initramfs: support initramfs that is bigger than 2GiB

Now with 64bit bzImage and kexec tools, we support ramdisk that size is
bigger than 2g, as we could put it above 4G.

Found compressed initramfs image could not be decompressed properly.  It
turns out that image length is int during decompress detection, and it
will become < 0 when length is more than 2G.  Furthermore, during
decompressing len as int is used for inbuf count, that has problem too.

Change len to long, that should be ok as on 32 bit platform long is
32bits.

Tested with following compressed initramfs image as root with kexec.
	gzip, bzip2, xz, lzma, lzop, lz4.
run time for populate_rootfs():
   size        name       Nehalem-EX  Westmere-EX  Ivybridge-EX
 9034400256 root_img     :   26s           24s          30s
 3561095057 root_img.lz4 :   28s           27s          27s
 3459554629 root_img.lzo :   29s           29s          28s
 3219399480 root_img.gz  :   64s           62s          49s
 2251594592 root_img.xz  :  262s          260s         183s
 2226366598 root_img.lzma:  386s          376s         277s
 2901482513 root_img.bz2 :  635s          599s

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Rashika Kheria <rashika.kheria@gmail.com>
Cc: Josh Triplett <josh@joshtriplett.org>
Cc: Kyungsik Lee <kyungsik.lee@lge.com>
Cc: P J P <ppandit@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Cc: "Daniel M. Weeks" <dan@danweeks.net>
Cc: Alexandre Courbot <acourbot@nvidia.com>
Cc: Jan Beulich <JBeulich@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

7 files changed, 29 insertions, 29 deletions

diff --git a/include/linux/decompress/bunzip2.h b/include/linux/decompress/bunzip2.h
index 115272137a9c..4d683df898e6 100644
--- a/include/linux/decompress/bunzip2.h
+++ b/include/linux/decompress/bunzip2.h
@@ -1,10 +1,10 @@
 #ifndef DECOMPRESS_BUNZIP2_H
 #define DECOMPRESS_BUNZIP2_H
 
-int bunzip2(unsigned char *inbuf, int len,
-	    int(*fill)(void*, unsigned int),
-	    int(*flush)(void*, unsigned int),
+int bunzip2(unsigned char *inbuf, long len,
+	    long (*fill)(void*, unsigned long),
+	    long (*flush)(void*, unsigned long),
 	    unsigned char *output,
-	    int *pos,
+	    long *pos,
 	    void(*error)(char *x));
 #endif
diff --git a/include/linux/decompress/generic.h b/include/linux/decompress/generic.h
index 0c7111a55a1a..1fcfd64b5076 100644
--- a/include/linux/decompress/generic.h
+++ b/include/linux/decompress/generic.h
@@ -1,11 +1,11 @@
 #ifndef DECOMPRESS_GENERIC_H
 #define DECOMPRESS_GENERIC_H
 
-typedef int (*decompress_fn) (unsigned char *inbuf, int len,
-			      int(*fill)(void*, unsigned int),
-			      int(*flush)(void*, unsigned int),
+typedef int (*decompress_fn) (unsigned char *inbuf, long len,
+			      long (*fill)(void*, unsigned long),
+			      long (*flush)(void*, unsigned long),
 			      unsigned char *outbuf,
-			      int *posp,
+			      long *posp,
 			      void(*error)(char *x));
 
 /* inbuf   - input buffer
@@ -33,7 +33,7 @@ typedef int (*decompress_fn) (unsigned char *inbuf, int len,
 
 
 /* Utility routine to detect the decompression method */
-decompress_fn decompress_method(const unsigned char *inbuf, int len,
+decompress_fn decompress_method(const unsigned char *inbuf, long len,
 				const char **name);
 
 #endif
diff --git a/include/linux/decompress/inflate.h b/include/linux/decompress/inflate.h
index 1d0aedef9822..e4f411fdbd24 100644
--- a/include/linux/decompress/inflate.h
+++ b/include/linux/decompress/inflate.h
@@ -1,10 +1,10 @@
 #ifndef LINUX_DECOMPRESS_INFLATE_H
 #define LINUX_DECOMPRESS_INFLATE_H
 
-int gunzip(unsigned char *inbuf, int len,
-	   int(*fill)(void*, unsigned int),
-	   int(*flush)(void*, unsigned int),
+int gunzip(unsigned char *inbuf, long len,
+	   long (*fill)(void*, unsigned long),
+	   long (*flush)(void*, unsigned long),
 	   unsigned char *output,
-	   int *pos,
+	   long *pos,
 	   void(*error_fn)(char *x));
 #endif
diff --git a/include/linux/decompress/unlz4.h b/include/linux/decompress/unlz4.h
index d5b68bf3ec92..3273c2f36496 100644
--- a/include/linux/decompress/unlz4.h
+++ b/include/linux/decompress/unlz4.h
@@ -1,10 +1,10 @@
 #ifndef DECOMPRESS_UNLZ4_H
 #define DECOMPRESS_UNLZ4_H
 
-int unlz4(unsigned char *inbuf, int len,
-	int(*fill)(void*, unsigned int),
-	int(*flush)(void*, unsigned int),
+int unlz4(unsigned char *inbuf, long len,
+	long (*fill)(void*, unsigned long),
+	long (*flush)(void*, unsigned long),
 	unsigned char *output,
-	int *pos,
+	long *pos,
 	void(*error)(char *x));
 #endif
diff --git a/include/linux/decompress/unlzma.h b/include/linux/decompress/unlzma.h
index 7796538f1bf4..8a891a193840 100644
--- a/include/linux/decompress/unlzma.h
+++ b/include/linux/decompress/unlzma.h
@@ -1,11 +1,11 @@
 #ifndef DECOMPRESS_UNLZMA_H
 #define DECOMPRESS_UNLZMA_H
 
-int unlzma(unsigned char *, int,
-	   int(*fill)(void*, unsigned int),
-	   int(*flush)(void*, unsigned int),
+int unlzma(unsigned char *, long,
+	   long (*fill)(void*, unsigned long),
+	   long (*flush)(void*, unsigned long),
 	   unsigned char *output,
-	   int *posp,
+	   long *posp,
 	   void(*error)(char *x)
 	);
 
diff --git a/include/linux/decompress/unlzo.h b/include/linux/decompress/unlzo.h
index 987229752519..af18f95d6570 100644
--- a/include/linux/decompress/unlzo.h
+++ b/include/linux/decompress/unlzo.h
@@ -1,10 +1,10 @@
 #ifndef DECOMPRESS_UNLZO_H
 #define DECOMPRESS_UNLZO_H
 
-int unlzo(unsigned char *inbuf, int len,
-	int(*fill)(void*, unsigned int),
-	int(*flush)(void*, unsigned int),
+int unlzo(unsigned char *inbuf, long len,
+	long (*fill)(void*, unsigned long),
+	long (*flush)(void*, unsigned long),
 	unsigned char *output,
-	int *pos,
+	long *pos,
 	void(*error)(char *x));
 #endif
diff --git a/include/linux/decompress/unxz.h b/include/linux/decompress/unxz.h
index 41728fc6c8a1..f764e2a7201e 100644
--- a/include/linux/decompress/unxz.h
+++ b/include/linux/decompress/unxz.h
@@ -10,10 +10,10 @@
 #ifndef DECOMPRESS_UNXZ_H
 #define DECOMPRESS_UNXZ_H
 
-int unxz(unsigned char *in, int in_size,
-	 int (*fill)(void *dest, unsigned int size),
-	 int (*flush)(void *src, unsigned int size),
-	 unsigned char *out, int *in_used,
+int unxz(unsigned char *in, long in_size,
+	 long (*fill)(void *dest, unsigned long size),
+	 long (*flush)(void *src, unsigned long size),
+	 unsigned char *out, long *in_used,
 	 void (*error)(char *x));
 
 #endif