1 files changed, 56 insertions, 15 deletions

diff --git a/init/initramfs.c b/init/initramfs.c
index d9c941c0c3ca..d3c56fcb30b8 100644
--- a/init/initramfs.c
+++ b/init/initramfs.c
@@ -5,6 +5,7 @@
 #include <linux/fcntl.h>
 #include <linux/delay.h>
 #include <linux/string.h>
+#include <linux/dirent.h>
 #include <linux/syscalls.h>
 #include <linux/utime.h>
 
@@ -166,8 +167,6 @@ static __initdata char *victim;
 static __initdata unsigned count;
 static __initdata loff_t this_header, next_header;
 
-static __initdata int dry_run;
-
 static inline void __init eat(unsigned n)
 {
         victim += n;
@@ -229,10 +228,6 @@ static int __init do_header(void)
         parse_header(collected);
         next_header = this_header + N_ALIGN(name_len) + body_len;
         next_header = (next_header + 3) & ~3;
-        if (dry_run) {
-                read_into(name_buf, N_ALIGN(name_len), GotName);
-                return 0;
-        }
         state = SkipIt;
         if (name_len <= 0 || name_len > PATH_MAX)
                 return 0;
@@ -303,8 +298,6 @@ static int __init do_name(void)
                 free_hash();
                 return 0;
         }
-        if (dry_run)
-                return 0;
         clean_path(collected, mode);
         if (S_ISREG(mode)) {
                 int ml = maybe_link();
@@ -476,10 +469,9 @@ static void __init flush_window(void)
         outcnt = 0;
 }
 
-static char * __init unpack_to_rootfs(char *buf, unsigned len, int check_only)
+static char * __init unpack_to_rootfs(char *buf, unsigned len)
 {
         int written;
-        dry_run = check_only;
         header_buf = kmalloc(110, GFP_KERNEL);
         symlink_buf = kmalloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1, GFP_KERNEL);
         name_buf = kmalloc(N_ALIGN(PATH_MAX), GFP_KERNEL);
@@ -574,10 +566,57 @@ skip:
         initrd_end = 0;
 }
 
+#define BUF_SIZE 1024
+static void __init clean_rootfs(void)
+{
+        int fd;
+        void *buf;
+        struct linux_dirent64 *dirp;
+        int count;
+
+        fd = sys_open("/", O_RDONLY, 0);
+        WARN_ON(fd < 0);
+        if (fd < 0)
+                return;
+        buf = kzalloc(BUF_SIZE, GFP_KERNEL);
+        WARN_ON(!buf);
+        if (!buf) {
+                sys_close(fd);
+                return;
+        }
+
+        dirp = buf;
+        count = sys_getdents64(fd, dirp, BUF_SIZE);
+        while (count > 0) {
+                while (count > 0) {
+                        struct stat st;
+                        int ret;
+
+                        ret = sys_newlstat(dirp->d_name, &st);
+                        WARN_ON_ONCE(ret);
+                        if (!ret) {
+                                if (S_ISDIR(st.st_mode))
+                                        sys_rmdir(dirp->d_name);
+                                else
+                                        sys_unlink(dirp->d_name);
+                        }
+
+                        count -= dirp->d_reclen;
+                        dirp = (void *)dirp + dirp->d_reclen;
+                }
+                dirp = buf;
+                memset(buf, 0, BUF_SIZE);
+                count = sys_getdents64(fd, dirp, BUF_SIZE);
+        }
+
+        sys_close(fd);
+        kfree(buf);
+}
+
 static int __init populate_rootfs(void)
 {
         char *err = unpack_to_rootfs(__initramfs_start,
-                         __initramfs_end - __initramfs_start, 0);
+                         __initramfs_end - __initramfs_start);
         if (err)
                 panic(err);
         if (initrd_start) {
@@ -585,13 +624,15 @@ static int __init populate_rootfs(void)
                 int fd;
                 printk(KERN_INFO "checking if image is initramfs...");
                 err = unpack_to_rootfs((char *)initrd_start,
-                        initrd_end - initrd_start, 1);
+                        initrd_end - initrd_start);
                 if (!err) {
                         printk(" it is\n");
-                        unpack_to_rootfs((char *)initrd_start,
-                                initrd_end - initrd_start, 0);
                         free_initrd();
                         return 0;
+                } else {
+                        clean_rootfs();
+                        unpack_to_rootfs(__initramfs_start,
+                                 __initramfs_end - __initramfs_start);
                 }
                 printk("it isn't (%s); looks like an initrd\n", err);
                 fd = sys_open("/initrd.image", O_WRONLY|O_CREAT, 0700);
@@ -604,7 +645,7 @@ static int __init populate_rootfs(void)
 #else
                 printk(KERN_INFO "Unpacking initramfs...");
                 err = unpack_to_rootfs((char *)initrd_start,
-                        initrd_end - initrd_start, 0);
+                        initrd_end - initrd_start);
                 if (err)
                         panic(err);
                 printk(" done\n");