Changeset 28ed0d9 in mainline for uspace/lib/c/generic/vbd.c

Timestamp:

2015-06-27T19:50:12Z (9 years ago)

Author:

Jiri Svoboda <jiri@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

78d50bd

Parents:

22fb7ab

Message:

VBD client API, liblabel API, pass partition creation/deletion through to VBD.

File:

• uspace/lib/c/generic/vbd.c (modified) (2 diffs)

uspace/lib/c/generic/vbd.c

@@ -37 +37 @@
 #include <ipc/vbd.h>
 #include <loc.h>
+#include <mem.h>
 #include <stdlib.h>
 #include <types/label.h>
@@ -153 +154 @@
 }
 
+/** Get list of IDs into a buffer of fixed size.
+ *
+ * @param vbd      Virtual Block Device
+ * @param method   IPC method
+ * @param arg1     First argument
+ * @param id_buf   Buffer to store IDs
+ * @param buf_size Buffer size
+ * @param act_size Place to store actual size of complete data.
+ *
+ * @return EOK on success or negative error code.
+ */
+static int vbd_get_ids_once(vbd_t *vbd, sysarg_t method, sysarg_t arg1,
+    sysarg_t *id_buf, size_t buf_size, size_t *act_size)
+{
+        async_exch_t *exch = async_exchange_begin(vbd->sess);
+
+        ipc_call_t answer;
+        aid_t req = async_send_1(exch, method, arg1, &answer);
+        int rc = async_data_read_start(exch, id_buf, buf_size);
+
+        async_exchange_end(exch);
+
+        if (rc != EOK) {
+                async_forget(req);
+                return rc;
+        }
+
+        sysarg_t retval;
+        async_wait_for(req, &retval);
+
+        if (retval != EOK) {
+                return retval;
+        }
+
+        *act_size = IPC_GET_ARG1(answer);
+        return EOK;
+}
+
+/** Get list of IDs.
+ *
+ * Returns an allocated array of service IDs.
+ *
+ * @param vbd    Virtual Block Device
+ * @param method IPC method
+ * @param arg1   IPC argument 1
+ * @param data   Place to store pointer to array of IDs
+ * @param count  Place to store number of IDs
+ * @return       EOK on success or negative error code
+ */
+static int vbd_get_ids_internal(vbd_t *vbd, sysarg_t method, sysarg_t arg1,
+    sysarg_t **data, size_t *count)
+{
+        *data = NULL;
+        *count = 0;
+
+        size_t act_size = 0;
+        int rc = vbd_get_ids_once(vbd, method, arg1, NULL, 0, &act_size);
+        if (rc != EOK)
+                return rc;
+
+        size_t alloc_size = act_size;
+        service_id_t *ids = malloc(alloc_size);
+        if (ids == NULL)
+                return ENOMEM;
+
+        while (true) {
+                rc = vbd_get_ids_once(vbd, method, arg1, ids, alloc_size,
+                    &act_size);
+                if (rc != EOK)
+                        return rc;
+
+                if (act_size <= alloc_size)
+                        break;
+
+                alloc_size = act_size;
+                ids = realloc(ids, alloc_size);
+                if (ids == NULL)
+                        return ENOMEM;
+        }
+
+        *count = act_size / sizeof(service_id_t);
+        *data = ids;
+        return EOK;
+}
+
+/** Get list of disks as array of service IDs.
+ *
+ * @param vbd   Virtual Block Device
+ * @param data  Place to store pointer to array
+ * @param count Place to store length of array (number of entries)
+ *
+ * @return EOK on success or negative error code
+ */
+int vbd_label_get_parts(vbd_t *vbd, service_id_t disk,
+    service_id_t **data, size_t *count)
+{
+        return vbd_get_ids_internal(vbd, VBD_LABEL_GET_PARTS, disk,
+            data, count);
+}
+
+int vbd_part_get_info(vbd_t *vbd, vbd_part_id_t part, vbd_part_info_t *pinfo)
+{
+        async_exch_t *exch;
+        int retval;
+
+        exch = async_exchange_begin(vbd->sess);
+        retval = async_req_1_0(exch, VBD_PART_GET_INFO, part);
+        async_exchange_end(exch);
+
+        if (retval != EOK)
+                return EIO;
+
+        return EOK;
+}
+
+int vbd_part_create(vbd_t *vbd, service_id_t disk, vbd_part_spec_t *pspec,
+    vbd_part_id_t *rpart)
+{
+        async_exch_t *exch;
+        sysarg_t part;
+        int retval;
+
+        exch = async_exchange_begin(vbd->sess);
+        retval = async_req_1_1(exch, VBD_PART_CREATE, disk, &part);
+        async_exchange_end(exch);
+
+        if (retval != EOK)
+                return EIO;
+
+        *rpart = (vbd_part_id_t)part;
+        return EOK;
+}
+
+int vbd_part_delete(vbd_t *vbd, vbd_part_id_t part)
+{
+        async_exch_t *exch;
+        int retval;
+
+        exch = async_exchange_begin(vbd->sess);
+        retval = async_req_1_0(exch, VBD_PART_DELETE, part);
+        async_exchange_end(exch);
+
+        if (retval != EOK)
+                return EIO;
+
+        return EOK;
+}
+
+void vbd_pspec_init(vbd_part_spec_t *pspec)
+{
+        memset(pspec, 0, sizeof(vbd_part_spec_t));
+}
+
 /** @}
  */