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Subject: Re: [PATCH v7 14/16] f2fs: wire up new fscrypt ioctls
To:     Eric Biggers <ebiggers@kernel.org>, <linux-fscrypt@vger.kernel.org>
CC:     <linux-fsdevel@vger.kernel.org>, <linux-ext4@vger.kernel.org>,
        <linux-f2fs-devel@lists.sourceforge.net>,
        <linux-mtd@lists.infradead.org>, <linux-api@vger.kernel.org>,
        <linux-crypto@vger.kernel.org>, <keyrings@vger.kernel.org>,
        Paul Crowley <paulcrowley@google.com>,
        "Satya Tangirala" <satyat@google.com>
References: <20190726224141.14044-1-ebiggers@kernel.org>
 <20190726224141.14044-15-ebiggers@kernel.org>
From:   Chao Yu <yuchao0@huawei.com>
Message-ID: <e3cf53a7-faf2-0321-22de-07d2e2783752@huawei.com>
Date:   Fri, 2 Aug 2019 16:10:15 +0800
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Hi Eric,

On 2019/7/27 6:41, Eric Biggers wrote:
> From: Eric Biggers <ebiggers@google.com>
> 
> Wire up the new ioctls for adding and removing fscrypt keys to/from the
> filesystem, and the new ioctl for retrieving v2 encryption policies.
> 
> FS_IOC_REMOVE_ENCRYPTION_KEY also required making f2fs_drop_inode() call
> fscrypt_drop_inode().
> 
> For more details see Documentation/filesystems/fscrypt.rst and the
> fscrypt patches that added the implementation of these ioctls.
> 
> Signed-off-by: Eric Biggers <ebiggers@google.com>

Reviewed-by: Chao Yu <yuchao0@huawei.com>

BTW, do you think it needs to make xxfs_has_support_encrypt() function be a
common interface defined in struct fscrypt_operations, as I see all
fscrypt_ioctl_*() needs to check with it, tho such cleanup is minor...

Thanks,

> ---
>  fs/f2fs/file.c  | 46 ++++++++++++++++++++++++++++++++++++++++++++++
>  fs/f2fs/super.c |  2 ++
>  2 files changed, 48 insertions(+)
> 
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index f8d46df8fa9ee..d81dda290b829 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -2184,6 +2184,40 @@ static int f2fs_ioc_get_encryption_pwsalt(struct file *filp, unsigned long arg)
>  	return err;
>  }
>  
> +static int f2fs_ioc_get_encryption_policy_ex(struct file *filp,
> +					     unsigned long arg)
> +{
> +	if (!f2fs_sb_has_encrypt(F2FS_I_SB(file_inode(filp))))
> +		return -EOPNOTSUPP;
> +
> +	return fscrypt_ioctl_get_policy_ex(filp, (void __user *)arg);
> +}
> +
> +static int f2fs_ioc_add_encryption_key(struct file *filp, unsigned long arg)
> +{
> +	if (!f2fs_sb_has_encrypt(F2FS_I_SB(file_inode(filp))))
> +		return -EOPNOTSUPP;
> +
> +	return fscrypt_ioctl_add_key(filp, (void __user *)arg);
> +}
> +
> +static int f2fs_ioc_remove_encryption_key(struct file *filp, unsigned long arg)
> +{
> +	if (!f2fs_sb_has_encrypt(F2FS_I_SB(file_inode(filp))))
> +		return -EOPNOTSUPP;
> +
> +	return fscrypt_ioctl_remove_key(filp, (const void __user *)arg);
> +}
> +
> +static int f2fs_ioc_get_encryption_key_status(struct file *filp,
> +					      unsigned long arg)
> +{
> +	if (!f2fs_sb_has_encrypt(F2FS_I_SB(file_inode(filp))))
> +		return -EOPNOTSUPP;
> +
> +	return fscrypt_ioctl_get_key_status(filp, (void __user *)arg);
> +}
> +
>  static int f2fs_ioc_gc(struct file *filp, unsigned long arg)
>  {
>  	struct inode *inode = file_inode(filp);
> @@ -3109,6 +3143,14 @@ long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
>  		return f2fs_ioc_get_encryption_policy(filp, arg);
>  	case F2FS_IOC_GET_ENCRYPTION_PWSALT:
>  		return f2fs_ioc_get_encryption_pwsalt(filp, arg);
> +	case FS_IOC_GET_ENCRYPTION_POLICY_EX:
> +		return f2fs_ioc_get_encryption_policy_ex(filp, arg);
> +	case FS_IOC_ADD_ENCRYPTION_KEY:
> +		return f2fs_ioc_add_encryption_key(filp, arg);
> +	case FS_IOC_REMOVE_ENCRYPTION_KEY:
> +		return f2fs_ioc_remove_encryption_key(filp, arg);
> +	case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
> +		return f2fs_ioc_get_encryption_key_status(filp, arg);
>  	case F2FS_IOC_GARBAGE_COLLECT:
>  		return f2fs_ioc_gc(filp, arg);
>  	case F2FS_IOC_GARBAGE_COLLECT_RANGE:
> @@ -3236,6 +3278,10 @@ long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
>  	case F2FS_IOC_SET_ENCRYPTION_POLICY:
>  	case F2FS_IOC_GET_ENCRYPTION_PWSALT:
>  	case F2FS_IOC_GET_ENCRYPTION_POLICY:
> +	case FS_IOC_GET_ENCRYPTION_POLICY_EX:
> +	case FS_IOC_ADD_ENCRYPTION_KEY:
> +	case FS_IOC_REMOVE_ENCRYPTION_KEY:
> +	case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
>  	case F2FS_IOC_GARBAGE_COLLECT:
>  	case F2FS_IOC_GARBAGE_COLLECT_RANGE:
>  	case F2FS_IOC_WRITE_CHECKPOINT:
> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> index 6de6cda440315..f5fae8d511a20 100644
> --- a/fs/f2fs/super.c
> +++ b/fs/f2fs/super.c
> @@ -913,6 +913,8 @@ static int f2fs_drop_inode(struct inode *inode)
>  		return 0;
>  	}
>  	ret = generic_drop_inode(inode);
> +	if (!ret)
> +		ret = fscrypt_drop_inode(inode);
>  	trace_f2fs_drop_inode(inode, ret);
>  	return ret;
>  }
>