/* * QEMU Block backends * * Copyright (C) 2014-2016 Red Hat, Inc. * * Authors: * Markus Armbruster , * * 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_IO_H #define BLOCK_BACKEND_IO_H #include "block-backend-common.h" #include "block/accounting.h" /* * I/O API functions. These functions are thread-safe. * * See include/block/block-io.h for more information about * the I/O API. */ const char *blk_name(const BlockBackend *blk); BlockDriverState *blk_bs(BlockBackend *blk); void blk_set_allow_write_beyond_eof(BlockBackend *blk, bool allow); void blk_set_allow_aio_context_change(BlockBackend *blk, bool allow); void blk_set_disable_request_queuing(BlockBackend *blk, bool disable); bool blk_iostatus_is_enabled(const BlockBackend *blk); char *blk_get_attached_dev_id(BlockBackend *blk); BlockAIOCB *blk_aio_pwrite_zeroes(BlockBackend *blk, int64_t offset, int64_t bytes, BdrvRequestFlags flags, BlockCompletionFunc *cb, void *opaque); BlockAIOCB *blk_aio_preadv(BlockBackend *blk, int64_t offset, QEMUIOVector *qiov, BdrvRequestFlags flags, BlockCompletionFunc *cb, void *opaque); BlockAIOCB *blk_aio_pwritev(BlockBackend *blk, int64_t offset, QEMUIOVector *qiov, BdrvRequestFlags flags, BlockCompletionFunc *cb, void *opaque); BlockAIOCB *blk_aio_flush(BlockBackend *blk, BlockCompletionFunc *cb, void *opaque); BlockAIOCB *blk_aio_pdiscard(BlockBackend *blk, int64_t offset, int64_t bytes, BlockCompletionFunc *cb, void *opaque); void blk_aio_cancel_async(BlockAIOCB *acb); BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf, BlockCompletionFunc *cb, void *opaque); void blk_inc_in_flight(BlockBackend *blk); void blk_dec_in_flight(BlockBackend *blk); bool coroutine_fn GRAPH_RDLOCK blk_co_is_inserted(BlockBackend *blk); bool co_wrapper_mixed_bdrv_rdlock blk_is_inserted(BlockBackend *blk); bool coroutine_fn GRAPH_RDLOCK blk_co_is_available(BlockBackend *blk); bool co_wrapper_mixed_bdrv_rdlock blk_is_available(BlockBackend *blk); void coroutine_fn blk_co_lock_medium(BlockBackend *blk, bool locked); void co_wrapper blk_lock_medium(BlockBackend *blk, bool locked); void coroutine_fn blk_co_eject(BlockBackend *blk, bool eject_flag); void co_wrapper blk_eject(BlockBackend *blk, bool eject_flag); int64_t coroutine_fn blk_co_getlength(BlockBackend *blk); int64_t co_wrapper_mixed blk_getlength(BlockBackend *blk); void coroutine_fn blk_co_get_geometry(BlockBackend *blk, uint64_t *nb_sectors_ptr); void blk_get_geometry(BlockBackend *blk, uint64_t *nb_sectors_ptr); int64_t coroutine_fn blk_co_nb_sectors(BlockBackend *blk); int64_t blk_nb_sectors(BlockBackend *blk); void *blk_try_blockalign(BlockBackend *blk, size_t size); void *blk_blockalign(BlockBackend *blk, size_t size); bool blk_is_writable(BlockBackend *blk); bool blk_enable_write_cache(BlockBackend *blk); 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); void blk_iostatus_set_err(BlockBackend *blk, int error); int blk_get_max_iov(BlockBackend *blk); int blk_get_max_hw_iov(BlockBackend *blk); /* * blk_io_plug/unplug are thread-local operations. This means that multiple * IOThreads can simultaneously call plug/unplug, but the caller must ensure * that each unplug() is called in the same IOThread of the matching plug(). */ void coroutine_fn blk_co_io_plug(BlockBackend *blk); void co_wrapper blk_io_plug(BlockBackend *blk); void coroutine_fn blk_co_io_unplug(BlockBackend *blk); void co_wrapper blk_io_unplug(BlockBackend *blk); AioContext *blk_get_aio_context(BlockBackend *blk); BlockAcctStats *blk_get_stats(BlockBackend *blk); void *blk_aio_get(const AIOCBInfo *aiocb_info, BlockBackend *blk, BlockCompletionFunc *cb, void *opaque); BlockAIOCB *blk_abort_aio_request(BlockBackend *blk, BlockCompletionFunc *cb, void *opaque, int ret); uint32_t blk_get_request_alignment(BlockBackend *blk); uint32_t blk_get_max_transfer(BlockBackend *blk); uint64_t blk_get_max_hw_transfer(BlockBackend *blk); int coroutine_fn blk_co_copy_range(BlockBackend *blk_in, int64_t off_in, BlockBackend *blk_out, int64_t off_out, int64_t bytes, BdrvRequestFlags read_flags, BdrvRequestFlags write_flags); int coroutine_fn blk_co_block_status_above(BlockBackend *blk, BlockDriverState *base, int64_t offset, int64_t bytes, int64_t *pnum, int64_t *map, BlockDriverState **file); int coroutine_fn blk_co_is_allocated_above(BlockBackend *blk, BlockDriverState *base, bool include_base, int64_t offset, int64_t bytes, int64_t *pnum); /* * "I/O or GS" API functions. These functions can run without * the BQL, but only in one specific iothread/main loop. * * See include/block/block-io.h for more information about * the "I/O or GS" API. */ int co_wrapper_mixed blk_pread(BlockBackend *blk, int64_t offset, int64_t bytes, void *buf, BdrvRequestFlags flags); int coroutine_fn blk_co_pread(BlockBackend *blk, int64_t offset, int64_t bytes, void *buf, BdrvRequestFlags flags); int co_wrapper_mixed blk_preadv(BlockBackend *blk, int64_t offset, int64_t bytes, QEMUIOVector *qiov, BdrvRequestFlags flags); int coroutine_fn blk_co_preadv(BlockBackend *blk, int64_t offset, int64_t bytes, QEMUIOVector *qiov, BdrvRequestFlags flags); int co_wrapper_mixed blk_preadv_part(BlockBackend *blk, int64_t offset, int64_t bytes, QEMUIOVector *qiov, size_t qiov_offset, BdrvRequestFlags flags); int coroutine_fn blk_co_preadv_part(BlockBackend *blk, int64_t offset, int64_t bytes, QEMUIOVector *qiov, size_t qiov_offset, BdrvRequestFlags flags); int co_wrapper_mixed blk_pwrite(BlockBackend *blk, int64_t offset, int64_t bytes, const void *buf, BdrvRequestFlags flags); int coroutine_fn blk_co_pwrite(BlockBackend *blk, int64_t offset, int64_t bytes, const void *buf, BdrvRequestFlags flags); int co_wrapper_mixed blk_pwritev(BlockBackend *blk, int64_t offset, int64_t bytes, QEMUIOVector *qiov, BdrvRequestFlags flags); int coroutine_fn blk_co_pwritev(BlockBackend *blk, int64_t offset, int64_t bytes, QEMUIOVector *qiov, BdrvRequestFlags flags); int co_wrapper_mixed blk_pwritev_part(BlockBackend *blk, int64_t offset, int64_t bytes, QEMUIOVector *qiov, size_t qiov_offset, BdrvRequestFlags flags); int coroutine_fn blk_co_pwritev_part(BlockBackend *blk, int64_t offset, int64_t bytes, QEMUIOVector *qiov, size_t qiov_offset, BdrvRequestFlags flags); int co_wrapper_mixed blk_pwrite_compressed(BlockBackend *blk, int64_t offset, int64_t bytes, const void *buf); int coroutine_fn blk_co_pwrite_compressed(BlockBackend *blk, int64_t offset, int64_t bytes, const void *buf); int co_wrapper_mixed blk_pwrite_zeroes(BlockBackend *blk, int64_t offset, int64_t bytes, BdrvRequestFlags flags); int coroutine_fn blk_co_pwrite_zeroes(BlockBackend *blk, int64_t offset, int64_t bytes, BdrvRequestFlags flags); int co_wrapper_mixed blk_pdiscard(BlockBackend *blk, int64_t offset, int64_t bytes); int coroutine_fn blk_co_pdiscard(BlockBackend *blk, int64_t offset, int64_t bytes); int co_wrapper_mixed blk_flush(BlockBackend *blk); int coroutine_fn blk_co_flush(BlockBackend *blk); int co_wrapper_mixed blk_ioctl(BlockBackend *blk, unsigned long int req, void *buf); int coroutine_fn blk_co_ioctl(BlockBackend *blk, unsigned long int req, void *buf); int co_wrapper_mixed blk_truncate(BlockBackend *blk, int64_t offset, bool exact, PreallocMode prealloc, BdrvRequestFlags flags, Error **errp); int coroutine_fn blk_co_truncate(BlockBackend *blk, int64_t offset, bool exact, PreallocMode prealloc, BdrvRequestFlags flags, Error **errp); #endif /* BLOCK_BACKEND_IO_H */