xfs: repair the AGFL
Repair the AGFL from the rmap data. 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
parent
f9ed6debca
commit
0e93d3f43e
@ -433,3 +433,284 @@ out_revert:
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memcpy(agf, &old_agf, sizeof(old_agf));
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return error;
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}
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/* AGFL */
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struct xrep_agfl {
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/* Bitmap of other OWN_AG metadata blocks. */
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struct xfs_bitmap agmetablocks;
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/* Bitmap of free space. */
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struct xfs_bitmap *freesp;
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struct xfs_scrub *sc;
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};
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/* Record all OWN_AG (free space btree) information from the rmap data. */
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STATIC int
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xrep_agfl_walk_rmap(
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struct xfs_btree_cur *cur,
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struct xfs_rmap_irec *rec,
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void *priv)
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{
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struct xrep_agfl *ra = priv;
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xfs_fsblock_t fsb;
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int error = 0;
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if (xchk_should_terminate(ra->sc, &error))
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return error;
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/* Record all the OWN_AG blocks. */
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if (rec->rm_owner == XFS_RMAP_OWN_AG) {
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fsb = XFS_AGB_TO_FSB(cur->bc_mp, cur->bc_private.a.agno,
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rec->rm_startblock);
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error = xfs_bitmap_set(ra->freesp, fsb, rec->rm_blockcount);
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if (error)
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return error;
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}
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return xfs_bitmap_set_btcur_path(&ra->agmetablocks, cur);
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}
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/*
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* Map out all the non-AGFL OWN_AG space in this AG so that we can deduce
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* which blocks belong to the AGFL.
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*
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* Compute the set of old AGFL blocks by subtracting from the list of OWN_AG
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* blocks the list of blocks owned by all other OWN_AG metadata (bnobt, cntbt,
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* rmapbt). These are the old AGFL blocks, so return that list and the number
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* of blocks we're actually going to put back on the AGFL.
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*/
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STATIC int
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xrep_agfl_collect_blocks(
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struct xfs_scrub *sc,
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struct xfs_buf *agf_bp,
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struct xfs_bitmap *agfl_extents,
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xfs_agblock_t *flcount)
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{
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struct xrep_agfl ra;
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struct xfs_mount *mp = sc->mp;
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struct xfs_btree_cur *cur;
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struct xfs_bitmap_range *br;
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struct xfs_bitmap_range *n;
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int error;
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ra.sc = sc;
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ra.freesp = agfl_extents;
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xfs_bitmap_init(&ra.agmetablocks);
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/* Find all space used by the free space btrees & rmapbt. */
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cur = xfs_rmapbt_init_cursor(mp, sc->tp, agf_bp, sc->sa.agno);
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error = xfs_rmap_query_all(cur, xrep_agfl_walk_rmap, &ra);
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if (error)
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goto err;
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xfs_btree_del_cursor(cur, error);
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/* Find all blocks currently being used by the bnobt. */
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cur = xfs_allocbt_init_cursor(mp, sc->tp, agf_bp, sc->sa.agno,
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XFS_BTNUM_BNO);
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error = xfs_bitmap_set_btblocks(&ra.agmetablocks, cur);
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if (error)
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goto err;
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xfs_btree_del_cursor(cur, error);
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/* Find all blocks currently being used by the cntbt. */
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cur = xfs_allocbt_init_cursor(mp, sc->tp, agf_bp, sc->sa.agno,
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XFS_BTNUM_CNT);
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error = xfs_bitmap_set_btblocks(&ra.agmetablocks, cur);
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if (error)
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goto err;
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xfs_btree_del_cursor(cur, error);
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/*
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* Drop the freesp meta blocks that are in use by btrees.
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* The remaining blocks /should/ be AGFL blocks.
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*/
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error = xfs_bitmap_disunion(agfl_extents, &ra.agmetablocks);
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xfs_bitmap_destroy(&ra.agmetablocks);
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if (error)
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return error;
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/*
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* Calculate the new AGFL size. If we found more blocks than fit in
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* the AGFL we'll free them later.
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*/
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*flcount = 0;
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for_each_xfs_bitmap_extent(br, n, agfl_extents) {
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*flcount += br->len;
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if (*flcount > xfs_agfl_size(mp))
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break;
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}
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if (*flcount > xfs_agfl_size(mp))
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*flcount = xfs_agfl_size(mp);
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return 0;
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err:
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xfs_bitmap_destroy(&ra.agmetablocks);
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xfs_btree_del_cursor(cur, error);
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return error;
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}
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/* Update the AGF and reset the in-core state. */
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STATIC void
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xrep_agfl_update_agf(
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struct xfs_scrub *sc,
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struct xfs_buf *agf_bp,
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xfs_agblock_t flcount)
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{
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struct xfs_agf *agf = XFS_BUF_TO_AGF(agf_bp);
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ASSERT(flcount <= xfs_agfl_size(sc->mp));
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/* Trigger fdblocks recalculation */
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xfs_force_summary_recalc(sc->mp);
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/* Update the AGF counters. */
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if (sc->sa.pag->pagf_init)
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sc->sa.pag->pagf_flcount = flcount;
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agf->agf_flfirst = cpu_to_be32(0);
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agf->agf_flcount = cpu_to_be32(flcount);
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agf->agf_fllast = cpu_to_be32(flcount - 1);
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xfs_alloc_log_agf(sc->tp, agf_bp,
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XFS_AGF_FLFIRST | XFS_AGF_FLLAST | XFS_AGF_FLCOUNT);
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}
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/* Write out a totally new AGFL. */
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STATIC void
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xrep_agfl_init_header(
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struct xfs_scrub *sc,
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struct xfs_buf *agfl_bp,
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struct xfs_bitmap *agfl_extents,
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xfs_agblock_t flcount)
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{
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struct xfs_mount *mp = sc->mp;
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__be32 *agfl_bno;
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struct xfs_bitmap_range *br;
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struct xfs_bitmap_range *n;
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struct xfs_agfl *agfl;
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xfs_agblock_t agbno;
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unsigned int fl_off;
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ASSERT(flcount <= xfs_agfl_size(mp));
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/*
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* Start rewriting the header by setting the bno[] array to
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* NULLAGBLOCK, then setting AGFL header fields.
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*/
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agfl = XFS_BUF_TO_AGFL(agfl_bp);
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memset(agfl, 0xFF, BBTOB(agfl_bp->b_length));
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agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC);
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agfl->agfl_seqno = cpu_to_be32(sc->sa.agno);
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uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_meta_uuid);
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/*
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* Fill the AGFL with the remaining blocks. If agfl_extents has more
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* blocks than fit in the AGFL, they will be freed in a subsequent
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* step.
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*/
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fl_off = 0;
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agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, agfl_bp);
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for_each_xfs_bitmap_extent(br, n, agfl_extents) {
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agbno = XFS_FSB_TO_AGBNO(mp, br->start);
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trace_xrep_agfl_insert(mp, sc->sa.agno, agbno, br->len);
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while (br->len > 0 && fl_off < flcount) {
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agfl_bno[fl_off] = cpu_to_be32(agbno);
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fl_off++;
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agbno++;
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/*
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* We've now used br->start by putting it in the AGFL,
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* so bump br so that we don't reap the block later.
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*/
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br->start++;
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br->len--;
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}
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if (br->len)
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break;
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list_del(&br->list);
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kmem_free(br);
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}
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/* Write new AGFL to disk. */
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xfs_trans_buf_set_type(sc->tp, agfl_bp, XFS_BLFT_AGFL_BUF);
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xfs_trans_log_buf(sc->tp, agfl_bp, 0, BBTOB(agfl_bp->b_length) - 1);
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}
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/* Repair the AGFL. */
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int
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xrep_agfl(
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struct xfs_scrub *sc)
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{
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struct xfs_owner_info oinfo;
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struct xfs_bitmap agfl_extents;
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struct xfs_mount *mp = sc->mp;
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struct xfs_buf *agf_bp;
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struct xfs_buf *agfl_bp;
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xfs_agblock_t flcount;
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int error;
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/* We require the rmapbt to rebuild anything. */
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if (!xfs_sb_version_hasrmapbt(&mp->m_sb))
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return -EOPNOTSUPP;
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xchk_perag_get(sc->mp, &sc->sa);
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xfs_bitmap_init(&agfl_extents);
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/*
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* Read the AGF so that we can query the rmapbt. We hope that there's
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* nothing wrong with the AGF, but all the AG header repair functions
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* have this chicken-and-egg problem.
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*/
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error = xfs_alloc_read_agf(mp, sc->tp, sc->sa.agno, 0, &agf_bp);
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if (error)
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return error;
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if (!agf_bp)
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return -ENOMEM;
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/*
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* Make sure we have the AGFL buffer, as scrub might have decided it
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* was corrupt after xfs_alloc_read_agfl failed with -EFSCORRUPTED.
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*/
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error = xfs_trans_read_buf(mp, sc->tp, mp->m_ddev_targp,
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XFS_AG_DADDR(mp, sc->sa.agno, XFS_AGFL_DADDR(mp)),
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XFS_FSS_TO_BB(mp, 1), 0, &agfl_bp, NULL);
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if (error)
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return error;
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agfl_bp->b_ops = &xfs_agfl_buf_ops;
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/* Gather all the extents we're going to put on the new AGFL. */
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error = xrep_agfl_collect_blocks(sc, agf_bp, &agfl_extents, &flcount);
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if (error)
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goto err;
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/*
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* Update AGF and AGFL. We reset the global free block counter when
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* we adjust the AGF flcount (which can fail) so avoid updating any
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* buffers until we know that part works.
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*/
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xrep_agfl_update_agf(sc, agf_bp, flcount);
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xrep_agfl_init_header(sc, agfl_bp, &agfl_extents, flcount);
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/*
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* Ok, the AGFL should be ready to go now. Roll the transaction to
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* make the new AGFL permanent before we start using it to return
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* freespace overflow to the freespace btrees.
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*/
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sc->sa.agf_bp = agf_bp;
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sc->sa.agfl_bp = agfl_bp;
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error = xrep_roll_ag_trans(sc);
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if (error)
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goto err;
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/* Dump any AGFL overflow. */
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xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_AG);
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return xrep_reap_extents(sc, &agfl_extents, &oinfo, XFS_AG_RESV_AGFL);
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err:
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xfs_bitmap_destroy(&agfl_extents);
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return error;
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}
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@ -9,6 +9,7 @@
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#include "xfs_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_mount.h"
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#include "xfs_btree.h"
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#include "scrub/xfs_scrub.h"
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#include "scrub/scrub.h"
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#include "scrub/common.h"
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@ -209,3 +210,94 @@ out:
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}
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#undef LEFT_ALIGNED
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#undef RIGHT_ALIGNED
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/*
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* Record all btree blocks seen while iterating all records of a btree.
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*
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* We know that the btree query_all function starts at the left edge and walks
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* towards the right edge of the tree. Therefore, we know that we can walk up
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* the btree cursor towards the root; if the pointer for a given level points
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* to the first record/key in that block, we haven't seen this block before;
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* and therefore we need to remember that we saw this block in the btree.
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*
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* So if our btree is:
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*
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* 4
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* / | \
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* 1 2 3
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*
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* Pretend for this example that each leaf block has 100 btree records. For
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* the first btree record, we'll observe that bc_ptrs[0] == 1, so we record
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* that we saw block 1. Then we observe that bc_ptrs[1] == 1, so we record
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* block 4. The list is [1, 4].
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*
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* For the second btree record, we see that bc_ptrs[0] == 2, so we exit the
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* loop. The list remains [1, 4].
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*
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* For the 101st btree record, we've moved onto leaf block 2. Now
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* bc_ptrs[0] == 1 again, so we record that we saw block 2. We see that
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* bc_ptrs[1] == 2, so we exit the loop. The list is now [1, 4, 2].
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*
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* For the 102nd record, bc_ptrs[0] == 2, so we continue.
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*
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* For the 201st record, we've moved on to leaf block 3. bc_ptrs[0] == 1, so
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* we add 3 to the list. Now it is [1, 4, 2, 3].
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*
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* For the 300th record we just exit, with the list being [1, 4, 2, 3].
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*/
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/*
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* Record all the buffers pointed to by the btree cursor. Callers already
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* engaged in a btree walk should call this function to capture the list of
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* blocks going from the leaf towards the root.
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*/
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int
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xfs_bitmap_set_btcur_path(
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struct xfs_bitmap *bitmap,
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struct xfs_btree_cur *cur)
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{
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struct xfs_buf *bp;
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xfs_fsblock_t fsb;
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int i;
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int error;
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for (i = 0; i < cur->bc_nlevels && cur->bc_ptrs[i] == 1; i++) {
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xfs_btree_get_block(cur, i, &bp);
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if (!bp)
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continue;
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fsb = XFS_DADDR_TO_FSB(cur->bc_mp, bp->b_bn);
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error = xfs_bitmap_set(bitmap, fsb, 1);
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if (error)
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return error;
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}
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return 0;
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}
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/* Collect a btree's block in the bitmap. */
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STATIC int
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xfs_bitmap_collect_btblock(
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struct xfs_btree_cur *cur,
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int level,
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void *priv)
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{
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struct xfs_bitmap *bitmap = priv;
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struct xfs_buf *bp;
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xfs_fsblock_t fsbno;
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xfs_btree_get_block(cur, level, &bp);
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if (!bp)
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return 0;
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fsbno = XFS_DADDR_TO_FSB(cur->bc_mp, bp->b_bn);
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return xfs_bitmap_set(bitmap, fsbno, 1);
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}
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/* Walk the btree and mark the bitmap wherever a btree block is found. */
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int
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xfs_bitmap_set_btblocks(
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struct xfs_bitmap *bitmap,
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struct xfs_btree_cur *cur)
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{
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return xfs_btree_visit_blocks(cur, xfs_bitmap_collect_btblock, bitmap);
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}
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@ -28,5 +28,9 @@ void xfs_bitmap_destroy(struct xfs_bitmap *bitmap);
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int xfs_bitmap_set(struct xfs_bitmap *bitmap, uint64_t start, uint64_t len);
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int xfs_bitmap_disunion(struct xfs_bitmap *bitmap, struct xfs_bitmap *sub);
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int xfs_bitmap_set_btcur_path(struct xfs_bitmap *bitmap,
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struct xfs_btree_cur *cur);
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int xfs_bitmap_set_btblocks(struct xfs_bitmap *bitmap,
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struct xfs_btree_cur *cur);
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#endif /* __XFS_SCRUB_BITMAP_H__ */
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@ -59,6 +59,7 @@ int xrep_ino_dqattach(struct xfs_scrub *sc);
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int xrep_probe(struct xfs_scrub *sc);
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int xrep_superblock(struct xfs_scrub *sc);
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int xrep_agf(struct xfs_scrub *sc);
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int xrep_agfl(struct xfs_scrub *sc);
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#else
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@ -83,6 +84,7 @@ xrep_calc_ag_resblks(
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#define xrep_probe xrep_notsupported
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#define xrep_superblock xrep_notsupported
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#define xrep_agf xrep_notsupported
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#define xrep_agfl xrep_notsupported
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#endif /* CONFIG_XFS_ONLINE_REPAIR */
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@ -220,7 +220,7 @@ static const struct xchk_meta_ops meta_scrub_ops[] = {
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.type = ST_PERAG,
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.setup = xchk_setup_fs,
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.scrub = xchk_agfl,
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.repair = xrep_notsupported,
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.repair = xrep_agfl,
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},
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[XFS_SCRUB_TYPE_AGI] = { /* agi */
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.type = ST_PERAG,
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