Lines Matching refs:snap
210 struct dm_snapshot *snap;
448 static int __find_snapshots_sharing_cow(struct dm_snapshot *snap,
458 o = __lookup_origin(snap->origin->bdev);
465 if (!bdev_equal(s->cow->bdev, snap->cow->bdev))
489 static int __validate_exception_handover(struct dm_snapshot *snap)
495 if ((__find_snapshots_sharing_cow(snap, &snap_src, &snap_dest,
498 snap->ti->error = "Snapshot cow pairing for exception table handover failed";
503 * If no snap_src was found, snap cannot become a handover
512 if (!dm_target_is_snapshot_merge(snap->ti))
519 snap->ti->error = "A snapshot is already merging.";
525 snap->ti->error = "Snapshot exception store does not support snapshot-merge.";
551 static int register_snapshot(struct dm_snapshot *snap)
554 struct block_device *bdev = snap->origin->bdev;
563 r = __validate_exception_handover(snap);
583 __insert_snapshot(o, snap);
746 pe->snap = s;
753 struct dm_snapshot *s = pe->snap;
855 struct dm_snapshot *snap;
859 list_for_each_entry(snap, &o->snapshots, list)
861 snap->store->chunk_size);
1453 snap_dest->store->snap = snap_dest;
1454 snap_src->store->snap = snap_src;
1645 struct dm_snapshot *s = pe->snap;
1731 struct dm_snapshot *s = pe->snap;
1745 struct dm_snapshot *s = pe->snap;
1794 struct dm_snapshot *s = pe->snap;
1824 struct dm_snapshot *s = pe->snap;
2317 struct dm_snapshot *snap = ti->private;
2323 down_write(&snap->lock);
2325 if (!snap->valid)
2327 else if (snap->merge_failed)
2329 else if (snap->snapshot_overflowed)
2332 if (snap->store->type->usage) {
2335 snap->store->type->usage(snap->store,
2347 up_write(&snap->lock);
2357 DMEMIT("%s %s", snap->origin->name, snap->cow->name);
2358 sz += snap->store->type->status(snap->store, type, result + sz,
2360 num_features = snap->discard_zeroes_cow + snap->discard_passdown_origin;
2363 if (snap->discard_zeroes_cow)
2365 if (snap->discard_passdown_origin)
2372 DMEMIT(",snap_origin_name=%s", snap->origin->name);
2373 DMEMIT(",snap_cow_name=%s", snap->cow->name);
2374 DMEMIT(",snap_valid=%c", snap->valid ? 'y' : 'n');
2375 DMEMIT(",snap_merge_failed=%c", snap->merge_failed ? 'y' : 'n');
2376 DMEMIT(",snapshot_overflowed=%c", snap->snapshot_overflowed ? 'y' : 'n');
2385 struct dm_snapshot *snap = ti->private;
2388 r = fn(ti, snap->origin, 0, ti->len, data);
2391 r = fn(ti, snap->cow, 0, get_dev_size(snap->cow->bdev), data);
2398 struct dm_snapshot *snap = ti->private;
2400 if (snap->discard_zeroes_cow) {
2405 (void) __find_snapshots_sharing_cow(snap, &snap_src, &snap_dest, NULL);
2407 snap = snap_src;
2410 limits->discard_granularity = snap->store->chunk_size;
2411 limits->max_discard_sectors = snap->store->chunk_size;
2436 struct dm_snapshot *snap;
2445 list_for_each_entry(snap, snapshots, list) {
2450 if (dm_target_is_snapshot_merge(snap->ti))
2454 if (sector >= dm_table_get_size(snap->ti->table))
2461 chunk = sector_to_chunk(snap->store, sector);
2462 dm_exception_table_lock_init(snap, chunk, &lock);
2464 down_read(&snap->lock);
2468 if (!snap->valid || !snap->active)
2471 pe = __lookup_pending_exception(snap, chunk);
2478 e = dm_lookup_exception(&snap->complete, chunk);
2483 pe = alloc_pending_exception(snap);
2486 pe2 = __lookup_pending_exception(snap, chunk);
2489 e = dm_lookup_exception(&snap->complete, chunk);
2495 pe = __insert_pending_exception(snap, pe, chunk);
2498 up_read(&snap->lock);
2500 invalidate_snapshot(snap, -ENOMEM);
2533 up_read(&snap->lock);