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-rw-r--r--sys/fs/specfs/spec_vnops.c780
1 files changed, 780 insertions, 0 deletions
diff --git a/sys/fs/specfs/spec_vnops.c b/sys/fs/specfs/spec_vnops.c
new file mode 100644
index 0000000..4f8488e
--- /dev/null
+++ b/sys/fs/specfs/spec_vnops.c
@@ -0,0 +1,780 @@
+/*
+ * 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
+ * $FreeBSD$
+ */
+
+#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/mount.h>
+#include <sys/vnode.h>
+#include <sys/stat.h>
+#include <sys/fcntl.h>
+#include <sys/vmmeter.h>
+#include <sys/tty.h>
+
+#include <vm/vm.h>
+#include <vm/vm_object.h>
+#include <vm/vm_page.h>
+#include <vm/vm_pager.h>
+
+static int spec_advlock __P((struct vop_advlock_args *));
+static int spec_bmap __P((struct vop_bmap_args *));
+static int spec_close __P((struct vop_close_args *));
+static int spec_freeblks __P((struct vop_freeblks_args *));
+static int spec_fsync __P((struct vop_fsync_args *));
+static int spec_getpages __P((struct vop_getpages_args *));
+static int spec_inactive __P((struct vop_inactive_args *));
+static int spec_ioctl __P((struct vop_ioctl_args *));
+static int spec_open __P((struct vop_open_args *));
+static int spec_poll __P((struct vop_poll_args *));
+static int spec_print __P((struct vop_print_args *));
+static int spec_read __P((struct vop_read_args *));
+static int spec_strategy __P((struct vop_strategy_args *));
+static int spec_write __P((struct vop_write_args *));
+
+vop_t **spec_vnodeop_p;
+static struct vnodeopv_entry_desc spec_vnodeop_entries[] = {
+ { &vop_default_desc, (vop_t *) vop_defaultop },
+ { &vop_access_desc, (vop_t *) vop_ebadf },
+ { &vop_advlock_desc, (vop_t *) spec_advlock },
+ { &vop_bmap_desc, (vop_t *) spec_bmap },
+ { &vop_close_desc, (vop_t *) spec_close },
+ { &vop_create_desc, (vop_t *) vop_panic },
+ { &vop_freeblks_desc, (vop_t *) spec_freeblks },
+ { &vop_fsync_desc, (vop_t *) spec_fsync },
+ { &vop_getpages_desc, (vop_t *) spec_getpages },
+ { &vop_inactive_desc, (vop_t *) spec_inactive },
+ { &vop_ioctl_desc, (vop_t *) spec_ioctl },
+ { &vop_lease_desc, (vop_t *) vop_null },
+ { &vop_link_desc, (vop_t *) vop_panic },
+ { &vop_mkdir_desc, (vop_t *) vop_panic },
+ { &vop_mknod_desc, (vop_t *) vop_panic },
+ { &vop_open_desc, (vop_t *) spec_open },
+ { &vop_pathconf_desc, (vop_t *) vop_stdpathconf },
+ { &vop_poll_desc, (vop_t *) spec_poll },
+ { &vop_print_desc, (vop_t *) spec_print },
+ { &vop_read_desc, (vop_t *) spec_read },
+ { &vop_readdir_desc, (vop_t *) vop_panic },
+ { &vop_readlink_desc, (vop_t *) vop_panic },
+ { &vop_reallocblks_desc, (vop_t *) vop_panic },
+ { &vop_reclaim_desc, (vop_t *) vop_null },
+ { &vop_remove_desc, (vop_t *) vop_panic },
+ { &vop_rename_desc, (vop_t *) vop_panic },
+ { &vop_rmdir_desc, (vop_t *) vop_panic },
+ { &vop_setattr_desc, (vop_t *) vop_ebadf },
+ { &vop_strategy_desc, (vop_t *) spec_strategy },
+ { &vop_symlink_desc, (vop_t *) vop_panic },
+ { &vop_write_desc, (vop_t *) spec_write },
+ { NULL, NULL }
+};
+static struct vnodeopv_desc spec_vnodeop_opv_desc =
+ { &spec_vnodeop_p, spec_vnodeop_entries };
+
+VNODEOP_SET(spec_vnodeop_opv_desc);
+
+int
+spec_vnoperate(ap)
+ struct vop_generic_args /* {
+ struct vnodeop_desc *a_desc;
+ <other random data follows, presumably>
+ } */ *ap;
+{
+ return (VOCALL(spec_vnodeop_p, ap->a_desc->vdesc_offset, ap));
+}
+
+static void spec_getpages_iodone __P((struct buf *bp));
+
+/*
+ * Open a special file.
+ */
+/* ARGSUSED */
+static int
+spec_open(ap)
+ struct vop_open_args /* {
+ struct vnode *a_vp;
+ int a_mode;
+ struct ucred *a_cred;
+ struct proc *a_p;
+ } */ *ap;
+{
+ struct proc *p = ap->a_p;
+ struct vnode *vp = ap->a_vp;
+ dev_t dev = vp->v_rdev;
+ int error;
+ struct cdevsw *dsw;
+ 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);
+
+ dsw = devsw(dev);
+ if ( (dsw == NULL) || (dsw->d_open == NULL))
+ return ENXIO;
+
+ /* Make this field valid before any I/O 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) && ap->a_cred != FSCRED && (ap->a_mode & FWRITE)) {
+ /*
+ * Never allow opens for write if the device is mounted R/W
+ */
+ if (vp->v_specmountpoint != NULL &&
+ !(vp->v_specmountpoint->mnt_flag & MNT_RDONLY))
+ return (EBUSY);
+
+ /*
+ * When running in secure mode, do not allow opens
+ * for writing if the device is mounted
+ */
+ if (securelevel >= 1 && vp->v_specmountpoint != NULL)
+ return (EPERM);
+
+ /*
+ * When running in very secure mode, do not allow
+ * opens for writing of any devices.
+ */
+ if (securelevel >= 2)
+ return (EPERM);
+ }
+
+ /* XXX: Special casing of ttys for deadfs. Probably redundant */
+ if (dsw->d_flags & D_TTY)
+ vp->v_flag |= VISTTY;
+
+ VOP_UNLOCK(vp, 0, p);
+ error = (*dsw->d_open)(dev, ap->a_mode, S_IFCHR, p);
+ vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
+
+ if (error)
+ return (error);
+
+ if (dsw->d_flags & D_TTY) {
+ if (dev->si_tty) {
+ struct tty *tp;
+ tp = dev->si_tty;
+ if (!tp->t_stop) {
+ printf("Warning:%s: no t_stop, using nottystop\n", devtoname(dev));
+ tp->t_stop = nottystop;
+ }
+ }
+ }
+
+ if (vn_isdisk(vp)) {
+ if (!dev->si_bsize_phys)
+ dev->si_bsize_phys = DEV_BSIZE;
+ }
+ if ((dsw->d_flags & D_DISK) == 0) {
+ cp = devtoname(dev);
+ if (*cp == '#' && (dsw->d_flags & D_NAGGED) == 0) {
+ printf("WARNING: driver %s should register devices with make_dev() (dev_t = \"%s\")\n",
+ dsw->d_name, cp);
+ dsw->d_flags |= D_NAGGED;
+ }
+ }
+ return (error);
+}
+
+/*
+ * Vnode op for read
+ */
+/* ARGSUSED */
+static int
+spec_read(ap)
+ struct vop_read_args /* {
+ struct vnode *a_vp;
+ struct uio *a_uio;
+ int a_ioflag;
+ struct ucred *a_cred;
+ } */ *ap;
+{
+ struct vnode *vp;
+ struct proc *p;
+ struct uio *uio;
+ dev_t dev;
+ int error;
+
+ vp = ap->a_vp;
+ dev = vp->v_rdev;
+ uio = ap->a_uio;
+ p = uio->uio_procp;
+
+ if (uio->uio_resid == 0)
+ return (0);
+
+ VOP_UNLOCK(vp, 0, p);
+ error = (*devsw(dev)->d_read) (dev, uio, ap->a_ioflag);
+ vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
+ return (error);
+}
+
+/*
+ * Vnode op for write
+ */
+/* ARGSUSED */
+static int
+spec_write(ap)
+ struct vop_write_args /* {
+ struct vnode *a_vp;
+ struct uio *a_uio;
+ int a_ioflag;
+ struct ucred *a_cred;
+ } */ *ap;
+{
+ struct vnode *vp;
+ struct proc *p;
+ struct uio *uio;
+ dev_t dev;
+ int error;
+
+ vp = ap->a_vp;
+ dev = vp->v_rdev;
+ uio = ap->a_uio;
+ p = uio->uio_procp;
+
+ VOP_UNLOCK(vp, 0, p);
+ error = (*devsw(dev)->d_write) (dev, uio, ap->a_ioflag);
+ vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
+ return (error);
+}
+
+/*
+ * Device ioctl operation.
+ */
+/* ARGSUSED */
+static int
+spec_ioctl(ap)
+ struct vop_ioctl_args /* {
+ struct vnode *a_vp;
+ int a_command;
+ caddr_t a_data;
+ int a_fflag;
+ struct ucred *a_cred;
+ struct proc *a_p;
+ } */ *ap;
+{
+ dev_t dev;
+
+ dev = ap->a_vp->v_rdev;
+ return ((*devsw(dev)->d_ioctl)(dev, ap->a_command,
+ ap->a_data, ap->a_fflag, ap->a_p));
+}
+
+/* ARGSUSED */
+static int
+spec_poll(ap)
+ struct vop_poll_args /* {
+ struct vnode *a_vp;
+ int a_events;
+ struct ucred *a_cred;
+ struct proc *a_p;
+ } */ *ap;
+{
+ dev_t dev;
+
+ dev = ap->a_vp->v_rdev;
+ return (*devsw(dev)->d_poll)(dev, ap->a_events, ap->a_p);
+}
+/*
+ * Synch buffers associated with a block device
+ */
+/* ARGSUSED */
+static int
+spec_fsync(ap)
+ struct vop_fsync_args /* {
+ struct vnode *a_vp;
+ struct ucred *a_cred;
+ int a_waitfor;
+ struct proc *a_p;
+ } */ *ap;
+{
+ struct vnode *vp = ap->a_vp;
+ struct buf *bp;
+ struct buf *nbp;
+ int s;
+
+ if (!vn_isdisk(vp))
+ return (0);
+
+ /*
+ * Flush all dirty buffers associated with a block device.
+ */
+loop:
+ s = splbio();
+ for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) {
+ nbp = TAILQ_NEXT(bp, b_vnbufs);
+ if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT))
+ continue;
+ if ((bp->b_flags & B_DELWRI) == 0)
+ panic("spec_fsync: not dirty");
+ if ((vp->v_flag & VOBJBUF) && (bp->b_flags & B_CLUSTEROK)) {
+ BUF_UNLOCK(bp);
+ vfs_bio_awrite(bp);
+ splx(s);
+ } else {
+ bremfree(bp);
+ splx(s);
+ bawrite(bp);
+ }
+ goto loop;
+ }
+ if (ap->a_waitfor == MNT_WAIT) {
+ while (vp->v_numoutput) {
+ vp->v_flag |= VBWAIT;
+ (void) tsleep((caddr_t)&vp->v_numoutput, PRIBIO + 1, "spfsyn", 0);
+ }
+#ifdef DIAGNOSTIC
+ if (!TAILQ_EMPTY(&vp->v_dirtyblkhd)) {
+ vprint("spec_fsync: dirty", vp);
+ splx(s);
+ goto loop;
+ }
+#endif
+ }
+ splx(s);
+ return (0);
+}
+
+static int
+spec_inactive(ap)
+ struct vop_inactive_args /* {
+ struct vnode *a_vp;
+ struct proc *a_p;
+ } */ *ap;
+{
+
+ VOP_UNLOCK(ap->a_vp, 0, ap->a_p);
+ return (0);
+}
+
+/*
+ * Just call the device strategy routine
+ */
+static int
+spec_strategy(ap)
+ struct vop_strategy_args /* {
+ struct vnode *a_vp;
+ struct buf *a_bp;
+ } */ *ap;
+{
+ struct buf *bp;
+ struct vnode *vp;
+ struct mount *mp;
+
+ bp = ap->a_bp;
+ if (((bp->b_flags & B_READ) == 0) &&
+ (LIST_FIRST(&bp->b_dep)) != NULL && bioops.io_start)
+ (*bioops.io_start)(bp);
+
+ /*
+ * Collect statistics on synchronous and asynchronous read
+ * and write counts for disks that have associated filesystems.
+ */
+ vp = ap->a_vp;
+ if (vn_isdisk(vp) && (mp = vp->v_specmountpoint) != NULL) {
+ if ((bp->b_flags & B_READ) == 0) {
+ if (bp->b_lock.lk_lockholder == LK_KERNPROC)
+ mp->mnt_stat.f_asyncwrites++;
+ else
+ mp->mnt_stat.f_syncwrites++;
+ } else {
+ if (bp->b_lock.lk_lockholder == LK_KERNPROC)
+ mp->mnt_stat.f_asyncreads++;
+ else
+ mp->mnt_stat.f_syncreads++;
+ }
+ }
+ KASSERT(devsw(bp->b_dev) != NULL,
+ ("No devsw on dev %s responsible for buffer %p\n",
+ devtoname(bp->b_dev), bp));
+ KASSERT(devsw(bp->b_dev)->d_strategy != NULL,
+ ("No strategy on dev %s responsible for buffer %p\n",
+ devtoname(bp->b_dev), bp));
+ BUF_STRATEGY(bp, 0);
+ return (0);
+}
+
+static int
+spec_freeblks(ap)
+ struct vop_freeblks_args /* {
+ struct vnode *a_vp;
+ daddr_t a_addr;
+ daddr_t a_length;
+ } */ *ap;
+{
+ struct cdevsw *bsw;
+ struct buf *bp;
+
+ /*
+ * XXX: This assumes that strategy does the deed right away.
+ * XXX: this may not be TRTTD.
+ */
+ bsw = devsw(ap->a_vp->v_rdev);
+ if ((bsw->d_flags & D_CANFREE) == 0)
+ return (0);
+ bp = geteblk(ap->a_length);
+ bp->b_flags |= B_FREEBUF;
+ bp->b_dev = ap->a_vp->v_rdev;
+ bp->b_blkno = ap->a_addr;
+ bp->b_offset = dbtob(ap->a_addr);
+ bp->b_bcount = ap->a_length;
+ BUF_STRATEGY(bp, 0);
+ 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).
+ */
+static int
+spec_bmap(ap)
+ struct vop_bmap_args /* {
+ struct vnode *a_vp;
+ daddr_t a_bn;
+ struct vnode **a_vpp;
+ daddr_t *a_bnp;
+ int *a_runp;
+ int *a_runb;
+ } */ *ap;
+{
+ struct vnode *vp = ap->a_vp;
+ int runp = 0;
+ int runb = 0;
+
+ if (ap->a_vpp != NULL)
+ *ap->a_vpp = vp;
+ if (ap->a_bnp != NULL)
+ *ap->a_bnp = ap->a_bn;
+ if (vp->v_mount != NULL)
+ runp = runb = MAXBSIZE / vp->v_mount->mnt_stat.f_iosize;
+ if (ap->a_runp != NULL)
+ *ap->a_runp = runp;
+ if (ap->a_runb != NULL)
+ *ap->a_runb = runb;
+ return (0);
+}
+
+/*
+ * Device close routine
+ */
+/* ARGSUSED */
+static int
+spec_close(ap)
+ struct vop_close_args /* {
+ struct vnode *a_vp;
+ int a_fflag;
+ struct ucred *a_cred;
+ struct proc *a_p;
+ } */ *ap;
+{
+ struct vnode *vp = ap->a_vp;
+ struct proc *p = ap->a_p;
+ dev_t dev = vp->v_rdev;
+
+ /*
+ * Hack: a tty device that is a controlling terminal
+ * has a reference from the session structure.
+ * We cannot easily tell that a character device is
+ * a controlling terminal, unless it is the closing
+ * process' controlling terminal. In that case,
+ * if the reference count is 2 (this last descriptor
+ * plus the session), release the reference from the session.
+ */
+ if (vcount(vp) == 2 && p && (vp->v_flag & VXLOCK) == 0 &&
+ vp == p->p_session->s_ttyvp) {
+ vrele(vp);
+ p->p_session->s_ttyvp = NULL;
+ }
+ /*
+ * We do not want to really close the device if it
+ * is still in use unless we are trying to close it
+ * forcibly. Since every use (buffer, vnode, swap, cmap)
+ * holds a reference to the vnode, and because we mark
+ * any other vnodes that alias this device, when the
+ * sum of the reference counts on all the aliased
+ * vnodes descends to one, we are on last close.
+ */
+ if (vp->v_flag & VXLOCK) {
+ /* Forced close */
+ } else if (devsw(dev)->d_flags & D_TRACKCLOSE) {
+ /* Keep device updated on status */
+ } else if (vcount(vp) > 1) {
+ return (0);
+ }
+ return (devsw(dev)->d_close(dev, ap->a_fflag, S_IFCHR, p));
+}
+
+/*
+ * Print out the contents of a special device vnode.
+ */
+static int
+spec_print(ap)
+ struct vop_print_args /* {
+ struct vnode *a_vp;
+ } */ *ap;
+{
+
+ printf("tag VT_NON, dev %s\n", devtoname(ap->a_vp->v_rdev));
+ return (0);
+}
+
+/*
+ * Special device advisory byte-level locks.
+ */
+/* ARGSUSED */
+static int
+spec_advlock(ap)
+ struct vop_advlock_args /* {
+ struct vnode *a_vp;
+ caddr_t a_id;
+ int a_op;
+ struct flock *a_fl;
+ int a_flags;
+ } */ *ap;
+{
+
+ return (ap->a_flags & F_FLOCK ? EOPNOTSUPP : EINVAL);
+}
+
+static void
+spec_getpages_iodone(bp)
+ struct buf *bp;
+{
+
+ bp->b_flags |= B_DONE;
+ wakeup(bp);
+}
+
+static int
+spec_getpages(ap)
+ struct vop_getpages_args *ap;
+{
+ vm_offset_t kva;
+ int error;
+ int i, pcount, size, s;
+ daddr_t blkno;
+ 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.
+ * FreeBSD currently only supports an 8 TB range due to b_blkno
+ * being in DEV_BSIZE ( usually 512 ) byte chunks on call to
+ * VOP_STRATEGY. XXX
+ */
+ offset = IDX_TO_OFF(ap->a_m[0]->pindex) + ap->a_offset;
+
+#define DADDR_T_BIT (sizeof(daddr_t)*8)
+#define OFFSET_MAX ((1LL << (DADDR_T_BIT + DEV_BSHIFT)) - 1)
+
+ if (offset < 0 || offset > OFFSET_MAX) {
+ /* XXX still no %q in kernel. */
+ printf("spec_getpages: preposterous offset 0x%x%08x\n",
+ (u_int)((u_quad_t)offset >> 32),
+ (u_int)(offset & 0xffffffff));
+ return (VM_PAGER_ERROR);
+ }
+
+ blkno = btodb(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_specmountpoint because it only exists when the
+ * block device is mounted. However, we can use v_rdev.
+ */
+
+ if (vn_isdisk(vp))
+ 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_flags = B_READ | B_CALL;
+ bp->b_iodone = spec_getpages_iodone;
+
+ /* B_PHYS is not set, but it is nice to fill this in. */
+ bp->b_rcred = bp->b_wcred = curproc->p_ucred;
+ if (bp->b_rcred != NOCRED)
+ crhold(bp->b_rcred);
+ if (bp->b_wcred != NOCRED)
+ crhold(bp->b_wcred);
+ bp->b_blkno = blkno;
+ bp->b_lblkno = blkno;
+ pbgetvp(ap->a_vp, bp);
+ bp->b_bcount = size;
+ bp->b_bufsize = size;
+ bp->b_resid = 0;
+
+ cnt.v_vnodein++;
+ cnt.v_vnodepgsin += pcount;
+
+ /* Do the input. */
+ VOP_STRATEGY(bp->b_vp, bp);
+
+ s = splbio();
+
+ /* We definitely need to be at splbio here. */
+ while ((bp->b_flags & B_DONE) == 0)
+ tsleep(bp, PVM, "spread", 0);
+
+ splx(s);
+
+ if ((bp->b_flags & B_ERROR) != 0) {
+ if (bp->b_error)
+ error = bp->b_error;
+ else
+ error = EIO;
+ }
+
+ nread = size - 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];
+#ifndef MAX_PERF
+ printf(
+ "spec_getpages:(%s) I/O read failure: (error=%d) bp %p vp %p\n",
+ devtoname(bp->b_dev), error, bp, bp->b_vp);
+ printf(
+ " size: %d, resid: %ld, a_count: %d, valid: 0x%x\n",
+ size, bp->b_resid, ap->a_count, m->valid);
+ printf(
+ " nread: %d, reqpage: %d, pindex: %lu, pcount: %d\n",
+ nread, ap->a_reqpage, (u_long)m->pindex, pcount);
+#endif
+ /*
+ * 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;
+}
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