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RPC: add wrapper for svc_reserve to account for checksum

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When the kernel calls svc_reserve to downsize the expected size of an RPC
reply, it fails to account for the possibility of a checksum at the end of
the packet.  If a client mounts a NFSv2/3 with sec=krb5i/p, and does I/O
then you'll generally see messages similar to this in the server's ring
buffer:

RPC request reserved 164 but used 208

While I was never able to verify it, I suspect that this problem is also
the root cause of some oopses I've seen under these conditions:

https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=227726

This is probably also a problem for other sec= types and for NFSv4.  The
large reserved size for NFSv4 compound packets seems to generally paper
over the problem, however.

This patch adds a wrapper for svc_reserve that accounts for the possibility
of a checksum.  It also fixes up the appropriate callers of svc_reserve to
call the wrapper.  For now, it just uses a hardcoded value that I
determined via testing.  That value may need to be revised upward as things
change, or we may want to eventually add a new auth_op that attempts to
calculate this somehow.

Unfortunately, there doesn't seem to be a good way to reliably determine
the expected checksum length prior to actually calculating it, particularly
with schemes like spkm3.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Acked-by: Neil Brown <neilb@suse.de>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Acked-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jeff Layton
2007-05-09 02:34:50 -07:00
committed by Linus Torvalds
parent 6697164335
commit cd123012d9
4 changed files with 22 additions and 3 deletions
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19
include/linux/sunrpc/svc.h
View File

@@ -396,4 +396,23 @@ char * svc_print_addr(struct svc_rqst *, char *, size_t);
#define RPC_MAX_ADDRBUFLEN (63U)
/*
* When we want to reduce the size of the reserved space in the response
* buffer, we need to take into account the size of any checksum data that
* may be at the end of the packet. This is difficult to determine exactly
* for all cases without actually generating the checksum, so we just use a
* static value.
*/
static inline void
svc_reserve_auth(struct svc_rqst *rqstp, int space)
{
int added_space = 0;
switch(rqstp->rq_authop->flavour) {
case RPC_AUTH_GSS:
added_space = RPC_MAX_AUTH_SIZE;
}
return svc_reserve(rqstp, space + added_space);
}
#endif /* SUNRPC_SVC_H */