[PATCH v2 2/3] fat: notify when discard is not supported

[Namjae Jeon]

FAT also notify warning message about discard support
as ext4(http://patchwork.ozlabs.org/patch/192668/)

Signed-off-by: Namjae Jeon <linkinjeon@xxxxxxxxx>
Signed-off-by: Amit Sahrawat <amit.sahrawat83@xxxxxxxxx>
---
 fs/fat/inode.c |    9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 8d79657..3b48bab 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -26,6 +26,7 @@
 #include <linux/writeback.h>
 #include <linux/log2.h>
 #include <linux/hash.h>
+#include <linux/blkdev.h>
 #include <asm/unaligned.h>
 #include "fat.h"
 
@@ -1446,6 +1447,14 @@ int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat,
 		goto out_fail;
 	}
 
+	if (sbi->options.discard) {
+		struct request_queue *q = bdev_get_queue(sb->s_bdev);
+		if (!blk_queue_discard(q))
+			fat_msg(sb, KERN_WARNING,
+					"mounting with \"discard\" option, but "
+					"the device does not support discard");
+	}
+
 	return 0;
 
 out_invalid:
-- 
1.7.9.5

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