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130 lines
4.8 KiB
C
130 lines
4.8 KiB
C
/*-
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* Copyright (c) 1997, 1998
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* Nan Yang Computer Services Limited. All rights reserved.
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*
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* This software is distributed under the so-called ``Berkeley
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* License'':
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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 Nan Yang Computer
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* Services Limited.
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* 4. Neither the name of the Company 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 ``as is'', and any express or implied
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* warranties, including, but not limited to, the implied warranties of
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* merchantability and fitness for a particular purpose are disclaimed.
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* In no event shall the company or contributors be liable for any
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* direct, indirect, incidental, special, exemplary, or consequential
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* damages (including, but not limited to, procurement of substitute
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* 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
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* in contract, strict liability, or tort (including negligence or
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* otherwise) arising in any way out of the use of this software, even if
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* advised of the possibility of such damage.
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*
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* $Id: revive.c,v 1.3 1998/11/02 04:10:19 grog Exp $
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*/
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#define REALLYKERNEL
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#include "vinumhdr.h"
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#include "request.h"
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/* revive a block of a plex. Return an error
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* indication. EAGAIN means successful copy, but
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* that more blocks remain to be copied.
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* XXX We should specify a block size here. At the moment,
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* just take a default value. FIXME */
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int
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revive_block(int plexno)
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{
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struct plex *plex = &PLEX[plexno];
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struct buf *bp;
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int error = EAGAIN;
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int size; /* size of revive block, bytes */
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int s; /* priority level */
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if (plex->revive_blocksize == 0) {
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if (plex->stripesize != 0) /* we're striped, don't revive more than */
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plex->revive_blocksize = min(DEFAULT_REVIVE_BLOCKSIZE, /* one block at a time */
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plex->stripesize << DEV_BSHIFT);
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else
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plex->revive_blocksize = DEFAULT_REVIVE_BLOCKSIZE;
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}
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size = min(plex->revive_blocksize, (plex->length - plex->revived) << DEV_BSHIFT);
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s = splbio();
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/* Get a buffer */
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bp = geteblk(size);
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if (bp == NULL) {
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splx(s);
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return ENOMEM;
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}
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if (bp->b_qindex != 0) /* on a queue, */
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bremfree(bp); /* remove it */
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splx(s);
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/* Amount to transfer: block size, unless it
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* would overlap the end */
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bp->b_bufsize = size;
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bp->b_bcount = bp->b_bufsize;
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bp->b_resid = 0x0;
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bp->b_blkno = plex->revived; /* we've got this far */
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/* XXX what about reviving anonymous plexes? */
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/* First, read the data from the volume. We don't
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* care which plex, that's bre's job */
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bp->b_dev = VINUMBDEV(plex->volno, 0, 0, VINUM_VOLUME_TYPE); /* create the device number */
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bp->b_flags = B_BUSY | B_READ;
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vinumstart(bp, 1);
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biowait(bp);
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if (bp->b_flags & B_ERROR)
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error = bp->b_error;
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else
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/* Now write to the plex */
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{
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s = splbio();
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if (bp->b_qindex != 0) /* on a queue, */
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bremfree(bp); /* remove it */
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splx(s);
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bp->b_dev = VINUMBDEV(plex->volno, plex->volplexno, 0, VINUM_PLEX_TYPE); /* create the device number */
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bp->b_flags = B_BUSY; /* make this a write */
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bp->b_resid = 0x0;
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vinumstart(bp, 1);
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biowait(bp);
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if (bp->b_flags & B_ERROR)
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error = bp->b_error;
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else {
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plex->revived += bp->b_bcount >> DEV_BSHIFT; /* moved this much further down */
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if (plex->revived >= plex->length) { /* finished */
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plex->revived = 0;
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plex->state = plex_up; /* do we need to do more? */
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if (plex->volno >= 0) /* we have a volume, */
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set_volume_state(plex->volno, volume_up, 0);
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printf("vinum: plex %s is %s\n", plex->name, plex_state(plex->state));
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save_config(); /* and save the updated configuration */
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error = 0; /* we're done */
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}
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}
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while (plex->waitlist) { /* we have waiting requests */
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launch_requests(plex->waitlist, 1); /* do them now */
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plex->waitlist = plex->waitlist->next; /* and move on to the next */
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}
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}
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if (bp->b_qindex == 0) /* not on a queue, */
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brelse(bp); /* is this kosher? */
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return error;
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}
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