Christoph Hellwig 9966afaf91
dm: fix REQ_RAHEAD handling ...
A few (but not all) dm targets use a special EWOULDBLOCK error code for
failing REQ_RAHEAD requests that fail due to a lack of available resources.
But no one else knows about this magic code, and lower level drivers also
don't generate it when failing read-ahead requests for similar reasons.
So remove this special casing and ignore all additional error handling for
REQ_RAHEAD - if this was a real underlying error we'd get a normal read
once the real read comes in.
Signed-off-by: Christoph Hellwig <hch@lst.de >
Reviewed-by: Bart Van Assche <Bart.VanAssche@sandisk.com >
Signed-off-by: Mike Snitzer <snitzer@redhat.com >
Signed-off-by: Jens Axboe <axboe@fb.com >
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9966afaf91