dabd18f64c
By default, don't allow another writer for block devices that are attached to a guest device. For the cases where this setup is intended (e.g. using a cluster filesystem on the disk), the new option can be used to allow it. This change affects only devices using DEFINE_BLOCK_PROPERTIES(). Devices directly using DEFINE_PROP_DRIVE() still accept writers unconditionally. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Acked-by: Fam Zheng <famz@redhat.com>
90 lines
3.1 KiB
C
90 lines
3.1 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 "qemu-common.h"
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/* Configuration */
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typedef struct BlockConf {
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BlockBackend *blk;
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uint16_t physical_block_size;
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uint16_t logical_block_size;
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uint16_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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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(_state, _conf) \
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DEFINE_PROP_DRIVE("drive", _state, _conf.blk), \
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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_UINT16("min_io_size", _state, _conf.min_io_size, 0), \
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DEFINE_PROP_UINT32("opt_io_size", _state, _conf.opt_io_size, 0), \
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DEFINE_PROP_UINT32("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_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 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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/* Configuration helpers */
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void blkconf_serial(BlockConf *conf, char **serial);
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void 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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void blkconf_blocksizes(BlockConf *conf);
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void 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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