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md-cluster/bitmap: unplug bitmap to sync dirty pages to disk 

This patch is doing two distinct but related things.

1. It adds bitmap_unplug() for the main bitmap (mddev->bitmap).  As bit
have been set, BITMAP_PAGE_DIRTY is set so bitmap_deamon_work() will
not write those pages out in its regular scans, only bitmap_unplug()
will.  If there are no writes to the array, bitmap_unplug() won't be
called, so we need to call it explicitly here.

2. bitmap_write_all() is a bit of a confusing interface as it doesn't
actually write anything.  The current code for writing "bitmap" works
but this change makes it a bit clearer.

Reviewed-by: NeilBrown <neilb@suse.com>
Signed-off-by: Guoqing Jiang <gqjiang@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
Guoqing Jiang 2016-05-02 11:50:15 -04:00 committed by Shaohua Li
parent 23cea66a37
commit c84400c89f
1 changed files with 5 additions and 5 deletions
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10
drivers/md/bitmap.c
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@ -1924,14 +1924,14 @@ int bitmap_copy_from_slot(struct mddev *mddev, int slot,
if (clear_bits) {
bitmap_update_sb(bitmap);
/* Setting this for the ev_page should be enough.
* And we do not require both write_all and PAGE_DIRT either
*/
/* BITMAP_PAGE_PENDING is set, but bitmap_unplug needs
* BITMAP_PAGE_DIRTY or _NEEDWRITE to write ... */
for (i = 0; i < bitmap->storage.file_pages; i++)
set_page_attr(bitmap, i, BITMAP_PAGE_DIRTY);
bitmap_write_all(bitmap);
if (test_page_attr(bitmap, i, BITMAP_PAGE_PENDING))
set_page_attr(bitmap, i, BITMAP_PAGE_NEEDWRITE);
bitmap_unplug(bitmap);
}
bitmap_unplug(mddev->bitmap);
*low = lo;
*high = hi;
err: