diff options
Diffstat (limited to 'sys/miscfs/specfs/spec_vnops.c')
| -rw-r--r-- | sys/miscfs/specfs/spec_vnops.c | 838 |
1 files changed, 0 insertions, 838 deletions
diff --git a/sys/miscfs/specfs/spec_vnops.c b/sys/miscfs/specfs/spec_vnops.c deleted file mode 100644 index ba81229..0000000 --- a/sys/miscfs/specfs/spec_vnops.c +++ /dev/null @@ -1,838 +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 - * $FreeBSD$ - */ - -#include <sys/param.h> -#include <sys/proc.h> -#include <sys/systm.h> -#include <sys/kernel.h> -#include <sys/conf.h> -#include <sys/bio.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_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_kqfilter __P((struct vop_kqfilter_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_getwritemount_desc, (vop_t *) vop_stdgetwritemount }, - { &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_kqfilter_desc, (vop_t *) spec_kqfilter }, - { &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; - - if (vp->v_type == VBLK) - return ENXIO; - /* - * 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, 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->si_mountpoint != NULL && - !(vp->v_rdev->si_mountpoint->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 && vfs_mountedon(vp)) - 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, NULL)) { - 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, resid; - - vp = ap->a_vp; - dev = vp->v_rdev; - uio = ap->a_uio; - p = uio->uio_procp; - resid = uio->uio_resid; - - if (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); - if (uio->uio_resid != resid || (error == 0 && resid != 0)) - getnanotime(&dev->si_atime); - 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, resid; - - vp = ap->a_vp; - dev = vp->v_rdev; - uio = ap->a_uio; - p = uio->uio_procp; - resid = uio->uio_resid; - - VOP_UNLOCK(vp, 0, p); - error = (*devsw(dev)->d_write) (dev, uio, ap->a_ioflag); - vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); - if (uio->uio_resid != resid || (error == 0 && resid != 0)) { - getnanotime(&dev->si_ctime); - dev->si_mtime = dev->si_ctime; - } - 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); -} - -/* ARGSUSED */ -static int -spec_kqfilter(ap) - struct vop_kqfilter_args /* { - struct vnode *a_vp; - struct knote *a_kn; - } */ *ap; -{ - dev_t dev; - - dev = ap->a_vp->v_rdev; - if (devsw(dev)->d_flags & D_KQFILTER) - return (*devsw(dev)->d_kqfilter)(dev, ap->a_kn); - return (1); -} - -/* - * 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; - int maxretry = 10000; /* large, arbitrarily chosen */ - - if (!vn_isdisk(vp, NULL)) - return (0); - -loop1: - /* - * MARK/SCAN initialization to avoid infinite loops - */ - s = splbio(); - TAILQ_FOREACH(bp, &vp->v_dirtyblkhd, b_vnbufs) { - bp->b_flags &= ~B_SCANNED; - } - splx(s); - - /* - * Flush all dirty buffers associated with a block device. - */ -loop2: - s = splbio(); - for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { - nbp = TAILQ_NEXT(bp, b_vnbufs); - if ((bp->b_flags & B_SCANNED) != 0) - continue; - bp->b_flags |= B_SCANNED; - 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 loop2; - } - - /* - * If synchronous the caller expects us to completely resolve all - * dirty buffers in the system. Wait for in-progress I/O to - * complete (which could include background bitmap writes), then - * retry if dirty blocks still exist. - */ - 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); - } - if (!TAILQ_EMPTY(&vp->v_dirtyblkhd)) { - if (--maxretry != 0) { - splx(s); - goto loop1; - } - vprint("spec_fsync: giving up on dirty", vp); - } - } - splx(s); - 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; - int error; - - bp = ap->a_bp; - vp = ap->a_vp; - if ((bp->b_iocmd == BIO_WRITE)) { - if ((bp->b_flags & B_VALIDSUSPWRT) == 0 && - bp->b_vp != NULL && bp->b_vp->v_mount != NULL && - (bp->b_vp->v_mount->mnt_kern_flag & MNTK_SUSPENDED) != 0) - panic("spec_strategy: bad I/O"); - bp->b_flags &= ~B_VALIDSUSPWRT; - if (LIST_FIRST(&bp->b_dep) != NULL) - buf_start(bp); - if ((vp->v_flag & VCOPYONWRITE) && vp->v_rdev->si_copyonwrite && - (error = (*vp->v_rdev->si_copyonwrite)(vp, bp)) != 0 && - error != EOPNOTSUPP) { - bp->b_io.bio_error = error; - bp->b_io.bio_flags |= BIO_ERROR; - biodone(&bp->b_io); - return (0); - } - } - /* - * Collect statistics on synchronous and asynchronous read - * and write counts for disks that have associated filesystems. - */ - if (vn_isdisk(vp, NULL) && (mp = vp->v_rdev->si_mountpoint) != NULL) { - if (bp->b_iocmd == BIO_WRITE) { - 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)); - DEV_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_iocmd = BIO_DELETE; - 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_KERNPROC(bp); - DEV_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_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_iocmd = BIO_READ; - 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; - bp->b_runningbufspace = bp->b_bufsize; - runningbufspace += bp->b_runningbufspace; - - cnt.v_vnodein++; - cnt.v_vnodepgsin += pcount; - - mtx_unlock(&vm_mtx); - mtx_lock(&Giant); - /* Do the input. */ - BUF_STRATEGY(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); - mtx_unlock(&Giant); - mtx_lock(&vm_mtx); - - if ((bp->b_ioflags & BIO_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]; - 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); - /* - * 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; -} |
