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authorAl Viro <viro@zeniv.linux.org.uk>2017-06-17 15:44:06 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2017-06-17 17:22:42 -0400
commit77e9ce327d9b607cd6e57c0f4524a654dc59c4b1 (patch)
treecb2bc18c6c0e09e2af7f5bbc3ad007acc77c8ebf /fs/ufs/super.c
parentc0ef65d2928249e822b813beb41b6c1478c556ab (diff)
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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 <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/ufs/super.c')
-rw-r--r--fs/ufs/super.c9
1 files changed, 9 insertions, 0 deletions
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