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dbus-cgroup.c
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dbus-cgroup.c
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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2013 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include "bus-util.h"
#include "path-util.h"
#include "cgroup-util.h"
#include "cgroup.h"
#include "dbus-cgroup.h"
static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_cgroup_device_policy, cgroup_device_policy, CGroupDevicePolicy);
static int property_get_blockio_device_weight(
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;
CGroupBlockIODeviceWeight *w;
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_weights, w, c->blockio_device_weights) {
r = sd_bus_message_append(reply, "(st)", w->path, w->weight);
if (r < 0)
return r;
}
return sd_bus_message_close_container(reply);
}
static int property_get_blockio_device_bandwidths(
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;
CGroupBlockIODeviceBandwidth *b;
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_bandwidths, b, c->blockio_device_bandwidths) {
if (streq(property, "BlockIOReadBandwidth") != b->read)
continue;
r = sd_bus_message_append(reply, "(st)", b->path, b->bandwidth);
if (r < 0)
return r;
}
return sd_bus_message_close_container(reply);
}
static int property_get_device_allow(
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;
CGroupDeviceAllow *a;
int r;
assert(bus);
assert(reply);
assert(c);
r = sd_bus_message_open_container(reply, 'a', "(ss)");
if (r < 0)
return r;
LIST_FOREACH(device_allow, a, c->device_allow) {
unsigned k = 0;
char rwm[4];
if (a->r)
rwm[k++] = 'r';
if (a->w)
rwm[k++] = 'w';
if (a->m)
rwm[k++] = 'm';
rwm[k] = 0;
r = sd_bus_message_append(reply, "(ss)", a->path, rwm);
if (r < 0)
return r;
}
return sd_bus_message_close_container(reply);
}
static int property_get_ulong_as_u64(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *error) {
unsigned long *ul = userdata;
assert(bus);
assert(reply);
assert(ul);
return sd_bus_message_append(reply, "t", *ul == (unsigned long) -1 ? (uint64_t) -1 : (uint64_t) *ul);
}
const sd_bus_vtable bus_cgroup_vtable[] = {
SD_BUS_VTABLE_START(0),
SD_BUS_PROPERTY("CPUAccounting", "b", bus_property_get_bool, offsetof(CGroupContext, cpu_accounting), 0),
SD_BUS_PROPERTY("CPUShares", "t", property_get_ulong_as_u64, offsetof(CGroupContext, cpu_shares), 0),
SD_BUS_PROPERTY("StartupCPUShares", "t", property_get_ulong_as_u64, offsetof(CGroupContext, startup_cpu_shares), 0),
SD_BUS_PROPERTY("CPUQuotaPerSecUSec", "t", bus_property_get_usec, offsetof(CGroupContext, cpu_quota_per_sec_usec), 0),
SD_BUS_PROPERTY("BlockIOAccounting", "b", bus_property_get_bool, offsetof(CGroupContext, blockio_accounting), 0),
SD_BUS_PROPERTY("BlockIOWeight", "t", property_get_ulong_as_u64, offsetof(CGroupContext, blockio_weight), 0),
SD_BUS_PROPERTY("StartupBlockIOWeight", "t", property_get_ulong_as_u64, offsetof(CGroupContext, startup_blockio_weight), 0),
SD_BUS_PROPERTY("BlockIODeviceWeight", "a(st)", property_get_blockio_device_weight, 0, 0),
SD_BUS_PROPERTY("BlockIOReadBandwidth", "a(st)", property_get_blockio_device_bandwidths, 0, 0),
SD_BUS_PROPERTY("BlockIOWriteBandwidth", "a(st)", property_get_blockio_device_bandwidths, 0, 0),
SD_BUS_PROPERTY("MemoryAccounting", "b", bus_property_get_bool, offsetof(CGroupContext, memory_accounting), 0),
SD_BUS_PROPERTY("MemoryLimit", "t", NULL, offsetof(CGroupContext, memory_limit), 0),
SD_BUS_PROPERTY("DevicePolicy", "s", property_get_cgroup_device_policy, offsetof(CGroupContext, device_policy), 0),
SD_BUS_PROPERTY("DeviceAllow", "a(ss)", property_get_device_allow, 0, 0),
SD_BUS_VTABLE_END
};
int bus_cgroup_set_property(
Unit *u,
CGroupContext *c,
const char *name,
sd_bus_message *message,
UnitSetPropertiesMode mode,
sd_bus_error *error) {
int r;
assert(u);
assert(c);
assert(name);
assert(message);
if (streq(name, "CPUAccounting")) {
int b;
r = sd_bus_message_read(message, "b", &b);
if (r < 0)
return r;
if (mode != UNIT_CHECK) {
c->cpu_accounting = b;
u->cgroup_realized_mask &= ~CGROUP_CPUACCT;
unit_write_drop_in_private(u, mode, name, b ? "CPUAccounting=yes" : "CPUAccounting=no");
}
return 1;
} else if (streq(name, "CPUShares")) {
uint64_t u64;
unsigned long ul;
r = sd_bus_message_read(message, "t", &u64);
if (r < 0)
return r;
if (u64 == (uint64_t) -1)
ul = (unsigned long) -1;
else {
ul = (unsigned long) u64;
if (ul <= 0 || (uint64_t) ul != u64)
return sd_bus_error_set_errnof(error, EINVAL, "CPUShares value out of range");
}
if (mode != UNIT_CHECK) {
c->cpu_shares = ul;
u->cgroup_realized_mask &= ~CGROUP_CPU;
unit_write_drop_in_private_format(u, mode, name, "CPUShares=%lu", ul);
}
return 1;
} else if (streq(name, "StartupCPUShares")) {
uint64_t u64;
unsigned long ul;
r = sd_bus_message_read(message, "t", &u64);
if (r < 0)
return r;
if (u64 == (uint64_t) -1)
ul = (unsigned long) -1;
else {
ul = (unsigned long) u64;
if (ul <= 0 || (uint64_t) ul != u64)
return sd_bus_error_set_errnof(error, EINVAL, "StartupCPUShares value out of range");
}
if (mode != UNIT_CHECK) {
c->startup_cpu_shares = ul;
u->cgroup_realized_mask &= ~CGROUP_CPU;
unit_write_drop_in_private_format(u, mode, name, "StartupCPUShares=%lu", ul);
}
return 1;
} else if (streq(name, "CPUQuotaPerSecUSec")) {
uint64_t u64;
r = sd_bus_message_read(message, "t", &u64);
if (r < 0)
return r;
if (u64 <= 0)
return sd_bus_error_set_errnof(error, EINVAL, "CPUQuotaPerSecUSec value out of range");
if (mode != UNIT_CHECK) {
c->cpu_quota_per_sec_usec = u64;
u->cgroup_realized_mask &= ~CGROUP_CPU;
unit_write_drop_in_private_format(u, mode, "CPUQuota", "CPUQuota=%0.f%%", (double) (c->cpu_quota_per_sec_usec / 10000));
}
return 1;
} else if (streq(name, "BlockIOAccounting")) {
int b;
r = sd_bus_message_read(message, "b", &b);
if (r < 0)
return r;
if (mode != UNIT_CHECK) {
c->blockio_accounting = b;
u->cgroup_realized_mask &= ~CGROUP_BLKIO;
unit_write_drop_in_private(u, mode, name, b ? "BlockIOAccounting=yes" : "BlockIOAccounting=no");
}
return 1;
} else if (streq(name, "BlockIOWeight")) {
uint64_t u64;
unsigned long ul;
r = sd_bus_message_read(message, "t", &u64);
if (r < 0)
return r;
if (u64 == (uint64_t) -1)
ul = (unsigned long) -1;
else {
ul = (unsigned long) u64;
if (ul < 10 || ul > 1000)
return sd_bus_error_set_errnof(error, EINVAL, "BlockIOWeight value out of range");
}
if (mode != UNIT_CHECK) {
c->blockio_weight = ul;
u->cgroup_realized_mask &= ~CGROUP_BLKIO;
unit_write_drop_in_private_format(u, mode, name, "BlockIOWeight=%lu", ul);
}
return 1;
} else if (streq(name, "StartupBlockIOWeight")) {
uint64_t u64;
unsigned long ul;
r = sd_bus_message_read(message, "t", &u64);
if (r < 0)
return r;
if (u64 == (uint64_t) -1)
ul = (unsigned long) -1;
else {
ul = (unsigned long) u64;
if (ul < 10 || ul > 1000)
return sd_bus_error_set_errnof(error, EINVAL, "StartupBlockIOWeight value out of range");
}
if (mode != UNIT_CHECK) {
c->startup_blockio_weight = ul;
u->cgroup_realized_mask &= ~CGROUP_BLKIO;
unit_write_drop_in_private_format(u, mode, name, "StartupBlockIOWeight=%lu", ul);
}
return 1;
} else if (streq(name, "BlockIOReadBandwidth") || streq(name, "BlockIOWriteBandwidth")) {
const char *path;
bool read = true;
unsigned n = 0;
uint64_t u64;
if (streq(name, "BlockIOWriteBandwidth"))
read = false;
r = sd_bus_message_enter_container(message, 'a', "(st)");
if (r < 0)
return r;
while ((r = sd_bus_message_read(message, "(st)", &path, &u64)) > 0) {
if (mode != UNIT_CHECK) {
CGroupBlockIODeviceBandwidth *a = NULL, *b;
LIST_FOREACH(device_bandwidths, b, c->blockio_device_bandwidths) {
if (path_equal(path, b->path) && read == b->read) {
a = b;
break;
}
}
if (!a) {
a = new0(CGroupBlockIODeviceBandwidth, 1);
if (!a)
return -ENOMEM;
a->read = read;
a->path = strdup(path);
if (!a->path) {
free(a);
return -ENOMEM;
}
LIST_PREPEND(device_bandwidths, c->blockio_device_bandwidths, a);
}
a->bandwidth = u64;
}
n++;
}
if (r < 0)
return r;
r = sd_bus_message_exit_container(message);
if (r < 0)
return r;
if (mode != UNIT_CHECK) {
CGroupBlockIODeviceBandwidth *a, *next;
_cleanup_free_ char *buf = NULL;
_cleanup_fclose_ FILE *f = NULL;
size_t size = 0;
if (n == 0) {
LIST_FOREACH_SAFE(device_bandwidths, a, next, c->blockio_device_bandwidths)
if (a->read == read)
cgroup_context_free_blockio_device_bandwidth(c, a);
}
u->cgroup_realized_mask &= ~CGROUP_BLKIO;
f = open_memstream(&buf, &size);
if (!f)
return -ENOMEM;
if (read) {
fputs("BlockIOReadBandwidth=\n", f);
LIST_FOREACH(device_bandwidths, a, c->blockio_device_bandwidths)
if (a->read)
fprintf(f, "BlockIOReadBandwidth=%s %" PRIu64 "\n", a->path, a->bandwidth);
} else {
fputs("BlockIOWriteBandwidth=\n", f);
LIST_FOREACH(device_bandwidths, a, c->blockio_device_bandwidths)
if (!a->read)
fprintf(f, "BlockIOWriteBandwidth=%s %" PRIu64 "\n", a->path, a->bandwidth);
}
fflush(f);
unit_write_drop_in_private(u, mode, name, buf);
}
return 1;
} else if (streq(name, "BlockIODeviceWeight")) {
const char *path;
uint64_t u64;
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, &u64)) > 0) {
unsigned long ul = u64;
if (ul < 10 || ul > 1000)
return sd_bus_error_set_errnof(error, EINVAL, "BlockIODeviceWeight out of range");
if (mode != UNIT_CHECK) {
CGroupBlockIODeviceWeight *a = NULL, *b;
LIST_FOREACH(device_weights, b, c->blockio_device_weights) {
if (path_equal(b->path, path)) {
a = b;
break;
}
}
if (!a) {
a = new0(CGroupBlockIODeviceWeight, 1);
if (!a)
return -ENOMEM;
a->path = strdup(path);
if (!a->path) {
free(a);
return -ENOMEM;
}
LIST_PREPEND(device_weights,c->blockio_device_weights, a);
}
a->weight = ul;
}
n++;
}
r = sd_bus_message_exit_container(message);
if (r < 0)
return r;
if (mode != UNIT_CHECK) {
_cleanup_free_ char *buf = NULL;
_cleanup_fclose_ FILE *f = NULL;
CGroupBlockIODeviceWeight *a;
size_t size = 0;
if (n == 0) {
while (c->blockio_device_weights)
cgroup_context_free_blockio_device_weight(c, c->blockio_device_weights);
}
u->cgroup_realized_mask &= ~CGROUP_BLKIO;
f = open_memstream(&buf, &size);
if (!f)
return -ENOMEM;
fputs("BlockIODeviceWeight=\n", f);
LIST_FOREACH(device_weights, a, c->blockio_device_weights)
fprintf(f, "BlockIODeviceWeight=%s %lu\n", a->path, a->weight);
fflush(f);
unit_write_drop_in_private(u, mode, name, buf);
}
return 1;
} else if (streq(name, "MemoryAccounting")) {
int b;
r = sd_bus_message_read(message, "b", &b);
if (r < 0)
return r;
if (mode != UNIT_CHECK) {
c->memory_accounting = b;
u->cgroup_realized_mask &= ~CGROUP_MEMORY;
unit_write_drop_in_private(u, mode, name, b ? "MemoryAccounting=yes" : "MemoryAccounting=no");
}
return 1;
} else if (streq(name, "MemoryLimit")) {
uint64_t limit;
r = sd_bus_message_read(message, "t", &limit);
if (r < 0)
return r;
if (mode != UNIT_CHECK) {
c->memory_limit = limit;
u->cgroup_realized_mask &= ~CGROUP_MEMORY;
unit_write_drop_in_private_format(u, mode, name, "%s=%" PRIu64, name, limit);
}
return 1;
} else if (streq(name, "DevicePolicy")) {
const char *policy;
CGroupDevicePolicy p;
r = sd_bus_message_read(message, "s", &policy);
if (r < 0)
return r;
p = cgroup_device_policy_from_string(policy);
if (p < 0)
return -EINVAL;
if (mode != UNIT_CHECK) {
char *buf;
c->device_policy = p;
u->cgroup_realized_mask &= ~CGROUP_DEVICE;
buf = strappenda("DevicePolicy=", policy);
unit_write_drop_in_private(u, mode, name, buf);
}
return 1;
} else if (streq(name, "DeviceAllow")) {
const char *path, *rwm;
unsigned n = 0;
r = sd_bus_message_enter_container(message, 'a', "(ss)");
if (r < 0)
return r;
while ((r = sd_bus_message_read(message, "(ss)", &path, &rwm)) > 0) {
if ((!startswith(path, "/dev/") &&
!startswith(path, "block-") &&
!startswith(path, "char-")) ||
strpbrk(path, WHITESPACE))
return sd_bus_error_set_errnof(error, EINVAL, "DeviceAllow= requires device node");
if (isempty(rwm))
rwm = "rwm";
if (!in_charset(rwm, "rwm"))
return sd_bus_error_set_errnof(error, EINVAL, "DeviceAllow= requires combination of rwm flags");
if (mode != UNIT_CHECK) {
CGroupDeviceAllow *a = NULL, *b;
LIST_FOREACH(device_allow, b, c->device_allow) {
if (path_equal(b->path, path)) {
a = b;
break;
}
}
if (!a) {
a = new0(CGroupDeviceAllow, 1);
if (!a)
return -ENOMEM;
a->path = strdup(path);
if (!a->path) {
free(a);
return -ENOMEM;
}
LIST_PREPEND(device_allow, c->device_allow, a);
}
a->r = !!strchr(rwm, 'r');
a->w = !!strchr(rwm, 'w');
a->m = !!strchr(rwm, 'm');
}
n++;
}
if (r < 0)
return r;
r = sd_bus_message_exit_container(message);
if (r < 0)
return r;
if (mode != UNIT_CHECK) {
_cleanup_free_ char *buf = NULL;
_cleanup_fclose_ FILE *f = NULL;
CGroupDeviceAllow *a;
size_t size = 0;
if (n == 0) {
while (c->device_allow)
cgroup_context_free_device_allow(c, c->device_allow);
}
u->cgroup_realized_mask &= ~CGROUP_DEVICE;
f = open_memstream(&buf, &size);
if (!f)
return -ENOMEM;
fputs("DeviceAllow=\n", f);
LIST_FOREACH(device_allow, a, c->device_allow)
fprintf(f, "DeviceAllow=%s %s%s%s\n", a->path, a->r ? "r" : "", a->w ? "w" : "", a->m ? "m" : "");
fflush(f);
unit_write_drop_in_private(u, mode, name, buf);
}
return 1;
}
return 0;
}