anchao opened a new pull request, #21029:
URL: https://github.com/apache/nuttx/pull/21029
## Summary
Add a fast path to inode search setup for simple absolute paths that are
already in canonical form.
For common paths such as `/dev/ttyS0`, `/proc/meminfo`, or `/tmp/a`,
`inode_search_setup()` no longer allocates a `PATH_MAX` temporary buffer,
copies the path into it, and canonicalizes it back to the same string.
Instead, when the path needs no root prefixing or normalization, inode
search can use the caller-provided path directly.
The existing mutable-buffer path is still used for cases that may require
path expansion or canonicalization, including relative paths, chroot root
prefixing, `.` / `..` segments, duplicate slashes, trailing slashes, and
`nofollow` lookups.
## Benefits
- Reduces temporary buffer usage on common VFS inode lookups.
- Avoids unnecessary path copying and canonicalization for already-simple
absolute paths.
- Lowers pressure on the libc tempbuffer pool and avoids possible heap
fallback when the pool is exhausted.
- Preserves existing behavior for non-canonical, chroot, relative, and
symbolic-link-sensitive lookup paths.
## Testing
sim/nsh
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