[PATCH RFC v2] UBI: New ioctl() to support ubidump

[hujianyang]

An ioctl() return pnum of a specified leb.


Signed-off-by: hujianyang <hujianyang at huawei.com>
---
 drivers/mtd/ubi/cdev.c      | 26 ++++++++++++++++++++++++++
 include/uapi/mtd/ubi-user.h | 12 ++++++++++++
 2 files changed, 38 insertions(+)

diff --git a/drivers/mtd/ubi/cdev.c b/drivers/mtd/ubi/cdev.c
index 7646220..6fa7346 100644
--- a/drivers/mtd/ubi/cdev.c
+++ b/drivers/mtd/ubi/cdev.c
@@ -581,6 +581,32 @@ static long vol_cdev_ioctl(struct file *file, unsigned int cmd,
 		break;
 	}

+	/* Get pnum of a specified leb command */
+	case UBI_IOCEBGETPNUM:
+	{
+		struct ubi_lnum2pnum_req req;
+		int pnum;
+
+		err = copy_from_user(&req, argp,
+				sizeof(struct ubi_lnum2pnum_req));
+		if (err) {
+			err = -EFAULT;
+			break;
+		}
+
+		err = ubi_is_mapped(desc, req.lnum);
+		if (err <= 0)
+			break;
+		pnum = vol->eba_tbl[req.lnum];
+		req.pnum = pnum;
+
+		err = copy_to_user(argp, &req,
+				sizeof(struct ubi_lnum2pnum_req));
+		if (err)
+			err = -EFAULT;
+		break;
+	}
+
 	default:
 		err = -ENOTTY;
 		break;
diff --git a/include/uapi/mtd/ubi-user.h b/include/uapi/mtd/ubi-user.h
index 1927b0d..fc41ddb 100644
--- a/include/uapi/mtd/ubi-user.h
+++ b/include/uapi/mtd/ubi-user.h
@@ -205,6 +205,8 @@
 #define UBI_IOCVOLCRBLK _IOW(UBI_VOL_IOC_MAGIC, 7, struct ubi_blkcreate_req)
 /* Remove the R/O block device */
 #define UBI_IOCVOLRMBLK _IO(UBI_VOL_IOC_MAGIC, 8)
+/* Get pnum of a specified leb */
+#define UBI_IOCEBGETPNUM _IOW(UBI_VOL_IOC_MAGIC, 9, struct ubi_lnum2pnum_req)

 /* Maximum MTD device name length supported by UBI */
 #define MAX_UBI_MTD_NAME_LEN 127
@@ -442,4 +444,14 @@ struct ubi_blkcreate_req {
 	__s8  padding[128];
 }  __packed;

+/**
+ * struct ubi_lnum2pnum_req - a data structure used in lnum translate requests.
+ * @lnum: logical eraseblock num to translate
+ * @pnum: physical eraseblock num @lnum mapped
+ */
+struct ubi_lnum2pnum_req {
+	__s32 lnum;
+	__s32 pnum;
+}  __packed;
+
 #endif /* __UBI_USER_H__ */
-- 
1.8.1.4