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>

1 files changed, 9 insertions, 0 deletions

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: