Yu Kuai 6efddf1e32
md: fix soft lockup in status_resync ...
status_resync() will calculate 'curr_resync - recovery_active' to show
user a progress bar like following:
[============>........] resync = 61.4%
'curr_resync' and 'recovery_active' is updated in md_do_sync(), and
status_resync() can read them concurrently, hence it's possible that
'curr_resync - recovery_active' can overflow to a huge number. In this
case status_resync() will be stuck in the loop to print a large amount
of '=', which will end up soft lockup.
Fix the problem by setting 'resync' to MD_RESYNC_ACTIVE in this case,
this way resync in progress will be reported to user.
Signed-off-by: Yu Kuai <yukuai3@huawei.com >
Signed-off-by: Song Liu <song@kernel.org >
Link: https://lore.kernel.org/r/20230310073855.1337560-3-yukuai1@huaweicloud.com
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6efddf1e32