/*
* QEMU Block backends
*
- * Copyright (C) 2014 Red Hat, Inc.
+ * Copyright (C) 2014-2016 Red Hat, Inc.
*
* Authors:
#ifndef BLOCK_BACKEND_H
#define BLOCK_BACKEND_H
-#include "qemu/typedefs.h"
-#include "qapi/error.h"
+#include "qemu/iov.h"
+#include "block/throttle-groups.h"
/*
* TODO Have to include block/block.h for a bunch of block layer
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);
+/* This struct is embedded in (the private) BlockBackend struct and contains
+ * fields that must be public. This is in particular for QLIST_ENTRY() and
+ * friends so that BlockBackends can be kept in lists outside block-backend.c */
+typedef struct BlockBackendPublic {
+ /* I/O throttling has its own locking, but also some fields are
+ * protected by the AioContext lock.
+ */
+
+ /* Protected by AioContext lock. */
+ CoQueue throttled_reqs[2];
+
+ /* Nonzero if the I/O limits are currently being ignored; generally
+ * it is zero. */
+ unsigned int io_limits_disabled;
+
+ /* The following fields are protected by the ThrottleGroup lock.
+ * See the ThrottleGroup documentation for details.
+ * throttle_state tells us if I/O limits are configured. */
+ ThrottleState *throttle_state;
+ ThrottleTimers throttle_timers;
+ unsigned pending_reqs[2];
+ QLIST_ENTRY(BlockBackendPublic) round_robin;
+} BlockBackendPublic;
+
+BlockBackend *blk_new(void);
+BlockBackend *blk_new_open(const char *filename, const char *reference,
+ QDict *options, int flags, Error **errp);
int blk_get_refcnt(BlockBackend *blk);
void blk_ref(BlockBackend *blk);
void blk_unref(BlockBackend *blk);
+void blk_remove_all_bs(void);
const char *blk_name(BlockBackend *blk);
BlockBackend *blk_by_name(const char *name);
BlockBackend *blk_next(BlockBackend *blk);
+bool monitor_add_blk(BlockBackend *blk, const char *name, Error **errp);
+void monitor_remove_blk(BlockBackend *blk);
+
+BlockBackendPublic *blk_get_public(BlockBackend *blk);
+BlockBackend *blk_by_public(BlockBackendPublic *public);
BlockDriverState *blk_bs(BlockBackend *blk);
void blk_remove_bs(BlockBackend *blk);
void blk_insert_bs(BlockBackend *blk, BlockDriverState *bs);
+bool bdrv_has_blk(BlockDriverState *bs);
+bool bdrv_is_root_node(BlockDriverState *bs);
-void blk_hide_on_behalf_of_hmp_drive_del(BlockBackend *blk);
-
+void blk_set_allow_write_beyond_eof(BlockBackend *blk, bool allow);
void blk_iostatus_enable(BlockBackend *blk);
bool blk_iostatus_is_enabled(const BlockBackend *blk);
BlockDeviceIoStatus blk_iostatus(const BlockBackend *blk);
void blk_iostatus_disable(BlockBackend *blk);
void blk_iostatus_reset(BlockBackend *blk);
void blk_iostatus_set_err(BlockBackend *blk, int error);
-int blk_attach_dev(BlockBackend *blk, void *dev);
-void blk_attach_dev_nofail(BlockBackend *blk, void *dev);
+int blk_attach_dev(BlockBackend *blk, DeviceState *dev);
+void blk_attach_dev_legacy(BlockBackend *blk, void *dev);
void blk_detach_dev(BlockBackend *blk, void *dev);
void *blk_get_attached_dev(BlockBackend *blk);
+BlockBackend *blk_by_dev(void *dev);
+BlockBackend *blk_by_qdev_id(const char *id, Error **errp);
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_unthrottled(BlockBackend *blk, int64_t offset, uint8_t *buf,
+ int count);
+int coroutine_fn blk_co_preadv(BlockBackend *blk, int64_t offset,
+ unsigned int bytes, QEMUIOVector *qiov,
+ BdrvRequestFlags flags);
+int coroutine_fn blk_co_pwritev(BlockBackend *blk, int64_t offset,
+ unsigned int bytes, QEMUIOVector *qiov,
+ BdrvRequestFlags flags);
+int blk_pwrite_zeroes(BlockBackend *blk, int64_t offset,
+ int count, BdrvRequestFlags flags);
+BlockAIOCB *blk_aio_pwrite_zeroes(BlockBackend *blk, int64_t offset,
+ int count, BdrvRequestFlags flags,
+ BlockCompletionFunc *cb, void *opaque);
+int blk_make_zero(BlockBackend *blk, BdrvRequestFlags flags);
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);
+int blk_pwrite(BlockBackend *blk, int64_t offset, const void *buf, int count,
+ BdrvRequestFlags flags);
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,
+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_discard(BlockBackend *blk,
- int64_t sector_num, int nb_sectors,
- BlockCompletionFunc *cb, void *opaque);
+BlockAIOCB *blk_aio_pdiscard(BlockBackend *blk, int64_t offset, int count,
+ 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_co_ioctl(BlockBackend *blk, unsigned long int req, void *buf);
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_pdiscard(BlockBackend *blk, int64_t offset, int count);
int blk_co_flush(BlockBackend *blk);
int blk_flush(BlockBackend *blk);
-int blk_flush_all(void);
+int blk_commit_all(void);
void blk_drain(BlockBackend *blk);
void blk_drain_all(void);
void blk_set_on_error(BlockBackend *blk, BlockdevOnError on_read_error,
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);
+uint32_t blk_get_max_transfer(BlockBackend *blk);
+int blk_get_max_iov(BlockBackend *blk);
void blk_set_guest_block_size(BlockBackend *blk, int align);
+void *blk_try_blockalign(BlockBackend *blk, size_t size);
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 *),
void (*detach_aio_context)(void *),
void *opaque);
-void blk_add_close_notifier(BlockBackend *blk, Notifier *notify);
+void blk_add_remove_bs_notifier(BlockBackend *blk, Notifier *notify);
+void blk_add_insert_bs_notifier(BlockBackend *blk, Notifier *notify);
void blk_io_plug(BlockBackend *blk);
void blk_io_unplug(BlockBackend *blk);
BlockAcctStats *blk_get_stats(BlockBackend *blk);
BlockBackendRootState *blk_get_root_state(BlockBackend *blk);
void blk_update_root_state(BlockBackend *blk);
-void blk_apply_root_state(BlockBackend *blk, BlockDriverState *bs);
+bool blk_get_detect_zeroes_from_root_state(BlockBackend *blk);
int blk_get_open_flags_from_root_state(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 coroutine_fn blk_co_pwrite_zeroes(BlockBackend *blk, int64_t offset,
+ int count, BdrvRequestFlags flags);
+int blk_pwrite_compressed(BlockBackend *blk, int64_t offset, const void *buf,
+ int count);
int blk_truncate(BlockBackend *blk, int64_t offset);
-int blk_discard(BlockBackend *blk, int64_t sector_num, int nb_sectors);
+int blk_pdiscard(BlockBackend *blk, int64_t offset, int count);
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);
BlockCompletionFunc *cb,
void *opaque, int ret);
+void blk_set_io_limits(BlockBackend *blk, ThrottleConfig *cfg);
+void blk_io_limits_disable(BlockBackend *blk);
+void blk_io_limits_enable(BlockBackend *blk, const char *group);
+void blk_io_limits_update_group(BlockBackend *blk, const char *group);
+
#endif
projects / qemu.git / blobdiff