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ext4_fs.h

/*
 *  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
 */

#define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
                              EXT4_FEATURE_COMPAT_DIR_INDEX) && \
                  (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
#define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
#define EXT4_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 EXT4_HTREE_EOF  0x7fffffff

/*
 * Control parameters used by ext4_htree_next_block
 */
#define HASH_NB_ALWAYS        1


/*
 * Describe an inode's exact location on disk and in memory
 */
struct ext4_iloc
{
      struct buffer_head *bh;
      unsigned long offset;
      unsigned long block_group;
};

static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
{
      return (struct ext4_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 ext4_fsblk_t
ext4_group_first_block_no(struct super_block *sb, unsigned long group_no)
{
      return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
            le32_to_cpu(EXT4_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

void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
                  unsigned long *blockgrpp, ext4_grpblk_t *offsetp);

/*
 * Function prototypes
 */

/*
 * Ok, these declarations are also in <linux/kernel.h> but none of the
 * ext4 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 unsigned int ext4_block_group(struct super_block *sb,
                  ext4_fsblk_t blocknr);
extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
                  ext4_fsblk_t blocknr);
extern int ext4_bg_has_super(struct super_block *sb, int group);
extern unsigned long ext4_bg_num_gdb(struct super_block *sb, int group);
extern ext4_fsblk_t ext4_new_block (handle_t *handle, struct inode *inode,
                  ext4_fsblk_t goal, int *errp);
extern ext4_fsblk_t ext4_new_blocks (handle_t *handle, struct inode *inode,
                  ext4_fsblk_t goal, unsigned long *count, int *errp);
extern void ext4_free_blocks (handle_t *handle, struct inode *inode,
                  ext4_fsblk_t block, unsigned long count);
extern void ext4_free_blocks_sb (handle_t *handle, struct super_block *sb,
                         ext4_fsblk_t block, unsigned long count,
                        unsigned long *pdquot_freed_blocks);
extern ext4_fsblk_t ext4_count_free_blocks (struct super_block *);
extern void ext4_check_blocks_bitmap (struct super_block *);
extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
                                        unsigned int block_group,
                                        struct buffer_head ** bh);
extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
extern void ext4_init_block_alloc_info(struct inode *);
extern void ext4_rsv_window_add(struct super_block *sb, struct ext4_reserve_window_node *rsv);

/* dir.c */
extern int ext4_check_dir_entry(const char *, struct inode *,
                        struct ext4_dir_entry_2 *,
                        struct buffer_head *, unsigned long);
extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
                            __u32 minor_hash,
                            struct ext4_dir_entry_2 *dirent);
extern void ext4_htree_free_dir_info(struct dir_private_info *p);

/* fsync.c */
extern int ext4_sync_file (struct file *, struct dentry *, int);

/* hash.c */
extern int ext4fs_dirhash(const char *name, int len, struct
                    dx_hash_info *hinfo);

/* ialloc.c */
extern struct inode * ext4_new_inode (handle_t *, struct inode *, int);
extern void ext4_free_inode (handle_t *, struct inode *);
extern struct inode * ext4_orphan_get (struct super_block *, unsigned long);
extern unsigned long ext4_count_free_inodes (struct super_block *);
extern unsigned long ext4_count_dirs (struct super_block *);
extern void ext4_check_inodes_bitmap (struct super_block *);
extern unsigned long ext4_count_free (struct buffer_head *, unsigned);


/* inode.c */
int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
            struct buffer_head *bh, ext4_fsblk_t blocknr);
struct buffer_head * ext4_getblk (handle_t *, struct inode *, long, int, int *);
struct buffer_head * ext4_bread (handle_t *, struct inode *, int, int, int *);
int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
      sector_t iblock, unsigned long maxblocks, struct buffer_head *bh_result,
      int create, int extend_disksize);

extern void ext4_read_inode (struct inode *);
extern int  ext4_write_inode (struct inode *, int);
extern int  ext4_setattr (struct dentry *, struct iattr *);
extern void ext4_delete_inode (struct inode *);
extern int  ext4_sync_inode (handle_t *, struct inode *);
extern void ext4_discard_reservation (struct inode *);
extern void ext4_dirty_inode(struct inode *);
extern int ext4_change_inode_journal_flag(struct inode *, int);
extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
extern void ext4_truncate (struct inode *);
extern void ext4_set_inode_flags(struct inode *);
extern void ext4_get_inode_flags(struct ext4_inode_info *);
extern void ext4_set_aops(struct inode *inode);
extern int ext4_writepage_trans_blocks(struct inode *);
extern int ext4_block_truncate_page(handle_t *handle, struct page *page,
            struct address_space *mapping, loff_t from);

/* ioctl.c */
extern int ext4_ioctl (struct inode *, struct file *, unsigned int,
                   unsigned long);
extern long ext4_compat_ioctl (struct file *, unsigned int, unsigned long);

/* namei.c */
extern int ext4_orphan_add(handle_t *, struct inode *);
extern int ext4_orphan_del(handle_t *, struct inode *);
extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
                        __u32 start_minor_hash, __u32 *next_hash);

/* resize.c */
extern int ext4_group_add(struct super_block *sb,
                        struct ext4_new_group_data *input);
extern int ext4_group_extend(struct super_block *sb,
                        struct ext4_super_block *es,
                        ext4_fsblk_t n_blocks_count);

/* super.c */
extern void ext4_error (struct super_block *, const char *, const char *, ...)
      __attribute__ ((format (printf, 3, 4)));
extern void __ext4_std_error (struct super_block *, const char *, int);
extern void ext4_abort (struct super_block *, const char *, const char *, ...)
      __attribute__ ((format (printf, 3, 4)));
extern void ext4_warning (struct super_block *, const char *, const char *, ...)
      __attribute__ ((format (printf, 3, 4)));
extern void ext4_update_dynamic_rev (struct super_block *sb);
extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
                              struct ext4_group_desc *bg);
extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
                              struct ext4_group_desc *bg);
extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
                             struct ext4_group_desc *bg);
extern void ext4_block_bitmap_set(struct super_block *sb,
                          struct ext4_group_desc *bg, ext4_fsblk_t blk);
extern void ext4_inode_bitmap_set(struct super_block *sb,
                          struct ext4_group_desc *bg, ext4_fsblk_t blk);
extern void ext4_inode_table_set(struct super_block *sb,
                         struct ext4_group_desc *bg, ext4_fsblk_t blk);

static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
{
      return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
            le32_to_cpu(es->s_blocks_count_lo);
}

static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
{
      return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
            le32_to_cpu(es->s_r_blocks_count_lo);
}

static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
{
      return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
            le32_to_cpu(es->s_free_blocks_count_lo);
}

static inline void ext4_blocks_count_set(struct ext4_super_block *es,
                               ext4_fsblk_t blk)
{
      es->s_blocks_count_lo = cpu_to_le32((u32)blk);
      es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
}

static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
                                    ext4_fsblk_t blk)
{
      es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
      es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
}

static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
                                 ext4_fsblk_t blk)
{
      es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
      es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
}



#define ext4_std_error(sb, errno)                     \
do {                                            \
      if ((errno))                                    \
            __ext4_std_error((sb), __FUNCTION__, (errno));  \
} while (0)

/*
 * Inodes and files operations
 */

/* dir.c */
extern const struct file_operations ext4_dir_operations;

/* file.c */
extern const struct inode_operations ext4_file_inode_operations;
extern const struct file_operations ext4_file_operations;

/* namei.c */
extern const struct inode_operations ext4_dir_inode_operations;
extern const struct inode_operations ext4_special_inode_operations;

/* symlink.c */
extern const struct inode_operations ext4_symlink_inode_operations;
extern const struct inode_operations ext4_fast_symlink_inode_operations;

/* extents.c */
extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
                  ext4_fsblk_t iblock,
                  unsigned long max_blocks, struct buffer_head *bh_result,
                  int create, int extend_disksize);
extern void ext4_ext_truncate(struct inode *, struct page *);
extern void ext4_ext_init(struct super_block *);
extern void ext4_ext_release(struct super_block *);
extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
                    loff_t len);
static inline int
ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, sector_t block,
                  unsigned long max_blocks, struct buffer_head *bh,
                  int create, int extend_disksize)
{
      if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL)
            return ext4_ext_get_blocks(handle, inode, block, max_blocks,
                              bh, create, extend_disksize);
      return ext4_get_blocks_handle(handle, inode, block, max_blocks, bh,
                              create, extend_disksize);
}


#endif      /* __KERNEL__ */

#endif      /* _LINUX_EXT4_FS_H */

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