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volumes.h

/*
 * Copyright (C) 2007 Oracle.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License v2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

#ifndef __BTRFS_VOLUMES_
#define __BTRFS_VOLUMES_
00021 struct btrfs_device {
      struct list_head dev_list;
      struct btrfs_root *dev_root;
      struct btrfs_fs_devices *fs_devices;

      u64 total_ios;

      int fd;

      int writeable;

      char *name;

      /* these are read off the super block, only in the progs */
      char *label;
      u64 total_devs;
      u64 super_bytes_used;

      /* the internal btrfs device id */
      u64 devid;

      /* size of the device */
      u64 total_bytes;

      /* bytes used */
      u64 bytes_used;

      /* optimal io alignment for this device */
      u32 io_align;

      /* optimal io width for this device */
      u32 io_width;

      /* minimal io size for this device */
      u32 sector_size;

      /* type and info about this device */
      u64 type;

      /* physical drive uuid (or lvm uuid) */
      u8 uuid[BTRFS_UUID_SIZE];
};

00064 struct btrfs_fs_devices {
      u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */

      /* the device with this id has the most recent coyp of the super */
      u64 latest_devid;
      u64 latest_trans;
      u64 lowest_devid;
      int latest_bdev;
      int lowest_bdev;
      struct list_head devices;
      struct list_head list;

      int seeding;
      struct btrfs_fs_devices *seed;
};

00080 struct btrfs_bio_stripe {
      struct btrfs_device *dev;
      u64 physical;
};

00085 struct btrfs_multi_bio {
      int error;
      int num_stripes;
      struct btrfs_bio_stripe stripes[];
};

#define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \
                      (sizeof(struct btrfs_bio_stripe) * (n)))

int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
                     struct btrfs_device *device,
                     u64 chunk_tree, u64 chunk_objectid,
                     u64 chunk_offset,
                     u64 num_bytes, u64 *start);
int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
                u64 logical, u64 *length,
                struct btrfs_multi_bio **multi_ret, int mirror_num);
int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
                 u64 chunk_start, u64 physical, u64 devid,
                 u64 **logical, int *naddrs, int *stripe_len);
int btrfs_read_sys_array(struct btrfs_root *root);
int btrfs_read_chunk_tree(struct btrfs_root *root);
int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
                  struct btrfs_root *extent_root, u64 *start,
                  u64 *num_bytes, u64 type);
int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf);
int btrfs_add_device(struct btrfs_trans_handle *trans,
                 struct btrfs_root *root,
                 struct btrfs_device *device);
int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
                   int flags);
int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
int btrfs_add_device(struct btrfs_trans_handle *trans,
                 struct btrfs_root *root,
                 struct btrfs_device *device);
int btrfs_update_device(struct btrfs_trans_handle *trans,
                  struct btrfs_device *device);
int btrfs_scan_one_device(int fd, const char *path,
                    struct btrfs_fs_devices **fs_devices_ret,
                    u64 *total_devs, u64 super_offset);
int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len);
int btrfs_bootstrap_super_map(struct btrfs_mapping_tree *map_tree,
                        struct btrfs_fs_devices *fs_devices);
struct list_head *btrfs_scanned_uuids(void);
int btrfs_add_system_chunk(struct btrfs_trans_handle *trans,
                     struct btrfs_root *root, struct btrfs_key *key,
                     struct btrfs_chunk *chunk, int item_size);
int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
#endif

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