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-rw-r--r--initd/early.c43
-rw-r--r--initd/init.h9
-rw-r--r--initd/zram.c128
3 files changed, 159 insertions, 21 deletions
diff --git a/initd/early.c b/initd/early.c
index c622aec..5a83d2c 100644
--- a/initd/early.c
+++ b/initd/early.c
@@ -25,25 +25,6 @@
#include "init.h"
static void
-early_mounts(void)
-{
- mount("proc", "/proc", "proc", MS_NOATIME, 0);
- mount("sysfs", "/sys", "sysfs", MS_NOATIME, 0);
- mount("none", "/sys/fs/cgroup", "cgroup", 0, 0);
-
- mount("tmpfs", "/tmp", "tmpfs", MS_NOSUID | MS_NODEV | MS_NOATIME, NULL);
- mkdir("/tmp/run", 0777);
- mkdir("/tmp/lock", 0777);
- mkdir("/tmp/state", 0777);
- symlink("/tmp", "/var");
-
- mount("tmpfs", "/dev", "tmpfs", MS_NOATIME, "mode=0755,size=512K");
- mkdir("/dev/shm", 0755);
- mkdir("/dev/pts", 0755);
- mount("devpts", "/dev/pts", "devpts", MS_NOATIME, "mode=600");
-}
-
-static void
early_dev(void)
{
mkdev("*", 0600);
@@ -78,6 +59,28 @@ early_console(const char *dev)
}
static void
+early_mounts(void)
+{
+ mount("proc", "/proc", "proc", MS_NOATIME, 0);
+ mount("sysfs", "/sys", "sysfs", MS_NOATIME, 0);
+ mount("tmpfs", "/dev", "tmpfs", MS_NOATIME, "mode=0755,size=512K");
+ mkdir("/dev/shm", 0755);
+ mkdir("/dev/pts", 0755);
+ mount("devpts", "/dev/pts", "devpts", MS_NOATIME, "mode=600");
+ early_dev();
+
+ early_console("/dev/console");
+ if (mount_zram_on_tmp())
+ mount("tmpfs", "/tmp", "tmpfs", MS_NOSUID | MS_NODEV | MS_NOATIME, NULL);
+ else
+ mkdev("*", 0600);
+ mkdir("/tmp/run", 0777);
+ mkdir("/tmp/lock", 0777);
+ mkdir("/tmp/state", 0777);
+ symlink("/tmp", "/var");
+}
+
+static void
early_env(void)
{
setenv("PATH", "/bin:/sbin:/usr/bin:/usr/sbin", 1);
@@ -90,9 +93,7 @@ early(void)
return;
early_mounts();
- early_dev();
early_env();
- early_console("/dev/console");
LOG("Console is alive\n");
}
diff --git a/initd/init.h b/initd/init.h
index 1321cf8..274645b 100644
--- a/initd/init.h
+++ b/initd/init.h
@@ -14,10 +14,19 @@
#ifndef _INIT_H__
#define _INIT_H__
+#include <errno.h>
+
#include "../log.h"
void preinit(void);
void early(void);
int mkdev(const char *progname, int progmode);
+#ifdef ZRAM_TMPFS
+int mount_zram_on_tmp(void);
+#else
+static inline int mount_zram_on_tmp(void) {
+ return -ENOSYS;
+}
+#endif
#endif
diff --git a/initd/zram.c b/initd/zram.c
new file mode 100644
index 0000000..4dc1d2e
--- /dev/null
+++ b/initd/zram.c
@@ -0,0 +1,128 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <fcntl.h>
+
+#include <sys/utsname.h>
+#include <sys/mount.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <sys/stat.h>
+
+#include "../log.h"
+
+#include "init.h"
+
+#define KB(x) (x * 1024)
+
+#define ZRAM_MOD_PATH "/lib/modules/%s/zram.ko"
+#define EXT4_MOD_PATH "/lib/modules/%s/ext4.ko"
+
+static long
+proc_meminfo(void)
+{
+ FILE *fp;
+ char line[256];
+ char *key;
+ long val = KB(16);
+
+ fp = fopen("/proc/meminfo", "r");
+ if (fp == NULL) {
+ ERROR("Can't open /proc/meminfo: %s\n", strerror(errno));
+ return errno;
+ }
+
+ while (fgets(line, sizeof(line), fp)) {
+ key = strtok(line, ":");
+ if (strcasecmp(key, "MemTotal"))
+ continue;
+ val = atol(strtok(NULL, " kB\n"));
+ break;
+ }
+ fclose(fp);
+
+ if (val > KB(32))
+ val = KB(16);
+
+ return val;
+}
+
+static int
+early_insmod(char *module)
+{
+ pid_t pid = fork();
+
+ if (!pid) {
+ char *modprobe[] = { "/usr/sbin/modprobe", NULL, NULL };
+ char *path;
+ struct utsname ver;
+
+ uname(&ver);
+ path = alloca(sizeof(module) + strlen(ver.release) + 1);
+ sprintf(path, module, ver.release);
+ modprobe[1] = path;
+ execvp(modprobe[0], modprobe);
+ ERROR("Can't exec /usr/sbin/modprobe\n");
+ exit(-1);
+ }
+
+ if (pid <= 0) {
+ ERROR("Can't exec /usr/sbin/modprobe\n");
+ return -1;
+ } else {
+ waitpid(pid, NULL, 0);
+ }
+
+ return 0;
+}
+
+
+int
+mount_zram_on_tmp(void)
+{
+ char *mkfs[] = { "/usr/sbin/mkfs.ext4", "-b", "4096", "-F", "-L", "TEMP", "-m", "0", "/dev/zram0", NULL };
+ FILE *fp;
+ long zramsize;
+ pid_t pid;
+ int ret;
+
+ if (early_insmod(ZRAM_MOD_PATH) || early_insmod(EXT4_MOD_PATH)) {
+ ERROR("failed to insmod zram support\n");
+ return -1;
+ }
+
+ mkdev("*", 0600);
+
+ zramsize = proc_meminfo() / 2;
+ fp = fopen("/sys/block/zram0/disksize", "r+");
+ if (fp == NULL) {
+ ERROR("Can't open /sys/block/zram0/disksize: %s\n", strerror(errno));
+ return errno;
+ }
+ fprintf(fp, "%ld", KB(zramsize));
+ fclose(fp);
+
+ pid = fork();
+ if (!pid) {
+ execvp(mkfs[0], mkfs);
+ ERROR("Can't exec /sbin/mkfs.ext4\n");
+ exit(-1);
+ } else if (pid <= 0) {
+ ERROR("Can't exec /sbin/mkfs.ext4\n");
+ return -1;
+ } else {
+ waitpid(pid, NULL, 0);
+ }
+
+ ret = mount("/dev/zram0", "/tmp", "ext4", MS_NOSUID | MS_NODEV | MS_NOATIME, "errors=continue,noquota");
+ if (ret < 0) {
+ ERROR("Can't mount /dev/zram0 on /tmp: %s\n", strerror(errno));
+ return errno;
+ }
+
+ LOG("Using up to %ld kB of RAM as ZRAM storage on /mnt\n", zramsize);
+
+ return 0;
+}