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Add the "nocache" nullfs mount option, which disables the caching of

Browse source 
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
This commit is contained in:
Konstantin Belousov 2013-01-03 19:17:57 +00:00
parent 0dcbedfa61
commit 9cf4c952ca
4 changed files with 63 additions and 13 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

8
sys/fs/nullfs/null.h
View file

@ -34,9 +34,15 @@
* $FreeBSD$
*/
#ifndef FS_NULL_H
#define FS_NULL_H
#define NULLM_CACHE 0x0001
struct null_mount {
struct mount *nullm_vfs;
struct vnode *nullm_rootvp; /* Reference to root null_node */
uint64_t nullm_flags;
};
#ifdef _KERNEL
@ -80,3 +86,5 @@ MALLOC_DECLARE(M_NULLFSNODE);
#endif /* NULLFS_DEBUG */
#endif /* _KERNEL */
#endif

3
sys/fs/nullfs/null_subr.c
View file

@ -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);

50
sys/fs/nullfs/null_vfsops.c
View file

@ -67,6 +67,15 @@ static vfs_vget_t nullfs_vget;
static vfs_extattrctl_t nullfs_extattrctl;
static vfs_reclaim_lowervp_t nullfs_reclaim_lowervp;
/* Mount options that we support. */
static const char *nullfs_opts[] = {
"cache",
"export",
"from",
"target",
NULL
};
/*
* Mount null layer
*/
@ -86,9 +95,11 @@ nullfs_mount(struct mount *mp)
if (!prison_allow(td->td_ucred, PR_ALLOW_MOUNT_NULLFS))
return (EPERM);
if (mp->mnt_flag & MNT_ROOTFS)
return (EOPNOTSUPP);
if (vfs_filteropt(mp->mnt_optnew, nullfs_opts))
return (EINVAL);
/*
* Update is a no-op
*/
@ -149,7 +160,7 @@ nullfs_mount(struct mount *mp)
}
xmp = (struct null_mount *) malloc(sizeof(struct null_mount),
M_NULLFSMNT, M_WAITOK);
M_NULLFSMNT, M_WAITOK | M_ZERO);
/*
* Save reference to underlying FS
@ -187,16 +198,27 @@ nullfs_mount(struct mount *mp)
mp->mnt_flag |= MNT_LOCAL;
MNT_IUNLOCK(mp);
}
xmp->nullm_flags |= NULLM_CACHE;
if (vfs_getopt(mp->mnt_optnew, "nocache", NULL, NULL) == 0)
xmp->nullm_flags &= ~NULLM_CACHE;
MNT_ILOCK(mp);
mp->mnt_kern_flag |= lowerrootvp->v_mount->mnt_kern_flag &
(MNTK_SHARED_WRITES | MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED);
if ((xmp->nullm_flags & NULLM_CACHE) != 0) {
mp->mnt_kern_flag |= lowerrootvp->v_mount->mnt_kern_flag &
(MNTK_SHARED_WRITES | MNTK_LOOKUP_SHARED |
MNTK_EXTENDED_SHARED);
}
mp->mnt_kern_flag |= MNTK_LOOKUP_EXCL_DOTDOT;
MNT_IUNLOCK(mp);
mp->mnt_data = xmp;
vfs_getnewfsid(mp);
MNT_ILOCK(xmp->nullm_vfs);
TAILQ_INSERT_TAIL(&xmp->nullm_vfs->mnt_uppers, mp, mnt_upper_link);
MNT_IUNLOCK(xmp->nullm_vfs);
if ((xmp->nullm_flags & NULLM_CACHE) != 0) {
MNT_ILOCK(xmp->nullm_vfs);
TAILQ_INSERT_TAIL(&xmp->nullm_vfs->mnt_uppers, mp,
mnt_upper_link);
MNT_IUNLOCK(xmp->nullm_vfs);
}
vfs_mountedfrom(mp, target);
@ -234,13 +256,15 @@ nullfs_unmount(mp, mntflags)
*/
mntdata = mp->mnt_data;
ump = mntdata->nullm_vfs;
MNT_ILOCK(ump);
while ((ump->mnt_kern_flag & MNTK_VGONE_UPPER) != 0) {
ump->mnt_kern_flag |= MNTK_VGONE_WAITER;
msleep(&ump->mnt_uppers, &ump->mnt_mtx, 0, "vgnupw", 0);
if ((mntdata->nullm_flags & NULLM_CACHE) != 0) {
MNT_ILOCK(ump);
while ((ump->mnt_kern_flag & MNTK_VGONE_UPPER) != 0) {
ump->mnt_kern_flag |= MNTK_VGONE_WAITER;
msleep(&ump->mnt_uppers, &ump->mnt_mtx, 0, "vgnupw", 0);
}
TAILQ_REMOVE(&ump->mnt_uppers, mp, mnt_upper_link);
MNT_IUNLOCK(ump);
}
TAILQ_REMOVE(&ump->mnt_uppers, mp, mnt_upper_link);
MNT_IUNLOCK(ump);
mp->mnt_data = NULL;
free(mntdata, M_NULLFSMNT);
return (0);

15
sys/fs/nullfs/null_vnops.c
View file

@ -692,7 +692,22 @@ null_unlock(struct vop_unlock_args *ap)
static int
null_inactive(struct vop_inactive_args *ap __unused)
{
struct vnode *vp;
struct mount *mp;
struct null_mount *xmp;
vp = ap->a_vp;
mp = vp->v_mount;
xmp = MOUNTTONULLMOUNT(mp);
if ((xmp->nullm_flags & NULLM_CACHE) == 0) {
/*
* If this is the last reference and caching of the
* nullfs vnodes is not enabled, then free up the
* vnode so as not to tie up the lower vnodes.
*/
vp->v_object = NULL;
vrecycle(vp);
}
return (0);
}