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| author | Jonathan Brassow <jbrassow@redhat.com> | 2009-01-06 04:05:19 +0100 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2009-01-06 04:05:19 +0100 |
| commit | a159c1ac5f33c6cf0f5aa3c9d1ccdc82c907ee46 (patch) | |
| tree | 2cb6bfd3f376e2366f3e3820ebd07a0a86a01cfc /drivers/md/dm-exception-store.h | |
| parent | dm snapshot: split out exception store implementations (diff) | |
| download | linux-a159c1ac5f33c6cf0f5aa3c9d1ccdc82c907ee46.tar.xz linux-a159c1ac5f33c6cf0f5aa3c9d1ccdc82c907ee46.zip | |
dm snapshot: extend exception store functions
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>
Diffstat (limited to 'drivers/md/dm-exception-store.h')
| -rw-r--r-- | drivers/md/dm-exception-store.h | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/drivers/md/dm-exception-store.h b/drivers/md/dm-exception-store.h index 78d1acec77e9..bb9f33d5daa2 100644 --- a/drivers/md/dm-exception-store.h +++ b/drivers/md/dm-exception-store.h @@ -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. */ |