md-bitmap: create and destroy wb_info_pool with the change of backlog

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Since we can enable write-behind mode by write backlog node,
so create wb_info_pool if the mode is just enabled, also call
call md_bitmap_update_sb to make user aware the write-behind
mode is enabled. Conversely, wb_info_pool should be destroyed
when write-behind mode is disabled.

Beside above, it is better to update bitmap sb if we change
the number of max_write_behind.

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 17:10:37 +08:00 • committed by Song Liu

parent 963c555e75

commit 10c92fca63

1 changed files with 14 additions and 0 deletions

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drivers/md/md-bitmap.c

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