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ceph: dicard cap releases on mds restart

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If the MDS restarts, the expire caps state is no longer shared, and can be
thrown out.  Caps state will be rebuilt on the MDS during the reconnect
process that follows.  Zero out any release messages and adjust the
release counter accordingly.

Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Sage Weil 2010-05-10 15:36:44 -07:00
parent f8c76f6f25
commit e01a594646
1 changed files with 41 additions and 0 deletions
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41
fs/ceph/mds_client.c
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@ -1157,6 +1157,44 @@ static void send_cap_releases(struct ceph_mds_client *mdsc,
spin_unlock(&session->s_cap_lock);
}
static void discard_cap_releases(struct ceph_mds_client *mdsc,
struct ceph_mds_session *session)
{
struct ceph_msg *msg;
struct ceph_mds_cap_release *head;
unsigned num;
dout("discard_cap_releases mds%d\n", session->s_mds);
spin_lock(&session->s_cap_lock);
/* zero out the in-progress message */
msg = list_first_entry(&session->s_cap_releases,
struct ceph_msg, list_head);
head = msg->front.iov_base;
num = le32_to_cpu(head->num);
dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg, num);
head->num = cpu_to_le32(0);
session->s_num_cap_releases += num;
/* requeue completed messages */
while (!list_empty(&session->s_cap_releases_done)) {
msg = list_first_entry(&session->s_cap_releases_done,
struct ceph_msg, list_head);
list_del_init(&msg->list_head);
head = msg->front.iov_base;
num = le32_to_cpu(head->num);
dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg,
num);
session->s_num_cap_releases += num;
head->num = cpu_to_le32(0);
msg->front.iov_len = sizeof(*head);
list_add(&msg->list_head, &session->s_cap_releases);
}
spin_unlock(&session->s_cap_lock);
}
/*
* requests
*/
@ -2183,6 +2221,9 @@ static void send_mds_reconnect(struct ceph_mds_client *mdsc, int mds)
dout("session %p state %s\n", session,
session_state_name(session->s_state));
/* drop old cap expires; we're about to reestablish that state */
discard_cap_releases(mdsc, session);
/* traverse this session's caps */
err = ceph_pagelist_encode_32(pagelist, session->s_nr_caps);
if (err)