[libvirt] [PATCH] LXC: Fix the output units of ram filesystem size
Ján Tomko
jtomko at redhat.com
Tue Oct 8 17:28:51 UTC 2013
Commit 76b644c added support for adding RAM filesystems to LXC
domains, with a syntax of:
<source usage='10' unit='MiB'/>
where default unit would be KiB per documentation, however the
XML parser treated sizes without units as bytes.
When formatting the XML, this was divided by 1024, but the KiB units
were put inside the 'units' attribute, as opposed to the 'unit'
attribute the parser looks for.
The code generating the mount options assumed the size in the domain
definition to be in KiB, despite it being parsed as B. This worked
as long as exaclty one re-format of the XML happened (for domains that
were just created).
Change the XML output to bytes and fix the documentation.
https://bugzilla.redhat.com/show_bug.cgi?id=1015689
---
docs/formatdomain.html.in | 5 ++--
src/conf/domain_conf.c | 4 ++--
src/lxc/lxc_container.c | 2 +-
tests/lxcxml2xmldata/lxc-filesystem-ram.xml | 33 ++++++++++++++++++++++++++
tests/lxcxml2xmloutdata/lxc-filesystem-ram.xml | 33 ++++++++++++++++++++++++++
tests/lxcxml2xmltest.c | 1 +
6 files changed, 73 insertions(+), 5 deletions(-)
create mode 100644 tests/lxcxml2xmldata/lxc-filesystem-ram.xml
create mode 100644 tests/lxcxml2xmloutdata/lxc-filesystem-ram.xml
diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 3689399..bfe0ae4 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -2213,7 +2213,8 @@
<dd>
An in-memory filesystem, using memory from the host OS.
The source element has a single attribute <code>usage</code>
- which gives the memory usage limit in kibibytes. Only used
+ which gives the memory usage limit in bytes, unless units
+ are specified by the attribute <code>unit</code>. Only used
by LXC driver.
<span class="since"> (since 0.9.13)</span></dd>
<dt><code>type='bind'</code></dt>
@@ -2279,7 +2280,7 @@
<code>name</code> attribute must be used with
<code>type='template'</code>, and the <code>dir</code> attribute must
be used with <code>type='mount'</code>. The <code>usage</code> attribute
- is used with <code>type='ram'</code> to set the memory limit in KB.
+ is used with <code>type='ram'</code> to set the memory limit in bytes.
</dd>
<dt><code>target</code></dt>
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 0d63845..2c67966 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -14764,8 +14764,8 @@ virDomainFSDefFormat(virBufferPtr buf,
break;
case VIR_DOMAIN_FS_TYPE_RAM:
- virBufferAsprintf(buf, " <source usage='%lld' units='KiB'/>\n",
- def->usage / 1024);
+ virBufferAsprintf(buf, " <source usage='%lld' unit='B'/>\n",
+ def->usage);
break;
}
diff --git a/src/lxc/lxc_container.c b/src/lxc/lxc_container.c
index b1f429c..7c722cc 100644
--- a/src/lxc/lxc_container.c
+++ b/src/lxc/lxc_container.c
@@ -1428,7 +1428,7 @@ static int lxcContainerMountFSTmpfs(virDomainFSDefPtr fs,
VIR_DEBUG("usage=%lld sec=%s", fs->usage, sec_mount_options);
if (virAsprintf(&data,
- "size=%lldk%s", fs->usage, sec_mount_options) < 0)
+ "size=%lld%s", fs->usage, sec_mount_options) < 0)
goto cleanup;
if (virFileMakePath(fs->dst) < 0) {
diff --git a/tests/lxcxml2xmldata/lxc-filesystem-ram.xml b/tests/lxcxml2xmldata/lxc-filesystem-ram.xml
new file mode 100644
index 0000000..404429b
--- /dev/null
+++ b/tests/lxcxml2xmldata/lxc-filesystem-ram.xml
@@ -0,0 +1,33 @@
+<domain type='lxc'>
+ <name>demo</name>
+ <uuid>8369f1ac-7e46-e869-4ca5-759d51478066</uuid>
+ <memory unit='KiB'>500000</memory>
+ <currentMemory unit='KiB'>500000</currentMemory>
+ <vcpu placement='static'>1</vcpu>
+ <os>
+ <type arch='x86_64'>exe</type>
+ <init>/bin/sh</init>
+ </os>
+ <clock offset='utc'/>
+ <on_poweroff>destroy</on_poweroff>
+ <on_reboot>restart</on_reboot>
+ <on_crash>destroy</on_crash>
+ <devices>
+ <emulator>/usr/libexec/libvirt_lxc</emulator>
+ <filesystem type='ram'>
+ <source usage='1048576'/>
+ <target dir='/mnt/mississippi'/>
+ </filesystem>
+ <filesystem type='ram'>
+ <source usage='1048576' unit='b'/>
+ <target dir='/mnt/titicaca'/>
+ </filesystem>
+ <filesystem type='ram'>
+ <source usage='1024' unit='KiB'/>
+ <target dir='/mnt/orinoco'/>
+ </filesystem>
+ <console type='pty'>
+ <target type='lxc' port='0'/>
+ </console>
+ </devices>
+</domain>
diff --git a/tests/lxcxml2xmloutdata/lxc-filesystem-ram.xml b/tests/lxcxml2xmloutdata/lxc-filesystem-ram.xml
new file mode 100644
index 0000000..431b8cb
--- /dev/null
+++ b/tests/lxcxml2xmloutdata/lxc-filesystem-ram.xml
@@ -0,0 +1,33 @@
+<domain type='lxc'>
+ <name>demo</name>
+ <uuid>8369f1ac-7e46-e869-4ca5-759d51478066</uuid>
+ <memory unit='KiB'>500000</memory>
+ <currentMemory unit='KiB'>500000</currentMemory>
+ <vcpu placement='static'>1</vcpu>
+ <os>
+ <type arch='x86_64'>exe</type>
+ <init>/bin/sh</init>
+ </os>
+ <clock offset='utc'/>
+ <on_poweroff>destroy</on_poweroff>
+ <on_reboot>restart</on_reboot>
+ <on_crash>destroy</on_crash>
+ <devices>
+ <emulator>/usr/libexec/libvirt_lxc</emulator>
+ <filesystem type='ram' accessmode='passthrough'>
+ <source usage='1048576' unit='B'/>
+ <target dir='/mnt/mississippi'/>
+ </filesystem>
+ <filesystem type='ram' accessmode='passthrough'>
+ <source usage='1048576' unit='B'/>
+ <target dir='/mnt/titicaca'/>
+ </filesystem>
+ <filesystem type='ram' accessmode='passthrough'>
+ <source usage='1048576' unit='B'/>
+ <target dir='/mnt/orinoco'/>
+ </filesystem>
+ <console type='pty'>
+ <target type='lxc' port='0'/>
+ </console>
+ </devices>
+</domain>
diff --git a/tests/lxcxml2xmltest.c b/tests/lxcxml2xmltest.c
index 5846ab0..1692e4b 100644
--- a/tests/lxcxml2xmltest.c
+++ b/tests/lxcxml2xmltest.c
@@ -136,6 +136,7 @@ mymain(void)
DO_TEST("systemd");
DO_TEST("hostdev");
DO_TEST("disk-formats");
+ DO_TEST_DIFFERENT("filesystem-ram");
virObjectUnref(caps);
virObjectUnref(xmlopt);
--
1.8.1.5
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