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-rw-r--r--fs/fs-writeback.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 5eeb24a8082f..f60de54d2042 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -525,6 +525,13 @@ void wbc_attach_and_unlock_inode(struct writeback_control *wbc,
wb_get(wbc->wb);
spin_unlock(&inode->i_lock);
+
+ /*
+ * A dying wb indicates that the memcg-blkcg mapping has changed
+ * and a new wb is already serving the memcg. Switch immediately.
+ */
+ if (unlikely(wb_dying(wbc->wb)))
+ inode_switch_wbs(inode, wbc->wb_id);
}
/**