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dm era: only resize metadata in preresume

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commit cca2c6aebe upstream.

Metadata resize shouldn't happen in the ctr. The ctr loads a temporary
(inactive) table that will only become active upon resume. That is why
resize should always be done in terms of resume. Otherwise a load (ctr)
whose inactive table never becomes active will incorrectly resize the
metadata.

Also, perform the resize directly in preresume, instead of using the
worker to do it.

The worker might run other metadata operations, e.g., it could start
digestion, before resizing the metadata. These operations will end up
using the old size.

This could lead to errors, like:

  device-mapper: era: metadata_digest_transcribe_writeset: dm_array_set_value failed
  device-mapper: era: process_old_eras: digest step failed, stopping digestion

The reason of the above error is that the worker started the digestion
of the archived writeset using the old, larger size.

As a result, metadata_digest_transcribe_writeset tried to write beyond
the end of the era array.

Fixes: eec40579d8 ("dm: add era target")
Cc: stable@vger.kernel.org # v3.15+
Signed-off-by: Nikos Tsironis <ntsironis@arrikto.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Nikos Tsironis
2021-02-11 16:22:43 +02:00
committed by Greg Kroah-Hartman
parent a46ab7c3a4
commit 9bfb6d5284
1 changed files with 10 additions and 11 deletions
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21
drivers/md/dm-era-target.c
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@@ -1501,15 +1501,6 @@ static int era_ctr(struct dm_target *ti, unsigned argc, char **argv)
}
era->md = md;
era->nr_blocks = calc_nr_blocks(era);
r = metadata_resize(era->md, &era->nr_blocks);
if (r) {
ti->error = "couldn't resize metadata";
era_destroy(era);
return -ENOMEM;
}
era->wq = alloc_ordered_workqueue("dm-" DM_MSG_PREFIX, WQ_MEM_RECLAIM);
if (!era->wq) {
ti->error = "could not create workqueue for metadata object";
@@ -1584,9 +1575,17 @@ static int era_preresume(struct dm_target *ti)
dm_block_t new_size = calc_nr_blocks(era);
if (era->nr_blocks != new_size) {
r = in_worker1(era, metadata_resize, &new_size);
if (r)
r = metadata_resize(era->md, &new_size);
if (r) {
DMERR("%s: metadata_resize failed", __func__);
return r;
}
r = metadata_commit(era->md);
if (r) {
DMERR("%s: metadata_commit failed", __func__);
return r;
}
era->nr_blocks = new_size;
}