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Support read-only mount.

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This commit is contained in:
KATO Takenori 1997-09-04 03:14:49 +00:00
parent 683cef3c33
commit 6ca02614a5
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=29084
2 changed files with 78 additions and 2 deletions
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40
sys/fs/unionfs/union_vnops.c
View File

@ -35,7 +35,7 @@
* SUCH DAMAGE.
*
* @(#)union_vnops.c 8.32 (Berkeley) 6/23/95
* $Id: union_vnops.c,v 1.38 1997/08/15 02:36:28 kato Exp $
* $Id: union_vnops.c,v 1.39 1997/09/02 20:06:13 bde Exp $
*/
#include <sys/param.h>
@ -213,6 +213,14 @@ union_lookup(ap)
int iswhiteout;
struct vattr va;
/*
* Disallow write attemps to the filesystem mounted read-only.
*/
if ((cnp->cn_flags & ISLASTCN) && (dvp->v_mount->mnt_flag & MNT_RDONLY) &&
(cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
return (EROFS);
#ifdef notyet
if (cnp->cn_namelen == 3 &&
cnp->cn_nameptr[2] == '.' &&
@ -261,6 +269,17 @@ union_lookup(ap)
}
uerror = union_lookup1(um->um_uppervp, &upperdvp,
&uppervp, cnp);
/*
* Disallow write attemps to the filesystem mounted read-only.
*/
if (uerror == EJUSTRETURN && (cnp->cn_flags & ISLASTCN) &&
(dvp->v_mount->mnt_flag & MNT_RDONLY) &&
(cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME)) {
if (!lockparent)
cnp->cn_flags &= ~LOCKPARENT;
return (EROFS);
}
if (cnp->cn_flags & ISDOTDOT) {
if (dun->un_uppervp == upperdvp) {
/*
@ -653,6 +672,15 @@ union_access(ap)
struct vnode *vp;
struct vnode *savedvp;
/*
* Disallow write attempts on filesystems mounted read-only.
*/
if (ap->a_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);
}
}
if ((vp = un->un_uppervp) != NULLVP) {
FIXUP(un, p);
ap->a_vp = vp;
@ -765,8 +793,18 @@ union_setattr(ap)
{
struct union_node *un = VTOUNION(ap->a_vp);
struct proc *p = ap->a_p;
struct vattr *vap = ap->a_vap;
int error;
/*
* Disallow write attempts on filesystems mounted read-only.
*/
if ((ap->a_vp->v_mount->mnt_flag & MNT_RDONLY) &&
(vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL))
return (EROFS);
/*
* Handle case of truncating lower object to zero size,
* by creating a zero length upper object. This is to

40
sys/miscfs/union/union_vnops.c
View File

@ -35,7 +35,7 @@
* SUCH DAMAGE.
*
* @(#)union_vnops.c 8.32 (Berkeley) 6/23/95
* $Id: union_vnops.c,v 1.38 1997/08/15 02:36:28 kato Exp $
* $Id: union_vnops.c,v 1.39 1997/09/02 20:06:13 bde Exp $
*/
#include <sys/param.h>
@ -213,6 +213,14 @@ union_lookup(ap)
int iswhiteout;
struct vattr va;
/*
* Disallow write attemps to the filesystem mounted read-only.
*/
if ((cnp->cn_flags & ISLASTCN) && (dvp->v_mount->mnt_flag & MNT_RDONLY) &&
(cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
return (EROFS);
#ifdef notyet
if (cnp->cn_namelen == 3 &&
cnp->cn_nameptr[2] == '.' &&
@ -261,6 +269,17 @@ union_lookup(ap)
}
uerror = union_lookup1(um->um_uppervp, &upperdvp,
&uppervp, cnp);
/*
* Disallow write attemps to the filesystem mounted read-only.
*/
if (uerror == EJUSTRETURN && (cnp->cn_flags & ISLASTCN) &&
(dvp->v_mount->mnt_flag & MNT_RDONLY) &&
(cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME)) {
if (!lockparent)
cnp->cn_flags &= ~LOCKPARENT;
return (EROFS);
}
if (cnp->cn_flags & ISDOTDOT) {
if (dun->un_uppervp == upperdvp) {
/*
@ -653,6 +672,15 @@ union_access(ap)
struct vnode *vp;
struct vnode *savedvp;
/*
* Disallow write attempts on filesystems mounted read-only.
*/
if (ap->a_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);
}
}
if ((vp = un->un_uppervp) != NULLVP) {
FIXUP(un, p);
ap->a_vp = vp;
@ -765,8 +793,18 @@ union_setattr(ap)
{
struct union_node *un = VTOUNION(ap->a_vp);
struct proc *p = ap->a_p;
struct vattr *vap = ap->a_vap;
int error;
/*
* Disallow write attempts on filesystems mounted read-only.
*/
if ((ap->a_vp->v_mount->mnt_flag & MNT_RDONLY) &&
(vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL))
return (EROFS);
/*
* Handle case of truncating lower object to zero size,
* by creating a zero length upper object. This is to