diff options
| author | Kevin Coffman <kwc@citi.umich.edu> | 2010-03-17 13:02:47 -0400 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2010-05-14 15:09:15 -0400 |
| commit | 7561042fb7870be0b4ee57efddce68bda8968abf (patch) | |
| tree | 8946703293d7904928f473f14f4e645f6d5be65a /net/sunrpc/auth_gss/auth_gss.c | |
| parent | 725f2865d4df31ac0768b13ae763beadc4bb8ce9 (diff) | |
gss_krb5: Added and improved code comments
Signed-off-by: Steve Dickson <steved@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'net/sunrpc/auth_gss/auth_gss.c')
| -rw-r--r-- | net/sunrpc/auth_gss/auth_gss.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c index 75602ece58eb..d64a58b8ed33 100644 --- a/net/sunrpc/auth_gss/auth_gss.c +++ b/net/sunrpc/auth_gss/auth_gss.c @@ -1316,15 +1316,21 @@ gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, inpages = snd_buf->pages + first; snd_buf->pages = rqstp->rq_enc_pages; snd_buf->page_base -= first << PAGE_CACHE_SHIFT; - /* Give the tail its own page, in case we need extra space in the - * head when wrapping: */ + /* + * Give the tail its own page, in case we need extra space in the + * head when wrapping: + * + * call_allocate() allocates twice the slack space required + * by the authentication flavor to rq_callsize. + * For GSS, slack is GSS_CRED_SLACK. + */ if (snd_buf->page_len || snd_buf->tail[0].iov_len) { tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); snd_buf->tail[0].iov_base = tmp; } maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); - /* RPC_SLACK_SPACE should prevent this ever happening: */ + /* slack space should prevent this ever happening: */ BUG_ON(snd_buf->len > snd_buf->buflen); status = -EIO; /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was |