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).
-Eric
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