a176ceb322
these filesystems will support shared locks until they are explicitly modified to do so. Careful review must be done to ensure that this is safe for each individual filesystem. Sponsored by: Isilon Systems, Inc.
531 lines
14 KiB
C
531 lines
14 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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/*
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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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|
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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 <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",__func__))
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struct vnode *coda_ctlvp;
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|
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/* structure to keep statistics of internally generated/satisfied calls */
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|
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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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|
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extern int coda_nc_initialized; /* Set if cache has been initialized */
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extern int vc_nb_open(struct cdev *, int, int, struct thread *);
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|
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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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|
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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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|
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|
return 0;
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}
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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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|
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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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|
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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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* See if the device table matches our expectations.
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*/
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if (dev->si_devsw->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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/*
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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 (!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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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, 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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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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active = coda_kill(vfsp, NOT_DOWNCALL);
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ASSERT_VOP_LOCKED(mi->mi_rootvp, "coda_unmount");
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mi->mi_rootvp->v_vflag &= ~VV_ROOT;
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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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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, 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
|
|
* repository but not in any released versions as of 6 Mar 2003.
|
|
*/
|
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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;
|
|
|
|
/* 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, td);
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|
#else
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|
vget(*vpp, LK_EXCLUSIVE, td);
|
|
#endif
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|
MARK_INT_SAT(CODA_ROOT_STATS);
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|
return(0);
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|
}
|
|
}
|
|
|
|
error = venus_root(vftomi(vfsp), td->td_ucred, p, &VFid);
|
|
|
|
if (!error) {
|
|
/*
|
|
* Save the new rootfid in the cnode, and rehash the cnode into the
|
|
* cnode hash with the new fid key.
|
|
*/
|
|
coda_unsave(VTOC(mi->mi_rootvp));
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|
VTOC(mi->mi_rootvp)->c_fid = VFid;
|
|
coda_save(VTOC(mi->mi_rootvp));
|
|
|
|
*vpp = mi->mi_rootvp;
|
|
#if 1
|
|
vref(*vpp);
|
|
vn_lock(*vpp, LK_EXCLUSIVE, td);
|
|
#else
|
|
vget(*vpp, LK_EXCLUSIVE, td);
|
|
#endif
|
|
|
|
MARK_INT_SAT(CODA_ROOT_STATS);
|
|
goto exit;
|
|
} else if (error == ENODEV || error == EINTR) {
|
|
/* Gross hack here! */
|
|
/*
|
|
* 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,
|
|
* 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
|
|
* will fail.
|
|
*/
|
|
*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, td);
|
|
#else
|
|
vget(*vpp, LK_EXCLUSIVE, td);
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|
#endif
|
|
|
|
MARK_INT_FAIL(CODA_ROOT_STATS);
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error = 0;
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goto exit;
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|
} else {
|
|
CODADEBUG( CODA_ROOT, myprintf(("error %d in CODA_ROOT\n", error)); );
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MARK_INT_FAIL(CODA_ROOT_STATS);
|
|
|
|
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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* 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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|
{
|
|
ENTRY;
|
|
/* 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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|
}
|
|
|
|
bzero(sbp, sizeof(struct statfs));
|
|
/* XXX - what to do about f_flags, others? --bnoble */
|
|
/* Below This is what AFS does
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|
#define NB_SFS_SIZ 0x895440
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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 */
|
|
#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;
|
|
sbp->f_bavail = NB_SFS_SIZ;
|
|
sbp->f_files = NB_SFS_SIZ;
|
|
sbp->f_ffree = NB_SFS_SIZ;
|
|
bcopy((caddr_t)&(vfsp->mnt_stat.f_fsid), (caddr_t)&(sbp->f_fsid), sizeof (fsid_t));
|
|
snprintf(sbp->f_mntonname, sizeof(sbp->f_mntonname), "/coda");
|
|
snprintf(sbp->f_fstypename, sizeof(sbp->f_fstypename), "coda");
|
|
/* MARK_INT_SAT(CODA_STATFS_STATS); */
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* Flush any pending I/O.
|
|
*/
|
|
int
|
|
coda_sync(vfsp, waitfor, td)
|
|
struct mount *vfsp;
|
|
int waitfor;
|
|
struct thread *td;
|
|
{
|
|
ENTRY;
|
|
MARK_ENTRY(CODA_SYNC_STATS);
|
|
MARK_INT_SAT(CODA_SYNC_STATS);
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* fhtovp is now what vget used to be in 4.3-derived systems. For
|
|
* some silly reason, vget is now keyed by a 32 bit ino_t, rather than
|
|
* a type-specific fid.
|
|
*/
|
|
int
|
|
coda_fhtovp(vfsp, fhp, nam, vpp, exflagsp, creadanonp)
|
|
register struct mount *vfsp;
|
|
struct fid *fhp;
|
|
struct mbuf *nam;
|
|
struct vnode **vpp;
|
|
int *exflagsp;
|
|
struct ucred **creadanonp;
|
|
{
|
|
struct cfid *cfid = (struct cfid *)fhp;
|
|
struct cnode *cp = 0;
|
|
int error;
|
|
struct thread *td = curthread; /* XXX -mach */
|
|
struct proc *p = td->td_proc;
|
|
CodaFid VFid;
|
|
int vtype;
|
|
|
|
ENTRY;
|
|
|
|
MARK_ENTRY(CODA_VGET_STATS);
|
|
/* Check for vget of control object. */
|
|
if (IS_CTL_FID(&cfid->cfid_fid)) {
|
|
*vpp = coda_ctlvp;
|
|
vref(coda_ctlvp);
|
|
MARK_INT_SAT(CODA_VGET_STATS);
|
|
return(0);
|
|
}
|
|
|
|
error = venus_fhtovp(vftomi(vfsp), &cfid->cfid_fid, td->td_ucred, p, &VFid, &vtype);
|
|
|
|
if (error) {
|
|
CODADEBUG(CODA_VGET, myprintf(("vget error %d\n",error));)
|
|
*vpp = (struct vnode *)0;
|
|
} else {
|
|
CODADEBUG(CODA_VGET,
|
|
myprintf(("vget: %s type %d result %d\n",
|
|
coda_f2s(&VFid), vtype, error)); )
|
|
cp = make_coda_node(&VFid, vfsp, vtype);
|
|
*vpp = CTOV(cp);
|
|
}
|
|
return(error);
|
|
}
|
|
|
|
/*
|
|
* To allow for greater ease of use, some vnodes may be orphaned when
|
|
* Venus dies. Certain operations should still be allowed to go
|
|
* through, but without propagating ophan-ness. So this function will
|
|
* get a new vnode for the file from the current run of Venus. */
|
|
|
|
int
|
|
getNewVnode(vpp)
|
|
struct vnode **vpp;
|
|
{
|
|
struct cfid cfid;
|
|
struct coda_mntinfo *mi = vftomi((*vpp)->v_mount);
|
|
|
|
ENTRY;
|
|
|
|
cfid.cfid_len = (short)sizeof(CodaFid);
|
|
cfid.cfid_fid = VTOC(*vpp)->c_fid; /* Structure assignment. */
|
|
/* XXX ? */
|
|
|
|
/* We're guessing that if set, the 1st element on the list is a
|
|
* 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/extattr.h>
|
|
#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)
|
|
struct cdev *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 = {
|
|
.vfs_mount = coda_mount,
|
|
.vfs_root = coda_root,
|
|
.vfs_statfs = coda_nb_statfs,
|
|
.vfs_sync = coda_sync,
|
|
.vfs_unmount = coda_unmount,
|
|
};
|
|
|
|
VFS_SET(coda_vfsops, coda, VFCF_NETWORK);
|