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Recycle mdir rbyd in mtree lookups

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A bit of a hack, but this saves some stack:

           code          stack          ctx
  before: 35764           2392          640
  after:  35768 (+0.0%)   2368 (-1.0%)  640 (+0.0%)

It's not like the rbyd is doing anything else until we fetch the mdir.
This commit is contained in:
Christopher Haster
2025-04-29 00:01:32 -05:00
parent dc2d58d28e
commit e6f28e202e
1 changed files with 4 additions and 6 deletions
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lfs.c
+4 -6
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@@ -7678,13 +7678,12 @@ static int lfsr_mtree_lookup(lfs_t *lfs, lfsr_smid_t mid,
// look up mdir in actual mtree
} else {
lfsr_bid_t bid;
lfsr_rbyd_t rbyd;
lfsr_srid_t rid;
lfsr_tag_t tag;
lfsr_bid_t weight;
lfsr_data_t data;
int err = lfsr_btree_lookupleaf(lfs, &lfs->mtree, mid,
&bid, &rbyd, &rid, &tag, &weight, &data);
&bid, &mdir->rbyd, &rid, &tag, &weight, &data);
if (err) {
LFS_ASSERT(err != LFS_ERR_NOENT);
return err;
@@ -7696,7 +7695,7 @@ static int lfsr_mtree_lookup(lfs_t *lfs, lfsr_smid_t mid,
// if we found an mname, lookup the mdir
if (tag == LFSR_TAG_MNAME) {
err = lfsr_rbyd_lookup(lfs, &rbyd, rid, LFSR_TAG_MDIR,
err = lfsr_rbyd_lookup(lfs, &mdir->rbyd, rid, LFSR_TAG_MDIR,
NULL, &data);
if (err) {
LFS_ASSERT(err != LFS_ERR_NOENT);
@@ -9172,14 +9171,13 @@ static int lfsr_mtree_namelookup(lfs_t *lfs,
// lookup name in actual mtree
} else {
lfsr_bid_t bid;
lfsr_rbyd_t rbyd;
lfsr_srid_t rid;
lfsr_tag_t tag;
lfsr_bid_t weight;
lfsr_data_t data;
lfs_scmp_t cmp = lfsr_btree_namelookupleaf(lfs, &lfs->mtree,
did, name, name_len,
&bid, &rbyd, &rid, &tag, &weight, &data);
&bid, &mdir->rbyd, &rid, &tag, &weight, &data);
if (cmp < 0) {
LFS_ASSERT(cmp != LFS_ERR_NOENT);
return cmp;
@@ -9190,7 +9188,7 @@ static int lfsr_mtree_namelookup(lfs_t *lfs,
// if we found an mname, lookup the mdir
if (tag == LFSR_TAG_MNAME) {
int err = lfsr_rbyd_lookup(lfs, &rbyd, rid, LFSR_TAG_MDIR,
int err = lfsr_rbyd_lookup(lfs, &mdir->rbyd, rid, LFSR_TAG_MDIR,
NULL, &data);
if (err) {
LFS_ASSERT(err != LFS_ERR_NOENT);