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![Yang Dongsheng](/assets/img/avatar_default.png)
In function qgroup_excl_accounting(), we need to WARN when qg->excl is less than what we want to free, same to child and parents. But currently, for parent qgroup, the WARN_ON() is located after freeing qg->excl. It will WARN out even we free it normally. This patch move this WARN_ON() before freeing qg->excl. Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com> Reviewed-by: Satoru Takeuchi <takeuchi_satoru@jp.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
2826 lines
71 KiB
C
2826 lines
71 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 <linux/btrfs.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 "backref.h"
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#include "extent_io.h"
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#include "qgroup.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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* - 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 old_refcnt;
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u64 new_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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#define ptr_to_u64(x) ((u64)(uintptr_t)x)
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#define u64_to_ptr(x) ((struct btrfs_qgroup *)(uintptr_t)x)
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static int
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qgroup_rescan_init(struct btrfs_fs_info *fs_info, u64 progress_objectid,
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int init_flags);
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static void qgroup_rescan_zero_tracking(struct btrfs_fs_info *fs_info);
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/* must be called with qgroup_ioctl_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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static void __del_qgroup_rb(struct btrfs_qgroup *qgroup)
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{
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struct btrfs_qgroup_list *list;
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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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}
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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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if (!qgroup)
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return -ENOENT;
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rb_erase(&qgroup->node, &fs_info->qgroup_tree);
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__del_qgroup_rb(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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#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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{
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struct btrfs_qgroup *qgroup;
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qgroup = find_qgroup_rb(fs_info, qgroupid);
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if (!qgroup)
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return -EINVAL;
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if (qgroup->rfer != rfer || qgroup->excl != excl)
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return -EINVAL;
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return 0;
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}
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#endif
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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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u64 rescan_progress = 0;
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if (!fs_info->quota_enabled)
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return 0;
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fs_info->qgroup_ulist = ulist_alloc(GFP_NOFS);
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if (!fs_info->qgroup_ulist) {
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ret = -ENOMEM;
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goto out;
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}
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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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btrfs_err(fs_info,
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"old qgroup version, quota disabled");
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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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btrfs_err(fs_info,
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"qgroup generation mismatch, "
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"marked as inconsistent");
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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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rescan_progress = btrfs_qgroup_status_rescan(l, ptr);
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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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btrfs_err(fs_info, "inconsitent qgroup config");
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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 == -ENOENT) {
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btrfs_warn(fs_info,
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"orphan qgroup relation 0x%llx->0x%llx",
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found_key.objectid, found_key.offset);
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ret = 0; /* ignore the error */
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}
|
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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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} else if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN &&
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ret >= 0) {
|
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ret = qgroup_rescan_init(fs_info, rescan_progress, 0);
|
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}
|
|
btrfs_free_path(path);
|
|
|
|
if (ret < 0) {
|
|
ulist_free(fs_info->qgroup_ulist);
|
|
fs_info->qgroup_ulist = NULL;
|
|
fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN;
|
|
}
|
|
|
|
return ret < 0 ? ret : 0;
|
|
}
|
|
|
|
/*
|
|
* This is called from close_ctree() or open_ctree() or btrfs_quota_disable(),
|
|
* first two are in single-threaded paths.And for the third one, we have set
|
|
* quota_root to be null with qgroup_lock held before, so it is safe to clean
|
|
* up the in-memory structures without qgroup_lock held.
|
|
*/
|
|
void btrfs_free_qgroup_config(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct rb_node *n;
|
|
struct btrfs_qgroup *qgroup;
|
|
|
|
while ((n = rb_first(&fs_info->qgroup_tree))) {
|
|
qgroup = rb_entry(n, struct btrfs_qgroup, node);
|
|
rb_erase(n, &fs_info->qgroup_tree);
|
|
__del_qgroup_rb(qgroup);
|
|
}
|
|
/*
|
|
* we call btrfs_free_qgroup_config() when umounting
|
|
* filesystem and disabling quota, so we set qgroup_ulit
|
|
* to be null here to avoid double free.
|
|
*/
|
|
ulist_free(fs_info->qgroup_ulist);
|
|
fs_info->qgroup_ulist = NULL;
|
|
}
|
|
|
|
static int add_qgroup_relation_item(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *quota_root,
|
|
u64 src, u64 dst)
|
|
{
|
|
int ret;
|
|
struct btrfs_path *path;
|
|
struct btrfs_key key;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
key.objectid = src;
|
|
key.type = BTRFS_QGROUP_RELATION_KEY;
|
|
key.offset = dst;
|
|
|
|
ret = btrfs_insert_empty_item(trans, quota_root, path, &key, 0);
|
|
|
|
btrfs_mark_buffer_dirty(path->nodes[0]);
|
|
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static int del_qgroup_relation_item(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *quota_root,
|
|
u64 src, u64 dst)
|
|
{
|
|
int ret;
|
|
struct btrfs_path *path;
|
|
struct btrfs_key key;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
key.objectid = src;
|
|
key.type = BTRFS_QGROUP_RELATION_KEY;
|
|
key.offset = dst;
|
|
|
|
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 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;
|
|
|
|
if (btrfs_test_is_dummy_root(quota_root))
|
|
return 0;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
key.objectid = 0;
|
|
key.type = BTRFS_QGROUP_INFO_KEY;
|
|
key.offset = qgroupid;
|
|
|
|
/*
|
|
* Avoid a transaction abort by catching -EEXIST here. In that
|
|
* case, we proceed by re-initializing the existing structure
|
|
* on disk.
|
|
*/
|
|
|
|
ret = btrfs_insert_empty_item(trans, quota_root, path, &key,
|
|
sizeof(*qgroup_info));
|
|
if (ret && ret != -EEXIST)
|
|
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 && ret != -EEXIST)
|
|
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();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
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, slot, 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;
|
|
|
|
if (btrfs_test_is_dummy_root(root))
|
|
return 0;
|
|
|
|
key.objectid = 0;
|
|
key.type = BTRFS_QGROUP_INFO_KEY;
|
|
key.offset = qgroup->qgroupid;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
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, slot, 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();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
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);
|
|
btrfs_set_qgroup_status_rescan(l, ptr,
|
|
fs_info->qgroup_rescan_progress.objectid);
|
|
|
|
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;
|
|
struct extent_buffer *leaf = NULL;
|
|
int ret;
|
|
int nr = 0;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
path->leave_spinning = 1;
|
|
|
|
key.objectid = 0;
|
|
key.offset = 0;
|
|
key.type = 0;
|
|
|
|
while (1) {
|
|
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
|
|
if (ret < 0)
|
|
goto out;
|
|
leaf = path->nodes[0];
|
|
nr = btrfs_header_nritems(leaf);
|
|
if (!nr)
|
|
break;
|
|
/*
|
|
* delete the leaf one by one
|
|
* since the whole tree is going
|
|
* to be deleted.
|
|
*/
|
|
path->slots[0] = 0;
|
|
ret = btrfs_del_items(trans, root, path, 0, nr);
|
|
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_root *tree_root = fs_info->tree_root;
|
|
struct btrfs_path *path = NULL;
|
|
struct btrfs_qgroup_status_item *ptr;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_key key;
|
|
struct btrfs_key found_key;
|
|
struct btrfs_qgroup *qgroup = NULL;
|
|
int ret = 0;
|
|
int slot;
|
|
|
|
mutex_lock(&fs_info->qgroup_ioctl_lock);
|
|
if (fs_info->quota_root) {
|
|
fs_info->pending_quota_state = 1;
|
|
goto out;
|
|
}
|
|
|
|
fs_info->qgroup_ulist = ulist_alloc(GFP_NOFS);
|
|
if (!fs_info->qgroup_ulist) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* 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) {
|
|
ret = -ENOMEM;
|
|
goto out_free_root;
|
|
}
|
|
|
|
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_free_path;
|
|
|
|
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_rescan(leaf, ptr, 0);
|
|
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
|
|
key.objectid = 0;
|
|
key.type = BTRFS_ROOT_REF_KEY;
|
|
key.offset = 0;
|
|
|
|
btrfs_release_path(path);
|
|
ret = btrfs_search_slot_for_read(tree_root, &key, path, 1, 0);
|
|
if (ret > 0)
|
|
goto out_add_root;
|
|
if (ret < 0)
|
|
goto out_free_path;
|
|
|
|
|
|
while (1) {
|
|
slot = path->slots[0];
|
|
leaf = path->nodes[0];
|
|
btrfs_item_key_to_cpu(leaf, &found_key, slot);
|
|
|
|
if (found_key.type == BTRFS_ROOT_REF_KEY) {
|
|
ret = add_qgroup_item(trans, quota_root,
|
|
found_key.offset);
|
|
if (ret)
|
|
goto out_free_path;
|
|
|
|
qgroup = add_qgroup_rb(fs_info, found_key.offset);
|
|
if (IS_ERR(qgroup)) {
|
|
ret = PTR_ERR(qgroup);
|
|
goto out_free_path;
|
|
}
|
|
}
|
|
ret = btrfs_next_item(tree_root, path);
|
|
if (ret < 0)
|
|
goto out_free_path;
|
|
if (ret)
|
|
break;
|
|
}
|
|
|
|
out_add_root:
|
|
btrfs_release_path(path);
|
|
ret = add_qgroup_item(trans, quota_root, BTRFS_FS_TREE_OBJECTID);
|
|
if (ret)
|
|
goto out_free_path;
|
|
|
|
qgroup = add_qgroup_rb(fs_info, BTRFS_FS_TREE_OBJECTID);
|
|
if (IS_ERR(qgroup)) {
|
|
ret = PTR_ERR(qgroup);
|
|
goto out_free_path;
|
|
}
|
|
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_free_path:
|
|
btrfs_free_path(path);
|
|
out_free_root:
|
|
if (ret) {
|
|
free_extent_buffer(quota_root->node);
|
|
free_extent_buffer(quota_root->commit_root);
|
|
kfree(quota_root);
|
|
}
|
|
out:
|
|
if (ret) {
|
|
ulist_free(fs_info->qgroup_ulist);
|
|
fs_info->qgroup_ulist = NULL;
|
|
}
|
|
mutex_unlock(&fs_info->qgroup_ioctl_lock);
|
|
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;
|
|
|
|
mutex_lock(&fs_info->qgroup_ioctl_lock);
|
|
if (!fs_info->quota_root)
|
|
goto out;
|
|
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;
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
|
|
btrfs_free_qgroup_config(fs_info);
|
|
|
|
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:
|
|
mutex_unlock(&fs_info->qgroup_ioctl_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);
|
|
}
|
|
|
|
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;
|
|
struct btrfs_qgroup *parent;
|
|
struct btrfs_qgroup *member;
|
|
struct btrfs_qgroup_list *list;
|
|
int ret = 0;
|
|
|
|
mutex_lock(&fs_info->qgroup_ioctl_lock);
|
|
quota_root = fs_info->quota_root;
|
|
if (!quota_root) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
member = find_qgroup_rb(fs_info, src);
|
|
parent = find_qgroup_rb(fs_info, dst);
|
|
if (!member || !parent) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/* check if such qgroup relation exist firstly */
|
|
list_for_each_entry(list, &member->groups, next_group) {
|
|
if (list->group == parent) {
|
|
ret = -EEXIST;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
ret = add_qgroup_relation_item(trans, quota_root, src, dst);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = add_qgroup_relation_item(trans, quota_root, dst, src);
|
|
if (ret) {
|
|
del_qgroup_relation_item(trans, quota_root, src, dst);
|
|
goto out;
|
|
}
|
|
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
ret = add_relation_rb(quota_root->fs_info, src, dst);
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
out:
|
|
mutex_unlock(&fs_info->qgroup_ioctl_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;
|
|
struct btrfs_qgroup *parent;
|
|
struct btrfs_qgroup *member;
|
|
struct btrfs_qgroup_list *list;
|
|
int ret = 0;
|
|
int err;
|
|
|
|
mutex_lock(&fs_info->qgroup_ioctl_lock);
|
|
quota_root = fs_info->quota_root;
|
|
if (!quota_root) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
member = find_qgroup_rb(fs_info, src);
|
|
parent = find_qgroup_rb(fs_info, dst);
|
|
if (!member || !parent) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/* check if such qgroup relation exist firstly */
|
|
list_for_each_entry(list, &member->groups, next_group) {
|
|
if (list->group == parent)
|
|
goto exist;
|
|
}
|
|
ret = -ENOENT;
|
|
goto out;
|
|
exist:
|
|
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);
|
|
out:
|
|
mutex_unlock(&fs_info->qgroup_ioctl_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;
|
|
|
|
mutex_lock(&fs_info->qgroup_ioctl_lock);
|
|
quota_root = fs_info->quota_root;
|
|
if (!quota_root) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
qgroup = find_qgroup_rb(fs_info, qgroupid);
|
|
if (qgroup) {
|
|
ret = -EEXIST;
|
|
goto out;
|
|
}
|
|
|
|
ret = add_qgroup_item(trans, quota_root, qgroupid);
|
|
if (ret)
|
|
goto out;
|
|
|
|
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);
|
|
out:
|
|
mutex_unlock(&fs_info->qgroup_ioctl_lock);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_remove_qgroup(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info, u64 qgroupid)
|
|
{
|
|
struct btrfs_root *quota_root;
|
|
struct btrfs_qgroup *qgroup;
|
|
int ret = 0;
|
|
|
|
mutex_lock(&fs_info->qgroup_ioctl_lock);
|
|
quota_root = fs_info->quota_root;
|
|
if (!quota_root) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
qgroup = find_qgroup_rb(fs_info, qgroupid);
|
|
if (!qgroup) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
} else {
|
|
/* check if there are no relations to this qgroup */
|
|
if (!list_empty(&qgroup->groups) ||
|
|
!list_empty(&qgroup->members)) {
|
|
ret = -EBUSY;
|
|
goto out;
|
|
}
|
|
}
|
|
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);
|
|
out:
|
|
mutex_unlock(&fs_info->qgroup_ioctl_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;
|
|
struct btrfs_qgroup *qgroup;
|
|
int ret = 0;
|
|
|
|
mutex_lock(&fs_info->qgroup_ioctl_lock);
|
|
quota_root = fs_info->quota_root;
|
|
if (!quota_root) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
qgroup = find_qgroup_rb(fs_info, qgroupid);
|
|
if (!qgroup) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
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;
|
|
btrfs_info(fs_info, "unable to update quota limit for %llu",
|
|
qgroupid);
|
|
}
|
|
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
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;
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
out:
|
|
mutex_unlock(&fs_info->qgroup_ioctl_lock);
|
|
return ret;
|
|
}
|
|
|
|
static int comp_oper_exist(struct btrfs_qgroup_operation *oper1,
|
|
struct btrfs_qgroup_operation *oper2)
|
|
{
|
|
/*
|
|
* Ignore seq and type here, we're looking for any operation
|
|
* at all related to this extent on that root.
|
|
*/
|
|
if (oper1->bytenr < oper2->bytenr)
|
|
return -1;
|
|
if (oper1->bytenr > oper2->bytenr)
|
|
return 1;
|
|
if (oper1->ref_root < oper2->ref_root)
|
|
return -1;
|
|
if (oper1->ref_root > oper2->ref_root)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static int qgroup_oper_exists(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_qgroup_operation *oper)
|
|
{
|
|
struct rb_node *n;
|
|
struct btrfs_qgroup_operation *cur;
|
|
int cmp;
|
|
|
|
spin_lock(&fs_info->qgroup_op_lock);
|
|
n = fs_info->qgroup_op_tree.rb_node;
|
|
while (n) {
|
|
cur = rb_entry(n, struct btrfs_qgroup_operation, n);
|
|
cmp = comp_oper_exist(cur, oper);
|
|
if (cmp < 0) {
|
|
n = n->rb_right;
|
|
} else if (cmp) {
|
|
n = n->rb_left;
|
|
} else {
|
|
spin_unlock(&fs_info->qgroup_op_lock);
|
|
return -EEXIST;
|
|
}
|
|
}
|
|
spin_unlock(&fs_info->qgroup_op_lock);
|
|
return 0;
|
|
}
|
|
|
|
static int comp_oper(struct btrfs_qgroup_operation *oper1,
|
|
struct btrfs_qgroup_operation *oper2)
|
|
{
|
|
if (oper1->bytenr < oper2->bytenr)
|
|
return -1;
|
|
if (oper1->bytenr > oper2->bytenr)
|
|
return 1;
|
|
if (oper1->seq < oper2->seq)
|
|
return -1;
|
|
if (oper1->seq > oper2->seq)
|
|
return -1;
|
|
if (oper1->ref_root < oper2->ref_root)
|
|
return -1;
|
|
if (oper1->ref_root > oper2->ref_root)
|
|
return 1;
|
|
if (oper1->type < oper2->type)
|
|
return -1;
|
|
if (oper1->type > oper2->type)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static int insert_qgroup_oper(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_qgroup_operation *oper)
|
|
{
|
|
struct rb_node **p;
|
|
struct rb_node *parent = NULL;
|
|
struct btrfs_qgroup_operation *cur;
|
|
int cmp;
|
|
|
|
spin_lock(&fs_info->qgroup_op_lock);
|
|
p = &fs_info->qgroup_op_tree.rb_node;
|
|
while (*p) {
|
|
parent = *p;
|
|
cur = rb_entry(parent, struct btrfs_qgroup_operation, n);
|
|
cmp = comp_oper(cur, oper);
|
|
if (cmp < 0) {
|
|
p = &(*p)->rb_right;
|
|
} else if (cmp) {
|
|
p = &(*p)->rb_left;
|
|
} else {
|
|
spin_unlock(&fs_info->qgroup_op_lock);
|
|
return -EEXIST;
|
|
}
|
|
}
|
|
rb_link_node(&oper->n, parent, p);
|
|
rb_insert_color(&oper->n, &fs_info->qgroup_op_tree);
|
|
spin_unlock(&fs_info->qgroup_op_lock);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Record a quota operation for processing later on.
|
|
* @trans: the transaction we are adding the delayed op to.
|
|
* @fs_info: the fs_info for this fs.
|
|
* @ref_root: the root of the reference we are acting on,
|
|
* @bytenr: the bytenr we are acting on.
|
|
* @num_bytes: the number of bytes in the reference.
|
|
* @type: the type of operation this is.
|
|
* @mod_seq: do we need to get a sequence number for looking up roots.
|
|
*
|
|
* We just add it to our trans qgroup_ref_list and carry on and process these
|
|
* operations in order at some later point. If the reference root isn't a fs
|
|
* root then we don't bother with doing anything.
|
|
*
|
|
* MUST BE HOLDING THE REF LOCK.
|
|
*/
|
|
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)
|
|
{
|
|
struct btrfs_qgroup_operation *oper;
|
|
int ret;
|
|
|
|
if (!is_fstree(ref_root) || !fs_info->quota_enabled)
|
|
return 0;
|
|
|
|
oper = kmalloc(sizeof(*oper), GFP_NOFS);
|
|
if (!oper)
|
|
return -ENOMEM;
|
|
|
|
oper->ref_root = ref_root;
|
|
oper->bytenr = bytenr;
|
|
oper->num_bytes = num_bytes;
|
|
oper->type = type;
|
|
oper->seq = atomic_inc_return(&fs_info->qgroup_op_seq);
|
|
INIT_LIST_HEAD(&oper->elem.list);
|
|
oper->elem.seq = 0;
|
|
|
|
trace_btrfs_qgroup_record_ref(oper);
|
|
|
|
if (type == BTRFS_QGROUP_OPER_SUB_SUBTREE) {
|
|
/*
|
|
* If any operation for this bytenr/ref_root combo
|
|
* exists, then we know it's not exclusively owned and
|
|
* shouldn't be queued up.
|
|
*
|
|
* This also catches the case where we have a cloned
|
|
* extent that gets queued up multiple times during
|
|
* drop snapshot.
|
|
*/
|
|
if (qgroup_oper_exists(fs_info, oper)) {
|
|
kfree(oper);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
ret = insert_qgroup_oper(fs_info, oper);
|
|
if (ret) {
|
|
/* Shouldn't happen so have an assert for developers */
|
|
ASSERT(0);
|
|
kfree(oper);
|
|
return ret;
|
|
}
|
|
list_add_tail(&oper->list, &trans->qgroup_ref_list);
|
|
|
|
if (mod_seq)
|
|
btrfs_get_tree_mod_seq(fs_info, &oper->elem);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The easy accounting, if we are adding/removing the only ref for an extent
|
|
* then this qgroup and all of the parent qgroups get their refrence and
|
|
* exclusive counts adjusted.
|
|
*/
|
|
static int qgroup_excl_accounting(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_qgroup_operation *oper)
|
|
{
|
|
struct btrfs_qgroup *qgroup;
|
|
struct ulist *tmp;
|
|
struct btrfs_qgroup_list *glist;
|
|
struct ulist_node *unode;
|
|
struct ulist_iterator uiter;
|
|
int sign = 0;
|
|
int ret = 0;
|
|
|
|
tmp = ulist_alloc(GFP_NOFS);
|
|
if (!tmp)
|
|
return -ENOMEM;
|
|
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
if (!fs_info->quota_root)
|
|
goto out;
|
|
qgroup = find_qgroup_rb(fs_info, oper->ref_root);
|
|
if (!qgroup)
|
|
goto out;
|
|
switch (oper->type) {
|
|
case BTRFS_QGROUP_OPER_ADD_EXCL:
|
|
sign = 1;
|
|
break;
|
|
case BTRFS_QGROUP_OPER_SUB_EXCL:
|
|
sign = -1;
|
|
break;
|
|
default:
|
|
ASSERT(0);
|
|
}
|
|
qgroup->rfer += sign * oper->num_bytes;
|
|
qgroup->rfer_cmpr += sign * oper->num_bytes;
|
|
|
|
WARN_ON(sign < 0 && qgroup->excl < oper->num_bytes);
|
|
qgroup->excl += sign * oper->num_bytes;
|
|
qgroup->excl_cmpr += sign * oper->num_bytes;
|
|
|
|
qgroup_dirty(fs_info, qgroup);
|
|
|
|
/* Get all of the parent groups that contain this qgroup */
|
|
list_for_each_entry(glist, &qgroup->groups, next_group) {
|
|
ret = ulist_add(tmp, glist->group->qgroupid,
|
|
ptr_to_u64(glist->group), GFP_ATOMIC);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
|
|
/* Iterate all of the parents and adjust their reference counts */
|
|
ULIST_ITER_INIT(&uiter);
|
|
while ((unode = ulist_next(tmp, &uiter))) {
|
|
qgroup = u64_to_ptr(unode->aux);
|
|
qgroup->rfer += sign * oper->num_bytes;
|
|
qgroup->rfer_cmpr += sign * oper->num_bytes;
|
|
WARN_ON(sign < 0 && qgroup->excl < oper->num_bytes);
|
|
qgroup->excl += sign * oper->num_bytes;
|
|
qgroup->excl_cmpr += sign * oper->num_bytes;
|
|
qgroup_dirty(fs_info, qgroup);
|
|
|
|
/* Add any parents of the parents */
|
|
list_for_each_entry(glist, &qgroup->groups, next_group) {
|
|
ret = ulist_add(tmp, glist->group->qgroupid,
|
|
ptr_to_u64(glist->group), GFP_ATOMIC);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
}
|
|
ret = 0;
|
|
out:
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
ulist_free(tmp);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Walk all of the roots that pointed to our bytenr and adjust their refcnts as
|
|
* properly.
|
|
*/
|
|
static int qgroup_calc_old_refcnt(struct btrfs_fs_info *fs_info,
|
|
u64 root_to_skip, struct ulist *tmp,
|
|
struct ulist *roots, struct ulist *qgroups,
|
|
u64 seq, int *old_roots, int rescan)
|
|
{
|
|
struct ulist_node *unode;
|
|
struct ulist_iterator uiter;
|
|
struct ulist_node *tmp_unode;
|
|
struct ulist_iterator tmp_uiter;
|
|
struct btrfs_qgroup *qg;
|
|
int ret;
|
|
|
|
ULIST_ITER_INIT(&uiter);
|
|
while ((unode = ulist_next(roots, &uiter))) {
|
|
/* We don't count our current root here */
|
|
if (unode->val == root_to_skip)
|
|
continue;
|
|
qg = find_qgroup_rb(fs_info, unode->val);
|
|
if (!qg)
|
|
continue;
|
|
/*
|
|
* We could have a pending removal of this same ref so we may
|
|
* not have actually found our ref root when doing
|
|
* btrfs_find_all_roots, so we need to keep track of how many
|
|
* old roots we find in case we removed ours and added a
|
|
* different one at the same time. I don't think this could
|
|
* happen in practice but that sort of thinking leads to pain
|
|
* and suffering and to the dark side.
|
|
*/
|
|
(*old_roots)++;
|
|
|
|
ulist_reinit(tmp);
|
|
ret = ulist_add(qgroups, qg->qgroupid, ptr_to_u64(qg),
|
|
GFP_ATOMIC);
|
|
if (ret < 0)
|
|
return ret;
|
|
ret = ulist_add(tmp, qg->qgroupid, ptr_to_u64(qg), GFP_ATOMIC);
|
|
if (ret < 0)
|
|
return ret;
|
|
ULIST_ITER_INIT(&tmp_uiter);
|
|
while ((tmp_unode = ulist_next(tmp, &tmp_uiter))) {
|
|
struct btrfs_qgroup_list *glist;
|
|
|
|
qg = u64_to_ptr(tmp_unode->aux);
|
|
/*
|
|
* We use this sequence number to keep from having to
|
|
* run the whole list and 0 out the refcnt every time.
|
|
* We basically use sequnce as the known 0 count and
|
|
* then add 1 everytime we see a qgroup. This is how we
|
|
* get how many of the roots actually point up to the
|
|
* upper level qgroups in order to determine exclusive
|
|
* counts.
|
|
*
|
|
* For rescan we want to set old_refcnt to seq so our
|
|
* exclusive calculations end up correct.
|
|
*/
|
|
if (rescan)
|
|
qg->old_refcnt = seq;
|
|
else if (qg->old_refcnt < seq)
|
|
qg->old_refcnt = seq + 1;
|
|
else
|
|
qg->old_refcnt++;
|
|
|
|
if (qg->new_refcnt < seq)
|
|
qg->new_refcnt = seq + 1;
|
|
else
|
|
qg->new_refcnt++;
|
|
list_for_each_entry(glist, &qg->groups, next_group) {
|
|
ret = ulist_add(qgroups, glist->group->qgroupid,
|
|
ptr_to_u64(glist->group),
|
|
GFP_ATOMIC);
|
|
if (ret < 0)
|
|
return ret;
|
|
ret = ulist_add(tmp, glist->group->qgroupid,
|
|
ptr_to_u64(glist->group),
|
|
GFP_ATOMIC);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* We need to walk forward in our operation tree and account for any roots that
|
|
* were deleted after we made this operation.
|
|
*/
|
|
static int qgroup_account_deleted_refs(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_qgroup_operation *oper,
|
|
struct ulist *tmp,
|
|
struct ulist *qgroups, u64 seq,
|
|
int *old_roots)
|
|
{
|
|
struct ulist_node *unode;
|
|
struct ulist_iterator uiter;
|
|
struct btrfs_qgroup *qg;
|
|
struct btrfs_qgroup_operation *tmp_oper;
|
|
struct rb_node *n;
|
|
int ret;
|
|
|
|
ulist_reinit(tmp);
|
|
|
|
/*
|
|
* We only walk forward in the tree since we're only interested in
|
|
* removals that happened _after_ our operation.
|
|
*/
|
|
spin_lock(&fs_info->qgroup_op_lock);
|
|
n = rb_next(&oper->n);
|
|
spin_unlock(&fs_info->qgroup_op_lock);
|
|
if (!n)
|
|
return 0;
|
|
tmp_oper = rb_entry(n, struct btrfs_qgroup_operation, n);
|
|
while (tmp_oper->bytenr == oper->bytenr) {
|
|
/*
|
|
* If it's not a removal we don't care, additions work out
|
|
* properly with our refcnt tracking.
|
|
*/
|
|
if (tmp_oper->type != BTRFS_QGROUP_OPER_SUB_SHARED &&
|
|
tmp_oper->type != BTRFS_QGROUP_OPER_SUB_EXCL)
|
|
goto next;
|
|
qg = find_qgroup_rb(fs_info, tmp_oper->ref_root);
|
|
if (!qg)
|
|
goto next;
|
|
ret = ulist_add(qgroups, qg->qgroupid, ptr_to_u64(qg),
|
|
GFP_ATOMIC);
|
|
if (ret) {
|
|
if (ret < 0)
|
|
return ret;
|
|
/*
|
|
* We only want to increase old_roots if this qgroup is
|
|
* not already in the list of qgroups. If it is already
|
|
* there then that means it must have been re-added or
|
|
* the delete will be discarded because we had an
|
|
* existing ref that we haven't looked up yet. In this
|
|
* case we don't want to increase old_roots. So if ret
|
|
* == 1 then we know that this is the first time we've
|
|
* seen this qgroup and we can bump the old_roots.
|
|
*/
|
|
(*old_roots)++;
|
|
ret = ulist_add(tmp, qg->qgroupid, ptr_to_u64(qg),
|
|
GFP_ATOMIC);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
next:
|
|
spin_lock(&fs_info->qgroup_op_lock);
|
|
n = rb_next(&tmp_oper->n);
|
|
spin_unlock(&fs_info->qgroup_op_lock);
|
|
if (!n)
|
|
break;
|
|
tmp_oper = rb_entry(n, struct btrfs_qgroup_operation, n);
|
|
}
|
|
|
|
/* Ok now process the qgroups we found */
|
|
ULIST_ITER_INIT(&uiter);
|
|
while ((unode = ulist_next(tmp, &uiter))) {
|
|
struct btrfs_qgroup_list *glist;
|
|
|
|
qg = u64_to_ptr(unode->aux);
|
|
if (qg->old_refcnt < seq)
|
|
qg->old_refcnt = seq + 1;
|
|
else
|
|
qg->old_refcnt++;
|
|
if (qg->new_refcnt < seq)
|
|
qg->new_refcnt = seq + 1;
|
|
else
|
|
qg->new_refcnt++;
|
|
list_for_each_entry(glist, &qg->groups, next_group) {
|
|
ret = ulist_add(qgroups, glist->group->qgroupid,
|
|
ptr_to_u64(glist->group), GFP_ATOMIC);
|
|
if (ret < 0)
|
|
return ret;
|
|
ret = ulist_add(tmp, glist->group->qgroupid,
|
|
ptr_to_u64(glist->group), GFP_ATOMIC);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Add refcnt for the newly added reference. */
|
|
static int qgroup_calc_new_refcnt(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_qgroup_operation *oper,
|
|
struct btrfs_qgroup *qgroup,
|
|
struct ulist *tmp, struct ulist *qgroups,
|
|
u64 seq)
|
|
{
|
|
struct ulist_node *unode;
|
|
struct ulist_iterator uiter;
|
|
struct btrfs_qgroup *qg;
|
|
int ret;
|
|
|
|
ulist_reinit(tmp);
|
|
ret = ulist_add(qgroups, qgroup->qgroupid, ptr_to_u64(qgroup),
|
|
GFP_ATOMIC);
|
|
if (ret < 0)
|
|
return ret;
|
|
ret = ulist_add(tmp, qgroup->qgroupid, ptr_to_u64(qgroup),
|
|
GFP_ATOMIC);
|
|
if (ret < 0)
|
|
return ret;
|
|
ULIST_ITER_INIT(&uiter);
|
|
while ((unode = ulist_next(tmp, &uiter))) {
|
|
struct btrfs_qgroup_list *glist;
|
|
|
|
qg = u64_to_ptr(unode->aux);
|
|
if (oper->type == BTRFS_QGROUP_OPER_ADD_SHARED) {
|
|
if (qg->new_refcnt < seq)
|
|
qg->new_refcnt = seq + 1;
|
|
else
|
|
qg->new_refcnt++;
|
|
} else {
|
|
if (qg->old_refcnt < seq)
|
|
qg->old_refcnt = seq + 1;
|
|
else
|
|
qg->old_refcnt++;
|
|
}
|
|
list_for_each_entry(glist, &qg->groups, next_group) {
|
|
ret = ulist_add(tmp, glist->group->qgroupid,
|
|
ptr_to_u64(glist->group), GFP_ATOMIC);
|
|
if (ret < 0)
|
|
return ret;
|
|
ret = ulist_add(qgroups, glist->group->qgroupid,
|
|
ptr_to_u64(glist->group), GFP_ATOMIC);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This adjusts the counters for all referenced qgroups if need be.
|
|
*/
|
|
static int qgroup_adjust_counters(struct btrfs_fs_info *fs_info,
|
|
u64 root_to_skip, u64 num_bytes,
|
|
struct ulist *qgroups, u64 seq,
|
|
int old_roots, int new_roots, int rescan)
|
|
{
|
|
struct ulist_node *unode;
|
|
struct ulist_iterator uiter;
|
|
struct btrfs_qgroup *qg;
|
|
u64 cur_new_count, cur_old_count;
|
|
|
|
ULIST_ITER_INIT(&uiter);
|
|
while ((unode = ulist_next(qgroups, &uiter))) {
|
|
bool dirty = false;
|
|
|
|
qg = u64_to_ptr(unode->aux);
|
|
/*
|
|
* Wasn't referenced before but is now, add to the reference
|
|
* counters.
|
|
*/
|
|
if (qg->old_refcnt <= seq && qg->new_refcnt > seq) {
|
|
qg->rfer += num_bytes;
|
|
qg->rfer_cmpr += num_bytes;
|
|
dirty = true;
|
|
}
|
|
|
|
/*
|
|
* Was referenced before but isn't now, subtract from the
|
|
* reference counters.
|
|
*/
|
|
if (qg->old_refcnt > seq && qg->new_refcnt <= seq) {
|
|
qg->rfer -= num_bytes;
|
|
qg->rfer_cmpr -= num_bytes;
|
|
dirty = true;
|
|
}
|
|
|
|
if (qg->old_refcnt < seq)
|
|
cur_old_count = 0;
|
|
else
|
|
cur_old_count = qg->old_refcnt - seq;
|
|
if (qg->new_refcnt < seq)
|
|
cur_new_count = 0;
|
|
else
|
|
cur_new_count = qg->new_refcnt - seq;
|
|
|
|
/*
|
|
* If our refcount was the same as the roots previously but our
|
|
* new count isn't the same as the number of roots now then we
|
|
* went from having a exclusive reference on this range to not.
|
|
*/
|
|
if (old_roots && cur_old_count == old_roots &&
|
|
(cur_new_count != new_roots || new_roots == 0)) {
|
|
WARN_ON(cur_new_count != new_roots && new_roots == 0);
|
|
qg->excl -= num_bytes;
|
|
qg->excl_cmpr -= num_bytes;
|
|
dirty = true;
|
|
}
|
|
|
|
/*
|
|
* If we didn't reference all the roots before but now we do we
|
|
* have an exclusive reference to this range.
|
|
*/
|
|
if ((!old_roots || (old_roots && cur_old_count != old_roots))
|
|
&& cur_new_count == new_roots) {
|
|
qg->excl += num_bytes;
|
|
qg->excl_cmpr += num_bytes;
|
|
dirty = true;
|
|
}
|
|
|
|
if (dirty)
|
|
qgroup_dirty(fs_info, qg);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* If we removed a data extent and there were other references for that bytenr
|
|
* then we need to lookup all referenced roots to make sure we still don't
|
|
* reference this bytenr. If we do then we can just discard this operation.
|
|
*/
|
|
static int check_existing_refs(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info,
|
|
struct btrfs_qgroup_operation *oper)
|
|
{
|
|
struct ulist *roots = NULL;
|
|
struct ulist_node *unode;
|
|
struct ulist_iterator uiter;
|
|
int ret = 0;
|
|
|
|
ret = btrfs_find_all_roots(trans, fs_info, oper->bytenr,
|
|
oper->elem.seq, &roots);
|
|
if (ret < 0)
|
|
return ret;
|
|
ret = 0;
|
|
|
|
ULIST_ITER_INIT(&uiter);
|
|
while ((unode = ulist_next(roots, &uiter))) {
|
|
if (unode->val == oper->ref_root) {
|
|
ret = 1;
|
|
break;
|
|
}
|
|
}
|
|
ulist_free(roots);
|
|
btrfs_put_tree_mod_seq(fs_info, &oper->elem);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* If we share a reference across multiple roots then we may need to adjust
|
|
* various qgroups referenced and exclusive counters. The basic premise is this
|
|
*
|
|
* 1) We have seq to represent a 0 count. Instead of looping through all of the
|
|
* qgroups and resetting their refcount to 0 we just constantly bump this
|
|
* sequence number to act as the base reference count. This means that if
|
|
* anybody is equal to or below this sequence they were never referenced. We
|
|
* jack this sequence up by the number of roots we found each time in order to
|
|
* make sure we don't have any overlap.
|
|
*
|
|
* 2) We first search all the roots that reference the area _except_ the root
|
|
* we're acting on currently. This makes up the old_refcnt of all the qgroups
|
|
* before.
|
|
*
|
|
* 3) We walk all of the qgroups referenced by the root we are currently acting
|
|
* on, and will either adjust old_refcnt in the case of a removal or the
|
|
* new_refcnt in the case of an addition.
|
|
*
|
|
* 4) Finally we walk all the qgroups that are referenced by this range
|
|
* including the root we are acting on currently. We will adjust the counters
|
|
* based on the number of roots we had and will have after this operation.
|
|
*
|
|
* Take this example as an illustration
|
|
*
|
|
* [qgroup 1/0]
|
|
* / | \
|
|
* [qg 0/0] [qg 0/1] [qg 0/2]
|
|
* \ | /
|
|
* [ extent ]
|
|
*
|
|
* Say we are adding a reference that is covered by qg 0/0. The first step
|
|
* would give a refcnt of 1 to qg 0/1 and 0/2 and a refcnt of 2 to qg 1/0 with
|
|
* old_roots being 2. Because it is adding new_roots will be 1. We then go
|
|
* through qg 0/0 which will get the new_refcnt set to 1 and add 1 to qg 1/0's
|
|
* new_refcnt, bringing it to 3. We then walk through all of the qgroups, we
|
|
* notice that the old refcnt for qg 0/0 < the new refcnt, so we added a
|
|
* reference and thus must add the size to the referenced bytes. Everything
|
|
* else is the same so nothing else changes.
|
|
*/
|
|
static int qgroup_shared_accounting(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info,
|
|
struct btrfs_qgroup_operation *oper)
|
|
{
|
|
struct ulist *roots = NULL;
|
|
struct ulist *qgroups, *tmp;
|
|
struct btrfs_qgroup *qgroup;
|
|
struct seq_list elem = {};
|
|
u64 seq;
|
|
int old_roots = 0;
|
|
int new_roots = 0;
|
|
int ret = 0;
|
|
|
|
if (oper->elem.seq) {
|
|
ret = check_existing_refs(trans, fs_info, oper);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (ret)
|
|
return 0;
|
|
}
|
|
|
|
qgroups = ulist_alloc(GFP_NOFS);
|
|
if (!qgroups)
|
|
return -ENOMEM;
|
|
|
|
tmp = ulist_alloc(GFP_NOFS);
|
|
if (!tmp) {
|
|
ulist_free(qgroups);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
btrfs_get_tree_mod_seq(fs_info, &elem);
|
|
ret = btrfs_find_all_roots(trans, fs_info, oper->bytenr, elem.seq,
|
|
&roots);
|
|
btrfs_put_tree_mod_seq(fs_info, &elem);
|
|
if (ret < 0) {
|
|
ulist_free(qgroups);
|
|
ulist_free(tmp);
|
|
return ret;
|
|
}
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
qgroup = find_qgroup_rb(fs_info, oper->ref_root);
|
|
if (!qgroup)
|
|
goto out;
|
|
seq = fs_info->qgroup_seq;
|
|
|
|
/*
|
|
* So roots is the list of all the roots currently pointing at the
|
|
* bytenr, including the ref we are adding if we are adding, or not if
|
|
* we are removing a ref. So we pass in the ref_root to skip that root
|
|
* in our calculations. We set old_refnct and new_refcnt cause who the
|
|
* hell knows what everything looked like before, and it doesn't matter
|
|
* except...
|
|
*/
|
|
ret = qgroup_calc_old_refcnt(fs_info, oper->ref_root, tmp, roots, qgroups,
|
|
seq, &old_roots, 0);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
/*
|
|
* Now adjust the refcounts of the qgroups that care about this
|
|
* reference, either the old_count in the case of removal or new_count
|
|
* in the case of an addition.
|
|
*/
|
|
ret = qgroup_calc_new_refcnt(fs_info, oper, qgroup, tmp, qgroups,
|
|
seq);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
/*
|
|
* ...in the case of removals. If we had a removal before we got around
|
|
* to processing this operation then we need to find that guy and count
|
|
* his references as if they really existed so we don't end up screwing
|
|
* up the exclusive counts. Then whenever we go to process the delete
|
|
* everything will be grand and we can account for whatever exclusive
|
|
* changes need to be made there. We also have to pass in old_roots so
|
|
* we have an accurate count of the roots as it pertains to this
|
|
* operations view of the world.
|
|
*/
|
|
ret = qgroup_account_deleted_refs(fs_info, oper, tmp, qgroups, seq,
|
|
&old_roots);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
/*
|
|
* We are adding our root, need to adjust up the number of roots,
|
|
* otherwise old_roots is the number of roots we want.
|
|
*/
|
|
if (oper->type == BTRFS_QGROUP_OPER_ADD_SHARED) {
|
|
new_roots = old_roots + 1;
|
|
} else {
|
|
new_roots = old_roots;
|
|
old_roots++;
|
|
}
|
|
fs_info->qgroup_seq += old_roots + 1;
|
|
|
|
|
|
/*
|
|
* And now the magic happens, bless Arne for having a pretty elegant
|
|
* solution for this.
|
|
*/
|
|
qgroup_adjust_counters(fs_info, oper->ref_root, oper->num_bytes,
|
|
qgroups, seq, old_roots, new_roots, 0);
|
|
out:
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
ulist_free(qgroups);
|
|
ulist_free(roots);
|
|
ulist_free(tmp);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Process a reference to a shared subtree. This type of operation is
|
|
* queued during snapshot removal when we encounter extents which are
|
|
* shared between more than one root.
|
|
*/
|
|
static int qgroup_subtree_accounting(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info,
|
|
struct btrfs_qgroup_operation *oper)
|
|
{
|
|
struct ulist *roots = NULL;
|
|
struct ulist_node *unode;
|
|
struct ulist_iterator uiter;
|
|
struct btrfs_qgroup_list *glist;
|
|
struct ulist *parents;
|
|
int ret = 0;
|
|
int err;
|
|
struct btrfs_qgroup *qg;
|
|
u64 root_obj = 0;
|
|
struct seq_list elem = {};
|
|
|
|
parents = ulist_alloc(GFP_NOFS);
|
|
if (!parents)
|
|
return -ENOMEM;
|
|
|
|
btrfs_get_tree_mod_seq(fs_info, &elem);
|
|
ret = btrfs_find_all_roots(trans, fs_info, oper->bytenr,
|
|
elem.seq, &roots);
|
|
btrfs_put_tree_mod_seq(fs_info, &elem);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
if (roots->nnodes != 1)
|
|
goto out;
|
|
|
|
ULIST_ITER_INIT(&uiter);
|
|
unode = ulist_next(roots, &uiter); /* Only want 1 so no need to loop */
|
|
/*
|
|
* If we find our ref root then that means all refs
|
|
* this extent has to the root have not yet been
|
|
* deleted. In that case, we do nothing and let the
|
|
* last ref for this bytenr drive our update.
|
|
*
|
|
* This can happen for example if an extent is
|
|
* referenced multiple times in a snapshot (clone,
|
|
* etc). If we are in the middle of snapshot removal,
|
|
* queued updates for such an extent will find the
|
|
* root if we have not yet finished removing the
|
|
* snapshot.
|
|
*/
|
|
if (unode->val == oper->ref_root)
|
|
goto out;
|
|
|
|
root_obj = unode->val;
|
|
BUG_ON(!root_obj);
|
|
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
qg = find_qgroup_rb(fs_info, root_obj);
|
|
if (!qg)
|
|
goto out_unlock;
|
|
|
|
qg->excl += oper->num_bytes;
|
|
qg->excl_cmpr += oper->num_bytes;
|
|
qgroup_dirty(fs_info, qg);
|
|
|
|
/*
|
|
* Adjust counts for parent groups. First we find all
|
|
* parents, then in the 2nd loop we do the adjustment
|
|
* while adding parents of the parents to our ulist.
|
|
*/
|
|
list_for_each_entry(glist, &qg->groups, next_group) {
|
|
err = ulist_add(parents, glist->group->qgroupid,
|
|
ptr_to_u64(glist->group), GFP_ATOMIC);
|
|
if (err < 0) {
|
|
ret = err;
|
|
goto out_unlock;
|
|
}
|
|
}
|
|
|
|
ULIST_ITER_INIT(&uiter);
|
|
while ((unode = ulist_next(parents, &uiter))) {
|
|
qg = u64_to_ptr(unode->aux);
|
|
qg->excl += oper->num_bytes;
|
|
qg->excl_cmpr += oper->num_bytes;
|
|
qgroup_dirty(fs_info, qg);
|
|
|
|
/* Add any parents of the parents */
|
|
list_for_each_entry(glist, &qg->groups, next_group) {
|
|
err = ulist_add(parents, glist->group->qgroupid,
|
|
ptr_to_u64(glist->group), GFP_ATOMIC);
|
|
if (err < 0) {
|
|
ret = err;
|
|
goto out_unlock;
|
|
}
|
|
}
|
|
}
|
|
|
|
out_unlock:
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
|
|
out:
|
|
ulist_free(roots);
|
|
ulist_free(parents);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
static int btrfs_qgroup_account(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info,
|
|
struct btrfs_qgroup_operation *oper)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (!fs_info->quota_enabled)
|
|
return 0;
|
|
|
|
BUG_ON(!fs_info->quota_root);
|
|
|
|
mutex_lock(&fs_info->qgroup_rescan_lock);
|
|
if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
|
|
if (fs_info->qgroup_rescan_progress.objectid <= oper->bytenr) {
|
|
mutex_unlock(&fs_info->qgroup_rescan_lock);
|
|
return 0;
|
|
}
|
|
}
|
|
mutex_unlock(&fs_info->qgroup_rescan_lock);
|
|
|
|
ASSERT(is_fstree(oper->ref_root));
|
|
|
|
trace_btrfs_qgroup_account(oper);
|
|
|
|
switch (oper->type) {
|
|
case BTRFS_QGROUP_OPER_ADD_EXCL:
|
|
case BTRFS_QGROUP_OPER_SUB_EXCL:
|
|
ret = qgroup_excl_accounting(fs_info, oper);
|
|
break;
|
|
case BTRFS_QGROUP_OPER_ADD_SHARED:
|
|
case BTRFS_QGROUP_OPER_SUB_SHARED:
|
|
ret = qgroup_shared_accounting(trans, fs_info, oper);
|
|
break;
|
|
case BTRFS_QGROUP_OPER_SUB_SUBTREE:
|
|
ret = qgroup_subtree_accounting(trans, fs_info, oper);
|
|
break;
|
|
default:
|
|
ASSERT(0);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Needs to be called everytime we run delayed refs, even if there is an error
|
|
* in order to cleanup outstanding operations.
|
|
*/
|
|
int btrfs_delayed_qgroup_accounting(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_qgroup_operation *oper;
|
|
int ret = 0;
|
|
|
|
while (!list_empty(&trans->qgroup_ref_list)) {
|
|
oper = list_first_entry(&trans->qgroup_ref_list,
|
|
struct btrfs_qgroup_operation, list);
|
|
list_del_init(&oper->list);
|
|
if (!ret || !trans->aborted)
|
|
ret = btrfs_qgroup_account(trans, fs_info, oper);
|
|
spin_lock(&fs_info->qgroup_op_lock);
|
|
rb_erase(&oper->n, &fs_info->qgroup_op_tree);
|
|
spin_unlock(&fs_info->qgroup_op_lock);
|
|
btrfs_put_tree_mod_seq(fs_info, &oper->elem);
|
|
kfree(oper);
|
|
}
|
|
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;
|
|
int start_rescan_worker = 0;
|
|
|
|
if (!quota_root)
|
|
goto out;
|
|
|
|
if (!fs_info->quota_enabled && fs_info->pending_quota_state)
|
|
start_rescan_worker = 1;
|
|
|
|
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;
|
|
|
|
if (!ret && start_rescan_worker) {
|
|
ret = qgroup_rescan_init(fs_info, 0, 1);
|
|
if (!ret) {
|
|
qgroup_rescan_zero_tracking(fs_info);
|
|
btrfs_queue_work(fs_info->qgroup_rescan_workers,
|
|
&fs_info->qgroup_rescan_work);
|
|
}
|
|
ret = 0;
|
|
}
|
|
|
|
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;
|
|
u64 nums;
|
|
|
|
mutex_lock(&fs_info->qgroup_ioctl_lock);
|
|
if (!fs_info->quota_enabled)
|
|
goto out;
|
|
|
|
if (!quota_root) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (inherit) {
|
|
i_qgroups = (u64 *)(inherit + 1);
|
|
nums = inherit->num_qgroups + 2 * inherit->num_ref_copies +
|
|
2 * inherit->num_excl_copies;
|
|
for (i = 0; i < nums; ++i) {
|
|
srcgroup = find_qgroup_rb(fs_info, *i_qgroups);
|
|
if (!srcgroup) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
++i_qgroups;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
|
|
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();
|
|
level_size = srcroot->nodesize;
|
|
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;
|
|
|
|
/*
|
|
* We call inherit after we clone the root in order to make sure
|
|
* our counts don't go crazy, so at this point the only
|
|
* difference between the two roots should be the root node.
|
|
*/
|
|
dstgroup->rfer = srcgroup->rfer;
|
|
dstgroup->rfer_cmpr = srcgroup->rfer_cmpr;
|
|
dstgroup->excl = level_size;
|
|
dstgroup->excl_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:
|
|
mutex_unlock(&fs_info->qgroup_ioctl_lock);
|
|
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_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_reinit(fs_info->qgroup_ulist);
|
|
ret = ulist_add(fs_info->qgroup_ulist, qgroup->qgroupid,
|
|
(uintptr_t)qgroup, GFP_ATOMIC);
|
|
if (ret < 0)
|
|
goto out;
|
|
ULIST_ITER_INIT(&uiter);
|
|
while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) {
|
|
struct btrfs_qgroup *qg;
|
|
struct btrfs_qgroup_list *glist;
|
|
|
|
qg = u64_to_ptr(unode->aux);
|
|
|
|
if ((qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_RFER) &&
|
|
qg->reserved + (s64)qg->rfer + num_bytes >
|
|
qg->max_rfer) {
|
|
ret = -EDQUOT;
|
|
goto out;
|
|
}
|
|
|
|
if ((qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_EXCL) &&
|
|
qg->reserved + (s64)qg->excl + num_bytes >
|
|
qg->max_excl) {
|
|
ret = -EDQUOT;
|
|
goto out;
|
|
}
|
|
|
|
list_for_each_entry(glist, &qg->groups, next_group) {
|
|
ret = ulist_add(fs_info->qgroup_ulist,
|
|
glist->group->qgroupid,
|
|
(uintptr_t)glist->group, GFP_ATOMIC);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
}
|
|
ret = 0;
|
|
/*
|
|
* no limits exceeded, now record the reservation into all qgroups
|
|
*/
|
|
ULIST_ITER_INIT(&uiter);
|
|
while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) {
|
|
struct btrfs_qgroup *qg;
|
|
|
|
qg = u64_to_ptr(unode->aux);
|
|
|
|
qg->reserved += num_bytes;
|
|
}
|
|
|
|
out:
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
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_node *unode;
|
|
struct ulist_iterator uiter;
|
|
u64 ref_root = root->root_key.objectid;
|
|
int ret = 0;
|
|
|
|
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_reinit(fs_info->qgroup_ulist);
|
|
ret = ulist_add(fs_info->qgroup_ulist, qgroup->qgroupid,
|
|
(uintptr_t)qgroup, GFP_ATOMIC);
|
|
if (ret < 0)
|
|
goto out;
|
|
ULIST_ITER_INIT(&uiter);
|
|
while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) {
|
|
struct btrfs_qgroup *qg;
|
|
struct btrfs_qgroup_list *glist;
|
|
|
|
qg = u64_to_ptr(unode->aux);
|
|
|
|
qg->reserved -= num_bytes;
|
|
|
|
list_for_each_entry(glist, &qg->groups, next_group) {
|
|
ret = ulist_add(fs_info->qgroup_ulist,
|
|
glist->group->qgroupid,
|
|
(uintptr_t)glist->group, GFP_ATOMIC);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
out:
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
}
|
|
|
|
void assert_qgroups_uptodate(struct btrfs_trans_handle *trans)
|
|
{
|
|
if (list_empty(&trans->qgroup_ref_list) && !trans->delayed_ref_elem.seq)
|
|
return;
|
|
btrfs_err(trans->root->fs_info,
|
|
"qgroups not uptodate in trans handle %p: list is%s empty, "
|
|
"seq is %#x.%x",
|
|
trans, list_empty(&trans->qgroup_ref_list) ? "" : " not",
|
|
(u32)(trans->delayed_ref_elem.seq >> 32),
|
|
(u32)trans->delayed_ref_elem.seq);
|
|
BUG();
|
|
}
|
|
|
|
/*
|
|
* returns < 0 on error, 0 when more leafs are to be scanned.
|
|
* returns 1 when done, 2 when done and FLAG_INCONSISTENT was cleared.
|
|
*/
|
|
static int
|
|
qgroup_rescan_leaf(struct btrfs_fs_info *fs_info, struct btrfs_path *path,
|
|
struct btrfs_trans_handle *trans, struct ulist *qgroups,
|
|
struct ulist *tmp, struct extent_buffer *scratch_leaf)
|
|
{
|
|
struct btrfs_key found;
|
|
struct ulist *roots = NULL;
|
|
struct seq_list tree_mod_seq_elem = {};
|
|
u64 num_bytes;
|
|
u64 seq;
|
|
int new_roots;
|
|
int slot;
|
|
int ret;
|
|
|
|
path->leave_spinning = 1;
|
|
mutex_lock(&fs_info->qgroup_rescan_lock);
|
|
ret = btrfs_search_slot_for_read(fs_info->extent_root,
|
|
&fs_info->qgroup_rescan_progress,
|
|
path, 1, 0);
|
|
|
|
pr_debug("current progress key (%llu %u %llu), search_slot ret %d\n",
|
|
fs_info->qgroup_rescan_progress.objectid,
|
|
fs_info->qgroup_rescan_progress.type,
|
|
fs_info->qgroup_rescan_progress.offset, ret);
|
|
|
|
if (ret) {
|
|
/*
|
|
* The rescan is about to end, we will not be scanning any
|
|
* further blocks. We cannot unset the RESCAN flag here, because
|
|
* we want to commit the transaction if everything went well.
|
|
* To make the live accounting work in this phase, we set our
|
|
* scan progress pointer such that every real extent objectid
|
|
* will be smaller.
|
|
*/
|
|
fs_info->qgroup_rescan_progress.objectid = (u64)-1;
|
|
btrfs_release_path(path);
|
|
mutex_unlock(&fs_info->qgroup_rescan_lock);
|
|
return ret;
|
|
}
|
|
|
|
btrfs_item_key_to_cpu(path->nodes[0], &found,
|
|
btrfs_header_nritems(path->nodes[0]) - 1);
|
|
fs_info->qgroup_rescan_progress.objectid = found.objectid + 1;
|
|
|
|
btrfs_get_tree_mod_seq(fs_info, &tree_mod_seq_elem);
|
|
memcpy(scratch_leaf, path->nodes[0], sizeof(*scratch_leaf));
|
|
slot = path->slots[0];
|
|
btrfs_release_path(path);
|
|
mutex_unlock(&fs_info->qgroup_rescan_lock);
|
|
|
|
for (; slot < btrfs_header_nritems(scratch_leaf); ++slot) {
|
|
btrfs_item_key_to_cpu(scratch_leaf, &found, slot);
|
|
if (found.type != BTRFS_EXTENT_ITEM_KEY &&
|
|
found.type != BTRFS_METADATA_ITEM_KEY)
|
|
continue;
|
|
if (found.type == BTRFS_METADATA_ITEM_KEY)
|
|
num_bytes = fs_info->extent_root->nodesize;
|
|
else
|
|
num_bytes = found.offset;
|
|
|
|
ulist_reinit(qgroups);
|
|
ret = btrfs_find_all_roots(NULL, fs_info, found.objectid, 0,
|
|
&roots);
|
|
if (ret < 0)
|
|
goto out;
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
seq = fs_info->qgroup_seq;
|
|
fs_info->qgroup_seq += roots->nnodes + 1; /* max refcnt */
|
|
|
|
new_roots = 0;
|
|
ret = qgroup_calc_old_refcnt(fs_info, 0, tmp, roots, qgroups,
|
|
seq, &new_roots, 1);
|
|
if (ret < 0) {
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
ulist_free(roots);
|
|
goto out;
|
|
}
|
|
|
|
ret = qgroup_adjust_counters(fs_info, 0, num_bytes, qgroups,
|
|
seq, 0, new_roots, 1);
|
|
if (ret < 0) {
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
ulist_free(roots);
|
|
goto out;
|
|
}
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
ulist_free(roots);
|
|
}
|
|
out:
|
|
btrfs_put_tree_mod_seq(fs_info, &tree_mod_seq_elem);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void btrfs_qgroup_rescan_worker(struct btrfs_work *work)
|
|
{
|
|
struct btrfs_fs_info *fs_info = container_of(work, struct btrfs_fs_info,
|
|
qgroup_rescan_work);
|
|
struct btrfs_path *path;
|
|
struct btrfs_trans_handle *trans = NULL;
|
|
struct ulist *tmp = NULL, *qgroups = NULL;
|
|
struct extent_buffer *scratch_leaf = NULL;
|
|
int err = -ENOMEM;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
goto out;
|
|
qgroups = ulist_alloc(GFP_NOFS);
|
|
if (!qgroups)
|
|
goto out;
|
|
tmp = ulist_alloc(GFP_NOFS);
|
|
if (!tmp)
|
|
goto out;
|
|
scratch_leaf = kmalloc(sizeof(*scratch_leaf), GFP_NOFS);
|
|
if (!scratch_leaf)
|
|
goto out;
|
|
|
|
err = 0;
|
|
while (!err) {
|
|
trans = btrfs_start_transaction(fs_info->fs_root, 0);
|
|
if (IS_ERR(trans)) {
|
|
err = PTR_ERR(trans);
|
|
break;
|
|
}
|
|
if (!fs_info->quota_enabled) {
|
|
err = -EINTR;
|
|
} else {
|
|
err = qgroup_rescan_leaf(fs_info, path, trans,
|
|
qgroups, tmp, scratch_leaf);
|
|
}
|
|
if (err > 0)
|
|
btrfs_commit_transaction(trans, fs_info->fs_root);
|
|
else
|
|
btrfs_end_transaction(trans, fs_info->fs_root);
|
|
}
|
|
|
|
out:
|
|
kfree(scratch_leaf);
|
|
ulist_free(qgroups);
|
|
ulist_free(tmp);
|
|
btrfs_free_path(path);
|
|
|
|
mutex_lock(&fs_info->qgroup_rescan_lock);
|
|
fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN;
|
|
|
|
if (err == 2 &&
|
|
fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT) {
|
|
fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
|
|
} else if (err < 0) {
|
|
fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
|
|
}
|
|
mutex_unlock(&fs_info->qgroup_rescan_lock);
|
|
|
|
if (err >= 0) {
|
|
btrfs_info(fs_info, "qgroup scan completed%s",
|
|
err == 2 ? " (inconsistency flag cleared)" : "");
|
|
} else {
|
|
btrfs_err(fs_info, "qgroup scan failed with %d", err);
|
|
}
|
|
|
|
complete_all(&fs_info->qgroup_rescan_completion);
|
|
}
|
|
|
|
/*
|
|
* Checks that (a) no rescan is running and (b) quota is enabled. Allocates all
|
|
* memory required for the rescan context.
|
|
*/
|
|
static int
|
|
qgroup_rescan_init(struct btrfs_fs_info *fs_info, u64 progress_objectid,
|
|
int init_flags)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (!init_flags &&
|
|
(!(fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) ||
|
|
!(fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_ON))) {
|
|
ret = -EINVAL;
|
|
goto err;
|
|
}
|
|
|
|
mutex_lock(&fs_info->qgroup_rescan_lock);
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
|
|
if (init_flags) {
|
|
if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN)
|
|
ret = -EINPROGRESS;
|
|
else if (!(fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_ON))
|
|
ret = -EINVAL;
|
|
|
|
if (ret) {
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
mutex_unlock(&fs_info->qgroup_rescan_lock);
|
|
goto err;
|
|
}
|
|
|
|
fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_RESCAN;
|
|
}
|
|
|
|
memset(&fs_info->qgroup_rescan_progress, 0,
|
|
sizeof(fs_info->qgroup_rescan_progress));
|
|
fs_info->qgroup_rescan_progress.objectid = progress_objectid;
|
|
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
mutex_unlock(&fs_info->qgroup_rescan_lock);
|
|
|
|
init_completion(&fs_info->qgroup_rescan_completion);
|
|
|
|
memset(&fs_info->qgroup_rescan_work, 0,
|
|
sizeof(fs_info->qgroup_rescan_work));
|
|
btrfs_init_work(&fs_info->qgroup_rescan_work,
|
|
btrfs_qgroup_rescan_helper,
|
|
btrfs_qgroup_rescan_worker, NULL, NULL);
|
|
|
|
if (ret) {
|
|
err:
|
|
btrfs_info(fs_info, "qgroup_rescan_init failed with %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
qgroup_rescan_zero_tracking(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct rb_node *n;
|
|
struct btrfs_qgroup *qgroup;
|
|
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
/* clear all current qgroup tracking information */
|
|
for (n = rb_first(&fs_info->qgroup_tree); n; n = rb_next(n)) {
|
|
qgroup = rb_entry(n, struct btrfs_qgroup, node);
|
|
qgroup->rfer = 0;
|
|
qgroup->rfer_cmpr = 0;
|
|
qgroup->excl = 0;
|
|
qgroup->excl_cmpr = 0;
|
|
}
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
}
|
|
|
|
int
|
|
btrfs_qgroup_rescan(struct btrfs_fs_info *fs_info)
|
|
{
|
|
int ret = 0;
|
|
struct btrfs_trans_handle *trans;
|
|
|
|
ret = qgroup_rescan_init(fs_info, 0, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* We have set the rescan_progress to 0, which means no more
|
|
* delayed refs will be accounted by btrfs_qgroup_account_ref.
|
|
* However, btrfs_qgroup_account_ref may be right after its call
|
|
* to btrfs_find_all_roots, in which case it would still do the
|
|
* accounting.
|
|
* To solve this, we're committing the transaction, which will
|
|
* ensure we run all delayed refs and only after that, we are
|
|
* going to clear all tracking information for a clean start.
|
|
*/
|
|
|
|
trans = btrfs_join_transaction(fs_info->fs_root);
|
|
if (IS_ERR(trans)) {
|
|
fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN;
|
|
return PTR_ERR(trans);
|
|
}
|
|
ret = btrfs_commit_transaction(trans, fs_info->fs_root);
|
|
if (ret) {
|
|
fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN;
|
|
return ret;
|
|
}
|
|
|
|
qgroup_rescan_zero_tracking(fs_info);
|
|
|
|
btrfs_queue_work(fs_info->qgroup_rescan_workers,
|
|
&fs_info->qgroup_rescan_work);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_qgroup_wait_for_completion(struct btrfs_fs_info *fs_info)
|
|
{
|
|
int running;
|
|
int ret = 0;
|
|
|
|
mutex_lock(&fs_info->qgroup_rescan_lock);
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
running = fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN;
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
mutex_unlock(&fs_info->qgroup_rescan_lock);
|
|
|
|
if (running)
|
|
ret = wait_for_completion_interruptible(
|
|
&fs_info->qgroup_rescan_completion);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* this is only called from open_ctree where we're still single threaded, thus
|
|
* locking is omitted here.
|
|
*/
|
|
void
|
|
btrfs_qgroup_rescan_resume(struct btrfs_fs_info *fs_info)
|
|
{
|
|
if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN)
|
|
btrfs_queue_work(fs_info->qgroup_rescan_workers,
|
|
&fs_info->qgroup_rescan_work);
|
|
}
|