[libvirt] [v2] storage: Do not use comma as seperator for lvs output
Osier Yang
jyang at redhat.com
Mon Oct 10 08:33:13 UTC 2011
于 2011年10月10日 12:28, Osier Yang 写道:
> * src/storage/storage_backend_logical.c:
>
> If a logical vol is created as striped. (e.g. --stripes 3),
> the "device" field of lvs output will have multiple fileds which are
> seperated by comma. Thus the RE we write in the codes will not
> work well anymore. E.g. (lvs output for a stripped vol, uses "#" as
> seperator here):
>
> test_stripes##fSLSZH-zAS2-yAIb-n4mV-Al9u-HA3V-oo9K1B#\
> /dev/sdc1(10240),/dev/sdd1(0)#42949672960#4194304
>
> The RE we use:
>
> const char *regexes[] = {
> "^\\s*(\\S+),(\\S*),(\\S+),(\\S+)\\((\\S+)\\),(\\S+),([0-9]+),?\\s*$"
> };
>
> Also the RE doesn't match the "devices" field of striped vol properly,
> it contains multiple "device path" and "offset".
>
> This patch mainly does:
> 1) Change the seperator into "#"
> 2) Change the RE for "devices" field from "(\\S+)\\((\\S+)\\)"
> into "(\\S+)".
> 3) Add two new options for lvs command, (segtype, stripes)
> 4) Extend the RE to match the value for the two new fields.
> 5) Parse the "devices" field seperately in virStorageBackendLogicalMakeVol,
> multiple "extents" info are generated if the vol is striped. The
> number of "extents" is equal to the stripes number of the striped vol.
>
> A incidental fix: (virStorageBackendLogicalMakeVol)
> Free "vol" if it's new created and there is error.
>
> Demo on striped vol with the patch applied:
>
> % virsh vol-dumpxml /dev/test_vg/vol_striped2
> <volume>
> <name>vol_striped2</name>
> <key>QuWqmn-kIkZ-IATt-67rc-OWEP-1PHX-Cl2ICs</key>
> <source>
> <device path='/dev/sda5'>
> <extent start='79691776' end='88080384'/>
> </device>
> <device path='/dev/sda6'>
> <extent start='62914560' end='71303168'/>
> </device>
> </source>
> <capacity>8388608</capacity>
> <allocation>8388608</allocation>
> <target>
> <path>/dev/test_vg/vol_striped2</path>
> <permissions>
> <mode>0660</mode>
> <owner>0</owner>
> <group>6</group>
> <label>system_u:object_r:fixed_disk_device_t:s0</label>
> </permissions>
> </target>
> </volume>
>
> RHBZ: https://bugzilla.redhat.com/show_bug.cgi?id=727474
>
> v1 - v2:
> v1 just simply changes the seperator into "#".
>
> ---
> src/storage/storage_backend_logical.c | 156 +++++++++++++++++++++++++--------
> 1 files changed, 121 insertions(+), 35 deletions(-)
>
> diff --git a/src/storage/storage_backend_logical.c b/src/storage/storage_backend_logical.c
> index 589f486..dda68fd 100644
> --- a/src/storage/storage_backend_logical.c
> +++ b/src/storage/storage_backend_logical.c
> @@ -62,13 +62,22 @@ virStorageBackendLogicalSetActive(virStoragePoolObjPtr pool,
> }
>
>
> +#define VIR_STORAGE_VOL_LOGICAL_SEGTYPE_STRIPED "striped"
> +
> static int
> virStorageBackendLogicalMakeVol(virStoragePoolObjPtr pool,
> char **const groups,
> void *data)
> {
> virStorageVolDefPtr vol = NULL;
> + bool is_new_vol = false;
> unsigned long long offset, size, length;
> + const char *regex_unit = "(\\S+)\\((\\S+)\\)";
> + char *regex = NULL;
> + regex_t *reg = NULL;
> + regmatch_t *vars = NULL;
> + char *p = NULL;
> + int i, err, nextents, nvars, ret = -1;
>
> /* See if we're only looking for a specific volume */
> if (data != NULL) {
> @@ -88,19 +97,18 @@ virStorageBackendLogicalMakeVol(virStoragePoolObjPtr pool,
> return -1;
> }
>
> + is_new_vol = true;
> vol->type = VIR_STORAGE_VOL_BLOCK;
>
> if ((vol->name = strdup(groups[0])) == NULL) {
> virReportOOMError();
> - virStorageVolDefFree(vol);
> - return -1;
> + goto cleanup;
> }
>
> if (VIR_REALLOC_N(pool->volumes.objs,
> pool->volumes.count + 1)) {
> virReportOOMError();
> - virStorageVolDefFree(vol);
> - return -1;
> + goto cleanup;
> }
> pool->volumes.objs[pool->volumes.count++] = vol;
> }
> @@ -109,8 +117,7 @@ virStorageBackendLogicalMakeVol(virStoragePoolObjPtr pool,
> if (virAsprintf(&vol->target.path, "%s/%s",
> pool->def->target.path, vol->name) < 0) {
> virReportOOMError();
> - virStorageVolDefFree(vol);
> - return -1;
> + goto cleanup;
> }
> }
>
> @@ -118,8 +125,7 @@ virStorageBackendLogicalMakeVol(virStoragePoolObjPtr pool,
> if (virAsprintf(&vol->backingStore.path, "%s/%s",
> pool->def->target.path, groups[1]) < 0) {
> virReportOOMError();
> - virStorageVolDefFree(vol);
> - return -1;
> + goto cleanup;
> }
>
> vol->backingStore.format = VIR_STORAGE_POOL_LOGICAL_LVM2;
> @@ -128,47 +134,127 @@ virStorageBackendLogicalMakeVol(virStoragePoolObjPtr pool,
> if (vol->key == NULL &&
> (vol->key = strdup(groups[2])) == NULL) {
> virReportOOMError();
> - return -1;
> + goto cleanup;
> }
>
> if (virStorageBackendUpdateVolInfo(vol, 1) < 0)
> - return -1;
> + goto cleanup;
>
> + nextents = 1;
> + if (STREQ(groups[4], VIR_STORAGE_VOL_LOGICAL_SEGTYPE_STRIPED)) {
> + if (virStrToLong_i(groups[5], NULL, 10, &nextents) < 0) {
> + virStorageReportError(VIR_ERR_INTERNAL_ERROR, "%s",
> + _("malformed volume extent stripes value"));
> + goto cleanup;
> + }
> + }
>
> /* Finally fill in extents information */
> if (VIR_REALLOC_N(vol->source.extents,
> - vol->source.nextent + 1) < 0) {
> + vol->source.nextent + nextents) < 0) {
> virReportOOMError();
> - return -1;
> + goto cleanup;
> }
>
> - if ((vol->source.extents[vol->source.nextent].path =
> - strdup(groups[3])) == NULL) {
> + if (virStrToLong_ull(groups[6], NULL, 10, &length) < 0) {
> + virStorageReportError(VIR_ERR_INTERNAL_ERROR,
> + "%s", _("malformed volume extent length value"));
> + goto cleanup;
> + }
> + if (virStrToLong_ull(groups[7], NULL, 10, &size) < 0) {
> + virStorageReportError(VIR_ERR_INTERNAL_ERROR,
> + "%s", _("malformed volume extent size value"));
> + goto cleanup;
> + }
> +
> + /* Now parse the "devices" feild seperately */
> + regex = strdup(regex_unit);
> +
> + for (i = 1; i < nextents; i++) {
> + if (VIR_REALLOC_N(regex, strlen(regex) + strlen(regex_unit) + 2) < 0) {
> + virReportOOMError();
> + goto cleanup;
> + }
> + /* "," is the seperator of "devices" field */
> + strcat(regex, ",");
> + strncat(regex, regex_unit, strlen(regex_unit));
> + }
> +
> + if (VIR_ALLOC(reg) < 0) {
> virReportOOMError();
> - return -1;
> + goto cleanup;
> }
>
> - if (virStrToLong_ull(groups[4], NULL, 10, &offset) < 0) {
> - virStorageReportError(VIR_ERR_INTERNAL_ERROR,
> - "%s", _("malformed volume extent offset value"));
> - return -1;
> + /* Each extent has a "path:offset" pair, and vars[0] will
> + * be the whole matched string.
> + */
> + nvars = (nextents * 2) + 1;
> + if (VIR_ALLOC_N(vars, nvars) < 0) {
> + virReportOOMError();
> + goto cleanup;
> }
> - if (virStrToLong_ull(groups[5], NULL, 10, &length) < 0) {
> +
> + err = regcomp(reg, regex, REG_EXTENDED);
> + if (err != 0) {
> + char error[100];
> + regerror(err, reg, error, sizeof(error));
> virStorageReportError(VIR_ERR_INTERNAL_ERROR,
> - "%s", _("malformed volume extent length value"));
> - return -1;
> + _("Failed to compile regex %s"),
> + error);
> + goto cleanup;
> }
> - if (virStrToLong_ull(groups[6], NULL, 10, &size) < 0) {
> - virStorageReportError(VIR_ERR_INTERNAL_ERROR,
> - "%s", _("malformed volume extent size value"));
> - return -1;
> +
> + if (regexec(reg, groups[3], nvars, vars, 0) != 0) {
> + virStorageReportError(VIR_ERR_INTERNAL_ERROR, "%s",
> + _("malformed volume extent devices value"));
> + goto cleanup;
> }
>
> - vol->source.extents[vol->source.nextent].start = offset * size;
> - vol->source.extents[vol->source.nextent].end = (offset * size) + length;
> - vol->source.nextent++;
> + p = groups[3];
>
> - return 0;
> + /* vars[0] is skipped */
> + for (i = 0; i < nextents; i++) {
> + int j, len;
> + const char *offset_str = NULL;
> +
> + j = (i * 2) + 1;
> + len = vars[j].rm_eo - vars[j].rm_so;
> + p[vars[j].rm_eo] = '\0';
> +
> + if ((vol->source.extents[vol->source.nextent].path =
> + strndup(p + vars[j].rm_so, len)) == NULL) {
> + virReportOOMError();
> + goto cleanup;
> + }
> +
> + len = vars[j + 1].rm_eo - vars[j + 1].rm_so;
> + if (!(offset_str = strndup(p + vars[j + 1].rm_so, len))) {
> + virReportOOMError();
> + goto cleanup;
> + }
> +
> + if (virStrToLong_ull(offset_str, NULL, 10, &offset) < 0) {
> + virStorageReportError(VIR_ERR_INTERNAL_ERROR, "%s",
> + _("malformed volume extent offset value"));
> + goto cleanup;
> + }
> +
> + VIR_FREE(offset_str);
> +
> + vol->source.extents[vol->source.nextent].start = offset * size;
> + vol->source.extents[vol->source.nextent].end = (offset * size) + length;
> + vol->source.nextent++;
> + }
> +
> + ret = 0;
> +
> +cleanup:
> + VIR_FREE(regex);
> + VIR_FREE(reg);
> + VIR_FREE(vars);
> + if (is_new_vol && (ret == -1))
> + virStorageVolDefFree(vol);
> + return ret;
> }
>
> static int
> @@ -193,15 +279,15 @@ virStorageBackendLogicalFindLVs(virStoragePoolObjPtr pool,
> * not a suitable separator (rhbz 470693).
> */
> const char *regexes[] = {
> - "^\\s*(\\S+),(\\S*),(\\S+),(\\S+)\\((\\S+)\\),(\\S+),([0-9]+),?\\s*$"
> + "^\\s*(\\S+)#(\\S*)#(\\S+)#(\\S+)#(\\S+)#([0-9]+)#(\\S+)#([0-9]+)#?\\s*$"
Realized I need to add comment here to tell why "#" is choosed.
> };
> int vars[] = {
> - 7
> + 8
> };
> const char *prog[] = {
> - LVS, "--separator", ",", "--noheadings", "--units", "b",
> + LVS, "--separator", "#", "--noheadings", "--units", "b",
> "--unbuffered", "--nosuffix", "--options",
> - "lv_name,origin,uuid,devices,seg_size,vg_extent_size",
> + "lv_name,origin,uuid,devices,segtype,stripes,seg_size,vg_extent_size",
> pool->def->source.name, NULL
> };
>
More information about the libvir-list
mailing list