NeilBrown
d094d6860b
md/raid10: add rcu protection to rdev access during reshape.
...
mirrors[].rdev can become NULL at any point unless:
- a counted reference is held
- ->reconfig_mutex is held, or
- rcu_read_lock() is held
Reshape isn't always suitably careful as in the past rdev couldn't be
removed during reshape. It can now, so add protection.
Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>
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