From: Christoph Hellwig <hch@lst.de>
To: Jens Axboe <axboe@kernel.dk>, Mike Snitzer <snitzer@redhat.com>
Cc: linux-block@vger.kernel.org, dm-devel@redhat.com
Subject: [dm-devel] use regular gendisk registration in device mapper v2
Date: Wed, 4 Aug 2021 11:41:39 +0200 [thread overview]
Message-ID: <20210804094147.459763-1-hch@lst.de> (raw)
Hi all,
The device mapper code currently has a somewhat odd gendisk registration
scheme where it calls add_disk early, but uses a special flag to skip the
"queue registration", which is a major part of add_disk. This series
improves the block layer holder tracking to work on an entirely
unregistered disk and thus allows device mapper to use the normal scheme
of calling add_disk when it is ready to accept I/O.
Note that this leads to a user visible change - the sysfs attributes on
the disk and the dm directory hanging off it are not only visible once
the initial table is loaded. This did not make a different to my testing
using dmsetup and the lvm2 tools.
Changes since v1:
- rebased on the lastes for-5.15/block tree
- improve various commit messages, including commit references
Diffstat:
block/Kconfig | 4 +
block/Makefile | 1
block/elevator.c | 1
block/genhd.c | 42 +++++------
block/holder.c | 167 ++++++++++++++++++++++++++++++++++++++++++++++
drivers/md/Kconfig | 2
drivers/md/bcache/Kconfig | 1
drivers/md/dm-ioctl.c | 4 -
drivers/md/dm-rq.c | 1
drivers/md/dm.c | 32 +++-----
fs/block_dev.c | 145 ---------------------------------------
include/linux/blk_types.h | 3
include/linux/genhd.h | 19 ++---
13 files changed, 219 insertions(+), 203 deletions(-)
--
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next reply other threads:[~2021-08-04 9:47 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-04 9:41 Christoph Hellwig [this message]
2021-08-04 9:41 ` [dm-devel] [PATCH 1/8] block: make the block holder code optional Christoph Hellwig
2021-08-04 9:41 ` [dm-devel] [PATCH 2/8] block: remove the extra kobject reference in bd_link_disk_holder Christoph Hellwig
2021-08-04 9:41 ` [dm-devel] [PATCH 3/8] block: look up holders by bdev Christoph Hellwig
2021-08-04 9:41 ` [dm-devel] [PATCH 4/8] block: support delayed holder registration Christoph Hellwig
[not found] ` <CGME20210810213058eucas1p109323e3c3ecaa76d37d8cf63b6d8ecfd@eucas1p1.samsung.com>
2021-08-10 21:30 ` Marek Szyprowski
2021-08-14 21:13 ` Guenter Roeck
2021-08-15 7:07 ` Christoph Hellwig
2021-08-15 14:27 ` Guenter Roeck
2021-08-16 7:21 ` Christoph Hellwig
2021-08-16 14:17 ` Guenter Roeck
2021-08-20 15:08 ` Christoph Hellwig
2021-08-21 3:17 ` Guenter Roeck
2021-08-18 2:51 ` Guenter Roeck
2021-08-04 9:41 ` [dm-devel] [PATCH 5/8] dm: cleanup cleanup_mapped_device Christoph Hellwig
2021-08-04 9:41 ` [dm-devel] [PATCH 6/8] dm: move setting md->type into dm_setup_md_queue Christoph Hellwig
2021-08-04 9:41 ` [dm-devel] [PATCH 7/8] dm: delay registering the gendisk Christoph Hellwig
2021-08-09 23:31 ` Alasdair G Kergon
2021-08-10 0:17 ` Alasdair G Kergon
2021-08-10 13:12 ` Peter Rajnoha
2021-08-10 15:05 ` Alasdair G Kergon
2022-07-07 3:29 ` Yu Kuai
2022-07-07 5:24 ` Christoph Hellwig
2022-07-07 7:20 ` Yu Kuai
2022-07-15 3:24 ` Yu Kuai
2022-08-01 1:04 ` Yu Kuai
2021-08-04 9:41 ` [dm-devel] [PATCH 8/8] block: remove support for delayed queue registrations Christoph Hellwig
2021-08-09 17:51 ` [dm-devel] use regular gendisk registration in device mapper v2 Jens Axboe
2021-08-10 0:36 ` Alasdair G Kergon
2021-08-10 14:41 ` Alasdair G Kergon
2021-08-19 15:58 ` [dm-devel] holders not working properly, regression [was: Re: use regular gendisk registration in device mapper v2] Mike Snitzer
2021-08-19 18:05 ` Christoph Hellwig
2021-08-19 22:08 ` Mike Snitzer
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