[Qemu-devel] [PATCH] Raise 9pfs mount_tag limit from 32 to 255 bytes

[Daniel P. Berrange]

From: "Daniel P. Berrange" <address@hidden>

The Linux guest kernel does not appear to have a problem handling
a mount_tag larger than 32 bytes. Increase the limit to 255 bytes,
though perhaps it can be made larger still, or not limited at all ?

Tested with a 3.0.4 kernel and a mount_tag 255 bytes in length.

* hw/9pfs/virtio-9p.h: Change MAX_TAG_LEN to 255

Signed-off-by: Daniel P. Berrange <address@hidden>
---
 hw/9pfs/virtio-9p.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/hw/9pfs/virtio-9p.h b/hw/9pfs/virtio-9p.h
index 17d44b4..b133b33 100644
--- a/hw/9pfs/virtio-9p.h
+++ b/hw/9pfs/virtio-9p.h
@@ -144,7 +144,7 @@ struct V9fsPDU
 /* The ID for virtio console */
 #define VIRTIO_ID_9P    9
 #define MAX_REQ         128
-#define MAX_TAG_LEN     32
+#define MAX_TAG_LEN     255
 
 #define BUG_ON(cond) assert(!(cond))
 
-- 
1.7.6.2