xfs: add helpers to allocate and initialize fresh btree roots (73d6b42a) · Commits · 戴 / test

fs/xfs/scrub/repair.c

+80 −0

Original line number	Diff line number	Diff line
		@@ -288,3 +288,83 @@ xfs_repair_calc_ag_resblks(

		return max(max(bnobt_sz, inobt_sz), max(rmapbt_sz, refcbt_sz));
		}

		/* Allocate a block in an AG. */
		int
		xfs_repair_alloc_ag_block(
		struct xfs_scrub_context *sc,
		struct xfs_owner_info *oinfo,
		xfs_fsblock_t *fsbno,
		enum xfs_ag_resv_type resv)
		{
		struct xfs_alloc_arg args = {0};
		xfs_agblock_t bno;
		int error;

		switch (resv) {
		case XFS_AG_RESV_AGFL:
		case XFS_AG_RESV_RMAPBT:
		error = xfs_alloc_get_freelist(sc->tp, sc->sa.agf_bp, &bno, 1);
		if (error)
		return error;
		if (bno == NULLAGBLOCK)
		return -ENOSPC;
		xfs_extent_busy_reuse(sc->mp, sc->sa.agno, bno,
		1, false);
		*fsbno = XFS_AGB_TO_FSB(sc->mp, sc->sa.agno, bno);
		if (resv == XFS_AG_RESV_RMAPBT)
		xfs_ag_resv_rmapbt_alloc(sc->mp, sc->sa.agno);
		return 0;
		default:
		break;
		}

		args.tp = sc->tp;
		args.mp = sc->mp;
		args.oinfo = *oinfo;
		args.fsbno = XFS_AGB_TO_FSB(args.mp, sc->sa.agno, 0);
		args.minlen = 1;
		args.maxlen = 1;
		args.prod = 1;
		args.type = XFS_ALLOCTYPE_THIS_AG;
		args.resv = resv;

		error = xfs_alloc_vextent(&args);
		if (error)
		return error;
		if (args.fsbno == NULLFSBLOCK)
		return -ENOSPC;
		ASSERT(args.len == 1);
		*fsbno = args.fsbno;

		return 0;
		}

		/* Initialize a new AG btree root block with zero entries. */
		int
		xfs_repair_init_btblock(
		struct xfs_scrub_context *sc,
		xfs_fsblock_t fsb,
		struct xfs_buf **bpp,
		xfs_btnum_t btnum,
		const struct xfs_buf_ops *ops)
		{
		struct xfs_trans *tp = sc->tp;
		struct xfs_mount *mp = sc->mp;
		struct xfs_buf *bp;

		trace_xfs_repair_init_btblock(mp, XFS_FSB_TO_AGNO(mp, fsb),
		XFS_FSB_TO_AGBNO(mp, fsb), btnum);

		ASSERT(XFS_FSB_TO_AGNO(mp, fsb) == sc->sa.agno);
		bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, XFS_FSB_TO_DADDR(mp, fsb),
		XFS_FSB_TO_BB(mp, 1), 0);
		xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
		xfs_btree_init_block(mp, bp, btnum, 0, 0, sc->sa.agno, 0);
		xfs_trans_buf_set_type(tp, bp, XFS_BLFT_BTREE_BUF);
		xfs_trans_log_buf(tp, bp, 0, bp->b_length);
		bp->b_ops = ops;
		*bpp = bp;

		return 0;
		}

fs/xfs/scrub/repair.h

+6 −0

Original line number	Diff line number	Diff line
		@@ -36,6 +36,12 @@ int xfs_repair_roll_ag_trans(struct xfs_scrub_context *sc);
		bool xfs_repair_ag_has_space(struct xfs_perag *pag, xfs_extlen_t nr_blocks,
		enum xfs_ag_resv_type type);
		xfs_extlen_t xfs_repair_calc_ag_resblks(struct xfs_scrub_context *sc);
		int xfs_repair_alloc_ag_block(struct xfs_scrub_context *sc,
		struct xfs_owner_info oinfo, xfs_fsblock_t fsbno,
		enum xfs_ag_resv_type resv);
		int xfs_repair_init_btblock(struct xfs_scrub_context *sc, xfs_fsblock_t fsb,
		struct xfs_buf **bpp, xfs_btnum_t btnum,
		const struct xfs_buf_ops *ops);

		/* Metadata repairers */

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