Commit 345b4159 authored by Chuck Lever's avatar Chuck Lever Committed by J. Bruce Fields
Browse files

lockd: Update the NLMv4 TEST arguments decoder to use struct xdr_stream 



Signed-off-by: default avatarChuck Lever <chuck.lever@oracle.com>
Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
parent 7956521a

fs/lockd/xdr4.c

+66 −6
Original line number Diff line number Diff line
@@ -96,6 +96,32 @@ nlm4_decode_fh(__be32 *p, struct nfs_fh *f) 
	return p + XDR_QUADLEN(f->size);

}



/*

 * NLM file handles are defined by specification to be a variable-length

 * XDR opaque no longer than 1024 bytes. However, this implementation

 * limits their length to the size of an NFSv3 file handle.

 */

static bool

svcxdr_decode_fhandle(struct xdr_stream *xdr, struct nfs_fh *fh)

{

	__be32 *p;

	u32 len;



	if (xdr_stream_decode_u32(xdr, &len) < 0)

		return false;

	if (len > NFS_MAXFHSIZE)

		return false;



	p = xdr_inline_decode(xdr, len);

	if (!p)

		return false;

	fh->size = len;

	memcpy(fh->data, p, len);

	memset(fh->data + len, 0, sizeof(fh->data) - len);



	return true;

}



/*

 * Encode and decode owner handle

 */
@@ -135,6 +161,39 @@ nlm4_decode_lock(__be32 *p, struct nlm_lock *lock) 
	return p;

}



static bool

svcxdr_decode_lock(struct xdr_stream *xdr, struct nlm_lock *lock)

{

	struct file_lock *fl = &lock->fl;

	u64 len, start;

	s64 end;



	if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))

		return false;

	if (!svcxdr_decode_fhandle(xdr, &lock->fh))

		return false;

	if (!svcxdr_decode_owner(xdr, &lock->oh))

		return false;

	if (xdr_stream_decode_u32(xdr, &lock->svid) < 0)

		return false;

	if (xdr_stream_decode_u64(xdr, &start) < 0)

		return false;

	if (xdr_stream_decode_u64(xdr, &len) < 0)

		return false;



	locks_init_lock(fl);

	fl->fl_flags = FL_POSIX;

	fl->fl_type  = F_RDLCK;

	end = start + len - 1;

	fl->fl_start = s64_to_loff_t(start);

	if (len == 0 || end < 0)

		fl->fl_end = OFFSET_MAX;

	else

		fl->fl_end = s64_to_loff_t(end);



	return true;

}



/*

 * Encode result of a TEST/TEST_MSG call

 */
@@ -189,19 +248,20 @@ nlm4svc_decode_void(struct svc_rqst *rqstp, __be32 *p) 
int

nlm4svc_decode_testargs(struct svc_rqst *rqstp, __be32 *p)

{

	struct xdr_stream *xdr = &rqstp->rq_arg_stream;

	struct nlm_args *argp = rqstp->rq_argp;

	u32 exclusive;



	if (!(p = nlm4_decode_cookie(p, &argp->cookie)))

	if (!svcxdr_decode_cookie(xdr, &argp->cookie))

		return 0;



	exclusive = ntohl(*p++);

	if (!(p = nlm4_decode_lock(p, &argp->lock)))

	if (xdr_stream_decode_bool(xdr, &exclusive) < 0)

		return 0;

	if (!svcxdr_decode_lock(xdr, &argp->lock))

		return 0;

	if (exclusive)

		argp->lock.fl.fl_type = F_WRLCK;



	return xdr_argsize_check(rqstp, p);

	return 1;

}



int