nfs_fha.h revision 261061
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: stable/9/sys/nfs/nfs_fha.h 261061 2014-01-23 00:42:08Z mav $ */ 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. */ 39struct fha_global { 40 struct fha_hash_entry_list *hashtable; 41 u_long hashmask; 42}; 43 44struct 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 */ 64struct 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 73LIST_HEAD(fha_hash_entry_list, fha_hash_entry); 74 75/* A structure used for passing around data internally. */ 76struct fha_info { 77 u_int64_t fh; 78 off_t offset; 79 int locktype; 80}; 81 82struct fha_callbacks { 83 rpcproc_t (*get_procnum)(rpcproc_t procnum); 84 int (*realign)(struct mbuf **mb, int malloc_flags); 85 int (*get_fh)(uint64_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 95struct 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 105void fha_nd_complete(SVCTHREAD *, struct svc_req *); 106SVCTHREAD *fha_assign(SVCTHREAD *, struct svc_req *, struct fha_params *); 107void fha_init(struct fha_params *softc); 108void fha_uninit(struct fha_params *softc); 109int fhe_stats_sysctl(SYSCTL_HANDLER_ARGS, struct fha_params *softc); 110 111#endif /* _KERNEL */ 112#endif /* _NFS_FHA_H_ */ 113