| 0,0 → 1,242 |
|---|
| /* |
| * Copyright (c) 2009 Martin Decky |
| * 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. |
| */ |
| |
| /** @addtogroup fs |
| * @{ |
| */ |
| |
| /** |
| * @file devfs_ops.c |
| * @brief Implementation of VFS operations for the devfs file system server. |
| */ |
| |
| #include <ipc/ipc.h> |
| #include <bool.h> |
| #include <errno.h> |
| #include <malloc.h> |
| #include <string.h> |
| #include <libfs.h> |
| #include "devfs.h" |
| #include "devfs_ops.h" |
| |
| #define PLB_GET_CHAR(pos) (devfs_reg.plb_ro[pos % PLB_SIZE]) |
| |
| bool devfs_init(void) |
| { |
| if (devmap_get_phone(DEVMAP_CLIENT, IPC_FLAG_BLOCKING) < 0) |
| return false; |
| |
| return true; |
| } |
| |
| void devfs_mounted(ipc_callid_t rid, ipc_call_t *request) |
| { |
| /* Accept the mount options */ |
| ipc_callid_t callid; |
| size_t size; |
| if (!ipc_data_write_receive(&callid, &size)) { |
| ipc_answer_0(callid, EINVAL); |
| ipc_answer_0(rid, EINVAL); |
| return; |
| } |
| |
| char *opts = malloc(size + 1); |
| if (!opts) { |
| ipc_answer_0(callid, ENOMEM); |
| ipc_answer_0(rid, ENOMEM); |
| return; |
| } |
| |
| ipcarg_t retval = ipc_data_write_finalize(callid, opts, size); |
| if (retval != EOK) { |
| ipc_answer_0(rid, retval); |
| free(opts); |
| return; |
| } |
| |
| free(opts); |
| |
| ipc_answer_3(rid, EOK, 0, 0, 0); |
| } |
| |
| void devfs_mount(ipc_callid_t rid, ipc_call_t *request) |
| { |
| ipc_answer_0(rid, ENOTSUP); |
| } |
| |
| void devfs_lookup(ipc_callid_t rid, ipc_call_t *request) |
| { |
| ipcarg_t first = IPC_GET_ARG1(*request); |
| ipcarg_t last = IPC_GET_ARG2(*request); |
| dev_handle_t dev_handle = IPC_GET_ARG3(*request); |
| ipcarg_t lflag = IPC_GET_ARG4(*request); |
| fs_index_t index = IPC_GET_ARG5(*request); |
| |
| /* Hierarchy is flat, no altroot is supported */ |
| if (index != 0) { |
| ipc_answer_0(rid, ENOENT); |
| return; |
| } |
| |
| /* This is a read-only filesystem */ |
| if ((lflag & L_CREATE) || (lflag & L_LINK) || (lflag & L_UNLINK)) { |
| ipc_answer_0(rid, ENOTSUP); |
| return; |
| } |
| |
| /* Eat slash */ |
| if (PLB_GET_CHAR(first) == '/') { |
| first++; |
| first %= PLB_SIZE; |
| } |
| |
| if (first >= last) { |
| /* Root entry */ |
| if (lflag & L_DIRECTORY) |
| ipc_answer_5(rid, EOK, devfs_reg.fs_handle, dev_handle, 0, 0, 0); |
| else |
| ipc_answer_0(rid, ENOENT); |
| } else { |
| if (lflag & L_FILE) { |
| count_t len; |
| if (last >= first) |
| len = last - first + 1; |
| else |
| len = first + PLB_SIZE - last + 1; |
| |
| char *name = (char *) malloc(len + 1); |
| if (name == NULL) { |
| ipc_answer_0(rid, ENOMEM); |
| return; |
| } |
| |
| count_t i; |
| for (i = 0; i < len; i++) |
| name[i] = PLB_GET_CHAR(first + i); |
| |
| name[len] = 0; |
| |
| dev_handle_t handle; |
| if (devmap_device_get_handle(name, &handle, 0) != EOK) { |
| free(name); |
| ipc_answer_0(rid, ENOENT); |
| return; |
| } |
| |
| free(name); |
| |
| ipc_answer_5(rid, EOK, devfs_reg.fs_handle, dev_handle, handle, 0, 1); |
| } else |
| ipc_answer_0(rid, ENOENT); |
| } |
| } |
| |
| void devfs_read(ipc_callid_t rid, ipc_call_t *request) |
| { |
| fs_index_t index = (fs_index_t) IPC_GET_ARG2(*request); |
| off_t pos = (off_t) IPC_GET_ARG3(*request); |
| |
| if (index != 0) { |
| ipc_answer_1(rid, ENOENT, 0); |
| return; |
| } |
| |
| /* |
| * Receive the read request. |
| */ |
| ipc_callid_t callid; |
| size_t size; |
| if (!ipc_data_read_receive(&callid, &size)) { |
| ipc_answer_0(callid, EINVAL); |
| ipc_answer_0(rid, EINVAL); |
| return; |
| } |
| |
| size_t bytes = 0; |
| if (index != 0) { |
| (void) ipc_data_read_finalize(callid, NULL, bytes); |
| } else { |
| count_t count = devmap_device_get_count(); |
| dev_desc_t *desc = malloc(count * sizeof(dev_desc_t)); |
| if (desc == NULL) { |
| ipc_answer_0(callid, ENOENT); |
| ipc_answer_1(rid, ENOENT, 0); |
| return; |
| } |
| |
| count_t max = devmap_device_get_devices(count, desc); |
| |
| if (pos < max) { |
| ipc_data_read_finalize(callid, desc[pos].name, str_size(desc[pos].name) + 1); |
| } else { |
| ipc_answer_0(callid, ENOENT); |
| ipc_answer_1(rid, ENOENT, 0); |
| return; |
| } |
| |
| free(desc); |
| bytes = 1; |
| } |
| |
| ipc_answer_1(rid, EOK, bytes); |
| } |
| |
| void devfs_write(ipc_callid_t rid, ipc_call_t *request) |
| { |
| fs_index_t index = (fs_index_t) IPC_GET_ARG2(*request); |
| off_t pos = (off_t) IPC_GET_ARG3(*request); |
| |
| /* |
| * Receive the write request. |
| */ |
| ipc_callid_t callid; |
| size_t size; |
| if (!ipc_data_write_receive(&callid, &size)) { |
| ipc_answer_0(callid, EINVAL); |
| ipc_answer_0(rid, EINVAL); |
| return; |
| } |
| |
| // TODO |
| ipc_answer_0(callid, ENOENT); |
| ipc_answer_2(rid, ENOENT, 0, 0); |
| } |
| |
| void devfs_truncate(ipc_callid_t rid, ipc_call_t *request) |
| { |
| ipc_answer_0(rid, ENOTSUP); |
| } |
| |
| void devfs_destroy(ipc_callid_t rid, ipc_call_t *request) |
| { |
| ipc_answer_0(rid, ENOTSUP); |
| } |
| |
| /** |
| * @} |
| */ |