md: introduce mddev_create/destroy_wb_pool for the change of member device

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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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Guoqing Jiang 2019-06-14 17:10:36 +08:00 • committed by Song Liu

parent 3e148a3209

commit 963c555e75

2 changed files with 67 additions and 0 deletions

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65

drivers/md/md.c

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2

drivers/md/md.h

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