Re: Device loses barrier support

From: Eric Sandeen
Date: Thu Dec 04 2008 - 22:27:27 EST

Mikulas Patocka wrote:

> Another thing:
> I'm wondering, where in fsync() does Linux wait for hardware disk cache to
> be flushed? Isn't there a bug that fsync() will return before the cache is
> flushed? I couldn't really find it. The last thing do_fsync calls is
> filemap_fdatawait and it doesn't do cache flush (blkdev_issue_flush).

ext4, reiserfs, and xfs all call blkdev_issue_flush() in their ->fsync
file operations (or down that path).

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at