Commit f562146a authored by Namjae Jeon's avatar Namjae Jeon Committed by Linus Torvalds

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: 's avatarNamjae Jeon <>
Signed-off-by: 's avatarAmit Sahrawat <>
Acked-by: 's avatarOGAWA Hirofumi <>
Signed-off-by: 's avatarAndrew Morton <>
Signed-off-by: 's avatarLinus Torvalds <>
parent 6920d996
......@@ -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;
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