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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: devel-bounces@openvz.org Errors-To: devel-bounces@openvz.org submit_bio_noacct() accounts a write in CBT only when blk-throttle does not hold it: a throttled bio is later issued from the throttle dispatch work with submit_bio_noacct_nocheck(), which skips CBT. So writes delayed by an IO limit never reach CBT, and incremental backups miss them. Account the bio in CBT when the dispatch work issues it. The work runs in process context with no locks held, so CBT may allocate there as it does at submission. https://virtuozzo.atlassian.net/browse/VSTOR-149268 Feature: cbt: changed block tracking (for backup) Signed-off-by: Pavel Tikhomirov --- block/blk-throttle.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/block/blk-throttle.c b/block/blk-throttle.c index 397b6a410f9e5..e1e008a30bf2c 100644 --- a/block/blk-throttle.c +++ b/block/blk-throttle.c @@ -1223,8 +1223,11 @@ static void blk_throtl_dispatch_work_fn(struct work_struct *work) if (!bio_list_empty(&bio_list_on_stack)) { blk_start_plug(&plug); - while ((bio = bio_list_pop(&bio_list_on_stack))) + while ((bio = bio_list_pop(&bio_list_on_stack))) { + /* submit_bio_noacct() did not account it in CBT */ + blk_cbt_bio_queue(q, bio); submit_bio_noacct_nocheck(bio); + } blk_finish_plug(&plug); } } -- 2.55.0 _______________________________________________ Devel mailing list Devel@openvz.org https://lists.openvz.org/mailman/listinfo/devel