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提交 a3649f33 创建 作者: Nickolai Zeldovich's avatar Nickolai Zeldovich
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constify vma::n

上级 35a7a560
隐藏空白字符变更
内嵌 并排
正在显示 包含 19 行增加 和 22 行删除
include/vm.hh
浏览文件 @ a3649f33
......@@ -36,11 +36,11 @@ struct vma : public range {
const uptr vma_start; // start of mapping
const uptr vma_end; // one past the last byte
const enum vmatype va_type;
struct vmnode *n;
struct vmnode * const n;
struct spinlock lock; // serialize fault/unmap
char lockname[16];
vma(vmap *vmap, uptr start, uptr end, enum vmatype vtype);
vma(vmap *vmap, uptr start, uptr end, enum vmatype vtype, vmnode *vmn);
~vma();
virtual void do_gc() { delete this; }
......
kernel/vm.cc
浏览文件 @ a3649f33
......@@ -119,17 +119,19 @@ vmnode::load(inode *iparg, u64 offarg, u64 szarg)
* vma
*/
vma::vma(vmap *vmap, uptr start, uptr end, enum vmatype vtype)
vma::vma(vmap *vmap, uptr start, uptr end, enum vmatype vtype, vmnode *vmn)
: range(&vmap->cr, start, end-start),
vma_start(start), vma_end(end), va_type(vtype), n(0)
vma_start(start), vma_end(end), va_type(vtype), n(vmn)
{
if (n)
n->ref++;
snprintf(lockname, sizeof(lockname), "vma:%p", this);
initlock(&lock, lockname, LOCKSTAT_VM);
}
vma::~vma()
{
if(n)
if (n)
n->decref();
destroylock(&lock);
}
......@@ -215,19 +217,14 @@ vmap::copy(int share)
vma *e = (vma *) r;
scoped_acquire sae(&e->lock);
struct vma *ne = new vma(nm, e->vma_start, e->vma_end, share ? COW : PRIVATE);
if (ne == 0)
goto err;
struct vma *ne;
if (share) {
ne->n = e->n;
ne = new vma(nm, e->vma_start, e->vma_end, COW, e->n);
// if the original vma wasn't COW, replace it with a COW vma
if (e->va_type != COW) {
vma *repl = new vma(this, e->vma_start, e->vma_end, COW);
repl->n = e->n;
repl->n->ref++;
vma *repl = new vma(this, e->vma_start, e->vma_end, COW, e->n);
replace_vma(e, repl);
updatepages(pml4, e->vma_start, e->vma_end, [](atomic<pme_t>* p) {
for (;;) {
......@@ -241,13 +238,17 @@ vmap::copy(int share)
});
}
} else {
ne->n = e->n->copy();
ne = new vma(nm, e->vma_start, e->vma_end, PRIVATE, e->n->copy());
}
if (ne->n == 0)
if (ne == 0)
goto err;
ne->n->ref++;
if (ne->n == 0) {
delete ne;
goto err;
}
auto span = nm->cr.search_lock(ne->vma_start, ne->vma_end - ne->vma_start);
for (auto x __attribute__((unused)): span)
assert(0); /* span must be empty */
......@@ -307,14 +308,12 @@ vmap::insert(vmnode *n, uptr vma_start)
// XXX handle overlaps
e = new vma(this, vma_start, vma_start+len, PRIVATE);
e = new vma(this, vma_start, vma_start+len, PRIVATE, n);
if (e == 0) {
cprintf("vmap::insert: out of vmas\n");
return -1;
}
e->n = n;
n->ref++;
span.replace(e);
}
......@@ -396,9 +395,7 @@ vmap::pagefault_wcow(vma *m)
return -1;
}
vma *repl = new vma(this, m->vma_start, m->vma_end, PRIVATE);
repl->n = nodecopy;
nodecopy->ref = 1;
vma *repl = new vma(this, m->vma_start, m->vma_end, PRIVATE, nodecopy);
replace_vma(m, repl);
updatepages(pml4, m->vma_start, m->vma_end, [](atomic<pme_t> *p) {
......
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