The patch titled
uml: limit request size on COWed devices
has been added to the -mm tree. Its filename is
uml-limit-request-size-on-cowed-devices.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: uml: limit request size on COWed devices
From: Jeff Dike <jdike@xxxxxxxxxxx>
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@xxxxxxxxxxxxxxx>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/um/drivers/ubd_kern.c | 2 ++
1 files changed, 2 insertions(+)
diff -puN arch/um/drivers/ubd_kern.c~uml-limit-request-size-on-cowed-devices arch/um/drivers/ubd_kern.c
--- a/arch/um/drivers/ubd_kern.c~uml-limit-request-size-on-cowed-devices
+++ a/arch/um/drivers/ubd_kern.c
@@ -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";
_
Patches currently in -mm which might be from jdike@xxxxxxxxxxx are
hostfs-convert-to-new-aops.patch
uml-fix-request-sector-update.patch
uml-use-get_free_pages-to-allocate-kernel-stacks.patch
add-generic-exit-time-stack-depth-checking-to-config_debug_stack_usage.patch
uml-xterm-driver-tidying.patch
uml-pty-channel-tidying.patch
uml-handle-errors-on-opening-host-side-of-consoles.patch
uml-sigio-support-cleanup.patch
uml-simplify-helper-stack-handling.patch
uml-eliminate-kernel-allocator-wrappers.patch
uml-export-hostfs-symbols.patch
uml-limit-request-size-on-cowed-devices.patch
uml-remove-dead-file.patch
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