Subject: [PATCH 12/16] Squashfs: header files
From: Phillip Lougher
Date: Fri Oct 17 2008 - 11:44:18 EST
Signed-off-by: Phillip Lougher <phillip@xxxxxxxxxxxxxxxxxxx>
---
fs/squashfs/squashfs.h | 100 +++++++++++
include/linux/squashfs_fs.h | 383 ++++++++++++++++++++++++++++++++++++++++
include/linux/squashfs_fs_i.h | 45 +++++
include/linux/squashfs_fs_sb.h | 76 ++++++++
4 files changed, 604 insertions(+), 0 deletions(-)
diff --git a/fs/squashfs/squashfs.h b/fs/squashfs/squashfs.h
new file mode 100644
index 0000000..711cd43
--- /dev/null
+++ b/fs/squashfs/squashfs.h
@@ -0,0 +1,100 @@
+/*
+ * Squashfs - a compressed read only filesystem for Linux
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008
+ * Phillip Lougher <phillip@xxxxxxxxxxxxxxxxxxx>
+ *
+ * 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.
+ *
+ * squashfs.h
+ */
+
+#ifdef SQUASHFS_TRACE
+#define TRACE(s, args...) printk(KERN_NOTICE "SQUASHFS: "s, ## args)
+#else
+#define TRACE(s, args...) {}
+#endif
+
+#define ERROR(s, args...) printk(KERN_ERR "SQUASHFS error: "s, ## args)
+
+#define SERROR(s, args...) \
+ do { \
+ if (!silent) \
+ printk(KERN_ERR "SQUASHFS error: "s, ## args);\
+ } while (0)
+
+#define WARNING(s, args...) printk(KERN_WARNING "SQUASHFS: "s, ## args)
+
+static inline struct squashfs_inode_info *SQUASHFS_I(struct inode *inode)
+{
+ return list_entry(inode, struct squashfs_inode_info, vfs_inode);
+}
+
+/* block.c */
+extern unsigned int squashfs_read_data(struct super_block *, void *,
+ long long, unsigned int, long long *, int);
+
+/* cache.c */
+extern struct squashfs_cache *squashfs_cache_init(char *, int, int, int);
+extern void squashfs_cache_delete(struct squashfs_cache *);
+struct squashfs_cache_entry *squashfs_cache_get(struct super_block *,
+ struct squashfs_cache *, long long, int);
+void squashfs_cache_put(struct squashfs_cache *, struct squashfs_cache_entry *);
+extern int squashfs_read_metadata(struct super_block *, void *,
+ long long, unsigned int, int, long long *,
+ unsigned int *);
+extern struct squashfs_cache_entry *get_cached_fragment(struct super_block *,
+ long long, int);
+extern void release_cached_fragment(struct squashfs_sb_info *,
+ struct squashfs_cache_entry *);
+
+/* export.c */
+extern __le64 *read_inode_lookup_table(struct super_block *, long long,
+ unsigned int);
+
+/* fragment.c */
+extern int get_fragment_location(struct super_block *, unsigned int,
+ long long *);
+extern __le64 *read_fragment_index_table(struct super_block *, long long,
+ unsigned int);
+
+/* id.c */
+extern int squashfs_get_id(struct super_block *, unsigned int, unsigned int *);
+extern __le64 *read_id_index_table(struct super_block *, long long,
+ unsigned short);
+
+/* inode.c */
+extern struct inode *squashfs_iget(struct super_block *, long long,
+ unsigned int);
+extern int squashfs_read_inode(struct inode *, long long);
+
+/*
+ * Inodes and files operations
+ */
+
+/* dir.c */
+extern const struct file_operations squashfs_dir_ops;
+
+/* export.c */
+extern const struct export_operations squashfs_export_ops;
+
+/* file.c */
+extern const struct address_space_operations squashfs_aops;
+
+/* namei.c */
+extern const struct inode_operations squashfs_dir_inode_ops;
+
+/* symlink.c */
+extern const struct address_space_operations squashfs_symlink_aops;
diff --git a/include/linux/squashfs_fs.h b/include/linux/squashfs_fs.h
new file mode 100644
index 0000000..aeb902f
--- /dev/null
+++ b/include/linux/squashfs_fs.h
@@ -0,0 +1,383 @@
+#ifndef SQUASHFS_FS
+#define SQUASHFS_FS
+/*
+ * Squashfs
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008
+ * Phillip Lougher <phillip@xxxxxxxxxxxxxxxxxxx>
+ *
+ * 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.
+ *
+ * squashfs_fs.h
+ */
+
+#define SQUASHFS_CACHED_FRAGMENTS CONFIG_SQUASHFS_FRAGMENT_CACHE_SIZE
+#define SQUASHFS_MAJOR 4
+#define SQUASHFS_MINOR 0
+#define SQUASHFS_MAGIC 0x73717368
+#define SQUASHFS_MAGIC_SWAP 0x68737173
+#define SQUASHFS_START 0
+
+/* size of metadata (inode and directory) blocks */
+#define SQUASHFS_METADATA_SIZE 8192
+#define SQUASHFS_METADATA_LOG 13
+
+/* default size of data blocks */
+#define SQUASHFS_FILE_SIZE 131072
+#define SQUASHFS_FILE_LOG 17
+
+#define SQUASHFS_FILE_MAX_SIZE 1048576
+
+/* Max number of uids and gids */
+#define SQUASHFS_IDS 65536
+
+/* Max length of filename (not 255) */
+#define SQUASHFS_NAME_LEN 256
+
+#define SQUASHFS_INVALID (0xffffffffffffLL)
+#define SQUASHFS_INVALID_FRAG (0xffffffffU)
+#define SQUASHFS_INVALID_BLK (-1LL)
+#define SQUASHFS_USED_BLK (-2LL)
+
+/* Filesystem flags */
+#define SQUASHFS_NOI 0
+#define SQUASHFS_NOD 1
+#define SQUASHFS_NOF 3
+#define SQUASHFS_NO_FRAG 4
+#define SQUASHFS_ALWAYS_FRAG 5
+#define SQUASHFS_DUPLICATE 6
+#define SQUASHFS_EXPORT 7
+
+#define SQUASHFS_BIT(flag, bit) ((flag >> bit) & 1)
+
+#define SQUASHFS_UNCOMPRESSED_INODES(flags) SQUASHFS_BIT(flags, \
+ SQUASHFS_NOI)
+
+#define SQUASHFS_UNCOMPRESSED_DATA(flags) SQUASHFS_BIT(flags, \
+ SQUASHFS_NOD)
+
+#define SQUASHFS_UNCOMPRESSED_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
+ SQUASHFS_NOF)
+
+#define SQUASHFS_NO_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
+ SQUASHFS_NO_FRAG)
+
+#define SQUASHFS_ALWAYS_FRAGMENTS(flags) SQUASHFS_BIT(flags, \
+ SQUASHFS_ALWAYS_FRAG)
+
+#define SQUASHFS_DUPLICATES(flags) SQUASHFS_BIT(flags, \
+ SQUASHFS_DUPLICATE)
+
+#define SQUASHFS_EXPORTABLE(flags) SQUASHFS_BIT(flags, \
+ SQUASHFS_EXPORT)
+
+#define SQUASHFS_MKFLAGS(noi, nod, nof, no_frag, always_frag, \
+ duplicate_checking, exportable) (noi | (nod << 1) \
+ | (nof << 3) | (no_frag << 4) | (always_frag << 5) | \
+ (duplicate_checking << 6) | (exportable << 7))
+
+/* Max number of types and file types */
+#define SQUASHFS_DIR_TYPE 1
+#define SQUASHFS_FILE_TYPE 2
+#define SQUASHFS_SYMLINK_TYPE 3
+#define SQUASHFS_BLKDEV_TYPE 4
+#define SQUASHFS_CHRDEV_TYPE 5
+#define SQUASHFS_FIFO_TYPE 6
+#define SQUASHFS_SOCKET_TYPE 7
+#define SQUASHFS_LDIR_TYPE 8
+#define SQUASHFS_LREG_TYPE 9
+
+/* Flag whether block is compressed or uncompressed, bit is set if block is
+ * uncompressed */
+#define SQUASHFS_COMPRESSED_BIT (1 << 15)
+
+#define SQUASHFS_COMPRESSED_SIZE(B) (((B) & ~SQUASHFS_COMPRESSED_BIT) ? \
+ (B) & ~SQUASHFS_COMPRESSED_BIT : SQUASHFS_COMPRESSED_BIT)
+
+#define SQUASHFS_COMPRESSED(B) (!((B) & SQUASHFS_COMPRESSED_BIT))
+
+#define SQUASHFS_COMPRESSED_BIT_BLOCK (1 << 24)
+
+#define SQUASHFS_COMPRESSED_SIZE_BLOCK(B) ((B) & \
+ ~SQUASHFS_COMPRESSED_BIT_BLOCK)
+
+#define SQUASHFS_COMPRESSED_BLOCK(B) (!((B) & SQUASHFS_COMPRESSED_BIT_BLOCK))
+
+/*
+ * Inode number ops. Inodes consist of a compressed block number, and an
+ * uncompressed offset within that block
+ */
+#define SQUASHFS_INODE_BLK(A) ((unsigned int) ((A) >> 16))
+
+#define SQUASHFS_INODE_OFFSET(A) ((unsigned int) ((A) & 0xffff))
+
+#define SQUASHFS_MKINODE(A, B) \
+ ((long long)(((long long) (A)\
+ << 16) + (B)))
+
+/* Translate between VFS mode and squashfs mode */
+#define SQUASHFS_MODE(A) ((A) & 0xfff)
+
+/* fragment and fragment table defines */
+#define SQUASHFS_FRAGMENT_BYTES(A) \
+ ((A) * sizeof(struct squashfs_fragment_entry))
+
+#define SQUASHFS_FRAGMENT_INDEX(A) (SQUASHFS_FRAGMENT_BYTES(A) / \
+ SQUASHFS_METADATA_SIZE)
+
+#define SQUASHFS_FRAGMENT_INDEX_OFFSET(A) (SQUASHFS_FRAGMENT_BYTES(A) % \
+ SQUASHFS_METADATA_SIZE)
+
+#define SQUASHFS_FRAGMENT_INDEXES(A) ((SQUASHFS_FRAGMENT_BYTES(A) + \
+ SQUASHFS_METADATA_SIZE - 1) / \
+ SQUASHFS_METADATA_SIZE)
+
+#define SQUASHFS_FRAGMENT_INDEX_BYTES(A) (SQUASHFS_FRAGMENT_INDEXES(A) *\
+ sizeof(long long))
+
+/* inode lookup table defines */
+#define SQUASHFS_LOOKUP_BYTES(A) ((A) * sizeof(long long))
+
+#define SQUASHFS_LOOKUP_BLOCK(A) (SQUASHFS_LOOKUP_BYTES(A) / \
+ SQUASHFS_METADATA_SIZE)
+
+#define SQUASHFS_LOOKUP_BLOCK_OFFSET(A) (SQUASHFS_LOOKUP_BYTES(A) % \
+ SQUASHFS_METADATA_SIZE)
+
+#define SQUASHFS_LOOKUP_BLOCKS(A) ((SQUASHFS_LOOKUP_BYTES(A) + \
+ SQUASHFS_METADATA_SIZE - 1) / \
+ SQUASHFS_METADATA_SIZE)
+
+#define SQUASHFS_LOOKUP_BLOCK_BYTES(A) (SQUASHFS_LOOKUP_BLOCKS(A) *\
+ sizeof(long long))
+
+/* uid/gid lookup table defines */
+#define SQUASHFS_ID_BYTES(A) ((A) * sizeof(unsigned int))
+
+#define SQUASHFS_ID_BLOCK(A) (SQUASHFS_ID_BYTES(A) / \
+ SQUASHFS_METADATA_SIZE)
+
+#define SQUASHFS_ID_BLOCK_OFFSET(A) (SQUASHFS_ID_BYTES(A) % \
+ SQUASHFS_METADATA_SIZE)
+
+#define SQUASHFS_ID_BLOCKS(A) ((SQUASHFS_ID_BYTES(A) + \
+ SQUASHFS_METADATA_SIZE - 1) / \
+ SQUASHFS_METADATA_SIZE)
+
+#define SQUASHFS_ID_BLOCK_BYTES(A) (SQUASHFS_ID_BLOCKS(A) *\
+ sizeof(long long))
+
+/* cached data constants for filesystem */
+#define SQUASHFS_CACHED_BLKS 8
+
+#define SQUASHFS_MAX_FILE_SIZE_LOG 64
+
+#define SQUASHFS_MAX_FILE_SIZE (1LL << \
+ (SQUASHFS_MAX_FILE_SIZE_LOG - 2))
+
+#define SQUASHFS_MARKER_BYTE 0xff
+
+/* meta index cache */
+#define SQUASHFS_META_INDEXES (SQUASHFS_METADATA_SIZE / sizeof(unsigned int))
+#define SQUASHFS_META_ENTRIES 127
+#define SQUASHFS_META_SLOTS 8
+
+struct meta_entry {
+ long long data_block;
+ unsigned int index_block;
+ unsigned short offset;
+ unsigned short pad;
+};
+
+struct meta_index {
+ unsigned int inode_number;
+ unsigned int offset;
+ unsigned short entries;
+ unsigned short skip;
+ unsigned short locked;
+ unsigned short pad;
+ struct meta_entry meta_entry[SQUASHFS_META_ENTRIES];
+};
+
+
+/*
+ * definitions for structures on disk
+ */
+#define ZLIB_COMPRESSION 1
+
+struct squashfs_super_block {
+ __le32 s_magic;
+ __le32 inodes;
+ __le32 mkfs_time;
+ __le32 block_size;
+ __le32 fragments;
+ __le16 compression;
+ __le16 block_log;
+ __le16 flags;
+ __le16 no_ids;
+ __le16 s_major;
+ __le16 s_minor;
+ __le64 root_inode;
+ __le64 bytes_used;
+ __le64 id_table_start;
+ __le64 xattr_table_start;
+ __le64 inode_table_start;
+ __le64 directory_table_start;
+ __le64 fragment_table_start;
+ __le64 lookup_table_start;
+};
+
+struct squashfs_dir_index {
+ __le32 index;
+ __le32 start_block;
+ __le32 size;
+ unsigned char name[0];
+};
+
+struct squashfs_base_inode {
+ __le16 inode_type;
+ __le16 mode;
+ __le16 uid;
+ __le16 guid;
+ __le32 mtime;
+ __le32 inode_number;
+};
+
+struct squashfs_ipc_inode {
+ __le16 inode_type;
+ __le16 mode;
+ __le16 uid;
+ __le16 guid;
+ __le32 mtime;
+ __le32 inode_number;
+ __le32 nlink;
+};
+
+struct squashfs_dev_inode {
+ __le16 inode_type;
+ __le16 mode;
+ __le16 uid;
+ __le16 guid;
+ __le32 mtime;
+ __le32 inode_number;
+ __le32 nlink;
+ __le32 rdev;
+};
+
+struct squashfs_symlink_inode {
+ __le16 inode_type;
+ __le16 mode;
+ __le16 uid;
+ __le16 guid;
+ __le32 mtime;
+ __le32 inode_number;
+ __le32 nlink;
+ __le32 symlink_size;
+ char symlink[0];
+};
+
+struct squashfs_reg_inode {
+ __le16 inode_type;
+ __le16 mode;
+ __le16 uid;
+ __le16 guid;
+ __le32 mtime;
+ __le32 inode_number;
+ __le32 start_block;
+ __le32 fragment;
+ __le32 offset;
+ __le32 file_size;
+ __le16 block_list[0];
+};
+
+struct squashfs_lreg_inode {
+ __le16 inode_type;
+ __le16 mode;
+ __le16 uid;
+ __le16 guid;
+ __le32 mtime;
+ __le32 inode_number;
+ __le64 start_block;
+ __le64 file_size;
+ __le64 sparse;
+ __le32 nlink;
+ __le32 fragment;
+ __le32 offset;
+ __le32 xattr;
+ __le16 block_list[0];
+};
+
+struct squashfs_dir_inode {
+ __le16 inode_type;
+ __le16 mode;
+ __le16 uid;
+ __le16 guid;
+ __le32 mtime;
+ __le32 inode_number;
+ __le32 start_block;
+ __le32 nlink;
+ __le16 file_size;
+ __le16 offset;
+ __le32 parent_inode;
+};
+
+struct squashfs_ldir_inode {
+ __le16 inode_type;
+ __le16 mode;
+ __le16 uid;
+ __le16 guid;
+ __le32 mtime;
+ __le32 inode_number;
+ __le32 nlink;
+ __le32 file_size;
+ __le32 start_block;
+ __le32 parent_inode;
+ __le16 i_count;
+ __le16 offset;
+ struct squashfs_dir_index index[0];
+};
+
+union squashfs_inode {
+ struct squashfs_base_inode base;
+ struct squashfs_dev_inode dev;
+ struct squashfs_symlink_inode symlink;
+ struct squashfs_reg_inode reg;
+ struct squashfs_lreg_inode lreg;
+ struct squashfs_dir_inode dir;
+ struct squashfs_ldir_inode ldir;
+ struct squashfs_ipc_inode ipc;
+};
+
+struct squashfs_dir_entry {
+ __le16 offset;
+ __le16 inode_number;
+ __le16 type;
+ __le16 size;
+ char name[0];
+};
+
+struct squashfs_dir_header {
+ __le32 count;
+ __le32 start_block;
+ __le32 inode_number;
+};
+
+struct squashfs_fragment_entry {
+ __le64 start_block;
+ __le32 size;
+ unsigned int unused;
+};
+
+#endif
diff --git a/include/linux/squashfs_fs_i.h b/include/linux/squashfs_fs_i.h
new file mode 100644
index 0000000..b8abd56
--- /dev/null
+++ b/include/linux/squashfs_fs_i.h
@@ -0,0 +1,45 @@
+#ifndef SQUASHFS_FS_I
+#define SQUASHFS_FS_I
+/*
+ * Squashfs
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008
+ * Phillip Lougher <phillip@xxxxxxxxxxxxxxxxxxx>
+ *
+ * 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.
+ *
+ * squashfs_fs_i.h
+ */
+
+struct squashfs_inode_info {
+ long long start_block;
+ unsigned int offset;
+ union {
+ struct {
+ long long fragment_block;
+ unsigned int fragment_size;
+ unsigned int fragment_offset;
+ long long block_list_start;
+ };
+ struct {
+ long long dir_index_start;
+ unsigned int dir_index_offset;
+ unsigned int dir_index_count;
+ unsigned int parent_inode;
+ };
+ };
+ struct inode vfs_inode;
+};
+#endif
diff --git a/include/linux/squashfs_fs_sb.h b/include/linux/squashfs_fs_sb.h
new file mode 100644
index 0000000..9bfe29c
--- /dev/null
+++ b/include/linux/squashfs_fs_sb.h
@@ -0,0 +1,76 @@
+#ifndef SQUASHFS_FS_SB
+#define SQUASHFS_FS_SB
+/*
+ * Squashfs
+ *
+ * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008
+ * Phillip Lougher <phillip@xxxxxxxxxxxxxxxxxxx>
+ *
+ * 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.
+ *
+ * squashfs_fs_sb.h
+ */
+
+#include <linux/squashfs_fs.h>
+
+struct squashfs_cache_entry {
+ long long block;
+ int length;
+ int locked;
+ long long next_index;
+ char pending;
+ char error;
+ int waiting;
+ wait_queue_head_t wait_queue;
+ char *data;
+};
+
+struct squashfs_cache {
+ char *name;
+ int entries;
+ int block_size;
+ int next_blk;
+ int waiting;
+ int unused;
+ int use_vmalloc;
+ spinlock_t lock;
+ wait_queue_head_t wait_queue;
+ struct squashfs_cache_entry entry[0];
+};
+
+struct squashfs_sb_info {
+ int devblksize;
+ int devblksize_log2;
+ struct squashfs_cache *block_cache;
+ struct squashfs_cache *fragment_cache;
+ int next_meta_index;
+ __le64 *id_table;
+ __le64 *fragment_index;
+ unsigned int *fragment_index_2;
+ char *read_page;
+ struct mutex read_data_mutex;
+ struct mutex read_page_mutex;
+ struct mutex meta_index_mutex;
+ struct meta_index *meta_index;
+ z_stream stream;
+ __le64 *inode_lookup_table;
+ long long inode_table_start;
+ long long directory_table_start;
+ unsigned int block_size;
+ unsigned short block_log;
+ long long bytes_used;
+ unsigned int inodes;
+};
+#endif
--
1.5.2.5
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