Commit feb7695f authored by Mike Snitzer's avatar Mike Snitzer

dm io: fix duplicate bio completion due to missing ref count

If only a subset of the devices associated with multiple regions support
a given special operation (eg. DISCARD) then the dec_count() that is
used to set error for the region must increment the io->count.

Otherwise, when the dec_count() is called it can cause the dm-io
caller's bio to be completed multiple times.  As was reported against
the dm-mirror target that had mirror legs with a mix of discard
capabilities.

Bug: https://bugzilla.kernel.org/show_bug.cgi?id=196077Reported-by: default avatarZhang Yi <yizhan@redhat.com>
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
parent 7def52b7
......@@ -317,8 +317,8 @@ static void do_region(int op, int op_flags, unsigned region,
else if (op == REQ_OP_WRITE_SAME)
special_cmd_max_sectors = q->limits.max_write_same_sectors;
if ((op == REQ_OP_DISCARD || op == REQ_OP_WRITE_ZEROES ||
op == REQ_OP_WRITE_SAME) &&
special_cmd_max_sectors == 0) {
op == REQ_OP_WRITE_SAME) && special_cmd_max_sectors == 0) {
atomic_inc(&io->count);
dec_count(io, region, -EOPNOTSUPP);
return;
}
......
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