swapon: support "pri=NNN" in fstab

function                                             old     new   delta
swap_on_off_main                                     244     365    +121

Signed-off-by: Tito Ragusa <farmatito@tiscali.it>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/util-linux/swaponoff.c b/util-linux/swaponoff.c
index 54867ec36..afad4ab8f 100644
--- a/util-linux/swaponoff.c
+++ b/util-linux/swaponoff.c
@@ -95,6 +95,20 @@ static int do_em_all(void)
                         if (applet_name[5] != 'n'
                          || hasmntopt(m, MNTOPT_NOAUTO) == NULL
                         ) {
+#if ENABLE_FEATURE_SWAPON_PRI
+                                char *p;
+                                g_flags = 0; /* each swap space might have different flags */
+                                p = strstr(m->mnt_opts, "pri=");
+                                if (p) {
+                                        /* Max allowed 32767 (==SWAP_FLAG_PRIO_MASK) */
+                                        int swap_prio = MIN(bb_strtoull(p + 4 , NULL, 10), SWAP_FLAG_PRIO_MASK);
+                                        /* We want to allow "NNNN,foo", thus errno == EINVAL is allowed too */
+                                        if (errno != ERANGE) {
+                                                g_flags = SWAP_FLAG_PREFER |
+                                                        (swap_prio << SWAP_FLAG_PRIO_SHIFT);
+                                        }
+                                }
+#endif
                                 err += swap_enable_disable(m->mnt_fsname);
                         }
                 }