[PATCH] ext4: Fix up range_end offset in range cyclic writeback

[Shantanu Goel <sgoel01@yahoo.com>]

Hi,

The patch below fixes the range_end calculation which should be a byte offset and not a page index.  Also, the patch updates the `end' index as well when looping again in range cyclic mode.

Signed-off-by: Shantanu Goel <sgoel01@yahoo.com>

--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2324,9 +2324,10 @@ retry:
        blk_finish_plug(&plug);
        if (!io_done && !cycled) {
                cycled = 1;
+               end = index - 1;
                index = 0;
-               wbc->range_start = index << PAGE_CACHE_SHIFT;
-               wbc->range_end  = mapping->writeback_index - 1;
+               wbc->range_start = 0;
+               wbc->range_end  = ((loff_t)(end + 1) << PAGE_CACHE_SHIFT) - 1;
                goto retry;
        }