X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/6601e61aa18bf4f09af135ff61fc7f4771d23b06..eb6b6ca394357805f2bdba989abae309f718b4d8:/bsd/nfs/nfs_lock.c?ds=sidebyside diff --git a/bsd/nfs/nfs_lock.c b/bsd/nfs/nfs_lock.c index 762c140b0..352e1b61e 100644 --- a/bsd/nfs/nfs_lock.c +++ b/bsd/nfs/nfs_lock.c @@ -1,23 +1,29 @@ /* - * Copyright (c) 2002-2005 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2002-2016 Apple Inc. All rights reserved. * - * @APPLE_LICENSE_HEADER_START@ - * - * The contents of this file constitute Original Code as defined in and - * are subject to the Apple Public Source License Version 1.1 (the - * "License"). You may not use this file except in compliance with the - * License. Please obtain a copy of the License at - * http://www.apple.com/publicsource and read it before using this file. - * - * This Original Code and all software distributed under the License are - * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER + * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ + * + * This file contains Original Code and/or Modifications of Original Code + * as defined in and that are subject to the Apple Public Source License + * Version 2.0 (the 'License'). You may not use this file except in + * compliance with the License. The rights granted to you under the License + * may not be used to create, or enable the creation or redistribution of, + * unlawful or unlicensed copies of an Apple operating system, or to + * circumvent, violate, or enable the circumvention or violation of, any + * terms of an Apple operating system software license agreement. + * + * Please obtain a copy of the License at + * http://www.opensource.apple.com/apsl/ and read it before using this file. + * + * The Original Code and all software distributed under the License are + * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the - * License for the specific language governing rights and limitations - * under the License. - * - * @APPLE_LICENSE_HEADER_END@ + * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. + * Please see the License for the specific language governing rights and + * limitations under the License. + * + * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /*- * Copyright (c) 1997 Berkeley Software Design, Inc. All rights reserved. @@ -49,17 +55,20 @@ * from BSDI nfs_lock.c,v 2.4 1998/12/14 23:49:56 jch Exp */ +#include +#if CONFIG_NFS_CLIENT + #include #include #include #include -#include /* for hz */ +#include /* for hz */ #include #include -#include /* for hz */ /* Must come after sys/malloc.h */ +#include /* for hz */ /* Must come after sys/malloc.h */ #include #include -#include /* for p_start */ +#include /* for p_start */ #include #include #include @@ -68,6 +77,7 @@ #include #include +#include #include @@ -76,52 +86,38 @@ #include #include #include +#include #include #include #include -#define OFF_MAX QUAD_MAX +#include +#include +#include +#include -/* - * globals for managing the lockd fifo - */ -vnode_t nfslockdvnode = 0; -int nfslockdwaiting = 0; -time_t nfslockdstarttimeout = 0; -int nfslockdfifolock = 0; -#define NFSLOCKDFIFOLOCK_LOCKED 1 -#define NFSLOCKDFIFOLOCK_WANT 2 +extern void ipc_port_release_send(ipc_port_t); /* * pending lock request messages are kept in this queue which is * kept sorted by transaction ID (xid). */ -uint64_t nfs_lockxid = 0; -LOCKD_MSG_QUEUE nfs_pendlockq; +static uint64_t nfs_lockxid = 0; +static LOCKD_MSG_QUEUE nfs_pendlockq; -/* - * This structure is used to identify processes which have acquired NFS locks. - * Knowing which processes have ever acquired locks allows us to short-circuit - * unlock requests for processes that have never had an NFS file lock. Thus - * avoiding a costly and unnecessary lockd request. - */ -struct nfs_lock_pid { - TAILQ_ENTRY(nfs_lock_pid) lp_lru; /* LRU list */ - LIST_ENTRY(nfs_lock_pid) lp_hash; /* hash chain */ - int lp_valid; /* valid entry? */ - int lp_time; /* last time seen valid */ - pid_t lp_pid; /* The process ID. */ - struct timeval lp_pid_start; /* Start time of process id */ -}; - -#define NFS_LOCK_PID_HASH_SIZE 64 // XXX tune me -#define NFS_LOCK_PID_HASH(pid) \ - (&nfs_lock_pid_hash_tbl[(pid) & nfs_lock_pid_hash]) -LIST_HEAD(, nfs_lock_pid) *nfs_lock_pid_hash_tbl; -TAILQ_HEAD(, nfs_lock_pid) nfs_lock_pid_lru; -u_long nfs_lock_pid_hash; -int nfs_lock_pid_lock; +/* list of mounts that are (potentially) making lockd requests */ +TAILQ_HEAD(nfs_lockd_mount_list, nfsmount) nfs_lockd_mount_list; + +static lck_grp_t *nfs_lock_lck_grp; +static lck_mtx_t *nfs_lock_mutex; +void nfs_lockdmsg_enqueue(LOCKD_MSG_REQUEST *); +void nfs_lockdmsg_dequeue(LOCKD_MSG_REQUEST *); +int nfs_lockdmsg_compare_to_answer(LOCKD_MSG_REQUEST *, struct lockd_ans *); +LOCKD_MSG_REQUEST *nfs_lockdmsg_find_by_answer(struct lockd_ans *); +LOCKD_MSG_REQUEST *nfs_lockdmsg_find_by_xid(uint64_t); +uint64_t nfs_lockxid_get(void); +int nfs_lockd_send_request(LOCKD_MSG *, int); /* * initialize global nfs lock state @@ -130,16 +126,84 @@ void nfs_lockinit(void) { TAILQ_INIT(&nfs_pendlockq); - nfs_lock_pid_lock = 0; - nfs_lock_pid_hash_tbl = hashinit(NFS_LOCK_PID_HASH_SIZE, - M_TEMP, &nfs_lock_pid_hash); - TAILQ_INIT(&nfs_lock_pid_lru); + TAILQ_INIT(&nfs_lockd_mount_list); + + nfs_lock_lck_grp = lck_grp_alloc_init("nfs_lock", LCK_GRP_ATTR_NULL); + nfs_lock_mutex = lck_mtx_alloc_init(nfs_lock_lck_grp, LCK_ATTR_NULL); +} + +/* + * Register a mount as (potentially) making lockd requests. + */ +void +nfs_lockd_mount_register(struct nfsmount *nmp) +{ + lck_mtx_lock(nfs_lock_mutex); + TAILQ_INSERT_HEAD(&nfs_lockd_mount_list, nmp, nm_ldlink); + nfs_lockd_mounts++; + lck_mtx_unlock(nfs_lock_mutex); +} + +/* + * Unregister a mount as (potentially) making lockd requests. + * + * When the lockd mount count drops to zero, then send a shutdown request to + * lockd if we've sent any requests to it. + */ +void +nfs_lockd_mount_unregister(struct nfsmount *nmp) +{ + int send_shutdown; + mach_port_t lockd_port = IPC_PORT_NULL; + kern_return_t kr; + + lck_mtx_lock(nfs_lock_mutex); + if (nmp->nm_ldlink.tqe_next == NFSNOLIST) { + lck_mtx_unlock(nfs_lock_mutex); + return; + } + + TAILQ_REMOVE(&nfs_lockd_mount_list, nmp, nm_ldlink); + nmp->nm_ldlink.tqe_next = NFSNOLIST; + + nfs_lockd_mounts--; + + /* send a shutdown request if there are no more lockd mounts */ + send_shutdown = ((nfs_lockd_mounts == 0) && nfs_lockd_request_sent); + if (send_shutdown) { + nfs_lockd_request_sent = 0; + } + + lck_mtx_unlock(nfs_lock_mutex); + + if (!send_shutdown) { + return; + } + + /* + * Let lockd know that it is no longer needed for any NFS mounts + */ + kr = host_get_lockd_port(host_priv_self(), &lockd_port); + if ((kr != KERN_SUCCESS) || !IPC_PORT_VALID(lockd_port)) { + printf("nfs_lockd_mount_change: shutdown couldn't get port, kr %d, port %s\n", + kr, (lockd_port == IPC_PORT_NULL) ? "NULL" : + (lockd_port == IPC_PORT_DEAD) ? "DEAD" : "VALID"); + return; + } + + kr = lockd_shutdown(lockd_port); + if (kr != KERN_SUCCESS) { + printf("nfs_lockd_mount_change: shutdown %d\n", kr); + } + + ipc_port_release_send(lockd_port); } /* * insert a lock request message into the pending queue + * (nfs_lock_mutex must be held) */ -static inline void +void nfs_lockdmsg_enqueue(LOCKD_MSG_REQUEST *msgreq) { LOCKD_MSG_REQUEST *mr; @@ -163,8 +227,9 @@ nfs_lockdmsg_enqueue(LOCKD_MSG_REQUEST *msgreq) /* * remove a lock request message from the pending queue + * (nfs_lock_mutex must be held) */ -static inline void +void nfs_lockdmsg_dequeue(LOCKD_MSG_REQUEST *msgreq) { TAILQ_REMOVE(&nfs_pendlockq, msgreq, lmr_next); @@ -179,25 +244,29 @@ nfs_lockdmsg_dequeue(LOCKD_MSG_REQUEST *msgreq) * However, this may not be the case if there are blocked requests. We may * want to move blocked requests to a separate queue (but that'll complicate * duplicate xid checking). + * + * (nfs_lock_mutex must be held) */ -static inline LOCKD_MSG_REQUEST * +LOCKD_MSG_REQUEST * nfs_lockdmsg_find_by_xid(uint64_t lockxid) { LOCKD_MSG_REQUEST *mr; TAILQ_FOREACH(mr, &nfs_pendlockq, lmr_next) { - if (mr->lmr_msg.lm_xid == lockxid) + if (mr->lmr_msg.lm_xid == lockxid) { return mr; - if (mr->lmr_msg.lm_xid > lockxid) + } + if (mr->lmr_msg.lm_xid > lockxid) { return NULL; + } } return mr; } /* * Because we can't depend on nlm_granted messages containing the same - * cookie we sent with the original lock request, we need code test if - * an nlm_granted answer matches the lock request. We also need code + * cookie we sent with the original lock request, we need code to test + * if an nlm_granted answer matches the lock request. We also need code * that can find a lockd message based solely on the nlm_granted answer. */ @@ -206,21 +275,27 @@ nfs_lockdmsg_find_by_xid(uint64_t lockxid) * * returns 0 on equality and 1 if different */ -static inline int +int nfs_lockdmsg_compare_to_answer(LOCKD_MSG_REQUEST *msgreq, struct lockd_ans *ansp) { - if (!(ansp->la_flags & LOCKD_ANS_LOCK_INFO)) + if (!(ansp->la_flags & LOCKD_ANS_LOCK_INFO)) { return 1; - if (msgreq->lmr_msg.lm_fl.l_pid != ansp->la_pid) + } + if (msgreq->lmr_msg.lm_fl.l_pid != ansp->la_pid) { return 1; - if (msgreq->lmr_msg.lm_fl.l_start != ansp->la_start) + } + if (msgreq->lmr_msg.lm_fl.l_start != ansp->la_start) { return 1; - if (msgreq->lmr_msg.lm_fl.l_len != ansp->la_len) + } + if (msgreq->lmr_msg.lm_fl.l_len != ansp->la_len) { return 1; - if (msgreq->lmr_msg.lm_fh_len != ansp->la_fh_len) + } + if (msgreq->lmr_msg.lm_fh_len != ansp->la_fh_len) { return 1; - if (bcmp(msgreq->lmr_msg.lm_fh, ansp->la_fh, ansp->la_fh_len)) + } + if (bcmp(msgreq->lmr_msg.lm_fh, ansp->la_fh, ansp->la_fh_len)) { return 1; + } return 0; } @@ -236,25 +311,30 @@ nfs_lockdmsg_compare_to_answer(LOCKD_MSG_REQUEST *msgreq, struct lockd_ans *ansp * However, this may not be the case if there are blocked requests. We may * want to move blocked requests to a separate queue (but that'll complicate * duplicate xid checking). + * + * (nfs_lock_mutex must be held) */ -static inline LOCKD_MSG_REQUEST * +LOCKD_MSG_REQUEST * nfs_lockdmsg_find_by_answer(struct lockd_ans *ansp) { LOCKD_MSG_REQUEST *mr; - if (!(ansp->la_flags & LOCKD_ANS_LOCK_INFO)) + if (!(ansp->la_flags & LOCKD_ANS_LOCK_INFO)) { return NULL; + } TAILQ_FOREACH(mr, &nfs_pendlockq, lmr_next) { - if (!nfs_lockdmsg_compare_to_answer(mr, ansp)) + if (!nfs_lockdmsg_compare_to_answer(mr, ansp)) { break; + } } return mr; } /* * return the next unique lock request transaction ID + * (nfs_lock_mutex must be held) */ -static inline uint64_t +uint64_t nfs_lockxid_get(void) { LOCKD_MSG_REQUEST *mr; @@ -275,10 +355,11 @@ nfs_lockxid_get(void) /* make sure we get a unique xid */ do { /* Skip zero xid if it should ever happen. */ - if (++nfs_lockxid == 0) + if (++nfs_lockxid == 0) { nfs_lockxid++; + } if (!(mr = TAILQ_LAST(&nfs_pendlockq, nfs_lock_msg_queue)) || - (mr->lmr_msg.lm_xid < nfs_lockxid)) { + (mr->lmr_msg.lm_xid < nfs_lockxid)) { /* fast path: empty queue or new largest xid */ break; } @@ -288,406 +369,115 @@ nfs_lockxid_get(void) return nfs_lockxid; } +#define MACH_MAX_TRIES 3 -/* - * Check the nfs_lock_pid hash table for an entry and, if requested, - * add the entry if it is not found. - * - * (Also, if adding, try to clean up some stale entries.) - */ -static int -nfs_lock_pid_check(proc_t p, int addflag, vnode_t vp) +int +nfs_lockd_send_request(LOCKD_MSG *msg, int interruptable) { - struct nfs_lock_pid *lp, *lplru, *lplru_next; - proc_t plru; - int error = 0; - struct timeval now; + kern_return_t kr; + int retries = 0; + mach_port_t lockd_port = IPC_PORT_NULL; - /* lock hash */ -loop: - if (nfs_lock_pid_lock) { - struct nfsmount *nmp = VFSTONFS(vnode_mount(vp)); - while (nfs_lock_pid_lock) { - nfs_lock_pid_lock = -1; - tsleep(&nfs_lock_pid_lock, PCATCH, "nfslockpid", 0); - if ((error = nfs_sigintr(nmp, NULL, p))) - return (error); - } - goto loop; + kr = host_get_lockd_port(host_priv_self(), &lockd_port); + if (kr != KERN_SUCCESS || !IPC_PORT_VALID(lockd_port)) { + return ENOTSUP; } - nfs_lock_pid_lock = 1; - - /* Search hash chain */ - error = ENOENT; - lp = NFS_LOCK_PID_HASH(proc_pid(p))->lh_first; - for (; lp != NULL; lp = lp->lp_hash.le_next) - if (lp->lp_pid == proc_pid(p)) { - /* found pid... */ - if (timevalcmp(&lp->lp_pid_start, &p->p_stats->p_start, ==)) { - /* ...and it's valid */ - /* move to tail of LRU */ - TAILQ_REMOVE(&nfs_lock_pid_lru, lp, lp_lru); - microuptime(&now); - lp->lp_time = now.tv_sec; - TAILQ_INSERT_TAIL(&nfs_lock_pid_lru, lp, lp_lru); - error = 0; - break; - } - /* ...but it's no longer valid */ - /* remove from hash, invalidate, and move to lru head */ - LIST_REMOVE(lp, lp_hash); - lp->lp_valid = 0; - TAILQ_REMOVE(&nfs_lock_pid_lru, lp, lp_lru); - TAILQ_INSERT_HEAD(&nfs_lock_pid_lru, lp, lp_lru); - lp = NULL; - break; - } - /* if we didn't find it (valid) and we've been asked to add it */ - if ((error == ENOENT) && addflag) { - /* scan lru list for invalid, stale entries to reuse/free */ - int lrucnt = 0; - microuptime(&now); - for (lplru = TAILQ_FIRST(&nfs_lock_pid_lru); lplru; lplru = lplru_next) { - lplru_next = TAILQ_NEXT(lplru, lp_lru); - if (lplru->lp_valid && (lplru->lp_time >= (now.tv_sec - 2))) { - /* - * If the oldest LRU entry is relatively new, then don't - * bother scanning any further. - */ - break; - } - /* remove entry from LRU, and check if it's still in use */ - TAILQ_REMOVE(&nfs_lock_pid_lru, lplru, lp_lru); - if (!lplru->lp_valid || !(plru = pfind(lplru->lp_pid)) || - timevalcmp(&lplru->lp_pid_start, &plru->p_stats->p_start, !=)) { - /* no longer in use */ - LIST_REMOVE(lplru, lp_hash); - if (!lp) { - /* we'll reuse this one */ - lp = lplru; - } else { - /* we can free this one */ - FREE(lplru, M_TEMP); - } - } else { - /* still in use */ - lplru->lp_time = now.tv_sec; - TAILQ_INSERT_TAIL(&nfs_lock_pid_lru, lplru, lp_lru); + do { + /* In the kernel all mach messaging is interruptable */ + do { + kr = lockd_request( + lockd_port, + msg->lm_version, + msg->lm_flags, + msg->lm_xid, + msg->lm_fl.l_start, + msg->lm_fl.l_len, + msg->lm_fl.l_pid, + msg->lm_fl.l_type, + msg->lm_fl.l_whence, + (uint32_t *)&msg->lm_addr, + (uint32_t *)&msg->lm_cred, + msg->lm_fh_len, + msg->lm_fh); + if (kr != KERN_SUCCESS) { + printf("lockd_request received %d!\n", kr); } - /* don't check too many entries at once */ - if (++lrucnt > 8) - break; - } - if (!lp) { - /* we need to allocate a new one */ - MALLOC(lp, struct nfs_lock_pid *, sizeof(struct nfs_lock_pid), - M_TEMP, M_WAITOK | M_ZERO); - } - if (!lp) { - error = ENOMEM; - } else { - /* (re)initialize nfs_lock_pid info */ - lp->lp_pid = proc_pid(p); - lp->lp_pid_start = p->p_stats->p_start; - /* insert pid in hash */ - LIST_INSERT_HEAD(NFS_LOCK_PID_HASH(lp->lp_pid), lp, lp_hash); - lp->lp_valid = 1; - lp->lp_time = now.tv_sec; - TAILQ_INSERT_TAIL(&nfs_lock_pid_lru, lp, lp_lru); - error = 0; - } - } - - /* unlock hash */ - if (nfs_lock_pid_lock < 0) { - nfs_lock_pid_lock = 0; - wakeup(&nfs_lock_pid_lock); - } else - nfs_lock_pid_lock = 0; + } while (!interruptable && kr == MACH_SEND_INTERRUPTED); + } while (kr == MIG_SERVER_DIED && retries++ < MACH_MAX_TRIES); - return (error); + ipc_port_release_send(lockd_port); + switch (kr) { + case MACH_SEND_INTERRUPTED: + return EINTR; + default: + /* + * Other MACH or MIG errors we will retry. Eventually + * we will call nfs_down and allow the user to disable + * locking. + */ + return EAGAIN; + } } - /* - * nfs_advlock -- - * NFS advisory byte-level locks. + * NFS advisory byte-level locks (client) */ int -nfs_dolock(struct vnop_advlock_args *ap) -/* struct vnop_advlock_args { - struct vnodeop_desc *a_desc; - vnode_t a_vp; - caddr_t a_id; - int a_op; - struct flock *a_fl; - int a_flags; - vfs_context_t a_context; -}; */ +nfs3_lockd_request( + nfsnode_t np, + int type, + LOCKD_MSG_REQUEST *msgreq, + int flags, + thread_t thd) { - LOCKD_MSG_REQUEST msgreq; - LOCKD_MSG *msg; - vnode_t vp, wvp; - struct nfsnode *np; - int error, error1; - struct flock *fl; - int fmode, ioflg; + LOCKD_MSG *msg = &msgreq->lmr_msg; + int error, error2; + int interruptable, slpflag; struct nfsmount *nmp; - struct nfs_vattr nvattr; - off_t start, end; struct timeval now; - int timeo, endtime, lastmsg, wentdown = 0; - int lockpidcheck; - kauth_cred_t cred; - proc_t p; + int timeo, starttime, endtime, lastmsg, wentdown = 0; + struct timespec ts; struct sockaddr *saddr; - p = vfs_context_proc(ap->a_context); - cred = vfs_context_ucred(ap->a_context); - - vp = ap->a_vp; - fl = ap->a_fl; - np = VTONFS(vp); - - nmp = VFSTONFS(vnode_mount(vp)); - if (!nmp) - return (ENXIO); - if (nmp->nm_flag & NFSMNT_NOLOCKS) - return (ENOTSUP); - - /* - * The NLM protocol doesn't allow the server to return an error - * on ranges, so we do it. Pre LFS (Large File Summit) - * standards required EINVAL for the range errors. More recent - * standards use EOVERFLOW, but their EINVAL wording still - * encompasses these errors. - * Any code sensitive to this is either: - * 1) written pre-LFS and so can handle only EINVAL, or - * 2) written post-LFS and thus ought to be tolerant of pre-LFS - * implementations. - * Since returning EOVERFLOW certainly breaks 1), we return EINVAL. - */ - if (fl->l_whence != SEEK_END) { - if ((fl->l_whence != SEEK_CUR && fl->l_whence != SEEK_SET) || - fl->l_start < 0 || - (fl->l_len > 0 && fl->l_len - 1 > OFF_MAX - fl->l_start) || - (fl->l_len < 0 && fl->l_start + fl->l_len < 0)) - return (EINVAL); - } - /* - * If daemon is running take a ref on its fifo vnode - */ - if (!(wvp = nfslockdvnode)) { - if (!nfslockdwaiting && !nfslockdstarttimeout) - return (ENOTSUP); - /* - * Don't wake lock daemon if it hasn't been started yet and - * this is an unlock request (since we couldn't possibly - * actually have a lock on the file). This could be an - * uninformed unlock request due to closef()'s behavior of doing - * unlocks on all files if a process has had a lock on ANY file. - */ - if (!nfslockdvnode && (fl->l_type == F_UNLCK)) - return (EINVAL); - microuptime(&now); - if (nfslockdwaiting) { - /* wake up lock daemon */ - nfslockdstarttimeout = now.tv_sec + 60; - (void)wakeup((void *)&nfslockdwaiting); - } - /* wait on nfslockdvnode for a while to allow daemon to start */ - while (!nfslockdvnode && (now.tv_sec < nfslockdstarttimeout)) { - error = tsleep((void *)&nfslockdvnode, PCATCH | PUSER, "lockdstart", 2*hz); - if (error && (error != EWOULDBLOCK)) - return (error); - /* check that we still have our mount... */ - /* ...and that we still support locks */ - nmp = VFSTONFS(vnode_mount(vp)); - if (!nmp) - return (ENXIO); - if (nmp->nm_flag & NFSMNT_NOLOCKS) - return (ENOTSUP); - if (!error) - break; - microuptime(&now); - } - /* - * check for nfslockdvnode - * If it hasn't started by now, there's a problem. - */ - if (!(wvp = nfslockdvnode)) - return (ENOTSUP); - } - error = vnode_getwithref(wvp); - if (error) - return (ENOTSUP); - error = vnode_ref(wvp); - if (error) { - vnode_put(wvp); - return (ENOTSUP); - } - - /* - * Need to check if this process has successfully acquired an NFS lock before. - * If not, and this is an unlock request we can simply return success here. - */ - lockpidcheck = nfs_lock_pid_check(p, 0, vp); - if (lockpidcheck) { - if (lockpidcheck != ENOENT) { - vnode_rele(wvp); - vnode_put(wvp); - return (lockpidcheck); - } - if (ap->a_op == F_UNLCK) { - vnode_rele(wvp); - vnode_put(wvp); - return (0); - } + nmp = NFSTONMP(np); + if (!nmp || !nmp->nm_saddr) { + return ENXIO; } - /* - * The NFS Lock Manager protocol doesn't directly handle - * negative lengths or SEEK_END, so we need to normalize - * things here where we have all the info. - * (Note: SEEK_CUR is already adjusted for at this point) - */ - /* Convert the flock structure into a start and end. */ - switch (fl->l_whence) { - case SEEK_SET: - case SEEK_CUR: - /* - * Caller is responsible for adding any necessary offset - * to fl->l_start when SEEK_CUR is used. - */ - start = fl->l_start; - break; - case SEEK_END: - /* need to flush, and refetch attributes to make */ - /* sure we have the correct end of file offset */ - if (np->n_flag & NMODIFIED) { - NATTRINVALIDATE(np); - error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1); - if (error) { - vnode_rele(wvp); - vnode_put(wvp); - return (error); - } - } - NATTRINVALIDATE(np); - - error = nfs_getattr(vp, &nvattr, cred, p); - if (error) { - vnode_rele(wvp); - vnode_put(wvp); - return (error); - } - start = np->n_size + fl->l_start; - break; - default: - vnode_rele(wvp); - vnode_put(wvp); - return (EINVAL); - } - if (fl->l_len == 0) - end = -1; - else if (fl->l_len > 0) - end = start + fl->l_len - 1; - else { /* l_len is negative */ - end = start - 1; - start += fl->l_len; - } - if (start < 0) { - vnode_rele(wvp); - vnode_put(wvp); - return (EINVAL); - } - if (!NFS_ISV3(vp) && - ((start >= 0x80000000) || (end >= 0x80000000))) { - vnode_rele(wvp); - vnode_put(wvp); - return (EINVAL); + lck_mtx_lock(&nmp->nm_lock); + saddr = nmp->nm_saddr; + bcopy(saddr, &msg->lm_addr, min(sizeof msg->lm_addr, saddr->sa_len)); + if (nmp->nm_vers == NFS_VER3) { + msg->lm_flags |= LOCKD_MSG_NFSV3; } - /* - * Fill in the information structure. - */ - msgreq.lmr_answered = 0; - msgreq.lmr_errno = 0; - msgreq.lmr_saved_errno = 0; - msg = &msgreq.lmr_msg; - msg->lm_version = LOCKD_MSG_VERSION; - msg->lm_flags = 0; - - msg->lm_fl = *fl; - msg->lm_fl.l_start = start; - if (end != -1) - msg->lm_fl.l_len = end - start + 1; - msg->lm_fl.l_pid = proc_pid(p); - - if (ap->a_flags & F_WAIT) - msg->lm_flags |= LOCKD_MSG_BLOCK; - if (ap->a_op == F_GETLK) - msg->lm_flags |= LOCKD_MSG_TEST; - - nmp = VFSTONFS(vnode_mount(vp)); - if (!nmp) { - vnode_rele(wvp); - vnode_put(wvp); - return (ENXIO); + if (nmp->nm_sotype != SOCK_DGRAM) { + msg->lm_flags |= LOCKD_MSG_TCP; } - saddr = mbuf_data(nmp->nm_nam); - bcopy(saddr, &msg->lm_addr, min(sizeof msg->lm_addr, saddr->sa_len)); - msg->lm_fh_len = NFS_ISV3(vp) ? VTONFS(vp)->n_fhsize : NFSX_V2FH; - bcopy(VTONFS(vp)->n_fhp, msg->lm_fh, msg->lm_fh_len); - if (NFS_ISV3(vp)) - msg->lm_flags |= LOCKD_MSG_NFSV3; - cru2x(cred, &msg->lm_cred); - microuptime(&now); + starttime = now.tv_sec; lastmsg = now.tv_sec - ((nmp->nm_tprintf_delay) - (nmp->nm_tprintf_initial_delay)); + interruptable = NMFLAG(nmp, INTR); + lck_mtx_unlock(&nmp->nm_lock); - fmode = FFLAGS(O_WRONLY); - if ((error = VNOP_OPEN(wvp, fmode, ap->a_context))) { - vnode_rele(wvp); - vnode_put(wvp); - return (error); - } - vnode_lock(wvp); - ++wvp->v_writecount; - vnode_unlock(wvp); + lck_mtx_lock(nfs_lock_mutex); /* allocate unique xid */ msg->lm_xid = nfs_lockxid_get(); - nfs_lockdmsg_enqueue(&msgreq); - - timeo = 2*hz; -#define IO_NOMACCHECK 0; - ioflg = IO_UNIT | IO_NOMACCHECK; - for (;;) { - error = 0; - while (nfslockdfifolock & NFSLOCKDFIFOLOCK_LOCKED) { - nfslockdfifolock |= NFSLOCKDFIFOLOCK_WANT; - error = tsleep((void *)&nfslockdfifolock, - PCATCH | PUSER, "lockdfifo", 20*hz); - if (error) - break; - } - if (error) - break; - nfslockdfifolock |= NFSLOCKDFIFOLOCK_LOCKED; + nfs_lockdmsg_enqueue(msgreq); - error = vn_rdwr(UIO_WRITE, wvp, (caddr_t)msg, sizeof(*msg), 0, - UIO_SYSSPACE32, ioflg, proc_ucred(kernproc), NULL, p); + timeo = 4; - nfslockdfifolock &= ~NFSLOCKDFIFOLOCK_LOCKED; - if (nfslockdfifolock & NFSLOCKDFIFOLOCK_WANT) { - nfslockdfifolock &= ~NFSLOCKDFIFOLOCK_WANT; - wakeup((void *)&nfslockdfifolock); - } + for (;;) { + nfs_lockd_request_sent = 1; - if (error && (((ioflg & IO_NDELAY) == 0) || error != EAGAIN)) { + /* need to drop nfs_lock_mutex while calling nfs_lockd_send_request() */ + lck_mtx_unlock(nfs_lock_mutex); + error = nfs_lockd_send_request(msg, interruptable); + lck_mtx_lock(nfs_lock_mutex); + if (error && error != EAGAIN) { break; } @@ -700,22 +490,26 @@ nfs_dolock(struct vnop_advlock_args *ap) * Retry if it takes too long to get a response. * * The timeout numbers were picked out of thin air... they start - * at 2 and double each timeout with a max of 60 seconds. + * at 4 and double each timeout with a max of 30 seconds. * * In order to maintain responsiveness, we pass a small timeout - * to tsleep and calculate the timeouts ourselves. This allows + * to msleep and calculate the timeouts ourselves. This allows * us to pick up on mount changes quicker. */ wait_for_granted: error = EWOULDBLOCK; + slpflag = (interruptable && (type != F_UNLCK)) ? PCATCH : 0; + ts.tv_sec = 2; + ts.tv_nsec = 0; microuptime(&now); - if ((timeo/hz) > 0) - endtime = now.tv_sec + timeo/hz; - else - endtime = now.tv_sec + 1; + endtime = now.tv_sec + timeo; while (now.tv_sec < endtime) { - error = tsleep((void *)&msgreq, PCATCH | PUSER, "lockd", 2*hz); - if (msgreq.lmr_answered) { + error = error2 = 0; + if (!msgreq->lmr_answered) { + error = msleep(msgreq, nfs_lock_mutex, slpflag | PUSER, "lockd", &ts); + slpflag = 0; + } + if (msgreq->lmr_answered) { /* * Note: it's possible to have a lock granted at * essentially the same time that we get interrupted. @@ -723,102 +517,130 @@ wait_for_granted: * error from this request or we might not unlock the * lock that's been granted. */ - error = 0; + nmp = NFSTONMP(np); + if ((msgreq->lmr_errno == ENOTSUP) && nmp && + (nmp->nm_state & NFSSTA_LOCKSWORK)) { + /* + * We have evidence that locks work, yet lockd + * returned ENOTSUP. This is probably because + * it was unable to contact the server's lockd + * to send it the request. + * + * Because we know locks work, we'll consider + * this failure to be a timeout. + */ + error = EWOULDBLOCK; + } else { + error = 0; + } break; } - if (error != EWOULDBLOCK) + if (error != EWOULDBLOCK) { break; + } /* check that we still have our mount... */ /* ...and that we still support locks */ - nmp = VFSTONFS(vnode_mount(vp)); - if (!nmp || (nmp->nm_flag & NFSMNT_NOLOCKS)) + /* ...and that there isn't a recovery pending */ + nmp = NFSTONMP(np); + if ((error2 = nfs_sigintr(nmp, NULL, NULL, 0))) { + error = error2; + if (type == F_UNLCK) { + printf("nfs3_lockd_request: aborting unlock request, error %d\n", error); + } break; - /* - * If the mount is hung and we've requested not to hang - * on remote filesystems, then bail now. - */ - if ((p != NULL) && ((proc_noremotehang(p)) != 0) && - ((nmp->nm_state & (NFSSTA_TIMEO|NFSSTA_LOCKTIMEO)) != 0)) { - if (fl->l_type == F_UNLCK) - printf("nfs_dolock: aborting unlock request " - "due to timeout (noremotehang)\n"); - error = EIO; + } + lck_mtx_lock(&nmp->nm_lock); + if (nmp->nm_lockmode == NFS_LOCK_MODE_DISABLED) { + lck_mtx_unlock(&nmp->nm_lock); + break; + } + if ((nmp->nm_state & NFSSTA_RECOVER) && !(flags & R_RECOVER)) { + /* recovery pending... return an error that'll get this operation restarted */ + error = NFSERR_GRACE; + lck_mtx_unlock(&nmp->nm_lock); break; } + interruptable = NMFLAG(nmp, INTR); + lck_mtx_unlock(&nmp->nm_lock); microuptime(&now); } if (error) { /* check that we still have our mount... */ - nmp = VFSTONFS(vnode_mount(vp)); - if (!nmp) { - if (error == EWOULDBLOCK) - error = ENXIO; - break; + nmp = NFSTONMP(np); + if ((error2 = nfs_sigintr(nmp, NULL, NULL, 0))) { + error = error2; + if (error2 != EINTR) { + if (type == F_UNLCK) { + printf("nfs3_lockd_request: aborting unlock request, error %d\n", error); + } + break; + } } /* ...and that we still support locks */ - if (nmp->nm_flag & NFSMNT_NOLOCKS) { - if (error == EWOULDBLOCK) + lck_mtx_lock(&nmp->nm_lock); + if (nmp->nm_lockmode == NFS_LOCK_MODE_DISABLED) { + if (error == EWOULDBLOCK) { error = ENOTSUP; + } + lck_mtx_unlock(&nmp->nm_lock); break; } - if ((error == ENOTSUP) && - (nmp->nm_state & NFSSTA_LOCKSWORK)) { - /* - * We have evidence that locks work, yet lockd - * returned ENOTSUP. This is probably because - * it was unable to contact the server's lockd to - * send it the request. - * - * Because we know locks work, we'll consider - * this failure to be a timeout. - */ - error = EWOULDBLOCK; + /* ...and that there isn't a recovery pending */ + if ((error == EWOULDBLOCK) && (nmp->nm_state & NFSSTA_RECOVER) && !(flags & R_RECOVER)) { + /* recovery pending... return to allow recovery to occur */ + error = NFSERR_DENIED; + lck_mtx_unlock(&nmp->nm_lock); + break; } - if (error != EWOULDBLOCK) { + interruptable = NMFLAG(nmp, INTR); + if ((error != EWOULDBLOCK) || + ((nmp->nm_state & NFSSTA_RECOVER) && !(flags & R_RECOVER)) || + ((flags & R_RECOVER) && ((now.tv_sec - starttime) > 30))) { + if ((error == EWOULDBLOCK) && (flags & R_RECOVER)) { + /* give up if this is for recovery and taking too long */ + error = ETIMEDOUT; + } else if ((nmp->nm_state & NFSSTA_RECOVER) && !(flags & R_RECOVER)) { + /* recovery pending... return an error that'll get this operation restarted */ + error = NFSERR_GRACE; + } + lck_mtx_unlock(&nmp->nm_lock); /* * We're going to bail on this request. * If we were a blocked lock request, send a cancel. */ - if ((msgreq.lmr_errno == EINPROGRESS) && + if ((msgreq->lmr_errno == EINPROGRESS) && !(msg->lm_flags & LOCKD_MSG_CANCEL)) { /* set this request up as a cancel */ msg->lm_flags |= LOCKD_MSG_CANCEL; - nfs_lockdmsg_dequeue(&msgreq); + nfs_lockdmsg_dequeue(msgreq); msg->lm_xid = nfs_lockxid_get(); - nfs_lockdmsg_enqueue(&msgreq); - msgreq.lmr_saved_errno = error; - msgreq.lmr_errno = 0; - msgreq.lmr_answered = 0; + nfs_lockdmsg_enqueue(msgreq); + msgreq->lmr_saved_errno = error; + msgreq->lmr_errno = 0; + msgreq->lmr_answered = 0; /* reset timeout */ - timeo = 2*hz; + timeo = 2; /* send cancel request */ continue; } break; } - /* - * If the mount is hung and we've requested not to hang - * on remote filesystems, then bail now. - */ - if ((p != NULL) && ((proc_noremotehang(p)) != 0) && - ((nmp->nm_state & (NFSSTA_TIMEO|NFSSTA_LOCKTIMEO)) != 0)) { - if (fl->l_type == F_UNLCK) - printf("nfs_dolock: aborting unlock request " - "due to timeout (noremotehang)\n"); - error = EIO; - break; - } /* warn if we're not getting any response */ microuptime(&now); - if ((msgreq.lmr_errno != EINPROGRESS) && + if ((msgreq->lmr_errno != EINPROGRESS) && + !(msg->lm_flags & LOCKD_MSG_DENIED_GRACE) && (nmp->nm_tprintf_initial_delay != 0) && ((lastmsg + nmp->nm_tprintf_delay) < now.tv_sec)) { + lck_mtx_unlock(&nmp->nm_lock); lastmsg = now.tv_sec; - nfs_down(nmp, p, 0, NFSSTA_LOCKTIMEO, "lockd not responding"); + nfs_down(nmp, thd, 0, NFSSTA_LOCKTIMEO, "lockd not responding", 1); wentdown = 1; + } else { + lck_mtx_unlock(&nmp->nm_lock); } - if (msgreq.lmr_errno == EINPROGRESS) { + + if (msgreq->lmr_errno == EINPROGRESS) { /* * We've got a blocked lock request that we are * going to retry. First, we'll want to try to @@ -831,70 +653,65 @@ wait_for_granted: * it is NLM_BLOCKED). */ msg->lm_flags |= LOCKD_MSG_CANCEL; - nfs_lockdmsg_dequeue(&msgreq); + nfs_lockdmsg_dequeue(msgreq); msg->lm_xid = nfs_lockxid_get(); - nfs_lockdmsg_enqueue(&msgreq); - msgreq.lmr_saved_errno = msgreq.lmr_errno; - msgreq.lmr_errno = 0; - msgreq.lmr_answered = 0; - timeo = 2*hz; + nfs_lockdmsg_enqueue(msgreq); + msgreq->lmr_saved_errno = msgreq->lmr_errno; + msgreq->lmr_errno = 0; + msgreq->lmr_answered = 0; + timeo = 2; /* send cancel then resend request */ continue; } + /* - * We timed out, so we will rewrite the request - * to the fifo, but only if it isn't already full. + * We timed out, so we will resend the request. */ - ioflg |= IO_NDELAY; - timeo *= 2; - if (timeo > 60*hz) - timeo = 60*hz; + if (!(flags & R_RECOVER)) { + timeo *= 2; + } + if (timeo > 30) { + timeo = 30; + } /* resend request */ continue; } /* we got a reponse, so the server's lockd is OK */ - nfs_up(VFSTONFS(vnode_mount(vp)), p, NFSSTA_LOCKTIMEO, - wentdown ? "lockd alive again" : NULL); + nfs_up(NFSTONMP(np), thd, NFSSTA_LOCKTIMEO, + wentdown ? "lockd alive again" : NULL); wentdown = 0; - if (msgreq.lmr_errno == EINPROGRESS) { + if (msgreq->lmr_answered && (msg->lm_flags & LOCKD_MSG_DENIED_GRACE)) { + /* + * The lock request was denied because the server lockd is + * still in its grace period. So, we need to try the + * request again in a little bit. Return the GRACE error so + * the higher levels can perform the retry. + */ + msgreq->lmr_saved_errno = msgreq->lmr_errno = error = NFSERR_GRACE; + } + + if (msgreq->lmr_errno == EINPROGRESS) { /* got NLM_BLOCKED response */ /* need to wait for NLM_GRANTED */ - timeo = 60*hz; - msgreq.lmr_answered = 0; + timeo = 30; + msgreq->lmr_answered = 0; goto wait_for_granted; } if ((msg->lm_flags & LOCKD_MSG_CANCEL) && - (msgreq.lmr_saved_errno == EINPROGRESS)) { + (msgreq->lmr_saved_errno == EINPROGRESS)) { /* * We just got a successful reply to the * cancel of the previous blocked lock request. - * Now, go ahead and resend the request. + * Now, go ahead and return a DENIED error so the + * higher levels can resend the request. */ msg->lm_flags &= ~LOCKD_MSG_CANCEL; - nfs_lockdmsg_dequeue(&msgreq); - msg->lm_xid = nfs_lockxid_get(); - nfs_lockdmsg_enqueue(&msgreq); - msgreq.lmr_saved_errno = 0; - msgreq.lmr_errno = 0; - msgreq.lmr_answered = 0; - timeo = 2*hz; - /* resend request */ - continue; - } - - if ((msg->lm_flags & LOCKD_MSG_TEST) && msgreq.lmr_errno == 0) { - if (msg->lm_fl.l_type != F_UNLCK) { - fl->l_type = msg->lm_fl.l_type; - fl->l_pid = msg->lm_fl.l_pid; - fl->l_start = msg->lm_fl.l_start; - fl->l_len = msg->lm_fl.l_len; - fl->l_whence = SEEK_SET; - } else { - fl->l_type = F_UNLCK; - } + error = NFSERR_DENIED; + /* Will dequeue msgreq after the following break at the end of this routine */ + break; } /* @@ -904,35 +721,202 @@ wait_for_granted: */ if (msg->lm_flags & LOCKD_MSG_CANCEL) { msg->lm_flags &= ~LOCKD_MSG_CANCEL; - error = msgreq.lmr_saved_errno; - } else - error = msgreq.lmr_errno; + error = msgreq->lmr_saved_errno; + } else { + error = msgreq->lmr_errno; + } - if (!error) { - /* record that NFS file locking has worked on this mount */ - nmp = VFSTONFS(vnode_mount(vp)); - if (nmp && !(nmp->nm_state & NFSSTA_LOCKSWORK)) - nmp->nm_state |= NFSSTA_LOCKSWORK; + nmp = NFSTONMP(np); + if ((error == ENOTSUP) && nmp && !(nmp->nm_state & NFSSTA_LOCKSWORK)) { /* - * If we successfully acquired a lock, make sure this pid - * is in the nfs_lock_pid hash table so we know we can't - * short-circuit unlock requests. + * We have NO evidence that locks work and lockd + * returned ENOTSUP. Let's take this as a hint + * that locks aren't supported and disable them + * for this mount. */ - if ((lockpidcheck == ENOENT) && - ((ap->a_op == F_SETLK) || (ap->a_op == F_SETLKW))) - nfs_lock_pid_check(p, 1, vp); - + nfs_lockdmsg_dequeue(msgreq); + lck_mtx_unlock(nfs_lock_mutex); + lck_mtx_lock(&nmp->nm_lock); + if (nmp->nm_lockmode == NFS_LOCK_MODE_ENABLED) { + nmp->nm_lockmode = NFS_LOCK_MODE_DISABLED; + nfs_lockd_mount_unregister(nmp); + } + nmp->nm_state &= ~NFSSTA_LOCKTIMEO; + lck_mtx_unlock(&nmp->nm_lock); + printf("lockd returned ENOTSUP, disabling locks for nfs server: %s\n", + vfs_statfs(nmp->nm_mountp)->f_mntfromname); + return error; + } + if (!error) { + /* record that NFS file locking has worked on this mount */ + if (nmp) { + lck_mtx_lock(&nmp->nm_lock); + if (!(nmp->nm_state & NFSSTA_LOCKSWORK)) { + nmp->nm_state |= NFSSTA_LOCKSWORK; + } + lck_mtx_unlock(&nmp->nm_lock); + } } break; } - nfs_lockdmsg_dequeue(&msgreq); + nfs_lockdmsg_dequeue(msgreq); + + lck_mtx_unlock(nfs_lock_mutex); + + return error; +} + +/* + * Send an NLM LOCK message to the server + */ +int +nfs3_setlock_rpc( + nfsnode_t np, + struct nfs_open_file *nofp, + struct nfs_file_lock *nflp, + int reclaim, + int flags, + thread_t thd, + kauth_cred_t cred) +{ + struct nfs_lock_owner *nlop = nflp->nfl_owner; + struct nfsmount *nmp; + int error; + LOCKD_MSG_REQUEST msgreq; + LOCKD_MSG *msg; + + nmp = NFSTONMP(np); + if (nfs_mount_gone(nmp)) { + return ENXIO; + } + + if (!nlop->nlo_open_owner) { + nfs_open_owner_ref(nofp->nof_owner); + nlop->nlo_open_owner = nofp->nof_owner; + } + if ((error = nfs_lock_owner_set_busy(nlop, thd))) { + return error; + } + + /* set up lock message request structure */ + bzero(&msgreq, sizeof(msgreq)); + msg = &msgreq.lmr_msg; + msg->lm_version = LOCKD_MSG_VERSION; + if ((nflp->nfl_flags & NFS_FILE_LOCK_WAIT) && !reclaim) { + msg->lm_flags |= LOCKD_MSG_BLOCK; + } + if (reclaim) { + msg->lm_flags |= LOCKD_MSG_RECLAIM; + } + msg->lm_fh_len = (nmp->nm_vers == NFS_VER2) ? NFSX_V2FH : np->n_fhsize; + bcopy(np->n_fhp, msg->lm_fh, msg->lm_fh_len); + cru2x(cred, &msg->lm_cred); + + msg->lm_fl.l_whence = SEEK_SET; + msg->lm_fl.l_start = nflp->nfl_start; + msg->lm_fl.l_len = NFS_FLOCK_LENGTH(nflp->nfl_start, nflp->nfl_end); + msg->lm_fl.l_type = nflp->nfl_type; + msg->lm_fl.l_pid = nlop->nlo_pid; + + error = nfs3_lockd_request(np, 0, &msgreq, flags, thd); + + nfs_lock_owner_clear_busy(nlop); + return error; +} + +/* + * Send an NLM UNLOCK message to the server + */ +int +nfs3_unlock_rpc( + nfsnode_t np, + struct nfs_lock_owner *nlop, + __unused int type, + uint64_t start, + uint64_t end, + int flags, + thread_t thd, + kauth_cred_t cred) +{ + struct nfsmount *nmp; + LOCKD_MSG_REQUEST msgreq; + LOCKD_MSG *msg; + + nmp = NFSTONMP(np); + if (!nmp) { + return ENXIO; + } + + /* set up lock message request structure */ + bzero(&msgreq, sizeof(msgreq)); + msg = &msgreq.lmr_msg; + msg->lm_version = LOCKD_MSG_VERSION; + msg->lm_fh_len = (nmp->nm_vers == NFS_VER2) ? NFSX_V2FH : np->n_fhsize; + bcopy(np->n_fhp, msg->lm_fh, msg->lm_fh_len); + cru2x(cred, &msg->lm_cred); + + msg->lm_fl.l_whence = SEEK_SET; + msg->lm_fl.l_start = start; + msg->lm_fl.l_len = NFS_FLOCK_LENGTH(start, end); + msg->lm_fl.l_type = F_UNLCK; + msg->lm_fl.l_pid = nlop->nlo_pid; + + return nfs3_lockd_request(np, F_UNLCK, &msgreq, flags, thd); +} + +/* + * Send an NLM LOCK TEST message to the server + */ +int +nfs3_getlock_rpc( + nfsnode_t np, + struct nfs_lock_owner *nlop, + struct flock *fl, + uint64_t start, + uint64_t end, + vfs_context_t ctx) +{ + struct nfsmount *nmp; + int error; + LOCKD_MSG_REQUEST msgreq; + LOCKD_MSG *msg; + + nmp = NFSTONMP(np); + if (nfs_mount_gone(nmp)) { + return ENXIO; + } + + /* set up lock message request structure */ + bzero(&msgreq, sizeof(msgreq)); + msg = &msgreq.lmr_msg; + msg->lm_version = LOCKD_MSG_VERSION; + msg->lm_flags |= LOCKD_MSG_TEST; + msg->lm_fh_len = (nmp->nm_vers == NFS_VER2) ? NFSX_V2FH : np->n_fhsize; + bcopy(np->n_fhp, msg->lm_fh, msg->lm_fh_len); + cru2x(vfs_context_ucred(ctx), &msg->lm_cred); + + msg->lm_fl.l_whence = SEEK_SET; + msg->lm_fl.l_start = start; + msg->lm_fl.l_len = NFS_FLOCK_LENGTH(start, end); + msg->lm_fl.l_type = fl->l_type; + msg->lm_fl.l_pid = nlop->nlo_pid; + + error = nfs3_lockd_request(np, 0, &msgreq, 0, vfs_context_thread(ctx)); + + if (!error && (msg->lm_flags & LOCKD_MSG_TEST) && !msgreq.lmr_errno) { + if (msg->lm_fl.l_type != F_UNLCK) { + fl->l_type = msg->lm_fl.l_type; + fl->l_pid = msg->lm_fl.l_pid; + fl->l_start = msg->lm_fl.l_start; + fl->l_len = msg->lm_fl.l_len; + fl->l_whence = SEEK_SET; + } else { + fl->l_type = F_UNLCK; + } + } - error1 = VNOP_CLOSE(wvp, FWRITE, ap->a_context); - vnode_rele(wvp); - vnode_put(wvp); - /* prefer any previous 'error' to our vn_close 'error1'. */ - return (error != 0 ? error : error1); + return error; } /* @@ -947,12 +931,16 @@ nfslockdans(proc_t p, struct lockd_ans *ansp) /* Let root make this call. */ error = proc_suser(p); - if (error) - return (error); + if (error) { + return error; + } /* the version should match, or we're out of sync */ - if (ansp->la_version != LOCKD_ANS_VERSION) - return (EINVAL); + if (ansp->la_version != LOCKD_ANS_VERSION) { + return EINVAL; + } + + lck_mtx_lock(nfs_lock_mutex); /* try to find the lockd message by transaction id (cookie) */ msgreq = nfs_lockdmsg_find_by_xid(ansp->la_xid); @@ -963,25 +951,30 @@ nfslockdans(proc_t p, struct lockd_ans *ansp) * If no message was found or it doesn't match the answer, * we look for the lockd message by the answer's lock info. */ - if (!msgreq || nfs_lockdmsg_compare_to_answer(msgreq, ansp)) + if (!msgreq || nfs_lockdmsg_compare_to_answer(msgreq, ansp)) { msgreq = nfs_lockdmsg_find_by_answer(ansp); + } /* * We need to make sure this request isn't being cancelled * If it is, we don't want to accept the granted message. */ - if (msgreq && (msgreq->lmr_msg.lm_flags & LOCKD_MSG_CANCEL)) + if (msgreq && (msgreq->lmr_msg.lm_flags & LOCKD_MSG_CANCEL)) { msgreq = NULL; + } + } + if (!msgreq) { + lck_mtx_unlock(nfs_lock_mutex); + return EPIPE; } - if (!msgreq) - return (EPIPE); msgreq->lmr_errno = ansp->la_errno; if ((msgreq->lmr_msg.lm_flags & LOCKD_MSG_TEST) && msgreq->lmr_errno == 0) { if (ansp->la_flags & LOCKD_ANS_LOCK_INFO) { - if (ansp->la_flags & LOCKD_ANS_LOCK_EXCL) + if (ansp->la_flags & LOCKD_ANS_LOCK_EXCL) { msgreq->lmr_msg.lm_fl.l_type = F_WRLCK; - else + } else { msgreq->lmr_msg.lm_fl.l_type = F_RDLCK; + } msgreq->lmr_msg.lm_fl.l_pid = ansp->la_pid; msgreq->lmr_msg.lm_fl.l_start = ansp->la_start; msgreq->lmr_msg.lm_fl.l_len = ansp->la_len; @@ -989,72 +982,76 @@ nfslockdans(proc_t p, struct lockd_ans *ansp) msgreq->lmr_msg.lm_fl.l_type = F_UNLCK; } } + if (ansp->la_flags & LOCKD_ANS_DENIED_GRACE) { + msgreq->lmr_msg.lm_flags |= LOCKD_MSG_DENIED_GRACE; + } msgreq->lmr_answered = 1; - (void)wakeup((void *)msgreq); + lck_mtx_unlock(nfs_lock_mutex); + wakeup(msgreq); - return (0); + return 0; } /* - * nfslockdfd -- - * NFS advisory byte-level locks: fifo file# from the lock daemon. + * nfslockdnotify -- + * NFS host restart notification from the lock daemon. + * + * Used to initiate reclaiming of held locks when a server we + * have mounted reboots. */ int -nfslockdfd(proc_t p, int fd) +nfslockdnotify(proc_t p, user_addr_t argp) { - int error; - vnode_t vp, oldvp; + int error, i, headsize; + struct lockd_notify ln; + struct nfsmount *nmp; + struct sockaddr *saddr; + /* Let root make this call. */ error = proc_suser(p); - if (error) - return (error); - if (fd < 0) { - vp = NULL; - } else { - error = file_vnode(fd, &vp); - if (error) - return (error); - error = vnode_getwithref(vp); - if (error) - return (error); - error = vnode_ref(vp); - if (error) { - vnode_put(vp); - return (error); - } + if (error) { + return error; } - oldvp = nfslockdvnode; - nfslockdvnode = vp; - if (oldvp) { - vnode_rele(oldvp); + + headsize = (char*)&ln.ln_addr[0] - (char*)&ln.ln_version; + error = copyin(argp, &ln, headsize); + if (error) { + return error; } - (void)wakeup((void *)&nfslockdvnode); - if (vp) { - vnode_put(vp); + if (ln.ln_version != LOCKD_NOTIFY_VERSION) { + return EINVAL; } - return (0); -} + if ((ln.ln_addrcount < 1) || (ln.ln_addrcount > 128)) { + return EINVAL; + } + argp += headsize; + saddr = (struct sockaddr *)&ln.ln_addr[0]; -/* - * nfslockdwait -- - * lock daemon waiting for lock request - */ -int -nfslockdwait(proc_t p) -{ - int error; + lck_mtx_lock(nfs_lock_mutex); - error = proc_suser(p); - if (error) - return (error); - if (nfslockdwaiting || nfslockdvnode) - return (EBUSY); + for (i = 0; i < ln.ln_addrcount; i++) { + error = copyin(argp, &ln.ln_addr[0], sizeof(ln.ln_addr[0])); + if (error) { + break; + } + argp += sizeof(ln.ln_addr[0]); + /* scan lockd mount list for match to this address */ + TAILQ_FOREACH(nmp, &nfs_lockd_mount_list, nm_ldlink) { + /* check if address matches this mount's server address */ + if (!nmp->nm_saddr || nfs_sockaddr_cmp(saddr, nmp->nm_saddr)) { + continue; + } + /* We have a match! Mark it as needing recovery. */ + lck_mtx_lock(&nmp->nm_lock); + nfs_need_recover(nmp, 0); + lck_mtx_unlock(&nmp->nm_lock); + } + } - nfslockdstarttimeout = 0; - nfslockdwaiting = 1; - tsleep((void *)&nfslockdwaiting, PCATCH | PUSER, "lockd", 0); - nfslockdwaiting = 0; + lck_mtx_unlock(nfs_lock_mutex); - return (0); + return error; } + +#endif /* CONFIG_NFS_CLIENT */