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-rw-r--r--fs/nfs/fscache.c53
1 files changed, 53 insertions, 0 deletions
diff --git a/fs/nfs/fscache.c b/fs/nfs/fscache.c
index e3816eb53fb8..f673d35d8b89 100644
--- a/fs/nfs/fscache.c
+++ b/fs/nfs/fscache.c
@@ -19,6 +19,7 @@
#include <linux/seq_file.h>
#include "internal.h"
+#include "iostat.h"
#include "fscache.h"
#define NFSDBG_FACILITY NFSDBG_FSCACHE
@@ -328,3 +329,55 @@ void nfs_fscache_reset_inode_cookie(struct inode *inode)
}
nfs_fscache_inode_unlock(inode);
}
+
+/*
+ * Release the caching state associated with a page, if the page isn't busy
+ * interacting with the cache.
+ * - Returns true (can release page) or false (page busy).
+ */
+int nfs_fscache_release_page(struct page *page, gfp_t gfp)
+{
+ struct nfs_inode *nfsi = NFS_I(page->mapping->host);
+ struct fscache_cookie *cookie = nfsi->fscache;
+
+ BUG_ON(!cookie);
+
+ if (fscache_check_page_write(cookie, page)) {
+ if (!(gfp & __GFP_WAIT))
+ return 0;
+ fscache_wait_on_page_write(cookie, page);
+ }
+
+ if (PageFsCache(page)) {
+ dfprintk(FSCACHE, "NFS: fscache releasepage (0x%p/0x%p/0x%p)\n",
+ cookie, page, nfsi);
+
+ fscache_uncache_page(cookie, page);
+ nfs_add_fscache_stats(page->mapping->host,
+ NFSIOS_FSCACHE_PAGES_UNCACHED, 1);
+ }
+
+ return 1;
+}
+
+/*
+ * Release the caching state associated with a page if undergoing complete page
+ * invalidation.
+ */
+void __nfs_fscache_invalidate_page(struct page *page, struct inode *inode)
+{
+ struct nfs_inode *nfsi = NFS_I(inode);
+ struct fscache_cookie *cookie = nfsi->fscache;
+
+ BUG_ON(!cookie);
+
+ dfprintk(FSCACHE, "NFS: fscache invalidatepage (0x%p/0x%p/0x%p)\n",
+ cookie, page, nfsi);
+
+ fscache_wait_on_page_write(cookie, page);
+
+ BUG_ON(!PageLocked(page));
+ fscache_uncache_page(cookie, page);
+ nfs_add_fscache_stats(page->mapping->host,
+ NFSIOS_FSCACHE_PAGES_UNCACHED, 1);
+}