26facaeb4d
are probably talking about some disk-device which wente away, so return ENXIO instead of panicing.
850 lines
21 KiB
C
850 lines
21 KiB
C
/*
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* Copyright (c) 1989, 1993, 1995
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)spec_vnops.c 8.14 (Berkeley) 5/21/95
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/lock.h>
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#include <sys/sx.h>
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#include <sys/proc.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/conf.h>
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#include <sys/bio.h>
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#include <sys/buf.h>
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#include <sys/mount.h>
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#include <sys/vnode.h>
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#include <sys/stat.h>
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#include <sys/fcntl.h>
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#include <sys/vmmeter.h>
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#include <sys/tty.h>
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#include <vm/vm.h>
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#include <vm/vm_object.h>
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#include <vm/vm_page.h>
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#include <vm/vm_pager.h>
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static int spec_advlock __P((struct vop_advlock_args *));
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static int spec_bmap __P((struct vop_bmap_args *));
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static int spec_close __P((struct vop_close_args *));
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static int spec_freeblks __P((struct vop_freeblks_args *));
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static int spec_fsync __P((struct vop_fsync_args *));
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static int spec_getpages __P((struct vop_getpages_args *));
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static int spec_ioctl __P((struct vop_ioctl_args *));
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static int spec_kqfilter __P((struct vop_kqfilter_args *));
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static int spec_open __P((struct vop_open_args *));
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static int spec_poll __P((struct vop_poll_args *));
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static int spec_print __P((struct vop_print_args *));
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static int spec_read __P((struct vop_read_args *));
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static int spec_strategy __P((struct vop_strategy_args *));
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static int spec_write __P((struct vop_write_args *));
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vop_t **spec_vnodeop_p;
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static struct vnodeopv_entry_desc spec_vnodeop_entries[] = {
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{ &vop_default_desc, (vop_t *) vop_defaultop },
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{ &vop_access_desc, (vop_t *) vop_ebadf },
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{ &vop_advlock_desc, (vop_t *) spec_advlock },
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{ &vop_bmap_desc, (vop_t *) spec_bmap },
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{ &vop_close_desc, (vop_t *) spec_close },
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{ &vop_create_desc, (vop_t *) vop_panic },
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{ &vop_freeblks_desc, (vop_t *) spec_freeblks },
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{ &vop_fsync_desc, (vop_t *) spec_fsync },
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{ &vop_getpages_desc, (vop_t *) spec_getpages },
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{ &vop_getwritemount_desc, (vop_t *) vop_stdgetwritemount },
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{ &vop_ioctl_desc, (vop_t *) spec_ioctl },
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{ &vop_kqfilter_desc, (vop_t *) spec_kqfilter },
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{ &vop_lease_desc, (vop_t *) vop_null },
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{ &vop_link_desc, (vop_t *) vop_panic },
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{ &vop_mkdir_desc, (vop_t *) vop_panic },
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{ &vop_mknod_desc, (vop_t *) vop_panic },
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{ &vop_open_desc, (vop_t *) spec_open },
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{ &vop_pathconf_desc, (vop_t *) vop_stdpathconf },
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{ &vop_poll_desc, (vop_t *) spec_poll },
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{ &vop_print_desc, (vop_t *) spec_print },
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{ &vop_read_desc, (vop_t *) spec_read },
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{ &vop_readdir_desc, (vop_t *) vop_panic },
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{ &vop_readlink_desc, (vop_t *) vop_panic },
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{ &vop_reallocblks_desc, (vop_t *) vop_panic },
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{ &vop_reclaim_desc, (vop_t *) vop_null },
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{ &vop_remove_desc, (vop_t *) vop_panic },
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{ &vop_rename_desc, (vop_t *) vop_panic },
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{ &vop_rmdir_desc, (vop_t *) vop_panic },
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{ &vop_setattr_desc, (vop_t *) vop_ebadf },
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{ &vop_strategy_desc, (vop_t *) spec_strategy },
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{ &vop_symlink_desc, (vop_t *) vop_panic },
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{ &vop_write_desc, (vop_t *) spec_write },
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{ NULL, NULL }
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};
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static struct vnodeopv_desc spec_vnodeop_opv_desc =
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{ &spec_vnodeop_p, spec_vnodeop_entries };
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VNODEOP_SET(spec_vnodeop_opv_desc);
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int
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spec_vnoperate(ap)
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struct vop_generic_args /* {
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struct vnodeop_desc *a_desc;
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<other random data follows, presumably>
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} */ *ap;
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{
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return (VOCALL(spec_vnodeop_p, ap->a_desc->vdesc_offset, ap));
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}
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static void spec_getpages_iodone __P((struct buf *bp));
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/*
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* Open a special file.
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*/
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/* ARGSUSED */
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static int
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spec_open(ap)
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struct vop_open_args /* {
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struct vnode *a_vp;
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int a_mode;
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struct ucred *a_cred;
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struct thread *a_td;
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} */ *ap;
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{
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struct thread *td = ap->a_td;
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struct vnode *vp = ap->a_vp;
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dev_t dev = vp->v_rdev;
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int error;
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struct cdevsw *dsw;
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const char *cp;
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if (vp->v_type == VBLK)
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return (ENXIO);
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/* Don't allow open if fs is mounted -nodev. */
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if (vp->v_mount && (vp->v_mount->mnt_flag & MNT_NODEV))
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return (ENXIO);
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dsw = devsw(dev);
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if (dsw == NULL || dsw->d_open == NULL)
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return (ENXIO);
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/* Make this field valid before any I/O in d_open. */
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if (dev->si_iosize_max == 0)
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dev->si_iosize_max = DFLTPHYS;
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/*
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* XXX: Disks get special billing here, but it is mostly wrong.
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* XXX: Disk partitions can overlap and the real checks should
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* XXX: take this into account, and consequently they need to
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* XXX: live in the disk slice code. Some checks do.
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*/
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if (vn_isdisk(vp, NULL) && ap->a_cred != FSCRED &&
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(ap->a_mode & FWRITE)) {
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/*
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* Never allow opens for write if the disk is mounted R/W.
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*/
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if (vp->v_rdev->si_mountpoint != NULL &&
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!(vp->v_rdev->si_mountpoint->mnt_flag & MNT_RDONLY))
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return (EBUSY);
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/*
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* When running in secure mode, do not allow opens
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* for writing if the disk is mounted.
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*/
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error = securelevel_ge(td->td_ucred, 1);
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if (error && vfs_mountedon(vp))
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return (error);
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/*
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* When running in very secure mode, do not allow
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* opens for writing of any disks.
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*/
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error = securelevel_ge(td->td_ucred, 2);
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if (error)
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return (error);
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}
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/* XXX: Special casing of ttys for deadfs. Probably redundant. */
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if (dsw->d_flags & D_TTY)
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vp->v_flag |= VISTTY;
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VOP_UNLOCK(vp, 0, td);
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error = (*dsw->d_open)(dev, ap->a_mode, S_IFCHR, td);
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
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if (error)
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return (error);
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if (dsw->d_flags & D_TTY) {
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if (dev->si_tty) {
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struct tty *tp;
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tp = dev->si_tty;
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if (!tp->t_stop) {
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printf("Warning:%s: no t_stop, using nottystop\n", devtoname(dev));
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tp->t_stop = nottystop;
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}
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}
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}
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if (vn_isdisk(vp, NULL)) {
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if (!dev->si_bsize_phys)
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dev->si_bsize_phys = DEV_BSIZE;
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}
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if ((dsw->d_flags & D_DISK) == 0) {
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cp = devtoname(dev);
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if (*cp == '#' && (dsw->d_flags & D_NAGGED) == 0) {
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printf("WARNING: driver %s should register devices with make_dev() (dev_t = \"%s\")\n",
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dsw->d_name, cp);
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dsw->d_flags |= D_NAGGED;
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}
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}
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return (error);
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}
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/*
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* Vnode op for read
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*/
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/* ARGSUSED */
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static int
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spec_read(ap)
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struct vop_read_args /* {
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struct vnode *a_vp;
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struct uio *a_uio;
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int a_ioflag;
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struct ucred *a_cred;
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} */ *ap;
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{
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struct vnode *vp;
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struct thread *td;
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struct uio *uio;
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dev_t dev;
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int error, resid;
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vp = ap->a_vp;
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dev = vp->v_rdev;
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uio = ap->a_uio;
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td = uio->uio_td;
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resid = uio->uio_resid;
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if (resid == 0)
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return (0);
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VOP_UNLOCK(vp, 0, td);
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error = (*devsw(dev)->d_read)(dev, uio, ap->a_ioflag);
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
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if (uio->uio_resid != resid || (error == 0 && resid != 0))
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vfs_timestamp(&dev->si_atime);
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return (error);
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}
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/*
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* Vnode op for write
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*/
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/* ARGSUSED */
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static int
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spec_write(ap)
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struct vop_write_args /* {
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struct vnode *a_vp;
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struct uio *a_uio;
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int a_ioflag;
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struct ucred *a_cred;
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} */ *ap;
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{
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struct vnode *vp;
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struct thread *td;
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struct uio *uio;
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dev_t dev;
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int error, resid;
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vp = ap->a_vp;
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dev = vp->v_rdev;
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uio = ap->a_uio;
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td = uio->uio_td;
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resid = uio->uio_resid;
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VOP_UNLOCK(vp, 0, td);
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error = (*devsw(dev)->d_write) (dev, uio, ap->a_ioflag);
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
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if (uio->uio_resid != resid || (error == 0 && resid != 0)) {
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vfs_timestamp(&dev->si_ctime);
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dev->si_mtime = dev->si_ctime;
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}
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return (error);
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}
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/*
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* Device ioctl operation.
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*/
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/* ARGSUSED */
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static int
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spec_ioctl(ap)
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struct vop_ioctl_args /* {
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struct vnode *a_vp;
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int a_command;
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caddr_t a_data;
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int a_fflag;
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struct ucred *a_cred;
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struct thread *a_td;
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} */ *ap;
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{
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dev_t dev;
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dev = ap->a_vp->v_rdev;
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return ((*devsw(dev)->d_ioctl)(dev, ap->a_command,
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ap->a_data, ap->a_fflag, ap->a_td));
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}
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/* ARGSUSED */
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static int
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spec_poll(ap)
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struct vop_poll_args /* {
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struct vnode *a_vp;
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int a_events;
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struct ucred *a_cred;
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struct thread *a_td;
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} */ *ap;
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{
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dev_t dev;
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dev = ap->a_vp->v_rdev;
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return (*devsw(dev)->d_poll)(dev, ap->a_events, ap->a_td);
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}
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/* ARGSUSED */
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static int
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spec_kqfilter(ap)
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struct vop_kqfilter_args /* {
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struct vnode *a_vp;
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struct knote *a_kn;
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} */ *ap;
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{
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dev_t dev;
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dev = ap->a_vp->v_rdev;
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if (devsw(dev)->d_flags & D_KQFILTER)
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return (*devsw(dev)->d_kqfilter)(dev, ap->a_kn);
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return (1);
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}
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/*
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* Synch buffers associated with a block device
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*/
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/* ARGSUSED */
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static int
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spec_fsync(ap)
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struct vop_fsync_args /* {
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struct vnode *a_vp;
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struct ucred *a_cred;
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int a_waitfor;
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struct thread *a_td;
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} */ *ap;
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{
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struct vnode *vp = ap->a_vp;
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struct buf *bp;
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struct buf *nbp;
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int s;
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int maxretry = 10000; /* large, arbitrarily chosen */
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if (!vn_isdisk(vp, NULL))
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return (0);
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loop1:
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/*
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* MARK/SCAN initialization to avoid infinite loops.
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*/
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s = splbio();
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TAILQ_FOREACH(bp, &vp->v_dirtyblkhd, b_vnbufs) {
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bp->b_flags &= ~B_SCANNED;
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}
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splx(s);
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/*
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* Flush all dirty buffers associated with a block device.
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*/
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loop2:
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s = splbio();
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for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp != NULL; bp = nbp) {
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nbp = TAILQ_NEXT(bp, b_vnbufs);
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if ((bp->b_flags & B_SCANNED) != 0)
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continue;
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bp->b_flags |= B_SCANNED;
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if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT))
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continue;
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if ((bp->b_flags & B_DELWRI) == 0)
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panic("spec_fsync: not dirty");
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if ((vp->v_flag & VOBJBUF) && (bp->b_flags & B_CLUSTEROK)) {
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BUF_UNLOCK(bp);
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vfs_bio_awrite(bp);
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splx(s);
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} else {
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bremfree(bp);
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splx(s);
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bawrite(bp);
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}
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goto loop2;
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}
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/*
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* If synchronous the caller expects us to completely resolve all
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* dirty buffers in the system. Wait for in-progress I/O to
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* complete (which could include background bitmap writes), then
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* retry if dirty blocks still exist.
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*/
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if (ap->a_waitfor == MNT_WAIT) {
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while (vp->v_numoutput) {
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vp->v_flag |= VBWAIT;
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(void)tsleep((caddr_t)&vp->v_numoutput, PRIBIO + 1,
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"spfsyn", 0);
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}
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if (!TAILQ_EMPTY(&vp->v_dirtyblkhd)) {
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if (--maxretry != 0) {
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splx(s);
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goto loop1;
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}
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vprint("spec_fsync: giving up on dirty", vp);
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}
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}
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splx(s);
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return (0);
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}
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/*
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* Just call the device strategy routine
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*/
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static int
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spec_strategy(ap)
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struct vop_strategy_args /* {
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struct vnode *a_vp;
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struct buf *a_bp;
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} */ *ap;
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{
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struct buf *bp;
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struct vnode *vp;
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struct mount *mp;
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int error;
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bp = ap->a_bp;
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vp = ap->a_vp;
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if (bp->b_iocmd == BIO_WRITE) {
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if ((bp->b_flags & B_VALIDSUSPWRT) == 0 &&
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bp->b_vp != NULL && bp->b_vp->v_mount != NULL &&
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(bp->b_vp->v_mount->mnt_kern_flag & MNTK_SUSPENDED) != 0)
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panic("spec_strategy: bad I/O");
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bp->b_flags &= ~B_VALIDSUSPWRT;
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if (LIST_FIRST(&bp->b_dep) != NULL)
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buf_start(bp);
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if ((vp->v_flag & VCOPYONWRITE) && vp->v_rdev->si_copyonwrite &&
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(error = (*vp->v_rdev->si_copyonwrite)(vp, bp)) != 0 &&
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error != EOPNOTSUPP) {
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bp->b_io.bio_error = error;
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bp->b_io.bio_flags |= BIO_ERROR;
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biodone(&bp->b_io);
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return (0);
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}
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}
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/*
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* Collect statistics on synchronous and asynchronous read
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* and write counts for disks that have associated filesystems.
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*/
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if (vn_isdisk(vp, NULL) && (mp = vp->v_rdev->si_mountpoint) != NULL) {
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if (bp->b_iocmd == BIO_WRITE) {
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if (bp->b_lock.lk_lockholder == LK_KERNPROC)
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|
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++;
|
|
}
|
|
}
|
|
if (devsw(bp->b_dev) == NULL) {
|
|
bp->b_io.bio_error = ENXIO;
|
|
bp->b_io.bio_flags |= BIO_ERROR;
|
|
biodone(&bp->b_io);
|
|
return (0);
|
|
}
|
|
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 thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *vp = ap->a_vp, *oldvp;
|
|
struct thread *td = ap->a_td;
|
|
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.
|
|
*/
|
|
oldvp = NULL;
|
|
PGRPSESS_XLOCK();
|
|
if (vcount(vp) == 2 && td && (vp->v_flag & VXLOCK) == 0 &&
|
|
vp == td->td_proc->p_session->s_ttyvp) {
|
|
SESS_LOCK(td->td_proc->p_session);
|
|
td->td_proc->p_session->s_ttyvp = NULL;
|
|
SESS_UNLOCK(td->td_proc->p_session);
|
|
oldvp = vp;
|
|
}
|
|
PGRPSESS_XUNLOCK();
|
|
if (oldvp != NULL)
|
|
vrele(oldvp);
|
|
/*
|
|
* 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, td));
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
|
|
GIANT_REQUIRED;
|
|
|
|
error = 0;
|
|
pcount = round_page(ap->a_count) / PAGE_SIZE;
|
|
|
|
/*
|
|
* Calculate the offset of the transfer and do a 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. */
|
|
KASSERT(bp->b_rcred == NOCRED, ("leaking read ucred"));
|
|
KASSERT(bp->b_wcred == NOCRED, ("leaking write ucred"));
|
|
bp->b_rcred = crhold(curthread->td_ucred);
|
|
bp->b_wcred = crhold(curthread->td_ucred);
|
|
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;
|
|
|
|
/* 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);
|
|
|
|
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;
|
|
}
|