f2fs: notify when discard is not supported

Change f2fs so that a warning is emitted when an attempt is made to
mount a filesystem with the unsupported discard option.

Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Amit Sahrawat <a.sahrawat@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 1c7f595..022b32a 100644 (file)
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -21,6 +21,7 @@
 #include <linux/seq_file.h>
 #include <linux/random.h>
 #include <linux/exportfs.h>
+#include <linux/blkdev.h>
 #include <linux/f2fs_fs.h>
 
 #include "f2fs.h"
@@ -650,6 +651,14 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
        if (err)
                goto fail;
 
+       if (test_opt(sbi, DISCARD)) {
+               struct request_queue *q = bdev_get_queue(sb->s_bdev);
+               if (!blk_queue_discard(q))
+                       f2fs_msg(sb, KERN_WARNING,
+                                       "mounting with \"discard\" option, but "
+                                       "the device does not support discard");
+       }
+
        return 0;
 fail:
        stop_gc_thread(sbi);