sysfs: split out binary attribute handling from sysfs_add_file_mode_ns

Split adding binary attributes into a separate handler instead of
overloading sysfs_add_file_mode_ns.

Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20210913054121.616001-5-hch@lst.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 66 insertions, 54 deletions

diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index d019d6ac6ad0..f737bd61f71b 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -255,59 +255,73 @@ 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;
 	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;
-	} 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;
+
+	/* 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_empty;
+			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 = battr->size;
+#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,
+				  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)
@@ -315,7 +329,7 @@ int sysfs_add_file_mode_ns(struct kernfs_node *parent,
 #endif
 
 	kn = __kernfs_create_file(parent, attr->name, mode & 0777, uid, gid,
-				  size, ops, (void *)attr, ns, key);
+				  battr->size, ops, (void *)attr, ns, key);
 	if (IS_ERR(kn)) {
 		if (PTR_ERR(kn) == -EEXIST)
 			sysfs_warn_dup(parent, attr->name);
@@ -340,9 +354,7 @@ 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 +397,8 @@ 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 +567,8 @@ 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);