blob: 3c60685d972b595a5be6366328276a9c5a1cbcdb [file] [log] [blame]
* linux/include/linux/nfs_page.h
* Copyright (C) 2000 Trond Myklebust
* NFS page cache wrapper.
#include <linux/list.h>
#include <linux/pagemap.h>
#include <linux/wait.h>
#include <linux/sunrpc/auth.h>
#include <linux/nfs_xdr.h>
#include <linux/kref.h>
* Valid flags for the radix tree
* Valid flags for a dirty buffer
enum {
PG_BUSY = 0,
struct nfs_inode;
struct nfs_page {
struct list_head wb_list; /* Defines state of page: */
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 */
pgoff_t 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 */
struct kref wb_kref; /* reference count */
unsigned long wb_flags;
struct nfs_writeverf wb_verf; /* Commit cookie */
struct nfs_pageio_descriptor {
struct list_head pg_list;
unsigned long pg_bytes_written;
size_t pg_count;
size_t pg_bsize;
unsigned int pg_base;
struct inode *pg_inode;
int (*pg_doio)(struct inode *, struct list_head *, unsigned int, size_t, int);
int pg_ioflags;
int pg_error;
#define NFS_WBACK_BUSY(req) (test_bit(PG_BUSY,&(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_list(struct nfs_inode *nfsi, struct list_head *dst,
pgoff_t idx_start, unsigned int npages, int tag);
extern void nfs_pageio_init(struct nfs_pageio_descriptor *desc,
struct inode *inode,
int (*doio)(struct inode *, struct list_head *, unsigned int, size_t, int),
size_t bsize,
int how);
extern int nfs_pageio_add_request(struct nfs_pageio_descriptor *,
struct nfs_page *);
extern void nfs_pageio_complete(struct nfs_pageio_descriptor *desc);
extern void nfs_pageio_cond_complete(struct nfs_pageio_descriptor *, pgoff_t);
extern int nfs_wait_on_request(struct nfs_page *);
extern void nfs_unlock_request(struct nfs_page *req);
extern int nfs_set_page_tag_locked(struct nfs_page *req);
extern void nfs_clear_page_tag_locked(struct nfs_page *req);
* Lock the page of an asynchronous request without getting a new reference
static inline int
nfs_lock_request_dontget(struct nfs_page *req)
return !test_and_set_bit(PG_BUSY, &req->wb_flags);
* 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);
* 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))
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 */