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| author | Sage Weil <sage@newdream.net> | 2010-04-14 01:07:07 +0400 |
|---|---|---|
| committer | Sage Weil <sage@newdream.net> | 2010-04-14 01:07:07 +0400 |
| commit | a6a5349d17f2a5c37079826f1a1474c3d08c6b53 (patch) | |
| tree | 3b37dadbf297abdd65b3f63ac8e94a6137098198 /fs | |
| parent | e1e4dd0caa63e166afa46a1ccc947bebb4f66bcf (diff) | |
| download | linux-a6a5349d17f2a5c37079826f1a1474c3d08c6b53.tar.xz | |
ceph: use separate class for ceph sockets' sk_lock
Use a separate class for ceph sockets to prevent lockdep confusion.
Because ceph sockets only get passed kernel pointers, there is no
dependency from sk_lock -> mmap_sem. If we share the same class as other
sockets, lockdep detects a circular dependency from
mmap_sem (page fault) -> fs mutex -> sk_lock -> mmap_sem
because dependencies are noted from both ceph and user contexts. Using
a separate class prevents the sk_lock(ceph) -> mmap_sem dependency and
makes lockdep happy.
Signed-off-by: Sage Weil <sage@newdream.net>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/ceph/messenger.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/ceph/messenger.c b/fs/ceph/messenger.c index f35b4945a9c3..5c75d5d32b27 100644 --- a/fs/ceph/messenger.c +++ b/fs/ceph/messenger.c @@ -29,6 +29,10 @@ static char tag_msg = CEPH_MSGR_TAG_MSG; static char tag_ack = CEPH_MSGR_TAG_ACK; static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE; +#ifdef CONFIG_LOCKDEP +static struct lock_class_key socket_class; +#endif + static void queue_con(struct ceph_connection *con); static void con_work(struct work_struct *); @@ -227,6 +231,10 @@ static struct socket *ceph_tcp_connect(struct ceph_connection *con) con->sock = sock; sock->sk->sk_allocation = GFP_NOFS; +#ifdef CONFIG_LOCKDEP + lockdep_set_class(&sock->sk->sk_lock, &socket_class); +#endif + set_sock_callbacks(sock, con); dout("connect %s\n", pr_addr(&con->peer_addr.in_addr)); |