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846b730e99
Further generalise the decompressors by adding a page handler abstraction. This adds helpers to allow the decompressors to access and process the output buffers in an implementation independant manner. This allows different types of output buffer to be passed to the decompressors, with the implementation specific aspects handled at decompression time, but without the knowledge being held in the decompressor wrapper code. This will allow the decompressors to handle Squashfs cache buffers, and page cache pages. This patch adds the abstraction and an implementation for the caches. Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk> Reviewed-by: Minchan Kim <minchan@kernel.org>
80 lines
2.1 KiB
C
80 lines
2.1 KiB
C
#ifndef SQUASHFS_FS_SB
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#define SQUASHFS_FS_SB
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/*
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* Squashfs
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*
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* Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008
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* Phillip Lougher <phillip@squashfs.org.uk>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2,
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* or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* squashfs_fs_sb.h
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*/
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#include "squashfs_fs.h"
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struct squashfs_cache {
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char *name;
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int entries;
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int curr_blk;
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int next_blk;
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int num_waiters;
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int unused;
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int block_size;
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int pages;
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spinlock_t lock;
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wait_queue_head_t wait_queue;
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struct squashfs_cache_entry *entry;
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};
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struct squashfs_cache_entry {
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u64 block;
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int length;
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int refcount;
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u64 next_index;
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int pending;
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int error;
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int num_waiters;
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wait_queue_head_t wait_queue;
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struct squashfs_cache *cache;
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void **data;
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struct squashfs_page_actor *actor;
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};
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struct squashfs_sb_info {
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const struct squashfs_decompressor *decompressor;
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int devblksize;
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int devblksize_log2;
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struct squashfs_cache *block_cache;
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struct squashfs_cache *fragment_cache;
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struct squashfs_cache *read_page;
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int next_meta_index;
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__le64 *id_table;
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__le64 *fragment_index;
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__le64 *xattr_id_table;
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struct mutex meta_index_mutex;
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struct meta_index *meta_index;
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struct squashfs_stream *stream;
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__le64 *inode_lookup_table;
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u64 inode_table;
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u64 directory_table;
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u64 xattr_table;
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unsigned int block_size;
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unsigned short block_log;
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long long bytes_used;
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unsigned int inodes;
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int xattr_ids;
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};
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#endif
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