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Add support for dumping and restoring project ids for regular files
and directories. This is done in a backwards compatible way --
restores from old IRIX dumps will restore the correct project id,
and restores from old Linux dumps will restore a 0 for the project
id.

Fix a bug on IRIX where the first two bytes of bs_pad1 in a bstat_t
were not being zeroed before being dumped. Document this fact since
it might affect the ability to use them in the future.

xfsrestore on IRIX was not restoring any extended inode flags for
directories. This is now fixed. Change setdirattr() to do only one
path_to_handle/open_by_handle sequence when restoring directory
attributes. Previously this was being done twice on Linux -- once
for setting the DMAPI event mask and once for the extended inode
flags.

/*
 * Copyright (c) 2000-2001 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 CONTENT_INODE_H
#define CONTENT_INODE_H

/* content_inode.h - inode-style content strategy-specific header structure
 */

/* dump startpoint: identifies dump stream boundaries
 * NOTE: sp_offset is not a position within a file; it is a quantity of
 * bytes to skip. holes do not count.
 */
struct startpt {
	xfs_ino_t sp_ino;		/* first inode to dump */
	off64_t sp_offset;	/* bytes to skip in file data fork */
	int32_t sp_flags;
	int32_t sp_pad1;
};

typedef struct startpt startpt_t;

#define STARTPT_FLAGS_END		( 1 << 0 )
		/* this startpt indicates that all extents of all files in
		 * the stream were completely dumped. the other fields
		 * are meaningless. this will appear only once per dump
		 * stream, even if the stream spans multiple media files.
		 *
		 * also used in the strategy-specific portion of the
		 * content header to qualify the ending point.
		 */
#define STARTPT_FLAGS_NULL		( 1 << 1 )
		/* used to detect if the null file header makes it onto
		 * media. only necessary after the last file in the stream,
		 * to allow the end-of-stream flag in the null header to
		 * be seen.
		 */


/* drange_t - describes a range of ino/offset values
 */
struct drange {
	startpt_t dr_begin;
	startpt_t dr_end;
};

typedef struct drange drange_t;


/* inode-style specific media file header section
 */
#define CONTENT_INODE_HDR_SZ  sizeofmember( content_hdr_t, ch_specific )

struct content_inode_hdr {
	int32_t cih_mediafiletype;			/*   4   4 */
		/* dump media file type: see #defines below */
	int32_t cih_dumpattr;				/*   4   8 */
		/* dump attributes: see #defines below */
	int32_t cih_level;				/*   4   c */
		/* dump level */
	char pad1[ 4 ];					/*   4  10 */
		/* alignment */
	time32_t cih_last_time;				/*   4  14 */
		/* if an incremental,time of previous dump at a lesser level */
	time32_t cih_resume_time;			/*   4  18 */
		/* if a resumed dump, time of interrupted dump */
	xfs_ino_t cih_rootino;				/*   8  20 */
		/* root inode number */
	uuid_t cih_last_id;				/*  10  30 */
		/* if an incremental, uuid of prev dump */
	uuid_t cih_resume_id;				/*  10  40 */
		/* if a resumed dump, uuid of interrupted dump */
	startpt_t cih_startpt;				/*  18  58 */
		/* starting point of media file contents */
	startpt_t cih_endpt;				/*  18  70 */
		/* starting point of next stream */
	u_int64_t cih_inomap_hnkcnt;			/*   8  78 */

	u_int64_t cih_inomap_segcnt;			/*   8  80 */

	u_int64_t cih_inomap_dircnt;			/*   8  88 */

	u_int64_t cih_inomap_nondircnt;			/*   8  90 */

	xfs_ino_t cih_inomap_firstino;			/*   8  98 */

	xfs_ino_t cih_inomap_lastino;			/*   8  a0 */

	u_int64_t cih_inomap_datasz;			/*   8  a8 */
		/* bytes of non-metadata dumped */
	char cih_pad2[ CONTENT_INODE_HDR_SZ - 0xa8 ];	/*  18  c0 */
		/* padding */
};

typedef struct content_inode_hdr content_inode_hdr_t;

/* media file types
 */
#define CIH_MEDIAFILETYPE_DATA		0
#define CIH_MEDIAFILETYPE_INVENTORY	1
#define CIH_MEDIAFILETYPE_INDEX		2

/* dump attributes
 */
#define	CIH_DUMPATTR_SUBTREE			( 1 <<  0 )
#define	CIH_DUMPATTR_INDEX			( 1 <<  1 )
#define CIH_DUMPATTR_INVENTORY			( 1 <<  2 )
#define CIH_DUMPATTR_INCREMENTAL		( 1 <<  3 )
#define CIH_DUMPATTR_RETRY			( 1 <<  4 )
#define CIH_DUMPATTR_RESUME			( 1 <<  5 )
#define CIH_DUMPATTR_INOMAP			( 1 <<  6 )
#define CIH_DUMPATTR_DIRDUMP			( 1 <<  7 )
#define CIH_DUMPATTR_FILEHDR_CHECKSUM		( 1 <<  8 )
#define CIH_DUMPATTR_EXTENTHDR_CHECKSUM		( 1 <<  9 )
#define CIH_DUMPATTR_DIRENTHDR_CHECKSUM		( 1 << 10 )
#define CIH_DUMPATTR_DIRENTHDR_GEN		( 1 << 11 )
#define CIH_DUMPATTR_EXTATTR			( 1 << 12 )
#define CIH_DUMPATTR_EXTATTRHDR_CHECKSUM	( 1 << 13 )


/* timestruct_t - time structure
 *
 * used in bstat_t below. derived from timestruc_t, to achieve independence
 * from changes to timestruc_t.
 */
#define TIMESTRUCT_SZ	8

struct timestruct {			/*		     bytes accum */
	int32_t		tv_sec;		/* seconds		 4     4 */
	int32_t		tv_nsec;	/* and nanoseconds	 4     8 */
};

typedef struct timestruct timestruct_t;


/* bstat_t - bulk stat structure
 *
 * used in filehdr_t below. derived from xfs_bstat_t, to achieve independence
 * from changes to xfs_bstat_t. 
 */
#define BSTAT_SZ	128
#define MODE_SZ		4

struct bstat {				/*		     bytes accum */
	xfs_ino_t	bs_ino;		/* inode number		 8     8 */
	u_int32_t	bs_mode;	/* type and mode	 4     c */
	u_int32_t	bs_nlink;	/* number of links	 4    10 */
	int32_t		bs_uid;		/* user id		 4    14 */
	int32_t		bs_gid;		/* group id		 4    18 */
	u_int32_t	bs_rdev;	/* device value		 4    1c */
	int32_t		bs_blksize;	/* block size		 4    20 */
	off64_t		bs_size;	/* file size		 8    28 */
	timestruct_t	bs_atime;	/* access time		 8    30 */
	timestruct_t	bs_mtime;	/* modify time		 8    38 */
	timestruct_t	bs_ctime;	/* inode change time	 8    40 */
	int64_t		bs_blocks;	/* number of blocks	 8    48 */
	u_int32_t	bs_xflags;	/* extended flags	 4    4c */
	int32_t		bs_extsize;	/* extent size		 4    50 */
	int32_t		bs_extents;	/* number of extents	 4    54 */
	u_int32_t	bs_gen;		/* generation count	 4    58 */
	u_int16_t	bs_projid;	/* project id		 2    5a */
	char		bs_pad[14];	/* for expansion	 e    68 */
	u_int32_t	bs_dmevmask;	/* DMI event mask        4    6c */
	u_int16_t	bs_dmstate;	/* DMI state info        2    6e */
	char		bs_pad1[ 18 ];	/* for expansion        12    80 */
					/* NOTE: old dumps didn't always
					 * zero first 2 bytes of bs_pad1 */
};

typedef struct bstat bstat_t;

/* filehdr_t - header placed at the beginning of every dumped file.
 *
 * each fs file placed on dump media begins with a FILEHDR_SZ-byte header.
 * following that are one or more variable-length content extents.
 * the content extents contain the actual data associated with the fs file. 
 */
#define FILEHDR_SZ	256

struct filehdr {
	int64_t fh_offset;
	int32_t fh_flags;
	u_int32_t fh_checksum;
	bstat_t fh_stat;
	char fh_pad2[ FILEHDR_SZ
		      - sizeof( int64_t )
		      - sizeof( int32_t )
		      - sizeof( u_int32_t )
		      - sizeof( bstat_t ) ];
};

typedef struct filehdr filehdr_t;

#define FILEHDR_FLAGS_NULL	( 1 << 0 )
		/* identifies a dummy file header. every media file
		 * is terminated with a dummy file header, unless
		 * terminated by end of media.
		 */
#define FILEHDR_FLAGS_CHECKSUM	( 1 << 1 )
		/* indicates the header checksum is valid
		 */
#define FILEHDR_FLAGS_END	( 1 << 2 )
		/* the last media file in the stream is always terminated by
		 * a dummy file header, with this flag set.
		 */
#define FILEHDR_FLAGS_EXTATTR	( 1 << 3 )
		/* special file header followed by one file's (dir or nondir)
		 * extended attributes.
		 */


/* extenthdr_t - a header placed at the beginning of every dumped
 * content extent.
 *
 * a dumped file consists of a filehdr_t followed by zero or more
 * extents. for regular files the last extent is always of type LAST.
 * for symbolic link files, only one extent is dumped, and it contains the
 * symlink path.
 */
#define EXTENTHDR_SZ	32

struct extenthdr {
	off64_t eh_sz; /* length of extent, NOT including header, in bytes */
	off64_t eh_offset;
	int32_t eh_type;
	int32_t eh_flags;
	u_int32_t eh_checksum;
	char eh_pad[ 4 ];
};

typedef struct extenthdr extenthdr_t;

#define EXTENTHDR_TYPE_LAST	0
		/* always the last extent. sz is always 0
		 */
#define EXTENTHDR_TYPE_ALIGN	1
		/* used for alignment. sz is the number of bytes to skip,
		 * in addition to the hdr
		 */
#define EXTENTHDR_TYPE_DATA	4
		/* heads an extent of ordinary file data. sz is the data
		 * extent length in bytes, NOT including the hdr. offset
		 * indicates the byte position of the extent within the file.
		 * also heads the path in a symlink dump.
		 */
#define EXTENTHDR_TYPE_HOLE	8
		/* used to encode a hole extent. Offset indicates the byte
		 * position of the hole within the file and sz is the
		 * hole extent length.
		 */

#define EXTENTHDR_FLAGS_CHECKSUM	( 1 << 0 )


/* direnthdr_t - placed at the beginning of every dumped directory entry.
 * a directory entry consists of the fixed size header followed by a variable
 * length NULL-terminated name string, followed by enough padding to make the
 * overall record size a multiple of 8 bytes. the name string begins
 * at the dh_name field. the total number of bytes occupied by
 * each directory entry on media is dh_sz.
 *
 * a sequence of directory entries is always terminated with a null direnthdr_t.
 * this is detected by looking for a zero ino.
 */
#define DIRENTHDR_ALIGN	8

#define DIRENTHDR_SZ	24

struct direnthdr {
	xfs_ino_t dh_ino;
	u_int16_t dh_gen; /* generation count & DENTGENMASK of ref'ed inode */
	u_int16_t dh_sz; /* overall size of record */
	u_int32_t dh_checksum;
	char dh_name[ 8 ];
};

typedef struct direnthdr direnthdr_t;

/* truncated generation count
 */
#define DENTGENSZ		12	/* leave 4 bits for future flags */
#define DENTGENMASK		(( 1 << DENTGENSZ ) - 1 )
typedef u_int16_t gen_t;
#define GEN_NULL		( ( gen_t )UINT16MAX )
#define BIGGEN2GEN( bg )	( ( gen_t )( bg & DENTGENMASK ))



/* symbolic links will be dumped using an extent header. the extent
 * will always be a multiple of SYMLINK_ALIGN bytes. the symlink character
 * string will always be null-terminated.
 */
#define SYMLINK_ALIGN	8

/* extattr_hdr_t - hdr for an extended attribute. the first byte of the
 * attribute name immediately follows the header. the name is terminated
 * with a NULL byte. Each extattr record will be aligned; there may
 * be padding at the end of each record to achieve this. NOTE: ah_sz
 * includes the hdr sz; adding ah_sz to the offset of one extattr
 * gives the offset of the next.
 */
#define EXTATTRHDR_SZ		16
#define EXTATTRHDR_ALIGN	8

struct extattrhdr {
	u_int32_t ah_sz; /* overall size of extended attribute record */
	u_int16_t ah_valoff; /* byte offset within record of value */
	u_int16_t ah_flags; /* see EXTATTRHDR_FLAGS_... below */
	u_int32_t ah_valsz; /* size of value */
	u_int32_t ah_checksum; /* hdr checksum */
};

typedef struct extattrhdr extattrhdr_t;

#define EXTATTRHDR_FLAGS_ROOT		( 1 << 0 )
	/* a "root" mode attribute
	 */
#define EXTATTRHDR_FLAGS_NULL		( 1 << 1 )
	/* marks the end of the attributes associated with the leading filehdr_t
	 */
#define EXTATTRHDR_FLAGS_CHECKSUM	( 1 << 2 )
	/* checksum is present
	 */

#define EXTATTRHDR_FLAGS_SECURE		( 1 << 3 )
	/* a "secure" mode attribute
	 */

#endif /* CONTENT_INODE_H */