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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - include/linux/nfs_page.h
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
30 PG_PARTIAL_READ_FAILED
,
36 struct list_head wb_list
; /* Defines state of page: */
37 struct page
*wb_page
; /* page to read in/write out */
38 struct nfs_open_context
*wb_context
; /* File state context info */
39 struct nfs_lock_context
*wb_lock_context
; /* lock context info */
40 atomic_t wb_complete
; /* i/os we're waiting for */
41 pgoff_t wb_index
; /* Offset >> PAGE_CACHE_SHIFT */
42 unsigned int wb_offset
, /* Offset & ~PAGE_CACHE_MASK */
43 wb_pgbase
, /* Start of page data */
44 wb_bytes
; /* Length of request */
45 struct kref wb_kref
; /* reference count */
46 unsigned long wb_flags
;
47 struct nfs_writeverf wb_verf
; /* Commit cookie */
50 struct nfs_pageio_descriptor
;
51 struct nfs_pageio_ops
{
52 void (*pg_init
)(struct nfs_pageio_descriptor
*, struct nfs_page
*);
53 bool (*pg_test
)(struct nfs_pageio_descriptor
*, struct nfs_page
*, struct nfs_page
*);
54 int (*pg_doio
)(struct nfs_pageio_descriptor
*);
57 struct nfs_pageio_descriptor
{
58 struct list_head pg_list
;
59 unsigned long pg_bytes_written
;
63 unsigned char pg_moreio
: 1,
66 struct inode
*pg_inode
;
67 const struct nfs_pageio_ops
*pg_ops
;
70 const struct rpc_call_ops
*pg_rpc_callops
;
71 struct pnfs_layout_segment
*pg_lseg
;
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
,
89 extern int nfs_pageio_add_request(struct nfs_pageio_descriptor
*,
91 extern void nfs_pageio_complete(struct nfs_pageio_descriptor
*desc
);
92 extern void nfs_pageio_cond_complete(struct nfs_pageio_descriptor
*, pgoff_t
);
93 extern bool nfs_generic_pg_test(struct nfs_pageio_descriptor
*desc
,
94 struct nfs_page
*prev
,
95 struct nfs_page
*req
);
96 extern int nfs_wait_on_request(struct nfs_page
*);
97 extern void nfs_unlock_request(struct nfs_page
*req
);
100 * Lock the page of an asynchronous request without getting a new reference
103 nfs_lock_request_dontget(struct nfs_page
*req
)
105 return !test_and_set_bit(PG_BUSY
, &req
->wb_flags
);
109 nfs_lock_request(struct nfs_page
*req
)
111 if (test_and_set_bit(PG_BUSY
, &req
->wb_flags
))
113 kref_get(&req
->wb_kref
);
119 * nfs_list_add_request - Insert a request into a list
121 * @head: head of list into which to insert the request.
124 nfs_list_add_request(struct nfs_page
*req
, struct list_head
*head
)
126 list_add_tail(&req
->wb_list
, head
);
131 * nfs_list_remove_request - Remove a request from its wb_list
135 nfs_list_remove_request(struct nfs_page
*req
)
137 if (list_empty(&req
->wb_list
))
139 list_del_init(&req
->wb_list
);
142 static inline struct nfs_page
*
143 nfs_list_entry(struct list_head
*head
)
145 return list_entry(head
, struct nfs_page
, wb_list
);
149 loff_t
req_offset(struct nfs_page
*req
)
151 return (((loff_t
)req
->wb_index
) << PAGE_CACHE_SHIFT
) + req
->wb_offset
;
154 #endif /* _LINUX_NFS_PAGE_H */