David Teigland db741e75a2 pvscan: autoactivate without lvmetad ... When lvmetad is not used, use temporary files to record which PVs have appeared. Use these temp files to determine when a VG is complete, to trigger autoactivation. This change allows us to remove lvmetad while keeping the same autoactivation behavior that lvmetad provides. The temp files are created in /run/lvm/pvs_online/ and are named for the PVID of the PV. The files contain the major:minor of the device the PV was read from. e.g. if VG foo has dev1 and dev2, then: . pvscan --cache -aay dev1 reads vg metadata from dev1 creates /run/lvm/pvs_online/<pvid-of-dev1> checks if all vg->pvs are online: no . pvscan --cache -aay dev2 reads vg metadata from dev2 creates /run/lvm/pvs_online/<pvid-of-dev2> checks if all vg->pvs are online: yes autoactivates vg A 'pvscan --cache dev' (without -aay) still records that dev is online. A 'pvscan --cache --major X --minor Y' after a device is gone will remove the temp file for it. A 'pvscan --cache [-aay]' (no devs) resets the state of temp files by removing them all, then scanning all devs and creating temp files for PVs that are found. If no online files exist, the first pvscan --cache scans all devs and creates temp files for any PVs found. The scope of the temp files is only pvscan, and they are only used for pvscan-based autoactivation. No other commands are concerned with or aware of these temp files. When lvm creates or removes PVs, no attempt is made to update the temp files.		2018-07-09 16:11:24 -05:00
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lvmcache.c	pvscan: autoactivate without lvmetad	2018-07-09 16:11:24 -05:00
lvmcache.h	pvscan: autoactivate without lvmetad	2018-07-09 16:11:24 -05:00
lvmetad.c	Add cmd arg to more functions	2018-06-15 11:03:55 -05:00
lvmetad.h	build: Don't generate symlinks in include/ dir	2018-05-14 10:30:20 +01:00