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1273 lines
30 KiB
C
1273 lines
30 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2008 Isilon Inc http://www.isilon.com/
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* Authors: Doug Rabson <dfr@rabson.org>
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* Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org>
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*
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 THE AUTHOR OR CONTRIBUTORS 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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#include <sys/param.h>
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#include <sys/fcntl.h>
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#include <sys/jail.h>
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#include <sys/kernel.h>
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#include <sys/limits.h>
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#include <sys/lock.h>
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#include <sys/lockf.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/mount.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/socket.h>
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#include <sys/syslog.h>
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#include <sys/systm.h>
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#include <sys/unistd.h>
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#include <sys/vnode.h>
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#include <nfs/nfsproto.h>
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#include <nfsclient/nfs.h>
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#include <nfsclient/nfsmount.h>
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#include <nlm/nlm_prot.h>
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#include <nlm/nlm.h>
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/*
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* We need to keep track of the svid values used for F_FLOCK locks.
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*/
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struct nlm_file_svid {
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int ns_refs; /* thread count + 1 if active */
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int ns_svid; /* on-the-wire SVID for this file */
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struct ucred *ns_ucred; /* creds to use for lock recovery */
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void *ns_id; /* local struct file pointer */
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bool_t ns_active; /* TRUE if we own a lock */
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LIST_ENTRY(nlm_file_svid) ns_link;
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};
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LIST_HEAD(nlm_file_svid_list, nlm_file_svid);
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#define NLM_SVID_HASH_SIZE 256
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struct nlm_file_svid_list nlm_file_svids[NLM_SVID_HASH_SIZE];
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struct mtx nlm_svid_lock;
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static struct unrhdr *nlm_svid_allocator;
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static volatile u_int nlm_xid = 1;
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static int nlm_setlock(struct nlm_host *host, struct rpc_callextra *ext,
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rpcvers_t vers, struct timeval *timo, int retries,
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struct vnode *vp, int op, struct flock *fl, int flags,
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int svid, size_t fhlen, void *fh, off_t size, bool_t reclaim);
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static int nlm_clearlock(struct nlm_host *host, struct rpc_callextra *ext,
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rpcvers_t vers, struct timeval *timo, int retries,
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struct vnode *vp, int op, struct flock *fl, int flags,
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int svid, size_t fhlen, void *fh, off_t size);
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static int nlm_getlock(struct nlm_host *host, struct rpc_callextra *ext,
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rpcvers_t vers, struct timeval *timo, int retries,
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struct vnode *vp, int op, struct flock *fl, int flags,
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int svid, size_t fhlen, void *fh, off_t size);
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static int nlm_map_status(nlm4_stats stat);
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static struct nlm_file_svid *nlm_find_svid(void *id);
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static void nlm_free_svid(struct nlm_file_svid *nf);
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static int nlm_init_lock(struct flock *fl, int flags, int svid,
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rpcvers_t vers, size_t fhlen, void *fh, off_t size,
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struct nlm4_lock *lock, char oh_space[32]);
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static void
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nlm_client_init(void *dummy)
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{
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int i;
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mtx_init(&nlm_svid_lock, "NLM svid lock", NULL, MTX_DEF);
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/* pid_max cannot be greater than PID_MAX */
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nlm_svid_allocator = new_unrhdr(PID_MAX + 2, INT_MAX, &nlm_svid_lock);
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for (i = 0; i < NLM_SVID_HASH_SIZE; i++)
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LIST_INIT(&nlm_file_svids[i]);
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}
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SYSINIT(nlm_client_init, SI_SUB_LOCK, SI_ORDER_FIRST, nlm_client_init, NULL);
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static int
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nlm_msg(struct thread *td, const char *server, const char *msg, int error)
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{
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struct proc *p;
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p = td ? td->td_proc : NULL;
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if (error) {
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tprintf(p, LOG_INFO, "nfs server %s: %s, error %d\n", server,
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msg, error);
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} else {
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tprintf(p, LOG_INFO, "nfs server %s: %s\n", server, msg);
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}
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return (0);
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}
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struct nlm_feedback_arg {
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bool_t nf_printed;
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struct nfsmount *nf_nmp;
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};
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static void
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nlm_down(struct nlm_feedback_arg *nf, struct thread *td,
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const char *msg, int error)
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{
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struct nfsmount *nmp = nf->nf_nmp;
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if (nmp == NULL)
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return;
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mtx_lock(&nmp->nm_mtx);
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if (!(nmp->nm_state & NFSSTA_LOCKTIMEO)) {
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nmp->nm_state |= NFSSTA_LOCKTIMEO;
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mtx_unlock(&nmp->nm_mtx);
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vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
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VQ_NOTRESPLOCK, 0);
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} else {
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mtx_unlock(&nmp->nm_mtx);
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}
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nf->nf_printed = TRUE;
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nlm_msg(td, nmp->nm_mountp->mnt_stat.f_mntfromname, msg, error);
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}
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static void
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nlm_up(struct nlm_feedback_arg *nf, struct thread *td,
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const char *msg)
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{
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struct nfsmount *nmp = nf->nf_nmp;
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if (!nf->nf_printed)
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return;
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nlm_msg(td, nmp->nm_mountp->mnt_stat.f_mntfromname, msg, 0);
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mtx_lock(&nmp->nm_mtx);
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if (nmp->nm_state & NFSSTA_LOCKTIMEO) {
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nmp->nm_state &= ~NFSSTA_LOCKTIMEO;
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mtx_unlock(&nmp->nm_mtx);
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vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
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VQ_NOTRESPLOCK, 1);
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} else {
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mtx_unlock(&nmp->nm_mtx);
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}
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}
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static void
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nlm_feedback(int type, int proc, void *arg)
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{
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struct thread *td = curthread;
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struct nlm_feedback_arg *nf = (struct nlm_feedback_arg *) arg;
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switch (type) {
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case FEEDBACK_REXMIT2:
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case FEEDBACK_RECONNECT:
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nlm_down(nf, td, "lockd not responding", 0);
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break;
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case FEEDBACK_OK:
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nlm_up(nf, td, "lockd is alive again");
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break;
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}
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}
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/*
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* nlm_advlock --
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* NFS advisory byte-level locks.
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*/
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static int
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nlm_advlock_internal(struct vnode *vp, void *id, int op, struct flock *fl,
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int flags, bool_t reclaim, bool_t unlock_vp)
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{
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struct thread *td = curthread;
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struct nfsmount *nmp;
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off_t size;
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size_t fhlen;
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union nfsfh fh;
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struct sockaddr *sa;
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struct sockaddr_storage ss;
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char *servername;
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struct timeval timo;
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int retries;
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rpcvers_t vers;
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struct nlm_host *host;
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struct rpc_callextra ext;
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struct nlm_feedback_arg nf;
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AUTH *auth;
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struct ucred *cred, *cred1;
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struct nlm_file_svid *ns;
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int svid;
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int error;
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int is_v3;
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ASSERT_VOP_LOCKED(vp, "nlm_advlock_1");
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servername = malloc(MNAMELEN, M_TEMP, M_WAITOK); /* XXXKIB vp locked */
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nmp = VFSTONFS(vp->v_mount);
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/*
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* Push any pending writes to the server and flush our cache
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* so that if we are contending with another machine for a
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* file, we get whatever they wrote and vice-versa.
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*/
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if (op == F_SETLK || op == F_UNLCK)
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nmp->nm_vinvalbuf(vp, V_SAVE, td, 1);
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strcpy(servername, nmp->nm_hostname);
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nmp->nm_getinfo(vp, fh.fh_bytes, &fhlen, &ss, &is_v3, &size, &timo);
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sa = (struct sockaddr *) &ss;
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if (is_v3 != 0)
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vers = NLM_VERS4;
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else
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vers = NLM_VERS;
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if (nmp->nm_flag & NFSMNT_SOFT)
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retries = nmp->nm_retry;
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else
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retries = INT_MAX;
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/*
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* We need to switch to mount-point creds so that we can send
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* packets from a privileged port. Reference mnt_cred and
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* switch to them before unlocking the vnode, since mount
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* point could be unmounted right after unlock.
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*/
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cred = td->td_ucred;
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td->td_ucred = vp->v_mount->mnt_cred;
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crhold(td->td_ucred);
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if (unlock_vp)
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VOP_UNLOCK(vp);
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host = nlm_find_host_by_name(servername, sa, vers);
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auth = authunix_create(cred);
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memset(&ext, 0, sizeof(ext));
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nf.nf_printed = FALSE;
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nf.nf_nmp = nmp;
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ext.rc_auth = auth;
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ext.rc_feedback = nlm_feedback;
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ext.rc_feedback_arg = &nf;
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ext.rc_timers = NULL;
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ns = NULL;
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if (flags & F_FLOCK) {
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ns = nlm_find_svid(id);
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KASSERT(fl->l_start == 0 && fl->l_len == 0,
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("F_FLOCK lock requests must be whole-file locks"));
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if (!ns->ns_ucred) {
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/*
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* Remember the creds used for locking in case
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* we need to recover the lock later.
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*/
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ns->ns_ucred = crdup(cred);
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}
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svid = ns->ns_svid;
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} else if (flags & F_REMOTE) {
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/*
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* If we are recovering after a server restart or
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* trashing locks on a force unmount, use the same
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* svid as last time.
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*/
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svid = fl->l_pid;
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} else {
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svid = ((struct proc *) id)->p_pid;
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}
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switch(op) {
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case F_SETLK:
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if ((flags & (F_FLOCK|F_WAIT)) == (F_FLOCK|F_WAIT)
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&& fl->l_type == F_WRLCK) {
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/*
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* The semantics for flock(2) require that any
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* shared lock on the file must be released
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* before an exclusive lock is granted. The
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* local locking code interprets this by
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* unlocking the file before sleeping on a
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* blocked exclusive lock request. We
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* approximate this by first attempting
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* non-blocking and if that fails, we unlock
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* the file and block.
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*/
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error = nlm_setlock(host, &ext, vers, &timo, retries,
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vp, F_SETLK, fl, flags & ~F_WAIT,
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svid, fhlen, &fh.fh_bytes, size, reclaim);
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if (error == EAGAIN) {
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fl->l_type = F_UNLCK;
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error = nlm_clearlock(host, &ext, vers, &timo,
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retries, vp, F_UNLCK, fl, flags,
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svid, fhlen, &fh.fh_bytes, size);
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fl->l_type = F_WRLCK;
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if (!error) {
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mtx_lock(&nlm_svid_lock);
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if (ns->ns_active) {
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ns->ns_refs--;
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ns->ns_active = FALSE;
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}
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mtx_unlock(&nlm_svid_lock);
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flags |= F_WAIT;
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error = nlm_setlock(host, &ext, vers,
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&timo, retries, vp, F_SETLK, fl,
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flags, svid, fhlen, &fh.fh_bytes,
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size, reclaim);
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}
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}
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} else {
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error = nlm_setlock(host, &ext, vers, &timo, retries,
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vp, op, fl, flags, svid, fhlen, &fh.fh_bytes,
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size, reclaim);
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}
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if (!error && ns) {
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mtx_lock(&nlm_svid_lock);
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if (!ns->ns_active) {
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/*
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* Add one to the reference count to
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* hold onto the SVID for the lifetime
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* of the lock. Note that since
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* F_FLOCK only supports whole-file
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* locks, there can only be one active
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* lock for this SVID.
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*/
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ns->ns_refs++;
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ns->ns_active = TRUE;
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}
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mtx_unlock(&nlm_svid_lock);
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}
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break;
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case F_UNLCK:
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error = nlm_clearlock(host, &ext, vers, &timo, retries,
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vp, op, fl, flags, svid, fhlen, &fh.fh_bytes, size);
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if (!error && ns) {
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mtx_lock(&nlm_svid_lock);
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if (ns->ns_active) {
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ns->ns_refs--;
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ns->ns_active = FALSE;
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}
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mtx_unlock(&nlm_svid_lock);
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}
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break;
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case F_GETLK:
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error = nlm_getlock(host, &ext, vers, &timo, retries,
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vp, op, fl, flags, svid, fhlen, &fh.fh_bytes, size);
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break;
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default:
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error = EINVAL;
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break;
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}
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if (ns)
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nlm_free_svid(ns);
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cred1 = td->td_ucred;
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td->td_ucred = cred;
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crfree(cred1);
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AUTH_DESTROY(auth);
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nlm_host_release(host);
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free(servername, M_TEMP);
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return (error);
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}
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int
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nlm_advlock(struct vop_advlock_args *ap)
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{
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return (nlm_advlock_internal(ap->a_vp, ap->a_id, ap->a_op, ap->a_fl,
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ap->a_flags, FALSE, TRUE));
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}
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/*
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* Set the creds of td to the creds of the given lock's owner. The new
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* creds reference count will be incremented via crhold. The caller is
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* responsible for calling crfree and restoring td's original creds.
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*/
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static void
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nlm_set_creds_for_lock(struct thread *td, struct flock *fl)
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{
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int i;
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struct nlm_file_svid *ns;
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struct proc *p;
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struct ucred *cred;
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cred = NULL;
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if (fl->l_pid > PID_MAX) {
|
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/*
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* If this was originally a F_FLOCK-style lock, we
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* recorded the creds used when it was originally
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* locked in the nlm_file_svid structure.
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*/
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mtx_lock(&nlm_svid_lock);
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for (i = 0; i < NLM_SVID_HASH_SIZE; i++) {
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for (ns = LIST_FIRST(&nlm_file_svids[i]); ns;
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ns = LIST_NEXT(ns, ns_link)) {
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if (ns->ns_svid == fl->l_pid) {
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cred = crhold(ns->ns_ucred);
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break;
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}
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}
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}
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mtx_unlock(&nlm_svid_lock);
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} else {
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/*
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* This lock is owned by a process. Get a reference to
|
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* the process creds.
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*/
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p = pfind(fl->l_pid);
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if (p) {
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cred = crhold(p->p_ucred);
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PROC_UNLOCK(p);
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}
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}
|
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|
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/*
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* If we can't find a cred, fall back on the recovery
|
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* thread's cred.
|
|
*/
|
|
if (!cred) {
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cred = crhold(td->td_ucred);
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}
|
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|
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td->td_ucred = cred;
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}
|
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|
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static int
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nlm_reclaim_free_lock(struct vnode *vp, struct flock *fl, void *arg)
|
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{
|
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struct flock newfl;
|
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struct thread *td = curthread;
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struct ucred *oldcred;
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int error;
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newfl = *fl;
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newfl.l_type = F_UNLCK;
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oldcred = td->td_ucred;
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nlm_set_creds_for_lock(td, &newfl);
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error = nlm_advlock_internal(vp, NULL, F_UNLCK, &newfl, F_REMOTE,
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FALSE, FALSE);
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crfree(td->td_ucred);
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td->td_ucred = oldcred;
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|
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return (error);
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}
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|
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int
|
|
nlm_reclaim(struct vop_reclaim_args *ap)
|
|
{
|
|
|
|
nlm_cancel_wait(ap->a_vp);
|
|
lf_iteratelocks_vnode(ap->a_vp, nlm_reclaim_free_lock, NULL);
|
|
return (0);
|
|
}
|
|
|
|
struct nlm_recovery_context {
|
|
struct nlm_host *nr_host; /* host we are recovering */
|
|
int nr_state; /* remote NSM state for recovery */
|
|
};
|
|
|
|
static int
|
|
nlm_client_recover_lock(struct vnode *vp, struct flock *fl, void *arg)
|
|
{
|
|
struct nlm_recovery_context *nr = (struct nlm_recovery_context *) arg;
|
|
struct thread *td = curthread;
|
|
struct ucred *oldcred;
|
|
int state, error;
|
|
|
|
/*
|
|
* If the remote NSM state changes during recovery, the host
|
|
* must have rebooted a second time. In that case, we must
|
|
* restart the recovery.
|
|
*/
|
|
state = nlm_host_get_state(nr->nr_host);
|
|
if (nr->nr_state != state)
|
|
return (ERESTART);
|
|
|
|
error = vn_lock(vp, LK_SHARED);
|
|
if (error)
|
|
return (error);
|
|
|
|
oldcred = td->td_ucred;
|
|
nlm_set_creds_for_lock(td, fl);
|
|
|
|
error = nlm_advlock_internal(vp, NULL, F_SETLK, fl, F_REMOTE,
|
|
TRUE, TRUE);
|
|
|
|
crfree(td->td_ucred);
|
|
td->td_ucred = oldcred;
|
|
|
|
return (error);
|
|
}
|
|
|
|
void
|
|
nlm_client_recovery(struct nlm_host *host)
|
|
{
|
|
struct nlm_recovery_context nr;
|
|
int sysid, error;
|
|
|
|
sysid = NLM_SYSID_CLIENT | nlm_host_get_sysid(host);
|
|
do {
|
|
nr.nr_host = host;
|
|
nr.nr_state = nlm_host_get_state(host);
|
|
error = lf_iteratelocks_sysid(sysid,
|
|
nlm_client_recover_lock, &nr);
|
|
} while (error == ERESTART);
|
|
}
|
|
|
|
static void
|
|
nlm_convert_to_nlm_lock(struct nlm_lock *dst, struct nlm4_lock *src)
|
|
{
|
|
|
|
dst->caller_name = src->caller_name;
|
|
dst->fh = src->fh;
|
|
dst->oh = src->oh;
|
|
dst->svid = src->svid;
|
|
dst->l_offset = src->l_offset;
|
|
dst->l_len = src->l_len;
|
|
}
|
|
|
|
static void
|
|
nlm_convert_to_nlm4_holder(struct nlm4_holder *dst, struct nlm_holder *src)
|
|
{
|
|
|
|
dst->exclusive = src->exclusive;
|
|
dst->svid = src->svid;
|
|
dst->oh = src->oh;
|
|
dst->l_offset = src->l_offset;
|
|
dst->l_len = src->l_len;
|
|
}
|
|
|
|
static void
|
|
nlm_convert_to_nlm4_res(struct nlm4_res *dst, struct nlm_res *src)
|
|
{
|
|
dst->cookie = src->cookie;
|
|
dst->stat.stat = (enum nlm4_stats) src->stat.stat;
|
|
}
|
|
|
|
static enum clnt_stat
|
|
nlm_test_rpc(rpcvers_t vers, nlm4_testargs *args, nlm4_testres *res, CLIENT *client,
|
|
struct rpc_callextra *ext, struct timeval timo)
|
|
{
|
|
if (vers == NLM_VERS4) {
|
|
return nlm4_test_4(args, res, client, ext, timo);
|
|
} else {
|
|
nlm_testargs args1;
|
|
nlm_testres res1;
|
|
enum clnt_stat stat;
|
|
|
|
args1.cookie = args->cookie;
|
|
args1.exclusive = args->exclusive;
|
|
nlm_convert_to_nlm_lock(&args1.alock, &args->alock);
|
|
memset(&res1, 0, sizeof(res1));
|
|
|
|
stat = nlm_test_1(&args1, &res1, client, ext, timo);
|
|
|
|
if (stat == RPC_SUCCESS) {
|
|
res->cookie = res1.cookie;
|
|
res->stat.stat = (enum nlm4_stats) res1.stat.stat;
|
|
if (res1.stat.stat == nlm_denied)
|
|
nlm_convert_to_nlm4_holder(
|
|
&res->stat.nlm4_testrply_u.holder,
|
|
&res1.stat.nlm_testrply_u.holder);
|
|
}
|
|
|
|
return (stat);
|
|
}
|
|
}
|
|
|
|
static enum clnt_stat
|
|
nlm_lock_rpc(rpcvers_t vers, nlm4_lockargs *args, nlm4_res *res, CLIENT *client,
|
|
struct rpc_callextra *ext, struct timeval timo)
|
|
{
|
|
if (vers == NLM_VERS4) {
|
|
return nlm4_lock_4(args, res, client, ext, timo);
|
|
} else {
|
|
nlm_lockargs args1;
|
|
nlm_res res1;
|
|
enum clnt_stat stat;
|
|
|
|
args1.cookie = args->cookie;
|
|
args1.block = args->block;
|
|
args1.exclusive = args->exclusive;
|
|
nlm_convert_to_nlm_lock(&args1.alock, &args->alock);
|
|
args1.reclaim = args->reclaim;
|
|
args1.state = args->state;
|
|
memset(&res1, 0, sizeof(res1));
|
|
|
|
stat = nlm_lock_1(&args1, &res1, client, ext, timo);
|
|
|
|
if (stat == RPC_SUCCESS) {
|
|
nlm_convert_to_nlm4_res(res, &res1);
|
|
}
|
|
|
|
return (stat);
|
|
}
|
|
}
|
|
|
|
static enum clnt_stat
|
|
nlm_cancel_rpc(rpcvers_t vers, nlm4_cancargs *args, nlm4_res *res, CLIENT *client,
|
|
struct rpc_callextra *ext, struct timeval timo)
|
|
{
|
|
if (vers == NLM_VERS4) {
|
|
return nlm4_cancel_4(args, res, client, ext, timo);
|
|
} else {
|
|
nlm_cancargs args1;
|
|
nlm_res res1;
|
|
enum clnt_stat stat;
|
|
|
|
args1.cookie = args->cookie;
|
|
args1.block = args->block;
|
|
args1.exclusive = args->exclusive;
|
|
nlm_convert_to_nlm_lock(&args1.alock, &args->alock);
|
|
memset(&res1, 0, sizeof(res1));
|
|
|
|
stat = nlm_cancel_1(&args1, &res1, client, ext, timo);
|
|
|
|
if (stat == RPC_SUCCESS) {
|
|
nlm_convert_to_nlm4_res(res, &res1);
|
|
}
|
|
|
|
return (stat);
|
|
}
|
|
}
|
|
|
|
static enum clnt_stat
|
|
nlm_unlock_rpc(rpcvers_t vers, nlm4_unlockargs *args, nlm4_res *res, CLIENT *client,
|
|
struct rpc_callextra *ext, struct timeval timo)
|
|
{
|
|
if (vers == NLM_VERS4) {
|
|
return nlm4_unlock_4(args, res, client, ext, timo);
|
|
} else {
|
|
nlm_unlockargs args1;
|
|
nlm_res res1;
|
|
enum clnt_stat stat;
|
|
|
|
args1.cookie = args->cookie;
|
|
nlm_convert_to_nlm_lock(&args1.alock, &args->alock);
|
|
memset(&res1, 0, sizeof(res1));
|
|
|
|
stat = nlm_unlock_1(&args1, &res1, client, ext, timo);
|
|
|
|
if (stat == RPC_SUCCESS) {
|
|
nlm_convert_to_nlm4_res(res, &res1);
|
|
}
|
|
|
|
return (stat);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Called after a lock request (set or clear) succeeded. We record the
|
|
* details in the local lock manager. Note that since the remote
|
|
* server has granted the lock, we can be sure that it doesn't
|
|
* conflict with any other locks we have in the local lock manager.
|
|
*
|
|
* Since it is possible that host may also make NLM client requests to
|
|
* our NLM server, we use a different sysid value to record our own
|
|
* client locks.
|
|
*
|
|
* Note that since it is possible for us to receive replies from the
|
|
* server in a different order than the locks were granted (e.g. if
|
|
* many local threads are contending for the same lock), we must use a
|
|
* blocking operation when registering with the local lock manager.
|
|
* We expect that any actual wait will be rare and short hence we
|
|
* ignore signals for this.
|
|
*/
|
|
static void
|
|
nlm_record_lock(struct vnode *vp, int op, struct flock *fl,
|
|
int svid, int sysid, off_t size)
|
|
{
|
|
struct vop_advlockasync_args a;
|
|
struct flock newfl;
|
|
struct proc *p;
|
|
int error, stops_deferred;
|
|
|
|
a.a_vp = vp;
|
|
a.a_id = NULL;
|
|
a.a_op = op;
|
|
a.a_fl = &newfl;
|
|
a.a_flags = F_REMOTE|F_WAIT|F_NOINTR;
|
|
a.a_task = NULL;
|
|
a.a_cookiep = NULL;
|
|
newfl.l_start = fl->l_start;
|
|
newfl.l_len = fl->l_len;
|
|
newfl.l_type = fl->l_type;
|
|
newfl.l_whence = fl->l_whence;
|
|
newfl.l_pid = svid;
|
|
newfl.l_sysid = NLM_SYSID_CLIENT | sysid;
|
|
|
|
for (;;) {
|
|
error = lf_advlockasync(&a, &vp->v_lockf, size);
|
|
if (error == EDEADLK) {
|
|
/*
|
|
* Locks are associated with the processes and
|
|
* not with threads. Suppose we have two
|
|
* threads A1 A2 in one process, A1 locked
|
|
* file f1, A2 is locking file f2, and A1 is
|
|
* unlocking f1. Then remote server may
|
|
* already unlocked f1, while local still not
|
|
* yet scheduled A1 to make the call to local
|
|
* advlock manager. The process B owns lock on
|
|
* f2 and issued the lock on f1. Remote would
|
|
* grant B the request on f1, but local would
|
|
* return EDEADLK.
|
|
*/
|
|
pause("nlmdlk", 1);
|
|
p = curproc;
|
|
stops_deferred = sigdeferstop(SIGDEFERSTOP_OFF);
|
|
PROC_LOCK(p);
|
|
thread_suspend_check(0);
|
|
PROC_UNLOCK(p);
|
|
sigallowstop(stops_deferred);
|
|
} else if (error == EINTR) {
|
|
/*
|
|
* lf_purgelocks() might wake up the lock
|
|
* waiter and removed our lock graph edges.
|
|
* There is no sense in re-trying recording
|
|
* the lock to the local manager after
|
|
* reclaim.
|
|
*/
|
|
error = 0;
|
|
break;
|
|
} else
|
|
break;
|
|
}
|
|
KASSERT(error == 0 || error == ENOENT,
|
|
("Failed to register NFS lock locally - error=%d", error));
|
|
}
|
|
|
|
static int
|
|
nlm_setlock(struct nlm_host *host, struct rpc_callextra *ext,
|
|
rpcvers_t vers, struct timeval *timo, int retries,
|
|
struct vnode *vp, int op, struct flock *fl, int flags,
|
|
int svid, size_t fhlen, void *fh, off_t size, bool_t reclaim)
|
|
{
|
|
struct nlm4_lockargs args;
|
|
char oh_space[32];
|
|
struct nlm4_res res;
|
|
u_int xid;
|
|
CLIENT *client;
|
|
enum clnt_stat stat;
|
|
int retry, block, exclusive;
|
|
void *wait_handle = NULL;
|
|
int error;
|
|
|
|
memset(&args, 0, sizeof(args));
|
|
memset(&res, 0, sizeof(res));
|
|
|
|
block = (flags & F_WAIT) ? TRUE : FALSE;
|
|
exclusive = (fl->l_type == F_WRLCK);
|
|
|
|
error = nlm_init_lock(fl, flags, svid, vers, fhlen, fh, size,
|
|
&args.alock, oh_space);
|
|
if (error)
|
|
return (error);
|
|
args.block = block;
|
|
args.exclusive = exclusive;
|
|
args.reclaim = reclaim;
|
|
args.state = nlm_nsm_state;
|
|
|
|
retry = 5*hz;
|
|
for (;;) {
|
|
client = nlm_host_get_rpc(host, FALSE);
|
|
if (!client)
|
|
return (ENOLCK); /* XXX retry? */
|
|
|
|
if (block)
|
|
wait_handle = nlm_register_wait_lock(&args.alock, vp);
|
|
|
|
xid = atomic_fetchadd_int(&nlm_xid, 1);
|
|
args.cookie.n_len = sizeof(xid);
|
|
args.cookie.n_bytes = (char*) &xid;
|
|
|
|
stat = nlm_lock_rpc(vers, &args, &res, client, ext, *timo);
|
|
|
|
CLNT_RELEASE(client);
|
|
|
|
if (stat != RPC_SUCCESS) {
|
|
if (block)
|
|
nlm_deregister_wait_lock(wait_handle);
|
|
if (retries) {
|
|
retries--;
|
|
continue;
|
|
}
|
|
return (EINVAL);
|
|
}
|
|
|
|
/*
|
|
* Free res.cookie.
|
|
*/
|
|
xdr_free((xdrproc_t) xdr_nlm4_res, &res);
|
|
|
|
if (block && res.stat.stat != nlm4_blocked)
|
|
nlm_deregister_wait_lock(wait_handle);
|
|
|
|
if (res.stat.stat == nlm4_denied_grace_period) {
|
|
/*
|
|
* The server has recently rebooted and is
|
|
* giving old clients a change to reclaim
|
|
* their locks. Wait for a few seconds and try
|
|
* again.
|
|
*/
|
|
error = tsleep(&args, PCATCH, "nlmgrace", retry);
|
|
if (error && error != EWOULDBLOCK)
|
|
return (error);
|
|
retry = 2*retry;
|
|
if (retry > 30*hz)
|
|
retry = 30*hz;
|
|
continue;
|
|
}
|
|
|
|
if (block && res.stat.stat == nlm4_blocked) {
|
|
/*
|
|
* The server should call us back with a
|
|
* granted message when the lock succeeds. In
|
|
* order to deal with broken servers, lost
|
|
* granted messages and server reboots, we
|
|
* will also re-try every few seconds.
|
|
*/
|
|
error = nlm_wait_lock(wait_handle, retry);
|
|
if (error == EWOULDBLOCK) {
|
|
retry = 2*retry;
|
|
if (retry > 30*hz)
|
|
retry = 30*hz;
|
|
continue;
|
|
}
|
|
if (error) {
|
|
/*
|
|
* We need to call the server to
|
|
* cancel our lock request.
|
|
*/
|
|
nlm4_cancargs cancel;
|
|
|
|
memset(&cancel, 0, sizeof(cancel));
|
|
|
|
xid = atomic_fetchadd_int(&nlm_xid, 1);
|
|
cancel.cookie.n_len = sizeof(xid);
|
|
cancel.cookie.n_bytes = (char*) &xid;
|
|
cancel.block = block;
|
|
cancel.exclusive = exclusive;
|
|
cancel.alock = args.alock;
|
|
|
|
do {
|
|
client = nlm_host_get_rpc(host, FALSE);
|
|
if (!client)
|
|
/* XXX retry? */
|
|
return (ENOLCK);
|
|
|
|
stat = nlm_cancel_rpc(vers, &cancel,
|
|
&res, client, ext, *timo);
|
|
|
|
CLNT_RELEASE(client);
|
|
|
|
if (stat != RPC_SUCCESS) {
|
|
/*
|
|
* We need to cope
|
|
* with temporary
|
|
* network partitions
|
|
* as well as server
|
|
* reboots. This means
|
|
* we have to keep
|
|
* trying to cancel
|
|
* until the server
|
|
* wakes up again.
|
|
*/
|
|
pause("nlmcancel", 10*hz);
|
|
}
|
|
} while (stat != RPC_SUCCESS);
|
|
|
|
/*
|
|
* Free res.cookie.
|
|
*/
|
|
xdr_free((xdrproc_t) xdr_nlm4_res, &res);
|
|
|
|
switch (res.stat.stat) {
|
|
case nlm_denied:
|
|
/*
|
|
* There was nothing
|
|
* to cancel. We are
|
|
* going to go ahead
|
|
* and assume we got
|
|
* the lock.
|
|
*/
|
|
error = 0;
|
|
break;
|
|
|
|
case nlm4_denied_grace_period:
|
|
/*
|
|
* The server has
|
|
* recently rebooted -
|
|
* treat this as a
|
|
* successful
|
|
* cancellation.
|
|
*/
|
|
break;
|
|
|
|
case nlm4_granted:
|
|
/*
|
|
* We managed to
|
|
* cancel.
|
|
*/
|
|
break;
|
|
|
|
default:
|
|
/*
|
|
* Broken server
|
|
* implementation -
|
|
* can't really do
|
|
* anything here.
|
|
*/
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
error = nlm_map_status(res.stat.stat);
|
|
}
|
|
|
|
if (!error && !reclaim) {
|
|
nlm_record_lock(vp, op, fl, args.alock.svid,
|
|
nlm_host_get_sysid(host), size);
|
|
nlm_host_monitor(host, 0);
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
}
|
|
|
|
static int
|
|
nlm_clearlock(struct nlm_host *host, struct rpc_callextra *ext,
|
|
rpcvers_t vers, struct timeval *timo, int retries,
|
|
struct vnode *vp, int op, struct flock *fl, int flags,
|
|
int svid, size_t fhlen, void *fh, off_t size)
|
|
{
|
|
struct nlm4_unlockargs args;
|
|
char oh_space[32];
|
|
struct nlm4_res res;
|
|
u_int xid;
|
|
CLIENT *client;
|
|
enum clnt_stat stat;
|
|
int error;
|
|
|
|
memset(&args, 0, sizeof(args));
|
|
memset(&res, 0, sizeof(res));
|
|
|
|
error = nlm_init_lock(fl, flags, svid, vers, fhlen, fh, size,
|
|
&args.alock, oh_space);
|
|
if (error)
|
|
return (error);
|
|
|
|
for (;;) {
|
|
client = nlm_host_get_rpc(host, FALSE);
|
|
if (!client)
|
|
return (ENOLCK); /* XXX retry? */
|
|
|
|
xid = atomic_fetchadd_int(&nlm_xid, 1);
|
|
args.cookie.n_len = sizeof(xid);
|
|
args.cookie.n_bytes = (char*) &xid;
|
|
|
|
stat = nlm_unlock_rpc(vers, &args, &res, client, ext, *timo);
|
|
|
|
CLNT_RELEASE(client);
|
|
|
|
if (stat != RPC_SUCCESS) {
|
|
if (retries) {
|
|
retries--;
|
|
continue;
|
|
}
|
|
return (EINVAL);
|
|
}
|
|
|
|
/*
|
|
* Free res.cookie.
|
|
*/
|
|
xdr_free((xdrproc_t) xdr_nlm4_res, &res);
|
|
|
|
if (res.stat.stat == nlm4_denied_grace_period) {
|
|
/*
|
|
* The server has recently rebooted and is
|
|
* giving old clients a change to reclaim
|
|
* their locks. Wait for a few seconds and try
|
|
* again.
|
|
*/
|
|
error = tsleep(&args, PCATCH, "nlmgrace", 5*hz);
|
|
if (error && error != EWOULDBLOCK)
|
|
return (error);
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* If we are being called via nlm_reclaim (which will
|
|
* use the F_REMOTE flag), don't record the lock
|
|
* operation in the local lock manager since the vnode
|
|
* is going away.
|
|
*/
|
|
if (!(flags & F_REMOTE))
|
|
nlm_record_lock(vp, op, fl, args.alock.svid,
|
|
nlm_host_get_sysid(host), size);
|
|
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
static int
|
|
nlm_getlock(struct nlm_host *host, struct rpc_callextra *ext,
|
|
rpcvers_t vers, struct timeval *timo, int retries,
|
|
struct vnode *vp, int op, struct flock *fl, int flags,
|
|
int svid, size_t fhlen, void *fh, off_t size)
|
|
{
|
|
struct nlm4_testargs args;
|
|
char oh_space[32];
|
|
struct nlm4_testres res;
|
|
u_int xid;
|
|
CLIENT *client;
|
|
enum clnt_stat stat;
|
|
int exclusive;
|
|
int error;
|
|
|
|
KASSERT(!(flags & F_FLOCK), ("unexpected F_FLOCK for F_GETLK"));
|
|
|
|
memset(&args, 0, sizeof(args));
|
|
memset(&res, 0, sizeof(res));
|
|
|
|
exclusive = (fl->l_type == F_WRLCK);
|
|
|
|
error = nlm_init_lock(fl, flags, svid, vers, fhlen, fh, size,
|
|
&args.alock, oh_space);
|
|
if (error)
|
|
return (error);
|
|
args.exclusive = exclusive;
|
|
|
|
for (;;) {
|
|
client = nlm_host_get_rpc(host, FALSE);
|
|
if (!client)
|
|
return (ENOLCK); /* XXX retry? */
|
|
|
|
xid = atomic_fetchadd_int(&nlm_xid, 1);
|
|
args.cookie.n_len = sizeof(xid);
|
|
args.cookie.n_bytes = (char*) &xid;
|
|
|
|
stat = nlm_test_rpc(vers, &args, &res, client, ext, *timo);
|
|
|
|
CLNT_RELEASE(client);
|
|
|
|
if (stat != RPC_SUCCESS) {
|
|
if (retries) {
|
|
retries--;
|
|
continue;
|
|
}
|
|
return (EINVAL);
|
|
}
|
|
|
|
if (res.stat.stat == nlm4_denied_grace_period) {
|
|
/*
|
|
* The server has recently rebooted and is
|
|
* giving old clients a change to reclaim
|
|
* their locks. Wait for a few seconds and try
|
|
* again.
|
|
*/
|
|
xdr_free((xdrproc_t) xdr_nlm4_testres, &res);
|
|
error = tsleep(&args, PCATCH, "nlmgrace", 5*hz);
|
|
if (error && error != EWOULDBLOCK)
|
|
return (error);
|
|
continue;
|
|
}
|
|
|
|
if (res.stat.stat == nlm4_denied) {
|
|
struct nlm4_holder *h =
|
|
&res.stat.nlm4_testrply_u.holder;
|
|
fl->l_start = h->l_offset;
|
|
fl->l_len = h->l_len;
|
|
fl->l_pid = h->svid;
|
|
if (h->exclusive)
|
|
fl->l_type = F_WRLCK;
|
|
else
|
|
fl->l_type = F_RDLCK;
|
|
fl->l_whence = SEEK_SET;
|
|
fl->l_sysid = 0;
|
|
} else {
|
|
fl->l_type = F_UNLCK;
|
|
}
|
|
|
|
xdr_free((xdrproc_t) xdr_nlm4_testres, &res);
|
|
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
static int
|
|
nlm_map_status(nlm4_stats stat)
|
|
{
|
|
switch (stat) {
|
|
case nlm4_granted:
|
|
return (0);
|
|
|
|
case nlm4_denied:
|
|
return (EAGAIN);
|
|
|
|
case nlm4_denied_nolocks:
|
|
return (ENOLCK);
|
|
|
|
case nlm4_deadlck:
|
|
return (EDEADLK);
|
|
|
|
case nlm4_rofs:
|
|
return (EROFS);
|
|
|
|
case nlm4_stale_fh:
|
|
return (ESTALE);
|
|
|
|
case nlm4_fbig:
|
|
return (EFBIG);
|
|
|
|
case nlm4_failed:
|
|
return (EACCES);
|
|
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
}
|
|
|
|
static struct nlm_file_svid *
|
|
nlm_find_svid(void *id)
|
|
{
|
|
struct nlm_file_svid *ns, *newns;
|
|
int h;
|
|
|
|
h = (((uintptr_t) id) >> 7) % NLM_SVID_HASH_SIZE;
|
|
|
|
mtx_lock(&nlm_svid_lock);
|
|
LIST_FOREACH(ns, &nlm_file_svids[h], ns_link) {
|
|
if (ns->ns_id == id) {
|
|
ns->ns_refs++;
|
|
break;
|
|
}
|
|
}
|
|
mtx_unlock(&nlm_svid_lock);
|
|
if (!ns) {
|
|
int svid = alloc_unr(nlm_svid_allocator);
|
|
newns = malloc(sizeof(struct nlm_file_svid), M_NLM,
|
|
M_WAITOK);
|
|
newns->ns_refs = 1;
|
|
newns->ns_id = id;
|
|
newns->ns_svid = svid;
|
|
newns->ns_ucred = NULL;
|
|
newns->ns_active = FALSE;
|
|
|
|
/*
|
|
* We need to check for a race with some other
|
|
* thread allocating a svid for this file.
|
|
*/
|
|
mtx_lock(&nlm_svid_lock);
|
|
LIST_FOREACH(ns, &nlm_file_svids[h], ns_link) {
|
|
if (ns->ns_id == id) {
|
|
ns->ns_refs++;
|
|
break;
|
|
}
|
|
}
|
|
if (ns) {
|
|
mtx_unlock(&nlm_svid_lock);
|
|
free_unr(nlm_svid_allocator, newns->ns_svid);
|
|
free(newns, M_NLM);
|
|
} else {
|
|
LIST_INSERT_HEAD(&nlm_file_svids[h], newns,
|
|
ns_link);
|
|
ns = newns;
|
|
mtx_unlock(&nlm_svid_lock);
|
|
}
|
|
}
|
|
|
|
return (ns);
|
|
}
|
|
|
|
static void
|
|
nlm_free_svid(struct nlm_file_svid *ns)
|
|
{
|
|
|
|
mtx_lock(&nlm_svid_lock);
|
|
ns->ns_refs--;
|
|
if (!ns->ns_refs) {
|
|
KASSERT(!ns->ns_active, ("Freeing active SVID"));
|
|
LIST_REMOVE(ns, ns_link);
|
|
mtx_unlock(&nlm_svid_lock);
|
|
free_unr(nlm_svid_allocator, ns->ns_svid);
|
|
if (ns->ns_ucred)
|
|
crfree(ns->ns_ucred);
|
|
free(ns, M_NLM);
|
|
} else {
|
|
mtx_unlock(&nlm_svid_lock);
|
|
}
|
|
}
|
|
|
|
static int
|
|
nlm_init_lock(struct flock *fl, int flags, int svid,
|
|
rpcvers_t vers, size_t fhlen, void *fh, off_t size,
|
|
struct nlm4_lock *lock, char oh_space[32])
|
|
{
|
|
size_t oh_len;
|
|
off_t start, len;
|
|
|
|
if (fl->l_whence == SEEK_END) {
|
|
if (size > OFF_MAX
|
|
|| (fl->l_start > 0 && size > OFF_MAX - fl->l_start))
|
|
return (EOVERFLOW);
|
|
start = size + fl->l_start;
|
|
} else if (fl->l_whence == SEEK_SET || fl->l_whence == SEEK_CUR) {
|
|
start = fl->l_start;
|
|
} else {
|
|
return (EINVAL);
|
|
}
|
|
if (start < 0)
|
|
return (EINVAL);
|
|
if (fl->l_len < 0) {
|
|
len = -fl->l_len;
|
|
start -= len;
|
|
if (start < 0)
|
|
return (EINVAL);
|
|
} else {
|
|
len = fl->l_len;
|
|
}
|
|
|
|
if (vers == NLM_VERS) {
|
|
/*
|
|
* Enforce range limits on V1 locks
|
|
*/
|
|
if (start > 0xffffffffLL || len > 0xffffffffLL)
|
|
return (EOVERFLOW);
|
|
}
|
|
|
|
snprintf(oh_space, 32, "%d@", svid);
|
|
oh_len = strlen(oh_space);
|
|
getcredhostname(NULL, oh_space + oh_len, 32 - oh_len);
|
|
oh_len = strlen(oh_space);
|
|
|
|
memset(lock, 0, sizeof(*lock));
|
|
lock->caller_name = prison0.pr_hostname;
|
|
lock->fh.n_len = fhlen;
|
|
lock->fh.n_bytes = fh;
|
|
lock->oh.n_len = oh_len;
|
|
lock->oh.n_bytes = oh_space;
|
|
lock->svid = svid;
|
|
lock->l_offset = start;
|
|
lock->l_len = len;
|
|
|
|
return (0);
|
|
}
|