diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index a261f1800922f54ff29a7d6f1e127008997a3bcc..74fb15eefc3165e37f03aa5ebf3b326cac7c396d 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -33,6 +33,7 @@
  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 #include <linux/file.h>
+#include <linux/falloc.h>
 #include <linux/slab.h>
 
 #include "idmap.h"
@@ -1043,6 +1044,14 @@ nfsd4_allocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 	return nfsd4_fallocate(rqstp, cstate, fallocate, 0);
 }
 
+static __be32
+nfsd4_deallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
+		 struct nfsd4_fallocate *fallocate)
+{
+	return nfsd4_fallocate(rqstp, cstate, fallocate,
+			       FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE);
+}
+
 static __be32
 nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 		struct nfsd4_seek *seek)
@@ -1965,6 +1974,12 @@ static struct nfsd4_operation nfsd4_ops[] = {
 		.op_name = "OP_ALLOCATE",
 		.op_rsize_bop = (nfsd4op_rsize)nfsd4_write_rsize,
 	},
+	[OP_DEALLOCATE] = {
+		.op_func = (nfsd4op_func)nfsd4_deallocate,
+		.op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
+		.op_name = "OP_DEALLOCATE",
+		.op_rsize_bop = (nfsd4op_rsize)nfsd4_write_rsize,
+	},
 	[OP_SEEK] = {
 		.op_func = (nfsd4op_func)nfsd4_seek,
 		.op_name = "OP_SEEK",
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index a60cff86fc28d57baa9468bf1d90ca6522c09817..0622d4f4a9a242313732a5a9014b493500abdf02 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -1624,7 +1624,7 @@ static nfsd4_dec nfsd4_dec_ops[] = {
 	[OP_ALLOCATE]		= (nfsd4_dec)nfsd4_decode_fallocate,
 	[OP_COPY]		= (nfsd4_dec)nfsd4_decode_notsupp,
 	[OP_COPY_NOTIFY]	= (nfsd4_dec)nfsd4_decode_notsupp,
-	[OP_DEALLOCATE]		= (nfsd4_dec)nfsd4_decode_notsupp,
+	[OP_DEALLOCATE]		= (nfsd4_dec)nfsd4_decode_fallocate,
 	[OP_IO_ADVISE]		= (nfsd4_dec)nfsd4_decode_notsupp,
 	[OP_LAYOUTERROR]	= (nfsd4_dec)nfsd4_decode_notsupp,
 	[OP_LAYOUTSTATS]	= (nfsd4_dec)nfsd4_decode_notsupp,
diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
index eeaa0d0c4f794148fc76bd2bcd32124940204886..90a5925bd6ab49484ad44c4a19d421b664ede361 100644
--- a/fs/nfsd/xdr4.h
+++ b/fs/nfsd/xdr4.h
@@ -494,6 +494,7 @@ struct nfsd4_op {
 
 		/* NFSv4.2 */
 		struct nfsd4_fallocate		allocate;
+		struct nfsd4_fallocate		deallocate;
 		struct nfsd4_seek		seek;
 	} u;
 	struct nfs4_replay *			replay;