[jdk21u-dev] RFR: 8337966: (fs) Files.readAttributes fails with Operation not permitted on older docker releases [v3]

[Alexey Bakhtin]

> … on older docker releases
> 
> Please review the fix for regression on the old Docker versions (before v18.04).
> 
> [JDK-8316304](https://bugs.openjdk.org/browse/JDK-8316304) was backported to JDK21, requiring statx syscall support.
> In the old Docker versions, the default seccomp profile does not allow statx syscall and fails with EPERM error code.
> Suggest fixing this issue by fallback to alternative implementation at runtime if syscall is not allowed.
> 
> The same issue with copy_file_range syscall.
> 
> The fix was initially submitted against upstream jdk ( https://github.com/openjdk/jdk/pull/20484 ) but after discussion submitted to JDK21

Alexey Bakhtin has updated the pull request incrementally with one additional commit since the last revision:

  added comments

-------------

Changes:
  - all: https://git.openjdk.org/jdk21u-dev/pull/951/files
  - new: https://git.openjdk.org/jdk21u-dev/pull/951/files/74acb11f..515fd7dd

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=951&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=951&range=01-02

  Stats: 8 lines in 1 file changed: 8 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/951.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/951/head:pull/951

PR: https://git.openjdk.org/jdk21u-dev/pull/951