[PATCH] NFS: Make searching and waiting on busy writeback requests more efficient.
Basically copies the VFS's method for tracking writebacks and applies
it to the struct nfs_page.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/include/linux/nfs_page.h b/include/linux/nfs_page.h
index 39e4895..db40e45 100644
--- a/include/linux/nfs_page.h
+++ b/include/linux/nfs_page.h
@@ -20,6 +20,11 @@
#include <asm/atomic.h>
/*
+ * Valid flags for the radix tree
+ */
+#define NFS_PAGE_TAG_WRITEBACK 1
+
+/*
* Valid flags for a dirty buffer
*/
#define PG_BUSY 0
@@ -62,6 +67,9 @@
unsigned int);
extern int nfs_wait_on_request(struct nfs_page *);
extern void nfs_unlock_request(struct nfs_page *req);
+extern int nfs_set_page_writeback_locked(struct nfs_page *req);
+extern void nfs_clear_page_writeback(struct nfs_page *req);
+
/*
* Lock the page of an asynchronous request without incrementing the wb_count
@@ -96,10 +104,6 @@
{
if (list_empty(&req->wb_list))
return;
- if (!NFS_WBACK_BUSY(req)) {
- printk(KERN_ERR "NFS: unlocked request attempted removed from list!\n");
- BUG();
- }
list_del_init(&req->wb_list);
req->wb_list_head = NULL;
}