(cache)linux/fs/freevxfs/vxfs.h at master · torvalds/linux · GitHub

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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (c) 2000-2001 Christoph Hellwig.
* Copyright (c) 2016 Krzysztof Blaszkowski
*/
#ifndef _VXFS_SUPER_H_
#define _VXFS_SUPER_H_

/*
* Veritas filesystem driver - superblock structure.
*
* This file contains the definition of the disk and core
* superblocks of the Veritas Filesystem.
*/
#include <linux/types.h>

/*
* Superblock magic number (vxfs_super->vs_magic).
*/
#define VXFS_SUPER_MAGIC	0xa501FCF5

/*
* The root inode.
*/
#define VXFS_ROOT_INO 2

/*
* Num of entries in free extent array
*/
#define VXFS_NEFREE 32

enum vxfs_byte_order {
VXFS_BO_LE,
VXFS_BO_BE,
};

typedef __u16 __bitwise __fs16;
typedef __u32 __bitwise __fs32;
typedef __u64 __bitwise __fs64;

/*
* VxFS superblock (disk).
*/
struct vxfs_sb {
/*
* Readonly fields for the version 1 superblock.
*
* Lots of this fields are no more used by version 2
* and never filesystems.
*/
__fs32 vs_magic; /* Magic number */
__fs32 vs_version; /* VxFS version */
__fs32 vs_ctime; /* create time - secs */
__fs32 vs_cutime; /* create time - usecs */
__fs32 __unused1; /* unused */
__fs32 __unused2; /* unused */
__fs32 vs_old_logstart;	/* obsolete */
__fs32 vs_old_logend; /* obsolete */
__fs32 vs_bsize; /* block size */
__fs32 vs_size; /* number of blocks */
__fs32 vs_dsize; /* number of data blocks */
__fs32 vs_old_ninode; /* obsolete */
__fs32 vs_old_nau; /* obsolete */
__fs32 __unused3; /* unused */
__fs32 vs_old_defiextsize;	/* obsolete */
__fs32 vs_old_ilbsize; /* obsolete */
__fs32 vs_immedlen; /* size of immediate data area */
__fs32 vs_ndaddr; /* number of direct extentes */
__fs32 vs_firstau; /* address of first AU */
__fs32 vs_emap; /* offset of extent map in AU */
__fs32 vs_imap; /* offset of inode map in AU */
__fs32 vs_iextop; /* offset of ExtOp. map in AU */
__fs32 vs_istart; /* offset of inode list in AU */
__fs32 vs_bstart; /* offset of fdblock in AU */
__fs32 vs_femap; /* aufirst + emap */
__fs32 vs_fimap; /* aufirst + imap */
__fs32 vs_fiextop; /* aufirst + iextop */
__fs32 vs_fistart; /* aufirst + istart */
__fs32 vs_fbstart; /* aufirst + bstart */
__fs32 vs_nindir; /* number of entries in indir */
__fs32 vs_aulen; /* length of AU in blocks */
__fs32 vs_auimlen; /* length of imap in blocks */
__fs32 vs_auemlen; /* length of emap in blocks */
__fs32 vs_auilen; /* length of ilist in blocks */
__fs32 vs_aupad; /* length of pad in blocks */
__fs32 vs_aublocks; /* data blocks in AU */
__fs32 vs_maxtier; /* log base 2 of aublocks */
__fs32 vs_inopb; /* number of inodes per blk */
__fs32 vs_old_inopau; /* obsolete */
__fs32 vs_old_inopilb; /* obsolete */
__fs32 vs_old_ndiripau;	/* obsolete */
__fs32 vs_iaddrlen; /* size of indirect addr ext. */
__fs32 vs_bshift; /* log base 2 of bsize */
__fs32 vs_inoshift; /* log base 2 of inobp */
__fs32 vs_bmask; /* ~( bsize - 1 ) */
__fs32 vs_boffmask; /* bsize - 1 */
__fs32 vs_old_inomask; /* old_inopilb - 1 */
__fs32 vs_checksum; /* checksum of V1 data */

/*
* Version 1, writable
*/
__fs32 vs_free; /* number of free blocks */
__fs32 vs_ifree; /* number of free inodes */
__fs32 vs_efree[VXFS_NEFREE];	/* number of free extents by size */
__fs32 vs_flags; /* flags ?!? */
__u8 vs_mod; /* filesystem has been changed */
__u8 vs_clean; /* clean FS */
__fs16 __unused4; /* unused */
__fs32 vs_firstlogid; /* mount time log ID */
__fs32 vs_wtime; /* last time written - sec */
__fs32 vs_wutime; /* last time written - usec */
__u8 vs_fname[6]; /* FS name */
__u8 vs_fpack[6]; /* FS pack name */
__fs32 vs_logversion; /* log format version */
__u32 __unused5; /* unused */

/*
* Version 2, Read-only
*/
__fs32 vs_oltext[2]; /* OLT extent and replica */
__fs32 vs_oltsize; /* OLT extent size */
__fs32 vs_iauimlen; /* size of inode map */
__fs32 vs_iausize; /* size of IAU in blocks */
__fs32 vs_dinosize; /* size of inode in bytes */
__fs32 vs_old_dniaddr; /* indir levels per inode */
__fs32 vs_checksum2; /* checksum of V2 RO */

/*
* Actually much more...
*/
};


/*
* In core superblock filesystem private data for VxFS.
*/
struct vxfs_sb_info {
struct vxfs_sb *vsi_raw;	/* raw (on disk) superblock */
struct buffer_head	*vsi_bp;	/* buffer for raw superblock*/
struct inode *vsi_fship;	/* fileset header inode */
struct inode *vsi_ilist;	/* inode list inode */
struct inode *vsi_stilist;	/* structural inode list inode */
u_long vsi_iext;	/* initial inode list */
ino_t vsi_fshino;	/* fileset header inode */
daddr_t vsi_oltext;	/* OLT extent */
daddr_t vsi_oltsize;	/* OLT size */
enum vxfs_byte_order	byte_order;
};

static inline u16 fs16_to_cpu(struct vxfs_sb_info *sbi, __fs16 a)
{
if (sbi->byte_order == VXFS_BO_BE)
return be16_to_cpu((__force __be16)a);
else
return le16_to_cpu((__force __le16)a);
}

static inline u32 fs32_to_cpu(struct vxfs_sb_info *sbi, __fs32 a)
{
if (sbi->byte_order == VXFS_BO_BE)
return be32_to_cpu((__force __be32)a);
else
return le32_to_cpu((__force __le32)a);
}

static inline u64 fs64_to_cpu(struct vxfs_sb_info *sbi, __fs64 a)
{
if (sbi->byte_order == VXFS_BO_BE)
return be64_to_cpu((__force __be64)a);
else
return le64_to_cpu((__force __le64)a);
}

/*
* File modes. File types above 0xf000 are vxfs internal only, they should
* not be passed back to higher levels of the system. vxfs file types must
* never have one of the regular file type bits set.
*/
enum vxfs_mode {
VXFS_ISUID = 0x00000800,	/* setuid */
VXFS_ISGID = 0x00000400,	/* setgid */
VXFS_ISVTX = 0x00000200,	/* sticky bit */
VXFS_IREAD = 0x00000100,	/* read */
VXFS_IWRITE = 0x00000080,	/* write */
VXFS_IEXEC = 0x00000040,	/* exec */

VXFS_IFIFO = 0x00001000,	/* Named pipe */
VXFS_IFCHR = 0x00002000,	/* Character device */
VXFS_IFDIR = 0x00004000,	/* Directory */
VXFS_IFNAM = 0x00005000,	/* Xenix device ?? */
VXFS_IFBLK = 0x00006000,	/* Block device */
VXFS_IFREG = 0x00008000,	/* Regular file */
VXFS_IFCMP = 0x00009000,	/* Compressed file ?!? */
VXFS_IFLNK = 0x0000a000,	/* Symlink */
VXFS_IFSOC = 0x0000c000,	/* Socket */

/* VxFS internal */
VXFS_IFFSH = 0x10000000,	/* Fileset header */
VXFS_IFILT = 0x20000000,	/* Inode list */
VXFS_IFIAU = 0x30000000,	/* Inode allocation unit */
VXFS_IFCUT = 0x40000000,	/* Current usage table */
VXFS_IFATT = 0x50000000,	/* Attr. inode */
VXFS_IFLCT = 0x60000000,	/* Link count table */
VXFS_IFIAT = 0x70000000,	/* Indirect attribute file */
VXFS_IFEMR = 0x80000000,	/* Extent map reorg file */
VXFS_IFQUO = 0x90000000,	/* BSD quota file */
VXFS_IFPTI = 0xa0000000,	/* "Pass through" inode */
VXFS_IFLAB = 0x11000000,	/* Device label file */
VXFS_IFOLT = 0x12000000,	/* OLT file */
VXFS_IFLOG = 0x13000000,	/* Log file */
VXFS_IFEMP = 0x14000000,	/* Extent map file */
VXFS_IFEAU = 0x15000000,	/* Extent AU file */
VXFS_IFAUS = 0x16000000,	/* Extent AU summary file */
VXFS_IFDEV = 0x17000000,	/* Device config file */

};

#define	VXFS_TYPE_MASK 0xfffff000

#define VXFS_IS_TYPE(ip,type)	(((ip)->vii_mode & VXFS_TYPE_MASK) == (type))
#define VXFS_ISFIFO(x) VXFS_IS_TYPE((x),VXFS_IFIFO)
#define VXFS_ISCHR(x) VXFS_IS_TYPE((x),VXFS_IFCHR)
#define VXFS_ISDIR(x) VXFS_IS_TYPE((x),VXFS_IFDIR)
#define VXFS_ISNAM(x) VXFS_IS_TYPE((x),VXFS_IFNAM)
#define VXFS_ISBLK(x) VXFS_IS_TYPE((x),VXFS_IFBLK)
#define VXFS_ISLNK(x) VXFS_IS_TYPE((x),VXFS_IFLNK)
#define VXFS_ISREG(x) VXFS_IS_TYPE((x),VXFS_IFREG)
#define VXFS_ISCMP(x) VXFS_IS_TYPE((x),VXFS_IFCMP)
#define VXFS_ISSOC(x) VXFS_IS_TYPE((x),VXFS_IFSOC)

#define VXFS_ISFSH(x) VXFS_IS_TYPE((x),VXFS_IFFSH)
#define VXFS_ISILT(x) VXFS_IS_TYPE((x),VXFS_IFILT)

/*
* Inmode organisation types.
*/
enum {
VXFS_ORG_NONE	= 0,	/* Inode has *no* format ?!? */
VXFS_ORG_EXT4	= 1,	/* Ext4 */
VXFS_ORG_IMMED	= 2,	/* All data stored in inode */
VXFS_ORG_TYPED	= 3,	/* Typed extents */
};

#define VXFS_IS_ORG(ip,org)	((ip)->vii_orgtype == (org))
#define VXFS_ISNONE(ip) VXFS_IS_ORG((ip), VXFS_ORG_NONE)
#define VXFS_ISEXT4(ip) VXFS_IS_ORG((ip), VXFS_ORG_EXT4)
#define VXFS_ISIMMED(ip)	VXFS_IS_ORG((ip), VXFS_ORG_IMMED)
#define VXFS_ISTYPED(ip)	VXFS_IS_ORG((ip), VXFS_ORG_TYPED)

/*
* Get filesystem private data from VFS superblock.
*/
#define VXFS_SBI(sbp) \
((struct vxfs_sb_info *)(sbp)->s_fs_info)

#endif /* _VXFS_SUPER_H_ */