From e8897529053d05f5bd677706ba6807fc2f2b942c Mon Sep 17 00:00:00 2001 From: Dave Chinner Date: Tue, 1 Mar 2016 09:41:33 +1100 Subject: [PATCH] xfs: XFS_DIFLAG_DAX is only for regular files or directories Only file data can use DAX, so we should onyl be able to set this flag on regular files. However, the flag also serves as an "inherit" flag at file create time when set on directories, so limit the FS_IOC_FSSETXATTR ioctl to only set this flag on regular files and directories. Signed-off-by: Dave Chinner Reviewed-by: Brian Foster Tested-by: Ross Zwisler Signed-off-by: Dave Chinner --- fs/xfs/xfs_ioctl.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c index 478d04e07f95..ee8f66616cbb 100644 --- a/fs/xfs/xfs_ioctl.c +++ b/fs/xfs/xfs_ioctl.c @@ -1051,6 +1051,14 @@ xfs_ioctl_setattr_xflags( !capable(CAP_LINUX_IMMUTABLE)) return -EPERM; + /* + * It is only valid to set the DAX flag on regular files and + * directories. On directories it serves as an inherit hint. + */ + if ((fa->fsx_xflags & FS_XFLAG_DAX) && + !(S_ISREG(VFS_I(ip)->i_mode) || S_ISDIR(VFS_I(ip)->i_mode))) + return -EINVAL; + xfs_set_diflags(ip, fa->fsx_xflags); xfs_diflags_to_linux(ip); xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG);