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  • uspace/srv/fs/ext2fs/ext2fs.c

    refcebe1 r79ae36dd  
    11/*
    22 * Copyright (c) 2006 Martin Decky
     3 * Copyright (c) 2008 Jakub Jermar
    34 * Copyright (c) 2011 Martin Sucha
    45 * All rights reserved.
    … …  
    5455};
    5556
     57fs_reg_t ext2fs_reg;
     58
     59/**
     60 * This connection fibril processes VFS requests from VFS.
     61 *
     62 * In order to support simultaneous VFS requests, our design is as follows.
     63 * The connection fibril accepts VFS requests from VFS. If there is only one
     64 * instance of the fibril, VFS will need to serialize all VFS requests it sends
     65 * to EXT2FS. To overcome this bottleneck, VFS can send EXT2FS the IPC_M_CONNECT_ME_TO
     66 * call. In that case, a new connection fibril will be created, which in turn
     67 * will accept the call. Thus, a new phone will be opened for VFS.
     68 *
     69 * There are few issues with this arrangement. First, VFS can run out of
     70 * available phones. In that case, VFS can close some other phones or use one
     71 * phone for more serialized requests. Similarily, EXT2FS can refuse to duplicate
     72 * the connection. VFS should then just make use of already existing phones and
     73 * route its requests through them. To avoid paying the fibril creation price
     74 * upon each request, EXT2FS might want to keep the connections open after the
     75 * request has been completed.
     76 */
     77static void ext2fs_connection(ipc_callid_t iid, ipc_call_t *icall)
     78{
     79        if (iid) {
     80                /*
     81                 * This only happens for connections opened by
     82                 * IPC_M_CONNECT_ME_TO calls as opposed to callback connections
     83                 * created by IPC_M_CONNECT_TO_ME.
     84                 */
     85                async_answer_0(iid, EOK);
     86        }
     87       
     88        dprintf(NAME ": connection opened\n");
     89        while (true) {
     90                ipc_call_t call;
     91                ipc_callid_t callid = async_get_call(&call);
     92               
     93                if (!IPC_GET_IMETHOD(call))
     94                        return;
     95               
     96                switch (IPC_GET_IMETHOD(call)) {
     97                case VFS_OUT_MOUNTED:
     98                        ext2fs_mounted(callid, &call);
     99                        break;
     100                case VFS_OUT_MOUNT:
     101                        ext2fs_mount(callid, &call);
     102                        break;
     103                case VFS_OUT_UNMOUNTED:
     104                        ext2fs_unmounted(callid, &call);
     105                        break;
     106                case VFS_OUT_UNMOUNT:
     107                        ext2fs_unmount(callid, &call);
     108                        break;
     109                case VFS_OUT_LOOKUP:
     110                        ext2fs_lookup(callid, &call);
     111                        break;
     112                case VFS_OUT_READ:
     113                        ext2fs_read(callid, &call);
     114                        break;
     115                case VFS_OUT_WRITE:
     116                        ext2fs_write(callid, &call);
     117                        break;
     118                case VFS_OUT_TRUNCATE:
     119                        ext2fs_truncate(callid, &call);
     120                        break;
     121                case VFS_OUT_STAT:
     122                        ext2fs_stat(callid, &call);
     123                        break;
     124                case VFS_OUT_CLOSE:
     125                        ext2fs_close(callid, &call);
     126                        break;
     127                case VFS_OUT_DESTROY:
     128                        ext2fs_destroy(callid, &call);
     129                        break;
     130                case VFS_OUT_OPEN_NODE:
     131                        ext2fs_open_node(callid, &call);
     132                        break;
     133                case VFS_OUT_SYNC:
     134                        ext2fs_sync(callid, &call);
     135                        break;
     136                default:
     137                        async_answer_0(callid, ENOTSUP);
     138                        break;
     139                }
     140        }
     141}
     142
    56143int main(int argc, char **argv)
    57144{
    … …  
    71158        }       
    72159               
    73         rc = fs_register(vfs_sess, &ext2fs_vfs_info, &ext2fs_ops,
    74             &ext2fs_libfs_ops);
     160        rc = fs_register(vfs_sess, &ext2fs_reg, &ext2fs_vfs_info, ext2fs_connection);
    75161        if (rc != EOK) {
    76162                fprintf(stdout, NAME ": Failed to register fs (%d)\n", rc);
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