ubi: fastmap: Add control in 'UBI_IOCATT' ioctl to reserve PEBs for filling pools

This patch imports a new field 'need_resv_pool' in struct 'ubi_attach_req'
to control whether or not reserving free PEBs for filling pool/wl_pool.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=217787
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

Author: Zhihao Cheng

drivers/mtd/ubi/cdev.c

@@ -1042,7 +1042,7 @@ static long ctrl_cdev_ioctl(struct file *file, unsigned int cmd,
 		mutex_lock(&ubi_devices_mutex);
 		err = ubi_attach_mtd_dev(mtd, req.ubi_num, req.vid_hdr_offset,
 					 req.max_beb_per1024, !!req.disable_fm,
-					 false);
+					 !!req.need_resv_pool);
 		mutex_unlock(&ubi_devices_mutex);
 		if (err < 0)
 			put_mtd_device(mtd);

include/uapi/mtd/ubi-user.h

@@ -248,6 +248,7 @@ enum {
  * @max_beb_per1024: maximum expected number of bad PEB per 1024 PEBs
  * @padding: reserved for future, not used, has to be zeroed
  * @disable_fm: whether disable fastmap
+ * @need_resv_pool: whether reserve free pebs for filling pool/wl_pool
  *
  * This data structure is used to specify MTD device UBI has to attach and the
  * parameters it has to use. The number which should be assigned to the new UBI
@@ -293,7 +294,8 @@ struct ubi_attach_req {
 	__s32 vid_hdr_offset;
 	__s16 max_beb_per1024;
 	__s8 disable_fm;
-	__s8 padding[9];
+	__s8 need_resv_pool;
+	__s8 padding[8];
 };
 
 /*