480 lines
12 KiB
C
480 lines
12 KiB
C
/*-
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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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*/
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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 filesystem 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 <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/namei.h>
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#include <sys/proc.h>
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#include <fs/coda/coda.h>
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#include <fs/coda/cnode.h>
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#include <fs/coda/coda_vfsops.h>
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#include <fs/coda/coda_venus.h>
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#include <fs/coda/coda_subr.h>
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#include <fs/coda/coda_opstats.h>
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MALLOC_DEFINE(M_CODA, "coda", "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",__func__))
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struct vnode *coda_ctlvp;
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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 MARK_INT_GEN(op) (coda_vfsopstats[op].gen_intrn++)
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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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static const char *coda_opts[] = { "from", NULL };
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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(struct mount *vfsp, struct thread *td)
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{
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struct vnode *dvp;
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struct cnode *cp;
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struct cdev *dev;
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struct coda_mntinfo *mi;
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struct vnode *rootvp;
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CodaFid rootfid = INVAL_FID;
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CodaFid ctlfid = CTL_FID;
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int error;
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struct nameidata ndp;
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ENTRY;
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char *from;
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if (vfs_filteropt(vfsp->mnt_optnew, coda_opts))
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return (EINVAL);
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from = vfs_getopts(vfsp->mnt_optnew, "from", &error);
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if (error)
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return (error);
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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_SYSSPACE, from, td);
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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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NDFREE(&ndp, NDF_ONLY_PNBUF);
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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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NDFREE(&ndp, NDF_ONLY_PNBUF);
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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 = dev2coda_mntinfo(dev);
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if (!mi) {
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MARK_INT_FAIL(CODA_MOUNT_STATS);
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printf("Coda mount: %s is not a cfs device\n", from);
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return(ENXIO);
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}
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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 = mi;
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vfs_getnewfsid (vfsp);
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mi->mi_vfsp = vfsp;
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mi->mi_started = 0; /* XXX See coda_root() */
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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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cp = make_coda_node(&rootfid, vfsp, VDIR);
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rootvp = CTOV(cp);
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rootvp->v_vflag |= VV_ROOT;
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cp = make_coda_node(&ctlfid, vfsp, VREG);
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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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vfs_mountedfrom(vfsp, from);
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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_omount 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, td)
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struct mount *vfsp;
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int mntflags;
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struct thread *td;
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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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mi->mi_rootvp = NULL;
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vrele(coda_ctlvp);
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coda_ctlvp = NULL;
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active = coda_kill(vfsp, NOT_DOWNCALL);
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error = vflush(mi->mi_vfsp, 0, FORCECLOSE, td);
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#ifdef CODA_VERBOSE
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printf("coda_unmount: active = %d, vflush active %d\n", active, error);
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#endif
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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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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, flags, vpp, td)
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struct mount *vfsp;
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int flags;
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struct vnode **vpp;
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struct thread *td;
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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 = td->td_proc;
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CodaFid VFid;
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static const CodaFid invalfid = INVAL_FID;
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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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/*
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* Cache the root across calls. We only need to pass the request
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* on to Venus if the root vnode is the dummy we installed in
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* coda_omount() with all c_fid members zeroed.
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*
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* XXX In addition, we assume that the first call to coda_root()
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* is from vfs_omount()
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* (before the call to checkdirs()) and return the dummy root
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* node to avoid a deadlock. This bug is fixed in the Coda CVS
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* repository but not in any released versions as of 6 Mar 2003.
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*/
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if (memcmp(&VTOC(mi->mi_rootvp)->c_fid, &invalfid,
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sizeof(CodaFid)) != 0 || mi->mi_started == 0)
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{ /* Found valid root. */
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*vpp = mi->mi_rootvp;
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mi->mi_started = 1;
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/* On Mach, this is vref. On FreeBSD, vref + vn_lock. */
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vref(*vpp);
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vn_lock(*vpp, LK_EXCLUSIVE | LK_RETRY);
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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), td->td_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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vref(*vpp);
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vn_lock(*vpp, LK_EXCLUSIVE | LK_RETRY);
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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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vref(*vpp);
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vn_lock(*vpp, LK_EXCLUSIVE | LK_RETRY);
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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 filesystem statistics.
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*/
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int
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coda_nb_statfs(vfsp, sbp, td)
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register struct mount *vfsp;
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struct statfs *sbp;
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struct thread *td;
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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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/* 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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sbp->f_flags = 0;
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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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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, td)
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struct mount *vfsp;
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int waitfor;
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struct thread *td;
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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 thread *td = curthread; /* XXX -mach */
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struct proc *p = td->td_proc;
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CodaFid 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, td->td_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: %s type %d result %d\n",
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coda_f2s(&VFid), 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(CodaFid);
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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.
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*/
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if (mi->mi_vfsp == NULL)
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return ENODEV;
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return coda_fhtovp(mi->mi_vfsp, (struct fid*)&cfid, NULL, vpp,
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NULL, NULL);
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}
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struct vfsops coda_vfsops = {
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.vfs_mount = coda_mount,
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.vfs_root = coda_root,
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.vfs_statfs = coda_nb_statfs,
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.vfs_sync = coda_sync,
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.vfs_unmount = coda_unmount,
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};
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VFS_SET(coda_vfsops, coda, VFCF_NETWORK);
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