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    Subject[PATCH 11/17] block: kill blk_end_request_callback()
    Date
    Impact: removal of unused convoluted interface

    With recent IDE updates, blk_end_request_callback() doesn't have any
    user now. Kill it.

    Signed-off-by: Tejun Heo <tj@kernel.org>
    ---
    block/blk-core.c | 48 +++---------------------------------------------
    include/linux/blkdev.h | 3 ---
    2 files changed, 3 insertions(+), 48 deletions(-)

    diff --git a/block/blk-core.c b/block/blk-core.c
    index 0d97fbe..9595c4f 100644
    --- a/block/blk-core.c
    +++ b/block/blk-core.c
    @@ -1957,10 +1957,6 @@ static void end_that_request_last(struct request *req, int error)
    * @error: %0 for success, < %0 for error
    * @nr_bytes: number of bytes to complete @rq
    * @bidi_bytes: number of bytes to complete @rq->next_rq
    - * @drv_callback: function called between completion of bios in the request
    - * and completion of the request.
    - * If the callback returns non %0, this helper returns without
    - * completion of the request.
    *
    * Description:
    * Ends I/O on a number of bytes attached to @rq and @rq->next_rq.
    @@ -1971,8 +1967,7 @@ static void end_that_request_last(struct request *req, int error)
    * %1 - this request is not freed yet, it still has pending buffers.
    **/
    static int blk_end_io(struct request *rq, int error, unsigned int nr_bytes,
    - unsigned int bidi_bytes,
    - int (drv_callback)(struct request *))
    + unsigned int bidi_bytes)
    {
    struct request_queue *q = rq->q;
    unsigned long flags = 0UL;
    @@ -1980,10 +1975,6 @@ static int blk_end_io(struct request *rq, int error, unsigned int nr_bytes,
    if (end_that_request_data(rq, error, nr_bytes, bidi_bytes))
    return 1;

    - /* Special feature for tricky drivers */
    - if (drv_callback && drv_callback(rq))
    - return 1;
    -
    add_disk_randomness(rq->rq_disk);

    spin_lock_irqsave(q->queue_lock, flags);
    @@ -2009,7 +2000,7 @@ static int blk_end_io(struct request *rq, int error, unsigned int nr_bytes,
    **/
    int blk_end_request(struct request *rq, int error, unsigned int nr_bytes)
    {
    - return blk_end_io(rq, error, nr_bytes, 0, NULL);
    + return blk_end_io(rq, error, nr_bytes, 0);
    }
    EXPORT_SYMBOL_GPL(blk_end_request);

    @@ -2056,7 +2047,7 @@ EXPORT_SYMBOL_GPL(__blk_end_request);
    int blk_end_bidi_request(struct request *rq, int error, unsigned int nr_bytes,
    unsigned int bidi_bytes)
    {
    - return blk_end_io(rq, error, nr_bytes, bidi_bytes, NULL);
    + return blk_end_io(rq, error, nr_bytes, bidi_bytes);
    }
    EXPORT_SYMBOL_GPL(blk_end_bidi_request);

    @@ -2117,39 +2108,6 @@ void blk_update_request(struct request *rq, int error, unsigned int nr_bytes)
    }
    EXPORT_SYMBOL_GPL(blk_update_request);

    -/**
    - * blk_end_request_callback - Special helper function for tricky drivers
    - * @rq: the request being processed
    - * @error: %0 for success, < %0 for error
    - * @nr_bytes: number of bytes to complete
    - * @drv_callback: function called between completion of bios in the request
    - * and completion of the request.
    - * If the callback returns non %0, this helper returns without
    - * completion of the request.
    - *
    - * Description:
    - * Ends I/O on a number of bytes attached to @rq.
    - * If @rq has leftover, sets it up for the next range of segments.
    - *
    - * This special helper function is used only for existing tricky drivers.
    - * (e.g. cdrom_newpc_intr() of ide-cd)
    - * This interface will be removed when such drivers are rewritten.
    - * Don't use this interface in other places anymore.
    - *
    - * Return:
    - * %0 - we are done with this request
    - * %1 - this request is not freed yet.
    - * this request still has pending buffers or
    - * the driver doesn't want to finish this request yet.
    - **/
    -int blk_end_request_callback(struct request *rq, int error,
    - unsigned int nr_bytes,
    - int (drv_callback)(struct request *))
    -{
    - return blk_end_io(rq, error, nr_bytes, 0, drv_callback);
    -}
    -EXPORT_SYMBOL_GPL(blk_end_request_callback);
    -
    void blk_rq_bio_prep(struct request_queue *q, struct request *rq,
    struct bio *bio)
    {
    diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
    index cdfac4f..e8175c8 100644
    --- a/include/linux/blkdev.h
    +++ b/include/linux/blkdev.h
    @@ -833,9 +833,6 @@ extern int __blk_end_request(struct request *rq, int error,
    extern int blk_end_bidi_request(struct request *rq, int error,
    unsigned int nr_bytes, unsigned int bidi_bytes);
    extern void end_request(struct request *, int);
    -extern int blk_end_request_callback(struct request *rq, int error,
    - unsigned int nr_bytes,
    - int (drv_callback)(struct request *));
    extern void blk_complete_request(struct request *);
    extern void __blk_complete_request(struct request *);
    extern void blk_abort_request(struct request *);
    --
    1.6.0.2


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