virt/kvm/guest_memfd.c

171 static long kvm_gmem_fallocate(struct file *file, int mode, loff_t offset,
186 		ret = kvm_gmem_punch_hole(file_inode(file), offset, len);
188 		ret = kvm_gmem_allocate(file_inode(file), offset, len);
191 		file_modified(file);
195 static int kvm_gmem_release(struct inode *inode, struct file *file)
197 	struct kvm_gmem *gmem = file->private_data;
204 	 * reference to the file and thus no new bindings can be created, but
214 		rcu_assign_pointer(slot->gmem.file, NULL);
220 	 * Zap all SPTEs pointed at by this file.  Do not free the backing
221 	 * memory, as its lifetime is associated with the inode, not the file.
240 static inline struct file *kvm_gmem_get_file(struct kvm_memory_slot *slot)
243 	 * Do not return slot->gmem.file if it has already been closed;
245 	 * kvm_gmem_release() clears slot->gmem.file, and you do not
248 	return get_file_active(&slot->gmem.file);
332 	struct file *file;
345 	file = anon_inode_create_getfile(anon_name, &kvm_gmem_fops, gmem,
347 	if (IS_ERR(file)) {
348 		err = PTR_ERR(file);
352 	file->f_flags |= O_LARGEFILE;
354 	inode = file->f_inode;
355 	WARN_ON(file->f_mapping != inode->i_mapping);
372 	fd_install(fd, file);
404 	struct file *file;
409 	file = fget(fd);
410 	if (!file)
413 	if (file->f_op != &kvm_gmem_fops)
416 	gmem = file->private_data;
420 	inode = file_inode(file);
439 	 * be see either a NULL file or this new file, no need for them to go
442 	rcu_assign_pointer(slot->gmem.file, file);
449 	 * Drop the reference to the file, even on success.  The file pins KVM,
451 	 * file is closed before memslots are destroyed.
455 	fput(file);
464 	struct file *file;
467 	 * Nothing to do if the underlying file was already closed (or is being
470 	file = kvm_gmem_get_file(slot);
471 	if (!file)
474 	gmem = file->private_data;
476 	filemap_invalidate_lock(file->f_mapping);
478 	rcu_assign_pointer(slot->gmem.file, NULL);
480 	filemap_invalidate_unlock(file->f_mapping);
482 	fput(file);
492 	struct file *file;
495 	file = kvm_gmem_get_file(slot);
496 	if (!file)
499 	gmem = file->private_data;
506 	folio = kvm_gmem_get_folio(file_inode(file), index);
528 	fput(file);