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1152651a08
During its tree walk, btrfs_drop_snapshot() will skip any shared subtrees it encounters. This is incorrect when we have qgroups turned on as those subtrees need to have their contents accounted. In particular, the case we're concerned with is when removing our snapshot root leaves the subtree with only one root reference. In those cases we need to find the last remaining root and add each extent in the subtree to the corresponding qgroup exclusive counts. This patch implements the shared subtree walk and a new qgroup operation, BTRFS_QGROUP_OPER_SUB_SUBTREE. When an operation of this type is encountered during qgroup accounting, we search for any root references to that extent and in the case that we find only one reference left, we go ahead and do the math on it's exclusive counts. Signed-off-by: Mark Fasheh <mfasheh@suse.de> Reviewed-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Chris Mason <clm@fb.com>
109 lines
4.3 KiB
C
109 lines
4.3 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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char *name);
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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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