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-rw-r--r--util-linux/Config.in7
-rw-r--r--util-linux/swaponoff.c37
2 files changed, 38 insertions, 6 deletions
diff --git a/util-linux/Config.in b/util-linux/Config.in
index c30091a7a..3b7630e6b 100644
--- a/util-linux/Config.in
+++ b/util-linux/Config.in
@@ -743,6 +743,13 @@ config SWAPONOFF
space. If you are not using any swap space, you can leave this
option disabled.
+config FEATURE_SWAPON_PRI
+ bool "Support option -p in swapon"
+ default n
+ depends on SWAPONOFF
+ help
+ Enable support for setting swap device priority in swapon.
+
config SWITCH_ROOT
bool "switch_root"
default n
diff --git a/util-linux/swaponoff.c b/util-linux/swaponoff.c
index beefac030..6eafa3e21 100644
--- a/util-linux/swaponoff.c
+++ b/util-linux/swaponoff.c
@@ -11,6 +11,16 @@
#include <mntent.h>
#include <sys/swap.h>
+#if ENABLE_FEATURE_SWAPON_PRI
+struct globals {
+ int flags;
+};
+#define G (*(struct globals*)&bb_common_bufsiz1)
+#define g_flags (G.flags)
+#else
+#define g_flags 0
+#endif
+
static int swap_enable_disable(char *device)
{
int status;
@@ -26,7 +36,7 @@ static int swap_enable_disable(char *device)
#endif
if (applet_name[5] == 'n')
- status = swapon(device, 0);
+ status = swapon(device, g_flags);
else
status = swapoff(device);
@@ -63,15 +73,30 @@ int swap_on_off_main(int argc ATTRIBUTE_UNUSED, char **argv)
{
int ret;
- if (!argv[1])
- bb_show_usage();
-
+#if !ENABLE_FEATURE_SWAPON_PRI
ret = getopt32(argv, "a");
- if (ret)
+#else
+ opt_complementary = "p+";
+ ret = getopt32(argv, (applet_name[5] == 'n') ? "ap:" : "a", &g_flags);
+
+ if (ret & 2) { // -p
+ g_flags = SWAP_FLAG_PREFER |
+ ((g_flags & SWAP_FLAG_PRIO_MASK) << SWAP_FLAG_PRIO_SHIFT);
+ ret &= 1;
+ }
+#endif
+
+ if (ret /* & 1: not needed */) // -a
return do_em_all();
+ argv += optind;
+ if (!*argv)
+ bb_show_usage();
+
/* ret = 0; redundant */
- while (*++argv)
+ do {
ret += swap_enable_disable(*argv);
+ } while (*++argv);
+
return ret;
}