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xfs: add support for refcount btree staging cursors

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Add support for btree staging cursors for the refcount btrees.  This
is needed both for online repair and also to convert xfs_repair to use
btree bulk loading.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
This commit is contained in:
Darrick J. Wong 2020-03-11 11:09:06 -07:00
parent c29ce8f48e
commit 56e98164ff
2 changed files with 75 additions and 19 deletions
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88
fs/xfs/libxfs/xfs_refcount_btree.c
View File

@ -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"
@ -311,8 +312,36 @@ static const struct xfs_btree_ops xfs_refcountbt_ops = {
};
/*
* Allocate a new refcount btree cursor.
* Initialize a new refcount btree cursor.
*/
static struct xfs_btree_cur *
xfs_refcountbt_init_common(
struct xfs_mount *mp,
struct xfs_trans *tp,
xfs_agnumber_t agno)
{
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->bc_tp = tp;
cur->bc_mp = mp;
cur->bc_btnum = XFS_BTNUM_REFC;
cur->bc_blocklog = mp->m_sb.sb_blocklog;
cur->bc_statoff = XFS_STATS_CALC_INDEX(xs_refcbt_2);
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,
@ -323,29 +352,50 @@ xfs_refcountbt_init_cursor(
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->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 = xfs_refcountbt_init_common(mp, tp, agno);
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;
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.
*/

6
fs/xfs/libxfs/xfs_refcount_btree.h
View File

@ -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__ */