From 34b6c855fafc54ef130649809cd580f98e3f8416 Mon Sep 17 00:00:00 2001
From: Sage Weil <sage@newdream.net>
Date: Mon, 10 May 2010 16:31:25 -0700
Subject: [PATCH] ceph: clean up send_mds_reconnect interface
Pass a ceph_mds_session, since the caller has it.
Remove the dead code for sending empty reconnects. It used to be used
when the MDS contacted _us_ to solicit a reconnect, and we could reply
saying "go away, I have no session." Now we only send reconnects based
on the mds map, and only when we do in fact have an open session.
Signed-off-by: Sage Weil <sage@newdream.net>
---
fs/ceph/mds_client.c | 47 +++++++++++++++-----------------------------
1 file changed, 16 insertions(+), 31 deletions(-)
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 972ec5ae2ac4..e310b4be5588 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -2177,50 +2177,38 @@ static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
*
* called with mdsc->mutex held.
*/
-static void send_mds_reconnect(struct ceph_mds_client *mdsc, int mds)
+static void send_mds_reconnect(struct ceph_mds_client *mdsc,
+ struct ceph_mds_session *session)
{
- struct ceph_mds_session *session = NULL;
struct ceph_msg *reply;
struct rb_node *p;
+ int mds = session->s_mds;
int err = -ENOMEM;
struct ceph_pagelist *pagelist;
- pr_info("reconnect to recovering mds%d\n", mds);
+ pr_info("mds%d reconnect start\n", mds);
pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
if (!pagelist)
goto fail_nopagelist;
ceph_pagelist_init(pagelist);
- err = -ENOMEM;
reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0);
if (!reply)
goto fail_nomsg;
- /* find session */
- session = __ceph_lookup_mds_session(mdsc, mds);
- mutex_unlock(&mdsc->mutex); /* drop lock for duration */
-
- if (session) {
- mutex_lock(&session->s_mutex);
-
- session->s_state = CEPH_MDS_SESSION_RECONNECTING;
- session->s_seq = 0;
+ mutex_lock(&session->s_mutex);
+ session->s_state = CEPH_MDS_SESSION_RECONNECTING;
+ session->s_seq = 0;
- ceph_con_open(&session->s_con,
- ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
+ ceph_con_open(&session->s_con,
+ ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
- /* replay unsafe requests */
- replay_unsafe_requests(mdsc, session);
- } else {
- dout("no session for mds%d, will send short reconnect\n",
- mds);
- }
+ /* replay unsafe requests */
+ replay_unsafe_requests(mdsc, session);
down_read(&mdsc->snap_rwsem);
- if (!session)
- goto send;
dout("session %p state %s\n", session,
session_state_name(session->s_state));
@@ -2255,7 +2243,6 @@ static void send_mds_reconnect(struct ceph_mds_client *mdsc, int mds)
goto fail;
}
-send:
reply->pagelist = pagelist;
reply->hdr.data_len = cpu_to_le32(pagelist->length);
reply->nr_pages = calc_pages_for(0, pagelist->length);
@@ -2267,23 +2254,18 @@ static void send_mds_reconnect(struct ceph_mds_client *mdsc, int mds)
__wake_requests(mdsc, &session->s_waiting);
mutex_unlock(&mdsc->mutex);
- ceph_put_mds_session(session);
-
up_read(&mdsc->snap_rwsem);
- mutex_lock(&mdsc->mutex);
return;
fail:
ceph_msg_put(reply);
up_read(&mdsc->snap_rwsem);
mutex_unlock(&session->s_mutex);
- ceph_put_mds_session(session);
fail_nomsg:
ceph_pagelist_release(pagelist);
kfree(pagelist);
fail_nopagelist:
pr_err("error %d preparing reconnect for mds%d\n", err, mds);
- mutex_lock(&mdsc->mutex);
return;
}
@@ -2345,8 +2327,11 @@ static void check_new_map(struct ceph_mds_client *mdsc,
* send reconnect?
*/
if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
- newstate >= CEPH_MDS_STATE_RECONNECT)
- send_mds_reconnect(mdsc, i);
+ newstate >= CEPH_MDS_STATE_RECONNECT) {
+ mutex_unlock(&mdsc->mutex);
+ send_mds_reconnect(mdsc, s);
+ mutex_lock(&mdsc->mutex);
+ }
/*
* kick request on any mds that has gone active.
--
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