linux-kernel - [PATCH v3 md-6.15 00/11] md/md-bitmap: introduce CONFIG_MD

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Message-Id: <20250123020730.2003602-1-yukuai1@huaweicloud.com>
Date: Thu, 23 Jan 2025 10:07:19 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: song@...nel.org,
	yukuai3@...wei.com,
	agk@...hat.com,
	snitzer@...nel.org,
	mpatocka@...hat.com
Cc: linux-raid@...r.kernel.org,
	dm-devel@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	yukuai1@...weicloud.com,
	yi.zhang@...wei.com,
	yangerkun@...wei.com
Subject: [PATCH v3 md-6.15 00/11] md/md-bitmap: introduce CONFIG_MD_BITMAP

From: Yu Kuai <yukuai3@...wei.com>

Changes in v2:
 - don't export apis, and don't support build md-bitmap as module
Changes in v3:
 - update commit message.

Due to known performance issues with md-bitmap and the unreasonable
implementations like following:

 - self-managed pages, bitmap_storage->filemap;
 - self-managed IO submitting like filemap_write_page();
 - global spin_lock
 ...

I have decided not to continue optimizing based on the current bitmap
implementation, and plan to invent a new lock-less bitmap. And a new
kconfig option is a good way for isolation. However, we still
encourage anyone who wants to continue optimizing the current
implementation, the new bitmap will take some time to be ready.

Yu Kuai (11):
  md/md-bitmap: remove the parameter 'init' for bitmap_ops->resize()
  md/md-bitmap: merge md_bitmap_group into bitmap_operations
  md/md-bitmap: add md_bitmap_registered/enabled() helper
  md/md-bitmap: handle the case bitmap is not enabled before
    start_sync()
  md/md-bitmap: handle the case bitmap is not enabled before end_sync()
  md/raid1: check bitmap before behind write
  md/raid1: check before deferencing mddev->bitmap_ops
  md/raid10: check before deferencing mddev->bitmap_ops
  md/raid5: check before deferencing mddev->bitmap_ops
  md: check before deferencing mddev->bitmap_ops
  md/md-bitmap: introduce CONFIG_MD_BITMAP

 drivers/md/Kconfig      |  18 +++++
 drivers/md/dm-raid.c    |   2 +-
 drivers/md/md-bitmap.c  |  65 ++++++++---------
 drivers/md/md-bitmap.h  |  66 +++++++++++++++--
 drivers/md/md-cluster.c |   2 +-
 drivers/md/md.c         | 154 +++++++++++++++++++++++++++++++---------
 drivers/md/md.h         |   2 -
 drivers/md/raid1-10.c   |   2 +-
 drivers/md/raid1.c      |  79 ++++++++++++---------
 drivers/md/raid10.c     |  48 ++++++-------
 drivers/md/raid5.c      |  30 ++++----
 11 files changed, 322 insertions(+), 146 deletions(-)

-- 
2.39.2