1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2008 Isilon Inc http://www.isilon.com/
5 * Copyright (c) 2013 Spectra Logic Corporation
6 *
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29 /* $FreeBSD$ */
30
31 #ifndef _NFS_FHA_NEW_H
32 #define _NFS_FHA_NEW_H 1
33
34 #ifdef _KERNEL
35
36 #define FHANEW_SERVER_NAME "nfsd"
37
38 /* Sysctl defaults. */
39 #define FHA_DEF_ENABLE 1
40 #define FHA_DEF_READ 1
41 #define FHA_DEF_WRITE 1
42 #define FHA_DEF_BIN_SHIFT 22 /* 4MB */
43 #define FHA_DEF_MAX_NFSDS_PER_FH 8
44 #define FHA_DEF_MAX_REQS_PER_NFSD 0 /* Unlimited */
45
46 #define FHA_HASH_SIZE 251
47
48 struct fha_ctls {
49 int enable;
50 int read;
51 int write;
52 uint32_t bin_shift;
53 uint32_t max_nfsds_per_fh;
54 uint32_t max_reqs_per_nfsd;
55 };
56
57 /*
58 * These are the entries in the filehandle hash. They talk about a specific
59 * file, requests against which are being handled by one or more nfsds. We
60 * keep a chain of nfsds against the file. We only have more than one if reads
61 * are ongoing, and then only if the reads affect disparate regions of the
62 * file.
63 *
64 * In general, we want to assign a new request to an existing nfsd if it is
65 * going to contend with work happening already on that nfsd, or if the
66 * operation is a read and the nfsd is already handling a proximate read. We
67 * do this to avoid jumping around in the read stream unnecessarily, and to
68 * avoid contention between threads over single files.
69 */
70 struct fha_hash_entry {
71 struct mtx *mtx;
72 LIST_ENTRY(fha_hash_entry) link;
73 u_int64_t fh;
74 u_int32_t num_rw;
75 u_int32_t num_exclusive;
76 u_int8_t num_threads;
77 struct svcthread_list threads;
78 };
79
80 LIST_HEAD(fha_hash_entry_list, fha_hash_entry);
81
82 struct fha_hash_slot {
83 struct fha_hash_entry_list list;
84 struct mtx mtx;
85 };
86
87 /* A structure used for passing around data internally. */
88 struct fha_info {
89 u_int64_t fh;
90 off_t offset;
91 int locktype;
92 int read;
93 int write;
94 };
95
96 struct fha_params {
97 struct fha_hash_slot fha_hash[FHA_HASH_SIZE];
98 struct sysctl_ctx_list sysctl_ctx;
99 struct sysctl_oid *sysctl_tree;
100 struct fha_ctls ctls;
101 char server_name[32];
102 SVCPOOL **pool;
103 };
104
105 SVCTHREAD *fhanew_assign(SVCTHREAD *this_thread, struct svc_req *req);
106 void fhanew_nd_complete(SVCTHREAD *, struct svc_req *);
107 #endif /* _KERNEL */
108
109 #endif /* _NFS_FHA_NEW_H */
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