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From: David Howells <dhowells@redhat.com>
To: Trond.Myklebust@netapp.com, chuck.lever@oracle.com,
	casey@schaufler-ca.com
Cc: nfsv4@linux-nfs.org, linux-kernel@vger.kernel.org,
	linux-fsdevel@vger.kernel.org, selinux@tycho.nsa.gov,
	linux-security-module@vger.kernel.org, dhowells@redhat.com
Subject: [PATCH 18/37] CacheFiles: Permit the page lock state to be monitored [ver #34]
Date: Fri, 29 Feb 2008 00:45:10 +0000	[thread overview]
Message-ID: <20080229004509.4142.77190.stgit@warthog.procyon.org.uk> (raw)
In-Reply-To: <20080229004332.4142.51771.stgit@warthog.procyon.org.uk>

Add a function to install a monitor on the page lock waitqueue for a particular
page, thus allowing the page being unlocked to be detected.

This is used by CacheFiles to detect read completion on a page in the backing
filesystem so that it can then copy the data to the waiting netfs page.

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

 include/linux/pagemap.h |    5 +++++
 mm/filemap.c            |   18 ++++++++++++++++++
 2 files changed, 23 insertions(+), 0 deletions(-)


diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index c8bd762..76b5307 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -242,6 +242,11 @@ static inline void wait_on_page_owner_priv_2(struct page *page)
 extern void end_page_owner_priv_2(struct page *page);
 
 /*
+ * Add an arbitrary waiter to a page's wait queue
+ */
+extern void add_page_wait_queue(struct page *page, wait_queue_t *waiter);
+
+/*
  * Fault a userspace page into pagetables.  Return non-zero on a fault.
  *
  * This assumes that two userspace pages are always sufficient.  That's
diff --git a/mm/filemap.c b/mm/filemap.c
index a583f44..561e6c7 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -548,6 +548,24 @@ void wait_on_page_bit(struct page *page, int bit_nr)
 EXPORT_SYMBOL(wait_on_page_bit);
 
 /**
+ * add_page_wait_queue - Add an arbitrary waiter to a page's wait queue
+ * @page - Page defining the wait queue of interest
+ * @waiter - Waiter to add to the queue
+ *
+ * Add an arbitrary @waiter to the wait queue for the nominated @page.
+ */
+void add_page_wait_queue(struct page *page, wait_queue_t *waiter)
+{
+	wait_queue_head_t *q = page_waitqueue(page);
+	unsigned long flags;
+
+	spin_lock_irqsave(&q->lock, flags);
+	__add_wait_queue(q, waiter);
+	spin_unlock_irqrestore(&q->lock, flags);
+}
+EXPORT_SYMBOL_GPL(add_page_wait_queue);
+
+/**
  * unlock_page - unlock a locked page
  * @page: the page
  *


  parent reply	other threads:[~2008-02-29  0:57 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-29  0:43 [PATCH 00/37] Permit filesystem local caching " David Howells
2008-02-29  0:43 ` [PATCH 01/37] KEYS: Increase the payload size when instantiating a key " David Howells
2008-02-29  0:43 ` [PATCH 02/37] KEYS: Check starting keyring as part of search " David Howells
2008-02-29  0:43 ` [PATCH 03/37] KEYS: Allow the callout data to be passed as a blob rather than a string " David Howells
2008-02-29  0:43 ` [PATCH 04/37] KEYS: Add keyctl function to get a security label " David Howells
2008-02-29  0:44 ` [PATCH 05/37] Security: Change current->fs[ug]id to current_fs[ug]id() " David Howells
2008-02-29  0:44 ` [PATCH 06/37] Security: Separate task security context from task_struct " David Howells
2008-02-29  0:44 ` [PATCH 07/37] Security: De-embed task security record from task and use refcounting " David Howells
2008-02-29  0:44 ` [PATCH 08/37] Security: Add a kernel_service object class to SELinux " David Howells
2008-02-29  0:44 ` [PATCH 09/37] Security: Allow kernel services to override LSM settings for task actions " David Howells
2008-02-29  0:44 ` [PATCH 10/37] Security: Make NFSD work with detached security " David Howells
2008-02-29  0:44 ` [PATCH 11/37] FS-Cache: Release page->private after failed readahead " David Howells
2008-02-29  0:44 ` [PATCH 12/37] FS-Cache: Recruit a couple of page flags for cache management " David Howells
2008-02-29  0:44 ` [PATCH 13/37] FS-Cache: Provide an add_wait_queue_tail() function " David Howells
2008-02-29  0:44 ` [PATCH 14/37] FS-Cache: Generic filesystem caching facility " David Howells
2008-02-29  0:44 ` [PATCH 15/37] CacheFiles: Add missing copy_page export for ia64 " David Howells
2008-02-29  0:44 ` [PATCH 16/37] CacheFiles: Be consistent about the use of mapping vs file->f_mapping in Ext3 " David Howells
2008-02-29  0:45 ` [PATCH 17/37] CacheFiles: Add a hook to write a single page of data to an inode " David Howells
2008-02-29  0:45 ` David Howells [this message]
2008-02-29  0:45 ` [PATCH 19/37] CacheFiles: Export things for CacheFiles " David Howells
2008-02-29  0:45 ` [PATCH 20/37] CacheFiles: A cache that backs onto a mounted filesystem " David Howells
2008-02-29  0:45 ` [PATCH 21/37] NFS: Add comment banners to some NFS functions " David Howells
2008-02-29  0:45 ` [PATCH 22/37] NFS: Add FS-Cache option bit and debug bit " David Howells
2008-02-29  0:45 ` [PATCH 23/37] NFS: Permit local filesystem caching to be enabled for NFS " David Howells
2008-02-29  0:45 ` [PATCH 24/37] NFS: Register NFS for caching and retrieve the top-level index " David Howells
2008-02-29  0:45 ` [PATCH 25/37] NFS: Define and create server-level objects " David Howells
2008-02-29  0:45 ` [PATCH 26/37] NFS: Define and create superblock-level " David Howells
2008-02-29  0:45 ` [PATCH 27/37] NFS: Define and create inode-level cache " David Howells
2008-02-29  0:46 ` [PATCH 28/37] NFS: Use local disk inode cache " David Howells
2008-02-29  0:46 ` [PATCH 29/37] NFS: Invalidate FsCache page flags when cache removed " David Howells
2008-02-29  0:46 ` [PATCH 30/37] NFS: Add some new I/O event counters for FS-Cache events " David Howells
2008-02-29  0:46 ` [PATCH 31/37] NFS: FS-Cache page management " David Howells
2008-02-29  0:46 ` [PATCH 32/37] NFS: Add read context retention for FS-Cache to call back with " David Howells
2008-02-29  0:46 ` [PATCH 33/37] NFS: nfs_readpage_async() needs to be accessible as a fallback for local caching " David Howells
2008-02-29  0:46 ` [PATCH 34/37] NFS: Read pages from FS-Cache into an NFS inode " David Howells
2008-02-29  0:46 ` [PATCH 35/37] NFS: Store pages from an NFS inode into a local cache " David Howells
2008-02-29  0:46 ` [PATCH 36/37] NFS: Display local caching state " David Howells
2008-02-29  0:46 ` [PATCH 37/37] NFS: Add mount options to enable local caching on NFS " David Howells
2008-03-19 17:12 ` Performance degradation measurement [was Re: [PATCH 06/37] Security: Separate task security context from task_struct [ver #34]] David Howells
2008-03-23  5:17   ` Valdis.Kletnieks
2008-03-23 12:40   ` David Howells

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