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