391 lines
10 KiB
C
391 lines
10 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Rick Macklem at The University of Guelph.
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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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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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* from nfs_subs.c 8.8 (Berkeley) 5/22/95
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* These functions support the macros and help fiddle mbuf chains for
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* the nfs op functions. They do things like create the rpc header and
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* copy data between mbuf chains and uio lists.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/bio.h>
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#include <sys/buf.h>
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#include <sys/proc.h>
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#include <sys/mount.h>
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#include <sys/vnode.h>
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#include <sys/namei.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/malloc.h>
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#include <sys/syscall.h>
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#include <sys/sysproto.h>
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#include <sys/taskqueue.h>
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#include <vm/vm.h>
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#include <vm/vm_object.h>
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#include <vm/vm_extern.h>
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#include <vm/uma.h>
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#include <fs/nfs/nfsport.h>
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#include <fs/nfsclient/nfsnode.h>
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#include <fs/nfsclient/nfsmount.h>
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#include <fs/nfsclient/nfs.h>
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#include <fs/nfsclient/nfs_kdtrace.h>
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#include <netinet/in.h>
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/*
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* Note that stdarg.h and the ANSI style va_start macro is used for both
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* ANSI and traditional C compilers.
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*/
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#include <machine/stdarg.h>
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extern struct mtx ncl_iod_mutex;
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extern enum nfsiod_state ncl_iodwant[NFS_MAXASYNCDAEMON];
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extern struct nfsmount *ncl_iodmount[NFS_MAXASYNCDAEMON];
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extern int ncl_numasync;
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extern unsigned int ncl_iodmax;
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extern struct nfsstatsv1 nfsstatsv1;
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struct task ncl_nfsiodnew_task;
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int
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ncl_uninit(struct vfsconf *vfsp)
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{
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/*
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* XXX: Unloading of nfscl module is unsupported.
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*/
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#if 0
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int i;
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/*
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* Tell all nfsiod processes to exit. Clear ncl_iodmax, and wakeup
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* any sleeping nfsiods so they check ncl_iodmax and exit.
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*/
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NFSLOCKIOD();
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ncl_iodmax = 0;
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for (i = 0; i < ncl_numasync; i++)
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if (ncl_iodwant[i] == NFSIOD_AVAILABLE)
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wakeup(&ncl_iodwant[i]);
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/* The last nfsiod to exit will wake us up when ncl_numasync hits 0 */
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while (ncl_numasync)
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msleep(&ncl_numasync, &ncl_iod_mutex, PWAIT, "ioddie", 0);
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NFSUNLOCKIOD();
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ncl_nhuninit();
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return (0);
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#else
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return (EOPNOTSUPP);
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#endif
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}
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/* Returns with NFSLOCKNODE() held. */
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void
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ncl_dircookie_lock(struct nfsnode *np)
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{
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NFSLOCKNODE(np);
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while (np->n_flag & NDIRCOOKIELK)
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(void) msleep(&np->n_flag, &np->n_mtx, PZERO, "nfsdirlk", 0);
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np->n_flag |= NDIRCOOKIELK;
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}
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void
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ncl_dircookie_unlock(struct nfsnode *np)
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{
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NFSLOCKNODE(np);
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np->n_flag &= ~NDIRCOOKIELK;
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wakeup(&np->n_flag);
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NFSUNLOCKNODE(np);
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}
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bool
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ncl_excl_start(struct vnode *vp)
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{
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struct nfsnode *np;
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int vn_lk;
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ASSERT_VOP_LOCKED(vp, "ncl_excl_start");
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vn_lk = NFSVOPISLOCKED(vp);
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if (vn_lk == LK_EXCLUSIVE)
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return (false);
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KASSERT(vn_lk == LK_SHARED,
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("ncl_excl_start: wrong vnode lock %d", vn_lk));
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/* Ensure exclusive access, this might block */
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np = VTONFS(vp);
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lockmgr(&np->n_excl, LK_EXCLUSIVE, NULL);
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return (true);
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}
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void
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ncl_excl_finish(struct vnode *vp, bool old_lock)
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{
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struct nfsnode *np;
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if (!old_lock)
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return;
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np = VTONFS(vp);
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lockmgr(&np->n_excl, LK_RELEASE, NULL);
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}
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#ifdef NFS_ACDEBUG
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#include <sys/sysctl.h>
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SYSCTL_DECL(_vfs_nfs);
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static int nfs_acdebug;
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SYSCTL_INT(_vfs_nfs, OID_AUTO, acdebug, CTLFLAG_RW, &nfs_acdebug, 0, "");
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#endif
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/*
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* Check the time stamp
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* If the cache is valid, copy contents to *vap and return 0
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* otherwise return an error
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*/
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int
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ncl_getattrcache(struct vnode *vp, struct vattr *vaper)
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{
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struct nfsnode *np;
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struct vattr *vap;
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struct nfsmount *nmp;
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int timeo, mustflush;
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u_quad_t nsize;
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bool setnsize;
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np = VTONFS(vp);
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vap = &np->n_vattr.na_vattr;
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nmp = VFSTONFS(vp->v_mount);
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mustflush = nfscl_mustflush(vp); /* must be before mtx_lock() */
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NFSLOCKNODE(np);
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/* XXX n_mtime doesn't seem to be updated on a miss-and-reload */
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timeo = (time_second - np->n_mtime.tv_sec) / 10;
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#ifdef NFS_ACDEBUG
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if (nfs_acdebug>1)
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printf("ncl_getattrcache: initial timeo = %d\n", timeo);
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#endif
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if (vap->va_type == VDIR) {
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if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acdirmin)
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timeo = nmp->nm_acdirmin;
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else if (timeo > nmp->nm_acdirmax)
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timeo = nmp->nm_acdirmax;
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} else {
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if ((np->n_flag & NMODIFIED) || timeo < nmp->nm_acregmin)
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timeo = nmp->nm_acregmin;
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else if (timeo > nmp->nm_acregmax)
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timeo = nmp->nm_acregmax;
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}
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#ifdef NFS_ACDEBUG
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if (nfs_acdebug > 2)
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printf("acregmin %d; acregmax %d; acdirmin %d; acdirmax %d\n",
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nmp->nm_acregmin, nmp->nm_acregmax,
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nmp->nm_acdirmin, nmp->nm_acdirmax);
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if (nfs_acdebug)
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printf("ncl_getattrcache: age = %d; final timeo = %d\n",
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(time_second - np->n_attrstamp), timeo);
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#endif
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if ((time_second - np->n_attrstamp) >= timeo &&
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(mustflush != 0 || np->n_attrstamp == 0)) {
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nfsstatsv1.attrcache_misses++;
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NFSUNLOCKNODE(np);
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KDTRACE_NFS_ATTRCACHE_GET_MISS(vp);
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return( ENOENT);
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}
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nfsstatsv1.attrcache_hits++;
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setnsize = false;
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if (vap->va_size != np->n_size) {
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if (vap->va_type == VREG) {
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if (np->n_flag & NMODIFIED) {
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if (vap->va_size < np->n_size)
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vap->va_size = np->n_size;
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else
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np->n_size = vap->va_size;
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} else {
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np->n_size = vap->va_size;
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}
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setnsize = ncl_pager_setsize(vp, &nsize);
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} else {
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np->n_size = vap->va_size;
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}
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}
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bcopy((caddr_t)vap, (caddr_t)vaper, sizeof(struct vattr));
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if (np->n_flag & NCHG) {
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if (np->n_flag & NACC)
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vaper->va_atime = np->n_atim;
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if (np->n_flag & NUPD)
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vaper->va_mtime = np->n_mtim;
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}
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NFSUNLOCKNODE(np);
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if (setnsize)
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vnode_pager_setsize(vp, nsize);
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KDTRACE_NFS_ATTRCACHE_GET_HIT(vp, vap);
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return (0);
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}
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static nfsuint64 nfs_nullcookie = { { 0, 0 } };
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/*
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* This function finds the directory cookie that corresponds to the
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* logical byte offset given.
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*/
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nfsuint64 *
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ncl_getcookie(struct nfsnode *np, off_t off, int add)
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{
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struct nfsdmap *dp, *dp2;
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int pos;
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nfsuint64 *retval = NULL;
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pos = (uoff_t)off / NFS_DIRBLKSIZ;
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if (pos == 0 || off < 0) {
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KASSERT(!add, ("nfs getcookie add at <= 0"));
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return (&nfs_nullcookie);
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}
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pos--;
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dp = LIST_FIRST(&np->n_cookies);
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if (!dp) {
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if (add) {
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dp = malloc(sizeof (struct nfsdmap),
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M_NFSDIROFF, M_WAITOK);
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dp->ndm_eocookie = 0;
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LIST_INSERT_HEAD(&np->n_cookies, dp, ndm_list);
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} else
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goto out;
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}
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while (pos >= NFSNUMCOOKIES) {
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pos -= NFSNUMCOOKIES;
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if (LIST_NEXT(dp, ndm_list)) {
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if (!add && dp->ndm_eocookie < NFSNUMCOOKIES &&
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pos >= dp->ndm_eocookie)
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goto out;
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dp = LIST_NEXT(dp, ndm_list);
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} else if (add) {
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dp2 = malloc(sizeof (struct nfsdmap),
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M_NFSDIROFF, M_WAITOK);
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dp2->ndm_eocookie = 0;
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LIST_INSERT_AFTER(dp, dp2, ndm_list);
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dp = dp2;
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} else
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goto out;
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}
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if (pos >= dp->ndm_eocookie) {
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if (add)
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dp->ndm_eocookie = pos + 1;
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else
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goto out;
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}
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retval = &dp->ndm_cookies[pos];
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out:
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return (retval);
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}
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/*
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* Invalidate cached directory information, except for the actual directory
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* blocks (which are invalidated separately).
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* Done mainly to avoid the use of stale offset cookies.
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*/
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void
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ncl_invaldir(struct vnode *vp)
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{
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struct nfsnode *np = VTONFS(vp);
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KASSERT(vp->v_type == VDIR, ("nfs: invaldir not dir"));
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ncl_dircookie_lock(np);
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np->n_direofoffset = 0;
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NFSUNLOCKNODE(np);
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np->n_cookieverf.nfsuquad[0] = 0;
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np->n_cookieverf.nfsuquad[1] = 0;
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if (LIST_FIRST(&np->n_cookies))
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LIST_FIRST(&np->n_cookies)->ndm_eocookie = 0;
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ncl_dircookie_unlock(np);
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}
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/*
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* The write verifier has changed (probably due to a server reboot), so all
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* B_NEEDCOMMIT blocks will have to be written again. Since they are on the
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* dirty block list as B_DELWRI, all this takes is clearing the B_NEEDCOMMIT
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* and B_CLUSTEROK flags. Once done the new write verifier can be set for the
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* mount point.
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*
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* B_CLUSTEROK must be cleared along with B_NEEDCOMMIT because stage 1 data
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* writes are not clusterable.
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*/
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void
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ncl_clearcommit(struct mount *mp)
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{
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struct vnode *vp, *nvp;
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struct buf *bp, *nbp;
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struct bufobj *bo;
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MNT_VNODE_FOREACH_ALL(vp, mp, nvp) {
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bo = &vp->v_bufobj;
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vholdl(vp);
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VI_UNLOCK(vp);
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BO_LOCK(bo);
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TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
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if (!BUF_ISLOCKED(bp) &&
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(bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
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== (B_DELWRI | B_NEEDCOMMIT))
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bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
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}
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BO_UNLOCK(bo);
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vdrop(vp);
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}
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}
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/*
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* Called once to initialize data structures...
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*/
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int
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ncl_init(struct vfsconf *vfsp)
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{
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int i;
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/* Ensure async daemons disabled */
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for (i = 0; i < NFS_MAXASYNCDAEMON; i++) {
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ncl_iodwant[i] = NFSIOD_NOT_AVAILABLE;
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ncl_iodmount[i] = NULL;
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}
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TASK_INIT(&ncl_nfsiodnew_task, 0, ncl_nfsiodnew_tq, NULL);
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ncl_nhinit(); /* Init the nfsnode table */
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return (0);
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}
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