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

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Date:	Sat, 7 Jan 2012 19:23:32 -0800 (PST)
From:	Shantanu Goel <sgoel01@...oo.com>
To:	Kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH] ext4: Fix up range_end offset in range cyclic writeback



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@...oo.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;
        }
--
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