diff options
| author | Nicholas Swenson <nks@daterainc.com> | 2014-01-10 00:03:04 (GMT) |
|---|---|---|
| committer | Kent Overstreet <kmo@daterainc.com> | 2014-03-18 19:22:33 (GMT) |
| commit | da415a096fc06e49d1a15f7a06bcfe6ad44c5d38 (patch) | |
| tree | 54a5b937d4acd579f43b9dc062afd41ecaa33d82 /drivers/md/bcache/super.c | |
| parent | 90db6919f5f1614d1b7a92052445506bc6c564d2 (diff) | |
| download | linux-da415a096fc06e49d1a15f7a06bcfe6ad44c5d38.tar.xz | |
bcache: Fix moving_gc deadlocking with a foreground write
Deadlock happened because a foreground write slept, waiting for a bucket
to be allocated. Normally the gc would mark buckets available for invalidation.
But the moving_gc was stuck waiting for outstanding writes to complete.
These writes used the bcache_wq, the same queue foreground writes used.
This fix gives moving_gc its own work queue, so it was still finish moving
even if foreground writes are stuck waiting for allocation. It also makes
work queue a parameter to the data_insert path, so moving_gc can use its
workqueue for writes.
Signed-off-by: Nicholas Swenson <nks@daterainc.com>
Signed-off-by: Kent Overstreet <kmo@daterainc.com>
Diffstat (limited to 'drivers/md/bcache/super.c')
| -rw-r--r-- | drivers/md/bcache/super.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c index fb34327..ddfde38 100644 --- a/drivers/md/bcache/super.c +++ b/drivers/md/bcache/super.c @@ -1356,6 +1356,8 @@ static void cache_set_free(struct closure *cl) bch_bset_sort_state_free(&c->sort); free_pages((unsigned long) c->uuids, ilog2(bucket_pages(c))); + if (c->moving_gc_wq) + destroy_workqueue(c->moving_gc_wq); if (c->bio_split) bioset_free(c->bio_split); if (c->fill_iter) @@ -1522,6 +1524,7 @@ struct cache_set *bch_cache_set_alloc(struct cache_sb *sb) !(c->fill_iter = mempool_create_kmalloc_pool(1, iter_size)) || !(c->bio_split = bioset_create(4, offsetof(struct bbio, bio))) || !(c->uuids = alloc_bucket_pages(GFP_KERNEL, c)) || + !(c->moving_gc_wq = create_workqueue("bcache_gc")) || bch_journal_alloc(c) || bch_btree_cache_alloc(c) || bch_open_buckets_alloc(c) || |