[RFC PATCH 0/5] md/raid1: introduce a new sync action to repair badblocks

From: Zheng Qixing <[email protected]>

In RAID1, some sectors may be marked as bad blocks due to I/O errors.
In certain scenarios, these bad blocks might not be permanent, and
issuing I/Os again could succeed.

To address this situation, a new sync action ('rectify') introduced
into RAID1 , allowing users to actively trigger the repair of existing
bad blocks and clear it in sys bad_blocks.

When echo rectify into /sys/block/md*/md/sync_action, a healthy disk is
selected from the array to read data and then writes it to the disk where
the bad block is located. If the write request succeeds, the bad block
record can be cleared.

Note:
  This patchset depends on [1] from Li Nan which is currently under review
  and not yet merged into md-6.19.

[1] [PATCH v3 00/13] cleanup and bugfix of sync
  Link: https://lore.kernel.org/all/[email protected]/

Zheng Qixing (5):
  md: add helpers for requested sync action
  md: clear stale sync flags when frozen before sync starts
  md: simplify sync action print in status_resync
  md: introduce MAX_RAID_DISKS macro to replace magic number
  md/raid1: introduce rectify action to repair badblocks

 drivers/md/md.c    | 184 ++++++++++++++++++++++-----
 drivers/md/md.h    |  17 +++
 drivers/md/raid1.c | 308 ++++++++++++++++++++++++++++++++++++++++++++-
 drivers/md/raid1.h |   1 +
 4 files changed, 472 insertions(+), 38 deletions(-)

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2.39.2