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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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11
zdev/src/udev_ccwgroup.c
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@@ -18,6 +18,7 @@
#include "attrib.h"
#include "ccwgroup.h"
#include "device.h"
#include "internal.h"
#include "misc.h"
#include "path.h"
#include "setting.h"
@@ -68,6 +69,12 @@ static void add_setting_from_entry(struct setting_list *list,
char *copy, *name, *end;
struct attrib *a;
/* ENV{zdev_var}="1" */
if (starts_with(entry->key, "ENV{zdev_") &&
strcmp(entry->op, "=") == 0) {
udev_add_internal_from_entry(list, entry, attribs);
return;
}
/* ATTR{[ccwgroup/0.0.f5f0]online}=1 */
if (strncmp(entry->key, "ATTR{[ccwgroup/", 10) != 0 ||
strcmp(entry->op, "=") != 0)
@@ -282,6 +289,10 @@ exit_code_t udev_ccwgroup_write_device(struct device *dev, bool autoconf)
fprintf(fd, "ATTR{[ccwgroup/%s]%s}=\"%s\"\n",
ccw_id, s->name, str->str);
}
} else if ((s->attrib && s->attrib->internal) ||
internal_by_name(s->name)) {
fprintf(fd, "ENV{zdev_%s}=\"%s\"\n",
internal_get_name(s->name), s->value);
} else {
fprintf(fd, "ATTR{[ccwgroup/%s]%s}=\"%s\"\n", ccw_id,
s->name, s->value);