#include <linux/workqueue.h>
#include "dm-exception-store.h"
-#include "dm-bio-list.h"
#define DM_MSG_PREFIX "snapshots"
ti->private = s;
ti->split_io = s->store->chunk_size;
+ ti->num_flush_requests = 1;
return 0;
chunk_t chunk;
struct dm_snap_pending_exception *pe = NULL;
+ if (unlikely(bio_empty_barrier(bio))) {
+ bio->bi_bdev = s->store->cow->bdev;
+ return DM_MAPIO_REMAPPED;
+ }
+
chunk = sector_to_chunk(s->store, bio->bi_sector);
/* Full snapshots are not usable */
return 0;
}
+static int snapshot_iterate_devices(struct dm_target *ti,
+ iterate_devices_callout_fn fn, void *data)
+{
+ struct dm_snapshot *snap = ti->private;
+
+ return fn(ti, snap->origin, 0, ti->len, data);
+}
+
+
/*-----------------------------------------------------------------
* Origin methods
*---------------------------------------------------------------*/
}
ti->private = dev;
+ ti->num_flush_requests = 1;
+
return 0;
}
struct dm_dev *dev = ti->private;
bio->bi_bdev = dev->bdev;
+ if (unlikely(bio_empty_barrier(bio)))
+ return DM_MAPIO_REMAPPED;
+
/* Only tell snapshots if this is a write */
return (bio_rw(bio) == WRITE) ? do_origin(dev, bio) : DM_MAPIO_REMAPPED;
}
return 0;
}
+static int origin_iterate_devices(struct dm_target *ti,
+ iterate_devices_callout_fn fn, void *data)
+{
+ struct dm_dev *dev = ti->private;
+
+ return fn(ti, dev, 0, ti->len, data);
+}
+
static struct target_type origin_target = {
.name = "snapshot-origin",
- .version = {1, 6, 0},
+ .version = {1, 7, 0},
.module = THIS_MODULE,
.ctr = origin_ctr,
.dtr = origin_dtr,
.map = origin_map,
.resume = origin_resume,
.status = origin_status,
+ .iterate_devices = origin_iterate_devices,
};
static struct target_type snapshot_target = {
.name = "snapshot",
- .version = {1, 6, 0},
+ .version = {1, 7, 0},
.module = THIS_MODULE,
.ctr = snapshot_ctr,
.dtr = snapshot_dtr,
.end_io = snapshot_end_io,
.resume = snapshot_resume,
.status = snapshot_status,
+ .iterate_devices = snapshot_iterate_devices,
};
static int __init dm_snapshot_init(void)