4551 lines
123 KiB
C
4551 lines
123 KiB
C
/*
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drbd_receiver.c
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This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
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Copyright (C) 2001-2008, LINBIT Information Technologies GmbH.
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Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>.
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Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>.
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drbd 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, or (at your option)
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any later version.
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drbd 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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You should have received a copy of the GNU General Public License
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along with drbd; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <asm/uaccess.h>
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#include <net/sock.h>
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#include <linux/drbd.h>
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#include <linux/fs.h>
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#include <linux/file.h>
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#include <linux/in.h>
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#include <linux/mm.h>
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#include <linux/memcontrol.h>
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#include <linux/mm_inline.h>
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#include <linux/slab.h>
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#include <linux/smp_lock.h>
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#include <linux/pkt_sched.h>
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#define __KERNEL_SYSCALLS__
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#include <linux/unistd.h>
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#include <linux/vmalloc.h>
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#include <linux/random.h>
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#include <linux/string.h>
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#include <linux/scatterlist.h>
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#include "drbd_int.h"
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#include "drbd_req.h"
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#include "drbd_vli.h"
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struct flush_work {
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struct drbd_work w;
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struct drbd_epoch *epoch;
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};
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enum finish_epoch {
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FE_STILL_LIVE,
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FE_DESTROYED,
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FE_RECYCLED,
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};
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static int drbd_do_handshake(struct drbd_conf *mdev);
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static int drbd_do_auth(struct drbd_conf *mdev);
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static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *, struct drbd_epoch *, enum epoch_event);
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static int e_end_block(struct drbd_conf *, struct drbd_work *, int);
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static struct drbd_epoch *previous_epoch(struct drbd_conf *mdev, struct drbd_epoch *epoch)
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{
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struct drbd_epoch *prev;
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spin_lock(&mdev->epoch_lock);
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prev = list_entry(epoch->list.prev, struct drbd_epoch, list);
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if (prev == epoch || prev == mdev->current_epoch)
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prev = NULL;
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spin_unlock(&mdev->epoch_lock);
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return prev;
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}
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#define GFP_TRY (__GFP_HIGHMEM | __GFP_NOWARN)
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/*
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* some helper functions to deal with single linked page lists,
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* page->private being our "next" pointer.
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*/
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/* If at least n pages are linked at head, get n pages off.
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* Otherwise, don't modify head, and return NULL.
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* Locking is the responsibility of the caller.
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*/
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static struct page *page_chain_del(struct page **head, int n)
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{
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struct page *page;
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struct page *tmp;
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BUG_ON(!n);
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BUG_ON(!head);
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page = *head;
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if (!page)
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return NULL;
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while (page) {
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tmp = page_chain_next(page);
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if (--n == 0)
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break; /* found sufficient pages */
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if (tmp == NULL)
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/* insufficient pages, don't use any of them. */
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return NULL;
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page = tmp;
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}
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/* add end of list marker for the returned list */
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set_page_private(page, 0);
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/* actual return value, and adjustment of head */
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page = *head;
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*head = tmp;
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return page;
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}
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/* may be used outside of locks to find the tail of a (usually short)
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* "private" page chain, before adding it back to a global chain head
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* with page_chain_add() under a spinlock. */
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static struct page *page_chain_tail(struct page *page, int *len)
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{
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struct page *tmp;
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int i = 1;
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while ((tmp = page_chain_next(page)))
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++i, page = tmp;
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if (len)
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*len = i;
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return page;
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}
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static int page_chain_free(struct page *page)
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{
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struct page *tmp;
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int i = 0;
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page_chain_for_each_safe(page, tmp) {
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put_page(page);
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++i;
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}
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return i;
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}
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static void page_chain_add(struct page **head,
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struct page *chain_first, struct page *chain_last)
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{
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#if 1
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struct page *tmp;
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tmp = page_chain_tail(chain_first, NULL);
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BUG_ON(tmp != chain_last);
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#endif
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/* add chain to head */
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set_page_private(chain_last, (unsigned long)*head);
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*head = chain_first;
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}
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static struct page *drbd_pp_first_pages_or_try_alloc(struct drbd_conf *mdev, int number)
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{
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struct page *page = NULL;
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struct page *tmp = NULL;
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int i = 0;
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/* Yes, testing drbd_pp_vacant outside the lock is racy.
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* So what. It saves a spin_lock. */
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if (drbd_pp_vacant >= number) {
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spin_lock(&drbd_pp_lock);
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page = page_chain_del(&drbd_pp_pool, number);
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if (page)
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drbd_pp_vacant -= number;
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spin_unlock(&drbd_pp_lock);
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if (page)
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return page;
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}
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/* GFP_TRY, because we must not cause arbitrary write-out: in a DRBD
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* "criss-cross" setup, that might cause write-out on some other DRBD,
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* which in turn might block on the other node at this very place. */
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for (i = 0; i < number; i++) {
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tmp = alloc_page(GFP_TRY);
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if (!tmp)
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break;
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set_page_private(tmp, (unsigned long)page);
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page = tmp;
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}
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if (i == number)
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return page;
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/* Not enough pages immediately available this time.
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* No need to jump around here, drbd_pp_alloc will retry this
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* function "soon". */
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if (page) {
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tmp = page_chain_tail(page, NULL);
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spin_lock(&drbd_pp_lock);
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page_chain_add(&drbd_pp_pool, page, tmp);
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drbd_pp_vacant += i;
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spin_unlock(&drbd_pp_lock);
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}
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return NULL;
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}
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/* kick lower level device, if we have more than (arbitrary number)
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* reference counts on it, which typically are locally submitted io
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* requests. don't use unacked_cnt, so we speed up proto A and B, too. */
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static void maybe_kick_lo(struct drbd_conf *mdev)
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{
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if (atomic_read(&mdev->local_cnt) >= mdev->net_conf->unplug_watermark)
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drbd_kick_lo(mdev);
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}
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static void reclaim_net_ee(struct drbd_conf *mdev, struct list_head *to_be_freed)
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{
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struct drbd_epoch_entry *e;
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struct list_head *le, *tle;
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/* The EEs are always appended to the end of the list. Since
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they are sent in order over the wire, they have to finish
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in order. As soon as we see the first not finished we can
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stop to examine the list... */
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list_for_each_safe(le, tle, &mdev->net_ee) {
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e = list_entry(le, struct drbd_epoch_entry, w.list);
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if (drbd_ee_has_active_page(e))
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break;
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list_move(le, to_be_freed);
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}
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}
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static void drbd_kick_lo_and_reclaim_net(struct drbd_conf *mdev)
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{
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LIST_HEAD(reclaimed);
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struct drbd_epoch_entry *e, *t;
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maybe_kick_lo(mdev);
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spin_lock_irq(&mdev->req_lock);
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reclaim_net_ee(mdev, &reclaimed);
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spin_unlock_irq(&mdev->req_lock);
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list_for_each_entry_safe(e, t, &reclaimed, w.list)
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drbd_free_ee(mdev, e);
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}
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/**
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* drbd_pp_alloc() - Returns @number pages, retries forever (or until signalled)
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* @mdev: DRBD device.
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* @number: number of pages requested
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* @retry: whether to retry, if not enough pages are available right now
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*
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* Tries to allocate number pages, first from our own page pool, then from
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* the kernel, unless this allocation would exceed the max_buffers setting.
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* Possibly retry until DRBD frees sufficient pages somewhere else.
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*
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* Returns a page chain linked via page->private.
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*/
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static struct page *drbd_pp_alloc(struct drbd_conf *mdev, unsigned number, bool retry)
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{
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struct page *page = NULL;
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DEFINE_WAIT(wait);
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/* Yes, we may run up to @number over max_buffers. If we
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* follow it strictly, the admin will get it wrong anyways. */
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if (atomic_read(&mdev->pp_in_use) < mdev->net_conf->max_buffers)
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page = drbd_pp_first_pages_or_try_alloc(mdev, number);
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while (page == NULL) {
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prepare_to_wait(&drbd_pp_wait, &wait, TASK_INTERRUPTIBLE);
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drbd_kick_lo_and_reclaim_net(mdev);
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if (atomic_read(&mdev->pp_in_use) < mdev->net_conf->max_buffers) {
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page = drbd_pp_first_pages_or_try_alloc(mdev, number);
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if (page)
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break;
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}
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if (!retry)
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break;
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if (signal_pending(current)) {
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dev_warn(DEV, "drbd_pp_alloc interrupted!\n");
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break;
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}
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schedule();
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}
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finish_wait(&drbd_pp_wait, &wait);
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if (page)
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atomic_add(number, &mdev->pp_in_use);
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return page;
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}
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/* Must not be used from irq, as that may deadlock: see drbd_pp_alloc.
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* Is also used from inside an other spin_lock_irq(&mdev->req_lock);
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* Either links the page chain back to the global pool,
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* or returns all pages to the system. */
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static void drbd_pp_free(struct drbd_conf *mdev, struct page *page)
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{
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int i;
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if (drbd_pp_vacant > (DRBD_MAX_SEGMENT_SIZE/PAGE_SIZE)*minor_count)
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i = page_chain_free(page);
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else {
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struct page *tmp;
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tmp = page_chain_tail(page, &i);
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spin_lock(&drbd_pp_lock);
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page_chain_add(&drbd_pp_pool, page, tmp);
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drbd_pp_vacant += i;
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spin_unlock(&drbd_pp_lock);
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}
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atomic_sub(i, &mdev->pp_in_use);
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i = atomic_read(&mdev->pp_in_use);
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if (i < 0)
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dev_warn(DEV, "ASSERTION FAILED: pp_in_use: %d < 0\n", i);
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wake_up(&drbd_pp_wait);
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}
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/*
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You need to hold the req_lock:
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_drbd_wait_ee_list_empty()
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You must not have the req_lock:
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drbd_free_ee()
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drbd_alloc_ee()
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drbd_init_ee()
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drbd_release_ee()
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drbd_ee_fix_bhs()
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drbd_process_done_ee()
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drbd_clear_done_ee()
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drbd_wait_ee_list_empty()
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*/
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struct drbd_epoch_entry *drbd_alloc_ee(struct drbd_conf *mdev,
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u64 id,
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sector_t sector,
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unsigned int data_size,
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gfp_t gfp_mask) __must_hold(local)
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{
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struct drbd_epoch_entry *e;
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struct page *page;
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unsigned nr_pages = (data_size + PAGE_SIZE -1) >> PAGE_SHIFT;
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if (FAULT_ACTIVE(mdev, DRBD_FAULT_AL_EE))
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return NULL;
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e = mempool_alloc(drbd_ee_mempool, gfp_mask & ~__GFP_HIGHMEM);
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if (!e) {
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if (!(gfp_mask & __GFP_NOWARN))
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dev_err(DEV, "alloc_ee: Allocation of an EE failed\n");
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return NULL;
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}
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page = drbd_pp_alloc(mdev, nr_pages, (gfp_mask & __GFP_WAIT));
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if (!page)
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goto fail;
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INIT_HLIST_NODE(&e->colision);
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e->epoch = NULL;
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e->mdev = mdev;
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e->pages = page;
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atomic_set(&e->pending_bios, 0);
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e->size = data_size;
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e->flags = 0;
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e->sector = sector;
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e->sector = sector;
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e->block_id = id;
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return e;
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fail:
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mempool_free(e, drbd_ee_mempool);
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return NULL;
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}
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void drbd_free_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e)
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{
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drbd_pp_free(mdev, e->pages);
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D_ASSERT(atomic_read(&e->pending_bios) == 0);
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D_ASSERT(hlist_unhashed(&e->colision));
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mempool_free(e, drbd_ee_mempool);
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}
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int drbd_release_ee(struct drbd_conf *mdev, struct list_head *list)
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{
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LIST_HEAD(work_list);
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struct drbd_epoch_entry *e, *t;
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int count = 0;
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spin_lock_irq(&mdev->req_lock);
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list_splice_init(list, &work_list);
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spin_unlock_irq(&mdev->req_lock);
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list_for_each_entry_safe(e, t, &work_list, w.list) {
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drbd_free_ee(mdev, e);
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count++;
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}
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return count;
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}
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/*
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* This function is called from _asender only_
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* but see also comments in _req_mod(,barrier_acked)
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* and receive_Barrier.
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*
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* Move entries from net_ee to done_ee, if ready.
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* Grab done_ee, call all callbacks, free the entries.
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* The callbacks typically send out ACKs.
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*/
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static int drbd_process_done_ee(struct drbd_conf *mdev)
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{
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LIST_HEAD(work_list);
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LIST_HEAD(reclaimed);
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struct drbd_epoch_entry *e, *t;
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int ok = (mdev->state.conn >= C_WF_REPORT_PARAMS);
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spin_lock_irq(&mdev->req_lock);
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reclaim_net_ee(mdev, &reclaimed);
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list_splice_init(&mdev->done_ee, &work_list);
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spin_unlock_irq(&mdev->req_lock);
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list_for_each_entry_safe(e, t, &reclaimed, w.list)
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drbd_free_ee(mdev, e);
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|
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/* possible callbacks here:
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* e_end_block, and e_end_resync_block, e_send_discard_ack.
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* all ignore the last argument.
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*/
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list_for_each_entry_safe(e, t, &work_list, w.list) {
|
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/* list_del not necessary, next/prev members not touched */
|
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ok = e->w.cb(mdev, &e->w, !ok) && ok;
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drbd_free_ee(mdev, e);
|
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}
|
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wake_up(&mdev->ee_wait);
|
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|
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return ok;
|
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}
|
|
|
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void _drbd_wait_ee_list_empty(struct drbd_conf *mdev, struct list_head *head)
|
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{
|
|
DEFINE_WAIT(wait);
|
|
|
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/* avoids spin_lock/unlock
|
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* and calling prepare_to_wait in the fast path */
|
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while (!list_empty(head)) {
|
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prepare_to_wait(&mdev->ee_wait, &wait, TASK_UNINTERRUPTIBLE);
|
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spin_unlock_irq(&mdev->req_lock);
|
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drbd_kick_lo(mdev);
|
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schedule();
|
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finish_wait(&mdev->ee_wait, &wait);
|
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spin_lock_irq(&mdev->req_lock);
|
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}
|
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}
|
|
|
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void drbd_wait_ee_list_empty(struct drbd_conf *mdev, struct list_head *head)
|
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{
|
|
spin_lock_irq(&mdev->req_lock);
|
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_drbd_wait_ee_list_empty(mdev, head);
|
|
spin_unlock_irq(&mdev->req_lock);
|
|
}
|
|
|
|
/* see also kernel_accept; which is only present since 2.6.18.
|
|
* also we want to log which part of it failed, exactly */
|
|
static int drbd_accept(struct drbd_conf *mdev, const char **what,
|
|
struct socket *sock, struct socket **newsock)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
int err = 0;
|
|
|
|
*what = "listen";
|
|
err = sock->ops->listen(sock, 5);
|
|
if (err < 0)
|
|
goto out;
|
|
|
|
*what = "sock_create_lite";
|
|
err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol,
|
|
newsock);
|
|
if (err < 0)
|
|
goto out;
|
|
|
|
*what = "accept";
|
|
err = sock->ops->accept(sock, *newsock, 0);
|
|
if (err < 0) {
|
|
sock_release(*newsock);
|
|
*newsock = NULL;
|
|
goto out;
|
|
}
|
|
(*newsock)->ops = sock->ops;
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int drbd_recv_short(struct drbd_conf *mdev, struct socket *sock,
|
|
void *buf, size_t size, int flags)
|
|
{
|
|
mm_segment_t oldfs;
|
|
struct kvec iov = {
|
|
.iov_base = buf,
|
|
.iov_len = size,
|
|
};
|
|
struct msghdr msg = {
|
|
.msg_iovlen = 1,
|
|
.msg_iov = (struct iovec *)&iov,
|
|
.msg_flags = (flags ? flags : MSG_WAITALL | MSG_NOSIGNAL)
|
|
};
|
|
int rv;
|
|
|
|
oldfs = get_fs();
|
|
set_fs(KERNEL_DS);
|
|
rv = sock_recvmsg(sock, &msg, size, msg.msg_flags);
|
|
set_fs(oldfs);
|
|
|
|
return rv;
|
|
}
|
|
|
|
static int drbd_recv(struct drbd_conf *mdev, void *buf, size_t size)
|
|
{
|
|
mm_segment_t oldfs;
|
|
struct kvec iov = {
|
|
.iov_base = buf,
|
|
.iov_len = size,
|
|
};
|
|
struct msghdr msg = {
|
|
.msg_iovlen = 1,
|
|
.msg_iov = (struct iovec *)&iov,
|
|
.msg_flags = MSG_WAITALL | MSG_NOSIGNAL
|
|
};
|
|
int rv;
|
|
|
|
oldfs = get_fs();
|
|
set_fs(KERNEL_DS);
|
|
|
|
for (;;) {
|
|
rv = sock_recvmsg(mdev->data.socket, &msg, size, msg.msg_flags);
|
|
if (rv == size)
|
|
break;
|
|
|
|
/* Note:
|
|
* ECONNRESET other side closed the connection
|
|
* ERESTARTSYS (on sock) we got a signal
|
|
*/
|
|
|
|
if (rv < 0) {
|
|
if (rv == -ECONNRESET)
|
|
dev_info(DEV, "sock was reset by peer\n");
|
|
else if (rv != -ERESTARTSYS)
|
|
dev_err(DEV, "sock_recvmsg returned %d\n", rv);
|
|
break;
|
|
} else if (rv == 0) {
|
|
dev_info(DEV, "sock was shut down by peer\n");
|
|
break;
|
|
} else {
|
|
/* signal came in, or peer/link went down,
|
|
* after we read a partial message
|
|
*/
|
|
/* D_ASSERT(signal_pending(current)); */
|
|
break;
|
|
}
|
|
};
|
|
|
|
set_fs(oldfs);
|
|
|
|
if (rv != size)
|
|
drbd_force_state(mdev, NS(conn, C_BROKEN_PIPE));
|
|
|
|
return rv;
|
|
}
|
|
|
|
/* quoting tcp(7):
|
|
* On individual connections, the socket buffer size must be set prior to the
|
|
* listen(2) or connect(2) calls in order to have it take effect.
|
|
* This is our wrapper to do so.
|
|
*/
|
|
static void drbd_setbufsize(struct socket *sock, unsigned int snd,
|
|
unsigned int rcv)
|
|
{
|
|
/* open coded SO_SNDBUF, SO_RCVBUF */
|
|
if (snd) {
|
|
sock->sk->sk_sndbuf = snd;
|
|
sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
|
|
}
|
|
if (rcv) {
|
|
sock->sk->sk_rcvbuf = rcv;
|
|
sock->sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
|
|
}
|
|
}
|
|
|
|
static struct socket *drbd_try_connect(struct drbd_conf *mdev)
|
|
{
|
|
const char *what;
|
|
struct socket *sock;
|
|
struct sockaddr_in6 src_in6;
|
|
int err;
|
|
int disconnect_on_error = 1;
|
|
|
|
if (!get_net_conf(mdev))
|
|
return NULL;
|
|
|
|
what = "sock_create_kern";
|
|
err = sock_create_kern(((struct sockaddr *)mdev->net_conf->my_addr)->sa_family,
|
|
SOCK_STREAM, IPPROTO_TCP, &sock);
|
|
if (err < 0) {
|
|
sock = NULL;
|
|
goto out;
|
|
}
|
|
|
|
sock->sk->sk_rcvtimeo =
|
|
sock->sk->sk_sndtimeo = mdev->net_conf->try_connect_int*HZ;
|
|
drbd_setbufsize(sock, mdev->net_conf->sndbuf_size,
|
|
mdev->net_conf->rcvbuf_size);
|
|
|
|
/* explicitly bind to the configured IP as source IP
|
|
* for the outgoing connections.
|
|
* This is needed for multihomed hosts and to be
|
|
* able to use lo: interfaces for drbd.
|
|
* Make sure to use 0 as port number, so linux selects
|
|
* a free one dynamically.
|
|
*/
|
|
memcpy(&src_in6, mdev->net_conf->my_addr,
|
|
min_t(int, mdev->net_conf->my_addr_len, sizeof(src_in6)));
|
|
if (((struct sockaddr *)mdev->net_conf->my_addr)->sa_family == AF_INET6)
|
|
src_in6.sin6_port = 0;
|
|
else
|
|
((struct sockaddr_in *)&src_in6)->sin_port = 0; /* AF_INET & AF_SCI */
|
|
|
|
what = "bind before connect";
|
|
err = sock->ops->bind(sock,
|
|
(struct sockaddr *) &src_in6,
|
|
mdev->net_conf->my_addr_len);
|
|
if (err < 0)
|
|
goto out;
|
|
|
|
/* connect may fail, peer not yet available.
|
|
* stay C_WF_CONNECTION, don't go Disconnecting! */
|
|
disconnect_on_error = 0;
|
|
what = "connect";
|
|
err = sock->ops->connect(sock,
|
|
(struct sockaddr *)mdev->net_conf->peer_addr,
|
|
mdev->net_conf->peer_addr_len, 0);
|
|
|
|
out:
|
|
if (err < 0) {
|
|
if (sock) {
|
|
sock_release(sock);
|
|
sock = NULL;
|
|
}
|
|
switch (-err) {
|
|
/* timeout, busy, signal pending */
|
|
case ETIMEDOUT: case EAGAIN: case EINPROGRESS:
|
|
case EINTR: case ERESTARTSYS:
|
|
/* peer not (yet) available, network problem */
|
|
case ECONNREFUSED: case ENETUNREACH:
|
|
case EHOSTDOWN: case EHOSTUNREACH:
|
|
disconnect_on_error = 0;
|
|
break;
|
|
default:
|
|
dev_err(DEV, "%s failed, err = %d\n", what, err);
|
|
}
|
|
if (disconnect_on_error)
|
|
drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
|
|
}
|
|
put_net_conf(mdev);
|
|
return sock;
|
|
}
|
|
|
|
static struct socket *drbd_wait_for_connect(struct drbd_conf *mdev)
|
|
{
|
|
int timeo, err;
|
|
struct socket *s_estab = NULL, *s_listen;
|
|
const char *what;
|
|
|
|
if (!get_net_conf(mdev))
|
|
return NULL;
|
|
|
|
what = "sock_create_kern";
|
|
err = sock_create_kern(((struct sockaddr *)mdev->net_conf->my_addr)->sa_family,
|
|
SOCK_STREAM, IPPROTO_TCP, &s_listen);
|
|
if (err) {
|
|
s_listen = NULL;
|
|
goto out;
|
|
}
|
|
|
|
timeo = mdev->net_conf->try_connect_int * HZ;
|
|
timeo += (random32() & 1) ? timeo / 7 : -timeo / 7; /* 28.5% random jitter */
|
|
|
|
s_listen->sk->sk_reuse = 1; /* SO_REUSEADDR */
|
|
s_listen->sk->sk_rcvtimeo = timeo;
|
|
s_listen->sk->sk_sndtimeo = timeo;
|
|
drbd_setbufsize(s_listen, mdev->net_conf->sndbuf_size,
|
|
mdev->net_conf->rcvbuf_size);
|
|
|
|
what = "bind before listen";
|
|
err = s_listen->ops->bind(s_listen,
|
|
(struct sockaddr *) mdev->net_conf->my_addr,
|
|
mdev->net_conf->my_addr_len);
|
|
if (err < 0)
|
|
goto out;
|
|
|
|
err = drbd_accept(mdev, &what, s_listen, &s_estab);
|
|
|
|
out:
|
|
if (s_listen)
|
|
sock_release(s_listen);
|
|
if (err < 0) {
|
|
if (err != -EAGAIN && err != -EINTR && err != -ERESTARTSYS) {
|
|
dev_err(DEV, "%s failed, err = %d\n", what, err);
|
|
drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
|
|
}
|
|
}
|
|
put_net_conf(mdev);
|
|
|
|
return s_estab;
|
|
}
|
|
|
|
static int drbd_send_fp(struct drbd_conf *mdev,
|
|
struct socket *sock, enum drbd_packets cmd)
|
|
{
|
|
struct p_header *h = (struct p_header *) &mdev->data.sbuf.header;
|
|
|
|
return _drbd_send_cmd(mdev, sock, cmd, h, sizeof(*h), 0);
|
|
}
|
|
|
|
static enum drbd_packets drbd_recv_fp(struct drbd_conf *mdev, struct socket *sock)
|
|
{
|
|
struct p_header *h = (struct p_header *) &mdev->data.sbuf.header;
|
|
int rr;
|
|
|
|
rr = drbd_recv_short(mdev, sock, h, sizeof(*h), 0);
|
|
|
|
if (rr == sizeof(*h) && h->magic == BE_DRBD_MAGIC)
|
|
return be16_to_cpu(h->command);
|
|
|
|
return 0xffff;
|
|
}
|
|
|
|
/**
|
|
* drbd_socket_okay() - Free the socket if its connection is not okay
|
|
* @mdev: DRBD device.
|
|
* @sock: pointer to the pointer to the socket.
|
|
*/
|
|
static int drbd_socket_okay(struct drbd_conf *mdev, struct socket **sock)
|
|
{
|
|
int rr;
|
|
char tb[4];
|
|
|
|
if (!*sock)
|
|
return FALSE;
|
|
|
|
rr = drbd_recv_short(mdev, *sock, tb, 4, MSG_DONTWAIT | MSG_PEEK);
|
|
|
|
if (rr > 0 || rr == -EAGAIN) {
|
|
return TRUE;
|
|
} else {
|
|
sock_release(*sock);
|
|
*sock = NULL;
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* return values:
|
|
* 1 yes, we have a valid connection
|
|
* 0 oops, did not work out, please try again
|
|
* -1 peer talks different language,
|
|
* no point in trying again, please go standalone.
|
|
* -2 We do not have a network config...
|
|
*/
|
|
static int drbd_connect(struct drbd_conf *mdev)
|
|
{
|
|
struct socket *s, *sock, *msock;
|
|
int try, h, ok;
|
|
|
|
D_ASSERT(!mdev->data.socket);
|
|
|
|
if (drbd_request_state(mdev, NS(conn, C_WF_CONNECTION)) < SS_SUCCESS)
|
|
return -2;
|
|
|
|
clear_bit(DISCARD_CONCURRENT, &mdev->flags);
|
|
|
|
sock = NULL;
|
|
msock = NULL;
|
|
|
|
do {
|
|
for (try = 0;;) {
|
|
/* 3 tries, this should take less than a second! */
|
|
s = drbd_try_connect(mdev);
|
|
if (s || ++try >= 3)
|
|
break;
|
|
/* give the other side time to call bind() & listen() */
|
|
__set_current_state(TASK_INTERRUPTIBLE);
|
|
schedule_timeout(HZ / 10);
|
|
}
|
|
|
|
if (s) {
|
|
if (!sock) {
|
|
drbd_send_fp(mdev, s, P_HAND_SHAKE_S);
|
|
sock = s;
|
|
s = NULL;
|
|
} else if (!msock) {
|
|
drbd_send_fp(mdev, s, P_HAND_SHAKE_M);
|
|
msock = s;
|
|
s = NULL;
|
|
} else {
|
|
dev_err(DEV, "Logic error in drbd_connect()\n");
|
|
goto out_release_sockets;
|
|
}
|
|
}
|
|
|
|
if (sock && msock) {
|
|
__set_current_state(TASK_INTERRUPTIBLE);
|
|
schedule_timeout(HZ / 10);
|
|
ok = drbd_socket_okay(mdev, &sock);
|
|
ok = drbd_socket_okay(mdev, &msock) && ok;
|
|
if (ok)
|
|
break;
|
|
}
|
|
|
|
retry:
|
|
s = drbd_wait_for_connect(mdev);
|
|
if (s) {
|
|
try = drbd_recv_fp(mdev, s);
|
|
drbd_socket_okay(mdev, &sock);
|
|
drbd_socket_okay(mdev, &msock);
|
|
switch (try) {
|
|
case P_HAND_SHAKE_S:
|
|
if (sock) {
|
|
dev_warn(DEV, "initial packet S crossed\n");
|
|
sock_release(sock);
|
|
}
|
|
sock = s;
|
|
break;
|
|
case P_HAND_SHAKE_M:
|
|
if (msock) {
|
|
dev_warn(DEV, "initial packet M crossed\n");
|
|
sock_release(msock);
|
|
}
|
|
msock = s;
|
|
set_bit(DISCARD_CONCURRENT, &mdev->flags);
|
|
break;
|
|
default:
|
|
dev_warn(DEV, "Error receiving initial packet\n");
|
|
sock_release(s);
|
|
if (random32() & 1)
|
|
goto retry;
|
|
}
|
|
}
|
|
|
|
if (mdev->state.conn <= C_DISCONNECTING)
|
|
goto out_release_sockets;
|
|
if (signal_pending(current)) {
|
|
flush_signals(current);
|
|
smp_rmb();
|
|
if (get_t_state(&mdev->receiver) == Exiting)
|
|
goto out_release_sockets;
|
|
}
|
|
|
|
if (sock && msock) {
|
|
ok = drbd_socket_okay(mdev, &sock);
|
|
ok = drbd_socket_okay(mdev, &msock) && ok;
|
|
if (ok)
|
|
break;
|
|
}
|
|
} while (1);
|
|
|
|
msock->sk->sk_reuse = 1; /* SO_REUSEADDR */
|
|
sock->sk->sk_reuse = 1; /* SO_REUSEADDR */
|
|
|
|
sock->sk->sk_allocation = GFP_NOIO;
|
|
msock->sk->sk_allocation = GFP_NOIO;
|
|
|
|
sock->sk->sk_priority = TC_PRIO_INTERACTIVE_BULK;
|
|
msock->sk->sk_priority = TC_PRIO_INTERACTIVE;
|
|
|
|
/* NOT YET ...
|
|
* sock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10;
|
|
* sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
|
|
* first set it to the P_HAND_SHAKE timeout,
|
|
* which we set to 4x the configured ping_timeout. */
|
|
sock->sk->sk_sndtimeo =
|
|
sock->sk->sk_rcvtimeo = mdev->net_conf->ping_timeo*4*HZ/10;
|
|
|
|
msock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10;
|
|
msock->sk->sk_rcvtimeo = mdev->net_conf->ping_int*HZ;
|
|
|
|
/* we don't want delays.
|
|
* we use TCP_CORK where apropriate, though */
|
|
drbd_tcp_nodelay(sock);
|
|
drbd_tcp_nodelay(msock);
|
|
|
|
mdev->data.socket = sock;
|
|
mdev->meta.socket = msock;
|
|
mdev->last_received = jiffies;
|
|
|
|
D_ASSERT(mdev->asender.task == NULL);
|
|
|
|
h = drbd_do_handshake(mdev);
|
|
if (h <= 0)
|
|
return h;
|
|
|
|
if (mdev->cram_hmac_tfm) {
|
|
/* drbd_request_state(mdev, NS(conn, WFAuth)); */
|
|
switch (drbd_do_auth(mdev)) {
|
|
case -1:
|
|
dev_err(DEV, "Authentication of peer failed\n");
|
|
return -1;
|
|
case 0:
|
|
dev_err(DEV, "Authentication of peer failed, trying again.\n");
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
if (drbd_request_state(mdev, NS(conn, C_WF_REPORT_PARAMS)) < SS_SUCCESS)
|
|
return 0;
|
|
|
|
sock->sk->sk_sndtimeo = mdev->net_conf->timeout*HZ/10;
|
|
sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
|
|
|
|
atomic_set(&mdev->packet_seq, 0);
|
|
mdev->peer_seq = 0;
|
|
|
|
drbd_thread_start(&mdev->asender);
|
|
|
|
if (!drbd_send_protocol(mdev))
|
|
return -1;
|
|
drbd_send_sync_param(mdev, &mdev->sync_conf);
|
|
drbd_send_sizes(mdev, 0, 0);
|
|
drbd_send_uuids(mdev);
|
|
drbd_send_state(mdev);
|
|
clear_bit(USE_DEGR_WFC_T, &mdev->flags);
|
|
clear_bit(RESIZE_PENDING, &mdev->flags);
|
|
|
|
return 1;
|
|
|
|
out_release_sockets:
|
|
if (sock)
|
|
sock_release(sock);
|
|
if (msock)
|
|
sock_release(msock);
|
|
return -1;
|
|
}
|
|
|
|
static int drbd_recv_header(struct drbd_conf *mdev, struct p_header *h)
|
|
{
|
|
int r;
|
|
|
|
r = drbd_recv(mdev, h, sizeof(*h));
|
|
|
|
if (unlikely(r != sizeof(*h))) {
|
|
dev_err(DEV, "short read expecting header on sock: r=%d\n", r);
|
|
return FALSE;
|
|
};
|
|
h->command = be16_to_cpu(h->command);
|
|
h->length = be16_to_cpu(h->length);
|
|
if (unlikely(h->magic != BE_DRBD_MAGIC)) {
|
|
dev_err(DEV, "magic?? on data m: 0x%lx c: %d l: %d\n",
|
|
(long)be32_to_cpu(h->magic),
|
|
h->command, h->length);
|
|
return FALSE;
|
|
}
|
|
mdev->last_received = jiffies;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static enum finish_epoch drbd_flush_after_epoch(struct drbd_conf *mdev, struct drbd_epoch *epoch)
|
|
{
|
|
int rv;
|
|
|
|
if (mdev->write_ordering >= WO_bdev_flush && get_ldev(mdev)) {
|
|
rv = blkdev_issue_flush(mdev->ldev->backing_bdev, GFP_KERNEL,
|
|
NULL, BLKDEV_IFL_WAIT);
|
|
if (rv) {
|
|
dev_err(DEV, "local disk flush failed with status %d\n", rv);
|
|
/* would rather check on EOPNOTSUPP, but that is not reliable.
|
|
* don't try again for ANY return value != 0
|
|
* if (rv == -EOPNOTSUPP) */
|
|
drbd_bump_write_ordering(mdev, WO_drain_io);
|
|
}
|
|
put_ldev(mdev);
|
|
}
|
|
|
|
return drbd_may_finish_epoch(mdev, epoch, EV_BARRIER_DONE);
|
|
}
|
|
|
|
static int w_flush(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
|
|
{
|
|
struct flush_work *fw = (struct flush_work *)w;
|
|
struct drbd_epoch *epoch = fw->epoch;
|
|
|
|
kfree(w);
|
|
|
|
if (!test_and_set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags))
|
|
drbd_flush_after_epoch(mdev, epoch);
|
|
|
|
drbd_may_finish_epoch(mdev, epoch, EV_PUT |
|
|
(mdev->state.conn < C_CONNECTED ? EV_CLEANUP : 0));
|
|
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* drbd_may_finish_epoch() - Applies an epoch_event to the epoch's state, eventually finishes it.
|
|
* @mdev: DRBD device.
|
|
* @epoch: Epoch object.
|
|
* @ev: Epoch event.
|
|
*/
|
|
static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *mdev,
|
|
struct drbd_epoch *epoch,
|
|
enum epoch_event ev)
|
|
{
|
|
int finish, epoch_size;
|
|
struct drbd_epoch *next_epoch;
|
|
int schedule_flush = 0;
|
|
enum finish_epoch rv = FE_STILL_LIVE;
|
|
|
|
spin_lock(&mdev->epoch_lock);
|
|
do {
|
|
next_epoch = NULL;
|
|
finish = 0;
|
|
|
|
epoch_size = atomic_read(&epoch->epoch_size);
|
|
|
|
switch (ev & ~EV_CLEANUP) {
|
|
case EV_PUT:
|
|
atomic_dec(&epoch->active);
|
|
break;
|
|
case EV_GOT_BARRIER_NR:
|
|
set_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags);
|
|
|
|
/* Special case: If we just switched from WO_bio_barrier to
|
|
WO_bdev_flush we should not finish the current epoch */
|
|
if (test_bit(DE_CONTAINS_A_BARRIER, &epoch->flags) && epoch_size == 1 &&
|
|
mdev->write_ordering != WO_bio_barrier &&
|
|
epoch == mdev->current_epoch)
|
|
clear_bit(DE_CONTAINS_A_BARRIER, &epoch->flags);
|
|
break;
|
|
case EV_BARRIER_DONE:
|
|
set_bit(DE_BARRIER_IN_NEXT_EPOCH_DONE, &epoch->flags);
|
|
break;
|
|
case EV_BECAME_LAST:
|
|
/* nothing to do*/
|
|
break;
|
|
}
|
|
|
|
if (epoch_size != 0 &&
|
|
atomic_read(&epoch->active) == 0 &&
|
|
test_bit(DE_HAVE_BARRIER_NUMBER, &epoch->flags) &&
|
|
epoch->list.prev == &mdev->current_epoch->list &&
|
|
!test_bit(DE_IS_FINISHING, &epoch->flags)) {
|
|
/* Nearly all conditions are met to finish that epoch... */
|
|
if (test_bit(DE_BARRIER_IN_NEXT_EPOCH_DONE, &epoch->flags) ||
|
|
mdev->write_ordering == WO_none ||
|
|
(epoch_size == 1 && test_bit(DE_CONTAINS_A_BARRIER, &epoch->flags)) ||
|
|
ev & EV_CLEANUP) {
|
|
finish = 1;
|
|
set_bit(DE_IS_FINISHING, &epoch->flags);
|
|
} else if (!test_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags) &&
|
|
mdev->write_ordering == WO_bio_barrier) {
|
|
atomic_inc(&epoch->active);
|
|
schedule_flush = 1;
|
|
}
|
|
}
|
|
if (finish) {
|
|
if (!(ev & EV_CLEANUP)) {
|
|
spin_unlock(&mdev->epoch_lock);
|
|
drbd_send_b_ack(mdev, epoch->barrier_nr, epoch_size);
|
|
spin_lock(&mdev->epoch_lock);
|
|
}
|
|
dec_unacked(mdev);
|
|
|
|
if (mdev->current_epoch != epoch) {
|
|
next_epoch = list_entry(epoch->list.next, struct drbd_epoch, list);
|
|
list_del(&epoch->list);
|
|
ev = EV_BECAME_LAST | (ev & EV_CLEANUP);
|
|
mdev->epochs--;
|
|
kfree(epoch);
|
|
|
|
if (rv == FE_STILL_LIVE)
|
|
rv = FE_DESTROYED;
|
|
} else {
|
|
epoch->flags = 0;
|
|
atomic_set(&epoch->epoch_size, 0);
|
|
/* atomic_set(&epoch->active, 0); is already zero */
|
|
if (rv == FE_STILL_LIVE)
|
|
rv = FE_RECYCLED;
|
|
}
|
|
}
|
|
|
|
if (!next_epoch)
|
|
break;
|
|
|
|
epoch = next_epoch;
|
|
} while (1);
|
|
|
|
spin_unlock(&mdev->epoch_lock);
|
|
|
|
if (schedule_flush) {
|
|
struct flush_work *fw;
|
|
fw = kmalloc(sizeof(*fw), GFP_ATOMIC);
|
|
if (fw) {
|
|
fw->w.cb = w_flush;
|
|
fw->epoch = epoch;
|
|
drbd_queue_work(&mdev->data.work, &fw->w);
|
|
} else {
|
|
dev_warn(DEV, "Could not kmalloc a flush_work obj\n");
|
|
set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags);
|
|
/* That is not a recursion, only one level */
|
|
drbd_may_finish_epoch(mdev, epoch, EV_BARRIER_DONE);
|
|
drbd_may_finish_epoch(mdev, epoch, EV_PUT);
|
|
}
|
|
}
|
|
|
|
return rv;
|
|
}
|
|
|
|
/**
|
|
* drbd_bump_write_ordering() - Fall back to an other write ordering method
|
|
* @mdev: DRBD device.
|
|
* @wo: Write ordering method to try.
|
|
*/
|
|
void drbd_bump_write_ordering(struct drbd_conf *mdev, enum write_ordering_e wo) __must_hold(local)
|
|
{
|
|
enum write_ordering_e pwo;
|
|
static char *write_ordering_str[] = {
|
|
[WO_none] = "none",
|
|
[WO_drain_io] = "drain",
|
|
[WO_bdev_flush] = "flush",
|
|
[WO_bio_barrier] = "barrier",
|
|
};
|
|
|
|
pwo = mdev->write_ordering;
|
|
wo = min(pwo, wo);
|
|
if (wo == WO_bio_barrier && mdev->ldev->dc.no_disk_barrier)
|
|
wo = WO_bdev_flush;
|
|
if (wo == WO_bdev_flush && mdev->ldev->dc.no_disk_flush)
|
|
wo = WO_drain_io;
|
|
if (wo == WO_drain_io && mdev->ldev->dc.no_disk_drain)
|
|
wo = WO_none;
|
|
mdev->write_ordering = wo;
|
|
if (pwo != mdev->write_ordering || wo == WO_bio_barrier)
|
|
dev_info(DEV, "Method to ensure write ordering: %s\n", write_ordering_str[mdev->write_ordering]);
|
|
}
|
|
|
|
/**
|
|
* drbd_submit_ee()
|
|
* @mdev: DRBD device.
|
|
* @e: epoch entry
|
|
* @rw: flag field, see bio->bi_rw
|
|
*/
|
|
/* TODO allocate from our own bio_set. */
|
|
int drbd_submit_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e,
|
|
const unsigned rw, const int fault_type)
|
|
{
|
|
struct bio *bios = NULL;
|
|
struct bio *bio;
|
|
struct page *page = e->pages;
|
|
sector_t sector = e->sector;
|
|
unsigned ds = e->size;
|
|
unsigned n_bios = 0;
|
|
unsigned nr_pages = (ds + PAGE_SIZE -1) >> PAGE_SHIFT;
|
|
|
|
/* In most cases, we will only need one bio. But in case the lower
|
|
* level restrictions happen to be different at this offset on this
|
|
* side than those of the sending peer, we may need to submit the
|
|
* request in more than one bio. */
|
|
next_bio:
|
|
bio = bio_alloc(GFP_NOIO, nr_pages);
|
|
if (!bio) {
|
|
dev_err(DEV, "submit_ee: Allocation of a bio failed\n");
|
|
goto fail;
|
|
}
|
|
/* > e->sector, unless this is the first bio */
|
|
bio->bi_sector = sector;
|
|
bio->bi_bdev = mdev->ldev->backing_bdev;
|
|
/* we special case some flags in the multi-bio case, see below
|
|
* (REQ_UNPLUG, REQ_HARDBARRIER) */
|
|
bio->bi_rw = rw;
|
|
bio->bi_private = e;
|
|
bio->bi_end_io = drbd_endio_sec;
|
|
|
|
bio->bi_next = bios;
|
|
bios = bio;
|
|
++n_bios;
|
|
|
|
page_chain_for_each(page) {
|
|
unsigned len = min_t(unsigned, ds, PAGE_SIZE);
|
|
if (!bio_add_page(bio, page, len, 0)) {
|
|
/* a single page must always be possible! */
|
|
BUG_ON(bio->bi_vcnt == 0);
|
|
goto next_bio;
|
|
}
|
|
ds -= len;
|
|
sector += len >> 9;
|
|
--nr_pages;
|
|
}
|
|
D_ASSERT(page == NULL);
|
|
D_ASSERT(ds == 0);
|
|
|
|
atomic_set(&e->pending_bios, n_bios);
|
|
do {
|
|
bio = bios;
|
|
bios = bios->bi_next;
|
|
bio->bi_next = NULL;
|
|
|
|
/* strip off REQ_UNPLUG unless it is the last bio */
|
|
if (bios)
|
|
bio->bi_rw &= ~REQ_UNPLUG;
|
|
|
|
drbd_generic_make_request(mdev, fault_type, bio);
|
|
|
|
/* strip off REQ_HARDBARRIER,
|
|
* unless it is the first or last bio */
|
|
if (bios && bios->bi_next)
|
|
bios->bi_rw &= ~REQ_HARDBARRIER;
|
|
} while (bios);
|
|
maybe_kick_lo(mdev);
|
|
return 0;
|
|
|
|
fail:
|
|
while (bios) {
|
|
bio = bios;
|
|
bios = bios->bi_next;
|
|
bio_put(bio);
|
|
}
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/**
|
|
* w_e_reissue() - Worker callback; Resubmit a bio, without REQ_HARDBARRIER set
|
|
* @mdev: DRBD device.
|
|
* @w: work object.
|
|
* @cancel: The connection will be closed anyways (unused in this callback)
|
|
*/
|
|
int w_e_reissue(struct drbd_conf *mdev, struct drbd_work *w, int cancel) __releases(local)
|
|
{
|
|
struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w;
|
|
/* We leave DE_CONTAINS_A_BARRIER and EE_IS_BARRIER in place,
|
|
(and DE_BARRIER_IN_NEXT_EPOCH_ISSUED in the previous Epoch)
|
|
so that we can finish that epoch in drbd_may_finish_epoch().
|
|
That is necessary if we already have a long chain of Epochs, before
|
|
we realize that REQ_HARDBARRIER is actually not supported */
|
|
|
|
/* As long as the -ENOTSUPP on the barrier is reported immediately
|
|
that will never trigger. If it is reported late, we will just
|
|
print that warning and continue correctly for all future requests
|
|
with WO_bdev_flush */
|
|
if (previous_epoch(mdev, e->epoch))
|
|
dev_warn(DEV, "Write ordering was not enforced (one time event)\n");
|
|
|
|
/* we still have a local reference,
|
|
* get_ldev was done in receive_Data. */
|
|
|
|
e->w.cb = e_end_block;
|
|
if (drbd_submit_ee(mdev, e, WRITE, DRBD_FAULT_DT_WR) != 0) {
|
|
/* drbd_submit_ee fails for one reason only:
|
|
* if was not able to allocate sufficient bios.
|
|
* requeue, try again later. */
|
|
e->w.cb = w_e_reissue;
|
|
drbd_queue_work(&mdev->data.work, &e->w);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int receive_Barrier(struct drbd_conf *mdev, struct p_header *h)
|
|
{
|
|
int rv, issue_flush;
|
|
struct p_barrier *p = (struct p_barrier *)h;
|
|
struct drbd_epoch *epoch;
|
|
|
|
ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) return FALSE;
|
|
|
|
rv = drbd_recv(mdev, h->payload, h->length);
|
|
ERR_IF(rv != h->length) return FALSE;
|
|
|
|
inc_unacked(mdev);
|
|
|
|
if (mdev->net_conf->wire_protocol != DRBD_PROT_C)
|
|
drbd_kick_lo(mdev);
|
|
|
|
mdev->current_epoch->barrier_nr = p->barrier;
|
|
rv = drbd_may_finish_epoch(mdev, mdev->current_epoch, EV_GOT_BARRIER_NR);
|
|
|
|
/* P_BARRIER_ACK may imply that the corresponding extent is dropped from
|
|
* the activity log, which means it would not be resynced in case the
|
|
* R_PRIMARY crashes now.
|
|
* Therefore we must send the barrier_ack after the barrier request was
|
|
* completed. */
|
|
switch (mdev->write_ordering) {
|
|
case WO_bio_barrier:
|
|
case WO_none:
|
|
if (rv == FE_RECYCLED)
|
|
return TRUE;
|
|
break;
|
|
|
|
case WO_bdev_flush:
|
|
case WO_drain_io:
|
|
if (rv == FE_STILL_LIVE) {
|
|
set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &mdev->current_epoch->flags);
|
|
drbd_wait_ee_list_empty(mdev, &mdev->active_ee);
|
|
rv = drbd_flush_after_epoch(mdev, mdev->current_epoch);
|
|
}
|
|
if (rv == FE_RECYCLED)
|
|
return TRUE;
|
|
|
|
/* The asender will send all the ACKs and barrier ACKs out, since
|
|
all EEs moved from the active_ee to the done_ee. We need to
|
|
provide a new epoch object for the EEs that come in soon */
|
|
break;
|
|
}
|
|
|
|
/* receiver context, in the writeout path of the other node.
|
|
* avoid potential distributed deadlock */
|
|
epoch = kmalloc(sizeof(struct drbd_epoch), GFP_NOIO);
|
|
if (!epoch) {
|
|
dev_warn(DEV, "Allocation of an epoch failed, slowing down\n");
|
|
issue_flush = !test_and_set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &mdev->current_epoch->flags);
|
|
drbd_wait_ee_list_empty(mdev, &mdev->active_ee);
|
|
if (issue_flush) {
|
|
rv = drbd_flush_after_epoch(mdev, mdev->current_epoch);
|
|
if (rv == FE_RECYCLED)
|
|
return TRUE;
|
|
}
|
|
|
|
drbd_wait_ee_list_empty(mdev, &mdev->done_ee);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
epoch->flags = 0;
|
|
atomic_set(&epoch->epoch_size, 0);
|
|
atomic_set(&epoch->active, 0);
|
|
|
|
spin_lock(&mdev->epoch_lock);
|
|
if (atomic_read(&mdev->current_epoch->epoch_size)) {
|
|
list_add(&epoch->list, &mdev->current_epoch->list);
|
|
mdev->current_epoch = epoch;
|
|
mdev->epochs++;
|
|
} else {
|
|
/* The current_epoch got recycled while we allocated this one... */
|
|
kfree(epoch);
|
|
}
|
|
spin_unlock(&mdev->epoch_lock);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/* used from receive_RSDataReply (recv_resync_read)
|
|
* and from receive_Data */
|
|
static struct drbd_epoch_entry *
|
|
read_in_block(struct drbd_conf *mdev, u64 id, sector_t sector, int data_size) __must_hold(local)
|
|
{
|
|
const sector_t capacity = drbd_get_capacity(mdev->this_bdev);
|
|
struct drbd_epoch_entry *e;
|
|
struct page *page;
|
|
int dgs, ds, rr;
|
|
void *dig_in = mdev->int_dig_in;
|
|
void *dig_vv = mdev->int_dig_vv;
|
|
unsigned long *data;
|
|
|
|
dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_r_tfm) ?
|
|
crypto_hash_digestsize(mdev->integrity_r_tfm) : 0;
|
|
|
|
if (dgs) {
|
|
rr = drbd_recv(mdev, dig_in, dgs);
|
|
if (rr != dgs) {
|
|
dev_warn(DEV, "short read receiving data digest: read %d expected %d\n",
|
|
rr, dgs);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
data_size -= dgs;
|
|
|
|
ERR_IF(data_size & 0x1ff) return NULL;
|
|
ERR_IF(data_size > DRBD_MAX_SEGMENT_SIZE) return NULL;
|
|
|
|
/* even though we trust out peer,
|
|
* we sometimes have to double check. */
|
|
if (sector + (data_size>>9) > capacity) {
|
|
dev_err(DEV, "capacity: %llus < sector: %llus + size: %u\n",
|
|
(unsigned long long)capacity,
|
|
(unsigned long long)sector, data_size);
|
|
return NULL;
|
|
}
|
|
|
|
/* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD
|
|
* "criss-cross" setup, that might cause write-out on some other DRBD,
|
|
* which in turn might block on the other node at this very place. */
|
|
e = drbd_alloc_ee(mdev, id, sector, data_size, GFP_NOIO);
|
|
if (!e)
|
|
return NULL;
|
|
|
|
ds = data_size;
|
|
page = e->pages;
|
|
page_chain_for_each(page) {
|
|
unsigned len = min_t(int, ds, PAGE_SIZE);
|
|
data = kmap(page);
|
|
rr = drbd_recv(mdev, data, len);
|
|
if (FAULT_ACTIVE(mdev, DRBD_FAULT_RECEIVE)) {
|
|
dev_err(DEV, "Fault injection: Corrupting data on receive\n");
|
|
data[0] = data[0] ^ (unsigned long)-1;
|
|
}
|
|
kunmap(page);
|
|
if (rr != len) {
|
|
drbd_free_ee(mdev, e);
|
|
dev_warn(DEV, "short read receiving data: read %d expected %d\n",
|
|
rr, len);
|
|
return NULL;
|
|
}
|
|
ds -= rr;
|
|
}
|
|
|
|
if (dgs) {
|
|
drbd_csum_ee(mdev, mdev->integrity_r_tfm, e, dig_vv);
|
|
if (memcmp(dig_in, dig_vv, dgs)) {
|
|
dev_err(DEV, "Digest integrity check FAILED.\n");
|
|
drbd_bcast_ee(mdev, "digest failed",
|
|
dgs, dig_in, dig_vv, e);
|
|
drbd_free_ee(mdev, e);
|
|
return NULL;
|
|
}
|
|
}
|
|
mdev->recv_cnt += data_size>>9;
|
|
return e;
|
|
}
|
|
|
|
/* drbd_drain_block() just takes a data block
|
|
* out of the socket input buffer, and discards it.
|
|
*/
|
|
static int drbd_drain_block(struct drbd_conf *mdev, int data_size)
|
|
{
|
|
struct page *page;
|
|
int rr, rv = 1;
|
|
void *data;
|
|
|
|
if (!data_size)
|
|
return TRUE;
|
|
|
|
page = drbd_pp_alloc(mdev, 1, 1);
|
|
|
|
data = kmap(page);
|
|
while (data_size) {
|
|
rr = drbd_recv(mdev, data, min_t(int, data_size, PAGE_SIZE));
|
|
if (rr != min_t(int, data_size, PAGE_SIZE)) {
|
|
rv = 0;
|
|
dev_warn(DEV, "short read receiving data: read %d expected %d\n",
|
|
rr, min_t(int, data_size, PAGE_SIZE));
|
|
break;
|
|
}
|
|
data_size -= rr;
|
|
}
|
|
kunmap(page);
|
|
drbd_pp_free(mdev, page);
|
|
return rv;
|
|
}
|
|
|
|
static int recv_dless_read(struct drbd_conf *mdev, struct drbd_request *req,
|
|
sector_t sector, int data_size)
|
|
{
|
|
struct bio_vec *bvec;
|
|
struct bio *bio;
|
|
int dgs, rr, i, expect;
|
|
void *dig_in = mdev->int_dig_in;
|
|
void *dig_vv = mdev->int_dig_vv;
|
|
|
|
dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_r_tfm) ?
|
|
crypto_hash_digestsize(mdev->integrity_r_tfm) : 0;
|
|
|
|
if (dgs) {
|
|
rr = drbd_recv(mdev, dig_in, dgs);
|
|
if (rr != dgs) {
|
|
dev_warn(DEV, "short read receiving data reply digest: read %d expected %d\n",
|
|
rr, dgs);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
data_size -= dgs;
|
|
|
|
/* optimistically update recv_cnt. if receiving fails below,
|
|
* we disconnect anyways, and counters will be reset. */
|
|
mdev->recv_cnt += data_size>>9;
|
|
|
|
bio = req->master_bio;
|
|
D_ASSERT(sector == bio->bi_sector);
|
|
|
|
bio_for_each_segment(bvec, bio, i) {
|
|
expect = min_t(int, data_size, bvec->bv_len);
|
|
rr = drbd_recv(mdev,
|
|
kmap(bvec->bv_page)+bvec->bv_offset,
|
|
expect);
|
|
kunmap(bvec->bv_page);
|
|
if (rr != expect) {
|
|
dev_warn(DEV, "short read receiving data reply: "
|
|
"read %d expected %d\n",
|
|
rr, expect);
|
|
return 0;
|
|
}
|
|
data_size -= rr;
|
|
}
|
|
|
|
if (dgs) {
|
|
drbd_csum_bio(mdev, mdev->integrity_r_tfm, bio, dig_vv);
|
|
if (memcmp(dig_in, dig_vv, dgs)) {
|
|
dev_err(DEV, "Digest integrity check FAILED. Broken NICs?\n");
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
D_ASSERT(data_size == 0);
|
|
return 1;
|
|
}
|
|
|
|
/* e_end_resync_block() is called via
|
|
* drbd_process_done_ee() by asender only */
|
|
static int e_end_resync_block(struct drbd_conf *mdev, struct drbd_work *w, int unused)
|
|
{
|
|
struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w;
|
|
sector_t sector = e->sector;
|
|
int ok;
|
|
|
|
D_ASSERT(hlist_unhashed(&e->colision));
|
|
|
|
if (likely((e->flags & EE_WAS_ERROR) == 0)) {
|
|
drbd_set_in_sync(mdev, sector, e->size);
|
|
ok = drbd_send_ack(mdev, P_RS_WRITE_ACK, e);
|
|
} else {
|
|
/* Record failure to sync */
|
|
drbd_rs_failed_io(mdev, sector, e->size);
|
|
|
|
ok = drbd_send_ack(mdev, P_NEG_ACK, e);
|
|
}
|
|
dec_unacked(mdev);
|
|
|
|
return ok;
|
|
}
|
|
|
|
static int recv_resync_read(struct drbd_conf *mdev, sector_t sector, int data_size) __releases(local)
|
|
{
|
|
struct drbd_epoch_entry *e;
|
|
|
|
e = read_in_block(mdev, ID_SYNCER, sector, data_size);
|
|
if (!e)
|
|
goto fail;
|
|
|
|
dec_rs_pending(mdev);
|
|
|
|
inc_unacked(mdev);
|
|
/* corresponding dec_unacked() in e_end_resync_block()
|
|
* respective _drbd_clear_done_ee */
|
|
|
|
e->w.cb = e_end_resync_block;
|
|
|
|
spin_lock_irq(&mdev->req_lock);
|
|
list_add(&e->w.list, &mdev->sync_ee);
|
|
spin_unlock_irq(&mdev->req_lock);
|
|
|
|
if (drbd_submit_ee(mdev, e, WRITE, DRBD_FAULT_RS_WR) == 0)
|
|
return TRUE;
|
|
|
|
drbd_free_ee(mdev, e);
|
|
fail:
|
|
put_ldev(mdev);
|
|
return FALSE;
|
|
}
|
|
|
|
static int receive_DataReply(struct drbd_conf *mdev, struct p_header *h)
|
|
{
|
|
struct drbd_request *req;
|
|
sector_t sector;
|
|
unsigned int header_size, data_size;
|
|
int ok;
|
|
struct p_data *p = (struct p_data *)h;
|
|
|
|
header_size = sizeof(*p) - sizeof(*h);
|
|
data_size = h->length - header_size;
|
|
|
|
ERR_IF(data_size == 0) return FALSE;
|
|
|
|
if (drbd_recv(mdev, h->payload, header_size) != header_size)
|
|
return FALSE;
|
|
|
|
sector = be64_to_cpu(p->sector);
|
|
|
|
spin_lock_irq(&mdev->req_lock);
|
|
req = _ar_id_to_req(mdev, p->block_id, sector);
|
|
spin_unlock_irq(&mdev->req_lock);
|
|
if (unlikely(!req)) {
|
|
dev_err(DEV, "Got a corrupt block_id/sector pair(1).\n");
|
|
return FALSE;
|
|
}
|
|
|
|
/* hlist_del(&req->colision) is done in _req_may_be_done, to avoid
|
|
* special casing it there for the various failure cases.
|
|
* still no race with drbd_fail_pending_reads */
|
|
ok = recv_dless_read(mdev, req, sector, data_size);
|
|
|
|
if (ok)
|
|
req_mod(req, data_received);
|
|
/* else: nothing. handled from drbd_disconnect...
|
|
* I don't think we may complete this just yet
|
|
* in case we are "on-disconnect: freeze" */
|
|
|
|
return ok;
|
|
}
|
|
|
|
static int receive_RSDataReply(struct drbd_conf *mdev, struct p_header *h)
|
|
{
|
|
sector_t sector;
|
|
unsigned int header_size, data_size;
|
|
int ok;
|
|
struct p_data *p = (struct p_data *)h;
|
|
|
|
header_size = sizeof(*p) - sizeof(*h);
|
|
data_size = h->length - header_size;
|
|
|
|
ERR_IF(data_size == 0) return FALSE;
|
|
|
|
if (drbd_recv(mdev, h->payload, header_size) != header_size)
|
|
return FALSE;
|
|
|
|
sector = be64_to_cpu(p->sector);
|
|
D_ASSERT(p->block_id == ID_SYNCER);
|
|
|
|
if (get_ldev(mdev)) {
|
|
/* data is submitted to disk within recv_resync_read.
|
|
* corresponding put_ldev done below on error,
|
|
* or in drbd_endio_write_sec. */
|
|
ok = recv_resync_read(mdev, sector, data_size);
|
|
} else {
|
|
if (__ratelimit(&drbd_ratelimit_state))
|
|
dev_err(DEV, "Can not write resync data to local disk.\n");
|
|
|
|
ok = drbd_drain_block(mdev, data_size);
|
|
|
|
drbd_send_ack_dp(mdev, P_NEG_ACK, p);
|
|
}
|
|
|
|
return ok;
|
|
}
|
|
|
|
/* e_end_block() is called via drbd_process_done_ee().
|
|
* this means this function only runs in the asender thread
|
|
*/
|
|
static int e_end_block(struct drbd_conf *mdev, struct drbd_work *w, int cancel)
|
|
{
|
|
struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w;
|
|
sector_t sector = e->sector;
|
|
struct drbd_epoch *epoch;
|
|
int ok = 1, pcmd;
|
|
|
|
if (e->flags & EE_IS_BARRIER) {
|
|
epoch = previous_epoch(mdev, e->epoch);
|
|
if (epoch)
|
|
drbd_may_finish_epoch(mdev, epoch, EV_BARRIER_DONE + (cancel ? EV_CLEANUP : 0));
|
|
}
|
|
|
|
if (mdev->net_conf->wire_protocol == DRBD_PROT_C) {
|
|
if (likely((e->flags & EE_WAS_ERROR) == 0)) {
|
|
pcmd = (mdev->state.conn >= C_SYNC_SOURCE &&
|
|
mdev->state.conn <= C_PAUSED_SYNC_T &&
|
|
e->flags & EE_MAY_SET_IN_SYNC) ?
|
|
P_RS_WRITE_ACK : P_WRITE_ACK;
|
|
ok &= drbd_send_ack(mdev, pcmd, e);
|
|
if (pcmd == P_RS_WRITE_ACK)
|
|
drbd_set_in_sync(mdev, sector, e->size);
|
|
} else {
|
|
ok = drbd_send_ack(mdev, P_NEG_ACK, e);
|
|
/* we expect it to be marked out of sync anyways...
|
|
* maybe assert this? */
|
|
}
|
|
dec_unacked(mdev);
|
|
}
|
|
/* we delete from the conflict detection hash _after_ we sent out the
|
|
* P_WRITE_ACK / P_NEG_ACK, to get the sequence number right. */
|
|
if (mdev->net_conf->two_primaries) {
|
|
spin_lock_irq(&mdev->req_lock);
|
|
D_ASSERT(!hlist_unhashed(&e->colision));
|
|
hlist_del_init(&e->colision);
|
|
spin_unlock_irq(&mdev->req_lock);
|
|
} else {
|
|
D_ASSERT(hlist_unhashed(&e->colision));
|
|
}
|
|
|
|
drbd_may_finish_epoch(mdev, e->epoch, EV_PUT + (cancel ? EV_CLEANUP : 0));
|
|
|
|
return ok;
|
|
}
|
|
|
|
static int e_send_discard_ack(struct drbd_conf *mdev, struct drbd_work *w, int unused)
|
|
{
|
|
struct drbd_epoch_entry *e = (struct drbd_epoch_entry *)w;
|
|
int ok = 1;
|
|
|
|
D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C);
|
|
ok = drbd_send_ack(mdev, P_DISCARD_ACK, e);
|
|
|
|
spin_lock_irq(&mdev->req_lock);
|
|
D_ASSERT(!hlist_unhashed(&e->colision));
|
|
hlist_del_init(&e->colision);
|
|
spin_unlock_irq(&mdev->req_lock);
|
|
|
|
dec_unacked(mdev);
|
|
|
|
return ok;
|
|
}
|
|
|
|
/* Called from receive_Data.
|
|
* Synchronize packets on sock with packets on msock.
|
|
*
|
|
* This is here so even when a P_DATA packet traveling via sock overtook an Ack
|
|
* packet traveling on msock, they are still processed in the order they have
|
|
* been sent.
|
|
*
|
|
* Note: we don't care for Ack packets overtaking P_DATA packets.
|
|
*
|
|
* In case packet_seq is larger than mdev->peer_seq number, there are
|
|
* outstanding packets on the msock. We wait for them to arrive.
|
|
* In case we are the logically next packet, we update mdev->peer_seq
|
|
* ourselves. Correctly handles 32bit wrap around.
|
|
*
|
|
* Assume we have a 10 GBit connection, that is about 1<<30 byte per second,
|
|
* about 1<<21 sectors per second. So "worst" case, we have 1<<3 == 8 seconds
|
|
* for the 24bit wrap (historical atomic_t guarantee on some archs), and we have
|
|
* 1<<9 == 512 seconds aka ages for the 32bit wrap around...
|
|
*
|
|
* returns 0 if we may process the packet,
|
|
* -ERESTARTSYS if we were interrupted (by disconnect signal). */
|
|
static int drbd_wait_peer_seq(struct drbd_conf *mdev, const u32 packet_seq)
|
|
{
|
|
DEFINE_WAIT(wait);
|
|
unsigned int p_seq;
|
|
long timeout;
|
|
int ret = 0;
|
|
spin_lock(&mdev->peer_seq_lock);
|
|
for (;;) {
|
|
prepare_to_wait(&mdev->seq_wait, &wait, TASK_INTERRUPTIBLE);
|
|
if (seq_le(packet_seq, mdev->peer_seq+1))
|
|
break;
|
|
if (signal_pending(current)) {
|
|
ret = -ERESTARTSYS;
|
|
break;
|
|
}
|
|
p_seq = mdev->peer_seq;
|
|
spin_unlock(&mdev->peer_seq_lock);
|
|
timeout = schedule_timeout(30*HZ);
|
|
spin_lock(&mdev->peer_seq_lock);
|
|
if (timeout == 0 && p_seq == mdev->peer_seq) {
|
|
ret = -ETIMEDOUT;
|
|
dev_err(DEV, "ASSERT FAILED waited 30 seconds for sequence update, forcing reconnect\n");
|
|
break;
|
|
}
|
|
}
|
|
finish_wait(&mdev->seq_wait, &wait);
|
|
if (mdev->peer_seq+1 == packet_seq)
|
|
mdev->peer_seq++;
|
|
spin_unlock(&mdev->peer_seq_lock);
|
|
return ret;
|
|
}
|
|
|
|
/* mirrored write */
|
|
static int receive_Data(struct drbd_conf *mdev, struct p_header *h)
|
|
{
|
|
sector_t sector;
|
|
struct drbd_epoch_entry *e;
|
|
struct p_data *p = (struct p_data *)h;
|
|
int header_size, data_size;
|
|
int rw = WRITE;
|
|
u32 dp_flags;
|
|
|
|
header_size = sizeof(*p) - sizeof(*h);
|
|
data_size = h->length - header_size;
|
|
|
|
ERR_IF(data_size == 0) return FALSE;
|
|
|
|
if (drbd_recv(mdev, h->payload, header_size) != header_size)
|
|
return FALSE;
|
|
|
|
if (!get_ldev(mdev)) {
|
|
if (__ratelimit(&drbd_ratelimit_state))
|
|
dev_err(DEV, "Can not write mirrored data block "
|
|
"to local disk.\n");
|
|
spin_lock(&mdev->peer_seq_lock);
|
|
if (mdev->peer_seq+1 == be32_to_cpu(p->seq_num))
|
|
mdev->peer_seq++;
|
|
spin_unlock(&mdev->peer_seq_lock);
|
|
|
|
drbd_send_ack_dp(mdev, P_NEG_ACK, p);
|
|
atomic_inc(&mdev->current_epoch->epoch_size);
|
|
return drbd_drain_block(mdev, data_size);
|
|
}
|
|
|
|
/* get_ldev(mdev) successful.
|
|
* Corresponding put_ldev done either below (on various errors),
|
|
* or in drbd_endio_write_sec, if we successfully submit the data at
|
|
* the end of this function. */
|
|
|
|
sector = be64_to_cpu(p->sector);
|
|
e = read_in_block(mdev, p->block_id, sector, data_size);
|
|
if (!e) {
|
|
put_ldev(mdev);
|
|
return FALSE;
|
|
}
|
|
|
|
e->w.cb = e_end_block;
|
|
|
|
spin_lock(&mdev->epoch_lock);
|
|
e->epoch = mdev->current_epoch;
|
|
atomic_inc(&e->epoch->epoch_size);
|
|
atomic_inc(&e->epoch->active);
|
|
|
|
if (mdev->write_ordering == WO_bio_barrier && atomic_read(&e->epoch->epoch_size) == 1) {
|
|
struct drbd_epoch *epoch;
|
|
/* Issue a barrier if we start a new epoch, and the previous epoch
|
|
was not a epoch containing a single request which already was
|
|
a Barrier. */
|
|
epoch = list_entry(e->epoch->list.prev, struct drbd_epoch, list);
|
|
if (epoch == e->epoch) {
|
|
set_bit(DE_CONTAINS_A_BARRIER, &e->epoch->flags);
|
|
rw |= REQ_HARDBARRIER;
|
|
e->flags |= EE_IS_BARRIER;
|
|
} else {
|
|
if (atomic_read(&epoch->epoch_size) > 1 ||
|
|
!test_bit(DE_CONTAINS_A_BARRIER, &epoch->flags)) {
|
|
set_bit(DE_BARRIER_IN_NEXT_EPOCH_ISSUED, &epoch->flags);
|
|
set_bit(DE_CONTAINS_A_BARRIER, &e->epoch->flags);
|
|
rw |= REQ_HARDBARRIER;
|
|
e->flags |= EE_IS_BARRIER;
|
|
}
|
|
}
|
|
}
|
|
spin_unlock(&mdev->epoch_lock);
|
|
|
|
dp_flags = be32_to_cpu(p->dp_flags);
|
|
if (dp_flags & DP_HARDBARRIER) {
|
|
dev_err(DEV, "ASSERT FAILED would have submitted barrier request\n");
|
|
/* rw |= REQ_HARDBARRIER; */
|
|
}
|
|
if (dp_flags & DP_RW_SYNC)
|
|
rw |= REQ_SYNC | REQ_UNPLUG;
|
|
if (dp_flags & DP_MAY_SET_IN_SYNC)
|
|
e->flags |= EE_MAY_SET_IN_SYNC;
|
|
|
|
/* I'm the receiver, I do hold a net_cnt reference. */
|
|
if (!mdev->net_conf->two_primaries) {
|
|
spin_lock_irq(&mdev->req_lock);
|
|
} else {
|
|
/* don't get the req_lock yet,
|
|
* we may sleep in drbd_wait_peer_seq */
|
|
const int size = e->size;
|
|
const int discard = test_bit(DISCARD_CONCURRENT, &mdev->flags);
|
|
DEFINE_WAIT(wait);
|
|
struct drbd_request *i;
|
|
struct hlist_node *n;
|
|
struct hlist_head *slot;
|
|
int first;
|
|
|
|
D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C);
|
|
BUG_ON(mdev->ee_hash == NULL);
|
|
BUG_ON(mdev->tl_hash == NULL);
|
|
|
|
/* conflict detection and handling:
|
|
* 1. wait on the sequence number,
|
|
* in case this data packet overtook ACK packets.
|
|
* 2. check our hash tables for conflicting requests.
|
|
* we only need to walk the tl_hash, since an ee can not
|
|
* have a conflict with an other ee: on the submitting
|
|
* node, the corresponding req had already been conflicting,
|
|
* and a conflicting req is never sent.
|
|
*
|
|
* Note: for two_primaries, we are protocol C,
|
|
* so there cannot be any request that is DONE
|
|
* but still on the transfer log.
|
|
*
|
|
* unconditionally add to the ee_hash.
|
|
*
|
|
* if no conflicting request is found:
|
|
* submit.
|
|
*
|
|
* if any conflicting request is found
|
|
* that has not yet been acked,
|
|
* AND I have the "discard concurrent writes" flag:
|
|
* queue (via done_ee) the P_DISCARD_ACK; OUT.
|
|
*
|
|
* if any conflicting request is found:
|
|
* block the receiver, waiting on misc_wait
|
|
* until no more conflicting requests are there,
|
|
* or we get interrupted (disconnect).
|
|
*
|
|
* we do not just write after local io completion of those
|
|
* requests, but only after req is done completely, i.e.
|
|
* we wait for the P_DISCARD_ACK to arrive!
|
|
*
|
|
* then proceed normally, i.e. submit.
|
|
*/
|
|
if (drbd_wait_peer_seq(mdev, be32_to_cpu(p->seq_num)))
|
|
goto out_interrupted;
|
|
|
|
spin_lock_irq(&mdev->req_lock);
|
|
|
|
hlist_add_head(&e->colision, ee_hash_slot(mdev, sector));
|
|
|
|
#define OVERLAPS overlaps(i->sector, i->size, sector, size)
|
|
slot = tl_hash_slot(mdev, sector);
|
|
first = 1;
|
|
for (;;) {
|
|
int have_unacked = 0;
|
|
int have_conflict = 0;
|
|
prepare_to_wait(&mdev->misc_wait, &wait,
|
|
TASK_INTERRUPTIBLE);
|
|
hlist_for_each_entry(i, n, slot, colision) {
|
|
if (OVERLAPS) {
|
|
/* only ALERT on first iteration,
|
|
* we may be woken up early... */
|
|
if (first)
|
|
dev_alert(DEV, "%s[%u] Concurrent local write detected!"
|
|
" new: %llus +%u; pending: %llus +%u\n",
|
|
current->comm, current->pid,
|
|
(unsigned long long)sector, size,
|
|
(unsigned long long)i->sector, i->size);
|
|
if (i->rq_state & RQ_NET_PENDING)
|
|
++have_unacked;
|
|
++have_conflict;
|
|
}
|
|
}
|
|
#undef OVERLAPS
|
|
if (!have_conflict)
|
|
break;
|
|
|
|
/* Discard Ack only for the _first_ iteration */
|
|
if (first && discard && have_unacked) {
|
|
dev_alert(DEV, "Concurrent write! [DISCARD BY FLAG] sec=%llus\n",
|
|
(unsigned long long)sector);
|
|
inc_unacked(mdev);
|
|
e->w.cb = e_send_discard_ack;
|
|
list_add_tail(&e->w.list, &mdev->done_ee);
|
|
|
|
spin_unlock_irq(&mdev->req_lock);
|
|
|
|
/* we could probably send that P_DISCARD_ACK ourselves,
|
|
* but I don't like the receiver using the msock */
|
|
|
|
put_ldev(mdev);
|
|
wake_asender(mdev);
|
|
finish_wait(&mdev->misc_wait, &wait);
|
|
return TRUE;
|
|
}
|
|
|
|
if (signal_pending(current)) {
|
|
hlist_del_init(&e->colision);
|
|
|
|
spin_unlock_irq(&mdev->req_lock);
|
|
|
|
finish_wait(&mdev->misc_wait, &wait);
|
|
goto out_interrupted;
|
|
}
|
|
|
|
spin_unlock_irq(&mdev->req_lock);
|
|
if (first) {
|
|
first = 0;
|
|
dev_alert(DEV, "Concurrent write! [W AFTERWARDS] "
|
|
"sec=%llus\n", (unsigned long long)sector);
|
|
} else if (discard) {
|
|
/* we had none on the first iteration.
|
|
* there must be none now. */
|
|
D_ASSERT(have_unacked == 0);
|
|
}
|
|
schedule();
|
|
spin_lock_irq(&mdev->req_lock);
|
|
}
|
|
finish_wait(&mdev->misc_wait, &wait);
|
|
}
|
|
|
|
list_add(&e->w.list, &mdev->active_ee);
|
|
spin_unlock_irq(&mdev->req_lock);
|
|
|
|
switch (mdev->net_conf->wire_protocol) {
|
|
case DRBD_PROT_C:
|
|
inc_unacked(mdev);
|
|
/* corresponding dec_unacked() in e_end_block()
|
|
* respective _drbd_clear_done_ee */
|
|
break;
|
|
case DRBD_PROT_B:
|
|
/* I really don't like it that the receiver thread
|
|
* sends on the msock, but anyways */
|
|
drbd_send_ack(mdev, P_RECV_ACK, e);
|
|
break;
|
|
case DRBD_PROT_A:
|
|
/* nothing to do */
|
|
break;
|
|
}
|
|
|
|
if (mdev->state.pdsk == D_DISKLESS) {
|
|
/* In case we have the only disk of the cluster, */
|
|
drbd_set_out_of_sync(mdev, e->sector, e->size);
|
|
e->flags |= EE_CALL_AL_COMPLETE_IO;
|
|
drbd_al_begin_io(mdev, e->sector);
|
|
}
|
|
|
|
if (drbd_submit_ee(mdev, e, rw, DRBD_FAULT_DT_WR) == 0)
|
|
return TRUE;
|
|
|
|
out_interrupted:
|
|
/* yes, the epoch_size now is imbalanced.
|
|
* but we drop the connection anyways, so we don't have a chance to
|
|
* receive a barrier... atomic_inc(&mdev->epoch_size); */
|
|
put_ldev(mdev);
|
|
drbd_free_ee(mdev, e);
|
|
return FALSE;
|
|
}
|
|
|
|
static int receive_DataRequest(struct drbd_conf *mdev, struct p_header *h)
|
|
{
|
|
sector_t sector;
|
|
const sector_t capacity = drbd_get_capacity(mdev->this_bdev);
|
|
struct drbd_epoch_entry *e;
|
|
struct digest_info *di = NULL;
|
|
int size, digest_size;
|
|
unsigned int fault_type;
|
|
struct p_block_req *p =
|
|
(struct p_block_req *)h;
|
|
const int brps = sizeof(*p)-sizeof(*h);
|
|
|
|
if (drbd_recv(mdev, h->payload, brps) != brps)
|
|
return FALSE;
|
|
|
|
sector = be64_to_cpu(p->sector);
|
|
size = be32_to_cpu(p->blksize);
|
|
|
|
if (size <= 0 || (size & 0x1ff) != 0 || size > DRBD_MAX_SEGMENT_SIZE) {
|
|
dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__,
|
|
(unsigned long long)sector, size);
|
|
return FALSE;
|
|
}
|
|
if (sector + (size>>9) > capacity) {
|
|
dev_err(DEV, "%s:%d: sector: %llus, size: %u\n", __FILE__, __LINE__,
|
|
(unsigned long long)sector, size);
|
|
return FALSE;
|
|
}
|
|
|
|
if (!get_ldev_if_state(mdev, D_UP_TO_DATE)) {
|
|
if (__ratelimit(&drbd_ratelimit_state))
|
|
dev_err(DEV, "Can not satisfy peer's read request, "
|
|
"no local data.\n");
|
|
drbd_send_ack_rp(mdev, h->command == P_DATA_REQUEST ? P_NEG_DREPLY :
|
|
P_NEG_RS_DREPLY , p);
|
|
return drbd_drain_block(mdev, h->length - brps);
|
|
}
|
|
|
|
/* GFP_NOIO, because we must not cause arbitrary write-out: in a DRBD
|
|
* "criss-cross" setup, that might cause write-out on some other DRBD,
|
|
* which in turn might block on the other node at this very place. */
|
|
e = drbd_alloc_ee(mdev, p->block_id, sector, size, GFP_NOIO);
|
|
if (!e) {
|
|
put_ldev(mdev);
|
|
return FALSE;
|
|
}
|
|
|
|
switch (h->command) {
|
|
case P_DATA_REQUEST:
|
|
e->w.cb = w_e_end_data_req;
|
|
fault_type = DRBD_FAULT_DT_RD;
|
|
break;
|
|
case P_RS_DATA_REQUEST:
|
|
e->w.cb = w_e_end_rsdata_req;
|
|
fault_type = DRBD_FAULT_RS_RD;
|
|
/* Eventually this should become asynchronously. Currently it
|
|
* blocks the whole receiver just to delay the reading of a
|
|
* resync data block.
|
|
* the drbd_work_queue mechanism is made for this...
|
|
*/
|
|
if (!drbd_rs_begin_io(mdev, sector)) {
|
|
/* we have been interrupted,
|
|
* probably connection lost! */
|
|
D_ASSERT(signal_pending(current));
|
|
goto out_free_e;
|
|
}
|
|
break;
|
|
|
|
case P_OV_REPLY:
|
|
case P_CSUM_RS_REQUEST:
|
|
fault_type = DRBD_FAULT_RS_RD;
|
|
digest_size = h->length - brps ;
|
|
di = kmalloc(sizeof(*di) + digest_size, GFP_NOIO);
|
|
if (!di)
|
|
goto out_free_e;
|
|
|
|
di->digest_size = digest_size;
|
|
di->digest = (((char *)di)+sizeof(struct digest_info));
|
|
|
|
if (drbd_recv(mdev, di->digest, digest_size) != digest_size)
|
|
goto out_free_e;
|
|
|
|
e->block_id = (u64)(unsigned long)di;
|
|
if (h->command == P_CSUM_RS_REQUEST) {
|
|
D_ASSERT(mdev->agreed_pro_version >= 89);
|
|
e->w.cb = w_e_end_csum_rs_req;
|
|
} else if (h->command == P_OV_REPLY) {
|
|
e->w.cb = w_e_end_ov_reply;
|
|
dec_rs_pending(mdev);
|
|
break;
|
|
}
|
|
|
|
if (!drbd_rs_begin_io(mdev, sector)) {
|
|
/* we have been interrupted, probably connection lost! */
|
|
D_ASSERT(signal_pending(current));
|
|
goto out_free_e;
|
|
}
|
|
break;
|
|
|
|
case P_OV_REQUEST:
|
|
if (mdev->state.conn >= C_CONNECTED &&
|
|
mdev->state.conn != C_VERIFY_T)
|
|
dev_warn(DEV, "ASSERT FAILED: got P_OV_REQUEST while being %s\n",
|
|
drbd_conn_str(mdev->state.conn));
|
|
if (mdev->ov_start_sector == ~(sector_t)0 &&
|
|
mdev->agreed_pro_version >= 90) {
|
|
mdev->ov_start_sector = sector;
|
|
mdev->ov_position = sector;
|
|
mdev->ov_left = mdev->rs_total - BM_SECT_TO_BIT(sector);
|
|
dev_info(DEV, "Online Verify start sector: %llu\n",
|
|
(unsigned long long)sector);
|
|
}
|
|
e->w.cb = w_e_end_ov_req;
|
|
fault_type = DRBD_FAULT_RS_RD;
|
|
/* Eventually this should become asynchronous. Currently it
|
|
* blocks the whole receiver just to delay the reading of a
|
|
* resync data block.
|
|
* the drbd_work_queue mechanism is made for this...
|
|
*/
|
|
if (!drbd_rs_begin_io(mdev, sector)) {
|
|
/* we have been interrupted,
|
|
* probably connection lost! */
|
|
D_ASSERT(signal_pending(current));
|
|
goto out_free_e;
|
|
}
|
|
break;
|
|
|
|
|
|
default:
|
|
dev_err(DEV, "unexpected command (%s) in receive_DataRequest\n",
|
|
cmdname(h->command));
|
|
fault_type = DRBD_FAULT_MAX;
|
|
}
|
|
|
|
spin_lock_irq(&mdev->req_lock);
|
|
list_add(&e->w.list, &mdev->read_ee);
|
|
spin_unlock_irq(&mdev->req_lock);
|
|
|
|
inc_unacked(mdev);
|
|
|
|
if (drbd_submit_ee(mdev, e, READ, fault_type) == 0)
|
|
return TRUE;
|
|
|
|
out_free_e:
|
|
kfree(di);
|
|
put_ldev(mdev);
|
|
drbd_free_ee(mdev, e);
|
|
return FALSE;
|
|
}
|
|
|
|
static int drbd_asb_recover_0p(struct drbd_conf *mdev) __must_hold(local)
|
|
{
|
|
int self, peer, rv = -100;
|
|
unsigned long ch_self, ch_peer;
|
|
|
|
self = mdev->ldev->md.uuid[UI_BITMAP] & 1;
|
|
peer = mdev->p_uuid[UI_BITMAP] & 1;
|
|
|
|
ch_peer = mdev->p_uuid[UI_SIZE];
|
|
ch_self = mdev->comm_bm_set;
|
|
|
|
switch (mdev->net_conf->after_sb_0p) {
|
|
case ASB_CONSENSUS:
|
|
case ASB_DISCARD_SECONDARY:
|
|
case ASB_CALL_HELPER:
|
|
dev_err(DEV, "Configuration error.\n");
|
|
break;
|
|
case ASB_DISCONNECT:
|
|
break;
|
|
case ASB_DISCARD_YOUNGER_PRI:
|
|
if (self == 0 && peer == 1) {
|
|
rv = -1;
|
|
break;
|
|
}
|
|
if (self == 1 && peer == 0) {
|
|
rv = 1;
|
|
break;
|
|
}
|
|
/* Else fall through to one of the other strategies... */
|
|
case ASB_DISCARD_OLDER_PRI:
|
|
if (self == 0 && peer == 1) {
|
|
rv = 1;
|
|
break;
|
|
}
|
|
if (self == 1 && peer == 0) {
|
|
rv = -1;
|
|
break;
|
|
}
|
|
/* Else fall through to one of the other strategies... */
|
|
dev_warn(DEV, "Discard younger/older primary did not find a decision\n"
|
|
"Using discard-least-changes instead\n");
|
|
case ASB_DISCARD_ZERO_CHG:
|
|
if (ch_peer == 0 && ch_self == 0) {
|
|
rv = test_bit(DISCARD_CONCURRENT, &mdev->flags)
|
|
? -1 : 1;
|
|
break;
|
|
} else {
|
|
if (ch_peer == 0) { rv = 1; break; }
|
|
if (ch_self == 0) { rv = -1; break; }
|
|
}
|
|
if (mdev->net_conf->after_sb_0p == ASB_DISCARD_ZERO_CHG)
|
|
break;
|
|
case ASB_DISCARD_LEAST_CHG:
|
|
if (ch_self < ch_peer)
|
|
rv = -1;
|
|
else if (ch_self > ch_peer)
|
|
rv = 1;
|
|
else /* ( ch_self == ch_peer ) */
|
|
/* Well, then use something else. */
|
|
rv = test_bit(DISCARD_CONCURRENT, &mdev->flags)
|
|
? -1 : 1;
|
|
break;
|
|
case ASB_DISCARD_LOCAL:
|
|
rv = -1;
|
|
break;
|
|
case ASB_DISCARD_REMOTE:
|
|
rv = 1;
|
|
}
|
|
|
|
return rv;
|
|
}
|
|
|
|
static int drbd_asb_recover_1p(struct drbd_conf *mdev) __must_hold(local)
|
|
{
|
|
int self, peer, hg, rv = -100;
|
|
|
|
self = mdev->ldev->md.uuid[UI_BITMAP] & 1;
|
|
peer = mdev->p_uuid[UI_BITMAP] & 1;
|
|
|
|
switch (mdev->net_conf->after_sb_1p) {
|
|
case ASB_DISCARD_YOUNGER_PRI:
|
|
case ASB_DISCARD_OLDER_PRI:
|
|
case ASB_DISCARD_LEAST_CHG:
|
|
case ASB_DISCARD_LOCAL:
|
|
case ASB_DISCARD_REMOTE:
|
|
dev_err(DEV, "Configuration error.\n");
|
|
break;
|
|
case ASB_DISCONNECT:
|
|
break;
|
|
case ASB_CONSENSUS:
|
|
hg = drbd_asb_recover_0p(mdev);
|
|
if (hg == -1 && mdev->state.role == R_SECONDARY)
|
|
rv = hg;
|
|
if (hg == 1 && mdev->state.role == R_PRIMARY)
|
|
rv = hg;
|
|
break;
|
|
case ASB_VIOLENTLY:
|
|
rv = drbd_asb_recover_0p(mdev);
|
|
break;
|
|
case ASB_DISCARD_SECONDARY:
|
|
return mdev->state.role == R_PRIMARY ? 1 : -1;
|
|
case ASB_CALL_HELPER:
|
|
hg = drbd_asb_recover_0p(mdev);
|
|
if (hg == -1 && mdev->state.role == R_PRIMARY) {
|
|
self = drbd_set_role(mdev, R_SECONDARY, 0);
|
|
/* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE,
|
|
* we might be here in C_WF_REPORT_PARAMS which is transient.
|
|
* we do not need to wait for the after state change work either. */
|
|
self = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY));
|
|
if (self != SS_SUCCESS) {
|
|
drbd_khelper(mdev, "pri-lost-after-sb");
|
|
} else {
|
|
dev_warn(DEV, "Successfully gave up primary role.\n");
|
|
rv = hg;
|
|
}
|
|
} else
|
|
rv = hg;
|
|
}
|
|
|
|
return rv;
|
|
}
|
|
|
|
static int drbd_asb_recover_2p(struct drbd_conf *mdev) __must_hold(local)
|
|
{
|
|
int self, peer, hg, rv = -100;
|
|
|
|
self = mdev->ldev->md.uuid[UI_BITMAP] & 1;
|
|
peer = mdev->p_uuid[UI_BITMAP] & 1;
|
|
|
|
switch (mdev->net_conf->after_sb_2p) {
|
|
case ASB_DISCARD_YOUNGER_PRI:
|
|
case ASB_DISCARD_OLDER_PRI:
|
|
case ASB_DISCARD_LEAST_CHG:
|
|
case ASB_DISCARD_LOCAL:
|
|
case ASB_DISCARD_REMOTE:
|
|
case ASB_CONSENSUS:
|
|
case ASB_DISCARD_SECONDARY:
|
|
dev_err(DEV, "Configuration error.\n");
|
|
break;
|
|
case ASB_VIOLENTLY:
|
|
rv = drbd_asb_recover_0p(mdev);
|
|
break;
|
|
case ASB_DISCONNECT:
|
|
break;
|
|
case ASB_CALL_HELPER:
|
|
hg = drbd_asb_recover_0p(mdev);
|
|
if (hg == -1) {
|
|
/* drbd_change_state() does not sleep while in SS_IN_TRANSIENT_STATE,
|
|
* we might be here in C_WF_REPORT_PARAMS which is transient.
|
|
* we do not need to wait for the after state change work either. */
|
|
self = drbd_change_state(mdev, CS_VERBOSE, NS(role, R_SECONDARY));
|
|
if (self != SS_SUCCESS) {
|
|
drbd_khelper(mdev, "pri-lost-after-sb");
|
|
} else {
|
|
dev_warn(DEV, "Successfully gave up primary role.\n");
|
|
rv = hg;
|
|
}
|
|
} else
|
|
rv = hg;
|
|
}
|
|
|
|
return rv;
|
|
}
|
|
|
|
static void drbd_uuid_dump(struct drbd_conf *mdev, char *text, u64 *uuid,
|
|
u64 bits, u64 flags)
|
|
{
|
|
if (!uuid) {
|
|
dev_info(DEV, "%s uuid info vanished while I was looking!\n", text);
|
|
return;
|
|
}
|
|
dev_info(DEV, "%s %016llX:%016llX:%016llX:%016llX bits:%llu flags:%llX\n",
|
|
text,
|
|
(unsigned long long)uuid[UI_CURRENT],
|
|
(unsigned long long)uuid[UI_BITMAP],
|
|
(unsigned long long)uuid[UI_HISTORY_START],
|
|
(unsigned long long)uuid[UI_HISTORY_END],
|
|
(unsigned long long)bits,
|
|
(unsigned long long)flags);
|
|
}
|
|
|
|
/*
|
|
100 after split brain try auto recover
|
|
2 C_SYNC_SOURCE set BitMap
|
|
1 C_SYNC_SOURCE use BitMap
|
|
0 no Sync
|
|
-1 C_SYNC_TARGET use BitMap
|
|
-2 C_SYNC_TARGET set BitMap
|
|
-100 after split brain, disconnect
|
|
-1000 unrelated data
|
|
*/
|
|
static int drbd_uuid_compare(struct drbd_conf *mdev, int *rule_nr) __must_hold(local)
|
|
{
|
|
u64 self, peer;
|
|
int i, j;
|
|
|
|
self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1);
|
|
peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1);
|
|
|
|
*rule_nr = 10;
|
|
if (self == UUID_JUST_CREATED && peer == UUID_JUST_CREATED)
|
|
return 0;
|
|
|
|
*rule_nr = 20;
|
|
if ((self == UUID_JUST_CREATED || self == (u64)0) &&
|
|
peer != UUID_JUST_CREATED)
|
|
return -2;
|
|
|
|
*rule_nr = 30;
|
|
if (self != UUID_JUST_CREATED &&
|
|
(peer == UUID_JUST_CREATED || peer == (u64)0))
|
|
return 2;
|
|
|
|
if (self == peer) {
|
|
int rct, dc; /* roles at crash time */
|
|
|
|
if (mdev->p_uuid[UI_BITMAP] == (u64)0 && mdev->ldev->md.uuid[UI_BITMAP] != (u64)0) {
|
|
|
|
if (mdev->agreed_pro_version < 91)
|
|
return -1001;
|
|
|
|
if ((mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1)) &&
|
|
(mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1))) {
|
|
dev_info(DEV, "was SyncSource, missed the resync finished event, corrected myself:\n");
|
|
drbd_uuid_set_bm(mdev, 0UL);
|
|
|
|
drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid,
|
|
mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0);
|
|
*rule_nr = 34;
|
|
} else {
|
|
dev_info(DEV, "was SyncSource (peer failed to write sync_uuid)\n");
|
|
*rule_nr = 36;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
if (mdev->ldev->md.uuid[UI_BITMAP] == (u64)0 && mdev->p_uuid[UI_BITMAP] != (u64)0) {
|
|
|
|
if (mdev->agreed_pro_version < 91)
|
|
return -1001;
|
|
|
|
if ((mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (mdev->p_uuid[UI_BITMAP] & ~((u64)1)) &&
|
|
(mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) == (mdev->p_uuid[UI_HISTORY_START] & ~((u64)1))) {
|
|
dev_info(DEV, "was SyncTarget, peer missed the resync finished event, corrected peer:\n");
|
|
|
|
mdev->p_uuid[UI_HISTORY_START + 1] = mdev->p_uuid[UI_HISTORY_START];
|
|
mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_BITMAP];
|
|
mdev->p_uuid[UI_BITMAP] = 0UL;
|
|
|
|
drbd_uuid_dump(mdev, "peer", mdev->p_uuid, mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]);
|
|
*rule_nr = 35;
|
|
} else {
|
|
dev_info(DEV, "was SyncTarget (failed to write sync_uuid)\n");
|
|
*rule_nr = 37;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
/* Common power [off|failure] */
|
|
rct = (test_bit(CRASHED_PRIMARY, &mdev->flags) ? 1 : 0) +
|
|
(mdev->p_uuid[UI_FLAGS] & 2);
|
|
/* lowest bit is set when we were primary,
|
|
* next bit (weight 2) is set when peer was primary */
|
|
*rule_nr = 40;
|
|
|
|
switch (rct) {
|
|
case 0: /* !self_pri && !peer_pri */ return 0;
|
|
case 1: /* self_pri && !peer_pri */ return 1;
|
|
case 2: /* !self_pri && peer_pri */ return -1;
|
|
case 3: /* self_pri && peer_pri */
|
|
dc = test_bit(DISCARD_CONCURRENT, &mdev->flags);
|
|
return dc ? -1 : 1;
|
|
}
|
|
}
|
|
|
|
*rule_nr = 50;
|
|
peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1);
|
|
if (self == peer)
|
|
return -1;
|
|
|
|
*rule_nr = 51;
|
|
peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1);
|
|
if (self == peer) {
|
|
self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1);
|
|
peer = mdev->p_uuid[UI_HISTORY_START + 1] & ~((u64)1);
|
|
if (self == peer) {
|
|
/* The last P_SYNC_UUID did not get though. Undo the last start of
|
|
resync as sync source modifications of the peer's UUIDs. */
|
|
|
|
if (mdev->agreed_pro_version < 91)
|
|
return -1001;
|
|
|
|
mdev->p_uuid[UI_BITMAP] = mdev->p_uuid[UI_HISTORY_START];
|
|
mdev->p_uuid[UI_HISTORY_START] = mdev->p_uuid[UI_HISTORY_START + 1];
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
*rule_nr = 60;
|
|
self = mdev->ldev->md.uuid[UI_CURRENT] & ~((u64)1);
|
|
for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) {
|
|
peer = mdev->p_uuid[i] & ~((u64)1);
|
|
if (self == peer)
|
|
return -2;
|
|
}
|
|
|
|
*rule_nr = 70;
|
|
self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1);
|
|
peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1);
|
|
if (self == peer)
|
|
return 1;
|
|
|
|
*rule_nr = 71;
|
|
self = mdev->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1);
|
|
if (self == peer) {
|
|
self = mdev->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1);
|
|
peer = mdev->p_uuid[UI_HISTORY_START] & ~((u64)1);
|
|
if (self == peer) {
|
|
/* The last P_SYNC_UUID did not get though. Undo the last start of
|
|
resync as sync source modifications of our UUIDs. */
|
|
|
|
if (mdev->agreed_pro_version < 91)
|
|
return -1001;
|
|
|
|
_drbd_uuid_set(mdev, UI_BITMAP, mdev->ldev->md.uuid[UI_HISTORY_START]);
|
|
_drbd_uuid_set(mdev, UI_HISTORY_START, mdev->ldev->md.uuid[UI_HISTORY_START + 1]);
|
|
|
|
dev_info(DEV, "Undid last start of resync:\n");
|
|
|
|
drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid,
|
|
mdev->state.disk >= D_NEGOTIATING ? drbd_bm_total_weight(mdev) : 0, 0);
|
|
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
|
|
*rule_nr = 80;
|
|
peer = mdev->p_uuid[UI_CURRENT] & ~((u64)1);
|
|
for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) {
|
|
self = mdev->ldev->md.uuid[i] & ~((u64)1);
|
|
if (self == peer)
|
|
return 2;
|
|
}
|
|
|
|
*rule_nr = 90;
|
|
self = mdev->ldev->md.uuid[UI_BITMAP] & ~((u64)1);
|
|
peer = mdev->p_uuid[UI_BITMAP] & ~((u64)1);
|
|
if (self == peer && self != ((u64)0))
|
|
return 100;
|
|
|
|
*rule_nr = 100;
|
|
for (i = UI_HISTORY_START; i <= UI_HISTORY_END; i++) {
|
|
self = mdev->ldev->md.uuid[i] & ~((u64)1);
|
|
for (j = UI_HISTORY_START; j <= UI_HISTORY_END; j++) {
|
|
peer = mdev->p_uuid[j] & ~((u64)1);
|
|
if (self == peer)
|
|
return -100;
|
|
}
|
|
}
|
|
|
|
return -1000;
|
|
}
|
|
|
|
/* drbd_sync_handshake() returns the new conn state on success, or
|
|
CONN_MASK (-1) on failure.
|
|
*/
|
|
static enum drbd_conns drbd_sync_handshake(struct drbd_conf *mdev, enum drbd_role peer_role,
|
|
enum drbd_disk_state peer_disk) __must_hold(local)
|
|
{
|
|
int hg, rule_nr;
|
|
enum drbd_conns rv = C_MASK;
|
|
enum drbd_disk_state mydisk;
|
|
|
|
mydisk = mdev->state.disk;
|
|
if (mydisk == D_NEGOTIATING)
|
|
mydisk = mdev->new_state_tmp.disk;
|
|
|
|
dev_info(DEV, "drbd_sync_handshake:\n");
|
|
drbd_uuid_dump(mdev, "self", mdev->ldev->md.uuid, mdev->comm_bm_set, 0);
|
|
drbd_uuid_dump(mdev, "peer", mdev->p_uuid,
|
|
mdev->p_uuid[UI_SIZE], mdev->p_uuid[UI_FLAGS]);
|
|
|
|
hg = drbd_uuid_compare(mdev, &rule_nr);
|
|
|
|
dev_info(DEV, "uuid_compare()=%d by rule %d\n", hg, rule_nr);
|
|
|
|
if (hg == -1000) {
|
|
dev_alert(DEV, "Unrelated data, aborting!\n");
|
|
return C_MASK;
|
|
}
|
|
if (hg == -1001) {
|
|
dev_alert(DEV, "To resolve this both sides have to support at least protocol\n");
|
|
return C_MASK;
|
|
}
|
|
|
|
if ((mydisk == D_INCONSISTENT && peer_disk > D_INCONSISTENT) ||
|
|
(peer_disk == D_INCONSISTENT && mydisk > D_INCONSISTENT)) {
|
|
int f = (hg == -100) || abs(hg) == 2;
|
|
hg = mydisk > D_INCONSISTENT ? 1 : -1;
|
|
if (f)
|
|
hg = hg*2;
|
|
dev_info(DEV, "Becoming sync %s due to disk states.\n",
|
|
hg > 0 ? "source" : "target");
|
|
}
|
|
|
|
if (abs(hg) == 100)
|
|
drbd_khelper(mdev, "initial-split-brain");
|
|
|
|
if (hg == 100 || (hg == -100 && mdev->net_conf->always_asbp)) {
|
|
int pcount = (mdev->state.role == R_PRIMARY)
|
|
+ (peer_role == R_PRIMARY);
|
|
int forced = (hg == -100);
|
|
|
|
switch (pcount) {
|
|
case 0:
|
|
hg = drbd_asb_recover_0p(mdev);
|
|
break;
|
|
case 1:
|
|
hg = drbd_asb_recover_1p(mdev);
|
|
break;
|
|
case 2:
|
|
hg = drbd_asb_recover_2p(mdev);
|
|
break;
|
|
}
|
|
if (abs(hg) < 100) {
|
|
dev_warn(DEV, "Split-Brain detected, %d primaries, "
|
|
"automatically solved. Sync from %s node\n",
|
|
pcount, (hg < 0) ? "peer" : "this");
|
|
if (forced) {
|
|
dev_warn(DEV, "Doing a full sync, since"
|
|
" UUIDs where ambiguous.\n");
|
|
hg = hg*2;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (hg == -100) {
|
|
if (mdev->net_conf->want_lose && !(mdev->p_uuid[UI_FLAGS]&1))
|
|
hg = -1;
|
|
if (!mdev->net_conf->want_lose && (mdev->p_uuid[UI_FLAGS]&1))
|
|
hg = 1;
|
|
|
|
if (abs(hg) < 100)
|
|
dev_warn(DEV, "Split-Brain detected, manually solved. "
|
|
"Sync from %s node\n",
|
|
(hg < 0) ? "peer" : "this");
|
|
}
|
|
|
|
if (hg == -100) {
|
|
/* FIXME this log message is not correct if we end up here
|
|
* after an attempted attach on a diskless node.
|
|
* We just refuse to attach -- well, we drop the "connection"
|
|
* to that disk, in a way... */
|
|
dev_alert(DEV, "Split-Brain detected but unresolved, dropping connection!\n");
|
|
drbd_khelper(mdev, "split-brain");
|
|
return C_MASK;
|
|
}
|
|
|
|
if (hg > 0 && mydisk <= D_INCONSISTENT) {
|
|
dev_err(DEV, "I shall become SyncSource, but I am inconsistent!\n");
|
|
return C_MASK;
|
|
}
|
|
|
|
if (hg < 0 && /* by intention we do not use mydisk here. */
|
|
mdev->state.role == R_PRIMARY && mdev->state.disk >= D_CONSISTENT) {
|
|
switch (mdev->net_conf->rr_conflict) {
|
|
case ASB_CALL_HELPER:
|
|
drbd_khelper(mdev, "pri-lost");
|
|
/* fall through */
|
|
case ASB_DISCONNECT:
|
|
dev_err(DEV, "I shall become SyncTarget, but I am primary!\n");
|
|
return C_MASK;
|
|
case ASB_VIOLENTLY:
|
|
dev_warn(DEV, "Becoming SyncTarget, violating the stable-data"
|
|
"assumption\n");
|
|
}
|
|
}
|
|
|
|
if (mdev->net_conf->dry_run || test_bit(CONN_DRY_RUN, &mdev->flags)) {
|
|
if (hg == 0)
|
|
dev_info(DEV, "dry-run connect: No resync, would become Connected immediately.\n");
|
|
else
|
|
dev_info(DEV, "dry-run connect: Would become %s, doing a %s resync.",
|
|
drbd_conn_str(hg > 0 ? C_SYNC_SOURCE : C_SYNC_TARGET),
|
|
abs(hg) >= 2 ? "full" : "bit-map based");
|
|
return C_MASK;
|
|
}
|
|
|
|
if (abs(hg) >= 2) {
|
|
dev_info(DEV, "Writing the whole bitmap, full sync required after drbd_sync_handshake.\n");
|
|
if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from sync_handshake"))
|
|
return C_MASK;
|
|
}
|
|
|
|
if (hg > 0) { /* become sync source. */
|
|
rv = C_WF_BITMAP_S;
|
|
} else if (hg < 0) { /* become sync target */
|
|
rv = C_WF_BITMAP_T;
|
|
} else {
|
|
rv = C_CONNECTED;
|
|
if (drbd_bm_total_weight(mdev)) {
|
|
dev_info(DEV, "No resync, but %lu bits in bitmap!\n",
|
|
drbd_bm_total_weight(mdev));
|
|
}
|
|
}
|
|
|
|
return rv;
|
|
}
|
|
|
|
/* returns 1 if invalid */
|
|
static int cmp_after_sb(enum drbd_after_sb_p peer, enum drbd_after_sb_p self)
|
|
{
|
|
/* ASB_DISCARD_REMOTE - ASB_DISCARD_LOCAL is valid */
|
|
if ((peer == ASB_DISCARD_REMOTE && self == ASB_DISCARD_LOCAL) ||
|
|
(self == ASB_DISCARD_REMOTE && peer == ASB_DISCARD_LOCAL))
|
|
return 0;
|
|
|
|
/* any other things with ASB_DISCARD_REMOTE or ASB_DISCARD_LOCAL are invalid */
|
|
if (peer == ASB_DISCARD_REMOTE || peer == ASB_DISCARD_LOCAL ||
|
|
self == ASB_DISCARD_REMOTE || self == ASB_DISCARD_LOCAL)
|
|
return 1;
|
|
|
|
/* everything else is valid if they are equal on both sides. */
|
|
if (peer == self)
|
|
return 0;
|
|
|
|
/* everything es is invalid. */
|
|
return 1;
|
|
}
|
|
|
|
static int receive_protocol(struct drbd_conf *mdev, struct p_header *h)
|
|
{
|
|
struct p_protocol *p = (struct p_protocol *)h;
|
|
int header_size, data_size;
|
|
int p_proto, p_after_sb_0p, p_after_sb_1p, p_after_sb_2p;
|
|
int p_want_lose, p_two_primaries, cf;
|
|
char p_integrity_alg[SHARED_SECRET_MAX] = "";
|
|
|
|
header_size = sizeof(*p) - sizeof(*h);
|
|
data_size = h->length - header_size;
|
|
|
|
if (drbd_recv(mdev, h->payload, header_size) != header_size)
|
|
return FALSE;
|
|
|
|
p_proto = be32_to_cpu(p->protocol);
|
|
p_after_sb_0p = be32_to_cpu(p->after_sb_0p);
|
|
p_after_sb_1p = be32_to_cpu(p->after_sb_1p);
|
|
p_after_sb_2p = be32_to_cpu(p->after_sb_2p);
|
|
p_two_primaries = be32_to_cpu(p->two_primaries);
|
|
cf = be32_to_cpu(p->conn_flags);
|
|
p_want_lose = cf & CF_WANT_LOSE;
|
|
|
|
clear_bit(CONN_DRY_RUN, &mdev->flags);
|
|
|
|
if (cf & CF_DRY_RUN)
|
|
set_bit(CONN_DRY_RUN, &mdev->flags);
|
|
|
|
if (p_proto != mdev->net_conf->wire_protocol) {
|
|
dev_err(DEV, "incompatible communication protocols\n");
|
|
goto disconnect;
|
|
}
|
|
|
|
if (cmp_after_sb(p_after_sb_0p, mdev->net_conf->after_sb_0p)) {
|
|
dev_err(DEV, "incompatible after-sb-0pri settings\n");
|
|
goto disconnect;
|
|
}
|
|
|
|
if (cmp_after_sb(p_after_sb_1p, mdev->net_conf->after_sb_1p)) {
|
|
dev_err(DEV, "incompatible after-sb-1pri settings\n");
|
|
goto disconnect;
|
|
}
|
|
|
|
if (cmp_after_sb(p_after_sb_2p, mdev->net_conf->after_sb_2p)) {
|
|
dev_err(DEV, "incompatible after-sb-2pri settings\n");
|
|
goto disconnect;
|
|
}
|
|
|
|
if (p_want_lose && mdev->net_conf->want_lose) {
|
|
dev_err(DEV, "both sides have the 'want_lose' flag set\n");
|
|
goto disconnect;
|
|
}
|
|
|
|
if (p_two_primaries != mdev->net_conf->two_primaries) {
|
|
dev_err(DEV, "incompatible setting of the two-primaries options\n");
|
|
goto disconnect;
|
|
}
|
|
|
|
if (mdev->agreed_pro_version >= 87) {
|
|
unsigned char *my_alg = mdev->net_conf->integrity_alg;
|
|
|
|
if (drbd_recv(mdev, p_integrity_alg, data_size) != data_size)
|
|
return FALSE;
|
|
|
|
p_integrity_alg[SHARED_SECRET_MAX-1] = 0;
|
|
if (strcmp(p_integrity_alg, my_alg)) {
|
|
dev_err(DEV, "incompatible setting of the data-integrity-alg\n");
|
|
goto disconnect;
|
|
}
|
|
dev_info(DEV, "data-integrity-alg: %s\n",
|
|
my_alg[0] ? my_alg : (unsigned char *)"<not-used>");
|
|
}
|
|
|
|
return TRUE;
|
|
|
|
disconnect:
|
|
drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
|
|
return FALSE;
|
|
}
|
|
|
|
/* helper function
|
|
* input: alg name, feature name
|
|
* return: NULL (alg name was "")
|
|
* ERR_PTR(error) if something goes wrong
|
|
* or the crypto hash ptr, if it worked out ok. */
|
|
struct crypto_hash *drbd_crypto_alloc_digest_safe(const struct drbd_conf *mdev,
|
|
const char *alg, const char *name)
|
|
{
|
|
struct crypto_hash *tfm;
|
|
|
|
if (!alg[0])
|
|
return NULL;
|
|
|
|
tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC);
|
|
if (IS_ERR(tfm)) {
|
|
dev_err(DEV, "Can not allocate \"%s\" as %s (reason: %ld)\n",
|
|
alg, name, PTR_ERR(tfm));
|
|
return tfm;
|
|
}
|
|
if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) {
|
|
crypto_free_hash(tfm);
|
|
dev_err(DEV, "\"%s\" is not a digest (%s)\n", alg, name);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
return tfm;
|
|
}
|
|
|
|
static int receive_SyncParam(struct drbd_conf *mdev, struct p_header *h)
|
|
{
|
|
int ok = TRUE;
|
|
struct p_rs_param_89 *p = (struct p_rs_param_89 *)h;
|
|
unsigned int header_size, data_size, exp_max_sz;
|
|
struct crypto_hash *verify_tfm = NULL;
|
|
struct crypto_hash *csums_tfm = NULL;
|
|
const int apv = mdev->agreed_pro_version;
|
|
|
|
exp_max_sz = apv <= 87 ? sizeof(struct p_rs_param)
|
|
: apv == 88 ? sizeof(struct p_rs_param)
|
|
+ SHARED_SECRET_MAX
|
|
: /* 89 */ sizeof(struct p_rs_param_89);
|
|
|
|
if (h->length > exp_max_sz) {
|
|
dev_err(DEV, "SyncParam packet too long: received %u, expected <= %u bytes\n",
|
|
h->length, exp_max_sz);
|
|
return FALSE;
|
|
}
|
|
|
|
if (apv <= 88) {
|
|
header_size = sizeof(struct p_rs_param) - sizeof(*h);
|
|
data_size = h->length - header_size;
|
|
} else /* apv >= 89 */ {
|
|
header_size = sizeof(struct p_rs_param_89) - sizeof(*h);
|
|
data_size = h->length - header_size;
|
|
D_ASSERT(data_size == 0);
|
|
}
|
|
|
|
/* initialize verify_alg and csums_alg */
|
|
memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX);
|
|
|
|
if (drbd_recv(mdev, h->payload, header_size) != header_size)
|
|
return FALSE;
|
|
|
|
mdev->sync_conf.rate = be32_to_cpu(p->rate);
|
|
|
|
if (apv >= 88) {
|
|
if (apv == 88) {
|
|
if (data_size > SHARED_SECRET_MAX) {
|
|
dev_err(DEV, "verify-alg too long, "
|
|
"peer wants %u, accepting only %u byte\n",
|
|
data_size, SHARED_SECRET_MAX);
|
|
return FALSE;
|
|
}
|
|
|
|
if (drbd_recv(mdev, p->verify_alg, data_size) != data_size)
|
|
return FALSE;
|
|
|
|
/* we expect NUL terminated string */
|
|
/* but just in case someone tries to be evil */
|
|
D_ASSERT(p->verify_alg[data_size-1] == 0);
|
|
p->verify_alg[data_size-1] = 0;
|
|
|
|
} else /* apv >= 89 */ {
|
|
/* we still expect NUL terminated strings */
|
|
/* but just in case someone tries to be evil */
|
|
D_ASSERT(p->verify_alg[SHARED_SECRET_MAX-1] == 0);
|
|
D_ASSERT(p->csums_alg[SHARED_SECRET_MAX-1] == 0);
|
|
p->verify_alg[SHARED_SECRET_MAX-1] = 0;
|
|
p->csums_alg[SHARED_SECRET_MAX-1] = 0;
|
|
}
|
|
|
|
if (strcmp(mdev->sync_conf.verify_alg, p->verify_alg)) {
|
|
if (mdev->state.conn == C_WF_REPORT_PARAMS) {
|
|
dev_err(DEV, "Different verify-alg settings. me=\"%s\" peer=\"%s\"\n",
|
|
mdev->sync_conf.verify_alg, p->verify_alg);
|
|
goto disconnect;
|
|
}
|
|
verify_tfm = drbd_crypto_alloc_digest_safe(mdev,
|
|
p->verify_alg, "verify-alg");
|
|
if (IS_ERR(verify_tfm)) {
|
|
verify_tfm = NULL;
|
|
goto disconnect;
|
|
}
|
|
}
|
|
|
|
if (apv >= 89 && strcmp(mdev->sync_conf.csums_alg, p->csums_alg)) {
|
|
if (mdev->state.conn == C_WF_REPORT_PARAMS) {
|
|
dev_err(DEV, "Different csums-alg settings. me=\"%s\" peer=\"%s\"\n",
|
|
mdev->sync_conf.csums_alg, p->csums_alg);
|
|
goto disconnect;
|
|
}
|
|
csums_tfm = drbd_crypto_alloc_digest_safe(mdev,
|
|
p->csums_alg, "csums-alg");
|
|
if (IS_ERR(csums_tfm)) {
|
|
csums_tfm = NULL;
|
|
goto disconnect;
|
|
}
|
|
}
|
|
|
|
|
|
spin_lock(&mdev->peer_seq_lock);
|
|
/* lock against drbd_nl_syncer_conf() */
|
|
if (verify_tfm) {
|
|
strcpy(mdev->sync_conf.verify_alg, p->verify_alg);
|
|
mdev->sync_conf.verify_alg_len = strlen(p->verify_alg) + 1;
|
|
crypto_free_hash(mdev->verify_tfm);
|
|
mdev->verify_tfm = verify_tfm;
|
|
dev_info(DEV, "using verify-alg: \"%s\"\n", p->verify_alg);
|
|
}
|
|
if (csums_tfm) {
|
|
strcpy(mdev->sync_conf.csums_alg, p->csums_alg);
|
|
mdev->sync_conf.csums_alg_len = strlen(p->csums_alg) + 1;
|
|
crypto_free_hash(mdev->csums_tfm);
|
|
mdev->csums_tfm = csums_tfm;
|
|
dev_info(DEV, "using csums-alg: \"%s\"\n", p->csums_alg);
|
|
}
|
|
spin_unlock(&mdev->peer_seq_lock);
|
|
}
|
|
|
|
return ok;
|
|
disconnect:
|
|
/* just for completeness: actually not needed,
|
|
* as this is not reached if csums_tfm was ok. */
|
|
crypto_free_hash(csums_tfm);
|
|
/* but free the verify_tfm again, if csums_tfm did not work out */
|
|
crypto_free_hash(verify_tfm);
|
|
drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
|
|
return FALSE;
|
|
}
|
|
|
|
static void drbd_setup_order_type(struct drbd_conf *mdev, int peer)
|
|
{
|
|
/* sorry, we currently have no working implementation
|
|
* of distributed TCQ */
|
|
}
|
|
|
|
/* warn if the arguments differ by more than 12.5% */
|
|
static void warn_if_differ_considerably(struct drbd_conf *mdev,
|
|
const char *s, sector_t a, sector_t b)
|
|
{
|
|
sector_t d;
|
|
if (a == 0 || b == 0)
|
|
return;
|
|
d = (a > b) ? (a - b) : (b - a);
|
|
if (d > (a>>3) || d > (b>>3))
|
|
dev_warn(DEV, "Considerable difference in %s: %llus vs. %llus\n", s,
|
|
(unsigned long long)a, (unsigned long long)b);
|
|
}
|
|
|
|
static int receive_sizes(struct drbd_conf *mdev, struct p_header *h)
|
|
{
|
|
struct p_sizes *p = (struct p_sizes *)h;
|
|
enum determine_dev_size dd = unchanged;
|
|
unsigned int max_seg_s;
|
|
sector_t p_size, p_usize, my_usize;
|
|
int ldsc = 0; /* local disk size changed */
|
|
enum dds_flags ddsf;
|
|
|
|
ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) return FALSE;
|
|
if (drbd_recv(mdev, h->payload, h->length) != h->length)
|
|
return FALSE;
|
|
|
|
p_size = be64_to_cpu(p->d_size);
|
|
p_usize = be64_to_cpu(p->u_size);
|
|
|
|
if (p_size == 0 && mdev->state.disk == D_DISKLESS) {
|
|
dev_err(DEV, "some backing storage is needed\n");
|
|
drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
|
|
return FALSE;
|
|
}
|
|
|
|
/* just store the peer's disk size for now.
|
|
* we still need to figure out whether we accept that. */
|
|
mdev->p_size = p_size;
|
|
|
|
#define min_not_zero(l, r) (l == 0) ? r : ((r == 0) ? l : min(l, r))
|
|
if (get_ldev(mdev)) {
|
|
warn_if_differ_considerably(mdev, "lower level device sizes",
|
|
p_size, drbd_get_max_capacity(mdev->ldev));
|
|
warn_if_differ_considerably(mdev, "user requested size",
|
|
p_usize, mdev->ldev->dc.disk_size);
|
|
|
|
/* if this is the first connect, or an otherwise expected
|
|
* param exchange, choose the minimum */
|
|
if (mdev->state.conn == C_WF_REPORT_PARAMS)
|
|
p_usize = min_not_zero((sector_t)mdev->ldev->dc.disk_size,
|
|
p_usize);
|
|
|
|
my_usize = mdev->ldev->dc.disk_size;
|
|
|
|
if (mdev->ldev->dc.disk_size != p_usize) {
|
|
mdev->ldev->dc.disk_size = p_usize;
|
|
dev_info(DEV, "Peer sets u_size to %lu sectors\n",
|
|
(unsigned long)mdev->ldev->dc.disk_size);
|
|
}
|
|
|
|
/* Never shrink a device with usable data during connect.
|
|
But allow online shrinking if we are connected. */
|
|
if (drbd_new_dev_size(mdev, mdev->ldev, 0) <
|
|
drbd_get_capacity(mdev->this_bdev) &&
|
|
mdev->state.disk >= D_OUTDATED &&
|
|
mdev->state.conn < C_CONNECTED) {
|
|
dev_err(DEV, "The peer's disk size is too small!\n");
|
|
drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
|
|
mdev->ldev->dc.disk_size = my_usize;
|
|
put_ldev(mdev);
|
|
return FALSE;
|
|
}
|
|
put_ldev(mdev);
|
|
}
|
|
#undef min_not_zero
|
|
|
|
ddsf = be16_to_cpu(p->dds_flags);
|
|
if (get_ldev(mdev)) {
|
|
dd = drbd_determin_dev_size(mdev, ddsf);
|
|
put_ldev(mdev);
|
|
if (dd == dev_size_error)
|
|
return FALSE;
|
|
drbd_md_sync(mdev);
|
|
} else {
|
|
/* I am diskless, need to accept the peer's size. */
|
|
drbd_set_my_capacity(mdev, p_size);
|
|
}
|
|
|
|
if (get_ldev(mdev)) {
|
|
if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) {
|
|
mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev);
|
|
ldsc = 1;
|
|
}
|
|
|
|
if (mdev->agreed_pro_version < 94)
|
|
max_seg_s = be32_to_cpu(p->max_segment_size);
|
|
else /* drbd 8.3.8 onwards */
|
|
max_seg_s = DRBD_MAX_SEGMENT_SIZE;
|
|
|
|
if (max_seg_s != queue_max_segment_size(mdev->rq_queue))
|
|
drbd_setup_queue_param(mdev, max_seg_s);
|
|
|
|
drbd_setup_order_type(mdev, be16_to_cpu(p->queue_order_type));
|
|
put_ldev(mdev);
|
|
}
|
|
|
|
if (mdev->state.conn > C_WF_REPORT_PARAMS) {
|
|
if (be64_to_cpu(p->c_size) !=
|
|
drbd_get_capacity(mdev->this_bdev) || ldsc) {
|
|
/* we have different sizes, probably peer
|
|
* needs to know my new size... */
|
|
drbd_send_sizes(mdev, 0, ddsf);
|
|
}
|
|
if (test_and_clear_bit(RESIZE_PENDING, &mdev->flags) ||
|
|
(dd == grew && mdev->state.conn == C_CONNECTED)) {
|
|
if (mdev->state.pdsk >= D_INCONSISTENT &&
|
|
mdev->state.disk >= D_INCONSISTENT) {
|
|
if (ddsf & DDSF_NO_RESYNC)
|
|
dev_info(DEV, "Resync of new storage suppressed with --assume-clean\n");
|
|
else
|
|
resync_after_online_grow(mdev);
|
|
} else
|
|
set_bit(RESYNC_AFTER_NEG, &mdev->flags);
|
|
}
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static int receive_uuids(struct drbd_conf *mdev, struct p_header *h)
|
|
{
|
|
struct p_uuids *p = (struct p_uuids *)h;
|
|
u64 *p_uuid;
|
|
int i;
|
|
|
|
ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) return FALSE;
|
|
if (drbd_recv(mdev, h->payload, h->length) != h->length)
|
|
return FALSE;
|
|
|
|
p_uuid = kmalloc(sizeof(u64)*UI_EXTENDED_SIZE, GFP_NOIO);
|
|
|
|
for (i = UI_CURRENT; i < UI_EXTENDED_SIZE; i++)
|
|
p_uuid[i] = be64_to_cpu(p->uuid[i]);
|
|
|
|
kfree(mdev->p_uuid);
|
|
mdev->p_uuid = p_uuid;
|
|
|
|
if (mdev->state.conn < C_CONNECTED &&
|
|
mdev->state.disk < D_INCONSISTENT &&
|
|
mdev->state.role == R_PRIMARY &&
|
|
(mdev->ed_uuid & ~((u64)1)) != (p_uuid[UI_CURRENT] & ~((u64)1))) {
|
|
dev_err(DEV, "Can only connect to data with current UUID=%016llX\n",
|
|
(unsigned long long)mdev->ed_uuid);
|
|
drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
|
|
return FALSE;
|
|
}
|
|
|
|
if (get_ldev(mdev)) {
|
|
int skip_initial_sync =
|
|
mdev->state.conn == C_CONNECTED &&
|
|
mdev->agreed_pro_version >= 90 &&
|
|
mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED &&
|
|
(p_uuid[UI_FLAGS] & 8);
|
|
if (skip_initial_sync) {
|
|
dev_info(DEV, "Accepted new current UUID, preparing to skip initial sync\n");
|
|
drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write,
|
|
"clear_n_write from receive_uuids");
|
|
_drbd_uuid_set(mdev, UI_CURRENT, p_uuid[UI_CURRENT]);
|
|
_drbd_uuid_set(mdev, UI_BITMAP, 0);
|
|
_drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE),
|
|
CS_VERBOSE, NULL);
|
|
drbd_md_sync(mdev);
|
|
}
|
|
put_ldev(mdev);
|
|
} else if (mdev->state.disk < D_INCONSISTENT &&
|
|
mdev->state.role == R_PRIMARY) {
|
|
/* I am a diskless primary, the peer just created a new current UUID
|
|
for me. */
|
|
drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]);
|
|
}
|
|
|
|
/* Before we test for the disk state, we should wait until an eventually
|
|
ongoing cluster wide state change is finished. That is important if
|
|
we are primary and are detaching from our disk. We need to see the
|
|
new disk state... */
|
|
wait_event(mdev->misc_wait, !test_bit(CLUSTER_ST_CHANGE, &mdev->flags));
|
|
if (mdev->state.conn >= C_CONNECTED && mdev->state.disk < D_INCONSISTENT)
|
|
drbd_set_ed_uuid(mdev, p_uuid[UI_CURRENT]);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* convert_state() - Converts the peer's view of the cluster state to our point of view
|
|
* @ps: The state as seen by the peer.
|
|
*/
|
|
static union drbd_state convert_state(union drbd_state ps)
|
|
{
|
|
union drbd_state ms;
|
|
|
|
static enum drbd_conns c_tab[] = {
|
|
[C_CONNECTED] = C_CONNECTED,
|
|
|
|
[C_STARTING_SYNC_S] = C_STARTING_SYNC_T,
|
|
[C_STARTING_SYNC_T] = C_STARTING_SYNC_S,
|
|
[C_DISCONNECTING] = C_TEAR_DOWN, /* C_NETWORK_FAILURE, */
|
|
[C_VERIFY_S] = C_VERIFY_T,
|
|
[C_MASK] = C_MASK,
|
|
};
|
|
|
|
ms.i = ps.i;
|
|
|
|
ms.conn = c_tab[ps.conn];
|
|
ms.peer = ps.role;
|
|
ms.role = ps.peer;
|
|
ms.pdsk = ps.disk;
|
|
ms.disk = ps.pdsk;
|
|
ms.peer_isp = (ps.aftr_isp | ps.user_isp);
|
|
|
|
return ms;
|
|
}
|
|
|
|
static int receive_req_state(struct drbd_conf *mdev, struct p_header *h)
|
|
{
|
|
struct p_req_state *p = (struct p_req_state *)h;
|
|
union drbd_state mask, val;
|
|
int rv;
|
|
|
|
ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) return FALSE;
|
|
if (drbd_recv(mdev, h->payload, h->length) != h->length)
|
|
return FALSE;
|
|
|
|
mask.i = be32_to_cpu(p->mask);
|
|
val.i = be32_to_cpu(p->val);
|
|
|
|
if (test_bit(DISCARD_CONCURRENT, &mdev->flags) &&
|
|
test_bit(CLUSTER_ST_CHANGE, &mdev->flags)) {
|
|
drbd_send_sr_reply(mdev, SS_CONCURRENT_ST_CHG);
|
|
return TRUE;
|
|
}
|
|
|
|
mask = convert_state(mask);
|
|
val = convert_state(val);
|
|
|
|
rv = drbd_change_state(mdev, CS_VERBOSE, mask, val);
|
|
|
|
drbd_send_sr_reply(mdev, rv);
|
|
drbd_md_sync(mdev);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static int receive_state(struct drbd_conf *mdev, struct p_header *h)
|
|
{
|
|
struct p_state *p = (struct p_state *)h;
|
|
enum drbd_conns nconn, oconn;
|
|
union drbd_state ns, peer_state;
|
|
enum drbd_disk_state real_peer_disk;
|
|
enum chg_state_flags cs_flags;
|
|
int rv;
|
|
|
|
ERR_IF(h->length != (sizeof(*p)-sizeof(*h)))
|
|
return FALSE;
|
|
|
|
if (drbd_recv(mdev, h->payload, h->length) != h->length)
|
|
return FALSE;
|
|
|
|
peer_state.i = be32_to_cpu(p->state);
|
|
|
|
real_peer_disk = peer_state.disk;
|
|
if (peer_state.disk == D_NEGOTIATING) {
|
|
real_peer_disk = mdev->p_uuid[UI_FLAGS] & 4 ? D_INCONSISTENT : D_CONSISTENT;
|
|
dev_info(DEV, "real peer disk state = %s\n", drbd_disk_str(real_peer_disk));
|
|
}
|
|
|
|
spin_lock_irq(&mdev->req_lock);
|
|
retry:
|
|
oconn = nconn = mdev->state.conn;
|
|
spin_unlock_irq(&mdev->req_lock);
|
|
|
|
if (nconn == C_WF_REPORT_PARAMS)
|
|
nconn = C_CONNECTED;
|
|
|
|
if (mdev->p_uuid && peer_state.disk >= D_NEGOTIATING &&
|
|
get_ldev_if_state(mdev, D_NEGOTIATING)) {
|
|
int cr; /* consider resync */
|
|
|
|
/* if we established a new connection */
|
|
cr = (oconn < C_CONNECTED);
|
|
/* if we had an established connection
|
|
* and one of the nodes newly attaches a disk */
|
|
cr |= (oconn == C_CONNECTED &&
|
|
(peer_state.disk == D_NEGOTIATING ||
|
|
mdev->state.disk == D_NEGOTIATING));
|
|
/* if we have both been inconsistent, and the peer has been
|
|
* forced to be UpToDate with --overwrite-data */
|
|
cr |= test_bit(CONSIDER_RESYNC, &mdev->flags);
|
|
/* if we had been plain connected, and the admin requested to
|
|
* start a sync by "invalidate" or "invalidate-remote" */
|
|
cr |= (oconn == C_CONNECTED &&
|
|
(peer_state.conn >= C_STARTING_SYNC_S &&
|
|
peer_state.conn <= C_WF_BITMAP_T));
|
|
|
|
if (cr)
|
|
nconn = drbd_sync_handshake(mdev, peer_state.role, real_peer_disk);
|
|
|
|
put_ldev(mdev);
|
|
if (nconn == C_MASK) {
|
|
nconn = C_CONNECTED;
|
|
if (mdev->state.disk == D_NEGOTIATING) {
|
|
drbd_force_state(mdev, NS(disk, D_DISKLESS));
|
|
} else if (peer_state.disk == D_NEGOTIATING) {
|
|
dev_err(DEV, "Disk attach process on the peer node was aborted.\n");
|
|
peer_state.disk = D_DISKLESS;
|
|
real_peer_disk = D_DISKLESS;
|
|
} else {
|
|
if (test_and_clear_bit(CONN_DRY_RUN, &mdev->flags))
|
|
return FALSE;
|
|
D_ASSERT(oconn == C_WF_REPORT_PARAMS);
|
|
drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
|
|
return FALSE;
|
|
}
|
|
}
|
|
}
|
|
|
|
spin_lock_irq(&mdev->req_lock);
|
|
if (mdev->state.conn != oconn)
|
|
goto retry;
|
|
clear_bit(CONSIDER_RESYNC, &mdev->flags);
|
|
ns.i = mdev->state.i;
|
|
ns.conn = nconn;
|
|
ns.peer = peer_state.role;
|
|
ns.pdsk = real_peer_disk;
|
|
ns.peer_isp = (peer_state.aftr_isp | peer_state.user_isp);
|
|
if ((nconn == C_CONNECTED || nconn == C_WF_BITMAP_S) && ns.disk == D_NEGOTIATING)
|
|
ns.disk = mdev->new_state_tmp.disk;
|
|
cs_flags = CS_VERBOSE + (oconn < C_CONNECTED && nconn >= C_CONNECTED ? 0 : CS_HARD);
|
|
if (ns.pdsk == D_CONSISTENT && ns.susp && nconn == C_CONNECTED && oconn < C_CONNECTED &&
|
|
test_bit(NEW_CUR_UUID, &mdev->flags)) {
|
|
/* Do not allow tl_restart(resend) for a rebooted peer. We can only allow this
|
|
for temporal network outages! */
|
|
spin_unlock_irq(&mdev->req_lock);
|
|
dev_err(DEV, "Aborting Connect, can not thaw IO with an only Consistent peer\n");
|
|
tl_clear(mdev);
|
|
drbd_uuid_new_current(mdev);
|
|
clear_bit(NEW_CUR_UUID, &mdev->flags);
|
|
drbd_force_state(mdev, NS2(conn, C_PROTOCOL_ERROR, susp, 0));
|
|
return FALSE;
|
|
}
|
|
rv = _drbd_set_state(mdev, ns, cs_flags, NULL);
|
|
ns = mdev->state;
|
|
spin_unlock_irq(&mdev->req_lock);
|
|
|
|
if (rv < SS_SUCCESS) {
|
|
drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
|
|
return FALSE;
|
|
}
|
|
|
|
if (oconn > C_WF_REPORT_PARAMS) {
|
|
if (nconn > C_CONNECTED && peer_state.conn <= C_CONNECTED &&
|
|
peer_state.disk != D_NEGOTIATING ) {
|
|
/* we want resync, peer has not yet decided to sync... */
|
|
/* Nowadays only used when forcing a node into primary role and
|
|
setting its disk to UpToDate with that */
|
|
drbd_send_uuids(mdev);
|
|
drbd_send_state(mdev);
|
|
}
|
|
}
|
|
|
|
mdev->net_conf->want_lose = 0;
|
|
|
|
drbd_md_sync(mdev); /* update connected indicator, la_size, ... */
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static int receive_sync_uuid(struct drbd_conf *mdev, struct p_header *h)
|
|
{
|
|
struct p_rs_uuid *p = (struct p_rs_uuid *)h;
|
|
|
|
wait_event(mdev->misc_wait,
|
|
mdev->state.conn == C_WF_SYNC_UUID ||
|
|
mdev->state.conn < C_CONNECTED ||
|
|
mdev->state.disk < D_NEGOTIATING);
|
|
|
|
/* D_ASSERT( mdev->state.conn == C_WF_SYNC_UUID ); */
|
|
|
|
ERR_IF(h->length != (sizeof(*p)-sizeof(*h))) return FALSE;
|
|
if (drbd_recv(mdev, h->payload, h->length) != h->length)
|
|
return FALSE;
|
|
|
|
/* Here the _drbd_uuid_ functions are right, current should
|
|
_not_ be rotated into the history */
|
|
if (get_ldev_if_state(mdev, D_NEGOTIATING)) {
|
|
_drbd_uuid_set(mdev, UI_CURRENT, be64_to_cpu(p->uuid));
|
|
_drbd_uuid_set(mdev, UI_BITMAP, 0UL);
|
|
|
|
drbd_start_resync(mdev, C_SYNC_TARGET);
|
|
|
|
put_ldev(mdev);
|
|
} else
|
|
dev_err(DEV, "Ignoring SyncUUID packet!\n");
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
enum receive_bitmap_ret { OK, DONE, FAILED };
|
|
|
|
static enum receive_bitmap_ret
|
|
receive_bitmap_plain(struct drbd_conf *mdev, struct p_header *h,
|
|
unsigned long *buffer, struct bm_xfer_ctx *c)
|
|
{
|
|
unsigned num_words = min_t(size_t, BM_PACKET_WORDS, c->bm_words - c->word_offset);
|
|
unsigned want = num_words * sizeof(long);
|
|
|
|
if (want != h->length) {
|
|
dev_err(DEV, "%s:want (%u) != h->length (%u)\n", __func__, want, h->length);
|
|
return FAILED;
|
|
}
|
|
if (want == 0)
|
|
return DONE;
|
|
if (drbd_recv(mdev, buffer, want) != want)
|
|
return FAILED;
|
|
|
|
drbd_bm_merge_lel(mdev, c->word_offset, num_words, buffer);
|
|
|
|
c->word_offset += num_words;
|
|
c->bit_offset = c->word_offset * BITS_PER_LONG;
|
|
if (c->bit_offset > c->bm_bits)
|
|
c->bit_offset = c->bm_bits;
|
|
|
|
return OK;
|
|
}
|
|
|
|
static enum receive_bitmap_ret
|
|
recv_bm_rle_bits(struct drbd_conf *mdev,
|
|
struct p_compressed_bm *p,
|
|
struct bm_xfer_ctx *c)
|
|
{
|
|
struct bitstream bs;
|
|
u64 look_ahead;
|
|
u64 rl;
|
|
u64 tmp;
|
|
unsigned long s = c->bit_offset;
|
|
unsigned long e;
|
|
int len = p->head.length - (sizeof(*p) - sizeof(p->head));
|
|
int toggle = DCBP_get_start(p);
|
|
int have;
|
|
int bits;
|
|
|
|
bitstream_init(&bs, p->code, len, DCBP_get_pad_bits(p));
|
|
|
|
bits = bitstream_get_bits(&bs, &look_ahead, 64);
|
|
if (bits < 0)
|
|
return FAILED;
|
|
|
|
for (have = bits; have > 0; s += rl, toggle = !toggle) {
|
|
bits = vli_decode_bits(&rl, look_ahead);
|
|
if (bits <= 0)
|
|
return FAILED;
|
|
|
|
if (toggle) {
|
|
e = s + rl -1;
|
|
if (e >= c->bm_bits) {
|
|
dev_err(DEV, "bitmap overflow (e:%lu) while decoding bm RLE packet\n", e);
|
|
return FAILED;
|
|
}
|
|
_drbd_bm_set_bits(mdev, s, e);
|
|
}
|
|
|
|
if (have < bits) {
|
|
dev_err(DEV, "bitmap decoding error: h:%d b:%d la:0x%08llx l:%u/%u\n",
|
|
have, bits, look_ahead,
|
|
(unsigned int)(bs.cur.b - p->code),
|
|
(unsigned int)bs.buf_len);
|
|
return FAILED;
|
|
}
|
|
look_ahead >>= bits;
|
|
have -= bits;
|
|
|
|
bits = bitstream_get_bits(&bs, &tmp, 64 - have);
|
|
if (bits < 0)
|
|
return FAILED;
|
|
look_ahead |= tmp << have;
|
|
have += bits;
|
|
}
|
|
|
|
c->bit_offset = s;
|
|
bm_xfer_ctx_bit_to_word_offset(c);
|
|
|
|
return (s == c->bm_bits) ? DONE : OK;
|
|
}
|
|
|
|
static enum receive_bitmap_ret
|
|
decode_bitmap_c(struct drbd_conf *mdev,
|
|
struct p_compressed_bm *p,
|
|
struct bm_xfer_ctx *c)
|
|
{
|
|
if (DCBP_get_code(p) == RLE_VLI_Bits)
|
|
return recv_bm_rle_bits(mdev, p, c);
|
|
|
|
/* other variants had been implemented for evaluation,
|
|
* but have been dropped as this one turned out to be "best"
|
|
* during all our tests. */
|
|
|
|
dev_err(DEV, "receive_bitmap_c: unknown encoding %u\n", p->encoding);
|
|
drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR));
|
|
return FAILED;
|
|
}
|
|
|
|
void INFO_bm_xfer_stats(struct drbd_conf *mdev,
|
|
const char *direction, struct bm_xfer_ctx *c)
|
|
{
|
|
/* what would it take to transfer it "plaintext" */
|
|
unsigned plain = sizeof(struct p_header) *
|
|
((c->bm_words+BM_PACKET_WORDS-1)/BM_PACKET_WORDS+1)
|
|
+ c->bm_words * sizeof(long);
|
|
unsigned total = c->bytes[0] + c->bytes[1];
|
|
unsigned r;
|
|
|
|
/* total can not be zero. but just in case: */
|
|
if (total == 0)
|
|
return;
|
|
|
|
/* don't report if not compressed */
|
|
if (total >= plain)
|
|
return;
|
|
|
|
/* total < plain. check for overflow, still */
|
|
r = (total > UINT_MAX/1000) ? (total / (plain/1000))
|
|
: (1000 * total / plain);
|
|
|
|
if (r > 1000)
|
|
r = 1000;
|
|
|
|
r = 1000 - r;
|
|
dev_info(DEV, "%s bitmap stats [Bytes(packets)]: plain %u(%u), RLE %u(%u), "
|
|
"total %u; compression: %u.%u%%\n",
|
|
direction,
|
|
c->bytes[1], c->packets[1],
|
|
c->bytes[0], c->packets[0],
|
|
total, r/10, r % 10);
|
|
}
|
|
|
|
/* Since we are processing the bitfield from lower addresses to higher,
|
|
it does not matter if the process it in 32 bit chunks or 64 bit
|
|
chunks as long as it is little endian. (Understand it as byte stream,
|
|
beginning with the lowest byte...) If we would use big endian
|
|
we would need to process it from the highest address to the lowest,
|
|
in order to be agnostic to the 32 vs 64 bits issue.
|
|
|
|
returns 0 on failure, 1 if we successfully received it. */
|
|
static int receive_bitmap(struct drbd_conf *mdev, struct p_header *h)
|
|
{
|
|
struct bm_xfer_ctx c;
|
|
void *buffer;
|
|
enum receive_bitmap_ret ret;
|
|
int ok = FALSE;
|
|
|
|
wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt));
|
|
|
|
drbd_bm_lock(mdev, "receive bitmap");
|
|
|
|
/* maybe we should use some per thread scratch page,
|
|
* and allocate that during initial device creation? */
|
|
buffer = (unsigned long *) __get_free_page(GFP_NOIO);
|
|
if (!buffer) {
|
|
dev_err(DEV, "failed to allocate one page buffer in %s\n", __func__);
|
|
goto out;
|
|
}
|
|
|
|
c = (struct bm_xfer_ctx) {
|
|
.bm_bits = drbd_bm_bits(mdev),
|
|
.bm_words = drbd_bm_words(mdev),
|
|
};
|
|
|
|
do {
|
|
if (h->command == P_BITMAP) {
|
|
ret = receive_bitmap_plain(mdev, h, buffer, &c);
|
|
} else if (h->command == P_COMPRESSED_BITMAP) {
|
|
/* MAYBE: sanity check that we speak proto >= 90,
|
|
* and the feature is enabled! */
|
|
struct p_compressed_bm *p;
|
|
|
|
if (h->length > BM_PACKET_PAYLOAD_BYTES) {
|
|
dev_err(DEV, "ReportCBitmap packet too large\n");
|
|
goto out;
|
|
}
|
|
/* use the page buff */
|
|
p = buffer;
|
|
memcpy(p, h, sizeof(*h));
|
|
if (drbd_recv(mdev, p->head.payload, h->length) != h->length)
|
|
goto out;
|
|
if (p->head.length <= (sizeof(*p) - sizeof(p->head))) {
|
|
dev_err(DEV, "ReportCBitmap packet too small (l:%u)\n", p->head.length);
|
|
return FAILED;
|
|
}
|
|
ret = decode_bitmap_c(mdev, p, &c);
|
|
} else {
|
|
dev_warn(DEV, "receive_bitmap: h->command neither ReportBitMap nor ReportCBitMap (is 0x%x)", h->command);
|
|
goto out;
|
|
}
|
|
|
|
c.packets[h->command == P_BITMAP]++;
|
|
c.bytes[h->command == P_BITMAP] += sizeof(struct p_header) + h->length;
|
|
|
|
if (ret != OK)
|
|
break;
|
|
|
|
if (!drbd_recv_header(mdev, h))
|
|
goto out;
|
|
} while (ret == OK);
|
|
if (ret == FAILED)
|
|
goto out;
|
|
|
|
INFO_bm_xfer_stats(mdev, "receive", &c);
|
|
|
|
if (mdev->state.conn == C_WF_BITMAP_T) {
|
|
ok = !drbd_send_bitmap(mdev);
|
|
if (!ok)
|
|
goto out;
|
|
/* Omit CS_ORDERED with this state transition to avoid deadlocks. */
|
|
ok = _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE);
|
|
D_ASSERT(ok == SS_SUCCESS);
|
|
} else if (mdev->state.conn != C_WF_BITMAP_S) {
|
|
/* admin may have requested C_DISCONNECTING,
|
|
* other threads may have noticed network errors */
|
|
dev_info(DEV, "unexpected cstate (%s) in receive_bitmap\n",
|
|
drbd_conn_str(mdev->state.conn));
|
|
}
|
|
|
|
ok = TRUE;
|
|
out:
|
|
drbd_bm_unlock(mdev);
|
|
if (ok && mdev->state.conn == C_WF_BITMAP_S)
|
|
drbd_start_resync(mdev, C_SYNC_SOURCE);
|
|
free_page((unsigned long) buffer);
|
|
return ok;
|
|
}
|
|
|
|
static int receive_skip_(struct drbd_conf *mdev, struct p_header *h, int silent)
|
|
{
|
|
/* TODO zero copy sink :) */
|
|
static char sink[128];
|
|
int size, want, r;
|
|
|
|
if (!silent)
|
|
dev_warn(DEV, "skipping unknown optional packet type %d, l: %d!\n",
|
|
h->command, h->length);
|
|
|
|
size = h->length;
|
|
while (size > 0) {
|
|
want = min_t(int, size, sizeof(sink));
|
|
r = drbd_recv(mdev, sink, want);
|
|
ERR_IF(r <= 0) break;
|
|
size -= r;
|
|
}
|
|
return size == 0;
|
|
}
|
|
|
|
static int receive_skip(struct drbd_conf *mdev, struct p_header *h)
|
|
{
|
|
return receive_skip_(mdev, h, 0);
|
|
}
|
|
|
|
static int receive_skip_silent(struct drbd_conf *mdev, struct p_header *h)
|
|
{
|
|
return receive_skip_(mdev, h, 1);
|
|
}
|
|
|
|
static int receive_UnplugRemote(struct drbd_conf *mdev, struct p_header *h)
|
|
{
|
|
if (mdev->state.disk >= D_INCONSISTENT)
|
|
drbd_kick_lo(mdev);
|
|
|
|
/* Make sure we've acked all the TCP data associated
|
|
* with the data requests being unplugged */
|
|
drbd_tcp_quickack(mdev->data.socket);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
typedef int (*drbd_cmd_handler_f)(struct drbd_conf *, struct p_header *);
|
|
|
|
static drbd_cmd_handler_f drbd_default_handler[] = {
|
|
[P_DATA] = receive_Data,
|
|
[P_DATA_REPLY] = receive_DataReply,
|
|
[P_RS_DATA_REPLY] = receive_RSDataReply,
|
|
[P_BARRIER] = receive_Barrier,
|
|
[P_BITMAP] = receive_bitmap,
|
|
[P_COMPRESSED_BITMAP] = receive_bitmap,
|
|
[P_UNPLUG_REMOTE] = receive_UnplugRemote,
|
|
[P_DATA_REQUEST] = receive_DataRequest,
|
|
[P_RS_DATA_REQUEST] = receive_DataRequest,
|
|
[P_SYNC_PARAM] = receive_SyncParam,
|
|
[P_SYNC_PARAM89] = receive_SyncParam,
|
|
[P_PROTOCOL] = receive_protocol,
|
|
[P_UUIDS] = receive_uuids,
|
|
[P_SIZES] = receive_sizes,
|
|
[P_STATE] = receive_state,
|
|
[P_STATE_CHG_REQ] = receive_req_state,
|
|
[P_SYNC_UUID] = receive_sync_uuid,
|
|
[P_OV_REQUEST] = receive_DataRequest,
|
|
[P_OV_REPLY] = receive_DataRequest,
|
|
[P_CSUM_RS_REQUEST] = receive_DataRequest,
|
|
[P_DELAY_PROBE] = receive_skip_silent,
|
|
/* anything missing from this table is in
|
|
* the asender_tbl, see get_asender_cmd */
|
|
[P_MAX_CMD] = NULL,
|
|
};
|
|
|
|
static drbd_cmd_handler_f *drbd_cmd_handler = drbd_default_handler;
|
|
static drbd_cmd_handler_f *drbd_opt_cmd_handler;
|
|
|
|
static void drbdd(struct drbd_conf *mdev)
|
|
{
|
|
drbd_cmd_handler_f handler;
|
|
struct p_header *header = &mdev->data.rbuf.header;
|
|
|
|
while (get_t_state(&mdev->receiver) == Running) {
|
|
drbd_thread_current_set_cpu(mdev);
|
|
if (!drbd_recv_header(mdev, header)) {
|
|
drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR));
|
|
break;
|
|
}
|
|
|
|
if (header->command < P_MAX_CMD)
|
|
handler = drbd_cmd_handler[header->command];
|
|
else if (P_MAY_IGNORE < header->command
|
|
&& header->command < P_MAX_OPT_CMD)
|
|
handler = drbd_opt_cmd_handler[header->command-P_MAY_IGNORE];
|
|
else if (header->command > P_MAX_OPT_CMD)
|
|
handler = receive_skip;
|
|
else
|
|
handler = NULL;
|
|
|
|
if (unlikely(!handler)) {
|
|
dev_err(DEV, "unknown packet type %d, l: %d!\n",
|
|
header->command, header->length);
|
|
drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR));
|
|
break;
|
|
}
|
|
if (unlikely(!handler(mdev, header))) {
|
|
dev_err(DEV, "error receiving %s, l: %d!\n",
|
|
cmdname(header->command), header->length);
|
|
drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR));
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
void drbd_flush_workqueue(struct drbd_conf *mdev)
|
|
{
|
|
struct drbd_wq_barrier barr;
|
|
|
|
barr.w.cb = w_prev_work_done;
|
|
init_completion(&barr.done);
|
|
drbd_queue_work(&mdev->data.work, &barr.w);
|
|
wait_for_completion(&barr.done);
|
|
}
|
|
|
|
static void drbd_disconnect(struct drbd_conf *mdev)
|
|
{
|
|
enum drbd_fencing_p fp;
|
|
union drbd_state os, ns;
|
|
int rv = SS_UNKNOWN_ERROR;
|
|
unsigned int i;
|
|
|
|
if (mdev->state.conn == C_STANDALONE)
|
|
return;
|
|
if (mdev->state.conn >= C_WF_CONNECTION)
|
|
dev_err(DEV, "ASSERT FAILED cstate = %s, expected < WFConnection\n",
|
|
drbd_conn_str(mdev->state.conn));
|
|
|
|
/* asender does not clean up anything. it must not interfere, either */
|
|
drbd_thread_stop(&mdev->asender);
|
|
drbd_free_sock(mdev);
|
|
|
|
spin_lock_irq(&mdev->req_lock);
|
|
_drbd_wait_ee_list_empty(mdev, &mdev->active_ee);
|
|
_drbd_wait_ee_list_empty(mdev, &mdev->sync_ee);
|
|
_drbd_wait_ee_list_empty(mdev, &mdev->read_ee);
|
|
spin_unlock_irq(&mdev->req_lock);
|
|
|
|
/* We do not have data structures that would allow us to
|
|
* get the rs_pending_cnt down to 0 again.
|
|
* * On C_SYNC_TARGET we do not have any data structures describing
|
|
* the pending RSDataRequest's we have sent.
|
|
* * On C_SYNC_SOURCE there is no data structure that tracks
|
|
* the P_RS_DATA_REPLY blocks that we sent to the SyncTarget.
|
|
* And no, it is not the sum of the reference counts in the
|
|
* resync_LRU. The resync_LRU tracks the whole operation including
|
|
* the disk-IO, while the rs_pending_cnt only tracks the blocks
|
|
* on the fly. */
|
|
drbd_rs_cancel_all(mdev);
|
|
mdev->rs_total = 0;
|
|
mdev->rs_failed = 0;
|
|
atomic_set(&mdev->rs_pending_cnt, 0);
|
|
wake_up(&mdev->misc_wait);
|
|
|
|
/* make sure syncer is stopped and w_resume_next_sg queued */
|
|
del_timer_sync(&mdev->resync_timer);
|
|
set_bit(STOP_SYNC_TIMER, &mdev->flags);
|
|
resync_timer_fn((unsigned long)mdev);
|
|
|
|
/* wait for all w_e_end_data_req, w_e_end_rsdata_req, w_send_barrier,
|
|
* w_make_resync_request etc. which may still be on the worker queue
|
|
* to be "canceled" */
|
|
drbd_flush_workqueue(mdev);
|
|
|
|
/* This also does reclaim_net_ee(). If we do this too early, we might
|
|
* miss some resync ee and pages.*/
|
|
drbd_process_done_ee(mdev);
|
|
|
|
kfree(mdev->p_uuid);
|
|
mdev->p_uuid = NULL;
|
|
|
|
if (!mdev->state.susp)
|
|
tl_clear(mdev);
|
|
|
|
dev_info(DEV, "Connection closed\n");
|
|
|
|
drbd_md_sync(mdev);
|
|
|
|
fp = FP_DONT_CARE;
|
|
if (get_ldev(mdev)) {
|
|
fp = mdev->ldev->dc.fencing;
|
|
put_ldev(mdev);
|
|
}
|
|
|
|
if (mdev->state.role == R_PRIMARY && fp >= FP_RESOURCE && mdev->state.pdsk >= D_UNKNOWN)
|
|
drbd_try_outdate_peer_async(mdev);
|
|
|
|
spin_lock_irq(&mdev->req_lock);
|
|
os = mdev->state;
|
|
if (os.conn >= C_UNCONNECTED) {
|
|
/* Do not restart in case we are C_DISCONNECTING */
|
|
ns = os;
|
|
ns.conn = C_UNCONNECTED;
|
|
rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
|
|
}
|
|
spin_unlock_irq(&mdev->req_lock);
|
|
|
|
if (os.conn == C_DISCONNECTING) {
|
|
struct hlist_head *h;
|
|
wait_event(mdev->misc_wait, atomic_read(&mdev->net_cnt) == 0);
|
|
|
|
/* we must not free the tl_hash
|
|
* while application io is still on the fly */
|
|
wait_event(mdev->misc_wait, atomic_read(&mdev->ap_bio_cnt) == 0);
|
|
|
|
spin_lock_irq(&mdev->req_lock);
|
|
/* paranoia code */
|
|
for (h = mdev->ee_hash; h < mdev->ee_hash + mdev->ee_hash_s; h++)
|
|
if (h->first)
|
|
dev_err(DEV, "ASSERT FAILED ee_hash[%u].first == %p, expected NULL\n",
|
|
(int)(h - mdev->ee_hash), h->first);
|
|
kfree(mdev->ee_hash);
|
|
mdev->ee_hash = NULL;
|
|
mdev->ee_hash_s = 0;
|
|
|
|
/* paranoia code */
|
|
for (h = mdev->tl_hash; h < mdev->tl_hash + mdev->tl_hash_s; h++)
|
|
if (h->first)
|
|
dev_err(DEV, "ASSERT FAILED tl_hash[%u] == %p, expected NULL\n",
|
|
(int)(h - mdev->tl_hash), h->first);
|
|
kfree(mdev->tl_hash);
|
|
mdev->tl_hash = NULL;
|
|
mdev->tl_hash_s = 0;
|
|
spin_unlock_irq(&mdev->req_lock);
|
|
|
|
crypto_free_hash(mdev->cram_hmac_tfm);
|
|
mdev->cram_hmac_tfm = NULL;
|
|
|
|
kfree(mdev->net_conf);
|
|
mdev->net_conf = NULL;
|
|
drbd_request_state(mdev, NS(conn, C_STANDALONE));
|
|
}
|
|
|
|
/* tcp_close and release of sendpage pages can be deferred. I don't
|
|
* want to use SO_LINGER, because apparently it can be deferred for
|
|
* more than 20 seconds (longest time I checked).
|
|
*
|
|
* Actually we don't care for exactly when the network stack does its
|
|
* put_page(), but release our reference on these pages right here.
|
|
*/
|
|
i = drbd_release_ee(mdev, &mdev->net_ee);
|
|
if (i)
|
|
dev_info(DEV, "net_ee not empty, killed %u entries\n", i);
|
|
i = atomic_read(&mdev->pp_in_use);
|
|
if (i)
|
|
dev_info(DEV, "pp_in_use = %d, expected 0\n", i);
|
|
|
|
D_ASSERT(list_empty(&mdev->read_ee));
|
|
D_ASSERT(list_empty(&mdev->active_ee));
|
|
D_ASSERT(list_empty(&mdev->sync_ee));
|
|
D_ASSERT(list_empty(&mdev->done_ee));
|
|
|
|
/* ok, no more ee's on the fly, it is safe to reset the epoch_size */
|
|
atomic_set(&mdev->current_epoch->epoch_size, 0);
|
|
D_ASSERT(list_empty(&mdev->current_epoch->list));
|
|
}
|
|
|
|
/*
|
|
* We support PRO_VERSION_MIN to PRO_VERSION_MAX. The protocol version
|
|
* we can agree on is stored in agreed_pro_version.
|
|
*
|
|
* feature flags and the reserved array should be enough room for future
|
|
* enhancements of the handshake protocol, and possible plugins...
|
|
*
|
|
* for now, they are expected to be zero, but ignored.
|
|
*/
|
|
static int drbd_send_handshake(struct drbd_conf *mdev)
|
|
{
|
|
/* ASSERT current == mdev->receiver ... */
|
|
struct p_handshake *p = &mdev->data.sbuf.handshake;
|
|
int ok;
|
|
|
|
if (mutex_lock_interruptible(&mdev->data.mutex)) {
|
|
dev_err(DEV, "interrupted during initial handshake\n");
|
|
return 0; /* interrupted. not ok. */
|
|
}
|
|
|
|
if (mdev->data.socket == NULL) {
|
|
mutex_unlock(&mdev->data.mutex);
|
|
return 0;
|
|
}
|
|
|
|
memset(p, 0, sizeof(*p));
|
|
p->protocol_min = cpu_to_be32(PRO_VERSION_MIN);
|
|
p->protocol_max = cpu_to_be32(PRO_VERSION_MAX);
|
|
ok = _drbd_send_cmd( mdev, mdev->data.socket, P_HAND_SHAKE,
|
|
(struct p_header *)p, sizeof(*p), 0 );
|
|
mutex_unlock(&mdev->data.mutex);
|
|
return ok;
|
|
}
|
|
|
|
/*
|
|
* return values:
|
|
* 1 yes, we have a valid connection
|
|
* 0 oops, did not work out, please try again
|
|
* -1 peer talks different language,
|
|
* no point in trying again, please go standalone.
|
|
*/
|
|
static int drbd_do_handshake(struct drbd_conf *mdev)
|
|
{
|
|
/* ASSERT current == mdev->receiver ... */
|
|
struct p_handshake *p = &mdev->data.rbuf.handshake;
|
|
const int expect = sizeof(struct p_handshake)
|
|
-sizeof(struct p_header);
|
|
int rv;
|
|
|
|
rv = drbd_send_handshake(mdev);
|
|
if (!rv)
|
|
return 0;
|
|
|
|
rv = drbd_recv_header(mdev, &p->head);
|
|
if (!rv)
|
|
return 0;
|
|
|
|
if (p->head.command != P_HAND_SHAKE) {
|
|
dev_err(DEV, "expected HandShake packet, received: %s (0x%04x)\n",
|
|
cmdname(p->head.command), p->head.command);
|
|
return -1;
|
|
}
|
|
|
|
if (p->head.length != expect) {
|
|
dev_err(DEV, "expected HandShake length: %u, received: %u\n",
|
|
expect, p->head.length);
|
|
return -1;
|
|
}
|
|
|
|
rv = drbd_recv(mdev, &p->head.payload, expect);
|
|
|
|
if (rv != expect) {
|
|
dev_err(DEV, "short read receiving handshake packet: l=%u\n", rv);
|
|
return 0;
|
|
}
|
|
|
|
p->protocol_min = be32_to_cpu(p->protocol_min);
|
|
p->protocol_max = be32_to_cpu(p->protocol_max);
|
|
if (p->protocol_max == 0)
|
|
p->protocol_max = p->protocol_min;
|
|
|
|
if (PRO_VERSION_MAX < p->protocol_min ||
|
|
PRO_VERSION_MIN > p->protocol_max)
|
|
goto incompat;
|
|
|
|
mdev->agreed_pro_version = min_t(int, PRO_VERSION_MAX, p->protocol_max);
|
|
|
|
dev_info(DEV, "Handshake successful: "
|
|
"Agreed network protocol version %d\n", mdev->agreed_pro_version);
|
|
|
|
return 1;
|
|
|
|
incompat:
|
|
dev_err(DEV, "incompatible DRBD dialects: "
|
|
"I support %d-%d, peer supports %d-%d\n",
|
|
PRO_VERSION_MIN, PRO_VERSION_MAX,
|
|
p->protocol_min, p->protocol_max);
|
|
return -1;
|
|
}
|
|
|
|
#if !defined(CONFIG_CRYPTO_HMAC) && !defined(CONFIG_CRYPTO_HMAC_MODULE)
|
|
static int drbd_do_auth(struct drbd_conf *mdev)
|
|
{
|
|
dev_err(DEV, "This kernel was build without CONFIG_CRYPTO_HMAC.\n");
|
|
dev_err(DEV, "You need to disable 'cram-hmac-alg' in drbd.conf.\n");
|
|
return -1;
|
|
}
|
|
#else
|
|
#define CHALLENGE_LEN 64
|
|
|
|
/* Return value:
|
|
1 - auth succeeded,
|
|
0 - failed, try again (network error),
|
|
-1 - auth failed, don't try again.
|
|
*/
|
|
|
|
static int drbd_do_auth(struct drbd_conf *mdev)
|
|
{
|
|
char my_challenge[CHALLENGE_LEN]; /* 64 Bytes... */
|
|
struct scatterlist sg;
|
|
char *response = NULL;
|
|
char *right_response = NULL;
|
|
char *peers_ch = NULL;
|
|
struct p_header p;
|
|
unsigned int key_len = strlen(mdev->net_conf->shared_secret);
|
|
unsigned int resp_size;
|
|
struct hash_desc desc;
|
|
int rv;
|
|
|
|
desc.tfm = mdev->cram_hmac_tfm;
|
|
desc.flags = 0;
|
|
|
|
rv = crypto_hash_setkey(mdev->cram_hmac_tfm,
|
|
(u8 *)mdev->net_conf->shared_secret, key_len);
|
|
if (rv) {
|
|
dev_err(DEV, "crypto_hash_setkey() failed with %d\n", rv);
|
|
rv = -1;
|
|
goto fail;
|
|
}
|
|
|
|
get_random_bytes(my_challenge, CHALLENGE_LEN);
|
|
|
|
rv = drbd_send_cmd2(mdev, P_AUTH_CHALLENGE, my_challenge, CHALLENGE_LEN);
|
|
if (!rv)
|
|
goto fail;
|
|
|
|
rv = drbd_recv_header(mdev, &p);
|
|
if (!rv)
|
|
goto fail;
|
|
|
|
if (p.command != P_AUTH_CHALLENGE) {
|
|
dev_err(DEV, "expected AuthChallenge packet, received: %s (0x%04x)\n",
|
|
cmdname(p.command), p.command);
|
|
rv = 0;
|
|
goto fail;
|
|
}
|
|
|
|
if (p.length > CHALLENGE_LEN*2) {
|
|
dev_err(DEV, "expected AuthChallenge payload too big.\n");
|
|
rv = -1;
|
|
goto fail;
|
|
}
|
|
|
|
peers_ch = kmalloc(p.length, GFP_NOIO);
|
|
if (peers_ch == NULL) {
|
|
dev_err(DEV, "kmalloc of peers_ch failed\n");
|
|
rv = -1;
|
|
goto fail;
|
|
}
|
|
|
|
rv = drbd_recv(mdev, peers_ch, p.length);
|
|
|
|
if (rv != p.length) {
|
|
dev_err(DEV, "short read AuthChallenge: l=%u\n", rv);
|
|
rv = 0;
|
|
goto fail;
|
|
}
|
|
|
|
resp_size = crypto_hash_digestsize(mdev->cram_hmac_tfm);
|
|
response = kmalloc(resp_size, GFP_NOIO);
|
|
if (response == NULL) {
|
|
dev_err(DEV, "kmalloc of response failed\n");
|
|
rv = -1;
|
|
goto fail;
|
|
}
|
|
|
|
sg_init_table(&sg, 1);
|
|
sg_set_buf(&sg, peers_ch, p.length);
|
|
|
|
rv = crypto_hash_digest(&desc, &sg, sg.length, response);
|
|
if (rv) {
|
|
dev_err(DEV, "crypto_hash_digest() failed with %d\n", rv);
|
|
rv = -1;
|
|
goto fail;
|
|
}
|
|
|
|
rv = drbd_send_cmd2(mdev, P_AUTH_RESPONSE, response, resp_size);
|
|
if (!rv)
|
|
goto fail;
|
|
|
|
rv = drbd_recv_header(mdev, &p);
|
|
if (!rv)
|
|
goto fail;
|
|
|
|
if (p.command != P_AUTH_RESPONSE) {
|
|
dev_err(DEV, "expected AuthResponse packet, received: %s (0x%04x)\n",
|
|
cmdname(p.command), p.command);
|
|
rv = 0;
|
|
goto fail;
|
|
}
|
|
|
|
if (p.length != resp_size) {
|
|
dev_err(DEV, "expected AuthResponse payload of wrong size\n");
|
|
rv = 0;
|
|
goto fail;
|
|
}
|
|
|
|
rv = drbd_recv(mdev, response , resp_size);
|
|
|
|
if (rv != resp_size) {
|
|
dev_err(DEV, "short read receiving AuthResponse: l=%u\n", rv);
|
|
rv = 0;
|
|
goto fail;
|
|
}
|
|
|
|
right_response = kmalloc(resp_size, GFP_NOIO);
|
|
if (right_response == NULL) {
|
|
dev_err(DEV, "kmalloc of right_response failed\n");
|
|
rv = -1;
|
|
goto fail;
|
|
}
|
|
|
|
sg_set_buf(&sg, my_challenge, CHALLENGE_LEN);
|
|
|
|
rv = crypto_hash_digest(&desc, &sg, sg.length, right_response);
|
|
if (rv) {
|
|
dev_err(DEV, "crypto_hash_digest() failed with %d\n", rv);
|
|
rv = -1;
|
|
goto fail;
|
|
}
|
|
|
|
rv = !memcmp(response, right_response, resp_size);
|
|
|
|
if (rv)
|
|
dev_info(DEV, "Peer authenticated using %d bytes of '%s' HMAC\n",
|
|
resp_size, mdev->net_conf->cram_hmac_alg);
|
|
else
|
|
rv = -1;
|
|
|
|
fail:
|
|
kfree(peers_ch);
|
|
kfree(response);
|
|
kfree(right_response);
|
|
|
|
return rv;
|
|
}
|
|
#endif
|
|
|
|
int drbdd_init(struct drbd_thread *thi)
|
|
{
|
|
struct drbd_conf *mdev = thi->mdev;
|
|
unsigned int minor = mdev_to_minor(mdev);
|
|
int h;
|
|
|
|
sprintf(current->comm, "drbd%d_receiver", minor);
|
|
|
|
dev_info(DEV, "receiver (re)started\n");
|
|
|
|
do {
|
|
h = drbd_connect(mdev);
|
|
if (h == 0) {
|
|
drbd_disconnect(mdev);
|
|
__set_current_state(TASK_INTERRUPTIBLE);
|
|
schedule_timeout(HZ);
|
|
}
|
|
if (h == -1) {
|
|
dev_warn(DEV, "Discarding network configuration.\n");
|
|
drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
|
|
}
|
|
} while (h == 0);
|
|
|
|
if (h > 0) {
|
|
if (get_net_conf(mdev)) {
|
|
drbdd(mdev);
|
|
put_net_conf(mdev);
|
|
}
|
|
}
|
|
|
|
drbd_disconnect(mdev);
|
|
|
|
dev_info(DEV, "receiver terminated\n");
|
|
return 0;
|
|
}
|
|
|
|
/* ********* acknowledge sender ******** */
|
|
|
|
static int got_RqSReply(struct drbd_conf *mdev, struct p_header *h)
|
|
{
|
|
struct p_req_state_reply *p = (struct p_req_state_reply *)h;
|
|
|
|
int retcode = be32_to_cpu(p->retcode);
|
|
|
|
if (retcode >= SS_SUCCESS) {
|
|
set_bit(CL_ST_CHG_SUCCESS, &mdev->flags);
|
|
} else {
|
|
set_bit(CL_ST_CHG_FAIL, &mdev->flags);
|
|
dev_err(DEV, "Requested state change failed by peer: %s (%d)\n",
|
|
drbd_set_st_err_str(retcode), retcode);
|
|
}
|
|
wake_up(&mdev->state_wait);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static int got_Ping(struct drbd_conf *mdev, struct p_header *h)
|
|
{
|
|
return drbd_send_ping_ack(mdev);
|
|
|
|
}
|
|
|
|
static int got_PingAck(struct drbd_conf *mdev, struct p_header *h)
|
|
{
|
|
/* restore idle timeout */
|
|
mdev->meta.socket->sk->sk_rcvtimeo = mdev->net_conf->ping_int*HZ;
|
|
if (!test_and_set_bit(GOT_PING_ACK, &mdev->flags))
|
|
wake_up(&mdev->misc_wait);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static int got_IsInSync(struct drbd_conf *mdev, struct p_header *h)
|
|
{
|
|
struct p_block_ack *p = (struct p_block_ack *)h;
|
|
sector_t sector = be64_to_cpu(p->sector);
|
|
int blksize = be32_to_cpu(p->blksize);
|
|
|
|
D_ASSERT(mdev->agreed_pro_version >= 89);
|
|
|
|
update_peer_seq(mdev, be32_to_cpu(p->seq_num));
|
|
|
|
drbd_rs_complete_io(mdev, sector);
|
|
drbd_set_in_sync(mdev, sector, blksize);
|
|
/* rs_same_csums is supposed to count in units of BM_BLOCK_SIZE */
|
|
mdev->rs_same_csum += (blksize >> BM_BLOCK_SHIFT);
|
|
dec_rs_pending(mdev);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/* when we receive the ACK for a write request,
|
|
* verify that we actually know about it */
|
|
static struct drbd_request *_ack_id_to_req(struct drbd_conf *mdev,
|
|
u64 id, sector_t sector)
|
|
{
|
|
struct hlist_head *slot = tl_hash_slot(mdev, sector);
|
|
struct hlist_node *n;
|
|
struct drbd_request *req;
|
|
|
|
hlist_for_each_entry(req, n, slot, colision) {
|
|
if ((unsigned long)req == (unsigned long)id) {
|
|
if (req->sector != sector) {
|
|
dev_err(DEV, "_ack_id_to_req: found req %p but it has "
|
|
"wrong sector (%llus versus %llus)\n", req,
|
|
(unsigned long long)req->sector,
|
|
(unsigned long long)sector);
|
|
break;
|
|
}
|
|
return req;
|
|
}
|
|
}
|
|
dev_err(DEV, "_ack_id_to_req: failed to find req %p, sector %llus in list\n",
|
|
(void *)(unsigned long)id, (unsigned long long)sector);
|
|
return NULL;
|
|
}
|
|
|
|
typedef struct drbd_request *(req_validator_fn)
|
|
(struct drbd_conf *mdev, u64 id, sector_t sector);
|
|
|
|
static int validate_req_change_req_state(struct drbd_conf *mdev,
|
|
u64 id, sector_t sector, req_validator_fn validator,
|
|
const char *func, enum drbd_req_event what)
|
|
{
|
|
struct drbd_request *req;
|
|
struct bio_and_error m;
|
|
|
|
spin_lock_irq(&mdev->req_lock);
|
|
req = validator(mdev, id, sector);
|
|
if (unlikely(!req)) {
|
|
spin_unlock_irq(&mdev->req_lock);
|
|
dev_err(DEV, "%s: got a corrupt block_id/sector pair\n", func);
|
|
return FALSE;
|
|
}
|
|
__req_mod(req, what, &m);
|
|
spin_unlock_irq(&mdev->req_lock);
|
|
|
|
if (m.bio)
|
|
complete_master_bio(mdev, &m);
|
|
return TRUE;
|
|
}
|
|
|
|
static int got_BlockAck(struct drbd_conf *mdev, struct p_header *h)
|
|
{
|
|
struct p_block_ack *p = (struct p_block_ack *)h;
|
|
sector_t sector = be64_to_cpu(p->sector);
|
|
int blksize = be32_to_cpu(p->blksize);
|
|
enum drbd_req_event what;
|
|
|
|
update_peer_seq(mdev, be32_to_cpu(p->seq_num));
|
|
|
|
if (is_syncer_block_id(p->block_id)) {
|
|
drbd_set_in_sync(mdev, sector, blksize);
|
|
dec_rs_pending(mdev);
|
|
return TRUE;
|
|
}
|
|
switch (be16_to_cpu(h->command)) {
|
|
case P_RS_WRITE_ACK:
|
|
D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C);
|
|
what = write_acked_by_peer_and_sis;
|
|
break;
|
|
case P_WRITE_ACK:
|
|
D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C);
|
|
what = write_acked_by_peer;
|
|
break;
|
|
case P_RECV_ACK:
|
|
D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_B);
|
|
what = recv_acked_by_peer;
|
|
break;
|
|
case P_DISCARD_ACK:
|
|
D_ASSERT(mdev->net_conf->wire_protocol == DRBD_PROT_C);
|
|
what = conflict_discarded_by_peer;
|
|
break;
|
|
default:
|
|
D_ASSERT(0);
|
|
return FALSE;
|
|
}
|
|
|
|
return validate_req_change_req_state(mdev, p->block_id, sector,
|
|
_ack_id_to_req, __func__ , what);
|
|
}
|
|
|
|
static int got_NegAck(struct drbd_conf *mdev, struct p_header *h)
|
|
{
|
|
struct p_block_ack *p = (struct p_block_ack *)h;
|
|
sector_t sector = be64_to_cpu(p->sector);
|
|
|
|
if (__ratelimit(&drbd_ratelimit_state))
|
|
dev_warn(DEV, "Got NegAck packet. Peer is in troubles?\n");
|
|
|
|
update_peer_seq(mdev, be32_to_cpu(p->seq_num));
|
|
|
|
if (is_syncer_block_id(p->block_id)) {
|
|
int size = be32_to_cpu(p->blksize);
|
|
dec_rs_pending(mdev);
|
|
drbd_rs_failed_io(mdev, sector, size);
|
|
return TRUE;
|
|
}
|
|
return validate_req_change_req_state(mdev, p->block_id, sector,
|
|
_ack_id_to_req, __func__ , neg_acked);
|
|
}
|
|
|
|
static int got_NegDReply(struct drbd_conf *mdev, struct p_header *h)
|
|
{
|
|
struct p_block_ack *p = (struct p_block_ack *)h;
|
|
sector_t sector = be64_to_cpu(p->sector);
|
|
|
|
update_peer_seq(mdev, be32_to_cpu(p->seq_num));
|
|
dev_err(DEV, "Got NegDReply; Sector %llus, len %u; Fail original request.\n",
|
|
(unsigned long long)sector, be32_to_cpu(p->blksize));
|
|
|
|
return validate_req_change_req_state(mdev, p->block_id, sector,
|
|
_ar_id_to_req, __func__ , neg_acked);
|
|
}
|
|
|
|
static int got_NegRSDReply(struct drbd_conf *mdev, struct p_header *h)
|
|
{
|
|
sector_t sector;
|
|
int size;
|
|
struct p_block_ack *p = (struct p_block_ack *)h;
|
|
|
|
sector = be64_to_cpu(p->sector);
|
|
size = be32_to_cpu(p->blksize);
|
|
|
|
update_peer_seq(mdev, be32_to_cpu(p->seq_num));
|
|
|
|
dec_rs_pending(mdev);
|
|
|
|
if (get_ldev_if_state(mdev, D_FAILED)) {
|
|
drbd_rs_complete_io(mdev, sector);
|
|
drbd_rs_failed_io(mdev, sector, size);
|
|
put_ldev(mdev);
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static int got_BarrierAck(struct drbd_conf *mdev, struct p_header *h)
|
|
{
|
|
struct p_barrier_ack *p = (struct p_barrier_ack *)h;
|
|
|
|
tl_release(mdev, p->barrier, be32_to_cpu(p->set_size));
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static int got_OVResult(struct drbd_conf *mdev, struct p_header *h)
|
|
{
|
|
struct p_block_ack *p = (struct p_block_ack *)h;
|
|
struct drbd_work *w;
|
|
sector_t sector;
|
|
int size;
|
|
|
|
sector = be64_to_cpu(p->sector);
|
|
size = be32_to_cpu(p->blksize);
|
|
|
|
update_peer_seq(mdev, be32_to_cpu(p->seq_num));
|
|
|
|
if (be64_to_cpu(p->block_id) == ID_OUT_OF_SYNC)
|
|
drbd_ov_oos_found(mdev, sector, size);
|
|
else
|
|
ov_oos_print(mdev);
|
|
|
|
drbd_rs_complete_io(mdev, sector);
|
|
dec_rs_pending(mdev);
|
|
|
|
if (--mdev->ov_left == 0) {
|
|
w = kmalloc(sizeof(*w), GFP_NOIO);
|
|
if (w) {
|
|
w->cb = w_ov_finished;
|
|
drbd_queue_work_front(&mdev->data.work, w);
|
|
} else {
|
|
dev_err(DEV, "kmalloc(w) failed.");
|
|
ov_oos_print(mdev);
|
|
drbd_resync_finished(mdev);
|
|
}
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
static int got_something_to_ignore_m(struct drbd_conf *mdev, struct p_header *h)
|
|
{
|
|
/* IGNORE */
|
|
return TRUE;
|
|
}
|
|
|
|
struct asender_cmd {
|
|
size_t pkt_size;
|
|
int (*process)(struct drbd_conf *mdev, struct p_header *h);
|
|
};
|
|
|
|
static struct asender_cmd *get_asender_cmd(int cmd)
|
|
{
|
|
static struct asender_cmd asender_tbl[] = {
|
|
/* anything missing from this table is in
|
|
* the drbd_cmd_handler (drbd_default_handler) table,
|
|
* see the beginning of drbdd() */
|
|
[P_PING] = { sizeof(struct p_header), got_Ping },
|
|
[P_PING_ACK] = { sizeof(struct p_header), got_PingAck },
|
|
[P_RECV_ACK] = { sizeof(struct p_block_ack), got_BlockAck },
|
|
[P_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck },
|
|
[P_RS_WRITE_ACK] = { sizeof(struct p_block_ack), got_BlockAck },
|
|
[P_DISCARD_ACK] = { sizeof(struct p_block_ack), got_BlockAck },
|
|
[P_NEG_ACK] = { sizeof(struct p_block_ack), got_NegAck },
|
|
[P_NEG_DREPLY] = { sizeof(struct p_block_ack), got_NegDReply },
|
|
[P_NEG_RS_DREPLY] = { sizeof(struct p_block_ack), got_NegRSDReply},
|
|
[P_OV_RESULT] = { sizeof(struct p_block_ack), got_OVResult },
|
|
[P_BARRIER_ACK] = { sizeof(struct p_barrier_ack), got_BarrierAck },
|
|
[P_STATE_CHG_REPLY] = { sizeof(struct p_req_state_reply), got_RqSReply },
|
|
[P_RS_IS_IN_SYNC] = { sizeof(struct p_block_ack), got_IsInSync },
|
|
[P_DELAY_PROBE] = { sizeof(struct p_delay_probe), got_something_to_ignore_m },
|
|
[P_MAX_CMD] = { 0, NULL },
|
|
};
|
|
if (cmd > P_MAX_CMD || asender_tbl[cmd].process == NULL)
|
|
return NULL;
|
|
return &asender_tbl[cmd];
|
|
}
|
|
|
|
int drbd_asender(struct drbd_thread *thi)
|
|
{
|
|
struct drbd_conf *mdev = thi->mdev;
|
|
struct p_header *h = &mdev->meta.rbuf.header;
|
|
struct asender_cmd *cmd = NULL;
|
|
|
|
int rv, len;
|
|
void *buf = h;
|
|
int received = 0;
|
|
int expect = sizeof(struct p_header);
|
|
int empty;
|
|
|
|
sprintf(current->comm, "drbd%d_asender", mdev_to_minor(mdev));
|
|
|
|
current->policy = SCHED_RR; /* Make this a realtime task! */
|
|
current->rt_priority = 2; /* more important than all other tasks */
|
|
|
|
while (get_t_state(thi) == Running) {
|
|
drbd_thread_current_set_cpu(mdev);
|
|
if (test_and_clear_bit(SEND_PING, &mdev->flags)) {
|
|
ERR_IF(!drbd_send_ping(mdev)) goto reconnect;
|
|
mdev->meta.socket->sk->sk_rcvtimeo =
|
|
mdev->net_conf->ping_timeo*HZ/10;
|
|
}
|
|
|
|
/* conditionally cork;
|
|
* it may hurt latency if we cork without much to send */
|
|
if (!mdev->net_conf->no_cork &&
|
|
3 < atomic_read(&mdev->unacked_cnt))
|
|
drbd_tcp_cork(mdev->meta.socket);
|
|
while (1) {
|
|
clear_bit(SIGNAL_ASENDER, &mdev->flags);
|
|
flush_signals(current);
|
|
if (!drbd_process_done_ee(mdev)) {
|
|
dev_err(DEV, "process_done_ee() = NOT_OK\n");
|
|
goto reconnect;
|
|
}
|
|
/* to avoid race with newly queued ACKs */
|
|
set_bit(SIGNAL_ASENDER, &mdev->flags);
|
|
spin_lock_irq(&mdev->req_lock);
|
|
empty = list_empty(&mdev->done_ee);
|
|
spin_unlock_irq(&mdev->req_lock);
|
|
/* new ack may have been queued right here,
|
|
* but then there is also a signal pending,
|
|
* and we start over... */
|
|
if (empty)
|
|
break;
|
|
}
|
|
/* but unconditionally uncork unless disabled */
|
|
if (!mdev->net_conf->no_cork)
|
|
drbd_tcp_uncork(mdev->meta.socket);
|
|
|
|
/* short circuit, recv_msg would return EINTR anyways. */
|
|
if (signal_pending(current))
|
|
continue;
|
|
|
|
rv = drbd_recv_short(mdev, mdev->meta.socket,
|
|
buf, expect-received, 0);
|
|
clear_bit(SIGNAL_ASENDER, &mdev->flags);
|
|
|
|
flush_signals(current);
|
|
|
|
/* Note:
|
|
* -EINTR (on meta) we got a signal
|
|
* -EAGAIN (on meta) rcvtimeo expired
|
|
* -ECONNRESET other side closed the connection
|
|
* -ERESTARTSYS (on data) we got a signal
|
|
* rv < 0 other than above: unexpected error!
|
|
* rv == expected: full header or command
|
|
* rv < expected: "woken" by signal during receive
|
|
* rv == 0 : "connection shut down by peer"
|
|
*/
|
|
if (likely(rv > 0)) {
|
|
received += rv;
|
|
buf += rv;
|
|
} else if (rv == 0) {
|
|
dev_err(DEV, "meta connection shut down by peer.\n");
|
|
goto reconnect;
|
|
} else if (rv == -EAGAIN) {
|
|
if (mdev->meta.socket->sk->sk_rcvtimeo ==
|
|
mdev->net_conf->ping_timeo*HZ/10) {
|
|
dev_err(DEV, "PingAck did not arrive in time.\n");
|
|
goto reconnect;
|
|
}
|
|
set_bit(SEND_PING, &mdev->flags);
|
|
continue;
|
|
} else if (rv == -EINTR) {
|
|
continue;
|
|
} else {
|
|
dev_err(DEV, "sock_recvmsg returned %d\n", rv);
|
|
goto reconnect;
|
|
}
|
|
|
|
if (received == expect && cmd == NULL) {
|
|
if (unlikely(h->magic != BE_DRBD_MAGIC)) {
|
|
dev_err(DEV, "magic?? on meta m: 0x%lx c: %d l: %d\n",
|
|
(long)be32_to_cpu(h->magic),
|
|
h->command, h->length);
|
|
goto reconnect;
|
|
}
|
|
cmd = get_asender_cmd(be16_to_cpu(h->command));
|
|
len = be16_to_cpu(h->length);
|
|
if (unlikely(cmd == NULL)) {
|
|
dev_err(DEV, "unknown command?? on meta m: 0x%lx c: %d l: %d\n",
|
|
(long)be32_to_cpu(h->magic),
|
|
h->command, h->length);
|
|
goto disconnect;
|
|
}
|
|
expect = cmd->pkt_size;
|
|
ERR_IF(len != expect-sizeof(struct p_header))
|
|
goto reconnect;
|
|
}
|
|
if (received == expect) {
|
|
D_ASSERT(cmd != NULL);
|
|
if (!cmd->process(mdev, h))
|
|
goto reconnect;
|
|
|
|
buf = h;
|
|
received = 0;
|
|
expect = sizeof(struct p_header);
|
|
cmd = NULL;
|
|
}
|
|
}
|
|
|
|
if (0) {
|
|
reconnect:
|
|
drbd_force_state(mdev, NS(conn, C_NETWORK_FAILURE));
|
|
}
|
|
if (0) {
|
|
disconnect:
|
|
drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
|
|
}
|
|
clear_bit(SIGNAL_ASENDER, &mdev->flags);
|
|
|
|
D_ASSERT(mdev->state.conn < C_CONNECTED);
|
|
dev_info(DEV, "asender terminated\n");
|
|
|
|
return 0;
|
|
}
|