538 lines
14 KiB
C
538 lines
14 KiB
C
/*
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*
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* Coda: an Experimental Distributed File System
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* Release 3.1
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*
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* Copyright (c) 1987-1998 Carnegie Mellon University
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* All Rights Reserved
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation, and
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* that credit is given to Carnegie Mellon University in all documents
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* and publicity pertaining to direct or indirect use of this code or its
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* derivatives.
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*
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* CODA IS AN EXPERIMENTAL SOFTWARE SYSTEM AND IS KNOWN TO HAVE BUGS,
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* SOME OF WHICH MAY HAVE SERIOUS CONSEQUENCES. CARNEGIE MELLON ALLOWS
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* FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION. CARNEGIE MELLON
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* DISCLAIMS ANY LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER
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* RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OF THIS SOFTWARE OR OF
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* ANY DERIVATIVE WORK.
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*
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* Carnegie Mellon encourages users of this software to return any
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* improvements or extensions that they make, and to grant Carnegie
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* Mellon the rights to redistribute these changes without encumbrance.
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*
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* @(#) src/sys/cfs/coda_vfsops.c,v 1.1.1.1 1998/08/29 21:14:52 rvb Exp $
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* $FreeBSD$
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*
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*/
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/*
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* Mach Operating System
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* Copyright (c) 1989 Carnegie-Mellon University
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* All rights reserved. The CMU software License Agreement specifies
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* the terms and conditions for use and redistribution.
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*/
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/*
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* This code was written for the Coda file system at Carnegie Mellon
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* University. Contributers include David Steere, James Kistler, and
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* M. Satyanarayanan.
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*/
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#include <vcoda.h>
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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/proc.h>
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#include <sys/malloc.h>
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#include <sys/conf.h>
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#include <sys/namei.h>
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#include <sys/mount.h>
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#include <sys/select.h>
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#include <coda/coda.h>
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#include <coda/cnode.h>
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#include <coda/coda_vfsops.h>
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#include <coda/coda_venus.h>
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#include <coda/coda_subr.h>
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#include <coda/coda_opstats.h>
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MALLOC_DEFINE(M_CODA, "CODA storage", "Various Coda Structures");
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int codadebug = 0;
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int coda_vfsop_print_entry = 0;
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#define ENTRY if(coda_vfsop_print_entry) myprintf(("Entered %s\n",__FUNCTION__))
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struct vnode *coda_ctlvp;
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struct coda_mntinfo coda_mnttbl[NVCODA]; /* indexed by minor device number */
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/* structure to keep statistics of internally generated/satisfied calls */
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struct coda_op_stats coda_vfsopstats[CODA_VFSOPS_SIZE];
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#define MARK_ENTRY(op) (coda_vfsopstats[op].entries++)
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#define MARK_INT_SAT(op) (coda_vfsopstats[op].sat_intrn++)
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#define MARK_INT_FAIL(op) (coda_vfsopstats[op].unsat_intrn++)
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#define MRAK_INT_GEN(op) (coda_vfsopstats[op].gen_intrn++)
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extern int coda_nc_initialized; /* Set if cache has been initialized */
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extern int vc_nb_open __P((dev_t, int, int, struct proc *));
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int
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coda_vfsopstats_init(void)
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{
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register int i;
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for (i=0;i<CODA_VFSOPS_SIZE;i++) {
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coda_vfsopstats[i].opcode = i;
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coda_vfsopstats[i].entries = 0;
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coda_vfsopstats[i].sat_intrn = 0;
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coda_vfsopstats[i].unsat_intrn = 0;
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coda_vfsopstats[i].gen_intrn = 0;
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}
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return 0;
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}
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/*
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* cfs mount vfsop
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* Set up mount info record and attach it to vfs struct.
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*/
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/*ARGSUSED*/
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int
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coda_mount(vfsp, path, data, ndp, p)
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struct mount *vfsp; /* Allocated and initialized by mount(2) */
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char *path; /* path covered: ignored by the fs-layer */
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caddr_t data; /* Need to define a data type for this in netbsd? */
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struct nameidata *ndp; /* Clobber this to lookup the device name */
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struct proc *p; /* The ever-famous proc pointer */
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{
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struct vnode *dvp;
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struct cnode *cp;
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dev_t dev;
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struct coda_mntinfo *mi;
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struct vnode *rootvp;
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ViceFid rootfid;
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ViceFid ctlfid;
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int error;
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ENTRY;
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coda_vfsopstats_init();
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coda_vnodeopstats_init();
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MARK_ENTRY(CODA_MOUNT_STATS);
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if (CODA_MOUNTED(vfsp)) {
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MARK_INT_FAIL(CODA_MOUNT_STATS);
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return(EBUSY);
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}
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/* Validate mount device. Similar to getmdev(). */
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NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, data, p);
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error = namei(ndp);
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dvp = ndp->ni_vp;
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if (error) {
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MARK_INT_FAIL(CODA_MOUNT_STATS);
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return (error);
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}
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if (dvp->v_type != VCHR) {
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MARK_INT_FAIL(CODA_MOUNT_STATS);
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vrele(dvp);
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return(ENXIO);
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}
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dev = dvp->v_rdev;
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vrele(dvp);
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/*
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* See if the device table matches our expectations.
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*/
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if (devsw(dev)->d_open != vc_nb_open)
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{
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MARK_INT_FAIL(CODA_MOUNT_STATS);
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return(ENXIO);
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}
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if (minor(dev) >= NVCODA || minor(dev) < 0) {
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MARK_INT_FAIL(CODA_MOUNT_STATS);
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return(ENXIO);
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}
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/*
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* Initialize the mount record and link it to the vfs struct
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*/
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mi = &coda_mnttbl[minor(dev)];
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if (!VC_OPEN(&mi->mi_vcomm)) {
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MARK_INT_FAIL(CODA_MOUNT_STATS);
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return(ENODEV);
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}
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/* No initialization (here) of mi_vcomm! */
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vfsp->mnt_data = (qaddr_t)mi;
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vfs_getnewfsid (vfsp);
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mi->mi_vfsp = vfsp;
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/*
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* Make a root vnode to placate the Vnode interface, but don't
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* actually make the CODA_ROOT call to venus until the first call
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* to coda_root in case a server is down while venus is starting.
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*/
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rootfid.Volume = 0;
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rootfid.Vnode = 0;
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rootfid.Unique = 0;
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cp = make_coda_node(&rootfid, vfsp, VDIR);
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rootvp = CTOV(cp);
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rootvp->v_flag |= VROOT;
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ctlfid.Volume = CTL_VOL;
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ctlfid.Vnode = CTL_VNO;
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ctlfid.Unique = CTL_UNI;
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/* cp = make_coda_node(&ctlfid, vfsp, VCHR);
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The above code seems to cause a loop in the cnode links.
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I don't totally understand when it happens, it is caught
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when closing down the system.
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*/
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cp = make_coda_node(&ctlfid, 0, VCHR);
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coda_ctlvp = CTOV(cp);
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/* Add vfs and rootvp to chain of vfs hanging off mntinfo */
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mi->mi_vfsp = vfsp;
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mi->mi_rootvp = rootvp;
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/* set filesystem block size */
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vfsp->mnt_stat.f_bsize = 8192; /* XXX -JJK */
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/* Set f_iosize. XXX -- inamura@isl.ntt.co.jp.
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For vnode_pager_haspage() references. The value should be obtained
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from underlying UFS. */
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/* Checked UFS. iosize is set as 8192 */
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vfsp->mnt_stat.f_iosize = 8192;
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/* error is currently guaranteed to be zero, but in case some
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code changes... */
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CODADEBUG(1,
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myprintf(("coda_mount returned %d\n",error)););
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if (error)
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MARK_INT_FAIL(CODA_MOUNT_STATS);
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else
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MARK_INT_SAT(CODA_MOUNT_STATS);
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return(error);
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}
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int
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coda_unmount(vfsp, mntflags, p)
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struct mount *vfsp;
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int mntflags;
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struct proc *p;
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{
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struct coda_mntinfo *mi = vftomi(vfsp);
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int active, error = 0;
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ENTRY;
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MARK_ENTRY(CODA_UMOUNT_STATS);
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if (!CODA_MOUNTED(vfsp)) {
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MARK_INT_FAIL(CODA_UMOUNT_STATS);
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return(EINVAL);
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}
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if (mi->mi_vfsp == vfsp) { /* We found the victim */
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if (!IS_UNMOUNTING(VTOC(mi->mi_rootvp)))
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return (EBUSY); /* Venus is still running */
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#ifdef DEBUG
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printf("coda_unmount: ROOT: vp %p, cp %p\n", mi->mi_rootvp, VTOC(mi->mi_rootvp));
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#endif
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vrele(mi->mi_rootvp);
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active = coda_kill(vfsp, NOT_DOWNCALL);
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mi->mi_rootvp->v_flag &= ~VROOT;
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error = vflush(mi->mi_vfsp, NULLVP, FORCECLOSE);
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printf("coda_unmount: active = %d, vflush active %d\n", active, error);
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error = 0;
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/* I'm going to take this out to allow lookups to go through. I'm
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* not sure it's important anyway. -- DCS 2/2/94
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*/
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/* vfsp->VFS_DATA = NULL; */
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/* No more vfsp's to hold onto */
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mi->mi_vfsp = NULL;
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mi->mi_rootvp = NULL;
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if (error)
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MARK_INT_FAIL(CODA_UMOUNT_STATS);
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else
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MARK_INT_SAT(CODA_UMOUNT_STATS);
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return(error);
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}
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return (EINVAL);
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}
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/*
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* find root of cfs
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*/
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int
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coda_root(vfsp, vpp)
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struct mount *vfsp;
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struct vnode **vpp;
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{
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struct coda_mntinfo *mi = vftomi(vfsp);
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struct vnode **result;
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int error;
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struct proc *p = curproc; /* XXX - bnoble */
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ViceFid VFid;
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ENTRY;
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MARK_ENTRY(CODA_ROOT_STATS);
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result = NULL;
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if (vfsp == mi->mi_vfsp) {
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if ((VTOC(mi->mi_rootvp)->c_fid.Volume != 0) ||
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(VTOC(mi->mi_rootvp)->c_fid.Vnode != 0) ||
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(VTOC(mi->mi_rootvp)->c_fid.Unique != 0))
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{ /* Found valid root. */
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*vpp = mi->mi_rootvp;
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/* On Mach, this is vref. On NetBSD, VOP_LOCK */
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#if 1
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vref(*vpp);
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vn_lock(*vpp, LK_EXCLUSIVE, p);
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#else
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vget(*vpp, LK_EXCLUSIVE, p);
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#endif
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MARK_INT_SAT(CODA_ROOT_STATS);
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return(0);
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}
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}
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error = venus_root(vftomi(vfsp), p->p_ucred, p, &VFid);
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if (!error) {
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/*
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* Save the new rootfid in the cnode, and rehash the cnode into the
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* cnode hash with the new fid key.
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*/
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coda_unsave(VTOC(mi->mi_rootvp));
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VTOC(mi->mi_rootvp)->c_fid = VFid;
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coda_save(VTOC(mi->mi_rootvp));
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*vpp = mi->mi_rootvp;
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#if 1
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vref(*vpp);
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vn_lock(*vpp, LK_EXCLUSIVE, p);
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#else
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vget(*vpp, LK_EXCLUSIVE, p);
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#endif
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MARK_INT_SAT(CODA_ROOT_STATS);
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goto exit;
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} else if (error == ENODEV || error == EINTR) {
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/* Gross hack here! */
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/*
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* If Venus fails to respond to the CODA_ROOT call, coda_call returns
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* ENODEV. Return the uninitialized root vnode to allow vfs
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* operations such as unmount to continue. Without this hack,
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* there is no way to do an unmount if Venus dies before a
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* successful CODA_ROOT call is done. All vnode operations
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* will fail.
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*/
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*vpp = mi->mi_rootvp;
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#if 1
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vref(*vpp);
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vn_lock(*vpp, LK_EXCLUSIVE, p);
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#else
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vget(*vpp, LK_EXCLUSIVE, p);
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#endif
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MARK_INT_FAIL(CODA_ROOT_STATS);
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error = 0;
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goto exit;
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} else {
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CODADEBUG( CODA_ROOT, myprintf(("error %d in CODA_ROOT\n", error)); );
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MARK_INT_FAIL(CODA_ROOT_STATS);
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goto exit;
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}
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exit:
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return(error);
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}
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/*
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* Get file system statistics.
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*/
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int
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coda_nb_statfs(vfsp, sbp, p)
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register struct mount *vfsp;
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struct statfs *sbp;
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struct proc *p;
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{
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ENTRY;
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/* MARK_ENTRY(CODA_STATFS_STATS); */
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if (!CODA_MOUNTED(vfsp)) {
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/* MARK_INT_FAIL(CODA_STATFS_STATS);*/
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return(EINVAL);
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}
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bzero(sbp, sizeof(struct statfs));
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/* XXX - what to do about f_flags, others? --bnoble */
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/* Below This is what AFS does
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#define NB_SFS_SIZ 0x895440
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*/
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/* Note: Normal fs's have a bsize of 0x400 == 1024 */
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sbp->f_type = vfsp->mnt_vfc->vfc_typenum;
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sbp->f_bsize = 8192; /* XXX */
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sbp->f_iosize = 8192; /* XXX */
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#define NB_SFS_SIZ 0x8AB75D
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sbp->f_blocks = NB_SFS_SIZ;
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sbp->f_bfree = NB_SFS_SIZ;
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sbp->f_bavail = NB_SFS_SIZ;
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sbp->f_files = NB_SFS_SIZ;
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sbp->f_ffree = NB_SFS_SIZ;
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bcopy((caddr_t)&(vfsp->mnt_stat.f_fsid), (caddr_t)&(sbp->f_fsid), sizeof (fsid_t));
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snprintf(sbp->f_mntonname, sizeof(sbp->f_mntonname), "/coda");
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snprintf(sbp->f_mntfromname, sizeof(sbp->f_mntfromname), "CODA");
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/* MARK_INT_SAT(CODA_STATFS_STATS); */
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return(0);
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}
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/*
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* Flush any pending I/O.
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*/
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int
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coda_sync(vfsp, waitfor, cred, p)
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struct mount *vfsp;
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int waitfor;
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struct ucred *cred;
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struct proc *p;
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{
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ENTRY;
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MARK_ENTRY(CODA_SYNC_STATS);
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MARK_INT_SAT(CODA_SYNC_STATS);
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return(0);
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}
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/*
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* fhtovp is now what vget used to be in 4.3-derived systems. For
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* some silly reason, vget is now keyed by a 32 bit ino_t, rather than
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* a type-specific fid.
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*/
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int
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coda_fhtovp(vfsp, fhp, nam, vpp, exflagsp, creadanonp)
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register struct mount *vfsp;
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struct fid *fhp;
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struct mbuf *nam;
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struct vnode **vpp;
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int *exflagsp;
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struct ucred **creadanonp;
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{
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struct cfid *cfid = (struct cfid *)fhp;
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struct cnode *cp = 0;
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int error;
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struct proc *p = curproc; /* XXX -mach */
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ViceFid VFid;
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int vtype;
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ENTRY;
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MARK_ENTRY(CODA_VGET_STATS);
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/* Check for vget of control object. */
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if (IS_CTL_FID(&cfid->cfid_fid)) {
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*vpp = coda_ctlvp;
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vref(coda_ctlvp);
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MARK_INT_SAT(CODA_VGET_STATS);
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return(0);
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}
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error = venus_fhtovp(vftomi(vfsp), &cfid->cfid_fid, p->p_ucred, p, &VFid, &vtype);
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if (error) {
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CODADEBUG(CODA_VGET, myprintf(("vget error %d\n",error));)
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*vpp = (struct vnode *)0;
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} else {
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CODADEBUG(CODA_VGET,
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myprintf(("vget: vol %lx vno %lx uni %lx type %d result %d\n",
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VFid.Volume, VFid.Vnode, VFid.Unique, vtype, error)); )
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cp = make_coda_node(&VFid, vfsp, vtype);
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*vpp = CTOV(cp);
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}
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return(error);
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}
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/*
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* To allow for greater ease of use, some vnodes may be orphaned when
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* Venus dies. Certain operations should still be allowed to go
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* through, but without propagating ophan-ness. So this function will
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* get a new vnode for the file from the current run of Venus. */
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int
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getNewVnode(vpp)
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struct vnode **vpp;
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{
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struct cfid cfid;
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struct coda_mntinfo *mi = vftomi((*vpp)->v_mount);
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ENTRY;
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cfid.cfid_len = (short)sizeof(ViceFid);
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cfid.cfid_fid = VTOC(*vpp)->c_fid; /* Structure assignment. */
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/* XXX ? */
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/* We're guessing that if set, the 1st element on the list is a
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* valid vnode to use. If not, return ENODEV as venus is dead.
|
|
*/
|
|
if (mi->mi_vfsp == NULL)
|
|
return ENODEV;
|
|
|
|
return coda_fhtovp(mi->mi_vfsp, (struct fid*)&cfid, NULL, vpp,
|
|
NULL, NULL);
|
|
}
|
|
|
|
#include <ufs/ufs/quota.h>
|
|
#include <ufs/ufs/ufsmount.h>
|
|
/* get the mount structure corresponding to a given device. Assume
|
|
* device corresponds to a UFS. Return NULL if no device is found.
|
|
*/
|
|
struct mount *devtomp(dev)
|
|
dev_t dev;
|
|
{
|
|
struct mount *mp;
|
|
|
|
TAILQ_FOREACH(mp, &mountlist, mnt_list) {
|
|
if (((VFSTOUFS(mp))->um_dev == dev)) {
|
|
/* mount corresponds to UFS and the device matches one we want */
|
|
return(mp);
|
|
}
|
|
}
|
|
/* mount structure wasn't found */
|
|
return(NULL);
|
|
}
|
|
|
|
struct vfsops coda_vfsops = {
|
|
coda_mount,
|
|
vfs_stdstart,
|
|
coda_unmount,
|
|
coda_root,
|
|
vfs_stdquotactl,
|
|
coda_nb_statfs,
|
|
coda_sync,
|
|
vfs_stdvget,
|
|
vfs_stdfhtovp,
|
|
vfs_stdcheckexp,
|
|
vfs_stdvptofh,
|
|
vfs_stdinit
|
|
};
|
|
|
|
VFS_SET(coda_vfsops, coda, VFCF_NETWORK);
|