360 lines
9.2 KiB
C
360 lines
9.2 KiB
C
/*
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* worm: Write Once device driver
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*
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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: worm.c,v 1.5 1995/05/03 23:38:20 gpalmer Exp $
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*/
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/* XXX This is PRELIMINARY.
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*
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* We need the "kern devconf" stuff, but I'm not
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* going to add it until it is done in a simple way that provides
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* base behavior in scsi_driver.c
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*
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* Until Bruce finishes the slice stuff there will be no partitions.
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* When it is finished I hope to hoist the partition code up into
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* "scsi_driver" and use common code for all devices.
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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/buf.h>
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#include <sys/proc.h>
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#include <scsi/scsi_all.h>
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#include <scsi/scsiconf.h>
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#include <scsi/scsi_disk.h>
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struct scsi_data {
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struct buf *buf_queue; /* the queue of pending IO operations */
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u_int32 n_blks; /* Number of blocks (0 for bogus) */
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u_int32 blk_size; /* Size of each blocks */
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};
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void wormstart(u_int32 unit, u_int32 flags);
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errval worm_open(dev_t dev, int flags, int fmt, struct proc *p,
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struct scsi_link *sc_link);
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errval worm_ioctl(dev_t dev, int cmd, caddr_t addr, int flag,
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struct proc *p, struct scsi_link *sc_link);
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errval worm_close(dev_t dev, int flag, int fmt, struct proc *p,
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struct scsi_link *sc_link);
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void worm_strategy(struct buf *bp, struct scsi_link *sc_link);
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SCSI_DEVICE_ENTRIES(worm)
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struct scsi_device worm_switch =
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{
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NULL,
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wormstart, /* we have a queue, and this is how we service it */
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NULL,
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NULL,
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"worm",
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0,
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{0, 0},
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SDEV_ONCE_ONLY, /* Only one open allowed */
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wormattach,
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"Write-Once",
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wormopen,
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sizeof(struct scsi_data),
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T_WORM,
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0,
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0,
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worm_open,
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0,
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worm_close,
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worm_strategy,
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};
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static int worm_size(struct scsi_link *sc_link)
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{
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int ret;
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struct scsi_data *worm = sc_link->sd;
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worm->n_blks = scsi_read_capacity(sc_link, &worm->blk_size,
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SCSI_NOSLEEP | SCSI_NOMASK);
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if (worm->n_blks)
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{
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sc_link->flags |= SDEV_MEDIA_LOADED;
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ret = 1;
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}
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else
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{
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sc_link->flags &= ~SDEV_MEDIA_LOADED;
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ret = 0;
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}
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return ret;
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}
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errval
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wormattach(struct scsi_link *sc_link)
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{
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struct scsi_data *worm = sc_link->sd;
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printf("- UNTESTED ");
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if (worm_size(sc_link) == 0)
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printf("- can't get capacity.");
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else
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printf("with %ld %ld byte blocks.", worm->n_blks, worm->blk_size);
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return 0;
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}
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/*
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* wormstart looks to see if there is a buf waiting for the device
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* and that the device is not already busy. If both are true,
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* It dequeues the buf and creates a scsi command to perform the
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* transfer required. The transfer request will call scsi_done
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* on completion, which will in turn call this routine again
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* so that the next queued transfer is performed.
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* The bufs are queued by the strategy routine (wormstrategy)
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*
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* This routine is also called after other non-queued requests
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* have been made of the scsi driver, to ensure that the queue
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* continues to be drained.
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* wormstart() is called at splbio
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*
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* XXX It looks like we need a "scsistart" to hoist common code up
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* into. In particular, the removable media checking should be
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* handled in one place.
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*/
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void
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wormstart(unit, flags)
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u_int32 unit;
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u_int32 flags;
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{
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struct scsi_link *sc_link = SCSI_LINK(&worm_switch, unit);
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struct scsi_data *worm = sc_link->sd;
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register struct buf *bp = 0;
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struct
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{
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u_char op_code;
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u_char byte2;
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u_char lba3; /* I don't want to worry about packing */
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u_char lba2;
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u_char lba1;
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u_char lba0;
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u_char reserved;
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u_char tl1;
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u_char tl0;
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u_char ctl;
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} cmd;
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u_int32 lba; /* Logical block address */
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u_int32 tl; /* Transfer length */
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SC_DEBUG(sc_link, SDEV_DB2, ("wormstart "));
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/*
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* We should reject all queued entries if SDEV_MEDIA_LOADED is not true.
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*/
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if (!(sc_link->flags & SDEV_MEDIA_LOADED)) {
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goto badnews; /* no I/O.. media changed or something */
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}
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/*
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* See if there is a buf to do and we are not already
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* doing one
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*/
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while (sc_link->opennings != 0) {
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/* if a special awaits, let it proceed first */
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if (sc_link->flags & SDEV_WAITING) {
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sc_link->flags &= ~SDEV_WAITING;
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wakeup(sc_link);
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return;
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}
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if ((bp = worm->buf_queue) == NULL) {
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return; /* no work to bother with */
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}
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worm->buf_queue = bp->b_actf;
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/*
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* Fill out the scsi command
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*/
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bzero(&cmd, sizeof(cmd));
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if ((bp->b_flags & B_READ) == B_WRITE) {
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cmd.op_code = WRITE_BIG;
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flags |= SCSI_DATA_OUT;
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} else {
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cmd.op_code = READ_BIG;
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flags |= SCSI_DATA_IN;
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}
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lba = bp->b_blkno / (worm->blk_size / DEV_BSIZE);
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tl = bp->b_bcount / worm->blk_size;
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scsi_uto4b(lba, &cmd.lba3);
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scsi_uto2b(tl, &cmd.tl1);
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/*
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* go ask the adapter to do all this for us
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*/
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if (scsi_scsi_cmd(sc_link,
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(struct scsi_generic *) &cmd,
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sizeof(cmd),
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(u_char *) bp->b_un.b_addr,
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bp->b_bcount,
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0, /* can't retry a read on a tape really */
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100000,
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bp,
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flags | SCSI_NOSLEEP) == SUCCESSFULLY_QUEUED) {
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} else {
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badnews:
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printf("worm%ld: oops not queued\n", unit);
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bp->b_flags |= B_ERROR;
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bp->b_error = EIO;
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biodone(bp);
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}
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} /* go back and see if we can cram more work in.. */
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}
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void
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worm_strategy(struct buf *bp, struct scsi_link *sc_link)
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{
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struct buf **dp;
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unsigned char unit;
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u_int32 opri;
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struct scsi_data *worm;
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unit = minor((bp->b_dev));
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worm = sc_link->sd;
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/* XXX: Can't we move this check up to "scsi_strategy"?
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*/
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if (!(sc_link->flags & SDEV_MEDIA_LOADED) ||
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bp->b_blkno > worm->n_blks ||
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bp->b_bcount & (worm->blk_size - 1)) {
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bp->b_error = EIO;
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bp->b_flags |= B_ERROR;
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biodone(bp);
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return;
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}
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opri = splbio();
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/*
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* Use a bounce buffer if necessary
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* XXX: How can we move this up?
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*/
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#ifdef BOUNCE_BUFFERS
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if (sc_link->flags & SDEV_BOUNCE)
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vm_bounce_alloc(bp);
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#endif
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/*
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* Place it in the queue of activities for this device
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* at the end.
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*/
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dp = &(worm->buf_queue);
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while (*dp) {
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dp = &((*dp)->b_actf);
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}
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*dp = bp;
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bp->b_actf = NULL;
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wormstart(unit, 0);
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splx(opri);
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return;
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}
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/*
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* Open the device. XXX: I'm completely guessing at this sequence.
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*/
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int
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worm_open(dev_t dev, int flags, int fmt, struct proc *p,
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struct scsi_link *sc_link)
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{
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if (sc_link->flags & SDEV_OPEN)
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return EBUSY;
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/*
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* Check that it is still responding and ok.
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* if the media has been changed this will result in a
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* "unit attention" error which the error code will
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* disregard because the SDEV_OPEN flag is not yet set
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*
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* XXX This should REALLY be hoisted up. As soon as Bruce
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* finishes that slice stuff. (Add a different flag,
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* and then do a "scsi_test_unit_ready" with the "ignore
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* unit attention" thing set. Then all this replicated
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* test unit ready code can be pulled up.
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*/
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scsi_test_unit_ready(sc_link, SCSI_SILENT);
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/*
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* Next time actually take notice of error returns
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*/
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sc_link->flags |= SDEV_OPEN; /* unit attn errors are now errors */
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if (scsi_test_unit_ready(sc_link, SCSI_SILENT) != 0) {
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SC_DEBUG(sc_link, SDEV_DB3, ("not ready\n"));
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sc_link->flags &= ~SDEV_OPEN;
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return ENXIO;
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}
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scsi_start_unit(sc_link, SCSI_SILENT);
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scsi_prevent(sc_link, PR_PREVENT, SCSI_SILENT);
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if (worm_size(sc_link) == 0) {
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scsi_stop_unit(sc_link, 0, SCSI_SILENT);
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scsi_prevent(sc_link, PR_ALLOW, SCSI_SILENT);
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sc_link->flags &= ~SDEV_OPEN;
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return ENXIO;
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}
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return 0;
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}
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int
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worm_close(dev_t dev, int flag, int fmt, struct proc *p,
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struct scsi_link *sc_link)
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{
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scsi_stop_unit(sc_link, 0, SCSI_SILENT);
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scsi_prevent(sc_link, PR_ALLOW, SCSI_SILENT);
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sc_link->flags &= ~SDEV_OPEN;
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return 0;
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}
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