From: Christian Schoenebeck <[email protected]>

Add a new callback 'msize_limit' to the V9fsTransport structure.

This allows each transport implementation to provide its theoretical
maximum 'msize' value, which will be used to cap the negotiated
msize during Tversion handshake.

Link: 
https://lore.kernel.org/qemu-devel/7c4e53eb73c0580d7a321dbf3823ba5647652298.1781287774.git.qemu_...@crudebyte.com
Signed-off-by: Christian Schoenebeck <[email protected]>
(cherry picked from commit a1c0e5a73740566d4b9eac1f97f78b8ce470116a)
Signed-off-by: Michael Tokarev <[email protected]>

diff --git a/hw/9pfs/9p.h b/hw/9pfs/9p.h
index b2df659b0e8..d8f364fafdb 100644
--- a/hw/9pfs/9p.h
+++ b/hw/9pfs/9p.h
@@ -481,6 +481,7 @@ struct V9fsTransport {
     void        (*init_out_iov_from_pdu)(V9fsPDU *pdu, struct iovec **piov,
                                          unsigned int *pniov, size_t size);
     void        (*push_and_notify)(V9fsPDU *pdu);
+    size_t      (*msize_limit)(V9fsState *s);
 };
 
 #endif
-- 
2.47.3


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