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dm log: add flush callback fn

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Introduce a callback pointer from the log to dm-raid1 layer.

Before some region is set as "in-sync", we need to flush hardware cache on
all the disks. But the log module doesn't have access to the mirror_set
structure. So it will use this callback.

So far the callback is unused, it will be used in further patches.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Mikulas Patocka 2009-12-10 23:52:01 +00:00 committed by Alasdair G Kergon
parent 5adc78d0d2
commit 87a8f240e9
3 changed files with 9 additions and 5 deletions
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2
drivers/md/dm-log.c
View file

@ -146,6 +146,7 @@ EXPORT_SYMBOL(dm_dirty_log_type_unregister);
struct dm_dirty_log *dm_dirty_log_create(const char *type_name, struct dm_dirty_log *dm_dirty_log_create(const char *type_name,
struct dm_target *ti, struct dm_target *ti,
int (*flush_callback_fn)(struct dm_target *ti),
unsigned int argc, char **argv) unsigned int argc, char **argv)
{ {
struct dm_dirty_log_type *type; struct dm_dirty_log_type *type;
@ -161,6 +162,7 @@ struct dm_dirty_log *dm_dirty_log_create(const char *type_name,
return NULL; return NULL;
} }
log->flush_callback_fn = flush_callback_fn;
log->type = type; log->type = type;
if (type->ctr(log, ti, argc, argv)) { if (type->ctr(log, ti, argc, argv)) {
kfree(log); kfree(log);

2
drivers/md/dm-raid1.c
View file

@ -896,7 +896,7 @@ static struct dm_dirty_log *create_dirty_log(struct dm_target *ti,
return NULL; return NULL;
} }
dl = dm_dirty_log_create(argv[0], ti, param_count, argv + 2); dl = dm_dirty_log_create(argv[0], ti, NULL, param_count, argv + 2);
if (!dl) { if (!dl) {
ti->error = "Error creating mirror dirty log"; ti->error = "Error creating mirror dirty log";
return NULL; return NULL;

2
include/linux/dm-dirty-log.h
View file

@ -21,6 +21,7 @@ struct dm_dirty_log_type;
struct dm_dirty_log { struct dm_dirty_log {
struct dm_dirty_log_type *type; struct dm_dirty_log_type *type;
int (*flush_callback_fn)(struct dm_target *ti);
void *context; void *context;
}; };
@ -137,6 +138,7 @@ int dm_dirty_log_type_unregister(struct dm_dirty_log_type *type);
*/ */
struct dm_dirty_log *dm_dirty_log_create(const char *type_name, struct dm_dirty_log *dm_dirty_log_create(const char *type_name,
struct dm_target *ti, struct dm_target *ti,
int (*flush_callback_fn)(struct dm_target *ti),
unsigned argc, char **argv); unsigned argc, char **argv);
void dm_dirty_log_destroy(struct dm_dirty_log *log); void dm_dirty_log_destroy(struct dm_dirty_log *log);