/*
* Free reference to unionfs layer
*/
static int
unionfs_unmount(struct mount *mp, int mntflags)
{
struct unionfs_mount *ump;
int error;
int num;
int freeing;
int flags;
UNIONFSDEBUG("unionfs_unmount: mp = %p\n", (void *)mp);
ump = MOUNTTOUNIONFSMOUNT(mp);
flags = 0;
if (mntflags & MNT_FORCE)
flags |= FORCECLOSE;
/* vflush (no need to call vrele) */
for (freeing = 0; (error = vflush(mp, 1, flags, curthread)) != 0;) {
num = mp->mnt_nvnodelistsize;
if (num == freeing)
break;
freeing = num;
}
if (error)
return (error);
free(ump, M_UNIONFSMNT);
mp->mnt_data = 0;
return (0);
}
static int
unionfs_statfs(struct mount *mp, struct statfs *sbp)
{
struct unionfs_mount *ump;
int error;
struct statfs *mstat;
uint64_t lbsize;
ump = MOUNTTOUNIONFSMOUNT(mp);
UNIONFSDEBUG("unionfs_statfs(mp = %p, lvp = %p, uvp = %p)\n",
(void *)mp, (void *)ump->um_lowervp, (void *)ump->um_uppervp);
mstat = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK | M_ZERO);
error = VFS_STATFS(ump->um_lowervp->v_mount, mstat);
if (error) {
free(mstat, M_STATFS);
return (error);
}
/* now copy across the "interesting" information and fake the rest */
sbp->f_blocks = mstat->f_blocks;
sbp->f_files = mstat->f_files;
lbsize = mstat->f_bsize;
error = VFS_STATFS(ump->um_uppervp->v_mount, mstat);
if (error) {
free(mstat, M_STATFS);
return (error);
}
/*
* The FS type etc is copy from upper vfs.
* (write able vfs have priority)
*/
sbp->f_type = mstat->f_type;
sbp->f_flags = mstat->f_flags;
sbp->f_bsize = mstat->f_bsize;
sbp->f_iosize = mstat->f_iosize;
if (mstat->f_bsize != lbsize)
sbp->f_blocks = ((off_t)sbp->f_blocks * lbsize) /
mstat->f_bsize;
sbp->f_blocks += mstat->f_blocks;
sbp->f_bfree = mstat->f_bfree;
sbp->f_bavail = mstat->f_bavail;
sbp->f_files += mstat->f_files;
sbp->f_ffree = mstat->f_ffree;
free(mstat, M_STATFS);
return (0);
}
static int
unionfs_quotactl(struct mount *mp, int cmd, uid_t uid, void *arg)
{
struct unionfs_mount *ump;
ump = MOUNTTOUNIONFSMOUNT(mp);
/*
* Writing is always performed to upper vnode.
*/
return (VFS_QUOTACTL(ump->um_uppervp->v_mount, cmd, uid, arg));
}
static int
unionfs_rmdir(void *v)
{
struct vop_rmdir_args *ap = v;
int error;
struct unionfs_node *dunp;
struct unionfs_node *unp;
struct unionfs_mount *ump;
struct componentname *cnp;
struct vnode *udvp;
struct vnode *uvp;
struct vnode *lvp;
UNIONFS_INTERNAL_DEBUG("unionfs_rmdir: enter\n");
error = 0;
dunp = VTOUNIONFS(ap->a_dvp);
unp = VTOUNIONFS(ap->a_vp);
cnp = ap->a_cnp;
udvp = dunp->un_uppervp;
uvp = unp->un_uppervp;
lvp = unp->un_lowervp;
if (udvp == NULLVP)
return (EROFS);
if (udvp == uvp)
return (EOPNOTSUPP);
if (uvp != NULLVP) {
if (lvp != NULLVP) {
error = unionfs_check_rmdir(ap->a_vp, cnp->cn_cred);
if (error != 0)
return (error);
}
ump = MOUNTTOUNIONFSMOUNT(ap->a_vp->v_mount);
if (ump->um_whitemode == UNIONFS_WHITE_ALWAYS || lvp != NULLVP)
cnp->cn_flags |= DOWHITEOUT;
error = VOP_RMDIR(udvp, uvp, cnp);
}
else if (lvp != NULLVP)
error = unionfs_mkwhiteout(udvp, cnp, unp->un_path);
if (error == 0) {
cache_purge(ap->a_dvp);
cache_purge(ap->a_vp);
}
UNIONFS_INTERNAL_DEBUG("unionfs_rmdir: leave (%d)\n", error);
return (error);
}
static int
unionfs_getattr(void *v)
{
struct vop_getattr_args *ap = v;
int error;
struct unionfs_node *unp;
struct unionfs_mount *ump;
struct vnode *uvp;
struct vnode *lvp;
struct vattr va;
UNIONFS_INTERNAL_DEBUG("unionfs_getattr: enter\n");
unp = VTOUNIONFS(ap->a_vp);
ump = MOUNTTOUNIONFSMOUNT(ap->a_vp->v_mount);
uvp = unp->un_uppervp;
lvp = unp->un_lowervp;
if (uvp != NULLVP) {
if ((error = VOP_GETATTR(uvp, ap->a_vap, ap->a_cred)) == 0)
ap->a_vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsid;
UNIONFS_INTERNAL_DEBUG("unionfs_getattr: leave mode=%o, uid=%d, gid=%d (%d)\n",
ap->a_vap->va_mode, ap->a_vap->va_uid,
ap->a_vap->va_gid, error);
return (error);
}
error = VOP_GETATTR(lvp, ap->a_vap, ap->a_cred);
if (error == 0 && !(ump->um_uppervp->v_mount->mnt_flag & MNT_RDONLY)) {
/* correct the attr toward shadow file/dir. */
if (ap->a_vp->v_type == VREG || ap->a_vp->v_type == VDIR) {
unionfs_create_uppervattr_core(ump, ap->a_vap, &va);
ap->a_vap->va_mode = va.va_mode;
ap->a_vap->va_uid = va.va_uid;
ap->a_vap->va_gid = va.va_gid;
}
}
if (error == 0)
ap->a_vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsid;
UNIONFS_INTERNAL_DEBUG("unionfs_getattr: leave mode=%o, uid=%d, gid=%d (%d)\n",
ap->a_vap->va_mode, ap->a_vap->va_uid, ap->a_vap->va_gid, error);
return (error);
}
static int
unionfs_root(struct mount *mp, int flags, struct vnode **vpp)
{
struct unionfs_mount *ump;
struct vnode *vp;
ump = MOUNTTOUNIONFSMOUNT(mp);
vp = ump->um_rootvp;
UNIONFSDEBUG("unionfs_root: rootvp=%p locked=%x\n",
vp, VOP_ISLOCKED(vp));
vref(vp);
if (flags & LK_TYPE_MASK)
vn_lock(vp, flags);
*vpp = vp;
return (0);
}
static int
unionfs_remove(void *v)
{
struct vop_remove_args *ap = v;
int error;
struct unionfs_node *dunp;
struct unionfs_node *unp;
struct unionfs_mount *ump;
struct vnode *udvp;
struct vnode *uvp;
struct vnode *lvp;
struct componentname *cnp;
UNIONFS_INTERNAL_DEBUG("unionfs_remove: enter\n");
error = 0;
dunp = VTOUNIONFS(ap->a_dvp);
unp = VTOUNIONFS(ap->a_vp);
udvp = dunp->un_uppervp;
uvp = unp->un_uppervp;
lvp = unp->un_lowervp;
cnp = ap->a_cnp;
if (udvp == NULLVP)
return (EROFS);
if (uvp != NULLVP) {
ump = MOUNTTOUNIONFSMOUNT(ap->a_vp->v_mount);
if (ump->um_whitemode == UNIONFS_WHITE_ALWAYS || lvp != NULLVP)
cnp->cn_flags |= DOWHITEOUT;
error = VOP_REMOVE(udvp, uvp, cnp);
} else if (lvp != NULLVP)
error = unionfs_mkwhiteout(udvp, cnp, unp->un_path);
UNIONFS_INTERNAL_DEBUG("unionfs_remove: leave (%d)\n", error);
return (error);
}
static int
unionfs_rename(void *v)
{
struct vop_rename_args *ap = v;
int error;
struct vnode *fdvp;
struct vnode *fvp;
struct componentname *fcnp;
struct vnode *tdvp;
struct vnode *tvp;
struct componentname *tcnp;
struct vnode *ltdvp;
struct vnode *ltvp;
/* rename target vnodes */
struct vnode *rfdvp;
struct vnode *rfvp;
struct vnode *rtdvp;
struct vnode *rtvp;
int needrelookup;
struct unionfs_mount *ump;
struct unionfs_node *unp;
UNIONFS_INTERNAL_DEBUG("unionfs_rename: enter\n");
error = 0;
fdvp = ap->a_fdvp;
fvp = ap->a_fvp;
fcnp = ap->a_fcnp;
tdvp = ap->a_tdvp;
tvp = ap->a_tvp;
tcnp = ap->a_tcnp;
ltdvp = NULLVP;
ltvp = NULLVP;
rfdvp = fdvp;
rfvp = fvp;
rtdvp = tdvp;
rtvp = tvp;
needrelookup = 0;
/* check for cross device rename */
if (fvp->v_mount != tdvp->v_mount ||
(tvp != NULLVP && fvp->v_mount != tvp->v_mount)) {
error = EXDEV;
goto unionfs_rename_abort;
}
/* Renaming a file to itself has no effect. */
if (fvp == tvp)
goto unionfs_rename_abort;
/*
* from/to vnode is unionfs node.
*/
unp = VTOUNIONFS(fdvp);
#ifdef UNIONFS_IDBG_RENAME
UNIONFS_INTERNAL_DEBUG("fdvp=%p, ufdvp=%p, lfdvp=%p\n", fdvp, unp->un_uppervp, unp->un_lowervp);
#endif
if (unp->un_uppervp == NULLVP) {
error = ENODEV;
goto unionfs_rename_abort;
}
rfdvp = unp->un_uppervp;
vref(rfdvp);
unp = VTOUNIONFS(fvp);
#ifdef UNIONFS_IDBG_RENAME
UNIONFS_INTERNAL_DEBUG("fvp=%p, ufvp=%p, lfvp=%p\n", fvp, unp->un_uppervp, unp->un_lowervp);
#endif
ump = MOUNTTOUNIONFSMOUNT(fvp->v_mount);
if (unp->un_uppervp == NULLVP) {
switch (fvp->v_type) {
case VREG:
if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0)
goto unionfs_rename_abort;
error = unionfs_copyfile(unp, 1, fcnp->cn_cred);
VOP_UNLOCK(fvp);
if (error != 0)
goto unionfs_rename_abort;
break;
case VDIR:
if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0)
goto unionfs_rename_abort;
error = unionfs_mkshadowdir(ump, rfdvp, unp, fcnp);
VOP_UNLOCK(fvp);
if (error != 0)
goto unionfs_rename_abort;
break;
default:
error = ENODEV;
goto unionfs_rename_abort;
}
needrelookup = 1;
}
if (unp->un_lowervp != NULLVP)
fcnp->cn_flags |= DOWHITEOUT;
rfvp = unp->un_uppervp;
vref(rfvp);
unp = VTOUNIONFS(tdvp);
#ifdef UNIONFS_IDBG_RENAME
UNIONFS_INTERNAL_DEBUG("tdvp=%p, utdvp=%p, ltdvp=%p\n", tdvp, unp->un_uppervp, unp->un_lowervp);
#endif
if (unp->un_uppervp == NULLVP) {
error = ENODEV;
goto unionfs_rename_abort;
}
rtdvp = unp->un_uppervp;
ltdvp = unp->un_lowervp;
vref(rtdvp);
if (tdvp == tvp) {
rtvp = rtdvp;
vref(rtvp);
} else if (tvp != NULLVP) {
unp = VTOUNIONFS(tvp);
#ifdef UNIONFS_IDBG_RENAME
UNIONFS_INTERNAL_DEBUG("tvp=%p, utvp=%p, ltvp=%p\n", tvp, unp->un_uppervp, unp->un_lowervp);
#endif
if (unp->un_uppervp == NULLVP)
rtvp = NULLVP;
else {
if (tvp->v_type == VDIR) {
error = EINVAL;
goto unionfs_rename_abort;
}
rtvp = unp->un_uppervp;
ltvp = unp->un_lowervp;
vref(rtvp);
}
}
if (needrelookup != 0) {
if ((error = vn_lock(fdvp, LK_EXCLUSIVE)) != 0)
goto unionfs_rename_abort;
error = unionfs_relookup_for_delete(fdvp, fcnp);
VOP_UNLOCK(fdvp);
if (error != 0)
goto unionfs_rename_abort;
/* Locke of tvp is canceled in order to avoid recursive lock. */
if (tvp != NULLVP && tvp != tdvp)
VOP_UNLOCK(tvp);
error = unionfs_relookup_for_rename(tdvp, tcnp);
if (tvp != NULLVP && tvp != tdvp)
vn_lock(tvp, LK_EXCLUSIVE | LK_RETRY);
if (error != 0)
goto unionfs_rename_abort;
}
error = VOP_RENAME(rfdvp, rfvp, fcnp, rtdvp, rtvp, tcnp);
if (error == 0) {
if (rtvp != NULLVP && rtvp->v_type == VDIR)
cache_purge(tdvp);
if (fvp->v_type == VDIR && fdvp != tdvp)
cache_purge(fdvp);
}
if (fdvp != rfdvp)
vrele(fdvp);
if (fvp != rfvp)
vrele(fvp);
if (ltdvp != NULLVP)
VOP_UNLOCK(ltdvp);
if (tdvp != rtdvp)
vrele(tdvp);
if (ltvp != NULLVP)
VOP_UNLOCK(ltvp);
if (tvp != rtvp && tvp != NULLVP) {
if (rtvp == NULLVP)
vput(tvp);
else
vrele(tvp);
}
UNIONFS_INTERNAL_DEBUG("unionfs_rename: leave (%d)\n", error);
return (error);
unionfs_rename_abort:
if (fdvp != rfdvp)
vrele(rfdvp);
if (fvp != rfvp)
vrele(rfvp);
if (tdvp != rtdvp)
vrele(rtdvp);
vput(tdvp);
if (tvp != rtvp && rtvp != NULLVP)
vrele(rtvp);
if (tvp != NULLVP) {
if (tdvp != tvp)
vput(tvp);
else
vrele(tvp);
}
vrele(fdvp);
vrele(fvp);
UNIONFS_INTERNAL_DEBUG("unionfs_rename: leave (%d)\n", error);
return (error);
}
static int
unionfs_lookup(void *v)
{
struct vop_lookup_args *ap = v;
int iswhiteout;
int lockflag;
int error , uerror, lerror;
u_long nameiop;
u_long cnflags, cnflagsbk;
struct unionfs_node *dunp;
struct vnode *dvp, *udvp, *ldvp, *vp, *uvp, *lvp, *dtmpvp;
struct vattr va;
struct componentname *cnp;
iswhiteout = 0;
lockflag = 0;
error = uerror = lerror = ENOENT;
cnp = ap->a_cnp;
nameiop = cnp->cn_nameiop;
cnflags = cnp->cn_flags;
dvp = ap->a_dvp;
dunp = VTOUNIONFS(dvp);
udvp = dunp->un_uppervp;
ldvp = dunp->un_lowervp;
vp = uvp = lvp = NULLVP;
*(ap->a_vpp) = NULLVP;
UNIONFS_INTERNAL_DEBUG("unionfs_lookup: enter: nameiop=%ld, flags=%lx, path=%s\n", nameiop, cnflags, cnp->cn_nameptr);
if (dvp->v_type != VDIR)
return (ENOTDIR);
/*
* If read-only and op is not LOOKUP, will return EROFS.
*/
if ((cnflags & ISLASTCN) &&
(dvp->v_mount->mnt_flag & MNT_RDONLY) &&
LOOKUP != nameiop)
return (EROFS);
/*
* lookup dotdot
*/
if (cnflags & ISDOTDOT) {
if (LOOKUP != nameiop && udvp == NULLVP)
return (EROFS);
if (udvp != NULLVP) {
dtmpvp = udvp;
if (ldvp != NULLVP)
VOP_UNLOCK(ldvp);
}
else
dtmpvp = ldvp;
error = VOP_LOOKUP(dtmpvp, &vp, cnp);
if (dtmpvp == udvp && ldvp != NULLVP) {
VOP_UNLOCK(udvp);
vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
}
if (error == 0) {
/*
* Exchange lock and reference from vp to
* dunp->un_dvp. vp is upper/lower vnode, but it
* will need to return the unionfs vnode.
*/
if (nameiop == DELETE || nameiop == RENAME)
VOP_UNLOCK(vp);
vrele(vp);
VOP_UNLOCK(dvp);
*(ap->a_vpp) = dunp->un_dvp;
vref(dunp->un_dvp);
vn_lock(dunp->un_dvp, LK_EXCLUSIVE | LK_RETRY);
vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
} else if (error == ENOENT && nameiop != CREATE)
cache_enter(dvp, NULLVP, cnp->cn_nameptr,
cnp->cn_namelen, cnp->cn_flags);
UNIONFS_INTERNAL_DEBUG("unionfs_lookup: leave (%d)\n", error);
return (error);
}
/*
* lookup upper layer
*/
if (udvp != NULLVP) {
uerror = VOP_LOOKUP(udvp, &uvp, cnp);
if (uerror == 0) {
if (udvp == uvp) { /* is dot */
vrele(uvp);
*(ap->a_vpp) = dvp;
vref(dvp);
UNIONFS_INTERNAL_DEBUG("unionfs_lookup: leave (%d)\n", uerror);
return (uerror);
}
}
/* check whiteout */
if (uerror == ENOENT || uerror == EJUSTRETURN)
if (cnp->cn_flags & ISWHITEOUT)
iswhiteout = 1; /* don't lookup lower */
if (iswhiteout == 0 && ldvp != NULLVP)
if (VOP_GETATTR(udvp, &va, cnp->cn_cred) == 0 &&
(va.va_flags & OPAQUE))
iswhiteout = 1; /* don't lookup lower */
#if 0
UNIONFS_INTERNAL_DEBUG("unionfs_lookup: debug: whiteout=%d, path=%s\n", iswhiteout, cnp->cn_nameptr);
#endif
}
/*
* lookup lower layer
*/
if (ldvp != NULLVP && !(cnflags & DOWHITEOUT) && iswhiteout == 0) {
/* always op is LOOKUP */
cnp->cn_nameiop = LOOKUP;
cnflagsbk = cnp->cn_flags;
cnp->cn_flags = cnflags;
lerror = VOP_LOOKUP(ldvp, &lvp, cnp);
cnp->cn_nameiop = nameiop;
if (udvp != NULLVP && (uerror == 0 || uerror == EJUSTRETURN))
cnp->cn_flags = cnflagsbk;
if (lerror == 0) {
if (ldvp == lvp) { /* is dot */
if (uvp != NULLVP)
vrele(uvp); /* no need? */
vrele(lvp);
*(ap->a_vpp) = dvp;
vref(dvp);
UNIONFS_INTERNAL_DEBUG("unionfs_lookup: leave (%d)\n", lerror);
if (uvp != NULL)
VOP_UNLOCK(uvp);
return (lerror);
}
}
}
/*
* check lookup result
*/
if (uvp == NULLVP && lvp == NULLVP) {
UNIONFS_INTERNAL_DEBUG("unionfs_lookup: leave (%d)\n",
(udvp != NULLVP ? uerror : lerror));
return (udvp != NULLVP ? uerror : lerror);
}
/*
* check vnode type
*/
if (uvp != NULLVP && lvp != NULLVP && uvp->v_type != lvp->v_type) {
vput(lvp);
lvp = NULLVP;
}
/*
* check shadow dir
*/
if (uerror != 0 && uerror != EJUSTRETURN && udvp != NULLVP &&
lerror == 0 && lvp != NULLVP && lvp->v_type == VDIR &&
!(dvp->v_mount->mnt_flag & MNT_RDONLY) &&
(1 < cnp->cn_namelen || '.' != *(cnp->cn_nameptr))) {
/* get unionfs vnode in order to create a new shadow dir. */
error = unionfs_nodeget(dvp->v_mount, NULLVP, lvp, dvp, &vp,
cnp);
if (error != 0)
goto unionfs_lookup_out;
error = unionfs_mkshadowdir(MOUNTTOUNIONFSMOUNT(dvp->v_mount),
udvp, VTOUNIONFS(vp), cnp);
if (error != 0) {
UNIONFSDEBUG("unionfs_lookup: Unable to create shadow dir.");
vput(vp);
goto unionfs_lookup_out;
}
}
/*
* get unionfs vnode.
*/
else {
if (uvp != NULLVP)
error = uerror;
else
error = lerror;
if (error != 0)
goto unionfs_lookup_out;
error = unionfs_nodeget(dvp->v_mount, uvp, lvp, dvp, &vp, cnp);
if (error != 0) {
UNIONFSDEBUG("unionfs_lookup: Unable to create unionfs vnode.");
goto unionfs_lookup_out;
}
}
*(ap->a_vpp) = vp;
cache_enter(dvp, vp, cnp->cn_nameptr, cnp->cn_namelen,
cnp->cn_flags);
/* XXXAD lock status on error */
unionfs_lookup_out:
if (uvp != NULLVP)
vrele(uvp);
if (lvp != NULLVP)
vrele(lvp);
if (error == ENOENT && nameiop != CREATE)
cache_enter(dvp, NULLVP, cnp->cn_nameptr, cnp->cn_namelen,
cnp->cn_flags);
UNIONFS_INTERNAL_DEBUG("unionfs_lookup: leave (%d)\n", error);
return (error);
}
static int
unionfs_access(void *v)
{
struct vop_access_args *ap = v;
struct unionfs_mount *ump;
struct unionfs_node *unp;
struct vnode *uvp;
struct vnode *lvp;
struct vattr va;
int mode;
int error;
UNIONFS_INTERNAL_DEBUG("unionfs_access: enter\n");
ump = MOUNTTOUNIONFSMOUNT(ap->a_vp->v_mount);
unp = VTOUNIONFS(ap->a_vp);
uvp = unp->un_uppervp;
lvp = unp->un_lowervp;
mode = ap->a_mode;
error = EACCES;
if ((mode & VWRITE) &&
(ap->a_vp->v_mount->mnt_flag & MNT_RDONLY)) {
switch (ap->a_vp->v_type) {
case VREG:
case VDIR:
case VLNK:
return (EROFS);
default:
break;
}
}
if (uvp != NULLVP) {
error = VOP_ACCESS(uvp, mode, ap->a_cred);
UNIONFS_INTERNAL_DEBUG("unionfs_access: leave (%d)\n", error);
return (error);
}
if (lvp != NULLVP) {
if (mode & VWRITE) {
if (ump->um_uppervp->v_mount->mnt_flag & MNT_RDONLY) {
switch (ap->a_vp->v_type) {
case VREG:
case VDIR:
case VLNK:
return (EROFS);
default:
break;
}
} else if (ap->a_vp->v_type == VREG || ap->a_vp->v_type == VDIR) {
/* check shadow file/dir */
if (ump->um_copymode != UNIONFS_TRANSPARENT) {
error = unionfs_create_uppervattr(ump,
lvp, &va, ap->a_cred);
if (error != 0)
return (error);
error = unionfs_check_corrected_access(
mode, &va, ap->a_cred);
if (error != 0)
return (error);
}
}
mode &= ~VWRITE;
mode |= VREAD; /* will copy to upper */
}
error = VOP_ACCESS(lvp, mode, ap->a_cred);
}
UNIONFS_INTERNAL_DEBUG("unionfs_access: leave (%d)\n", error);
return (error);
}
/*
* Make a new or get existing unionfs node.
*
* uppervp and lowervp should be unlocked. Because if new unionfs vnode is
* locked, uppervp or lowervp is locked too. In order to prevent dead lock,
* you should not lock plurality simultaneously.
*/
int
unionfs_nodeget(struct mount *mp, struct vnode *uppervp,
struct vnode *lowervp, struct vnode *dvp,
struct vnode **vpp, struct componentname *cnp,
struct thread *td)
{
struct unionfs_mount *ump;
struct unionfs_node *unp;
struct vnode *vp;
int error;
int lkflags;
enum vtype vt;
char *path;
ump = MOUNTTOUNIONFSMOUNT(mp);
lkflags = (cnp ? cnp->cn_lkflags : 0);
path = (cnp ? cnp->cn_nameptr : NULL);
*vpp = NULLVP;
if (uppervp == NULLVP && lowervp == NULLVP)
panic("unionfs_nodeget: upper and lower is null");
vt = (uppervp != NULLVP ? uppervp->v_type : lowervp->v_type);
/* If it has no ISLASTCN flag, path check is skipped. */
if (cnp && !(cnp->cn_flags & ISLASTCN))
path = NULL;
/* check the cache */
if (path != NULL && dvp != NULLVP && vt == VDIR) {
vp = unionfs_get_cached_vnode(uppervp, lowervp, dvp, path);
if (vp != NULLVP) {
vref(vp);
*vpp = vp;
goto unionfs_nodeget_out;
}
}
if ((uppervp == NULLVP || ump->um_uppervp != uppervp) ||
(lowervp == NULLVP || ump->um_lowervp != lowervp)) {
/* dvp will be NULLVP only in case of root vnode. */
if (dvp == NULLVP)
return (EINVAL);
}
/*
* Do the MALLOC before the getnewvnode since doing so afterward
* might cause a bogus v_data pointer to get dereferenced elsewhere
* if MALLOC should block.
*/
unp = malloc(sizeof(struct unionfs_node),
M_UNIONFSNODE, M_WAITOK | M_ZERO);
error = getnewvnode("unionfs", mp, &unionfs_vnodeops, &vp);
if (error != 0) {
free(unp, M_UNIONFSNODE);
return (error);
}
error = insmntque(vp, mp); /* XXX: Too early for mpsafe fs */
if (error != 0) {
free(unp, M_UNIONFSNODE);
return (error);
}
if (dvp != NULLVP)
vref(dvp);
if (uppervp != NULLVP)
vref(uppervp);
if (lowervp != NULLVP)
vref(lowervp);
if (vt == VDIR)
unp->un_hashtbl = hashinit(NUNIONFSNODECACHE, M_UNIONFSHASH,
&(unp->un_hashmask));
unp->un_vnode = vp;
unp->un_uppervp = uppervp;
unp->un_lowervp = lowervp;
unp->un_dvp = dvp;
if (uppervp != NULLVP)
vp->v_vnlock = uppervp->v_vnlock;
else
vp->v_vnlock = lowervp->v_vnlock;
if (path != NULL) {
unp->un_path = (char *)
malloc(cnp->cn_namelen +1, M_UNIONFSPATH, M_WAITOK|M_ZERO);
bcopy(cnp->cn_nameptr, unp->un_path, cnp->cn_namelen);
unp->un_path[cnp->cn_namelen] = '\0';
}
vp->v_type = vt;
vp->v_data = unp;
if ((uppervp != NULLVP && ump->um_uppervp == uppervp) &&
(lowervp != NULLVP && ump->um_lowervp == lowervp))
vp->v_vflag |= VV_ROOT;
if (path != NULL && dvp != NULLVP && vt == VDIR)
*vpp = unionfs_ins_cached_vnode(unp, dvp, path);
if ((*vpp) != NULLVP) {
if (dvp != NULLVP)
vrele(dvp);
if (uppervp != NULLVP)
vrele(uppervp);
if (lowervp != NULLVP)
vrele(lowervp);
unp->un_uppervp = NULLVP;
unp->un_lowervp = NULLVP;
unp->un_dvp = NULLVP;
vrele(vp);
vp = *vpp;
vref(vp);
} else
*vpp = vp;
unionfs_nodeget_out:
if (lkflags & LK_TYPE_MASK)
vn_lock(vp, lkflags | LK_RETRY, td);
return (0);
}
static int
unionfs_checkexp(struct mount *mp, struct sockaddr *nam, int *extflagsp,
struct ucred **credanonp, int *numsecflavors, int **secflavors)
{
return (EOPNOTSUPP);
}
static int
unionfs_extattrctl(struct mount *mp, int cmd, struct vnode *filename_vp,
int namespace, const char *attrname)
{
struct unionfs_mount *ump;
struct unionfs_node *unp;
ump = MOUNTTOUNIONFSMOUNT(mp);
unp = VTOUNIONFS(filename_vp);
if (unp->un_uppervp != NULLVP) {
return (VFS_EXTATTRCTL(ump->um_uppervp->v_mount, cmd,
unp->un_uppervp, namespace, attrname));
} else {
return (VFS_EXTATTRCTL(ump->um_lowervp->v_mount, cmd,
unp->un_lowervp, namespace, attrname));
}
}
static struct vfsops unionfs_vfsops = {
.vfs_checkexp = unionfs_checkexp,
.vfs_extattrctl = unionfs_extattrctl,
.vfs_fhtovp = unionfs_fhtovp,
