Darrick J. Wong efcfec579f
loop: fix no-unmap write-zeroes request behavior ...
Currently, if the loop device receives a WRITE_ZEROES request, it asks
the underlying filesystem to punch out the range. This behavior is
correct if unmapping is allowed. However, a NOUNMAP request means that
the caller doesn't want us to free the storage backing the range, so
punching out the range is incorrect behavior.
To satisfy a NOUNMAP | WRITE_ZEROES request, loop should ask the
underlying filesystem to FALLOC_FL_ZERO_RANGE, which is (according to
the fallocate documentation) required to ensure that the entire range is
backed by real storage, which suffices for our purposes.
Fixes: 19372e2769darrick.wong@oracle.com >
Reviewed-by: Christoph Hellwig <hch@lst.de >
Signed-off-by: Jens Axboe <axboe@kernel.dk >
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