linux-kernel - [RFC PATCH mtd-utils 031/110] libubi: Add new interface ubi_leb

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Message-ID: <20240607042615.2069840-32-chengzhihao1@huawei.com>
Date: Fri, 7 Jun 2024 12:24:56 +0800
From: Zhihao Cheng <chengzhihao1@...wei.com>
To: <richard@....at>, <david.oberhollenzer@...ma-star.at>,
	<miquel.raynal@...tlin.com>, <yi.zhang@...wei.com>, <xiangyang3@...wei.com>,
	<huangxiaojia2@...wei.com>
CC: <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: [RFC PATCH mtd-utils 031/110] libubi: Add new interface ubi_leb_map()

Add ubi_leb_map() implementation, it is used in UBIFS linux kernel libs.

This is a preparation for replacing implementation of UBIFS utils with
linux kernel libs.

Signed-off-by: Zhihao Cheng <chengzhihao1@...wei.com>
---
 include/libubi.h | 15 +++++++++++++++
 lib/libubi.c     | 10 ++++++++++
 2 files changed, 25 insertions(+)

diff --git a/include/libubi.h b/include/libubi.h
index e1e234e1..213948d5 100644
--- a/include/libubi.h
+++ b/include/libubi.h
@@ -487,6 +487,21 @@ int ubi_leb_unmap(int fd, int lnum);
  */
 int ubi_is_mapped(int fd, int lnum);
 
+/**
+ * ubi_leb_map - map logical eraseblock to a physical eraseblock.
+ * @fd: volume character device file descriptor
+ * @lnum: logical eraseblock number
+ *
+ * This function maps an un-mapped logical eraseblock @lnum to a physical
+ * eraseblock. This means, that after a successful invocation of this
+ * function the logical eraseblock @lnum will be empty (contain only %0xFF
+ * bytes) and be mapped to a physical eraseblock, even if an unclean reboot
+ * happens.
+ *
+ * This function returns zero in case of success, %-1 in case of failures.
+ */
+int ubi_leb_map(int fd, int lnum);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/lib/libubi.c b/lib/libubi.c
index 6b57e50d..86736dd5 100644
--- a/lib/libubi.c
+++ b/lib/libubi.c
@@ -1364,3 +1364,13 @@ int ubi_is_mapped(int fd, int lnum)
 {
 	return ioctl(fd, UBI_IOCEBISMAP, &lnum);
 }
+
+int ubi_leb_map(int fd, int lnum)
+{
+	struct ubi_map_req r;
+
+	memset(&r, 0, sizeof(struct ubi_map_req));
+	r.lnum = lnum;
+
+	return ioctl(fd, UBI_IOCEBMAP, &r);
+}
-- 
2.13.6