Re: [PATCH v2 0/3] md/raid1,raid10: fix deadlock and bio accounting in read error path

在 2026/5/1 19:46, Abd-Alrhman Masalkhi 写道:

> Hi,
>
> This series revisits an issue in the read error recovery path for
> raid1 and raid10 when bios are split and resubmitted.
>
> In v1, the approach was to avoid splitting bios in the raid1 thread
> to prevent recursion and potential deadlocks. However, this was not
> ideal and too restrictive.
>
> As suggested by Yu Kuai, this series instead handles the problem in
> md_handle_request() and allows bio splitting.
>
> Link to Yu Kuai' email: https://lore.kernel.org/linux-raid/[email protected]/T/#m714020a38b60fc5f84b9a24f0c46acbe5d7342d6
>
> This series fixes the above by:
>   - handling md cloned bios explicitly in md_handle_request()
>   - using md_cloned_bio() to reliably detect the error path
>   - fixing bio accounting to avoid double/missing accounting
>
> Changes in v2:
>   - Split fixes into separate patches for clarity.
>   - Use md_cloned_bio() consistently to detect cloned bios.
>   - Recognize that raid10 has the same issue and fix it in this series	
>   - Allow splitting bios.
>   - Handle md cloned bios explicitly in md_handle_request()
>   - Link v1: https://lore.kernel.org/linux-raid/[email protected]/
>
> Abd-Alrhman Masalkhi (3):
>    md/raid1,raid10: fix deadlock in read error recovery path
>    md/raid1,raid10: fix error-path detection with md_cloned_bio()
>    md/raid1,raid10: fix bio accounting for split md cloned bios
>
>   drivers/md/md.c     | 25 ++++++++++++++++---------
>   drivers/md/md.h     |  5 +++++
>   drivers/md/raid1.c  | 15 +++++++++++----
>   drivers/md/raid10.c | 28 ++++++++++++++++++----------
>   4 files changed, 50 insertions(+), 23 deletions(-)

Applied to md-7.2

>
-- 
Thansk,
Kuai