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Commit ce5f8e77 authored by Jens Axboe's avatar Jens Axboe
Browse files

writeback: splice dirty inode entries to default bdi on bdi_destroy() 



We cannot safely ensure that the inodes are all gone at this point
in time, and we must not destroy this bdi with inodes having off it.
So just splice our entries to the default bdi since that one will
always persist.

Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
parent b6e51316

mm/backing-dev.c

+13 −1
Original line number Diff line number Diff line
@@ -668,7 +668,19 @@ void bdi_destroy(struct backing_dev_info *bdi) 
{

	int i;



	WARN_ON(bdi_has_dirty_io(bdi));

	/*

	 * Splice our entries to the default_backing_dev_info, if this

	 * bdi disappears

	 */

	if (bdi_has_dirty_io(bdi)) {

		struct bdi_writeback *dst = &default_backing_dev_info.wb;



		spin_lock(&inode_lock);

		list_splice(&bdi->wb.b_dirty, &dst->b_dirty);

		list_splice(&bdi->wb.b_io, &dst->b_io);

		list_splice(&bdi->wb.b_more_io, &dst->b_more_io);

		spin_unlock(&inode_lock);

	}



	bdi_unregister(bdi);