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/*
* Copyright (C) 2014 Facebook. 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_QGROUP__
#define __BTRFS_QGROUP__
#include "ulist.h"
#include "delayed-ref.h"
/*
* A description of the operations, all of these operations only happen when we
* are adding the 1st reference for that subvolume in the case of adding space
* or on the last reference delete in the case of subtraction. The only
* exception is the last one, which is added for confusion.
*
* BTRFS_QGROUP_OPER_ADD_EXCL: adding bytes where this subvolume is the only
* one pointing at the bytes we are adding. This is called on the first
* allocation.
*
* BTRFS_QGROUP_OPER_ADD_SHARED: adding bytes where this bytenr is going to be
* shared between subvols. This is called on the creation of a ref that already
* has refs from a different subvolume, so basically reflink.
*
* BTRFS_QGROUP_OPER_SUB_EXCL: removing bytes where this subvolume is the only
* one referencing the range.
*
* BTRFS_QGROUP_OPER_SUB_SHARED: removing bytes where this subvolume shares with
* refs with other subvolumes.
*/
enum btrfs_qgroup_operation_type {
BTRFS_QGROUP_OPER_ADD_EXCL,
BTRFS_QGROUP_OPER_ADD_SHARED,
BTRFS_QGROUP_OPER_SUB_EXCL,
BTRFS_QGROUP_OPER_SUB_SHARED,
BTRFS_QGROUP_OPER_SUB_SUBTREE,
};
struct btrfs_qgroup_operation {
u64 ref_root;
u64 bytenr;
u64 num_bytes;
u64 seq;
enum btrfs_qgroup_operation_type type;
struct seq_list elem;
struct rb_node n;
struct list_head list;
};
/*
* Record a dirty extent, and info qgroup to update quota on it
* TODO: Use kmem cache to alloc it.
*/
struct btrfs_qgroup_extent_record {
struct rb_node node;
u64 bytenr;
u64 num_bytes;
struct ulist *old_roots;
};
int btrfs_quota_enable(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info);
int btrfs_quota_disable(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info);
int btrfs_qgroup_rescan(struct btrfs_fs_info *fs_info);
void btrfs_qgroup_rescan_resume(struct btrfs_fs_info *fs_info);
int btrfs_qgroup_wait_for_completion(struct btrfs_fs_info *fs_info);
int btrfs_add_qgroup_relation(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info, u64 src, u64 dst);
int btrfs_del_qgroup_relation(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info, u64 src, u64 dst);
int btrfs_create_qgroup(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info, u64 qgroupid);
int btrfs_remove_qgroup(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info, u64 qgroupid);
int btrfs_limit_qgroup(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info, u64 qgroupid,
struct btrfs_qgroup_limit *limit);
int btrfs_read_qgroup_config(struct btrfs_fs_info *fs_info);
void btrfs_free_qgroup_config(struct btrfs_fs_info *fs_info);
struct btrfs_delayed_extent_op;
int btrfs_qgroup_record_ref(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info, u64 ref_root,
u64 bytenr, u64 num_bytes,
enum btrfs_qgroup_operation_type type,
int mod_seq);
int btrfs_qgroup_prepare_account_extents(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info);
struct btrfs_qgroup_extent_record
*btrfs_qgroup_insert_dirty_extent(struct btrfs_delayed_ref_root *delayed_refs,
struct btrfs_qgroup_extent_record *record);
int btrfs_delayed_qgroup_accounting(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info);
void btrfs_remove_qgroup_operation(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct btrfs_qgroup_operation *oper);
int btrfs_run_qgroups(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info);
int btrfs_qgroup_inherit(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info, u64 srcid, u64 objectid,
struct btrfs_qgroup_inherit *inherit);
int btrfs_qgroup_reserve(struct btrfs_root *root, u64 num_bytes);
void btrfs_qgroup_free(struct btrfs_root *root, u64 num_bytes);
void assert_qgroups_uptodate(struct btrfs_trans_handle *trans);
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
int btrfs_verify_qgroup_counts(struct btrfs_fs_info *fs_info, u64 qgroupid,
u64 rfer, u64 excl);
#endif
#endif /* __BTRFS_QGROUP__ */
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