linux-kernel - [PATCH] f2fs: issue discard commands if gc

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Date:   Mon, 21 Aug 2017 13:56:47 -0700
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Cc:     Jaegeuk Kim <jaegeuk@...nel.org>
Subject: [PATCH] f2fs: issue discard commands if gc_urgent is set

It's time to issue all the discard commands, if user sets the idle time.

Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
---
 fs/f2fs/segment.c | 6 +++++-
 fs/f2fs/sysfs.c   | 5 +++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 1387925a0d83..e3922f902c8c 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -21,6 +21,7 @@
 #include "f2fs.h"
 #include "segment.h"
 #include "node.h"
+#include "gc.h"
 #include "trace.h"
 #include <trace/events/f2fs.h>
 
@@ -1194,8 +1195,11 @@ static int issue_discard_thread(void *data)
 		if (kthread_should_stop())
 			return 0;
 
-		if (dcc->discard_wake)
+		if (dcc->discard_wake) {
 			dcc->discard_wake = 0;
+			if (sbi->gc_thread && sbi->gc_thread->gc_urgent)
+				mark_discard_range_all(sbi);
+		}
 
 		sb_start_intwrite(sbi->sb);
 
diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
index 4bcaa9059026..b9ad9041559f 100644
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -178,8 +178,13 @@ static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
 	if (!strcmp(a->attr.name, "iostat_enable") && *ui == 0)
 		f2fs_reset_iostat(sbi);
 	if (!strcmp(a->attr.name, "gc_urgent") && t == 1 && sbi->gc_thread) {
+		struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
+
 		sbi->gc_thread->gc_wake = 1;
 		wake_up_interruptible_all(&sbi->gc_thread->gc_wait_queue_head);
+
+		dcc->discard_wake = 1;
+		wake_up_interruptible_all(&dcc->discard_wait_queue);
 	}
 
 	return count;
-- 
2.14.0.rc1.383.gd1ce394fe2-goog