[PATCH RFC] allow to delete sheepdog snapshot

[Vasiliy Tolstov <v.tolstov@xxxxxxxxx>]

Signed-off-by: Vasiliy Tolstov <v.tolstov@xxxxxxxxx>
---
 block/sheepdog.c | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 57 insertions(+), 2 deletions(-)

diff --git a/block/sheepdog.c b/block/sheepdog.c
index d80e4ed..c3fae50 100644
--- a/block/sheepdog.c
+++ b/block/sheepdog.c
@@ -2484,8 +2484,63 @@ static int sd_snapshot_delete(BlockDriverState *bs,
                               const char *name,
                               Error **errp)
 {
-    /* FIXME: Delete specified snapshot id.  */
-    return 0;
+        uint32_t snap_id = 0;
+        uint32_t vdi = 0;
+        char snap_tag[SD_MAX_VDI_TAG_LEN];
+        Error *local_err = NULL;
+        int fd, ret;
+        char buf[SD_MAX_VDI_LEN + SD_MAX_VDI_TAG_LEN];
+        BDRVSheepdogState *s = bs->opaque;
+        unsigned int wlen = SD_MAX_VDI_LEN + SD_MAX_VDI_TAG_LEN, rlen = 0;
+
+        memset(buf, 0, sizeof(buf));
+        memset(snap_tag, 0, sizeof(snap_tag));
+        pstrcpy(buf, SD_MAX_VDI_LEN, s->name);
+        snap_id = strtoul(snapshot_id, NULL, 10);
+        if (!snap_id) {
+                pstrcpy(snap_tag, sizeof(snap_tag), snapshot_id);
+                pstrcpy(buf + SD_MAX_VDI_LEN, SD_MAX_VDI_TAG_LEN, snap_tag);
+        }
+
+        ret = find_vdi_name(s, s->name, snap_id, snap_tag, &vdi, true, &local_err);
+        if (ret) {
+                return ret;
+        }
+
+        SheepdogVdiReq hdr = {
+                .opcode = SD_OP_DEL_VDI,
+                .data_length = wlen,
+                .flags = SD_FLAG_CMD_WRITE,
+                .snapid = snap_id,
+        };
+        SheepdogVdiRsp *rsp = (SheepdogVdiRsp *)&hdr;
+
+        fd = connect_to_sdog(s, &local_err);
+        if (fd < 0) {
+                error_report_err(local_err);
+                return -1;
+        }
+
+        ret = do_req(fd, s->aio_context, (SheepdogReq *)&hdr,
+                     buf, &wlen, &rlen);
+        closesocket(fd);
+        if (ret) {
+                return ret;
+        }
+
+        switch (rsp->result) {
+        case SD_RES_NO_VDI:
+                error_report("%s was already deleted", s->name);
+        case SD_RES_SUCCESS:
+                break;
+        default:
+                error_report("%s, %s", sd_strerror(rsp->result), s->name);
+                return -1;
+        }
+
+//        ret = reload_inode(s, snap_id, snap_tag);
+
+        return ret;
 }

 static int sd_snapshot_list(BlockDriverState *bs, QEMUSnapshotInfo **psn_tab)
--
2.5.0

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