@@ -199,16 +199,15 @@ static struct btrfs_block_group *find_next_block_group(
static struct btrfs_block_group *peek_discard_list(
struct btrfs_discard_ctl *discard_ctl,
enum btrfs_discard_state *discard_state,
- int *discard_index)
+ int *discard_index, u64 now)
{
struct btrfs_block_group *block_group;
- const u64 now = ktime_get_ns();
spin_lock(&discard_ctl->lock);
again:
block_group = find_next_block_group(discard_ctl, now);
- if (block_group && now > block_group->discard_eligible_time) {
+ if (block_group && now >= block_group->discard_eligible_time) {
if (block_group->discard_index == BTRFS_DISCARD_INDEX_UNUSED &&
block_group->used != 0) {
if (btrfs_is_block_group_data_only(block_group))
@@ -222,12 +221,11 @@ static struct btrfs_block_group *peek_discard_list(
block_group->discard_state = BTRFS_DISCARD_EXTENTS;
}
discard_ctl->block_group = block_group;
+ }
+ if (block_group) {
*discard_state = block_group->discard_state;
*discard_index = block_group->discard_index;
- } else {
- block_group = NULL;
}
-
spin_unlock(&discard_ctl->lock);
return block_group;
@@ -438,13 +436,18 @@ static void btrfs_discard_workfn(struct work_struct *work)
int discard_index = 0;
u64 trimmed = 0;
u64 minlen = 0;
+ u64 now = ktime_get_ns();
discard_ctl = container_of(work, struct btrfs_discard_ctl, work.work);
block_group = peek_discard_list(discard_ctl, &discard_state,
- &discard_index);
+ &discard_index, now);
if (!block_group || !btrfs_run_discard_work(discard_ctl))
return;
+ if (now < block_group->discard_eligible_time) {
+ btrfs_discard_schedule_work(discard_ctl, false);
+ return;
+ }
/* Perform discarding */
minlen = discard_minlen[discard_index];
Might happen that bg->discard_eligible_time was changed without rescheduling, so btrfs_discard_workfn() wakes up earlier than that new time, peek_discard_list() return null, and all work halts and goes to sleep without further rescheduling even there are block groups to discard. It happens pretty often, but not so visible from the userspace because after some time it usually will be kicked off anyway by someone else calling btrfs_discard_reschedule_work(). Fix it by continue rescheduling if block group discard lists are not empty. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> --- fs/btrfs/discard.c | 17 ++++++++++------- 1 file changed, 10 insertions(+), 7 deletions(-)