[libvirt] [PATCH v2 3/5] storage: conf: Don't set any default <mode> in the XML
John Ferlan
jferlan at redhat.com
Fri May 8 14:24:31 UTC 2015
On 05/05/2015 12:44 PM, Cole Robinson wrote:
> The XML parser sets a default <mode> if none is explicitly passed in.
> This is then used at pool/vol creation time, and unconditionally reported
> in the XML.
>
> The problem with this approach is that it's impossible for other code
> to determine if the user explicitly requested a storage mode. There
> are some cases where we want to make this distinction, but we currently
> can't.
>
> Handle <mode> parsing like we handle <owner>/<group>: if no value is
> passed in, set it to -1, and adjust the internal consumers to handle
> it.
> ---
> docs/schemas/storagecommon.rng | 8 +++--
> src/conf/storage_conf.c | 34 +++++++++-------------
> src/storage/storage_backend.c | 20 +++++++++----
> src/storage/storage_backend.h | 3 ++
> src/storage/storage_backend_fs.c | 9 ++++--
> src/storage/storage_backend_logical.c | 4 ++-
> tests/storagepoolxml2xmlout/pool-netfs-gluster.xml | 1 -
> tests/storagevolxml2xmlin/vol-file.xml | 4 +--
> tests/storagevolxml2xmlout/vol-gluster-dir.xml | 1 -
> tests/storagevolxml2xmlout/vol-sheepdog.xml | 1 -
> 10 files changed, 49 insertions(+), 36 deletions(-)
>
Similar to 2/5 a note about <mode> being optional.
And in fact <permissions> over is optional...
> diff --git a/docs/schemas/storagecommon.rng b/docs/schemas/storagecommon.rng
> index 6f7d369..7c04462 100644
> --- a/docs/schemas/storagecommon.rng
> +++ b/docs/schemas/storagecommon.rng
> @@ -98,9 +98,11 @@
> <optional>
> <element name='permissions'>
> <interleave>
> - <element name='mode'>
> - <ref name='octalMode'/>
> - </element>
> + <optional>
> + <element name='mode'>
> + <ref name='octalMode'/>
> + </element>
> + </optional>
> <optional>
> <element name='owner'>
> <choice>
> diff --git a/src/conf/storage_conf.c b/src/conf/storage_conf.c
> index 99962b7..dae8fc9 100644
> --- a/src/conf/storage_conf.c
> +++ b/src/conf/storage_conf.c
> @@ -50,9 +50,6 @@
>
> VIR_LOG_INIT("conf.storage_conf");
>
> -#define DEFAULT_POOL_PERM_MODE 0755
> -#define DEFAULT_VOL_PERM_MODE 0600
> -
> VIR_ENUM_IMPL(virStorageVol,
> VIR_STORAGE_VOL_LAST,
> "file", "block", "dir", "network", "netdir")
> @@ -718,8 +715,7 @@ virStoragePoolDefParseSourceString(const char *srcSpec,
> static int
> virStorageDefParsePerms(xmlXPathContextPtr ctxt,
> virStoragePermsPtr perms,
> - const char *permxpath,
> - int defaultmode)
> + const char *permxpath)
> {
> char *mode;
> long long val;
> @@ -730,7 +726,7 @@ virStorageDefParsePerms(xmlXPathContextPtr ctxt,
> node = virXPathNode(permxpath, ctxt);
> if (node == NULL) {
> /* Set default values if there is not <permissions> element */
> - perms->mode = defaultmode;
> + perms->mode = (mode_t) -1;
> perms->uid = (uid_t) -1;
> perms->gid = (gid_t) -1;
> perms->label = NULL;
> @@ -740,10 +736,7 @@ virStorageDefParsePerms(xmlXPathContextPtr ctxt,
> relnode = ctxt->node;
> ctxt->node = node;
>
> - mode = virXPathString("string(./mode)", ctxt);
> - if (!mode) {
> - perms->mode = defaultmode;
> - } else {
> + if ((mode = virXPathString("string(./mode)", ctxt))) {
> int tmp;
>
> if (virStrToLong_i(mode, NULL, 8, &tmp) < 0 || (tmp & ~0777)) {
> @@ -754,6 +747,8 @@ virStorageDefParsePerms(xmlXPathContextPtr ctxt,
> }
> perms->mode = tmp;
> VIR_FREE(mode);
> + } else {
> + perms->mode = (mode_t) -1;
> }
>
> if (virXPathNode("./owner", ctxt) == NULL) {
> @@ -949,8 +944,7 @@ virStoragePoolDefParseXML(xmlXPathContextPtr ctxt)
> goto error;
>
> if (virStorageDefParsePerms(ctxt, &ret->target.perms,
> - "./target/permissions",
> - DEFAULT_POOL_PERM_MODE) < 0)
> + "./target/permissions") < 0)
> goto error;
> }
>
> @@ -1187,8 +1181,9 @@ virStoragePoolDefFormatBuf(virBufferPtr buf,
>
I think right about here there needs to be some logic added to avoid
printing (since it's optional anyway):
<permissions>
</permissions>
in the output XML
> virBufferAddLit(buf, "<permissions>\n");
> virBufferAdjustIndent(buf, 2);
> - virBufferAsprintf(buf, "<mode>0%o</mode>\n",
> - def->target.perms.mode);
> + if (def->target.perms.mode != (mode_t) -1)
> + virBufferAsprintf(buf, "<mode>0%o</mode>\n",
> + def->target.perms.mode);
> if (def->target.perms.uid != (uid_t) -1)
> virBufferAsprintf(buf, "<owner>%d</owner>\n",
> (int) def->target.perms.uid);
BUT be careful to not lose the </target> printing...
> @@ -1319,8 +1314,7 @@ virStorageVolDefParseXML(virStoragePoolDefPtr pool,
> if (VIR_ALLOC(ret->target.backingStore->perms) < 0)
> goto error;
> if (virStorageDefParsePerms(ctxt, ret->target.backingStore->perms,
> - "./backingStore/permissions",
> - DEFAULT_VOL_PERM_MODE) < 0)
> + "./backingStore/permissions") < 0)
> goto error;
> }
>
> @@ -1365,8 +1359,7 @@ virStorageVolDefParseXML(virStoragePoolDefPtr pool,
> if (VIR_ALLOC(ret->target.perms) < 0)
> goto error;
> if (virStorageDefParsePerms(ctxt, ret->target.perms,
> - "./target/permissions",
> - DEFAULT_VOL_PERM_MODE) < 0)
> + "./target/permissions") < 0)
> goto error;
>
> node = virXPathNode("./target/encryption", ctxt);
> @@ -1524,8 +1517,9 @@ virStorageVolTargetDefFormat(virStorageVolOptionsPtr options,
Likewise, I think right about here as a condition to this block we need
a way to avoid printing (since it's optional anyway):
<permissions>
</permissions>
in the output XML
> virBufferAddLit(buf, "<permissions>\n");
> virBufferAdjustIndent(buf, 2);
>
> - virBufferAsprintf(buf, "<mode>0%o</mode>\n",
> - def->perms->mode);
> + if (def->perms->mode != (mode_t) -1)
> + virBufferAsprintf(buf, "<mode>0%o</mode>\n",
> + def->perms->mode);
> if (def->perms->uid != (uid_t) -1)
> virBufferAsprintf(buf, "<owner>%d</owner>\n",
> (int) def->perms->uid);
> diff --git a/src/storage/storage_backend.c b/src/storage/storage_backend.c
> index 289f454..ce59f63 100644
> --- a/src/storage/storage_backend.c
> +++ b/src/storage/storage_backend.c
> @@ -318,6 +318,7 @@ virStorageBackendCreateBlockFrom(virConnectPtr conn ATTRIBUTE_UNUSED,
> struct stat st;
> gid_t gid;
> uid_t uid;
> + mode_t mode;
> bool reflink_copy = false;
>
> virCheckFlags(VIR_STORAGE_VOL_CREATE_PREALLOC_METADATA |
> @@ -367,10 +368,13 @@ virStorageBackendCreateBlockFrom(virConnectPtr conn ATTRIBUTE_UNUSED,
> (unsigned int) gid);
> goto cleanup;
> }
> - if (fchmod(fd, vol->target.perms->mode) < 0) {
> +
> + mode = (vol->target.perms->mode == (mode_t) -1 ?
> + VIR_STORAGE_DEFAULT_VOL_PERM_MODE : vol->target.perms->mode);
> + if (fchmod(fd, mode) < 0) {
> virReportSystemError(errno,
> _("cannot set mode of '%s' to %04o"),
> - vol->target.path, vol->target.perms->mode);
> + vol->target.path, mode);
> goto cleanup;
> }
> if (VIR_CLOSE(fd) < 0) {
> @@ -509,7 +513,9 @@ virStorageBackendCreateRaw(virConnectPtr conn ATTRIBUTE_UNUSED,
>
> if ((fd = virFileOpenAs(vol->target.path,
> O_RDWR | O_CREAT | O_EXCL,
> - vol->target.perms->mode,
> + (vol->target.perms->mode ?
> + VIR_STORAGE_DEFAULT_VOL_PERM_MODE :
> + vol->target.perms->mode),
> vol->target.perms->uid,
> vol->target.perms->gid,
> operation_flags)) < 0) {
> @@ -664,6 +670,7 @@ virStorageBackendCreateExecCommand(virStoragePoolObjPtr pool,
> struct stat st;
> gid_t gid;
> uid_t uid;
> + mode_t mode;
> bool filecreated = false;
>
> if ((pool->def->type == VIR_STORAGE_POOL_NETFS)
> @@ -709,10 +716,13 @@ virStorageBackendCreateExecCommand(virStoragePoolObjPtr pool,
> (unsigned int) gid);
> return -1;
> }
> - if (chmod(vol->target.path, vol->target.perms->mode) < 0) {
> +
> + mode = (vol->target.perms->mode == (mode_t) -1 ?
> + VIR_STORAGE_DEFAULT_VOL_PERM_MODE : vol->target.perms->mode);
> + if (chmod(vol->target.path, mode) < 0) {
> virReportSystemError(errno,
> _("cannot set mode of '%s' to %04o"),
> - vol->target.path, vol->target.perms->mode);
> + vol->target.path, mode);
> return -1;
> }
> return 0;
> diff --git a/src/storage/storage_backend.h b/src/storage/storage_backend.h
> index 85a8a4b..39c00b1 100644
> --- a/src/storage/storage_backend.h
> +++ b/src/storage/storage_backend.h
> @@ -177,6 +177,9 @@ int virStorageBackendVolOpen(const char *path, struct stat *sb,
> ATTRIBUTE_RETURN_CHECK
> ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2);
>
> +# define VIR_STORAGE_DEFAULT_POOL_PERM_MODE 0755
> +# define VIR_STORAGE_DEFAULT_VOL_PERM_MODE 0600
> +
> int virStorageBackendUpdateVolInfo(virStorageVolDefPtr vol,
> bool withBlockVolFormat,
> unsigned int openflags);
> diff --git a/src/storage/storage_backend_fs.c b/src/storage/storage_backend_fs.c
> index 9d84a38..62949ba 100644
> --- a/src/storage/storage_backend_fs.c
> +++ b/src/storage/storage_backend_fs.c
> @@ -801,7 +801,9 @@ virStorageBackendFileSystemBuild(virConnectPtr conn ATTRIBUTE_UNUSED,
> * requested in the config. If the dir already exists, just set
> * the perms. */
> if ((err = virDirCreate(pool->def->target.path,
> - pool->def->target.perms.mode,
> + (pool->def->target.perms.mode == (mode_t) -1 ?
> + VIR_STORAGE_DEFAULT_POOL_PERM_MODE :
> + pool->def->target.perms.mode),
> pool->def->target.perms.uid,
> pool->def->target.perms.gid,
> VIR_DIR_CREATE_FORCE_PERMS |
> @@ -1072,7 +1074,10 @@ static int createFileDir(virConnectPtr conn ATTRIBUTE_UNUSED,
> }
>
>
> - if ((err = virDirCreate(vol->target.path, vol->target.perms->mode,
> + if ((err = virDirCreate(vol->target.path,
> + (vol->target.perms->mode == (mode_t) -1 ?
> + VIR_STORAGE_DEFAULT_VOL_PERM_MODE :
> + vol->target.perms->mode),
> vol->target.perms->uid,
> vol->target.perms->gid,
> VIR_DIR_CREATE_FORCE_PERMS |
> diff --git a/src/storage/storage_backend_logical.c b/src/storage/storage_backend_logical.c
> index 11c5683..9c77b4c 100644
> --- a/src/storage/storage_backend_logical.c
> +++ b/src/storage/storage_backend_logical.c
> @@ -787,7 +787,9 @@ virStorageBackendLogicalCreateVol(virConnectPtr conn,
> goto error;
> }
> }
> - if (fchmod(fd, vol->target.perms->mode) < 0) {
> + if (fchmod(fd, (vol->target.perms->mode == (mode_t) -1 ?
> + VIR_STORAGE_DEFAULT_VOL_PERM_MODE :
> + vol->target.perms->mode)) < 0) {
> virReportSystemError(errno,
> _("cannot set file mode '%s'"),
> vol->target.path);
> diff --git a/tests/storagepoolxml2xmlout/pool-netfs-gluster.xml b/tests/storagepoolxml2xmlout/pool-netfs-gluster.xml
> index 90143f9..9e36cb6 100644
> --- a/tests/storagepoolxml2xmlout/pool-netfs-gluster.xml
> +++ b/tests/storagepoolxml2xmlout/pool-netfs-gluster.xml
> @@ -12,7 +12,6 @@
> <target>
> <path>/mnt/gluster</path>
> <permissions>
> - <mode>0755</mode>
> </permissions>
> </target>
> </pool>
> diff --git a/tests/storagevolxml2xmlin/vol-file.xml b/tests/storagevolxml2xmlin/vol-file.xml
> index d3f65f6..8bb9004 100644
> --- a/tests/storagevolxml2xmlin/vol-file.xml
> +++ b/tests/storagevolxml2xmlin/vol-file.xml
> @@ -6,8 +6,8 @@
> <target>
> <path>/var/lib/libvirt/images/sparse.img</path>
> <permissions>
> - <mode>0</mode>
> - <owner>0744</owner>
> + <mode>00</mode>
^^^
This one's really odd. Still scratching my head over why previously we
printed "<mode>0</mode>", but now we print "<mode>00</mode>"
> + <owner>744</owner>
> <group>0</group>
> <label>virt_image_t</label>
> </permissions>
> diff --git a/tests/storagevolxml2xmlout/vol-gluster-dir.xml b/tests/storagevolxml2xmlout/vol-gluster-dir.xml
> index 0af0be1..37400b9 100644
> --- a/tests/storagevolxml2xmlout/vol-gluster-dir.xml
> +++ b/tests/storagevolxml2xmlout/vol-gluster-dir.xml
> @@ -9,7 +9,6 @@
> <path>gluster://example.com/vol/dir</path>
> <format type='dir'/>
> <permissions>
> - <mode>0600</mode>
> </permissions>
This will need updating to remove the unnecessary
<permissions>
</permissions>
> </target>
> </volume>
> diff --git a/tests/storagevolxml2xmlout/vol-sheepdog.xml b/tests/storagevolxml2xmlout/vol-sheepdog.xml
> index d8f34d3..fe1879f 100644
> --- a/tests/storagevolxml2xmlout/vol-sheepdog.xml
> +++ b/tests/storagevolxml2xmlout/vol-sheepdog.xml
> @@ -8,7 +8,6 @@
> <path>sheepdog:test2</path>
> <format type='unknown'/>
> <permissions>
> - <mode>0600</mode>
> </permissions>
This will need updating too
ACK with the adjustments - any maybe you can chase why we get "00" now...
John
> </target>
> </volume>
>
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