chiark / gitweb /
manager: introduce IgnoreOnIsolate flag so that we can keep systemd-logger around...
[elogind.git] / src / mount.c
index d9f3da6..2b19f49 100644 (file)
@@ -37,6 +37,7 @@
 #include "special.h"
 #include "bus-errors.h"
 #include "exit-status.h"
+#include "def.h"
 
 static const UnitActiveState state_translation_table[_MOUNT_STATE_MAX] = {
         [MOUNT_DEAD] = UNIT_INACTIVE,
@@ -65,6 +66,11 @@ static void mount_init(Unit *u) {
 
         exec_context_init(&m->exec_context);
 
+        /* The stdio/kmsg bridge socket is on /, in order to avoid a
+         * dep loop, don't use kmsg logging for -.mount */
+        if (!unit_has_name(u, "-.mount"))
+                m->exec_context.std_output = EXEC_OUTPUT_KMSG;
+
         /* We need to make sure that /bin/mount is always called in
          * the same process group as us, so that the autofs kernel
          * side doesn't send us another mount request while we are
@@ -74,6 +80,8 @@ static void mount_init(Unit *u) {
         m->timer_watch.type = WATCH_INVALID;
 
         m->control_command_id = _MOUNT_EXEC_COMMAND_INVALID;
+
+        m->meta.ignore_on_isolate = true;
 }
 
 static void mount_unwatch_control_pid(Mount *m) {
@@ -126,6 +134,26 @@ static void mount_done(Unit *u) {
         unit_unwatch_timer(u, &m->timer_watch);
 }
 
+static MountParameters* get_mount_parameters_configured(Mount *m) {
+        assert(m);
+
+        if (m->from_fragment)
+                return &m->parameters_fragment;
+        else if (m->from_etc_fstab)
+                return &m->parameters_etc_fstab;
+
+        return NULL;
+}
+
+static MountParameters* get_mount_parameters(Mount *m) {
+        assert(m);
+
+        if (m->from_proc_self_mountinfo)
+                return &m->parameters_proc_self_mountinfo;
+
+        return get_mount_parameters_configured(m);
+}
+
 static int mount_add_mount_links(Mount *m) {
         Meta *other;
         int r;
@@ -133,12 +161,7 @@ static int mount_add_mount_links(Mount *m) {
 
         assert(m);
 
-        if (m->from_fragment)
-                pm = &m->parameters_fragment;
-        else if (m->from_etc_fstab)
-                pm = &m->parameters_etc_fstab;
-        else
-                pm = NULL;
+        pm = get_mount_parameters_configured(m);
 
         /* Adds in links to other mount points that might lie below or
          * above us in the hierarchy */
@@ -153,19 +176,14 @@ static int mount_add_mount_links(Mount *m) {
                 if (n->meta.load_state != UNIT_LOADED)
                         continue;
 
-                if (n->from_fragment)
-                        pn = &n->parameters_fragment;
-                else if (n->from_etc_fstab)
-                        pn = &n->parameters_etc_fstab;
-                else
-                        pn = NULL;
+                pn = get_mount_parameters_configured(n);
 
                 if (path_startswith(m->where, n->where)) {
 
                         if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(n), true)) < 0)
                                 return r;
 
-                        if (n->from_etc_fstab || n->from_fragment)
+                        if (pn)
                                 if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(n), true)) < 0)
                                         return r;
 
@@ -174,7 +192,7 @@ static int mount_add_mount_links(Mount *m) {
                         if ((r = unit_add_dependency(UNIT(n), UNIT_AFTER, UNIT(m), true)) < 0)
                                 return r;
 
-                        if (m->from_etc_fstab || m->from_fragment)
+                        if (pm)
                                 if ((r = unit_add_dependency(UNIT(n), UNIT_REQUIRES, UNIT(m), true)) < 0)
                                         return r;
 
@@ -183,18 +201,16 @@ static int mount_add_mount_links(Mount *m) {
                         if ((r = unit_add_dependency(UNIT(m), UNIT_AFTER, UNIT(n), true)) < 0)
                                 return r;
 
-                        if (m->from_etc_fstab || m->from_fragment)
-                                if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(n), true)) < 0)
-                                        return r;
+                        if ((r = unit_add_dependency(UNIT(m), UNIT_REQUIRES, UNIT(n), true)) < 0)
+                                return r;
 
                 } else if (pn && path_startswith(pn->what, m->where)) {
 
                         if ((r = unit_add_dependency(UNIT(n), UNIT_AFTER, UNIT(m), true)) < 0)
                                 return r;
 
-                        if (n->from_etc_fstab || n->from_fragment)
-                                if ((r = unit_add_dependency(UNIT(n), UNIT_REQUIRES, UNIT(m), true)) < 0)
-                                        return r;
+                        if ((r = unit_add_dependency(UNIT(n), UNIT_REQUIRES, UNIT(m), true)) < 0)
+                                return r;
                 }
         }
 
@@ -270,6 +286,43 @@ static char* mount_test_option(const char *haystack, const char *needle) {
         return hasmntopt(&me, needle);
 }
 
+static bool mount_is_network(MountParameters *p) {
+        assert(p);
+
+        if (mount_test_option(p->options, "_netdev"))
+                return true;
+
+        if (p->fstype && fstype_is_network(p->fstype))
+                return true;
+
+        return false;
+}
+
+static bool mount_is_bind(MountParameters *p) {
+        assert(p);
+
+        if (mount_test_option(p->options, "bind"))
+                return true;
+
+        if (p->fstype && streq(p->fstype, "bind"))
+                return true;
+
+        return false;
+}
+
+static bool needs_quota(MountParameters *p) {
+        assert(p);
+
+        if (mount_is_network(p))
+                return false;
+
+        if (mount_is_bind(p))
+                return false;
+
+        return mount_test_option(p->options, "usrquota") ||
+                mount_test_option(p->options, "grpquota");
+}
+
 static int mount_add_target_links(Mount *m) {
         const char *target, *after = NULL;
         MountParameters *p;
@@ -279,21 +332,20 @@ static int mount_add_target_links(Mount *m) {
 
         assert(m);
 
-        if (m->from_fragment)
-                p = &m->parameters_fragment;
-        else if (m->from_etc_fstab)
-                p = &m->parameters_etc_fstab;
-        else
+        if (!(p = get_mount_parameters_configured(m)))
                 return 0;
 
         noauto = !!mount_test_option(p->options, MNTOPT_NOAUTO);
         nofail = !!mount_test_option(p->options, "nofail");
-        handle = !!mount_test_option(p->options, "comment=systemd.mount") ||
+        handle =
+                mount_test_option(p->options, "comment=systemd.mount") ||
+                mount_test_option(p->options, "x-systemd-mount") ||
                 m->meta.manager->mount_auto;
-        automount = !!mount_test_option(p->options, "comment=systemd.automount");
+        automount =
+                mount_test_option(p->options, "comment=systemd.automount") ||
+                mount_test_option(p->options, "x-systemd-automount");
 
-        if (mount_test_option(p->options, "_netdev") ||
-            (p->fstype && fstype_is_network(p->fstype))) {
+        if (mount_is_network(p)) {
                 target = SPECIAL_REMOTE_FS_TARGET;
 
                 if (m->meta.manager->running_as == MANAGER_SYSTEM)
@@ -305,7 +357,7 @@ static int mount_add_target_links(Mount *m) {
                 return r;
 
         if (after)
-                if ((r = unit_add_dependency_by_name(tu, UNIT_AFTER, after, NULL, true)) < 0)
+                if ((r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, after, NULL, true)) < 0)
                         return r;
 
         if (automount && m->meta.manager->running_as == MANAGER_SYSTEM) {
@@ -331,29 +383,13 @@ static int mount_add_target_links(Mount *m) {
         }
 }
 
-static bool mount_is_bind(MountParameters *p) {
-        assert(p);
-
-        if (p->fstype && streq(p->fstype, "bind"))
-                return true;
-
-        if (mount_test_option(p->options, "bind"))
-                return true;
-
-        return false;
-}
-
 static int mount_add_device_links(Mount *m) {
         MountParameters *p;
         int r;
 
         assert(m);
 
-        if (m->from_fragment)
-                p = &m->parameters_fragment;
-        else if (m->from_etc_fstab)
-                p = &m->parameters_etc_fstab;
-        else
+        if (!(p = get_mount_parameters_configured(m)))
                 return 0;
 
         if (!p->what)
@@ -407,9 +443,15 @@ static int mount_add_default_dependencies(Mount *m) {
 
         if (m->meta.manager->running_as == MANAGER_SYSTEM &&
             !path_equal(m->where, "/")) {
+                MountParameters *p;
 
-                if ((r = unit_add_dependency_by_name(UNIT(m), UNIT_BEFORE, SPECIAL_QUOTACHECK_SERVICE, NULL, true)) < 0)
-                        return r;
+                p = get_mount_parameters_configured(m);
+
+                if (p && needs_quota(p)) {
+                        if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTACHECK_SERVICE, NULL, true)) < 0 ||
+                            (r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_WANTS, SPECIAL_QUOTAON_SERVICE, NULL, true)) < 0)
+                                return r;
+                }
 
                 if ((r = unit_add_two_dependencies_by_name(UNIT(m), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_UMOUNT_TARGET, NULL, true)) < 0)
                         return r;
@@ -440,6 +482,11 @@ static int mount_verify(Mount *m) {
                 return -EINVAL;
         }
 
+        if (mount_point_is_api(m->where) || mount_point_ignore(m->where)) {
+                log_error("Cannot create mount unit for API file system %s. Refusing.", m->where);
+                return -EINVAL;
+        }
+
         if (m->meta.fragment_path && !m->parameters_fragment.what) {
                 log_error("%s's What setting is missing. Refusing.", m->meta.id);
                 return -EBADMSG;
@@ -465,6 +512,9 @@ static int mount_load(Unit *u) {
 
         /* This is a new unit? Then let's add in some extras */
         if (u->meta.load_state == UNIT_LOADED) {
+                if ((r = unit_add_exec_dependencies(u, &m->exec_context)) < 0)
+                        return r;
+
                 if (m->meta.fragment_path)
                         m->from_fragment = true;
 
@@ -618,12 +668,7 @@ static void mount_dump(Unit *u, FILE *f, const char *prefix) {
         assert(m);
         assert(f);
 
-        if (m->from_proc_self_mountinfo)
-                p = &m->parameters_proc_self_mountinfo;
-        else if (m->from_fragment)
-                p = &m->parameters_fragment;
-        else
-                p = &m->parameters_etc_fstab;
+        p = get_mount_parameters(m);
 
         fprintf(f,
                 "%sMount State: %s\n"
@@ -725,9 +770,7 @@ static void mount_enter_signal(Mount *m, MountState state, bool success) {
                            state == MOUNT_REMOUNTING_SIGTERM) ? m->exec_context.kill_signal : SIGKILL;
 
                 if (m->control_pid > 0) {
-                        if (kill(m->exec_context.kill_mode == KILL_PROCESS_GROUP ?
-                                 -m->control_pid :
-                                 m->control_pid, sig) < 0 && errno != ESRCH)
+                        if (kill_and_sigcont(m->control_pid, sig) < 0 && errno != ESRCH)
 
                                 log_warning("Failed to kill control process %li: %m", (long) m->control_pid);
                         else
@@ -746,13 +789,14 @@ static void mount_enter_signal(Mount *m, MountState state, bool success) {
                                 if ((r = set_put(pid_set, LONG_TO_PTR(m->control_pid))) < 0)
                                         goto fail;
 
-                        if ((r = cgroup_bonding_kill_list(m->meta.cgroup_bondings, sig, pid_set)) < 0) {
+                        if ((r = cgroup_bonding_kill_list(m->meta.cgroup_bondings, sig, true, pid_set)) < 0) {
                                 if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
                                         log_warning("Failed to kill control group: %s", strerror(-r));
                         } else if (r > 0)
                                 wait_for_exit = true;
 
                         set_free(pid_set);
+                        pid_set = NULL;
                 }
         }
 
@@ -814,6 +858,7 @@ fail:
 
 static void mount_enter_mounting(Mount *m) {
         int r;
+        MountParameters *p;
 
         assert(m);
 
@@ -822,6 +867,11 @@ static void mount_enter_mounting(Mount *m) {
 
         mkdir_p(m->where, m->directory_mode);
 
+        /* Create the source directory for bind-mounts if needed */
+        p = get_mount_parameters_configured(m);
+        if (p && mount_is_bind(p))
+                mkdir_p(p->what, m->directory_mode);
+
         if (m->from_fragment)
                 r = exec_command_set(
                                 m->control_command,
@@ -1261,9 +1311,7 @@ static int mount_add_one(
 
         /* Ignore API mount points. They should never be referenced in
          * dependencies ever. */
-        if (mount_point_is_api(where))
-                return 0;
-        if (mount_point_ignore(where))
+        if (mount_point_is_api(where) || mount_point_ignore(where))
                 return 0;
 
         if (streq(fstype, "autofs"))
@@ -1658,7 +1706,7 @@ static int mount_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError
         }
 
         if (m->control_pid > 0)
-                if (kill(mode == KILL_PROCESS_GROUP ? -m->control_pid : m->control_pid, signo) < 0)
+                if (kill(m->control_pid, signo) < 0)
                         r = -errno;
 
         if (mode == KILL_CONTROL_GROUP) {
@@ -1674,7 +1722,7 @@ static int mount_kill(Unit *u, KillWho who, KillMode mode, int signo, DBusError
                                 goto finish;
                         }
 
-                if ((q = cgroup_bonding_kill_list(m->meta.cgroup_bondings, signo, pid_set)) < 0)
+                if ((q = cgroup_bonding_kill_list(m->meta.cgroup_bondings, signo, false, pid_set)) < 0)
                         if (r != -EAGAIN && r != -ESRCH && r != -ENOENT)
                                 r = q;
         }
@@ -1717,7 +1765,6 @@ const UnitVTable mount_vtable = {
 
         .no_alias = true,
         .no_instances = true,
-        .no_isolate = true,
         .show_status = true,
 
         .init = mount_init,