UBI: handle attach ioctl
Actually implement the MTD device attach/detach handlers.
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
diff --git a/drivers/mtd/ubi/cdev.c b/drivers/mtd/ubi/cdev.c
index 01978b5..a60a3a2 100644
--- a/drivers/mtd/ubi/cdev.c
+++ b/drivers/mtd/ubi/cdev.c
@@ -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 @@
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 @@
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 @@
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,
};