From 77e9ce327d9b607cd6e57c0f4524a654dc59c4b1 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Sat, 17 Jun 2017 15:44:06 -0400 Subject: ufs: fix the logics for tail relocation * original hysteresis loop got broken by typo back in 2002; now it never switches out of OPTTIME state. Fixed. * critical levels for switching from OPTTIME to OPTSPACE and back ought to be calculated once, at mount time. * we should use mul_u64_u32_div() for those calculations, now that ->s_dsize is 64bit. * to quote Kirk McKusick (in 1995 FreeBSD commit message): The threshold for switching from time-space and space-time is too small when minfree is 5%...so make it stay at space in this case. Signed-off-by: Al Viro --- fs/ufs/super.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'fs/ufs/super.c') diff --git a/fs/ufs/super.c b/fs/ufs/super.c index 34656c7a8e22..f211b662dd92 100644 --- a/fs/ufs/super.c +++ b/fs/ufs/super.c @@ -1211,6 +1211,15 @@ magic_found: uspi->s_root_blocks = mul_u64_u32_div(uspi->s_dsize, uspi->s_minfree, 100); + if (uspi->s_minfree <= 5) { + uspi->s_time_to_space = ~0ULL; + uspi->s_space_to_time = 0; + usb1->fs_optim = cpu_to_fs32(sb, UFS_OPTSPACE); + } else { + uspi->s_time_to_space = (uspi->s_root_blocks / 2) + 1; + uspi->s_space_to_time = mul_u64_u32_div(uspi->s_dsize, + uspi->s_minfree - 2, 100) - 1; + } /* * Compute another frequently used values -- cgit v1.2.3