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Hold SCL_VDEV when counting leaves

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A config lock should be held while vdev_count_leaves() walks the tree,
otherwise the pointers reference may become invalid during the walk.

SCL_VDEV is a minimal lock provided for such uses cases.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Signed-off-by: Olaf Faaland <faaland1@llnl.gov>
Closes #7286
This commit is contained in:
Olaf Faaland 2018-03-08 15:39:07 -08:00 committed by Brian Behlendorf
parent ebed90a598
commit 743253df70
1 changed files with 7 additions and 1 deletions
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8
module/zfs/vdev.c
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@ -209,7 +209,13 @@ vdev_count_leaves_impl(vdev_t *vd)
int
vdev_count_leaves(spa_t *spa)
{
return (vdev_count_leaves_impl(spa->spa_root_vdev));
int rc;
spa_config_enter(spa, SCL_VDEV, FTAG, RW_READER);
rc = vdev_count_leaves_impl(spa->spa_root_vdev);
spa_config_exit(spa, SCL_VDEV, FTAG);
return (rc);
}
void