On Thu, Oct 05, 2023 at 04:30:30PM -0400, Vivek Goyal wrote: > virtiofs filesystem is mounted using a "tag" which is exported by the > virtiofs device. virtiofs driver knows about all the available tags but > these are not exported to user space. > > People have asked these tags to be exported to user space. Most recently > Lennart Poettering has asked for it as he wants to scan the tags and mount > virtiofs automatically in certain cases. > > https://gitlab.com/virtio-fs/virtiofsd/-/issues/128 > > This patch exports tags through sysfs. One tag is associated with each > virtiofs device. A new "tag" file appears under virtiofs device dir. > Actual filesystem tag can be obtained by reading this "tag" file. > > For example, if a virtiofs device exports tag "myfs", a new file "tag" > will show up here. > > /sys/bus/virtio/devices/virtio<N>/tag > > # cat /sys/bus/virtio/devices/virtio<N>/tag > myfs If you respin this series, please mention that the tag is available at KOBJ_BIND time, but not KOBJ_ADD. Just a sentence or two is enough to help someone trying to figure out how to use this new sysfs attr with udev. > > Signed-off-by: Vivek Goyal <vgoyal@xxxxxxxxxx> > --- > fs/fuse/virtio_fs.c | 34 ++++++++++++++++++++++++++++++++++ > 1 file changed, 34 insertions(+) Reviewed-by: Stefan Hajnoczi <stefanha@xxxxxxxxxx>
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