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/*

 *  linux/include/linux/ext3_fs.h

 *

 * Copyright (C) 1992, 1993, 1994, 1995

 * Remy Card (card@masi.ibp.fr)

 * Laboratoire MASI - Institut Blaise Pascal

 * Universite Pierre et Marie Curie (Paris VI)

 *

 *  from

 *

 *  linux/include/linux/minix_fs.h

 *

 *  Copyright (C) 1991, 1992  Linus Torvalds

 */

#ifndef _LINUX_EXT3_FS_H

#define _LINUX_EXT3_FS_H

#include <linux/types.h>

#include <linux/magic.h>

/*

 * The second extended filesystem constants/structures

 */

/*

 * Define EXT3FS_DEBUG to produce debug messages

 */

#undef EXT3FS_DEBUG

/*

 * Define EXT3_RESERVATION to reserve data blocks for expanding files

 */

#define EXT3_DEFAULT_RESERVE_BLOCKS     8

/*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */

#define EXT3_MAX_RESERVE_BLOCKS         1027

#define EXT3_RESERVE_WINDOW_NOT_ALLOCATED 0

/*

 * Debug code

 */

#ifdef EXT3FS_DEBUG

#define ext3_debug(f, a...)                                             \

        do {                                                            \

                printk (KERN_DEBUG "EXT3-fs DEBUG (%s, %d): %s:",       \

                        __FILE__, __LINE__, __FUNCTION__);              \

                printk (KERN_DEBUG f, ## a);                            \

        } while (0)

#else

#define ext3_debug(f, a...)     do {} while (0)

#endif

/*

 * Special inodes numbers

 */

#define EXT3_BAD_INO             1      /* Bad blocks inode */

#define EXT3_ROOT_INO            2      /* Root inode */

#define EXT3_BOOT_LOADER_INO     5      /* Boot loader inode */

#define EXT3_UNDEL_DIR_INO       6      /* Undelete directory inode */

#define EXT3_RESIZE_INO          7      /* Reserved group descriptors inode */

#define EXT3_JOURNAL_INO         8      /* Journal inode */

/* First non-reserved inode for old ext3 filesystems */

#define EXT3_GOOD_OLD_FIRST_INO 11

/*

 * Maximal count of links to a file

 */

#define EXT3_LINK_MAX           32000

/*

 * Macro-instructions used to manage several block sizes

 */

#define EXT3_MIN_BLOCK_SIZE             1024

#define EXT3_MAX_BLOCK_SIZE             65536

#define EXT3_MIN_BLOCK_LOG_SIZE         10

#ifdef __KERNEL__

# define EXT3_BLOCK_SIZE(s)             ((s)->s_blocksize)

#else

# define EXT3_BLOCK_SIZE(s)             (EXT3_MIN_BLOCK_SIZE << (s)->s_log_block_size)

#endif

#define EXT3_ADDR_PER_BLOCK(s)          (EXT3_BLOCK_SIZE(s) / sizeof (__u32))

#ifdef __KERNEL__

# define EXT3_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)

#else

# define EXT3_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)

#endif

#ifdef __KERNEL__

#define EXT3_ADDR_PER_BLOCK_BITS(s)     (EXT3_SB(s)->s_addr_per_block_bits)

#define EXT3_INODE_SIZE(s)              (EXT3_SB(s)->s_inode_size)

#define EXT3_FIRST_INO(s)               (EXT3_SB(s)->s_first_ino)

#else

#define EXT3_INODE_SIZE(s)      (((s)->s_rev_level == EXT3_GOOD_OLD_REV) ? \

                                 EXT3_GOOD_OLD_INODE_SIZE : \

                                 (s)->s_inode_size)

#define EXT3_FIRST_INO(s)       (((s)->s_rev_level == EXT3_GOOD_OLD_REV) ? \

                                 EXT3_GOOD_OLD_FIRST_INO : \

                                 (s)->s_first_ino)

#endif

/*

 * Macro-instructions used to manage fragments

 */

#define EXT3_MIN_FRAG_SIZE              1024

#define EXT3_MAX_FRAG_SIZE              4096

#define EXT3_MIN_FRAG_LOG_SIZE            10

#ifdef __KERNEL__

# define EXT3_FRAG_SIZE(s)              (EXT3_SB(s)->s_frag_size)

# define EXT3_FRAGS_PER_BLOCK(s)        (EXT3_SB(s)->s_frags_per_block)

#else

# define EXT3_FRAG_SIZE(s)              (EXT3_MIN_FRAG_SIZE << (s)->s_log_frag_size)

# define EXT3_FRAGS_PER_BLOCK(s)        (EXT3_BLOCK_SIZE(s) / EXT3_FRAG_SIZE(s))

#endif

/*

 * Structure of a blocks group descriptor

 */

struct ext3_group_desc

{

        __le32  bg_block_bitmap;                /* Blocks bitmap block */

        __le32  bg_inode_bitmap;                /* Inodes bitmap block */

        __le32  bg_inode_table;         /* Inodes table block */

        __le16  bg_free_blocks_count;   /* Free blocks count */

        __le16  bg_free_inodes_count;   /* Free inodes count */

        __le16  bg_used_dirs_count;     /* Directories count */

        __u16   bg_pad;

        __le32  bg_reserved[3];

};

/*

 * Macro-instructions used to manage group descriptors

 */

#ifdef __KERNEL__

# define EXT3_BLOCKS_PER_GROUP(s)       (EXT3_SB(s)->s_blocks_per_group)

# define EXT3_DESC_PER_BLOCK(s)         (EXT3_SB(s)->s_desc_per_block)

# define EXT3_INODES_PER_GROUP(s)       (EXT3_SB(s)->s_inodes_per_group)

# define EXT3_DESC_PER_BLOCK_BITS(s)    (EXT3_SB(s)->s_desc_per_block_bits)

#else

# define EXT3_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)

# define EXT3_DESC_PER_BLOCK(s)         (EXT3_BLOCK_SIZE(s) / sizeof (struct ext3_group_desc))

# define EXT3_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)

#endif

/*

 * Constants relative to the data blocks

 */

#define EXT3_NDIR_BLOCKS                12

#define EXT3_IND_BLOCK                  EXT3_NDIR_BLOCKS

#define EXT3_DIND_BLOCK                 (EXT3_IND_BLOCK + 1)

#define EXT3_TIND_BLOCK                 (EXT3_DIND_BLOCK + 1)

#define EXT3_N_BLOCKS                   (EXT3_TIND_BLOCK + 1)

/*

 * Inode flags

 */

#define EXT3_SECRM_FL                   0x00000001 /* Secure deletion */

#define EXT3_UNRM_FL                    0x00000002 /* Undelete */

#define EXT3_COMPR_FL                   0x00000004 /* Compress file */

#define EXT3_SYNC_FL                    0x00000008 /* Synchronous updates */

#define EXT3_IMMUTABLE_FL               0x00000010 /* Immutable file */

#define EXT3_APPEND_FL                  0x00000020 /* writes to file may only append */

#define EXT3_NODUMP_FL                  0x00000040 /* do not dump file */

#define EXT3_NOATIME_FL                 0x00000080 /* do not update atime */

/* Reserved for compression usage... */

#define EXT3_DIRTY_FL                   0x00000100

#define EXT3_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */

#define EXT3_NOCOMPR_FL                 0x00000400 /* Don't compress */

#define EXT3_ECOMPR_FL                  0x00000800 /* Compression error */

/* End compression flags --- maybe not all used */

#define EXT3_INDEX_FL                   0x00001000 /* hash-indexed directory */

#define EXT3_IMAGIC_FL                  0x00002000 /* AFS directory */

#define EXT3_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */

#define EXT3_NOTAIL_FL                  0x00008000 /* file tail should not be merged */

#define EXT3_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */

#define EXT3_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/

#define EXT3_RESERVED_FL                0x80000000 /* reserved for ext3 lib */

#define EXT3_FL_USER_VISIBLE            0x0003DFFF /* User visible flags */

#define EXT3_FL_USER_MODIFIABLE         0x000380FF /* User modifiable flags */

/*

 * Inode dynamic state flags

 */

#define EXT3_STATE_JDATA                0x00000001 /* journaled data exists */

#define EXT3_STATE_NEW                  0x00000002 /* inode is newly created */

#define EXT3_STATE_XATTR                0x00000004 /* has in-inode xattrs */

/* Used to pass group descriptor data when online resize is done */

struct ext3_new_group_input {

        __u32 group;            /* Group number for this data */

        __u32 block_bitmap;     /* Absolute block number of block bitmap */

        __u32 inode_bitmap;     /* Absolute block number of inode bitmap */

        __u32 inode_table;      /* Absolute block number of inode table start */

        __u32 blocks_count;     /* Total number of blocks in this group */

        __u16 reserved_blocks;  /* Number of reserved blocks in this group */

        __u16 unused;

};

/* The struct ext3_new_group_input in kernel space, with free_blocks_count */

struct ext3_new_group_data {

        __u32 group;

        __u32 block_bitmap;

        __u32 inode_bitmap;

        __u32 inode_table;

        __u32 blocks_count;

        __u16 reserved_blocks;

        __u16 unused;

        __u32 free_blocks_count;

};

/*

 * ioctl commands

 */

#define EXT3_IOC_GETFLAGS               FS_IOC_GETFLAGS

#define EXT3_IOC_SETFLAGS               FS_IOC_SETFLAGS

#define EXT3_IOC_GETVERSION             _IOR('f', 3, long)

#define EXT3_IOC_SETVERSION             _IOW('f', 4, long)

#define EXT3_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)

#define EXT3_IOC_GROUP_ADD              _IOW('f', 8,struct ext3_new_group_input)

#define EXT3_IOC_GETVERSION_OLD         FS_IOC_GETVERSION

#define EXT3_IOC_SETVERSION_OLD         FS_IOC_SETVERSION

#ifdef CONFIG_JBD_DEBUG

#define EXT3_IOC_WAIT_FOR_READONLY      _IOR('f', 99, long)

#endif

#define EXT3_IOC_GETRSVSZ               _IOR('f', 5, long)

#define EXT3_IOC_SETRSVSZ               _IOW('f', 6, long)

/*

 * ioctl commands in 32 bit emulation

 */

#define EXT3_IOC32_GETFLAGS             FS_IOC32_GETFLAGS

#define EXT3_IOC32_SETFLAGS             FS_IOC32_SETFLAGS

#define EXT3_IOC32_GETVERSION           _IOR('f', 3, int)

#define EXT3_IOC32_SETVERSION           _IOW('f', 4, int)

#define EXT3_IOC32_GETRSVSZ             _IOR('f', 5, int)

#define EXT3_IOC32_SETRSVSZ             _IOW('f', 6, int)

#define EXT3_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)

#ifdef CONFIG_JBD_DEBUG

#define EXT3_IOC32_WAIT_FOR_READONLY    _IOR('f', 99, int)

#endif

#define EXT3_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION

#define EXT3_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION

/*

 *  Mount options

 */

struct ext3_mount_options {

        unsigned long s_mount_opt;

        uid_t s_resuid;

        gid_t s_resgid;

        unsigned long s_commit_interval;

#ifdef CONFIG_QUOTA

        int s_jquota_fmt;

        char *s_qf_names[MAXQUOTAS];

#endif

};

/*

 * Structure of an inode on the disk

 */

struct ext3_inode {

        __le16  i_mode;         /* File mode */

        __le16  i_uid;          /* Low 16 bits of Owner Uid */

        __le32  i_size;         /* Size in bytes */

        __le32  i_atime;        /* Access time */

        __le32  i_ctime;        /* Creation time */

        __le32  i_mtime;        /* Modification time */

        __le32  i_dtime;        /* Deletion Time */

        __le16  i_gid;          /* Low 16 bits of Group Id */

        __le16  i_links_count;  /* Links count */

        __le32  i_blocks;       /* Blocks count */

        __le32  i_flags;        /* File flags */

        union {

                struct {

                        __u32  l_i_reserved1;

                } linux1;

                struct {

                        __u32  h_i_translator;

                } hurd1;

                struct {

                        __u32  m_i_reserved1;

                } masix1;

        } osd1;                         /* OS dependent 1 */

        __le32  i_block[EXT3_N_BLOCKS];/* Pointers to blocks */

        __le32  i_generation;   /* File version (for NFS) */

        __le32  i_file_acl;     /* File ACL */

        __le32  i_dir_acl;      /* Directory ACL */

        __le32  i_faddr;        /* Fragment address */

        union {

                struct {

                        __u8    l_i_frag;       /* Fragment number */

                        __u8    l_i_fsize;      /* Fragment size */

                        __u16   i_pad1;

                        __le16  l_i_uid_high;   /* these 2 fields    */

                        __le16  l_i_gid_high;   /* were reserved2[0] */

                        __u32   l_i_reserved2;

                } linux2;

                struct {

                        __u8    h_i_frag;       /* Fragment number */

                        __u8    h_i_fsize;      /* Fragment size */

                        __u16   h_i_mode_high;

                        __u16   h_i_uid_high;

                        __u16   h_i_gid_high;

                        __u32   h_i_author;

                } hurd2;

                struct {

                        __u8    m_i_frag;       /* Fragment number */

                        __u8    m_i_fsize;      /* Fragment size */

                        __u16   m_pad1;

                        __u32   m_i_reserved2[2];

                } masix2;

        } osd2;                         /* OS dependent 2 */

        __le16  i_extra_isize;

        __le16  i_pad1;

};

#define i_size_high     i_dir_acl

#if defined(__KERNEL__) || defined(__linux__)

#define i_reserved1     osd1.linux1.l_i_reserved1

#define i_frag          osd2.linux2.l_i_frag

#define i_fsize         osd2.linux2.l_i_fsize

#define i_uid_low       i_uid

#define i_gid_low       i_gid

#define i_uid_high      osd2.linux2.l_i_uid_high

#define i_gid_high      osd2.linux2.l_i_gid_high

#define i_reserved2     osd2.linux2.l_i_reserved2

#elif defined(__GNU__)

#define i_translator    osd1.hurd1.h_i_translator

#define i_frag          osd2.hurd2.h_i_frag;

#define i_fsize         osd2.hurd2.h_i_fsize;

#define i_uid_high      osd2.hurd2.h_i_uid_high

#define i_gid_high      osd2.hurd2.h_i_gid_high

#define i_author        osd2.hurd2.h_i_author

#elif defined(__masix__)

#define i_reserved1     osd1.masix1.m_i_reserved1

#define i_frag          osd2.masix2.m_i_frag

#define i_fsize         osd2.masix2.m_i_fsize

#define i_reserved2     osd2.masix2.m_i_reserved2

#endif /* defined(__KERNEL__) || defined(__linux__) */

/*

 * File system states

 */

#define EXT3_VALID_FS                   0x0001  /* Unmounted cleanly */

#define EXT3_ERROR_FS                   0x0002  /* Errors detected */

#define EXT3_ORPHAN_FS                  0x0004  /* Orphans being recovered */

/*

 * Mount flags

 */

#define EXT3_MOUNT_CHECK                0x00001 /* Do mount-time checks */

#define EXT3_MOUNT_OLDALLOC             0x00002  /* Don't use the new Orlov allocator */

#define EXT3_MOUNT_GRPID                0x00004 /* Create files with directory's group */

#define EXT3_MOUNT_DEBUG                0x00008 /* Some debugging messages */

#define EXT3_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */

#define EXT3_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */

#define EXT3_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */

#define EXT3_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */

#define EXT3_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/

#define EXT3_MOUNT_ABORT                0x00200 /* Fatal error detected */

#define EXT3_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */

#define EXT3_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */

#define EXT3_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */

#define EXT3_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */

#define EXT3_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */

#define EXT3_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */

#define EXT3_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */

#define EXT3_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */

#define EXT3_MOUNT_RESERVATION          0x10000 /* Preallocation */

#define EXT3_MOUNT_BARRIER              0x20000 /* Use block barriers */

#define EXT3_MOUNT_NOBH                 0x40000 /* No bufferheads */

#define EXT3_MOUNT_QUOTA                0x80000 /* Some quota option set */

#define EXT3_MOUNT_USRQUOTA             0x100000 /* "old" user quota */

#define EXT3_MOUNT_GRPQUOTA             0x200000 /* "old" group quota */

/* Compatibility, for having both ext2_fs.h and ext3_fs.h included at once */

#ifndef _LINUX_EXT2_FS_H

#define clear_opt(o, opt)               o &= ~EXT3_MOUNT_##opt

#define set_opt(o, opt)                 o |= EXT3_MOUNT_##opt

#define test_opt(sb, opt)               (EXT3_SB(sb)->s_mount_opt & \

                                         EXT3_MOUNT_##opt)

#else

#define EXT2_MOUNT_NOLOAD               EXT3_MOUNT_NOLOAD

#define EXT2_MOUNT_ABORT                EXT3_MOUNT_ABORT

#define EXT2_MOUNT_DATA_FLAGS           EXT3_MOUNT_DATA_FLAGS

#endif

#define ext3_set_bit                    ext2_set_bit

#define ext3_set_bit_atomic             ext2_set_bit_atomic

#define ext3_clear_bit                  ext2_clear_bit

#define ext3_clear_bit_atomic           ext2_clear_bit_atomic

#define ext3_test_bit                   ext2_test_bit

#define ext3_find_first_zero_bit        ext2_find_first_zero_bit

#define ext3_find_next_zero_bit         ext2_find_next_zero_bit

/*

 * Maximal mount counts between two filesystem checks

 */

#define EXT3_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */

#define EXT3_DFL_CHECKINTERVAL          0        /* Don't use interval check */

/*

 * Behaviour when detecting errors

 */

#define EXT3_ERRORS_CONTINUE            1       /* Continue execution */

#define EXT3_ERRORS_RO                  2       /* Remount fs read-only */

#define EXT3_ERRORS_PANIC               3       /* Panic */

#define EXT3_ERRORS_DEFAULT             EXT3_ERRORS_CONTINUE

/*

 * Structure of the super block

 */

struct ext3_super_block {

/*00*/  __le32  s_inodes_count;         /* Inodes count */

        __le32  s_blocks_count;         /* Blocks count */

        __le32  s_r_blocks_count;       /* Reserved blocks count */

        __le32  s_free_blocks_count;    /* Free blocks count */

/*10*/  __le32  s_free_inodes_count;    /* Free inodes count */

        __le32  s_first_data_block;     /* First Data Block */

        __le32  s_log_block_size;       /* Block size */

        __le32  s_log_frag_size;        /* Fragment size */

/*20*/  __le32  s_blocks_per_group;     /* # Blocks per group */

        __le32  s_frags_per_group;      /* # Fragments per group */

        __le32  s_inodes_per_group;     /* # Inodes per group */

        __le32  s_mtime;                /* Mount time */

/*30*/  __le32  s_wtime;                /* Write time */

        __le16  s_mnt_count;            /* Mount count */

        __le16  s_max_mnt_count;        /* Maximal mount count */

        __le16  s_magic;                /* Magic signature */

        __le16  s_state;                /* File system state */

        __le16  s_errors;               /* Behaviour when detecting errors */

        __le16  s_minor_rev_level;      /* minor revision level */

/*40*/  __le32  s_lastcheck;            /* time of last check */

        __le32  s_checkinterval;        /* max. time between checks */

        __le32  s_creator_os;           /* OS */

        __le32  s_rev_level;            /* Revision level */

/*50*/  __le16  s_def_resuid;           /* Default uid for reserved blocks */

        __le16  s_def_resgid;           /* Default gid for reserved blocks */

        /*

         * These fields are for EXT3_DYNAMIC_REV superblocks only.

         *

         * Note: the difference between the compatible feature set and

         * the incompatible feature set is that if there is a bit set

         * in the incompatible feature set that the kernel doesn't

         * know about, it should refuse to mount the filesystem.

         *

         * e2fsck's requirements are more strict; if it doesn't know

         * about a feature in either the compatible or incompatible

         * feature set, it must abort and not try to meddle with

         * things it doesn't understand...

         */

        __le32  s_first_ino;            /* First non-reserved inode */

        __le16   s_inode_size;          /* size of inode structure */

        __le16  s_block_group_nr;       /* block group # of this superblock */

        __le32  s_feature_compat;       /* compatible feature set */

/*60*/  __le32  s_feature_incompat;     /* incompatible feature set */

        __le32  s_feature_ro_compat;    /* readonly-compatible feature set */

/*68*/  __u8    s_uuid[16];             /* 128-bit uuid for volume */

/*78*/  char    s_volume_name[16];      /* volume name */

/*88*/  char    s_last_mounted[64];     /* directory where last mounted */

/*C8*/  __le32  s_algorithm_usage_bitmap; /* For compression */

        /*

         * Performance hints.  Directory preallocation should only

         * happen if the EXT3_FEATURE_COMPAT_DIR_PREALLOC flag is on.

         */

        __u8    s_prealloc_blocks;      /* Nr of blocks to try to preallocate*/

        __u8    s_prealloc_dir_blocks;  /* Nr to preallocate for dirs */

        __le16  s_reserved_gdt_blocks;  /* Per group desc for online growth */

        /*

         * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.

         */

/*D0*/  __u8    s_journal_uuid[16];     /* uuid of journal superblock */

/*E0*/  __le32  s_journal_inum;         /* inode number of journal file */

        __le32  s_journal_dev;          /* device number of journal file */

        __le32  s_last_orphan;          /* start of list of inodes to delete */

        __le32  s_hash_seed[4];         /* HTREE hash seed */

        __u8    s_def_hash_version;     /* Default hash version to use */

        __u8    s_reserved_char_pad;

        __u16   s_reserved_word_pad;

        __le32  s_default_mount_opts;

        __le32  s_first_meta_bg;        /* First metablock block group */

        __u32   s_reserved[190];        /* Padding to the end of the block */

};

#ifdef __KERNEL__

#include <linux/ext3_fs_i.h>

#include <linux/ext3_fs_sb.h>

static inline struct ext3_sb_info * EXT3_SB(struct super_block *sb)

{

        return sb->s_fs_info;

}

static inline struct ext3_inode_info *EXT3_I(struct inode *inode)

{

        return container_of(inode, struct ext3_inode_info, vfs_inode);

}

static inline int ext3_valid_inum(struct super_block *sb, unsigned long ino)

{

        return ino == EXT3_ROOT_INO ||

                ino == EXT3_JOURNAL_INO ||

                ino == EXT3_RESIZE_INO ||

                (ino >= EXT3_FIRST_INO(sb) &&

                 ino <= le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count));

}

#else

/* Assume that user mode programs are passing in an ext3fs superblock, not

 * a kernel struct super_block.  This will allow us to call the feature-test

 * macros from user land. */

#define EXT3_SB(sb)     (sb)

#endif

#define NEXT_ORPHAN(inode) EXT3_I(inode)->i_dtime

/*

 * Codes for operating systems

 */

#define EXT3_OS_LINUX           0

#define EXT3_OS_HURD            1

#define EXT3_OS_MASIX           2

#define EXT3_OS_FREEBSD         3

#define EXT3_OS_LITES           4

/*

 * Revision levels

 */

#define EXT3_GOOD_OLD_REV       0        /* The good old (original) format */

#define EXT3_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */

#define EXT3_CURRENT_REV        EXT3_GOOD_OLD_REV

#define EXT3_MAX_SUPP_REV       EXT3_DYNAMIC_REV

#define EXT3_GOOD_OLD_INODE_SIZE 128

/*

 * Feature set definitions

 */

#define EXT3_HAS_COMPAT_FEATURE(sb,mask)                        \

        ( EXT3_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )

#define EXT3_HAS_RO_COMPAT_FEATURE(sb,mask)                     \

        ( EXT3_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )

#define EXT3_HAS_INCOMPAT_FEATURE(sb,mask)                      \

        ( EXT3_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )

#define EXT3_SET_COMPAT_FEATURE(sb,mask)                        \

        EXT3_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)

#define EXT3_SET_RO_COMPAT_FEATURE(sb,mask)                     \

        EXT3_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)

#define EXT3_SET_INCOMPAT_FEATURE(sb,mask)                      \

        EXT3_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)

#define EXT3_CLEAR_COMPAT_FEATURE(sb,mask)                      \

        EXT3_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)

#define EXT3_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \

        EXT3_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)

#define EXT3_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \

        EXT3_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)

#define EXT3_FEATURE_COMPAT_DIR_PREALLOC        0x0001

#define EXT3_FEATURE_COMPAT_IMAGIC_INODES       0x0002

#define EXT3_FEATURE_COMPAT_HAS_JOURNAL         0x0004

#define EXT3_FEATURE_COMPAT_EXT_ATTR            0x0008

#define EXT3_FEATURE_COMPAT_RESIZE_INODE        0x0010

#define EXT3_FEATURE_COMPAT_DIR_INDEX           0x0020

#define EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001

#define EXT3_FEATURE_RO_COMPAT_LARGE_FILE       0x0002

#define EXT3_FEATURE_RO_COMPAT_BTREE_DIR        0x0004

#define EXT3_FEATURE_INCOMPAT_COMPRESSION       0x0001

#define EXT3_FEATURE_INCOMPAT_FILETYPE          0x0002

#define EXT3_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */

#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */

#define EXT3_FEATURE_INCOMPAT_META_BG           0x0010

#define EXT3_FEATURE_COMPAT_SUPP        EXT2_FEATURE_COMPAT_EXT_ATTR

#define EXT3_FEATURE_INCOMPAT_SUPP      (EXT3_FEATURE_INCOMPAT_FILETYPE| \

                                         EXT3_FEATURE_INCOMPAT_RECOVER| \

                                         EXT3_FEATURE_INCOMPAT_META_BG)

#define EXT3_FEATURE_RO_COMPAT_SUPP     (EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER| \

                                         EXT3_FEATURE_RO_COMPAT_LARGE_FILE| \

                                         EXT3_FEATURE_RO_COMPAT_BTREE_DIR)

/*

 * Default values for user and/or group using reserved blocks

 */

#define EXT3_DEF_RESUID         0

#define EXT3_DEF_RESGID         0

/*

 * Default mount options

 */

#define EXT3_DEFM_DEBUG         0x0001

#define EXT3_DEFM_BSDGROUPS     0x0002

#define EXT3_DEFM_XATTR_USER    0x0004

#define EXT3_DEFM_ACL           0x0008

#define EXT3_DEFM_UID16         0x0010

#define EXT3_DEFM_JMODE         0x0060

#define EXT3_DEFM_JMODE_DATA    0x0020

#define EXT3_DEFM_JMODE_ORDERED 0x0040

#define EXT3_DEFM_JMODE_WBACK   0x0060

/*

 * Structure of a directory entry

 */

#define EXT3_NAME_LEN 255

struct ext3_dir_entry {

        __le32  inode;                  /* Inode number */

        __le16  rec_len;                /* Directory entry length */

        __le16  name_len;               /* Name length */

        char    name[EXT3_NAME_LEN];    /* File name */

};

/*

 * The new version of the directory entry.  Since EXT3 structures are

 * stored in intel byte order, and the name_len field could never be

 * bigger than 255 chars, it's safe to reclaim the extra byte for the

 * file_type field.

 */

struct ext3_dir_entry_2 {

        __le32  inode;                  /* Inode number */

        __le16  rec_len;                /* Directory entry length */

        __u8    name_len;               /* Name length */

        __u8    file_type;

        char    name[EXT3_NAME_LEN];    /* File name */

};

/*

 * Ext3 directory file types.  Only the low 3 bits are used.  The

 * other bits are reserved for now.

 */

#define EXT3_FT_UNKNOWN         0

#define EXT3_FT_REG_FILE        1

#define EXT3_FT_DIR             2

#define EXT3_FT_CHRDEV          3

#define EXT3_FT_BLKDEV          4

#define EXT3_FT_FIFO            5

#define EXT3_FT_SOCK            6

#define EXT3_FT_SYMLINK         7

#define EXT3_FT_MAX             8

/*

 * EXT3_DIR_PAD defines the directory entries boundaries

 *

 * NOTE: It must be a multiple of 4

 */

#define EXT3_DIR_PAD                    4

#define EXT3_DIR_ROUND                  (EXT3_DIR_PAD - 1)

#define EXT3_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT3_DIR_ROUND) & \

                                         ~EXT3_DIR_ROUND)

#define EXT3_MAX_REC_LEN                ((1<<16)-1)

static inline unsigned ext3_rec_len_from_disk(__le16 dlen)

{

        unsigned len = le16_to_cpu(dlen);

        if (len == EXT3_MAX_REC_LEN)

                return 1 << 16;

        return len;

}

static inline __le16 ext3_rec_len_to_disk(unsigned len)

{

        if (len == (1 << 16))

                return cpu_to_le16(EXT3_MAX_REC_LEN);

        else if (len > (1 << 16))

                BUG();

        return cpu_to_le16(len);

}

/*

 * Hash Tree Directory indexing

 * (c) Daniel Phillips, 2001

 */

#define is_dx(dir) (EXT3_HAS_COMPAT_FEATURE(dir->i_sb, \

                                      EXT3_FEATURE_COMPAT_DIR_INDEX) && \

                      (EXT3_I(dir)->i_flags & EXT3_INDEX_FL))

#define EXT3_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT3_LINK_MAX)

#define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)

/* Legal values for the dx_root hash_version field: */

#define DX_HASH_LEGACY          0

#define DX_HASH_HALF_MD4        1

#define DX_HASH_TEA             2

#ifdef __KERNEL__

/* hash info structure used by the directory hash */

struct dx_hash_info

{

        u32             hash;

        u32             minor_hash;

        int             hash_version;

        u32             *seed;

};

#define EXT3_HTREE_EOF  0x7fffffff

/*

 * Control parameters used by ext3_htree_next_block

 */

#define HASH_NB_ALWAYS          1

/*

 * Describe an inode's exact location on disk and in memory

 */

struct ext3_iloc

{

        struct buffer_head *bh;

        unsigned long offset;

        unsigned long block_group;

};

static inline struct ext3_inode *ext3_raw_inode(struct ext3_iloc *iloc)

{

        return (struct ext3_inode *) (iloc->bh->b_data + iloc->offset);

}

/*

 * This structure is stuffed into the struct file's private_data field

 * for directories.  It is where we put information so that we can do

 * readdir operations in hash tree order.

 */

struct dir_private_info {

        struct rb_root  root;

        struct rb_node  *curr_node;

        struct fname    *extra_fname;

        loff_t          last_pos;

        __u32           curr_hash;

        __u32           curr_minor_hash;

        __u32           next_hash;

};

/* calculate the first block number of the group */

static inline ext3_fsblk_t

ext3_group_first_block_no(struct super_block *sb, unsigned long group_no)

{

        return group_no * (ext3_fsblk_t)EXT3_BLOCKS_PER_GROUP(sb) +

                le32_to_cpu(EXT3_SB(sb)->s_es->s_first_data_block);

}

/*

 * Special error return code only used by dx_probe() and its callers.

 */

#define ERR_BAD_DX_DIR  -75000

/*

 * Function prototypes

 */

/*

 * Ok, these declarations are also in <linux/kernel.h> but none of the

 * ext3 source programs needs to include it so they are duplicated here.

 */

# define NORET_TYPE    /**/

# define ATTRIB_NORET  __attribute__((noreturn))

# define NORET_AND     noreturn,

/* balloc.c */

extern int ext3_bg_has_super(struct super_block *sb, int group);

extern unsigned long ext3_bg_num_gdb(struct super_block *sb, int group);

extern ext3_fsblk_t ext3_new_block (handle_t *handle, struct inode *inode,

                        ext3_fsblk_t goal, int *errp);

extern ext3_fsblk_t ext3_new_blocks (handle_t *handle, struct inode *inode,

                        ext3_fsblk_t goal, unsigned long *count, int *errp);

extern void ext3_free_blocks (handle_t *handle, struct inode *inode,

                        ext3_fsblk_t block, unsigned long count);

extern void ext3_free_blocks_sb (handle_t *handle, struct super_block *sb,

                                 ext3_fsblk_t block, unsigned long count,

                                unsigned long *pdquot_freed_blocks);

extern ext3_fsblk_t ext3_count_free_blocks (struct super_block *);

extern void ext3_check_blocks_bitmap (struct super_block *);

extern struct ext3_group_desc * ext3_get_group_desc(struct super_block * sb,