extlinux/btrfs.h

   1 #ifndef _BTRFS_H_
   2 #define _BTRFS_H_
   3
   4 #include <asm/types.h>
   5 #include <linux/ioctl.h>
   6
   7 #define BTRFS_SUPER_MAGIC 0x9123683E
   8 #define BTRFS_SUPER_INFO_OFFSET (64 * 1024)
   9 #define BTRFS_SUPER_INFO_SIZE 4096
  10 #define BTRFS_MAGIC "_BHRfS_M"
  11 #define BTRFS_MAGIC_L 8
  12 #define BTRFS_CSUM_SIZE 32
  13 #define BTRFS_FSID_SIZE 16
  14 #define BTRFS_UUID_SIZE 16
  15
  16 /* Fixed areas reserved for the boot loader */
  17 #define BTRFS_BOOT_AREA_A_OFFSET        0
  18 #define BTRFS_BOOT_AREA_A_SIZE          BTRFS_SUPER_INFO_OFFSET
  19 #define BTRFS_BOOT_AREA_B_OFFSET        (256 * 1024)
  20 #define BTRFS_BOOT_AREA_B_SIZE          ((1024-256) * 1024)
  21
  22 typedef __u64 u64;
  23 typedef __u32 u32;
  24 typedef __u16 u16;
  25 typedef __u8 u8;
  26 typedef u64 __le64;
  27 typedef u16 __le16;
  28
  29 #define BTRFS_ROOT_BACKREF_KEY  144
  30 #define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
  31 #define BTRFS_DIR_ITEM_KEY      84
  32
  33 /*
  34  *  * this is used for both forward and backward root refs
  35  *   */
  36 struct btrfs_root_ref {
  37         __le64 dirid;
  38         __le64 sequence;
  39         __le16 name_len;
  40 } __attribute__ ((__packed__));
  41
  42 struct btrfs_disk_key {
  43         __le64 objectid;
  44         u8 type;
  45         __le64 offset;
  46 } __attribute__ ((__packed__));
  47
  48 struct btrfs_dir_item {
  49         struct btrfs_disk_key location;
  50         __le64 transid;
  51         __le16 data_len;
  52         __le16 name_len;
  53         u8 type;
  54 } __attribute__ ((__packed__));
  55
  56 struct btrfs_super_block {
  57         uint8_t csum[32];
  58         uint8_t fsid[16];
  59         uint64_t bytenr;
  60         uint64_t flags;
  61         uint8_t magic[8];
  62         uint64_t generation;
  63         uint64_t root;
  64         uint64_t chunk_root;
  65         uint64_t log_root;
  66         uint64_t log_root_transid;
  67         uint64_t total_bytes;
  68         uint64_t bytes_used;
  69         uint64_t root_dir_objectid;
  70         uint64_t num_devices;
  71         uint32_t sectorsize;
  72         uint32_t nodesize;
  73         uint32_t leafsize;
  74         uint32_t stripesize;
  75         uint32_t sys_chunk_array_size;
  76         uint64_t chunk_root_generation;
  77         uint64_t compat_flags;
  78         uint64_t compat_ro_flags;
  79         uint64_t incompat_flags;
  80         uint16_t csum_type;
  81         uint8_t root_level;
  82         uint8_t chunk_root_level;
  83         uint8_t log_root_level;
  84         struct btrfs_dev_item {
  85                 uint64_t devid;
  86                 uint64_t total_bytes;
  87                 uint64_t bytes_used;
  88                 uint32_t io_align;
  89                 uint32_t io_width;
  90                 uint32_t sector_size;
  91                 uint64_t type;
  92                 uint64_t generation;
  93                 uint64_t start_offset;
  94                 uint32_t dev_group;
  95                 uint8_t seek_speed;
  96                 uint8_t bandwidth;
  97                 uint8_t uuid[16];
  98                 uint8_t fsid[16];
  99         } __attribute__ ((__packed__)) dev_item;
 100         uint8_t label[256];
 101 } __attribute__ ((__packed__));
 102
 103 #define BTRFS_IOCTL_MAGIC 0x94
 104 #define BTRFS_VOL_NAME_MAX 255
 105 #define BTRFS_PATH_NAME_MAX 4087
 106
 107 struct btrfs_ioctl_vol_args {
 108         __s64 fd;
 109         char name[BTRFS_PATH_NAME_MAX + 1];
 110 };
 111
 112 struct btrfs_ioctl_search_key {
 113         /* which root are we searching.  0 is the tree of tree roots */
 114         __u64 tree_id;
 115
 116         /* keys returned will be >= min and <= max */
 117         __u64 min_objectid;
 118         __u64 max_objectid;
 119
 120         /* keys returned will be >= min and <= max */
 121         __u64 min_offset;
 122         __u64 max_offset;
 123
 124         /* max and min transids to search for */
 125         __u64 min_transid;
 126         __u64 max_transid;
 127
 128         /* keys returned will be >= min and <= max */
 129         __u32 min_type;
 130         __u32 max_type;
 131
 132         /*
 133          * how many items did userland ask for, and how many are we
 134          * returning
 135          */
 136         __u32 nr_items;
 137
 138         /* align to 64 bits */
 139         __u32 unused;
 140
 141         /* some extra for later */
 142         __u64 unused1;
 143         __u64 unused2;
 144         __u64 unused3;
 145         __u64 unused4;
 146 };
 147
 148 struct btrfs_ioctl_search_header {
 149         __u64 transid;
 150         __u64 objectid;
 151         __u64 offset;
 152         __u32 type;
 153         __u32 len;
 154 } __attribute__((may_alias));
 155
 156 #define BTRFS_DEVICE_PATH_NAME_MAX 1024
 157 struct btrfs_ioctl_dev_info_args {
 158         __u64 devid;                            /* in/out */
 159         __u8 uuid[BTRFS_UUID_SIZE];             /* in/out */
 160         __u64 bytes_used;                       /* out */
 161         __u64 total_bytes;                      /* out */
 162         __u64 unused[379];                      /* pad to 4k */
 163         __u8 path[BTRFS_DEVICE_PATH_NAME_MAX];  /* out */
 164 };
 165
 166 struct btrfs_ioctl_fs_info_args {
 167         __u64 max_id;                           /* out */
 168         __u64 num_devices;                      /* out */
 169         __u8 fsid[BTRFS_FSID_SIZE];             /* out */
 170         __u64 reserved[124];                    /* pad to 1k */
 171 };
 172
 173 #define BTRFS_SEARCH_ARGS_BUFSIZE (4096 - sizeof(struct btrfs_ioctl_search_key))
 174 /*
 175  * the buf is an array of search headers where
 176  * each header is followed by the actual item
 177  * the type field is expanded to 32 bits for alignment
 178  */
 179 struct btrfs_ioctl_search_args {
 180         struct btrfs_ioctl_search_key key;
 181         char buf[BTRFS_SEARCH_ARGS_BUFSIZE];
 182 };
 183
 184 #define BTRFS_IOC_TREE_SEARCH _IOWR(BTRFS_IOCTL_MAGIC, 17, \
 185                                    struct btrfs_ioctl_search_args)
 186 #define BTRFS_IOC_DEV_INFO _IOWR(BTRFS_IOCTL_MAGIC, 30, \
 187                                  struct btrfs_ioctl_dev_info_args)
 188 #define BTRFS_IOC_FS_INFO _IOR(BTRFS_IOCTL_MAGIC, 31, \
 189                                struct btrfs_ioctl_fs_info_args)
 190
 191 #endif