nfs_fha.h revision 249592
1132720Skan/*- 2132720Skan * Copyright (c) 2008 Isilon Inc http://www.isilon.com/ 3132720Skan * 4132720Skan * Redistribution and use in source and binary forms, with or without 5132720Skan * modification, are permitted provided that the following conditions 6132720Skan * are met: 7132720Skan * 1. Redistributions of source code must retain the above copyright 8132720Skan * notice, this list of conditions and the following disclaimer. 9132720Skan * 2. Redistributions in binary form must reproduce the above copyright 10132720Skan * notice, this list of conditions and the following disclaimer in the 11132720Skan * documentation and/or other materials provided with the distribution. 12132720Skan * 13132720Skan * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14132720Skan * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15132720Skan * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16132720Skan * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17132720Skan * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18132720Skan * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19132720Skan * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20169691Skan * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21169691Skan * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22132720Skan * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23132720Skan * SUCH DAMAGE. 24132720Skan */ 25132720Skan/* $FreeBSD: head/sys/nfsserver/nfs_fha.h 249592 2013-04-17 21:00:22Z ken $ */ 26132720Skan 27132720Skan#ifndef _NFS_FHA_H 28132720Skan#define _NFS_FHA_H 1 29132720Skan 30132720Skan#ifdef _KERNEL 31132720Skan 32132720Skan/* Sysctl defaults. */ 33169691Skan#define FHA_DEF_ENABLE 1 34169691Skan#define FHA_DEF_BIN_SHIFT 22 /* 4MB */ 35169691Skan#define FHA_DEF_MAX_NFSDS_PER_FH 8 36132720Skan#define FHA_DEF_MAX_REQS_PER_NFSD 0 /* Unlimited */ 37132720Skan 38132720Skan/* This is the global structure that represents the state of the fha system. */ 39132720Skanstruct fha_global { 40132720Skan struct fha_hash_entry_list *hashtable; 41132720Skan u_long hashmask; 42169691Skan}; 43169691Skan 44169691Skanstruct fha_ctls { 45132720Skan int enable; 46132720Skan uint32_t bin_shift; 47132720Skan uint32_t max_nfsds_per_fh; 48132720Skan uint32_t max_reqs_per_nfsd; 49132720Skan}; 50132720Skan 51132720Skan/* 52132720Skan * These are the entries in the filehandle hash. They talk about a specific 53132720Skan * file, requests against which are being handled by one or more nfsds. We 54132720Skan * keep a chain of nfsds against the file. We only have more than one if reads 55132720Skan * are ongoing, and then only if the reads affect disparate regions of the 56132720Skan * file. 57132720Skan * 58132720Skan * In general, we want to assign a new request to an existing nfsd if it is 59132720Skan * going to contend with work happening already on that nfsd, or if the 60132720Skan * operation is a read and the nfsd is already handling a proximate read. We 61132720Skan * do this to avoid jumping around in the read stream unnecessarily, and to 62132720Skan * avoid contention between threads over single files. 63132720Skan */ 64132720Skanstruct fha_hash_entry { 65132720Skan LIST_ENTRY(fha_hash_entry) link; 66132720Skan u_int64_t fh; 67132720Skan u_int32_t num_rw; 68132720Skan u_int32_t num_exclusive; 69132720Skan u_int8_t num_threads; 70169691Skan struct svcthread_list threads; 71169691Skan}; 72169691Skan 73169691SkanLIST_HEAD(fha_hash_entry_list, fha_hash_entry); 74132720Skan 75132720Skan/* A structure used for passing around data internally. */ 76132720Skanstruct fha_info { 77132720Skan u_int64_t fh; 78169691Skan off_t offset; 79169691Skan int locktype; 80132720Skan}; 81132720Skan 82132720Skanstruct fha_callbacks { 83132720Skan rpcproc_t (*get_procnum)(rpcproc_t procnum); 84132720Skan int (*realign)(struct mbuf **mb, int malloc_flags); 85169691Skan int (*get_fh)(fhandle_t *fh, int v3, struct mbuf **md, caddr_t *dpos); 86169691Skan int (*is_read)(rpcproc_t procnum); 87169691Skan int (*is_write)(rpcproc_t procnum); 88132720Skan int (*get_offset)(struct mbuf **md, caddr_t *dpos, int v3, struct 89132720Skan fha_info *info); 90132720Skan int (*no_offset)(rpcproc_t procnum); 91132720Skan void (*set_locktype)(rpcproc_t procnum, struct fha_info *info); 92132720Skan int (*fhe_stats_sysctl)(SYSCTL_HANDLER_ARGS); 93132720Skan}; 94132720Skan 95169691Skanstruct fha_params { 96132720Skan struct fha_global g_fha; 97132720Skan struct sysctl_ctx_list sysctl_ctx; 98132720Skan struct sysctl_oid *sysctl_tree; 99132720Skan struct fha_ctls ctls; 100132720Skan struct fha_callbacks callbacks; 101132720Skan char server_name[32]; 102132720Skan SVCPOOL **pool; 103132720Skan}; 104132720Skan 105132720Skanvoid fha_nd_complete(SVCTHREAD *, struct svc_req *); 106132720SkanSVCTHREAD *fha_assign(SVCTHREAD *, struct svc_req *, struct fha_params *); 107169691Skanvoid fha_init(struct fha_params *softc); 108132720Skanvoid fha_uninit(struct fha_params *softc); 109132720Skanint fhe_stats_sysctl(SYSCTL_HANDLER_ARGS, struct fha_params *softc); 110169691Skan 111169691Skan#endif /* _KERNEL */ 112169691Skan#endif /* _NFS_FHA_H_ */ 113169691Skan