tree 53cad82bc4ae05b1d2d21a22a2ccde9658e5c8c7
parent a105d685a8483985a01776411de191a726b48132
author Miklos Szeredi <mszeredi@suse.cz> 1416498000 +0100
committer Miklos Szeredi <mszeredi@suse.cz> 1416498000 +0100

ovl: fix race in private xattr checks

Xattr operations can race with copy up.  This does not matter as long as
we consistently fiter out "trunsted.overlay.opaque" attribute on upper
directories.

Previously we checked parent against OVL_PATH_MERGE.  This is too general,
and prone to race with copy-up.  I.e. we found the parent to be on the
lower layer but ovl_dentry_real() would return the copied-up dentry,
possibly with the "opaque" attribute.

So instead use ovl_path_real() and decide to filter the attributes based on
the actual type of the dentry we'll use.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>