source: mainline/uspace/srv/vfs/vfs_ipc.c@ a46e56b

/*
 * Copyright (c) 2008 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:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <vfs/vfs.h>
#include "vfs.h"

#include <errno.h>
#include <stdlib.h>
#include <str.h>
#include <vfs/canonify.h>

static void vfs_in_clone(cap_call_handle_t rid, ipc_call_t *request)
{
        int oldfd = IPC_GET_ARG1(*request);
        int newfd = IPC_GET_ARG2(*request);
        bool desc = IPC_GET_ARG3(*request);

        int outfd = -1;
        errno_t rc = vfs_op_clone(oldfd, newfd, desc, &outfd);
        async_answer_1(rid, rc, outfd);
}

static void vfs_in_fsprobe(cap_call_handle_t rid, ipc_call_t *request)
{
        service_id_t service_id = (service_id_t) IPC_GET_ARG1(*request);
        char *fs_name = NULL;
        cap_call_handle_t chandle;
        vfs_fs_probe_info_t info;
        size_t len;
        errno_t rc;

        /*
         * Now we expect the client to send us data with the name of the file
         * system.
         */
        rc = async_data_write_accept((void **) &fs_name, true, 0,
            FS_NAME_MAXLEN, 0, NULL);
        if (rc != EOK) {
                async_answer_0(rid, rc);
                return;
        }

        rc = vfs_op_fsprobe(fs_name, service_id, &info);
        async_answer_0(rid, rc);
        if (rc != EOK)
                goto out;

        /* Now we should get a read request */
        if (!async_data_read_receive(&chandle, &len))
                goto out;

        if (len > sizeof(info))
                len = sizeof(info);
        (void) async_data_read_finalize(chandle, &info, len);

out:
        free(fs_name);
}

static void vfs_in_fstypes(cap_call_handle_t rid, ipc_call_t *request)
{
        cap_call_handle_t chandle;
        size_t len;
        vfs_fstypes_t fstypes;
        errno_t rc;

        rc = vfs_get_fstypes(&fstypes);
        if (rc != EOK) {
                async_answer_0(rid, ENOMEM);
                return;
        }

        /* Send size of the data */
        async_answer_1(rid, EOK, fstypes.size);

        /* Now we should get a read request */
        if (!async_data_read_receive(&chandle, &len))
                goto out;

        if (len > fstypes.size)
                len = fstypes.size;
        (void) async_data_read_finalize(chandle, fstypes.buf, len);

out:
        vfs_fstypes_free(&fstypes);
}

static void vfs_in_mount(cap_call_handle_t rid, ipc_call_t *request)
{
        int mpfd = IPC_GET_ARG1(*request);

        /*
         * We expect the library to do the device-name to device-handle
         * translation for us, thus the device handle will arrive as ARG1
         * in the request.
         */
        service_id_t service_id = (service_id_t) IPC_GET_ARG2(*request);

        unsigned int flags = (unsigned int) IPC_GET_ARG3(*request);
        unsigned int instance = IPC_GET_ARG4(*request);

        char *opts = NULL;
        char *fs_name = NULL;

        /* Now we expect to receive the mount options. */
        errno_t rc = async_data_write_accept((void **) &opts, true, 0,
            MAX_MNTOPTS_LEN, 0, NULL);
        if (rc != EOK) {
                async_answer_0(rid, rc);
                return;
        }

        /* Now, we expect the client to send us data with the name of the file
         * system.
         */
        rc = async_data_write_accept((void **) &fs_name, true, 0,
            FS_NAME_MAXLEN, 0, NULL);
        if (rc != EOK) {
                free(opts);
                async_answer_0(rid, rc);
                return;
        }

        int outfd = 0;
        rc = vfs_op_mount(mpfd, service_id, flags, instance, opts, fs_name,
             &outfd);
        async_answer_1(rid, rc, outfd);

        free(opts);
        free(fs_name);
}

static void vfs_in_open(cap_call_handle_t rid, ipc_call_t *request)
{
        int fd = IPC_GET_ARG1(*request);
        int mode = IPC_GET_ARG2(*request);

        errno_t rc = vfs_op_open(fd, mode);
        async_answer_0(rid, rc);
}

static void vfs_in_put(cap_call_handle_t rid, ipc_call_t *request)
{
        int fd = IPC_GET_ARG1(*request);
        errno_t rc = vfs_op_put(fd);
        async_answer_0(rid, rc);
}

static void vfs_in_read(cap_call_handle_t rid, ipc_call_t *request)
{
        int fd = IPC_GET_ARG1(*request);
        aoff64_t pos = MERGE_LOUP32(IPC_GET_ARG2(*request),
            IPC_GET_ARG3(*request));

        size_t bytes = 0;
        errno_t rc = vfs_op_read(fd, pos, &bytes);
        async_answer_1(rid, rc, bytes);
}

static void vfs_in_rename(cap_call_handle_t rid, ipc_call_t *request)
{
        /* The common base directory. */
        int basefd;
        char *old = NULL;
        char *new = NULL;
        errno_t rc;

        basefd = IPC_GET_ARG1(*request);

        /* Retrieve the old path. */
        rc = async_data_write_accept((void **) &old, true, 0, 0, 0, NULL);
        if (rc != EOK)
                goto out;

        /* Retrieve the new path. */
        rc = async_data_write_accept((void **) &new, true, 0, 0, 0, NULL);
        if (rc != EOK)
                goto out;

        size_t olen;
        size_t nlen;
        char *oldc = canonify(old, &olen);
        char *newc = canonify(new, &nlen);

        if ((!oldc) || (!newc)) {
                rc = EINVAL;
                goto out;
        }

        assert(oldc[olen] == '\0');
        assert(newc[nlen] == '\0');

        rc = vfs_op_rename(basefd, oldc, newc);

out:
        async_answer_0(rid, rc);

        if (old)
                free(old);
        if (new)
                free(new);
}

static void vfs_in_resize(cap_call_handle_t rid, ipc_call_t *request)
{
        int fd = IPC_GET_ARG1(*request);
        int64_t size = MERGE_LOUP32(IPC_GET_ARG2(*request), IPC_GET_ARG3(*request));
        errno_t rc = vfs_op_resize(fd, size);
        async_answer_0(rid, rc);
}

static void vfs_in_stat(cap_call_handle_t rid, ipc_call_t *request)
{
        int fd = IPC_GET_ARG1(*request);
        errno_t rc = vfs_op_stat(fd);
        async_answer_0(rid, rc);
}

static void vfs_in_statfs(cap_call_handle_t rid, ipc_call_t *request)
{
        int fd = (int) IPC_GET_ARG1(*request);

        errno_t rc = vfs_op_statfs(fd);
        async_answer_0(rid, rc);
}

static void vfs_in_sync(cap_call_handle_t rid, ipc_call_t *request)
{
        int fd = IPC_GET_ARG1(*request);
        errno_t rc = vfs_op_sync(fd);
        async_answer_0(rid, rc);
}

static void vfs_in_unlink(cap_call_handle_t rid, ipc_call_t *request)
{
        int parentfd = IPC_GET_ARG1(*request);
        int expectfd = IPC_GET_ARG2(*request);

        char *path;
        errno_t rc = async_data_write_accept((void **) &path, true, 0, 0, 0, NULL);
        if (rc == EOK)
                rc = vfs_op_unlink(parentfd, expectfd, path);

        async_answer_0(rid, rc);
}

static void vfs_in_unmount(cap_call_handle_t rid, ipc_call_t *request)
{
        int mpfd = IPC_GET_ARG1(*request);
        errno_t rc = vfs_op_unmount(mpfd);
        async_answer_0(rid, rc);
}

static void vfs_in_wait_handle(cap_call_handle_t rid, ipc_call_t *request)
{
        bool high_fd = IPC_GET_ARG1(*request);
        int fd = -1;
        errno_t rc = vfs_op_wait_handle(high_fd, &fd);
        async_answer_1(rid, rc, fd);
}

static void vfs_in_walk(cap_call_handle_t rid, ipc_call_t *request)
{
        /*
         * Parent is our relative root for file lookup.
         * For defined flags, see <ipc/vfs.h>.
         */
        int parentfd = IPC_GET_ARG1(*request);
        int flags = IPC_GET_ARG2(*request);

        int fd = 0;
        char *path;
        errno_t rc = async_data_write_accept((void **)&path, true, 0, 0, 0, NULL);
        if (rc == EOK) {
                rc = vfs_op_walk(parentfd, flags, path, &fd);
                free(path);
        }
        async_answer_1(rid, rc, fd);
}

static void vfs_in_write(cap_call_handle_t rid, ipc_call_t *request)
{
        int fd = IPC_GET_ARG1(*request);
        aoff64_t pos = MERGE_LOUP32(IPC_GET_ARG2(*request),
            IPC_GET_ARG3(*request));

        size_t bytes = 0;
        errno_t rc = vfs_op_write(fd, pos, &bytes);
        async_answer_1(rid, rc, bytes);
}

void vfs_connection(cap_call_handle_t icall_handle, ipc_call_t *icall, void *arg)
{
        bool cont = true;

        /*
         * The connection was opened via the IPC_CONNECT_ME_TO call.
         * This call needs to be answered.
         */
        async_answer_0(icall_handle, EOK);

        while (cont) {
                ipc_call_t call;
                cap_call_handle_t chandle = async_get_call(&call);

                if (!IPC_GET_IMETHOD(call))
                        break;

                switch (IPC_GET_IMETHOD(call)) {
                case VFS_IN_CLONE:
                        vfs_in_clone(chandle, &call);
                        break;
                case VFS_IN_FSPROBE:
                        vfs_in_fsprobe(chandle, &call);
                        break;
                case VFS_IN_FSTYPES:
                        vfs_in_fstypes(chandle, &call);
                        break;
                case VFS_IN_MOUNT:
                        vfs_in_mount(chandle, &call);
                        break;
                case VFS_IN_OPEN:
                        vfs_in_open(chandle, &call);
                        break;
                case VFS_IN_PUT:
                        vfs_in_put(chandle, &call);
                        break;
                case VFS_IN_READ:
                        vfs_in_read(chandle, &call);
                        break;
                case VFS_IN_REGISTER:
                        vfs_register(chandle, &call);
                        cont = false;
                        break;
                case VFS_IN_RENAME:
                        vfs_in_rename(chandle, &call);
                        break;
                case VFS_IN_RESIZE:
                        vfs_in_resize(chandle, &call);
                        break;
                case VFS_IN_STAT:
                        vfs_in_stat(chandle, &call);
                        break;
                case VFS_IN_STATFS:
                        vfs_in_statfs(chandle, &call);
                        break;
                case VFS_IN_SYNC:
                        vfs_in_sync(chandle, &call);
                        break;
                case VFS_IN_UNLINK:
                        vfs_in_unlink(chandle, &call);
                        break;
                case VFS_IN_UNMOUNT:
                        vfs_in_unmount(chandle, &call);
                        break;
                case VFS_IN_WAIT_HANDLE:
                        vfs_in_wait_handle(chandle, &call);
                        break;
                case VFS_IN_WALK:
                        vfs_in_walk(chandle, &call);
                        break;
                case VFS_IN_WRITE:
                        vfs_in_write(chandle, &call);
                        break;
                default:
                        async_answer_0(chandle, ENOTSUP);
                        break;
                }
        }

        /*
         * Open files for this client will be cleaned up when its last
         * connection fibril terminates.
         */
}