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8b431c9576
userland and a dedicated system call to get replies. The vnode-bypass of fifos broke this into a panic. Ditch all the magic and create a device /dev/nfslock instead, and use that for both directions apart from the shorter path, this is also faster because the device driver runs Giant free using the vnode bypass. Noticed by: marcel
93 lines
3.6 KiB
C
93 lines
3.6 KiB
C
/*-
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* Copyright (c) 1998 Berkeley Software Design, Inc. All rights reserved.
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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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* 3. Berkeley Software Design Inc's name may not be used to endorse or
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* promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``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 BERKELEY SOFTWARE DESIGN INC 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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* from nfs_lock.h,v 2.2 1998/04/28 19:38:41 don Exp
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* $FreeBSD$
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*/
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/*
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* lockd uses the nfssvc system call to get the unique kernel services it needs.
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* It passes in a request structure with a version number at the start.
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* This prevents libc from needing to change if the information passed
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* between lockd and the kernel needs to change.
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*
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* If a structure changes, you must bump the version number.
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*/
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#include <nfs/nfsproto.h>
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/*
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* The fifo where the kernel writes requests for locks on remote NFS files,
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* and where lockd reads these requests.
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*
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*/
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#define _PATH_NFSLCKDEV "nfslock"
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/*
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* This structure is used to uniquely identify the process which originated
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* a particular message to lockd. A sequence number is used to differentiate
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* multiple messages from the same process. A process start time is used to
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* detect the unlikely, but possible, event of the recycling of a pid.
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*/
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struct lockd_msg_ident {
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pid_t pid; /* The process ID. */
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struct timeval pid_start; /* Start time of process id */
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int msg_seq; /* Sequence number of message */
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};
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#define LOCKD_MSG_VERSION 3
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/*
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* The structure that the kernel hands us for each lock request.
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*/
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typedef struct __lock_msg {
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TAILQ_ENTRY(__lock_msg) lm_link; /* internal linkage */
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int lm_version; /* which version is this */
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struct lockd_msg_ident lm_msg_ident; /* originator of the message */
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struct flock lm_fl; /* The lock request. */
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int lm_wait; /* The F_WAIT flag. */
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int lm_getlk; /* is this a F_GETLK request */
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struct sockaddr_storage lm_addr; /* The address. */
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int lm_nfsv3; /* If NFS version 3. */
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size_t lm_fh_len; /* The file handle length. */
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struct xucred lm_cred; /* user cred for lock req */
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u_int8_t lm_fh[NFS_SMALLFH];/* The file handle. */
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} LOCKD_MSG;
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#define LOCKD_ANS_VERSION 1
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struct lockd_ans {
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int la_vers;
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struct lockd_msg_ident la_msg_ident; /* originator of the message */
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int la_errno;
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int la_set_getlk_pid; /* use returned pid */
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int la_getlk_pid; /* returned pid for F_GETLK */
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};
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#ifdef _KERNEL
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int nfs_dolock(struct vop_advlock_args *ap);
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#endif
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