![Ruslan Pisarev](/assets/img/avatar_default.png)
This is a patch to the net.c file that fixed up a TAB and spaces Errors found by the checkpatch.pl tools, like ERROR: switch and case should be at the same indent and spaces required around that '=' (ctx:VxV) Signed-off-by: Ruslan Pisarev <ruslan@rpisarev.org.ua> Acked-by: Evgeniy Polyakov <zbr@ioremap.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
1210 lines
29 KiB
C
1210 lines
29 KiB
C
/*
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* 2007+ Copyright (c) Evgeniy Polyakov <zbr@ioremap.net>
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/fsnotify.h>
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#include <linux/jhash.h>
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#include <linux/in.h>
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#include <linux/in6.h>
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#include <linux/kthread.h>
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#include <linux/pagemap.h>
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#include <linux/poll.h>
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#include <linux/slab.h>
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#include <linux/swap.h>
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#include <linux/syscalls.h>
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#include <linux/vmalloc.h>
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#include "netfs.h"
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/*
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* Async machinery lives here.
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* All commands being sent to server do _not_ require sync reply,
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* instead, if it is really needed, like readdir or readpage, caller
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* sleeps waiting for data, which will be placed into provided buffer
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* and caller will be awakened.
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*
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* Every command response can come without some listener. For example
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* readdir response will add new objects into cache without appropriate
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* request from userspace. This is used in cache coherency.
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*
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* If object is not found for given data, it is discarded.
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*
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* All requests are received by dedicated kernel thread.
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*/
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/*
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* Basic network sending/receiving functions.
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* Blocked mode is used.
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*/
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static int netfs_data_recv(struct netfs_state *st, void *buf, u64 size)
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{
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struct msghdr msg;
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struct kvec iov;
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int err;
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BUG_ON(!size);
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iov.iov_base = buf;
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iov.iov_len = size;
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msg.msg_iov = (struct iovec *)&iov;
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msg.msg_iovlen = 1;
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msg.msg_name = NULL;
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msg.msg_namelen = 0;
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msg.msg_control = NULL;
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msg.msg_controllen = 0;
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msg.msg_flags = MSG_DONTWAIT;
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err = kernel_recvmsg(st->socket, &msg, &iov, 1, iov.iov_len,
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msg.msg_flags);
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if (err <= 0) {
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printk("%s: failed to recv data: size: %llu, err: %d.\n", __func__, size, err);
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if (err == 0)
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err = -ECONNRESET;
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}
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return err;
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}
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static int pohmelfs_data_recv(struct netfs_state *st, void *data, unsigned int size)
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{
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unsigned int revents = 0;
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unsigned int err_mask = POLLERR | POLLHUP | POLLRDHUP;
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unsigned int mask = err_mask | POLLIN;
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int err = 0;
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while (size && !err) {
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revents = netfs_state_poll(st);
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if (!(revents & mask)) {
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DEFINE_WAIT(wait);
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for (;;) {
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prepare_to_wait(&st->thread_wait, &wait, TASK_INTERRUPTIBLE);
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if (kthread_should_stop())
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break;
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revents = netfs_state_poll(st);
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if (revents & mask)
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break;
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if (signal_pending(current))
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break;
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schedule();
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continue;
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}
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finish_wait(&st->thread_wait, &wait);
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}
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err = 0;
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netfs_state_lock(st);
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if (st->socket && (st->read_socket == st->socket) && (revents & POLLIN)) {
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err = netfs_data_recv(st, data, size);
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if (err > 0) {
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data += err;
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size -= err;
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err = 0;
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} else if (err == 0)
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err = -ECONNRESET;
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}
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if (revents & err_mask) {
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printk("%s: revents: %x, socket: %p, size: %u, err: %d.\n",
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__func__, revents, st->socket, size, err);
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err = -ECONNRESET;
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}
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netfs_state_unlock(st);
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if (err < 0) {
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if (netfs_state_trylock_send(st)) {
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netfs_state_exit(st);
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err = netfs_state_init(st);
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if (!err)
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err = -EAGAIN;
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netfs_state_unlock_send(st);
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} else {
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st->need_reset = 1;
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}
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}
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if (kthread_should_stop())
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err = -ENODEV;
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if (err)
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printk("%s: socket: %p, read_socket: %p, revents: %x, rev_error: %d, "
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"should_stop: %d, size: %u, err: %d.\n",
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__func__, st->socket, st->read_socket,
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revents, revents & err_mask, kthread_should_stop(), size, err);
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}
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return err;
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}
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int pohmelfs_data_recv_and_check(struct netfs_state *st, void *data, unsigned int size)
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{
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struct netfs_cmd *cmd = &st->cmd;
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int err;
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err = pohmelfs_data_recv(st, data, size);
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if (err)
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return err;
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return pohmelfs_crypto_process_input_data(&st->eng, cmd->iv, data, NULL, size);
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}
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/*
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* Polling machinery.
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*/
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struct netfs_poll_helper {
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poll_table pt;
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struct netfs_state *st;
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};
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static int netfs_queue_wake(wait_queue_t *wait, unsigned mode, int sync, void *key)
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{
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struct netfs_state *st = container_of(wait, struct netfs_state, wait);
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wake_up(&st->thread_wait);
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return 1;
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}
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static void netfs_queue_func(struct file *file, wait_queue_head_t *whead,
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poll_table *pt)
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{
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struct netfs_state *st = container_of(pt, struct netfs_poll_helper, pt)->st;
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st->whead = whead;
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init_waitqueue_func_entry(&st->wait, netfs_queue_wake);
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add_wait_queue(whead, &st->wait);
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}
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static void netfs_poll_exit(struct netfs_state *st)
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{
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if (st->whead) {
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remove_wait_queue(st->whead, &st->wait);
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st->whead = NULL;
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}
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}
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static int netfs_poll_init(struct netfs_state *st)
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{
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struct netfs_poll_helper ph;
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ph.st = st;
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init_poll_funcptr(&ph.pt, &netfs_queue_func);
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st->socket->ops->poll(NULL, st->socket, &ph.pt);
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return 0;
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}
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/*
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* Get response for readpage command. We search inode and page in its mapping
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* and copy data into. If it was async request, then we queue page into shared
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* data and wakeup listener, who will copy it to userspace.
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*
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* There is a work in progress of allowing to call copy_to_user() directly from
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* async receiving kernel thread.
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*/
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static int pohmelfs_read_page_response(struct netfs_state *st)
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{
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struct pohmelfs_sb *psb = st->psb;
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struct netfs_cmd *cmd = &st->cmd;
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struct inode *inode;
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struct page *page;
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int err = 0;
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if (cmd->size > PAGE_CACHE_SIZE) {
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err = -EINVAL;
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goto err_out_exit;
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}
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inode = ilookup(st->psb->sb, cmd->id);
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if (!inode) {
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printk("%s: failed to find inode: id: %llu.\n", __func__, cmd->id);
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err = -ENOENT;
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goto err_out_exit;
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}
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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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while (cmd->size) {
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unsigned int sz = min(cmd->size, st->size);
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err = pohmelfs_data_recv(st, st->data, sz);
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if (err)
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break;
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cmd->size -= sz;
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}
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err = -ENODEV;
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if (page)
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goto err_out_page_put;
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goto err_out_put;
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}
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if (cmd->size) {
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void *addr;
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addr = kmap(page);
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err = pohmelfs_data_recv(st, addr, cmd->size);
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kunmap(page);
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if (err)
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goto err_out_page_unlock;
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}
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dprintk("%s: page: %p, start: %llu, size: %u, locked: %d.\n",
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__func__, page, cmd->start, cmd->size, PageLocked(page));
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SetPageChecked(page);
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if ((psb->hash_string || psb->cipher_string) && psb->perform_crypto && cmd->size) {
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err = pohmelfs_crypto_process_input_page(&st->eng, page, cmd->size, cmd->iv);
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if (err < 0)
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goto err_out_page_unlock;
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} else {
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SetPageUptodate(page);
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unlock_page(page);
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page_cache_release(page);
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}
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pohmelfs_put_inode(POHMELFS_I(inode));
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wake_up(&st->psb->wait);
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return 0;
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err_out_page_unlock:
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SetPageError(page);
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unlock_page(page);
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err_out_page_put:
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page_cache_release(page);
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err_out_put:
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pohmelfs_put_inode(POHMELFS_I(inode));
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err_out_exit:
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wake_up(&st->psb->wait);
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return err;
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}
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static int pohmelfs_check_name(struct pohmelfs_inode *parent, struct qstr *str,
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struct netfs_inode_info *info)
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{
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struct inode *inode;
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struct pohmelfs_name *n;
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int err = 0;
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u64 ino = 0;
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mutex_lock(&parent->offset_lock);
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n = pohmelfs_search_hash(parent, str->hash);
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if (n)
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ino = n->ino;
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mutex_unlock(&parent->offset_lock);
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if (!ino)
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goto out;
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inode = ilookup(parent->vfs_inode.i_sb, ino);
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if (!inode)
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goto out;
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dprintk("%s: parent: %llu, inode: %llu.\n", __func__, parent->ino, ino);
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pohmelfs_fill_inode(inode, info);
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pohmelfs_put_inode(POHMELFS_I(inode));
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err = -EEXIST;
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out:
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return err;
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}
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/*
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* Readdir response from server. If special field is set, we wakeup
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* listener (readdir() call), which will copy data to userspace.
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*/
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static int pohmelfs_readdir_response(struct netfs_state *st)
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{
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struct inode *inode;
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struct netfs_cmd *cmd = &st->cmd;
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struct netfs_inode_info *info;
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struct pohmelfs_inode *parent = NULL, *npi;
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int err = 0, last = cmd->ext;
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struct qstr str;
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if (cmd->size > st->size)
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return -EINVAL;
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inode = ilookup(st->psb->sb, cmd->id);
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if (!inode) {
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printk("%s: failed to find inode: id: %llu.\n", __func__, cmd->id);
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return -ENOENT;
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}
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parent = POHMELFS_I(inode);
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if (!cmd->size && cmd->start) {
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err = -cmd->start;
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goto out;
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}
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if (cmd->size) {
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char *name;
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err = pohmelfs_data_recv_and_check(st, st->data, cmd->size);
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if (err)
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goto err_out_put;
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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;
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name[str.len] = 0;
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str.name = name;
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str.hash = jhash(str.name, str.len, 0);
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netfs_convert_inode_info(info);
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if (parent) {
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err = pohmelfs_check_name(parent, &str, info);
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if (err) {
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if (err == -EEXIST)
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err = 0;
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goto out;
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}
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}
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info->ino = cmd->start;
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if (!info->ino)
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info->ino = pohmelfs_new_ino(st->psb);
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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,
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info->mode);
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npi = pohmelfs_new_inode(st->psb, parent, &str, info, 0);
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if (IS_ERR(npi)) {
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err = PTR_ERR(npi);
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if (err != -EEXIST)
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goto err_out_put;
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} else {
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struct dentry *dentry, *alias, *pd;
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set_bit(NETFS_INODE_REMOTE_SYNCED, &npi->state);
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clear_bit(NETFS_INODE_OWNED, &npi->state);
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pd = d_find_alias(&parent->vfs_inode);
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if (pd) {
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str.hash = full_name_hash(str.name, str.len);
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dentry = d_alloc(pd, &str);
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if (dentry) {
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alias = d_materialise_unique(dentry, &npi->vfs_inode);
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if (alias)
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dput(dentry);
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}
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dput(dentry);
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dput(pd);
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}
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}
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}
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out:
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if (last) {
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set_bit(NETFS_INODE_REMOTE_DIR_SYNCED, &parent->state);
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set_bit(NETFS_INODE_REMOTE_SYNCED, &parent->state);
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wake_up(&st->psb->wait);
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}
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pohmelfs_put_inode(parent);
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return err;
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|
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err_out_put:
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clear_bit(NETFS_INODE_REMOTE_DIR_SYNCED, &parent->state);
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printk("%s: parent: %llu, ino: %llu, cmd_id: %llu.\n", __func__, parent->ino, cmd->start, cmd->id);
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pohmelfs_put_inode(parent);
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wake_up(&st->psb->wait);
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return err;
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}
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|
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/*
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* Lookup command response.
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* It searches for inode to be looked at (if it exists) and substitutes
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* its inode information (size, permission, mode and so on), if inode does
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* not exist, new one will be created and inserted into caches.
|
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*/
|
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static int pohmelfs_lookup_response(struct netfs_state *st)
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{
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struct inode *inode = NULL;
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struct netfs_cmd *cmd = &st->cmd;
|
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struct netfs_inode_info *info;
|
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struct pohmelfs_inode *parent = NULL, *npi;
|
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int err = -EINVAL;
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char *name;
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|
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inode = ilookup(st->psb->sb, cmd->id);
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if (!inode) {
|
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printk("%s: lookup response: id: %llu, start: %llu, size: %u.\n",
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__func__, cmd->id, cmd->start, cmd->size);
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err = -ENOENT;
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goto err_out_exit;
|
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}
|
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parent = POHMELFS_I(inode);
|
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|
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if (!cmd->size) {
|
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err = -cmd->start;
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goto err_out_put;
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}
|
|
|
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if (cmd->size < sizeof(struct netfs_inode_info)) {
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printk("%s: broken lookup response: id: %llu, start: %llu, size: %u.\n",
|
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__func__, cmd->id, cmd->start, cmd->size);
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err = -EINVAL;
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goto err_out_put;
|
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}
|
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|
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err = pohmelfs_data_recv_and_check(st, st->data, cmd->size);
|
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if (err)
|
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goto err_out_put;
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|
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info = (struct netfs_inode_info *)(st->data);
|
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name = (char *)(info + 1);
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|
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netfs_convert_inode_info(info);
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|
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info->ino = cmd->start;
|
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if (!info->ino)
|
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info->ino = pohmelfs_new_ino(st->psb);
|
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|
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dprintk("%s: parent: %llu, ino: %llu, name: '%s', start: %llu.\n",
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__func__, parent->ino, info->ino, name, cmd->start);
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|
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if (cmd->start)
|
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npi = pohmelfs_new_inode(st->psb, parent, NULL, info, 0);
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else {
|
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struct qstr str;
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|
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str.name = name;
|
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str.len = cmd->size - sizeof(struct netfs_inode_info) - 1 - cmd->cpad;
|
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str.hash = jhash(name, str.len, 0);
|
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|
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npi = pohmelfs_new_inode(st->psb, parent, &str, info, 0);
|
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}
|
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if (IS_ERR(npi)) {
|
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err = PTR_ERR(npi);
|
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|
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if (err != -EEXIST)
|
|
goto err_out_put;
|
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} else {
|
|
set_bit(NETFS_INODE_REMOTE_SYNCED, &npi->state);
|
|
clear_bit(NETFS_INODE_OWNED, &npi->state);
|
|
}
|
|
|
|
clear_bit(NETFS_COMMAND_PENDING, &parent->state);
|
|
pohmelfs_put_inode(parent);
|
|
|
|
wake_up(&st->psb->wait);
|
|
|
|
return 0;
|
|
|
|
err_out_put:
|
|
pohmelfs_put_inode(parent);
|
|
err_out_exit:
|
|
clear_bit(NETFS_COMMAND_PENDING, &parent->state);
|
|
wake_up(&st->psb->wait);
|
|
printk("%s: inode: %p, id: %llu, start: %llu, size: %u, err: %d.\n",
|
|
__func__, inode, cmd->id, cmd->start, cmd->size, err);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Create response, just marks local inode as 'created', so that writeback
|
|
* for any of its children (or own) would not try to sync it again.
|
|
*/
|
|
static int pohmelfs_create_response(struct netfs_state *st)
|
|
{
|
|
struct inode *inode;
|
|
struct netfs_cmd *cmd = &st->cmd;
|
|
struct pohmelfs_inode *pi;
|
|
|
|
inode = ilookup(st->psb->sb, cmd->id);
|
|
if (!inode) {
|
|
printk("%s: failed to find inode: id: %llu, start: %llu.\n",
|
|
__func__, cmd->id, cmd->start);
|
|
goto err_out_exit;
|
|
}
|
|
|
|
pi = POHMELFS_I(inode);
|
|
|
|
/*
|
|
* To lock or not to lock?
|
|
* We actually do not care if it races...
|
|
*/
|
|
if (cmd->start)
|
|
make_bad_inode(inode);
|
|
set_bit(NETFS_INODE_REMOTE_SYNCED, &pi->state);
|
|
|
|
pohmelfs_put_inode(pi);
|
|
|
|
wake_up(&st->psb->wait);
|
|
return 0;
|
|
|
|
err_out_exit:
|
|
wake_up(&st->psb->wait);
|
|
return -ENOENT;
|
|
}
|
|
|
|
/*
|
|
* Object remove response. Just says that remove request has been received.
|
|
* Used in cache coherency protocol.
|
|
*/
|
|
static int pohmelfs_remove_response(struct netfs_state *st)
|
|
{
|
|
struct netfs_cmd *cmd = &st->cmd;
|
|
int err;
|
|
|
|
err = pohmelfs_data_recv_and_check(st, st->data, cmd->size);
|
|
if (err)
|
|
return err;
|
|
|
|
dprintk("%s: parent: %llu, path: '%s'.\n", __func__, cmd->id, (char *)st->data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Transaction reply processing.
|
|
*
|
|
* Find transaction based on its generation number, bump its reference counter,
|
|
* so that none could free it under us, drop from the trees and lists and
|
|
* drop reference counter. When it hits zero (when all destinations replied
|
|
* and all timeout handled by async scanning code), completion will be called
|
|
* and transaction will be freed.
|
|
*/
|
|
static int pohmelfs_transaction_response(struct netfs_state *st)
|
|
{
|
|
struct netfs_trans_dst *dst;
|
|
struct netfs_trans *t = NULL;
|
|
struct netfs_cmd *cmd = &st->cmd;
|
|
short err = (signed)cmd->ext;
|
|
|
|
mutex_lock(&st->trans_lock);
|
|
dst = netfs_trans_search(st, cmd->start);
|
|
if (dst) {
|
|
netfs_trans_remove_nolock(dst, st);
|
|
t = dst->trans;
|
|
}
|
|
mutex_unlock(&st->trans_lock);
|
|
|
|
if (!t) {
|
|
printk("%s: failed to find transaction: start: %llu: id: %llu, size: %u, ext: %u.\n",
|
|
__func__, cmd->start, cmd->id, cmd->size, cmd->ext);
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
t->result = err;
|
|
netfs_trans_drop_dst_nostate(dst);
|
|
|
|
out:
|
|
wake_up(&st->psb->wait);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Inode metadata cache coherency message.
|
|
*/
|
|
static int pohmelfs_page_cache_response(struct netfs_state *st)
|
|
{
|
|
struct netfs_cmd *cmd = &st->cmd;
|
|
struct inode *inode;
|
|
|
|
dprintk("%s: st: %p, id: %llu, start: %llu, size: %u.\n", __func__, st, cmd->id, cmd->start, cmd->size);
|
|
|
|
inode = ilookup(st->psb->sb, cmd->id);
|
|
if (!inode) {
|
|
printk("%s: failed to find inode: id: %llu.\n", __func__, cmd->id);
|
|
return -ENOENT;
|
|
}
|
|
|
|
set_bit(NETFS_INODE_NEED_FLUSH, &POHMELFS_I(inode)->state);
|
|
pohmelfs_put_inode(POHMELFS_I(inode));
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Root capabilities response: export statistics
|
|
* like used and available size, number of files and dirs,
|
|
* permissions.
|
|
*/
|
|
static int pohmelfs_root_cap_response(struct netfs_state *st)
|
|
{
|
|
struct netfs_cmd *cmd = &st->cmd;
|
|
struct netfs_root_capabilities *cap;
|
|
struct pohmelfs_sb *psb = st->psb;
|
|
|
|
if (cmd->size != sizeof(struct netfs_root_capabilities)) {
|
|
psb->flags = EPROTO;
|
|
wake_up(&psb->wait);
|
|
return -EPROTO;
|
|
}
|
|
|
|
cap = st->data;
|
|
|
|
netfs_convert_root_capabilities(cap);
|
|
|
|
if (psb->total_size < cap->used + cap->avail)
|
|
psb->total_size = cap->used + cap->avail;
|
|
if (cap->avail)
|
|
psb->avail_size = cap->avail;
|
|
psb->state_flags = cap->flags;
|
|
|
|
if (psb->state_flags & POHMELFS_FLAGS_RO) {
|
|
psb->sb->s_flags |= MS_RDONLY;
|
|
printk(KERN_INFO "Mounting POHMELFS (%d) read-only.\n", psb->idx);
|
|
}
|
|
|
|
if (psb->state_flags & POHMELFS_FLAGS_XATTR)
|
|
printk(KERN_INFO "Mounting POHMELFS (%d) "
|
|
"with extended attributes support.\n", psb->idx);
|
|
|
|
if (atomic_long_read(&psb->total_inodes) <= 1)
|
|
atomic_long_set(&psb->total_inodes, cap->nr_files);
|
|
|
|
dprintk("%s: total: %llu, avail: %llu, flags: %llx, inodes: %llu.\n",
|
|
__func__, psb->total_size, psb->avail_size, psb->state_flags, cap->nr_files);
|
|
|
|
psb->flags = 0;
|
|
wake_up(&psb->wait);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Crypto capabilities of the server, where it says that
|
|
* it supports or does not requested hash/cipher algorithms.
|
|
*/
|
|
static int pohmelfs_crypto_cap_response(struct netfs_state *st)
|
|
{
|
|
struct netfs_cmd *cmd = &st->cmd;
|
|
struct netfs_crypto_capabilities *cap;
|
|
struct pohmelfs_sb *psb = st->psb;
|
|
int err = 0;
|
|
|
|
if (cmd->size != sizeof(struct netfs_crypto_capabilities)) {
|
|
psb->flags = EPROTO;
|
|
wake_up(&psb->wait);
|
|
return -EPROTO;
|
|
}
|
|
|
|
cap = st->data;
|
|
|
|
dprintk("%s: cipher '%s': %s, hash: '%s': %s.\n",
|
|
__func__,
|
|
psb->cipher_string, (cap->cipher_strlen) ? "SUPPORTED" : "NOT SUPPORTED",
|
|
psb->hash_string, (cap->hash_strlen) ? "SUPPORTED" : "NOT SUPPORTED");
|
|
|
|
if (!cap->hash_strlen) {
|
|
if (psb->hash_strlen && psb->crypto_fail_unsupported)
|
|
err = -ENOTSUPP;
|
|
psb->hash_strlen = 0;
|
|
kfree(psb->hash_string);
|
|
psb->hash_string = NULL;
|
|
}
|
|
|
|
if (!cap->cipher_strlen) {
|
|
if (psb->cipher_strlen && psb->crypto_fail_unsupported)
|
|
err = -ENOTSUPP;
|
|
psb->cipher_strlen = 0;
|
|
kfree(psb->cipher_string);
|
|
psb->cipher_string = NULL;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Capabilities handshake response.
|
|
*/
|
|
static int pohmelfs_capabilities_response(struct netfs_state *st)
|
|
{
|
|
struct netfs_cmd *cmd = &st->cmd;
|
|
int err = 0;
|
|
|
|
err = pohmelfs_data_recv(st, st->data, cmd->size);
|
|
if (err)
|
|
return err;
|
|
|
|
switch (cmd->id) {
|
|
case POHMELFS_CRYPTO_CAPABILITIES:
|
|
return pohmelfs_crypto_cap_response(st);
|
|
case POHMELFS_ROOT_CAPABILITIES:
|
|
return pohmelfs_root_cap_response(st);
|
|
default:
|
|
break;
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Receiving extended attribute.
|
|
* Does not work properly if received size is more than requested one,
|
|
* it should not happen with current request/reply model though.
|
|
*/
|
|
static int pohmelfs_getxattr_response(struct netfs_state *st)
|
|
{
|
|
struct pohmelfs_sb *psb = st->psb;
|
|
struct netfs_cmd *cmd = &st->cmd;
|
|
struct pohmelfs_mcache *m;
|
|
short error = (signed short)cmd->ext, err;
|
|
unsigned int sz, total_size;
|
|
|
|
m = pohmelfs_mcache_search(psb, cmd->id);
|
|
|
|
dprintk("%s: id: %llu, gen: %llu, err: %d.\n",
|
|
__func__, cmd->id, (m) ? m->gen : 0, error);
|
|
|
|
if (!m) {
|
|
printk("%s: failed to find getxattr cache entry: id: %llu.\n", __func__, cmd->id);
|
|
return -ENOENT;
|
|
}
|
|
|
|
if (cmd->size) {
|
|
sz = min_t(unsigned int, cmd->size, m->size);
|
|
err = pohmelfs_data_recv_and_check(st, m->data, sz);
|
|
if (err) {
|
|
error = err;
|
|
goto out;
|
|
}
|
|
|
|
m->size = sz;
|
|
total_size = cmd->size - sz;
|
|
|
|
while (total_size) {
|
|
sz = min(total_size, st->size);
|
|
|
|
err = pohmelfs_data_recv_and_check(st, st->data, sz);
|
|
if (err) {
|
|
error = err;
|
|
break;
|
|
}
|
|
|
|
total_size -= sz;
|
|
}
|
|
}
|
|
|
|
out:
|
|
m->err = error;
|
|
complete(&m->complete);
|
|
pohmelfs_mcache_put(psb, m);
|
|
|
|
return error;
|
|
}
|
|
|
|
int pohmelfs_data_lock_response(struct netfs_state *st)
|
|
{
|
|
struct pohmelfs_sb *psb = st->psb;
|
|
struct netfs_cmd *cmd = &st->cmd;
|
|
struct pohmelfs_mcache *m;
|
|
short err = (signed short)cmd->ext;
|
|
u64 id = cmd->id;
|
|
|
|
m = pohmelfs_mcache_search(psb, id);
|
|
|
|
dprintk("%s: id: %llu, gen: %llu, err: %d.\n",
|
|
__func__, cmd->id, (m) ? m->gen : 0, err);
|
|
|
|
if (!m) {
|
|
pohmelfs_data_recv(st, st->data, cmd->size);
|
|
printk("%s: failed to find data lock response: id: %llu.\n", __func__, cmd->id);
|
|
return -ENOENT;
|
|
}
|
|
|
|
if (cmd->size)
|
|
err = pohmelfs_data_recv_and_check(st, &m->info, cmd->size);
|
|
|
|
m->err = err;
|
|
complete(&m->complete);
|
|
pohmelfs_mcache_put(psb, m);
|
|
|
|
return err;
|
|
}
|
|
|
|
static void __inline__ netfs_state_reset(struct netfs_state *st)
|
|
{
|
|
netfs_state_lock_send(st);
|
|
netfs_state_exit(st);
|
|
netfs_state_init(st);
|
|
netfs_state_unlock_send(st);
|
|
}
|
|
|
|
/*
|
|
* Main receiving function, called from dedicated kernel thread.
|
|
*/
|
|
static int pohmelfs_recv(void *data)
|
|
{
|
|
int err = -EINTR;
|
|
struct netfs_state *st = data;
|
|
struct netfs_cmd *cmd = &st->cmd;
|
|
|
|
while (!kthread_should_stop()) {
|
|
/*
|
|
* If socket will be reset after this statement, then
|
|
* pohmelfs_data_recv() will just fail and loop will
|
|
* start again, so it can be done without any locks.
|
|
*
|
|
* st->read_socket is needed to prevents state machine
|
|
* breaking between this data reading and subsequent one
|
|
* in protocol specific functions during connection reset.
|
|
* In case of reset we have to read next command and do
|
|
* not expect data for old command to magically appear in
|
|
* new connection.
|
|
*/
|
|
st->read_socket = st->socket;
|
|
err = pohmelfs_data_recv(st, cmd, sizeof(struct netfs_cmd));
|
|
if (err) {
|
|
msleep(1000);
|
|
continue;
|
|
}
|
|
|
|
netfs_convert_cmd(cmd);
|
|
|
|
dprintk("%s: cmd: %u, id: %llu, start: %llu, size: %u, "
|
|
"ext: %u, csize: %u, cpad: %u.\n",
|
|
__func__, cmd->cmd, cmd->id, cmd->start,
|
|
cmd->size, cmd->ext, cmd->csize, cmd->cpad);
|
|
|
|
if (cmd->csize) {
|
|
struct pohmelfs_crypto_engine *e = &st->eng;
|
|
|
|
if (unlikely(cmd->csize > e->size/2)) {
|
|
netfs_state_reset(st);
|
|
continue;
|
|
}
|
|
|
|
if (e->hash && unlikely(cmd->csize != st->psb->crypto_attached_size)) {
|
|
dprintk("%s: cmd: cmd: %u, id: %llu, start: %llu, size: %u, "
|
|
"csize: %u != digest size %u.\n",
|
|
__func__, cmd->cmd, cmd->id, cmd->start, cmd->size,
|
|
cmd->csize, st->psb->crypto_attached_size);
|
|
netfs_state_reset(st);
|
|
continue;
|
|
}
|
|
|
|
err = pohmelfs_data_recv(st, e->data, cmd->csize);
|
|
if (err) {
|
|
netfs_state_reset(st);
|
|
continue;
|
|
}
|
|
|
|
#ifdef CONFIG_POHMELFS_DEBUG
|
|
{
|
|
unsigned int i;
|
|
unsigned char *hash = e->data;
|
|
|
|
dprintk("%s: received hash: ", __func__);
|
|
for (i = 0; i < cmd->csize; ++i)
|
|
printk("%02x ", hash[i]);
|
|
|
|
printk("\n");
|
|
}
|
|
#endif
|
|
cmd->size -= cmd->csize;
|
|
}
|
|
|
|
/*
|
|
* This should catch protocol breakage and random garbage instead of commands.
|
|
*/
|
|
if (unlikely((cmd->size > st->size) && (cmd->cmd != NETFS_XATTR_GET))) {
|
|
netfs_state_reset(st);
|
|
continue;
|
|
}
|
|
|
|
switch (cmd->cmd) {
|
|
case NETFS_READ_PAGE:
|
|
err = pohmelfs_read_page_response(st);
|
|
break;
|
|
case NETFS_READDIR:
|
|
err = pohmelfs_readdir_response(st);
|
|
break;
|
|
case NETFS_LOOKUP:
|
|
err = pohmelfs_lookup_response(st);
|
|
break;
|
|
case NETFS_CREATE:
|
|
err = pohmelfs_create_response(st);
|
|
break;
|
|
case NETFS_REMOVE:
|
|
err = pohmelfs_remove_response(st);
|
|
break;
|
|
case NETFS_TRANS:
|
|
err = pohmelfs_transaction_response(st);
|
|
break;
|
|
case NETFS_PAGE_CACHE:
|
|
err = pohmelfs_page_cache_response(st);
|
|
break;
|
|
case NETFS_CAPABILITIES:
|
|
err = pohmelfs_capabilities_response(st);
|
|
break;
|
|
case NETFS_LOCK:
|
|
err = pohmelfs_data_lock_response(st);
|
|
break;
|
|
case NETFS_XATTR_GET:
|
|
err = pohmelfs_getxattr_response(st);
|
|
break;
|
|
default:
|
|
printk("%s: wrong cmd: %u, id: %llu, start: %llu, size: %u, ext: %u.\n",
|
|
__func__, cmd->cmd, cmd->id, cmd->start, cmd->size, cmd->ext);
|
|
netfs_state_reset(st);
|
|
break;
|
|
}
|
|
}
|
|
|
|
while (!kthread_should_stop())
|
|
schedule_timeout_uninterruptible(msecs_to_jiffies(10));
|
|
|
|
return err;
|
|
}
|
|
|
|
int netfs_state_init(struct netfs_state *st)
|
|
{
|
|
int err;
|
|
struct pohmelfs_ctl *ctl = &st->ctl;
|
|
|
|
err = sock_create(ctl->addr.sa_family, ctl->type, ctl->proto, &st->socket);
|
|
if (err) {
|
|
printk("%s: failed to create a socket: family: %d, type: %d, proto: %d, err: %d.\n",
|
|
__func__, ctl->addr.sa_family, ctl->type, ctl->proto, err);
|
|
goto err_out_exit;
|
|
}
|
|
|
|
st->socket->sk->sk_allocation = GFP_NOIO;
|
|
st->socket->sk->sk_sndtimeo = st->socket->sk->sk_rcvtimeo = msecs_to_jiffies(60000);
|
|
|
|
err = kernel_connect(st->socket, (struct sockaddr *)&ctl->addr, ctl->addrlen, 0);
|
|
if (err) {
|
|
printk("%s: failed to connect to server: idx: %u, err: %d.\n",
|
|
__func__, st->psb->idx, err);
|
|
goto err_out_release;
|
|
}
|
|
st->socket->sk->sk_sndtimeo = st->socket->sk->sk_rcvtimeo = msecs_to_jiffies(60000);
|
|
|
|
err = netfs_poll_init(st);
|
|
if (err)
|
|
goto err_out_release;
|
|
|
|
if (st->socket->ops->family == AF_INET) {
|
|
struct sockaddr_in *sin = (struct sockaddr_in *)&ctl->addr;
|
|
printk(KERN_INFO "%s: (re)connected to peer %pi4:%d.\n", __func__,
|
|
&sin->sin_addr.s_addr, ntohs(sin->sin_port));
|
|
} else if (st->socket->ops->family == AF_INET6) {
|
|
struct sockaddr_in6 *sin = (struct sockaddr_in6 *)&ctl->addr;
|
|
printk(KERN_INFO "%s: (re)connected to peer %pi6:%d", __func__,
|
|
&sin->sin6_addr, ntohs(sin->sin6_port));
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_out_release:
|
|
sock_release(st->socket);
|
|
err_out_exit:
|
|
st->socket = NULL;
|
|
return err;
|
|
}
|
|
|
|
void netfs_state_exit(struct netfs_state *st)
|
|
{
|
|
if (st->socket) {
|
|
netfs_poll_exit(st);
|
|
st->socket->ops->shutdown(st->socket, 2);
|
|
|
|
if (st->socket->ops->family == AF_INET) {
|
|
struct sockaddr_in *sin = (struct sockaddr_in *)&st->ctl.addr;
|
|
printk(KERN_INFO "%s: disconnected from peer %pi4:%d.\n", __func__,
|
|
&sin->sin_addr.s_addr, ntohs(sin->sin_port));
|
|
} else if (st->socket->ops->family == AF_INET6) {
|
|
struct sockaddr_in6 *sin = (struct sockaddr_in6 *)&st->ctl.addr;
|
|
printk(KERN_INFO "%s: disconnected from peer %pi6:%d", __func__,
|
|
&sin->sin6_addr, ntohs(sin->sin6_port));
|
|
}
|
|
|
|
sock_release(st->socket);
|
|
st->socket = NULL;
|
|
st->read_socket = NULL;
|
|
st->need_reset = 0;
|
|
}
|
|
}
|
|
|
|
int pohmelfs_state_init_one(struct pohmelfs_sb *psb, struct pohmelfs_config *conf)
|
|
{
|
|
struct netfs_state *st = &conf->state;
|
|
int err = -ENOMEM;
|
|
|
|
mutex_init(&st->__state_lock);
|
|
mutex_init(&st->__state_send_lock);
|
|
init_waitqueue_head(&st->thread_wait);
|
|
|
|
st->psb = psb;
|
|
st->trans_root = RB_ROOT;
|
|
mutex_init(&st->trans_lock);
|
|
|
|
st->size = psb->trans_data_size;
|
|
st->data = kmalloc(st->size, GFP_KERNEL);
|
|
if (!st->data)
|
|
goto err_out_exit;
|
|
|
|
if (psb->perform_crypto) {
|
|
err = pohmelfs_crypto_engine_init(&st->eng, psb);
|
|
if (err)
|
|
goto err_out_free_data;
|
|
}
|
|
|
|
err = netfs_state_init(st);
|
|
if (err)
|
|
goto err_out_free_engine;
|
|
|
|
st->thread = kthread_run(pohmelfs_recv, st, "pohmelfs/%u", psb->idx);
|
|
if (IS_ERR(st->thread)) {
|
|
err = PTR_ERR(st->thread);
|
|
goto err_out_netfs_exit;
|
|
}
|
|
|
|
if (!psb->active_state)
|
|
psb->active_state = conf;
|
|
|
|
dprintk("%s: conf: %p, st: %p, socket: %p.\n",
|
|
__func__, conf, st, st->socket);
|
|
return 0;
|
|
|
|
err_out_netfs_exit:
|
|
netfs_state_exit(st);
|
|
err_out_free_engine:
|
|
pohmelfs_crypto_engine_exit(&st->eng);
|
|
err_out_free_data:
|
|
kfree(st->data);
|
|
err_out_exit:
|
|
return err;
|
|
|
|
}
|
|
|
|
void pohmelfs_state_flush_transactions(struct netfs_state *st)
|
|
{
|
|
struct rb_node *rb_node;
|
|
struct netfs_trans_dst *dst;
|
|
|
|
mutex_lock(&st->trans_lock);
|
|
for (rb_node = rb_first(&st->trans_root); rb_node; ) {
|
|
dst = rb_entry(rb_node, struct netfs_trans_dst, state_entry);
|
|
rb_node = rb_next(rb_node);
|
|
|
|
dst->trans->result = -EINVAL;
|
|
netfs_trans_remove_nolock(dst, st);
|
|
netfs_trans_drop_dst_nostate(dst);
|
|
}
|
|
mutex_unlock(&st->trans_lock);
|
|
}
|
|
|
|
static void pohmelfs_state_exit_one(struct pohmelfs_config *c)
|
|
{
|
|
struct netfs_state *st = &c->state;
|
|
|
|
dprintk("%s: exiting, st: %p.\n", __func__, st);
|
|
if (st->thread) {
|
|
kthread_stop(st->thread);
|
|
st->thread = NULL;
|
|
}
|
|
|
|
netfs_state_lock_send(st);
|
|
netfs_state_exit(st);
|
|
netfs_state_unlock_send(st);
|
|
|
|
pohmelfs_state_flush_transactions(st);
|
|
|
|
pohmelfs_crypto_engine_exit(&st->eng);
|
|
kfree(st->data);
|
|
|
|
kfree(c);
|
|
}
|
|
|
|
/*
|
|
* Initialize network stack. It searches for given ID in global
|
|
* configuration table, this contains information of the remote server
|
|
* (address (any supported by socket interface) and port, protocol and so on).
|
|
*/
|
|
int pohmelfs_state_init(struct pohmelfs_sb *psb)
|
|
{
|
|
int err = -ENOMEM;
|
|
|
|
err = pohmelfs_copy_config(psb);
|
|
if (err) {
|
|
pohmelfs_state_exit(psb);
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void pohmelfs_state_exit(struct pohmelfs_sb *psb)
|
|
{
|
|
struct pohmelfs_config *c, *tmp;
|
|
|
|
list_for_each_entry_safe(c, tmp, &psb->state_list, config_entry) {
|
|
list_del(&c->config_entry);
|
|
pohmelfs_state_exit_one(c);
|
|
}
|
|
}
|
|
|
|
void pohmelfs_switch_active(struct pohmelfs_sb *psb)
|
|
{
|
|
struct pohmelfs_config *c = psb->active_state;
|
|
|
|
if (!list_empty(&psb->state_list)) {
|
|
if (c->config_entry.next != &psb->state_list) {
|
|
psb->active_state = list_entry(c->config_entry.next,
|
|
struct pohmelfs_config, config_entry);
|
|
} else {
|
|
psb->active_state = list_entry(psb->state_list.next,
|
|
struct pohmelfs_config, config_entry);
|
|
}
|
|
|
|
dprintk("%s: empty: %d, active %p -> %p.\n",
|
|
__func__, list_empty(&psb->state_list), c,
|
|
psb->active_state);
|
|
} else
|
|
psb->active_state = NULL;
|
|
}
|
|
|
|
void pohmelfs_check_states(struct pohmelfs_sb *psb)
|
|
{
|
|
struct pohmelfs_config *c, *tmp;
|
|
LIST_HEAD(delete_list);
|
|
|
|
mutex_lock(&psb->state_lock);
|
|
list_for_each_entry_safe(c, tmp, &psb->state_list, config_entry) {
|
|
if (pohmelfs_config_check(c, psb->idx)) {
|
|
|
|
if (psb->active_state == c)
|
|
pohmelfs_switch_active(psb);
|
|
list_move(&c->config_entry, &delete_list);
|
|
}
|
|
}
|
|
pohmelfs_copy_config(psb);
|
|
mutex_unlock(&psb->state_lock);
|
|
|
|
list_for_each_entry_safe(c, tmp, &delete_list, config_entry) {
|
|
list_del(&c->config_entry);
|
|
pohmelfs_state_exit_one(c);
|
|
}
|
|
}
|