The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/nfs/nfs_iod.c

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    1 /*      $NetBSD: nfs_iod.c,v 1.4 2009/12/31 19:38:16 christos Exp $     */
    2 
    3 /*
    4  * Copyright (c) 1989, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * This code is derived from software contributed to Berkeley by
    8  * Rick Macklem at The University of Guelph.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      @(#)nfs_syscalls.c      8.5 (Berkeley) 3/30/95
   35  */
   36 
   37 #include <sys/cdefs.h>
   38 __KERNEL_RCSID(0, "$NetBSD: nfs_iod.c,v 1.4 2009/12/31 19:38:16 christos Exp $");
   39 
   40 #include <sys/param.h>
   41 #include <sys/systm.h>
   42 #include <sys/kernel.h>
   43 #include <sys/file.h>
   44 #include <sys/stat.h>
   45 #include <sys/vnode.h>
   46 #include <sys/mount.h>
   47 #include <sys/proc.h>
   48 #include <sys/uio.h>
   49 #include <sys/malloc.h>
   50 #include <sys/kmem.h>
   51 #include <sys/buf.h>
   52 #include <sys/mbuf.h>
   53 #include <sys/socket.h>
   54 #include <sys/socketvar.h>
   55 #include <sys/signalvar.h>
   56 #include <sys/domain.h>
   57 #include <sys/protosw.h>
   58 #include <sys/namei.h>
   59 #include <sys/syslog.h>
   60 #include <sys/filedesc.h>
   61 #include <sys/kthread.h>
   62 #include <sys/kauth.h>
   63 #include <sys/syscallargs.h>
   64 
   65 #include <netinet/in.h>
   66 #include <netinet/tcp.h>
   67 #include <nfs/xdr_subs.h>
   68 #include <nfs/rpcv2.h>
   69 #include <nfs/nfsproto.h>
   70 #include <nfs/nfs.h>
   71 #include <nfs/nfsm_subs.h>
   72 #include <nfs/nfsrvcache.h>
   73 #include <nfs/nfsmount.h>
   74 #include <nfs/nfsnode.h>
   75 #include <nfs/nfsrtt.h>
   76 #include <nfs/nfs_var.h>
   77 
   78 extern int nuidhash_max;
   79 
   80 /*
   81  * locking order:
   82  *      nfs_iodlist_lock -> nid_lock -> nm_lock
   83  */
   84 kmutex_t nfs_iodlist_lock;
   85 struct nfs_iodlist nfs_iodlist_idle;
   86 struct nfs_iodlist nfs_iodlist_all;
   87 int nfs_niothreads = -1; /* == "0, and has never been set" */
   88 int nfs_defect = 0;
   89 
   90 /*
   91  * Asynchronous I/O threads for client nfs.
   92  * They do read-ahead and write-behind operations on the block I/O cache.
   93  * Never returns unless it fails or gets killed.
   94  */
   95 
   96 static void
   97 nfssvc_iod(void *arg)
   98 {
   99         struct buf *bp;
  100         struct nfs_iod *myiod;
  101         struct nfsmount *nmp;
  102 
  103         myiod = kmem_alloc(sizeof(*myiod), KM_SLEEP);
  104         mutex_init(&myiod->nid_lock, MUTEX_DEFAULT, IPL_NONE);
  105         cv_init(&myiod->nid_cv, "nfsiod");
  106         myiod->nid_exiting = false;
  107         myiod->nid_mount = NULL;
  108         mutex_enter(&nfs_iodlist_lock);
  109         LIST_INSERT_HEAD(&nfs_iodlist_all, myiod, nid_all);
  110         mutex_exit(&nfs_iodlist_lock);
  111 
  112         for (;;) {
  113                 mutex_enter(&nfs_iodlist_lock);
  114                 LIST_INSERT_HEAD(&nfs_iodlist_idle, myiod, nid_idle);
  115                 mutex_exit(&nfs_iodlist_lock);
  116 
  117                 mutex_enter(&myiod->nid_lock);
  118                 while (/*CONSTCOND*/ true) {
  119                         nmp = myiod->nid_mount;
  120                         if (nmp) {
  121                                 myiod->nid_mount = NULL;
  122                                 break;
  123                         }
  124                         if (__predict_false(myiod->nid_exiting)) {
  125                                 /*
  126                                  * drop nid_lock to preserve locking order.
  127                                  */
  128                                 mutex_exit(&myiod->nid_lock);
  129                                 mutex_enter(&nfs_iodlist_lock);
  130                                 mutex_enter(&myiod->nid_lock);
  131                                 /*
  132                                  * recheck nid_mount because nfs_asyncio can
  133                                  * pick us in the meantime as we are still on
  134                                  * nfs_iodlist_lock.
  135                                  */
  136                                 if (myiod->nid_mount != NULL) {
  137                                         mutex_exit(&nfs_iodlist_lock);
  138                                         continue;
  139                                 }
  140                                 LIST_REMOVE(myiod, nid_idle);
  141                                 mutex_exit(&nfs_iodlist_lock);
  142                                 goto quit;
  143                         }
  144                         cv_wait(&myiod->nid_cv, &myiod->nid_lock);
  145                 }
  146                 mutex_exit(&myiod->nid_lock);
  147 
  148                 mutex_enter(&nmp->nm_lock);
  149                 while ((bp = TAILQ_FIRST(&nmp->nm_bufq)) != NULL) {
  150                         /* Take one off the front of the list */
  151                         TAILQ_REMOVE(&nmp->nm_bufq, bp, b_freelist);
  152                         nmp->nm_bufqlen--;
  153                         if (nmp->nm_bufqlen < 2 * nmp->nm_bufqiods) {
  154                                 cv_broadcast(&nmp->nm_aiocv);
  155                         }
  156                         mutex_exit(&nmp->nm_lock);
  157                         KERNEL_LOCK(1, curlwp);
  158                         (void)nfs_doio(bp);
  159                         KERNEL_UNLOCK_LAST(curlwp);
  160                         mutex_enter(&nmp->nm_lock);
  161                         /*
  162                          * If there are more than one iod on this mount, 
  163                          * then defect so that the iods can be shared out
  164                          * fairly between the mounts
  165                          */
  166                         if (nfs_defect && nmp->nm_bufqiods > 1) {
  167                                 break;
  168                         }
  169                 }
  170                 KASSERT(nmp->nm_bufqiods > 0);
  171                 nmp->nm_bufqiods--;
  172                 mutex_exit(&nmp->nm_lock);
  173         }
  174 quit:
  175         KASSERT(myiod->nid_mount == NULL);
  176         mutex_exit(&myiod->nid_lock);
  177 
  178         cv_destroy(&myiod->nid_cv);
  179         mutex_destroy(&myiod->nid_lock);
  180         kmem_free(myiod, sizeof(*myiod));
  181 
  182         kthread_exit(0);
  183 }
  184 
  185 void
  186 nfs_iodinit(void)
  187 {
  188 
  189         mutex_init(&nfs_iodlist_lock, MUTEX_DEFAULT, IPL_NONE);
  190         LIST_INIT(&nfs_iodlist_all);
  191         LIST_INIT(&nfs_iodlist_idle);
  192 }
  193 
  194 void
  195 nfs_iodfini(void)
  196 {
  197         int error;
  198 
  199         error = nfs_set_niothreads(0);
  200         KASSERT(error == 0);
  201         mutex_destroy(&nfs_iodlist_lock);
  202 }
  203 
  204 int
  205 nfs_set_niothreads(int newval)
  206 {
  207         struct nfs_iod *nid;
  208         int error = 0;
  209         int hold_count;
  210 
  211         KERNEL_UNLOCK_ALL(curlwp, &hold_count);
  212 
  213         mutex_enter(&nfs_iodlist_lock);
  214         /* clamp to sane range */
  215         nfs_niothreads = max(0, min(newval, NFS_MAXASYNCDAEMON));
  216 
  217         while (nfs_numasync != nfs_niothreads && error == 0) {
  218                 while (nfs_numasync < nfs_niothreads) {
  219 
  220                         /*
  221                          * kthread_create can wait for pagedaemon and
  222                          * pagedaemon can wait for nfsiod which needs to acquire
  223                          * nfs_iodlist_lock.
  224                          */
  225 
  226                         mutex_exit(&nfs_iodlist_lock);
  227                         error = kthread_create(PRI_NONE, KTHREAD_MPSAFE, NULL,
  228                             nfssvc_iod, NULL, NULL, "nfsio");
  229                         mutex_enter(&nfs_iodlist_lock);
  230                         if (error) {
  231                                 /* give up */
  232                                 nfs_niothreads = nfs_numasync;
  233                                 break;
  234                         }
  235                         nfs_numasync++;
  236                 }
  237                 while (nfs_numasync > nfs_niothreads) {
  238                         nid = LIST_FIRST(&nfs_iodlist_all);
  239                         if (nid == NULL) {
  240                                 /* iod has not started yet. */
  241                                 kpause("nfsiorm", false, hz, &nfs_iodlist_lock);
  242                                 continue;
  243                         }
  244                         LIST_REMOVE(nid, nid_all);
  245                         mutex_enter(&nid->nid_lock);
  246                         KASSERT(!nid->nid_exiting);
  247                         nid->nid_exiting = true;
  248                         cv_signal(&nid->nid_cv);
  249                         mutex_exit(&nid->nid_lock);
  250                         nfs_numasync--;
  251                 }
  252         }
  253         mutex_exit(&nfs_iodlist_lock);
  254 
  255         KERNEL_LOCK(hold_count, curlwp);
  256         return error;
  257 }
  258 
  259 /*
  260  * Get an authorization string for the uid by having the mount_nfs sitting
  261  * on this mount point porpous out of the kernel and do it.
  262  */
  263 int
  264 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)
  265         /* key:          return session key */
  266 {
  267         int error = 0;
  268 
  269         while ((nmp->nm_iflag & NFSMNT_WAITAUTH) == 0) {
  270                 nmp->nm_iflag |= NFSMNT_WANTAUTH;
  271                 (void) tsleep((void *)&nmp->nm_authtype, PSOCK,
  272                         "nfsauth1", 2 * hz);
  273                 error = nfs_sigintr(nmp, rep, rep->r_lwp);
  274                 if (error) {
  275                         nmp->nm_iflag &= ~NFSMNT_WANTAUTH;
  276                         return (error);
  277                 }
  278         }
  279         nmp->nm_iflag &= ~(NFSMNT_WAITAUTH | NFSMNT_WANTAUTH);
  280         nmp->nm_authstr = *auth_str = (char *)malloc(RPCAUTH_MAXSIZ, M_TEMP, M_WAITOK);
  281         nmp->nm_authlen = RPCAUTH_MAXSIZ;
  282         nmp->nm_verfstr = verf_str;
  283         nmp->nm_verflen = *verf_len;
  284         nmp->nm_authuid = kauth_cred_geteuid(cred);
  285         wakeup((void *)&nmp->nm_authstr);
  286 
  287         /*
  288          * And wait for mount_nfs to do its stuff.
  289          */
  290         while ((nmp->nm_iflag & NFSMNT_HASAUTH) == 0 && error == 0) {
  291                 (void) tsleep((void *)&nmp->nm_authlen, PSOCK,
  292                         "nfsauth2", 2 * hz);
  293                 error = nfs_sigintr(nmp, rep, rep->r_lwp);
  294         }
  295         if (nmp->nm_iflag & NFSMNT_AUTHERR) {
  296                 nmp->nm_iflag &= ~NFSMNT_AUTHERR;
  297                 error = EAUTH;
  298         }
  299         if (error)
  300                 free((void *)*auth_str, M_TEMP);
  301         else {
  302                 *auth_len = nmp->nm_authlen;
  303                 *verf_len = nmp->nm_verflen;
  304                 memcpy(key, nmp->nm_key, sizeof (NFSKERBKEY_T));
  305         }
  306         nmp->nm_iflag &= ~NFSMNT_HASAUTH;
  307         nmp->nm_iflag |= NFSMNT_WAITAUTH;
  308         if (nmp->nm_iflag & NFSMNT_WANTAUTH) {
  309                 nmp->nm_iflag &= ~NFSMNT_WANTAUTH;
  310                 wakeup((void *)&nmp->nm_authtype);
  311         }
  312         return (error);
  313 }
  314 
  315 /*
  316  * Get a nickname authenticator and verifier.
  317  */
  318 int
  319 nfs_getnickauth(struct nfsmount *nmp, kauth_cred_t cred, char **auth_str,
  320     int *auth_len, char *verf_str, int verf_len)
  321 {
  322         struct timeval ktvin, ktvout, tv;
  323         struct nfsuid *nuidp;
  324         u_int32_t *nickp, *verfp;
  325 
  326         memset(&ktvout, 0, sizeof ktvout);      /* XXX gcc */
  327 
  328 #ifdef DIAGNOSTIC
  329         if (verf_len < (4 * NFSX_UNSIGNED))
  330                 panic("nfs_getnickauth verf too small");
  331 #endif
  332         LIST_FOREACH(nuidp, NMUIDHASH(nmp, kauth_cred_geteuid(cred)), nu_hash) {
  333                 if (kauth_cred_geteuid(nuidp->nu_cr) == kauth_cred_geteuid(cred))
  334                         break;
  335         }
  336         if (!nuidp || nuidp->nu_expire < time_second)
  337                 return (EACCES);
  338 
  339         /*
  340          * Move to the end of the lru list (end of lru == most recently used).
  341          */
  342         TAILQ_REMOVE(&nmp->nm_uidlruhead, nuidp, nu_lru);
  343         TAILQ_INSERT_TAIL(&nmp->nm_uidlruhead, nuidp, nu_lru);
  344 
  345         nickp = (u_int32_t *)malloc(2 * NFSX_UNSIGNED, M_TEMP, M_WAITOK);
  346         *nickp++ = txdr_unsigned(RPCAKN_NICKNAME);
  347         *nickp = txdr_unsigned(nuidp->nu_nickname);
  348         *auth_str = (char *)nickp;
  349         *auth_len = 2 * NFSX_UNSIGNED;
  350 
  351         /*
  352          * Now we must encrypt the verifier and package it up.
  353          */
  354         verfp = (u_int32_t *)verf_str;
  355         *verfp++ = txdr_unsigned(RPCAKN_NICKNAME);
  356         getmicrotime(&tv);
  357         if (tv.tv_sec > nuidp->nu_timestamp.tv_sec ||
  358             (tv.tv_sec == nuidp->nu_timestamp.tv_sec &&
  359              tv.tv_usec > nuidp->nu_timestamp.tv_usec))
  360                 nuidp->nu_timestamp = tv;
  361         else
  362                 nuidp->nu_timestamp.tv_usec++;
  363         ktvin.tv_sec = txdr_unsigned(nuidp->nu_timestamp.tv_sec);
  364         ktvin.tv_usec = txdr_unsigned(nuidp->nu_timestamp.tv_usec);
  365 
  366         /*
  367          * Now encrypt the timestamp verifier in ecb mode using the session
  368          * key.
  369          */
  370 #ifdef NFSKERB
  371         XXX
  372 #endif
  373 
  374         *verfp++ = ktvout.tv_sec;
  375         *verfp++ = ktvout.tv_usec;
  376         *verfp = 0;
  377         return (0);
  378 }
  379 
  380 /*
  381  * Save the current nickname in a hash list entry on the mount point.
  382  */
  383 int
  384 nfs_savenickauth(struct nfsmount *nmp, kauth_cred_t cred, int len, NFSKERBKEY_T key, struct mbuf **mdp, char **dposp, struct mbuf *mrep)
  385 {
  386         struct nfsuid *nuidp;
  387         u_int32_t *tl;
  388         int32_t t1;
  389         struct mbuf *md = *mdp;
  390         struct timeval ktvin, ktvout;
  391         u_int32_t nick;
  392         char *dpos = *dposp, *cp2;
  393         int deltasec, error = 0;
  394 
  395         memset(&ktvout, 0, sizeof ktvout);       /* XXX gcc */
  396 
  397         if (len == (3 * NFSX_UNSIGNED)) {
  398                 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
  399                 ktvin.tv_sec = *tl++;
  400                 ktvin.tv_usec = *tl++;
  401                 nick = fxdr_unsigned(u_int32_t, *tl);
  402 
  403                 /*
  404                  * Decrypt the timestamp in ecb mode.
  405                  */
  406 #ifdef NFSKERB
  407                 XXX
  408 #endif
  409                 ktvout.tv_sec = fxdr_unsigned(long, ktvout.tv_sec);
  410                 ktvout.tv_usec = fxdr_unsigned(long, ktvout.tv_usec);
  411                 deltasec = time_second - ktvout.tv_sec;
  412                 if (deltasec < 0)
  413                         deltasec = -deltasec;
  414                 /*
  415                  * If ok, add it to the hash list for the mount point.
  416                  */
  417                 if (deltasec <= NFS_KERBCLOCKSKEW) {
  418                         if (nmp->nm_numuids < nuidhash_max) {
  419                                 nmp->nm_numuids++;
  420                                 nuidp = kmem_alloc(sizeof(*nuidp), KM_SLEEP);
  421                         } else {
  422                                 nuidp = TAILQ_FIRST(&nmp->nm_uidlruhead);
  423                                 LIST_REMOVE(nuidp, nu_hash);
  424                                 TAILQ_REMOVE(&nmp->nm_uidlruhead, nuidp,
  425                                         nu_lru);
  426                         }
  427                         nuidp->nu_flag = 0;
  428                         kauth_cred_seteuid(nuidp->nu_cr, kauth_cred_geteuid(cred));
  429                         nuidp->nu_expire = time_second + NFS_KERBTTL;
  430                         nuidp->nu_timestamp = ktvout;
  431                         nuidp->nu_nickname = nick;
  432                         memcpy(nuidp->nu_key, key, sizeof (NFSKERBKEY_T));
  433                         TAILQ_INSERT_TAIL(&nmp->nm_uidlruhead, nuidp,
  434                                 nu_lru);
  435                         LIST_INSERT_HEAD(NMUIDHASH(nmp, kauth_cred_geteuid(cred)),
  436                                 nuidp, nu_hash);
  437                 }
  438         } else
  439                 nfsm_adv(nfsm_rndup(len));
  440 nfsmout:
  441         *mdp = md;
  442         *dposp = dpos;
  443         return (error);
  444 }

Cache object: 32d9d74299f1a08a8734ad3ed7512a04


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