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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 <farman@linux.vnet.ibm.com>
Message-Id: <20170120162527.66075-4-farman@linux.vnet.ibm.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Eric Farman 2017-01-20 17:25:27 +01:00 committed by Paolo Bonzini
parent 482652502e
commit c4c41a0a65
1 changed files with 1 additions and 1 deletions
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2
block/file-posix.c
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@ -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);