The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/nfs/nfs_fha.h

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    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 /* $FreeBSD$ */
   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_READ                    1
   35 #define FHA_DEF_WRITE                   1
   36 #define FHA_DEF_BIN_SHIFT               22 /* 4MB */
   37 #define FHA_DEF_MAX_NFSDS_PER_FH        8
   38 #define FHA_DEF_MAX_REQS_PER_NFSD       0  /* Unlimited */
   39 
   40 #define FHA_HASH_SIZE   251
   41 
   42 struct fha_ctls {
   43         int      enable;
   44         int      read;
   45         int      write;
   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  */
   64 struct fha_hash_entry {
   65         struct mtx *mtx;
   66         LIST_ENTRY(fha_hash_entry) link;
   67         u_int64_t fh;
   68         u_int32_t num_rw;
   69         u_int32_t num_exclusive;
   70         u_int8_t num_threads;
   71         struct svcthread_list threads;
   72 };
   73 
   74 LIST_HEAD(fha_hash_entry_list, fha_hash_entry);
   75 
   76 struct fha_hash_slot {
   77         struct fha_hash_entry_list list;
   78         struct mtx mtx;
   79 };
   80 
   81 /* A structure used for passing around data internally. */
   82 struct fha_info {
   83         u_int64_t fh;
   84         off_t offset;
   85         int locktype;
   86         int read;
   87         int write;
   88 };
   89 
   90 struct fha_callbacks {
   91         rpcproc_t (*get_procnum)(rpcproc_t procnum);
   92         int (*realign)(struct mbuf **mb, int malloc_flags);
   93         int (*get_fh)(uint64_t *fh, int v3, struct mbuf **md, caddr_t *dpos);
   94         int (*is_read)(rpcproc_t procnum);
   95         int (*is_write)(rpcproc_t procnum);
   96         int (*get_offset)(struct mbuf **md, caddr_t *dpos, int v3, struct
   97                           fha_info *info);
   98         int (*no_offset)(rpcproc_t procnum);
   99         void (*set_locktype)(rpcproc_t procnum, struct fha_info *info);
  100         int (*fhe_stats_sysctl)(SYSCTL_HANDLER_ARGS);
  101 };
  102 
  103 struct fha_params {
  104         struct fha_hash_slot fha_hash[FHA_HASH_SIZE];
  105         struct sysctl_ctx_list sysctl_ctx;
  106         struct sysctl_oid *sysctl_tree;
  107         struct fha_ctls ctls;
  108         struct fha_callbacks callbacks;
  109         char server_name[32];
  110         SVCPOOL **pool;
  111 };
  112 
  113 void fha_nd_complete(SVCTHREAD *, struct svc_req *);
  114 SVCTHREAD *fha_assign(SVCTHREAD *, struct svc_req *, struct fha_params *);
  115 void fha_init(struct fha_params *softc);
  116 void fha_uninit(struct fha_params *softc);
  117 int fhe_stats_sysctl(SYSCTL_HANDLER_ARGS, struct fha_params *softc);
  118 
  119 #endif /* _KERNEL */
  120 #endif /* _NFS_FHA_H_ */

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