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Date:   Mon, 13 Apr 2020 08:41:42 -0700
From:   "Darrick J. Wong" <darrick.wong@oracle.com>
To:     ira.weiny@intel.com
Cc:     linux-kernel@vger.kernel.org, Dave Chinner <dchinner@redhat.com>,
        Dan Williams <dan.j.williams@intel.com>,
        Dave Chinner <david@fromorbit.com>,
        Christoph Hellwig <hch@lst.de>,
        "Theodore Y. Ts'o" <tytso@mit.edu>, Jan Kara <jack@suse.cz>,
        Jeff Moyer <jmoyer@redhat.com>, linux-ext4@vger.kernel.org,
        linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH V7 1/9] fs/xfs: Remove unnecessary initialization of
 i_rwsem
Message-ID: <20200413154142.GS6742@magnolia>
References: <20200413054046.1560106-1-ira.weiny@intel.com>
 <20200413054046.1560106-2-ira.weiny@intel.com>
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On Sun, Apr 12, 2020 at 10:40:38PM -0700, ira.weiny@intel.com wrote:
> From: Ira Weiny <ira.weiny@intel.com>
> 
> An earlier call of xfs_reinit_inode() from xfs_iget_cache_hit() already
> handles initialization of i_rwsem.
> 
> Doing so again is unneeded.
> 
> Reviewed-by: Dave Chinner <dchinner@redhat.com>
> Signed-off-by: Ira Weiny <ira.weiny@intel.com>

Seems reasonable to me,
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>

--D

> 
> ---
> Changes from V4:
> 	Update commit message to make it clear the xfs_iget_cache_hit()
> 	is actually doing the initialization via xfs_reinit_inode()
> 
> New for V4:
> 
> NOTE: This was found while ensuring the new i_aops_sem was properly
> handled.  It seems like this is a layering violation so I think it is
> worth cleaning up so as to not confuse others.
> ---
>  fs/xfs/xfs_icache.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/fs/xfs/xfs_icache.c b/fs/xfs/xfs_icache.c
> index 8dc2e5414276..836a1f09be03 100644
> --- a/fs/xfs/xfs_icache.c
> +++ b/fs/xfs/xfs_icache.c
> @@ -419,6 +419,7 @@ xfs_iget_cache_hit(
>  		spin_unlock(&ip->i_flags_lock);
>  		rcu_read_unlock();
>  
> +		ASSERT(!rwsem_is_locked(&inode->i_rwsem));
>  		error = xfs_reinit_inode(mp, inode);
>  		if (error) {
>  			bool wake;
> @@ -452,9 +453,6 @@ xfs_iget_cache_hit(
>  		ip->i_sick = 0;
>  		ip->i_checked = 0;
>  
> -		ASSERT(!rwsem_is_locked(&inode->i_rwsem));
> -		init_rwsem(&inode->i_rwsem);
> -
>  		spin_unlock(&ip->i_flags_lock);
>  		spin_unlock(&pag->pag_ici_lock);
>  	} else {
> -- 
> 2.25.1
>