fs/btrfs/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         spinlock_t io_lock;
  26
  27         struct block_device *bdev;
  28
  29         u64 total_ios;
  30
  31         char *name;
  32
  33         /* the internal btrfs device id */
  34         u64 devid;
  35
  36         /* size of the device */
  37         u64 total_bytes;
  38
  39         /* bytes used */
  40         u64 bytes_used;
  41
  42         /* optimal io alignment for this device */
  43         u32 io_align;
  44
  45         /* optimal io width for this device */
  46         u32 io_width;
  47
  48         /* minimal io size for this device */
  49         u32 sector_size;
  50
  51         /* type and info about this device */
  52         u64 type;
  53
  54         /* physical drive uuid (or lvm uuid) */
  55         u8 uuid[BTRFS_DEV_UUID_SIZE];
  56 };
  57
  58 struct btrfs_fs_devices {
  59         u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
  60
  61         /* the device with this id has the most recent coyp of the super */
  62         u64 latest_devid;
  63         u64 latest_trans;
  64         u64 lowest_devid;
  65         u64 num_devices;
  66         struct block_device *latest_bdev;
  67         struct block_device *lowest_bdev;
  68         struct list_head devices;
  69         struct list_head list;
  70 };
  71
  72 int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
  73                            struct btrfs_device *device,
  74                            u64 owner, u64 num_bytes, u64 *start);
  75 int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, int stripe_nr,
  76                     u64 logical, u64 *phys, u64 *length,
  77                     struct btrfs_device **dev, int *total_stripes);
  78 int btrfs_read_sys_array(struct btrfs_root *root);
  79 int btrfs_read_chunk_tree(struct btrfs_root *root);
  80 int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
  81                       struct btrfs_root *extent_root, u64 *start,
  82                       u64 *num_bytes, u64 type);
  83 void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
  84 void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
  85 int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio);
  86 int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf);
  87 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
  88                        int flags, void *holder);
  89 int btrfs_scan_one_device(const char *path, int flags, void *holder,
  90                           struct btrfs_fs_devices **fs_devices_ret);
  91 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
  92 int btrfs_add_device(struct btrfs_trans_handle *trans,
  93                      struct btrfs_root *root,
  94                      struct btrfs_device *device);
  95 int btrfs_cleanup_fs_uuids(void);
  96 #endif