[Kernel-packages] [Bug 1920821] Re: BLKDISCARD fails on LUKS volume hosting LVM PV

2021-03-23 Thread Julian Andres Klode 
5.11.6 bad, 5.11.7 good

@juerg I think you are getting your kernels confused; 5.11.0-11 seems to
be based on 5.11 + some cherry-picks, not 5.11.7; 5.11.7 tracking bug is
bug 1919492, which is not yet fixed.

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Title:
  BLKDISCARD fails on LUKS volume hosting LVM PV

Status in Linux:
  Fix Released
Status in linux package in Ubuntu:
  New
Status in linux source package in Hirsute:
  New

Bug description:
  Creating a logical volume and destroying it fails to discard the
  volume, on an encrypted installation. This can significantly increase
  wear on SSDs when a lot of LVs are created and destroyed.

  
  jak@jak-t480s:~:master$ sudo lvcreate -L 10G -n foo ubuntu-vg 


  
Logical volume "foo" created.   


  
  jak@jak-t480s:~:master$ sudo strace -e ioctl blkdiscard /dev/ubuntu-vg/foo


  
  ioctl(3, BLKGETSIZE64, [10737418240])   = 0   


  
  ioctl(3, BLKSSZGET, [512])  = 0   


  
  ioctl(3, BLKGETSIZE64, [10737418240])   = 0   


  
  ioctl(3, BLKSSZGET, [512])  = 0   


  
  ioctl(3, BLKDISCARD, [0, 10737418240])  = 0   


  
  +++ exited with 0 +++
  jak@jak-t480s:~:master$ sudo strace -e ioctl lvremove ubuntu-vg/foo   


  
  ioctl(3, BLKGETSIZE64, [512110190592])  = 0   


  
  ioctl(3, BLKGETSIZE64, [119226368]) = 0   


  
  ioctl(3, DM_VERSION, {version=4.0.0, data_size=16384, flags=DM_EXISTS_FLAG} 
=> {version=4.43.0, data_size=16384, flags=DM_EXISTS_FLAG}) = 0 


  ioctl(3, DM_TABLE_STATUS, {version=4.0.0, data_size=16384, data_start=312, 
dev=makedev(0xfd, 0), 
flags=DM_EXISTS_FLAG|DM_PERSISTENT_DEV_FLAG|DM_SKIP_BDGET_FLAG|DM_NOFLUSH_FLAG} 
=> {version=4.43.0, data_size=353, data_start=312, dev=makedev(0xfd, 0), 
name="crypt", uuid="CRYPT-LUKS1-c9
  12d3ffa2a8470ca2d5b692dce44cf6-crypt", target_count=1, open_count=7, 
event_nr=0, 
flags=DM_EXISTS_FLAG|DM_PERSISTENT_DEV_FLAG|DM_ACTIVE_PRESENT_FLAG|DM_SKIP_BDGET_FLAG|DM_NOFLUSH_FLAG,
 ...}) = 0  
 
  ioctl(4, BLKGETSIZE64, [510802264064])  = 0

[Kernel-packages] [Bug 1920821] Re: BLKDISCARD fails on LUKS volume hosting LVM PV

2021-03-23 Thread Julian Andres Klode 
Reference 1 - Ubuntu kernel 5.11.0-11-generic:

jak@jak-t480s:~:master$ sudo lvcreate -L 1G -n foo ubuntu-vg 
  Logical volume "foo" created.
jak@jak-t480s:~:master$ sudo lvremove ubuntu-vg/foo
Do you really want to remove and DISCARD active logical volume ubuntu-vg/foo? 
[y/n]: y
  /dev/mapper/crypt: BLKDISCARD ioctl at offset 72717697024 size 1073741824 
failed: Device or resource busy.
  Logical volume "foo" successfully removed
jak@jak-t480s:~:master$ uname -a
Linux jak-t480s 5.11.0-11-generic #12-Ubuntu SMP Mon Mar 1 19:26:56 UTC 2021 
x86_64 x86_64 x86_64 GNU/Linux

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Title:
  BLKDISCARD fails on LUKS volume hosting LVM PV

Status in Linux:
  Fix Released
Status in linux package in Ubuntu:
  New
Status in linux source package in Hirsute:
  New

Bug description:
  Creating a logical volume and destroying it fails to discard the
  volume, on an encrypted installation. This can significantly increase
  wear on SSDs when a lot of LVs are created and destroyed.

  
  jak@jak-t480s:~:master$ sudo lvcreate -L 10G -n foo ubuntu-vg 


  
Logical volume "foo" created.   


  
  jak@jak-t480s:~:master$ sudo strace -e ioctl blkdiscard /dev/ubuntu-vg/foo


  
  ioctl(3, BLKGETSIZE64, [10737418240])   = 0   


  
  ioctl(3, BLKSSZGET, [512])  = 0   


  
  ioctl(3, BLKGETSIZE64, [10737418240])   = 0   


  
  ioctl(3, BLKSSZGET, [512])  = 0   


  
  ioctl(3, BLKDISCARD, [0, 10737418240])  = 0   


  
  +++ exited with 0 +++
  jak@jak-t480s:~:master$ sudo strace -e ioctl lvremove ubuntu-vg/foo   


  
  ioctl(3, BLKGETSIZE64, [512110190592])  = 0   


  
  ioctl(3, BLKGETSIZE64, [119226368]) = 0   


  
  ioctl(3, DM_VERSION, {version=4.0.0, data_size=16384, flags=DM_EXISTS_FLAG} 
=> {version=4.43.0, data_size=16384, flags=DM_EXISTS_FLAG}) = 0 


  ioctl(3, DM_TABLE_STATUS, {version=4.0.0, data_size=16384, data_start=312, 
dev=makedev(0xfd, 0), 
flags=DM_EXISTS_FLAG|DM_PERSISTENT_DEV_FLAG|DM_SKIP_BDGET_FLAG|DM_NOFLUSH_FLAG} 
=> {version=4.43.0, data_size=353, data_start=312, dev=makedev(0xfd, 0), 
name="crypt", uuid="CRYPT-LUKS1-c9

[Kernel-packages] [Bug 1920821] Re: BLKDISCARD fails on LUKS volume hosting LVM PV

2021-03-23 Thread Julian Andres Klode 
Let me try 5.11.6 and 5.11.7 mainline then...

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Title:
  BLKDISCARD fails on LUKS volume hosting LVM PV

Status in Linux:
  Fix Released
Status in linux package in Ubuntu:
  New
Status in linux source package in Hirsute:
  New

Bug description:
  Creating a logical volume and destroying it fails to discard the
  volume, on an encrypted installation. This can significantly increase
  wear on SSDs when a lot of LVs are created and destroyed.

  
  jak@jak-t480s:~:master$ sudo lvcreate -L 10G -n foo ubuntu-vg 


  
Logical volume "foo" created.   


  
  jak@jak-t480s:~:master$ sudo strace -e ioctl blkdiscard /dev/ubuntu-vg/foo


  
  ioctl(3, BLKGETSIZE64, [10737418240])   = 0   


  
  ioctl(3, BLKSSZGET, [512])  = 0   


  
  ioctl(3, BLKGETSIZE64, [10737418240])   = 0   


  
  ioctl(3, BLKSSZGET, [512])  = 0   


  
  ioctl(3, BLKDISCARD, [0, 10737418240])  = 0   


  
  +++ exited with 0 +++
  jak@jak-t480s:~:master$ sudo strace -e ioctl lvremove ubuntu-vg/foo   


  
  ioctl(3, BLKGETSIZE64, [512110190592])  = 0   


  
  ioctl(3, BLKGETSIZE64, [119226368]) = 0   


  
  ioctl(3, DM_VERSION, {version=4.0.0, data_size=16384, flags=DM_EXISTS_FLAG} 
=> {version=4.43.0, data_size=16384, flags=DM_EXISTS_FLAG}) = 0 


  ioctl(3, DM_TABLE_STATUS, {version=4.0.0, data_size=16384, data_start=312, 
dev=makedev(0xfd, 0), 
flags=DM_EXISTS_FLAG|DM_PERSISTENT_DEV_FLAG|DM_SKIP_BDGET_FLAG|DM_NOFLUSH_FLAG} 
=> {version=4.43.0, data_size=353, data_start=312, dev=makedev(0xfd, 0), 
name="crypt", uuid="CRYPT-LUKS1-c9
  12d3ffa2a8470ca2d5b692dce44cf6-crypt", target_count=1, open_count=7, 
event_nr=0, 
flags=DM_EXISTS_FLAG|DM_PERSISTENT_DEV_FLAG|DM_ACTIVE_PRESENT_FLAG|DM_SKIP_BDGET_FLAG|DM_NOFLUSH_FLAG,
 ...}) = 0  
 
  ioctl(4, BLKGETSIZE64, [510802264064])  = 0

[Kernel-packages] [Bug 1920821] Re: BLKDISCARD fails on LUKS volume hosting LVM PV

2021-03-23 Thread Juerg Haefliger 
Hmm.. The referenced commit [1] is in 5.11.0-11 (which is based on
stable 5.11.7).

[1]
commit 73dfbeb7fdb1c9f1f1dc991e3ea10f4c3fd8a7fb
Author: Jan Kara 
Date:   Mon Feb 22 10:48:09 2021 +0100

block: Try to handle busy underlying device on discard

BugLink: https://bugs.launchpad.net/bugs/1919492

commit 56887cffe946bb0a90c74429fa94d6110a73119d upstream.

Commit 384d87ef2c95 ("block: Do not discard buffers under a mounted
filesystem") made paths issuing discard or zeroout requests to the
underlying device try to grab block device in exclusive mode. If that
failed we returned EBUSY to userspace. This however caused unexpected
fallout in userspace where e.g. FUSE filesystems issue discard requests
from userspace daemons although the device is open exclusively by the
kernel. Also shrinking of logical volume by LVM issues discard requests
to a device which may be claimed exclusively because there's another LV
on the same PV. So to avoid these userspace regressions, fall back to
invalidate_inode_pages2_range() instead of returning EBUSY to userspace
and return EBUSY only of that call fails as well (meaning that there's
indeed someone using the particular device range we are trying to
discard).

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https://bugs.launchpad.net/bugs/1920821

Title:
  BLKDISCARD fails on LUKS volume hosting LVM PV

Status in Linux:
  Fix Released
Status in linux package in Ubuntu:
  New
Status in linux source package in Hirsute:
  New

Bug description:
  Creating a logical volume and destroying it fails to discard the
  volume, on an encrypted installation. This can significantly increase
  wear on SSDs when a lot of LVs are created and destroyed.

  
  jak@jak-t480s:~:master$ sudo lvcreate -L 10G -n foo ubuntu-vg 


  
Logical volume "foo" created.   


  
  jak@jak-t480s:~:master$ sudo strace -e ioctl blkdiscard /dev/ubuntu-vg/foo


  
  ioctl(3, BLKGETSIZE64, [10737418240])   = 0   


  
  ioctl(3, BLKSSZGET, [512])  = 0   


  
  ioctl(3, BLKGETSIZE64, [10737418240])   = 0   


  
  ioctl(3, BLKSSZGET, [512])  = 0   


  
  ioctl(3, BLKDISCARD, [0, 10737418240])  = 0   


  
  +++ exited with 0 +++
  jak@jak-t480s:~:master$ sudo strace -e ioctl lvremove ubuntu-vg/foo   


  
  ioctl(3, BLKGETSIZE64, [512110190592])  = 0   


  
  ioctl(3, BLKGETSIZE64, [119226368]) = 0

[Kernel-packages] [Bug 1920821] Re: BLKDISCARD fails on LUKS volume hosting LVM PV

2021-03-23 Thread Juerg Haefliger 
** Also affects: linux (Ubuntu Hirsute)
   Importance: Undecided
   Status: New

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https://bugs.launchpad.net/bugs/1920821

Title:
  BLKDISCARD fails on LUKS volume hosting LVM PV

Status in Linux:
  Fix Released
Status in linux package in Ubuntu:
  New
Status in linux source package in Hirsute:
  New

Bug description:
  Creating a logical volume and destroying it fails to discard the
  volume, on an encrypted installation. This can significantly increase
  wear on SSDs when a lot of LVs are created and destroyed.

  
  jak@jak-t480s:~:master$ sudo lvcreate -L 10G -n foo ubuntu-vg 


  
Logical volume "foo" created.   


  
  jak@jak-t480s:~:master$ sudo strace -e ioctl blkdiscard /dev/ubuntu-vg/foo


  
  ioctl(3, BLKGETSIZE64, [10737418240])   = 0   


  
  ioctl(3, BLKSSZGET, [512])  = 0   


  
  ioctl(3, BLKGETSIZE64, [10737418240])   = 0   


  
  ioctl(3, BLKSSZGET, [512])  = 0   


  
  ioctl(3, BLKDISCARD, [0, 10737418240])  = 0   


  
  +++ exited with 0 +++
  jak@jak-t480s:~:master$ sudo strace -e ioctl lvremove ubuntu-vg/foo   


  
  ioctl(3, BLKGETSIZE64, [512110190592])  = 0   


  
  ioctl(3, BLKGETSIZE64, [119226368]) = 0   


  
  ioctl(3, DM_VERSION, {version=4.0.0, data_size=16384, flags=DM_EXISTS_FLAG} 
=> {version=4.43.0, data_size=16384, flags=DM_EXISTS_FLAG}) = 0 


  ioctl(3, DM_TABLE_STATUS, {version=4.0.0, data_size=16384, data_start=312, 
dev=makedev(0xfd, 0), 
flags=DM_EXISTS_FLAG|DM_PERSISTENT_DEV_FLAG|DM_SKIP_BDGET_FLAG|DM_NOFLUSH_FLAG} 
=> {version=4.43.0, data_size=353, data_start=312, dev=makedev(0xfd, 0), 
name="crypt", uuid="CRYPT-LUKS1-c9
  12d3ffa2a8470ca2d5b692dce44cf6-crypt", target_count=1, open_count=7, 
event_nr=0, 
flags=DM_EXISTS_FLAG|DM_PERSISTENT_DEV_FLAG|DM_ACTIVE_PRESENT_FLAG|DM_SKIP_BDGET_FLAG|DM_NOFLUSH_FLAG,
 ...}) = 0  
 
  ioctl(4, BLKGETSIZE64, [510802264064])  = 0

[Kernel-packages] [Bug 1920821] Re: BLKDISCARD fails on LUKS volume hosting LVM PV

2021-03-22 Thread Bug Watch Updater 
** Changed in: linux
   Status: Unknown => Fix Released

** Changed in: linux
   Importance: Unknown => Medium

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https://bugs.launchpad.net/bugs/1920821

Title:
  BLKDISCARD fails on LUKS volume hosting LVM PV

Status in Linux:
  Fix Released
Status in linux package in Ubuntu:
  New

Bug description:
  Creating a logical volume and destroying it fails to discard the
  volume, on an encrypted installation. This can significantly increase
  wear on SSDs when a lot of LVs are created and destroyed.

  
  jak@jak-t480s:~:master$ sudo lvcreate -L 10G -n foo ubuntu-vg 


  
Logical volume "foo" created.   


  
  jak@jak-t480s:~:master$ sudo strace -e ioctl blkdiscard /dev/ubuntu-vg/foo


  
  ioctl(3, BLKGETSIZE64, [10737418240])   = 0   


  
  ioctl(3, BLKSSZGET, [512])  = 0   


  
  ioctl(3, BLKGETSIZE64, [10737418240])   = 0   


  
  ioctl(3, BLKSSZGET, [512])  = 0   


  
  ioctl(3, BLKDISCARD, [0, 10737418240])  = 0   


  
  +++ exited with 0 +++
  jak@jak-t480s:~:master$ sudo strace -e ioctl lvremove ubuntu-vg/foo   


  
  ioctl(3, BLKGETSIZE64, [512110190592])  = 0   


  
  ioctl(3, BLKGETSIZE64, [119226368]) = 0   


  
  ioctl(3, DM_VERSION, {version=4.0.0, data_size=16384, flags=DM_EXISTS_FLAG} 
=> {version=4.43.0, data_size=16384, flags=DM_EXISTS_FLAG}) = 0 


  ioctl(3, DM_TABLE_STATUS, {version=4.0.0, data_size=16384, data_start=312, 
dev=makedev(0xfd, 0), 
flags=DM_EXISTS_FLAG|DM_PERSISTENT_DEV_FLAG|DM_SKIP_BDGET_FLAG|DM_NOFLUSH_FLAG} 
=> {version=4.43.0, data_size=353, data_start=312, dev=makedev(0xfd, 0), 
name="crypt", uuid="CRYPT-LUKS1-c9
  12d3ffa2a8470ca2d5b692dce44cf6-crypt", target_count=1, open_count=7, 
event_nr=0, 
flags=DM_EXISTS_FLAG|DM_PERSISTENT_DEV_FLAG|DM_ACTIVE_PRESENT_FLAG|DM_SKIP_BDGET_FLAG|DM_NOFLUSH_FLAG,
 ...}) = 0  
 
  ioctl(4, BLKGETSIZE64, [510802264064])  = 0

[Kernel-packages] [Bug 1920821] Re: BLKDISCARD fails on LUKS volume hosting LVM PV

2021-03-22 Thread Julian Andres Klode 
This seems to be https://bugzilla.kernel.org/show_bug.cgi?id=211167

** Also affects: linux via
   https://bugzilla.kernel.org/show_bug.cgi?id=211167
   Importance: Unknown
   Status: Unknown

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https://bugs.launchpad.net/bugs/1920821

Title:
  BLKDISCARD fails on LUKS volume hosting LVM PV

Status in Linux:
  Unknown
Status in linux package in Ubuntu:
  New

Bug description:
  Creating a logical volume and destroying it fails to discard the
  volume, on an encrypted installation. This can significantly increase
  wear on SSDs when a lot of LVs are created and destroyed.

  
  jak@jak-t480s:~:master$ sudo lvcreate -L 10G -n foo ubuntu-vg 


  
Logical volume "foo" created.   


  
  jak@jak-t480s:~:master$ sudo strace -e ioctl blkdiscard /dev/ubuntu-vg/foo


  
  ioctl(3, BLKGETSIZE64, [10737418240])   = 0   


  
  ioctl(3, BLKSSZGET, [512])  = 0   


  
  ioctl(3, BLKGETSIZE64, [10737418240])   = 0   


  
  ioctl(3, BLKSSZGET, [512])  = 0   


  
  ioctl(3, BLKDISCARD, [0, 10737418240])  = 0   


  
  +++ exited with 0 +++
  jak@jak-t480s:~:master$ sudo strace -e ioctl lvremove ubuntu-vg/foo   


  
  ioctl(3, BLKGETSIZE64, [512110190592])  = 0   


  
  ioctl(3, BLKGETSIZE64, [119226368]) = 0   


  
  ioctl(3, DM_VERSION, {version=4.0.0, data_size=16384, flags=DM_EXISTS_FLAG} 
=> {version=4.43.0, data_size=16384, flags=DM_EXISTS_FLAG}) = 0 


  ioctl(3, DM_TABLE_STATUS, {version=4.0.0, data_size=16384, data_start=312, 
dev=makedev(0xfd, 0), 
flags=DM_EXISTS_FLAG|DM_PERSISTENT_DEV_FLAG|DM_SKIP_BDGET_FLAG|DM_NOFLUSH_FLAG} 
=> {version=4.43.0, data_size=353, data_start=312, dev=makedev(0xfd, 0), 
name="crypt", uuid="CRYPT-LUKS1-c9
  12d3ffa2a8470ca2d5b692dce44cf6-crypt", target_count=1, open_count=7, 
event_nr=0, 
flags=DM_EXISTS_FLAG|DM_PERSISTENT_DEV_FLAG|DM_ACTIVE_PRESENT_FLAG|DM_SKIP_BDGET_FLAG|DM_NOFLUSH_FLAG,
 ...}) = 0  
 
  ioctl(4, BLKGETSIZE64, [510802264064])  = 0

[Kernel-packages] [Bug 1920821] Re: BLKDISCARD fails on LUKS volume hosting LVM PV

2021-03-22 Thread Julian Andres Klode 
Should be fixed in 5.10.24, 5.11.7 and 5.12-rc3 according to the
internet

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https://bugs.launchpad.net/bugs/1920821

Title:
  BLKDISCARD fails on LUKS volume hosting LVM PV

Status in Linux:
  Unknown
Status in linux package in Ubuntu:
  New

Bug description:
  Creating a logical volume and destroying it fails to discard the
  volume, on an encrypted installation. This can significantly increase
  wear on SSDs when a lot of LVs are created and destroyed.

  
  jak@jak-t480s:~:master$ sudo lvcreate -L 10G -n foo ubuntu-vg 


  
Logical volume "foo" created.   


  
  jak@jak-t480s:~:master$ sudo strace -e ioctl blkdiscard /dev/ubuntu-vg/foo


  
  ioctl(3, BLKGETSIZE64, [10737418240])   = 0   


  
  ioctl(3, BLKSSZGET, [512])  = 0   


  
  ioctl(3, BLKGETSIZE64, [10737418240])   = 0   


  
  ioctl(3, BLKSSZGET, [512])  = 0   


  
  ioctl(3, BLKDISCARD, [0, 10737418240])  = 0   


  
  +++ exited with 0 +++
  jak@jak-t480s:~:master$ sudo strace -e ioctl lvremove ubuntu-vg/foo   


  
  ioctl(3, BLKGETSIZE64, [512110190592])  = 0   


  
  ioctl(3, BLKGETSIZE64, [119226368]) = 0   


  
  ioctl(3, DM_VERSION, {version=4.0.0, data_size=16384, flags=DM_EXISTS_FLAG} 
=> {version=4.43.0, data_size=16384, flags=DM_EXISTS_FLAG}) = 0 


  ioctl(3, DM_TABLE_STATUS, {version=4.0.0, data_size=16384, data_start=312, 
dev=makedev(0xfd, 0), 
flags=DM_EXISTS_FLAG|DM_PERSISTENT_DEV_FLAG|DM_SKIP_BDGET_FLAG|DM_NOFLUSH_FLAG} 
=> {version=4.43.0, data_size=353, data_start=312, dev=makedev(0xfd, 0), 
name="crypt", uuid="CRYPT-LUKS1-c9
  12d3ffa2a8470ca2d5b692dce44cf6-crypt", target_count=1, open_count=7, 
event_nr=0, 
flags=DM_EXISTS_FLAG|DM_PERSISTENT_DEV_FLAG|DM_ACTIVE_PRESENT_FLAG|DM_SKIP_BDGET_FLAG|DM_NOFLUSH_FLAG,
 ...}) = 0  
 
  ioctl(4, BLKGETSIZE64, [510802264064])  = 0

[Kernel-packages] [Bug 1920821] Re: BLKDISCARD fails on LUKS volume hosting LVM PV

2021-03-22 Thread Julian Andres Klode 
I verified that mainline ppa build 5.11.8-051108-generic works

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https://bugs.launchpad.net/bugs/1920821

Title:
  BLKDISCARD fails on LUKS volume hosting LVM PV

Status in Linux:
  Unknown
Status in linux package in Ubuntu:
  New

Bug description:
  Creating a logical volume and destroying it fails to discard the
  volume, on an encrypted installation. This can significantly increase
  wear on SSDs when a lot of LVs are created and destroyed.

  
  jak@jak-t480s:~:master$ sudo lvcreate -L 10G -n foo ubuntu-vg 


  
Logical volume "foo" created.   


  
  jak@jak-t480s:~:master$ sudo strace -e ioctl blkdiscard /dev/ubuntu-vg/foo


  
  ioctl(3, BLKGETSIZE64, [10737418240])   = 0   


  
  ioctl(3, BLKSSZGET, [512])  = 0   


  
  ioctl(3, BLKGETSIZE64, [10737418240])   = 0   


  
  ioctl(3, BLKSSZGET, [512])  = 0   


  
  ioctl(3, BLKDISCARD, [0, 10737418240])  = 0   


  
  +++ exited with 0 +++
  jak@jak-t480s:~:master$ sudo strace -e ioctl lvremove ubuntu-vg/foo   


  
  ioctl(3, BLKGETSIZE64, [512110190592])  = 0   


  
  ioctl(3, BLKGETSIZE64, [119226368]) = 0   


  
  ioctl(3, DM_VERSION, {version=4.0.0, data_size=16384, flags=DM_EXISTS_FLAG} 
=> {version=4.43.0, data_size=16384, flags=DM_EXISTS_FLAG}) = 0 


  ioctl(3, DM_TABLE_STATUS, {version=4.0.0, data_size=16384, data_start=312, 
dev=makedev(0xfd, 0), 
flags=DM_EXISTS_FLAG|DM_PERSISTENT_DEV_FLAG|DM_SKIP_BDGET_FLAG|DM_NOFLUSH_FLAG} 
=> {version=4.43.0, data_size=353, data_start=312, dev=makedev(0xfd, 0), 
name="crypt", uuid="CRYPT-LUKS1-c9
  12d3ffa2a8470ca2d5b692dce44cf6-crypt", target_count=1, open_count=7, 
event_nr=0, 
flags=DM_EXISTS_FLAG|DM_PERSISTENT_DEV_FLAG|DM_ACTIVE_PRESENT_FLAG|DM_SKIP_BDGET_FLAG|DM_NOFLUSH_FLAG,
 ...}) = 0  
 
  ioctl(4, BLKGETSIZE64, [510802264064])  = 0   


  
  ioctl(4,