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[PATCH 09/24] FS-Cache: Provide an add_wait_queue_tail() function

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From: David Howells <dhowells@...>
To: <viro@...>, <hch@...>, <Trond.Myklebust@...>, <sds@...>, <casey@...>
Cc: <linux-kernel@...>, <selinux@...>, <linux-security-module@...>, <dhowells@...>
Subject: [PATCH 09/24] FS-Cache: Provide an add_wait_queue_tail() function
Date: Wednesday, September 26, 2007 - 10:21 am

Provide an add_wait_queue_tail() function to add a waiter to the back of a
wait queue instead of the front.

Signed-off-by: David Howells <dhowells@redhat.com>
---

 include/linux/wait.h |    1 +
 kernel/wait.c        |   18 ++++++++++++++++++
 2 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/include/linux/wait.h b/include/linux/wait.h
index 0e68628..4cae7db 100644
--- a/include/linux/wait.h
+++ b/include/linux/wait.h
@@ -118,6 +118,7 @@ static inline int waitqueue_active(wait_queue_head_t *q)
 #define is_sync_wait(wait)	(!(wait) || ((wait)->private))
 
 extern void FASTCALL(add_wait_queue(wait_queue_head_t *q, wait_queue_t * wait));
+extern void FASTCALL(add_wait_queue_tail(wait_queue_head_t *q, wait_queue_t * wait));
 extern void FASTCALL(add_wait_queue_exclusive(wait_queue_head_t *q, wait_queue_t * wait));
 extern void FASTCALL(remove_wait_queue(wait_queue_head_t *q, wait_queue_t * wait));
 
diff --git a/kernel/wait.c b/kernel/wait.c
index 444ddbf..7acc9cc 100644
--- a/kernel/wait.c
+++ b/kernel/wait.c
@@ -29,6 +29,24 @@ void fastcall add_wait_queue(wait_queue_head_t *q, wait_queue_t *wait)
 }
 EXPORT_SYMBOL(add_wait_queue);
 
+/**
+ * add_wait_queue_tail - Add a waiter to the back of a waitqueue
+ * @q: the wait queue to append the waiter to
+ * @wait: the waiter to be queued
+ *
+ * Add a waiter to the back of a waitqueue so that it gets woken up last.
+ */
+void fastcall add_wait_queue_tail(wait_queue_head_t *q, wait_queue_t *wait)
+{
+	unsigned long flags;
+
+	wait->flags &= ~WQ_FLAG_EXCLUSIVE;
+	spin_lock_irqsave(&q->lock, flags);
+	__add_wait_queue_tail(q, wait);
+	spin_unlock_irqrestore(&q->lock, flags);
+}
+EXPORT_SYMBOL(add_wait_queue_tail);
+
 void fastcall add_wait_queue_exclusive(wait_queue_head_t *q, wait_queue_t *wait)
 {
 	unsigned long flags;

-
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Messages in current thread:
[PATCH 00/24] Introduce credential record, David Howells, (Wed Sep 26, 10:20 am)
[PATCH 24/24] FS-Cache: Make kAFS use FS-Cache, David Howells, (Wed Sep 26, 10:23 am)
[PATCH 22/24] AFS: Implement shared-writable mmap, David Howells, (Wed Sep 26, 10:22 am)
[PATCH 23/24] AF_RXRPC: Save the operation ID for debugging, David Howells, (Wed Sep 26, 10:22 am)
[PATCH 20/24] AFS: Add a function to excise a rejected write..., David Howells, (Wed Sep 26, 10:22 am)
[PATCH 21/24] AFS: Improve handling of a rejected writeback, David Howells, (Wed Sep 26, 10:22 am)
[PATCH 15/24] CacheFiles: A cache that backs onto a mounted ..., David Howells, (Wed Sep 26, 10:22 am)
[PATCH 16/24] NFS: Use local caching, David Howells, (Wed Sep 26, 10:22 am)
[PATCH 17/24] NFS: Configuration and mount option changes to..., David Howells, (Wed Sep 26, 10:22 am)
[PATCH 18/24] NFS: Display local caching state, David Howells, (Wed Sep 26, 10:22 am)
[PATCH 14/24] CacheFiles: Export things for CacheFiles, David Howells, (Wed Sep 26, 10:22 am)
[PATCH 19/24] AFS: Add TestSetPageError(), David Howells, (Wed Sep 26, 10:22 am)
[PATCH 10/24] FS-Cache: Generic filesystem caching facility, David Howells, (Wed Sep 26, 10:21 am)
[PATCH 12/24] CacheFiles: Add a hook to write a single page ..., David Howells, (Wed Sep 26, 10:22 am)
[PATCH 13/24] CacheFiles: Permit the page lock state to be m..., David Howells, (Wed Sep 26, 10:22 am)
[PATCH 01/24] CRED: Introduce a COW credentials record, David Howells, (Wed Sep 26, 10:21 am)
Re: [PATCH 01/24] CRED: Introduce a COW credentials record, Al Viro, (Wed Sep 26, 2:08 pm)
Re: [PATCH 01/24] CRED: Introduce a COW credentials record, David Howells, (Wed Sep 26, 5:08 pm)
[PATCH 05/24] CRED: Fix up the other credentials references, David Howells, (Wed Sep 26, 10:21 am)
[PATCH 07/24] FS-Cache: Release page-&gt;private after faile..., David Howells, (Wed Sep 26, 10:21 am)
[PATCH 11/24] CacheFiles: Add missing copy_page export for i..., David Howells, (Wed Sep 26, 10:21 am)
[PATCH 09/24] FS-Cache: Provide an add_wait_queue_tail() fun..., David Howells, (Wed Sep 26, 10:21 am)
[PATCH 08/24] FS-Cache: Recruit a couple of page flags for c..., David Howells, (Wed Sep 26, 10:21 am)
[PATCH 06/24] CRED: Request a credential record for a kernel..., David Howells, (Wed Sep 26, 10:21 am)
[PATCH 02/24] CRED: Split the task security data and move pa..., David Howells, (Wed Sep 26, 10:21 am)
[PATCH 04/24] CRED: Move the effective capabilities into the..., David Howells, (Wed Sep 26, 10:21 am)
[PATCH 03/24] CRED: Alter security_task_getsecid() and simil..., David Howells, (Wed Sep 26, 10:21 am)