On Fri, 24 Oct 2025, Askar Safin wrote:
> Hi.
>
> Hibernate to swap located on dm-integrity doesn't work.
> Let me first describe why I need this, then I will describe a bug with steps
> to reproduce
> (and some speculation on cause of the bug).
Hi
Does this patch fix it?
Mikulas
From: Mikulas Patocka <[email protected]>
There was reported failure that hibernation doesn't work with
dm-integrity. The reason for the failure is that the hibernation code
doesn't issue the FLUSH bio - the data still sits in the dm-integrity
cache and they are lost when poweroff happens.
This commit fixes the suspend code so that it issues flushes before
writing the header and after writing the header.
Signed-off-by: Mikulas Patocka <[email protected]>
Reported-by: Askar Safin <[email protected]>
Link:
https://lore.kernel.org/dm-devel/[email protected]/T/
Cc: [email protected]
---
kernel/power/swap.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
Index: linux-2.6/kernel/power/swap.c
===================================================================
--- linux-2.6.orig/kernel/power/swap.c 2025-10-13 21:42:48.000000000 +0200
+++ linux-2.6/kernel/power/swap.c 2025-10-24 12:01:32.000000000 +0200
@@ -320,8 +320,10 @@ static int mark_swapfiles(struct swap_ma
swsusp_header->flags = flags;
if (flags & SF_CRC32_MODE)
swsusp_header->crc32 = handle->crc32;
- error = hib_submit_io_sync(REQ_OP_WRITE | REQ_SYNC,
+ error = hib_submit_io_sync(REQ_OP_WRITE | REQ_SYNC |
REQ_PREFLUSH,
swsusp_resume_block, swsusp_header);
+ if (!error)
+ error =
blkdev_issue_flush(file_bdev(hib_resume_bdev_file));
} else {
pr_err("Swap header not found!\n");
error = -ENODEV;
