Cyril ROUHASSIA wrote: > > Dear all, > I have some problems with zfs implementation issues: > > * I do not really understand what is a DSL directory (I though is > was kind of structure listing all datasets + properties..) and > what is the unique "Active Dataset" within a DSL directory?
Yes, the DSL directory (dsl_dir_[phys_]t structures) keeps track of the naming hierarchy of datasets (eg, the fact that under "pool" there are filesytems "fs1" and "fs2" -- in dd_child_dir_zapobj). It also keeps track of properties that use the generic dsl_prop_* infrastructure (in dd_props_zapobj), quota and reservation, and space usage information (aggregating space used by children as well). You can find more details in the structure definitions in dsl_dir.h. The "active dataset" means the non-snapshot dataset, which can be modified. It is dd_head_dataset_obj. The active dataset (synonymous with head dataset) has the list of snapshots (ds_snapnames_zapobj). Note that a clone is not really different than any other filesystem from the dsl_dataset point of view (actually, it is barely different from any implementation point of view). Eg, a clone has a head/active dataset and may have snapshots, children datasets, etc. Hope that helps. --matt > ************************************************************************* > This message and any attachments (the "message") are confidential, intended > solely for the addressee(s), and may contain legally privileged information. Then maybe you shouldn't be posting it on a public mailing list :-\
