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userfaultfd: non-cooperative: add event for exit() notification

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Allow userfaultfd monitor track termination of the processes that have
memory backed by the uffd.

[[email protected]: add comment]
  Link: http://lkml.kernel.org/r/20170202135448.GB19804@rapoport-lnxLink: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Mike Rapoport <[email protected]>
Acked-by: Hillf Danton <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Cc: "Dr. David Alan Gilbert" <[email protected]>
Cc: Mike Kravetz <[email protected]>
Cc: Pavel Emelyanov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Mike Rapoport 2017-02-24 14:58:25 -08:00 • committed by Linus Torvalds
commit ca49ca7114
4 changed files with 41 additions and 1 deletions
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28
fs/userfaultfd.c
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@ -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;