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From: Jeff Layton <jlayton@kernel.org>
To: ceph-devel@vger.kernel.org
Cc: idryomov@gmail.com, pdonnell@redhat.com, lhenriques@suse.de
Subject: [PATCH v2] ceph: add a new vxattr to return auth mds for an inode
Date: Tue, 27 Jul 2021 14:42:53 -0400	[thread overview]
Message-ID: <20210727184253.171816-1-jlayton@kernel.org> (raw)
In-Reply-To: <20210727113509.7714-1-jlayton@kernel.org>

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 | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

v2: ensure we hold the i_ceph_lock when working with the i_auth_cap.

diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c
index 1242db8d3444..159a1ffa4f4b 100644
--- a/fs/ceph/xattr.c
+++ b/fs/ceph/xattr.c
@@ -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 */
 };
 
-- 
2.31.1


  parent reply	other threads:[~2021-07-27 18:42 UTC|newest]

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

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