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bcachefs: Avoid deadlocking on the allocator

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The allocator needs to make sure there's buckets available on the
RESERVE_NONE freelist if at all possible - otherwise foreground IO will
get stuck.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet
2019-09-18 19:33:12 -04:00
committed by Kent Overstreet
parent f4b613410c
commit 4d13e818f5
1 changed files with 1 additions and 1 deletions
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2
fs/bcachefs/alloc_background.c
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@@ -1164,7 +1164,7 @@ static int bch2_allocator_thread(void *arg)
*/
if (!nr ||
(nr < ALLOC_SCAN_BATCH(ca) &&
!fifo_full(&ca->free[RESERVE_MOVINGGC]))) {
!fifo_empty(&ca->free[RESERVE_NONE]))) {
ret = wait_buckets_available(c, ca);
if (ret) {
up_read(&c->gc_lock);