diff options
Diffstat (limited to 'sys/fs/nullfs')
-rw-r--r-- | sys/fs/nullfs/null.h | 8 | ||||
-rw-r--r-- | sys/fs/nullfs/null_subr.c | 3 | ||||
-rw-r--r-- | sys/fs/nullfs/null_vfsops.c | 50 | ||||
-rw-r--r-- | sys/fs/nullfs/null_vnops.c | 15 |
4 files changed, 63 insertions, 13 deletions
diff --git a/sys/fs/nullfs/null.h b/sys/fs/nullfs/null.h index 0878e55..4f37020 100644 --- a/sys/fs/nullfs/null.h +++ b/sys/fs/nullfs/null.h @@ -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 diff --git a/sys/fs/nullfs/null_subr.c b/sys/fs/nullfs/null_subr.c index b2c7a75..0b72249 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); diff --git a/sys/fs/nullfs/null_vfsops.c b/sys/fs/nullfs/null_vfsops.c index 7d84d51..5abfa49 100644 --- a/sys/fs/nullfs/null_vfsops.c +++ b/sys/fs/nullfs/null_vfsops.c @@ -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); diff --git a/sys/fs/nullfs/null_vnops.c b/sys/fs/nullfs/null_vnops.c index f530ed2..cc35d81 100644 --- a/sys/fs/nullfs/null_vnops.c +++ b/sys/fs/nullfs/null_vnops.c @@ -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); } |