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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> |
16 | #include <linux/sunrpc/auth.h> |
17 | #include <linux/nfs_xdr.h> |
18 | |
19 | #include <linux/kref.h> |
20 | |
21 | /* |
22 | * Valid flags for the radix tree |
23 | */ |
24 | #define NFS_PAGE_TAG_LOCKED 0 |
25 | #define NFS_PAGE_TAG_COMMIT 1 |
26 | |
27 | /* |
28 | * Valid flags for a dirty buffer |
29 | */ |
30 | enum { |
31 | PG_BUSY = 0, |
32 | PG_CLEAN, |
33 | PG_NEED_COMMIT, |
34 | PG_NEED_RESCHED, |
35 | }; |
36 | |
37 | struct nfs_inode; |
38 | struct nfs_page { |
39 | struct list_head wb_list; /* Defines state of page: */ |
40 | struct page *wb_page; /* page to read in/write out */ |
41 | struct nfs_open_context *wb_context; /* File state context info */ |
42 | atomic_t wb_complete; /* i/os we're waiting for */ |
43 | pgoff_t wb_index; /* Offset >> PAGE_CACHE_SHIFT */ |
44 | unsigned int wb_offset, /* Offset & ~PAGE_CACHE_MASK */ |
45 | wb_pgbase, /* Start of page data */ |
46 | wb_bytes; /* Length of request */ |
47 | struct kref wb_kref; /* reference count */ |
48 | unsigned long wb_flags; |
49 | struct nfs_writeverf wb_verf; /* Commit cookie */ |
50 | }; |
51 | |
52 | struct nfs_pageio_descriptor { |
53 | struct list_head pg_list; |
54 | unsigned long pg_bytes_written; |
55 | size_t pg_count; |
56 | size_t pg_bsize; |
57 | unsigned int pg_base; |
58 | |
59 | struct inode *pg_inode; |
60 | int (*pg_doio)(struct inode *, struct list_head *, unsigned int, size_t, int); |
61 | int pg_ioflags; |
62 | int pg_error; |
63 | }; |
64 | |
65 | #define NFS_WBACK_BUSY(req) (test_bit(PG_BUSY,&(req)->wb_flags)) |
66 | |
67 | extern struct nfs_page *nfs_create_request(struct nfs_open_context *ctx, |
68 | struct inode *inode, |
69 | struct page *page, |
70 | unsigned int offset, |
71 | unsigned int count); |
72 | extern void nfs_clear_request(struct nfs_page *req); |
73 | extern void nfs_release_request(struct nfs_page *req); |
74 | |
75 | |
76 | extern int nfs_scan_list(struct nfs_inode *nfsi, struct list_head *dst, |
77 | pgoff_t idx_start, unsigned int npages, int tag); |
78 | extern void nfs_pageio_init(struct nfs_pageio_descriptor *desc, |
79 | struct inode *inode, |
80 | int (*doio)(struct inode *, struct list_head *, unsigned int, size_t, int), |
81 | size_t bsize, |
82 | int how); |
83 | extern int nfs_pageio_add_request(struct nfs_pageio_descriptor *, |
84 | struct nfs_page *); |
85 | extern void nfs_pageio_complete(struct nfs_pageio_descriptor *desc); |
86 | extern void nfs_pageio_cond_complete(struct nfs_pageio_descriptor *, pgoff_t); |
87 | extern int nfs_wait_on_request(struct nfs_page *); |
88 | extern void nfs_unlock_request(struct nfs_page *req); |
89 | extern int nfs_set_page_tag_locked(struct nfs_page *req); |
90 | extern void nfs_clear_page_tag_locked(struct nfs_page *req); |
91 | |
92 | |
93 | /* |
94 | * Lock the page of an asynchronous request without getting a new reference |
95 | */ |
96 | static inline int |
97 | nfs_lock_request_dontget(struct nfs_page *req) |
98 | { |
99 | return !test_and_set_bit(PG_BUSY, &req->wb_flags); |
100 | } |
101 | |
102 | /** |
103 | * nfs_list_add_request - Insert a request into a list |
104 | * @req: request |
105 | * @head: head of list into which to insert the request. |
106 | */ |
107 | static inline void |
108 | nfs_list_add_request(struct nfs_page *req, struct list_head *head) |
109 | { |
110 | list_add_tail(&req->wb_list, head); |
111 | } |
112 | |
113 | |
114 | /** |
115 | * nfs_list_remove_request - Remove a request from its wb_list |
116 | * @req: request |
117 | */ |
118 | static inline void |
119 | nfs_list_remove_request(struct nfs_page *req) |
120 | { |
121 | if (list_empty(&req->wb_list)) |
122 | return; |
123 | list_del_init(&req->wb_list); |
124 | } |
125 | |
126 | static inline struct nfs_page * |
127 | nfs_list_entry(struct list_head *head) |
128 | { |
129 | return list_entry(head, struct nfs_page, wb_list); |
130 | } |
131 | |
132 | static inline |
133 | loff_t req_offset(struct nfs_page *req) |
134 | { |
135 | return (((loff_t)req->wb_index) << PAGE_CACHE_SHIFT) + req->wb_offset; |
136 | } |
137 | |
138 | #endif /* _LINUX_NFS_PAGE_H */ |
139 |
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