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 buffer_head;
  25 struct btrfs_device {
  26         struct list_head dev_list;
  27         struct list_head dev_alloc_list;
  28         struct btrfs_root *dev_root;
  29         struct buffer_head *pending_io;
  30         u64 generation;
  31
  32         int barriers;
  33         int in_fs_metadata;
  34
  35         spinlock_t io_lock;
  36
  37         struct block_device *bdev;
  38
  39         u64 total_ios;
  40
  41         char *name;
  42
  43         /* the internal btrfs device id */
  44         u64 devid;
  45
  46         /* size of the device */
  47         u64 total_bytes;
  48
  49         /* bytes used */
  50         u64 bytes_used;
  51
  52         /* optimal io alignment for this device */
  53         u32 io_align;
  54
  55         /* optimal io width for this device */
  56         u32 io_width;
  57
  58         /* minimal io size for this device */
  59         u32 sector_size;
  60
  61         /* type and info about this device */
  62         u64 type;
  63
  64         /* physical drive uuid (or lvm uuid) */
  65         u8 uuid[BTRFS_UUID_SIZE];
  66 };
  67
  68 struct btrfs_fs_devices {
  69         u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
  70
  71         /* the device with this id has the most recent coyp of the super */
  72         u64 latest_devid;
  73         u64 latest_trans;
  74         u64 lowest_devid;
  75         u64 num_devices;
  76         struct block_device *latest_bdev;
  77         struct block_device *lowest_bdev;
  78         /* all of the devices in the FS */
  79         struct list_head devices;
  80
  81         /* devices not currently being allocated */
  82         struct list_head alloc_list;
  83         struct list_head list;
  84 };
  85
  86 struct btrfs_bio_stripe {
  87         struct btrfs_device *dev;
  88         u64 physical;
  89 };
  90
  91 struct btrfs_multi_bio {
  92         atomic_t stripes_pending;
  93         bio_end_io_t *end_io;
  94         void *private;
  95         atomic_t error;
  96         int max_errors;
  97         int num_stripes;
  98         struct btrfs_bio_stripe stripes[];
  99 };
 100
 101 #define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \
 102                             (sizeof(struct btrfs_bio_stripe) * (n)))
 103
 104 int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
 105                            struct btrfs_device *device,
 106                            u64 chunk_tree, u64 chunk_objectid,
 107                            u64 chunk_offset,
 108                            u64 num_bytes, u64 *start);
 109 int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
 110                     u64 logical, u64 *length,
 111                     struct btrfs_multi_bio **multi_ret, int mirror_num);
 112 int btrfs_read_sys_array(struct btrfs_root *root);
 113 int btrfs_read_chunk_tree(struct btrfs_root *root);
 114 int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
 115                       struct btrfs_root *extent_root, u64 *start,
 116                       u64 *num_bytes, u64 type);
 117 void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
 118 void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
 119 int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
 120                   int mirror_num);
 121 int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf);
 122 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
 123                        int flags, void *holder);
 124 int btrfs_scan_one_device(const char *path, int flags, void *holder,
 125                           struct btrfs_fs_devices **fs_devices_ret);
 126 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
 127 int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices);
 128 int btrfs_add_device(struct btrfs_trans_handle *trans,
 129                      struct btrfs_root *root,
 130                      struct btrfs_device *device);
 131 int btrfs_rm_device(struct btrfs_root *root, char *device_path);
 132 int btrfs_cleanup_fs_uuids(void);
 133 int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len);
 134 int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree,
 135                       u64 logical, struct page *page);
 136 int btrfs_grow_device(struct btrfs_trans_handle *trans,
 137                       struct btrfs_device *device, u64 new_size);
 138 struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid,
 139                                        u8 *uuid);
 140 int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
 141 int btrfs_init_new_device(struct btrfs_root *root, char *path);
 142 int btrfs_balance(struct btrfs_root *dev_root);
 143 void btrfs_unlock_volumes(void);
 144 void btrfs_lock_volumes(void);
 145 #endif