NFSD: Implement SEEK
This patch adds server support for the NFS v4.2 operation SEEK, which
returns the position of the next hole or data segment in a file.
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 0311bae..7ec6463 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -1514,6 +1514,22 @@
}
static __be32
+nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
+{
+ DECODE_HEAD;
+
+ status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
+ if (status)
+ return status;
+
+ READ_BUF(8 + 4);
+ p = xdr_decode_hyper(p, &seek->seek_offset);
+ seek->seek_whence = be32_to_cpup(p);
+
+ DECODE_TAIL;
+}
+
+static __be32
nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
{
return nfs_ok;
@@ -1598,7 +1614,7 @@
[OP_OFFLOAD_CANCEL] = (nfsd4_dec)nfsd4_decode_notsupp,
[OP_OFFLOAD_STATUS] = (nfsd4_dec)nfsd4_decode_notsupp,
[OP_READ_PLUS] = (nfsd4_dec)nfsd4_decode_notsupp,
- [OP_SEEK] = (nfsd4_dec)nfsd4_decode_notsupp,
+ [OP_SEEK] = (nfsd4_dec)nfsd4_decode_seek,
[OP_WRITE_SAME] = (nfsd4_dec)nfsd4_decode_notsupp,
};
@@ -3766,6 +3782,22 @@
}
static __be32
+nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
+ struct nfsd4_seek *seek)
+{
+ __be32 *p;
+
+ if (nfserr)
+ return nfserr;
+
+ p = xdr_reserve_space(&resp->xdr, 4 + 8);
+ *p++ = cpu_to_be32(seek->seek_eof);
+ p = xdr_encode_hyper(p, seek->seek_pos);
+
+ return nfserr;
+}
+
+static __be32
nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
{
return nfserr;
@@ -3849,7 +3881,7 @@
[OP_OFFLOAD_CANCEL] = (nfsd4_enc)nfsd4_encode_noop,
[OP_OFFLOAD_STATUS] = (nfsd4_enc)nfsd4_encode_noop,
[OP_READ_PLUS] = (nfsd4_enc)nfsd4_encode_noop,
- [OP_SEEK] = (nfsd4_enc)nfsd4_encode_noop,
+ [OP_SEEK] = (nfsd4_enc)nfsd4_encode_seek,
[OP_WRITE_SAME] = (nfsd4_enc)nfsd4_encode_noop,
};