pnfs: GETDEVICELIST

The block driver uses GETDEVICELIST

Signed-off-by: Andy Adamson <andros@netapp.com>
[pass struct nfs_server * to getdevicelist]
[get machince creds for getdevicelist]
[fix getdevicelist decode sizing]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Benny Halevy <bhalevy@tonian.com>
Signed-off-by: Jim Rees <rees@umich.edu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 48 insertions, 0 deletions

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index efa6ae822ca8..af32d3df0544 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -5834,6 +5834,54 @@ int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
         return status;
 }
 
+/*
+ * Retrieve the list of Data Server devices from the MDS.
+ */
+static int _nfs4_getdevicelist(struct nfs_server *server,
+                                    const struct nfs_fh *fh,
+                                    struct pnfs_devicelist *devlist)
+{
+        struct nfs4_getdevicelist_args args = {
+                .fh = fh,
+                .layoutclass = server->pnfs_curr_ld->id,
+        };
+        struct nfs4_getdevicelist_res res = {
+                .devlist = devlist,
+        };
+        struct rpc_message msg = {
+                .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
+                .rpc_argp = &args,
+                .rpc_resp = &res,
+        };
+        int status;
+
+        dprintk("--> %s\n", __func__);
+        status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
+                                &res.seq_res, 0);
+        dprintk("<-- %s status=%d\n", __func__, status);
+        return status;
+}
+
+int nfs4_proc_getdevicelist(struct nfs_server *server,
+                            const struct nfs_fh *fh,
+                            struct pnfs_devicelist *devlist)
+{
+        struct nfs4_exception exception = { };
+        int err;
+
+        do {
+                err = nfs4_handle_exception(server,
+                                _nfs4_getdevicelist(server, fh, devlist),
+                                &exception);
+        } while (exception.retry);
+
+        dprintk("%s: err=%d, num_devs=%u\n", __func__,
+                err, devlist->num_devs);
+
+        return err;
+}
+EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
+
 static int
 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
 {