LXR qemu/include/sysemu/block-backend.h

   1/*
   2 * QEMU Block backends
   3 *
   4 * Copyright (C) 2014 Red Hat, Inc.
   5 *
   6 * Authors:
   7 *  Markus Armbruster <armbru@redhat.com>,
   8 *
   9 * This work is licensed under the terms of the GNU LGPL, version 2.1
  10 * or later.  See the COPYING.LIB file in the top-level directory.
  11 */
  12
  13#ifndef BLOCK_BACKEND_H
  14#define BLOCK_BACKEND_H
  15
  16#include "qemu/typedefs.h"
  17#include "qapi/error.h"
  18
  19/*
  20 * TODO Have to include block/block.h for a bunch of block layer
  21 * types.  Unfortunately, this pulls in the whole BlockDriverState
  22 * API, which we don't want used by many BlockBackend users.  Some of
  23 * the types belong here, and the rest should be split into a common
  24 * header and one for the BlockDriverState API.
  25 */
  26#include "block/block.h"
  27
  28/* Callbacks for block device models */
  29typedef struct BlockDevOps {
  30    /*
  31     * Runs when virtual media changed (monitor commands eject, change)
  32     * Argument load is true on load and false on eject.
  33     * Beware: doesn't run when a host device's physical media
  34     * changes.  Sure would be useful if it did.
  35     * Device models with removable media must implement this callback.
  36     */
  37    void (*change_media_cb)(void *opaque, bool load);
  38    /*
  39     * Runs when an eject request is issued from the monitor, the tray
  40     * is closed, and the medium is locked.
  41     * Device models that do not implement is_medium_locked will not need
  42     * this callback.  Device models that can lock the medium or tray might
  43     * want to implement the callback and unlock the tray when "force" is
  44     * true, even if they do not support eject requests.
  45     */
  46    void (*eject_request_cb)(void *opaque, bool force);
  47    /*
  48     * Is the virtual tray open?
  49     * Device models implement this only when the device has a tray.
  50     */
  51    bool (*is_tray_open)(void *opaque);
  52    /*
  53     * Is the virtual medium locked into the device?
  54     * Device models implement this only when device has such a lock.
  55     */
  56    bool (*is_medium_locked)(void *opaque);
  57    /*
  58     * Runs when the size changed (e.g. monitor command block_resize)
  59     */
  60    void (*resize_cb)(void *opaque);
  61} BlockDevOps;
  62
  63BlockBackend *blk_new(const char *name, Error **errp);
  64BlockBackend *blk_new_with_bs(const char *name, Error **errp);
  65BlockBackend *blk_new_open(const char *name, const char *filename,
  66                           const char *reference, QDict *options, int flags,
  67                           Error **errp);
  68void blk_ref(BlockBackend *blk);
  69void blk_unref(BlockBackend *blk);
  70const char *blk_name(BlockBackend *blk);
  71BlockBackend *blk_by_name(const char *name);
  72BlockBackend *blk_next(BlockBackend *blk);
  73
  74BlockDriverState *blk_bs(BlockBackend *blk);
  75
  76void blk_hide_on_behalf_of_hmp_drive_del(BlockBackend *blk);
  77
  78void blk_iostatus_enable(BlockBackend *blk);
  79int blk_attach_dev(BlockBackend *blk, void *dev);
  80void blk_attach_dev_nofail(BlockBackend *blk, void *dev);
  81void blk_detach_dev(BlockBackend *blk, void *dev);
  82void *blk_get_attached_dev(BlockBackend *blk);
  83void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops, void *opaque);
  84int blk_read(BlockBackend *blk, int64_t sector_num, uint8_t *buf,
  85             int nb_sectors);
  86int blk_read_unthrottled(BlockBackend *blk, int64_t sector_num, uint8_t *buf,
  87                         int nb_sectors);
  88int blk_write(BlockBackend *blk, int64_t sector_num, const uint8_t *buf,
  89              int nb_sectors);
  90int blk_write_zeroes(BlockBackend *blk, int64_t sector_num,
  91                     int nb_sectors, BdrvRequestFlags flags);
  92BlockAIOCB *blk_aio_write_zeroes(BlockBackend *blk, int64_t sector_num,
  93                                 int nb_sectors, BdrvRequestFlags flags,
  94                                 BlockCompletionFunc *cb, void *opaque);
  95int blk_pread(BlockBackend *blk, int64_t offset, void *buf, int count);
  96int blk_pwrite(BlockBackend *blk, int64_t offset, const void *buf, int count);
  97int64_t blk_getlength(BlockBackend *blk);
  98void blk_get_geometry(BlockBackend *blk, uint64_t *nb_sectors_ptr);
  99int64_t blk_nb_sectors(BlockBackend *blk);
 100BlockAIOCB *blk_aio_readv(BlockBackend *blk, int64_t sector_num,
 101                          QEMUIOVector *iov, int nb_sectors,
 102                          BlockCompletionFunc *cb, void *opaque);
 103BlockAIOCB *blk_aio_writev(BlockBackend *blk, int64_t sector_num,
 104                           QEMUIOVector *iov, int nb_sectors,
 105                           BlockCompletionFunc *cb, void *opaque);
 106BlockAIOCB *blk_aio_flush(BlockBackend *blk,
 107                          BlockCompletionFunc *cb, void *opaque);
 108BlockAIOCB *blk_aio_discard(BlockBackend *blk,
 109                            int64_t sector_num, int nb_sectors,
 110                            BlockCompletionFunc *cb, void *opaque);
 111void blk_aio_cancel(BlockAIOCB *acb);
 112void blk_aio_cancel_async(BlockAIOCB *acb);
 113int blk_aio_multiwrite(BlockBackend *blk, BlockRequest *reqs, int num_reqs);
 114int blk_ioctl(BlockBackend *blk, unsigned long int req, void *buf);
 115BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf,
 116                          BlockCompletionFunc *cb, void *opaque);
 117int blk_co_discard(BlockBackend *blk, int64_t sector_num, int nb_sectors);
 118int blk_co_flush(BlockBackend *blk);
 119int blk_flush(BlockBackend *blk);
 120int blk_flush_all(void);
 121void blk_drain(BlockBackend *blk);
 122void blk_drain_all(void);
 123BlockdevOnError blk_get_on_error(BlockBackend *blk, bool is_read);
 124BlockErrorAction blk_get_error_action(BlockBackend *blk, bool is_read,
 125                                      int error);
 126void blk_error_action(BlockBackend *blk, BlockErrorAction action,
 127                      bool is_read, int error);
 128int blk_is_read_only(BlockBackend *blk);
 129int blk_is_sg(BlockBackend *blk);
 130int blk_enable_write_cache(BlockBackend *blk);
 131void blk_set_enable_write_cache(BlockBackend *blk, bool wce);
 132void blk_invalidate_cache(BlockBackend *blk, Error **errp);
 133int blk_is_inserted(BlockBackend *blk);
 134void blk_lock_medium(BlockBackend *blk, bool locked);
 135void blk_eject(BlockBackend *blk, bool eject_flag);
 136int blk_get_flags(BlockBackend *blk);
 137int blk_get_max_transfer_length(BlockBackend *blk);
 138void blk_set_guest_block_size(BlockBackend *blk, int align);
 139void *blk_blockalign(BlockBackend *blk, size_t size);
 140bool blk_op_is_blocked(BlockBackend *blk, BlockOpType op, Error **errp);
 141void blk_op_unblock(BlockBackend *blk, BlockOpType op, Error *reason);
 142void blk_op_block_all(BlockBackend *blk, Error *reason);
 143void blk_op_unblock_all(BlockBackend *blk, Error *reason);
 144AioContext *blk_get_aio_context(BlockBackend *blk);
 145void blk_set_aio_context(BlockBackend *blk, AioContext *new_context);
 146void blk_add_aio_context_notifier(BlockBackend *blk,
 147        void (*attached_aio_context)(AioContext *new_context, void *opaque),
 148        void (*detach_aio_context)(void *opaque), void *opaque);
 149void blk_remove_aio_context_notifier(BlockBackend *blk,
 150                                     void (*attached_aio_context)(AioContext *,
 151                                                                  void *),
 152                                     void (*detach_aio_context)(void *),
 153                                     void *opaque);
 154void blk_add_close_notifier(BlockBackend *blk, Notifier *notify);
 155void blk_io_plug(BlockBackend *blk);
 156void blk_io_unplug(BlockBackend *blk);
 157BlockAcctStats *blk_get_stats(BlockBackend *blk);
 158
 159void *blk_aio_get(const AIOCBInfo *aiocb_info, BlockBackend *blk,
 160                  BlockCompletionFunc *cb, void *opaque);
 161int coroutine_fn blk_co_write_zeroes(BlockBackend *blk, int64_t sector_num,
 162                                     int nb_sectors, BdrvRequestFlags flags);
 163int blk_write_compressed(BlockBackend *blk, int64_t sector_num,
 164                         const uint8_t *buf, int nb_sectors);
 165int blk_truncate(BlockBackend *blk, int64_t offset);
 166int blk_discard(BlockBackend *blk, int64_t sector_num, int nb_sectors);
 167int blk_save_vmstate(BlockBackend *blk, const uint8_t *buf,
 168                     int64_t pos, int size);
 169int blk_load_vmstate(BlockBackend *blk, uint8_t *buf, int64_t pos, int size);
 170int blk_probe_blocksizes(BlockBackend *blk, BlockSizes *bsz);
 171int blk_probe_geometry(BlockBackend *blk, HDGeometry *geo);
 172
 173#endif
 174