qemu

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write-threshold.h (1297B)

      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