Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=96a1f7dba6e464155c0d1dc69c6c2efa96b644ac
Commit:     96a1f7dba6e464155c0d1dc69c6c2efa96b644ac
Parent:     aa5617c55357d86c9082ba1d66fa9795370c9954
Author:     Mike Anderson <[EMAIL PROTECTED]>
AuthorDate: Fri Oct 19 22:47:59 2007 +0100
Committer:  Alasdair G Kergon <[EMAIL PROTECTED]>
CommitDate: Sat Oct 20 02:01:23 2007 +0100

    dm: export name and uuid
    
    This patch adds a function to obtain a copy of a mapped device's name and 
uuid.
    
    Signed-off-by: Mike Anderson <[EMAIL PROTECTED]>
    Signed-off-by: Alasdair G Kergon <[EMAIL PROTECTED]>
---
 drivers/md/dm-ioctl.c         |   32 ++++++++++++++++++++++++++++++++
 include/linux/device-mapper.h |    1 +
 2 files changed, 33 insertions(+), 0 deletions(-)

diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index 6af95f9..138200b 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -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;
+}
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index 499f537..8b3c7cd 100644
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -188,6 +188,7 @@ int dm_wait_event(struct mapped_device *md, int event_nr);
  * 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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