Switch KM_SLEEP to KM_PUSHPAGE

Prevent snapshot_check to initiate I/O during memory allocation.

Signed-off-by: Massimo Maggi <massimo@mmmm.it>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1023

diff --git a/module/zfs/dmu_objset.c b/module/zfs/dmu_objset.c
index c1bc1de7be2010d8b8f041dff860ed167da8f935..628b23be195a8ec8cbc419d82f7984113fa48d8f 100644 (file)
--- a/module/zfs/dmu_objset.c
+++ b/module/zfs/dmu_objset.c
@@ -848,7 +848,7 @@ snapshot_check(void *arg1, void *arg2, dmu_tx_t *tx)
                if (strlen(sn->htag) + MAX_TAG_PREFIX_LEN >= MAXNAMELEN)
                        return (E2BIG);
 
-               sn->ha = kmem_alloc(sizeof (struct dsl_ds_holdarg), KM_SLEEP);
+               sn->ha = kmem_alloc(sizeof(struct dsl_ds_holdarg), KM_PUSHPAGE);
                sn->ha->temphold = B_TRUE;
                sn->ha->htag = sn->htag;
        }