On Wed, Jan 02, 2008 at 12:49:19PM -0500, Martin Paraskevov wrote:
> However, when I try to specify a cow file the boot is unsuccessful:
>
> ./linux-2.6.22-rc2 mem=128M ubda=cow1,FedoraCore5-x86-root_fs umid=fedora1
> Kernel panic - not syncing: Operation too long
This is a long-fixed bug. Either get a newer UML or apply these two
patches (two because the first one didn't totally fix the problem):
commit 8619b86f20588c020b280e6f67a9b8712b1ee38a
Author: Jeff Dike <[EMAIL PROTECTED]>
Date: Sun Jul 15 23:38:58 2007 -0700
uml: limit request size on COWed devices
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 <[EMAIL PROTECTED]>
Cc: Paolo 'Blaisorblade' Giarrusso <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index 0947f2e..fc27f6c 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -712,6 +712,8 @@ static int ubd_add(int n, char **error_out)
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";
commit f4768ffd1d4b7b07ae2c4c3d93c9f99cd68e996c
Author: Jeff Dike <[EMAIL PROTECTED]>
Date: Wed Aug 22 14:01:53 2007 -0700
uml: fix previous request size limit fix
The previous patch which limited the number of sectors in a single request
to a COWed device was correct in concept, but the limit was implemented in
the wrong place.
By putting it in ubd_add, it covered the cases where the COWing was
specified on the command line. However, when the command line only has the
COW file specified, the fact that it's a COW file isn't known until it's
opened, so the limit is missed in these cases.
This patch moves the sector limit from ubd_add to ubd_open_dev.
Signed-off-by: Jeff Dike <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index aff661f..0eabe73 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -612,6 +612,8 @@ static int ubd_open_dev(struct ubd *ubd_dev)
ubd_dev->fd = fd;
if(ubd_dev->cow.file != NULL){
+ blk_queue_max_sectors(ubd_dev->queue, 8 * sizeof(long));
+
err = -ENOMEM;
ubd_dev->cow.bitmap = (void *) vmalloc(ubd_dev->cow.bitmap_len);
if(ubd_dev->cow.bitmap == NULL){
@@ -712,8 +714,6 @@ static int ubd_add(int n, char **error_out)
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";
--
Work email - jdike at linux dot intel dot com
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