From: Darrick J. Wong <djwong@xxxxxxxxxx> Source kernel commit: 9099cd38002f8029c9a1da08e6832d1cd18e8451 Reconstruct the refcount data from the rmap btree. Link: https://docs.kernel.org/filesystems/xfs-online-fsck-design.html#case-study-rebuilding-the-space-reference-counts Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx> Reviewed-by: Dave Chinner <dchinner@xxxxxxxxxx> Reviewed-by: Christoph Hellwig <hch@xxxxxx> Reviewed-by: Bill O'Donnell <bodonnel@xxxxxxxxxx> --- libxfs/xfs_ag.h | 1 + libxfs/xfs_btree.c | 26 ++++++++++++++++++++++++++ libxfs/xfs_btree.h | 2 ++ libxfs/xfs_refcount.c | 8 +++----- libxfs/xfs_refcount.h | 2 +- libxfs/xfs_refcount_btree.c | 13 ++++++++++++- 6 files changed, 45 insertions(+), 7 deletions(-) diff --git a/libxfs/xfs_ag.h b/libxfs/xfs_ag.h index f16cb7a17..67c3260ee 100644 --- a/libxfs/xfs_ag.h +++ b/libxfs/xfs_ag.h @@ -87,6 +87,7 @@ struct xfs_perag { * verifiers while rebuilding the AG btrees. */ uint8_t pagf_repair_levels[XFS_BTNUM_AGF]; + uint8_t pagf_repair_refcount_level; #endif spinlock_t pag_state_lock; diff --git a/libxfs/xfs_btree.c b/libxfs/xfs_btree.c index 97962fc16..0022bb641 100644 --- a/libxfs/xfs_btree.c +++ b/libxfs/xfs_btree.c @@ -5209,3 +5209,29 @@ xfs_btree_destroy_cur_caches(void) xfs_rmapbt_destroy_cur_cache(); xfs_refcountbt_destroy_cur_cache(); } + +/* Move the btree cursor before the first record. */ +int +xfs_btree_goto_left_edge( + struct xfs_btree_cur *cur) +{ + int stat = 0; + int error; + + memset(&cur->bc_rec, 0, sizeof(cur->bc_rec)); + error = xfs_btree_lookup(cur, XFS_LOOKUP_LE, &stat); + if (error) + return error; + if (!stat) + return 0; + + error = xfs_btree_decrement(cur, 0, &stat); + if (error) + return error; + if (stat != 0) { + ASSERT(0); + return -EFSCORRUPTED; + } + + return 0; +} diff --git a/libxfs/xfs_btree.h b/libxfs/xfs_btree.h index e0875cec4..d906324e2 100644 --- a/libxfs/xfs_btree.h +++ b/libxfs/xfs_btree.h @@ -738,4 +738,6 @@ xfs_btree_alloc_cursor( int __init xfs_btree_init_cur_caches(void); void xfs_btree_destroy_cur_caches(void); +int xfs_btree_goto_left_edge(struct xfs_btree_cur *cur); + #endif /* __XFS_BTREE_H__ */ diff --git a/libxfs/xfs_refcount.c b/libxfs/xfs_refcount.c index 45f8134e4..3377fac12 100644 --- a/libxfs/xfs_refcount.c +++ b/libxfs/xfs_refcount.c @@ -122,11 +122,9 @@ xfs_refcount_btrec_to_irec( /* Simple checks for refcount records. */ xfs_failaddr_t xfs_refcount_check_irec( - struct xfs_btree_cur *cur, + struct xfs_perag *pag, const struct xfs_refcount_irec *irec) { - struct xfs_perag *pag = cur->bc_ag.pag; - if (irec->rc_blockcount == 0 || irec->rc_blockcount > MAXREFCEXTLEN) return __this_address; @@ -178,7 +176,7 @@ xfs_refcount_get_rec( return error; xfs_refcount_btrec_to_irec(rec, irec); - fa = xfs_refcount_check_irec(cur, irec); + fa = xfs_refcount_check_irec(cur->bc_ag.pag, irec); if (fa) return xfs_refcount_complain_bad_rec(cur, fa, irec); @@ -1898,7 +1896,7 @@ xfs_refcount_recover_extent( INIT_LIST_HEAD(&rr->rr_list); xfs_refcount_btrec_to_irec(rec, &rr->rr_rrec); - if (xfs_refcount_check_irec(cur, &rr->rr_rrec) != NULL || + if (xfs_refcount_check_irec(cur->bc_ag.pag, &rr->rr_rrec) != NULL || XFS_IS_CORRUPT(cur->bc_mp, rr->rr_rrec.rc_domain != XFS_REFC_DOMAIN_COW)) { kfree(rr); diff --git a/libxfs/xfs_refcount.h b/libxfs/xfs_refcount.h index 783cd89ca..5c207f1c6 100644 --- a/libxfs/xfs_refcount.h +++ b/libxfs/xfs_refcount.h @@ -117,7 +117,7 @@ extern int xfs_refcount_has_records(struct xfs_btree_cur *cur, union xfs_btree_rec; extern void xfs_refcount_btrec_to_irec(const union xfs_btree_rec *rec, struct xfs_refcount_irec *irec); -xfs_failaddr_t xfs_refcount_check_irec(struct xfs_btree_cur *cur, +xfs_failaddr_t xfs_refcount_check_irec(struct xfs_perag *pag, const struct xfs_refcount_irec *irec); extern int xfs_refcount_insert(struct xfs_btree_cur *cur, struct xfs_refcount_irec *irec, int *stat); diff --git a/libxfs/xfs_refcount_btree.c b/libxfs/xfs_refcount_btree.c index bc8bd867e..ac1c3ab86 100644 --- a/libxfs/xfs_refcount_btree.c +++ b/libxfs/xfs_refcount_btree.c @@ -225,7 +225,18 @@ xfs_refcountbt_verify( level = be16_to_cpu(block->bb_level); if (pag && xfs_perag_initialised_agf(pag)) { - if (level >= pag->pagf_refcount_level) + unsigned int maxlevel = pag->pagf_refcount_level; + +#ifdef CONFIG_XFS_ONLINE_REPAIR + /* + * Online repair could be rewriting the refcount btree, so + * we'll validate against the larger of either tree while this + * is going on. + */ + maxlevel = max_t(unsigned int, maxlevel, + pag->pagf_repair_refcount_level); +#endif + if (level >= maxlevel) return __this_address; } else if (level >= mp->m_refc_maxlevels) return __this_address;
