WebSVN – HelenOS – Diff – /branches/dynload/uspace/lib/libfs/libfs.c

 /*
- * Copyright (c) 2008 Jakub Jermar
+ * Copyright (c) 2009 Jakub Jermar
  * All rights reserved.
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
 #include <async.h>
 #include <ipc/ipc.h>
 #include <as.h>
 #include <assert.h>
 #include <dirent.h>
+#include <mem.h>
+#include <sys/stat.h>
 /** Register file system server.
+ *
  * This function abstracts away the tedious registration protocol from
  * file system implementations and lets them to reuse this registration glue
      * Tell VFS that we are here and want to get registered.
      * We use the async framework because VFS will answer the request
      * out-of-order, when it knows that the operation succeeded or failed.
      */
     ipc_call_t answer;
-    aid_t req = async_send_0(vfs_phone, VFS_REGISTER, &answer);
+    aid_t req = async_send_0(vfs_phone, VFS_IN_REGISTER, &answer);
     /*
      * Send our VFS info structure to VFS.
      */
     int rc = ipc_data_write_start(vfs_phone, info, sizeof(*info));
         async_wait_for(req, NULL);
         return rc;
+    }
     /*
-     * Pick up the answer for the request to the VFS_REQUEST call.
+     * Pick up the answer for the request to the VFS_IN_REQUEST call.
      */
     async_wait_for(req, NULL);
     reg->fs_handle = (int) IPC_GET_ARG1(answer);
     /*
     async_set_client_connection(conn);
     return IPC_GET_RETVAL(answer);
+}
+void fs_node_initialize(fs_node_t *fn)
+{
+    memset(fn, 0, sizeof(fs_node_t));
+}
+void libfs_mount(libfs_ops_t *ops, fs_handle_t fs_handle, ipc_callid_t rid,
+    ipc_call_t *request)
+{
+    dev_handle_t mp_dev_handle = (dev_handle_t) IPC_GET_ARG1(*request);
+    fs_index_t mp_fs_index = (fs_index_t) IPC_GET_ARG2(*request);
+    fs_handle_t mr_fs_handle = (fs_handle_t) IPC_GET_ARG3(*request);
+    dev_handle_t mr_dev_handle = (dev_handle_t) IPC_GET_ARG4(*request);
+    int res;
+    ipcarg_t rc;
+    ipc_call_t call;
+    ipc_callid_t callid;
+    /* accept the phone */
+    callid = async_get_call(&call);
+    int mountee_phone = (int)IPC_GET_ARG1(call);
+    if ((IPC_GET_METHOD(call) != IPC_M_CONNECTION_CLONE) ||
+        mountee_phone < 0) {
+        ipc_answer_0(callid, EINVAL);
+        ipc_answer_0(rid, EINVAL);
+        return;
+    }
+    ipc_answer_0(callid, EOK);  /* acknowledge the mountee_phone */
+    res = ipc_data_write_receive(&callid, NULL);
+    if (!res) {
+        ipc_hangup(mountee_phone);
+        ipc_answer_0(callid, EINVAL);
+        ipc_answer_0(rid, EINVAL);
+        return;
+    }
+    fs_node_t *fn = ops->node_get(mp_dev_handle, mp_fs_index);
+    if (!fn) {
+        ipc_hangup(mountee_phone);
+        ipc_answer_0(callid, ENOENT);
+        ipc_answer_0(rid, ENOENT);
+        return;
+    }
+    if (fn->mp_data.mp_active) {
+        ipc_hangup(mountee_phone);
+        ops->node_put(fn);
+        ipc_answer_0(callid, EBUSY);
+        ipc_answer_0(rid, EBUSY);
+        return;
+    }
+    rc = async_req_0_0(mountee_phone, IPC_M_CONNECT_ME);
+    if (rc != 0) {
+        ipc_hangup(mountee_phone);
+        ops->node_put(fn);
+        ipc_answer_0(callid, rc);
+        ipc_answer_0(rid, rc);
+        return;
+    }
+    ipc_call_t answer;
+    aid_t msg = async_send_1(mountee_phone, VFS_OUT_MOUNTED, mr_dev_handle,
+        &answer);
+    ipc_forward_fast(callid, mountee_phone, 0, 0, 0, IPC_FF_ROUTE_FROM_ME);
+    async_wait_for(msg, &rc);
+    if (rc == EOK) {
+        fn->mp_data.mp_active = true;
+        fn->mp_data.fs_handle = mr_fs_handle;
+        fn->mp_data.dev_handle = mr_dev_handle;
+        fn->mp_data.phone = mountee_phone;
+    }
+    /*
+     * Do not release the FS node so that it stays in memory.
+     */
+    ipc_answer_3(rid, rc, IPC_GET_ARG1(answer), IPC_GET_ARG2(answer),
+        IPC_GET_ARG3(answer));
+}
 /** Lookup VFS triplet by name in the file system name space.
+ *
  * The path passed in the PLB must be in the canonical file system path format
  * as returned by the canonify() function.
+ *
  * @param ops       libfs operations structure with function pointers to
- *          file system implementation
+ *                  file system implementation
  * @param fs_handle File system handle of the file system where to perform
- *          the lookup.
+ *                  the lookup.
- * @param rid       Request ID of the VFS_LOOKUP request.
+ * @param rid       Request ID of the VFS_OUT_LOOKUP request.
- * @param request   VFS_LOOKUP request data itself.
+ * @param request   VFS_OUT_LOOKUP request data itself.
+ *
  */
 void libfs_lookup(libfs_ops_t *ops, fs_handle_t fs_handle, ipc_callid_t rid,
     ipc_call_t *request)
+{
-    unsigned next = IPC_GET_ARG1(*request);
+    unsigned first = IPC_GET_ARG1(*request);
     unsigned last = IPC_GET_ARG2(*request);
+    unsigned next = first;
     dev_handle_t dev_handle = IPC_GET_ARG3(*request);
     int lflag = IPC_GET_ARG4(*request);
     fs_index_t index = IPC_GET_ARG5(*request); /* when L_LINK specified */
     char component[NAME_MAX + 1];
     int len;
     fs_node_t *par = NULL;
     fs_node_t *cur = ops->root_get(dev_handle);
     fs_node_t *tmp = NULL;
+    if (cur->mp_data.mp_active) {
+        ipc_forward_slow(rid, cur->mp_data.phone, VFS_OUT_LOOKUP,
+            next, last, cur->mp_data.dev_handle, lflag, index,
+            IPC_FF_ROUTE_FROM_ME);
+        ops->node_put(cur);
+        return;
+    }
     if (ops->plb_get_char(next) == '/')
         next++;     /* eat slash */
     while (next <= last && ops->has_children(cur)) {
         /* collect the component */
         component[len] = '\0';
         next++;     /* eat slash */
         /* match the component */
         tmp = ops->match(cur, component);
+        if (tmp && tmp->mp_data.mp_active) {
+            if (next > last)
+                next = last = first;
+            else
+                next--;
+            ipc_forward_slow(rid, tmp->mp_data.phone,
+                VFS_OUT_LOOKUP, next, last, tmp->mp_data.dev_handle,
+                lflag, index, IPC_FF_ROUTE_FROM_ME);
+            ops->node_put(cur);
+            ops->node_put(tmp);
+            if (par)
+                ops->node_put(par);
+            return;
+        }
         /* handle miss: match amongst siblings */
         if (!tmp) {
             if (next <= last) {
                 /* there are unprocessed components */
         ops->node_put(cur);
     if (tmp)
         ops->node_put(tmp);
+}
+void libfs_stat(libfs_ops_t *ops, fs_handle_t fs_handle, ipc_callid_t rid,
+    ipc_call_t *request)
+{
+    dev_handle_t dev_handle = (dev_handle_t) IPC_GET_ARG1(*request);
+    fs_index_t index = (fs_index_t) IPC_GET_ARG2(*request);
+    fs_node_t *fn = ops->node_get(dev_handle, index);
+    ipc_callid_t callid;
+    size_t size;
+    if (!ipc_data_read_receive(&callid, &size) ||
+        size != sizeof(struct stat)) {
+        ipc_answer_0(callid, EINVAL);
+        ipc_answer_0(rid, EINVAL);
+        return;
+    }
+    struct stat stat;
+    memset(&stat, 0, sizeof(struct stat));
+    stat.fs_handle = fs_handle;
+    stat.dev_handle = dev_handle;
+    stat.index = index;
+    stat.lnkcnt = ops->lnkcnt_get(fn);
+    stat.is_file = ops->is_file(fn);
+    stat.size = ops->size_get(fn);
+    ipc_data_read_finalize(callid, &stat, sizeof(struct stat));
+    ipc_answer_0(rid, EOK);
+}
+/** Open VFS triplet.
+ *
+ * @param ops       libfs operations structure with function pointers to
+ *                  file system implementation
+ * @param rid       Request ID of the VFS_OUT_OPEN_NODE request.
+ * @param request   VFS_OUT_OPEN_NODE request data itself.
+ *
+ */
+void libfs_open_node(libfs_ops_t *ops, fs_handle_t fs_handle, ipc_callid_t rid,
+    ipc_call_t *request)
+{
+    dev_handle_t dev_handle = IPC_GET_ARG1(*request);
+    fs_index_t index = IPC_GET_ARG2(*request);
+    fs_node_t *node = ops->node_get(dev_handle, index);
+    if (node == NULL) {
+        ipc_answer_0(rid, ENOENT);
+        return;
+    }
+    ipc_answer_5(rid, EOK, fs_handle, dev_handle, index,
+        ops->size_get(node), ops->lnkcnt_get(node));
+    ops->node_put(node);
+}
 /** @}
  */

Subversion Repositories HelenOS

(root)/branches/dynload/uspace/lib/libfs/libfs.c @ 3588 – Rev 4389 → 4691