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

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>
alistair/sunxi64-5.4-dsi
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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14
drivers/md/md-bitmap.c
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@ -2462,12 +2462,26 @@ static ssize_t
backlog_store(struct mddev *mddev, const char *buf, size_t len)
{
unsigned long backlog;
unsigned long old_mwb = mddev->bitmap_info.max_write_behind;
int rv = kstrtoul(buf, 10, &backlog);
if (rv)
return rv;
if (backlog > COUNTER_MAX)
return -EINVAL;
mddev->bitmap_info.max_write_behind = backlog;
if (!backlog && mddev->wb_info_pool) {
/* wb_info_pool is not needed if backlog is zero */
mempool_destroy(mddev->wb_info_pool);
mddev->wb_info_pool = NULL;
} else if (backlog && !mddev->wb_info_pool) {
/* wb_info_pool is needed since backlog is not zero */
struct md_rdev *rdev;
rdev_for_each(rdev, mddev)
mddev_create_wb_pool(mddev, rdev, false);
}
if (old_mwb != backlog)
md_bitmap_update_sb(mddev->bitmap);
return len;
}