/*
* Main code to turn off disk quotas for a filesystem. Does not change
* flags.
*/
static int
quotaoff1(struct thread *td, struct mount *mp, int type)
{
struct vnode *vp;
struct vnode *qvp, *mvp;
struct ufsmount *ump;
struct dquot *dq;
struct inode *ip;
struct ucred *cr;
int error;
ump = VFSTOUFS(mp);
UFS_LOCK(ump);
KASSERT((ump->um_qflags[type] & QTF_CLOSING) != 0,
("quotaoff1: flags are invalid"));
if ((qvp = ump->um_quotas[type]) == NULLVP) {
UFS_UNLOCK(ump);
return (0);
}
cr = ump->um_cred[type];
UFS_UNLOCK(ump);
/*
* Search vnodes associated with this mount point,
* deleting any references to quota file being closed.
*/
again:
MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
if (vp->v_type == VNON) {
VI_UNLOCK(vp);
continue;
}
if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) {
MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
goto again;
}
ip = VTOI(vp);
dq = ip->i_dquot[type];
ip->i_dquot[type] = NODQUOT;
dqrele(vp, dq);
VOP_UNLOCK(vp, 0);
vrele(vp);
}
error = dqflush(qvp);
if (error != 0)
return (error);
/*
* Clear um_quotas before closing the quota vnode to prevent
* access to the closed vnode from dqget/dqsync
*/
UFS_LOCK(ump);
ump->um_quotas[type] = NULLVP;
ump->um_cred[type] = NOCRED;
UFS_UNLOCK(ump);
vn_lock(qvp, LK_EXCLUSIVE | LK_RETRY);
qvp->v_vflag &= ~VV_SYSTEM;
VOP_UNLOCK(qvp, 0);
error = vn_close(qvp, FREAD|FWRITE, td->td_ucred, td);
crfree(cr);
return (error);
}
/*
* Q_QUOTAOFF - turn off disk quotas for a filesystem.
*/
int
quotaoff(struct lwp *l, struct mount *mp, int type)
{
struct vnode *vp;
struct vnode *qvp, *mvp;
struct ufsmount *ump = VFSTOUFS(mp);
struct dquot *dq;
struct inode *ip;
kauth_cred_t cred;
int i, error;
/* Allocate a marker vnode. */
if ((mvp = vnalloc(mp)) == NULL)
return ENOMEM;
mutex_enter(&dqlock);
while ((ump->um_qflags[type] & (QTF_CLOSING | QTF_OPENING)) != 0)
cv_wait(&dqcv, &dqlock);
if ((qvp = ump->um_quotas[type]) == NULLVP) {
mutex_exit(&dqlock);
vnfree(mvp);
return (0);
}
ump->um_qflags[type] |= QTF_CLOSING;
mutex_exit(&dqlock);
/*
* Search vnodes associated with this mount point,
* deleting any references to quota file being closed.
*/
mutex_enter(&mntvnode_lock);
again:
for (vp = TAILQ_FIRST(&mp->mnt_vnodelist); vp; vp = vunmark(mvp)) {
vmark(mvp, vp);
mutex_enter(&vp->v_interlock);
if (VTOI(vp) == NULL || vp->v_mount != mp || vismarker(vp) ||
vp->v_type == VNON ||
(vp->v_iflag & (VI_XLOCK | VI_CLEAN)) != 0) {
mutex_exit(&vp->v_interlock);
continue;
}
mutex_exit(&mntvnode_lock);
if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK)) {
mutex_enter(&mntvnode_lock);
(void)vunmark(mvp);
goto again;
}
ip = VTOI(vp);
dq = ip->i_dquot[type];
ip->i_dquot[type] = NODQUOT;
dqrele(vp, dq);
vput(vp);
mutex_enter(&mntvnode_lock);
}
mutex_exit(&mntvnode_lock);
#ifdef DIAGNOSTIC
dqflush(qvp);
#endif
qvp->v_vflag &= ~VV_SYSTEM;
error = vn_close(qvp, FREAD|FWRITE, l->l_cred);
mutex_enter(&dqlock);
ump->um_quotas[type] = NULLVP;
cred = ump->um_cred[type];
ump->um_cred[type] = NOCRED;
for (i = 0; i < MAXQUOTAS; i++)
if (ump->um_quotas[i] != NULLVP)
break;
ump->um_qflags[type] &= ~QTF_CLOSING;
cv_broadcast(&dqcv);
mutex_exit(&dqlock);
kauth_cred_free(cred);
if (i == MAXQUOTAS)
mp->mnt_flag &= ~MNT_QUOTA;
return (error);
}
