backend_defaults property allow users to control if default block properties should be decided with backend information. If it is off, any backend information will be discarded, which is suitable if you plan to perform live migration to a different disk backend. If it is on, a block device may utilize backend information more aggressively. By default, it is auto, which uses backend information for block sizes and ignores the others, which is consistent with the older versions. Signed-off-by: Akihiko Odaki <akihiko.odaki@gmail.com> Message-id: 20210705130458.97642-2-akihiko.odaki@gmail.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
106 lines
3.9 KiB
C
106 lines
3.9 KiB
C
/*
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* Common code for block device models
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*
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* Copyright (C) 2012 Red Hat, Inc.
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* Copyright (c) 2003-2008 Fabrice Bellard
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or
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* later. See the COPYING file in the top-level directory.
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*/
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#ifndef HW_BLOCK_H
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#define HW_BLOCK_H
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#include "exec/hwaddr.h"
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#include "qapi/qapi-types-block-core.h"
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#include "hw/qdev-properties-system.h"
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/* Configuration */
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typedef struct BlockConf {
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BlockBackend *blk;
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OnOffAuto backend_defaults;
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uint32_t physical_block_size;
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uint32_t logical_block_size;
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uint32_t min_io_size;
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uint32_t opt_io_size;
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int32_t bootindex;
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uint32_t discard_granularity;
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/* geometry, not all devices use this */
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uint32_t cyls, heads, secs;
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uint32_t lcyls, lheads, lsecs;
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OnOffAuto wce;
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bool share_rw;
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BlockdevOnError rerror;
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BlockdevOnError werror;
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} BlockConf;
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static inline unsigned int get_physical_block_exp(BlockConf *conf)
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{
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unsigned int exp = 0, size;
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for (size = conf->physical_block_size;
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size > conf->logical_block_size;
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size >>= 1) {
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exp++;
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}
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return exp;
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}
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#define DEFINE_BLOCK_PROPERTIES_BASE(_state, _conf) \
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DEFINE_PROP_ON_OFF_AUTO("backend_defaults", _state, \
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_conf.backend_defaults, ON_OFF_AUTO_AUTO), \
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DEFINE_PROP_BLOCKSIZE("logical_block_size", _state, \
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_conf.logical_block_size), \
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DEFINE_PROP_BLOCKSIZE("physical_block_size", _state, \
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_conf.physical_block_size), \
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DEFINE_PROP_SIZE32("min_io_size", _state, _conf.min_io_size, 0), \
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DEFINE_PROP_SIZE32("opt_io_size", _state, _conf.opt_io_size, 0), \
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DEFINE_PROP_SIZE32("discard_granularity", _state, \
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_conf.discard_granularity, -1), \
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DEFINE_PROP_ON_OFF_AUTO("write-cache", _state, _conf.wce, \
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ON_OFF_AUTO_AUTO), \
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DEFINE_PROP_BOOL("share-rw", _state, _conf.share_rw, false)
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#define DEFINE_BLOCK_PROPERTIES(_state, _conf) \
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DEFINE_PROP_DRIVE("drive", _state, _conf.blk), \
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DEFINE_BLOCK_PROPERTIES_BASE(_state, _conf)
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#define DEFINE_BLOCK_CHS_PROPERTIES(_state, _conf) \
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DEFINE_PROP_UINT32("cyls", _state, _conf.cyls, 0), \
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DEFINE_PROP_UINT32("heads", _state, _conf.heads, 0), \
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DEFINE_PROP_UINT32("secs", _state, _conf.secs, 0), \
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DEFINE_PROP_UINT32("lcyls", _state, _conf.lcyls, 0), \
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DEFINE_PROP_UINT32("lheads", _state, _conf.lheads, 0), \
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DEFINE_PROP_UINT32("lsecs", _state, _conf.lsecs, 0)
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#define DEFINE_BLOCK_ERROR_PROPERTIES(_state, _conf) \
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DEFINE_PROP_BLOCKDEV_ON_ERROR("rerror", _state, _conf.rerror, \
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BLOCKDEV_ON_ERROR_AUTO), \
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DEFINE_PROP_BLOCKDEV_ON_ERROR("werror", _state, _conf.werror, \
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BLOCKDEV_ON_ERROR_AUTO)
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/* Backend access helpers */
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bool blk_check_size_and_read_all(BlockBackend *blk, void *buf, hwaddr size,
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Error **errp);
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/* Configuration helpers */
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bool blkconf_geometry(BlockConf *conf, int *trans,
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unsigned cyls_max, unsigned heads_max, unsigned secs_max,
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Error **errp);
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bool blkconf_blocksizes(BlockConf *conf, Error **errp);
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bool blkconf_apply_backend_options(BlockConf *conf, bool readonly,
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bool resizable, Error **errp);
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/* Hard disk geometry */
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void hd_geometry_guess(BlockBackend *blk,
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uint32_t *pcyls, uint32_t *pheads, uint32_t *psecs,
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int *ptrans);
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int hd_bios_chs_auto_trans(uint32_t cyls, uint32_t heads, uint32_t secs);
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#endif
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