From 12a9c52e516b94888db0a4502946242e3b14709f Mon Sep 17 00:00:00 2001
From: Vladimir Serbinenko <phcoder@gmail.com>
Date: Sat, 24 Jan 2015 20:57:26 +0100
Subject: [PATCH 187/506] zfs: Fix disk-matching logic.

Reported by: Tim Chase <dweeezil>
---
 grub-core/fs/zfs/zfs.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/grub-core/fs/zfs/zfs.c b/grub-core/fs/zfs/zfs.c
index c943b52..c8c7b97 100644
--- a/grub-core/fs/zfs/zfs.c
+++ b/grub-core/fs/zfs/zfs.c
@@ -252,7 +252,6 @@ struct grub_zfs_data
 
   uberblock_t current_uberblock;
 
-  int mounted;
   grub_uint64_t guid;
 };
 
@@ -957,7 +956,7 @@ nvpair_value (const char *nvp,char **val,
 static grub_err_t
 check_pool_label (struct grub_zfs_data *data,
 		  struct grub_zfs_device_desc *diskdesc,
-		  int *inserted)
+		  int *inserted, int original)
 {
   grub_uint64_t pool_state, txg = 0;
   char *nvlist,*features;
@@ -1081,11 +1080,12 @@ check_pool_label (struct grub_zfs_data *data,
 
   grub_dprintf ("zfs", "check 11 passed\n");
 
-  if (data->mounted && data->guid != poolguid)
-    return grub_error (GRUB_ERR_BAD_FS, "another zpool");
-  else
+  if (original)
     data->guid = poolguid;
 
+  if (data->guid != poolguid)
+    return grub_error (GRUB_ERR_BAD_FS, "another zpool");
+
   {
     char *nv;
     nv = grub_zfs_nvlist_lookup_nvlist (nvlist, ZPOOL_CONFIG_VDEV_TREE);
@@ -1186,7 +1186,7 @@ scan_disk (grub_device_t dev, struct grub_zfs_data *data,
 	}
       grub_dprintf ("zfs", "label ok %d\n", label);
 
-      err = check_pool_label (data, &desc, inserted);
+      err = check_pool_label (data, &desc, inserted, original);
       if (err || !*inserted)
 	{
 	  grub_errno = GRUB_ERR_NONE;
@@ -3612,8 +3612,6 @@ zfs_mount (grub_device_t dev)
 					 ub_endian) >> 63) & 1;
   grub_free (osp);
 
-  data->mounted = 1;
-
   return data;
 }
 
-- 
2.4.3