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    SubjectRe: Question about synchronous write on SSD
    Hi,

    Le Tue, 19 Feb 2008 14:48:18 +0900,
    "Kyungmin Park" <kmpark@infradead.org> a écrit :

    > + /* Write synchronous */
    > + bio->bi_rw |= (1 << BIO_RW_SYNC);

    Adding BIO_RW_SYNC doesn't make generic_make_request() synchronous as
    in "generic_make_request() returns only after write completion".
    BIO_RW_SYNC only asks the I/O layer to unplug immediatly. But
    generic_make_request() still returns before the completion of the I/O,
    and the completion is notified asynchronously.

    See:
    http://lxr.free-electrons.com/source/include/linux/bio.h#139

    Sincerly,

    Thomas
    --
    Thomas Petazzoni, Free Electrons
    Free Embedded Linux Training Materials
    on http://free-electrons.com/training
    (More than 1500 pages!)
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