linux-kernel - Re: [PATCH v2 87/92] shmem: convert to ctime accessor functions

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20230706145623.jkgc7awfs4xhioqy@quack3>
Date:   Thu, 6 Jul 2023 16:56:23 +0200
From:   Jan Kara <jack@...e.cz>
To:     Jeff Layton <jlayton@...nel.org>
Cc:     Christian Brauner <brauner@...nel.org>,
        Hugh Dickins <hughd@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Al Viro <viro@...iv.linux.org.uk>, Jan Kara <jack@...e.cz>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCH v2 87/92] shmem: convert to ctime accessor functions

On Wed 05-07-23 15:01:52, Jeff Layton wrote:
> In later patches, we're going to change how the inode's ctime field is
> used. Switch to using accessor functions instead of raw accesses of
> inode->i_ctime.
> 
> Signed-off-by: Jeff Layton <jlayton@...nel.org>

Looks good. Feel free to add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> ---
>  mm/shmem.c | 22 ++++++++++++----------
>  1 file changed, 12 insertions(+), 10 deletions(-)
> 
> diff --git a/mm/shmem.c b/mm/shmem.c
> index 1693134959c5..51aaaf479437 100644
> --- a/mm/shmem.c
> +++ b/mm/shmem.c
> @@ -1064,7 +1064,7 @@ static void shmem_undo_range(struct inode *inode, loff_t lstart, loff_t lend,
>  void shmem_truncate_range(struct inode *inode, loff_t lstart, loff_t lend)
>  {
>  	shmem_undo_range(inode, lstart, lend, false);
> -	inode->i_ctime = inode->i_mtime = current_time(inode);
> +	inode->i_mtime = inode_set_ctime_current(inode);
>  	inode_inc_iversion(inode);
>  }
>  EXPORT_SYMBOL_GPL(shmem_truncate_range);
> @@ -1161,9 +1161,9 @@ static int shmem_setattr(struct mnt_idmap *idmap,
>  	if (attr->ia_valid & ATTR_MODE)
>  		error = posix_acl_chmod(idmap, dentry, inode->i_mode);
>  	if (!error && update_ctime) {
> -		inode->i_ctime = current_time(inode);
> +		inode_set_ctime_current(inode);
>  		if (update_mtime)
> -			inode->i_mtime = inode->i_ctime;
> +			inode->i_mtime = inode_get_ctime(inode);
>  		inode_inc_iversion(inode);
>  	}
>  	return error;
> @@ -2394,7 +2394,7 @@ static struct inode *shmem_get_inode(struct mnt_idmap *idmap, struct super_block
>  		inode->i_ino = ino;
>  		inode_init_owner(idmap, inode, dir, mode);
>  		inode->i_blocks = 0;
> -		inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
> +		inode->i_atime = inode->i_mtime = inode_set_ctime_current(inode);
>  		inode->i_generation = get_random_u32();
>  		info = SHMEM_I(inode);
>  		memset(info, 0, (char *)inode - (char *)info);
> @@ -3110,7 +3110,7 @@ shmem_mknod(struct mnt_idmap *idmap, struct inode *dir,
>  			goto out_iput;
>  
>  		dir->i_size += BOGO_DIRENT_SIZE;
> -		dir->i_ctime = dir->i_mtime = current_time(dir);
> +		dir->i_mtime = inode_set_ctime_current(dir);
>  		inode_inc_iversion(dir);
>  		d_instantiate(dentry, inode);
>  		dget(dentry); /* Extra count - pin the dentry in core */
> @@ -3193,7 +3193,8 @@ static int shmem_link(struct dentry *old_dentry, struct inode *dir, struct dentr
>  	}
>  
>  	dir->i_size += BOGO_DIRENT_SIZE;
> -	inode->i_ctime = dir->i_ctime = dir->i_mtime = current_time(inode);
> +	dir->i_mtime = inode_set_ctime_to_ts(dir,
> +					     inode_set_ctime_current(inode));
>  	inode_inc_iversion(dir);
>  	inc_nlink(inode);
>  	ihold(inode);	/* New dentry reference */
> @@ -3213,7 +3214,8 @@ static int shmem_unlink(struct inode *dir, struct dentry *dentry)
>  	simple_offset_remove(shmem_get_offset_ctx(dir), dentry);
>  
>  	dir->i_size -= BOGO_DIRENT_SIZE;
> -	inode->i_ctime = dir->i_ctime = dir->i_mtime = current_time(inode);
> +	dir->i_mtime = inode_set_ctime_to_ts(dir,
> +					     inode_set_ctime_current(inode));
>  	inode_inc_iversion(dir);
>  	drop_nlink(inode);
>  	dput(dentry);	/* Undo the count from "create" - this does all the work */
> @@ -3360,7 +3362,7 @@ static int shmem_symlink(struct mnt_idmap *idmap, struct inode *dir,
>  		folio_put(folio);
>  	}
>  	dir->i_size += BOGO_DIRENT_SIZE;
> -	dir->i_ctime = dir->i_mtime = current_time(dir);
> +	dir->i_mtime = inode_set_ctime_current(dir);
>  	inode_inc_iversion(dir);
>  	d_instantiate(dentry, inode);
>  	dget(dentry);
> @@ -3438,7 +3440,7 @@ static int shmem_fileattr_set(struct mnt_idmap *idmap,
>  		(fa->flags & SHMEM_FL_USER_MODIFIABLE);
>  
>  	shmem_set_inode_flags(inode, info->fsflags);
> -	inode->i_ctime = current_time(inode);
> +	inode_set_ctime_current(inode);
>  	inode_inc_iversion(inode);
>  	return 0;
>  }
> @@ -3508,7 +3510,7 @@ static int shmem_xattr_handler_set(const struct xattr_handler *handler,
>  	name = xattr_full_name(handler, name);
>  	err = simple_xattr_set(&info->xattrs, name, value, size, flags, NULL);
>  	if (!err) {
> -		inode->i_ctime = current_time(inode);
> +		inode_set_ctime_current(inode);
>  		inode_inc_iversion(inode);
>  	}
>  	return err;
> -- 
> 2.41.0
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR