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ANDROID: dm-bow: Pass through zero sized requests

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Zero sized requests appeared in 5.15, and break validation logic in user
space. Simply pass through, as there is no reason to handle.

aosp/3238494 enables checkpoints on ext4 in cuttlefish, get this too

With all the patches in place, run:

launch_cvd \
  -userdata_format="ext4" \
  --data_policy=always_create --blank_data_image_mb=16000

then run

atest vts_kernel_checkpoint_test

Test: atest vts_kernel_checkpoint_test passes
Bug: 210958368
Signed-off-by: Paul Lawrence <paullawrence@google.com>
Change-Id: I3bc8037dc53e02f10c3f41de2f1176e774482815
This commit is contained in:
Paul Lawrence 2024-08-22 08:59:42 -07:00 committed by Treehugger Robot
parent 4b5ae75dd7
commit facb781dc9
1 changed files with 3 additions and 0 deletions
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3
drivers/md/dm-bow.c
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@ -1125,6 +1125,9 @@ static int dm_bow_map(struct dm_target *ti, struct bio *bio)
if (bio_data_dir(bio) == READ && bio->bi_iter.bi_sector != 0)
return remap_unless_illegal_trim(bc, bio);
if (bio->bi_iter.bi_size == 0)
return remap_unless_illegal_trim(bc, bio);
if (atomic_read(&bc->state) != COMMITTED) {
enum state state;