perf diff: Use llabs() with 64-bit values

[sfrench/cifs-2.6.git] / fs / fs-writeback.c

diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 8461a63220398024c2aef5d4795d2f2aadd4ebfa..335607b8c5c001ca35847c5ec22409ab04d83b05 100644 (file)
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -576,10 +576,13 @@ void wbc_attach_and_unlock_inode(struct writeback_control *wbc,
        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.
+        * A dying wb indicates that either the blkcg associated with the
+        * memcg changed or the associated memcg is dying.  In the first
+        * case, a replacement wb should already be available and we should
+        * refresh the wb immediately.  In the second case, trying to
+        * refresh will keep failing.
         */
-       if (unlikely(wb_dying(wbc->wb)))
+       if (unlikely(wb_dying(wbc->wb) && !css_is_dying(wbc->wb->memcg_css)))
                inode_switch_wbs(inode, wbc->wb_id);
 }
 EXPORT_SYMBOL_GPL(wbc_attach_and_unlock_inode);