ia64/kvm: compilation fix. export account_system_vtime.
[pv_ops_mirror.git] / include / linux / nfs_page.h
bloba1676e19e49170dc41607ae824b5c911c83886c1
1 /*
2 * linux/include/linux/nfs_page.h
4 * Copyright (C) 2000 Trond Myklebust
6 * NFS page cache wrapper.
7 */
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 the radix tree
24 #define NFS_PAGE_TAG_LOCKED 0
25 #define NFS_PAGE_TAG_COMMIT 1
28 * Valid flags for a dirty buffer
30 #define PG_BUSY 0
31 #define PG_NEED_COMMIT 1
32 #define PG_NEED_RESCHED 2
34 struct nfs_inode;
35 struct nfs_page {
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 atomic_t wb_complete; /* i/os we're waiting for */
40 pgoff_t wb_index; /* Offset >> PAGE_CACHE_SHIFT */
41 unsigned int wb_offset, /* Offset & ~PAGE_CACHE_MASK */
42 wb_pgbase, /* Start of page data */
43 wb_bytes; /* Length of request */
44 struct kref wb_kref; /* reference count */
45 unsigned long wb_flags;
46 struct nfs_writeverf wb_verf; /* Commit cookie */
49 struct nfs_pageio_descriptor {
50 struct list_head pg_list;
51 unsigned long pg_bytes_written;
52 size_t pg_count;
53 size_t pg_bsize;
54 unsigned int pg_base;
56 struct inode *pg_inode;
57 int (*pg_doio)(struct inode *, struct list_head *, unsigned int, size_t, int);
58 int pg_ioflags;
59 int pg_error;
62 #define NFS_WBACK_BUSY(req) (test_bit(PG_BUSY,&(req)->wb_flags))
64 extern struct nfs_page *nfs_create_request(struct nfs_open_context *ctx,
65 struct inode *inode,
66 struct page *page,
67 unsigned int offset,
68 unsigned int count);
69 extern void nfs_clear_request(struct nfs_page *req);
70 extern void nfs_release_request(struct nfs_page *req);
73 extern int nfs_scan_list(struct nfs_inode *nfsi, struct list_head *dst,
74 pgoff_t idx_start, unsigned int npages, int tag);
75 extern void nfs_pageio_init(struct nfs_pageio_descriptor *desc,
76 struct inode *inode,
77 int (*doio)(struct inode *, struct list_head *, unsigned int, size_t, int),
78 size_t bsize,
79 int how);
80 extern int nfs_pageio_add_request(struct nfs_pageio_descriptor *,
81 struct nfs_page *);
82 extern void nfs_pageio_complete(struct nfs_pageio_descriptor *desc);
83 extern void nfs_pageio_cond_complete(struct nfs_pageio_descriptor *, pgoff_t);
84 extern int nfs_wait_on_request(struct nfs_page *);
85 extern void nfs_unlock_request(struct nfs_page *req);
86 extern int nfs_set_page_tag_locked(struct nfs_page *req);
87 extern void nfs_clear_page_tag_locked(struct nfs_page *req);
91 * Lock the page of an asynchronous request without getting a new reference
93 static inline int
94 nfs_lock_request_dontget(struct nfs_page *req)
96 return !test_and_set_bit(PG_BUSY, &req->wb_flags);
99 /**
100 * nfs_list_add_request - Insert a request into a list
101 * @req: request
102 * @head: head of list into which to insert the request.
104 static inline void
105 nfs_list_add_request(struct nfs_page *req, struct list_head *head)
107 list_add_tail(&req->wb_list, head);
112 * nfs_list_remove_request - Remove a request from its wb_list
113 * @req: request
115 static inline void
116 nfs_list_remove_request(struct nfs_page *req)
118 if (list_empty(&req->wb_list))
119 return;
120 list_del_init(&req->wb_list);
123 static inline struct nfs_page *
124 nfs_list_entry(struct list_head *head)
126 return list_entry(head, struct nfs_page, wb_list);
129 static inline
130 loff_t req_offset(struct nfs_page *req)
132 return (((loff_t)req->wb_index) << PAGE_CACHE_SHIFT) + req->wb_offset;
135 #endif /* _LINUX_NFS_PAGE_H */