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