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 #include "qemu/typedefs.h" 17 18 /* 19 * bdrv_write_threshold_set: 20 * 21 * Set the write threshold for block devices, in bytes. 22 * Notify when a write exceeds the threshold, meaning the device 23 * is becoming full, so it can be transparently resized. 24 * To be used with thin-provisioned block devices. 25 * 26 * Use threshold_bytes == 0 to disable. 27 */ 28 void bdrv_write_threshold_set(BlockDriverState *bs, uint64_t threshold_bytes); 29 30 /* 31 * bdrv_write_threshold_get 32 * 33 * Get the configured write threshold, in bytes. 34 * Zero means no threshold configured. 35 */ 36 uint64_t bdrv_write_threshold_get(const BlockDriverState *bs); 37 38 /* 39 * bdrv_write_threshold_check_write 40 * 41 * Check whether the specified request exceeds the write threshold. 42 * If so, send a corresponding event and disable write threshold checking. 43 */ 44 void bdrv_write_threshold_check_write(BlockDriverState *bs, int64_t offset, 45 int64_t bytes); 46 47 #endif 48