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authorAlex Elder <elder@dreamhost.com>2012-02-14 14:05:33 -0600
committerAlex Elder <elder@dreamhost.com>2012-03-22 10:47:51 -0500
commitd3002b974cefbb7c1e325cc296966f768ff76b06 (patch)
tree8685d72f6530959c4e19c4c9f3a12709ec1f4b08 /net
parent41617d0c9c9832e030667277ddf6b4ffb4ecdc90 (diff)
libceph: a few small changes
This gathers a number of very minor changes: - use %hu when formatting the a socket address's address family - null out the ceph_msgr_wq pointer after the queue has been destroyed - drop a needless cast in ceph_write_space() - add a WARN() call in ceph_state_change() in the event an unrecognized socket state is encountered - rearrange the logic in ceph_con_get() and ceph_con_put() so that: - the reference counts are only atomically read once - the values displayed via dout() calls are known to be meaningful at the time they are formatted Signed-off-by: Alex Elder <elder@dreamhost.com> Signed-off-by: Sage Weil <sage@newdream.net>
Diffstat (limited to 'net')
-rw-r--r--net/ceph/messenger.c32
1 files changed, 18 insertions, 14 deletions
diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index e1e53bb2d0cf..44d8c77cabdd 100644
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -80,8 +80,8 @@ const char *ceph_pr_addr(const struct sockaddr_storage *ss)
break;
default:
- snprintf(s, MAX_ADDR_STR_LEN, "(unknown sockaddr family %d)",
- (int)ss->ss_family);
+ snprintf(s, MAX_ADDR_STR_LEN, "(unknown sockaddr family %hu)",
+ ss->ss_family);
}
return s;
@@ -101,8 +101,10 @@ static struct workqueue_struct *ceph_msgr_wq;
void _ceph_msgr_exit(void)
{
- if (ceph_msgr_wq)
+ if (ceph_msgr_wq) {
destroy_workqueue(ceph_msgr_wq);
+ ceph_msgr_wq = NULL;
+ }
BUG_ON(zero_page_address == NULL);
zero_page_address = NULL;
@@ -167,8 +169,7 @@ static void ceph_data_ready(struct sock *sk, int count_unused)
/* socket has buffer space for writing */
static void ceph_write_space(struct sock *sk)
{
- struct ceph_connection *con =
- (struct ceph_connection *)sk->sk_user_data;
+ struct ceph_connection *con = sk->sk_user_data;
/* only queue to workqueue if there is data we want to write,
* and there is sufficient space in the socket buffer to accept
@@ -216,6 +217,8 @@ static void ceph_state_change(struct sock *sk)
dout("ceph_state_change TCP_ESTABLISHED\n");
queue_con(con);
break;
+ default: /* Everything else is uninteresting */
+ break;
}
}
@@ -420,22 +423,23 @@ bool ceph_con_opened(struct ceph_connection *con)
*/
struct ceph_connection *ceph_con_get(struct ceph_connection *con)
{
- dout("con_get %p nref = %d -> %d\n", con,
- atomic_read(&con->nref), atomic_read(&con->nref) + 1);
- if (atomic_inc_not_zero(&con->nref))
- return con;
- return NULL;
+ int nref = __atomic_add_unless(&con->nref, 1, 0);
+
+ dout("con_get %p nref = %d -> %d\n", con, nref, nref + 1);
+
+ return nref ? con : NULL;
}
void ceph_con_put(struct ceph_connection *con)
{
- dout("con_put %p nref = %d -> %d\n", con,
- atomic_read(&con->nref), atomic_read(&con->nref) - 1);
- BUG_ON(atomic_read(&con->nref) == 0);
- if (atomic_dec_and_test(&con->nref)) {
+ int nref = atomic_dec_return(&con->nref);
+
+ BUG_ON(nref < 0);
+ if (nref == 0) {
BUG_ON(con->sock);
kfree(con);
}
+ dout("con_put %p nref = %d -> %d\n", con, nref + 1, nref);
}
/*