1 files changed, 49 insertions, 0 deletions

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 5e0dc528a0e8..cdeb3cfd6f32 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1013,6 +1013,49 @@ nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
         return status;
 }
 
+static __be32
+nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
+                struct nfsd4_seek *seek)
+{
+        int whence;
+        __be32 status;
+        struct file *file;
+
+        status = nfs4_preprocess_stateid_op(SVC_NET(rqstp), cstate,
+                                            &seek->seek_stateid,
+                                            RD_STATE, &file);
+        if (status) {
+                dprintk("NFSD: nfsd4_seek: couldn't process stateid!\n");
+                return status;
+        }
+
+        switch (seek->seek_whence) {
+        case NFS4_CONTENT_DATA:
+                whence = SEEK_DATA;
+                break;
+        case NFS4_CONTENT_HOLE:
+                whence = SEEK_HOLE;
+                break;
+        default:
+                status = nfserr_union_notsupp;
+                goto out;
+        }
+
+        /*
+         * Note:  This call does change file->f_pos, but nothing in NFSD
+         *        should ever file->f_pos.
+         */
+        seek->seek_pos = vfs_llseek(file, seek->seek_offset, whence);
+        if (seek->seek_pos < 0)
+                status = nfserrno(seek->seek_pos);
+        else if (seek->seek_pos >= i_size_read(file_inode(file)))
+                seek->seek_eof = true;
+
+out:
+        fput(file);
+        return status;
+}
+
 /* This routine never returns NFS_OK!  If there are no other errors, it
  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
@@ -1881,6 +1924,12 @@ static struct nfsd4_operation nfsd4_ops[] = {
                 .op_get_currentstateid = (stateid_getter)nfsd4_get_freestateid,
                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
         },
+
+        /* NFSv4.2 operations */
+        [OP_SEEK] = {
+                .op_func = (nfsd4op_func)nfsd4_seek,
+                .op_name = "OP_SEEK",
+        },
 };
 
 int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)