/*
 * Copyright (c) 2000-2001 Christoph Hellwig.
 * Copyright (c) 2016 Krzysztof Blaszkowski
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL").
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */
#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_ */