e2d1f92399
There are two problems in qgroup: a). The PAGE_CACHE is 4K, even when we are writing a data of 1K, qgroup will reserve a 4K size. It will cause the last 3K in a qgroup is not available to user. b). When user is writing a inline data, qgroup will not reserve it, it means this is a window we can exceed the limit of a qgroup. The main idea of this patch is reserving the data size of write_bytes rather than the reserve_bytes. It means qgroup will not care about the data size btrfs will reserve for user, but only care about the data size user is going to write. Then reserve it when user want to write and release it in transaction committed. In this way, qgroup can be released from the complex procedure in btrfs and only do the reserve when user want to write and account when the data is written in commit_transaction(). Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
107 lines
4.2 KiB
C
107 lines
4.2 KiB
C
/*
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* Copyright (C) 2014 Facebook. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#ifndef __BTRFS_QGROUP__
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#define __BTRFS_QGROUP__
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/*
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* A description of the operations, all of these operations only happen when we
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* are adding the 1st reference for that subvolume in the case of adding space
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* or on the last reference delete in the case of subtraction. The only
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* exception is the last one, which is added for confusion.
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*
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* BTRFS_QGROUP_OPER_ADD_EXCL: adding bytes where this subvolume is the only
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* one pointing at the bytes we are adding. This is called on the first
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* allocation.
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*
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* BTRFS_QGROUP_OPER_ADD_SHARED: adding bytes where this bytenr is going to be
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* shared between subvols. This is called on the creation of a ref that already
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* has refs from a different subvolume, so basically reflink.
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*
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* BTRFS_QGROUP_OPER_SUB_EXCL: removing bytes where this subvolume is the only
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* one referencing the range.
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*
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* BTRFS_QGROUP_OPER_SUB_SHARED: removing bytes where this subvolume shares with
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* refs with other subvolumes.
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*/
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enum btrfs_qgroup_operation_type {
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BTRFS_QGROUP_OPER_ADD_EXCL,
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BTRFS_QGROUP_OPER_ADD_SHARED,
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BTRFS_QGROUP_OPER_SUB_EXCL,
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BTRFS_QGROUP_OPER_SUB_SHARED,
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BTRFS_QGROUP_OPER_SUB_SUBTREE,
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};
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struct btrfs_qgroup_operation {
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u64 ref_root;
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u64 bytenr;
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u64 num_bytes;
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u64 seq;
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enum btrfs_qgroup_operation_type type;
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struct seq_list elem;
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struct rb_node n;
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struct list_head list;
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};
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int btrfs_quota_enable(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info);
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int btrfs_quota_disable(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info);
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int btrfs_qgroup_rescan(struct btrfs_fs_info *fs_info);
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void btrfs_qgroup_rescan_resume(struct btrfs_fs_info *fs_info);
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int btrfs_qgroup_wait_for_completion(struct btrfs_fs_info *fs_info);
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int btrfs_add_qgroup_relation(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info, u64 src, u64 dst);
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int btrfs_del_qgroup_relation(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info, u64 src, u64 dst);
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int btrfs_create_qgroup(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info, u64 qgroupid);
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int btrfs_remove_qgroup(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info, u64 qgroupid);
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int btrfs_limit_qgroup(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info, u64 qgroupid,
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struct btrfs_qgroup_limit *limit);
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int btrfs_read_qgroup_config(struct btrfs_fs_info *fs_info);
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void btrfs_free_qgroup_config(struct btrfs_fs_info *fs_info);
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struct btrfs_delayed_extent_op;
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int btrfs_qgroup_record_ref(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info, u64 ref_root,
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u64 bytenr, u64 num_bytes,
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enum btrfs_qgroup_operation_type type,
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int mod_seq);
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int btrfs_delayed_qgroup_accounting(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info);
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void btrfs_remove_qgroup_operation(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info,
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struct btrfs_qgroup_operation *oper);
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int btrfs_run_qgroups(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info);
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int btrfs_qgroup_inherit(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info, u64 srcid, u64 objectid,
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struct btrfs_qgroup_inherit *inherit);
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int btrfs_qgroup_reserve(struct btrfs_root *root, u64 num_bytes);
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void btrfs_qgroup_free(struct btrfs_root *root, u64 num_bytes);
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void assert_qgroups_uptodate(struct btrfs_trans_handle *trans);
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#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
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int btrfs_verify_qgroup_counts(struct btrfs_fs_info *fs_info, u64 qgroupid,
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u64 rfer, u64 excl);
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#endif
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#endif /* __BTRFS_QGROUP__ */
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