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 #include "async-thread.h"
  24
  25 struct buffer_head;
  26 struct btrfs_device {
  27         struct list_head dev_list;
  28         struct list_head dev_alloc_list;
  29         struct btrfs_root *dev_root;
  30         struct buffer_head *pending_io;
  31         struct bio *pending_bios;
  32         struct bio *pending_bio_tail;
  33         int running_pending;
  34         u64 generation;
  35
  36         int barriers;
  37         int in_fs_metadata;
  38
  39         spinlock_t io_lock;
  40
  41         struct block_device *bdev;
  42
  43         char *name;
  44
  45         /* the internal btrfs device id */
  46         u64 devid;
  47
  48         /* size of the device */
  49         u64 total_bytes;
  50
  51         /* bytes used */
  52         u64 bytes_used;
  53
  54         /* optimal io alignment for this device */
  55         u32 io_align;
  56
  57         /* optimal io width for this device */
  58         u32 io_width;
  59
  60         /* minimal io size for this device */
  61         u32 sector_size;
  62
  63         /* type and info about this device */
  64         u64 type;
  65
  66         /* physical drive uuid (or lvm uuid) */
  67         u8 uuid[BTRFS_UUID_SIZE];
  68
  69         struct btrfs_work work;
  70 };
  71
  72 struct btrfs_fs_devices {
  73         u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
  74
  75         /* the device with this id has the most recent coyp of the super */
  76         u64 latest_devid;
  77         u64 latest_trans;
  78         u64 num_devices;
  79         u64 open_devices;
  80         struct block_device *latest_bdev;
  81         /* all of the devices in the FS */
  82         struct list_head devices;
  83
  84         /* devices not currently being allocated */
  85         struct list_head alloc_list;
  86         struct list_head list;
  87         int mounted;
  88 };
  89
  90 struct btrfs_bio_stripe {
  91         struct btrfs_device *dev;
  92         u64 physical;
  93 };
  94
  95 struct btrfs_multi_bio {
  96         atomic_t stripes_pending;
  97         bio_end_io_t *end_io;
  98         void *private;
  99         atomic_t error;
 100         int max_errors;
 101         int num_stripes;
 102         struct btrfs_bio_stripe stripes[];
 103 };
 104
 105 #define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \
 106                             (sizeof(struct btrfs_bio_stripe) * (n)))
 107
 108 int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
 109                            struct btrfs_device *device,
 110                            u64 chunk_tree, u64 chunk_objectid,
 111                            u64 chunk_offset,
 112                            u64 num_bytes, u64 *start);
 113 int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
 114                     u64 logical, u64 *length,
 115                     struct btrfs_multi_bio **multi_ret, int mirror_num);
 116 int btrfs_read_sys_array(struct btrfs_root *root);
 117 int btrfs_read_chunk_tree(struct btrfs_root *root);
 118 int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
 119                       struct btrfs_root *extent_root, u64 *start,
 120                       u64 *num_bytes, u64 type);
 121 void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
 122 void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
 123 int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
 124                   int mirror_num, int async_submit);
 125 int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf);
 126 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
 127                        int flags, void *holder);
 128 int btrfs_scan_one_device(const char *path, int flags, void *holder,
 129                           struct btrfs_fs_devices **fs_devices_ret);
 130 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
 131 int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices);
 132 int btrfs_add_device(struct btrfs_trans_handle *trans,
 133                      struct btrfs_root *root,
 134                      struct btrfs_device *device);
 135 int btrfs_rm_device(struct btrfs_root *root, char *device_path);
 136 int btrfs_cleanup_fs_uuids(void);
 137 int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len);
 138 int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree,
 139                       u64 logical, struct page *page);
 140 int btrfs_grow_device(struct btrfs_trans_handle *trans,
 141                       struct btrfs_device *device, u64 new_size);
 142 struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid,
 143                                        u8 *uuid);
 144 int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
 145 int btrfs_init_new_device(struct btrfs_root *root, char *path);
 146 int btrfs_balance(struct btrfs_root *dev_root);
 147 void btrfs_unlock_volumes(void);
 148 void btrfs_lock_volumes(void);
 149 #endif