Call swap_pager_freespace() from vm_object_page_remove().
All vm_object_page_remove() callers, except linux_invalidate_mapping_pages() in the LinuxKPI, free swap space when removing a range of pages from an object. The LinuxKPI case appears to be an unintentional omission that could result in leaked swap blocks, so unconditionally free swap space in vm_object_page_remove() to protect against similar bugs in the future. Reviewed by: alc, kib Tested by: pho Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D25329
This commit is contained in:
parent
0a1016f9e8
commit
84242cf68a
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=362613
@ -1566,8 +1566,6 @@ mdresize(struct md_s *sc, struct md_req *mdr)
|
||||
if (newpages < oldpages) {
|
||||
VM_OBJECT_WLOCK(sc->object);
|
||||
vm_object_page_remove(sc->object, newpages, 0, 0);
|
||||
swap_pager_freespace(sc->object, newpages,
|
||||
oldpages - newpages);
|
||||
swap_release_by_cred(IDX_TO_OFF(oldpages -
|
||||
newpages), sc->cred);
|
||||
sc->object->charge = IDX_TO_OFF(newpages);
|
||||
|
@ -1517,12 +1517,9 @@ tmpfs_reg_resize(struct vnode *vp, off_t newsize, boolean_t ignerr)
|
||||
/*
|
||||
* Release any swap space and free any whole pages.
|
||||
*/
|
||||
if (newpages < oldpages) {
|
||||
swap_pager_freespace(uobj, newpages, oldpages -
|
||||
newpages);
|
||||
if (newpages < oldpages)
|
||||
vm_object_page_remove(uobj, newpages, 0, 0);
|
||||
}
|
||||
}
|
||||
uobj->size = newpages;
|
||||
VM_OBJECT_WUNLOCK(uobj);
|
||||
|
||||
|
@ -540,15 +540,10 @@ shm_dotruncate_locked(struct shmfd *shmfd, off_t length, void *rl_cookie)
|
||||
}
|
||||
delta = IDX_TO_OFF(object->size - nobjsize);
|
||||
|
||||
/* Toss in memory pages. */
|
||||
if (nobjsize < object->size)
|
||||
vm_object_page_remove(object, nobjsize, object->size,
|
||||
0);
|
||||
|
||||
/* Toss pages from swap. */
|
||||
if (object->type == OBJT_SWAP)
|
||||
swap_pager_freespace(object, nobjsize, delta);
|
||||
|
||||
/* Free the swap accounted for shm */
|
||||
swap_release_by_cred(delta, object->cred);
|
||||
object->charge -= delta;
|
||||
|
@ -3644,7 +3644,7 @@ static void
|
||||
vm_map_entry_delete(vm_map_t map, vm_map_entry_t entry)
|
||||
{
|
||||
vm_object_t object;
|
||||
vm_pindex_t offidxstart, offidxend, count, size1;
|
||||
vm_pindex_t offidxstart, offidxend, size1;
|
||||
vm_size_t size;
|
||||
|
||||
vm_map_entry_unlink(map, entry, UNLINK_MERGE_NONE);
|
||||
@ -3673,9 +3673,8 @@ vm_map_entry_delete(vm_map_t map, vm_map_entry_t entry)
|
||||
KASSERT(entry->cred == NULL || object->cred == NULL ||
|
||||
(entry->eflags & MAP_ENTRY_NEEDS_COPY),
|
||||
("OVERCOMMIT vm_map_entry_delete: both cred %p", entry));
|
||||
count = atop(size);
|
||||
offidxstart = OFF_TO_IDX(entry->offset);
|
||||
offidxend = offidxstart + count;
|
||||
offidxend = offidxstart + atop(size);
|
||||
VM_OBJECT_WLOCK(object);
|
||||
if (object->ref_count != 1 &&
|
||||
((object->flags & OBJ_ONEMAPPING) != 0 ||
|
||||
@ -3690,9 +3689,6 @@ vm_map_entry_delete(vm_map_t map, vm_map_entry_t entry)
|
||||
*/
|
||||
vm_object_page_remove(object, offidxstart, offidxend,
|
||||
OBJPR_NOTMAPPED);
|
||||
if (object->type == OBJT_SWAP)
|
||||
swap_pager_freespace(object, offidxstart,
|
||||
count);
|
||||
if (offidxend >= object->size &&
|
||||
offidxstart < object->size) {
|
||||
size1 = object->size;
|
||||
|
@ -2121,6 +2121,12 @@ vm_object_page_remove(vm_object_t object, vm_pindex_t start, vm_pindex_t end,
|
||||
vm_page_free(p);
|
||||
}
|
||||
vm_object_pip_wakeup(object);
|
||||
|
||||
if (object->type == OBJT_SWAP) {
|
||||
if (end == 0)
|
||||
end = object->size;
|
||||
swap_pager_freespace(object, start, end - start);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
@ -2288,9 +2294,6 @@ vm_object_coalesce(vm_object_t prev_object, vm_ooffset_t prev_offset,
|
||||
if (next_pindex < prev_object->size) {
|
||||
vm_object_page_remove(prev_object, next_pindex, next_pindex +
|
||||
next_size, 0);
|
||||
if (prev_object->type == OBJT_SWAP)
|
||||
swap_pager_freespace(prev_object,
|
||||
next_pindex, next_size);
|
||||
#if 0
|
||||
if (prev_object->cred != NULL) {
|
||||
KASSERT(prev_object->charge >=
|
||||
|
Loading…
Reference in New Issue
Block a user