+
+ if (en_l < l_ptrs.end || en_r < r_ptrs.end)
+ return false;
+
+ en_l = l_ptrs.start;
+ en_r = r_ptrs.start;
+ lp.crc = bch2_extent_crc_unpack(l.k, NULL);
+ rp.crc = bch2_extent_crc_unpack(r.k, NULL);
+
+ while (__bkey_ptr_next_decode(l.k, l_ptrs.end, lp, en_l) &&
+ __bkey_ptr_next_decode(r.k, r_ptrs.end, rp, en_r)) {
+ if (lp.ptr.offset + lp.crc.offset + lp.crc.live_size !=
+ rp.ptr.offset + rp.crc.offset ||
+ lp.ptr.dev != rp.ptr.dev ||
+ lp.ptr.gen != rp.ptr.gen ||
+ lp.ptr.unwritten != rp.ptr.unwritten ||
+ lp.has_ec != rp.has_ec)
+ return false;
+
+ /* Extents may not straddle buckets: */
+ ca = bch_dev_bkey_exists(c, lp.ptr.dev);
+ if (PTR_BUCKET_NR(ca, &lp.ptr) != PTR_BUCKET_NR(ca, &rp.ptr))
+ return false;
+
+ if (lp.has_ec != rp.has_ec ||
+ (lp.has_ec &&
+ (lp.ec.block != rp.ec.block ||
+ lp.ec.redundancy != rp.ec.redundancy ||
+ lp.ec.idx != rp.ec.idx)))
+ return false;
+
+ if (lp.crc.compression_type != rp.crc.compression_type ||
+ lp.crc.nonce != rp.crc.nonce)
+ return false;
+
+ if (lp.crc.offset + lp.crc.live_size + rp.crc.live_size <=
+ lp.crc.uncompressed_size) {
+ /* can use left extent's crc entry */
+ } else if (lp.crc.live_size <= rp.crc.offset) {
+ /* can use right extent's crc entry */
+ } else {
+ /* check if checksums can be merged: */
+ if (lp.crc.csum_type != rp.crc.csum_type ||
+ lp.crc.nonce != rp.crc.nonce ||
+ crc_is_compressed(lp.crc) ||
+ !bch2_checksum_mergeable(lp.crc.csum_type))
+ return false;
+
+ if (lp.crc.offset + lp.crc.live_size != lp.crc.compressed_size ||
+ rp.crc.offset)
+ return false;
+
+ if (lp.crc.csum_type &&
+ lp.crc.uncompressed_size +
+ rp.crc.uncompressed_size > (c->opts.encoded_extent_max >> 9))
+ return false;
+ }
+
+ en_l = extent_entry_next(en_l);
+ en_r = extent_entry_next(en_r);