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block: fix SG_IO to return a proper error value
authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Mon, 13 Apr 2009 18:03:10 +0000 (20:03 +0200)
committerJens Axboe <jens.axboe@oracle.com>
Wed, 15 Apr 2009 10:10:11 +0000 (12:10 +0200)
blk_rq_unmap_user() returns -EFAULT if a program passes an invalid
address to kernel. SG_IO path needs to pass the returned value to user
space instead of ignoring it.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

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