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From: NeilBrown <neilb@suse.com>
To: Jeff Layton <jlayton@kernel.org>,
	Alexander Viro <viro@zeniv.linux.org.uk>
Cc: "J. Bruce Fields" <bfields@fieldses.org>,
	Martin Wilck <mwilck@suse.de>,
	linux-fsdevel@vger.kernel.org,
	Frank Filz <ffilzlnx@mindspring.com>,
	linux-kernel@vger.kernel.org
Subject: [PATCH 2/5] fs/locks: split out __locks_wake_up_blocks().
Date: Tue, 14 Aug 2018 13:56:52 +1000
Message-ID: <153421901201.24426.16491496622832329532.stgit@noble> (raw)
In-Reply-To: <153421852728.24426.2111161640156686201.stgit@noble>

This functionality will be useful in future patches, so
split it out from locks_wake_up_blocks().

Signed-off-by: NeilBrown <neilb@suse.com>
---
 fs/locks.c |   27 ++++++++++++++++-----------
 1 file changed, 16 insertions(+), 11 deletions(-)

diff --git a/fs/locks.c b/fs/locks.c
index 322491e70e41..de0b9276f23d 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -681,6 +681,21 @@ static void __locks_delete_block(struct file_lock *waiter)
 	waiter->fl_blocker = NULL;
 }
 
+static void __locks_wake_up_blocks(struct file_lock *blocker)
+{
+	while (!list_empty(&blocker->fl_blocked)) {
+		struct file_lock *waiter;
+
+		waiter = list_first_entry(&blocker->fl_blocked,
+					  struct file_lock, fl_block);
+		__locks_delete_block(waiter);
+		if (waiter->fl_lmops && waiter->fl_lmops->lm_notify)
+			waiter->fl_lmops->lm_notify(waiter);
+		else
+			wake_up(&waiter->fl_wait);
+	}
+}
+
 static void locks_delete_block(struct file_lock *waiter)
 {
 	spin_lock(&blocked_lock_lock);
@@ -735,17 +750,7 @@ static void locks_wake_up_blocks(struct file_lock *blocker)
 		return;
 
 	spin_lock(&blocked_lock_lock);
-	while (!list_empty(&blocker->fl_blocked)) {
-		struct file_lock *waiter;
-
-		waiter = list_first_entry(&blocker->fl_blocked,
-				struct file_lock, fl_block);
-		__locks_delete_block(waiter);
-		if (waiter->fl_lmops && waiter->fl_lmops->lm_notify)
-			waiter->fl_lmops->lm_notify(waiter);
-		else
-			wake_up(&waiter->fl_wait);
-	}
+	__locks_wake_up_blocks(blocker);
 	spin_unlock(&blocked_lock_lock);
 }
 



  parent reply index

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-14  3:56 [PATCH 0/5 v2] locks: avoid thundering-herd wake-ups NeilBrown
2018-08-14  3:56 ` [PATCH 5/5] fs/locks: create a tree of dependent requests NeilBrown
2018-08-14  3:56 ` [PATCH 3/5] fs/locks: allow a lock request to block other requests NeilBrown
2018-08-14  3:56 ` NeilBrown [this message]
2018-08-14  3:56 ` [PATCH 1/5] fs/locks: rename some lists and pointers NeilBrown
2018-08-14  3:56 ` [PATCH 4/5] fs/locks: change all *_conflict() functions to return bool NeilBrown
2018-08-14 18:41 ` [PATCH 0/5 v2] locks: avoid thundering-herd wake-ups J. Bruce Fields
2018-08-14 19:12   ` Jeff Layton

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