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fuse: document protocol version negotiation

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Clarify how the protocol version should be negotiated between kernel
and userspace.  Notably libfuse didn't correctly handle the case when
the supported major versions didn't match.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
This commit is contained in:
Miklos Szeredi 2009-07-08 18:17:58 +02:00
parent 7a6d3c8b30
commit 37d217f029
1 changed files with 20 additions and 0 deletions
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20
include/linux/fuse.h
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@ -41,6 +41,26 @@
#include <linux/types.h>
/*
* Version negotiation:
*
* Both the kernel and userspace send the version they support in the
* INIT request and reply respectively.
*
* If the major versions match then both shall use the smallest
* of the two minor versions for communication.
*
* If the kernel supports a larger major version, then userspace shall
* reply with the major version it supports, ignore the rest of the
* INIT message and expect a new INIT message from the kernel with a
* matching major version.
*
* If the library supports a larger major version, then it shall fall
* back to the major protocol version sent by the kernel for
* communication and reply with that major version (and an arbitrary
* supported minor version).
*/
/** Version number of this interface */
#define FUSE_KERNEL_VERSION 7