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29 * from nfs_lock.h,v 2.2 1998/04/28 19:38:41 don Exp
33 * lockd uses the nfssvc system call to get the unique kernel services it needs.
34 * It passes in a request structure with a version number at the start.
35 * This prevents libc from needing to change if the information passed
36 * between lockd and the kernel needs to change.
38 * If a structure changes, you must bump the version number.
42 * The fifo where the kernel writes requests for locks on remote NFS files,
43 * and where lockd reads these requests.
46 #define _PATH_NFSLCKDEV "nfslock"
49 * This structure is used to uniquely identify the process which originated
50 * a particular message to lockd. A sequence number is used to differentiate
51 * multiple messages from the same process. A process start time is used to
52 * detect the unlikely, but possible, event of the recycling of a pid.
54 struct lockd_msg_ident {
55 pid_t pid; /* The process ID. */
56 struct timeval pid_start; /* Start time of process id */
57 int msg_seq; /* Sequence number of message */
60 #define LOCKD_MSG_VERSION 3
63 * The structure that the kernel hands us for each lock request.
65 typedef struct __lock_msg {
66 TAILQ_ENTRY(__lock_msg) lm_link; /* internal linkage */
67 int lm_version; /* which version is this */
68 struct lockd_msg_ident lm_msg_ident; /* originator of the message */
69 struct flock lm_fl; /* The lock request. */
70 int lm_wait; /* The F_WAIT flag. */
71 int lm_getlk; /* is this a F_GETLK request */
72 struct sockaddr_storage lm_addr; /* The address. */
73 int lm_nfsv3; /* If NFS version 3. */
74 size_t lm_fh_len; /* The file handle length. */
75 struct xucred lm_cred; /* user cred for lock req */
76 u_int8_t lm_fh[NFSX_V3FHMAX];/* The file handle. */
79 #define LOCKD_ANS_VERSION 1
83 struct lockd_msg_ident la_msg_ident; /* originator of the message */
85 int la_set_getlk_pid; /* use returned pid */
86 int la_getlk_pid; /* returned pid for F_GETLK */
90 int nfs_dolock(struct vop_advlock_args *ap);
91 extern vop_advlock_t *nfs_advlock_p;
92 extern vop_reclaim_t *nfs_reclaim_p;