linux-kernel - [PATCH block/for-4.3] writeback: explain why @inode is allowed to be NULL for inode

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Date:	Sat, 4 Jul 2015 11:12:00 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Jan Kara <jack@...e.cz>
Cc:	axboe@...nel.dk, linux-kernel@...r.kernel.org, hch@...radead.org,
	hannes@...xchg.org, linux-fsdevel@...r.kernel.org,
	vgoyal@...hat.com, lizefan@...wei.com, cgroups@...r.kernel.org,
	linux-mm@...ck.org, mhocko@...e.cz, clm@...com,
	fengguang.wu@...el.com, david@...morbit.com, gthelen@...gle.com,
	khlebnikov@...dex-team.ru
Subject: [PATCH block/for-4.3] writeback: explain why @inode is allowed to be
 NULL for inode_congested()

Signed-off-by: Tejun Heo <tj@...nel.org>
Suggested-by: Jan Kara <jack@...e.cz>
---
Hello,

So, something like this.  I'll resend this patch as part of a patch
series once -rc1 drops.

Thanks.

 fs/fs-writeback.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -700,7 +700,7 @@ void wbc_account_io(struct writeback_con
 
 /**
  * inode_congested - test whether an inode is congested
- * @inode: inode to test for congestion
+ * @inode: inode to test for congestion (may be NULL)
  * @cong_bits: mask of WB_[a]sync_congested bits to test
  *
  * Tests whether @inode is congested.  @cong_bits is the mask of congestion
@@ -710,6 +710,9 @@ void wbc_account_io(struct writeback_con
  * determined by whether the cgwb (cgroup bdi_writeback) for the blkcg
  * associated with @inode is congested; otherwise, the root wb's congestion
  * state is used.
+ *
+ * @inode is allowed to be NULL as this function is often called on
+ * mapping->host which is NULL for the swapper space.
  */
 int inode_congested(struct inode *inode, int cong_bits)
 {
--
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