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https://github.com/systemd/systemd
synced 2024-09-06 16:56:43 +00:00
login: limit nr_inodes for /run/user/$UID
Limit number of inodes for tmpfs mounts on /run/user/$UID. Default is RuntimeDirectorySize= divided by 4096.
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@ -304,6 +304,19 @@
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memory as is needed.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>RuntimeDirectoryInodesMax=</varname></term>
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<listitem><para>Sets the limit on number of inodes for the
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<varname>$XDG_RUNTIME_DIR</varname> runtime directory for each
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user who logs in. Takes a number, optionally suffixed with the
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usual K, G, M, and T suffixes, to the base 1024 (IEC).
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Defaults to <varname>RuntimeDirectorySize=</varname> divided
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by 4096. Note that this size is a safety limit only.
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As each runtime directory is a tmpfs file system, it will
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only consume as much memory as is needed.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>InhibitorsMax=</varname></term>
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@ -217,6 +217,8 @@ node /org/freedesktop/login1 {
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@org.freedesktop.DBus.Property.EmitsChangedSignal("const")
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readonly t RuntimeDirectorySize = ...;
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@org.freedesktop.DBus.Property.EmitsChangedSignal("const")
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readonly t RuntimeDirectoryInodesMax = ...;
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@org.freedesktop.DBus.Property.EmitsChangedSignal("const")
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readonly t InhibitorsMax = ...;
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@org.freedesktop.DBus.Property.EmitsChangedSignal("false")
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readonly t NCurrentInhibitors = ...;
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@ -425,6 +427,8 @@ node /org/freedesktop/login1 {
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<variablelist class="dbus-property" generated="True" extra-ref="RuntimeDirectorySize"/>
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<variablelist class="dbus-property" generated="True" extra-ref="RuntimeDirectoryInodesMax"/>
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<variablelist class="dbus-property" generated="True" extra-ref="InhibitorsMax"/>
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<variablelist class="dbus-property" generated="True" extra-ref="NCurrentInhibitors"/>
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@ -623,7 +627,8 @@ node /org/freedesktop/login1 {
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<varname>HandleLidSwitchExternalPower</varname>, <varname>HandleLidSwitchDocked</varname>,
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<varname>IdleActionUSec</varname>, <varname>HoldoffTimeoutUSec</varname>,
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<varname>RemoveIPC</varname>, <varname>RuntimeDirectorySize</varname>,
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<varname>InhibitorsMax</varname>, and <varname>SessionsMax</varname>.
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<varname>RuntimeDirectoryInodesMax</varname>, <varname>InhibitorsMax</varname>, and
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<varname>SessionsMax</varname>.
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</para>
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<para>The <varname>IdleHint</varname> property reflects the idle hint state of the system. If the
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@ -55,6 +55,7 @@ void manager_reset_config(Manager *m) {
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m->idle_action = HANDLE_IGNORE;
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m->runtime_dir_size = physical_memory_scale(10U, 100U); /* 10% */
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m->runtime_dir_inodes = DIV_ROUND_UP(m->runtime_dir_size, 4096); /* 4k per inode */
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m->sessions_max = 8192;
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m->inhibitors_max = 8192;
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@ -3359,6 +3359,7 @@ static const sd_bus_vtable manager_vtable[] = {
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SD_BUS_PROPERTY("OnExternalPower", "b", property_get_on_external_power, 0, 0),
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SD_BUS_PROPERTY("RemoveIPC", "b", bus_property_get_bool, offsetof(Manager, remove_ipc), SD_BUS_VTABLE_PROPERTY_CONST),
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SD_BUS_PROPERTY("RuntimeDirectorySize", "t", NULL, offsetof(Manager, runtime_dir_size), SD_BUS_VTABLE_PROPERTY_CONST),
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SD_BUS_PROPERTY("RuntimeDirectoryInodesMax", "t", NULL, offsetof(Manager, runtime_dir_inodes), SD_BUS_VTABLE_PROPERTY_CONST),
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SD_BUS_PROPERTY("InhibitorsMax", "t", NULL, offsetof(Manager, inhibitors_max), SD_BUS_VTABLE_PROPERTY_CONST),
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SD_BUS_PROPERTY("NCurrentInhibitors", "t", property_get_hashmap_size, offsetof(Manager, inhibitors), 0),
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SD_BUS_PROPERTY("SessionsMax", "t", NULL, offsetof(Manager, sessions_max), SD_BUS_VTABLE_PROPERTY_CONST),
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@ -38,6 +38,7 @@ Login.HoldoffTimeoutSec, config_parse_sec, 0, offse
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Login.IdleAction, config_parse_handle_action, 0, offsetof(Manager, idle_action)
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Login.IdleActionSec, config_parse_sec, 0, offsetof(Manager, idle_action_usec)
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Login.RuntimeDirectorySize, config_parse_tmpfs_size, 0, offsetof(Manager, runtime_dir_size)
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Login.RuntimeDirectoryInodesMax, config_parse_uint64, 0, offsetof(Manager, runtime_dir_inodes)
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Login.RemoveIPC, config_parse_bool, 0, offsetof(Manager, remove_ipc)
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Login.InhibitorsMax, config_parse_uint64, 0, offsetof(Manager, inhibitors_max)
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Login.SessionsMax, config_parse_uint64, 0, offsetof(Manager, sessions_max)
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@ -32,6 +32,7 @@
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#IdleAction=ignore
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#IdleActionSec=30min
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#RuntimeDirectorySize=10%
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#RuntimeDirectoryInodes=400k
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#RemoveIPC=yes
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#InhibitorsMax=8192
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#SessionsMax=8192
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@ -120,6 +120,7 @@ struct Manager {
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sd_event_source *lid_switch_ignore_event_source;
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uint64_t runtime_dir_size;
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uint64_t runtime_dir_inodes;
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uint64_t sessions_max;
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uint64_t inhibitors_max;
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};
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@ -22,7 +22,7 @@
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#include "strv.h"
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#include "user-util.h"
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static int acquire_runtime_dir_size(uint64_t *ret) {
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static int acquire_runtime_dir_properties(uint64_t *size, uint64_t *inodes) {
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_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
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_cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
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int r;
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@ -31,10 +31,14 @@ static int acquire_runtime_dir_size(uint64_t *ret) {
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if (r < 0)
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return log_error_errno(r, "Failed to connect to system bus: %m");
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r = sd_bus_get_property_trivial(bus, "org.freedesktop.login1", "/org/freedesktop/login1", "org.freedesktop.login1.Manager", "RuntimeDirectorySize", &error, 't', ret);
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r = sd_bus_get_property_trivial(bus, "org.freedesktop.login1", "/org/freedesktop/login1", "org.freedesktop.login1.Manager", "RuntimeDirectorySize", &error, 't', size);
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if (r < 0)
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return log_error_errno(r, "Failed to acquire runtime directory size: %s", bus_error_message(&error, r));
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r = sd_bus_get_property_trivial(bus, "org.freedesktop.login1", "/org/freedesktop/login1", "org.freedesktop.login1.Manager", "RuntimeDirectoryInodesMax", &error, 't', inodes);
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if (r < 0)
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return log_error_errno(r, "Failed to acquire number of inodes for runtime directory: %s", bus_error_message(&error, r));
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return 0;
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}
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@ -42,7 +46,8 @@ static int user_mkdir_runtime_path(
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const char *runtime_path,
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uid_t uid,
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gid_t gid,
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uint64_t runtime_dir_size) {
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uint64_t runtime_dir_size,
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uint64_t runtime_dir_inodes) {
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int r;
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@ -58,14 +63,15 @@ static int user_mkdir_runtime_path(
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if (path_is_mount_point(runtime_path, NULL, 0) >= 0)
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log_debug("%s is already a mount point", runtime_path);
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else {
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char options[sizeof("mode=0700,uid=,gid=,size=,smackfsroot=*")
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char options[sizeof("mode=0700,uid=,gid=,size=,nr_inodes=,smackfsroot=*")
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+ DECIMAL_STR_MAX(uid_t)
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+ DECIMAL_STR_MAX(gid_t)
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+ DECIMAL_STR_MAX(uint64_t)
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+ DECIMAL_STR_MAX(uint64_t)];
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xsprintf(options,
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"mode=0700,uid=" UID_FMT ",gid=" GID_FMT ",size=%" PRIu64 "%s",
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uid, gid, runtime_dir_size,
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"mode=0700,uid=" UID_FMT ",gid=" GID_FMT ",size=%" PRIu64 ",nr_inodes=%" PRIu64 "%s",
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uid, gid, runtime_dir_size, runtime_dir_inodes,
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mac_smack_use() ? ",smackfsroot=*" : "");
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(void) mkdir_label(runtime_path, 0700);
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@ -127,7 +133,7 @@ static int user_remove_runtime_path(const char *runtime_path) {
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static int do_mount(const char *user) {
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char runtime_path[sizeof("/run/user") + DECIMAL_STR_MAX(uid_t)];
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uint64_t runtime_dir_size;
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uint64_t runtime_dir_size, runtime_dir_inodes;
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uid_t uid;
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gid_t gid;
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int r;
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@ -140,14 +146,14 @@ static int do_mount(const char *user) {
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: "Failed to look up user \"%s\": %m",
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user);
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r = acquire_runtime_dir_size(&runtime_dir_size);
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r = acquire_runtime_dir_properties(&runtime_dir_size, &runtime_dir_inodes);
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if (r < 0)
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return r;
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xsprintf(runtime_path, "/run/user/" UID_FMT, uid);
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log_debug("Will mount %s owned by "UID_FMT":"GID_FMT, runtime_path, uid, gid);
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return user_mkdir_runtime_path(runtime_path, uid, gid, runtime_dir_size);
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return user_mkdir_runtime_path(runtime_path, uid, gid, runtime_dir_size, runtime_dir_inodes);
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}
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static int do_umount(const char *user) {
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@ -865,6 +865,7 @@ RestrictNamespaces=
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RestrictRealtime=
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RestrictSUIDSGID=
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RuntimeDirectory=
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RuntimeDirectoryInodesMax=
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RuntimeDirectoryMode=
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RuntimeDirectoryPreserve=
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RuntimeDirectorySize=
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