--- /dev/null
+From 6c4419d997d4431bb62e73475cd6b084e83efbd1 Mon Sep 17 00:00:00 2001
+From: Phillip Lougher <phillip@lougher.demon.co.uk>
+Date: Tue, 22 Sep 2009 19:25:24 +0100
+Subject: [PATCH] Squashfs: move zlib decompression wrapper code into a separate file
+
+Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
+---
+ fs/squashfs/Makefile | 2 +-
+ fs/squashfs/block.c | 74 ++----------------------------
+ fs/squashfs/squashfs.h | 4 ++
+ fs/squashfs/zlib_wrapper.c | 109 ++++++++++++++++++++++++++++++++++++++++++++
+ 4 files changed, 118 insertions(+), 71 deletions(-)
+ create mode 100644 fs/squashfs/zlib_wrapper.c
+
+--- a/fs/squashfs/Makefile
++++ b/fs/squashfs/Makefile
+@@ -4,4 +4,4 @@
+
+ obj-$(CONFIG_SQUASHFS) += squashfs.o
+ squashfs-y += block.o cache.o dir.o export.o file.o fragment.o id.o inode.o
+-squashfs-y += namei.o super.o symlink.o
++squashfs-y += namei.o super.o symlink.o zlib_wrapper.o
+--- a/fs/squashfs/block.c
++++ b/fs/squashfs/block.c
+@@ -29,7 +29,6 @@
+ #include <linux/fs.h>
+ #include <linux/vfs.h>
+ #include <linux/slab.h>
+-#include <linux/mutex.h>
+ #include <linux/string.h>
+ #include <linux/buffer_head.h>
+ #include <linux/zlib.h>
+@@ -153,72 +152,10 @@ int squashfs_read_data(struct super_bloc
+ }
+
+ if (compressed) {
+- int zlib_err = 0, zlib_init = 0;
+-
+- /*
+- * Uncompress block.
+- */
+-
+- mutex_lock(&msblk->read_data_mutex);
+-
+- msblk->stream.avail_out = 0;
+- msblk->stream.avail_in = 0;
+-
+- bytes = length;
+- do {
+- if (msblk->stream.avail_in == 0 && k < b) {
+- avail = min(bytes, msblk->devblksize - offset);
+- bytes -= avail;
+- wait_on_buffer(bh[k]);
+- if (!buffer_uptodate(bh[k]))
+- goto release_mutex;
+-
+- if (avail == 0) {
+- offset = 0;
+- put_bh(bh[k++]);
+- continue;
+- }
+-
+- msblk->stream.next_in = bh[k]->b_data + offset;
+- msblk->stream.avail_in = avail;
+- offset = 0;
+- }
+-
+- if (msblk->stream.avail_out == 0 && page < pages) {
+- msblk->stream.next_out = buffer[page++];
+- msblk->stream.avail_out = PAGE_CACHE_SIZE;
+- }
+-
+- if (!zlib_init) {
+- zlib_err = zlib_inflateInit(&msblk->stream);
+- if (zlib_err != Z_OK) {
+- ERROR("zlib_inflateInit returned"
+- " unexpected result 0x%x,"
+- " srclength %d\n", zlib_err,
+- srclength);
+- goto release_mutex;
+- }
+- zlib_init = 1;
+- }
+-
+- zlib_err = zlib_inflate(&msblk->stream, Z_SYNC_FLUSH);
+-
+- if (msblk->stream.avail_in == 0 && k < b)
+- put_bh(bh[k++]);
+- } while (zlib_err == Z_OK);
+-
+- if (zlib_err != Z_STREAM_END) {
+- ERROR("zlib_inflate error, data probably corrupt\n");
+- goto release_mutex;
+- }
+-
+- zlib_err = zlib_inflateEnd(&msblk->stream);
+- if (zlib_err != Z_OK) {
+- ERROR("zlib_inflate error, data probably corrupt\n");
+- goto release_mutex;
+- }
+- length = msblk->stream.total_out;
+- mutex_unlock(&msblk->read_data_mutex);
++ length = zlib_uncompress(msblk, buffer, bh, b, offset, length,
++ srclength, pages);
++ if (length < 0)
++ goto read_failure;
+ } else {
+ /*
+ * Block is uncompressed.
+@@ -255,9 +192,6 @@ int squashfs_read_data(struct super_bloc
+ kfree(bh);
+ return length;
+
+-release_mutex:
+- mutex_unlock(&msblk->read_data_mutex);
+-
+ block_release:
+ for (; k < b; k++)
+ put_bh(bh[k]);
+--- a/fs/squashfs/squashfs.h
++++ b/fs/squashfs/squashfs.h
+@@ -70,6 +70,10 @@ extern struct inode *squashfs_iget(struc
+ unsigned int);
+ extern int squashfs_read_inode(struct inode *, long long);
+
++/* zlib_wrapper.c */
++extern int zlib_uncompress(struct squashfs_sb_info *, void **,
++ struct buffer_head **, int, int, int, int, int);
++
+ /*
+ * Inodes and files operations
+ */
+--- /dev/null
++++ b/fs/squashfs/zlib_wrapper.c
+@@ -0,0 +1,109 @@
++/*
++ * Squashfs - a compressed read only filesystem for Linux
++ *
++ * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
++ * Phillip Lougher <phillip@lougher.demon.co.uk>
++ *
++ * This program is free software; you can redistribute it and/or
++ * modify it under the terms of the GNU General Public License
++ * as published by the Free Software Foundation; either version 2,
++ * or (at your option) any later version.
++ *
++ * This program is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++ * GNU General Public License for more details.
++ *
++ * You should have received a copy of the GNU General Public License
++ * along with this program; if not, write to the Free Software
++ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
++ *
++ * zlib_wrapper.c
++ */
++
++
++#include <linux/mutex.h>
++#include <linux/buffer_head.h>
++#include <linux/zlib.h>
++
++#include "squashfs_fs.h"
++#include "squashfs_fs_sb.h"
++#include "squashfs_fs_i.h"
++#include "squashfs.h"
++
++int zlib_uncompress(struct squashfs_sb_info *msblk, void **buffer,
++ struct buffer_head **bh, int b, int offset, int length, int srclength,
++ int pages)
++{
++ int zlib_err = 0, zlib_init = 0;
++ int avail, bytes, k = 0, page = 0;
++
++ mutex_lock(&msblk->read_data_mutex);
++
++ msblk->stream.avail_out = 0;
++ msblk->stream.avail_in = 0;
++
++ bytes = length;
++ do {
++ if (msblk->stream.avail_in == 0 && k < b) {
++ avail = min(bytes, msblk->devblksize - offset);
++ bytes -= avail;
++ wait_on_buffer(bh[k]);
++ if (!buffer_uptodate(bh[k]))
++ goto release_mutex;
++
++ if (avail == 0) {
++ offset = 0;
++ put_bh(bh[k++]);
++ continue;
++ }
++
++ msblk->stream.next_in = bh[k]->b_data + offset;
++ msblk->stream.avail_in = avail;
++ offset = 0;
++ }
++
++ if (msblk->stream.avail_out == 0 && page < pages) {
++ msblk->stream.next_out = buffer[page++];
++ msblk->stream.avail_out = PAGE_CACHE_SIZE;
++ }
++
++ if (!zlib_init) {
++ zlib_err = zlib_inflateInit(&msblk->stream);
++ if (zlib_err != Z_OK) {
++ ERROR("zlib_inflateInit returned unexpected "
++ "result 0x%x, srclength %d\n",
++ zlib_err, srclength);
++ goto release_mutex;
++ }
++ zlib_init = 1;
++ }
++
++ zlib_err = zlib_inflate(&msblk->stream, Z_SYNC_FLUSH);
++
++ if (msblk->stream.avail_in == 0 && k < b)
++ put_bh(bh[k++]);
++ } while (zlib_err == Z_OK);
++
++ if (zlib_err != Z_STREAM_END) {
++ ERROR("zlib_inflate error, data probably corrupt\n");
++ goto release_mutex;
++ }
++
++ zlib_err = zlib_inflateEnd(&msblk->stream);
++ if (zlib_err != Z_OK) {
++ ERROR("zlib_inflate error, data probably corrupt\n");
++ goto release_mutex;
++ }
++
++ mutex_unlock(&msblk->read_data_mutex);
++ return msblk->stream.total_out;
++
++release_mutex:
++ mutex_unlock(&msblk->read_data_mutex);
++
++ for (; k < b; k++)
++ put_bh(bh[k]);
++
++ return -EIO;
++}
projects / openwrt / openwrt.git / blobdiff