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Date: Tue, 10 Jul 2007 12:49:02 -0400 From: Jeff Dike <jdike@...toit.com> To: stable@...nel.org Cc: LKML <linux-kernel@...r.kernel.org>, uml-devel <user-mode-linux-devel@...ts.sourceforge.net> Subject: [PATCH] UML - limit requests on COW devices to 32 sectors COWed devices can't handle more than 32 (64 on x86_64) sectors in one request due to the size of the bitmap being carried around in the io_thread_req. Enforce that by telling the block layer not to put too many sectors in requests to COWed devices. Signed-off-by: Jeff Dike <jdike@...ux.intel.com> -- arch/um/drivers/ubd_kern.c | 2 ++ 1 file changed, 2 insertions(+) Index: linux-2.6.17/arch/um/drivers/ubd_kern.c =================================================================== --- linux-2.6.17.orig/arch/um/drivers/ubd_kern.c 2007-07-09 08:53:09.000000000 -0400 +++ linux-2.6.17/arch/um/drivers/ubd_kern.c 2007-07-09 18:08:33.000000000 -0400 @@ -712,6 +712,8 @@ static int ubd_add(int n, char **error_o ubd_dev->queue->queuedata = ubd_dev; blk_queue_max_hw_segments(ubd_dev->queue, MAX_SG); + if(ubd_dev->cow.file != NULL) + blk_queue_max_sectors(ubd_dev->queue, 8 * sizeof(long)); err = ubd_disk_register(MAJOR_NR, ubd_dev->size, n, &ubd_gendisk[n]); if(err){ *error_out = "Failed to register device"; - 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/
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