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ceph: trim unused inodes before reconnecting to recovering MDS 

So the recovering MDS does not need to fetch these ununsed inodes during
cache rejoin. This may reduce MDS recovery time.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
This commit is contained in:
Yan, Zheng 2014-09-10 16:56:23 +08:00 committed by Ilya Dryomov
parent 589506f1e7
commit 5d23371fdb
1 changed files with 13 additions and 10 deletions
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23
fs/ceph/mds_client.c
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@ -2695,16 +2695,6 @@ static void send_mds_reconnect(struct ceph_mds_client *mdsc,
session->s_state = CEPH_MDS_SESSION_RECONNECTING; session->s_state = CEPH_MDS_SESSION_RECONNECTING;
session->s_seq = 0; session->s_seq = 0;
ceph_con_close(&session->s_con);
ceph_con_open(&session->s_con,
CEPH_ENTITY_TYPE_MDS, mds,
ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
/* replay unsafe requests */
replay_unsafe_requests(mdsc, session);
down_read(&mdsc->snap_rwsem);
dout("session %p state %s\n", session, dout("session %p state %s\n", session,
session_state_name(session->s_state)); session_state_name(session->s_state));
@ -2723,6 +2713,19 @@ static void send_mds_reconnect(struct ceph_mds_client *mdsc,
discard_cap_releases(mdsc, session); discard_cap_releases(mdsc, session);
spin_unlock(&session->s_cap_lock); spin_unlock(&session->s_cap_lock);
/* trim unused caps to reduce MDS's cache rejoin time */
shrink_dcache_parent(mdsc->fsc->sb->s_root);
ceph_con_close(&session->s_con);
ceph_con_open(&session->s_con,
CEPH_ENTITY_TYPE_MDS, mds,
ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
/* replay unsafe requests */
replay_unsafe_requests(mdsc, session);
down_read(&mdsc->snap_rwsem);
/* traverse this session's caps */ /* traverse this session's caps */
s_nr_caps = session->s_nr_caps; s_nr_caps = session->s_nr_caps;
err = ceph_pagelist_encode_32(pagelist, s_nr_caps); err = ceph_pagelist_encode_32(pagelist, s_nr_caps);