mirror of
git://git.openwrt.org/openwrt/openwrt.git
synced 2025-10-31 14:04:26 -04:00
245 lines
6.5 KiB
Diff
245 lines
6.5 KiB
Diff
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;
|
|
+}
|