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xfs: add support for rmap btree staging cursors

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Add support for btree staging cursors for the rmap 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 11:11:42 -07:00
parent 56e98164ff
commit 59d677127c
2 changed files with 67 additions and 15 deletions
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77
fs/xfs/libxfs/xfs_rmap_btree.c
View File

@ -14,6 +14,7 @@
#include "xfs_trans.h"
#include "xfs_alloc.h"
#include "xfs_btree.h"
#include "xfs_btree_staging.h"
#include "xfs_rmap.h"
#include "xfs_rmap_btree.h"
#include "xfs_trace.h"
@ -448,9 +449,29 @@ static const struct xfs_btree_ops xfs_rmapbt_ops = {
.recs_inorder = xfs_rmapbt_recs_inorder,
};
/*
* Allocate a new allocation btree cursor.
*/
static struct xfs_btree_cur *
xfs_rmapbt_init_common(
struct xfs_mount *mp,
struct xfs_trans *tp,
xfs_agnumber_t agno)
{
struct xfs_btree_cur *cur;
cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_NOFS);
cur->bc_tp = tp;
cur->bc_mp = mp;
/* Overlapping btree; 2 keys per pointer. */
cur->bc_btnum = XFS_BTNUM_RMAP;
cur->bc_flags = XFS_BTREE_CRC_BLOCKS | XFS_BTREE_OVERLAPPING;
cur->bc_blocklog = mp->m_sb.sb_blocklog;
cur->bc_statoff = XFS_STATS_CALC_INDEX(xs_rmap_2);
cur->bc_ag.agno = agno;
cur->bc_ops = &xfs_rmapbt_ops;
return cur;
}
/* Create a new reverse mapping btree cursor. */
struct xfs_btree_cur *
xfs_rmapbt_init_cursor(
struct xfs_mount *mp,
@ -461,23 +482,49 @@ xfs_rmapbt_init_cursor(
struct xfs_agf *agf = agbp->b_addr;
struct xfs_btree_cur *cur;
cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_NOFS);
cur->bc_tp = tp;
cur->bc_mp = mp;
/* Overlapping btree; 2 keys per pointer. */
cur->bc_btnum = XFS_BTNUM_RMAP;
cur->bc_flags = XFS_BTREE_CRC_BLOCKS | XFS_BTREE_OVERLAPPING;
cur->bc_blocklog = mp->m_sb.sb_blocklog;
cur->bc_ops = &xfs_rmapbt_ops;
cur = xfs_rmapbt_init_common(mp, tp, agno);
cur->bc_nlevels = be32_to_cpu(agf->agf_levels[XFS_BTNUM_RMAP]);
cur->bc_statoff = XFS_STATS_CALC_INDEX(xs_rmap_2);
cur->bc_ag.agbp = agbp;
cur->bc_ag.agno = agno;
return cur;
}
/* Create a new reverse mapping btree cursor with a fake root for staging. */
struct xfs_btree_cur *
xfs_rmapbt_stage_cursor(
struct xfs_mount *mp,
struct xbtree_afakeroot *afake,
xfs_agnumber_t agno)
{
struct xfs_btree_cur *cur;
cur = xfs_rmapbt_init_common(mp, NULL, agno);
xfs_btree_stage_afakeroot(cur, afake);
return cur;
}
/*
* Install a new reverse mapping btree root. Caller is responsible for
* invalidating and freeing the old btree blocks.
*/
void
xfs_rmapbt_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_roots[cur->bc_btnum] = cpu_to_be32(afake->af_root);
agf->agf_levels[cur->bc_btnum] = cpu_to_be32(afake->af_levels);
agf->agf_rmap_blocks = cpu_to_be32(afake->af_blocks);
xfs_alloc_log_agf(tp, agbp, XFS_AGF_ROOTS | XFS_AGF_LEVELS |
XFS_AGF_RMAP_BLOCKS);
xfs_btree_commit_afakeroot(cur, tp, agbp, &xfs_rmapbt_ops);
}
/*
* Calculate number of records in an rmap btree block.
*/

5
fs/xfs/libxfs/xfs_rmap_btree.h
View File

@ -9,6 +9,7 @@
struct xfs_buf;
struct xfs_btree_cur;
struct xfs_mount;
struct xbtree_afakeroot;
/* rmaps only exist on crc enabled filesystems */
#define XFS_RMAP_BLOCK_LEN XFS_BTREE_SBLOCK_CRC_LEN
@ -43,6 +44,10 @@ struct xfs_mount;
struct xfs_btree_cur *xfs_rmapbt_init_cursor(struct xfs_mount *mp,
struct xfs_trans *tp, struct xfs_buf *bp,
xfs_agnumber_t agno);
struct xfs_btree_cur *xfs_rmapbt_stage_cursor(struct xfs_mount *mp,
struct xbtree_afakeroot *afake, xfs_agnumber_t agno);
void xfs_rmapbt_commit_staged_btree(struct xfs_btree_cur *cur,
struct xfs_trans *tp, struct xfs_buf *agbp);
int xfs_rmapbt_maxrecs(int blocklen, int leaf);
extern void xfs_rmapbt_compute_maxlevels(struct xfs_mount *mp);