From f562146a3daf6aa0bbf2a1bc4b6b7da031ed5dcd Mon Sep 17 00:00:00 2001
From: Namjae Jeon <linkinjeon@gmail.com>
Date: Mon, 17 Dec 2012 16:02:56 -0800
Subject: [PATCH] fat: notify when discard is not supported
Change fatfs so that a warning is emitted when an attempt is made to mount
a filesystem with the unsupported `discard' option.
ext4 aready does this: http://patchwork.ozlabs.org/patch/192668/
Signed-off-by: Namjae Jeon <linkinjeon@gmail.com>
Signed-off-by: Amit Sahrawat <amit.sahrawat83@gmail.com>
Acked-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
fs/fat/inode.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 5bafaad00530..7b186a5d51b1 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"
@@ -1431,6 +1432,14 @@ 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: