[stgt] [PATCH] Add support for COMPAREANDWRITE opcode

[ronnie sahlberg]

Tomo,

Please find attached a patch that adds support for the COMPARE_AND_WRITE opcode.


I also have test for this opcode in libiscsi :


iscsi-test --dataloss --test="*compareandwrite*"
iscsi://127.0.0.1/iqn.ronnie.test/1
0340_compareandwrite_simple:
===================
Compare and write first 1-255 blocks ... [OK]
Compare and write last 1-255 blocks ... [OK]
TEST T0340_compareandwrite_simple [OK]

0341_compareandwrite_mismatch:
===================
Compare and write first 1-255 blocks (data is not matching) ... [OK]
Compare and write last 1-255 blocks (data is not matching) ... [OK]
TEST T0341_compareandwrite_mismatch [OK]

0343_compareandwrite_beyond_eol:
=======================
Writing 1-255 blocks with one block beyond end-of-device ... [OK]
Writing 1-255 blocks at LBA 2^63 ... [OK]
Writing 1-255 blocks at LBA -1 ... [OK]
Writing 1-255 blocks beyond eol starting at last block ... [OK]
TEST T0343_compareandwrite_beyondeol [OK]
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