From c4c41a0a65d650b241dec9efedf4ee3f00a16a30 Mon Sep 17 00:00:00 2001 From: Eric Farman Date: Fri, 20 Jan 2017 17:25:27 +0100 Subject: [PATCH] block: get max_transfer limit for char (scsi-generic) devices We can get the maximum number of bytes for a single I/O transfer from the BLKSECTGET ioctl, but we only perform this for block devices. scsi-generic devices are represented as character devices, and so do not issue this today. Update this, so that virtio-scsi devices using the scsi-generic interface can return the same data. Signed-off-by: Eric Farman Message-Id: <20170120162527.66075-4-farman@linux.vnet.ibm.com> Reviewed-by: Fam Zheng Signed-off-by: Paolo Bonzini --- block/file-posix.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/block/file-posix.c b/block/file-posix.c index 9f83725fc4..2134e0ef96 100644 --- a/block/file-posix.c +++ b/block/file-posix.c @@ -674,7 +674,7 @@ static void raw_refresh_limits(BlockDriverState *bs, Error **errp) struct stat st; if (!fstat(s->fd, &st)) { - if (S_ISBLK(st.st_mode)) { + if (S_ISBLK(st.st_mode) || S_ISCHR(st.st_mode)) { int ret = hdev_get_max_transfer_length(bs, s->fd); if (ret > 0 && ret <= BDRV_REQUEST_MAX_BYTES) { bs->bl.max_transfer = pow2floor(ret);