[thirdparty/xfsprogs-dev.git] / 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;
struct libxfs_init;
struct xfs_group;

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

/* dynamic preallocation free space thresholds, 5% down to 1% */
enum {
	XFS_LOWSP_1_PCNT = 0,
	XFS_LOWSP_2_PCNT,
	XFS_LOWSP_3_PCNT,
	XFS_LOWSP_4_PCNT,
	XFS_LOWSP_5_PCNT,
	XFS_LOWSP_MAX,
};

struct xfs_groups {
	struct xarray		xa;

	/*
	 * Maximum capacity of the group in FSBs.
	 *
	 * Each group is laid out densely in the daddr space.  For the
	 * degenerate case of a pre-rtgroups filesystem, the incore rtgroup
	 * pretends to have a zero-block and zero-blklog rtgroup.
	 */
	uint32_t		blocks;

	/*
	 * Log(2) of the logical size of each group.
	 *
	 * Compared to the blocks field above this is rounded up to the next
	 * power of two, and thus lays out the xfs_fsblock_t/xfs_rtblock_t
	 * space sparsely with a hole from blocks to (1 << blklog) at the end
	 * of each group.
	 */
	uint8_t			blklog;

	/*
	 * Zoned devices can have gaps beyoned the usable capacity of a zone
	 * and the end in the LBA/daddr address space.  In other words, the
	 * hardware equivalent to the RT groups already takes care of the power
	 * of 2 alignment for us.  In this case the sparse FSB/RTB address space
	 * maps 1:1 to the device address space.
	 */
	bool			has_daddr_gaps;

	/*
	 * Mask to extract the group-relative block number from a FSB.
	 * For a pre-rtgroups filesystem we pretend to have one very large
	 * rtgroup, so this mask must be 64-bit.
	 */
	uint64_t		blkmask;

	/*
	 * Start of the first group in the device.  This is used to support a
	 * RT device following the data device on the same block device for
	 * SMR hard drives.
	 */
	xfs_fsblock_t		start_fsb;
};

/*
 * 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
	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 */
	xfs_filblks_t		m_rsumblocks;	/* size of rt summary, FSBs */
	struct xfs_inode	*m_metadirip;	/* ptr to metadata directory */
	struct xfs_inode	*m_rtdirip;	/* ptr to realtime metadir */
	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 */
	int8_t			m_rtxblklog;	/* log2 of rextsize, if possible */

	uint			m_blockmask;	/* sb_blocksize-1 */
	uint			m_blockwsize;	/* sb_blocksize in words */
	/* number of rt extents per rt bitmap block if rtgroups enabled */
	unsigned int		m_rtx_per_rbmblock;
	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_rtrmap_mxr[2]; /* max rtrmap btree records */
	uint			m_rtrmap_mnr[2]; /* min rtrmap btree records */
	uint			m_refc_mxr[2];	/* max refc btree records */
	uint			m_refc_mnr[2];	/* min refc btree records */
	unsigned int		m_rtrefc_mxr[2]; /* max rtrefc btree records */
	unsigned int		m_rtrefc_mnr[2]; /* min rtrefc btree records */
	uint			m_alloc_maxlevels; /* max alloc btree levels */
	uint			m_bm_maxlevels[2];  /* max bmap btree levels */
	uint			m_rmap_maxlevels; /* max rmap btree levels */
	uint			m_rtrmap_maxlevels; /* max rtrmap btree level */
	uint			m_refc_maxlevels; /* max refc btree levels */
	unsigned int		m_rtrefc_maxlevels; /* max rtrefc btree level */
	unsigned int		m_agbtree_maxlevels; /* max level of all AG btrees */
	unsigned int		m_rtbtree_maxlevels; /* max level of all rt btrees */
	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 xfs_groups	m_groups[XG_TYPE_MAX];
	uint64_t		m_features;	/* active filesystem features */
	uint64_t		m_low_space[XFS_LOWSP_MAX];
	uint64_t		m_rtxblkmask;	/* rt extent block mask */
	unsigned long		m_opstate;	/* dynamic state 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 */

	pthread_mutex_t		m_metafile_resv_lock;
	uint64_t		m_metafile_resv_target;
	uint64_t		m_metafile_resv_used;
	uint64_t		m_metafile_resv_avail;
} xfs_mount_t;

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

/*
 * Flags for m_features.
 *
 * These are all the active features in the filesystem, regardless of how
 * they are configured.
 */
#define XFS_FEAT_ATTR		(1ULL << 0)	/* xattrs present in fs */
#define XFS_FEAT_NLINK		(1ULL << 1)	/* 32 bit link counts */
#define XFS_FEAT_QUOTA		(1ULL << 2)	/* quota active */
#define XFS_FEAT_ALIGN		(1ULL << 3)	/* inode alignment */
#define XFS_FEAT_DALIGN		(1ULL << 4)	/* data alignment */
#define XFS_FEAT_LOGV2		(1ULL << 5)	/* version 2 logs */
#define XFS_FEAT_SECTOR		(1ULL << 6)	/* sector size > 512 bytes */
#define XFS_FEAT_EXTFLG		(1ULL << 7)	/* unwritten extents */
#define XFS_FEAT_ASCIICI	(1ULL << 8)	/* ASCII only case-insens. */
#define XFS_FEAT_LAZYSBCOUNT	(1ULL << 9)	/* Superblk counters */
#define XFS_FEAT_ATTR2		(1ULL << 10)	/* dynamic attr fork */
#define XFS_FEAT_PARENT		(1ULL << 11)	/* parent pointers */
#define XFS_FEAT_PROJID32	(1ULL << 12)	/* 32 bit project id */
#define XFS_FEAT_CRC		(1ULL << 13)	/* metadata CRCs */
#define XFS_FEAT_V3INODES	(1ULL << 14)	/* Version 3 inodes */
#define XFS_FEAT_PQUOTINO	(1ULL << 15)	/* non-shared proj/grp quotas */
#define XFS_FEAT_FTYPE		(1ULL << 16)	/* inode type in dir */
#define XFS_FEAT_FINOBT		(1ULL << 17)	/* free inode btree */
#define XFS_FEAT_RMAPBT		(1ULL << 18)	/* reverse map btree */
#define XFS_FEAT_REFLINK	(1ULL << 19)	/* reflinked files */
#define XFS_FEAT_SPINODES	(1ULL << 20)	/* sparse inode chunks */
#define XFS_FEAT_META_UUID	(1ULL << 21)	/* metadata UUID */
#define XFS_FEAT_REALTIME	(1ULL << 22)	/* realtime device present */
#define XFS_FEAT_INOBTCNT	(1ULL << 23)	/* inobt block counts */
#define XFS_FEAT_BIGTIME	(1ULL << 24)	/* large timestamps */
#define XFS_FEAT_NEEDSREPAIR	(1ULL << 25)	/* needs xfs_repair */
#define XFS_FEAT_NREXT64	(1ULL << 26)	/* large extent counters */
#define XFS_FEAT_EXCHANGE_RANGE	(1ULL << 27)	/* exchange range */
#define XFS_FEAT_METADIR	(1ULL << 28)	/* metadata directory tree */
#define XFS_FEAT_ZONED		(1ULL << 29)	/* zoned RT device */

#define __XFS_HAS_FEAT(name, NAME) \
static inline bool xfs_has_ ## name (const struct xfs_mount *mp) \
{ \
	return mp->m_features & XFS_FEAT_ ## NAME; \
}

/* Some features can be added dynamically so they need a set wrapper, too. */
#define __XFS_ADD_FEAT(name, NAME) \
	__XFS_HAS_FEAT(name, NAME); \
static inline void xfs_add_ ## name (struct xfs_mount *mp) \
{ \
	mp->m_features |= XFS_FEAT_ ## NAME; \
	xfs_sb_version_add ## name(&mp->m_sb); \
}

/* Superblock features */
__XFS_ADD_FEAT(attr, ATTR)
__XFS_HAS_FEAT(nlink, NLINK)
__XFS_ADD_FEAT(quota, QUOTA)
__XFS_HAS_FEAT(align, ALIGN)
__XFS_HAS_FEAT(dalign, DALIGN)
__XFS_HAS_FEAT(logv2, LOGV2)
__XFS_HAS_FEAT(sector, SECTOR)
__XFS_HAS_FEAT(extflg, EXTFLG)
__XFS_HAS_FEAT(asciici, ASCIICI)
__XFS_HAS_FEAT(lazysbcount, LAZYSBCOUNT)
__XFS_ADD_FEAT(attr2, ATTR2)
__XFS_HAS_FEAT(parent, PARENT)
__XFS_ADD_FEAT(projid32, PROJID32)
__XFS_HAS_FEAT(crc, CRC)
__XFS_HAS_FEAT(v3inodes, V3INODES)
__XFS_HAS_FEAT(pquotino, PQUOTINO)
__XFS_HAS_FEAT(ftype, FTYPE)
__XFS_HAS_FEAT(finobt, FINOBT)
__XFS_HAS_FEAT(rmapbt, RMAPBT)
__XFS_HAS_FEAT(reflink, REFLINK)
__XFS_HAS_FEAT(sparseinodes, SPINODES)
__XFS_HAS_FEAT(metauuid, META_UUID)
__XFS_HAS_FEAT(realtime, REALTIME)
__XFS_HAS_FEAT(inobtcounts, INOBTCNT)
__XFS_HAS_FEAT(bigtime, BIGTIME)
__XFS_HAS_FEAT(needsrepair, NEEDSREPAIR)
__XFS_HAS_FEAT(large_extent_counts, NREXT64)
__XFS_HAS_FEAT(exchange_range, EXCHANGE_RANGE)
__XFS_HAS_FEAT(metadir, METADIR)
__XFS_HAS_FEAT(zoned, ZONED)

static inline bool xfs_has_rtgroups(const struct xfs_mount *mp)
{
	/* all metadir file systems also allow rtgroups */
	return xfs_has_metadir(mp);
}

static inline bool xfs_has_rtsb(const struct xfs_mount *mp)
{
	/* all rtgroups filesystems with an rt section have an rtsb */
	return xfs_has_rtgroups(mp) &&
		xfs_has_realtime(mp) &&
		!xfs_has_zoned(mp);
}

static inline bool xfs_has_rtrmapbt(const struct xfs_mount *mp)
{
	return xfs_has_rtgroups(mp) && xfs_has_realtime(mp) &&
	       xfs_has_rmapbt(mp);
}

static inline bool xfs_has_rtreflink(const struct xfs_mount *mp)
{
	return xfs_has_metadir(mp) && xfs_has_realtime(mp) &&
	       xfs_has_reflink(mp);
}

static inline bool xfs_has_nonzoned(const struct xfs_mount *mp)
{
	return !xfs_has_zoned(mp);
}

/* Kernel mount features that we don't support */
#define __XFS_UNSUPP_FEAT(name) \
static inline bool xfs_has_ ## name (const struct xfs_mount *mp) \
{ \
	return false; \
}
__XFS_UNSUPP_FEAT(wsync)
__XFS_UNSUPP_FEAT(noattr2)
__XFS_UNSUPP_FEAT(ikeep)
__XFS_UNSUPP_FEAT(swalloc)
__XFS_UNSUPP_FEAT(small_inums)
__XFS_UNSUPP_FEAT(readonly)
__XFS_UNSUPP_FEAT(grpid)

/* Operational mount state flags */
#define XFS_OPSTATE_INODE32		0	/* inode32 allocator active */
#define XFS_OPSTATE_DEBUGGER		1	/* is this the debugger? */
#define XFS_OPSTATE_REPORT_CORRUPTION	2	/* report buffer corruption? */
#define XFS_OPSTATE_PERAG_DATA_LOADED	3	/* per-AG data initialized? */
#define XFS_OPSTATE_RTGROUP_DATA_LOADED	4	/* rtgroup data initialized? */

#define __XFS_IS_OPSTATE(name, NAME) \
static inline bool xfs_is_ ## name (struct xfs_mount *mp) \
{ \
	return (mp)->m_opstate & (1UL << XFS_OPSTATE_ ## NAME); \
} \
static inline bool xfs_clear_ ## name (struct xfs_mount *mp) \
{ \
	bool	ret = xfs_is_ ## name(mp); \
\
	(mp)->m_opstate &= ~(1UL << XFS_OPSTATE_ ## NAME); \
	return ret; \
} \
static inline bool xfs_set_ ## name (struct xfs_mount *mp) \
{ \
	bool	ret = xfs_is_ ## name(mp); \
\
	(mp)->m_opstate |= (1UL << XFS_OPSTATE_ ## NAME); \
	return ret; \
}

__XFS_IS_OPSTATE(inode32, INODE32)
__XFS_IS_OPSTATE(debugger, DEBUGGER)
__XFS_IS_OPSTATE(reporting_corruption, REPORT_CORRUPTION)
__XFS_IS_OPSTATE(perag_data_loaded, PERAG_DATA_LOADED)
__XFS_IS_OPSTATE(rtgroup_data_loaded, RTGROUP_DATA_LOADED)

#define __XFS_UNSUPP_OPSTATE(name) \
static inline bool xfs_is_ ## name (struct xfs_mount *mp) \
{ \
	return false; \
}
__XFS_UNSUPP_OPSTATE(readonly)
__XFS_UNSUPP_OPSTATE(shutdown)

static inline int64_t xfs_sum_freecounter(struct xfs_mount *mp,
		enum xfs_free_counter ctr)
{
	if (ctr == XC_FREE_RTEXTENTS)
		return mp->m_sb.sb_frextents;
	return mp->m_sb.sb_fdblocks;
}

static inline int64_t xfs_estimate_freecounter(struct xfs_mount *mp,
		enum xfs_free_counter ctr)
{
	return xfs_sum_freecounter(mp, ctr);
}

static inline int xfs_compare_freecounter(struct xfs_mount *mp,
		enum xfs_free_counter ctr, int64_t rhs, int32_t batch)
{
	uint64_t count;

	if (ctr == XC_FREE_RTEXTENTS)
		count = mp->m_sb.sb_frextents;
	else
		count = mp->m_sb.sb_fdblocks;
	if (count > rhs)
		return 1;
	else if (count < rhs)
		return -1;
	return 0;
}

/* don't fail on device size or AG count checks */
#define LIBXFS_MOUNT_DEBUGGER		(1U << 0)
/* report metadata corruption to stdout */
#define LIBXFS_MOUNT_REPORT_CORRUPTION	(1U << 1)

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

void libxfs_compute_all_maxlevels(struct xfs_mount *mp);
struct xfs_mount *libxfs_mount(struct xfs_mount *mp, struct xfs_sb *sb,
		struct libxfs_init *xi, unsigned int flags);
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;
};

typedef struct wait_queue_head {
} wait_queue_head_t;

static inline void wake_up(wait_queue_head_t *wq) {}

struct xfs_defer_drain { /* empty */ };

#define xfs_defer_drain_init(dr)		((void)0)
#define xfs_defer_drain_free(dr)		((void)0)

#define xfs_group_intent_get(mp, fsbno, type) \
	xfs_group_get_by_fsb((mp), (fsbno), (type))
#define xfs_group_intent_put(xg)		xfs_group_put(xg)

static inline void xfs_group_intent_hold(struct xfs_group *xg) {}
static inline void xfs_group_intent_rele(struct xfs_group *xg) {}

static inline void libxfs_buftarg_drain(struct xfs_buftarg *btp)
{
	cache_purge(btp->bcache);
}

struct mnt_idmap {
	/* empty */
};

/* bogus idmapping so that mkfs can do directory inheritance correctly */
#define libxfs_nop_idmap	((struct mnt_idmap *)1)

#endif	/* __XFS_MOUNT_H__ */
Commit	Line	Data
	1	// SPDX-License-Identifier: GPL-2.0
	2	/*
	3	* Copyright (c) 2000-2005 Silicon Graphics, Inc.
	4	* All Rights Reserved.
	5	*/
	6
	7	#ifndef __XFS_MOUNT_H__
	8	#define __XFS_MOUNT_H__
	9
	10	struct xfs_inode;
	11	struct xfs_buftarg;
	12	struct xfs_da_geometry;
	13	struct libxfs_init;
	14	struct xfs_group;
	15
	16	typedef void (buf_writeback_fn)(struct xfs_buf bp);
	17
	18	/* dynamic preallocation free space thresholds, 5% down to 1% */
	19	enum {
	20	XFS_LOWSP_1_PCNT = 0,
	21	XFS_LOWSP_2_PCNT,
	22	XFS_LOWSP_3_PCNT,
	23	XFS_LOWSP_4_PCNT,
	24	XFS_LOWSP_5_PCNT,
	25	XFS_LOWSP_MAX,
	26	};
	27
	28	struct xfs_groups {
	29	struct xarray xa;
	30
	31	/*
	32	* Maximum capacity of the group in FSBs.
	33	*
	34	* Each group is laid out densely in the daddr space. For the
	35	* degenerate case of a pre-rtgroups filesystem, the incore rtgroup
	36	* pretends to have a zero-block and zero-blklog rtgroup.
	37	*/
	38	uint32_t blocks;
	39
	40	/*
	41	* Log(2) of the logical size of each group.
	42	*
	43	* Compared to the blocks field above this is rounded up to the next
	44	* power of two, and thus lays out the xfs_fsblock_t/xfs_rtblock_t
	45	* space sparsely with a hole from blocks to (1 << blklog) at the end
	46	* of each group.
	47	*/
	48	uint8_t blklog;
	49
	50	/*
	51	* Zoned devices can have gaps beyoned the usable capacity of a zone
	52	* and the end in the LBA/daddr address space. In other words, the
	53	* hardware equivalent to the RT groups already takes care of the power
	54	* of 2 alignment for us. In this case the sparse FSB/RTB address space
	55	* maps 1:1 to the device address space.
	56	*/
	57	bool has_daddr_gaps;
	58
	59	/*
	60	* Mask to extract the group-relative block number from a FSB.
	61	* For a pre-rtgroups filesystem we pretend to have one very large
	62	* rtgroup, so this mask must be 64-bit.
	63	*/
	64	uint64_t blkmask;
	65
	66	/*
	67	* Start of the first group in the device. This is used to support a
	68	* RT device following the data device on the same block device for
	69	* SMR hard drives.
	70	*/
	71	xfs_fsblock_t start_fsb;
	72	};
	73
	74	/*
	75	* Define a user-level mount structure with all we need
	76	* in order to make use of the numerous XFS_* macros.
	77	*/
	78	typedef struct xfs_mount {
	79	xfs_sb_t m_sb; /* copy of fs superblock */
	80	#define m_icount m_sb.sb_icount
	81	#define m_ifree m_sb.sb_ifree
	82	spinlock_t m_sb_lock;
	83
	84	/*
	85	* Bitsets of per-fs metadata that have been checked and/or are sick.
	86	* Callers must hold m_sb_lock to access these two fields.
	87	*/
	88	uint8_t m_fs_checked;
	89	uint8_t m_fs_sick;
	90
	91	char m_fsname; / filesystem name */
	92	int m_bsize; /* fs logical block size */
	93	spinlock_t m_agirotor_lock;
	94	xfs_agnumber_t m_agfrotor; /* last ag where space found */
	95	xfs_agnumber_t m_agirotor; /* last ag dir inode alloced */
	96	xfs_agnumber_t m_maxagi; /* highest inode alloc group */
	97	struct xfs_ino_geometry m_ino_geo; /* inode geometry */
	98	uint m_rsumlevels; /* rt summary levels */
	99	xfs_filblks_t m_rsumblocks; /* size of rt summary, FSBs */
	100	struct xfs_inode m_metadirip; / ptr to metadata directory */
	101	struct xfs_inode m_rtdirip; / ptr to realtime metadir */
	102	struct xfs_buftarg *m_ddev_targp;
	103	struct xfs_buftarg *m_logdev_targp;
	104	struct xfs_buftarg *m_rtdev_targp;
	105	#define m_dev m_ddev_targp
	106	#define m_logdev m_logdev_targp
	107	#define m_rtdev m_rtdev_targp
	108	uint8_t m_dircook_elog; /* log d-cookie entry bits */
	109	uint8_t m_blkbit_log; /* blocklog + NBBY */
	110	uint8_t m_blkbb_log; /* blocklog - BBSHIFT */
	111	uint8_t m_sectbb_log; /* sectorlog - BBSHIFT */
	112	uint8_t m_agno_log; /* log #ag's */
	113	int8_t m_rtxblklog; /* log2 of rextsize, if possible */
	114
	115	uint m_blockmask; /* sb_blocksize-1 */
	116	uint m_blockwsize; /* sb_blocksize in words */
	117	/* number of rt extents per rt bitmap block if rtgroups enabled */
	118	unsigned int m_rtx_per_rbmblock;
	119	uint m_alloc_mxr[2]; /* XFS_ALLOC_BLOCK_MAXRECS */
	120	uint m_alloc_mnr[2]; /* XFS_ALLOC_BLOCK_MINRECS */
	121	uint m_bmap_dmxr[2]; /* XFS_BMAP_BLOCK_DMAXRECS */
	122	uint m_bmap_dmnr[2]; /* XFS_BMAP_BLOCK_DMINRECS */
	123	uint m_rmap_mxr[2]; /* max rmap btree records */
	124	uint m_rmap_mnr[2]; /* min rmap btree records */
	125	uint m_rtrmap_mxr[2]; /* max rtrmap btree records */
	126	uint m_rtrmap_mnr[2]; /* min rtrmap btree records */
	127	uint m_refc_mxr[2]; /* max refc btree records */
	128	uint m_refc_mnr[2]; /* min refc btree records */
	129	unsigned int m_rtrefc_mxr[2]; /* max rtrefc btree records */
	130	unsigned int m_rtrefc_mnr[2]; /* min rtrefc btree records */
	131	uint m_alloc_maxlevels; /* max alloc btree levels */
	132	uint m_bm_maxlevels[2]; /* max bmap btree levels */
	133	uint m_rmap_maxlevels; /* max rmap btree levels */
	134	uint m_rtrmap_maxlevels; /* max rtrmap btree level */
	135	uint m_refc_maxlevels; /* max refc btree levels */
	136	unsigned int m_rtrefc_maxlevels; /* max rtrefc btree level */
	137	unsigned int m_agbtree_maxlevels; /* max level of all AG btrees */
	138	unsigned int m_rtbtree_maxlevels; /* max level of all rt btrees */
	139	xfs_extlen_t m_ag_prealloc_blocks; /* reserved ag blocks */
	140	uint m_alloc_set_aside; /* space we can't use */
	141	uint m_ag_max_usable; /* max space per AG */
	142	struct xfs_groups m_groups[XG_TYPE_MAX];
	143	uint64_t m_features; /* active filesystem features */
	144	uint64_t m_low_space[XFS_LOWSP_MAX];
	145	uint64_t m_rtxblkmask; /* rt extent block mask */
	146	unsigned long m_opstate; /* dynamic state flags */
	147	bool m_finobt_nores; /* no per-AG finobt resv. */
	148	uint m_qflags; /* quota status flags */
	149	uint m_attroffset; /* inode attribute offset */
	150	struct xfs_trans_resv m_resv; /* precomputed res values */
	151	int m_dalign; /* stripe unit */
	152	int m_swidth; /* stripe width */
	153	const struct xfs_nameops m_dirnameops; / vector of dir name ops */
	154
	155	struct xfs_da_geometry m_dir_geo; / directory block geometry */
	156	struct xfs_da_geometry m_attr_geo; / attribute block geometry */
	157
	158	/*
	159	* anonymous struct to allow xfs_dquot_buf.c to compile.
	160	* Pointer is always null in userspace, so code does not use it at all
	161	*/
	162	struct {
	163	int qi_dqperchunk;
	164	} *m_quotainfo;
	165
	166	buf_writeback_fn m_buf_writeback_fn;
	167
	168	/*
	169	* xlog is defined in libxlog and thus is not intialized by libxfs. This
	170	* allows an application to initialize and store a reference to the log
	171	* if warranted.
	172	*/
	173	struct xlog m_log; / log specific stuff */
	174
	175	/*
	176	* Global count of allocation btree blocks in use across all AGs. Only
	177	* used when perag reservation is enabled. Helps prevent block
	178	* reservation from attempting to reserve allocation btree blocks.
	179	*/
	180	atomic64_t m_allocbt_blks;
	181	spinlock_t m_perag_lock; /* lock for m_perag_tree */
	182
	183	pthread_mutex_t m_metafile_resv_lock;
	184	uint64_t m_metafile_resv_target;
	185	uint64_t m_metafile_resv_used;
	186	uint64_t m_metafile_resv_avail;
	187	} xfs_mount_t;
	188
	189	#define M_IGEO(mp) (&(mp)->m_ino_geo)
	190
	191	/*
	192	* Flags for m_features.
	193	*
	194	* These are all the active features in the filesystem, regardless of how
	195	* they are configured.
	196	*/
	197	#define XFS_FEAT_ATTR (1ULL << 0) /* xattrs present in fs */
	198	#define XFS_FEAT_NLINK (1ULL << 1) /* 32 bit link counts */
	199	#define XFS_FEAT_QUOTA (1ULL << 2) /* quota active */
	200	#define XFS_FEAT_ALIGN (1ULL << 3) /* inode alignment */
	201	#define XFS_FEAT_DALIGN (1ULL << 4) /* data alignment */
	202	#define XFS_FEAT_LOGV2 (1ULL << 5) /* version 2 logs */
	203	#define XFS_FEAT_SECTOR (1ULL << 6) /* sector size > 512 bytes */
	204	#define XFS_FEAT_EXTFLG (1ULL << 7) /* unwritten extents */
	205	#define XFS_FEAT_ASCIICI (1ULL << 8) /* ASCII only case-insens. */
	206	#define XFS_FEAT_LAZYSBCOUNT (1ULL << 9) /* Superblk counters */
	207	#define XFS_FEAT_ATTR2 (1ULL << 10) /* dynamic attr fork */
	208	#define XFS_FEAT_PARENT (1ULL << 11) /* parent pointers */
	209	#define XFS_FEAT_PROJID32 (1ULL << 12) /* 32 bit project id */
	210	#define XFS_FEAT_CRC (1ULL << 13) /* metadata CRCs */
	211	#define XFS_FEAT_V3INODES (1ULL << 14) /* Version 3 inodes */
	212	#define XFS_FEAT_PQUOTINO (1ULL << 15) /* non-shared proj/grp quotas */
	213	#define XFS_FEAT_FTYPE (1ULL << 16) /* inode type in dir */
	214	#define XFS_FEAT_FINOBT (1ULL << 17) /* free inode btree */
	215	#define XFS_FEAT_RMAPBT (1ULL << 18) /* reverse map btree */
	216	#define XFS_FEAT_REFLINK (1ULL << 19) /* reflinked files */
	217	#define XFS_FEAT_SPINODES (1ULL << 20) /* sparse inode chunks */
	218	#define XFS_FEAT_META_UUID (1ULL << 21) /* metadata UUID */
	219	#define XFS_FEAT_REALTIME (1ULL << 22) /* realtime device present */
	220	#define XFS_FEAT_INOBTCNT (1ULL << 23) /* inobt block counts */
	221	#define XFS_FEAT_BIGTIME (1ULL << 24) /* large timestamps */
	222	#define XFS_FEAT_NEEDSREPAIR (1ULL << 25) /* needs xfs_repair */
	223	#define XFS_FEAT_NREXT64 (1ULL << 26) /* large extent counters */
	224	#define XFS_FEAT_EXCHANGE_RANGE (1ULL << 27) /* exchange range */
	225	#define XFS_FEAT_METADIR (1ULL << 28) /* metadata directory tree */
	226	#define XFS_FEAT_ZONED (1ULL << 29) /* zoned RT device */
	227
	228	#define __XFS_HAS_FEAT(name, NAME) \
	229	static inline bool xfs_has_ ## name (const struct xfs_mount *mp) \
	230	{ \
	231	return mp->m_features & XFS_FEAT_ ## NAME; \
	232	}
	233
	234	/* Some features can be added dynamically so they need a set wrapper, too. */
	235	#define __XFS_ADD_FEAT(name, NAME) \
	236	__XFS_HAS_FEAT(name, NAME); \
	237	static inline void xfs_add_ ## name (struct xfs_mount *mp) \
	238	{ \
	239	mp->m_features \|= XFS_FEAT_ ## NAME; \
	240	xfs_sb_version_add ## name(&mp->m_sb); \
	241	}
	242
	243	/* Superblock features */
	244	__XFS_ADD_FEAT(attr, ATTR)
	245	__XFS_HAS_FEAT(nlink, NLINK)
	246	__XFS_ADD_FEAT(quota, QUOTA)
	247	__XFS_HAS_FEAT(align, ALIGN)
	248	__XFS_HAS_FEAT(dalign, DALIGN)
	249	__XFS_HAS_FEAT(logv2, LOGV2)
	250	__XFS_HAS_FEAT(sector, SECTOR)
	251	__XFS_HAS_FEAT(extflg, EXTFLG)
	252	__XFS_HAS_FEAT(asciici, ASCIICI)
	253	__XFS_HAS_FEAT(lazysbcount, LAZYSBCOUNT)
	254	__XFS_ADD_FEAT(attr2, ATTR2)
	255	__XFS_HAS_FEAT(parent, PARENT)
	256	__XFS_ADD_FEAT(projid32, PROJID32)
	257	__XFS_HAS_FEAT(crc, CRC)
	258	__XFS_HAS_FEAT(v3inodes, V3INODES)
	259	__XFS_HAS_FEAT(pquotino, PQUOTINO)
	260	__XFS_HAS_FEAT(ftype, FTYPE)
	261	__XFS_HAS_FEAT(finobt, FINOBT)
	262	__XFS_HAS_FEAT(rmapbt, RMAPBT)
	263	__XFS_HAS_FEAT(reflink, REFLINK)
	264	__XFS_HAS_FEAT(sparseinodes, SPINODES)
	265	__XFS_HAS_FEAT(metauuid, META_UUID)
	266	__XFS_HAS_FEAT(realtime, REALTIME)
	267	__XFS_HAS_FEAT(inobtcounts, INOBTCNT)
	268	__XFS_HAS_FEAT(bigtime, BIGTIME)
	269	__XFS_HAS_FEAT(needsrepair, NEEDSREPAIR)
	270	__XFS_HAS_FEAT(large_extent_counts, NREXT64)
	271	__XFS_HAS_FEAT(exchange_range, EXCHANGE_RANGE)
	272	__XFS_HAS_FEAT(metadir, METADIR)
	273	__XFS_HAS_FEAT(zoned, ZONED)
	274
	275	static inline bool xfs_has_rtgroups(const struct xfs_mount *mp)
	276	{
	277	/* all metadir file systems also allow rtgroups */
	278	return xfs_has_metadir(mp);
	279	}
	280
	281	static inline bool xfs_has_rtsb(const struct xfs_mount *mp)
	282	{
	283	/* all rtgroups filesystems with an rt section have an rtsb */
	284	return xfs_has_rtgroups(mp) &&
	285	xfs_has_realtime(mp) &&
	286	!xfs_has_zoned(mp);
	287	}
	288
	289	static inline bool xfs_has_rtrmapbt(const struct xfs_mount *mp)
	290	{
	291	return xfs_has_rtgroups(mp) && xfs_has_realtime(mp) &&
	292	xfs_has_rmapbt(mp);
	293	}
	294
	295	static inline bool xfs_has_rtreflink(const struct xfs_mount *mp)
	296	{
	297	return xfs_has_metadir(mp) && xfs_has_realtime(mp) &&
	298	xfs_has_reflink(mp);
	299	}
	300
	301	static inline bool xfs_has_nonzoned(const struct xfs_mount *mp)
	302	{
	303	return !xfs_has_zoned(mp);
	304	}
	305
	306	/* Kernel mount features that we don't support */
	307	#define __XFS_UNSUPP_FEAT(name) \
	308	static inline bool xfs_has_ ## name (const struct xfs_mount *mp) \
	309	{ \
	310	return false; \
	311	}
	312	__XFS_UNSUPP_FEAT(wsync)
	313	__XFS_UNSUPP_FEAT(noattr2)
	314	__XFS_UNSUPP_FEAT(ikeep)
	315	__XFS_UNSUPP_FEAT(swalloc)
	316	__XFS_UNSUPP_FEAT(small_inums)
	317	__XFS_UNSUPP_FEAT(readonly)
	318	__XFS_UNSUPP_FEAT(grpid)
	319
	320	/* Operational mount state flags */
	321	#define XFS_OPSTATE_INODE32 0 /* inode32 allocator active */
	322	#define XFS_OPSTATE_DEBUGGER 1 /* is this the debugger? */
	323	#define XFS_OPSTATE_REPORT_CORRUPTION 2 /* report buffer corruption? */
	324	#define XFS_OPSTATE_PERAG_DATA_LOADED 3 /* per-AG data initialized? */
	325	#define XFS_OPSTATE_RTGROUP_DATA_LOADED 4 /* rtgroup data initialized? */
	326
	327	#define __XFS_IS_OPSTATE(name, NAME) \
	328	static inline bool xfs_is_ ## name (struct xfs_mount *mp) \
	329	{ \
	330	return (mp)->m_opstate & (1UL << XFS_OPSTATE_ ## NAME); \
	331	} \
	332	static inline bool xfs_clear_ ## name (struct xfs_mount *mp) \
	333	{ \
	334	bool ret = xfs_is_ ## name(mp); \
	335	\
	336	(mp)->m_opstate &= ~(1UL << XFS_OPSTATE_ ## NAME); \
	337	return ret; \
	338	} \
	339	static inline bool xfs_set_ ## name (struct xfs_mount *mp) \
	340	{ \
	341	bool ret = xfs_is_ ## name(mp); \
	342	\
	343	(mp)->m_opstate \|= (1UL << XFS_OPSTATE_ ## NAME); \
	344	return ret; \
	345	}
	346
	347	__XFS_IS_OPSTATE(inode32, INODE32)
	348	__XFS_IS_OPSTATE(debugger, DEBUGGER)
	349	__XFS_IS_OPSTATE(reporting_corruption, REPORT_CORRUPTION)
	350	__XFS_IS_OPSTATE(perag_data_loaded, PERAG_DATA_LOADED)
	351	__XFS_IS_OPSTATE(rtgroup_data_loaded, RTGROUP_DATA_LOADED)
	352
	353	#define __XFS_UNSUPP_OPSTATE(name) \
	354	static inline bool xfs_is_ ## name (struct xfs_mount *mp) \
	355	{ \
	356	return false; \
	357	}
	358	__XFS_UNSUPP_OPSTATE(readonly)
	359	__XFS_UNSUPP_OPSTATE(shutdown)
	360
	361	static inline int64_t xfs_sum_freecounter(struct xfs_mount *mp,
	362	enum xfs_free_counter ctr)
	363	{
	364	if (ctr == XC_FREE_RTEXTENTS)
	365	return mp->m_sb.sb_frextents;
	366	return mp->m_sb.sb_fdblocks;
	367	}
	368
	369	static inline int64_t xfs_estimate_freecounter(struct xfs_mount *mp,
	370	enum xfs_free_counter ctr)
	371	{
	372	return xfs_sum_freecounter(mp, ctr);
	373	}
	374
	375	static inline int xfs_compare_freecounter(struct xfs_mount *mp,
	376	enum xfs_free_counter ctr, int64_t rhs, int32_t batch)
	377	{
	378	uint64_t count;
	379
	380	if (ctr == XC_FREE_RTEXTENTS)
	381	count = mp->m_sb.sb_frextents;
	382	else
	383	count = mp->m_sb.sb_fdblocks;
	384	if (count > rhs)
	385	return 1;
	386	else if (count < rhs)
	387	return -1;
	388	return 0;
	389	}
	390
	391	/* don't fail on device size or AG count checks */
	392	#define LIBXFS_MOUNT_DEBUGGER (1U << 0)
	393	/* report metadata corruption to stdout */
	394	#define LIBXFS_MOUNT_REPORT_CORRUPTION (1U << 1)
	395
	396	#define LIBXFS_BHASHSIZE(sbp) (1<<10)
	397
	398	void libxfs_compute_all_maxlevels(struct xfs_mount *mp);
	399	struct xfs_mount libxfs_mount(struct xfs_mount mp, struct xfs_sb *sb,
	400	struct libxfs_init *xi, unsigned int flags);
	401	int libxfs_flush_mount(struct xfs_mount *mp);
	402	int libxfs_umount(struct xfs_mount *mp);
	403	extern void libxfs_rtmount_destroy (xfs_mount_t *);
	404
	405	/* Dummy xfs_dquot so that libxfs compiles. */
	406	struct xfs_dquot {
	407	int q_type;
	408	};
	409
	410	typedef struct wait_queue_head {
	411	} wait_queue_head_t;
	412
	413	static inline void wake_up(wait_queue_head_t *wq) {}
	414
	415	struct xfs_defer_drain { /* empty */ };
	416
	417	#define xfs_defer_drain_init(dr) ((void)0)
	418	#define xfs_defer_drain_free(dr) ((void)0)
	419
	420	#define xfs_group_intent_get(mp, fsbno, type) \
	421	xfs_group_get_by_fsb((mp), (fsbno), (type))
	422	#define xfs_group_intent_put(xg) xfs_group_put(xg)
	423
	424	static inline void xfs_group_intent_hold(struct xfs_group *xg) {}
	425	static inline void xfs_group_intent_rele(struct xfs_group *xg) {}
	426
	427	static inline void libxfs_buftarg_drain(struct xfs_buftarg *btp)
	428	{
	429	cache_purge(btp->bcache);
	430	}
	431
	432	struct mnt_idmap {
	433	/* empty */
	434	};
	435
	436	/* bogus idmapping so that mkfs can do directory inheritance correctly */
	437	#define libxfs_nop_idmap ((struct mnt_idmap *)1)
	438
	439	#endif /* __XFS_MOUNT_H__ */