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  1. /*
  2.  * Copyright (c) 2007 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup libfs
  30.  * @{
  31.  */
  32. /**
  33.  * @file
  34.  * Glue code which is commonod to all FS implementations.
  35.  */
  36.  
  37. #include "libfs.h"
  38. #include "../../srv/vfs/vfs.h"
  39. #include <errno.h>
  40. #include <async.h>
  41. #include <ipc/ipc.h>
  42. #include <as.h>
  43.  
  44. /** Register file system server.
  45.  *
  46.  * This function abstracts away the tedious registration protocol from
  47.  * file system implementations and lets them to reuse this registration glue
  48.  * code.
  49.  *
  50.  * @param vfs_phone Open phone for communication with VFS.
  51.  * @param reg       File system registration structure. It will be
  52.  *          initialized by this function.
  53.  * @param info      VFS info structure supplied by the file system
  54.  *          implementation.
  55.  * @param conn      Connection fibril for handling all calls originating in
  56.  *          VFS.
  57.  *
  58.  * @return      EOK on success or a non-zero error code on errror.
  59.  */
  60. int fs_register(int vfs_phone, fs_reg_t *reg, vfs_info_t *info,
  61.     async_client_conn_t conn)
  62. {
  63.     /*
  64.      * Tell VFS that we are here and want to get registered.
  65.      * We use the async framework because VFS will answer the request
  66.      * out-of-order, when it knows that the operation succeeded or failed.
  67.      */
  68.     ipc_call_t answer;
  69.     aid_t req = async_send_0(vfs_phone, VFS_REGISTER, &answer);
  70.  
  71.     /*
  72.      * Send our VFS info structure to VFS.
  73.      */
  74.     int rc = ipc_data_write_start(vfs_phone, info, sizeof(*info));
  75.     if (rc != EOK) {
  76.         async_wait_for(req, NULL);
  77.         return rc;
  78.     }
  79.  
  80.     /*
  81.      * Ask VFS for callback connection.
  82.      */
  83.     ipc_connect_to_me(vfs_phone, 0, 0, 0, &reg->vfs_phonehash);
  84.  
  85.     /*
  86.      * Allocate piece of address space for PLB.
  87.      */
  88.     reg->plb_ro = as_get_mappable_page(PLB_SIZE);
  89.     if (!reg->plb_ro) {
  90.         async_wait_for(req, NULL);
  91.         return ENOMEM;
  92.     }
  93.  
  94.     /*
  95.      * Request sharing the Path Lookup Buffer with VFS.
  96.      */
  97.     rc = ipc_share_in_start_0_0(vfs_phone, reg->plb_ro, PLB_SIZE);
  98.     if (rc) {
  99.         async_wait_for(req, NULL);
  100.         return rc;
  101.     }
  102.      
  103.     /*
  104.      * Pick up the answer for the request to the VFS_REQUEST call.
  105.      */
  106.     async_wait_for(req, NULL);
  107.     reg->fs_handle = (int) IPC_GET_ARG1(answer);
  108.    
  109.     /*
  110.      * Create a connection fibril to handle the callback connection.
  111.      */
  112.     async_new_connection(reg->vfs_phonehash, 0, NULL, conn);
  113.    
  114.     /*
  115.      * Tell the async framework that other connections are to be handled by
  116.      * the same connection fibril as well.
  117.      */
  118.     async_set_client_connection(conn);
  119.  
  120.     return IPC_GET_RETVAL(answer);
  121. }
  122.  
  123. /** @}
  124.  */
  125.