| 0,0 → 1,513 |
|---|
| /* |
| * 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 <fibril_sync.h> |
| #include <adt/hash_table.h> |
| #include "devfs.h" |
| #include "devfs_ops.h" |
| |
| #define PLB_GET_CHAR(pos) (devfs_reg.plb_ro[pos % PLB_SIZE]) |
| |
| /** Opened devices structure */ |
| typedef struct { |
| dev_handle_t handle; |
| int phone; |
| size_t refcount; |
| link_t link; |
| } device_t; |
| |
| /** Hash table of opened devices */ |
| static hash_table_t devices; |
| |
| /** Hash table mutex */ |
| static FIBRIL_MUTEX_INITIALIZE(devices_mutex); |
| |
| #define DEVICES_KEYS 1 |
| #define DEVICES_KEY_HANDLE 0 |
| #define DEVICES_BUCKETS 256 |
| |
| /* Implementation of hash table interface for the nodes hash table. */ |
| static hash_index_t devices_hash(unsigned long key[]) |
| { |
| return key[DEVICES_KEY_HANDLE] % DEVICES_BUCKETS; |
| } |
| |
| static int devices_compare(unsigned long key[], hash_count_t keys, link_t *item) |
| { |
| device_t *dev = hash_table_get_instance(item, device_t, link); |
| return (dev->handle == (dev_handle_t) key[DEVICES_KEY_HANDLE]); |
| } |
| |
| static void devices_remove_callback(link_t *item) |
| { |
| free(hash_table_get_instance(item, device_t, link)); |
| } |
| |
| static hash_table_operations_t devices_ops = { |
| .hash = devices_hash, |
| .compare = devices_compare, |
| .remove_callback = devices_remove_callback |
| }; |
| |
| bool devfs_init(void) |
| { |
| if (!hash_table_create(&devices, DEVICES_BUCKETS, |
| DEVICES_KEYS, &devices_ops)) |
| return false; |
| |
| 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; |
| } |
| |
| if ((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) { |
| size_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; |
| } |
| |
| size_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; |
| } |
| |
| if (lflag & L_OPEN) { |
| unsigned long key[] = { |
| [DEVICES_KEY_HANDLE] = (unsigned long) handle |
| }; |
| |
| fibril_mutex_lock(&devices_mutex); |
| link_t *lnk = hash_table_find(&devices, key); |
| if (lnk == NULL) { |
| int phone = devmap_device_connect(handle, 0); |
| if (phone < 0) { |
| fibril_mutex_unlock(&devices_mutex); |
| free(name); |
| ipc_answer_0(rid, ENOENT); |
| return; |
| } |
| |
| device_t *dev = (device_t *) malloc(sizeof(device_t)); |
| if (dev == NULL) { |
| fibril_mutex_unlock(&devices_mutex); |
| free(name); |
| ipc_answer_0(rid, ENOMEM); |
| return; |
| } |
| |
| dev->handle = handle; |
| dev->phone = phone; |
| dev->refcount = 1; |
| |
| hash_table_insert(&devices, key, &dev->link); |
| } else { |
| device_t *dev = hash_table_get_instance(lnk, device_t, link); |
| dev->refcount++; |
| } |
| fibril_mutex_unlock(&devices_mutex); |
| } |
| |
| free(name); |
| |
| ipc_answer_5(rid, EOK, devfs_reg.fs_handle, dev_handle, handle, 0, 1); |
| } else |
| ipc_answer_0(rid, ENOENT); |
| } |
| } |
| |
| void devfs_open_node(ipc_callid_t rid, ipc_call_t *request) |
| { |
| dev_handle_t handle = IPC_GET_ARG2(*request); |
| |
| unsigned long key[] = { |
| [DEVICES_KEY_HANDLE] = (unsigned long) handle |
| }; |
| |
| fibril_mutex_lock(&devices_mutex); |
| link_t *lnk = hash_table_find(&devices, key); |
| if (lnk == NULL) { |
| int phone = devmap_device_connect(handle, 0); |
| if (phone < 0) { |
| fibril_mutex_unlock(&devices_mutex); |
| ipc_answer_0(rid, ENOENT); |
| return; |
| } |
| |
| device_t *dev = (device_t *) malloc(sizeof(device_t)); |
| if (dev == NULL) { |
| fibril_mutex_unlock(&devices_mutex); |
| ipc_answer_0(rid, ENOMEM); |
| return; |
| } |
| |
| dev->handle = handle; |
| dev->phone = phone; |
| dev->refcount = 1; |
| |
| hash_table_insert(&devices, key, &dev->link); |
| } else { |
| device_t *dev = hash_table_get_instance(lnk, device_t, link); |
| dev->refcount++; |
| } |
| fibril_mutex_unlock(&devices_mutex); |
| |
| ipc_answer_3(rid, EOK, 0, 1, L_FILE); |
| } |
| |
| void devfs_device(ipc_callid_t rid, ipc_call_t *request) |
| { |
| fs_index_t index = (fs_index_t) IPC_GET_ARG2(*request); |
| |
| if (index != 0) { |
| unsigned long key[] = { |
| [DEVICES_KEY_HANDLE] = (unsigned long) index |
| }; |
| |
| fibril_mutex_lock(&devices_mutex); |
| link_t *lnk = hash_table_find(&devices, key); |
| if (lnk == NULL) { |
| fibril_mutex_unlock(&devices_mutex); |
| ipc_answer_0(rid, ENOENT); |
| return; |
| } |
| fibril_mutex_unlock(&devices_mutex); |
| |
| ipc_answer_1(rid, EOK, (ipcarg_t) index); |
| } else |
| ipc_answer_0(rid, ENOTSUP); |
| } |
| |
| 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) { |
| unsigned long key[] = { |
| [DEVICES_KEY_HANDLE] = (unsigned long) index |
| }; |
| |
| fibril_mutex_lock(&devices_mutex); |
| link_t *lnk = hash_table_find(&devices, key); |
| if (lnk == NULL) { |
| fibril_mutex_unlock(&devices_mutex); |
| ipc_answer_0(rid, ENOENT); |
| return; |
| } |
| |
| device_t *dev = hash_table_get_instance(lnk, device_t, link); |
| |
| ipc_callid_t callid; |
| if (!ipc_data_read_receive(&callid, NULL)) { |
| fibril_mutex_unlock(&devices_mutex); |
| ipc_answer_0(callid, EINVAL); |
| ipc_answer_0(rid, EINVAL); |
| return; |
| } |
| |
| /* Make a request at the driver */ |
| ipc_call_t answer; |
| aid_t msg = async_send_3(dev->phone, IPC_GET_METHOD(*request), |
| IPC_GET_ARG1(*request), IPC_GET_ARG2(*request), |
| IPC_GET_ARG3(*request), &answer); |
| |
| /* Forward the IPC_M_DATA_READ request to the driver */ |
| ipc_forward_fast(callid, dev->phone, 0, 0, 0, IPC_FF_ROUTE_FROM_ME); |
| fibril_mutex_unlock(&devices_mutex); |
| |
| /* Wait for reply from the driver. */ |
| ipcarg_t rc; |
| async_wait_for(msg, &rc); |
| size_t bytes = IPC_GET_ARG1(answer); |
| |
| /* Driver reply is the final result of the whole operation */ |
| ipc_answer_1(rid, rc, bytes); |
| } else { |
| 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 count = devmap_device_get_count(); |
| dev_desc_t *desc = malloc(count * sizeof(dev_desc_t)); |
| if (desc == NULL) { |
| ipc_answer_0(callid, ENOMEM); |
| ipc_answer_1(rid, ENOMEM, 0); |
| return; |
| } |
| |
| size_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); |
| |
| ipc_answer_1(rid, EOK, 1); |
| } |
| } |
| |
| 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); |
| |
| if (index != 0) { |
| unsigned long key[] = { |
| [DEVICES_KEY_HANDLE] = (unsigned long) index |
| }; |
| |
| fibril_mutex_lock(&devices_mutex); |
| link_t *lnk = hash_table_find(&devices, key); |
| if (lnk == NULL) { |
| fibril_mutex_unlock(&devices_mutex); |
| ipc_answer_0(rid, ENOENT); |
| return; |
| } |
| |
| device_t *dev = hash_table_get_instance(lnk, device_t, link); |
| |
| ipc_callid_t callid; |
| if (!ipc_data_write_receive(&callid, NULL)) { |
| fibril_mutex_unlock(&devices_mutex); |
| ipc_answer_0(callid, EINVAL); |
| ipc_answer_0(rid, EINVAL); |
| return; |
| } |
| |
| /* Make a request at the driver */ |
| ipc_call_t answer; |
| aid_t msg = async_send_3(dev->phone, IPC_GET_METHOD(*request), |
| IPC_GET_ARG1(*request), IPC_GET_ARG2(*request), |
| IPC_GET_ARG3(*request), &answer); |
| |
| /* Forward the IPC_M_DATA_WRITE request to the driver */ |
| ipc_forward_fast(callid, dev->phone, 0, 0, 0, IPC_FF_ROUTE_FROM_ME); |
| |
| fibril_mutex_unlock(&devices_mutex); |
| |
| /* Wait for reply from the driver. */ |
| ipcarg_t rc; |
| async_wait_for(msg, &rc); |
| size_t bytes = IPC_GET_ARG1(answer); |
| |
| /* Driver reply is the final result of the whole operation */ |
| ipc_answer_1(rid, rc, bytes); |
| } else { |
| /* Read-only filesystem */ |
| ipc_answer_0(rid, ENOTSUP); |
| } |
| } |
| |
| void devfs_truncate(ipc_callid_t rid, ipc_call_t *request) |
| { |
| ipc_answer_0(rid, ENOTSUP); |
| } |
| |
| void devfs_close(ipc_callid_t rid, ipc_call_t *request) |
| { |
| fs_index_t index = (fs_index_t) IPC_GET_ARG2(*request); |
| |
| if (index != 0) { |
| unsigned long key[] = { |
| [DEVICES_KEY_HANDLE] = (unsigned long) index |
| }; |
| |
| fibril_mutex_lock(&devices_mutex); |
| link_t *lnk = hash_table_find(&devices, key); |
| if (lnk == NULL) { |
| fibril_mutex_unlock(&devices_mutex); |
| ipc_answer_0(rid, ENOENT); |
| return; |
| } |
| |
| device_t *dev = hash_table_get_instance(lnk, device_t, link); |
| dev->refcount--; |
| |
| if (dev->refcount == 0) { |
| ipc_hangup(dev->phone); |
| hash_table_remove(&devices, key, DEVICES_KEYS); |
| } |
| |
| fibril_mutex_unlock(&devices_mutex); |
| |
| ipc_answer_0(rid, EOK); |
| } else |
| ipc_answer_0(rid, ENOTSUP); |
| } |
| |
| void devfs_sync(ipc_callid_t rid, ipc_call_t *request) |
| { |
| fs_index_t index = (fs_index_t) IPC_GET_ARG2(*request); |
| |
| if (index != 0) { |
| unsigned long key[] = { |
| [DEVICES_KEY_HANDLE] = (unsigned long) index |
| }; |
| |
| fibril_mutex_lock(&devices_mutex); |
| link_t *lnk = hash_table_find(&devices, key); |
| if (lnk == NULL) { |
| fibril_mutex_unlock(&devices_mutex); |
| ipc_answer_0(rid, ENOENT); |
| return; |
| } |
| |
| device_t *dev = hash_table_get_instance(lnk, device_t, link); |
| |
| /* Make a request at the driver */ |
| ipc_call_t answer; |
| aid_t msg = async_send_2(dev->phone, IPC_GET_METHOD(*request), |
| IPC_GET_ARG1(*request), IPC_GET_ARG2(*request), &answer); |
| |
| fibril_mutex_unlock(&devices_mutex); |
| |
| /* Wait for reply from the driver */ |
| ipcarg_t rc; |
| async_wait_for(msg, &rc); |
| |
| /* Driver reply is the final result of the whole operation */ |
| ipc_answer_0(rid, rc); |
| } else |
| ipc_answer_0(rid, ENOTSUP); |
| } |
| |
| void devfs_destroy(ipc_callid_t rid, ipc_call_t *request) |
| { |
| ipc_answer_0(rid, ENOTSUP); |
| } |
| |
| /** |
| * @} |
| */ |