linux-kernel - Re: [PATCH v14 04/22] vfs: Make the inode passed to inode_change

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Date:	Fri, 6 Nov 2015 14:04:07 -0700
From:	Andreas Dilger <adilger@...ger.ca>
To:	Andreas Gruenbacher <agruenba@...hat.com>
Cc:	Alexander Viro <viro@...iv.linux.org.uk>,
	Theodore Ts'o <tytso@....edu>,
	Andreas Dilger <adilger.kernel@...ger.ca>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Jeff Layton <jlayton@...chiereds.net>,
	Trond Myklebust <trond.myklebust@...marydata.com>,
	Anna Schumaker <anna.schumaker@...app.com>,
	Dave Chinner <david@...morbit.com>, linux-ext4@...r.kernel.org,
	xfs@....sgi.com, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-nfs@...r.kernel.org,
	linux-cifs@...r.kernel.org, linux-api@...r.kernel.org
Subject: Re: [PATCH v14 04/22] vfs: Make the inode passed to inode_change_ok non-const


> On Nov 5, 2015, at 4:39 AM, Andreas Gruenbacher <agruenba@...hat.com> wrote:
> 
> We will need to call iop->permission and iop->get_acl from
> inode_change_ok() for additional permission checks, and both take a
> non-const inode.

Seems unfortunate that those functions cannot themselves be changed to
take a const struct inode, but it doesn't look possible.

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

> Signed-off-by: Andreas Gruenbacher <agruenba@...hat.com>
> Reviewed-by: J. Bruce Fields <bfields@...hat.com>
> ---
> fs/attr.c          | 2 +-
> include/linux/fs.h | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/attr.c b/fs/attr.c
> index 6530ced..328be71 100644
> --- a/fs/attr.c
> +++ b/fs/attr.c
> @@ -28,7 +28,7 @@
>  * Should be called as the first thing in ->setattr implementations,
>  * possibly after taking additional locks.
>  */
> -int inode_change_ok(const struct inode *inode, struct iattr *attr)
> +int inode_change_ok(struct inode *inode, struct iattr *attr)
> {
> 	unsigned int ia_valid = attr->ia_valid;
> 
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index 402acd7..aab32c8 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -2871,7 +2871,7 @@ extern int buffer_migrate_page(struct address_space *,
> #define buffer_migrate_page NULL
> #endif
> 
> -extern int inode_change_ok(const struct inode *, struct iattr *);
> +extern int inode_change_ok(struct inode *, struct iattr *);
> extern int inode_newsize_ok(const struct inode *, loff_t offset);
> extern void setattr_copy(struct inode *inode, const struct iattr *attr);
> 
> --
> 2.5.0
> 


Cheers, Andreas






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