diff options
Diffstat (limited to 'sys/nfs/nfs_lock.h')
-rw-r--r-- | sys/nfs/nfs_lock.h | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/sys/nfs/nfs_lock.h b/sys/nfs/nfs_lock.h new file mode 100644 index 0000000..64b6c70 --- /dev/null +++ b/sys/nfs/nfs_lock.h @@ -0,0 +1,112 @@ +/*- + * Copyright (c) 1998 Berkeley Software Design, Inc. All rights reserved. + * 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. + * 3. Berkeley Software Design Inc's name may not be used to endorse or + * promote products derived from this software without specific prior + * written permission. + * + * THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``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 BERKELEY SOFTWARE DESIGN INC 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. + * + * from nfs_lock.h,v 2.2 1998/04/28 19:38:41 don Exp + * $FreeBSD$ + */ + +/* + * lockd uses the nfssvc system call to get the unique kernel services it needs. + * It passes in a request structure with a version number at the start. + * This prevents libc from needing to change if the information passed + * between lockd and the kernel needs to change. + * + * If a structure changes, you must bump the version number. + */ + +#include <nfs/nfsproto.h> + + +#define LOCKD_REQ_VERSION 1 + +struct lockd_req { + int vers; /* keep in sync with kernel please */ + int op; /* F_GETLK | F_SETLK | F_UNLCK */ + int owner; /* owner of lock, -1 to allocate one */ + int owner_rel_ok; /* release owner if no locks left ? */ + int *owner_ret; /* owner alloc/free result target */ + void *fh; /* NFS file handle */ + size_t fh_len; /* NFS file handle length */ + u_quad_t offset; /* offset of where to start lock */ + u_quad_t len; /* length of range to lock */ + int type; /* F_RDLCK | F_WRLCK | F_UNLCK */ + struct ucred cred; /* user credentials to use for lock */ + struct sockaddr saddr; /* XXX how about non AF_INET ?? */ + int pid; /* pid of lock requester */ +}; + +/* + * The fifo where the kernel writes requests for locks on remote NFS files, + * and where lockd reads these requests. + * + */ +#define _PATH_LCKFIFO "/var/run/lock" + +/* + * This structure is used to uniquely identify the process which originated + * a particular message to lockd. A sequence number is used to differentiate + * multiple messages from the same process. A process start time is used to + * detect the unlikely, but possible, event of the recycling of a pid. + */ +struct lockd_msg_ident { + pid_t pid; /* The process ID. */ + struct timeval pid_start; /* Start time of process id */ + int msg_seq; /* Sequence number of message */ +}; + +#define LOCKD_MSG_VERSION 1 + +/* + * The structure that the kernel hands us for each lock request. + */ +typedef struct __lock_msg { + int lm_version; /* which version is this */ + struct lockd_msg_ident lm_msg_ident; /* originator of the message */ + struct flock lm_fl; /* The lock request. */ + int lm_wait; /* The F_WAIT flag. */ + int lm_getlk; /* is this a F_GETLK request */ + struct sockaddr lm_addr; /* The address. */ + int lm_nfsv3; /* If NFS version 3. */ + size_t lm_fh_len; /* The file handle length. */ + struct ucred lm_cred; /* user cred for lock req */ + u_int8_t lm_fh[NFS_SMALLFH];/* The file handle. */ +} LOCKD_MSG; + +#define LOCKD_ANS_VERSION 1 + +struct lockd_ans { + int la_vers; + struct lockd_msg_ident la_msg_ident; /* originator of the message */ + int la_errno; + int la_set_getlk_pid; /* use returned pid */ + int la_getlk_pid; /* returned pid for F_GETLK */ +}; + +#ifdef _KERNEL +int nfs_dolock(struct vop_advlock_args *ap); +int nfslockdans(struct proc *p, struct lockd_ans *ansp); +int nfslockdreq(struct proc *p, struct lockd_req *reqp); +#endif |