On Fri, Jan 06, 2023 at 14:33:51 +0100, Pavel Hrdina wrote: > On Thu, Jan 05, 2023 at 05:30:18PM +0100, Peter Krempa wrote: > > Prepare the internal data for passing FDs instead of having qemu open > > the file internally. > > > > Signed-off-by: Peter Krempa <pkrempa@xxxxxxxxxx> > > --- > > src/qemu/qemu_block.c | 31 ++++++++++++++++++++++++++++--- > > src/qemu/qemu_command.c | 22 ++++++++++++++++++++++ > > 2 files changed, 50 insertions(+), 3 deletions(-) > > > > diff --git a/src/qemu/qemu_block.c b/src/qemu/qemu_block.c > > index 8a6f601b29..a672ad6f54 100644 > > --- a/src/qemu/qemu_block.c > > +++ b/src/qemu/qemu_block.c > > @@ -673,22 +673,47 @@ qemuBlockStorageSourceGetSshProps(virStorageSource *src) > > > > static virJSONValue * > > qemuBlockStorageSourceGetFileProps(virStorageSource *src, > > - bool onlytarget) > > + bool onlytarget, > > + virTristateBool *autoReadOnly, > > + virTristateBool *readOnly) > > { > > + const char *path = src->path; > > const char *iomode = NULL; > > const char *prManagerAlias = NULL; > > virJSONValue *ret = NULL; > > > > if (!onlytarget) { > > + qemuDomainStorageSourcePrivate *srcpriv = QEMU_DOMAIN_STORAGE_SOURCE_PRIVATE(src); > > + > > if (src->pr) > > prManagerAlias = src->pr->mgralias; > > > > if (src->iomode != VIR_DOMAIN_DISK_IO_DEFAULT) > > iomode = virDomainDiskIoTypeToString(src->iomode); > > + > > + if (srcpriv && srcpriv->fdpass) { > > + path = qemuFDPassGetPath(srcpriv->fdpass); > > + > > + /* when passing a FD to qemu via the /dev/fdset mechanism qemu > > + * fetches the appropriate FD from the fdset by checking that it has > > + * the correct accessmode. Now with 'auto-read-only' in effect qemu > > + * wants to use a read-only FD first. If the user didn't pass multiple > > + * FDs the feature will not work regardless, so we'll disable it. */ > > What happens if users passes multiple FDs but none of them are > read-only? Otherwise looks good so if this is not an issue qemu will complain that it can't find the appropriate one. Given that this is for very specific use cases I didn't want to overdo it with validation.