Add the 'sync_super' function pointer to MD array structure (struct mddev_s)
If device-mapper (dm-raid.c) is to define its own on-disk superblock and be
able to load it, there must still be a way for MD to initiate superblock
updates. The simplest way to make this happen is to provide a pointer in
the MD array structure that can be set by device-mapper (or other module)
with a function to do this. If the function has been set, it will be used;
otherwise, the method with be looked up via 'super_types' as usual.
Signed-off-by: Jonathan Brassow <jbrassow@xxxxxxxxxx>
Index: linux-2.6/drivers/md/md.c
===================================================================
--- linux-2.6.orig/drivers/md/md.c
+++ linux-2.6/drivers/md/md.c
@@ -1753,6 +1753,18 @@ static struct super_type super_types[] =
},
};
+static void sync_super(mddev_t *mddev, mdk_rdev_t *rdev)
+{
+ if (mddev->sync_super) {
+ mddev->sync_super(mddev, rdev);
+ return;
+ }
+
+ BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types));
+
+ super_types[mddev->major_version].sync_super(mddev, rdev);
+}
+
static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
{
mdk_rdev_t *rdev, *rdev2;
@@ -2171,8 +2183,7 @@ static void sync_sbs(mddev_t * mddev, in
/* Don't update this superblock */
rdev->sb_loaded = 2;
} else {
- super_types[mddev->major_version].
- sync_super(mddev, rdev);
+ sync_super(mddev, rdev);
rdev->sb_loaded = 1;
}
}
Index: linux-2.6/drivers/md/md.h
===================================================================
--- linux-2.6.orig/drivers/md/md.h
+++ linux-2.6/drivers/md/md.h
@@ -330,6 +330,7 @@ struct mddev_s
atomic_t flush_pending;
struct work_struct flush_work;
struct work_struct event_work; /* used by dm to report failure event */
+ void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
};
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