ctree.h

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/*
 * 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_CTREE__
#define __BTRFS_CTREE__

#include <linux/mm.h>
#include <linux/highmem.h>
#include <linux/fs.h>
#include <linux/rwsem.h>
#include <linux/completion.h>
#include <linux/backing-dev.h>
#include <linux/wait.h>
#include <linux/slab.h>
#include <linux/kobject.h>
#include <trace/events/btrfs.h>
#include <asm/kmap_types.h>
#include <linux/pagemap.h>
#include "extent_io.h"
#include "extent_map.h"
#include "async-thread.h"
#include "ioctl.h"

struct btrfs_trans_handle;
struct btrfs_transaction;
struct btrfs_pending_snapshot;
extern struct kmem_cache *btrfs_trans_handle_cachep;
extern struct kmem_cache *btrfs_transaction_cachep;
extern struct kmem_cache *btrfs_bit_radix_cachep;
extern struct kmem_cache *btrfs_path_cachep;
extern struct kmem_cache *btrfs_free_space_cachep;
struct btrfs_ordered_sum;

#define BTRFS_MAGIC "_BHRfS_M"

#define BTRFS_MAX_MIRRORS 2

#define BTRFS_MAX_LEVEL 8

#define BTRFS_COMPAT_EXTENT_TREE_V0

/*
 * files bigger than this get some pre-flushing when they are added
 * to the ordered operations list.  That way we limit the total
 * work done by the commit
 */
#define BTRFS_ORDERED_OPERATIONS_FLUSH_LIMIT (8 * 1024 * 1024)

/* 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

/* for storing balance parameters in the root tree */
#define BTRFS_BALANCE_OBJECTID -4ULL

/* holds quota configuration and tracking */
#define BTRFS_QUOTA_TREE_OBJECTID 8ULL

/* orhpan 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

/* for 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

/* For storing free space cache */
#define BTRFS_FREE_SPACE_OBJECTID -11ULL

/*
 * The inode number assigned to the special inode for storing
 * free ino cache
 */
#define BTRFS_FREE_INO_OBJECTID -12ULL

/* 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

#define BTRFS_BTREE_INODE_OBJECTID 1

#define BTRFS_EMPTY_SUBVOL_DIR_OBJECTID 2

/*
 * the max metadata block size.  This limit is somewhat artificial,
 * but the memmove costs go through the roof for larger blocks.
 */
#define BTRFS_MAX_METADATA_BLOCKSIZE 65536

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

/*
 * Theoretical limit is larger, but we keep this down to a sane
 * value. That should limit greatly the possibility of collisions on
 * inode ref items.
 */
#define BTRFS_LINK_MAX 65535U

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

/* csum types */
#define BTRFS_CSUM_TYPE_CRC32   0

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

/* four bytes for CRC32 */
#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

/* ioprio of readahead is set to idle */
#define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0))

/*
 * The key defines the order in the tree, and so it also defines (optimal)
 * block layout.
 *
 * objectid corresponds to the inode number.
 *
 * type tells us things about the object, and is a kind of stream selector.
 * so for a given inode, keys with type of 1 might refer to the inode data,
 * type of 2 may point to file data in the btree and type == 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)
 */
struct btrfs_disk_key {
    __le64 objectid;
    u8 type;
    __le64 offset;
} __attribute__ ((__packed__));

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

struct btrfs_mapping_tree {
    struct extent_map_tree map_tree;
};

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 allow 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__));

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

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__));

#define BTRFS_FREE_SPACE_EXTENT 1
#define BTRFS_FREE_SPACE_BITMAP 2

struct btrfs_free_space_entry {
    __le64 offset;
    __le64 bytes;
    u8 type;
} __attribute__ ((__packed__));

struct btrfs_free_space_header {
    struct btrfs_disk_key location;
    __le64 generation;
    __le64 num_entries;
    __le64 num_bitmaps;
} __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_HEADER_FLAG_WRITTEN   (1ULL << 0)
#define BTRFS_HEADER_FLAG_RELOC     (1ULL << 1)

/*
 * File system states
 */

/* Errors detected */
#define BTRFS_SUPER_FLAG_ERROR      (1ULL << 2)

#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.
 */
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))
#define BTRFS_MAX_XATTR_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
                 sizeof(struct btrfs_item) -\
                 sizeof(struct btrfs_dir_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

/*
 * just in case we somehow lose the roots and are not able to mount,
 * we store an array of the roots from previous transactions
 * in the super.
 */
#define BTRFS_NUM_BACKUP_ROOTS 4
struct btrfs_root_backup {
    __le64 tree_root;
    __le64 tree_root_gen;

    __le64 chunk_root;
    __le64 chunk_root_gen;

    __le64 extent_root;
    __le64 extent_root_gen;

    __le64 fs_root;
    __le64 fs_root_gen;

    __le64 dev_root;
    __le64 dev_root_gen;

    __le64 csum_root;
    __le64 csum_root_gen;

    __le64 total_bytes;
    __le64 bytes_used;
    __le64 num_devices;
    /* future */
    __le64 unsed_64[4];

    u8 tree_root_level;
    u8 chunk_root_level;
    u8 extent_root_level;
    u8 fs_root_level;
    u8 dev_root_level;
    u8 csum_root_level;
    /* future and to align */
    u8 unused_8[10];
} __attribute__ ((__packed__));

/*
 * the super block basically lists the main trees of the FS
 * it currently lacks any block count etc etc
 */
struct btrfs_super_block {
    u8 csum[BTRFS_CSUM_SIZE];
    /* the first 4 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];

    __le64 cache_generation;

    /* future expansion */
    __le64 reserved[31];
    u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
    struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
} __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_INCOMPAT_DEFAULT_SUBVOL   (1ULL << 1)
#define BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS (1ULL << 2)
#define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO (1ULL << 3)
/*
 * some patches floated around with a second compression method
 * lets save that incompat here for when they do get in
 * Note we don't actually support it, we're just reserving the
 * number
 */
#define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZOv2   (1ULL << 4)

/*
 * older kernels tried to do bigger metadata blocks, but the
 * code was pretty buggy.  Lets not let them try anymore.
 */
#define BTRFS_FEATURE_INCOMPAT_BIG_METADATA (1ULL << 5)

#define BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF    (1ULL << 6)

#define BTRFS_FEATURE_COMPAT_SUPP       0ULL
#define BTRFS_FEATURE_COMPAT_RO_SUPP        0ULL
#define BTRFS_FEATURE_INCOMPAT_SUPP         \
    (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF |     \
     BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL |    \
     BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS |      \
     BTRFS_FEATURE_INCOMPAT_BIG_METADATA |      \
     BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO |      \
     BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)

/*
 * 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)
 */
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.
 */
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
 */
struct btrfs_key_ptr {
    struct btrfs_disk_key key;
    __le64 blockptr;
    __le64 generation;
} __attribute__ ((__packed__));

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.
 */
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;
    unsigned int search_commit_root:1;
};

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

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

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)

/*
 * this flag is only used internally by scrub and may be changed at any time
 * it is only declared here to avoid collisions
 */
#define BTRFS_EXTENT_FLAG_SUPER     (1ULL << 48)

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

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

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

struct btrfs_extent_inline_ref {
    u8 type;
    __le64 offset;
} __attribute__ ((__packed__));

/* old style backrefs item */
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
 */
struct btrfs_dev_extent {
    __le64 chunk_tree;
    __le64 chunk_objectid;
    __le64 chunk_offset;
    __le64 length;
    u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
} __attribute__ ((__packed__));

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

struct btrfs_inode_extref {
    __le64 parent_objectid;
    __le64 index;
    __le16 name_len;
    __u8   name[0];
    /* name goes here */
} __attribute__ ((__packed__));

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

enum btrfs_compression_type {
    BTRFS_COMPRESS_NONE  = 0,
    BTRFS_COMPRESS_ZLIB  = 1,
    BTRFS_COMPRESS_LZO   = 2,
    BTRFS_COMPRESS_TYPES = 2,
    BTRFS_COMPRESS_LAST  = 3,
};

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__));

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

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

#define BTRFS_ROOT_SUBVOL_RDONLY    (1ULL << 0)

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;

    /*
     * The following fields appear after subvol_uuids+subvol_times
     * were introduced.
     */

    /*
     * This generation number is used to test if the new fields are valid
     * and up to date while reading the root item. Everytime the root item
     * is written out, the "generation" field is copied into this field. If
     * anyone ever mounted the fs with an older kernel, we will have
     * mismatching generation values here and thus must invalidate the
     * new fields. See btrfs_update_root and btrfs_find_last_root for
     * details.
     * the offset of generation_v2 is also used as the start for the memset
     * when invalidating the fields.
     */
    __le64 generation_v2;
    u8 uuid[BTRFS_UUID_SIZE];
    u8 parent_uuid[BTRFS_UUID_SIZE];
    u8 received_uuid[BTRFS_UUID_SIZE];
    __le64 ctransid; /* updated when an inode changes */
    __le64 otransid; /* trans when created */
    __le64 stransid; /* trans when sent. non-zero for received subvol */
    __le64 rtransid; /* trans when received. non-zero for received subvol */
    struct btrfs_timespec ctime;
    struct btrfs_timespec otime;
    struct btrfs_timespec stime;
    struct btrfs_timespec rtime;
    __le64 reserved[8]; /* for future */
} __attribute__ ((__packed__));

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

struct btrfs_disk_balance_args {
    /*
     * profiles to operate on, single is denoted by
     * BTRFS_AVAIL_ALLOC_BIT_SINGLE
     */
    __le64 profiles;

    /* usage filter */
    __le64 usage;

    /* devid filter */
    __le64 devid;

    /* devid subset filter [pstart..pend) */
    __le64 pstart;
    __le64 pend;

    /* btrfs virtual address space subset filter [vstart..vend) */
    __le64 vstart;
    __le64 vend;

    /*
     * profile to convert to, single is denoted by
     * BTRFS_AVAIL_ALLOC_BIT_SINGLE
     */
    __le64 target;

    /* BTRFS_BALANCE_ARGS_* */
    __le64 flags;

    __le64 unused[8];
} __attribute__ ((__packed__));

/*
 * store balance parameters to disk so that balance can be properly
 * resumed after crash or unmount
 */
struct btrfs_balance_item {
    /* BTRFS_BALANCE_* */
    __le64 flags;

    struct btrfs_disk_balance_args data;
    struct btrfs_disk_balance_args meta;
    struct btrfs_disk_balance_args sys;

    __le64 unused[4];
} __attribute__ ((__packed__));

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

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).  This
     * always reflects the size uncompressed and without encoding.
     */
    __le64 num_bytes;

} __attribute__ ((__packed__));

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

struct btrfs_dev_stats_item {
    /*
     * grow this item struct at the end for future enhancements and keep
     * the existing values unchanged
     */
    __le64 values[BTRFS_DEV_STAT_VALUES_MAX];
} __attribute__ ((__packed__));

/* different types of block groups (and chunks) */
#define BTRFS_BLOCK_GROUP_DATA      (1ULL << 0)
#define BTRFS_BLOCK_GROUP_SYSTEM    (1ULL << 1)
#define BTRFS_BLOCK_GROUP_METADATA  (1ULL << 2)
#define BTRFS_BLOCK_GROUP_RAID0     (1ULL << 3)
#define BTRFS_BLOCK_GROUP_RAID1     (1ULL << 4)
#define BTRFS_BLOCK_GROUP_DUP       (1ULL << 5)
#define BTRFS_BLOCK_GROUP_RAID10    (1ULL << 6)
#define BTRFS_BLOCK_GROUP_RESERVED  BTRFS_AVAIL_ALLOC_BIT_SINGLE
#define BTRFS_NR_RAID_TYPES     5

#define BTRFS_BLOCK_GROUP_TYPE_MASK (BTRFS_BLOCK_GROUP_DATA |    \
                     BTRFS_BLOCK_GROUP_SYSTEM |  \
                     BTRFS_BLOCK_GROUP_METADATA)

#define BTRFS_BLOCK_GROUP_PROFILE_MASK  (BTRFS_BLOCK_GROUP_RAID0 |   \
                     BTRFS_BLOCK_GROUP_RAID1 |   \
                     BTRFS_BLOCK_GROUP_DUP |     \
                     BTRFS_BLOCK_GROUP_RAID10)
/*
 * We need a bit for restriper to be able to tell when chunks of type
 * SINGLE are available.  This "extended" profile format is used in
 * fs_info->avail_*_alloc_bits (in-memory) and balance item fields
 * (on-disk).  The corresponding on-disk bit in chunk.type is reserved
 * to avoid remappings between two formats in future.
 */
#define BTRFS_AVAIL_ALLOC_BIT_SINGLE    (1ULL << 48)

#define BTRFS_EXTENDED_PROFILE_MASK (BTRFS_BLOCK_GROUP_PROFILE_MASK | \
                     BTRFS_AVAIL_ALLOC_BIT_SINGLE)

static inline u64 chunk_to_extended(u64 flags)
{
    if ((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0)
        flags |= BTRFS_AVAIL_ALLOC_BIT_SINGLE;

    return flags;
}
static inline u64 extended_to_chunk(u64 flags)
{
    return flags & ~BTRFS_AVAIL_ALLOC_BIT_SINGLE;
}

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

/*
 * is subvolume quota turned on?
 */
#define BTRFS_QGROUP_STATUS_FLAG_ON     (1ULL << 0)
/*
 * SCANNING is set during the initialization phase
 */
#define BTRFS_QGROUP_STATUS_FLAG_SCANNING   (1ULL << 1)
/*
 * Some qgroup entries are known to be out of date,
 * either because the configuration has changed in a way that
 * makes a rescan necessary, or because the fs has been mounted
 * with a non-qgroup-aware version.
 * Turning qouta off and on again makes it inconsistent, too.
 */
#define BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT   (1ULL << 2)

#define BTRFS_QGROUP_STATUS_VERSION        1

struct btrfs_qgroup_status_item {
    __le64 version;
    /*
     * the generation is updated during every commit. As older
     * versions of btrfs are not aware of qgroups, it will be
     * possible to detect inconsistencies by checking the
     * generation on mount time
     */
    __le64 generation;

    /* flag definitions see above */
    __le64 flags;

    /*
     * only used during scanning to record the progress
     * of the scan. It contains a logical address
     */
    __le64 scan;
} __attribute__ ((__packed__));

struct btrfs_qgroup_info_item {
    __le64 generation;
    __le64 rfer;
    __le64 rfer_cmpr;
    __le64 excl;
    __le64 excl_cmpr;
} __attribute__ ((__packed__));

/* flags definition for qgroup limits */
#define BTRFS_QGROUP_LIMIT_MAX_RFER (1ULL << 0)
#define BTRFS_QGROUP_LIMIT_MAX_EXCL (1ULL << 1)
#define BTRFS_QGROUP_LIMIT_RSV_RFER (1ULL << 2)
#define BTRFS_QGROUP_LIMIT_RSV_EXCL (1ULL << 3)
#define BTRFS_QGROUP_LIMIT_RFER_CMPR    (1ULL << 4)
#define BTRFS_QGROUP_LIMIT_EXCL_CMPR    (1ULL << 5)

struct btrfs_qgroup_limit_item {
    /*
     * only updated when any of the other values change
     */
    __le64 flags;
    __le64 max_rfer;
    __le64 max_excl;
    __le64 rsv_rfer;
    __le64 rsv_excl;
} __attribute__ ((__packed__));

struct btrfs_space_info {
    u64 flags;

    u64 total_bytes;    /* total bytes in the space,
                   this doesn't take mirrors into account */
    u64 bytes_used;     /* total bytes used,
                   this doesn't take mirrors into account */
    u64 bytes_pinned;   /* total bytes pinned, will be freed when the
                   transaction finishes */
    u64 bytes_reserved; /* total bytes the allocator has reserved for
                   current allocations */
    u64 bytes_readonly; /* total bytes that are read only */

    u64 bytes_may_use;  /* number of bytes that may be used for
                   delalloc/allocations */
    u64 disk_used;      /* total bytes used on disk */
    u64 disk_total;     /* total bytes on disk, takes mirrors into
                   account */

    /*
     * we bump reservation progress every time we decrement
     * bytes_reserved.  This way people waiting for reservations
     * know something good has happened and they can check
     * for progress.  The number here isn't to be trusted, it
     * just shows reclaim activity
     */
    unsigned long reservation_progress;

    unsigned int full:1;    /* indicates that we cannot allocate any more
                   chunks for this space */
    unsigned int chunk_alloc:1; /* set if we are allocating a chunk */

    unsigned int flush:1;       /* set if we are trying to make space */

    unsigned int force_alloc;   /* set if we need to force a chunk
                       alloc for this space */

    struct list_head list;

    /* for block groups in our same type */
    struct list_head block_groups[BTRFS_NR_RAID_TYPES];
    spinlock_t lock;
    struct rw_semaphore groups_sem;
    wait_queue_head_t wait;
};

#define BTRFS_BLOCK_RSV_GLOBAL      1
#define BTRFS_BLOCK_RSV_DELALLOC    2
#define BTRFS_BLOCK_RSV_TRANS       3
#define BTRFS_BLOCK_RSV_CHUNK       4
#define BTRFS_BLOCK_RSV_DELOPS      5
#define BTRFS_BLOCK_RSV_EMPTY       6
#define BTRFS_BLOCK_RSV_TEMP        7

struct btrfs_block_rsv {
    u64 size;
    u64 reserved;
    struct btrfs_space_info *space_info;
    spinlock_t lock;
    unsigned short full;
    unsigned short type;
    unsigned short failfast;
};

/*
 * free clusters are used to claim free space in relatively large chunks,
 * allowing us to do less seeky writes.  They are used for all metadata
 * allocations and data allocations in ssd mode.
 */
struct btrfs_free_cluster {
    spinlock_t lock;
    spinlock_t refill_lock;
    struct rb_root root;

    /* largest extent in this cluster */
    u64 max_size;

    /* first extent starting offset */
    u64 window_start;

    struct btrfs_block_group_cache *block_group;
    /*
     * when a cluster is allocated from a block group, we put the
     * cluster onto a list in the block group so that it can
     * be freed before the block group is freed.
     */
    struct list_head block_group_list;
};

enum btrfs_caching_type {
    BTRFS_CACHE_NO      = 0,
    BTRFS_CACHE_STARTED = 1,
    BTRFS_CACHE_FAST    = 2,
    BTRFS_CACHE_FINISHED    = 3,
};

enum btrfs_disk_cache_state {
    BTRFS_DC_WRITTEN    = 0,
    BTRFS_DC_ERROR      = 1,
    BTRFS_DC_CLEAR      = 2,
    BTRFS_DC_SETUP      = 3,
    BTRFS_DC_NEED_WRITE = 4,
};

struct btrfs_caching_control {
    struct list_head list;
    struct mutex mutex;
    wait_queue_head_t wait;
    struct btrfs_work work;
    struct btrfs_block_group_cache *block_group;
    u64 progress;
    atomic_t count;
};

struct btrfs_block_group_cache {
    struct btrfs_key key;
    struct btrfs_block_group_item item;
    struct btrfs_fs_info *fs_info;
    struct inode *inode;
    spinlock_t lock;
    u64 pinned;
    u64 reserved;
    u64 bytes_super;
    u64 flags;
    u64 sectorsize;
    u64 cache_generation;
    unsigned int ro:1;
    unsigned int dirty:1;
    unsigned int iref:1;

    int disk_cache_state;

    /* cache tracking stuff */
    int cached;
    struct btrfs_caching_control *caching_ctl;
    u64 last_byte_to_unpin;

    struct btrfs_space_info *space_info;

    /* free space cache stuff */
    struct btrfs_free_space_ctl *free_space_ctl;

    /* block group cache stuff */
    struct rb_node cache_node;

    /* for block groups in the same raid type */
    struct list_head list;

    /* usage count */
    atomic_t count;

    /* List of struct btrfs_free_clusters for this block group.
     * Today it will only have one thing on it, but that may change
     */
    struct list_head cluster_list;

    /* For delayed block group creation */
    struct list_head new_bg_list;
};

/* delayed seq elem */
struct seq_list {
    struct list_head list;
    u64 seq;
};

/* fs_info */
struct reloc_control;
struct btrfs_device;
struct btrfs_fs_devices;
struct btrfs_balance_control;
struct btrfs_delayed_root;
struct btrfs_fs_info {
    u8 fsid[BTRFS_FSID_SIZE];
    u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
    struct btrfs_root *extent_root;
    struct btrfs_root *tree_root;
    struct btrfs_root *chunk_root;
    struct btrfs_root *dev_root;
    struct btrfs_root *fs_root;
    struct btrfs_root *csum_root;
    struct btrfs_root *quota_root;

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

    spinlock_t fs_roots_radix_lock;
    struct radix_tree_root fs_roots_radix;

    /* block group cache stuff */
    spinlock_t block_group_cache_lock;
    struct rb_root block_group_cache_tree;

    /* keep track of unallocated space */
    spinlock_t free_chunk_lock;
    u64 free_chunk_space;

    struct extent_io_tree freed_extents[2];
    struct extent_io_tree *pinned_extents;

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

    /*
     * block reservation for extent, checksum, root tree and
     * delayed dir index item
     */
    struct btrfs_block_rsv global_block_rsv;
    /* block reservation for delay allocation */
    struct btrfs_block_rsv delalloc_block_rsv;
    /* block reservation for metadata operations */
    struct btrfs_block_rsv trans_block_rsv;
    /* block reservation for chunk tree */
    struct btrfs_block_rsv chunk_block_rsv;
    /* block reservation for delayed operations */
    struct btrfs_block_rsv delayed_block_rsv;

    struct btrfs_block_rsv empty_block_rsv;

    u64 generation;
    u64 last_trans_committed;

    /*
     * this is updated to the current trans every time a full commit
     * is required instead of the faster short fsync log commits
     */
    u64 last_trans_log_full_commit;
    unsigned long mount_opt;
    unsigned long compress_type:4;
    u64 max_inline;
    u64 alloc_start;
    struct btrfs_transaction *running_transaction;
    wait_queue_head_t transaction_throttle;
    wait_queue_head_t transaction_wait;
    wait_queue_head_t transaction_blocked_wait;
    wait_queue_head_t async_submit_wait;

    struct btrfs_super_block *super_copy;
    struct btrfs_super_block *super_for_commit;
    struct block_device *__bdev;
    struct super_block *sb;
    struct inode *btree_inode;
    struct backing_dev_info bdi;
    struct mutex tree_log_mutex;
    struct mutex transaction_kthread_mutex;
    struct mutex cleaner_mutex;
    struct mutex chunk_mutex;
    struct mutex volume_mutex;
    /*
     * this protects the ordered operations list only while we are
     * processing all of the entries on it.  This way we make
     * sure the commit code doesn't find the list temporarily empty
     * because another function happens to be doing non-waiting preflush
     * before jumping into the main commit.
     */
    struct mutex ordered_operations_mutex;
    struct rw_semaphore extent_commit_sem;

    struct rw_semaphore cleanup_work_sem;

    struct rw_semaphore subvol_sem;
    struct srcu_struct subvol_srcu;

    spinlock_t trans_lock;
    /*
     * the reloc mutex goes with the trans lock, it is taken
     * during commit to protect us from the relocation code
     */
    struct mutex reloc_mutex;

    struct list_head trans_list;
    struct list_head dead_roots;
    struct list_head caching_block_groups;

    spinlock_t delayed_iput_lock;
    struct list_head delayed_iputs;

    /* this protects tree_mod_seq_list */
    spinlock_t tree_mod_seq_lock;
    atomic_t tree_mod_seq;
    struct list_head tree_mod_seq_list;
    struct seq_list tree_mod_seq_elem;

    /* this protects tree_mod_log */
    rwlock_t tree_mod_log_lock;
    struct rb_root tree_mod_log;

    atomic_t nr_async_submits;
    atomic_t async_submit_draining;
    atomic_t nr_async_bios;
    atomic_t async_delalloc_pages;
    atomic_t open_ioctl_trans;

    /*
     * this is used by the balancing code to wait for all the pending
     * ordered extents
     */
    spinlock_t ordered_extent_lock;

    /*
     * all of the data=ordered extents pending writeback
     * these can span multiple transactions and basically include
     * every dirty data page that isn't from nodatacow
     */
    struct list_head ordered_extents;

    /*
     * all of the inodes that have delalloc bytes.  It is possible for
     * this list to be empty even when there is still dirty data=ordered
     * extents waiting to finish IO.
     */
    struct list_head delalloc_inodes;

    /*
     * special rename and truncate targets that must be on disk before
     * we're allowed to commit.  This is basically the ext3 style
     * data=ordered list.
     */
    struct list_head ordered_operations;

    /*
     * there is a pool of worker threads for checksumming during writes
     * and a pool for checksumming after reads.  This is because readers
     * can run with FS locks held, and the writers may be waiting for
     * those locks.  We don't want ordering in the pending list to cause
     * deadlocks, and so the two are serviced separately.
     *
     * A third pool does submit_bio to avoid deadlocking with the other
     * two
     */
    struct btrfs_workers generic_worker;
    struct btrfs_workers workers;
    struct btrfs_workers delalloc_workers;
    struct btrfs_workers endio_workers;
    struct btrfs_workers endio_meta_workers;
    struct btrfs_workers endio_meta_write_workers;
    struct btrfs_workers endio_write_workers;
    struct btrfs_workers endio_freespace_worker;
    struct btrfs_workers submit_workers;
    struct btrfs_workers caching_workers;
    struct btrfs_workers readahead_workers;

    /*
     * fixup workers take dirty pages that didn't properly go through
     * the cow mechanism and make them safe to write.  It happens
     * for the sys_munmap function call path
     */
    struct btrfs_workers fixup_workers;
    struct btrfs_workers delayed_workers;
    struct task_struct *transaction_kthread;
    struct task_struct *cleaner_kthread;
    int thread_pool_size;

    struct kobject super_kobj;
    struct completion kobj_unregister;
    int do_barriers;
    int closing;
    int log_root_recovering;
    int enospc_unlink;
    int trans_no_join;

    u64 total_pinned;

    /* protected by the delalloc lock, used to keep from writing
     * metadata until there is a nice batch
     */
    u64 dirty_metadata_bytes;
    struct list_head dirty_cowonly_roots;

    struct btrfs_fs_devices *fs_devices;

    /*
     * the space_info list is almost entirely read only.  It only changes
     * when we add a new raid type to the FS, and that happens
     * very rarely.  RCU is used to protect it.
     */
    struct list_head space_info;

    struct btrfs_space_info *data_sinfo;

    struct reloc_control *reloc_ctl;

    spinlock_t delalloc_lock;
    u64 delalloc_bytes;

    /* data_alloc_cluster is only used in ssd mode */
    struct btrfs_free_cluster data_alloc_cluster;

    /* all metadata allocations go through this cluster */
    struct btrfs_free_cluster meta_alloc_cluster;

    /* auto defrag inodes go here */
    spinlock_t defrag_inodes_lock;
    struct rb_root defrag_inodes;
    atomic_t defrag_running;

    /*
     * these three are in extended format (availability of single
     * chunks is denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE bit, other
     * types are denoted by corresponding BTRFS_BLOCK_GROUP_* bits)
     */
    u64 avail_data_alloc_bits;
    u64 avail_metadata_alloc_bits;
    u64 avail_system_alloc_bits;

    /* restriper state */
    spinlock_t balance_lock;
    struct mutex balance_mutex;
    atomic_t balance_running;
    atomic_t balance_pause_req;
    atomic_t balance_cancel_req;
    struct btrfs_balance_control *balance_ctl;
    wait_queue_head_t balance_wait_q;

    unsigned data_chunk_allocations;
    unsigned metadata_ratio;

    void *bdev_holder;

    /* private scrub information */
    struct mutex scrub_lock;
    atomic_t scrubs_running;
    atomic_t scrub_pause_req;
    atomic_t scrubs_paused;
    atomic_t scrub_cancel_req;
    wait_queue_head_t scrub_pause_wait;
    struct rw_semaphore scrub_super_lock;
    int scrub_workers_refcnt;
    struct btrfs_workers scrub_workers;

#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
    u32 check_integrity_print_mask;
#endif
    /*
     * quota information
     */
    unsigned int quota_enabled:1;

    /*
     * quota_enabled only changes state after a commit. This holds the
     * next state.
     */
    unsigned int pending_quota_state:1;

    /* is qgroup tracking in a consistent state? */
    u64 qgroup_flags;

    /* holds configuration and tracking. Protected by qgroup_lock */
    struct rb_root qgroup_tree;
    spinlock_t qgroup_lock;

    /* list of dirty qgroups to be written at next commit */
    struct list_head dirty_qgroups;

    /* used by btrfs_qgroup_record_ref for an efficient tree traversal */
    u64 qgroup_seq;

    /* filesystem state */
    u64 fs_state;

    struct btrfs_delayed_root *delayed_root;

    /* readahead tree */
    spinlock_t reada_lock;
    struct radix_tree_root reada_tree;

    /* next backup root to be overwritten */
    int backup_root_index;

    int num_tolerated_disk_barrier_failures;
};

/*
 * in ram representation of the tree.  extent_root is used for all allocations
 * and for the extent tree extent_root root.
 */
struct btrfs_root {
    struct extent_buffer *node;

    struct extent_buffer *commit_root;
    struct btrfs_root *log_root;
    struct btrfs_root *reloc_root;

    struct btrfs_root_item root_item;
    struct btrfs_key root_key;
    struct btrfs_fs_info *fs_info;
    struct extent_io_tree dirty_log_pages;

    struct kobject root_kobj;
    struct completion kobj_unregister;
    struct mutex objectid_mutex;

    spinlock_t accounting_lock;
    struct btrfs_block_rsv *block_rsv;

    /* free ino cache stuff */
    struct mutex fs_commit_mutex;
    struct btrfs_free_space_ctl *free_ino_ctl;
    enum btrfs_caching_type cached;
    spinlock_t cache_lock;
    wait_queue_head_t cache_wait;
    struct btrfs_free_space_ctl *free_ino_pinned;
    u64 cache_progress;
    struct inode *cache_inode;

    struct mutex log_mutex;
    wait_queue_head_t log_writer_wait;
    wait_queue_head_t log_commit_wait[2];
    atomic_t log_writers;
    atomic_t log_commit[2];
    atomic_t log_batch;
    unsigned long log_transid;
    unsigned long last_log_commit;
    pid_t log_start_pid;
    bool log_multiple_pids;

    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;

    u32 stripesize;

    u32 type;

    u64 highest_objectid;

    /* btrfs_record_root_in_trans is a multi-step process,
     * and it can race with the balancing code.   But the
     * race is very small, and only the first time the root
     * is added to each transaction.  So in_trans_setup
     * is used to tell us when more checks are required
     */
    unsigned long in_trans_setup;
    int ref_cows;
    int track_dirty;
    int in_radix;

    u64 defrag_trans_start;
    struct btrfs_key defrag_progress;
    struct btrfs_key defrag_max;
    int defrag_running;
    char *name;

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

    struct list_head root_list;

    spinlock_t orphan_lock;
    atomic_t orphan_inodes;
    struct btrfs_block_rsv *orphan_block_rsv;
    int orphan_item_inserted;
    int orphan_cleanup_state;

    spinlock_t inode_lock;
    /* red-black tree that keeps track of in-memory inodes */
    struct rb_root inode_tree;

    /*
     * radix tree that keeps track of delayed nodes of every inode,
     * protected by inode_lock
     */
    struct radix_tree_root delayed_nodes_tree;
    /*
     * right now this just gets used so that a root has its own devid
     * for stat.  It may be used for more later
     */
    dev_t anon_dev;

    int force_cow;

    spinlock_t root_times_lock;
};

struct btrfs_ioctl_defrag_range_args {
    /* start of the defrag operation */
    __u64 start;

    /* number of bytes to defrag, use (u64)-1 to say all */
    __u64 len;

    /*
     * flags for the operation, which can include turning
     * on compression for this one defrag
     */
    __u64 flags;

    /*
     * any extent bigger than this will be considered
     * already defragged.  Use 0 to take the kernel default
     * Use 1 to say every single extent must be rewritten
     */
    __u32 extent_thresh;

    /*
     * which compression method to use if turning on compression
     * for this defrag operation.  If unspecified, zlib will
     * be used
     */
    __u32 compress_type;

    /* spare for later */
    __u32 unused[4];
};


/*
 * 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_INODE_EXTREF_KEY      13
#define BTRFS_XATTR_ITEM_KEY        24
#define BTRFS_ORPHAN_ITEM_KEY       48
/* reserve 2-15 close to the inode for later flexibility */

/*
 * dir items are the name -> inode pointers in a directory.  There is one
 * for every name in a directory.
 */
#define BTRFS_DIR_LOG_ITEM_KEY  60
#define BTRFS_DIR_LOG_INDEX_KEY 72
#define BTRFS_DIR_ITEM_KEY  84
#define BTRFS_DIR_INDEX_KEY 96
/*
 * extent data is for file data
 */
#define BTRFS_EXTENT_DATA_KEY   108

/*
 * 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.  They 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

#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

/*
 * Records the overall state of the qgroups.
 * There's only one instance of this key present,
 * (0, BTRFS_QGROUP_STATUS_KEY, 0)
 */
#define BTRFS_QGROUP_STATUS_KEY         240
/*
 * Records the currently used space of the qgroup.
 * One key per qgroup, (0, BTRFS_QGROUP_INFO_KEY, qgroupid).
 */
#define BTRFS_QGROUP_INFO_KEY           242
/*
 * Contains the user configured limits for the qgroup.
 * One key per qgroup, (0, BTRFS_QGROUP_LIMIT_KEY, qgroupid).
 */
#define BTRFS_QGROUP_LIMIT_KEY          244
/*
 * Records the child-parent relationship of qgroups. For
 * each relation, 2 keys are present:
 * (childid, BTRFS_QGROUP_RELATION_KEY, parentid)
 * (parentid, BTRFS_QGROUP_RELATION_KEY, childid)
 */
#define BTRFS_QGROUP_RELATION_KEY       246

#define BTRFS_BALANCE_ITEM_KEY  248

/*
 * Persistantly stores the io stats in the device tree.
 * One key for all stats, (0, BTRFS_DEV_STATS_KEY, devid).
 */
#define BTRFS_DEV_STATS_KEY 249

/*
 * string items are for debugging.  They just store a short string of
 * data in the FS
 */
#define BTRFS_STRING_ITEM_KEY   253

/*
 * Flags for mount options.
 *
 * Note: don't forget to add new options to btrfs_show_options()
 */
#define BTRFS_MOUNT_NODATASUM       (1 << 0)
#define BTRFS_MOUNT_NODATACOW       (1 << 1)
#define BTRFS_MOUNT_NOBARRIER       (1 << 2)
#define BTRFS_MOUNT_SSD         (1 << 3)
#define BTRFS_MOUNT_DEGRADED        (1 << 4)
#define BTRFS_MOUNT_COMPRESS        (1 << 5)
#define BTRFS_MOUNT_NOTREELOG           (1 << 6)
#define BTRFS_MOUNT_FLUSHONCOMMIT       (1 << 7)
#define BTRFS_MOUNT_SSD_SPREAD      (1 << 8)
#define BTRFS_MOUNT_NOSSD       (1 << 9)
#define BTRFS_MOUNT_DISCARD     (1 << 10)
#define BTRFS_MOUNT_FORCE_COMPRESS      (1 << 11)
#define BTRFS_MOUNT_SPACE_CACHE     (1 << 12)
#define BTRFS_MOUNT_CLEAR_CACHE     (1 << 13)
#define BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED (1 << 14)
#define BTRFS_MOUNT_ENOSPC_DEBUG     (1 << 15)
#define BTRFS_MOUNT_AUTO_DEFRAG     (1 << 16)
#define BTRFS_MOUNT_INODE_MAP_CACHE (1 << 17)
#define BTRFS_MOUNT_RECOVERY        (1 << 18)
#define BTRFS_MOUNT_SKIP_BALANCE    (1 << 19)
#define BTRFS_MOUNT_CHECK_INTEGRITY (1 << 20)
#define BTRFS_MOUNT_CHECK_INTEGRITY_INCLUDING_EXTENT_DATA (1 << 21)
#define BTRFS_MOUNT_PANIC_ON_FATAL_ERROR    (1 << 22)

#define btrfs_clear_opt(o, opt)     ((o) &= ~BTRFS_MOUNT_##opt)
#define btrfs_set_opt(o, opt)       ((o) |= BTRFS_MOUNT_##opt)
#define btrfs_test_opt(root, opt)   ((root)->fs_info->mount_opt & \
                     BTRFS_MOUNT_##opt)
/*
 * Inode flags
 */
#define BTRFS_INODE_NODATASUM       (1 << 0)
#define BTRFS_INODE_NODATACOW       (1 << 1)
#define BTRFS_INODE_READONLY        (1 << 2)
#define BTRFS_INODE_NOCOMPRESS      (1 << 3)
#define BTRFS_INODE_PREALLOC        (1 << 4)
#define BTRFS_INODE_SYNC        (1 << 5)
#define BTRFS_INODE_IMMUTABLE       (1 << 6)
#define BTRFS_INODE_APPEND      (1 << 7)
#define BTRFS_INODE_NODUMP      (1 << 8)
#define BTRFS_INODE_NOATIME     (1 << 9)
#define BTRFS_INODE_DIRSYNC     (1 << 10)
#define BTRFS_INODE_COMPRESS        (1 << 11)

#define BTRFS_INODE_ROOT_ITEM_INIT  (1 << 31)

struct btrfs_map_token {
    struct extent_buffer *eb;
    char *kaddr;
    unsigned long offset;
};

static inline void btrfs_init_map_token (struct btrfs_map_token *token)
{
    memset(token, 0, sizeof(*token));
}

/* some macros to generate set/get funcs for the struct fields.  This
 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
 * one for u8:
 */
#define le8_to_cpu(v) (v)
#define cpu_to_le8(v) (v)
#define __le8 u8

#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 DECLARE_BTRFS_SETGET_BITS(bits)                 \
u##bits btrfs_get_token_##bits(struct extent_buffer *eb, void *ptr, \
                   unsigned long off,           \
                              struct btrfs_map_token *token);       \
void btrfs_set_token_##bits(struct extent_buffer *eb, void *ptr,    \
                unsigned long off, u##bits val,     \
                struct btrfs_map_token *token);     \
static inline u##bits btrfs_get_##bits(struct extent_buffer *eb, void *ptr, \
                       unsigned long off)       \
{                                   \
    return btrfs_get_token_##bits(eb, ptr, off, NULL);      \
}                                   \
static inline void btrfs_set_##bits(struct extent_buffer *eb, void *ptr, \
                    unsigned long off, u##bits val) \
{                                   \
       btrfs_set_token_##bits(eb, ptr, off, val, NULL);         \
}

DECLARE_BTRFS_SETGET_BITS(8)
DECLARE_BTRFS_SETGET_BITS(16)
DECLARE_BTRFS_SETGET_BITS(32)
DECLARE_BTRFS_SETGET_BITS(64)

#define BTRFS_SETGET_FUNCS(name, type, member, bits)            \
static inline u##bits btrfs_##name(struct extent_buffer *eb, type *s)   \
{                                   \
    BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
    return btrfs_get_##bits(eb, s, offsetof(type, member));     \
}                                   \
static inline void btrfs_set_##name(struct extent_buffer *eb, type *s,  \
                    u##bits val)            \
{                                   \
    BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
    btrfs_set_##bits(eb, s, offsetof(type, member), val);       \
}                                   \
static inline u##bits btrfs_token_##name(struct extent_buffer *eb, type *s, \
                     struct btrfs_map_token *token) \
{                                   \
    BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
    return btrfs_get_token_##bits(eb, s, offsetof(type, member), token); \
}                                   \
static inline void btrfs_set_token_##name(struct extent_buffer *eb, \
                      type *s, u##bits val,     \
                                         struct btrfs_map_token *token) \
{                                   \
    BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member);   \
    btrfs_set_token_##bits(eb, s, offsetof(type, member), val, token); \
}

#define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits)     \
static inline u##bits btrfs_##name(struct extent_buffer *eb)        \
{                                   \
    type *p = page_address(eb->pages[0]);               \
    u##bits res = le##bits##_to_cpu(p->member);         \
    return res;                         \
}                                   \
static inline void btrfs_set_##name(struct extent_buffer *eb,       \
                    u##bits val)            \
{                                   \
    type *p = page_address(eb->pages[0]);               \
    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 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));
}

/* 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_extref */
BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
           parent_objectid, 64);
BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
           name_len, 16);
BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, 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);

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;
}

BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
BTRFS_SETGET_FUNCS(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);
}

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;
}

void btrfs_node_key(struct extent_buffer *eb,
            struct btrfs_disk_key *disk_key, int nr);

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);
}

BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
           num_entries, 64);
BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
           num_bitmaps, 64);
BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
           generation, 64);

static inline void btrfs_free_space_key(struct extent_buffer *eb,
                    struct btrfs_free_space_header *h,
                    struct btrfs_disk_key *key)
{
    read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
}

static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
                        struct btrfs_free_space_header *h,
                        struct btrfs_disk_key *key)
{
    write_eb_member(eb, h, struct btrfs_free_space_header, 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 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);
BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
             generation_v2, 64);
BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
             ctransid, 64);
BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
             otransid, 64);
BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
             stransid, 64);
BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
             rtransid, 64);

static inline bool btrfs_root_readonly(struct btrfs_root *root)
{
    return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0;
}

/* struct btrfs_root_backup */
BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
           tree_root, 64);
BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
           tree_root_gen, 64);
BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
           tree_root_level, 8);

BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
           chunk_root, 64);
BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
           chunk_root_gen, 64);
BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
           chunk_root_level, 8);

BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
           extent_root, 64);
BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
           extent_root_gen, 64);
BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
           extent_root_level, 8);

BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
           fs_root, 64);
BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
           fs_root_gen, 64);
BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
           fs_root_level, 8);

BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
           dev_root, 64);
BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
           dev_root_gen, 64);
BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
           dev_root_level, 8);

BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
           csum_root, 64);
BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
           csum_root_gen, 64);
BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
           csum_root_level, 8);
BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
           total_bytes, 64);
BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
           bytes_used, 64);
BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
           num_devices, 64);

/* struct btrfs_balance_item */
BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64);

static inline void btrfs_balance_data(struct extent_buffer *eb,
                      struct btrfs_balance_item *bi,
                      struct btrfs_disk_balance_args *ba)
{
    read_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
}

static inline void btrfs_set_balance_data(struct extent_buffer *eb,
                      struct btrfs_balance_item *bi,
                      struct btrfs_disk_balance_args *ba)
{
    write_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
}

static inline void btrfs_balance_meta(struct extent_buffer *eb,
                      struct btrfs_balance_item *bi,
                      struct btrfs_disk_balance_args *ba)
{
    read_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
}

static inline void btrfs_set_balance_meta(struct extent_buffer *eb,
                      struct btrfs_balance_item *bi,
                      struct btrfs_disk_balance_args *ba)
{
    write_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
}

static inline void btrfs_balance_sys(struct extent_buffer *eb,
                     struct btrfs_balance_item *bi,
                     struct btrfs_disk_balance_args *ba)
{
    read_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
}

static inline void btrfs_set_balance_sys(struct extent_buffer *eb,
                     struct btrfs_balance_item *bi,
                     struct btrfs_disk_balance_args *ba)
{
    write_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
}

static inline void
btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu,
                   struct btrfs_disk_balance_args *disk)
{
    memset(cpu, 0, sizeof(*cpu));

    cpu->profiles = le64_to_cpu(disk->profiles);
    cpu->usage = le64_to_cpu(disk->usage);
    cpu->devid = le64_to_cpu(disk->devid);
    cpu->pstart = le64_to_cpu(disk->pstart);
    cpu->pend = le64_to_cpu(disk->pend);
    cpu->vstart = le64_to_cpu(disk->vstart);
    cpu->vend = le64_to_cpu(disk->vend);
    cpu->target = le64_to_cpu(disk->target);
    cpu->flags = le64_to_cpu(disk->flags);
}

static inline void
btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args *disk,
                   struct btrfs_balance_args *cpu)
{
    memset(disk, 0, sizeof(*disk));

    disk->profiles = cpu_to_le64(cpu->profiles);
    disk->usage = cpu_to_le64(cpu->usage);
    disk->devid = cpu_to_le64(cpu->devid);
    disk->pstart = cpu_to_le64(cpu->pstart);
    disk->pend = cpu_to_le64(cpu->pend);
    disk->vstart = cpu_to_le64(cpu->vstart);
    disk->vend = cpu_to_le64(cpu->vend);
    disk->target = cpu_to_le64(cpu->target);
    disk->flags = cpu_to_le64(cpu->flags);
}

/* 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_ro_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);
BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
             cache_generation, 64);

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;
}

/* btrfs_dev_stats_item */
static inline u64 btrfs_dev_stats_value(struct extent_buffer *eb,
                    struct btrfs_dev_stats_item *ptr,
                    int index)
{
    u64 val;

    read_extent_buffer(eb, &val,
               offsetof(struct btrfs_dev_stats_item, values) +
                ((unsigned long)ptr) + (index * sizeof(u64)),
               sizeof(val));
    return val;
}

static inline void btrfs_set_dev_stats_value(struct extent_buffer *eb,
                         struct btrfs_dev_stats_item *ptr,
                         int index, u64 val)
{
    write_extent_buffer(eb, &val,
                offsetof(struct btrfs_dev_stats_item, values) +
                 ((unsigned long)ptr) + (index * sizeof(u64)),
                sizeof(val));
}

/* btrfs_qgroup_status_item */
BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
           generation, 64);
BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
           version, 64);
BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
           flags, 64);
BTRFS_SETGET_FUNCS(qgroup_status_scan, struct btrfs_qgroup_status_item,
           scan, 64);

/* btrfs_qgroup_info_item */
BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
           generation, 64);
BTRFS_SETGET_FUNCS(qgroup_info_rfer, struct btrfs_qgroup_info_item, rfer, 64);
BTRFS_SETGET_FUNCS(qgroup_info_rfer_cmpr, struct btrfs_qgroup_info_item,
           rfer_cmpr, 64);
BTRFS_SETGET_FUNCS(qgroup_info_excl, struct btrfs_qgroup_info_item, excl, 64);
BTRFS_SETGET_FUNCS(qgroup_info_excl_cmpr, struct btrfs_qgroup_info_item,
           excl_cmpr, 64);

BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
             struct btrfs_qgroup_info_item, generation, 64);
BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer, struct btrfs_qgroup_info_item,
             rfer, 64);
BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer_cmpr,
             struct btrfs_qgroup_info_item, rfer_cmpr, 64);
BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl, struct btrfs_qgroup_info_item,
             excl, 64);
BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl_cmpr,
             struct btrfs_qgroup_info_item, excl_cmpr, 64);

/* btrfs_qgroup_limit_item */
BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
           flags, 64);
BTRFS_SETGET_FUNCS(qgroup_limit_max_rfer, struct btrfs_qgroup_limit_item,
           max_rfer, 64);
BTRFS_SETGET_FUNCS(qgroup_limit_max_excl, struct btrfs_qgroup_limit_item,
           max_excl, 64);
BTRFS_SETGET_FUNCS(qgroup_limit_rsv_rfer, struct btrfs_qgroup_limit_item,
           rsv_rfer, 64);
BTRFS_SETGET_FUNCS(qgroup_limit_rsv_excl, struct btrfs_qgroup_limit_item,
           rsv_excl, 64);

static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb)
{
    return sb->s_fs_info;
}

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)))

static inline struct dentry *fdentry(struct file *file)
{
    return file->f_path.dentry;
}

static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info)
{
    return ((space_info->flags & BTRFS_BLOCK_GROUP_METADATA) &&
        (space_info->flags & BTRFS_BLOCK_GROUP_DATA));
}

static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping)
{
    return mapping_gfp_mask(mapping) & ~__GFP_FS;
}

/* extent-tree.c */
static inline u64 btrfs_calc_trans_metadata_size(struct btrfs_root *root,
                         unsigned num_items)
{
    return (root->leafsize + root->nodesize * (BTRFS_MAX_LEVEL - 1)) *
        3 * num_items;
}

/*
 * Doing a truncate won't result in new nodes or leaves, just what we need for
 * COW.
 */
static inline u64 btrfs_calc_trunc_metadata_size(struct btrfs_root *root,
                         unsigned num_items)
{
    return (root->leafsize + root->nodesize * (BTRFS_MAX_LEVEL - 1)) *
        num_items;
}

void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
               struct btrfs_root *root, unsigned long count);
int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len);
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_pin_extent(struct btrfs_root *root,
             u64 bytenr, u64 num, int reserved);
int btrfs_pin_extent_for_log_replay(struct btrfs_trans_handle *trans,
                    struct btrfs_root *root,
                    u64 bytenr, u64 num_bytes);
int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans,
              struct btrfs_root *root,
              u64 objectid, u64 offset, u64 bytenr);
struct btrfs_block_group_cache *btrfs_lookup_block_group(
                         struct btrfs_fs_info *info,
                         u64 bytenr);
void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
u64 btrfs_find_block_group(struct btrfs_root *root,
               u64 search_start, u64 search_hint, int owner);
struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
                    struct btrfs_root *root, u32 blocksize,
                    u64 parent, u64 root_objectid,
                    struct btrfs_disk_key *key, int level,
                    u64 hint, u64 empty_size);
void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
               struct btrfs_root *root,
               struct extent_buffer *buf,
               u64 parent, int last_ref);
struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans,
                        struct btrfs_root *root,
                        u64 bytenr, u32 blocksize,
                        int level);
int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
                     struct btrfs_root *root,
                     u64 root_objectid, u64 owner,
                     u64 offset, struct btrfs_key *ins);
int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
                   struct btrfs_root *root,
                   u64 root_objectid, u64 owner, u64 offset,
                   struct btrfs_key *ins);
int btrfs_reserve_extent(struct btrfs_trans_handle *trans,
                  struct btrfs_root *root,
                  u64 num_bytes, u64 min_alloc_size,
                  u64 empty_size, u64 hint_byte,
                  struct btrfs_key *ins, u64 data);
int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
          struct extent_buffer *buf, int full_backref, int for_cow);
int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
          struct extent_buffer *buf, int full_backref, int for_cow);
int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
                struct btrfs_root *root,
                u64 bytenr, u64 num_bytes, u64 flags,
                int is_data);
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 for_cow);

int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len);
int btrfs_free_and_pin_reserved_extent(struct btrfs_root *root,
                       u64 start, u64 len);
void btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans,
                 struct btrfs_root *root);
int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
                   struct btrfs_root *root);
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 owner, u64 offset, int for_cow);

int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
                    struct btrfs_root *root);
int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr);
int btrfs_free_block_groups(struct btrfs_fs_info *info);
int btrfs_read_block_groups(struct btrfs_root *root);
int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr);
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_remove_block_group(struct btrfs_trans_handle *trans,
                 struct btrfs_root *root, u64 group_start);
void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans,
                       struct btrfs_root *root);
u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags);
u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data);
void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
int btrfs_check_data_free_space(struct inode *inode, u64 bytes);
void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes);
void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans,
                struct btrfs_root *root);
int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans,
                  struct inode *inode);
void btrfs_orphan_release_metadata(struct inode *inode);
int btrfs_snap_reserve_metadata(struct btrfs_trans_handle *trans,
                struct btrfs_pending_snapshot *pending);
int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes);
void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes);
int btrfs_delalloc_reserve_space(struct inode *inode, u64 num_bytes);
void btrfs_delalloc_release_space(struct inode *inode, u64 num_bytes);
void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type);
struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root,
                          unsigned short type);
void btrfs_free_block_rsv(struct btrfs_root *root,
              struct btrfs_block_rsv *rsv);
int btrfs_block_rsv_add(struct btrfs_root *root,
            struct btrfs_block_rsv *block_rsv,
            u64 num_bytes);
int btrfs_block_rsv_add_noflush(struct btrfs_root *root,
                struct btrfs_block_rsv *block_rsv,
                u64 num_bytes);
int btrfs_block_rsv_check(struct btrfs_root *root,
              struct btrfs_block_rsv *block_rsv, int min_factor);
int btrfs_block_rsv_refill(struct btrfs_root *root,
              struct btrfs_block_rsv *block_rsv,
              u64 min_reserved);
int btrfs_block_rsv_refill_noflush(struct btrfs_root *root,
                   struct btrfs_block_rsv *block_rsv,
                   u64 min_reserved);
int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv,
                struct btrfs_block_rsv *dst_rsv,
                u64 num_bytes);
void btrfs_block_rsv_release(struct btrfs_root *root,
                 struct btrfs_block_rsv *block_rsv,
                 u64 num_bytes);
int btrfs_set_block_group_ro(struct btrfs_root *root,
                 struct btrfs_block_group_cache *cache);
void btrfs_set_block_group_rw(struct btrfs_root *root,
                  struct btrfs_block_group_cache *cache);
void btrfs_put_block_group_cache(struct btrfs_fs_info *info);
u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo);
int btrfs_error_unpin_extent_range(struct btrfs_root *root,
                   u64 start, u64 end);
int btrfs_error_discard_extent(struct btrfs_root *root, u64 bytenr,
                   u64 num_bytes, u64 *actual_bytes);
int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans,
                struct btrfs_root *root, u64 type);
int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range);

int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans,
                     struct btrfs_fs_info *fs_info);
/* ctree.c */
int btrfs_bin_search(struct extent_buffer *eb, struct btrfs_key *key,
             int level, int *slot);
int btrfs_comp_cpu_keys(struct btrfs_key *k1, struct btrfs_key *k2);
int btrfs_previous_item(struct btrfs_root *root,
            struct btrfs_path *path, u64 min_objectid,
            int type);
void btrfs_set_item_key_safe(struct btrfs_trans_handle *trans,
                 struct btrfs_root *root, struct btrfs_path *path,
                 struct btrfs_key *new_key);
struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root);
int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
            struct btrfs_key *key, int lowest_level,
            int cache_only, u64 min_trans);
int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
             struct btrfs_key *max_key,
             struct btrfs_path *path, int cache_only,
             u64 min_trans);
enum btrfs_compare_tree_result {
    BTRFS_COMPARE_TREE_NEW,
    BTRFS_COMPARE_TREE_DELETED,
    BTRFS_COMPARE_TREE_CHANGED,
};
typedef int (*btrfs_changed_cb_t)(struct btrfs_root *left_root,
                  struct btrfs_root *right_root,
                  struct btrfs_path *left_path,
                  struct btrfs_path *right_path,
                  struct btrfs_key *key,
                  enum btrfs_compare_tree_result result,
                  void *ctx);
int btrfs_compare_trees(struct btrfs_root *left_root,
            struct btrfs_root *right_root,
            btrfs_changed_cb_t cb, void *ctx);
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_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_block_can_be_shared(struct btrfs_root *root,
                  struct extent_buffer *buf);
void btrfs_extend_item(struct btrfs_trans_handle *trans,
               struct btrfs_root *root, struct btrfs_path *path,
               u32 data_size);
void 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_duplicate_item(struct btrfs_trans_handle *trans,
             struct btrfs_root *root,
             struct btrfs_path *path,
             struct btrfs_key *new_key);
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_search_old_slot(struct btrfs_root *root, struct btrfs_key *key,
              struct btrfs_path *p, u64 time_seq);
int btrfs_search_slot_for_read(struct btrfs_root *root,
                   struct btrfs_key *key, struct btrfs_path *p,
                   int find_higher, int return_any);
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_path *p);
struct btrfs_path *btrfs_alloc_path(void);
void btrfs_free_path(struct btrfs_path *p);
void btrfs_set_path_blocking(struct btrfs_path *p);
void btrfs_clear_path_blocking(struct btrfs_path *p,
                   struct extent_buffer *held, int held_rw);
void btrfs_unlock_up_safe(struct btrfs_path *p, int level);

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);
}

void setup_items_for_insert(struct btrfs_trans_handle *trans,
                struct btrfs_root *root, struct btrfs_path *path,
                struct btrfs_key *cpu_key, u32 *data_size,
                u32 total_data, u32 total_size, int nr);
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_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path,
            u64 time_seq);
static inline int btrfs_next_old_item(struct btrfs_root *root,
                      struct btrfs_path *p, u64 time_seq)
{
    ++p->slots[0];
    if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
        return btrfs_next_old_leaf(root, p, time_seq);
    return 0;
}
static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p)
{
    return btrfs_next_old_item(root, p, 0);
}
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 __must_check btrfs_drop_snapshot(struct btrfs_root *root,
                     struct btrfs_block_rsv *block_rsv,
                     int update_ref, int for_reloc);
int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
            struct btrfs_root *root,
            struct extent_buffer *node,
            struct extent_buffer *parent);
static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
{
    /*
     * Get synced with close_ctree()
     */
    smp_mb();
    return fs_info->closing;
}
static inline void free_fs_info(struct btrfs_fs_info *fs_info)
{
    kfree(fs_info->balance_ctl);
    kfree(fs_info->delayed_root);
    kfree(fs_info->extent_root);
    kfree(fs_info->tree_root);
    kfree(fs_info->chunk_root);
    kfree(fs_info->dev_root);
    kfree(fs_info->csum_root);
    kfree(fs_info->quota_root);
    kfree(fs_info->super_copy);
    kfree(fs_info->super_for_commit);
    kfree(fs_info);
}

/* tree mod log functions from ctree.c */
u64 btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info,
               struct seq_list *elem);
void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info,
                struct seq_list *elem);
static inline u64 btrfs_inc_tree_mod_seq(struct btrfs_fs_info *fs_info)
{
    return atomic_inc_return(&fs_info->tree_mod_seq);
}
int btrfs_old_root_level(struct btrfs_root *root, u64 time_seq);

/* root-item.c */
int btrfs_find_root_ref(struct btrfs_root *tree_root,
            struct btrfs_path *path,
            u64 root_id, u64 ref_id);
int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
               struct btrfs_root *tree_root,
               u64 root_id, u64 ref_id, u64 dirid, u64 sequence,
               const char *name, int name_len);
int btrfs_del_root_ref(struct btrfs_trans_handle *trans,
               struct btrfs_root *tree_root,
               u64 root_id, 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 __must_check btrfs_update_root(struct btrfs_trans_handle *trans,
                   struct btrfs_root *root,
                   struct btrfs_key *key,
                   struct btrfs_root_item *item);
void btrfs_read_root_item(struct btrfs_root *root,
             struct extent_buffer *eb, int slot,
             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);
int btrfs_find_orphan_roots(struct btrfs_root *tree_root);
void btrfs_set_root_node(struct btrfs_root_item *item,
             struct extent_buffer *node);
void btrfs_check_and_init_root_item(struct btrfs_root_item *item);
void btrfs_update_root_times(struct btrfs_trans_handle *trans,
                 struct btrfs_root *root);

/* dir-item.c */
int btrfs_insert_dir_item(struct btrfs_trans_handle *trans,
              struct btrfs_root *root, const char *name,
              int name_len, struct inode *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_search_dir_index_item(struct btrfs_root *root,
                struct btrfs_path *path, u64 dirid,
                const char *name, int name_len);
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,
                struct btrfs_path *path, u64 objectid,
                const char *name, u16 name_len,
                const void *data, u16 data_len);
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);
int verify_dir_item(struct btrfs_root *root,
            struct extent_buffer *leaf,
            struct btrfs_dir_item *dir_item);

/* orphan.c */
int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
                 struct btrfs_root *root, u64 offset);
int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
              struct btrfs_root *root, u64 offset);
int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset);

/* 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, u64 *index);
int btrfs_get_inode_ref_index(struct btrfs_trans_handle *trans,
                  struct btrfs_root *root,
                  struct btrfs_path *path,
                  const char *name, int name_len,
                  u64 inode_objectid, u64 ref_objectid, int mod,
                  u64 *ret_index);
int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
                 struct btrfs_root *root,
                 struct btrfs_path *path, u64 objectid);
int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
               *root, struct btrfs_path *path,
               struct btrfs_key *location, int mod);

struct btrfs_inode_extref *
btrfs_lookup_inode_extref(struct btrfs_trans_handle *trans,
              struct btrfs_root *root,
              struct btrfs_path *path,
              const char *name, int name_len,
              u64 inode_objectid, u64 ref_objectid, int ins_len,
              int cow);

int btrfs_find_name_in_ext_backref(struct btrfs_path *path,
                   u64 ref_objectid, const char *name,
                   int name_len,
                   struct btrfs_inode_extref **extref_ret);

/* file-item.c */
int btrfs_del_csums(struct btrfs_trans_handle *trans,
            struct btrfs_root *root, u64 bytenr, u64 len);
int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode,
              struct bio *bio, u32 *dst);
int btrfs_lookup_bio_sums_dio(struct btrfs_root *root, struct inode *inode,
                  struct bio *bio, u64 logical_offset);
int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
                 struct btrfs_root *root,
                 u64 objectid, u64 pos,
                 u64 disk_offset, u64 disk_num_bytes,
                 u64 num_bytes, u64 offset, u64 ram_bytes,
                 u8 compression, u8 encryption, u16 other_encoding);
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_blocks(struct btrfs_trans_handle *trans,
               struct btrfs_root *root,
               struct btrfs_ordered_sum *sums);
int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
               struct bio *bio, u64 file_start, int contig);
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);
int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
                 struct list_head *list, int search_commit);
/* inode.c */
struct extent_map *btrfs_get_extent_fiemap(struct inode *inode, struct page *page,
                       size_t pg_offset, u64 start, u64 len,
                       int create);

/* RHEL and EL kernels have a patch that renames PG_checked to FsMisc */
#if defined(ClearPageFsMisc) && !defined(ClearPageChecked)
#define ClearPageChecked ClearPageFsMisc
#define SetPageChecked SetPageFsMisc
#define PageChecked PageFsMisc
#endif

/* This forces readahead on a given range of bytes in an inode */
static inline void btrfs_force_ra(struct address_space *mapping,
                  struct file_ra_state *ra, struct file *file,
                  pgoff_t offset, unsigned long req_size)
{
    page_cache_sync_readahead(mapping, ra, file, offset, req_size);
}

struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
int btrfs_set_inode_index(struct inode *dir, u64 *index);
int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
               struct btrfs_root *root,
               struct inode *dir, struct inode *inode,
               const char *name, int name_len);
int btrfs_add_link(struct btrfs_trans_handle *trans,
           struct inode *parent_inode, struct inode *inode,
           const char *name, int name_len, int add_backref, u64 index);
int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
            struct btrfs_root *root,
            struct inode *dir, u64 objectid,
            const char *name, int name_len);
int btrfs_truncate_page(struct inode *inode, loff_t from, loff_t len,
            int front);
int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
                   struct btrfs_root *root,
                   struct inode *inode, u64 new_size,
                   u32 min_type);

int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput);
int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end,
                  struct extent_state **cached_state);
int btrfs_writepages(struct address_space *mapping,
             struct writeback_control *wbc);
int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
                 struct btrfs_root *new_root, u64 new_dirid);
int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
             size_t size, struct bio *bio, unsigned long bio_flags);

int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
int btrfs_readpage(struct file *file, struct page *page);
void btrfs_evict_inode(struct inode *inode);
int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc);
int btrfs_dirty_inode(struct inode *inode);
struct inode *btrfs_alloc_inode(struct super_block *sb);
void btrfs_destroy_inode(struct inode *inode);
int btrfs_drop_inode(struct inode *inode);
int btrfs_init_cachep(void);
void btrfs_destroy_cachep(void);
long btrfs_ioctl_trans_end(struct file *file);
struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
             struct btrfs_root *root, int *was_new);
struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
                    size_t pg_offset, u64 start, u64 end,
                    int create);
int btrfs_update_inode(struct btrfs_trans_handle *trans,
                  struct btrfs_root *root,
                  struct inode *inode);
int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans,
                struct btrfs_root *root, struct inode *inode);
int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode);
int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode);
int btrfs_orphan_cleanup(struct btrfs_root *root);
void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans,
                  struct btrfs_root *root);
int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size);
void btrfs_invalidate_inodes(struct btrfs_root *root);
void btrfs_add_delayed_iput(struct inode *inode);
void btrfs_run_delayed_iputs(struct btrfs_root *root);
int btrfs_prealloc_file_range(struct inode *inode, int mode,
                  u64 start, u64 num_bytes, u64 min_size,
                  loff_t actual_len, u64 *alloc_hint);
int btrfs_prealloc_file_range_trans(struct inode *inode,
                    struct btrfs_trans_handle *trans, int mode,
                    u64 start, u64 num_bytes, u64 min_size,
                    loff_t actual_len, u64 *alloc_hint);
extern const struct dentry_operations btrfs_dentry_operations;

/* ioctl.c */
long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
void btrfs_update_iflags(struct inode *inode);
void btrfs_inherit_iflags(struct inode *inode, struct inode *dir);
int btrfs_defrag_file(struct inode *inode, struct file *file,
              struct btrfs_ioctl_defrag_range_args *range,
              u64 newer_than, unsigned long max_pages);
void btrfs_get_block_group_info(struct list_head *groups_list,
                struct btrfs_ioctl_space_info *space);

/* file.c */
int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans,
               struct inode *inode);
int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info);
int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync);
void btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
                 int skip_pinned);
int btrfs_replace_extent_cache(struct inode *inode, struct extent_map *replace,
                   u64 start, u64 end, int skip_pinned,
                   int modified);
extern const struct file_operations btrfs_file_operations;
int __btrfs_drop_extents(struct btrfs_trans_handle *trans,
             struct btrfs_root *root, struct inode *inode,
             struct btrfs_path *path, u64 start, u64 end,
             u64 *drop_end, int drop_cache);
int btrfs_drop_extents(struct btrfs_trans_handle *trans,
               struct btrfs_root *root, struct inode *inode, u64 start,
               u64 end, int drop_cache);
int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
                  struct inode *inode, u64 start, u64 end);
int btrfs_release_file(struct inode *inode, struct file *file);
void btrfs_drop_pages(struct page **pages, size_t num_pages);
int btrfs_dirty_pages(struct btrfs_root *root, struct inode *inode,
              struct page **pages, size_t num_pages,
              loff_t pos, size_t write_bytes,
              struct extent_state **cached);

/* tree-defrag.c */
int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
            struct btrfs_root *root, int cache_only);

/* sysfs.c */
int btrfs_init_sysfs(void);
void btrfs_exit_sysfs(void);

/* xattr.c */
ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);

/* super.c */
int btrfs_parse_options(struct btrfs_root *root, char *options);
int btrfs_sync_fs(struct super_block *sb, int wait);

#ifdef CONFIG_PRINTK
__printf(2, 3)
void btrfs_printk(struct btrfs_fs_info *fs_info, const char *fmt, ...);
#else
static inline __printf(2, 3)
void btrfs_printk(struct btrfs_fs_info *fs_info, const char *fmt, ...)
{
}
#endif

__printf(5, 6)
void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function,
             unsigned int line, int errno, const char *fmt, ...);


void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
                   struct btrfs_root *root, const char *function,
                   unsigned int line, int errno);

#define btrfs_set_fs_incompat(__fs_info, opt) \
    __btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt)

static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info,
                       u64 flag)
{
    struct btrfs_super_block *disk_super;
    u64 features;

    disk_super = fs_info->super_copy;
    features = btrfs_super_incompat_flags(disk_super);
    if (!(features & flag)) {
        features |= flag;
        btrfs_set_super_incompat_flags(disk_super, features);
    }
}

/*
 * Call btrfs_abort_transaction as early as possible when an error condition is
 * detected, that way the exact line number is reported.
 */

#define btrfs_abort_transaction(trans, root, errno)     \
do {                                \
    __btrfs_abort_transaction(trans, root, __func__,    \
                  __LINE__, errno);     \
} while (0)

#define btrfs_std_error(fs_info, errno)             \
do {                                \
    if ((errno))                        \
        __btrfs_std_error((fs_info), __func__,      \
                   __LINE__, (errno), NULL);    \
} while (0)

#define btrfs_error(fs_info, errno, fmt, args...)       \
do {                                \
    __btrfs_std_error((fs_info), __func__, __LINE__,    \
              (errno), fmt, ##args);        \
} while (0)

__printf(5, 6)
void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
           unsigned int line, int errno, const char *fmt, ...);

#define btrfs_panic(fs_info, errno, fmt, args...)           \
do {                                    \
    struct btrfs_fs_info *_i = (fs_info);               \
    __btrfs_panic(_i, __func__, __LINE__, errno, fmt, ##args);  \
    BUG_ON(!(_i->mount_opt & BTRFS_MOUNT_PANIC_ON_FATAL_ERROR));    \
} while (0)

/* acl.c */
#ifdef CONFIG_BTRFS_FS_POSIX_ACL
struct posix_acl *btrfs_get_acl(struct inode *inode, int type);
int btrfs_init_acl(struct btrfs_trans_handle *trans,
           struct inode *inode, struct inode *dir);
int btrfs_acl_chmod(struct inode *inode);
#else
#define btrfs_get_acl NULL
static inline int btrfs_init_acl(struct btrfs_trans_handle *trans,
                 struct inode *inode, struct inode *dir)
{
    return 0;
}
static inline int btrfs_acl_chmod(struct inode *inode)
{
    return 0;
}
#endif

/* relocation.c */
int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start);
int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
              struct btrfs_root *root);
int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
                struct btrfs_root *root);
int btrfs_recover_relocation(struct btrfs_root *root);
int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len);
void btrfs_reloc_cow_block(struct btrfs_trans_handle *trans,
               struct btrfs_root *root, struct extent_buffer *buf,
               struct extent_buffer *cow);
void btrfs_reloc_pre_snapshot(struct btrfs_trans_handle *trans,
                  struct btrfs_pending_snapshot *pending,
                  u64 *bytes_to_reserve);
int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans,
                  struct btrfs_pending_snapshot *pending);

/* scrub.c */
int btrfs_scrub_dev(struct btrfs_root *root, u64 devid, u64 start, u64 end,
            struct btrfs_scrub_progress *progress, int readonly);
void btrfs_scrub_pause(struct btrfs_root *root);
void btrfs_scrub_pause_super(struct btrfs_root *root);
void btrfs_scrub_continue(struct btrfs_root *root);
void btrfs_scrub_continue_super(struct btrfs_root *root);
int __btrfs_scrub_cancel(struct btrfs_fs_info *info);
int btrfs_scrub_cancel(struct btrfs_root *root);
int btrfs_scrub_cancel_dev(struct btrfs_root *root, struct btrfs_device *dev);
int btrfs_scrub_cancel_devid(struct btrfs_root *root, u64 devid);
int btrfs_scrub_progress(struct btrfs_root *root, u64 devid,
             struct btrfs_scrub_progress *progress);

/* reada.c */
struct reada_control {
    struct btrfs_root   *root;      /* tree to prefetch */
    struct btrfs_key    key_start;
    struct btrfs_key    key_end;    /* exclusive */
    atomic_t        elems;
    struct kref     refcnt;
    wait_queue_head_t   wait;
};
struct reada_control *btrfs_reada_add(struct btrfs_root *root,
                  struct btrfs_key *start, struct btrfs_key *end);
int btrfs_reada_wait(void *handle);
void btrfs_reada_detach(void *handle);
int btree_readahead_hook(struct btrfs_root *root, struct extent_buffer *eb,
             u64 start, int err);

/* qgroup.c */
struct qgroup_update {
    struct list_head list;
    struct btrfs_delayed_ref_node *node;
    struct btrfs_delayed_extent_op *extent_op;
};

int btrfs_quota_enable(struct btrfs_trans_handle *trans,
               struct btrfs_fs_info *fs_info);
int btrfs_quota_disable(struct btrfs_trans_handle *trans,
            struct btrfs_fs_info *fs_info);
int btrfs_quota_rescan(struct btrfs_fs_info *fs_info);
int btrfs_add_qgroup_relation(struct btrfs_trans_handle *trans,
                  struct btrfs_fs_info *fs_info, u64 src, u64 dst);
int btrfs_del_qgroup_relation(struct btrfs_trans_handle *trans,
                  struct btrfs_fs_info *fs_info, u64 src, u64 dst);
int btrfs_create_qgroup(struct btrfs_trans_handle *trans,
            struct btrfs_fs_info *fs_info, u64 qgroupid,
            char *name);
int btrfs_remove_qgroup(struct btrfs_trans_handle *trans,
                  struct btrfs_fs_info *fs_info, u64 qgroupid);
int btrfs_limit_qgroup(struct btrfs_trans_handle *trans,
               struct btrfs_fs_info *fs_info, u64 qgroupid,
               struct btrfs_qgroup_limit *limit);
int btrfs_read_qgroup_config(struct btrfs_fs_info *fs_info);
void btrfs_free_qgroup_config(struct btrfs_fs_info *fs_info);
struct btrfs_delayed_extent_op;
int btrfs_qgroup_record_ref(struct btrfs_trans_handle *trans,
                struct btrfs_delayed_ref_node *node,
                struct btrfs_delayed_extent_op *extent_op);
int btrfs_qgroup_account_ref(struct btrfs_trans_handle *trans,
                 struct btrfs_fs_info *fs_info,
                 struct btrfs_delayed_ref_node *node,
                 struct btrfs_delayed_extent_op *extent_op);
int btrfs_run_qgroups(struct btrfs_trans_handle *trans,
              struct btrfs_fs_info *fs_info);
int btrfs_qgroup_inherit(struct btrfs_trans_handle *trans,
             struct btrfs_fs_info *fs_info, u64 srcid, u64 objectid,
             struct btrfs_qgroup_inherit *inherit);
int btrfs_qgroup_reserve(struct btrfs_root *root, u64 num_bytes);
void btrfs_qgroup_free(struct btrfs_root *root, u64 num_bytes);

void assert_qgroups_uptodate(struct btrfs_trans_handle *trans);

static inline int is_fstree(u64 rootid)
{
    if (rootid == BTRFS_FS_TREE_OBJECTID ||
        (s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID)
        return 1;
    return 0;
}
#endif