On Fri, Aug 16, 2019 at 04:37:59PM +0200, Peter Krempa wrote:
Initial implementation of 'auto-read-only' didn't reopen the backing files when needed. For '-blockdev' to work we need to be able to tel
tell
qemu to open a file read-only and change it during blockjobs as we label backing chains with a sVirt label which does not allow writing. The dynamic auto-read-only supports this as it reopens files when writing is demanded. Add a capability to detect that the posix file based backends support the dynamic part. Signed-off-by: Peter Krempa <[email protected]> Reviewed-by: Jiri Denemark <[email protected]> --- src/qemu/qemu_capabilities.c | 2 ++ src/qemu/qemu_capabilities.h | 1 + tests/qemucapabilitiesdata/caps_4.1.0.x86_64.xml | 1 + 3 files changed, 4 insertions(+) diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c index c9677315ab..83b1a12d14 100644 --- a/src/qemu/qemu_capabilities.c +++ b/src/qemu/qemu_capabilities.c @@ -537,6 +537,7 @@ VIR_ENUM_IMPL(virQEMUCaps, /* 335 */ "bochs-display", "migration-file-drop-cache", + "blockdev-file-dynamic-auto-read-only",
The string representation follows the QEMU path
);
@@ -1281,6 +1282,7 @@ static struct virQEMUCapsStringFlags
virQEMUCapsQMPSchemaQueries[] = {
{ "query-display-options/ret-type/+egl-headless/rendernode",
QEMU_CAPS_EGL_HEADLESS_RENDERNODE },
{ "nbd-server-add/arg-type/bitmap", QEMU_CAPS_NBD_BITMAP },
{ "blockdev-add/arg-type/+file/drop-cache",
QEMU_CAPS_MIGRATION_FILE_DROP_CACHE },
+ { "blockdev-add/arg-type/+file/$dynamic-auto-read-only",
QEMU_CAPS_BLOCK_FILE_AUTO_READONLY_DYNAMIC },
};
typedef struct _virQEMUCapsObjectTypeProps virQEMUCapsObjectTypeProps;
diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
index 68ef6c49b4..2fe0e26ced 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -518,6 +518,7 @@ typedef enum { /* virQEMUCapsFlags grouping marker for
syntax-check */
/* 335 */
QEMU_CAPS_DEVICE_BOCHS_DISPLAY, /* -device bochs-display */
QEMU_CAPS_MIGRATION_FILE_DROP_CACHE, /* migration with disk cache on is
safe for type='file' disks */
+ QEMU_CAPS_BLOCK_FILE_AUTO_READONLY_DYNAMIC, /* the auto-read-only property
of block backends for files is dynamic */
But the constant has the words in a random order. Would QEMU_CAPS_BLOCKDEV_DYNAMIC_AUTO_READONLY be enough? It's internal so we can rename it later if needed. Also, the capability rewrapping script should be capable of handling two-line comments. (Three lines would require changing it)
QEMU_CAPS_LAST /* this must always be the last item */
} virQEMUCapsFlags;
Reviewed-by: Ján Tomko <[email protected]> Jano
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