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gss_krb5: Added and improved code comments

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Signed-off-by: Steve Dickson <steved@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Kevin Coffman
2010-03-17 13:02:47 -04:00
committed by Trond Myklebust
parent 725f2865d4
commit 7561042fb7
3 changed files with 38 additions and 3 deletions
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15
net/sunrpc/auth_gss/svcauth_gss.c
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@ -1315,6 +1315,14 @@ svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp)
inpages = resbuf->pages;
/* XXX: Would be better to write some xdr helper functions for
* nfs{2,3,4}xdr.c that place the data right, instead of copying: */
/*
* If there is currently tail data, make sure there is
* room for the head, tail, and 2 * RPC_MAX_AUTH_SIZE in
* the page, and move the current tail data such that
* there is RPC_MAX_AUTH_SIZE slack space available in
* both the head and tail.
*/
if (resbuf->tail[0].iov_base) {
BUG_ON(resbuf->tail[0].iov_base >= resbuf->head[0].iov_base
+ PAGE_SIZE);
@ -1327,6 +1335,13 @@ svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp)
resbuf->tail[0].iov_len);
resbuf->tail[0].iov_base += RPC_MAX_AUTH_SIZE;
}
/*
* If there is no current tail data, make sure there is
* room for the head data, and 2 * RPC_MAX_AUTH_SIZE in the
* allotted page, and set up tail information such that there
* is RPC_MAX_AUTH_SIZE slack space available in both the
* head and tail.
*/
if (resbuf->tail[0].iov_base == NULL) {
if (resbuf->head[0].iov_len + 2*RPC_MAX_AUTH_SIZE > PAGE_SIZE)
return -ENOMEM;