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nfsd4: better reservation of head space for krb5

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RPC_MAX_AUTH_SIZE is scattered around several places.  Better to set it
once in the auth code, where this kind of estimate should be made.  And
while we're at it we can leave it zero when we're not using krb5i or
krb5p.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
J. Bruce Fields
2014-05-12 18:10:58 -04:00
parent d05d5744ef
commit a5cddc885b
6 changed files with 15 additions and 11 deletions
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5
fs/nfsd/nfs4xdr.c
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@@ -1611,7 +1611,8 @@ nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
DECODE_HEAD;
struct nfsd4_op *op;
bool cachethis = false;
int max_reply = 2 * RPC_MAX_AUTH_SIZE + 8; /* opcnt, status */
int auth_slack= argp->rqstp->rq_auth_slack;
int max_reply = auth_slack + 8; /* opcnt, status */
int readcount = 0;
int readbytes = 0;
int i;
@@ -1677,7 +1678,7 @@ nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
svc_reserve(argp->rqstp, max_reply + readbytes);
argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
if (readcount > 1 || max_reply > PAGE_SIZE - 2*RPC_MAX_AUTH_SIZE)
if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
argp->rqstp->rq_splice_ok = false;
DECODE_TAIL;