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
  25         u64 total_ios;
  26
  27         int fd;
  28
  29         char *name;
  30
  31         /* these are read off the super block, only in the progs */
  32         char *label;
  33         u64 total_devs;
  34         u64 super_bytes_used;
  35
  36         /* the internal btrfs device id */
  37         u64 devid;
  38
  39         /* size of the device */
  40         u64 total_bytes;
  41
  42         /* bytes used */
  43         u64 bytes_used;
  44
  45         /* optimal io alignment for this device */
  46         u32 io_align;
  47
  48         /* optimal io width for this device */
  49         u32 io_width;
  50
  51         /* minimal io size for this device */
  52         u32 sector_size;
  53
  54         /* type and info about this device */
  55         u64 type;
  56
  57         /* physical drive uuid (or lvm uuid) */
  58         u8 uuid[BTRFS_UUID_SIZE];
  59 };
  60
  61 struct btrfs_fs_devices {
  62         u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
  63
  64         /* the device with this id has the most recent coyp of the super */
  65         u64 latest_devid;
  66         u64 latest_trans;
  67         u64 lowest_devid;
  68         int latest_bdev;
  69         int lowest_bdev;
  70         struct list_head devices;
  71         struct list_head list;
  72 };
  73
  74 struct btrfs_bio_stripe {
  75         struct btrfs_device *dev;
  76         u64 physical;
  77 };
  78
  79 struct btrfs_multi_bio {
  80         int error;
  81         int num_stripes;
  82         struct btrfs_bio_stripe stripes[];
  83 };
  84
  85 #define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \
  86                             (sizeof(struct btrfs_bio_stripe) * (n)))
  87
  88 int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
  89                            struct btrfs_device *device,
  90                            u64 chunk_tree, u64 chunk_objectid,
  91                            u64 chunk_offset,
  92                            u64 num_bytes, u64 *start);
  93 int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
  94                     u64 logical, u64 *length,
  95                     struct btrfs_multi_bio **multi_ret, int mirror_num);
  96 int btrfs_read_sys_array(struct btrfs_root *root);
  97 int btrfs_read_chunk_tree(struct btrfs_root *root);
  98 int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
  99                       struct btrfs_root *extent_root, u64 *start,
 100                       u64 *num_bytes, u64 type);
 101 int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf);
 102 int btrfs_add_device(struct btrfs_trans_handle *trans,
 103                      struct btrfs_root *root,
 104                      struct btrfs_device *device);
 105 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
 106                        int flags);
 107 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
 108 int btrfs_add_device(struct btrfs_trans_handle *trans,
 109                      struct btrfs_root *root,
 110                      struct btrfs_device *device);
 111 int btrfs_update_device(struct btrfs_trans_handle *trans,
 112                         struct btrfs_device *device);
 113 int btrfs_scan_one_device(int fd, const char *path,
 114                           struct btrfs_fs_devices **fs_devices_ret,
 115                           u64 *total_devs, u64 super_offset);
 116 int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len);
 117 int btrfs_bootstrap_super_map(struct btrfs_mapping_tree *map_tree,
 118                               struct btrfs_fs_devices *fs_devices);
 119 struct list_head *btrfs_scanned_uuids(void);
 120 int btrfs_add_system_chunk(struct btrfs_trans_handle *trans,
 121                            struct btrfs_root *root, struct btrfs_key *key,
 122                            struct btrfs_chunk *chunk, int item_size);
 123 #endif