iomap: add a workaround for racy i_size updates on block devices

A szybot reproducer that does write I/O while truncating the size of a
block device can end up in clean_bdev_aliases, which tries to clean the
bdev aliases that it uses.  This is because iomap_to_bh automatically
sets the BH_New flag when outside of i_size.  For block devices updates
to i_size are racy and we can hit this case in a tiny race window,
leading to the eventual clean_bdev_aliases call.  Fix this by erroring
out of > i_size I/O on block devices.

Reported-by: [email protected]
Signed-off-by: Christoph Hellwig <[email protected]>
Tested-by: [email protected]
Reviewed-by: Darrick J. Wong <[email protected]>
Signed-off-by: Darrick J. Wong <[email protected]>

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