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[sfrench/cifs-2.6.git] / init / initramfs.c

diff --git a/init/initramfs.c b/init/initramfs.c
index 7dcde7ea660306801958857fdce54c7ee56bce9b..80cd713f6cc5cc8b3f09317534acebdf4983903a 100644 (file)
--- 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();
@@ -417,14 +410,13 @@ static unsigned my_inptr;   /* index of next byte to be processed in inbuf */
 
 #include <linux/decompress/generic.h>
 
-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;
        decompress_fn decompress;
        const char *compress_name;
        static __initdata char msg_buf[64];
 
-       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);
@@ -523,26 +515,76 @@ 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);     /* Failed to decompress INTERNAL initramfs */
        if (initrd_start) {
 #ifdef CONFIG_BLK_DEV_RAM
                int fd;
-               printk(KERN_INFO "checking if image is initramfs...");
+               printk(KERN_INFO "checking if image is initramfs...\n");
                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);
+                       printk(KERN_INFO "rootfs image is initramfs; unpacking...\n");
                        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);
+               printk(KERN_INFO "rootfs image is not initramfs (%s)"
+                               "; looks like an initrd\n", err);
                fd = sys_open("/initrd.image", O_WRONLY|O_CREAT, 0700);
                if (fd >= 0) {
                        sys_write(fd, (char *)initrd_start,
@@ -553,7 +595,7 @@ 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) {
                        printk(" failed!\n");
                        printk(KERN_EMERG "%s\n", err);