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 #include <linux/bio.h>
  23
  24 struct btrfs_device {
  25         struct list_head dev_list;
  26         struct btrfs_root *dev_root;
  27         spinlock_t io_lock;
  28
  29         struct block_device *bdev;
  30
  31         u64 total_ios;
  32
  33         char *name;
  34
  35         /* the internal btrfs device id */
  36         u64 devid;
  37
  38         /* size of the device */
  39         u64 total_bytes;
  40
  41         /* bytes used */
  42         u64 bytes_used;
  43
  44         /* optimal io alignment for this device */
  45         u32 io_align;
  46
  47         /* optimal io width for this device */
  48         u32 io_width;
  49
  50         /* minimal io size for this device */
  51         u32 sector_size;
  52
  53         /* type and info about this device */
  54         u64 type;
  55
  56         /* physical drive uuid (or lvm uuid) */
  57         u8 uuid[BTRFS_DEV_UUID_SIZE];
  58 };
  59
  60 struct btrfs_fs_devices {
  61         u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
  62
  63         /* the device with this id has the most recent coyp of the super */
  64         u64 latest_devid;
  65         u64 latest_trans;
  66         u64 lowest_devid;
  67         u64 num_devices;
  68         struct block_device *latest_bdev;
  69         struct block_device *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         atomic_t stripes_pending;
  81         bio_end_io_t *end_io;
  82         void *private;
  83         int error;
  84         int num_stripes;
  85         struct btrfs_bio_stripe stripes[];
  86 };
  87
  88 #define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \
  89                             (sizeof(struct btrfs_bio_stripe) * (n)))
  90
  91 int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
  92                            struct btrfs_device *device,
  93                            u64 owner, u64 num_bytes, u64 *start);
  94 int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
  95                     u64 logical, u64 *length,
  96                     struct btrfs_multi_bio **multi_ret);
  97 int btrfs_read_sys_array(struct btrfs_root *root);
  98 int btrfs_read_chunk_tree(struct btrfs_root *root);
  99 int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
 100                       struct btrfs_root *extent_root, u64 *start,
 101                       u64 *num_bytes, u64 type);
 102 void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
 103 void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
 104 int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio);
 105 int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf);
 106 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
 107                        int flags, void *holder);
 108 int btrfs_scan_one_device(const char *path, int flags, void *holder,
 109                           struct btrfs_fs_devices **fs_devices_ret);
 110 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
 111 int btrfs_add_device(struct btrfs_trans_handle *trans,
 112                      struct btrfs_root *root,
 113                      struct btrfs_device *device);
 114 int btrfs_cleanup_fs_uuids(void);
 115 #endif