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