David Teigland beb229e1e8 devices: improve handling of duplicate PVs ... Example: /dev/loop0 and /dev/loop1 are duplicates, created by copying one backing file to the other. 'identity /dev/loopX' creates an identity mapping for loopX named idmloopX, which adds a duplicate for the named device. The duplicate selection code for lvmetad is incomplete, and lvmetad is disabled for this example. [~]# losetup -f loopfile0 [~]# pvs PV VG Fmt Attr PSize PFree /dev/loop0 foo lvm2 a-- 308.00m 296.00m [~]# losetup -f loopfile1 [~]# pvs Found duplicate PV LnSOEqzEYED3RvIOa5PZP2s7uyuBLmAV: using /dev/loop1 not /dev/loop0 Using duplicate PV /dev/loop1 which is more recent, replacing /dev/loop0 PV VG Fmt Attr PSize PFree /dev/loop1 foo lvm2 a-- 308.00m 308.00m [~]# ./identity /dev/loop0 [~]# pvs Found duplicate PV LnSOEqzEYED3RvIOa5PZP2s7uyuBLmAV: using /dev/loop1 not /dev/loop0 Using duplicate PV /dev/loop1 without holders, replacing /dev/loop0 Found duplicate PV LnSOEqzEYED3RvIOa5PZP2s7uyuBLmAV: using /dev/mapper/idmloop0 not /dev/loop1 Using duplicate PV /dev/mapper/idmloop0 from subsystem DM, replacing /dev/loop1 PV VG Fmt Attr PSize PFree /dev/mapper/idmloop0 foo lvm2 a-- 308.00m 296.00m [~]# ./identity /dev/loop1 [~]# pvs WARNING: duplicate PV LnSOEqzEYED3RvIOa5PZP2s7uyuBLmAV is being used from both devices /dev/loop0 and /dev/loop1 Found duplicate PV LnSOEqzEYED3RvIOa5PZP2s7uyuBLmAV: using /dev/loop1 not /dev/loop0 Using duplicate PV /dev/loop1 which is more recent, replacing /dev/loop0 Found duplicate PV LnSOEqzEYED3RvIOa5PZP2s7uyuBLmAV: using /dev/mapper/idmloop0 not /dev/loop1 Using duplicate PV /dev/mapper/idmloop0 from subsystem DM, replacing /dev/loop1 Found duplicate PV LnSOEqzEYED3RvIOa5PZP2s7uyuBLmAV: using /dev/mapper/idmloop1 not /dev/mapper/idmloop0 Using duplicate PV /dev/mapper/idmloop1 which is more recent, replacing /dev/mapper/idmloop0 PV VG Fmt Attr PSize PFree /dev/mapper/idmloop1 foo lvm2 a-- 308.00m 308.00m		2015-04-28 10:41:32 -05:00
..
dev-cache.c	pvscan: check sysfs dev entry before rescan	2015-03-18 16:19:58 +01:00
dev-cache.h	report: select: refactor: move str_list to libdm	2014-06-17 16:27:20 +02:00
dev-ext-udev-constants.h	cleanup: add dev-ext-udev-constants.h with constants/names of the properties/values used from udev db	2015-01-30 13:17:12 +01:00
dev-ext.c	device: add infrastructure to support external device info	2015-01-30 13:01:12 +01:00
dev-io.c	devices: avoid extra open() syscall	2015-03-06 13:17:39 +01:00
dev-luks.c	device: cleanup signature wiping functions	2013-11-27 12:56:58 +01:00
dev-md.c	cleanup: add dev-ext-udev-constants.h with constants/names of the properties/values used from udev db	2015-01-30 13:17:12 +01:00
dev-swap.c	dev-swap: use SECTOR_SHIFT	2014-03-22 20:43:05 +01:00
dev-type.c	devices: improve handling of duplicate PVs	2015-04-28 10:41:32 -05:00
dev-type.h	filters: no need to refresh filters/rescan if no signature is wiped during pvcreate at all	2015-02-17 09:46:34 +01:00
device-types.h	cleanup: reorder commonly available devs in system to the front	2014-02-24 21:13:35 +01:00
device.h	devices: avoid extra open() syscall	2015-03-06 13:17:39 +01:00