1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 30 #ifndef _NFS_FHA_NEW_H 31 #define _NFS_FHA_NEW_H 1 32 33 #ifdef _KERNEL 34 35 #define FHANEW_SERVER_NAME "nfsd" 36 37 /* Sysctl defaults. */ 38 #define FHA_DEF_ENABLE 1 39 #define FHA_DEF_READ 1 40 #define FHA_DEF_WRITE 1 41 #define FHA_DEF_BIN_SHIFT 22 /* 4MB */ 42 #define FHA_DEF_MAX_NFSDS_PER_FH 8 43 #define FHA_DEF_MAX_REQS_PER_NFSD 0 /* Unlimited */ 44 45 #define FHA_HASH_SIZE 251 46 47 struct fha_ctls { 48 int enable; 49 int read; 50 int write; 51 uint32_t bin_shift; 52 uint32_t max_nfsds_per_fh; 53 uint32_t max_reqs_per_nfsd; 54 }; 55 56 /* 57 * These are the entries in the filehandle hash. They talk about a specific 58 * file, requests against which are being handled by one or more nfsds. We 59 * keep a chain of nfsds against the file. We only have more than one if reads 60 * are ongoing, and then only if the reads affect disparate regions of the 61 * file. 62 * 63 * In general, we want to assign a new request to an existing nfsd if it is 64 * going to contend with work happening already on that nfsd, or if the 65 * operation is a read and the nfsd is already handling a proximate read. We 66 * do this to avoid jumping around in the read stream unnecessarily, and to 67 * avoid contention between threads over single files. 68 */ 69 struct fha_hash_entry { 70 struct mtx *mtx; 71 LIST_ENTRY(fha_hash_entry) link; 72 u_int64_t fh; 73 u_int32_t num_rw; 74 u_int32_t num_exclusive; 75 u_int8_t num_threads; 76 struct svcthread_list threads; 77 }; 78 79 LIST_HEAD(fha_hash_entry_list, fha_hash_entry); 80 81 struct fha_hash_slot { 82 struct fha_hash_entry_list list; 83 struct mtx mtx; 84 }; 85 86 /* A structure used for passing around data internally. */ 87 struct fha_info { 88 u_int64_t fh; 89 off_t offset; 90 int locktype; 91 int read; 92 int write; 93 }; 94 95 struct fha_params { 96 struct fha_hash_slot fha_hash[FHA_HASH_SIZE]; 97 char server_name[32]; 98 }; 99 100 SVCTHREAD *fhanew_assign(SVCTHREAD *this_thread, struct svc_req *req); 101 void fhanew_nd_complete(SVCTHREAD *, struct svc_req *); 102 #endif /* _KERNEL */ 103 104 #endif /* _NFS_FHA_NEW_H */ 105