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| author | Tejun Heo <tj@kernel.org> | 2015-08-18 14:54:54 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2015-08-18 15:49:15 -0700 |
| commit | 60292bcc1b240a6708aa531c8ece1da2a78d560a (patch) | |
| tree | 157569f5e11606542823dae9480e0a915e9a4e2d /fs/fs-writeback.c | |
| parent | 8a1270cda7b473c8ea71a7a44613465fe0708488 (diff) | |
| download | lwn-60292bcc1b240a6708aa531c8ece1da2a78d560a.tar.gz lwn-60292bcc1b240a6708aa531c8ece1da2a78d560a.zip | |
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>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'fs/fs-writeback.c')
| -rw-r--r-- | fs/fs-writeback.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c index 38e103506484..128404310fc0 100644 --- a/fs/fs-writeback.c +++ b/fs/fs-writeback.c @@ -701,7 +701,7 @@ EXPORT_SYMBOL_GPL(wbc_account_io); /** * 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 @@ -711,6 +711,9 @@ EXPORT_SYMBOL_GPL(wbc_account_io); * 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) { |