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Diffstat (limited to 'fs/btrfs/qgroup.h')
| -rw-r--r-- | fs/btrfs/qgroup.h | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/fs/btrfs/qgroup.h b/fs/btrfs/qgroup.h new file mode 100644 index 000000000000..5952ff1fbd7a --- /dev/null +++ b/fs/btrfs/qgroup.h @@ -0,0 +1,107 @@ +/* + * 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__ + +/* + * 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, +}; + +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; +}; + +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, + char *name); +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_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__ */ |