Хотел собрать модуль ядра следующий
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/blkdev.h>
#include <linux/cdev.h>
#include <linux/kthread.h>
#include <linux/interrupt.h>
#include <linux/bio.h>
#include <linux/blkdev.h>
#include <linux/types.h>
#include <linux/major.h>
#include <linux/file.h>
#include <linux/slab.h>
#include <linux/kdev_t.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <asm/uaccess.h>
#include <linux/types.h>
#include <linux/buffer_head.h>
#include <linux/delay.h>
#include <linux/workqueue.h>
#include <linux/sched.h>
#include <linux/mm.h>
#define PARTITION_NAME "/dev/sda1"
#define DELAY(); \
printk(KERN_INFO "filter: FUNCTION=%s LINE=%d\n", __FUNCTION__, __LINE__); \
set_current_state(TASK_UNINTERRUPTIBLE); \
schedule_timeout(HZ * 5);
struct block_device *bd;
make_request_fn *orig_mrqfn;
static void filter_mrqfn(struct request_queue *rq, struct bio *b)
{
orig_mrqfn(rq, b); /* calling the original make_request_fn() */
}
/*
* set_mrqfn() - Change the original make_request_fn() to our
* modules request function
*/
static void set_mrqfn(void)
{
int ret;
struct super_block *sb = bd->bd_super;
printk(KERN_DEBUG "filter: %s\n", __FUNCTION__);
DELAY();
/* lock filesystem to prevent any further changes */
sb = freeze_bdev(bd);
if (sb)
printk(KERN_INFO "filter: freez block device\n");
DELAY();
if (bd->bd_disk->queue->make_request_fn == filter_mrqfn) {
printk(KERN_INFO "filter: modules request function is already active\n");
} else {
/* save the pointer to the original make_request_fn() */
orig_mrqfn = bd->bd_disk->queue->make_request_fn;
/* replace the original with our modules request function */
bd->bd_disk->queue->make_request_fn = filter_mrqfn;
}
/* unlock filesystem */
thaw_bdev(bd, sb);
}
/*
* restore_mrqfn() - Restore the original make_request_fn()
*/
static void restore_mrqfn(void)
{
struct super_block *sb = bd->bd_super;
printk(KERN_DEBUG "filter: %s\n", __FUNCTION__);
if (orig_mrqfn) {
/* lock filesystem to prevent any further changes */
freeze_super(sb);
/* restore the original request function */
bd->bd_disk->queue->make_request_fn = orig_mrqfn;
/* unlock filesystem */
thaw_super(sb);
}
orig_mrqfn = NULL;
}
static int __init filter_init(void)
{
printk(KERN_DEBUG "filter: %s\n", __FUNCTION__);
orig_mrqfn = NULL;
// Read block device from path
bd = blkdev_get_by_path(PARTITION_NAME, FMODE_READ, NULL);
if (IS_ERR(bd)) {
printk(KERN_ERR "filter: failed to get block device\n");
return 0;
}
set_mrqfn();
return 0;
}
static void __exit filter_exit(void)
{
printk(KERN_DEBUG "filter: %s\n", __FUNCTION__);
restore_mrqfn();
if (!IS_ERR(bd)) {
blkdev_put(bd, FMODE_READ);
}
}
module_init(filter_init);
module_exit(filter_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Me");
Вот гитхаб
https://gist.github.com/prashants/3839380
При сборке пишет
make -C /usr/src/linux-headers-4.10.0-28-generic SUBDIRS=/home/llex/trash modules
make[1]: вход в каталог «/usr/src/linux-headers-4.10.0-28-generic»
CC [M] /home/llex/trash/filter.o
/home/llex/trash/filter.c: In function ‘set_mrqfn’:
/home/llex/trash/filter.c:59:42: warning: comparison of distinct pointer types lacks a cast
if (bd->bd_disk->queue->make_request_fn == filter_mrqfn) {
^
/home/llex/trash/filter.c:65:39: error: assignment from incompatible pointer type [-Werror=incompatible-pointer-types]
bd->bd_disk->queue->make_request_fn = filter_mrqfn;
^
/home/llex/trash/filter.c:48:6: warning: unused variable ‘ret’ [-Wunused-variable]
int ret;
^
cc1: some warnings being treated as errors
scripts/Makefile.build:301: ошибка выполнения рецепта для цели «/home/llex/trash/filter.o»
make[2]: *** [/home/llex/trash/filter.o] Ошибка 1
Makefile:1524: ошибка выполнения рецепта для цели «_module_/home/llex/trash»
make[1]: *** [_module_/home/llex/trash] Ошибка 2
make[1]: выход из каталога «/usr/src/linux-headers-4.10.0-28-generic»
Makefile:7: ошибка выполнения рецепта для цели «default»
make: *** [default] Ошибка 2
Ядро 4.10.
В чем может быть ошибка?
