super.h File Reference

Contains on-disk data structures, identifiers and functions for the SquashFS super block. More...

#include "sqfs/predef.h"

Go to the source code of this file.

Data Structures
struct	sqfs_super_t
	The SquashFS super block, located at the beginning of the file system to describe the layout of the filesystem. More...

Macros
#define	SQFS_MAGIC   0x73717368
#define	SQFS_VERSION_MAJOR   4
#define	SQFS_VERSION_MINOR   0
#define	SQFS_DEVBLK_SIZE   4096
#define	SQFS_MIN_BLOCK_SIZE   (4 * 1024)
#define	SQFS_MAX_BLOCK_SIZE   (1024 * 1024)
#define	SQFS_DEFAULT_BLOCK_SIZE   (128 * 1024)

Enumerations
enum	SQFS_COMPRESSOR {   SQFS_COMP_GZIP = 1 , SQFS_COMP_LZMA = 2 , SQFS_COMP_LZO = 3 , SQFS_COMP_XZ = 4 ,   SQFS_COMP_LZ4 = 5 , SQFS_COMP_ZSTD = 6 , SQFS_COMP_MIN = 1 , SQFS_COMP_MAX = 6 }
	Set in sqfs_super_t to identify the compresser used by the filesystem. More...
enum	SQFS_SUPER_FLAGS {   SQFS_FLAG_UNCOMPRESSED_INODES = 0x0001 , SQFS_FLAG_UNCOMPRESSED_DATA = 0x0002 , SQFS_FLAG_UNCOMPRESSED_FRAGMENTS = 0x0008 , SQFS_FLAG_NO_FRAGMENTS = 0x0010 ,   SQFS_FLAG_ALWAYS_FRAGMENTS = 0x0020 , SQFS_FLAG_NO_DUPLICATES = 0x0040 , SQFS_FLAG_EXPORTABLE = 0x0080 , SQFS_FLAG_UNCOMPRESSED_XATTRS = 0x0100 ,   SQFS_FLAG_NO_XATTRS = 0x0200 , SQFS_FLAG_COMPRESSOR_OPTIONS = 0x0400 , SQFS_FLAG_UNCOMPRESSED_IDS = 0x0800 }
	Flags that can be set in sqfs_super flags field. More...

Detailed Description

Contains on-disk data structures, identifiers and functions for the SquashFS super block.

Definition in file super.h.

Macro Definition Documentation

SQFS_DEFAULT_BLOCK_SIZE

#define SQFS_DEFAULT_BLOCK_SIZE   (128 * 1024)

Definition at line 39 of file super.h.

SQFS_DEVBLK_SIZE

#define SQFS_DEVBLK_SIZE   4096

Definition at line 35 of file super.h.

SQFS_MAGIC

#define SQFS_MAGIC   0x73717368

Definition at line 32 of file super.h.

SQFS_MAX_BLOCK_SIZE

#define SQFS_MAX_BLOCK_SIZE   (1024 * 1024)

Definition at line 38 of file super.h.

SQFS_MIN_BLOCK_SIZE

#define SQFS_MIN_BLOCK_SIZE   (4 * 1024)

Definition at line 37 of file super.h.

SQFS_VERSION_MAJOR

#define SQFS_VERSION_MAJOR   4

Definition at line 33 of file super.h.

SQFS_VERSION_MINOR

#define SQFS_VERSION_MINOR   0

Definition at line 34 of file super.h.

Enumeration Type Documentation

SQFS_COMPRESSOR

enum SQFS_COMPRESSOR

Set in sqfs_super_t to identify the compresser used by the filesystem.

Most of the flags that can be set are informative only.

Definition at line 194 of file super.h.

SQFS_SUPER_FLAGS

enum SQFS_SUPER_FLAGS

Flags that can be set in sqfs_super flags field.

Enumerator
SQFS_FLAG_UNCOMPRESSED_INODES	Set to indicate that meta data blocks holding the inodes are stored uncompressed.
SQFS_FLAG_UNCOMPRESSED_DATA	Set to indicate that all data blocks are stored uncompressed.
SQFS_FLAG_UNCOMPRESSED_FRAGMENTS	Set to indicate that all fragment blocks are stored uncompressed.
SQFS_FLAG_NO_FRAGMENTS	Set to indicate that there are no fragment blocks.
SQFS_FLAG_ALWAYS_FRAGMENTS	Set to indicate that fragments have been generated for all files that are not a multiple of the block size in size.
SQFS_FLAG_NO_DUPLICATES	Set to indicate that data blocks have not been deduplicated.
SQFS_FLAG_EXPORTABLE	Set to indicate that an NFS export table is present.
SQFS_FLAG_UNCOMPRESSED_XATTRS	Set to indicate that meta data blocks holding extended attributes are stored uncompressed.
SQFS_FLAG_NO_XATTRS	Set to indicate that the filesystem does not contain extended attributes.
SQFS_FLAG_COMPRESSOR_OPTIONS	Set to indicate that a single, uncompressed meta data block with compressor options follows the super block.
SQFS_FLAG_UNCOMPRESSED_IDS	Set to indicate that meta data blocks holding the IDs are stored uncompressed.

Definition at line 211 of file super.h.