2 * 2007+ Copyright (c) Evgeniy Polyakov <zbr@ioremap.net>
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.
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.
16 #include <linux/fsnotify.h>
17 #include <linux/jhash.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>
25 #include <linux/vmalloc.h>
29 static int pohmelfs_ftrans_size = 10240;
30 static u32 *pohmelfs_ftrans;
32 int pohmelfs_ftrans_init(void)
34 pohmelfs_ftrans = vmalloc(pohmelfs_ftrans_size * 4);
41 void pohmelfs_ftrans_exit(void)
43 vfree(pohmelfs_ftrans);
46 void pohmelfs_ftrans_clean(u64 id)
48 if (pohmelfs_ftrans) {
49 u32 i = id & 0xffffffff;
50 int idx = i % pohmelfs_ftrans_size;
52 pohmelfs_ftrans[idx] = 0;
56 void pohmelfs_ftrans_update(u64 id)
58 if (pohmelfs_ftrans) {
59 u32 i = id & 0xffffffff;
60 int idx = i % pohmelfs_ftrans_size;
62 pohmelfs_ftrans[idx] = i;
66 int pohmelfs_ftrans_check(u64 id)
68 if (pohmelfs_ftrans) {
69 u32 i = id & 0xffffffff;
70 int idx = i % pohmelfs_ftrans_size;
72 return (pohmelfs_ftrans[idx] == i);
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.
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.
89 * If object is not found for given data, it is discarded.
91 * All requests are received by dedicated kernel thread.
95 * Basic network sending/receiving functions.
96 * Blocked mode is used.
98 static int netfs_data_recv(struct netfs_state *st, void *buf, u64 size)
109 msg.msg_iov = (struct iovec *)&iov;
113 msg.msg_control = NULL;
114 msg.msg_controllen = 0;
115 msg.msg_flags = MSG_DONTWAIT;
117 err = kernel_recvmsg(st->socket, &msg, &iov, 1, iov.iov_len,
120 printk("%s: failed to recv data: size: %llu, err: %d.\n", __func__, size, err);
128 static int pohmelfs_data_recv(struct netfs_state *st, void *data, unsigned int size)
130 unsigned int revents = 0;
131 unsigned int err_mask = POLLERR | POLLHUP | POLLRDHUP;
132 unsigned int mask = err_mask | POLLIN;
135 while (size && !err) {
136 revents = netfs_state_poll(st);
138 if (!(revents & mask)) {
142 prepare_to_wait(&st->thread_wait, &wait, TASK_INTERRUPTIBLE);
143 if (kthread_should_stop())
146 revents = netfs_state_poll(st);
151 if (signal_pending(current))
157 finish_wait(&st->thread_wait, &wait);
161 netfs_state_lock(st);
162 if (st->socket && (st->read_socket == st->socket) && (revents & POLLIN)) {
163 err = netfs_data_recv(st, data, size);
172 if (revents & err_mask) {
173 printk("%s: revents: %x, socket: %p, size: %u, err: %d.\n",
174 __func__, revents, st->socket, size, err);
177 netfs_state_unlock(st);
180 if (netfs_state_trylock_send(st)) {
181 netfs_state_exit(st);
182 err = netfs_state_init(st);
185 netfs_state_unlock_send(st);
191 if (kthread_should_stop())
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);
204 int pohmelfs_data_recv_and_check(struct netfs_state *st, void *data, unsigned int size)
206 struct netfs_cmd *cmd = &st->cmd;
209 err = pohmelfs_data_recv(st, data, size);
213 return pohmelfs_crypto_process_input_data(&st->eng, cmd->iv, data, NULL, size);
220 struct netfs_poll_helper
223 struct netfs_state *st;
226 static int netfs_queue_wake(wait_queue_t *wait, unsigned mode, int sync, void *key)
228 struct netfs_state *st = container_of(wait, struct netfs_state, wait);
230 wake_up(&st->thread_wait);
234 static void netfs_queue_func(struct file *file, wait_queue_head_t *whead,
237 struct netfs_state *st = container_of(pt, struct netfs_poll_helper, pt)->st;
240 init_waitqueue_func_entry(&st->wait, netfs_queue_wake);
241 add_wait_queue(whead, &st->wait);
244 static void netfs_poll_exit(struct netfs_state *st)
247 remove_wait_queue(st->whead, &st->wait);
252 static int netfs_poll_init(struct netfs_state *st)
254 struct netfs_poll_helper ph;
257 init_poll_funcptr(&ph.pt, &netfs_queue_func);
259 st->socket->ops->poll(NULL, st->socket, &ph.pt);
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.
268 * There is a work in progress of allowing to call copy_to_user() directly from
269 * async receiving kernel thread.
271 static int pohmelfs_read_page_response(struct netfs_state *st)
273 struct pohmelfs_sb *psb = st->psb;
274 struct netfs_cmd *cmd = &st->cmd;
279 if (cmd->size > PAGE_CACHE_SIZE) {
284 inode = ilookup(st->psb->sb, cmd->id);
286 printk("%s: failed to find inode: id: %llu.\n", __func__, cmd->id);
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);
297 unsigned int sz = min(cmd->size, st->size);
299 err = pohmelfs_data_recv(st, st->data, sz);
308 goto err_out_page_put;
316 err = pohmelfs_data_recv(st, addr, cmd->size);
320 goto err_out_page_unlock;
323 dprintk("%s: page: %p, start: %llu, size: %u, locked: %d.\n",
324 __func__, page, cmd->start, cmd->size, PageLocked(page));
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);
330 goto err_out_page_unlock;
332 SetPageUptodate(page);
334 page_cache_release(page);
337 pohmelfs_put_inode(POHMELFS_I(inode));
338 wake_up(&st->psb->wait);
346 page_cache_release(page);
348 pohmelfs_put_inode(POHMELFS_I(inode));
350 wake_up(&st->psb->wait);
354 static int pohmelfs_check_name(struct pohmelfs_inode *parent, struct qstr *str,
355 struct netfs_inode_info *info)
358 struct pohmelfs_name *n;
362 mutex_lock(&parent->offset_lock);
363 n = pohmelfs_search_hash(parent, str->hash);
366 mutex_unlock(&parent->offset_lock);
371 inode = ilookup(parent->vfs_inode.i_sb, ino);
375 dprintk("%s: parent: %llu, inode: %llu.\n", __func__, parent->ino, ino);
377 pohmelfs_fill_inode(inode, info);
378 pohmelfs_put_inode(POHMELFS_I(inode));
385 * Readdir response from server. If special field is set, we wakeup
386 * listener (readdir() call), which will copy data to userspace.
388 static int pohmelfs_readdir_response(struct netfs_state *st)
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;
397 if (cmd->size > st->size)
400 inode = ilookup(st->psb->sb, cmd->id);
402 printk("%s: failed to find inode: id: %llu.\n", __func__, cmd->id);
405 parent = POHMELFS_I(inode);
407 if (!cmd->size && cmd->start) {
415 err = pohmelfs_data_recv_and_check(st, st->data, cmd->size);
419 info = (struct netfs_inode_info *)(st->data);
421 name = (char *)(info + 1);
422 str.len = cmd->size - sizeof(struct netfs_inode_info) - 1 - cmd->cpad;
425 str.hash = jhash(str.name, str.len, 0);
427 netfs_convert_inode_info(info);
430 err = pohmelfs_check_name(parent, &str, info);
438 info->ino = cmd->start;
440 info->ino = pohmelfs_new_ino(st->psb);
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,
446 npi = pohmelfs_new_inode(st->psb, parent, &str, info, 0);
453 struct dentry *dentry, *alias, *pd;
455 set_bit(NETFS_INODE_REMOTE_SYNCED, &npi->state);
456 clear_bit(NETFS_INODE_OWNED, &npi->state);
458 pd = d_find_alias(&parent->vfs_inode);
460 str.hash = full_name_hash(str.name, str.len);
461 dentry = d_alloc(pd, &str);
463 alias = d_materialise_unique(dentry, &npi->vfs_inode);
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);
479 pohmelfs_put_inode(parent);
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);
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.
497 static int pohmelfs_lookup_response(struct netfs_state *st)
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;
506 inode = ilookup(st->psb->sb, cmd->id);
508 printk("%s: lookup response: id: %llu, start: %llu, size: %u.\n",
509 __func__, cmd->id, cmd->start, cmd->size);
513 parent = POHMELFS_I(inode);
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);
527 err = pohmelfs_data_recv_and_check(st, st->data, cmd->size);
531 info = (struct netfs_inode_info *)(st->data);
532 name = (char *)(info + 1);
534 netfs_convert_inode_info(info);
536 info->ino = cmd->start;
538 info->ino = pohmelfs_new_ino(st->psb);
540 dprintk("%s: parent: %llu, ino: %llu, name: '%s', start: %llu.\n",
541 __func__, parent->ino, info->ino, name, cmd->start);
544 npi = pohmelfs_new_inode(st->psb, parent, NULL, info, 0);
549 str.len = cmd->size - sizeof(struct netfs_inode_info) - 1 - cmd->cpad;
550 str.hash = jhash(name, str.len, 0);
552 npi = pohmelfs_new_inode(st->psb, parent, &str, info, 0);
560 set_bit(NETFS_INODE_REMOTE_SYNCED, &npi->state);
561 clear_bit(NETFS_INODE_OWNED, &npi->state);
564 clear_bit(NETFS_COMMAND_PENDING, &parent->state);
565 pohmelfs_put_inode(parent);
567 wake_up(&st->psb->wait);
572 pohmelfs_put_inode(parent);
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);
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.
585 static int pohmelfs_create_response(struct netfs_state *st)
588 struct netfs_cmd *cmd = &st->cmd;
589 struct pohmelfs_inode *pi;
591 inode = ilookup(st->psb->sb, cmd->id);
593 printk("%s: failed to find inode: id: %llu, start: %llu.\n",
594 __func__, cmd->id, cmd->start);
598 pi = POHMELFS_I(inode);
601 * To lock or not to lock?
602 * We actually do not care if it races...
605 make_bad_inode(inode);
606 set_bit(NETFS_INODE_REMOTE_SYNCED, &pi->state);
608 pohmelfs_put_inode(pi);
610 wake_up(&st->psb->wait);
614 wake_up(&st->psb->wait);
619 * Object remove response. Just says that remove request has been received.
620 * Used in cache coherency protocol.
622 static int pohmelfs_remove_response(struct netfs_state *st)
624 struct netfs_cmd *cmd = &st->cmd;
627 err = pohmelfs_data_recv_and_check(st, st->data, cmd->size);
631 dprintk("%s: parent: %llu, path: '%s'.\n", __func__, cmd->id, (char *)st->data);
637 * Transaction reply processing.
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.
645 static int pohmelfs_transaction_response(struct netfs_state *st)
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;
652 mutex_lock(&st->trans_lock);
653 dst = netfs_trans_search(st, cmd->start);
655 netfs_trans_remove_nolock(dst, st);
658 pohmelfs_ftrans_update(cmd->start);
660 mutex_unlock(&st->trans_lock);
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);
671 netfs_trans_drop_dst_nostate(dst);
674 wake_up(&st->psb->wait);
679 * Inode metadata cache coherency message.
681 static int pohmelfs_page_cache_response(struct netfs_state *st)
683 struct netfs_cmd *cmd = &st->cmd;
686 dprintk("%s: st: %p, id: %llu, start: %llu, size: %u.\n", __func__, st, cmd->id, cmd->start, cmd->size);
688 inode = ilookup(st->psb->sb, cmd->id);
690 printk("%s: failed to find inode: id: %llu.\n", __func__, cmd->id);
694 set_bit(NETFS_INODE_NEED_FLUSH, &POHMELFS_I(inode)->state);
695 pohmelfs_put_inode(POHMELFS_I(inode));
701 * Root capabilities response: export statistics
702 * like used and available size, number of files and dirs,
705 static int pohmelfs_root_cap_response(struct netfs_state *st)
707 struct netfs_cmd *cmd = &st->cmd;
708 struct netfs_root_capabilities *cap;
709 struct pohmelfs_sb *psb = st->psb;
711 if (cmd->size != sizeof(struct netfs_root_capabilities)) {
719 netfs_convert_root_capabilities(cap);
721 if (psb->total_size < cap->used + cap->avail)
722 psb->total_size = cap->used + cap->avail;
724 psb->avail_size = cap->avail;
725 psb->state_flags = cap->flags;
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);
732 if (psb->state_flags & POHMELFS_FLAGS_XATTR)
733 printk(KERN_INFO "Mounting POHMELFS (%d) "
734 "with extended attributes support.\n", psb->idx);
736 if (atomic_read(&psb->total_inodes) <= 1)
737 atomic_long_set(&psb->total_inodes, cap->nr_files);
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);
748 * Crypto capabilities of the server, where it says that
749 * it supports or does not requested hash/cipher algorithms.
751 static int pohmelfs_crypto_cap_response(struct netfs_state *st)
753 struct netfs_cmd *cmd = &st->cmd;
754 struct netfs_crypto_capabilities *cap;
755 struct pohmelfs_sb *psb = st->psb;
758 if (cmd->size != sizeof(struct netfs_crypto_capabilities)) {
766 dprintk("%s: cipher '%s': %s, hash: '%s': %s.\n",
768 psb->cipher_string, (cap->cipher_strlen)?"SUPPORTED":"NOT SUPPORTED",
769 psb->hash_string, (cap->hash_strlen)?"SUPPORTED":"NOT SUPPORTED");
771 if (!cap->hash_strlen) {
772 if (psb->hash_strlen && psb->crypto_fail_unsupported)
774 psb->hash_strlen = 0;
775 kfree(psb->hash_string);
776 psb->hash_string = NULL;
779 if (!cap->cipher_strlen) {
780 if (psb->cipher_strlen && psb->crypto_fail_unsupported)
782 psb->cipher_strlen = 0;
783 kfree(psb->cipher_string);
784 psb->cipher_string = NULL;
791 * Capabilities handshake response.
793 static int pohmelfs_capabilities_response(struct netfs_state *st)
795 struct netfs_cmd *cmd = &st->cmd;
798 err = pohmelfs_data_recv(st, st->data, cmd->size);
803 case POHMELFS_CRYPTO_CAPABILITIES:
804 return pohmelfs_crypto_cap_response(st);
805 case POHMELFS_ROOT_CAPABILITIES:
806 return pohmelfs_root_cap_response(st);
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.
818 static int pohmelfs_getxattr_response(struct netfs_state *st)
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;
826 m = pohmelfs_mcache_search(psb, cmd->id);
828 dprintk("%s: id: %llu, gen: %llu, err: %d.\n",
829 __func__, cmd->id, (m)?m->gen:0, error);
832 printk("%s: failed to find getxattr cache entry: id: %llu.\n", __func__, cmd->id);
837 sz = min_t(unsigned int, cmd->size, m->size);
838 err = pohmelfs_data_recv_and_check(st, m->data, sz);
845 total_size = cmd->size - sz;
848 sz = min(total_size, st->size);
850 err = pohmelfs_data_recv_and_check(st, st->data, sz);
862 complete(&m->complete);
863 pohmelfs_mcache_put(psb, m);
868 int pohmelfs_data_lock_response(struct netfs_state *st)
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;
876 m = pohmelfs_mcache_search(psb, id);
878 dprintk("%s: id: %llu, gen: %llu, err: %d.\n",
879 __func__, cmd->id, (m)?m->gen:0, err);
882 pohmelfs_data_recv(st, st->data, cmd->size);
883 printk("%s: failed to find data lock response: id: %llu.\n", __func__, cmd->id);
888 err = pohmelfs_data_recv_and_check(st, &m->info, cmd->size);
891 complete(&m->complete);
892 pohmelfs_mcache_put(psb, m);
897 static void __inline__ netfs_state_reset(struct netfs_state *st)
899 netfs_state_lock_send(st);
900 netfs_state_exit(st);
901 netfs_state_init(st);
902 netfs_state_unlock_send(st);
906 * Main receiving function, called from dedicated kernel thread.
908 static int pohmelfs_recv(void *data)
911 struct netfs_state *st = data;
912 struct netfs_cmd *cmd = &st->cmd;
914 while (!kthread_should_stop()) {
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.
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
927 st->read_socket = st->socket;
928 err = pohmelfs_data_recv(st, cmd, sizeof(struct netfs_cmd));
934 netfs_convert_cmd(cmd);
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);
942 struct pohmelfs_crypto_engine *e = &st->eng;
944 if (unlikely(cmd->csize > e->size/2)) {
945 netfs_state_reset(st);
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);
958 err = pohmelfs_data_recv(st, e->data, cmd->csize);
960 netfs_state_reset(st);
964 #ifdef CONFIG_POHMELFS_DEBUG
967 unsigned char *hash = e->data;
969 dprintk("%s: received hash: ", __func__);
970 for (i=0; i<cmd->csize; ++i) {
971 printk("%02x ", hash[i]);
976 cmd->size -= cmd->csize;
980 * This should catch protocol breakage and random garbage instead of commands.
982 if (unlikely((cmd->size > st->size) && (cmd->cmd != NETFS_XATTR_GET))) {
983 netfs_state_reset(st);
988 case NETFS_READ_PAGE:
989 err = pohmelfs_read_page_response(st);
992 err = pohmelfs_readdir_response(st);
995 err = pohmelfs_lookup_response(st);
998 err = pohmelfs_create_response(st);
1001 err = pohmelfs_remove_response(st);
1004 err = pohmelfs_transaction_response(st);
1006 case NETFS_PAGE_CACHE:
1007 err = pohmelfs_page_cache_response(st);
1009 case NETFS_CAPABILITIES:
1010 err = pohmelfs_capabilities_response(st);
1013 err = pohmelfs_data_lock_response(st);
1015 case NETFS_XATTR_GET:
1016 err = pohmelfs_getxattr_response(st);
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);
1026 while (!kthread_should_stop())
1027 schedule_timeout_uninterruptible(msecs_to_jiffies(10));
1032 int netfs_state_init(struct netfs_state *st)
1035 struct pohmelfs_ctl *ctl = &st->ctl;
1037 err = sock_create(ctl->addr.sa_family, ctl->type, ctl->proto, &st->socket);
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);
1044 st->socket->sk->sk_allocation = GFP_NOIO;
1045 st->socket->sk->sk_sndtimeo = st->socket->sk->sk_rcvtimeo = msecs_to_jiffies(60000);
1047 err = kernel_connect(st->socket, (struct sockaddr *)&ctl->addr, ctl->addrlen, 0);
1049 printk("%s: failed to connect to server: idx: %u, err: %d.\n",
1050 __func__, st->psb->idx, err);
1051 goto err_out_release;
1053 st->socket->sk->sk_sndtimeo = st->socket->sk->sk_rcvtimeo = msecs_to_jiffies(60000);
1055 err = netfs_poll_init(st);
1057 goto err_out_release;
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 "
1067 __func__, &sin->sin6_addr, ntohs(sin->sin6_port));
1073 sock_release(st->socket);
1079 void netfs_state_exit(struct netfs_state *st)
1082 netfs_poll_exit(st);
1083 st->socket->ops->shutdown(st->socket, 2);
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 "
1093 __func__, &sin->sin6_addr, ntohs(sin->sin6_port));
1096 sock_release(st->socket);
1098 st->read_socket = NULL;
1103 int pohmelfs_state_init_one(struct pohmelfs_sb *psb, struct pohmelfs_config *conf)
1105 struct netfs_state *st = &conf->state;
1108 mutex_init(&st->__state_lock);
1109 mutex_init(&st->__state_send_lock);
1110 init_waitqueue_head(&st->thread_wait);
1113 st->trans_root = RB_ROOT;
1114 mutex_init(&st->trans_lock);
1116 st->size = psb->trans_data_size;
1117 st->data = kmalloc(st->size, GFP_KERNEL);
1121 if (psb->perform_crypto) {
1122 err = pohmelfs_crypto_engine_init(&st->eng, psb);
1124 goto err_out_free_data;
1127 err = netfs_state_init(st);
1129 goto err_out_free_engine;
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;
1137 if (!psb->active_state)
1138 psb->active_state = conf;
1140 dprintk("%s: conf: %p, st: %p, socket: %p.\n",
1141 __func__, conf, st, st->socket);
1145 netfs_state_exit(st);
1146 err_out_free_engine:
1147 pohmelfs_crypto_engine_exit(&st->eng);
1155 void pohmelfs_state_flush_transactions(struct netfs_state *st)
1157 struct rb_node *rb_node;
1158 struct netfs_trans_dst *dst;
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);
1165 dst->trans->result = -EINVAL;
1166 netfs_trans_remove_nolock(dst, st);
1167 netfs_trans_drop_dst_nostate(dst);
1169 mutex_unlock(&st->trans_lock);
1172 static void pohmelfs_state_exit_one(struct pohmelfs_config *c)
1174 struct netfs_state *st = &c->state;
1176 dprintk("%s: exiting, st: %p.\n", __func__, st);
1178 kthread_stop(st->thread);
1182 netfs_state_lock_send(st);
1183 netfs_state_exit(st);
1184 netfs_state_unlock_send(st);
1186 pohmelfs_state_flush_transactions(st);
1188 pohmelfs_crypto_engine_exit(&st->eng);
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).
1199 int pohmelfs_state_init(struct pohmelfs_sb *psb)
1203 err = pohmelfs_copy_config(psb);
1205 pohmelfs_state_exit(psb);
1212 void pohmelfs_state_exit(struct pohmelfs_sb *psb)
1214 struct pohmelfs_config *c, *tmp;
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);
1222 void pohmelfs_switch_active(struct pohmelfs_sb *psb)
1224 struct pohmelfs_config *c = psb->active_state;
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);
1231 psb->active_state = list_entry(psb->state_list.next,
1232 struct pohmelfs_config, config_entry);
1235 dprintk("%s: empty: %d, active %p -> %p.\n",
1236 __func__, list_empty(&psb->state_list), c,
1239 psb->active_state = NULL;
1242 void pohmelfs_check_states(struct pohmelfs_sb *psb)
1244 struct pohmelfs_config *c, *tmp;
1245 LIST_HEAD(delete_list);
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)) {
1251 if (psb->active_state == c)
1252 pohmelfs_switch_active(psb);
1253 list_move(&c->config_entry, &delete_list);
1256 pohmelfs_copy_config(psb);
1257 mutex_unlock(&psb->state_lock);
1259 list_for_each_entry_safe(c, tmp, &delete_list, config_entry) {
1260 list_del(&c->config_entry);
1261 pohmelfs_state_exit_one(c);