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device: add device_change_owner()

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Add a helper to change the owner of a device's sysfs entries. This
needs to happen when the ownership of a device is changed, e.g. when
moving network devices between network namespaces.
This function will be used to correctly account for 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 04:37:15 +01:00
committed by David S. Miller
parent 2c4f9401ce
commit b8f33e5d76
2 changed files with 117 additions and 0 deletions
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include/linux/device.h
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@@ -817,6 +817,7 @@ extern struct device *device_find_child_by_name(struct device *parent,
extern int device_rename(struct device *dev, const char *new_name);
extern int device_move(struct device *dev, struct device *new_parent,
enum dpm_order dpm_order);
extern int device_change_owner(struct device *dev, kuid_t kuid, kgid_t kgid);
extern const char *device_get_devnode(struct device *dev,
umode_t *mode, kuid_t *uid, kgid_t *gid,
const char **tmp);