/* $NetBSD: nfs_iod.c,v 1.8 2018/09/03 16:29:36 riastradh Exp $ */ /* * Copyright (c) 1989, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Rick Macklem at The University of Guelph. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)nfs_syscalls.c 8.5 (Berkeley) 3/30/95 */ #include __KERNEL_RCSID(0, "$NetBSD: nfs_iod.c,v 1.8 2018/09/03 16:29:36 riastradh Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include extern int nuidhash_max; /* * locking order: * nfs_iodlist_lock -> nid_lock -> nm_lock */ kmutex_t nfs_iodlist_lock; struct nfs_iodlist nfs_iodlist_idle; struct nfs_iodlist nfs_iodlist_all; int nfs_niothreads = -1; /* == "0, and has never been set" */ int nfs_defect = 0; /* * Asynchronous I/O threads for client nfs. * They do read-ahead and write-behind operations on the block I/O cache. * Never returns unless it fails or gets killed. */ static void nfssvc_iod(void *arg) { struct buf *bp; struct nfs_iod *myiod; struct nfsmount *nmp; myiod = kmem_alloc(sizeof(*myiod), KM_SLEEP); mutex_init(&myiod->nid_lock, MUTEX_DEFAULT, IPL_NONE); cv_init(&myiod->nid_cv, "nfsiod"); myiod->nid_exiting = false; myiod->nid_mount = NULL; mutex_enter(&nfs_iodlist_lock); LIST_INSERT_HEAD(&nfs_iodlist_all, myiod, nid_all); mutex_exit(&nfs_iodlist_lock); for (;;) { mutex_enter(&nfs_iodlist_lock); LIST_INSERT_HEAD(&nfs_iodlist_idle, myiod, nid_idle); mutex_exit(&nfs_iodlist_lock); mutex_enter(&myiod->nid_lock); while (/*CONSTCOND*/ true) { nmp = myiod->nid_mount; if (nmp) { myiod->nid_mount = NULL; break; } if (__predict_false(myiod->nid_exiting)) { /* * drop nid_lock to preserve locking order. */ mutex_exit(&myiod->nid_lock); mutex_enter(&nfs_iodlist_lock); mutex_enter(&myiod->nid_lock); /* * recheck nid_mount because nfs_asyncio can * pick us in the meantime as we are still on * nfs_iodlist_lock. */ if (myiod->nid_mount != NULL) { mutex_exit(&nfs_iodlist_lock); continue; } LIST_REMOVE(myiod, nid_idle); mutex_exit(&nfs_iodlist_lock); goto quit; } cv_wait(&myiod->nid_cv, &myiod->nid_lock); } mutex_exit(&myiod->nid_lock); mutex_enter(&nmp->nm_lock); while ((bp = TAILQ_FIRST(&nmp->nm_bufq)) != NULL) { /* Take one off the front of the list */ TAILQ_REMOVE(&nmp->nm_bufq, bp, b_freelist); nmp->nm_bufqlen--; if (nmp->nm_bufqlen < 2 * nmp->nm_bufqiods) { cv_broadcast(&nmp->nm_aiocv); } mutex_exit(&nmp->nm_lock); KERNEL_LOCK(1, curlwp); (void)nfs_doio(bp); KERNEL_UNLOCK_LAST(curlwp); mutex_enter(&nmp->nm_lock); /* * If there are more than one iod on this mount, * then defect so that the iods can be shared out * fairly between the mounts */ if (nfs_defect && nmp->nm_bufqiods > 1) { break; } } KASSERT(nmp->nm_bufqiods > 0); nmp->nm_bufqiods--; mutex_exit(&nmp->nm_lock); } quit: KASSERT(myiod->nid_mount == NULL); mutex_exit(&myiod->nid_lock); cv_destroy(&myiod->nid_cv); mutex_destroy(&myiod->nid_lock); kmem_free(myiod, sizeof(*myiod)); kthread_exit(0); } void nfs_iodinit(void) { mutex_init(&nfs_iodlist_lock, MUTEX_DEFAULT, IPL_NONE); LIST_INIT(&nfs_iodlist_all); LIST_INIT(&nfs_iodlist_idle); } void nfs_iodfini(void) { int error __diagused; error = nfs_set_niothreads(0); KASSERT(error == 0); mutex_destroy(&nfs_iodlist_lock); } int nfs_iodbusy(struct nfsmount *nmp) { struct nfs_iod *iod; int ret = 0; mutex_enter(&nfs_iodlist_lock); LIST_FOREACH(iod, &nfs_iodlist_all, nid_all) { if (iod->nid_mount == nmp) ret++; } mutex_exit(&nfs_iodlist_lock); return ret; } int nfs_set_niothreads(int newval) { struct nfs_iod *nid; int error = 0; int hold_count; KERNEL_UNLOCK_ALL(curlwp, &hold_count); mutex_enter(&nfs_iodlist_lock); /* clamp to sane range */ nfs_niothreads = uimax(0, uimin(newval, NFS_MAXASYNCDAEMON)); while (nfs_numasync != nfs_niothreads && error == 0) { while (nfs_numasync < nfs_niothreads) { /* * kthread_create can wait for pagedaemon and * pagedaemon can wait for nfsiod which needs to acquire * nfs_iodlist_lock. */ mutex_exit(&nfs_iodlist_lock); error = kthread_create(PRI_NONE, KTHREAD_MPSAFE, NULL, nfssvc_iod, NULL, NULL, "nfsio"); mutex_enter(&nfs_iodlist_lock); if (error) { /* give up */ nfs_niothreads = nfs_numasync; break; } nfs_numasync++; } while (nfs_numasync > nfs_niothreads) { nid = LIST_FIRST(&nfs_iodlist_all); if (nid == NULL) { /* iod has not started yet. */ kpause("nfsiorm", false, hz, &nfs_iodlist_lock); continue; } LIST_REMOVE(nid, nid_all); mutex_enter(&nid->nid_lock); KASSERT(!nid->nid_exiting); nid->nid_exiting = true; cv_signal(&nid->nid_cv); mutex_exit(&nid->nid_lock); nfs_numasync--; } } mutex_exit(&nfs_iodlist_lock); KERNEL_LOCK(hold_count, curlwp); return error; } /* * Get an authorization string for the uid by having the mount_nfs sitting * on this mount point porpous out of the kernel and do it. */ int nfs_getauth(struct nfsmount *nmp, struct nfsreq *rep, kauth_cred_t cred, char **auth_str, int *auth_len, char *verf_str, int *verf_len, NFSKERBKEY_T key) /* key: return session key */ { int error = 0; while ((nmp->nm_iflag & NFSMNT_WAITAUTH) == 0) { nmp->nm_iflag |= NFSMNT_WANTAUTH; (void) tsleep((void *)&nmp->nm_authtype, PSOCK, "nfsauth1", 2 * hz); error = nfs_sigintr(nmp, rep, rep->r_lwp); if (error) { nmp->nm_iflag &= ~NFSMNT_WANTAUTH; return (error); } } nmp->nm_iflag &= ~(NFSMNT_WAITAUTH | NFSMNT_WANTAUTH); nmp->nm_authstr = *auth_str = (char *)malloc(RPCAUTH_MAXSIZ, M_TEMP, M_WAITOK); nmp->nm_authlen = RPCAUTH_MAXSIZ; nmp->nm_verfstr = verf_str; nmp->nm_verflen = *verf_len; nmp->nm_authuid = kauth_cred_geteuid(cred); wakeup((void *)&nmp->nm_authstr); /* * And wait for mount_nfs to do its stuff. */ while ((nmp->nm_iflag & NFSMNT_HASAUTH) == 0 && error == 0) { (void) tsleep((void *)&nmp->nm_authlen, PSOCK, "nfsauth2", 2 * hz); error = nfs_sigintr(nmp, rep, rep->r_lwp); } if (nmp->nm_iflag & NFSMNT_AUTHERR) { nmp->nm_iflag &= ~NFSMNT_AUTHERR; error = EAUTH; } if (error) free((void *)*auth_str, M_TEMP); else { *auth_len = nmp->nm_authlen; *verf_len = nmp->nm_verflen; memcpy(key, nmp->nm_key, sizeof (NFSKERBKEY_T)); } nmp->nm_iflag &= ~NFSMNT_HASAUTH; nmp->nm_iflag |= NFSMNT_WAITAUTH; if (nmp->nm_iflag & NFSMNT_WANTAUTH) { nmp->nm_iflag &= ~NFSMNT_WANTAUTH; wakeup((void *)&nmp->nm_authtype); } return (error); } /* * Get a nickname authenticator and verifier. */ int nfs_getnickauth(struct nfsmount *nmp, kauth_cred_t cred, char **auth_str, int *auth_len, char *verf_str, int verf_len) { #ifdef NFSKERB struct timeval ktvin; #endif struct timeval ktvout, tv; struct nfsuid *nuidp; u_int32_t *nickp, *verfp; memset(&ktvout, 0, sizeof ktvout); /* XXX gcc */ #ifdef DIAGNOSTIC if (verf_len < (4 * NFSX_UNSIGNED)) panic("nfs_getnickauth verf too small"); #endif LIST_FOREACH(nuidp, NMUIDHASH(nmp, kauth_cred_geteuid(cred)), nu_hash) { if (kauth_cred_geteuid(nuidp->nu_cr) == kauth_cred_geteuid(cred)) break; } if (!nuidp || nuidp->nu_expire < time_second) return (EACCES); /* * Move to the end of the lru list (end of lru == most recently used). */ TAILQ_REMOVE(&nmp->nm_uidlruhead, nuidp, nu_lru); TAILQ_INSERT_TAIL(&nmp->nm_uidlruhead, nuidp, nu_lru); nickp = (u_int32_t *)malloc(2 * NFSX_UNSIGNED, M_TEMP, M_WAITOK); *nickp++ = txdr_unsigned(RPCAKN_NICKNAME); *nickp = txdr_unsigned(nuidp->nu_nickname); *auth_str = (char *)nickp; *auth_len = 2 * NFSX_UNSIGNED; /* * Now we must encrypt the verifier and package it up. */ verfp = (u_int32_t *)verf_str; *verfp++ = txdr_unsigned(RPCAKN_NICKNAME); getmicrotime(&tv); if (tv.tv_sec > nuidp->nu_timestamp.tv_sec || (tv.tv_sec == nuidp->nu_timestamp.tv_sec && tv.tv_usec > nuidp->nu_timestamp.tv_usec)) nuidp->nu_timestamp = tv; else nuidp->nu_timestamp.tv_usec++; #ifdef NFSKERB ktvin.tv_sec = txdr_unsigned(nuidp->nu_timestamp.tv_sec); ktvin.tv_usec = txdr_unsigned(nuidp->nu_timestamp.tv_usec); /* * Now encrypt the timestamp verifier in ecb mode using the session * key. */ XXX #endif *verfp++ = ktvout.tv_sec; *verfp++ = ktvout.tv_usec; *verfp = 0; return (0); } /* * Save the current nickname in a hash list entry on the mount point. */ int nfs_savenickauth(struct nfsmount *nmp, kauth_cred_t cred, int len, NFSKERBKEY_T key, struct mbuf **mdp, char **dposp, struct mbuf *mrep) { struct nfsuid *nuidp; u_int32_t *tl; int32_t t1; struct mbuf *md = *mdp; struct timeval ktvin, ktvout; u_int32_t nick; char *dpos = *dposp, *cp2; int deltasec, error = 0; memset(&ktvout, 0, sizeof ktvout); /* XXX gcc */ if (len == (3 * NFSX_UNSIGNED)) { nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); ktvin.tv_sec = *tl++; ktvin.tv_usec = *tl++; nick = fxdr_unsigned(u_int32_t, *tl); /* * Decrypt the timestamp in ecb mode. */ #ifdef NFSKERB XXX #else (void)ktvin.tv_sec; #endif ktvout.tv_sec = fxdr_unsigned(long, ktvout.tv_sec); ktvout.tv_usec = fxdr_unsigned(long, ktvout.tv_usec); deltasec = time_second - ktvout.tv_sec; if (deltasec < 0) deltasec = -deltasec; /* * If ok, add it to the hash list for the mount point. */ if (deltasec <= NFS_KERBCLOCKSKEW) { if (nmp->nm_numuids < nuidhash_max) { nmp->nm_numuids++; nuidp = kmem_alloc(sizeof(*nuidp), KM_SLEEP); } else { nuidp = TAILQ_FIRST(&nmp->nm_uidlruhead); LIST_REMOVE(nuidp, nu_hash); TAILQ_REMOVE(&nmp->nm_uidlruhead, nuidp, nu_lru); } nuidp->nu_flag = 0; kauth_cred_seteuid(nuidp->nu_cr, kauth_cred_geteuid(cred)); nuidp->nu_expire = time_second + NFS_KERBTTL; nuidp->nu_timestamp = ktvout; nuidp->nu_nickname = nick; memcpy(nuidp->nu_key, key, sizeof (NFSKERBKEY_T)); TAILQ_INSERT_TAIL(&nmp->nm_uidlruhead, nuidp, nu_lru); LIST_INSERT_HEAD(NMUIDHASH(nmp, kauth_cred_geteuid(cred)), nuidp, nu_hash); } } else nfsm_adv(nfsm_rndup(len)); nfsmout: *mdp = md; *dposp = dpos; return (error); }