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author | Alex Elder <elder@dreamhost.com> | 2012-02-14 14:05:33 -0600 |
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committer | Alex Elder <elder@dreamhost.com> | 2012-03-22 10:47:51 -0500 |
commit | d3002b974cefbb7c1e325cc296966f768ff76b06 (patch) | |
tree | 8685d72f6530959c4e19c4c9f3a12709ec1f4b08 /net/ceph | |
parent | 41617d0c9c9832e030667277ddf6b4ffb4ecdc90 (diff) | |
download | linux-stable-d3002b974cefbb7c1e325cc296966f768ff76b06.tar.gz linux-stable-d3002b974cefbb7c1e325cc296966f768ff76b06.tar.bz2 linux-stable-d3002b974cefbb7c1e325cc296966f768ff76b06.zip |
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/ceph')
-rw-r--r-- | net/ceph/messenger.c | 32 |
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); } /* |