On 5/20/21 6:22 AM, Damien Le Moal wrote:
SCSI, ZNS and null_blk zoned devices support resetting all zones using a single command (REQ_OP_ZONE_RESET_ALL), as indicated using the device request queue flag QUEUE_FLAG_ZONE_RESETALL. This flag is not set for device mapper targets creating zoned devices. In this case, a user request for resetting all zones of a device is processed in blkdev_zone_mgmt() by issuing a REQ_OP_ZONE_RESET operation for each zone of the device. This leads to different behaviors of the BLKRESETZONE ioctl() depending on the target device support for the reset all operation. E.g. blkzone reset /dev/sdX will reset all zones of a SCSI device using a single command that will ignore conventional, read-only or offline zones. But a dm-linear device including conventional, read-only or offline zones cannot be reset in the same manner as some of the single zone reset operations issued by blkdev_zone_mgmt() will fail. E.g.: blkzone reset /dev/dm-Y blkzone: /dev/dm-0: BLKRESETZONE ioctl failed: Remote I/O error To simplify applications and tools development, unify the behavior of the all-zone reset operation by modifying blkdev_zone_mgmt() to not issue a zone reset operation for conventional, read-only and offline zones, thus mimicking what an actual reset-all device command does on a device supporting REQ_OP_ZONE_RESET_ALL. This emulation is done using the new function blkdev_zone_reset_all_emulated(). The zones needing a reset are identified using a bitmap that is initialized using a zone report. Since empty zones do not need a reset, also ignore these zones. The function blkdev_zone_reset_all() is introduced for block devices natively supporting reset all operations. blkdev_zone_mgmt() is modified to call either function to execute an all zone reset request. Signed-off-by: Damien Le Moal <damien.lemoal@xxxxxxx> [hch: split into multiple functions] Signed-off-by: Christoph Hellwig <hch@xxxxxx> --- block/blk-zoned.c | 117 +++++++++++++++++++++++++++++++++++----------- 1 file changed, 90 insertions(+), 27 deletions(-) Reviewed-by: Hannes Reinecke <hare@xxxxxxx>
Cheers, Hannes -- Dr. Hannes Reinecke Kernel Storage Architect hare@xxxxxxx +49 911 74053 688 SUSE Software Solutions GmbH, Maxfeldstr. 5, 90409 Nürnberg HRB 36809 (AG Nürnberg), Geschäftsführer: Felix Imendörffer
