Re: [PATCH 2/3] fs: move i_wb_list out from under inode_lock

[Christoph Hellwig <hch@infradead.org>]

> + * Write out an inode's dirty pages.  Called under inode_wb_list_lock.  Either
> + * the caller has ref on the inode (either via __iget or via syscall against an
> + * fd) or the inode has I_WILL_FREE set.

Just drop mentioning of how we got the reference ,it's rather pointless.

>  writeback_single_inode(struct inode *inode, struct writeback_control *wbc)
> @@ -354,7 +368,7 @@ writeback_single_inode(struct inode *inode, struct writeback_control *wbc)
>  	inode->i_state |= I_SYNC;
>  	inode->i_state &= ~I_DIRTY_PAGES;
>  	spin_unlock(&inode->i_lock);
> -	spin_unlock(&inode_lock);
> +	spin_unlock(&inode_wb_list_lock);

We don't actually need inode_wb_list_lock here.  But I guess we can
fix this later and be conservative for now.

> @@ -963,63 +976,62 @@ void __mark_inode_dirty(struct inode *inode, int flags)

I think the __mark_inode_dirty cleanup should be a separate patch,
it's rather confusing in the current form.

> +	if (was_dirty) {
> +out_unlock_inode:
>  		spin_unlock(&inode->i_lock);
> +		return;
> +	}

Please just move the label to the end of the function and add another
goto here.