447deba3da
size != 512 that are configured without a label. The bug should only
have effected swap-backed VN mounts without a label.
Add several major features to VN. In the kernel we add a swap
pre-reservation capability, which can be used to guarentee seek
consistency for swap-backed VN nodes. This also incidently allows
a swap-backed VN filesystem to be recovered after a crash in some
cases (if the same swap blocks happen to be reserved).
We also add a number of new options to vnconfig which do the work
of pre-zeroing or creating/truncating/extending a file which greatly
simplifies using VN in a file-backed configuration.
Add FreeBSD CVS label to sys/sys/vnioctl.h, as well as a new ioctl
flag for the swap pre-reservation feature.
Reviewed by: Alan Cox <alc@cs.rice.edu>, David Greenman <dg@root.com>
80 lines
3.3 KiB
C
80 lines
3.3 KiB
C
/*
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* Copyright (c) 1988 University of Utah.
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department.
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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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* from: Utah $Hdr: fdioctl.h 1.1 90/07/09$
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*
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* @(#)vnioctl.h 8.1 (Berkeley) 6/10/93
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*
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* $FreeBSD$
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*/
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#ifndef _SYS_VNIOCTL_H_
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#define _SYS_VNIOCTL_H_
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/*
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* Ioctl definitions for file (vnode) disk pseudo-device.
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*/
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#define _PATH_VNTAB "/etc/vntab" /* default config file */
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struct vn_ioctl {
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char *vn_file; /* pathname of file to mount */
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int vn_size; /* (returned) size of disk */
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};
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/*
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* Before you can use a unit, it must be configured with VNIOCSET.
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* The configuration persists across opens and closes of the device;
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* an VNIOCCLR must be used to reset a configuration. An attempt to
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* VNIOCSET an already active unit will return EBUSY.
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*/
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#define VNIOCATTACH _IOWR('F', 0, struct vn_ioctl) /* attach file */
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#define VNIOCDETACH _IOWR('F', 1, struct vn_ioctl) /* detach disk */
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#define VNIOCGSET _IOWR('F', 2, u_long ) /* set global option */
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#define VNIOCGCLEAR _IOWR('F', 3, u_long ) /* reset --//-- */
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#define VNIOCUSET _IOWR('F', 4, u_long ) /* set unit option */
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#define VNIOCUCLEAR _IOWR('F', 5, u_long ) /* reset --//-- */
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#define VN_LABELS 0x1 /* Use disk(/slice) labels */
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#define VN_FOLLOW 0x2 /* Debug flow in vn driver */
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#define VN_DEBUG 0x4 /* Debug data in vn driver */
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#define VN_IO 0x8 /* Debug I/O in vn driver */
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#define VN_DONTCLUSTER 0x10 /* Don't cluster */
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#define VN_RESERVE 0x20 /* Pre-reserve swap */
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#endif /* _SYS_VNIOCTL_H_*/
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