Message-ID: <20200306102158.0b88e0a0@canb.auug.org.au>
Date:   Fri, 6 Mar 2020 10:21:58 +1100
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     David Miller <davem@...emloft.net>,
        Networking <netdev@...r.kernel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        PowerPC <linuxppc-dev@...ts.ozlabs.org>
Cc:     Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Sourabh Jain <sourabhjain@...ux.ibm.com>,
        Christian Brauner <christian.brauner@...ntu.com>
Subject: linux-next: manual merge of the net-next tree with the powerpc tree

Hi all,

Today's linux-next merge of the net-next tree got a conflict in:

  fs/sysfs/group.c

between commit:

  9255782f7061 ("sysfs: Wrap __compat_only_sysfs_link_entry_to_kobj function to change the symlink name")

from the powerpc tree and commit:

  303a42769c4c ("sysfs: add sysfs_group{s}_change_owner()")

from the net-next 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.

-- 
Cheers,
Stephen Rothwell

diff --cc fs/sysfs/group.c
index 1e2a096057bc,5afe0e7ff7cd..000000000000
--- a/fs/sysfs/group.c
+++ b/fs/sysfs/group.c
@@@ -478,4 -457,118 +479,118 @@@ int compat_only_sysfs_link_entry_to_kob
  	kernfs_put(target);
  	return PTR_ERR_OR_ZERO(link);
  }
 -EXPORT_SYMBOL_GPL(__compat_only_sysfs_link_entry_to_kobj);
 +EXPORT_SYMBOL_GPL(compat_only_sysfs_link_entry_to_kobj);
+ 
+ static int sysfs_group_attrs_change_owner(struct kernfs_node *grp_kn,
+ 					  const struct attribute_group *grp,
+ 					  struct iattr *newattrs)
+ {
+ 	struct kernfs_node *kn;
+ 	int error;
+ 
+ 	if (grp->attrs) {
+ 		struct attribute *const *attr;
+ 
+ 		for (attr = grp->attrs; *attr; attr++) {
+ 			kn = kernfs_find_and_get(grp_kn, (*attr)->name);
+ 			if (!kn)
+ 				return -ENOENT;
+ 
+ 			error = kernfs_setattr(kn, newattrs);
+ 			kernfs_put(kn);
+ 			if (error)
+ 				return error;
+ 		}
+ 	}
+ 
+ 	if (grp->bin_attrs) {
+ 		struct bin_attribute *const *bin_attr;
+ 
+ 		for (bin_attr = grp->bin_attrs; *bin_attr; bin_attr++) {
+ 			kn = kernfs_find_and_get(grp_kn, (*bin_attr)->attr.name);
+ 			if (!kn)
+ 				return -ENOENT;
+ 
+ 			error = kernfs_setattr(kn, newattrs);
+ 			kernfs_put(kn);
+ 			if (error)
+ 				return error;
+ 		}
+ 	}
+ 
+ 	return 0;
+ }
+ 
+ /**
+  * sysfs_group_change_owner - change owner of an attribute group.
+  * @kobj:	The kobject containing the group.
+  * @grp:	The attribute group.
+  * @kuid:	new owner's kuid
+  * @kgid:	new owner's kgid
+  *
+  * Returns 0 on success or error code on failure.
+  */
+ int sysfs_group_change_owner(struct kobject *kobj,
+ 			     const struct attribute_group *grp, kuid_t kuid,
+ 			     kgid_t kgid)
+ {
+ 	struct kernfs_node *grp_kn;
+ 	int error;
+ 	struct iattr newattrs = {
+ 		.ia_valid = ATTR_UID | ATTR_GID,
+ 		.ia_uid = kuid,
+ 		.ia_gid = kgid,
+ 	};
+ 
+ 	if (!kobj->state_in_sysfs)
+ 		return -EINVAL;
+ 
+ 	if (grp->name) {
+ 		grp_kn = kernfs_find_and_get(kobj->sd, grp->name);
+ 	} else {
+ 		kernfs_get(kobj->sd);
+ 		grp_kn = kobj->sd;
+ 	}
+ 	if (!grp_kn)
+ 		return -ENOENT;
+ 
+ 	error = kernfs_setattr(grp_kn, &newattrs);
+ 	if (!error)
+ 		error = sysfs_group_attrs_change_owner(grp_kn, grp, &newattrs);
+ 
+ 	kernfs_put(grp_kn);
+ 
+ 	return error;
+ }
+ EXPORT_SYMBOL_GPL(sysfs_group_change_owner);
+ 
+ /**
+  * sysfs_groups_change_owner - change owner of a set of attribute groups.
+  * @kobj:	The kobject containing the groups.
+  * @groups:	The attribute groups.
+  * @kuid:	new owner's kuid
+  * @kgid:	new owner's kgid
+  *
+  * Returns 0 on success or error code on failure.
+  */
+ int sysfs_groups_change_owner(struct kobject *kobj,
+ 			      const struct attribute_group **groups,
+ 			      kuid_t kuid, kgid_t kgid)
+ {
+ 	int error = 0, i;
+ 
+ 	if (!kobj->state_in_sysfs)
+ 		return -EINVAL;
+ 
+ 	if (!groups)
+ 		return 0;
+ 
+ 	for (i = 0; groups[i]; i++) {
+ 		error = sysfs_group_change_owner(kobj, groups[i], kuid, kgid);
+ 		if (error)
+ 			break;
+ 	}
+ 
+ 	return error;
+ }
+ EXPORT_SYMBOL_GPL(sysfs_groups_change_owner);

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