![Chris Mason](/assets/img/avatar_default.png)
This reverts commit 5986802c2f
.
Both paths are not error paths but regular cases where non-qgroup
subvols are involved.
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
1574 lines
37 KiB
C
1574 lines
37 KiB
C
/*
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* Copyright (C) 2011 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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#include <linux/sched.h>
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#include <linux/pagemap.h>
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#include <linux/writeback.h>
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#include <linux/blkdev.h>
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#include <linux/rbtree.h>
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#include <linux/slab.h>
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#include <linux/workqueue.h>
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#include "ctree.h"
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#include "transaction.h"
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#include "disk-io.h"
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#include "locking.h"
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#include "ulist.h"
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#include "ioctl.h"
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#include "backref.h"
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/* TODO XXX FIXME
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* - subvol delete -> delete when ref goes to 0? delete limits also?
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* - reorganize keys
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* - compressed
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* - sync
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* - rescan
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* - copy also limits on subvol creation
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* - limit
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* - caches fuer ulists
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* - performance benchmarks
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* - check all ioctl parameters
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*/
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/*
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* one struct for each qgroup, organized in fs_info->qgroup_tree.
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*/
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struct btrfs_qgroup {
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u64 qgroupid;
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/*
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* state
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*/
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u64 rfer; /* referenced */
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u64 rfer_cmpr; /* referenced compressed */
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u64 excl; /* exclusive */
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u64 excl_cmpr; /* exclusive compressed */
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/*
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* limits
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*/
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u64 lim_flags; /* which limits are set */
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u64 max_rfer;
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u64 max_excl;
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u64 rsv_rfer;
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u64 rsv_excl;
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/*
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* reservation tracking
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*/
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u64 reserved;
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/*
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* lists
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*/
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struct list_head groups; /* groups this group is member of */
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struct list_head members; /* groups that are members of this group */
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struct list_head dirty; /* dirty groups */
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struct rb_node node; /* tree of qgroups */
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/*
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* temp variables for accounting operations
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*/
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u64 tag;
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u64 refcnt;
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};
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/*
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* glue structure to represent the relations between qgroups.
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*/
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struct btrfs_qgroup_list {
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struct list_head next_group;
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struct list_head next_member;
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struct btrfs_qgroup *group;
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struct btrfs_qgroup *member;
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};
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/* must be called with qgroup_lock held */
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static struct btrfs_qgroup *find_qgroup_rb(struct btrfs_fs_info *fs_info,
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u64 qgroupid)
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{
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struct rb_node *n = fs_info->qgroup_tree.rb_node;
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struct btrfs_qgroup *qgroup;
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while (n) {
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qgroup = rb_entry(n, struct btrfs_qgroup, node);
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if (qgroup->qgroupid < qgroupid)
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n = n->rb_left;
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else if (qgroup->qgroupid > qgroupid)
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n = n->rb_right;
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else
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return qgroup;
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}
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return NULL;
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}
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/* must be called with qgroup_lock held */
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static struct btrfs_qgroup *add_qgroup_rb(struct btrfs_fs_info *fs_info,
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u64 qgroupid)
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{
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struct rb_node **p = &fs_info->qgroup_tree.rb_node;
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struct rb_node *parent = NULL;
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struct btrfs_qgroup *qgroup;
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while (*p) {
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parent = *p;
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qgroup = rb_entry(parent, struct btrfs_qgroup, node);
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if (qgroup->qgroupid < qgroupid)
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p = &(*p)->rb_left;
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else if (qgroup->qgroupid > qgroupid)
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p = &(*p)->rb_right;
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else
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return qgroup;
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}
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qgroup = kzalloc(sizeof(*qgroup), GFP_ATOMIC);
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if (!qgroup)
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return ERR_PTR(-ENOMEM);
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qgroup->qgroupid = qgroupid;
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INIT_LIST_HEAD(&qgroup->groups);
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INIT_LIST_HEAD(&qgroup->members);
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INIT_LIST_HEAD(&qgroup->dirty);
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rb_link_node(&qgroup->node, parent, p);
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rb_insert_color(&qgroup->node, &fs_info->qgroup_tree);
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return qgroup;
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}
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/* must be called with qgroup_lock held */
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static int del_qgroup_rb(struct btrfs_fs_info *fs_info, u64 qgroupid)
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{
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struct btrfs_qgroup *qgroup = find_qgroup_rb(fs_info, qgroupid);
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struct btrfs_qgroup_list *list;
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if (!qgroup)
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return -ENOENT;
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rb_erase(&qgroup->node, &fs_info->qgroup_tree);
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list_del(&qgroup->dirty);
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while (!list_empty(&qgroup->groups)) {
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list = list_first_entry(&qgroup->groups,
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struct btrfs_qgroup_list, next_group);
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list_del(&list->next_group);
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list_del(&list->next_member);
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kfree(list);
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}
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while (!list_empty(&qgroup->members)) {
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list = list_first_entry(&qgroup->members,
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struct btrfs_qgroup_list, next_member);
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list_del(&list->next_group);
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list_del(&list->next_member);
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kfree(list);
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}
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kfree(qgroup);
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return 0;
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}
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/* must be called with qgroup_lock held */
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static int add_relation_rb(struct btrfs_fs_info *fs_info,
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u64 memberid, u64 parentid)
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{
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struct btrfs_qgroup *member;
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struct btrfs_qgroup *parent;
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struct btrfs_qgroup_list *list;
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member = find_qgroup_rb(fs_info, memberid);
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parent = find_qgroup_rb(fs_info, parentid);
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if (!member || !parent)
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return -ENOENT;
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list = kzalloc(sizeof(*list), GFP_ATOMIC);
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if (!list)
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return -ENOMEM;
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list->group = parent;
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list->member = member;
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list_add_tail(&list->next_group, &member->groups);
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list_add_tail(&list->next_member, &parent->members);
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return 0;
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}
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/* must be called with qgroup_lock held */
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static int del_relation_rb(struct btrfs_fs_info *fs_info,
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u64 memberid, u64 parentid)
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{
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struct btrfs_qgroup *member;
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struct btrfs_qgroup *parent;
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struct btrfs_qgroup_list *list;
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member = find_qgroup_rb(fs_info, memberid);
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parent = find_qgroup_rb(fs_info, parentid);
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if (!member || !parent)
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return -ENOENT;
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list_for_each_entry(list, &member->groups, next_group) {
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if (list->group == parent) {
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list_del(&list->next_group);
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list_del(&list->next_member);
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kfree(list);
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return 0;
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}
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}
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return -ENOENT;
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}
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/*
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* The full config is read in one go, only called from open_ctree()
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* It doesn't use any locking, as at this point we're still single-threaded
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*/
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int btrfs_read_qgroup_config(struct btrfs_fs_info *fs_info)
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{
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struct btrfs_key key;
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struct btrfs_key found_key;
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struct btrfs_root *quota_root = fs_info->quota_root;
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struct btrfs_path *path = NULL;
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struct extent_buffer *l;
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int slot;
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int ret = 0;
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u64 flags = 0;
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if (!fs_info->quota_enabled)
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return 0;
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path = btrfs_alloc_path();
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if (!path) {
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ret = -ENOMEM;
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goto out;
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}
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/* default this to quota off, in case no status key is found */
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fs_info->qgroup_flags = 0;
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/*
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* pass 1: read status, all qgroup infos and limits
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*/
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key.objectid = 0;
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key.type = 0;
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key.offset = 0;
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ret = btrfs_search_slot_for_read(quota_root, &key, path, 1, 1);
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if (ret)
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goto out;
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while (1) {
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struct btrfs_qgroup *qgroup;
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slot = path->slots[0];
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l = path->nodes[0];
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btrfs_item_key_to_cpu(l, &found_key, slot);
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if (found_key.type == BTRFS_QGROUP_STATUS_KEY) {
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struct btrfs_qgroup_status_item *ptr;
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ptr = btrfs_item_ptr(l, slot,
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struct btrfs_qgroup_status_item);
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if (btrfs_qgroup_status_version(l, ptr) !=
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BTRFS_QGROUP_STATUS_VERSION) {
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printk(KERN_ERR
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"btrfs: old qgroup version, quota disabled\n");
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goto out;
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}
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if (btrfs_qgroup_status_generation(l, ptr) !=
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fs_info->generation) {
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flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
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printk(KERN_ERR
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"btrfs: qgroup generation mismatch, "
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"marked as inconsistent\n");
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}
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fs_info->qgroup_flags = btrfs_qgroup_status_flags(l,
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ptr);
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/* FIXME read scan element */
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goto next1;
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}
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if (found_key.type != BTRFS_QGROUP_INFO_KEY &&
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found_key.type != BTRFS_QGROUP_LIMIT_KEY)
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goto next1;
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qgroup = find_qgroup_rb(fs_info, found_key.offset);
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if ((qgroup && found_key.type == BTRFS_QGROUP_INFO_KEY) ||
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(!qgroup && found_key.type == BTRFS_QGROUP_LIMIT_KEY)) {
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printk(KERN_ERR "btrfs: inconsitent qgroup config\n");
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flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
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}
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if (!qgroup) {
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qgroup = add_qgroup_rb(fs_info, found_key.offset);
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if (IS_ERR(qgroup)) {
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ret = PTR_ERR(qgroup);
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goto out;
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}
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}
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switch (found_key.type) {
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case BTRFS_QGROUP_INFO_KEY: {
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struct btrfs_qgroup_info_item *ptr;
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ptr = btrfs_item_ptr(l, slot,
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struct btrfs_qgroup_info_item);
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qgroup->rfer = btrfs_qgroup_info_rfer(l, ptr);
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qgroup->rfer_cmpr = btrfs_qgroup_info_rfer_cmpr(l, ptr);
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qgroup->excl = btrfs_qgroup_info_excl(l, ptr);
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qgroup->excl_cmpr = btrfs_qgroup_info_excl_cmpr(l, ptr);
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/* generation currently unused */
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break;
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}
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case BTRFS_QGROUP_LIMIT_KEY: {
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struct btrfs_qgroup_limit_item *ptr;
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ptr = btrfs_item_ptr(l, slot,
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struct btrfs_qgroup_limit_item);
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qgroup->lim_flags = btrfs_qgroup_limit_flags(l, ptr);
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qgroup->max_rfer = btrfs_qgroup_limit_max_rfer(l, ptr);
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qgroup->max_excl = btrfs_qgroup_limit_max_excl(l, ptr);
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qgroup->rsv_rfer = btrfs_qgroup_limit_rsv_rfer(l, ptr);
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qgroup->rsv_excl = btrfs_qgroup_limit_rsv_excl(l, ptr);
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break;
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}
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}
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next1:
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ret = btrfs_next_item(quota_root, path);
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if (ret < 0)
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goto out;
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if (ret)
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break;
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}
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btrfs_release_path(path);
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/*
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* pass 2: read all qgroup relations
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*/
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key.objectid = 0;
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key.type = BTRFS_QGROUP_RELATION_KEY;
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key.offset = 0;
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ret = btrfs_search_slot_for_read(quota_root, &key, path, 1, 0);
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if (ret)
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goto out;
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while (1) {
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slot = path->slots[0];
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l = path->nodes[0];
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btrfs_item_key_to_cpu(l, &found_key, slot);
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if (found_key.type != BTRFS_QGROUP_RELATION_KEY)
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goto next2;
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if (found_key.objectid > found_key.offset) {
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/* parent <- member, not needed to build config */
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/* FIXME should we omit the key completely? */
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goto next2;
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}
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ret = add_relation_rb(fs_info, found_key.objectid,
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found_key.offset);
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if (ret)
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goto out;
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next2:
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ret = btrfs_next_item(quota_root, path);
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if (ret < 0)
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goto out;
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if (ret)
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break;
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}
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out:
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fs_info->qgroup_flags |= flags;
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if (!(fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_ON)) {
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fs_info->quota_enabled = 0;
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fs_info->pending_quota_state = 0;
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}
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btrfs_free_path(path);
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return ret < 0 ? ret : 0;
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}
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/*
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* This is only called from close_ctree() or open_ctree(), both in single-
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* treaded paths. Clean up the in-memory structures. No locking needed.
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*/
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void btrfs_free_qgroup_config(struct btrfs_fs_info *fs_info)
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{
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struct rb_node *n;
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struct btrfs_qgroup *qgroup;
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struct btrfs_qgroup_list *list;
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|
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while ((n = rb_first(&fs_info->qgroup_tree))) {
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qgroup = rb_entry(n, struct btrfs_qgroup, node);
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rb_erase(n, &fs_info->qgroup_tree);
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WARN_ON(!list_empty(&qgroup->dirty));
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|
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while (!list_empty(&qgroup->groups)) {
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list = list_first_entry(&qgroup->groups,
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struct btrfs_qgroup_list,
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next_group);
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list_del(&list->next_group);
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list_del(&list->next_member);
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kfree(list);
|
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}
|
|
|
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while (!list_empty(&qgroup->members)) {
|
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list = list_first_entry(&qgroup->members,
|
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struct btrfs_qgroup_list,
|
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next_member);
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list_del(&list->next_group);
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|
list_del(&list->next_member);
|
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kfree(list);
|
|
}
|
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kfree(qgroup);
|
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}
|
|
}
|
|
|
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static int add_qgroup_relation_item(struct btrfs_trans_handle *trans,
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struct btrfs_root *quota_root,
|
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u64 src, u64 dst)
|
|
{
|
|
int ret;
|
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struct btrfs_path *path;
|
|
struct btrfs_key key;
|
|
|
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path = btrfs_alloc_path();
|
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if (!path)
|
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return -ENOMEM;
|
|
|
|
key.objectid = src;
|
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key.type = BTRFS_QGROUP_RELATION_KEY;
|
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key.offset = dst;
|
|
|
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ret = btrfs_insert_empty_item(trans, quota_root, path, &key, 0);
|
|
|
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btrfs_mark_buffer_dirty(path->nodes[0]);
|
|
|
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btrfs_free_path(path);
|
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return ret;
|
|
}
|
|
|
|
static int del_qgroup_relation_item(struct btrfs_trans_handle *trans,
|
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struct btrfs_root *quota_root,
|
|
u64 src, u64 dst)
|
|
{
|
|
int ret;
|
|
struct btrfs_path *path;
|
|
struct btrfs_key key;
|
|
|
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path = btrfs_alloc_path();
|
|
if (!path)
|
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return -ENOMEM;
|
|
|
|
key.objectid = src;
|
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key.type = BTRFS_QGROUP_RELATION_KEY;
|
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key.offset = dst;
|
|
|
|
ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
if (ret > 0) {
|
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ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
ret = btrfs_del_item(trans, quota_root, path);
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static int add_qgroup_item(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *quota_root, u64 qgroupid)
|
|
{
|
|
int ret;
|
|
struct btrfs_path *path;
|
|
struct btrfs_qgroup_info_item *qgroup_info;
|
|
struct btrfs_qgroup_limit_item *qgroup_limit;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_key key;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
key.objectid = 0;
|
|
key.type = BTRFS_QGROUP_INFO_KEY;
|
|
key.offset = qgroupid;
|
|
|
|
ret = btrfs_insert_empty_item(trans, quota_root, path, &key,
|
|
sizeof(*qgroup_info));
|
|
if (ret)
|
|
goto out;
|
|
|
|
leaf = path->nodes[0];
|
|
qgroup_info = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_qgroup_info_item);
|
|
btrfs_set_qgroup_info_generation(leaf, qgroup_info, trans->transid);
|
|
btrfs_set_qgroup_info_rfer(leaf, qgroup_info, 0);
|
|
btrfs_set_qgroup_info_rfer_cmpr(leaf, qgroup_info, 0);
|
|
btrfs_set_qgroup_info_excl(leaf, qgroup_info, 0);
|
|
btrfs_set_qgroup_info_excl_cmpr(leaf, qgroup_info, 0);
|
|
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
|
|
btrfs_release_path(path);
|
|
|
|
key.type = BTRFS_QGROUP_LIMIT_KEY;
|
|
ret = btrfs_insert_empty_item(trans, quota_root, path, &key,
|
|
sizeof(*qgroup_limit));
|
|
if (ret)
|
|
goto out;
|
|
|
|
leaf = path->nodes[0];
|
|
qgroup_limit = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_qgroup_limit_item);
|
|
btrfs_set_qgroup_limit_flags(leaf, qgroup_limit, 0);
|
|
btrfs_set_qgroup_limit_max_rfer(leaf, qgroup_limit, 0);
|
|
btrfs_set_qgroup_limit_max_excl(leaf, qgroup_limit, 0);
|
|
btrfs_set_qgroup_limit_rsv_rfer(leaf, qgroup_limit, 0);
|
|
btrfs_set_qgroup_limit_rsv_excl(leaf, qgroup_limit, 0);
|
|
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
|
|
ret = 0;
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static int del_qgroup_item(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *quota_root, u64 qgroupid)
|
|
{
|
|
int ret;
|
|
struct btrfs_path *path;
|
|
struct btrfs_key key;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
key.objectid = 0;
|
|
key.type = BTRFS_QGROUP_INFO_KEY;
|
|
key.offset = qgroupid;
|
|
ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
if (ret > 0) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
ret = btrfs_del_item(trans, quota_root, path);
|
|
if (ret)
|
|
goto out;
|
|
|
|
btrfs_release_path(path);
|
|
|
|
key.type = BTRFS_QGROUP_LIMIT_KEY;
|
|
ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
if (ret > 0) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
ret = btrfs_del_item(trans, quota_root, path);
|
|
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static int update_qgroup_limit_item(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root, u64 qgroupid,
|
|
u64 flags, u64 max_rfer, u64 max_excl,
|
|
u64 rsv_rfer, u64 rsv_excl)
|
|
{
|
|
struct btrfs_path *path;
|
|
struct btrfs_key key;
|
|
struct extent_buffer *l;
|
|
struct btrfs_qgroup_limit_item *qgroup_limit;
|
|
int ret;
|
|
int slot;
|
|
|
|
key.objectid = 0;
|
|
key.type = BTRFS_QGROUP_LIMIT_KEY;
|
|
key.offset = qgroupid;
|
|
|
|
path = btrfs_alloc_path();
|
|
BUG_ON(!path);
|
|
ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
|
|
if (ret > 0)
|
|
ret = -ENOENT;
|
|
|
|
if (ret)
|
|
goto out;
|
|
|
|
l = path->nodes[0];
|
|
slot = path->slots[0];
|
|
qgroup_limit = btrfs_item_ptr(l, path->slots[0],
|
|
struct btrfs_qgroup_limit_item);
|
|
btrfs_set_qgroup_limit_flags(l, qgroup_limit, flags);
|
|
btrfs_set_qgroup_limit_max_rfer(l, qgroup_limit, max_rfer);
|
|
btrfs_set_qgroup_limit_max_excl(l, qgroup_limit, max_excl);
|
|
btrfs_set_qgroup_limit_rsv_rfer(l, qgroup_limit, rsv_rfer);
|
|
btrfs_set_qgroup_limit_rsv_excl(l, qgroup_limit, rsv_excl);
|
|
|
|
btrfs_mark_buffer_dirty(l);
|
|
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static int update_qgroup_info_item(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_qgroup *qgroup)
|
|
{
|
|
struct btrfs_path *path;
|
|
struct btrfs_key key;
|
|
struct extent_buffer *l;
|
|
struct btrfs_qgroup_info_item *qgroup_info;
|
|
int ret;
|
|
int slot;
|
|
|
|
key.objectid = 0;
|
|
key.type = BTRFS_QGROUP_INFO_KEY;
|
|
key.offset = qgroup->qgroupid;
|
|
|
|
path = btrfs_alloc_path();
|
|
BUG_ON(!path);
|
|
ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
|
|
if (ret > 0)
|
|
ret = -ENOENT;
|
|
|
|
if (ret)
|
|
goto out;
|
|
|
|
l = path->nodes[0];
|
|
slot = path->slots[0];
|
|
qgroup_info = btrfs_item_ptr(l, path->slots[0],
|
|
struct btrfs_qgroup_info_item);
|
|
btrfs_set_qgroup_info_generation(l, qgroup_info, trans->transid);
|
|
btrfs_set_qgroup_info_rfer(l, qgroup_info, qgroup->rfer);
|
|
btrfs_set_qgroup_info_rfer_cmpr(l, qgroup_info, qgroup->rfer_cmpr);
|
|
btrfs_set_qgroup_info_excl(l, qgroup_info, qgroup->excl);
|
|
btrfs_set_qgroup_info_excl_cmpr(l, qgroup_info, qgroup->excl_cmpr);
|
|
|
|
btrfs_mark_buffer_dirty(l);
|
|
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static int update_qgroup_status_item(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info,
|
|
struct btrfs_root *root)
|
|
{
|
|
struct btrfs_path *path;
|
|
struct btrfs_key key;
|
|
struct extent_buffer *l;
|
|
struct btrfs_qgroup_status_item *ptr;
|
|
int ret;
|
|
int slot;
|
|
|
|
key.objectid = 0;
|
|
key.type = BTRFS_QGROUP_STATUS_KEY;
|
|
key.offset = 0;
|
|
|
|
path = btrfs_alloc_path();
|
|
BUG_ON(!path);
|
|
ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
|
|
if (ret > 0)
|
|
ret = -ENOENT;
|
|
|
|
if (ret)
|
|
goto out;
|
|
|
|
l = path->nodes[0];
|
|
slot = path->slots[0];
|
|
ptr = btrfs_item_ptr(l, slot, struct btrfs_qgroup_status_item);
|
|
btrfs_set_qgroup_status_flags(l, ptr, fs_info->qgroup_flags);
|
|
btrfs_set_qgroup_status_generation(l, ptr, trans->transid);
|
|
/* XXX scan */
|
|
|
|
btrfs_mark_buffer_dirty(l);
|
|
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* called with qgroup_lock held
|
|
*/
|
|
static int btrfs_clean_quota_tree(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root)
|
|
{
|
|
struct btrfs_path *path;
|
|
struct btrfs_key key;
|
|
int ret;
|
|
|
|
if (!root)
|
|
return -EINVAL;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
while (1) {
|
|
key.objectid = 0;
|
|
key.offset = 0;
|
|
key.type = 0;
|
|
|
|
path->leave_spinning = 1;
|
|
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
|
|
if (ret > 0) {
|
|
if (path->slots[0] == 0)
|
|
break;
|
|
path->slots[0]--;
|
|
} else if (ret < 0) {
|
|
break;
|
|
}
|
|
|
|
ret = btrfs_del_item(trans, root, path);
|
|
if (ret)
|
|
goto out;
|
|
btrfs_release_path(path);
|
|
}
|
|
ret = 0;
|
|
out:
|
|
root->fs_info->pending_quota_state = 0;
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_quota_enable(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_root *quota_root;
|
|
struct btrfs_path *path = NULL;
|
|
struct btrfs_qgroup_status_item *ptr;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_key key;
|
|
int ret = 0;
|
|
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
if (fs_info->quota_root) {
|
|
fs_info->pending_quota_state = 1;
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
goto out;
|
|
}
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
|
|
/*
|
|
* initially create the quota tree
|
|
*/
|
|
quota_root = btrfs_create_tree(trans, fs_info,
|
|
BTRFS_QUOTA_TREE_OBJECTID);
|
|
if (IS_ERR(quota_root)) {
|
|
ret = PTR_ERR(quota_root);
|
|
goto out;
|
|
}
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
key.objectid = 0;
|
|
key.type = BTRFS_QGROUP_STATUS_KEY;
|
|
key.offset = 0;
|
|
|
|
ret = btrfs_insert_empty_item(trans, quota_root, path, &key,
|
|
sizeof(*ptr));
|
|
if (ret)
|
|
goto out;
|
|
|
|
leaf = path->nodes[0];
|
|
ptr = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_qgroup_status_item);
|
|
btrfs_set_qgroup_status_generation(leaf, ptr, trans->transid);
|
|
btrfs_set_qgroup_status_version(leaf, ptr, BTRFS_QGROUP_STATUS_VERSION);
|
|
fs_info->qgroup_flags = BTRFS_QGROUP_STATUS_FLAG_ON |
|
|
BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
|
|
btrfs_set_qgroup_status_flags(leaf, ptr, fs_info->qgroup_flags);
|
|
btrfs_set_qgroup_status_scan(leaf, ptr, 0);
|
|
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
fs_info->quota_root = quota_root;
|
|
fs_info->pending_quota_state = 1;
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_quota_disable(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_root *tree_root = fs_info->tree_root;
|
|
struct btrfs_root *quota_root;
|
|
int ret = 0;
|
|
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
fs_info->quota_enabled = 0;
|
|
fs_info->pending_quota_state = 0;
|
|
quota_root = fs_info->quota_root;
|
|
fs_info->quota_root = NULL;
|
|
btrfs_free_qgroup_config(fs_info);
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
|
|
if (!quota_root)
|
|
return -EINVAL;
|
|
|
|
ret = btrfs_clean_quota_tree(trans, quota_root);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = btrfs_del_root(trans, tree_root, "a_root->root_key);
|
|
if (ret)
|
|
goto out;
|
|
|
|
list_del("a_root->dirty_list);
|
|
|
|
btrfs_tree_lock(quota_root->node);
|
|
clean_tree_block(trans, tree_root, quota_root->node);
|
|
btrfs_tree_unlock(quota_root->node);
|
|
btrfs_free_tree_block(trans, quota_root, quota_root->node, 0, 1);
|
|
|
|
free_extent_buffer(quota_root->node);
|
|
free_extent_buffer(quota_root->commit_root);
|
|
kfree(quota_root);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_quota_rescan(struct btrfs_fs_info *fs_info)
|
|
{
|
|
/* FIXME */
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_add_qgroup_relation(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info, u64 src, u64 dst)
|
|
{
|
|
struct btrfs_root *quota_root;
|
|
int ret = 0;
|
|
|
|
quota_root = fs_info->quota_root;
|
|
if (!quota_root)
|
|
return -EINVAL;
|
|
|
|
ret = add_qgroup_relation_item(trans, quota_root, src, dst);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = add_qgroup_relation_item(trans, quota_root, dst, src);
|
|
if (ret) {
|
|
del_qgroup_relation_item(trans, quota_root, src, dst);
|
|
return ret;
|
|
}
|
|
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
ret = add_relation_rb(quota_root->fs_info, src, dst);
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_del_qgroup_relation(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info, u64 src, u64 dst)
|
|
{
|
|
struct btrfs_root *quota_root;
|
|
int ret = 0;
|
|
int err;
|
|
|
|
quota_root = fs_info->quota_root;
|
|
if (!quota_root)
|
|
return -EINVAL;
|
|
|
|
ret = del_qgroup_relation_item(trans, quota_root, src, dst);
|
|
err = del_qgroup_relation_item(trans, quota_root, dst, src);
|
|
if (err && !ret)
|
|
ret = err;
|
|
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
del_relation_rb(fs_info, src, dst);
|
|
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_create_qgroup(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info, u64 qgroupid, char *name)
|
|
{
|
|
struct btrfs_root *quota_root;
|
|
struct btrfs_qgroup *qgroup;
|
|
int ret = 0;
|
|
|
|
quota_root = fs_info->quota_root;
|
|
if (!quota_root)
|
|
return -EINVAL;
|
|
|
|
ret = add_qgroup_item(trans, quota_root, qgroupid);
|
|
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
qgroup = add_qgroup_rb(fs_info, qgroupid);
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
|
|
if (IS_ERR(qgroup))
|
|
ret = PTR_ERR(qgroup);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_remove_qgroup(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info, u64 qgroupid)
|
|
{
|
|
struct btrfs_root *quota_root;
|
|
int ret = 0;
|
|
|
|
quota_root = fs_info->quota_root;
|
|
if (!quota_root)
|
|
return -EINVAL;
|
|
|
|
ret = del_qgroup_item(trans, quota_root, qgroupid);
|
|
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
del_qgroup_rb(quota_root->fs_info, qgroupid);
|
|
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_limit_qgroup(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info, u64 qgroupid,
|
|
struct btrfs_qgroup_limit *limit)
|
|
{
|
|
struct btrfs_root *quota_root = fs_info->quota_root;
|
|
struct btrfs_qgroup *qgroup;
|
|
int ret = 0;
|
|
|
|
if (!quota_root)
|
|
return -EINVAL;
|
|
|
|
ret = update_qgroup_limit_item(trans, quota_root, qgroupid,
|
|
limit->flags, limit->max_rfer,
|
|
limit->max_excl, limit->rsv_rfer,
|
|
limit->rsv_excl);
|
|
if (ret) {
|
|
fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
|
|
printk(KERN_INFO "unable to update quota limit for %llu\n",
|
|
(unsigned long long)qgroupid);
|
|
}
|
|
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
|
|
qgroup = find_qgroup_rb(fs_info, qgroupid);
|
|
if (!qgroup) {
|
|
ret = -ENOENT;
|
|
goto unlock;
|
|
}
|
|
qgroup->lim_flags = limit->flags;
|
|
qgroup->max_rfer = limit->max_rfer;
|
|
qgroup->max_excl = limit->max_excl;
|
|
qgroup->rsv_rfer = limit->rsv_rfer;
|
|
qgroup->rsv_excl = limit->rsv_excl;
|
|
|
|
unlock:
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void qgroup_dirty(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_qgroup *qgroup)
|
|
{
|
|
if (list_empty(&qgroup->dirty))
|
|
list_add(&qgroup->dirty, &fs_info->dirty_qgroups);
|
|
}
|
|
|
|
/*
|
|
* btrfs_qgroup_record_ref is called when the ref is added or deleted. it puts
|
|
* the modification into a list that's later used by btrfs_end_transaction to
|
|
* pass the recorded modifications on to btrfs_qgroup_account_ref.
|
|
*/
|
|
int btrfs_qgroup_record_ref(struct btrfs_trans_handle *trans,
|
|
struct btrfs_delayed_ref_node *node,
|
|
struct btrfs_delayed_extent_op *extent_op)
|
|
{
|
|
struct qgroup_update *u;
|
|
|
|
BUG_ON(!trans->delayed_ref_elem.seq);
|
|
u = kmalloc(sizeof(*u), GFP_NOFS);
|
|
if (!u)
|
|
return -ENOMEM;
|
|
|
|
u->node = node;
|
|
u->extent_op = extent_op;
|
|
list_add_tail(&u->list, &trans->qgroup_ref_list);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* btrfs_qgroup_account_ref is called for every ref that is added to or deleted
|
|
* from the fs. First, all roots referencing the extent are searched, and
|
|
* then the space is accounted accordingly to the different roots. The
|
|
* accounting algorithm works in 3 steps documented inline.
|
|
*/
|
|
int btrfs_qgroup_account_ref(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info,
|
|
struct btrfs_delayed_ref_node *node,
|
|
struct btrfs_delayed_extent_op *extent_op)
|
|
{
|
|
struct btrfs_key ins;
|
|
struct btrfs_root *quota_root;
|
|
u64 ref_root;
|
|
struct btrfs_qgroup *qgroup;
|
|
struct ulist_node *unode;
|
|
struct ulist *roots = NULL;
|
|
struct ulist *tmp = NULL;
|
|
struct ulist_iterator uiter;
|
|
u64 seq;
|
|
int ret = 0;
|
|
int sgn;
|
|
|
|
if (!fs_info->quota_enabled)
|
|
return 0;
|
|
|
|
BUG_ON(!fs_info->quota_root);
|
|
|
|
ins.objectid = node->bytenr;
|
|
ins.offset = node->num_bytes;
|
|
ins.type = BTRFS_EXTENT_ITEM_KEY;
|
|
|
|
if (node->type == BTRFS_TREE_BLOCK_REF_KEY ||
|
|
node->type == BTRFS_SHARED_BLOCK_REF_KEY) {
|
|
struct btrfs_delayed_tree_ref *ref;
|
|
ref = btrfs_delayed_node_to_tree_ref(node);
|
|
ref_root = ref->root;
|
|
} else if (node->type == BTRFS_EXTENT_DATA_REF_KEY ||
|
|
node->type == BTRFS_SHARED_DATA_REF_KEY) {
|
|
struct btrfs_delayed_data_ref *ref;
|
|
ref = btrfs_delayed_node_to_data_ref(node);
|
|
ref_root = ref->root;
|
|
} else {
|
|
BUG();
|
|
}
|
|
|
|
if (!is_fstree(ref_root)) {
|
|
/*
|
|
* non-fs-trees are not being accounted
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
switch (node->action) {
|
|
case BTRFS_ADD_DELAYED_REF:
|
|
case BTRFS_ADD_DELAYED_EXTENT:
|
|
sgn = 1;
|
|
break;
|
|
case BTRFS_DROP_DELAYED_REF:
|
|
sgn = -1;
|
|
break;
|
|
case BTRFS_UPDATE_DELAYED_HEAD:
|
|
return 0;
|
|
default:
|
|
BUG();
|
|
}
|
|
|
|
/*
|
|
* the delayed ref sequence number we pass depends on the direction of
|
|
* the operation. for add operations, we pass (node->seq - 1) to skip
|
|
* the delayed ref's current sequence number, because we need the state
|
|
* of the tree before the add operation. for delete operations, we pass
|
|
* (node->seq) to include the delayed ref's current sequence number,
|
|
* because we need the state of the tree after the delete operation.
|
|
*/
|
|
ret = btrfs_find_all_roots(trans, fs_info, node->bytenr,
|
|
sgn > 0 ? node->seq - 1 : node->seq, &roots);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
quota_root = fs_info->quota_root;
|
|
if (!quota_root)
|
|
goto unlock;
|
|
|
|
qgroup = find_qgroup_rb(fs_info, ref_root);
|
|
if (!qgroup)
|
|
goto unlock;
|
|
|
|
/*
|
|
* step 1: for each old ref, visit all nodes once and inc refcnt
|
|
*/
|
|
tmp = ulist_alloc(GFP_ATOMIC);
|
|
if (!tmp) {
|
|
ret = -ENOMEM;
|
|
goto unlock;
|
|
}
|
|
seq = fs_info->qgroup_seq;
|
|
fs_info->qgroup_seq += roots->nnodes + 1; /* max refcnt */
|
|
|
|
ULIST_ITER_INIT(&uiter);
|
|
while ((unode = ulist_next(roots, &uiter))) {
|
|
struct ulist_node *tmp_unode;
|
|
struct ulist_iterator tmp_uiter;
|
|
struct btrfs_qgroup *qg;
|
|
|
|
qg = find_qgroup_rb(fs_info, unode->val);
|
|
if (!qg)
|
|
continue;
|
|
|
|
ulist_reinit(tmp);
|
|
/* XXX id not needed */
|
|
ulist_add(tmp, qg->qgroupid, (unsigned long)qg, GFP_ATOMIC);
|
|
ULIST_ITER_INIT(&tmp_uiter);
|
|
while ((tmp_unode = ulist_next(tmp, &tmp_uiter))) {
|
|
struct btrfs_qgroup_list *glist;
|
|
|
|
qg = (struct btrfs_qgroup *)tmp_unode->aux;
|
|
if (qg->refcnt < seq)
|
|
qg->refcnt = seq + 1;
|
|
else
|
|
++qg->refcnt;
|
|
|
|
list_for_each_entry(glist, &qg->groups, next_group) {
|
|
ulist_add(tmp, glist->group->qgroupid,
|
|
(unsigned long)glist->group,
|
|
GFP_ATOMIC);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* step 2: walk from the new root
|
|
*/
|
|
ulist_reinit(tmp);
|
|
ulist_add(tmp, qgroup->qgroupid, (unsigned long)qgroup, GFP_ATOMIC);
|
|
ULIST_ITER_INIT(&uiter);
|
|
while ((unode = ulist_next(tmp, &uiter))) {
|
|
struct btrfs_qgroup *qg;
|
|
struct btrfs_qgroup_list *glist;
|
|
|
|
qg = (struct btrfs_qgroup *)unode->aux;
|
|
if (qg->refcnt < seq) {
|
|
/* not visited by step 1 */
|
|
qg->rfer += sgn * node->num_bytes;
|
|
qg->rfer_cmpr += sgn * node->num_bytes;
|
|
if (roots->nnodes == 0) {
|
|
qg->excl += sgn * node->num_bytes;
|
|
qg->excl_cmpr += sgn * node->num_bytes;
|
|
}
|
|
qgroup_dirty(fs_info, qg);
|
|
}
|
|
WARN_ON(qg->tag >= seq);
|
|
qg->tag = seq;
|
|
|
|
list_for_each_entry(glist, &qg->groups, next_group) {
|
|
ulist_add(tmp, glist->group->qgroupid,
|
|
(unsigned long)glist->group, GFP_ATOMIC);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* step 3: walk again from old refs
|
|
*/
|
|
ULIST_ITER_INIT(&uiter);
|
|
while ((unode = ulist_next(roots, &uiter))) {
|
|
struct btrfs_qgroup *qg;
|
|
struct ulist_node *tmp_unode;
|
|
struct ulist_iterator tmp_uiter;
|
|
|
|
qg = find_qgroup_rb(fs_info, unode->val);
|
|
if (!qg)
|
|
continue;
|
|
|
|
ulist_reinit(tmp);
|
|
ulist_add(tmp, qg->qgroupid, (unsigned long)qg, GFP_ATOMIC);
|
|
ULIST_ITER_INIT(&tmp_uiter);
|
|
while ((tmp_unode = ulist_next(tmp, &tmp_uiter))) {
|
|
struct btrfs_qgroup_list *glist;
|
|
|
|
qg = (struct btrfs_qgroup *)tmp_unode->aux;
|
|
if (qg->tag == seq)
|
|
continue;
|
|
|
|
if (qg->refcnt - seq == roots->nnodes) {
|
|
qg->excl -= sgn * node->num_bytes;
|
|
qg->excl_cmpr -= sgn * node->num_bytes;
|
|
qgroup_dirty(fs_info, qg);
|
|
}
|
|
|
|
list_for_each_entry(glist, &qg->groups, next_group) {
|
|
ulist_add(tmp, glist->group->qgroupid,
|
|
(unsigned long)glist->group,
|
|
GFP_ATOMIC);
|
|
}
|
|
}
|
|
}
|
|
ret = 0;
|
|
unlock:
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
out:
|
|
ulist_free(roots);
|
|
ulist_free(tmp);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* called from commit_transaction. Writes all changed qgroups to disk.
|
|
*/
|
|
int btrfs_run_qgroups(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_root *quota_root = fs_info->quota_root;
|
|
int ret = 0;
|
|
|
|
if (!quota_root)
|
|
goto out;
|
|
|
|
fs_info->quota_enabled = fs_info->pending_quota_state;
|
|
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
while (!list_empty(&fs_info->dirty_qgroups)) {
|
|
struct btrfs_qgroup *qgroup;
|
|
qgroup = list_first_entry(&fs_info->dirty_qgroups,
|
|
struct btrfs_qgroup, dirty);
|
|
list_del_init(&qgroup->dirty);
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
ret = update_qgroup_info_item(trans, quota_root, qgroup);
|
|
if (ret)
|
|
fs_info->qgroup_flags |=
|
|
BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
}
|
|
if (fs_info->quota_enabled)
|
|
fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_ON;
|
|
else
|
|
fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_ON;
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
|
|
ret = update_qgroup_status_item(trans, fs_info, quota_root);
|
|
if (ret)
|
|
fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
|
|
|
|
out:
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* copy the acounting information between qgroups. This is necessary when a
|
|
* snapshot or a subvolume is created
|
|
*/
|
|
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 ret = 0;
|
|
int i;
|
|
u64 *i_qgroups;
|
|
struct btrfs_root *quota_root = fs_info->quota_root;
|
|
struct btrfs_qgroup *srcgroup;
|
|
struct btrfs_qgroup *dstgroup;
|
|
u32 level_size = 0;
|
|
|
|
if (!fs_info->quota_enabled)
|
|
return 0;
|
|
|
|
if (!quota_root)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* create a tracking group for the subvol itself
|
|
*/
|
|
ret = add_qgroup_item(trans, quota_root, objectid);
|
|
if (ret)
|
|
goto out;
|
|
|
|
if (inherit && inherit->flags & BTRFS_QGROUP_INHERIT_SET_LIMITS) {
|
|
ret = update_qgroup_limit_item(trans, quota_root, objectid,
|
|
inherit->lim.flags,
|
|
inherit->lim.max_rfer,
|
|
inherit->lim.max_excl,
|
|
inherit->lim.rsv_rfer,
|
|
inherit->lim.rsv_excl);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
if (srcid) {
|
|
struct btrfs_root *srcroot;
|
|
struct btrfs_key srckey;
|
|
int srcroot_level;
|
|
|
|
srckey.objectid = srcid;
|
|
srckey.type = BTRFS_ROOT_ITEM_KEY;
|
|
srckey.offset = (u64)-1;
|
|
srcroot = btrfs_read_fs_root_no_name(fs_info, &srckey);
|
|
if (IS_ERR(srcroot)) {
|
|
ret = PTR_ERR(srcroot);
|
|
goto out;
|
|
}
|
|
|
|
rcu_read_lock();
|
|
srcroot_level = btrfs_header_level(srcroot->node);
|
|
level_size = btrfs_level_size(srcroot, srcroot_level);
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
/*
|
|
* add qgroup to all inherited groups
|
|
*/
|
|
if (inherit) {
|
|
i_qgroups = (u64 *)(inherit + 1);
|
|
for (i = 0; i < inherit->num_qgroups; ++i) {
|
|
ret = add_qgroup_relation_item(trans, quota_root,
|
|
objectid, *i_qgroups);
|
|
if (ret)
|
|
goto out;
|
|
ret = add_qgroup_relation_item(trans, quota_root,
|
|
*i_qgroups, objectid);
|
|
if (ret)
|
|
goto out;
|
|
++i_qgroups;
|
|
}
|
|
}
|
|
|
|
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
|
|
dstgroup = add_qgroup_rb(fs_info, objectid);
|
|
if (IS_ERR(dstgroup)) {
|
|
ret = PTR_ERR(dstgroup);
|
|
goto unlock;
|
|
}
|
|
|
|
if (srcid) {
|
|
srcgroup = find_qgroup_rb(fs_info, srcid);
|
|
if (!srcgroup)
|
|
goto unlock;
|
|
dstgroup->rfer = srcgroup->rfer - level_size;
|
|
dstgroup->rfer_cmpr = srcgroup->rfer_cmpr - level_size;
|
|
srcgroup->excl = level_size;
|
|
srcgroup->excl_cmpr = level_size;
|
|
qgroup_dirty(fs_info, dstgroup);
|
|
qgroup_dirty(fs_info, srcgroup);
|
|
}
|
|
|
|
if (!inherit)
|
|
goto unlock;
|
|
|
|
i_qgroups = (u64 *)(inherit + 1);
|
|
for (i = 0; i < inherit->num_qgroups; ++i) {
|
|
ret = add_relation_rb(quota_root->fs_info, objectid,
|
|
*i_qgroups);
|
|
if (ret)
|
|
goto unlock;
|
|
++i_qgroups;
|
|
}
|
|
|
|
for (i = 0; i < inherit->num_ref_copies; ++i) {
|
|
struct btrfs_qgroup *src;
|
|
struct btrfs_qgroup *dst;
|
|
|
|
src = find_qgroup_rb(fs_info, i_qgroups[0]);
|
|
dst = find_qgroup_rb(fs_info, i_qgroups[1]);
|
|
|
|
if (!src || !dst) {
|
|
ret = -EINVAL;
|
|
goto unlock;
|
|
}
|
|
|
|
dst->rfer = src->rfer - level_size;
|
|
dst->rfer_cmpr = src->rfer_cmpr - level_size;
|
|
i_qgroups += 2;
|
|
}
|
|
for (i = 0; i < inherit->num_excl_copies; ++i) {
|
|
struct btrfs_qgroup *src;
|
|
struct btrfs_qgroup *dst;
|
|
|
|
src = find_qgroup_rb(fs_info, i_qgroups[0]);
|
|
dst = find_qgroup_rb(fs_info, i_qgroups[1]);
|
|
|
|
if (!src || !dst) {
|
|
ret = -EINVAL;
|
|
goto unlock;
|
|
}
|
|
|
|
dst->excl = src->excl + level_size;
|
|
dst->excl_cmpr = src->excl_cmpr + level_size;
|
|
i_qgroups += 2;
|
|
}
|
|
|
|
unlock:
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* reserve some space for a qgroup and all its parents. The reservation takes
|
|
* place with start_transaction or dealloc_reserve, similar to ENOSPC
|
|
* accounting. If not enough space is available, EDQUOT is returned.
|
|
* We assume that the requested space is new for all qgroups.
|
|
*/
|
|
int btrfs_qgroup_reserve(struct btrfs_root *root, u64 num_bytes)
|
|
{
|
|
struct btrfs_root *quota_root;
|
|
struct btrfs_qgroup *qgroup;
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
u64 ref_root = root->root_key.objectid;
|
|
int ret = 0;
|
|
struct ulist *ulist = NULL;
|
|
struct ulist_node *unode;
|
|
struct ulist_iterator uiter;
|
|
|
|
if (!is_fstree(ref_root))
|
|
return 0;
|
|
|
|
if (num_bytes == 0)
|
|
return 0;
|
|
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
quota_root = fs_info->quota_root;
|
|
if (!quota_root)
|
|
goto out;
|
|
|
|
qgroup = find_qgroup_rb(fs_info, ref_root);
|
|
if (!qgroup)
|
|
goto out;
|
|
|
|
/*
|
|
* in a first step, we check all affected qgroups if any limits would
|
|
* be exceeded
|
|
*/
|
|
ulist = ulist_alloc(GFP_ATOMIC);
|
|
ulist_add(ulist, qgroup->qgroupid, (unsigned long)qgroup, GFP_ATOMIC);
|
|
ULIST_ITER_INIT(&uiter);
|
|
while ((unode = ulist_next(ulist, &uiter))) {
|
|
struct btrfs_qgroup *qg;
|
|
struct btrfs_qgroup_list *glist;
|
|
|
|
qg = (struct btrfs_qgroup *)unode->aux;
|
|
|
|
if ((qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_RFER) &&
|
|
qg->reserved + qg->rfer + num_bytes >
|
|
qg->max_rfer)
|
|
ret = -EDQUOT;
|
|
|
|
if ((qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_EXCL) &&
|
|
qg->reserved + qg->excl + num_bytes >
|
|
qg->max_excl)
|
|
ret = -EDQUOT;
|
|
|
|
list_for_each_entry(glist, &qg->groups, next_group) {
|
|
ulist_add(ulist, glist->group->qgroupid,
|
|
(unsigned long)glist->group, GFP_ATOMIC);
|
|
}
|
|
}
|
|
if (ret)
|
|
goto out;
|
|
|
|
/*
|
|
* no limits exceeded, now record the reservation into all qgroups
|
|
*/
|
|
ULIST_ITER_INIT(&uiter);
|
|
while ((unode = ulist_next(ulist, &uiter))) {
|
|
struct btrfs_qgroup *qg;
|
|
|
|
qg = (struct btrfs_qgroup *)unode->aux;
|
|
|
|
qg->reserved += num_bytes;
|
|
}
|
|
|
|
out:
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
ulist_free(ulist);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void btrfs_qgroup_free(struct btrfs_root *root, u64 num_bytes)
|
|
{
|
|
struct btrfs_root *quota_root;
|
|
struct btrfs_qgroup *qgroup;
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct ulist *ulist = NULL;
|
|
struct ulist_node *unode;
|
|
struct ulist_iterator uiter;
|
|
u64 ref_root = root->root_key.objectid;
|
|
|
|
if (!is_fstree(ref_root))
|
|
return;
|
|
|
|
if (num_bytes == 0)
|
|
return;
|
|
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
|
|
quota_root = fs_info->quota_root;
|
|
if (!quota_root)
|
|
goto out;
|
|
|
|
qgroup = find_qgroup_rb(fs_info, ref_root);
|
|
if (!qgroup)
|
|
goto out;
|
|
|
|
ulist = ulist_alloc(GFP_ATOMIC);
|
|
ulist_add(ulist, qgroup->qgroupid, (unsigned long)qgroup, GFP_ATOMIC);
|
|
ULIST_ITER_INIT(&uiter);
|
|
while ((unode = ulist_next(ulist, &uiter))) {
|
|
struct btrfs_qgroup *qg;
|
|
struct btrfs_qgroup_list *glist;
|
|
|
|
qg = (struct btrfs_qgroup *)unode->aux;
|
|
|
|
qg->reserved -= num_bytes;
|
|
|
|
list_for_each_entry(glist, &qg->groups, next_group) {
|
|
ulist_add(ulist, glist->group->qgroupid,
|
|
(unsigned long)glist->group, GFP_ATOMIC);
|
|
}
|
|
}
|
|
|
|
out:
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
ulist_free(ulist);
|
|
}
|
|
|
|
void assert_qgroups_uptodate(struct btrfs_trans_handle *trans)
|
|
{
|
|
if (list_empty(&trans->qgroup_ref_list) && !trans->delayed_ref_elem.seq)
|
|
return;
|
|
printk(KERN_ERR "btrfs: qgroups not uptodate in trans handle %p: list is%s empty, seq is %llu\n",
|
|
trans, list_empty(&trans->qgroup_ref_list) ? "" : " not",
|
|
trans->delayed_ref_elem.seq);
|
|
BUG();
|
|
}
|