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lockrange: Avoid a race condition which was causing random corruption,

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panics and hangs in RAID-5 plexes, particularly with ata drives.

Original-code-by:   Bernd Walter <ticso@cicely.de>
Eagerly-awaited-by: sos
This commit is contained in:
Greg Lehey 2000-05-04 07:37:11 +00:00
parent 46aebdeaea
commit 9702452a12
1 changed files with 5 additions and 6 deletions
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11
sys/dev/vinum/vinumlock.c
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@ -37,7 +37,7 @@
* otherwise) arising in any way out of the use of this software, even if
* advised of the possibility of such damage.
*
* $Id: vinumlock.c,v 1.11 1999/10/12 04:35:37 grog Exp grog $
* $Id: vinumlock.c,v 1.12 2000/01/05 22:17:25 grog Exp grog $
* $FreeBSD$
*/
@ -248,14 +248,13 @@ lockrange(daddr_t stripe, struct buf *bp, struct plex *plex)
}
#endif
plex->lockwaits++; /* waited one more time */
while (lock->stripe) /* wait for it to become free */
tsleep((void *) lock->stripe, PRIBIO, "vrlock", 2 * hz);
break; /* out of the inner level loop */
lock = plex->lock; /* start again */
foundlocks = 0;
pos = NULL;
}
} else {
if (pos == NULL) /* still looking for somewhere? */
} else if (pos == NULL) /* still looking for somewhere? */
pos = lock; /* a place to put this one */
}
}
/*