int
layerfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp)
{
struct vnode *vp;
int error;
error = VFS_VGET(MOUNTTOLAYERMOUNT(mp)->layerm_vfs, ino, &vp);
if (error) {
*vpp = NULL;
return error;
}
VOP_UNLOCK(vp);
error = layer_node_create(mp, vp, vpp);
if (error) {
vrele(vp);
*vpp = NULL;
return error;
}
error = vn_lock(*vpp, LK_EXCLUSIVE);
if (error) {
vrele(*vpp);
*vpp = NULL;
return error;
}
return 0;
}
int
layerfs_fhtovp(struct mount *mp, struct fid *fidp, struct vnode **vpp)
{
struct vnode *vp;
int error;
error = VFS_FHTOVP(MOUNTTOLAYERMOUNT(mp)->layerm_vfs, fidp, &vp);
if (error) {
*vpp = NULL;
return error;
}
VOP_UNLOCK(vp);
error = layer_node_create(mp, vp, vpp);
if (error) {
vput(vp);
*vpp = NULL;
return (error);
}
error = vn_lock(*vpp, LK_EXCLUSIVE);
if (error) {
vrele(*vpp);
*vpp = NULL;
return error;
}
return 0;
}
/*
* Mount umap layer
*/
int
umapfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len)
{
struct lwp *l = curlwp;
struct pathbuf *pb;
struct nameidata nd;
struct umap_args *args = data;
struct vnode *lowerrootvp, *vp;
struct umap_mount *amp;
int error;
#ifdef UMAPFS_DIAGNOSTIC
int i;
#endif
if (args == NULL)
return EINVAL;
if (*data_len < sizeof *args)
return EINVAL;
if (mp->mnt_flag & MNT_GETARGS) {
amp = MOUNTTOUMAPMOUNT(mp);
if (amp == NULL)
return EIO;
args->la.target = NULL;
args->nentries = amp->info_nentries;
args->gnentries = amp->info_gnentries;
*data_len = sizeof *args;
return 0;
}
/* only for root */
error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT,
KAUTH_REQ_SYSTEM_MOUNT_UMAP, NULL, NULL, NULL);
if (error)
return error;
#ifdef UMAPFS_DIAGNOSTIC
printf("umapfs_mount(mp = %p)\n", mp);
#endif
/*
* Update is not supported
*/
if (mp->mnt_flag & MNT_UPDATE)
return EOPNOTSUPP;
/*
* Find lower node
*/
error = pathbuf_copyin(args->umap_target, &pb);
if (error) {
return error;
}
NDINIT(&nd, LOOKUP, FOLLOW|LOCKLEAF, pb);
if ((error = namei(&nd)) != 0) {
pathbuf_destroy(pb);
return error;
}
/*
* Sanity check on lower vnode
*/
lowerrootvp = nd.ni_vp;
pathbuf_destroy(pb);
#ifdef UMAPFS_DIAGNOSTIC
printf("vp = %p, check for VDIR...\n", lowerrootvp);
#endif
if (lowerrootvp->v_type != VDIR) {
vput(lowerrootvp);
return (EINVAL);
}
#ifdef UMAPFS_DIAGNOSTIC
printf("mp = %p\n", mp);
#endif
amp = kmem_zalloc(sizeof(struct umap_mount), KM_SLEEP);
mp->mnt_data = amp;
amp->umapm_vfs = lowerrootvp->v_mount;
if (amp->umapm_vfs->mnt_flag & MNT_LOCAL)
mp->mnt_flag |= MNT_LOCAL;
/*
* Now copy in the number of entries and maps for umap mapping.
*/
if (args->nentries > MAPFILEENTRIES || args->gnentries > GMAPFILEENTRIES) {
vput(lowerrootvp);
return (error);
}
amp->info_nentries = args->nentries;
amp->info_gnentries = args->gnentries;
error = copyin(args->mapdata, amp->info_mapdata,
2*sizeof(u_long)*args->nentries);
if (error) {
vput(lowerrootvp);
return (error);
}
#ifdef UMAPFS_DIAGNOSTIC
printf("umap_mount:nentries %d\n",args->nentries);
for (i = 0; i < args->nentries; i++)
printf(" %ld maps to %ld\n", amp->info_mapdata[i][0],
amp->info_mapdata[i][1]);
#endif
error = copyin(args->gmapdata, amp->info_gmapdata,
2*sizeof(u_long)*args->gnentries);
if (error) {
vput(lowerrootvp);
return (error);
}
#ifdef UMAPFS_DIAGNOSTIC
printf("umap_mount:gnentries %d\n",args->gnentries);
for (i = 0; i < args->gnentries; i++)
printf("\tgroup %ld maps to %ld\n",
amp->info_gmapdata[i][0],
amp->info_gmapdata[i][1]);
#endif
/*
* Make sure the mount point's sufficiently initialized
* that the node create call will work.
*/
vfs_getnewfsid(mp);
amp->umapm_size = sizeof(struct umap_node);
amp->umapm_tag = VT_UMAP;
amp->umapm_bypass = umap_bypass;
amp->umapm_vnodeop_p = umap_vnodeop_p;
/*
* fix up umap node for root vnode.
*/
VOP_UNLOCK(lowerrootvp);
error = layer_node_create(mp, lowerrootvp, &vp);
/*
* Make sure the node alias worked
*/
if (error) {
vrele(lowerrootvp);
kmem_free(amp, sizeof(struct umap_mount));
return error;
}
/*
* Keep a held reference to the root vnode.
* It is vrele'd in umapfs_unmount.
*/
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
vp->v_vflag |= VV_ROOT;
amp->umapm_rootvp = vp;
VOP_UNLOCK(vp);
error = set_statvfs_info(path, UIO_USERSPACE, args->umap_target,
UIO_USERSPACE, mp->mnt_op->vfs_name, mp, l);
#ifdef UMAPFS_DIAGNOSTIC
printf("umapfs_mount: lower %s, alias at %s\n",
mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname);
#endif
return error;
}
/*
* Mount overlay layer
*/
int
ov_mount(struct mount *mp, const char *path, void *data, size_t *data_len)
{
struct lwp *l = curlwp;
int error = 0;
struct overlay_args *args = data;
struct vnode *lowerrootvp, *vp;
struct overlay_mount *nmp;
struct layer_mount *lmp;
#ifdef OVERLAYFS_DIAGNOSTIC
printf("ov_mount(mp = %p)\n", mp);
#endif
if (args == NULL)
return EINVAL;
if (*data_len < sizeof *args)
return EINVAL;
if (mp->mnt_flag & MNT_GETARGS) {
lmp = MOUNTTOLAYERMOUNT(mp);
if (lmp == NULL)
return EIO;
args->la.target = NULL;
*data_len = sizeof *args;
return 0;
}
/*
* Update is not supported
*/
if (mp->mnt_flag & MNT_UPDATE)
return EOPNOTSUPP;
/*
* Find lower node
*/
lowerrootvp = mp->mnt_vnodecovered;
vref(lowerrootvp);
if ((error = vn_lock(lowerrootvp, LK_EXCLUSIVE | LK_RETRY))) {
vrele(lowerrootvp);
return (error);
}
/*
* First cut at fixing up upper mount point
*/
nmp = kmem_zalloc(sizeof(struct overlay_mount), KM_SLEEP);
mp->mnt_data = nmp;
nmp->ovm_vfs = lowerrootvp->v_mount;
if (nmp->ovm_vfs->mnt_flag & MNT_LOCAL)
mp->mnt_flag |= MNT_LOCAL;
/*
* Make sure that the mount point is sufficiently initialized
* that the node create call will work.
*/
vfs_getnewfsid(mp);
nmp->ovm_size = sizeof (struct overlay_node);
nmp->ovm_tag = VT_OVERLAY;
nmp->ovm_bypass = layer_bypass;
nmp->ovm_vnodeop_p = overlay_vnodeop_p;
/*
* Fix up overlay node for root vnode
*/
VOP_UNLOCK(lowerrootvp);
error = layer_node_create(mp, lowerrootvp, &vp);
/*
* Make sure the fixup worked
*/
if (error) {
vrele(lowerrootvp);
kmem_free(nmp, sizeof(struct overlay_mount));
return error;
}
/*
* Keep a held reference to the root vnode.
* It is vrele'd in ov_unmount.
*/
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
vp->v_vflag |= VV_ROOT;
nmp->ovm_rootvp = vp;
VOP_UNLOCK(vp);
error = set_statvfs_info(path, UIO_USERSPACE, args->la.target,
UIO_USERSPACE, mp->mnt_op->vfs_name, mp, l);
#ifdef OVERLAYFS_DIAGNOSTIC
printf("ov_mount: lower %s, alias at %s\n",
mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname);
#endif
return error;
}
