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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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6
hw/block/block.c
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@ -65,12 +65,14 @@ void blkconf_apply_backend_options(BlockConf *conf, bool readonly,
perm |= BLK_PERM_WRITE;
}
/* TODO Remove BLK_PERM_WRITE unless explicitly configured so */
shared_perm = BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE_UNCHANGED |
BLK_PERM_GRAPH_MOD | BLK_PERM_WRITE;
BLK_PERM_GRAPH_MOD;
if (resizable) {
shared_perm |= BLK_PERM_RESIZE;
}
if (conf->share_rw) {
shared_perm |= BLK_PERM_WRITE;
}
ret = blk_set_perm(blk, perm, shared_perm, errp);
if (ret < 0) {