linux-kernel - Re: linux-next: manual merge of the pidfd tree with the f2fs tree

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Date:   Mon, 15 Feb 2021 08:01:44 +1100
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Christian Brauner <christian@...uner.io>,
        Jaegeuk Kim <jaegeuk@...nel.org>
Cc:     Chao Yu <chao@...nel.org>, Chao Yu <yuchao0@...wei.com>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: manual merge of the pidfd tree with the f2fs tree

Hi all,

On Mon, 25 Jan 2021 16:48:06 +1100 Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> 
> Today's linux-next merge of the pidfd tree got a conflict in:
> 
>   fs/f2fs/file.c
> 
> between commits:
> 
>   19bb7075d1a9 ("f2fs: fix out-of-repair __setattr_copy()")
>   7cf2e6173b2d ("f2fs: enhance to update i_mode and acl atomically in f2fs_setattr()")
> 
> from the f2fs tree and commit:
> 
>   2f221d6f7b88 ("attr: handle idmapped mounts")
>   e65ce2a50cf6 ("acl: handle idmapped mounts")
> 
> from the pidfd tree.
> 
> I fixed it up (see below) and can carry the fix as necessary. This
> is now fixed as far as linux-next is concerned, but any non trivial
> conflicts should be mentioned to your upstream maintainer when your tree
> is submitted for merging.  You may also want to consider cooperating
> with the maintainer of the conflicting tree to minimise any particularly
> complex conflicts.
> 
> diff --cc fs/f2fs/file.c
> index 7db27c81d034,8f1e97e7d242..000000000000
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@@ -851,9 -848,9 +852,10 @@@ static void __setattr_copy(struct user_
>   		inode->i_ctime = attr->ia_ctime;
>   	if (ia_valid & ATTR_MODE) {
>   		umode_t mode = attr->ia_mode;
> + 		kgid_t kgid = i_gid_into_mnt(mnt_userns, inode);
>   
> - 		if (!in_group_p(inode->i_gid) &&
> - 			!capable_wrt_inode_uidgid(inode, CAP_FSETID))
>  -		if (!in_group_p(kgid) && !capable(CAP_FSETID))
> ++		if (!in_group_p(kgid) &&
> ++			!capable_wrt_inode_uidgid(mnt_userns, inode, CAP_FSETID))
>   			mode &= ~S_ISGID;
>   		set_acl_inode(inode, mode);
>   	}
> @@@ -958,14 -948,13 +961,14 @@@ int f2fs_setattr(struct user_namespace 
>   		spin_unlock(&F2FS_I(inode)->i_size_lock);
>   	}
>   
> - 	__setattr_copy(inode, attr);
> + 	__setattr_copy(&init_user_ns, inode, attr);
>   
>   	if (attr->ia_valid & ATTR_MODE) {
> - 		err = posix_acl_chmod(inode, f2fs_get_inode_mode(inode));
> - 
> + 		err = posix_acl_chmod(&init_user_ns, inode,
> + 				      f2fs_get_inode_mode(inode));
>  -		if (err || is_inode_flag_set(inode, FI_ACL_MODE)) {
>  -			inode->i_mode = F2FS_I(inode)->i_acl_mode;
>  +		if (is_inode_flag_set(inode, FI_ACL_MODE)) {
>  +			if (!err)
>  +				inode->i_mode = F2FS_I(inode)->i_acl_mode;
>   			clear_inode_flag(inode, FI_ACL_MODE);
>   		}
>   	}

With the merge window about to open, this is a reminder that this
conflict still exists.

The fsf2 tree commits are now

  17232e830afb ("f2fs: enhance to update i_mode and acl atomically in f2fs_setattr()")
  2562515f0ad7 ("f2fs: fix out-of-repair __setattr_copy()")

-- 
Cheers,
Stephen Rothwell

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