[PATCH 3.16.y-ckt 003/130] sysfs: Create mountpoints with sysfs_create_mount_point

From: Luis Henriques
Date: Fri Sep 04 2015 - 09:59:43 EST

3.16.7-ckt17 -stable review patch. If anyone has any objections, please let me know.

------------------

From: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>

commit f9bb48825a6b5d02f4cabcc78967c75db903dcdc upstream.

This allows for better documentation in the code and
it allows for a simpler and fully correct version of
fs_fully_visible to be written.

The mount points converted and their filesystems are:
/sys/hypervisor/s390/ s390_hypfs
/sys/kernel/config/ configfs
/sys/kernel/debug/ debugfs
/sys/firmware/efi/efivars/ efivarfs
/sys/fs/fuse/connections/ fusectl
/sys/fs/pstore/ pstore
/sys/kernel/tracing/ tracefs
/sys/fs/cgroup/ cgroup
/sys/kernel/security/ securityfs
/sys/fs/selinux/ selinuxfs
/sys/fs/smackfs/ smackfs

Acked-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Signed-off-by: Seth Forshee <seth.forshee@xxxxxxxxxxxxx>
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
---
arch/s390/hypfs/inode.c | 12 ++++--------
drivers/firmware/efi/efi.c | 6 ++----
fs/configfs/mount.c | 10 ++++------
fs/debugfs/inode.c | 11 ++++-------
fs/fuse/inode.c | 9 +++------
fs/pstore/inode.c | 12 ++++--------
kernel/cgroup.c | 10 ++++------
security/inode.c | 10 ++++------
security/selinux/selinuxfs.c | 11 +++++------
security/smack/smackfs.c | 8 ++++----
10 files changed, 38 insertions(+), 61 deletions(-)

diff --git a/arch/s390/hypfs/inode.c b/arch/s390/hypfs/inode.c
index c952b981e4f2..e86bbf105bdb 100644
--- a/arch/s390/hypfs/inode.c
+++ b/arch/s390/hypfs/inode.c
@@ -461,8 +461,6 @@ static const struct super_operations hypfs_s_ops = {
.show_options = hypfs_show_options,
};

-static struct kobject *s390_kobj;
-
static int __init hypfs_init(void)
{
int rc;
@@ -482,18 +480,16 @@ static int __init hypfs_init(void)
rc = -ENODATA;
goto fail_hypfs_vm_exit;
}
- s390_kobj = kobject_create_and_add("s390", hypervisor_kobj);
- if (!s390_kobj) {
- rc = -ENOMEM;
+ rc = sysfs_create_mount_point(hypervisor_kobj, "s390");
+ if (rc)
goto fail_hypfs_sprp_exit;
- }
rc = register_filesystem(&hypfs_type);
if (rc)
goto fail_filesystem;
return 0;

fail_filesystem:
- kobject_put(s390_kobj);
+ sysfs_remove_mount_point(hypervisor_kobj, "s390");
fail_hypfs_sprp_exit:
hypfs_sprp_exit();
fail_hypfs_vm_exit:
@@ -509,7 +505,7 @@ fail_dbfs_exit:
static void __exit hypfs_exit(void)
{
unregister_filesystem(&hypfs_type);
- kobject_put(s390_kobj);
+ sysfs_remove_mount_point(hypervisor_kobj, "s390");
hypfs_sprp_exit();
hypfs_vm_exit();
hypfs_diag_exit();
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index dc79346689e6..583ef8d17e07 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -41,7 +41,6 @@ struct efi __read_mostly efi = {
EXPORT_SYMBOL(efi);

static struct kobject *efi_kobj;
-static struct kobject *efivars_kobj;

/*
* Let's not leave out systab information that snuck into
@@ -174,10 +173,9 @@ static int __init efisubsys_init(void)
goto err_remove_group;

/* and the standard mountpoint for efivarfs */
- efivars_kobj = kobject_create_and_add("efivars", efi_kobj);
- if (!efivars_kobj) {
+ error = sysfs_create_mount_point(efi_kobj, "efivars");
+ if (error) {
pr_err("efivars: Subsystem registration failed.\n");
- error = -ENOMEM;
goto err_remove_group;
}

diff --git a/fs/configfs/mount.c b/fs/configfs/mount.c
index f6c285833390..e9aa82098c39 100644
--- a/fs/configfs/mount.c
+++ b/fs/configfs/mount.c
@@ -129,8 +129,6 @@ void configfs_release_fs(void)
}


-static struct kobject *config_kobj;
-
static int __init configfs_init(void)
{
int err = -ENOMEM;
@@ -141,8 +139,8 @@ static int __init configfs_init(void)
if (!configfs_dir_cachep)
goto out;

- config_kobj = kobject_create_and_add("config", kernel_kobj);
- if (!config_kobj)
+ err = sysfs_create_mount_point(kernel_kobj, "config");
+ if (err)
goto out2;

err = configfs_inode_init();
@@ -158,7 +156,7 @@ out4:
pr_err("Unable to register filesystem!\n");
configfs_inode_exit();
out3:
- kobject_put(config_kobj);
+ sysfs_remove_mount_point(kernel_kobj, "config");
out2:
kmem_cache_destroy(configfs_dir_cachep);
configfs_dir_cachep = NULL;
@@ -169,7 +167,7 @@ out:
static void __exit configfs_exit(void)
{
unregister_filesystem(&configfs_fs_type);
- kobject_put(config_kobj);
+ sysfs_remove_mount_point(kernel_kobj, "config");
kmem_cache_destroy(configfs_dir_cachep);
configfs_dir_cachep = NULL;
configfs_inode_exit();
diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
index 0c6ba4ef00a0..75c865bd376d 100644
--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -668,20 +668,17 @@ bool debugfs_initialized(void)
}
EXPORT_SYMBOL_GPL(debugfs_initialized);

-
-static struct kobject *debug_kobj;
-
static int __init debugfs_init(void)
{
int retval;

- debug_kobj = kobject_create_and_add("debug", kernel_kobj);
- if (!debug_kobj)
- return -EINVAL;
+ retval = sysfs_create_mount_point(kernel_kobj, "debug");
+ if (retval)
+ return retval;

retval = register_filesystem(&debug_fs_type);
if (retval)
- kobject_put(debug_kobj);
+ sysfs_remove_mount_point(kernel_kobj, "debug");
else
debugfs_registered = true;

diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 9e3f6cfee2fb..6abafb11f214 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -1261,7 +1261,6 @@ static void fuse_fs_cleanup(void)
}

static struct kobject *fuse_kobj;
-static struct kobject *connections_kobj;

static int fuse_sysfs_init(void)
{
@@ -1273,11 +1272,9 @@ static int fuse_sysfs_init(void)
goto out_err;
}

- connections_kobj = kobject_create_and_add("connections", fuse_kobj);
- if (!connections_kobj) {
- err = -ENOMEM;
+ err = sysfs_create_mount_point(fuse_kobj, "connections");
+ if (err)
goto out_fuse_unregister;
- }

return 0;

@@ -1289,7 +1286,7 @@ static int fuse_sysfs_init(void)

static void fuse_sysfs_cleanup(void)
{
- kobject_put(connections_kobj);
+ sysfs_remove_mount_point(fuse_kobj, "connections");
kobject_put(fuse_kobj);
}

diff --git a/fs/pstore/inode.c b/fs/pstore/inode.c
index fafb7a02a5d6..3b172f651894 100644
--- a/fs/pstore/inode.c
+++ b/fs/pstore/inode.c
@@ -430,22 +430,18 @@ static struct file_system_type pstore_fs_type = {
.kill_sb = pstore_kill_sb,
};

-static struct kobject *pstore_kobj;
-
static int __init init_pstore_fs(void)
{
- int err = 0;
+ int err;

/* Create a convenient mount point for people to access pstore */
- pstore_kobj = kobject_create_and_add("pstore", fs_kobj);
- if (!pstore_kobj) {
- err = -ENOMEM;
+ err = sysfs_create_mount_point(fs_kobj, "pstore");
+ if (err)
goto out;
- }

err = register_filesystem(&pstore_fs_type);
if (err < 0)
- kobject_put(pstore_kobj);
+ sysfs_remove_mount_point(fs_kobj, "pstore");

out:
return err;
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 0a46b2aa9dfb..44fadfb287bf 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1848,8 +1848,6 @@ static struct file_system_type cgroup_fs_type = {
.kill_sb = cgroup_kill_sb,
};

-static struct kobject *cgroup_kobj;
-
/**
* task_cgroup_path - cgroup path of a task in the first cgroup hierarchy
* @task: target task
@@ -4822,13 +4820,13 @@ int __init cgroup_init(void)
}
}

- cgroup_kobj = kobject_create_and_add("cgroup", fs_kobj);
- if (!cgroup_kobj)
- return -ENOMEM;
+ err = sysfs_create_mount_point(fs_kobj, "cgroup");
+ if (err)
+ return err;

err = register_filesystem(&cgroup_fs_type);
if (err < 0) {
- kobject_put(cgroup_kobj);
+ sysfs_remove_mount_point(fs_kobj, "cgroup");
return err;
}

diff --git a/security/inode.c b/security/inode.c
index 43ce6e19015f..617c7ce219e8 100644
--- a/security/inode.c
+++ b/security/inode.c
@@ -215,19 +215,17 @@ void securityfs_remove(struct dentry *dentry)
}
EXPORT_SYMBOL_GPL(securityfs_remove);

-static struct kobject *security_kobj;
-
static int __init securityfs_init(void)
{
int retval;

- security_kobj = kobject_create_and_add("security", kernel_kobj);
- if (!security_kobj)
- return -EINVAL;
+ retval = sysfs_create_mount_point(kernel_kobj, "security");
+ if (retval)
+ return retval;

retval = register_filesystem(&fs_type);
if (retval)
- kobject_put(security_kobj);
+ sysfs_remove_mount_point(kernel_kobj, "security");
return retval;
}

diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c
index 138949a31eab..181fcd3994a8 100644
--- a/security/selinux/selinuxfs.c
+++ b/security/selinux/selinuxfs.c
@@ -1899,7 +1899,6 @@ static struct file_system_type sel_fs_type = {
};

struct vfsmount *selinuxfs_mount;
-static struct kobject *selinuxfs_kobj;

static int __init init_sel_fs(void)
{
@@ -1908,13 +1907,13 @@ static int __init init_sel_fs(void)
if (!selinux_enabled)
return 0;

- selinuxfs_kobj = kobject_create_and_add("selinux", fs_kobj);
- if (!selinuxfs_kobj)
- return -ENOMEM;
+ err = sysfs_create_mount_point(fs_kobj, "selinux");
+ if (err)
+ return err;

err = register_filesystem(&sel_fs_type);
if (err) {
- kobject_put(selinuxfs_kobj);
+ sysfs_remove_mount_point(fs_kobj, "selinux");
return err;
}

@@ -1933,7 +1932,7 @@ __initcall(init_sel_fs);
#ifdef CONFIG_SECURITY_SELINUX_DISABLE
void exit_sel_fs(void)
{
- kobject_put(selinuxfs_kobj);
+ sysfs_remove_mount_point(fs_kobj, "selinux");
kern_unmount(selinuxfs_mount);
unregister_filesystem(&sel_fs_type);
}
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c
index 32b248820840..8608fd72580a 100644
--- a/security/smack/smackfs.c
+++ b/security/smack/smackfs.c
@@ -2136,16 +2136,16 @@ static const struct file_operations smk_revoke_subj_ops = {
.llseek = generic_file_llseek,
};

-static struct kset *smackfs_kset;
/**
* smk_init_sysfs - initialize /sys/fs/smackfs
*
*/
static int smk_init_sysfs(void)
{
- smackfs_kset = kset_create_and_add("smackfs", NULL, fs_kobj);
- if (!smackfs_kset)
- return -ENOMEM;
+ int err;
+ err = sysfs_create_mount_point(fs_kobj, "smackfs");
+ if (err)
+ return err;
return 0;
}

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