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authorNiklas Cassel <niklas.cassel@wdc.com>2021-05-14 12:53:14 +0000
committerJens Axboe <axboe@kernel.dk>2021-05-14 08:57:31 -0600
commitd2f442bc0bd507510089d56cd510616093415702 (patch)
tree2ab78b1fea66d18c9a758d4b7f4820353889ff3d /engines/libzbc.c
parenteaa45783ef5079884f96813e74c6b450dc52d0f0 (diff)
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ioengines: add get_max_open_zones zoned block device operation
Define a new IO engine operation to get the maximum number of open zones. Like the existing IO engine operations: .get_zoned_model, .report_zones, and .reset_wp, this new IO engine operation is only valid for zoned block devices. Similarly to the other zbd IO engine operations, also provide a default implementation inside oslib/linux-blkzoned.c that will be used if the ioengine does not override it. The default Linux oslib implementation is implemented similarly to blkzoned_get_zoned_model(), i.e. it will return a successful error code even when the sysfs attribute does not exist. This is because the sysfs max_open_zones attribute was introduced first in Linux v5.9. All error handling is still there, so an ioengine that provides its own implementation will still have its error code respected properly. Signed-off-by: Niklas Cassel <niklas.cassel@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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