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Commit | Line | Data |
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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 | */ | |
e468bae9 TM |
30 | enum { |
31 | PG_BUSY = 0, | |
2df485a7 | 32 | PG_MAPPED, |
e468bae9 TM |
33 | PG_CLEAN, |
34 | PG_NEED_COMMIT, | |
35 | PG_NEED_RESCHED, | |
a861a1e1 | 36 | PG_PNFS_COMMIT, |
e468bae9 | 37 | }; |
1da177e4 | 38 | |
3da28eb1 | 39 | struct nfs_inode; |
1da177e4 | 40 | struct nfs_page { |
a861a1e1 FI |
41 | union { |
42 | struct list_head wb_list; /* Defines state of page: */ | |
43 | struct pnfs_layout_segment *wb_commit_lseg; /* Used when PG_PNFS_COMMIT set */ | |
44 | }; | |
1da177e4 LT |
45 | struct page *wb_page; /* page to read in/write out */ |
46 | struct nfs_open_context *wb_context; /* File state context info */ | |
f11ac8db | 47 | struct nfs_lock_context *wb_lock_context; /* lock context info */ |
1da177e4 | 48 | atomic_t wb_complete; /* i/os we're waiting for */ |
ca52fec1 | 49 | pgoff_t wb_index; /* Offset >> PAGE_CACHE_SHIFT */ |
1da177e4 LT |
50 | unsigned int wb_offset, /* Offset & ~PAGE_CACHE_MASK */ |
51 | wb_pgbase, /* Start of page data */ | |
52 | wb_bytes; /* Length of request */ | |
c03b4024 | 53 | struct kref wb_kref; /* reference count */ |
1da177e4 LT |
54 | unsigned long wb_flags; |
55 | struct nfs_writeverf wb_verf; /* Commit cookie */ | |
56 | }; | |
57 | ||
1751c363 TM |
58 | struct nfs_pageio_descriptor; |
59 | struct nfs_pageio_ops { | |
60 | bool (*pg_test)(struct nfs_pageio_descriptor *, struct nfs_page *, struct nfs_page *); | |
61 | int (*pg_doio)(struct nfs_pageio_descriptor *); | |
62 | }; | |
63 | ||
d8a5ad75 TM |
64 | struct nfs_pageio_descriptor { |
65 | struct list_head pg_list; | |
bcb71bba | 66 | unsigned long pg_bytes_written; |
d8a5ad75 TM |
67 | size_t pg_count; |
68 | size_t pg_bsize; | |
69 | unsigned int pg_base; | |
b31268ac | 70 | char pg_moreio; |
bcb71bba TM |
71 | |
72 | struct inode *pg_inode; | |
1751c363 | 73 | const struct nfs_pageio_ops *pg_ops; |
bcb71bba TM |
74 | int pg_ioflags; |
75 | int pg_error; | |
94ad1c80 | 76 | struct pnfs_layout_segment *pg_lseg; |
d8a5ad75 TM |
77 | }; |
78 | ||
1da177e4 | 79 | #define NFS_WBACK_BUSY(req) (test_bit(PG_BUSY,&(req)->wb_flags)) |
1da177e4 LT |
80 | |
81 | extern struct nfs_page *nfs_create_request(struct nfs_open_context *ctx, | |
82 | struct inode *inode, | |
83 | struct page *page, | |
84 | unsigned int offset, | |
85 | unsigned int count); | |
1da177e4 LT |
86 | extern void nfs_release_request(struct nfs_page *req); |
87 | ||
88 | ||
5c369683 TM |
89 | extern int nfs_scan_list(struct nfs_inode *nfsi, struct list_head *dst, |
90 | pgoff_t idx_start, unsigned int npages, int tag); | |
bcb71bba TM |
91 | extern void nfs_pageio_init(struct nfs_pageio_descriptor *desc, |
92 | struct inode *inode, | |
1751c363 | 93 | const struct nfs_pageio_ops *pg_ops, |
bcb71bba TM |
94 | size_t bsize, |
95 | int how); | |
8b09bee3 TM |
96 | extern int nfs_pageio_add_request(struct nfs_pageio_descriptor *, |
97 | struct nfs_page *); | |
bcb71bba | 98 | extern void nfs_pageio_complete(struct nfs_pageio_descriptor *desc); |
7fe7f848 | 99 | extern void nfs_pageio_cond_complete(struct nfs_pageio_descriptor *, pgoff_t); |
19345cb2 BH |
100 | extern bool nfs_generic_pg_test(struct nfs_pageio_descriptor *desc, |
101 | struct nfs_page *prev, | |
102 | struct nfs_page *req); | |
1da177e4 LT |
103 | extern int nfs_wait_on_request(struct nfs_page *); |
104 | extern void nfs_unlock_request(struct nfs_page *req); | |
acee478a | 105 | extern int nfs_set_page_tag_locked(struct nfs_page *req); |
9fd367f0 | 106 | extern void nfs_clear_page_tag_locked(struct nfs_page *req); |
c6a556b8 | 107 | |
1751c363 TM |
108 | extern int nfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc); |
109 | extern int nfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc); | |
110 | ||
1da177e4 LT |
111 | |
112 | /* | |
c03b4024 | 113 | * Lock the page of an asynchronous request without getting a new reference |
1da177e4 LT |
114 | */ |
115 | static inline int | |
116 | nfs_lock_request_dontget(struct nfs_page *req) | |
117 | { | |
a911fd9a | 118 | return !test_and_set_bit(PG_BUSY, &req->wb_flags); |
1da177e4 LT |
119 | } |
120 | ||
3da28eb1 TM |
121 | /** |
122 | * nfs_list_add_request - Insert a request into a list | |
123 | * @req: request | |
124 | * @head: head of list into which to insert the request. | |
125 | */ | |
126 | static inline void | |
127 | nfs_list_add_request(struct nfs_page *req, struct list_head *head) | |
128 | { | |
129 | list_add_tail(&req->wb_list, head); | |
3da28eb1 TM |
130 | } |
131 | ||
1da177e4 LT |
132 | |
133 | /** | |
134 | * nfs_list_remove_request - Remove a request from its wb_list | |
135 | * @req: request | |
136 | */ | |
137 | static inline void | |
138 | nfs_list_remove_request(struct nfs_page *req) | |
139 | { | |
140 | if (list_empty(&req->wb_list)) | |
141 | return; | |
1da177e4 | 142 | list_del_init(&req->wb_list); |
1da177e4 LT |
143 | } |
144 | ||
1da177e4 LT |
145 | static inline struct nfs_page * |
146 | nfs_list_entry(struct list_head *head) | |
147 | { | |
148 | return list_entry(head, struct nfs_page, wb_list); | |
149 | } | |
150 | ||
151 | static inline | |
152 | loff_t req_offset(struct nfs_page *req) | |
153 | { | |
154 | return (((loff_t)req->wb_index) << PAGE_CACHE_SHIFT) + req->wb_offset; | |
155 | } | |
156 | ||
157 | #endif /* _LINUX_NFS_PAGE_H */ |