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      1 /*	$NetBSD: nfs_fha.h,v 1.3 2016/11/18 08:31:30 pgoyette Exp $	*/
      2 /*-
      3  * Copyright (c) 2008 Isilon Inc http://www.isilon.com/
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  *
     14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     24  * SUCH DAMAGE.
     25  */
     26 /* FreeBSD: head/sys/nfs/nfs_fha.h 260097 2013-12-30 20:23:15Z mav  */
     27 /* $NetBSD: nfs_fha.h,v 1.3 2016/11/18 08:31:30 pgoyette Exp $ */
     28 
     29 #ifndef	_NFS_FHA_H
     30 #define	_NFS_FHA_H 1
     31 
     32 #ifdef	_KERNEL
     33 
     34 /* Sysctl defaults. */
     35 #define FHA_DEF_ENABLE			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 	uint32_t bin_shift;
     45 	uint32_t max_nfsds_per_fh;
     46 	uint32_t max_reqs_per_nfsd;
     47 };
     48 
     49 /*
     50  * These are the entries in the filehandle hash.  They talk about a specific
     51  * file, requests against which are being handled by one or more nfsds.  We
     52  * keep a chain of nfsds against the file. We only have more than one if reads
     53  * are ongoing, and then only if the reads affect disparate regions of the
     54  * file.
     55  *
     56  * In general, we want to assign a new request to an existing nfsd if it is
     57  * going to contend with work happening already on that nfsd, or if the
     58  * operation is a read and the nfsd is already handling a proximate read.  We
     59  * do this to avoid jumping around in the read stream unnecessarily, and to
     60  * avoid contention between threads over single files.
     61  */
     62 struct fha_hash_entry {
     63 	struct mtx *mtx;
     64 	LIST_ENTRY(fha_hash_entry) link;
     65 	u_int64_t fh;
     66 	u_int32_t num_rw;
     67 	u_int32_t num_exclusive;
     68 	u_int8_t num_threads;
     69 	struct svcthread_list threads;
     70 };
     71 
     72 LIST_HEAD(fha_hash_entry_list, fha_hash_entry);
     73 
     74 struct fha_hash_slot {
     75 	struct fha_hash_entry_list list;
     76 	struct mtx mtx;
     77 };
     78 
     79 /* A structure used for passing around data internally. */
     80 struct fha_info {
     81 	u_int64_t fh;
     82 	off_t offset;
     83 	int locktype;
     84 };
     85 
     86 struct fha_callbacks {
     87 	rpcproc_t (*get_procnum)(rpcproc_t procnum);
     88 	int (*realign)(struct mbuf **mb, int malloc_flags);
     89 	int (*get_fh)(uint64_t *fh, int v3, struct mbuf **md, caddr_t *dpos);
     90 	int (*is_read)(rpcproc_t procnum);
     91 	int (*is_write)(rpcproc_t procnum);
     92 	int (*get_offset)(struct mbuf **md, caddr_t *dpos, int v3, struct
     93 			  fha_info *info);
     94 	int (*no_offset)(rpcproc_t procnum);
     95 	void (*set_locktype)(rpcproc_t procnum, struct fha_info *info);
     96 	int (*fhe_stats_sysctl)(SYSCTL_HANDLER_ARGS);
     97 };
     98 
     99 struct fha_params {
    100 	struct fha_hash_slot fha_hash[FHA_HASH_SIZE];
    101 	struct sysctl_ctx_list sysctl_ctx;
    102 	struct sysctl_oid *sysctl_tree;
    103 	struct fha_ctls ctls;
    104 	struct fha_callbacks callbacks;
    105 	char server_name[32];
    106 	SVCPOOL **pool;
    107 };
    108 
    109 void fha_nd_complete(SVCTHREAD *, struct svc_req *);
    110 SVCTHREAD *fha_assign(SVCTHREAD *, struct svc_req *, struct fha_params *);
    111 void fha_init(struct fha_params *softc);
    112 void fha_uninit(struct fha_params *softc);
    113 int fhe_stats_sysctl(SYSCTL_HANDLER_ARGS, struct fha_params *softc);
    114 
    115 #endif /* _KERNEL */
    116 #endif /* _NFS_FHA_H_ */
    117