105 lines
3.3 KiB
C
105 lines
3.3 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2008 Isilon Inc http://www.isilon.com/
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* Copyright (c) 2013 Spectra Logic Corporation
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*
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _NFS_FHA_NEW_H
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#define _NFS_FHA_NEW_H 1
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#ifdef _KERNEL
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#define FHANEW_SERVER_NAME "nfsd"
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/* Sysctl defaults. */
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#define FHA_DEF_ENABLE 1
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#define FHA_DEF_READ 1
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#define FHA_DEF_WRITE 1
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#define FHA_DEF_BIN_SHIFT 22 /* 4MB */
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#define FHA_DEF_MAX_NFSDS_PER_FH 8
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#define FHA_DEF_MAX_REQS_PER_NFSD 0 /* Unlimited */
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#define FHA_HASH_SIZE 251
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struct fha_ctls {
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int enable;
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int read;
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int write;
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uint32_t bin_shift;
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uint32_t max_nfsds_per_fh;
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uint32_t max_reqs_per_nfsd;
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};
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/*
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* These are the entries in the filehandle hash. They talk about a specific
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* file, requests against which are being handled by one or more nfsds. We
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* keep a chain of nfsds against the file. We only have more than one if reads
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* are ongoing, and then only if the reads affect disparate regions of the
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* file.
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*
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* In general, we want to assign a new request to an existing nfsd if it is
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* going to contend with work happening already on that nfsd, or if the
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* operation is a read and the nfsd is already handling a proximate read. We
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* do this to avoid jumping around in the read stream unnecessarily, and to
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* avoid contention between threads over single files.
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*/
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struct fha_hash_entry {
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struct mtx *mtx;
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LIST_ENTRY(fha_hash_entry) link;
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u_int64_t fh;
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u_int32_t num_rw;
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u_int32_t num_exclusive;
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u_int8_t num_threads;
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struct svcthread_list threads;
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};
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LIST_HEAD(fha_hash_entry_list, fha_hash_entry);
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struct fha_hash_slot {
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struct fha_hash_entry_list list;
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struct mtx mtx;
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};
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/* A structure used for passing around data internally. */
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struct fha_info {
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u_int64_t fh;
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off_t offset;
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int locktype;
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int read;
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int write;
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};
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struct fha_params {
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struct fha_hash_slot fha_hash[FHA_HASH_SIZE];
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char server_name[32];
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};
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SVCTHREAD *fhanew_assign(SVCTHREAD *this_thread, struct svc_req *req);
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void fhanew_nd_complete(SVCTHREAD *, struct svc_req *);
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#endif /* _KERNEL */
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#endif /* _NFS_FHA_NEW_H */
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