fs/xfs/libxfs/xfs_types.h

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

typedef uint32_t	prid_t;		/* project ID */

typedef uint32_t	xfs_agblock_t;	/* blockno in alloc. group */
typedef uint32_t	xfs_agino_t;	/* inode # within allocation grp */
typedef uint32_t	xfs_extlen_t;	/* extent length in blocks */
typedef uint32_t	xfs_rtxlen_t;	/* file extent length in rtextents */
typedef uint32_t	xfs_agnumber_t;	/* allocation group number */
typedef uint64_t	xfs_extnum_t;	/* # of extents in a file */
typedef uint32_t	xfs_aextnum_t;	/* # extents in an attribute fork */
typedef int64_t		xfs_fsize_t;	/* bytes in a file */
typedef uint64_t	xfs_ufsize_t;	/* unsigned bytes in a file */

typedef int32_t		xfs_suminfo_t;	/* type of bitmap summary info */
typedef uint32_t	xfs_rtsumoff_t;	/* offset of an rtsummary info word */
typedef uint32_t	xfs_rtword_t;	/* word type for bitmap manipulations */

typedef int64_t		xfs_lsn_t;	/* log sequence number */
typedef int64_t		xfs_csn_t;	/* CIL sequence number */

typedef uint32_t	xfs_dablk_t;	/* dir/attr block number (in file) */
typedef uint32_t	xfs_dahash_t;	/* dir/attr hash value */

typedef uint64_t	xfs_fsblock_t;	/* blockno in filesystem (agno|agbno) */
typedef uint64_t	xfs_rfsblock_t;	/* blockno in filesystem (raw) */
typedef uint64_t	xfs_rtblock_t;	/* extent (block) in realtime area */
typedef uint64_t	xfs_fileoff_t;	/* block number in a file */
typedef uint64_t	xfs_filblks_t;	/* number of blocks in a file */
typedef uint64_t	xfs_rtxnum_t;	/* rtextent number */
typedef uint64_t	xfs_rtbxlen_t;	/* rtbitmap extent length in rtextents */

typedef int64_t		xfs_srtblock_t;	/* signed version of xfs_rtblock_t */

/*
 * New verifiers will return the instruction address of the failing check.
 * NULL means everything is ok.
 */
typedef void *		xfs_failaddr_t;

/*
 * Null values for the types.
 */
#define	NULLFSBLOCK	((xfs_fsblock_t)-1)
#define	NULLRFSBLOCK	((xfs_rfsblock_t)-1)
#define	NULLRTBLOCK	((xfs_rtblock_t)-1)
#define	NULLFILEOFF	((xfs_fileoff_t)-1)

#define	NULLAGBLOCK	((xfs_agblock_t)-1)
#define	NULLAGNUMBER	((xfs_agnumber_t)-1)

#define NULLCOMMITLSN	((xfs_lsn_t)-1)

#define	NULLFSINO	((xfs_ino_t)-1)
#define	NULLAGINO	((xfs_agino_t)-1)

/*
 * Minimum and maximum blocksize and sectorsize.
 * The blocksize upper limit is pretty much arbitrary.
 * The sectorsize upper limit is due to sizeof(sb_sectsize).
 * CRC enable filesystems use 512 byte inodes, meaning 512 byte block sizes
 * cannot be used.
 */
#define XFS_MIN_BLOCKSIZE_LOG	9	/* i.e. 512 bytes */
#define XFS_MAX_BLOCKSIZE_LOG	16	/* i.e. 65536 bytes */
#define XFS_MIN_BLOCKSIZE	(1 << XFS_MIN_BLOCKSIZE_LOG)
#define XFS_MAX_BLOCKSIZE	(1 << XFS_MAX_BLOCKSIZE_LOG)
#define XFS_MIN_CRC_BLOCKSIZE	(1 << (XFS_MIN_BLOCKSIZE_LOG + 1))
#define XFS_MIN_SECTORSIZE_LOG	9	/* i.e. 512 bytes */
#define XFS_MAX_SECTORSIZE_LOG	15	/* i.e. 32768 bytes */
#define XFS_MIN_SECTORSIZE	(1 << XFS_MIN_SECTORSIZE_LOG)
#define XFS_MAX_SECTORSIZE	(1 << XFS_MAX_SECTORSIZE_LOG)

/*
 * Inode fork identifiers.
 */
#define XFS_STAGING_FORK	(-1)	/* fake fork for staging a btree */
#define	XFS_DATA_FORK		(0)
#define	XFS_ATTR_FORK		(1)
#define	XFS_COW_FORK		(2)

#define XFS_WHICHFORK_STRINGS \
	{ XFS_STAGING_FORK, 	"staging" }, \
	{ XFS_DATA_FORK, 	"data" }, \
	{ XFS_ATTR_FORK,	"attr" }, \
	{ XFS_COW_FORK,		"cow" }

/*
 * Min numbers of data/attr fork btree root pointers.
 */
#define MINDBTPTRS	3
#define MINABTPTRS	2

/*
 * MAXNAMELEN is the length (including the terminating null) of
 * the longest permissible file (component) name.
 */
#define MAXNAMELEN	256

/*
 * This enum is used in string mapping in xfs_trace.h; please keep the
 * TRACE_DEFINE_ENUMs for it up to date.
 */
typedef enum {
	XFS_LOOKUP_EQi, XFS_LOOKUP_LEi, XFS_LOOKUP_GEi
} xfs_lookup_t;

#define XFS_AG_BTREE_CMP_FORMAT_STR \
	{ XFS_LOOKUP_EQi,	"eq" }, \
	{ XFS_LOOKUP_LEi,	"le" }, \
	{ XFS_LOOKUP_GEi,	"ge" }

struct xfs_name {
	const unsigned char	*name;
	int			len;
	int			type;
};

/*
 * uid_t and gid_t are hard-coded to 32 bits in the inode.
 * Hence, an 'id' in a dquot is 32 bits..
 */
typedef uint32_t	xfs_dqid_t;

/*
 * Constants for bit manipulations.
 */
#define	XFS_NBBYLOG	3		/* log2(NBBY) */
#define	XFS_WORDLOG	2		/* log2(sizeof(xfs_rtword_t)) */
#define	XFS_SUMINFOLOG	2		/* log2(sizeof(xfs_suminfo_t)) */
#define	XFS_NBWORDLOG	(XFS_NBBYLOG + XFS_WORDLOG)
#define	XFS_NBWORD	(1 << XFS_NBWORDLOG)
#define	XFS_WORDMASK	((1 << XFS_WORDLOG) - 1)

struct xfs_iext_cursor {
	struct xfs_iext_leaf	*leaf;
	int			pos;
};

typedef enum {
	XFS_EXT_NORM, XFS_EXT_UNWRITTEN,
} xfs_exntst_t;

typedef struct xfs_bmbt_irec
{
	xfs_fileoff_t	br_startoff;	/* starting file offset */
	xfs_fsblock_t	br_startblock;	/* starting block number */
	xfs_filblks_t	br_blockcount;	/* number of blocks */
	xfs_exntst_t	br_state;	/* extent state */
} xfs_bmbt_irec_t;

enum xfs_refc_domain {
	XFS_REFC_DOMAIN_SHARED = 0,
	XFS_REFC_DOMAIN_COW,
};

#define XFS_REFC_DOMAIN_STRINGS \
	{ XFS_REFC_DOMAIN_SHARED,	"shared" }, \
	{ XFS_REFC_DOMAIN_COW,		"cow" }

struct xfs_refcount_irec {
	xfs_agblock_t	rc_startblock;	/* starting block number */
	xfs_extlen_t	rc_blockcount;	/* count of free blocks */
	xfs_nlink_t	rc_refcount;	/* number of inodes linked here */
	enum xfs_refc_domain	rc_domain; /* shared or cow staging extent? */
};

#define XFS_RMAP_ATTR_FORK		(1 << 0)
#define XFS_RMAP_BMBT_BLOCK		(1 << 1)
#define XFS_RMAP_UNWRITTEN		(1 << 2)
#define XFS_RMAP_KEY_FLAGS		(XFS_RMAP_ATTR_FORK | \
					 XFS_RMAP_BMBT_BLOCK)
#define XFS_RMAP_REC_FLAGS		(XFS_RMAP_UNWRITTEN)
struct xfs_rmap_irec {
	xfs_agblock_t	rm_startblock;	/* extent start block */
	xfs_extlen_t	rm_blockcount;	/* extent length */
	uint64_t	rm_owner;	/* extent owner */
	uint64_t	rm_offset;	/* offset within the owner */
	unsigned int	rm_flags;	/* state flags */
};

/* per-AG block reservation types */
enum xfs_ag_resv_type {
	XFS_AG_RESV_NONE = 0,
	XFS_AG_RESV_AGFL,
	XFS_AG_RESV_METADATA,
	XFS_AG_RESV_RMAPBT,

	/*
	 * Don't increase fdblocks when freeing extent.  This is a pony for
	 * the bnobt repair functions to re-free the free space without
	 * altering fdblocks.  If you think you need this you're wrong.
	 */
	XFS_AG_RESV_IGNORE,
};

/* Results of scanning a btree keyspace to check occupancy. */
enum xbtree_recpacking {
	/* None of the keyspace maps to records. */
	XBTREE_RECPACKING_EMPTY = 0,

	/* Some, but not all, of the keyspace maps to records. */
	XBTREE_RECPACKING_SPARSE,

	/* The entire keyspace maps to records. */
	XBTREE_RECPACKING_FULL,
};

/*
 * Type verifier functions
 */
struct xfs_mount;

bool xfs_verify_fsbno(struct xfs_mount *mp, xfs_fsblock_t fsbno);
bool xfs_verify_fsbext(struct xfs_mount *mp, xfs_fsblock_t fsbno,
		xfs_fsblock_t len);

bool xfs_verify_ino(struct xfs_mount *mp, xfs_ino_t ino);
bool xfs_internal_inum(struct xfs_mount *mp, xfs_ino_t ino);
bool xfs_verify_dir_ino(struct xfs_mount *mp, xfs_ino_t ino);
bool xfs_verify_rtbno(struct xfs_mount *mp, xfs_rtblock_t rtbno);
bool xfs_verify_rtbext(struct xfs_mount *mp, xfs_rtblock_t rtbno,
		xfs_filblks_t len);
bool xfs_verify_icount(struct xfs_mount *mp, unsigned long long icount);
bool xfs_verify_dablk(struct xfs_mount *mp, xfs_fileoff_t off);
void xfs_icount_range(struct xfs_mount *mp, unsigned long long *min,
		unsigned long long *max);
bool xfs_verify_fileoff(struct xfs_mount *mp, xfs_fileoff_t off);
bool xfs_verify_fileext(struct xfs_mount *mp, xfs_fileoff_t off,
		xfs_fileoff_t len);

/* Do we support an rt volume having this number of rtextents? */
static inline bool
xfs_validate_rtextents(
	xfs_rtbxlen_t		rtextents)
{
	/* No runt rt volumes */
	if (rtextents == 0)
		return false;

	return true;
}

#endif	/* __XFS_TYPES_H__ */