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Date: Tue, 17 Mar 2009 13:44:58 +0100 (CET)
From: Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
To: Herbert Xu <herbert@...dor.apana.org.au>
cc: linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
Phillip Lougher <phillip@...gher.demon.co.uk>
Subject: Re: [PATCH 6/6] squashfs: Make SquashFS 4 use the new pcomp crypto
interface
On Wed, 25 Feb 2009, Geert Uytterhoeven wrote:
> Modify SquashFS 4 to use the new "pcomp" crypto interface for decompression,
> instead of calling the underlying zlib library directly. This simplifies e.g.
> the addition of support for hardware decompression and different decompression
> algorithms.
This is an updated patch, to accomodate for the recent changes in SquashFS.
---
>From 46b8e0ab105e9b414d455c0a7205a7c79f0517e8 Mon Sep 17 00:00:00 2001
From: Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
Date: Thu, 18 Dec 2008 14:35:22 +0100
Subject: [PATCH] squashfs: Make SquashFS 4 use the new pcomp crypto interface
Modify SquashFS 4 to use the new "pcomp" crypto interface for decompression,
instead of calling the underlying zlib library directly. This simplifies e.g.
the addition of support for hardware decompression and different decompression
algorithms.
Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
Cc: Phillip Lougher <phillip@...gher.demon.co.uk>
---
fs/squashfs/Kconfig | 3 +-
fs/squashfs/block.c | 70 ++++++++++++++++++++++++-----------------
fs/squashfs/squashfs_fs_sb.h | 2 +-
fs/squashfs/super.c | 44 +++++++++++++++++++++-----
4 files changed, 80 insertions(+), 39 deletions(-)
diff --git a/fs/squashfs/Kconfig b/fs/squashfs/Kconfig
index 25a00d1..18e33a6 100644
--- a/fs/squashfs/Kconfig
+++ b/fs/squashfs/Kconfig
@@ -1,7 +1,8 @@
config SQUASHFS
tristate "SquashFS 4.0 - Squashed file system support"
depends on BLOCK
- select ZLIB_INFLATE
+ select CRYPTO
+ select CRYPTO_ZLIB
help
Saying Y here includes support for SquashFS 4.0 (a Compressed
Read-Only File System). Squashfs is a highly compressed read-only
diff --git a/fs/squashfs/block.c b/fs/squashfs/block.c
index 2a79603..6196821 100644
--- a/fs/squashfs/block.c
+++ b/fs/squashfs/block.c
@@ -32,7 +32,8 @@
#include <linux/mutex.h>
#include <linux/string.h>
#include <linux/buffer_head.h>
-#include <linux/zlib.h>
+
+#include <crypto/compress.h>
#include "squashfs_fs.h"
#include "squashfs_fs_sb.h"
@@ -153,7 +154,9 @@ int squashfs_read_data(struct super_block *sb, void **buffer, u64 index,
}
if (compressed) {
- int zlib_err = 0, zlib_init = 0;
+ int error = 0, decomp_init = 0;
+ struct comp_request req;
+ unsigned int produced = 0;
/*
* Uncompress block.
@@ -161,12 +164,13 @@ int squashfs_read_data(struct super_block *sb, void **buffer, u64 index,
mutex_lock(&msblk->read_data_mutex);
- msblk->stream.avail_out = 0;
- msblk->stream.avail_in = 0;
+ req.avail_out = 0;
+ req.avail_in = 0;
bytes = length;
+ length = 0;
do {
- if (msblk->stream.avail_in == 0 && k < b) {
+ if (req.avail_in == 0 && k < b) {
avail = min(bytes, msblk->devblksize - offset);
bytes -= avail;
wait_on_buffer(bh[k]);
@@ -179,45 +183,53 @@ int squashfs_read_data(struct super_block *sb, void **buffer, u64 index,
continue;
}
- msblk->stream.next_in = bh[k]->b_data + offset;
- msblk->stream.avail_in = avail;
+ req.next_in = bh[k]->b_data + offset;
+ req.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 (req.avail_out == 0 && page < pages) {
+ req.next_out = buffer[page++];
+ req.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);
+ if (!decomp_init) {
+ error = crypto_decompress_init(msblk->tfm);
+ if (error) {
+ ERROR("crypto_decompress_init "
+ "returned %d, srclength %d\n",
+ error, srclength);
goto release_mutex;
}
- zlib_init = 1;
+ decomp_init = 1;
+ }
+
+ produced = req.avail_out;
+ error = crypto_decompress_update(msblk->tfm, &req);
+ if (error) {
+ ERROR("crypto_decompress_update returned %d, "
+ "data probably corrupt\n", error);
+ goto release_mutex;
}
+ produced -= req.avail_out;
- zlib_err = zlib_inflate(&msblk->stream, Z_SYNC_FLUSH);
+ length += produced;
- if (msblk->stream.avail_in == 0 && k < b)
+ if (req.avail_in == 0 && k < b)
put_bh(bh[k++]);
- } while (zlib_err == Z_OK);
+ } while (bytes || produced);
- if (zlib_err != Z_STREAM_END) {
- ERROR("zlib_inflate error, data probably corrupt\n");
+ produced = req.avail_out;
+ error = crypto_decompress_final(msblk->tfm, &req);
+ if (error) {
+ ERROR("crypto_decompress_final returned %d, data "
+ "probably corrupt\n", error);
goto release_mutex;
}
+ produced -= req.avail_out;
+
+ length += produced;
- 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);
} else {
/*
diff --git a/fs/squashfs/squashfs_fs_sb.h b/fs/squashfs/squashfs_fs_sb.h
index c8c6561..4eae75b 100644
--- a/fs/squashfs/squashfs_fs_sb.h
+++ b/fs/squashfs/squashfs_fs_sb.h
@@ -64,7 +64,7 @@ struct squashfs_sb_info {
struct mutex read_data_mutex;
struct mutex meta_index_mutex;
struct meta_index *meta_index;
- z_stream stream;
+ struct crypto_pcomp *tfm;
__le64 *inode_lookup_table;
u64 inode_table;
u64 directory_table;
diff --git a/fs/squashfs/super.c b/fs/squashfs/super.c
index 681ec0d..2b63f54 100644
--- a/fs/squashfs/super.c
+++ b/fs/squashfs/super.c
@@ -37,11 +37,19 @@
#include <linux/zlib.h>
#include <linux/magic.h>
+#include <crypto/compress.h>
+
+#include <net/netlink.h>
+
#include "squashfs_fs.h"
#include "squashfs_fs_sb.h"
#include "squashfs_fs_i.h"
#include "squashfs.h"
+
+#define SQUASHFS_CRYPTO_ALG "zlib"
+
+
static struct file_system_type squashfs_fs_type;
static struct super_operations squashfs_super_ops;
@@ -75,6 +83,16 @@ static int squashfs_fill_super(struct super_block *sb, void *data, int silent)
unsigned short flags;
unsigned int fragments;
u64 lookup_table_start;
+ struct {
+ struct nlattr nla;
+ int val;
+ } params = {
+ .nla = {
+ .nla_len = nla_attr_size(sizeof(int)),
+ .nla_type = ZLIB_DECOMP_WINDOWBITS,
+ },
+ .val = DEF_WBITS,
+ };
int err;
TRACE("Entered squashfs_fill_superblock\n");
@@ -86,16 +104,25 @@ static int squashfs_fill_super(struct super_block *sb, void *data, int silent)
}
msblk = sb->s_fs_info;
- msblk->stream.workspace = kmalloc(zlib_inflate_workspacesize(),
- GFP_KERNEL);
- if (msblk->stream.workspace == NULL) {
- ERROR("Failed to allocate zlib workspace\n");
+ msblk->tfm = crypto_alloc_pcomp(SQUASHFS_CRYPTO_ALG, 0,
+ CRYPTO_ALG_ASYNC);
+ if (IS_ERR(msblk->tfm)) {
+ ERROR("Failed to load %s crypto module\n",
+ SQUASHFS_CRYPTO_ALG);
+ err = PTR_ERR(msblk->tfm);
+ goto failed_pcomp;
+ }
+
+ err = crypto_decompress_setup(msblk->tfm, ¶ms, sizeof(params));
+ if (err) {
+ ERROR("Failed to set up decompression parameters\n");
goto failure;
}
sblk = kzalloc(sizeof(*sblk), GFP_KERNEL);
if (sblk == NULL) {
ERROR("Failed to allocate squashfs_super_block\n");
+ err = -ENOMEM;
goto failure;
}
@@ -284,17 +311,18 @@ failed_mount:
kfree(msblk->inode_lookup_table);
kfree(msblk->fragment_index);
kfree(msblk->id_table);
- kfree(msblk->stream.workspace);
+ crypto_free_pcomp(msblk->tfm);
kfree(sb->s_fs_info);
sb->s_fs_info = NULL;
kfree(sblk);
return err;
failure:
- kfree(msblk->stream.workspace);
+ crypto_free_pcomp(msblk->tfm);
+failed_pcomp:
kfree(sb->s_fs_info);
sb->s_fs_info = NULL;
- return -ENOMEM;
+ return err;
}
@@ -333,7 +361,7 @@ static void squashfs_put_super(struct super_block *sb)
kfree(sbi->id_table);
kfree(sbi->fragment_index);
kfree(sbi->meta_index);
- kfree(sbi->stream.workspace);
+ crypto_free_pcomp(sbi->tfm);
kfree(sb->s_fs_info);
sb->s_fs_info = NULL;
}
--
1.6.0.4
With kind regards,
Geert Uytterhoeven
Software Architect
Sony Techsoft Centre Europe
The Corporate Village · Da Vincilaan 7-D1 · B-1935 Zaventem · Belgium
Phone: +32 (0)2 700 8453
Fax: +32 (0)2 700 8622
E-mail: Geert.Uytterhoeven@...ycom.com
Internet: http://www.sony-europe.com/
A division of Sony Europe (Belgium) N.V.
VAT BE 0413.825.160 · RPR Brussels
Fortis · BIC GEBABEBB · IBAN BE41293037680010
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