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linux-stable/Documentation/ABI/testing/sysfs-fs-virtiofs

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virtiofs: export filesystem tags through sysfs The virtiofs filesystem is mounted using a "tag" which is exported by the virtiofs device: # mount -t virtiofs <tag> /mnt The virtiofs driver knows about all the available tags but these are currently not exported to user space. People have asked for 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 at /sys/fs/virtiofs/<N>/tag where N is the id of the virtiofs device. The filesystem tag can be obtained by reading this "tag" file. There is also a symlink at /sys/fs/virtiofs/<N>/device that points to the virtiofs device that exports this tag. This patch converts the existing struct virtio_fs into a full kobject. It already had a refcount so it's an easy change. The virtio_fs objects can then be exposed in a kset at /sys/fs/virtiofs/. Note that virtio_fs objects may live slightly longer than we wish for them to be exposed to userspace, so kobject_del() is called explicitly when the underlying virtio_device is removed. The virtio_fs object is freed when all references are dropped (e.g. active mounts) but disappears as soon as the virtiofs device is gone. Originally-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2024-02-13 00:11:48 +00:00
What: /sys/fs/virtiofs/<n>/tag
Date: Feb 2024
Contact: virtio-fs@lists.linux.dev
Description:
[RO] The mount "tag" that can be used to mount this filesystem.
What: /sys/fs/virtiofs/<n>/device
Date: Feb 2024
Contact: virtio-fs@lists.linux.dev
Description:
Symlink to the virtio device that exports this filesystem.