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Diffstat (limited to 'init')
-rw-r--r--init/initramfs.c71
1 files changed, 56 insertions, 15 deletions
diff --git a/init/initramfs.c b/init/initramfs.c
index d9c941c0c3c..d3c56fcb30b 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");