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 * @file
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 * @file
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 * Glue code which is commonod to all FS implementations.
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 * Glue code which is commonod to all FS implementations.
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 */
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 */
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#include "libfs.h"
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#include "libfs.h"
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#include "../../srv/vfs/vfs.h"
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#include <errno.h>
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#include <async.h>
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#include <ipc/ipc.h>
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#include <as.h>
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/** Register file system server.
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 *
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 * This function abstracts away the tedious registration protocol from
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 * file system implementations and lets them to reuse this registration glue
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 * code.
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 *
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 * @param vfs_phone Open phone for communication with VFS.
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 * @param reg       File system registration structure. It will be
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 *          initialized by this function.
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 * @param info      VFS info structure supplied by the file system
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 *          implementation.
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 * @param conn      Connection fibril for handling all calls originating in
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 *          VFS.
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 *
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 * @return      EOK on success or a non-zero error code on errror.
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 */
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int fs_register(int vfs_phone, fs_reg_t *reg, vfs_info_t *info,
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    async_client_conn_t conn)
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{
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    /*
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     * Tell VFS that we are here and want to get registered.
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     * We use the async framework because VFS will answer the request
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     * out-of-order, when it knows that the operation succeeded or failed.
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     */
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    ipc_call_t answer;
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    aid_t req = async_send_0(vfs_phone, VFS_REGISTER, &answer);
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    /*
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     * Send our VFS info structure to VFS.
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     */
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    int rc = ipc_data_send(vfs_phone, info, sizeof(*info));
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    if (rc != EOK) {
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        async_wait_for(req, NULL);
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        return rc;
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    }
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    /*
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     * Ask VFS for callback connection.
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     */
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    ipc_connect_to_me(vfs_phone, 0, 0, 0, &reg->vfs_phonehash);
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    /*
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     * Allocate piece of address space for PLB.
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     */
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    reg->plb_ro = as_get_mappable_page(PLB_SIZE);
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    if (!reg->plb_ro) {
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        async_wait_for(req, NULL);
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        return ENOMEM;
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    }
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    /*
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     * Request sharing the Path Lookup Buffer with VFS.
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     */
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    rc = ipc_call_sync_2_0(vfs_phone, IPC_M_AS_AREA_RECV,
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        (ipcarg_t) reg->plb_ro, PLB_SIZE);
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    if (rc) {
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        async_wait_for(req, NULL);
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        return rc;
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    }
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    /*
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     * Pick up the answer for the request to the VFS_REQUEST call.
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     */
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    async_wait_for(req, NULL);
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    reg->fs_handle = (int) IPC_GET_ARG1(answer);
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    /*
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     * Create a connection fibril to handle the callback connection.
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     */
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    async_new_connection(reg->vfs_phonehash, 0, NULL, conn);
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    /*
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     * Tell the async framework that other connections are to be handled by
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     * the same connection fibril as well.
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     */
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    async_set_client_connection(conn);
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    return IPC_GET_RETVAL(answer);
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}
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/** @}
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/** @}
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 */
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 */