Daan De Meyer
05a4f7755a
On 32-bit userspace running against a 64-bit kernel BTRFS_IOC_GET_SUBVOL_INFO returns -ENOTTY: struct btrfs_ioctl_get_subvol_info_args embeds four btrfs_ioctl_timespec values, and that timespec struct (__u64 sec; __u32 nsec) packs to 12 bytes on i386 but 16 on x86_64 due to differing __u64 alignment. sizeof(struct) is part of the ioctl cmd number via _IOR(), so the cmd emitted by 32-bit userspace doesn't match the case label compiled by the 64-bit kernel and the switch falls through to -ENOTTY. btrfs already handles this exact class of bug for BTRFS_IOC_SET_RECEIVED_SUBVOL via a btrfs_ioctl_timespec_32 struct plus a _32 cmd alias in fs/btrfs/ioctl.c, but GET_SUBVOL_INFO (added in 2018, four years after that fix) didn't get the same treatment. Until a kernel patch lands the test can't exercise the ioctl on 32-bit, so convert TEST(info) to TEST_RET(info) and return EXIT_TEST_SKIP with a clear message when -ENOTTY comes back. The other tests in the file use ioctls that already have working compat paths and remain unaffected.
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