From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
Regenerate the AGF from the rmap data.
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
fs/xfs/scrub/agheader_repair.c | 370 ++++++++++++++++++++++++++++++++++++++++
fs/xfs/scrub/repair.c | 27 ++-
fs/xfs/scrub/repair.h | 2
fs/xfs/scrub/scrub.c | 2
4 files changed, 391 insertions(+), 10 deletions(-)
diff --git a/fs/xfs/scrub/agheader_repair.c b/fs/xfs/scrub/agheader_repair.c
index 1e96621ece3a..4842fc598c9b 100644
--- a/fs/xfs/scrub/agheader_repair.c
+++ b/fs/xfs/scrub/agheader_repair.c
@@ -17,12 +17,19 @@
#include "xfs_sb.h"
#include "xfs_inode.h"
#include "xfs_alloc.h"
+#include "xfs_alloc_btree.h"
#include "xfs_ialloc.h"
+#include "xfs_ialloc_btree.h"
#include "xfs_rmap.h"
+#include "xfs_rmap_btree.h"
+#include "xfs_refcount.h"
+#include "xfs_refcount_btree.h"
#include "scrub/xfs_scrub.h"
#include "scrub/scrub.h"
#include "scrub/common.h"
#include "scrub/trace.h"
+#include "scrub/repair.h"
+#include "scrub/bitmap.h"
/* Superblock */
@@ -54,3 +61,366 @@ xrep_superblock(
xfs_trans_log_buf(sc->tp, bp, 0, BBTOB(bp->b_length) - 1);
return error;
}
+
+/* AGF */
+
+struct xrep_agf_allocbt {
+ struct xfs_scrub *sc;
+ xfs_agblock_t freeblks;
+ xfs_agblock_t longest;
+};
+
+/* Record free space shape information. */
+STATIC int
+xrep_agf_walk_allocbt(
+ struct xfs_btree_cur *cur,
+ struct xfs_alloc_rec_incore *rec,
+ void *priv)
+{
+ struct xrep_agf_allocbt *raa = priv;
+ int error = 0;
+
+ if (xchk_should_terminate(raa->sc, &error))
+ return error;
+
+ raa->freeblks += rec->ar_blockcount;
+ if (rec->ar_blockcount > raa->longest)
+ raa->longest = rec->ar_blockcount;
+ return error;
+}
+
+/* Does this AGFL block look sane? */
+STATIC int
+xrep_agf_check_agfl_block(
+ struct xfs_mount *mp,
+ xfs_agblock_t agbno,
+ void *priv)
+{
+ struct xfs_scrub *sc = priv;
+
+ if (!xfs_verify_agbno(mp, sc->sa.agno, agbno))
+ return -EFSCORRUPTED;
+ return 0;
+}
+
+/*
+ * Offset within the xrep_find_ag_btree array for each btree type. Avoid the
+ * XFS_BTNUM_ names here to avoid creating a sparse array.
+ */
+enum {
+ XREP_AGF_BNOBT = 0,
+ XREP_AGF_CNTBT,
+ XREP_AGF_RMAPBT,
+ XREP_AGF_REFCOUNTBT,
+ XREP_AGF_END,
+ XREP_AGF_MAX
+};
+
+/*
+ * Given the btree roots described by *fab, find the roots, check them for
+ * sanity, and pass the root data back out via *fab.
+ *
+ * This is /also/ a chicken and egg problem because we have to use the rmapbt
+ * (rooted in the AGF) to find the btrees rooted in the AGF. We also have no
+ * idea if the btrees make any sense. If we hit obvious corruptions in those
+ * btrees we'll bail out.
+ */
+STATIC int
+xrep_agf_find_btrees(
+ struct xfs_scrub *sc,
+ struct xfs_buf *agf_bp,
+ struct xrep_find_ag_btree *fab,
+ struct xfs_buf *agfl_bp)
+{
+ struct xfs_agf *old_agf = XFS_BUF_TO_AGF(agf_bp);
+ int error;
+
+ /* Go find the root data. */
+ error = xrep_find_ag_btree_roots(sc, agf_bp, fab, agfl_bp);
+ if (error)
+ return error;
+
+ /* We must find the bnobt, cntbt, and rmapbt roots. */
+ if (fab[XREP_AGF_BNOBT].root == NULLAGBLOCK ||
+ fab[XREP_AGF_BNOBT].height > XFS_BTREE_MAXLEVELS ||
+ fab[XREP_AGF_CNTBT].root == NULLAGBLOCK ||
+ fab[XREP_AGF_CNTBT].height > XFS_BTREE_MAXLEVELS ||
+ fab[XREP_AGF_RMAPBT].root == NULLAGBLOCK ||
+ fab[XREP_AGF_RMAPBT].height > XFS_BTREE_MAXLEVELS)
+ return -EFSCORRUPTED;
+
+ /*
+ * We relied on the rmapbt to reconstruct the AGF. If we get a
+ * different root then something's seriously wrong.
+ */
+ if (fab[XREP_AGF_RMAPBT].root !=
+ be32_to_cpu(old_agf->agf_roots[XFS_BTNUM_RMAPi]))
+ return -EFSCORRUPTED;
+
+ /* We must find the refcountbt root if that feature is enabled. */
+ if (xfs_sb_version_hasreflink(&sc->mp->m_sb) &&
+ (fab[XREP_AGF_REFCOUNTBT].root == NULLAGBLOCK ||
+ fab[XREP_AGF_REFCOUNTBT].height > XFS_BTREE_MAXLEVELS))
+ return -EFSCORRUPTED;
+
+ return 0;
+}
+
+/*
+ * Reinitialize the AGF header, making an in-core copy of the old contents so
+ * that we know which in-core state needs to be reinitialized.
+ */
+STATIC void
+xrep_agf_init_header(
+ struct xfs_scrub *sc,
+ struct xfs_buf *agf_bp,
+ struct xfs_agf *old_agf)
+{
+ struct xfs_mount *mp = sc->mp;
+ struct xfs_agf *agf = XFS_BUF_TO_AGF(agf_bp);
+
+ memcpy(old_agf, agf, sizeof(*old_agf));
+ memset(agf, 0, BBTOB(agf_bp->b_length));
+ agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
+ agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
+ agf->agf_seqno = cpu_to_be32(sc->sa.agno);
+ agf->agf_length = cpu_to_be32(xfs_ag_block_count(mp, sc->sa.agno));
+ agf->agf_flfirst = old_agf->agf_flfirst;
+ agf->agf_fllast = old_agf->agf_fllast;
+ agf->agf_flcount = old_agf->agf_flcount;
+ if (xfs_sb_version_hascrc(&mp->m_sb))
+ uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_meta_uuid);
+
+ /* Mark the incore AGF data stale until we're done fixing things. */
+ ASSERT(sc->sa.pag->pagf_init);
+ sc->sa.pag->pagf_init = 0;
+}
+
+/* Set btree root information in an AGF. */
+STATIC void
+xrep_agf_set_roots(
+ struct xfs_scrub *sc,
+ struct xfs_agf *agf,
+ struct xrep_find_ag_btree *fab)
+{
+ agf->agf_roots[XFS_BTNUM_BNOi] =
+ cpu_to_be32(fab[XREP_AGF_BNOBT].root);
+ agf->agf_levels[XFS_BTNUM_BNOi] =
+ cpu_to_be32(fab[XREP_AGF_BNOBT].height);
+
+ agf->agf_roots[XFS_BTNUM_CNTi] =
+ cpu_to_be32(fab[XREP_AGF_CNTBT].root);
+ agf->agf_levels[XFS_BTNUM_CNTi] =
+ cpu_to_be32(fab[XREP_AGF_CNTBT].height);
+
+ agf->agf_roots[XFS_BTNUM_RMAPi] =
+ cpu_to_be32(fab[XREP_AGF_RMAPBT].root);
+ agf->agf_levels[XFS_BTNUM_RMAPi] =
+ cpu_to_be32(fab[XREP_AGF_RMAPBT].height);
+
+ if (xfs_sb_version_hasreflink(&sc->mp->m_sb)) {
+ agf->agf_refcount_root =
+ cpu_to_be32(fab[XREP_AGF_REFCOUNTBT].root);
+ agf->agf_refcount_level =
+ cpu_to_be32(fab[XREP_AGF_REFCOUNTBT].height);
+ }
+}
+
+/* Update all AGF fields which derive from btree contents. */
+STATIC int
+xrep_agf_calc_from_btrees(
+ struct xfs_scrub *sc,
+ struct xfs_buf *agf_bp)
+{
+ struct xrep_agf_allocbt raa = { .sc = sc };
+ struct xfs_btree_cur *cur = NULL;
+ struct xfs_agf *agf = XFS_BUF_TO_AGF(agf_bp);
+ struct xfs_mount *mp = sc->mp;
+ xfs_agblock_t btreeblks;
+ xfs_agblock_t blocks;
+ int error;
+
+ /* Update the AGF counters from the bnobt. */
+ cur = xfs_allocbt_init_cursor(mp, sc->tp, agf_bp, sc->sa.agno,
+ XFS_BTNUM_BNO);
+ error = xfs_alloc_query_all(cur, xrep_agf_walk_allocbt, &raa);
+ if (error)
+ goto err;
+ error = xfs_btree_count_blocks(cur, &blocks);
+ if (error)
+ goto err;
+ xfs_btree_del_cursor(cur, error);
+ btreeblks = blocks - 1;
+ agf->agf_freeblks = cpu_to_be32(raa.freeblks);
+ agf->agf_longest = cpu_to_be32(raa.longest);
+
+ /* Update the AGF counters from the cntbt. */
+ cur = xfs_allocbt_init_cursor(mp, sc->tp, agf_bp, sc->sa.agno,
+ XFS_BTNUM_CNT);
+ error = xfs_btree_count_blocks(cur, &blocks);
+ if (error)
+ goto err;
+ xfs_btree_del_cursor(cur, error);
+ btreeblks += blocks - 1;
+
+ /* Update the AGF counters from the rmapbt. */
+ cur = xfs_rmapbt_init_cursor(mp, sc->tp, agf_bp, sc->sa.agno);
+ error = xfs_btree_count_blocks(cur, &blocks);
+ if (error)
+ goto err;
+ xfs_btree_del_cursor(cur, error);
+ agf->agf_rmap_blocks = cpu_to_be32(blocks);
+ btreeblks += blocks - 1;
+
+ agf->agf_btreeblks = cpu_to_be32(btreeblks);
+
+ /* Update the AGF counters from the refcountbt. */
+ if (xfs_sb_version_hasreflink(&mp->m_sb)) {
+ cur = xfs_refcountbt_init_cursor(mp, sc->tp, agf_bp,
+ sc->sa.agno);
+ error = xfs_btree_count_blocks(cur, &blocks);
+ if (error)
+ goto err;
+ xfs_btree_del_cursor(cur, error);
+ agf->agf_refcount_blocks = cpu_to_be32(blocks);
+ }
+
+ return 0;
+err:
+ xfs_btree_del_cursor(cur, error);
+ return error;
+}
+
+/* Commit the new AGF and reinitialize the incore state. */
+STATIC int
+xrep_agf_commit_new(
+ struct xfs_scrub *sc,
+ struct xfs_buf *agf_bp)
+{
+ struct xfs_perag *pag;
+ struct xfs_agf *agf = XFS_BUF_TO_AGF(agf_bp);
+
+ /* Trigger fdblocks recalculation */
+ xfs_force_summary_recalc(sc->mp);
+
+ /* Write this to disk. */
+ xfs_trans_buf_set_type(sc->tp, agf_bp, XFS_BLFT_AGF_BUF);
+ xfs_trans_log_buf(sc->tp, agf_bp, 0, BBTOB(agf_bp->b_length) - 1);
+
+ /* Now reinitialize the in-core counters we changed. */
+ pag = sc->sa.pag;
+ pag->pagf_btreeblks = be32_to_cpu(agf->agf_btreeblks);
+ pag->pagf_freeblks = be32_to_cpu(agf->agf_freeblks);
+ pag->pagf_longest = be32_to_cpu(agf->agf_longest);
+ pag->pagf_levels[XFS_BTNUM_BNOi] =
+ be32_to_cpu(agf->agf_levels[XFS_BTNUM_BNOi]);
+ pag->pagf_levels[XFS_BTNUM_CNTi] =
+ be32_to_cpu(agf->agf_levels[XFS_BTNUM_CNTi]);
+ pag->pagf_levels[XFS_BTNUM_RMAPi] =
+ be32_to_cpu(agf->agf_levels[XFS_BTNUM_RMAPi]);
+ pag->pagf_refcount_level = be32_to_cpu(agf->agf_refcount_level);
+ pag->pagf_init = 1;
+
+ return 0;
+}
+
+/* Repair the AGF. v5 filesystems only. */
+int
+xrep_agf(
+ struct xfs_scrub *sc)
+{
+ struct xrep_find_ag_btree fab[XREP_AGF_MAX] = {
+ [XREP_AGF_BNOBT] = {
+ .rmap_owner = XFS_RMAP_OWN_AG,
+ .buf_ops = &xfs_allocbt_buf_ops,
+ .magic = XFS_ABTB_CRC_MAGIC,
+ },
+ [XREP_AGF_CNTBT] = {
+ .rmap_owner = XFS_RMAP_OWN_AG,
+ .buf_ops = &xfs_allocbt_buf_ops,
+ .magic = XFS_ABTC_CRC_MAGIC,
+ },
+ [XREP_AGF_RMAPBT] = {
+ .rmap_owner = XFS_RMAP_OWN_AG,
+ .buf_ops = &xfs_rmapbt_buf_ops,
+ .magic = XFS_RMAP_CRC_MAGIC,
+ },
+ [XREP_AGF_REFCOUNTBT] = {
+ .rmap_owner = XFS_RMAP_OWN_REFC,
+ .buf_ops = &xfs_refcountbt_buf_ops,
+ .magic = XFS_REFC_CRC_MAGIC,
+ },
+ [XREP_AGF_END] = {
+ .buf_ops = NULL,
+ },
+ };
+ struct xfs_agf old_agf;
+ struct xfs_mount *mp = sc->mp;
+ struct xfs_buf *agf_bp;
+ struct xfs_buf *agfl_bp;
+ struct xfs_agf *agf;
+ int error;
+
+ /* We require the rmapbt to rebuild anything. */
+ if (!xfs_sb_version_hasrmapbt(&mp->m_sb))
+ return -EOPNOTSUPP;
+
+ xchk_perag_get(sc->mp, &sc->sa);
+ /*
+ * Make sure we have the AGF buffer, as scrub might have decided it
+ * was corrupt after xfs_alloc_read_agf failed with -EFSCORRUPTED.
+ */
+ error = xfs_trans_read_buf(mp, sc->tp, mp->m_ddev_targp,
+ XFS_AG_DADDR(mp, sc->sa.agno, XFS_AGF_DADDR(mp)),
+ XFS_FSS_TO_BB(mp, 1), 0, &agf_bp, NULL);
+ if (error)
+ return error;
+ agf_bp->b_ops = &xfs_agf_buf_ops;
+ agf = XFS_BUF_TO_AGF(agf_bp);
+
+ /*
+ * Load the AGFL so that we can screen out OWN_AG blocks that are on
+ * the AGFL now; these blocks might have once been part of the
+ * bno/cnt/rmap btrees but are not now. This is a chicken and egg
+ * problem: the AGF is corrupt, so we have to trust the AGFL contents
+ * because we can't do any serious cross-referencing with any of the
+ * btrees rooted in the AGF. If the AGFL contents are obviously bad
+ * then we'll bail out.
+ */
+ error = xfs_alloc_read_agfl(mp, sc->tp, sc->sa.agno, &agfl_bp);
+ if (error)
+ return error;
+
+ /*
+ * Spot-check the AGFL blocks; if they're obviously corrupt then
+ * there's nothing we can do but bail out.
+ */
+ error = xfs_agfl_walk(sc->mp, XFS_BUF_TO_AGF(agf_bp), agfl_bp,
+ xrep_agf_check_agfl_block, sc);
+ if (error)
+ return error;
+
+ /*
+ * Find the AGF btree roots. This is also a chicken-and-egg situation;
+ * see the function for more details.
+ */
+ error = xrep_agf_find_btrees(sc, agf_bp, fab, agfl_bp);
+ if (error)
+ return error;
+
+ /* Start rewriting the header and implant the btrees we found. */
+ xrep_agf_init_header(sc, agf_bp, &old_agf);
+ xrep_agf_set_roots(sc, agf, fab);
+ error = xrep_agf_calc_from_btrees(sc, agf_bp);
+ if (error)
+ goto out_revert;
+
+ /* Commit the changes and reinitialize incore state. */
+ return xrep_agf_commit_new(sc, agf_bp);
+
+out_revert:
+ /* Mark the incore AGF state stale and revert the AGF. */
+ sc->sa.pag->pagf_init = 0;
+ memcpy(agf, &old_agf, sizeof(old_agf));
+ return error;
+}
diff --git a/fs/xfs/scrub/repair.c b/fs/xfs/scrub/repair.c
index 6c199e2ebb81..183d9e84c7e5 100644
--- a/fs/xfs/scrub/repair.c
+++ b/fs/xfs/scrub/repair.c
@@ -128,9 +128,12 @@ xrep_roll_ag_trans(
int error;
/* Keep the AG header buffers locked so we can keep going. */
- xfs_trans_bhold(sc->tp, sc->sa.agi_bp);
- xfs_trans_bhold(sc->tp, sc->sa.agf_bp);
- xfs_trans_bhold(sc->tp, sc->sa.agfl_bp);
+ if (sc->sa.agi_bp)
+ xfs_trans_bhold(sc->tp, sc->sa.agi_bp);
+ if (sc->sa.agf_bp)
+ xfs_trans_bhold(sc->tp, sc->sa.agf_bp);
+ if (sc->sa.agfl_bp)
+ xfs_trans_bhold(sc->tp, sc->sa.agfl_bp);
/* Roll the transaction. */
error = xfs_trans_roll(&sc->tp);
@@ -138,9 +141,12 @@ xrep_roll_ag_trans(
goto out_release;
/* Join AG headers to the new transaction. */
- xfs_trans_bjoin(sc->tp, sc->sa.agi_bp);
- xfs_trans_bjoin(sc->tp, sc->sa.agf_bp);
- xfs_trans_bjoin(sc->tp, sc->sa.agfl_bp);
+ if (sc->sa.agi_bp)
+ xfs_trans_bjoin(sc->tp, sc->sa.agi_bp);
+ if (sc->sa.agf_bp)
+ xfs_trans_bjoin(sc->tp, sc->sa.agf_bp);
+ if (sc->sa.agfl_bp)
+ xfs_trans_bjoin(sc->tp, sc->sa.agfl_bp);
return 0;
@@ -150,9 +156,12 @@ xrep_roll_ag_trans(
* buffers will be released during teardown on our way out
* of the kernel.
*/
- xfs_trans_bhold_release(sc->tp, sc->sa.agi_bp);
- xfs_trans_bhold_release(sc->tp, sc->sa.agf_bp);
- xfs_trans_bhold_release(sc->tp, sc->sa.agfl_bp);
+ if (sc->sa.agi_bp)
+ xfs_trans_bhold_release(sc->tp, sc->sa.agi_bp);
+ if (sc->sa.agf_bp)
+ xfs_trans_bhold_release(sc->tp, sc->sa.agf_bp);
+ if (sc->sa.agfl_bp)
+ xfs_trans_bhold_release(sc->tp, sc->sa.agfl_bp);
return error;
}
diff --git a/fs/xfs/scrub/repair.h b/fs/xfs/scrub/repair.h
index 5a4e92221916..6f0903c51a47 100644
--- a/fs/xfs/scrub/repair.h
+++ b/fs/xfs/scrub/repair.h
@@ -58,6 +58,7 @@ int xrep_ino_dqattach(struct xfs_scrub *sc);
int xrep_probe(struct xfs_scrub *sc);
int xrep_superblock(struct xfs_scrub *sc);
+int xrep_agf(struct xfs_scrub *sc);
#else
@@ -81,6 +82,7 @@ xrep_calc_ag_resblks(
#define xrep_probe xrep_notsupported
#define xrep_superblock xrep_notsupported
+#define xrep_agf xrep_notsupported
#endif /* CONFIG_XFS_ONLINE_REPAIR */
diff --git a/fs/xfs/scrub/scrub.c b/fs/xfs/scrub/scrub.c
index 6efb926f3cf8..1e8a17c8e2b9 100644
--- a/fs/xfs/scrub/scrub.c
+++ b/fs/xfs/scrub/scrub.c
@@ -214,7 +214,7 @@ static const struct xchk_meta_ops meta_scrub_ops[] = {
.type = ST_PERAG,
.setup = xchk_setup_fs,
.scrub = xchk_agf,
- .repair = xrep_notsupported,
+ .repair = xrep_agf,
},
[XFS_SCRUB_TYPE_AGFL]= { /* agfl */
.type = ST_PERAG,
--
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