cifs: store pages into local cache

Store pages from an CIFS inode into the data storage object associated with
that inode.
Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de>
Signed-off-by: Steve French <sfrench@us.ibm.com>

fs/cifs/file.c

@@ -1944,6 +1944,9 @@ static void cifs_copy_cache_pages(struct address_space *mapping,
 		SetPageUptodate(page);
 		unlock_page(page);
 		data += PAGE_CACHE_SIZE;
+
+		/* add page to FS-Cache */
+		cifs_readpage_to_fscache(mapping->host, page);
 	}
 	return;
 }
@@ -2113,6 +2116,10 @@ static int cifs_readpage_worker(struct file *file, struct page *page,
 
 	flush_dcache_page(page);
 	SetPageUptodate(page);
+
+	/* send this page to the cache */
+	cifs_readpage_to_fscache(file->f_path.dentry->d_inode, page);
+
 	rc = 0;
 
 io_error:

fs/cifs/fscache.c

@@ -140,6 +140,17 @@ int cifs_fscache_release_page(struct page *page, gfp_t gfp)
 	return 1;
 }
 
+void __cifs_readpage_to_fscache(struct inode *inode, struct page *page)
+{
+	int ret;
+
+	cFYI(1, "CIFS: readpage_to_fscache(fsc: %p, p: %p, i: %p",
+			CIFS_I(inode)->fscache, page, inode);
+	ret = fscache_write_page(CIFS_I(inode)->fscache, page, GFP_KERNEL);
+	if (ret != 0)
+		fscache_uncache_page(CIFS_I(inode)->fscache, page);
+}
+
 void __cifs_fscache_invalidate_page(struct page *page, struct inode *inode)
 {
 	struct cifsInodeInfo *cifsi = CIFS_I(inode);

fs/cifs/fscache.h

@@ -51,6 +51,8 @@ extern void cifs_fscache_reset_inode_cookie(struct inode *);
 extern void __cifs_fscache_invalidate_page(struct page *, struct inode *);
 extern int cifs_fscache_release_page(struct page *page, gfp_t gfp);
 
+extern void __cifs_readpage_to_fscache(struct inode *, struct page *);
+
 static inline void cifs_fscache_invalidate_page(struct page *page,
 					       struct inode *inode)
 {
@@ -58,6 +60,13 @@ static inline void cifs_fscache_invalidate_page(struct page *page,
 		__cifs_fscache_invalidate_page(page, inode);
 }
 
+static inline void cifs_readpage_to_fscache(struct inode *inode,
+					    struct page *page)
+{
+	if (PageFsCache(page))
+		__cifs_readpage_to_fscache(inode, page);
+}
+
 #else /* CONFIG_CIFS_FSCACHE */
 static inline int cifs_fscache_register(void) { return 0; }
 static inline void cifs_fscache_unregister(void) {}
@@ -81,6 +90,8 @@ static inline void cifs_fscache_release_page(struct page *page, gfp_t gfp)
 
 static inline int cifs_fscache_invalidate_page(struct page *page,
 			struct inode *) {}
+static inline void cifs_readpage_to_fscache(struct inode *inode,
+			struct page *page) {}
 
 #endif /* CONFIG_CIFS_FSCACHE */