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|
--- 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
--- 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 +154,8 @@ int squashfs_read_data(struct super_bloc
}
if (compressed) {
- int zlib_err = 0, zlib_init = 0;
+ int res = 0, decomp_init = 0;
+ struct comp_request req;
/*
* Uncompress block.
@@ -161,12 +163,13 @@ int squashfs_read_data(struct super_bloc
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 +182,47 @@ int squashfs_read_data(struct super_bloc
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) {
+ res = crypto_decompress_init(msblk->tfm);
+ if (res) {
+ ERROR("crypto_decompress_init "
+ "returned %d, srclength %d\n",
+ res, srclength);
goto release_mutex;
}
- zlib_init = 1;
+ decomp_init = 1;
}
- zlib_err = zlib_inflate(&msblk->stream, Z_SYNC_FLUSH);
+ res = crypto_decompress_update(msblk->tfm, &req);
+ if (res < 0) {
+ ERROR("crypto_decompress_update returned %d, "
+ "data probably corrupt\n", res);
+ goto release_mutex;
+ }
+ length += res;
- 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 || res);
- if (zlib_err != Z_STREAM_END) {
- ERROR("zlib_inflate error, data probably corrupt\n");
+ res = crypto_decompress_final(msblk->tfm, &req);
+ if (res < 0) {
+ ERROR("crypto_decompress_final returned %d, data "
+ "probably corrupt\n", res);
goto release_mutex;
}
+ length += res;
- 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 {
/*
--- 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;
--- 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 su
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 su
}
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;
}
@@ -294,17 +321,18 @@ 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;
}
@@ -346,7 +374,7 @@ static void squashfs_put_super(struct su
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;
}
|
