1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3  * Copyright (C) 2016 Oracle.  All Rights Reserved.
4  * Author: Darrick J. Wong <darrick.wong@oracle.com>
5  */
6 #ifndef __XFS_AG_RESV_H__
7 #define	__XFS_AG_RESV_H__
8 
9 int xfs_ag_resv_free(struct xfs_perag *pag);
10 int xfs_ag_resv_init(struct xfs_perag *pag, struct xfs_trans *tp);
11 
12 bool xfs_ag_resv_critical(struct xfs_perag *pag, enum xfs_ag_resv_type type);
13 xfs_extlen_t xfs_ag_resv_needed(struct xfs_perag *pag,
14 		enum xfs_ag_resv_type type);
15 
16 void xfs_ag_resv_alloc_extent(struct xfs_perag *pag, enum xfs_ag_resv_type type,
17 		struct xfs_alloc_arg *args);
18 void xfs_ag_resv_free_extent(struct xfs_perag *pag, enum xfs_ag_resv_type type,
19 		struct xfs_trans *tp, xfs_extlen_t len);
20 
21 static inline struct xfs_ag_resv *
xfs_perag_resv(struct xfs_perag * pag,enum xfs_ag_resv_type type)22 xfs_perag_resv(
23 	struct xfs_perag	*pag,
24 	enum xfs_ag_resv_type	type)
25 {
26 	switch (type) {
27 	case XFS_AG_RESV_METADATA:
28 		return &pag->pag_meta_resv;
29 	case XFS_AG_RESV_RMAPBT:
30 		return &pag->pag_rmapbt_resv;
31 	default:
32 		return NULL;
33 	}
34 }
35 
36 /*
37  * RMAPBT reservation accounting wrappers. Since rmapbt blocks are sourced from
38  * the AGFL, they are allocated one at a time and the reservation updates don't
39  * require a transaction.
40  */
41 static inline void
xfs_ag_resv_rmapbt_alloc(struct xfs_mount * mp,xfs_agnumber_t agno)42 xfs_ag_resv_rmapbt_alloc(
43 	struct xfs_mount	*mp,
44 	xfs_agnumber_t		agno)
45 {
46 	struct xfs_alloc_arg	args = { NULL };
47 	struct xfs_perag	*pag;
48 
49 	args.len = 1;
50 	pag = xfs_perag_get(mp, agno);
51 	xfs_ag_resv_alloc_extent(pag, XFS_AG_RESV_RMAPBT, &args);
52 	xfs_perag_put(pag);
53 }
54 
55 #endif	/* __XFS_AG_RESV_H__ */
56