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btrfs: qgroup: Add new qgroup calculation function

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btrfs_qgroup_account_extents().

The new btrfs_qgroup_account_extents() function should be called in
btrfs_commit_transaction() and it will update all the qgroup according
to delayed_ref_root->dirty_extent_root.

The new function can handle both normal operation during
commit_transaction() or in rescan in a unified method with clearer
logic.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Qu Wenruo 2015-04-16 15:37:33 +08:00 committed by Chris Mason
parent 21633fc603
commit 550d7a2ed5
3 changed files with 118 additions and 0 deletions
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0
fs/btrfs/extent-tree.h Normal file
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116
fs/btrfs/qgroup.c
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@ -2455,6 +2455,122 @@ static int btrfs_qgroup_account(struct btrfs_trans_handle *trans,
return ret;
}
static int
btrfs_qgroup_account_extent(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
u64 bytenr, u64 num_bytes,
struct ulist *old_roots, struct ulist *new_roots)
{
struct ulist *qgroups = NULL;
struct ulist *tmp = NULL;
u64 seq;
u64 nr_new_roots = 0;
u64 nr_old_roots = 0;
int ret = 0;
if (new_roots)
nr_new_roots = new_roots->nnodes;
if (old_roots)
nr_old_roots = old_roots->nnodes;
if (!fs_info->quota_enabled)
goto out_free;
BUG_ON(!fs_info->quota_root);
qgroups = ulist_alloc(GFP_NOFS);
if (!qgroups) {
ret = -ENOMEM;
goto out_free;
}
tmp = ulist_alloc(GFP_NOFS);
if (!tmp) {
ret = -ENOMEM;
goto out_free;
}
mutex_lock(&fs_info->qgroup_rescan_lock);
if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
if (fs_info->qgroup_rescan_progress.objectid <= bytenr) {
mutex_unlock(&fs_info->qgroup_rescan_lock);
ret = 0;
goto out_free;
}
}
mutex_unlock(&fs_info->qgroup_rescan_lock);
spin_lock(&fs_info->qgroup_lock);
seq = fs_info->qgroup_seq;
/* Update old refcnts using old_roots */
ret = qgroup_update_refcnt(fs_info, old_roots, tmp, qgroups, seq,
UPDATE_OLD);
if (ret < 0)
goto out;
/* Update new refcnts using new_roots */
ret = qgroup_update_refcnt(fs_info, new_roots, tmp, qgroups, seq,
UPDATE_NEW);
if (ret < 0)
goto out;
qgroup_update_counters(fs_info, qgroups, nr_old_roots, nr_new_roots,
num_bytes, seq);
/*
* Bump qgroup_seq to avoid seq overlap
*/
fs_info->qgroup_seq += max(nr_old_roots, nr_new_roots) + 1;
out:
spin_unlock(&fs_info->qgroup_lock);
out_free:
ulist_free(tmp);
ulist_free(qgroups);
ulist_free(old_roots);
ulist_free(new_roots);
return ret;
}
int btrfs_qgroup_account_extents(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info)
{
struct btrfs_qgroup_extent_record *record;
struct btrfs_delayed_ref_root *delayed_refs;
struct ulist *new_roots = NULL;
struct rb_node *node;
int ret = 0;
delayed_refs = &trans->transaction->delayed_refs;
while ((node = rb_first(&delayed_refs->dirty_extent_root))) {
record = rb_entry(node, struct btrfs_qgroup_extent_record,
node);
if (!ret) {
/*
* Use (u64)-1 as time_seq to do special search, which
* doesn't lock tree or delayed_refs and search current
* root. It's safe inside commit_transaction().
*/
ret = btrfs_find_all_roots(trans, fs_info,
record->bytenr, (u64)-1, &new_roots);
if (ret < 0)
goto cleanup;
ret = btrfs_qgroup_account_extent(trans, fs_info,
record->bytenr, record->num_bytes,
record->old_roots, new_roots);
record->old_roots = NULL;
new_roots = NULL;
}
cleanup:
ulist_free(record->old_roots);
ulist_free(new_roots);
new_roots = NULL;
rb_erase(node, &delayed_refs->dirty_extent_root);
kfree(record);
}
return ret;
}
/*
* Needs to be called everytime we run delayed refs, even if there is an error
* in order to cleanup outstanding operations.

2
fs/btrfs/qgroup.h
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@ -103,6 +103,8 @@ int btrfs_qgroup_prepare_account_extents(struct btrfs_trans_handle *trans,
struct btrfs_qgroup_extent_record
*btrfs_qgroup_insert_dirty_extent(struct btrfs_delayed_ref_root *delayed_refs,
struct btrfs_qgroup_extent_record *record);
int btrfs_qgroup_account_extents(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info);
int btrfs_delayed_qgroup_accounting(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info);
void btrfs_remove_qgroup_operation(struct btrfs_trans_handle *trans,