Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/fs/sysfs/Kconfig b/fs/sysfs/Kconfig
index b275601..b0fe1cc 100644
--- a/fs/sysfs/Kconfig
+++ b/fs/sysfs/Kconfig
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
config SYSFS
bool "sysfs file system support" if EXPERT
default y
diff --git a/fs/sysfs/Makefile b/fs/sysfs/Makefile
index 6eff6e1..0906b9e 100644
--- a/fs/sysfs/Makefile
+++ b/fs/sysfs/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
#
# Makefile for the sysfs virtual filesystem
#
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index feeae80..aa85f28 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -43,7 +43,8 @@
kuid_t uid;
kgid_t gid;
- BUG_ON(!kobj);
+ if (WARN_ON(!kobj))
+ return -EINVAL;
if (kobj->parent)
parent = kobj->parent->sd;
diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index 0a7252a..130fc6f 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -17,7 +17,6 @@
#include <linux/seq_file.h>
#include "sysfs.h"
-#include "../kernfs/kernfs-internal.h"
/*
* Determine ktype->sysfs_ops for the given kernfs_node. This function
@@ -325,7 +324,8 @@
kuid_t uid;
kgid_t gid;
- BUG_ON(!kobj || !kobj->sd || !attr);
+ if (WARN_ON(!kobj || !kobj->sd || !attr))
+ return -EINVAL;
kobject_get_ownership(kobj, &uid, &gid);
return sysfs_add_file_mode_ns(kobj->sd, attr, false, attr->mode,
@@ -334,7 +334,7 @@
}
EXPORT_SYMBOL_GPL(sysfs_create_file_ns);
-int sysfs_create_files(struct kobject *kobj, const struct attribute **ptr)
+int sysfs_create_files(struct kobject *kobj, const struct attribute * const *ptr)
{
int err = 0;
int i;
@@ -493,9 +493,10 @@
return ret;
}
-void sysfs_remove_files(struct kobject *kobj, const struct attribute **ptr)
+void sysfs_remove_files(struct kobject *kobj, const struct attribute * const *ptr)
{
int i;
+
for (i = 0; ptr[i]; i++)
sysfs_remove_file(kobj, ptr[i]);
}
@@ -537,7 +538,8 @@
kuid_t uid;
kgid_t gid;
- BUG_ON(!kobj || !kobj->sd || !attr);
+ if (WARN_ON(!kobj || !kobj->sd || !attr))
+ return -EINVAL;
kobject_get_ownership(kobj, &uid, &gid);
return sysfs_add_file_mode_ns(kobj->sd, &attr->attr, true,
diff --git a/fs/sysfs/group.c b/fs/sysfs/group.c
index 1eb2d63..d41c21f 100644
--- a/fs/sysfs/group.c
+++ b/fs/sysfs/group.c
@@ -112,7 +112,8 @@
kgid_t gid;
int error;
- BUG_ON(!kobj || (!update && !kobj->sd));
+ if (WARN_ON(!kobj || (!update && !kobj->sd)))
+ return -EINVAL;
/* Updates may happen before the object has been instantiated */
if (unlikely(update && !kobj->sd))
@@ -174,6 +175,26 @@
}
EXPORT_SYMBOL_GPL(sysfs_create_group);
+static int internal_create_groups(struct kobject *kobj, int update,
+ const struct attribute_group **groups)
+{
+ int error = 0;
+ int i;
+
+ if (!groups)
+ return 0;
+
+ for (i = 0; groups[i]; i++) {
+ error = internal_create_group(kobj, update, groups[i]);
+ if (error) {
+ while (--i >= 0)
+ sysfs_remove_group(kobj, groups[i]);
+ break;
+ }
+ }
+ return error;
+}
+
/**
* sysfs_create_groups - given a directory kobject, create a bunch of attribute groups
* @kobj: The kobject to create the group on
@@ -190,25 +211,29 @@
int sysfs_create_groups(struct kobject *kobj,
const struct attribute_group **groups)
{
- int error = 0;
- int i;
-
- if (!groups)
- return 0;
-
- for (i = 0; groups[i]; i++) {
- error = sysfs_create_group(kobj, groups[i]);
- if (error) {
- while (--i >= 0)
- sysfs_remove_group(kobj, groups[i]);
- break;
- }
- }
- return error;
+ return internal_create_groups(kobj, 0, groups);
}
EXPORT_SYMBOL_GPL(sysfs_create_groups);
/**
+ * sysfs_update_groups - given a directory kobject, create a bunch of attribute groups
+ * @kobj: The kobject to update the group on
+ * @groups: The attribute groups to update, NULL terminated
+ *
+ * This function update a bunch of attribute groups. If an error occurs when
+ * updating a group, all previously updated groups will be removed together
+ * with already existing (not updated) attributes.
+ *
+ * Returns 0 on success or error code from sysfs_update_group on failure.
+ */
+int sysfs_update_groups(struct kobject *kobj,
+ const struct attribute_group **groups)
+{
+ return internal_create_groups(kobj, 1, groups);
+}
+EXPORT_SYMBOL_GPL(sysfs_update_groups);
+
+/**
* sysfs_update_group - given a directory kobject, update an attribute group
* @kobj: The kobject to update the group on
* @grp: The attribute group to update
diff --git a/fs/sysfs/mount.c b/fs/sysfs/mount.c
index 92682fc..db81cfb 100644
--- a/fs/sysfs/mount.c
+++ b/fs/sysfs/mount.c
@@ -13,34 +13,70 @@
#include <linux/magic.h>
#include <linux/mount.h>
#include <linux/init.h>
+#include <linux/slab.h>
#include <linux/user_namespace.h>
+#include <linux/fs_context.h>
+#include <net/net_namespace.h>
#include "sysfs.h"
static struct kernfs_root *sysfs_root;
struct kernfs_node *sysfs_root_kn;
-static struct dentry *sysfs_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *data)
+static int sysfs_get_tree(struct fs_context *fc)
{
- struct dentry *root;
- void *ns;
- bool new_sb = false;
+ struct kernfs_fs_context *kfc = fc->fs_private;
+ int ret;
- if (!(flags & SB_KERNMOUNT)) {
+ ret = kernfs_get_tree(fc);
+ if (ret)
+ return ret;
+
+ if (kfc->new_sb_created)
+ fc->root->d_sb->s_iflags |= SB_I_USERNS_VISIBLE;
+ return 0;
+}
+
+static void sysfs_fs_context_free(struct fs_context *fc)
+{
+ struct kernfs_fs_context *kfc = fc->fs_private;
+
+ if (kfc->ns_tag)
+ kobj_ns_drop(KOBJ_NS_TYPE_NET, kfc->ns_tag);
+ kernfs_free_fs_context(fc);
+ kfree(kfc);
+}
+
+static const struct fs_context_operations sysfs_fs_context_ops = {
+ .free = sysfs_fs_context_free,
+ .get_tree = sysfs_get_tree,
+};
+
+static int sysfs_init_fs_context(struct fs_context *fc)
+{
+ struct kernfs_fs_context *kfc;
+ struct net *netns;
+
+ if (!(fc->sb_flags & SB_KERNMOUNT)) {
if (!kobj_ns_current_may_mount(KOBJ_NS_TYPE_NET))
- return ERR_PTR(-EPERM);
+ return -EPERM;
}
- ns = kobj_ns_grab_current(KOBJ_NS_TYPE_NET);
- root = kernfs_mount_ns(fs_type, flags, sysfs_root,
- SYSFS_MAGIC, &new_sb, ns);
- if (!new_sb)
- kobj_ns_drop(KOBJ_NS_TYPE_NET, ns);
- else if (!IS_ERR(root))
- root->d_sb->s_iflags |= SB_I_USERNS_VISIBLE;
+ kfc = kzalloc(sizeof(struct kernfs_fs_context), GFP_KERNEL);
+ if (!kfc)
+ return -ENOMEM;
- return root;
+ kfc->ns_tag = netns = kobj_ns_grab_current(KOBJ_NS_TYPE_NET);
+ kfc->root = sysfs_root;
+ kfc->magic = SYSFS_MAGIC;
+ fc->fs_private = kfc;
+ fc->ops = &sysfs_fs_context_ops;
+ if (netns) {
+ put_user_ns(fc->user_ns);
+ fc->user_ns = get_user_ns(netns->user_ns);
+ }
+ fc->global = true;
+ return 0;
}
static void sysfs_kill_sb(struct super_block *sb)
@@ -52,10 +88,10 @@
}
static struct file_system_type sysfs_fs_type = {
- .name = "sysfs",
- .mount = sysfs_mount,
- .kill_sb = sysfs_kill_sb,
- .fs_flags = FS_USERNS_MOUNT,
+ .name = "sysfs",
+ .init_fs_context = sysfs_init_fs_context,
+ .kill_sb = sysfs_kill_sb,
+ .fs_flags = FS_USERNS_MOUNT,
};
int __init sysfs_init(void)
diff --git a/fs/sysfs/symlink.c b/fs/sysfs/symlink.c
index 215c225..c4deecc 100644
--- a/fs/sysfs/symlink.c
+++ b/fs/sysfs/symlink.c
@@ -23,7 +23,8 @@
{
struct kernfs_node *kn, *target = NULL;
- BUG_ON(!name || !parent);
+ if (WARN_ON(!name || !parent))
+ return -EINVAL;
/*
* We don't own @target_kobj and it may be removed at any time.