25 	struct file_handle *handle = NULL;  in do_sys_name_to_handle()  local
29 	 * the file handle if decodeable file handle was requested.  in do_sys_name_to_handle()
35 	 * A request to encode a connectable handle for a disconnected dentry  in do_sys_name_to_handle()
48 	handle = kzalloc(struct_size(handle, f_handle, f_handle.handle_bytes),  in do_sys_name_to_handle()
50 	if (!handle)  in do_sys_name_to_handle()
53 	/* convert handle size to multiple of sizeof(u32) */  in do_sys_name_to_handle()
56 	/* Encode a possibly decodeable/connectable file handle */  in do_sys_name_to_handle()
58 				    (struct fid *)handle->f_handle,  in do_sys_name_to_handle()
60 	handle->handle_type = retval;  in do_sys_name_to_handle()
61 	/* convert handle size to bytes */  in do_sys_name_to_handle()
63 	handle->handle_bytes = handle_bytes;  in do_sys_name_to_handle()
64 	if ((handle->handle_bytes > f_handle.handle_bytes) ||  in do_sys_name_to_handle()
68 		 * But file system returned 255 always. So handle  in do_sys_name_to_handle()
74 		 * set the handle size to zero so we copy only  in do_sys_name_to_handle()
80 		 * When asked to encode a connectable file handle, encode this  in do_sys_name_to_handle()
81 		 * property in the file handle itself, so that we later know  in do_sys_name_to_handle()
83 		 * For sanity, also encode in the file handle if the encoded  in do_sys_name_to_handle()
89 			handle->handle_type |= FILEID_IS_CONNECTABLE;  in do_sys_name_to_handle()
105 	/* copy the handle */  in do_sys_name_to_handle()
107 		copy_to_user(ufh, handle,  in do_sys_name_to_handle()
108 			     struct_size(handle, f_handle, handle_bytes)))  in do_sys_name_to_handle()
110 	kfree(handle);  in do_sys_name_to_handle()
115  * sys_name_to_handle_at: convert name to handle
117  * @name: name that should be converted to handle.
118  * @handle: resulting file handle
122  *        and whether a decodable file handle is required.
124  * @handle->handle_size indicate the space available to store the
125  * variable part of the file handle in bytes. If there is not
130 		struct file_handle __user *, handle, void __user *, mnt_id,  in SYSCALL_DEFINE5()
143 	 * AT_HANDLE_FID means there is no intention to decode file handle  in SYSCALL_DEFINE5()
148 	 * connectable file handle, because its parent is unknown.  in SYSCALL_DEFINE5()
163 		err = do_sys_name_to_handle(&path, handle, mnt_id,  in SYSCALL_DEFINE5()
248 static int do_handle_to_path(struct file_handle *handle, struct path *path,  in do_handle_to_path()  argument
255 	/* change the handle size to multiple of sizeof(u32) */  in do_handle_to_path()
256 	handle_dwords = handle->handle_bytes >> 2;  in do_handle_to_path()
257 	dentry = exportfs_decode_fh_raw(mnt, (struct fid *)handle->f_handle,  in do_handle_to_path()
258 					handle_dwords, handle->handle_type,  in do_handle_to_path()
285 	 * way to the encoded file handle. If the caller is only able to  in may_decode_fh()
326 	struct file_handle *handle = NULL;  in handle_to_path()  local
357 	handle = kmalloc(struct_size(handle, f_handle, f_handle.handle_bytes),  in handle_to_path()
359 	if (!handle) {  in handle_to_path()
363 	/* copy the full handle */  in handle_to_path()
364 	*handle = f_handle;  in handle_to_path()
365 	if (copy_from_user(&handle->f_handle,  in handle_to_path()
373 	 * If handle was encoded with AT_HANDLE_CONNECTABLE, verify that we  in handle_to_path()
384 	handle->handle_type &= ~FILEID_USER_FLAGS_MASK;  in handle_to_path()
385 	retval = do_handle_to_path(handle, path, &ctx);  in handle_to_path()
388 	kfree(handle);  in handle_to_path()
424  * sys_open_by_handle_at: Open the file handle
426  * @handle: file handle to be opened
430  * of the mount point. file handle is decoded relative
435 		struct file_handle __user *, handle,  in SYSCALL_DEFINE3()
443 	ret = do_handle_open(mountdirfd, handle, flags);  in SYSCALL_DEFINE3()
453 			     struct file_handle __user *, handle, int, flags)  in COMPAT_SYSCALL_DEFINE3()
455 	return do_handle_open(mountdirfd, handle, flags);  in COMPAT_SYSCALL_DEFINE3()