Apache core allows configuration of the etag with the FileETag directive. This is particularly important to us due to having multiple backends, where the inode will be different depending on which backend is used. As a result we do not want the inode to be part of our etag. Unfortunately, mod_dav_fs does not respect the FileETag directive, and always includes the inode as part of the etag. This causes a problem for davfs2, which uses etags to determine if a cached file is still valid. davfs retrieves files with a GET, which uses the etag defined by the core, but when doing a directory listing, uses PROPFIND, which uses the mod_dav_fs etag, which is then different. This invalidates the cache of every file on every directory listing. mod_dav_fs should respect the FileETag directive so that these etags match.
The use case for this bug is multiple servers using DAV with read-only files behind a load balancer.
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