From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from aserp2120.oracle.com ([141.146.126.78]:56380 "EHLO aserp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751774AbeEOWd4 (ORCPT ); Tue, 15 May 2018 18:33:56 -0400 Subject: [PATCH 02/22] xfs: add helpers to allocate and initialize fresh btree roots From: "Darrick J. Wong" Date: Tue, 15 May 2018 15:33:51 -0700 Message-ID: <152642363169.1556.14593532407537096653.stgit@magnolia> In-Reply-To: <152642361893.1556.9335169821674946249.stgit@magnolia> References: <152642361893.1556.9335169821674946249.stgit@magnolia> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-xfs-owner@vger.kernel.org List-ID: List-Id: xfs To: darrick.wong@oracle.com Cc: linux-xfs@vger.kernel.org, david@fromorbit.com From: Darrick J. Wong 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 --- fs/xfs/scrub/repair.c | 81 +++++++++++++++++++++++++++++++++++++++++++++++++ fs/xfs/scrub/repair.h | 6 ++++ 2 files changed, 87 insertions(+) diff --git a/fs/xfs/scrub/repair.c b/fs/xfs/scrub/repair.c index 486e6e319b1f..72f04a717150 100644 --- a/fs/xfs/scrub/repair.c +++ b/fs/xfs/scrub/repair.c @@ -280,3 +280,84 @@ 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, + XFS_BTREE_CRC_BLOCKS); + 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; +} diff --git a/fs/xfs/scrub/repair.h b/fs/xfs/scrub/repair.h index 8d181dce6171..40990fa5f381 100644 --- a/fs/xfs/scrub/repair.h +++ b/fs/xfs/scrub/repair.h @@ -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 */