Differential D30041 Diff 90910 sys/fs/unionfs/union_subr.c

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sys/fs/unionfs/union_subr.c

Show First 20 Lines • Show All 754 Lines • ▼ Show 20 Lines	unionfs_mkshadowdir(struct unionfs_mount ump, struct vnode udvp,
struct unionfs_node unp, struct componentname cnp,		struct unionfs_node unp, struct componentname cnp,
struct thread *td)		struct thread *td)
{		{
int error;		int error;
struct vnode *lvp;		struct vnode *lvp;
struct vnode *uvp;		struct vnode *uvp;
struct vattr va;		struct vattr va;
struct vattr lva;		struct vattr lva;
struct componentname cn;		struct nameidata nd;
struct mount *mp;		struct mount *mp;
struct ucred *cred;		struct ucred *cred;
struct ucred *credbk;		struct ucred *credbk;
struct uidinfo *rootinfo;		struct uidinfo *rootinfo;

if (unp->un_uppervp != NULLVP)		if (unp->un_uppervp != NULLVP)
return (EEXIST);		return (EEXIST);

Show All 10 Lines	unionfs_mkshadowdir(struct unionfs_mount ump, struct vnode udvp,
*/		*/
chgproccnt(cred->cr_ruidinfo, 1, 0);		chgproccnt(cred->cr_ruidinfo, 1, 0);
change_euid(cred, rootinfo);		change_euid(cred, rootinfo);
change_ruid(cred, rootinfo);		change_ruid(cred, rootinfo);
change_svuid(cred, (uid_t)0);		change_svuid(cred, (uid_t)0);
uifree(rootinfo);		uifree(rootinfo);
cnp->cn_cred = cred;		cnp->cn_cred = cred;

memset(&cn, 0, sizeof(cn));		memset(&nd.ni_cnd, 0, sizeof(struct componentname));
		NDPREINIT(&nd);

if ((error = VOP_GETATTR(lvp, &lva, cnp->cn_cred)))		if ((error = VOP_GETATTR(lvp, &lva, cnp->cn_cred)))
goto unionfs_mkshadowdir_abort;		goto unionfs_mkshadowdir_abort;

if ((error = unionfs_relookup(udvp, &uvp, cnp, &cn, td, cnp->cn_nameptr, cnp->cn_namelen, CREATE)))		if ((error = unionfs_relookup(udvp, &uvp, cnp, &nd.ni_cnd, td,
		cnp->cn_nameptr, cnp->cn_namelen, CREATE)))
goto unionfs_mkshadowdir_abort;		goto unionfs_mkshadowdir_abort;
if (uvp != NULLVP) {		if (uvp != NULLVP) {
if (udvp == uvp)		if (udvp == uvp)
vrele(uvp);		vrele(uvp);
else		else
vput(uvp);		vput(uvp);

error = EEXIST;		error = EEXIST;
goto unionfs_mkshadowdir_free_out;		goto unionfs_mkshadowdir_free_out;
}		}

if ((error = vn_start_write(udvp, &mp, V_WAIT \| PCATCH)))		if ((error = vn_start_write(udvp, &mp, V_WAIT \| PCATCH)))
goto unionfs_mkshadowdir_free_out;		goto unionfs_mkshadowdir_free_out;
unionfs_create_uppervattr_core(ump, &lva, &va, td);		unionfs_create_uppervattr_core(ump, &lva, &va, td);

error = VOP_MKDIR(udvp, &uvp, &cn, &va);		error = VOP_MKDIR(udvp, &uvp, &nd.ni_cnd, &va);

if (!error) {		if (!error) {
unionfs_node_update(unp, uvp, td);		unionfs_node_update(unp, uvp, td);

/*		/*
* XXX The bug which cannot set uid/gid was corrected.		* XXX The bug which cannot set uid/gid was corrected.
* Ignore errors.		* Ignore errors.
*/		*/
va.va_type = VNON;		va.va_type = VNON;
VOP_SETATTR(uvp, &va, cn.cn_cred);		VOP_SETATTR(uvp, &va, nd.ni_cnd.cn_cred);
}		}
vn_finished_write(mp);		vn_finished_write(mp);

unionfs_mkshadowdir_free_out:		unionfs_mkshadowdir_free_out:
if (cn.cn_flags & HASBUF) {		if (nd.ni_cnd.cn_flags & HASBUF) {
uma_zfree(namei_zone, cn.cn_pnbuf);		uma_zfree(namei_zone, nd.ni_cnd.cn_pnbuf);
cn.cn_flags &= ~HASBUF;		nd.ni_cnd.cn_flags &= ~HASBUF;
}		}

unionfs_mkshadowdir_abort:		unionfs_mkshadowdir_abort:
cnp->cn_cred = credbk;		cnp->cn_cred = credbk;
chgproccnt(cred->cr_ruidinfo, -1, 0);		chgproccnt(cred->cr_ruidinfo, -1, 0);
crfree(cred);		crfree(cred);

return (error);		return (error);
}		}

/*		/*
* Create a new whiteout.		* Create a new whiteout.
*		*
* dvp should be locked on entry and will be locked on return.		* dvp should be locked on entry and will be locked on return.
*/		*/
int		int
unionfs_mkwhiteout(struct vnode dvp, struct componentname cnp,		unionfs_mkwhiteout(struct vnode dvp, struct componentname cnp,
struct thread td, char path)		struct thread td, char path)
{		{
int error;		int error;
struct vnode *wvp;		struct vnode *wvp;
struct componentname cn;		struct nameidata nd;
struct mount *mp;		struct mount *mp;

if (path == NULL)		if (path == NULL)
path = cnp->cn_nameptr;		path = cnp->cn_nameptr;

wvp = NULLVP;		wvp = NULLVP;
if ((error = unionfs_relookup(dvp, &wvp, cnp, &cn, td, path, strlen(path), CREATE)))		NDPREINIT(&nd);
		if ((error = unionfs_relookup(dvp, &wvp, cnp, &nd.ni_cnd, td, path,
		strlen(path), CREATE)))
return (error);		return (error);
if (wvp != NULLVP) {		if (wvp != NULLVP) {
if (cn.cn_flags & HASBUF) {		if (nd.ni_cnd.cn_flags & HASBUF) {
uma_zfree(namei_zone, cn.cn_pnbuf);		uma_zfree(namei_zone, nd.ni_cnd.cn_pnbuf);
cn.cn_flags &= ~HASBUF;		nd.ni_cnd.cn_flags &= ~HASBUF;
}		}
if (dvp == wvp)		if (dvp == wvp)
vrele(wvp);		vrele(wvp);
else		else
vput(wvp);		vput(wvp);

return (EEXIST);		return (EEXIST);
}		}

if ((error = vn_start_write(dvp, &mp, V_WAIT \| PCATCH)))		if ((error = vn_start_write(dvp, &mp, V_WAIT \| PCATCH)))
goto unionfs_mkwhiteout_free_out;		goto unionfs_mkwhiteout_free_out;
error = VOP_WHITEOUT(dvp, &cn, CREATE);		error = VOP_WHITEOUT(dvp, &nd.ni_cnd, CREATE);

vn_finished_write(mp);		vn_finished_write(mp);

unionfs_mkwhiteout_free_out:		unionfs_mkwhiteout_free_out:
if (cn.cn_flags & HASBUF) {		if (nd.ni_cnd.cn_flags & HASBUF) {
uma_zfree(namei_zone, cn.cn_pnbuf);		uma_zfree(namei_zone, nd.ni_cnd.cn_pnbuf);
cn.cn_flags &= ~HASBUF;		nd.ni_cnd.cn_flags &= ~HASBUF;
}		}

return (error);		return (error);
}		}

/*		/*
* Create a new vnode for create a new shadow file.		* Create a new vnode for create a new shadow file.
*		*
Show All 9 Lines
{		{
struct unionfs_mount *ump;		struct unionfs_mount *ump;
struct vnode *vp;		struct vnode *vp;
struct vnode *lvp;		struct vnode *lvp;
struct ucred *cred;		struct ucred *cred;
struct vattr lva;		struct vattr lva;
int fmode;		int fmode;
int error;		int error;
struct componentname cn;		struct nameidata nd;

ump = MOUNTTOUNIONFSMOUNT(UNIONFSTOV(unp)->v_mount);		ump = MOUNTTOUNIONFSMOUNT(UNIONFSTOV(unp)->v_mount);
vp = NULLVP;		vp = NULLVP;
lvp = unp->un_lowervp;		lvp = unp->un_lowervp;
cred = td->td_ucred;		cred = td->td_ucred;
fmode = FFLAGS(O_WRONLY \| O_CREAT \| O_TRUNC \| O_EXCL);		fmode = FFLAGS(O_WRONLY \| O_CREAT \| O_TRUNC \| O_EXCL);
error = 0;		error = 0;

if ((error = VOP_GETATTR(lvp, &lva, cred)) != 0)		if ((error = VOP_GETATTR(lvp, &lva, cred)) != 0)
return (error);		return (error);
unionfs_create_uppervattr_core(ump, &lva, uvap, td);		unionfs_create_uppervattr_core(ump, &lva, uvap, td);

if (unp->un_path == NULL)		if (unp->un_path == NULL)
panic("unionfs: un_path is null");		panic("unionfs: un_path is null");

cn.cn_namelen = strlen(unp->un_path);		nd.ni_cnd.cn_namelen = strlen(unp->un_path);
cn.cn_pnbuf = uma_zalloc(namei_zone, M_WAITOK);		nd.ni_cnd.cn_pnbuf = uma_zalloc(namei_zone, M_WAITOK);
bcopy(unp->un_path, cn.cn_pnbuf, cn.cn_namelen + 1);		bcopy(unp->un_path, nd.ni_cnd.cn_pnbuf, nd.ni_cnd.cn_namelen + 1);
cn.cn_nameiop = CREATE;		nd.ni_cnd.cn_nameiop = CREATE;
cn.cn_flags = (LOCKPARENT \| LOCKLEAF \| HASBUF \| SAVENAME \| ISLASTCN);		nd.ni_cnd.cn_flags = LOCKPARENT \| LOCKLEAF \| HASBUF \| SAVENAME \|
cn.cn_lkflags = LK_EXCLUSIVE;		ISLASTCN;
cn.cn_thread = td;		nd.ni_cnd.cn_lkflags = LK_EXCLUSIVE;
cn.cn_cred = cred;		nd.ni_cnd.cn_thread = td;
cn.cn_nameptr = cn.cn_pnbuf;		nd.ni_cnd.cn_cred = cred;
		nd.ni_cnd.cn_nameptr = nd.ni_cnd.cn_pnbuf;
		NDPREINIT(&nd);

vref(udvp);		vref(udvp);
if ((error = relookup(udvp, &vp, &cn)) != 0)		if ((error = relookup(udvp, &vp, &nd.ni_cnd)) != 0)
goto unionfs_vn_create_on_upper_free_out2;		goto unionfs_vn_create_on_upper_free_out2;
vrele(udvp);		vrele(udvp);

if (vp != NULLVP) {		if (vp != NULLVP) {
if (vp == udvp)		if (vp == udvp)
vrele(vp);		vrele(vp);
else		else
vput(vp);		vput(vp);
error = EEXIST;		error = EEXIST;
goto unionfs_vn_create_on_upper_free_out1;		goto unionfs_vn_create_on_upper_free_out1;
}		}

if ((error = VOP_CREATE(udvp, &vp, &cn, uvap)) != 0)		if ((error = VOP_CREATE(udvp, &vp, &nd.ni_cnd, uvap)) != 0)
goto unionfs_vn_create_on_upper_free_out1;		goto unionfs_vn_create_on_upper_free_out1;

if ((error = VOP_OPEN(vp, fmode, cred, td, NULL)) != 0) {		if ((error = VOP_OPEN(vp, fmode, cred, td, NULL)) != 0) {
vput(vp);		vput(vp);
goto unionfs_vn_create_on_upper_free_out1;		goto unionfs_vn_create_on_upper_free_out1;
}		}
error = VOP_ADD_WRITECOUNT(vp, 1);		error = VOP_ADD_WRITECOUNT(vp, 1);
CTR3(KTR_VFS, "%s: vp %p v_writecount increased to %d", __func__, vp,		CTR3(KTR_VFS, "%s: vp %p v_writecount increased to %d", __func__, vp,
vp->v_writecount);		vp->v_writecount);
if (error == 0) {		if (error == 0) {
*vpp = vp;		*vpp = vp;
} else {		} else {
VOP_CLOSE(vp, fmode, cred, td);		VOP_CLOSE(vp, fmode, cred, td);
}		}

unionfs_vn_create_on_upper_free_out1:		unionfs_vn_create_on_upper_free_out1:
VOP_UNLOCK(udvp);		VOP_UNLOCK(udvp);

unionfs_vn_create_on_upper_free_out2:		unionfs_vn_create_on_upper_free_out2:
if (cn.cn_flags & HASBUF) {		if (nd.ni_cnd.cn_flags & HASBUF) {
uma_zfree(namei_zone, cn.cn_pnbuf);		uma_zfree(namei_zone, nd.ni_cnd.cn_pnbuf);
cn.cn_flags &= ~HASBUF;		nd.ni_cnd.cn_flags &= ~HASBUF;
}		}

return (error);		return (error);
}		}

/*		/*
* Copy from lvp to uvp.		* Copy from lvp to uvp.
*		*
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