/*
   * Copyright (c) 2000,2002,2005 Silicon Graphics, Inc.
   * All Rights Reserved.
   *
   * 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.
   *
   * This program is distributed in the hope that it would 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 the Free Software Foundation,
   * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
   */
  #ifndef __XFS_DINODE_H__
  #define	__XFS_DINODE_H__
  
  #define	XFS_DINODE_MAGIC		0x494e	/* 'IN' */
  #define XFS_DINODE_GOOD_VERSION(v)	((v) >= 1 && (v) <= 3)
  
  typedef struct xfs_timestamp {
  	__be32		t_sec;		/* timestamp seconds */
  	__be32		t_nsec;		/* timestamp nanoseconds */
  } xfs_timestamp_t;
  
  /*
   * On-disk inode structure.
   *
   * This is just the header or "dinode core", the inode is expanded to fill a
   * variable size the leftover area split into a data and an attribute fork.
   * The format of the data and attribute fork depends on the format of the
   * inode as indicated by di_format and di_aformat.  To access the data and
   * attribute use the XFS_DFORK_DPTR, XFS_DFORK_APTR, and XFS_DFORK_PTR macros
   * below.
   *
   * There is a very similar struct icdinode in xfs_inode which matches the
   * layout of the first 96 bytes of this structure, but is kept in native
   * format instead of big endian.
   *
   * Note: di_flushiter is only used by v1/2 inodes - it's effectively a zeroed
   * padding field for v3 inodes.
   */
  typedef struct xfs_dinode {
  	__be16		di_magic;	/* inode magic # = XFS_DINODE_MAGIC */
  	__be16		di_mode;	/* mode and type of file */
  	__u8		di_version;	/* inode version */
  	__u8		di_format;	/* format of di_c data */
  	__be16		di_onlink;	/* old number of links to file */
  	__be32		di_uid;		/* owner's user id */
  	__be32		di_gid;		/* owner's group id */
  	__be32		di_nlink;	/* number of links to file */
  	__be16		di_projid_lo;	/* lower part of owner's project id */
  	__be16		di_projid_hi;	/* higher part owner's project id */
  	__u8		di_pad[6];	/* unused, zeroed space */
  	__be16		di_flushiter;	/* incremented on flush */
  	xfs_timestamp_t	di_atime;	/* time last accessed */
  	xfs_timestamp_t	di_mtime;	/* time last modified */
  	xfs_timestamp_t	di_ctime;	/* time created/inode modified */
  	__be64		di_size;	/* number of bytes in file */
  	__be64		di_nblocks;	/* # of direct & btree blocks used */
  	__be32		di_extsize;	/* basic/minimum extent size for file */
  	__be32		di_nextents;	/* number of extents in data fork */
  	__be16		di_anextents;	/* number of extents in attribute fork*/
  	__u8		di_forkoff;	/* attr fork offs, <<3 for 64b align */
  	__s8		di_aformat;	/* format of attr fork's data */
  	__be32		di_dmevmask;	/* DMIG event mask */
  	__be16		di_dmstate;	/* DMIG state info */
  	__be16		di_flags;	/* random flags, XFS_DIFLAG_... */
  	__be32		di_gen;		/* generation number */
  
  	/* di_next_unlinked is the only non-core field in the old dinode */
  	__be32		di_next_unlinked;/* agi unlinked list ptr */
  
  	/* start of the extended dinode, writable fields */
  	__le32		di_crc;		/* CRC of the inode */
  	__be64		di_changecount;	/* number of attribute changes */
  	__be64		di_lsn;		/* flush sequence */
  	__be64		di_flags2;	/* more random flags */
  	__u8		di_pad2[16];	/* more padding for future expansion */
  
  	/* fields only written to during inode creation */
  	xfs_timestamp_t	di_crtime;	/* time created */
  	__be64		di_ino;		/* inode number */
  	uuid_t		di_uuid;	/* UUID of the filesystem */
  
  	/* structure must be padded to 64 bit alignment */
  } xfs_dinode_t;
  
  #define DI_MAX_FLUSH 0xffff
  
  /*
   * Size of the core inode on disk.  Version 1 and 2 inodes have
   * the same size, but version 3 has grown a few additional fields.
   */
  static inline uint xfs_dinode_size(int version)
  {
  	if (version == 3)
  		return sizeof(struct xfs_dinode);
  	return offsetof(struct xfs_dinode, di_crc);
  }
  
  /*
   * The 32 bit link count in the inode theoretically maxes out at UINT_MAX.
   * Since the pathconf interface is signed, we use 2^31 - 1 instead.
   * The old inode format had a 16 bit link count, so its maximum is USHRT_MAX.
   */
  #define	XFS_MAXLINK		((1U << 31) - 1U)
  #define	XFS_MAXLINK_1		65535U
  
  /*
   * Values for di_format
   */
  typedef enum xfs_dinode_fmt {
  	XFS_DINODE_FMT_DEV,		/* xfs_dev_t */
  	XFS_DINODE_FMT_LOCAL,		/* bulk data */
  	XFS_DINODE_FMT_EXTENTS,		/* struct xfs_bmbt_rec */
  	XFS_DINODE_FMT_BTREE,		/* struct xfs_bmdr_block */
  	XFS_DINODE_FMT_UUID		/* uuid_t */
  } xfs_dinode_fmt_t;
  
  /*
   * Inode minimum and maximum sizes.
   */
  #define	XFS_DINODE_MIN_LOG	8
  #define	XFS_DINODE_MAX_LOG	11
  #define	XFS_DINODE_MIN_SIZE	(1 << XFS_DINODE_MIN_LOG)
  #define	XFS_DINODE_MAX_SIZE	(1 << XFS_DINODE_MAX_LOG)
  
  /*
   * Inode size for given fs.
   */
  #define XFS_LITINO(mp, version) \
  	((int)(((mp)->m_sb.sb_inodesize) - xfs_dinode_size(version)))
  
  /*
   * Inode data & attribute fork sizes, per inode.
   */
  #define XFS_DFORK_Q(dip)		((dip)->di_forkoff != 0)
  #define XFS_DFORK_BOFF(dip)		((int)((dip)->di_forkoff << 3))
  
  #define XFS_DFORK_DSIZE(dip,mp) \
  	(XFS_DFORK_Q(dip) ? \
  		XFS_DFORK_BOFF(dip) : \
  		XFS_LITINO(mp, (dip)->di_version))
  #define XFS_DFORK_ASIZE(dip,mp) \
  	(XFS_DFORK_Q(dip) ? \
  		XFS_LITINO(mp, (dip)->di_version) - XFS_DFORK_BOFF(dip) : \
  		0)
  #define XFS_DFORK_SIZE(dip,mp,w) \
  	((w) == XFS_DATA_FORK ? \
  		XFS_DFORK_DSIZE(dip, mp) : \
  		XFS_DFORK_ASIZE(dip, mp))
  
  /*
   * Return pointers to the data or attribute forks.
   */
  #define XFS_DFORK_DPTR(dip) \
  	((char *)dip + xfs_dinode_size(dip->di_version))
  #define XFS_DFORK_APTR(dip)	\
  	(XFS_DFORK_DPTR(dip) + XFS_DFORK_BOFF(dip))
  #define XFS_DFORK_PTR(dip,w)	\
  	((w) == XFS_DATA_FORK ? XFS_DFORK_DPTR(dip) : XFS_DFORK_APTR(dip))
  
  #define XFS_DFORK_FORMAT(dip,w) \
  	((w) == XFS_DATA_FORK ? \
  		(dip)->di_format : \
  		(dip)->di_aformat)
  #define XFS_DFORK_NEXTENTS(dip,w) \
  	((w) == XFS_DATA_FORK ? \
  		be32_to_cpu((dip)->di_nextents) : \
  		be16_to_cpu((dip)->di_anextents))
  
  #define	XFS_BUF_TO_DINODE(bp)	((xfs_dinode_t *)((bp)->b_addr))
  
  /*
   * For block and character special files the 32bit dev_t is stored at the
   * beginning of the data fork.
   */
  static inline xfs_dev_t xfs_dinode_get_rdev(struct xfs_dinode *dip)
  {
  	return be32_to_cpu(*(__be32 *)XFS_DFORK_DPTR(dip));
  }
  
  static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev)
  {
  	*(__be32 *)XFS_DFORK_DPTR(dip) = cpu_to_be32(rdev);
  }
  
  /*
   * Values for di_flags
   * There should be a one-to-one correspondence between these flags and the
   * XFS_XFLAG_s.
   */
  #define XFS_DIFLAG_REALTIME_BIT  0	/* file's blocks come from rt area */
  #define XFS_DIFLAG_PREALLOC_BIT  1	/* file space has been preallocated */
  #define XFS_DIFLAG_NEWRTBM_BIT   2	/* for rtbitmap inode, new format */
  #define XFS_DIFLAG_IMMUTABLE_BIT 3	/* inode is immutable */
  #define XFS_DIFLAG_APPEND_BIT    4	/* inode is append-only */
  #define XFS_DIFLAG_SYNC_BIT      5	/* inode is written synchronously */
  #define XFS_DIFLAG_NOATIME_BIT   6	/* do not update atime */
  #define XFS_DIFLAG_NODUMP_BIT    7	/* do not dump */
  #define XFS_DIFLAG_RTINHERIT_BIT 8	/* create with realtime bit set */
  #define XFS_DIFLAG_PROJINHERIT_BIT   9	/* create with parents projid */
  #define XFS_DIFLAG_NOSYMLINKS_BIT   10	/* disallow symlink creation */
  #define XFS_DIFLAG_EXTSIZE_BIT      11	/* inode extent size allocator hint */
  #define XFS_DIFLAG_EXTSZINHERIT_BIT 12	/* inherit inode extent size */
  #define XFS_DIFLAG_NODEFRAG_BIT     13	/* do not reorganize/defragment */
  #define XFS_DIFLAG_FILESTREAM_BIT   14  /* use filestream allocator */
  #define XFS_DIFLAG_REALTIME      (1 << XFS_DIFLAG_REALTIME_BIT)
  #define XFS_DIFLAG_PREALLOC      (1 << XFS_DIFLAG_PREALLOC_BIT)
  #define XFS_DIFLAG_NEWRTBM       (1 << XFS_DIFLAG_NEWRTBM_BIT)
  #define XFS_DIFLAG_IMMUTABLE     (1 << XFS_DIFLAG_IMMUTABLE_BIT)
  #define XFS_DIFLAG_APPEND        (1 << XFS_DIFLAG_APPEND_BIT)
  #define XFS_DIFLAG_SYNC          (1 << XFS_DIFLAG_SYNC_BIT)
  #define XFS_DIFLAG_NOATIME       (1 << XFS_DIFLAG_NOATIME_BIT)
  #define XFS_DIFLAG_NODUMP        (1 << XFS_DIFLAG_NODUMP_BIT)
  #define XFS_DIFLAG_RTINHERIT     (1 << XFS_DIFLAG_RTINHERIT_BIT)
  #define XFS_DIFLAG_PROJINHERIT   (1 << XFS_DIFLAG_PROJINHERIT_BIT)
  #define XFS_DIFLAG_NOSYMLINKS    (1 << XFS_DIFLAG_NOSYMLINKS_BIT)
  #define XFS_DIFLAG_EXTSIZE       (1 << XFS_DIFLAG_EXTSIZE_BIT)
  #define XFS_DIFLAG_EXTSZINHERIT  (1 << XFS_DIFLAG_EXTSZINHERIT_BIT)
  #define XFS_DIFLAG_NODEFRAG      (1 << XFS_DIFLAG_NODEFRAG_BIT)
  #define XFS_DIFLAG_FILESTREAM    (1 << XFS_DIFLAG_FILESTREAM_BIT)
  
  #ifdef CONFIG_XFS_RT
  #define XFS_IS_REALTIME_INODE(ip) ((ip)->i_d.di_flags & XFS_DIFLAG_REALTIME)
  #else
  #define XFS_IS_REALTIME_INODE(ip) (0)
  #endif
  
  #define XFS_DIFLAG_ANY \
  	(XFS_DIFLAG_REALTIME | XFS_DIFLAG_PREALLOC | XFS_DIFLAG_NEWRTBM | \
  	 XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND | XFS_DIFLAG_SYNC | \
  	 XFS_DIFLAG_NOATIME | XFS_DIFLAG_NODUMP | XFS_DIFLAG_RTINHERIT | \
  	 XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS | XFS_DIFLAG_EXTSIZE | \
  	 XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM)
  
  #endif	/* __XFS_DINODE_H__ */