Kernel - remove the old specfs trialings.
authorMatthew Dillon <dillon@apollo.backplane.com>
Tue, 1 Sep 2009 18:21:28 +0000 (11:21 -0700)
committerMatthew Dillon <dillon@apollo.backplane.com>
Tue, 1 Sep 2009 18:21:28 +0000 (11:21 -0700)
sys/vfs/specfs/spec_vnops.c [deleted file]

diff --git a/sys/vfs/specfs/spec_vnops.c b/sys/vfs/specfs/spec_vnops.c
deleted file mode 100644 (file)
index bf679cb..0000000
+++ /dev/null
@@ -1,989 +0,0 @@
-/*
- * Copyright (c) 1989, 1993, 1995
- *     The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- *    must display the following acknowledgement:
- *     This product includes software developed by the University of
- *     California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- *     @(#)spec_vnops.c        8.14 (Berkeley) 5/21/95
- * $FreeBSD: src/sys/miscfs/specfs/spec_vnops.c,v 1.131.2.4 2001/02/26 04:23:20 jlemon Exp $
- * $DragonFly: src/sys/vfs/specfs/spec_vnops.c,v 1.58 2008/05/06 00:14:12 dillon Exp $
- */
-
-#include <sys/param.h>
-#include <sys/proc.h>
-#include <sys/systm.h>
-#include <sys/kernel.h>
-#include <sys/conf.h>
-#include <sys/buf.h>
-#include <sys/device.h>
-#include <sys/mount.h>
-#include <sys/vnode.h>
-#include <sys/stat.h>
-#include <sys/fcntl.h>
-#include <sys/vmmeter.h>
-#include <sys/bus.h>
-#include <sys/tty.h>
-
-#include <vm/vm.h>
-#include <vm/vm_object.h>
-#include <vm/vm_page.h>
-#include <vm/vm_pager.h>
-
-#include <machine/limits.h>
-
-#include <sys/buf2.h>
-
-#include <sys/thread2.h>
-
-/*
- * Specfs chained debugging (bitmask)
- *
- * 0 - disable debugging
- * 1 - report chained I/Os
- * 2 - force 4K chained I/Os
- */
-#define SPEC_CHAIN_DEBUG       0
-
-static int     spec_advlock (struct vop_advlock_args *);  
-static int     spec_bmap (struct vop_bmap_args *);
-static int     spec_close (struct vop_close_args *);
-static int     spec_freeblks (struct vop_freeblks_args *);
-static int     spec_fsync (struct  vop_fsync_args *);
-static int     spec_getpages (struct vop_getpages_args *);
-static int     spec_inactive (struct  vop_inactive_args *);
-static int     spec_ioctl (struct vop_ioctl_args *);
-static int     spec_open (struct vop_open_args *);
-static int     spec_poll (struct vop_poll_args *);
-static int     spec_kqfilter (struct vop_kqfilter_args *);
-static int     spec_print (struct vop_print_args *);
-static int     spec_read (struct vop_read_args *);  
-static int     spec_strategy (struct vop_strategy_args *);
-static int     spec_write (struct vop_write_args *);
-static void    spec_strategy_done(struct bio *nbio);
-static int     spec_getattr (struct vop_getattr_args *);
-
-struct vop_ops spec_vnode_vops = {
-       .vop_default =          vop_defaultop,
-       .vop_access =           (void *)vop_ebadf,
-       .vop_advlock =          spec_advlock,
-       .vop_bmap =             spec_bmap,
-       .vop_close =            spec_close,
-       .vop_old_create =       (void *)vop_panic,
-       .vop_freeblks =         spec_freeblks,
-       .vop_fsync =            spec_fsync,
-       .vop_getpages =         spec_getpages,
-       .vop_inactive =         spec_inactive,
-       .vop_ioctl =            spec_ioctl,
-       .vop_old_link =         (void *)vop_panic,
-       .vop_old_mkdir =        (void *)vop_panic,
-       .vop_old_mknod =        (void *)vop_panic,
-       .vop_open =             spec_open,
-       .vop_pathconf =         vop_stdpathconf,
-       .vop_poll =             spec_poll,
-       .vop_kqfilter =         spec_kqfilter,
-       .vop_print =            spec_print,
-       .vop_read =             spec_read,
-       .vop_readdir =          (void *)vop_panic,
-       .vop_readlink =         (void *)vop_panic,
-       .vop_reallocblks =      (void *)vop_panic,
-       .vop_reclaim =          (void *)vop_null,
-       .vop_old_remove =       (void *)vop_panic,
-       .vop_old_rename =       (void *)vop_panic,
-       .vop_old_rmdir =        (void *)vop_panic,
-       .vop_setattr =          (void *)vop_ebadf,
-       .vop_getattr =          spec_getattr,
-       .vop_strategy =         spec_strategy,
-       .vop_old_symlink =      (void *)vop_panic,
-       .vop_write =            spec_write
-};
-
-struct vop_ops *spec_vnode_vops_p = &spec_vnode_vops;
-
-VNODEOP_SET(spec_vnode_vops);
-
-extern int dev_ref_debug;
-
-/*
- * spec_vnoperate()
- */
-int
-spec_vnoperate(struct vop_generic_args *ap)
-{
-       return (VOCALL(&spec_vnode_vops, ap));
-}
-
-/*
- * Open a special file.
- *
- * spec_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred,
- *          struct file *a_fp)
- */
-/* ARGSUSED */
-static int
-spec_open(struct vop_open_args *ap)
-{
-       struct vnode *vp = ap->a_vp;
-       cdev_t dev;
-       int error;
-       const char *cp;
-
-       /*
-        * Don't allow open if fs is mounted -nodev.
-        */
-       if (vp->v_mount && (vp->v_mount->mnt_flag & MNT_NODEV))
-               return (ENXIO);
-       if (vp->v_type == VBLK)
-               return (ENXIO);
-
-       /*
-        * Resolve the device.  If the vnode is already open v_rdev may
-        * already be resolved.  However, if the device changes out from
-        * under us we report it (and, for now, we allow it).  Since
-        * v_release_rdev() zero's v_opencount, we have to save and restore
-        * it when replacing the rdev reference.
-        */
-       if (vp->v_rdev != NULL) {
-               dev = get_dev(vp->v_umajor, vp->v_uminor);
-               if (dev != vp->v_rdev) {
-                       int oc = vp->v_opencount;
-                       kprintf(
-                           "Warning: spec_open: dev %s was lost",
-                           vp->v_rdev->si_name);
-                       v_release_rdev(vp);
-                       error = v_associate_rdev(vp, 
-                                       get_dev(vp->v_umajor, vp->v_uminor));
-                       if (error) {
-                               kprintf(", reacquisition failed\n");
-                       } else {
-                               vp->v_opencount = oc;
-                               kprintf(", reacquisition successful\n");
-                       }
-               } else {
-                       error = 0;
-               }
-       } else {
-               error = v_associate_rdev(vp, get_dev(vp->v_umajor, vp->v_uminor));
-       }
-       if (error)
-               return(error);
-
-       /*
-        * Prevent degenerate open/close sequences from nulling out rdev.
-        */
-       dev = vp->v_rdev;
-       KKASSERT(dev != NULL);
-
-       /*
-        * Make this field valid before any I/O in ->d_open.  XXX the
-        * device itself should probably be required to initialize
-        * this field in d_open.
-        */
-       if (!dev->si_iosize_max)
-               dev->si_iosize_max = DFLTPHYS;
-
-       /*
-        * XXX: Disks get special billing here, but it is mostly wrong.
-        * XXX: diskpartitions can overlap and the real checks should
-        * XXX: take this into account, and consequently they need to
-        * XXX: live in the diskslicing code.  Some checks do.
-        */
-       if (vn_isdisk(vp, NULL) && ap->a_cred != FSCRED && 
-           (ap->a_mode & FWRITE)) {
-               /*
-                * Never allow opens for write if the device is mounted R/W
-                */
-               if (vp->v_rdev && vp->v_rdev->si_mountpoint &&
-                   !(vp->v_rdev->si_mountpoint->mnt_flag & MNT_RDONLY)) {
-                               error = EBUSY;
-                               goto done;
-               }
-
-               /*
-                * When running in secure mode, do not allow opens
-                * for writing if the device is mounted
-                */
-               if (securelevel >= 1 && vfs_mountedon(vp)) {
-                       error = EPERM;
-                       goto done;
-               }
-
-               /*
-                * When running in very secure mode, do not allow
-                * opens for writing of any devices.
-                */
-               if (securelevel >= 2) {
-                       error = EPERM;
-                       goto done;
-               }
-       }
-
-       /* XXX: Special casing of ttys for deadfs.  Probably redundant */
-       if (dev_dflags(dev) & D_TTY)
-               vp->v_flag |= VISTTY;
-       if ((dev_dflags(dev) & D_SEEKABLE) == 0)
-               vp->v_flag |= VNOTSEEKABLE;
-
-       /*
-        * dev_dopen() is always called for each open.  dev_dclose() is
-        * only called for the last close unless D_TRACKCLOSE is set.
-        */
-       vn_unlock(vp);
-       error = dev_dopen(dev, ap->a_mode, S_IFCHR, ap->a_cred);
-       vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
-
-       if (error)
-               goto done;
-
-       if (dev_dflags(dev) & D_TTY) {
-               if (dev->si_tty) {
-                       struct tty *tp;
-                       tp = dev->si_tty;
-                       if (!tp->t_stop) {
-                               kprintf("Warning:%s: no t_stop, using nottystop\n", devtoname(dev));
-                               tp->t_stop = nottystop;
-                       }
-               }
-       }
-
-       /*
-        * If this is 'disk' or disk-like device, associate a VM object
-        * with it.
-        */
-       if (vn_isdisk(vp, NULL)) {
-               if (!dev->si_bsize_phys)
-                       dev->si_bsize_phys = DEV_BSIZE;
-               vinitvmio(vp, IDX_TO_OFF(INT_MAX));
-       }
-       if ((dev_dflags(dev) & D_DISK) == 0) {
-               cp = devtoname(dev);
-               if (*cp == '#') {
-                       kprintf("WARNING: driver %s should register devices with make_dev() (cdev_t = \"%s\")\n",
-                           dev_dname(dev), cp);
-               }
-       }
-
-       /*
-        * If we were handed a file pointer we may be able to install a
-        * shortcut which issues device read and write operations directly
-        * from the fileops rather then having to go through spec_read()
-        * and spec_write().
-        */
-       if (ap->a_fp)
-               vn_setspecops(ap->a_fp);
-
-       if (dev_ref_debug)
-               kprintf("spec_open: %s %d\n", dev->si_name, vp->v_opencount);
-done:
-       if (error) {
-               if (vp->v_opencount == 0)
-                       v_release_rdev(vp);
-       } else {
-               vop_stdopen(ap);
-       }
-       return (error);
-}
-
-/*
- * Vnode op for read
- *
- * spec_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
- *          struct ucred *a_cred)
- */
-/* ARGSUSED */
-static int
-spec_read(struct vop_read_args *ap)
-{
-       struct vnode *vp;
-       struct thread *td;
-       struct uio *uio;
-       cdev_t dev;
-       int error;
-
-       vp = ap->a_vp;
-       dev = vp->v_rdev;
-       uio = ap->a_uio;
-       td = uio->uio_td;
-
-       if (dev == NULL)                /* device was revoked */
-               return (EBADF);
-       if (uio->uio_resid == 0)
-               return (0);
-
-       vn_unlock(vp);
-       error = dev_dread(dev, uio, ap->a_ioflag);
-       vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
-       return (error);
-}
-
-/*
- * Vnode op for write
- *
- * spec_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
- *           struct ucred *a_cred)
- */
-/* ARGSUSED */
-static int
-spec_write(struct vop_write_args *ap)
-{
-       struct vnode *vp;
-       struct thread *td;
-       struct uio *uio;
-       cdev_t dev;
-       int error;
-
-       vp = ap->a_vp;
-       dev = vp->v_rdev;
-       uio = ap->a_uio;
-       td = uio->uio_td;
-
-       KKASSERT(uio->uio_segflg != UIO_NOCOPY);
-
-       if (dev == NULL)                /* device was revoked */
-               return (EBADF);
-
-       vn_unlock(vp);
-       error = dev_dwrite(dev, uio, ap->a_ioflag);
-       vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
-       return (error);
-}
-
-/*
- * This call modifying an upper layer filesystem's idea of the owner only.
- * It does NOT replace the upper layer filesystem's getattr.
- *
- * XXX spec_getattr() - TEMPORARY - remove when devfs is fully installed.
- *                     This is a horrible hack.  The code will get confused
- *                     if root chown's a tty device and then fails to chown
- *                     it back after finishing with it.  Non-root chowns are
- *                     strictly stored in the device and don't have the issue.
- */
-static int
-spec_getattr (struct vop_getattr_args *ap)
-{
-       struct vattr *vap = ap->a_vap;
-       struct vnode *vp = ap->a_vp;
-       cdev_t dev;
-
-       if (vp->v_type != VCHR)
-               return (0);
-       if ((dev = vp->v_rdev) == NULL) {
-               if ((dev = vp->v_rdev) == NULL)
-                       dev = get_dev(vp->v_umajor, vp->v_uminor);
-               if (dev == NULL)
-                       return (0);
-       }
-       if (vap->va_uid == 0) {
-               vap->va_uid = dev->si_uid;
-       }
-       return (0);
-}
-
-/*
- * Device ioctl operation.
- *
- * spec_ioctl(struct vnode *a_vp, int a_command, caddr_t a_data,
- *           int a_fflag, struct ucred *a_cred)
- */
-/* ARGSUSED */
-static int
-spec_ioctl(struct vop_ioctl_args *ap)
-{
-       cdev_t dev;
-
-       if ((dev = ap->a_vp->v_rdev) == NULL)
-               return (EBADF);         /* device was revoked */
-
-       return (dev_dioctl(dev, ap->a_command, ap->a_data,
-                   ap->a_fflag, ap->a_cred));
-}
-
-/*
- * spec_poll(struct vnode *a_vp, int a_events, struct ucred *a_cred)
- */
-/* ARGSUSED */
-static int
-spec_poll(struct vop_poll_args *ap)
-{
-       cdev_t dev;
-
-       if ((dev = ap->a_vp->v_rdev) == NULL)
-               return (EBADF);         /* device was revoked */
-       return (dev_dpoll(dev, ap->a_events));
-}
-
-/*
- * spec_kqfilter(struct vnode *a_vp, struct knote *a_kn)
- */
-/* ARGSUSED */
-static int
-spec_kqfilter(struct vop_kqfilter_args *ap)
-{
-       cdev_t dev;
-
-       if ((dev = ap->a_vp->v_rdev) == NULL)
-               return (EBADF);         /* device was revoked */
-       return (dev_dkqfilter(dev, ap->a_kn));
-}
-
-/*
- * Synch buffers associated with a block device
- *
- * spec_fsync(struct vnode *a_vp, int a_waitfor)
- */
-/* ARGSUSED */
-static int
-spec_fsync(struct vop_fsync_args *ap)
-{
-       struct vnode *vp = ap->a_vp;
-       int error;
-
-       if (!vn_isdisk(vp, NULL))
-               return (0);
-
-       /*
-        * Flush all dirty buffers associated with a block device.
-        */
-       error = vfsync(vp, ap->a_waitfor, 10000, NULL, NULL);
-       return (error);
-}
-
-/*
- * spec_inactive(struct vnode *a_vp)
- */
-static int
-spec_inactive(struct vop_inactive_args *ap)
-{
-       return (0);
-}
-
-/*
- * Convert a vnode strategy call into a device strategy call.  Vnode strategy
- * calls are not limited to device DMA limits so we have to deal with the
- * case.
- *
- * spec_strategy(struct vnode *a_vp, struct bio *a_bio)
- */
-static int
-spec_strategy(struct vop_strategy_args *ap)
-{
-       struct bio *bio = ap->a_bio;
-       struct buf *bp = bio->bio_buf;
-       struct buf *nbp;
-       struct vnode *vp;
-       struct mount *mp;
-       int chunksize;
-       int maxiosize;
-
-       if (bp->b_cmd != BUF_CMD_READ && LIST_FIRST(&bp->b_dep) != NULL)
-               buf_start(bp);
-
-       /*
-        * Collect statistics on synchronous and asynchronous read
-        * and write counts for disks that have associated filesystems.
-        */
-       vp = ap->a_vp;
-       KKASSERT(vp->v_rdev != NULL);   /* XXX */
-       if (vn_isdisk(vp, NULL) && (mp = vp->v_rdev->si_mountpoint) != NULL) {
-               if (bp->b_cmd == BUF_CMD_READ) {
-                       if (bio->bio_flags & BIO_SYNC)
-                               mp->mnt_stat.f_syncreads++;
-                       else
-                               mp->mnt_stat.f_asyncreads++;
-               } else {
-                       if (bio->bio_flags & BIO_SYNC)
-                               mp->mnt_stat.f_syncwrites++;
-                       else
-                               mp->mnt_stat.f_asyncwrites++;
-               }
-       }
-
-        /*
-         * Device iosize limitations only apply to read and write.  Shortcut
-         * the I/O if it fits.
-         */
-       if ((maxiosize = vp->v_rdev->si_iosize_max) == 0) {
-               kprintf("%s: si_iosize_max not set!\n", dev_dname(vp->v_rdev));
-               maxiosize = MAXPHYS;
-       }
-#if SPEC_CHAIN_DEBUG & 2
-       maxiosize = 4096;
-#endif
-        if (bp->b_bcount <= maxiosize ||
-            (bp->b_cmd != BUF_CMD_READ && bp->b_cmd != BUF_CMD_WRITE)) {
-                dev_dstrategy_chain(vp->v_rdev, bio);
-                return (0);
-        }
-
-       /*
-        * Clone the buffer and set up an I/O chain to chunk up the I/O.
-        */
-       nbp = kmalloc(sizeof(*bp), M_DEVBUF, M_INTWAIT|M_ZERO);
-       initbufbio(nbp);
-       buf_dep_init(nbp);
-       BUF_LOCKINIT(nbp);
-       BUF_LOCK(nbp, LK_EXCLUSIVE);
-       BUF_KERNPROC(nbp);
-       nbp->b_vp = vp;
-       nbp->b_flags = B_PAGING | (bp->b_flags & B_BNOCLIP);
-       nbp->b_data = bp->b_data;
-       nbp->b_bio1.bio_done = spec_strategy_done;
-       nbp->b_bio1.bio_offset = bio->bio_offset;
-       nbp->b_bio1.bio_caller_info1.ptr = bio;
-
-       /*
-        * Start the first transfer
-        */
-       if (vn_isdisk(vp, NULL))
-               chunksize = vp->v_rdev->si_bsize_phys;
-       else
-               chunksize = DEV_BSIZE;
-       chunksize = maxiosize / chunksize * chunksize;
-#if SPEC_CHAIN_DEBUG & 1
-       kprintf("spec_strategy chained I/O chunksize=%d\n", chunksize);
-#endif
-       nbp->b_cmd = bp->b_cmd;
-       nbp->b_bcount = chunksize;
-       nbp->b_bufsize = chunksize;     /* used to detect a short I/O */
-       nbp->b_bio1.bio_caller_info2.index = chunksize;
-
-#if SPEC_CHAIN_DEBUG & 1
-       kprintf("spec_strategy: chain %p offset %d/%d bcount %d\n",
-               bp, 0, bp->b_bcount, nbp->b_bcount);
-#endif
-
-       dev_dstrategy(vp->v_rdev, &nbp->b_bio1);
-       return (0);
-}
-
-/*
- * Chunked up transfer completion routine - chain transfers until done
- */
-static
-void
-spec_strategy_done(struct bio *nbio)
-{
-       struct buf *nbp = nbio->bio_buf;
-       struct bio *bio = nbio->bio_caller_info1.ptr;   /* original bio */
-       struct buf *bp = bio->bio_buf;                  /* original bp */
-       int chunksize = nbio->bio_caller_info2.index;   /* chunking */
-       int boffset = nbp->b_data - bp->b_data;
-
-       if (nbp->b_flags & B_ERROR) {
-               /*
-                * An error terminates the chain, propogate the error back
-                * to the original bp
-                */
-               bp->b_flags |= B_ERROR;
-               bp->b_error = nbp->b_error;
-               bp->b_resid = bp->b_bcount - boffset +
-                             (nbp->b_bcount - nbp->b_resid);
-#if SPEC_CHAIN_DEBUG & 1
-               kprintf("spec_strategy: chain %p error %d bcount %d/%d\n",
-                       bp, bp->b_error, bp->b_bcount,
-                       bp->b_bcount - bp->b_resid);
-#endif
-               kfree(nbp, M_DEVBUF);
-               biodone(bio);
-       } else if (nbp->b_resid) {
-               /*
-                * A short read or write terminates the chain
-                */
-               bp->b_error = nbp->b_error;
-               bp->b_resid = bp->b_bcount - boffset +
-                             (nbp->b_bcount - nbp->b_resid);
-#if SPEC_CHAIN_DEBUG & 1
-               kprintf("spec_strategy: chain %p short read(1) bcount %d/%d\n",
-                       bp, bp->b_bcount - bp->b_resid, bp->b_bcount);
-#endif
-               kfree(nbp, M_DEVBUF);
-               biodone(bio);
-       } else if (nbp->b_bcount != nbp->b_bufsize) {
-               /*
-                * A short read or write can also occur by truncating b_bcount
-                */
-#if SPEC_CHAIN_DEBUG & 1
-               kprintf("spec_strategy: chain %p short read(2) bcount %d/%d\n",
-                       bp, nbp->b_bcount + boffset, bp->b_bcount);
-#endif
-               bp->b_error = 0;
-               bp->b_bcount = nbp->b_bcount + boffset; 
-               bp->b_resid = nbp->b_resid;
-               kfree(nbp, M_DEVBUF);
-               biodone(bio);
-       } else if (nbp->b_bcount + boffset == bp->b_bcount) {
-               /*
-                * No more data terminates the chain
-                */
-#if SPEC_CHAIN_DEBUG & 1
-               kprintf("spec_strategy: chain %p finished bcount %d\n",
-                       bp, bp->b_bcount);
-#endif
-               bp->b_error = 0;
-               bp->b_resid = 0;
-               kfree(nbp, M_DEVBUF);
-               biodone(bio);
-       } else {
-               /*
-                * Continue the chain
-                */
-               boffset += nbp->b_bcount;
-               nbp->b_data = bp->b_data + boffset;
-               nbp->b_bcount = bp->b_bcount - boffset;
-               if (nbp->b_bcount > chunksize)
-                       nbp->b_bcount = chunksize;
-               nbp->b_bio1.bio_done = spec_strategy_done;
-               nbp->b_bio1.bio_offset = bio->bio_offset + boffset;
-
-#if SPEC_CHAIN_DEBUG & 1
-               kprintf("spec_strategy: chain %p offset %d/%d bcount %d\n",
-                       bp, boffset, bp->b_bcount, nbp->b_bcount);
-#endif
-
-               dev_dstrategy(nbp->b_vp->v_rdev, &nbp->b_bio1);
-       }
-}
-
-/*
- * spec_freeblks(struct vnode *a_vp, daddr_t a_addr, daddr_t a_length)
- */
-static int
-spec_freeblks(struct vop_freeblks_args *ap)
-{
-       struct buf *bp;
-
-       /*
-        * XXX: This assumes that strategy does the deed right away.
-        * XXX: this may not be TRTTD.
-        */
-       KKASSERT(ap->a_vp->v_rdev != NULL);
-       if ((dev_dflags(ap->a_vp->v_rdev) & D_CANFREE) == 0)
-               return (0);
-       bp = geteblk(ap->a_length);
-       bp->b_cmd = BUF_CMD_FREEBLKS;
-       bp->b_bio1.bio_offset = ap->a_offset;
-       bp->b_bcount = ap->a_length;
-       dev_dstrategy(ap->a_vp->v_rdev, &bp->b_bio1);
-       return (0);
-}
-
-/*
- * Implement degenerate case where the block requested is the block
- * returned, and assume that the entire device is contiguous in regards
- * to the contiguous block range (runp and runb).
- *
- * spec_bmap(struct vnode *a_vp, off_t a_loffset,
- *          off_t *a_doffsetp, int *a_runp, int *a_runb)
- */
-static int
-spec_bmap(struct vop_bmap_args *ap)
-{
-       if (ap->a_doffsetp != NULL)
-               *ap->a_doffsetp = ap->a_loffset;
-       if (ap->a_runp != NULL)
-               *ap->a_runp = MAXBSIZE;
-       if (ap->a_runb != NULL) {
-               if (ap->a_loffset < MAXBSIZE)
-                       *ap->a_runb = (int)ap->a_loffset;
-               else
-                       *ap->a_runb = MAXBSIZE;
-       }
-       return (0);
-}
-
-/*
- * Device close routine
- *
- * spec_close(struct vnode *a_vp, int a_fflag)
- *
- * NOTE: The vnode may or may not be locked on call.
- */
-/* ARGSUSED */
-static int
-spec_close(struct vop_close_args *ap)
-{
-       struct proc *p = curproc;
-       struct vnode *vp = ap->a_vp;
-       cdev_t dev = vp->v_rdev;
-       int error;
-       int needrelock;
-
-       /*
-        * A couple of hacks for devices and tty devices.  The
-        * vnode ref count cannot be used to figure out the
-        * last close, but we can use v_opencount now that
-        * revoke works properly.
-        *
-        * Detect the last close on a controlling terminal and clear
-        * the session (half-close).
-        */
-       if (dev)
-               reference_dev(dev);
-
-       if (p && vp->v_opencount <= 1 && vp == p->p_session->s_ttyvp) {
-               p->p_session->s_ttyvp = NULL;
-               vrele(vp);
-       }
-
-       /*
-        * Vnodes can be opened and closed multiple times.  Do not really
-        * close the device unless (1) it is being closed forcibly,
-        * (2) the device wants to track closes, or (3) this is the last
-        * vnode doing its last close on the device.
-        *
-        * XXX the VXLOCK (force close) case can leave vnodes referencing
-        * a closed device.  This might not occur now that our revoke is
-        * fixed.
-        */
-       if (dev && ((vp->v_flag & VRECLAIMED) ||
-           (dev_dflags(dev) & D_TRACKCLOSE) ||
-           (vp->v_opencount == 1))) {
-               needrelock = 0;
-               if (vn_islocked(vp)) {
-                       needrelock = 1;
-                       vn_unlock(vp);
-               }
-               error = dev_dclose(dev, ap->a_fflag, S_IFCHR);
-               if (needrelock)
-                       vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
-       } else {
-               error = 0;
-       }
-
-       /*
-        * Track the actual opens and closes on the vnode.  The last close
-        * disassociates the rdev.  If the rdev is already disassociated or the
-        * opencount is already 0, the vnode might have been revoked and no
-        * further opencount tracking occurs.
-        */
-       if (dev) {
-               if (dev_ref_debug) {
-                       kprintf("spec_close: %s %d\n",
-                               dev->si_name, vp->v_opencount - 1);
-               }
-               if (vp->v_opencount == 1)
-                       v_release_rdev(vp);
-               release_dev(dev);
-       }
-       if (vp->v_opencount > 0)
-               vop_stdclose(ap);
-       return(error);
-}
-
-/*
- * Print out the contents of a special device vnode.
- *
- * spec_print(struct vnode *a_vp)
- */
-static int
-spec_print(struct vop_print_args *ap)
-{
-       kprintf("tag VT_NON, dev %s\n", devtoname(ap->a_vp->v_rdev));
-       return (0);
-}
-
-/*
- * Special device advisory byte-level locks.
- *
- * spec_advlock(struct vnode *a_vp, caddr_t a_id, int a_op,
- *             struct flock *a_fl, int a_flags)
- */
-/* ARGSUSED */
-static int
-spec_advlock(struct vop_advlock_args *ap)
-{
-       return ((ap->a_flags & F_POSIX) ? EINVAL : EOPNOTSUPP);
-}
-
-/*
- * spec_getpages() - get pages associated with device vnode.
- *
- * Note that spec_read and spec_write do not use the buffer cache, so we
- * must fully implement getpages here.
- */
-static int
-spec_getpages(struct vop_getpages_args *ap)
-{
-       vm_offset_t kva;
-       int error;
-       int i, pcount, size;
-       struct buf *bp;
-       vm_page_t m;
-       vm_ooffset_t offset;
-       int toff, nextoff, nread;
-       struct vnode *vp = ap->a_vp;
-       int blksiz;
-       int gotreqpage;
-
-       error = 0;
-       pcount = round_page(ap->a_count) / PAGE_SIZE;
-
-       /*
-        * Calculate the offset of the transfer and do sanity check.
-        */
-       offset = IDX_TO_OFF(ap->a_m[0]->pindex) + ap->a_offset;
-
-       /*
-        * Round up physical size for real devices.  We cannot round using
-        * v_mount's block size data because v_mount has nothing to do with
-        * the device.  i.e. it's usually '/dev'.  We need the physical block
-        * size for the device itself.
-        *
-        * We can't use v_rdev->si_mountpoint because it only exists when the
-        * block device is mounted.  However, we can use v_rdev.
-        */
-
-       if (vn_isdisk(vp, NULL))
-               blksiz = vp->v_rdev->si_bsize_phys;
-       else
-               blksiz = DEV_BSIZE;
-
-       size = (ap->a_count + blksiz - 1) & ~(blksiz - 1);
-
-       bp = getpbuf(NULL);
-       kva = (vm_offset_t)bp->b_data;
-
-       /*
-        * Map the pages to be read into the kva.
-        */
-       pmap_qenter(kva, ap->a_m, pcount);
-
-       /* Build a minimal buffer header. */
-       bp->b_cmd = BUF_CMD_READ;
-       bp->b_bcount = size;
-       bp->b_resid = 0;
-       bp->b_runningbufspace = size;
-       if (size) {
-               runningbufspace += bp->b_runningbufspace;
-               ++runningbufcount;
-       }
-
-       bp->b_bio1.bio_offset = offset;
-       bp->b_bio1.bio_done = biodone_sync;
-       bp->b_bio1.bio_flags |= BIO_SYNC;
-
-       mycpu->gd_cnt.v_vnodein++;
-       mycpu->gd_cnt.v_vnodepgsin += pcount;
-
-       /* Do the input. */
-       vn_strategy(ap->a_vp, &bp->b_bio1);
-       biowait(&bp->b_bio1, "spread");
-
-       if (bp->b_flags & B_ERROR) {
-               if (bp->b_error)
-                       error = bp->b_error;
-               else
-                       error = EIO;
-       }
-
-       /*
-        * If EOF is encountered we must zero-extend the result in order
-        * to ensure that the page does not contain garabge.  When no
-        * error occurs, an early EOF is indicated if b_bcount got truncated.
-        * b_resid is relative to b_bcount and should be 0, but some devices
-        * might indicate an EOF with b_resid instead of truncating b_bcount.
-        */
-       nread = bp->b_bcount - bp->b_resid;
-       if (nread < ap->a_count)
-               bzero((caddr_t)kva + nread, ap->a_count - nread);
-       pmap_qremove(kva, pcount);
-
-       gotreqpage = 0;
-       for (i = 0, toff = 0; i < pcount; i++, toff = nextoff) {
-               nextoff = toff + PAGE_SIZE;
-               m = ap->a_m[i];
-
-               m->flags &= ~PG_ZERO;
-
-               if (nextoff <= nread) {
-                       m->valid = VM_PAGE_BITS_ALL;
-                       vm_page_undirty(m);
-               } else if (toff < nread) {
-                       /*
-                        * Since this is a VM request, we have to supply the
-                        * unaligned offset to allow vm_page_set_validclean()
-                        * to zero sub-DEV_BSIZE'd portions of the page.
-                        */
-                       vm_page_set_validclean(m, 0, nread - toff);
-               } else {
-                       m->valid = 0;
-                       vm_page_undirty(m);
-               }
-
-               if (i != ap->a_reqpage) {
-                       /*
-                        * Just in case someone was asking for this page we
-                        * now tell them that it is ok to use.
-                        */
-                       if (!error || (m->valid == VM_PAGE_BITS_ALL)) {
-                               if (m->valid) {
-                                       if (m->flags & PG_WANTED) {
-                                               vm_page_activate(m);
-                                       } else {
-                                               vm_page_deactivate(m);
-                                       }
-                                       vm_page_wakeup(m);
-                               } else {
-                                       vm_page_free(m);
-                               }
-                       } else {
-                               vm_page_free(m);
-                       }
-               } else if (m->valid) {
-                       gotreqpage = 1;
-                       /*
-                        * Since this is a VM request, we need to make the
-                        * entire page presentable by zeroing invalid sections.
-                        */
-                       if (m->valid != VM_PAGE_BITS_ALL)
-                           vm_page_zero_invalid(m, FALSE);
-               }
-       }
-       if (!gotreqpage) {
-               m = ap->a_m[ap->a_reqpage];
-               kprintf(
-           "spec_getpages:(%s) I/O read failure: (error=%d) bp %p vp %p\n",
-                       devtoname(vp->v_rdev), error, bp, bp->b_vp);
-               kprintf(
-           "               size: %d, resid: %d, a_count: %d, valid: 0x%x\n",
-                   size, bp->b_resid, ap->a_count, m->valid);
-               kprintf(
-           "               nread: %d, reqpage: %d, pindex: %lu, pcount: %d\n",
-                   nread, ap->a_reqpage, (u_long)m->pindex, pcount);
-               /*
-                * Free the buffer header back to the swap buffer pool.
-                */
-               relpbuf(bp, NULL);
-               return VM_PAGER_ERROR;
-       }
-       /*
-        * Free the buffer header back to the swap buffer pool.
-        */
-       relpbuf(bp, NULL);
-       return VM_PAGER_OK;
-}