build-sys: move source files to subdirectory

1 files changed, 578 insertions, 0 deletions

diff --git a/src/swap.c b/src/swap.c
new file mode 100644
index 0000000000..bd49e1ea2b
--- /dev/null
+++ b/src/swap.c
@@ -0,0 +1,578 @@
+/*-*- Mode: C; c-basic-offset: 8 -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2010 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 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
+  General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <limits.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/epoll.h>
+#include <sys/stat.h>
+#include <sys/swap.h>
+
+#include "unit.h"
+#include "swap.h"
+#include "load-fragment.h"
+#include "load-dropin.h"
+#include "unit-name.h"
+#include "dbus-swap.h"
+
+static const UnitActiveState state_translation_table[_SWAP_STATE_MAX] = {
+        [SWAP_DEAD] = UNIT_INACTIVE,
+        [SWAP_ACTIVE] = UNIT_ACTIVE,
+        [SWAP_MAINTAINANCE] = UNIT_INACTIVE
+};
+
+static void swap_init(Unit *u) {
+        Swap *s = SWAP(u);
+
+        assert(s);
+        assert(s->meta.load_state == UNIT_STUB);
+
+        s->parameters_etc_fstab.priority = s->parameters_proc_swaps.priority = s->parameters_fragment.priority = -1;
+}
+
+static void swap_done(Unit *u) {
+        Swap *s = SWAP(u);
+
+        assert(s);
+
+        free(s->what);
+        free(s->parameters_etc_fstab.what);
+        free(s->parameters_proc_swaps.what);
+        free(s->parameters_fragment.what);
+}
+
+int swap_add_one_mount_link(Swap *s, Mount *m) {
+         int r;
+
+        assert(s);
+        assert(m);
+
+        if (s->meta.load_state != UNIT_LOADED ||
+            m->meta.load_state != UNIT_LOADED)
+                return 0;
+
+        if (is_device_path(s->what))
+                return 0;
+
+        if (!path_startswith(s->what, m->where))
+                return 0;
+
+        if ((r = unit_add_dependency(UNIT(m), UNIT_BEFORE, UNIT(s), true)) < 0)
+                return r;
+
+        if ((r = unit_add_dependency(UNIT(s), UNIT_REQUIRES, UNIT(m), true)) < 0)
+                return r;
+
+        return 0;
+}
+
+static int swap_add_mount_links(Swap *s) {
+        Meta *other;
+        int r;
+
+        assert(s);
+
+        LIST_FOREACH(units_per_type, other, s->meta.manager->units_per_type[UNIT_MOUNT])
+                if ((r = swap_add_one_mount_link(s, (Mount*) other)) < 0)
+                        return r;
+
+        return 0;
+}
+
+static int swap_add_target_links(Swap *s) {
+        Unit *tu;
+        SwapParameters *p;
+        int r;
+
+        assert(s);
+
+        if (s->from_fragment)
+                p = &s->parameters_fragment;
+        else if (s->from_etc_fstab)
+                p = &s->parameters_etc_fstab;
+        else
+                return 0;
+
+        if ((r = manager_load_unit(s->meta.manager, SPECIAL_SWAP_TARGET, NULL, &tu)) < 0)
+                return r;
+
+        if (!p->noauto && p->handle)
+                if ((r = unit_add_dependency(tu, UNIT_WANTS, UNIT(s), true)) < 0)
+                        return r;
+
+        return unit_add_dependency(UNIT(s), UNIT_BEFORE, tu, true);
+}
+
+static int swap_verify(Swap *s) {
+        bool b;
+        char *e;
+
+        if (UNIT(s)->meta.load_state != UNIT_LOADED)
+                  return 0;
+
+        if (!(e = unit_name_from_path(s->what, ".swap")))
+                  return -ENOMEM;
+
+        b = unit_has_name(UNIT(s), e);
+        free(e);
+
+        if (!b) {
+                log_error("%s: Value of \"What\" and unit name do not match, not loading.\n", UNIT(s)->meta.id);
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
+static int swap_load(Unit *u) {
+        int r;
+        Swap *s = SWAP(u);
+
+        assert(s);
+        assert(u->meta.load_state == UNIT_STUB);
+
+        /* Load a .swap file */
+        if ((r = unit_load_fragment_and_dropin_optional(u)) < 0)
+                return r;
+
+        if (u->meta.load_state == UNIT_LOADED) {
+
+                if (s->meta.fragment_path)
+                        s->from_fragment = true;
+
+                if (!s->what) {
+                        if (s->parameters_fragment.what)
+                                s->what = strdup(s->parameters_fragment.what);
+                        else if (s->parameters_etc_fstab.what)
+                                s->what = strdup(s->parameters_etc_fstab.what);
+                        else if (s->parameters_proc_swaps.what)
+                                s->what = strdup(s->parameters_proc_swaps.what);
+                        else
+                                s->what = unit_name_to_path(u->meta.id);
+
+                        if (!s->what)
+                                return -ENOMEM;
+                }
+
+                path_kill_slashes(s->what);
+
+                if (!s->meta.description)
+                        if ((r = unit_set_description(u, s->what)) < 0)
+                                return r;
+
+                if ((r = unit_add_node_link(u, s->what,
+                                            (u->meta.manager->running_as == MANAGER_INIT ||
+                                             u->meta.manager->running_as == MANAGER_SYSTEM))) < 0)
+                        return r;
+
+                if ((r = swap_add_mount_links(s)) < 0)
+                        return r;
+
+                if ((r = swap_add_target_links(s)) < 0)
+                        return r;
+        }
+
+        return swap_verify(s);
+}
+
+static int swap_find(Manager *m, const char *what, Unit **_u) {
+        Unit *u;
+        char *e;
+
+        assert(m);
+        assert(what);
+        assert(_u);
+
+        /* /proc/swaps and /etc/fstab might refer to this device by
+         * different names (e.g. one by uuid, the other by the kernel
+         * name), we hence need to look for all aliases we are aware
+         * of for this device */
+
+        if (!(e = unit_name_from_path(what, ".device")))
+                return -ENOMEM;
+
+        u = manager_get_unit(m, e);
+        free(e);
+
+        if (u) {
+                Iterator i;
+                const char *d;
+
+                SET_FOREACH(d, u->meta.names, i) {
+                        Unit *k;
+
+                        if (!(e = unit_name_change_suffix(d, ".swap")))
+                                return -ENOMEM;
+
+                        k = manager_get_unit(m, e);
+                        free(e);
+
+                        if (k) {
+                                *_u = k;
+                                return 0;
+                        }
+                }
+        }
+
+        *_u = NULL;
+        return 0;
+}
+
+int swap_add_one(
+                Manager *m,
+                const char *what,
+                int priority,
+                bool noauto,
+                bool handle,
+                bool from_proc_swaps) {
+        Unit *u = NULL;
+        char *e = NULL, *w = NULL;
+        bool delete;
+        int r;
+        SwapParameters *p;
+
+        assert(m);
+        assert(what);
+
+        if (!(e = unit_name_from_path(what, ".swap")))
+                return -ENOMEM;
+
+        if (!(u = manager_get_unit(m, e)))
+                if ((r = swap_find(m, what, &u)) < 0)
+                        goto fail;
+
+        if (!u) {
+                delete = true;
+
+                if (!(u = unit_new(m))) {
+                        free(e);
+                        return -ENOMEM;
+                }
+        } else
+                delete = false;
+
+        if ((r = unit_add_name(u, e)) < 0)
+                goto fail;
+
+        if (!(w = strdup(what))) {
+                r = -ENOMEM;
+                goto fail;
+        }
+
+        if (from_proc_swaps) {
+                p = &SWAP(u)->parameters_proc_swaps;
+                SWAP(u)->from_proc_swaps = true;
+        } else {
+                p = &SWAP(u)->parameters_etc_fstab;
+                SWAP(u)->from_etc_fstab = true;
+        }
+
+        free(p->what);
+        p->what = w;
+
+        p->priority = priority;
+        p->noauto = noauto;
+        p->handle = handle;
+
+        if (delete)
+                unit_add_to_load_queue(u);
+
+        unit_add_to_dbus_queue(u);
+
+        free(e);
+
+        return 0;
+
+fail:
+        free(w);
+        free(e);
+
+        if (delete && u)
+                unit_free(u);
+
+        return r;
+}
+
+static void swap_set_state(Swap *s, SwapState state) {
+        SwapState old_state;
+        assert(s);
+
+        old_state = s->state;
+        s->state = state;
+
+        if (state != old_state)
+                log_debug("%s changed %s -> %s",
+                          UNIT(s)->meta.id,
+                          swap_state_to_string(old_state),
+                          swap_state_to_string(state));
+
+        unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state]);
+}
+
+static int swap_coldplug(Unit *u) {
+        Swap *s = SWAP(u);
+        SwapState new_state = SWAP_DEAD;
+
+        assert(s);
+        assert(s->state == SWAP_DEAD);
+
+        if (s->deserialized_state != s->state)
+                new_state = s->deserialized_state;
+        else if (s->from_proc_swaps)
+                new_state = SWAP_ACTIVE;
+
+        if (new_state != s->state)
+                swap_set_state(s, new_state);
+
+        return 0;
+}
+
+static void swap_dump(Unit *u, FILE *f, const char *prefix) {
+        Swap *s = SWAP(u);
+        SwapParameters *p;
+
+        assert(s);
+        assert(f);
+
+        if (s->from_proc_swaps)
+                p = &s->parameters_proc_swaps;
+        else if (s->from_fragment)
+                p = &s->parameters_fragment;
+        else
+                p = &s->parameters_etc_fstab;
+
+        fprintf(f,
+                "%sSwap State: %s\n"
+                "%sWhat: %s\n"
+                "%sPriority: %i\n"
+                "%sNoAuto: %s\n"
+                "%sHandle: %s\n"
+                "%sFrom /etc/fstab: %s\n"
+                "%sFrom /proc/swaps: %s\n"
+                "%sFrom fragment: %s\n",
+                prefix, swap_state_to_string(s->state),
+                prefix, s->what,
+                prefix, p->priority,
+                prefix, yes_no(p->noauto),
+                prefix, yes_no(p->handle),
+                prefix, yes_no(s->from_etc_fstab),
+                prefix, yes_no(s->from_proc_swaps),
+                prefix, yes_no(s->from_fragment));
+}
+
+static void swap_enter_dead(Swap *s, bool success) {
+        assert(s);
+
+        swap_set_state(s, success ? SWAP_MAINTAINANCE : SWAP_DEAD);
+}
+
+static int swap_start(Unit *u) {
+        Swap *s = SWAP(u);
+        int priority = -1;
+        int r;
+
+        assert(s);
+        assert(s->state == SWAP_DEAD || s->state == SWAP_MAINTAINANCE);
+
+        if (s->from_fragment)
+                priority = s->parameters_fragment.priority;
+        else if (s->from_etc_fstab)
+                priority = s->parameters_etc_fstab.priority;
+
+        r = swapon(s->what, (priority << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK);
+
+        if (r < 0 && errno != EBUSY) {
+                r = -errno;
+                swap_enter_dead(s, false);
+                return r;
+        }
+
+        swap_set_state(s, SWAP_ACTIVE);
+        return 0;
+}
+
+static int swap_stop(Unit *u) {
+        Swap *s = SWAP(u);
+        int r;
+
+        assert(s);
+
+        assert(s->state == SWAP_ACTIVE);
+
+        r = swapoff(s->what);
+        swap_enter_dead(s, r >= 0 || errno == EINVAL);
+
+        return 0;
+}
+
+static int swap_serialize(Unit *u, FILE *f, FDSet *fds) {
+        Swap *s = SWAP(u);
+
+        assert(s);
+        assert(f);
+        assert(fds);
+
+        unit_serialize_item(u, f, "state", swap_state_to_string(s->state));
+
+        return 0;
+}
+
+static int swap_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
+        Swap *s = SWAP(u);
+
+        assert(s);
+        assert(fds);
+
+        if (streq(key, "state")) {
+                SwapState state;
+
+                if ((state = swap_state_from_string(value)) < 0)
+                        log_debug("Failed to parse state value %s", value);
+                else
+                        s->deserialized_state = state;
+        } else
+                log_debug("Unknown serialization key '%s'", key);
+
+        return 0;
+}
+
+static UnitActiveState swap_active_state(Unit *u) {
+        assert(u);
+
+        return state_translation_table[SWAP(u)->state];
+}
+
+static const char *swap_sub_state_to_string(Unit *u) {
+        assert(u);
+
+        return swap_state_to_string(SWAP(u)->state);
+}
+
+static bool swap_check_gc(Unit *u) {
+        Swap *s = SWAP(u);
+
+        assert(s);
+
+        return s->from_etc_fstab || s->from_proc_swaps;
+}
+
+static int swap_load_proc_swaps(Manager *m) {
+        rewind(m->proc_swaps);
+
+        (void) fscanf(m->proc_swaps, "%*s %*s %*s %*s %*s\n");
+
+        for (;;) {
+                char *dev = NULL, *d;
+                int prio = 0, k;
+
+                if ((k = fscanf(m->proc_swaps,
+                                "%ms " /* device/file */
+                                "%*s " /* type of swap */
+                                "%*s " /* swap size */
+                                "%*s " /* used */
+                                "%i\n", /* priority */
+                                &dev, &prio)) != 2) {
+
+                        if (k == EOF)
+                                break;
+
+                        free(dev);
+                        return -EBADMSG;
+                }
+
+                d = cunescape(dev);
+                free(dev);
+
+                if (!d)
+                        return -ENOMEM;
+
+                k = swap_add_one(m, d, prio, false, false, true);
+                free(d);
+
+                if (k < 0)
+                        return k;
+        }
+
+        return 0;
+}
+
+static void swap_shutdown(Manager *m) {
+        assert(m);
+
+        if (m->proc_swaps) {
+                fclose(m->proc_swaps);
+                m->proc_swaps = NULL;
+        }
+}
+
+static const char* const swap_state_table[_SWAP_STATE_MAX] = {
+        [SWAP_DEAD] = "dead",
+        [SWAP_ACTIVE] = "active",
+        [SWAP_MAINTAINANCE] = "maintainance"
+};
+
+DEFINE_STRING_TABLE_LOOKUP(swap_state, SwapState);
+
+static int swap_enumerate(Manager *m) {
+        int r;
+        assert(m);
+
+        if (!m->proc_swaps)
+                if (!(m->proc_swaps = fopen("/proc/swaps", "re")))
+                        return -errno;
+
+        if ((r = swap_load_proc_swaps(m)) < 0)
+                swap_shutdown(m);
+
+        return r;
+}
+
+const UnitVTable swap_vtable = {
+        .suffix = ".swap",
+
+        .no_instances = true,
+        .no_isolate = true,
+
+        .init = swap_init,
+        .load = swap_load,
+        .done = swap_done,
+
+        .coldplug = swap_coldplug,
+
+        .dump = swap_dump,
+
+        .start = swap_start,
+        .stop = swap_stop,
+
+        .serialize = swap_serialize,
+        .deserialize_item = swap_deserialize_item,
+
+        .active_state = swap_active_state,
+        .sub_state_to_string = swap_sub_state_to_string,
+
+        .check_gc = swap_check_gc,
+
+        .bus_message_handler = bus_swap_message_handler,
+
+        .enumerate = swap_enumerate,
+        .shutdown = swap_shutdown
+};