With discard_granularity set to alloc_size, we no longer get object
size alignment from blk_bio_discard_split().
This assumption is pretty deeply ingrained in krbd_data_pool.sh, so
make it explicit. For krbd_fallocate.sh, just fix the expectation.
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
The test case is issuing discards that span two objects: the tail of
the first object is truncated, the head of the second object is zeroed.
These discards aren't serial, so there is a race:
discard i ~ i + 1: truncate i, zero i + 1
discard i + 1 ~ i + 2: truncate i + 1, zero i + 2
can be executed as
truncate i + 1, zero i + 2, truncate i, zero i + 1
For object i + 1, the sequence ends up being truncate tail, then zero
head. This zero op is munged to truncate on the OSD, resulting in size
0 instead of OBJECT_SIZE / 2.
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
/bin/bash is a Linuxism. Other operating systems install bash to
different paths. Use /usr/bin/env in shebangs to find bash.
Signed-off-by: Alan Somers <asomers@gmail.com>
