From 0c2148da5b613455c6ee762b03c9a1beb14cae5f Mon Sep 17 00:00:00 2001
From: Casey Bodley <cbodley@citi.umich.edu>
Date: Fri, 25 Feb 2011 11:44:41 -0800
Subject: [PATCH] pnfs: support for mdsthreshold attribute

hacked up and tested against bluearc server

Signed-off-by: Casey Bodley <cbodley@citi.umich.edu>
---
 daemon/nfs41_types.h | 20 +++++++++++++++++
 daemon/nfs41_xdr.c   | 52 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 72 insertions(+)

diff --git a/daemon/nfs41_types.h b/daemon/nfs41_types.h
index 50a3487..0072503 100644
--- a/daemon/nfs41_types.h
+++ b/daemon/nfs41_types.h
@@ -161,8 +161,28 @@ typedef struct __fs_locations4 {
     uint32_t        location_count;
 } fs_locations4;
 
+enum {
+    MDSTHRESH_READ = 0,
+    MDSTHRESH_WRITE,
+    MDSTHRESH_READ_IO,
+    MDSTHRESH_WRITE_IO,
+
+    MAX_MDSTHRESH_HINTS
+};
+typedef struct __threshold_item4 {
+    uint32_t        type;
+    uint64_t        hints[MAX_MDSTHRESH_HINTS];
+} threshold_item4;
+
+#define MAX_MDSTHRESHOLD_ITEMS 1
+typedef struct __mdsthreshold4 {
+    uint32_t        count;
+    threshold_item4 items[MAX_MDSTHRESHOLD_ITEMS];
+} mdsthreshold4;
+
 typedef struct __nfs41_file_info {
     nfs41_fsid              fsid;
+    mdsthreshold4           mdsthreshold;
     nfstime4                time_access;
     nfstime4                time_create;
     nfstime4                time_modify;
diff --git a/daemon/nfs41_xdr.c b/daemon/nfs41_xdr.c
index 43bdb89..838b577 100644
--- a/daemon/nfs41_xdr.c
+++ b/daemon/nfs41_xdr.c
@@ -247,6 +247,52 @@ static bool_t xdr_layout_types(
     return TRUE;
 }
 
+static bool_t xdr_threshold_item(
+    XDR *xdr,
+    threshold_item4 *item)
+{
+    bitmap4 bitmap;
+
+    if (!xdr_u_int32_t(xdr, &item->type))
+        return FALSE;
+
+    if (!xdr_bitmap4(xdr, &bitmap))
+        return FALSE;
+
+    if (!xdr_u_int32_t(xdr, &bitmap.count))
+        return FALSE;
+
+    if (bitmap.count) {
+        if (bitmap.arr[0] & 0x1 && !xdr_u_hyper(xdr, &item->hints[0]))
+            return FALSE;
+        if (bitmap.arr[0] & 0x2 && !xdr_u_hyper(xdr, &item->hints[1]))
+            return FALSE;
+        if (bitmap.arr[0] & 0x4 && !xdr_u_hyper(xdr, &item->hints[2]))
+            return FALSE;
+        if (bitmap.arr[0] & 0x8 && !xdr_u_hyper(xdr, &item->hints[3]))
+            return FALSE;
+    }
+    return TRUE;
+}
+
+static bool_t xdr_mdsthreshold(
+    XDR *xdr,
+    mdsthreshold4 *mdsthreshold)
+{
+    uint32_t i;
+
+    if (!xdr_u_int32_t(xdr, &mdsthreshold->count))
+        return FALSE;
+
+    if (mdsthreshold->count > MAX_MDSTHRESHOLD_ITEMS)
+        return FALSE;
+
+    for (i = 0; i < mdsthreshold->count; i++)
+        if (!xdr_threshold_item(xdr, &mdsthreshold->items[i]))
+            return FALSE;
+    return TRUE;
+}
+
 /* pathname4
  * decode a variable array of components into a nfs41_abs_path */
 static bool_t decode_pathname4(
@@ -1652,6 +1698,12 @@ static bool_t decode_file_attrs(
                 return FALSE;
         }
     }
+    if (attrs->attrmask.count >= 3) {
+        if (attrs->attrmask.arr[2] & FATTR4_WORD2_MDSTHRESHOLD) {
+            if (!xdr_mdsthreshold(xdr, &info->mdsthreshold))
+                return FALSE;
+        }
+    }
     return TRUE;
 }