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-Quotas
-======
-
-CephFS allows quotas to be set on any directory in the system.  The
-quota can restrict the number of *bytes* or the number of *files*
-stored beneath that point in the directory hierarchy.
-
-Limitations
------------
-
-#. *Quotas are cooperative and non-adversarial.* CephFS quotas rely on
-   the cooperation of the client who is mounting the file system to
-   stop writers when a limit is reached.  A modified or adversarial
-   client cannot be prevented from writing as much data as it needs.
-   Quotas should not be relied on to prevent filling the system in
-   environments where the clients are fully untrusted.
-
-#. *Quotas are imprecise.* Processes that are writing to the file
-   system will be stopped a short time after the quota limit is
-   reached.  They will inevitably be allowed to write some amount of
-   data over the configured limit.  How far over the quota they are
-   able to go depends primarily on the amount of time, not the amount
-   of data.  Generally speaking writers will be stopped within 10s of
-   seconds of crossing the configured limit.
-
-#. *Quotas are not yet implemented in the kernel client.* Quotas are
-   supported by the userspace client (libcephfs, ceph-fuse) but are
-   not yet implemented in the Linux kernel client.
-
-#. *Quotas must be configured carefully when used with path-based
-   mount restrictions.* The client needs to have access to the
-   directory inode on which quotas are configured in order to enforce
-   them.  If the client has restricted access to a specific path
-   (e.g., ``/home/user``) based on the MDS capability, and a quota is
-   configured on an ancestor directory they do not have access to
-   (e.g., ``/home``), the client will not enforce it.  When using
-   path-based access restrictions be sure to configure the quota on
-   the directory the client is restricted too (e.g., ``/home/user``)
-   or something nested beneath it.
-
-Configuration
--------------
-
-Like most other things in CephFS, quotas are configured using virtual
-extended attributes:
-
- * ``ceph.quota.max_files`` -- file limit
- * ``ceph.quota.max_bytes`` -- byte limit
-
-If the attributes appear on a directory inode that means a quota is
-configured there.  If they are not present then no quota is set on
-that directory (although one may still be configured on a parent directory).
-
-To set a quota::
-
-  setfattr -n ceph.quota.max_bytes -v 100000000 /some/dir     # 100 MB
-  setfattr -n ceph.quota.max_files -v 10000 /some/dir         # 10,000 files
-
-To view quota settings::
-
-  getfattr -n ceph.quota.max_bytes /some/dir
-  getfattr -n ceph.quota.max_files /some/dir
-
-Note that if the value of the extended attribute is ``0`` that means
-the quota is not set.
-
-To remove a quota::
-
-  setfattr -n ceph.quota.max_bytes -v 0 /some/dir
-  setfattr -n ceph.quota.max_files -v 0 /some/dir