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 LT |
20 | |
21 | /* | |
22 | * Valid flags for a dirty buffer | |
23 | */ | |
e468bae9 | 24 | enum { |
12c05792 WAA |
25 | PG_BUSY = 0, /* nfs_{un}lock_request */ |
26 | PG_MAPPED, /* page private set for buffered io */ | |
27 | PG_CLEAN, /* write succeeded */ | |
28 | PG_COMMIT_TO_DS, /* used by pnfs layouts */ | |
b412ddf0 | 29 | PG_INODE_REF, /* extra ref held by inode when in writeback */ |
2bfc6e56 WAA |
30 | PG_HEADLOCK, /* page group lock of wb_head */ |
31 | PG_TEARDOWN, /* page group sync for destroy */ | |
67d0338e WAA |
32 | PG_UNLOCKPAGE, /* page group sync bit in read path */ |
33 | PG_UPTODATE, /* page group sync bit in read path */ | |
20633f04 WAA |
34 | PG_WB_END, /* page group sync bit in write path */ |
35 | PG_REMOVE, /* page group sync bit in write path */ | |
e468bae9 | 36 | }; |
1da177e4 | 37 | |
3da28eb1 | 38 | struct nfs_inode; |
1da177e4 | 39 | struct nfs_page { |
d6d6dc7c | 40 | struct list_head wb_list; /* Defines state of page: */ |
1da177e4 LT |
41 | struct page *wb_page; /* page to read in/write out */ |
42 | struct nfs_open_context *wb_context; /* File state context info */ | |
f11ac8db | 43 | struct nfs_lock_context *wb_lock_context; /* lock context info */ |
ea1754a0 KS |
44 | pgoff_t wb_index; /* Offset >> PAGE_SHIFT */ |
45 | unsigned int wb_offset, /* Offset & ~PAGE_MASK */ | |
1da177e4 LT |
46 | wb_pgbase, /* Start of page data */ |
47 | wb_bytes; /* Length of request */ | |
c03b4024 | 48 | struct kref wb_kref; /* reference count */ |
1da177e4 | 49 | unsigned long wb_flags; |
2f2c63bc | 50 | struct nfs_write_verifier wb_verf; /* Commit cookie */ |
2bfc6e56 WAA |
51 | struct nfs_page *wb_this_page; /* list of reqs for this page */ |
52 | struct nfs_page *wb_head; /* head pointer for req list */ | |
1da177e4 LT |
53 | }; |
54 | ||
1751c363 TM |
55 | struct nfs_pageio_descriptor; |
56 | struct nfs_pageio_ops { | |
d8007d4d | 57 | void (*pg_init)(struct nfs_pageio_descriptor *, struct nfs_page *); |
b4fdac1a WAA |
58 | size_t (*pg_test)(struct nfs_pageio_descriptor *, struct nfs_page *, |
59 | struct nfs_page *); | |
1751c363 | 60 | int (*pg_doio)(struct nfs_pageio_descriptor *); |
a7d42ddb WAA |
61 | unsigned int (*pg_get_mirror_count)(struct nfs_pageio_descriptor *, |
62 | struct nfs_page *); | |
2176bf42 | 63 | void (*pg_cleanup)(struct nfs_pageio_descriptor *); |
1751c363 TM |
64 | }; |
65 | ||
4a0de55c | 66 | struct nfs_rw_ops { |
a4cdda59 | 67 | const fmode_t rw_mode; |
1e7f3a48 WAA |
68 | struct nfs_pgio_header *(*rw_alloc_header)(void); |
69 | void (*rw_free_header)(struct nfs_pgio_header *); | |
d45f60c6 WAA |
70 | int (*rw_done)(struct rpc_task *, struct nfs_pgio_header *, |
71 | struct inode *); | |
72 | void (*rw_result)(struct rpc_task *, struct nfs_pgio_header *); | |
73 | void (*rw_initiate)(struct nfs_pgio_header *, struct rpc_message *, | |
abde71f4 | 74 | const struct nfs_rpc_ops *, |
1ed26f33 | 75 | struct rpc_task_setup *, int); |
4a0de55c AS |
76 | }; |
77 | ||
a7d42ddb | 78 | struct nfs_pgio_mirror { |
d8a5ad75 | 79 | struct list_head pg_list; |
bcb71bba | 80 | unsigned long pg_bytes_written; |
d8a5ad75 TM |
81 | size_t pg_count; |
82 | size_t pg_bsize; | |
83 | unsigned int pg_base; | |
a7d42ddb WAA |
84 | unsigned char pg_recoalesce : 1; |
85 | }; | |
bcb71bba | 86 | |
a7d42ddb WAA |
87 | struct nfs_pageio_descriptor { |
88 | unsigned char pg_moreio : 1; | |
bcb71bba | 89 | struct inode *pg_inode; |
1751c363 | 90 | const struct nfs_pageio_ops *pg_ops; |
4a0de55c | 91 | const struct nfs_rw_ops *pg_rw_ops; |
bcb71bba TM |
92 | int pg_ioflags; |
93 | int pg_error; | |
50828d7e | 94 | const struct rpc_call_ops *pg_rpc_callops; |
061ae2ed | 95 | const struct nfs_pgio_completion_ops *pg_completion_ops; |
94ad1c80 | 96 | struct pnfs_layout_segment *pg_lseg; |
584aa810 | 97 | struct nfs_direct_req *pg_dreq; |
f6166384 | 98 | void *pg_layout_private; |
a7d42ddb WAA |
99 | unsigned int pg_bsize; /* default bsize for mirrors */ |
100 | ||
101 | u32 pg_mirror_count; | |
102 | struct nfs_pgio_mirror *pg_mirrors; | |
103 | struct nfs_pgio_mirror pg_mirrors_static[1]; | |
104 | struct nfs_pgio_mirror *pg_mirrors_dynamic; | |
105 | u32 pg_mirror_idx; /* current mirror */ | |
d8a5ad75 TM |
106 | }; |
107 | ||
a7d42ddb WAA |
108 | /* arbitrarily selected limit to number of mirrors */ |
109 | #define NFS_PAGEIO_DESCRIPTOR_MIRROR_MAX 16 | |
110 | ||
1da177e4 | 111 | #define NFS_WBACK_BUSY(req) (test_bit(PG_BUSY,&(req)->wb_flags)) |
1da177e4 LT |
112 | |
113 | extern struct nfs_page *nfs_create_request(struct nfs_open_context *ctx, | |
1da177e4 | 114 | struct page *page, |
2bfc6e56 | 115 | struct nfs_page *last, |
1da177e4 LT |
116 | unsigned int offset, |
117 | unsigned int count); | |
2bfc6e56 | 118 | extern void nfs_release_request(struct nfs_page *); |
1da177e4 LT |
119 | |
120 | ||
bcb71bba TM |
121 | extern void nfs_pageio_init(struct nfs_pageio_descriptor *desc, |
122 | struct inode *inode, | |
1751c363 | 123 | const struct nfs_pageio_ops *pg_ops, |
061ae2ed | 124 | const struct nfs_pgio_completion_ops *compl_ops, |
4a0de55c | 125 | const struct nfs_rw_ops *rw_ops, |
bcb71bba TM |
126 | size_t bsize, |
127 | int how); | |
8b09bee3 TM |
128 | extern int nfs_pageio_add_request(struct nfs_pageio_descriptor *, |
129 | struct nfs_page *); | |
53113ad3 WAA |
130 | extern int nfs_pageio_resend(struct nfs_pageio_descriptor *, |
131 | struct nfs_pgio_header *); | |
bcb71bba | 132 | extern void nfs_pageio_complete(struct nfs_pageio_descriptor *desc); |
7fe7f848 | 133 | extern void nfs_pageio_cond_complete(struct nfs_pageio_descriptor *, pgoff_t); |
b4fdac1a | 134 | extern size_t nfs_generic_pg_test(struct nfs_pageio_descriptor *desc, |
19345cb2 BH |
135 | struct nfs_page *prev, |
136 | struct nfs_page *req); | |
1da177e4 LT |
137 | extern int nfs_wait_on_request(struct nfs_page *); |
138 | extern void nfs_unlock_request(struct nfs_page *req); | |
2bfc6e56 | 139 | extern void nfs_unlock_and_release_request(struct nfs_page *); |
e7029206 | 140 | extern int nfs_page_group_lock(struct nfs_page *, bool); |
7c3af975 | 141 | extern void nfs_page_group_lock_wait(struct nfs_page *); |
2bfc6e56 WAA |
142 | extern void nfs_page_group_unlock(struct nfs_page *); |
143 | extern bool nfs_page_group_sync_on_bit(struct nfs_page *, unsigned int); | |
c6a556b8 | 144 | |
1da177e4 | 145 | /* |
7ad84aa9 | 146 | * Lock the page of an asynchronous request |
1da177e4 | 147 | */ |
8dd37758 TM |
148 | static inline int |
149 | nfs_lock_request(struct nfs_page *req) | |
150 | { | |
7ad84aa9 | 151 | return !test_and_set_bit(PG_BUSY, &req->wb_flags); |
8dd37758 TM |
152 | } |
153 | ||
3da28eb1 TM |
154 | /** |
155 | * nfs_list_add_request - Insert a request into a list | |
156 | * @req: request | |
157 | * @head: head of list into which to insert the request. | |
158 | */ | |
159 | static inline void | |
160 | nfs_list_add_request(struct nfs_page *req, struct list_head *head) | |
161 | { | |
162 | list_add_tail(&req->wb_list, head); | |
3da28eb1 TM |
163 | } |
164 | ||
1da177e4 LT |
165 | |
166 | /** | |
167 | * nfs_list_remove_request - Remove a request from its wb_list | |
168 | * @req: request | |
169 | */ | |
170 | static inline void | |
171 | nfs_list_remove_request(struct nfs_page *req) | |
172 | { | |
173 | if (list_empty(&req->wb_list)) | |
174 | return; | |
1da177e4 | 175 | list_del_init(&req->wb_list); |
1da177e4 LT |
176 | } |
177 | ||
1da177e4 LT |
178 | static inline struct nfs_page * |
179 | nfs_list_entry(struct list_head *head) | |
180 | { | |
181 | return list_entry(head, struct nfs_page, wb_list); | |
182 | } | |
183 | ||
184 | static inline | |
185 | loff_t req_offset(struct nfs_page *req) | |
186 | { | |
09cbfeaf | 187 | return (((loff_t)req->wb_index) << PAGE_SHIFT) + req->wb_offset; |
1da177e4 LT |
188 | } |
189 | ||
190 | #endif /* _LINUX_NFS_PAGE_H */ |