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dm snapshot: delay merging a chunk until writes to it complete 

Track writes to chunks that are currently being merged and delay merging
a chunk until all writes to that chunk finish.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Reviewed-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
hifive-unleashed-5.1
Mikulas Patocka 2009-12-10 23:52:33 +00:00 committed by Alasdair G Kergon
parent 9fe8625488
commit 17aa03326d
1 changed files with 5 additions and 1 deletions
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6
drivers/md/dm-snap.c
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@ -892,7 +892,7 @@ static void snapshot_merge_next_chunks(struct dm_snapshot *s)
s->num_merging_chunks = 1;
up_write(&s->lock);
/* !!! FIXME: wait until writes to this chunk drain */
__check_for_conflicting_io(s, old_chunk);
dm_kcopyd_copy(s->kcopyd_client, &src, 1, &dest, 0, merge_callback, s);
return;
@ -1635,7 +1635,11 @@ static int snapshot_merge_map(struct dm_target *ti, struct bio *bio,
r = DM_MAPIO_SUBMITTED;
goto out_unlock;
}
remap_exception(s, e, bio, chunk);
if (bio_rw(bio) == WRITE)
map_context->ptr = track_chunk(s, chunk);
goto out_unlock;
}