- 根目录:
- fs
- btrfs
- qgroup.c
/*
* 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>
#include <linux/btrfs.h>
#include "ctree.h"
#include "transaction.h"
#include "disk-io.h"
#include "locking.h"
#include "ulist.h"
#include "backref.h"
#include "extent_io.h"
/* 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
*/
u64 tag;
u64 refcnt;
};
/*
* 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;
};
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);
/* must be called with qgroup_ioctl_lock held */
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;
}
static void __del_qgroup_rb(struct btrfs_qgroup *qgroup)
{
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);
}
/* 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);
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;
}
/*
* 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;
u64 rescan_progress = 0;
if (!fs_info->quota_enabled)
return 0;
fs_info->qgroup_ulist = ulist_alloc(GFP_NOFS);
if (!fs_info->qgroup_ulist) {
ret = -ENOMEM;
goto out;
}
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) {
btrfs_err(fs_info,
"old qgroup version, quota disabled");
goto out;
}
if (btrfs_qgroup_status_generation(l, ptr) !=
fs_info->generation) {
flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
btrfs_err(fs_info,
"qgroup generation mismatch, "
"marked as inconsistent");
}
fs_info->qgroup_flags = btrfs_qgroup_status_flags(l,
ptr);
rescan_progress = btrfs_qgroup_status_rescan(l, ptr);
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)) {
btrfs_err(fs_info, "inconsitent qgroup config");
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);
if (ret == -ENOENT) {
btrfs_warn(fs_info,
"orphan qgroup relation 0x%llx->0x%llx",
found_key.objectid, found_key.offset);
ret = 0; /* ignore the error */
}
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;
} else if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN &&
ret >= 0) {
ret = qgroup_rescan_init(fs_info, rescan_progress, 0);
}
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;
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();
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;
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;
}
/*
* btrfs_qgroup_record_ref is called when the ref is added or deleted. it puts
* the modification into a list that's later used by btrfs_end_transaction to
* pass the recorded modifications on to btrfs_qgroup_account_ref.
*/
int btrfs_qgroup_record_ref(struct btrfs_trans_handle *trans,
struct btrfs_delayed_ref_node *node,
struct btrfs_delayed_extent_op *extent_op)
{
struct qgroup_update *u;
BUG_ON(!trans->delayed_ref_elem.seq);
u = kmalloc(sizeof(*u), GFP_NOFS);
if (!u)
return -ENOMEM;
u->node = node;
u->extent_op = extent_op;
list_add_tail(&u->list, &trans->qgroup_ref_list);
return 0;
}
static int qgroup_account_ref_step1(struct btrfs_fs_info *fs_info,
struct ulist *roots, struct ulist *tmp,
u64 seq)
{
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))) {
qg = find_qgroup_rb(fs_info, unode->val);
if (!qg)
continue;
ulist_reinit(tmp);
/* XXX id not needed */
ret = ulist_add(tmp, qg->qgroupid,
(u64)(uintptr_t)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 = (struct btrfs_qgroup *)(uintptr_t)tmp_unode->aux;
if (qg->refcnt < seq)
qg->refcnt = seq + 1;
else
++qg->refcnt;
list_for_each_entry(glist, &qg->groups, next_group) {
ret = ulist_add(tmp, glist->group->qgroupid,
(u64)(uintptr_t)glist->group,
GFP_ATOMIC);
if (ret < 0)
return ret;
}
}
}
return 0;
}
static int qgroup_account_ref_step2(struct btrfs_fs_info *fs_info,
struct ulist *roots, struct ulist *tmp,
u64 seq, int sgn, u64 num_bytes,
struct btrfs_qgroup *qgroup)
{
struct ulist_node *unode;
struct ulist_iterator uiter;
struct btrfs_qgroup *qg;
struct btrfs_qgroup_list *glist;
int ret;
ulist_reinit(tmp);
ret = ulist_add(tmp, qgroup->qgroupid, (uintptr_t)qgroup, GFP_ATOMIC);
if (ret < 0)
return ret;
ULIST_ITER_INIT(&uiter);
while ((unode = ulist_next(tmp, &uiter))) {
qg = (struct btrfs_qgroup *)(uintptr_t)unode->aux;
if (qg->refcnt < seq) {
/* not visited by step 1 */
qg->rfer += sgn * num_bytes;
qg->rfer_cmpr += sgn * num_bytes;
if (roots->nnodes == 0) {
qg->excl += sgn * num_bytes;
qg->excl_cmpr += sgn * num_bytes;
}
qgroup_dirty(fs_info, qg);
}
WARN_ON(qg->tag >= seq);
qg->tag = seq;
list_for_each_entry(glist, &qg->groups, next_group) {
ret = ulist_add(tmp, glist->group->qgroupid,
(uintptr_t)glist->group, GFP_ATOMIC);
if (ret < 0)
return ret;
}
}
return 0;
}
static int qgroup_account_ref_step3(struct btrfs_fs_info *fs_info,
struct ulist *roots, struct ulist *tmp,
u64 seq, int sgn, u64 num_bytes)
{
struct ulist_node *unode;
struct ulist_iterator uiter;
struct btrfs_qgroup *qg;
struct ulist_node *tmp_unode;
struct ulist_iterator tmp_uiter;
int ret;
ULIST_ITER_INIT(&uiter);
while ((unode = ulist_next(roots, &uiter))) {
qg = find_qgroup_rb(fs_info, unode->val);
if (!qg)
continue;
ulist_reinit(tmp);
ret = ulist_add(tmp, qg->qgroupid, (uintptr_t)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 = (struct btrfs_qgroup *)(uintptr_t)tmp_unode->aux;
if (qg->tag == seq)
continue;
if (qg->refcnt - seq == roots->nnodes) {
qg->excl -= sgn * num_bytes;
qg->excl_cmpr -= sgn * num_bytes;
qgroup_dirty(fs_info, qg);
}
list_for_each_entry(glist, &qg->groups, next_group) {
ret = ulist_add(tmp, glist->group->qgroupid,
(uintptr_t)glist->group,
GFP_ATOMIC);
if (ret < 0)
return ret;
}
}
}
return 0;
}
/*
* btrfs_qgroup_account_ref is called for every ref that is added to or deleted
* from the fs. First, all roots referencing the extent are searched, and
* then the space is accounted accordingly to the different roots. The
* accounting algorithm works in 3 steps documented inline.
*/
int btrfs_qgroup_account_ref(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct btrfs_delayed_ref_node *node,
struct btrfs_delayed_extent_op *extent_op)
{
struct btrfs_root *quota_root;
u64 ref_root;
struct btrfs_qgroup *qgroup;
struct ulist *roots = NULL;
u64 seq;
int ret = 0;
int sgn;
if (!fs_info->quota_enabled)
return 0;
BUG_ON(!fs_info->quota_root);
if (node->type == BTRFS_TREE_BLOCK_REF_KEY ||
node->type == BTRFS_SHARED_BLOCK_REF_KEY) {
struct btrfs_delayed_tree_ref *ref;
ref = btrfs_delayed_node_to_tree_ref(node);
ref_root = ref->root;
} else if (node->type == BTRFS_EXTENT_DATA_REF_KEY ||
node->type == BTRFS_SHARED_DATA_REF_KEY) {
struct btrfs_delayed_data_ref *ref;
ref = btrfs_delayed_node_to_data_ref(node);
ref_root = ref->root;
} else {
BUG();
}
if (!is_fstree(ref_root)) {
/*
* non-fs-trees are not being accounted
*/
return 0;
}
switch (node->action) {
case BTRFS_ADD_DELAYED_REF:
case BTRFS_ADD_DELAYED_EXTENT:
sgn = 1;
seq = btrfs_tree_mod_seq_prev(node->seq);
break;
case BTRFS_DROP_DELAYED_REF:
sgn = -1;
seq = node->seq;
break;
case BTRFS_UPDATE_DELAYED_HEAD:
return 0;
default:
BUG();
}
mutex_lock(&fs_info->qgroup_rescan_lock);
if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
if (fs_info->qgroup_rescan_progress.objectid <= node->bytenr) {
mutex_unlock(&fs_info->qgroup_rescan_lock);
return 0;
}
}
mutex_unlock(&fs_info->qgroup_rescan_lock);
/*
* the delayed ref sequence number we pass depends on the direction of
* the operation. for add operations, we pass
* tree_mod_log_prev_seq(node->seq) to skip
* the delayed ref's current sequence number, because we need the state
* of the tree before the add operation. for delete operations, we pass
* (node->seq) to include the delayed ref's current sequence number,
* because we need the state of the tree after the delete operation.
*/
ret = btrfs_find_all_roots(trans, fs_info, node->bytenr, seq, &roots);
if (ret < 0)
return ret;
spin_lock(&fs_info->qgroup_lock);
quota_root = fs_info->quota_root;
if (!quota_root)
goto unlock;
qgroup = find_qgroup_rb(fs_info, ref_root);
if (!qgroup)
goto unlock;
/*
* step 1: for each old ref, visit all nodes once and inc refcnt
*/
ulist_reinit(fs_info->qgroup_ulist);
seq = fs_info->qgroup_seq;
fs_info->qgroup_seq += roots->nnodes + 1; /* max refcnt */
ret = qgroup_account_ref_step1(fs_info, roots, fs_info->qgroup_ulist,
seq);
if (ret)
goto unlock;
/*
* step 2: walk from the new root
*/
ret = qgroup_account_ref_step2(fs_info, roots, fs_info->qgroup_ulist,
seq, sgn, node->num_bytes, qgroup);
if (ret)
goto unlock;
/*
* step 3: walk again from old refs
*/
ret = qgroup_account_ref_step3(fs_info, roots, fs_info->qgroup_ulist,
seq, sgn, node->num_bytes);
if (ret)
goto unlock;
unlock:
spin_unlock(&fs_info->qgroup_lock);
ulist_free(roots);
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_worker(&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;
int srcroot_level;
srckey.objectid = srcid;
srckey.type = BTRFS_ROOT_ITEM_KEY;
srckey.offset = (u64)-1;
srcroot = btrfs_read_fs_root_no_name(fs_info, &srckey);
if (IS_ERR(srcroot)) {
ret = PTR_ERR(srcroot);
goto out;
}
rcu_read_lock();
srcroot_level = btrfs_header_level(srcroot->node);
level_size = btrfs_level_size(srcroot, srcroot_level);
rcu_read_unlock();
}
/*
* add qgroup to all inherited groups
*/
if (inherit) {
i_qgroups = (u64 *)(inherit + 1);
for (i = 0; i < inherit->num_qgroups; ++i) {
ret = add_qgroup_relation_item(trans, quota_root,
objectid, *i_qgroups);
if (ret)
goto out;
ret = add_qgroup_relation_item(trans, quota_root,
*i_qgroups, objectid);
if (ret)
goto out;
++i_qgroups;
}
}
spin_lock(&fs_info->qgroup_lock);
dstgroup = add_qgroup_rb(fs_info, objectid);
if (IS_ERR(dstgroup)) {
ret = PTR_ERR(dstgroup);
goto unlock;
}
if (srcid) {
srcgroup = find_qgroup_rb(fs_info, srcid);
if (!srcgroup)
goto unlock;
dstgroup->rfer = srcgroup->rfer - level_size;
dstgroup->rfer_cmpr = srcgroup->rfer_cmpr - level_size;
srcgroup->excl = level_size;
srcgroup->excl_cmpr = level_size;
qgroup_dirty(fs_info, dstgroup);
qgroup_dirty(fs_info, srcgroup);
}
if (!inherit)
goto unlock;
i_qgroups = (u64 *)(inherit + 1);
for (i = 0; i < inherit->num_qgroups; ++i) {
ret = add_relation_rb(quota_root->fs_info, objectid,
*i_qgroups);
if (ret)
goto unlock;
++i_qgroups;
}
for (i = 0; i < inherit->num_ref_copies; ++i) {
struct btrfs_qgroup *src;
struct btrfs_qgroup *dst;
src = find_qgroup_rb(fs_info, i_qgroups[0]);
dst = find_qgroup_rb(fs_info, i_qgroups[1]);
if (!src || !dst) {
ret = -EINVAL;
goto unlock;
}
dst->rfer = src->rfer - level_size;
dst->rfer_cmpr = src->rfer_cmpr - level_size;
i_qgroups += 2;
}
for (i = 0; i < inherit->num_excl_copies; ++i) {
struct btrfs_qgroup *src;
struct btrfs_qgroup *dst;
src = find_qgroup_rb(fs_info, i_qgroups[0]);
dst = find_qgroup_rb(fs_info, i_qgroups[1]);
if (!src || !dst) {
ret = -EINVAL;
goto unlock;
}
dst->excl = src->excl + level_size;
dst->excl_cmpr = src->excl_cmpr + level_size;
i_qgroups += 2;
}
unlock:
spin_unlock(&fs_info->qgroup_lock);
out:
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 = (struct btrfs_qgroup *)(uintptr_t)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 = (struct btrfs_qgroup *)(uintptr_t)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 = (struct btrfs_qgroup *)(uintptr_t)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 *tmp,
struct extent_buffer *scratch_leaf)
{
struct btrfs_key found;
struct ulist *roots = NULL;
struct ulist_node *unode;
struct ulist_iterator uiter;
struct seq_list tree_mod_seq_elem = {};
u64 seq;
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) {
u64 num_bytes;
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->leafsize;
else
num_bytes = found.offset;
ret = btrfs_find_all_roots(trans, fs_info, found.objectid,
tree_mod_seq_elem.seq, &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 */
ret = qgroup_account_ref_step1(fs_info, roots, tmp, seq);
if (ret) {
spin_unlock(&fs_info->qgroup_lock);
ulist_free(roots);
goto out;
}
/*
* step2 of btrfs_qgroup_account_ref works from a single root,
* we're doing all at once here.
*/
ulist_reinit(tmp);
ULIST_ITER_INIT(&uiter);
while ((unode = ulist_next(roots, &uiter))) {
struct btrfs_qgroup *qg;
qg = find_qgroup_rb(fs_info, unode->val);
if (!qg)
continue;
ret = ulist_add(tmp, qg->qgroupid, (uintptr_t)qg,
GFP_ATOMIC);
if (ret < 0) {
spin_unlock(&fs_info->qgroup_lock);
ulist_free(roots);
goto out;
}
}
/* this loop is similar to step 2 of btrfs_qgroup_account_ref */
ULIST_ITER_INIT(&uiter);
while ((unode = ulist_next(tmp, &uiter))) {
struct btrfs_qgroup *qg;
struct btrfs_qgroup_list *glist;
qg = (struct btrfs_qgroup *)(uintptr_t) unode->aux;
qg->rfer += num_bytes;
qg->rfer_cmpr += num_bytes;
WARN_ON(qg->tag >= seq);
if (qg->refcnt - seq == roots->nnodes) {
qg->excl += num_bytes;
qg->excl_cmpr += num_bytes;
}
qgroup_dirty(fs_info, qg);
list_for_each_entry(glist, &qg->groups, next_group) {
ret = ulist_add(tmp, glist->group->qgroupid,
(uintptr_t)glist->group,
GFP_ATOMIC);
if (ret < 0) {
spin_unlock(&fs_info->qgroup_lock);
ulist_free(roots);
goto out;
}
}
}
spin_unlock(&fs_info->qgroup_lock);
ulist_free(roots);
ret = 0;
}
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;
struct extent_buffer *scratch_leaf = NULL;
int err = -ENOMEM;
path = btrfs_alloc_path();
if (!path)
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,
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(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));
fs_info->qgroup_rescan_work.func = btrfs_qgroup_rescan_worker;
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_worker(&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_worker(&fs_info->qgroup_rescan_workers,
&fs_info->qgroup_rescan_work);
}