#define RUNNING_MERGE 0
#define SHUTDOWN_MERGE 1
+struct dm_dev *dm_snap_origin(struct dm_snapshot *s)
+{
+ return s->origin;
+}
+EXPORT_SYMBOL(dm_snap_origin);
+
struct dm_dev *dm_snap_cow(struct dm_snapshot *s)
{
return s->cow;
return 0;
}
-#define min_not_zero(l, r) (((l) == 0) ? (r) : (((r) == 0) ? (l) : min(l, r)))
-
/*
* Return a minimum chunk size of all snapshots that have the specified origin.
* Return zero if the origin has no snapshots.
origin_mode = FMODE_WRITE;
}
- origin_path = argv[0];
- argv++;
- argc--;
-
s = kmalloc(sizeof(*s), GFP_KERNEL);
if (!s) {
ti->error = "Cannot allocate snapshot context private "
goto bad;
}
+ origin_path = argv[0];
+ argv++;
+ argc--;
+
+ r = dm_get_device(ti, origin_path, origin_mode, &s->origin);
+ if (r) {
+ ti->error = "Cannot get origin device";
+ goto bad_origin;
+ }
+
cow_path = argv[0];
argv++;
argc--;
argv += args_used;
argc -= args_used;
- r = dm_get_device(ti, origin_path, origin_mode, &s->origin);
- if (r) {
- ti->error = "Cannot get origin device";
- goto bad_origin;
- }
-
s->ti = ti;
s->valid = 1;
s->active = 0;
dm_exception_table_exit(&s->complete, exception_cache);
bad_hash_tables:
- dm_put_device(ti, s->origin);
-
-bad_origin:
dm_exception_store_destroy(s->store);
bad_store:
dm_put_device(ti, s->cow);
bad_cow:
+ dm_put_device(ti, s->origin);
+
+bad_origin:
kfree(s);
bad:
mempool_destroy(s->pending_pool);
- dm_put_device(ti, s->origin);
-
dm_exception_store_destroy(s->store);
dm_put_device(ti, s->cow);
+ dm_put_device(ti, s->origin);
+
kfree(s);
}
chunk_t chunk;
if (unlikely(bio_empty_barrier(bio))) {
- if (!map_context->flush_request)
+ if (!map_context->target_request_nr)
bio->bi_bdev = s->origin->bdev;
else
bio->bi_bdev = s->cow->bdev;
iterate_devices_callout_fn fn, void *data)
{
struct dm_snapshot *snap = ti->private;
+ int r;
+
+ r = fn(ti, snap->origin, 0, ti->len, data);
+
+ if (!r)
+ r = fn(ti, snap->cow, 0, get_dev_size(snap->cow->bdev), data);
- return fn(ti, snap->origin, 0, ti->len, data);
+ return r;
}
return 0;
}
+static int origin_merge(struct dm_target *ti, struct bvec_merge_data *bvm,
+ struct bio_vec *biovec, int max_size)
+{
+ struct dm_dev *dev = ti->private;
+ struct request_queue *q = bdev_get_queue(dev->bdev);
+
+ if (!q->merge_bvec_fn)
+ return max_size;
+
+ bvm->bi_bdev = dev->bdev;
+ bvm->bi_sector = bvm->bi_sector;
+
+ return min(max_size, q->merge_bvec_fn(q, bvm, biovec));
+}
+
static int origin_iterate_devices(struct dm_target *ti,
iterate_devices_callout_fn fn, void *data)
{
.map = origin_map,
.resume = origin_resume,
.status = origin_status,
+ .merge = origin_merge,
.iterate_devices = origin_iterate_devices,
};