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authorQu Wenruo <quwenruo@cn.fujitsu.com>2015-04-16 15:37:33 +0800
committerChris Mason <clm@fb.com>2015-06-10 09:25:49 -0700
commit550d7a2ed5db35756222ec17cff3376ff38d78e2 (patch)
treec8b60650e4ac8facdf25f498e2901b7eebb3f4ae /fs/btrfs/qgroup.c
parent21633fc6037f8ceb2bb927dacc3f9ef46ccae891 (diff)
downloadlinux-550d7a2ed5db35756222ec17cff3376ff38d78e2.tar.bz2
btrfs: qgroup: Add new qgroup calculation function
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>
Diffstat (limited to 'fs/btrfs/qgroup.c')
-rw-r--r--fs/btrfs/qgroup.c116
1 files changed, 116 insertions, 0 deletions
diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index 7b18fff558ca..607c6ca34955 100644
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -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.