LXR linux/fs/btrfs/qgroup.h

   1/*
   2 * Copyright (C) 2014 Facebook.  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_QGROUP__
  20#define __BTRFS_QGROUP__
  21
  22/*
  23 * A description of the operations, all of these operations only happen when we
  24 * are adding the 1st reference for that subvolume in the case of adding space
  25 * or on the last reference delete in the case of subtraction.  The only
  26 * exception is the last one, which is added for confusion.
  27 *
  28 * BTRFS_QGROUP_OPER_ADD_EXCL: adding bytes where this subvolume is the only
  29 * one pointing at the bytes we are adding.  This is called on the first
  30 * allocation.
  31 *
  32 * BTRFS_QGROUP_OPER_ADD_SHARED: adding bytes where this bytenr is going to be
  33 * shared between subvols.  This is called on the creation of a ref that already
  34 * has refs from a different subvolume, so basically reflink.
  35 *
  36 * BTRFS_QGROUP_OPER_SUB_EXCL: removing bytes where this subvolume is the only
  37 * one referencing the range.
  38 *
  39 * BTRFS_QGROUP_OPER_SUB_SHARED: removing bytes where this subvolume shares with
  40 * refs with other subvolumes.
  41 */
  42enum btrfs_qgroup_operation_type {
  43        BTRFS_QGROUP_OPER_ADD_EXCL,
  44        BTRFS_QGROUP_OPER_ADD_SHARED,
  45        BTRFS_QGROUP_OPER_SUB_EXCL,
  46        BTRFS_QGROUP_OPER_SUB_SHARED,
  47};
  48
  49struct btrfs_qgroup_operation {
  50        u64 ref_root;
  51        u64 bytenr;
  52        u64 num_bytes;
  53        u64 seq;
  54        enum btrfs_qgroup_operation_type type;
  55        struct seq_list elem;
  56        struct rb_node n;
  57        struct list_head list;
  58};
  59
  60int btrfs_quota_enable(struct btrfs_trans_handle *trans,
  61                       struct btrfs_fs_info *fs_info);
  62int btrfs_quota_disable(struct btrfs_trans_handle *trans,
  63                        struct btrfs_fs_info *fs_info);
  64int btrfs_qgroup_rescan(struct btrfs_fs_info *fs_info);
  65void btrfs_qgroup_rescan_resume(struct btrfs_fs_info *fs_info);
  66int btrfs_qgroup_wait_for_completion(struct btrfs_fs_info *fs_info);
  67int btrfs_add_qgroup_relation(struct btrfs_trans_handle *trans,
  68                              struct btrfs_fs_info *fs_info, u64 src, u64 dst);
  69int btrfs_del_qgroup_relation(struct btrfs_trans_handle *trans,
  70                              struct btrfs_fs_info *fs_info, u64 src, u64 dst);
  71int btrfs_create_qgroup(struct btrfs_trans_handle *trans,
  72                        struct btrfs_fs_info *fs_info, u64 qgroupid,
  73                        char *name);
  74int btrfs_remove_qgroup(struct btrfs_trans_handle *trans,
  75                              struct btrfs_fs_info *fs_info, u64 qgroupid);
  76int btrfs_limit_qgroup(struct btrfs_trans_handle *trans,
  77                       struct btrfs_fs_info *fs_info, u64 qgroupid,
  78                       struct btrfs_qgroup_limit *limit);
  79int btrfs_read_qgroup_config(struct btrfs_fs_info *fs_info);
  80void btrfs_free_qgroup_config(struct btrfs_fs_info *fs_info);
  81struct btrfs_delayed_extent_op;
  82int btrfs_qgroup_record_ref(struct btrfs_trans_handle *trans,
  83                            struct btrfs_fs_info *fs_info, u64 ref_root,
  84                            u64 bytenr, u64 num_bytes,
  85                            enum btrfs_qgroup_operation_type type,
  86                            int mod_seq);
  87int btrfs_delayed_qgroup_accounting(struct btrfs_trans_handle *trans,
  88                                    struct btrfs_fs_info *fs_info);
  89void btrfs_remove_qgroup_operation(struct btrfs_trans_handle *trans,
  90                                   struct btrfs_fs_info *fs_info,
  91                                   struct btrfs_qgroup_operation *oper);
  92int btrfs_run_qgroups(struct btrfs_trans_handle *trans,
  93                      struct btrfs_fs_info *fs_info);
  94int btrfs_qgroup_inherit(struct btrfs_trans_handle *trans,
  95                         struct btrfs_fs_info *fs_info, u64 srcid, u64 objectid,
  96                         struct btrfs_qgroup_inherit *inherit);
  97int btrfs_qgroup_reserve(struct btrfs_root *root, u64 num_bytes);
  98void btrfs_qgroup_free(struct btrfs_root *root, u64 num_bytes);
  99
 100void assert_qgroups_uptodate(struct btrfs_trans_handle *trans);
 101
 102#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
 103int btrfs_verify_qgroup_counts(struct btrfs_fs_info *fs_info, u64 qgroupid,
 104                               u64 rfer, u64 excl);
 105#endif
 106
 107#endif /* __BTRFS_QGROUP__ */
 108