linux/fs/xfs/libxfs/xfs_ag.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (c) 2018 Red Hat, Inc.
 * All rights reserved.
 */

#ifndef __LIBXFS_AG_H
#define __LIBXFS_AG_H …

struct xfs_mount;
struct xfs_trans;
struct xfs_perag;

/*
 * Per-ag infrastructure
 */

/* per-AG block reservation data structures*/
struct xfs_ag_resv { … };

/*
 * Per-ag incore structure, copies of information in agf and agi, to improve the
 * performance of allocation group selection.
 */
struct xfs_perag { … };

/*
 * Per-AG operational state. These are atomic flag bits.
 */
#define XFS_AGSTATE_AGF_INIT …
#define XFS_AGSTATE_AGI_INIT …
#define XFS_AGSTATE_PREFERS_METADATA …
#define XFS_AGSTATE_ALLOWS_INODES …
#define XFS_AGSTATE_AGFL_NEEDS_RESET …

#define __XFS_AG_OPSTATE(name, NAME) …

__XFS_AG_OPSTATE(…)
__XFS_AG_OPSTATE(…)
__XFS_AG_OPSTATE(…)
__XFS_AG_OPSTATE(…)
__XFS_AG_OPSTATE(…)

void xfs_free_unused_perag_range(struct xfs_mount *mp, xfs_agnumber_t agstart,
			xfs_agnumber_t agend);
int xfs_initialize_perag(struct xfs_mount *mp, xfs_agnumber_t agcount,
			xfs_rfsblock_t dcount, xfs_agnumber_t *maxagi);
int xfs_initialize_perag_data(struct xfs_mount *mp, xfs_agnumber_t agno);
void xfs_free_perag(struct xfs_mount *mp);

/* Passive AG references */
struct xfs_perag *xfs_perag_get(struct xfs_mount *mp, xfs_agnumber_t agno);
struct xfs_perag *xfs_perag_get_tag(struct xfs_mount *mp, xfs_agnumber_t agno,
		unsigned int tag);
struct xfs_perag *xfs_perag_hold(struct xfs_perag *pag);
void xfs_perag_put(struct xfs_perag *pag);

/* Active AG references */
struct xfs_perag *xfs_perag_grab(struct xfs_mount *, xfs_agnumber_t);
struct xfs_perag *xfs_perag_grab_tag(struct xfs_mount *, xfs_agnumber_t,
				   int tag);
void xfs_perag_rele(struct xfs_perag *pag);

/*
 * Per-ag geometry infomation and validation
 */
xfs_agblock_t xfs_ag_block_count(struct xfs_mount *mp, xfs_agnumber_t agno);
void xfs_agino_range(struct xfs_mount *mp, xfs_agnumber_t agno,
		xfs_agino_t *first, xfs_agino_t *last);

static inline bool
xfs_verify_agbno(struct xfs_perag *pag, xfs_agblock_t agbno)
{ … }

static inline bool
xfs_verify_agbext(
	struct xfs_perag	*pag,
	xfs_agblock_t		agbno,
	xfs_agblock_t		len)
{ … }

/*
 * Verify that an AG inode number pointer neither points outside the AG
 * nor points at static metadata.
 */
static inline bool
xfs_verify_agino(struct xfs_perag *pag, xfs_agino_t agino)
{ … }

/*
 * Verify that an AG inode number pointer neither points outside the AG
 * nor points at static metadata, or is NULLAGINO.
 */
static inline bool
xfs_verify_agino_or_null(struct xfs_perag *pag, xfs_agino_t agino)
{ … }

static inline bool
xfs_ag_contains_log(struct xfs_mount *mp, xfs_agnumber_t agno)
{ … }

/*
 * Perag iteration APIs
 */
static inline struct xfs_perag *
xfs_perag_next(
	struct xfs_perag	*pag,
	xfs_agnumber_t		*agno,
	xfs_agnumber_t		end_agno)
{ … }

#define for_each_perag_range(mp, agno, end_agno, pag) …

#define for_each_perag_from(mp, agno, pag) …

#define for_each_perag(mp, agno, pag) …

#define for_each_perag_tag(mp, agno, pag, tag) …

static inline struct xfs_perag *
xfs_perag_next_wrap(
	struct xfs_perag	*pag,
	xfs_agnumber_t		*agno,
	xfs_agnumber_t		stop_agno,
	xfs_agnumber_t		restart_agno,
	xfs_agnumber_t		wrap_agno)
{ … }

/*
 * Iterate all AGs from start_agno through wrap_agno, then restart_agno through
 * (start_agno - 1).
 */
#define for_each_perag_wrap_range(mp, start_agno, restart_agno, wrap_agno, agno, pag) …
/*
 * Iterate all AGs from start_agno through wrap_agno, then 0 through
 * (start_agno - 1).
 */
#define for_each_perag_wrap_at(mp, start_agno, wrap_agno, agno, pag) …

/*
 * Iterate all AGs from start_agno through to the end of the filesystem, then 0
 * through (start_agno - 1).
 */
#define for_each_perag_wrap(mp, start_agno, agno, pag) …


struct aghdr_init_data { … };

int xfs_ag_init_headers(struct xfs_mount *mp, struct aghdr_init_data *id);
int xfs_ag_shrink_space(struct xfs_perag *pag, struct xfs_trans **tpp,
			xfs_extlen_t delta);
int xfs_ag_extend_space(struct xfs_perag *pag, struct xfs_trans *tp,
			xfs_extlen_t len);
int xfs_ag_get_geometry(struct xfs_perag *pag, struct xfs_ag_geometry *ageo);

#endif /* __LIBXFS_AG_H */