On 6/20/19 11:50 AM, Darrick J. Wong wrote:
> From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
>
> Validate that the start and end of the log stay within a single AG if
> we adjust either end to align to stripe units.
>
> Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
Reviewed-by: Eric Sandeen <sandeen@xxxxxxxxxx>
> ---
> mkfs/xfs_mkfs.c | 15 ++++++++++++++-
> 1 file changed, 14 insertions(+), 1 deletion(-)
>
>
> diff --git a/mkfs/xfs_mkfs.c b/mkfs/xfs_mkfs.c
> index ddb25ecc..468b8fde 100644
> --- a/mkfs/xfs_mkfs.c
> +++ b/mkfs/xfs_mkfs.c
> @@ -3033,15 +3033,28 @@ align_internal_log(
> struct xfs_mount *mp,
> int sunit)
> {
> + uint64_t logend;
> +
> /* round up log start if necessary */
> if ((cfg->logstart % sunit) != 0)
> cfg->logstart = ((cfg->logstart + (sunit - 1)) / sunit) * sunit;
>
> + /* If our log start overlaps the next AG's metadata, fail. */
> + if (!xfs_verify_fsbno(mp, cfg->logstart)) {
> + fprintf(stderr,
> +_("Due to stripe alignment, the internal log start (%lld) cannot be aligned\n"
> + "within an allocation group.\n"),
> + (long long) cfg->logstart);
> + usage();
> + }
> +
> /* round up/down the log size now */
> align_log_size(cfg, sunit);
>
> /* check the aligned log still fits in an AG. */
> - if (cfg->logblocks > cfg->agsize - XFS_FSB_TO_AGBNO(mp, cfg->logstart)) {
> + logend = cfg->logstart + cfg->logblocks - 1;
> + if (XFS_FSB_TO_AGNO(mp, cfg->logstart) != XFS_FSB_TO_AGNO(mp, logend) ||
> + !xfs_verify_fsbno(mp, logend)) {
> fprintf(stderr,
> _("Due to stripe alignment, the internal log size (%lld) is too large.\n"
> "Must fit within an allocation group.\n"),
>
