Guoqing Jiang 963c555e75
md: introduce mddev_create/destroy_wb_pool for the change of member device ...
Previously, we called rdev_init_wb to avoid potential data
inconsistency when array is created.
Now, we need to call the function and create mempool if a
device is added or just be flaged as "writemostly". So
mddev_create_wb_pool is introduced and called accordingly.
And for safety reason, we mark implicit GFP_NOIO allocation
scope for create mempool during mddev_suspend/mddev_resume.
And mempool should be removed conversely after remove a
member device or its's "writemostly" flag, which is done
by call mddev_destroy_wb_pool.
Reviewed-by: NeilBrown <neilb@suse.com >
Signed-off-by: Guoqing Jiang <gqjiang@suse.com >
Signed-off-by: Song Liu <songliubraving@fb.com >
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