Evgeniy Polyakov | d35eef1 | 2009-02-09 17:02:40 +0300 | [diff] [blame] | 1 | /* |
| 2 | * 2007+ Copyright (c) Evgeniy Polyakov <zbr@ioremap.net> |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | */ |
| 15 | |
| 16 | #include <linux/fsnotify.h> |
| 17 | #include <linux/jhash.h> |
| 18 | #include <linux/in.h> |
| 19 | #include <linux/in6.h> |
| 20 | #include <linux/kthread.h> |
| 21 | #include <linux/pagemap.h> |
| 22 | #include <linux/poll.h> |
| 23 | #include <linux/swap.h> |
| 24 | #include <linux/syscalls.h> |
Alexander Beregalov | 898a6cb | 2009-02-13 17:35:32 +0300 | [diff] [blame] | 25 | #include <linux/vmalloc.h> |
Evgeniy Polyakov | d35eef1 | 2009-02-09 17:02:40 +0300 | [diff] [blame] | 26 | |
| 27 | #include "netfs.h" |
| 28 | |
Evgeniy Polyakov | d35eef1 | 2009-02-09 17:02:40 +0300 | [diff] [blame] | 29 | /* |
| 30 | * Async machinery lives here. |
| 31 | * All commands being sent to server do _not_ require sync reply, |
| 32 | * instead, if it is really needed, like readdir or readpage, caller |
| 33 | * sleeps waiting for data, which will be placed into provided buffer |
| 34 | * and caller will be awakened. |
| 35 | * |
| 36 | * Every command response can come without some listener. For example |
| 37 | * readdir response will add new objects into cache without appropriate |
| 38 | * request from userspace. This is used in cache coherency. |
| 39 | * |
| 40 | * If object is not found for given data, it is discarded. |
| 41 | * |
| 42 | * All requests are received by dedicated kernel thread. |
| 43 | */ |
| 44 | |
| 45 | /* |
| 46 | * Basic network sending/receiving functions. |
| 47 | * Blocked mode is used. |
| 48 | */ |
| 49 | static int netfs_data_recv(struct netfs_state *st, void *buf, u64 size) |
| 50 | { |
| 51 | struct msghdr msg; |
| 52 | struct kvec iov; |
| 53 | int err; |
| 54 | |
| 55 | BUG_ON(!size); |
| 56 | |
| 57 | iov.iov_base = buf; |
| 58 | iov.iov_len = size; |
| 59 | |
| 60 | msg.msg_iov = (struct iovec *)&iov; |
| 61 | msg.msg_iovlen = 1; |
| 62 | msg.msg_name = NULL; |
| 63 | msg.msg_namelen = 0; |
| 64 | msg.msg_control = NULL; |
| 65 | msg.msg_controllen = 0; |
| 66 | msg.msg_flags = MSG_DONTWAIT; |
| 67 | |
| 68 | err = kernel_recvmsg(st->socket, &msg, &iov, 1, iov.iov_len, |
| 69 | msg.msg_flags); |
| 70 | if (err <= 0) { |
| 71 | printk("%s: failed to recv data: size: %llu, err: %d.\n", __func__, size, err); |
| 72 | if (err == 0) |
| 73 | err = -ECONNRESET; |
| 74 | } |
| 75 | |
| 76 | return err; |
| 77 | } |
| 78 | |
| 79 | static int pohmelfs_data_recv(struct netfs_state *st, void *data, unsigned int size) |
| 80 | { |
| 81 | unsigned int revents = 0; |
| 82 | unsigned int err_mask = POLLERR | POLLHUP | POLLRDHUP; |
| 83 | unsigned int mask = err_mask | POLLIN; |
| 84 | int err = 0; |
| 85 | |
| 86 | while (size && !err) { |
| 87 | revents = netfs_state_poll(st); |
| 88 | |
| 89 | if (!(revents & mask)) { |
| 90 | DEFINE_WAIT(wait); |
| 91 | |
| 92 | for (;;) { |
| 93 | prepare_to_wait(&st->thread_wait, &wait, TASK_INTERRUPTIBLE); |
| 94 | if (kthread_should_stop()) |
| 95 | break; |
| 96 | |
| 97 | revents = netfs_state_poll(st); |
| 98 | |
| 99 | if (revents & mask) |
| 100 | break; |
| 101 | |
| 102 | if (signal_pending(current)) |
| 103 | break; |
| 104 | |
| 105 | schedule(); |
| 106 | continue; |
| 107 | } |
| 108 | finish_wait(&st->thread_wait, &wait); |
| 109 | } |
| 110 | |
| 111 | err = 0; |
| 112 | netfs_state_lock(st); |
| 113 | if (st->socket && (st->read_socket == st->socket) && (revents & POLLIN)) { |
| 114 | err = netfs_data_recv(st, data, size); |
| 115 | if (err > 0) { |
| 116 | data += err; |
| 117 | size -= err; |
| 118 | err = 0; |
| 119 | } else if (err == 0) |
| 120 | err = -ECONNRESET; |
| 121 | } |
| 122 | |
| 123 | if (revents & err_mask) { |
| 124 | printk("%s: revents: %x, socket: %p, size: %u, err: %d.\n", |
| 125 | __func__, revents, st->socket, size, err); |
| 126 | err = -ECONNRESET; |
| 127 | } |
| 128 | netfs_state_unlock(st); |
| 129 | |
| 130 | if (err < 0) { |
| 131 | if (netfs_state_trylock_send(st)) { |
| 132 | netfs_state_exit(st); |
| 133 | err = netfs_state_init(st); |
| 134 | if (!err) |
| 135 | err = -EAGAIN; |
| 136 | netfs_state_unlock_send(st); |
| 137 | } else { |
| 138 | st->need_reset = 1; |
| 139 | } |
| 140 | } |
| 141 | |
| 142 | if (kthread_should_stop()) |
| 143 | err = -ENODEV; |
| 144 | |
| 145 | if (err) |
| 146 | printk("%s: socket: %p, read_socket: %p, revents: %x, rev_error: %d, " |
| 147 | "should_stop: %d, size: %u, err: %d.\n", |
| 148 | __func__, st->socket, st->read_socket, |
| 149 | revents, revents & err_mask, kthread_should_stop(), size, err); |
| 150 | } |
| 151 | |
| 152 | return err; |
| 153 | } |
| 154 | |
| 155 | int pohmelfs_data_recv_and_check(struct netfs_state *st, void *data, unsigned int size) |
| 156 | { |
| 157 | struct netfs_cmd *cmd = &st->cmd; |
| 158 | int err; |
| 159 | |
| 160 | err = pohmelfs_data_recv(st, data, size); |
| 161 | if (err) |
| 162 | return err; |
| 163 | |
| 164 | return pohmelfs_crypto_process_input_data(&st->eng, cmd->iv, data, NULL, size); |
| 165 | } |
| 166 | |
| 167 | /* |
| 168 | * Polling machinery. |
| 169 | */ |
| 170 | |
Bill Pemberton | 385e3f1 | 2009-04-22 08:59:13 -0400 | [diff] [blame] | 171 | struct netfs_poll_helper { |
Evgeniy Polyakov | d35eef1 | 2009-02-09 17:02:40 +0300 | [diff] [blame] | 172 | poll_table pt; |
| 173 | struct netfs_state *st; |
| 174 | }; |
| 175 | |
| 176 | static int netfs_queue_wake(wait_queue_t *wait, unsigned mode, int sync, void *key) |
| 177 | { |
| 178 | struct netfs_state *st = container_of(wait, struct netfs_state, wait); |
| 179 | |
| 180 | wake_up(&st->thread_wait); |
| 181 | return 1; |
| 182 | } |
| 183 | |
| 184 | static void netfs_queue_func(struct file *file, wait_queue_head_t *whead, |
| 185 | poll_table *pt) |
| 186 | { |
| 187 | struct netfs_state *st = container_of(pt, struct netfs_poll_helper, pt)->st; |
| 188 | |
| 189 | st->whead = whead; |
| 190 | init_waitqueue_func_entry(&st->wait, netfs_queue_wake); |
| 191 | add_wait_queue(whead, &st->wait); |
| 192 | } |
| 193 | |
| 194 | static void netfs_poll_exit(struct netfs_state *st) |
| 195 | { |
| 196 | if (st->whead) { |
| 197 | remove_wait_queue(st->whead, &st->wait); |
| 198 | st->whead = NULL; |
| 199 | } |
| 200 | } |
| 201 | |
| 202 | static int netfs_poll_init(struct netfs_state *st) |
| 203 | { |
| 204 | struct netfs_poll_helper ph; |
| 205 | |
| 206 | ph.st = st; |
| 207 | init_poll_funcptr(&ph.pt, &netfs_queue_func); |
| 208 | |
| 209 | st->socket->ops->poll(NULL, st->socket, &ph.pt); |
| 210 | return 0; |
| 211 | } |
| 212 | |
| 213 | /* |
| 214 | * Get response for readpage command. We search inode and page in its mapping |
| 215 | * and copy data into. If it was async request, then we queue page into shared |
| 216 | * data and wakeup listener, who will copy it to userspace. |
| 217 | * |
| 218 | * There is a work in progress of allowing to call copy_to_user() directly from |
| 219 | * async receiving kernel thread. |
| 220 | */ |
| 221 | static int pohmelfs_read_page_response(struct netfs_state *st) |
| 222 | { |
| 223 | struct pohmelfs_sb *psb = st->psb; |
| 224 | struct netfs_cmd *cmd = &st->cmd; |
| 225 | struct inode *inode; |
| 226 | struct page *page; |
| 227 | int err = 0; |
| 228 | |
| 229 | if (cmd->size > PAGE_CACHE_SIZE) { |
| 230 | err = -EINVAL; |
| 231 | goto err_out_exit; |
| 232 | } |
| 233 | |
| 234 | inode = ilookup(st->psb->sb, cmd->id); |
| 235 | if (!inode) { |
| 236 | printk("%s: failed to find inode: id: %llu.\n", __func__, cmd->id); |
| 237 | err = -ENOENT; |
| 238 | goto err_out_exit; |
| 239 | } |
| 240 | |
| 241 | page = find_get_page(inode->i_mapping, cmd->start >> PAGE_CACHE_SHIFT); |
| 242 | if (!page || !PageLocked(page)) { |
| 243 | printk("%s: failed to find/lock page: page: %p, id: %llu, start: %llu, index: %llu.\n", |
| 244 | __func__, page, cmd->id, cmd->start, cmd->start >> PAGE_CACHE_SHIFT); |
| 245 | |
| 246 | while (cmd->size) { |
| 247 | unsigned int sz = min(cmd->size, st->size); |
| 248 | |
| 249 | err = pohmelfs_data_recv(st, st->data, sz); |
| 250 | if (err) |
| 251 | break; |
| 252 | |
| 253 | cmd->size -= sz; |
| 254 | } |
| 255 | |
| 256 | err = -ENODEV; |
| 257 | if (page) |
| 258 | goto err_out_page_put; |
| 259 | goto err_out_put; |
| 260 | } |
| 261 | |
| 262 | if (cmd->size) { |
| 263 | void *addr; |
| 264 | |
| 265 | addr = kmap(page); |
| 266 | err = pohmelfs_data_recv(st, addr, cmd->size); |
| 267 | kunmap(page); |
| 268 | |
| 269 | if (err) |
| 270 | goto err_out_page_unlock; |
| 271 | } |
| 272 | |
| 273 | dprintk("%s: page: %p, start: %llu, size: %u, locked: %d.\n", |
| 274 | __func__, page, cmd->start, cmd->size, PageLocked(page)); |
| 275 | |
| 276 | SetPageChecked(page); |
| 277 | if ((psb->hash_string || psb->cipher_string) && psb->perform_crypto && cmd->size) { |
| 278 | err = pohmelfs_crypto_process_input_page(&st->eng, page, cmd->size, cmd->iv); |
| 279 | if (err < 0) |
| 280 | goto err_out_page_unlock; |
| 281 | } else { |
| 282 | SetPageUptodate(page); |
| 283 | unlock_page(page); |
| 284 | page_cache_release(page); |
| 285 | } |
| 286 | |
| 287 | pohmelfs_put_inode(POHMELFS_I(inode)); |
| 288 | wake_up(&st->psb->wait); |
| 289 | |
| 290 | return 0; |
| 291 | |
| 292 | err_out_page_unlock: |
| 293 | SetPageError(page); |
| 294 | unlock_page(page); |
| 295 | err_out_page_put: |
| 296 | page_cache_release(page); |
| 297 | err_out_put: |
| 298 | pohmelfs_put_inode(POHMELFS_I(inode)); |
| 299 | err_out_exit: |
| 300 | wake_up(&st->psb->wait); |
| 301 | return err; |
| 302 | } |
| 303 | |
| 304 | static int pohmelfs_check_name(struct pohmelfs_inode *parent, struct qstr *str, |
| 305 | struct netfs_inode_info *info) |
| 306 | { |
| 307 | struct inode *inode; |
| 308 | struct pohmelfs_name *n; |
| 309 | int err = 0; |
| 310 | u64 ino = 0; |
| 311 | |
| 312 | mutex_lock(&parent->offset_lock); |
| 313 | n = pohmelfs_search_hash(parent, str->hash); |
| 314 | if (n) |
| 315 | ino = n->ino; |
| 316 | mutex_unlock(&parent->offset_lock); |
| 317 | |
| 318 | if (!ino) |
| 319 | goto out; |
| 320 | |
| 321 | inode = ilookup(parent->vfs_inode.i_sb, ino); |
| 322 | if (!inode) |
| 323 | goto out; |
| 324 | |
| 325 | dprintk("%s: parent: %llu, inode: %llu.\n", __func__, parent->ino, ino); |
| 326 | |
| 327 | pohmelfs_fill_inode(inode, info); |
| 328 | pohmelfs_put_inode(POHMELFS_I(inode)); |
| 329 | err = -EEXIST; |
| 330 | out: |
| 331 | return err; |
| 332 | } |
| 333 | |
| 334 | /* |
| 335 | * Readdir response from server. If special field is set, we wakeup |
| 336 | * listener (readdir() call), which will copy data to userspace. |
| 337 | */ |
| 338 | static int pohmelfs_readdir_response(struct netfs_state *st) |
| 339 | { |
| 340 | struct inode *inode; |
| 341 | struct netfs_cmd *cmd = &st->cmd; |
| 342 | struct netfs_inode_info *info; |
| 343 | struct pohmelfs_inode *parent = NULL, *npi; |
| 344 | int err = 0, last = cmd->ext; |
| 345 | struct qstr str; |
| 346 | |
| 347 | if (cmd->size > st->size) |
| 348 | return -EINVAL; |
| 349 | |
| 350 | inode = ilookup(st->psb->sb, cmd->id); |
| 351 | if (!inode) { |
| 352 | printk("%s: failed to find inode: id: %llu.\n", __func__, cmd->id); |
| 353 | return -ENOENT; |
| 354 | } |
| 355 | parent = POHMELFS_I(inode); |
| 356 | |
| 357 | if (!cmd->size && cmd->start) { |
| 358 | err = -cmd->start; |
| 359 | goto out; |
| 360 | } |
| 361 | |
| 362 | if (cmd->size) { |
| 363 | char *name; |
| 364 | |
| 365 | err = pohmelfs_data_recv_and_check(st, st->data, cmd->size); |
| 366 | if (err) |
| 367 | goto err_out_put; |
| 368 | |
| 369 | info = (struct netfs_inode_info *)(st->data); |
| 370 | |
| 371 | name = (char *)(info + 1); |
| 372 | str.len = cmd->size - sizeof(struct netfs_inode_info) - 1 - cmd->cpad; |
| 373 | name[str.len] = 0; |
| 374 | str.name = name; |
| 375 | str.hash = jhash(str.name, str.len, 0); |
| 376 | |
| 377 | netfs_convert_inode_info(info); |
| 378 | |
| 379 | if (parent) { |
| 380 | err = pohmelfs_check_name(parent, &str, info); |
| 381 | if (err) { |
| 382 | if (err == -EEXIST) |
| 383 | err = 0; |
| 384 | goto out; |
| 385 | } |
| 386 | } |
| 387 | |
| 388 | info->ino = cmd->start; |
| 389 | if (!info->ino) |
| 390 | info->ino = pohmelfs_new_ino(st->psb); |
| 391 | |
| 392 | dprintk("%s: parent: %llu, ino: %llu, name: '%s', hash: %x, len: %u, mode: %o.\n", |
| 393 | __func__, parent->ino, info->ino, str.name, str.hash, str.len, |
| 394 | info->mode); |
| 395 | |
| 396 | npi = pohmelfs_new_inode(st->psb, parent, &str, info, 0); |
| 397 | if (IS_ERR(npi)) { |
| 398 | err = PTR_ERR(npi); |
| 399 | |
| 400 | if (err != -EEXIST) |
| 401 | goto err_out_put; |
| 402 | } else { |
Evgeniy Polyakov | 288a9a8 | 2009-03-27 15:04:18 +0300 | [diff] [blame] | 403 | struct dentry *dentry, *alias, *pd; |
| 404 | |
Evgeniy Polyakov | d35eef1 | 2009-02-09 17:02:40 +0300 | [diff] [blame] | 405 | set_bit(NETFS_INODE_REMOTE_SYNCED, &npi->state); |
| 406 | clear_bit(NETFS_INODE_OWNED, &npi->state); |
Evgeniy Polyakov | 288a9a8 | 2009-03-27 15:04:18 +0300 | [diff] [blame] | 407 | |
| 408 | pd = d_find_alias(&parent->vfs_inode); |
| 409 | if (pd) { |
| 410 | str.hash = full_name_hash(str.name, str.len); |
| 411 | dentry = d_alloc(pd, &str); |
| 412 | if (dentry) { |
| 413 | alias = d_materialise_unique(dentry, &npi->vfs_inode); |
| 414 | if (alias) |
| 415 | dput(dentry); |
| 416 | } |
| 417 | |
| 418 | dput(dentry); |
| 419 | dput(pd); |
| 420 | } |
Evgeniy Polyakov | d35eef1 | 2009-02-09 17:02:40 +0300 | [diff] [blame] | 421 | } |
| 422 | } |
| 423 | out: |
| 424 | if (last) { |
| 425 | set_bit(NETFS_INODE_REMOTE_DIR_SYNCED, &parent->state); |
| 426 | set_bit(NETFS_INODE_REMOTE_SYNCED, &parent->state); |
| 427 | wake_up(&st->psb->wait); |
| 428 | } |
| 429 | pohmelfs_put_inode(parent); |
| 430 | |
| 431 | return err; |
| 432 | |
| 433 | err_out_put: |
| 434 | clear_bit(NETFS_INODE_REMOTE_DIR_SYNCED, &parent->state); |
| 435 | printk("%s: parent: %llu, ino: %llu, cmd_id: %llu.\n", __func__, parent->ino, cmd->start, cmd->id); |
| 436 | pohmelfs_put_inode(parent); |
| 437 | wake_up(&st->psb->wait); |
| 438 | return err; |
| 439 | } |
| 440 | |
| 441 | /* |
| 442 | * Lookup command response. |
| 443 | * It searches for inode to be looked at (if it exists) and substitutes |
| 444 | * its inode information (size, permission, mode and so on), if inode does |
| 445 | * not exist, new one will be created and inserted into caches. |
| 446 | */ |
| 447 | static int pohmelfs_lookup_response(struct netfs_state *st) |
| 448 | { |
| 449 | struct inode *inode = NULL; |
| 450 | struct netfs_cmd *cmd = &st->cmd; |
| 451 | struct netfs_inode_info *info; |
| 452 | struct pohmelfs_inode *parent = NULL, *npi; |
| 453 | int err = -EINVAL; |
| 454 | char *name; |
| 455 | |
| 456 | inode = ilookup(st->psb->sb, cmd->id); |
| 457 | if (!inode) { |
| 458 | printk("%s: lookup response: id: %llu, start: %llu, size: %u.\n", |
| 459 | __func__, cmd->id, cmd->start, cmd->size); |
| 460 | err = -ENOENT; |
| 461 | goto err_out_exit; |
| 462 | } |
| 463 | parent = POHMELFS_I(inode); |
| 464 | |
| 465 | if (!cmd->size) { |
| 466 | err = -cmd->start; |
| 467 | goto err_out_put; |
| 468 | } |
| 469 | |
| 470 | if (cmd->size < sizeof(struct netfs_inode_info)) { |
| 471 | printk("%s: broken lookup response: id: %llu, start: %llu, size: %u.\n", |
| 472 | __func__, cmd->id, cmd->start, cmd->size); |
| 473 | err = -EINVAL; |
| 474 | goto err_out_put; |
| 475 | } |
| 476 | |
| 477 | err = pohmelfs_data_recv_and_check(st, st->data, cmd->size); |
| 478 | if (err) |
| 479 | goto err_out_put; |
| 480 | |
| 481 | info = (struct netfs_inode_info *)(st->data); |
| 482 | name = (char *)(info + 1); |
| 483 | |
| 484 | netfs_convert_inode_info(info); |
| 485 | |
| 486 | info->ino = cmd->start; |
| 487 | if (!info->ino) |
| 488 | info->ino = pohmelfs_new_ino(st->psb); |
| 489 | |
| 490 | dprintk("%s: parent: %llu, ino: %llu, name: '%s', start: %llu.\n", |
| 491 | __func__, parent->ino, info->ino, name, cmd->start); |
| 492 | |
| 493 | if (cmd->start) |
| 494 | npi = pohmelfs_new_inode(st->psb, parent, NULL, info, 0); |
| 495 | else { |
| 496 | struct qstr str; |
| 497 | |
| 498 | str.name = name; |
| 499 | str.len = cmd->size - sizeof(struct netfs_inode_info) - 1 - cmd->cpad; |
| 500 | str.hash = jhash(name, str.len, 0); |
| 501 | |
| 502 | npi = pohmelfs_new_inode(st->psb, parent, &str, info, 0); |
| 503 | } |
| 504 | if (IS_ERR(npi)) { |
| 505 | err = PTR_ERR(npi); |
| 506 | |
| 507 | if (err != -EEXIST) |
| 508 | goto err_out_put; |
| 509 | } else { |
| 510 | set_bit(NETFS_INODE_REMOTE_SYNCED, &npi->state); |
| 511 | clear_bit(NETFS_INODE_OWNED, &npi->state); |
| 512 | } |
| 513 | |
| 514 | clear_bit(NETFS_COMMAND_PENDING, &parent->state); |
| 515 | pohmelfs_put_inode(parent); |
| 516 | |
| 517 | wake_up(&st->psb->wait); |
| 518 | |
| 519 | return 0; |
| 520 | |
| 521 | err_out_put: |
| 522 | pohmelfs_put_inode(parent); |
| 523 | err_out_exit: |
| 524 | clear_bit(NETFS_COMMAND_PENDING, &parent->state); |
| 525 | wake_up(&st->psb->wait); |
| 526 | printk("%s: inode: %p, id: %llu, start: %llu, size: %u, err: %d.\n", |
| 527 | __func__, inode, cmd->id, cmd->start, cmd->size, err); |
| 528 | return err; |
| 529 | } |
| 530 | |
| 531 | /* |
| 532 | * Create response, just marks local inode as 'created', so that writeback |
| 533 | * for any of its children (or own) would not try to sync it again. |
| 534 | */ |
| 535 | static int pohmelfs_create_response(struct netfs_state *st) |
| 536 | { |
| 537 | struct inode *inode; |
| 538 | struct netfs_cmd *cmd = &st->cmd; |
| 539 | struct pohmelfs_inode *pi; |
| 540 | |
| 541 | inode = ilookup(st->psb->sb, cmd->id); |
| 542 | if (!inode) { |
| 543 | printk("%s: failed to find inode: id: %llu, start: %llu.\n", |
| 544 | __func__, cmd->id, cmd->start); |
| 545 | goto err_out_exit; |
| 546 | } |
| 547 | |
| 548 | pi = POHMELFS_I(inode); |
| 549 | |
| 550 | /* |
| 551 | * To lock or not to lock? |
| 552 | * We actually do not care if it races... |
| 553 | */ |
| 554 | if (cmd->start) |
| 555 | make_bad_inode(inode); |
| 556 | set_bit(NETFS_INODE_REMOTE_SYNCED, &pi->state); |
| 557 | |
| 558 | pohmelfs_put_inode(pi); |
| 559 | |
| 560 | wake_up(&st->psb->wait); |
| 561 | return 0; |
| 562 | |
| 563 | err_out_exit: |
| 564 | wake_up(&st->psb->wait); |
| 565 | return -ENOENT; |
| 566 | } |
| 567 | |
| 568 | /* |
| 569 | * Object remove response. Just says that remove request has been received. |
| 570 | * Used in cache coherency protocol. |
| 571 | */ |
| 572 | static int pohmelfs_remove_response(struct netfs_state *st) |
| 573 | { |
| 574 | struct netfs_cmd *cmd = &st->cmd; |
| 575 | int err; |
| 576 | |
| 577 | err = pohmelfs_data_recv_and_check(st, st->data, cmd->size); |
| 578 | if (err) |
| 579 | return err; |
| 580 | |
| 581 | dprintk("%s: parent: %llu, path: '%s'.\n", __func__, cmd->id, (char *)st->data); |
| 582 | |
| 583 | return 0; |
| 584 | } |
| 585 | |
| 586 | /* |
| 587 | * Transaction reply processing. |
| 588 | * |
| 589 | * Find transaction based on its generation number, bump its reference counter, |
| 590 | * so that none could free it under us, drop from the trees and lists and |
| 591 | * drop reference counter. When it hits zero (when all destinations replied |
| 592 | * and all timeout handled by async scanning code), completion will be called |
| 593 | * and transaction will be freed. |
| 594 | */ |
| 595 | static int pohmelfs_transaction_response(struct netfs_state *st) |
| 596 | { |
| 597 | struct netfs_trans_dst *dst; |
| 598 | struct netfs_trans *t = NULL; |
| 599 | struct netfs_cmd *cmd = &st->cmd; |
| 600 | short err = (signed)cmd->ext; |
| 601 | |
| 602 | mutex_lock(&st->trans_lock); |
| 603 | dst = netfs_trans_search(st, cmd->start); |
| 604 | if (dst) { |
| 605 | netfs_trans_remove_nolock(dst, st); |
| 606 | t = dst->trans; |
Evgeniy Polyakov | d35eef1 | 2009-02-09 17:02:40 +0300 | [diff] [blame] | 607 | } |
| 608 | mutex_unlock(&st->trans_lock); |
| 609 | |
| 610 | if (!t) { |
Evgeniy Polyakov | 50e4bab | 2009-03-27 15:04:27 +0300 | [diff] [blame] | 611 | printk("%s: failed to find transaction: start: %llu: id: %llu, size: %u, ext: %u.\n", |
| 612 | __func__, cmd->start, cmd->id, cmd->size, cmd->ext); |
Evgeniy Polyakov | d35eef1 | 2009-02-09 17:02:40 +0300 | [diff] [blame] | 613 | err = -EINVAL; |
| 614 | goto out; |
| 615 | } |
| 616 | |
| 617 | t->result = err; |
| 618 | netfs_trans_drop_dst_nostate(dst); |
| 619 | |
| 620 | out: |
| 621 | wake_up(&st->psb->wait); |
| 622 | return err; |
| 623 | } |
| 624 | |
| 625 | /* |
| 626 | * Inode metadata cache coherency message. |
| 627 | */ |
| 628 | static int pohmelfs_page_cache_response(struct netfs_state *st) |
| 629 | { |
| 630 | struct netfs_cmd *cmd = &st->cmd; |
| 631 | struct inode *inode; |
| 632 | |
| 633 | dprintk("%s: st: %p, id: %llu, start: %llu, size: %u.\n", __func__, st, cmd->id, cmd->start, cmd->size); |
| 634 | |
| 635 | inode = ilookup(st->psb->sb, cmd->id); |
| 636 | if (!inode) { |
| 637 | printk("%s: failed to find inode: id: %llu.\n", __func__, cmd->id); |
| 638 | return -ENOENT; |
| 639 | } |
| 640 | |
| 641 | set_bit(NETFS_INODE_NEED_FLUSH, &POHMELFS_I(inode)->state); |
| 642 | pohmelfs_put_inode(POHMELFS_I(inode)); |
| 643 | |
| 644 | return 0; |
| 645 | } |
| 646 | |
| 647 | /* |
| 648 | * Root capabilities response: export statistics |
| 649 | * like used and available size, number of files and dirs, |
| 650 | * permissions. |
| 651 | */ |
| 652 | static int pohmelfs_root_cap_response(struct netfs_state *st) |
| 653 | { |
| 654 | struct netfs_cmd *cmd = &st->cmd; |
| 655 | struct netfs_root_capabilities *cap; |
| 656 | struct pohmelfs_sb *psb = st->psb; |
| 657 | |
| 658 | if (cmd->size != sizeof(struct netfs_root_capabilities)) { |
| 659 | psb->flags = EPROTO; |
| 660 | wake_up(&psb->wait); |
| 661 | return -EPROTO; |
| 662 | } |
| 663 | |
| 664 | cap = st->data; |
| 665 | |
| 666 | netfs_convert_root_capabilities(cap); |
| 667 | |
| 668 | if (psb->total_size < cap->used + cap->avail) |
| 669 | psb->total_size = cap->used + cap->avail; |
| 670 | if (cap->avail) |
| 671 | psb->avail_size = cap->avail; |
| 672 | psb->state_flags = cap->flags; |
| 673 | |
| 674 | if (psb->state_flags & POHMELFS_FLAGS_RO) { |
| 675 | psb->sb->s_flags |= MS_RDONLY; |
| 676 | printk(KERN_INFO "Mounting POHMELFS (%d) read-only.\n", psb->idx); |
| 677 | } |
| 678 | |
| 679 | if (psb->state_flags & POHMELFS_FLAGS_XATTR) |
| 680 | printk(KERN_INFO "Mounting POHMELFS (%d) " |
| 681 | "with extended attributes support.\n", psb->idx); |
| 682 | |
Alan Cox | 76efa5e | 2009-08-19 17:52:02 +0100 | [diff] [blame] | 683 | if (atomic_long_read(&psb->total_inodes) <= 1) |
Evgeniy Polyakov | d35eef1 | 2009-02-09 17:02:40 +0300 | [diff] [blame] | 684 | atomic_long_set(&psb->total_inodes, cap->nr_files); |
| 685 | |
| 686 | dprintk("%s: total: %llu, avail: %llu, flags: %llx, inodes: %llu.\n", |
| 687 | __func__, psb->total_size, psb->avail_size, psb->state_flags, cap->nr_files); |
| 688 | |
| 689 | psb->flags = 0; |
| 690 | wake_up(&psb->wait); |
| 691 | return 0; |
| 692 | } |
| 693 | |
| 694 | /* |
| 695 | * Crypto capabilities of the server, where it says that |
| 696 | * it supports or does not requested hash/cipher algorithms. |
| 697 | */ |
| 698 | static int pohmelfs_crypto_cap_response(struct netfs_state *st) |
| 699 | { |
| 700 | struct netfs_cmd *cmd = &st->cmd; |
| 701 | struct netfs_crypto_capabilities *cap; |
| 702 | struct pohmelfs_sb *psb = st->psb; |
| 703 | int err = 0; |
| 704 | |
| 705 | if (cmd->size != sizeof(struct netfs_crypto_capabilities)) { |
| 706 | psb->flags = EPROTO; |
| 707 | wake_up(&psb->wait); |
| 708 | return -EPROTO; |
| 709 | } |
| 710 | |
| 711 | cap = st->data; |
| 712 | |
| 713 | dprintk("%s: cipher '%s': %s, hash: '%s': %s.\n", |
| 714 | __func__, |
| 715 | psb->cipher_string, (cap->cipher_strlen)?"SUPPORTED":"NOT SUPPORTED", |
| 716 | psb->hash_string, (cap->hash_strlen)?"SUPPORTED":"NOT SUPPORTED"); |
| 717 | |
| 718 | if (!cap->hash_strlen) { |
| 719 | if (psb->hash_strlen && psb->crypto_fail_unsupported) |
| 720 | err = -ENOTSUPP; |
| 721 | psb->hash_strlen = 0; |
| 722 | kfree(psb->hash_string); |
| 723 | psb->hash_string = NULL; |
| 724 | } |
| 725 | |
| 726 | if (!cap->cipher_strlen) { |
| 727 | if (psb->cipher_strlen && psb->crypto_fail_unsupported) |
| 728 | err = -ENOTSUPP; |
| 729 | psb->cipher_strlen = 0; |
| 730 | kfree(psb->cipher_string); |
| 731 | psb->cipher_string = NULL; |
| 732 | } |
| 733 | |
| 734 | return err; |
| 735 | } |
| 736 | |
| 737 | /* |
| 738 | * Capabilities handshake response. |
| 739 | */ |
| 740 | static int pohmelfs_capabilities_response(struct netfs_state *st) |
| 741 | { |
| 742 | struct netfs_cmd *cmd = &st->cmd; |
| 743 | int err = 0; |
| 744 | |
| 745 | err = pohmelfs_data_recv(st, st->data, cmd->size); |
| 746 | if (err) |
| 747 | return err; |
| 748 | |
| 749 | switch (cmd->id) { |
| 750 | case POHMELFS_CRYPTO_CAPABILITIES: |
| 751 | return pohmelfs_crypto_cap_response(st); |
| 752 | case POHMELFS_ROOT_CAPABILITIES: |
| 753 | return pohmelfs_root_cap_response(st); |
| 754 | default: |
| 755 | break; |
| 756 | } |
| 757 | return -EINVAL; |
| 758 | } |
| 759 | |
| 760 | /* |
| 761 | * Receiving extended attribute. |
| 762 | * Does not work properly if received size is more than requested one, |
| 763 | * it should not happen with current request/reply model though. |
| 764 | */ |
| 765 | static int pohmelfs_getxattr_response(struct netfs_state *st) |
| 766 | { |
| 767 | struct pohmelfs_sb *psb = st->psb; |
| 768 | struct netfs_cmd *cmd = &st->cmd; |
| 769 | struct pohmelfs_mcache *m; |
| 770 | short error = (signed short)cmd->ext, err; |
| 771 | unsigned int sz, total_size; |
| 772 | |
| 773 | m = pohmelfs_mcache_search(psb, cmd->id); |
| 774 | |
| 775 | dprintk("%s: id: %llu, gen: %llu, err: %d.\n", |
| 776 | __func__, cmd->id, (m)?m->gen:0, error); |
| 777 | |
| 778 | if (!m) { |
| 779 | printk("%s: failed to find getxattr cache entry: id: %llu.\n", __func__, cmd->id); |
| 780 | return -ENOENT; |
| 781 | } |
| 782 | |
| 783 | if (cmd->size) { |
| 784 | sz = min_t(unsigned int, cmd->size, m->size); |
| 785 | err = pohmelfs_data_recv_and_check(st, m->data, sz); |
| 786 | if (err) { |
| 787 | error = err; |
| 788 | goto out; |
| 789 | } |
| 790 | |
| 791 | m->size = sz; |
| 792 | total_size = cmd->size - sz; |
| 793 | |
| 794 | while (total_size) { |
| 795 | sz = min(total_size, st->size); |
| 796 | |
| 797 | err = pohmelfs_data_recv_and_check(st, st->data, sz); |
| 798 | if (err) { |
| 799 | error = err; |
| 800 | break; |
| 801 | } |
| 802 | |
| 803 | total_size -= sz; |
| 804 | } |
| 805 | } |
| 806 | |
| 807 | out: |
| 808 | m->err = error; |
| 809 | complete(&m->complete); |
| 810 | pohmelfs_mcache_put(psb, m); |
| 811 | |
| 812 | return error; |
| 813 | } |
| 814 | |
| 815 | int pohmelfs_data_lock_response(struct netfs_state *st) |
| 816 | { |
| 817 | struct pohmelfs_sb *psb = st->psb; |
| 818 | struct netfs_cmd *cmd = &st->cmd; |
| 819 | struct pohmelfs_mcache *m; |
| 820 | short err = (signed short)cmd->ext; |
| 821 | u64 id = cmd->id; |
| 822 | |
| 823 | m = pohmelfs_mcache_search(psb, id); |
| 824 | |
| 825 | dprintk("%s: id: %llu, gen: %llu, err: %d.\n", |
| 826 | __func__, cmd->id, (m)?m->gen:0, err); |
| 827 | |
| 828 | if (!m) { |
| 829 | pohmelfs_data_recv(st, st->data, cmd->size); |
| 830 | printk("%s: failed to find data lock response: id: %llu.\n", __func__, cmd->id); |
| 831 | return -ENOENT; |
| 832 | } |
| 833 | |
| 834 | if (cmd->size) |
| 835 | err = pohmelfs_data_recv_and_check(st, &m->info, cmd->size); |
| 836 | |
| 837 | m->err = err; |
| 838 | complete(&m->complete); |
| 839 | pohmelfs_mcache_put(psb, m); |
| 840 | |
| 841 | return err; |
| 842 | } |
| 843 | |
| 844 | static void __inline__ netfs_state_reset(struct netfs_state *st) |
| 845 | { |
| 846 | netfs_state_lock_send(st); |
| 847 | netfs_state_exit(st); |
| 848 | netfs_state_init(st); |
| 849 | netfs_state_unlock_send(st); |
| 850 | } |
| 851 | |
| 852 | /* |
| 853 | * Main receiving function, called from dedicated kernel thread. |
| 854 | */ |
| 855 | static int pohmelfs_recv(void *data) |
| 856 | { |
| 857 | int err = -EINTR; |
| 858 | struct netfs_state *st = data; |
| 859 | struct netfs_cmd *cmd = &st->cmd; |
| 860 | |
| 861 | while (!kthread_should_stop()) { |
| 862 | /* |
| 863 | * If socket will be reset after this statement, then |
| 864 | * pohmelfs_data_recv() will just fail and loop will |
| 865 | * start again, so it can be done without any locks. |
| 866 | * |
| 867 | * st->read_socket is needed to prevents state machine |
| 868 | * breaking between this data reading and subsequent one |
| 869 | * in protocol specific functions during connection reset. |
| 870 | * In case of reset we have to read next command and do |
| 871 | * not expect data for old command to magically appear in |
| 872 | * new connection. |
| 873 | */ |
| 874 | st->read_socket = st->socket; |
| 875 | err = pohmelfs_data_recv(st, cmd, sizeof(struct netfs_cmd)); |
| 876 | if (err) { |
| 877 | msleep(1000); |
| 878 | continue; |
| 879 | } |
| 880 | |
| 881 | netfs_convert_cmd(cmd); |
| 882 | |
| 883 | dprintk("%s: cmd: %u, id: %llu, start: %llu, size: %u, " |
| 884 | "ext: %u, csize: %u, cpad: %u.\n", |
| 885 | __func__, cmd->cmd, cmd->id, cmd->start, |
| 886 | cmd->size, cmd->ext, cmd->csize, cmd->cpad); |
| 887 | |
| 888 | if (cmd->csize) { |
| 889 | struct pohmelfs_crypto_engine *e = &st->eng; |
| 890 | |
| 891 | if (unlikely(cmd->csize > e->size/2)) { |
| 892 | netfs_state_reset(st); |
| 893 | continue; |
| 894 | } |
| 895 | |
| 896 | if (e->hash && unlikely(cmd->csize != st->psb->crypto_attached_size)) { |
| 897 | dprintk("%s: cmd: cmd: %u, id: %llu, start: %llu, size: %u, " |
| 898 | "csize: %u != digest size %u.\n", |
| 899 | __func__, cmd->cmd, cmd->id, cmd->start, cmd->size, |
| 900 | cmd->csize, st->psb->crypto_attached_size); |
| 901 | netfs_state_reset(st); |
| 902 | continue; |
| 903 | } |
| 904 | |
| 905 | err = pohmelfs_data_recv(st, e->data, cmd->csize); |
| 906 | if (err) { |
| 907 | netfs_state_reset(st); |
| 908 | continue; |
| 909 | } |
| 910 | |
| 911 | #ifdef CONFIG_POHMELFS_DEBUG |
| 912 | { |
| 913 | unsigned int i; |
| 914 | unsigned char *hash = e->data; |
| 915 | |
| 916 | dprintk("%s: received hash: ", __func__); |
Bill Pemberton | dc82846 | 2009-04-22 08:59:15 -0400 | [diff] [blame] | 917 | for (i=0; i<cmd->csize; ++i) |
Evgeniy Polyakov | d35eef1 | 2009-02-09 17:02:40 +0300 | [diff] [blame] | 918 | printk("%02x ", hash[i]); |
Bill Pemberton | dc82846 | 2009-04-22 08:59:15 -0400 | [diff] [blame] | 919 | |
Evgeniy Polyakov | d35eef1 | 2009-02-09 17:02:40 +0300 | [diff] [blame] | 920 | printk("\n"); |
| 921 | } |
| 922 | #endif |
| 923 | cmd->size -= cmd->csize; |
| 924 | } |
| 925 | |
| 926 | /* |
| 927 | * This should catch protocol breakage and random garbage instead of commands. |
| 928 | */ |
| 929 | if (unlikely((cmd->size > st->size) && (cmd->cmd != NETFS_XATTR_GET))) { |
| 930 | netfs_state_reset(st); |
| 931 | continue; |
| 932 | } |
| 933 | |
| 934 | switch (cmd->cmd) { |
| 935 | case NETFS_READ_PAGE: |
| 936 | err = pohmelfs_read_page_response(st); |
| 937 | break; |
| 938 | case NETFS_READDIR: |
| 939 | err = pohmelfs_readdir_response(st); |
| 940 | break; |
| 941 | case NETFS_LOOKUP: |
| 942 | err = pohmelfs_lookup_response(st); |
| 943 | break; |
| 944 | case NETFS_CREATE: |
| 945 | err = pohmelfs_create_response(st); |
| 946 | break; |
| 947 | case NETFS_REMOVE: |
| 948 | err = pohmelfs_remove_response(st); |
| 949 | break; |
| 950 | case NETFS_TRANS: |
| 951 | err = pohmelfs_transaction_response(st); |
| 952 | break; |
| 953 | case NETFS_PAGE_CACHE: |
| 954 | err = pohmelfs_page_cache_response(st); |
| 955 | break; |
| 956 | case NETFS_CAPABILITIES: |
| 957 | err = pohmelfs_capabilities_response(st); |
| 958 | break; |
| 959 | case NETFS_LOCK: |
| 960 | err = pohmelfs_data_lock_response(st); |
| 961 | break; |
| 962 | case NETFS_XATTR_GET: |
| 963 | err = pohmelfs_getxattr_response(st); |
| 964 | break; |
| 965 | default: |
| 966 | printk("%s: wrong cmd: %u, id: %llu, start: %llu, size: %u, ext: %u.\n", |
| 967 | __func__, cmd->cmd, cmd->id, cmd->start, cmd->size, cmd->ext); |
| 968 | netfs_state_reset(st); |
| 969 | break; |
| 970 | } |
| 971 | } |
| 972 | |
| 973 | while (!kthread_should_stop()) |
| 974 | schedule_timeout_uninterruptible(msecs_to_jiffies(10)); |
| 975 | |
| 976 | return err; |
| 977 | } |
| 978 | |
| 979 | int netfs_state_init(struct netfs_state *st) |
| 980 | { |
| 981 | int err; |
| 982 | struct pohmelfs_ctl *ctl = &st->ctl; |
| 983 | |
| 984 | err = sock_create(ctl->addr.sa_family, ctl->type, ctl->proto, &st->socket); |
| 985 | if (err) { |
| 986 | printk("%s: failed to create a socket: family: %d, type: %d, proto: %d, err: %d.\n", |
| 987 | __func__, ctl->addr.sa_family, ctl->type, ctl->proto, err); |
| 988 | goto err_out_exit; |
| 989 | } |
| 990 | |
| 991 | st->socket->sk->sk_allocation = GFP_NOIO; |
| 992 | st->socket->sk->sk_sndtimeo = st->socket->sk->sk_rcvtimeo = msecs_to_jiffies(60000); |
| 993 | |
| 994 | err = kernel_connect(st->socket, (struct sockaddr *)&ctl->addr, ctl->addrlen, 0); |
| 995 | if (err) { |
| 996 | printk("%s: failed to connect to server: idx: %u, err: %d.\n", |
| 997 | __func__, st->psb->idx, err); |
| 998 | goto err_out_release; |
| 999 | } |
| 1000 | st->socket->sk->sk_sndtimeo = st->socket->sk->sk_rcvtimeo = msecs_to_jiffies(60000); |
| 1001 | |
| 1002 | err = netfs_poll_init(st); |
| 1003 | if (err) |
| 1004 | goto err_out_release; |
| 1005 | |
| 1006 | if (st->socket->ops->family == AF_INET) { |
| 1007 | struct sockaddr_in *sin = (struct sockaddr_in *)&ctl->addr; |
Evgeniy Polyakov | 2d7cf8e | 2009-08-28 17:57:58 +0400 | [diff] [blame] | 1008 | printk(KERN_INFO "%s: (re)connected to peer %pi4:%d.\n", __func__, |
| 1009 | &sin->sin_addr.s_addr, ntohs(sin->sin_port)); |
Evgeniy Polyakov | d35eef1 | 2009-02-09 17:02:40 +0300 | [diff] [blame] | 1010 | } else if (st->socket->ops->family == AF_INET6) { |
| 1011 | struct sockaddr_in6 *sin = (struct sockaddr_in6 *)&ctl->addr; |
Evgeniy Polyakov | 2d7cf8e | 2009-08-28 17:57:58 +0400 | [diff] [blame] | 1012 | printk(KERN_INFO "%s: (re)connected to peer %pi6:%d", __func__, |
| 1013 | &sin->sin6_addr, ntohs(sin->sin6_port)); |
Evgeniy Polyakov | d35eef1 | 2009-02-09 17:02:40 +0300 | [diff] [blame] | 1014 | } |
| 1015 | |
| 1016 | return 0; |
| 1017 | |
| 1018 | err_out_release: |
| 1019 | sock_release(st->socket); |
| 1020 | err_out_exit: |
| 1021 | st->socket = NULL; |
| 1022 | return err; |
| 1023 | } |
| 1024 | |
| 1025 | void netfs_state_exit(struct netfs_state *st) |
| 1026 | { |
| 1027 | if (st->socket) { |
| 1028 | netfs_poll_exit(st); |
| 1029 | st->socket->ops->shutdown(st->socket, 2); |
| 1030 | |
| 1031 | if (st->socket->ops->family == AF_INET) { |
| 1032 | struct sockaddr_in *sin = (struct sockaddr_in *)&st->ctl.addr; |
Evgeniy Polyakov | 2d7cf8e | 2009-08-28 17:57:58 +0400 | [diff] [blame] | 1033 | printk(KERN_INFO "%s: disconnected from peer %pi4:%d.\n", __func__, |
| 1034 | &sin->sin_addr.s_addr, ntohs(sin->sin_port)); |
Evgeniy Polyakov | d35eef1 | 2009-02-09 17:02:40 +0300 | [diff] [blame] | 1035 | } else if (st->socket->ops->family == AF_INET6) { |
| 1036 | struct sockaddr_in6 *sin = (struct sockaddr_in6 *)&st->ctl.addr; |
Evgeniy Polyakov | 2d7cf8e | 2009-08-28 17:57:58 +0400 | [diff] [blame] | 1037 | printk(KERN_INFO "%s: disconnected from peer %pi6:%d", __func__, |
| 1038 | &sin->sin6_addr, ntohs(sin->sin6_port)); |
Evgeniy Polyakov | d35eef1 | 2009-02-09 17:02:40 +0300 | [diff] [blame] | 1039 | } |
| 1040 | |
| 1041 | sock_release(st->socket); |
| 1042 | st->socket = NULL; |
| 1043 | st->read_socket = NULL; |
| 1044 | st->need_reset = 0; |
| 1045 | } |
| 1046 | } |
| 1047 | |
| 1048 | int pohmelfs_state_init_one(struct pohmelfs_sb *psb, struct pohmelfs_config *conf) |
| 1049 | { |
| 1050 | struct netfs_state *st = &conf->state; |
| 1051 | int err = -ENOMEM; |
| 1052 | |
| 1053 | mutex_init(&st->__state_lock); |
| 1054 | mutex_init(&st->__state_send_lock); |
| 1055 | init_waitqueue_head(&st->thread_wait); |
| 1056 | |
| 1057 | st->psb = psb; |
| 1058 | st->trans_root = RB_ROOT; |
| 1059 | mutex_init(&st->trans_lock); |
| 1060 | |
| 1061 | st->size = psb->trans_data_size; |
| 1062 | st->data = kmalloc(st->size, GFP_KERNEL); |
| 1063 | if (!st->data) |
| 1064 | goto err_out_exit; |
| 1065 | |
| 1066 | if (psb->perform_crypto) { |
| 1067 | err = pohmelfs_crypto_engine_init(&st->eng, psb); |
| 1068 | if (err) |
| 1069 | goto err_out_free_data; |
| 1070 | } |
| 1071 | |
| 1072 | err = netfs_state_init(st); |
| 1073 | if (err) |
| 1074 | goto err_out_free_engine; |
| 1075 | |
| 1076 | st->thread = kthread_run(pohmelfs_recv, st, "pohmelfs/%u", psb->idx); |
| 1077 | if (IS_ERR(st->thread)) { |
| 1078 | err = PTR_ERR(st->thread); |
| 1079 | goto err_out_netfs_exit; |
| 1080 | } |
| 1081 | |
| 1082 | if (!psb->active_state) |
| 1083 | psb->active_state = conf; |
| 1084 | |
| 1085 | dprintk("%s: conf: %p, st: %p, socket: %p.\n", |
| 1086 | __func__, conf, st, st->socket); |
| 1087 | return 0; |
| 1088 | |
| 1089 | err_out_netfs_exit: |
| 1090 | netfs_state_exit(st); |
| 1091 | err_out_free_engine: |
| 1092 | pohmelfs_crypto_engine_exit(&st->eng); |
| 1093 | err_out_free_data: |
| 1094 | kfree(st->data); |
| 1095 | err_out_exit: |
| 1096 | return err; |
| 1097 | |
| 1098 | } |
| 1099 | |
| 1100 | void pohmelfs_state_flush_transactions(struct netfs_state *st) |
| 1101 | { |
| 1102 | struct rb_node *rb_node; |
| 1103 | struct netfs_trans_dst *dst; |
| 1104 | |
| 1105 | mutex_lock(&st->trans_lock); |
| 1106 | for (rb_node = rb_first(&st->trans_root); rb_node; ) { |
| 1107 | dst = rb_entry(rb_node, struct netfs_trans_dst, state_entry); |
| 1108 | rb_node = rb_next(rb_node); |
| 1109 | |
| 1110 | dst->trans->result = -EINVAL; |
| 1111 | netfs_trans_remove_nolock(dst, st); |
| 1112 | netfs_trans_drop_dst_nostate(dst); |
| 1113 | } |
| 1114 | mutex_unlock(&st->trans_lock); |
| 1115 | } |
| 1116 | |
| 1117 | static void pohmelfs_state_exit_one(struct pohmelfs_config *c) |
| 1118 | { |
| 1119 | struct netfs_state *st = &c->state; |
| 1120 | |
| 1121 | dprintk("%s: exiting, st: %p.\n", __func__, st); |
| 1122 | if (st->thread) { |
| 1123 | kthread_stop(st->thread); |
| 1124 | st->thread = NULL; |
| 1125 | } |
| 1126 | |
| 1127 | netfs_state_lock_send(st); |
| 1128 | netfs_state_exit(st); |
| 1129 | netfs_state_unlock_send(st); |
| 1130 | |
| 1131 | pohmelfs_state_flush_transactions(st); |
| 1132 | |
| 1133 | pohmelfs_crypto_engine_exit(&st->eng); |
| 1134 | kfree(st->data); |
| 1135 | |
| 1136 | kfree(c); |
| 1137 | } |
| 1138 | |
| 1139 | /* |
| 1140 | * Initialize network stack. It searches for given ID in global |
| 1141 | * configuration table, this contains information of the remote server |
| 1142 | * (address (any supported by socket interface) and port, protocol and so on). |
| 1143 | */ |
| 1144 | int pohmelfs_state_init(struct pohmelfs_sb *psb) |
| 1145 | { |
| 1146 | int err = -ENOMEM; |
| 1147 | |
| 1148 | err = pohmelfs_copy_config(psb); |
| 1149 | if (err) { |
| 1150 | pohmelfs_state_exit(psb); |
| 1151 | return err; |
| 1152 | } |
| 1153 | |
| 1154 | return 0; |
| 1155 | } |
| 1156 | |
| 1157 | void pohmelfs_state_exit(struct pohmelfs_sb *psb) |
| 1158 | { |
| 1159 | struct pohmelfs_config *c, *tmp; |
| 1160 | |
| 1161 | list_for_each_entry_safe(c, tmp, &psb->state_list, config_entry) { |
| 1162 | list_del(&c->config_entry); |
| 1163 | pohmelfs_state_exit_one(c); |
| 1164 | } |
| 1165 | } |
| 1166 | |
| 1167 | void pohmelfs_switch_active(struct pohmelfs_sb *psb) |
| 1168 | { |
| 1169 | struct pohmelfs_config *c = psb->active_state; |
| 1170 | |
| 1171 | if (!list_empty(&psb->state_list)) { |
| 1172 | if (c->config_entry.next != &psb->state_list) { |
| 1173 | psb->active_state = list_entry(c->config_entry.next, |
| 1174 | struct pohmelfs_config, config_entry); |
| 1175 | } else { |
| 1176 | psb->active_state = list_entry(psb->state_list.next, |
| 1177 | struct pohmelfs_config, config_entry); |
| 1178 | } |
| 1179 | |
| 1180 | dprintk("%s: empty: %d, active %p -> %p.\n", |
| 1181 | __func__, list_empty(&psb->state_list), c, |
| 1182 | psb->active_state); |
| 1183 | } else |
| 1184 | psb->active_state = NULL; |
| 1185 | } |
| 1186 | |
| 1187 | void pohmelfs_check_states(struct pohmelfs_sb *psb) |
| 1188 | { |
| 1189 | struct pohmelfs_config *c, *tmp; |
| 1190 | LIST_HEAD(delete_list); |
| 1191 | |
| 1192 | mutex_lock(&psb->state_lock); |
| 1193 | list_for_each_entry_safe(c, tmp, &psb->state_list, config_entry) { |
| 1194 | if (pohmelfs_config_check(c, psb->idx)) { |
| 1195 | |
| 1196 | if (psb->active_state == c) |
| 1197 | pohmelfs_switch_active(psb); |
| 1198 | list_move(&c->config_entry, &delete_list); |
| 1199 | } |
| 1200 | } |
| 1201 | pohmelfs_copy_config(psb); |
| 1202 | mutex_unlock(&psb->state_lock); |
| 1203 | |
| 1204 | list_for_each_entry_safe(c, tmp, &delete_list, config_entry) { |
| 1205 | list_del(&c->config_entry); |
| 1206 | pohmelfs_state_exit_one(c); |
| 1207 | } |
| 1208 | } |