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Fix zio_taskq_dispatch to use TQ_NOSLEEP

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The zio_taskq_dispatch() function may be called at interrupt time
and it is critical that we never sleep.

Additionally, wrap taskq_dispatch() in a while loop because it may
fail.  This is non optimal but is OK for now.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Brian Behlendorf 2010-08-26 10:32:23 -07:00
parent 2a442d1629
commit 5cc556b447
1 changed files with 4 additions and 3 deletions
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7
module/zfs/zio.c
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@ -1049,7 +1049,7 @@ zio_taskq_dispatch(zio_t *zio, enum zio_taskq_type q, boolean_t cutinline)
{
spa_t *spa = zio->io_spa;
zio_type_t t = zio->io_type;
int flags = TQ_SLEEP | (cutinline ? TQ_FRONT : 0);
int flags = TQ_NOSLEEP | (cutinline ? TQ_FRONT : 0);
/*
* If we're a config writer or a probe, the normal issue and
@ -1073,8 +1073,9 @@ zio_taskq_dispatch(zio_t *zio, enum zio_taskq_type q, boolean_t cutinline)
q++;
ASSERT3U(q, <, ZIO_TASKQ_TYPES);
(void) taskq_dispatch(spa->spa_zio_taskq[t][q],
(task_func_t *)zio_execute, zio, flags);
while (taskq_dispatch(spa->spa_zio_taskq[t][q],
(task_func_t *)zio_execute, zio, flags) == 0); /* do nothing */
}
static boolean_t