/*      $NetBSD: ext2fs_dinode.h,v 1.37 2017/01/13 18:04:36 christos Exp $      */

/*
* Copyright (c) 1982, 1989, 1993
*      The Regents of the University of California.  All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* 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.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*
*      @(#)dinode.h    8.6 (Berkeley) 9/13/94
*  Modified for ext2fs by Manuel Bouyer.
*/

/*
* Copyright (c) 1997 Manuel Bouyer.
*
* 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.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
*
*      @(#)dinode.h    8.6 (Berkeley) 9/13/94
*  Modified for ext2fs by Manuel Bouyer.
*/

#ifndef _UFS_EXT2FS_EXT2FS_DINODE_H_
#define _UFS_EXT2FS_EXT2FS_DINODE_H_

#if !defined(_KERNEL) && !defined(_STANDALONE)
#include <stddef.h> /* for offsetof */
#endif

#include <sys/stat.h>

/*
* The root inode is the root of the file system.  Inode 0 can't be used for
* normal purposes and bad blocks are normally linked to inode 1, thus
* the root inode is 2.
* Inode 3 to 10 are reserved in ext2fs.
*/
#define EXT2_BADBLKINO          ((ino_t)1)
#define EXT2_ROOTINO            ((ino_t)2)
#define EXT2_ACLIDXINO          ((ino_t)3)
#define EXT2_ACLDATAINO         ((ino_t)4)
#define EXT2_BOOTLOADERINO      ((ino_t)5)
#define EXT2_UNDELDIRINO        ((ino_t)6)
#define EXT2_RESIZEINO          ((ino_t)7)
#define EXT2_JOURNALINO         ((ino_t)8)
#define EXT2_FIRSTINO           ((ino_t)11)

/*
* A dinode contains all the meta-data associated with a UFS file.
* This structure defines the on-disk format of a dinode. Since
* this structure describes an on-disk structure, all its fields
* are defined by types with precise widths.
*/

/*
* XXX these are the same values as UFS_NDADDR/UFS_NIADDR and it is
* far from clear that there isn't code that relies on them being the
* same.
*/
#define EXT2FS_NDADDR   12              /* Direct addresses in inode. */
#define EXT2FS_NIADDR   3               /* Indirect addresses in inode. */

#define EXT2_MAXSYMLINKLEN ((EXT2FS_NDADDR+EXT2FS_NIADDR) * sizeof (uint32_t))
#define E2MAXSYMLINKLEN EXT2_MAXSYMLINKLEN

struct ext2fs_dinode {
       uint16_t        e2di_mode;      /*   0: IFMT, permissions; see below. */
       uint16_t        e2di_uid;       /*   2: Owner UID */
       uint32_t        e2di_size;      /*   4: Size (in bytes) */
       uint32_t        e2di_atime;     /*   8: Access time */
       uint32_t        e2di_ctime;     /*  12: Create time */
       uint32_t        e2di_mtime;     /*  16: Modification time */
       uint32_t        e2di_dtime;     /*  20: Deletion time */
       uint16_t        e2di_gid;       /*  24: Owner GID */
       uint16_t        e2di_nlink;     /*  26: File link count */
       uint32_t        e2di_nblock;    /*  28: Blocks count */
       uint32_t        e2di_flags;     /*  32: Status flags (chflags) */
       uint32_t        e2di_version;   /*  36: was reserved1 */
       uint32_t        e2di_blocks[EXT2FS_NDADDR+EXT2FS_NIADDR];
                                       /* 40: disk blocks */
       uint32_t        e2di_gen;       /* 100: generation number */
       uint32_t        e2di_facl;      /* 104: file ACL (ext3) */
       uint32_t        e2di_size_high; /* 108: Size (in bytes) high */
       uint32_t        e2di_obso_faddr;/* 112: obsolete fragment address (ext2) */
       uint16_t        e2di_nblock_high; /* 116: Blocks count bits 47:32 (ext4) */
       uint16_t        e2di_facl_high; /* 118: file ACL bits 47:32 (ext4/64bit) */
       uint16_t        e2di_uid_high;  /* 120: Owner UID top 16 bits (ext4) */
       uint16_t        e2di_gid_high;  /* 122: Owner GID top 16 bits (ext4) */
       uint16_t        e2di_checksum_low;  /* 124: crc LE (not implemented) (ext4) */
       uint16_t        e2di_reserved;      /* 126: reserved */
       uint16_t        e2di_extra_isize;   /* 128: inode extra size (over 128) actually used (ext4) */
       uint16_t        e2di_checksum_high; /* 130: crc BE (not implemented) (ext4) */
       uint32_t        e2di_ctime_extra;   /* 132: ctime (nsec << 2 | high epoch) (ext4) */
       uint32_t        e2di_mtime_extra;   /* 136: mtime (nsec << 2 | high epoch) (ext4) */
       uint32_t        e2di_atime_extra;   /* 140: atime (nsec << 2 | high epoch) (ext4) */
       uint32_t        e2di_crtime;        /* 144: creation time (epoch) (ext4) */
       uint32_t        e2di_crtime_extra;  /* 148: creation time (nsec << 2 | high epoch) (ext4) */
       uint32_t        e2di_version_high;  /* 152: version high (ext4) */
       uint32_t        e2di_projid;        /* 156: project id (not implemented) (ext4) */
};

#define i_e2fs_mode             i_din.e2fs_din->e2di_mode
#define i_e2fs_uid              i_din.e2fs_din->e2di_uid
#define i_e2fs_size             i_din.e2fs_din->e2di_size
#define i_e2fs_atime            i_din.e2fs_din->e2di_atime
#define i_e2fs_ctime            i_din.e2fs_din->e2di_ctime
#define i_e2fs_mtime            i_din.e2fs_din->e2di_mtime
#define i_e2fs_dtime            i_din.e2fs_din->e2di_dtime
#define i_e2fs_gid              i_din.e2fs_din->e2di_gid
#define i_e2fs_nlink            i_din.e2fs_din->e2di_nlink
#define i_e2fs_nblock           i_din.e2fs_din->e2di_nblock
#define i_e2fs_flags            i_din.e2fs_din->e2di_flags
#define i_e2fs_version          i_din.e2fs_din->e2di_version
#define i_e2fs_blocks           i_din.e2fs_din->e2di_blocks
#define i_e2fs_rdev             i_din.e2fs_din->e2di_rdev
#define i_e2fs_gen              i_din.e2fs_din->e2di_gen
#define i_e2fs_facl             i_din.e2fs_din->e2di_facl
#define i_e2fs_nblock_high      i_din.e2fs_din->e2di_nblock_high
#define i_e2fs_facl_high        i_din.e2fs_din->e2di_facl_high
#define i_e2fs_uid_high         i_din.e2fs_din->e2di_uid_high
#define i_e2fs_gid_high         i_din.e2fs_din->e2di_gid_high

/* File permissions. */
#define EXT2_IEXEC              0000100         /* Executable. */
#define EXT2_IWRITE             0000200         /* Writable. */
#define EXT2_IREAD              0000400         /* Readable. */
#define EXT2_ISVTX              0001000         /* Sticky bit. */
#define EXT2_ISGID              0002000         /* Set-gid. */
#define EXT2_ISUID              0004000         /* Set-uid. */

/* File types. */
#define EXT2_IFMT               0170000         /* Mask of file type. */
#define EXT2_IFIFO              0010000         /* Named pipe (fifo). */
#define EXT2_IFCHR              0020000         /* Character device. */
#define EXT2_IFDIR              0040000         /* Directory file. */
#define EXT2_IFBLK              0060000         /* Block device. */
#define EXT2_IFREG              0100000         /* Regular file. */
#define EXT2_IFLNK              0120000         /* Symbolic link. */
#define EXT2_IFSOCK             0140000         /* UNIX domain socket. */

/* file flags */
#define EXT2_SECRM              0x00000001 /* Secure deletion */
#define EXT2_UNRM               0x00000002 /* Undelete */
#define EXT2_COMPR              0x00000004 /* Compress file */
#define EXT2_SYNC               0x00000008 /* Synchronous updates */
#define EXT2_IMMUTABLE          0x00000010 /* Immutable file */
#define EXT2_APPEND             0x00000020 /* writes to file may only append */
#define EXT2_NODUMP             0x00000040 /* do not dump file */
#define EXT2_NOATIME            0x00000080 /* do not update atime */
#define EXT2_INDEX              0x00001000 /* hash-indexed directory */
#define EXT2_IMAGIC             0x00002000 /* AFS directory */
#define EXT2_JOURNAL_DATA       0x00004000 /* file data should be journaled */
#define EXT2_NOTAIL             0x00008000 /* file tail should not be merged */
#define EXT2_DIRSYNC            0x00010000 /* dirsync behaviour */
#define EXT2_TOPDIR             0x00020000 /* Top of directory hierarchies*/
#define EXT2_HUGE_FILE          0x00040000 /* Set to each huge file */
#define EXT2_EXTENTS            0x00080000 /* Inode uses extents */
#define EXT2_EA_INODE           0x00200000 /* Inode used for large EA */
#define EXT2_EOFBLOCKS          0x00400000 /* Blocks allocated beyond EOF */
#define EXT2_INLINE_DATA        0x10000000 /* Inode has inline data */
#define EXT2_PROJINHERIT        0x20000000 /* Children inherit project ID */

/* Size of on-disk inode. */
#define EXT2_REV0_DINODE_SIZE   128U
#define EXT2_DINODE_SIZE(fs)    ((fs)->e2fs.e2fs_rev > E2FS_REV0 ?      \
                                   (fs)->e2fs.e2fs_inode_size :        \
                                   EXT2_REV0_DINODE_SIZE)
#define EXT2_DINODE_FITS(dinode, field, isize) (\
       (isize > EXT2_REV0_DINODE_SIZE) \
       && ((EXT2_REV0_DINODE_SIZE + (dinode)->e2di_extra_isize)  >= offsetof(struct ext2fs_dinode, field) + sizeof((dinode)->field)) \
       )

/*
* Time encoding
* Lower two bits of extra field are extra high bits for epoch; unfortunately still, Linux kernels treat 11 there as 00 for compatibility
* Rest of extra fields are nanoseconds
*/
static __inline void
ext2fs_dinode_time_get(struct timespec *ts, uint32_t epoch, uint32_t extra)
{
       ts->tv_sec = (signed) epoch;

       if (extra) {
               uint64_t epoch_bits = extra & 0x3;
               /* XXX compatibility with linux kernel < 4.20 */
               if (epoch_bits == 3 && ts->tv_sec < 0)
                       epoch_bits = 0;

               ts->tv_sec |= epoch_bits << 32;

               ts->tv_nsec = extra >> 2;
       } else {
               ts->tv_nsec = 0;
       }
}
#define EXT2_DINODE_TIME_GET(ts, dinode, field, isize) \
       ext2fs_dinode_time_get(ts, (dinode)->field, \
               EXT2_DINODE_FITS(dinode, field ## _extra, isize) \
                       ? (dinode)->field ## _extra : 0 \
       )

static __inline void
ext2fs_dinode_time_set(const struct timespec *ts, uint32_t *epoch, uint32_t *extra)
{
       *epoch = (int32_t) ts->tv_sec;

       if (extra) {
               uint32_t epoch_bits = (ts->tv_sec >> 32) & 0x3;

               *extra = (ts->tv_nsec << 2) | epoch_bits;
       }
}
#define EXT2_DINODE_TIME_SET(ts, dinode, field, isize) \
       ext2fs_dinode_time_set(ts, &(dinode)->field, \
               EXT2_DINODE_FITS(dinode, field ## _extra, isize) \
                       ? &(dinode)->field ## _extra : NULL \
       )

/*
* The e2di_blocks fields may be overlaid with other information for
* file types that do not have associated disk storage. Block
* and character devices overlay the first data block with their
* dev_t value. Short symbolic links place their path in the
* di_db area.
*/

#define e2di_rdev               e2di_blocks[0]
#define e2di_shortlink          e2di_blocks

/* e2fs needs byte swapping on big-endian systems */
#if BYTE_ORDER == LITTLE_ENDIAN
#       define e2fs_iload(old, new, isize)      \
               memcpy((new),(old),(isize))
#       define e2fs_isave(old, new, isize)      \
               memcpy((new),(old),(isize))
#else
void e2fs_i_bswap(struct ext2fs_dinode *, struct ext2fs_dinode *, size_t);
#       define e2fs_iload(old, new, isize) e2fs_i_bswap((old), (new), (isize))
#       define e2fs_isave(old, new, isize) e2fs_i_bswap((old), (new), (isize))
#endif

#endif /* !_UFS_EXT2FS_EXT2FS_DINODE_H_ */

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