Note: This bug is displayed in read-only format because the product is no longer active in Red Hat Bugzilla.
RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.

Bug 1037503

Summary: fix thin provisioning support for block device backends
Product: Red Hat Enterprise Linux 7 Reporter: Paolo Bonzini <pbonzini>
Component: qemu-kvmAssignee: Paolo Bonzini <pbonzini>
Status: CLOSED CURRENTRELEASE QA Contact: Virtualization Bugs <virt-bugs>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 7.0CC: acathrow, areis, jcody, juzhang, knoel, mazhang, michen, pbonzini, sluo, virt-maint
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: qemu-kvm-1.5.3-41.el7 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
: 1055487 1103845 (view as bug list) Environment:
Last Closed: 2014-06-13 11:21:41 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 1055487, 1059976, 1136534    

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.

Contact your manager or support representative in case you have further questions about the request.