The patch titled
Subject: fat: notify when discard is not supported
has been added to the -mm tree. Its filename is
fat-notify-when-discard-is-not-supported.patch
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------------------------------------------------------
From: Namjae Jeon <linkinjeon@xxxxxxxxx>
Subject: 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@xxxxxxxxx>
Signed-off-by: Amit Sahrawat <amit.sahrawat83@xxxxxxxxx>
Acked-by: OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/fat/inode.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff -puN fs/fat/inode.c~fat-notify-when-discard-is-not-supported fs/fat/inode.c
--- a/fs/fat/inode.c~fat-notify-when-discard-is-not-supported
+++ a/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 *s
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:
_
Patches currently in -mm which might be from linkinjeon@xxxxxxxxx are
linux-next.patch
writeback-remove-nr_pages_dirtied-arg-from-balance_dirty_pages_ratelimited_nr.patch
fat-notify-when-discard-is-not-supported.patch
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