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Merge git://git.kernel.org/pub/scm/linux/kernel/git/pkl/squashfs-linus

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* git://git.kernel.org/pub/scm/linux/kernel/git/pkl/squashfs-linus:
  Squashfs: fix checkpatch.pl warnings
  Squashfs: fix filename typo
  Squashfs: update Kconfig and documentation for LZO
  Squashfs: fix block size use in LZO decompressor
  Squashfs: Add LZO compression support
  squashfs: fix filename in header comment
  Squashfs: Make XATTR config name consistent with other file systems
  squashfs: fix compiler inline warning
This commit is contained in:
Linus Torvalds 2010-08-11 09:20:13 -07:00
commit 062e27ec1b
9 changed files with 181 additions and 21 deletions
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2
Documentation/filesystems/squashfs.txt
View File

@ -2,7 +2,7 @@ SQUASHFS 4.0 FILESYSTEM
=======================
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).

25
fs/squashfs/Kconfig
View File

@ -5,13 +5,13 @@ config SQUASHFS
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
@ -26,7 +26,7 @@ config SQUASHFS
If unsure, say N.
config SQUASHFS_XATTRS
config SQUASHFS_XATTR
bool "Squashfs XATTR support"
depends on SQUASHFS
default n
@ -37,9 +37,24 @@ config SQUASHFS_XATTRS
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

4
fs/squashfs/Makefile
View File

@ -5,5 +5,5 @@
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

6
fs/squashfs/decompressor.c
View File

@ -40,9 +40,11 @@ static const struct squashfs_decompressor squashfs_lzma_unsupported_comp_ops = {
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
@ -51,7 +53,11 @@ static const struct squashfs_decompressor squashfs_unknown_comp_ops = {
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
};

136
fs/squashfs/lzo_wrapper.c Normal file
View File

@ -0,0 +1,136 @@
/*
* 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
};

3
fs/squashfs/squashfs.h
View File

@ -104,3 +104,6 @@ extern const struct xattr_handler *squashfs_xattr_handlers[];
/* zlib_wrapper.c */
extern const struct squashfs_decompressor squashfs_zlib_comp_ops;
/* lzo_wrapper.c */
extern const struct squashfs_decompressor squashfs_lzo_comp_ops;

20
fs/squashfs/squashfs_fs.h
View File

@ -274,7 +274,7 @@ struct squashfs_base_inode {
__le16 uid;
__le16 guid;
__le32 mtime;
__le32 inode_number;
__le32 inode_number;
};
struct squashfs_ipc_inode {
@ -283,7 +283,7 @@ struct squashfs_ipc_inode {
__le16 uid;
__le16 guid;
__le32 mtime;
__le32 inode_number;
__le32 inode_number;
__le32 nlink;
};
@ -293,7 +293,7 @@ struct squashfs_lipc_inode {
__le16 uid;
__le16 guid;
__le32 mtime;
__le32 inode_number;
__le32 inode_number;
__le32 nlink;
__le32 xattr;
};
@ -304,7 +304,7 @@ struct squashfs_dev_inode {
__le16 uid;
__le16 guid;
__le32 mtime;
__le32 inode_number;
__le32 inode_number;
__le32 nlink;
__le32 rdev;
};
@ -315,7 +315,7 @@ struct squashfs_ldev_inode {
__le16 uid;
__le16 guid;
__le32 mtime;
__le32 inode_number;
__le32 inode_number;
__le32 nlink;
__le32 rdev;
__le32 xattr;
@ -327,7 +327,7 @@ struct squashfs_symlink_inode {
__le16 uid;
__le16 guid;
__le32 mtime;
__le32 inode_number;
__le32 inode_number;
__le32 nlink;
__le32 symlink_size;
char symlink[0];
@ -339,7 +339,7 @@ struct squashfs_reg_inode {
__le16 uid;
__le16 guid;
__le32 mtime;
__le32 inode_number;
__le32 inode_number;
__le32 start_block;
__le32 fragment;
__le32 offset;
@ -353,7 +353,7 @@ struct squashfs_lreg_inode {
__le16 uid;
__le16 guid;
__le32 mtime;
__le32 inode_number;
__le32 inode_number;
__le64 start_block;
__le64 file_size;
__le64 sparse;
@ -370,7 +370,7 @@ struct squashfs_dir_inode {
__le16 uid;
__le16 guid;
__le32 mtime;
__le32 inode_number;
__le32 inode_number;
__le32 start_block;
__le32 nlink;
__le16 file_size;
@ -384,7 +384,7 @@ struct squashfs_ldir_inode {
__le16 uid;
__le16 guid;
__le32 mtime;
__le32 inode_number;
__le32 inode_number;
__le32 nlink;
__le32 file_size;
__le32 start_block;

4
fs/squashfs/xattr.c
View File

@ -18,7 +18,7 @@
* 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>
@ -295,7 +295,7 @@ static const struct xattr_handler squashfs_xattr_security_handler = {
.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 */

2
fs/squashfs/xattr.h
View File

@ -21,7 +21,7 @@
* 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 *,