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ctree.h

/*
 * Copyright (C) 2007 Oracle.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License v2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

#ifndef __BTRFS__
#define __BTRFS__

#include "list.h"
#include "kerncompat.h"
#include "radix-tree.h"
#include "extent-cache.h"
#include "extent_io.h"

struct btrfs_root;
struct btrfs_trans_handle;
#define BTRFS_MAGIC "_BHRfS_M"

#define BTRFS_MAX_LEVEL 8

#define BTRFS_COMPAT_EXTENT_TREE_V0

/* holds pointers to all of the tree roots */
#define BTRFS_ROOT_TREE_OBJECTID 1ULL

/* stores information about which extents are in use, and reference counts */
#define BTRFS_EXTENT_TREE_OBJECTID 2ULL

/*
 * chunk tree stores translations from logical -> physical block numbering
 * the super block points to the chunk tree
 */
#define BTRFS_CHUNK_TREE_OBJECTID 3ULL

/*
 * stores information about which areas of a given device are in use.
 * one per device.  The tree of tree roots points to the device tree
 */
#define BTRFS_DEV_TREE_OBJECTID 4ULL

/* one per subvolume, storing files and directories */
#define BTRFS_FS_TREE_OBJECTID 5ULL

/* directory objectid inside the root tree */
#define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
/* holds checksums of all the data extents */
#define BTRFS_CSUM_TREE_OBJECTID 7ULL


/* oprhan objectid for tracking unlinked/truncated files */
#define BTRFS_ORPHAN_OBJECTID -5ULL

/* does write ahead logging to speed up fsyncs */
#define BTRFS_TREE_LOG_OBJECTID -6ULL
#define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL

/* space balancing */
#define BTRFS_TREE_RELOC_OBJECTID -8ULL
#define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL

/*
 * extent checksums all have this objectid
 * this allows them to share the logging tree
 * for fsyncs
 */
#define BTRFS_EXTENT_CSUM_OBJECTID -10ULL

/* dummy objectid represents multiple objectids */
#define BTRFS_MULTIPLE_OBJECTIDS -255ULL

/*
 * All files have objectids in this range.
 */
#define BTRFS_FIRST_FREE_OBJECTID 256ULL
#define BTRFS_LAST_FREE_OBJECTID -256ULL
#define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL



/*
 * the device items go into the chunk tree.  The key is in the form
 * [ 1 BTRFS_DEV_ITEM_KEY device_id ]
 */
#define BTRFS_DEV_ITEMS_OBJECTID 1ULL

/*
 * we can actually store much bigger names, but lets not confuse the rest
 * of linux
 */
#define BTRFS_NAME_LEN 255

/* 32 bytes in various csum fields */
#define BTRFS_CSUM_SIZE 32

/* csum types */
#define BTRFS_CSUM_TYPE_CRC32 0


/* csum types */
#define BTRFS_CSUM_TYPE_CRC32 0

static int btrfs_csum_sizes[] = { 4, 0 };

/* four bytes for CRC32 */
#define BTRFS_CRC32_SIZE 4
#define BTRFS_EMPTY_DIR_SIZE 0

#define BTRFS_FT_UNKNOWN      0
#define BTRFS_FT_REG_FILE     1
#define BTRFS_FT_DIR          2
#define BTRFS_FT_CHRDEV       3
#define BTRFS_FT_BLKDEV       4
#define BTRFS_FT_FIFO         5
#define BTRFS_FT_SOCK         6
#define BTRFS_FT_SYMLINK      7
#define BTRFS_FT_XATTR        8
#define BTRFS_FT_MAX          9

/*
 * the key defines the order in the tree, and so it also defines (optimal)
 * block layout.  objectid corresonds to the inode number.  The flags
 * tells us things about the object, and is a kind of stream selector.
 * so for a given inode, keys with flags of 1 might refer to the inode
 * data, flags of 2 may point to file data in the btree and flags == 3
 * may point to extents.
 *
 * offset is the starting byte offset for this key in the stream.
 *
 * btrfs_disk_key is in disk byte order.  struct btrfs_key is always
 * in cpu native order.  Otherwise they are identical and their sizes
 * should be the same (ie both packed)
 */
00146 struct btrfs_disk_key {
      __le64 objectid;
      u8 type;
      __le64 offset;
} __attribute__ ((__packed__));

00152 struct btrfs_key {
      u64 objectid;
      u8 type;
      u64 offset;
} __attribute__ ((__packed__));

00158 struct btrfs_mapping_tree {
      struct cache_tree cache_tree;
};

#define BTRFS_UUID_SIZE 16
00163 struct btrfs_dev_item {
      /* the internal btrfs device id */
      __le64 devid;

      /* size of the device */
      __le64 total_bytes;

      /* bytes used */
      __le64 bytes_used;

      /* optimal io alignment for this device */
      __le32 io_align;

      /* optimal io width for this device */
      __le32 io_width;

      /* minimal io size for this device */
      __le32 sector_size;

      /* type and info about this device */
      __le64 type;

      /* expected generation for this device */
      __le64 generation;

      /*
       * starting byte of this partition on the device,
       * to allowr for stripe alignment in the future
       */
      __le64 start_offset;

      /* grouping information for allocation decisions */
      __le32 dev_group;

      /* seek speed 0-100 where 100 is fastest */
      u8 seek_speed;

      /* bandwidth 0-100 where 100 is fastest */
      u8 bandwidth;

      /* btrfs generated uuid for this device */
      u8 uuid[BTRFS_UUID_SIZE];

      /* uuid of FS who owns this device */
      u8 fsid[BTRFS_UUID_SIZE];
} __attribute__ ((__packed__));

00210 struct btrfs_stripe {
      __le64 devid;
      __le64 offset;
      u8 dev_uuid[BTRFS_UUID_SIZE];
} __attribute__ ((__packed__));

00216 struct btrfs_chunk {
      /* size of this chunk in bytes */
      __le64 length;

      /* objectid of the root referencing this chunk */
      __le64 owner;

      __le64 stripe_len;
      __le64 type;

      /* optimal io alignment for this chunk */
      __le32 io_align;

      /* optimal io width for this chunk */
      __le32 io_width;

      /* minimal io size for this chunk */
      __le32 sector_size;

      /* 2^16 stripes is quite a lot, a second limit is the size of a single
       * item in the btree
       */
      __le16 num_stripes;

      /* sub stripes only matter for raid10 */
      __le16 sub_stripes;
      struct btrfs_stripe stripe;
      /* additional stripes go here */
} __attribute__ ((__packed__));

static inline unsigned long btrfs_chunk_item_size(int num_stripes)
{
      BUG_ON(num_stripes == 0);
      return sizeof(struct btrfs_chunk) +
            sizeof(struct btrfs_stripe) * (num_stripes - 1);
}

#define BTRFS_FSID_SIZE 16
#define BTRFS_HEADER_FLAG_WRITTEN         (1ULL << 0)
#define BTRFS_HEADER_FLAG_RELOC                 (1ULL << 1)
#define BTRFS_SUPER_FLAG_SEEDING          (1ULL << 32)
#define BTRFS_SUPER_FLAG_METADUMP         (1ULL << 33)

#define BTRFS_BACKREF_REV_MAX       256
#define BTRFS_BACKREF_REV_SHIFT           56
#define BTRFS_BACKREF_REV_MASK            (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
                               BTRFS_BACKREF_REV_SHIFT)

#define BTRFS_OLD_BACKREF_REV       0
#define BTRFS_MIXED_BACKREF_REV           1

/*
 * every tree block (leaf or node) starts with this header.
 */
00270 struct btrfs_header {
      /* these first four must match the super block */
      u8 csum[BTRFS_CSUM_SIZE];
      u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
      __le64 bytenr; /* which block this node is supposed to live in */
      __le64 flags;

      /* allowed to be different from the super from here on down */
      u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
      __le64 generation;
      __le64 owner;
      __le32 nritems;
      u8 level;
} __attribute__ ((__packed__));

#define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
                          sizeof(struct btrfs_header)) / \
                          sizeof(struct btrfs_key_ptr))
#define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
#define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
#define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
                              sizeof(struct btrfs_item) - \
                              sizeof(struct btrfs_file_extent_item))


/*
 * this is a very generous portion of the super block, giving us
 * room to translate 14 chunks with 3 stripes each.
 */
#define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
#define BTRFS_LABEL_SIZE 256

/*
 * the super block basically lists the main trees of the FS
 * it currently lacks any block count etc etc
 */
00306 struct btrfs_super_block {
      u8 csum[BTRFS_CSUM_SIZE];
      /* the first 3 fields must match struct btrfs_header */
      u8 fsid[BTRFS_FSID_SIZE];    /* FS specific uuid */
      __le64 bytenr; /* this block number */
      __le64 flags;

      /* allowed to be different from the btrfs_header from here own down */
      __le64 magic;
      __le64 generation;
      __le64 root;
      __le64 chunk_root;
      __le64 log_root;

      /* this will help find the new super based on the log root */
      __le64 log_root_transid;
      __le64 total_bytes;
      __le64 bytes_used;
      __le64 root_dir_objectid;
      __le64 num_devices;
      __le32 sectorsize;
      __le32 nodesize;
      __le32 leafsize;
      __le32 stripesize;
      __le32 sys_chunk_array_size;
      __le64 chunk_root_generation;
      __le64 compat_flags;
      __le64 compat_ro_flags;
      __le64 incompat_flags;
      __le16 csum_type;
      u8 root_level;
      u8 chunk_root_level;
      u8 log_root_level;
      struct btrfs_dev_item dev_item;

      char label[BTRFS_LABEL_SIZE];

      /* future expansion */
      __le64 reserved[32];
      u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
} __attribute__ ((__packed__));

/*
 * Compat flags that we support.  If any incompat flags are set other than the
 * ones specified below then we will fail to mount
 */
#define BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF    (1ULL << 0)

#define BTRFS_FEATURE_COMPAT_SUPP         0ULL
#define BTRFS_FEATURE_COMPAT_RO_SUPP            0ULL
#define BTRFS_FEATURE_INCOMPAT_SUPP       \
      BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF

/*
 * A leaf is full of items. offset and size tell us where to find
 * the item in the leaf (relative to the start of the data area)
 */
00363 struct btrfs_item {
      struct btrfs_disk_key key;
      __le32 offset;
      __le32 size;
} __attribute__ ((__packed__));

/*
 * leaves have an item area and a data area:
 * [item0, item1....itemN] [free space] [dataN...data1, data0]
 *
 * The data is separate from the items to get the keys closer together
 * during searches.
 */
00376 struct btrfs_leaf {
      struct btrfs_header header;
      struct btrfs_item items[];
} __attribute__ ((__packed__));

/*
 * all non-leaf blocks are nodes, they hold only keys and pointers to
 * other blocks
 */
00385 struct btrfs_key_ptr {
      struct btrfs_disk_key key;
      __le64 blockptr;
      __le64 generation;
} __attribute__ ((__packed__));

00391 struct btrfs_node {
      struct btrfs_header header;
      struct btrfs_key_ptr ptrs[];
} __attribute__ ((__packed__));

/*
 * btrfs_paths remember the path taken from the root down to the leaf.
 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
 * to any other levels that are present.
 *
 * The slots array records the index of the item or block pointer
 * used while walking the tree.
 */

00405 struct btrfs_path {
      struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
      int slots[BTRFS_MAX_LEVEL];
      /* if there is real range locking, this locks field will change */
      int locks[BTRFS_MAX_LEVEL];
      int reada;
      /* keep some upper locks as we walk down */
      int lowest_level;

      /*
       * set by btrfs_split_item, tells search_slot to keep all locks
       * and to force calls to keep space in the nodes
       */
      unsigned int search_for_split:1;
      unsigned int keep_locks:1;
      unsigned int skip_locking:1;
      unsigned int leave_spinning:1;
};

/*
 * items in the extent btree are used to record the objectid of the
 * owner of the block and the number of references
 */

00429 struct btrfs_extent_item {
      __le64 refs;
      __le64 generation;
      __le64 flags;
} __attribute__ ((__packed__));

00435 struct btrfs_extent_item_v0 {
      __le32 refs;
} __attribute__ ((__packed__));

#define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r) >> 4) - \
                              sizeof(struct btrfs_item))

#define BTRFS_EXTENT_FLAG_DATA            (1ULL << 0)
#define BTRFS_EXTENT_FLAG_TREE_BLOCK      (1ULL << 1)

/* following flags only apply to tree blocks */

/* use full backrefs for extent pointers in the block*/
#define BTRFS_BLOCK_FLAG_FULL_BACKREF     (1ULL << 8)

00450 struct btrfs_tree_block_info {
      struct btrfs_disk_key key;
      u8 level;
} __attribute__ ((__packed__));

00455 struct btrfs_extent_data_ref {
      __le64 root;
      __le64 objectid;
      __le64 offset;
      __le32 count;
} __attribute__ ((__packed__));

00462 struct btrfs_shared_data_ref {
      __le32 count;
} __attribute__ ((__packed__));

00466 struct btrfs_extent_inline_ref {
      u8 type;
      u64 offset;
} __attribute__ ((__packed__));

00471 struct btrfs_extent_ref_v0 {
      __le64 root;
      __le64 generation;
      __le64 objectid;
      __le32 count;
} __attribute__ ((__packed__));

/* dev extents record free space on individual devices.  The owner
 * field points back to the chunk allocation mapping tree that allocated
 * the extent.  The chunk tree uuid field is a way to double check the owner
 */
00482 struct btrfs_dev_extent {
      __le64 chunk_tree;
      __le64 chunk_objectid;
      __le64 chunk_offset;
      __le64 length;
      u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
} __attribute__ ((__packed__));

00490 struct btrfs_inode_ref {
      __le64 index;
      __le16 name_len;
      /* name goes here */
} __attribute__ ((__packed__));

00496 struct btrfs_timespec {
      __le64 sec;
      __le32 nsec;
} __attribute__ ((__packed__));

typedef enum {
      BTRFS_COMPRESS_NONE = 0,
      BTRFS_COMPRESS_ZLIB = 1,
      BTRFS_COMPRESS_LAST = 2,
} btrfs_compression_type;

/* we don't understand any encryption methods right now */
typedef enum {
      BTRFS_ENCRYPTION_NONE = 0,
      BTRFS_ENCRYPTION_LAST = 1,
} btrfs_encryption_type;

00513 struct btrfs_inode_item {
      /* nfs style generation number */
      __le64 generation;
      /* transid that last touched this inode */
      __le64 transid;
      __le64 size;
      __le64 nbytes;
      __le64 block_group;
      __le32 nlink;
      __le32 uid;
      __le32 gid;
      __le32 mode;
      __le64 rdev;
      __le64 flags;

      /* modification sequence number for NFS */
      __le64 sequence;

      /*
       * a little future expansion, for more than this we can
       * just grow the inode item and version it
       */
      __le64 reserved[4];
      struct btrfs_timespec atime;
      struct btrfs_timespec ctime;
      struct btrfs_timespec mtime;
      struct btrfs_timespec otime;
} __attribute__ ((__packed__));

00542 struct btrfs_dir_log_item {
      __le64 end;
} __attribute__ ((__packed__));

00546 struct btrfs_dir_item {
      struct btrfs_disk_key location;
      __le64 transid;
      __le16 data_len;
      __le16 name_len;
      u8 type;
} __attribute__ ((__packed__));

00554 struct btrfs_root_item {
      struct btrfs_inode_item inode;
      __le64 generation;
      __le64 root_dirid;
      __le64 bytenr;
      __le64 byte_limit;
      __le64 bytes_used;
      __le64 last_snapshot;
      __le64 flags;
      __le32 refs;
      struct btrfs_disk_key drop_progress;
      u8 drop_level;
      u8 level;
} __attribute__ ((__packed__));

/*
 * this is used for both forward and backward root refs
 */
00572 struct btrfs_root_ref {
      __le64 dirid;
      __le64 sequence;
      __le16 name_len;
} __attribute__ ((__packed__));

#define BTRFS_FILE_EXTENT_INLINE 0
#define BTRFS_FILE_EXTENT_REG 1
#define BTRFS_FILE_EXTENT_PREALLOC 2

00582 struct btrfs_file_extent_item {
      /*
       * transaction id that created this extent
       */
      __le64 generation;
      /*
       * max number of bytes to hold this extent in ram
       * when we split a compressed extent we can't know how big
       * each of the resulting pieces will be.  So, this is
       * an upper limit on the size of the extent in ram instead of
       * an exact limit.
       */
      __le64 ram_bytes;

      /*
       * 32 bits for the various ways we might encode the data,
       * including compression and encryption.  If any of these
       * are set to something a given disk format doesn't understand
       * it is treated like an incompat flag for reading and writing,
       * but not for stat.
       */
      u8 compression;
      u8 encryption;
      __le16 other_encoding; /* spare for later use */

      /* are we inline data or a real extent? */
      u8 type;

      /*
       * disk space consumed by the extent, checksum blocks are included
       * in these numbers
       */
      __le64 disk_bytenr;
      __le64 disk_num_bytes;
      /*
       * the logical offset in file blocks (no csums)
       * this extent record is for.  This allows a file extent to point
       * into the middle of an existing extent on disk, sharing it
       * between two snapshots (useful if some bytes in the middle of the
       * extent have changed
       */
      __le64 offset;
      /*
       * the logical number of file blocks (no csums included)
       */
      __le64 num_bytes;

} __attribute__ ((__packed__));

00631 struct btrfs_csum_item {
      u8 csum;
} __attribute__ ((__packed__));

/* tag for the radix tree of block groups in ram */
#define BTRFS_BLOCK_GROUP_DATA     (1 << 0)
#define BTRFS_BLOCK_GROUP_SYSTEM   (1 << 1)
#define BTRFS_BLOCK_GROUP_METADATA (1 << 2)
#define BTRFS_BLOCK_GROUP_RAID0    (1 << 3)
#define BTRFS_BLOCK_GROUP_RAID1    (1 << 4)
#define BTRFS_BLOCK_GROUP_DUP    (1 << 5)
#define BTRFS_BLOCK_GROUP_RAID10   (1 << 6)

00644 struct btrfs_block_group_item {
      __le64 used;
      __le64 chunk_objectid;
      __le64 flags;
} __attribute__ ((__packed__));

00650 struct btrfs_space_info {
      u64 flags;
      u64 total_bytes;
      u64 bytes_used;
      u64 bytes_pinned;
      int full;
      struct list_head list;
};

00659 struct btrfs_block_group_cache {
      struct cache_extent cache;
      struct btrfs_key key;
      struct btrfs_block_group_item item;
      struct btrfs_space_info *space_info;
      u64 pinned;
      u64 flags;
      int cached;
      int ro;
};

00670 struct btrfs_extent_ops {
       int (*alloc_extent)(struct btrfs_root *root, u64 num_bytes,
                       u64 hint_byte, struct btrfs_key *ins);
       int (*free_extent)(struct btrfs_root *root, u64 bytenr,
                      u64 num_bytes);
};

struct btrfs_device;
struct btrfs_fs_devices;
00679 struct btrfs_fs_info {
      u8 fsid[BTRFS_FSID_SIZE];
      u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
      struct btrfs_root *fs_root;
      struct btrfs_root *extent_root;
      struct btrfs_root *tree_root;
      struct btrfs_root *chunk_root;
      struct btrfs_root *dev_root;
      struct btrfs_root *csum_root;

      struct cache_tree fs_root_cache;

      /* the log root tree is a directory of all the other log roots */
      struct btrfs_root *log_root_tree;

      struct extent_io_tree extent_cache;
      struct extent_io_tree free_space_cache;
      struct extent_io_tree block_group_cache;
      struct extent_io_tree pinned_extents;
      struct extent_io_tree pending_del;
      struct extent_io_tree extent_ins;

      /* logical->physical extent mapping */
      struct btrfs_mapping_tree mapping_tree;

      u64 generation;
      u64 last_trans_committed;

      u64 avail_data_alloc_bits;
      u64 avail_metadata_alloc_bits;
      u64 avail_system_alloc_bits;
      u64 data_alloc_profile;
      u64 metadata_alloc_profile;
      u64 system_alloc_profile;
      u64 alloc_start;

      struct btrfs_trans_handle *running_transaction;
      struct btrfs_super_block super_copy;
      struct mutex fs_mutex;

      u64 super_bytenr;
      u64 total_pinned;

      struct btrfs_extent_ops *extent_ops;
      struct list_head dirty_cowonly_roots;

      struct btrfs_fs_devices *fs_devices;
      struct list_head space_info;
      int system_allocs;
      int readonly;
};

/*
 * in ram representation of the tree.  extent_root is used for all allocations
 * and for the extent tree extent_root root.
 */
00735 struct btrfs_root {
      struct extent_buffer *node;
      struct extent_buffer *commit_root;
      struct btrfs_root_item root_item;
      struct btrfs_key root_key;
      struct btrfs_fs_info *fs_info;
      u64 objectid;
      u64 last_trans;

      /* data allocations are done in sectorsize units */
      u32 sectorsize;

      /* node allocations are done in nodesize units */
      u32 nodesize;

      /* leaf allocations are done in leafsize units */
      u32 leafsize;

      /* leaf allocations are done in leafsize units */
      u32 stripesize;

      int ref_cows;
      int track_dirty;


      u32 type;
      u64 highest_inode;
      u64 last_inode_alloc;

      /* the dirty list is only used by non-reference counted roots */
      struct list_head dirty_list;
      struct cache_extent cache;
};

/*
 * inode items have the data typically returned from stat and store other
 * info about object characteristics.  There is one for every file and dir in
 * the FS
 */
#define BTRFS_INODE_ITEM_KEY        1
#define BTRFS_INODE_REF_KEY         12
#define BTRFS_XATTR_ITEM_KEY        24
#define BTRFS_ORPHAN_ITEM_KEY       48

#define BTRFS_DIR_LOG_ITEM_KEY  60
#define BTRFS_DIR_LOG_INDEX_KEY 72
/*
 * dir items are the name -> inode pointers in a directory.  There is one
 * for every name in a directory.
 */
#define BTRFS_DIR_ITEM_KEY    84
#define BTRFS_DIR_INDEX_KEY   96

/*
 * extent data is for file data
 */
#define BTRFS_EXTENT_DATA_KEY 108

/*
 * csum items have the checksums for data in the extents
 */
#define BTRFS_CSUM_ITEM_KEY   120
/*
 * extent csums are stored in a separate tree and hold csums for
 * an entire extent on disk.
 */
#define BTRFS_EXTENT_CSUM_KEY 128

/*
 * root items point to tree roots.  There are typically in the root
 * tree used by the super block to find all the other trees
 */
#define BTRFS_ROOT_ITEM_KEY   132

/*
 * root backrefs tie subvols and snapshots to the directory entries that
 * reference them
 */
#define BTRFS_ROOT_BACKREF_KEY      144

/*
 * root refs make a fast index for listing all of the snapshots and
 * subvolumes referenced by a given root.  They point directly to the
 * directory item in the root that references the subvol
 */
#define BTRFS_ROOT_REF_KEY    156

/*
 * extent items are in the extent map tree.  These record which blocks
 * are used, and how many references there are to each block
 */
#define BTRFS_EXTENT_ITEM_KEY 168

#define BTRFS_TREE_BLOCK_REF_KEY    176

#define BTRFS_EXTENT_DATA_REF_KEY   178

/* old style extent backrefs */
#define BTRFS_EXTENT_REF_V0_KEY           180

#define BTRFS_SHARED_BLOCK_REF_KEY  182

#define BTRFS_SHARED_DATA_REF_KEY   184


/*
 * block groups give us hints into the extent allocation trees.  Which
 * blocks are free etc etc
 */
#define BTRFS_BLOCK_GROUP_ITEM_KEY 192

#define BTRFS_DEV_EXTENT_KEY  204
#define BTRFS_DEV_ITEM_KEY    216
#define BTRFS_CHUNK_ITEM_KEY  228

/*
 * string items are for debugging.  They just store a short string of
 * data in the FS
 */
#define BTRFS_STRING_ITEM_KEY 253
/*
 * Inode flags
 */
#define BTRFS_INODE_NODATASUM       (1 << 0)
#define BTRFS_INODE_NODATACOW       (1 << 1)
#define BTRFS_INODE_READONLY        (1 << 2)

#define read_eb_member(eb, ptr, type, member, result) (                 \
      read_extent_buffer(eb, (char *)(result),              \
                     ((unsigned long)(ptr)) +               \
                      offsetof(type, member),               \
                     sizeof(((type *)0)->member)))

#define write_eb_member(eb, ptr, type, member, result) (          \
      write_extent_buffer(eb, (char *)(result),             \
                     ((unsigned long)(ptr)) +               \
                      offsetof(type, member),               \
                     sizeof(((type *)0)->member)))

#define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits)       \
static inline u##bits btrfs_##name(struct extent_buffer *eb)            \
{                                                     \
      struct btrfs_header *h = (struct btrfs_header *)eb->data;   \
      return le##bits##_to_cpu(h->member);                        \
}                                                     \
static inline void btrfs_set_##name(struct extent_buffer *eb,           \
                            u##bits val)              \
{                                                     \
      struct btrfs_header *h = (struct btrfs_header *)eb->data;   \
      h->member = cpu_to_le##bits(val);                     \
}

#define BTRFS_SETGET_FUNCS(name, type, member, bits)              \
static inline u##bits btrfs_##name(struct extent_buffer *eb,            \
                           type *s)                   \
{                                                     \
      unsigned long offset = (unsigned long)s;              \
      type *p = (type *) (eb->data + offset);                     \
      return le##bits##_to_cpu(p->member);                        \
}                                                     \
static inline void btrfs_set_##name(struct extent_buffer *eb,           \
                            type *s, u##bits val)           \
{                                                     \
      unsigned long offset = (unsigned long)s;              \
      type *p = (type *) (eb->data + offset);                     \
      p->member = cpu_to_le##bits(val);                     \
}

#define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits)        \
static inline u##bits btrfs_##name(type *s)                       \
{                                                     \
      return le##bits##_to_cpu(s->member);                        \
}                                                     \
static inline void btrfs_set_##name(type *s, u##bits val)         \
{                                                     \
      s->member = cpu_to_le##bits(val);                     \
}

BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
               start_offset, 64);
BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);

BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
                   total_bytes, 64);
BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
                   bytes_used, 64);
BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
                   io_align, 32);
BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
                   io_width, 32);
BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
                   sector_size, 32);
BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
                   dev_group, 32);
BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
                   seek_speed, 8);
BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
                   bandwidth, 8);
BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
                   generation, 64);

static inline char *btrfs_device_uuid(struct btrfs_dev_item *d)
{
      return (char *)d + offsetof(struct btrfs_dev_item, uuid);
}

static inline char *btrfs_device_fsid(struct btrfs_dev_item *d)
{
      return (char *)d + offsetof(struct btrfs_dev_item, fsid);
}

BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);

static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
{
      return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
}

BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
                   stripe_len, 64);
BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
                   io_align, 32);
BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
                   io_width, 32);
BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
                   sector_size, 32);
BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
                   num_stripes, 16);
BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
                   sub_stripes, 16);
BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);

static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
                                       int nr)
{
      unsigned long offset = (unsigned long)c;
      offset += offsetof(struct btrfs_chunk, stripe);
      offset += nr * sizeof(struct btrfs_stripe);
      return (struct btrfs_stripe *)offset;
}

static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
{
      return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
}

static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
                               struct btrfs_chunk *c, int nr)
{
      return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
}

static inline void btrfs_set_stripe_offset_nr(struct extent_buffer *eb,
                                   struct btrfs_chunk *c, int nr,
                                   u64 val)
{
      btrfs_set_stripe_offset(eb, btrfs_stripe_nr(c, nr), val);
}

static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
                               struct btrfs_chunk *c, int nr)
{
      return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
}

static inline void btrfs_set_stripe_devid_nr(struct extent_buffer *eb,
                                   struct btrfs_chunk *c, int nr,
                                   u64 val)
{
      btrfs_set_stripe_devid(eb, btrfs_stripe_nr(c, nr), val);
}

/* struct btrfs_block_group_item */
BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
                   used, 64);
BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
                   used, 64);
BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
                  struct btrfs_block_group_item, chunk_objectid, 64);

BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
               struct btrfs_block_group_item, chunk_objectid, 64);
BTRFS_SETGET_FUNCS(disk_block_group_flags,
               struct btrfs_block_group_item, flags, 64);
BTRFS_SETGET_STACK_FUNCS(block_group_flags,
                  struct btrfs_block_group_item, flags, 64);

/* struct btrfs_inode_ref */
BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);

/* struct btrfs_inode_item */
BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);

BTRFS_SETGET_STACK_FUNCS(stack_inode_generation,
                   struct btrfs_inode_item, generation, 64);
BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence,
                   struct btrfs_inode_item, generation, 64);
BTRFS_SETGET_STACK_FUNCS(stack_inode_size,
                   struct btrfs_inode_item, size, 64);
BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes,
                   struct btrfs_inode_item, nbytes, 64);
BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group,
                   struct btrfs_inode_item, block_group, 64);
BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink,
                   struct btrfs_inode_item, nlink, 32);
BTRFS_SETGET_STACK_FUNCS(stack_inode_uid,
                   struct btrfs_inode_item, uid, 32);
BTRFS_SETGET_STACK_FUNCS(stack_inode_gid,
                   struct btrfs_inode_item, gid, 32);
BTRFS_SETGET_STACK_FUNCS(stack_inode_mode,
                   struct btrfs_inode_item, mode, 32);
BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev,
                   struct btrfs_inode_item, rdev, 64);
BTRFS_SETGET_STACK_FUNCS(stack_inode_flags,
                   struct btrfs_inode_item, flags, 64);

static inline struct btrfs_timespec *
btrfs_inode_atime(struct btrfs_inode_item *inode_item)
{
      unsigned long ptr = (unsigned long)inode_item;
      ptr += offsetof(struct btrfs_inode_item, atime);
      return (struct btrfs_timespec *)ptr;
}

static inline struct btrfs_timespec *
btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
{
      unsigned long ptr = (unsigned long)inode_item;
      ptr += offsetof(struct btrfs_inode_item, mtime);
      return (struct btrfs_timespec *)ptr;
}

static inline struct btrfs_timespec *
btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
{
      unsigned long ptr = (unsigned long)inode_item;
      ptr += offsetof(struct btrfs_inode_item, ctime);
      return (struct btrfs_timespec *)ptr;
}

static inline struct btrfs_timespec *
btrfs_inode_otime(struct btrfs_inode_item *inode_item)
{
      unsigned long ptr = (unsigned long)inode_item;
      ptr += offsetof(struct btrfs_inode_item, otime);
      return (struct btrfs_timespec *)ptr;
}

BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec,
                   sec, 64);
BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec,
                   nsec, 32);

/* struct btrfs_dev_extent */
BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
               chunk_tree, 64);
BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
               chunk_objectid, 64);
BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
               chunk_offset, 64);
BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);

static inline u8 *btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
{
      unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
      return (u8 *)((unsigned long)dev + ptr);
}


/* struct btrfs_extent_item */
BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
               generation, 64);
BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);

BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);

BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);

static inline void btrfs_tree_block_key(struct extent_buffer *eb,
                              struct btrfs_tree_block_info *item,
                              struct btrfs_disk_key *key)
{
      read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
}

static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
                                  struct btrfs_tree_block_info *item,
                                  struct btrfs_disk_key *key)
{
      write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
}

BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
               root, 64);
BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
               objectid, 64);
BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
               offset, 64);
BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
               count, 32);

BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
               count, 32);

BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
               type, 8);
BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
               offset, 64);

static inline u32 btrfs_extent_inline_ref_size(int type)
{
      if (type == BTRFS_TREE_BLOCK_REF_KEY ||
          type == BTRFS_SHARED_BLOCK_REF_KEY)
            return sizeof(struct btrfs_extent_inline_ref);
      if (type == BTRFS_SHARED_DATA_REF_KEY)
            return sizeof(struct btrfs_shared_data_ref) +
                   sizeof(struct btrfs_extent_inline_ref);
      if (type == BTRFS_EXTENT_DATA_REF_KEY)
            return sizeof(struct btrfs_extent_data_ref) +
                   offsetof(struct btrfs_extent_inline_ref, offset);
      BUG();
      return 0;
}

BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
               generation, 64);
BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);

/* struct btrfs_node */
BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);

static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
{
      unsigned long ptr;
      ptr = offsetof(struct btrfs_node, ptrs) +
            sizeof(struct btrfs_key_ptr) * nr;
      return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
}

static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
                                 int nr, u64 val)
{
      unsigned long ptr;
      ptr = offsetof(struct btrfs_node, ptrs) +
            sizeof(struct btrfs_key_ptr) * nr;
      btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
}

static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
{
      unsigned long ptr;
      ptr = offsetof(struct btrfs_node, ptrs) +
            sizeof(struct btrfs_key_ptr) * nr;
      return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
}

static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
                                     int nr, u64 val)
{
      unsigned long ptr;
      ptr = offsetof(struct btrfs_node, ptrs) +
            sizeof(struct btrfs_key_ptr) * nr;
      btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
}

static inline unsigned long btrfs_node_key_ptr_offset(int nr)
{
      return offsetof(struct btrfs_node, ptrs) +
            sizeof(struct btrfs_key_ptr) * nr;
}

static inline void btrfs_node_key(struct extent_buffer *eb,
                          struct btrfs_disk_key *disk_key, int nr)
{
      unsigned long ptr;
      ptr = btrfs_node_key_ptr_offset(nr);
      read_eb_member(eb, (struct btrfs_key_ptr *)ptr,
                   struct btrfs_key_ptr, key, disk_key);
}

static inline void btrfs_set_node_key(struct extent_buffer *eb,
                              struct btrfs_disk_key *disk_key, int nr)
{
      unsigned long ptr;
      ptr = btrfs_node_key_ptr_offset(nr);
      write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
                   struct btrfs_key_ptr, key, disk_key);
}

/* struct btrfs_item */
BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);

static inline unsigned long btrfs_item_nr_offset(int nr)
{
      return offsetof(struct btrfs_leaf, items) +
            sizeof(struct btrfs_item) * nr;
}

static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
                                     int nr)
{
      return (struct btrfs_item *)btrfs_item_nr_offset(nr);
}

static inline u32 btrfs_item_end(struct extent_buffer *eb,
                         struct btrfs_item *item)
{
      return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
}

static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
{
      return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
}

static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
{
      return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
}

static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
{
      return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
}

static inline void btrfs_item_key(struct extent_buffer *eb,
                     struct btrfs_disk_key *disk_key, int nr)
{
      struct btrfs_item *item = btrfs_item_nr(eb, nr);
      read_eb_member(eb, item, struct btrfs_item, key, disk_key);
}

static inline void btrfs_set_item_key(struct extent_buffer *eb,
                         struct btrfs_disk_key *disk_key, int nr)
{
      struct btrfs_item *item = btrfs_item_nr(eb, nr);
      write_eb_member(eb, item, struct btrfs_item, key, disk_key);
}

BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);

/*
 * struct btrfs_root_ref
 */
BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);

/* struct btrfs_dir_item */
BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);

static inline void btrfs_dir_item_key(struct extent_buffer *eb,
                              struct btrfs_dir_item *item,
                              struct btrfs_disk_key *key)
{
      read_eb_member(eb, item, struct btrfs_dir_item, location, key);
}

static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
                                struct btrfs_dir_item *item,
                                struct btrfs_disk_key *key)
{
      write_eb_member(eb, item, struct btrfs_dir_item, location, key);
}

/* struct btrfs_disk_key */
BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
                   objectid, 64);
BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);

static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
                               struct btrfs_disk_key *disk)
{
      cpu->offset = le64_to_cpu(disk->offset);
      cpu->type = disk->type;
      cpu->objectid = le64_to_cpu(disk->objectid);
}

static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
                               struct btrfs_key *cpu)
{
      disk->offset = cpu_to_le64(cpu->offset);
      disk->type = cpu->type;
      disk->objectid = cpu_to_le64(cpu->objectid);
}

static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
                          struct btrfs_key *key, int nr)
{
      struct btrfs_disk_key disk_key;
      btrfs_node_key(eb, &disk_key, nr);
      btrfs_disk_key_to_cpu(key, &disk_key);
}

static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
                          struct btrfs_key *key, int nr)
{
      struct btrfs_disk_key disk_key;
      btrfs_item_key(eb, &disk_key, nr);
      btrfs_disk_key_to_cpu(key, &disk_key);
}

static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
                              struct btrfs_dir_item *item,
                              struct btrfs_key *key)
{
      struct btrfs_disk_key disk_key;
      btrfs_dir_item_key(eb, item, &disk_key);
      btrfs_disk_key_to_cpu(key, &disk_key);
}


static inline u8 btrfs_key_type(struct btrfs_key *key)
{
      return key->type;
}

static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
{
      key->type = val;
}

/* struct btrfs_header */
BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
                    generation, 64);
BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);

static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
{
      return (btrfs_header_flags(eb) & flag) == flag;
}

static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
{
      u64 flags = btrfs_header_flags(eb);
      btrfs_set_header_flags(eb, flags | flag);
      return (flags & flag) == flag;
}

static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
{
      u64 flags = btrfs_header_flags(eb);
      btrfs_set_header_flags(eb, flags & ~flag);
      return (flags & flag) == flag;
}

static inline int btrfs_header_backref_rev(struct extent_buffer *eb)
{
      u64 flags = btrfs_header_flags(eb);
      return flags >> BTRFS_BACKREF_REV_SHIFT;
}

static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
                                    int rev)
{
      u64 flags = btrfs_header_flags(eb);
      flags &= ~BTRFS_BACKREF_REV_MASK;
      flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
      btrfs_set_header_flags(eb, flags);
}

static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
{
      unsigned long ptr = offsetof(struct btrfs_header, fsid);
      return (u8 *)ptr;
}

static inline u8 *btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
{
      unsigned long ptr = offsetof(struct btrfs_header, chunk_tree_uuid);
      return (u8 *)ptr;
}

static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
{
      unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
      return (u8 *)ptr;
}

static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
{
      unsigned long ptr = offsetof(struct btrfs_header, csum);
      return (u8 *)ptr;
}

static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
{
      return NULL;
}

static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
{
      return NULL;
}

static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
{
      return NULL;
}

static inline int btrfs_is_leaf(struct extent_buffer *eb)
{
      return (btrfs_header_level(eb) == 0);
}

/* struct btrfs_root_item */
BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
               generation, 64);
BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);

BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
                   generation, 64);
BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
                   last_snapshot, 64);


/* struct btrfs_super_block */

BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
                   generation, 64);
BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
                   struct btrfs_super_block, sys_chunk_array_size, 32);
BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
                   struct btrfs_super_block, chunk_root_generation, 64);
BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
                   root_level, 8);
BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
                   chunk_root, 64);
BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
                   chunk_root_level, 8);
BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
                   log_root, 64);
BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
                   log_root_transid, 64);
BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
                   log_root_level, 8);
BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
                   total_bytes, 64);
BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
                   bytes_used, 64);
BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
                   sectorsize, 32);
BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
                   nodesize, 32);
BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
                   leafsize, 32);
BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
                   stripesize, 32);
BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
                   root_dir_objectid, 64);
BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
                   num_devices, 64);
BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
                   compat_flags, 64);
BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
                   compat_flags, 64);
BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
                   incompat_flags, 64);
BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
                   csum_type, 16);

static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
{
      int t = btrfs_super_csum_type(s);
      BUG_ON(t >= ARRAY_SIZE(btrfs_csum_sizes));
      return btrfs_csum_sizes[t];
}

static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
{
      return offsetof(struct btrfs_leaf, items);
}

/* struct btrfs_file_extent_item */
BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);

static inline unsigned long btrfs_file_extent_inline_start(struct
                                       btrfs_file_extent_item *e)
{
      unsigned long offset = (unsigned long)e;
      offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
      return offset;
}

static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
{
      return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
}

BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
               disk_bytenr, 64);
BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
               generation, 64);
BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
               disk_num_bytes, 64);
BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
              offset, 64);
BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
               num_bytes, 64);
BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
               ram_bytes, 64);
BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
               compression, 8);
BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
               encryption, 8);
BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
               other_encoding, 16);

/* this returns the number of file bytes represented by the inline item.
 * If an item is compressed, this is the uncompressed size
 */
static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
                              struct btrfs_file_extent_item *e)
{
       return btrfs_file_extent_ram_bytes(eb, e);
}

/*
 * this returns the number of bytes used by the item on disk, minus the
 * size of any extent headers.  If a file is compressed on disk, this is
 * the compressed size
 */
static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
                                        struct btrfs_item *e)
{
       unsigned long offset;
       offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
       return btrfs_item_size(eb, e) - offset;
}

static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
      if (level == 0)
            return root->leafsize;
      return root->nodesize;
}

/* helper function to cast into the data area of the leaf. */
#define btrfs_item_ptr(leaf, slot, type) \
      ((type *)(btrfs_leaf_data(leaf) + \
      btrfs_item_offset_nr(leaf, slot)))

#define btrfs_item_ptr_offset(leaf, slot) \
      ((unsigned long)(btrfs_leaf_data(leaf) + \
      btrfs_item_offset_nr(leaf, slot)))

/* extent-tree.c */
int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
                   struct btrfs_root *root);
int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy);
struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
                                           btrfs_fs_info *info,
                                           u64 bytenr);
struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
                                     struct btrfs_block_group_cache
                                     *hint, u64 search_start,
                                     int data, int owner);
struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
                              struct btrfs_root *root,
                              u32 blocksize, u64 root_objectid,
                              struct btrfs_disk_key *key, int level,
                              u64 hint, u64 empty_size);
int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
                   struct btrfs_root *root,
                   u64 num_bytes, u64 parent,
                   u64 root_objectid, u64 ref_generation,
                   u64 owner, u64 empty_size, u64 hint_byte,
                   u64 search_end, struct btrfs_key *ins, int data);
int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
                       struct btrfs_root *root, u64 bytenr,
                       u64 num_bytes, u64 *refs, u64 *flags);
int btrfs_set_block_flags(struct btrfs_trans_handle *trans,
                    struct btrfs_root *root,
                    u64 bytenr, u64 num_bytes, u64 flags);
int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
              struct extent_buffer *buf, int record_parent);
int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
              struct extent_buffer *buf, int record_parent);
int btrfs_free_extent(struct btrfs_trans_handle *trans,
                  struct btrfs_root *root,
                  u64 bytenr, u64 num_bytes, u64 parent,
                  u64 root_objectid, u64 owner, u64 offset);
int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
                         struct btrfs_root *root,
                         struct extent_io_tree *unpin);
int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
                        struct btrfs_root *root,
                        u64 bytenr, u64 num_bytes, u64 parent,
                        u64 root_objectid, u64 ref_generation,
                        u64 owner_objectid);
int btrfs_update_extent_ref(struct btrfs_trans_handle *trans,
                      struct btrfs_root *root, u64 bytenr,
                      u64 orig_parent, u64 parent,
                      u64 root_objectid, u64 ref_generation,
                      u64 owner_objectid);
int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
                            struct btrfs_root *root);
int btrfs_free_block_groups(struct btrfs_fs_info *info);
int btrfs_read_block_groups(struct btrfs_root *root);
int btrfs_make_block_group(struct btrfs_trans_handle *trans,
                     struct btrfs_root *root, u64 bytes_used,
                     u64 type, u64 chunk_objectid, u64 chunk_offset,
                     u64 size);
int btrfs_make_block_groups(struct btrfs_trans_handle *trans,
                      struct btrfs_root *root);
int btrfs_update_block_group(struct btrfs_trans_handle *trans,
                       struct btrfs_root *root, u64 bytenr, u64 num,
                       int alloc, int mark_free);
/* ctree.c */
int btrfs_previous_item(struct btrfs_root *root,
                  struct btrfs_path *path, u64 min_objectid,
                  int type);
int btrfs_comp_keys(struct btrfs_disk_key *disk, struct btrfs_key *k2);
int btrfs_cow_block(struct btrfs_trans_handle *trans,
                struct btrfs_root *root, struct extent_buffer *buf,
                struct extent_buffer *parent, int parent_slot,
                struct extent_buffer **cow_ret);
int __btrfs_cow_block(struct btrfs_trans_handle *trans,
                       struct btrfs_root *root,
                       struct extent_buffer *buf,
                       struct extent_buffer *parent, int parent_slot,
                       struct extent_buffer **cow_ret,
                       u64 search_start, u64 empty_size);
int btrfs_copy_root(struct btrfs_trans_handle *trans,
                  struct btrfs_root *root,
                  struct extent_buffer *buf,
                  struct extent_buffer **cow_ret, u64 new_root_objectid);
int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
                  *root, struct btrfs_path *path, u32 data_size);
int btrfs_truncate_item(struct btrfs_trans_handle *trans,
                  struct btrfs_root *root,
                  struct btrfs_path *path,
                  u32 new_size, int from_end);
int btrfs_split_item(struct btrfs_trans_handle *trans,
                 struct btrfs_root *root,
                 struct btrfs_path *path,
                 struct btrfs_key *new_key,
                 unsigned long split_offset);
int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
                  *root, struct btrfs_key *key, struct btrfs_path *p, int
                  ins_len, int cow);
int btrfs_realloc_node(struct btrfs_trans_handle *trans,
                   struct btrfs_root *root, struct extent_buffer *parent,
                   int start_slot, int cache_only, u64 *last_ret,
                   struct btrfs_key *progress);
void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
struct btrfs_path *btrfs_alloc_path(void);
void btrfs_free_path(struct btrfs_path *p);
void btrfs_init_path(struct btrfs_path *p);
int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
               struct btrfs_path *path, int slot, int nr);

static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
                         struct btrfs_root *root,
                         struct btrfs_path *path)
{
      return btrfs_del_items(trans, root, path, path->slots[0], 1);
}

int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
                  *root, struct btrfs_key *key, void *data, u32 data_size);
int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
                       struct btrfs_root *root,
                       struct btrfs_path *path,
                       struct btrfs_key *cpu_key, u32 *data_size, int nr);

static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
                                struct btrfs_root *root,
                                struct btrfs_path *path,
                                struct btrfs_key *key,
                                u32 data_size)
{
      return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
}

int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
                  *root);
int btrfs_set_item_key_safe(struct btrfs_trans_handle *trans,
                      struct btrfs_root *root, struct btrfs_path *path,
                      struct btrfs_key *new_key);

/* root-item.c */
int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
                   struct btrfs_root *tree_root,
                   u64 root_id, u8 type, u64 ref_id,
                   u64 dirid, u64 sequence,
                   const char *name, int name_len);
int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
               struct btrfs_key *key);
int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
                  *root, struct btrfs_key *key, struct btrfs_root_item
                  *item);
int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
                  *root, struct btrfs_key *key, struct btrfs_root_item
                  *item);
int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
                   btrfs_root_item *item, struct btrfs_key *key);
int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
                    struct btrfs_root *latest_root);
/* dir-item.c */
int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
                    *root, const char *name, int name_len, u64 dir,
                    struct btrfs_key *location, u8 type, u64 index);
struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
                                   struct btrfs_root *root,
                                   struct btrfs_path *path, u64 dir,
                                   const char *name, int name_len,
                                   int mod);
struct btrfs_dir_item *
btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
                      struct btrfs_root *root,
                      struct btrfs_path *path, u64 dir,
                      u64 objectid, const char *name, int name_len,
                      int mod);
struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
                        struct btrfs_path *path,
                        const char *name, int name_len);
int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
                        struct btrfs_root *root,
                        struct btrfs_path *path,
                        struct btrfs_dir_item *di);
int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
                      struct btrfs_root *root, const char *name,
                      u16 name_len, const void *data, u16 data_len,
                      u64 dir);
struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
                                struct btrfs_root *root,
                                struct btrfs_path *path, u64 dir,
                                const char *name, u16 name_len,
                                int mod);
/* inode-map.c */
int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
                       struct btrfs_root *fs_root,
                       u64 dirid, u64 *objectid);
int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);

/* inode-item.c */
int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
                     struct btrfs_root *root,
                     const char *name, int name_len,
                     u64 inode_objectid, u64 ref_objectid, u64 index);
int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
                     struct btrfs_root *root,
                     const char *name, int name_len,
                     u64 inode_objectid, u64 ref_objectid);
int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
                       struct btrfs_root *root,
                       struct btrfs_path *path, u64 objectid);
int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
                   *root, u64 objectid, struct btrfs_inode_item
                   *inode_item);
int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
                   *root, struct btrfs_path *path,
                   struct btrfs_key *location, int mod);

/* file-item.c */
int btrfs_del_csums(struct btrfs_trans_handle *trans,
                struct btrfs_root *root, u64 bytenr, u64 len);
int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
                       struct btrfs_root *root,
                       u64 objectid, u64 pos, u64 offset,
                       u64 disk_num_bytes,
                       u64 num_bytes);
int btrfs_insert_inline_extent(struct btrfs_trans_handle *trans,
                        struct btrfs_root *root, u64 objectid,
                        u64 offset, char *buffer, size_t size);
int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
                       struct btrfs_root *root,
                       struct btrfs_path *path, u64 objectid,
                       u64 bytenr, int mod);
int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
                    struct btrfs_root *root, u64 alloc_end,
                    u64 bytenr, char *data, size_t len);
struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
                                struct btrfs_root *root,
                                struct btrfs_path *path,
                                u64 bytenr, int cow);
int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
                  struct btrfs_root *root, struct btrfs_path *path,
                  u64 isize);
#endif

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