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cdbe475fe3
Define a new pvs field, pv_mda_used_count, and a new vgs field, vg_mda_used_count to match the existing pv_mda_count and vg_mda_count. These new fields count the number of mdas that have the 'ignored' bit clear (they are in use on the PV / VG). Also define various supporting functions to implement the counting as well as setting the ignored flag and determining if an mda is ignored. These high level functions call into the lower level location independent mda ignore functions defined by earlier patches. Note that counting ignored mdas in a vg requires traversing both lists and checking for the ignored bit on the mda. The count of 'ignored' mdas then is defined by having the bit set, not by which list the mda is on. The list does determine whether LVM actually does read/write to the mda, though we must count the bits in order to return accurate numbers for the various counts. Also, pv_mda_set_ignored must search both vg lists for ignored mda. If the state changes and needs to be committed to disk, the ignored mda will be on the non-ignored list. Note also in pv_mda_set_ignored(), we must properly manage the mda lists. If we change the ignored state of an mda, we must change any mdas on vg->fid->metadata_areas that correspond to this pv. Also, we may need to allocate a copy of the mda, as is done when fid->metadata_areas is populated from _vg_read(), if we are un-ignoring an ignored mda. Signed-off-by: Dave Wysochanski <dwysocha@redhat.com> |
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