2 * linux/include/linux/nfs_page.h
4 * Copyright (C) 2000 Trond Myklebust
6 * NFS page cache wrapper.
9 #ifndef _LINUX_NFS_PAGE_H
10 #define _LINUX_NFS_PAGE_H
13 #include <linux/list.h>
14 #include <linux/pagemap.h>
15 #include <linux/wait.h>
16 #include <linux/sunrpc/auth.h>
17 #include <linux/nfs_xdr.h>
19 #include <linux/kref.h>
22 * Valid flags for a dirty buffer
35 struct list_head wb_list
; /* Defines state of page: */
36 struct page
*wb_page
; /* page to read in/write out */
37 struct nfs_open_context
*wb_context
; /* File state context info */
38 struct nfs_lock_context
*wb_lock_context
; /* lock context info */
39 pgoff_t wb_index
; /* Offset >> PAGE_CACHE_SHIFT */
40 unsigned int wb_offset
, /* Offset & ~PAGE_CACHE_MASK */
41 wb_pgbase
, /* Start of page data */
42 wb_bytes
; /* Length of request */
43 struct kref wb_kref
; /* reference count */
44 unsigned long wb_flags
;
45 struct nfs_writeverf wb_verf
; /* Commit cookie */
48 struct nfs_pageio_descriptor
;
49 struct nfs_pageio_ops
{
50 void (*pg_init
)(struct nfs_pageio_descriptor
*, struct nfs_page
*);
51 bool (*pg_test
)(struct nfs_pageio_descriptor
*, struct nfs_page
*, struct nfs_page
*);
52 int (*pg_doio
)(struct nfs_pageio_descriptor
*);
55 struct nfs_pageio_descriptor
{
56 struct list_head pg_list
;
57 unsigned long pg_bytes_written
;
61 unsigned char pg_moreio
: 1,
64 struct inode
*pg_inode
;
65 const struct nfs_pageio_ops
*pg_ops
;
68 const struct rpc_call_ops
*pg_rpc_callops
;
69 const struct nfs_pgio_completion_ops
*pg_completion_ops
;
70 struct pnfs_layout_segment
*pg_lseg
;
71 struct nfs_direct_req
*pg_dreq
;
74 #define NFS_WBACK_BUSY(req) (test_bit(PG_BUSY,&(req)->wb_flags))
76 extern struct nfs_page
*nfs_create_request(struct nfs_open_context
*ctx
,
81 extern void nfs_release_request(struct nfs_page
*req
);
84 extern void nfs_pageio_init(struct nfs_pageio_descriptor
*desc
,
86 const struct nfs_pageio_ops
*pg_ops
,
87 const struct nfs_pgio_completion_ops
*compl_ops
,
90 extern int nfs_pageio_add_request(struct nfs_pageio_descriptor
*,
92 extern void nfs_pageio_complete(struct nfs_pageio_descriptor
*desc
);
93 extern void nfs_pageio_cond_complete(struct nfs_pageio_descriptor
*, pgoff_t
);
94 extern bool nfs_generic_pg_test(struct nfs_pageio_descriptor
*desc
,
95 struct nfs_page
*prev
,
96 struct nfs_page
*req
);
97 extern int nfs_wait_on_request(struct nfs_page
*);
98 extern void nfs_unlock_request(struct nfs_page
*req
);
99 extern void nfs_unlock_and_release_request(struct nfs_page
*req
);
102 * Lock the page of an asynchronous request
105 nfs_lock_request(struct nfs_page
*req
)
107 return !test_and_set_bit(PG_BUSY
, &req
->wb_flags
);
111 * nfs_list_add_request - Insert a request into a list
113 * @head: head of list into which to insert the request.
116 nfs_list_add_request(struct nfs_page
*req
, struct list_head
*head
)
118 list_add_tail(&req
->wb_list
, head
);
123 * nfs_list_remove_request - Remove a request from its wb_list
127 nfs_list_remove_request(struct nfs_page
*req
)
129 if (list_empty(&req
->wb_list
))
131 list_del_init(&req
->wb_list
);
134 static inline struct nfs_page
*
135 nfs_list_entry(struct list_head
*head
)
137 return list_entry(head
, struct nfs_page
, wb_list
);
141 loff_t
req_offset(struct nfs_page
*req
)
143 return (((loff_t
)req
->wb_index
) << PAGE_CACHE_SHIFT
) + req
->wb_offset
;
146 #endif /* _LINUX_NFS_PAGE_H */