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authorMike Snitzer <snitzer@redhat.com>2009-04-02 19:55:30 +0100
committerAlasdair G Kergon <agk@redhat.com>2009-04-02 19:55:30 +0100
commitec44ab9d6681ddf9026b593e866bec9c0e075e1d (patch)
tree56c0f99068c7bf2a474e8094c1fa9d14a7861ae8
parent84e67c9319eb2232757a022c24f6a461291eaee5 (diff)
dm log: remove struct dm_dirty_log_internal
Remove the 'dm_dirty_log_internal' structure. The resulting cleanup eliminates extra memory allocations. Therefore exposing the internal list_head to the external 'dm_dirty_log_type' structure is a worthwhile compromise. Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
-rw-r--r--drivers/md/dm-log.c58
-rw-r--r--include/linux/dm-dirty-log.h3
2 files changed, 17 insertions, 44 deletions
diff --git a/drivers/md/dm-log.c b/drivers/md/dm-log.c
index 094c8f0e0097..be233bc4d917 100644
--- a/drivers/md/dm-log.c
+++ b/drivers/md/dm-log.c
@@ -16,34 +16,28 @@
#define DM_MSG_PREFIX "dirty region log"
-struct dm_dirty_log_internal {
- struct dm_dirty_log_type *type;
-
- struct list_head list;
-};
-
static LIST_HEAD(_log_types);
static DEFINE_SPINLOCK(_lock);
-static struct dm_dirty_log_internal *__find_dirty_log_type(const char *name)
+static struct dm_dirty_log_type *__find_dirty_log_type(const char *name)
{
- struct dm_dirty_log_internal *log_type;
+ struct dm_dirty_log_type *log_type;
list_for_each_entry(log_type, &_log_types, list)
- if (!strcmp(name, log_type->type->name))
+ if (!strcmp(name, log_type->name))
return log_type;
return NULL;
}
-static struct dm_dirty_log_internal *_get_dirty_log_type(const char *name)
+static struct dm_dirty_log_type *_get_dirty_log_type(const char *name)
{
- struct dm_dirty_log_internal *log_type;
+ struct dm_dirty_log_type *log_type;
spin_lock(&_lock);
log_type = __find_dirty_log_type(name);
- if (log_type && !try_module_get(log_type->type->module))
+ if (log_type && !try_module_get(log_type->module))
log_type = NULL;
spin_unlock(&_lock);
@@ -71,14 +65,14 @@ static struct dm_dirty_log_internal *_get_dirty_log_type(const char *name)
static struct dm_dirty_log_type *get_type(const char *type_name)
{
char *p, *type_name_dup;
- struct dm_dirty_log_internal *log_type;
+ struct dm_dirty_log_type *log_type;
if (!type_name)
return NULL;
log_type = _get_dirty_log_type(type_name);
if (log_type)
- return log_type->type;
+ return log_type;
type_name_dup = kstrdup(type_name, GFP_KERNEL);
if (!type_name_dup) {
@@ -100,19 +94,16 @@ static struct dm_dirty_log_type *get_type(const char *type_name)
kfree(type_name_dup);
- return log_type ? log_type->type : NULL;
+ return log_type;
}
static void put_type(struct dm_dirty_log_type *type)
{
- struct dm_dirty_log_internal *log_type;
-
if (!type)
return;
spin_lock(&_lock);
- log_type = __find_dirty_log_type(type->name);
- if (!log_type)
+ if (!__find_dirty_log_type(type->name))
goto out;
module_put(type->module);
@@ -121,32 +112,15 @@ out:
spin_unlock(&_lock);
}
-static struct dm_dirty_log_internal *_alloc_dirty_log_type(struct dm_dirty_log_type *type)
-{
- struct dm_dirty_log_internal *log_type = kzalloc(sizeof(*log_type),
- GFP_KERNEL);
-
- if (log_type)
- log_type->type = type;
-
- return log_type;
-}
-
int dm_dirty_log_type_register(struct dm_dirty_log_type *type)
{
- struct dm_dirty_log_internal *log_type = _alloc_dirty_log_type(type);
int r = 0;
- if (!log_type)
- return -ENOMEM;
-
spin_lock(&_lock);
if (!__find_dirty_log_type(type->name))
- list_add(&log_type->list, &_log_types);
- else {
- kfree(log_type);
+ list_add(&type->list, &_log_types);
+ else
r = -EEXIST;
- }
spin_unlock(&_lock);
return r;
@@ -155,20 +129,16 @@ EXPORT_SYMBOL(dm_dirty_log_type_register);
int dm_dirty_log_type_unregister(struct dm_dirty_log_type *type)
{
- struct dm_dirty_log_internal *log_type;
-
spin_lock(&_lock);
- log_type = __find_dirty_log_type(type->name);
- if (!log_type) {
+ if (!__find_dirty_log_type(type->name)) {
spin_unlock(&_lock);
return -EINVAL;
}
- list_del(&log_type->list);
+ list_del(&type->list);
spin_unlock(&_lock);
- kfree(log_type);
return 0;
}
diff --git a/include/linux/dm-dirty-log.h b/include/linux/dm-dirty-log.h
index 600c5fb2daad..727602b686d4 100644
--- a/include/linux/dm-dirty-log.h
+++ b/include/linux/dm-dirty-log.h
@@ -28,6 +28,9 @@ struct dm_dirty_log_type {
const char *name;
struct module *module;
+ /* For internal device-mapper use */
+ struct list_head list;
+
int (*ctr)(struct dm_dirty_log *log, struct dm_target *ti,
unsigned argc, char **argv);
void (*dtr)(struct dm_dirty_log *log);