Commit eb44d876 authored Jul 25, 2019 by Chao Yu Committed by Jaegeuk Kim Sep 23, 2019

f2fs: disallow direct IO in atomic write



Atomic write needs page cache to cache data of transaction,
direct IO should never be allowed in atomic write, detect
and deny it when open atomic write file.

Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

parent c3d777c7

fs/f2fs/file.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -1836,6 +1836,9 @@ static int f2fs_ioc_start_atomic_write(struct file *filp)
		if (!S_ISREG(inode->i_mode))
		return -EINVAL;

		if (filp->f_flags & O_DIRECT)
		return -EINVAL;

		ret = mnt_want_write_file(filp);
		if (ret)
		return ret;