diff options
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/userfaultfd.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c index 27978f249016..68f978beefac 100644 --- a/fs/userfaultfd.c +++ b/fs/userfaultfd.c @@ -596,6 +596,43 @@ void dup_userfaultfd_complete(struct list_head *fcs) } } +void mremap_userfaultfd_prep(struct vm_area_struct *vma, + struct vm_userfaultfd_ctx *vm_ctx) +{ + struct userfaultfd_ctx *ctx; + + ctx = vma->vm_userfaultfd_ctx.ctx; + if (ctx && (ctx->features & UFFD_FEATURE_EVENT_REMAP)) { + vm_ctx->ctx = ctx; + userfaultfd_ctx_get(ctx); + } +} + +void mremap_userfaultfd_complete(struct vm_userfaultfd_ctx vm_ctx, + unsigned long from, unsigned long to, + unsigned long len) +{ + struct userfaultfd_ctx *ctx = vm_ctx.ctx; + struct userfaultfd_wait_queue ewq; + + if (!ctx) + return; + + if (to & ~PAGE_MASK) { + userfaultfd_ctx_put(ctx); + return; + } + + msg_init(&ewq.msg); + + ewq.msg.event = UFFD_EVENT_REMAP; + ewq.msg.arg.remap.from = from; + ewq.msg.arg.remap.to = to; + ewq.msg.arg.remap.len = len; + + userfaultfd_event_wait_completion(ctx, &ewq); +} + static int userfaultfd_release(struct inode *inode, struct file *file) { struct userfaultfd_ctx *ctx = file->private_data; |