doc: add section to manpage for recover_session= option
Now that the recover_session= mount option has been added to the testing branch in the kernel, we need to update the mount.ceph manpage to document it. Zheng added this to the kernel ceph.txt file:
+ recover_session=<no|clean> + Set auto reconnect mode in the case where the client is blacklisted. The + available modes are "no" and "clean". The default is "no". + + * no: never attempt to reconnect when client detects that it has been + blacklisted. Operations will generally fail after being blacklisted. + + * clean: client reconnects to the ceph cluster automatically when it + detects that it has been blacklisted. During reconnect, client drops + dirty data/metadata, invalidates page caches and writable file handles. + After reconnect, file locks become stale because the MDS loses track + of them. If an inode contains any stale file locks, read/write on the + inode is not allowed until applications release all stale file locks.
We'll want a similar section for mount.ceph(8) (which is generated from doc/man/8/mount.ceph.rst).