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| author | Guoqing Jiang <gqjiang@suse.com> | 2019-06-14 17:10:37 +0800 |
|---|---|---|
| committer | Song Liu <songliubraving@fb.com> | 2019-06-20 16:36:00 -0700 |
| commit | 10c92fca636e40dcb15d85ffe06b1b6843cd28fc (patch) | |
| tree | aca8860019ebe2219e4e5edd35b4aa6ae3aeadde | |
| parent | 963c555e75b033202dd76cf6325a7b7c83d08d5f (diff) | |
| download | linux-stable-10c92fca636e40dcb15d85ffe06b1b6843cd28fc.tar.gz linux-stable-10c92fca636e40dcb15d85ffe06b1b6843cd28fc.tar.bz2 linux-stable-10c92fca636e40dcb15d85ffe06b1b6843cd28fc.zip | |
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>
| -rw-r--r-- | drivers/md/md-bitmap.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c index c01d41198f5e..15dd817fe83b 100644 --- a/drivers/md/md-bitmap.c +++ b/drivers/md/md-bitmap.c @@ -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; } |