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  */
  42 enum 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         BTRFS_QGROUP_OPER_SUB_SUBTREE,
  48 };
  49
  50 struct btrfs_qgroup_operation {
  51         u64 ref_root;
  52         u64 bytenr;
  53         u64 num_bytes;
  54         u64 seq;
  55         enum btrfs_qgroup_operation_type type;
  56         struct seq_list elem;
  57         struct rb_node n;
  58         struct list_head list;
  59 };
  60
  61 int btrfs_quota_enable(struct btrfs_trans_handle *trans,
  62                        struct btrfs_fs_info *fs_info);
  63 int btrfs_quota_disable(struct btrfs_trans_handle *trans,
  64                         struct btrfs_fs_info *fs_info);
  65 int btrfs_qgroup_rescan(struct btrfs_fs_info *fs_info);
  66 void btrfs_qgroup_rescan_resume(struct btrfs_fs_info *fs_info);
  67 int btrfs_qgroup_wait_for_completion(struct btrfs_fs_info *fs_info);
  68 int btrfs_add_qgroup_relation(struct btrfs_trans_handle *trans,
  69                               struct btrfs_fs_info *fs_info, u64 src, u64 dst);
  70 int btrfs_del_qgroup_relation(struct btrfs_trans_handle *trans,
  71                               struct btrfs_fs_info *fs_info, u64 src, u64 dst);
  72 int btrfs_create_qgroup(struct btrfs_trans_handle *trans,
  73                         struct btrfs_fs_info *fs_info, u64 qgroupid);
  74 int btrfs_remove_qgroup(struct btrfs_trans_handle *trans,
  75                               struct btrfs_fs_info *fs_info, u64 qgroupid);
  76 int btrfs_limit_qgroup(struct btrfs_trans_handle *trans,
  77                        struct btrfs_fs_info *fs_info, u64 qgroupid,
  78                        struct btrfs_qgroup_limit *limit);
  79 int btrfs_read_qgroup_config(struct btrfs_fs_info *fs_info);
  80 void btrfs_free_qgroup_config(struct btrfs_fs_info *fs_info);
  81 struct btrfs_delayed_extent_op;
  82 int 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);
  87 int btrfs_delayed_qgroup_accounting(struct btrfs_trans_handle *trans,
  88                                     struct btrfs_fs_info *fs_info);
  89 void btrfs_remove_qgroup_operation(struct btrfs_trans_handle *trans,
  90                                    struct btrfs_fs_info *fs_info,
  91                                    struct btrfs_qgroup_operation *oper);
  92 int btrfs_run_qgroups(struct btrfs_trans_handle *trans,
  93                       struct btrfs_fs_info *fs_info);
  94 int 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);
  97 int btrfs_qgroup_reserve(struct btrfs_root *root, u64 num_bytes);
  98 void btrfs_qgroup_free(struct btrfs_root *root, u64 num_bytes);
  99
 100 void assert_qgroups_uptodate(struct btrfs_trans_handle *trans);
 101
 102 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
 103 int btrfs_verify_qgroup_counts(struct btrfs_fs_info *fs_info, u64 qgroupid,
 104                                u64 rfer, u64 excl);
 105 #endif
 106
 107 #endif /* __BTRFS_QGROUP__ */