Tags: naota/linux
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dm: split write BIOs on zone boundaries when zone append is not emulated Commit 2df7168 ("dm: Always split write BIOs to zoned device limits") updates the device-mapper driver to perform splits for the write BIOs. However, it did not address the cases where DM targets do not emulate zone append, such as in the cases of dm-linear or dm-flakey. For these targets, when the write BIOs span across zone boundaries, they trigger WARN_ON_ONCE(bio_straddles_zones(bio)) in blk_zone_wplug_handle_write(). This results in I/O errors. The errors are reproduced by running blktests test case zbd/004 using zoned dm-linear or dm-flakey devices. To avoid the I/O errors, handle the write BIOs regardless whether DM targets emulate zone append or not, so that all write BIOs are split at zone boundaries. For that purpose, drop the check for zone append emulation in dm_zone_bio_needs_split(). Its argument 'md' is no longer used then drop it also. Fixes: 2df7168 ("dm: Always split write BIOs to zoned device limits") Signed-off-by: Shin'ichiro Kawasaki <[email protected]> Reviewed-by: Damien Le Moal <[email protected]>
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