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-rw-r--r--fs/xfs/scrub/agheader_repair.c889
1 files changed, 883 insertions, 6 deletions
diff --git a/fs/xfs/scrub/agheader_repair.c b/fs/xfs/scrub/agheader_repair.c
index 117eedac53df..f7568a4b5fe5 100644
--- a/fs/xfs/scrub/agheader_repair.c
+++ b/fs/xfs/scrub/agheader_repair.c
@@ -17,24 +17,31 @@
#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 */
/* Repair the superblock. */
int
-xfs_repair_superblock(
- struct xfs_scrub_context *sc)
+xrep_superblock(
+ struct xfs_scrub *sc)
{
- struct xfs_mount *mp = sc->mp;
- struct xfs_buf *bp;
- xfs_agnumber_t agno;
- int error;
+ struct xfs_mount *mp = sc->mp;
+ struct xfs_buf *bp;
+ xfs_agnumber_t agno;
+ int error;
/* Don't try to repair AG 0's sb; let xfs_repair deal with it. */
agno = sc->sm->sm_agno;
@@ -54,3 +61,873 @@ xfs_repair_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
+};
+
+/* Check a btree root candidate. */
+static inline bool
+xrep_check_btree_root(
+ struct xfs_scrub *sc,
+ struct xrep_find_ag_btree *fab)
+{
+ struct xfs_mount *mp = sc->mp;
+ xfs_agnumber_t agno = sc->sm->sm_agno;
+
+ return xfs_verify_agbno(mp, agno, fab->root) &&
+ fab->height <= XFS_BTREE_MAXLEVELS;
+}
+
+/*
+ * 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 (!xrep_check_btree_root(sc, &fab[XREP_AGF_BNOBT]) ||
+ !xrep_check_btree_root(sc, &fab[XREP_AGF_CNTBT]) ||
+ !xrep_check_btree_root(sc, &fab[XREP_AGF_RMAPBT]))
+ 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) &&
+ !xrep_check_btree_root(sc, &fab[XREP_AGF_REFCOUNTBT]))
+ 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;
+}
+
+/* AGFL */
+
+struct xrep_agfl {
+ /* Bitmap of other OWN_AG metadata blocks. */
+ struct xfs_bitmap agmetablocks;
+
+ /* Bitmap of free space. */
+ struct xfs_bitmap *freesp;
+
+ struct xfs_scrub *sc;
+};
+
+/* Record all OWN_AG (free space btree) information from the rmap data. */
+STATIC int
+xrep_agfl_walk_rmap(
+ struct xfs_btree_cur *cur,
+ struct xfs_rmap_irec *rec,
+ void *priv)
+{
+ struct xrep_agfl *ra = priv;
+ xfs_fsblock_t fsb;
+ int error = 0;
+
+ if (xchk_should_terminate(ra->sc, &error))
+ return error;
+
+ /* Record all the OWN_AG blocks. */
+ if (rec->rm_owner == XFS_RMAP_OWN_AG) {
+ fsb = XFS_AGB_TO_FSB(cur->bc_mp, cur->bc_private.a.agno,
+ rec->rm_startblock);
+ error = xfs_bitmap_set(ra->freesp, fsb, rec->rm_blockcount);
+ if (error)
+ return error;
+ }
+
+ return xfs_bitmap_set_btcur_path(&ra->agmetablocks, cur);
+}
+
+/*
+ * Map out all the non-AGFL OWN_AG space in this AG so that we can deduce
+ * which blocks belong to the AGFL.
+ *
+ * Compute the set of old AGFL blocks by subtracting from the list of OWN_AG
+ * blocks the list of blocks owned by all other OWN_AG metadata (bnobt, cntbt,
+ * rmapbt). These are the old AGFL blocks, so return that list and the number
+ * of blocks we're actually going to put back on the AGFL.
+ */
+STATIC int
+xrep_agfl_collect_blocks(
+ struct xfs_scrub *sc,
+ struct xfs_buf *agf_bp,
+ struct xfs_bitmap *agfl_extents,
+ xfs_agblock_t *flcount)
+{
+ struct xrep_agfl ra;
+ struct xfs_mount *mp = sc->mp;
+ struct xfs_btree_cur *cur;
+ struct xfs_bitmap_range *br;
+ struct xfs_bitmap_range *n;
+ int error;
+
+ ra.sc = sc;
+ ra.freesp = agfl_extents;
+ xfs_bitmap_init(&ra.agmetablocks);
+
+ /* Find all space used by the free space btrees & rmapbt. */
+ cur = xfs_rmapbt_init_cursor(mp, sc->tp, agf_bp, sc->sa.agno);
+ error = xfs_rmap_query_all(cur, xrep_agfl_walk_rmap, &ra);
+ if (error)
+ goto err;
+ xfs_btree_del_cursor(cur, error);
+
+ /* Find all blocks currently being used by the bnobt. */
+ cur = xfs_allocbt_init_cursor(mp, sc->tp, agf_bp, sc->sa.agno,
+ XFS_BTNUM_BNO);
+ error = xfs_bitmap_set_btblocks(&ra.agmetablocks, cur);
+ if (error)
+ goto err;
+ xfs_btree_del_cursor(cur, error);
+
+ /* Find all blocks currently being used by the cntbt. */
+ cur = xfs_allocbt_init_cursor(mp, sc->tp, agf_bp, sc->sa.agno,
+ XFS_BTNUM_CNT);
+ error = xfs_bitmap_set_btblocks(&ra.agmetablocks, cur);
+ if (error)
+ goto err;
+
+ xfs_btree_del_cursor(cur, error);
+
+ /*
+ * Drop the freesp meta blocks that are in use by btrees.
+ * The remaining blocks /should/ be AGFL blocks.
+ */
+ error = xfs_bitmap_disunion(agfl_extents, &ra.agmetablocks);
+ xfs_bitmap_destroy(&ra.agmetablocks);
+ if (error)
+ return error;
+
+ /*
+ * Calculate the new AGFL size. If we found more blocks than fit in
+ * the AGFL we'll free them later.
+ */
+ *flcount = 0;
+ for_each_xfs_bitmap_extent(br, n, agfl_extents) {
+ *flcount += br->len;
+ if (*flcount > xfs_agfl_size(mp))
+ break;
+ }
+ if (*flcount > xfs_agfl_size(mp))
+ *flcount = xfs_agfl_size(mp);
+ return 0;
+
+err:
+ xfs_bitmap_destroy(&ra.agmetablocks);
+ xfs_btree_del_cursor(cur, error);
+ return error;
+}
+
+/* Update the AGF and reset the in-core state. */
+STATIC void
+xrep_agfl_update_agf(
+ struct xfs_scrub *sc,
+ struct xfs_buf *agf_bp,
+ xfs_agblock_t flcount)
+{
+ struct xfs_agf *agf = XFS_BUF_TO_AGF(agf_bp);
+
+ ASSERT(flcount <= xfs_agfl_size(sc->mp));
+
+ /* Trigger fdblocks recalculation */
+ xfs_force_summary_recalc(sc->mp);
+
+ /* Update the AGF counters. */
+ if (sc->sa.pag->pagf_init)
+ sc->sa.pag->pagf_flcount = flcount;
+ agf->agf_flfirst = cpu_to_be32(0);
+ agf->agf_flcount = cpu_to_be32(flcount);
+ agf->agf_fllast = cpu_to_be32(flcount - 1);
+
+ xfs_alloc_log_agf(sc->tp, agf_bp,
+ XFS_AGF_FLFIRST | XFS_AGF_FLLAST | XFS_AGF_FLCOUNT);
+}
+
+/* Write out a totally new AGFL. */
+STATIC void
+xrep_agfl_init_header(
+ struct xfs_scrub *sc,
+ struct xfs_buf *agfl_bp,
+ struct xfs_bitmap *agfl_extents,
+ xfs_agblock_t flcount)
+{
+ struct xfs_mount *mp = sc->mp;
+ __be32 *agfl_bno;
+ struct xfs_bitmap_range *br;
+ struct xfs_bitmap_range *n;
+ struct xfs_agfl *agfl;
+ xfs_agblock_t agbno;
+ unsigned int fl_off;
+
+ ASSERT(flcount <= xfs_agfl_size(mp));
+
+ /*
+ * Start rewriting the header by setting the bno[] array to
+ * NULLAGBLOCK, then setting AGFL header fields.
+ */
+ agfl = XFS_BUF_TO_AGFL(agfl_bp);
+ memset(agfl, 0xFF, BBTOB(agfl_bp->b_length));
+ agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC);
+ agfl->agfl_seqno = cpu_to_be32(sc->sa.agno);
+ uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_meta_uuid);
+
+ /*
+ * Fill the AGFL with the remaining blocks. If agfl_extents has more
+ * blocks than fit in the AGFL, they will be freed in a subsequent
+ * step.
+ */
+ fl_off = 0;
+ agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, agfl_bp);
+ for_each_xfs_bitmap_extent(br, n, agfl_extents) {
+ agbno = XFS_FSB_TO_AGBNO(mp, br->start);
+
+ trace_xrep_agfl_insert(mp, sc->sa.agno, agbno, br->len);
+
+ while (br->len > 0 && fl_off < flcount) {
+ agfl_bno[fl_off] = cpu_to_be32(agbno);
+ fl_off++;
+ agbno++;
+
+ /*
+ * We've now used br->start by putting it in the AGFL,
+ * so bump br so that we don't reap the block later.
+ */
+ br->start++;
+ br->len--;
+ }
+
+ if (br->len)
+ break;
+ list_del(&br->list);
+ kmem_free(br);
+ }
+
+ /* Write new AGFL to disk. */
+ xfs_trans_buf_set_type(sc->tp, agfl_bp, XFS_BLFT_AGFL_BUF);
+ xfs_trans_log_buf(sc->tp, agfl_bp, 0, BBTOB(agfl_bp->b_length) - 1);
+}
+
+/* Repair the AGFL. */
+int
+xrep_agfl(
+ struct xfs_scrub *sc)
+{
+ struct xfs_owner_info oinfo;
+ struct xfs_bitmap agfl_extents;
+ struct xfs_mount *mp = sc->mp;
+ struct xfs_buf *agf_bp;
+ struct xfs_buf *agfl_bp;
+ xfs_agblock_t flcount;
+ 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);
+ xfs_bitmap_init(&agfl_extents);
+
+ /*
+ * Read the AGF so that we can query the rmapbt. We hope that there's
+ * nothing wrong with the AGF, but all the AG header repair functions
+ * have this chicken-and-egg problem.
+ */
+ error = xfs_alloc_read_agf(mp, sc->tp, sc->sa.agno, 0, &agf_bp);
+ if (error)
+ return error;
+ if (!agf_bp)
+ return -ENOMEM;
+
+ /*
+ * Make sure we have the AGFL buffer, as scrub might have decided it
+ * was corrupt after xfs_alloc_read_agfl failed with -EFSCORRUPTED.
+ */
+ error = xfs_trans_read_buf(mp, sc->tp, mp->m_ddev_targp,
+ XFS_AG_DADDR(mp, sc->sa.agno, XFS_AGFL_DADDR(mp)),
+ XFS_FSS_TO_BB(mp, 1), 0, &agfl_bp, NULL);
+ if (error)
+ return error;
+ agfl_bp->b_ops = &xfs_agfl_buf_ops;
+
+ /* Gather all the extents we're going to put on the new AGFL. */
+ error = xrep_agfl_collect_blocks(sc, agf_bp, &agfl_extents, &flcount);
+ if (error)
+ goto err;
+
+ /*
+ * Update AGF and AGFL. We reset the global free block counter when
+ * we adjust the AGF flcount (which can fail) so avoid updating any
+ * buffers until we know that part works.
+ */
+ xrep_agfl_update_agf(sc, agf_bp, flcount);
+ xrep_agfl_init_header(sc, agfl_bp, &agfl_extents, flcount);
+
+ /*
+ * Ok, the AGFL should be ready to go now. Roll the transaction to
+ * make the new AGFL permanent before we start using it to return
+ * freespace overflow to the freespace btrees.
+ */
+ sc->sa.agf_bp = agf_bp;
+ sc->sa.agfl_bp = agfl_bp;
+ error = xrep_roll_ag_trans(sc);
+ if (error)
+ goto err;
+
+ /* Dump any AGFL overflow. */
+ xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_AG);
+ return xrep_reap_extents(sc, &agfl_extents, &oinfo, XFS_AG_RESV_AGFL);
+err:
+ xfs_bitmap_destroy(&agfl_extents);
+ return error;
+}
+
+/* AGI */
+
+/*
+ * 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_AGI_INOBT = 0,
+ XREP_AGI_FINOBT,
+ XREP_AGI_END,
+ XREP_AGI_MAX
+};
+
+/*
+ * Given the inode btree roots described by *fab, find the roots, check them
+ * for sanity, and pass the root data back out via *fab.
+ */
+STATIC int
+xrep_agi_find_btrees(
+ struct xfs_scrub *sc,
+ struct xrep_find_ag_btree *fab)
+{
+ struct xfs_buf *agf_bp;
+ struct xfs_mount *mp = sc->mp;
+ int error;
+
+ /* Read the AGF. */
+ error = xfs_alloc_read_agf(mp, sc->tp, sc->sa.agno, 0, &agf_bp);
+ if (error)
+ return error;
+ if (!agf_bp)
+ return -ENOMEM;
+
+ /* Find the btree roots. */
+ error = xrep_find_ag_btree_roots(sc, agf_bp, fab, NULL);
+ if (error)
+ return error;
+
+ /* We must find the inobt root. */
+ if (!xrep_check_btree_root(sc, &fab[XREP_AGI_INOBT]))
+ return -EFSCORRUPTED;
+
+ /* We must find the finobt root if that feature is enabled. */
+ if (xfs_sb_version_hasfinobt(&mp->m_sb) &&
+ !xrep_check_btree_root(sc, &fab[XREP_AGI_FINOBT]))
+ return -EFSCORRUPTED;
+
+ return 0;
+}
+
+/*
+ * Reinitialize the AGI 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_agi_init_header(
+ struct xfs_scrub *sc,
+ struct xfs_buf *agi_bp,
+ struct xfs_agi *old_agi)
+{
+ struct xfs_agi *agi = XFS_BUF_TO_AGI(agi_bp);
+ struct xfs_mount *mp = sc->mp;
+
+ memcpy(old_agi, agi, sizeof(*old_agi));
+ memset(agi, 0, BBTOB(agi_bp->b_length));
+ agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
+ agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
+ agi->agi_seqno = cpu_to_be32(sc->sa.agno);
+ agi->agi_length = cpu_to_be32(xfs_ag_block_count(mp, sc->sa.agno));
+ agi->agi_newino = cpu_to_be32(NULLAGINO);
+ agi->agi_dirino = cpu_to_be32(NULLAGINO);
+ if (xfs_sb_version_hascrc(&mp->m_sb))
+ uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_meta_uuid);
+
+ /* We don't know how to fix the unlinked list yet. */
+ memcpy(&agi->agi_unlinked, &old_agi->agi_unlinked,
+ sizeof(agi->agi_unlinked));
+
+ /* Mark the incore AGF data stale until we're done fixing things. */
+ ASSERT(sc->sa.pag->pagi_init);
+ sc->sa.pag->pagi_init = 0;
+}
+
+/* Set btree root information in an AGI. */
+STATIC void
+xrep_agi_set_roots(
+ struct xfs_scrub *sc,
+ struct xfs_agi *agi,
+ struct xrep_find_ag_btree *fab)
+{
+ agi->agi_root = cpu_to_be32(fab[XREP_AGI_INOBT].root);
+ agi->agi_level = cpu_to_be32(fab[XREP_AGI_INOBT].height);
+
+ if (xfs_sb_version_hasfinobt(&sc->mp->m_sb)) {
+ agi->agi_free_root = cpu_to_be32(fab[XREP_AGI_FINOBT].root);
+ agi->agi_free_level = cpu_to_be32(fab[XREP_AGI_FINOBT].height);
+ }
+}
+
+/* Update the AGI counters. */
+STATIC int
+xrep_agi_calc_from_btrees(
+ struct xfs_scrub *sc,
+ struct xfs_buf *agi_bp)
+{
+ struct xfs_btree_cur *cur;
+ struct xfs_agi *agi = XFS_BUF_TO_AGI(agi_bp);
+ struct xfs_mount *mp = sc->mp;
+ xfs_agino_t count;
+ xfs_agino_t freecount;
+ int error;
+
+ cur = xfs_inobt_init_cursor(mp, sc->tp, agi_bp, sc->sa.agno,
+ XFS_BTNUM_INO);
+ error = xfs_ialloc_count_inodes(cur, &count, &freecount);
+ if (error)
+ goto err;
+ xfs_btree_del_cursor(cur, error);
+
+ agi->agi_count = cpu_to_be32(count);
+ agi->agi_freecount = cpu_to_be32(freecount);
+ return 0;
+err:
+ xfs_btree_del_cursor(cur, error);
+ return error;
+}
+
+/* Trigger reinitialization of the in-core data. */
+STATIC int
+xrep_agi_commit_new(
+ struct xfs_scrub *sc,
+ struct xfs_buf *agi_bp)
+{
+ struct xfs_perag *pag;
+ struct xfs_agi *agi = XFS_BUF_TO_AGI(agi_bp);
+
+ /* Trigger inode count recalculation */
+ xfs_force_summary_recalc(sc->mp);
+
+ /* Write this to disk. */
+ xfs_trans_buf_set_type(sc->tp, agi_bp, XFS_BLFT_AGI_BUF);
+ xfs_trans_log_buf(sc->tp, agi_bp, 0, BBTOB(agi_bp->b_length) - 1);
+
+ /* Now reinitialize the in-core counters if necessary. */
+ pag = sc->sa.pag;
+ pag->pagi_count = be32_to_cpu(agi->agi_count);
+ pag->pagi_freecount = be32_to_cpu(agi->agi_freecount);
+ pag->pagi_init = 1;
+
+ return 0;
+}
+
+/* Repair the AGI. */
+int
+xrep_agi(
+ struct xfs_scrub *sc)
+{
+ struct xrep_find_ag_btree fab[XREP_AGI_MAX] = {
+ [XREP_AGI_INOBT] = {
+ .rmap_owner = XFS_RMAP_OWN_INOBT,
+ .buf_ops = &xfs_inobt_buf_ops,
+ .magic = XFS_IBT_CRC_MAGIC,
+ },
+ [XREP_AGI_FINOBT] = {
+ .rmap_owner = XFS_RMAP_OWN_INOBT,
+ .buf_ops = &xfs_inobt_buf_ops,
+ .magic = XFS_FIBT_CRC_MAGIC,
+ },
+ [XREP_AGI_END] = {
+ .buf_ops = NULL
+ },
+ };
+ struct xfs_agi old_agi;
+ struct xfs_mount *mp = sc->mp;
+ struct xfs_buf *agi_bp;
+ struct xfs_agi *agi;
+ 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 AGI buffer, as scrub might have decided it
+ * was corrupt after xfs_ialloc_read_agi failed with -EFSCORRUPTED.
+ */
+ error = xfs_trans_read_buf(mp, sc->tp, mp->m_ddev_targp,
+ XFS_AG_DADDR(mp, sc->sa.agno, XFS_AGI_DADDR(mp)),
+ XFS_FSS_TO_BB(mp, 1), 0, &agi_bp, NULL);
+ if (error)
+ return error;
+ agi_bp->b_ops = &xfs_agi_buf_ops;
+ agi = XFS_BUF_TO_AGI(agi_bp);
+
+ /* Find the AGI btree roots. */
+ error = xrep_agi_find_btrees(sc, fab);
+ if (error)
+ return error;
+
+ /* Start rewriting the header and implant the btrees we found. */
+ xrep_agi_init_header(sc, agi_bp, &old_agi);
+ xrep_agi_set_roots(sc, agi, fab);
+ error = xrep_agi_calc_from_btrees(sc, agi_bp);
+ if (error)
+ goto out_revert;
+
+ /* Reinitialize in-core state. */
+ return xrep_agi_commit_new(sc, agi_bp);
+
+out_revert:
+ /* Mark the incore AGI state stale and revert the AGI. */
+ sc->sa.pag->pagi_init = 0;
+ memcpy(agi, &old_agi, sizeof(old_agi));
+ return error;
+}