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 #define BTRFS_STRIPE_LEN        (64 * 1024)
  23
  24 struct btrfs_device {
  25         struct list_head dev_list;
  26         struct btrfs_root *dev_root;
  27         struct btrfs_fs_devices *fs_devices;
  28
  29         u64 total_ios;
  30
  31         int fd;
  32
  33         int writeable;
  34
  35         char *name;
  36
  37         /* these are read off the super block, only in the progs */
  38         char *label;
  39         u64 total_devs;
  40         u64 super_bytes_used;
  41
  42         /* the internal btrfs device id */
  43         u64 devid;
  44
  45         /* size of the device */
  46         u64 total_bytes;
  47
  48         /* bytes used */
  49         u64 bytes_used;
  50
  51         /* optimal io alignment for this device */
  52         u32 io_align;
  53
  54         /* optimal io width for this device */
  55         u32 io_width;
  56
  57         /* minimal io size for this device */
  58         u32 sector_size;
  59
  60         /* type and info about this device */
  61         u64 type;
  62
  63         /* physical drive uuid (or lvm uuid) */
  64         u8 uuid[BTRFS_UUID_SIZE];
  65 };
  66
  67 struct btrfs_fs_devices {
  68         u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
  69
  70         /* the device with this id has the most recent coyp of the super */
  71         u64 latest_devid;
  72         u64 latest_trans;
  73         u64 lowest_devid;
  74         int latest_bdev;
  75         int lowest_bdev;
  76         struct list_head devices;
  77         struct list_head list;
  78
  79         int seeding;
  80         struct btrfs_fs_devices *seed;
  81 };
  82
  83 struct btrfs_bio_stripe {
  84         struct btrfs_device *dev;
  85         u64 physical;
  86 };
  87
  88 struct btrfs_multi_bio {
  89         int error;
  90         int num_stripes;
  91         struct btrfs_bio_stripe stripes[];
  92 };
  93
  94 struct map_lookup {
  95         struct cache_extent ce;
  96         u64 type;
  97         int io_align;
  98         int io_width;
  99         int stripe_len;
 100         int sector_size;
 101         int num_stripes;
 102         int sub_stripes;
 103         struct btrfs_bio_stripe stripes[];
 104 };
 105
 106 #define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \
 107                             (sizeof(struct btrfs_bio_stripe) * (n)))
 108 #define btrfs_map_lookup_size(n) (sizeof(struct map_lookup) + \
 109                                  (sizeof(struct btrfs_bio_stripe) * (n)))
 110
 111 /*
 112  * Restriper's general type filter
 113  */
 114 #define BTRFS_BALANCE_DATA              (1ULL << 0)
 115 #define BTRFS_BALANCE_SYSTEM            (1ULL << 1)
 116 #define BTRFS_BALANCE_METADATA          (1ULL << 2)
 117
 118 #define BTRFS_BALANCE_TYPE_MASK         (BTRFS_BALANCE_DATA |       \
 119                                          BTRFS_BALANCE_SYSTEM |     \
 120                                          BTRFS_BALANCE_METADATA)
 121
 122 #define BTRFS_BALANCE_FORCE             (1ULL << 3)
 123 #define BTRFS_BALANCE_RESUME            (1ULL << 4)
 124
 125 /*
 126  * Balance filters
 127  */
 128 #define BTRFS_BALANCE_ARGS_PROFILES     (1ULL << 0)
 129 #define BTRFS_BALANCE_ARGS_USAGE        (1ULL << 1)
 130 #define BTRFS_BALANCE_ARGS_DEVID        (1ULL << 2)
 131 #define BTRFS_BALANCE_ARGS_DRANGE       (1ULL << 3)
 132 #define BTRFS_BALANCE_ARGS_VRANGE       (1ULL << 4)
 133
 134 /*
 135  * Profile changing flags.  When SOFT is set we won't relocate chunk if
 136  * it already has the target profile (even though it may be
 137  * half-filled).
 138  */
 139 #define BTRFS_BALANCE_ARGS_CONVERT      (1ULL << 8)
 140 #define BTRFS_BALANCE_ARGS_SOFT         (1ULL << 9)
 141
 142 #define BTRFS_RAID5_P_STRIPE ((u64)-2)
 143 #define BTRFS_RAID6_Q_STRIPE ((u64)-1)
 144
 145
 146 int __btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
 147                       u64 logical, u64 *length, u64 *type,
 148                       struct btrfs_multi_bio **multi_ret, int mirror_num,
 149                       u64 **raid_map);
 150 int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
 151                     u64 logical, u64 *length,
 152                     struct btrfs_multi_bio **multi_ret, int mirror_num,
 153                     u64 **raid_map_ret);
 154 int btrfs_next_metadata(struct btrfs_mapping_tree *map_tree, u64 *logical,
 155                         u64 *size);
 156 int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
 157                      u64 chunk_start, u64 physical, u64 devid,
 158                      u64 **logical, int *naddrs, int *stripe_len);
 159 int btrfs_read_sys_array(struct btrfs_root *root);
 160 int btrfs_read_chunk_tree(struct btrfs_root *root);
 161 int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
 162                       struct btrfs_root *extent_root, u64 *start,
 163                       u64 *num_bytes, u64 type);
 164 int btrfs_alloc_data_chunk(struct btrfs_trans_handle *trans,
 165                            struct btrfs_root *extent_root, u64 *start,
 166                            u64 num_bytes, u64 type);
 167 int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf);
 168 int btrfs_add_device(struct btrfs_trans_handle *trans,
 169                      struct btrfs_root *root,
 170                      struct btrfs_device *device);
 171 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
 172                        int flags);
 173 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
 174 int btrfs_add_device(struct btrfs_trans_handle *trans,
 175                      struct btrfs_root *root,
 176                      struct btrfs_device *device);
 177 int btrfs_update_device(struct btrfs_trans_handle *trans,
 178                         struct btrfs_device *device);
 179 int btrfs_scan_one_device(int fd, const char *path,
 180                           struct btrfs_fs_devices **fs_devices_ret,
 181                           u64 *total_devs, u64 super_offset);
 182 int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len);
 183 struct list_head *btrfs_scanned_uuids(void);
 184 int btrfs_add_system_chunk(struct btrfs_trans_handle *trans,
 185                            struct btrfs_root *root, struct btrfs_key *key,
 186                            struct btrfs_chunk *chunk, int item_size);
 187 int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
 188 struct btrfs_device *
 189 btrfs_find_device_by_devid(struct btrfs_fs_devices *fs_devices,
 190                            u64 devid, int instance);
 191 struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid,
 192                                        u8 *uuid, u8 *fsid);
 193 int write_raid56_with_parity(struct btrfs_fs_info *info,
 194                              struct extent_buffer *eb,
 195                              struct btrfs_multi_bio *multi,
 196                              u64 stripe_len, u64 *raid_map);
 197 #endif