On Nov 24, 2020, at 5:23 PM, Eric Biggers <ebiggers@kernel.org> wrote:
> 
> From: Eric Biggers <ebiggers@google.com>
> 
> In preparation for reducing the visibility of fscrypt_require_key() by
> moving it to fscrypt_private.h, move the call to it from
> fscrypt_prepare_setattr() to an out-of-line function.
> 
> Signed-off-by: Eric Biggers <ebiggers@google.com>

Reviewed-by: Andreas Dilger <adilger@dilger.ca>

> ---
> fs/crypto/hooks.c       |  8 ++++++++
> include/linux/fscrypt.h | 11 +++++++++--
> 2 files changed, 17 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/crypto/hooks.c b/fs/crypto/hooks.c
> index 82f351d3113a..1c16dba222d9 100644
> --- a/fs/crypto/hooks.c
> +++ b/fs/crypto/hooks.c
> @@ -120,6 +120,14 @@ int __fscrypt_prepare_readdir(struct inode *dir)
> }
> EXPORT_SYMBOL_GPL(__fscrypt_prepare_readdir);
> 
> +int __fscrypt_prepare_setattr(struct dentry *dentry, struct iattr *attr)
> +{
> +	if (attr->ia_valid & ATTR_SIZE)
> +		return fscrypt_require_key(d_inode(dentry));
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(__fscrypt_prepare_setattr);
> +
> /**
>  * fscrypt_prepare_setflags() - prepare to change flags with FS_IOC_SETFLAGS
>  * @inode: the inode on which flags are being changed
> diff --git a/include/linux/fscrypt.h b/include/linux/fscrypt.h
> index 8cbb26f55695..b20900bb829f 100644
> --- a/include/linux/fscrypt.h
> +++ b/include/linux/fscrypt.h
> @@ -243,6 +243,7 @@ int __fscrypt_prepare_rename(struct inode *old_dir, struct dentry *old_dentry,
> int __fscrypt_prepare_lookup(struct inode *dir, struct dentry *dentry,
> 			     struct fscrypt_name *fname);
> int __fscrypt_prepare_readdir(struct inode *dir);
> +int __fscrypt_prepare_setattr(struct dentry *dentry, struct iattr *attr);
> int fscrypt_prepare_setflags(struct inode *inode,
> 			     unsigned int oldflags, unsigned int flags);
> int fscrypt_prepare_symlink(struct inode *dir, const char *target,
> @@ -543,6 +544,12 @@ static inline int __fscrypt_prepare_readdir(struct inode *dir)
> 	return -EOPNOTSUPP;
> }
> 
> +static inline int __fscrypt_prepare_setattr(struct dentry *dentry,
> +					    struct iattr *attr)
> +{
> +	return -EOPNOTSUPP;
> +}
> +
> static inline int fscrypt_prepare_setflags(struct inode *inode,
> 					   unsigned int oldflags,
> 					   unsigned int flags)
> @@ -840,8 +847,8 @@ static inline int fscrypt_prepare_readdir(struct inode *dir)
> static inline int fscrypt_prepare_setattr(struct dentry *dentry,
> 					  struct iattr *attr)
> {
> -	if (attr->ia_valid & ATTR_SIZE)
> -		return fscrypt_require_key(d_inode(dentry));
> +	if (IS_ENCRYPTED(d_inode(dentry)))
> +		return __fscrypt_prepare_setattr(dentry, attr);
> 	return 0;
> }
> 
> --
> 2.29.2
> 


Cheers, Andreas