Re: [PATCH v2] fs/dcache.c: avoid soft-lockup in dput()
From: Al Viro <viro@ZenIV.linux.org.uk>
Date: 2016-09-16 12:10:23
Also in:
linux-fsdevel, lkml
On Fri, Sep 16, 2016 at 01:19:19PM +0530, Vaishali Thakkar wrote:
Hi, Just a question regarding this change. As after this change dput() is sleepable, is it still safe to use if under the spinlock in the function d_prune_aliases?
It has always been sleepable and it wouldn't have been safe to use under spinlocks. Which d_prune_aliases() does not do - __dentry_kill() is called with dentry, its parent and its inode (if present) all locked and it drops all those locks before returning.