/*
* VOP_RECLAIM
*
* Reclaim should make an effort to returning errors other than EBUSY.
*/
static
int
emufs_reclaim(struct vnode *v)
{
struct emufs_vnode *ev = v->vn_data;
struct emufs_fs *ef = v->vn_fs->fs_data;
unsigned ix, i, num;
int result;
/*
* Need both of these locks, e_lock to protect the device
* and vfs_biglock to protect the fs-related material.
*/
vfs_biglock_acquire();
lock_acquire(ef->ef_emu->e_lock);
if (ev->ev_v.vn_refcount != 1) {
lock_release(ef->ef_emu->e_lock);
vfs_biglock_release();
return EBUSY;
}
/* emu_close retries on I/O error */
result = emu_close(ev->ev_emu, ev->ev_handle);
if (result) {
lock_release(ef->ef_emu->e_lock);
vfs_biglock_release();
return result;
}
num = vnodearray_num(ef->ef_vnodes);
ix = num;
for (i=0; i<num; i++) {
struct vnode *vx;
vx = vnodearray_get(ef->ef_vnodes, i);
if (vx == v) {
ix = i;
break;
}
}
if (ix == num) {
panic("emu%d: reclaim vnode %u not in vnode pool\n",
ef->ef_emu->e_unit, ev->ev_handle);
}
vnodearray_remove(ef->ef_vnodes, ix);
VOP_CLEANUP(&ev->ev_v);
lock_release(ef->ef_emu->e_lock);
vfs_biglock_release();
kfree(ev);
return 0;
}
/*
* Reclaim - drop a vnode that's no longer in use.
*/
static
int
semfs_reclaim(struct vnode *vn)
{
struct semfs_vnode *semv = vn->vn_data;
struct semfs *semfs = semv->semv_semfs;
struct vnode *vn2;
struct semfs_sem *sem;
unsigned i, num;
lock_acquire(semfs->semfs_tablelock);
/* vnode refcount is protected by the vnode's ->vn_countlock */
spinlock_acquire(&vn->vn_countlock);
if (vn->vn_refcount > 1) {
/* consume the reference VOP_DECREF passed us */
vn->vn_refcount--;
spinlock_release(&vn->vn_countlock);
lock_release(semfs->semfs_tablelock);
return EBUSY;
}
spinlock_release(&vn->vn_countlock);
/* remove from the table */
num = vnodearray_num(semfs->semfs_vnodes);
for (i=0; i<num; i++) {
vn2 = vnodearray_get(semfs->semfs_vnodes, i);
if (vn2 == vn) {
vnodearray_remove(semfs->semfs_vnodes, i);
break;
}
}
if (semv->semv_semnum != SEMFS_ROOTDIR) {
sem = semfs_semarray_get(semfs->semfs_sems, semv->semv_semnum);
KASSERT(sem->sems_hasvnode);
sem->sems_hasvnode = false;
if (sem->sems_linked == false) {
semfs_semarray_set(semfs->semfs_sems,
semv->semv_semnum, NULL);
semfs_sem_destroy(sem);
}
}
/* done with the table */
lock_release(semfs->semfs_tablelock);
/* destroy it */
semfs_vnode_destroy(semv);
return 0;
}
/*
* Called when the vnode refcount (in-memory usage count) hits zero.
*
* This function should try to avoid returning errors other than EBUSY.
*/
static
int
sfs_reclaim(struct vnode *v)
{
struct sfs_vnode *sv = v->vn_data;
struct sfs_fs *sfs = v->vn_fs->fs_data;
unsigned ix, i, num;
int result;
vfs_biglock_acquire();
/*
* Make sure someone else hasn't picked up the vnode since the
* decision was made to reclaim it. (You must also synchronize
* this with sfs_loadvnode.)
*/
if (v->vn_refcount != 1) {
/* consume the reference VOP_DECREF gave us */
KASSERT(v->vn_refcount>1);
v->vn_refcount--;
vfs_biglock_release();
return EBUSY;
}
/* If there are no on-disk references to the file either, erase it. */
if (sv->sv_i.sfi_linkcount==0) {
result = VOP_TRUNCATE(&sv->sv_v, 0);
if (result) {
vfs_biglock_release();
return result;
}
}
/* Sync the inode to disk */
result = sfs_sync_inode(sv);
if (result) {
vfs_biglock_release();
return result;
}
/* If there are no on-disk references, discard the inode */
if (sv->sv_i.sfi_linkcount==0) {
sfs_bfree(sfs, sv->sv_ino);
}
/* Remove the vnode structure from the table in the struct sfs_fs. */
num = vnodearray_num(sfs->sfs_vnodes);
ix = num;
for (i=0; i<num; i++) {
struct vnode *v2 = vnodearray_get(sfs->sfs_vnodes, i);
struct sfs_vnode *sv2 = v2->vn_data;
if (sv2 == sv) {
ix = i;
break;
}
}
if (ix == num) {
panic("sfs: reclaim vnode %u not in vnode pool\n",
sv->sv_ino);
}
vnodearray_remove(sfs->sfs_vnodes, ix);
VOP_CLEANUP(&sv->sv_v);
vfs_biglock_release();
/* Release the storage for the vnode structure itself. */
kfree(sv);
/* Done */
return 0;
}
/*
* VOP_RECLAIM
*
* Reclaim should make an effort to returning errors other than EBUSY.
*/
static
int
emufs_reclaim(struct vnode *v)
{
struct emufs_vnode *ev = v->vn_data;
struct emufs_fs *ef = v->vn_fs->fs_data;
unsigned ix, i, num;
int result;
/*
* Need both of these locks: e_lock to protect the device,
* and vn_countlock for the reference count.
*/
lock_acquire(ef->ef_emu->e_lock);
spinlock_acquire(&ev->ev_v.vn_countlock);
if (ev->ev_v.vn_refcount > 1) {
/* consume the reference VOP_DECREF passed us */
ev->ev_v.vn_refcount--;
spinlock_release(&ev->ev_v.vn_countlock);
lock_release(ef->ef_emu->e_lock);
return EBUSY;
}
KASSERT(ev->ev_v.vn_refcount == 1);
/*
* Since we hold e_lock and are the last ref, nobody can increment
* the refcount, so we can release vn_countlock.
*/
spinlock_release(&ev->ev_v.vn_countlock);
/* emu_close retries on I/O error */
result = emu_close(ev->ev_emu, ev->ev_handle);
if (result) {
lock_release(ef->ef_emu->e_lock);
return result;
}
num = vnodearray_num(ef->ef_vnodes);
ix = num;
for (i=0; i<num; i++) {
struct vnode *vx;
vx = vnodearray_get(ef->ef_vnodes, i);
if (vx == v) {
ix = i;
break;
}
}
if (ix == num) {
panic("emu%d: reclaim vnode %u not in vnode pool\n",
ef->ef_emu->e_unit, ev->ev_handle);
}
vnodearray_remove(ef->ef_vnodes, ix);
vnode_cleanup(&ev->ev_v);
lock_release(ef->ef_emu->e_lock);
kfree(ev);
return 0;
}
