8 #include <sys/utsname.h>
10 #include <sys/types.h>
18 #define KB(x) (x * 1024)
20 #define ZRAM_MOD_PATH "/lib/modules/%s/zram.ko"
21 #define EXT4_MOD_PATH "/lib/modules/%s/ext4.ko"
31 fp
= fopen("/proc/meminfo", "r");
33 ERROR("Can't open /proc/meminfo: %s\n", strerror(errno
));
37 while (fgets(line
, sizeof(line
), fp
)) {
38 key
= strtok(line
, ":");
39 if (strcasecmp(key
, "MemTotal"))
41 val
= atol(strtok(NULL
, " kB\n"));
53 early_insmod(char *module
)
58 char *modprobe
[] = { "/usr/sbin/modprobe", NULL
, NULL
};
63 path
= alloca(sizeof(module
) + strlen(ver
.release
) + 1);
64 sprintf(path
, module
, ver
.release
);
66 execvp(modprobe
[0], modprobe
);
67 ERROR("Can't exec /usr/sbin/modprobe\n");
72 ERROR("Can't exec /usr/sbin/modprobe\n");
75 waitpid(pid
, NULL
, 0);
83 mount_zram_on_tmp(void)
85 char *mkfs
[] = { "/usr/sbin/mkfs.ext4", "-b", "4096", "-F", "-L", "TEMP", "-m", "0", "/dev/zram0", NULL
};
91 if (early_insmod(ZRAM_MOD_PATH
) || early_insmod(EXT4_MOD_PATH
)) {
92 ERROR("failed to insmod zram support\n");
98 zramsize
= proc_meminfo() / 2;
99 fp
= fopen("/sys/block/zram0/disksize", "r+");
101 ERROR("Can't open /sys/block/zram0/disksize: %s\n", strerror(errno
));
104 fprintf(fp
, "%ld", KB(zramsize
));
109 execvp(mkfs
[0], mkfs
);
110 ERROR("Can't exec /sbin/mkfs.ext4\n");
112 } else if (pid
<= 0) {
113 ERROR("Can't exec /sbin/mkfs.ext4\n");
116 waitpid(pid
, NULL
, 0);
119 ret
= mount("/dev/zram0", "/tmp", "ext4", MS_NOSUID
| MS_NODEV
| MS_NOATIME
, "errors=continue,noquota");
121 ERROR("Can't mount /dev/zram0 on /tmp: %s\n", strerror(errno
));
125 LOG("Using up to %ld kB of RAM as ZRAM storage on /mnt\n", zramsize
);