f2fs: init discard policy after thread wakeup

Under the current logic, after the discard thread wakes up, it will not
run according to the expected policy, but will use the expected policy
before sleep. Move the strategy selection to after the thread wakes up,
so that the running state of the thread meets expectations.

Signed-off-by: Yangtao Li <[email protected]>
Reviewed-by: Chao Yu <[email protected]>
Signed-off-by: Jaegeuk Kim <[email protected]>

1 files changed, 9 insertions, 11 deletions

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 37c721e1eb03..73ad8dc9a4d3 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -1679,6 +1679,11 @@ static int issue_discard_thread(void *data)
 	set_freezable();
 
 	do {
+		wait_event_interruptible_timeout(*q,
+				kthread_should_stop() || freezing(current) ||
+				dcc->discard_wake,
+				msecs_to_jiffies(wait_ms));
+
 		if (sbi->gc_mode == GC_URGENT_HIGH ||
 			!f2fs_available_free_memory(sbi, DISCARD_CACHE))
 			__init_discard_policy(sbi, &dpolicy, DPOLICY_FORCE, 1);
@@ -1686,14 +1691,6 @@ static int issue_discard_thread(void *data)
 			__init_discard_policy(sbi, &dpolicy, DPOLICY_BG,
 						dcc->discard_granularity);
 
-		if (!atomic_read(&dcc->discard_cmd_cnt))
-		       wait_ms = dpolicy.max_interval;
-
-		wait_event_interruptible_timeout(*q,
-				kthread_should_stop() || freezing(current) ||
-				dcc->discard_wake,
-				msecs_to_jiffies(wait_ms));
-
 		if (dcc->discard_wake)
 			dcc->discard_wake = 0;
 
@@ -1707,12 +1704,11 @@ static int issue_discard_thread(void *data)
 			continue;
 		if (kthread_should_stop())
 			return 0;
-		if (is_sbi_flag_set(sbi, SBI_NEED_FSCK)) {
+		if (is_sbi_flag_set(sbi, SBI_NEED_FSCK) ||
+			!atomic_read(&dcc->discard_cmd_cnt)) {
 			wait_ms = dpolicy.max_interval;
 			continue;
 		}
-		if (!atomic_read(&dcc->discard_cmd_cnt))
-			continue;
 
 		sb_start_intwrite(sbi->sb);
 
@@ -1727,6 +1723,8 @@ static int issue_discard_thread(void *data)
 		} else {
 			wait_ms = dpolicy.max_interval;
 		}
+		if (!atomic_read(&dcc->discard_cmd_cnt))
+			wait_ms = dpolicy.max_interval;
 
 		sb_end_intwrite(sbi->sb);