xfs: add support for refcount btree staging cursors (56e98164) · Commits · 戴 / test

fs/xfs/libxfs/xfs_refcount_btree.c

+60 −10

Original line number	Diff line number	Diff line
		@@ -12,6 +12,7 @@
		#include "xfs_sb.h"
		#include "xfs_mount.h"
		#include "xfs_btree.h"
		#include "xfs_btree_staging.h"
		#include "xfs_refcount_btree.h"
		#include "xfs_alloc.h"
		#include "xfs_error.h"
		@@ -311,41 +312,90 @@ static const struct xfs_btree_ops xfs_refcountbt_ops = {
		};

		/*
		* Allocate a new refcount btree cursor.
		* Initialize a new refcount btree cursor.
		*/
		struct xfs_btree_cur *
		xfs_refcountbt_init_cursor(
		static struct xfs_btree_cur *
		xfs_refcountbt_init_common(
		struct xfs_mount *mp,
		struct xfs_trans *tp,
		struct xfs_buf *agbp,
		xfs_agnumber_t agno)
		{
		struct xfs_agf *agf = agbp->b_addr;
		struct xfs_btree_cur *cur;

		ASSERT(agno != NULLAGNUMBER);
		ASSERT(agno < mp->m_sb.sb_agcount);
		cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_NOFS);

		cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_NOFS);
		cur->bc_tp = tp;
		cur->bc_mp = mp;
		cur->bc_btnum = XFS_BTNUM_REFC;
		cur->bc_blocklog = mp->m_sb.sb_blocklog;
		cur->bc_ops = &xfs_refcountbt_ops;
		cur->bc_statoff = XFS_STATS_CALC_INDEX(xs_refcbt_2);

		cur->bc_nlevels = be32_to_cpu(agf->agf_refcount_level);

		cur->bc_ag.agbp = agbp;
		cur->bc_ag.agno = agno;
		cur->bc_flags \|= XFS_BTREE_CRC_BLOCKS;

		cur->bc_ag.refc.nr_ops = 0;
		cur->bc_ag.refc.shape_changes = 0;
		cur->bc_ops = &xfs_refcountbt_ops;
		return cur;
		}

		/* Create a btree cursor. */
		struct xfs_btree_cur *
		xfs_refcountbt_init_cursor(
		struct xfs_mount *mp,
		struct xfs_trans *tp,
		struct xfs_buf *agbp,
		xfs_agnumber_t agno)
		{
		struct xfs_agf *agf = agbp->b_addr;
		struct xfs_btree_cur *cur;

		cur = xfs_refcountbt_init_common(mp, tp, agno);
		cur->bc_nlevels = be32_to_cpu(agf->agf_refcount_level);
		cur->bc_ag.agbp = agbp;
		return cur;
		}

		/* Create a btree cursor with a fake root for staging. */
		struct xfs_btree_cur *
		xfs_refcountbt_stage_cursor(
		struct xfs_mount *mp,
		struct xbtree_afakeroot *afake,
		xfs_agnumber_t agno)
		{
		struct xfs_btree_cur *cur;

		cur = xfs_refcountbt_init_common(mp, NULL, agno);
		xfs_btree_stage_afakeroot(cur, afake);
		return cur;
		}

		/*
		* Swap in the new btree root. Once we pass this point the newly rebuilt btree
		* is in place and we have to kill off all the old btree blocks.
		*/
		void
		xfs_refcountbt_commit_staged_btree(
		struct xfs_btree_cur *cur,
		struct xfs_trans *tp,
		struct xfs_buf *agbp)
		{
		struct xfs_agf *agf = agbp->b_addr;
		struct xbtree_afakeroot *afake = cur->bc_ag.afake;

		ASSERT(cur->bc_flags & XFS_BTREE_STAGING);

		agf->agf_refcount_root = cpu_to_be32(afake->af_root);
		agf->agf_refcount_level = cpu_to_be32(afake->af_levels);
		agf->agf_refcount_blocks = cpu_to_be32(afake->af_blocks);
		xfs_alloc_log_agf(tp, agbp, XFS_AGF_REFCOUNT_BLOCKS \|
		XFS_AGF_REFCOUNT_ROOT \|
		XFS_AGF_REFCOUNT_LEVEL);
		xfs_btree_commit_afakeroot(cur, tp, agbp, &xfs_refcountbt_ops);
		}

		/*
		* Calculate the number of records in a refcount btree block.
		*/

fs/xfs/libxfs/xfs_refcount_btree.h

+6 −0

Original line number	Diff line number	Diff line
		@@ -13,6 +13,7 @@
		struct xfs_buf;
		struct xfs_btree_cur;
		struct xfs_mount;
		struct xbtree_afakeroot;

		/*
		* Btree block header size
		@@ -46,6 +47,8 @@ struct xfs_mount;
		extern struct xfs_btree_cur xfs_refcountbt_init_cursor(struct xfs_mount mp,
		struct xfs_trans tp, struct xfs_buf agbp,
		xfs_agnumber_t agno);
		struct xfs_btree_cur xfs_refcountbt_stage_cursor(struct xfs_mount mp,
		struct xbtree_afakeroot *afake, xfs_agnumber_t agno);
		extern int xfs_refcountbt_maxrecs(int blocklen, bool leaf);
		extern void xfs_refcountbt_compute_maxlevels(struct xfs_mount *mp);

		@@ -58,4 +61,7 @@ extern int xfs_refcountbt_calc_reserves(struct xfs_mount *mp,
		struct xfs_trans tp, xfs_agnumber_t agno, xfs_extlen_t ask,
		xfs_extlen_t *used);

		void xfs_refcountbt_commit_staged_btree(struct xfs_btree_cur *cur,
		struct xfs_trans tp, struct xfs_buf agbp);

		#endif /* __XFS_REFCOUNT_BTREE_H__ */

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