summaryrefslogtreecommitdiff
path: root/drivers/md/persistent-data/dm-space-map-metadata.h
diff options
context:
space:
mode:
authorJoe Thornber <thornber@redhat.com>2011-11-01 00:19:11 +0400
committerAlasdair G Kergon <agk@redhat.com>2011-11-01 00:19:11 +0400
commit3241b1d3e0aaafbfcd320f4d71ade629728cc4f4 (patch)
tree499461f724d4db3d7118641f4a20f5be23549edd /drivers/md/persistent-data/dm-space-map-metadata.h
parent95d402f057f2e208e4631893f6cd4a59c7c05e41 (diff)
downloadlinux-3241b1d3e0aaafbfcd320f4d71ade629728cc4f4.tar.xz
dm: add persistent data library
The persistent-data library offers a re-usable framework for the storage and management of on-disk metadata in device-mapper targets. It's used by the thin-provisioning target in the next patch and in an upcoming hierarchical storage target. For further information, please read Documentation/device-mapper/persistent-data.txt Signed-off-by: Joe Thornber <thornber@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/persistent-data/dm-space-map-metadata.h')
-rw-r--r--drivers/md/persistent-data/dm-space-map-metadata.h33
1 files changed, 33 insertions, 0 deletions
diff --git a/drivers/md/persistent-data/dm-space-map-metadata.h b/drivers/md/persistent-data/dm-space-map-metadata.h
new file mode 100644
index 000000000000..39bba0801cf2
--- /dev/null
+++ b/drivers/md/persistent-data/dm-space-map-metadata.h
@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2011 Red Hat, Inc.
+ *
+ * This file is released under the GPL.
+ */
+
+#ifndef DM_SPACE_MAP_METADATA_H
+#define DM_SPACE_MAP_METADATA_H
+
+#include "dm-transaction-manager.h"
+
+/*
+ * Unfortunately we have to use two-phase construction due to the cycle
+ * between the tm and sm.
+ */
+struct dm_space_map *dm_sm_metadata_init(void);
+
+/*
+ * Create a fresh space map.
+ */
+int dm_sm_metadata_create(struct dm_space_map *sm,
+ struct dm_transaction_manager *tm,
+ dm_block_t nr_blocks,
+ dm_block_t superblock);
+
+/*
+ * Open from a previously-recorded root.
+ */
+int dm_sm_metadata_open(struct dm_space_map *sm,
+ struct dm_transaction_manager *tm,
+ void *root_le, size_t len);
+
+#endif /* DM_SPACE_MAP_METADATA_H */