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| author | kib <kib@FreeBSD.org> | 2013-01-03 19:17:57 +0000 |
|---|---|---|
| committer | kib <kib@FreeBSD.org> | 2013-01-03 19:17:57 +0000 |
| commit | a7c71037dff32d49d32466102682ea2390f8d3a2 (patch) | |
| tree | b40d81bb8b27a27e533ff513285113179bcc22d8 /sys/fs/nullfs/null_subr.c | |
| parent | 5a9188f8d3a59199c437c0e2eec747d7e9227d77 (diff) | |
| download | FreeBSD-src-a7c71037dff32d49d32466102682ea2390f8d3a2.zip FreeBSD-src-a7c71037dff32d49d32466102682ea2390f8d3a2.tar.gz | |
Add the "nocache" nullfs mount option, which disables the caching of
the free nullfs vnodes, switching nullfs behaviour to pre-r240285.
The option is mostly intended as the last-resort when higher pressure
on the vnode cache due to doubling of the vnode counts is not
desirable.
Note that disabling the cache costs more than 2x wall time in the
metadata-hungry scenarious. The default is "cache".
Tested and benchmarked by: pho (previous version)
MFC after: 2 weeks
Diffstat (limited to 'sys/fs/nullfs/null_subr.c')
| -rw-r--r-- | sys/fs/nullfs/null_subr.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/sys/fs/nullfs/null_subr.c b/sys/fs/nullfs/null_subr.c index b2c7a75..f82d738 100644 --- a/sys/fs/nullfs/null_subr.c +++ b/sys/fs/nullfs/null_subr.c @@ -224,6 +224,9 @@ null_nodeget(mp, lowervp, vpp) * provide ready to use vnode. */ if (VOP_ISLOCKED(lowervp) != LK_EXCLUSIVE) { + KASSERT((MOUNTTONULLMOUNT(mp)->nullm_flags & NULLM_CACHE) == 0, + ("lowervp %p is not excl locked and cache is disabled", + lowervp)); vn_lock(lowervp, LK_UPGRADE | LK_RETRY); if ((lowervp->v_iflag & VI_DOOMED) != 0) { vput(lowervp); |
