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/slab.h>
24
#include <linux/swap.h>
25
#include <linux/syscalls.h>
26
#include <linux/vmalloc.h>
31
* Async machinery lives here.
32
* All commands being sent to server do _not_ require sync reply,
33
* instead, if it is really needed, like readdir or readpage, caller
34
* sleeps waiting for data, which will be placed into provided buffer
35
* and caller will be awakened.
37
* Every command response can come without some listener. For example
38
* readdir response will add new objects into cache without appropriate
39
* request from userspace. This is used in cache coherency.
41
* If object is not found for given data, it is discarded.
43
* All requests are received by dedicated kernel thread.
47
* Basic network sending/receiving functions.
48
* Blocked mode is used.
50
static int netfs_data_recv(struct netfs_state *st, void *buf, u64 size)
61
msg.msg_iov = (struct iovec *)&iov;
65
msg.msg_control = NULL;
66
msg.msg_controllen = 0;
67
msg.msg_flags = MSG_DONTWAIT;
69
err = kernel_recvmsg(st->socket, &msg, &iov, 1, iov.iov_len,
72
printk("%s: failed to recv data: size: %llu, err: %d.\n", __func__, size, err);
80
static int pohmelfs_data_recv(struct netfs_state *st, void *data, unsigned int size)
82
unsigned int revents = 0;
83
unsigned int err_mask = POLLERR | POLLHUP | POLLRDHUP;
84
unsigned int mask = err_mask | POLLIN;
87
while (size && !err) {
88
revents = netfs_state_poll(st);
90
if (!(revents & mask)) {
94
prepare_to_wait(&st->thread_wait, &wait, TASK_INTERRUPTIBLE);
95
if (kthread_should_stop())
98
revents = netfs_state_poll(st);
103
if (signal_pending(current))
109
finish_wait(&st->thread_wait, &wait);
113
netfs_state_lock(st);
114
if (st->socket && (st->read_socket == st->socket) && (revents & POLLIN)) {
115
err = netfs_data_recv(st, data, size);
124
if (revents & err_mask) {
125
printk("%s: revents: %x, socket: %p, size: %u, err: %d.\n",
126
__func__, revents, st->socket, size, err);
129
netfs_state_unlock(st);
132
if (netfs_state_trylock_send(st)) {
133
netfs_state_exit(st);
134
err = netfs_state_init(st);
137
netfs_state_unlock_send(st);
143
if (kthread_should_stop())
147
printk("%s: socket: %p, read_socket: %p, revents: %x, rev_error: %d, "
148
"should_stop: %d, size: %u, err: %d.\n",
149
__func__, st->socket, st->read_socket,
150
revents, revents & err_mask, kthread_should_stop(), size, err);
156
int pohmelfs_data_recv_and_check(struct netfs_state *st, void *data, unsigned int size)
158
struct netfs_cmd *cmd = &st->cmd;
161
err = pohmelfs_data_recv(st, data, size);
165
return pohmelfs_crypto_process_input_data(&st->eng, cmd->iv, data, NULL, size);
172
struct netfs_poll_helper {
174
struct netfs_state *st;
177
static int netfs_queue_wake(wait_queue_t *wait, unsigned mode, int sync, void *key)
179
struct netfs_state *st = container_of(wait, struct netfs_state, wait);
181
wake_up(&st->thread_wait);
185
static void netfs_queue_func(struct file *file, wait_queue_head_t *whead,
188
struct netfs_state *st = container_of(pt, struct netfs_poll_helper, pt)->st;
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init_waitqueue_func_entry(&st->wait, netfs_queue_wake);
192
add_wait_queue(whead, &st->wait);
195
static void netfs_poll_exit(struct netfs_state *st)
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remove_wait_queue(st->whead, &st->wait);
203
static int netfs_poll_init(struct netfs_state *st)
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struct netfs_poll_helper ph;
208
init_poll_funcptr(&ph.pt, &netfs_queue_func);
210
st->socket->ops->poll(NULL, st->socket, &ph.pt);
215
* Get response for readpage command. We search inode and page in its mapping
216
* and copy data into. If it was async request, then we queue page into shared
217
* data and wakeup listener, who will copy it to userspace.
219
* There is a work in progress of allowing to call copy_to_user() directly from
220
* async receiving kernel thread.
222
static int pohmelfs_read_page_response(struct netfs_state *st)
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struct pohmelfs_sb *psb = st->psb;
225
struct netfs_cmd *cmd = &st->cmd;
230
if (cmd->size > PAGE_CACHE_SIZE) {
235
inode = ilookup(st->psb->sb, cmd->id);
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printk("%s: failed to find inode: id: %llu.\n", __func__, cmd->id);
242
page = find_get_page(inode->i_mapping, cmd->start >> PAGE_CACHE_SHIFT);
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if (!page || !PageLocked(page)) {
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printk("%s: failed to find/lock page: page: %p, id: %llu, start: %llu, index: %llu.\n",
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__func__, page, cmd->id, cmd->start, cmd->start >> PAGE_CACHE_SHIFT);
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unsigned int sz = min(cmd->size, st->size);
250
err = pohmelfs_data_recv(st, st->data, sz);
259
goto err_out_page_put;
267
err = pohmelfs_data_recv(st, addr, cmd->size);
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goto err_out_page_unlock;
274
dprintk("%s: page: %p, start: %llu, size: %u, locked: %d.\n",
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__func__, page, cmd->start, cmd->size, PageLocked(page));
277
SetPageChecked(page);
278
if ((psb->hash_string || psb->cipher_string) && psb->perform_crypto && cmd->size) {
279
err = pohmelfs_crypto_process_input_page(&st->eng, page, cmd->size, cmd->iv);
281
goto err_out_page_unlock;
283
SetPageUptodate(page);
285
page_cache_release(page);
288
pohmelfs_put_inode(POHMELFS_I(inode));
289
wake_up(&st->psb->wait);
297
page_cache_release(page);
299
pohmelfs_put_inode(POHMELFS_I(inode));
301
wake_up(&st->psb->wait);
305
static int pohmelfs_check_name(struct pohmelfs_inode *parent, struct qstr *str,
306
struct netfs_inode_info *info)
309
struct pohmelfs_name *n;
313
mutex_lock(&parent->offset_lock);
314
n = pohmelfs_search_hash(parent, str->hash);
317
mutex_unlock(&parent->offset_lock);
322
inode = ilookup(parent->vfs_inode.i_sb, ino);
326
dprintk("%s: parent: %llu, inode: %llu.\n", __func__, parent->ino, ino);
328
pohmelfs_fill_inode(inode, info);
329
pohmelfs_put_inode(POHMELFS_I(inode));
336
* Readdir response from server. If special field is set, we wakeup
337
* listener (readdir() call), which will copy data to userspace.
339
static int pohmelfs_readdir_response(struct netfs_state *st)
342
struct netfs_cmd *cmd = &st->cmd;
343
struct netfs_inode_info *info;
344
struct pohmelfs_inode *parent = NULL, *npi;
345
int err = 0, last = cmd->ext;
348
if (cmd->size > st->size)
351
inode = ilookup(st->psb->sb, cmd->id);
353
printk("%s: failed to find inode: id: %llu.\n", __func__, cmd->id);
356
parent = POHMELFS_I(inode);
358
if (!cmd->size && cmd->start) {
366
err = pohmelfs_data_recv_and_check(st, st->data, cmd->size);
370
info = (struct netfs_inode_info *)(st->data);
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name = (char *)(info + 1);
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str.len = cmd->size - sizeof(struct netfs_inode_info) - 1 - cmd->cpad;
376
str.hash = jhash(str.name, str.len, 0);
378
netfs_convert_inode_info(info);
381
err = pohmelfs_check_name(parent, &str, info);
389
info->ino = cmd->start;
391
info->ino = pohmelfs_new_ino(st->psb);
393
dprintk("%s: parent: %llu, ino: %llu, name: '%s', hash: %x, len: %u, mode: %o.\n",
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__func__, parent->ino, info->ino, str.name, str.hash, str.len,
397
npi = pohmelfs_new_inode(st->psb, parent, &str, info, 0);
404
struct dentry *dentry, *alias, *pd;
406
set_bit(NETFS_INODE_REMOTE_SYNCED, &npi->state);
407
clear_bit(NETFS_INODE_OWNED, &npi->state);
409
pd = d_find_alias(&parent->vfs_inode);
411
str.hash = full_name_hash(str.name, str.len);
412
dentry = d_alloc(pd, &str);
414
alias = d_materialise_unique(dentry, &npi->vfs_inode);
426
set_bit(NETFS_INODE_REMOTE_DIR_SYNCED, &parent->state);
427
set_bit(NETFS_INODE_REMOTE_SYNCED, &parent->state);
428
wake_up(&st->psb->wait);
430
pohmelfs_put_inode(parent);
435
clear_bit(NETFS_INODE_REMOTE_DIR_SYNCED, &parent->state);
436
printk("%s: parent: %llu, ino: %llu, cmd_id: %llu.\n", __func__, parent->ino, cmd->start, cmd->id);
437
pohmelfs_put_inode(parent);
438
wake_up(&st->psb->wait);
443
* Lookup command response.
444
* It searches for inode to be looked at (if it exists) and substitutes
445
* its inode information (size, permission, mode and so on), if inode does
446
* not exist, new one will be created and inserted into caches.
448
static int pohmelfs_lookup_response(struct netfs_state *st)
450
struct inode *inode = NULL;
451
struct netfs_cmd *cmd = &st->cmd;
452
struct netfs_inode_info *info;
453
struct pohmelfs_inode *parent = NULL, *npi;
457
inode = ilookup(st->psb->sb, cmd->id);
459
printk("%s: lookup response: id: %llu, start: %llu, size: %u.\n",
460
__func__, cmd->id, cmd->start, cmd->size);
464
parent = POHMELFS_I(inode);
471
if (cmd->size < sizeof(struct netfs_inode_info)) {
472
printk("%s: broken lookup response: id: %llu, start: %llu, size: %u.\n",
473
__func__, cmd->id, cmd->start, cmd->size);
478
err = pohmelfs_data_recv_and_check(st, st->data, cmd->size);
482
info = (struct netfs_inode_info *)(st->data);
483
name = (char *)(info + 1);
485
netfs_convert_inode_info(info);
487
info->ino = cmd->start;
489
info->ino = pohmelfs_new_ino(st->psb);
491
dprintk("%s: parent: %llu, ino: %llu, name: '%s', start: %llu.\n",
492
__func__, parent->ino, info->ino, name, cmd->start);
495
npi = pohmelfs_new_inode(st->psb, parent, NULL, info, 0);
500
str.len = cmd->size - sizeof(struct netfs_inode_info) - 1 - cmd->cpad;
501
str.hash = jhash(name, str.len, 0);
503
npi = pohmelfs_new_inode(st->psb, parent, &str, info, 0);
511
set_bit(NETFS_INODE_REMOTE_SYNCED, &npi->state);
512
clear_bit(NETFS_INODE_OWNED, &npi->state);
515
clear_bit(NETFS_COMMAND_PENDING, &parent->state);
516
pohmelfs_put_inode(parent);
518
wake_up(&st->psb->wait);
523
pohmelfs_put_inode(parent);
525
clear_bit(NETFS_COMMAND_PENDING, &parent->state);
526
wake_up(&st->psb->wait);
527
printk("%s: inode: %p, id: %llu, start: %llu, size: %u, err: %d.\n",
528
__func__, inode, cmd->id, cmd->start, cmd->size, err);
533
* Create response, just marks local inode as 'created', so that writeback
534
* for any of its children (or own) would not try to sync it again.
536
static int pohmelfs_create_response(struct netfs_state *st)
539
struct netfs_cmd *cmd = &st->cmd;
540
struct pohmelfs_inode *pi;
542
inode = ilookup(st->psb->sb, cmd->id);
544
printk("%s: failed to find inode: id: %llu, start: %llu.\n",
545
__func__, cmd->id, cmd->start);
549
pi = POHMELFS_I(inode);
552
* To lock or not to lock?
553
* We actually do not care if it races...
556
make_bad_inode(inode);
557
set_bit(NETFS_INODE_REMOTE_SYNCED, &pi->state);
559
pohmelfs_put_inode(pi);
561
wake_up(&st->psb->wait);
565
wake_up(&st->psb->wait);
570
* Object remove response. Just says that remove request has been received.
571
* Used in cache coherency protocol.
573
static int pohmelfs_remove_response(struct netfs_state *st)
575
struct netfs_cmd *cmd = &st->cmd;
578
err = pohmelfs_data_recv_and_check(st, st->data, cmd->size);
582
dprintk("%s: parent: %llu, path: '%s'.\n", __func__, cmd->id, (char *)st->data);
588
* Transaction reply processing.
590
* Find transaction based on its generation number, bump its reference counter,
591
* so that none could free it under us, drop from the trees and lists and
592
* drop reference counter. When it hits zero (when all destinations replied
593
* and all timeout handled by async scanning code), completion will be called
594
* and transaction will be freed.
596
static int pohmelfs_transaction_response(struct netfs_state *st)
598
struct netfs_trans_dst *dst;
599
struct netfs_trans *t = NULL;
600
struct netfs_cmd *cmd = &st->cmd;
601
short err = (signed)cmd->ext;
603
mutex_lock(&st->trans_lock);
604
dst = netfs_trans_search(st, cmd->start);
606
netfs_trans_remove_nolock(dst, st);
609
mutex_unlock(&st->trans_lock);
612
printk("%s: failed to find transaction: start: %llu: id: %llu, size: %u, ext: %u.\n",
613
__func__, cmd->start, cmd->id, cmd->size, cmd->ext);
619
netfs_trans_drop_dst_nostate(dst);
622
wake_up(&st->psb->wait);
627
* Inode metadata cache coherency message.
629
static int pohmelfs_page_cache_response(struct netfs_state *st)
631
struct netfs_cmd *cmd = &st->cmd;
634
dprintk("%s: st: %p, id: %llu, start: %llu, size: %u.\n", __func__, st, cmd->id, cmd->start, cmd->size);
636
inode = ilookup(st->psb->sb, cmd->id);
638
printk("%s: failed to find inode: id: %llu.\n", __func__, cmd->id);
642
set_bit(NETFS_INODE_NEED_FLUSH, &POHMELFS_I(inode)->state);
643
pohmelfs_put_inode(POHMELFS_I(inode));
649
* Root capabilities response: export statistics
650
* like used and available size, number of files and dirs,
653
static int pohmelfs_root_cap_response(struct netfs_state *st)
655
struct netfs_cmd *cmd = &st->cmd;
656
struct netfs_root_capabilities *cap;
657
struct pohmelfs_sb *psb = st->psb;
659
if (cmd->size != sizeof(struct netfs_root_capabilities)) {
667
netfs_convert_root_capabilities(cap);
669
if (psb->total_size < cap->used + cap->avail)
670
psb->total_size = cap->used + cap->avail;
672
psb->avail_size = cap->avail;
673
psb->state_flags = cap->flags;
675
if (psb->state_flags & POHMELFS_FLAGS_RO) {
676
psb->sb->s_flags |= MS_RDONLY;
677
printk(KERN_INFO "Mounting POHMELFS (%d) read-only.\n", psb->idx);
680
if (psb->state_flags & POHMELFS_FLAGS_XATTR)
681
printk(KERN_INFO "Mounting POHMELFS (%d) "
682
"with extended attributes support.\n", psb->idx);
684
if (atomic_long_read(&psb->total_inodes) <= 1)
685
atomic_long_set(&psb->total_inodes, cap->nr_files);
687
dprintk("%s: total: %llu, avail: %llu, flags: %llx, inodes: %llu.\n",
688
__func__, psb->total_size, psb->avail_size, psb->state_flags, cap->nr_files);
696
* Crypto capabilities of the server, where it says that
697
* it supports or does not requested hash/cipher algorithms.
699
static int pohmelfs_crypto_cap_response(struct netfs_state *st)
701
struct netfs_cmd *cmd = &st->cmd;
702
struct netfs_crypto_capabilities *cap;
703
struct pohmelfs_sb *psb = st->psb;
706
if (cmd->size != sizeof(struct netfs_crypto_capabilities)) {
714
dprintk("%s: cipher '%s': %s, hash: '%s': %s.\n",
716
psb->cipher_string, (cap->cipher_strlen) ? "SUPPORTED" : "NOT SUPPORTED",
717
psb->hash_string, (cap->hash_strlen) ? "SUPPORTED" : "NOT SUPPORTED");
719
if (!cap->hash_strlen) {
720
if (psb->hash_strlen && psb->crypto_fail_unsupported)
722
psb->hash_strlen = 0;
723
kfree(psb->hash_string);
724
psb->hash_string = NULL;
727
if (!cap->cipher_strlen) {
728
if (psb->cipher_strlen && psb->crypto_fail_unsupported)
730
psb->cipher_strlen = 0;
731
kfree(psb->cipher_string);
732
psb->cipher_string = NULL;
739
* Capabilities handshake response.
741
static int pohmelfs_capabilities_response(struct netfs_state *st)
743
struct netfs_cmd *cmd = &st->cmd;
746
err = pohmelfs_data_recv(st, st->data, cmd->size);
751
case POHMELFS_CRYPTO_CAPABILITIES:
752
return pohmelfs_crypto_cap_response(st);
753
case POHMELFS_ROOT_CAPABILITIES:
754
return pohmelfs_root_cap_response(st);
762
* Receiving extended attribute.
763
* Does not work properly if received size is more than requested one,
764
* it should not happen with current request/reply model though.
766
static int pohmelfs_getxattr_response(struct netfs_state *st)
768
struct pohmelfs_sb *psb = st->psb;
769
struct netfs_cmd *cmd = &st->cmd;
770
struct pohmelfs_mcache *m;
771
short error = (signed short)cmd->ext, err;
772
unsigned int sz, total_size;
774
m = pohmelfs_mcache_search(psb, cmd->id);
776
dprintk("%s: id: %llu, gen: %llu, err: %d.\n",
777
__func__, cmd->id, (m) ? m->gen : 0, error);
780
printk("%s: failed to find getxattr cache entry: id: %llu.\n", __func__, cmd->id);
785
sz = min_t(unsigned int, cmd->size, m->size);
786
err = pohmelfs_data_recv_and_check(st, m->data, sz);
793
total_size = cmd->size - sz;
796
sz = min(total_size, st->size);
798
err = pohmelfs_data_recv_and_check(st, st->data, sz);
810
complete(&m->complete);
811
pohmelfs_mcache_put(psb, m);
816
int pohmelfs_data_lock_response(struct netfs_state *st)
818
struct pohmelfs_sb *psb = st->psb;
819
struct netfs_cmd *cmd = &st->cmd;
820
struct pohmelfs_mcache *m;
821
short err = (signed short)cmd->ext;
824
m = pohmelfs_mcache_search(psb, id);
826
dprintk("%s: id: %llu, gen: %llu, err: %d.\n",
827
__func__, cmd->id, (m) ? m->gen : 0, err);
830
pohmelfs_data_recv(st, st->data, cmd->size);
831
printk("%s: failed to find data lock response: id: %llu.\n", __func__, cmd->id);
836
err = pohmelfs_data_recv_and_check(st, &m->info, cmd->size);
839
complete(&m->complete);
840
pohmelfs_mcache_put(psb, m);
845
static void __inline__ netfs_state_reset(struct netfs_state *st)
847
netfs_state_lock_send(st);
848
netfs_state_exit(st);
849
netfs_state_init(st);
850
netfs_state_unlock_send(st);
854
* Main receiving function, called from dedicated kernel thread.
856
static int pohmelfs_recv(void *data)
859
struct netfs_state *st = data;
860
struct netfs_cmd *cmd = &st->cmd;
862
while (!kthread_should_stop()) {
864
* If socket will be reset after this statement, then
865
* pohmelfs_data_recv() will just fail and loop will
866
* start again, so it can be done without any locks.
868
* st->read_socket is needed to prevents state machine
869
* breaking between this data reading and subsequent one
870
* in protocol specific functions during connection reset.
871
* In case of reset we have to read next command and do
872
* not expect data for old command to magically appear in
875
st->read_socket = st->socket;
876
err = pohmelfs_data_recv(st, cmd, sizeof(struct netfs_cmd));
882
netfs_convert_cmd(cmd);
884
dprintk("%s: cmd: %u, id: %llu, start: %llu, size: %u, "
885
"ext: %u, csize: %u, cpad: %u.\n",
886
__func__, cmd->cmd, cmd->id, cmd->start,
887
cmd->size, cmd->ext, cmd->csize, cmd->cpad);
890
struct pohmelfs_crypto_engine *e = &st->eng;
892
if (unlikely(cmd->csize > e->size/2)) {
893
netfs_state_reset(st);
897
if (e->hash && unlikely(cmd->csize != st->psb->crypto_attached_size)) {
898
dprintk("%s: cmd: cmd: %u, id: %llu, start: %llu, size: %u, "
899
"csize: %u != digest size %u.\n",
900
__func__, cmd->cmd, cmd->id, cmd->start, cmd->size,
901
cmd->csize, st->psb->crypto_attached_size);
902
netfs_state_reset(st);
906
err = pohmelfs_data_recv(st, e->data, cmd->csize);
908
netfs_state_reset(st);
912
#ifdef CONFIG_POHMELFS_DEBUG
915
unsigned char *hash = e->data;
917
dprintk("%s: received hash: ", __func__);
918
for (i = 0; i < cmd->csize; ++i)
919
printk("%02x ", hash[i]);
924
cmd->size -= cmd->csize;
928
* This should catch protocol breakage and random garbage instead of commands.
930
if (unlikely((cmd->size > st->size) && (cmd->cmd != NETFS_XATTR_GET))) {
931
netfs_state_reset(st);
936
case NETFS_READ_PAGE:
937
err = pohmelfs_read_page_response(st);
940
err = pohmelfs_readdir_response(st);
943
err = pohmelfs_lookup_response(st);
946
err = pohmelfs_create_response(st);
949
err = pohmelfs_remove_response(st);
952
err = pohmelfs_transaction_response(st);
954
case NETFS_PAGE_CACHE:
955
err = pohmelfs_page_cache_response(st);
957
case NETFS_CAPABILITIES:
958
err = pohmelfs_capabilities_response(st);
961
err = pohmelfs_data_lock_response(st);
963
case NETFS_XATTR_GET:
964
err = pohmelfs_getxattr_response(st);
967
printk("%s: wrong cmd: %u, id: %llu, start: %llu, size: %u, ext: %u.\n",
968
__func__, cmd->cmd, cmd->id, cmd->start, cmd->size, cmd->ext);
969
netfs_state_reset(st);
974
while (!kthread_should_stop())
975
schedule_timeout_uninterruptible(msecs_to_jiffies(10));
980
int netfs_state_init(struct netfs_state *st)
983
struct pohmelfs_ctl *ctl = &st->ctl;
985
err = sock_create(ctl->addr.sa_family, ctl->type, ctl->proto, &st->socket);
987
printk("%s: failed to create a socket: family: %d, type: %d, proto: %d, err: %d.\n",
988
__func__, ctl->addr.sa_family, ctl->type, ctl->proto, err);
992
st->socket->sk->sk_allocation = GFP_NOIO;
993
st->socket->sk->sk_sndtimeo = st->socket->sk->sk_rcvtimeo = msecs_to_jiffies(60000);
995
err = kernel_connect(st->socket, (struct sockaddr *)&ctl->addr, ctl->addrlen, 0);
997
printk("%s: failed to connect to server: idx: %u, err: %d.\n",
998
__func__, st->psb->idx, err);
999
goto err_out_release;
1001
st->socket->sk->sk_sndtimeo = st->socket->sk->sk_rcvtimeo = msecs_to_jiffies(60000);
1003
err = netfs_poll_init(st);
1005
goto err_out_release;
1007
if (st->socket->ops->family == AF_INET) {
1008
struct sockaddr_in *sin = (struct sockaddr_in *)&ctl->addr;
1009
printk(KERN_INFO "%s: (re)connected to peer %pi4:%d.\n", __func__,
1010
&sin->sin_addr.s_addr, ntohs(sin->sin_port));
1011
} else if (st->socket->ops->family == AF_INET6) {
1012
struct sockaddr_in6 *sin = (struct sockaddr_in6 *)&ctl->addr;
1013
printk(KERN_INFO "%s: (re)connected to peer %pi6:%d", __func__,
1014
&sin->sin6_addr, ntohs(sin->sin6_port));
1020
sock_release(st->socket);
1026
void netfs_state_exit(struct netfs_state *st)
1029
netfs_poll_exit(st);
1030
st->socket->ops->shutdown(st->socket, 2);
1032
if (st->socket->ops->family == AF_INET) {
1033
struct sockaddr_in *sin = (struct sockaddr_in *)&st->ctl.addr;
1034
printk(KERN_INFO "%s: disconnected from peer %pi4:%d.\n", __func__,
1035
&sin->sin_addr.s_addr, ntohs(sin->sin_port));
1036
} else if (st->socket->ops->family == AF_INET6) {
1037
struct sockaddr_in6 *sin = (struct sockaddr_in6 *)&st->ctl.addr;
1038
printk(KERN_INFO "%s: disconnected from peer %pi6:%d", __func__,
1039
&sin->sin6_addr, ntohs(sin->sin6_port));
1042
sock_release(st->socket);
1044
st->read_socket = NULL;
1049
int pohmelfs_state_init_one(struct pohmelfs_sb *psb, struct pohmelfs_config *conf)
1051
struct netfs_state *st = &conf->state;
1054
mutex_init(&st->__state_lock);
1055
mutex_init(&st->__state_send_lock);
1056
init_waitqueue_head(&st->thread_wait);
1059
st->trans_root = RB_ROOT;
1060
mutex_init(&st->trans_lock);
1062
st->size = psb->trans_data_size;
1063
st->data = kmalloc(st->size, GFP_KERNEL);
1067
if (psb->perform_crypto) {
1068
err = pohmelfs_crypto_engine_init(&st->eng, psb);
1070
goto err_out_free_data;
1073
err = netfs_state_init(st);
1075
goto err_out_free_engine;
1077
st->thread = kthread_run(pohmelfs_recv, st, "pohmelfs/%u", psb->idx);
1078
if (IS_ERR(st->thread)) {
1079
err = PTR_ERR(st->thread);
1080
goto err_out_netfs_exit;
1083
if (!psb->active_state)
1084
psb->active_state = conf;
1086
dprintk("%s: conf: %p, st: %p, socket: %p.\n",
1087
__func__, conf, st, st->socket);
1091
netfs_state_exit(st);
1092
err_out_free_engine:
1093
pohmelfs_crypto_engine_exit(&st->eng);
1101
void pohmelfs_state_flush_transactions(struct netfs_state *st)
1103
struct rb_node *rb_node;
1104
struct netfs_trans_dst *dst;
1106
mutex_lock(&st->trans_lock);
1107
for (rb_node = rb_first(&st->trans_root); rb_node; ) {
1108
dst = rb_entry(rb_node, struct netfs_trans_dst, state_entry);
1109
rb_node = rb_next(rb_node);
1111
dst->trans->result = -EINVAL;
1112
netfs_trans_remove_nolock(dst, st);
1113
netfs_trans_drop_dst_nostate(dst);
1115
mutex_unlock(&st->trans_lock);
1118
static void pohmelfs_state_exit_one(struct pohmelfs_config *c)
1120
struct netfs_state *st = &c->state;
1122
dprintk("%s: exiting, st: %p.\n", __func__, st);
1124
kthread_stop(st->thread);
1128
netfs_state_lock_send(st);
1129
netfs_state_exit(st);
1130
netfs_state_unlock_send(st);
1132
pohmelfs_state_flush_transactions(st);
1134
pohmelfs_crypto_engine_exit(&st->eng);
1141
* Initialize network stack. It searches for given ID in global
1142
* configuration table, this contains information of the remote server
1143
* (address (any supported by socket interface) and port, protocol and so on).
1145
int pohmelfs_state_init(struct pohmelfs_sb *psb)
1149
err = pohmelfs_copy_config(psb);
1151
pohmelfs_state_exit(psb);
1158
void pohmelfs_state_exit(struct pohmelfs_sb *psb)
1160
struct pohmelfs_config *c, *tmp;
1162
list_for_each_entry_safe(c, tmp, &psb->state_list, config_entry) {
1163
list_del(&c->config_entry);
1164
pohmelfs_state_exit_one(c);
1168
void pohmelfs_switch_active(struct pohmelfs_sb *psb)
1170
struct pohmelfs_config *c = psb->active_state;
1172
if (!list_empty(&psb->state_list)) {
1173
if (c->config_entry.next != &psb->state_list) {
1174
psb->active_state = list_entry(c->config_entry.next,
1175
struct pohmelfs_config, config_entry);
1177
psb->active_state = list_entry(psb->state_list.next,
1178
struct pohmelfs_config, config_entry);
1181
dprintk("%s: empty: %d, active %p -> %p.\n",
1182
__func__, list_empty(&psb->state_list), c,
1185
psb->active_state = NULL;
1188
void pohmelfs_check_states(struct pohmelfs_sb *psb)
1190
struct pohmelfs_config *c, *tmp;
1191
LIST_HEAD(delete_list);
1193
mutex_lock(&psb->state_lock);
1194
list_for_each_entry_safe(c, tmp, &psb->state_list, config_entry) {
1195
if (pohmelfs_config_check(c, psb->idx)) {
1197
if (psb->active_state == c)
1198
pohmelfs_switch_active(psb);
1199
list_move(&c->config_entry, &delete_list);
1202
pohmelfs_copy_config(psb);
1203
mutex_unlock(&psb->state_lock);
1205
list_for_each_entry_safe(c, tmp, &delete_list, config_entry) {
1206
list_del(&c->config_entry);
1207
pohmelfs_state_exit_one(c);