From 79add3a3f795e688e35d5e703d5a8cfa8ef923ac Mon Sep 17 00:00:00 2001 From: Lukas Czerner Date: Thu, 8 Nov 2012 13:28:29 -0500 Subject: [PATCH] ext4: notify when discard is not supported Notify user when mounting the file system with -o discard option, but the device does not support discard. Obviously we do not want to fail the mount or disable the options, because the underlying device might change in future even without file system remount. Reviewed-by: Carlos Maiolino Signed-off-by: Lukas Czerner Signed-off-by: "Theodore Ts'o" --- fs/ext4/super.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/fs/ext4/super.c b/fs/ext4/super.c index ea21231..6729470 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -4015,6 +4015,14 @@ no_journal: } #endif /* CONFIG_QUOTA */ + if (test_opt(sb, DISCARD)) { + struct request_queue *q = bdev_get_queue(sb->s_bdev); + if (!blk_queue_discard(q)) + ext4_msg(sb, KERN_WARNING, + "mounting with \"discard\" option, but " + "the device does not support discard"); + } + ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. " "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts, *sbi->s_es->s_mount_opts ? "; " : "", orig_data); -- 2.7.4