7291294314
Fix a regression introduced by fix for Illumos bug #3834. Quote from Matthew Ahrens on the Illumos issue: ztest fails this assertion because ztest_dmu_read_write() does dmu_tx_hold_free(tx, bigobj, bigoff, bigsize); and then dmu_object_set_checksum(os, bigobj, (enum zio_checksum)ztest_random_dsl_prop(ZFS_PROP_CHECKSUM), tx); If the region to free is past the end of the file, the DMU assumes that there will be nothing to do for this object. However, ztest does set_checksum(), which must modify the dnode. The fix is for ztest to also call dmu_tx_hold_bonus(tx, bigobj); so we can account for the dirty data associated with setting the checksum Illumos ZFS issues: 3955 ztest failure: assertion refcount_count(&tx->tx_space_written) + delta <= tx->tx_space_towrite
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