linux-kernel - Re: [RFC][PATCH 07/10] orangefs: Use RCU for destroy

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Message-ID: <CAOg9mSQSRimt1tE=_OEy_VRNz9fCy9uMDcwHG28qf2ug5akWZA@mail.gmail.com>
Date:   Fri, 24 Feb 2017 18:00:31 -0500
From:   Mike Marshall <hubcap@...ibond.com>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Chris Mason <clm@...com>, LKML <linux-kernel@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        David Howells <dhowells@...hat.com>, elena.reshetova@...el.com,
        ishkamiel@...il.com, dwindsor@...il.com,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [RFC][PATCH 07/10] orangefs: Use RCU for destroy_inode

Thanks Al... I was going to try and evaluate that patch next
week, now all I have to do is test it <g> ...

-Mike

On Fri, Feb 24, 2017 at 3:52 PM, Al Viro <viro@...iv.linux.org.uk> wrote:
> That, AFAICS, fixes a real bug.  Applied, and it needs Cc:stable as well.
>
>
>> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
>> ---
>>  fs/orangefs/super.c |    9 ++++++++-
>>  1 file changed, 8 insertions(+), 1 deletion(-)
>>
>> --- a/fs/orangefs/super.c
>> +++ b/fs/orangefs/super.c
>> @@ -115,6 +115,13 @@ static struct inode *orangefs_alloc_inod
>>       return &orangefs_inode->vfs_inode;
>>  }
>>
>> +static void orangefs_i_callback(struct rcu_head *head)
>> +{
>> +     struct inode *inode = container_of(head, struct inode, i_rcu);
>> +     struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
>> +     kmem_cache_free(orangefs_inode_cache, orangefs_inode);
>> +}
>> +
>>  static void orangefs_destroy_inode(struct inode *inode)
>>  {
>>       struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
>> @@ -123,7 +130,7 @@ static void orangefs_destroy_inode(struc
>>                       "%s: deallocated %p destroying inode %pU\n",
>>                       __func__, orangefs_inode, get_khandle_from_ino(inode));
>>
>> -     kmem_cache_free(orangefs_inode_cache, orangefs_inode);
>> +     call_rcu(&inode->i_rcu, orangefs_i_callback);
>>  }
>>
>>  /*
>>
>>