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Commit 60292bcc authored by Tejun Heo's avatar Tejun Heo Committed by Jens Axboe
Browse files

writeback: explain why @inode is allowed to be NULL for inode_congested() 



Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Suggested-by: default avatarJan Kara <jack@suse.cz>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent 8a1270cd

fs/fs-writeback.c

+4 −1
Original line number Original line Diff line number Diff line
@@ -701,7 +701,7 @@ EXPORT_SYMBOL_GPL(wbc_account_io); 




/**

/**

 * inode_congested - test whether an inode is congested

 * 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

 * @cong_bits: mask of WB_[a]sync_congested bits to test

 *

 *

 * Tests whether @inode is congested.  @cong_bits is the mask of congestion

 * 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

 * determined by whether the cgwb (cgroup bdi_writeback) for the blkcg

 * associated with @inode is congested; otherwise, the root wb's congestion

 * associated with @inode is congested; otherwise, the root wb's congestion

 * state is used.

 * 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)

int inode_congested(struct inode *inode, int cong_bits)

{

{