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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4417 | decky | 1 | /* |
| 2 | * Copyright (c) 2009 Martin Decky |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 29 | /** @addtogroup fs |
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| 30 | * @{ |
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| 31 | */ |
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| 32 | |||
| 33 | /** |
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| 34 | * @file devfs_ops.c |
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| 35 | * @brief Implementation of VFS operations for the devfs file system server. |
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| 36 | */ |
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| 37 | |||
| 38 | #include <ipc/ipc.h> |
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| 39 | #include <bool.h> |
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| 40 | #include <errno.h> |
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| 41 | #include <malloc.h> |
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| 42 | #include <string.h> |
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| 43 | #include <libfs.h> |
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| 4464 | decky | 44 | #include <libadt/hash_table.h> |
| 4417 | decky | 45 | #include "devfs.h" |
| 46 | #include "devfs_ops.h" |
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| 47 | |||
| 48 | #define PLB_GET_CHAR(pos) (devfs_reg.plb_ro[pos % PLB_SIZE]) |
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| 49 | |||
| 4464 | decky | 50 | /** Opened devices structure */ |
| 51 | typedef struct { |
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| 52 | dev_handle_t handle; |
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| 53 | int phone; |
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| 54 | size_t refcount; |
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| 55 | link_t link; |
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| 56 | } device_t; |
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| 57 | |||
| 58 | /** Hash table of opened devices */ |
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| 59 | static hash_table_t devices; |
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| 60 | |||
| 61 | #define DEVICES_KEYS 1 |
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| 62 | #define DEVICES_KEY_HANDLE 0 |
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| 63 | #define DEVICES_BUCKETS 256 |
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| 64 | |||
| 65 | /* Implementation of hash table interface for the nodes hash table. */ |
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| 66 | static hash_index_t devices_hash(unsigned long key[]) |
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| 67 | { |
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| 68 | return key[DEVICES_KEY_HANDLE] % DEVICES_BUCKETS; |
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| 69 | } |
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| 70 | |||
| 71 | static int devices_compare(unsigned long key[], hash_count_t keys, link_t *item) |
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| 72 | { |
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| 73 | device_t *dev = hash_table_get_instance(item, device_t, link); |
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| 74 | return (dev->handle == (dev_handle_t) key[DEVICES_KEY_HANDLE]); |
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| 75 | } |
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| 76 | |||
| 77 | static void devices_remove_callback(link_t *item) |
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| 78 | { |
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| 79 | free(hash_table_get_instance(item, device_t, link)); |
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| 80 | } |
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| 81 | |||
| 82 | static hash_table_operations_t devices_ops = { |
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| 83 | .hash = devices_hash, |
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| 84 | .compare = devices_compare, |
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| 85 | .remove_callback = devices_remove_callback |
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| 86 | }; |
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| 87 | |||
| 4417 | decky | 88 | bool devfs_init(void) |
| 89 | { |
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| 4464 | decky | 90 | if (!hash_table_create(&devices, DEVICES_BUCKETS, |
| 91 | DEVICES_KEYS, &devices_ops)) |
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| 92 | return false; |
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| 93 | |||
| 4417 | decky | 94 | if (devmap_get_phone(DEVMAP_CLIENT, IPC_FLAG_BLOCKING) < 0) |
| 95 | return false; |
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| 96 | |||
| 97 | return true; |
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| 98 | } |
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| 99 | |||
| 100 | void devfs_mounted(ipc_callid_t rid, ipc_call_t *request) |
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| 101 | { |
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| 102 | /* Accept the mount options */ |
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| 103 | ipc_callid_t callid; |
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| 104 | size_t size; |
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| 105 | if (!ipc_data_write_receive(&callid, &size)) { |
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| 106 | ipc_answer_0(callid, EINVAL); |
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| 107 | ipc_answer_0(rid, EINVAL); |
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| 108 | return; |
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| 109 | } |
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| 110 | |||
| 111 | char *opts = malloc(size + 1); |
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| 112 | if (!opts) { |
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| 113 | ipc_answer_0(callid, ENOMEM); |
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| 114 | ipc_answer_0(rid, ENOMEM); |
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| 115 | return; |
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| 116 | } |
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| 117 | |||
| 118 | ipcarg_t retval = ipc_data_write_finalize(callid, opts, size); |
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| 119 | if (retval != EOK) { |
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| 120 | ipc_answer_0(rid, retval); |
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| 121 | free(opts); |
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| 122 | return; |
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| 123 | } |
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| 124 | |||
| 125 | free(opts); |
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| 126 | |||
| 127 | ipc_answer_3(rid, EOK, 0, 0, 0); |
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| 128 | } |
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| 129 | |||
| 130 | void devfs_mount(ipc_callid_t rid, ipc_call_t *request) |
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| 131 | { |
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| 132 | ipc_answer_0(rid, ENOTSUP); |
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| 133 | } |
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| 134 | |||
| 135 | void devfs_lookup(ipc_callid_t rid, ipc_call_t *request) |
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| 136 | { |
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| 137 | ipcarg_t first = IPC_GET_ARG1(*request); |
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| 138 | ipcarg_t last = IPC_GET_ARG2(*request); |
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| 139 | dev_handle_t dev_handle = IPC_GET_ARG3(*request); |
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| 140 | ipcarg_t lflag = IPC_GET_ARG4(*request); |
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| 141 | fs_index_t index = IPC_GET_ARG5(*request); |
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| 142 | |||
| 143 | /* Hierarchy is flat, no altroot is supported */ |
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| 144 | if (index != 0) { |
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| 145 | ipc_answer_0(rid, ENOENT); |
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| 146 | return; |
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| 147 | } |
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| 148 | |||
| 4464 | decky | 149 | if ((lflag & L_LINK) || (lflag & L_UNLINK)) { |
| 4417 | decky | 150 | ipc_answer_0(rid, ENOTSUP); |
| 151 | return; |
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| 152 | } |
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| 153 | |||
| 154 | /* Eat slash */ |
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| 155 | if (PLB_GET_CHAR(first) == '/') { |
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| 156 | first++; |
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| 157 | first %= PLB_SIZE; |
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| 158 | } |
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| 159 | |||
| 160 | if (first >= last) { |
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| 161 | /* Root entry */ |
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| 162 | if (lflag & L_DIRECTORY) |
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| 163 | ipc_answer_5(rid, EOK, devfs_reg.fs_handle, dev_handle, 0, 0, 0); |
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| 164 | else |
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| 165 | ipc_answer_0(rid, ENOENT); |
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| 166 | } else { |
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| 167 | if (lflag & L_FILE) { |
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| 4464 | decky | 168 | size_t len; |
| 4417 | decky | 169 | if (last >= first) |
| 170 | len = last - first + 1; |
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| 171 | else |
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| 172 | len = first + PLB_SIZE - last + 1; |
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| 173 | |||
| 174 | char *name = (char *) malloc(len + 1); |
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| 175 | if (name == NULL) { |
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| 176 | ipc_answer_0(rid, ENOMEM); |
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| 177 | return; |
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| 178 | } |
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| 179 | |||
| 4464 | decky | 180 | size_t i; |
| 4417 | decky | 181 | for (i = 0; i < len; i++) |
| 182 | name[i] = PLB_GET_CHAR(first + i); |
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| 183 | |||
| 184 | name[len] = 0; |
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| 185 | |||
| 186 | dev_handle_t handle; |
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| 187 | if (devmap_device_get_handle(name, &handle, 0) != EOK) { |
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| 188 | free(name); |
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| 189 | ipc_answer_0(rid, ENOENT); |
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| 190 | return; |
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| 191 | } |
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| 192 | |||
| 4464 | decky | 193 | if (lflag & L_OPEN) { |
| 194 | unsigned long key[] = { |
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| 195 | [DEVICES_KEY_HANDLE] = (unsigned long) handle |
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| 196 | }; |
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| 197 | |||
| 198 | link_t *lnk = hash_table_find(&devices, key); |
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| 199 | if (lnk == NULL) { |
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| 200 | int phone = devmap_device_connect(handle, 0); |
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| 201 | if (phone < 0) { |
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| 202 | free(name); |
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| 203 | ipc_answer_0(rid, ENOENT); |
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| 204 | return; |
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| 205 | } |
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| 206 | |||
| 207 | device_t *dev = (device_t *) malloc(sizeof(device_t)); |
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| 208 | if (dev == NULL) { |
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| 209 | free(name); |
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| 210 | ipc_answer_0(rid, ENOMEM); |
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| 211 | return; |
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| 212 | } |
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| 213 | |||
| 214 | dev->handle = handle; |
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| 215 | dev->phone = phone; |
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| 216 | dev->refcount = 1; |
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| 217 | |||
| 218 | hash_table_insert(&devices, key, &dev->link); |
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| 219 | } else { |
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| 220 | device_t *dev = hash_table_get_instance(lnk, device_t, link); |
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| 221 | dev->refcount++; |
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| 222 | } |
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| 223 | } |
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| 224 | |||
| 4417 | decky | 225 | free(name); |
| 226 | |||
| 227 | ipc_answer_5(rid, EOK, devfs_reg.fs_handle, dev_handle, handle, 0, 1); |
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| 228 | } else |
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| 229 | ipc_answer_0(rid, ENOENT); |
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| 230 | } |
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| 231 | } |
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| 232 | |||
| 4464 | decky | 233 | void devfs_open_node(ipc_callid_t rid, ipc_call_t *request) |
| 234 | { |
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| 235 | dev_handle_t handle = IPC_GET_ARG2(*request); |
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| 236 | |||
| 237 | unsigned long key[] = { |
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| 238 | [DEVICES_KEY_HANDLE] = (unsigned long) handle |
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| 239 | }; |
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| 240 | |||
| 241 | link_t *lnk = hash_table_find(&devices, key); |
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| 242 | if (lnk == NULL) { |
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| 243 | int phone = devmap_device_connect(handle, 0); |
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| 244 | if (phone < 0) { |
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| 245 | ipc_answer_0(rid, ENOENT); |
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| 246 | return; |
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| 247 | } |
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| 248 | |||
| 249 | device_t *dev = (device_t *) malloc(sizeof(device_t)); |
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| 250 | if (dev == NULL) { |
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| 251 | ipc_answer_0(rid, ENOMEM); |
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| 252 | return; |
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| 253 | } |
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| 254 | |||
| 255 | dev->handle = handle; |
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| 256 | dev->phone = phone; |
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| 257 | dev->refcount = 1; |
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| 258 | |||
| 259 | hash_table_insert(&devices, key, &dev->link); |
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| 260 | } else { |
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| 261 | device_t *dev = hash_table_get_instance(lnk, device_t, link); |
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| 262 | dev->refcount++; |
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| 263 | } |
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| 264 | |||
| 265 | ipc_answer_3(rid, EOK, 0, 1, L_FILE); |
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| 266 | } |
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| 267 | |||
| 268 | void devfs_device(ipc_callid_t rid, ipc_call_t *request) |
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| 269 | { |
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| 270 | fs_index_t index = (fs_index_t) IPC_GET_ARG2(*request); |
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| 271 | |||
| 272 | if (index != 0) { |
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| 273 | unsigned long key[] = { |
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| 274 | [DEVICES_KEY_HANDLE] = (unsigned long) index |
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| 275 | }; |
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| 276 | |||
| 277 | link_t *lnk = hash_table_find(&devices, key); |
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| 278 | if (lnk == NULL) { |
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| 279 | ipc_answer_0(rid, ENOENT); |
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| 280 | return; |
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| 281 | } |
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| 282 | |||
| 283 | ipc_answer_1(rid, EOK, (ipcarg_t) index); |
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| 284 | } else |
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| 285 | ipc_answer_0(rid, ENOTSUP); |
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| 286 | } |
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| 287 | |||
| 4417 | decky | 288 | void devfs_read(ipc_callid_t rid, ipc_call_t *request) |
| 289 | { |
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| 290 | fs_index_t index = (fs_index_t) IPC_GET_ARG2(*request); |
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| 291 | off_t pos = (off_t) IPC_GET_ARG3(*request); |
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| 292 | |||
| 293 | if (index != 0) { |
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| 4464 | decky | 294 | unsigned long key[] = { |
| 295 | [DEVICES_KEY_HANDLE] = (unsigned long) index |
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| 296 | }; |
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| 297 | |||
| 298 | link_t *lnk = hash_table_find(&devices, key); |
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| 299 | if (lnk == NULL) { |
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| 300 | ipc_answer_0(rid, ENOENT); |
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| 301 | return; |
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| 302 | } |
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| 303 | |||
| 304 | device_t *dev = hash_table_get_instance(lnk, device_t, link); |
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| 305 | |||
| 306 | ipc_callid_t callid; |
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| 307 | if (!ipc_data_read_receive(&callid, NULL)) { |
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| 308 | ipc_answer_0(callid, EINVAL); |
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| 309 | ipc_answer_0(rid, EINVAL); |
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| 310 | return; |
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| 311 | } |
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| 312 | |||
| 313 | /* Make a request at the driver */ |
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| 314 | ipc_call_t answer; |
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| 315 | aid_t msg = async_send_3(dev->phone, IPC_GET_METHOD(*request), |
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| 316 | IPC_GET_ARG1(*request), IPC_GET_ARG2(*request), |
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| 317 | IPC_GET_ARG3(*request), &answer); |
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| 318 | |||
| 319 | /* Forward the IPC_M_DATA_READ request to the driver */ |
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| 320 | ipc_forward_fast(callid, dev->phone, 0, 0, 0, IPC_FF_ROUTE_FROM_ME); |
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| 321 | |||
| 322 | /* Wait for reply from the driver. */ |
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| 323 | ipcarg_t rc; |
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| 324 | async_wait_for(msg, &rc); |
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| 325 | size_t bytes = IPC_GET_ARG1(answer); |
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| 326 | |||
| 327 | /* Driver reply is the final result of the whole operation */ |
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| 328 | ipc_answer_1(rid, rc, bytes); |
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| 4417 | decky | 329 | } else { |
| 4464 | decky | 330 | ipc_callid_t callid; |
| 331 | size_t size; |
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| 332 | if (!ipc_data_read_receive(&callid, &size)) { |
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| 333 | ipc_answer_0(callid, EINVAL); |
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| 334 | ipc_answer_0(rid, EINVAL); |
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| 335 | return; |
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| 336 | } |
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| 337 | |||
| 338 | size_t count = devmap_device_get_count(); |
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| 4417 | decky | 339 | dev_desc_t *desc = malloc(count * sizeof(dev_desc_t)); |
| 340 | if (desc == NULL) { |
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| 4464 | decky | 341 | ipc_answer_0(callid, ENOMEM); |
| 342 | ipc_answer_1(rid, ENOMEM, 0); |
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| 4417 | decky | 343 | return; |
| 344 | } |
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| 345 | |||
| 4464 | decky | 346 | size_t max = devmap_device_get_devices(count, desc); |
| 4417 | decky | 347 | |
| 348 | if (pos < max) { |
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| 349 | ipc_data_read_finalize(callid, desc[pos].name, str_size(desc[pos].name) + 1); |
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| 350 | } else { |
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| 351 | ipc_answer_0(callid, ENOENT); |
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| 352 | ipc_answer_1(rid, ENOENT, 0); |
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| 353 | return; |
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| 354 | } |
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| 355 | |||
| 356 | free(desc); |
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| 4464 | decky | 357 | |
| 358 | ipc_answer_1(rid, EOK, 1); |
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| 4417 | decky | 359 | } |
| 360 | } |
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| 361 | |||
| 362 | void devfs_write(ipc_callid_t rid, ipc_call_t *request) |
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| 363 | { |
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| 364 | fs_index_t index = (fs_index_t) IPC_GET_ARG2(*request); |
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| 365 | off_t pos = (off_t) IPC_GET_ARG3(*request); |
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| 366 | |||
| 4464 | decky | 367 | if (index != 0) { |
| 368 | unsigned long key[] = { |
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| 369 | [DEVICES_KEY_HANDLE] = (unsigned long) index |
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| 370 | }; |
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| 371 | |||
| 372 | link_t *lnk = hash_table_find(&devices, key); |
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| 373 | if (lnk == NULL) { |
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| 374 | ipc_answer_0(rid, ENOENT); |
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| 375 | return; |
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| 376 | } |
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| 377 | |||
| 378 | device_t *dev = hash_table_get_instance(lnk, device_t, link); |
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| 379 | |||
| 380 | ipc_callid_t callid; |
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| 381 | if (!ipc_data_write_receive(&callid, NULL)) { |
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| 382 | ipc_answer_0(callid, EINVAL); |
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| 383 | ipc_answer_0(rid, EINVAL); |
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| 384 | return; |
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| 385 | } |
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| 386 | |||
| 387 | /* Make a request at the driver */ |
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| 388 | ipc_call_t answer; |
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| 389 | aid_t msg = async_send_3(dev->phone, IPC_GET_METHOD(*request), |
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| 390 | IPC_GET_ARG1(*request), IPC_GET_ARG2(*request), |
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| 391 | IPC_GET_ARG3(*request), &answer); |
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| 392 | |||
| 393 | /* Forward the IPC_M_DATA_WRITE request to the driver */ |
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| 394 | ipc_forward_fast(callid, dev->phone, 0, 0, 0, IPC_FF_ROUTE_FROM_ME); |
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| 395 | |||
| 396 | /* Wait for reply from the driver. */ |
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| 397 | ipcarg_t rc; |
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| 398 | async_wait_for(msg, &rc); |
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| 399 | size_t bytes = IPC_GET_ARG1(answer); |
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| 400 | |||
| 401 | /* Driver reply is the final result of the whole operation */ |
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| 402 | ipc_answer_1(rid, rc, bytes); |
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| 403 | } else { |
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| 404 | /* Read-only filesystem */ |
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| 405 | ipc_answer_0(rid, ENOTSUP); |
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| 4417 | decky | 406 | } |
| 407 | } |
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| 408 | |||
| 409 | void devfs_truncate(ipc_callid_t rid, ipc_call_t *request) |
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| 410 | { |
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| 411 | ipc_answer_0(rid, ENOTSUP); |
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| 412 | } |
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| 413 | |||
| 4464 | decky | 414 | void devfs_close(ipc_callid_t rid, ipc_call_t *request) |
| 415 | { |
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| 416 | fs_index_t index = (fs_index_t) IPC_GET_ARG2(*request); |
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| 417 | |||
| 418 | if (index != 0) { |
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| 419 | unsigned long key[] = { |
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| 420 | [DEVICES_KEY_HANDLE] = (unsigned long) index |
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| 421 | }; |
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| 422 | |||
| 423 | link_t *lnk = hash_table_find(&devices, key); |
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| 424 | if (lnk == NULL) { |
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| 425 | ipc_answer_0(rid, ENOENT); |
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| 426 | return; |
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| 427 | } |
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| 428 | |||
| 429 | device_t *dev = hash_table_get_instance(lnk, device_t, link); |
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| 430 | dev->refcount--; |
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| 431 | |||
| 432 | if (dev->refcount == 0) { |
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| 433 | ipc_hangup(dev->phone); |
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| 434 | hash_table_remove(&devices, key, DEVICES_KEYS); |
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| 435 | } |
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| 436 | |||
| 437 | ipc_answer_0(rid, EOK); |
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| 438 | } else |
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| 439 | ipc_answer_0(rid, ENOTSUP); |
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| 440 | } |
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| 441 | |||
| 442 | void devfs_sync(ipc_callid_t rid, ipc_call_t *request) |
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| 443 | { |
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| 444 | fs_index_t index = (fs_index_t) IPC_GET_ARG2(*request); |
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| 445 | |||
| 446 | if (index != 0) { |
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| 447 | unsigned long key[] = { |
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| 448 | [DEVICES_KEY_HANDLE] = (unsigned long) index |
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| 449 | }; |
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| 450 | |||
| 451 | link_t *lnk = hash_table_find(&devices, key); |
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| 452 | if (lnk == NULL) { |
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| 453 | ipc_answer_0(rid, ENOENT); |
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| 454 | return; |
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| 455 | } |
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| 456 | |||
| 457 | device_t *dev = hash_table_get_instance(lnk, device_t, link); |
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| 458 | |||
| 459 | /* Make a request at the driver */ |
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| 460 | ipc_call_t answer; |
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| 461 | aid_t msg = async_send_2(dev->phone, IPC_GET_METHOD(*request), |
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| 462 | IPC_GET_ARG1(*request), IPC_GET_ARG2(*request), &answer); |
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| 463 | |||
| 464 | /* Wait for reply from the driver */ |
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| 465 | ipcarg_t rc; |
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| 466 | async_wait_for(msg, &rc); |
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| 467 | |||
| 468 | /* Driver reply is the final result of the whole operation */ |
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| 469 | ipc_answer_0(rid, rc); |
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| 470 | } else |
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| 471 | ipc_answer_0(rid, ENOTSUP); |
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| 472 | } |
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| 473 | |||
| 4417 | decky | 474 | void devfs_destroy(ipc_callid_t rid, ipc_call_t *request) |
| 475 | { |
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| 476 | ipc_answer_0(rid, ENOTSUP); |
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| 477 | } |
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| 478 | |||
| 479 | /** |
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| 480 | * @} |
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| 4464 | decky | 481 | */ |