linux-kernel - [PATCH 5/7] Cifs: Introduce routine for uncaching single no-data page

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Date:	Mon, 11 Nov 2013 23:27:27 +0800
From:	Li Wang <liwang@...ntukylin.com>
To:	linux-kernel@...r.kernel.org
Cc:	ceph-devel@...r.kernel.org, Sage Weil <sage@...tank.com>,
	linux-fsdevel@...r.kernel.org, linux-cifs@...r.kernel.org,
	Milosz Tanski <milosz@...in.com>,
	Li Wang <liwang@...ntukylin.com>
Subject: [PATCH 5/7] Cifs: Introduce routine for uncaching single no-data page

Introduce a routine for uncaching single no-data page, typically
in readpage().

Signed-off-by: Li Wang <liwang@...ntukylin.com>
---
 fs/cifs/fscache.h |   13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/fs/cifs/fscache.h b/fs/cifs/fscache.h
index 24794b6..c712f42 100644
--- a/fs/cifs/fscache.h
+++ b/fs/cifs/fscache.h
@@ -54,6 +54,7 @@ extern int __cifs_readpages_from_fscache(struct inode *,
 					 struct address_space *,
 					 struct list_head *,
 					 unsigned *);
+extern void __cifs_fscache_readpage_cancel(struct inode *, struct page *);
 extern void __cifs_fscache_readpages_cancel(struct inode *, struct list_head *);
 
 extern void __cifs_readpage_to_fscache(struct inode *, struct page *);
@@ -92,6 +93,13 @@ static inline void cifs_readpage_to_fscache(struct inode *inode,
 		__cifs_readpage_to_fscache(inode, page);
 }
 
+static inline void cifs_fscache_readpage_cancel(struct inode *inode,
+						struct page *page)
+{
+	if (CIFS_I(inode)->fscache)
+		return __cifs_fscache_readpage_cancel(inode, page);
+}
+
 static inline void cifs_fscache_readpages_cancel(struct inode *inode,
 						 struct list_head *pages)
 {
@@ -139,6 +147,11 @@ static inline int cifs_readpages_from_fscache(struct inode *inode,
 static inline void cifs_readpage_to_fscache(struct inode *inode,
 			struct page *page) {}
 
+static inline void cifs_fscache_readpage_cancel(struct inode *inode,
+						struct page *page)
+{
+}
+
 static inline void cifs_fscache_readpages_cancel(struct inode *inode,
 						 struct list_head *pages)
 {
-- 
1.7.9.5

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