FreeBSD/Linux Kernel Cross Reference
sys/nfs/nfs_fha.h
1 /*-
2 * Copyright (c) 2008 Isilon Inc http://www.isilon.com/
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 */
25 /* $FreeBSD: releng/10.0/sys/nfs/nfs_fha.h 249596 2013-04-17 22:42:43Z ken $ */
26
27 #ifndef _NFS_FHA_H
28 #define _NFS_FHA_H 1
29
30 #ifdef _KERNEL
31
32 /* Sysctl defaults. */
33 #define FHA_DEF_ENABLE 1
34 #define FHA_DEF_BIN_SHIFT 22 /* 4MB */
35 #define FHA_DEF_MAX_NFSDS_PER_FH 8
36 #define FHA_DEF_MAX_REQS_PER_NFSD 0 /* Unlimited */
37
38 /* This is the global structure that represents the state of the fha system. */
39 struct fha_global {
40 struct fha_hash_entry_list *hashtable;
41 u_long hashmask;
42 };
43
44 struct fha_ctls {
45 int enable;
46 uint32_t bin_shift;
47 uint32_t max_nfsds_per_fh;
48 uint32_t max_reqs_per_nfsd;
49 };
50
51 /*
52 * These are the entries in the filehandle hash. They talk about a specific
53 * file, requests against which are being handled by one or more nfsds. We
54 * keep a chain of nfsds against the file. We only have more than one if reads
55 * are ongoing, and then only if the reads affect disparate regions of the
56 * file.
57 *
58 * In general, we want to assign a new request to an existing nfsd if it is
59 * going to contend with work happening already on that nfsd, or if the
60 * operation is a read and the nfsd is already handling a proximate read. We
61 * do this to avoid jumping around in the read stream unnecessarily, and to
62 * avoid contention between threads over single files.
63 */
64 struct fha_hash_entry {
65 LIST_ENTRY(fha_hash_entry) link;
66 u_int64_t fh;
67 u_int32_t num_rw;
68 u_int32_t num_exclusive;
69 u_int8_t num_threads;
70 struct svcthread_list threads;
71 };
72
73 LIST_HEAD(fha_hash_entry_list, fha_hash_entry);
74
75 /* A structure used for passing around data internally. */
76 struct fha_info {
77 u_int64_t fh;
78 off_t offset;
79 int locktype;
80 };
81
82 struct fha_callbacks {
83 rpcproc_t (*get_procnum)(rpcproc_t procnum);
84 int (*realign)(struct mbuf **mb, int malloc_flags);
85 int (*get_fh)(fhandle_t *fh, int v3, struct mbuf **md, caddr_t *dpos);
86 int (*is_read)(rpcproc_t procnum);
87 int (*is_write)(rpcproc_t procnum);
88 int (*get_offset)(struct mbuf **md, caddr_t *dpos, int v3, struct
89 fha_info *info);
90 int (*no_offset)(rpcproc_t procnum);
91 void (*set_locktype)(rpcproc_t procnum, struct fha_info *info);
92 int (*fhe_stats_sysctl)(SYSCTL_HANDLER_ARGS);
93 };
94
95 struct fha_params {
96 struct fha_global g_fha;
97 struct sysctl_ctx_list sysctl_ctx;
98 struct sysctl_oid *sysctl_tree;
99 struct fha_ctls ctls;
100 struct fha_callbacks callbacks;
101 char server_name[32];
102 SVCPOOL **pool;
103 };
104
105 void fha_nd_complete(SVCTHREAD *, struct svc_req *);
106 SVCTHREAD *fha_assign(SVCTHREAD *, struct svc_req *, struct fha_params *);
107 void fha_init(struct fha_params *softc);
108 void fha_uninit(struct fha_params *softc);
109 int fhe_stats_sysctl(SYSCTL_HANDLER_ARGS, struct fha_params *softc);
110
111 #endif /* _KERNEL */
112 #endif /* _NFS_FHA_H_ */
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