Commit 2ff3e9b6 authored by Chris Mason's avatar Chris Mason
Browse files

Add O_SYNC support to btrfs_file_write 



Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
parent b56baf5b

fs/btrfs/file.c

+13 −2
Original line number Diff line number Diff line
@@ -635,8 +635,9 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf, 
				size_t count, loff_t *ppos)

{

	loff_t pos;

	size_t num_written = 0;

	int err = 0;

	loff_t start_pos;

	ssize_t num_written = 0;

	ssize_t err = 0;

	int ret = 0;

	struct inode *inode = file->f_path.dentry->d_inode;

	struct btrfs_root *root = BTRFS_I(inode)->root;
@@ -652,7 +653,10 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf, 
	pinned[1] = NULL;

	if (file->f_flags & O_DIRECT)

		return -EINVAL;



	pos = *ppos;

	start_pos = pos;



	vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);

	current->backing_dev_info = inode->i_mapping->backing_dev_info;

	err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
@@ -743,6 +747,13 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf, 
	if (pinned[1])

		page_cache_release(pinned[1]);

	*ppos = pos;



	if (num_written > 0 && ((file->f_flags & O_SYNC) || IS_SYNC(inode))) {

		err = sync_page_range(inode, inode->i_mapping,

				      start_pos, num_written);

		if (err < 0)

			num_written = err;

	}

	current->backing_dev_info = NULL;

	return num_written ? num_written : err;

}