From f62ac3e0ac33d366fe81e194fee81de9be2cd886 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Wed, 26 Oct 2022 14:16:36 -0700 Subject: xfs: check record domain when accessing refcount records Now that we've separated the startblock and CoW/shared extent domain in the incore refcount record structure, check the domain whenever we retrieve a record to ensure that it's still in the domain that we want. Depending on the circumstances, a change in domain either means we're done processing or that we've found a corruption and need to fail out. The refcount check in xchk_xref_is_cow_staging is redundant since _get_rec has done that for a long time now, so we can get rid of it. Signed-off-by: Darrick J. Wong Reviewed-by: Dave Chinner --- fs/xfs/libxfs/xfs_refcount.c | 53 ++++++++++++++++++++++++++++++++++---------- fs/xfs/scrub/refcount.c | 4 ++-- 2 files changed, 43 insertions(+), 14 deletions(-) (limited to 'fs') diff --git a/fs/xfs/libxfs/xfs_refcount.c b/fs/xfs/libxfs/xfs_refcount.c index ba2ddf177a49..27ed4c10d0d0 100644 --- a/fs/xfs/libxfs/xfs_refcount.c +++ b/fs/xfs/libxfs/xfs_refcount.c @@ -381,6 +381,8 @@ xfs_refcount_split_extent( error = -EFSCORRUPTED; goto out_error; } + if (rcext.rc_domain != domain) + return 0; if (rcext.rc_startblock == agbno || xfs_refc_next(&rcext) <= agbno) return 0; @@ -432,6 +434,9 @@ xfs_refcount_merge_center_extents( trace_xfs_refcount_merge_center_extents(cur->bc_mp, cur->bc_ag.pag->pag_agno, left, center, right); + ASSERT(left->rc_domain == center->rc_domain); + ASSERT(right->rc_domain == center->rc_domain); + /* * Make sure the center and right extents are not in the btree. * If the center extent was synthesized, the first delete call @@ -508,6 +513,8 @@ xfs_refcount_merge_left_extent( trace_xfs_refcount_merge_left_extent(cur->bc_mp, cur->bc_ag.pag->pag_agno, left, cleft); + ASSERT(left->rc_domain == cleft->rc_domain); + /* If the extent at agbno (cleft) wasn't synthesized, remove it. */ if (cleft->rc_refcount > 1) { error = xfs_refcount_lookup_le(cur, cleft->rc_domain, @@ -569,6 +576,8 @@ xfs_refcount_merge_right_extent( trace_xfs_refcount_merge_right_extent(cur->bc_mp, cur->bc_ag.pag->pag_agno, cright, right); + ASSERT(right->rc_domain == cright->rc_domain); + /* * If the extent ending at agbno+aglen (cright) wasn't synthesized, * remove it. @@ -649,11 +658,9 @@ xfs_refcount_find_left_extents( goto out_error; } - if (xfs_refc_next(&tmp) != agbno) - return 0; - if (domain == XFS_REFC_DOMAIN_SHARED && tmp.rc_refcount < 2) + if (tmp.rc_domain != domain) return 0; - if (domain == XFS_REFC_DOMAIN_COW && tmp.rc_refcount > 1) + if (xfs_refc_next(&tmp) != agbno) return 0; /* We have a left extent; retrieve (or invent) the next right one */ *left = tmp; @@ -670,6 +677,9 @@ xfs_refcount_find_left_extents( goto out_error; } + if (tmp.rc_domain != domain) + goto not_found; + /* if tmp starts at the end of our range, just use that */ if (tmp.rc_startblock == agbno) *cleft = tmp; @@ -689,6 +699,7 @@ xfs_refcount_find_left_extents( cleft->rc_domain = domain; } } else { +not_found: /* * No extents, so pretend that there's one covering the whole * range. @@ -740,11 +751,9 @@ xfs_refcount_find_right_extents( goto out_error; } - if (tmp.rc_startblock != agbno + aglen) - return 0; - if (domain == XFS_REFC_DOMAIN_SHARED && tmp.rc_refcount < 2) + if (tmp.rc_domain != domain) return 0; - if (domain == XFS_REFC_DOMAIN_COW && tmp.rc_refcount > 1) + if (tmp.rc_startblock != agbno + aglen) return 0; /* We have a right extent; retrieve (or invent) the next left one */ *right = tmp; @@ -761,6 +770,9 @@ xfs_refcount_find_right_extents( goto out_error; } + if (tmp.rc_domain != domain) + goto not_found; + /* if tmp ends at the end of our range, just use that */ if (xfs_refc_next(&tmp) == agbno + aglen) *cright = tmp; @@ -780,6 +792,7 @@ xfs_refcount_find_right_extents( cright->rc_domain = domain; } } else { +not_found: /* * No extents, so pretend that there's one covering the whole * range. @@ -889,7 +902,7 @@ xfs_refcount_merge_extents( aglen); } - return error; + return 0; } /* @@ -961,7 +974,7 @@ xfs_refcount_adjust_extents( error = xfs_refcount_get_rec(cur, &ext, &found_rec); if (error) goto out_error; - if (!found_rec) { + if (!found_rec || ext.rc_domain != XFS_REFC_DOMAIN_SHARED) { ext.rc_startblock = cur->bc_mp->m_sb.sb_agblocks; ext.rc_blockcount = 0; ext.rc_refcount = 0; @@ -1400,6 +1413,8 @@ xfs_refcount_find_shared( error = -EFSCORRUPTED; goto out_error; } + if (tmp.rc_domain != XFS_REFC_DOMAIN_SHARED) + goto done; /* If the extent ends before the start, look at the next one */ if (tmp.rc_startblock + tmp.rc_blockcount <= agbno) { @@ -1415,6 +1430,8 @@ xfs_refcount_find_shared( error = -EFSCORRUPTED; goto out_error; } + if (tmp.rc_domain != XFS_REFC_DOMAIN_SHARED) + goto done; } /* If the extent starts after the range we want, bail out */ @@ -1446,7 +1463,8 @@ xfs_refcount_find_shared( error = -EFSCORRUPTED; goto out_error; } - if (tmp.rc_startblock >= agbno + aglen || + if (tmp.rc_domain != XFS_REFC_DOMAIN_SHARED || + tmp.rc_startblock >= agbno + aglen || tmp.rc_startblock != *fbno + *flen) break; *flen = min(*flen + tmp.rc_blockcount, agbno + aglen - *fbno); @@ -1537,6 +1555,11 @@ xfs_refcount_adjust_cow_extents( error = xfs_refcount_get_rec(cur, &ext, &found_rec); if (error) goto out_error; + if (XFS_IS_CORRUPT(cur->bc_mp, found_rec && + ext.rc_domain != XFS_REFC_DOMAIN_COW)) { + error = -EFSCORRUPTED; + goto out_error; + } if (!found_rec) { ext.rc_startblock = cur->bc_mp->m_sb.sb_agblocks; ext.rc_blockcount = 0; @@ -1746,8 +1769,14 @@ xfs_refcount_recover_extent( rr = kmem_alloc(sizeof(struct xfs_refcount_recovery), 0); xfs_refcount_btrec_to_irec(rec, &rr->rr_rrec); - list_add_tail(&rr->rr_list, debris); + if (XFS_IS_CORRUPT(cur->bc_mp, + rr->rr_rrec.rc_domain != XFS_REFC_DOMAIN_COW)) { + kmem_free(rr); + return -EFSCORRUPTED; + } + + list_add_tail(&rr->rr_list, debris); return 0; } diff --git a/fs/xfs/scrub/refcount.c b/fs/xfs/scrub/refcount.c index fe5ffe4f478d..a26ee0f24ef2 100644 --- a/fs/xfs/scrub/refcount.c +++ b/fs/xfs/scrub/refcount.c @@ -439,8 +439,8 @@ xchk_xref_is_cow_staging( return; } - /* CoW flag must be set, refcount must be 1. */ - if (rc.rc_domain != XFS_REFC_DOMAIN_COW || rc.rc_refcount != 1) + /* CoW lookup returned a shared extent record? */ + if (rc.rc_domain != XFS_REFC_DOMAIN_COW) xchk_btree_xref_set_corrupt(sc, sc->sa.refc_cur, 0); /* Must be at least as long as what was passed in */ -- cgit v1.2.3