diff options
Diffstat (limited to 'sys/nfs/nfs_fha.h')
| -rw-r--r-- | sys/nfs/nfs_fha.h | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/sys/nfs/nfs_fha.h b/sys/nfs/nfs_fha.h new file mode 100644 index 0000000..ef5ada0 --- /dev/null +++ b/sys/nfs/nfs_fha.h @@ -0,0 +1,112 @@ +/*- + * Copyright (c) 2008 Isilon Inc http://www.isilon.com/ + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ +/* $FreeBSD$ */ + +#ifndef _NFS_FHA_H +#define _NFS_FHA_H 1 + +#ifdef _KERNEL + +/* Sysctl defaults. */ +#define FHA_DEF_ENABLE 1 +#define FHA_DEF_BIN_SHIFT 22 /* 4MB */ +#define FHA_DEF_MAX_NFSDS_PER_FH 8 +#define FHA_DEF_MAX_REQS_PER_NFSD 0 /* Unlimited */ + +/* This is the global structure that represents the state of the fha system. */ +struct fha_global { + struct fha_hash_entry_list *hashtable; + u_long hashmask; +}; + +struct fha_ctls { + int enable; + uint32_t bin_shift; + uint32_t max_nfsds_per_fh; + uint32_t max_reqs_per_nfsd; +}; + +/* + * These are the entries in the filehandle hash. They talk about a specific + * file, requests against which are being handled by one or more nfsds. We + * keep a chain of nfsds against the file. We only have more than one if reads + * are ongoing, and then only if the reads affect disparate regions of the + * file. + * + * In general, we want to assign a new request to an existing nfsd if it is + * going to contend with work happening already on that nfsd, or if the + * operation is a read and the nfsd is already handling a proximate read. We + * do this to avoid jumping around in the read stream unnecessarily, and to + * avoid contention between threads over single files. + */ +struct fha_hash_entry { + LIST_ENTRY(fha_hash_entry) link; + u_int64_t fh; + u_int32_t num_rw; + u_int32_t num_exclusive; + u_int8_t num_threads; + struct svcthread_list threads; +}; + +LIST_HEAD(fha_hash_entry_list, fha_hash_entry); + +/* A structure used for passing around data internally. */ +struct fha_info { + u_int64_t fh; + off_t offset; + int locktype; +}; + +struct fha_callbacks { + rpcproc_t (*get_procnum)(rpcproc_t procnum); + int (*realign)(struct mbuf **mb, int malloc_flags); + int (*get_fh)(fhandle_t *fh, int v3, struct mbuf **md, caddr_t *dpos); + int (*is_read)(rpcproc_t procnum); + int (*is_write)(rpcproc_t procnum); + int (*get_offset)(struct mbuf **md, caddr_t *dpos, int v3, struct + fha_info *info); + int (*no_offset)(rpcproc_t procnum); + void (*set_locktype)(rpcproc_t procnum, struct fha_info *info); + int (*fhe_stats_sysctl)(SYSCTL_HANDLER_ARGS); +}; + +struct fha_params { + struct fha_global g_fha; + struct sysctl_ctx_list sysctl_ctx; + struct sysctl_oid *sysctl_tree; + struct fha_ctls ctls; + struct fha_callbacks callbacks; + char server_name[32]; + SVCPOOL **pool; +}; + +void fha_nd_complete(SVCTHREAD *, struct svc_req *); +SVCTHREAD *fha_assign(SVCTHREAD *, struct svc_req *, struct fha_params *); +void fha_init(struct fha_params *softc); +void fha_uninit(struct fha_params *softc); +int fhe_stats_sysctl(SYSCTL_HANDLER_ARGS, struct fha_params *softc); + +#endif /* _KERNEL */ +#endif /* _NFS_FHA_H_ */ |
