On Tue, 28 Sep 2010 23:47:36 +0200
Richard Weinberger <rich...@nod.at> wrote:
> Under high load the file system gets corrupted.
> This patch fixes the issue.
>
> Many thanks to Janjaap Bos <janj...@bos.nl>!
>
> LKML-Reference: <AANLkTi=PTp7YW_eYxtF-H2QSxgei3whWH59wU0C9oCkz () mail !
> gmail ! com>
> Signed-off-by: Richard Weinberger <rich...@nod.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){
This is a workaround, I think? Do we know what the actual bug is?
>From the comment it appears to be a regression?
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