Return-Path: Received: from mx2.netapp.com ([216.240.18.37]:41499 "EHLO mx2.netapp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753038Ab0IUUiN (ORCPT ); Tue, 21 Sep 2010 16:38:13 -0400 Message-ID: <4C9917B4.1010607@netapp.com> Date: Tue, 21 Sep 2010 16:38:12 -0400 From: Bryan Schumaker To: "linux-nfs@vger.kernel.org" CC: "J. Bruce Fields" Subject: [PATCH 2/2] lockd: Mostly remove BKL from the server Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-nfs-owner@vger.kernel.org List-ID: MIME-Version: 1.0 lockd: Mostly remove BKL from the server This patch removes all but one call to lock_kernel() from the server. Signed-off-by: Bryan Schumaker --- diff --git a/fs/lockd/svc4proc.c b/fs/lockd/svc4proc.c index 031c656..a336e83 100644 --- a/fs/lockd/svc4proc.c +++ b/fs/lockd/svc4proc.c @@ -230,9 +230,7 @@ static void nlm4svc_callback_exit(struct rpc_task *task, void *data) static void nlm4svc_callback_release(void *data) { - lock_kernel(); nlm_release_call(data); - unlock_kernel(); } static const struct rpc_call_ops nlm4svc_callback_ops = { diff --git a/fs/lockd/svclock.c b/fs/lockd/svclock.c index 84055d3..6f1ef00 100644 --- a/fs/lockd/svclock.c +++ b/fs/lockd/svclock.c @@ -52,12 +52,13 @@ static const struct rpc_call_ops nlmsvc_grant_ops; * The list of blocked locks to retry */ static LIST_HEAD(nlm_blocked); +static DEFINE_SPINLOCK(nlm_blocked_lock); /* * Insert a blocked lock into the global list */ static void -nlmsvc_insert_block(struct nlm_block *block, unsigned long when) +nlmsvc_insert_block_locked(struct nlm_block *block, unsigned long when) { struct nlm_block *b; struct list_head *pos; @@ -87,6 +88,13 @@ nlmsvc_insert_block(struct nlm_block *block, unsigned long when) block->b_when = when; } +static void nlmsvc_insert_block(struct nlm_block *block, unsigned long when) +{ + spin_lock(&nlm_blocked_lock); + nlmsvc_insert_block_locked(block, when); + spin_unlock(&nlm_blocked_lock); +} + /* * Remove a block from the global list */ @@ -94,7 +102,9 @@ static inline void nlmsvc_remove_block(struct nlm_block *block) { if (!list_empty(&block->b_list)) { + spin_lock(&nlm_blocked_lock); list_del_init(&block->b_list); + spin_unlock(&nlm_blocked_lock); nlmsvc_release_block(block); } } @@ -651,7 +661,7 @@ static int nlmsvc_grant_deferred(struct file_lock *fl, struct file_lock *conf, struct nlm_block *block; int rc = -ENOENT; - lock_kernel(); + spin_lock(&nlm_blocked_lock); list_for_each_entry(block, &nlm_blocked, b_list) { if (nlm_compare_locks(&block->b_call->a_args.lock.fl, fl)) { dprintk("lockd: nlmsvc_notify_blocked block %p flags %d\n", @@ -665,13 +675,13 @@ static int nlmsvc_grant_deferred(struct file_lock *fl, struct file_lock *conf, } else if (result == 0) block->b_granted = 1; - nlmsvc_insert_block(block, 0); + nlmsvc_insert_block_locked(block, 0); svc_wake_up(block->b_daemon); rc = 0; break; } } - unlock_kernel(); + spin_unlock(&nlm_blocked_lock); if (rc == -ENOENT) printk(KERN_WARNING "lockd: grant for unknown block\n"); return rc; @@ -803,7 +813,7 @@ static void nlmsvc_grant_callback(struct rpc_task *task, void *data) dprintk("lockd: GRANT_MSG RPC callback\n"); - lock_kernel(); + spin_lock(&nlm_blocked_lock); /* if the block is not on a list at this point then it has * been invalidated. Don't try to requeue it. * @@ -825,19 +835,20 @@ static void nlmsvc_grant_callback(struct rpc_task *task, void *data) /* Call was successful, now wait for client callback */ timeout = 60 * HZ; } - nlmsvc_insert_block(block, timeout); + nlmsvc_insert_block_locked(block, timeout); svc_wake_up(block->b_daemon); out: - unlock_kernel(); + spin_unlock(&nlm_blocked_lock); } +/* + * FIXME: nlmsvc_release_block() grabs a mutex. This is not allowed for an + * .rpc_release rpc_call_op + */ static void nlmsvc_grant_release(void *data) { struct nlm_rqst *call = data; - - lock_kernel(); nlmsvc_release_block(call->a_block); - unlock_kernel(); } static const struct rpc_call_ops nlmsvc_grant_ops = { diff --git a/fs/lockd/svcproc.c b/fs/lockd/svcproc.c index 0f2ab74..c3069f3 100644 --- a/fs/lockd/svcproc.c +++ b/fs/lockd/svcproc.c @@ -260,9 +260,7 @@ static void nlmsvc_callback_exit(struct rpc_task *task, void *data) static void nlmsvc_callback_release(void *data) { - lock_kernel(); nlm_release_call(data); - unlock_kernel(); } static const struct rpc_call_ops nlmsvc_callback_ops = {