os: `ReadDir` fails on file systems without File ID support on Windows [1.21 backport]

[gopherbot]

@bcmills requested issue #61907 to be considered for backport to the next 1.21 minor release.

@gopherbot, please backport to Go 1.21. This is a significant regression in ReadDir.

[gopherbot]

Change https://go.dev/cl/518196 mentions this issue: os: support file systems without file IDs when reading directories on windows

[dmitshur]

This is a significant regression in ReadDir.

@bcmills Can you please provide a more detailed rationale for this backport? Thanks.

[dmitshur]

@aclements suggests a possible alternative path of reverting the optimization (if viable) and then applying the stronger fix for Go 1.22 only.

[gopherbot]

Change https://go.dev/cl/520156 mentions this issue: [release-branch.go1.21] Revert "os: use handle based APIs to read directories on windows"

[bcmills]

Can you please provide a more detailed rationale for this backport? Thanks.

Without some kind of backport fix, calling Readdir or ReadDir fails for an os.File representing a directory in certain filesystems (notably SMB shares). That breaks a number of tools, including cmd/go in some cases (see the original report in #61907).

[bcmills]

@aclements Suggests a possible alternative path of reverting the optimization (if viable)

It looks like it is feasible to revert: https://go.dev/cl/520156 required a couple of non-trivial merge resolutions but overall seems to apply fairly cleanly.