mtd: add BLKPG API based repartition support
Add support for mtd repartition based on the block
device BLKPG interface:
BLKPG_ADD_PARTITION - for partition creation;
BLKPG_DEL_PARTITION - for partition delete
The usage is based on BLKPG ioctl called with
struct blkpg_ioctl_arg argument which includes the
reference to struct blkpg_partition discribing the
partition offset and length.
Disadvantage: there is no implementation for mtd
flags control. The flags are always borrowed from
the master device.
Signed-off-by: Roman Tereshonkov <roman.tereshonkov@nokia.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index 5895de7..b7ed09c 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -30,8 +30,9 @@
#include <linux/backing-dev.h>
#include <linux/compat.h>
#include <linux/mount.h>
-
+#include <linux/blkpg.h>
#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
#include <linux/mtd/map.h>
#include <asm/uaccess.h>
@@ -510,6 +511,45 @@
return 0;
}
+#ifdef CONFIG_MTD_PARTITIONS
+static int mtd_blkpg_ioctl(struct mtd_info *mtd,
+ struct blkpg_ioctl_arg __user *arg)
+{
+ struct blkpg_ioctl_arg a;
+ struct blkpg_partition p;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ /* Only master mtd device must be used to control partitions */
+ if (!mtd_is_master(mtd))
+ return -EINVAL;
+
+ if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg)))
+ return -EFAULT;
+
+ if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition)))
+ return -EFAULT;
+
+ switch (a.op) {
+ case BLKPG_ADD_PARTITION:
+
+ return mtd_add_partition(mtd, p.devname, p.start, p.length);
+
+ case BLKPG_DEL_PARTITION:
+
+ if (p.pno < 0)
+ return -EINVAL;
+
+ return mtd_del_partition(mtd, p.pno);
+
+ default:
+ return -EINVAL;
+ }
+}
+#endif
+
+
static int mtd_ioctl(struct file *file, u_int cmd, u_long arg)
{
struct mtd_file_info *mfi = file->private_data;
@@ -900,6 +940,22 @@
break;
}
+#ifdef CONFIG_MTD_PARTITIONS
+ case BLKPG:
+ {
+ ret = mtd_blkpg_ioctl(mtd,
+ (struct blkpg_ioctl_arg __user *)arg);
+ break;
+ }
+
+ case BLKRRPART:
+ {
+ /* No reread partition feature. Just return ok */
+ ret = 0;
+ break;
+ }
+#endif
+
default:
ret = -ENOTTY;
}
@@ -1078,7 +1134,7 @@
const char *dev_name, void *data,
struct vfsmount *mnt)
{
- return get_sb_pseudo(fs_type, "mtd_inode:", NULL, MTD_INODE_FS_MAGIC,
+ return get_sb_pseudo(fs_type, "mtd_inode:", NULL, MTD_INODE_FS_MAGIC,
mnt);
}