From: Antoine Damhet <antoine.dam...@blade-group.com> The `detect-zeroes=unmap` option may issue unaligned `FALLOC_FL_PUNCH_HOLE` requests, raw block devices can (and will) return `EINVAL`, qemu should then write the zeroes to the blockdev instead of issuing an `IO_ERROR`.
The problem can be reprodced like this: $ qemu-io -c 'write -P 0 42 1234' --image-opts driver=host_device,filename=/dev/loop0,detect-zeroes=unmap write failed: Invalid argument Signed-off-by: Antoine Damhet <antoine.dam...@blade-group.com> Message-Id: <20200717135603.51180-1-antoine.dam...@blade-group.com> Signed-off-by: Kevin Wolf <kw...@redhat.com> --- block/file-posix.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/block/file-posix.c b/block/file-posix.c index 8cc39a1ef6..9a00d4190a 100644 --- a/block/file-posix.c +++ b/block/file-posix.c @@ -1698,7 +1698,11 @@ static int handle_aiocb_write_zeroes_unmap(void *opaque) #ifdef CONFIG_FALLOCATE_PUNCH_HOLE int ret = do_fallocate(s->fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, aiocb->aio_offset, aiocb->aio_nbytes); - if (ret != -ENOTSUP) { + switch (ret) { + case -ENOTSUP: + case -EINVAL: + break; + default: return ret; } #endif -- 2.25.4