381 lines
12 KiB
C
381 lines
12 KiB
C
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/*
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* Copyright (c) 2000-2019 Apple Inc. All rights reserved.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. The rights granted to you under the License
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* may not be used to create, or enable the creation or redistribution of,
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* unlawful or unlicensed copies of an Apple operating system, or to
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* circumvent, violate, or enable the circumvention or violation of, any
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* terms of an Apple operating system software license agreement.
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*
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* Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
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*/
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/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
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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. 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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* @(#)dead_vnops.c 8.3 (Berkeley) 5/14/95
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/time.h>
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#include <sys/vnode_internal.h>
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#include <sys/buf_internal.h>
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#include <sys/errno.h>
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#include <sys/namei.h>
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#include <sys/buf.h>
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#include <vfs/vfs_support.h>
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int chkvnlock(vnode_t vp);
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/*
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* Prototypes for dead operations on vnodes.
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*/
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int dead_badop(void *);
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int dead_ebadf(void *);
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int dead_lookup(struct vnop_lookup_args *);
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int dead_open(struct vnop_open_args *);
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#define dead_access (int (*)(struct vnop_access_args *))dead_ebadf
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#define dead_getattr (int (*)(struct vnop_getattr_args *))dead_ebadf
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#define dead_setattr (int (*)(struct vnop_setattr_args *))dead_ebadf
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int dead_read(struct vnop_read_args *);
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int dead_write(struct vnop_write_args *);
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int dead_ioctl(struct vnop_ioctl_args *);
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int dead_select(struct vnop_select_args *);
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#define dead_readdir (int (*)(struct vnop_readdir_args *))dead_ebadf
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#define dead_readlink (int (*)(struct vnop_readlink_args *))dead_ebadf
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int dead_strategy(struct vnop_strategy_args *);
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int dead_bwrite(struct vnop_bwrite_args *);
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#define dead_pathconf (int (*)(struct vnop_pathconf_args *))dead_ebadf
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#define dead_advlock (int (*)(struct vnop_advlock_args *))dead_ebadf
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int dead_pagein(struct vnop_pagein_args *);
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int dead_pageout(struct vnop_pageout_args *);
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int dead_blktooff(struct vnop_blktooff_args *);
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int dead_offtoblk(struct vnop_offtoblk_args *);
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int dead_blockmap(struct vnop_blockmap_args *);
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#define dead_nullop (void (*)(void))nullop
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#define VOPFUNC int (*)(void *)
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int(**dead_vnodeop_p)(void *);
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const struct vnodeopv_entry_desc dead_vnodeop_entries[] = {
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{ .opve_op = &vnop_default_desc, .opve_impl = (VOPFUNC)(void (*)(void ))vn_default_error },
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{ .opve_op = &vnop_lookup_desc, .opve_impl = (VOPFUNC)dead_lookup }, /* lookup */
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{ .opve_op = &vnop_create_desc, .opve_impl = (VOPFUNC)dead_badop }, /* create */
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{ .opve_op = &vnop_open_desc, .opve_impl = (VOPFUNC)dead_open }, /* open */
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{ .opve_op = &vnop_mknod_desc, .opve_impl = (VOPFUNC)dead_badop }, /* mknod */
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{ .opve_op = &vnop_close_desc, .opve_impl = (VOPFUNC)dead_nullop }, /* close */
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{ .opve_op = &vnop_access_desc, .opve_impl = (VOPFUNC)dead_access }, /* access */
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{ .opve_op = &vnop_getattr_desc, .opve_impl = (VOPFUNC)dead_getattr }, /* getattr */
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{ .opve_op = &vnop_setattr_desc, .opve_impl = (VOPFUNC)dead_setattr }, /* setattr */
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{ .opve_op = &vnop_read_desc, .opve_impl = (VOPFUNC)dead_read }, /* read */
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{ .opve_op = &vnop_write_desc, .opve_impl = (VOPFUNC)dead_write }, /* write */
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{ .opve_op = &vnop_ioctl_desc, .opve_impl = (VOPFUNC)dead_ioctl }, /* ioctl */
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{ .opve_op = &vnop_select_desc, .opve_impl = (VOPFUNC)dead_select }, /* select */
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{ .opve_op = &vnop_mmap_desc, .opve_impl = (VOPFUNC)dead_badop }, /* mmap */
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{ .opve_op = &vnop_fsync_desc, .opve_impl = (VOPFUNC)dead_nullop}, /* fsync */
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{ .opve_op = &vnop_remove_desc, .opve_impl = (VOPFUNC)dead_badop }, /* remove */
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{ .opve_op = &vnop_link_desc, .opve_impl = (VOPFUNC)dead_badop }, /* link */
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{ .opve_op = &vnop_rename_desc, .opve_impl = (VOPFUNC)dead_badop }, /* rename */
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{ .opve_op = &vnop_mkdir_desc, .opve_impl = (VOPFUNC)dead_badop }, /* mkdir */
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{ .opve_op = &vnop_rmdir_desc, .opve_impl = (VOPFUNC)dead_badop }, /* rmdir */
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{ .opve_op = &vnop_symlink_desc, .opve_impl = (VOPFUNC)dead_badop }, /* symlink */
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{ .opve_op = &vnop_readdir_desc, .opve_impl = (VOPFUNC)dead_readdir }, /* readdir */
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{ .opve_op = &vnop_readlink_desc, .opve_impl = (VOPFUNC)dead_readlink }, /* readlink */
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{ .opve_op = &vnop_inactive_desc, .opve_impl = (VOPFUNC)dead_nullop }, /* inactive */
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{ .opve_op = &vnop_reclaim_desc, .opve_impl = (VOPFUNC)dead_nullop }, /* reclaim */
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{ .opve_op = &vnop_strategy_desc, .opve_impl = (VOPFUNC)dead_strategy }, /* strategy */
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{ .opve_op = &vnop_pathconf_desc, .opve_impl = (VOPFUNC)dead_pathconf }, /* pathconf */
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{ .opve_op = &vnop_advlock_desc, .opve_impl = (VOPFUNC)dead_advlock }, /* advlock */
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{ .opve_op = &vnop_bwrite_desc, .opve_impl = (VOPFUNC)dead_bwrite }, /* bwrite */
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{ .opve_op = &vnop_pagein_desc, .opve_impl = (VOPFUNC)err_pagein }, /* Pagein */
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{ .opve_op = &vnop_pageout_desc, .opve_impl = (VOPFUNC)err_pageout }, /* Pageout */
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{ .opve_op = &vnop_copyfile_desc, .opve_impl = (VOPFUNC)err_copyfile }, /* Copyfile */
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{ .opve_op = &vnop_blktooff_desc, .opve_impl = (VOPFUNC)dead_blktooff }, /* blktooff */
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{ .opve_op = &vnop_offtoblk_desc, .opve_impl = (VOPFUNC)dead_offtoblk }, /* offtoblk */
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{ .opve_op = &vnop_blockmap_desc, .opve_impl = (VOPFUNC)dead_blockmap }, /* blockmap */
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{ .opve_op = (struct vnodeop_desc*)NULL, .opve_impl = (VOPFUNC)NULL }
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};
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const struct vnodeopv_desc dead_vnodeop_opv_desc =
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{ .opv_desc_vector_p = &dead_vnodeop_p, .opv_desc_ops = dead_vnodeop_entries };
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/*
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* Trivial lookup routine that always fails.
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*/
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/* ARGSUSED */
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int
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dead_lookup(struct vnop_lookup_args *ap)
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{
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*ap->a_vpp = NULL;
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return ENOTDIR;
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}
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/*
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* Open always fails as if device did not exist.
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*/
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/* ARGSUSED */
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int
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dead_open(__unused struct vnop_open_args *ap)
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{
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return ENXIO;
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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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int
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dead_read(struct vnop_read_args *ap)
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{
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if (chkvnlock(ap->a_vp)) {
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panic("dead_read: lock");
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}
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/*
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* Return EOF for character devices, EIO for others
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*/
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if (ap->a_vp->v_type != VCHR) {
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return EIO;
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}
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return 0;
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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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int
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dead_write(struct vnop_write_args *ap)
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{
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if (chkvnlock(ap->a_vp)) {
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panic("dead_write: lock");
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}
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return EIO;
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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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int
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dead_ioctl(struct vnop_ioctl_args *ap)
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{
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if (!chkvnlock(ap->a_vp)) {
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return EBADF;
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}
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return VCALL(ap->a_vp, VOFFSET(vnop_ioctl), ap);
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}
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/* ARGSUSED */
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int
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dead_select(__unused struct vnop_select_args *ap)
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{
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/*
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* Let the user find out that the descriptor is gone.
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*/
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return 1;
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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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int
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dead_strategy(struct vnop_strategy_args *ap)
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{
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vnode_t vp = buf_vnop_vnode(ap->a_bp);
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if (!vp || !chkvnlock(vp)) {
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if (vp) {
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vnode_lock(vp);
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if (!(vp->v_lflag & VL_DEAD) || vp->v_op != dead_vnodeop_p) {
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#if DEVELOPMENT || DEBUG
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panic("%s: vnode %p (v_lflag 0x%x) is NOT in dead state",
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__func__, vp, vp->v_lflag);
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#else
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printf("%s: vnode %p (v_lflag 0x%x) is NOT in dead state",
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__func__, vp, vp->v_lflag);
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#endif
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}
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vnode_unlock(vp);
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printf("%s: returning EIO for vnode v_flags = 0x%x v_numoutput = %d\n",
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__func__, vp->v_flag, vp->v_numoutput);
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}
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buf_seterror(ap->a_bp, EIO);
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buf_biodone(ap->a_bp);
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return EIO;
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}
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printf("%s: vnode is going to call the original bwrite routine v_lflag 0x%x v_flags = 0x%x v_numoutput = %d\n",
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__func__, vp->v_lflag, vp->v_flag, vp->v_numoutput);
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return VOCALL(vp->v_op, VOFFSET(vnop_strategy), ap);
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}
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/*
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* Return an error and complete the IO if the vnode is not changing state.
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*/
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int
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dead_bwrite(struct vnop_bwrite_args *ap)
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{
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buf_t bp = ap->a_bp;
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vnode_t vp = buf_vnop_vnode(bp);
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if (!vp || !chkvnlock(vp)) {
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vnode_t buf_vp = buf_vnode(bp);
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if (vp) {
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vnode_lock(vp);
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if (!(vp->v_lflag & VL_DEAD) || vp->v_op != dead_vnodeop_p) {
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#if DEVELOPMENT || DEBUG
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panic("%s: vnode %p (v_lflag 0x%x) is NOT in dead state",
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__func__, vp, vp->v_lflag);
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#else
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printf("%s: vnode %p (v_lflag 0x%x) is NOT in dead state",
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__func__, vp, vp->v_lflag);
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#endif
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}
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vnode_unlock(vp);
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}
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buf_seterror(bp, EIO);
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if (buf_vp) {
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/*
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* buf_biodone is expecting this to be incremented (see buf_bwrite)
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*/
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OSAddAtomic(1, &buf_vp->v_numoutput);
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printf("%s: returning EIO for vnode v_flags = 0x%x v_numoutput = %d\n",
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__func__, buf_vp->v_flag, buf_vp->v_numoutput);
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}
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buf_biodone(bp);
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return EIO;
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}
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printf("%s: vnode is going to call the original bwrite routine v_lflag 0x%x v_flags = 0x%x v_numoutput = %d\n",
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__func__, vp->v_lflag, vp->v_flag, vp->v_numoutput);
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return VOCALL(vp->v_op, VOFFSET(vnop_bwrite), ap);
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}
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/*
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* Wait until the vnode has finished changing state.
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*/
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int
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dead_blockmap(struct vnop_blockmap_args *ap)
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{
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if (!chkvnlock(ap->a_vp)) {
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return EIO;
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}
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return VNOP_BLOCKMAP(ap->a_vp, ap->a_foffset, ap->a_size, ap->a_bpn,
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ap->a_run, ap->a_poff, ap->a_flags, ap->a_context);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Empty vnode failed operation
|
||
|
|
*/
|
||
|
|
/* ARGSUSED */
|
||
|
|
int
|
||
|
|
dead_ebadf(__unused void *dummy)
|
||
|
|
{
|
||
|
|
return EBADF;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Empty vnode bad operation
|
||
|
|
*/
|
||
|
|
/* ARGSUSED */
|
||
|
|
int
|
||
|
|
dead_badop(__unused void *dummy)
|
||
|
|
{
|
||
|
|
panic("dead_badop called");
|
||
|
|
/* NOTREACHED */
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* We have to wait during times when the vnode is
|
||
|
|
* in a state of change.
|
||
|
|
*/
|
||
|
|
int
|
||
|
|
chkvnlock(vnode_t vp)
|
||
|
|
{
|
||
|
|
vnode_lock(vp);
|
||
|
|
if (!(vp->v_lflag & VL_OPSCHANGE)) {
|
||
|
|
vnode_unlock(vp);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
while (vp->v_lflag & VL_DEAD) {
|
||
|
|
msleep(&vp->v_lflag, &vp->v_lock, PVFS, "chkvnlock", NULL);
|
||
|
|
}
|
||
|
|
vnode_unlock(vp);
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/* Blktooff */
|
||
|
|
int
|
||
|
|
dead_blktooff(struct vnop_blktooff_args *ap)
|
||
|
|
{
|
||
|
|
if (!chkvnlock(ap->a_vp)) {
|
||
|
|
return EIO;
|
||
|
|
}
|
||
|
|
|
||
|
|
*ap->a_offset = (off_t)-1; /* failure */
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
/* Blktooff */
|
||
|
|
int
|
||
|
|
dead_offtoblk(struct vnop_offtoblk_args *ap)
|
||
|
|
{
|
||
|
|
if (!chkvnlock(ap->a_vp)) {
|
||
|
|
return EIO;
|
||
|
|
}
|
||
|
|
|
||
|
|
*ap->a_lblkno = (daddr64_t)-1; /* failure */
|
||
|
|
return 0;
|
||
|
|
}
|