this was very wrong - mempool_alloc() only guarantees success with GFP_WAIT.
bcache uses GFP_NOWAIT in various other places where we have a fallback,
circuits must've gotten crossed when writing this code or something.
Signed-off-by: Kent Overstreet <kmo@xxxxxxxxxxxxx>
---
The bug was introduced in v3.11, fixed in v3.17.
Jens mentioned bcache has many stable@ candidates previously:
https://lkml.org/lkml/2014/9/5/360
I'm cherry-picking this fix because I was getting crashes.
---
drivers/md/bcache/btree.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/md/bcache/btree.c b/drivers/md/bcache/btree.c
index 9dd9f1c..e538d45 100644
--- a/drivers/md/bcache/btree.c
+++ b/drivers/md/bcache/btree.c
@@ -200,11 +200,11 @@ void bch_btree_node_read_done(struct btree *b)
{
const char *err = "bad btree header";
struct bset *i = btree_bset_first(b);
struct btree_iter *iter;
- iter = mempool_alloc(b->c->fill_iter, GFP_NOWAIT);
+ iter = mempool_alloc(b->c->fill_iter, GFP_NOIO);
iter->size = b->c->sb.bucket_size / b->c->sb.block_size;
iter->used = 0;
#ifdef CONFIG_BCACHE_DEBUG
iter->b = &b->keys;
--
2.2.0.71.g3365589
--
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