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block/file-posix: do not fail on unlock bytes
bdrv_replace_child() calls bdrv_check_perm() with error_abort on loosening permissions. However file-locking operations may fail even in this case, for example on NFS. And this leads to Qemu crash. Let's avoid such errors. Note, that we ignore such things anyway on permission update commit and abort. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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