,
#ifdef CONFIG_F2FS_FS_XATTR
	.setxattr	= generic_setxattr,
	.getxattr	= generic_getxattr,
	.listxattr	= f2fs_listxattr,
	.removexattr	= generic_removexattr,
#endif
};

static void fill_zero(struct inode *inode, pgoff_t index,
					loff_t start, loff_t len)
{
380
	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
381
	struct page *page;
382
	int ilock;
Jaegeuk Kim's avatar
Jaegeuk Kim committed
383 384 385 386

	if (!len)
		return;

387 388
	f2fs_balance_fs(sbi);

389
	ilock = mutex_lock_op(sbi);
390
	page = get_new_data_page(inode, NULL, index, false);
391
	mutex_unlock_op(sbi, ilock);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407

	if (!IS_ERR(page)) {
		wait_on_page_writeback(page);
		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;
408

Jaegeuk Kim's avatar
Jaegeuk Kim committed
409
		set_new_dnode(&dn, inode, NULL, NULL, 0);
410
		err = get_dnode_of_data(&dn, index, LOOKUP_NODE);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448
		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;
}

static int punch_hole(struct inode *inode, loff_t offset, loff_t len, int mode)
{
	pgoff_t pg_start, pg_end;
	loff_t off_start, off_end;
	int ret = 0;

	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;
449
			struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
450
			int ilock;
451 452

			f2fs_balance_fs(sbi);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
453 454 455 456 457

			blk_start = pg_start << PAGE_CACHE_SHIFT;
			blk_end = pg_end << PAGE_CACHE_SHIFT;
			truncate_inode_pages_range(mapping, blk_start,
					blk_end - 1);
458 459

			ilock = mutex_lock_op(sbi);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
460
			ret = truncate_hole(inode, pg_start, pg_end);
461
			mutex_unlock_op(sbi, ilock);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494
		}
	}

	if (!(mode & FALLOC_FL_KEEP_SIZE) &&
		i_size_read(inode) <= (offset + len)) {
		i_size_write(inode, offset);
		mark_inode_dirty(inode);
	}

	return ret;
}

static int expand_inode_data(struct inode *inode, loff_t offset,
					loff_t len, int mode)
{
	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
	pgoff_t index, pg_start, pg_end;
	loff_t new_size = i_size_read(inode);
	loff_t off_start, off_end;
	int ret = 0;

	ret = inode_newsize_ok(inode, (len + offset));
	if (ret)
		return ret;

	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);

	for (index = pg_start; index <= pg_end; index++) {
		struct dnode_of_data dn;
495
		int ilock;
Jaegeuk Kim's avatar
Jaegeuk Kim committed
496

497
		ilock = mutex_lock_op(sbi);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
498
		set_new_dnode(&dn, inode, NULL, NULL, 0);
499
		ret = get_dnode_of_data(&dn, index, ALLOC_NODE);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
500
		if (ret) {
501
			mutex_unlock_op(sbi, ilock);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
502 503 504 505 506 507 508
			break;
		}

		if (dn.data_blkaddr == NULL_ADDR) {
			ret = reserve_new_block(&dn);
			if (ret) {
				f2fs_put_dnode(&dn);
509
				mutex_unlock_op(sbi, ilock);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
510 511 512 513
				break;
			}
		}
		f2fs_put_dnode(&dn);
514
		mutex_unlock_op(sbi, ilock);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537

		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);
	}

	return ret;
}

static long f2fs_fallocate(struct file *file, int mode,
				loff_t offset, loff_t len)
{
538
	struct inode *inode = file_inode(file);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
539 540 541 542 543 544 545 546 547 548
	long ret;

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

	if (mode & FALLOC_FL_PUNCH_HOLE)
		ret = punch_hole(inode, offset, len, mode);
	else
		ret = expand_inode_data(inode, offset, len, mode);

549 550 551 552
	if (!ret) {
		inode->i_mtime = inode->i_ctime = CURRENT_TIME;
		mark_inode_dirty(inode);
	}
553
	trace_f2fs_fallocate(inode, mode, offset, len, ret);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571
	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)
{
572
	struct inode *inode = file_inode(filp);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
573 574 575 576 577 578 579 580 581 582 583 584
	struct f2fs_inode_info *fi = F2FS_I(inode);
	unsigned int flags;
	int ret;

	switch (cmd) {
	case FS_IOC_GETFLAGS:
		flags = fi->i_flags & FS_FL_USER_VISIBLE;
		return put_user(flags, (int __user *) arg);
	case FS_IOC_SETFLAGS:
	{
		unsigned int oldflags;

585
		ret = mnt_want_write_file(filp);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621
		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:
622
		mnt_drop_write_file(filp);
Jaegeuk Kim's avatar
Jaegeuk Kim committed
623 624 625 626 627 628 629
		return ret;
	}
	default:
		return -ENOTTY;
	}
}

630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646
#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
647 648 649 650 651 652 653 654 655 656 657
const struct file_operations f2fs_file_operations = {
	.llseek		= generic_file_llseek,
	.read		= do_sync_read,
	.write		= do_sync_write,
	.aio_read	= generic_file_aio_read,
	.aio_write	= generic_file_aio_write,
	.open		= generic_file_open,
	.mmap		= f2fs_file_mmap,
	.fsync		= f2fs_sync_file,
	.fallocate	= f2fs_fallocate,
	.unlocked_ioctl	= f2fs_ioctl,
658 659 660
#ifdef CONFIG_COMPAT
	.compat_ioctl	= f2fs_compat_ioctl,
#endif
Jaegeuk Kim's avatar
Jaegeuk Kim committed
661 662 663
	.splice_read	= generic_file_splice_read,
	.splice_write	= generic_file_splice_write,
};