/*
* loopback block device utilities
*
- * Copyright (C) 2009-2021 Red Hat, Inc. All rights reserved.
- * Copyright (C) 2009-2021 Milan Broz
+ * Copyright (C) 2009-2023 Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2009-2023 Milan Broz
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
#include <limits.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
-#include <sys/types.h>
#ifdef HAVE_SYS_SYSMACROS_H
# include <sys/sysmacros.h> /* for major, minor */
#endif
+#include <linux/types.h>
#include <linux/loop.h>
#include "utils_loop.h"
+#include "libcryptsetup_macros.h"
#define LOOP_DEV_MAJOR 7
#define LOOP_SET_CAPACITY 0x4C07
#endif
+#ifndef LOOP_SET_BLOCK_SIZE
+#define LOOP_SET_BLOCK_SIZE 0x4C09
+#endif
+
+#ifndef LOOP_CONFIGURE
+#define LOOP_CONFIGURE 0x4C0A
+struct loop_config {
+ __u32 fd;
+ __u32 block_size;
+ struct loop_info64 info;
+ __u64 __reserved[8];
+};
+#endif
+
static char *crypt_loop_get_device_old(void)
{
- char dev[20];
+ char dev[64];
int i, loop_fd;
struct loop_info64 lo64 = {0};
}
int crypt_loop_attach(char **loop, const char *file, int offset,
- int autoclear, int *readonly)
+ int autoclear, int *readonly, size_t blocksize)
{
- struct loop_info64 lo64 = {0};
+ struct loop_config config = {0};
char *lo_file_name;
int loop_fd = -1, file_fd = -1, r = 1;
+ int fallback = 0;
*loop = NULL;
if (file_fd < 0)
goto out;
- while (loop_fd < 0) {
+ config.fd = file_fd;
+
+ lo_file_name = (char*)config.info.lo_file_name;
+ lo_file_name[LO_NAME_SIZE-1] = '\0';
+ strncpy(lo_file_name, file, LO_NAME_SIZE-1);
+ config.info.lo_offset = offset;
+ if (autoclear)
+ config.info.lo_flags |= LO_FLAGS_AUTOCLEAR;
+ if (blocksize > SECTOR_SIZE)
+ config.block_size = blocksize;
+
+ while (loop_fd < 0) {
*loop = crypt_loop_get_device();
if (!*loop)
goto out;
loop_fd = open(*loop, *readonly ? O_RDONLY : O_RDWR);
if (loop_fd < 0)
goto out;
-
- if (ioctl(loop_fd, LOOP_SET_FD, file_fd) < 0) {
+ if (ioctl(loop_fd, LOOP_CONFIGURE, &config) < 0) {
+ if (errno == EINVAL || errno == ENOTTY) {
+ free(*loop);
+ *loop = NULL;
+
+ close(loop_fd);
+ loop_fd = -1;
+
+ /* kernel doesn't support LOOP_CONFIGURE */
+ fallback = 1;
+ break;
+ }
if (errno != EBUSY)
goto out;
free(*loop);
}
}
- lo_file_name = (char*)lo64.lo_file_name;
- lo_file_name[LO_NAME_SIZE-1] = '\0';
- strncpy(lo_file_name, file, LO_NAME_SIZE-1);
- lo64.lo_offset = offset;
- if (autoclear)
- lo64.lo_flags |= LO_FLAGS_AUTOCLEAR;
+ if (fallback) {
+ while (loop_fd < 0) {
+ *loop = crypt_loop_get_device();
+ if (!*loop)
+ goto out;
- if (ioctl(loop_fd, LOOP_SET_STATUS64, &lo64) < 0) {
- (void)ioctl(loop_fd, LOOP_CLR_FD, 0);
- goto out;
+ loop_fd = open(*loop, *readonly ? O_RDONLY : O_RDWR);
+ if (loop_fd < 0)
+ goto out;
+ if (ioctl(loop_fd, LOOP_SET_FD, file_fd) < 0) {
+ if (errno != EBUSY)
+ goto out;
+ free(*loop);
+ *loop = NULL;
+
+ close(loop_fd);
+ loop_fd = -1;
+ }
+ }
+
+ if (blocksize > SECTOR_SIZE)
+ (void)ioctl(loop_fd, LOOP_SET_BLOCK_SIZE, (unsigned long)blocksize);
+
+ if (ioctl(loop_fd, LOOP_SET_STATUS64, &config.info) < 0) {
+ (void)ioctl(loop_fd, LOOP_CLR_FD, 0);
+ goto out;
+ }
}
/* Verify that autoclear is really set */
if (autoclear) {
- memset(&lo64, 0, sizeof(lo64));
- if (ioctl(loop_fd, LOOP_GET_STATUS64, &lo64) < 0 ||
- !(lo64.lo_flags & LO_FLAGS_AUTOCLEAR)) {
+ memset(&config.info, 0, sizeof(config.info));
+ if (ioctl(loop_fd, LOOP_GET_STATUS64, &config.info) < 0 ||
+ !(config.info.lo_flags & LO_FLAGS_AUTOCLEAR)) {
(void)ioctl(loop_fd, LOOP_CLR_FD, 0);
goto out;
}