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xfs: add helpers to allocate and initialize fresh btree roots
Add a pair of helper functions to allocate and initialize fresh btree roots. The repair functions will use these as part of recreating corrupted metadata. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Allison Henderson <allison.henderson@oracle.com>
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2 changed files with 86 additions and 0 deletions
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@ -288,3 +288,83 @@ xfs_repair_calc_ag_resblks(
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return max(max(bnobt_sz, inobt_sz), max(rmapbt_sz, refcbt_sz));
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}
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/* Allocate a block in an AG. */
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int
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xfs_repair_alloc_ag_block(
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struct xfs_scrub_context *sc,
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struct xfs_owner_info *oinfo,
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xfs_fsblock_t *fsbno,
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enum xfs_ag_resv_type resv)
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{
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struct xfs_alloc_arg args = {0};
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xfs_agblock_t bno;
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int error;
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switch (resv) {
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case XFS_AG_RESV_AGFL:
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case XFS_AG_RESV_RMAPBT:
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error = xfs_alloc_get_freelist(sc->tp, sc->sa.agf_bp, &bno, 1);
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if (error)
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return error;
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if (bno == NULLAGBLOCK)
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return -ENOSPC;
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xfs_extent_busy_reuse(sc->mp, sc->sa.agno, bno,
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1, false);
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*fsbno = XFS_AGB_TO_FSB(sc->mp, sc->sa.agno, bno);
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if (resv == XFS_AG_RESV_RMAPBT)
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xfs_ag_resv_rmapbt_alloc(sc->mp, sc->sa.agno);
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return 0;
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default:
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break;
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}
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args.tp = sc->tp;
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args.mp = sc->mp;
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args.oinfo = *oinfo;
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args.fsbno = XFS_AGB_TO_FSB(args.mp, sc->sa.agno, 0);
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args.minlen = 1;
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args.maxlen = 1;
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args.prod = 1;
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args.type = XFS_ALLOCTYPE_THIS_AG;
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args.resv = resv;
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error = xfs_alloc_vextent(&args);
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if (error)
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return error;
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if (args.fsbno == NULLFSBLOCK)
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return -ENOSPC;
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ASSERT(args.len == 1);
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*fsbno = args.fsbno;
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return 0;
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}
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/* Initialize a new AG btree root block with zero entries. */
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int
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xfs_repair_init_btblock(
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struct xfs_scrub_context *sc,
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xfs_fsblock_t fsb,
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struct xfs_buf **bpp,
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xfs_btnum_t btnum,
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const struct xfs_buf_ops *ops)
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{
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struct xfs_trans *tp = sc->tp;
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struct xfs_mount *mp = sc->mp;
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struct xfs_buf *bp;
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trace_xfs_repair_init_btblock(mp, XFS_FSB_TO_AGNO(mp, fsb),
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XFS_FSB_TO_AGBNO(mp, fsb), btnum);
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ASSERT(XFS_FSB_TO_AGNO(mp, fsb) == sc->sa.agno);
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bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, XFS_FSB_TO_DADDR(mp, fsb),
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XFS_FSB_TO_BB(mp, 1), 0);
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xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
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xfs_btree_init_block(mp, bp, btnum, 0, 0, sc->sa.agno, 0);
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xfs_trans_buf_set_type(tp, bp, XFS_BLFT_BTREE_BUF);
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xfs_trans_log_buf(tp, bp, 0, bp->b_length);
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bp->b_ops = ops;
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*bpp = bp;
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return 0;
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}
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@ -36,6 +36,12 @@ int xfs_repair_roll_ag_trans(struct xfs_scrub_context *sc);
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bool xfs_repair_ag_has_space(struct xfs_perag *pag, xfs_extlen_t nr_blocks,
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enum xfs_ag_resv_type type);
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xfs_extlen_t xfs_repair_calc_ag_resblks(struct xfs_scrub_context *sc);
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int xfs_repair_alloc_ag_block(struct xfs_scrub_context *sc,
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struct xfs_owner_info *oinfo, xfs_fsblock_t *fsbno,
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enum xfs_ag_resv_type resv);
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int xfs_repair_init_btblock(struct xfs_scrub_context *sc, xfs_fsblock_t fsb,
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struct xfs_buf **bpp, xfs_btnum_t btnum,
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const struct xfs_buf_ops *ops);
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/* Metadata repairers */
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