mkfs: stop allowing tiny filesystems
Refuse to format a filesystem that are "too small", because these
configurations are known to have performance and redundancy problems
that are not present on the volume sizes that XFS is best at handling.
Specifically, this means that we won't allow logs smaller than 64MB, we
won't allow single-AG filesystems, and we won't allow volumes smaller
than 300MB. There are two exceptions: the first is an undocumented CLI
option that can be used for crafting debug filesystems.
The second exception is that if fstests is detected, because there are a
lot of fstests that use tiny filesystems to perform targeted regression
and functional testing in a controlled environment. Fixing the ~40 or
so tests to run more slowly with larger filesystems isn't worth the risk
of breaking the tests.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
2 files changed
