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bcache: avoid flushing btree node in cache_set_flush() if io disabled 

When cache_set_flush() is called for too many I/O errors detected on
cache device and the cache set is retiring, inside the function it
doesn't make sense to flushing cached btree nodes from c->btree_cache
because CACHE_SET_IO_DISABLE is set on c->flags already and all I/Os
onto cache device will be rejected.

This patch checks in cache_set_flush() that whether CACHE_SET_IO_DISABLE
is set. If yes, then avoids to flush the cached btree nodes to reduce
more time and make cache set retiring more faster.

Signed-off-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Coly Li 2019-06-28 19:59:28 +08:00 committed by Jens Axboe
parent 695277f16b
commit e6dcbd3e6c
1 changed files with 11 additions and 7 deletions
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6
drivers/md/bcache/super.c
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@ -1553,7 +1553,11 @@ static void cache_set_flush(struct closure *cl)
if (!IS_ERR_OR_NULL(c->root))
list_add(&c->root->list, &c->btree_cache);
/* Should skip this if we're unregistering because of an error */
/*
* Avoid flushing cached nodes if cache set is retiring
* due to too many I/O errors detected.
*/
if (!test_bit(CACHE_SET_IO_DISABLE, &c->flags))
list_for_each_entry(b, &c->btree_cache, list) {
mutex_lock(&b->write_lock);
if (btree_node_dirty(b))