fs/block-dev.c:fix performance regression in O_DIRECT writes to md block devices
For regular file, write operaion used blk_plug function.But for block file,write operation did not use blk_plug. This patch is also for write-cache mode for block-device. Signed-off-by: Jianpeng Ma <majianpeng@gmail.com> Reviewed-by: NeilBrown <neilb@suse.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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@ -1578,10 +1578,12 @@ ssize_t blkdev_aio_write(struct kiocb *iocb, const struct iovec *iov,
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unsigned long nr_segs, loff_t pos)
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{
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struct file *file = iocb->ki_filp;
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struct blk_plug plug;
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ssize_t ret;
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BUG_ON(iocb->ki_pos != pos);
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blk_start_plug(&plug);
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ret = __generic_file_aio_write(iocb, iov, nr_segs, &iocb->ki_pos);
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if (ret > 0 || ret == -EIOCBQUEUED) {
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ssize_t err;
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@ -1590,6 +1592,7 @@ ssize_t blkdev_aio_write(struct kiocb *iocb, const struct iovec *iov,
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if (err < 0 && ret > 0)
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ret = err;
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}
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blk_finish_plug(&plug);
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return ret;
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}
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EXPORT_SYMBOL_GPL(blkdev_aio_write);
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