linux-kernel - [ 50/60] zram: allow request end to coincide with disksize

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Date:	Mon, 12 Aug 2013 23:34:17 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	Thomas Backlund <tmb@...eia.org>,
	Minchan Kim <minchan@...nel.org>
Subject: [ 50/60] zram: allow request end to coincide with disksize

3.10-stable review patch.  If anyone has any objections, please let me know.

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

From: Sergey Senozhatsky <sergey.senozhatsky@...il.com>

commit 75c7caf5a052ffd8db3312fa7864ee2d142890c4 upstream.

Pass valid_io_request() checks if request end coincides with disksize
(end equals bound), only fail if we attempt to read beyond the bound.

mkfs.ext2 produces numerous errors:
[ 2164.632747] quiet_error: 1 callbacks suppressed
[ 2164.633260] Buffer I/O error on device zram0, logical block 153599
[ 2164.633265] lost page write due to I/O error on zram0

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc: Thomas Backlund <tmb@...eia.org>
Cc: Minchan Kim <minchan@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/staging/zram/zram_drv.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/staging/zram/zram_drv.c
+++ b/drivers/staging/zram/zram_drv.c
@@ -432,7 +432,7 @@ static inline int valid_io_request(struc
 	end = start + (bio->bi_size >> SECTOR_SHIFT);
 	bound = zram->disksize >> SECTOR_SHIFT;
 	/* out of range range */
-	if (unlikely(start >= bound || end >= bound || start > end))
+	if (unlikely(start >= bound || end > bound || start > end))
 		return 0;
 
 	/* I/O request is valid */


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