While the basic idea is obvious and could be handled by the default bdrv_dirname() implementation, we cannot generate a directory name if the gid or uid are set, so we have to explicitly return NULL in those cases.
Signed-off-by: Max Reitz <mre...@redhat.com> --- block/nfs.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/block/nfs.c b/block/nfs.c index d082783..81ce98a 100644 --- a/block/nfs.c +++ b/block/nfs.c @@ -828,6 +828,19 @@ static void nfs_refresh_filename(BlockDriverState *bs, QDict *options) bs->full_open_options = opts; } +static char *nfs_dirname(BlockDriverState *bs, Error **errp) +{ + NFSClient *client = bs->opaque; + + if (client->uid || client->gid) { + error_setg(errp, "Cannot generate a base directory for NBD node '%s'", + bs->filename); + return NULL; + } + + return g_strdup_printf("nfs://%s%s/", client->server->host, client->path); +} + #ifdef LIBNFS_FEATURE_PAGECACHE static void nfs_invalidate_cache(BlockDriverState *bs, Error **errp) @@ -861,6 +874,7 @@ static BlockDriver bdrv_nfs = { .bdrv_detach_aio_context = nfs_detach_aio_context, .bdrv_attach_aio_context = nfs_attach_aio_context, .bdrv_refresh_filename = nfs_refresh_filename, + .bdrv_dirname = nfs_dirname, #ifdef LIBNFS_FEATURE_PAGECACHE .bdrv_invalidate_cache = nfs_invalidate_cache, -- 2.10.2