/*-
 *  modified for EXT2FS support in Lites 1.1
 *
 *  Aug 1995, Godmar Back (gback@cs.utah.edu)
 *  University of Utah, Department of Computer Science
 */
/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2009 Aditya Sarawgi
 * 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.
 * 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 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 _FS_EXT2FS_EXT2FS_H_
#define _FS_EXT2FS_EXT2FS_H_

#include <sys/types.h>

/*
 * Super block for an ext2fs file system.
 */
struct ext2fs {
        uint32_t  e2fs_icount;          /* Inode count */
        uint32_t  e2fs_bcount;          /* blocks count */
        uint32_t  e2fs_rbcount;         /* reserved blocks count */
        uint32_t  e2fs_fbcount;         /* free blocks count */
        uint32_t  e2fs_ficount;         /* free inodes count */
        uint32_t  e2fs_first_dblock;    /* first data block */
        uint32_t  e2fs_log_bsize;       /* block size = 1024*(2^e2fs_log_bsize) */
        uint32_t  e2fs_log_fsize;       /* fragment size */
        uint32_t  e2fs_bpg;             /* blocks per group */
        uint32_t  e2fs_fpg;             /* frags per group */
        uint32_t  e2fs_ipg;             /* inodes per group */
        uint32_t  e2fs_mtime;           /* mount time */
        uint32_t  e2fs_wtime;           /* write time */
        uint16_t  e2fs_mnt_count;       /* mount count */
        uint16_t  e2fs_max_mnt_count;   /* max mount count */
        uint16_t  e2fs_magic;           /* magic number */
        uint16_t  e2fs_state;           /* file system state */
        uint16_t  e2fs_beh;             /* behavior on errors */
        uint16_t  e2fs_minrev;          /* minor revision level */
        uint32_t  e2fs_lastfsck;        /* time of last fsck */
        uint32_t  e2fs_fsckintv;        /* max time between fscks */
        uint32_t  e2fs_creator;         /* creator OS */
        uint32_t  e2fs_rev;             /* revision level */
        uint16_t  e2fs_ruid;            /* default uid for reserved blocks */
        uint16_t  e2fs_rgid;            /* default gid for reserved blocks */
        /* EXT2_DYNAMIC_REV superblocks */
        uint32_t  e2fs_first_ino;       /* first non-reserved inode */
        uint16_t  e2fs_inode_size;      /* size of inode structure */
        uint16_t  e2fs_block_group_nr;  /* block grp number of this sblk*/
        uint32_t  e2fs_features_compat; /* compatible feature set */
        uint32_t  e2fs_features_incompat; /* incompatible feature set */
        uint32_t  e2fs_features_rocompat; /* RO-compatible feature set */
        uint8_t   e2fs_uuid[16];        /* 128-bit uuid for volume */
        char      e2fs_vname[16];       /* volume name */
        char      e2fs_fsmnt[64];       /* name mounted on */
        uint32_t  e2fs_algo;            /* For compression */
        uint8_t   e2fs_prealloc;        /* # of blocks for old prealloc */
        uint8_t   e2fs_dir_prealloc;    /* # of blocks for old prealloc dirs */
        uint16_t  e2fs_reserved_ngdb;   /* # of reserved gd blocks for resize */
        char      e3fs_journal_uuid[16]; /* uuid of journal superblock */
        uint32_t  e3fs_journal_inum;    /* inode number of journal file */
        uint32_t  e3fs_journal_dev;     /* device number of journal file */
        uint32_t  e3fs_last_orphan;     /* start of list of inodes to delete */
        uint32_t  e3fs_hash_seed[4];    /* HTREE hash seed */
        char      e3fs_def_hash_version;/* Default hash version to use */
        char      e3fs_jnl_backup_type;
        uint16_t  e3fs_desc_size;       /* size of group descriptor */
        uint32_t  e3fs_default_mount_opts;
        uint32_t  e3fs_first_meta_bg;   /* First metablock block group */
        uint32_t  e3fs_mkfs_time;       /* when the fs was created */
        uint32_t  e3fs_jnl_blks[17];    /* backup of the journal inode */
        uint32_t  e4fs_bcount_hi;       /* high bits of blocks count */
        uint32_t  e4fs_rbcount_hi;      /* high bits of reserved blocks count */
        uint32_t  e4fs_fbcount_hi;      /* high bits of free blocks count */
        uint16_t  e4fs_min_extra_isize; /* all inodes have some bytes */
        uint16_t  e4fs_want_extra_isize;/* inodes must reserve some bytes */
        uint32_t  e4fs_flags;           /* miscellaneous flags */
        uint16_t  e4fs_raid_stride;     /* RAID stride */
        uint16_t  e4fs_mmpintv;         /* seconds to wait in MMP checking */
        uint64_t  e4fs_mmpblk;          /* block for multi-mount protection */
        uint32_t  e4fs_raid_stripe_wid; /* blocks on data disks (N * stride) */
        uint8_t   e4fs_log_gpf;         /* FLEX_BG group size */
        uint8_t   e4fs_chksum_type;     /* metadata checksum algorithm used */
        uint8_t   e4fs_encrypt;         /* versioning level for encryption */
        uint8_t   e4fs_reserved_pad;
        uint64_t  e4fs_kbytes_written;  /* number of lifetime kilobytes */
        uint32_t  e4fs_snapinum;        /* inode number of active snapshot */
        uint32_t  e4fs_snapid;          /* sequential ID of active snapshot */
        uint64_t  e4fs_snaprbcount;     /* reserved blocks for active snapshot */
        uint32_t  e4fs_snaplist;        /* inode number for on-disk snapshot */
        uint32_t  e4fs_errcount;        /* number of file system errors */
        uint32_t  e4fs_first_errtime;   /* first time an error happened */
        uint32_t  e4fs_first_errino;    /* inode involved in first error */
        uint64_t  e4fs_first_errblk;    /* block involved of first error */
        uint8_t   e4fs_first_errfunc[32];/* function where error happened */
        uint32_t  e4fs_first_errline;   /* line number where error happened */
        uint32_t  e4fs_last_errtime;    /* most recent time of an error */
        uint32_t  e4fs_last_errino;     /* inode involved in last error */
        uint32_t  e4fs_last_errline;    /* line number where error happened */
        uint64_t  e4fs_last_errblk;     /* block involved of last error */
        uint8_t   e4fs_last_errfunc[32]; /* function where error happened */
        uint8_t   e4fs_mount_opts[64];
        uint32_t  e4fs_usrquota_inum;   /* inode for tracking user quota */
        uint32_t  e4fs_grpquota_inum;   /* inode for tracking group quota */
        uint32_t  e4fs_overhead_clusters;/* overhead blocks/clusters */
        uint32_t  e4fs_backup_bgs[2];   /* groups with sparse_super2 SBs */
        uint8_t   e4fs_encrypt_algos[4];/* encryption algorithms in use */
        uint8_t   e4fs_encrypt_pw_salt[16];/* salt used for string2key */
        uint32_t  e4fs_lpf_ino;         /* location of the lost+found inode */
        uint32_t  e4fs_proj_quota_inum; /* inode for tracking project quota */
        uint32_t  e4fs_chksum_seed;     /* checksum seed */
        uint32_t  e4fs_reserved[98];    /* padding to the end of the block */
        uint32_t  e4fs_sbchksum;        /* superblock checksum */
};

/*
 * The path name on which the file system is mounted is maintained
 * in fs_fsmnt. MAXMNTLEN defines the amount of space allocated in
 * the super block for this name.
 */
#define MAXMNTLEN 512

/*
 * In-Memory Superblock
 */

struct m_ext2fs {
        struct ext2fs * e2fs;
        char     e2fs_fsmnt[MAXMNTLEN];/* name mounted on */
        char     e2fs_ronly;      /* mounted read-only flag */
        char     e2fs_fmod;       /* super block modified flag */
        uint64_t e2fs_bcount;     /* blocks count */
        uint64_t e2fs_rbcount;    /* reserved blocks count */
        uint64_t e2fs_fbcount;    /* free blocks count */
        uint32_t e2fs_ficount;    /* free inodes count */
        uint32_t e2fs_bsize;      /* Block size */
        uint32_t e2fs_bshift;     /* calc of logical block no */
        uint32_t e2fs_bpg;        /* Number of blocks per group */
        int64_t  e2fs_qbmask;     /* = s_blocksize -1 */
        uint32_t e2fs_fsbtodb;    /* Shift to get disk block */
        uint32_t e2fs_ipg;        /* Number of inodes per group */
        uint32_t e2fs_ipb;        /* Number of inodes per block */
        uint32_t e2fs_itpg;       /* Number of inode table per group */
        uint32_t e2fs_fsize;      /* Size of fragments per block */
        uint32_t e2fs_fpb;        /* Number of fragments per block */
        uint32_t e2fs_fpg;        /* Number of fragments per group */
        uint32_t e2fs_gdbcount;   /* Number of group descriptors */
        uint32_t e2fs_gcount;     /* Number of groups */
        uint32_t e2fs_isize;      /* Size of inode */
        uint32_t e2fs_total_dir;  /* Total number of directories */
        uint8_t *e2fs_contigdirs; /* (u) # of contig. allocated dirs */
        char     e2fs_wasvalid;   /* valid at mount time */
        off_t    e2fs_maxfilesize;
        struct   ext2_gd *e2fs_gd; /* Group Descriptors */
        int32_t  e2fs_contigsumsize;    /* size of cluster summary array */
        int32_t *e2fs_maxcluster;       /* max cluster in each cyl group */
        struct   csum *e2fs_clustersum; /* cluster summary in each cyl group */
        int32_t  e2fs_uhash;      /* 3 if hash should be signed, 0 if not */
        uint32_t e2fs_csum_seed;  /* sb checksum seed */
        uint64_t e2fs_maxsymlinklen; /* max size of short symlink */
};

/* cluster summary information */

struct csum {
        int8_t   cs_init; /* cluster summary has been initialized */
        int32_t *cs_sum;  /* cluster summary array */
};

/*
 * The second extended file system magic number
 */
#define E2FS_MAGIC              0xEF53

/*
 * Revision levels
 */
#define E2FS_REV0               0       /* The good old (original) format */
#define E2FS_REV1               1       /* V2 format w/ dynamic inode sizes */

#define E2FS_REV0_INODE_SIZE 128

/*
 * Metadata checksum algorithm codes
 */
#define EXT4_CRC32C_CHKSUM              1

/*
 * compatible/incompatible features
 */
#define EXT2F_COMPAT_PREALLOC           0x0001
#define EXT2F_COMPAT_IMAGIC_INODES      0x0002
#define EXT2F_COMPAT_HASJOURNAL         0x0004
#define EXT2F_COMPAT_EXT_ATTR           0x0008
#define EXT2F_COMPAT_RESIZE             0x0010
#define EXT2F_COMPAT_DIRHASHINDEX       0x0020
#define EXT2F_COMPAT_LAZY_BG            0x0040
#define EXT2F_COMPAT_EXCLUDE_BITMAP     0x0100
#define EXT2F_COMPAT_SPARSESUPER2       0x0200

#define EXT2F_ROCOMPAT_SPARSESUPER      0x0001
#define EXT2F_ROCOMPAT_LARGEFILE        0x0002
#define EXT2F_ROCOMPAT_BTREE_DIR        0x0004
#define EXT2F_ROCOMPAT_HUGE_FILE        0x0008
#define EXT2F_ROCOMPAT_GDT_CSUM         0x0010
#define EXT2F_ROCOMPAT_DIR_NLINK        0x0020
#define EXT2F_ROCOMPAT_EXTRA_ISIZE      0x0040
#define EXT2F_ROCOMPAT_HAS_SNAPSHOT     0x0080
#define EXT2F_ROCOMPAT_QUOTA            0x0100
#define EXT2F_ROCOMPAT_BIGALLOC         0x0200
#define EXT2F_ROCOMPAT_METADATA_CKSUM   0x0400
#define EXT2F_ROCOMPAT_REPLICA          0x0800
#define EXT2F_ROCOMPAT_READONLY         0x1000
#define EXT2F_ROCOMPAT_PROJECT          0x2000

#define EXT2F_INCOMPAT_COMP             0x0001
#define EXT2F_INCOMPAT_FTYPE            0x0002
#define EXT2F_INCOMPAT_RECOVER          0x0004
#define EXT2F_INCOMPAT_JOURNAL_DEV      0x0008
#define EXT2F_INCOMPAT_META_BG          0x0010
#define EXT2F_INCOMPAT_EXTENTS          0x0040
#define EXT2F_INCOMPAT_64BIT            0x0080
#define EXT2F_INCOMPAT_MMP              0x0100
#define EXT2F_INCOMPAT_FLEX_BG          0x0200
#define EXT2F_INCOMPAT_EA_INODE         0x0400
#define EXT2F_INCOMPAT_DIRDATA          0x1000
#define EXT2F_INCOMPAT_CSUM_SEED        0x2000
#define EXT2F_INCOMPAT_LARGEDIR         0x4000
#define EXT2F_INCOMPAT_INLINE_DATA      0x8000
#define EXT2F_INCOMPAT_ENCRYPT          0x10000

struct ext2_feature
{
        int mask;
        const char *name;
};

static const struct ext2_feature compat[] = {
        { EXT2F_COMPAT_PREALLOC,       "dir_prealloc"    },
        { EXT2F_COMPAT_IMAGIC_INODES,  "imagic_inodes"   },
        { EXT2F_COMPAT_HASJOURNAL,     "has_journal"     },
        { EXT2F_COMPAT_EXT_ATTR,       "ext_attr"        },
        { EXT2F_COMPAT_RESIZE,         "resize_inode"    },
        { EXT2F_COMPAT_DIRHASHINDEX,   "dir_index"       },
        { EXT2F_COMPAT_EXCLUDE_BITMAP, "snapshot_bitmap" },
        { EXT2F_COMPAT_SPARSESUPER2,   "sparse_super2"   }
};

static const struct ext2_feature ro_compat[] = {
        { EXT2F_ROCOMPAT_SPARSESUPER,    "sparse_super"  },
        { EXT2F_ROCOMPAT_LARGEFILE,      "large_file"    },
        { EXT2F_ROCOMPAT_BTREE_DIR,      "btree_dir"     },
        { EXT2F_ROCOMPAT_HUGE_FILE,      "huge_file"     },
        { EXT2F_ROCOMPAT_GDT_CSUM,       "uninit_groups" },
        { EXT2F_ROCOMPAT_DIR_NLINK,      "dir_nlink"     },
        { EXT2F_ROCOMPAT_EXTRA_ISIZE,    "extra_isize"   },
        { EXT2F_ROCOMPAT_HAS_SNAPSHOT,   "snapshot"      },
        { EXT2F_ROCOMPAT_QUOTA,          "quota"         },
        { EXT2F_ROCOMPAT_BIGALLOC,       "bigalloc"      },
        { EXT2F_ROCOMPAT_METADATA_CKSUM, "metadata_csum" },
        { EXT2F_ROCOMPAT_REPLICA,        "replica"       },
        { EXT2F_ROCOMPAT_READONLY,       "ro"            },
        { EXT2F_ROCOMPAT_PROJECT,        "project"       }
};

static const struct ext2_feature incompat[] = {
        { EXT2F_INCOMPAT_COMP,        "compression"        },
        { EXT2F_INCOMPAT_FTYPE,       "filetype"           },
        { EXT2F_INCOMPAT_RECOVER,     "needs_recovery"     },
        { EXT2F_INCOMPAT_JOURNAL_DEV, "journal_dev"        },
        { EXT2F_INCOMPAT_META_BG,     "meta_bg"            },
        { EXT2F_INCOMPAT_EXTENTS,     "extents"            },
        { EXT2F_INCOMPAT_64BIT,       "64bit"              },
        { EXT2F_INCOMPAT_MMP,         "mmp"                },
        { EXT2F_INCOMPAT_FLEX_BG,     "flex_bg"            },
        { EXT2F_INCOMPAT_EA_INODE,    "ea_inode"           },
        { EXT2F_INCOMPAT_DIRDATA,     "dirdata"            },
        { EXT2F_INCOMPAT_CSUM_SEED,   "metadata_csum_seed" },
        { EXT2F_INCOMPAT_LARGEDIR,    "large_dir"          },
        { EXT2F_INCOMPAT_INLINE_DATA, "inline_data"        },
        { EXT2F_INCOMPAT_ENCRYPT,     "encrypt"            }
};

/*
 * Features supported in this implementation
 *
 * We support the following REV1 features:
 * - EXT2F_ROCOMPAT_SPARSESUPER
 * - EXT2F_ROCOMPAT_LARGEFILE
 * - EXT2F_ROCOMPAT_EXTRA_ISIZE
 * - EXT2F_INCOMPAT_FTYPE
 *
 * We partially (read-only) support the following EXT4 features:
 * - EXT2F_ROCOMPAT_HUGE_FILE
 * - EXT2F_INCOMPAT_EXTENTS
 *
 */
#define EXT2F_COMPAT_SUPP               EXT2F_COMPAT_DIRHASHINDEX
#define EXT2F_ROCOMPAT_SUPP             (EXT2F_ROCOMPAT_SPARSESUPER | \
                                         EXT2F_ROCOMPAT_LARGEFILE | \
                                         EXT2F_ROCOMPAT_GDT_CSUM | \
                                         EXT2F_ROCOMPAT_METADATA_CKSUM | \
                                         EXT2F_ROCOMPAT_DIR_NLINK | \
                                         EXT2F_ROCOMPAT_HUGE_FILE | \
                                         EXT2F_ROCOMPAT_EXTRA_ISIZE)
#define EXT2F_INCOMPAT_SUPP             (EXT2F_INCOMPAT_FTYPE | \
                                         EXT2F_INCOMPAT_META_BG | \
                                         EXT2F_INCOMPAT_EXTENTS | \
                                         EXT2F_INCOMPAT_64BIT | \
                                         EXT2F_INCOMPAT_FLEX_BG | \
                                         EXT2F_INCOMPAT_CSUM_SEED)

/* Assume that user mode programs are passing in an ext2fs superblock, not
 * a kernel struct super_block.  This will allow us to call the feature-test
 * macros from user land. */
#define EXT2_SB(sb)     (sb)

/*
 * Feature set definitions
 */
#define EXT2_HAS_COMPAT_FEATURE(sb,mask)                        \
        ( le32toh(EXT2_SB(sb)->e2fs->e2fs_features_compat) & mask)
#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask)                     \
        ( le32toh(EXT2_SB(sb)->e2fs->e2fs_features_rocompat) & mask)
#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask)                      \
        ( le32toh(EXT2_SB(sb)->e2fs->e2fs_features_incompat) & mask)

/*
 * File clean flags
 */
#define E2FS_ISCLEAN                    0x0001  /* Unmounted cleanly */
#define E2FS_ERRORS                     0x0002  /* Errors detected */

/*
 * Filesystem miscellaneous flags
 */
#define E2FS_SIGNED_HASH        0x0001
#define E2FS_UNSIGNED_HASH      0x0002

#define EXT2_BG_INODE_UNINIT    0x0001  /* Inode table/bitmap not in use */
#define EXT2_BG_BLOCK_UNINIT    0x0002  /* Block bitmap not in use */
#define EXT2_BG_INODE_ZEROED    0x0004  /* On-disk itable initialized to zero */

/* ext2 file system block group descriptor */

struct ext2_gd {
        uint32_t ext2bgd_b_bitmap;      /* blocks bitmap block */
        uint32_t ext2bgd_i_bitmap;      /* inodes bitmap block */
        uint32_t ext2bgd_i_tables;      /* inodes table block  */
        uint16_t ext2bgd_nbfree;        /* number of free blocks */
        uint16_t ext2bgd_nifree;        /* number of free inodes */
        uint16_t ext2bgd_ndirs;         /* number of directories */
        uint16_t ext4bgd_flags;         /* block group flags */
        uint32_t ext4bgd_x_bitmap;      /* snapshot exclusion bitmap loc. */
        uint16_t ext4bgd_b_bmap_csum;   /* block bitmap checksum */
        uint16_t ext4bgd_i_bmap_csum;   /* inode bitmap checksum */
        uint16_t ext4bgd_i_unused;      /* unused inode count */
        uint16_t ext4bgd_csum;          /* group descriptor checksum */
        uint32_t ext4bgd_b_bitmap_hi;   /* high bits of blocks bitmap block */
        uint32_t ext4bgd_i_bitmap_hi;   /* high bits of inodes bitmap block */
        uint32_t ext4bgd_i_tables_hi;   /* high bits of inodes table block */
        uint16_t ext4bgd_nbfree_hi;     /* high bits of number of free blocks */
        uint16_t ext4bgd_nifree_hi;     /* high bits of number of free inodes */
        uint16_t ext4bgd_ndirs_hi;      /* high bits of number of directories */
        uint16_t ext4bgd_i_unused_hi;   /* high bits of unused inode count */
        uint32_t ext4bgd_x_bitmap_hi;   /* high bits of snapshot exclusion */
        uint16_t ext4bgd_b_bmap_csum_hi;/* high bits of block bitmap checksum */
        uint16_t ext4bgd_i_bmap_csum_hi;/* high bits of inode bitmap checksum */
        uint32_t ext4bgd_reserved;
};

#define E2FS_REV0_GD_SIZE (sizeof(struct ext2_gd) / 2)
#define E2FS_64BIT_GD_SIZE (sizeof(struct ext2_gd))

/*
 * Macro-instructions used to manage several block sizes
 */
#define EXT2_MIN_BLOCK_LOG_SIZE           10
#define EXT2_BLOCK_SIZE(s)              ((s)->e2fs_bsize)
#define EXT2_ADDR_PER_BLOCK(s)          (EXT2_BLOCK_SIZE(s) / sizeof(uint32_t))
#define EXT2_INODE_SIZE(s)              (EXT2_SB(s)->e2fs_isize)

/*
 * Macro-instructions used to manage fragments
 */
#define EXT2_MIN_FRAG_SIZE              1024
#define EXT2_MIN_FRAG_LOG_SIZE          10
#define EXT2_MAX_FRAG_LOG_SIZE          30
#define EXT2_FRAG_SIZE(s)               (EXT2_SB(s)->e2fs_fsize)
#define EXT2_FRAGS_PER_BLOCK(s)         (EXT2_SB(s)->e2fs_fpb)

/*
 * Macro-instructions used to manage group descriptors
 */
#define EXT2_BLOCKS_PER_GROUP(s)        (EXT2_SB(s)->e2fs_bpg)
#define EXT2_DESCS_PER_BLOCK(s)         (EXT2_HAS_INCOMPAT_FEATURE((s),  \
    EXT2F_INCOMPAT_64BIT) ? ((s)->e2fs_bsize / sizeof(struct ext2_gd)) : \
    ((s)->e2fs_bsize / E2FS_REV0_GD_SIZE))

/*
 * Macro-instructions used to manage inodes
 */
#define EXT2_FIRST_INO(s)       (le32toh((EXT2_SB(s)->e2fs->e2fs_rev) == \
    E2FS_REV0) ? EXT2_FIRSTINO : le32toh(EXT2_SB(s)->e2fs->e2fs_first_ino))

/*
 * Linux major/minor values limits
 */
#define EXT2_MINORBITS  (20)
#define EXT2_MAJOR_MAX  (0xffffffff >> EXT2_MINORBITS)
#define EXT2_MINOR_MAX  ((1 << EXT2_MINORBITS) - 1)

#endif  /* !_FS_EXT2FS_EXT2FS_H_ */