Commit 4546d178 authored by Nikolay Borisov's avatar Nikolay Borisov Committed by David Sterba
Browse files

btrfs: Document logic regarding inode in async_cow_submit 



Add a comment explaining when ->inode could be NULL and why we always
perform the ->async_delalloc_pages modification.

Signed-off-by: default avatarNikolay Borisov <nborisov@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent a1d64ba6

fs/btrfs/inode.c

+6 −0
Original line number Diff line number Diff line
@@ -1165,6 +1165,12 @@ static noinline void async_cow_submit(struct btrfs_work *work) 
	    5 * SZ_1M)

		cond_wake_up_nomb(&fs_info->async_submit_wait);



	/*

	 * ->inode could be NULL if async_cow_start has failed to compress,

	 * in which case we don't have anything to submit, yet we need to

	 * always adjust ->async_delalloc_pages as its paired with the init

	 * happening in cow_file_range_async

	 */

	if (async_cow->inode)

		submit_compressed_extents(async_cow);

}