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Chaitanya Kulkarni a6f0788ec2 block: add support for REQ_OP_WRITE_ZEROES 
This adds a new block layer operation to zero out a range of
LBAs. This allows to implement zeroing for devices that don't use
either discard with a predictable zero pattern or WRITE SAME of zeroes.
The prominent example of that is NVMe with the Write Zeroes command,
but in the future, this should also help with improving the way
zeroing discards work. For this operation, suitable entry is exported in
sysfs which indicate the number of maximum bytes allowed in one
write zeroes operation by the device.

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@hgst.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
 		2016-12-01 07:58:40 -07:00
..
partitions block: atari: Return early for unsupported sector size 2016-07-13 09:31:44 -07:00
Kconfig block: hook up writeback throttling 2016-11-10 13:53:40 -07:00
Kconfig.iosched blkcg: make CONFIG_BLK_CGROUP bool 2012-03-06 21:27:21 +01:00
Makefile blk-wbt: add general throttling mechanism 2016-11-10 13:53:32 -07:00
badblocks.c block, badblocks: introduce devm_init_badblocks 2016-01-09 08:39:04 -08:00
bio-integrity.c block: remove bio_is_rw 2016-10-28 08:45:17 -06:00
bio.c block: add support for REQ_OP_WRITE_ZEROES 2016-12-01 07:58:40 -07:00
blk-cgroup.c block,blkcg: use __GFP_NOWARN for best-effort allocations in blkcg 2016-11-22 08:59:49 -07:00
blk-core.c block: add support for REQ_OP_WRITE_ZEROES 2016-12-01 07:58:40 -07:00
blk-exec.c block: split out request-only flags into a new namespace 2016-10-28 08:45:17 -06:00
blk-flush.c block: set REQ_SYNC if we clear REQ_FUA|REQ_PREFLUSH 2016-11-08 19:39:28 -07:00
blk-integrity.c block, libnvdimm, nvme: provide a built-in blk_integrity nop profile 2015-10-21 14:43:45 -06:00
blk-ioc.c mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd 2015-11-06 17:50:42 -08:00
blk-lib.c block: add support for REQ_OP_WRITE_ZEROES 2016-12-01 07:58:40 -07:00
blk-map.c block: better op and flags encoding 2016-10-28 08:48:16 -06:00
blk-merge.c block: add support for REQ_OP_WRITE_ZEROES 2016-12-01 07:58:40 -07:00
blk-mq-cpumap.c blk-mq: allow the driver to pass in a queue mapping 2016-09-15 08:42:03 -06:00
blk-mq-pci.c blk_mq: linux/blk-mq.h does not include all the headers it depends on 2016-09-19 08:21:51 -06:00
blk-mq-sysfs.c block: add scalable completion tracking of requests 2016-11-10 13:53:26 -07:00
blk-mq-tag.c Merge branch 'for-4.9/block-irq' of git://git.kernel.dk/linux-block 2016-10-09 17:29:33 -07:00
blk-mq-tag.h Merge branch 'for-4.9/block-irq' of git://git.kernel.dk/linux-block 2016-10-09 17:29:33 -07:00
blk-mq.c blk-mq: Drop explicit timeout sync in hotplug 2016-11-29 08:01:08 -07:00
blk-mq.h block: add scalable completion tracking of requests 2016-11-10 13:53:26 -07:00
blk-settings.c block: add support for REQ_OP_WRITE_ZEROES 2016-12-01 07:58:40 -07:00
blk-softirq.c This adds a new gcc plugin named "latent_entropy". It is designed to 2016-10-15 10:03:15 -07:00
blk-stat.c block: add scalable completion tracking of requests 2016-11-10 13:53:26 -07:00
blk-stat.h block: add scalable completion tracking of requests 2016-11-10 13:53:26 -07:00
blk-sysfs.c block: add support for REQ_OP_WRITE_ZEROES 2016-12-01 07:58:40 -07:00
blk-tag.c block: split out request-only flags into a new namespace 2016-10-28 08:45:17 -06:00
blk-throttle.c block: replace REQ_THROTTLED with a bio flag 2016-10-28 08:45:17 -06:00
blk-timeout.c block: remove REQ_NO_TIMEOUT flag 2015-12-22 09:38:34 -07:00
blk-wbt.c block: add support for REQ_OP_WRITE_ZEROES 2016-12-01 07:58:40 -07:00
blk-wbt.h blk-wbt: allow wbt to be enabled always through sysfs 2016-11-28 10:27:03 -07:00
blk-zoned.c block: zoned: fix harmless maybe-uninitialized warning 2016-10-24 20:51:22 -06:00
blk.h blk-mq: implement hybrid poll mode for sync O_DIRECT 2016-11-17 13:34:51 -07:00
bounce.c Merge branch 'for-linus' of git://git.kernel.dk/linux-block 2015-09-19 18:57:09 -07:00
bsg-lib.c bsg: Add sparse annotations to bsg_request_fn() 2016-11-14 09:57:03 -07:00
bsg.c block: drop q argument from bsg_validate_sgv4_hdr 2016-11-03 07:56:14 -06:00
cfq-iosched.c blk-wbt: cleanup disable-by-default for CFQ 2016-11-28 10:27:03 -07:00
cmdline-parser.c block: remove unrelated header files and export symbol 2014-01-21 20:18:26 -08:00
compat_ioctl.c mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros 2016-04-04 10:41:08 -07:00
deadline-iosched.c block: do not merge requests without consulting with io scheduler 2016-07-20 21:35:12 -06:00
elevator.c block: better op and flags encoding 2016-10-28 08:48:16 -06:00
genhd.c block: fix bdi vs gendisk lifetime mismatch 2016-08-04 14:19:16 -06:00
ioctl.c blk-zoned: implement ioctls 2016-10-18 10:05:42 -06:00
ioprio.c block: fix use-after-free in sys_ioprio_get() 2016-07-01 08:39:24 -06:00
noop-iosched.c elevator: use list_{first,prev,next}_entry 2015-11-16 15:21:48 -07:00
partition-generic.c block: Check partition alignment on zoned block devices 2016-12-01 07:56:53 -07:00
scsi_ioctl.c mm, page_alloc: rename __GFP_WAIT to __GFP_RECLAIM 2015-11-06 17:50:42 -08:00
t10-pi.c block: Consolidate static integrity profile properties 2015-10-21 14:42:38 -06:00