Commit 40e309de authored by Jeff Layton's avatar Jeff Layton Committed by Ilya Dryomov
Browse files

ceph: add a new vxattr to return auth mds for an inode 

Add a new vxattr that shows what MDS is authoritative for an inode (if
we happen to have auth caps). If we don't have an auth cap for the inode
then just return -1.

URL: https://tracker.ceph.com/issues/1276


Signed-off-by: default avatarJeff Layton <jlayton@kernel.org>
Reviewed-by: default avatarLuis Henriques <lhenriques@suse.de>
Signed-off-by: default avatarIlya Dryomov <idryomov@gmail.com>
parent 49f8899e

fs/ceph/xattr.c

+19 −0
Original line number Diff line number Diff line
@@ -340,6 +340,18 @@ static ssize_t ceph_vxattrcb_caps(struct ceph_inode_info *ci, char *val, 
			      ceph_cap_string(issued), issued);

}



static ssize_t ceph_vxattrcb_auth_mds(struct ceph_inode_info *ci,

				       char *val, size_t size)

{

	int ret;



	spin_lock(&ci->i_ceph_lock);

	ret = ceph_fmt_xattr(val, size, "%d",

			     ci->i_auth_cap ? ci->i_auth_cap->session->s_mds : -1);

	spin_unlock(&ci->i_ceph_lock);

	return ret;

}



#define CEPH_XATTR_NAME(_type, _name)	XATTR_CEPH_PREFIX #_type "." #_name

#define CEPH_XATTR_NAME2(_type, _name, _name2)	\

	XATTR_CEPH_PREFIX #_type "." #_name "." #_name2
@@ -473,6 +485,13 @@ static struct ceph_vxattr ceph_common_vxattrs[] = { 
		.exists_cb = NULL,

		.flags = VXATTR_FLAG_READONLY,

	},

	{

		.name = "ceph.auth_mds",

		.name_size = sizeof("ceph.auth_mds"),

		.getxattr_cb = ceph_vxattrcb_auth_mds,

		.exists_cb = NULL,

		.flags = VXATTR_FLAG_READONLY,

	},

	{ .name = NULL, 0 }	/* Required table terminator */

};