Commit 1fcea5b2 authored by J. Bruce Fields's avatar J. Bruce Fields
Browse files

nfsd4: use xdr_truncate_encode 



Now that lengths are reliable, we can use xdr_truncate instead of
open-coding it everywhere.

Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
parent 3e19ce76

fs/nfsd/nfs4xdr.c

+16 −20
Original line number Diff line number Diff line
@@ -2053,7 +2053,7 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp, 
	struct svc_fh *tempfh = NULL;

	struct kstatfs statfs;

	__be32 *p;

	__be32 *start = xdr->p;

	int starting_len = xdr->buf->len;

	__be32 *attrlenp;

	u32 dummy;

	u64 dummy64;
@@ -2547,13 +2547,8 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp, 
		fh_put(tempfh);

		kfree(tempfh);

	}

	if (status) {

		int nbytes = (char *)xdr->p - (char *)start;

		/* open code what *should* be xdr_truncate(xdr, len); */

		xdr->iov->iov_len -= nbytes;

		xdr->buf->len -= nbytes;

		xdr->p = start;

	}

	if (status)

		xdr_truncate_encode(xdr, starting_len);

	return status;

out_nfserr:

	status = nfserrno(err);
@@ -3008,6 +3003,7 @@ nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr, 
	struct page *page;

	unsigned long maxcount; 

	struct xdr_stream *xdr = &resp->xdr;

	int starting_len = xdr->buf->len;

	long len;

	__be32 *p;
@@ -3044,9 +3040,13 @@ nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr, 
			&maxcount);



	if (nfserr) {

		xdr->p -= 2;

		xdr->iov->iov_len -= 8;

		xdr->buf->len -= 8;

		/*

		 * nfsd_splice_actor may have already messed with the

		 * page length; reset it so as not to confuse

		 * xdr_truncate_encode:

		 */

		xdr->buf->page_len = 0;

		xdr_truncate_encode(xdr, starting_len);

		return nfserr;

	}

	eof = (read->rd_offset + maxcount >=
@@ -3079,6 +3079,7 @@ nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd 
	int maxcount;

	struct xdr_stream *xdr = &resp->xdr;

	char *page;

	int length_offset = xdr->buf->len;

	__be32 *p;



	if (nfserr)
@@ -3103,9 +3104,7 @@ nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd 
	if (nfserr == nfserr_isdir)

		nfserr = nfserr_inval;

	if (nfserr) {

		xdr->p--;

		xdr->iov->iov_len -= 4;

		xdr->buf->len -= 4;

		xdr_truncate_encode(xdr, length_offset);

		return nfserr;

	}
@@ -3134,7 +3133,8 @@ nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4 
	int maxcount;

	loff_t offset;

	struct xdr_stream *xdr = &resp->xdr;

	__be32 *page, *savep, *tailbase;

	int starting_len = xdr->buf->len;

	__be32 *page, *tailbase;

	__be32 *p;



	if (nfserr)
@@ -3145,7 +3145,6 @@ nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4 
		return nfserr_resource;



	RESERVE_SPACE(NFS4_VERIFIER_SIZE);

	savep = p;



	/* XXX: Following NFSv3, we ignore the READDIR verifier for now. */

	WRITE32(0);
@@ -3207,10 +3206,7 @@ nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4 


	return 0;

err_no_verf:

	xdr->p = savep;

	xdr->iov->iov_len = ((char *)resp->xdr.p)

				- (char *)resp->xdr.buf->head[0].iov_base;

	xdr->buf->len = xdr->iov->iov_len;

	xdr_truncate_encode(xdr, starting_len);

	return nfserr;

}