Jonathan Earl Brassow 6d04311efa Add the ability to split an image from the mirror and track changes. ... ~> lvconvert --splitmirrors 1 --trackchanges vg/lv The '--trackchanges' option allows a user the ability to use an image of a RAID1 array for the purposes of temporary read-only access. The image can be merged back into the array at a later time and only the blocks that have changed in the array since the split will be resync'ed. This operation can be thought of as a partial split. The image is never completely extracted from the array, in that the array reserves the position the device occupied and tracks the differences between the array and the split image via a bitmap. The image itself is rendered read-only and the name (<LV>_rimage_*) cannot be changed. The user can complete the split (permanently splitting the image from the array) by re-issuing the 'lvconvert' command without the '--trackchanges' argument and specifying the '--name' argument. ~> lvconvert --splitmirrors 1 --name my_split vg/lv Merging the tracked image back into the array is done with the '--merge' option (included in a follow-on patch). ~> lvconvert --merge vg/lv_rimage_<n> The internal mechanics of this are relatively simple. The 'raid' device- mapper target allows for the specification of an empty slot in an array via '- -'. This is what will be used if a partial activation of an array is ever required. (It would also be possible to use 'error' targets in place of the '- -'.) If a RAID image is found to be both read-only and visible, then it is considered separate from the array and '- -' is used to hold it's position in the array. So, all that needs to be done to temporarily split an image from the array /and/ cause the kernel target's bitmap to track (aka "mark") changes made is to make the specified image visible and read-only. To merge the device back into the array, the image needs to be returned to the read/write state of the top-level LV and made invisible.		2011-08-18 19:38:26 +00:00
..
.exported_symbols	generate liblvm2cmd exported symbols too	2010-06-25 18:23:10 +00:00
args.h	Add the ability to split an image from the mirror and track changes.	2011-08-18 19:38:26 +00:00
cmdnames.h	Fix inconsistent licence notices: executables are GPLv2; libraries LGPLv2.1.	2007-08-20 20:55:30 +00:00
commands.h	Add the ability to split an image from the mirror and track changes.	2011-08-18 19:38:26 +00:00
dmsetup.c	pre-release fixes incl make distclean and configure --with-raid=none/shared	2011-08-11 19:18:17 +00:00
dumpconfig.c	Tidy some uses of arg_count and introduce arg_is_set.	2009-11-03 15:50:42 +00:00
formats.c	Use __attribute__ consistently throughout.	2010-07-09 15:34:40 +00:00
lvchange.c	s/MIRROR_NOTSYNCED/LV_NOTSYNCED/ - Flag will may refer to more than just mirrors	2011-03-29 12:51:57 +00:00
lvconvert.c	Add the ability to split an image from the mirror and track changes.	2011-08-18 19:38:26 +00:00
lvcreate.c	more pre-release fixes	2011-08-12 02:16:46 +00:00
lvdisplay.c	Rework the toollib interface (process_each_*) on top of new vg_read.	2009-07-01 17:00:50 +00:00
lvextend.c	Some whitespace tidy-ups.	2008-01-30 14:00:02 +00:00
lvm2cmd-static.c	Fix inconsistent licence notices: executables are GPLv2; libraries LGPLv2.1.	2007-08-20 20:55:30 +00:00
lvm2cmd.c	Use __attribute__ consistently throughout.	2010-07-09 15:34:40 +00:00
lvm2cmd.h	Remove C++ private keyword from headers.	2010-06-16 13:01:25 +00:00
lvm2cmdline.h	Support repetition of --addtag and --deltag arguments.	2010-11-11 17:29:05 +00:00
lvm-static.c	Use __attribute__ consistently throughout.	2010-07-09 15:34:40 +00:00
lvm.c	Support repetition of --addtag and --deltag arguments.	2010-11-11 17:29:05 +00:00
lvmchange.c	Use __attribute__ consistently throughout.	2010-07-09 15:34:40 +00:00
lvmcmdlib.c	mlockall() -> mlock()	2010-03-05 14:48:33 +00:00
lvmcmdline.c	Add 'empty' command	2011-08-04 14:54:48 +00:00
lvmdiskscan.c	Use new dev_open_readonly fn to prevent opening devices for read-write when not necessary.	2011-05-28 09:48:14 +00:00
lvreduce.c	Some whitespace tidy-ups.	2008-01-30 14:00:02 +00:00
lvremove.c	Use __attribute__ consistently throughout.	2010-07-09 15:34:40 +00:00
lvrename.c	Replace free_vg with release_vg	2011-08-10 20:25:29 +00:00
lvresize.c	Replace free_vg with release_vg	2011-08-10 20:25:29 +00:00
lvscan.c	Do not check for open_count when not needed.	2011-02-03 01:24:46 +00:00
Makefile.in	Fix linking order for liblvm2cmd	2010-10-15 09:41:21 +00:00
polldaemon.c	Replace free_vg with release_vg	2011-08-10 20:25:29 +00:00
polldaemon.h	Default to checking LV's progress before waiting in _wait_for_single_lv.	2010-01-22 21:59:42 +00:00
pvchange.c	Replace free_vg with release_vg	2011-08-10 20:25:29 +00:00
pvck.c	Add escape sequence for ':' and '@' found in device names used as PVs.	2010-09-23 12:02:33 +00:00
pvcreate.c	Replace free_vg with release_vg	2011-08-10 20:25:29 +00:00
pvdisplay.c	Replace free_vg with release_vg	2011-08-10 20:25:29 +00:00
pvmove.c	Replace free_vg with release_vg	2011-08-10 20:25:29 +00:00
pvremove.c	Defer writing PV labels to vg_write.	2011-06-01 19:29:31 +00:00
pvresize.c	Replace free_vg with release_vg	2011-08-10 20:25:29 +00:00
pvscan.c	Add new free_pv_fid fn and use it throughout to free all attached fids.	2011-03-11 14:56:56 +00:00
reporter.c	Replace free_vg with release_vg	2011-08-10 20:25:29 +00:00
segtypes.c	Use __attribute__ consistently throughout.	2010-07-09 15:34:40 +00:00
stub.h	Use __attribute__ consistently throughout.	2010-07-09 15:34:40 +00:00
toollib.c	Replace free_vg with release_vg	2011-08-10 20:25:29 +00:00
toollib.h	Const fixing	2011-02-18 14:47:28 +00:00
tools.h	remove unnecessary lvconvert.h	2011-07-08 19:42:11 +00:00
vgcfgbackup.c	Fix process_each_vg / _process_one_vg when vg_read() returns FAILED_LOCKING.	2009-09-15 01:38:59 +00:00
vgcfgrestore.c	Const fixing	2011-02-18 14:47:28 +00:00
vgchange.c	Major pvmove fix to issue ioctls in the correct order when multiple LVs	2011-06-11 00:03:06 +00:00
vgck.c	Make vgck warn about missing PVs.	2010-07-27 20:05:29 +00:00
vgconvert.c	Add new free_pv_fid fn and use it throughout to free all attached fids.	2011-03-11 14:56:56 +00:00
vgcreate.c	Replace free_vg with release_vg	2011-08-10 20:25:29 +00:00
vgdisplay.c	Use __attribute__ consistently throughout.	2010-07-09 15:34:40 +00:00
vgexport.c	Use __attribute__ consistently throughout.	2010-07-09 15:34:40 +00:00
vgextend.c	Replace free_vg with release_vg	2011-08-10 20:25:29 +00:00
vgimport.c	Use __attribute__ consistently throughout.	2010-07-09 15:34:40 +00:00
vgmerge.c	Replace free_vg with release_vg	2011-08-10 20:25:29 +00:00
vgmknodes.c	Use __attribute__ consistently throughout.	2010-07-09 15:34:40 +00:00
vgreduce.c	Replace free_vg with release_vg	2011-08-10 20:25:29 +00:00
vgremove.c	Use __attribute__ consistently throughout.	2010-07-09 15:34:40 +00:00
vgrename.c	Replace free_vg with release_vg	2011-08-10 20:25:29 +00:00
vgscan.c	Use __attribute__ consistently throughout.	2010-07-09 15:34:40 +00:00
vgsplit.c	Replace free_vg with release_vg	2011-08-10 20:25:29 +00:00