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From: Jeff Layton <jlayton@kernel.org>
To: ceph-devel@vger.kernel.org
Cc: idryomov@gmail.com
Subject: [PATCH] ceph: add a new vxattr to return auth mds for an inode
Date: Tue, 27 Jul 2021 07:35:09 -0400	[thread overview]
Message-ID: <20210727113509.7714-1-jlayton@kernel.org> (raw)

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: Jeff Layton <jlayton@kernel.org>
---
 fs/ceph/xattr.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c
index 1242db8d3444..70664a19b8dc 100644
--- a/fs/ceph/xattr.c
+++ b/fs/ceph/xattr.c
@@ -340,6 +340,15 @@ 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)
+{
+	/* return -1 if we don't have auth caps (and thus can't tell) */
+	if (!ci->i_auth_cap)
+		return ceph_fmt_xattr(val, size, "-1");
+	return ceph_fmt_xattr(val, size, "%d", ci->i_auth_cap->session->s_mds);
+}
+
 #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 +482,13 @@ 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 */
 };
 
-- 
2.31.1


             reply	other threads:[~2021-07-27 11:35 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-27 11:35 Jeff Layton [this message]
2021-07-27 14:46 ` Luis Henriques
2021-07-27 15:17   ` Jeff Layton
2021-07-27 15:45     ` Luis Henriques
2021-07-27 15:53       ` Jeff Layton
2021-07-27 18:42 ` [PATCH v2] " Jeff Layton
2021-07-28 10:28   ` Luis Henriques

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