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Bug 1037503 - fix thin provisioning support for block device backends
Summary: fix thin provisioning support for block device backends
Keywords:
Status: CLOSED CURRENTRELEASE
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: qemu-kvm
Version: 7.0
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Paolo Bonzini
QA Contact: Virtualization Bugs
URL:
Whiteboard:
Depends On:
Blocks: 1055487 GlusterThinProvisioning 1136534
TreeView+ depends on / blocked
 
Reported: 2013-12-03 09:49 UTC by Paolo Bonzini
Modified: 2014-09-02 19:30 UTC (History)
10 users (show)

Fixed In Version: qemu-kvm-1.5.3-41.el7
Doc Type: Bug Fix
Doc Text:
Clone Of:
: 1055487 1103845 (view as bug list)
Environment:
Last Closed: 2014-06-13 11:21:41 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Description Paolo Bonzini 2013-12-03 09:49:05 UTC 
It's a simple patch:

commit 0c14fb47ece5ef42d7a0a4b3e8e43e022b375720
Author: Bharata B Rao <bharata.ibm.com>
Date:   Tue Jul 16 21:47:42 2013 +0530

    gluster: Add discard support for GlusterFS block driver.
    
    Implement bdrv_aio_discard for gluster.
    
    Signed-off-by: Bharata B Rao <bharata.ibm.com>
    Reviewed-by: Kevin Wolf <kwolf>
    Signed-off-by: Stefan Hajnoczi <stefanha>
Comment 3 Miroslav Rezanina 2014-01-22 14:23:05 UTC 
Fix included in qemu-kvm-1.5.3-41.el7
Comment 5 Sibiao Luo 2014-01-23 02:48:05 UTC 
Reproduce this issue on qemu-kvm-1.5.3-38.el7 and verify this issue on qemu-kvm-1.5.3-41.el7 with the instruction of comment #2.

###########Reproduced Steps and Results:
host info:
3.10.0-76.el7.x86_64
qemu-kvm-1.5.3-38.el7.x86_64
seabios-1.7.2.2-10.el7.x86_64
seabios-bin-1.7.2.2-10.el7.x86_64
guest info:
3.10.0-76.el7.x86_64

host ]# modprobe scsi_debug lbpu=1 lbpws=1 lbprz=0
host ]# lsscsi
[0:0:0:0]    disk    ATA      ST3500413AS      HP64  /dev/sda 
[2:0:0:0]    cd/dvd  hp       DVD-RAM GH80N    RF01  /dev/sr0 
[34:0:0:0]   disk    Linux    scsi_debug       0004  /dev/sdb

qemu-kvm command line: #/usr/libexec/qemu-kvm...-drive file=/dev/sdb,if=none,id=drive-data-disk,format=raw,cache=none,aio=native,werror=stop,rerror=stop,discard=on -device virtio-scsi-pci,id=scsi1,bus=pcie.0,addr=0x7 -device scsi-hd,drive=drive-data-disk,id=data-disk,bus=scsi1.0

guest ]# lsscsi
[6:0:0:0]    disk    QEMU     QEMU HARDDISK    1.5.  /dev/sda 
[7:0:0:0]    disk    QEMU     QEMU HARDDISK    1.5.  /dev/sdb 
guest ]# cat /sys/bus/scsi/devices/target7\:0\:0/7\:0\:0\:0/scsi_disk/7\:0\:0\:0/provisioning_mode
writesame_16               <-----------------------

###########Verified Steps and Results:
host info:
3.10.0-76.el7.x86_64
qemu-kvm-1.5.3-41.el7.x86_64
seabios-1.7.2.2-10.el7.x86_64
seabios-bin-1.7.2.2-10.el7.x86_64
guest info:
3.10.0-76.el7.x86_64

host ]# modprobe scsi_debug lbpu=1 lbpws=1 lbprz=0
host ]# lsscsi
[0:0:0:0]    disk    ATA      ST3500413AS      HP64  /dev/sda 
[2:0:0:0]    cd/dvd  hp       DVD-RAM GH80N    RF01  /dev/sr0 
[34:0:0:0]   disk    Linux    scsi_debug       0004  /dev/sdb

qemu-kvm command line: #/usr/libexec/qemu-kvm...-drive file=/dev/sdb,if=none,id=drive-data-disk,format=raw,cache=none,aio=native,werror=stop,rerror=stop,discard=on -device virtio-scsi-pci,id=scsi1,bus=pcie.0,addr=0x7 -device scsi-hd,drive=drive-data-disk,id=data-disk,bus=scsi1.0

guest ]# lsscsi
[6:0:0:0]    disk    QEMU     QEMU HARDDISK    1.5.  /dev/sda 
[7:0:0:0]    disk    QEMU     QEMU HARDDISK    1.5.  /dev/sdb 
guest ]# cat /sys/bus/scsi/devices/target7\:0\:0/7\:0\:0\:0/scsi_disk/7\:0\:0\:0/provisioning_mode
unmap                      <-----------------------

Base on above, this issue has been fixed correctly.

Best Regards,
sluo
Comment 7 Ludek Smid 2014-06-13 11:21:41 UTC 
This request was resolved in Red Hat Enterprise Linux 7.0.

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