mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-29 23:53:32 +00:00
a911fd9a60
Minor cleanup: inlined bit ops in nfs_page.h can be simpler. Test plan: Write-intensive workload against a server that requires COMMITs. Signed-off-by: Chuck Lever <cel@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
163 lines
4 KiB
C
163 lines
4 KiB
C
/*
|
|
* linux/include/linux/nfs_page.h
|
|
*
|
|
* Copyright (C) 2000 Trond Myklebust
|
|
*
|
|
* NFS page cache wrapper.
|
|
*/
|
|
|
|
#ifndef _LINUX_NFS_PAGE_H
|
|
#define _LINUX_NFS_PAGE_H
|
|
|
|
|
|
#include <linux/list.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/wait.h>
|
|
#include <linux/nfs_fs_sb.h>
|
|
#include <linux/sunrpc/auth.h>
|
|
#include <linux/nfs_xdr.h>
|
|
|
|
#include <asm/atomic.h>
|
|
|
|
/*
|
|
* Valid flags for the radix tree
|
|
*/
|
|
#define NFS_PAGE_TAG_DIRTY 0
|
|
#define NFS_PAGE_TAG_WRITEBACK 1
|
|
|
|
/*
|
|
* Valid flags for a dirty buffer
|
|
*/
|
|
#define PG_BUSY 0
|
|
#define PG_NEED_COMMIT 1
|
|
#define PG_NEED_RESCHED 2
|
|
|
|
struct nfs_inode;
|
|
struct nfs_page {
|
|
struct list_head wb_list, /* Defines state of page: */
|
|
*wb_list_head; /* read/write/commit */
|
|
struct page *wb_page; /* page to read in/write out */
|
|
struct nfs_open_context *wb_context; /* File state context info */
|
|
atomic_t wb_complete; /* i/os we're waiting for */
|
|
unsigned long wb_index; /* Offset >> PAGE_CACHE_SHIFT */
|
|
unsigned int wb_offset, /* Offset & ~PAGE_CACHE_MASK */
|
|
wb_pgbase, /* Start of page data */
|
|
wb_bytes; /* Length of request */
|
|
atomic_t wb_count; /* reference count */
|
|
unsigned long wb_flags;
|
|
struct nfs_writeverf wb_verf; /* Commit cookie */
|
|
};
|
|
|
|
#define NFS_WBACK_BUSY(req) (test_bit(PG_BUSY,&(req)->wb_flags))
|
|
#define NFS_NEED_COMMIT(req) (test_bit(PG_NEED_COMMIT,&(req)->wb_flags))
|
|
#define NFS_NEED_RESCHED(req) (test_bit(PG_NEED_RESCHED,&(req)->wb_flags))
|
|
|
|
extern struct nfs_page *nfs_create_request(struct nfs_open_context *ctx,
|
|
struct inode *inode,
|
|
struct page *page,
|
|
unsigned int offset,
|
|
unsigned int count);
|
|
extern void nfs_clear_request(struct nfs_page *req);
|
|
extern void nfs_release_request(struct nfs_page *req);
|
|
|
|
|
|
extern int nfs_scan_lock_dirty(struct nfs_inode *nfsi, struct list_head *dst,
|
|
unsigned long idx_start, unsigned int npages);
|
|
extern int nfs_scan_list(struct list_head *, struct list_head *,
|
|
unsigned long, unsigned int);
|
|
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
|
|
*/
|
|
static inline int
|
|
nfs_lock_request_dontget(struct nfs_page *req)
|
|
{
|
|
return !test_and_set_bit(PG_BUSY, &req->wb_flags);
|
|
}
|
|
|
|
/*
|
|
* Lock the page of an asynchronous request
|
|
*/
|
|
static inline int
|
|
nfs_lock_request(struct nfs_page *req)
|
|
{
|
|
if (test_and_set_bit(PG_BUSY, &req->wb_flags))
|
|
return 0;
|
|
atomic_inc(&req->wb_count);
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* nfs_list_add_request - Insert a request into a list
|
|
* @req: request
|
|
* @head: head of list into which to insert the request.
|
|
*/
|
|
static inline void
|
|
nfs_list_add_request(struct nfs_page *req, struct list_head *head)
|
|
{
|
|
list_add_tail(&req->wb_list, head);
|
|
req->wb_list_head = head;
|
|
}
|
|
|
|
|
|
/**
|
|
* nfs_list_remove_request - Remove a request from its wb_list
|
|
* @req: request
|
|
*/
|
|
static inline void
|
|
nfs_list_remove_request(struct nfs_page *req)
|
|
{
|
|
if (list_empty(&req->wb_list))
|
|
return;
|
|
list_del_init(&req->wb_list);
|
|
req->wb_list_head = NULL;
|
|
}
|
|
|
|
static inline int
|
|
nfs_defer_commit(struct nfs_page *req)
|
|
{
|
|
return !test_and_set_bit(PG_NEED_COMMIT, &req->wb_flags);
|
|
}
|
|
|
|
static inline void
|
|
nfs_clear_commit(struct nfs_page *req)
|
|
{
|
|
smp_mb__before_clear_bit();
|
|
clear_bit(PG_NEED_COMMIT, &req->wb_flags);
|
|
smp_mb__after_clear_bit();
|
|
}
|
|
|
|
static inline int
|
|
nfs_defer_reschedule(struct nfs_page *req)
|
|
{
|
|
return !test_and_set_bit(PG_NEED_RESCHED, &req->wb_flags);
|
|
}
|
|
|
|
static inline void
|
|
nfs_clear_reschedule(struct nfs_page *req)
|
|
{
|
|
smp_mb__before_clear_bit();
|
|
clear_bit(PG_NEED_RESCHED, &req->wb_flags);
|
|
smp_mb__after_clear_bit();
|
|
}
|
|
|
|
static inline struct nfs_page *
|
|
nfs_list_entry(struct list_head *head)
|
|
{
|
|
return list_entry(head, struct nfs_page, wb_list);
|
|
}
|
|
|
|
static inline
|
|
loff_t req_offset(struct nfs_page *req)
|
|
{
|
|
return (((loff_t)req->wb_index) << PAGE_CACHE_SHIFT) + req->wb_offset;
|
|
}
|
|
|
|
#endif /* _LINUX_NFS_PAGE_H */
|