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    SubjectRe: [PATCH, RFC] ext4: Replace hackish ext4_mb_poll_new_transaction with commit callback
    On Thu, Oct 16, 2008 at 08:02:43PM -0400, Theodore Ts'o wrote:
    > The multiblock allocator needs to be able to release blocks (and issue
    > a blkdev discard request) when the transaction which freed those
    > blocks is committed. Previously this was done via a polling mechanism
    > when blocks are allocated or freed. A much better way of doing things
    > is to create a jbd2 callback function and attaching the list of blocks
    > to be freed directly to the transaction structure.


    Why not use journal commit callback patch from andreas
    (MID:20080929201752.GN10950@webber.adilger.int
    http://article.gmane.org/gmane.comp.file-systems.ext4/9148)

    The patch you sent will allows only one call back to be registered.

    -aneesh


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