summaryrefslogtreecommitdiff
path: root/drivers/md/dm.c
diff options
context:
space:
mode:
authorMilan Broz <mbroz@redhat.com>2009-01-06 03:05:12 +0000
committerAlasdair G Kergon <agk@redhat.com>2009-01-06 03:05:12 +0000
commit784aae735d9b0bba3f8b9faef4c8b30df3bf0128 (patch)
tree7e2e956c395b27f63569d7a6adc1098f116cc3a4 /drivers/md/dm.c
parentd58168763f74d1edbc296d7038c60efe6493fdd4 (diff)
dm: add name and uuid to sysfs
Implement simple read-only sysfs entry for device-mapper block device. This patch adds a simple sysfs directory named "dm" under block device properties and implements - name attribute (string containing mapped device name) - uuid attribute (string containing UUID, or empty string if not set) The kobject is embedded in mapped_device struct, so no additional memory allocation is needed for initializing sysfs entry. During the processing of sysfs attribute we need to lock mapped device which is done by a new function dm_get_from_kobj, which returns the md associated with kobject and increases the usage count. Each 'show attribute' function is responsible for its own locking. Signed-off-by: Milan Broz <mbroz@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/dm.c')
-rw-r--r--drivers/md/dm.c29
1 files changed, 28 insertions, 1 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 9f9aa64f7336..51ba1db4b3e7 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1,6 +1,6 @@
/*
* Copyright (C) 2001, 2002 Sistina Software (UK) Limited.
- * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
*
* This file is released under the GPL.
*/
@@ -167,6 +167,9 @@ struct mapped_device {
/* forced geometry settings */
struct hd_geometry geometry;
+
+ /* sysfs handle */
+ struct kobject kobj;
};
#define MIN_IOS 256
@@ -1285,6 +1288,8 @@ int dm_create(int minor, struct mapped_device **result)
if (!md)
return -ENXIO;
+ dm_sysfs_init(md);
+
*result = md;
return 0;
}
@@ -1360,6 +1365,7 @@ void dm_put(struct mapped_device *md)
dm_table_presuspend_targets(map);
dm_table_postsuspend_targets(map);
}
+ dm_sysfs_exit(md);
dm_table_put(map);
__unbind(md);
free_dev(md);
@@ -1699,6 +1705,27 @@ struct gendisk *dm_disk(struct mapped_device *md)
return md->disk;
}
+struct kobject *dm_kobject(struct mapped_device *md)
+{
+ return &md->kobj;
+}
+
+/*
+ * struct mapped_device should not be exported outside of dm.c
+ * so use this check to verify that kobj is part of md structure
+ */
+struct mapped_device *dm_get_from_kobject(struct kobject *kobj)
+{
+ struct mapped_device *md;
+
+ md = container_of(kobj, struct mapped_device, kobj);
+ if (&md->kobj != kobj)
+ return NULL;
+
+ dm_get(md);
+ return md;
+}
+
int dm_suspended(struct mapped_device *md)
{
return test_bit(DMF_SUSPENDED, &md->flags);