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31 * lockd uses the nfssvc system call to get the unique kernel services it needs.
32 * It passes in a request structure with a version number at the start.
33 * This prevents libc from needing to change if the information passed
34 * between lockd and the kernel needs to change.
36 * If a structure changes, you must bump the version number.
40 * The fifo where the kernel writes requests for locks on remote NFS files,
41 * and where lockd reads these requests.
44 #define _PATH_NFSLCKDEV "nfslock"
47 * This structure is used to uniquely identify the process which originated
48 * a particular message to lockd. A sequence number is used to differentiate
49 * multiple messages from the same process. A process start time is used to
50 * detect the unlikely, but possible, event of the recycling of a pid.
52 struct lockd_msg_ident {
53 pid_t pid; /* The process ID. */
54 struct timeval pid_start; /* Start time of process id */
55 int msg_seq; /* Sequence number of message */
58 #define LOCKD_MSG_VERSION 3
61 * The structure that the kernel hands us for each lock request.
63 typedef struct __lock_msg {
64 TAILQ_ENTRY(__lock_msg) lm_link; /* internal linkage */
65 int lm_version; /* which version is this */
66 struct lockd_msg_ident lm_msg_ident; /* originator of the message */
67 struct flock lm_fl; /* The lock request. */
68 int lm_wait; /* The F_WAIT flag. */
69 int lm_getlk; /* is this a F_GETLK request */
70 struct sockaddr_storage lm_addr; /* The address. */
71 int lm_nfsv3; /* If NFS version 3. */
72 size_t lm_fh_len; /* The file handle length. */
73 struct xucred lm_cred; /* user cred for lock req */
74 u_int8_t lm_fh[NFSX_V3FHMAX];/* The file handle. */
77 #define LOCKD_ANS_VERSION 1
81 struct lockd_msg_ident la_msg_ident; /* originator of the message */
83 int la_set_getlk_pid; /* use returned pid */
84 int la_getlk_pid; /* returned pid for F_GETLK */
88 int ncl_dolock(struct vop_advlock_args *ap);