nfsd4: allow encoding across page boundaries
After this we can handle for example getattr of very large ACLs.
Read, readdir, readlink are still special cases with their own limits.
Also we can't handle a new operation starting close to the end of a
page.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 3ce431b..5d8f915 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1264,6 +1264,10 @@
xdr->end = head->iov_base + PAGE_SIZE - 2 * RPC_MAX_AUTH_SIZE;
/* Tail and page_len should be zero at this point: */
buf->len = buf->head[0].iov_len;
+ xdr->scratch.iov_len = 0;
+ xdr->page_ptr = buf->pages;
+ buf->buflen = PAGE_SIZE * (1 + rqstp->rq_page_end - buf->pages)
+ - 2 * RPC_MAX_AUTH_SIZE;
}
/*