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dm snapshot: extend exception store functions

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Supply dm_add_exception as a callback to the read_metadata function.
Add a status function ready for a later patch and name the functions
consistently.

Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Jonathan Brassow
2009-01-06 03:05:19 +00:00
committed by Alasdair G Kergon
parent 4db6bfe02b
commit a159c1ac5f
6 changed files with 55 additions and 37 deletions
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13
drivers/md/dm-exception-store.h
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@@ -11,6 +11,7 @@
#define _LINUX_DM_EXCEPTION_STORE
#include <linux/blkdev.h>
#include <linux/device-mapper.h>
/*
* The snapshot code deals with largish chunks of the disk at a
@@ -37,7 +38,6 @@ struct dm_snap_exception {
* COW device).
*/
struct dm_exception_store {
/*
* Destroys this object when you've finished with it.
*/
@@ -45,9 +45,13 @@ struct dm_exception_store {
/*
* The target shouldn't read the COW device until this is
* called.
* called. As exceptions are read from the COW, they are
* reported back via the callback.
*/
int (*read_metadata) (struct dm_exception_store *store);
int (*read_metadata) (struct dm_exception_store *store,
int (*callback)(void *callback_context,
chunk_t old, chunk_t new),
void *callback_context);
/*
* Find somewhere to store the next exception.
@@ -68,6 +72,9 @@ struct dm_exception_store {
*/
void (*drop_snapshot) (struct dm_exception_store *store);
int (*status) (struct dm_exception_store *store, status_type_t status,
char *result, unsigned int maxlen);
/*
* Return how full the snapshot is.
*/