volumes.h

   1 /*
   2  * Copyright (C) 2007 Oracle.  All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public
   6  * License v2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public
  14  * License along with this program; if not, write to the
  15  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  16  * Boston, MA 021110-1307, USA.
  17  */
  18
  19 #ifndef __BTRFS_VOLUMES_
  20 #define __BTRFS_VOLUMES_
  21
  22 struct btrfs_device {
  23         struct list_head dev_list;
  24         struct btrfs_root *dev_root;
  25         struct btrfs_fs_devices *fs_devices;
  26
  27         u64 total_ios;
  28
  29         int fd;
  30
  31         int writeable;
  32
  33         char *name;
  34
  35         /* these are read off the super block, only in the progs */
  36         char *label;
  37         u64 total_devs;
  38         u64 super_bytes_used;
  39
  40         /* the internal btrfs device id */
  41         u64 devid;
  42
  43         /* size of the device */
  44         u64 total_bytes;
  45
  46         /* bytes used */
  47         u64 bytes_used;
  48
  49         /* optimal io alignment for this device */
  50         u32 io_align;
  51
  52         /* optimal io width for this device */
  53         u32 io_width;
  54
  55         /* minimal io size for this device */
  56         u32 sector_size;
  57
  58         /* type and info about this device */
  59         u64 type;
  60
  61         /* physical drive uuid (or lvm uuid) */
  62         u8 uuid[BTRFS_UUID_SIZE];
  63 };
  64
  65 struct btrfs_fs_devices {
  66         u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
  67
  68         /* the device with this id has the most recent coyp of the super */
  69         u64 latest_devid;
  70         u64 latest_trans;
  71         u64 lowest_devid;
  72         int latest_bdev;
  73         int lowest_bdev;
  74         struct list_head devices;
  75         struct list_head list;
  76
  77         int seeding;
  78         struct btrfs_fs_devices *seed;
  79 };
  80
  81 struct btrfs_bio_stripe {
  82         struct btrfs_device *dev;
  83         u64 physical;
  84 };
  85
  86 struct btrfs_multi_bio {
  87         int error;
  88         int num_stripes;
  89         struct btrfs_bio_stripe stripes[];
  90 };
  91
  92 struct map_lookup {
  93         struct cache_extent ce;
  94         u64 type;
  95         int io_align;
  96         int io_width;
  97         int stripe_len;
  98         int sector_size;
  99         int num_stripes;
 100         int sub_stripes;
 101         struct btrfs_bio_stripe stripes[];
 102 };
 103
 104 #define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \
 105                             (sizeof(struct btrfs_bio_stripe) * (n)))
 106
 107 /*
 108  * Restriper's general type filter
 109  */
 110 #define BTRFS_BALANCE_DATA              (1ULL << 0)
 111 #define BTRFS_BALANCE_SYSTEM            (1ULL << 1)
 112 #define BTRFS_BALANCE_METADATA          (1ULL << 2)
 113
 114 #define BTRFS_BALANCE_TYPE_MASK         (BTRFS_BALANCE_DATA |       \
 115                                          BTRFS_BALANCE_SYSTEM |     \
 116                                          BTRFS_BALANCE_METADATA)
 117
 118 #define BTRFS_BALANCE_FORCE             (1ULL << 3)
 119 #define BTRFS_BALANCE_RESUME            (1ULL << 4)
 120
 121 /*
 122  * Balance filters
 123  */
 124 #define BTRFS_BALANCE_ARGS_PROFILES     (1ULL << 0)
 125 #define BTRFS_BALANCE_ARGS_USAGE        (1ULL << 1)
 126 #define BTRFS_BALANCE_ARGS_DEVID        (1ULL << 2)
 127 #define BTRFS_BALANCE_ARGS_DRANGE       (1ULL << 3)
 128 #define BTRFS_BALANCE_ARGS_VRANGE       (1ULL << 4)
 129
 130 /*
 131  * Profile changing flags.  When SOFT is set we won't relocate chunk if
 132  * it already has the target profile (even though it may be
 133  * half-filled).
 134  */
 135 #define BTRFS_BALANCE_ARGS_CONVERT      (1ULL << 8)
 136 #define BTRFS_BALANCE_ARGS_SOFT         (1ULL << 9)
 137
 138 int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
 139                            struct btrfs_device *device,
 140                            u64 chunk_tree, u64 chunk_objectid,
 141                            u64 chunk_offset,
 142                            u64 num_bytes, u64 *start);
 143 int __btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
 144                       u64 logical, u64 *length, u64 *type,
 145                       struct btrfs_multi_bio **multi_ret, int mirror_num);
 146 int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
 147                     u64 logical, u64 *length,
 148                     struct btrfs_multi_bio **multi_ret, int mirror_num);
 149 int btrfs_next_metadata(struct btrfs_mapping_tree *map_tree, u64 *logical,
 150                         u64 *size);
 151 int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
 152                      u64 chunk_start, u64 physical, u64 devid,
 153                      u64 **logical, int *naddrs, int *stripe_len);
 154 int btrfs_read_sys_array(struct btrfs_root *root);
 155 int btrfs_read_chunk_tree(struct btrfs_root *root);
 156 int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
 157                       struct btrfs_root *extent_root, u64 *start,
 158                       u64 *num_bytes, u64 type);
 159 int btrfs_alloc_data_chunk(struct btrfs_trans_handle *trans,
 160                            struct btrfs_root *extent_root, u64 *start,
 161                            u64 num_bytes, u64 type);
 162 int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf);
 163 int btrfs_add_device(struct btrfs_trans_handle *trans,
 164                      struct btrfs_root *root,
 165                      struct btrfs_device *device);
 166 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
 167                        int flags);
 168 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
 169 int btrfs_add_device(struct btrfs_trans_handle *trans,
 170                      struct btrfs_root *root,
 171                      struct btrfs_device *device);
 172 int btrfs_update_device(struct btrfs_trans_handle *trans,
 173                         struct btrfs_device *device);
 174 int btrfs_scan_one_device(int fd, const char *path,
 175                           struct btrfs_fs_devices **fs_devices_ret,
 176                           u64 *total_devs, u64 super_offset);
 177 int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len);
 178 int btrfs_bootstrap_super_map(struct btrfs_mapping_tree *map_tree,
 179                               struct btrfs_fs_devices *fs_devices);
 180 struct list_head *btrfs_scanned_uuids(void);
 181 int btrfs_add_system_chunk(struct btrfs_trans_handle *trans,
 182                            struct btrfs_root *root, struct btrfs_key *key,
 183                            struct btrfs_chunk *chunk, int item_size);
 184 int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
 185 #endif