fs/xfs/xfs_dinode.h - kernel/mindspeed - Git at Google

 /*
  * 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) == 2))

 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_PTR, XFS_DFORK_DPTR, 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.
  */
 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 */
 } __attribute__((packed)) xfs_dinode_t;

 #define DI_MAX_FLUSH 0xffff

 /*
  * 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) \
 	((int)(((mp)->m_sb.sb_inodesize) - sizeof(struct xfs_dinode)))

 #define	XFS_BROOT_SIZE_ADJ	\
 	(XFS_BTREE_LBLOCK_LEN - sizeof(xfs_bmdr_block_t))

 /*
  * 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))
 #define XFS_DFORK_ASIZE(dip,mp) \
 	(XFS_DFORK_Q(dip) ? \
 		XFS_LITINO(mp) - 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) + sizeof(struct xfs_dinode))
 #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__ */
	/*
	* 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) == 2))

	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_PTR, XFS_DFORK_DPTR, 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.
	*/
	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 */
	} __attribute__((packed)) xfs_dinode_t;

	#define DI_MAX_FLUSH 0xffff

	/*
	* 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) \
	((int)(((mp)->m_sb.sb_inodesize) - sizeof(struct xfs_dinode)))

	#define XFS_BROOT_SIZE_ADJ \
	(XFS_BTREE_LBLOCK_LEN - sizeof(xfs_bmdr_block_t))

	/*
	* 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))
	#define XFS_DFORK_ASIZE(dip,mp) \
	(XFS_DFORK_Q(dip) ? \
	XFS_LITINO(mp) - 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) + sizeof(struct xfs_dinode))
	#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__ */