From: Mike Anderson <andmike@xxxxxxxxxxxxxxxxxx>
This patch adds a function to obtain a copy of a mapped device's name and uuid.
Signed-off-by: Mike Anderson <andmike@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Alasdair G Kergon <agk@xxxxxxxxxx>
---
drivers/md/dm-ioctl.c | 32 ++++++++++++++++++++++++++++++++
include/linux/device-mapper.h | 1 +
2 files changed, 33 insertions(+)
Index: linux-2.6.23/drivers/md/dm-ioctl.c
===================================================================
--- linux-2.6.23.orig/drivers/md/dm-ioctl.c 2007-10-14 00:08:12.000000000 +0100
+++ linux-2.6.23/drivers/md/dm-ioctl.c 2007-10-16 13:09:27.000000000 +0100
@@ -1515,3 +1515,35 @@ void dm_interface_exit(void)
dm_hash_exit();
}
+
+/**
+ * dm_copy_name_and_uuid - Copy mapped device name & uuid into supplied buffers
+ * @md: Pointer to mapped_device
+ * @name: Buffer (size DM_NAME_LEN) for name
+ * @uuid: Buffer (size DM_UUID_LEN) for uuid or empty string if uuid not defined
+ */
+int dm_copy_name_and_uuid(struct mapped_device *md, char *name, char *uuid)
+{
+ int r = 0;
+ struct hash_cell *hc;
+
+ if (!md)
+ return -ENXIO;
+
+ dm_get(md);
+ down_read(&_hash_lock);
+ hc = dm_get_mdptr(md);
+ if (!hc || hc->md != md) {
+ r = -ENXIO;
+ goto out;
+ }
+
+ strcpy(name, hc->name);
+ strcpy(uuid, hc->uuid ? : "");
+
+out:
+ up_read(&_hash_lock);
+ dm_put(md);
+
+ return r;
+}
Index: linux-2.6.23/include/linux/device-mapper.h
===================================================================
--- linux-2.6.23.orig/include/linux/device-mapper.h 2007-10-09 21:31:38.000000000 +0100
+++ linux-2.6.23/include/linux/device-mapper.h 2007-10-14 00:08:31.000000000 +0100
@@ -188,6 +188,7 @@ int dm_wait_event(struct mapped_device *
* Info functions.
*/
const char *dm_device_name(struct mapped_device *md);
+int dm_copy_name_and_uuid(struct mapped_device *md, char *name, char *uuid);
struct gendisk *dm_disk(struct mapped_device *md);
int dm_suspended(struct mapped_device *md);
int dm_noflush_suspending(struct dm_target *ti);
--
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