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-rw-r--r--fs/userfaultfd.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c
index 4c78458..b676575 100644
--- a/fs/userfaultfd.c
+++ b/fs/userfaultfd.c
@@ -774,6 +774,34 @@ void userfaultfd_unmap_complete(struct mm_struct *mm, struct list_head *uf)
}
}
+void userfaultfd_exit(struct mm_struct *mm)
+{
+ struct vm_area_struct *vma = mm->mmap;
+
+ /*
+ * We can do the vma walk without locking because the caller
+ * (exit_mm) knows it now has exclusive access
+ */
+ while (vma) {
+ struct userfaultfd_ctx *ctx = vma->vm_userfaultfd_ctx.ctx;
+
+ if (ctx && (ctx->features & UFFD_FEATURE_EVENT_EXIT)) {
+ struct userfaultfd_wait_queue ewq;
+
+ userfaultfd_ctx_get(ctx);
+
+ msg_init(&ewq.msg);
+ ewq.msg.event = UFFD_EVENT_EXIT;
+
+ userfaultfd_event_wait_completion(ctx, &ewq);
+
+ ctx->features &= ~UFFD_FEATURE_EVENT_EXIT;
+ }
+
+ vma = vma->vm_next;
+ }
+}
+
static int userfaultfd_release(struct inode *inode, struct file *file)
{
struct userfaultfd_ctx *ctx = file->private_data;
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