projects / mirror_qemu.git / blame
| Commit | Line | Data |
|---|---|---|
| e2462113 FR |
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 | */ | |
| ec150c7e | 12 | |
| e2462113 FR |
13 | #ifndef BLOCK_WRITE_THRESHOLD_H |
| 14 | #define BLOCK_WRITE_THRESHOLD_H | |
| 15 | ||
| c61ebf36 | 16 | #include "qemu/typedefs.h" |
| e2462113 FR |
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 | ||
| 94783301 VSO |
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 | ||
| e2462113 | 47 | #endif |