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zdev: make site specific udev-rule for ccw

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The udev-rules must be modified to make it site-specific. The site
specific part of the rule should be executed only on the sites where the
devices belong. Change the generic udev rule to support the site-specific
udev-rule.

During boot, the current site-id is read from the LOADPARM which is
located at /sys/firmware/ipl. The zdev_id command reads this LOADPARM
and prints the SITE_ID based on the value. This SITE_ID is the
current site where the udev-rule is executing. Based on this assumption,
the rule is divided in to multiple blocks where each site block is executed
only for the corresponding sites.

The rule executes based on the value read from the LOADPARM.
1. When the LOADPARM specifies a site-id and if the current device has
   an associated configuration settings, it will be used.
2. When the LOADPARM specifies a site, and the current device does not
   have any associated configuration set, the udev rule uses the
   fallback configuration settings.
3. If the device does not have a fallback-configuration settings or any
   site-specific settings, no configurations will be used.

Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Vineeth Vijayan
2022-09-11 22:23:19 +02:00
committed by Jan Höppner
parent c8ad5f57d0
commit 2e89722ef0
6 changed files with 332 additions and 32 deletions
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59
zdev/src/udev.c
View File

@@ -23,6 +23,7 @@
#include "path.h"
#include "setting.h"
#include "udev.h"
#include "zdev_id.h"
int udev_need_settle = 0;
int udev_no_settle;
@@ -137,3 +138,61 @@ void udev_add_internal_from_entry(struct setting_list *list,
out:
free(copy);
}
/*
* Write the UDEV rule that determines the active SITE_ID
*/
exit_code_t udev_write_site_rule(void)
{
char *path, *name = "zdev-id";
exit_code_t rc = EXIT_OK;
FILE *fd;
/* Create file. */
path = path_get_zdev_rule(name);
if (!util_path_exists(path)) {
rc = path_create(path);
if (rc)
goto out;
}
fd = misc_fopen(path, "w");
if (!fd) {
error("Could not write to file %s: %s\n", path,
strerror(errno));
rc = EXIT_RUNTIME_ERROR;
goto out;
}
fprintf(fd, "# Generated by chzdev\n");
fprintf(fd, "\n");
/* We have to make sure that we are not trying to determine the SITE_ID
* for all the corresponding uevent. Check if the SITE_ID is already
* determined by reading the file /run/zdev_site_id; and if it is not
* available, execute the zdev_id program and determine the SITE_ID and
* create the new zdev_site_id file for next run.
*/
fprintf(fd, "TEST!=\"%s\", IMPORT{program}="
"\"%s/zdev_id\",GOTO=\"end\"\n", ZDEV_SITE_ID_FILE,
TOOLS_LIBDIR);
fprintf(fd, "IMPORT{file}=\"%s\"\n", ZDEV_SITE_ID_FILE);
fprintf(fd, "LABEL=\"end\"\n");
if (misc_fclose(fd))
warn("Could not close file %s: %s\n", path, strerror(errno));
out:
free(path);
return rc;
}
bool is_legacy_rule(struct util_udev_file *file)
{
struct util_udev_line_node *line;
util_list_iterate(&file->lines, line)
if (starts_with(line->line, SITE_BLOCK_START))
return false;
return true;
}