The function gfs_pio_sync copies data on
memory of the gf, and waits for the I/O
to complete before returning. It also updates metadtata stat
information, while another function
gfs_pio_datasync does not update the
metadata.
RETURN VALUES
NULL
The function terminated successfully.
GFARM_ERR_NO_MEMORY
Insufficient memory was available.
Others
An error except the above occurred. The reason is shown by its
pointed strings.