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Before this patch, for read-only array: md_check_recovery() check that 'MD_RECOVERY_NEEDED' is set, then it will call remove_and_add_spares() directly to try to remove and add rdevs from array. After this patch: 1) md_check_recovery() check that 'MD_RECOVERY_NEEDED' is set, and the worker 'sync_work' is not pending, and there are rdevs can be added or removed, then it will queue new work md_start_sync(); 2) md_start_sync() will call remove_and_add_spares() and exist; This change make sure that array reconfiguration is independent from daemon, and it'll be much easier to synchronize it with io, consier that io may rely on daemon thread to be done. Also fix a problem that 'pers->spars_active' is called after remove_and_add_spares(), which order is wrong, because spares must active first, and then remove_and_add_spares() can add spares to the array, like what read-write case does: 1) daemon set 'MD_RECOVERY_RUNNING', register new sync thread to do recovery; 2) recovery is done, md_do_sync() set 'MD_RECOVERY_DONE' before return; 3) daemon call 'pers->spars_active', and clear 'MD_RECOVERY_RUNNING'; 4) in the next round of daemon, call remove_and_add_spares() to add spares to the array. Signed-off-by: Yu Kuai <yukuai3@huawei.com> Signed-off-by: Song Liu <song@kernel.org> Link: https://lore.kernel.org/r/20230825031622.1530464-8-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.