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hw/block: Introduce share-rw qdev property

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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>
This commit is contained in:
Kevin Wolf 2017-01-24 13:58:00 +01:00
parent a17c17a274
commit dabd18f64c
3 changed files with 61 additions and 3 deletions
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5
include/hw/block/block.h
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@ -26,6 +26,7 @@ typedef struct BlockConf {
/* geometry, not all devices use this */
uint32_t cyls, heads, secs;
OnOffAuto wce;
bool share_rw;
BlockdevOnError rerror;
BlockdevOnError werror;
} BlockConf;
@ -53,7 +54,9 @@ static inline unsigned int get_physical_block_exp(BlockConf *conf)
DEFINE_PROP_UINT32("opt_io_size", _state, _conf.opt_io_size, 0), \
DEFINE_PROP_UINT32("discard_granularity", _state, \
_conf.discard_granularity, -1), \
DEFINE_PROP_ON_OFF_AUTO("write-cache", _state, _conf.wce, ON_OFF_AUTO_AUTO)
DEFINE_PROP_ON_OFF_AUTO("write-cache", _state, _conf.wce, \
ON_OFF_AUTO_AUTO), \
DEFINE_PROP_BOOL("share-rw", _state, _conf.share_rw, false)
#define DEFINE_BLOCK_CHS_PROPERTIES(_state, _conf) \
DEFINE_PROP_UINT32("cyls", _state, _conf.cyls, 0), \