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Subject[PATCH 2/3] sysfs representation of stacked devices (dm)
This patch modifies dm driver to create symlinks to/from
underlying devices.

--
Jun'ichi Nomura, NEC Solutions (America), Inc.
Exporting stacked device relationship to sysfs (dm)

Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>

--- linux-2.6.15.orig/drivers/md/dm.c 2006-01-02 22:21:10.000000000 -0500
+++ linux-2.6.15/drivers/md/dm.c 2006-02-14 12:18:13.000000000 -0500
@@ -853,6 +853,7 @@ static int __bind(struct mapped_device *

dm_table_get(t);
dm_table_event_callback(t, event_callback, md);
+ dm_link_device(md, t);

write_lock(&md->map_lock);
md->map = t;
@@ -873,6 +874,7 @@ static void __unbind(struct mapped_devic
write_lock(&md->map_lock);
md->map = NULL;
write_unlock(&md->map_lock);
+ dm_unlink_device(md, map);
dm_table_put(map);
}

--- linux-2.6.15.orig/drivers/md/dm.h 2006-01-02 22:21:10.000000000 -0500
+++ linux-2.6.15/drivers/md/dm.h 2006-02-14 12:21:10.000000000 -0500
@@ -94,6 +94,12 @@ int dm_wait_event(struct mapped_device *
struct gendisk *dm_disk(struct mapped_device *md);
int dm_suspended(struct mapped_device *md);

+/*
+ * kobject linking functions
+ */
+int dm_link_device(struct mapped_device *md, struct dm_table *t);
+int dm_unlink_device(struct mapped_device *md, struct dm_table *t);
+
/*-----------------------------------------------------------------
* Functions for manipulating a table. Tables are also reference
* counted.
--- linux-2.6.15.orig/drivers/md/dm-table.c 2006-01-02 22:21:10.000000000 -0500
+++ linux-2.6.15/drivers/md/dm-table.c 2006-02-16 23:25:49.000000000 -0500
@@ -53,6 +53,9 @@ struct dm_table {
/* events get handed up using this callback */
void (*event_fn)(void *);
void *event_context;
+
+ /* sysfs deptree */
+ struct kobject slave_dir;
};

/*
@@ -945,6 +948,43 @@ int dm_table_flush_all(struct dm_table *
return ret;
}

+/* create sysfs symlinks between mapped device and underlying devices */
+int dm_link_device(struct mapped_device *md, struct dm_table *t)
+{
+ struct list_head *d, *devices;
+ struct kobject *md_kobj;
+
+ md_kobj = &dm_disk(md)->kobj;
+ stackdev_init(&t->slave_dir, md_kobj);
+
+ devices = dm_table_get_devices(t);
+ for (d = devices->next; d != devices; d = d->next) {
+ struct dm_dev *dd = list_entry(d, struct dm_dev, list);
+ stackdev_link(dd->bdev, &t->slave_dir, md_kobj);
+ }
+
+ return 0;
+}
+
+/* remove sysfs symlinks between mapped device and underlying devices */
+int dm_unlink_device(struct mapped_device *md, struct dm_table *t)
+{
+ struct list_head *d, *devices;
+ struct kobject *md_kobj;
+
+ md_kobj = &dm_disk(md)->kobj;
+
+ devices = dm_table_get_devices(t);
+ for (d = devices->next; d != devices; d = d->next) {
+ struct dm_dev *dd = list_entry(d, struct dm_dev, list);
+ stackdev_unlink(dd->bdev, &t->slave_dir, md_kobj);
+ }
+
+ stackdev_clear(&t->slave_dir);
+
+ return 0;
+}
+
EXPORT_SYMBOL(dm_vcalloc);
EXPORT_SYMBOL(dm_get_device);
EXPORT_SYMBOL(dm_put_device);
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