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BTRFS: Added more on-disk data structures

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This commit is contained in:
hyche 2017-07-02 23:53:20 +07:00
parent 9f9ba0bdc1
commit 052a981c14
1 changed files with 110 additions and 1 deletions
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111
src/add-ons/kernel/file_systems/btrfs/btrfs.h
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@ -12,8 +12,61 @@
typedef uint64 fileblock_t; // file block number
typedef uint64 fsblock_t; // filesystem block number
#define BTRFS_SUPER_BLOCK_OFFSET 0x10000
#define BTRFS_NUM_ROOT_BACKUPS 4
struct btrfs_backup_roots {
uint64 root;
uint64 root_generation;
uint64 chunk_root;
uint64 chunk_root_generation;
uint64 extent_root;
uint64 extent_root_generation;
uint64 fs_root;
uint64 fs_root_generation;
uint64 device_root;
uint64 device_root_generation;
uint64 csum_root;
uint64 csum_root_generation;
uint64 total_size;
uint64 used_size;
uint64 num_devices;
uint8 unused_1[32];
uint8 root_level;
uint8 chunk_root_level;
uint8 extent_root_level;
uint8 fs_root_level;
uint8 device_root_level;
uint8 csum_root_level;
uint8 unused_2[10];
uint64 Root() const { return B_LENDIAN_TO_HOST_INT64(root); }
uint64 RootGen() const
{ return B_LENDIAN_TO_HOST_INT64(root_generation); }
uint64 ChunkRoot() const { return B_LENDIAN_TO_HOST_INT64(chunk_root); }
uint64 ChunkRootGen() const
{ return B_LENDIAN_TO_HOST_INT64(chunk_root_generation); }
uint64 ExtentRoot() const { return B_LENDIAN_TO_HOST_INT64(extent_root); }
uint64 ExtentRootGen() const
{ return B_LENDIAN_TO_HOST_INT64(extent_root_generation); }
uint64 FSRoot() const { return B_LENDIAN_TO_HOST_INT64(fs_root); }
uint64 FSRootGen() const
{ return B_LENDIAN_TO_HOST_INT64(fs_root_generation); }
uint64 DeviceRoot() const { return B_LENDIAN_TO_HOST_INT64(device_root); }
uint64 DeviceRootGen() const
{ return B_LENDIAN_TO_HOST_INT64(device_root_generation); }
uint64 CSumRoot() const { return B_LENDIAN_TO_HOST_INT64(csum_root); }
uint64 CSumRootGen() const
{ return B_LENDIAN_TO_HOST_INT64(csum_root_generation); }
uint8 RootLevel() const { return root_level; }
uint8 ChunkRootLevel() const { return chunk_root_level; }
uint8 ExtentRootLevel() const { return extent_root_level; }
uint8 FSRootLevel() const { return fs_root_level; }
uint8 DeviceRootLevel() const { return device_root_level; }
uint8 CSumRootLevel() const { return csum_root_level; }
} _PACKED;
struct btrfs_key {
uint64 object_id;
@ -177,6 +230,7 @@ struct btrfs_super_block {
char label[256];
uint64 reserved[32];
uint8 system_chunk_array[2048];
btrfs_backup_roots backup_roots[BTRFS_NUM_ROOT_BACKUPS];
bool IsValid();
// implemented in Volume.cpp
@ -239,6 +293,16 @@ struct btrfs_inode {
} _PACKED;
struct btrfs_inode_ref {
uint8 index;
uint16 name_length;
uint8 name[];
uint8 Index() const { return index; }
uint16 NameLength() const { return B_LENDIAN_TO_HOST_INT16(name_length); }
} _PACKED;
struct btrfs_root {
btrfs_inode inode;
uint64 generation;
@ -306,6 +370,51 @@ struct btrfs_extent_data {
} _PACKED;
struct btrfs_block_group {
uint64 used_space;
uint64 chunk_object_id;
uint64 flags;
uint64 UsedSpace() const { return B_LENDIAN_TO_HOST_INT64(used_space); }
uint64 ChunkObjectID() const
{ return B_HOST_TO_LENDIAN_INT64(chunk_object_id); }
uint64 Flags() const { return B_LENDIAN_TO_HOST_INT64(flags); }
} _PACKED;
struct btrfs_extent {
uint64 refs;
uint64 generation;
uint64 flags;
uint64 RefCount() const { return B_LENDIAN_TO_HOST_INT64(refs); }
uint64 Generation() const { return B_LENDIAN_TO_HOST_INT64(generation); }
uint64 Flags() const { return B_LENDIAN_TO_HOST_INT64(flags); }
} _PACKED;
struct btrfs_extent_inline_ref {
uint8 type;
uint64 offset;
uint8 Type() const { return type; }
uint64 Offset() const { return B_LENDIAN_TO_HOST_INT64(offset); }
} _PACKED;
struct btrfs_extent_data_ref {
uint64 root_id;
uint64 inode_id;
uint64 offset;
uint32 ref_count;
uint64 RootID() const { return B_LENDIAN_TO_HOST_INT64(root_id); }
uint64 InodeID() const { return B_LENDIAN_TO_HOST_INT64(inode_id); }
uint64 Offset() const { return B_LENDIAN_TO_HOST_INT64(offset);}
uint32 RefCount() const { return B_LENDIAN_TO_HOST_INT32(ref_count); }
} _PACKED;
#define BTRFS_SUPER_BLOCK_MAGIC "_BHRfS_M"
#define BTRFS_FIRST_SUBVOLUME 256