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>

1 files changed, 53 insertions, 0 deletions

diff --git a/tests/qemu-iotests/172.out b/tests/qemu-iotests/172.out
index 6b7edaf..54b5329 100644
--- a/tests/qemu-iotests/172.out
+++ b/tests/qemu-iotests/172.out
@@ -28,6 +28,7 @@ Testing:
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "288"
 
 
@@ -57,6 +58,7 @@ Testing: -fda TEST_DIR/t.qcow2
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
 
 Testing: -fdb TEST_DIR/t.qcow2
@@ -83,6 +85,7 @@ Testing: -fdb TEST_DIR/t.qcow2
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
               dev: floppy, id ""
                 unit = 0 (0x0)
@@ -93,6 +96,7 @@ Testing: -fdb TEST_DIR/t.qcow2
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "288"
 
 Testing: -fda TEST_DIR/t.qcow2 -fdb TEST_DIR/t.qcow2
@@ -119,6 +123,7 @@ Testing: -fda TEST_DIR/t.qcow2 -fdb TEST_DIR/t.qcow2
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
               dev: floppy, id ""
                 unit = 0 (0x0)
@@ -129,6 +134,7 @@ Testing: -fda TEST_DIR/t.qcow2 -fdb TEST_DIR/t.qcow2
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
 
 
@@ -158,6 +164,7 @@ Testing: -drive if=floppy,file=TEST_DIR/t.qcow2
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
 
 Testing: -drive if=floppy,file=TEST_DIR/t.qcow2,index=1
@@ -184,6 +191,7 @@ Testing: -drive if=floppy,file=TEST_DIR/t.qcow2,index=1
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
               dev: floppy, id ""
                 unit = 0 (0x0)
@@ -194,6 +202,7 @@ Testing: -drive if=floppy,file=TEST_DIR/t.qcow2,index=1
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "288"
 
 Testing: -drive if=floppy,file=TEST_DIR/t.qcow2 -drive if=floppy,file=TEST_DIR/t.qcow2,index=1
@@ -220,6 +229,7 @@ Testing: -drive if=floppy,file=TEST_DIR/t.qcow2 -drive if=floppy,file=TEST_DIR/t
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
               dev: floppy, id ""
                 unit = 0 (0x0)
@@ -230,6 +240,7 @@ Testing: -drive if=floppy,file=TEST_DIR/t.qcow2 -drive if=floppy,file=TEST_DIR/t
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
 
 
@@ -259,6 +270,7 @@ Testing: -drive if=none,file=TEST_DIR/t.qcow2 -global isa-fdc.driveA=none0
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
 
 Testing: -drive if=none,file=TEST_DIR/t.qcow2 -global isa-fdc.driveB=none0
@@ -285,6 +297,7 @@ Testing: -drive if=none,file=TEST_DIR/t.qcow2 -global isa-fdc.driveB=none0
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
 
 Testing: -drive if=none,file=TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2 -global isa-fdc.driveA=none0 -global isa-fdc.driveB=none1
@@ -311,6 +324,7 @@ Testing: -drive if=none,file=TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qco
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
               dev: floppy, id ""
                 unit = 0 (0x0)
@@ -321,6 +335,7 @@ Testing: -drive if=none,file=TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qco
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
 
 
@@ -350,6 +365,7 @@ Testing: -drive if=none,file=TEST_DIR/t.qcow2 -device floppy,drive=none0
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
 
 Testing: -drive if=none,file=TEST_DIR/t.qcow2 -device floppy,drive=none0,unit=1
@@ -376,6 +392,7 @@ Testing: -drive if=none,file=TEST_DIR/t.qcow2 -device floppy,drive=none0,unit=1
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
 
 Testing: -drive if=none,file=TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2 -device floppy,drive=none0 -device floppy,drive=none1,unit=1
@@ -402,6 +419,7 @@ Testing: -drive if=none,file=TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qco
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
               dev: floppy, id ""
                 unit = 0 (0x0)
@@ -412,6 +430,7 @@ Testing: -drive if=none,file=TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qco
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
 
 
@@ -441,6 +460,7 @@ Testing: -fda TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2 -global isa-
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
               dev: floppy, id ""
                 unit = 0 (0x0)
@@ -451,6 +471,7 @@ Testing: -fda TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2 -global isa-
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
 
 Testing: -fdb TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2 -global isa-fdc.driveA=none0
@@ -477,6 +498,7 @@ Testing: -fdb TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2 -global isa-
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
               dev: floppy, id ""
                 unit = 0 (0x0)
@@ -487,6 +509,7 @@ Testing: -fdb TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2 -global isa-
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
 
 Testing: -fda TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2 -global isa-fdc.driveA=none0
@@ -513,6 +536,7 @@ Testing: -fda TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2 -global isa-
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
 
 Testing: -fdb TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2 -global isa-fdc.driveB=none0
@@ -539,6 +563,7 @@ Testing: -fdb TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2 -global isa-
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
 
 
@@ -568,6 +593,7 @@ Testing: -fda TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2 -device flop
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
               dev: floppy, id ""
                 unit = 0 (0x0)
@@ -578,6 +604,7 @@ Testing: -fda TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2 -device flop
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
 
 Testing: -fda TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2 -device floppy,drive=none0,unit=1
@@ -604,6 +631,7 @@ Testing: -fda TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2 -device flop
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
               dev: floppy, id ""
                 unit = 0 (0x0)
@@ -614,6 +642,7 @@ Testing: -fda TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2 -device flop
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
 
 Testing: -fdb TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2 -device floppy,drive=none0
@@ -640,6 +669,7 @@ Testing: -fdb TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2 -device flop
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
               dev: floppy, id ""
                 unit = 1 (0x1)
@@ -650,6 +680,7 @@ Testing: -fdb TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2 -device flop
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
 
 Testing: -fdb TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2 -device floppy,drive=none0,unit=0
@@ -676,6 +707,7 @@ Testing: -fdb TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2 -device flop
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
               dev: floppy, id ""
                 unit = 1 (0x1)
@@ -686,6 +718,7 @@ Testing: -fdb TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2 -device flop
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
 
 Testing: -fda TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2 -device floppy,drive=none0,unit=0
@@ -723,6 +756,7 @@ Testing: -drive if=floppy,file=TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.q
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
               dev: floppy, id ""
                 unit = 0 (0x0)
@@ -733,6 +767,7 @@ Testing: -drive if=floppy,file=TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.q
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
 
 Testing: -drive if=floppy,file=TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2 -device floppy,drive=none0,unit=1
@@ -759,6 +794,7 @@ Testing: -drive if=floppy,file=TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.q
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
               dev: floppy, id ""
                 unit = 0 (0x0)
@@ -769,6 +805,7 @@ Testing: -drive if=floppy,file=TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.q
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
 
 Testing: -drive if=floppy,file=TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2 -device floppy,drive=none0,unit=0
@@ -802,6 +839,7 @@ Testing: -drive if=none,file=TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qco
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
               dev: floppy, id ""
                 unit = 0 (0x0)
@@ -812,6 +850,7 @@ Testing: -drive if=none,file=TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qco
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
 
 Testing: -drive if=none,file=TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2 -global isa-fdc.driveA=none0 -device floppy,drive=none1,unit=1
@@ -838,6 +877,7 @@ Testing: -drive if=none,file=TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qco
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
               dev: floppy, id ""
                 unit = 0 (0x0)
@@ -848,6 +888,7 @@ Testing: -drive if=none,file=TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qco
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
 
 Testing: -drive if=none,file=TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2 -global isa-fdc.driveB=none0 -device floppy,drive=none1
@@ -874,6 +915,7 @@ Testing: -drive if=none,file=TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qco
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
               dev: floppy, id ""
                 unit = 1 (0x1)
@@ -884,6 +926,7 @@ Testing: -drive if=none,file=TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qco
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
 
 Testing: -drive if=none,file=TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2 -global isa-fdc.driveB=none0 -device floppy,drive=none1,unit=0
@@ -910,6 +953,7 @@ Testing: -drive if=none,file=TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qco
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
               dev: floppy, id ""
                 unit = 1 (0x1)
@@ -920,6 +964,7 @@ Testing: -drive if=none,file=TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qco
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
 
 Testing: -drive if=none,file=TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2 -global isa-fdc.driveA=none0 -device floppy,drive=none1,unit=0
@@ -964,6 +1009,7 @@ Testing: -device floppy
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "288"
 
 Testing: -device floppy,drive-type=120
@@ -990,6 +1036,7 @@ Testing: -device floppy,drive-type=120
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "120"
 
 Testing: -device floppy,drive-type=144
@@ -1016,6 +1063,7 @@ Testing: -device floppy,drive-type=144
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
 
 Testing: -device floppy,drive-type=288
@@ -1042,6 +1090,7 @@ Testing: -device floppy,drive-type=288
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "288"
 
 
@@ -1071,6 +1120,7 @@ Testing: -drive if=none,file=TEST_DIR/t.qcow2 -device floppy,drive=none0,drive-t
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "120"
 
 Testing: -drive if=none,file=TEST_DIR/t.qcow2 -device floppy,drive=none0,drive-type=288
@@ -1097,6 +1147,7 @@ Testing: -drive if=none,file=TEST_DIR/t.qcow2 -device floppy,drive=none0,drive-t
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "288"
 
 
@@ -1126,6 +1177,7 @@ Testing: -drive if=none,file=TEST_DIR/t.qcow2 -device floppy,drive=none0,logical
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
 
 Testing: -drive if=none,file=TEST_DIR/t.qcow2 -device floppy,drive=none0,physical_block_size=512
@@ -1152,6 +1204,7 @@ Testing: -drive if=none,file=TEST_DIR/t.qcow2 -device floppy,drive=none0,physica
                 opt_io_size = 0 (0x0)
                 discard_granularity = 4294967295 (0xffffffff)
                 write-cache = "auto"
+                share-rw = false
                 drive-type = "144"
 
 Testing: -drive if=none,file=TEST_DIR/t.qcow2 -device floppy,drive=none0,logical_block_size=4096