9f80ce043d
Note that this does not actually enable full-range i/o requests for 64 architectures, and is done now to update KBI only. Tested by: pho Reviewed by: jhb, bde (as part of the review of the bigger patch)
675 lines
17 KiB
C
675 lines
17 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/coda/coda_psdev.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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* These routines define the psuedo device for communication between Coda's
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* Venus and Minicache in Mach 2.6. They used to be in cfs_subr.c, but I
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* moved them to make it easier to port the Minicache without porting coda.
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* -- DCS 10/12/94
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*/
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/*
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* These routines are the device entry points for Venus.
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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/ioccom.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/file.h> /* must come after sys/malloc.h */
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#include <sys/mount.h>
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#include <sys/mutex.h>
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#include <sys/poll.h>
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#include <sys/proc.h>
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#include <sys/filedesc.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_io.h>
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#include <fs/coda/coda_psdev.h>
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/*
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* Variables to determine how Coda sleeps and whether or not it is
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* interruptible when it does sleep waiting for Venus.
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*/
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/* #define CTL_C */
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#ifdef CTL_C
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#include <sys/signalvar.h>
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#endif
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int coda_psdev_print_entry = 0;
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static int outstanding_upcalls = 0;
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int coda_call_sleep = PZERO - 1;
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#ifdef CTL_C
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int coda_pcatch = PCATCH;
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#else
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#endif
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#define ENTRY do { \
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if (coda_psdev_print_entry) \
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myprintf(("Entered %s\n", __func__)); \
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} while (0)
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struct vmsg {
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TAILQ_ENTRY(vmsg) vm_chain;
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caddr_t vm_data;
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u_short vm_flags;
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u_short vm_inSize; /* Size is at most 5000 bytes */
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u_short vm_outSize;
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u_short vm_opcode; /* Copied from data to save ptr deref */
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int vm_unique;
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caddr_t vm_sleep; /* Not used by Mach. */
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};
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#define VM_READ 1
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#define VM_WRITE 2
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#define VM_INTR 4 /* Unused. */
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int
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vc_open(struct cdev *dev, int flag, int mode, struct thread *td)
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{
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struct vcomm *vcp;
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struct coda_mntinfo *mnt;
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ENTRY;
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mnt = dev2coda_mntinfo(dev);
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KASSERT(mnt, ("Coda: tried to open uninitialized cfs device"));
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vcp = &mnt->mi_vcomm;
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if (VC_OPEN(vcp))
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return (EBUSY);
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bzero(&(vcp->vc_selproc), sizeof (struct selinfo));
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TAILQ_INIT(&vcp->vc_requests);
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TAILQ_INIT(&vcp->vc_replies);
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MARK_VC_OPEN(vcp);
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mnt->mi_vfsp = NULL;
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mnt->mi_rootvp = NULL;
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return (0);
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}
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int
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vc_close(struct cdev *dev, int flag, int mode, struct thread *td)
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{
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struct vcomm *vcp;
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struct vmsg *vmp, *nvmp = NULL;
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struct coda_mntinfo *mi;
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int err;
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ENTRY;
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mi = dev2coda_mntinfo(dev);
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KASSERT(mi, ("Coda: closing unknown cfs device"));
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vcp = &mi->mi_vcomm;
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KASSERT(VC_OPEN(vcp), ("Coda: closing unopened cfs device"));
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/*
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* Prevent future operations on this vfs from succeeding by
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* auto-unmounting any vfs mounted via this device. This frees user
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* or sysadm from having to remember where all mount points are
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* located. Put this before WAKEUPs to avoid queuing new messages
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* between the WAKEUP and the unmount (which can happen if we're
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* unlucky).
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*/
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if (mi->mi_rootvp == NULL) {
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/*
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* Just a simple open/close with no mount.
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*/
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MARK_VC_CLOSED(vcp);
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return (0);
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}
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/*
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* Let unmount know this is for real.
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*/
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VTOC(mi->mi_rootvp)->c_flags |= C_UNMOUNTING;
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coda_unmounting(mi->mi_vfsp);
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/*
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* Wakeup clients so they can return.
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*/
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outstanding_upcalls = 0;
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TAILQ_FOREACH_SAFE(vmp, &vcp->vc_requests, vm_chain, nvmp) {
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/*
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* Free signal request messages and don't wakeup cause no one
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* is waiting.
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*/
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if (vmp->vm_opcode == CODA_SIGNAL) {
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CODA_FREE((caddr_t)vmp->vm_data,
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(u_int)VC_IN_NO_DATA);
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CODA_FREE((caddr_t)vmp, (u_int)sizeof(struct vmsg));
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continue;
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}
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outstanding_upcalls++;
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wakeup(&vmp->vm_sleep);
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}
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TAILQ_FOREACH(vmp, &vcp->vc_replies, vm_chain) {
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outstanding_upcalls++;
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wakeup(&vmp->vm_sleep);
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}
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MARK_VC_CLOSED(vcp);
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if (outstanding_upcalls) {
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#ifdef CODA_VERBOSE
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printf("presleep: outstanding_upcalls = %d\n",
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outstanding_upcalls);
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#endif
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(void) tsleep(&outstanding_upcalls, coda_call_sleep,
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"coda_umount", 0);
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#ifdef CODA_VERBOSE
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printf("postsleep: outstanding_upcalls = %d\n",
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outstanding_upcalls);
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#endif
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}
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err = dounmount(mi->mi_vfsp, flag, td);
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if (err)
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myprintf(("Error %d unmounting vfs in vcclose(%s)\n", err,
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devtoname(dev)));
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return (0);
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}
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int
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vc_read(struct cdev *dev, struct uio *uiop, int flag)
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{
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struct vcomm *vcp;
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struct vmsg *vmp;
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int error = 0;
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ENTRY;
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vcp = &dev2coda_mntinfo(dev)->mi_vcomm;
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/*
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* Get message at head of request queue.
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*/
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vmp = TAILQ_FIRST(&vcp->vc_requests);
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if (vmp == NULL)
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return (0); /* Nothing to read */
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/*
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* Move the input args into userspace.
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*
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* XXXRW: This is not safe in the presence of >1 reader, as vmp is
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* still on the head of the list.
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*/
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uiop->uio_rw = UIO_READ;
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error = uiomove(vmp->vm_data, vmp->vm_inSize, uiop);
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if (error) {
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myprintf(("vcread: error (%d) on uiomove\n", error));
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error = EINVAL;
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}
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TAILQ_REMOVE(&vcp->vc_requests, vmp, vm_chain);
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/*
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* If request was a signal, free up the message and don't enqueue it
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* in the reply queue.
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*/
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if (vmp->vm_opcode == CODA_SIGNAL) {
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if (codadebug)
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myprintf(("vcread: signal msg (%d, %d)\n",
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vmp->vm_opcode, vmp->vm_unique));
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CODA_FREE((caddr_t)vmp->vm_data, (u_int)VC_IN_NO_DATA);
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CODA_FREE((caddr_t)vmp, (u_int)sizeof(struct vmsg));
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return (error);
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}
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vmp->vm_flags |= VM_READ;
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TAILQ_INSERT_TAIL(&vcp->vc_replies, vmp, vm_chain);
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return (error);
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}
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int
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vc_write(struct cdev *dev, struct uio *uiop, int flag)
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{
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struct vcomm *vcp;
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struct vmsg *vmp;
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struct coda_out_hdr *out;
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u_long seq;
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u_long opcode;
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int buf[2];
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int error = 0;
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ENTRY;
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vcp = &dev2coda_mntinfo(dev)->mi_vcomm;
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/*
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* Peek at the opcode, unique without transfering the data.
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*/
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uiop->uio_rw = UIO_WRITE;
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error = uiomove((caddr_t)buf, sizeof(int) * 2, uiop);
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if (error) {
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myprintf(("vcwrite: error (%d) on uiomove\n", error));
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return (EINVAL);
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}
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opcode = buf[0];
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seq = buf[1];
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if (codadebug)
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myprintf(("vcwrite got a call for %ld.%ld\n", opcode, seq));
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if (DOWNCALL(opcode)) {
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union outputArgs pbuf;
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/*
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* Get the rest of the data.
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*/
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uiop->uio_rw = UIO_WRITE;
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error = uiomove((caddr_t)&pbuf.coda_purgeuser.oh.result,
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sizeof(pbuf) - (sizeof(int)*2), uiop);
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if (error) {
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myprintf(("vcwrite: error (%d) on uiomove (Op %ld "
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"seq %ld)\n", error, opcode, seq));
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return (EINVAL);
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}
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return (handleDownCall(dev2coda_mntinfo(dev), opcode, &pbuf));
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}
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/*
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* Look for the message on the (waiting for) reply queue.
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*/
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TAILQ_FOREACH(vmp, &vcp->vc_replies, vm_chain) {
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if (vmp->vm_unique == seq)
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break;
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}
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if (vmp == NULL) {
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if (codadebug)
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myprintf(("vcwrite: msg (%ld, %ld) not found\n",
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opcode, seq));
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return (ESRCH);
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}
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/*
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* Remove the message from the reply queue.
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*/
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TAILQ_REMOVE(&vcp->vc_replies, vmp, vm_chain);
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/*
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* Move data into response buffer.
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*/
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out = (struct coda_out_hdr *)vmp->vm_data;
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/*
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* Don't need to copy opcode and uniquifier.
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*
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* Get the rest of the data.
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*/
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if (vmp->vm_outSize < uiop->uio_resid) {
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myprintf(("vcwrite: more data than asked for (%d < %zd)\n",
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vmp->vm_outSize, uiop->uio_resid));
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/*
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* Notify caller of the error.
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*/
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wakeup(&vmp->vm_sleep);
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return (EINVAL);
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}
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/*
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* Save the value.
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*/
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buf[0] = uiop->uio_resid;
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uiop->uio_rw = UIO_WRITE;
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error = uiomove((caddr_t) &out->result, vmp->vm_outSize -
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(sizeof(int) * 2), uiop);
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if (error) {
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myprintf(("vcwrite: error (%d) on uiomove (op %ld seq %ld)\n",
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error, opcode, seq));
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return (EINVAL);
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}
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/*
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* I don't think these are used, but just in case.
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*
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* XXX - aren't these two already correct? -bnoble
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*/
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out->opcode = opcode;
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out->unique = seq;
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vmp->vm_outSize = buf[0]; /* Amount of data transferred? */
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vmp->vm_flags |= VM_WRITE;
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error = 0;
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if (opcode == CODA_OPEN_BY_FD) {
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struct coda_open_by_fd_out *tmp =
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(struct coda_open_by_fd_out *)out;
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struct file *fp;
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struct vnode *vp = NULL;
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if (tmp->oh.result == 0) {
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error = getvnode(uiop->uio_td->td_proc->p_fd,
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tmp->fd, &fp);
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if (!error) {
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/*
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* XXX: Since the whole driver runs with
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* Giant, don't actually need to acquire it
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* explicitly here yet.
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*/
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mtx_lock(&Giant);
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vp = fp->f_vnode;
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VREF(vp);
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fdrop(fp, uiop->uio_td);
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mtx_unlock(&Giant);
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}
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}
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tmp->vp = vp;
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}
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wakeup(&vmp->vm_sleep);
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return (error);
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}
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int
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vc_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag,
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struct thread *t)
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{
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ENTRY;
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switch(cmd) {
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case CODARESIZE:
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return (ENODEV);
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case CODASTATS:
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return (ENODEV);
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case CODAPRINT:
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return (ENODEV);
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case CIOC_KERNEL_VERSION:
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switch (*(u_int *)addr) {
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case 0:
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*(u_int *)addr = coda_kernel_version;
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return (0);
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case 1:
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case 2:
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if (coda_kernel_version != *(u_int *)addr)
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return (ENOENT);
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else
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return (0);
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default:
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return (ENOENT);
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}
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default:
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return (EINVAL);
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}
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}
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int
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vc_poll(struct cdev *dev, int events, struct thread *td)
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{
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struct vcomm *vcp;
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int event_msk = 0;
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ENTRY;
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vcp = &dev2coda_mntinfo(dev)->mi_vcomm;
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event_msk = events & (POLLIN|POLLRDNORM);
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if (!event_msk)
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return (0);
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if (!TAILQ_EMPTY(&vcp->vc_requests))
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return (events & (POLLIN|POLLRDNORM));
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selrecord(td, &(vcp->vc_selproc));
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return (0);
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}
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/*
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* Statistics.
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*/
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struct coda_clstat coda_clstat;
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/*
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* Key question: whether to sleep interuptably or uninteruptably when waiting
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* for Venus. The former seems better (cause you can ^C a job), but then
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* GNU-EMACS completion breaks. Use tsleep with no timeout, and no longjmp
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* happens. But, when sleeping "uninterruptibly", we don't get told if it
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* returns abnormally (e.g. kill -9).
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*/
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int
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coda_call(struct coda_mntinfo *mntinfo, int inSize, int *outSize,
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caddr_t buffer)
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{
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struct vcomm *vcp;
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struct vmsg *vmp;
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int error;
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#ifdef CTL_C
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struct thread *td = curthread;
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struct proc *p = td->td_proc;
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sigset_t psig_omask;
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sigset_t tempset;
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int i;
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#endif
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/*
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* Unlikely, but could be a race condition with a dying warden.
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*/
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if (mntinfo == NULL)
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return ENODEV;
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vcp = &(mntinfo->mi_vcomm);
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coda_clstat.ncalls++;
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coda_clstat.reqs[((struct coda_in_hdr *)buffer)->opcode]++;
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if (!VC_OPEN(vcp))
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return (ENODEV);
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CODA_ALLOC(vmp,struct vmsg *,sizeof(struct vmsg));
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/*
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* Format the request message.
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*/
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vmp->vm_data = buffer;
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vmp->vm_flags = 0;
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vmp->vm_inSize = inSize;
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vmp->vm_outSize
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= *outSize ? *outSize : inSize; /* |buffer| >= inSize */
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vmp->vm_opcode = ((struct coda_in_hdr *)buffer)->opcode;
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vmp->vm_unique = ++vcp->vc_seq;
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if (codadebug)
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myprintf(("Doing a call for %d.%d\n", vmp->vm_opcode,
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vmp->vm_unique));
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/*
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* Fill in the common input args.
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*/
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((struct coda_in_hdr *)buffer)->unique = vmp->vm_unique;
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/*
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* Append msg to request queue and poke Venus.
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*/
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TAILQ_INSERT_TAIL(&vcp->vc_requests, vmp, vm_chain);
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selwakeuppri(&(vcp->vc_selproc), coda_call_sleep);
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/*
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* We can be interrupted while we wait for Venus to process our
|
|
* request. If the interrupt occurs before Venus has read the
|
|
* request, we dequeue and return. If it occurs after the read but
|
|
* before the reply, we dequeue, send a signal message, and return.
|
|
* If it occurs after the reply we ignore it. In no case do we want
|
|
* to restart the syscall. If it was interrupted by a venus shutdown
|
|
* (vcclose), return ENODEV.
|
|
*
|
|
* Ignore return, we have to check anyway.
|
|
*/
|
|
#ifdef CTL_C
|
|
/*
|
|
* This is work in progress. Setting coda_pcatch lets tsleep
|
|
* reawaken on a ^c or ^z. The problem is that emacs sets certain
|
|
* interrupts as SA_RESTART. This means that we should exit sleep
|
|
* handle the "signal" and then go to sleep again. Mostly this is
|
|
* done by letting the syscall complete and be restarted. We are not
|
|
* idempotent and can not do this. A better solution is necessary.
|
|
*/
|
|
i = 0;
|
|
PROC_LOCK(p);
|
|
psig_omask = td->td_sigmask;
|
|
do {
|
|
error = msleep(&vmp->vm_sleep, &p->p_mtx,
|
|
(coda_call_sleep|coda_pcatch), "coda_call", hz*2);
|
|
if (error == 0)
|
|
break;
|
|
else if (error == EWOULDBLOCK) {
|
|
#ifdef CODA_VERBOSE
|
|
printf("coda_call: tsleep TIMEOUT %d sec\n", 2+2*i);
|
|
#endif
|
|
}
|
|
else {
|
|
SIGEMPTYSET(tempset);
|
|
SIGADDSET(tempset, SIGIO);
|
|
if (SIGSETEQ(td->td_siglist, tempset)) {
|
|
SIGADDSET(td->td_sigmask, SIGIO);
|
|
#ifdef CODA_VERBOSE
|
|
printf("coda_call: tsleep returns %d SIGIO, "
|
|
"cnt %d\n", error, i);
|
|
#endif
|
|
} else {
|
|
SIGDELSET(tempset, SIGIO);
|
|
SIGADDSET(tempset, SIGALRM);
|
|
if (SIGSETEQ(td->td_siglist, tempset)) {
|
|
SIGADDSET(td->td_sigmask, SIGALRM);
|
|
#ifdef CODA_VERBOSE
|
|
printf("coda_call: tsleep returns "
|
|
"%d SIGALRM, cnt %d\n", error, i);
|
|
#endif
|
|
} else {
|
|
#ifdef CODA_VERBOSE
|
|
printf("coda_call: tsleep returns "
|
|
"%d, cnt %d\n", error, i);
|
|
#endif
|
|
|
|
#ifdef notyet
|
|
tempset = td->td_siglist;
|
|
SIGSETNAND(tempset, td->td_sigmask);
|
|
printf("coda_call: siglist = %p, "
|
|
"sigmask = %p, mask %p\n",
|
|
td->td_siglist, td->td_sigmask,
|
|
tempset);
|
|
break;
|
|
SIGSETOR(td->td_sigmask, td->td_siglist);
|
|
tempset = td->td_siglist;
|
|
SIGSETNAND(tempset, td->td_sigmask);
|
|
printf("coda_call: new mask, "
|
|
"siglist = %p, sigmask = %p, "
|
|
"mask %p\n", td->td_siglist,
|
|
td->td_sigmask, tempset);
|
|
#endif
|
|
}
|
|
}
|
|
}
|
|
} while (error && i++ < 128 && VC_OPEN(vcp));
|
|
td->td_sigmask = psig_omask;
|
|
signotify(td);
|
|
PROC_UNLOCK(p);
|
|
#else
|
|
(void)tsleep(&vmp->vm_sleep, coda_call_sleep, "coda_call", 0);
|
|
#endif
|
|
if (VC_OPEN(vcp)) {
|
|
/*
|
|
* Venus is still alive.
|
|
*
|
|
* Op went through, interrupt or not...
|
|
*/
|
|
if (vmp->vm_flags & VM_WRITE) {
|
|
error = 0;
|
|
*outSize = vmp->vm_outSize;
|
|
} else if (!(vmp->vm_flags & VM_READ)) {
|
|
/* Interrupted before venus read it. */
|
|
#ifdef CODA_VERBOSE
|
|
if (1)
|
|
#else
|
|
if (codadebug)
|
|
#endif
|
|
myprintf(("interrupted before read: op = "
|
|
"%d.%d, flags = %x\n", vmp->vm_opcode,
|
|
vmp->vm_unique, vmp->vm_flags));
|
|
TAILQ_REMOVE(&vcp->vc_requests, vmp, vm_chain);
|
|
error = EINTR;
|
|
} else {
|
|
/*
|
|
* (!(vmp->vm_flags & VM_WRITE)) means interrupted
|
|
* after upcall started.
|
|
*
|
|
* Interrupted after start of upcall, send venus a
|
|
* signal.
|
|
*/
|
|
struct coda_in_hdr *dog;
|
|
struct vmsg *svmp;
|
|
|
|
#ifdef CODA_VERBOSE
|
|
if (1)
|
|
#else
|
|
if (codadebug)
|
|
#endif
|
|
myprintf(("Sending Venus a signal: op = "
|
|
"%d.%d, flags = %x\n", vmp->vm_opcode,
|
|
vmp->vm_unique, vmp->vm_flags));
|
|
TAILQ_REMOVE(&vcp->vc_requests, vmp, vm_chain);
|
|
error = EINTR;
|
|
CODA_ALLOC(svmp, struct vmsg *, sizeof(struct vmsg));
|
|
CODA_ALLOC((svmp->vm_data), char *,
|
|
sizeof(struct coda_in_hdr));
|
|
dog = (struct coda_in_hdr *)svmp->vm_data;
|
|
svmp->vm_flags = 0;
|
|
dog->opcode = svmp->vm_opcode = CODA_SIGNAL;
|
|
dog->unique = svmp->vm_unique = vmp->vm_unique;
|
|
svmp->vm_inSize = sizeof (struct coda_in_hdr);
|
|
/*??? rvb */ svmp->vm_outSize = sizeof (struct coda_in_hdr);
|
|
if (codadebug)
|
|
myprintf(("coda_call: enqueing signal msg "
|
|
"(%d, %d)\n", svmp->vm_opcode,
|
|
svmp->vm_unique));
|
|
|
|
/*
|
|
* Insert at head of queue!
|
|
*
|
|
* XXXRW: Actually, the tail.
|
|
*/
|
|
TAILQ_INSERT_TAIL(&vcp->vc_requests, svmp, vm_chain);
|
|
selwakeuppri(&(vcp->vc_selproc), coda_call_sleep);
|
|
}
|
|
} else {
|
|
/* If venus died (!VC_OPEN(vcp)) */
|
|
if (codadebug)
|
|
myprintf(("vcclose woke op %d.%d flags %d\n",
|
|
vmp->vm_opcode, vmp->vm_unique, vmp->vm_flags));
|
|
error = ENODEV;
|
|
}
|
|
CODA_FREE(vmp, sizeof(struct vmsg));
|
|
if (outstanding_upcalls > 0 && (--outstanding_upcalls == 0))
|
|
wakeup(&outstanding_upcalls);
|
|
if (!error)
|
|
error = ((struct coda_out_hdr *)buffer)->result;
|
|
return (error);
|
|
}
|