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rdonly: Fixed lfs3_m_isrdonly shortcut leaving traversals dangling

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We were relying on the previous LFS3_TSTATE_OMDIRS logic implicitly
leaving t->ot NULL when it reaches the end of the linked-list. With the
lfs3_m_isrdonly shortcut we now need to do this explicitly.

Found by test_mount_flags

Adds a bit of code to both the default and rdonly builds, but a correct
filesystem is usually preferred over a small one:

                   code          stack          ctx
  rdonly before:  10676            840          524
  rdonly after:   10680 (+0.0%)    840 (+0.0%)  524 (+0.0%)

  default before: 37320           2280          636
  default after:  37324 (+0.0%)   2280 (+0.0%)  636 (+0.0%)
This commit is contained in:
Christopher Haster
2025-06-05 16:35:27 -05:00
parent 729d1c93a7
commit 9eaab640e6
1 changed files with 1 additions and 0 deletions
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lfs3.c
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@@ -9686,6 +9686,7 @@ static int lfs3_mtree_traverse_(lfs3_t *lfs3, lfs3_traversal_t *t,
// note we can skip checking opened files if mounted rdonly,
// this saves a bit of code when compiled rdonly
if (lfs3_m_isrdonly(lfs3->flags) || !t->ot) {
t->ot = NULL;
t->b.o.mdir.mid += 1;
lfs3_t_settstate(&t->b.o.flags, LFS3_TSTATE_MDIR);
continue;