0512a75b98
Define REQ_OP_ZONE_APPEND to append-write sectors to a zone of a zoned block device. This is a no-merge write operation. A zone append write BIO must: * Target a zoned block device * Have a sector position indicating the start sector of the target zone * The target zone must be a sequential write zone * The BIO must not cross a zone boundary * The BIO size must not be split to ensure that a single range of LBAs is written with a single command. Implement these checks in generic_make_request_checks() using the helper function blk_check_zone_append(). To avoid write append BIO splitting, introduce the new max_zone_append_sectors queue limit attribute and ensure that a BIO size is always lower than this limit. Export this new limit through sysfs and check these limits in bio_full(). Also when a LLDD can't dispatch a request to a specific zone, it will return BLK_STS_ZONE_RESOURCE indicating this request needs to be delayed, e.g. because the zone it will be dispatched to is still write-locked. If this happens set the request aside in a local list to continue trying dispatching requests such as READ requests or a WRITE/ZONE_APPEND requests targetting other zones. This way we can still keep a high queue depth without starving other requests even if one request can't be served due to zone write-locking. Finally, make sure that the bio sector position indicates the actual write position as indicated by the device on completion. Signed-off-by: Keith Busch <kbusch@kernel.org> [ jth: added zone-append specific add_page and merge_page helpers ] Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.de> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> |
||
---|---|---|
.. | ||
partitions | ||
badblocks.c | ||
bfq-cgroup.c | ||
bfq-iosched.c | ||
bfq-iosched.h | ||
bfq-wf2q.c | ||
bio-integrity.c | ||
bio.c | ||
blk-cgroup-rwstat.c | ||
blk-cgroup-rwstat.h | ||
blk-cgroup.c | ||
blk-core.c | ||
blk-exec.c | ||
blk-flush.c | ||
blk-integrity.c | ||
blk-ioc.c | ||
blk-iocost.c | ||
blk-iolatency.c | ||
blk-lib.c | ||
blk-map.c | ||
blk-merge.c | ||
blk-mq-cpumap.c | ||
blk-mq-debugfs-zoned.c | ||
blk-mq-debugfs.c | ||
blk-mq-debugfs.h | ||
blk-mq-pci.c | ||
blk-mq-rdma.c | ||
blk-mq-sched.c | ||
blk-mq-sched.h | ||
blk-mq-sysfs.c | ||
blk-mq-tag.c | ||
blk-mq-tag.h | ||
blk-mq-virtio.c | ||
blk-mq.c | ||
blk-mq.h | ||
blk-pm.c | ||
blk-pm.h | ||
blk-rq-qos.c | ||
blk-rq-qos.h | ||
blk-settings.c | ||
blk-softirq.c | ||
blk-stat.c | ||
blk-stat.h | ||
blk-sysfs.c | ||
blk-throttle.c | ||
blk-timeout.c | ||
blk-wbt.c | ||
blk-wbt.h | ||
blk-zoned.c | ||
blk.h | ||
bounce.c | ||
bsg-lib.c | ||
bsg.c | ||
cmdline-parser.c | ||
elevator.c | ||
genhd.c | ||
ioctl.c | ||
ioprio.c | ||
Kconfig | ||
Kconfig.iosched | ||
kyber-iosched.c | ||
Makefile | ||
mq-deadline.c | ||
opal_proto.h | ||
scsi_ioctl.c | ||
sed-opal.c | ||
t10-pi.c |