linux-kernel - [PATCH] f2fs: run GCs synchronously given user requests

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Date:   Wed,  8 Jun 2022 09:21:53 -0700
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Jaegeuk Kim <jaegeuk@...nel.org>
Subject: [PATCH] f2fs: run GCs synchronously given user requests

When users set GC_URGENT or GC_MID, they expected to do GCs right away.
But, there's a condition to bypass it. Let's indicate we need to do now
in the thread.

Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
---
 fs/f2fs/gc.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index d5fb426e0747..f4aa3c88118b 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -37,7 +37,6 @@ static int gc_thread_func(void *data)
 	unsigned int wait_ms;
 	struct f2fs_gc_control gc_control = {
 		.victim_segno = NULL_SEGNO,
-		.should_migrate_blocks = false,
 		.err_gc_skipped = false };
 
 	wait_ms = gc_th->min_sleep_time;
@@ -113,7 +112,10 @@ static int gc_thread_func(void *data)
 				sbi->gc_mode == GC_URGENT_MID) {
 			wait_ms = gc_th->urgent_sleep_time;
 			f2fs_down_write(&sbi->gc_lock);
+			gc_control.should_migrate_blocks = true;
 			goto do_gc;
+		} else {
+			gc_control.should_migrate_blocks = false;
 		}
 
 		if (foreground) {
@@ -139,7 +141,9 @@ static int gc_thread_func(void *data)
 		if (!foreground)
 			stat_inc_bggc_count(sbi->stat_info);
 
-		sync_mode = F2FS_OPTION(sbi).bggc_mode == BGGC_MODE_SYNC;
+		sync_mode = F2FS_OPTION(sbi).bggc_mode == BGGC_MODE_SYNC ||
+				sbi->gc_mode == GC_URGENT_HIGH ||
+				sbi->gc_mode == GC_URGENT_MID;
 
 		/* foreground GC was been triggered via f2fs_balance_fs() */
 		if (foreground)
-- 
2.36.1.476.g0c4daa206d-goog