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https://github.com/kdave/btrfs-progs
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1e174d2621
The current show_qgroups() just shows a little information, and it is hard to
add some functions which the users need in the future, so i restructure it, make
it easy to add new functions.
In order to improve the scalability of show_qgroups(), i add some important
structures:
struct qgroup_lookup {
struct rb_root root;
}
/*
*store qgroup's information
*/
struct btrfs_qgroup {
struct rb_node rb_node;
u64 qgroupid;
u64 generation;
u64 rfer;
u64 rfer_cmpr;
u64 excl_cmpr;
u64 flags;
u64 max_rfer;
u64 max_excl;
u64 rsv_rfer;
u64 rsv_excl;
struct list_head qgroups;
struct list_head members;
}
/*
*glue structure to represent the relations
*between qgroups
*/
struct btrfs_qgroup_list {
struct list_head next_qgroups;
struct list_head next_member;
struct btrfs_qgroup *qgroup;
struct btrfs_qgroup *member;
}
The above 3 structures are used to manage all the information
of qgroups.
struct {
char *name;
char *column_name;
int need_print;
} btrfs_qgroup_columns[]
We define a arrary to manage all the columns that can be
outputed, and use a member variant(->need_print) to control
the output of the relative column. Some columns are outputed
by default. But we can change it according to the requirement
of the users.
For example:
if outputing max referenced size of qgroup is needed,the function
'btrfs_qgroup_setup_column()' will be called, and the parameter 'BTRFS_QGROUP_MAX_RFER'
(extend in the future) will be passsed to the function. After the function is done,
when showing qgroups, max referenced size of qgroup will be output.
Signed-off-by: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
42 lines
1.3 KiB
C
42 lines
1.3 KiB
C
/*
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* Copyright (C) 2012 STRATO. 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_H
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#define _BTRFS_QGROUP_H
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#include "ioctl.h"
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#include "kerncompat.h"
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enum btrfs_qgroup_column_enum {
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BTRFS_QGROUP_QGROUPID,
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BTRFS_QGROUP_RFER,
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BTRFS_QGROUP_EXCL,
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BTRFS_QGROUP_ALL,
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};
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int btrfs_show_qgroups(int fd);
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void btrfs_qgroup_setup_print_column(enum btrfs_qgroup_column_enum column);
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u64 parse_qgroupid(char *p);
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int qgroup_inherit_size(struct btrfs_qgroup_inherit *p);
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int qgroup_inherit_add_group(struct btrfs_qgroup_inherit **inherit, char *arg);
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int qgroup_inherit_add_copy(struct btrfs_qgroup_inherit **inherit, char *arg,
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int type);
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#endif
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