[linux-2.6-block.git] / fs / f2fs / file.c

/*
 * 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>
#include <linux/blkdev.h>
#include <linux/falloc.h>
#include <linux/types.h>
#include <linux/compat.h>
#include <linux/uaccess.h>
#include <linux/mount.h>

#include "f2fs.h"
#include "node.h"
#include "segment.h"
#include "xattr.h"
#include "acl.h"
#include <trace/events/f2fs.h>

static int f2fs_vm_page_mkwrite(struct vm_area_struct *vma,
						struct vm_fault *vmf)
{
	struct page *page = vmf->page;
	struct inode *inode = file_inode(vma->vm_file);
	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
	block_t old_blk_addr;
	struct dnode_of_data dn;
	int err, ilock;

	f2fs_balance_fs(sbi);

	sb_start_pagefault(inode->i_sb);

	/* block allocation */
	ilock = mutex_lock_op(sbi);
	set_new_dnode(&dn, inode, NULL, NULL, 0);
	err = get_dnode_of_data(&dn, page->index, ALLOC_NODE);
	if (err) {
		mutex_unlock_op(sbi, ilock);
		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);
			mutex_unlock_op(sbi, ilock);
			goto out;
		}
	}
	f2fs_put_dnode(&dn);
	mutex_unlock_op(sbi, ilock);

	file_update_time(vma->vm_file);
	lock_page(page);
	if (page->mapping != inode->i_mapping ||
			page_offset(page) > i_size_read(inode) ||
			!PageUptodate(page)) {
		unlock_page(page);
		err = -EFAULT;
		goto out;
	}

	/*
	 * check to see if the page is mapped already (no holes)
	 */
	if (PageMappedToDisk(page))
		goto mapped;

	/* 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);

mapped:
	/* fill the page */
	wait_on_page_writeback(page);
out:
	sb_end_pagefault(inode->i_sb);
	return block_page_mkwrite_return(err);
}

static const struct vm_operations_struct f2fs_file_vm_ops = {
	.fault		= filemap_fault,
	.page_mkwrite	= f2fs_vm_page_mkwrite,
	.remap_pages	= generic_file_remap_pages,
};

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;

	if (update_dent_inode(inode, &dentry->d_name)) {
		dput(dentry);
		return 0;
	}

	*pino = parent_ino(dentry);
	dput(dentry);
	return 1;
}

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,
	};

	if (f2fs_readonly(inode->i_sb))
		return 0;

	trace_f2fs_sync_file_enter(inode);
	ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
	if (ret) {
		trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
		return ret;
	}

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

	mutex_lock(&inode->i_mutex);

	/*
	 * Both of fdatasync() and fsync() are able to be recovered from
	 * sudden-power-off.
	 */
	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;

	if (need_cp) {
		nid_t pino;

		F2FS_I(inode)->xattr_ver = 0;

		/* all the dirty node pages should be flushed for POR */
		ret = f2fs_sync_fs(inode->i_sb, 1);
		if (file_wrong_pino(inode) && inode->i_nlink == 1 &&
					get_parent_ino(inode, &pino)) {
			F2FS_I(inode)->i_pino = pino;
			file_got_pino(inode);
			mark_inode_dirty_sync(inode);
			ret = f2fs_write_inode(inode, NULL);
			if (ret)
				goto out;
		}
	} else {
		/* if there is no written node page, write its inode page */
		while (!sync_node_pages(sbi, inode->i_ino, &wbc)) {
			mark_inode_dirty_sync(inode);
			ret = f2fs_write_inode(inode, NULL);
			if (ret)
				goto out;
		}
		filemap_fdatawait_range(sbi->node_inode->i_mapping,
							0, LONG_MAX);
		ret = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
	}
out:
	mutex_unlock(&inode->i_mutex);
	trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
	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;
}

int truncate_data_blocks_range(struct dnode_of_data *dn, int count)
{
	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 = F2FS_NODE(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);
		nr_free++;
	}
	if (nr_free) {
		dec_valid_block_count(sbi, dn->inode, nr_free);
		set_page_dirty(dn->node_page);
		sync_inode_page(dn);
	}
	dn->ofs_in_node = ofs;

	trace_f2fs_truncate_data_blocks_range(dn->inode, dn->nid,
					 dn->ofs_in_node, nr_free);
	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;

	page = find_data_page(inode, from >> PAGE_CACHE_SHIFT, false);
	if (IS_ERR(page))
		return;

	lock_page(page);
	if (page->mapping != inode->i_mapping) {
		f2fs_put_page(page, 1);
		return;
	}
	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;
	int count = 0, ilock = -1;
	int err;

	trace_f2fs_truncate_blocks_enter(inode, from);

	free_from = (pgoff_t)
			((from + blocksize - 1) >> (sbi->log_blocksize));

	ilock = mutex_lock_op(sbi);
	set_new_dnode(&dn, inode, NULL, NULL, 0);
	err = get_dnode_of_data(&dn, free_from, LOOKUP_NODE);
	if (err) {
		if (err == -ENOENT)
			goto free_next;
		mutex_unlock_op(sbi, ilock);
		trace_f2fs_truncate_blocks_exit(inode, err);
		return err;
	}

	if (IS_INODE(dn.node_page))
		count = ADDRS_PER_INODE(F2FS_I(inode));
	else
		count = ADDRS_PER_BLOCK;

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

	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);
	mutex_unlock_op(sbi, ilock);

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

	trace_f2fs_truncate_blocks_exit(inode, err);
	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;

	trace_f2fs_truncate(inode);

	if (!truncate_blocks(inode, i_size_read(inode))) {
		inode->i_mtime = inode->i_ctime = CURRENT_TIME;
		mark_inode_dirty(inode);
	}
}

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);
		f2fs_balance_fs(F2FS_SB(inode->i_sb));
	}

	__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)
{
	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
	struct page *page;
	int ilock;

	if (!len)
		return;

	f2fs_balance_fs(sbi);

	ilock = mutex_lock_op(sbi);
	page = get_new_data_page(inode, NULL, index, false);
	mutex_unlock_op(sbi, ilock);

	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;

		set_new_dnode(&dn, inode, NULL, NULL, 0);
		err = get_dnode_of_data(&dn, index, LOOKUP_NODE);
		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;
			struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
			int ilock;

			f2fs_balance_fs(sbi);

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

			ilock = mutex_lock_op(sbi);
			ret = truncate_hole(inode, pg_start, pg_end);
			mutex_unlock_op(sbi, ilock);
		}
	}

	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;
		int ilock;

		ilock = mutex_lock_op(sbi);
		set_new_dnode(&dn, inode, NULL, NULL, 0);
		ret = get_dnode_of_data(&dn, index, ALLOC_NODE);
		if (ret) {
			mutex_unlock_op(sbi, ilock);
			break;
		}

		if (dn.data_blkaddr == NULL_ADDR) {
			ret = reserve_new_block(&dn);
			if (ret) {
				f2fs_put_dnode(&dn);
				mutex_unlock_op(sbi, ilock);
				break;
			}
		}
		f2fs_put_dnode(&dn);
		mutex_unlock_op(sbi, ilock);

		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)
{
	struct inode *inode = file_inode(file);
	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);

	if (!ret) {
		inode->i_mtime = inode->i_ctime = CURRENT_TIME;
		mark_inode_dirty(inode);
	}
	trace_f2fs_fallocate(inode, mode, offset, len, ret);
	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)
{
	struct inode *inode = file_inode(filp);
	struct f2fs_inode_info *fi = F2FS_I(inode);
	unsigned int flags;
	int ret;

	switch (cmd) {
	case F2FS_IOC_GETFLAGS:
		flags = fi->i_flags & FS_FL_USER_VISIBLE;
		return put_user(flags, (int __user *) arg);
	case F2FS_IOC_SETFLAGS:
	{
		unsigned int oldflags;

		ret = mnt_want_write_file(filp);
		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:
		mnt_drop_write_file(filp);
		return ret;
	}
	default:
		return -ENOTTY;
	}
}

#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

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,
#ifdef CONFIG_COMPAT
	.compat_ioctl	= f2fs_compat_ioctl,
#endif
	.splice_read	= generic_file_splice_read,
	.splice_write	= generic_file_splice_write,
};
Commit	Line	Data
0a8165d7	1	/*
fbfa2cc5 JK	2	* fs/f2fs/file.c
	3	*
	4	* Copyright (c) 2012 Samsung Electronics Co., Ltd.
	5	* http://www.samsung.com/
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11	#include <linux/fs.h>
	12	#include <linux/f2fs_fs.h>
	13	#include <linux/stat.h>
	14	#include <linux/buffer_head.h>
	15	#include <linux/writeback.h>
ae51fb31	16	#include <linux/blkdev.h>
fbfa2cc5 JK	17	#include <linux/falloc.h>
fbfa2cc5 JK	18	#include <linux/types.h>
e9750824	19	#include <linux/compat.h>
fbfa2cc5 JK	20	#include <linux/uaccess.h>
	21	#include <linux/mount.h>
	22
	23	#include "f2fs.h"
	24	#include "node.h"
	25	#include "segment.h"
	26	#include "xattr.h"
	27	#include "acl.h"
a2a4a7e4	28	#include <trace/events/f2fs.h>
fbfa2cc5 JK	29
	30	static int f2fs_vm_page_mkwrite(struct vm_area_struct *vma,
	31	struct vm_fault *vmf)
	32	{
	33	struct page *page = vmf->page;
6131ffaa	34	struct inode *inode = file_inode(vma->vm_file);
fbfa2cc5	35	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
fbfa2cc5 JK	36	block_t old_blk_addr;
fbfa2cc5 JK	37	struct dnode_of_data dn;
39936837	38	int err, ilock;
fbfa2cc5 JK	39
	40	f2fs_balance_fs(sbi);
	41
	42	sb_start_pagefault(inode->i_sb);
	43
fbfa2cc5	44	/* block allocation */
39936837	45	ilock = mutex_lock_op(sbi);
fbfa2cc5	46	set_new_dnode(&dn, inode, NULL, NULL, 0);
266e97a8	47	err = get_dnode_of_data(&dn, page->index, ALLOC_NODE);
fbfa2cc5	48	if (err) {
39936837	49	mutex_unlock_op(sbi, ilock);
fbfa2cc5 JK	50	goto out;
	51	}
	52
	53	old_blk_addr = dn.data_blkaddr;
fbfa2cc5 JK	54
	55	if (old_blk_addr == NULL_ADDR) {
	56	err = reserve_new_block(&dn);
	57	if (err) {
	58	f2fs_put_dnode(&dn);
39936837	59	mutex_unlock_op(sbi, ilock);
fbfa2cc5 JK	60	goto out;
	61	}
	62	}
	63	f2fs_put_dnode(&dn);
39936837	64	mutex_unlock_op(sbi, ilock);
fbfa2cc5	65
9851e6e1	66	file_update_time(vma->vm_file);
fbfa2cc5 JK	67	lock_page(page);
fbfa2cc5 JK	68	if (page->mapping != inode->i_mapping \|\|
9851e6e1	69	page_offset(page) > i_size_read(inode) \|\|
fbfa2cc5 JK	70	!PageUptodate(page)) {
	71	unlock_page(page);
	72	err = -EFAULT;
	73	goto out;
	74	}
	75
	76	/*
	77	* check to see if the page is mapped already (no holes)
	78	*/
	79	if (PageMappedToDisk(page))
9851e6e1	80	goto mapped;
fbfa2cc5 JK	81
	82	/* page is wholly or partially inside EOF */
	83	if (((page->index + 1) << PAGE_CACHE_SHIFT) > i_size_read(inode)) {
	84	unsigned offset;
	85	offset = i_size_read(inode) & ~PAGE_CACHE_MASK;
	86	zero_user_segment(page, offset, PAGE_CACHE_SIZE);
	87	}
	88	set_page_dirty(page);
	89	SetPageUptodate(page);
	90
9851e6e1 NJ	91	mapped:
	92	/* fill the page */
	93	wait_on_page_writeback(page);
fbfa2cc5 JK	94	out:
	95	sb_end_pagefault(inode->i_sb);
	96	return block_page_mkwrite_return(err);
	97	}
	98
	99	static const struct vm_operations_struct f2fs_file_vm_ops = {
692bb55d JK	100	.fault = filemap_fault,
	101	.page_mkwrite = f2fs_vm_page_mkwrite,
	102	.remap_pages = generic_file_remap_pages,
fbfa2cc5 JK	103	};
fbfa2cc5 JK	104
354a3399 JK	105	static int get_parent_ino(struct inode inode, nid_t pino)
	106	{
	107	struct dentry *dentry;
	108
	109	inode = igrab(inode);
	110	dentry = d_find_any_alias(inode);
	111	iput(inode);
	112	if (!dentry)
	113	return 0;
	114
f0947e5c JK	115	if (update_dent_inode(inode, &dentry->d_name)) {
	116	dput(dentry);
	117	return 0;
	118	}
354a3399	119
f0947e5c JK	120	*pino = parent_ino(dentry);
f0947e5c JK	121	dput(dentry);
354a3399 JK	122	return 1;
	123	}
	124
fbfa2cc5 JK	125	int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
	126	{
	127	struct inode *inode = file->f_mapping->host;
	128	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
fbfa2cc5 JK	129	int ret = 0;
	130	bool need_cp = false;
	131	struct writeback_control wbc = {
	132	.sync_mode = WB_SYNC_ALL,
	133	.nr_to_write = LONG_MAX,
	134	.for_reclaim = 0,
	135	};
	136
77888c1e	137	if (f2fs_readonly(inode->i_sb))
1fa95b0b NJ	138	return 0;
1fa95b0b NJ	139
a2a4a7e4	140	trace_f2fs_sync_file_enter(inode);
fbfa2cc5	141	ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
a2a4a7e4 NJ	142	if (ret) {
a2a4a7e4 NJ	143	trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
fbfa2cc5	144	return ret;
a2a4a7e4	145	}
fbfa2cc5	146
7d82db83 JK	147	/* guarantee free sections for fsync */
	148	f2fs_balance_fs(sbi);
	149
fbfa2cc5 JK	150	mutex_lock(&inode->i_mutex);
fbfa2cc5 JK	151
e5d2385e JK	152	/*
	153	* Both of fdatasync() and fsync() are able to be recovered from
	154	* sudden-power-off.
	155	*/
fbfa2cc5 JK	156	if (!S_ISREG(inode->i_mode) \|\| inode->i_nlink != 1)
fbfa2cc5 JK	157	need_cp = true;
354a3399	158	else if (file_wrong_pino(inode))
fbfa2cc5	159	need_cp = true;
facb0205	160	else if (!space_for_roll_forward(sbi))
fbfa2cc5	161	need_cp = true;
953a3e27	162	else if (!is_checkpointed_node(sbi, F2FS_I(inode)->i_pino))
fbfa2cc5	163	need_cp = true;
d71b5564	164	else if (F2FS_I(inode)->xattr_ver == cur_cp_version(F2FS_CKPT(sbi)))
e518ff81	165	need_cp = true;
fbfa2cc5	166
fbfa2cc5	167	if (need_cp) {
354a3399 JK	168	nid_t pino;
354a3399 JK	169
e518ff81 JK	170	F2FS_I(inode)->xattr_ver = 0;
e518ff81 JK	171
fbfa2cc5 JK	172	/* all the dirty node pages should be flushed for POR */
fbfa2cc5 JK	173	ret = f2fs_sync_fs(inode->i_sb, 1);
354a3399 JK	174	if (file_wrong_pino(inode) && inode->i_nlink == 1 &&
	175	get_parent_ino(inode, &pino)) {
	176	F2FS_I(inode)->i_pino = pino;
	177	file_got_pino(inode);
	178	mark_inode_dirty_sync(inode);
	179	ret = f2fs_write_inode(inode, NULL);
	180	if (ret)
	181	goto out;
	182	}
fbfa2cc5	183	} else {
398b1ac5 JK	184	/* if there is no written node page, write its inode page */
398b1ac5 JK	185	while (!sync_node_pages(sbi, inode->i_ino, &wbc)) {
b3783873	186	mark_inode_dirty_sync(inode);
398b1ac5 JK	187	ret = f2fs_write_inode(inode, NULL);
	188	if (ret)
	189	goto out;
	190	}
fbfa2cc5 JK	191	filemap_fdatawait_range(sbi->node_inode->i_mapping,
fbfa2cc5 JK	192	0, LONG_MAX);
ae51fb31	193	ret = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
fbfa2cc5 JK	194	}
	195	out:
	196	mutex_unlock(&inode->i_mutex);
a2a4a7e4	197	trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
fbfa2cc5 JK	198	return ret;
	199	}
	200
	201	static int f2fs_file_mmap(struct file file, struct vm_area_struct vma)
	202	{
	203	file_accessed(file);
	204	vma->vm_ops = &f2fs_file_vm_ops;
	205	return 0;
	206	}
	207
b292dcab	208	int truncate_data_blocks_range(struct dnode_of_data *dn, int count)
fbfa2cc5 JK	209	{
	210	int nr_free = 0, ofs = dn->ofs_in_node;
	211	struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
	212	struct f2fs_node *raw_node;
	213	__le32 *addr;
	214
45590710	215	raw_node = F2FS_NODE(dn->node_page);
fbfa2cc5 JK	216	addr = blkaddr_in_node(raw_node) + ofs;
	217
	218	for ( ; count > 0; count--, addr++, dn->ofs_in_node++) {
	219	block_t blkaddr = le32_to_cpu(*addr);
	220	if (blkaddr == NULL_ADDR)
	221	continue;
	222
	223	update_extent_cache(NULL_ADDR, dn);
	224	invalidate_blocks(sbi, blkaddr);
fbfa2cc5 JK	225	nr_free++;
	226	}
	227	if (nr_free) {
d7cc950b	228	dec_valid_block_count(sbi, dn->inode, nr_free);
fbfa2cc5 JK	229	set_page_dirty(dn->node_page);
	230	sync_inode_page(dn);
	231	}
	232	dn->ofs_in_node = ofs;
51dd6249 NJ	233
	234	trace_f2fs_truncate_data_blocks_range(dn->inode, dn->nid,
	235	dn->ofs_in_node, nr_free);
fbfa2cc5 JK	236	return nr_free;
	237	}
	238
	239	void truncate_data_blocks(struct dnode_of_data *dn)
	240	{
	241	truncate_data_blocks_range(dn, ADDRS_PER_BLOCK);
	242	}
	243
	244	static void truncate_partial_data_page(struct inode *inode, u64 from)
	245	{
	246	unsigned offset = from & (PAGE_CACHE_SIZE - 1);
	247	struct page *page;
	248
	249	if (!offset)
	250	return;
	251
c718379b	252	page = find_data_page(inode, from >> PAGE_CACHE_SHIFT, false);
fbfa2cc5 JK	253	if (IS_ERR(page))
	254	return;
	255
	256	lock_page(page);
afcb7ca0 JK	257	if (page->mapping != inode->i_mapping) {
	258	f2fs_put_page(page, 1);
	259	return;
	260	}
fbfa2cc5 JK	261	wait_on_page_writeback(page);
	262	zero_user(page, offset, PAGE_CACHE_SIZE - offset);
	263	set_page_dirty(page);
	264	f2fs_put_page(page, 1);
	265	}
	266
	267	static int truncate_blocks(struct inode *inode, u64 from)
	268	{
	269	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
	270	unsigned int blocksize = inode->i_sb->s_blocksize;
	271	struct dnode_of_data dn;
	272	pgoff_t free_from;
39936837	273	int count = 0, ilock = -1;
fbfa2cc5 JK	274	int err;
fbfa2cc5 JK	275
51dd6249 NJ	276	trace_f2fs_truncate_blocks_enter(inode, from);
51dd6249 NJ	277
fbfa2cc5 JK	278	free_from = (pgoff_t)
	279	((from + blocksize - 1) >> (sbi->log_blocksize));
	280
39936837	281	ilock = mutex_lock_op(sbi);
fbfa2cc5	282	set_new_dnode(&dn, inode, NULL, NULL, 0);
266e97a8	283	err = get_dnode_of_data(&dn, free_from, LOOKUP_NODE);
fbfa2cc5 JK	284	if (err) {
	285	if (err == -ENOENT)
	286	goto free_next;
39936837	287	mutex_unlock_op(sbi, ilock);
51dd6249	288	trace_f2fs_truncate_blocks_exit(inode, err);
fbfa2cc5 JK	289	return err;
	290	}
	291
	292	if (IS_INODE(dn.node_page))
de93653f	293	count = ADDRS_PER_INODE(F2FS_I(inode));
fbfa2cc5 JK	294	else
	295	count = ADDRS_PER_BLOCK;
	296
	297	count -= dn.ofs_in_node;
	298	BUG_ON(count < 0);
39936837	299
fbfa2cc5 JK	300	if (dn.ofs_in_node \|\| IS_INODE(dn.node_page)) {
	301	truncate_data_blocks_range(&dn, count);
	302	free_from += count;
	303	}
	304
	305	f2fs_put_dnode(&dn);
	306	free_next:
	307	err = truncate_inode_blocks(inode, free_from);
39936837	308	mutex_unlock_op(sbi, ilock);
fbfa2cc5 JK	309
	310	/* lastly zero out the first data page */
	311	truncate_partial_data_page(inode, from);
	312
51dd6249	313	trace_f2fs_truncate_blocks_exit(inode, err);
fbfa2cc5 JK	314	return err;
	315	}
	316
	317	void f2fs_truncate(struct inode *inode)
	318	{
	319	if (!(S_ISREG(inode->i_mode) \|\| S_ISDIR(inode->i_mode) \|\|
	320	S_ISLNK(inode->i_mode)))
	321	return;
	322
51dd6249 NJ	323	trace_f2fs_truncate(inode);
51dd6249 NJ	324
fbfa2cc5 JK	325	if (!truncate_blocks(inode, i_size_read(inode))) {
	326	inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	327	mark_inode_dirty(inode);
	328	}
fbfa2cc5 JK	329	}
fbfa2cc5 JK	330
2d4d9fb5	331	int f2fs_getattr(struct vfsmount *mnt,
fbfa2cc5 JK	332	struct dentry dentry, struct kstat stat)
	333	{
	334	struct inode *inode = dentry->d_inode;
	335	generic_fillattr(inode, stat);
	336	stat->blocks <<= 3;
	337	return 0;
	338	}
	339
	340	#ifdef CONFIG_F2FS_FS_POSIX_ACL
	341	static void __setattr_copy(struct inode inode, const struct iattr attr)
	342	{
	343	struct f2fs_inode_info *fi = F2FS_I(inode);
	344	unsigned int ia_valid = attr->ia_valid;
	345
	346	if (ia_valid & ATTR_UID)
	347	inode->i_uid = attr->ia_uid;
	348	if (ia_valid & ATTR_GID)
	349	inode->i_gid = attr->ia_gid;
	350	if (ia_valid & ATTR_ATIME)
	351	inode->i_atime = timespec_trunc(attr->ia_atime,
	352	inode->i_sb->s_time_gran);
	353	if (ia_valid & ATTR_MTIME)
	354	inode->i_mtime = timespec_trunc(attr->ia_mtime,
	355	inode->i_sb->s_time_gran);
	356	if (ia_valid & ATTR_CTIME)
	357	inode->i_ctime = timespec_trunc(attr->ia_ctime,
	358	inode->i_sb->s_time_gran);
	359	if (ia_valid & ATTR_MODE) {
	360	umode_t mode = attr->ia_mode;
	361
	362	if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
	363	mode &= ~S_ISGID;
	364	set_acl_inode(fi, mode);
	365	}
	366	}
	367	#else
	368	#define __setattr_copy setattr_copy
	369	#endif
	370
	371	int f2fs_setattr(struct dentry dentry, struct iattr attr)
	372	{
	373	struct inode *inode = dentry->d_inode;
	374	struct f2fs_inode_info *fi = F2FS_I(inode);
	375	int err;
	376
	377	err = inode_change_ok(inode, attr);
	378	if (err)
	379	return err;
	380
	381	if ((attr->ia_valid & ATTR_SIZE) &&
	382	attr->ia_size != i_size_read(inode)) {
	383	truncate_setsize(inode, attr->ia_size);
	384	f2fs_truncate(inode);
d4686d56	385	f2fs_balance_fs(F2FS_SB(inode->i_sb));
fbfa2cc5 JK	386	}
	387
	388	__setattr_copy(inode, attr);
	389
	390	if (attr->ia_valid & ATTR_MODE) {
	391	err = f2fs_acl_chmod(inode);
	392	if (err \|\| is_inode_flag_set(fi, FI_ACL_MODE)) {
	393	inode->i_mode = fi->i_acl_mode;
	394	clear_inode_flag(fi, FI_ACL_MODE);
	395	}
	396	}
	397
	398	mark_inode_dirty(inode);
	399	return err;
	400	}
	401
	402	const struct inode_operations f2fs_file_inode_operations = {
	403	.getattr = f2fs_getattr,
	404	.setattr = f2fs_setattr,
	405	.get_acl = f2fs_get_acl,
	406	#ifdef CONFIG_F2FS_FS_XATTR
	407	.setxattr = generic_setxattr,
	408	.getxattr = generic_getxattr,
	409	.listxattr = f2fs_listxattr,
	410	.removexattr = generic_removexattr,
	411	#endif
	412	};
	413
	414	static void fill_zero(struct inode *inode, pgoff_t index,
	415	loff_t start, loff_t len)
	416	{
bd43df02	417	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
fbfa2cc5	418	struct page *page;
39936837	419	int ilock;
fbfa2cc5 JK	420
	421	if (!len)
	422	return;
	423
bd43df02 JK	424	f2fs_balance_fs(sbi);
bd43df02 JK	425
39936837	426	ilock = mutex_lock_op(sbi);
64aa7ed9	427	page = get_new_data_page(inode, NULL, index, false);
39936837	428	mutex_unlock_op(sbi, ilock);
fbfa2cc5 JK	429
	430	if (!IS_ERR(page)) {
	431	wait_on_page_writeback(page);
	432	zero_user(page, start, len);
	433	set_page_dirty(page);
	434	f2fs_put_page(page, 1);
	435	}
	436	}
	437
	438	int truncate_hole(struct inode *inode, pgoff_t pg_start, pgoff_t pg_end)
	439	{
	440	pgoff_t index;
	441	int err;
	442
	443	for (index = pg_start; index < pg_end; index++) {
	444	struct dnode_of_data dn;
9eaeba70	445
fbfa2cc5	446	set_new_dnode(&dn, inode, NULL, NULL, 0);
266e97a8	447	err = get_dnode_of_data(&dn, index, LOOKUP_NODE);
fbfa2cc5	448	if (err) {
fbfa2cc5 JK	449	if (err == -ENOENT)
	450	continue;
	451	return err;
	452	}
	453
	454	if (dn.data_blkaddr != NULL_ADDR)
	455	truncate_data_blocks_range(&dn, 1);
	456	f2fs_put_dnode(&dn);
fbfa2cc5 JK	457	}
	458	return 0;
	459	}
	460
	461	static int punch_hole(struct inode *inode, loff_t offset, loff_t len, int mode)
	462	{
	463	pgoff_t pg_start, pg_end;
	464	loff_t off_start, off_end;
	465	int ret = 0;
	466
	467	pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
	468	pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;
	469
	470	off_start = offset & (PAGE_CACHE_SIZE - 1);
	471	off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);
	472
	473	if (pg_start == pg_end) {
	474	fill_zero(inode, pg_start, off_start,
	475	off_end - off_start);
	476	} else {
	477	if (off_start)
	478	fill_zero(inode, pg_start++, off_start,
	479	PAGE_CACHE_SIZE - off_start);
	480	if (off_end)
	481	fill_zero(inode, pg_end, 0, off_end);
	482
	483	if (pg_start < pg_end) {
	484	struct address_space *mapping = inode->i_mapping;
	485	loff_t blk_start, blk_end;
1127a3d4	486	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
39936837	487	int ilock;
1127a3d4 JH	488
1127a3d4 JH	489	f2fs_balance_fs(sbi);
fbfa2cc5 JK	490
	491	blk_start = pg_start << PAGE_CACHE_SHIFT;
	492	blk_end = pg_end << PAGE_CACHE_SHIFT;
	493	truncate_inode_pages_range(mapping, blk_start,
	494	blk_end - 1);
39936837 JK	495
39936837 JK	496	ilock = mutex_lock_op(sbi);
fbfa2cc5	497	ret = truncate_hole(inode, pg_start, pg_end);
39936837	498	mutex_unlock_op(sbi, ilock);
fbfa2cc5 JK	499	}
	500	}
	501
	502	if (!(mode & FALLOC_FL_KEEP_SIZE) &&
	503	i_size_read(inode) <= (offset + len)) {
	504	i_size_write(inode, offset);
	505	mark_inode_dirty(inode);
	506	}
	507
	508	return ret;
	509	}
	510
	511	static int expand_inode_data(struct inode *inode, loff_t offset,
	512	loff_t len, int mode)
	513	{
	514	struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
	515	pgoff_t index, pg_start, pg_end;
	516	loff_t new_size = i_size_read(inode);
	517	loff_t off_start, off_end;
	518	int ret = 0;
	519
	520	ret = inode_newsize_ok(inode, (len + offset));
	521	if (ret)
	522	return ret;
	523
	524	pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
	525	pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;
	526
	527	off_start = offset & (PAGE_CACHE_SIZE - 1);
	528	off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);
	529
	530	for (index = pg_start; index <= pg_end; index++) {
	531	struct dnode_of_data dn;
39936837	532	int ilock;
fbfa2cc5	533
39936837	534	ilock = mutex_lock_op(sbi);
fbfa2cc5	535	set_new_dnode(&dn, inode, NULL, NULL, 0);
266e97a8	536	ret = get_dnode_of_data(&dn, index, ALLOC_NODE);
fbfa2cc5	537	if (ret) {
39936837	538	mutex_unlock_op(sbi, ilock);
fbfa2cc5 JK	539	break;
	540	}
	541
	542	if (dn.data_blkaddr == NULL_ADDR) {
	543	ret = reserve_new_block(&dn);
	544	if (ret) {
	545	f2fs_put_dnode(&dn);
39936837	546	mutex_unlock_op(sbi, ilock);
fbfa2cc5 JK	547	break;
	548	}
	549	}
	550	f2fs_put_dnode(&dn);
39936837	551	mutex_unlock_op(sbi, ilock);
fbfa2cc5 JK	552
	553	if (pg_start == pg_end)
	554	new_size = offset + len;
	555	else if (index == pg_start && off_start)
	556	new_size = (index + 1) << PAGE_CACHE_SHIFT;
	557	else if (index == pg_end)
	558	new_size = (index << PAGE_CACHE_SHIFT) + off_end;
	559	else
	560	new_size += PAGE_CACHE_SIZE;
	561	}
	562
	563	if (!(mode & FALLOC_FL_KEEP_SIZE) &&
	564	i_size_read(inode) < new_size) {
	565	i_size_write(inode, new_size);
	566	mark_inode_dirty(inode);
	567	}
	568
	569	return ret;
	570	}
	571
	572	static long f2fs_fallocate(struct file *file, int mode,
	573	loff_t offset, loff_t len)
	574	{
6131ffaa	575	struct inode *inode = file_inode(file);
fbfa2cc5 JK	576	long ret;
	577
	578	if (mode & ~(FALLOC_FL_KEEP_SIZE \| FALLOC_FL_PUNCH_HOLE))
	579	return -EOPNOTSUPP;
	580
	581	if (mode & FALLOC_FL_PUNCH_HOLE)
	582	ret = punch_hole(inode, offset, len, mode);
	583	else
	584	ret = expand_inode_data(inode, offset, len, mode);
	585
3af60a49 NJ	586	if (!ret) {
	587	inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	588	mark_inode_dirty(inode);
	589	}
c01e2853	590	trace_f2fs_fallocate(inode, mode, offset, len, ret);
fbfa2cc5 JK	591	return ret;
	592	}
	593
	594	#define F2FS_REG_FLMASK (~(FS_DIRSYNC_FL \| FS_TOPDIR_FL))
	595	#define F2FS_OTHER_FLMASK (FS_NODUMP_FL \| FS_NOATIME_FL)
	596
	597	static inline __u32 f2fs_mask_flags(umode_t mode, __u32 flags)
	598	{
	599	if (S_ISDIR(mode))
	600	return flags;
	601	else if (S_ISREG(mode))
	602	return flags & F2FS_REG_FLMASK;
	603	else
	604	return flags & F2FS_OTHER_FLMASK;
	605	}
	606
	607	long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
	608	{
6131ffaa	609	struct inode *inode = file_inode(filp);
fbfa2cc5 JK	610	struct f2fs_inode_info *fi = F2FS_I(inode);
	611	unsigned int flags;
	612	int ret;
	613
	614	switch (cmd) {
6a3e8ef0	615	case F2FS_IOC_GETFLAGS:
fbfa2cc5 JK	616	flags = fi->i_flags & FS_FL_USER_VISIBLE;
fbfa2cc5 JK	617	return put_user(flags, (int __user *) arg);
6a3e8ef0	618	case F2FS_IOC_SETFLAGS:
fbfa2cc5 JK	619	{
	620	unsigned int oldflags;
	621
bdaec334	622	ret = mnt_want_write_file(filp);
fbfa2cc5 JK	623	if (ret)
	624	return ret;
	625
	626	if (!inode_owner_or_capable(inode)) {
	627	ret = -EACCES;
	628	goto out;
	629	}
	630
	631	if (get_user(flags, (int __user *) arg)) {
	632	ret = -EFAULT;
	633	goto out;
	634	}
	635
	636	flags = f2fs_mask_flags(inode->i_mode, flags);
	637
	638	mutex_lock(&inode->i_mutex);
	639
	640	oldflags = fi->i_flags;
	641
	642	if ((flags ^ oldflags) & (FS_APPEND_FL \| FS_IMMUTABLE_FL)) {
	643	if (!capable(CAP_LINUX_IMMUTABLE)) {
	644	mutex_unlock(&inode->i_mutex);
	645	ret = -EPERM;
	646	goto out;
	647	}
	648	}
	649
	650	flags = flags & FS_FL_USER_MODIFIABLE;
	651	flags \|= oldflags & ~FS_FL_USER_MODIFIABLE;
	652	fi->i_flags = flags;
	653	mutex_unlock(&inode->i_mutex);
	654
	655	f2fs_set_inode_flags(inode);
	656	inode->i_ctime = CURRENT_TIME;
	657	mark_inode_dirty(inode);
	658	out:
bdaec334	659	mnt_drop_write_file(filp);
fbfa2cc5 JK	660	return ret;
	661	}
	662	default:
	663	return -ENOTTY;
	664	}
	665	}
	666
e9750824 NJ	667	#ifdef CONFIG_COMPAT
	668	long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
	669	{
	670	switch (cmd) {
	671	case F2FS_IOC32_GETFLAGS:
	672	cmd = F2FS_IOC_GETFLAGS;
	673	break;
	674	case F2FS_IOC32_SETFLAGS:
	675	cmd = F2FS_IOC_SETFLAGS;
	676	break;
	677	default:
	678	return -ENOIOCTLCMD;
	679	}
	680	return f2fs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
	681	}
	682	#endif
	683
fbfa2cc5 JK	684	const struct file_operations f2fs_file_operations = {
	685	.llseek = generic_file_llseek,
	686	.read = do_sync_read,
	687	.write = do_sync_write,
	688	.aio_read = generic_file_aio_read,
	689	.aio_write = generic_file_aio_write,
	690	.open = generic_file_open,
	691	.mmap = f2fs_file_mmap,
	692	.fsync = f2fs_sync_file,
	693	.fallocate = f2fs_fallocate,
	694	.unlocked_ioctl = f2fs_ioctl,
e9750824 NJ	695	#ifdef CONFIG_COMPAT
	696	.compat_ioctl = f2fs_compat_ioctl,
	697	#endif
fbfa2cc5 JK	698	.splice_read = generic_file_splice_read,
	699	.splice_write = generic_file_splice_write,
	700	};