cgroup2: use new fstype for unified hierarchy

[elogind.git] / src / basic / cgroup-util.c

diff --git a/src/basic/cgroup-util.c b/src/basic/cgroup-util.c
index 5dc631eee410a97a8fa6e277f20a781a5dabd414..3506ca8bffaf0c1b1085c3121c2b10d76e4deffb 100644 (file)
--- a/src/basic/cgroup-util.c
+++ b/src/basic/cgroup-util.c
@@ -1,5 +1,3 @@
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
 /***
   This file is part of systemd.
 
@@ -19,28 +17,45 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
+#include <dirent.h>
 #include <errno.h>
-#include <unistd.h>
+#include <ftw.h>
+//#include <limits.h>
 #include <signal.h>
-#include <string.h>
+//#include <stddef.h>
 #include <stdlib.h>
-#include <dirent.h>
+#include <string.h>
 #include <sys/stat.h>
+//#include <sys/statfs.h>
 #include <sys/types.h>
-#include <ftw.h>
+#include <unistd.h>
 
-#include "set.h"
-#include "macro.h"
-#include "util.h"
-#include "formats-util.h"
-#include "process-util.h"
-#include "path-util.h"
-// #include "unit-name.h"
+#include "alloc-util.h"
+#include "cgroup-util.h"
+//#include "def.h"
+#include "dirent-util.h"
+#include "extract-word.h"
+#include "fd-util.h"
 #include "fileio.h"
-// #include "special.h"
-#include "mkdir.h"
+#include "formats-util.h"
+#include "fs-util.h"
+//#include "log.h"
 #include "login-util.h"
-#include "cgroup-util.h"
+#include "macro.h"
+//#include "missing.h"
+#include "mkdir.h"
+#include "parse-util.h"
+#include "path-util.h"
+#include "proc-cmdline.h"
+#include "process-util.h"
+#include "set.h"
+//#include "special.h"
+#include "stat-util.h"
+#include "stdio-util.h"
+#include "string-table.h"
+#include "string-util.h"
+#include "unit-name.h"
+#include "user-util.h"
 
 int cg_enumerate_processes(const char *controller, const char *path, FILE **_f) {
         _cleanup_free_ char *fs = NULL;
@@ -76,7 +91,7 @@ int cg_read_pid(FILE *f, pid_t *_pid) {
                 if (feof(f))
                         return 0;
 
-                return errno ? -errno : -EIO;
+                return errno > 0 ? -errno : -EIO;
         }
 
         if (ul <= 0)
@@ -461,7 +476,7 @@ static const char *controller_to_dirname(const char *controller) {
         if (e)
                 return e;
 
-                return controller;
+        return controller;
 }
 
 static int join_path_legacy(const char *controller, const char *path, const char *suffix, char **fs) {
@@ -520,7 +535,7 @@ int cg_get_path(const char *controller, const char *path, const char *suffix, ch
                  * *below* the controllers, without any prefix. */
 
                 if (!path && !suffix)
-                return -EINVAL;
+                        return -EINVAL;
 
                 if (!suffix)
                         t = strdup(path);
@@ -546,12 +561,12 @@ int cg_get_path(const char *controller, const char *path, const char *suffix, ch
                 r = join_path_unified(path, suffix, fs);
         else
                 r = join_path_legacy(controller, path, suffix, fs);
-                if (r < 0)
-                        return r;
+        if (r < 0)
+                return r;
 
         path_kill_slashes(*fs);
         return 0;
-        }
+}
 
 static int controller_is_accessible(const char *controller) {
         int unified;
@@ -573,7 +588,7 @@ static int controller_is_accessible(const char *controller) {
                 /* We don't support named hierarchies if we are using
                  * the unified hierarchy. */
 
-                if (streq(controller, ELOGIND_CGROUP_CONTROLLER))
+                if (streq(controller, SYSTEMD_CGROUP_CONTROLLER))
                         return 0;
 
                 if (startswith(controller, "name="))
@@ -635,7 +650,7 @@ int cg_trim(const char *controller, const char *path, bool delete_root) {
         if (nftw(fs, trim_cb, 64, FTW_DEPTH|FTW_MOUNT|FTW_PHYS) != 0) {
                 if (errno == ENOENT)
                         r = 0;
-                else if (errno != 0)
+                else if (errno > 0)
                         r = -errno;
                 else
                         r = -EIO;
@@ -704,9 +719,9 @@ int cg_attach(const char *controller, const char *path, pid_t pid) {
         if (pid == 0)
                 pid = getpid();
 
-        snprintf(c, sizeof(c), PID_FMT"\n", pid);
+        xsprintf(c, PID_FMT "\n", pid);
 
-        return write_string_file_no_create(fs, c);
+        return write_string_file(fs, c, 0);
 }
 
 int cg_attach_fallback(const char *controller, const char *path, pid_t pid) {
@@ -735,8 +750,7 @@ int cg_attach_fallback(const char *controller, const char *path, pid_t pid) {
         return r;
 }
 
-/// UNNEEDED by elogind
-#if 0
+#if 0 /// UNNEEDED by elogind
 int cg_set_group_access(
                 const char *controller,
                 const char *path,
@@ -819,12 +833,14 @@ int cg_pid_get_path(const char *controller, pid_t pid, char **path) {
                         if (!cg_controller_is_valid(controller))
                                 return -EINVAL;
                 } else
-                        controller = ELOGIND_CGROUP_CONTROLLER;
+                        controller = SYSTEMD_CGROUP_CONTROLLER;
 
                 cs = strlen(controller);
         }
 
         fs = procfs_file_alloca(pid, "cgroup");
+        log_debug_elogind("Searching for PID %u in \"%s\" (controller \"%s\")",
+                          pid, fs, controller);
         f = fopen(fs, "re");
         if (!f)
                 return errno == ENOENT ? -ESRCH : -errno;
@@ -869,6 +885,7 @@ int cg_pid_get_path(const char *controller, pid_t pid, char **path) {
                                 continue;
                 }
 
+                log_debug_elogind("Found %s:%s", line, e+1);
                 p = strdup(e + 1);
                 if (!p)
                         return -ENOMEM;
@@ -903,7 +920,7 @@ int cg_install_release_agent(const char *controller, const char *agent) {
 
         sc = strstrip(contents);
         if (isempty(sc)) {
-                r = write_string_file_no_create(fs, agent);
+                r = write_string_file(fs, agent, 0);
                 if (r < 0)
                         return r;
         } else if (!path_equal(sc, agent))
@@ -921,7 +938,7 @@ int cg_install_release_agent(const char *controller, const char *agent) {
 
         sc = strstrip(contents);
         if (streq(sc, "0")) {
-                r = write_string_file_no_create(fs, "1");
+                r = write_string_file(fs, "1", 0);
                 if (r < 0)
                         return r;
 
@@ -948,7 +965,7 @@ int cg_uninstall_release_agent(const char *controller) {
         if (r < 0)
                 return r;
 
-        r = write_string_file_no_create(fs, "0");
+        r = write_string_file(fs, "0", 0);
         if (r < 0)
                 return r;
 
@@ -958,7 +975,7 @@ int cg_uninstall_release_agent(const char *controller) {
         if (r < 0)
                 return r;
 
-        r = write_string_file_no_create(fs, "");
+        r = write_string_file(fs, "", 0);
         if (r < 0)
                 return r;
 
@@ -1005,8 +1022,8 @@ int cg_is_empty_recursive(const char *controller, const char *path) {
                  * via the "cgroup.populated" attribute. */
 
                 r = cg_get_path(controller, path, "cgroup.populated", &populated);
-        if (r < 0)
-                return r;
+                if (r < 0)
+                        return r;
 
                 r = read_one_line_file(populated, &t);
                 if (r == -ENOENT)
@@ -1016,33 +1033,33 @@ int cg_is_empty_recursive(const char *controller, const char *path) {
 
                 return streq(t, "0");
         } else {
-        _cleanup_closedir_ DIR *d = NULL;
-        char *fn;
+                _cleanup_closedir_ DIR *d = NULL;
+                char *fn;
 
                 r = cg_is_empty(controller, path);
-        if (r <= 0)
-                return r;
+                if (r <= 0)
+                        return r;
 
-        r = cg_enumerate_subgroups(controller, path, &d);
-                if (r == -ENOENT)
-                        return 1;
-        if (r < 0)
+                r = cg_enumerate_subgroups(controller, path, &d);
+                        if (r == -ENOENT)
+                                return 1;
+                if (r < 0)
                         return r;
 
-        while ((r = cg_read_subgroup(d, &fn)) > 0) {
-                _cleanup_free_ char *p = NULL;
+                while ((r = cg_read_subgroup(d, &fn)) > 0) {
+                        _cleanup_free_ char *p = NULL;
 
-                p = strjoin(path, "/", fn, NULL);
-                free(fn);
-                if (!p)
-                        return -ENOMEM;
+                        p = strjoin(path, "/", fn, NULL);
+                        free(fn);
+                        if (!p)
+                                return -ENOMEM;
 
                         r = cg_is_empty_recursive(controller, p);
-                if (r <= 0)
+                        if (r <= 0)
+                                return r;
+                }
+                if (r < 0)
                         return r;
-        }
-        if (r < 0)
-                return r;
 
                 return true;
         }
@@ -1155,18 +1172,17 @@ int cg_mangle_path(const char *path, char **result) {
         if (r < 0)
                 return r;
 
-        return cg_get_path(c ? c : ELOGIND_CGROUP_CONTROLLER, p ? p : "/", NULL, result);
+        return cg_get_path(c ?: SYSTEMD_CGROUP_CONTROLLER, p ?: "/", NULL, result);
 }
 
 int cg_get_root_path(char **path) {
-/// elogind does not support systemd scopes and slices
-#if 0
+#if 0 /// elogind does not support systemd scopes and slices
         char *p, *e;
         int r;
 
         assert(path);
 
-        r = cg_pid_get_path(ELOGIND_CGROUP_CONTROLLER, 1, &p);
+        r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 1, &p);
         if (r < 0)
                 return r;
 
@@ -1182,7 +1198,7 @@ int cg_get_root_path(char **path) {
         return 0;
 #else
         assert(path);
-        return cg_pid_get_path(ELOGIND_CGROUP_CONTROLLER, 1, path);
+        return cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 1, path);
 #endif // 0
 }
 
@@ -1223,7 +1239,7 @@ int cg_pid_get_path_shifted(pid_t pid, const char *root, char **cgroup) {
         assert(pid >= 0);
         assert(cgroup);
 
-        r = cg_pid_get_path(ELOGIND_CGROUP_CONTROLLER, pid, &raw);
+        r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &raw);
         if (r < 0)
                 return r;
 
@@ -1250,8 +1266,7 @@ int cg_pid_get_path_shifted(pid_t pid, const char *root, char **cgroup) {
         return 0;
 }
 
-/// UNNEEDED by elogind
-#if 0
+#if 0 /// UNNEEDED by elogind
 int cg_path_decode_unit(const char *cgroup, char **unit){
         char *c, *s;
         size_t n;
@@ -1570,8 +1585,7 @@ int cg_pid_get_session(pid_t pid, char **session) {
         return cg_path_get_session(cgroup, session);
 }
 
-/// UNNEEDED by elogind
-#if 0
+#if 0 /// UNNEEDED by elogind
 int cg_path_get_owner_uid(const char *path, uid_t *uid) {
         _cleanup_free_ char *slice = NULL;
         char *start, *end;
@@ -1725,7 +1739,7 @@ char *cg_escape(const char *p) {
                                 if (memcmp(p, n, l) != 0)
                                         continue;
 
-                                        need_prefix = true;
+                                need_prefix = true;
                                 break;
                         }
                 }
@@ -1734,7 +1748,7 @@ char *cg_escape(const char *p) {
         if (need_prefix)
                 return strappend("_", p);
 
-                return strdup(p);
+        return strdup(p);
 }
 
 char *cg_unescape(const char *p) {
@@ -1776,8 +1790,7 @@ bool cg_controller_is_valid(const char *p) {
         return true;
 }
 
-/// UNNEEDED by elogind
-#if 0
+#if 0 /// UNNEEDED by elogind
 int cg_slice_to_path(const char *unit, char **ret) {
         _cleanup_free_ char *p = NULL, *s = NULL, *e = NULL;
         const char *dash;
@@ -1856,11 +1869,10 @@ int cg_set_attribute(const char *controller, const char *path, const char *attri
         if (r < 0)
                 return r;
 
-        return write_string_file_no_create(p, value);
+        return write_string_file(p, value, 0);
 }
 
-/// UNNEEDED by elogind
-#if 0
+#if 0 /// UNNEEDED by elogind
 int cg_get_attribute(const char *controller, const char *path, const char *attribute, char **ret) {
         _cleanup_free_ char *p = NULL;
         int r;
@@ -1881,7 +1893,7 @@ int cg_create_everywhere(CGroupMask supported, CGroupMask mask, const char *path
          * in all others */
 
         /* First create the cgroup in our own hierarchy. */
-        r = cg_create(ELOGIND_CGROUP_CONTROLLER, path);
+        r = cg_create(SYSTEMD_CGROUP_CONTROLLER, path);
         if (r < 0)
                 return r;
 
@@ -1912,7 +1924,7 @@ int cg_attach_everywhere(CGroupMask supported, const char *path, pid_t pid, cg_m
         CGroupController c;
         int r, unified;
 
-        r = cg_attach(ELOGIND_CGROUP_CONTROLLER, path, pid);
+        r = cg_attach(SYSTEMD_CGROUP_CONTROLLER, path, pid);
         if (r < 0)
                 return r;
 
@@ -1963,7 +1975,7 @@ int cg_migrate_everywhere(CGroupMask supported, const char *from, const char *to
         int r = 0, unified;
 
         if (!path_equal(from, to))  {
-                r = cg_migrate_recursive(ELOGIND_CGROUP_CONTROLLER, from, ELOGIND_CGROUP_CONTROLLER, to, false, true);
+                r = cg_migrate_recursive(SYSTEMD_CGROUP_CONTROLLER, from, SYSTEMD_CGROUP_CONTROLLER, to, false, true);
                 if (r < 0)
                         return r;
         }
@@ -1987,7 +1999,7 @@ int cg_migrate_everywhere(CGroupMask supported, const char *from, const char *to
                         if (!p)
                                 p = to;
 
-                (void) cg_migrate_recursive_fallback(ELOGIND_CGROUP_CONTROLLER, to, cgroup_controller_to_string(c), p, false, false);
+                (void) cg_migrate_recursive_fallback(SYSTEMD_CGROUP_CONTROLLER, to, cgroup_controller_to_string(c), p, false, false);
         }
 
         return 0;
@@ -1997,7 +2009,7 @@ int cg_trim_everywhere(CGroupMask supported, const char *path, bool delete_root)
         CGroupController c;
         int r, unified;
 
-        r = cg_trim(ELOGIND_CGROUP_CONTROLLER, path, delete_root);
+        r = cg_trim(SYSTEMD_CGROUP_CONTROLLER, path, delete_root);
         if (r < 0)
                 return r;
 
@@ -2043,7 +2055,7 @@ int cg_mask_supported(CGroupMask *ret) {
                 if (r < 0)
                         return r;
 
-                r = cg_get_path(ELOGIND_CGROUP_CONTROLLER, root, "cgroup.controllers", &path);
+                r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, root, "cgroup.controllers", &path);
                 if (r < 0)
                         return r;
 
@@ -2069,9 +2081,10 @@ int cg_mask_supported(CGroupMask *ret) {
                         mask |= CGROUP_CONTROLLER_TO_MASK(v);
         }
 
-                /* Currently, we only support the memory controller in
-                 * the unified hierarchy, mask everything else off. */
-                mask &= CGROUP_MASK_MEMORY;
+                /* Currently, we only support the memory and pids
+                 * controller in the unified hierarchy, mask
+                 * everything else off. */
+                mask &= CGROUP_MASK_MEMORY | CGROUP_MASK_PIDS;
 
         } else {
                 CGroupController c;
@@ -2092,8 +2105,7 @@ int cg_mask_supported(CGroupMask *ret) {
         return 0;
 }
 
-/// UNNEEDED by elogind
-#if 0
+#if 0 /// UNNEEDED by elogind
 int cg_kernel_controllers(Set *controllers) {
         _cleanup_fclose_ FILE *f = NULL;
         char buf[LINE_MAX];
@@ -2126,7 +2138,7 @@ int cg_kernel_controllers(Set *controllers) {
                         if (feof(f))
                                 break;
 
-                        if (ferror(f) && errno != 0)
+                        if (ferror(f) && errno > 0)
                                 return -errno;
 
                         return -EBADMSG;
@@ -2186,8 +2198,7 @@ int cg_unified(void) {
         return unified_cache;
 }
 
-/// UNNEEDED by elogind
-#if 0
+#if 0 /// UNNEEDED by elogind
 void cg_unified_flush(void) {
         unified_cache = -1;
 }
@@ -2208,7 +2219,7 @@ int cg_enable_everywhere(CGroupMask supported, CGroupMask mask, const char *p) {
         if (!unified) /* on the legacy hiearchy there's no joining of controllers defined */
                 return 0;
 
-        r = cg_get_path(ELOGIND_CGROUP_CONTROLLER, p, "cgroup.subtree_control", &fs);
+        r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, p, "cgroup.subtree_control", &fs);
         if (r < 0)
                 return r;
 
@@ -2270,6 +2281,52 @@ bool cg_is_unified_wanted(void) {
 bool cg_is_legacy_wanted(void) {
         return !cg_is_unified_wanted();
 }
+#else
+bool cg_is_legacy_wanted(void) {
+        return true;
+}
+#endif // 0
+
+#if 0 /// UNNEEDED by elogind
+int cg_cpu_shares_parse(const char *s, uint64_t *ret) {
+        uint64_t u;
+        int r;
+
+        if (isempty(s)) {
+                *ret = CGROUP_CPU_SHARES_INVALID;
+                return 0;
+        }
+
+        r = safe_atou64(s, &u);
+        if (r < 0)
+                return r;
+
+        if (u < CGROUP_CPU_SHARES_MIN || u > CGROUP_CPU_SHARES_MAX)
+                return -ERANGE;
+
+        *ret = u;
+        return 0;
+}
+
+int cg_blkio_weight_parse(const char *s, uint64_t *ret) {
+        uint64_t u;
+        int r;
+
+        if (isempty(s)) {
+                *ret = CGROUP_BLKIO_WEIGHT_INVALID;
+                return 0;
+        }
+
+        r = safe_atou64(s, &u);
+        if (r < 0)
+                return r;
+
+        if (u < CGROUP_BLKIO_WEIGHT_MIN || u > CGROUP_BLKIO_WEIGHT_MAX)
+                return -ERANGE;
+
+        *ret = u;
+        return 0;
+}
 #endif // 0
 
 static const char *cgroup_controller_table[_CGROUP_CONTROLLER_MAX] = {
@@ -2277,7 +2334,8 @@ static const char *cgroup_controller_table[_CGROUP_CONTROLLER_MAX] = {
         [CGROUP_CONTROLLER_CPUACCT] = "cpuacct",
         [CGROUP_CONTROLLER_BLKIO] = "blkio",
         [CGROUP_CONTROLLER_MEMORY] = "memory",
-        [CGROUP_CONTROLLER_DEVICE] = "devices",
+        [CGROUP_CONTROLLER_DEVICES] = "devices",
+        [CGROUP_CONTROLLER_PIDS] = "pids",
 };
 
 DEFINE_STRING_TABLE_LOOKUP(cgroup_controller, CGroupController);