7a1d27b301
Change sd_open, sd_close and sd_ioctl to use this lock to ensure serialization of some critical operations, thus avoiding some race conditions. Ideas picked from NetBSD (ccd and sd devices). This fixes one of the problems noted in PR kern/3688. Reviewed by: "Justin T. Gibbs" <gibbs@plutotech.com>
66 lines
2.7 KiB
C
66 lines
2.7 KiB
C
/*
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* Copyright (C) 1995, HD Associates, Inc.
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* PO Box 276
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* Pepperell, MA 01463
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* 508 433 5266
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* dufault@hda.com
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*
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* This code is contributed to the University of California at Berkeley:
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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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* $Id: scsi_driver.h,v 1.11 1997/03/23 04:39:07 bde Exp $
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*
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*/
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#ifndef _SCSI__DRIVER_H_
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#define _SCSI__DRIVER_H_
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#ifdef KERNEL
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struct scsi_link;
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struct scsi_device;
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struct buf;
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struct proc;
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int scsi_goaway __P((int));
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int scsi_device_attach __P((struct scsi_link *));
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int scsi_device_lock __P((struct scsi_link *));
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void scsi_device_unlock __P((struct scsi_link *));
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int scsi_open __P((dev_t, int, int, struct proc *, struct scsi_device *));
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int scsi_close __P((dev_t, int, int, struct proc *, struct scsi_device *));
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int scsi_ioctl __P((dev_t, u_int32_t, caddr_t, int, struct proc *,
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struct scsi_device *));
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void scsi_strategy __P((struct buf *, struct scsi_device *));
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void scsi_minphys __P((struct buf *, struct scsi_device *));
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#endif /* KERNEL */
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#endif /* _SCSI__DRIVER_H_ */
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