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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> |
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| .. | ||
| bus.c | ||
| ccid-card-emulated.c | ||
| ccid-card-passthru.c | ||
| ccid.h | ||
| chipidea.c | ||
| combined-packet.c | ||
| core.c | ||
| desc-msos.c | ||
| desc.c | ||
| desc.h | ||
| dev-audio.c | ||
| dev-hid.c | ||
| dev-hub.c | ||
| dev-mtp.c | ||
| dev-network.c | ||
| dev-serial.c | ||
| dev-smartcard-reader.c | ||
| dev-storage.c | ||
| dev-uas.c | ||
| dev-wacom.c | ||
| hcd-dwc2.c | ||
| hcd-dwc2.h | ||
| hcd-dwc3.c | ||
| hcd-ehci-pci.c | ||
| hcd-ehci-sysbus.c | ||
| hcd-ehci.c | ||
| hcd-ehci.h | ||
| hcd-musb.c | ||
| hcd-ohci-pci.c | ||
| hcd-ohci.c | ||
| hcd-ohci.h | ||
| hcd-uhci.c | ||
| hcd-xhci-nec.c | ||
| hcd-xhci-pci.c | ||
| hcd-xhci-pci.h | ||
| hcd-xhci-sysbus.c | ||
| hcd-xhci-sysbus.h | ||
| hcd-xhci.c | ||
| hcd-xhci.h | ||
| host-libusb.c | ||
| host-stub.c | ||
| host.h | ||
| imx-usb-phy.c | ||
| Kconfig | ||
| libhw.c | ||
| meson.build | ||
| pcap.c | ||
| quirks-ftdi-ids.h | ||
| quirks-pl2303-ids.h | ||
| quirks.c | ||
| quirks.h | ||
| redirect.c | ||
| trace-events | ||
| trace.h | ||
| tusb6010.c | ||
| u2f-emulated.c | ||
| u2f-passthru.c | ||
| u2f.c | ||
| u2f.h | ||
| xen-usb.c | ||
| xlnx-usb-subsystem.c | ||
| xlnx-versal-usb2-ctrl-regs.c | ||