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Commit 14861c47 authored May 09, 2018 by Darrick J. Wong

xfs: add helpers to calculate btree size



Add a bunch of helper functions that calculate the sizes of various
btrees.  These will be used to repair btrees and btree headers.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>

parent 9d9c9028

fs/xfs/libxfs/xfs_alloc_btree.c

+9 −0

Original line number	Original line	Diff line number	Diff line
	@@ -547,3 +547,12 @@ xfs_allocbt_maxrecs(
	return blocklen / sizeof(xfs_alloc_rec_t);		return blocklen / sizeof(xfs_alloc_rec_t);
	return blocklen / (sizeof(xfs_alloc_key_t) + sizeof(xfs_alloc_ptr_t));		return blocklen / (sizeof(xfs_alloc_key_t) + sizeof(xfs_alloc_ptr_t));
	}		}

			/* Calculate the freespace btree size for some records. */
			xfs_extlen_t
			xfs_allocbt_calc_size(
			struct xfs_mount *mp,
			unsigned long long len)
			{
			return xfs_btree_calc_size(mp->m_alloc_mnr, len);
			}

fs/xfs/libxfs/xfs_alloc_btree.h

+2 −0

Original line number	Original line	Diff line number	Diff line
	@@ -61,5 +61,7 @@ extern struct xfs_btree_cur xfs_allocbt_init_cursor(struct xfs_mount ,
	struct xfs_trans , struct xfs_buf ,		struct xfs_trans , struct xfs_buf ,
	xfs_agnumber_t, xfs_btnum_t);		xfs_agnumber_t, xfs_btnum_t);
	extern int xfs_allocbt_maxrecs(struct xfs_mount *, int, int);		extern int xfs_allocbt_maxrecs(struct xfs_mount *, int, int);
			extern xfs_extlen_t xfs_allocbt_calc_size(struct xfs_mount *mp,
			unsigned long long len);

	#endif /* __XFS_ALLOC_BTREE_H__ */		#endif /* __XFS_ALLOC_BTREE_H__ */

fs/xfs/libxfs/xfs_bmap_btree.c

+9 −0

Original line number	Original line	Diff line number	Diff line
	@@ -660,3 +660,12 @@ xfs_bmbt_change_owner(
	xfs_btree_del_cursor(cur, error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);		xfs_btree_del_cursor(cur, error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
	return error;		return error;
	}		}

			/* Calculate the bmap btree size for some records. */
			unsigned long long
			xfs_bmbt_calc_size(
			struct xfs_mount *mp,
			unsigned long long len)
			{
			return xfs_btree_calc_size(mp->m_bmap_dmnr, len);
			}

fs/xfs/libxfs/xfs_bmap_btree.h

+3 −0

Original line number	Original line	Diff line number	Diff line
	@@ -118,4 +118,7 @@ extern int xfs_bmbt_change_owner(struct xfs_trans tp, struct xfs_inode ip,
	extern struct xfs_btree_cur xfs_bmbt_init_cursor(struct xfs_mount ,		extern struct xfs_btree_cur xfs_bmbt_init_cursor(struct xfs_mount ,
	struct xfs_trans , struct xfs_inode , int);		struct xfs_trans , struct xfs_inode , int);

			extern unsigned long long xfs_bmbt_calc_size(struct xfs_mount *mp,
			unsigned long long len);

	#endif /* __XFS_BMAP_BTREE_H__ */		#endif /* __XFS_BMAP_BTREE_H__ */

fs/xfs/libxfs/xfs_btree.c

+2 −2

Original line number	Original line	Diff line number	Diff line
	@@ -4836,14 +4836,14 @@ xfs_btree_query_all(
	* Calculate the number of blocks needed to store a given number of records		* Calculate the number of blocks needed to store a given number of records
	* in a short-format (per-AG metadata) btree.		* in a short-format (per-AG metadata) btree.
	*/		*/
	xfs_extlen_t		unsigned long long
	xfs_btree_calc_size(		xfs_btree_calc_size(
	uint *limits,		uint *limits,
	unsigned long long len)		unsigned long long len)
	{		{
	int level;		int level;
	int maxrecs;		int maxrecs;
	xfs_extlen_t rval;		unsigned long long rval;

	maxrecs = limits[0];		maxrecs = limits[0];
	for (level = 0, rval = 0; len > 1; level++) {		for (level = 0, rval = 0; len > 1; level++) {