[PATCH 2/5] xfs_db: check should deal with cow staging events correctly
From: Darrick J. Wong <hidden>
Date: 2018-01-03 18:40:22
Subsystem:
the rest · Maintainer:
Linus Torvalds
From: Darrick J. Wong <redacted> Teach xfs_check to record cow staging events correctly. This means that we strip off the high bit before using startblock. Signed-off-by: Darrick J. Wong <redacted> --- db/check.c | 19 +++++++++++++++---- 1 file changed, 15 insertions(+), 4 deletions(-)
diff --git a/db/check.c b/db/check.c
index 3afde02..2f8dee5 100644
--- a/db/check.c
+++ b/db/check.c@@ -4730,13 +4730,24 @@ scanfunc_refcnt( lastblock = 0; for (i = 0; i < be16_to_cpu(block->bb_numrecs); i++) { if (be32_to_cpu(rp[i].rc_refcount) == 1) { - dbprintf(_( - "leftover CoW extent (%u/%u) len %u\n"), + xfs_agblock_t agbno; + char *msg; + + agbno = be32_to_cpu(rp[i].rc_startblock); + if (agbno >= XFS_REFC_COW_START) { + agbno -= XFS_REFC_COW_START; + msg = _( + "leftover CoW extent (%u/%u) len %u\n"); + } else { + msg = _( + "leftover CoW extent at unexpected address (%u/%u) len %u\n"); + } + dbprintf(msg, seqno, - be32_to_cpu(rp[i].rc_startblock), + agbno, be32_to_cpu(rp[i].rc_blockcount)); set_dbmap(seqno, - be32_to_cpu(rp[i].rc_startblock), + agbno, be32_to_cpu(rp[i].rc_blockcount), DBM_COWDATA, seqno, bno); } else {