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1da177e4 LT |
1 | /* |
2 | * linux/include/linux/nfs_page.h | |
3 | * | |
4 | * Copyright (C) 2000 Trond Myklebust | |
5 | * | |
6 | * NFS page cache wrapper. | |
7 | */ | |
8 | ||
9 | #ifndef _LINUX_NFS_PAGE_H | |
10 | #define _LINUX_NFS_PAGE_H | |
11 | ||
12 | ||
13 | #include <linux/list.h> | |
14 | #include <linux/pagemap.h> | |
15 | #include <linux/wait.h> | |
1da177e4 LT |
16 | #include <linux/sunrpc/auth.h> |
17 | #include <linux/nfs_xdr.h> | |
18 | ||
c03b4024 | 19 | #include <linux/kref.h> |
1da177e4 | 20 | |
c6a556b8 TM |
21 | /* |
22 | * Valid flags for the radix tree | |
23 | */ | |
9fd367f0 | 24 | #define NFS_PAGE_TAG_LOCKED 0 |
5c369683 | 25 | #define NFS_PAGE_TAG_COMMIT 1 |
c6a556b8 | 26 | |
1da177e4 LT |
27 | /* |
28 | * Valid flags for a dirty buffer | |
29 | */ | |
30 | #define PG_BUSY 0 | |
31 | #define PG_NEED_COMMIT 1 | |
32 | #define PG_NEED_RESCHED 2 | |
33 | ||
3da28eb1 | 34 | struct nfs_inode; |
1da177e4 | 35 | struct nfs_page { |
2aefa104 | 36 | struct list_head wb_list; /* Defines state of page: */ |
1da177e4 LT |
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 */ | |
ca52fec1 | 40 | pgoff_t wb_index; /* Offset >> PAGE_CACHE_SHIFT */ |
1da177e4 LT |
41 | unsigned int wb_offset, /* Offset & ~PAGE_CACHE_MASK */ |
42 | wb_pgbase, /* Start of page data */ | |
43 | wb_bytes; /* Length of request */ | |
c03b4024 | 44 | struct kref wb_kref; /* reference count */ |
1da177e4 LT |
45 | unsigned long wb_flags; |
46 | struct nfs_writeverf wb_verf; /* Commit cookie */ | |
47 | }; | |
48 | ||
d8a5ad75 TM |
49 | struct nfs_pageio_descriptor { |
50 | struct list_head pg_list; | |
bcb71bba | 51 | unsigned long pg_bytes_written; |
d8a5ad75 TM |
52 | size_t pg_count; |
53 | size_t pg_bsize; | |
54 | unsigned int pg_base; | |
bcb71bba TM |
55 | |
56 | struct inode *pg_inode; | |
8d5658c9 | 57 | int (*pg_doio)(struct inode *, struct list_head *, unsigned int, size_t, int); |
bcb71bba TM |
58 | int pg_ioflags; |
59 | int pg_error; | |
d8a5ad75 TM |
60 | }; |
61 | ||
1da177e4 | 62 | #define NFS_WBACK_BUSY(req) (test_bit(PG_BUSY,&(req)->wb_flags)) |
1da177e4 LT |
63 | |
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); | |
71 | ||
72 | ||
5c369683 TM |
73 | extern int nfs_scan_list(struct nfs_inode *nfsi, struct list_head *dst, |
74 | pgoff_t idx_start, unsigned int npages, int tag); | |
bcb71bba TM |
75 | extern void nfs_pageio_init(struct nfs_pageio_descriptor *desc, |
76 | struct inode *inode, | |
8d5658c9 | 77 | int (*doio)(struct inode *, struct list_head *, unsigned int, size_t, int), |
bcb71bba TM |
78 | size_t bsize, |
79 | int how); | |
8b09bee3 TM |
80 | extern int nfs_pageio_add_request(struct nfs_pageio_descriptor *, |
81 | struct nfs_page *); | |
bcb71bba | 82 | extern void nfs_pageio_complete(struct nfs_pageio_descriptor *desc); |
7fe7f848 | 83 | extern void nfs_pageio_cond_complete(struct nfs_pageio_descriptor *, pgoff_t); |
1da177e4 LT |
84 | extern int nfs_wait_on_request(struct nfs_page *); |
85 | extern void nfs_unlock_request(struct nfs_page *req); | |
acee478a | 86 | extern int nfs_set_page_tag_locked(struct nfs_page *req); |
9fd367f0 | 87 | extern void nfs_clear_page_tag_locked(struct nfs_page *req); |
c6a556b8 | 88 | |
1da177e4 LT |
89 | |
90 | /* | |
c03b4024 | 91 | * Lock the page of an asynchronous request without getting a new reference |
1da177e4 LT |
92 | */ |
93 | static inline int | |
94 | nfs_lock_request_dontget(struct nfs_page *req) | |
95 | { | |
a911fd9a | 96 | return !test_and_set_bit(PG_BUSY, &req->wb_flags); |
1da177e4 LT |
97 | } |
98 | ||
3da28eb1 TM |
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. | |
103 | */ | |
104 | static inline void | |
105 | nfs_list_add_request(struct nfs_page *req, struct list_head *head) | |
106 | { | |
107 | list_add_tail(&req->wb_list, head); | |
3da28eb1 TM |
108 | } |
109 | ||
1da177e4 LT |
110 | |
111 | /** | |
112 | * nfs_list_remove_request - Remove a request from its wb_list | |
113 | * @req: request | |
114 | */ | |
115 | static inline void | |
116 | nfs_list_remove_request(struct nfs_page *req) | |
117 | { | |
118 | if (list_empty(&req->wb_list)) | |
119 | return; | |
1da177e4 | 120 | list_del_init(&req->wb_list); |
1da177e4 LT |
121 | } |
122 | ||
1da177e4 LT |
123 | static inline struct nfs_page * |
124 | nfs_list_entry(struct list_head *head) | |
125 | { | |
126 | return list_entry(head, struct nfs_page, wb_list); | |
127 | } | |
128 | ||
129 | static inline | |
130 | loff_t req_offset(struct nfs_page *req) | |
131 | { | |
132 | return (((loff_t)req->wb_index) << PAGE_CACHE_SHIFT) + req->wb_offset; | |
133 | } | |
134 | ||
135 | #endif /* _LINUX_NFS_PAGE_H */ |