Re: [PATCH v11 1/5] fs: add iput_if_not_last() helper

[Christian Brauner]

> Add a helper that drops an inode reference only if the caller does not
> hold the last one.  Returns true if the reference was dropped, false
> otherwise.
> 
> This is useful for filesystems that need to release inode references
> in contexts where triggering final iput (and thus eviction) would be
> unsafe due to lock ordering constraints.  The caller can check the
> return value and defer the final iput to a safe context.
> 
> Unlike iput_not_last() which BUG_ON's if called with the last ref,
> this variant is designed to be called speculatively.
> 
> Signed-off-by: Yun Zhou <yun.zhou@xxxxxxxxxxxxx>
> Suggested-by: Jan Kara <jack@xxxxxxx>
> Reviewed-by: Jan Kara <jack@xxxxxxx>

Reviewed-by: Christian Brauner (Amutable) <brauner@xxxxxxxxxx>

-- 
Christian Brauner <brauner@xxxxxxxxxx>