[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-Id: <1285710456-4435-1-git-send-email-richard@nod.at>
Date: Tue, 28 Sep 2010 23:47:36 +0200
From: Richard Weinberger <richard@....at>
To: akpm@...ux-foundation.org
Cc: linux-kernel@...r.kernel.org, jdike@...toit.com,
user-mode-linux-devel@...ts.sourceforge.net,
user-mode-linux-user@...ts.sourceforge.net, janjaap@....nl,
geert@...ux-m68k.org, jaxboe@...ionio.com,
martin.petersen@...cle.com, adobriyan@...il.com,
cdfrey@...rsquare.net, Richard Weinberger <richard@....at>
Subject: [PATCH 1/1] um: ubd: Fix data corruption
Under high load the file system gets corrupted.
This patch fixes the issue.
Many thanks to Janjaap Bos <janjaap@....nl>!
LKML-Reference: <AANLkTi=PTp7YW_eYxtF-H2QSxgei3whWH59wU0C9oCkz () mail ! gmail ! com>
Signed-off-by: Richard Weinberger <richard@....at>
---
arch/um/drivers/ubd_kern.c | 7 +++++--
1 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index 1bcd208..2874b83 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -748,9 +748,12 @@ static int ubd_open_dev(struct ubd *ubd_dev)
}
ubd_dev->fd = fd;
- if(ubd_dev->cow.file != NULL){
- blk_queue_max_hw_sectors(ubd_dev->queue, 8 * sizeof(long));
+ /* A setting higher than 1 sector currently (>= v2.6.31) generates
+ data loss, both for raw and cow ubd. */
+ blk_queue_max_hw_sectors(ubd_dev->queue, 1 * sizeof(long));
+ blk_queue_max_segments(ubd_dev->queue, 1 * sizeof(long));
+ if (ubd_dev->cow.file != NULL) {
err = -ENOMEM;
ubd_dev->cow.bitmap = vmalloc(ubd_dev->cow.bitmap_len);
if(ubd_dev->cow.bitmap == NULL){
--
1.6.6.1
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists