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From 2240e7955d64260e94dd52a3ab9855d267c2af89 Mon Sep 17 00:00:00 2001
From: Tejun Heo <tj@kernel.org>
Date: Wed, 13 Jun 2018 14:16:35 -0700
Subject: [PATCH] core: add IODeviceLatencyTargetSec
This adds support for the following proposed latency based IO control
mechanism.
https://lkml.org/lkml/2018/6/5/428
(cherry picked from commit 6ae4283cb14c4e4a895f4bbba703804e4128c86c)
Resolves: #1831519
---
man/systemd.resource-control.xml | 29 +++++--
src/core/cgroup.c | 56 +++++++++++--
src/core/cgroup.h | 9 +++
src/core/dbus-cgroup.c | 111 ++++++++++++++++++++++++++
src/core/load-fragment-gperf.gperf.m4 | 1 +
src/core/load-fragment.c | 72 +++++++++++++++++
src/core/load-fragment.h | 1 +
src/shared/bus-unit-util.c | 31 +++++++
src/systemctl/systemctl.c | 22 +++++
9 files changed, 320 insertions(+), 12 deletions(-)
diff --git a/man/systemd.resource-control.xml b/man/systemd.resource-control.xml
index 4329742e94..b0064bf98f 100644
--- a/man/systemd.resource-control.xml
+++ b/man/systemd.resource-control.xml
@@ -417,11 +417,11 @@
<listitem>
<para>Set the per-device overall block I/O weight for the executed processes, if the unified control group
hierarchy is used on the system. Takes a space-separated pair of a file path and a weight value to specify
- the device specific weight value, between 1 and 10000. (Example: "/dev/sda 1000"). The file path may be
- specified as path to a block device node or as any other file, in which case the backing block device of the
- file system of the file is determined. This controls the <literal>io.weight</literal> control group
- attribute, which defaults to 100. Use this option multiple times to set weights for multiple devices. For
- details about this control group attribute, see <ulink
+ the device specific weight value, between 1 and 10000. (Example: <literal>/dev/sda 1000</literal>). The file
+ path may be specified as path to a block device node or as any other file, in which case the backing block
+ device of the file system of the file is determined. This controls the <literal>io.weight</literal> control
+ group attribute, which defaults to 100. Use this option multiple times to set weights for multiple devices.
+ For details about this control group attribute, see <ulink
url="https://www.kernel.org/doc/Documentation/cgroup-v2.txt">cgroup-v2.txt</ulink>.</para>
<para>Implies <literal>IOAccounting=true</literal>.</para>
@@ -482,6 +482,25 @@
</listitem>
</varlistentry>
+ <varlistentry>
+ <term><varname>IODeviceLatencyTargetSec=<replaceable>device</replaceable> <replaceable>target</replaceable></varname></term>
+
+ <listitem>
+ <para>Set the per-device average target I/O latency for the executed processes, if the unified control group
+ hierarchy is used on the system. Takes a file path and a timespan separated by a space to specify
+ the device specific latency target. (Example: "/dev/sda 25ms"). The file path may be specified
+ as path to a block device node or as any other file, in which case the backing block device of the file
+ system of the file is determined. This controls the <literal>io.latency</literal> control group
+ attribute. Use this option multiple times to set latency target for multiple devices. For details about this
+ control group attribute, see <ulink
+ url="https://www.kernel.org/doc/Documentation/cgroup-v2.txt">cgroup-v2.txt</ulink>.</para>
+
+ <para>Implies <literal>IOAccounting=true</literal>.</para>
+
+ <para>These settings are supported only if the unified control group hierarchy is used.</para>
+ </listitem>
+ </varlistentry>
+
<varlistentry>
<term><varname>IPAccounting=</varname></term>
diff --git a/src/core/cgroup.c b/src/core/cgroup.c
index 9e4c3c7dac..ad8219bd79 100644
--- a/src/core/cgroup.c
+++ b/src/core/cgroup.c
@@ -114,6 +114,15 @@ void cgroup_context_free_io_device_weight(CGroupContext *c, CGroupIODeviceWeight
free(w);
}
+void cgroup_context_free_io_device_latency(CGroupContext *c, CGroupIODeviceLatency *l) {
+ assert(c);
+ assert(l);
+
+ LIST_REMOVE(device_latencies, c->io_device_latencies, l);
+ free(l->path);
+ free(l);
+}
+
void cgroup_context_free_io_device_limit(CGroupContext *c, CGroupIODeviceLimit *l) {
assert(c);
assert(l);
@@ -147,6 +156,9 @@ void cgroup_context_done(CGroupContext *c) {
while (c->io_device_weights)
cgroup_context_free_io_device_weight(c, c->io_device_weights);
+ while (c->io_device_latencies)
+ cgroup_context_free_io_device_latency(c, c->io_device_latencies);
+
while (c->io_device_limits)
cgroup_context_free_io_device_limit(c, c->io_device_limits);
@@ -171,6 +183,7 @@ void cgroup_context_dump(CGroupContext *c, FILE* f, const char *prefix) {
_cleanup_free_ char *cpuset_mems = NULL;
CGroupIODeviceLimit *il;
CGroupIODeviceWeight *iw;
+ CGroupIODeviceLatency *l;
CGroupBlockIODeviceBandwidth *b;
CGroupBlockIODeviceWeight *w;
CGroupDeviceAllow *a;
@@ -256,11 +269,18 @@ void cgroup_context_dump(CGroupContext *c, FILE* f, const char *prefix) {
LIST_FOREACH(device_weights, iw, c->io_device_weights)
fprintf(f,
- "%sIODeviceWeight=%s %" PRIu64,
+ "%sIODeviceWeight=%s %" PRIu64 "\n",
prefix,
iw->path,
iw->weight);
+ LIST_FOREACH(device_latencies, l, c->io_device_latencies)
+ fprintf(f,
+ "%sIODeviceLatencyTargetSec=%s %s\n",
+ prefix,
+ l->path,
+ format_timespan(u, sizeof(u), l->target_usec, 1));
+
LIST_FOREACH(device_limits, il, c->io_device_limits) {
char buf[FORMAT_BYTES_MAX];
CGroupIOLimitType type;
@@ -573,6 +593,7 @@ static bool cgroup_context_has_io_config(CGroupContext *c) {
c->io_weight != CGROUP_WEIGHT_INVALID ||
c->startup_io_weight != CGROUP_WEIGHT_INVALID ||
c->io_device_weights ||
+ c->io_device_latencies ||
c->io_device_limits;
}
@@ -646,6 +667,26 @@ static void cgroup_apply_blkio_device_weight(Unit *u, const char *dev_path, uint
"Failed to set blkio.weight_device: %m");
}
+static void cgroup_apply_io_device_latency(Unit *u, const char *dev_path, usec_t target) {
+ char buf[DECIMAL_STR_MAX(dev_t)*2+2+7+DECIMAL_STR_MAX(uint64_t)+1];
+ dev_t dev;
+ int r;
+
+ r = lookup_block_device(dev_path, &dev);
+ if (r < 0)
+ return;
+
+ if (target != USEC_INFINITY)
+ xsprintf(buf, "%u:%u target=%" PRIu64 "\n", major(dev), minor(dev), target);
+ else
+ xsprintf(buf, "%u:%u target=max\n", major(dev), minor(dev));
+
+ r = cg_set_attribute("io", u->cgroup_path, "io.latency", buf);
+ if (r < 0)
+ log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
+ "Failed to set io.latency on cgroup %s: %m", u->cgroup_path);
+}
+
static void cgroup_apply_io_device_limit(Unit *u, const char *dev_path, uint64_t *limits) {
char limit_bufs[_CGROUP_IO_LIMIT_TYPE_MAX][DECIMAL_STR_MAX(uint64_t)];
char buf[DECIMAL_STR_MAX(dev_t)*2+2+(6+DECIMAL_STR_MAX(uint64_t)+1)*4];
@@ -827,13 +868,11 @@ static void cgroup_context_apply(
if (has_io) {
CGroupIODeviceWeight *w;
- /* FIXME: no way to reset this list */
LIST_FOREACH(device_weights, w, c->io_device_weights)
cgroup_apply_io_device_weight(u, w->path, w->weight);
} else if (has_blockio) {
CGroupBlockIODeviceWeight *w;
- /* FIXME: no way to reset this list */
LIST_FOREACH(device_weights, w, c->blockio_device_weights) {
weight = cgroup_weight_blkio_to_io(w->weight);
@@ -843,9 +882,15 @@ static void cgroup_context_apply(
cgroup_apply_io_device_weight(u, w->path, weight);
}
}
+
+ if (has_io) {
+ CGroupIODeviceLatency *l;
+
+ LIST_FOREACH(device_latencies, l, c->io_device_latencies)
+ cgroup_apply_io_device_latency(u, l->path, l->target_usec);
+ }
}
- /* Apply limits and free ones without config. */
if (has_io) {
CGroupIODeviceLimit *l;
@@ -902,7 +947,6 @@ static void cgroup_context_apply(
if (has_io) {
CGroupIODeviceWeight *w;
- /* FIXME: no way to reset this list */
LIST_FOREACH(device_weights, w, c->io_device_weights) {
weight = cgroup_weight_io_to_blkio(w->weight);
@@ -914,13 +958,11 @@ static void cgroup_context_apply(
} else if (has_blockio) {
CGroupBlockIODeviceWeight *w;
- /* FIXME: no way to reset this list */
LIST_FOREACH(device_weights, w, c->blockio_device_weights)
cgroup_apply_blkio_device_weight(u, w->path, w->weight);
}
}
- /* Apply limits and free ones without config. */
if (has_io) {
CGroupIODeviceLimit *l;
diff --git a/src/core/cgroup.h b/src/core/cgroup.h
index da10575394..f7365b4c46 100644
--- a/src/core/cgroup.h
+++ b/src/core/cgroup.h
@@ -13,6 +13,7 @@ typedef struct CGroupContext CGroupContext;
typedef struct CGroupDeviceAllow CGroupDeviceAllow;
typedef struct CGroupIODeviceWeight CGroupIODeviceWeight;
typedef struct CGroupIODeviceLimit CGroupIODeviceLimit;
+typedef struct CGroupIODeviceLatency CGroupIODeviceLatency;
typedef struct CGroupBlockIODeviceWeight CGroupBlockIODeviceWeight;
typedef struct CGroupBlockIODeviceBandwidth CGroupBlockIODeviceBandwidth;
@@ -52,6 +53,12 @@ struct CGroupIODeviceLimit {
uint64_t limits[_CGROUP_IO_LIMIT_TYPE_MAX];
};
+struct CGroupIODeviceLatency {
+ LIST_FIELDS(CGroupIODeviceLatency, device_latencies);
+ char *path;
+ usec_t target_usec;
+};
+
struct CGroupBlockIODeviceWeight {
LIST_FIELDS(CGroupBlockIODeviceWeight, device_weights);
char *path;
@@ -85,6 +92,7 @@ struct CGroupContext {
uint64_t startup_io_weight;
LIST_HEAD(CGroupIODeviceWeight, io_device_weights);
LIST_HEAD(CGroupIODeviceLimit, io_device_limits);
+ LIST_HEAD(CGroupIODeviceLatency, io_device_latencies);
uint64_t memory_low;
uint64_t memory_high;
@@ -137,6 +145,7 @@ CGroupMask cgroup_context_get_mask(CGroupContext *c);
void cgroup_context_free_device_allow(CGroupContext *c, CGroupDeviceAllow *a);
void cgroup_context_free_io_device_weight(CGroupContext *c, CGroupIODeviceWeight *w);
void cgroup_context_free_io_device_limit(CGroupContext *c, CGroupIODeviceLimit *l);
+void cgroup_context_free_io_device_latency(CGroupContext *c, CGroupIODeviceLatency *l);
void cgroup_context_free_blockio_device_weight(CGroupContext *c, CGroupBlockIODeviceWeight *w);
void cgroup_context_free_blockio_device_bandwidth(CGroupContext *c, CGroupBlockIODeviceBandwidth *b);
diff --git a/src/core/dbus-cgroup.c b/src/core/dbus-cgroup.c
index 30d4e83932..a1d3014d61 100644
--- a/src/core/dbus-cgroup.c
+++ b/src/core/dbus-cgroup.c
@@ -140,6 +140,36 @@ static int property_get_io_device_limits(
return sd_bus_message_close_container(reply);
}
+static int property_get_io_device_latency(
+ sd_bus *bus,
+ const char *path,
+ const char *interface,
+ const char *property,
+ sd_bus_message *reply,
+ void *userdata,
+ sd_bus_error *error) {
+
+ CGroupContext *c = userdata;
+ CGroupIODeviceLatency *l;
+ int r;
+
+ assert(bus);
+ assert(reply);
+ assert(c);
+
+ r = sd_bus_message_open_container(reply, 'a', "(st)");
+ if (r < 0)
+ return r;
+
+ LIST_FOREACH(device_latencies, l, c->io_device_latencies) {
+ r = sd_bus_message_append(reply, "(st)", l->path, l->target_usec);
+ if (r < 0)
+ return r;
+ }
+
+ return sd_bus_message_close_container(reply);
+}
+
static int property_get_blockio_device_weight(
sd_bus *bus,
const char *path,
@@ -314,6 +344,7 @@ const sd_bus_vtable bus_cgroup_vtable[] = {
SD_BUS_PROPERTY("IOWriteBandwidthMax", "a(st)", property_get_io_device_limits, 0, 0),
SD_BUS_PROPERTY("IOReadIOPSMax", "a(st)", property_get_io_device_limits, 0, 0),
SD_BUS_PROPERTY("IOWriteIOPSMax", "a(st)", property_get_io_device_limits, 0, 0),
+ SD_BUS_PROPERTY("IODeviceLatencyTargetUSec", "a(st)", property_get_io_device_latency, 0, 0),
SD_BUS_PROPERTY("BlockIOAccounting", "b", bus_property_get_bool, offsetof(CGroupContext, blockio_accounting), 0),
SD_BUS_PROPERTY("BlockIOWeight", "t", NULL, offsetof(CGroupContext, blockio_weight), 0),
SD_BUS_PROPERTY("StartupBlockIOWeight", "t", NULL, offsetof(CGroupContext, startup_blockio_weight), 0),
@@ -898,6 +929,86 @@ int bus_cgroup_set_property(
return 1;
+ } else if (streq(name, "IODeviceLatencyTargetUSec")) {
+ const char *path;
+ uint64_t target;
+ unsigned n = 0;
+
+ r = sd_bus_message_enter_container(message, 'a', "(st)");
+ if (r < 0)
+ return r;
+
+ while ((r = sd_bus_message_read(message, "(st)", &path, &target)) > 0) {
+
+ if (!path_is_normalized(path))
+ return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Path '%s' specified in %s= is not normalized.", name, path);
+
+ if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
+ CGroupIODeviceLatency *a = NULL, *b;
+
+ LIST_FOREACH(device_latencies, b, c->io_device_latencies) {
+ if (path_equal(b->path, path)) {
+ a = b;
+ break;
+ }
+ }
+
+ if (!a) {
+ a = new0(CGroupIODeviceLatency, 1);
+ if (!a)
+ return -ENOMEM;
+
+ a->path = strdup(path);
+ if (!a->path) {
+ free(a);
+ return -ENOMEM;
+ }
+ LIST_PREPEND(device_latencies, c->io_device_latencies, a);
+ }
+
+ a->target_usec = target;
+ }
+
+ n++;
+ }
+
+ r = sd_bus_message_exit_container(message);
+ if (r < 0)
+ return r;
+
+ if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
+ _cleanup_free_ char *buf = NULL;
+ _cleanup_fclose_ FILE *f = NULL;
+ char ts[FORMAT_TIMESPAN_MAX];
+ CGroupIODeviceLatency *a;
+ size_t size = 0;
+
+ if (n == 0) {
+ while (c->io_device_latencies)
+ cgroup_context_free_io_device_latency(c, c->io_device_latencies);
+ }
+
+ unit_invalidate_cgroup(u, CGROUP_MASK_IO);
+
+ f = open_memstream(&buf, &size);
+ if (!f)
+ return -ENOMEM;
+
+ (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
+
+ fputs("IODeviceLatencyTargetSec=\n", f);
+ LIST_FOREACH(device_latencies, a, c->io_device_latencies)
+ fprintf(f, "IODeviceLatencyTargetSec=%s %s\n",
+ a->path, format_timespan(ts, sizeof(ts), a->target_usec, 1));
+
+ r = fflush_and_check(f);
+ if (r < 0)
+ return r;
+ unit_write_setting(u, flags, name, buf);
+ }
+
+ return 1;
+
} else if (STR_IN_SET(name, "BlockIOReadBandwidth", "BlockIOWriteBandwidth")) {
const char *path;
bool read = true;
diff --git a/src/core/load-fragment-gperf.gperf.m4 b/src/core/load-fragment-gperf.gperf.m4
index 8883818ff2..23879c001f 100644
--- a/src/core/load-fragment-gperf.gperf.m4
+++ b/src/core/load-fragment-gperf.gperf.m4
@@ -185,6 +185,7 @@ $1.IOReadBandwidthMax, config_parse_io_limit, 0,
$1.IOWriteBandwidthMax, config_parse_io_limit, 0, offsetof($1, cgroup_context)
$1.IOReadIOPSMax, config_parse_io_limit, 0, offsetof($1, cgroup_context)
$1.IOWriteIOPSMax, config_parse_io_limit, 0, offsetof($1, cgroup_context)
+$1.IODeviceLatencyTargetSec, config_parse_io_device_latency, 0, offsetof($1, cgroup_context)
$1.BlockIOAccounting, config_parse_bool, 0, offsetof($1, cgroup_context.blockio_accounting)
$1.BlockIOWeight, config_parse_blockio_weight, 0, offsetof($1, cgroup_context.blockio_weight)
$1.StartupBlockIOWeight, config_parse_blockio_weight, 0, offsetof($1, cgroup_context.startup_blockio_weight)
diff --git a/src/core/load-fragment.c b/src/core/load-fragment.c
index 9b2724307d..1e22013b75 100644
--- a/src/core/load-fragment.c
+++ b/src/core/load-fragment.c
@@ -3383,6 +3383,77 @@ int config_parse_io_device_weight(
return 0;
}
+int config_parse_io_device_latency(
+ const char *unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ _cleanup_free_ char *path = NULL, *resolved = NULL;
+ CGroupIODeviceLatency *l;
+ CGroupContext *c = data;
+ const char *p = rvalue;
+ usec_t usec;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+
+ if (isempty(rvalue)) {
+ while (c->io_device_latencies)
+ cgroup_context_free_io_device_latency(c, c->io_device_latencies);
+
+ return 0;
+ }
+
+ r = extract_first_word(&p, &path, NULL, EXTRACT_QUOTES);
+ if (r == -ENOMEM)
+ return log_oom();
+ if (r < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, r,
+ "Invalid syntax, ignoring: %s", rvalue);
+ return 0;
+ }
+ if (r == 0 || isempty(p)) {
+ log_syntax(unit, LOG_WARNING, filename, line, 0,
+ "Failed to extract device path and latency from '%s', ignoring.", rvalue);
+ return 0;
+ }
+
+ r = unit_full_printf(userdata, path, &resolved);
+ if (r < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, r,
+ "Failed to resolve unit specifiers in '%s', ignoring: %m", path);
+ return 0;
+ }
+
+ r = path_simplify_and_warn(resolved, 0, unit, filename, line, lvalue);
+ if (r < 0)
+ return 0;
+
+ if (parse_sec(p, &usec) < 0) {
+ log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse timer value, ignoring: %s", p);
+ return 0;
+ }
+
+ l = new0(CGroupIODeviceLatency, 1);
+ if (!l)
+ return log_oom();
+
+ l->path = TAKE_PTR(resolved);
+ l->target_usec = usec;
+
+ LIST_PREPEND(device_latencies, c->io_device_latencies, l);
+ return 0;
+}
+
int config_parse_io_limit(
const char *unit,
const char *filename,
@@ -4572,6 +4643,7 @@ void unit_dump_config_items(FILE *f) {
{ config_parse_device_policy, "POLICY" },
{ config_parse_io_limit, "LIMIT" },
{ config_parse_io_device_weight, "DEVICEWEIGHT" },
+ { config_parse_io_device_latency, "DEVICELATENCY" },
{ config_parse_blockio_bandwidth, "BANDWIDTH" },
{ config_parse_blockio_weight, "WEIGHT" },
{ config_parse_blockio_device_weight, "DEVICEWEIGHT" },
diff --git a/src/core/load-fragment.h b/src/core/load-fragment.h
index 424fa478a7..65a94d53cc 100644
--- a/src/core/load-fragment.h
+++ b/src/core/load-fragment.h
@@ -68,6 +68,7 @@ CONFIG_PARSER_PROTOTYPE(config_parse_tasks_max);
CONFIG_PARSER_PROTOTYPE(config_parse_delegate);
CONFIG_PARSER_PROTOTYPE(config_parse_device_policy);
CONFIG_PARSER_PROTOTYPE(config_parse_device_allow);
+CONFIG_PARSER_PROTOTYPE(config_parse_io_device_latency);
CONFIG_PARSER_PROTOTYPE(config_parse_io_device_weight);
CONFIG_PARSER_PROTOTYPE(config_parse_io_limit);
CONFIG_PARSER_PROTOTYPE(config_parse_blockio_weight);
diff --git a/src/shared/bus-unit-util.c b/src/shared/bus-unit-util.c
index e0b2cfb170..3c1ecf2027 100644
--- a/src/shared/bus-unit-util.c
+++ b/src/shared/bus-unit-util.c
@@ -566,6 +566,37 @@ static int bus_append_cgroup_property(sd_bus_message *m, const char *field, cons
return 1;
}
+ if (streq(field, "IODeviceLatencyTargetSec")) {
+ const char *field_usec = "IODeviceLatencyTargetUSec";
+
+ if (isempty(eq))
+ r = sd_bus_message_append(m, "(sv)", field_usec, "a(st)", USEC_INFINITY);
+ else {
+ const char *path, *target, *e;
+ usec_t usec;
+
+ e = strchr(eq, ' ');
+ if (!e) {
+ log_error("Failed to parse %s value %s.", field, eq);
+ return -EINVAL;
+ }
+
+ path = strndupa(eq, e - eq);
+ target = e+1;
+
+ r = parse_sec(target, &usec);
+ if (r < 0)
+ return log_error_errno(r, "Failed to parse %s value %s: %m", field, target);
+
+ r = sd_bus_message_append(m, "(sv)", field_usec, "a(st)", 1, path, usec);
+ }
+
+ if (r < 0)
+ return bus_log_create_error(r);
+
+ return 1;
+ }
+
if (STR_IN_SET(field, "IPAddressAllow", "IPAddressDeny")) {
unsigned char prefixlen;
union in_addr_union prefix = {};
diff --git a/src/systemctl/systemctl.c b/src/systemctl/systemctl.c
index a3074bc5e3..559e49f104 100644
--- a/src/systemctl/systemctl.c
+++ b/src/systemctl/systemctl.c
@@ -4875,6 +4875,28 @@ static int print_property(const char *name, sd_bus_message *m, bool value, bool
return 1;
+ } else if (contents[0] == SD_BUS_TYPE_STRUCT_BEGIN &&
+ streq(name, "IODeviceLatencyTargetUSec")) {
+ char ts[FORMAT_TIMESPAN_MAX];
+ const char *path;
+ uint64_t target;
+
+ r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "(st)");
+ if (r < 0)
+ return bus_log_parse_error(r);
+
+ while ((r = sd_bus_message_read(m, "(st)", &path, &target)) > 0)
+ print_prop(name, "%s %s", strna(path),
+ format_timespan(ts, sizeof(ts), target, 1));
+ if (r < 0)
+ return bus_log_parse_error(r);
+
+ r = sd_bus_message_exit_container(m);
+ if (r < 0)
+ return bus_log_parse_error(r);
+
+ return 1;
+
} else if (contents[0] == SD_BUS_TYPE_BYTE && streq(name, "StandardInputData")) {
_cleanup_free_ char *h = NULL;
const void *p;
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