[patch 23/94] md: fix bitmap-on-external-file bug.

[Greg KH]

2.6.28-stable review patch.  If anyone has any objections, please let us know.

------------------

From: NeilBrown <neilb@xxxxxxx>

commit 538452700d95480c16e7aa6b10ff77cd937d33f4 upstream.

commit a2ed9615e3222645007fc19991aedf30eed3ecfd
fixed a bug with 'internal' bitmaps, but in the process broke
'in a file' bitmaps.  So they are broken in 2.6.28

This fixes it, and needs to go in 2.6.28-stable.

Signed-off-by: NeilBrown <neilb@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/md/bitmap.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -964,9 +964,11 @@ static int bitmap_init_from_disk(struct 
 				 */
 				page = bitmap->sb_page;
 				offset = sizeof(bitmap_super_t);
-				read_sb_page(bitmap->mddev, bitmap->offset,
-					     page,
-					     index, count);
+				if (!file)
+					read_sb_page(bitmap->mddev,
+						     bitmap->offset,
+						     page,
+						     index, count);
 			} else if (file) {
 				page = read_page(file, index, bitmap, count);
 				offset = 0;

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