An AIO read or write should return -EINVAL if the offset is negative.
This check matches the one in pread and pwrite.

This was found by the libaio test suite.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
---
 fs/aio.c |    4 ++++
 1 file changed, 4 insertions(+)

diff -r 18802689361a fs/aio.c
--- a/fs/aio.c	Thu Jan 03 15:22:24 2008 +1100
+++ b/fs/aio.c	Thu Jan 03 18:05:25 2008 +1100
@@ -1330,6 +1330,10 @@ static ssize_t aio_rw_vect_retry(struct 
 		opcode = IOCB_CMD_PWRITEV;
 	}
 
+	/* This matches the pread()/pwrite() logic */
+	if (iocb->ki_pos < 0)
+		return -EINVAL;
+
 	do {
 		ret = rw_op(iocb, &iocb->ki_iovec[iocb->ki_cur_seg],
 			    iocb->ki_nr_segs - iocb->ki_cur_seg,