The 'from' and 'len' field of struct
nbd_request tell us the block number
and data length of what data is being transferred, right?
Here are my questions:
1. Does the block number given by 'from' refer to the
block number in the
disk image file on remote server, not in
local main memory?
2. If the answer of question 1 is positive,
where do those data (data blocks
from
$from to $from + $len in remote disk image file) go when the
request
type is 'read'? Where are they saved? In local main
memory? Or on local disk?
How can I get them and save them in
some other place specified by myself?
3. In kernel source file
nbd.c, the function sock_xmit() is used to send or receive
packet. There is a variable named 'iov' which contains 'void *iov_base'
and
'size_t iov_len'. Whatever read or write, 'iov' is always
used. Is it used to
represent a segment (or a data block) in
local main memory? What does it mean
when the request type is
read or write respectively?
Thanks a lot!
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