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sysfs: add sysfs_file_change_owner()

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Add helpers to change the owner of a sysfs files.
This function will be used to correctly account for kobject ownership
changes, e.g. when moving network devices between network namespaces.

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christian Brauner
2020-02-27 04:37:11 +01:00
committed by David S. Miller
parent d1c73cbdf9
commit f70ce18568
2 changed files with 57 additions and 0 deletions
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10
include/linux/sysfs.h
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@@ -310,6 +310,9 @@ static inline void sysfs_enable_ns(struct kernfs_node *kn)
return kernfs_enable_ns(kn);
}
int sysfs_file_change_owner(struct kobject *kobj, const char *name, kuid_t kuid,
kgid_t kgid);
#else /* CONFIG_SYSFS */
static inline int sysfs_create_dir_ns(struct kobject *kobj, const void *ns)
@@ -522,6 +525,13 @@ static inline void sysfs_enable_ns(struct kernfs_node *kn)
{
}
static inline int sysfs_file_change_owner(struct kobject *kobj,
const char *name, kuid_t kuid,
kgid_t kgid)
{
return 0;
}
#endif /* CONFIG_SYSFS */
static inline int __must_check sysfs_create_file(struct kobject *kobj,