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xfs: XFS_DIFLAG_DAX is only for regular files or directories

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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 <dchinner@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Tested-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Dave Chinner 2016-03-01 09:41:33 +11:00 committed by Dave Chinner
parent 36f90b0a2d
commit e889752905
1 changed files with 8 additions and 0 deletions
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8
fs/xfs/xfs_ioctl.c
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@ -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);