dm error: add DAX support

Allow the error target to replace an existing DAX-enabled target.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>

diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index ee6f37e..3e407a9 100644 (file)
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -922,7 +922,8 @@ static int dm_table_determine_type(struct dm_table *t)
        if (bio_based) {
                /* We must use this table as bio-based */
                t->type = DM_TYPE_BIO_BASED;
-               if (dm_table_supports_dax(t))
+               if (dm_table_supports_dax(t) ||
+                   (list_empty(devices) && live_md_type == DM_TYPE_DAX_BIO_BASED))
                        t->type = DM_TYPE_DAX_BIO_BASED;
                return 0;
        }

diff --git a/drivers/md/dm-target.c b/drivers/md/dm-target.c
index 5c826b4..6eecd6b 100644 (file)
--- a/drivers/md/dm-target.c
+++ b/drivers/md/dm-target.c
@@ -148,9 +148,15 @@ static void io_err_release_clone_rq(struct request *clone)
 {
 }
 
+static long io_err_direct_access(struct dm_target *ti, sector_t sector,
+                                void __pmem **kaddr, pfn_t *pfn, long size)
+{
+       return -EIO;
+}
+
 static struct target_type error_target = {
        .name = "error",
-       .version = {1, 4, 0},
+       .version = {1, 5, 0},
        .features = DM_TARGET_WILDCARD,
        .ctr  = io_err_ctr,
        .dtr  = io_err_dtr,
@@ -158,6 +164,7 @@ static struct target_type error_target = {
        .map_rq = io_err_map_rq,
        .clone_and_map_rq = io_err_clone_and_map_rq,
        .release_clone_rq = io_err_release_clone_rq,
+       .direct_access = io_err_direct_access,
 };
 
 int __init dm_target_init(void)