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ceph: carry explicit msg reference for currently sending message 

Carry a ceph_msg reference for connection->out_msg.  This will allow us to
make out_sent optional.

Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Sage Weil 2009-12-14 14:04:30 -08:00
parent d4a780ce88
commit c86a2930cc
2 changed files with 19 additions and 4 deletions
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22
fs/ceph/messenger.c
View File

@ -322,7 +322,10 @@ static void reset_connection(struct ceph_connection *con)
con->connect_seq = 0;
con->out_seq = 0;
con->out_msg = NULL;
if (con->out_msg) {
ceph_msg_put(con->out_msg);
con->out_msg = NULL;
}
con->in_seq = 0;
mutex_unlock(&con->out_mutex);
}
@ -423,7 +426,7 @@ static void prepare_write_message_footer(struct ceph_connection *con, int v)
con->out_kvec_bytes += sizeof(m->footer);
con->out_kvec_left++;
con->out_more = m->more_to_follow;
con->out_msg = NULL; /* we're done with this one */
con->out_msg_done = true;
}
/*
@ -436,6 +439,7 @@ static void prepare_write_message(struct ceph_connection *con)
con->out_kvec_bytes = 0;
con->out_kvec_is_msg = true;
con->out_msg_done = false;
/* Sneak an ack in there first? If we can get it into the same
* TCP packet that's a good thing. */
@ -452,8 +456,9 @@ static void prepare_write_message(struct ceph_connection *con)
/* move message to sending/sent list */
m = list_first_entry(&con->out_queue,
struct ceph_msg, list_head);
con->out_msg = m;
ceph_msg_get(m);
list_move_tail(&m->list_head, &con->out_sent);
con->out_msg = m; /* we don't bother taking a reference here. */
m->hdr.seq = cpu_to_le64(++con->out_seq);
@ -1521,6 +1526,12 @@ more_kvec:
/* msg pages? */
if (con->out_msg) {
if (con->out_msg_done) {
ceph_msg_put(con->out_msg);
con->out_msg = NULL; /* we're done with this one */
goto do_next;
}
ret = write_partial_msg_pages(con);
if (ret == 1)
goto more_kvec; /* we need to send the footer, too! */
@ -1533,6 +1544,7 @@ more_kvec:
}
}
do_next:
if (!test_bit(CONNECTING, &con->state)) {
/* is anything else pending? */
if (!list_empty(&con->out_queue)) {
@ -1923,8 +1935,10 @@ void ceph_con_revoke(struct ceph_connection *con, struct ceph_msg *msg)
list_del_init(&msg->list_head);
ceph_msg_put(msg);
msg->hdr.seq = 0;
if (con->out_msg == msg)
if (con->out_msg == msg) {
ceph_msg_put(con->out_msg);
con->out_msg = NULL;
}
if (con->out_kvec_is_msg) {
con->out_skip = con->out_kvec_bytes;
con->out_kvec_is_msg = false;

1
fs/ceph/messenger.h
View File

@ -182,6 +182,7 @@ struct ceph_connection {
/* message out temps */
struct ceph_msg *out_msg; /* sending message (== tail of
out_sent) */
bool out_msg_done;
struct ceph_msg_pos out_msg_pos;
struct kvec out_kvec[8], /* sending header/footer data */