include/xfs_mount.h

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 */

#ifndef __XFS_MOUNT_H__
#define __XFS_MOUNT_H__

struct xfs_inode;
struct xfs_buftarg;
struct xfs_da_geometry;

typedef void (*buf_writeback_fn)(struct xfs_buf *bp);

/*
 * Define a user-level mount structure with all we need
 * in order to make use of the numerous XFS_* macros.
 */
typedef struct xfs_mount {
	xfs_sb_t		m_sb;		/* copy of fs superblock */
#define m_icount	m_sb.sb_icount
#define m_ifree		m_sb.sb_ifree
#define m_fdblocks	m_sb.sb_fdblocks
	spinlock_t		m_sb_lock;

	/*
	 * Bitsets of per-fs metadata that have been checked and/or are sick.
	 * Callers must hold m_sb_lock to access these two fields.
	 */
	uint8_t			m_fs_checked;
	uint8_t			m_fs_sick;

	char			*m_fsname;	/* filesystem name */
	int			m_bsize;	/* fs logical block size */
	spinlock_t		m_agirotor_lock;
	xfs_agnumber_t		m_agfrotor;	/* last ag where space found */
	xfs_agnumber_t		m_agirotor;	/* last ag dir inode alloced */
	xfs_agnumber_t		m_maxagi;	/* highest inode alloc group */
        struct xfs_ino_geometry	m_ino_geo;	/* inode geometry */
	uint			m_rsumlevels;	/* rt summary levels */
	uint			m_rsumsize;	/* size of rt summary, bytes */
	/*
	 * Optional cache of rt summary level per bitmap block with the
	 * invariant that m_rsum_cache[bbno] <= the minimum i for which
	 * rsum[i][bbno] != 0. Reads and writes are serialized by the rsumip
	 * inode lock.
	 */
	uint8_t			*m_rsum_cache;
	struct xfs_inode	*m_rbmip;	/* pointer to bitmap inode */
	struct xfs_inode	*m_rsumip;	/* pointer to summary inode */
	struct xfs_buftarg	*m_ddev_targp;
	struct xfs_buftarg	*m_logdev_targp;
	struct xfs_buftarg	*m_rtdev_targp;
#define m_dev		m_ddev_targp
#define m_logdev	m_logdev_targp
#define m_rtdev		m_rtdev_targp
	uint8_t			m_dircook_elog;	/* log d-cookie entry bits */
	uint8_t			m_blkbit_log;	/* blocklog + NBBY */
	uint8_t			m_blkbb_log;	/* blocklog - BBSHIFT */
	uint8_t			m_sectbb_log;	/* sectorlog - BBSHIFT */
	uint8_t			m_agno_log;	/* log #ag's */
	uint			m_blockmask;	/* sb_blocksize-1 */
	uint			m_blockwsize;	/* sb_blocksize in words */
	uint			m_blockwmask;	/* blockwsize-1 */
	uint			m_alloc_mxr[2];	/* XFS_ALLOC_BLOCK_MAXRECS */
	uint			m_alloc_mnr[2];	/* XFS_ALLOC_BLOCK_MINRECS */
	uint			m_bmap_dmxr[2];	/* XFS_BMAP_BLOCK_DMAXRECS */
	uint			m_bmap_dmnr[2];	/* XFS_BMAP_BLOCK_DMINRECS */
	uint			m_rmap_mxr[2];	/* max rmap btree records */
	uint			m_rmap_mnr[2];	/* min rmap btree records */
	uint			m_refc_mxr[2];	/* max refc btree records */
	uint			m_refc_mnr[2];	/* min refc btree records */
	uint			m_ag_maxlevels;	/* XFS_AG_MAXLEVELS */
	uint			m_bm_maxlevels[2]; /* XFS_BM_MAXLEVELS */
	uint			m_rmap_maxlevels; /* max rmap btree levels */
	uint			m_refc_maxlevels; /* max refc btree levels */
	xfs_extlen_t		m_ag_prealloc_blocks; /* reserved ag blocks */
	uint			m_alloc_set_aside; /* space we can't use */
	uint			m_ag_max_usable; /* max space per AG */
	struct radix_tree_root	m_perag_tree;
	uint			m_flags;	/* global mount flags */
	bool			m_finobt_nores; /* no per-AG finobt resv. */
	uint			m_qflags;	/* quota status flags */
	uint			m_attroffset;	/* inode attribute offset */
	struct xfs_trans_resv	m_resv;		/* precomputed res values */
	int			m_dalign;	/* stripe unit */
	int			m_swidth;	/* stripe width */
	const struct xfs_nameops *m_dirnameops;	/* vector of dir name ops */

	struct xfs_da_geometry	*m_dir_geo;	/* directory block geometry */
	struct xfs_da_geometry	*m_attr_geo;	/* attribute block geometry */

	/*
	 * anonymous struct to allow xfs_dquot_buf.c to compile.
	 * Pointer is always null in userspace, so code does not use it at all
	 */
	struct {
		int	qi_dqperchunk;
	}			*m_quotainfo;

	buf_writeback_fn	m_buf_writeback_fn;

	/*
	 * xlog is defined in libxlog and thus is not intialized by libxfs. This
	 * allows an application to initialize and store a reference to the log
	 * if warranted.
	 */
	struct xlog		*m_log;		/* log specific stuff */

        /*
	 * Global count of allocation btree blocks in use across all AGs. Only
	 * used when perag reservation is enabled. Helps prevent block
	 * reservation from attempting to reserve allocation btree blocks.
	 */
	atomic64_t		m_allocbt_blks;
	spinlock_t		m_perag_lock;	/* lock for m_perag_tree */

} xfs_mount_t;

#define M_IGEO(mp)		(&(mp)->m_ino_geo)

#define LIBXFS_MOUNT_DEBUGGER		0x0001
#define LIBXFS_MOUNT_32BITINODES	0x0002
#define LIBXFS_MOUNT_32BITINOOPT	0x0004
#define LIBXFS_MOUNT_COMPAT_ATTR	0x0008
#define LIBXFS_MOUNT_ATTR2		0x0010
#define LIBXFS_MOUNT_WANT_CORRUPTED	0x0020
#define LIBXFS_MOUNT_PERAG_DATA_LOADED	0x0040

#define LIBXFS_BHASHSIZE(sbp) 		(1<<10)

extern xfs_mount_t	*libxfs_mount (xfs_mount_t *, xfs_sb_t *,
				dev_t, dev_t, dev_t, int);
int libxfs_flush_mount(struct xfs_mount *mp);
int		libxfs_umount(struct xfs_mount *mp);
extern void	libxfs_rtmount_destroy (xfs_mount_t *);

/* Dummy xfs_dquot so that libxfs compiles. */
struct xfs_dquot {
	int		q_type;
};
#endif	/* __XFS_MOUNT_H__ */