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[PATCH] NFS: Make searching and waiting on busy writeback requests more efficient.

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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>
This commit is contained in:
Trond Myklebust 2005-06-22 17:16:30 +00:00
parent ab0a3dbedc
commit c6a556b88a
4 changed files with 45 additions and 18 deletions
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12
include/linux/nfs_page.h
View file

@ -19,6 +19,11 @@
#include <asm/atomic.h>
/*
* Valid flags for the radix tree
*/
#define NFS_PAGE_TAG_WRITEBACK 1
/*
* Valid flags for a dirty buffer
*/
@ -62,6 +67,9 @@ extern int nfs_coalesce_requests(struct list_head *, struct list_head *,
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 @@ nfs_list_remove_request(struct nfs_page *req)
{
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;
}