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10#ifndef _LINUX_NFS_PAGE_H
11#define _LINUX_NFS_PAGE_H
12
13
14#include <linux/list.h>
15#include <linux/pagemap.h>
16#include <linux/wait.h>
17#include <linux/sunrpc/auth.h>
18#include <linux/nfs_xdr.h>
19
20#include <linux/kref.h>
21
22
23
24
25enum {
26 PG_BUSY = 0,
27 PG_MAPPED,
28 PG_CLEAN,
29 PG_COMMIT_TO_DS,
30 PG_INODE_REF,
31 PG_HEADLOCK,
32 PG_TEARDOWN,
33 PG_UNLOCKPAGE,
34 PG_UPTODATE,
35 PG_WB_END,
36 PG_REMOVE,
37 PG_CONTENDED1,
38 PG_CONTENDED2,
39};
40
41struct nfs_inode;
42struct nfs_page {
43 struct list_head wb_list;
44 struct page *wb_page;
45 struct nfs_lock_context *wb_lock_context;
46 pgoff_t wb_index;
47 unsigned int wb_offset,
48 wb_pgbase,
49 wb_bytes;
50 struct kref wb_kref;
51 unsigned long wb_flags;
52 struct nfs_write_verifier wb_verf;
53 struct nfs_page *wb_this_page;
54 struct nfs_page *wb_head;
55 unsigned short wb_nio;
56};
57
58struct nfs_pgio_mirror;
59struct nfs_pageio_descriptor;
60struct nfs_pageio_ops {
61 void (*pg_init)(struct nfs_pageio_descriptor *, struct nfs_page *);
62 size_t (*pg_test)(struct nfs_pageio_descriptor *, struct nfs_page *,
63 struct nfs_page *);
64 int (*pg_doio)(struct nfs_pageio_descriptor *);
65 unsigned int (*pg_get_mirror_count)(struct nfs_pageio_descriptor *,
66 struct nfs_page *);
67 void (*pg_cleanup)(struct nfs_pageio_descriptor *);
68 struct nfs_pgio_mirror *
69 (*pg_get_mirror)(struct nfs_pageio_descriptor *, u32);
70 u32 (*pg_set_mirror)(struct nfs_pageio_descriptor *, u32);
71};
72
73struct nfs_rw_ops {
74 struct nfs_pgio_header *(*rw_alloc_header)(void);
75 void (*rw_free_header)(struct nfs_pgio_header *);
76 int (*rw_done)(struct rpc_task *, struct nfs_pgio_header *,
77 struct inode *);
78 void (*rw_result)(struct rpc_task *, struct nfs_pgio_header *);
79 void (*rw_initiate)(struct nfs_pgio_header *, struct rpc_message *,
80 const struct nfs_rpc_ops *,
81 struct rpc_task_setup *, int);
82};
83
84struct nfs_pgio_mirror {
85 struct list_head pg_list;
86 unsigned long pg_bytes_written;
87 size_t pg_count;
88 size_t pg_bsize;
89 unsigned int pg_base;
90 unsigned char pg_recoalesce : 1;
91};
92
93struct nfs_pageio_descriptor {
94 struct inode *pg_inode;
95 const struct nfs_pageio_ops *pg_ops;
96 const struct nfs_rw_ops *pg_rw_ops;
97 int pg_ioflags;
98 int pg_error;
99 const struct rpc_call_ops *pg_rpc_callops;
100 const struct nfs_pgio_completion_ops *pg_completion_ops;
101 struct pnfs_layout_segment *pg_lseg;
102 struct nfs_io_completion *pg_io_completion;
103 struct nfs_direct_req *pg_dreq;
104 unsigned int pg_bsize;
105
106 u32 pg_mirror_count;
107 struct nfs_pgio_mirror *pg_mirrors;
108 struct nfs_pgio_mirror pg_mirrors_static[1];
109 struct nfs_pgio_mirror *pg_mirrors_dynamic;
110 u32 pg_mirror_idx;
111 unsigned short pg_maxretrans;
112 unsigned char pg_moreio : 1;
113};
114
115
116#define NFS_PAGEIO_DESCRIPTOR_MIRROR_MAX 16
117
118#define NFS_WBACK_BUSY(req) (test_bit(PG_BUSY,&(req)->wb_flags))
119
120extern struct nfs_page *nfs_create_request(struct nfs_open_context *ctx,
121 struct page *page,
122 unsigned int offset,
123 unsigned int count);
124extern void nfs_release_request(struct nfs_page *);
125
126
127extern void nfs_pageio_init(struct nfs_pageio_descriptor *desc,
128 struct inode *inode,
129 const struct nfs_pageio_ops *pg_ops,
130 const struct nfs_pgio_completion_ops *compl_ops,
131 const struct nfs_rw_ops *rw_ops,
132 size_t bsize,
133 int how);
134extern int nfs_pageio_add_request(struct nfs_pageio_descriptor *,
135 struct nfs_page *);
136extern int nfs_pageio_resend(struct nfs_pageio_descriptor *,
137 struct nfs_pgio_header *);
138extern void nfs_pageio_complete(struct nfs_pageio_descriptor *desc);
139extern void nfs_pageio_cond_complete(struct nfs_pageio_descriptor *, pgoff_t);
140extern size_t nfs_generic_pg_test(struct nfs_pageio_descriptor *desc,
141 struct nfs_page *prev,
142 struct nfs_page *req);
143extern int nfs_wait_on_request(struct nfs_page *);
144extern void nfs_unlock_request(struct nfs_page *req);
145extern void nfs_unlock_and_release_request(struct nfs_page *);
146extern struct nfs_page *nfs_page_group_lock_head(struct nfs_page *req);
147extern int nfs_page_group_lock_subrequests(struct nfs_page *head);
148extern void nfs_join_page_group(struct nfs_page *head, struct inode *inode);
149extern int nfs_page_group_lock(struct nfs_page *);
150extern void nfs_page_group_unlock(struct nfs_page *);
151extern bool nfs_page_group_sync_on_bit(struct nfs_page *, unsigned int);
152extern int nfs_page_set_headlock(struct nfs_page *req);
153extern void nfs_page_clear_headlock(struct nfs_page *req);
154extern bool nfs_async_iocounter_wait(struct rpc_task *, struct nfs_lock_context *);
155
156
157
158
159static inline int
160nfs_lock_request(struct nfs_page *req)
161{
162 return !test_and_set_bit(PG_BUSY, &req->wb_flags);
163}
164
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168
169
170static inline void
171nfs_list_add_request(struct nfs_page *req, struct list_head *head)
172{
173 list_add_tail(&req->wb_list, head);
174}
175
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179
180
181static inline void
182nfs_list_move_request(struct nfs_page *req, struct list_head *head)
183{
184 list_move_tail(&req->wb_list, head);
185}
186
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189
190
191static inline void
192nfs_list_remove_request(struct nfs_page *req)
193{
194 if (list_empty(&req->wb_list))
195 return;
196 list_del_init(&req->wb_list);
197}
198
199static inline struct nfs_page *
200nfs_list_entry(struct list_head *head)
201{
202 return list_entry(head, struct nfs_page, wb_list);
203}
204
205static inline
206loff_t req_offset(struct nfs_page *req)
207{
208 return (((loff_t)req->wb_index) << PAGE_SHIFT) + req->wb_offset;
209}
210
211static inline struct nfs_open_context *
212nfs_req_openctx(struct nfs_page *req)
213{
214 return req->wb_lock_context->open_context;
215}
216
217#endif
218