A cephfs-specific quota implementation has been available in the user-space fuse client for a while. This quota implementation allows an administrator to restrict the number of bytes and/or the number of files in a filesystem subtree. This quota implementation, however, is supported at the client-level only, which means that cooperation is required between different clients accessing the system. This obviously assumes that all clients are trusted entities and will respect the quotas, preventing users from exceeding the quota limits. Since the kernel client doesn't support quotas, it has not been possible to use it in a cluster where quotas are a requirement. This patchset is an RFC that adds kernel client support for cephfs quotas as it is currently implemented in the ceph fuse client. Note however that this patchset is not yet feature complete, as it only implements the max_files quota (max_bytes is still missing). I just wanted to have some early review before continuing, specially in the reverse path walk code, as this seems to be the perfect place to fail ;-) I've obviously done some basic testing on this patchset but nothing really complex -- single client on small (VMs) cluster. Jan (thanks a lot!) has pushed a branch that should enable testing using teuthology, but unfortunately we haven't tried it: https://github.com/jan--f/ceph/tree/wip-quota-kernel-testing [ Note that the goal is to simply use the existing workunit quota.sh once the kernel client has support for both max_files and max_bytes. ] Luis Henriques (3): ceph: quota: add initial infrastructure to support cephfs quotas ceph: quotas: support for ceph.quota.max_files ceph: quota: don't allow cross-quota renames fs/ceph/Makefile | 2 +- fs/ceph/dir.c | 15 ++++ fs/ceph/file.c | 4 +- fs/ceph/inode.c | 6 ++ fs/ceph/mds_client.c | 21 ++++++ fs/ceph/mds_client.h | 2 + fs/ceph/quota.c | 136 +++++++++++++++++++++++++++++++++++++ fs/ceph/super.h | 10 +++ fs/ceph/xattr.c | 45 ++++++++++++ include/linux/ceph/ceph_features.h | 3 +- include/linux/ceph/ceph_fs.h | 17 +++++ 11 files changed, 258 insertions(+), 3 deletions(-) create mode 100644 fs/ceph/quota.c -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
