1 /* 2 * QEMU System Emulator block write threshold notification 3 * 4 * Copyright Red Hat, Inc. 2014 5 * 6 * Authors: 7 * Francesco Romani <fromani@redhat.com> 8 * 9 * This work is licensed under the terms of the GNU LGPL, version 2 or later. 10 * See the COPYING.LIB file in the top-level directory. 11 */ 12 13 #ifndef BLOCK_WRITE_THRESHOLD_H 14 #define BLOCK_WRITE_THRESHOLD_H 15 16 /* 17 * bdrv_write_threshold_set: 18 * 19 * Set the write threshold for block devices, in bytes. 20 * Notify when a write exceeds the threshold, meaning the device 21 * is becoming full, so it can be transparently resized. 22 * To be used with thin-provisioned block devices. 23 * 24 * Use threshold_bytes == 0 to disable. 25 */ 26 void bdrv_write_threshold_set(BlockDriverState *bs, uint64_t threshold_bytes); 27 28 /* 29 * bdrv_write_threshold_get 30 * 31 * Get the configured write threshold, in bytes. 32 * Zero means no threshold configured. 33 */ 34 uint64_t bdrv_write_threshold_get(const BlockDriverState *bs); 35 36 /* 37 * bdrv_write_threshold_check_write 38 * 39 * Check whether the specified request exceeds the write threshold. 40 * If so, send a corresponding event and disable write threshold checking. 41 */ 42 void bdrv_write_threshold_check_write(BlockDriverState *bs, int64_t offset, 43 int64_t bytes); 44 45 #endif 46