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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 | ||
19 | #include <asm/atomic.h> | |
20 | ||
c6a556b8 TM |
21 | /* |
22 | * Valid flags for the radix tree | |
23 | */ | |
c63c7b05 | 24 | #define NFS_PAGE_TAG_WRITEBACK 0 |
c6a556b8 | 25 | |
1da177e4 LT |
26 | /* |
27 | * Valid flags for a dirty buffer | |
28 | */ | |
29 | #define PG_BUSY 0 | |
30 | #define PG_NEED_COMMIT 1 | |
31 | #define PG_NEED_RESCHED 2 | |
1a54533e | 32 | #define PG_NEED_FLUSH 3 |
1da177e4 | 33 | |
3da28eb1 | 34 | struct nfs_inode; |
1da177e4 LT |
35 | struct nfs_page { |
36 | struct list_head wb_list, /* Defines state of page: */ | |
37 | *wb_list_head; /* read/write/commit */ | |
38 | struct page *wb_page; /* page to read in/write out */ | |
39 | struct nfs_open_context *wb_context; /* File state context info */ | |
40 | atomic_t wb_complete; /* i/os we're waiting for */ | |
41 | unsigned long 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 | atomic_t wb_count; /* reference count */ | |
46 | unsigned long wb_flags; | |
47 | struct nfs_writeverf wb_verf; /* Commit cookie */ | |
48 | }; | |
49 | ||
d8a5ad75 TM |
50 | struct nfs_pageio_descriptor { |
51 | struct list_head pg_list; | |
bcb71bba | 52 | unsigned long pg_bytes_written; |
d8a5ad75 TM |
53 | size_t pg_count; |
54 | size_t pg_bsize; | |
55 | unsigned int pg_base; | |
bcb71bba TM |
56 | |
57 | struct inode *pg_inode; | |
58 | int (*pg_doio)(struct inode *, struct list_head *, size_t, int); | |
59 | int pg_ioflags; | |
60 | int pg_error; | |
d8a5ad75 TM |
61 | }; |
62 | ||
1da177e4 | 63 | #define NFS_WBACK_BUSY(req) (test_bit(PG_BUSY,&(req)->wb_flags)) |
1da177e4 LT |
64 | |
65 | extern struct nfs_page *nfs_create_request(struct nfs_open_context *ctx, | |
66 | struct inode *inode, | |
67 | struct page *page, | |
68 | unsigned int offset, | |
69 | unsigned int count); | |
70 | extern void nfs_clear_request(struct nfs_page *req); | |
71 | extern void nfs_release_request(struct nfs_page *req); | |
72 | ||
73 | ||
d2ccddf0 TM |
74 | extern int nfs_scan_list(struct nfs_inode *nfsi, struct list_head *head, struct list_head *dst, |
75 | unsigned long idx_start, unsigned int npages); | |
bcb71bba TM |
76 | extern void nfs_pageio_init(struct nfs_pageio_descriptor *desc, |
77 | struct inode *inode, | |
78 | int (*doio)(struct inode *, struct list_head *, size_t, int), | |
79 | size_t bsize, | |
80 | int how); | |
8b09bee3 TM |
81 | extern int nfs_pageio_add_request(struct nfs_pageio_descriptor *, |
82 | struct nfs_page *); | |
bcb71bba | 83 | extern void nfs_pageio_complete(struct nfs_pageio_descriptor *desc); |
1da177e4 LT |
84 | extern int nfs_wait_on_request(struct nfs_page *); |
85 | extern void nfs_unlock_request(struct nfs_page *req); | |
c6a556b8 TM |
86 | extern int nfs_set_page_writeback_locked(struct nfs_page *req); |
87 | extern void nfs_clear_page_writeback(struct nfs_page *req); | |
88 | ||
1da177e4 LT |
89 | |
90 | /* | |
91 | * Lock the page of an asynchronous request without incrementing the wb_count | |
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 | ||
99 | /* | |
100 | * Lock the page of an asynchronous request | |
101 | */ | |
102 | static inline int | |
103 | nfs_lock_request(struct nfs_page *req) | |
104 | { | |
105 | if (test_and_set_bit(PG_BUSY, &req->wb_flags)) | |
106 | return 0; | |
107 | atomic_inc(&req->wb_count); | |
108 | return 1; | |
109 | } | |
110 | ||
3da28eb1 TM |
111 | /** |
112 | * nfs_list_add_request - Insert a request into a list | |
113 | * @req: request | |
114 | * @head: head of list into which to insert the request. | |
115 | */ | |
116 | static inline void | |
117 | nfs_list_add_request(struct nfs_page *req, struct list_head *head) | |
118 | { | |
119 | list_add_tail(&req->wb_list, head); | |
120 | req->wb_list_head = head; | |
121 | } | |
122 | ||
1da177e4 LT |
123 | |
124 | /** | |
125 | * nfs_list_remove_request - Remove a request from its wb_list | |
126 | * @req: request | |
127 | */ | |
128 | static inline void | |
129 | nfs_list_remove_request(struct nfs_page *req) | |
130 | { | |
131 | if (list_empty(&req->wb_list)) | |
132 | return; | |
1da177e4 LT |
133 | list_del_init(&req->wb_list); |
134 | req->wb_list_head = NULL; | |
135 | } | |
136 | ||
1da177e4 LT |
137 | static inline struct nfs_page * |
138 | nfs_list_entry(struct list_head *head) | |
139 | { | |
140 | return list_entry(head, struct nfs_page, wb_list); | |
141 | } | |
142 | ||
143 | static inline | |
144 | loff_t req_offset(struct nfs_page *req) | |
145 | { | |
146 | return (((loff_t)req->wb_index) << PAGE_CACHE_SHIFT) + req->wb_offset; | |
147 | } | |
148 | ||
149 | #endif /* _LINUX_NFS_PAGE_H */ |