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Subject: Re: [PATCH v2 2/5] ext4: cache NULL when both default_acl and acl are
 NULL
To:     tytso@mit.edu, adilger.kernel@dilger.ca
Cc:     jack@suse.com, jaegeuk@kernel.org, yuchao0@huawei.com,
        shaggy@kernel.org, hubcap@omnibond.com, martin@omnibond.com,
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        jfs-discussion@lists.sourceforge.net
References: <20180831143352.22970-1-cgxu519@gmx.com>
 <20180831143352.22970-2-cgxu519@gmx.com>
From:   cgxu519 <cgxu519@gmx.com>
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Date:   Wed, 12 Sep 2018 23:04:35 +0800
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On 08/31/2018 10:33 PM, Chengguang Xu wrote:
> default_acl and acl of newly created inode will be initiated
> as ACL_NOT_CACHED in vfs function inode_init_always() and later
> will be updated by calling xxx_init_acl() in specific filesystems.
> Howerver, when default_acl and acl are NULL then they keep the value
> of ACL_NOT_CACHED, this patch tries to cache NULL for acl/default_acl
> in this case.
>
> Signed-off-by: Chengguang Xu <cgxu519@gmx.com>
> ---
> v1->v2:
> - Coding style change.
>
>   fs/ext4/acl.c | 4 ++++
>   1 file changed, 4 insertions(+)
>
> diff --git a/fs/ext4/acl.c b/fs/ext4/acl.c
> index fb50f9aa6ead..c1d570ee1d9f 100644
> --- a/fs/ext4/acl.c
> +++ b/fs/ext4/acl.c
> @@ -284,12 +284,16 @@ ext4_init_acl(handle_t *handle, struct inode *inode, struct inode *dir)
>   		error = __ext4_set_acl(handle, inode, ACL_TYPE_DEFAULT,
>   				       default_acl, XATTR_CREATE);
>   		posix_acl_release(default_acl);
> +	} else {
> +		inode->i_default_acl = NULL;
>   	}
>   	if (acl) {
>   		if (!error)
>   			error = __ext4_set_acl(handle, inode, ACL_TYPE_ACCESS,
>   					       acl, XATTR_CREATE);
>   		posix_acl_release(acl);
> +	} else {
> +		inode->i_acl = NULL;
>   	}
>   	return error;
>   }

Hi Ted,  Andreas

Have you got chance to look at this patch?

Thanks,
Chengguang