Contributors: 15
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Tejun Heo |
245 |
46.31% |
19 |
37.25% |
| Eric W. Biedermann |
120 |
22.68% |
8 |
15.69% |
| Greg Kroah-Hartman |
39 |
7.37% |
6 |
11.76% |
| Mikulas Patocka |
28 |
5.29% |
3 |
5.88% |
| Dmitry Torokhov |
21 |
3.97% |
2 |
3.92% |
| Ming Lei |
20 |
3.78% |
1 |
1.96% |
| Andrew Morton |
18 |
3.40% |
1 |
1.96% |
| Patrick Mochel |
16 |
3.02% |
3 |
5.88% |
| Cornelia Huck |
10 |
1.89% |
2 |
3.92% |
| Roel Kluin |
4 |
0.76% |
1 |
1.96% |
| Robert P. J. Day |
3 |
0.57% |
1 |
1.96% |
| Alan Stern |
2 |
0.38% |
1 |
1.96% |
| Luis R. Rodriguez |
1 |
0.19% |
1 |
1.96% |
| Mauro Carvalho Chehab |
1 |
0.19% |
1 |
1.96% |
| Al Viro |
1 |
0.19% |
1 |
1.96% |
| Total |
529 |
|
51 |
|
// SPDX-License-Identifier: GPL-2.0
/*
* fs/sysfs/dir.c - sysfs core and dir operation implementation
*
* Copyright (c) 2001-3 Patrick Mochel
* Copyright (c) 2007 SUSE Linux Products GmbH
* Copyright (c) 2007 Tejun Heo <teheo@suse.de>
*
* Please see Documentation/filesystems/sysfs.rst for more information.
*/
#define pr_fmt(fmt) "sysfs: " fmt
#include <linux/fs.h>
#include <linux/kobject.h>
#include <linux/slab.h>
#include "sysfs.h"
DEFINE_SPINLOCK(sysfs_symlink_target_lock);
void sysfs_warn_dup(struct kernfs_node *parent, const char *name)
{
char *buf;
buf = kzalloc(PATH_MAX, GFP_KERNEL);
if (buf)
kernfs_path(parent, buf, PATH_MAX);
pr_warn("cannot create duplicate filename '%s/%s'\n", buf, name);
dump_stack();
kfree(buf);
}
/**
* sysfs_create_dir_ns - create a directory for an object with a namespace tag
* @kobj: object we're creating directory for
* @ns: the namespace tag to use
*/
int sysfs_create_dir_ns(struct kobject *kobj, const void *ns)
{
struct kernfs_node *parent, *kn;
kuid_t uid;
kgid_t gid;
if (WARN_ON(!kobj))
return -EINVAL;
if (kobj->parent)
parent = kobj->parent->sd;
else
parent = sysfs_root_kn;
if (!parent)
return -ENOENT;
kobject_get_ownership(kobj, &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)
sysfs_warn_dup(parent, kobject_name(kobj));
return PTR_ERR(kn);
}
kobj->sd = kn;
return 0;
}
/**
* sysfs_remove_dir - remove an object's directory.
* @kobj: object.
*
* The only thing special about this is that we remove any files in
* the directory before we remove the directory, and we've inlined
* what used to be sysfs_rmdir() below, instead of calling separately.
*/
void sysfs_remove_dir(struct kobject *kobj)
{
struct kernfs_node *kn = kobj->sd;
/*
* In general, kboject owner is responsible for ensuring removal
* doesn't race with other operations and sysfs doesn't provide any
* protection; however, when @kobj is used as a symlink target, the
* symlinking entity usually doesn't own @kobj and thus has no
* control over removal. @kobj->sd may be removed anytime
* and symlink code may end up dereferencing an already freed node.
*
* sysfs_symlink_target_lock synchronizes @kobj->sd
* disassociation against symlink operations so that symlink code
* can safely dereference @kobj->sd.
*/
spin_lock(&sysfs_symlink_target_lock);
kobj->sd = NULL;
spin_unlock(&sysfs_symlink_target_lock);
if (kn) {
WARN_ON_ONCE(kernfs_type(kn) != KERNFS_DIR);
kernfs_remove(kn);
}
}
int sysfs_rename_dir_ns(struct kobject *kobj, const char *new_name,
const void *new_ns)
{
struct kernfs_node *parent;
int ret;
parent = kernfs_get_parent(kobj->sd);
ret = kernfs_rename_ns(kobj->sd, parent, new_name, new_ns);
kernfs_put(parent);
return ret;
}
int sysfs_move_dir_ns(struct kobject *kobj, struct kobject *new_parent_kobj,
const void *new_ns)
{
struct kernfs_node *kn = kobj->sd;
struct kernfs_node *new_parent;
new_parent = new_parent_kobj && new_parent_kobj->sd ?
new_parent_kobj->sd : sysfs_root_kn;
return kernfs_rename_ns(kn, new_parent, kn->name, new_ns);
}
/**
* sysfs_create_mount_point - create an always empty directory
* @parent_kobj: kobject that will contain this always empty directory
* @name: The name of the always empty directory to add
*/
int sysfs_create_mount_point(struct kobject *parent_kobj, const char *name)
{
struct kernfs_node *kn, *parent = parent_kobj->sd;
kn = kernfs_create_empty_dir(parent, name);
if (IS_ERR(kn)) {
if (PTR_ERR(kn) == -EEXIST)
sysfs_warn_dup(parent, name);
return PTR_ERR(kn);
}
return 0;
}
EXPORT_SYMBOL_GPL(sysfs_create_mount_point);
/**
* sysfs_remove_mount_point - remove an always empty directory.
* @parent_kobj: kobject that will contain this always empty directory
* @name: The name of the always empty directory to remove
*
*/
void sysfs_remove_mount_point(struct kobject *parent_kobj, const char *name)
{
struct kernfs_node *parent = parent_kobj->sd;
kernfs_remove_by_name_ns(parent, name, NULL);
}
EXPORT_SYMBOL_GPL(sysfs_remove_mount_point);