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fs: initial qnx6fs addition

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Adds support for qnx6fs readonly support to the linux kernel.

* Mount option
  The option mmi_fs can be used to mount Harman Becker/Audi MMI 3G
  HDD qnx6fs filesystems.

* Documentation
  A high level filesystem stucture description can be found in the
  Documentation/filesystems directory. (qnx6.txt)

* Additional features
  - Active (stable) superblock selection
  - Superblock checksum check (enforced)
  - Supports mount of qnx6 filesystems with to host different endianess
  - Automatic endianess detection
  - Longfilename support (with non-enfocing crc check)
  - All blocksizes (512, 1024, 2048 and 4096 supported)

Signed-off-by: Kai Bankett <chaosman@ontika.net>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Kai Bankett 2012-02-17 05:59:20 +01:00 • committed by Al Viro
parent 516cdb68e5
commit 5d026c7242
13 changed files with 1668 additions and 0 deletions
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134
include/linux/qnx6_fs.h Normal file
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/*
* Name : qnx6_fs.h
* Author : Kai Bankett
* Function : qnx6 global filesystem definitions
* History : 17-01-2012 created
*/
#ifndef _LINUX_QNX6_FS_H
#define _LINUX_QNX6_FS_H
#include <linux/types.h>
#include <linux/magic.h>
#define QNX6_ROOT_INO 1
/* for di_status */
#define QNX6_FILE_DIRECTORY 0x01
#define QNX6_FILE_DELETED 0x02
#define QNX6_FILE_NORMAL 0x03
#define QNX6_SUPERBLOCK_SIZE 0x200 /* superblock always is 512 bytes */
#define QNX6_SUPERBLOCK_AREA 0x1000 /* area reserved for superblock */
#define QNX6_BOOTBLOCK_SIZE 0x2000 /* heading bootblock area */
#define QNX6_DIR_ENTRY_SIZE 0x20 /* dir entry size of 32 bytes */
#define QNX6_INODE_SIZE 0x80 /* each inode is 128 bytes */
#define QNX6_INODE_SIZE_BITS 7 /* inode entry size shift */
#define QNX6_NO_DIRECT_POINTERS 16 /* 16 blockptrs in sbl/inode */
#define QNX6_PTR_MAX_LEVELS 5 /* maximum indirect levels */
/* for filenames */
#define QNX6_SHORT_NAME_MAX 27
#define QNX6_LONG_NAME_MAX 510
/* list of mount options */
#define QNX6_MOUNT_MMI_FS 0x010000 /* mount as Audi MMI 3G fs */
/*
* This is the original qnx6 inode layout on disk.
* Each inode is 128 byte long.
*/
struct qnx6_inode_entry {
__fs64 di_size;
__fs32 di_uid;
__fs32 di_gid;
__fs32 di_ftime;
__fs32 di_mtime;
__fs32 di_atime;
__fs32 di_ctime;
__fs16 di_mode;
__fs16 di_ext_mode;
__fs32 di_block_ptr[QNX6_NO_DIRECT_POINTERS];
__u8 di_filelevels;
__u8 di_status;
__u8 di_unknown2[2];
__fs32 di_zero2[6];
};
/*
* Each directory entry is maximum 32 bytes long.
* If more characters or special characters required it is stored
* in the longfilenames structure.
*/
struct qnx6_dir_entry {
__fs32 de_inode;
__u8 de_size;
char de_fname[QNX6_SHORT_NAME_MAX];
};
/*
* Longfilename direntries have a different structure
*/
struct qnx6_long_dir_entry {
__fs32 de_inode;
__u8 de_size;
__u8 de_unknown[3];
__fs32 de_long_inode;
__fs32 de_checksum;
};
struct qnx6_long_filename {
__fs16 lf_size;
__u8 lf_fname[QNX6_LONG_NAME_MAX];
};
struct qnx6_root_node {
__fs64 size;
__fs32 ptr[QNX6_NO_DIRECT_POINTERS];
__u8 levels;
__u8 mode;
__u8 spare[6];
};
struct qnx6_super_block {
__fs32 sb_magic;
__fs32 sb_checksum;
__fs64 sb_serial;
__fs32 sb_ctime; /* time the fs was created */
__fs32 sb_atime; /* last access time */
__fs32 sb_flags;
__fs16 sb_version1; /* filesystem version information */
__fs16 sb_version2; /* filesystem version information */
__u8 sb_volumeid[16];
__fs32 sb_blocksize;
__fs32 sb_num_inodes;
__fs32 sb_free_inodes;
__fs32 sb_num_blocks;
__fs32 sb_free_blocks;
__fs32 sb_allocgroup;
struct qnx6_root_node Inode;
struct qnx6_root_node Bitmap;
struct qnx6_root_node Longfile;
struct qnx6_root_node Unknown;
};
/* Audi MMI 3G superblock layout is different to plain qnx6 */
struct qnx6_mmi_super_block {
__fs32 sb_magic;
__fs32 sb_checksum;
__fs64 sb_serial;
__u8 sb_spare0[12];
__u8 sb_id[12];
__fs32 sb_blocksize;
__fs32 sb_num_inodes;
__fs32 sb_free_inodes;
__fs32 sb_num_blocks;
__fs32 sb_free_blocks;
__u8 sb_spare1[4];
struct qnx6_root_node Inode;
struct qnx6_root_node Bitmap;
struct qnx6_root_node Longfile;
struct qnx6_root_node Unknown;
};
#endif