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dm verity: skip verity work on I/O errors when system is shutting down

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If emergency system shutdown is called, like by thermal shutdown,
dm device could be alive when the block device couldn't process
I/O requests anymore. In this status, the handling of I/O errors
by new dm I/O requests or by those already in-flight can lead to
a verity corruption state, which is misjudgment.
So, skip verity work for I/O error when system is shutting down.

Change-Id: I7b2e79283bb5810cefe688bf43b9ae97030ce917
Reviewed-by: Sami Tolvanen <samitolvanen@google.com>
Signed-off-by: Hyeongseok Kim <hyeongseok@gmail.com>
Patch-mainline: dm-devel @ 12/03/20, 00:46
Signed-off-by: Ravi Kumar Siddojigari <rsiddoji@codeaurora.org>
This commit is contained in:
Hyeongseok Kim 2020-12-08 22:46:49 +05:30 • committed by Ravi Kumar Siddojigari
commit 6ecdc84906
1 changed files with 10 additions and 1 deletions
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11
drivers/md/dm-verity-target.c
View file

@ -62,6 +62,14 @@ struct dm_verity_prefetch_work {
struct buffer_aux {
int hash_verified;
};
/*
* While system shutdown, skip verity work for I/O error.
*/
static inline bool verity_is_system_shutting_down(void)
{
return system_state == SYSTEM_HALT || system_state == SYSTEM_POWER_OFF
|| system_state == SYSTEM_RESTART;
}
/*
* Initialize struct buffer_aux for a freshly created buffer.
@ -564,7 +572,8 @@ static void verity_end_io(struct bio *bio)
{
struct dm_verity_io *io = bio->bi_private;
if (bio->bi_status && !verity_fec_is_enabled(io->v)) {
if (bio->bi_status &&
(!verity_fec_is_enabled(io->v) || verity_is_system_shutting_down())) {
verity_finish_io(io, bio->bi_status);
return;
}