/*
* Sync quota file for given vnode to disk.
*/
int
qsyncvp(struct vnode *vp)
{
struct ufsmount *ump = VFSTOUFS(vp->v_mount);
struct dquot *dq;
int i;
/*
* Check if the mount point has any quotas.
* If not, simply return.
*/
for (i = 0; i < MAXQUOTAS; i++)
if (ump->um_quotas[i] != NULLVP)
break;
if (i == MAXQUOTAS)
return (0);
/*
* Search quotas associated with this vnode
* synchronizing any modified dquot structures.
*/
for (i = 0; i < MAXQUOTAS; i++) {
dq = VTOI(vp)->i_dquot[i];
if (dq != NODQUOT)
dqsync(vp, dq);
}
return (0);
}
/*
* Release a reference to a dquot.
*/
static void
dqrele(struct vnode *vp, struct dquot *dq)
{
if (dq == NODQUOT)
return;
mutex_enter(&dq->dq_interlock);
for (;;) {
mutex_enter(&dqlock);
if (dq->dq_cnt > 1) {
dq->dq_cnt--;
mutex_exit(&dqlock);
mutex_exit(&dq->dq_interlock);
return;
}
if ((dq->dq_flags & DQ_MOD) == 0)
break;
mutex_exit(&dqlock);
(void) dqsync(vp, dq);
}
KASSERT(dq->dq_cnt == 1 && (dq->dq_flags & DQ_MOD) == 0);
LIST_REMOVE(dq, dq_hash);
mutex_exit(&dqlock);
mutex_exit(&dq->dq_interlock);
mutex_destroy(&dq->dq_interlock);
pool_cache_put(dquot_cache, dq);
}
/*
* Q_SYNC - sync quota files to disk.
*/
int
qsync(struct mount *mp)
{
struct ufsmount *ump = VFSTOUFS(mp);
struct thread *td = curthread; /* XXX */
struct vnode *vp, *mvp;
struct dquot *dq;
int i, error;
/*
* Check if the mount point has any quotas.
* If not, simply return.
*/
UFS_LOCK(ump);
for (i = 0; i < MAXQUOTAS; i++)
if (ump->um_quotas[i] != NULLVP)
break;
UFS_UNLOCK(ump);
if (i == MAXQUOTAS)
return (0);
/*
* Search vnodes associated with this mount point,
* synchronizing any modified dquot structures.
*/
again:
MNT_VNODE_FOREACH_ACTIVE(vp, mp, mvp) {
if (vp->v_type == VNON) {
VI_UNLOCK(vp);
continue;
}
error = vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td);
if (error) {
if (error == ENOENT) {
MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
goto again;
}
continue;
}
for (i = 0; i < MAXQUOTAS; i++) {
dq = VTOI(vp)->i_dquot[i];
if (dq != NODQUOT)
dqsync(vp, dq);
}
vput(vp);
}
return (0);
}
/*
* Release a reference to a dquot.
*/
void
dqrele(struct vnode *vp, struct dquot *dq)
{
if (dq == NODQUOT)
return;
DQH_LOCK();
KASSERT(dq->dq_cnt > 0, ("Lost dq %p reference 1", dq));
if (dq->dq_cnt > 1) {
dq->dq_cnt--;
DQH_UNLOCK();
return;
}
DQH_UNLOCK();
sync:
(void) dqsync(vp, dq);
DQH_LOCK();
KASSERT(dq->dq_cnt > 0, ("Lost dq %p reference 2", dq));
if (--dq->dq_cnt > 0)
{
DQH_UNLOCK();
return;
}
/*
* The dq may become dirty after it is synced but before it is
* put to the free list. Checking the DQ_MOD there without
* locking dq should be safe since no other references to the
* dq exist.
*/
if ((dq->dq_flags & DQ_MOD) != 0) {
dq->dq_cnt++;
DQH_UNLOCK();
goto sync;
}
TAILQ_INSERT_TAIL(&dqfreelist, dq, dq_freelist);
DQH_UNLOCK();
}
/*
* Q_SYNC - sync quota files to disk.
*/
int
qsync(struct mount *mp)
{
struct ufsmount *ump = VFSTOUFS(mp);
struct vnode *vp, *mvp;
struct dquot *dq;
int i, error;
/*
* Check if the mount point has any quotas.
* If not, simply return.
*/
for (i = 0; i < MAXQUOTAS; i++)
if (ump->um_quotas[i] != NULLVP)
break;
if (i == MAXQUOTAS)
return (0);
/* Allocate a marker vnode. */
if ((mvp = vnalloc(mp)) == NULL)
return (ENOMEM);
/*
* Search vnodes associated with this mount point,
* synchronizing any modified dquot structures.
*/
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);
error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK);
if (error) {
mutex_enter(&mntvnode_lock);
if (error == ENOENT) {
(void)vunmark(mvp);
goto again;
}
continue;
}
for (i = 0; i < MAXQUOTAS; i++) {
dq = VTOI(vp)->i_dquot[i];
if (dq == NODQUOT)
continue;
mutex_enter(&dq->dq_interlock);
if (dq->dq_flags & DQ_MOD)
dqsync(vp, dq);
mutex_exit(&dq->dq_interlock);
}
vput(vp);
mutex_enter(&mntvnode_lock);
}
mutex_exit(&mntvnode_lock);
vnfree(mvp);
return (0);
}
