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    SubjectRe: [PATCH] ide barrier support, #2
    On Tue, Oct 14 2003, Andi Kleen wrote:
    > > Uh be careful! It must be WRITEBARRIER, not WRITESYNC. I think I'll kill
    > > WRITEBARRIER and just call it WRITESYNC, it's more logical. I've added
    > > the modified variant, thanks.
    > Why? The journaling just checks if the write finished and then submits
    > the dependent writes. It doesn't care about reordering.

    See the patch, WRITESYNC is used solely internally in raid1.
    WRITEBARRIER is a bitmask of BIO_RW and BIO_RW_BARRIER and that is what
    you want. I'll make that more clear. Writes will not be reordered around
    the barrier either, btw.

    > As long as WRITESYNC guarantees that the data hit disk when completed
    > then it should be ok.


    Jens Axboe

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