fs/block_dev.c: fix iov_shorten() criteria in blkdev_aio_read()
blkdev_aio_read() test 'size' to see if it is equal or greater than the target count we request(iocb->ki_left). If so there is no need to call iov_shorten() to reduce number of segments and the iovec's length. So the judgement should be changed to 'if (size < iocb->ki_left)' instead. Signed-off-by: Jianpeng Ma <majianpeng@gmail.com> Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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@ -1558,7 +1558,7 @@ static ssize_t blkdev_aio_read(struct kiocb *iocb, const struct iovec *iov,
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return 0;
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return 0;
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size -= pos;
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size -= pos;
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if (size < INT_MAX)
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if (size < iocb->ki_left)
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nr_segs = iov_shorten((struct iovec *)iov, nr_segs, size);
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nr_segs = iov_shorten((struct iovec *)iov, nr_segs, size);
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return generic_file_aio_read(iocb, iov, nr_segs, pos);
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return generic_file_aio_read(iocb, iov, nr_segs, pos);
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}
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}
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