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/*

 *  linux/include/linux/ext4_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_EXT4_FS_H

#define _LINUX_EXT4_FS_H

#include <linux/types.h>

#include <linux/blkdev.h>

#include <linux/magic.h>

/*

 * The second extended filesystem constants/structures

 */

/*

 * Define EXT4FS_DEBUG to produce debug messages

 */

#undef EXT4FS_DEBUG

/*

 * Define EXT4_RESERVATION to reserve data blocks for expanding files

 */

#define EXT4_DEFAULT_RESERVE_BLOCKS     8

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

#define EXT4_MAX_RESERVE_BLOCKS         1027

#define EXT4_RESERVE_WINDOW_NOT_ALLOCATED 0

/*

 * Debug code

 */

#ifdef EXT4FS_DEBUG

#define ext4_debug(f, a...)                                             \

        do {                                                            \

                printk (KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:",       \

                        __FILE__, __LINE__, __FUNCTION__);              \

                printk (KERN_DEBUG f, ## a);                            \

        } while (0)

#else

#define ext4_debug(f, a...)     do {} while (0)

#endif

/*

 * Special inodes numbers

 */

#define EXT4_BAD_INO             1      /* Bad blocks inode */

#define EXT4_ROOT_INO            2      /* Root inode */

#define EXT4_BOOT_LOADER_INO     5      /* Boot loader inode */

#define EXT4_UNDEL_DIR_INO       6      /* Undelete directory inode */

#define EXT4_RESIZE_INO          7      /* Reserved group descriptors inode */

#define EXT4_JOURNAL_INO         8      /* Journal inode */

/* First non-reserved inode for old ext4 filesystems */

#define EXT4_GOOD_OLD_FIRST_INO 11

/*

 * Maximal count of links to a file

 */

#define EXT4_LINK_MAX           65000

/*

 * Macro-instructions used to manage several block sizes

 */

#define EXT4_MIN_BLOCK_SIZE             1024

#define EXT4_MAX_BLOCK_SIZE             4096

#define EXT4_MIN_BLOCK_LOG_SIZE           10

#ifdef __KERNEL__

# define EXT4_BLOCK_SIZE(s)             ((s)->s_blocksize)

#else

# define EXT4_BLOCK_SIZE(s)             (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)

#endif

#define EXT4_ADDR_PER_BLOCK(s)          (EXT4_BLOCK_SIZE(s) / sizeof (__u32))

#ifdef __KERNEL__

# define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_blocksize_bits)

#else

# define EXT4_BLOCK_SIZE_BITS(s)        ((s)->s_log_block_size + 10)

#endif

#ifdef __KERNEL__

#define EXT4_ADDR_PER_BLOCK_BITS(s)     (EXT4_SB(s)->s_addr_per_block_bits)

#define EXT4_INODE_SIZE(s)              (EXT4_SB(s)->s_inode_size)

#define EXT4_FIRST_INO(s)               (EXT4_SB(s)->s_first_ino)

#else

#define EXT4_INODE_SIZE(s)      (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \

                                 EXT4_GOOD_OLD_INODE_SIZE : \

                                 (s)->s_inode_size)

#define EXT4_FIRST_INO(s)       (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \

                                 EXT4_GOOD_OLD_FIRST_INO : \

                                 (s)->s_first_ino)

#endif

#define EXT4_BLOCK_ALIGN(size, blkbits)         ALIGN((size), (1 << (blkbits)))

/*

 * Structure of a blocks group descriptor

 */

struct ext4_group_desc

{

        __le32  bg_block_bitmap_lo;     /* Blocks bitmap block */

        __le32  bg_inode_bitmap_lo;     /* Inodes bitmap block */

        __le32  bg_inode_table_lo;      /* 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 */

        __le16  bg_flags;               /* EXT4_BG_flags (INODE_UNINIT, etc) */

        __u32   bg_reserved[2];         /* Likely block/inode bitmap checksum */

        __le16  bg_itable_unused;       /* Unused inodes count */

        __le16  bg_checksum;            /* crc16(sb_uuid+group+desc) */

        __le32  bg_block_bitmap_hi;     /* Blocks bitmap block MSB */

        __le32  bg_inode_bitmap_hi;     /* Inodes bitmap block MSB */

        __le32  bg_inode_table_hi;      /* Inodes table block MSB */

};

#define EXT4_BG_INODE_UNINIT    0x0001 /* Inode table/bitmap not in use */

#define EXT4_BG_BLOCK_UNINIT    0x0002 /* Block bitmap not in use */

#define EXT4_BG_INODE_ZEROED    0x0004 /* On-disk itable initialized to zero */

#ifdef __KERNEL__

#include <linux/ext4_fs_i.h>

#include <linux/ext4_fs_sb.h>

#endif

/*

 * Macro-instructions used to manage group descriptors

 */

#define EXT4_MIN_DESC_SIZE              32

#define EXT4_MIN_DESC_SIZE_64BIT        64

#define EXT4_MAX_DESC_SIZE              EXT4_MIN_BLOCK_SIZE

#define EXT4_DESC_SIZE(s)               (EXT4_SB(s)->s_desc_size)

#ifdef __KERNEL__

# define EXT4_BLOCKS_PER_GROUP(s)       (EXT4_SB(s)->s_blocks_per_group)

# define EXT4_DESC_PER_BLOCK(s)         (EXT4_SB(s)->s_desc_per_block)

# define EXT4_INODES_PER_GROUP(s)       (EXT4_SB(s)->s_inodes_per_group)

# define EXT4_DESC_PER_BLOCK_BITS(s)    (EXT4_SB(s)->s_desc_per_block_bits)

#else

# define EXT4_BLOCKS_PER_GROUP(s)       ((s)->s_blocks_per_group)

# define EXT4_DESC_PER_BLOCK(s)         (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))

# define EXT4_INODES_PER_GROUP(s)       ((s)->s_inodes_per_group)

#endif

/*

 * Constants relative to the data blocks

 */

#define EXT4_NDIR_BLOCKS                12

#define EXT4_IND_BLOCK                  EXT4_NDIR_BLOCKS

#define EXT4_DIND_BLOCK                 (EXT4_IND_BLOCK + 1)

#define EXT4_TIND_BLOCK                 (EXT4_DIND_BLOCK + 1)

#define EXT4_N_BLOCKS                   (EXT4_TIND_BLOCK + 1)

/*

 * Inode flags

 */

#define EXT4_SECRM_FL                   0x00000001 /* Secure deletion */

#define EXT4_UNRM_FL                    0x00000002 /* Undelete */

#define EXT4_COMPR_FL                   0x00000004 /* Compress file */

#define EXT4_SYNC_FL                    0x00000008 /* Synchronous updates */

#define EXT4_IMMUTABLE_FL               0x00000010 /* Immutable file */

#define EXT4_APPEND_FL                  0x00000020 /* writes to file may only append */

#define EXT4_NODUMP_FL                  0x00000040 /* do not dump file */

#define EXT4_NOATIME_FL                 0x00000080 /* do not update atime */

/* Reserved for compression usage... */

#define EXT4_DIRTY_FL                   0x00000100

#define EXT4_COMPRBLK_FL                0x00000200 /* One or more compressed clusters */

#define EXT4_NOCOMPR_FL                 0x00000400 /* Don't compress */

#define EXT4_ECOMPR_FL                  0x00000800 /* Compression error */

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

#define EXT4_INDEX_FL                   0x00001000 /* hash-indexed directory */

#define EXT4_IMAGIC_FL                  0x00002000 /* AFS directory */

#define EXT4_JOURNAL_DATA_FL            0x00004000 /* file data should be journaled */

#define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */

#define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */

#define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/

#define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */

#define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */

#define EXT4_FL_USER_VISIBLE            0x000BDFFF /* User visible flags */

#define EXT4_FL_USER_MODIFIABLE         0x000380FF /* User modifiable flags */

/*

 * Inode dynamic state flags

 */

#define EXT4_STATE_JDATA                0x00000001 /* journaled data exists */

#define EXT4_STATE_NEW                  0x00000002 /* inode is newly created */

#define EXT4_STATE_XATTR                0x00000004 /* has in-inode xattrs */

#define EXT4_STATE_NO_EXPAND            0x00000008 /* No space for expansion */

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

struct ext4_new_group_input {

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

        __u64 block_bitmap;     /* Absolute block number of block bitmap */

        __u64 inode_bitmap;     /* Absolute block number of inode bitmap */

        __u64 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 ext4_new_group_input in kernel space, with free_blocks_count */

struct ext4_new_group_data {

        __u32 group;

        __u64 block_bitmap;

        __u64 inode_bitmap;

        __u64 inode_table;

        __u32 blocks_count;

        __u16 reserved_blocks;

        __u16 unused;

        __u32 free_blocks_count;

};

/*

 * Following is used by preallocation code to tell get_blocks() that we

 * want uninitialzed extents.

 */

#define EXT4_CREATE_UNINITIALIZED_EXT           2

/*

 * ioctl commands

 */

#define EXT4_IOC_GETFLAGS               FS_IOC_GETFLAGS

#define EXT4_IOC_SETFLAGS               FS_IOC_SETFLAGS

#define EXT4_IOC_GETVERSION             _IOR('f', 3, long)

#define EXT4_IOC_SETVERSION             _IOW('f', 4, long)

#define EXT4_IOC_GROUP_EXTEND           _IOW('f', 7, unsigned long)

#define EXT4_IOC_GROUP_ADD              _IOW('f', 8,struct ext4_new_group_input)

#define EXT4_IOC_GETVERSION_OLD         FS_IOC_GETVERSION

#define EXT4_IOC_SETVERSION_OLD         FS_IOC_SETVERSION

#ifdef CONFIG_JBD2_DEBUG

#define EXT4_IOC_WAIT_FOR_READONLY      _IOR('f', 99, long)

#endif

#define EXT4_IOC_GETRSVSZ               _IOR('f', 5, long)

#define EXT4_IOC_SETRSVSZ               _IOW('f', 6, long)

/*

 * ioctl commands in 32 bit emulation

 */

#define EXT4_IOC32_GETFLAGS             FS_IOC32_GETFLAGS

#define EXT4_IOC32_SETFLAGS             FS_IOC32_SETFLAGS

#define EXT4_IOC32_GETVERSION           _IOR('f', 3, int)

#define EXT4_IOC32_SETVERSION           _IOW('f', 4, int)

#define EXT4_IOC32_GETRSVSZ             _IOR('f', 5, int)

#define EXT4_IOC32_SETRSVSZ             _IOW('f', 6, int)

#define EXT4_IOC32_GROUP_EXTEND         _IOW('f', 7, unsigned int)

#ifdef CONFIG_JBD2_DEBUG

#define EXT4_IOC32_WAIT_FOR_READONLY    _IOR('f', 99, int)

#endif

#define EXT4_IOC32_GETVERSION_OLD       FS_IOC32_GETVERSION

#define EXT4_IOC32_SETVERSION_OLD       FS_IOC32_SETVERSION

/*

 *  Mount options

 */

struct ext4_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 ext4_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;        /* Inode Change 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[EXT4_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_obso_faddr;   /* Obsoleted fragment address */

        union {

                struct {

                        __le16  l_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */

                        __le16  l_i_file_acl_high;

                        __le16  l_i_uid_high;   /* these 2 fields */

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

                        __u32   l_i_reserved2;

                } linux2;

                struct {

                        __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */

                        __u16   h_i_mode_high;

                        __u16   h_i_uid_high;

                        __u16   h_i_gid_high;

                        __u32   h_i_author;

                } hurd2;

                struct {

                        __le16  h_i_reserved1;  /* Obsoleted fragment number/size which are removed in ext4 */

                        __le16  m_i_file_acl_high;

                        __u32   m_i_reserved2[2];

                } masix2;

        } osd2;                         /* OS dependent 2 */

        __le16  i_extra_isize;

        __le16  i_pad1;

        __le32  i_ctime_extra;  /* extra Change time      (nsec << 2 | epoch) */

        __le32  i_mtime_extra;  /* extra Modification time(nsec << 2 | epoch) */

        __le32  i_atime_extra;  /* extra Access time      (nsec << 2 | epoch) */

        __le32  i_crtime;       /* File Creation time */

        __le32  i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */

};

#define i_size_high     i_dir_acl

#define EXT4_EPOCH_BITS 2

#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)

#define EXT4_NSEC_MASK  (~0UL << EXT4_EPOCH_BITS)

/*

 * Extended fields will fit into an inode if the filesystem was formatted

 * with large inodes (-I 256 or larger) and there are not currently any EAs

 * consuming all of the available space. For new inodes we always reserve

 * enough space for the kernel's known extended fields, but for inodes

 * created with an old kernel this might not have been the case. None of

 * the extended inode fields is critical for correct filesystem operation.

 * This macro checks if a certain field fits in the inode. Note that

 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize

 */

#define EXT4_FITS_IN_INODE(ext4_inode, einode, field)   \

        ((offsetof(typeof(*ext4_inode), field) +        \

          sizeof((ext4_inode)->field))                  \

        <= (EXT4_GOOD_OLD_INODE_SIZE +                  \

            (einode)->i_extra_isize))                   \

static inline __le32 ext4_encode_extra_time(struct timespec *time)

{

       return cpu_to_le32((sizeof(time->tv_sec) > 4 ?

                           time->tv_sec >> 32 : 0) |

                           ((time->tv_nsec << 2) & EXT4_NSEC_MASK));

}

static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)

{

       if (sizeof(time->tv_sec) > 4)

               time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)

                               << 32;

       time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;

}

#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode)                          \

do {                                                                           \

        (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec);               \

        if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \

                (raw_inode)->xtime ## _extra =                                 \

                                ext4_encode_extra_time(&(inode)->xtime);       \

} while (0)

#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode)                        \

do {                                                                           \

        if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \

                (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec);      \

        if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \

                (raw_inode)->xtime ## _extra =                                 \

                                ext4_encode_extra_time(&(einode)->xtime);      \

} while (0)

#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode)                          \

do {                                                                           \

        (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime);       \

        if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra))     \

                ext4_decode_extra_time(&(inode)->xtime,                        \

                                       raw_inode->xtime ## _extra);            \

} while (0)

#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode)                        \

do {                                                                           \

        if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime))                      \

                (einode)->xtime.tv_sec =                                       \

                        (signed)le32_to_cpu((raw_inode)->xtime);               \

        if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra))            \

                ext4_decode_extra_time(&(einode)->xtime,                       \

                                       raw_inode->xtime ## _extra);            \

} while (0)

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

#define i_reserved1     osd1.linux1.l_i_reserved1

#define i_file_acl_high osd2.linux2.l_i_file_acl_high

#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_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_file_acl_high osd2.masix2.m_i_file_acl_high

#define i_reserved2     osd2.masix2.m_i_reserved2

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

/*

 * File system states

 */

#define EXT4_VALID_FS                   0x0001  /* Unmounted cleanly */

#define EXT4_ERROR_FS                   0x0002  /* Errors detected */

#define EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */

/*

 * Mount flags

 */

#define EXT4_MOUNT_CHECK                0x00001 /* Do mount-time checks */

#define EXT4_MOUNT_OLDALLOC             0x00002  /* Don't use the new Orlov allocator */

#define EXT4_MOUNT_GRPID                0x00004 /* Create files with directory's group */

#define EXT4_MOUNT_DEBUG                0x00008 /* Some debugging messages */

#define EXT4_MOUNT_ERRORS_CONT          0x00010 /* Continue on errors */

#define EXT4_MOUNT_ERRORS_RO            0x00020 /* Remount fs ro on errors */

#define EXT4_MOUNT_ERRORS_PANIC         0x00040 /* Panic on errors */

#define EXT4_MOUNT_MINIX_DF             0x00080 /* Mimics the Minix statfs */

#define EXT4_MOUNT_NOLOAD               0x00100 /* Don't use existing journal*/

#define EXT4_MOUNT_ABORT                0x00200 /* Fatal error detected */

#define EXT4_MOUNT_DATA_FLAGS           0x00C00 /* Mode for data writes: */

#define EXT4_MOUNT_JOURNAL_DATA         0x00400 /* Write data to journal */

#define EXT4_MOUNT_ORDERED_DATA         0x00800 /* Flush data before commit */

#define EXT4_MOUNT_WRITEBACK_DATA       0x00C00 /* No data ordering */

#define EXT4_MOUNT_UPDATE_JOURNAL       0x01000 /* Update the journal format */

#define EXT4_MOUNT_NO_UID32             0x02000  /* Disable 32-bit UIDs */

#define EXT4_MOUNT_XATTR_USER           0x04000 /* Extended user attributes */

#define EXT4_MOUNT_POSIX_ACL            0x08000 /* POSIX Access Control Lists */

#define EXT4_MOUNT_RESERVATION          0x10000 /* Preallocation */

#define EXT4_MOUNT_BARRIER              0x20000 /* Use block barriers */

#define EXT4_MOUNT_NOBH                 0x40000 /* No bufferheads */

#define EXT4_MOUNT_QUOTA                0x80000 /* Some quota option set */

#define EXT4_MOUNT_USRQUOTA             0x100000 /* "old" user quota */

#define EXT4_MOUNT_GRPQUOTA             0x200000 /* "old" group quota */

#define EXT4_MOUNT_EXTENTS              0x400000 /* Extents support */

/* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */

#ifndef _LINUX_EXT2_FS_H

#define clear_opt(o, opt)               o &= ~EXT4_MOUNT_##opt

#define set_opt(o, opt)                 o |= EXT4_MOUNT_##opt

#define test_opt(sb, opt)               (EXT4_SB(sb)->s_mount_opt & \

                                         EXT4_MOUNT_##opt)

#else

#define EXT2_MOUNT_NOLOAD               EXT4_MOUNT_NOLOAD

#define EXT2_MOUNT_ABORT                EXT4_MOUNT_ABORT

#define EXT2_MOUNT_DATA_FLAGS           EXT4_MOUNT_DATA_FLAGS

#endif

#define ext4_set_bit                    ext2_set_bit

#define ext4_set_bit_atomic             ext2_set_bit_atomic

#define ext4_clear_bit                  ext2_clear_bit

#define ext4_clear_bit_atomic           ext2_clear_bit_atomic

#define ext4_test_bit                   ext2_test_bit

#define ext4_find_first_zero_bit        ext2_find_first_zero_bit

#define ext4_find_next_zero_bit         ext2_find_next_zero_bit

/*

 * Maximal mount counts between two filesystem checks

 */

#define EXT4_DFL_MAX_MNT_COUNT          20      /* Allow 20 mounts */

#define EXT4_DFL_CHECKINTERVAL          0        /* Don't use interval check */

/*

 * Behaviour when detecting errors

 */

#define EXT4_ERRORS_CONTINUE            1       /* Continue execution */

#define EXT4_ERRORS_RO                  2       /* Remount fs read-only */

#define EXT4_ERRORS_PANIC               3       /* Panic */

#define EXT4_ERRORS_DEFAULT             EXT4_ERRORS_CONTINUE

/*

 * Structure of the super block

 */

struct ext4_super_block {

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

        __le32  s_blocks_count_lo;      /* Blocks count */

        __le32  s_r_blocks_count_lo;    /* Reserved blocks count */

        __le32  s_free_blocks_count_lo; /* 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_obso_log_frag_size;   /* Obsoleted fragment size */

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

        __le32  s_obso_frags_per_group; /* Obsoleted 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 EXT4_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 EXT4_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 EXT4_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;

        __le16  s_desc_size;            /* size of group descriptor */

/*100*/ __le32  s_default_mount_opts;

        __le32  s_first_meta_bg;        /* First metablock block group */

        __le32  s_mkfs_time;            /* When the filesystem was created */

        __le32  s_jnl_blocks[17];       /* Backup of the journal inode */

        /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */

/*150*/ __le32  s_blocks_count_hi;      /* Blocks count */

        __le32  s_r_blocks_count_hi;    /* Reserved blocks count */

        __le32  s_free_blocks_count_hi; /* Free blocks count */

        __le16  s_min_extra_isize;      /* All inodes have at least # bytes */

        __le16  s_want_extra_isize;     /* New inodes should reserve # bytes */

        __le32  s_flags;                /* Miscellaneous flags */

        __le16  s_raid_stride;          /* RAID stride */

        __le16  s_mmp_interval;         /* # seconds to wait in MMP checking */

        __le64  s_mmp_block;            /* Block for multi-mount protection */

        __le32  s_raid_stripe_width;    /* blocks on all data disks (N*stride)*/

        __u32   s_reserved[163];        /* Padding to the end of the block */

};

#ifdef __KERNEL__

static inline struct ext4_sb_info * EXT4_SB(struct super_block *sb)

{

        return sb->s_fs_info;

}

static inline struct ext4_inode_info *EXT4_I(struct inode *inode)

{

        return container_of(inode, struct ext4_inode_info, vfs_inode);

}

static inline struct timespec ext4_current_time(struct inode *inode)

{

        return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?

                current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;

}

static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)

{

        return ino == EXT4_ROOT_INO ||

                ino == EXT4_JOURNAL_INO ||

                ino == EXT4_RESIZE_INO ||

                (ino >= EXT4_FIRST_INO(sb) &&

                 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));

}

#else

/* Assume that user mode programs are passing in an ext4fs superblock, not

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

 * macros from user land. */

#define EXT4_SB(sb)     (sb)

#endif

#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime

/*

 * Codes for operating systems

 */

#define EXT4_OS_LINUX           0

#define EXT4_OS_HURD            1

#define EXT4_OS_MASIX           2

#define EXT4_OS_FREEBSD         3

#define EXT4_OS_LITES           4

/*

 * Revision levels

 */

#define EXT4_GOOD_OLD_REV       0        /* The good old (original) format */

#define EXT4_DYNAMIC_REV        1       /* V2 format w/ dynamic inode sizes */

#define EXT4_CURRENT_REV        EXT4_GOOD_OLD_REV

#define EXT4_MAX_SUPP_REV       EXT4_DYNAMIC_REV

#define EXT4_GOOD_OLD_INODE_SIZE 128

/*

 * Feature set definitions

 */

#define EXT4_HAS_COMPAT_FEATURE(sb,mask)                        \

        ( EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )

#define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask)                     \

        ( EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )

#define EXT4_HAS_INCOMPAT_FEATURE(sb,mask)                      \

        ( EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )

#define EXT4_SET_COMPAT_FEATURE(sb,mask)                        \

        EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)

#define EXT4_SET_RO_COMPAT_FEATURE(sb,mask)                     \

        EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)

#define EXT4_SET_INCOMPAT_FEATURE(sb,mask)                      \

        EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)

#define EXT4_CLEAR_COMPAT_FEATURE(sb,mask)                      \

        EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)

#define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask)                   \

        EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)

#define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask)                    \

        EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)

#define EXT4_FEATURE_COMPAT_DIR_PREALLOC        0x0001

#define EXT4_FEATURE_COMPAT_IMAGIC_INODES       0x0002

#define EXT4_FEATURE_COMPAT_HAS_JOURNAL         0x0004

#define EXT4_FEATURE_COMPAT_EXT_ATTR            0x0008

#define EXT4_FEATURE_COMPAT_RESIZE_INODE        0x0010

#define EXT4_FEATURE_COMPAT_DIR_INDEX           0x0020

#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER     0x0001

#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE       0x0002

#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR        0x0004

#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM         0x0010

#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK        0x0020

#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE      0x0040

#define EXT4_FEATURE_INCOMPAT_COMPRESSION       0x0001

#define EXT4_FEATURE_INCOMPAT_FILETYPE          0x0002

#define EXT4_FEATURE_INCOMPAT_RECOVER           0x0004 /* Needs recovery */

#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV       0x0008 /* Journal device */

#define EXT4_FEATURE_INCOMPAT_META_BG           0x0010

#define EXT4_FEATURE_INCOMPAT_EXTENTS           0x0040 /* extents support */

#define EXT4_FEATURE_INCOMPAT_64BIT             0x0080

#define EXT4_FEATURE_INCOMPAT_FLEX_BG           0x0200

#define EXT4_FEATURE_COMPAT_SUPP        EXT2_FEATURE_COMPAT_EXT_ATTR

#define EXT4_FEATURE_INCOMPAT_SUPP      (EXT4_FEATURE_INCOMPAT_FILETYPE| \

                                         EXT4_FEATURE_INCOMPAT_RECOVER| \

                                         EXT4_FEATURE_INCOMPAT_META_BG| \

                                         EXT4_FEATURE_INCOMPAT_EXTENTS| \

                                         EXT4_FEATURE_INCOMPAT_64BIT| \

                                         EXT4_FEATURE_INCOMPAT_FLEX_BG)

#define EXT4_FEATURE_RO_COMPAT_SUPP     (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \

                                         EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \

                                         EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \

                                         EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \

                                         EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \

                                         EXT4_FEATURE_RO_COMPAT_BTREE_DIR)

/*

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

 */

#define EXT4_DEF_RESUID         0

#define EXT4_DEF_RESGID         0

/*

 * Default mount options

 */

#define EXT4_DEFM_DEBUG         0x0001

#define EXT4_DEFM_BSDGROUPS     0x0002

#define EXT4_DEFM_XATTR_USER    0x0004

#define EXT4_DEFM_ACL           0x0008

#define EXT4_DEFM_UID16         0x0010

#define EXT4_DEFM_JMODE         0x0060

#define EXT4_DEFM_JMODE_DATA    0x0020

#define EXT4_DEFM_JMODE_ORDERED 0x0040

#define EXT4_DEFM_JMODE_WBACK   0x0060

/*

 * Structure of a directory entry

 */

#define EXT4_NAME_LEN 255

struct ext4_dir_entry {

        __le32  inode;                  /* Inode number */

        __le16  rec_len;                /* Directory entry length */

        __le16  name_len;               /* Name length */

        char    name[EXT4_NAME_LEN];    /* File name */

};

/*

 * The new version of the directory entry.  Since EXT4 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 ext4_dir_entry_2 {

        __le32  inode;                  /* Inode number */

        __le16  rec_len;                /* Directory entry length */

        __u8    name_len;               /* Name length */

        __u8    file_type;

        char    name[EXT4_NAME_LEN];    /* File name */

};

/*

 * Ext4 directory file types.  Only the low 3 bits are used.  The

 * other bits are reserved for now.

 */

#define EXT4_FT_UNKNOWN         0

#define EXT4_FT_REG_FILE        1

#define EXT4_FT_DIR             2

#define EXT4_FT_CHRDEV          3

#define EXT4_FT_BLKDEV          4

#define EXT4_FT_FIFO            5

#define EXT4_FT_SOCK            6

#define EXT4_FT_SYMLINK         7

#define EXT4_FT_MAX             8

/*

 * EXT4_DIR_PAD defines the directory entries boundaries

 *

 * NOTE: It must be a multiple of 4

 */

#define EXT4_DIR_PAD                    4

#define EXT4_DIR_ROUND                  (EXT4_DIR_PAD - 1)

#define EXT4_DIR_REC_LEN(name_len)      (((name_len) + 8 + EXT4_DIR_ROUND) & \

                                         ~EXT4_DIR_ROUND)

/*

 * Hash Tree Directory indexing

 * (c) Daniel Phillips, 2001

 */