NFS: Store pages from an NFS inode into a local cache

Store pages from an NFS inode into the cache data storage object associated
with that inode.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Steve Dickson <steved@redhat.com>
Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Tested-by: Daire Byrne <Daire.Byrne@framestore.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/fs/nfs/fscache.h b/fs/nfs/fscache.h
index 099349c171ca..1ec3ebb0efcd 100644
--- a/fs/nfs/fscache.h
+++ b/fs/nfs/fscache.h
@@ -91,6 +91,7 @@ extern int __nfs_readpage_from_fscache(struct nfs_open_context *,
 extern int __nfs_readpages_from_fscache(struct nfs_open_context *,
                                         struct inode *, struct address_space *,
                                         struct list_head *, unsigned *);
+extern void __nfs_readpage_to_fscache(struct inode *, struct page *, int);
 
 /*
  * wait for a page to complete writing to the cache
@@ -140,6 +141,19 @@ static inline int nfs_readpages_from_fscache(struct nfs_open_context *ctx,
         return -ENOBUFS;
 }
 
+/*
+ * Store a page newly fetched from the server in an inode data storage object
+ * in the cache.
+ */
+static inline void nfs_readpage_to_fscache(struct inode *inode,
+                                           struct page *page,
+                                           int sync)
+{
+        if (PageFsCache(page))
+                __nfs_readpage_to_fscache(inode, page, sync);
+}
+
+
 #else /* CONFIG_NFS_FSCACHE */
 static inline int nfs_fscache_register(void) { return 0; }
 static inline void nfs_fscache_unregister(void) {}
@@ -184,6 +198,8 @@ static inline int nfs_readpages_from_fscache(struct nfs_open_context *ctx,
 {
         return -ENOBUFS;
 }
+static inline void nfs_readpage_to_fscache(struct inode *inode,
+                                           struct page *page, int sync) {}
 
 #endif /* CONFIG_NFS_FSCACHE */
 #endif /* _NFS_FSCACHE_H */