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Commit 64cfaef6 authored by Qu Wenruo's avatar Qu Wenruo Committed by David Sterba
Browse files

btrfs: qgroup: Introduce function to convert META_PREALLOC into META_PERTRANS 



For meta_prealloc reservation users, after btrfs_join_transaction()
caller will modify tree so part (or even all) meta_prealloc reservation
should be converted to meta_pertrans until transaction commit time.

This patch introduces a new function,
btrfs_qgroup_convert_reserved_meta() to do this for META_PREALLOC
reservation user.

Signed-off-by: default avatarQu Wenruo <wqu@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent e1211d0e

fs/btrfs/qgroup.c

+56 −0
Original line number Diff line number Diff line
@@ -3134,6 +3134,62 @@ void __btrfs_qgroup_free_meta(struct btrfs_root *root, int num_bytes, 
	btrfs_qgroup_free_refroot(fs_info, root->objectid, num_bytes, type);

}



static void qgroup_convert_meta(struct btrfs_fs_info *fs_info, u64 ref_root,

				int num_bytes)

{

	struct btrfs_root *quota_root = fs_info->quota_root;

	struct btrfs_qgroup *qgroup;

	struct ulist_node *unode;

	struct ulist_iterator uiter;

	int ret = 0;



	if (num_bytes == 0)

		return;

	if (!quota_root)

		return;



	spin_lock(&fs_info->qgroup_lock);

	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 = unode_aux_to_qgroup(unode);



		qgroup_rsv_release(fs_info, qg, num_bytes,

				BTRFS_QGROUP_RSV_META_PREALLOC);

		qgroup_rsv_add(fs_info, qg, num_bytes,

				BTRFS_QGROUP_RSV_META_PERTRANS);

		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 btrfs_qgroup_convert_reserved_meta(struct btrfs_root *root, int num_bytes)

{

	struct btrfs_fs_info *fs_info = root->fs_info;



	if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags) ||

	    !is_fstree(root->objectid))

		return;

	qgroup_convert_meta(fs_info, root->objectid, num_bytes);

}



/*

 * Check qgroup reserved space leaking, normally at destroy inode

 * time

fs/btrfs/qgroup.h

+8 −0
Original line number Diff line number Diff line
@@ -332,5 +332,13 @@ static inline void btrfs_qgroup_free_meta_prealloc(struct btrfs_root *root, 
 */

void btrfs_qgroup_free_meta_all_pertrans(struct btrfs_root *root);



/*

 * Convert @num_bytes of META_PREALLOCATED reservation to META_PERTRANS.

 *

 * This is called when preallocated meta reservation needs to be used.

 * Normally after btrfs_join_transaction() call.

 */

void btrfs_qgroup_convert_reserved_meta(struct btrfs_root *root, int num_bytes);



void btrfs_qgroup_check_reserved_leak(struct inode *inode);

#endif /* __BTRFS_QGROUP__ */