scsi_debug/tlibio/lio_[read,write]_buffer: Always return total amount of read/written bytes

[finist0]

Sometimes we got failures like:

growfiles(gf217): 65884 growfiles.c/2262: 104203 tlibio.c/744 write(3, buf, 5000) returned=2288 growfiles(gf217): 65884 growfiles.c/1765: 104203 Hit max errors value of 1 gf217 1 TFAIL : growfiles.c:134: Test failed

Which looked strange as partial write is something usual and valid. It turned out that lio_write_buffer() has the code cycle writes in case of a partial write happens, but it anyway returns the amount of bytes written by the LAST write.

And upper growfile() consider the returned amount from lio_write_buffer() to be less than it tried to write and fails the testcase.

Fix lio_write_buffer() to always return total bytes written, even in case partial writes.

Similar for lio_read_buffer() , it needs to return total amount of read bytes in case of partial reads.

Signed-off-by: Konstantin Khorenko khorenko@virtuozzo.com

[finist0]

Just noted you prefer emails, so do i, i have sent: https://lists.linux.it/pipermail/ltp/2023-May/033915.html https://lists.linux.it/pipermail/ltp/2023-May/033916.html

Please, feel free to close this pull request.

Thank you.