Hi I have noticed that host folder sharing via USB has recently stopped
working. After doing some git bisecting I found this as the patch that seems to
be the issue:
25f78d9e2de528473d52acfcf7acdfb64e3453d4 is the first bad commit
commit 25f78d9e2de528473d52acfcf7acdfb64e3453d4
Author: Vladimir Sementsov-Ogievskiy <vsement...@virtuozzo.com>
Date: Thu Jun 10 15:05:34 2021 +0300
block: move supports_backing check to bdrv_set_file_or_backing_noperm()
Move supports_backing check of bdrv_reopen_parse_backing to called
(through bdrv_set_backing_noperm()) bdrv_set_file_or_backing_noperm()
function. The check applies to general case, so it's appropriate for
bdrv_set_file_or_backing_noperm().
We have to declare backing support for two test drivers, otherwise new
check fails.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsement...@virtuozzo.com>
Message-Id: <20210610120537.196183-7-vsement...@virtuozzo.com>
Signed-off-by: Kevin Wolf <kw...@redhat.com>
block.c | 29 +++++++++++++++--------------
tests/unit/test-bdrv-drain.c | 1 +
tests/unit/test-bdrv-graph-mod.c | 1 +
3 files changed, 17 insertions(+), 14 deletions(-)
To reproduce this issue run this command:
qemu-system-i386 -usb -device usb-storage,drive=fat16 -drive
file=fat:rw:fat-type=16:"<path to host folder>",id=fat16,format=raw,if=none
Results:
Unexpected error in bdrv_set_file_or_backing_noperm() at ../block.c:3159:
qemu-system-i386: -drive file=fat:rw:fat-type=16:<host folder
path>,id=fat16,format=raw,if=none: Driver 'vvfat' of node '#block057' does not
support backing files
Abort trap: 6
Expected results:
QEMU start running normally.
Please let me know if you need more information.
Thank you.
