=======================
Squashfs is a compressed read-only filesystem for Linux.
-It uses zlib compression to compress files, inodes and directories.
+It uses zlib/lzo compression to compress files, inodes and directories.
Inodes in the system are very small and all blocks are packed to minimise
data overhead. Block sizes greater than 4K are supported up to a maximum
of 1Mbytes (default block size 128K).
help
Saying Y here includes support for SquashFS 4.0 (a Compressed
Read-Only File System). Squashfs is a highly compressed read-only
- filesystem for Linux. It uses zlib compression to compress both
+ filesystem for Linux. It uses zlib/lzo compression to compress both
files, inodes and directories. Inodes in the system are very small
and all blocks are packed to minimise data overhead. Block sizes
greater than 4K are supported up to a maximum of 1 Mbytes (default
block size 128K). SquashFS 4.0 supports 64 bit filesystems and files
(larger than 4GB), full uid/gid information, hard links and
- timestamps.
+ timestamps.
Squashfs is intended for general read-only filesystem use, for
archival use (i.e. in cases where a .tar.gz file may be used), and in
If unsure, say N.
-config SQUASHFS_XATTRS
+config SQUASHFS_XATTR
bool "Squashfs XATTR support"
depends on SQUASHFS
default n
If unsure, say N.
-config SQUASHFS_EMBEDDED
+config SQUASHFS_LZO
+ bool "Include support for LZO compressed file systems"
+ depends on SQUASHFS
+ default n
+ select LZO_DECOMPRESS
+ help
+ Saying Y here includes support for reading Squashfs file systems
+ compressed with LZO compresssion. LZO compression is mainly
+ aimed at embedded systems with slower CPUs where the overheads
+ of zlib are too high.
- bool "Additional option for memory-constrained systems"
+ LZO is not the standard compression used in Squashfs and so most
+ file systems will be readable without selecting this option.
+
+ If unsure, say N.
+
+config SQUASHFS_EMBEDDED
+ bool "Additional option for memory-constrained systems"
depends on SQUASHFS
default n
help
obj-$(CONFIG_SQUASHFS) += squashfs.o
squashfs-y += block.o cache.o dir.o export.o file.o fragment.o id.o inode.o
squashfs-y += namei.o super.o symlink.o zlib_wrapper.o decompressor.o
-squashfs-$(CONFIG_SQUASHFS_XATTRS) += xattr.o xattr_id.o
-
+squashfs-$(CONFIG_SQUASHFS_XATTR) += xattr.o xattr_id.o
+squashfs-$(CONFIG_SQUASHFS_LZO) += lzo_wrapper.o
NULL, NULL, NULL, LZMA_COMPRESSION, "lzma", 0
};
+#ifndef CONFIG_SQUASHFS_LZO
static const struct squashfs_decompressor squashfs_lzo_unsupported_comp_ops = {
NULL, NULL, NULL, LZO_COMPRESSION, "lzo", 0
};
+#endif
static const struct squashfs_decompressor squashfs_unknown_comp_ops = {
NULL, NULL, NULL, 0, "unknown", 0
static const struct squashfs_decompressor *decompressor[] = {
&squashfs_zlib_comp_ops,
&squashfs_lzma_unsupported_comp_ops,
+#ifdef CONFIG_SQUASHFS_LZO
+ &squashfs_lzo_comp_ops,
+#else
&squashfs_lzo_unsupported_comp_ops,
+#endif
&squashfs_unknown_comp_ops
};
--- /dev/null
+/*
+ * Squashfs - a compressed read only filesystem for Linux
+ *
+ * Copyright (c) 2010 LG Electronics
+ * Chan Jeong <chan.jeong@lge.com>
+ *
+ * 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.
+ *
+ * lzo_wrapper.c
+ */
+
+#include <linux/mutex.h>
+#include <linux/buffer_head.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/lzo.h>
+
+#include "squashfs_fs.h"
+#include "squashfs_fs_sb.h"
+#include "squashfs_fs_i.h"
+#include "squashfs.h"
+#include "decompressor.h"
+
+struct squashfs_lzo {
+ void *input;
+ void *output;
+};
+
+static void *lzo_init(struct squashfs_sb_info *msblk)
+{
+ int block_size = max_t(int, msblk->block_size, SQUASHFS_METADATA_SIZE);
+
+ struct squashfs_lzo *stream = kzalloc(sizeof(*stream), GFP_KERNEL);
+ if (stream == NULL)
+ goto failed;
+ stream->input = vmalloc(block_size);
+ if (stream->input == NULL)
+ goto failed;
+ stream->output = vmalloc(block_size);
+ if (stream->output == NULL)
+ goto failed2;
+
+ return stream;
+
+failed2:
+ vfree(stream->input);
+failed:
+ ERROR("Failed to allocate lzo workspace\n");
+ kfree(stream);
+ return NULL;
+}
+
+
+static void lzo_free(void *strm)
+{
+ struct squashfs_lzo *stream = strm;
+
+ if (stream) {
+ vfree(stream->input);
+ vfree(stream->output);
+ }
+ kfree(stream);
+}
+
+
+static int lzo_uncompress(struct squashfs_sb_info *msblk, void **buffer,
+ struct buffer_head **bh, int b, int offset, int length, int srclength,
+ int pages)
+{
+ struct squashfs_lzo *stream = msblk->stream;
+ void *buff = stream->input;
+ int avail, i, bytes = length, res;
+ size_t out_len = srclength;
+
+ mutex_lock(&msblk->read_data_mutex);
+
+ for (i = 0; i < b; i++) {
+ wait_on_buffer(bh[i]);
+ if (!buffer_uptodate(bh[i]))
+ goto block_release;
+
+ avail = min(bytes, msblk->devblksize - offset);
+ memcpy(buff, bh[i]->b_data + offset, avail);
+ buff += avail;
+ bytes -= avail;
+ offset = 0;
+ put_bh(bh[i]);
+ }
+
+ res = lzo1x_decompress_safe(stream->input, (size_t)length,
+ stream->output, &out_len);
+ if (res != LZO_E_OK)
+ goto failed;
+
+ res = bytes = (int)out_len;
+ for (i = 0, buff = stream->output; bytes && i < pages; i++) {
+ avail = min_t(int, bytes, PAGE_CACHE_SIZE);
+ memcpy(buffer[i], buff, avail);
+ buff += avail;
+ bytes -= avail;
+ }
+
+ mutex_unlock(&msblk->read_data_mutex);
+ return res;
+
+block_release:
+ for (; i < b; i++)
+ put_bh(bh[i]);
+
+failed:
+ mutex_unlock(&msblk->read_data_mutex);
+
+ ERROR("lzo decompression failed, data probably corrupt\n");
+ return -EIO;
+}
+
+const struct squashfs_decompressor squashfs_lzo_comp_ops = {
+ .init = lzo_init,
+ .free = lzo_free,
+ .decompress = lzo_uncompress,
+ .id = LZO_COMPRESSION,
+ .name = "lzo",
+ .supported = 1
+};
/* zlib_wrapper.c */
extern const struct squashfs_decompressor squashfs_zlib_comp_ops;
+
+/* lzo_wrapper.c */
+extern const struct squashfs_decompressor squashfs_lzo_comp_ops;
__le16 uid;
__le16 guid;
__le32 mtime;
- __le32 inode_number;
+ __le32 inode_number;
};
struct squashfs_ipc_inode {
__le16 uid;
__le16 guid;
__le32 mtime;
- __le32 inode_number;
+ __le32 inode_number;
__le32 nlink;
};
__le16 uid;
__le16 guid;
__le32 mtime;
- __le32 inode_number;
+ __le32 inode_number;
__le32 nlink;
__le32 xattr;
};
__le16 uid;
__le16 guid;
__le32 mtime;
- __le32 inode_number;
+ __le32 inode_number;
__le32 nlink;
__le32 rdev;
};
__le16 uid;
__le16 guid;
__le32 mtime;
- __le32 inode_number;
+ __le32 inode_number;
__le32 nlink;
__le32 rdev;
__le32 xattr;
__le16 uid;
__le16 guid;
__le32 mtime;
- __le32 inode_number;
+ __le32 inode_number;
__le32 nlink;
__le32 symlink_size;
char symlink[0];
__le16 uid;
__le16 guid;
__le32 mtime;
- __le32 inode_number;
+ __le32 inode_number;
__le32 start_block;
__le32 fragment;
__le32 offset;
__le16 uid;
__le16 guid;
__le32 mtime;
- __le32 inode_number;
+ __le32 inode_number;
__le64 start_block;
__le64 file_size;
__le64 sparse;
__le16 uid;
__le16 guid;
__le32 mtime;
- __le32 inode_number;
+ __le32 inode_number;
__le32 start_block;
__le32 nlink;
__le16 file_size;
__le16 uid;
__le16 guid;
__le32 mtime;
- __le32 inode_number;
+ __le32 inode_number;
__le32 nlink;
__le32 file_size;
__le32 start_block;
* along with this program; if not, write to the Free Software
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
- * xattr_id.c
+ * xattr.c
*/
#include <linux/init.h>
.get = squashfs_security_get
};
-static inline const struct xattr_handler *squashfs_xattr_handler(int type)
+static const struct xattr_handler *squashfs_xattr_handler(int type)
{
if (type & ~(SQUASHFS_XATTR_PREFIX_MASK | SQUASHFS_XATTR_VALUE_OOL))
/* ignore unrecognised type */
* xattr.h
*/
-#ifdef CONFIG_SQUASHFS_XATTRS
+#ifdef CONFIG_SQUASHFS_XATTR
extern __le64 *squashfs_read_xattr_id_table(struct super_block *, u64,
u64 *, int *);
extern int squashfs_xattr_lookup(struct super_block *, unsigned int, int *,
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