xiaoxiang781216 opened a new pull request, #19179:
URL: https://github.com/apache/nuttx/pull/19179
## Summary
This series widens NuttX's inode/uid integer types and adds the POSIX
`d_ino` member to `struct dirent`, so portable software (e.g. dropbear's
`scp`) that relies on a meaningful, wide file serial number works correctly.
* **sys/types: always use unsigned int for uid_t/gid_t** — move
`uid_t`/`gid_t` out of the `CONFIG_SMALL_MEMORY` `#ifdef` so they are
always `unsigned int`; keep `include/nuttx/fs/hostfs.h` in sync (drop the
`int16_t` variants of `nuttx_gid_t`/`nuttx_uid_t`).
* **fs: widen ino_t from uint16_t to uint32_t** — a 16-bit `ino_t` only
addresses 65536 file serial numbers, which breaks large directory trees
and portable callers. Widen `ino_t` (and `nuttx_ino_t` in the hostfs ABI)
to `uint32_t`. Adjust `fs/rpmsgfs/rpmsgfs.h` so the packed
`rpmsgfs_stat_priv_s` layout/size stays unchanged.
* **fs/dir: reuse close_mountpoint/close_pseudodir helpers in dir_close** —
`dir_close()` open-coded the same cleanup that `closedir()` already does
via the helpers; share the logic so future fixes live in one place.
* **fs/dirent: add d_ino member to struct dirent** — declare `d_ino` and
populate it on every `readdir()` path (pseudofs, hostfs/sim, yaffs,
rpmsgfs), so callers observe a non-zero inode number.
## Impact
* Adds the POSIX `d_ino` field to `struct dirent` (was previously absent).
* `ino_t` widened from 16-bit to 32-bit; `uid_t`/`gid_t` are now always
`unsigned int` regardless of `CONFIG_SMALL_MEMORY`.
* hostfs RPC ABI (`struct nuttx_dirent_s`, `nuttx_ino_t`,
`nuttx_uid_t`/`nuttx_gid_t`) updated to match; rpmsgfs packed struct size
preserved.
* No new configuration options; no defconfig changes.
## Testing
* `tools/checkpatch.sh -g apache/master..HEAD` — all checks pass.
* Built and ran `sim:nsh`; verified `readdir()`/`ls` reports non-zero
`d_ino` values and hostfs/rpmsgfs paths propagate the inode number.
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