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authorJonathan Brassow <jbrassow@redhat.com>2009-01-06 06:05:19 +0300
committerAlasdair G Kergon <agk@redhat.com>2009-01-06 06:05:19 +0300
commita159c1ac5f33c6cf0f5aa3c9d1ccdc82c907ee46 (patch)
tree2cb6bfd3f376e2366f3e3820ebd07a0a86a01cfc /drivers/md/dm-snap-persistent.c
parent4db6bfe02bdc7dc5048f46dd682a94801d029adc (diff)
downloadlinux-a159c1ac5f33c6cf0f5aa3c9d1ccdc82c907ee46.tar.xz
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-snap-persistent.c')
-rw-r--r--drivers/md/dm-snap-persistent.c42
1 files changed, 26 insertions, 16 deletions
diff --git a/drivers/md/dm-snap-persistent.c b/drivers/md/dm-snap-persistent.c
index 57c946c69ee7..936b34e0959f 100644
--- a/drivers/md/dm-snap-persistent.c
+++ b/drivers/md/dm-snap-persistent.c
@@ -395,7 +395,11 @@ static void write_exception(struct pstore *ps,
* 'full' is filled in to indicate if the area has been
* filled.
*/
-static int insert_exceptions(struct pstore *ps, int *full)
+static int insert_exceptions(struct pstore *ps,
+ int (*callback)(void *callback_context,
+ chunk_t old, chunk_t new),
+ void *callback_context,
+ int *full)
{
int r;
unsigned int i;
@@ -428,7 +432,7 @@ static int insert_exceptions(struct pstore *ps, int *full)
/*
* Otherwise we add the exception to the snapshot.
*/
- r = dm_add_exception(ps->snap, de.old_chunk, de.new_chunk);
+ r = callback(callback_context, de.old_chunk, de.new_chunk);
if (r)
return r;
}
@@ -436,7 +440,10 @@ static int insert_exceptions(struct pstore *ps, int *full)
return 0;
}
-static int read_exceptions(struct pstore *ps)
+static int read_exceptions(struct pstore *ps,
+ int (*callback)(void *callback_context, chunk_t old,
+ chunk_t new),
+ void *callback_context)
{
int r, full = 1;
@@ -449,7 +456,7 @@ static int read_exceptions(struct pstore *ps)
if (r)
return r;
- r = insert_exceptions(ps, &full);
+ r = insert_exceptions(ps, callback, callback_context, &full);
if (r)
return r;
}
@@ -482,7 +489,10 @@ static void persistent_destroy(struct dm_exception_store *store)
kfree(ps);
}
-static int persistent_read_metadata(struct dm_exception_store *store)
+static int persistent_read_metadata(struct dm_exception_store *store,
+ int (*callback)(void *callback_context,
+ chunk_t old, chunk_t new),
+ void *callback_context)
{
int r, uninitialized_var(new_snapshot);
struct pstore *ps = get_info(store);
@@ -540,7 +550,7 @@ static int persistent_read_metadata(struct dm_exception_store *store)
/*
* Read the metadata.
*/
- r = read_exceptions(ps);
+ r = read_exceptions(ps, callback, callback_context);
if (r)
return r;
}
@@ -548,8 +558,8 @@ static int persistent_read_metadata(struct dm_exception_store *store)
return 0;
}
-static int persistent_prepare(struct dm_exception_store *store,
- struct dm_snap_exception *e)
+static int persistent_prepare_exception(struct dm_exception_store *store,
+ struct dm_snap_exception *e)
{
struct pstore *ps = get_info(store);
uint32_t stride;
@@ -575,10 +585,10 @@ static int persistent_prepare(struct dm_exception_store *store,
return 0;
}
-static void persistent_commit(struct dm_exception_store *store,
- struct dm_snap_exception *e,
- void (*callback) (void *, int success),
- void *callback_context)
+static void persistent_commit_exception(struct dm_exception_store *store,
+ struct dm_snap_exception *e,
+ void (*callback) (void *, int success),
+ void *callback_context)
{
unsigned int i;
struct pstore *ps = get_info(store);
@@ -637,7 +647,7 @@ static void persistent_commit(struct dm_exception_store *store,
ps->callback_count = 0;
}
-static void persistent_drop(struct dm_exception_store *store)
+static void persistent_drop_snapshot(struct dm_exception_store *store)
{
struct pstore *ps = get_info(store);
@@ -675,9 +685,9 @@ int dm_create_persistent(struct dm_exception_store *store)
store->destroy = persistent_destroy;
store->read_metadata = persistent_read_metadata;
- store->prepare_exception = persistent_prepare;
- store->commit_exception = persistent_commit;
- store->drop_snapshot = persistent_drop;
+ store->prepare_exception = persistent_prepare_exception;
+ store->commit_exception = persistent_commit_exception;
+ store->drop_snapshot = persistent_drop_snapshot;
store->fraction_full = persistent_fraction_full;
store->context = ps;