[lkml]   [2007]   [May]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: [dm-devel] Re: [RFD] BIO_RW_BARRIER - what it means for devices, filesystems, and dm/md.
    On Mon, May 28, 2007 at 11:30:32AM +1000, Neil Brown wrote:
    > 1/ A BIO_RW_BARRIER request should never fail with -EOPNOTSUP.

    The device-mapper position has always been that we require

    > a zero-length BIO_RW_BARRIER

    (i.e. containing no data to read or write - or emulated, possibly

    before we can provide full barrier support.
    (Consider multiple active paths - each must see barrier.)

    Until every device supports barriers -EOPNOTSUP support is required.
    (Consider reconfiguration of stacks of devices - barrier support is a
    dynamic block device property that can switch between available and
    unavailable at any time.)

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

     \ /
      Last update: 2007-05-28 11:47    [W:0.045 / U:6.656 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site