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UBI: handle attach ioctl

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Actually implement the MTD device attach/detach handlers.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
This commit is contained in:
Artem Bityutskiy
2007-12-18 18:23:39 +02:00
parent 9b79cc0f84
commit 897a316c9e
3 changed files with 135 additions and 42 deletions
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95
drivers/mtd/ubi/cdev.c
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@@ -44,17 +44,6 @@
#include <asm/div64.h>
#include "ubi.h"
/*
* Maximum sequence numbers of UBI and volume character device IOCTLs (direct
* logical eraseblock erase is a debug-only feature).
*/
#define UBI_CDEV_IOC_MAX_SEQ 2
#ifndef CONFIG_MTD_UBI_DEBUG_USERSPACE_IO
#define VOL_CDEV_IOC_MAX_SEQ 1
#else
#define VOL_CDEV_IOC_MAX_SEQ 2
#endif
/**
* get_exclusive - get exclusive access to an UBI volume.
* @desc: volume descriptor
@@ -582,8 +571,7 @@ static int ubi_cdev_ioctl(struct inode *inode, struct file *file,
struct ubi_mkvol_req req;
dbg_msg("create volume");
err = copy_from_user(&req, argp,
sizeof(struct ubi_mkvol_req));
err = copy_from_user(&req, argp, sizeof(struct ubi_mkvol_req));
if (err) {
err = -EFAULT;
break;
@@ -647,8 +635,7 @@ static int ubi_cdev_ioctl(struct inode *inode, struct file *file,
struct ubi_rsvol_req req;
dbg_msg("re-size volume");
err = copy_from_user(&req, argp,
sizeof(struct ubi_rsvol_req));
err = copy_from_user(&req, argp, sizeof(struct ubi_rsvol_req));
if (err) {
err = -EFAULT;
break;
@@ -684,8 +671,86 @@ static int ubi_cdev_ioctl(struct inode *inode, struct file *file,
return err;
}
static int ctrl_cdev_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
int err = 0;
void __user *argp = (void __user *)arg;
if (!capable(CAP_SYS_RESOURCE))
return -EPERM;
switch (cmd) {
/* Attach an MTD device command */
case UBI_IOCATT:
{
struct ubi_attach_req req;
struct mtd_info *mtd;
dbg_msg("attach MTD device");
err = copy_from_user(&req, argp, sizeof(struct ubi_attach_req));
if (err) {
err = -EFAULT;
break;
}
if (req.mtd_num < 0 ||
(req.ubi_num < 0 && req.ubi_num != UBI_DEV_NUM_AUTO)) {
err = -EINVAL;
break;
}
mtd = get_mtd_device(NULL, req.mtd_num);
if (IS_ERR(mtd)) {
err = PTR_ERR(mtd);
break;
}
/*
* Note, further request verification is done by
* 'ubi_attach_mtd_dev()'.
*/
mutex_lock(&ubi_devices_mutex);
err = ubi_attach_mtd_dev(mtd, req.ubi_num, req.vid_hdr_offset);
mutex_unlock(&ubi_devices_mutex);
if (err < 0)
put_mtd_device(mtd);
else
/* @err contains UBI device number */
err = put_user(err, (__user int32_t *)argp);
break;
}
/* Detach an MTD device command */
case UBI_IOCDET:
{
int ubi_num;
dbg_msg("dettach MTD device");
err = get_user(ubi_num, (__user int32_t *)argp);
if (err) {
err = -EFAULT;
break;
}
mutex_lock(&ubi_devices_mutex);
err = ubi_detach_mtd_dev(ubi_num, 0);
mutex_unlock(&ubi_devices_mutex);
break;
}
default:
err = -ENOTTY;
break;
}
return err;
}
/* UBI control character device operations */
struct file_operations ubi_ctrl_cdev_operations = {
.ioctl = ctrl_cdev_ioctl,
.owner = THIS_MODULE,
};