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current->bio_list will be set under submit_bio() context, in this case bitmap io will be added to the list and wait for current io submission to finish, while current io submission must wait for bitmap io to be done. commit874807a831("md/raid1{,0}: fix deadlock in bitmap_unplug.") fix the deadlock by handling plugged bio by daemon thread. On the one hand, the deadlock won't exist after commita214b949d8("blk-mq: only flush requests from the plug in blk_mq_submit_bio"). On the other hand, current solution makes it impossible to flush plugged bio in raid1/10_make_request(), because this will cause that all the writes will goto daemon thread. In order to limit the number of plugged bio, commit874807a831("md/raid1{,0}: fix deadlock in bitmap_unplug.") is reverted, and the deadlock is fixed by handling bitmap io asynchronously. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Signed-off-by: Song Liu <song@kernel.org> Link: https://lore.kernel.org/r/20230529131106.2123367-7-yukuai1@huaweicloud.com
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.