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Diffstat (limited to 'qemu/include/sysemu/block-backend.h')
| -rw-r--r-- | qemu/include/sysemu/block-backend.h | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/qemu/include/sysemu/block-backend.h b/qemu/include/sysemu/block-backend.h new file mode 100644 index 000000000..8fc960fcb --- /dev/null +++ b/qemu/include/sysemu/block-backend.h @@ -0,0 +1,173 @@ +/* + * QEMU Block backends + * + * Copyright (C) 2014 Red Hat, Inc. + * + * Authors: + * Markus Armbruster <armbru@redhat.com>, + * + * This work is licensed under the terms of the GNU LGPL, version 2.1 + * or later. See the COPYING.LIB file in the top-level directory. + */ + +#ifndef BLOCK_BACKEND_H +#define BLOCK_BACKEND_H + +#include "qemu/typedefs.h" +#include "qapi/error.h" + +/* + * TODO Have to include block/block.h for a bunch of block layer + * types. Unfortunately, this pulls in the whole BlockDriverState + * API, which we don't want used by many BlockBackend users. Some of + * the types belong here, and the rest should be split into a common + * header and one for the BlockDriverState API. + */ +#include "block/block.h" + +/* Callbacks for block device models */ +typedef struct BlockDevOps { + /* + * Runs when virtual media changed (monitor commands eject, change) + * Argument load is true on load and false on eject. + * Beware: doesn't run when a host device's physical media + * changes. Sure would be useful if it did. + * Device models with removable media must implement this callback. + */ + void (*change_media_cb)(void *opaque, bool load); + /* + * Runs when an eject request is issued from the monitor, the tray + * is closed, and the medium is locked. + * Device models that do not implement is_medium_locked will not need + * this callback. Device models that can lock the medium or tray might + * want to implement the callback and unlock the tray when "force" is + * true, even if they do not support eject requests. + */ + void (*eject_request_cb)(void *opaque, bool force); + /* + * Is the virtual tray open? + * Device models implement this only when the device has a tray. + */ + bool (*is_tray_open)(void *opaque); + /* + * Is the virtual medium locked into the device? + * Device models implement this only when device has such a lock. + */ + bool (*is_medium_locked)(void *opaque); + /* + * Runs when the size changed (e.g. monitor command block_resize) + */ + void (*resize_cb)(void *opaque); +} BlockDevOps; + +BlockBackend *blk_new(const char *name, Error **errp); +BlockBackend *blk_new_with_bs(const char *name, Error **errp); +BlockBackend *blk_new_open(const char *name, const char *filename, + const char *reference, QDict *options, int flags, + Error **errp); +void blk_ref(BlockBackend *blk); +void blk_unref(BlockBackend *blk); +const char *blk_name(BlockBackend *blk); +BlockBackend *blk_by_name(const char *name); +BlockBackend *blk_next(BlockBackend *blk); + +BlockDriverState *blk_bs(BlockBackend *blk); + +void blk_hide_on_behalf_of_hmp_drive_del(BlockBackend *blk); + +void blk_iostatus_enable(BlockBackend *blk); +int blk_attach_dev(BlockBackend *blk, void *dev); +void blk_attach_dev_nofail(BlockBackend *blk, void *dev); +void blk_detach_dev(BlockBackend *blk, void *dev); +void *blk_get_attached_dev(BlockBackend *blk); +void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops, void *opaque); +int blk_read(BlockBackend *blk, int64_t sector_num, uint8_t *buf, + int nb_sectors); +int blk_read_unthrottled(BlockBackend *blk, int64_t sector_num, uint8_t *buf, + int nb_sectors); +int blk_write(BlockBackend *blk, int64_t sector_num, const uint8_t *buf, + int nb_sectors); +int blk_write_zeroes(BlockBackend *blk, int64_t sector_num, + int nb_sectors, BdrvRequestFlags flags); +BlockAIOCB *blk_aio_write_zeroes(BlockBackend *blk, int64_t sector_num, + int nb_sectors, BdrvRequestFlags flags, + BlockCompletionFunc *cb, void *opaque); +int blk_pread(BlockBackend *blk, int64_t offset, void *buf, int count); +int blk_pwrite(BlockBackend *blk, int64_t offset, const void *buf, int count); +int64_t blk_getlength(BlockBackend *blk); +void blk_get_geometry(BlockBackend *blk, uint64_t *nb_sectors_ptr); +int64_t blk_nb_sectors(BlockBackend *blk); +BlockAIOCB *blk_aio_readv(BlockBackend *blk, int64_t sector_num, + QEMUIOVector *iov, int nb_sectors, + BlockCompletionFunc *cb, void *opaque); +BlockAIOCB *blk_aio_writev(BlockBackend *blk, int64_t sector_num, + QEMUIOVector *iov, int nb_sectors, + BlockCompletionFunc *cb, void *opaque); +BlockAIOCB *blk_aio_flush(BlockBackend *blk, + BlockCompletionFunc *cb, void *opaque); +BlockAIOCB *blk_aio_discard(BlockBackend *blk, + int64_t sector_num, int nb_sectors, + BlockCompletionFunc *cb, void *opaque); +void blk_aio_cancel(BlockAIOCB *acb); +void blk_aio_cancel_async(BlockAIOCB *acb); +int blk_aio_multiwrite(BlockBackend *blk, BlockRequest *reqs, int num_reqs); +int blk_ioctl(BlockBackend *blk, unsigned long int req, void *buf); +BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf, + BlockCompletionFunc *cb, void *opaque); +int blk_co_discard(BlockBackend *blk, int64_t sector_num, int nb_sectors); +int blk_co_flush(BlockBackend *blk); +int blk_flush(BlockBackend *blk); +int blk_flush_all(void); +void blk_drain(BlockBackend *blk); +void blk_drain_all(void); +BlockdevOnError blk_get_on_error(BlockBackend *blk, bool is_read); +BlockErrorAction blk_get_error_action(BlockBackend *blk, bool is_read, + int error); +void blk_error_action(BlockBackend *blk, BlockErrorAction action, + bool is_read, int error); +int blk_is_read_only(BlockBackend *blk); +int blk_is_sg(BlockBackend *blk); +int blk_enable_write_cache(BlockBackend *blk); +void blk_set_enable_write_cache(BlockBackend *blk, bool wce); +void blk_invalidate_cache(BlockBackend *blk, Error **errp); +int blk_is_inserted(BlockBackend *blk); +void blk_lock_medium(BlockBackend *blk, bool locked); +void blk_eject(BlockBackend *blk, bool eject_flag); +int blk_get_flags(BlockBackend *blk); +int blk_get_max_transfer_length(BlockBackend *blk); +void blk_set_guest_block_size(BlockBackend *blk, int align); +void *blk_blockalign(BlockBackend *blk, size_t size); +bool blk_op_is_blocked(BlockBackend *blk, BlockOpType op, Error **errp); +void blk_op_unblock(BlockBackend *blk, BlockOpType op, Error *reason); +void blk_op_block_all(BlockBackend *blk, Error *reason); +void blk_op_unblock_all(BlockBackend *blk, Error *reason); +AioContext *blk_get_aio_context(BlockBackend *blk); +void blk_set_aio_context(BlockBackend *blk, AioContext *new_context); +void blk_add_aio_context_notifier(BlockBackend *blk, + void (*attached_aio_context)(AioContext *new_context, void *opaque), + void (*detach_aio_context)(void *opaque), void *opaque); +void blk_remove_aio_context_notifier(BlockBackend *blk, + void (*attached_aio_context)(AioContext *, + void *), + void (*detach_aio_context)(void *), + void *opaque); +void blk_add_close_notifier(BlockBackend *blk, Notifier *notify); +void blk_io_plug(BlockBackend *blk); +void blk_io_unplug(BlockBackend *blk); +BlockAcctStats *blk_get_stats(BlockBackend *blk); + +void *blk_aio_get(const AIOCBInfo *aiocb_info, BlockBackend *blk, + BlockCompletionFunc *cb, void *opaque); +int coroutine_fn blk_co_write_zeroes(BlockBackend *blk, int64_t sector_num, + int nb_sectors, BdrvRequestFlags flags); +int blk_write_compressed(BlockBackend *blk, int64_t sector_num, + const uint8_t *buf, int nb_sectors); +int blk_truncate(BlockBackend *blk, int64_t offset); +int blk_discard(BlockBackend *blk, int64_t sector_num, int nb_sectors); +int blk_save_vmstate(BlockBackend *blk, const uint8_t *buf, + int64_t pos, int size); +int blk_load_vmstate(BlockBackend *blk, uint8_t *buf, int64_t pos, int size); +int blk_probe_blocksizes(BlockBackend *blk, BlockSizes *bsz); +int blk_probe_geometry(BlockBackend *blk, HDGeometry *geo); + +#endif |