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authorMike Frysinger <vapier@gentoo.org>2010-09-23 21:53:38 -0400
committerArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2010-09-25 13:49:01 +0300
commitf03d42afb0fa7599b626fc0c005424edfd123f99 (patch)
tree71b9041f118e992da11fb52cd6564466caff1ce8
parentae51fdc21dd5b299128ab04786a4f7528e09dae3 (diff)
libmtd: add lock/unlock helpers
Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
-rw-r--r--include/libmtd.h24
-rw-r--r--lib/libmtd.c32
2 files changed, 56 insertions, 0 deletions
diff --git a/include/libmtd.h b/include/libmtd.h
index afaba42..e30c8a6 100644
--- a/include/libmtd.h
+++ b/include/libmtd.h
@@ -138,6 +138,30 @@ int mtd_get_dev_info(libmtd_t desc, const char *node, struct mtd_dev_info *mtd);
int mtd_get_dev_info1(libmtd_t desc, int mtd_num, struct mtd_dev_info *mtd);
/**
+ * mtd_lock - lock eraseblocks.
+ * @desc: MTD library descriptor
+ * @mtd: MTD device description object
+ * @fd: MTD device node file descriptor
+ * @eb: eraseblock to lock
+ *
+ * This function locks eraseblock @eb. Returns %0 in case of success and %-1
+ * in case of failure.
+ */
+int mtd_lock(const struct mtd_dev_info *mtd, int fd, int eb);
+
+/**
+ * mtd_unlock - unlock eraseblocks.
+ * @desc: MTD library descriptor
+ * @mtd: MTD device description object
+ * @fd: MTD device node file descriptor
+ * @eb: eraseblock to lock
+ *
+ * This function unlocks eraseblock @eb. Returns %0 in case of success and %-1
+ * in case of failure.
+ */
+int mtd_unlock(const struct mtd_dev_info *mtd, int fd, int eb);
+
+/**
* mtd_erase - erase an eraseblock.
* @desc: MTD library descriptor
* @mtd: MTD device description object
diff --git a/lib/libmtd.c b/lib/libmtd.c
index d57ae8f..1b3d597 100644
--- a/lib/libmtd.c
+++ b/lib/libmtd.c
@@ -802,6 +802,38 @@ static int mtd_valid_erase_block(const struct mtd_dev_info *mtd, int eb)
return 0;
}
+static int mtd_xlock(const struct mtd_dev_info *mtd, int fd, int eb, int req,
+ const char *sreq)
+{
+ int ret;
+ struct erase_info_user ei;
+
+ ret = mtd_valid_erase_block(mtd, eb);
+ if (ret)
+ return ret;
+
+ ei.start = eb * mtd->eb_size;
+ ei.length = mtd->eb_size;
+
+ ret = ioctl(fd, req, &ei);
+ if (ret < 0)
+ return sys_errmsg("%s ioctl failed for eraseblock %d "
+ "(mtd%d)", sreq, eb, mtd->mtd_num);
+
+ return 0;
+}
+#define mtd_xlock(mtd, fd, eb, req) mtd_xlock(mtd, fd, eb, req, #req)
+
+int mtd_lock(const struct mtd_dev_info *mtd, int fd, int eb)
+{
+ return mtd_xlock(mtd, fd, eb, MEMLOCK);
+}
+
+int mtd_unlock(const struct mtd_dev_info *mtd, int fd, int eb)
+{
+ return mtd_xlock(mtd, fd, eb, MEMUNLOCK);
+}
+
int mtd_erase(libmtd_t desc, const struct mtd_dev_info *mtd, int fd, int eb)
{
int ret;