to write and flush operations on optionally different write_device with
optionally different sector offset
-9: same as 6 arguments plus define flush_offset and flush_delay explicitely
+9: same as 6 arguments plus define flush_offset and flush_delay explicitly
on/with optionally different flush_device/flush_offset.
Offsets are specified in sectors.
All storage within vdo is managed as 4KB blocks, but it can accept writes
as small as 512 bytes. Processing a write that is smaller than 4K requires
a read-modify-write operation that reads the relevant 4K block, copies the
-new data over the approriate sectors of the block, and then launches a
+new data over the appropriate sectors of the block, and then launches a
write operation for the modified data block. The read and write stages of
this operation are nearly identical to the normal read and write
operations, and a single data_vio is used throughout this operation.