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zdev: add copy_pair attribute for DASD devices

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The DASD device driver has a new attribute copy_pair to make storage
server copy pairs known to the driver.
Add this attribute to zdev.

Usage example:

Add two copy pairs 1000,2000 and 1000,3000 to a DASD device 1000
$ chzdev dasd 1000 copy_pairs=1000,2000 copy_pairs=1000,3000

or

$ chzdev dasd 1000 copy_pairs="1000,2000 1000,3000"

To add a third copy pair later on:
$ chzdev dasd 1000 copy_pairs=1000,4000

To remove all copy pairs from the device 1000:
$ chzdev dasd 1000 -r copy_pairs

Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Stefan Haberland
2022-08-09 16:17:23 +02:00
committed by Jan Höppner
parent e742d1c9ae
commit f654b971d0
1 changed files with 93 additions and 0 deletions
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93
zdev/src/dasd.c
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@@ -137,6 +137,21 @@ static struct attrib dasd_attr_readonly = {
.accept = ACCEPT_ARRAY(ACCEPT_RANGE(0, 1)),
};
static struct attrib dasd_attr_copy_pair = {
.name = "copy_pair",
.title = "Modify copy-pair relations",
.desc = "Make a copy-pair relation for this device known to the DASD "
"driver.\n"
"A copy-pair is a comma-separated pair of device bus-IDs\n"
"<primary>,<secondary>.\n"
"Example: 0.0.1000,0.0.2000\n"
"Up to 4 copy-pairs are accepted by the DASD driver for each "
"device.\n",
.unstable = 1,
.multi = 1,
.activerem = 1,
};
static struct attrib dasd_attr_erplog = {
.name = "erplog",
.title = "Enable logging of Error Recovery Processing",
@@ -600,6 +615,81 @@ persistent:
return rc;
}
/* Remove all entries from the copy_pair attribute by writing 'clear' to it. */
static void dasd_clear_copy_pair(struct setting *s)
{
free(s->value);
s->value = misc_strdup("clear");
strlist_free(s->values);
s->values = strlist_new();
strlist_add(s->values, "clear");
s->removed = 0;
s->modified = 1;
}
/*
* Copy-pair values may contain multiple values in one line
* those need to be split up and put in multiple values entries
* delimiter is " " and "\n" depending on the source
* values read from sysfs have " " as delimiter and values from
* zdev have "\n"
*/
static void dasd_split_copy_pair(struct setting *s)
{
struct util_list *new = NULL;
struct strlist_node *node;
new = strlist_new();
util_list_iterate(s->values, node)
strlist_add_multi(new, node->str, "\n ", 0);
strlist_free(s->values);
s->values = new;
}
/*
* For persistent configurations one value per values[] entry is required
* to achieve a correct multi-line copy-pair statement in the resulting
* udev-rule.
*/
static exit_code_t dasd_st_configure_persistent(struct subtype *st,
struct device *dev)
{
struct setting *s;
util_list_iterate(&dev->persistent.settings->list, s) {
if (strcmp(s->name, "copy_pair") == 0)
dasd_split_copy_pair(s);
}
return st->super->configure_persistent(st, dev);
}
/*
* For active configurations one value per values[] entry is required to
* correctly operate the sysfs attribute.
*
* In case of removal the string "clear" has to be written to the
* value and values[] entry.
*/
static exit_code_t dasd_st_configure_active(struct subtype *st,
struct device *dev)
{
struct setting *s;
util_list_iterate(&dev->active.settings->list, s) {
if (strcmp(s->name, "copy_pair") != 0)
continue;
if (s->removed)
dasd_clear_copy_pair(s);
else
dasd_split_copy_pair(s);
}
return st->super->configure_active(st, dev);
}
/*
* DASD device sub-types.
*/
@@ -634,10 +724,13 @@ struct subtype dasd_subtype_eckd = {
&dasd_attr_last_known_reservation_state,
&dasd_attr_safe_offline,
&dasd_attr_fc_security,
&dasd_attr_copy_pair,
&internal_attr_early,
),
.unknown_dev_attribs = 1,
.configure_active = &dasd_st_configure_active,
.configure_persistent = &dasd_st_configure_persistent,
.check_pre_configure = &dasd_st_check_pre_configure,
.add_modules = &dasd_st_add_modules,
};