en Copyright 2015 Java http://172.16.0.5:8080/history/linux-6.15/tools/testing/selftests/fchmodat2/.gitignore#4859c257 selftests: Add fchmodat2 selftestThe test marks as skipped if a syscall with the AT_SYMLINK_NOFOLLOW flagfails. This is because not all filesystems support changing the modebits of symlinks properly. These filesystems return an error but changethe mode bits:newfstatat(4, "regfile", {st_mode=S_IFREG|0640, st_size=0, ...}, AT_SYMLINK_NOFOLLOW) = 0newfstatat(4, "symlink", {st_mode=S_IFLNK|0777, st_size=7, ...}, AT_SYMLINK_NOFOLLOW) = 0syscall_0x1c3(0x4, 0x55fa1f244396, 0x180, 0x100, 0x55fa1f24438e, 0x34) = -1 EOPNOTSUPP (Operation not supported)newfstatat(4, "regfile", {st_mode=S_IFREG|0640, st_size=0, ...}, AT_SYMLINK_NOFOLLOW) = 0This happens with btrfs and xfs: $ tools/testing/selftests/fchmodat2/fchmodat2_test TAP version 13 1..1 ok 1 # SKIP fchmodat2(symlink) # Totals: pass:0 fail:0 xfail:0 xpass:0 skip:1 error:0 $ stat /tmp/ksft-fchmodat2.*/symlink File: /tmp/ksft-fchmodat2.3NCqlE/symlink -> regfile Size: 7 Blocks: 0 IO Block: 4096 symbolic link Device: 7,0 Inode: 133 Links: 1 Access: (0600/lrw-------) Uid: ( 0/ root) Gid: ( 0/ root)Signed-off-by: Alexey Gladkov <legion@kernel.org>Message-Id: <4532a04a870ff589ba62ceeacf76f0bd81b9ba01.1689092120.git.legion@kernel.org>Signed-off-by: Christian Brauner <brauner@kernel.org> List of files: /linux-6.15/tools/testing/selftests/fchmodat2/.gitignore Tue, 11 Jul 2023 16:16:07 +0000 Alexey Gladkov <legion@kernel.org>