1330 lines
30 KiB
C
1330 lines
30 KiB
C
/* $NetBSD: spec_vnops.c,v 1.175 2018/09/03 16:29:35 riastradh Exp $ */
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/*-
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* Copyright (c) 2008 The NetBSD Foundation, Inc.
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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1989, 1993
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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. 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 8.15 (Berkeley) 7/14/95
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: spec_vnops.c,v 1.175 2018/09/03 16:29:35 riastradh Exp $");
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#include <sys/param.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/buf.h>
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#include <sys/mount.h>
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#include <sys/namei.h>
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#include <sys/vnode_impl.h>
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#include <sys/stat.h>
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#include <sys/errno.h>
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#include <sys/ioctl.h>
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#include <sys/poll.h>
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#include <sys/file.h>
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#include <sys/disklabel.h>
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#include <sys/lockf.h>
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#include <sys/tty.h>
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#include <sys/kauth.h>
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#include <sys/fstrans.h>
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#include <sys/module.h>
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#include <miscfs/genfs/genfs.h>
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#include <miscfs/specfs/specdev.h>
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/* symbolic sleep message strings for devices */
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const char devopn[] = "devopn";
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const char devio[] = "devio";
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const char devwait[] = "devwait";
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const char devin[] = "devin";
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const char devout[] = "devout";
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const char devioc[] = "devioc";
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const char devcls[] = "devcls";
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#define SPECHSZ 64
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#if ((SPECHSZ&(SPECHSZ-1)) == 0)
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#define SPECHASH(rdev) (((rdev>>5)+(rdev))&(SPECHSZ-1))
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#else
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#define SPECHASH(rdev) (((unsigned)((rdev>>5)+(rdev)))%SPECHSZ)
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#endif
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static vnode_t *specfs_hash[SPECHSZ];
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extern struct mount *dead_rootmount;
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/*
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* This vnode operations vector is used for special device nodes
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* created from whole cloth by the kernel. For the ops vector for
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* vnodes built from special devices found in a filesystem, see (e.g)
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* ffs_specop_entries[] in ffs_vnops.c or the equivalent for other
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* filesystems.
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*/
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int (**spec_vnodeop_p)(void *);
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const struct vnodeopv_entry_desc spec_vnodeop_entries[] = {
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{ &vop_default_desc, vn_default_error },
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{ &vop_lookup_desc, spec_lookup }, /* lookup */
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{ &vop_create_desc, spec_create }, /* create */
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{ &vop_mknod_desc, spec_mknod }, /* mknod */
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{ &vop_open_desc, spec_open }, /* open */
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{ &vop_close_desc, spec_close }, /* close */
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{ &vop_access_desc, spec_access }, /* access */
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{ &vop_getattr_desc, spec_getattr }, /* getattr */
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{ &vop_setattr_desc, spec_setattr }, /* setattr */
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{ &vop_read_desc, spec_read }, /* read */
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{ &vop_write_desc, spec_write }, /* write */
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{ &vop_fallocate_desc, spec_fallocate }, /* fallocate */
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{ &vop_fdiscard_desc, spec_fdiscard }, /* fdiscard */
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{ &vop_fcntl_desc, spec_fcntl }, /* fcntl */
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{ &vop_ioctl_desc, spec_ioctl }, /* ioctl */
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{ &vop_poll_desc, spec_poll }, /* poll */
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{ &vop_kqfilter_desc, spec_kqfilter }, /* kqfilter */
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{ &vop_revoke_desc, spec_revoke }, /* revoke */
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{ &vop_mmap_desc, spec_mmap }, /* mmap */
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{ &vop_fsync_desc, spec_fsync }, /* fsync */
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{ &vop_seek_desc, spec_seek }, /* seek */
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{ &vop_remove_desc, spec_remove }, /* remove */
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{ &vop_link_desc, spec_link }, /* link */
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{ &vop_rename_desc, spec_rename }, /* rename */
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{ &vop_mkdir_desc, spec_mkdir }, /* mkdir */
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{ &vop_rmdir_desc, spec_rmdir }, /* rmdir */
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{ &vop_symlink_desc, spec_symlink }, /* symlink */
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{ &vop_readdir_desc, spec_readdir }, /* readdir */
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{ &vop_readlink_desc, spec_readlink }, /* readlink */
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{ &vop_abortop_desc, spec_abortop }, /* abortop */
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{ &vop_inactive_desc, spec_inactive }, /* inactive */
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{ &vop_reclaim_desc, spec_reclaim }, /* reclaim */
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{ &vop_lock_desc, spec_lock }, /* lock */
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{ &vop_unlock_desc, spec_unlock }, /* unlock */
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{ &vop_bmap_desc, spec_bmap }, /* bmap */
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{ &vop_strategy_desc, spec_strategy }, /* strategy */
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{ &vop_print_desc, spec_print }, /* print */
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{ &vop_islocked_desc, spec_islocked }, /* islocked */
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{ &vop_pathconf_desc, spec_pathconf }, /* pathconf */
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{ &vop_advlock_desc, spec_advlock }, /* advlock */
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{ &vop_bwrite_desc, spec_bwrite }, /* bwrite */
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{ &vop_getpages_desc, spec_getpages }, /* getpages */
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{ &vop_putpages_desc, spec_putpages }, /* putpages */
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{ NULL, NULL }
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};
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const struct vnodeopv_desc spec_vnodeop_opv_desc =
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{ &spec_vnodeop_p, spec_vnodeop_entries };
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static kauth_listener_t rawio_listener;
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/* Returns true if vnode is /dev/mem or /dev/kmem. */
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bool
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iskmemvp(struct vnode *vp)
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{
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return ((vp->v_type == VCHR) && iskmemdev(vp->v_rdev));
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}
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/*
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* Returns true if dev is /dev/mem or /dev/kmem.
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*/
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int
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iskmemdev(dev_t dev)
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{
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/* mem_no is emitted by config(8) to generated devsw.c */
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extern const int mem_no;
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/* minor 14 is /dev/io on i386 with COMPAT_10 */
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return (major(dev) == mem_no && (minor(dev) < 2 || minor(dev) == 14));
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}
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static int
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rawio_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie,
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void *arg0, void *arg1, void *arg2, void *arg3)
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{
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int result;
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result = KAUTH_RESULT_DEFER;
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if ((action != KAUTH_DEVICE_RAWIO_SPEC) &&
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(action != KAUTH_DEVICE_RAWIO_PASSTHRU))
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return result;
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/* Access is mandated by permissions. */
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result = KAUTH_RESULT_ALLOW;
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return result;
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}
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void
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spec_init(void)
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{
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rawio_listener = kauth_listen_scope(KAUTH_SCOPE_DEVICE,
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rawio_listener_cb, NULL);
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}
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/*
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* Initialize a vnode that represents a device.
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*/
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void
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spec_node_init(vnode_t *vp, dev_t rdev)
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{
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specnode_t *sn;
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specdev_t *sd;
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vnode_t *vp2;
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vnode_t **vpp;
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KASSERT(vp->v_type == VBLK || vp->v_type == VCHR);
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KASSERT(vp->v_specnode == NULL);
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/*
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* Search the hash table for this device. If known, add a
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* reference to the device structure. If not known, create
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* a new entry to represent the device. In all cases add
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* the vnode to the hash table.
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*/
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sn = kmem_alloc(sizeof(*sn), KM_SLEEP);
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sd = kmem_alloc(sizeof(*sd), KM_SLEEP);
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mutex_enter(&device_lock);
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vpp = &specfs_hash[SPECHASH(rdev)];
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for (vp2 = *vpp; vp2 != NULL; vp2 = vp2->v_specnext) {
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KASSERT(vp2->v_specnode != NULL);
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if (rdev == vp2->v_rdev && vp->v_type == vp2->v_type) {
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break;
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}
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}
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if (vp2 == NULL) {
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/* No existing record, create a new one. */
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sd->sd_rdev = rdev;
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sd->sd_mountpoint = NULL;
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sd->sd_lockf = NULL;
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sd->sd_refcnt = 1;
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sd->sd_opencnt = 0;
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sd->sd_bdevvp = NULL;
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sn->sn_dev = sd;
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sd = NULL;
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} else {
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/* Use the existing record. */
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sn->sn_dev = vp2->v_specnode->sn_dev;
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sn->sn_dev->sd_refcnt++;
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}
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/* Insert vnode into the hash chain. */
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sn->sn_opencnt = 0;
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sn->sn_rdev = rdev;
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sn->sn_gone = false;
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vp->v_specnode = sn;
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vp->v_specnext = *vpp;
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*vpp = vp;
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mutex_exit(&device_lock);
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/* Free the record we allocated if unused. */
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if (sd != NULL) {
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kmem_free(sd, sizeof(*sd));
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}
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}
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/*
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* Lookup a vnode by device number and return it referenced.
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*/
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int
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spec_node_lookup_by_dev(enum vtype type, dev_t dev, vnode_t **vpp)
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{
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int error;
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vnode_t *vp;
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mutex_enter(&device_lock);
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for (vp = specfs_hash[SPECHASH(dev)]; vp; vp = vp->v_specnext) {
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if (type == vp->v_type && dev == vp->v_rdev) {
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mutex_enter(vp->v_interlock);
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/* If clean or being cleaned, then ignore it. */
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if (vdead_check(vp, VDEAD_NOWAIT) == 0)
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break;
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mutex_exit(vp->v_interlock);
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}
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}
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KASSERT(vp == NULL || mutex_owned(vp->v_interlock));
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if (vp == NULL) {
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mutex_exit(&device_lock);
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return ENOENT;
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}
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/*
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* If it is an opened block device return the opened vnode.
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*/
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if (type == VBLK && vp->v_specnode->sn_dev->sd_bdevvp != NULL) {
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mutex_exit(vp->v_interlock);
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vp = vp->v_specnode->sn_dev->sd_bdevvp;
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mutex_enter(vp->v_interlock);
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}
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mutex_exit(&device_lock);
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error = vcache_vget(vp);
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if (error != 0)
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return error;
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*vpp = vp;
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return 0;
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}
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/*
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* Lookup a vnode by file system mounted on and return it referenced.
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*/
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int
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spec_node_lookup_by_mount(struct mount *mp, vnode_t **vpp)
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{
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int i, error;
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vnode_t *vp, *vq;
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mutex_enter(&device_lock);
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for (i = 0, vq = NULL; i < SPECHSZ && vq == NULL; i++) {
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for (vp = specfs_hash[i]; vp; vp = vp->v_specnext) {
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if (vp->v_type != VBLK)
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continue;
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vq = vp->v_specnode->sn_dev->sd_bdevvp;
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if (vq != NULL &&
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vq->v_specnode->sn_dev->sd_mountpoint == mp)
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break;
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vq = NULL;
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}
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}
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if (vq == NULL) {
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mutex_exit(&device_lock);
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return ENOENT;
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}
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mutex_enter(vq->v_interlock);
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mutex_exit(&device_lock);
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error = vcache_vget(vq);
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if (error != 0)
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return error;
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*vpp = vq;
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return 0;
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}
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/*
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* Get the file system mounted on this block device.
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*/
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struct mount *
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spec_node_getmountedfs(vnode_t *devvp)
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{
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struct mount *mp;
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KASSERT(devvp->v_type == VBLK);
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mp = devvp->v_specnode->sn_dev->sd_mountpoint;
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return mp;
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}
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/*
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* Set the file system mounted on this block device.
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*/
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void
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spec_node_setmountedfs(vnode_t *devvp, struct mount *mp)
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{
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KASSERT(devvp->v_type == VBLK);
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KASSERT(devvp->v_specnode->sn_dev->sd_mountpoint == NULL || mp == NULL);
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devvp->v_specnode->sn_dev->sd_mountpoint = mp;
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}
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/*
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* A vnode representing a special device is going away. Close
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* the device if the vnode holds it open.
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*/
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void
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spec_node_revoke(vnode_t *vp)
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{
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specnode_t *sn;
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specdev_t *sd;
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sn = vp->v_specnode;
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sd = sn->sn_dev;
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KASSERT(vp->v_type == VBLK || vp->v_type == VCHR);
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KASSERT(vp->v_specnode != NULL);
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KASSERT(sn->sn_gone == false);
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mutex_enter(&device_lock);
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KASSERT(sn->sn_opencnt <= sd->sd_opencnt);
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if (sn->sn_opencnt != 0) {
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sd->sd_opencnt -= (sn->sn_opencnt - 1);
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sn->sn_opencnt = 1;
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sn->sn_gone = true;
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mutex_exit(&device_lock);
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VOP_CLOSE(vp, FNONBLOCK, NOCRED);
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mutex_enter(&device_lock);
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KASSERT(sn->sn_opencnt == 0);
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}
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mutex_exit(&device_lock);
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}
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/*
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* A vnode representing a special device is being recycled.
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* Destroy the specfs component.
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*/
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void
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spec_node_destroy(vnode_t *vp)
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{
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specnode_t *sn;
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specdev_t *sd;
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vnode_t **vpp, *vp2;
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int refcnt;
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sn = vp->v_specnode;
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sd = sn->sn_dev;
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KASSERT(vp->v_type == VBLK || vp->v_type == VCHR);
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KASSERT(vp->v_specnode != NULL);
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KASSERT(sn->sn_opencnt == 0);
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mutex_enter(&device_lock);
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/* Remove from the hash and destroy the node. */
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vpp = &specfs_hash[SPECHASH(vp->v_rdev)];
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for (vp2 = *vpp;; vp2 = vp2->v_specnext) {
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if (vp2 == NULL) {
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panic("spec_node_destroy: corrupt hash");
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}
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if (vp2 == vp) {
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KASSERT(vp == *vpp);
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*vpp = vp->v_specnext;
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break;
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}
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if (vp2->v_specnext == vp) {
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vp2->v_specnext = vp->v_specnext;
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break;
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}
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}
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sn = vp->v_specnode;
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vp->v_specnode = NULL;
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refcnt = sd->sd_refcnt--;
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KASSERT(refcnt > 0);
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mutex_exit(&device_lock);
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/* If the device is no longer in use, destroy our record. */
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if (refcnt == 1) {
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KASSERT(sd->sd_opencnt == 0);
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KASSERT(sd->sd_bdevvp == NULL);
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kmem_free(sd, sizeof(*sd));
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}
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kmem_free(sn, sizeof(*sn));
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}
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/*
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* Trivial lookup routine that always fails.
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*/
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int
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spec_lookup(void *v)
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{
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struct vop_lookup_v2_args /* {
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struct vnode *a_dvp;
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struct vnode **a_vpp;
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struct componentname *a_cnp;
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} */ *ap = v;
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*ap->a_vpp = NULL;
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return (ENOTDIR);
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}
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typedef int (*spec_ioctl_t)(dev_t, u_long, void *, int, struct lwp *);
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/*
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* Open a special file.
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*/
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|
/* ARGSUSED */
|
|
int
|
|
spec_open(void *v)
|
|
{
|
|
struct vop_open_args /* {
|
|
struct vnode *a_vp;
|
|
int a_mode;
|
|
kauth_cred_t a_cred;
|
|
} */ *ap = v;
|
|
struct lwp *l;
|
|
struct vnode *vp;
|
|
dev_t dev;
|
|
int error;
|
|
enum kauth_device_req req;
|
|
specnode_t *sn;
|
|
specdev_t *sd;
|
|
spec_ioctl_t ioctl;
|
|
u_int gen;
|
|
const char *name;
|
|
struct partinfo pi;
|
|
|
|
l = curlwp;
|
|
vp = ap->a_vp;
|
|
dev = vp->v_rdev;
|
|
sn = vp->v_specnode;
|
|
sd = sn->sn_dev;
|
|
name = NULL;
|
|
gen = 0;
|
|
|
|
/*
|
|
* Don't allow open if fs is mounted -nodev.
|
|
*/
|
|
if (vp->v_mount && (vp->v_mount->mnt_flag & MNT_NODEV))
|
|
return (ENXIO);
|
|
|
|
switch (ap->a_mode & (FREAD | FWRITE)) {
|
|
case FREAD | FWRITE:
|
|
req = KAUTH_REQ_DEVICE_RAWIO_SPEC_RW;
|
|
break;
|
|
case FWRITE:
|
|
req = KAUTH_REQ_DEVICE_RAWIO_SPEC_WRITE;
|
|
break;
|
|
default:
|
|
req = KAUTH_REQ_DEVICE_RAWIO_SPEC_READ;
|
|
break;
|
|
}
|
|
|
|
switch (vp->v_type) {
|
|
case VCHR:
|
|
error = kauth_authorize_device_spec(ap->a_cred, req, vp);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
/*
|
|
* Character devices can accept opens from multiple
|
|
* vnodes.
|
|
*/
|
|
mutex_enter(&device_lock);
|
|
if (sn->sn_gone) {
|
|
mutex_exit(&device_lock);
|
|
return (EBADF);
|
|
}
|
|
sd->sd_opencnt++;
|
|
sn->sn_opencnt++;
|
|
mutex_exit(&device_lock);
|
|
if (cdev_type(dev) == D_TTY)
|
|
vp->v_vflag |= VV_ISTTY;
|
|
VOP_UNLOCK(vp);
|
|
do {
|
|
const struct cdevsw *cdev;
|
|
|
|
gen = module_gen;
|
|
error = cdev_open(dev, ap->a_mode, S_IFCHR, l);
|
|
if (error != ENXIO)
|
|
break;
|
|
|
|
/* Check if we already have a valid driver */
|
|
mutex_enter(&device_lock);
|
|
cdev = cdevsw_lookup(dev);
|
|
mutex_exit(&device_lock);
|
|
if (cdev != NULL)
|
|
break;
|
|
|
|
/* Get device name from devsw_conv array */
|
|
if ((name = cdevsw_getname(major(dev))) == NULL)
|
|
break;
|
|
|
|
/* Try to autoload device module */
|
|
(void) module_autoload(name, MODULE_CLASS_DRIVER);
|
|
} while (gen != module_gen);
|
|
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
break;
|
|
|
|
case VBLK:
|
|
error = kauth_authorize_device_spec(ap->a_cred, req, vp);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
/*
|
|
* For block devices, permit only one open. The buffer
|
|
* cache cannot remain self-consistent with multiple
|
|
* vnodes holding a block device open.
|
|
*
|
|
* Treat zero opencnt with non-NULL mountpoint as open.
|
|
* This may happen after forced detach of a mounted device.
|
|
*/
|
|
mutex_enter(&device_lock);
|
|
if (sn->sn_gone) {
|
|
mutex_exit(&device_lock);
|
|
return (EBADF);
|
|
}
|
|
if (sd->sd_opencnt != 0 || sd->sd_mountpoint != NULL) {
|
|
mutex_exit(&device_lock);
|
|
return EBUSY;
|
|
}
|
|
sn->sn_opencnt = 1;
|
|
sd->sd_opencnt = 1;
|
|
sd->sd_bdevvp = vp;
|
|
mutex_exit(&device_lock);
|
|
do {
|
|
const struct bdevsw *bdev;
|
|
|
|
gen = module_gen;
|
|
error = bdev_open(dev, ap->a_mode, S_IFBLK, l);
|
|
if (error != ENXIO)
|
|
break;
|
|
|
|
/* Check if we already have a valid driver */
|
|
mutex_enter(&device_lock);
|
|
bdev = bdevsw_lookup(dev);
|
|
mutex_exit(&device_lock);
|
|
if (bdev != NULL)
|
|
break;
|
|
|
|
/* Get device name from devsw_conv array */
|
|
if ((name = bdevsw_getname(major(dev))) == NULL)
|
|
break;
|
|
|
|
VOP_UNLOCK(vp);
|
|
|
|
/* Try to autoload device module */
|
|
(void) module_autoload(name, MODULE_CLASS_DRIVER);
|
|
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
} while (gen != module_gen);
|
|
|
|
break;
|
|
|
|
case VNON:
|
|
case VLNK:
|
|
case VDIR:
|
|
case VREG:
|
|
case VBAD:
|
|
case VFIFO:
|
|
case VSOCK:
|
|
default:
|
|
return 0;
|
|
}
|
|
|
|
mutex_enter(&device_lock);
|
|
if (sn->sn_gone) {
|
|
if (error == 0)
|
|
error = EBADF;
|
|
} else if (error != 0) {
|
|
sd->sd_opencnt--;
|
|
sn->sn_opencnt--;
|
|
if (vp->v_type == VBLK)
|
|
sd->sd_bdevvp = NULL;
|
|
|
|
}
|
|
mutex_exit(&device_lock);
|
|
|
|
if (cdev_type(dev) != D_DISK || error != 0)
|
|
return error;
|
|
|
|
|
|
ioctl = vp->v_type == VCHR ? cdev_ioctl : bdev_ioctl;
|
|
error = (*ioctl)(vp->v_rdev, DIOCGPARTINFO, &pi, FREAD, curlwp);
|
|
if (error == 0)
|
|
uvm_vnp_setsize(vp, (voff_t)pi.pi_secsize * pi.pi_size);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Vnode op for read
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
spec_read(void *v)
|
|
{
|
|
struct vop_read_args /* {
|
|
struct vnode *a_vp;
|
|
struct uio *a_uio;
|
|
int a_ioflag;
|
|
kauth_cred_t a_cred;
|
|
} */ *ap = v;
|
|
struct vnode *vp = ap->a_vp;
|
|
struct uio *uio = ap->a_uio;
|
|
struct lwp *l = curlwp;
|
|
struct buf *bp;
|
|
daddr_t bn;
|
|
int bsize, bscale;
|
|
struct partinfo pi;
|
|
int n, on;
|
|
int error = 0;
|
|
|
|
KASSERT(uio->uio_rw == UIO_READ);
|
|
KASSERTMSG(VMSPACE_IS_KERNEL_P(uio->uio_vmspace) ||
|
|
uio->uio_vmspace == curproc->p_vmspace,
|
|
"vmspace belongs to neither kernel nor curproc");
|
|
|
|
if (uio->uio_resid == 0)
|
|
return (0);
|
|
|
|
switch (vp->v_type) {
|
|
|
|
case VCHR:
|
|
VOP_UNLOCK(vp);
|
|
error = cdev_read(vp->v_rdev, uio, ap->a_ioflag);
|
|
vn_lock(vp, LK_SHARED | LK_RETRY);
|
|
return (error);
|
|
|
|
case VBLK:
|
|
KASSERT(vp == vp->v_specnode->sn_dev->sd_bdevvp);
|
|
if (uio->uio_offset < 0)
|
|
return (EINVAL);
|
|
|
|
if (bdev_ioctl(vp->v_rdev, DIOCGPARTINFO, &pi, FREAD, l) == 0)
|
|
bsize = pi.pi_bsize;
|
|
else
|
|
bsize = BLKDEV_IOSIZE;
|
|
|
|
bscale = bsize >> DEV_BSHIFT;
|
|
do {
|
|
bn = (uio->uio_offset >> DEV_BSHIFT) &~ (bscale - 1);
|
|
on = uio->uio_offset % bsize;
|
|
n = uimin((unsigned)(bsize - on), uio->uio_resid);
|
|
error = bread(vp, bn, bsize, 0, &bp);
|
|
if (error) {
|
|
return (error);
|
|
}
|
|
n = uimin(n, bsize - bp->b_resid);
|
|
error = uiomove((char *)bp->b_data + on, n, uio);
|
|
brelse(bp, 0);
|
|
} while (error == 0 && uio->uio_resid > 0 && n != 0);
|
|
return (error);
|
|
|
|
default:
|
|
panic("spec_read type");
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/*
|
|
* Vnode op for write
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
spec_write(void *v)
|
|
{
|
|
struct vop_write_args /* {
|
|
struct vnode *a_vp;
|
|
struct uio *a_uio;
|
|
int a_ioflag;
|
|
kauth_cred_t a_cred;
|
|
} */ *ap = v;
|
|
struct vnode *vp = ap->a_vp;
|
|
struct uio *uio = ap->a_uio;
|
|
struct lwp *l = curlwp;
|
|
struct buf *bp;
|
|
daddr_t bn;
|
|
int bsize, bscale;
|
|
struct partinfo pi;
|
|
int n, on;
|
|
int error = 0;
|
|
|
|
KASSERT(uio->uio_rw == UIO_WRITE);
|
|
KASSERTMSG(VMSPACE_IS_KERNEL_P(uio->uio_vmspace) ||
|
|
uio->uio_vmspace == curproc->p_vmspace,
|
|
"vmspace belongs to neither kernel nor curproc");
|
|
|
|
switch (vp->v_type) {
|
|
|
|
case VCHR:
|
|
VOP_UNLOCK(vp);
|
|
error = cdev_write(vp->v_rdev, uio, ap->a_ioflag);
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
return (error);
|
|
|
|
case VBLK:
|
|
KASSERT(vp == vp->v_specnode->sn_dev->sd_bdevvp);
|
|
if (uio->uio_resid == 0)
|
|
return (0);
|
|
if (uio->uio_offset < 0)
|
|
return (EINVAL);
|
|
|
|
if (bdev_ioctl(vp->v_rdev, DIOCGPARTINFO, &pi, FREAD, l) == 0)
|
|
bsize = pi.pi_bsize;
|
|
else
|
|
bsize = BLKDEV_IOSIZE;
|
|
|
|
bscale = bsize >> DEV_BSHIFT;
|
|
do {
|
|
bn = (uio->uio_offset >> DEV_BSHIFT) &~ (bscale - 1);
|
|
on = uio->uio_offset % bsize;
|
|
n = uimin((unsigned)(bsize - on), uio->uio_resid);
|
|
if (n == bsize)
|
|
bp = getblk(vp, bn, bsize, 0, 0);
|
|
else
|
|
error = bread(vp, bn, bsize, B_MODIFY, &bp);
|
|
if (error) {
|
|
return (error);
|
|
}
|
|
n = uimin(n, bsize - bp->b_resid);
|
|
error = uiomove((char *)bp->b_data + on, n, uio);
|
|
if (error)
|
|
brelse(bp, 0);
|
|
else {
|
|
if (n + on == bsize)
|
|
bawrite(bp);
|
|
else
|
|
bdwrite(bp);
|
|
error = bp->b_error;
|
|
}
|
|
} while (error == 0 && uio->uio_resid > 0 && n != 0);
|
|
return (error);
|
|
|
|
default:
|
|
panic("spec_write type");
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/*
|
|
* fdiscard, which on disk devices becomes TRIM.
|
|
*/
|
|
int
|
|
spec_fdiscard(void *v)
|
|
{
|
|
struct vop_fdiscard_args /* {
|
|
struct vnode *a_vp;
|
|
off_t a_pos;
|
|
off_t a_len;
|
|
} */ *ap = v;
|
|
struct vnode *vp;
|
|
dev_t dev;
|
|
|
|
vp = ap->a_vp;
|
|
dev = NODEV;
|
|
|
|
mutex_enter(vp->v_interlock);
|
|
if (vdead_check(vp, VDEAD_NOWAIT) == 0 && vp->v_specnode != NULL) {
|
|
dev = vp->v_rdev;
|
|
}
|
|
mutex_exit(vp->v_interlock);
|
|
|
|
if (dev == NODEV) {
|
|
return ENXIO;
|
|
}
|
|
|
|
switch (vp->v_type) {
|
|
case VCHR:
|
|
// this is not stored for character devices
|
|
//KASSERT(vp == vp->v_specnode->sn_dev->sd_cdevvp);
|
|
return cdev_discard(dev, ap->a_pos, ap->a_len);
|
|
case VBLK:
|
|
KASSERT(vp == vp->v_specnode->sn_dev->sd_bdevvp);
|
|
return bdev_discard(dev, ap->a_pos, ap->a_len);
|
|
default:
|
|
panic("spec_fdiscard: not a device\n");
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Device ioctl operation.
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
spec_ioctl(void *v)
|
|
{
|
|
struct vop_ioctl_args /* {
|
|
struct vnode *a_vp;
|
|
u_long a_command;
|
|
void *a_data;
|
|
int a_fflag;
|
|
kauth_cred_t a_cred;
|
|
} */ *ap = v;
|
|
struct vnode *vp;
|
|
dev_t dev;
|
|
|
|
/*
|
|
* Extract all the info we need from the vnode, taking care to
|
|
* avoid a race with VOP_REVOKE().
|
|
*/
|
|
|
|
vp = ap->a_vp;
|
|
dev = NODEV;
|
|
mutex_enter(vp->v_interlock);
|
|
if (vdead_check(vp, VDEAD_NOWAIT) == 0 && vp->v_specnode) {
|
|
dev = vp->v_rdev;
|
|
}
|
|
mutex_exit(vp->v_interlock);
|
|
if (dev == NODEV) {
|
|
return ENXIO;
|
|
}
|
|
|
|
switch (vp->v_type) {
|
|
|
|
case VCHR:
|
|
return cdev_ioctl(dev, ap->a_command, ap->a_data,
|
|
ap->a_fflag, curlwp);
|
|
|
|
case VBLK:
|
|
KASSERT(vp == vp->v_specnode->sn_dev->sd_bdevvp);
|
|
return bdev_ioctl(dev, ap->a_command, ap->a_data,
|
|
ap->a_fflag, curlwp);
|
|
|
|
default:
|
|
panic("spec_ioctl");
|
|
/* NOTREACHED */
|
|
}
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
int
|
|
spec_poll(void *v)
|
|
{
|
|
struct vop_poll_args /* {
|
|
struct vnode *a_vp;
|
|
int a_events;
|
|
} */ *ap = v;
|
|
struct vnode *vp;
|
|
dev_t dev;
|
|
|
|
/*
|
|
* Extract all the info we need from the vnode, taking care to
|
|
* avoid a race with VOP_REVOKE().
|
|
*/
|
|
|
|
vp = ap->a_vp;
|
|
dev = NODEV;
|
|
mutex_enter(vp->v_interlock);
|
|
if (vdead_check(vp, VDEAD_NOWAIT) == 0 && vp->v_specnode) {
|
|
dev = vp->v_rdev;
|
|
}
|
|
mutex_exit(vp->v_interlock);
|
|
if (dev == NODEV) {
|
|
return POLLERR;
|
|
}
|
|
|
|
switch (vp->v_type) {
|
|
|
|
case VCHR:
|
|
return cdev_poll(dev, ap->a_events, curlwp);
|
|
|
|
default:
|
|
return (genfs_poll(v));
|
|
}
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
int
|
|
spec_kqfilter(void *v)
|
|
{
|
|
struct vop_kqfilter_args /* {
|
|
struct vnode *a_vp;
|
|
struct proc *a_kn;
|
|
} */ *ap = v;
|
|
dev_t dev;
|
|
|
|
switch (ap->a_vp->v_type) {
|
|
|
|
case VCHR:
|
|
dev = ap->a_vp->v_rdev;
|
|
return cdev_kqfilter(dev, ap->a_kn);
|
|
default:
|
|
/*
|
|
* Block devices don't support kqfilter, and refuse it
|
|
* for any other files (like those vflush()ed) too.
|
|
*/
|
|
return (EOPNOTSUPP);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Allow mapping of only D_DISK. This is called only for VBLK.
|
|
*/
|
|
int
|
|
spec_mmap(void *v)
|
|
{
|
|
struct vop_mmap_args /* {
|
|
struct vnode *a_vp;
|
|
vm_prot_t a_prot;
|
|
kauth_cred_t a_cred;
|
|
} */ *ap = v;
|
|
struct vnode *vp = ap->a_vp;
|
|
|
|
KASSERT(vp->v_type == VBLK);
|
|
if (bdev_type(vp->v_rdev) != D_DISK)
|
|
return EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Synch buffers associated with a block device
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
spec_fsync(void *v)
|
|
{
|
|
struct vop_fsync_args /* {
|
|
struct vnode *a_vp;
|
|
kauth_cred_t a_cred;
|
|
int a_flags;
|
|
off_t offlo;
|
|
off_t offhi;
|
|
} */ *ap = v;
|
|
struct vnode *vp = ap->a_vp;
|
|
struct mount *mp;
|
|
int error;
|
|
|
|
if (vp->v_type == VBLK) {
|
|
if ((mp = spec_node_getmountedfs(vp)) != NULL) {
|
|
error = VFS_FSYNC(mp, vp, ap->a_flags);
|
|
if (error != EOPNOTSUPP)
|
|
return error;
|
|
}
|
|
return vflushbuf(vp, ap->a_flags);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Just call the device strategy routine
|
|
*/
|
|
int
|
|
spec_strategy(void *v)
|
|
{
|
|
struct vop_strategy_args /* {
|
|
struct vnode *a_vp;
|
|
struct buf *a_bp;
|
|
} */ *ap = v;
|
|
struct vnode *vp = ap->a_vp;
|
|
struct buf *bp = ap->a_bp;
|
|
dev_t dev;
|
|
int error;
|
|
|
|
dev = NODEV;
|
|
|
|
/*
|
|
* Extract all the info we need from the vnode, taking care to
|
|
* avoid a race with VOP_REVOKE().
|
|
*/
|
|
|
|
mutex_enter(vp->v_interlock);
|
|
if (vdead_check(vp, VDEAD_NOWAIT) == 0 && vp->v_specnode != NULL) {
|
|
KASSERT(vp == vp->v_specnode->sn_dev->sd_bdevvp);
|
|
dev = vp->v_rdev;
|
|
}
|
|
mutex_exit(vp->v_interlock);
|
|
|
|
if (dev == NODEV) {
|
|
error = ENXIO;
|
|
goto out;
|
|
}
|
|
bp->b_dev = dev;
|
|
|
|
if (!(bp->b_flags & B_READ)) {
|
|
#ifdef DIAGNOSTIC
|
|
if (bp->b_vp && bp->b_vp->v_type == VBLK) {
|
|
struct mount *mp = spec_node_getmountedfs(bp->b_vp);
|
|
|
|
if (mp && (mp->mnt_flag & MNT_RDONLY)) {
|
|
printf("%s blk %"PRId64" written while ro!\n",
|
|
mp->mnt_stat.f_mntonname, bp->b_blkno);
|
|
}
|
|
}
|
|
#endif /* DIAGNOSTIC */
|
|
error = fscow_run(bp, false);
|
|
if (error)
|
|
goto out;
|
|
}
|
|
bdev_strategy(bp);
|
|
|
|
return 0;
|
|
|
|
out:
|
|
bp->b_error = error;
|
|
bp->b_resid = bp->b_bcount;
|
|
biodone(bp);
|
|
|
|
return error;
|
|
}
|
|
|
|
int
|
|
spec_inactive(void *v)
|
|
{
|
|
struct vop_inactive_v2_args /* {
|
|
struct vnode *a_vp;
|
|
struct bool *a_recycle;
|
|
} */ *ap = v;
|
|
|
|
KASSERT(ap->a_vp->v_mount == dead_rootmount);
|
|
*ap->a_recycle = true;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
spec_reclaim(void *v)
|
|
{
|
|
struct vop_reclaim_v2_args /* {
|
|
struct vnode *a_vp;
|
|
} */ *ap = v;
|
|
struct vnode *vp = ap->a_vp;
|
|
|
|
VOP_UNLOCK(vp);
|
|
|
|
KASSERT(vp->v_mount == dead_rootmount);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This is a noop, simply returning what one has been given.
|
|
*/
|
|
int
|
|
spec_bmap(void *v)
|
|
{
|
|
struct vop_bmap_args /* {
|
|
struct vnode *a_vp;
|
|
daddr_t a_bn;
|
|
struct vnode **a_vpp;
|
|
daddr_t *a_bnp;
|
|
int *a_runp;
|
|
} */ *ap = v;
|
|
|
|
if (ap->a_vpp != NULL)
|
|
*ap->a_vpp = ap->a_vp;
|
|
if (ap->a_bnp != NULL)
|
|
*ap->a_bnp = ap->a_bn;
|
|
if (ap->a_runp != NULL)
|
|
*ap->a_runp = (MAXBSIZE >> DEV_BSHIFT) - 1;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Device close routine
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
spec_close(void *v)
|
|
{
|
|
struct vop_close_args /* {
|
|
struct vnode *a_vp;
|
|
int a_fflag;
|
|
kauth_cred_t a_cred;
|
|
} */ *ap = v;
|
|
struct vnode *vp = ap->a_vp;
|
|
struct session *sess;
|
|
dev_t dev = vp->v_rdev;
|
|
int flags = ap->a_fflag;
|
|
int mode, error, count;
|
|
specnode_t *sn;
|
|
specdev_t *sd;
|
|
|
|
mutex_enter(vp->v_interlock);
|
|
sn = vp->v_specnode;
|
|
sd = sn->sn_dev;
|
|
/*
|
|
* If we're going away soon, make this non-blocking.
|
|
* Also ensures that we won't wedge in vn_lock below.
|
|
*/
|
|
if (vdead_check(vp, VDEAD_NOWAIT) != 0)
|
|
flags |= FNONBLOCK;
|
|
mutex_exit(vp->v_interlock);
|
|
|
|
switch (vp->v_type) {
|
|
|
|
case VCHR:
|
|
/*
|
|
* 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
|
|
* open count is 1 release the reference from the
|
|
* session. Also, remove the link from the tty back to
|
|
* the session and pgrp.
|
|
*
|
|
* XXX V. fishy.
|
|
*/
|
|
mutex_enter(proc_lock);
|
|
sess = curlwp->l_proc->p_session;
|
|
if (sn->sn_opencnt == 1 && vp == sess->s_ttyvp) {
|
|
mutex_spin_enter(&tty_lock);
|
|
sess->s_ttyvp = NULL;
|
|
if (sess->s_ttyp->t_session != NULL) {
|
|
sess->s_ttyp->t_pgrp = NULL;
|
|
sess->s_ttyp->t_session = NULL;
|
|
mutex_spin_exit(&tty_lock);
|
|
/* Releases proc_lock. */
|
|
proc_sessrele(sess);
|
|
} else {
|
|
mutex_spin_exit(&tty_lock);
|
|
if (sess->s_ttyp->t_pgrp != NULL)
|
|
panic("spec_close: spurious pgrp ref");
|
|
mutex_exit(proc_lock);
|
|
}
|
|
vrele(vp);
|
|
} else
|
|
mutex_exit(proc_lock);
|
|
|
|
/*
|
|
* If the vnode is locked, then we are in the midst
|
|
* of forcably closing the device, otherwise we only
|
|
* close on last reference.
|
|
*/
|
|
mode = S_IFCHR;
|
|
break;
|
|
|
|
case VBLK:
|
|
KASSERT(vp == vp->v_specnode->sn_dev->sd_bdevvp);
|
|
/*
|
|
* On last close of a block device (that isn't mounted)
|
|
* we must invalidate any in core blocks, so that
|
|
* we can, for instance, change floppy disks.
|
|
*/
|
|
error = vinvalbuf(vp, V_SAVE, ap->a_cred, curlwp, 0, 0);
|
|
if (error)
|
|
return (error);
|
|
/*
|
|
* 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.
|
|
*/
|
|
mode = S_IFBLK;
|
|
break;
|
|
|
|
default:
|
|
panic("spec_close: not special");
|
|
}
|
|
|
|
mutex_enter(&device_lock);
|
|
sn->sn_opencnt--;
|
|
count = --sd->sd_opencnt;
|
|
if (vp->v_type == VBLK)
|
|
sd->sd_bdevvp = NULL;
|
|
mutex_exit(&device_lock);
|
|
|
|
if (count != 0 && (vp->v_type != VCHR || !(cdev_flags(dev) & D_MCLOSE)))
|
|
return 0;
|
|
|
|
/*
|
|
* If we're able to block, release the vnode lock & reacquire. We
|
|
* might end up sleeping for someone else who wants our queues. They
|
|
* won't get them if we hold the vnode locked.
|
|
*/
|
|
if (!(flags & FNONBLOCK))
|
|
VOP_UNLOCK(vp);
|
|
|
|
if (vp->v_type == VBLK)
|
|
error = bdev_close(dev, flags, mode, curlwp);
|
|
else
|
|
error = cdev_close(dev, flags, mode, curlwp);
|
|
|
|
if (!(flags & FNONBLOCK))
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Print out the contents of a special device vnode.
|
|
*/
|
|
int
|
|
spec_print(void *v)
|
|
{
|
|
struct vop_print_args /* {
|
|
struct vnode *a_vp;
|
|
} */ *ap = v;
|
|
|
|
printf("dev %llu, %llu\n", (unsigned long long)major(ap->a_vp->v_rdev),
|
|
(unsigned long long)minor(ap->a_vp->v_rdev));
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Return POSIX pathconf information applicable to special devices.
|
|
*/
|
|
int
|
|
spec_pathconf(void *v)
|
|
{
|
|
struct vop_pathconf_args /* {
|
|
struct vnode *a_vp;
|
|
int a_name;
|
|
register_t *a_retval;
|
|
} */ *ap = v;
|
|
|
|
switch (ap->a_name) {
|
|
case _PC_LINK_MAX:
|
|
*ap->a_retval = LINK_MAX;
|
|
return (0);
|
|
case _PC_MAX_CANON:
|
|
*ap->a_retval = MAX_CANON;
|
|
return (0);
|
|
case _PC_MAX_INPUT:
|
|
*ap->a_retval = MAX_INPUT;
|
|
return (0);
|
|
case _PC_PIPE_BUF:
|
|
*ap->a_retval = PIPE_BUF;
|
|
return (0);
|
|
case _PC_CHOWN_RESTRICTED:
|
|
*ap->a_retval = 1;
|
|
return (0);
|
|
case _PC_VDISABLE:
|
|
*ap->a_retval = _POSIX_VDISABLE;
|
|
return (0);
|
|
case _PC_SYNC_IO:
|
|
*ap->a_retval = 1;
|
|
return (0);
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/*
|
|
* Advisory record locking support.
|
|
*/
|
|
int
|
|
spec_advlock(void *v)
|
|
{
|
|
struct vop_advlock_args /* {
|
|
struct vnode *a_vp;
|
|
void *a_id;
|
|
int a_op;
|
|
struct flock *a_fl;
|
|
int a_flags;
|
|
} */ *ap = v;
|
|
struct vnode *vp = ap->a_vp;
|
|
|
|
return lf_advlock(ap, &vp->v_speclockf, (off_t)0);
|
|
}
|