Btrfs: fix FS_IOC_SETFLAGS ioctl

Steps to reproduce the bug:

  - Call FS_IOC_SETLFAGS ioctl with flags=FS_COMPR_FL
  - Call FS_IOC_SETFLAGS ioctl with flags=0
  - Call FS_IOC_GETFLAGS ioctl, and you'll see FS_COMPR_FL is still set!

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index aeabf6b..3e7031d 100644 (file)
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -238,6 +238,8 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
        } else if (flags & FS_COMPR_FL) {
                ip->flags |= BTRFS_INODE_COMPRESS;
                ip->flags &= ~BTRFS_INODE_NOCOMPRESS;
+       } else {
+               ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS);
        }
 
        trans = btrfs_join_transaction(root, 1);