From d3ee456dfbed1992bcaa0096d9bc76a691b0e700 Mon Sep 17 00:00:00 2001
From: Namjae Jeon <namjae.jeon@samsung.com>
Date: Sun, 17 Mar 2013 17:26:14 +0900
Subject: [PATCH] f2fs: notify when discard is not supported

Change f2fs so that a warning is emitted when an attempt is made to
mount a filesystem with the unsupported discard option.

Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Amit Sahrawat <a.sahrawat@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
---
 fs/f2fs/super.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 1c7f595ca47c..022b32a14f34 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -21,6 +21,7 @@
 #include <linux/seq_file.h>
 #include <linux/random.h>
 #include <linux/exportfs.h>
+#include <linux/blkdev.h>
 #include <linux/f2fs_fs.h>
 
 #include "f2fs.h"
@@ -650,6 +651,14 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
 	if (err)
 		goto fail;
 
+	if (test_opt(sbi, DISCARD)) {
+		struct request_queue *q = bdev_get_queue(sb->s_bdev);
+		if (!blk_queue_discard(q))
+			f2fs_msg(sb, KERN_WARNING,
+					"mounting with \"discard\" option, but "
+					"the device does not support discard");
+	}
+
 	return 0;
 fail:
 	stop_gc_thread(sbi);
-- 
2.20.1