blob: f35db29cac76f5b23edc9e3affccc6d7b5a23745 [file] [log] [blame]
/*
drbd_nl.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@linbit.com>.
Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.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.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/drbd.h>
#include <linux/in.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/slab.h>
#include <linux/blkpg.h>
#include <linux/cpumask.h>
#include "drbd_int.h"
#include "drbd_protocol.h"
#include "drbd_req.h"
#include "drbd_state_change.h"
#include <asm/unaligned.h>
#include <linux/drbd_limits.h>
#include <linux/kthread.h>
#include <net/genetlink.h>
/* .doit */
// int drbd_adm_create_resource(struct sk_buff *skb, struct genl_info *info);
// int drbd_adm_delete_resource(struct sk_buff *skb, struct genl_info *info);
int drbd_adm_new_minor(struct sk_buff *skb, struct genl_info *info);
int drbd_adm_del_minor(struct sk_buff *skb, struct genl_info *info);
int drbd_adm_new_resource(struct sk_buff *skb, struct genl_info *info);
int drbd_adm_del_resource(struct sk_buff *skb, struct genl_info *info);
int drbd_adm_down(struct sk_buff *skb, struct genl_info *info);
int drbd_adm_set_role(struct sk_buff *skb, struct genl_info *info);
int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info);
int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info);
int drbd_adm_detach(struct sk_buff *skb, struct genl_info *info);
int drbd_adm_connect(struct sk_buff *skb, struct genl_info *info);
int drbd_adm_net_opts(struct sk_buff *skb, struct genl_info *info);
int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info);
int drbd_adm_start_ov(struct sk_buff *skb, struct genl_info *info);
int drbd_adm_new_c_uuid(struct sk_buff *skb, struct genl_info *info);
int drbd_adm_disconnect(struct sk_buff *skb, struct genl_info *info);
int drbd_adm_invalidate(struct sk_buff *skb, struct genl_info *info);
int drbd_adm_invalidate_peer(struct sk_buff *skb, struct genl_info *info);
int drbd_adm_pause_sync(struct sk_buff *skb, struct genl_info *info);
int drbd_adm_resume_sync(struct sk_buff *skb, struct genl_info *info);
int drbd_adm_suspend_io(struct sk_buff *skb, struct genl_info *info);
int drbd_adm_resume_io(struct sk_buff *skb, struct genl_info *info);
int drbd_adm_outdate(struct sk_buff *skb, struct genl_info *info);
int drbd_adm_resource_opts(struct sk_buff *skb, struct genl_info *info);
int drbd_adm_get_status(struct sk_buff *skb, struct genl_info *info);
int drbd_adm_get_timeout_type(struct sk_buff *skb, struct genl_info *info);
/* .dumpit */
int drbd_adm_get_status_all(struct sk_buff *skb, struct netlink_callback *cb);
int drbd_adm_dump_resources(struct sk_buff *skb, struct netlink_callback *cb);
int drbd_adm_dump_devices(struct sk_buff *skb, struct netlink_callback *cb);
int drbd_adm_dump_devices_done(struct netlink_callback *cb);
int drbd_adm_dump_connections(struct sk_buff *skb, struct netlink_callback *cb);
int drbd_adm_dump_connections_done(struct netlink_callback *cb);
int drbd_adm_dump_peer_devices(struct sk_buff *skb, struct netlink_callback *cb);
int drbd_adm_dump_peer_devices_done(struct netlink_callback *cb);
int drbd_adm_get_initial_state(struct sk_buff *skb, struct netlink_callback *cb);
#include <linux/drbd_genl_api.h>
#include "drbd_nla.h"
#include <linux/genl_magic_func.h>
static atomic_t drbd_genl_seq = ATOMIC_INIT(2); /* two. */
static atomic_t notify_genl_seq = ATOMIC_INIT(2); /* two. */
DEFINE_MUTEX(notification_mutex);
/* used blkdev_get_by_path, to claim our meta data device(s) */
static char *drbd_m_holder = "Hands off! this is DRBD's meta data device.";
static void drbd_adm_send_reply(struct sk_buff *skb, struct genl_info *info)
{
genlmsg_end(skb, genlmsg_data(nlmsg_data(nlmsg_hdr(skb))));
if (genlmsg_reply(skb, info))
pr_err("error sending genl reply\n");
}
/* Used on a fresh "drbd_adm_prepare"d reply_skb, this cannot fail: The only
* reason it could fail was no space in skb, and there are 4k available. */
static int drbd_msg_put_info(struct sk_buff *skb, const char *info)
{
struct nlattr *nla;
int err = -EMSGSIZE;
if (!info || !info[0])
return 0;
nla = nla_nest_start(skb, DRBD_NLA_CFG_REPLY);
if (!nla)
return err;
err = nla_put_string(skb, T_info_text, info);
if (err) {
nla_nest_cancel(skb, nla);
return err;
} else
nla_nest_end(skb, nla);
return 0;
}
/* This would be a good candidate for a "pre_doit" hook,
* and per-family private info->pointers.
* But we need to stay compatible with older kernels.
* If it returns successfully, adm_ctx members are valid.
*
* At this point, we still rely on the global genl_lock().
* If we want to avoid that, and allow "genl_family.parallel_ops", we may need
* to add additional synchronization against object destruction/modification.
*/
#define DRBD_ADM_NEED_MINOR 1
#define DRBD_ADM_NEED_RESOURCE 2
#define DRBD_ADM_NEED_CONNECTION 4
static int drbd_adm_prepare(struct drbd_config_context *adm_ctx,
struct sk_buff *skb, struct genl_info *info, unsigned flags)
{
struct drbd_genlmsghdr *d_in = info->userhdr;
const u8 cmd = info->genlhdr->cmd;
int err;
memset(adm_ctx, 0, sizeof(*adm_ctx));
/* genl_rcv_msg only checks for CAP_NET_ADMIN on "GENL_ADMIN_PERM" :( */
if (cmd != DRBD_ADM_GET_STATUS && !capable(CAP_NET_ADMIN))
return -EPERM;
adm_ctx->reply_skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
if (!adm_ctx->reply_skb) {
err = -ENOMEM;
goto fail;
}
adm_ctx->reply_dh = genlmsg_put_reply(adm_ctx->reply_skb,
info, &drbd_genl_family, 0, cmd);
/* put of a few bytes into a fresh skb of >= 4k will always succeed.
* but anyways */
if (!adm_ctx->reply_dh) {
err = -ENOMEM;
goto fail;
}
adm_ctx->reply_dh->minor = d_in->minor;
adm_ctx->reply_dh->ret_code = NO_ERROR;
adm_ctx->volume = VOLUME_UNSPECIFIED;
if (info->attrs[DRBD_NLA_CFG_CONTEXT]) {
struct nlattr *nla;
/* parse and validate only */
err = drbd_cfg_context_from_attrs(NULL, info);
if (err)
goto fail;
/* It was present, and valid,
* copy it over to the reply skb. */
err = nla_put_nohdr(adm_ctx->reply_skb,
info->attrs[DRBD_NLA_CFG_CONTEXT]->nla_len,
info->attrs[DRBD_NLA_CFG_CONTEXT]);
if (err)
goto fail;
/* and assign stuff to the adm_ctx */
nla = nested_attr_tb[__nla_type(T_ctx_volume)];
if (nla)
adm_ctx->volume = nla_get_u32(nla);
nla = nested_attr_tb[__nla_type(T_ctx_resource_name)];
if (nla)
adm_ctx->resource_name = nla_data(nla);
adm_ctx->my_addr = nested_attr_tb[__nla_type(T_ctx_my_addr)];
adm_ctx->peer_addr = nested_attr_tb[__nla_type(T_ctx_peer_addr)];
if ((adm_ctx->my_addr &&
nla_len(adm_ctx->my_addr) > sizeof(adm_ctx->connection->my_addr)) ||
(adm_ctx->peer_addr &&
nla_len(adm_ctx->peer_addr) > sizeof(adm_ctx->connection->peer_addr))) {
err = -EINVAL;
goto fail;
}
}
adm_ctx->minor = d_in->minor;
adm_ctx->device = minor_to_device(d_in->minor);
/* We are protected by the global genl_lock().
* But we may explicitly drop it/retake it in drbd_adm_set_role(),
* so make sure this object stays around. */
if (adm_ctx->device)
kref_get(&adm_ctx->device->kref);
if (adm_ctx->resource_name) {
adm_ctx->resource = drbd_find_resource(adm_ctx->resource_name);
}
if (!adm_ctx->device && (flags & DRBD_ADM_NEED_MINOR)) {
drbd_msg_put_info(adm_ctx->reply_skb, "unknown minor");
return ERR_MINOR_INVALID;
}
if (!adm_ctx->resource && (flags & DRBD_ADM_NEED_RESOURCE)) {
drbd_msg_put_info(adm_ctx->reply_skb, "unknown resource");
if (adm_ctx->resource_name)
return ERR_RES_NOT_KNOWN;
return ERR_INVALID_REQUEST;
}
if (flags & DRBD_ADM_NEED_CONNECTION) {
if (adm_ctx->resource) {
drbd_msg_put_info(adm_ctx->reply_skb, "no resource name expected");
return ERR_INVALID_REQUEST;
}
if (adm_ctx->device) {
drbd_msg_put_info(adm_ctx->reply_skb, "no minor number expected");
return ERR_INVALID_REQUEST;
}
if (adm_ctx->my_addr && adm_ctx->peer_addr)
adm_ctx->connection = conn_get_by_addrs(nla_data(adm_ctx->my_addr),
nla_len(adm_ctx->my_addr),
nla_data(adm_ctx->peer_addr),
nla_len(adm_ctx->peer_addr));
if (!adm_ctx->connection) {
drbd_msg_put_info(adm_ctx->reply_skb, "unknown connection");
return ERR_INVALID_REQUEST;
}
}
/* some more paranoia, if the request was over-determined */
if (adm_ctx->device && adm_ctx->resource &&
adm_ctx->device->resource != adm_ctx->resource) {
pr_warning("request: minor=%u, resource=%s; but that minor belongs to resource %s\n",
adm_ctx->minor, adm_ctx->resource->name,
adm_ctx->device->resource->name);
drbd_msg_put_info(adm_ctx->reply_skb, "minor exists in different resource");
return ERR_INVALID_REQUEST;
}
if (adm_ctx->device &&
adm_ctx->volume != VOLUME_UNSPECIFIED &&
adm_ctx->volume != adm_ctx->device->vnr) {
pr_warning("request: minor=%u, volume=%u; but that minor is volume %u in %s\n",
adm_ctx->minor, adm_ctx->volume,
adm_ctx->device->vnr,
adm_ctx->device->resource->name);
drbd_msg_put_info(adm_ctx->reply_skb, "minor exists as different volume");
return ERR_INVALID_REQUEST;
}
/* still, provide adm_ctx->resource always, if possible. */
if (!adm_ctx->resource) {
adm_ctx->resource = adm_ctx->device ? adm_ctx->device->resource
: adm_ctx->connection ? adm_ctx->connection->resource : NULL;
if (adm_ctx->resource)
kref_get(&adm_ctx->resource->kref);
}
return NO_ERROR;
fail:
nlmsg_free(adm_ctx->reply_skb);
adm_ctx->reply_skb = NULL;
return err;
}
static int drbd_adm_finish(struct drbd_config_context *adm_ctx,
struct genl_info *info, int retcode)
{
if (adm_ctx->device) {
kref_put(&adm_ctx->device->kref, drbd_destroy_device);
adm_ctx->device = NULL;
}
if (adm_ctx->connection) {
kref_put(&adm_ctx->connection->kref, &drbd_destroy_connection);
adm_ctx->connection = NULL;
}
if (adm_ctx->resource) {
kref_put(&adm_ctx->resource->kref, drbd_destroy_resource);
adm_ctx->resource = NULL;
}
if (!adm_ctx->reply_skb)
return -ENOMEM;
adm_ctx->reply_dh->ret_code = retcode;
drbd_adm_send_reply(adm_ctx->reply_skb, info);
return 0;
}
static void setup_khelper_env(struct drbd_connection *connection, char **envp)
{
char *afs;
/* FIXME: A future version will not allow this case. */
if (connection->my_addr_len == 0 || connection->peer_addr_len == 0)
return;
switch (((struct sockaddr *)&connection->peer_addr)->sa_family) {
case AF_INET6:
afs = "ipv6";
snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI6",
&((struct sockaddr_in6 *)&connection->peer_addr)->sin6_addr);
break;
case AF_INET:
afs = "ipv4";
snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI4",
&((struct sockaddr_in *)&connection->peer_addr)->sin_addr);
break;
default:
afs = "ssocks";
snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI4",
&((struct sockaddr_in *)&connection->peer_addr)->sin_addr);
}
snprintf(envp[3], 20, "DRBD_PEER_AF=%s", afs);
}
int drbd_khelper(struct drbd_device *device, char *cmd)
{
char *envp[] = { "HOME=/",
"TERM=linux",
"PATH=/sbin:/usr/sbin:/bin:/usr/bin",
(char[20]) { }, /* address family */
(char[60]) { }, /* address */
NULL };
char mb[14];
char *argv[] = {usermode_helper, cmd, mb, NULL };
struct drbd_connection *connection = first_peer_device(device)->connection;
struct sib_info sib;
int ret;
if (current == connection->worker.task)
set_bit(CALLBACK_PENDING, &connection->flags);
snprintf(mb, 14, "minor-%d", device_to_minor(device));
setup_khelper_env(connection, envp);
/* The helper may take some time.
* write out any unsynced meta data changes now */
drbd_md_sync(device);
drbd_info(device, "helper command: %s %s %s\n", usermode_helper, cmd, mb);
sib.sib_reason = SIB_HELPER_PRE;
sib.helper_name = cmd;
drbd_bcast_event(device, &sib);
notify_helper(NOTIFY_CALL, device, connection, cmd, 0);
ret = call_usermodehelper(usermode_helper, argv, envp, UMH_WAIT_PROC);
if (ret)
drbd_warn(device, "helper command: %s %s %s exit code %u (0x%x)\n",
usermode_helper, cmd, mb,
(ret >> 8) & 0xff, ret);
else
drbd_info(device, "helper command: %s %s %s exit code %u (0x%x)\n",
usermode_helper, cmd, mb,
(ret >> 8) & 0xff, ret);
sib.sib_reason = SIB_HELPER_POST;
sib.helper_exit_code = ret;
drbd_bcast_event(device, &sib);
notify_helper(NOTIFY_RESPONSE, device, connection, cmd, ret);
if (current == connection->worker.task)
clear_bit(CALLBACK_PENDING, &connection->flags);
if (ret < 0) /* Ignore any ERRNOs we got. */
ret = 0;
return ret;
}
enum drbd_peer_state conn_khelper(struct drbd_connection *connection, char *cmd)
{
char *envp[] = { "HOME=/",
"TERM=linux",
"PATH=/sbin:/usr/sbin:/bin:/usr/bin",
(char[20]) { }, /* address family */
(char[60]) { }, /* address */
NULL };
char *resource_name = connection->resource->name;
char *argv[] = {usermode_helper, cmd, resource_name, NULL };
int ret;
setup_khelper_env(connection, envp);
conn_md_sync(connection);
drbd_info(connection, "helper command: %s %s %s\n", usermode_helper, cmd, resource_name);
/* TODO: conn_bcast_event() ?? */
notify_helper(NOTIFY_CALL, NULL, connection, cmd, 0);
ret = call_usermodehelper(usermode_helper, argv, envp, UMH_WAIT_PROC);
if (ret)
drbd_warn(connection, "helper command: %s %s %s exit code %u (0x%x)\n",
usermode_helper, cmd, resource_name,
(ret >> 8) & 0xff, ret);
else
drbd_info(connection, "helper command: %s %s %s exit code %u (0x%x)\n",
usermode_helper, cmd, resource_name,
(ret >> 8) & 0xff, ret);
/* TODO: conn_bcast_event() ?? */
notify_helper(NOTIFY_RESPONSE, NULL, connection, cmd, ret);
if (ret < 0) /* Ignore any ERRNOs we got. */
ret = 0;
return ret;
}
static enum drbd_fencing_p highest_fencing_policy(struct drbd_connection *connection)
{
enum drbd_fencing_p fp = FP_NOT_AVAIL;
struct drbd_peer_device *peer_device;
int vnr;
rcu_read_lock();
idr_for_each_entry(&connection->peer_devices, peer_device, vnr) {
struct drbd_device *device = peer_device->device;
if (get_ldev_if_state(device, D_CONSISTENT)) {
struct disk_conf *disk_conf =
rcu_dereference(peer_device->device->ldev->disk_conf);
fp = max_t(enum drbd_fencing_p, fp, disk_conf->fencing);
put_ldev(device);
}
}
rcu_read_unlock();
return fp;
}
static bool resource_is_supended(struct drbd_resource *resource)
{
return resource->susp || resource->susp_fen || resource->susp_nod;
}
bool conn_try_outdate_peer(struct drbd_connection *connection)
{
struct drbd_resource * const resource = connection->resource;
unsigned int connect_cnt;
union drbd_state mask = { };
union drbd_state val = { };
enum drbd_fencing_p fp;
char *ex_to_string;
int r;
spin_lock_irq(&resource->req_lock);
if (connection->cstate >= C_WF_REPORT_PARAMS) {
drbd_err(connection, "Expected cstate < C_WF_REPORT_PARAMS\n");
spin_unlock_irq(&resource->req_lock);
return false;
}
connect_cnt = connection->connect_cnt;
spin_unlock_irq(&resource->req_lock);
fp = highest_fencing_policy(connection);
switch (fp) {
case FP_NOT_AVAIL:
drbd_warn(connection, "Not fencing peer, I'm not even Consistent myself.\n");
spin_lock_irq(&resource->req_lock);
if (connection->cstate < C_WF_REPORT_PARAMS) {
_conn_request_state(connection,
(union drbd_state) { { .susp_fen = 1 } },
(union drbd_state) { { .susp_fen = 0 } },
CS_VERBOSE | CS_HARD | CS_DC_SUSP);
/* We are no longer suspended due to the fencing policy.
* We may still be suspended due to the on-no-data-accessible policy.
* If that was OND_IO_ERROR, fail pending requests. */
if (!resource_is_supended(resource))
_tl_restart(connection, CONNECTION_LOST_WHILE_PENDING);
}
/* Else: in case we raced with a connection handshake,
* let the handshake figure out if we maybe can RESEND,
* and do not resume/fail pending requests here.
* Worst case is we stay suspended for now, which may be
* resolved by either re-establishing the replication link, or
* the next link failure, or eventually the administrator. */
spin_unlock_irq(&resource->req_lock);
return false;
case FP_DONT_CARE:
return true;
default: ;
}
r = conn_khelper(connection, "fence-peer");
switch ((r>>8) & 0xff) {
case P_INCONSISTENT: /* peer is inconsistent */
ex_to_string = "peer is inconsistent or worse";
mask.pdsk = D_MASK;
val.pdsk = D_INCONSISTENT;
break;
case P_OUTDATED: /* peer got outdated, or was already outdated */
ex_to_string = "peer was fenced";
mask.pdsk = D_MASK;
val.pdsk = D_OUTDATED;
break;
case P_DOWN: /* peer was down */
if (conn_highest_disk(connection) == D_UP_TO_DATE) {
/* we will(have) create(d) a new UUID anyways... */
ex_to_string = "peer is unreachable, assumed to be dead";
mask.pdsk = D_MASK;
val.pdsk = D_OUTDATED;
} else {
ex_to_string = "peer unreachable, doing nothing since disk != UpToDate";
}
break;
case P_PRIMARY: /* Peer is primary, voluntarily outdate myself.
* This is useful when an unconnected R_SECONDARY is asked to
* become R_PRIMARY, but finds the other peer being active. */
ex_to_string = "peer is active";
drbd_warn(connection, "Peer is primary, outdating myself.\n");
mask.disk = D_MASK;
val.disk = D_OUTDATED;
break;
case P_FENCING:
/* THINK: do we need to handle this
* like case 4, or more like case 5? */
if (fp != FP_STONITH)
drbd_err(connection, "fence-peer() = 7 && fencing != Stonith !!!\n");
ex_to_string = "peer was stonithed";
mask.pdsk = D_MASK;
val.pdsk = D_OUTDATED;
break;
default:
/* The script is broken ... */
drbd_err(connection, "fence-peer helper broken, returned %d\n", (r>>8)&0xff);
return false; /* Eventually leave IO frozen */
}
drbd_info(connection, "fence-peer helper returned %d (%s)\n",
(r>>8) & 0xff, ex_to_string);
/* Not using
conn_request_state(connection, mask, val, CS_VERBOSE);
here, because we might were able to re-establish the connection in the
meantime. */
spin_lock_irq(&resource->req_lock);
if (connection->cstate < C_WF_REPORT_PARAMS && !test_bit(STATE_SENT, &connection->flags)) {
if (connection->connect_cnt != connect_cnt)
/* In case the connection was established and droped
while the fence-peer handler was running, ignore it */
drbd_info(connection, "Ignoring fence-peer exit code\n");
else
_conn_request_state(connection, mask, val, CS_VERBOSE);
}
spin_unlock_irq(&resource->req_lock);
return conn_highest_pdsk(connection) <= D_OUTDATED;
}
static int _try_outdate_peer_async(void *data)
{
struct drbd_connection *connection = (struct drbd_connection *)data;
conn_try_outdate_peer(connection);
kref_put(&connection->kref, drbd_destroy_connection);
return 0;
}
void conn_try_outdate_peer_async(struct drbd_connection *connection)
{
struct task_struct *opa;
kref_get(&connection->kref);
/* We may just have force_sig()'ed this thread
* to get it out of some blocking network function.
* Clear signals; otherwise kthread_run(), which internally uses
* wait_on_completion_killable(), will mistake our pending signal
* for a new fatal signal and fail. */
flush_signals(current);
opa = kthread_run(_try_outdate_peer_async, connection, "drbd_async_h");
if (IS_ERR(opa)) {
drbd_err(connection, "out of mem, failed to invoke fence-peer helper\n");
kref_put(&connection->kref, drbd_destroy_connection);
}
}
enum drbd_state_rv
drbd_set_role(struct drbd_device *const device, enum drbd_role new_role, int force)
{
struct drbd_peer_device *const peer_device = first_peer_device(device);
struct drbd_connection *const connection = peer_device ? peer_device->connection : NULL;
const int max_tries = 4;
enum drbd_state_rv rv = SS_UNKNOWN_ERROR;
struct net_conf *nc;
int try = 0;
int forced = 0;
union drbd_state mask, val;
if (new_role == R_PRIMARY) {
struct drbd_connection *connection;
/* Detect dead peers as soon as possible. */
rcu_read_lock();
for_each_connection(connection, device->resource)
request_ping(connection);
rcu_read_unlock();
}
mutex_lock(device->state_mutex);
mask.i = 0; mask.role = R_MASK;
val.i = 0; val.role = new_role;
while (try++ < max_tries) {
rv = _drbd_request_state_holding_state_mutex(device, mask, val, CS_WAIT_COMPLETE);
/* in case we first succeeded to outdate,
* but now suddenly could establish a connection */
if (rv == SS_CW_FAILED_BY_PEER && mask.pdsk != 0) {
val.pdsk = 0;
mask.pdsk = 0;
continue;
}
if (rv == SS_NO_UP_TO_DATE_DISK && force &&
(device->state.disk < D_UP_TO_DATE &&
device->state.disk >= D_INCONSISTENT)) {
mask.disk = D_MASK;
val.disk = D_UP_TO_DATE;
forced = 1;
continue;
}
if (rv == SS_NO_UP_TO_DATE_DISK &&
device->state.disk == D_CONSISTENT && mask.pdsk == 0) {
D_ASSERT(device, device->state.pdsk == D_UNKNOWN);
if (conn_try_outdate_peer(connection)) {
val.disk = D_UP_TO_DATE;
mask.disk = D_MASK;
}
continue;
}
if (rv == SS_NOTHING_TO_DO)
goto out;
if (rv == SS_PRIMARY_NOP && mask.pdsk == 0) {
if (!conn_try_outdate_peer(connection) && force) {
drbd_warn(device, "Forced into split brain situation!\n");
mask.pdsk = D_MASK;
val.pdsk = D_OUTDATED;
}
continue;
}
if (rv == SS_TWO_PRIMARIES) {
/* Maybe the peer is detected as dead very soon...
retry at most once more in this case. */
int timeo;
rcu_read_lock();
nc = rcu_dereference(connection->net_conf);
timeo = nc ? (nc->ping_timeo + 1) * HZ / 10 : 1;
rcu_read_unlock();
schedule_timeout_interruptible(timeo);
if (try < max_tries)
try = max_tries - 1;
continue;
}
if (rv < SS_SUCCESS) {
rv = _drbd_request_state(device, mask, val,
CS_VERBOSE + CS_WAIT_COMPLETE);
if (rv < SS_SUCCESS)
goto out;
}
break;
}
if (rv < SS_SUCCESS)
goto out;
if (forced)
drbd_warn(device, "Forced to consider local data as UpToDate!\n");
/* Wait until nothing is on the fly :) */
wait_event(device->misc_wait, atomic_read(&device->ap_pending_cnt) == 0);
/* FIXME also wait for all pending P_BARRIER_ACK? */
if (new_role == R_SECONDARY) {
if (get_ldev(device)) {
device->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
put_ldev(device);
}
} else {
mutex_lock(&device->resource->conf_update);
nc = connection->net_conf;
if (nc)
nc->discard_my_data = 0; /* without copy; single bit op is atomic */
mutex_unlock(&device->resource->conf_update);
if (get_ldev(device)) {
if (((device->state.conn < C_CONNECTED ||
device->state.pdsk <= D_FAILED)
&& device->ldev->md.uuid[UI_BITMAP] == 0) || forced)
drbd_uuid_new_current(device);
device->ldev->md.uuid[UI_CURRENT] |= (u64)1;
put_ldev(device);
}
}
/* writeout of activity log covered areas of the bitmap
* to stable storage done in after state change already */
if (device->state.conn >= C_WF_REPORT_PARAMS) {
/* if this was forced, we should consider sync */
if (forced)
drbd_send_uuids(peer_device);
drbd_send_current_state(peer_device);
}
drbd_md_sync(device);
set_disk_ro(device->vdisk, new_role == R_SECONDARY);
kobject_uevent(&disk_to_dev(device->vdisk)->kobj, KOBJ_CHANGE);
out:
mutex_unlock(device->state_mutex);
return rv;
}
static const char *from_attrs_err_to_txt(int err)
{
return err == -ENOMSG ? "required attribute missing" :
err == -EOPNOTSUPP ? "unknown mandatory attribute" :
err == -EEXIST ? "can not change invariant setting" :
"invalid attribute value";
}
int drbd_adm_set_role(struct sk_buff *skb, struct genl_info *info)
{
struct drbd_config_context adm_ctx;
struct set_role_parms parms;
int err;
enum drbd_ret_code retcode;
retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
if (!adm_ctx.reply_skb)
return retcode;
if (retcode != NO_ERROR)
goto out;
memset(&parms, 0, sizeof(parms));
if (info->attrs[DRBD_NLA_SET_ROLE_PARMS]) {
err = set_role_parms_from_attrs(&parms, info);
if (err) {
retcode = ERR_MANDATORY_TAG;
drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
goto out;
}
}
genl_unlock();
mutex_lock(&adm_ctx.resource->adm_mutex);
if (info->genlhdr->cmd == DRBD_ADM_PRIMARY)
retcode = drbd_set_role(adm_ctx.device, R_PRIMARY, parms.assume_uptodate);
else
retcode = drbd_set_role(adm_ctx.device, R_SECONDARY, 0);
mutex_unlock(&adm_ctx.resource->adm_mutex);
genl_lock();
out:
drbd_adm_finish(&adm_ctx, info, retcode);
return 0;
}
/* Initializes the md.*_offset members, so we are able to find
* the on disk meta data.
*
* We currently have two possible layouts:
* external:
* |----------- md_size_sect ------------------|
* [ 4k superblock ][ activity log ][ Bitmap ]
* | al_offset == 8 |
* | bm_offset = al_offset + X |
* ==> bitmap sectors = md_size_sect - bm_offset
*
* internal:
* |----------- md_size_sect ------------------|
* [data.....][ Bitmap ][ activity log ][ 4k superblock ]
* | al_offset < 0 |
* | bm_offset = al_offset - Y |
* ==> bitmap sectors = Y = al_offset - bm_offset
*
* Activity log size used to be fixed 32kB,
* but is about to become configurable.
*/
static void drbd_md_set_sector_offsets(struct drbd_device *device,
struct drbd_backing_dev *bdev)
{
sector_t md_size_sect = 0;
unsigned int al_size_sect = bdev->md.al_size_4k * 8;
bdev->md.md_offset = drbd_md_ss(bdev);
switch (bdev->md.meta_dev_idx) {
default:
/* v07 style fixed size indexed meta data */
bdev->md.md_size_sect = MD_128MB_SECT;
bdev->md.al_offset = MD_4kB_SECT;
bdev->md.bm_offset = MD_4kB_SECT + al_size_sect;
break;
case DRBD_MD_INDEX_FLEX_EXT:
/* just occupy the full device; unit: sectors */
bdev->md.md_size_sect = drbd_get_capacity(bdev->md_bdev);
bdev->md.al_offset = MD_4kB_SECT;
bdev->md.bm_offset = MD_4kB_SECT + al_size_sect;
break;
case DRBD_MD_INDEX_INTERNAL:
case DRBD_MD_INDEX_FLEX_INT:
/* al size is still fixed */
bdev->md.al_offset = -al_size_sect;
/* we need (slightly less than) ~ this much bitmap sectors: */
md_size_sect = drbd_get_capacity(bdev->backing_bdev);
md_size_sect = ALIGN(md_size_sect, BM_SECT_PER_EXT);
md_size_sect = BM_SECT_TO_EXT(md_size_sect);
md_size_sect = ALIGN(md_size_sect, 8);
/* plus the "drbd meta data super block",
* and the activity log; */
md_size_sect += MD_4kB_SECT + al_size_sect;
bdev->md.md_size_sect = md_size_sect;
/* bitmap offset is adjusted by 'super' block size */
bdev->md.bm_offset = -md_size_sect + MD_4kB_SECT;
break;
}
}
/* input size is expected to be in KB */
char *ppsize(char *buf, unsigned long long size)
{
/* Needs 9 bytes at max including trailing NUL:
* -1ULL ==> "16384 EB" */
static char units[] = { 'K', 'M', 'G', 'T', 'P', 'E' };
int base = 0;
while (size >= 10000 && base < sizeof(units)-1) {
/* shift + round */
size = (size >> 10) + !!(size & (1<<9));
base++;
}
sprintf(buf, "%u %cB", (unsigned)size, units[base]);
return buf;
}
/* there is still a theoretical deadlock when called from receiver
* on an D_INCONSISTENT R_PRIMARY:
* remote READ does inc_ap_bio, receiver would need to receive answer
* packet from remote to dec_ap_bio again.
* receiver receive_sizes(), comes here,
* waits for ap_bio_cnt == 0. -> deadlock.
* but this cannot happen, actually, because:
* R_PRIMARY D_INCONSISTENT, and peer's disk is unreachable
* (not connected, or bad/no disk on peer):
* see drbd_fail_request_early, ap_bio_cnt is zero.
* R_PRIMARY D_INCONSISTENT, and C_SYNC_TARGET:
* peer may not initiate a resize.
*/
/* Note these are not to be confused with
* drbd_adm_suspend_io/drbd_adm_resume_io,
* which are (sub) state changes triggered by admin (drbdsetup),
* and can be long lived.
* This changes an device->flag, is triggered by drbd internals,
* and should be short-lived. */
/* It needs to be a counter, since multiple threads might
independently suspend and resume IO. */
void drbd_suspend_io(struct drbd_device *device)
{
atomic_inc(&device->suspend_cnt);
if (drbd_suspended(device))
return;
wait_event(device->misc_wait, !atomic_read(&device->ap_bio_cnt));
}
void drbd_resume_io(struct drbd_device *device)
{
if (atomic_dec_and_test(&device->suspend_cnt))
wake_up(&device->misc_wait);
}
/**
* drbd_determine_dev_size() - Sets the right device size obeying all constraints
* @device: DRBD device.
*
* Returns 0 on success, negative return values indicate errors.
* You should call drbd_md_sync() after calling this function.
*/
enum determine_dev_size
drbd_determine_dev_size(struct drbd_device *device, enum dds_flags flags, struct resize_parms *rs) __must_hold(local)
{
struct md_offsets_and_sizes {
u64 last_agreed_sect;
u64 md_offset;
s32 al_offset;
s32 bm_offset;
u32 md_size_sect;
u32 al_stripes;
u32 al_stripe_size_4k;
} prev;
sector_t u_size, size;
struct drbd_md *md = &device->ldev->md;
char ppb[10];
void *buffer;
int md_moved, la_size_changed;
enum determine_dev_size rv = DS_UNCHANGED;
/* We may change the on-disk offsets of our meta data below. Lock out
* anything that may cause meta data IO, to avoid acting on incomplete
* layout changes or scribbling over meta data that is in the process
* of being moved.
*
* Move is not exactly correct, btw, currently we have all our meta
* data in core memory, to "move" it we just write it all out, there
* are no reads. */
drbd_suspend_io(device);
buffer = drbd_md_get_buffer(device, __func__); /* Lock meta-data IO */
if (!buffer) {
drbd_resume_io(device);
return DS_ERROR;
}
/* remember current offset and sizes */
prev.last_agreed_sect = md->la_size_sect;
prev.md_offset = md->md_offset;
prev.al_offset = md->al_offset;
prev.bm_offset = md->bm_offset;
prev.md_size_sect = md->md_size_sect;
prev.al_stripes = md->al_stripes;
prev.al_stripe_size_4k = md->al_stripe_size_4k;
if (rs) {
/* rs is non NULL if we should change the AL layout only */
md->al_stripes = rs->al_stripes;
md->al_stripe_size_4k = rs->al_stripe_size / 4;
md->al_size_4k = (u64)rs->al_stripes * rs->al_stripe_size / 4;
}
drbd_md_set_sector_offsets(device, device->ldev);
rcu_read_lock();
u_size = rcu_dereference(device->ldev->disk_conf)->disk_size;
rcu_read_unlock();
size = drbd_new_dev_size(device, device->ldev, u_size, flags & DDSF_FORCED);
if (size < prev.last_agreed_sect) {
if (rs && u_size == 0) {
/* Remove "rs &&" later. This check should always be active, but
right now the receiver expects the permissive behavior */
drbd_warn(device, "Implicit shrink not allowed. "
"Use --size=%llus for explicit shrink.\n",
(unsigned long long)size);
rv = DS_ERROR_SHRINK;
}
if (u_size > size)
rv = DS_ERROR_SPACE_MD;
if (rv != DS_UNCHANGED)
goto err_out;
}
if (drbd_get_capacity(device->this_bdev) != size ||
drbd_bm_capacity(device) != size) {
int err;
err = drbd_bm_resize(device, size, !(flags & DDSF_NO_RESYNC));
if (unlikely(err)) {
/* currently there is only one error: ENOMEM! */
size = drbd_bm_capacity(device);
if (size == 0) {
drbd_err(device, "OUT OF MEMORY! "
"Could not allocate bitmap!\n");
} else {
drbd_err(device, "BM resizing failed. "
"Leaving size unchanged\n");
}
rv = DS_ERROR;
}
/* racy, see comments above. */
drbd_set_my_capacity(device, size);
md->la_size_sect = size;
drbd_info(device, "size = %s (%llu KB)\n", ppsize(ppb, size>>1),
(unsigned long long)size>>1);
}
if (rv <= DS_ERROR)
goto err_out;
la_size_changed = (prev.last_agreed_sect != md->la_size_sect);
md_moved = prev.md_offset != md->md_offset
|| prev.md_size_sect != md->md_size_sect;
if (la_size_changed || md_moved || rs) {
u32 prev_flags;
/* We do some synchronous IO below, which may take some time.
* Clear the timer, to avoid scary "timer expired!" messages,
* "Superblock" is written out at least twice below, anyways. */
del_timer(&device->md_sync_timer);
/* We won't change the "al-extents" setting, we just may need
* to move the on-disk location of the activity log ringbuffer.
* Lock for transaction is good enough, it may well be "dirty"
* or even "starving". */
wait_event(device->al_wait, lc_try_lock_for_transaction(device->act_log));
/* mark current on-disk bitmap and activity log as unreliable */
prev_flags = md->flags;
md->flags |= MDF_FULL_SYNC | MDF_AL_DISABLED;
drbd_md_write(device, buffer);
drbd_al_initialize(device, buffer);
drbd_info(device, "Writing the whole bitmap, %s\n",
la_size_changed && md_moved ? "size changed and md moved" :
la_size_changed ? "size changed" : "md moved");
/* next line implicitly does drbd_suspend_io()+drbd_resume_io() */
drbd_bitmap_io(device, md_moved ? &drbd_bm_write_all : &drbd_bm_write,
"size changed", BM_LOCKED_MASK);
/* on-disk bitmap and activity log is authoritative again
* (unless there was an IO error meanwhile...) */
md->flags = prev_flags;
drbd_md_write(device, buffer);
if (rs)
drbd_info(device, "Changed AL layout to al-stripes = %d, al-stripe-size-kB = %d\n",
md->al_stripes, md->al_stripe_size_4k * 4);
}
if (size > prev.last_agreed_sect)
rv = prev.last_agreed_sect ? DS_GREW : DS_GREW_FROM_ZERO;
if (size < prev.last_agreed_sect)
rv = DS_SHRUNK;
if (0) {
err_out:
/* restore previous offset and sizes */
md->la_size_sect = prev.last_agreed_sect;
md->md_offset = prev.md_offset;
md->al_offset = prev.al_offset;
md->bm_offset = prev.bm_offset;
md->md_size_sect = prev.md_size_sect;
md->al_stripes = prev.al_stripes;
md->al_stripe_size_4k = prev.al_stripe_size_4k;
md->al_size_4k = (u64)prev.al_stripes * prev.al_stripe_size_4k;
}
lc_unlock(device->act_log);
wake_up(&device->al_wait);
drbd_md_put_buffer(device);
drbd_resume_io(device);
return rv;
}
sector_t
drbd_new_dev_size(struct drbd_device *device, struct drbd_backing_dev *bdev,
sector_t u_size, int assume_peer_has_space)
{
sector_t p_size = device->p_size; /* partner's disk size. */
sector_t la_size_sect = bdev->md.la_size_sect; /* last agreed size. */
sector_t m_size; /* my size */
sector_t size = 0;
m_size = drbd_get_max_capacity(bdev);
if (device->state.conn < C_CONNECTED && assume_peer_has_space) {
drbd_warn(device, "Resize while not connected was forced by the user!\n");
p_size = m_size;
}
if (p_size && m_size) {
size = min_t(sector_t, p_size, m_size);
} else {
if (la_size_sect) {
size = la_size_sect;
if (m_size && m_size < size)
size = m_size;
if (p_size && p_size < size)
size = p_size;
} else {
if (m_size)
size = m_size;
if (p_size)
size = p_size;
}
}
if (size == 0)
drbd_err(device, "Both nodes diskless!\n");
if (u_size) {
if (u_size > size)
drbd_err(device, "Requested disk size is too big (%lu > %lu)\n",
(unsigned long)u_size>>1, (unsigned long)size>>1);
else
size = u_size;
}
return size;
}
/**
* drbd_check_al_size() - Ensures that the AL is of the right size
* @device: DRBD device.
*
* Returns -EBUSY if current al lru is still used, -ENOMEM when allocation
* failed, and 0 on success. You should call drbd_md_sync() after you called
* this function.
*/
static int drbd_check_al_size(struct drbd_device *device, struct disk_conf *dc)
{
struct lru_cache *n, *t;
struct lc_element *e;
unsigned int in_use;
int i;
if (device->act_log &&
device->act_log->nr_elements == dc->al_extents)
return 0;
in_use = 0;
t = device->act_log;
n = lc_create("act_log", drbd_al_ext_cache, AL_UPDATES_PER_TRANSACTION,
dc->al_extents, sizeof(struct lc_element), 0);
if (n == NULL) {
drbd_err(device, "Cannot allocate act_log lru!\n");
return -ENOMEM;
}
spin_lock_irq(&device->al_lock);
if (t) {
for (i = 0; i < t->nr_elements; i++) {
e = lc_element_by_index(t, i);
if (e->refcnt)
drbd_err(device, "refcnt(%d)==%d\n",
e->lc_number, e->refcnt);
in_use += e->refcnt;
}
}
if (!in_use)
device->act_log = n;
spin_unlock_irq(&device->al_lock);
if (in_use) {
drbd_err(device, "Activity log still in use!\n");
lc_destroy(n);
return -EBUSY;
} else {
lc_destroy(t);
}
drbd_md_mark_dirty(device); /* we changed device->act_log->nr_elemens */
return 0;
}
static void blk_queue_discard_granularity(struct request_queue *q, unsigned int granularity)
{
q->limits.discard_granularity = granularity;
}
static unsigned int drbd_max_discard_sectors(struct drbd_connection *connection)
{
/* when we introduced REQ_WRITE_SAME support, we also bumped
* our maximum supported batch bio size used for discards. */
if (connection->agreed_features & DRBD_FF_WSAME)
return DRBD_MAX_BBIO_SECTORS;
/* before, with DRBD <= 8.4.6, we only allowed up to one AL_EXTENT_SIZE. */
return AL_EXTENT_SIZE >> 9;
}
static void decide_on_discard_support(struct drbd_device *device,
struct request_queue *q,
struct request_queue *b,
bool discard_zeroes_if_aligned)
{
/* q = drbd device queue (device->rq_queue)
* b = backing device queue (device->ldev->backing_bdev->bd_disk->queue),
* or NULL if diskless
*/
struct drbd_connection *connection = first_peer_device(device)->connection;
bool can_do = b ? blk_queue_discard(b) : true;
if (can_do && b && !b->limits.discard_zeroes_data && !discard_zeroes_if_aligned) {
can_do = false;
drbd_info(device, "discard_zeroes_data=0 and discard_zeroes_if_aligned=no: disabling discards\n");
}
if (can_do && connection->cstate >= C_CONNECTED && !(connection->agreed_features & DRBD_FF_TRIM)) {
can_do = false;
drbd_info(connection, "peer DRBD too old, does not support TRIM: disabling discards\n");
}
if (can_do) {
/* We don't care for the granularity, really.
* Stacking limits below should fix it for the local
* device. Whether or not it is a suitable granularity
* on the remote device is not our problem, really. If
* you care, you need to use devices with similar
* topology on all peers. */
blk_queue_discard_granularity(q, 512);
q->limits.max_discard_sectors = drbd_max_discard_sectors(connection);
queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
} else {
queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
blk_queue_discard_granularity(q, 0);
q->limits.max_discard_sectors = 0;
}
}
static void fixup_discard_if_not_supported(struct request_queue *q)
{
/* To avoid confusion, if this queue does not support discard, clear
* max_discard_sectors, which is what lsblk -D reports to the user.
* Older kernels got this wrong in "stack limits".
* */
if (!blk_queue_discard(q)) {
blk_queue_max_discard_sectors(q, 0);
blk_queue_discard_granularity(q, 0);
}
}
static void decide_on_write_same_support(struct drbd_device *device,
struct request_queue *q,
struct request_queue *b, struct o_qlim *o)
{
struct drbd_peer_device *peer_device = first_peer_device(device);
struct drbd_connection *connection = peer_device->connection;
bool can_do = b ? b->limits.max_write_same_sectors : true;
if (can_do && connection->cstate >= C_CONNECTED && !(connection->agreed_features & DRBD_FF_WSAME)) {
can_do = false;
drbd_info(peer_device, "peer does not support WRITE_SAME\n");
}
if (o) {
/* logical block size; queue_logical_block_size(NULL) is 512 */
unsigned int peer_lbs = be32_to_cpu(o->logical_block_size);
unsigned int me_lbs_b = queue_logical_block_size(b);
unsigned int me_lbs = queue_logical_block_size(q);
if (me_lbs_b != me_lbs) {
drbd_warn(device,
"logical block size of local backend does not match (drbd:%u, backend:%u); was this a late attach?\n",
me_lbs, me_lbs_b);
/* rather disable write same than trigger some BUG_ON later in the scsi layer. */
can_do = false;
}
if (me_lbs_b != peer_lbs) {
drbd_warn(peer_device, "logical block sizes do not match (me:%u, peer:%u); this may cause problems.\n",
me_lbs, peer_lbs);
if (can_do) {
drbd_dbg(peer_device, "logical block size mismatch: WRITE_SAME disabled.\n");
can_do = false;
}
me_lbs = max(me_lbs, me_lbs_b);
/* We cannot change the logical block size of an in-use queue.
* We can only hope that access happens to be properly aligned.
* If not, the peer will likely produce an IO error, and detach. */
if (peer_lbs > me_lbs) {
if (device->state.role != R_PRIMARY) {
blk_queue_logical_block_size(q, peer_lbs);
drbd_warn(peer_device, "logical block size set to %u\n", peer_lbs);
} else {
drbd_warn(peer_device,
"current Primary must NOT adjust logical block size (%u -> %u); hope for the best.\n",
me_lbs, peer_lbs);
}
}
}
if (can_do && !o->write_same_capable) {
/* If we introduce an open-coded write-same loop on the receiving side,
* the peer would present itself as "capable". */
drbd_dbg(peer_device, "WRITE_SAME disabled (peer device not capable)\n");
can_do = false;
}
}
blk_queue_max_write_same_sectors(q, can_do ? DRBD_MAX_BBIO_SECTORS : 0);
}
static void drbd_setup_queue_param(struct drbd_device *device, struct drbd_backing_dev *bdev,
unsigned int max_bio_size, struct o_qlim *o)
{
struct request_queue * const q = device->rq_queue;
unsigned int max_hw_sectors = max_bio_size >> 9;
unsigned int max_segments = 0;
struct request_queue *b = NULL;
struct disk_conf *dc;
bool discard_zeroes_if_aligned = true;
if (bdev) {
b = bdev->backing_bdev->bd_disk->queue;
max_hw_sectors = min(queue_max_hw_sectors(b), max_bio_size >> 9);
rcu_read_lock();
dc = rcu_dereference(device->ldev->disk_conf);
max_segments = dc->max_bio_bvecs;
discard_zeroes_if_aligned = dc->discard_zeroes_if_aligned;
rcu_read_unlock();
blk_set_stacking_limits(&q->limits);
}
blk_queue_max_hw_sectors(q, max_hw_sectors);
/* This is the workaround for "bio would need to, but cannot, be split" */
blk_queue_max_segments(q, max_segments ? max_segments : BLK_MAX_SEGMENTS);
blk_queue_segment_boundary(q, PAGE_SIZE-1);
decide_on_discard_support(device, q, b, discard_zeroes_if_aligned);
decide_on_write_same_support(device, q, b, o);
if (b) {
blk_queue_stack_limits(q, b);
if (q->backing_dev_info.ra_pages != b->backing_dev_info.ra_pages) {
drbd_info(device, "Adjusting my ra_pages to backing device's (%lu -> %lu)\n",
q->backing_dev_info.ra_pages,
b->backing_dev_info.ra_pages);
q->backing_dev_info.ra_pages = b->backing_dev_info.ra_pages;
}
}
fixup_discard_if_not_supported(q);
}
void drbd_reconsider_queue_parameters(struct drbd_device *device, struct drbd_backing_dev *bdev, struct o_qlim *o)
{
unsigned int now, new, local, peer;
now = queue_max_hw_sectors(device->rq_queue) << 9;
local = device->local_max_bio_size; /* Eventually last known value, from volatile memory */
peer = device->peer_max_bio_size; /* Eventually last known value, from meta data */
if (bdev) {
local = queue_max_hw_sectors(bdev->backing_bdev->bd_disk->queue) << 9;
device->local_max_bio_size = local;
}
local = min(local, DRBD_MAX_BIO_SIZE);
/* We may ignore peer limits if the peer is modern enough.
Because new from 8.3.8 onwards the peer can use multiple
BIOs for a single peer_request */
if (device->state.conn >= C_WF_REPORT_PARAMS) {
if (first_peer_device(device)->connection->agreed_pro_version < 94)
peer = min(device->peer_max_bio_size, DRBD_MAX_SIZE_H80_PACKET);
/* Correct old drbd (up to 8.3.7) if it believes it can do more than 32KiB */
else if (first_peer_device(device)->connection->agreed_pro_version == 94)
peer = DRBD_MAX_SIZE_H80_PACKET;
else if (first_peer_device(device)->connection->agreed_pro_version < 100)
peer = DRBD_MAX_BIO_SIZE_P95; /* drbd 8.3.8 onwards, before 8.4.0 */
else
peer = DRBD_MAX_BIO_SIZE;
/* We may later detach and re-attach on a disconnected Primary.
* Avoid this setting to jump back in that case.
* We want to store what we know the peer DRBD can handle,
* not what the peer IO backend can handle. */
if (peer > device->peer_max_bio_size)
device->peer_max_bio_size = peer;
}
new = min(local, peer);
if (device->state.role == R_PRIMARY && new < now)
drbd_err(device, "ASSERT FAILED new < now; (%u < %u)\n", new, now);
if (new != now)
drbd_info(device, "max BIO size = %u\n", new);
drbd_setup_queue_param(device, bdev, new, o);
}
/* Starts the worker thread */
static void conn_reconfig_start(struct drbd_connection *connection)
{
drbd_thread_start(&connection->worker);
drbd_flush_workqueue(&connection->sender_work);
}
/* if still unconfigured, stops worker again. */
static void conn_reconfig_done(struct drbd_connection *connection)
{
bool stop_threads;
spin_lock_irq(&connection->resource->req_lock);
stop_threads = conn_all_vols_unconf(connection) &&
connection->cstate == C_STANDALONE;
spin_unlock_irq(&connection->resource->req_lock);
if (stop_threads) {
/* ack_receiver thread and ack_sender workqueue are implicitly
* stopped by receiver in conn_disconnect() */
drbd_thread_stop(&connection->receiver);
drbd_thread_stop(&connection->worker);
}
}
/* Make sure IO is suspended before calling this function(). */
static void drbd_suspend_al(struct drbd_device *device)
{
int s = 0;
if (!lc_try_lock(device->act_log)) {
drbd_warn(device, "Failed to lock al in drbd_suspend_al()\n");
return;
}
drbd_al_shrink(device);
spin_lock_irq(&device->resource->req_lock);
if (device->state.conn < C_CONNECTED)
s = !test_and_set_bit(AL_SUSPENDED, &device->flags);
spin_unlock_irq(&device->resource->req_lock);
lc_unlock(device->act_log);
if (s)
drbd_info(device, "Suspended AL updates\n");
}
static bool should_set_defaults(struct genl_info *info)
{
unsigned flags = ((struct drbd_genlmsghdr*)info->userhdr)->flags;
return 0 != (flags & DRBD_GENL_F_SET_DEFAULTS);
}
static unsigned int drbd_al_extents_max(struct drbd_backing_dev *bdev)
{
/* This is limited by 16 bit "slot" numbers,
* and by available on-disk context storage.
*
* Also (u16)~0 is special (denotes a "free" extent).
*
* One transaction occupies one 4kB on-disk block,
* we have n such blocks in the on disk ring buffer,
* the "current" transaction may fail (n-1),
* and there is 919 slot numbers context information per transaction.
*
* 72 transaction blocks amounts to more than 2**16 context slots,
* so cap there first.
*/
const unsigned int max_al_nr = DRBD_AL_EXTENTS_MAX;
const unsigned int sufficient_on_disk =
(max_al_nr + AL_CONTEXT_PER_TRANSACTION -1)
/AL_CONTEXT_PER_TRANSACTION;
unsigned int al_size_4k = bdev->md.al_size_4k;
if (al_size_4k > sufficient_on_disk)
return max_al_nr;
return (al_size_4k - 1) * AL_CONTEXT_PER_TRANSACTION;
}
static bool write_ordering_changed(struct disk_conf *a, struct disk_conf *b)
{
return a->disk_barrier != b->disk_barrier ||
a->disk_flushes != b->disk_flushes ||
a->disk_drain != b->disk_drain;
}
static void sanitize_disk_conf(struct drbd_device *device, struct disk_conf *disk_conf,
struct drbd_backing_dev *nbc)
{
struct request_queue * const q = nbc->backing_bdev->bd_disk->queue;
if (disk_conf->al_extents < DRBD_AL_EXTENTS_MIN)
disk_conf->al_extents = DRBD_AL_EXTENTS_MIN;
if (disk_conf->al_extents > drbd_al_extents_max(nbc))
disk_conf->al_extents = drbd_al_extents_max(nbc);
if (!blk_queue_discard(q)
|| (!q->limits.discard_zeroes_data && !disk_conf->discard_zeroes_if_aligned)) {
if (disk_conf->rs_discard_granularity) {
disk_conf->rs_discard_granularity = 0; /* disable feature */
drbd_info(device, "rs_discard_granularity feature disabled\n");
}
}
if (disk_conf->rs_discard_granularity) {
int orig_value = disk_conf->rs_discard_granularity;
int remainder;
if (q->limits.discard_granularity > disk_conf->rs_discard_granularity)
disk_conf->rs_discard_granularity = q->limits.discard_granularity;
remainder = disk_conf->rs_discard_granularity % q->limits.discard_granularity;
disk_conf->rs_discard_granularity += remainder;
if (disk_conf->rs_discard_granularity > q->limits.max_discard_sectors << 9)
disk_conf->rs_discard_granularity = q->limits.max_discard_sectors << 9;
if (disk_conf->rs_discard_granularity != orig_value)
drbd_info(device, "rs_discard_granularity changed to %d\n",
disk_conf->rs_discard_granularity);
}
}
int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info)
{
struct drbd_config_context adm_ctx;
enum drbd_ret_code retcode;
struct drbd_device *device;
struct disk_conf *new_disk_conf, *old_disk_conf;
struct fifo_buffer *old_plan = NULL, *new_plan = NULL;
int err, fifo_size;
retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
if (!adm_ctx.reply_skb)
return retcode;
if (retcode != NO_ERROR)
goto finish;
device = adm_ctx.device;
mutex_lock(&adm_ctx.resource->adm_mutex);
/* we also need a disk
* to change the options on */
if (!get_ldev(device)) {
retcode = ERR_NO_DISK;
goto out;
}
new_disk_conf = kmalloc(sizeof(struct disk_conf), GFP_KERNEL);
if (!new_disk_conf) {
retcode = ERR_NOMEM;
goto fail;
}
mutex_lock(&device->resource->conf_update);
old_disk_conf = device->ldev->disk_conf;
*new_disk_conf = *old_disk_conf;
if (should_set_defaults(info))
set_disk_conf_defaults(new_disk_conf);
err = disk_conf_from_attrs_for_change(new_disk_conf, info);
if (err && err != -ENOMSG) {
retcode = ERR_MANDATORY_TAG;
drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
goto fail_unlock;
}
if (!expect(new_disk_conf->resync_rate >= 1))
new_disk_conf->resync_rate = 1;
sanitize_disk_conf(device, new_disk_conf, device->ldev);
if (new_disk_conf->c_plan_ahead > DRBD_C_PLAN_AHEAD_MAX)
new_disk_conf->c_plan_ahead = DRBD_C_PLAN_AHEAD_MAX;
fifo_size = (new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ;
if (fifo_size != device->rs_plan_s->size) {
new_plan = fifo_alloc(fifo_size);
if (!new_plan) {
drbd_err(device, "kmalloc of fifo_buffer failed");
retcode = ERR_NOMEM;
goto fail_unlock;
}
}
drbd_suspend_io(device);
wait_event(device->al_wait, lc_try_lock(device->act_log));
drbd_al_shrink(device);
err = drbd_check_al_size(device, new_disk_conf);
lc_unlock(device->act_log);
wake_up(&device->al_wait);
drbd_resume_io(device);
if (err) {
retcode = ERR_NOMEM;
goto fail_unlock;
}
lock_all_resources();
retcode = drbd_resync_after_valid(device, new_disk_conf->resync_after);
if (retcode == NO_ERROR) {
rcu_assign_pointer(device->ldev->disk_conf, new_disk_conf);
drbd_resync_after_changed(device);
}
unlock_all_resources();
if (retcode != NO_ERROR)
goto fail_unlock;
if (new_plan) {
old_plan = device->rs_plan_s;
rcu_assign_pointer(device->rs_plan_s, new_plan);
}
mutex_unlock(&device->resource->conf_update);
if (new_disk_conf->al_updates)
device->ldev->md.flags &= ~MDF_AL_DISABLED;
else
device->ldev->md.flags |= MDF_AL_DISABLED;
if (new_disk_conf->md_flushes)
clear_bit(MD_NO_FUA, &device->flags);
else
set_bit(MD_NO_FUA, &device->flags);
if (write_ordering_changed(old_disk_conf, new_disk_conf))
drbd_bump_write_ordering(device->resource, NULL, WO_BDEV_FLUSH);
if (old_disk_conf->discard_zeroes_if_aligned != new_disk_conf->discard_zeroes_if_aligned)
drbd_reconsider_queue_parameters(device, device->ldev, NULL);
drbd_md_sync(device);
if (device->state.conn >= C_CONNECTED) {
struct drbd_peer_device *peer_device;
for_each_peer_device(peer_device, device)
drbd_send_sync_param(peer_device);
}
synchronize_rcu();
kfree(old_disk_conf);
kfree(old_plan);
mod_timer(&device->request_timer, jiffies + HZ);
goto success;
fail_unlock:
mutex_unlock(&device->resource->conf_update);
fail:
kfree(new_disk_conf);
kfree(new_plan);
success:
put_ldev(device);
out:
mutex_unlock(&adm_ctx.resource->adm_mutex);
finish:
drbd_adm_finish(&adm_ctx, info, retcode);
return 0;
}
static struct block_device *open_backing_dev(struct drbd_device *device,
const char *bdev_path, void *claim_ptr, bool do_bd_link)
{
struct block_device *bdev;
int err = 0;
bdev = blkdev_get_by_path(bdev_path,
FMODE_READ | FMODE_WRITE | FMODE_EXCL, claim_ptr);
if (IS_ERR(bdev)) {
drbd_err(device, "open(\"%s\") failed with %ld\n",
bdev_path, PTR_ERR(bdev));
return bdev;
}
if (!do_bd_link)
return bdev;
err = bd_link_disk_holder(bdev, device->vdisk);
if (err) {
blkdev_put(bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
drbd_err(device, "bd_link_disk_holder(\"%s\", ...) failed with %d\n",
bdev_path, err);
bdev = ERR_PTR(err);
}
return bdev;
}
static int open_backing_devices(struct drbd_device *device,
struct disk_conf *new_disk_conf,
struct drbd_backing_dev *nbc)
{
struct block_device *bdev;
bdev = open_backing_dev(device, new_disk_conf->backing_dev, device, true);
if (IS_ERR(bdev))
return ERR_OPEN_DISK;
nbc->backing_bdev = bdev;
/*
* meta_dev_idx >= 0: external fixed size, possibly multiple
* drbd sharing one meta device. TODO in that case, paranoia
* check that [md_bdev, meta_dev_idx] is not yet used by some
* other drbd minor! (if you use drbd.conf + drbdadm, that
* should check it for you already; but if you don't, or
* someone fooled it, we need to double check here)
*/
bdev = open_backing_dev(device, new_disk_conf->meta_dev,
/* claim ptr: device, if claimed exclusively; shared drbd_m_holder,
* if potentially shared with other drbd minors */
(new_disk_conf->meta_dev_idx < 0) ? (void*)device : (void*)drbd_m_holder,
/* avoid double bd_claim_by_disk() for the same (source,target) tuple,
* as would happen with internal metadata. */
(new_disk_conf->meta_dev_idx != DRBD_MD_INDEX_FLEX_INT &&
new_disk_conf->meta_dev_idx != DRBD_MD_INDEX_INTERNAL));
if (IS_ERR(bdev))
return ERR_OPEN_MD_DISK;
nbc->md_bdev = bdev;
return NO_ERROR;
}
static void close_backing_dev(struct drbd_device *device, struct block_device *bdev,
bool do_bd_unlink)
{
if (!bdev)
return;
if (do_bd_unlink)
bd_unlink_disk_holder(bdev, device->vdisk);
blkdev_put(bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
}
void drbd_backing_dev_free(struct drbd_device *device, struct drbd_backing_dev *ldev)
{
if (ldev == NULL)
return;
close_backing_dev(device, ldev->md_bdev, ldev->md_bdev != ldev->backing_bdev);
close_backing_dev(device, ldev->backing_bdev, true);
kfree(ldev->disk_conf);
kfree(ldev);
}
int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
{
struct drbd_config_context adm_ctx;
struct drbd_device *device;
struct drbd_peer_device *peer_device;
struct drbd_connection *connection;
int err;
enum drbd_ret_code retcode;
enum determine_dev_size dd;
sector_t max_possible_sectors;
sector_t min_md_device_sectors;
struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */
struct disk_conf *new_disk_conf = NULL;
struct lru_cache *resync_lru = NULL;
struct fifo_buffer *new_plan = NULL;
union drbd_state ns, os;
enum drbd_state_rv rv;
struct net_conf *nc;
retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
if (!adm_ctx.reply_skb)
return retcode;
if (retcode != NO_ERROR)
goto finish;
device = adm_ctx.device;
mutex_lock(&adm_ctx.resource->adm_mutex);
peer_device = first_peer_device(device);
connection = peer_device->connection;
conn_reconfig_start(connection);
/* if you want to reconfigure, please tear down first */
if (device->state.disk > D_DISKLESS) {
retcode = ERR_DISK_CONFIGURED;
goto fail;
}
/* It may just now have detached because of IO error. Make sure
* drbd_ldev_destroy is done already, we may end up here very fast,
* e.g. if someone calls attach from the on-io-error handler,
* to realize a "hot spare" feature (not that I'd recommend that) */
wait_event(device->misc_wait, !test_bit(GOING_DISKLESS, &device->flags));
/* make sure there is no leftover from previous force-detach attempts */
clear_bit(FORCE_DETACH, &device->flags);
clear_bit(WAS_IO_ERROR, &device->flags);
clear_bit(WAS_READ_ERROR, &device->flags);
/* and no leftover from previously aborted resync or verify, either */
device->rs_total = 0;
device->rs_failed = 0;
atomic_set(&device->rs_pending_cnt, 0);
/* allocation not in the IO path, drbdsetup context */
nbc = kzalloc(sizeof(struct drbd_backing_dev), GFP_KERNEL);
if (!nbc) {
retcode = ERR_NOMEM;
goto fail;
}
spin_lock_init(&nbc->md.uuid_lock);
new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL);
if (!new_disk_conf) {
retcode = ERR_NOMEM;
goto fail;
}
nbc->disk_conf = new_disk_conf;
set_disk_conf_defaults(new_disk_conf);
err = disk_conf_from_attrs(new_disk_conf, info);
if (err) {
retcode = ERR_MANDATORY_TAG;
drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
goto fail;
}
if (new_disk_conf->c_plan_ahead > DRBD_C_PLAN_AHEAD_MAX)
new_disk_conf->c_plan_ahead = DRBD_C_PLAN_AHEAD_MAX;
new_plan = fifo_alloc((new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ);
if (!new_plan) {
retcode = ERR_NOMEM;
goto fail;
}
if (new_disk_conf->meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) {
retcode = ERR_MD_IDX_INVALID;
goto fail;
}
rcu_read_lock();
nc = rcu_dereference(connection->net_conf);
if (nc) {
if (new_disk_conf->fencing == FP_STONITH && nc->wire_protocol == DRBD_PROT_A) {
rcu_read_unlock();
retcode = ERR_STONITH_AND_PROT_A;
goto fail;
}
}
rcu_read_unlock();
retcode = open_backing_devices(device, new_disk_conf, nbc);
if (retcode != NO_ERROR)
goto fail;
if ((nbc->backing_bdev == nbc->md_bdev) !=
(new_disk_conf->meta_dev_idx == DRBD_MD_INDEX_INTERNAL ||
new_disk_conf->meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) {
retcode = ERR_MD_IDX_INVALID;
goto fail;
}
resync_lru = lc_create("resync", drbd_bm_ext_cache,
1, 61, sizeof(struct bm_extent),
offsetof(struct bm_extent, lce));
if (!resync_lru) {
retcode = ERR_NOMEM;
goto fail;
}
/* Read our meta data super block early.
* This also sets other on-disk offsets. */
retcode = drbd_md_read(device, nbc);
if (retcode != NO_ERROR)
goto fail;
sanitize_disk_conf(device, new_disk_conf, nbc);
if (drbd_get_max_capacity(nbc) < new_disk_conf->disk_size) {
drbd_err(device, "max capacity %llu smaller than disk size %llu\n",
(unsigned long long) drbd_get_max_capacity(nbc),
(unsigned long long) new_disk_conf->disk_size);
retcode = ERR_DISK_TOO_SMALL;
goto fail;
}
if (new_disk_conf->meta_dev_idx < 0) {
max_possible_sectors = DRBD_MAX_SECTORS_FLEX;
/* at least one MB, otherwise it does not make sense */
min_md_device_sectors = (2<<10);
} else {
max_possible_sectors = DRBD_MAX_SECTORS;
min_md_device_sectors = MD_128MB_SECT * (new_disk_conf->meta_dev_idx + 1);
}
if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) {
retcode = ERR_MD_DISK_TOO_SMALL;
drbd_warn(device, "refusing attach: md-device too small, "
"at least %llu sectors needed for this meta-disk type\n",
(unsigned long long) min_md_device_sectors);
goto fail;
}
/* Make sure the new disk is big enough
* (we may currently be R_PRIMARY with no local disk...) */
if (drbd_get_max_capacity(nbc) <
drbd_get_capacity(device->this_bdev)) {
retcode = ERR_DISK_TOO_SMALL;
goto fail;
}
nbc->known_size = drbd_get_capacity(nbc->backing_bdev);
if (nbc->known_size > max_possible_sectors) {
drbd_warn(device, "==> truncating very big lower level device "
"to currently maximum possible %llu sectors <==\n",
(unsigned long long) max_possible_sectors);
if (new_disk_conf->meta_dev_idx >= 0)
drbd_warn(device, "==>> using internal or flexible "
"meta data may help <<==\n");
}
drbd_suspend_io(device);
/* also wait for the last barrier ack. */
/* FIXME see also https://daiquiri.linbit/cgi-bin/bugzilla/show_bug.cgi?id=171
* We need a way to either ignore barrier acks for barriers sent before a device
* was attached, or a way to wait for all pending barrier acks to come in.
* As barriers are counted per resource,
* we'd need to suspend io on all devices of a resource.
*/
wait_event(device->misc_wait, !atomic_read(&device->ap_pending_cnt) || drbd_suspended(device));
/* and for any other previously queued work */
drbd_flush_workqueue(&connection->sender_work);
rv = _drbd_request_state(device, NS(disk, D_ATTACHING), CS_VERBOSE);
retcode = rv; /* FIXME: Type mismatch. */
drbd_resume_io(device);
if (rv < SS_SUCCESS)
goto fail;
if (!get_ldev_if_state(device, D_ATTACHING))
goto force_diskless;
if (!device->bitmap) {
if (drbd_bm_init(device)) {
retcode = ERR_NOMEM;
goto force_diskless_dec;
}
}
if (device->state.conn < C_CONNECTED &&
device->state.role == R_PRIMARY && device->ed_uuid &&
(device->ed_uuid & ~((u64)1)) != (nbc->md.uuid[UI_CURRENT] & ~((u64)1))) {
drbd_err(device, "Can only attach to data with current UUID=%016llX\n",
(unsigned long long)device->ed_uuid);
retcode = ERR_DATA_NOT_CURRENT;
goto force_diskless_dec;
}
/* Since we are diskless, fix the activity log first... */
if (drbd_check_al_size(device, new_disk_conf)) {
retcode = ERR_NOMEM;
goto force_diskless_dec;
}
/* Prevent shrinking of consistent devices ! */
if (drbd_md_test_flag(nbc, MDF_CONSISTENT) &&
drbd_new_dev_size(device, nbc, nbc->disk_conf->disk_size, 0) < nbc->md.la_size_sect) {
drbd_warn(device, "refusing to truncate a consistent device\n");
retcode = ERR_DISK_TOO_SMALL;
goto force_diskless_dec;
}
lock_all_resources();
retcode = drbd_resync_after_valid(device, new_disk_conf->resync_after);
if (retcode != NO_ERROR) {
unlock_all_resources();
goto force_diskless_dec;
}
/* Reset the "barriers don't work" bits here, then force meta data to
* be written, to ensure we determine if barriers are supported. */
if (new_disk_conf->md_flushes)
clear_bit(MD_NO_FUA, &device->flags);
else
set_bit(MD_NO_FUA, &device->flags);
/* Point of no return reached.
* Devices and memory are no longer released by error cleanup below.
* now device takes over responsibility, and the state engine should
* clean it up somewhere. */
D_ASSERT(device, device->ldev == NULL);
device->ldev = nbc;
device->resync = resync_lru;
device->rs_plan_s = new_plan;
nbc = NULL;
resync_lru = NULL;
new_disk_conf = NULL;
new_plan = NULL;
drbd_resync_after_changed(device);
drbd_bump_write_ordering(device->resource, device->ldev, WO_BDEV_FLUSH);
unlock_all_resources();
if (drbd_md_test_flag(device->ldev, MDF_CRASHED_PRIMARY))
set_bit(CRASHED_PRIMARY, &device->flags);
else
clear_bit(CRASHED_PRIMARY, &device->flags);
if (drbd_md_test_flag(device->ldev, MDF_PRIMARY_IND) &&
!(device->state.role == R_PRIMARY && device->resource->susp_nod))
set_bit(CRASHED_PRIMARY, &device->flags);
device->send_cnt = 0;
device->recv_cnt = 0;
device->read_cnt = 0;
device->writ_cnt = 0;
drbd_reconsider_queue_parameters(device, device->ldev, NULL);
/* If I am currently not R_PRIMARY,
* but meta data primary indicator is set,
* I just now recover from a hard crash,
* and have been R_PRIMARY before that crash.
*
* Now, if I had no connection before that crash
* (have been degraded R_PRIMARY), chances are that
* I won't find my peer now either.
*
* In that case, and _only_ in that case,
* we use the degr-wfc-timeout instead of the default,
* so we can automatically recover from a crash of a
* degraded but active "cluster" after a certain timeout.
*/
clear_bit(USE_DEGR_WFC_T, &device->flags);
if (device->state.role != R_PRIMARY &&
drbd_md_test_flag(device->ldev, MDF_PRIMARY_IND) &&
!drbd_md_test_flag(device->ldev, MDF_CONNECTED_IND))
set_bit(USE_DEGR_WFC_T, &device->flags);
dd = drbd_determine_dev_size(device, 0, NULL);
if (dd <= DS_ERROR) {
retcode = ERR_NOMEM_BITMAP;
goto force_diskless_dec;
} else if (dd == DS_GREW)
set_bit(RESYNC_AFTER_NEG, &device->flags);
if (drbd_md_test_flag(device->ldev, MDF_FULL_SYNC) ||
(test_bit(CRASHED_PRIMARY, &device->flags) &&
drbd_md_test_flag(device->ldev, MDF_AL_DISABLED))) {
drbd_info(device, "Assuming that all blocks are out of sync "
"(aka FullSync)\n");
if (drbd_bitmap_io(device, &drbd_bmio_set_n_write,
"set_n_write from attaching", BM_LOCKED_MASK)) {
retcode = ERR_IO_MD_DISK;
goto force_diskless_dec;
}
} else {
if (drbd_bitmap_io(device, &drbd_bm_read,
"read from attaching", BM_LOCKED_MASK)) {
retcode = ERR_IO_MD_DISK;
goto force_diskless_dec;
}
}
if (_drbd_bm_total_weight(device) == drbd_bm_bits(device))
drbd_suspend_al(device); /* IO is still suspended here... */
spin_lock_irq(&device->resource->req_lock);
os = drbd_read_state(device);
ns = os;
/* If MDF_CONSISTENT is not set go into inconsistent state,
otherwise investigate MDF_WasUpToDate...
If MDF_WAS_UP_TO_DATE is not set go into D_OUTDATED disk state,
otherwise into D_CONSISTENT state.
*/
if (drbd_md_test_flag(device->ldev, MDF_CONSISTENT)) {
if (drbd_md_test_flag(device->ldev, MDF_WAS_UP_TO_DATE))
ns.disk = D_CONSISTENT;
else
ns.disk = D_OUTDATED;
} else {
ns.disk = D_INCONSISTENT;
}
if (drbd_md_test_flag(device->ldev, MDF_PEER_OUT_DATED))
ns.pdsk = D_OUTDATED;
rcu_read_lock();
if (ns.disk == D_CONSISTENT &&
(ns.pdsk == D_OUTDATED || rcu_dereference(device->ldev->disk_conf)->fencing == FP_DONT_CARE))
ns.disk = D_UP_TO_DATE;
/* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND,
MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before
this point, because drbd_request_state() modifies these
flags. */
if (rcu_dereference(device->ldev->disk_conf)->al_updates)
device->ldev->md.flags &= ~MDF_AL_DISABLED;
else
device->ldev->md.flags |= MDF_AL_DISABLED;
rcu_read_unlock();
/* In case we are C_CONNECTED postpone any decision on the new disk
state after the negotiation phase. */
if (device->state.conn == C_CONNECTED) {
device->new_state_tmp.i = ns.i;
ns.i = os.i;
ns.disk = D_NEGOTIATING;
/* We expect to receive up-to-date UUIDs soon.
To avoid a race in receive_state, free p_uuid while
holding req_lock. I.e. atomic with the state change */
kfree(device->p_uuid);
device->p_uuid = NULL;
}
rv = _drbd_set_state(device, ns, CS_VERBOSE, NULL);
spin_unlock_irq(&device->resource->req_lock);
if (rv < SS_SUCCESS)
goto force_diskless_dec;
mod_timer(&device->request_timer, jiffies + HZ);
if (device->state.role == R_PRIMARY)
device->ldev->md.uuid[UI_CURRENT] |= (u64)1;
else
device->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
drbd_md_mark_dirty(device);
drbd_md_sync(device);
kobject_uevent(&disk_to_dev(device->vdisk)->kobj, KOBJ_CHANGE);
put_ldev(device);
conn_reconfig_done(connection);
mutex_unlock(&adm_ctx.resource->adm_mutex);
drbd_adm_finish(&adm_ctx, info, retcode);
return 0;
force_diskless_dec:
put_ldev(device);
force_diskless:
drbd_force_state(device, NS(disk, D_DISKLESS));
drbd_md_sync(device);
fail:
conn_reconfig_done(connection);
if (nbc) {
close_backing_dev(device, nbc->md_bdev, nbc->md_bdev != nbc->backing_bdev);
close_backing_dev(device, nbc->backing_bdev, true);
kfree(nbc);
}
kfree(new_disk_conf);
lc_destroy(resync_lru);
kfree(new_plan);
mutex_unlock(&adm_ctx.resource->adm_mutex);
finish:
drbd_adm_finish(&adm_ctx, info, retcode);
return 0;
}
static int adm_detach(struct drbd_device *device, int force)
{
enum drbd_state_rv retcode;
void *buffer;
int ret;
if (force) {
set_bit(FORCE_DETACH, &device->flags);
drbd_force_state(device, NS(disk, D_FAILED));
retcode = SS_SUCCESS;
goto out;
}
drbd_suspend_io(device); /* so no-one is stuck in drbd_al_begin_io */
buffer = drbd_md_get_buffer(device, __func__); /* make sure there is no in-flight meta-data IO */
if (buffer) {
retcode = drbd_request_state(device, NS(disk, D_FAILED));
drbd_md_put_buffer(device);
} else /* already <= D_FAILED */
retcode = SS_NOTHING_TO_DO;
/* D_FAILED will transition to DISKLESS. */
drbd_resume_io(device);
ret = wait_event_interruptible(device->misc_wait,
device->state.disk != D_FAILED);
if ((int)retcode == (int)SS_IS_DISKLESS)
retcode = SS_NOTHING_TO_DO;
if (ret)
retcode = ERR_INTR;
out:
return retcode;
}
/* Detaching the disk is a process in multiple stages. First we need to lock
* out application IO, in-flight IO, IO stuck in drbd_al_begin_io.
* Then we transition to D_DISKLESS, and wait for put_ldev() to return all
* internal references as well.
* Only then we have finally detached. */
int drbd_adm_detach(struct sk_buff *skb, struct genl_info *info)
{
struct drbd_config_context adm_ctx;
enum drbd_ret_code retcode;
struct detach_parms parms = { };
int err;
retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR);
if (!adm_ctx.reply_skb)
return retcode;
if (retcode != NO_ERROR)
goto out;
if (info->attrs[DRBD_NLA_DETACH_PARMS]) {
err = detach_parms_from_attrs(&parms, info);
if (err) {
retcode = ERR_MANDATORY_TAG;
drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
goto out;
}
}
mutex_lock(&adm_ctx.resource->adm_mutex);
retcode = adm_detach(adm_ctx.device, parms.force_detach);
mutex_unlock(&adm_ctx.resource->adm_mutex);
out:
drbd_adm_finish(&adm_ctx, info, retcode);
return 0;
}
static bool conn_resync_running(struct drbd_connection *connection)
{
struct drbd_peer_device *peer_device;
bool rv = false;
int vnr;
rcu_read_lock();
idr_for_each_entry(&connection->peer_devices, peer_device, vnr) {
struct drbd_device *device = peer_device->device;
if (device->state.conn == C_SYNC_SOURCE ||
device->state.conn == C_SYNC_TARGET ||
device->state.conn == C_PAUSED_SYNC_S ||
device->state.conn == C_PAUSED_SYNC_T) {
rv = true;
break;
}
}
rcu_read_unlock();
return rv;
}
static bool conn_ov_running(struct drbd_connection *connection)
{
struct drbd_peer_device *peer_device;
bool rv = false;
int vnr;
rcu_read_lock();
idr_for_each_entry(&connection->peer_devices, peer_device, vnr) {
struct drbd_device *device = peer_device->device;
if (device->state.conn == C_VERIFY_S ||
device->state.conn == C_VERIFY_T) {
rv = true;
break;
}
}
rcu_read_unlock();
return rv;
}
static enum drbd_ret_code
_check_net_options(struct drbd_connection *connection, struct net_conf *old_net_conf, struct net_conf *new_net_conf)
{
struct drbd_peer_device *peer_device;
int i;
if (old_net_conf && connection->cstate == C_WF_REPORT_PARAMS && connection->agreed_pro_version < 100) {
if (new_net_conf->wire_protocol != old_net_conf->wire_protocol)
return ERR_NEED_APV_100;
if (new_net_conf->two_primaries != old_net_conf->two_primaries)
return ERR_NEED_APV_100;
if (strcmp(new_net_conf->integrity_alg, old_net_conf->integrity_alg))
return ERR_NEED_APV_100;
}
if (!new_net_conf->two_primaries &&
conn_highest_role(connection) == R_PRIMARY &&
conn_highest_peer(connection) == R_PRIMARY)
return ERR_NEED_ALLOW_TWO_PRI;
if (new_net_conf->two_primaries &&
(new_net_conf->wire_protocol != DRBD_PROT_C))
return ERR_NOT_PROTO_C;
idr_for_each_entry(&connection->peer_devices, peer_device, i) {
struct drbd_device *device = peer_device->device;
if (get_ldev(device)) {
enum drbd_fencing_p fp = rcu_dereference(device->ldev->disk_conf)->fencing;
put_ldev(device);
if (new_net_conf->wire_protocol == DRBD_PROT_A && fp == FP_STONITH)
return ERR_STONITH_AND_PROT_A;
}
if (device->state.role == R_PRIMARY && new_net_conf->discard_my_data)
return ERR_DISCARD_IMPOSSIBLE;
}
if (new_net_conf->on_congestion != OC_BLOCK && new_net_conf->wire_protocol != DRBD_PROT_A)
return ERR_CONG_NOT_PROTO_A;
return NO_ERROR;
}
static enum drbd_ret_code
check_net_options(struct drbd_connection *connection, struct net_conf *new_net_conf)
{
static enum drbd_ret_code rv;
struct drbd_peer_device *peer_device;
int i;
rcu_read_lock();
rv = _check_net_options(connection, rcu_dereference(connection->net_conf), new_net_conf);
rcu_read_unlock();
/* connection->peer_devices protected by genl_lock() here */
idr_for_each_entry(&connection->peer_devices, peer_device, i) {
struct drbd_device *device = peer_device->device;
if (!device->bitmap) {
if (drbd_bm_init(device))
return ERR_NOMEM;
}
}
return rv;
}
struct crypto {
struct crypto_ahash *verify_tfm;
struct crypto_ahash *csums_tfm;
struct crypto_shash *cram_hmac_tfm;
struct crypto_ahash *integrity_tfm;
};
static int
alloc_shash(struct crypto_shash **tfm, char *tfm_name, int err_alg)
{
if (!tfm_name[0])
return NO_ERROR;
*tfm = crypto_alloc_shash(tfm_name, 0, 0);
if (IS_ERR(*tfm)) {
*tfm = NULL;
return err_alg;
}
return NO_ERROR;
}
static int
alloc_ahash(struct crypto_ahash **tfm, char *tfm_name, int err_alg)
{
if (!tfm_name[0])
return NO_ERROR;
*tfm = crypto_alloc_ahash(tfm_name, 0, CRYPTO_ALG_ASYNC);
if (IS_ERR(*tfm)) {
*tfm = NULL;
return err_alg;
}
return NO_ERROR;
}
static enum drbd_ret_code
alloc_crypto(struct crypto *crypto, struct net_conf *new_net_conf)
{
char hmac_name[CRYPTO_MAX_ALG_NAME];
enum drbd_ret_code rv;
rv = alloc_ahash(&crypto->csums_tfm, new_net_conf->csums_alg,
ERR_CSUMS_ALG);
if (rv != NO_ERROR)
return rv;
rv = alloc_ahash(&crypto->verify_tfm, new_net_conf->verify_alg,
ERR_VERIFY_ALG);
if (rv != NO_ERROR)
return rv;
rv = alloc_ahash(&crypto->integrity_tfm, new_net_conf->integrity_alg,
ERR_INTEGRITY_ALG);
if (rv != NO_ERROR)
return rv;
if (new_net_conf->cram_hmac_alg[0] != 0) {
snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)",
new_net_conf->cram_hmac_alg);
rv = alloc_shash(&crypto->cram_hmac_tfm, hmac_name,
ERR_AUTH_ALG);
}
return rv;
}
static void free_crypto(struct crypto *crypto)
{
crypto_free_shash(crypto->cram_hmac_tfm);
crypto_free_ahash(crypto->integrity_tfm);
crypto_free_ahash(crypto->csums_tfm);
crypto_free_ahash(crypto->verify_tfm);
}
int drbd_adm_net_opts(struct sk_buff *skb, struct genl_info *info)
{
struct drbd_config_context adm_ctx;
enum drbd_ret_code retcode;
struct drbd_connection *connection;
struct net_conf *old_net_conf, *new_net_conf = NULL;
int err;
int ovr; /* online verify running */
int rsr; /* re-sync running */
struct crypto crypto = { };
retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_CONNECTION);
if (!adm_ctx.reply_skb)
return retcode;
if (retcode != NO_ERROR)
goto finish;
connection = adm_ctx.connection;
mutex_lock(&adm_ctx.resource->adm_mutex);
new_net_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL);
if (!new_net_conf) {
retcode = ERR_NOMEM;
goto out;
}
conn_reconfig_start(connection);
mutex_lock(&connection->data.mutex);
mutex_lock(&connection->resource->conf_update);
old_net_conf = connection->net_conf;
if (!old_net_conf) {
drbd_msg_put_info(adm_ctx.reply_skb, "net conf missing, try connect");
retcode = ERR_INVALID_REQUEST;
goto fail;
}
*new_net_conf = *old_net_conf;
if (should_set_defaults(info))
set_net_conf_defaults(new_net_conf);
err = net_conf_from_attrs_for_change(new_net_conf, info);
if (err && err != -ENOMSG) {
retcode = ERR_MANDATORY_TAG;
drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
goto fail;
}
retcode = check_net_options(connection, new_net_conf);
if (retcode != NO_ERROR)
goto fail;
/* re-sync running */
rsr = conn_resync_running(connection);
if (rsr && strcmp(new_net_conf->csums_alg, old_net_conf->csums_alg)) {
retcode = ERR_CSUMS_RESYNC_RUNNING;
goto fail;
}
/* online verify running */
ovr = conn_ov_running(connection);
if (ovr && strcmp(new_net_conf->verify_alg, old_net_conf->verify_alg)) {
retcode = ERR_VERIFY_RUNNING;
goto fail;
}
retcode = alloc_crypto(&crypto, new_net_conf);
if (retcode != NO_ERROR)
goto fail;
rcu_assign_pointer(connection->net_conf, new_net_conf);
if (!rsr) {
crypto_free_ahash(connection->csums_tfm);
connection->csums_tfm = crypto.csums_tfm;
crypto.csums_tfm = NULL;
}
if (!ovr) {
crypto_free_ahash(connection->verify_tfm);
connection->verify_tfm = crypto.verify_tfm;
crypto.verify_tfm = NULL;
}
crypto_free_ahash(connection->integrity_tfm);
connection->integrity_tfm = crypto.integrity_tfm;
if (connection->cstate >= C_WF_REPORT_PARAMS && connection->agreed_pro_version >= 100)
/* Do this without trying to take connection->data.mutex again. */
__drbd_send_protocol(connection, P_PROTOCOL_UPDATE);
crypto_free_shash(connection->cram_hmac_tfm);
connection->cram_hmac_tfm = crypto.cram_hmac_tfm;
mutex_unlock(&connection->resource->conf_update);
mutex_unlock(&connection->data.mutex);
synchronize_rcu();
kfree(old_net_conf);
if (connection->cstate >= C_WF_REPORT_PARAMS) {
struct drbd_peer_device *peer_device;
int vnr;
idr_for_each_entry(&connection->peer_devices, peer_device, vnr)
drbd_send_sync_param(peer_device);
}
goto done;
fail:
mutex_unlock(&connection->resource->conf_update);
mutex_unlock(&connection->data.mutex);
free_crypto(&crypto);
kfree(new_net_conf);
done:
conn_reconfig_done(connection);
out:
mutex_unlock(&adm_ctx.resource->adm_mutex);
finish:
drbd_adm_finish(&adm_ctx, info, retcode);
return 0;
}
static void connection_to_info(struct connection_info *info,
struct drbd_connection *connection)
{
info->conn_connection_state = connection->cstate;
info->conn_role = conn_highest_peer(connection);
}
static void peer_device_to_info(struct peer_device_info *info,
struct drbd_peer_device *peer_device)
{
struct drbd_device *device = peer_device->device;
info->peer_repl_state =
max_t(enum drbd_conns, C_WF_REPORT_PARAMS, device->state.conn);
info->peer_disk_state = device->state.pdsk;
info->peer_resync_susp_user = device->state.user_isp;
info->peer_resync_susp_peer = device->state.peer_isp;
info->peer_resync_susp_dependency = device->state.aftr_isp;
}
int drbd_adm_connect(struct sk_buff *skb, struct genl_info *info)
{
struct connection_info connection_info;
enum drbd_notification_type flags;
unsigned int peer_devices = 0;
struct drbd_config_context adm_ctx;
struct drbd_peer_device *peer_device;
struct net_conf *old_net_conf, *new_net_conf = NULL;
struct crypto crypto = { };
struct drbd_resource *resource;
struct drbd_connection *connection;
enum drbd_ret_code retcode;
int i;
int err;
retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_RESOURCE);
if (!adm_ctx.reply_skb)
return retcode;
if (retcode != NO_ERROR)
goto out;
if (!(adm_ctx.my_addr && adm_ctx.peer_addr)) {
drbd_msg_put_info(adm_ctx.reply_skb, "connection endpoint(s) missing");
retcode = ERR_INVALID_REQUEST;
goto out;
}
/* No need for _rcu here. All reconfiguration is
* strictly serialized on genl_lock(). We are protected against
* concurrent reconfiguration/addition/deletion */
for_each_resource(resource, &drbd_resources) {
for_each_connection(connection, resource) {
if (nla_len(adm_ctx.my_addr) == connection->my_addr_len &&
!memcmp(nla_data(adm_ctx.my_addr), &connection->my_addr,
connection->my_addr_len)) {
retcode = ERR_LOCAL_ADDR;
goto out;
}
if (nla_len(adm_ctx.peer_addr) == connection->peer_addr_len &&
!memcmp(nla_data(adm_ctx.peer_addr), &connection->peer_addr,
connection->peer_addr_len)) {
retcode = ERR_PEER_ADDR;
goto out;
}
}
}
mutex_lock(&adm_ctx.resource->adm_mutex);
connection = first_connection(adm_ctx.resource);
conn_reconfig_start(connection);
if (connection->cstate > C_STANDALONE) {
retcode = ERR_NET_CONFIGURED;
goto fail;
}
/* allocation not in the IO path, drbdsetup / netlink process context */
new_net_conf = kzalloc(sizeof(*new_net_conf), GFP_KERNEL);
if (!new_net_conf) {
retcode = ERR_NOMEM;
goto fail;
}
set_net_conf_defaults(new_net_conf);
err = net_conf_from_attrs(new_net_conf, info);
if (err && err != -ENOMSG) {
retcode = ERR_MANDATORY_TAG;
drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
goto fail;
}
retcode = check_net_options(connection, new_net_conf);
if (retcode != NO_ERROR)
goto fail;
retcode = alloc_crypto(&crypto, new_net_conf);
if (retcode != NO_ERROR)
goto fail;
((char *)new_net_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0;
drbd_flush_workqueue(&connection->sender_work);
mutex_lock(&adm_ctx.resource->conf_update);
old_net_conf = connection->net_conf;
if (old_net_conf) {
retcode = ERR_NET_CONFIGURED;
mutex_unlock(&adm_ctx.resource->conf_update);
goto fail;
}
rcu_assign_pointer(connection->net_conf, new_net_conf);
conn_free_crypto(connection);
connection->cram_hmac_tfm = crypto.cram_hmac_tfm;
connection->integrity_tfm = crypto.integrity_tfm;
connection->csums_tfm = crypto.csums_tfm;
connection->verify_tfm = crypto.verify_tfm;
connection->my_addr_len = nla_len(adm_ctx.my_addr);
memcpy(&connection->my_addr, nla_data(adm_ctx.my_addr), connection->my_addr_len);
connection->peer_addr_len = nla_len(adm_ctx.peer_addr);
memcpy(&connection->peer_addr, nla_data(adm_ctx.peer_addr), connection->peer_addr_len);
idr_for_each_entry(&connection->peer_devices, peer_device, i) {
peer_devices++;
}
connection_to_info(&connection_info, connection);
flags = (peer_devices--) ? NOTIFY_CONTINUES : 0;
mutex_lock(&notification_mutex);
notify_connection_state(NULL, 0, connection, &connection_info, NOTIFY_CREATE | flags);
idr_for_each_entry(&connection->peer_devices, peer_device, i) {
struct peer_device_info peer_device_info;
peer_device_to_info(&peer_device_info, peer_device);
flags = (peer_devices--) ? NOTIFY_CONTINUES : 0;
notify_peer_device_state(NULL, 0, peer_device, &peer_device_info, NOTIFY_CREATE | flags);
}
mutex_unlock(&notification_mutex);
mutex_unlock(&adm_ctx.resource->conf_update);
rcu_read_lock();
idr_for_each_entry(&connection->peer_devices, peer_device, i) {
struct drbd_device *device = peer_device->device;
device->send_cnt = 0;
device->recv_cnt = 0;
}
rcu_read_unlock();
retcode = conn_request_state(connection, NS(conn, C_UNCONNECTED), CS_VERBOSE);