blkmap: store type of blkmap slice in corresponding structure
Add information about the type of blkmap slices as an attribute in the
corresponding slice structure. Put information in the blkmap slice
structure to identify if it is associated with a memory or linear
mapped device. Which can then be used to take specific action based on
the type of the blkmap slice.
Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org>
Reviewed-by: Tobias Waldekranz <tobias@waldekranz.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
diff --git a/drivers/block/blkmap.c b/drivers/block/blkmap.c
index 34eed13..08f6857 100644
--- a/drivers/block/blkmap.c
+++ b/drivers/block/blkmap.c
@@ -17,6 +17,22 @@
struct blkmap;
/**
+ * define BLKMAP_SLICE_LINEAR - Linear mapping to another block device
+ *
+ * This blkmap slice type is used for mapping to other existing block
+ * devices.
+ */
+#define BLKMAP_SLICE_LINEAR BIT(0)
+
+/**
+ * define BLKMAP_SLICE_MEM - Linear mapping to memory based block device
+ *
+ * This blkmap slice type is used for mapping to memory based block
+ * devices, like ramdisks.
+ */
+#define BLKMAP_SLICE_MEM BIT(1)
+
+/**
* struct blkmap_slice - Region mapped to a blkmap
*
* Common data for a region mapped to a blkmap, specialized by each
@@ -25,12 +41,14 @@
* @node: List node used to associate this slice with a blkmap
* @blknr: Start block number of the mapping
* @blkcnt: Number of blocks covered by this mapping
+ * @attr: Attributes of blkmap slice
*/
struct blkmap_slice {
struct list_head node;
lbaint_t blknr;
lbaint_t blkcnt;
+ uint attr;
/**
* @read: - Read from slice
@@ -169,6 +187,7 @@
.slice = {
.blknr = blknr,
.blkcnt = blkcnt,
+ .attr = BLKMAP_SLICE_LINEAR,
.read = blkmap_linear_read,
.write = blkmap_linear_write,
@@ -248,6 +267,7 @@
.slice = {
.blknr = blknr,
.blkcnt = blkcnt,
+ .attr = BLKMAP_SLICE_MEM,
.read = blkmap_mem_read,
.write = blkmap_mem_write,