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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.h
parentd58168763f74d1edbc296d7038c60efe6493fdd4 (diff)
downloadtalos-op-linux-784aae735d9b0bba3f8b9faef4c8b30df3bf0128.tar.gz
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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.h')
-rw-r--r--drivers/md/dm.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/md/dm.h b/drivers/md/dm.h
index bbbe9110f3bf..20194e000c5a 100644
--- a/drivers/md/dm.h
+++ b/drivers/md/dm.h
@@ -74,6 +74,14 @@ int dm_interface_init(void);
void dm_interface_exit(void);
/*
+ * sysfs interface
+ */
+int dm_sysfs_init(struct mapped_device *md);
+void dm_sysfs_exit(struct mapped_device *md);
+struct kobject *dm_kobject(struct mapped_device *md);
+struct mapped_device *dm_get_from_kobject(struct kobject *kobj);
+
+/*
* Targets for linear and striped mappings
*/
int dm_linear_init(void);
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