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cgroup: mount cgroup file systems to /sys/fs/cgroup instead of /cgroup

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This requires the /sys/fs/cgroup to exist. Current git kernels have
this, released kernels need a backport of a single patch.
This commit is contained in:
Lennart Poettering 2010-08-25 04:58:16 +02:00
parent ee2083d5ca
commit 77d5f105bf
9 changed files with 20 additions and 22 deletions
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2
Makefile.am
View File

@ -847,8 +847,6 @@ install-data-hook:
$(DESTDIR)$(pkgsysconfdir)/system/graphical.target.wants \
$(DESTDIR)$(pkgsysconfdir)/session \
$(DESTDIR)$(sysconfdir)/xdg/systemd
$(MKDIR_P) -m 0755 $(DESTDIR)/cgroup || \
echo "Don't forget to create /cgroup! Couldn't create it for you, continuing anyway."
( cd $(DESTDIR)$(sysconfdir)/xdg/systemd/ && \
rm -f session && \
$(LN_S) $(pkgsysconfdir)/session session )

6
man/sd_booted.xml
View File

@ -85,11 +85,11 @@
implementation.</para>
<para>Internally, this function checks whether the
<filename>/cgroup/systemd</filename> virtual file
<filename>/sys/fs/cgroup/systemd</filename> virtual file
system is mounted, by comparing the st_dev value of
the <function>stat()</function> data of
<filename>/cgroup</filename> and
<filename>/cgroup/systemd</filename>.</para>
<filename>/sys/fs/cgroup</filename> and
<filename>/sys/fs/cgroup/systemd</filename>.</para>
<para>For details about the algorithm check the
liberally licensed reference implementation sources:

2
man/systemd-cgls.xml
View File

@ -65,7 +65,7 @@
file paths or are assumed in the systemd control group
hierarchy. If no argument is specified and the current
working directory is beneath the control group mount
point <filename>/cgroup</filename> shows the contents
point <filename>/sys/fs/cgroup</filename> shows the contents
of the control group the working directory refers
to. Otherwise the full systemd control group hierarchy
is shown.</para>

2
man/systemd.xml
View File

@ -388,7 +388,7 @@
track of processes. Control group information is
maintained in the kernel, and is accessible via the
file system hierarchy (beneath
<filename>/cgroup/systemd/</filename>), or in tools
<filename>/sys/fs/cgroup/systemd/</filename>), or in tools
such as
<citerefentry><refentrytitle>ps</refentrytitle><manvolnum>1</manvolnum></citerefentry>
(<command>ps xawf -eo pid,user,cgroup,args</command>

2
src/cgls.c
View File

@ -103,7 +103,7 @@ int main(int argc, char *argv[]) {
goto finish;
}
if (path_startswith(p, "/cgroup")) {
if (path_startswith(p, "/sys/fs/cgroup")) {
printf("Working Directory %s:\n", p);
r = show_cgroup_by_path(p, NULL, 0);
} else

4
src/cgroup-util.c
View File

@ -481,7 +481,7 @@ int cg_get_path(const char *controller, const char *path, const char *suffix, ch
else
p = controller;
if (asprintf(&mp, "/cgroup/%s", p) < 0)
if (asprintf(&mp, "/sys/fs/cgroup/%s", p) < 0)
return -ENOMEM;
if ((r = path_is_mount_point(mp)) <= 0) {
@ -927,7 +927,7 @@ int cg_fix_path(const char *path, char **result) {
/* First check if it already is a filesystem path */
if (path_is_absolute(path) &&
path_startswith(path, "/cgroup") &&
path_startswith(path, "/sys/fs/cgroup") &&
access(path, F_OK) >= 0) {
if (!(t = strdup(path)))

18
src/mount-setup.c
View File

@ -42,13 +42,13 @@ typedef struct MountPoint {
} MountPoint;
static const MountPoint mount_table[] = {
{ "proc", "/proc", "proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
{ "sysfs", "/sys", "sysfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
{ "devtmpfs", "/dev", "devtmpfs", "mode=755", MS_NOSUID, true },
{ "tmpfs", "/dev/shm", "tmpfs", "mode=1777", MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
{ "devpts", "/dev/pts", "devpts", NULL, MS_NOSUID|MS_NOEXEC, false },
{ "tmpfs", "/cgroup", "tmpfs", "mode=755", MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
{ "cgroup", "/cgroup/systemd", "cgroup", "none,name=systemd", MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
{ "proc", "/proc", "proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
{ "sysfs", "/sys", "sysfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
{ "devtmpfs", "/dev", "devtmpfs", "mode=755", MS_NOSUID, true },
{ "tmpfs", "/dev/shm", "tmpfs", "mode=1777", MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
{ "devpts", "/dev/pts", "devpts", NULL, MS_NOSUID|MS_NOEXEC, false },
{ "tmpfs", "/sys/fs/cgroup", "tmpfs", "mode=755", MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
{ "cgroup", "/sys/fs/cgroup/systemd", "cgroup", "none,name=systemd", MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
};
/* These are API file systems that might be mounted by other software,
@ -75,7 +75,7 @@ bool mount_point_is_api(const char *path) {
if (path_equal(path, ignore_paths[i]))
return true;
return path_startswith(path, "/cgroup/");
return path_startswith(path, "/sys/fs/cgroup/");
}
static int mount_one(const MountPoint *p) {
@ -138,7 +138,7 @@ static int mount_cgroup_controllers(void) {
goto finish;
}
if (asprintf(&where, "/cgroup/%s", controller) < 0) {
if (asprintf(&where, "/sys/fs/cgroup/%s", controller) < 0) {
free(controller);
r = -ENOMEM;
goto finish;

4
src/sd-daemon.c
View File

@ -441,10 +441,10 @@ int sd_booted(void) {
/* We simply test whether the systemd cgroup hierarchy is
* mounted */
if (lstat("/cgroup", &a) < 0)
if (lstat("/sys/fs/cgroup", &a) < 0)
return 0;
if (lstat("/cgroup/systemd", &b) < 0)
if (lstat("/sys/fs/cgroup/systemd", &b) < 0)
return 0;
return a.st_dev != b.st_dev;

2
src/test-cgroup.c
View File

@ -53,7 +53,7 @@ int main(int argc, char*argv[]) {
free(path);
assert_se(cg_get_path(SYSTEMD_CGROUP_CONTROLLER, "/test-b/test-d", NULL, &path) == 0);
assert_se(path_equal(path, "/cgroup/systemd/test-b/test-d"));
assert_se(path_equal(path, "/sys/fs/cgroup/systemd/test-b/test-d"));
free(path);
assert_se(cg_is_empty(SYSTEMD_CGROUP_CONTROLLER, "/test-a", false) > 0);