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authorJens Axboe <jens.axboe@oracle.com>2009-09-14 12:57:56 +0200
committerJens Axboe <jens.axboe@oracle.com>2009-09-16 15:18:52 +0200
commitce5f8e7795195edb6f84f74aa9d72e739df38486 (patch)
treef8d5a3a18d70b49b2c9bbe47f62c908e8eda9c64
parentb6e51316daede0633e9274e1e30391cfa4747877 (diff)
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: Jens Axboe <jens.axboe@oracle.com>
-rw-r--r--mm/backing-dev.c14
1 files changed, 13 insertions, 1 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index fd93566345b..3d3accb1f80 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -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);