Spot-check the reflink btree for obvious errors.
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
repair/scan.c | 181 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 181 insertions(+)
diff --git a/repair/scan.c b/repair/scan.c
index afb57f3..1661753 100644
--- a/repair/scan.c
+++ b/repair/scan.c
@@ -1018,6 +1018,174 @@ _("unknown block (%d,%d-%d) mismatch on %s tree, state - %d,%" PRIx64 "\n"),
}
}
+static void
+scan_rlbt(
+ struct xfs_btree_block *block,
+ int level,
+ xfs_agblock_t bno,
+ xfs_agnumber_t agno,
+ int suspect,
+ int isroot,
+ __uint32_t magic,
+ void *priv)
+{
+ struct aghdr_cnts *agcnts = priv;
+ const char *name = "rl";
+ int i;
+ xfs_reflink_ptr_t *pp;
+ struct xfs_reflink_rec *rp;
+ int hdr_errors = 0;
+ int numrecs;
+ int state;
+ xfs_agblock_t lastblock = 0;
+
+ if (magic != XFS_RLBT_CRC_MAGIC) {
+ name = "(unknown)";
+ assert(0);
+ }
+
+ if (be32_to_cpu(block->bb_magic) != magic) {
+ do_warn(_("bad magic # %#x in bt%s block %d/%d\n"),
+ be32_to_cpu(block->bb_magic), name, agno, bno);
+ hdr_errors++;
+ if (suspect)
+ return;
+ }
+
+ /*
+ * All reflink btree blocks except the roots are freed for a
+ * fully empty filesystem, thus they are counted towards the
+ * free data block counter.
+ */
+ if (!isroot) {
+ agcnts->agfbtreeblks++;
+ agcnts->fdblocks++;
+ }
+
+ if (be16_to_cpu(block->bb_level) != level) {
+ do_warn(_("expected level %d got %d in bt%s block %d/%d\n"),
+ level, be16_to_cpu(block->bb_level), name, agno, bno);
+ hdr_errors++;
+ if (suspect)
+ return;
+ }
+
+ /* check for btree blocks multiply claimed */
+ state = get_bmap(agno, bno);
+ if (!(state == XR_E_UNKNOWN || state == XR_E_FS_MAP1)) {
+ set_bmap(agno, bno, XR_E_MULT);
+ do_warn(
+_("%s reflink btree block claimed (state %d), agno %d, bno %d, suspect %d\n"),
+ name, state, agno, bno, suspect);
+ return;
+ }
+ set_bmap(agno, bno, XR_E_FS_MAP);
+
+ numrecs = be16_to_cpu(block->bb_numrecs);
+ if (level == 0) {
+ if (numrecs > mp->m_rlbt_mxr[0]) {
+ numrecs = mp->m_rlbt_mxr[0];
+ hdr_errors++;
+ }
+ if (isroot == 0 && numrecs < mp->m_rlbt_mnr[0]) {
+ numrecs = mp->m_rlbt_mnr[0];
+ hdr_errors++;
+ }
+
+ if (hdr_errors) {
+ do_warn(
+ _("bad btree nrecs (%u, min=%u, max=%u) in bt%s block %u/%u\n"),
+ be16_to_cpu(block->bb_numrecs),
+ mp->m_rlbt_mnr[0], mp->m_rlbt_mxr[0],
+ name, agno, bno);
+ suspect++;
+ }
+
+ rp = XFS_REFLINK_REC_ADDR(block, 1);
+ for (i = 0; i < numrecs; i++) {
+ xfs_agblock_t b, end;
+ xfs_extlen_t len;
+ xfs_nlink_t nr;
+
+ b = be32_to_cpu(rp[i].rr_startblock);
+ len = be32_to_cpu(rp[i].rr_blockcount);
+ nr = be32_to_cpu(rp[i].rr_nlinks);
+ end = b + len;
+
+ if (!verify_agbno(mp, agno, b)) {
+ do_warn(
+ _("invalid start block %u in record %u of %s btree block %u/%u\n"),
+ b, i, name, agno, bno);
+ continue;
+ }
+ if (len == 0 || !verify_agbno(mp, agno, end - 1)) {
+ do_warn(
+ _("invalid length %u in record %u of %s btree block %u/%u\n"),
+ len, i, name, agno, bno);
+ continue;
+ }
+
+ if (nr < 2 || nr > MAXRLCOUNT) {
+ do_warn(
+ _("invalid reference count %u in record %u of %s btree block %u/%u\n"),
+ nr, i, name, agno, bno);
+ continue;
+ }
+
+ if (b && b <= lastblock) {
+ do_warn(_(
+ "out-of-order %s btree record %d (%u %u) block %u/%u\n"),
+ name, i, b, len, agno, bno);
+ } else {
+ lastblock = b;
+ }
+
+ /* XXX: probably want to mark the reflinked areas? */
+ }
+ return;
+ }
+
+ /*
+ * interior record
+ */
+ pp = XFS_REFLINK_PTR_ADDR(block, 1, mp->m_rmap_mxr[1]);
+
+ if (numrecs > mp->m_rlbt_mxr[1]) {
+ numrecs = mp->m_rlbt_mxr[1];
+ hdr_errors++;
+ }
+ if (isroot == 0 && numrecs < mp->m_rlbt_mnr[1]) {
+ numrecs = mp->m_rlbt_mnr[1];
+ hdr_errors++;
+ }
+
+ /*
+ * don't pass bogus tree flag down further if this block
+ * looked ok. bail out if two levels in a row look bad.
+ */
+ if (hdr_errors) {
+ do_warn(
+ _("bad btree nrecs (%u, min=%u, max=%u) in bt%s block %u/%u\n"),
+ be16_to_cpu(block->bb_numrecs),
+ mp->m_rlbt_mnr[1], mp->m_rlbt_mxr[1],
+ name, agno, bno);
+ if (suspect)
+ return;
+ suspect++;
+ } else if (suspect) {
+ suspect = 0;
+ }
+
+ for (i = 0; i < numrecs; i++) {
+ xfs_agblock_t bno = be32_to_cpu(pp[i]);
+
+ if (bno != 0 && verify_agbno(mp, agno, bno)) {
+ scan_sbtree(bno, level, agno, suspect, scan_rlbt, 0,
+ magic, priv, &xfs_reflinkbt_buf_ops);
+ }
+ }
+}
+
static int
scan_single_ino_chunk(
xfs_agnumber_t agno,
@@ -1803,6 +1971,19 @@ validate_agf(
}
}
+ if (xfs_sb_version_hasreflink(&mp->m_sb)) {
+ bno = be32_to_cpu(agf->agf_reflink_root);
+ if (bno != 0 && verify_agbno(mp, agno, bno)) {
+ scan_sbtree(bno,
+ be32_to_cpu(agf->agf_reflink_level),
+ agno, 0, scan_rlbt, 1, XFS_RLBT_CRC_MAGIC,
+ agcnts, &xfs_reflinkbt_buf_ops);
+ } else {
+ do_warn(_("bad agbno %u for rlbt root, agno %d\n"),
+ bno, agno);
+ }
+ }
+
if (be32_to_cpu(agf->agf_freeblks) != agcnts->agffreeblks) {
do_warn(_("agf_freeblks %u, counted %u in ag %u\n"),
be32_to_cpu(agf->agf_freeblks), agcnts->agffreeblks, agno);
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