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Reverted some root-related errors to EXIST/ISDIR

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Changed:

- lfsr_mkdir(&lfs, "/") => LFS_ERR_EXIST
- lfsr_file_open(&lfs, &file, "/", *) => LFS_ERR_ISDIR

Unchanged:

- lfsr_remove(&lfs, "/") => LFS_ERR_INVAL
- lfsr_rename(&lfs, "/", *) => LFS_ERR_INVAL
- lfsr_rename(&lfs, *, "/") => LFS_ERR_INVAL

This better matches what Linux, etc, does: prefering a normal
dir-related error unless the only issue is that the dir in question is
the root.

Though Linux, etc, usually return EBUSY, which seems to also be used for
special device files. We could add LFS_ERR_BUSY, but I'm not sure it's
really worth it for such a rare error. It's not like the name would help
anything...

Internally, lfsr_mtree_pathlookup always returns LFS_ERR_INVAL for root,
so this unfortunately requires a bit more code to map to the correct
errors:

           code          stack
  before: 33598           2592
  after   33634 (+0.1%)   2592 (+0.0%)
This commit is contained in:
Christopher Haster
2024-06-08 13:55:29 -05:00
parent b2e5a13525
commit ab46cb0bbd
4 changed files with 12 additions and 12 deletions
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tests/test_dirs.toml
+2 -2
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@@ -283,14 +283,14 @@ code = '''
}
// try to make root, which doesn't make sense
lfsr_mkdir(&lfs, "/") => LFS_ERR_INVAL;
lfsr_mkdir(&lfs, "/") => LFS_ERR_EXIST;
// make a directory
err = lfsr_mkdir(&lfs, "ardvark");
assert(!err || (TEST_PLS && err == LFS_ERR_EXIST));
// try to make root, which doesn't make sense
lfsr_mkdir(&lfs, "/") => LFS_ERR_INVAL;
lfsr_mkdir(&lfs, "/") => LFS_ERR_EXIST;
for (int remount = 0; remount < 2; remount++) {
// remount?