xfs_btree.h

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	xfs_agblock_t		ptr,	/* btree block disk address */
	int			level);	/* btree block level */

/*
 * Delete the btree cursor.
 */
void
xfs_btree_del_cursor(
	xfs_btree_cur_t		*cur,	/* btree cursor */
	int			error);	/* del because of error */

/*
 * Duplicate the btree cursor.
 * Allocate a new one, copy the record, re-get the buffers.
 */
int					/* error */
xfs_btree_dup_cursor(
	xfs_btree_cur_t		*cur,	/* input cursor */
	xfs_btree_cur_t		**ncur);/* output cursor */

/*
 * Change the cursor to point to the first record in the current block
 * at the given level.  Other levels are unaffected.
 */
int					/* success=1, failure=0 */
xfs_btree_firstrec(
	xfs_btree_cur_t		*cur,	/* btree cursor */
	int			level);	/* level to change */

/*
 * Retrieve the block pointer from the cursor at the given level.
 * This may be a bmap btree root or from a buffer.
 */
xfs_btree_block_t *			/* generic btree block pointer */
xfs_btree_get_block(
	xfs_btree_cur_t		*cur,	/* btree cursor */
	int			level,	/* level in btree */
	struct xfs_buf		**bpp);	/* buffer containing the block */

/*
 * Get a buffer for the block, return it with no data read.
 * Long-form addressing.
 */
struct xfs_buf *				/* buffer for fsbno */
xfs_btree_get_bufl(
	struct xfs_mount	*mp,	/* file system mount point */
	struct xfs_trans	*tp,	/* transaction pointer */
	xfs_fsblock_t		fsbno,	/* file system block number */
	uint			lock);	/* lock flags for get_buf */

/*
 * Get a buffer for the block, return it with no data read.
 * Short-form addressing.
 */
struct xfs_buf *				/* buffer for agno/agbno */
xfs_btree_get_bufs(
	struct xfs_mount	*mp,	/* file system mount point */
	struct xfs_trans	*tp,	/* transaction pointer */
	xfs_agnumber_t		agno,	/* allocation group number */
	xfs_agblock_t		agbno,	/* allocation group block number */
	uint			lock);	/* lock flags for get_buf */

/*
 * Allocate a new btree cursor.
 * The cursor is either for allocation (A) or bmap (B).
 */
xfs_btree_cur_t *			/* new btree cursor */
xfs_btree_init_cursor(
	struct xfs_mount	*mp,	/* file system mount point */
	struct xfs_trans	*tp,	/* transaction pointer */
	struct xfs_buf		*agbp,	/* (A only) buffer for agf structure */
	xfs_agnumber_t		agno,	/* (A only) allocation group number */
	xfs_btnum_t		btnum,	/* btree identifier */
	struct xfs_inode	*ip,	/* (B only) inode owning the btree */
	int			whichfork); /* (B only) data/attr fork */

/*
 * Check for the cursor referring to the last block at the given level.
 */
int					/* 1=is last block, 0=not last block */
xfs_btree_islastblock(
	xfs_btree_cur_t		*cur,	/* btree cursor */
	int			level);	/* level to check */

/*
 * Change the cursor to point to the last record in the current block
 * at the given level.  Other levels are unaffected.
 */
int					/* success=1, failure=0 */
xfs_btree_lastrec(
	xfs_btree_cur_t		*cur,	/* btree cursor */
	int			level);	/* level to change */

/*
 * Compute first and last byte offsets for the fields given.
 * Interprets the offsets table, which contains struct field offsets.
 */
void
xfs_btree_offsets(
	__int64_t		fields,	/* bitmask of fields */
	const short		*offsets,/* table of field offsets */
	int			nbits,	/* number of bits to inspect */
	int			*first,	/* output: first byte offset */
	int			*last);	/* output: last byte offset */

/*
 * Get a buffer for the block, return it read in.
 * Long-form addressing.
 */
int					/* error */
xfs_btree_read_bufl(
	struct xfs_mount	*mp,	/* file system mount point */
	struct xfs_trans	*tp,	/* transaction pointer */
	xfs_fsblock_t		fsbno,	/* file system block number */
	uint			lock,	/* lock flags for read_buf */
	struct xfs_buf		**bpp,	/* buffer for fsbno */
	int			refval);/* ref count value for buffer */

/*
 * Get a buffer for the block, return it read in.
 * Short-form addressing.
 */
int					/* error */
xfs_btree_read_bufs(
	struct xfs_mount	*mp,	/* file system mount point */
	struct xfs_trans	*tp,	/* transaction pointer */
	xfs_agnumber_t		agno,	/* allocation group number */
	xfs_agblock_t		agbno,	/* allocation group block number */
	uint			lock,	/* lock flags for read_buf */
	struct xfs_buf		**bpp,	/* buffer for agno/agbno */
	int			refval);/* ref count value for buffer */

/*
 * Read-ahead the block, don't wait for it, don't return a buffer.
 * Long-form addressing.
 */
void					/* error */
xfs_btree_reada_bufl(
	struct xfs_mount	*mp,	/* file system mount point */
	xfs_fsblock_t		fsbno,	/* file system block number */
	xfs_extlen_t		count);	/* count of filesystem blocks */

/*
 * Read-ahead the block, don't wait for it, don't return a buffer.
 * Short-form addressing.
 */
void					/* error */
xfs_btree_reada_bufs(
	struct xfs_mount	*mp,	/* file system mount point */
	xfs_agnumber_t		agno,	/* allocation group number */
	xfs_agblock_t		agbno,	/* allocation group block number */
	xfs_extlen_t		count);	/* count of filesystem blocks */

/*
 * Read-ahead btree blocks, at the given level.
 * Bits in lr are set from XFS_BTCUR_{LEFT,RIGHT}RA.
 */
int					/* readahead block count */
xfs_btree_readahead_core(
	xfs_btree_cur_t		*cur,	/* btree cursor */
	int			lev,	/* level in btree */
	int			lr);	/* left/right bits */

static inline int			/* readahead block count */
xfs_btree_readahead(
	xfs_btree_cur_t		*cur,	/* btree cursor */
	int			lev,	/* level in btree */
	int			lr)	/* left/right bits */
{
	if ((cur->bc_ra[lev] | lr) == cur->bc_ra[lev])
		return 0;

	return xfs_btree_readahead_core(cur, lev, lr);
}


/*
 * Set the buffer for level "lev" in the cursor to bp, releasing
 * any previous buffer.
 */
void
xfs_btree_setbuf(
	xfs_btree_cur_t		*cur,	/* btree cursor */
	int			lev,	/* level in btree */
	struct xfs_buf		*bp);	/* new buffer to set */

#endif	/* __KERNEL__ */


/*
 * Min and max functions for extlen, agblock, fileoff, and filblks types.
 */
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_EXTLEN_MIN)
xfs_extlen_t xfs_extlen_min(xfs_extlen_t a, xfs_extlen_t b);
#define	XFS_EXTLEN_MIN(a,b)	xfs_extlen_min(a,b)
#else
#define	XFS_EXTLEN_MIN(a,b)	\
	((xfs_extlen_t)(a) < (xfs_extlen_t)(b) ? \
	 (xfs_extlen_t)(a) : (xfs_extlen_t)(b))
#endif
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_EXTLEN_MAX)
xfs_extlen_t xfs_extlen_max(xfs_extlen_t a, xfs_extlen_t b);
#define	XFS_EXTLEN_MAX(a,b)	xfs_extlen_max(a,b)
#else
#define	XFS_EXTLEN_MAX(a,b)	\
	((xfs_extlen_t)(a) > (xfs_extlen_t)(b) ? \
	 (xfs_extlen_t)(a) : (xfs_extlen_t)(b))
#endif

#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_AGBLOCK_MIN)
xfs_agblock_t xfs_agblock_min(xfs_agblock_t a, xfs_agblock_t b);
#define	XFS_AGBLOCK_MIN(a,b)	xfs_agblock_min(a,b)
#else
#define	XFS_AGBLOCK_MIN(a,b)	\
	((xfs_agblock_t)(a) < (xfs_agblock_t)(b) ? \
	 (xfs_agblock_t)(a) : (xfs_agblock_t)(b))
#endif
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_AGBLOCK_MAX)
xfs_agblock_t xfs_agblock_max(xfs_agblock_t a, xfs_agblock_t b);
#define	XFS_AGBLOCK_MAX(a,b)	xfs_agblock_max(a,b)
#else
#define	XFS_AGBLOCK_MAX(a,b)	\
	((xfs_agblock_t)(a) > (xfs_agblock_t)(b) ? \
	 (xfs_agblock_t)(a) : (xfs_agblock_t)(b))
#endif

#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_FILEOFF_MIN)
xfs_fileoff_t xfs_fileoff_min(xfs_fileoff_t a, xfs_fileoff_t b);
#define	XFS_FILEOFF_MIN(a,b)	xfs_fileoff_min(a,b)
#else
#define	XFS_FILEOFF_MIN(a,b)	\
	((xfs_fileoff_t)(a) < (xfs_fileoff_t)(b) ? \
	 (xfs_fileoff_t)(a) : (xfs_fileoff_t)(b))
#endif
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_FILEOFF_MAX)
xfs_fileoff_t xfs_fileoff_max(xfs_fileoff_t a, xfs_fileoff_t b);
#define	XFS_FILEOFF_MAX(a,b)	xfs_fileoff_max(a,b)
#else
#define	XFS_FILEOFF_MAX(a,b)	\
	((xfs_fileoff_t)(a) > (xfs_fileoff_t)(b) ? \
	 (xfs_fileoff_t)(a) : (xfs_fileoff_t)(b))
#endif

#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_FILBLKS_MIN)
xfs_filblks_t xfs_filblks_min(xfs_filblks_t a, xfs_filblks_t b);
#define	XFS_FILBLKS_MIN(a,b)	xfs_filblks_min(a,b)
#else
#define	XFS_FILBLKS_MIN(a,b)	\
	((xfs_filblks_t)(a) < (xfs_filblks_t)(b) ? \
	 (xfs_filblks_t)(a) : (xfs_filblks_t)(b))
#endif
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_FILBLKS_MAX)
xfs_filblks_t xfs_filblks_max(xfs_filblks_t a, xfs_filblks_t b);
#define	XFS_FILBLKS_MAX(a,b)	xfs_filblks_max(a,b)
#else
#define	XFS_FILBLKS_MAX(a,b)	\
	((xfs_filblks_t)(a) > (xfs_filblks_t)(b) ? \
	 (xfs_filblks_t)(a) : (xfs_filblks_t)(b))
#endif
#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_FSB_SANITY_CHECK)
int xfs_fsb_sanity_check(struct xfs_mount *mp, xfs_fsblock_t fsb);
#define	XFS_FSB_SANITY_CHECK(mp,fsb)	xfs_fsb_sanity_check(mp,fsb)
#else
#define	XFS_FSB_SANITY_CHECK(mp,fsb)	\
	(XFS_FSB_TO_AGNO(mp, fsb) < mp->m_sb.sb_agcount && \
	 XFS_FSB_TO_AGBNO(mp, fsb) < mp->m_sb.sb_agblocks)
#endif

/*
 * Macros to set EFSCORRUPTED & return/branch.
 */
#define	XFS_WANT_CORRUPTED_GOTO(x,l)	\
	{ \
		int fs_is_ok = (x); \
		ASSERT(fs_is_ok); \
		if (unlikely(!fs_is_ok)) { \
			XFS_ERROR_REPORT("XFS_WANT_CORRUPTED_GOTO", \
					 XFS_ERRLEVEL_LOW, NULL); \
			error = XFS_ERROR(EFSCORRUPTED); \
			goto l; \
		} \
	}

#define	XFS_WANT_CORRUPTED_RETURN(x)	\
	{ \
		int fs_is_ok = (x); \
		ASSERT(fs_is_ok); \
		if (unlikely(!fs_is_ok)) { \
			XFS_ERROR_REPORT("XFS_WANT_CORRUPTED_RETURN", \
					 XFS_ERRLEVEL_LOW, NULL); \
			return XFS_ERROR(EFSCORRUPTED); \
		} \
	}

#endif	/* __XFS_BTREE_H__ */