nfs_fha.h revision 322137
12116Sjkh/*- 22116Sjkh * Copyright (c) 2008 Isilon Inc http://www.isilon.com/ 32116Sjkh * 42116Sjkh * Redistribution and use in source and binary forms, with or without 52116Sjkh * modification, are permitted provided that the following conditions 62116Sjkh * are met: 78870Srgrimes * 1. Redistributions of source code must retain the above copyright 82116Sjkh * notice, this list of conditions and the following disclaimer. 92116Sjkh * 2. Redistributions in binary form must reproduce the above copyright 102116Sjkh * notice, this list of conditions and the following disclaimer in the 112116Sjkh * documentation and/or other materials provided with the distribution. 122116Sjkh * 132116Sjkh * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1450476Speter * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 152116Sjkh * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 162116Sjkh * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 172116Sjkh * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 1887805Sphantom * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 192116Sjkh * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20130264Sdas * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21110566Smike * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22130713Sstefanf * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23110566Smike * SUCH DAMAGE. 242116Sjkh */ 252116Sjkh/* $FreeBSD: stable/11/sys/nfs/nfs_fha.h 322137 2017-08-07 07:02:51Z mav $ */ 262116Sjkh 27106268Sarchie#ifndef _NFS_FHA_H 28106268Sarchie#define _NFS_FHA_H 1 29106268Sarchie 30106268Sarchie#ifdef _KERNEL 31110566Smike 32110566Smike/* Sysctl defaults. */ 33110566Smike#define FHA_DEF_ENABLE 1 34110566Smike#define FHA_DEF_READ 1 35110566Smike#define FHA_DEF_WRITE 1 36110566Smike#define FHA_DEF_BIN_SHIFT 22 /* 4MB */ 37135360Sdas#define FHA_DEF_MAX_NFSDS_PER_FH 8 38131851Sdas#define FHA_DEF_MAX_REQS_PER_NFSD 0 /* Unlimited */ 39131851Sdas 40131851Sdas#define FHA_HASH_SIZE 251 41135360Sdas 42131851Sdasstruct fha_ctls { 43131851Sdas int enable; 44131851Sdas int read; 45131851Sdas int write; 46131851Sdas uint32_t bin_shift; 47131851Sdas uint32_t max_nfsds_per_fh; 48128628Sdas uint32_t max_reqs_per_nfsd; 49131851Sdas}; 50128628Sdas 51128628Sdas/* 52130713Sstefanf * These are the entries in the filehandle hash. They talk about a specific 53130713Sstefanf * file, requests against which are being handled by one or more nfsds. We 54131851Sdas * keep a chain of nfsds against the file. We only have more than one if reads 55131851Sdas * are ongoing, and then only if the reads affect disparate regions of the 56131851Sdas * file. 57131851Sdas * 58186886Sdas * In general, we want to assign a new request to an existing nfsd if it is 59186886Sdas * going to contend with work happening already on that nfsd, or if the 60131851Sdas * operation is a read and the nfsd is already handling a proximate read. We 61110566Smike * do this to avoid jumping around in the read stream unnecessarily, and to 62110566Smike * avoid contention between threads over single files. 63110566Smike */ 64110566Smikestruct fha_hash_entry { 65131851Sdas struct mtx *mtx; 662116Sjkh LIST_ENTRY(fha_hash_entry) link; 67126871Sbde u_int64_t fh; 68126871Sbde u_int32_t num_rw; 69140265Sdas u_int32_t num_exclusive; 70126871Sbde u_int8_t num_threads; 71226374Sdas struct svcthread_list threads; 72140609Sdas}; 73110566Smike 74110769SmikeLIST_HEAD(fha_hash_entry_list, fha_hash_entry); 75110769Smike 76110769Smikestruct fha_hash_slot { 77110769Smike struct fha_hash_entry_list list; 78110769Smike struct mtx mtx; 79253215Stheraven}; 80369606Sgit2svn 81369606Sgit2svn/* A structure used for passing around data internally. */ 82253319Stheravenstruct fha_info { 83253319Stheraven u_int64_t fh; 84253766Stheraven off_t offset; 85253766Stheraven int locktype; 86253766Stheraven int read; 87253766Stheraven int write; 88253766Stheraven}; 89253766Stheraven 90253766Stheravenstruct fha_callbacks { 91253766Stheraven rpcproc_t (*get_procnum)(rpcproc_t procnum); 92253766Stheraven int (*realign)(struct mbuf **mb, int malloc_flags); 93253766Stheraven int (*get_fh)(uint64_t *fh, int v3, struct mbuf **md, caddr_t *dpos); 94253260Stheraven int (*is_read)(rpcproc_t procnum); 95253319Stheraven int (*is_write)(rpcproc_t procnum); 96253319Stheraven int (*get_offset)(struct mbuf **md, caddr_t *dpos, int v3, struct 97253319Stheraven fha_info *info); 98253319Stheraven int (*no_offset)(rpcproc_t procnum); 99253319Stheraven void (*set_locktype)(rpcproc_t procnum, struct fha_info *info); 100253319Stheraven int (*fhe_stats_sysctl)(SYSCTL_HANDLER_ARGS); 101253215Stheraven}; 102253319Stheraven 103253319Stheravenstruct fha_params { 104253319Stheraven struct fha_hash_slot fha_hash[FHA_HASH_SIZE]; 105253319Stheraven struct sysctl_ctx_list sysctl_ctx; 106253215Stheraven struct sysctl_oid *sysctl_tree; 107253215Stheraven struct fha_ctls ctls; 108110566Smike struct fha_callbacks callbacks; 109253219Stheraven char server_name[32]; 110253215Stheraven SVCPOOL **pool; 111253215Stheraven}; 112253215Stheraven 113253215Stheravenvoid fha_nd_complete(SVCTHREAD *, struct svc_req *); 114253215StheravenSVCTHREAD *fha_assign(SVCTHREAD *, struct svc_req *, struct fha_params *); 115110769Smikevoid fha_init(struct fha_params *softc); 116131851Sdasvoid fha_uninit(struct fha_params *softc); 117131851Sdasint fhe_stats_sysctl(SYSCTL_HANDLER_ARGS, struct fha_params *softc); 118131851Sdas 119131851Sdas#endif /* _KERNEL */ 120131851Sdas#endif /* _NFS_FHA_H_ */ 121131851Sdas