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lockdrive: Add debug calls to catch occasional deadlocks on drives.

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The problem is probably gone, but the debug checks remain
	   for a while.
This commit is contained in:
Greg Lehey 1999-04-10 08:11:21 +00:00
parent cea0c59dfa
commit 7ffb59f668
1 changed files with 26 additions and 6 deletions
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32
sys/dev/vinum/vinumlock.c
View File

@ -20,7 +20,7 @@
* 4. Neither the name of the Company nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
*
* This software is provided ``as is'', and any express or implied
* warranties, including, but not limited to, the implied warranties of
* merchantability and fitness for a particular purpose are disclaimed.
@ -33,7 +33,7 @@
* 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 1.8 1999/01/14 02:52:13 grog Exp grog $
* $Id: vinumlock.c,v 1.9 1999/03/13 03:26:00 grog Exp grog $
*/
#define REALLYKERNEL
@ -43,21 +43,36 @@
/*
* Lock routines. Currently, we lock either an individual volume
* or the global configuration. I don't think tsleep and
* wakeup are SMP safe. FIXME XXX
* wakeup are SMP safe. FIXME XXX
*/
/* Lock a drive, wait if it's in use */
#if VINUMDEBUG
int
lockdrive(struct drive *drive, char *file, int line)
#else
int
lockdrive(struct drive *drive)
#endif
{
int error;
/* XXX get rid of drive->flags |= VF_LOCKING; */
if ((drive->flags & VF_LOCKED) /* it's locked */
&&(drive->pid == curproc->p_pid)) { /* by us! */
#ifdef VINUMDEBUG
log(LOG_WARNING,
"vinum lockdrive: already locking %s from %s:%d, called from %s:%d\n",
drive->label.name,
drive->lockfilename,
drive->lockline,
basename(file),
line);
#else
log(LOG_WARNING,
"vinum lockdrive: already locking %s\n",
drive->label.name);
#endif
return 0;
}
while ((drive->flags & VF_LOCKED) != 0) {
@ -66,7 +81,7 @@ lockdrive(struct drive *drive)
* since the drive structure can move, and the unlock
* function can be called after killing the drive.
* Solve this by waiting on this function; the number
* of conflicts is negligible
* of conflicts is negligible.
*/
if ((error = tsleep(&lockdrive,
PRIBIO | PCATCH,
@ -76,6 +91,11 @@ lockdrive(struct drive *drive)
}
drive->flags |= VF_LOCKED;
drive->pid = curproc->p_pid; /* it's a panic error if curproc is null */
#ifdef VINUMDEBUG
bcopy(basename(file), drive->lockfilename, 15);
drive->lockfilename[15] = '\0'; /* truncate if necessary */
drive->lockline = line;
#endif
return 0;
}
@ -100,7 +120,7 @@ lockvol(struct volume *vol)
* It would seem to make more sense to sleep on
* the address 'vol'. Unfortuntaly we can't
* guarantee that this address won't change due to
* table expansion. The address we choose won't change.
* table expansion. The address we choose won't change.
*/
if ((error = tsleep(&vinum_conf.volume + vol->devno,
PRIBIO | PCATCH,
@ -135,7 +155,7 @@ lockplex(struct plex *plex)
* It would seem to make more sense to sleep on
* the address 'plex'. Unfortunately we can't
* guarantee that this address won't change due to
* table expansion. The address we choose won't change.
* table expansion. The address we choose won't change.
*/
if ((error = tsleep(&vinum_conf.plex + plex->sdnos[0],
PRIBIO | PCATCH,