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 | |
| 29 | static int pohmelfs_ftrans_size = 10240; |
| 30 | static u32 *pohmelfs_ftrans; |
| 31 | |
| 32 | int pohmelfs_ftrans_init(void) |
| 33 | { |
| 34 | pohmelfs_ftrans = vmalloc(pohmelfs_ftrans_size * 4); |
| 35 | if (!pohmelfs_ftrans) |
| 36 | return -ENOMEM; |
| 37 | |
| 38 | return 0; |
| 39 | } |
| 40 | |
| 41 | void pohmelfs_ftrans_exit(void) |
| 42 | { |
| 43 | vfree(pohmelfs_ftrans); |
| 44 | } |
| 45 | |
| 46 | void pohmelfs_ftrans_clean(u64 id) |
| 47 | { |
| 48 | if (pohmelfs_ftrans) { |
| 49 | u32 i = id & 0xffffffff; |
| 50 | int idx = i % pohmelfs_ftrans_size; |
| 51 | |
| 52 | pohmelfs_ftrans[idx] = 0; |
| 53 | } |
| 54 | } |
| 55 | |
| 56 | void pohmelfs_ftrans_update(u64 id) |
| 57 | { |
| 58 | if (pohmelfs_ftrans) { |
| 59 | u32 i = id & 0xffffffff; |
| 60 | int idx = i % pohmelfs_ftrans_size; |
| 61 | |
| 62 | pohmelfs_ftrans[idx] = i; |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | int pohmelfs_ftrans_check(u64 id) |
| 67 | { |
| 68 | if (pohmelfs_ftrans) { |
| 69 | u32 i = id & 0xffffffff; |
| 70 | int idx = i % pohmelfs_ftrans_size; |
| 71 | |
| 72 | return (pohmelfs_ftrans[idx] == i); |
| 73 | } |
| 74 | |
| 75 | return -1; |
| 76 | } |
| 77 | |
| 78 | /* |
| 79 | * Async machinery lives here. |
| 80 | * All commands being sent to server do _not_ require sync reply, |
| 81 | * instead, if it is really needed, like readdir or readpage, caller |
| 82 | * sleeps waiting for data, which will be placed into provided buffer |
| 83 | * and caller will be awakened. |
| 84 | * |
| 85 | * Every command response can come without some listener. For example |
| 86 | * readdir response will add new objects into cache without appropriate |
| 87 | * request from userspace. This is used in cache coherency. |
| 88 | * |
| 89 | * If object is not found for given data, it is discarded. |
| 90 | * |
| 91 | * All requests are received by dedicated kernel thread. |
| 92 | */ |
| 93 | |
| 94 | /* |
| 95 | * Basic network sending/receiving functions. |
| 96 | * Blocked mode is used. |
| 97 | */ |
| 98 | static int netfs_data_recv(struct netfs_state *st, void *buf, u64 size) |
| 99 | { |
| 100 | struct msghdr msg; |
| 101 | struct kvec iov; |
| 102 | int err; |
| 103 | |
| 104 | BUG_ON(!size); |
| 105 | |
| 106 | iov.iov_base = buf; |
| 107 | iov.iov_len = size; |
| 108 | |
| 109 | msg.msg_iov = (struct iovec *)&iov; |
| 110 | msg.msg_iovlen = 1; |
| 111 | msg.msg_name = NULL; |
| 112 | msg.msg_namelen = 0; |
| 113 | msg.msg_control = NULL; |
| 114 | msg.msg_controllen = 0; |
| 115 | msg.msg_flags = MSG_DONTWAIT; |
| 116 | |
| 117 | err = kernel_recvmsg(st->socket, &msg, &iov, 1, iov.iov_len, |
| 118 | msg.msg_flags); |
| 119 | if (err <= 0) { |
| 120 | printk("%s: failed to recv data: size: %llu, err: %d.\n", __func__, size, err); |
| 121 | if (err == 0) |
| 122 | err = -ECONNRESET; |
| 123 | } |
| 124 | |
| 125 | return err; |
| 126 | } |
| 127 | |
| 128 | static int pohmelfs_data_recv(struct netfs_state *st, void *data, unsigned int size) |
| 129 | { |
| 130 | unsigned int revents = 0; |
| 131 | unsigned int err_mask = POLLERR | POLLHUP | POLLRDHUP; |
| 132 | unsigned int mask = err_mask | POLLIN; |
| 133 | int err = 0; |
| 134 | |
| 135 | while (size && !err) { |
| 136 | revents = netfs_state_poll(st); |
| 137 | |
| 138 | if (!(revents & mask)) { |
| 139 | DEFINE_WAIT(wait); |
| 140 | |
| 141 | for (;;) { |
| 142 | prepare_to_wait(&st->thread_wait, &wait, TASK_INTERRUPTIBLE); |
| 143 | if (kthread_should_stop()) |
| 144 | break; |
| 145 | |
| 146 | revents = netfs_state_poll(st); |
| 147 | |
| 148 | if (revents & mask) |
| 149 | break; |
| 150 | |
| 151 | if (signal_pending(current)) |
| 152 | break; |
| 153 | |
| 154 | schedule(); |
| 155 | continue; |
| 156 | } |
| 157 | finish_wait(&st->thread_wait, &wait); |
| 158 | } |
| 159 | |
| 160 | err = 0; |
| 161 | netfs_state_lock(st); |
| 162 | if (st->socket && (st->read_socket == st->socket) && (revents & POLLIN)) { |
| 163 | err = netfs_data_recv(st, data, size); |
| 164 | if (err > 0) { |
| 165 | data += err; |
| 166 | size -= err; |
| 167 | err = 0; |
| 168 | } else if (err == 0) |
| 169 | err = -ECONNRESET; |
| 170 | } |
| 171 | |
| 172 | if (revents & err_mask) { |
| 173 | printk("%s: revents: %x, socket: %p, size: %u, err: %d.\n", |
| 174 | __func__, revents, st->socket, size, err); |
| 175 | err = -ECONNRESET; |
| 176 | } |
| 177 | netfs_state_unlock(st); |
| 178 | |
| 179 | if (err < 0) { |
| 180 | if (netfs_state_trylock_send(st)) { |
| 181 | netfs_state_exit(st); |
| 182 | err = netfs_state_init(st); |
| 183 | if (!err) |
| 184 | err = -EAGAIN; |
| 185 | netfs_state_unlock_send(st); |
| 186 | } else { |
| 187 | st->need_reset = 1; |
| 188 | } |
| 189 | } |
| 190 | |
| 191 | if (kthread_should_stop()) |
| 192 | err = -ENODEV; |
| 193 | |
| 194 | if (err) |
| 195 | printk("%s: socket: %p, read_socket: %p, revents: %x, rev_error: %d, " |
| 196 | "should_stop: %d, size: %u, err: %d.\n", |
| 197 | __func__, st->socket, st->read_socket, |
| 198 | revents, revents & err_mask, kthread_should_stop(), size, err); |
| 199 | } |
| 200 | |
| 201 | return err; |
| 202 | } |
| 203 | |
| 204 | int pohmelfs_data_recv_and_check(struct netfs_state *st, void *data, unsigned int size) |
| 205 | { |
| 206 | struct netfs_cmd *cmd = &st->cmd; |
| 207 | int err; |
| 208 | |
| 209 | err = pohmelfs_data_recv(st, data, size); |
| 210 | if (err) |
| 211 | return err; |
| 212 | |
| 213 | return pohmelfs_crypto_process_input_data(&st->eng, cmd->iv, data, NULL, size); |
| 214 | } |
| 215 | |
| 216 | /* |
| 217 | * Polling machinery. |
| 218 | */ |
| 219 | |
| 220 | struct netfs_poll_helper |
| 221 | { |
| 222 | poll_table pt; |
| 223 | struct netfs_state *st; |
| 224 | }; |
| 225 | |
| 226 | static int netfs_queue_wake(wait_queue_t *wait, unsigned mode, int sync, void *key) |
| 227 | { |
| 228 | struct netfs_state *st = container_of(wait, struct netfs_state, wait); |
| 229 | |
| 230 | wake_up(&st->thread_wait); |
| 231 | return 1; |
| 232 | } |
| 233 | |
| 234 | static void netfs_queue_func(struct file *file, wait_queue_head_t *whead, |
| 235 | poll_table *pt) |
| 236 | { |
| 237 | struct netfs_state *st = container_of(pt, struct netfs_poll_helper, pt)->st; |
| 238 | |
| 239 | st->whead = whead; |
| 240 | init_waitqueue_func_entry(&st->wait, netfs_queue_wake); |
| 241 | add_wait_queue(whead, &st->wait); |
| 242 | } |
| 243 | |
| 244 | static void netfs_poll_exit(struct netfs_state *st) |
| 245 | { |
| 246 | if (st->whead) { |
| 247 | remove_wait_queue(st->whead, &st->wait); |
| 248 | st->whead = NULL; |
| 249 | } |
| 250 | } |
| 251 | |
| 252 | static int netfs_poll_init(struct netfs_state *st) |
| 253 | { |
| 254 | struct netfs_poll_helper ph; |
| 255 | |
| 256 | ph.st = st; |
| 257 | init_poll_funcptr(&ph.pt, &netfs_queue_func); |
| 258 | |
| 259 | st->socket->ops->poll(NULL, st->socket, &ph.pt); |
| 260 | return 0; |
| 261 | } |
| 262 | |
| 263 | /* |
| 264 | * Get response for readpage command. We search inode and page in its mapping |
| 265 | * and copy data into. If it was async request, then we queue page into shared |
| 266 | * data and wakeup listener, who will copy it to userspace. |
| 267 | * |
| 268 | * There is a work in progress of allowing to call copy_to_user() directly from |
| 269 | * async receiving kernel thread. |
| 270 | */ |
| 271 | static int pohmelfs_read_page_response(struct netfs_state *st) |
| 272 | { |
| 273 | struct pohmelfs_sb *psb = st->psb; |
| 274 | struct netfs_cmd *cmd = &st->cmd; |
| 275 | struct inode *inode; |
| 276 | struct page *page; |
| 277 | int err = 0; |
| 278 | |
| 279 | if (cmd->size > PAGE_CACHE_SIZE) { |
| 280 | err = -EINVAL; |
| 281 | goto err_out_exit; |
| 282 | } |
| 283 | |
| 284 | inode = ilookup(st->psb->sb, cmd->id); |
| 285 | if (!inode) { |
| 286 | printk("%s: failed to find inode: id: %llu.\n", __func__, cmd->id); |
| 287 | err = -ENOENT; |
| 288 | goto err_out_exit; |
| 289 | } |
| 290 | |
| 291 | page = find_get_page(inode->i_mapping, cmd->start >> PAGE_CACHE_SHIFT); |
| 292 | if (!page || !PageLocked(page)) { |
| 293 | printk("%s: failed to find/lock page: page: %p, id: %llu, start: %llu, index: %llu.\n", |
| 294 | __func__, page, cmd->id, cmd->start, cmd->start >> PAGE_CACHE_SHIFT); |
| 295 | |
| 296 | while (cmd->size) { |
| 297 | unsigned int sz = min(cmd->size, st->size); |
| 298 | |
| 299 | err = pohmelfs_data_recv(st, st->data, sz); |
| 300 | if (err) |
| 301 | break; |
| 302 | |
| 303 | cmd->size -= sz; |
| 304 | } |
| 305 | |
| 306 | err = -ENODEV; |
| 307 | if (page) |
| 308 | goto err_out_page_put; |
| 309 | goto err_out_put; |
| 310 | } |
| 311 | |
| 312 | if (cmd->size) { |
| 313 | void *addr; |
| 314 | |
| 315 | addr = kmap(page); |
| 316 | err = pohmelfs_data_recv(st, addr, cmd->size); |
| 317 | kunmap(page); |
| 318 | |
| 319 | if (err) |
| 320 | goto err_out_page_unlock; |
| 321 | } |
| 322 | |
| 323 | dprintk("%s: page: %p, start: %llu, size: %u, locked: %d.\n", |
| 324 | __func__, page, cmd->start, cmd->size, PageLocked(page)); |
| 325 | |
| 326 | SetPageChecked(page); |
| 327 | if ((psb->hash_string || psb->cipher_string) && psb->perform_crypto && cmd->size) { |
| 328 | err = pohmelfs_crypto_process_input_page(&st->eng, page, cmd->size, cmd->iv); |
| 329 | if (err < 0) |
| 330 | goto err_out_page_unlock; |
| 331 | } else { |
| 332 | SetPageUptodate(page); |
| 333 | unlock_page(page); |
| 334 | page_cache_release(page); |
| 335 | } |
| 336 | |
| 337 | pohmelfs_put_inode(POHMELFS_I(inode)); |
| 338 | wake_up(&st->psb->wait); |
| 339 | |
| 340 | return 0; |
| 341 | |
| 342 | err_out_page_unlock: |
| 343 | SetPageError(page); |
| 344 | unlock_page(page); |
| 345 | err_out_page_put: |
| 346 | page_cache_release(page); |
| 347 | err_out_put: |
| 348 | pohmelfs_put_inode(POHMELFS_I(inode)); |
| 349 | err_out_exit: |
| 350 | wake_up(&st->psb->wait); |
| 351 | return err; |
| 352 | } |
| 353 | |
| 354 | static int pohmelfs_check_name(struct pohmelfs_inode *parent, struct qstr *str, |
| 355 | struct netfs_inode_info *info) |
| 356 | { |
| 357 | struct inode *inode; |
| 358 | struct pohmelfs_name *n; |
| 359 | int err = 0; |
| 360 | u64 ino = 0; |
| 361 | |
| 362 | mutex_lock(&parent->offset_lock); |
| 363 | n = pohmelfs_search_hash(parent, str->hash); |
| 364 | if (n) |
| 365 | ino = n->ino; |
| 366 | mutex_unlock(&parent->offset_lock); |
| 367 | |
| 368 | if (!ino) |
| 369 | goto out; |
| 370 | |
| 371 | inode = ilookup(parent->vfs_inode.i_sb, ino); |
| 372 | if (!inode) |
| 373 | goto out; |
| 374 | |
| 375 | dprintk("%s: parent: %llu, inode: %llu.\n", __func__, parent->ino, ino); |
| 376 | |
| 377 | pohmelfs_fill_inode(inode, info); |
| 378 | pohmelfs_put_inode(POHMELFS_I(inode)); |
| 379 | err = -EEXIST; |
| 380 | out: |
| 381 | return err; |
| 382 | } |
| 383 | |
| 384 | /* |
| 385 | * Readdir response from server. If special field is set, we wakeup |
| 386 | * listener (readdir() call), which will copy data to userspace. |
| 387 | */ |
| 388 | static int pohmelfs_readdir_response(struct netfs_state *st) |
| 389 | { |
| 390 | struct inode *inode; |
| 391 | struct netfs_cmd *cmd = &st->cmd; |
| 392 | struct netfs_inode_info *info; |
| 393 | struct pohmelfs_inode *parent = NULL, *npi; |
| 394 | int err = 0, last = cmd->ext; |
| 395 | struct qstr str; |
| 396 | |
| 397 | if (cmd->size > st->size) |
| 398 | return -EINVAL; |
| 399 | |
| 400 | inode = ilookup(st->psb->sb, cmd->id); |
| 401 | if (!inode) { |
| 402 | printk("%s: failed to find inode: id: %llu.\n", __func__, cmd->id); |
| 403 | return -ENOENT; |
| 404 | } |
| 405 | parent = POHMELFS_I(inode); |
| 406 | |
| 407 | if (!cmd->size && cmd->start) { |
| 408 | err = -cmd->start; |
| 409 | goto out; |
| 410 | } |
| 411 | |
| 412 | if (cmd->size) { |
| 413 | char *name; |
| 414 | |
| 415 | err = pohmelfs_data_recv_and_check(st, st->data, cmd->size); |
| 416 | if (err) |
| 417 | goto err_out_put; |
| 418 | |
| 419 | info = (struct netfs_inode_info *)(st->data); |
| 420 | |
| 421 | name = (char *)(info + 1); |
| 422 | str.len = cmd->size - sizeof(struct netfs_inode_info) - 1 - cmd->cpad; |
| 423 | name[str.len] = 0; |
| 424 | str.name = name; |
| 425 | str.hash = jhash(str.name, str.len, 0); |
| 426 | |
| 427 | netfs_convert_inode_info(info); |
| 428 | |
| 429 | if (parent) { |
| 430 | err = pohmelfs_check_name(parent, &str, info); |
| 431 | if (err) { |
| 432 | if (err == -EEXIST) |
| 433 | err = 0; |
| 434 | goto out; |
| 435 | } |
| 436 | } |
| 437 | |
| 438 | info->ino = cmd->start; |
| 439 | if (!info->ino) |
| 440 | info->ino = pohmelfs_new_ino(st->psb); |
| 441 | |
| 442 | dprintk("%s: parent: %llu, ino: %llu, name: '%s', hash: %x, len: %u, mode: %o.\n", |
| 443 | __func__, parent->ino, info->ino, str.name, str.hash, str.len, |
| 444 | info->mode); |
| 445 | |
| 446 | npi = pohmelfs_new_inode(st->psb, parent, &str, info, 0); |
| 447 | if (IS_ERR(npi)) { |
| 448 | err = PTR_ERR(npi); |
| 449 | |
| 450 | if (err != -EEXIST) |
| 451 | goto err_out_put; |
| 452 | } else { |
Evgeniy Polyakov | 288a9a8 | 2009-03-27 15:04:18 +0300 | [diff] [blame^] | 453 | struct dentry *dentry, *alias, *pd; |
| 454 | |
Evgeniy Polyakov | d35eef1 | 2009-02-09 17:02:40 +0300 | [diff] [blame] | 455 | set_bit(NETFS_INODE_REMOTE_SYNCED, &npi->state); |
| 456 | clear_bit(NETFS_INODE_OWNED, &npi->state); |
Evgeniy Polyakov | 288a9a8 | 2009-03-27 15:04:18 +0300 | [diff] [blame^] | 457 | |
| 458 | pd = d_find_alias(&parent->vfs_inode); |
| 459 | if (pd) { |
| 460 | str.hash = full_name_hash(str.name, str.len); |
| 461 | dentry = d_alloc(pd, &str); |
| 462 | if (dentry) { |
| 463 | alias = d_materialise_unique(dentry, &npi->vfs_inode); |
| 464 | if (alias) |
| 465 | dput(dentry); |
| 466 | } |
| 467 | |
| 468 | dput(dentry); |
| 469 | dput(pd); |
| 470 | } |
Evgeniy Polyakov | d35eef1 | 2009-02-09 17:02:40 +0300 | [diff] [blame] | 471 | } |
| 472 | } |
| 473 | out: |
| 474 | if (last) { |
| 475 | set_bit(NETFS_INODE_REMOTE_DIR_SYNCED, &parent->state); |
| 476 | set_bit(NETFS_INODE_REMOTE_SYNCED, &parent->state); |
| 477 | wake_up(&st->psb->wait); |
| 478 | } |
| 479 | pohmelfs_put_inode(parent); |
| 480 | |
| 481 | return err; |
| 482 | |
| 483 | err_out_put: |
| 484 | clear_bit(NETFS_INODE_REMOTE_DIR_SYNCED, &parent->state); |
| 485 | printk("%s: parent: %llu, ino: %llu, cmd_id: %llu.\n", __func__, parent->ino, cmd->start, cmd->id); |
| 486 | pohmelfs_put_inode(parent); |
| 487 | wake_up(&st->psb->wait); |
| 488 | return err; |
| 489 | } |
| 490 | |
| 491 | /* |
| 492 | * Lookup command response. |
| 493 | * It searches for inode to be looked at (if it exists) and substitutes |
| 494 | * its inode information (size, permission, mode and so on), if inode does |
| 495 | * not exist, new one will be created and inserted into caches. |
| 496 | */ |
| 497 | static int pohmelfs_lookup_response(struct netfs_state *st) |
| 498 | { |
| 499 | struct inode *inode = NULL; |
| 500 | struct netfs_cmd *cmd = &st->cmd; |
| 501 | struct netfs_inode_info *info; |
| 502 | struct pohmelfs_inode *parent = NULL, *npi; |
| 503 | int err = -EINVAL; |
| 504 | char *name; |
| 505 | |
| 506 | inode = ilookup(st->psb->sb, cmd->id); |
| 507 | if (!inode) { |
| 508 | printk("%s: lookup response: id: %llu, start: %llu, size: %u.\n", |
| 509 | __func__, cmd->id, cmd->start, cmd->size); |
| 510 | err = -ENOENT; |
| 511 | goto err_out_exit; |
| 512 | } |
| 513 | parent = POHMELFS_I(inode); |
| 514 | |
| 515 | if (!cmd->size) { |
| 516 | err = -cmd->start; |
| 517 | goto err_out_put; |
| 518 | } |
| 519 | |
| 520 | if (cmd->size < sizeof(struct netfs_inode_info)) { |
| 521 | printk("%s: broken lookup response: id: %llu, start: %llu, size: %u.\n", |
| 522 | __func__, cmd->id, cmd->start, cmd->size); |
| 523 | err = -EINVAL; |
| 524 | goto err_out_put; |
| 525 | } |
| 526 | |
| 527 | err = pohmelfs_data_recv_and_check(st, st->data, cmd->size); |
| 528 | if (err) |
| 529 | goto err_out_put; |
| 530 | |
| 531 | info = (struct netfs_inode_info *)(st->data); |
| 532 | name = (char *)(info + 1); |
| 533 | |
| 534 | netfs_convert_inode_info(info); |
| 535 | |
| 536 | info->ino = cmd->start; |
| 537 | if (!info->ino) |
| 538 | info->ino = pohmelfs_new_ino(st->psb); |
| 539 | |
| 540 | dprintk("%s: parent: %llu, ino: %llu, name: '%s', start: %llu.\n", |
| 541 | __func__, parent->ino, info->ino, name, cmd->start); |
| 542 | |
| 543 | if (cmd->start) |
| 544 | npi = pohmelfs_new_inode(st->psb, parent, NULL, info, 0); |
| 545 | else { |
| 546 | struct qstr str; |
| 547 | |
| 548 | str.name = name; |
| 549 | str.len = cmd->size - sizeof(struct netfs_inode_info) - 1 - cmd->cpad; |
| 550 | str.hash = jhash(name, str.len, 0); |
| 551 | |
| 552 | npi = pohmelfs_new_inode(st->psb, parent, &str, info, 0); |
| 553 | } |
| 554 | if (IS_ERR(npi)) { |
| 555 | err = PTR_ERR(npi); |
| 556 | |
| 557 | if (err != -EEXIST) |
| 558 | goto err_out_put; |
| 559 | } else { |
| 560 | set_bit(NETFS_INODE_REMOTE_SYNCED, &npi->state); |
| 561 | clear_bit(NETFS_INODE_OWNED, &npi->state); |
| 562 | } |
| 563 | |
| 564 | clear_bit(NETFS_COMMAND_PENDING, &parent->state); |
| 565 | pohmelfs_put_inode(parent); |
| 566 | |
| 567 | wake_up(&st->psb->wait); |
| 568 | |
| 569 | return 0; |
| 570 | |
| 571 | err_out_put: |
| 572 | pohmelfs_put_inode(parent); |
| 573 | err_out_exit: |
| 574 | clear_bit(NETFS_COMMAND_PENDING, &parent->state); |
| 575 | wake_up(&st->psb->wait); |
| 576 | printk("%s: inode: %p, id: %llu, start: %llu, size: %u, err: %d.\n", |
| 577 | __func__, inode, cmd->id, cmd->start, cmd->size, err); |
| 578 | return err; |
| 579 | } |
| 580 | |
| 581 | /* |
| 582 | * Create response, just marks local inode as 'created', so that writeback |
| 583 | * for any of its children (or own) would not try to sync it again. |
| 584 | */ |
| 585 | static int pohmelfs_create_response(struct netfs_state *st) |
| 586 | { |
| 587 | struct inode *inode; |
| 588 | struct netfs_cmd *cmd = &st->cmd; |
| 589 | struct pohmelfs_inode *pi; |
| 590 | |
| 591 | inode = ilookup(st->psb->sb, cmd->id); |
| 592 | if (!inode) { |
| 593 | printk("%s: failed to find inode: id: %llu, start: %llu.\n", |
| 594 | __func__, cmd->id, cmd->start); |
| 595 | goto err_out_exit; |
| 596 | } |
| 597 | |
| 598 | pi = POHMELFS_I(inode); |
| 599 | |
| 600 | /* |
| 601 | * To lock or not to lock? |
| 602 | * We actually do not care if it races... |
| 603 | */ |
| 604 | if (cmd->start) |
| 605 | make_bad_inode(inode); |
| 606 | set_bit(NETFS_INODE_REMOTE_SYNCED, &pi->state); |
| 607 | |
| 608 | pohmelfs_put_inode(pi); |
| 609 | |
| 610 | wake_up(&st->psb->wait); |
| 611 | return 0; |
| 612 | |
| 613 | err_out_exit: |
| 614 | wake_up(&st->psb->wait); |
| 615 | return -ENOENT; |
| 616 | } |
| 617 | |
| 618 | /* |
| 619 | * Object remove response. Just says that remove request has been received. |
| 620 | * Used in cache coherency protocol. |
| 621 | */ |
| 622 | static int pohmelfs_remove_response(struct netfs_state *st) |
| 623 | { |
| 624 | struct netfs_cmd *cmd = &st->cmd; |
| 625 | int err; |
| 626 | |
| 627 | err = pohmelfs_data_recv_and_check(st, st->data, cmd->size); |
| 628 | if (err) |
| 629 | return err; |
| 630 | |
| 631 | dprintk("%s: parent: %llu, path: '%s'.\n", __func__, cmd->id, (char *)st->data); |
| 632 | |
| 633 | return 0; |
| 634 | } |
| 635 | |
| 636 | /* |
| 637 | * Transaction reply processing. |
| 638 | * |
| 639 | * Find transaction based on its generation number, bump its reference counter, |
| 640 | * so that none could free it under us, drop from the trees and lists and |
| 641 | * drop reference counter. When it hits zero (when all destinations replied |
| 642 | * and all timeout handled by async scanning code), completion will be called |
| 643 | * and transaction will be freed. |
| 644 | */ |
| 645 | static int pohmelfs_transaction_response(struct netfs_state *st) |
| 646 | { |
| 647 | struct netfs_trans_dst *dst; |
| 648 | struct netfs_trans *t = NULL; |
| 649 | struct netfs_cmd *cmd = &st->cmd; |
| 650 | short err = (signed)cmd->ext; |
| 651 | |
| 652 | mutex_lock(&st->trans_lock); |
| 653 | dst = netfs_trans_search(st, cmd->start); |
| 654 | if (dst) { |
| 655 | netfs_trans_remove_nolock(dst, st); |
| 656 | t = dst->trans; |
| 657 | |
| 658 | pohmelfs_ftrans_update(cmd->start); |
| 659 | } |
| 660 | mutex_unlock(&st->trans_lock); |
| 661 | |
| 662 | if (!t) { |
| 663 | int check = pohmelfs_ftrans_check(cmd->start); |
| 664 | printk("%s: failed to find transaction: start: %llu: id: %llu, size: %u, ext: %u, double: %d.\n", |
| 665 | __func__, cmd->start, cmd->id, cmd->size, cmd->ext, check); |
| 666 | err = -EINVAL; |
| 667 | goto out; |
| 668 | } |
| 669 | |
| 670 | t->result = err; |
| 671 | netfs_trans_drop_dst_nostate(dst); |
| 672 | |
| 673 | out: |
| 674 | wake_up(&st->psb->wait); |
| 675 | return err; |
| 676 | } |
| 677 | |
| 678 | /* |
| 679 | * Inode metadata cache coherency message. |
| 680 | */ |
| 681 | static int pohmelfs_page_cache_response(struct netfs_state *st) |
| 682 | { |
| 683 | struct netfs_cmd *cmd = &st->cmd; |
| 684 | struct inode *inode; |
| 685 | |
| 686 | dprintk("%s: st: %p, id: %llu, start: %llu, size: %u.\n", __func__, st, cmd->id, cmd->start, cmd->size); |
| 687 | |
| 688 | inode = ilookup(st->psb->sb, cmd->id); |
| 689 | if (!inode) { |
| 690 | printk("%s: failed to find inode: id: %llu.\n", __func__, cmd->id); |
| 691 | return -ENOENT; |
| 692 | } |
| 693 | |
| 694 | set_bit(NETFS_INODE_NEED_FLUSH, &POHMELFS_I(inode)->state); |
| 695 | pohmelfs_put_inode(POHMELFS_I(inode)); |
| 696 | |
| 697 | return 0; |
| 698 | } |
| 699 | |
| 700 | /* |
| 701 | * Root capabilities response: export statistics |
| 702 | * like used and available size, number of files and dirs, |
| 703 | * permissions. |
| 704 | */ |
| 705 | static int pohmelfs_root_cap_response(struct netfs_state *st) |
| 706 | { |
| 707 | struct netfs_cmd *cmd = &st->cmd; |
| 708 | struct netfs_root_capabilities *cap; |
| 709 | struct pohmelfs_sb *psb = st->psb; |
| 710 | |
| 711 | if (cmd->size != sizeof(struct netfs_root_capabilities)) { |
| 712 | psb->flags = EPROTO; |
| 713 | wake_up(&psb->wait); |
| 714 | return -EPROTO; |
| 715 | } |
| 716 | |
| 717 | cap = st->data; |
| 718 | |
| 719 | netfs_convert_root_capabilities(cap); |
| 720 | |
| 721 | if (psb->total_size < cap->used + cap->avail) |
| 722 | psb->total_size = cap->used + cap->avail; |
| 723 | if (cap->avail) |
| 724 | psb->avail_size = cap->avail; |
| 725 | psb->state_flags = cap->flags; |
| 726 | |
| 727 | if (psb->state_flags & POHMELFS_FLAGS_RO) { |
| 728 | psb->sb->s_flags |= MS_RDONLY; |
| 729 | printk(KERN_INFO "Mounting POHMELFS (%d) read-only.\n", psb->idx); |
| 730 | } |
| 731 | |
| 732 | if (psb->state_flags & POHMELFS_FLAGS_XATTR) |
| 733 | printk(KERN_INFO "Mounting POHMELFS (%d) " |
| 734 | "with extended attributes support.\n", psb->idx); |
| 735 | |
| 736 | if (atomic_read(&psb->total_inodes) <= 1) |
| 737 | atomic_long_set(&psb->total_inodes, cap->nr_files); |
| 738 | |
| 739 | dprintk("%s: total: %llu, avail: %llu, flags: %llx, inodes: %llu.\n", |
| 740 | __func__, psb->total_size, psb->avail_size, psb->state_flags, cap->nr_files); |
| 741 | |
| 742 | psb->flags = 0; |
| 743 | wake_up(&psb->wait); |
| 744 | return 0; |
| 745 | } |
| 746 | |
| 747 | /* |
| 748 | * Crypto capabilities of the server, where it says that |
| 749 | * it supports or does not requested hash/cipher algorithms. |
| 750 | */ |
| 751 | static int pohmelfs_crypto_cap_response(struct netfs_state *st) |
| 752 | { |
| 753 | struct netfs_cmd *cmd = &st->cmd; |
| 754 | struct netfs_crypto_capabilities *cap; |
| 755 | struct pohmelfs_sb *psb = st->psb; |
| 756 | int err = 0; |
| 757 | |
| 758 | if (cmd->size != sizeof(struct netfs_crypto_capabilities)) { |
| 759 | psb->flags = EPROTO; |
| 760 | wake_up(&psb->wait); |
| 761 | return -EPROTO; |
| 762 | } |
| 763 | |
| 764 | cap = st->data; |
| 765 | |
| 766 | dprintk("%s: cipher '%s': %s, hash: '%s': %s.\n", |
| 767 | __func__, |
| 768 | psb->cipher_string, (cap->cipher_strlen)?"SUPPORTED":"NOT SUPPORTED", |
| 769 | psb->hash_string, (cap->hash_strlen)?"SUPPORTED":"NOT SUPPORTED"); |
| 770 | |
| 771 | if (!cap->hash_strlen) { |
| 772 | if (psb->hash_strlen && psb->crypto_fail_unsupported) |
| 773 | err = -ENOTSUPP; |
| 774 | psb->hash_strlen = 0; |
| 775 | kfree(psb->hash_string); |
| 776 | psb->hash_string = NULL; |
| 777 | } |
| 778 | |
| 779 | if (!cap->cipher_strlen) { |
| 780 | if (psb->cipher_strlen && psb->crypto_fail_unsupported) |
| 781 | err = -ENOTSUPP; |
| 782 | psb->cipher_strlen = 0; |
| 783 | kfree(psb->cipher_string); |
| 784 | psb->cipher_string = NULL; |
| 785 | } |
| 786 | |
| 787 | return err; |
| 788 | } |
| 789 | |
| 790 | /* |
| 791 | * Capabilities handshake response. |
| 792 | */ |
| 793 | static int pohmelfs_capabilities_response(struct netfs_state *st) |
| 794 | { |
| 795 | struct netfs_cmd *cmd = &st->cmd; |
| 796 | int err = 0; |
| 797 | |
| 798 | err = pohmelfs_data_recv(st, st->data, cmd->size); |
| 799 | if (err) |
| 800 | return err; |
| 801 | |
| 802 | switch (cmd->id) { |
| 803 | case POHMELFS_CRYPTO_CAPABILITIES: |
| 804 | return pohmelfs_crypto_cap_response(st); |
| 805 | case POHMELFS_ROOT_CAPABILITIES: |
| 806 | return pohmelfs_root_cap_response(st); |
| 807 | default: |
| 808 | break; |
| 809 | } |
| 810 | return -EINVAL; |
| 811 | } |
| 812 | |
| 813 | /* |
| 814 | * Receiving extended attribute. |
| 815 | * Does not work properly if received size is more than requested one, |
| 816 | * it should not happen with current request/reply model though. |
| 817 | */ |
| 818 | static int pohmelfs_getxattr_response(struct netfs_state *st) |
| 819 | { |
| 820 | struct pohmelfs_sb *psb = st->psb; |
| 821 | struct netfs_cmd *cmd = &st->cmd; |
| 822 | struct pohmelfs_mcache *m; |
| 823 | short error = (signed short)cmd->ext, err; |
| 824 | unsigned int sz, total_size; |
| 825 | |
| 826 | m = pohmelfs_mcache_search(psb, cmd->id); |
| 827 | |
| 828 | dprintk("%s: id: %llu, gen: %llu, err: %d.\n", |
| 829 | __func__, cmd->id, (m)?m->gen:0, error); |
| 830 | |
| 831 | if (!m) { |
| 832 | printk("%s: failed to find getxattr cache entry: id: %llu.\n", __func__, cmd->id); |
| 833 | return -ENOENT; |
| 834 | } |
| 835 | |
| 836 | if (cmd->size) { |
| 837 | sz = min_t(unsigned int, cmd->size, m->size); |
| 838 | err = pohmelfs_data_recv_and_check(st, m->data, sz); |
| 839 | if (err) { |
| 840 | error = err; |
| 841 | goto out; |
| 842 | } |
| 843 | |
| 844 | m->size = sz; |
| 845 | total_size = cmd->size - sz; |
| 846 | |
| 847 | while (total_size) { |
| 848 | sz = min(total_size, st->size); |
| 849 | |
| 850 | err = pohmelfs_data_recv_and_check(st, st->data, sz); |
| 851 | if (err) { |
| 852 | error = err; |
| 853 | break; |
| 854 | } |
| 855 | |
| 856 | total_size -= sz; |
| 857 | } |
| 858 | } |
| 859 | |
| 860 | out: |
| 861 | m->err = error; |
| 862 | complete(&m->complete); |
| 863 | pohmelfs_mcache_put(psb, m); |
| 864 | |
| 865 | return error; |
| 866 | } |
| 867 | |
| 868 | int pohmelfs_data_lock_response(struct netfs_state *st) |
| 869 | { |
| 870 | struct pohmelfs_sb *psb = st->psb; |
| 871 | struct netfs_cmd *cmd = &st->cmd; |
| 872 | struct pohmelfs_mcache *m; |
| 873 | short err = (signed short)cmd->ext; |
| 874 | u64 id = cmd->id; |
| 875 | |
| 876 | m = pohmelfs_mcache_search(psb, id); |
| 877 | |
| 878 | dprintk("%s: id: %llu, gen: %llu, err: %d.\n", |
| 879 | __func__, cmd->id, (m)?m->gen:0, err); |
| 880 | |
| 881 | if (!m) { |
| 882 | pohmelfs_data_recv(st, st->data, cmd->size); |
| 883 | printk("%s: failed to find data lock response: id: %llu.\n", __func__, cmd->id); |
| 884 | return -ENOENT; |
| 885 | } |
| 886 | |
| 887 | if (cmd->size) |
| 888 | err = pohmelfs_data_recv_and_check(st, &m->info, cmd->size); |
| 889 | |
| 890 | m->err = err; |
| 891 | complete(&m->complete); |
| 892 | pohmelfs_mcache_put(psb, m); |
| 893 | |
| 894 | return err; |
| 895 | } |
| 896 | |
| 897 | static void __inline__ netfs_state_reset(struct netfs_state *st) |
| 898 | { |
| 899 | netfs_state_lock_send(st); |
| 900 | netfs_state_exit(st); |
| 901 | netfs_state_init(st); |
| 902 | netfs_state_unlock_send(st); |
| 903 | } |
| 904 | |
| 905 | /* |
| 906 | * Main receiving function, called from dedicated kernel thread. |
| 907 | */ |
| 908 | static int pohmelfs_recv(void *data) |
| 909 | { |
| 910 | int err = -EINTR; |
| 911 | struct netfs_state *st = data; |
| 912 | struct netfs_cmd *cmd = &st->cmd; |
| 913 | |
| 914 | while (!kthread_should_stop()) { |
| 915 | /* |
| 916 | * If socket will be reset after this statement, then |
| 917 | * pohmelfs_data_recv() will just fail and loop will |
| 918 | * start again, so it can be done without any locks. |
| 919 | * |
| 920 | * st->read_socket is needed to prevents state machine |
| 921 | * breaking between this data reading and subsequent one |
| 922 | * in protocol specific functions during connection reset. |
| 923 | * In case of reset we have to read next command and do |
| 924 | * not expect data for old command to magically appear in |
| 925 | * new connection. |
| 926 | */ |
| 927 | st->read_socket = st->socket; |
| 928 | err = pohmelfs_data_recv(st, cmd, sizeof(struct netfs_cmd)); |
| 929 | if (err) { |
| 930 | msleep(1000); |
| 931 | continue; |
| 932 | } |
| 933 | |
| 934 | netfs_convert_cmd(cmd); |
| 935 | |
| 936 | dprintk("%s: cmd: %u, id: %llu, start: %llu, size: %u, " |
| 937 | "ext: %u, csize: %u, cpad: %u.\n", |
| 938 | __func__, cmd->cmd, cmd->id, cmd->start, |
| 939 | cmd->size, cmd->ext, cmd->csize, cmd->cpad); |
| 940 | |
| 941 | if (cmd->csize) { |
| 942 | struct pohmelfs_crypto_engine *e = &st->eng; |
| 943 | |
| 944 | if (unlikely(cmd->csize > e->size/2)) { |
| 945 | netfs_state_reset(st); |
| 946 | continue; |
| 947 | } |
| 948 | |
| 949 | if (e->hash && unlikely(cmd->csize != st->psb->crypto_attached_size)) { |
| 950 | dprintk("%s: cmd: cmd: %u, id: %llu, start: %llu, size: %u, " |
| 951 | "csize: %u != digest size %u.\n", |
| 952 | __func__, cmd->cmd, cmd->id, cmd->start, cmd->size, |
| 953 | cmd->csize, st->psb->crypto_attached_size); |
| 954 | netfs_state_reset(st); |
| 955 | continue; |
| 956 | } |
| 957 | |
| 958 | err = pohmelfs_data_recv(st, e->data, cmd->csize); |
| 959 | if (err) { |
| 960 | netfs_state_reset(st); |
| 961 | continue; |
| 962 | } |
| 963 | |
| 964 | #ifdef CONFIG_POHMELFS_DEBUG |
| 965 | { |
| 966 | unsigned int i; |
| 967 | unsigned char *hash = e->data; |
| 968 | |
| 969 | dprintk("%s: received hash: ", __func__); |
| 970 | for (i=0; i<cmd->csize; ++i) { |
| 971 | printk("%02x ", hash[i]); |
| 972 | } |
| 973 | printk("\n"); |
| 974 | } |
| 975 | #endif |
| 976 | cmd->size -= cmd->csize; |
| 977 | } |
| 978 | |
| 979 | /* |
| 980 | * This should catch protocol breakage and random garbage instead of commands. |
| 981 | */ |
| 982 | if (unlikely((cmd->size > st->size) && (cmd->cmd != NETFS_XATTR_GET))) { |
| 983 | netfs_state_reset(st); |
| 984 | continue; |
| 985 | } |
| 986 | |
| 987 | switch (cmd->cmd) { |
| 988 | case NETFS_READ_PAGE: |
| 989 | err = pohmelfs_read_page_response(st); |
| 990 | break; |
| 991 | case NETFS_READDIR: |
| 992 | err = pohmelfs_readdir_response(st); |
| 993 | break; |
| 994 | case NETFS_LOOKUP: |
| 995 | err = pohmelfs_lookup_response(st); |
| 996 | break; |
| 997 | case NETFS_CREATE: |
| 998 | err = pohmelfs_create_response(st); |
| 999 | break; |
| 1000 | case NETFS_REMOVE: |
| 1001 | err = pohmelfs_remove_response(st); |
| 1002 | break; |
| 1003 | case NETFS_TRANS: |
| 1004 | err = pohmelfs_transaction_response(st); |
| 1005 | break; |
| 1006 | case NETFS_PAGE_CACHE: |
| 1007 | err = pohmelfs_page_cache_response(st); |
| 1008 | break; |
| 1009 | case NETFS_CAPABILITIES: |
| 1010 | err = pohmelfs_capabilities_response(st); |
| 1011 | break; |
| 1012 | case NETFS_LOCK: |
| 1013 | err = pohmelfs_data_lock_response(st); |
| 1014 | break; |
| 1015 | case NETFS_XATTR_GET: |
| 1016 | err = pohmelfs_getxattr_response(st); |
| 1017 | break; |
| 1018 | default: |
| 1019 | printk("%s: wrong cmd: %u, id: %llu, start: %llu, size: %u, ext: %u.\n", |
| 1020 | __func__, cmd->cmd, cmd->id, cmd->start, cmd->size, cmd->ext); |
| 1021 | netfs_state_reset(st); |
| 1022 | break; |
| 1023 | } |
| 1024 | } |
| 1025 | |
| 1026 | while (!kthread_should_stop()) |
| 1027 | schedule_timeout_uninterruptible(msecs_to_jiffies(10)); |
| 1028 | |
| 1029 | return err; |
| 1030 | } |
| 1031 | |
| 1032 | int netfs_state_init(struct netfs_state *st) |
| 1033 | { |
| 1034 | int err; |
| 1035 | struct pohmelfs_ctl *ctl = &st->ctl; |
| 1036 | |
| 1037 | err = sock_create(ctl->addr.sa_family, ctl->type, ctl->proto, &st->socket); |
| 1038 | if (err) { |
| 1039 | printk("%s: failed to create a socket: family: %d, type: %d, proto: %d, err: %d.\n", |
| 1040 | __func__, ctl->addr.sa_family, ctl->type, ctl->proto, err); |
| 1041 | goto err_out_exit; |
| 1042 | } |
| 1043 | |
| 1044 | st->socket->sk->sk_allocation = GFP_NOIO; |
| 1045 | st->socket->sk->sk_sndtimeo = st->socket->sk->sk_rcvtimeo = msecs_to_jiffies(60000); |
| 1046 | |
| 1047 | err = kernel_connect(st->socket, (struct sockaddr *)&ctl->addr, ctl->addrlen, 0); |
| 1048 | if (err) { |
| 1049 | printk("%s: failed to connect to server: idx: %u, err: %d.\n", |
| 1050 | __func__, st->psb->idx, err); |
| 1051 | goto err_out_release; |
| 1052 | } |
| 1053 | st->socket->sk->sk_sndtimeo = st->socket->sk->sk_rcvtimeo = msecs_to_jiffies(60000); |
| 1054 | |
| 1055 | err = netfs_poll_init(st); |
| 1056 | if (err) |
| 1057 | goto err_out_release; |
| 1058 | |
| 1059 | if (st->socket->ops->family == AF_INET) { |
| 1060 | struct sockaddr_in *sin = (struct sockaddr_in *)&ctl->addr; |
| 1061 | printk(KERN_INFO "%s: (re)connected to peer %u.%u.%u.%u:%d.\n", __func__, |
| 1062 | NIPQUAD(sin->sin_addr.s_addr), ntohs(sin->sin_port)); |
| 1063 | } else if (st->socket->ops->family == AF_INET6) { |
| 1064 | struct sockaddr_in6 *sin = (struct sockaddr_in6 *)&ctl->addr; |
| 1065 | printk(KERN_INFO "%s: (re)connected to peer " |
| 1066 | "%pi6:%d", |
| 1067 | __func__, &sin->sin6_addr, ntohs(sin->sin6_port)); |
| 1068 | } |
| 1069 | |
| 1070 | return 0; |
| 1071 | |
| 1072 | err_out_release: |
| 1073 | sock_release(st->socket); |
| 1074 | err_out_exit: |
| 1075 | st->socket = NULL; |
| 1076 | return err; |
| 1077 | } |
| 1078 | |
| 1079 | void netfs_state_exit(struct netfs_state *st) |
| 1080 | { |
| 1081 | if (st->socket) { |
| 1082 | netfs_poll_exit(st); |
| 1083 | st->socket->ops->shutdown(st->socket, 2); |
| 1084 | |
| 1085 | if (st->socket->ops->family == AF_INET) { |
| 1086 | struct sockaddr_in *sin = (struct sockaddr_in *)&st->ctl.addr; |
| 1087 | printk("%s: disconnected from peer %u.%u.%u.%u:%d.\n", __func__, |
| 1088 | NIPQUAD(sin->sin_addr.s_addr), ntohs(sin->sin_port)); |
| 1089 | } else if (st->socket->ops->family == AF_INET6) { |
| 1090 | struct sockaddr_in6 *sin = (struct sockaddr_in6 *)&st->ctl.addr; |
| 1091 | printk("%s: disconnected from peer " |
| 1092 | "%pi6:%d", |
| 1093 | __func__, &sin->sin6_addr, ntohs(sin->sin6_port)); |
| 1094 | } |
| 1095 | |
| 1096 | sock_release(st->socket); |
| 1097 | st->socket = NULL; |
| 1098 | st->read_socket = NULL; |
| 1099 | st->need_reset = 0; |
| 1100 | } |
| 1101 | } |
| 1102 | |
| 1103 | int pohmelfs_state_init_one(struct pohmelfs_sb *psb, struct pohmelfs_config *conf) |
| 1104 | { |
| 1105 | struct netfs_state *st = &conf->state; |
| 1106 | int err = -ENOMEM; |
| 1107 | |
| 1108 | mutex_init(&st->__state_lock); |
| 1109 | mutex_init(&st->__state_send_lock); |
| 1110 | init_waitqueue_head(&st->thread_wait); |
| 1111 | |
| 1112 | st->psb = psb; |
| 1113 | st->trans_root = RB_ROOT; |
| 1114 | mutex_init(&st->trans_lock); |
| 1115 | |
| 1116 | st->size = psb->trans_data_size; |
| 1117 | st->data = kmalloc(st->size, GFP_KERNEL); |
| 1118 | if (!st->data) |
| 1119 | goto err_out_exit; |
| 1120 | |
| 1121 | if (psb->perform_crypto) { |
| 1122 | err = pohmelfs_crypto_engine_init(&st->eng, psb); |
| 1123 | if (err) |
| 1124 | goto err_out_free_data; |
| 1125 | } |
| 1126 | |
| 1127 | err = netfs_state_init(st); |
| 1128 | if (err) |
| 1129 | goto err_out_free_engine; |
| 1130 | |
| 1131 | st->thread = kthread_run(pohmelfs_recv, st, "pohmelfs/%u", psb->idx); |
| 1132 | if (IS_ERR(st->thread)) { |
| 1133 | err = PTR_ERR(st->thread); |
| 1134 | goto err_out_netfs_exit; |
| 1135 | } |
| 1136 | |
| 1137 | if (!psb->active_state) |
| 1138 | psb->active_state = conf; |
| 1139 | |
| 1140 | dprintk("%s: conf: %p, st: %p, socket: %p.\n", |
| 1141 | __func__, conf, st, st->socket); |
| 1142 | return 0; |
| 1143 | |
| 1144 | err_out_netfs_exit: |
| 1145 | netfs_state_exit(st); |
| 1146 | err_out_free_engine: |
| 1147 | pohmelfs_crypto_engine_exit(&st->eng); |
| 1148 | err_out_free_data: |
| 1149 | kfree(st->data); |
| 1150 | err_out_exit: |
| 1151 | return err; |
| 1152 | |
| 1153 | } |
| 1154 | |
| 1155 | void pohmelfs_state_flush_transactions(struct netfs_state *st) |
| 1156 | { |
| 1157 | struct rb_node *rb_node; |
| 1158 | struct netfs_trans_dst *dst; |
| 1159 | |
| 1160 | mutex_lock(&st->trans_lock); |
| 1161 | for (rb_node = rb_first(&st->trans_root); rb_node; ) { |
| 1162 | dst = rb_entry(rb_node, struct netfs_trans_dst, state_entry); |
| 1163 | rb_node = rb_next(rb_node); |
| 1164 | |
| 1165 | dst->trans->result = -EINVAL; |
| 1166 | netfs_trans_remove_nolock(dst, st); |
| 1167 | netfs_trans_drop_dst_nostate(dst); |
| 1168 | } |
| 1169 | mutex_unlock(&st->trans_lock); |
| 1170 | } |
| 1171 | |
| 1172 | static void pohmelfs_state_exit_one(struct pohmelfs_config *c) |
| 1173 | { |
| 1174 | struct netfs_state *st = &c->state; |
| 1175 | |
| 1176 | dprintk("%s: exiting, st: %p.\n", __func__, st); |
| 1177 | if (st->thread) { |
| 1178 | kthread_stop(st->thread); |
| 1179 | st->thread = NULL; |
| 1180 | } |
| 1181 | |
| 1182 | netfs_state_lock_send(st); |
| 1183 | netfs_state_exit(st); |
| 1184 | netfs_state_unlock_send(st); |
| 1185 | |
| 1186 | pohmelfs_state_flush_transactions(st); |
| 1187 | |
| 1188 | pohmelfs_crypto_engine_exit(&st->eng); |
| 1189 | kfree(st->data); |
| 1190 | |
| 1191 | kfree(c); |
| 1192 | } |
| 1193 | |
| 1194 | /* |
| 1195 | * Initialize network stack. It searches for given ID in global |
| 1196 | * configuration table, this contains information of the remote server |
| 1197 | * (address (any supported by socket interface) and port, protocol and so on). |
| 1198 | */ |
| 1199 | int pohmelfs_state_init(struct pohmelfs_sb *psb) |
| 1200 | { |
| 1201 | int err = -ENOMEM; |
| 1202 | |
| 1203 | err = pohmelfs_copy_config(psb); |
| 1204 | if (err) { |
| 1205 | pohmelfs_state_exit(psb); |
| 1206 | return err; |
| 1207 | } |
| 1208 | |
| 1209 | return 0; |
| 1210 | } |
| 1211 | |
| 1212 | void pohmelfs_state_exit(struct pohmelfs_sb *psb) |
| 1213 | { |
| 1214 | struct pohmelfs_config *c, *tmp; |
| 1215 | |
| 1216 | list_for_each_entry_safe(c, tmp, &psb->state_list, config_entry) { |
| 1217 | list_del(&c->config_entry); |
| 1218 | pohmelfs_state_exit_one(c); |
| 1219 | } |
| 1220 | } |
| 1221 | |
| 1222 | void pohmelfs_switch_active(struct pohmelfs_sb *psb) |
| 1223 | { |
| 1224 | struct pohmelfs_config *c = psb->active_state; |
| 1225 | |
| 1226 | if (!list_empty(&psb->state_list)) { |
| 1227 | if (c->config_entry.next != &psb->state_list) { |
| 1228 | psb->active_state = list_entry(c->config_entry.next, |
| 1229 | struct pohmelfs_config, config_entry); |
| 1230 | } else { |
| 1231 | psb->active_state = list_entry(psb->state_list.next, |
| 1232 | struct pohmelfs_config, config_entry); |
| 1233 | } |
| 1234 | |
| 1235 | dprintk("%s: empty: %d, active %p -> %p.\n", |
| 1236 | __func__, list_empty(&psb->state_list), c, |
| 1237 | psb->active_state); |
| 1238 | } else |
| 1239 | psb->active_state = NULL; |
| 1240 | } |
| 1241 | |
| 1242 | void pohmelfs_check_states(struct pohmelfs_sb *psb) |
| 1243 | { |
| 1244 | struct pohmelfs_config *c, *tmp; |
| 1245 | LIST_HEAD(delete_list); |
| 1246 | |
| 1247 | mutex_lock(&psb->state_lock); |
| 1248 | list_for_each_entry_safe(c, tmp, &psb->state_list, config_entry) { |
| 1249 | if (pohmelfs_config_check(c, psb->idx)) { |
| 1250 | |
| 1251 | if (psb->active_state == c) |
| 1252 | pohmelfs_switch_active(psb); |
| 1253 | list_move(&c->config_entry, &delete_list); |
| 1254 | } |
| 1255 | } |
| 1256 | pohmelfs_copy_config(psb); |
| 1257 | mutex_unlock(&psb->state_lock); |
| 1258 | |
| 1259 | list_for_each_entry_safe(c, tmp, &delete_list, config_entry) { |
| 1260 | list_del(&c->config_entry); |
| 1261 | pohmelfs_state_exit_one(c); |
| 1262 | } |
| 1263 | } |