1 files changed, 110 insertions, 0 deletions
diff --git a/src/shutdown/detach-swap.c b/src/shutdown/detach-swap.c
new file mode 100644
index 0000000..fd7dcdf
--- /dev/null
+++ b/src/shutdown/detach-swap.c
@@ -0,0 +1,110 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/***
+  Copyright © 2010 ProFUSION embedded systems
+***/
+
+#include <sys/swap.h>
+
+#include "alloc-util.h"
+#include "detach-swap.h"
+#include "libmount-util.h"
+
+static void swap_device_free(SwapDevice **head, SwapDevice *m) {
+        assert(head);
+        assert(m);
+
+        LIST_REMOVE(swap_device, *head, m);
+
+        free(m->path);
+        free(m);
+}
+
+void swap_devices_list_free(SwapDevice **head) {
+        assert(head);
+
+        while (*head)
+                swap_device_free(head, *head);
+}
+
+int swap_list_get(const char *swaps, SwapDevice **head) {
+        _cleanup_(mnt_free_tablep) struct libmnt_table *t = NULL;
+        _cleanup_(mnt_free_iterp) struct libmnt_iter *i = NULL;
+        int r;
+
+        assert(head);
+
+        t = mnt_new_table();
+        i = mnt_new_iter(MNT_ITER_FORWARD);
+        if (!t || !i)
+                return log_oom();
+
+        r = mnt_table_parse_swaps(t, swaps);
+        if (r == -ENOENT) /* no /proc/swaps is fine */
+                return 0;
+        if (r < 0)
+                return log_error_errno(r, "Failed to parse %s: %m", swaps ?: "/proc/swaps");
+
+        for (;;) {
+                struct libmnt_fs *fs;
+                _cleanup_free_ SwapDevice *swap = NULL;
+                const char *source;
+
+                r = mnt_table_next_fs(t, i, &fs);
+                if (r == 1) /* EOF */
+                        break;
+                if (r < 0)
+                        return log_error_errno(r, "Failed to get next entry from %s: %m", swaps ?: "/proc/swaps");
+
+                source = mnt_fs_get_source(fs);
+                if (!source)
+                        continue;
+
+                swap = new0(SwapDevice, 1);
+                if (!swap)
+                        return log_oom();
+
+                swap->path = strdup(source);
+                if (!swap->path)
+                        return log_oom();
+
+                LIST_PREPEND(swap_device, *head, TAKE_PTR(swap));
+        }
+
+        return 0;
+}
+
+static int swap_points_list_off(SwapDevice **head, bool *changed) {
+        int n_failed = 0;
+
+        assert(head);
+        assert(changed);
+
+        LIST_FOREACH(swap_device, m, *head) {
+                log_info("Deactivating swap %s.", m->path);
+                if (swapoff(m->path) < 0) {
+                        log_warning_errno(errno, "Could not deactivate swap %s: %m", m->path);
+                        n_failed++;
+                        continue;
+                }
+
+                *changed = true;
+                swap_device_free(head, m);
+        }
+
+        return n_failed;
+}
+
+int swapoff_all(bool *changed) {
+        _cleanup_(swap_devices_list_free) LIST_HEAD(SwapDevice, swap_list_head);
+        int r;
+
+        assert(changed);
+
+        LIST_HEAD_INIT(swap_list_head);
+
+        r = swap_list_get(NULL, &swap_list_head);
+        if (r < 0)
+                return r;
+
+        return swap_points_list_off(&swap_list_head, changed);
+}