qemu/hw/scsi
Kevin Wolf 86b1cf3227 block: Separate blk_is_writable() and blk_supports_write_perm()
Currently, blk_is_read_only() tells whether a given BlockBackend can
only be used in read-only mode because its root node is read-only. Some
callers actually try to answer a slightly different question: Is the
BlockBackend configured to be writable, by taking write permissions on
the root node?

This can differ, for example, for CD-ROM devices which don't take write
permissions, but may be backed by a writable image file. scsi-cd allows
write requests to the drive if blk_is_read_only() returns false.
However, the write request will immediately run into an assertion
failure because the write permission is missing.

This patch introduces separate functions for both questions.
blk_supports_write_perm() answers the question whether the block
node/image file can support writable devices, whereas blk_is_writable()
tells whether the BlockBackend is currently configured to be writable.

All calls of blk_is_read_only() are converted to one of the two new
functions.

Fixes: https://bugs.launchpad.net/bugs/1906693
Cc: qemu-stable@nongnu.org
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20210118123448.307825-2-kwolf@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2021-01-27 20:45:20 +01:00
..
Kconfig hw/nvram/Kconfig: Add an entry for the NMC93xx EEPROM 2020-01-07 12:08:39 +01:00
emulation.c scsi-generic: avoid invalid access to struct when emulating block limits 2018-11-06 21:35:06 +01:00
esp-pci.c Use DECLARE_*CHECKER* macros 2020-09-09 09:27:09 -04:00
esp.c esp: Rename ESP_STATE to ESP 2020-09-09 13:20:22 -04:00
lsi53c895a.c Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
megasas.c nomaintainer: Fix Lesser GPL version number 2020-11-15 17:04:40 +01:00
meson.build meson: convert hw/scsi 2020-08-21 06:30:28 -04:00
mfi.h Clean up header guards that don't match their file name 2016-07-12 16:19:16 +02:00
mpi.h hw: Add support for LSI SAS1068 (mptsas) device 2016-02-09 15:45:26 +01:00
mptconfig.c nomaintainer: Fix Lesser GPL version number 2020-11-15 17:04:40 +01:00
mptendian.c nomaintainer: Fix Lesser GPL version number 2020-11-15 17:04:40 +01:00
mptsas.c nomaintainer: Fix Lesser GPL version number 2020-11-15 17:04:40 +01:00
mptsas.h Use DECLARE_*CHECKER* macros 2020-09-09 09:27:09 -04:00
scsi-bus.c migration: Replace migration's JSON writer by the general one 2020-12-19 10:39:16 +01:00
scsi-disk.c block: Separate blk_is_writable() and blk_supports_write_perm() 2021-01-27 20:45:20 +01:00
scsi-generic.c block: Separate blk_is_writable() and blk_supports_write_perm() 2021-01-27 20:45:20 +01:00
spapr_vscsi.c Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
srp.h spapr-vscsi: add task management 2013-09-12 08:46:21 +02:00
trace-events virtio-scsi: trace events 2021-01-12 12:38:03 +01:00
trace.h trace: switch position of headers to what Meson requires 2020-08-21 06:18:24 -04:00
vhost-scsi-common.c vhost-scsi: support inflight io track 2020-09-30 19:09:20 +02:00
vhost-scsi.c monitor: Use getter/setter functions for cur_mon 2020-10-09 07:08:19 +02:00
vhost-user-scsi.c qdev: Move softmmu properties to qdev-properties-system.h 2020-12-18 15:20:17 -05:00
viosrp.h hw/scsi/spapr_vscsi: Do not mix SRP IU size with DMA buffer size 2020-03-17 15:08:50 +11:00
virtio-scsi-dataplane.c Replace '-enable-kvm' with '-accel kvm' in docs and help texts 2018-06-28 19:05:32 +02:00
virtio-scsi.c block: Honor blk_set_aio_context() context requirements 2021-01-20 14:48:08 -06:00
vmw_pvscsi.c Use OBJECT_DECLARE_TYPE when possible 2020-09-18 14:12:32 -04:00
vmw_pvscsi.h scsi: VMWare PVSCSI paravirtual device implementation 2013-04-19 10:44:17 +02:00