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Subject[PATCH block/for-4.3] writeback: explain why @inode is allowed to be NULL for inode_congested()
Signed-off-by: Tejun Heo <tj@kernel.org>
Suggested-by: Jan Kara <jack@suse.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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