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[libvirt] [PATCH v2] storage: add wipeVol to iscsi-direct storage backend



From: Clementine Hayat <clem lse epita fr>

Change set volume capacity to get volume capacity and put the connection
and helpers in one function to avoid code duplicates.

Signed-off-by: Clementine Hayat <clem lse epita fr>
---

Set BLOCK_PER_PACKET to 128. Not sure about this value. Should be
potentially tuned.

 src/storage/storage_backend_iscsi_direct.c | 173 ++++++++++++++++++---
 1 file changed, 152 insertions(+), 21 deletions(-)

diff --git a/src/storage/storage_backend_iscsi_direct.c b/src/storage/storage_backend_iscsi_direct.c
index 0764356b62..958f5937f9 100644
--- a/src/storage/storage_backend_iscsi_direct.c
+++ b/src/storage/storage_backend_iscsi_direct.c
@@ -41,6 +41,8 @@
 
 #define ISCSI_DEFAULT_TARGET_PORT 3260
 #define VIR_ISCSI_TEST_UNIT_TIMEOUT 30 * 1000
+#define BLOCK_PER_PACKET 128
+#define VOL_NAME_PREFIX "unit:0:0:"
 
 VIR_LOG_INIT("storage.storage_backend_iscsi_direct");
 
@@ -225,7 +227,7 @@ virISCSIDirectSetVolumeAttributes(virStoragePoolObjPtr pool,
 {
     virStoragePoolDefPtr def = virStoragePoolObjGetDef(pool);
 
-    if (virAsprintf(&vol->name, "unit:0:0:%u", lun) < 0)
+    if (virAsprintf(&vol->name, "%s%u", VOL_NAME_PREFIX, lun) < 0)
         return -1;
     if (virAsprintf(&vol->key, "ip-%s-iscsi-%s-lun-%u", portal,
                     def->source.devices[0].path, lun) < 0)
@@ -237,13 +239,13 @@ virISCSIDirectSetVolumeAttributes(virStoragePoolObjPtr pool,
 }
 
 static int
-virISCSIDirectSetVolumeCapacity(struct iscsi_context *iscsi,
-                                virStorageVolDefPtr vol,
-                                int lun)
+virISCSIDirectGetVolumeCapacity(struct iscsi_context *iscsi,
+                                int lun,
+                                uint32_t *block_size,
+                                uint32_t *nb_block)
 {
     struct scsi_task *task = NULL;
     struct scsi_inquiry_standard *inq = NULL;
-    long long size = 0;
     int ret = -1;
 
     if (!(task = iscsi_inquiry_sync(iscsi, lun, 0, 0, 64)) ||
@@ -282,10 +284,8 @@ virISCSIDirectSetVolumeCapacity(struct iscsi_context *iscsi,
             goto cleanup;
         }
 
-        size  = rc10->block_size;
-        size *= rc10->lba;
-        vol->target.capacity = size;
-        vol->target.allocation = size;
+        *block_size  = rc10->block_size;
+        *nb_block = rc10->lba;
 
     }
 
@@ -303,6 +303,8 @@ virISCSIDirectRefreshVol(virStoragePoolObjPtr pool,
 {
     virStoragePoolDefPtr def = virStoragePoolObjGetDef(pool);
     virStorageVolDefPtr vol = NULL;
+    uint32_t block_size;
+    uint32_t nb_block;
     int ret = -1;
 
     virStoragePoolObjClearVols(pool);
@@ -314,9 +316,12 @@ virISCSIDirectRefreshVol(virStoragePoolObjPtr pool,
 
     vol->type = VIR_STORAGE_VOL_NETWORK;
 
-    if (virISCSIDirectSetVolumeCapacity(iscsi, vol, lun) < 0)
+    if (virISCSIDirectGetVolumeCapacity(iscsi, lun,
+                                        &block_size, &nb_block) < 0)
         goto cleanup;
 
+    vol->target.capacity = block_size * nb_block;
+    vol->target.allocation = block_size * nb_block;
     def->capacity += vol->target.capacity;
     def->allocation += vol->target.allocation;
 
@@ -553,24 +558,33 @@ virStorageBackendISCSIDirectFindPoolSources(const char *srcSpec,
     virStoragePoolSourceFree(source);
     return ret;
 }
+static int
+virStorageBackendISCSIDirectSetConnection(virStoragePoolObjPtr pool,
+                                          struct iscsi_context **iscsi,
+                                          char **portal)
+{
+    virStoragePoolDefPtr def = virStoragePoolObjGetDef(pool);
+
+    if (!(*iscsi = virISCSIDirectCreateContext(def->source.initiator.iqn)))
+        return -1;
+    if (!(*portal = virStorageBackendISCSIDirectPortal(&def->source)))
+        return -1;
+    if (virStorageBackendISCSIDirectSetAuth(*iscsi, &def->source) < 0)
+        return -1;
+    if (virISCSIDirectSetContext(*iscsi, def->source.devices[0].path, ISCSI_SESSION_NORMAL) < 0)
+        return -1;
+    if (virISCSIDirectConnect(*iscsi, *portal) < 0)
+        return -1;
+    return 0;
+}
 
 static int
 virStorageBackendISCSIDirectRefreshPool(virStoragePoolObjPtr pool)
 {
-    virStoragePoolDefPtr def = virStoragePoolObjGetDef(pool);
     struct iscsi_context *iscsi = NULL;
     char *portal = NULL;
     int ret = -1;
-
-    if (!(iscsi = virISCSIDirectCreateContext(def->source.initiator.iqn)))
-        goto cleanup;
-    if (!(portal = virStorageBackendISCSIDirectPortal(&def->source)))
-        goto cleanup;
-    if (virStorageBackendISCSIDirectSetAuth(iscsi, &def->source) < 0)
-        goto cleanup;
-    if (virISCSIDirectSetContext(iscsi, def->source.devices[0].path, ISCSI_SESSION_NORMAL) < 0)
-        goto cleanup;
-    if (virISCSIDirectConnect(iscsi, portal) < 0)
+    if (virStorageBackendISCSIDirectSetConnection(pool, &iscsi, &portal) <0)
         goto cleanup;
     if (virISCSIDirectReportLuns(pool, iscsi, portal) < 0)
         goto disconect;
@@ -584,12 +598,129 @@ virStorageBackendISCSIDirectRefreshPool(virStoragePoolObjPtr pool)
     return ret;
 }
 
+static int
+virStorageBackendISCSIDirectGetLun(virStorageVolDefPtr vol,
+                                   int *lun)
+{
+    const char *name = vol->name;
+    int ret = -1;
+
+    if (!STRPREFIX(name, VOL_NAME_PREFIX)) {
+        virReportError(VIR_ERR_INTERNAL_ERROR,
+                       _("Invalid volume name %s"), name);
+        goto cleanup;
+    }
+
+    name += strlen(VOL_NAME_PREFIX);
+    if (virStrToLong_i(name, NULL, 10, lun) < 0)
+        goto cleanup;
+
+    ret = 0;
+ cleanup:
+    return ret;
+}
+
+static int
+virStorageBackendISCSIDirectVolWipeZero(virStorageVolDefPtr vol,
+                                        struct iscsi_context *iscsi)
+{
+    uint32_t lba = 0;
+    uint32_t block_size;
+    uint32_t nb_block;
+    struct scsi_task *task = NULL;
+    int lun = 0;
+    int ret = -1;
+    unsigned char *data;
+
+    if (virStorageBackendISCSIDirectGetLun(vol, &lun) < 0)
+        return ret;
+    if (virISCSIDirectTestUnitReady(iscsi, lun) < 0)
+        return ret;
+    if (virISCSIDirectGetVolumeCapacity(iscsi, lun, &block_size, &nb_block))
+        return ret;
+    if (VIR_ALLOC_N(data, block_size * BLOCK_PER_PACKET))
+        return ret;
+
+    while (lba < nb_block) {
+        if (nb_block - lba > block_size * BLOCK_PER_PACKET) {
+
+            if (!(task = iscsi_write10_sync(iscsi, lun, lba, data,
+                                            block_size * BLOCK_PER_PACKET,
+                                            block_size, 0, 0, 0, 0, 0)))
+                goto cleanup;
+            scsi_free_scsi_task(task);
+            lba += BLOCK_PER_PACKET;
+        } else {
+            if (!(task = iscsi_write10_sync(iscsi, lun, lba, data, block_size,
+                                        block_size, 0, 0, 0, 0, 0)))
+                goto cleanup;
+            scsi_free_scsi_task(task);
+            lba++;
+        }
+    }
+
+    ret = 0;
+ cleanup:
+    VIR_FREE(data);
+    return ret;
+}
+
+static int
+virStorageBackenISCSIDirectWipeVol(virStoragePoolObjPtr pool,
+                                   virStorageVolDefPtr vol,
+                                   unsigned int algorithm,
+                                   unsigned int flags)
+{
+    struct iscsi_context *iscsi = NULL;
+    char *portal = NULL;
+    int ret = -1;
+
+    virCheckFlags(0, -1);
+
+    if (virStorageBackendISCSIDirectSetConnection(pool, &iscsi, &portal) <0)
+        goto cleanup;
+
+    switch ((virStorageVolWipeAlgorithm) algorithm) {
+    case VIR_STORAGE_VOL_WIPE_ALG_ZERO:
+        if (virStorageBackendISCSIDirectVolWipeZero(vol, iscsi) < 0) {
+            virReportError(VIR_ERR_INTERNAL_ERROR,
+                                 _("failed to wipe volume %s"),
+                                 vol->name);
+            goto disconnect;
+        }
+            break;
+    case VIR_STORAGE_VOL_WIPE_ALG_TRIM:
+    case VIR_STORAGE_VOL_WIPE_ALG_NNSA:
+    case VIR_STORAGE_VOL_WIPE_ALG_DOD:
+    case VIR_STORAGE_VOL_WIPE_ALG_BSI:
+    case VIR_STORAGE_VOL_WIPE_ALG_GUTMANN:
+    case VIR_STORAGE_VOL_WIPE_ALG_SCHNEIER:
+    case VIR_STORAGE_VOL_WIPE_ALG_PFITZNER7:
+    case VIR_STORAGE_VOL_WIPE_ALG_PFITZNER33:
+    case VIR_STORAGE_VOL_WIPE_ALG_RANDOM:
+    case VIR_STORAGE_VOL_WIPE_ALG_LAST:
+        virReportError(VIR_ERR_INVALID_ARG, _("unsupported algorithm %d"),
+                       algorithm);
+        goto disconnect;
+    }
+
+    ret = 0;
+ disconnect:
+    virISCSIDirectDisconnect(iscsi);
+ cleanup:
+    VIR_FREE(portal);
+    iscsi_destroy_context(iscsi);
+    return ret;
+}
+
+
 virStorageBackend virStorageBackendISCSIDirect = {
     .type = VIR_STORAGE_POOL_ISCSI_DIRECT,
 
     .checkPool = virStorageBackendISCSIDirectCheckPool,
     .findPoolSources = virStorageBackendISCSIDirectFindPoolSources,
     .refreshPool = virStorageBackendISCSIDirectRefreshPool,
+    .wipeVol = virStorageBackenISCSIDirectWipeVol,
 };
 
 int
-- 
2.18.0


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