uboot/fs/btrfs/ctree.h
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   1/* SPDX-License-Identifier: GPL-2.0+ */
   2/*
   3 * From linux/fs/btrfs/ctree.h
   4 *   Copyright (C) 2007,2008 Oracle.  All rights reserved.
   5 *
   6 * Modified in 2017 by Marek Behun, CZ.NIC, marek.behun@nic.cz
   7 */
   8
   9#ifndef __BTRFS_CTREE_H__
  10#define __BTRFS_CTREE_H__
  11
  12#include <common.h>
  13#include <compiler.h>
  14#include <linux/rbtree.h>
  15#include <linux/bug.h>
  16#include <linux/unaligned/le_byteshift.h>
  17#include <u-boot/crc.h>
  18#include "kernel-shared/btrfs_tree.h"
  19#include "crypto/hash.h"
  20#include "compat.h"
  21#include "extent-io.h"
  22
  23#define BTRFS_MAX_MIRRORS 3
  24
  25/*
  26 * the max metadata block size.  This limit is somewhat artificial,
  27 * but the memmove costs go through the roof for larger blocks.
  28 */
  29#define BTRFS_MAX_METADATA_BLOCKSIZE 65536
  30
  31/*
  32 * Theoretical limit is larger, but we keep this down to a sane
  33 * value. That should limit greatly the possibility of collisions on
  34 * inode ref items.
  35 */
  36#define BTRFS_LINK_MAX 65535U
  37
  38/* four bytes for CRC32 */
  39#define BTRFS_EMPTY_DIR_SIZE 0
  40
  41struct btrfs_mapping_tree {
  42        struct cache_tree cache_tree;
  43};
  44
  45static inline unsigned long btrfs_chunk_item_size(int num_stripes)
  46{
  47        BUG_ON(num_stripes == 0);
  48        return sizeof(struct btrfs_chunk) +
  49                sizeof(struct btrfs_stripe) * (num_stripes - 1);
  50}
  51
  52#define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
  53#define BTRFS_LEAF_DATA_SIZE(fs_info) \
  54                                (__BTRFS_LEAF_DATA_SIZE(fs_info->nodesize))
  55
  56struct btrfs_path {
  57        struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
  58        int slots[BTRFS_MAX_LEVEL];
  59
  60        /* keep some upper locks as we walk down */
  61        u8 lowest_level;
  62};
  63
  64/* ioprio of readahead is set to idle */
  65#define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0))
  66
  67#define BTRFS_DIRTY_METADATA_THRESH     SZ_32M
  68
  69#define BTRFS_MAX_EXTENT_SIZE SZ_128M
  70
  71enum btrfs_tree_block_status {
  72        BTRFS_TREE_BLOCK_CLEAN,
  73        BTRFS_TREE_BLOCK_INVALID_NRITEMS,
  74        BTRFS_TREE_BLOCK_INVALID_PARENT_KEY,
  75        BTRFS_TREE_BLOCK_BAD_KEY_ORDER,
  76        BTRFS_TREE_BLOCK_INVALID_LEVEL,
  77        BTRFS_TREE_BLOCK_INVALID_FREE_SPACE,
  78        BTRFS_TREE_BLOCK_INVALID_OFFSETS,
  79};
  80
  81struct btrfs_root {
  82        struct extent_buffer *node;
  83        struct btrfs_root_item root_item;
  84        struct btrfs_key root_key;
  85        struct btrfs_fs_info *fs_info;
  86        u64 objectid;
  87        u64 last_trans;
  88
  89        int ref_cows;
  90        int track_dirty;
  91
  92        u32 type;
  93        u64 last_inode_alloc;
  94
  95        struct rb_node rb_node;
  96};
  97
  98struct btrfs_trans_handle;
  99struct btrfs_device;
 100struct btrfs_fs_devices;
 101struct btrfs_fs_info {
 102        u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
 103        u8 *new_chunk_tree_uuid;
 104        struct btrfs_root *fs_root;
 105        struct btrfs_root *tree_root;
 106        struct btrfs_root *chunk_root;
 107        struct btrfs_root *csum_root;
 108
 109        struct rb_root fs_root_tree;
 110
 111        struct extent_io_tree extent_cache;
 112
 113        /* logical->physical extent mapping */
 114        struct btrfs_mapping_tree mapping_tree;
 115
 116        u64 last_trans_committed;
 117
 118        struct btrfs_super_block *super_copy;
 119
 120        struct btrfs_fs_devices *fs_devices;
 121
 122        /* Cached block sizes */
 123        u32 nodesize;
 124        u32 sectorsize;
 125        u32 stripesize;
 126};
 127
 128static inline u32 BTRFS_MAX_ITEM_SIZE(const struct btrfs_fs_info *info)
 129{
 130        return BTRFS_LEAF_DATA_SIZE(info) - sizeof(struct btrfs_item);
 131}
 132
 133static inline u32 BTRFS_NODEPTRS_PER_BLOCK(const struct btrfs_fs_info *info)
 134{
 135        return BTRFS_LEAF_DATA_SIZE(info) / sizeof(struct btrfs_key_ptr);
 136}
 137
 138static inline u32 BTRFS_NODEPTRS_PER_EXTENT_BUFFER(const struct extent_buffer *eb)
 139{
 140        BUG_ON(eb->fs_info && eb->fs_info->nodesize != eb->len);
 141        return __BTRFS_LEAF_DATA_SIZE(eb->len) / sizeof(struct btrfs_key_ptr);
 142}
 143
 144#define BTRFS_FILE_EXTENT_INLINE_DATA_START             \
 145        (offsetof(struct btrfs_file_extent_item, disk_bytenr))
 146static inline u32 BTRFS_MAX_INLINE_DATA_SIZE(const struct btrfs_fs_info *info)
 147{
 148        return BTRFS_MAX_ITEM_SIZE(info) -
 149                BTRFS_FILE_EXTENT_INLINE_DATA_START;
 150}
 151
 152static inline u32 BTRFS_MAX_XATTR_SIZE(const struct btrfs_fs_info *info)
 153{
 154        return BTRFS_MAX_ITEM_SIZE(info) - sizeof(struct btrfs_dir_item);
 155}
 156
 157/*
 158 * File system states
 159 */
 160#define BTRFS_FS_STATE_ERROR            0
 161#define BTRFS_FS_STATE_REMOUNTING       1
 162#define BTRFS_FS_STATE_TRANS_ABORTED    2
 163#define BTRFS_FS_STATE_DEV_REPLACING    3
 164#define BTRFS_FS_STATE_DUMMY_FS_INFO    4
 165
 166#define read_eb_member(eb, ptr, type, member, result) (                 \
 167        read_extent_buffer(eb, (char *)(result),                        \
 168                           ((unsigned long)(ptr)) +                     \
 169                            offsetof(type, member),                     \
 170                           sizeof(((type *)0)->member)))
 171
 172#define write_eb_member(eb, ptr, type, member, result) (                \
 173        write_extent_buffer(eb, (char *)(result),                       \
 174                           ((unsigned long)(ptr)) +                     \
 175                            offsetof(type, member),                     \
 176                           sizeof(((type *)0)->member)))
 177
 178#define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits)             \
 179static inline u##bits btrfs_##name(const struct extent_buffer *eb)      \
 180{                                                                       \
 181        const struct btrfs_header *h = (struct btrfs_header *)eb->data; \
 182        return le##bits##_to_cpu(h->member);                            \
 183}                                                                       \
 184static inline void btrfs_set_##name(struct extent_buffer *eb,           \
 185                                    u##bits val)                        \
 186{                                                                       \
 187        struct btrfs_header *h = (struct btrfs_header *)eb->data;       \
 188        h->member = cpu_to_le##bits(val);                               \
 189}
 190
 191#define BTRFS_SETGET_FUNCS(name, type, member, bits)                    \
 192static inline u##bits btrfs_##name(const struct extent_buffer *eb,      \
 193                                   const type *s)                       \
 194{                                                                       \
 195        unsigned long offset = (unsigned long)s;                        \
 196        const type *p = (type *) (eb->data + offset);                   \
 197        return get_unaligned_le##bits(&p->member);                      \
 198}                                                                       \
 199static inline void btrfs_set_##name(struct extent_buffer *eb,           \
 200                                    type *s, u##bits val)               \
 201{                                                                       \
 202        unsigned long offset = (unsigned long)s;                        \
 203        type *p = (type *) (eb->data + offset);                         \
 204        put_unaligned_le##bits(val, &p->member);                        \
 205}
 206
 207#define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits)              \
 208static inline u##bits btrfs_##name(const type *s)                       \
 209{                                                                       \
 210        return le##bits##_to_cpu(s->member);                            \
 211}                                                                       \
 212static inline void btrfs_set_##name(type *s, u##bits val)               \
 213{                                                                       \
 214        s->member = cpu_to_le##bits(val);                               \
 215}
 216
 217BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
 218BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
 219BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
 220BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
 221BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
 222BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
 223                   start_offset, 64);
 224BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
 225BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
 226BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
 227BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
 228BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
 229BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
 230
 231BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
 232BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
 233                         total_bytes, 64);
 234BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
 235                         bytes_used, 64);
 236BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
 237                         io_align, 32);
 238BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
 239                         io_width, 32);
 240BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
 241                         sector_size, 32);
 242BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
 243BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
 244                         dev_group, 32);
 245BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
 246                         seek_speed, 8);
 247BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
 248                         bandwidth, 8);
 249BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
 250                         generation, 64);
 251
 252static inline char *btrfs_device_uuid(struct btrfs_dev_item *d)
 253{
 254        return (char *)d + offsetof(struct btrfs_dev_item, uuid);
 255}
 256
 257static inline char *btrfs_device_fsid(struct btrfs_dev_item *d)
 258{
 259        return (char *)d + offsetof(struct btrfs_dev_item, fsid);
 260}
 261
 262BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
 263BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
 264BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
 265BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
 266BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
 267BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
 268BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
 269BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
 270BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
 271BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
 272BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
 273
 274static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
 275{
 276        return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
 277}
 278
 279BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
 280BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
 281BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
 282                         stripe_len, 64);
 283BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
 284                         io_align, 32);
 285BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
 286                         io_width, 32);
 287BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
 288                         sector_size, 32);
 289BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
 290BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
 291                         num_stripes, 16);
 292BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
 293                         sub_stripes, 16);
 294BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
 295BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
 296
 297static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
 298                                                   int nr)
 299{
 300        unsigned long offset = (unsigned long)c;
 301        offset += offsetof(struct btrfs_chunk, stripe);
 302        offset += nr * sizeof(struct btrfs_stripe);
 303        return (struct btrfs_stripe *)offset;
 304}
 305
 306static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
 307{
 308        return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
 309}
 310
 311static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
 312                                         struct btrfs_chunk *c, int nr)
 313{
 314        return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
 315}
 316
 317static inline void btrfs_set_stripe_offset_nr(struct extent_buffer *eb,
 318                                             struct btrfs_chunk *c, int nr,
 319                                             u64 val)
 320{
 321        btrfs_set_stripe_offset(eb, btrfs_stripe_nr(c, nr), val);
 322}
 323
 324static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
 325                                         struct btrfs_chunk *c, int nr)
 326{
 327        return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
 328}
 329
 330static inline void btrfs_set_stripe_devid_nr(struct extent_buffer *eb,
 331                                             struct btrfs_chunk *c, int nr,
 332                                             u64 val)
 333{
 334        btrfs_set_stripe_devid(eb, btrfs_stripe_nr(c, nr), val);
 335}
 336
 337/* struct btrfs_block_group_item */
 338BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
 339                         used, 64);
 340BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
 341                         used, 64);
 342BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
 343                        struct btrfs_block_group_item, chunk_objectid, 64);
 344
 345BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
 346                   struct btrfs_block_group_item, chunk_objectid, 64);
 347BTRFS_SETGET_FUNCS(disk_block_group_flags,
 348                   struct btrfs_block_group_item, flags, 64);
 349BTRFS_SETGET_STACK_FUNCS(block_group_flags,
 350                        struct btrfs_block_group_item, flags, 64);
 351
 352/* struct btrfs_free_space_info */
 353BTRFS_SETGET_FUNCS(free_space_extent_count, struct btrfs_free_space_info,
 354                   extent_count, 32);
 355BTRFS_SETGET_FUNCS(free_space_flags, struct btrfs_free_space_info, flags, 32);
 356
 357/* struct btrfs_inode_ref */
 358BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
 359BTRFS_SETGET_STACK_FUNCS(stack_inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
 360BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
 361
 362/* struct btrfs_inode_extref */
 363BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
 364                   parent_objectid, 64);
 365BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
 366                   name_len, 16);
 367BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64);
 368
 369/* struct btrfs_inode_item */
 370BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
 371BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
 372BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
 373BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
 374BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
 375BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
 376BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
 377BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
 378BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
 379BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
 380BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
 381BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
 382
 383BTRFS_SETGET_STACK_FUNCS(stack_inode_generation,
 384                         struct btrfs_inode_item, generation, 64);
 385BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence,
 386                         struct btrfs_inode_item, sequence, 64);
 387BTRFS_SETGET_STACK_FUNCS(stack_inode_transid,
 388                         struct btrfs_inode_item, transid, 64);
 389BTRFS_SETGET_STACK_FUNCS(stack_inode_size,
 390                         struct btrfs_inode_item, size, 64);
 391BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes,
 392                         struct btrfs_inode_item, nbytes, 64);
 393BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group,
 394                         struct btrfs_inode_item, block_group, 64);
 395BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink,
 396                         struct btrfs_inode_item, nlink, 32);
 397BTRFS_SETGET_STACK_FUNCS(stack_inode_uid,
 398                         struct btrfs_inode_item, uid, 32);
 399BTRFS_SETGET_STACK_FUNCS(stack_inode_gid,
 400                         struct btrfs_inode_item, gid, 32);
 401BTRFS_SETGET_STACK_FUNCS(stack_inode_mode,
 402                         struct btrfs_inode_item, mode, 32);
 403BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev,
 404                         struct btrfs_inode_item, rdev, 64);
 405BTRFS_SETGET_STACK_FUNCS(stack_inode_flags,
 406                         struct btrfs_inode_item, flags, 64);
 407
 408static inline struct btrfs_timespec *
 409btrfs_inode_atime(struct btrfs_inode_item *inode_item)
 410{
 411        unsigned long ptr = (unsigned long)inode_item;
 412        ptr += offsetof(struct btrfs_inode_item, atime);
 413        return (struct btrfs_timespec *)ptr;
 414}
 415
 416static inline struct btrfs_timespec *
 417btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
 418{
 419        unsigned long ptr = (unsigned long)inode_item;
 420        ptr += offsetof(struct btrfs_inode_item, mtime);
 421        return (struct btrfs_timespec *)ptr;
 422}
 423
 424static inline struct btrfs_timespec *
 425btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
 426{
 427        unsigned long ptr = (unsigned long)inode_item;
 428        ptr += offsetof(struct btrfs_inode_item, ctime);
 429        return (struct btrfs_timespec *)ptr;
 430}
 431
 432static inline struct btrfs_timespec *
 433btrfs_inode_otime(struct btrfs_inode_item *inode_item)
 434{
 435        unsigned long ptr = (unsigned long)inode_item;
 436        ptr += offsetof(struct btrfs_inode_item, otime);
 437        return (struct btrfs_timespec *)ptr;
 438}
 439
 440BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
 441BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
 442BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec,
 443                         sec, 64);
 444BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec,
 445                         nsec, 32);
 446
 447/* struct btrfs_dev_extent */
 448BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
 449                   chunk_tree, 64);
 450BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
 451                   chunk_objectid, 64);
 452BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
 453                   chunk_offset, 64);
 454BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
 455
 456BTRFS_SETGET_STACK_FUNCS(stack_dev_extent_length, struct btrfs_dev_extent,
 457                         length, 64);
 458
 459static inline u8 *btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
 460{
 461        unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
 462        return (u8 *)((unsigned long)dev + ptr);
 463}
 464
 465
 466/* struct btrfs_extent_item */
 467BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
 468BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item, refs, 64);
 469BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
 470                   generation, 64);
 471BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
 472BTRFS_SETGET_STACK_FUNCS(stack_extent_flags, struct btrfs_extent_item, flags, 64);
 473
 474BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
 475
 476BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
 477
 478static inline void btrfs_tree_block_key(struct extent_buffer *eb,
 479                                        struct btrfs_tree_block_info *item,
 480                                        struct btrfs_disk_key *key)
 481{
 482        read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
 483}
 484
 485static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
 486                                            struct btrfs_tree_block_info *item,
 487                                            struct btrfs_disk_key *key)
 488{
 489        write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
 490}
 491
 492BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
 493                   root, 64);
 494BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
 495                   objectid, 64);
 496BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
 497                   offset, 64);
 498BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
 499                   count, 32);
 500
 501BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
 502                   count, 32);
 503
 504BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
 505                   type, 8);
 506BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
 507                   offset, 64);
 508BTRFS_SETGET_STACK_FUNCS(stack_extent_inline_ref_type,
 509                         struct btrfs_extent_inline_ref, type, 8);
 510BTRFS_SETGET_STACK_FUNCS(stack_extent_inline_ref_offset,
 511                         struct btrfs_extent_inline_ref, offset, 64);
 512
 513static inline u32 btrfs_extent_inline_ref_size(int type)
 514{
 515        if (type == BTRFS_TREE_BLOCK_REF_KEY ||
 516            type == BTRFS_SHARED_BLOCK_REF_KEY)
 517                return sizeof(struct btrfs_extent_inline_ref);
 518        if (type == BTRFS_SHARED_DATA_REF_KEY)
 519                return sizeof(struct btrfs_shared_data_ref) +
 520                       sizeof(struct btrfs_extent_inline_ref);
 521        if (type == BTRFS_EXTENT_DATA_REF_KEY)
 522                return sizeof(struct btrfs_extent_data_ref) +
 523                       offsetof(struct btrfs_extent_inline_ref, offset);
 524        BUG();
 525        return 0;
 526}
 527
 528BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
 529BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
 530                   generation, 64);
 531BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
 532BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
 533
 534/* struct btrfs_node */
 535BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
 536BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
 537
 538static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
 539{
 540        unsigned long ptr;
 541        ptr = offsetof(struct btrfs_node, ptrs) +
 542                sizeof(struct btrfs_key_ptr) * nr;
 543        return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
 544}
 545
 546static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
 547                                           int nr, u64 val)
 548{
 549        unsigned long ptr;
 550        ptr = offsetof(struct btrfs_node, ptrs) +
 551                sizeof(struct btrfs_key_ptr) * nr;
 552        btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
 553}
 554
 555static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
 556{
 557        unsigned long ptr;
 558        ptr = offsetof(struct btrfs_node, ptrs) +
 559                sizeof(struct btrfs_key_ptr) * nr;
 560        return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
 561}
 562
 563static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
 564                                                 int nr, u64 val)
 565{
 566        unsigned long ptr;
 567        ptr = offsetof(struct btrfs_node, ptrs) +
 568                sizeof(struct btrfs_key_ptr) * nr;
 569        btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
 570}
 571
 572static inline unsigned long btrfs_node_key_ptr_offset(int nr)
 573{
 574        return offsetof(struct btrfs_node, ptrs) +
 575                sizeof(struct btrfs_key_ptr) * nr;
 576}
 577
 578static inline void btrfs_node_key(struct extent_buffer *eb,
 579                                  struct btrfs_disk_key *disk_key, int nr)
 580{
 581        unsigned long ptr;
 582        ptr = btrfs_node_key_ptr_offset(nr);
 583        read_eb_member(eb, (struct btrfs_key_ptr *)ptr,
 584                       struct btrfs_key_ptr, key, disk_key);
 585}
 586
 587static inline void btrfs_set_node_key(struct extent_buffer *eb,
 588                                      struct btrfs_disk_key *disk_key, int nr)
 589{
 590        unsigned long ptr;
 591        ptr = btrfs_node_key_ptr_offset(nr);
 592        write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
 593                       struct btrfs_key_ptr, key, disk_key);
 594}
 595
 596/* struct btrfs_item */
 597BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
 598BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
 599
 600static inline unsigned long btrfs_item_nr_offset(int nr)
 601{
 602        return offsetof(struct btrfs_leaf, items) +
 603                sizeof(struct btrfs_item) * nr;
 604}
 605
 606static inline struct btrfs_item *btrfs_item_nr(int nr)
 607{
 608        return (struct btrfs_item *)btrfs_item_nr_offset(nr);
 609}
 610
 611static inline u32 btrfs_item_end(struct extent_buffer *eb,
 612                                 struct btrfs_item *item)
 613{
 614        return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
 615}
 616
 617static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
 618{
 619        return btrfs_item_end(eb, btrfs_item_nr(nr));
 620}
 621
 622static inline u32 btrfs_item_offset_nr(const struct extent_buffer *eb, int nr)
 623{
 624        return btrfs_item_offset(eb, btrfs_item_nr(nr));
 625}
 626
 627static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
 628{
 629        return btrfs_item_size(eb, btrfs_item_nr(nr));
 630}
 631
 632static inline void btrfs_item_key(struct extent_buffer *eb,
 633                           struct btrfs_disk_key *disk_key, int nr)
 634{
 635        struct btrfs_item *item = btrfs_item_nr(nr);
 636        read_eb_member(eb, item, struct btrfs_item, key, disk_key);
 637}
 638
 639static inline void btrfs_set_item_key(struct extent_buffer *eb,
 640                               struct btrfs_disk_key *disk_key, int nr)
 641{
 642        struct btrfs_item *item = btrfs_item_nr(nr);
 643        write_eb_member(eb, item, struct btrfs_item, key, disk_key);
 644}
 645
 646BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
 647
 648/*
 649 * struct btrfs_root_ref
 650 */
 651BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
 652BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
 653BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
 654
 655BTRFS_SETGET_STACK_FUNCS(stack_root_ref_dirid, struct btrfs_root_ref, dirid, 64);
 656BTRFS_SETGET_STACK_FUNCS(stack_root_ref_sequence, struct btrfs_root_ref, sequence, 64);
 657BTRFS_SETGET_STACK_FUNCS(stack_root_ref_name_len, struct btrfs_root_ref, name_len, 16);
 658
 659/* struct btrfs_dir_item */
 660BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
 661BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
 662BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
 663BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
 664
 665BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item, data_len, 16);
 666BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8);
 667BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item, name_len, 16);
 668BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item, transid, 64);
 669
 670static inline void btrfs_dir_item_key(struct extent_buffer *eb,
 671                                      struct btrfs_dir_item *item,
 672                                      struct btrfs_disk_key *key)
 673{
 674        read_eb_member(eb, item, struct btrfs_dir_item, location, key);
 675}
 676
 677static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
 678                                          struct btrfs_dir_item *item,
 679                                          struct btrfs_disk_key *key)
 680{
 681        write_eb_member(eb, item, struct btrfs_dir_item, location, key);
 682}
 683
 684/* struct btrfs_free_space_header */
 685BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
 686                   num_entries, 64);
 687BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
 688                   num_bitmaps, 64);
 689BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
 690                   generation, 64);
 691
 692static inline void btrfs_free_space_key(struct extent_buffer *eb,
 693                                        struct btrfs_free_space_header *h,
 694                                        struct btrfs_disk_key *key)
 695{
 696        read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
 697}
 698
 699static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
 700                                            struct btrfs_free_space_header *h,
 701                                            struct btrfs_disk_key *key)
 702{
 703        write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
 704}
 705
 706/* struct btrfs_disk_key */
 707BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
 708                         objectid, 64);
 709BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
 710BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
 711
 712static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
 713                                         struct btrfs_disk_key *disk)
 714{
 715        cpu->offset = le64_to_cpu(disk->offset);
 716        cpu->type = disk->type;
 717        cpu->objectid = le64_to_cpu(disk->objectid);
 718}
 719
 720static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
 721                                         const struct btrfs_key *cpu)
 722{
 723        disk->offset = cpu_to_le64(cpu->offset);
 724        disk->type = cpu->type;
 725        disk->objectid = cpu_to_le64(cpu->objectid);
 726}
 727
 728static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
 729                                  struct btrfs_key *key, int nr)
 730{
 731        struct btrfs_disk_key disk_key;
 732        btrfs_node_key(eb, &disk_key, nr);
 733        btrfs_disk_key_to_cpu(key, &disk_key);
 734}
 735
 736static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
 737                                  struct btrfs_key *key, int nr)
 738{
 739        struct btrfs_disk_key disk_key;
 740        btrfs_item_key(eb, &disk_key, nr);
 741        btrfs_disk_key_to_cpu(key, &disk_key);
 742}
 743
 744static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
 745                                      struct btrfs_dir_item *item,
 746                                      struct btrfs_key *key)
 747{
 748        struct btrfs_disk_key disk_key;
 749        btrfs_dir_item_key(eb, item, &disk_key);
 750        btrfs_disk_key_to_cpu(key, &disk_key);
 751}
 752
 753/* struct btrfs_header */
 754BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
 755BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
 756                          generation, 64);
 757BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
 758BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
 759BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
 760BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
 761BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64);
 762BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header, nritems,
 763                         32);
 764BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64);
 765BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header,
 766                         generation, 64);
 767
 768static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
 769{
 770        return (btrfs_header_flags(eb) & flag) == flag;
 771}
 772
 773static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
 774{
 775        u64 flags = btrfs_header_flags(eb);
 776        btrfs_set_header_flags(eb, flags | flag);
 777        return (flags & flag) == flag;
 778}
 779
 780static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
 781{
 782        u64 flags = btrfs_header_flags(eb);
 783        btrfs_set_header_flags(eb, flags & ~flag);
 784        return (flags & flag) == flag;
 785}
 786
 787static inline int btrfs_header_backref_rev(struct extent_buffer *eb)
 788{
 789        u64 flags = btrfs_header_flags(eb);
 790        return flags >> BTRFS_BACKREF_REV_SHIFT;
 791}
 792
 793static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
 794                                                int rev)
 795{
 796        u64 flags = btrfs_header_flags(eb);
 797        flags &= ~BTRFS_BACKREF_REV_MASK;
 798        flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
 799        btrfs_set_header_flags(eb, flags);
 800}
 801
 802static inline unsigned long btrfs_header_fsid(void)
 803{
 804        return offsetof(struct btrfs_header, fsid);
 805}
 806
 807static inline unsigned long btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
 808{
 809        return offsetof(struct btrfs_header, chunk_tree_uuid);
 810}
 811
 812static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
 813{
 814        unsigned long ptr = offsetof(struct btrfs_header, csum);
 815        return (u8 *)ptr;
 816}
 817
 818static inline int btrfs_is_leaf(struct extent_buffer *eb)
 819{
 820        return (btrfs_header_level(eb) == 0);
 821}
 822
 823/* struct btrfs_root_item */
 824BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
 825                   generation, 64);
 826BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
 827BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
 828BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
 829
 830BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
 831                         generation, 64);
 832BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
 833BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
 834BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
 835BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
 836BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
 837BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
 838BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
 839BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
 840                         last_snapshot, 64);
 841BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
 842                         generation_v2, 64);
 843BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
 844                         ctransid, 64);
 845BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
 846                         otransid, 64);
 847BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
 848                         stransid, 64);
 849BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
 850                         rtransid, 64);
 851
 852static inline struct btrfs_timespec* btrfs_root_ctime(
 853                struct btrfs_root_item *root_item)
 854{
 855        unsigned long ptr = (unsigned long)root_item;
 856        ptr += offsetof(struct btrfs_root_item, ctime);
 857        return (struct btrfs_timespec *)ptr;
 858}
 859
 860static inline struct btrfs_timespec* btrfs_root_otime(
 861                struct btrfs_root_item *root_item)
 862{
 863        unsigned long ptr = (unsigned long)root_item;
 864        ptr += offsetof(struct btrfs_root_item, otime);
 865        return (struct btrfs_timespec *)ptr;
 866}
 867
 868static inline struct btrfs_timespec* btrfs_root_stime(
 869                struct btrfs_root_item *root_item)
 870{
 871        unsigned long ptr = (unsigned long)root_item;
 872        ptr += offsetof(struct btrfs_root_item, stime);
 873        return (struct btrfs_timespec *)ptr;
 874}
 875
 876static inline struct btrfs_timespec* btrfs_root_rtime(
 877                struct btrfs_root_item *root_item)
 878{
 879        unsigned long ptr = (unsigned long)root_item;
 880        ptr += offsetof(struct btrfs_root_item, rtime);
 881        return (struct btrfs_timespec *)ptr;
 882}
 883
 884/* struct btrfs_root_backup */
 885BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
 886                   tree_root, 64);
 887BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
 888                   tree_root_gen, 64);
 889BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
 890                   tree_root_level, 8);
 891
 892BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
 893                   chunk_root, 64);
 894BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
 895                   chunk_root_gen, 64);
 896BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
 897                   chunk_root_level, 8);
 898
 899BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
 900                   extent_root, 64);
 901BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
 902                   extent_root_gen, 64);
 903BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
 904                   extent_root_level, 8);
 905
 906BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
 907                   fs_root, 64);
 908BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
 909                   fs_root_gen, 64);
 910BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
 911                   fs_root_level, 8);
 912
 913BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
 914                   dev_root, 64);
 915BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
 916                   dev_root_gen, 64);
 917BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
 918                   dev_root_level, 8);
 919
 920BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
 921                   csum_root, 64);
 922BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
 923                   csum_root_gen, 64);
 924BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
 925                   csum_root_level, 8);
 926BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
 927                   total_bytes, 64);
 928BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
 929                   bytes_used, 64);
 930BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
 931                   num_devices, 64);
 932
 933/* struct btrfs_super_block */
 934
 935BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
 936BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
 937BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
 938                         generation, 64);
 939BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
 940BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
 941                         struct btrfs_super_block, sys_chunk_array_size, 32);
 942BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
 943                         struct btrfs_super_block, chunk_root_generation, 64);
 944BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
 945                         root_level, 8);
 946BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
 947                         chunk_root, 64);
 948BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
 949                         chunk_root_level, 8);
 950BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
 951                         log_root, 64);
 952BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
 953                         log_root_transid, 64);
 954BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
 955                         log_root_level, 8);
 956BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
 957                         total_bytes, 64);
 958BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
 959                         bytes_used, 64);
 960BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
 961                         sectorsize, 32);
 962BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
 963                         nodesize, 32);
 964BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
 965                         stripesize, 32);
 966BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
 967                         root_dir_objectid, 64);
 968BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
 969                         num_devices, 64);
 970BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
 971                         compat_flags, 64);
 972BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
 973                         compat_ro_flags, 64);
 974BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
 975                         incompat_flags, 64);
 976BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
 977                         csum_type, 16);
 978BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
 979                         cache_generation, 64);
 980BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
 981                         uuid_tree_generation, 64);
 982BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
 983
 984static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
 985{
 986        return offsetof(struct btrfs_leaf, items);
 987}
 988
 989/* struct btrfs_file_extent_item */
 990BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
 991BTRFS_SETGET_STACK_FUNCS(stack_file_extent_type, struct btrfs_file_extent_item, type, 8);
 992
 993static inline unsigned long btrfs_file_extent_inline_start(struct
 994                                                   btrfs_file_extent_item *e)
 995{
 996        unsigned long offset = (unsigned long)e;
 997        offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
 998        return offset;
 999}
1000
1001static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
1002{
1003        return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
1004}
1005
1006BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
1007                   disk_bytenr, 64);
1008BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr, struct btrfs_file_extent_item,
1009                   disk_bytenr, 64);
1010BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
1011                   generation, 64);
1012BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation, struct btrfs_file_extent_item,
1013                   generation, 64);
1014BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
1015                   disk_num_bytes, 64);
1016BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
1017                  offset, 64);
1018BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset, struct btrfs_file_extent_item,
1019                  offset, 64);
1020BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
1021                   num_bytes, 64);
1022BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes, struct btrfs_file_extent_item,
1023                   num_bytes, 64);
1024BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
1025                   ram_bytes, 64);
1026BTRFS_SETGET_STACK_FUNCS(stack_file_extent_ram_bytes, struct btrfs_file_extent_item,
1027                   ram_bytes, 64);
1028BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
1029                   compression, 8);
1030BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression, struct btrfs_file_extent_item,
1031                   compression, 8);
1032BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
1033                   encryption, 8);
1034BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
1035                   other_encoding, 16);
1036
1037/* btrfs_qgroup_status_item */
1038BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
1039                   version, 64);
1040BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
1041                   generation, 64);
1042BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
1043                   flags, 64);
1044BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item,
1045                   rescan, 64);
1046
1047BTRFS_SETGET_STACK_FUNCS(stack_qgroup_status_version,
1048                         struct btrfs_qgroup_status_item, version, 64);
1049BTRFS_SETGET_STACK_FUNCS(stack_qgroup_status_generation,
1050                         struct btrfs_qgroup_status_item, generation, 64);
1051BTRFS_SETGET_STACK_FUNCS(stack_qgroup_status_flags,
1052                         struct btrfs_qgroup_status_item, flags, 64);
1053BTRFS_SETGET_STACK_FUNCS(stack_qgroup_status_rescan,
1054                         struct btrfs_qgroup_status_item, rescan, 64);
1055
1056/* btrfs_qgroup_info_item */
1057BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
1058                   generation, 64);
1059BTRFS_SETGET_FUNCS(qgroup_info_referenced, struct btrfs_qgroup_info_item,
1060                   rfer, 64);
1061BTRFS_SETGET_FUNCS(qgroup_info_referenced_compressed,
1062                   struct btrfs_qgroup_info_item, rfer_cmpr, 64);
1063BTRFS_SETGET_FUNCS(qgroup_info_exclusive, struct btrfs_qgroup_info_item,
1064                   excl, 64);
1065BTRFS_SETGET_FUNCS(qgroup_info_exclusive_compressed,
1066                   struct btrfs_qgroup_info_item, excl_cmpr, 64);
1067
1068BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
1069                         struct btrfs_qgroup_info_item, generation, 64);
1070BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_referenced,
1071                         struct btrfs_qgroup_info_item, rfer, 64);
1072BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_referenced_compressed,
1073                   struct btrfs_qgroup_info_item, rfer_cmpr, 64);
1074BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_exclusive,
1075                         struct btrfs_qgroup_info_item, excl, 64);
1076BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_exclusive_compressed,
1077                   struct btrfs_qgroup_info_item, excl_cmpr, 64);
1078
1079/* btrfs_qgroup_limit_item */
1080BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
1081                   flags, 64);
1082BTRFS_SETGET_FUNCS(qgroup_limit_max_referenced, struct btrfs_qgroup_limit_item,
1083                   max_rfer, 64);
1084BTRFS_SETGET_FUNCS(qgroup_limit_max_exclusive, struct btrfs_qgroup_limit_item,
1085                   max_excl, 64);
1086BTRFS_SETGET_FUNCS(qgroup_limit_rsv_referenced, struct btrfs_qgroup_limit_item,
1087                   rsv_rfer, 64);
1088BTRFS_SETGET_FUNCS(qgroup_limit_rsv_exclusive, struct btrfs_qgroup_limit_item,
1089                   rsv_excl, 64);
1090
1091BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_flags,
1092                         struct btrfs_qgroup_limit_item, flags, 64);
1093BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_max_referenced,
1094                         struct btrfs_qgroup_limit_item, max_rfer, 64);
1095BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_max_exclusive,
1096                         struct btrfs_qgroup_limit_item, max_excl, 64);
1097BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_rsv_referenced,
1098                         struct btrfs_qgroup_limit_item, rsv_rfer, 64);
1099BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_rsv_exclusive,
1100                         struct btrfs_qgroup_limit_item, rsv_excl, 64);
1101
1102/* btrfs_balance_item */
1103BTRFS_SETGET_FUNCS(balance_item_flags, struct btrfs_balance_item, flags, 64);
1104
1105static inline struct btrfs_disk_balance_args* btrfs_balance_item_data(
1106                struct extent_buffer *eb, struct btrfs_balance_item *bi)
1107{
1108        unsigned long offset = (unsigned long)bi;
1109        struct btrfs_balance_item *p;
1110        p = (struct btrfs_balance_item *)(eb->data + offset);
1111        return &p->data;
1112}
1113
1114static inline struct btrfs_disk_balance_args* btrfs_balance_item_meta(
1115                struct extent_buffer *eb, struct btrfs_balance_item *bi)
1116{
1117        unsigned long offset = (unsigned long)bi;
1118        struct btrfs_balance_item *p;
1119        p = (struct btrfs_balance_item *)(eb->data + offset);
1120        return &p->meta;
1121}
1122
1123static inline struct btrfs_disk_balance_args* btrfs_balance_item_sys(
1124                struct extent_buffer *eb, struct btrfs_balance_item *bi)
1125{
1126        unsigned long offset = (unsigned long)bi;
1127        struct btrfs_balance_item *p;
1128        p = (struct btrfs_balance_item *)(eb->data + offset);
1129        return &p->sys;
1130}
1131
1132static inline u64 btrfs_dev_stats_value(const struct extent_buffer *eb,
1133                                        const struct btrfs_dev_stats_item *ptr,
1134                                        int index)
1135{
1136        u64 val;
1137
1138        read_extent_buffer(eb, &val,
1139                           offsetof(struct btrfs_dev_stats_item, values) +
1140                            ((unsigned long)ptr) + (index * sizeof(u64)),
1141                           sizeof(val));
1142        return val;
1143}
1144
1145/*
1146 * this returns the number of bytes used by the item on disk, minus the
1147 * size of any extent headers.  If a file is compressed on disk, this is
1148 * the compressed size
1149 */
1150static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
1151                                                    struct btrfs_item *e)
1152{
1153        unsigned long offset;
1154        offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
1155        return btrfs_item_size(eb, e) - offset;
1156}
1157
1158#define btrfs_fs_incompat(fs_info, opt) \
1159        __btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
1160
1161static inline bool __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
1162{
1163        struct btrfs_super_block *disk_super;
1164        disk_super = fs_info->super_copy;
1165        return !!(btrfs_super_incompat_flags(disk_super) & flag);
1166}
1167
1168#define btrfs_fs_compat_ro(fs_info, opt) \
1169        __btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
1170
1171static inline int __btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag)
1172{
1173        struct btrfs_super_block *disk_super;
1174        disk_super = fs_info->super_copy;
1175        return !!(btrfs_super_compat_ro_flags(disk_super) & flag);
1176}
1177
1178/* helper function to cast into the data area of the leaf. */
1179#define btrfs_item_ptr(leaf, slot, type) \
1180        ((type *)(btrfs_leaf_data(leaf) + \
1181        btrfs_item_offset_nr(leaf, slot)))
1182
1183#define btrfs_item_ptr_offset(leaf, slot) \
1184        ((unsigned long)(btrfs_leaf_data(leaf) + \
1185        btrfs_item_offset_nr(leaf, slot)))
1186
1187static inline u64 btrfs_name_hash(const char *name, int len)
1188{
1189        return (u64)crc32c((u32)~1, (u8 *)name, len);
1190}
1191
1192/*
1193 * Figure the key offset of an extended inode ref
1194 */
1195static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name,
1196                                    int len)
1197{
1198        return crc32(parent_objectid, (u8 *)name, len);
1199}
1200
1201union btrfs_tree_node {
1202        struct btrfs_header header;
1203        struct btrfs_leaf leaf;
1204        struct btrfs_node node;
1205};
1206
1207#define btrfs_path_item_ptr(p,t)                \
1208        ((t *) btrfs_path_leaf_data((p)))
1209
1210u16 btrfs_super_csum_size(const struct btrfs_super_block *s);
1211const char *btrfs_super_csum_name(u16 csum_type);
1212u16 btrfs_csum_type_size(u16 csum_type);
1213size_t btrfs_super_num_csums(void);
1214
1215/* root-tree.c */
1216int btrfs_find_last_root(struct btrfs_root *root, u64 objectid,
1217                        struct btrfs_root_item *item, struct btrfs_key *key);
1218
1219/* dir-item.c */
1220struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1221                                             struct btrfs_root *root,
1222                                             struct btrfs_path *path, u64 dir,
1223                                             const char *name, int name_len,
1224                                             int mod);
1225typedef int (*btrfs_iter_dir_callback_t)(struct btrfs_root *root,
1226                                         struct extent_buffer *eb,
1227                                         struct btrfs_dir_item *di);
1228int btrfs_iter_dir(struct btrfs_root *root, u64 ino,
1229                   btrfs_iter_dir_callback_t callback);
1230/* inode.c */
1231int btrfs_lookup_path(struct btrfs_root *root, u64 ino, const char *filename,
1232                        struct btrfs_root **root_ret, u64 *ino_ret,
1233                        u8 *type_ret, int symlink_limit);
1234int btrfs_read_extent_inline(struct btrfs_path *path,
1235                             struct btrfs_file_extent_item *fi, char *dest);
1236int btrfs_read_extent_reg(struct btrfs_path *path,
1237                          struct btrfs_file_extent_item *fi, u64 offset,
1238                          int len, char *dest);
1239
1240/* ctree.c */
1241int btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2);
1242enum btrfs_tree_block_status
1243btrfs_check_node(struct btrfs_fs_info *fs_info,
1244                 struct btrfs_disk_key *parent_key, struct extent_buffer *buf);
1245enum btrfs_tree_block_status
1246btrfs_check_leaf(struct btrfs_fs_info *fs_info,
1247                 struct btrfs_disk_key *parent_key, struct extent_buffer *buf);
1248struct extent_buffer *read_node_slot(struct btrfs_fs_info *fs_info,
1249                                   struct extent_buffer *parent, int slot);
1250int btrfs_previous_item(struct btrfs_root *root,
1251                        struct btrfs_path *path, u64 min_objectid,
1252                        int type);
1253int btrfs_next_sibling_tree_block(struct btrfs_fs_info *fs_info,
1254                                  struct btrfs_path *path);
1255/*
1256 * Walk up the tree as far as necessary to find the next leaf.
1257 *
1258 * returns 0 if it found something or 1 if there are no greater leaves.
1259 * returns < 0 on io errors.
1260 */
1261static inline int btrfs_next_leaf(struct btrfs_root *root,
1262                                  struct btrfs_path *path)
1263{
1264        path->lowest_level = 0;
1265        return btrfs_next_sibling_tree_block(root->fs_info, path);
1266}
1267
1268static inline int btrfs_next_item(struct btrfs_root *root,
1269                                  struct btrfs_path *p)
1270{
1271        ++p->slots[0];
1272        if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
1273                return btrfs_next_leaf(root, p);
1274        return 0;
1275}
1276
1277int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
1278int btrfs_leaf_free_space(struct extent_buffer *leaf);
1279int btrfs_search_slot(struct btrfs_trans_handle *trans,
1280                struct btrfs_root *root, const struct btrfs_key *key,
1281                struct btrfs_path *p, int ins_len, int cow);
1282int btrfs_search_slot_for_read(struct btrfs_root *root,
1283                               const struct btrfs_key *key,
1284                               struct btrfs_path *p, int find_higher,
1285                               int return_any);
1286void btrfs_release_path(struct btrfs_path *p);
1287struct btrfs_path *btrfs_alloc_path(void);
1288void btrfs_free_path(struct btrfs_path *p);
1289static inline void btrfs_init_path(struct btrfs_path *p)
1290{
1291        memset(p, 0, sizeof(*p));
1292}
1293int btrfs_bin_search(struct extent_buffer *eb, const struct btrfs_key *key,
1294                     int *slot);
1295int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *found_path,
1296                u64 iobjectid, u64 ioff, u8 key_type,
1297                struct btrfs_key *found_key);
1298#endif /* __BTRFS_CTREE_H__ */
1299