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/*
* Copyright (c) 2012 The Chromium OS Authors.
* Copyright (c) 2012-2021 The strace developers.
* Written by Mike Frysinger <vapier@gentoo.org>.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#include "defs.h"
#include DEF_MPERS_TYPE(struct_loop_info)
#include <linux/loop.h>
typedef struct loop_info struct_loop_info;
#include MPERS_DEFS
#include "xlat/loop_flags_options.h"
#include "xlat/loop_crypt_type_options.h"
static void
decode_loop_info(struct tcb *const tcp, const kernel_ulong_t addr)
{
struct_loop_info info;
if (umove_or_printaddr(tcp, addr, &info))
return;
tprint_struct_begin();
PRINT_FIELD_D(info, lo_number);
if (!abbrev(tcp)) {
tprint_struct_next();
PRINT_FIELD_DEV(info, lo_device);
tprint_struct_next();
PRINT_FIELD_U(info, lo_inode);
tprint_struct_next();
PRINT_FIELD_DEV(info, lo_rdevice);
}
tprint_struct_next();
PRINT_FIELD_X(info, lo_offset);
if (!abbrev(tcp) || info.lo_encrypt_type != LO_CRYPT_NONE) {
tprint_struct_next();
PRINT_FIELD_XVAL(info, lo_encrypt_type,
loop_crypt_type_options, "LO_CRYPT_???");
/*
* It is converted to unsigned before use in the kernel,
* see loop_info64_from_old in drivers/block/loop.c
*/
tprint_struct_next();
PRINT_FIELD_U(info, lo_encrypt_key_size);
}
tprint_struct_next();
PRINT_FIELD_FLAGS(info, lo_flags, loop_flags_options, "LO_FLAGS_???");
tprint_struct_next();
PRINT_FIELD_CSTRING(info, lo_name);
if (!abbrev(tcp) || info.lo_encrypt_type != LO_CRYPT_NONE) {
const unsigned int lo_encrypt_key_size =
MIN((unsigned) info.lo_encrypt_key_size, LO_KEY_SIZE);
tprint_struct_next();
PRINT_FIELD_STRING(info, lo_encrypt_key,
lo_encrypt_key_size, 0);
}
if (!abbrev(tcp)) {
tprint_struct_next();
PRINT_FIELD_X_ARRAY(info, lo_init);
tprint_struct_next();
PRINT_FIELD_X_ARRAY(info, reserved);
} else {
tprint_struct_next();
tprint_more_data_follows();
}
tprint_struct_end();
}
static void
print_loop_info64(struct tcb *const tcp, const struct loop_info64 *const info64)
{
if (!abbrev(tcp)) {
tprint_struct_begin();
PRINT_FIELD_DEV(*info64, lo_device);
tprint_struct_next();
PRINT_FIELD_U(*info64, lo_inode);
tprint_struct_next();
PRINT_FIELD_DEV(*info64, lo_rdevice);
tprint_struct_next();
PRINT_FIELD_X(*info64, lo_offset);
tprint_struct_next();
PRINT_FIELD_U(*info64, lo_sizelimit);
tprint_struct_next();
PRINT_FIELD_U(*info64, lo_number);
} else {
tprint_struct_begin();
PRINT_FIELD_X(*info64, lo_offset);
tprint_struct_next();
PRINT_FIELD_U(*info64, lo_number);
}
if (!abbrev(tcp) || info64->lo_encrypt_type != LO_CRYPT_NONE) {
tprint_struct_next();
PRINT_FIELD_XVAL(*info64, lo_encrypt_type,
loop_crypt_type_options, "LO_CRYPT_???");
tprint_struct_next();
PRINT_FIELD_U(*info64, lo_encrypt_key_size);
}
tprint_struct_next();
PRINT_FIELD_FLAGS(*info64, lo_flags, loop_flags_options, "LO_FLAGS_???");
tprint_struct_next();
PRINT_FIELD_CSTRING(*info64, lo_file_name);
if (!abbrev(tcp) || info64->lo_encrypt_type != LO_CRYPT_NONE) {
tprint_struct_next();
PRINT_FIELD_CSTRING(*info64, lo_crypt_name);
const unsigned int lo_encrypt_key_size =
MIN((unsigned) info64->lo_encrypt_key_size, LO_KEY_SIZE);
tprint_struct_next();
PRINT_FIELD_STRING(*info64, lo_encrypt_key,
lo_encrypt_key_size, 0);
}
if (!abbrev(tcp)) {
tprint_struct_next();
PRINT_FIELD_X_ARRAY(*info64, lo_init);
} else {
tprint_struct_next();
tprint_more_data_follows();
}
tprint_struct_end();
}
static void
decode_loop_info64(struct tcb *const tcp, const kernel_ulong_t addr)
{
struct loop_info64 info64;
if (!umove_or_printaddr(tcp, addr, &info64))
print_loop_info64(tcp, &info64);
}
static void
decode_loop_config(struct tcb *const tcp, const kernel_ulong_t addr)
{
struct loop_config config;
if (umove_or_printaddr(tcp, addr, &config))
return;
tprint_struct_begin();
PRINT_FIELD_FD(config, fd, tcp);
tprint_struct_next();
PRINT_FIELD_U(config, block_size);
tprint_struct_next();
PRINT_FIELD_OBJ_TCB_PTR(config, info, tcp, print_loop_info64);
if (!IS_ARRAY_ZERO(config.__reserved)) {
tprint_struct_next();
PRINT_FIELD_X_ARRAY(config, __reserved);
}
tprint_struct_end();
}
MPERS_PRINTER_DECL(int, loop_ioctl,
struct tcb *tcp, const unsigned int code,
const kernel_ulong_t arg)
{
switch (code) {
case LOOP_GET_STATUS:
if (entering(tcp))
return 0;
ATTRIBUTE_FALLTHROUGH;
case LOOP_SET_STATUS:
tprint_arg_next();
decode_loop_info(tcp, arg);
break;
case LOOP_GET_STATUS64:
if (entering(tcp))
return 0;
ATTRIBUTE_FALLTHROUGH;
case LOOP_SET_STATUS64:
tprint_arg_next();
decode_loop_info64(tcp, arg);
break;
case LOOP_CONFIGURE:
tprint_arg_next();
decode_loop_config(tcp, arg);
break;
case LOOP_CLR_FD:
case LOOP_SET_CAPACITY:
/* newer loop-control stuff */
case LOOP_CTL_GET_FREE:
/* Takes no arguments */
break;
case LOOP_SET_FD:
case LOOP_CHANGE_FD:
tprint_arg_next();
printfd(tcp, arg);
break;
/* newer loop-control stuff */
case LOOP_CTL_ADD:
case LOOP_CTL_REMOVE:
tprint_arg_next();
PRINT_VAL_D((int) arg);
break;
case LOOP_SET_DIRECT_IO:
case LOOP_SET_BLOCK_SIZE:
tprint_arg_next();
PRINT_VAL_U(arg);
break;
default:
return RVAL_DECODED;
}
return RVAL_IOCTL_DECODED;
}
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