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2014-07-09Tools: hv: fix file overwriting of hv_fcopy_daemonYue Zhang1-1/+2
hv_fcopy_daemon fails to overwrite a file if the target file already exits. Add O_TRUNC flag on opening. Signed-off-by: Yue Zhang <yuezha@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-04-16Tools: hv: Handle the case when the target file exists correctlyK. Y. Srinivasan1-1/+3
Return the appropriate error code and handle the case when the target file exists correctly. This fixes a bug. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Cc: <stable@vger.kernel.org> [3.14] Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-02-18Drivers: hv: Implement the file copy serviceK. Y. Srinivasan1-0/+195
Implement the file copy service for Linux guests on Hyper-V. This permits the host to copy a file (over VMBUS) into the guest. This facility is part of "guest integration services" supported on the Windows platform. Here is a link that provides additional details on this functionality: http://technet.microsoft.com/en-us/library/dn464282.aspx In V1 version of the patch I have addressed comments from Olaf Hering <olaf@aepfle.de> and Dan Carpenter <dan.carpenter@oracle.com> In V2 version of this patch I did some minor cleanup (making some globals static). In V4 version of the patch I have addressed all of Olaf's most recent set of comments/concerns. In V5 version of the patch I had addressed Greg's most recent comments. I would like to thank Greg for suggesting that I use misc device; it has significantly simplified the code. In V6 version of the patch I have cleaned up error message based on Olaf's comments. I have also rebased the patch based on the current tip. In this version of the patch, I have addressed the latest comments from Greg. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-02-15Tools: hv: vssdaemon: Ignore VFAT mounts during the Freeze operationK. Y. Srinivasan1-0/+2
If the guest has a FAT file system mounted, skip it during the FREEZE operation. With this change we can support host initiated backup of the guest even when the guest may have FAT file systems mounted. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-02-15Adding makefile for tools/hvBjarke Istrup Pedersen1-0/+13
Currently, there is no makefile for the Hyper-V tools. This patch adds the missing makefile, and adds it to the main tools makefile. Signed-off-by: Bjarke Istrup Pedersen <gurligebis@gentoo.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-12-08Tools: hv: remove inclusion of linux/types.hOlaf Hering2-2/+0
With very old libc headers the inclusion of sys/types.h causes conflicts with linux/types.h. Since the latter is not required anyway, remove it from the source files. If any of the headers really needs linux/types.h it has to include it itself. Signed-off-by: Olaf Hering <olaf@aepfle.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-09-26Tools: hv: use single send+recv bufferOlaf Hering2-11/+7
send_buffer is used only once during registration. To reduce runtime memory usage reuse the recv_buffer for registration. Also use NLMSG_LENGTH instead of NLMSG_HDRLEN to take alignment into account. Signed-off-by: Olaf Hering <olaf@aepfle.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-09-26Tools: hv: cache FQDN in kvp_daemon to avoid timeoutsOlaf Hering1-7/+12
kvp_daemon does some operations which take an unpredicable amount of time. In addition the kernel driver gives the kvp_daemon a 5 second timeout to respond to message from the host. If an operation such as getaddrinfo takes a long time and the timeout triggers then netlink errors occour. As a result of such errors the daemon just terminates and the service becomes unavailable. Idendifying and fixing these shortcomings in the kernel-userland communication protocol will be done in separate patches. This change fixes just one obvious timeout bug. Update kvp_get_domain_name to not return a value, better diagnostic for the consumer of the hostname string, remove trailing newline in error case, use snprintf to not overrun output buffer, get hostname only once and return the cached result. Signed-off-by: Olaf Hering <olaf@aepfle.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-08-12Tools: hv: use full nlmsghdr in netlink_sendOlaf Hering2-20/+10
There is no need to have a nlmsghdr pointer to another temporary buffer. Instead use a full struct nlmsghdr. Signed-off-by: Olaf Hering <olaf@aepfle.de> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-08-12Tools: hv: correct payload size in netlink_sendOlaf Hering2-2/+2
netlink_send is supposed to send just the cn_msg+hv_kvp_msg via netlink. Currently it sets an incorrect iovec size, as reported by valgrind. In the case of registering with the kernel the allocated buffer is large enough to hold nlmsghdr+cn_msg+hv_kvp_msg, no overrun happens. In the case of responding to the kernel the cn_msg is located in the middle of recv_buffer, after the nlmsghdr. Currently the code in netlink_send adds also the size of nlmsghdr to the payload. But nlmsghdr is a separate iovec. This leads to an (harmless) out-of-bounds access when the kernel processes the iovec. Correct the iovec size of the cn_msg to be just cn_msg + its payload. Signed-off-by: Olaf Hering <olaf@aepfle.de> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-08-05Tools: hv: check return value of system in hv_kvp_daemonOlaf Hering1-1/+5
hv_kvp_daemon.c: In function 'main': hv_kvp_daemon.c:1441:8: warning: ignoring return value of 'daemon', declared with attribute warn_unused_result [-Wunused-result] Signed-off-by: Olaf Hering <olaf@aepfle.de> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-08-05Tools: hv: in kvp_set_ip_info free mac_addr right after usageOlaf Hering1-2/+1
... to simplify error path in upcoming changes. Signed-off-by: Olaf Hering <olaf@aepfle.de> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-08-02Tools: hv: check return value of daemon to fix compiler warning.Olaf Hering1-1/+2
hv_kvp_daemon.c: In function 'main': hv_kvp_daemon.c:1441:8: warning: ignoring return value of 'daemon', declared with attribute warn_unused_result [-Wunused-result] Signed-off-by: Olaf Hering <olaf@aepfle.de> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-08-02Tools: hv: fix send/recv buffer allocationOlaf Hering2-6/+24
hv_kvp_daemon fails to start in current openSuSE 13.1 snapshots because the kvp_send_buffer is too small to hold cn_msg+hv_kvp_msg, the very first sendmsg returns with EFAULT. In addition it fixes the Network info tab in Windows Server 2012R2 in SLES11. Adjust the code in kvp and vss daemon to allocate the needed buffers at runtime. To keep the code simple, the buffer_len includes also the nlmsghdr, although only the recv_buffer needs this extra space. Signed-off-by: Olaf Hering <olaf@aepfle.de> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-07-29Merge 3.11-rc3 into char-misc-next.Greg Kroah-Hartman1-2/+3
This resolves a merge issue with: drivers/misc/mei/init.c Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-07-26tools: hv: Check return value of setsockopt callTomas Hozza1-1/+5
Check return value of setsockopt call and if it fails print error to the system log and exit with non-zero value. Signed-off-by: Tomas Hozza <thozza@redhat.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-07-26tools: hv: Check return value of poll callTomas Hozza1-1/+10
Check return value of poll call and if it fails print error to the system log. If errno is EINVAL then exit with non-zero value otherwise continue the while loop and call poll again. Signed-off-by: Tomas Hozza <thozza@redhat.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-07-26tools: hv: Improve error logging in VSS daemon.Tomas Hozza1-4/+6
Use errno and strerror() when logging errors to provide more information. Signed-off-by: Tomas Hozza <thozza@redhat.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-07-16Tools: hv: KVP: Fix a bug in IPV6 subnet enumerationK. Y. Srinivasan1-2/+3
Each subnet string needs to be separated with a semicolon. Fix this bug. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Cc: Stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-06-17tools: hv: Improve error logging in KVP daemon.Tomas Hozza1-11/+18
Use errno and strerror() when logging errors to provide more information. Signed-off-by: Tomas Hozza <thozza@redhat.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-06-03tools: hv: Fix file descriptor leaksTomas Hozza1-1/+5
Close "fd" file descriptor when is goes out of scope so it does not leak. Signed-off-by: Tomas Hozza <thozza@redhat.com> Acked-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-06-03tools: hv: Check retrun value of strchr callTomas Hozza1-1/+3
Check return value of strchr call and dereference it only if it is not NULL. Signed-off-by: Tomas Hozza <thozza@redhat.com> Acked-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-06-03tools: hv: Check return value of poll callTomas Hozza1-1/+10
Check return value of poll call and if it fails print error to the system log. If errno is EINVAL then exit with non-zero value otherwise continue the while loop and call poll again. Signed-off-by: Tomas Hozza <thozza@redhat.com> Acked-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-06-03tools: hv: Check return value of setsockopt callTomas Hozza1-1/+7
Check return value of setsockopt call and if it fails print error to the system log and exit with non-zero value. Signed-off-by: Tomas Hozza <thozza@redhat.com> Acked-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-04-24Tools: hv: Fix a checkpatch warningK. Y. Srinivasan1-1/+1
Fix a checkpatch warning. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-04-24tools: hv: skip iso9660 mounts in hv_vss_daemonOlaf Hering1-0/+2
fsreeze does not work for iso9660 filesystems. A ENOSUPP may be caught in the freeze case, but the subsequent thaw call would fail and leads to a false error. Signed-off-by: Olaf Hering <olaf@aepfle.de> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-04-24tools: hv: use FIFREEZE/FITHAW in hv_vss_daemonOlaf Hering1-9/+22
As suggested by Paolo Bonzini, use ioctl instead of calling fsfreeze. Signed-off-by: Olaf Hering <olaf@aepfle.de> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-04-24tools: hv: use getmntent in hv_vss_daemonOlaf Hering1-18/+21
As suggested by Paolo Bonzini, use getmntent instead of parsing output of mount(1). Signed-off-by: Olaf Hering <olaf@aepfle.de> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-04-24Tools: hv: Fix a checkpatch warningK. Y. Srinivasan1-2/+3
Fix a checkpatch warning. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-04-24tools: hv: fix checks for origin of netlink message in hv_vss_daemonOlaf Hering1-1/+7
Similar to what commit 95a69adab9acfc3981c504737a2b6578e4d846ef ("tools: hv: Netlink source address validation allows DoS") does in hv_kvp_daemon, improve checks for origin of netlink connector message. Signed-off-by: Olaf Hering <olaf@aepfle.de> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-04-24Tools: hv: fix warnings in hv_vss_daemonOlaf Hering1-4/+8
This change fixes a few compile errors: hv_vss_daemon.c:64:15: warning: unknown escape sequence '\/' hv_vss_daemon.c:64:15: warning: unknown escape sequence '\/' hv_vss_daemon.c: In function 'vss_operate': hv_vss_daemon.c:66: warning: 'return' with no value, in function returning non-void hv_vss_daemon.c: In function 'main': hv_vss_daemon.c:130: warning: ignoring return value of 'daemon', declared with attribute warn_unused_result hv_vss_daemon.c: In function 'vss_operate': hv_vss_daemon.c:47: warning: 'fs_op' may be used uninitialized in this function Signed-off-by: Olaf Hering <olaf@aepfle.de> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-03-15Drivers: hv: Add a new driver to support host initiated backupK. Y. Srinivasan1-0/+220
This driver supports host initiated backup of the guest. On Windows guests, the host can generate application consistent backups using the Windows VSS framework. On Linux, we ensure that the backup will be file system consistent. This driver allows the host to initiate a "Freeze" operation on all the mounted file systems in the guest. Once the mounted file systems in the guest are frozen, the host snapshots the guest's file systems. Once this is done, the guest's file systems are "thawed". This driver has a user-level component (daemon) that invokes the appropriate operation on all the mounted file systems in response to the requests from the host. The duration for which the guest is frozen is very short - a few seconds. During this interval, the diff disk is comitted. In this version of the patch I have addressed the feedback from Olaf Herring. Also, some of the connector related issues have been fixed. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Cc: Evgeniy Polyakov <zbr@ioremap.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-03-15tools: hv: daemon should check type of received Netlink msgTomas Hozza1-0/+4
HyperV KVP daemon should check nlmsg_type in received netlink message header. If message type is NLMSG_DONE daemon can proceed with processing otherwise it should wait for next message. Signed-off-by: Tomas Hozza <thozza@redhat.com> Acked-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-03-15tools: hv: daemon setsockopt should use options macrosTomas Hozza1-3/+7
HyperV daemon should use macros for option values when calling setsockopt. Using specific numeric values instead of macros is confusing. Signed-off-by: Tomas Hozza <thozza@redhat.com> Acked-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-03-15tools: hv: daemon should subscribe only to CN_KVP_IDX groupTomas Hozza1-2/+2
Previously HyperV daemon set sockaddr_nl.nl_groups to CN_KVP_IDX. Netlink documentation says: "nl_groups is a bit mask with every bit representing a netlink group number". Since CN_KVP_IDX value is "9" HyperV daemon was receiving Netlink messages also from group number "1" which is used by CGroup Rules Engine Daemon. This caused the daemon to segfault (at least on 2.6.32 kernel). HyperV daemon should set nl_groups to zero and specify multicast group CN_KVP_IDX only by using socket options. Signed-off-by: Tomas Hozza <thozza@redhat.com> Acked-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-18tools: hv: Use CLOEXEC when opening kvp_pool filesTomas Hozza1-4/+4
Use CLOEXEC flag when opening kvp_pool_x files to prevent file descriptor leakage. Not using it was causing a problem when SELinux was enabled. Signed-off-by: Tomas Hozza <thozza@redhat.com> Acked-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-17tools: hv: Fix how ifcfg-* file is createdTomas Hozza2-43/+38
Fix for the daemon code and for hv_set_ifconfig.sh script, so that the created ifcfg-* file is consistent with initscripts documentation. Signed-off-by: Tomas Hozza <thozza@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-17tools: hv: fix a typo in hv_set_ifconfig.shJason Wang1-1/+1
Signed-off-by: Jason Wang <jasowang@redhat.com> Acked-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-17tools/hv: Fix permissions of created directory and filesBen Hutchings1-2/+2
It's silly to create directories without execute permission, or to give permissions to 'other' but not the group-owner. Write the permissions in octal and 'ls -l' format since these are much easier to read than the named macros. Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: Tomas Hozza <thozza@redhat.com> Acked-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-17tools/hv: Fix /var subdirectoryTomas Hozza1-6/+6
Initial patch by Ben Hutchings <ben@decadent.org.uk> We will install this in /usr, so it must use /var/lib for its state. Only programs installed under /opt should use /var/opt. Signed-off-by: Tomas Hozza <thozza@redhat.com> Acked-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-11-15tools/hv: Fix string typesTomas Hozza1-5/+5
Initial patch by Ben Hutchings <ben@decadent.org.uk> Standard C strings are arrays of char, not __u8 (unsigned char). Declare variables and parameters accordingly, and add the necessary casts. Signed-off-by: Tomas Hozza <thozza@redhat.com> Acked-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-11-15tools: hv: Netlink source address validation allows DoSTomas Hozza1-1/+7
The source code without this patch caused hypervkvpd to exit when it processed a spoofed Netlink packet which has been sent from an untrusted local user. Now Netlink messages with a non-zero nl_pid source address are ignored and a warning is printed into the syslog. Signed-off-by: Tomas Hozza <thozza@redhat.com> Acked-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-10-30Tools: hv: Don't return loopback addressesK. Y. Srinivasan1-4/+9
Don't return loopback addresses and further don't terminate the IP address strings with a semicolon. This is the current behavior of Windows guests. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Reported-by: Claudio Latini <claudio.latini@live.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-10-30tools: hv: Return the full kernel versionK. Y. Srinivasan1-3/+6
Currently, we are returning the same string for both OSBuildNumber and OSVersion keys. Return the full uts string for the OSBuild key since Windows does not impose any restrictions on this. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Reported-by: Claudio Latini <claudio.latini@live.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-09-10tools/hv: Parse /etc/os-releaseBen Hutchings1-4/+55
There is a new convention, used by systemd and supported by most distributions, to put basic OS release information in /etc/os-release. Added some additional error checking on strdup() Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-09-10tools/hv: Check for read/write errorsBen Hutchings1-3/+19
hv_kvp_daemon currently does not check whether fread() or fwrite() succeed. Add the necessary checks. Also, remove the incorrect use of feof() before fread(). Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-09-10tools/hv: Fix exit() error codeBen Hutchings1-11/+11
Linux native exit codes are 8-bit unsigned values. exit(-1) results in an exit code of 255, which is usually reserved for shells reporting 'command not found'. Use the portable value EXIT_FAILURE. (Not that this matters much for a daemon.) Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-09-10tools/hv: Fix file handle leakBen Hutchings1-1/+2
Match up each fopen() with an fclose(). Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-09-10Tools: hv: Implement the KVP verb - KVP_OP_GET_IP_INFOK. Y. Srinivasan1-3/+90
Now implement the KVP verb - KVP_OP_GET_IP_INFO. This operation retrieves IP information for the specified interface. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-09-10Tools: hv: Rename the function kvp_get_ip_address()K. Y. Srinivasan1-3/+3
Rename the function kvp_get_ip_address() to better reflect the functionality being implemented. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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