| 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 |