• Kirk Webb's avatar
    Backend support for simultaneous read-only dataset access. · 9b6e1a59
    Kirk Webb authored
    Any number of users/experiments can mount a given dataset (given that
    they have permission) in read-only mode.  Attempts to mount RW will
    fail if the dataset is currently in use.  Attempts to mount RO while
    the dataset is in use RW are also prohibited.
    
    Under the hood, iSCSI lease exports (targets) are now managed per-lease
    instead of per-experiment.  The set of authorized initiators (based
    on network) is manipulated as consumers come and go.  When the last
    consumer goes, the export is torn down. Likewise, if there are no
    current consumers, a new consumer will cause an iSCSI export to be
    created for the lease.
    
    Also included in this commit is a small tweak to implicit lease permissions.
    9b6e1a59
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