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

From: Stephen Rothwell <[email-masked]>
Date: Mon, 22 Feb 2021 09:50:08 +1100

Hi all,

On Mon, 15 Feb 2021 08:01:44 +1100 Stephen Rothwell <[email-masked]> wrote:
>
> On Mon, 25 Jan 2021 16:48:06 +1100 Stephen Rothwell <[email-masked]> 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()")

This is now a conflict between the pidfd tree and Linus' tree.

-- 
Cheers,
Stephen Rothwell