Assume starting one disk write action, the vdev_disk_io_start will be called
from zio_execute.
static int vdev_disk_io_start(zio_t *zio)
{
......
bp->b_lblkno = lbtodb(zio->io_offset);
......
}
After scaning over the zfs source, I find the zio->io_offset is only set value
in zio_create by the parameter offset.
zio_write calls zio_create with the value 0 for the parameter offset. I can't
find anywhere else the zio->io_offset being set.
After the new block born, the correct offset has been filled in bp->blk_dva
(see metaslab_alloc), when and where the correct value set to zio->io_offset?
Who can tell me?
thanks
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