Merge tag 'v5.18'

Linux 5.18

5 files changed, 89 insertions, 92 deletions

diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index 59dffd5ca517..b6b6796e1616 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -56,8 +56,7 @@ int sysfs_create_dir_ns(struct kobject *kobj, const void *ns)
 
 	kobject_get_ownership(kobj, &uid, &gid);
 
-	kn = kernfs_create_dir_ns(parent, kobject_name(kobj),
-				  S_IRWXU | S_IRUGO | S_IXUGO, uid, gid,
+	kn = kernfs_create_dir_ns(parent, kobject_name(kobj), 0755, uid, gid,
 				  kobj, ns);
 	if (IS_ERR(kn)) {
 		if (PTR_ERR(kn) == -EEXIST)
diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index d019d6ac6ad0..a12ac0356c69 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -45,6 +45,9 @@ static int sysfs_kf_seq_show(struct seq_file *sf, void *v)
 	ssize_t count;
 	char *buf;
 
+	if (WARN_ON_ONCE(!ops->show))
+		return -EINVAL;
+
 	/* acquire buffer and ensure that it's >= PAGE_SIZE and clear */
 	count = seq_get_buf(sf, &buf);
 	if (count < PAGE_SIZE) {
@@ -53,15 +56,9 @@ static int sysfs_kf_seq_show(struct seq_file *sf, void *v)
 	}
 	memset(buf, 0, PAGE_SIZE);
 
-	/*
-	 * Invoke show().  Control may reach here via seq file lseek even
-	 * if @ops->show() isn't implemented.
-	 */
-	if (ops->show) {
-		count = ops->show(kobj, of->kn->priv, buf);
-		if (count < 0)
-			return count;
-	}
+	count = ops->show(kobj, of->kn->priv, buf);
+	if (count < 0)
+		return count;
 
 	/*
 	 * The code works fine with PAGE_SIZE return but it's likely to
@@ -255,67 +252,82 @@ static const struct kernfs_ops sysfs_bin_kfops_mmap = {
 };
 
 int sysfs_add_file_mode_ns(struct kernfs_node *parent,
-			   const struct attribute *attr, bool is_bin,
-			   umode_t mode, kuid_t uid, kgid_t gid, const void *ns)
+		const struct attribute *attr, umode_t mode, kuid_t uid,
+		kgid_t gid, const void *ns)
 {
+	struct kobject *kobj = parent->priv;
+	const struct sysfs_ops *sysfs_ops = kobj->ktype->sysfs_ops;
 	struct lock_class_key *key = NULL;
-	const struct kernfs_ops *ops;
+	const struct kernfs_ops *ops = NULL;
 	struct kernfs_node *kn;
-	loff_t size;
-
-	if (!is_bin) {
-		struct kobject *kobj = parent->priv;
-		const struct sysfs_ops *sysfs_ops = kobj->ktype->sysfs_ops;
-
-		/* every kobject with an attribute needs a ktype assigned */
-		if (WARN(!sysfs_ops, KERN_ERR
-			 "missing sysfs attribute operations for kobject: %s\n",
-			 kobject_name(kobj)))
-			return -EINVAL;
-
-		if (sysfs_ops->show && sysfs_ops->store) {
-			if (mode & SYSFS_PREALLOC)
-				ops = &sysfs_prealloc_kfops_rw;
-			else
-				ops = &sysfs_file_kfops_rw;
-		} else if (sysfs_ops->show) {
-			if (mode & SYSFS_PREALLOC)
-				ops = &sysfs_prealloc_kfops_ro;
-			else
-				ops = &sysfs_file_kfops_ro;
-		} else if (sysfs_ops->store) {
-			if (mode & SYSFS_PREALLOC)
-				ops = &sysfs_prealloc_kfops_wo;
-			else
-				ops = &sysfs_file_kfops_wo;
-		} else
-			ops = &sysfs_file_kfops_empty;
-
-		size = PAGE_SIZE;
+
+	/* every kobject with an attribute needs a ktype assigned */
+	if (WARN(!sysfs_ops, KERN_ERR
+			"missing sysfs attribute operations for kobject: %s\n",
+			kobject_name(kobj)))
+		return -EINVAL;
+
+	if (mode & SYSFS_PREALLOC) {
+		if (sysfs_ops->show && sysfs_ops->store)
+			ops = &sysfs_prealloc_kfops_rw;
+		else if (sysfs_ops->show)
+			ops = &sysfs_prealloc_kfops_ro;
+		else if (sysfs_ops->store)
+			ops = &sysfs_prealloc_kfops_wo;
 	} else {
-		struct bin_attribute *battr = (void *)attr;
-
-		if (battr->mmap)
-			ops = &sysfs_bin_kfops_mmap;
-		else if (battr->read && battr->write)
-			ops = &sysfs_bin_kfops_rw;
-		else if (battr->read)
-			ops = &sysfs_bin_kfops_ro;
-		else if (battr->write)
-			ops = &sysfs_bin_kfops_wo;
-		else
-			ops = &sysfs_file_kfops_empty;
-
-		size = battr->size;
+		if (sysfs_ops->show && sysfs_ops->store)
+			ops = &sysfs_file_kfops_rw;
+		else if (sysfs_ops->show)
+			ops = &sysfs_file_kfops_ro;
+		else if (sysfs_ops->store)
+			ops = &sysfs_file_kfops_wo;
 	}
 
+	if (!ops)
+		ops = &sysfs_file_kfops_empty;
+
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 	if (!attr->ignore_lockdep)
 		key = attr->key ?: (struct lock_class_key *)&attr->skey;
 #endif
 
 	kn = __kernfs_create_file(parent, attr->name, mode & 0777, uid, gid,
-				  size, ops, (void *)attr, ns, key);
+				  PAGE_SIZE, ops, (void *)attr, ns, key);
+	if (IS_ERR(kn)) {
+		if (PTR_ERR(kn) == -EEXIST)
+			sysfs_warn_dup(parent, attr->name);
+		return PTR_ERR(kn);
+	}
+	return 0;
+}
+
+int sysfs_add_bin_file_mode_ns(struct kernfs_node *parent,
+		const struct bin_attribute *battr, umode_t mode,
+		kuid_t uid, kgid_t gid, const void *ns)
+{
+	const struct attribute *attr = &battr->attr;
+	struct lock_class_key *key = NULL;
+	const struct kernfs_ops *ops;
+	struct kernfs_node *kn;
+
+	if (battr->mmap)
+		ops = &sysfs_bin_kfops_mmap;
+	else if (battr->read && battr->write)
+		ops = &sysfs_bin_kfops_rw;
+	else if (battr->read)
+		ops = &sysfs_bin_kfops_ro;
+	else if (battr->write)
+		ops = &sysfs_bin_kfops_wo;
+	else
+		ops = &sysfs_file_kfops_empty;
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+	if (!attr->ignore_lockdep)
+		key = attr->key ?: (struct lock_class_key *)&attr->skey;
+#endif
+
+	kn = __kernfs_create_file(parent, attr->name, mode & 0777, uid, gid,
+				  battr->size, ops, (void *)attr, ns, key);
 	if (IS_ERR(kn)) {
 		if (PTR_ERR(kn) == -EEXIST)
 			sysfs_warn_dup(parent, attr->name);
@@ -340,9 +352,7 @@ int sysfs_create_file_ns(struct kobject *kobj, const struct attribute *attr,
 		return -EINVAL;
 
 	kobject_get_ownership(kobj, &uid, &gid);
-	return sysfs_add_file_mode_ns(kobj->sd, attr, false, attr->mode,
-				      uid, gid, ns);
-
+	return sysfs_add_file_mode_ns(kobj->sd, attr, attr->mode, uid, gid, ns);
 }
 EXPORT_SYMBOL_GPL(sysfs_create_file_ns);
 
@@ -385,8 +395,8 @@ int sysfs_add_file_to_group(struct kobject *kobj,
 		return -ENOENT;
 
 	kobject_get_ownership(kobj, &uid, &gid);
-	error = sysfs_add_file_mode_ns(parent, attr, false,
-				       attr->mode, uid, gid, NULL);
+	error = sysfs_add_file_mode_ns(parent, attr, attr->mode, uid, gid,
+				       NULL);
 	kernfs_put(parent);
 
 	return error;
@@ -555,8 +565,8 @@ int sysfs_create_bin_file(struct kobject *kobj,
 		return -EINVAL;
 
 	kobject_get_ownership(kobj, &uid, &gid);
-	return sysfs_add_file_mode_ns(kobj->sd, &attr->attr, true,
-				      attr->attr.mode, uid, gid, NULL);
+	return sysfs_add_bin_file_mode_ns(kobj->sd, attr, attr->attr.mode, uid,
+					   gid, NULL);
 }
 EXPORT_SYMBOL_GPL(sysfs_create_bin_file);
 
@@ -693,19 +703,6 @@ int sysfs_change_owner(struct kobject *kobj, kuid_t kuid, kgid_t kgid)
 
 	ktype = get_ktype(kobj);
 	if (ktype) {
-		struct attribute **kattr;
-
-		/*
-		 * Change owner of the default attributes associated with the
-		 * ktype of @kobj.
-		 */
-		for (kattr = ktype->default_attrs; kattr && *kattr; kattr++) {
-			error = sysfs_file_change_owner(kobj, (*kattr)->name,
-							kuid, kgid);
-			if (error)
-				return error;
-		}
-
 		/*
 		 * Change owner of the default groups associated with the
 		 * ktype of @kobj.
diff --git a/fs/sysfs/group.c b/fs/sysfs/group.c
index f29d62004527..eeb0e3099421 100644
--- a/fs/sysfs/group.c
+++ b/fs/sysfs/group.c
@@ -61,8 +61,8 @@ static int create_files(struct kernfs_node *parent, struct kobject *kobj,
 			     (*attr)->name, mode);
 
 			mode &= SYSFS_PREALLOC | 0664;
-			error = sysfs_add_file_mode_ns(parent, *attr, false,
-						       mode, uid, gid, NULL);
+			error = sysfs_add_file_mode_ns(parent, *attr, mode, uid,
+						       gid, NULL);
 			if (unlikely(error))
 				break;
 		}
@@ -90,10 +90,9 @@ static int create_files(struct kernfs_node *parent, struct kobject *kobj,
 			     (*bin_attr)->attr.name, mode);
 
 			mode &= SYSFS_PREALLOC | 0664;
-			error = sysfs_add_file_mode_ns(parent,
-					&(*bin_attr)->attr, true,
-					mode,
-					uid, gid, NULL);
+			error = sysfs_add_bin_file_mode_ns(parent, *bin_attr,
+							   mode, uid, gid,
+							   NULL);
 			if (error)
 				break;
 		}
@@ -340,8 +339,8 @@ int sysfs_merge_group(struct kobject *kobj,
 	kobject_get_ownership(kobj, &uid, &gid);
 
 	for ((i = 0, attr = grp->attrs); *attr && !error; (++i, ++attr))
-		error = sysfs_add_file_mode_ns(parent, *attr, false,
-					       (*attr)->mode, uid, gid, NULL);
+		error = sysfs_add_file_mode_ns(parent, *attr, (*attr)->mode,
+					       uid, gid, NULL);
 	if (error) {
 		while (--i >= 0)
 			kernfs_remove_by_name(parent, (*--attr)->name);
diff --git a/fs/sysfs/mount.c b/fs/sysfs/mount.c
index e747c135c1d1..98467bb76737 100644
--- a/fs/sysfs/mount.c
+++ b/fs/sysfs/mount.c
@@ -103,7 +103,7 @@ int __init sysfs_init(void)
 	if (IS_ERR(sysfs_root))
 		return PTR_ERR(sysfs_root);
 
-	sysfs_root_kn = sysfs_root->kn;
+	sysfs_root_kn = kernfs_root_to_node(sysfs_root);
 
 	err = register_filesystem(&sysfs_fs_type);
 	if (err) {
diff --git a/fs/sysfs/sysfs.h b/fs/sysfs/sysfs.h
index 0050cc0c0236..3f28c9af5756 100644
--- a/fs/sysfs/sysfs.h
+++ b/fs/sysfs/sysfs.h
@@ -28,9 +28,11 @@ void sysfs_warn_dup(struct kernfs_node *parent, const char *name);
  * file.c
  */
 int sysfs_add_file_mode_ns(struct kernfs_node *parent,
-			   const struct attribute *attr, bool is_bin,
-			   umode_t amode, kuid_t uid, kgid_t gid,
-			   const void *ns);
+		const struct attribute *attr, umode_t amode, kuid_t uid,
+		kgid_t gid, const void *ns);
+int sysfs_add_bin_file_mode_ns(struct kernfs_node *parent,
+		const struct bin_attribute *battr, umode_t mode,
+		kuid_t uid, kgid_t gid, const void *ns);
 
 /*
  * symlink.c