Martin K. Petersen d93ba7a5a9 block: Add discard flag to blkdev_issue_zeroout() function ... blkdev_issue_discard() will zero a given block range. This is done by way of explicit writing, thus provisioning or allocating the blocks on disk. There are use cases where the desired behavior is to zero the blocks but unprovision them if possible. The blocks must deterministically contain zeroes when they are subsequently read back. This patch adds a flag to blkdev_issue_zeroout() that provides this variant. If the discard flag is set and a block device guarantees discard_zeroes_data we will use REQ_DISCARD to clear the block range. If the device does not support discard_zeroes_data or if the discard request fails we will fall back to first REQ_WRITE_SAME and then a regular REQ_WRITE. Also update the callers of blkdev_issue_zero() to reflect the new flag and make sb_issue_zeroout() prefer the discard approach. Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@fb.com>		2015-01-21 10:41:46 -07:00
..
partitions	block: Replace strnicmp with strncasecmp	2014-09-27 16:48:55 -06:00
bio-integrity.c	block: fix regression where bio_integrity_process uses wrong bio_vec iterator	2014-12-02 08:15:21 -07:00
bio.c	bio: modify __bio_add_page() to accept pages that don't start a new segment	2014-12-11 09:11:52 -07:00
blk-cgroup.c	blkcg: remove blkcg->id	2014-09-08 09:55:37 -06:00
blk-cgroup.h	blkcg: remove blkcg->id	2014-09-08 09:55:37 -06:00
blk-core.c	block: wake up waiters when a queue is marked dying	2014-12-31 09:39:16 -07:00
blk-exec.c	blk-mq: avoid infinite recursion with the FUA flag	2014-09-22 11:55:19 -06:00
blk-flush.c	blk-mq: support per-distpatch_queue flush machinery	2014-09-25 15:22:45 -06:00
blk-integrity.c	block: Don't merge requests if integrity flags differ	2014-09-27 09:14:57 -06:00
blk-ioc.c	block: Substitute rcu_access_pointer() for rcu_dereference_raw()	2014-02-18 12:21:26 -08:00
blk-iopoll.c	Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into next	2014-06-03 12:57:53 -07:00
blk-lib.c	block: Add discard flag to blkdev_issue_zeroout() function	2015-01-21 10:41:46 -07:00
blk-map.c	block: remove struct request buffer member	2014-04-15 14:03:02 -06:00
blk-merge.c	block: blk-merge: fix blk_recount_segments()	2014-11-11 16:24:15 -07:00
blk-mq-cpu.c	blk-mq: add file comments and update copyright notices	2014-05-28 10:15:41 -06:00
blk-mq-cpumap.c	blk-mq: Use all available hardware queues	2014-12-09 09:08:21 -07:00
blk-mq-sysfs.c	blk-mq: Fix uninitialized kobject at CPU hotplugging	2014-12-10 08:57:31 -07:00
blk-mq-tag.c	blk-mq: fix false negative out-of-tags condition	2015-01-14 08:49:55 -07:00
blk-mq-tag.h	block: wake up waiters when a queue is marked dying	2014-12-31 09:39:16 -07:00
blk-mq.c	blk-mq: export blk_mq_freeze_queue()	2015-01-02 15:05:12 -07:00
blk-mq.h	block: wake up waiters when a queue is marked dying	2014-12-31 09:39:16 -07:00
blk-settings.c	block: remove artifical max_hw_sectors cap	2014-10-21 14:02:54 -06:00
blk-softirq.c	block: fix regression with block enabled tagging	2014-04-09 21:54:06 -06:00
blk-sysfs.c	blk-mq: Fix a use-after-free	2014-12-09 09:07:13 -07:00
blk-tag.c	block: don't assume last put of shared tags is for the host	2014-07-08 12:25:28 +02:00
blk-throttle.c	cgroup: remove sane_behavior support on non-default hierarchies	2014-07-09 10:08:08 -04:00
blk-timeout.c	block: fix blk_abort_request on blk-mq	2014-09-22 12:00:08 -06:00
blk.h	blk-mq: support per-distpatch_queue flush machinery	2014-09-25 15:22:45 -06:00
bounce.c	mm: convert some level-less printks to pr_*	2014-06-06 16:08:18 -07:00
bsg-lib.c	bsg: Remove unused function bsg_goose_queue()	2012-12-06 14:33:02 +01:00
bsg.c	bsg: fix potential error pointer dereference	2014-08-29 08:34:14 -06:00
cfq-iosched.c	cfq-iosched: fix incorrect filing of rt async cfqq	2015-01-21 10:38:30 -07:00
cmdline-parser.c	block: remove unrelated header files and export symbol	2014-01-21 20:18:26 -08:00
compat_ioctl.c	block, bdi: an active gendisk always has a request_queue associated with it	2014-09-08 10:00:35 -06:00
deadline-iosched.c	block: Stop abusing csd.list for fifo_time	2014-02-24 14:46:32 -08:00
elevator.c	block / PM: Replace CONFIG_PM_RUNTIME with CONFIG_PM	2014-12-04 01:00:23 +01:00
genhd.c	genhd: check for int overflow in disk_expand_part_tbl()	2014-11-19 13:09:07 -07:00
ioctl.c	block: Add discard flag to blkdev_issue_zeroout() function	2015-01-21 10:41:46 -07:00
ioprio.c	block: Fix computation of merged request priority	2014-10-31 08:30:43 -06:00
Kconfig	block: Add T10 Protection Information functions	2014-09-27 09:14:59 -06:00
Kconfig.iosched	blkcg: make CONFIG_BLK_CGROUP bool	2012-03-06 21:27:21 +01:00
Makefile	block: Add T10 Protection Information functions	2014-09-27 09:14:59 -06:00
noop-iosched.c	elevator: Fix a race in elevator switching	2013-07-03 13:25:24 +02:00
partition-generic.c	block: Fix dev_t minor allocation lifetime	2014-09-03 15:01:02 -06:00
scsi_ioctl.c	Merge remote-tracking branch 'scsi-queue/core-for-3.19' into for-linus	2014-12-08 07:40:20 -08:00
t10-pi.c	block: Add T10 Protection Information functions	2014-09-27 09:14:59 -06:00