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| author | Kevin Wolf <kwolf@redhat.com> | 2017-01-24 13:58:00 +0100 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2017-02-28 20:40:36 +0100 |
| commit | dabd18f64c8800d441fd9fb232c2102e8409aa2e (patch) | |
| tree | 96cd8be59b9a5f045edca263974b08d26f169884 /hw/block | |
| parent | a17c17a274f24f0c0259f89d288f29b8ce0511aa (diff) | |
| download | qemu-dabd18f64c8800d441fd9fb232c2102e8409aa2e.zip qemu-dabd18f64c8800d441fd9fb232c2102e8409aa2e.tar.gz qemu-dabd18f64c8800d441fd9fb232c2102e8409aa2e.tar.bz2 | |
hw/block: Introduce share-rw qdev property
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>
Diffstat (limited to 'hw/block')
| -rw-r--r-- | hw/block/block.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/hw/block/block.c b/hw/block/block.c index 7059ba1..27878d0 100644 --- a/hw/block/block.c +++ b/hw/block/block.c @@ -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) { |