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Commit Graph

14 Commits

Author SHA1 Message Date
David Teigland
fa7fe5cbbe writecache: support settings metadata_only and pause_writeback
Two new settings for tuning dm-writecache.
2022-12-08 16:53:36 -06:00
Zdenek Kabelac
ef2e0d3d68 typo: fixes
forgotten merge from last batch.
2021-02-08 23:53:41 +01:00
Zdenek Kabelac
9b173bb931 targets: use target_present_version
Skip duplicated  dm version   ioctl() on every startup.
2021-02-08 23:43:38 +01:00
David Teigland
d7058cfa98 writecache: supported in dm-writecache version 3
not version 2
2020-11-09 09:47:01 -06:00
David Teigland
c32d7fed4f writecache: use two step detach
When detaching a writecache, use the cleaner setting
by default to writeback data prior to suspending the
lv to detach the writecache.  This avoids potentially
blocking for a long period with the device suspended.

Detaching a writecache first sets the cleaner option, waits
for a short period of time (less than a second), and checks
if the writecache has quickly become clean.  If so, the
writecache is detached immediately.  This optimizes the case
where little writeback is needed.

If the writecache does not quickly become clean, then the
detach command leaves the writecache attached with the
cleaner option set.  This leaves the LV in the same state
as if the user had set the cleaner option directly with
lvchange --cachesettings cleaner=1 LV.

After leaving the LV with the cleaner option set, the
detach command will wait and watch the writeback progress,
and will finally detach the writecache when the writeback
is finished.  The detach command does not need to wait
during the writeback phase, and can be canceled, in which
case the LV will remain with the writecache attached and
the cleaner option set.  When the user runs the detach
command again it will complete the detach.

To detach a writecache directly, without using the cleaner
step (which has been the approach previously), add the
option --cachesettings cleaner=0 to the detach command.
2020-10-01 11:33:02 -05:00
David Teigland
a7b2fc8f57 writecache: add settings cleaner and max_age
available in dm-writecache 1.2
2020-06-10 12:15:50 -05:00
David Teigland
8153c5f1e6 writecache: working real dm uuid suffix for wcorig lv 2020-02-20 17:13:43 -06:00
David Teigland
4829f27b76 writecache: drop real dm suffix
fixes the problem of adding writecache to an active LV
2020-02-17 13:07:06 -06:00
David Teigland
1c9b36618e writecache: modprobe dm-writecache 2019-11-26 11:21:09 -06:00
Zdenek Kabelac
a454a1b4ea cachevol: put _cvol as protected suffix.
This revert "drop cvol dm uuid suffix for cachevol LVs"
commit 5191057d9d.
Start using -cvol for  DM UUID.
2019-10-14 15:16:05 +02:00
David Teigland
5191057d9d drop cvol dm uuid suffix for cachevol LVs
The "-cvol" suffix on the uuid is interfering with
activation code, so drop the suffix for now.
2019-09-23 14:13:31 -05:00
David Teigland
6f7d7089b4 writecache: use dm suffixes and lv attributes
- use internal CACHE_VOL flag on cachevol LV
- add suffixes to dm uuids for internal LVs
- display appropriate letters in the LV attr field
- display writecache's cachevol in lvs output
2019-09-20 14:08:51 -05:00
David Teigland
adfb9bf20c remove unused string writecache 2019-05-01 16:50:14 -05:00
David Teigland
3ae5569570 Add dm-writecache support
dm-writecache is used like dm-cache with a standard LV
as the cache.

$ lvcreate -n main -L 128M -an foo /dev/loop0

$ lvcreate -n fast -L 32M -an foo /dev/pmem0

$ lvconvert --type writecache --cachepool fast foo/main

$ lvs -a foo -o+devices
  LV            VG  Attr       LSize   Origin        Devices
  [fast]        foo -wi-------  32.00m               /dev/pmem0(0)
  main          foo Cwi------- 128.00m [main_wcorig] main_wcorig(0)
  [main_wcorig] foo -wi------- 128.00m               /dev/loop0(0)

$ lvchange -ay foo/main

$ dmsetup table
foo-main_wcorig: 0 262144 linear 7:0 2048
foo-main: 0 262144 writecache p 253:4 253:3 4096 0
foo-fast: 0 65536 linear 259:0 2048

$ lvchange -an foo/main

$ lvconvert --splitcache foo/main

$ lvs -a foo -o+devices
  LV   VG  Attr       LSize   Devices
  fast foo -wi-------  32.00m /dev/pmem0(0)
  main foo -wi------- 128.00m /dev/loop0(0)
2018-11-06 14:18:41 -06:00