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zdev: Implement internal device attributes

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This change adds base infrastructure for implementing internal device
attributes. In the context of the zdev tools, an internal device
attribute is a new type of device attribute with the following
characteristics:

  - Can be set and removed like normal device attributes
  - Affects zdev-internal handling only
  - Does not correspond to an actual device attribute, that is
    it has no representation in SysFS
  - Can not be set in the active configuration
  - Name starts with "zdev:" to prevent conflicts with actual
    device attributes

Values for internal device attributes are stored in udev rules alongside
the normal persistent configuration of a device. They are encoded as
udev environment variables. Note that they have no further effect on
udev processing.

Signed-off-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Peter Oberparleiter
2017-09-01 11:05:58 +02:00
committed by Jan Höppner
parent 3c5644ccfd
commit c0392efa39
12 changed files with 220 additions and 8 deletions
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7
zdev/include/udev.h
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@@ -13,6 +13,9 @@
#include "lib/util_list.h"
#include "exit_code.h"
struct attrib;
struct setting_list;
extern int udev_need_settle;
extern int udev_no_settle;
@@ -46,4 +49,8 @@ exit_code_t udev_remove_rule(const char *type, const char *id, bool autoconf);
void udev_settle(void);
void udev_add_internal_from_entry(struct setting_list *list,
struct udev_entry_node *entry,
struct attrib **attribs);
#endif /* UDEV_H */