[Bug 215687] chown behavior on XFS is changed

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=215687

--- Comment #1 from Zorro Lang (zlang@redhat.com) ---
Oh, looks like the failures come from below testing:

expect 0 mkdir ${n0} 0755
expect 0 chown ${n0} 65534 65533
expect 0 chmod ${n0} 06555
expect 06555 lstat ${n0} mode
expect 0 -u 65534 -g 65533,65532 chown ${n0} 65534 65532
case "${os}:${fs}" in
Linux:glusterfs)
        expect "0555,65534,65532|06555,65534,65532" lstat ${n0} mode,uid,gid
        ;;
Linux:xfs)
        expect 0555,65534,65532 lstat ${n0} mode,uid,gid
        ;;
Linux:*)
        expect 06555,65534,65532 lstat ${n0} mode,uid,gid
        ;;
*)
        expect 0555,65534,65532 lstat ${n0} mode,uid,gid
        ;;
esac

If a directory has S_ISUID(04000) and S_ISGID(02000) permission bits, XFS will
lost these 2 bits after chown the group of the directory. But now it keeps
these two bits:

# mkdir dir
# chown 65534:65533 dir
# chmod 06555 dir
# ls -ld dir
dr-sr-sr-x. 2 nobody 65533 6 Mar 15 16:26 dir
# chown 65534:65532 dir
# ls -ld dir
dr-sr-sr-x. 2 nobody 65532 6 Mar 15 16:26 dir


Hmm... please help to make sure if this's an expected behavior change, or an
unexpected regression? Thanks.

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