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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 "util.h"
#include "strv.h"
#include "path-util.h"
#include "cgroup-util.h"
#include "cgroup-semantics.h"
static int parse_cpu_shares(const CGroupSemantics *s, const char *value, char **ret) {
unsigned long ul;
assert(s);
assert(value);
assert(ret);
if (safe_atolu(value, &ul) < 0 || ul < 1)
return -EINVAL;
if (asprintf(ret, "%lu", ul) < 0)
return -ENOMEM;
return 1;
}
static int parse_memory_limit(const CGroupSemantics *s, const char *value, char **ret) {
off_t sz;
assert(s);
assert(value);
assert(ret);
if (parse_bytes(value, &sz) < 0 || sz <= 0)
return -EINVAL;
if (asprintf(ret, "%llu", (unsigned long long) sz) < 0)
return -ENOMEM;
return 1;
}
static int parse_device(const CGroupSemantics *s, const char *value, char **ret) {
_cleanup_strv_free_ char **l = NULL;
char *x;
unsigned k;
assert(s);
assert(value);
assert(ret);
l = strv_split_quoted(value);
if (!l)
return -ENOMEM;
k = strv_length(l);
if (k < 1 || k > 2)
return -EINVAL;
if (!streq(l[0], "*") && !path_startswith(l[0], "/dev"))
return -EINVAL;
if (!isempty(l[1]) && !in_charset(l[1], "rwm"))
return -EINVAL;
x = strdup(value);
if (!x)
return -ENOMEM;
*ret = x;
return 1;
}
static int parse_blkio_weight(const CGroupSemantics *s, const char *value, char **ret) {
_cleanup_strv_free_ char **l = NULL;
unsigned long ul;
assert(s);
assert(value);
assert(ret);
l = strv_split_quoted(value);
if (!l)
return -ENOMEM;
if (strv_length(l) != 1)
return 0; /* Returning 0 will cause parse_blkio_weight_device() be tried instead */
if (safe_atolu(l[0], &ul) < 0 || ul < 10 || ul > 1000)
return -EINVAL;
if (asprintf(ret, "%lu", ul) < 0)
return -ENOMEM;
return 1;
}
static int parse_blkio_weight_device(const CGroupSemantics *s, const char *value, char **ret) {
_cleanup_strv_free_ char **l = NULL;
unsigned long ul;
assert(s);
assert(value);
assert(ret);
l = strv_split_quoted(value);
if (!l)
return -ENOMEM;
if (strv_length(l) != 2)
return -EINVAL;
if (!path_startswith(l[0], "/dev"))
return -EINVAL;
if (safe_atolu(l[1], &ul) < 0 || ul < 10 || ul > 1000)
return -EINVAL;
if (asprintf(ret, "%s %lu", l[0], ul) < 0)
return -ENOMEM;
return 1;
}
static int parse_blkio_bandwidth(const CGroupSemantics *s, const char *value, char **ret) {
_cleanup_strv_free_ char **l = NULL;
off_t bytes;
assert(s);
assert(value);
assert(ret);
l = strv_split_quoted(value);
if (!l)
return -ENOMEM;
if (strv_length(l) != 2)
return -EINVAL;
if (!path_startswith(l[0], "/dev")) {
return -EINVAL;
}
if (parse_bytes(l[1], &bytes) < 0 || bytes <= 0)
return -EINVAL;
if (asprintf(ret, "%s %llu", l[0], (unsigned long long) bytes) < 0)
return -ENOMEM;
return 0;
}
static int map_device(const CGroupSemantics *s, const char *value, char **ret) {
_cleanup_strv_free_ char **l = NULL;
unsigned k;
assert(s);
assert(value);
assert(ret);
l = strv_split_quoted(value);
if (!l)
return -ENOMEM;
k = strv_length(l);
if (k < 1 || k > 2)
return -EINVAL;
if (streq(l[0], "*")) {
if (asprintf(ret, "a *:*%s%s",
isempty(l[1]) ? "" : " ", strempty(l[1])) < 0)
return -ENOMEM;
} else {
struct stat st;
if (stat(l[0], &st) < 0) {
log_warning("Couldn't stat device %s", l[0]);
return -errno;
}
if (!S_ISCHR(st.st_mode) && !S_ISBLK(st.st_mode)) {
log_warning("%s is not a device.", l[0]);
return -ENODEV;
}
if (asprintf(ret, "%c %u:%u%s%s",
S_ISCHR(st.st_mode) ? 'c' : 'b',
major(st.st_rdev), minor(st.st_rdev),
isempty(l[1]) ? "" : " ", strempty(l[1])) < 0)
return -ENOMEM;
}
return 0;
}
static int map_blkio(const CGroupSemantics *s, const char *value, char **ret) {
_cleanup_strv_free_ char **l = NULL;
struct stat st;
dev_t d;
assert(s);
assert(value);
assert(ret);
l = strv_split_quoted(value);
if (!l)
return log_oom();
if (strv_length(l) != 2)
return -EINVAL;
if (stat(l[0], &st) < 0) {
log_warning("Couldn't stat device %s", l[0]);
return -errno;
}
if (S_ISBLK(st.st_mode))
d = st.st_rdev;
else if (major(st.st_dev) != 0) {
/* If this is not a device node then find the block
* device this file is stored on */
d = st.st_dev;
/* If this is a partition, try to get the originating
* block device */
block_get_whole_disk(d, &d);
} else {
log_warning("%s is not a block device and file system block device cannot be determined or is not local.", l[0]);
return -ENODEV;
}
if (asprintf(ret, "%u:%u %s", major(d), minor(d), l[1]) < 0)
return -ENOMEM;
return 0;
}
static const CGroupSemantics semantics[] = {
{ "cpu", "cpu.shares", "CPUShare", false, parse_cpu_shares, NULL, NULL },
{ "memory", "memory.soft_limit_in_bytes", "MemorySoftLimit", false, parse_memory_limit, NULL, NULL },
{ "memory", "memory.limit_in_bytes", "MemoryLimit", false, parse_memory_limit, NULL, NULL },
{ "devices", "devices.allow", "DeviceAllow", true, parse_device, map_device, NULL },
{ "devices", "devices.deny", "DeviceDeny", true, parse_device, map_device, NULL },
{ "blkio", "blkio.weight", "BlockIOWeight", false, parse_blkio_weight, NULL, NULL },
{ "blkio", "blkio.weight_device", "BlockIOWeight", true, parse_blkio_weight_device, map_blkio, NULL },
{ "blkio", "blkio.read_bps_device", "BlockIOReadBandwidth", true, parse_blkio_bandwidth, map_blkio, NULL },
{ "blkio", "blkio.write_bps_device", "BlockIOWriteBandwidth", true, parse_blkio_bandwidth, map_blkio, NULL }
};
int cgroup_semantics_find(
const char *controller,
const char *name,
const char *value,
char **ret,
const CGroupSemantics **_s) {
_cleanup_free_ char *c = NULL;
unsigned i;
int r;
assert(name);
assert(_s);
assert(!value == !ret);
if (!controller) {
r = cg_controller_from_attr(name, &c);
if (r < 0)
return r;
controller = c;
}
for (i = 0; i < ELEMENTSOF(semantics); i++) {
const CGroupSemantics *s = semantics + i;
bool matches_name, matches_pretty;
if (controller && s->controller && !streq(s->controller, controller))
continue;
matches_name = s->name && streq(s->name, name);
matches_pretty = s->pretty && streq(s->pretty, name);
if (!matches_name && !matches_pretty)
continue;
if (value) {
if (matches_pretty && s->map_pretty) {
r = s->map_pretty(s, value, ret);
if (r < 0)
return r;
if (r == 0)
continue;
} else {
char *x;
x = strdup(value);
if (!x)
return -ENOMEM;
*ret = x;
}
}
*_s = s;
return 1;
}
*ret = NULL;
*_s = NULL;
return 0;
}
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