Split new NFS proxy implementation into multiple files

src/nfs_kv_read.cpp

@@ -0,0 +1,69 @@
+// Copyright (c) Vitaliy Filippov, 2019+
+// License: VNPL-1.1 (see README.md for details)
+//
+// NFS proxy over VitastorKV database - READ
+
+#include <sys/time.h>
+
+#include "str_util.h"
+
+#include "nfs_proxy.h"
+
+#include "nfs/nfs.h"
+
+#include "cli.h"
+
+int kv_nfs3_read_proc(void *opaque, rpc_op_t *rop)
+{
+    nfs_client_t *self = (nfs_client_t*)opaque;
+    READ3args *args = (READ3args*)rop->request;
+    READ3res *reply = (READ3res*)rop->reply;
+    inode_t ino = kv_fh_inode(args->file);
+    if (args->count > MAX_REQUEST_SIZE || !ino)
+    {
+        *reply = (READ3res){ .status = NFS3ERR_INVAL };
+        rpc_queue_reply(rop);
+        return 0;
+    }
+    uint64_t alignment = self->parent->cli->st_cli.global_bitmap_granularity;
+    auto pool_cfg = self->parent->cli->st_cli.pool_config.find(INODE_POOL(self->parent->fs_base_inode));
+    if (pool_cfg != self->parent->cli->st_cli.pool_config.end())
+    {
+        alignment = pool_cfg->second.bitmap_granularity;
+    }
+    uint64_t aligned_offset = args->offset - (args->offset % alignment);
+    uint64_t aligned_count = args->offset + args->count;
+    if (aligned_count % alignment)
+        aligned_count = aligned_count + alignment - (aligned_count % alignment);
+    aligned_count -= aligned_offset;
+    void *buf = malloc_or_die(aligned_count);
+    xdr_add_malloc(rop->xdrs, buf);
+    cluster_op_t *op = new cluster_op_t;
+    op->opcode = OSD_OP_READ;
+    op->inode = self->parent->fs_base_inode + ino;
+    op->offset = aligned_offset;
+    op->len = aligned_count;
+    op->iov.push_back(buf, aligned_count);
+    *reply = (READ3res){ .status = NFS3_OK };
+    reply->resok.data.data = (char*)buf + args->offset - aligned_offset;
+    reply->resok.data.size = args->count;
+    op->callback = [rop](cluster_op_t *op)
+    {
+        READ3res *reply = (READ3res*)rop->reply;
+        if (op->retval != op->len)
+        {
+            *reply = (READ3res){ .status = vitastor_nfs_map_err(-op->retval) };
+        }
+        else
+        {
+            auto & reply_ok = reply->resok;
+            // reply_ok.data.data is already set above
+            reply_ok.count = reply_ok.data.size;
+            reply_ok.eof = 0;
+        }
+        rpc_queue_reply(rop);
+        delete op;
+    };
+    self->parent->cli->execute(op);
+    return 1;
+}