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    Subject[PATCH 0/4] map multiple blocks in get_block() and mpage_readpages()
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    Hi,

    Following patches add support to map multiple blocks in ->get_block().
    This is will allow us to handle mapping of multiple disk blocks for
    mpage_readpages() and mpage_writepages() etc. Instead of adding new
    argument, I use "b_size" to indicate the amount of disk mapping needed
    for get_block(). And also, on success get_block() actually indicates
    the amount of disk mapping it did.

    Now that get_block() can handle multiple blocks, there is no need
    for ->get_blocks() which was added for DIO.

    [PATCH 1/4] change buffer_head.b_size to size_t

    [PATCH 2/4] pass b_size to ->get_block()

    [PATCH 3/4] map multiple blocks for mpage_readpages()

    [PATCH 4/4] remove ->get_blocks() support

    I noticed decent improvements (reduced sys time) on JFS, XFS and ext3.
    (on simple "dd" read tests).

    (rc3.mm1) (rc3.mm1 + patches)
    real 0m18.814s 0m18.482s
    user 0m0.000s 0m0.004s
    sys 0m3.240s 0m2.912s

    Andrew, Could you include it in -mm tree ?

    Comments ?

    Thanks,
    Badari


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