---

yaml
---
r: 200186
b: refs/heads/master
c: 070ecdc
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 99a4d54620264a614c89597bc5aaab22ec83f89c
+refs/heads/master: 070ecdca54dde9577d2697088e74e45568f48efb

trunk/fs/xfs/linux-2.6/xfs_aops.c

@@ -1332,6 +1332,21 @@ xfs_vm_writepage(
 
 	trace_xfs_writepage(inode, page, 0);
 
+	/*
+	 * Refuse to write the page out if we are called from reclaim context.
+	 *
+	 * This is primarily to avoid stack overflows when called from deep
+	 * used stacks in random callers for direct reclaim, but disabling
+	 * reclaim for kswap is a nice side-effect as kswapd causes rather
+	 * suboptimal I/O patters, too.
+	 *
+	 * This should really be done by the core VM, but until that happens
+	 * filesystems like XFS, btrfs and ext4 have to take care of this
+	 * by themselves.
+	 */
+	if (current->flags & PF_MEMALLOC)
+		goto out_fail;
+
 	/*
 	 * We need a transaction if:
 	 *  1. There are delalloc buffers on the page