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Date: Mon, 30 Mar 2009 18:47:15 +0200
From: Philipp Reisner <philipp.reisner@...bit.com>
To: linux-kernel@...r.kernel.org
Cc: gregkh@...e.de, jens.axboe@...cle.com, nab@...ingtidestorage.com,
andi@...stfloor.org, Philipp Reisner <philipp.reisner@...bit.com>,
Lars Ellenberg <lars.ellenberg@...bit.com>
Subject: [PATCH 07/13] DRBD: main
The DRBD state engine, and lots of other stuff, that does not have its own
source file.
Signed-off-by: Philipp Reisner <philipp.reisner@...bit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@...bit.com>
---
diff -uNrp linux-2.6.29/drivers/block/drbd/drbd_main.c linux-2.6.29-drbd/drivers/block/drbd/drbd_main.c
--- linux-2.6.29/drivers/block/drbd/drbd_main.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.29-drbd/drivers/block/drbd/drbd_main.c 2009-03-30 16:34:28.351153000 +0200
@@ -0,0 +1,4034 @@
+/*
+ drbd.c
+
+ This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
+
+ Copyright (C) 2001-2008, LINBIT Information Technologies GmbH.
+ Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@...bit.com>.
+ Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@...bit.com>.
+
+ drbd is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
+
+ drbd is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with drbd; see the file COPYING. If not, write to
+ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+
+ */
+
+#include <linux/autoconf.h>
+#include <linux/module.h>
+#include <linux/version.h>
+
+#include <asm/uaccess.h>
+#include <asm/types.h>
+#include <net/sock.h>
+#include <linux/ctype.h>
+#include <linux/smp_lock.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/proc_fs.h>
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/drbd_config.h>
+#include <linux/memcontrol.h>
+#include <linux/mm_inline.h>
+#include <linux/slab.h>
+#include <linux/random.h>
+#include <linux/reboot.h>
+#include <linux/notifier.h>
+#include <linux/kthread.h>
+
+#define __KERNEL_SYSCALLS__
+#include <linux/unistd.h>
+#include <linux/vmalloc.h>
+
+#include <linux/drbd.h>
+#include <linux/drbd_limits.h>
+#include "drbd_int.h"
+#include "drbd_req.h" /* only for _req_mod in tl_release and tl_clear */
+
+#include "drbd_vli.h"
+
+struct after_state_chg_work {
+ struct drbd_work w;
+ union drbd_state_t os;
+ union drbd_state_t ns;
+ enum chg_state_flags flags;
+ struct completion *done;
+};
+
+int drbdd_init(struct Drbd_thread *);
+int drbd_worker(struct Drbd_thread *);
+int drbd_asender(struct Drbd_thread *);
+
+int drbd_init(void);
+static int drbd_open(struct block_device *bdev, fmode_t mode);
+static int drbd_release(struct gendisk *gd, fmode_t mode);
+STATIC int w_after_state_ch(struct drbd_conf *mdev, struct drbd_work *w, int unused);
+STATIC void after_state_ch(struct drbd_conf *mdev, union drbd_state_t os,
+ union drbd_state_t ns, enum chg_state_flags flags);
+STATIC int w_md_sync(struct drbd_conf *mdev, struct drbd_work *w, int unused);
+STATIC void md_sync_timer_fn(unsigned long data);
+STATIC int w_bitmap_io(struct drbd_conf *mdev, struct drbd_work *w, int unused);
+
+MODULE_AUTHOR("Philipp Reisner <phil@...bit.com>, "
+ "Lars Ellenberg <lars@...bit.com>");
+MODULE_DESCRIPTION("drbd - Distributed Replicated Block Device v" REL_VERSION);
+MODULE_LICENSE("GPL");
+MODULE_PARM_DESC(minor_count, "Maximum number of drbd devices (1-255)");
+MODULE_ALIAS_BLOCKDEV_MAJOR(DRBD_MAJOR);
+
+#include <linux/moduleparam.h>
+/* allow_open_on_secondary */
+MODULE_PARM_DESC(allow_oos, "DONT USE!");
+/* thanks to these macros, if compiled into the kernel (not-module),
+ * this becomes the boot parameter drbd.minor_count */
+module_param(minor_count, uint, 0444);
+module_param(allow_oos, bool, 0);
+module_param(cn_idx, uint, 0444);
+
+#ifdef DRBD_ENABLE_FAULTS
+int enable_faults;
+int fault_rate;
+static int fault_count;
+int fault_devs;
+/* bitmap of enabled faults */
+module_param(enable_faults, int, 0664);
+/* fault rate % value - applies to all enabled faults */
+module_param(fault_rate, int, 0664);
+/* count of faults inserted */
+module_param(fault_count, int, 0664);
+/* bitmap of devices to insert faults on */
+module_param(fault_devs, int, 0644);
+#endif
+
+/* module parameter, defined */
+unsigned int minor_count = 32;
+int allow_oos;
+unsigned int cn_idx = CN_IDX_DRBD;
+
+#ifdef ENABLE_DYNAMIC_TRACE
+int trace_type; /* Bitmap of trace types to enable */
+int trace_level; /* Current trace level */
+int trace_devs; /* Bitmap of devices to trace */
+int proc_details; /* Detail level in proc drbd*/
+
+module_param(trace_level, int, 0644);
+module_param(trace_type, int, 0644);
+module_param(trace_devs, int, 0644);
+module_param(proc_details, int, 0644);
+#endif
+
+/* Module parameter for setting the user mode helper program
+ * to run. Default is /sbin/drbdadm */
+char usermode_helper[80] = "/sbin/drbdadm";
+
+module_param_string(usermode_helper, usermode_helper, sizeof(usermode_helper), 0644);
+
+/* in 2.6.x, our device mapping and config info contains our virtual gendisks
+ * as member "struct gendisk *vdisk;"
+ */
+struct drbd_conf **minor_table;
+
+struct kmem_cache *drbd_request_cache;
+struct kmem_cache *drbd_ee_cache;
+mempool_t *drbd_request_mempool;
+mempool_t *drbd_ee_mempool;
+
+/* I do not use a standard mempool, because:
+ 1) I want to hand out the preallocated objects first.
+ 2) I want to be able to interrupt sleeping allocation with a signal.
+ Note: This is a single linked list, the next pointer is the private
+ member of struct page.
+ */
+struct page *drbd_pp_pool;
+spinlock_t drbd_pp_lock;
+int drbd_pp_vacant;
+wait_queue_head_t drbd_pp_wait;
+
+DEFINE_RATELIMIT_STATE(drbd_ratelimit_state, 5 * HZ, 5);
+
+STATIC struct block_device_operations drbd_ops = {
+ .owner = THIS_MODULE,
+ .open = drbd_open,
+ .release = drbd_release,
+};
+
+#define ARRY_SIZE(A) (sizeof(A)/sizeof(A[0]))
+
+#ifdef __CHECKER__
+/* When checking with sparse, and this is an inline function, sparse will
+ give tons of false positives. When this is a real functions sparse works.
+ */
+int _inc_local_if_state(struct drbd_conf *mdev, enum drbd_disk_state mins)
+{
+ int io_allowed;
+
+ atomic_inc(&mdev->local_cnt);
+ io_allowed = (mdev->state.disk >= mins);
+ if (!io_allowed) {
+ if (atomic_dec_and_test(&mdev->local_cnt))
+ wake_up(&mdev->misc_wait);
+ }
+ return io_allowed;
+}
+
+#endif
+
+/************************* The transfer log start */
+STATIC int tl_init(struct drbd_conf *mdev)
+{
+ struct drbd_barrier *b;
+
+ b = kmalloc(sizeof(struct drbd_barrier), GFP_KERNEL);
+ if (!b)
+ return 0;
+ INIT_LIST_HEAD(&b->requests);
+ INIT_LIST_HEAD(&b->w.list);
+ b->next = NULL;
+ b->br_number = 4711;
+ b->n_req = 0;
+ b->w.cb = NULL; /* if this is != NULL, we need to dec_ap_pending in tl_clear */
+
+ mdev->oldest_barrier = b;
+ mdev->newest_barrier = b;
+ INIT_LIST_HEAD(&mdev->out_of_sequence_requests);
+
+ mdev->tl_hash = NULL;
+ mdev->tl_hash_s = 0;
+
+ return 1;
+}
+
+STATIC void tl_cleanup(struct drbd_conf *mdev)
+{
+ D_ASSERT(mdev->oldest_barrier == mdev->newest_barrier);
+ D_ASSERT(list_empty(&mdev->out_of_sequence_requests));
+ kfree(mdev->oldest_barrier);
+ mdev->oldest_barrier = NULL;
+ kfree(mdev->unused_spare_barrier);
+ mdev->unused_spare_barrier = NULL;
+ kfree(mdev->tl_hash);
+ mdev->tl_hash = NULL;
+ mdev->tl_hash_s = 0;
+}
+
+/**
+ * _tl_add_barrier: Adds a barrier to the TL.
+ */
+void _tl_add_barrier(struct drbd_conf *mdev, struct drbd_barrier *new)
+{
+ struct drbd_barrier *newest_before;
+
+ INIT_LIST_HEAD(&new->requests);
+ INIT_LIST_HEAD(&new->w.list);
+ new->w.cb = NULL; /* if this is != NULL, we need to dec_ap_pending in tl_clear */
+ new->next = NULL;
+ new->n_req = 0;
+
+ newest_before = mdev->newest_barrier;
+ /* never send a barrier number == 0, because that is special-cased
+ * when using TCQ for our write ordering code */
+ new->br_number = (newest_before->br_number+1) ?: 1;
+ if (mdev->newest_barrier != new) {
+ mdev->newest_barrier->next = new;
+ mdev->newest_barrier = new;
+ }
+}
+
+/* when we receive a barrier ack */
+void tl_release(struct drbd_conf *mdev, unsigned int barrier_nr,
+ unsigned int set_size)
+{
+ struct drbd_barrier *b, *nob; /* next old barrier */
+ struct list_head *le, *tle;
+ struct drbd_request *r;
+
+ spin_lock_irq(&mdev->req_lock);
+
+ b = mdev->oldest_barrier;
+
+ /* first some paranoia code */
+ if (b == NULL) {
+ ERR("BAD! BarrierAck #%u received, but no epoch in tl!?\n",
+ barrier_nr);
+ goto bail;
+ }
+ if (b->br_number != barrier_nr) {
+ ERR("BAD! BarrierAck #%u received, expected #%u!\n",
+ barrier_nr, b->br_number);
+ goto bail;
+ }
+ if (b->n_req != set_size) {
+ ERR("BAD! BarrierAck #%u received with n_req=%u, expected n_req=%u!\n",
+ barrier_nr, set_size, b->n_req);
+ goto bail;
+ }
+
+ /* Clean up list of requests processed during current epoch */
+ list_for_each_safe(le, tle, &b->requests) {
+ r = list_entry(le, struct drbd_request, tl_requests);
+ _req_mod(r, barrier_acked, 0);
+ }
+ /* There could be requests on the list waiting for completion
+ of the write to the local disk. To avoid corruptions of
+ slab's data structures we have to remove the lists head.
+
+ Also there could have been a barrier ack out of sequence, overtaking
+ the write acks - which would be a but and violating write ordering.
+ To not deadlock in case we lose connection while such requests are
+ still pending, we need some way to find them for the
+ _req_mode(connection_lost_while_pending).
+
+ These have been list_move'd to the out_of_sequence_requests list in
+ _req_mod(, barrier_acked,) above.
+ */
+ list_del_init(&b->requests);
+
+ nob = b->next;
+ if (test_and_clear_bit(CREATE_BARRIER, &mdev->flags)) {
+ _tl_add_barrier(mdev, b);
+ if (nob)
+ mdev->oldest_barrier = nob;
+ /* if nob == NULL b was the only barrier, and becomes the new
+ barrer. Threfore mdev->oldest_barrier points already to b */
+ } else {
+ D_ASSERT(nob != NULL);
+ mdev->oldest_barrier = nob;
+ kfree(b);
+ }
+
+ spin_unlock_irq(&mdev->req_lock);
+ dec_ap_pending(mdev);
+
+ return;
+
+bail:
+ spin_unlock_irq(&mdev->req_lock);
+ drbd_force_state(mdev, NS(conn, ProtocolError));
+}
+
+
+/* called by drbd_disconnect (exiting receiver thread)
+ * or from some after_state_ch */
+void tl_clear(struct drbd_conf *mdev)
+{
+ struct drbd_barrier *b, *tmp;
+ struct list_head *le, *tle;
+ struct drbd_request *r;
+ int new_initial_bnr = net_random();
+
+ spin_lock_irq(&mdev->req_lock);
+
+ b = mdev->oldest_barrier;
+ while (b) {
+ list_for_each_safe(le, tle, &b->requests) {
+ r = list_entry(le, struct drbd_request, tl_requests);
+ _req_mod(r, connection_lost_while_pending, 0);
+ }
+ tmp = b->next;
+
+ /* there could still be requests on that ring list,
+ * in case local io is still pending */
+ list_del(&b->requests);
+
+ /* dec_ap_pending corresponding to queue_barrier.
+ * the newest barrier may not have been queued yet,
+ * in which case w.cb is still NULL. */
+ if (b->w.cb != NULL)
+ dec_ap_pending(mdev);
+
+ if (b == mdev->newest_barrier) {
+ /* recycle, but reinit! */
+ D_ASSERT(tmp == NULL);
+ INIT_LIST_HEAD(&b->requests);
+ INIT_LIST_HEAD(&b->w.list);
+ b->w.cb = NULL;
+ b->br_number = new_initial_bnr;
+ b->n_req = 0;
+
+ mdev->oldest_barrier = b;
+ break;
+ }
+ kfree(b);
+ b = tmp;
+ }
+
+ /* we expect this list to be empty. */
+ D_ASSERT(list_empty(&mdev->out_of_sequence_requests));
+
+ /* but just in case, clean it up anyways! */
+ list_for_each_safe(le, tle, &mdev->out_of_sequence_requests) {
+ r = list_entry(le, struct drbd_request, tl_requests);
+ _req_mod(r, connection_lost_while_pending, 0);
+ }
+
+ /* ensure bit indicating barrier is required is clear */
+ clear_bit(CREATE_BARRIER, &mdev->flags);
+
+ spin_unlock_irq(&mdev->req_lock);
+}
+
+/**
+ * drbd_io_error: Handles the on_io_error setting, should be called in the
+ * unlikely(!drbd_bio_uptodate(e->bio)) case from kernel thread context.
+ * See also drbd_chk_io_error
+ *
+ * NOTE: we set ourselves FAILED here if on_io_error is Detach or Panic OR
+ * if the forcedetach flag is set. This flag is set when failures
+ * occur writing the meta data portion of the disk as they are
+ * not recoverable.
+ */
+int drbd_io_error(struct drbd_conf *mdev, int forcedetach)
+{
+ enum io_error_handler eh;
+ unsigned long flags;
+ int send;
+ int ok = 1;
+
+ eh = PassOn;
+ if (inc_local_if_state(mdev, Failed)) {
+ eh = mdev->bc->dc.on_io_error;
+ dec_local(mdev);
+ }
+
+ if (!forcedetach && eh == PassOn)
+ return 1;
+
+ spin_lock_irqsave(&mdev->req_lock, flags);
+ send = (mdev->state.disk == Failed);
+ if (send)
+ _drbd_set_state(_NS(mdev, disk, Diskless), ChgStateHard, NULL);
+ spin_unlock_irqrestore(&mdev->req_lock, flags);
+
+ if (!send)
+ return ok;
+
+ if (mdev->state.conn >= Connected) {
+ ok = drbd_send_state(mdev);
+ if (ok)
+ drbd_WARN("Notified peer that my disk is broken.\n");
+ else
+ ERR("Sending state in drbd_io_error() failed\n");
+ }
+
+ /* Make sure we try to flush meta-data to disk - we come
+ * in here because of a local disk error so it might fail
+ * but we still need to try -- both because the error might
+ * be in the data portion of the disk and because we need
+ * to ensure the md-sync-timer is stopped if running. */
+ drbd_md_sync(mdev);
+
+ /* Releasing the backing device is done in after_state_ch() */
+
+ if (eh == CallIOEHelper)
+ drbd_khelper(mdev, "local-io-error");
+
+ return ok;
+}
+
+/**
+ * cl_wide_st_chg:
+ * Returns TRUE if this state change should be preformed as a cluster wide
+ * transaction. Of course it returns 0 as soon as the connection is lost.
+ */
+STATIC int cl_wide_st_chg(struct drbd_conf *mdev,
+ union drbd_state_t os, union drbd_state_t ns)
+{
+ return (os.conn >= Connected && ns.conn >= Connected &&
+ ((os.role != Primary && ns.role == Primary) ||
+ (os.conn != StartingSyncT && ns.conn == StartingSyncT) ||
+ (os.conn != StartingSyncS && ns.conn == StartingSyncS) ||
+ (os.disk != Diskless && ns.disk == Diskless))) ||
+ (os.conn >= Connected && ns.conn == Disconnecting) ||
+ (os.conn == Connected && ns.conn == VerifyS);
+}
+
+int drbd_change_state(struct drbd_conf *mdev, enum chg_state_flags f,
+ union drbd_state_t mask, union drbd_state_t val)
+{
+ unsigned long flags;
+ union drbd_state_t os, ns;
+ int rv;
+
+ spin_lock_irqsave(&mdev->req_lock, flags);
+ os = mdev->state;
+ ns.i = (os.i & ~mask.i) | val.i;
+ rv = _drbd_set_state(mdev, ns, f, NULL);
+ ns = mdev->state;
+ spin_unlock_irqrestore(&mdev->req_lock, flags);
+
+ return rv;
+}
+
+void drbd_force_state(struct drbd_conf *mdev,
+ union drbd_state_t mask, union drbd_state_t val)
+{
+ drbd_change_state(mdev, ChgStateHard, mask, val);
+}
+
+int is_valid_state(struct drbd_conf *mdev, union drbd_state_t ns);
+int is_valid_state_transition(struct drbd_conf *,
+ union drbd_state_t, union drbd_state_t);
+int drbd_send_state_req(struct drbd_conf *,
+ union drbd_state_t, union drbd_state_t);
+
+STATIC enum set_st_err _req_st_cond(struct drbd_conf *mdev,
+ union drbd_state_t mask, union drbd_state_t val)
+{
+ union drbd_state_t os, ns;
+ unsigned long flags;
+ int rv;
+
+ if (test_and_clear_bit(CL_ST_CHG_SUCCESS, &mdev->flags))
+ return SS_CW_Success;
+
+ if (test_and_clear_bit(CL_ST_CHG_FAIL, &mdev->flags))
+ return SS_CW_FailedByPeer;
+
+ rv = 0;
+ spin_lock_irqsave(&mdev->req_lock, flags);
+ os = mdev->state;
+ ns.i = (os.i & ~mask.i) | val.i;
+ if (!cl_wide_st_chg(mdev, os, ns))
+ rv = SS_CW_NoNeed;
+ if (!rv) {
+ rv = is_valid_state(mdev, ns);
+ if (rv == SS_Success) {
+ rv = is_valid_state_transition(mdev, ns, os);
+ if (rv == SS_Success)
+ rv = 0; /* cont waiting, otherwise fail. */
+ }
+ }
+ spin_unlock_irqrestore(&mdev->req_lock, flags);
+
+ return rv;
+}
+
+/**
+ * _drbd_request_state:
+ * This function is the most gracefull way to change state. For some state
+ * transition this function even does a cluster wide transaction.
+ * It has a cousin named drbd_request_state(), which is always verbose.
+ */
+STATIC int drbd_req_state(struct drbd_conf *mdev,
+ union drbd_state_t mask, union drbd_state_t val,
+ enum chg_state_flags f)
+{
+ struct completion done;
+ unsigned long flags;
+ union drbd_state_t os, ns;
+ int rv;
+
+ init_completion(&done);
+
+ if (f & ChgSerialize)
+ mutex_lock(&mdev->state_mutex);
+
+ spin_lock_irqsave(&mdev->req_lock, flags);
+ os = mdev->state;
+ ns.i = (os.i & ~mask.i) | val.i;
+
+ if (cl_wide_st_chg(mdev, os, ns)) {
+ rv = is_valid_state(mdev, ns);
+ if (rv == SS_Success)
+ rv = is_valid_state_transition(mdev, ns, os);
+ spin_unlock_irqrestore(&mdev->req_lock, flags);
+
+ if (rv < SS_Success) {
+ if (f & ChgStateVerbose)
+ print_st_err(mdev, os, ns, rv);
+ goto abort;
+ }
+
+ drbd_state_lock(mdev);
+ if (!drbd_send_state_req(mdev, mask, val)) {
+ drbd_state_unlock(mdev);
+ rv = SS_CW_FailedByPeer;
+ if (f & ChgStateVerbose)
+ print_st_err(mdev, os, ns, rv);
+ goto abort;
+ }
+
+ wait_event(mdev->state_wait,
+ (rv = _req_st_cond(mdev, mask, val)));
+
+ if (rv < SS_Success) {
+ /* nearly dead code. */
+ drbd_state_unlock(mdev);
+ if (f & ChgStateVerbose)
+ print_st_err(mdev, os, ns, rv);
+ goto abort;
+ }
+ spin_lock_irqsave(&mdev->req_lock, flags);
+ os = mdev->state;
+ ns.i = (os.i & ~mask.i) | val.i;
+ rv = _drbd_set_state(mdev, ns, f, &done);
+ drbd_state_unlock(mdev);
+ } else {
+ rv = _drbd_set_state(mdev, ns, f, &done);
+ }
+
+ spin_unlock_irqrestore(&mdev->req_lock, flags);
+
+ if (f & ChgWaitComplete && rv == SS_Success) {
+ D_ASSERT(current != mdev->worker.task);
+ wait_for_completion(&done);
+ }
+
+abort:
+ if (f & ChgSerialize)
+ mutex_unlock(&mdev->state_mutex);
+
+ return rv;
+}
+
+/**
+ * _drbd_request_state:
+ * This function is the most gracefull way to change state. For some state
+ * transition this function even does a cluster wide transaction.
+ * It has a cousin named drbd_request_state(), which is always verbose.
+ */
+int _drbd_request_state(struct drbd_conf *mdev, union drbd_state_t mask,
+ union drbd_state_t val, enum chg_state_flags f)
+{
+ int rv;
+
+ wait_event(mdev->state_wait,
+ (rv = drbd_req_state(mdev, mask, val, f)) != SS_InTransientState);
+
+ return rv;
+}
+
+STATIC void print_st(struct drbd_conf *mdev, char *name, union drbd_state_t ns)
+{
+ ERR(" %s = { cs:%s ro:%s/%s ds:%s/%s %c%c%c%c }\n",
+ name,
+ conns_to_name(ns.conn),
+ roles_to_name(ns.role),
+ roles_to_name(ns.peer),
+ disks_to_name(ns.disk),
+ disks_to_name(ns.pdsk),
+ ns.susp ? 's' : 'r',
+ ns.aftr_isp ? 'a' : '-',
+ ns.peer_isp ? 'p' : '-',
+ ns.user_isp ? 'u' : '-'
+ );
+}
+
+void print_st_err(struct drbd_conf *mdev,
+ union drbd_state_t os, union drbd_state_t ns, int err)
+{
+ if (err == SS_InTransientState)
+ return;
+ ERR("State change failed: %s\n", set_st_err_name(err));
+ print_st(mdev, " state", os);
+ print_st(mdev, "wanted", ns);
+}
+
+
+#define peers_to_name roles_to_name
+#define pdsks_to_name disks_to_name
+
+#define susps_to_name(A) ((A) ? "1" : "0")
+#define aftr_isps_to_name(A) ((A) ? "1" : "0")
+#define peer_isps_to_name(A) ((A) ? "1" : "0")
+#define user_isps_to_name(A) ((A) ? "1" : "0")
+
+#define PSC(A) \
+ ({ if (ns.A != os.A) { \
+ pbp += sprintf(pbp, #A "( %s -> %s ) ", \
+ A##s_to_name(os.A), \
+ A##s_to_name(ns.A)); \
+ } })
+
+int is_valid_state(struct drbd_conf *mdev, union drbd_state_t ns)
+{
+ /* See drbd_state_sw_errors in drbd_strings.c */
+
+ enum fencing_policy fp;
+ int rv = SS_Success;
+
+ fp = DontCare;
+ if (inc_local(mdev)) {
+ fp = mdev->bc->dc.fencing;
+ dec_local(mdev);
+ }
+
+ if (inc_net(mdev)) {
+ if (!mdev->net_conf->two_primaries &&
+ ns.role == Primary && ns.peer == Primary)
+ rv = SS_TwoPrimaries;
+ dec_net(mdev);
+ }
+
+ if (rv <= 0)
+ /* already found a reason to abort */;
+ else if (ns.role == Secondary && mdev->open_cnt)
+ rv = SS_DeviceInUse;
+
+ else if (ns.role == Primary && ns.conn < Connected && ns.disk < UpToDate)
+ rv = SS_NoUpToDateDisk;
+
+ else if (fp >= Resource &&
+ ns.role == Primary && ns.conn < Connected && ns.pdsk >= DUnknown)
+ rv = SS_PrimaryNOP;
+
+ else if (ns.role == Primary && ns.disk <= Inconsistent && ns.pdsk <= Inconsistent)
+ rv = SS_NoUpToDateDisk;
+
+ else if (ns.conn > Connected && ns.disk < UpToDate && ns.pdsk < UpToDate)
+ rv = SS_BothInconsistent;
+
+ else if (ns.conn > Connected && (ns.disk == Diskless || ns.pdsk == Diskless))
+ rv = SS_SyncingDiskless;
+
+ else if ((ns.conn == Connected ||
+ ns.conn == WFBitMapS ||
+ ns.conn == SyncSource ||
+ ns.conn == PausedSyncS) &&
+ ns.disk == Outdated)
+ rv = SS_ConnectedOutdates;
+
+ else if ((ns.conn == VerifyS || ns.conn == VerifyT) &&
+ (mdev->sync_conf.verify_alg[0] == 0))
+ rv = SS_NoVerifyAlg;
+
+ else if ((ns.conn == VerifyS || ns.conn == VerifyT) &&
+ mdev->agreed_pro_version < 88)
+ rv = SS_NotSupported;
+
+ return rv;
+}
+
+int is_valid_state_transition(struct drbd_conf *mdev,
+ union drbd_state_t ns, union drbd_state_t os)
+{
+ int rv = SS_Success;
+
+ if ((ns.conn == StartingSyncT || ns.conn == StartingSyncS) &&
+ os.conn > Connected)
+ rv = SS_ResyncRunning;
+
+ if (ns.conn == Disconnecting && os.conn == StandAlone)
+ rv = SS_AlreadyStandAlone;
+
+ if (ns.disk > Attaching && os.disk == Diskless)
+ rv = SS_IsDiskLess;
+
+ if (ns.conn == WFConnection && os.conn < Unconnected)
+ rv = SS_NoNetConfig;
+
+ if (ns.disk == Outdated && os.disk < Outdated && os.disk != Attaching)
+ rv = SS_LowerThanOutdated;
+
+ if (ns.conn == Disconnecting && os.conn == Unconnected)
+ rv = SS_InTransientState;
+
+ if (ns.conn == os.conn && ns.conn == WFReportParams)
+ rv = SS_InTransientState;
+
+ if ((ns.conn == VerifyS || ns.conn == VerifyT) && os.conn < Connected)
+ rv = SS_NeedConnection;
+
+ if ((ns.conn == VerifyS || ns.conn == VerifyT) &&
+ ns.conn != os.conn && os.conn > Connected)
+ rv = SS_ResyncRunning;
+
+ if ((ns.conn == StartingSyncS || ns.conn == StartingSyncT) &&
+ os.conn < Connected)
+ rv = SS_NeedConnection;
+
+ return rv;
+}
+
+int __drbd_set_state(struct drbd_conf *mdev,
+ union drbd_state_t ns, enum chg_state_flags flags,
+ struct completion *done)
+{
+ union drbd_state_t os;
+ int rv = SS_Success;
+ int warn_sync_abort = 0;
+ enum fencing_policy fp;
+ struct after_state_chg_work *ascw;
+
+
+ os = mdev->state;
+
+ fp = DontCare;
+ if (inc_local(mdev)) {
+ fp = mdev->bc->dc.fencing;
+ dec_local(mdev);
+ }
+
+ /* Early state sanitising. */
+
+ /* Dissalow Network errors to configure a device's network part */
+ if ((ns.conn >= Timeout && ns.conn <= TearDown) &&
+ os.conn <= Disconnecting)
+ ns.conn = os.conn;
+
+ /* After a network error (+TearDown) only Unconnected or Disconnecting can follow */
+ if (os.conn >= Timeout && os.conn <= TearDown &&
+ ns.conn != Unconnected && ns.conn != Disconnecting)
+ ns.conn = os.conn;
+
+ /* After Disconnecting only StandAlone may follow */
+ if (os.conn == Disconnecting && ns.conn != StandAlone)
+ ns.conn = os.conn;
+
+ if (ns.conn < Connected) {
+ ns.peer_isp = 0;
+ ns.peer = Unknown;
+ if (ns.pdsk > DUnknown || ns.pdsk < Inconsistent)
+ ns.pdsk = DUnknown;
+ }
+
+ if (ns.conn <= Disconnecting && ns.disk == Diskless)
+ ns.pdsk = DUnknown;
+
+ if (os.conn > Connected && ns.conn > Connected &&
+ (ns.disk <= Failed || ns.pdsk <= Failed)) {
+ warn_sync_abort = 1;
+ ns.conn = Connected;
+ }
+
+ if (ns.conn >= Connected &&
+ ((ns.disk == Consistent || ns.disk == Outdated) ||
+ (ns.disk == Negotiating && ns.conn == WFBitMapT))) {
+ switch (ns.conn) {
+ case WFBitMapT:
+ case PausedSyncT:
+ ns.disk = Outdated;
+ break;
+ case Connected:
+ case WFBitMapS:
+ case SyncSource:
+ case PausedSyncS:
+ ns.disk = UpToDate;
+ break;
+ case SyncTarget:
+ ns.disk = Inconsistent;
+ drbd_WARN("Implicit set disk state Inconsistent!\n");
+ break;
+ }
+ if (os.disk == Outdated && ns.disk == UpToDate)
+ drbd_WARN("Implicit set disk from Outdate to UpToDate\n");
+ }
+
+ if (ns.conn >= Connected &&
+ (ns.pdsk == Consistent || ns.pdsk == Outdated)) {
+ switch (ns.conn) {
+ case Connected:
+ case WFBitMapT:
+ case PausedSyncT:
+ case SyncTarget:
+ ns.pdsk = UpToDate;
+ break;
+ case WFBitMapS:
+ case PausedSyncS:
+ ns.pdsk = Outdated;
+ break;
+ case SyncSource:
+ ns.pdsk = Inconsistent;
+ drbd_WARN("Implicit set pdsk Inconsistent!\n");
+ break;
+ }
+ if (os.pdsk == Outdated && ns.pdsk == UpToDate)
+ drbd_WARN("Implicit set pdsk from Outdate to UpToDate\n");
+ }
+
+ /* Connection breaks down before we finished "Negotiating" */
+ if (ns.conn < Connected && ns.disk == Negotiating &&
+ inc_local_if_state(mdev, Negotiating)) {
+ if (mdev->ed_uuid == mdev->bc->md.uuid[Current]) {
+ ns.disk = mdev->new_state_tmp.disk;
+ ns.pdsk = mdev->new_state_tmp.pdsk;
+ } else {
+ ALERT("Connection lost while negotiating, no data!\n");
+ ns.disk = Diskless;
+ ns.pdsk = DUnknown;
+ }
+ dec_local(mdev);
+ }
+
+ if (fp == Stonith &&
+ (ns.role == Primary &&
+ ns.conn < Connected &&
+ ns.pdsk > Outdated))
+ ns.susp = 1;
+
+ if (ns.aftr_isp || ns.peer_isp || ns.user_isp) {
+ if (ns.conn == SyncSource)
+ ns.conn = PausedSyncS;
+ if (ns.conn == SyncTarget)
+ ns.conn = PausedSyncT;
+ } else {
+ if (ns.conn == PausedSyncS)
+ ns.conn = SyncSource;
+ if (ns.conn == PausedSyncT)
+ ns.conn = SyncTarget;
+ }
+
+ if (ns.i == os.i)
+ return SS_NothingToDo;
+
+ if (!(flags & ChgStateHard)) {
+ /* pre-state-change checks ; only look at ns */
+ /* See drbd_state_sw_errors in drbd_strings.c */
+
+ rv = is_valid_state(mdev, ns);
+ if (rv < SS_Success) {
+ /* If the old state was illegal as well, then let
+ this happen...*/
+
+ if (is_valid_state(mdev, os) == rv) {
+ ERR("Considering state change from bad state. "
+ "Error would be: '%s'\n",
+ set_st_err_name(rv));
+ print_st(mdev, "old", os);
+ print_st(mdev, "new", ns);
+ rv = is_valid_state_transition(mdev, ns, os);
+ }
+ } else
+ rv = is_valid_state_transition(mdev, ns, os);
+ }
+
+ if (rv < SS_Success) {
+ if (flags & ChgStateVerbose)
+ print_st_err(mdev, os, ns, rv);
+ return rv;
+ }
+
+ if (warn_sync_abort)
+ drbd_WARN("Resync aborted.\n");
+
+ {
+ char *pbp, pb[300];
+ pbp = pb;
+ *pbp = 0;
+ PSC(role);
+ PSC(peer);
+ PSC(conn);
+ PSC(disk);
+ PSC(pdsk);
+ PSC(susp);
+ PSC(aftr_isp);
+ PSC(peer_isp);
+ PSC(user_isp);
+ INFO("%s\n", pb);
+ }
+
+ mdev->state.i = ns.i;
+ wake_up(&mdev->misc_wait);
+ wake_up(&mdev->state_wait);
+
+ /** post-state-change actions **/
+ if (os.conn >= SyncSource && ns.conn <= Connected) {
+ set_bit(STOP_SYNC_TIMER, &mdev->flags);
+ mod_timer(&mdev->resync_timer, jiffies);
+ }
+
+ if ((os.conn == PausedSyncT || os.conn == PausedSyncS) &&
+ (ns.conn == SyncTarget || ns.conn == SyncSource)) {
+ INFO("Syncer continues.\n");
+ mdev->rs_paused += (long)jiffies-(long)mdev->rs_mark_time;
+ if (ns.conn == SyncTarget) {
+ if (!test_and_clear_bit(STOP_SYNC_TIMER, &mdev->flags))
+ mod_timer(&mdev->resync_timer, jiffies);
+ /* This if (!test_bit) is only needed for the case
+ that a device that has ceased to used its timer,
+ i.e. it is already in drbd_resync_finished() gets
+ paused and resumed. */
+ }
+ }
+
+ if ((os.conn == SyncTarget || os.conn == SyncSource) &&
+ (ns.conn == PausedSyncT || ns.conn == PausedSyncS)) {
+ INFO("Resync suspended\n");
+ mdev->rs_mark_time = jiffies;
+ if (ns.conn == PausedSyncT)
+ set_bit(STOP_SYNC_TIMER, &mdev->flags);
+ }
+
+ if (os.conn == Connected &&
+ (ns.conn == VerifyS || ns.conn == VerifyT)) {
+ mdev->ov_position = 0;
+ mdev->ov_left =
+ mdev->rs_total =
+ mdev->rs_mark_left = drbd_bm_bits(mdev);
+ mdev->rs_start =
+ mdev->rs_mark_time = jiffies;
+ mdev->ov_last_oos_size = 0;
+ mdev->ov_last_oos_start = 0;
+
+ if (ns.conn == VerifyS)
+ mod_timer(&mdev->resync_timer, jiffies);
+ }
+
+ if (inc_local(mdev)) {
+ u32 mdf = mdev->bc->md.flags & ~(MDF_Consistent|MDF_PrimaryInd|
+ MDF_ConnectedInd|MDF_WasUpToDate|
+ MDF_PeerOutDated|MDF_CrashedPrimary);
+
+ if (test_bit(CRASHED_PRIMARY, &mdev->flags))
+ mdf |= MDF_CrashedPrimary;
+ if (mdev->state.role == Primary ||
+ (mdev->state.pdsk < Inconsistent && mdev->state.peer == Primary))
+ mdf |= MDF_PrimaryInd;
+ if (mdev->state.conn > WFReportParams)
+ mdf |= MDF_ConnectedInd;
+ if (mdev->state.disk > Inconsistent)
+ mdf |= MDF_Consistent;
+ if (mdev->state.disk > Outdated)
+ mdf |= MDF_WasUpToDate;
+ if (mdev->state.pdsk <= Outdated && mdev->state.pdsk >= Inconsistent)
+ mdf |= MDF_PeerOutDated;
+ if (mdf != mdev->bc->md.flags) {
+ mdev->bc->md.flags = mdf;
+ drbd_md_mark_dirty(mdev);
+ }
+ if (os.disk < Consistent && ns.disk >= Consistent)
+ drbd_set_ed_uuid(mdev, mdev->bc->md.uuid[Current]);
+ dec_local(mdev);
+ }
+
+ /* Peer was forced UpToDate & Primary, consider to resync */
+ if (os.disk == Inconsistent && os.pdsk == Inconsistent &&
+ os.peer == Secondary && ns.peer == Primary)
+ set_bit(CONSIDER_RESYNC, &mdev->flags);
+
+ /* Receiver should clean up itself */
+ if (os.conn != Disconnecting && ns.conn == Disconnecting)
+ drbd_thread_stop_nowait(&mdev->receiver);
+
+ /* Now the receiver finished cleaning up itself, it should die */
+ if (os.conn != StandAlone && ns.conn == StandAlone)
+ drbd_thread_stop_nowait(&mdev->receiver);
+
+ /* Upon network failure, we need to restart the receiver. */
+ if (os.conn > TearDown &&
+ ns.conn <= TearDown && ns.conn >= Timeout)
+ drbd_thread_restart_nowait(&mdev->receiver);
+
+ ascw = kmalloc(sizeof(*ascw), GFP_ATOMIC);
+ if (ascw) {
+ ascw->os = os;
+ ascw->ns = ns;
+ ascw->flags = flags;
+ ascw->w.cb = w_after_state_ch;
+ ascw->done = done;
+ drbd_queue_work(&mdev->data.work, &ascw->w);
+ } else {
+ drbd_WARN("Could not kmalloc an ascw\n");
+ }
+
+ return rv;
+}
+
+STATIC int w_after_state_ch(struct drbd_conf *mdev, struct drbd_work *w, int unused)
+{
+ struct after_state_chg_work *ascw;
+
+ ascw = (struct after_state_chg_work *) w;
+ after_state_ch(mdev, ascw->os, ascw->ns, ascw->flags);
+ if (ascw->flags & ChgWaitComplete) {
+ D_ASSERT(ascw->done != NULL);
+ complete(ascw->done);
+ }
+ kfree(ascw);
+
+ return 1;
+}
+
+static void abw_start_sync(struct drbd_conf *mdev, int rv)
+{
+ if (rv) {
+ ERR("Writing the bitmap failed not starting resync.\n");
+ _drbd_request_state(mdev, NS(conn, Connected), ChgStateVerbose);
+ return;
+ }
+
+ switch (mdev->state.conn) {
+ case StartingSyncT:
+ _drbd_request_state(mdev, NS(conn, WFSyncUUID), ChgStateVerbose);
+ break;
+ case StartingSyncS:
+ drbd_start_resync(mdev, SyncSource);
+ break;
+ }
+}
+
+STATIC void after_state_ch(struct drbd_conf *mdev, union drbd_state_t os,
+ union drbd_state_t ns, enum chg_state_flags flags)
+{
+ enum fencing_policy fp;
+
+ if (os.conn != Connected && ns.conn == Connected) {
+ clear_bit(CRASHED_PRIMARY, &mdev->flags);
+ if (mdev->p_uuid)
+ mdev->p_uuid[UUID_FLAGS] &= ~((u64)2);
+ }
+
+ fp = DontCare;
+ if (inc_local(mdev)) {
+ fp = mdev->bc->dc.fencing;
+ dec_local(mdev);
+ }
+
+ /* Inform userspace about the change... */
+ drbd_bcast_state(mdev, ns);
+
+ if (!(os.role == Primary && os.disk < UpToDate && os.pdsk < UpToDate) &&
+ (ns.role == Primary && ns.disk < UpToDate && ns.pdsk < UpToDate))
+ drbd_khelper(mdev, "pri-on-incon-degr");
+
+ /* Here we have the actions that are performed after a
+ state change. This function might sleep */
+
+ if (fp == Stonith && ns.susp) {
+ /* case1: The outdate peer handler is successfull:
+ * case2: The connection was established again: */
+ if ((os.pdsk > Outdated && ns.pdsk <= Outdated) ||
+ (os.conn < Connected && ns.conn >= Connected)) {
+ tl_clear(mdev);
+ spin_lock_irq(&mdev->req_lock);
+ _drbd_set_state(_NS(mdev, susp, 0), ChgStateVerbose, NULL);
+ spin_unlock_irq(&mdev->req_lock);
+ }
+ }
+ /* Do not change the order of the if above and the two below... */
+ if (os.pdsk == Diskless && ns.pdsk > Diskless) { /* attach on the peer */
+ drbd_send_uuids(mdev);
+ drbd_send_state(mdev);
+ }
+ if (os.conn != WFBitMapS && ns.conn == WFBitMapS)
+ drbd_queue_bitmap_io(mdev, &drbd_send_bitmap, NULL, "send_bitmap (WFBitMapS)");
+
+ /* Lost contact to peer's copy of the data */
+ if ((os.pdsk >= Inconsistent &&
+ os.pdsk != DUnknown &&
+ os.pdsk != Outdated)
+ && (ns.pdsk < Inconsistent ||
+ ns.pdsk == DUnknown ||
+ ns.pdsk == Outdated)) {
+ kfree(mdev->p_uuid);
+ mdev->p_uuid = NULL;
+ if (inc_local(mdev)) {
+ if ((ns.role == Primary || ns.peer == Primary) &&
+ mdev->bc->md.uuid[Bitmap] == 0 && ns.disk >= UpToDate) {
+ drbd_uuid_new_current(mdev);
+ drbd_send_uuids(mdev);
+ }
+ dec_local(mdev);
+ }
+ }
+
+ if (ns.pdsk < Inconsistent && inc_local(mdev)) {
+ if (ns.peer == Primary && mdev->bc->md.uuid[Bitmap] == 0)
+ drbd_uuid_new_current(mdev);
+
+ /* Diskless Peer becomes secondary */
+ if (os.peer == Primary && ns.peer == Secondary)
+ drbd_al_to_on_disk_bm(mdev);
+ dec_local(mdev);
+ }
+
+ /* Last part of the attaching process ... */
+ if (ns.conn >= Connected &&
+ os.disk == Attaching && ns.disk == Negotiating) {
+ kfree(mdev->p_uuid); /* We expect to receive up-to-date UUIDs soon. */
+ mdev->p_uuid = NULL; /* ...to not use the old ones in the mean time */
+ drbd_send_sizes(mdev); /* to start sync... */
+ drbd_send_uuids(mdev);
+ drbd_send_state(mdev);
+ }
+
+ /* We want to pause/continue resync, tell peer. */
+ if (ns.conn >= Connected &&
+ ((os.aftr_isp != ns.aftr_isp) ||
+ (os.user_isp != ns.user_isp)))
+ drbd_send_state(mdev);
+
+ /* In case one of the isp bits got set, suspend other devices. */
+ if ((!os.aftr_isp && !os.peer_isp && !os.user_isp) &&
+ (ns.aftr_isp || ns.peer_isp || ns.user_isp))
+ suspend_other_sg(mdev);
+
+ /* Make sure the peer gets informed about eventual state
+ changes (ISP bits) while we were in WFReportParams. */
+ if (os.conn == WFReportParams && ns.conn >= Connected)
+ drbd_send_state(mdev);
+
+ /* We are in the progress to start a full sync... */
+ if ((os.conn != StartingSyncT && ns.conn == StartingSyncT) ||
+ (os.conn != StartingSyncS && ns.conn == StartingSyncS))
+ drbd_queue_bitmap_io(mdev, &drbd_bmio_set_n_write, &abw_start_sync, "set_n_write from StartingSync");
+
+ /* We are invalidating our self... */
+ if (os.conn < Connected && ns.conn < Connected &&
+ os.disk > Inconsistent && ns.disk == Inconsistent)
+ drbd_queue_bitmap_io(mdev, &drbd_bmio_set_n_write, NULL, "set_n_write from invalidate");
+
+ if (os.disk > Diskless && ns.disk == Diskless) {
+ /* since inc_local() only works as long as disk>=Inconsistent,
+ and it is Diskless here, local_cnt can only go down, it can
+ not increase... It will reach zero */
+ wait_event(mdev->misc_wait, !atomic_read(&mdev->local_cnt));
+
+ lc_free(mdev->resync);
+ mdev->resync = NULL;
+ lc_free(mdev->act_log);
+ mdev->act_log = NULL;
+ __no_warn(local, drbd_free_bc(mdev->bc););
+ wmb(); /* see begin of drbd_nl_disk_conf() */
+ __no_warn(local, mdev->bc = NULL;);
+
+ if (mdev->md_io_tmpp)
+ __free_page(mdev->md_io_tmpp);
+ }
+
+ /* Disks got bigger while they were detached */
+ if (ns.disk > Negotiating && ns.pdsk > Negotiating &&
+ test_and_clear_bit(RESYNC_AFTER_NEG, &mdev->flags)) {
+ if (ns.conn == Connected)
+ resync_after_online_grow(mdev);
+ }
+
+ /* A resync finished or aborted, wake paused devices... */
+ if ((os.conn > Connected && ns.conn <= Connected) ||
+ (os.peer_isp && !ns.peer_isp) ||
+ (os.user_isp && !ns.user_isp))
+ resume_next_sg(mdev);
+
+ /* Upon network connection, we need to start the received */
+ if (os.conn == StandAlone && ns.conn == Unconnected)
+ drbd_thread_start(&mdev->receiver);
+
+ /* Terminate worker thread if we are unconfigured - it will be
+ restarted as needed... */
+ if (ns.disk == Diskless && ns.conn == StandAlone && ns.role == Secondary)
+ drbd_thread_stop_nowait(&mdev->worker);
+
+ drbd_md_sync(mdev);
+}
+
+
+STATIC int drbd_thread_setup(void *arg)
+{
+ struct Drbd_thread *thi = (struct Drbd_thread *) arg;
+ struct drbd_conf *mdev = thi->mdev;
+ int retval;
+
+restart:
+ retval = thi->function(thi);
+
+ spin_lock(&thi->t_lock);
+
+ /* if the receiver has been "Exiting", the last thing it did
+ * was set the conn state to "StandAlone",
+ * if now a re-connect request comes in, conn state goes Unconnected,
+ * and receiver thread will be "started".
+ * drbd_thread_start needs to set "Restarting" in that case.
+ * t_state check and assignement needs to be within the same spinlock,
+ * so either thread_start sees Exiting, and can remap to Restarting,
+ * or thread_start see None, and can proceed as normal.
+ */
+
+ if (thi->t_state == Restarting) {
+ INFO("Restarting %s\n", current->comm);
+ thi->t_state = Running;
+ spin_unlock(&thi->t_lock);
+ goto restart;
+ }
+
+ thi->task = NULL;
+ thi->t_state = None;
+ smp_mb();
+ complete(&thi->stop);
+ spin_unlock(&thi->t_lock);
+
+ INFO("Terminating %s\n", current->comm);
+
+ /* Release mod reference taken when thread was started */
+ module_put(THIS_MODULE);
+ return retval;
+}
+
+STATIC void drbd_thread_init(struct drbd_conf *mdev, struct Drbd_thread *thi,
+ int (*func) (struct Drbd_thread *))
+{
+ spin_lock_init(&thi->t_lock);
+ thi->task = NULL;
+ thi->t_state = None;
+ thi->function = func;
+ thi->mdev = mdev;
+}
+
+int drbd_thread_start(struct Drbd_thread *thi)
+{
+ struct drbd_conf *mdev = thi->mdev;
+ struct task_struct *nt;
+ const char *me =
+ thi == &mdev->receiver ? "receiver" :
+ thi == &mdev->asender ? "asender" :
+ thi == &mdev->worker ? "worker" : "NONSENSE";
+
+ spin_lock(&thi->t_lock);
+ switch (thi->t_state) {
+ case None:
+ INFO("Starting %s thread (from %s [%d])\n",
+ me, current->comm, current->pid);
+
+ /* Get ref on module for thread - this is released when thread exits */
+ if (!try_module_get(THIS_MODULE)) {
+ ERR("Failed to get module reference in drbd_thread_start\n");
+ spin_unlock(&thi->t_lock);
+ return FALSE;
+ }
+
+ D_ASSERT(thi->task == NULL);
+ thi->reset_cpu_mask = 1;
+ thi->t_state = Running;
+ spin_unlock(&thi->t_lock);
+ flush_signals(current); /* otherw. may get -ERESTARTNOINTR */
+
+ nt = kthread_create(drbd_thread_setup, (void *) thi,
+ "drbd%d_%s", mdev_to_minor(mdev), me);
+
+ if (IS_ERR(nt)) {
+ ERR("Couldn't start thread\n");
+
+ module_put(THIS_MODULE);
+ return FALSE;
+ }
+ spin_lock(&thi->t_lock);
+ thi->task = nt;
+ thi->t_state = Running;
+ spin_unlock(&thi->t_lock);
+ wake_up_process(nt);
+ break;
+ case Exiting:
+ thi->t_state = Restarting;
+ INFO("Restarting %s thread (from %s [%d])\n",
+ me, current->comm, current->pid);
+ case Running:
+ case Restarting:
+ default:
+ spin_unlock(&thi->t_lock);
+ break;
+ }
+
+ return TRUE;
+}
+
+
+void _drbd_thread_stop(struct Drbd_thread *thi, int restart, int wait)
+{
+ enum Drbd_thread_state ns = restart ? Restarting : Exiting;
+
+ spin_lock(&thi->t_lock);
+
+ if (thi->t_state == None) {
+ spin_unlock(&thi->t_lock);
+ if (restart)
+ drbd_thread_start(thi);
+ return;
+ }
+
+ if (thi->t_state != ns) {
+ if (thi->task == NULL) {
+ spin_unlock(&thi->t_lock);
+ return;
+ }
+
+ thi->t_state = ns;
+ smp_mb();
+ init_completion(&thi->stop);
+ if (thi->task != current)
+ force_sig(DRBD_SIGKILL, thi->task);
+
+ }
+
+ spin_unlock(&thi->t_lock);
+
+ if (wait) {
+ wait_for_completion(&thi->stop);
+ }
+}
+
+#ifdef CONFIG_SMP
+/**
+ * drbd_calc_cpu_mask: Generates CPU masks, sprad over all CPUs.
+ * Forces all threads of a device onto the same CPU. This is benificial for
+ * DRBD's performance. May be overwritten by user's configuration.
+ */
+cpumask_t drbd_calc_cpu_mask(struct drbd_conf *mdev)
+{
+ int sv, cpu;
+ cpumask_t av_cpu_m;
+
+ if (cpus_weight(mdev->cpu_mask))
+ return mdev->cpu_mask;
+
+ av_cpu_m = cpu_online_map;
+ sv = mdev_to_minor(mdev) % cpus_weight(av_cpu_m);
+
+ for_each_cpu_mask(cpu, av_cpu_m) {
+ if (sv-- == 0)
+ return cpumask_of_cpu(cpu);
+ }
+
+ /* some kernel versions "forget" to add the (cpumask_t) typecast
+ * to that macro, which results in "parse error before '{'" ;-> */
+ return (cpumask_t) CPU_MASK_ALL; /* Never reached. */
+}
+
+/* modifies the cpu mask of the _current_ thread,
+ * call in the "main loop" of _all_ threads.
+ * no need for any mutex, current won't die prematurely.
+ */
+void drbd_thread_current_set_cpu(struct drbd_conf *mdev)
+{
+ struct task_struct *p = current;
+ struct Drbd_thread *thi =
+ p == mdev->asender.task ? &mdev->asender :
+ p == mdev->receiver.task ? &mdev->receiver :
+ p == mdev->worker.task ? &mdev->worker :
+ NULL;
+ ERR_IF(thi == NULL)
+ return;
+ if (!thi->reset_cpu_mask)
+ return;
+ thi->reset_cpu_mask = 0;
+ /* preempt_disable();
+ Thas was a kernel that warned about a call to smp_processor_id() while preemt
+ was not disabled. It seems that this was fixed in manline. */
+ set_cpus_allowed(p, mdev->cpu_mask);
+ /* preempt_enable(); */
+}
+#endif
+
+/* the appropriate socket mutex must be held already */
+int _drbd_send_cmd(struct drbd_conf *mdev, struct socket *sock,
+ enum Drbd_Packet_Cmd cmd, struct Drbd_Header *h,
+ size_t size, unsigned msg_flags)
+{
+ int sent, ok;
+
+ ERR_IF(!h) return FALSE;
+ ERR_IF(!size) return FALSE;
+
+ h->magic = BE_DRBD_MAGIC;
+ h->command = cpu_to_be16(cmd);
+ h->length = cpu_to_be16(size-sizeof(struct Drbd_Header));
+
+ dump_packet(mdev, sock, 0, (void *)h, __FILE__, __LINE__);
+ sent = drbd_send(mdev, sock, h, size, msg_flags);
+
+ ok = (sent == size);
+ if (!ok)
+ ERR("short sent %s size=%d sent=%d\n",
+ cmdname(cmd), (int)size, sent);
+ return ok;
+}
+
+/* don't pass the socket. we may only look at it
+ * when we hold the appropriate socket mutex.
+ */
+int drbd_send_cmd(struct drbd_conf *mdev, int use_data_socket,
+ enum Drbd_Packet_Cmd cmd, struct Drbd_Header *h, size_t size)
+{
+ int ok = 0;
+ struct socket *sock;
+
+ if (use_data_socket) {
+ mutex_lock(&mdev->data.mutex);
+ sock = mdev->data.socket;
+ } else {
+ mutex_lock(&mdev->meta.mutex);
+ sock = mdev->meta.socket;
+ }
+
+ /* drbd_disconnect() could have called drbd_free_sock()
+ * while we were waiting in down()... */
+ if (likely(sock != NULL))
+ ok = _drbd_send_cmd(mdev, sock, cmd, h, size, 0);
+
+ if (use_data_socket)
+ mutex_unlock(&mdev->data.mutex);
+ else
+ mutex_unlock(&mdev->meta.mutex);
+ return ok;
+}
+
+int drbd_send_cmd2(struct drbd_conf *mdev, enum Drbd_Packet_Cmd cmd, char *data,
+ size_t size)
+{
+ struct Drbd_Header h;
+ int ok;
+
+ h.magic = BE_DRBD_MAGIC;
+ h.command = cpu_to_be16(cmd);
+ h.length = cpu_to_be16(size);
+
+ if (!drbd_get_data_sock(mdev))
+ return 0;
+
+ dump_packet(mdev, mdev->data.socket, 0, (void *)&h, __FILE__, __LINE__);
+
+ ok = (sizeof(h) ==
+ drbd_send(mdev, mdev->data.socket, &h, sizeof(h), 0));
+ ok = ok && (size ==
+ drbd_send(mdev, mdev->data.socket, data, size, 0));
+
+ drbd_put_data_sock(mdev);
+
+ return ok;
+}
+
+int drbd_send_sync_param(struct drbd_conf *mdev, struct syncer_conf *sc)
+{
+ struct Drbd_SyncParam89_Packet *p;
+ struct socket *sock;
+ int size, rv;
+ const int apv = mdev->agreed_pro_version;
+
+ size = apv <= 87 ? sizeof(struct Drbd_SyncParam_Packet)
+ : apv == 88 ? sizeof(struct Drbd_SyncParam_Packet)
+ + strlen(mdev->sync_conf.verify_alg) + 1
+ : /* 89 */ sizeof(struct Drbd_SyncParam89_Packet);
+
+ /* used from admin command context and receiver/worker context.
+ * to avoid kmalloc, grab the socket right here,
+ * then use the pre-allocated sbuf there */
+ mutex_lock(&mdev->data.mutex);
+ sock = mdev->data.socket;
+
+ if (likely(sock != NULL)) {
+ enum Drbd_Packet_Cmd cmd = apv >= 89 ? SyncParam89 : SyncParam;
+
+ p = &mdev->data.sbuf.SyncParam89;
+
+ /* initialize verify_alg and csums_alg */
+ memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX);
+
+ p->rate = cpu_to_be32(sc->rate);
+
+ if (apv >= 88)
+ strcpy(p->verify_alg, mdev->sync_conf.verify_alg);
+ if (apv >= 89)
+ strcpy(p->csums_alg, mdev->sync_conf.csums_alg);
+
+ rv = _drbd_send_cmd(mdev, sock, cmd, &p->head, size, 0);
+ } else
+ rv = 0; /* not ok */
+
+ mutex_unlock(&mdev->data.mutex);
+
+ return rv;
+}
+
+int drbd_send_protocol(struct drbd_conf *mdev)
+{
+ struct Drbd_Protocol_Packet *p;
+ int size, rv;
+
+ size = sizeof(struct Drbd_Protocol_Packet);
+
+ if (mdev->agreed_pro_version >= 87)
+ size += strlen(mdev->net_conf->integrity_alg) + 1;
+
+ p = kmalloc(size, GFP_KERNEL);
+ if (p == NULL)
+ return 0;
+
+ p->protocol = cpu_to_be32(mdev->net_conf->wire_protocol);
+ p->after_sb_0p = cpu_to_be32(mdev->net_conf->after_sb_0p);
+ p->after_sb_1p = cpu_to_be32(mdev->net_conf->after_sb_1p);
+ p->after_sb_2p = cpu_to_be32(mdev->net_conf->after_sb_2p);
+ p->want_lose = cpu_to_be32(mdev->net_conf->want_lose);
+ p->two_primaries = cpu_to_be32(mdev->net_conf->two_primaries);
+
+ if (mdev->agreed_pro_version >= 87)
+ strcpy(p->integrity_alg, mdev->net_conf->integrity_alg);
+
+ rv = drbd_send_cmd(mdev, USE_DATA_SOCKET, ReportProtocol,
+ (struct Drbd_Header *)p, size);
+ kfree(p);
+ return rv;
+}
+
+int drbd_send_uuids(struct drbd_conf *mdev)
+{
+ struct Drbd_GenCnt_Packet p;
+ int i;
+
+ u64 uuid_flags = 0;
+
+ if (!inc_local_if_state(mdev, Negotiating))
+ return 1;
+
+ for (i = Current; i < UUID_SIZE; i++)
+ p.uuid[i] = mdev->bc ? cpu_to_be64(mdev->bc->md.uuid[i]) : 0;
+
+ mdev->comm_bm_set = drbd_bm_total_weight(mdev);
+ p.uuid[UUID_SIZE] = cpu_to_be64(mdev->comm_bm_set);
+ uuid_flags |= mdev->net_conf->want_lose ? 1 : 0;
+ uuid_flags |= test_bit(CRASHED_PRIMARY, &mdev->flags) ? 2 : 0;
+ uuid_flags |= mdev->new_state_tmp.disk == Inconsistent ? 4 : 0;
+ p.uuid[UUID_FLAGS] = cpu_to_be64(uuid_flags);
+
+ dec_local(mdev);
+
+ return drbd_send_cmd(mdev, USE_DATA_SOCKET, ReportUUIDs,
+ (struct Drbd_Header *)&p, sizeof(p));
+}
+
+int drbd_send_sync_uuid(struct drbd_conf *mdev, u64 val)
+{
+ struct Drbd_SyncUUID_Packet p;
+
+ p.uuid = cpu_to_be64(val);
+
+ return drbd_send_cmd(mdev, USE_DATA_SOCKET, ReportSyncUUID,
+ (struct Drbd_Header *)&p, sizeof(p));
+}
+
+int drbd_send_sizes(struct drbd_conf *mdev)
+{
+ struct Drbd_Sizes_Packet p;
+ sector_t d_size, u_size;
+ int q_order_type;
+ int ok;
+
+ if (inc_local_if_state(mdev, Negotiating)) {
+ D_ASSERT(mdev->bc->backing_bdev);
+ d_size = drbd_get_max_capacity(mdev->bc);
+ u_size = mdev->bc->dc.disk_size;
+ q_order_type = drbd_queue_order_type(mdev);
+ p.queue_order_type = cpu_to_be32(drbd_queue_order_type(mdev));
+ dec_local(mdev);
+ } else {
+ d_size = 0;
+ u_size = 0;
+ q_order_type = QUEUE_ORDERED_NONE;
+ }
+
+ p.d_size = cpu_to_be64(d_size);
+ p.u_size = cpu_to_be64(u_size);
+ p.c_size = cpu_to_be64(drbd_get_capacity(mdev->this_bdev));
+ p.max_segment_size = cpu_to_be32(mdev->rq_queue->max_segment_size);
+ p.queue_order_type = cpu_to_be32(q_order_type);
+
+ ok = drbd_send_cmd(mdev, USE_DATA_SOCKET, ReportSizes,
+ (struct Drbd_Header *)&p, sizeof(p));
+ return ok;
+}
+
+/**
+ * drbd_send_state:
+ * Informs the peer about our state. Only call it when
+ * mdev->state.conn >= Connected (I.e. you may not call it while in
+ * WFReportParams. Though there is one valid and necessary exception,
+ * drbd_connect() calls drbd_send_state() while in it WFReportParams.
+ */
+int drbd_send_state(struct drbd_conf *mdev)
+{
+ struct socket *sock;
+ struct Drbd_State_Packet p;
+ int ok = 0;
+
+ /* Grab state lock so we wont send state if we're in the middle
+ * of a cluster wide state change on another thread */
+ drbd_state_lock(mdev);
+
+ mutex_lock(&mdev->data.mutex);
+
+ p.state = cpu_to_be32(mdev->state.i); /* Within the send mutex */
+ sock = mdev->data.socket;
+
+ if (likely(sock != NULL)) {
+ ok = _drbd_send_cmd(mdev, sock, ReportState,
+ (struct Drbd_Header *)&p, sizeof(p), 0);
+ }
+
+ mutex_unlock(&mdev->data.mutex);
+
+ drbd_state_unlock(mdev);
+ return ok;
+}
+
+int drbd_send_state_req(struct drbd_conf *mdev,
+ union drbd_state_t mask, union drbd_state_t val)
+{
+ struct Drbd_Req_State_Packet p;
+
+ p.mask = cpu_to_be32(mask.i);
+ p.val = cpu_to_be32(val.i);
+
+ return drbd_send_cmd(mdev, USE_DATA_SOCKET, StateChgRequest,
+ (struct Drbd_Header *)&p, sizeof(p));
+}
+
+int drbd_send_sr_reply(struct drbd_conf *mdev, int retcode)
+{
+ struct Drbd_RqS_Reply_Packet p;
+
+ p.retcode = cpu_to_be32(retcode);
+
+ return drbd_send_cmd(mdev, USE_META_SOCKET, StateChgReply,
+ (struct Drbd_Header *)&p, sizeof(p));
+}
+
+/* returns
+ * positive: number of payload bytes needed in this packet.
+ * zero: incompressible. */
+int fill_bitmap_rle_bytes(struct drbd_conf *mdev,
+ struct Drbd_Compressed_Bitmap_Packet *p,
+ struct bm_xfer_ctx *c)
+{
+ unsigned long plain_bits;
+ unsigned long tmp;
+ unsigned long rl;
+ void *buffer;
+ unsigned n;
+ unsigned len;
+ unsigned toggle;
+
+ /* may we use this feature? */
+ if ((mdev->sync_conf.use_rle_encoding == 0) ||
+ (mdev->agreed_pro_version < 90))
+ return 0;
+
+ if (c->bit_offset >= c->bm_bits)
+ return 0; /* nothing to do. */
+
+ /* use at most thus many bytes */
+ len = BM_PACKET_VLI_BYTES_MAX;
+ buffer = p->code;
+ /* plain bits covered in this code string */
+ plain_bits = 0;
+
+ /* p->encoding & 0x80 stores whether the first
+ * run length is set.
+ * bit offset is implicit.
+ * start with toggle == 2 to be able to tell the first iteration */
+ toggle = 2;
+
+ /* see how much plain bits we can stuff into one packet
+ * using RLE and VLI. */
+ do {
+ tmp = (toggle == 0) ? _drbd_bm_find_next_zero(mdev, c->bit_offset)
+ : _drbd_bm_find_next(mdev, c->bit_offset);
+ if (tmp == -1UL)
+ tmp = c->bm_bits;
+ rl = tmp - c->bit_offset;
+
+ if (toggle == 2) { /* first iteration */
+ if (rl == 0) {
+ /* the first checked bit was set,
+ * store start value, */
+ DCBP_set_start(p, 1);
+ /* but skip encoding of zero run length */
+ toggle = !toggle;
+ continue;
+ }
+ DCBP_set_start(p, 0);
+ }
+
+ /* paranoia: catch zero runlength.
+ * can only happen if bitmap is modified while we scan it. */
+ if (rl == 0) {
+ ERR("unexpected zero runlength while encoding bitmap "
+ "t:%u bo:%lu\n", toggle, c->bit_offset);
+ return -1;
+ }
+
+ n = vli_encode_bytes(buffer, rl, len);
+ if (n == 0) /* buffer full */
+ break;
+
+ toggle = !toggle;
+ buffer += n;
+ len -= n;
+ plain_bits += rl;
+ c->bit_offset = tmp;
+ } while (len && c->bit_offset < c->bm_bits);
+
+ len = BM_PACKET_VLI_BYTES_MAX - len;
+
+ if (plain_bits < (len << 3)) {
+ /* incompressible with this method.
+ * we need to rewind both word and bit position. */
+ c->bit_offset -= plain_bits;
+ bm_xfer_ctx_bit_to_word_offset(c);
+ c->bit_offset = c->word_offset * BITS_PER_LONG;
+ return 0;
+ }
+
+ /* RLE + VLI was able to compress it just fine.
+ * update c->word_offset. */
+ bm_xfer_ctx_bit_to_word_offset(c);
+
+ /* store pad_bits */
+ DCBP_set_pad_bits(p, 0);
+
+ return len;
+}
+
+int fill_bitmap_rle_bits(struct drbd_conf *mdev,
+ struct Drbd_Compressed_Bitmap_Packet *p,
+ struct bm_xfer_ctx *c)
+{
+ struct bitstream bs;
+ unsigned long plain_bits;
+ unsigned long tmp;
+ unsigned long rl;
+ unsigned len;
+ unsigned toggle;
+ int bits;
+
+ /* may we use this feature? */
+ if ((mdev->sync_conf.use_rle_encoding == 0) ||
+ (mdev->agreed_pro_version < 90))
+ return 0;
+
+ if (c->bit_offset >= c->bm_bits)
+ return 0; /* nothing to do. */
+
+ /* use at most thus many bytes */
+ bitstream_init(&bs, p->code, BM_PACKET_VLI_BYTES_MAX, 0);
+ memset(p->code, 0, BM_PACKET_VLI_BYTES_MAX);
+ /* plain bits covered in this code string */
+ plain_bits = 0;
+
+ /* p->encoding & 0x80 stores whether the first
+ * run length is set.
+ * bit offset is implicit.
+ * start with toggle == 2 to be able to tell the first iteration */
+ toggle = 2;
+
+ /* see how much plain bits we can stuff into one packet
+ * using RLE and VLI. */
+ do {
+ tmp = (toggle == 0) ? _drbd_bm_find_next_zero(mdev, c->bit_offset)
+ : _drbd_bm_find_next(mdev, c->bit_offset);
+ if (tmp == -1UL)
+ tmp = c->bm_bits;
+ rl = tmp - c->bit_offset;
+
+ if (toggle == 2) { /* first iteration */
+ if (rl == 0) {
+ /* the first checked bit was set,
+ * store start value, */
+ DCBP_set_start(p, 1);
+ /* but skip encoding of zero run length */
+ toggle = !toggle;
+ continue;
+ }
+ DCBP_set_start(p, 0);
+ }
+
+ /* paranoia: catch zero runlength.
+ * can only happen if bitmap is modified while we scan it. */
+ if (rl == 0) {
+ ERR("unexpected zero runlength while encoding bitmap "
+ "t:%u bo:%lu\n", toggle, c->bit_offset);
+ return -1;
+ }
+
+ bits = vli_encode_bits(&bs, rl);
+ if (bits == -ENOBUFS) /* buffer full */
+ break;
+ if (bits <= 0) {
+ ERR("error while encoding bitmap: %d\n", bits);
+ return 0;
+ }
+
+ toggle = !toggle;
+ plain_bits += rl;
+ c->bit_offset = tmp;
+ } while (c->bit_offset < c->bm_bits);
+
+ len = bs.cur.b - p->code + !!bs.cur.bit;
+
+ if (plain_bits < (len << 3)) {
+ /* incompressible with this method.
+ * we need to rewind both word and bit position. */
+ c->bit_offset -= plain_bits;
+ bm_xfer_ctx_bit_to_word_offset(c);
+ c->bit_offset = c->word_offset * BITS_PER_LONG;
+ return 0;
+ }
+
+ /* RLE + VLI was able to compress it just fine.
+ * update c->word_offset. */
+ bm_xfer_ctx_bit_to_word_offset(c);
+
+ /* store pad_bits */
+ DCBP_set_pad_bits(p, (8 - bs.cur.bit) & 0x7);
+
+ return len;
+}
+
+enum { OK, FAILED, DONE }
+send_bitmap_rle_or_plain(struct drbd_conf *mdev,
+ struct Drbd_Header *h, struct bm_xfer_ctx *c)
+{
+ struct Drbd_Compressed_Bitmap_Packet *p = (void*)h;
+ unsigned long num_words;
+ int len;
+ int ok;
+
+ if (0)
+ len = fill_bitmap_rle_bytes(mdev, p, c);
+ else
+ len = fill_bitmap_rle_bits(mdev, p, c);
+
+ if (len < 0)
+ return FAILED;
+ if (len) {
+ DCBP_set_code(p, 0 ? RLE_VLI_Bytes : RLE_VLI_BitsFibD_3_5);
+ ok = _drbd_send_cmd(mdev, mdev->data.socket, ReportCBitMap, h,
+ sizeof(*p) + len, 0);
+
+ c->packets[0]++;
+ c->bytes[0] += sizeof(*p) + len;
+
+ if (c->bit_offset >= c->bm_bits)
+ len = 0; /* DONE */
+ } else {
+ /* was not compressible.
+ * send a buffer full of plain text bits instead. */
+ num_words = min_t(size_t, BM_PACKET_WORDS, c->bm_words - c->word_offset);
+ len = num_words * sizeof(long);
+ if (len)
+ drbd_bm_get_lel(mdev, c->word_offset, num_words, (unsigned long*)h->payload);
+ ok = _drbd_send_cmd(mdev, mdev->data.socket, ReportBitMap,
+ h, sizeof(struct Drbd_Header) + len, 0);
+ c->word_offset += num_words;
+ c->bit_offset = c->word_offset * BITS_PER_LONG;
+
+ c->packets[1]++;
+ c->bytes[1] += sizeof(struct Drbd_Header) + len;
+
+ if (c->bit_offset > c->bm_bits)
+ c->bit_offset = c->bm_bits;
+ }
+ ok = ok ? ((len == 0) ? DONE : OK) : FAILED;
+
+ if (ok == DONE)
+ INFO_bm_xfer_stats(mdev, "send", c);
+ return ok;
+}
+
+/* See the comment at receive_bitmap() */
+int _drbd_send_bitmap(struct drbd_conf *mdev)
+{
+ struct bm_xfer_ctx c;
+ struct Drbd_Header *p;
+ int ret;
+
+ ERR_IF(!mdev->bitmap) return FALSE;
+
+ /* maybe we should use some per thread scratch page,
+ * and allocate that during initial device creation? */
+ p = (struct Drbd_Header *) __get_free_page(GFP_NOIO);
+ if (!p) {
+ ERR("failed to allocate one page buffer in %s\n", __func__);
+ return FALSE;
+ }
+
+ if (inc_local(mdev)) {
+ if (drbd_md_test_flag(mdev->bc, MDF_FullSync)) {
+ INFO("Writing the whole bitmap, MDF_FullSync was set.\n");
+ drbd_bm_set_all(mdev);
+ if (drbd_bm_write(mdev)) {
+ /* write_bm did fail! Leave full sync flag set in Meta Data
+ * but otherwise process as per normal - need to tell other
+ * side that a full resync is required! */
+ ERR("Failed to write bitmap to disk!\n");
+ } else {
+ drbd_md_clear_flag(mdev, MDF_FullSync);
+ drbd_md_sync(mdev);
+ }
+ }
+ dec_local(mdev);
+ }
+
+ c = (struct bm_xfer_ctx) {
+ .bm_bits = drbd_bm_bits(mdev),
+ .bm_words = drbd_bm_words(mdev),
+ };
+
+ do {
+ ret = send_bitmap_rle_or_plain(mdev, p, &c);
+ } while (ret == OK);
+
+ free_page((unsigned long) p);
+ return (ret == DONE);
+}
+
+int drbd_send_bitmap(struct drbd_conf *mdev)
+{
+ int err;
+
+ if (!drbd_get_data_sock(mdev))
+ return -1;
+ err = !_drbd_send_bitmap(mdev);
+ drbd_put_data_sock(mdev);
+ return err;
+}
+
+int drbd_send_b_ack(struct drbd_conf *mdev, u32 barrier_nr, u32 set_size)
+{
+ int ok;
+ struct Drbd_BarrierAck_Packet p;
+
+ p.barrier = barrier_nr;
+ p.set_size = cpu_to_be32(set_size);
+
+ if (mdev->state.conn < Connected)
+ return FALSE;
+ ok = drbd_send_cmd(mdev, USE_META_SOCKET, BarrierAck,
+ (struct Drbd_Header *)&p, sizeof(p));
+ return ok;
+}
+
+/**
+ * _drbd_send_ack:
+ * This helper function expects the sector and block_id parameter already
+ * in big endian!
+ */
+STATIC int _drbd_send_ack(struct drbd_conf *mdev, enum Drbd_Packet_Cmd cmd,
+ u64 sector,
+ u32 blksize,
+ u64 block_id)
+{
+ int ok;
+ struct Drbd_BlockAck_Packet p;
+
+ p.sector = sector;
+ p.block_id = block_id;
+ p.blksize = blksize;
+ p.seq_num = cpu_to_be32(atomic_add_return(1, &mdev->packet_seq));
+
+ if (!mdev->meta.socket || mdev->state.conn < Connected)
+ return FALSE;
+ ok = drbd_send_cmd(mdev, USE_META_SOCKET, cmd,
+ (struct Drbd_Header *)&p, sizeof(p));
+ return ok;
+}
+
+int drbd_send_ack_dp(struct drbd_conf *mdev, enum Drbd_Packet_Cmd cmd,
+ struct Drbd_Data_Packet *dp)
+{
+ const int header_size = sizeof(struct Drbd_Data_Packet)
+ - sizeof(struct Drbd_Header);
+ int data_size = ((struct Drbd_Header *)dp)->length - header_size;
+
+ return _drbd_send_ack(mdev, cmd, dp->sector, cpu_to_be32(data_size),
+ dp->block_id);
+}
+
+int drbd_send_ack_rp(struct drbd_conf *mdev, enum Drbd_Packet_Cmd cmd,
+ struct Drbd_BlockRequest_Packet *rp)
+{
+ return _drbd_send_ack(mdev, cmd, rp->sector, rp->blksize, rp->block_id);
+}
+
+int drbd_send_ack(struct drbd_conf *mdev,
+ enum Drbd_Packet_Cmd cmd, struct Tl_epoch_entry *e)
+{
+ return _drbd_send_ack(mdev, cmd,
+ cpu_to_be64(e->sector),
+ cpu_to_be32(e->size),
+ e->block_id);
+}
+
+/* This function misuses the block_id field to signal if the blocks
+ * are is sync or not. */
+int drbd_send_ack_ex(struct drbd_conf *mdev, enum Drbd_Packet_Cmd cmd,
+ sector_t sector, int blksize, u64 block_id)
+{
+ return _drbd_send_ack(mdev, cmd,
+ cpu_to_be64(sector),
+ cpu_to_be32(blksize),
+ cpu_to_be64(block_id));
+}
+
+int drbd_send_drequest(struct drbd_conf *mdev, int cmd,
+ sector_t sector, int size, u64 block_id)
+{
+ int ok;
+ struct Drbd_BlockRequest_Packet p;
+
+ p.sector = cpu_to_be64(sector);
+ p.block_id = block_id;
+ p.blksize = cpu_to_be32(size);
+
+ ok = drbd_send_cmd(mdev, USE_DATA_SOCKET, cmd,
+ (struct Drbd_Header *)&p, sizeof(p));
+ return ok;
+}
+
+int drbd_send_drequest_csum(struct drbd_conf *mdev,
+ sector_t sector, int size,
+ void *digest, int digest_size,
+ enum Drbd_Packet_Cmd cmd)
+{
+ int ok;
+ struct Drbd_BlockRequest_Packet p;
+
+ p.sector = cpu_to_be64(sector);
+ p.block_id = BE_DRBD_MAGIC + 0xbeef;
+ p.blksize = cpu_to_be32(size);
+
+ p.head.magic = BE_DRBD_MAGIC;
+ p.head.command = cpu_to_be16(cmd);
+ p.head.length = cpu_to_be16(sizeof(p) - sizeof(struct Drbd_Header) + digest_size);
+
+ mutex_lock(&mdev->data.mutex);
+
+ ok = (sizeof(p) == drbd_send(mdev, mdev->data.socket, &p, sizeof(p), 0));
+ ok = ok && (digest_size == drbd_send(mdev, mdev->data.socket, digest, digest_size, 0));
+
+ mutex_unlock(&mdev->data.mutex);
+
+ return ok;
+}
+
+int drbd_send_ov_request(struct drbd_conf *mdev, sector_t sector, int size)
+{
+ int ok;
+ struct Drbd_BlockRequest_Packet p;
+
+ p.sector = cpu_to_be64(sector);
+ p.block_id = BE_DRBD_MAGIC + 0xbabe;
+ p.blksize = cpu_to_be32(size);
+
+ ok = drbd_send_cmd(mdev, USE_DATA_SOCKET, OVRequest,
+ (struct Drbd_Header *)&p, sizeof(p));
+ return ok;
+}
+
+/* called on sndtimeo
+ * returns FALSE if we should retry,
+ * TRUE if we think connection is dead
+ */
+STATIC int we_should_drop_the_connection(struct drbd_conf *mdev, struct socket *sock)
+{
+ int drop_it;
+ /* long elapsed = (long)(jiffies - mdev->last_received); */
+
+ drop_it = mdev->meta.socket == sock
+ || !mdev->asender.task
+ || get_t_state(&mdev->asender) != Running
+ || mdev->state.conn < Connected;
+
+ if (drop_it)
+ return TRUE;
+
+ drop_it = !--mdev->ko_count;
+ if (!drop_it) {
+ ERR("[%s/%d] sock_sendmsg time expired, ko = %u\n",
+ current->comm, current->pid, mdev->ko_count);
+ request_ping(mdev);
+ }
+
+ return drop_it; /* && (mdev->state == Primary) */;
+}
+
+/* The idea of sendpage seems to be to put some kind of reference
+ * to the page into the skb, and to hand it over to the NIC. In
+ * this process get_page() gets called.
+ *
+ * As soon as the page was really sent over the network put_page()
+ * gets called by some part of the network layer. [ NIC driver? ]
+ *
+ * [ get_page() / put_page() increment/decrement the count. If count
+ * reaches 0 the page will be freed. ]
+ *
+ * This works nicely with pages from FSs.
+ * But this means that in protocol A we might signal IO completion too early!
+ *
+ * In order not to corrupt data during a resync we must make sure
+ * that we do not reuse our own buffer pages (EEs) to early, therefore
+ * we have the net_ee list.
+ *
+ * XFS seems to have problems, still, it submits pages with page_count == 0!
+ * As a workaround, we disable sendpage on pages
+ * with page_count == 0 or PageSlab.
+ */
+STATIC int _drbd_no_send_page(struct drbd_conf *mdev, struct page *page,
+ int offset, size_t size)
+{
+ int ret;
+ ret = drbd_send(mdev, mdev->data.socket, kmap(page) + offset, size, 0);
+ kunmap(page);
+ return ret;
+}
+
+int _drbd_send_page(struct drbd_conf *mdev, struct page *page,
+ int offset, size_t size)
+{
+ mm_segment_t oldfs = get_fs();
+ int sent, ok;
+ int len = size;
+
+ /* PARANOIA. if this ever triggers,
+ * something in the layers above us is really kaputt.
+ *one roundtrip later:
+ * doh. it triggered. so XFS _IS_ really kaputt ...
+ * oh well...
+ */
+ if ((page_count(page) < 1) || PageSlab(page)) {
+ /* e.g. XFS meta- & log-data is in slab pages, which have a
+ * page_count of 0 and/or have PageSlab() set...
+ */
+ sent = _drbd_no_send_page(mdev, page, offset, size);
+ if (likely(sent > 0))
+ len -= sent;
+ goto out;
+ }
+
+ drbd_update_congested(mdev);
+ set_fs(KERNEL_DS);
+ do {
+ sent = mdev->data.socket->ops->sendpage(mdev->data.socket, page,
+ offset, len,
+ MSG_NOSIGNAL);
+ if (sent == -EAGAIN) {
+ if (we_should_drop_the_connection(mdev,
+ mdev->data.socket))
+ break;
+ else
+ continue;
+ }
+ if (sent <= 0) {
+ drbd_WARN("%s: size=%d len=%d sent=%d\n",
+ __func__, (int)size, len, sent);
+ break;
+ }
+ len -= sent;
+ offset += sent;
+ } while (len > 0 /* THINK && mdev->cstate >= Connected*/);
+ set_fs(oldfs);
+ clear_bit(NET_CONGESTED, &mdev->flags);
+
+out:
+ ok = (len == 0);
+ if (likely(ok))
+ mdev->send_cnt += size>>9;
+ return ok;
+}
+
+static inline int _drbd_send_bio(struct drbd_conf *mdev, struct bio *bio)
+{
+ struct bio_vec *bvec;
+ int i;
+ __bio_for_each_segment(bvec, bio, i, 0) {
+ if (!_drbd_no_send_page(mdev, bvec->bv_page,
+ bvec->bv_offset, bvec->bv_len))
+ return 0;
+ }
+ return 1;
+}
+
+static inline int _drbd_send_zc_bio(struct drbd_conf *mdev, struct bio *bio)
+{
+ struct bio_vec *bvec;
+ int i;
+ __bio_for_each_segment(bvec, bio, i, 0) {
+ if (!_drbd_send_page(mdev, bvec->bv_page,
+ bvec->bv_offset, bvec->bv_len))
+ return 0;
+ }
+
+ return 1;
+}
+
+/* Used to send write requests
+ * Primary -> Peer (Data)
+ */
+int drbd_send_dblock(struct drbd_conf *mdev, struct drbd_request *req)
+{
+ int ok = 1;
+ struct Drbd_Data_Packet p;
+ unsigned int dp_flags = 0;
+ void *dgb;
+ int dgs;
+
+ if (!drbd_get_data_sock(mdev))
+ return 0;
+
+ dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_w_tfm) ?
+ crypto_hash_digestsize(mdev->integrity_w_tfm) : 0;
+
+ p.head.magic = BE_DRBD_MAGIC;
+ p.head.command = cpu_to_be16(Data);
+ p.head.length =
+ cpu_to_be16(sizeof(p) - sizeof(struct Drbd_Header) + dgs + req->size);
+
+ p.sector = cpu_to_be64(req->sector);
+ p.block_id = (unsigned long)req;
+ p.seq_num = cpu_to_be32(req->seq_num =
+ atomic_add_return(1, &mdev->packet_seq));
+ dp_flags = 0;
+
+ /* NOTE: no need to check if barriers supported here as we would
+ * not pass the test in make_request_common in that case
+ */
+ if (bio_barrier(req->master_bio))
+ dp_flags |= DP_HARDBARRIER;
+ if (bio_sync(req->master_bio))
+ dp_flags |= DP_RW_SYNC;
+ if (mdev->state.conn >= SyncSource &&
+ mdev->state.conn <= PausedSyncT)
+ dp_flags |= DP_MAY_SET_IN_SYNC;
+
+ p.dp_flags = cpu_to_be32(dp_flags);
+ dump_packet(mdev, mdev->data.socket, 0, (void *)&p, __FILE__, __LINE__);
+ set_bit(UNPLUG_REMOTE, &mdev->flags);
+ ok = (sizeof(p) ==
+ drbd_send(mdev, mdev->data.socket, &p, sizeof(p), MSG_MORE));
+ if (ok && dgs) {
+ dgb = mdev->int_dig_out;
+ drbd_csum(mdev, mdev->integrity_w_tfm, req->master_bio, dgb);
+ ok = drbd_send(mdev, mdev->data.socket, dgb, dgs, MSG_MORE);
+ }
+ if (ok) {
+ if (mdev->net_conf->wire_protocol == DRBD_PROT_A)
+ ok = _drbd_send_bio(mdev, req->master_bio);
+ else
+ ok = _drbd_send_zc_bio(mdev, req->master_bio);
+ }
+
+ drbd_put_data_sock(mdev);
+ return ok;
+}
+
+/* answer packet, used to send data back for read requests:
+ * Peer -> (diskless) Primary (DataReply)
+ * SyncSource -> SyncTarget (RSDataReply)
+ */
+int drbd_send_block(struct drbd_conf *mdev, enum Drbd_Packet_Cmd cmd,
+ struct Tl_epoch_entry *e)
+{
+ int ok;
+ struct Drbd_Data_Packet p;
+ void *dgb;
+ int dgs;
+
+ dgs = (mdev->agreed_pro_version >= 87 && mdev->integrity_w_tfm) ?
+ crypto_hash_digestsize(mdev->integrity_w_tfm) : 0;
+
+ p.head.magic = BE_DRBD_MAGIC;
+ p.head.command = cpu_to_be16(cmd);
+ p.head.length =
+ cpu_to_be16(sizeof(p) - sizeof(struct Drbd_Header) + dgs + e->size);
+
+ p.sector = cpu_to_be64(e->sector);
+ p.block_id = e->block_id;
+ /* p.seq_num = 0; No sequence numbers here.. */
+
+ /* Only called by our kernel thread.
+ * This one may be interupted by DRBD_SIG and/or DRBD_SIGKILL
+ * in response to admin command or module unload.
+ */
+ if (!drbd_get_data_sock(mdev))
+ return 0;
+
+ dump_packet(mdev, mdev->data.socket, 0, (void *)&p, __FILE__, __LINE__);
+ ok = sizeof(p) == drbd_send(mdev, mdev->data.socket, &p,
+ sizeof(p), MSG_MORE);
+ if (ok && dgs) {
+ dgb = mdev->int_dig_out;
+ drbd_csum(mdev, mdev->integrity_w_tfm, e->private_bio, dgb);
+ ok = drbd_send(mdev, mdev->data.socket, dgb, dgs, MSG_MORE);
+ }
+ if (ok)
+ ok = _drbd_send_zc_bio(mdev, e->private_bio);
+
+ drbd_put_data_sock(mdev);
+ return ok;
+}
+
+/*
+ drbd_send distinguishes two cases:
+
+ Packets sent via the data socket "sock"
+ and packets sent via the meta data socket "msock"
+
+ sock msock
+ -----------------+-------------------------+------------------------------
+ timeout conf.timeout / 2 conf.timeout / 2
+ timeout action send a ping via msock Abort communication
+ and close all sockets
+*/
+
+/*
+ * you must have down()ed the appropriate [m]sock_mutex elsewhere!
+ */
+int drbd_send(struct drbd_conf *mdev, struct socket *sock,
+ void *buf, size_t size, unsigned msg_flags)
+{
+ struct kvec iov;
+ struct msghdr msg;
+ int rv, sent = 0;
+
+ if (!sock)
+ return -1000;
+
+ /* THINK if (signal_pending) return ... ? */
+
+ iov.iov_base = buf;
+ iov.iov_len = size;
+
+ msg.msg_name = NULL;
+ msg.msg_namelen = 0;
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+ msg.msg_flags = msg_flags | MSG_NOSIGNAL;
+
+ if (sock == mdev->data.socket) {
+ mdev->ko_count = mdev->net_conf->ko_count;
+ drbd_update_congested(mdev);
+ }
+ do {
+ /* STRANGE
+ * tcp_sendmsg does _not_ use its size parameter at all ?
+ *
+ * -EAGAIN on timeout, -EINTR on signal.
+ */
+/* THINK
+ * do we need to block DRBD_SIG if sock == &meta.socket ??
+ * otherwise wake_asender() might interrupt some send_*Ack !
+ */
+ rv = kernel_sendmsg(sock, &msg, &iov, 1, size);
+ if (rv == -EAGAIN) {
+ if (we_should_drop_the_connection(mdev, sock))
+ break;
+ else
+ continue;
+ }
+ D_ASSERT(rv != 0);
+ if (rv == -EINTR) {
+ flush_signals(current);
+ rv = 0;
+ }
+ if (rv < 0)
+ break;
+ sent += rv;
+ iov.iov_base += rv;
+ iov.iov_len -= rv;
+ } while (sent < size);
+
+ if (sock == mdev->data.socket)
+ clear_bit(NET_CONGESTED, &mdev->flags);
+
+ if (rv <= 0) {
+ if (rv != -EAGAIN) {
+ ERR("%s_sendmsg returned %d\n",
+ sock == mdev->meta.socket ? "msock" : "sock",
+ rv);
+ drbd_force_state(mdev, NS(conn, BrokenPipe));
+ } else
+ drbd_force_state(mdev, NS(conn, Timeout));
+ }
+
+ return sent;
+}
+
+static int drbd_open(struct block_device *bdev, fmode_t mode)
+{
+ struct drbd_conf *mdev = bdev->bd_disk->private_data;
+ unsigned long flags;
+ int rv = 0;
+
+ spin_lock_irqsave(&mdev->req_lock, flags);
+ /* to have a stable mdev->state.role
+ * and no race with updating open_cnt */
+
+ if (mdev->state.role != Primary) {
+ if (mode & FMODE_WRITE)
+ rv = -EROFS;
+ else if (!allow_oos)
+ rv = -EMEDIUMTYPE;
+ }
+
+ if (!rv)
+ mdev->open_cnt++;
+ spin_unlock_irqrestore(&mdev->req_lock, flags);
+
+ return rv;
+}
+
+static int drbd_release(struct gendisk *gd, fmode_t mode)
+{
+ struct drbd_conf *mdev = gd->private_data;
+ mdev->open_cnt--;
+ return 0;
+}
+
+STATIC void drbd_unplug_fn(struct request_queue *q)
+{
+ struct drbd_conf *mdev = q->queuedata;
+
+ MTRACE(TraceTypeUnplug, TraceLvlSummary,
+ INFO("got unplugged ap_bio_count=%d\n",
+ atomic_read(&mdev->ap_bio_cnt));
+ );
+
+ /* unplug FIRST */
+ spin_lock_irq(q->queue_lock);
+ blk_remove_plug(q);
+ spin_unlock_irq(q->queue_lock);
+
+ /* only if connected */
+ spin_lock_irq(&mdev->req_lock);
+ if (mdev->state.pdsk >= Inconsistent && mdev->state.conn >= Connected) {
+ D_ASSERT(mdev->state.role == Primary);
+ if (test_and_clear_bit(UNPLUG_REMOTE, &mdev->flags)) {
+ /* add to the data.work queue,
+ * unless already queued.
+ * XXX this might be a good addition to drbd_queue_work
+ * anyways, to detect "double queuing" ... */
+ if (list_empty(&mdev->unplug_work.list))
+ drbd_queue_work(&mdev->data.work,
+ &mdev->unplug_work);
+ }
+ }
+ spin_unlock_irq(&mdev->req_lock);
+
+ if (mdev->state.disk >= Inconsistent)
+ drbd_kick_lo(mdev);
+}
+
+STATIC void drbd_set_defaults(struct drbd_conf *mdev)
+{
+ mdev->sync_conf.after = DRBD_AFTER_DEF;
+ mdev->sync_conf.rate = DRBD_RATE_DEF;
+ mdev->sync_conf.al_extents = DRBD_AL_EXTENTS_DEF;
+ mdev->state = (union drbd_state_t) {
+ { .role = Secondary,
+ .peer = Unknown,
+ .conn = StandAlone,
+ .disk = Diskless,
+ .pdsk = DUnknown,
+ .susp = 0
+ } };
+}
+
+void drbd_init_set_defaults(struct drbd_conf *mdev)
+{
+ /* the memset(,0,) did most of this.
+ * note: only assignments, no allocation in here */
+
+ drbd_set_defaults(mdev);
+
+ /* for now, we do NOT yet support it,
+ * even though we start some framework
+ * to eventually support barriers */
+ set_bit(NO_BARRIER_SUPP, &mdev->flags);
+
+ atomic_set(&mdev->ap_bio_cnt, 0);
+ atomic_set(&mdev->ap_pending_cnt, 0);
+ atomic_set(&mdev->rs_pending_cnt, 0);
+ atomic_set(&mdev->unacked_cnt, 0);
+ atomic_set(&mdev->local_cnt, 0);
+ atomic_set(&mdev->net_cnt, 0);
+ atomic_set(&mdev->packet_seq, 0);
+ atomic_set(&mdev->pp_in_use, 0);
+
+ mutex_init(&mdev->md_io_mutex);
+ mutex_init(&mdev->data.mutex);
+ mutex_init(&mdev->meta.mutex);
+ sema_init(&mdev->data.work.s, 0);
+ sema_init(&mdev->meta.work.s, 0);
+ mutex_init(&mdev->state_mutex);
+
+ spin_lock_init(&mdev->data.work.q_lock);
+ spin_lock_init(&mdev->meta.work.q_lock);
+
+ spin_lock_init(&mdev->al_lock);
+ spin_lock_init(&mdev->req_lock);
+ spin_lock_init(&mdev->peer_seq_lock);
+ spin_lock_init(&mdev->epoch_lock);
+
+ INIT_LIST_HEAD(&mdev->active_ee);
+ INIT_LIST_HEAD(&mdev->sync_ee);
+ INIT_LIST_HEAD(&mdev->done_ee);
+ INIT_LIST_HEAD(&mdev->read_ee);
+ INIT_LIST_HEAD(&mdev->net_ee);
+ INIT_LIST_HEAD(&mdev->resync_reads);
+ INIT_LIST_HEAD(&mdev->data.work.q);
+ INIT_LIST_HEAD(&mdev->meta.work.q);
+ INIT_LIST_HEAD(&mdev->resync_work.list);
+ INIT_LIST_HEAD(&mdev->unplug_work.list);
+ INIT_LIST_HEAD(&mdev->md_sync_work.list);
+ INIT_LIST_HEAD(&mdev->bm_io_work.w.list);
+ mdev->resync_work.cb = w_resync_inactive;
+ mdev->unplug_work.cb = w_send_write_hint;
+ mdev->md_sync_work.cb = w_md_sync;
+ mdev->bm_io_work.w.cb = w_bitmap_io;
+ init_timer(&mdev->resync_timer);
+ init_timer(&mdev->md_sync_timer);
+ mdev->resync_timer.function = resync_timer_fn;
+ mdev->resync_timer.data = (unsigned long) mdev;
+ mdev->md_sync_timer.function = md_sync_timer_fn;
+ mdev->md_sync_timer.data = (unsigned long) mdev;
+
+ init_waitqueue_head(&mdev->misc_wait);
+ init_waitqueue_head(&mdev->state_wait);
+ init_waitqueue_head(&mdev->ee_wait);
+ init_waitqueue_head(&mdev->al_wait);
+ init_waitqueue_head(&mdev->seq_wait);
+
+ drbd_thread_init(mdev, &mdev->receiver, drbdd_init);
+ drbd_thread_init(mdev, &mdev->worker, drbd_worker);
+ drbd_thread_init(mdev, &mdev->asender, drbd_asender);
+
+ mdev->agreed_pro_version = PRO_VERSION_MAX;
+ mdev->write_ordering = WO_bio_barrier;
+ mdev->resync_wenr = LC_FREE;
+}
+
+void drbd_mdev_cleanup(struct drbd_conf *mdev)
+{
+ if (mdev->receiver.t_state != None)
+ ERR("ASSERT FAILED: receiver t_state == %d expected 0.\n",
+ mdev->receiver.t_state);
+
+ /* no need to lock it, I'm the only thread alive */
+ if (atomic_read(&mdev->current_epoch->epoch_size) != 0)
+ ERR("epoch_size:%d\n", atomic_read(&mdev->current_epoch->epoch_size));
+ mdev->al_writ_cnt =
+ mdev->bm_writ_cnt =
+ mdev->read_cnt =
+ mdev->recv_cnt =
+ mdev->send_cnt =
+ mdev->writ_cnt =
+ mdev->p_size =
+ mdev->rs_start =
+ mdev->rs_total =
+ mdev->rs_failed =
+ mdev->rs_mark_left =
+ mdev->rs_mark_time = 0;
+ D_ASSERT(mdev->net_conf == NULL);
+
+ drbd_set_my_capacity(mdev, 0);
+ drbd_bm_resize(mdev, 0);
+ drbd_bm_cleanup(mdev);
+
+ drbd_free_resources(mdev);
+
+ /*
+ * currently we drbd_init_ee only on module load, so
+ * we may do drbd_release_ee only on module unload!
+ */
+ D_ASSERT(list_empty(&mdev->active_ee));
+ D_ASSERT(list_empty(&mdev->sync_ee));
+ D_ASSERT(list_empty(&mdev->done_ee));
+ D_ASSERT(list_empty(&mdev->read_ee));
+ D_ASSERT(list_empty(&mdev->net_ee));
+ D_ASSERT(list_empty(&mdev->resync_reads));
+ D_ASSERT(list_empty(&mdev->data.work.q));
+ D_ASSERT(list_empty(&mdev->meta.work.q));
+ D_ASSERT(list_empty(&mdev->resync_work.list));
+ D_ASSERT(list_empty(&mdev->unplug_work.list));
+
+}
+
+
+STATIC void drbd_destroy_mempools(void)
+{
+ struct page *page;
+
+ while (drbd_pp_pool) {
+ page = drbd_pp_pool;
+ drbd_pp_pool = (struct page *)page_private(page);
+ __free_page(page);
+ drbd_pp_vacant--;
+ }
+
+ /* D_ASSERT(atomic_read(&drbd_pp_vacant)==0); */
+
+ if (drbd_ee_mempool)
+ mempool_destroy(drbd_ee_mempool);
+ if (drbd_request_mempool)
+ mempool_destroy(drbd_request_mempool);
+ if (drbd_ee_cache)
+ kmem_cache_destroy(drbd_ee_cache);
+ if (drbd_request_cache)
+ kmem_cache_destroy(drbd_request_cache);
+
+ drbd_ee_mempool = NULL;
+ drbd_request_mempool = NULL;
+ drbd_ee_cache = NULL;
+ drbd_request_cache = NULL;
+
+ return;
+}
+
+STATIC int drbd_create_mempools(void)
+{
+ struct page *page;
+ const int number = (DRBD_MAX_SEGMENT_SIZE/PAGE_SIZE) * minor_count;
+ int i;
+
+ /* prepare our caches and mempools */
+ drbd_request_mempool = NULL;
+ drbd_ee_cache = NULL;
+ drbd_request_cache = NULL;
+ drbd_pp_pool = NULL;
+
+ /* caches */
+ drbd_request_cache = kmem_cache_create(
+ "drbd_req_cache", sizeof(struct drbd_request), 0, 0, NULL);
+ if (drbd_request_cache == NULL)
+ goto Enomem;
+
+ drbd_ee_cache = kmem_cache_create(
+ "drbd_ee_cache", sizeof(struct Tl_epoch_entry), 0, 0, NULL);
+ if (drbd_ee_cache == NULL)
+ goto Enomem;
+
+ /* mempools */
+ drbd_request_mempool = mempool_create(number,
+ mempool_alloc_slab, mempool_free_slab, drbd_request_cache);
+ if (drbd_request_mempool == NULL)
+ goto Enomem;
+
+ drbd_ee_mempool = mempool_create(number,
+ mempool_alloc_slab, mempool_free_slab, drbd_ee_cache);
+ if (drbd_request_mempool == NULL)
+ goto Enomem;
+
+ /* drbd's page pool */
+ spin_lock_init(&drbd_pp_lock);
+
+ for (i = 0; i < number; i++) {
+ page = alloc_page(GFP_HIGHUSER);
+ if (!page)
+ goto Enomem;
+ set_page_private(page, (unsigned long)drbd_pp_pool);
+ drbd_pp_pool = page;
+ }
+ drbd_pp_vacant = number;
+
+ return 0;
+
+Enomem:
+ drbd_destroy_mempools(); /* in case we allocated some */
+ return -ENOMEM;
+}
+
+STATIC int drbd_notify_sys(struct notifier_block *this, unsigned long code,
+ void *unused)
+{
+ /* just so we have it. you never know what interessting things we
+ * might want to do here some day...
+ */
+
+ return NOTIFY_DONE;
+}
+
+STATIC struct notifier_block drbd_notifier = {
+ .notifier_call = drbd_notify_sys,
+};
+
+static void drbd_release_ee_lists(struct drbd_conf *mdev)
+{
+ int rr;
+
+ rr = drbd_release_ee(mdev, &mdev->active_ee);
+ if (rr)
+ ERR("%d EEs in active list found!\n", rr);
+
+ rr = drbd_release_ee(mdev, &mdev->sync_ee);
+ if (rr)
+ ERR("%d EEs in sync list found!\n", rr);
+
+ rr = drbd_release_ee(mdev, &mdev->read_ee);
+ if (rr)
+ ERR("%d EEs in read list found!\n", rr);
+
+ rr = drbd_release_ee(mdev, &mdev->done_ee);
+ if (rr)
+ ERR("%d EEs in done list found!\n", rr);
+
+ rr = drbd_release_ee(mdev, &mdev->net_ee);
+ if (rr)
+ ERR("%d EEs in net list found!\n", rr);
+}
+
+/* caution. no locking.
+ * currently only used from module cleanup code. */
+static void drbd_delete_device(unsigned int minor)
+{
+ struct drbd_conf *mdev = minor_to_mdev(minor);
+
+ if (!mdev)
+ return;
+
+ /* paranoia asserts */
+ if (mdev->open_cnt != 0)
+ ERR("open_cnt = %d in %s:%u", mdev->open_cnt,
+ __FILE__ , __LINE__);
+
+ ERR_IF (!list_empty(&mdev->data.work.q)) {
+ struct list_head *lp;
+ list_for_each(lp, &mdev->data.work.q) {
+ DUMPP(lp);
+ }
+ };
+ /* end paranoia asserts */
+
+ del_gendisk(mdev->vdisk);
+
+ /* cleanup stuff that may have been allocated during
+ * device (re-)configuration or state changes */
+
+ if (mdev->this_bdev)
+ bdput(mdev->this_bdev);
+
+ drbd_free_resources(mdev);
+
+ drbd_release_ee_lists(mdev);
+
+ /* should be free'd on disconnect? */
+ kfree(mdev->ee_hash);
+ /*
+ mdev->ee_hash_s = 0;
+ mdev->ee_hash = NULL;
+ */
+
+ if (mdev->act_log)
+ lc_free(mdev->act_log);
+ if (mdev->resync)
+ lc_free(mdev->resync);
+
+ kfree(mdev->p_uuid);
+ /* mdev->p_uuid = NULL; */
+
+ kfree(mdev->int_dig_out);
+ kfree(mdev->int_dig_in);
+ kfree(mdev->int_dig_vv);
+
+ /* cleanup the rest that has been
+ * allocated from drbd_new_device
+ * and actually free the mdev itself */
+ drbd_free_mdev(mdev);
+}
+
+STATIC void drbd_cleanup(void)
+{
+ unsigned int i;
+
+ unregister_reboot_notifier(&drbd_notifier);
+
+ drbd_nl_cleanup();
+
+ if (minor_table) {
+ if (drbd_proc)
+ remove_proc_entry("drbd", NULL);
+ i = minor_count;
+ while (i--)
+ drbd_delete_device(i);
+ drbd_destroy_mempools();
+ }
+
+ kfree(minor_table);
+
+ unregister_blkdev(DRBD_MAJOR, "drbd");
+
+ printk(KERN_INFO "drbd: module cleanup done.\n");
+}
+
+/**
+ * drbd_congested: Returns 1<<BDI_write_congested and/or
+ * 1<<BDI_read_congested if we are congested. This interface is known
+ * to be used by pdflush.
+ */
+static int drbd_congested(void *congested_data, int bdi_bits)
+{
+ struct drbd_conf *mdev = congested_data;
+ struct request_queue *q;
+ char reason = '-';
+ int r = 0;
+
+ if (!__inc_ap_bio_cond(mdev)) {
+ /* DRBD has frozen IO */
+ r = bdi_bits;
+ reason = 'd';
+ goto out;
+ }
+
+ if (inc_local(mdev)) {
+ q = bdev_get_queue(mdev->bc->backing_bdev);
+ r = bdi_congested(&q->backing_dev_info, bdi_bits);
+ dec_local(mdev);
+ if (r) {
+ reason = 'b';
+ goto out;
+ }
+ }
+
+ if (bdi_bits & (1 << BDI_write_congested) && test_bit(NET_CONGESTED, &mdev->flags)) {
+ r = (1 << BDI_write_congested);
+ reason = 'n';
+ }
+
+out:
+ mdev->congestion_reason = reason;
+ return r;
+}
+
+struct drbd_conf *drbd_new_device(unsigned int minor)
+{
+ struct drbd_conf *mdev;
+ struct gendisk *disk;
+ struct request_queue *q;
+
+ mdev = kzalloc(sizeof(struct drbd_conf), GFP_KERNEL);
+ if (!mdev)
+ return NULL;
+
+ mdev->minor = minor;
+
+ drbd_init_set_defaults(mdev);
+
+ q = blk_alloc_queue(GFP_KERNEL);
+ if (!q)
+ goto out_no_q;
+ mdev->rq_queue = q;
+ q->queuedata = mdev;
+ q->max_segment_size = DRBD_MAX_SEGMENT_SIZE;
+
+ disk = alloc_disk(1);
+ if (!disk)
+ goto out_no_disk;
+ mdev->vdisk = disk;
+
+ set_disk_ro(disk, TRUE);
+
+ disk->queue = q;
+ disk->major = DRBD_MAJOR;
+ disk->first_minor = minor;
+ disk->fops = &drbd_ops;
+ sprintf(disk->disk_name, "drbd%d", minor);
+ disk->private_data = mdev;
+
+ mdev->this_bdev = bdget(MKDEV(DRBD_MAJOR, minor));
+ /* we have no partitions. we contain only ourselves. */
+ mdev->this_bdev->bd_contains = mdev->this_bdev;
+
+ q->backing_dev_info.congested_fn = drbd_congested;
+ q->backing_dev_info.congested_data = mdev;
+
+ blk_queue_make_request(q, drbd_make_request_26);
+ blk_queue_bounce_limit(q, BLK_BOUNCE_ANY);
+ blk_queue_merge_bvec(q, drbd_merge_bvec);
+ q->queue_lock = &mdev->req_lock; /* needed since we use */
+ /* plugging on a queue, that actually has no requests! */
+ q->unplug_fn = drbd_unplug_fn;
+
+ mdev->md_io_page = alloc_page(GFP_KERNEL);
+ if (!mdev->md_io_page)
+ goto out_no_io_page;
+
+ if (drbd_bm_init(mdev))
+ goto out_no_bitmap;
+ /* no need to lock access, we are still initializing the module. */
+ if (!tl_init(mdev))
+ goto out_no_tl;
+
+ mdev->app_reads_hash = kzalloc(APP_R_HSIZE*sizeof(void *), GFP_KERNEL);
+ if (!mdev->app_reads_hash)
+ goto out_no_app_reads;
+
+ mdev->current_epoch = kzalloc(sizeof(struct drbd_epoch), GFP_KERNEL);
+ if (!mdev->current_epoch)
+ goto out_no_epoch;
+
+ INIT_LIST_HEAD(&mdev->current_epoch->list);
+ mdev->epochs = 1;
+
+ return mdev;
+
+/* out_whatever_else:
+ kfree(mdev->current_epoch); */
+out_no_epoch:
+ kfree(mdev->app_reads_hash);
+out_no_app_reads:
+ tl_cleanup(mdev);
+out_no_tl:
+ drbd_bm_cleanup(mdev);
+out_no_bitmap:
+ __free_page(mdev->md_io_page);
+out_no_io_page:
+ put_disk(disk);
+out_no_disk:
+ blk_cleanup_queue(q);
+out_no_q:
+ kfree(mdev);
+ return NULL;
+}
+
+/* counterpart of drbd_new_device.
+ * last part of drbd_delete_device. */
+void drbd_free_mdev(struct drbd_conf *mdev)
+{
+ kfree(mdev->current_epoch);
+ kfree(mdev->app_reads_hash);
+ tl_cleanup(mdev);
+ if (mdev->bitmap) /* should no longer be there. */
+ drbd_bm_cleanup(mdev);
+ __free_page(mdev->md_io_page);
+ put_disk(mdev->vdisk);
+ blk_cleanup_queue(mdev->rq_queue);
+ kfree(mdev);
+}
+
+
+int __init drbd_init(void)
+{
+ int err;
+
+ if (sizeof(struct Drbd_HandShake_Packet) != 80) {
+ printk(KERN_ERR
+ "drbd: never change the size or layout "
+ "of the HandShake packet.\n");
+ return -EINVAL;
+ }
+
+ if (1 > minor_count || minor_count > 255) {
+ printk(KERN_ERR
+ "drbd: invalid minor_count (%d)\n", minor_count);
+#ifdef MODULE
+ return -EINVAL;
+#else
+ minor_count = 8;
+#endif
+ }
+
+ err = drbd_nl_init();
+ if (err)
+ return err;
+
+ err = register_blkdev(DRBD_MAJOR, "drbd");
+ if (err) {
+ printk(KERN_ERR
+ "drbd: unable to register block device major %d\n",
+ DRBD_MAJOR);
+ return err;
+ }
+
+ register_reboot_notifier(&drbd_notifier);
+
+ /*
+ * allocate all necessary structs
+ */
+ err = -ENOMEM;
+
+ init_waitqueue_head(&drbd_pp_wait);
+
+ drbd_proc = NULL; /* play safe for drbd_cleanup */
+ minor_table = kzalloc(sizeof(struct drbd_conf *)*minor_count,
+ GFP_KERNEL);
+ if (!minor_table)
+ goto Enomem;
+
+ err = drbd_create_mempools();
+ if (err)
+ goto Enomem;
+
+ drbd_proc = proc_create("drbd", S_IFREG | S_IRUGO , NULL, &drbd_proc_fops);
+ if (!drbd_proc) {
+ printk(KERN_ERR "drbd: unable to register proc file\n");
+ goto Enomem;
+ }
+
+ rwlock_init(&global_state_lock);
+
+ printk(KERN_INFO "drbd: initialised. "
+ "Version: " REL_VERSION " (api:%d/proto:%d-%d)\n",
+ API_VERSION, PRO_VERSION_MIN, PRO_VERSION_MAX);
+ printk(KERN_INFO "drbd: %s\n", drbd_buildtag());
+ printk(KERN_INFO "drbd: registered as block device major %d\n",
+ DRBD_MAJOR);
+ printk(KERN_INFO "drbd: minor_table @ 0x%p\n", minor_table);
+
+ return 0; /* Success! */
+
+Enomem:
+ drbd_cleanup();
+ if (err == -ENOMEM)
+ /* currently always the case */
+ printk(KERN_ERR "drbd: ran out of memory\n");
+ else
+ printk(KERN_ERR "drbd: initialization failure\n");
+ return err;
+}
+
+void drbd_free_bc(struct drbd_backing_dev *bc)
+{
+ if (bc == NULL)
+ return;
+
+ bd_release(bc->backing_bdev);
+ bd_release(bc->md_bdev);
+
+ fput(bc->lo_file);
+ fput(bc->md_file);
+
+ kfree(bc);
+}
+
+void drbd_free_sock(struct drbd_conf *mdev)
+{
+ if (mdev->data.socket) {
+ sock_release(mdev->data.socket);
+ mdev->data.socket = NULL;
+ }
+ if (mdev->meta.socket) {
+ sock_release(mdev->meta.socket);
+ mdev->meta.socket = NULL;
+ }
+}
+
+
+void drbd_free_resources(struct drbd_conf *mdev)
+{
+ crypto_free_hash(mdev->csums_tfm);
+ mdev->csums_tfm = NULL;
+ crypto_free_hash(mdev->verify_tfm);
+ mdev->verify_tfm = NULL;
+ crypto_free_hash(mdev->cram_hmac_tfm);
+ mdev->cram_hmac_tfm = NULL;
+ crypto_free_hash(mdev->integrity_w_tfm);
+ mdev->integrity_w_tfm = NULL;
+ crypto_free_hash(mdev->integrity_r_tfm);
+ mdev->integrity_r_tfm = NULL;
+
+ drbd_free_sock(mdev);
+
+ __no_warn(local,
+ drbd_free_bc(mdev->bc);
+ mdev->bc = NULL;);
+}
+
+/*********************************/
+/* meta data management */
+
+struct meta_data_on_disk {
+ u64 la_size; /* last agreed size. */
+ u64 uuid[UUID_SIZE]; /* UUIDs. */
+ u64 device_uuid;
+ u64 reserved_u64_1;
+ u32 flags; /* MDF */
+ u32 magic;
+ u32 md_size_sect;
+ u32 al_offset; /* offset to this block */
+ u32 al_nr_extents; /* important for restoring the AL */
+ /* `-- act_log->nr_elements <-- sync_conf.al_extents */
+ u32 bm_offset; /* offset to the bitmap, from here */
+ u32 bm_bytes_per_bit; /* BM_BLOCK_SIZE */
+ u32 reserved_u32[4];
+
+} __attribute((packed));
+
+/**
+ * drbd_md_sync:
+ * Writes the meta data super block if the MD_DIRTY flag bit is set.
+ */
+void drbd_md_sync(struct drbd_conf *mdev)
+{
+ struct meta_data_on_disk *buffer;
+ sector_t sector;
+ int i;
+
+ if (!test_and_clear_bit(MD_DIRTY, &mdev->flags))
+ return;
+ del_timer(&mdev->md_sync_timer);
+
+ /* We use here Failed and not Attaching because we try to write
+ * metadata even if we detach due to a disk failure! */
+ if (!inc_local_if_state(mdev, Failed))
+ return;
+
+ MTRACE(TraceTypeMDIO, TraceLvlSummary,
+ INFO("Writing meta data super block now.\n");
+ );
+
+ mutex_lock(&mdev->md_io_mutex);
+ buffer = (struct meta_data_on_disk *)page_address(mdev->md_io_page);
+ memset(buffer, 0, 512);
+
+ buffer->la_size = cpu_to_be64(drbd_get_capacity(mdev->this_bdev));
+ for (i = Current; i < UUID_SIZE; i++)
+ buffer->uuid[i] = cpu_to_be64(mdev->bc->md.uuid[i]);
+ buffer->flags = cpu_to_be32(mdev->bc->md.flags);
+ buffer->magic = cpu_to_be32(DRBD_MD_MAGIC);
+
+ buffer->md_size_sect = cpu_to_be32(mdev->bc->md.md_size_sect);
+ buffer->al_offset = cpu_to_be32(mdev->bc->md.al_offset);
+ buffer->al_nr_extents = cpu_to_be32(mdev->act_log->nr_elements);
+ buffer->bm_bytes_per_bit = cpu_to_be32(BM_BLOCK_SIZE);
+ buffer->device_uuid = cpu_to_be64(mdev->bc->md.device_uuid);
+
+ buffer->bm_offset = cpu_to_be32(mdev->bc->md.bm_offset);
+
+ D_ASSERT(drbd_md_ss__(mdev, mdev->bc) == mdev->bc->md.md_offset);
+ sector = mdev->bc->md.md_offset;
+
+ if (drbd_md_sync_page_io(mdev, mdev->bc, sector, WRITE)) {
+ clear_bit(MD_DIRTY, &mdev->flags);
+ } else {
+ /* this was a try anyways ... */
+ ERR("meta data update failed!\n");
+
+ drbd_chk_io_error(mdev, 1, TRUE);
+ drbd_io_error(mdev, TRUE);
+ }
+
+ /* Update mdev->bc->md.la_size_sect,
+ * since we updated it on metadata. */
+ mdev->bc->md.la_size_sect = drbd_get_capacity(mdev->this_bdev);
+
+ mutex_unlock(&mdev->md_io_mutex);
+ dec_local(mdev);
+}
+
+/**
+ * drbd_md_read:
+ * @bdev: describes the backing storage and the meta-data storage
+ * Reads the meta data from bdev. Return 0 (NoError) on success, and an
+ * enum ret_codes in case something goes wrong.
+ * Currently only: MDIOError, MDInvalid.
+ */
+int drbd_md_read(struct drbd_conf *mdev, struct drbd_backing_dev *bdev)
+{
+ struct meta_data_on_disk *buffer;
+ int i, rv = NoError;
+
+ if (!inc_local_if_state(mdev, Attaching))
+ return MDIOError;
+
+ mutex_lock(&mdev->md_io_mutex);
+ buffer = (struct meta_data_on_disk *)page_address(mdev->md_io_page);
+
+ if (!drbd_md_sync_page_io(mdev, bdev, bdev->md.md_offset, READ)) {
+ /* NOTE: cant do normal error processing here as this is
+ called BEFORE disk is attached */
+ ERR("Error while reading metadata.\n");
+ rv = MDIOError;
+ goto err;
+ }
+
+ if (be32_to_cpu(buffer->magic) != DRBD_MD_MAGIC) {
+ ERR("Error while reading metadata, magic not found.\n");
+ rv = MDInvalid;
+ goto err;
+ }
+ if (be32_to_cpu(buffer->al_offset) != bdev->md.al_offset) {
+ ERR("unexpected al_offset: %d (expected %d)\n",
+ be32_to_cpu(buffer->al_offset), bdev->md.al_offset);
+ rv = MDInvalid;
+ goto err;
+ }
+ if (be32_to_cpu(buffer->bm_offset) != bdev->md.bm_offset) {
+ ERR("unexpected bm_offset: %d (expected %d)\n",
+ be32_to_cpu(buffer->bm_offset), bdev->md.bm_offset);
+ rv = MDInvalid;
+ goto err;
+ }
+ if (be32_to_cpu(buffer->md_size_sect) != bdev->md.md_size_sect) {
+ ERR("unexpected md_size: %u (expected %u)\n",
+ be32_to_cpu(buffer->md_size_sect), bdev->md.md_size_sect);
+ rv = MDInvalid;
+ goto err;
+ }
+
+ if (be32_to_cpu(buffer->bm_bytes_per_bit) != BM_BLOCK_SIZE) {
+ ERR("unexpected bm_bytes_per_bit: %u (expected %u)\n",
+ be32_to_cpu(buffer->bm_bytes_per_bit), BM_BLOCK_SIZE);
+ rv = MDInvalid;
+ goto err;
+ }
+
+ bdev->md.la_size_sect = be64_to_cpu(buffer->la_size);
+ for (i = Current; i < UUID_SIZE; i++)
+ bdev->md.uuid[i] = be64_to_cpu(buffer->uuid[i]);
+ bdev->md.flags = be32_to_cpu(buffer->flags);
+ mdev->sync_conf.al_extents = be32_to_cpu(buffer->al_nr_extents);
+ bdev->md.device_uuid = be64_to_cpu(buffer->device_uuid);
+
+ if (mdev->sync_conf.al_extents < 7)
+ mdev->sync_conf.al_extents = 127;
+
+ err:
+ mutex_unlock(&mdev->md_io_mutex);
+ dec_local(mdev);
+
+ return rv;
+}
+
+/**
+ * drbd_md_mark_dirty:
+ * Call this function if you change enything that should be written to
+ * the meta-data super block. This function sets MD_DIRTY, and starts a
+ * timer that ensures that within five seconds you have to call drbd_md_sync().
+ */
+void drbd_md_mark_dirty(struct drbd_conf *mdev)
+{
+ set_bit(MD_DIRTY, &mdev->flags);
+ mod_timer(&mdev->md_sync_timer, jiffies + 5*HZ);
+}
+
+
+STATIC void drbd_uuid_move_history(struct drbd_conf *mdev) __must_hold(local)
+{
+ int i;
+
+ for (i = History_start; i < History_end; i++) {
+ mdev->bc->md.uuid[i+1] = mdev->bc->md.uuid[i];
+
+ MTRACE(TraceTypeUuid, TraceLvlAll,
+ drbd_print_uuid(mdev, i+1);
+ );
+ }
+}
+
+void _drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local)
+{
+ if (idx == Current) {
+ if (mdev->state.role == Primary)
+ val |= 1;
+ else
+ val &= ~((u64)1);
+
+ drbd_set_ed_uuid(mdev, val);
+ }
+
+ mdev->bc->md.uuid[idx] = val;
+
+ MTRACE(TraceTypeUuid, TraceLvlSummary,
+ drbd_print_uuid(mdev, idx);
+ );
+
+ drbd_md_mark_dirty(mdev);
+}
+
+
+void drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local)
+{
+ if (mdev->bc->md.uuid[idx]) {
+ drbd_uuid_move_history(mdev);
+ mdev->bc->md.uuid[History_start] = mdev->bc->md.uuid[idx];
+ MTRACE(TraceTypeUuid, TraceLvlMetrics,
+ drbd_print_uuid(mdev, History_start);
+ );
+ }
+ _drbd_uuid_set(mdev, idx, val);
+}
+
+/**
+ * drbd_uuid_new_current:
+ * Creates a new current UUID, and rotates the old current UUID into
+ * the bitmap slot. Causes an incremental resync upon next connect.
+ */
+void drbd_uuid_new_current(struct drbd_conf *mdev) __must_hold(local)
+{
+ u64 val;
+
+ INFO("Creating new current UUID\n");
+ D_ASSERT(mdev->bc->md.uuid[Bitmap] == 0);
+ mdev->bc->md.uuid[Bitmap] = mdev->bc->md.uuid[Current];
+ MTRACE(TraceTypeUuid, TraceLvlMetrics,
+ drbd_print_uuid(mdev, Bitmap);
+ );
+
+ get_random_bytes(&val, sizeof(u64));
+ _drbd_uuid_set(mdev, Current, val);
+}
+
+void drbd_uuid_set_bm(struct drbd_conf *mdev, u64 val) __must_hold(local)
+{
+ if (mdev->bc->md.uuid[Bitmap] == 0 && val == 0)
+ return;
+
+ if (val == 0) {
+ drbd_uuid_move_history(mdev);
+ mdev->bc->md.uuid[History_start] = mdev->bc->md.uuid[Bitmap];
+ mdev->bc->md.uuid[Bitmap] = 0;
+
+ MTRACE(TraceTypeUuid, TraceLvlMetrics,
+ drbd_print_uuid(mdev, History_start);
+ drbd_print_uuid(mdev, Bitmap);
+ );
+ } else {
+ if (mdev->bc->md.uuid[Bitmap])
+ drbd_WARN("bm UUID already set");
+
+ mdev->bc->md.uuid[Bitmap] = val;
+ mdev->bc->md.uuid[Bitmap] &= ~((u64)1);
+
+ MTRACE(TraceTypeUuid, TraceLvlMetrics,
+ drbd_print_uuid(mdev, Bitmap);
+ );
+ }
+ drbd_md_mark_dirty(mdev);
+}
+
+/**
+ * drbd_bmio_set_n_write:
+ * Is an io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io() that sets
+ * all bits in the bitmap and writes the whole bitmap to stable storage.
+ */
+int drbd_bmio_set_n_write(struct drbd_conf *mdev)
+{
+ int rv = -EIO;
+
+ if (inc_local_if_state(mdev, Attaching)) {
+ drbd_md_set_flag(mdev, MDF_FullSync);
+ drbd_md_sync(mdev);
+ drbd_bm_set_all(mdev);
+
+ rv = drbd_bm_write(mdev);
+
+ if (!rv) {
+ drbd_md_clear_flag(mdev, MDF_FullSync);
+ drbd_md_sync(mdev);
+ }
+
+ dec_local(mdev);
+ }
+
+ return rv;
+}
+
+/**
+ * drbd_bmio_clear_n_write:
+ * Is an io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io() that clears
+ * all bits in the bitmap and writes the whole bitmap to stable storage.
+ */
+int drbd_bmio_clear_n_write(struct drbd_conf *mdev)
+{
+ int rv = -EIO;
+
+ if (inc_local_if_state(mdev, Attaching)) {
+ drbd_bm_clear_all(mdev);
+ rv = drbd_bm_write(mdev);
+ dec_local(mdev);
+ }
+
+ return rv;
+}
+
+STATIC int w_bitmap_io(struct drbd_conf *mdev, struct drbd_work *w, int unused)
+{
+ struct bm_io_work *work = (struct bm_io_work *)w;
+ int rv;
+
+ D_ASSERT(atomic_read(&mdev->ap_bio_cnt) == 0);
+
+ drbd_bm_lock(mdev, work->why);
+ rv = work->io_fn(mdev);
+ drbd_bm_unlock(mdev);
+
+ clear_bit(BITMAP_IO, &mdev->flags);
+ wake_up(&mdev->misc_wait);
+
+ if (work->done)
+ work->done(mdev, rv);
+
+ clear_bit(BITMAP_IO_QUEUED, &mdev->flags);
+ work->why = NULL;
+
+ return 1;
+}
+
+/**
+ * drbd_queue_bitmap_io:
+ * Queues an IO operation on the whole bitmap.
+ * While IO on the bitmap happens we freeze appliation IO thus we ensure
+ * that drbd_set_out_of_sync() can not be called.
+ * This function MUST ONLY be called from worker context.
+ * BAD API ALERT!
+ * It MUST NOT be used while a previous such work is still pending!
+ */
+void drbd_queue_bitmap_io(struct drbd_conf *mdev,
+ int (*io_fn)(struct drbd_conf *),
+ void (*done)(struct drbd_conf *, int),
+ char *why)
+{
+ D_ASSERT(current == mdev->worker.task);
+
+ D_ASSERT(!test_bit(BITMAP_IO_QUEUED, &mdev->flags));
+ D_ASSERT(!test_bit(BITMAP_IO, &mdev->flags));
+ D_ASSERT(list_empty(&mdev->bm_io_work.w.list));
+ if (mdev->bm_io_work.why)
+ ERR("FIXME going to queue '%s' but '%s' still pending?\n",
+ why, mdev->bm_io_work.why);
+
+ mdev->bm_io_work.io_fn = io_fn;
+ mdev->bm_io_work.done = done;
+ mdev->bm_io_work.why = why;
+
+ set_bit(BITMAP_IO, &mdev->flags);
+ if (atomic_read(&mdev->ap_bio_cnt) == 0) {
+ if (list_empty(&mdev->bm_io_work.w.list)) {
+ set_bit(BITMAP_IO_QUEUED, &mdev->flags);
+ drbd_queue_work(&mdev->data.work, &mdev->bm_io_work.w);
+ } else
+ ERR("FIXME avoided double queuing bm_io_work\n");
+ }
+}
+
+/**
+ * drbd_bitmap_io:
+ * Does an IO operation on the bitmap, freezing application IO while that
+ * IO operations runs. This functions MUST NOT be called from worker context.
+ */
+int drbd_bitmap_io(struct drbd_conf *mdev, int (*io_fn)(struct drbd_conf *), char *why)
+{
+ int rv;
+
+ D_ASSERT(current != mdev->worker.task);
+
+ drbd_suspend_io(mdev);
+
+ drbd_bm_lock(mdev, why);
+ rv = io_fn(mdev);
+ drbd_bm_unlock(mdev);
+
+ drbd_resume_io(mdev);
+
+ return rv;
+}
+
+void drbd_md_set_flag(struct drbd_conf *mdev, int flag) __must_hold(local)
+{
+ if ((mdev->bc->md.flags & flag) != flag) {
+ drbd_md_mark_dirty(mdev);
+ mdev->bc->md.flags |= flag;
+ }
+}
+
+void drbd_md_clear_flag(struct drbd_conf *mdev, int flag) __must_hold(local)
+{
+ if ((mdev->bc->md.flags & flag) != 0) {
+ drbd_md_mark_dirty(mdev);
+ mdev->bc->md.flags &= ~flag;
+ }
+}
+int drbd_md_test_flag(struct drbd_backing_dev *bdev, int flag)
+{
+ return (bdev->md.flags & flag) != 0;
+}
+
+STATIC void md_sync_timer_fn(unsigned long data)
+{
+ struct drbd_conf *mdev = (struct drbd_conf *) data;
+
+ drbd_queue_work_front(&mdev->data.work, &mdev->md_sync_work);
+}
+
+STATIC int w_md_sync(struct drbd_conf *mdev, struct drbd_work *w, int unused)
+{
+ drbd_WARN("md_sync_timer expired! Worker calls drbd_md_sync().\n");
+ drbd_md_sync(mdev);
+
+ return 1;
+}
+
+#ifdef DRBD_ENABLE_FAULTS
+/* Fault insertion support including random number generator shamelessly
+ * stolen from kernel/rcutorture.c */
+struct fault_random_state {
+ unsigned long state;
+ unsigned long count;
+};
+
+#define FAULT_RANDOM_MULT 39916801 /* prime */
+#define FAULT_RANDOM_ADD 479001701 /* prime */
+#define FAULT_RANDOM_REFRESH 10000
+
+/*
+ * Crude but fast random-number generator. Uses a linear congruential
+ * generator, with occasional help from get_random_bytes().
+ */
+STATIC unsigned long
+_drbd_fault_random(struct fault_random_state *rsp)
+{
+ long refresh;
+
+ if (--rsp->count < 0) {
+ get_random_bytes(&refresh, sizeof(refresh));
+ rsp->state += refresh;
+ rsp->count = FAULT_RANDOM_REFRESH;
+ }
+ rsp->state = rsp->state * FAULT_RANDOM_MULT + FAULT_RANDOM_ADD;
+ return swahw32(rsp->state);
+}
+
+STATIC char *
+_drbd_fault_str(unsigned int type) {
+ static char *_faults[] = {
+ "Meta-data write",
+ "Meta-data read",
+ "Resync write",
+ "Resync read",
+ "Data write",
+ "Data read",
+ "Data read ahead",
+ };
+
+ return (type < DRBD_FAULT_MAX) ? _faults[type] : "**Unknown**";
+}
+
+unsigned int
+_drbd_insert_fault(struct drbd_conf *mdev, unsigned int type)
+{
+ static struct fault_random_state rrs = {0, 0};
+
+ unsigned int ret = (
+ (fault_devs == 0 ||
+ ((1 << mdev_to_minor(mdev)) & fault_devs) != 0) &&
+ (((_drbd_fault_random(&rrs) % 100) + 1) <= fault_rate));
+
+ if (ret) {
+ fault_count++;
+
+ if (printk_ratelimit())
+ drbd_WARN("***Simulating %s failure\n",
+ _drbd_fault_str(type));
+ }
+
+ return ret;
+}
+#endif
+
+#ifdef ENABLE_DYNAMIC_TRACE
+
+STATIC char *_drbd_uuid_str(unsigned int idx)
+{
+ static char *uuid_str[] = {
+ "Current",
+ "Bitmap",
+ "History_start",
+ "History_end",
+ "UUID_SIZE",
+ "UUID_FLAGS",
+ };
+
+ return (idx < EXT_UUID_SIZE) ? uuid_str[idx] : "*Unknown UUID index*";
+}
+
+/* Pretty print a UUID value */
+void drbd_print_uuid(struct drbd_conf *mdev, unsigned int idx) __must_hold(local)
+{
+ INFO(" uuid[%s] now %016llX\n",
+ _drbd_uuid_str(idx), (unsigned long long)mdev->bc->md.uuid[idx]);
+}
+
+
+/*
+ *
+ * drbd_print_buffer
+ *
+ * This routine dumps binary data to the debugging output. Can be
+ * called at interrupt level.
+ *
+ * Arguments:
+ *
+ * prefix - String is output at the beginning of each line output
+ * flags - Control operation of the routine. Currently defined
+ * Flags are:
+ * DBGPRINT_BUFFADDR; if set, each line starts with the
+ * virtual address of the line being outupt. If clear,
+ * each line starts with the offset from the beginning
+ * of the buffer.
+ * size - Indicates the size of each entry in the buffer. Supported
+ * values are sizeof(char), sizeof(short) and sizeof(int)
+ * buffer - Start address of buffer
+ * buffer_va - Virtual address of start of buffer (normally the same
+ * as Buffer, but having it separate allows it to hold
+ * file address for example)
+ * length - length of buffer
+ *
+ */
+void
+drbd_print_buffer(const char *prefix, unsigned int flags, int size,
+ const void *buffer, const void *buffer_va,
+ unsigned int length)
+
+#define LINE_SIZE 16
+#define LINE_ENTRIES (int)(LINE_SIZE/size)
+{
+ const unsigned char *pstart;
+ const unsigned char *pstart_va;
+ const unsigned char *pend;
+ char bytes_str[LINE_SIZE*3+8], ascii_str[LINE_SIZE+8];
+ char *pbytes = bytes_str, *pascii = ascii_str;
+ int offset = 0;
+ long sizemask;
+ int field_width;
+ int index;
+ const unsigned char *pend_str;
+ const unsigned char *p;
+ int count;
+
+ /* verify size parameter */
+ if (size != sizeof(char) &&
+ size != sizeof(short) &&
+ size != sizeof(int)) {
+ printk(KERN_DEBUG "drbd_print_buffer: "
+ "ERROR invalid size %d\n", size);
+ return;
+ }
+
+ sizemask = size-1;
+ field_width = size*2;
+
+ /* Adjust start/end to be on appropriate boundary for size */
+ buffer = (const char *)((long)buffer & ~sizemask);
+ pend = (const unsigned char *)
+ (((long)buffer + length + sizemask) & ~sizemask);
+
+ if (flags & DBGPRINT_BUFFADDR) {
+ /* Move start back to nearest multiple of line size,
+ * if printing address. This results in nicely formatted output
+ * with addresses being on line size (16) byte boundaries */
+ pstart = (const unsigned char *)((long)buffer & ~(LINE_SIZE-1));
+ } else {
+ pstart = (const unsigned char *)buffer;
+ }
+
+ /* Set value of start VA to print if addresses asked for */
+ pstart_va = (const unsigned char *)buffer_va
+ - ((const unsigned char *)buffer-pstart);
+
+ /* Calculate end position to nicely align right hand side */
+ pend_str = pstart + (((pend-pstart) + LINE_SIZE-1) & ~(LINE_SIZE-1));
+
+ /* Init strings */
+ *pbytes = *pascii = '\0';
+
+ /* Start at beginning of first line */
+ p = pstart;
+ count = 0;
+
+ while (p < pend_str) {
+ if (p < (const unsigned char *)buffer || p >= pend) {
+ /* Before start of buffer or after end- print spaces */
+ pbytes += sprintf(pbytes, "%*c ", field_width, ' ');
+ pascii += sprintf(pascii, "%*c", size, ' ');
+ p += size;
+ } else {
+ /* Add hex and ascii to strings */
+ int val;
+ switch (size) {
+ default:
+ case 1:
+ val = *(unsigned char *)p;
+ break;
+ case 2:
+ val = *(unsigned short *)p;
+ break;
+ case 4:
+ val = *(unsigned int *)p;
+ break;
+ }
+
+ pbytes += sprintf(pbytes, "%0*x ", field_width, val);
+
+ for (index = size; index; index--) {
+ *pascii++ = isprint(*p) ? *p : '.';
+ p++;
+ }
+ }
+
+ count++;
+
+ if (count == LINE_ENTRIES || p >= pend_str) {
+ /* Null terminate and print record */
+ *pascii = '\0';
+ printk(KERN_DEBUG "%s%8.8lx: %*s|%*s|\n",
+ prefix,
+ (flags & DBGPRINT_BUFFADDR)
+ ? (long)pstart_va:(long)offset,
+ LINE_ENTRIES*(field_width+1), bytes_str,
+ LINE_SIZE, ascii_str);
+
+ /* Move onto next line */
+ pstart_va += (p-pstart);
+ pstart = p;
+ count = 0;
+ offset += LINE_SIZE;
+
+ /* Re-init strings */
+ pbytes = bytes_str;
+ pascii = ascii_str;
+ *pbytes = *pascii = '\0';
+ }
+ }
+}
+
+#define PSM(A) \
+do { \
+ if (mask.A) { \
+ int i = snprintf(p, len, " " #A "( %s )", \
+ A##s_to_name(val.A)); \
+ if (i >= len) \
+ return op; \
+ p += i; \
+ len -= i; \
+ } \
+} while (0)
+
+STATIC char *dump_st(char *p, int len, union drbd_state_t mask, union drbd_state_t val)
+{
+ char *op = p;
+ *p = '\0';
+ PSM(role);
+ PSM(peer);
+ PSM(conn);
+ PSM(disk);
+ PSM(pdsk);
+
+ return op;
+}
+
+#define INFOP(fmt, args...) \
+do { \
+ if (trace_level >= TraceLvlAll) { \
+ INFO("%s:%d: %s [%d] %s %s " fmt , \
+ file, line, current->comm, current->pid, \
+ sockname, recv ? "<<<" : ">>>" , \
+ ## args); \
+ } else { \
+ INFO("%s %s " fmt, sockname, \
+ recv ? "<<<" : ">>>" , \
+ ## args); \
+ } \
+} while (0)
+
+STATIC char *_dump_block_id(u64 block_id, char *buff)
+{
+ if (is_syncer_block_id(block_id))
+ strcpy(buff, "SyncerId");
+ else
+ sprintf(buff, "%llx", (unsigned long long)block_id);
+
+ return buff;
+}
+
+void
+_dump_packet(struct drbd_conf *mdev, struct socket *sock,
+ int recv, union Drbd_Polymorph_Packet *p, char *file, int line)
+{
+ char *sockname = sock == mdev->meta.socket ? "meta" : "data";
+ int cmd = (recv == 2) ? p->head.command : be16_to_cpu(p->head.command);
+ char tmp[300];
+ union drbd_state_t m, v;
+
+ switch (cmd) {
+ case HandShake:
+ INFOP("%s (protocol %u-%u)\n", cmdname(cmd),
+ be32_to_cpu(p->HandShake.protocol_min),
+ be32_to_cpu(p->HandShake.protocol_max));
+ break;
+
+ case ReportBitMap: /* don't report this */
+ case ReportCBitMap: /* don't report this */
+ break;
+
+ case Data:
+ INFOP("%s (sector %llus, id %s, seq %u, f %x)\n", cmdname(cmd),
+ (unsigned long long)be64_to_cpu(p->Data.sector),
+ _dump_block_id(p->Data.block_id, tmp),
+ be32_to_cpu(p->Data.seq_num),
+ be32_to_cpu(p->Data.dp_flags)
+ );
+ break;
+
+ case DataReply:
+ case RSDataReply:
+ INFOP("%s (sector %llus, id %s)\n", cmdname(cmd),
+ (unsigned long long)be64_to_cpu(p->Data.sector),
+ _dump_block_id(p->Data.block_id, tmp)
+ );
+ break;
+
+ case RecvAck:
+ case WriteAck:
+ case RSWriteAck:
+ case DiscardAck:
+ case NegAck:
+ case NegRSDReply:
+ INFOP("%s (sector %llus, size %u, id %s, seq %u)\n",
+ cmdname(cmd),
+ (long long)be64_to_cpu(p->BlockAck.sector),
+ be32_to_cpu(p->BlockAck.blksize),
+ _dump_block_id(p->BlockAck.block_id, tmp),
+ be32_to_cpu(p->BlockAck.seq_num)
+ );
+ break;
+
+ case DataRequest:
+ case RSDataRequest:
+ INFOP("%s (sector %llus, size %u, id %s)\n", cmdname(cmd),
+ (long long)be64_to_cpu(p->BlockRequest.sector),
+ be32_to_cpu(p->BlockRequest.blksize),
+ _dump_block_id(p->BlockRequest.block_id, tmp)
+ );
+ break;
+
+ case Barrier:
+ case BarrierAck:
+ INFOP("%s (barrier %u)\n", cmdname(cmd), p->Barrier.barrier);
+ break;
+
+ case SyncParam:
+ case SyncParam89:
+ INFOP("%s (rate %u, verify-alg \"%.64s\", csums-alg \"%.64s\")\n",
+ cmdname(cmd), be32_to_cpu(p->SyncParam89.rate),
+ p->SyncParam89.verify_alg, p->SyncParam89.csums_alg);
+ break;
+
+ case ReportUUIDs:
+ INFOP("%s Curr:%016llX, Bitmap:%016llX, "
+ "HisSt:%016llX, HisEnd:%016llX\n",
+ cmdname(cmd),
+ (unsigned long long)be64_to_cpu(p->GenCnt.uuid[Current]),
+ (unsigned long long)be64_to_cpu(p->GenCnt.uuid[Bitmap]),
+ (unsigned long long)be64_to_cpu(p->GenCnt.uuid[History_start]),
+ (unsigned long long)be64_to_cpu(p->GenCnt.uuid[History_end]));
+ break;
+
+ case ReportSizes:
+ INFOP("%s (d %lluMiB, u %lluMiB, c %lldMiB, "
+ "max bio %x, q order %x)\n",
+ cmdname(cmd),
+ (long long)(be64_to_cpu(p->Sizes.d_size)>>(20-9)),
+ (long long)(be64_to_cpu(p->Sizes.u_size)>>(20-9)),
+ (long long)(be64_to_cpu(p->Sizes.c_size)>>(20-9)),
+ be32_to_cpu(p->Sizes.max_segment_size),
+ be32_to_cpu(p->Sizes.queue_order_type));
+ break;
+
+ case ReportState:
+ v.i = be32_to_cpu(p->State.state);
+ m.i = 0xffffffff;
+ dump_st(tmp, sizeof(tmp), m, v);
+ INFOP("%s (s %x {%s})\n", cmdname(cmd), v.i, tmp);
+ break;
+
+ case StateChgRequest:
+ m.i = be32_to_cpu(p->ReqState.mask);
+ v.i = be32_to_cpu(p->ReqState.val);
+ dump_st(tmp, sizeof(tmp), m, v);
+ INFOP("%s (m %x v %x {%s})\n", cmdname(cmd), m.i, v.i, tmp);
+ break;
+
+ case StateChgReply:
+ INFOP("%s (ret %x)\n", cmdname(cmd),
+ be32_to_cpu(p->RqSReply.retcode));
+ break;
+
+ case Ping:
+ case PingAck:
+ /*
+ * Dont trace pings at summary level
+ */
+ if (trace_level < TraceLvlAll)
+ break;
+ /* fall through... */
+ default:
+ INFOP("%s (%u)\n", cmdname(cmd), cmd);
+ break;
+ }
+}
+
+/* Debug routine to dump info about bio */
+
+void _dump_bio(const char *pfx, struct drbd_conf *mdev, struct bio *bio, int complete, struct drbd_request *r)
+{
+#ifdef CONFIG_LBD
+#define SECTOR_FORMAT "%Lx"
+#else
+#define SECTOR_FORMAT "%lx"
+#endif
+#define SECTOR_SHIFT 9
+
+ unsigned long lowaddr = (unsigned long)(bio->bi_sector << SECTOR_SHIFT);
+ char *faddr = (char *)(lowaddr);
+ char rb[sizeof(void *)*2+6] = { 0, };
+ struct bio_vec *bvec;
+ int segno;
+
+ const int rw = bio->bi_rw;
+ const int biorw = (rw & (RW_MASK|RWA_MASK));
+ const int biobarrier = (rw & (1<<BIO_RW_BARRIER));
+ const int biosync = (rw & ((1<<BIO_RW_UNPLUG) | (1<<BIO_RW_SYNCIO)));
+
+ if (r)
+ sprintf(rb, "Req:%p ", r);
+
+ INFO("%s %s:%s%s%s Bio:%p %s- %soffset " SECTOR_FORMAT ", size %x\n",
+ complete ? "<<<" : ">>>",
+ pfx,
+ biorw == WRITE ? "Write" : "Read",
+ biobarrier ? " : B" : "",
+ biosync ? " : S" : "",
+ bio,
+ rb,
+ complete ? (drbd_bio_uptodate(bio) ? "Success, " : "Failed, ") : "",
+ bio->bi_sector << SECTOR_SHIFT,
+ bio->bi_size);
+
+ if (trace_level >= TraceLvlMetrics &&
+ ((biorw == WRITE) ^ complete)) {
+ printk(KERN_DEBUG " ind page offset length\n");
+ __bio_for_each_segment(bvec, bio, segno, 0) {
+ printk(KERN_DEBUG " [%d] %p %8.8x %8.8x\n", segno,
+ bvec->bv_page, bvec->bv_offset, bvec->bv_len);
+
+ if (trace_level >= TraceLvlAll) {
+ char *bvec_buf;
+ unsigned long flags;
+
+ bvec_buf = bvec_kmap_irq(bvec, &flags);
+
+ drbd_print_buffer(" ", DBGPRINT_BUFFADDR, 1,
+ bvec_buf,
+ faddr,
+ (bvec->bv_len <= 0x80)
+ ? bvec->bv_len : 0x80);
+
+ bvec_kunmap_irq(bvec_buf, &flags);
+
+ if (bvec->bv_len > 0x40)
+ printk(KERN_DEBUG " ....\n");
+
+ faddr += bvec->bv_len;
+ }
+ }
+ }
+}
+#endif
+
+module_init(drbd_init)
+module_exit(drbd_cleanup)
--
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