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rbd: define some new format constants 

Define constant symbols related to the rbd format 2 object names.
This begins to bring this version of the "rbd_types.h" header
more in line with the current user-space version of that file.
Complete reconciliation of differences will be done at some
point later, as a separate task.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This commit is contained in:
Alex Elder 2012-07-10 20:30:10 -05:00
parent f8d4de6e1c
commit 3bb59ad515
1 changed files with 20 additions and 5 deletions
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25
drivers/block/rbd_types.h
View File

@ -15,15 +15,30 @@
#include <linux/types.h>
/* For format version 2, rbd image 'foo' consists of objects
* rbd_id.foo - id of image
* rbd_header.<id> - image metadata
* rbd_data.<id>.0000000000000000
* rbd_data.<id>.0000000000000001
* ... - data
* Clients do not access header data directly in rbd format 2.
*/
#define RBD_HEADER_PREFIX "rbd_header."
#define RBD_DATA_PREFIX "rbd_data."
#define RBD_ID_PREFIX "rbd_id."
/*
* rbd image 'foo' consists of objects
* foo.rbd - image metadata
* foo.00000000
* foo.00000001
* ... - data
* For format version 1, rbd image 'foo' consists of objects
* foo.rbd - image metadata
* rb.<idhi>.<idlo>.00000000
* rb.<idhi>.<idlo>.00000001
* ... - data
* There is no notion of a persistent image id in rbd format 1.
*/
#define RBD_SUFFIX ".rbd"
#define RBD_DIRECTORY "rbd_directory"
#define RBD_INFO "rbd_info"