qgroup.c 70.7 KB
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/*
 * Copyright (C) 2011 STRATO.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License v2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

#include <linux/sched.h>
#include <linux/pagemap.h>
#include <linux/writeback.h>
#include <linux/blkdev.h>
#include <linux/rbtree.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
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#include <linux/btrfs.h>
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#include "ctree.h"
#include "transaction.h"
#include "disk-io.h"
#include "locking.h"
#include "ulist.h"
#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
 *  - subvol delete -> delete when ref goes to 0? delete limits also?
 *  - reorganize keys
 *  - compressed
 *  - sync
 *  - copy also limits on subvol creation
 *  - limit
 *  - caches fuer ulists
 *  - performance benchmarks
 *  - check all ioctl parameters
 */

/*
 * one struct for each qgroup, organized in fs_info->qgroup_tree.
 */
struct btrfs_qgroup {
	u64 qgroupid;

	/*
	 * state
	 */
	u64 rfer;	/* referenced */
	u64 rfer_cmpr;	/* referenced compressed */
	u64 excl;	/* exclusive */
	u64 excl_cmpr;	/* exclusive compressed */

	/*
	 * limits
	 */
	u64 lim_flags;	/* which limits are set */
	u64 max_rfer;
	u64 max_excl;
	u64 rsv_rfer;
	u64 rsv_excl;

	/*
	 * reservation tracking
	 */
	u64 reserved;

	/*
	 * lists
	 */
	struct list_head groups;  /* groups this group is member of */
	struct list_head members; /* groups that are members of this group */
	struct list_head dirty;   /* dirty groups */
	struct rb_node node;	  /* tree of qgroups */

	/*
	 * temp variables for accounting operations
	 */
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	u64 old_refcnt;
	u64 new_refcnt;
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};

/*
 * glue structure to represent the relations between qgroups.
 */
struct btrfs_qgroup_list {
	struct list_head next_group;
	struct list_head next_member;
	struct btrfs_qgroup *group;
	struct btrfs_qgroup *member;
};

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#define ptr_to_u64(x) ((u64)(uintptr_t)x)
#define u64_to_ptr(x) ((struct btrfs_qgroup *)(uintptr_t)x)

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static int
qgroup_rescan_init(struct btrfs_fs_info *fs_info, u64 progress_objectid,
		   int init_flags);
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,
					   u64 qgroupid)
{
	struct rb_node *n = fs_info->qgroup_tree.rb_node;
	struct btrfs_qgroup *qgroup;

	while (n) {
		qgroup = rb_entry(n, struct btrfs_qgroup, node);
		if (qgroup->qgroupid < qgroupid)
			n = n->rb_left;
		else if (qgroup->qgroupid > qgroupid)
			n = n->rb_right;
		else
			return qgroup;
	}
	return NULL;
}

/* must be called with qgroup_lock held */
static struct btrfs_qgroup *add_qgroup_rb(struct btrfs_fs_info *fs_info,
					  u64 qgroupid)
{
	struct rb_node **p = &fs_info->qgroup_tree.rb_node;
	struct rb_node *parent = NULL;
	struct btrfs_qgroup *qgroup;

	while (*p) {
		parent = *p;
		qgroup = rb_entry(parent, struct btrfs_qgroup, node);

		if (qgroup->qgroupid < qgroupid)
			p = &(*p)->rb_left;
		else if (qgroup->qgroupid > qgroupid)
			p = &(*p)->rb_right;
		else
			return qgroup;
	}

	qgroup = kzalloc(sizeof(*qgroup), GFP_ATOMIC);
	if (!qgroup)
		return ERR_PTR(-ENOMEM);

	qgroup->qgroupid = qgroupid;
	INIT_LIST_HEAD(&qgroup->groups);
	INIT_LIST_HEAD(&qgroup->members);
	INIT_LIST_HEAD(&qgroup->dirty);

	rb_link_node(&qgroup->node, parent, p);
	rb_insert_color(&qgroup->node, &fs_info->qgroup_tree);

	return qgroup;
}

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static void __del_qgroup_rb(struct btrfs_qgroup *qgroup)
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{
	struct btrfs_qgroup_list *list;

	list_del(&qgroup->dirty);
	while (!list_empty(&qgroup->groups)) {
		list = list_first_entry(&qgroup->groups,
					struct btrfs_qgroup_list, next_group);
		list_del(&list->next_group);
		list_del(&list->next_member);
		kfree(list);
	}

	while (!list_empty(&qgroup->members)) {
		list = list_first_entry(&qgroup->members,
					struct btrfs_qgroup_list, next_member);
		list_del(&list->next_group);
		list_del(&list->next_member);
		kfree(list);
	}
	kfree(qgroup);
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}
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/* must be called with qgroup_lock held */
static int del_qgroup_rb(struct btrfs_fs_info *fs_info, u64 qgroupid)
{
	struct btrfs_qgroup *qgroup = find_qgroup_rb(fs_info, qgroupid);

	if (!qgroup)
		return -ENOENT;

	rb_erase(&qgroup->node, &fs_info->qgroup_tree);
	__del_qgroup_rb(qgroup);
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	return 0;
}

/* must be called with qgroup_lock held */
static int add_relation_rb(struct btrfs_fs_info *fs_info,
			   u64 memberid, u64 parentid)
{
	struct btrfs_qgroup *member;
	struct btrfs_qgroup *parent;
	struct btrfs_qgroup_list *list;

	member = find_qgroup_rb(fs_info, memberid);
	parent = find_qgroup_rb(fs_info, parentid);
	if (!member || !parent)
		return -ENOENT;

	list = kzalloc(sizeof(*list), GFP_ATOMIC);
	if (!list)
		return -ENOMEM;

	list->group = parent;
	list->member = member;
	list_add_tail(&list->next_group, &member->groups);
	list_add_tail(&list->next_member, &parent->members);

	return 0;
}

/* must be called with qgroup_lock held */
static int del_relation_rb(struct btrfs_fs_info *fs_info,
			   u64 memberid, u64 parentid)
{
	struct btrfs_qgroup *member;
	struct btrfs_qgroup *parent;
	struct btrfs_qgroup_list *list;

	member = find_qgroup_rb(fs_info, memberid);
	parent = find_qgroup_rb(fs_info, parentid);
	if (!member || !parent)
		return -ENOENT;

	list_for_each_entry(list, &member->groups, next_group) {
		if (list->group == parent) {
			list_del(&list->next_group);
			list_del(&list->next_member);
			kfree(list);
			return 0;
		}
	}
	return -ENOENT;
}

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#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
int btrfs_verify_qgroup_counts(struct btrfs_fs_info *fs_info, u64 qgroupid,
			       u64 rfer, u64 excl)
{
	struct btrfs_qgroup *qgroup;

	qgroup = find_qgroup_rb(fs_info, qgroupid);
	if (!qgroup)
		return -EINVAL;
	if (qgroup->rfer != rfer || qgroup->excl != excl)
		return -EINVAL;
	return 0;
}
#endif

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/*
 * The full config is read in one go, only called from open_ctree()
 * It doesn't use any locking, as at this point we're still single-threaded
 */
int btrfs_read_qgroup_config(struct btrfs_fs_info *fs_info)
{
	struct btrfs_key key;
	struct btrfs_key found_key;
	struct btrfs_root *quota_root = fs_info->quota_root;
	struct btrfs_path *path = NULL;
	struct extent_buffer *l;
	int slot;
	int ret = 0;
	u64 flags = 0;
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	u64 rescan_progress = 0;
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	if (!fs_info->quota_enabled)
		return 0;

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	fs_info->qgroup_ulist = ulist_alloc(GFP_NOFS);
	if (!fs_info->qgroup_ulist) {
		ret = -ENOMEM;
		goto out;
	}

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	path = btrfs_alloc_path();
	if (!path) {
		ret = -ENOMEM;
		goto out;
	}

	/* default this to quota off, in case no status key is found */
	fs_info->qgroup_flags = 0;

	/*
	 * pass 1: read status, all qgroup infos and limits
	 */
	key.objectid = 0;
	key.type = 0;
	key.offset = 0;
	ret = btrfs_search_slot_for_read(quota_root, &key, path, 1, 1);
	if (ret)
		goto out;

	while (1) {
		struct btrfs_qgroup *qgroup;

		slot = path->slots[0];
		l = path->nodes[0];
		btrfs_item_key_to_cpu(l, &found_key, slot);

		if (found_key.type == BTRFS_QGROUP_STATUS_KEY) {
			struct btrfs_qgroup_status_item *ptr;

			ptr = btrfs_item_ptr(l, slot,
					     struct btrfs_qgroup_status_item);

			if (btrfs_qgroup_status_version(l, ptr) !=
			    BTRFS_QGROUP_STATUS_VERSION) {
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				btrfs_err(fs_info,
				 "old qgroup version, quota disabled");
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				goto out;
			}
			if (btrfs_qgroup_status_generation(l, ptr) !=
			    fs_info->generation) {
				flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
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				btrfs_err(fs_info,
					"qgroup generation mismatch, "
					"marked as inconsistent");
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			}
			fs_info->qgroup_flags = btrfs_qgroup_status_flags(l,
									  ptr);
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			rescan_progress = btrfs_qgroup_status_rescan(l, ptr);
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			goto next1;
		}

		if (found_key.type != BTRFS_QGROUP_INFO_KEY &&
		    found_key.type != BTRFS_QGROUP_LIMIT_KEY)
			goto next1;

		qgroup = find_qgroup_rb(fs_info, found_key.offset);
		if ((qgroup && found_key.type == BTRFS_QGROUP_INFO_KEY) ||
		    (!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;
		}
		if (!qgroup) {
			qgroup = add_qgroup_rb(fs_info, found_key.offset);
			if (IS_ERR(qgroup)) {
				ret = PTR_ERR(qgroup);
				goto out;
			}
		}
		switch (found_key.type) {
		case BTRFS_QGROUP_INFO_KEY: {
			struct btrfs_qgroup_info_item *ptr;

			ptr = btrfs_item_ptr(l, slot,
					     struct btrfs_qgroup_info_item);
			qgroup->rfer = btrfs_qgroup_info_rfer(l, ptr);
			qgroup->rfer_cmpr = btrfs_qgroup_info_rfer_cmpr(l, ptr);
			qgroup->excl = btrfs_qgroup_info_excl(l, ptr);
			qgroup->excl_cmpr = btrfs_qgroup_info_excl_cmpr(l, ptr);
			/* generation currently unused */
			break;
		}
		case BTRFS_QGROUP_LIMIT_KEY: {
			struct btrfs_qgroup_limit_item *ptr;

			ptr = btrfs_item_ptr(l, slot,
					     struct btrfs_qgroup_limit_item);
			qgroup->lim_flags = btrfs_qgroup_limit_flags(l, ptr);
			qgroup->max_rfer = btrfs_qgroup_limit_max_rfer(l, ptr);
			qgroup->max_excl = btrfs_qgroup_limit_max_excl(l, ptr);
			qgroup->rsv_rfer = btrfs_qgroup_limit_rsv_rfer(l, ptr);
			qgroup->rsv_excl = btrfs_qgroup_limit_rsv_excl(l, ptr);
			break;
		}
		}
next1:
		ret = btrfs_next_item(quota_root, path);
		if (ret < 0)
			goto out;
		if (ret)
			break;
	}
	btrfs_release_path(path);

	/*
	 * pass 2: read all qgroup relations
	 */
	key.objectid = 0;
	key.type = BTRFS_QGROUP_RELATION_KEY;
	key.offset = 0;
	ret = btrfs_search_slot_for_read(quota_root, &key, path, 1, 0);
	if (ret)
		goto out;
	while (1) {
		slot = path->slots[0];
		l = path->nodes[0];
		btrfs_item_key_to_cpu(l, &found_key, slot);

		if (found_key.type != BTRFS_QGROUP_RELATION_KEY)
			goto next2;

		if (found_key.objectid > found_key.offset) {
			/* parent <- member, not needed to build config */
			/* FIXME should we omit the key completely? */
			goto next2;
		}

		ret = add_relation_rb(fs_info, found_key.objectid,
				      found_key.offset);
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		if (ret == -ENOENT) {
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			btrfs_warn(fs_info,
				"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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		if (ret)
			goto out;
next2:
		ret = btrfs_next_item(quota_root, path);
		if (ret < 0)
			goto out;
		if (ret)
			break;
	}
out:
	fs_info->qgroup_flags |= flags;
	if (!(fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_ON)) {
		fs_info->quota_enabled = 0;
		fs_info->pending_quota_state = 0;
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	} else if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN &&
		   ret >= 0) {
		ret = qgroup_rescan_init(fs_info, rescan_progress, 0);
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	}
	btrfs_free_path(path);

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	if (ret < 0) {
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		ulist_free(fs_info->qgroup_ulist);
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		fs_info->qgroup_ulist = NULL;
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		fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN;
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	}
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	return ret < 0 ? ret : 0;
}

/*
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 * 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.
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 */
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);
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		__del_qgroup_rb(qgroup);
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	}
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	/*
	 * 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.
	 */
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	ulist_free(fs_info->qgroup_ulist);
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	fs_info->qgroup_ulist = NULL;
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}

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;

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#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
	if (unlikely(test_bit(BTRFS_ROOT_DUMMY_ROOT, &quota_root->state)))
		return 0;
#endif
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	path = btrfs_alloc_path();
	if (!path)
		return -ENOMEM;

	key.objectid = 0;
	key.type = BTRFS_QGROUP_INFO_KEY;
	key.offset = qgroupid;

	ret = btrfs_insert_empty_item(trans, quota_root, path, &key,
				      sizeof(*qgroup_info));
	if (ret)
		goto out;

	leaf = path->nodes[0];
	qgroup_info = btrfs_item_ptr(leaf, path->slots[0],
				 struct btrfs_qgroup_info_item);
	btrfs_set_qgroup_info_generation(leaf, qgroup_info, trans->transid);
	btrfs_set_qgroup_info_rfer(leaf, qgroup_info, 0);
	btrfs_set_qgroup_info_rfer_cmpr(leaf, qgroup_info, 0);
	btrfs_set_qgroup_info_excl(leaf, qgroup_info, 0);
	btrfs_set_qgroup_info_excl_cmpr(leaf, qgroup_info, 0);

	btrfs_mark_buffer_dirty(leaf);

	btrfs_release_path(path);

	key.type = BTRFS_QGROUP_LIMIT_KEY;
	ret = btrfs_insert_empty_item(trans, quota_root, path, &key,
				      sizeof(*qgroup_limit));
	if (ret)
		goto out;

	leaf = path->nodes[0];
	qgroup_limit = btrfs_item_ptr(leaf, path->slots[0],
				  struct btrfs_qgroup_limit_item);
	btrfs_set_qgroup_limit_flags(leaf, qgroup_limit, 0);
	btrfs_set_qgroup_limit_max_rfer(leaf, qgroup_limit, 0);
	btrfs_set_qgroup_limit_max_excl(leaf, qgroup_limit, 0);
	btrfs_set_qgroup_limit_rsv_rfer(leaf, qgroup_limit, 0);
	btrfs_set_qgroup_limit_rsv_excl(leaf, qgroup_limit, 0);

	btrfs_mark_buffer_dirty(leaf);

	ret = 0;
out:
	btrfs_free_path(path);
	return ret;
}

static int del_qgroup_item(struct btrfs_trans_handle *trans,
			   struct btrfs_root *quota_root, u64 qgroupid)
{
	int ret;
	struct btrfs_path *path;
	struct btrfs_key key;

	path = btrfs_alloc_path();
	if (!path)
		return -ENOMEM;

	key.objectid = 0;
	key.type = BTRFS_QGROUP_INFO_KEY;
	key.offset = qgroupid;
	ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1);
	if (ret < 0)
		goto out;

	if (ret > 0) {
		ret = -ENOENT;
		goto out;
	}

	ret = btrfs_del_item(trans, quota_root, path);
	if (ret)
		goto out;

	btrfs_release_path(path);

	key.type = BTRFS_QGROUP_LIMIT_KEY;
	ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1);
	if (ret < 0)
		goto out;

	if (ret > 0) {
		ret = -ENOENT;
		goto out;
	}

	ret = btrfs_del_item(trans, quota_root, path);

out:
	btrfs_free_path(path);
	return ret;
}

static int update_qgroup_limit_item(struct btrfs_trans_handle *trans,
				    struct btrfs_root *root, u64 qgroupid,
				    u64 flags, u64 max_rfer, u64 max_excl,
				    u64 rsv_rfer, u64 rsv_excl)
{
	struct btrfs_path *path;
	struct btrfs_key key;
	struct extent_buffer *l;
	struct btrfs_qgroup_limit_item *qgroup_limit;
	int ret;
	int slot;

	key.objectid = 0;
	key.type = BTRFS_QGROUP_LIMIT_KEY;
	key.offset = qgroupid;

	path = btrfs_alloc_path();
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	if (!path)
		return -ENOMEM;

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	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];
670
	qgroup_limit = btrfs_item_ptr(l, slot, struct btrfs_qgroup_limit_item);
671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694
	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;

695 696 697 698
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
	if (unlikely(test_bit(BTRFS_ROOT_DUMMY_ROOT, &root->state)))
		return 0;
#endif
699 700 701 702 703
	key.objectid = 0;
	key.type = BTRFS_QGROUP_INFO_KEY;
	key.offset = qgroup->qgroupid;

	path = btrfs_alloc_path();
704 705 706
	if (!path)
		return -ENOMEM;

707 708 709 710 711 712 713 714 715
	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];
716
	qgroup_info = btrfs_item_ptr(l, slot, struct btrfs_qgroup_info_item);
717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745
	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();
746 747 748
	if (!path)
		return -ENOMEM;

749 750 751 752 753 754 755 756 757 758 759 760
	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);
J
Jan Schmidt 已提交
761 762
	btrfs_set_qgroup_status_rescan(l, ptr,
				fs_info->qgroup_rescan_progress.objectid);
763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778

	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;
779
	struct extent_buffer *leaf = NULL;
780
	int ret;
781
	int nr = 0;
782 783 784 785 786

	path = btrfs_alloc_path();
	if (!path)
		return -ENOMEM;

787 788 789 790 791
	path->leave_spinning = 1;

	key.objectid = 0;
	key.offset = 0;
	key.type = 0;
792

793
	while (1) {
794
		ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
795 796 797 798 799
		if (ret < 0)
			goto out;
		leaf = path->nodes[0];
		nr = btrfs_header_nritems(leaf);
		if (!nr)
800
			break;
801 802 803 804 805 806 807
		/*
		 * 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);
808 809
		if (ret)
			goto out;
810

811 812 813 814 815 816 817 818 819 820 821 822 823
		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;
824
	struct btrfs_root *tree_root = fs_info->tree_root;
825 826 827 828
	struct btrfs_path *path = NULL;
	struct btrfs_qgroup_status_item *ptr;
	struct extent_buffer *leaf;
	struct btrfs_key key;
829 830
	struct btrfs_key found_key;
	struct btrfs_qgroup *qgroup = NULL;
831
	int ret = 0;
832
	int slot;
833

834
	mutex_lock(&fs_info->qgroup_ioctl_lock);
835 836 837 838 839
	if (fs_info->quota_root) {
		fs_info->pending_quota_state = 1;
		goto out;
	}

840 841 842 843 844 845
	fs_info->qgroup_ulist = ulist_alloc(GFP_NOFS);
	if (!fs_info->qgroup_ulist) {
		ret = -ENOMEM;
		goto out;
	}

846 847 848 849 850 851 852 853 854 855 856
	/*
	 * 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();
857 858 859 860
	if (!path) {
		ret = -ENOMEM;
		goto out_free_root;
	}
861 862 863 864 865 866 867 868

	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)
869
		goto out_free_path;
870 871 872 873 874 875 876 877 878

	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);
J
Jan Schmidt 已提交
879
	btrfs_set_qgroup_status_rescan(leaf, ptr, 0);
880 881 882

	btrfs_mark_buffer_dirty(leaf);

883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929
	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;
	}
930
	spin_lock(&fs_info->qgroup_lock);
931 932 933
	fs_info->quota_root = quota_root;
	fs_info->pending_quota_state = 1;
	spin_unlock(&fs_info->qgroup_lock);
934
out_free_path:
935
	btrfs_free_path(path);
936 937 938 939 940 941 942
out_free_root:
	if (ret) {
		free_extent_buffer(quota_root->node);
		free_extent_buffer(quota_root->commit_root);
		kfree(quota_root);
	}
out:
943
	if (ret) {
944
		ulist_free(fs_info->qgroup_ulist);
945 946
		fs_info->qgroup_ulist = NULL;
	}
947
	mutex_unlock(&fs_info->qgroup_ioctl_lock);
948 949 950 951 952 953 954 955 956 957
	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;

958
	mutex_lock(&fs_info->qgroup_ioctl_lock);
959
	if (!fs_info->quota_root)
960
		goto out;
961
	spin_lock(&fs_info->qgroup_lock);
962 963 964 965 966 967
	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);

968 969
	btrfs_free_qgroup_config(fs_info);

970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988
	ret = btrfs_clean_quota_tree(trans, quota_root);
	if (ret)
		goto out;

	ret = btrfs_del_root(trans, tree_root, &quota_root->root_key);
	if (ret)
		goto out;

	list_del(&quota_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:
989
	mutex_unlock(&fs_info->qgroup_ioctl_lock);
990 991 992
	return ret;
}

J
Jan Schmidt 已提交
993 994
static void qgroup_dirty(struct btrfs_fs_info *fs_info,
			 struct btrfs_qgroup *qgroup)
995
{
J
Jan Schmidt 已提交
996 997
	if (list_empty(&qgroup->dirty))
		list_add(&qgroup->dirty, &fs_info->dirty_qgroups);
998 999 1000 1001 1002 1003
}

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;
1004 1005
	struct btrfs_qgroup *parent;
	struct btrfs_qgroup *member;
1006
	struct btrfs_qgroup_list *list;
1007 1008
	int ret = 0;

1009
	mutex_lock(&fs_info->qgroup_ioctl_lock);
1010
	quota_root = fs_info->quota_root;
1011 1012 1013 1014
	if (!quota_root) {
		ret = -EINVAL;
		goto out;
	}
1015 1016 1017 1018 1019 1020
	member = find_qgroup_rb(fs_info, src);
	parent = find_qgroup_rb(fs_info, dst);
	if (!member || !parent) {
		ret = -EINVAL;
		goto out;
	}
1021

1022 1023 1024 1025 1026 1027 1028 1029
	/* check if such qgroup relation exist firstly */
	list_for_each_entry(list, &member->groups, next_group) {
		if (list->group == parent) {
			ret = -EEXIST;
			goto out;
		}
	}

1030 1031
	ret = add_qgroup_relation_item(trans, quota_root, src, dst);
	if (ret)
1032
		goto out;
1033 1034 1035 1036

	ret = add_qgroup_relation_item(trans, quota_root, dst, src);
	if (ret) {
		del_qgroup_relation_item(trans, quota_root, src, dst);
1037
		goto out;
1038 1039 1040 1041 1042
	}

	spin_lock(&fs_info->qgroup_lock);
	ret = add_relation_rb(quota_root->fs_info, src, dst);
	spin_unlock(&fs_info->qgroup_lock);
1043 1044
out:
	mutex_unlock(&fs_info->qgroup_ioctl_lock);
1045 1046 1047 1048 1049 1050 1051
	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;
1052 1053 1054
	struct btrfs_qgroup *parent;
	struct btrfs_qgroup *member;
	struct btrfs_qgroup_list *list;
1055 1056 1057
	int ret = 0;
	int err;

1058
	mutex_lock(&fs_info->qgroup_ioctl_lock);
1059
	quota_root = fs_info->quota_root;
1060 1061 1062 1063
	if (!quota_root) {
		ret = -EINVAL;
		goto out;
	}
1064

1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079
	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:
1080 1081 1082 1083 1084 1085 1086 1087
	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);
1088 1089
out:
	mutex_unlock(&fs_info->qgroup_ioctl_lock);
1090 1091 1092 1093 1094 1095 1096 1097 1098 1099
	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;

1100
	mutex_lock(&fs_info->qgroup_ioctl_lock);
1101
	quota_root = fs_info->quota_root;
1102 1103 1104 1105
	if (!quota_root) {
		ret = -EINVAL;
		goto out;
	}
1106 1107 1108 1109 1110
	qgroup = find_qgroup_rb(fs_info, qgroupid);
	if (qgroup) {
		ret = -EEXIST;
		goto out;
	}
1111 1112

	ret = add_qgroup_item(trans, quota_root, qgroupid);
1113 1114
	if (ret)
		goto out;
1115 1116 1117 1118 1119 1120 1121

	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);
1122 1123
out:
	mutex_unlock(&fs_info->qgroup_ioctl_lock);
1124 1125 1126 1127 1128 1129 1130
	return ret;
}

int btrfs_remove_qgroup(struct btrfs_trans_handle *trans,
			struct btrfs_fs_info *fs_info, u64 qgroupid)
{
	struct btrfs_root *quota_root;
1131
	struct btrfs_qgroup *qgroup;
1132 1133
	int ret = 0;

1134
	mutex_lock(&fs_info->qgroup_ioctl_lock);
1135
	quota_root = fs_info->quota_root;
1136 1137 1138 1139
	if (!quota_root) {
		ret = -EINVAL;
		goto out;
	}
1140

1141
	qgroup = find_qgroup_rb(fs_info, qgroupid);
1142 1143 1144 1145 1146 1147 1148
	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)) {
1149 1150
			ret = -EBUSY;
			goto out;
1151 1152
		}
	}
1153 1154 1155 1156 1157
	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);
1158 1159
out:
	mutex_unlock(&fs_info->qgroup_ioctl_lock);
1160 1161 1162 1163 1164 1165 1166
	return ret;
}

int btrfs_limit_qgroup(struct btrfs_trans_handle *trans,
		       struct btrfs_fs_info *fs_info, u64 qgroupid,
		       struct btrfs_qgroup_limit *limit)
{
1167
	struct btrfs_root *quota_root;
1168 1169 1170
	struct btrfs_qgroup *qgroup;
	int ret = 0;

1171 1172 1173 1174 1175 1176
	mutex_lock(&fs_info->qgroup_ioctl_lock);
	quota_root = fs_info->quota_root;
	if (!quota_root) {
		ret = -EINVAL;
		goto out;
	}
1177

1178 1179 1180 1181 1182
	qgroup = find_qgroup_rb(fs_info, qgroupid);
	if (!qgroup) {
		ret = -ENOENT;
		goto out;
	}
1183 1184 1185 1186 1187 1188
	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;
1189
		btrfs_info(fs_info, "unable to update quota limit for %llu",
1190
		       qgroupid);
1191 1192
	}

1193
	spin_lock(&fs_info->qgroup_lock);
1194 1195 1196 1197 1198 1199
	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);
1200 1201
out:
	mutex_unlock(&fs_info->qgroup_ioctl_lock);
1202 1203
	return ret;
}
1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247

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;
}

J
Josef Bacik 已提交
1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297
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;
}
1298 1299

/*
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 * 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.
1314 1315
 */
int btrfs_qgroup_record_ref(struct btrfs_trans_handle *trans,
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			    struct btrfs_fs_info *fs_info, u64 ref_root,
			    u64 bytenr, u64 num_bytes,
			    enum btrfs_qgroup_operation_type type, int mod_seq)
1319
{
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	struct btrfs_qgroup_operation *oper;
	int ret;
1322

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1323 1324 1325 1326 1327
	if (!is_fstree(ref_root) || !fs_info->quota_enabled)
		return 0;

	oper = kmalloc(sizeof(*oper), GFP_NOFS);
	if (!oper)
1328 1329
		return -ENOMEM;

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	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;
1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353

	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;
		}
	}

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	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);
1365 1366 1367 1368

	return 0;
}

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/*
 * 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;
		qgroup->excl += sign * oper->num_bytes;
		if (sign < 0)
			WARN_ON(qgroup->excl < 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)
1457 1458 1459 1460 1461 1462 1463 1464 1465 1466
{
	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))) {
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1467 1468 1469
		/* We don't count our current root here */
		if (unode->val == root_to_skip)
			continue;
1470 1471 1472
		qg = find_qgroup_rb(fs_info, unode->val);
		if (!qg)
			continue;
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1473 1474 1475 1476 1477 1478 1479 1480 1481 1482
		/*
		 * 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)++;
1483 1484

		ulist_reinit(tmp);
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		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);
1490 1491 1492 1493 1494 1495
		if (ret < 0)
			return ret;
		ULIST_ITER_INIT(&tmp_uiter);
		while ((tmp_unode = ulist_next(tmp, &tmp_uiter))) {
			struct btrfs_qgroup_list *glist;

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			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;
1513
			else
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				qg->old_refcnt++;
1515

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1516 1517 1518 1519
			if (qg->new_refcnt < seq)
				qg->new_refcnt = seq + 1;
			else
				qg->new_refcnt++;
1520
			list_for_each_entry(glist, &qg->groups, next_group) {
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				ret = ulist_add(qgroups, glist->group->qgroupid,
						ptr_to_u64(glist->group),
						GFP_ATOMIC);
				if (ret < 0)
					return ret;
1526
				ret = ulist_add(tmp, glist->group->qgroupid,
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						ptr_to_u64(glist->group),
1528 1529 1530 1531 1532 1533
						GFP_ATOMIC);
				if (ret < 0)
					return ret;
			}
		}
	}
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	return 0;
}
1536

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1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631
/*
 * 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;
		}
	}
1632 1633 1634
	return 0;
}

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/* 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)
1641 1642 1643 1644 1645 1646 1647
{
	struct ulist_node *unode;
	struct ulist_iterator uiter;
	struct btrfs_qgroup *qg;
	int ret;

	ulist_reinit(tmp);
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	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);
1654 1655 1656 1657
	if (ret < 0)
		return ret;
	ULIST_ITER_INIT(&uiter);
	while ((unode = ulist_next(tmp, &uiter))) {
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		struct btrfs_qgroup_list *glist;
1659

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		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++;
		}
1672 1673
		list_for_each_entry(glist, &qg->groups, next_group) {
			ret = ulist_add(tmp, glist->group->qgroupid,
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1674 1675 1676 1677 1678
					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);
1679 1680 1681 1682 1683 1684 1685
			if (ret < 0)
				return ret;
		}
	}
	return 0;
}

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/*
 * 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)
1693 1694 1695 1696
{
	struct ulist_node *unode;
	struct ulist_iterator uiter;
	struct btrfs_qgroup *qg;
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1697
	u64 cur_new_count, cur_old_count;
1698 1699

	ULIST_ITER_INIT(&uiter);
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1700 1701
	while ((unode = ulist_next(qgroups, &uiter))) {
		bool dirty = false;
1702

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		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;
		}
1713

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		/*
		 * 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;
		}
1723

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1724 1725 1726 1727 1728 1729 1730 1731
		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;
1732

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		/*
		 * 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;
		}
1745

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1746 1747 1748 1749 1750 1751 1752 1753 1754
		/*
		 * 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;
1755 1756
		}

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		if (dirty)
			qgroup_dirty(fs_info, qg);
	}
1760 1761 1762
	return 0;
}

1763
/*
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 * 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.
1767
 */
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static int check_existing_refs(struct btrfs_trans_handle *trans,
			       struct btrfs_fs_info *fs_info,
			       struct btrfs_qgroup_operation *oper)
1771 1772
{
	struct ulist *roots = NULL;
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	struct ulist_node *unode;
	struct ulist_iterator uiter;
1775 1776
	int ret = 0;

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	ret = btrfs_find_all_roots(trans, fs_info, oper->bytenr,
				   oper->elem.seq, &roots);
	if (ret < 0)
		return ret;
	ret = 0;
1782

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	ULIST_ITER_INIT(&uiter);
	while ((unode = ulist_next(roots, &uiter))) {
		if (unode->val == oper->ref_root) {
			ret = 1;
			break;
		}
1789
	}
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1790 1791
	ulist_free(roots);
	btrfs_put_tree_mod_seq(fs_info, &oper->elem);
1792

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	return ret;
}
1795

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/*
 * 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;
1848

J
Josef Bacik 已提交
1849 1850 1851 1852 1853
	if (oper->elem.seq) {
		ret = check_existing_refs(trans, fs_info, oper);
		if (ret < 0)
			return ret;
		if (ret)
J
Jan Schmidt 已提交
1854 1855 1856
			return 0;
	}

J
Josef Bacik 已提交
1857 1858 1859
	qgroups = ulist_alloc(GFP_NOFS);
	if (!qgroups)
		return -ENOMEM;
J
Jan Schmidt 已提交
1860

J
Josef Bacik 已提交
1861
	tmp = ulist_alloc(GFP_NOFS);
1862 1863
	if (!tmp) {
		ulist_free(qgroups);
J
Josef Bacik 已提交
1864
		return -ENOMEM;
1865
	}
1866

J
Josef Bacik 已提交
1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877
	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);
1878
	if (!qgroup)
J
Josef Bacik 已提交
1879 1880
		goto out;
	seq = fs_info->qgroup_seq;
1881 1882

	/*
J
Josef Bacik 已提交
1883 1884 1885 1886 1887 1888
	 * 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...
1889
	 */
J
Josef Bacik 已提交
1890 1891 1892 1893
	ret = qgroup_calc_old_refcnt(fs_info, oper->ref_root, tmp, roots, qgroups,
				     seq, &old_roots, 0);
	if (ret < 0)
		goto out;
1894

J
Josef Bacik 已提交
1895 1896 1897 1898 1899 1900 1901 1902 1903
	/*
	 * 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;
1904 1905

	/*
J
Josef Bacik 已提交
1906 1907 1908 1909 1910 1911 1912 1913
	 * ...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.
1914
	 */
J
Josef Bacik 已提交
1915 1916 1917 1918
	ret = qgroup_account_deleted_refs(fs_info, oper, tmp, qgroups, seq,
					  &old_roots);
	if (ret < 0)
		goto out;
1919 1920

	/*
J
Josef Bacik 已提交
1921 1922
	 * We are adding our root, need to adjust up the number of roots,
	 * otherwise old_roots is the number of roots we want.
1923
	 */
J
Josef Bacik 已提交
1924 1925 1926 1927 1928 1929 1930
	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;
1931

J
Josef Bacik 已提交
1932 1933 1934 1935 1936 1937 1938 1939

	/*
	 * 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:
1940
	spin_unlock(&fs_info->qgroup_lock);
J
Josef Bacik 已提交
1941
	ulist_free(qgroups);
1942
	ulist_free(roots);
J
Josef Bacik 已提交
1943 1944 1945 1946
	ulist_free(tmp);
	return ret;
}

1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961
/*
 * 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;
1962
	int err;
1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975
	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)
1976
		goto out;
1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016

	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) {
2017
		err = ulist_add(parents, glist->group->qgroupid,
2018
				ptr_to_u64(glist->group), GFP_ATOMIC);
2019 2020
		if (err < 0) {
			ret = err;
2021
			goto out_unlock;
2022
		}
2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033
	}

	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) {
2034
			err = ulist_add(parents, glist->group->qgroupid,
2035
					ptr_to_u64(glist->group), GFP_ATOMIC);
2036 2037
			if (err < 0) {
				ret = err;
2038
				goto out_unlock;
2039
			}
2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051
		}
	}

out_unlock:
	spin_unlock(&fs_info->qgroup_lock);

out:
	ulist_free(roots);
	ulist_free(parents);
	return ret;
}

J
Josef Bacik 已提交
2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088
/*
 * 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));

	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;
2089 2090 2091
	case BTRFS_QGROUP_OPER_SUB_SUBTREE:
		ret = qgroup_subtree_accounting(trans, fs_info, oper);
		break;
J
Josef Bacik 已提交
2092 2093 2094 2095 2096
	default:
		ASSERT(0);
	}
	return ret;
}
2097

J
Josef Bacik 已提交
2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119
/*
 * 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);
	}
2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130
	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;
2131
	int start_rescan_worker = 0;
2132 2133 2134 2135

	if (!quota_root)
		goto out;

2136 2137 2138
	if (!fs_info->quota_enabled && fs_info->pending_quota_state)
		start_rescan_worker = 1;

2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163
	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;

2164
	if (!ret && start_rescan_worker) {
2165 2166 2167
		ret = qgroup_rescan_init(fs_info, 0, 1);
		if (!ret) {
			qgroup_rescan_zero_tracking(fs_info);
2168 2169
			btrfs_queue_work(fs_info->qgroup_rescan_workers,
					 &fs_info->qgroup_rescan_work);
2170
		}
2171 2172 2173
		ret = 0;
	}

2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193
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;
2194
	u64 nums;
2195

2196
	mutex_lock(&fs_info->qgroup_ioctl_lock);
2197
	if (!fs_info->quota_enabled)
2198
		goto out;
2199

2200 2201 2202 2203
	if (!quota_root) {
		ret = -EINVAL;
		goto out;
	}
2204

2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218
	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;
		}
	}

2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278
	/*
	 * create a tracking group for the subvol itself
	 */
	ret = add_qgroup_item(trans, quota_root, objectid);
	if (ret)
		goto out;

	if (inherit && inherit->flags & BTRFS_QGROUP_INHERIT_SET_LIMITS) {
		ret = update_qgroup_limit_item(trans, quota_root, objectid,
					       inherit->lim.flags,
					       inherit->lim.max_rfer,
					       inherit->lim.max_excl,
					       inherit->lim.rsv_rfer,
					       inherit->lim.rsv_excl);
		if (ret)
			goto out;
	}

	if (srcid) {
		struct btrfs_root *srcroot;
		struct btrfs_key srckey;
		int srcroot_level;

		srckey.objectid = srcid;
		srckey.type = BTRFS_ROOT_ITEM_KEY;
		srckey.offset = (u64)-1;
		srcroot = btrfs_read_fs_root_no_name(fs_info, &srckey);
		if (IS_ERR(srcroot)) {
			ret = PTR_ERR(srcroot);
			goto out;
		}

		rcu_read_lock();
		srcroot_level = btrfs_header_level(srcroot->node);
		level_size = btrfs_level_size(srcroot, srcroot_level);
		rcu_read_unlock();
	}

	/*
	 * add qgroup to all inherited groups
	 */
	if (inherit) {
		i_qgroups = (u64 *)(inherit + 1);
		for (i = 0; i < inherit->num_qgroups; ++i) {
			ret = add_qgroup_relation_item(trans, quota_root,
						       objectid, *i_qgroups);
			if (ret)
				goto out;
			ret = add_qgroup_relation_item(trans, quota_root,
						       *i_qgroups, objectid);
			if (ret)
				goto out;
			++i_qgroups;
		}
	}


	spin_lock(&fs_info->qgroup_lock);

	dstgroup = add_qgroup_rb(fs_info, objectid);
2279 2280
	if (IS_ERR(dstgroup)) {
		ret = PTR_ERR(dstgroup);
2281
		goto unlock;
2282
	}
2283 2284 2285

	if (srcid) {
		srcgroup = find_qgroup_rb(fs_info, srcid);
2286
		if (!srcgroup)
2287
			goto unlock;
J
Josef Bacik 已提交
2288 2289 2290 2291 2292 2293 2294 2295 2296 2297

		/*
		 * 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;
2298 2299 2300 2301 2302 2303
		srcgroup->excl = level_size;
		srcgroup->excl_cmpr = level_size;
		qgroup_dirty(fs_info, dstgroup);
		qgroup_dirty(fs_info, srcgroup);
	}

2304
	if (!inherit)
2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351
		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:
2352
	mutex_unlock(&fs_info->qgroup_ioctl_lock);
2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390
	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
	 */
2391 2392
	ulist_reinit(fs_info->qgroup_ulist);
	ret = ulist_add(fs_info->qgroup_ulist, qgroup->qgroupid,
2393 2394 2395
			(uintptr_t)qgroup, GFP_ATOMIC);
	if (ret < 0)
		goto out;
2396
	ULIST_ITER_INIT(&uiter);
2397
	while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) {
2398 2399 2400
		struct btrfs_qgroup *qg;
		struct btrfs_qgroup_list *glist;

J
Josef Bacik 已提交
2401
		qg = u64_to_ptr(unode->aux);
2402 2403

		if ((qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_RFER) &&
2404
		    qg->reserved + (s64)qg->rfer + num_bytes >
2405
		    qg->max_rfer) {
2406
			ret = -EDQUOT;
2407 2408
			goto out;
		}
2409 2410

		if ((qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_EXCL) &&
2411
		    qg->reserved + (s64)qg->excl + num_bytes >
2412
		    qg->max_excl) {
2413
			ret = -EDQUOT;
2414 2415
			goto out;
		}
2416 2417

		list_for_each_entry(glist, &qg->groups, next_group) {
2418 2419
			ret = ulist_add(fs_info->qgroup_ulist,
					glist->group->qgroupid,
2420 2421 2422
					(uintptr_t)glist->group, GFP_ATOMIC);
			if (ret < 0)
				goto out;
2423 2424
		}
	}
2425
	ret = 0;
2426 2427 2428 2429
	/*
	 * no limits exceeded, now record the reservation into all qgroups
	 */
	ULIST_ITER_INIT(&uiter);
2430
	while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) {
2431 2432
		struct btrfs_qgroup *qg;

J
Josef Bacik 已提交
2433
		qg = u64_to_ptr(unode->aux);
2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450

		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;
2451
	int ret = 0;
2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468

	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;

2469 2470
	ulist_reinit(fs_info->qgroup_ulist);
	ret = ulist_add(fs_info->qgroup_ulist, qgroup->qgroupid,
2471 2472 2473
			(uintptr_t)qgroup, GFP_ATOMIC);
	if (ret < 0)
		goto out;
2474
	ULIST_ITER_INIT(&uiter);
2475
	while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) {
2476 2477 2478
		struct btrfs_qgroup *qg;
		struct btrfs_qgroup_list *glist;

J
Josef Bacik 已提交
2479
		qg = u64_to_ptr(unode->aux);
2480 2481 2482 2483

		qg->reserved -= num_bytes;

		list_for_each_entry(glist, &qg->groups, next_group) {
2484 2485
			ret = ulist_add(fs_info->qgroup_ulist,
					glist->group->qgroupid,
2486 2487 2488
					(uintptr_t)glist->group, GFP_ATOMIC);
			if (ret < 0)
				goto out;
2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499
		}
	}

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;
2500 2501 2502
	btrfs_err(trans->root->fs_info,
		"qgroups not uptodate in trans handle %p:  list is%s empty, "
		"seq is %#x.%x",
2503
		trans, list_empty(&trans->qgroup_ref_list) ? "" : " not",
2504 2505
		(u32)(trans->delayed_ref_elem.seq >> 32),
		(u32)trans->delayed_ref_elem.seq);
2506 2507
	BUG();
}
J
Jan Schmidt 已提交
2508 2509 2510 2511 2512 2513

/*
 * 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
2514
qgroup_rescan_leaf(struct btrfs_fs_info *fs_info, struct btrfs_path *path,
J
Josef Bacik 已提交
2515 2516
		   struct btrfs_trans_handle *trans, struct ulist *qgroups,
		   struct ulist *tmp, struct extent_buffer *scratch_leaf)
J
Jan Schmidt 已提交
2517 2518 2519 2520
{
	struct btrfs_key found;
	struct ulist *roots = NULL;
	struct seq_list tree_mod_seq_elem = {};
J
Josef Bacik 已提交
2521
	u64 num_bytes;
J
Jan Schmidt 已提交
2522
	u64 seq;
J
Josef Bacik 已提交
2523
	int new_roots;
J
Jan Schmidt 已提交
2524 2525 2526 2527 2528 2529 2530 2531 2532 2533
	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",
2534
		 fs_info->qgroup_rescan_progress.objectid,
J
Jan Schmidt 已提交
2535
		 fs_info->qgroup_rescan_progress.type,
2536
		 fs_info->qgroup_rescan_progress.offset, ret);
J
Jan Schmidt 已提交
2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564

	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);
2565 2566
		if (found.type != BTRFS_EXTENT_ITEM_KEY &&
		    found.type != BTRFS_METADATA_ITEM_KEY)
J
Jan Schmidt 已提交
2567
			continue;
2568 2569 2570 2571 2572
		if (found.type == BTRFS_METADATA_ITEM_KEY)
			num_bytes = fs_info->extent_root->leafsize;
		else
			num_bytes = found.offset;

J
Josef Bacik 已提交
2573 2574 2575
		ulist_reinit(qgroups);
		ret = btrfs_find_all_roots(NULL, fs_info, found.objectid, 0,
					   &roots);
J
Jan Schmidt 已提交
2576 2577 2578 2579 2580 2581
		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 */

J
Josef Bacik 已提交
2582 2583 2584 2585
		new_roots = 0;
		ret = qgroup_calc_old_refcnt(fs_info, 0, tmp, roots, qgroups,
					     seq, &new_roots, 1);
		if (ret < 0) {
J
Jan Schmidt 已提交
2586 2587 2588 2589 2590
			spin_unlock(&fs_info->qgroup_lock);
			ulist_free(roots);
			goto out;
		}

J
Josef Bacik 已提交
2591 2592 2593 2594 2595 2596
		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;
J
Jan Schmidt 已提交
2597 2598 2599 2600 2601 2602 2603 2604 2605 2606
		}
		spin_unlock(&fs_info->qgroup_lock);
		ulist_free(roots);
	}
out:
	btrfs_put_tree_mod_seq(fs_info, &tree_mod_seq_elem);

	return ret;
}

2607
static void btrfs_qgroup_rescan_worker(struct btrfs_work *work)
J
Jan Schmidt 已提交
2608
{
2609 2610
	struct btrfs_fs_info *fs_info = container_of(work, struct btrfs_fs_info,
						     qgroup_rescan_work);
J
Jan Schmidt 已提交
2611 2612
	struct btrfs_path *path;
	struct btrfs_trans_handle *trans = NULL;
J
Josef Bacik 已提交
2613
	struct ulist *tmp = NULL, *qgroups = NULL;
J
Jan Schmidt 已提交
2614 2615 2616 2617 2618 2619
	struct extent_buffer *scratch_leaf = NULL;
	int err = -ENOMEM;

	path = btrfs_alloc_path();
	if (!path)
		goto out;
J
Josef Bacik 已提交
2620 2621 2622
	qgroups = ulist_alloc(GFP_NOFS);
	if (!qgroups)
		goto out;
J
Jan Schmidt 已提交
2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639
	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 {
2640
			err = qgroup_rescan_leaf(fs_info, path, trans,
J
Josef Bacik 已提交
2641
						 qgroups, tmp, scratch_leaf);
J
Jan Schmidt 已提交
2642 2643 2644 2645 2646 2647 2648 2649 2650
		}
		if (err > 0)
			btrfs_commit_transaction(trans, fs_info->fs_root);
		else
			btrfs_end_transaction(trans, fs_info->fs_root);
	}

out:
	kfree(scratch_leaf);
J
Josef Bacik 已提交
2651
	ulist_free(qgroups);
2652
	ulist_free(tmp);
J
Jan Schmidt 已提交
2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666
	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) {
2667
		btrfs_info(fs_info, "qgroup scan completed%s",
J
Jan Schmidt 已提交
2668 2669
			err == 2 ? " (inconsistency flag cleared)" : "");
	} else {
2670
		btrfs_err(fs_info, "qgroup scan failed with %d", err);
J
Jan Schmidt 已提交
2671
	}
2672 2673

	complete_all(&fs_info->qgroup_rescan_completion);
J
Jan Schmidt 已提交
2674 2675
}

2676 2677 2678 2679 2680 2681 2682
/*
 * 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)
J
Jan Schmidt 已提交
2683 2684 2685
{
	int ret = 0;

2686 2687 2688 2689 2690 2691
	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;
	}
J
Jan Schmidt 已提交
2692 2693 2694

	mutex_lock(&fs_info->qgroup_rescan_lock);
	spin_lock(&fs_info->qgroup_lock);
2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708

	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;
J
Jan Schmidt 已提交
2709 2710 2711 2712
	}

	memset(&fs_info->qgroup_rescan_progress, 0,
		sizeof(fs_info->qgroup_rescan_progress));
2713 2714 2715 2716 2717
	fs_info->qgroup_rescan_progress.objectid = progress_objectid;

	spin_unlock(&fs_info->qgroup_lock);
	mutex_unlock(&fs_info->qgroup_rescan_lock);

2718
	init_completion(&fs_info->qgroup_rescan_completion);
J
Jan Schmidt 已提交
2719

2720 2721
	memset(&fs_info->qgroup_rescan_work, 0,
	       sizeof(fs_info->qgroup_rescan_work));
2722 2723
	btrfs_init_work(&fs_info->qgroup_rescan_work,
			btrfs_qgroup_rescan_worker, NULL, NULL);
2724 2725 2726

	if (ret) {
err:
2727
		btrfs_info(fs_info, "qgroup_rescan_init failed with %d", ret);
2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740
		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);
J
Jan Schmidt 已提交
2741 2742 2743 2744 2745 2746 2747 2748 2749
	/* 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);
2750
}
J
Jan Schmidt 已提交
2751

2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785
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);

2786 2787
	btrfs_queue_work(fs_info->qgroup_rescan_workers,
			 &fs_info->qgroup_rescan_work);
J
Jan Schmidt 已提交
2788 2789 2790

	return 0;
}
2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808

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;
}
2809 2810 2811 2812 2813 2814 2815 2816 2817

/*
 * 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)
2818 2819
		btrfs_queue_work(fs_info->qgroup_rescan_workers,
				 &fs_info->qgroup_rescan_work);
2820
}