path: root/block
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authorChristoph Hellwig <>2016-10-20 15:12:15 +0200
committerJens Axboe <>2016-10-28 08:48:54 -0600
commit87374179c535a98337569904727aa02f960fe79e (patch)
tree6c71566fb8bda79fbf683e60e207739cbae50bad /block
parentef295ecf090d3e86e5b742fc6ab34f1122a43773 (diff)
block: add a proper block layer data direction encoding
Currently the block layer op_is_write, bio_data_dir and rq_data_dir helper treat every operation that is not a READ as a data out operation. This worked surprisingly long, but the new REQ_OP_ZONE_REPORT operation actually adds a second operation that reads data from the device. Surprisingly nothing critical relied on this direction, but this might be a good opportunity to properly fix this issue up. We take a little inspiration and use the least significant bit of the operation number to encode the data direction, which just requires us to renumber the operations to fix this scheme. Signed-off-by: Christoph Hellwig <> Reviewed-by: Shaun Tancheff <> Signed-off-by: Jens Axboe <>
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