diff options
Diffstat (limited to 'target/linux/generic-2.6/patches-2.6.32/003-squashfs_add_decompressor_framework.patch')
| -rw-r--r-- | target/linux/generic-2.6/patches-2.6.32/003-squashfs_add_decompressor_framework.patch | 426 |
1 files changed, 426 insertions, 0 deletions
diff --git a/target/linux/generic-2.6/patches-2.6.32/003-squashfs_add_decompressor_framework.patch b/target/linux/generic-2.6/patches-2.6.32/003-squashfs_add_decompressor_framework.patch new file mode 100644 index 000000000..fdf0d407a --- /dev/null +++ b/target/linux/generic-2.6/patches-2.6.32/003-squashfs_add_decompressor_framework.patch @@ -0,0 +1,426 @@ +From 327fbf47a419befc6bff74f3ca42d2b6f0841903 Mon Sep 17 00:00:00 2001 +From: Phillip Lougher <phillip@lougher.demon.co.uk> +Date: Tue, 6 Oct 2009 04:04:15 +0100 +Subject: [PATCH] Squashfs: add a decompressor framework + +This adds a decompressor framework which allows multiple compression +algorithms to be cleanly supported. + +Also update zlib wrapper and other code to use the new framework. + +Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk> +--- + fs/squashfs/Makefile | 2 +- + fs/squashfs/block.c | 6 ++-- + fs/squashfs/decompressor.c | 58 ++++++++++++++++++++++++++++++++++++++++++ + fs/squashfs/decompressor.h | 55 +++++++++++++++++++++++++++++++++++++++ + fs/squashfs/squashfs.h | 14 +++++----- + fs/squashfs/squashfs_fs_sb.h | 41 +++++++++++++++-------------- + fs/squashfs/super.c | 45 ++++++++++++++++++------------- + fs/squashfs/zlib_wrapper.c | 17 ++++++++++-- + 8 files changed, 185 insertions(+), 53 deletions(-) + create mode 100644 fs/squashfs/decompressor.c + create mode 100644 fs/squashfs/decompressor.h + +--- 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 zlib_wrapper.o ++squashfs-y += namei.o super.o symlink.o zlib_wrapper.o decompressor.o +--- a/fs/squashfs/block.c ++++ b/fs/squashfs/block.c +@@ -36,7 +36,7 @@ + #include "squashfs_fs_sb.h" + #include "squashfs_fs_i.h" + #include "squashfs.h" +- ++#include "decompressor.h" + /* + * Read the metadata block length, this is stored in the first two + * bytes of the metadata block. +@@ -151,8 +151,8 @@ int squashfs_read_data(struct super_bloc + } + + if (compressed) { +- length = zlib_uncompress(msblk, buffer, bh, b, offset, length, +- srclength, pages); ++ length = squashfs_decompress(msblk, buffer, bh, b, offset, ++ length, srclength, pages); + if (length < 0) + goto read_failure; + } else { +--- /dev/null ++++ b/fs/squashfs/decompressor.c +@@ -0,0 +1,58 @@ ++/* ++ * 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. ++ * ++ * decompressor.c ++ */ ++ ++#include <linux/types.h> ++#include <linux/mutex.h> ++#include <linux/buffer_head.h> ++ ++#include "squashfs_fs.h" ++#include "squashfs_fs_sb.h" ++#include "squashfs_fs_i.h" ++#include "decompressor.h" ++#include "squashfs.h" ++ ++/* ++ * This file (and decompressor.h) implements a decompressor framework for ++ * Squashfs, allowing multiple decompressors to be easily supported ++ */ ++ ++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_unknown_comp_ops ++}; ++ ++ ++const struct squashfs_decompressor *squashfs_lookup_decompressor(int id) ++{ ++ int i; ++ ++ for (i = 0; decompressor[i]->id; i++) ++ if (id == decompressor[i]->id) ++ break; ++ ++ return decompressor[i]; ++} +--- /dev/null ++++ b/fs/squashfs/decompressor.h +@@ -0,0 +1,55 @@ ++#ifndef DECOMPRESSOR_H ++#define DECOMPRESSOR_H ++/* ++ * 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. ++ * ++ * decompressor.h ++ */ ++ ++struct squashfs_decompressor { ++ void *(*init)(void); ++ void (*free)(void *); ++ int (*decompress)(struct squashfs_sb_info *, void **, ++ struct buffer_head **, int, int, int, int, int); ++ int id; ++ char *name; ++ int supported; ++}; ++ ++static inline void *squashfs_decompressor_init(struct squashfs_sb_info *msblk) ++{ ++ return msblk->decompressor->init(); ++} ++ ++static inline void squashfs_decompressor_free(struct squashfs_sb_info *msblk, ++ void *s) ++{ ++ if (msblk->decompressor) ++ msblk->decompressor->free(s); ++} ++ ++static inline int squashfs_decompress(struct squashfs_sb_info *msblk, ++ void **buffer, struct buffer_head **bh, int b, int offset, int length, ++ int srclength, int pages) ++{ ++ return msblk->decompressor->decompress(msblk, buffer, bh, b, offset, ++ length, srclength, pages); ++} ++#endif +--- a/fs/squashfs/squashfs.h ++++ b/fs/squashfs/squashfs.h +@@ -51,6 +51,9 @@ extern struct squashfs_cache_entry *squa + u64, int); + extern int squashfs_read_table(struct super_block *, void *, u64, int); + ++/* decompressor.c */ ++extern const struct squashfs_decompressor *squashfs_lookup_decompressor(int); ++ + /* export.c */ + extern __le64 *squashfs_read_inode_lookup_table(struct super_block *, u64, + unsigned int); +@@ -70,14 +73,8 @@ extern struct inode *squashfs_iget(struc + unsigned int); + extern int squashfs_read_inode(struct inode *, long long); + +-/* zlib_wrapper.c */ +-extern void *zlib_init(void); +-extern void zlib_free(void *); +-extern int zlib_uncompress(struct squashfs_sb_info *, void **, +- struct buffer_head **, int, int, int, int, int); +- + /* +- * Inodes and files operations ++ * Inodes, files and decompressor operations + */ + + /* dir.c */ +@@ -94,3 +91,6 @@ extern const struct inode_operations squ + + /* symlink.c */ + extern const struct address_space_operations squashfs_symlink_aops; ++ ++/* zlib_wrapper.c */ ++extern const struct squashfs_decompressor squashfs_zlib_comp_ops; +--- a/fs/squashfs/squashfs_fs_sb.h ++++ b/fs/squashfs/squashfs_fs_sb.h +@@ -52,25 +52,26 @@ struct squashfs_cache_entry { + }; + + struct squashfs_sb_info { +- int devblksize; +- int devblksize_log2; +- struct squashfs_cache *block_cache; +- struct squashfs_cache *fragment_cache; +- struct squashfs_cache *read_page; +- int next_meta_index; +- __le64 *id_table; +- __le64 *fragment_index; +- unsigned int *fragment_index_2; +- struct mutex read_data_mutex; +- struct mutex meta_index_mutex; +- struct meta_index *meta_index; +- void *stream; +- __le64 *inode_lookup_table; +- u64 inode_table; +- u64 directory_table; +- unsigned int block_size; +- unsigned short block_log; +- long long bytes_used; +- unsigned int inodes; ++ const struct squashfs_decompressor *decompressor; ++ int devblksize; ++ int devblksize_log2; ++ struct squashfs_cache *block_cache; ++ struct squashfs_cache *fragment_cache; ++ struct squashfs_cache *read_page; ++ int next_meta_index; ++ __le64 *id_table; ++ __le64 *fragment_index; ++ unsigned int *fragment_index_2; ++ struct mutex read_data_mutex; ++ struct mutex meta_index_mutex; ++ struct meta_index *meta_index; ++ void *stream; ++ __le64 *inode_lookup_table; ++ u64 inode_table; ++ u64 directory_table; ++ unsigned int block_size; ++ unsigned short block_log; ++ long long bytes_used; ++ unsigned int inodes; + }; + #endif +--- a/fs/squashfs/super.c ++++ b/fs/squashfs/super.c +@@ -41,27 +41,35 @@ + #include "squashfs_fs_sb.h" + #include "squashfs_fs_i.h" + #include "squashfs.h" ++#include "decompressor.h" + + static struct file_system_type squashfs_fs_type; + static const struct super_operations squashfs_super_ops; + +-static int supported_squashfs_filesystem(short major, short minor, short comp) ++static const struct squashfs_decompressor *supported_squashfs_filesystem(short ++ major, short minor, short id) + { ++ const struct squashfs_decompressor *decompressor; ++ + if (major < SQUASHFS_MAJOR) { + ERROR("Major/Minor mismatch, older Squashfs %d.%d " + "filesystems are unsupported\n", major, minor); +- return -EINVAL; ++ return NULL; + } else if (major > SQUASHFS_MAJOR || minor > SQUASHFS_MINOR) { + ERROR("Major/Minor mismatch, trying to mount newer " + "%d.%d filesystem\n", major, minor); + ERROR("Please update your kernel\n"); +- return -EINVAL; ++ return NULL; + } + +- if (comp != ZLIB_COMPRESSION) +- return -EINVAL; ++ decompressor = squashfs_lookup_decompressor(id); ++ if (!decompressor->supported) { ++ ERROR("Filesystem uses \"%s\" compression. This is not " ++ "supported\n", decompressor->name); ++ return NULL; ++ } + +- return 0; ++ return decompressor; + } + + +@@ -86,10 +94,6 @@ static int squashfs_fill_super(struct su + } + msblk = sb->s_fs_info; + +- msblk->stream = zlib_init(); +- if (msblk->stream == NULL) +- goto failure; +- + sblk = kzalloc(sizeof(*sblk), GFP_KERNEL); + if (sblk == NULL) { + ERROR("Failed to allocate squashfs_super_block\n"); +@@ -116,25 +120,25 @@ static int squashfs_fill_super(struct su + goto failed_mount; + } + ++ err = -EINVAL; ++ + /* Check it is a SQUASHFS superblock */ + sb->s_magic = le32_to_cpu(sblk->s_magic); + if (sb->s_magic != SQUASHFS_MAGIC) { + if (!silent) + ERROR("Can't find a SQUASHFS superblock on %s\n", + bdevname(sb->s_bdev, b)); +- err = -EINVAL; + goto failed_mount; + } + +- /* Check the MAJOR & MINOR versions and compression type */ +- err = supported_squashfs_filesystem(le16_to_cpu(sblk->s_major), ++ /* Check the MAJOR & MINOR versions and lookup compression type */ ++ msblk->decompressor = supported_squashfs_filesystem( ++ le16_to_cpu(sblk->s_major), + le16_to_cpu(sblk->s_minor), + le16_to_cpu(sblk->compression)); +- if (err < 0) ++ if (msblk->decompressor == NULL) + goto failed_mount; + +- err = -EINVAL; +- + /* + * Check if there's xattrs in the filesystem. These are not + * supported in this version, so warn that they will be ignored. +@@ -201,6 +205,10 @@ static int squashfs_fill_super(struct su + + err = -ENOMEM; + ++ msblk->stream = squashfs_decompressor_init(msblk); ++ if (msblk->stream == NULL) ++ goto failed_mount; ++ + msblk->block_cache = squashfs_cache_init("metadata", + SQUASHFS_CACHED_BLKS, SQUASHFS_METADATA_SIZE); + if (msblk->block_cache == NULL) +@@ -288,7 +296,7 @@ failed_mount: + squashfs_cache_delete(msblk->block_cache); + squashfs_cache_delete(msblk->fragment_cache); + squashfs_cache_delete(msblk->read_page); +- zlib_free(msblk->stream); ++ squashfs_decompressor_free(msblk, msblk->stream); + kfree(msblk->inode_lookup_table); + kfree(msblk->fragment_index); + kfree(msblk->id_table); +@@ -298,7 +306,6 @@ failed_mount: + return err; + + failure: +- zlib_free(msblk->stream); + kfree(sb->s_fs_info); + sb->s_fs_info = NULL; + return -ENOMEM; +@@ -342,7 +349,7 @@ static void squashfs_put_super(struct su + squashfs_cache_delete(sbi->block_cache); + squashfs_cache_delete(sbi->fragment_cache); + squashfs_cache_delete(sbi->read_page); +- zlib_free(sbi->stream); ++ squashfs_decompressor_free(sbi, sbi->stream); + kfree(sbi->id_table); + kfree(sbi->fragment_index); + kfree(sbi->meta_index); +--- a/fs/squashfs/zlib_wrapper.c ++++ b/fs/squashfs/zlib_wrapper.c +@@ -30,8 +30,9 @@ + #include "squashfs_fs_sb.h" + #include "squashfs_fs_i.h" + #include "squashfs.h" ++#include "decompressor.h" + +-void *zlib_init() ++static void *zlib_init(void) + { + z_stream *stream = kmalloc(sizeof(z_stream), GFP_KERNEL); + if (stream == NULL) +@@ -50,7 +51,7 @@ failed: + } + + +-void zlib_free(void *strm) ++static void zlib_free(void *strm) + { + z_stream *stream = strm; + +@@ -60,7 +61,7 @@ void zlib_free(void *strm) + } + + +-int zlib_uncompress(struct squashfs_sb_info *msblk, void **buffer, ++static int zlib_uncompress(struct squashfs_sb_info *msblk, void **buffer, + struct buffer_head **bh, int b, int offset, int length, int srclength, + int pages) + { +@@ -137,3 +138,13 @@ release_mutex: + + return -EIO; + } ++ ++const struct squashfs_decompressor squashfs_zlib_comp_ops = { ++ .init = zlib_init, ++ .free = zlib_free, ++ .decompress = zlib_uncompress, ++ .id = ZLIB_COMPRESSION, ++ .name = "zlib", ++ .supported = 1 ++}; ++ |