diff mbox

[v3,3/3] block: get max_transfer limit for char (scsi-generic) devices

Message ID 20170120162527.66075-4-farman@linux.vnet.ibm.com (mailing list archive)
State New, archived
Headers show

Commit Message

Eric Farman Jan. 20, 2017, 4:25 p.m. UTC 
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>
---
 block/file-posix.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox

Patch

diff --git a/block/file-posix.c b/block/file-posix.c
index 9f83725..2134e0e 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);