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path: root/drivers/md/dm-snap.c
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Diffstat (limited to 'drivers/md/dm-snap.c')
-rw-r--r--drivers/md/dm-snap.c48
1 files changed, 28 insertions, 20 deletions
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index 6c96db26b87..65ff82ff124 100644
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -9,6 +9,7 @@
#include <linux/blkdev.h>
#include <linux/ctype.h>
#include <linux/device-mapper.h>
+#include <linux/delay.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/kdev_t.h>
@@ -20,6 +21,7 @@
#include <linux/log2.h>
#include <linux/dm-kcopyd.h>
+#include "dm-exception-store.h"
#include "dm-snap.h"
#include "dm-bio-list.h"
@@ -428,8 +430,13 @@ out:
list_add(&new_e->hash_list, e ? &e->hash_list : l);
}
-int dm_add_exception(struct dm_snapshot *s, chunk_t old, chunk_t new)
+/*
+ * Callback used by the exception stores to load exceptions when
+ * initialising.
+ */
+static int dm_add_exception(void *context, chunk_t old, chunk_t new)
{
+ struct dm_snapshot *s = context;
struct dm_snap_exception *e;
e = alloc_exception();
@@ -658,7 +665,7 @@ static int snapshot_ctr(struct dm_target *ti, unsigned int argc, char **argv)
spin_lock_init(&s->tracked_chunk_lock);
/* Metadata must only be loaded into one table at once */
- r = s->store.read_metadata(&s->store);
+ r = s->store.read_metadata(&s->store, dm_add_exception, (void *)s);
if (r < 0) {
ti->error = "Failed to read snapshot metadata";
goto bad_load_and_register;
@@ -735,7 +742,7 @@ static void snapshot_dtr(struct dm_target *ti)
unregister_snapshot(s);
while (atomic_read(&s->pending_exceptions_count))
- yield();
+ msleep(1);
/*
* Ensure instructions in mempool_destroy aren't reordered
* before atomic_read.
@@ -888,10 +895,10 @@ static void pending_complete(struct dm_snap_pending_exception *pe, int success)
/*
* Check for conflicting reads. This is extremely improbable,
- * so yield() is sufficient and there is no need for a wait queue.
+ * so msleep(1) is sufficient and there is no need for a wait queue.
*/
while (__chunk_is_tracked(s, pe->e.old_chunk))
- yield();
+ msleep(1);
/*
* Add a proper exception, and remove the
@@ -1404,6 +1411,12 @@ static int __init dm_snapshot_init(void)
{
int r;
+ r = dm_exception_store_init();
+ if (r) {
+ DMERR("Failed to initialize exception stores");
+ return r;
+ }
+
r = dm_register_target(&snapshot_target);
if (r) {
DMERR("snapshot target register failed %d", r);
@@ -1452,39 +1465,34 @@ static int __init dm_snapshot_init(void)
return 0;
- bad_pending_pool:
+bad_pending_pool:
kmem_cache_destroy(tracked_chunk_cache);
- bad5:
+bad5:
kmem_cache_destroy(pending_cache);
- bad4:
+bad4:
kmem_cache_destroy(exception_cache);
- bad3:
+bad3:
exit_origin_hash();
- bad2:
+bad2:
dm_unregister_target(&origin_target);
- bad1:
+bad1:
dm_unregister_target(&snapshot_target);
return r;
}
static void __exit dm_snapshot_exit(void)
{
- int r;
-
destroy_workqueue(ksnapd);
- r = dm_unregister_target(&snapshot_target);
- if (r)
- DMERR("snapshot unregister failed %d", r);
-
- r = dm_unregister_target(&origin_target);
- if (r)
- DMERR("origin unregister failed %d", r);
+ dm_unregister_target(&snapshot_target);
+ dm_unregister_target(&origin_target);
exit_origin_hash();
kmem_cache_destroy(pending_cache);
kmem_cache_destroy(exception_cache);
kmem_cache_destroy(tracked_chunk_cache);
+
+ dm_exception_store_exit();
}
/* Module hooks */