summaryrefslogtreecommitdiff
path: root/drivers/block/drbd/drbd_nl.c
diff options
context:
space:
mode:
authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /drivers/block/drbd/drbd_nl.c
Initial import
Diffstat (limited to 'drivers/block/drbd/drbd_nl.c')
-rw-r--r--drivers/block/drbd/drbd_nl.c3674
1 files changed, 3674 insertions, 0 deletions
diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
new file mode 100644
index 000000000..74df8cfad
--- /dev/null
+++ b/drivers/block/drbd/drbd_nl.c
@@ -0,0 +1,3674 @@
+/*
+ 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 <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);
+
+#include <linux/drbd_genl_api.h>
+#include "drbd_nla.h"
+#include <linux/genl_magic_func.h>
+
+/* 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[12];
+ 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, 12, "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);
+ 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);
+
+ if (current == connection->worker.task)
+ clear_bit(CALLBACK_PENDING, &connection->flags);
+
+ if (ret < 0) /* Ignore any ERRNOs we got. */
+ ret = 0;
+
+ return ret;
+}
+
+static int 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() ?? */
+
+ 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() ?? */
+
+ 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();
+
+ if (fp == FP_NOT_AVAIL) {
+ /* IO Suspending works on the whole resource.
+ Do it only for one device. */
+ vnr = 0;
+ peer_device = idr_get_next(&connection->peer_devices, &vnr);
+ drbd_change_state(peer_device->device, CS_VERBOSE | CS_HARD, NS(susp_fen, 0));
+ }
+
+ return fp;
+}
+
+bool conn_try_outdate_peer(struct drbd_connection *connection)
+{
+ 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(&connection->resource->req_lock);
+ if (connection->cstate >= C_WF_REPORT_PARAMS) {
+ drbd_err(connection, "Expected cstate < C_WF_REPORT_PARAMS\n");
+ spin_unlock_irq(&connection->resource->req_lock);
+ return false;
+ }
+
+ connect_cnt = connection->connect_cnt;
+ spin_unlock_irq(&connection->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");
+ goto out;
+ case FP_DONT_CARE:
+ return true;
+ default: ;
+ }
+
+ r = conn_khelper(connection, "fence-peer");
+
+ switch ((r>>8) & 0xff) {
+ case 3: /* peer is inconsistent */
+ ex_to_string = "peer is inconsistent or worse";
+ mask.pdsk = D_MASK;
+ val.pdsk = D_INCONSISTENT;
+ break;
+ case 4: /* peer got outdated, or was already outdated */
+ ex_to_string = "peer was fenced";
+ mask.pdsk = D_MASK;
+ val.pdsk = D_OUTDATED;
+ break;
+ case 5: /* 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 6: /* 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 7:
+ 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);
+
+ out:
+
+ /* 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(&connection->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(&connection->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. */
+void drbd_suspend_io(struct drbd_device *device)
+{
+ set_bit(SUSPEND_IO, &device->flags);
+ if (drbd_suspended(device))
+ return;
+ wait_event(device->misc_wait, !atomic_read(&device->ap_bio_cnt));
+}
+
+void drbd_resume_io(struct drbd_device *device)
+{
+ clear_bit(SUSPEND_IO, &device->flags);
+ 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)
+{
+ sector_t prev_first_sect, prev_size; /* previous meta location */
+ sector_t la_size_sect, u_size;
+ struct drbd_md *md = &device->ldev->md;
+ u32 prev_al_stripe_size_4k;
+ u32 prev_al_stripes;
+ sector_t size;
+ char ppb[10];
+ void *buffer;
+
+ int md_moved, la_size_changed;
+ enum determine_dev_size rv = DS_UNCHANGED;
+
+ /* race:
+ * application request passes inc_ap_bio,
+ * but then cannot get an AL-reference.
+ * this function later may wait on ap_bio_cnt == 0. -> deadlock.
+ *
+ * to avoid that:
+ * Suspend IO right here.
+ * still lock the act_log to not trigger ASSERTs there.
+ */
+ drbd_suspend_io(device);
+ buffer = drbd_md_get_buffer(device, __func__); /* Lock meta-data IO */
+ if (!buffer) {
+ drbd_resume_io(device);
+ return DS_ERROR;
+ }
+
+ /* no wait necessary anymore, actually we could assert that */
+ wait_event(device->al_wait, lc_try_lock(device->act_log));
+
+ prev_first_sect = drbd_md_first_sector(device->ldev);
+ prev_size = device->ldev->md.md_size_sect;
+ la_size_sect = device->ldev->md.la_size_sect;
+
+ if (rs) {
+ /* rs is non NULL if we should change the AL layout only */
+
+ prev_al_stripes = md->al_stripes;
+ prev_al_stripe_size_4k = md->al_stripe_size_4k;
+
+ 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 < la_size_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)>>1;
+ if (size == 0) {
+ drbd_err(device, "OUT OF MEMORY! "
+ "Could not allocate bitmap!\n");
+ } else {
+ drbd_err(device, "BM resizing failed. "
+ "Leaving size unchanged at size = %lu KB\n",
+ (unsigned long)size);
+ }
+ rv = DS_ERROR;
+ }
+ /* racy, see comments above. */
+ drbd_set_my_capacity(device, size);
+ device->ldev->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 = (la_size_sect != device->ldev->md.la_size_sect);
+
+ md_moved = prev_first_sect != drbd_md_first_sector(device->ldev)
+ || prev_size != device->ldev->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);
+ drbd_al_shrink(device); /* All extents inactive. */
+
+ prev_flags = md->flags;
+ md->flags &= ~MDF_PRIMARY_IND;
+ drbd_md_write(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);
+ drbd_initialize_al(device, buffer);
+
+ 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 > la_size_sect)
+ rv = la_size_sect ? DS_GREW : DS_GREW_FROM_ZERO;
+ if (size < la_size_sect)
+ rv = DS_SHRUNK;
+
+ if (0) {
+ err_out:
+ if (rs) {
+ 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;
+
+ drbd_md_set_sector_offsets(device, device->ldev);
+ }
+ }
+ 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 {
+ if (t)
+ lc_destroy(t);
+ }
+ drbd_md_mark_dirty(device); /* we changed device->act_log->nr_elemens */
+ return 0;
+}
+
+static void drbd_setup_queue_param(struct drbd_device *device, struct drbd_backing_dev *bdev,
+ unsigned int max_bio_size)
+{
+ 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;
+
+ 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();
+ max_segments = rcu_dereference(device->ldev->disk_conf)->max_bio_bvecs;
+ rcu_read_unlock();
+
+ blk_set_stacking_limits(&q->limits);
+ blk_queue_max_write_same_sectors(q, 0);
+ }
+
+ blk_queue_logical_block_size(q, 512);
+ 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_CACHE_SIZE-1);
+
+ if (b) {
+ struct drbd_connection *connection = first_peer_device(device)->connection;
+
+ if (blk_queue_discard(b) &&
+ (connection->cstate < C_CONNECTED || connection->agreed_features & FF_TRIM)) {
+ /* For now, don't allow more than one activity log extent worth of data
+ * to be discarded in one go. We may need to rework drbd_al_begin_io()
+ * to allow for even larger discard ranges */
+ q->limits.max_discard_sectors = DRBD_MAX_DISCARD_SECTORS;
+
+ queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
+ /* REALLY? Is stacking secdiscard "legal"? */
+ if (blk_queue_secdiscard(b))
+ queue_flag_set_unlocked(QUEUE_FLAG_SECDISCARD, q);
+ } else {
+ q->limits.max_discard_sectors = 0;
+ queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
+ queue_flag_clear_unlocked(QUEUE_FLAG_SECDISCARD, q);
+ }
+
+ 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;
+ }
+ }
+}
+
+void drbd_reconsider_max_bio_size(struct drbd_device *device, struct drbd_backing_dev *bdev)
+{
+ 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);
+}
+
+/* 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) {
+ /* asender is 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;
+}
+
+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;
+
+ if (new_disk_conf->al_extents < DRBD_AL_EXTENTS_MIN)
+ new_disk_conf->al_extents = DRBD_AL_EXTENTS_MIN;
+ if (new_disk_conf->al_extents > drbd_al_extents_max(device->ldev))
+ new_disk_conf->al_extents = drbd_al_extents_max(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;
+ }
+
+ write_lock_irq(&global_state_lock);
+ 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);
+ }
+ write_unlock_irq(&global_state_lock);
+
+ 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);
+
+ 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;
+}
+
+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 block_device *bdev;
+ 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 ? peer_device->connection : NULL;
+ 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;
+ }
+
+ write_lock_irq(&global_state_lock);
+ retcode = drbd_resync_after_valid(device, new_disk_conf->resync_after);
+ write_unlock_irq(&global_state_lock);
+ if (retcode != NO_ERROR)
+ 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();
+
+ bdev = blkdev_get_by_path(new_disk_conf->backing_dev,
+ FMODE_READ | FMODE_WRITE | FMODE_EXCL, device);
+ if (IS_ERR(bdev)) {
+ drbd_err(device, "open(\"%s\") failed with %ld\n", new_disk_conf->backing_dev,
+ PTR_ERR(bdev));
+ retcode = ERR_OPEN_DISK;
+ goto fail;
+ }
+ 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 = blkdev_get_by_path(new_disk_conf->meta_dev,
+ FMODE_READ | FMODE_WRITE | FMODE_EXCL,
+ (new_disk_conf->meta_dev_idx < 0) ?
+ (void *)device : (void *)drbd_m_holder);
+ if (IS_ERR(bdev)) {
+ drbd_err(device, "open(\"%s\") failed with %ld\n", new_disk_conf->meta_dev,
+ PTR_ERR(bdev));
+ retcode = ERR_OPEN_MD_DISK;
+ goto fail;
+ }
+ nbc->md_bdev = bdev;
+
+ 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;
+
+ if (new_disk_conf->al_extents < DRBD_AL_EXTENTS_MIN)
+ new_disk_conf->al_extents = DRBD_AL_EXTENTS_MIN;
+ if (new_disk_conf->al_extents > drbd_al_extents_max(nbc))
+ new_disk_conf->al_extents = drbd_al_extents_max(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;
+ }
+
+ /* 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_bump_write_ordering(device->resource, device->ldev, WO_bdev_flush);
+
+ 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_max_bio_size(device, device->ldev);
+
+ /* 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) {
+ if (nbc->backing_bdev)
+ blkdev_put(nbc->backing_bdev,
+ FMODE_READ | FMODE_WRITE | FMODE_EXCL);
+ if (nbc->md_bdev)
+ blkdev_put(nbc->md_bdev,
+ FMODE_READ | FMODE_WRITE | FMODE_EXCL);
+ 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;
+ 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 */
+ drbd_md_get_buffer(device, __func__); /* make sure there is no in-flight meta-data IO */
+ retcode = drbd_request_state(device, NS(disk, D_FAILED));
+ drbd_md_put_buffer(device);
+ /* D_FAILED will transition to DISKLESS. */
+ ret = wait_event_interruptible(device->misc_wait,
+ device->state.disk != D_FAILED);
+ drbd_resume_io(device);
+ 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_hash *verify_tfm;
+ struct crypto_hash *csums_tfm;
+ struct crypto_hash *cram_hmac_tfm;
+ struct crypto_hash *integrity_tfm;
+};
+
+static int
+alloc_hash(struct crypto_hash **tfm, char *tfm_name, int err_alg)
+{
+ if (!tfm_name[0])
+ return NO_ERROR;
+
+ *tfm = crypto_alloc_hash(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_hash(&crypto->csums_tfm, new_net_conf->csums_alg,
+ ERR_CSUMS_ALG);
+ if (rv != NO_ERROR)
+ return rv;
+ rv = alloc_hash(&crypto->verify_tfm, new_net_conf->verify_alg,
+ ERR_VERIFY_ALG);
+ if (rv != NO_ERROR)
+ return rv;
+ rv = alloc_hash(&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_hash(&crypto->cram_hmac_tfm, hmac_name,
+ ERR_AUTH_ALG);
+ }
+
+ return rv;
+}
+
+static void free_crypto(struct crypto *crypto)
+{
+ crypto_free_hash(crypto->cram_hmac_tfm);
+ crypto_free_hash(crypto->integrity_tfm);
+ crypto_free_hash(crypto->csums_tfm);
+ crypto_free_hash(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_hash(connection->csums_tfm);
+ connection->csums_tfm = crypto.csums_tfm;
+ crypto.csums_tfm = NULL;
+ }
+ if (!ovr) {
+ crypto_free_hash(connection->verify_tfm);
+ connection->verify_tfm = crypto.verify_tfm;
+ crypto.verify_tfm = NULL;
+ }
+
+ crypto_free_hash(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_hash(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;
+}
+
+int drbd_adm_connect(struct sk_buff *skb, struct genl_info *info)
+{
+ 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);
+
+ 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);
+
+ conn_reconfig_done(connection);
+ mutex_unlock(&adm_ctx.resource->adm_mutex);
+ drbd_adm_finish(&adm_ctx, info, retcode);
+ return 0;
+
+fail:
+ free_crypto(&crypto);
+ kfree(new_net_conf);
+
+ conn_reconfig_done(connection);
+ mutex_unlock(&adm_ctx.resource->adm_mutex);
+out:
+ drbd_adm_finish(&adm_ctx, info, retcode);
+ return 0;
+}
+
+static enum drbd_state_rv conn_try_disconnect(struct drbd_connection *connection, bool force)
+{
+ enum drbd_state_rv rv;
+
+ rv = conn_request_state(connection, NS(conn, C_DISCONNECTING),
+ force ? CS_HARD : 0);
+
+ switch (rv) {
+ case SS_NOTHING_TO_DO:
+ break;
+ case SS_ALREADY_STANDALONE:
+ return SS_SUCCESS;
+ case SS_PRIMARY_NOP:
+ /* Our state checking code wants to see the peer outdated. */
+ rv = conn_request_state(connection, NS2(conn, C_DISCONNECTING, pdsk, D_OUTDATED), 0);
+
+ if (rv == SS_OUTDATE_WO_CONN) /* lost connection before graceful disconnect succeeded */
+ rv = conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_VERBOSE);
+
+ break;
+ case SS_CW_FAILED_BY_PEER:
+ /* The peer probably wants to see us outdated. */
+ rv = conn_request_state(connection, NS2(conn, C_DISCONNECTING,
+ disk, D_OUTDATED), 0);
+ if (rv == SS_IS_DISKLESS || rv == SS_LOWER_THAN_OUTDATED) {
+ rv = conn_request_state(connection, NS(conn, C_DISCONNECTING),
+ CS_HARD);
+ }
+ break;
+ default:;
+ /* no special handling necessary */
+ }
+
+ if (rv >= SS_SUCCESS) {
+ enum drbd_state_rv rv2;
+ /* No one else can reconfigure the network while I am here.
+ * The state handling only uses drbd_thread_stop_nowait(),
+ * we want to really wait here until the receiver is no more.
+ */
+ drbd_thread_stop(&connection->receiver);
+
+ /* Race breaker. This additional state change request may be
+ * necessary, if this was a forced disconnect during a receiver
+ * restart. We may have "killed" the receiver thread just
+ * after drbd_receiver() returned. Typically, we should be
+ * C_STANDALONE already, now, and this becomes a no-op.
+ */
+ rv2 = conn_request_state(connection, NS(conn, C_STANDALONE),
+ CS_VERBOSE | CS_HARD);
+ if (rv2 < SS_SUCCESS)
+ drbd_err(connection,
+ "unexpected rv2=%d in conn_try_disconnect()\n",
+ rv2);
+ }
+ return rv;
+}
+
+int drbd_adm_disconnect(struct sk_buff *skb, struct genl_info *info)
+{
+ struct drbd_config_context adm_ctx;
+ struct disconnect_parms parms;
+ struct drbd_connection *connection;
+ enum drbd_state_rv rv;
+ enum drbd_ret_code retcode;
+ int err;
+
+ retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_CONNECTION);
+ if (!adm_ctx.reply_skb)
+ return retcode;
+ if (retcode != NO_ERROR)
+ goto fail;
+
+ connection = adm_ctx.connection;
+ memset(&parms, 0, sizeof(parms));
+ if (info->attrs[DRBD_NLA_DISCONNECT_PARMS]) {
+ err = disconnect_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 fail;
+ }
+ }
+
+ mutex_lock(&adm_ctx.resource->adm_mutex);
+ rv = conn_try_disconnect(connection, parms.force_disconnect);
+ if (rv < SS_SUCCESS)
+ retcode = rv; /* FIXME: Type mismatch. */
+ else
+ retcode = NO_ERROR;
+ mutex_unlock(&adm_ctx.resource->adm_mutex);
+ fail:
+ drbd_adm_finish(&adm_ctx, info, retcode);
+ return 0;
+}
+
+void resync_after_online_grow(struct drbd_device *device)
+{
+ int iass; /* I am sync source */
+
+ drbd_info(device, "Resync of new storage after online grow\n");
+ if (device->state.role != device->state.peer)
+ iass = (device->state.role == R_PRIMARY);
+ else
+ iass = test_bit(RESOLVE_CONFLICTS, &first_peer_device(device)->connection->flags);
+
+ if (iass)
+ drbd_start_resync(device, C_SYNC_SOURCE);
+ else
+ _drbd_request_state(device, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE + CS_SERIALIZE);
+}
+
+int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info)
+{
+ struct drbd_config_context adm_ctx;
+ struct disk_conf *old_disk_conf, *new_disk_conf = NULL;
+ struct resize_parms rs;
+ struct drbd_device *device;
+ enum drbd_ret_code retcode;
+ enum determine_dev_size dd;
+ bool change_al_layout = false;
+ enum dds_flags ddsf;
+ sector_t u_size;
+ 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 finish;
+
+ mutex_lock(&adm_ctx.resource->adm_mutex);
+ device = adm_ctx.device;
+ if (!get_ldev(device)) {
+ retcode = ERR_NO_DISK;
+ goto fail;
+ }
+
+ memset(&rs, 0, sizeof(struct resize_parms));
+ rs.al_stripes = device->ldev->md.al_stripes;
+ rs.al_stripe_size = device->ldev->md.al_stripe_size_4k * 4;
+ if (info->attrs[DRBD_NLA_RESIZE_PARMS]) {
+ err = resize_parms_from_attrs(&rs, info);
+ if (err) {
+ retcode = ERR_MANDATORY_TAG;
+ drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
+ goto fail_ldev;
+ }
+ }
+
+ if (device->state.conn > C_CONNECTED) {
+ retcode = ERR_RESIZE_RESYNC;
+ goto fail_ldev;
+ }
+
+ if (device->state.role == R_SECONDARY &&
+ device->state.peer == R_SECONDARY) {
+ retcode = ERR_NO_PRIMARY;
+ goto fail_ldev;
+ }
+
+ if (rs.no_resync && first_peer_device(device)->connection->agreed_pro_version < 93) {
+ retcode = ERR_NEED_APV_93;
+ goto fail_ldev;
+ }
+
+ rcu_read_lock();
+ u_size = rcu_dereference(device->ldev->disk_conf)->disk_size;
+ rcu_read_unlock();
+ if (u_size != (sector_t)rs.resize_size) {
+ new_disk_conf = kmalloc(sizeof(struct disk_conf), GFP_KERNEL);
+ if (!new_disk_conf) {
+ retcode = ERR_NOMEM;
+ goto fail_ldev;
+ }
+ }
+
+ if (device->ldev->md.al_stripes != rs.al_stripes ||
+ device->ldev->md.al_stripe_size_4k != rs.al_stripe_size / 4) {
+ u32 al_size_k = rs.al_stripes * rs.al_stripe_size;
+
+ if (al_size_k > (16 * 1024 * 1024)) {
+ retcode = ERR_MD_LAYOUT_TOO_BIG;
+ goto fail_ldev;
+ }
+
+ if (al_size_k < MD_32kB_SECT/2) {
+ retcode = ERR_MD_LAYOUT_TOO_SMALL;
+ goto fail_ldev;
+ }
+
+ if (device->state.conn != C_CONNECTED && !rs.resize_force) {
+ retcode = ERR_MD_LAYOUT_CONNECTED;
+ goto fail_ldev;
+ }
+
+ change_al_layout = true;
+ }
+
+ if (device->ldev->known_size != drbd_get_capacity(device->ldev->backing_bdev))
+ device->ldev->known_size = drbd_get_capacity(device->ldev->backing_bdev);
+
+ if (new_disk_conf) {
+ mutex_lock(&device->resource->conf_update);
+ old_disk_conf = device->ldev->disk_conf;
+ *new_disk_conf = *old_disk_conf;
+ new_disk_conf->disk_size = (sector_t)rs.resize_size;
+ rcu_assign_pointer(device->ldev->disk_conf, new_disk_conf);
+ mutex_unlock(&device->resource->conf_update);
+ synchronize_rcu();
+ kfree(old_disk_conf);
+ }
+
+ ddsf = (rs.resize_force ? DDSF_FORCED : 0) | (rs.no_resync ? DDSF_NO_RESYNC : 0);
+ dd = drbd_determine_dev_size(device, ddsf, change_al_layout ? &rs : NULL);
+ drbd_md_sync(device);
+ put_ldev(device);
+ if (dd == DS_ERROR) {
+ retcode = ERR_NOMEM_BITMAP;
+ goto fail;
+ } else if (dd == DS_ERROR_SPACE_MD) {
+ retcode = ERR_MD_LAYOUT_NO_FIT;
+ goto fail;
+ } else if (dd == DS_ERROR_SHRINK) {
+ retcode = ERR_IMPLICIT_SHRINK;
+ goto fail;
+ }
+
+ if (device->state.conn == C_CONNECTED) {
+ if (dd == DS_GREW)
+ set_bit(RESIZE_PENDING, &device->flags);
+
+ drbd_send_uuids(first_peer_device(device));
+ drbd_send_sizes(first_peer_device(device), 1, ddsf);
+ }
+
+ fail:
+ mutex_unlock(&adm_ctx.resource->adm_mutex);
+ finish:
+ drbd_adm_finish(&adm_ctx, info, retcode);
+ return 0;
+
+ fail_ldev:
+ put_ldev(device);
+ goto fail;
+}
+
+int drbd_adm_resource_opts(struct sk_buff *skb, struct genl_info *info)
+{
+ struct drbd_config_context adm_ctx;
+ enum drbd_ret_code retcode;
+ struct res_opts res_opts;
+ 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 fail;
+
+ res_opts = adm_ctx.resource->res_opts;
+ if (should_set_defaults(info))
+ set_res_opts_defaults(&res_opts);
+
+ err = res_opts_from_attrs(&res_opts, 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;
+ }
+
+ mutex_lock(&adm_ctx.resource->adm_mutex);
+ err = set_resource_options(adm_ctx.resource, &res_opts);
+ if (err) {
+ retcode = ERR_INVALID_REQUEST;
+ if (err == -ENOMEM)
+ retcode = ERR_NOMEM;
+ }
+ mutex_unlock(&adm_ctx.resource->adm_mutex);
+
+fail:
+ drbd_adm_finish(&adm_ctx, info, retcode);
+ return 0;
+}
+
+int drbd_adm_invalidate(struct sk_buff *skb, struct genl_info *info)
+{
+ struct drbd_config_context adm_ctx;
+ struct drbd_device *device;
+ int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
+
+ 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;
+
+ device = adm_ctx.device;
+ if (!get_ldev(device)) {
+ retcode = ERR_NO_DISK;
+ goto out;
+ }
+
+ mutex_lock(&adm_ctx.resource->adm_mutex);
+
+ /* If there is still bitmap IO pending, probably because of a previous
+ * resync just being finished, wait for it before requesting a new resync.
+ * Also wait for it's after_state_ch(). */
+ drbd_suspend_io(device);
+ wait_event(device->misc_wait, !test_bit(BITMAP_IO, &device->flags));
+ drbd_flush_workqueue(&first_peer_device(device)->connection->sender_work);
+
+ /* If we happen to be C_STANDALONE R_SECONDARY, just change to
+ * D_INCONSISTENT, and set all bits in the bitmap. Otherwise,
+ * try to start a resync handshake as sync target for full sync.
+ */
+ if (device->state.conn == C_STANDALONE && device->state.role == R_SECONDARY) {
+ retcode = drbd_request_state(device, NS(disk, D_INCONSISTENT));
+ if (retcode >= SS_SUCCESS) {
+ if (drbd_bitmap_io(device, &drbd_bmio_set_n_write,
+ "set_n_write from invalidate", BM_LOCKED_MASK))
+ retcode = ERR_IO_MD_DISK;
+ }
+ } else
+ retcode = drbd_request_state(device, NS(conn, C_STARTING_SYNC_T));
+ drbd_resume_io(device);
+ mutex_unlock(&adm_ctx.resource->adm_mutex);
+ put_ldev(device);
+out:
+ drbd_adm_finish(&adm_ctx, info, retcode);
+ return 0;
+}
+
+static int drbd_adm_simple_request_state(struct sk_buff *skb, struct genl_info *info,
+ union drbd_state mask, union drbd_state val)
+{
+ struct drbd_config_context adm_ctx;
+ 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;
+
+ mutex_lock(&adm_ctx.resource->adm_mutex);
+ retcode = drbd_request_state(adm_ctx.device, mask, val);
+ mutex_unlock(&adm_ctx.resource->adm_mutex);
+out:
+ drbd_adm_finish(&adm_ctx, info, retcode);
+ return 0;
+}
+
+static int drbd_bmio_set_susp_al(struct drbd_device *device) __must_hold(local)
+{
+ int rv;
+
+ rv = drbd_bmio_set_n_write(device);
+ drbd_suspend_al(device);
+ return rv;
+}
+
+int drbd_adm_invalidate_peer(struct sk_buff *skb, struct genl_info *info)
+{
+ struct drbd_config_context adm_ctx;
+ int retcode; /* drbd_ret_code, drbd_state_rv */
+ struct drbd_device *device;
+
+ 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;
+
+ device = adm_ctx.device;
+ if (!get_ldev(device)) {
+ retcode = ERR_NO_DISK;
+ goto out;
+ }
+
+ mutex_lock(&adm_ctx.resource->adm_mutex);
+
+ /* If there is still bitmap IO pending, probably because of a previous
+ * resync just being finished, wait for it before requesting a new resync.
+ * Also wait for it's after_state_ch(). */
+ drbd_suspend_io(device);
+ wait_event(device->misc_wait, !test_bit(BITMAP_IO, &device->flags));
+ drbd_flush_workqueue(&first_peer_device(device)->connection->sender_work);
+
+ /* If we happen to be C_STANDALONE R_PRIMARY, just set all bits
+ * in the bitmap. Otherwise, try to start a resync handshake
+ * as sync source for full sync.
+ */
+ if (device->state.conn == C_STANDALONE && device->state.role == R_PRIMARY) {
+ /* The peer will get a resync upon connect anyways. Just make that
+ into a full resync. */
+ retcode = drbd_request_state(device, NS(pdsk, D_INCONSISTENT));
+ if (retcode >= SS_SUCCESS) {
+ if (drbd_bitmap_io(device, &drbd_bmio_set_susp_al,
+ "set_n_write from invalidate_peer",
+ BM_LOCKED_SET_ALLOWED))
+ retcode = ERR_IO_MD_DISK;
+ }
+ } else
+ retcode = drbd_request_state(device, NS(conn, C_STARTING_SYNC_S));
+ drbd_resume_io(device);
+ mutex_unlock(&adm_ctx.resource->adm_mutex);
+ put_ldev(device);
+out:
+ drbd_adm_finish(&adm_ctx, info, retcode);
+ return 0;
+}
+
+int drbd_adm_pause_sync(struct sk_buff *skb, struct genl_info *info)
+{
+ struct drbd_config_context adm_ctx;
+ 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;
+
+ mutex_lock(&adm_ctx.resource->adm_mutex);
+ if (drbd_request_state(adm_ctx.device, NS(user_isp, 1)) == SS_NOTHING_TO_DO)
+ retcode = ERR_PAUSE_IS_SET;
+ mutex_unlock(&adm_ctx.resource->adm_mutex);
+out:
+ drbd_adm_finish(&adm_ctx, info, retcode);
+ return 0;
+}
+
+int drbd_adm_resume_sync(struct sk_buff *skb, struct genl_info *info)
+{
+ struct drbd_config_context adm_ctx;
+ union drbd_dev_state s;
+ 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;
+
+ mutex_lock(&adm_ctx.resource->adm_mutex);
+ if (drbd_request_state(adm_ctx.device, NS(user_isp, 0)) == SS_NOTHING_TO_DO) {
+ s = adm_ctx.device->state;
+ if (s.conn == C_PAUSED_SYNC_S || s.conn == C_PAUSED_SYNC_T) {
+ retcode = s.aftr_isp ? ERR_PIC_AFTER_DEP :
+ s.peer_isp ? ERR_PIC_PEER_DEP : ERR_PAUSE_IS_CLEAR;
+ } else {
+ retcode = ERR_PAUSE_IS_CLEAR;
+ }
+ }
+ mutex_unlock(&adm_ctx.resource->adm_mutex);
+out:
+ drbd_adm_finish(&adm_ctx, info, retcode);
+ return 0;
+}
+
+int drbd_adm_suspend_io(struct sk_buff *skb, struct genl_info *info)
+{
+ return drbd_adm_simple_request_state(skb, info, NS(susp, 1));
+}
+
+int drbd_adm_resume_io(struct sk_buff *skb, struct genl_info *info)
+{
+ struct drbd_config_context adm_ctx;
+ struct drbd_device *device;
+ int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
+
+ 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;
+
+ mutex_lock(&adm_ctx.resource->adm_mutex);
+ device = adm_ctx.device;
+ if (test_bit(NEW_CUR_UUID, &device->flags)) {
+ drbd_uuid_new_current(device);
+ clear_bit(NEW_CUR_UUID, &device->flags);
+ }
+ drbd_suspend_io(device);
+ retcode = drbd_request_state(device, NS3(susp, 0, susp_nod, 0, susp_fen, 0));
+ if (retcode == SS_SUCCESS) {
+ if (device->state.conn < C_CONNECTED)
+ tl_clear(first_peer_device(device)->connection);
+ if (device->state.disk == D_DISKLESS || device->state.disk == D_FAILED)
+ tl_restart(first_peer_device(device)->connection, FAIL_FROZEN_DISK_IO);
+ }
+ drbd_resume_io(device);
+ mutex_unlock(&adm_ctx.resource->adm_mutex);
+out:
+ drbd_adm_finish(&adm_ctx, info, retcode);
+ return 0;
+}
+
+int drbd_adm_outdate(struct sk_buff *skb, struct genl_info *info)
+{
+ return drbd_adm_simple_request_state(skb, info, NS(disk, D_OUTDATED));
+}
+
+static int nla_put_drbd_cfg_context(struct sk_buff *skb,
+ struct drbd_resource *resource,
+ struct drbd_connection *connection,
+ struct drbd_device *device)
+{
+ struct nlattr *nla;
+ nla = nla_nest_start(skb, DRBD_NLA_CFG_CONTEXT);
+ if (!nla)
+ goto nla_put_failure;
+ if (device &&
+ nla_put_u32(skb, T_ctx_volume, device->vnr))
+ goto nla_put_failure;
+ if (nla_put_string(skb, T_ctx_resource_name, resource->name))
+ goto nla_put_failure;
+ if (connection) {
+ if (connection->my_addr_len &&
+ nla_put(skb, T_ctx_my_addr, connection->my_addr_len, &connection->my_addr))
+ goto nla_put_failure;
+ if (connection->peer_addr_len &&
+ nla_put(skb, T_ctx_peer_addr, connection->peer_addr_len, &connection->peer_addr))
+ goto nla_put_failure;
+ }
+ nla_nest_end(skb, nla);
+ return 0;
+
+nla_put_failure:
+ if (nla)
+ nla_nest_cancel(skb, nla);
+ return -EMSGSIZE;
+}
+
+/*
+ * Return the connection of @resource if @resource has exactly one connection.
+ */
+static struct drbd_connection *the_only_connection(struct drbd_resource *resource)
+{
+ struct list_head *connections = &resource->connections;
+
+ if (list_empty(connections) || connections->next->next != connections)
+ return NULL;
+ return list_first_entry(&resource->connections, struct drbd_connection, connections);
+}
+
+static int nla_put_status_info(struct sk_buff *skb, struct drbd_device *device,
+ const struct sib_info *sib)
+{
+ struct drbd_resource *resource = device->resource;
+ struct state_info *si = NULL; /* for sizeof(si->member); */
+ struct nlattr *nla;
+ int got_ldev;
+ int err = 0;
+ int exclude_sensitive;
+
+ /* If sib != NULL, this is drbd_bcast_event, which anyone can listen
+ * to. So we better exclude_sensitive information.
+ *
+ * If sib == NULL, this is drbd_adm_get_status, executed synchronously
+ * in the context of the requesting user process. Exclude sensitive
+ * information, unless current has superuser.
+ *
+ * NOTE: for drbd_adm_get_status_all(), this is a netlink dump, and
+ * relies on the current implementation of netlink_dump(), which
+ * executes the dump callback successively from netlink_recvmsg(),
+ * always in the context of the receiving process */
+ exclude_sensitive = sib || !capable(CAP_SYS_ADMIN);
+
+ got_ldev = get_ldev(device);
+
+ /* We need to add connection name and volume number information still.
+ * Minor number is in drbd_genlmsghdr. */
+ if (nla_put_drbd_cfg_context(skb, resource, the_only_connection(resource), device))
+ goto nla_put_failure;
+
+ if (res_opts_to_skb(skb, &device->resource->res_opts, exclude_sensitive))
+ goto nla_put_failure;
+
+ rcu_read_lock();
+ if (got_ldev) {
+ struct disk_conf *disk_conf;
+
+ disk_conf = rcu_dereference(device->ldev->disk_conf);
+ err = disk_conf_to_skb(skb, disk_conf, exclude_sensitive);
+ }
+ if (!err) {
+ struct net_conf *nc;
+
+ nc = rcu_dereference(first_peer_device(device)->connection->net_conf);
+ if (nc)
+ err = net_conf_to_skb(skb, nc, exclude_sensitive);
+ }
+ rcu_read_unlock();
+ if (err)
+ goto nla_put_failure;
+
+ nla = nla_nest_start(skb, DRBD_NLA_STATE_INFO);
+ if (!nla)
+ goto nla_put_failure;
+ if (nla_put_u32(skb, T_sib_reason, sib ? sib->sib_reason : SIB_GET_STATUS_REPLY) ||
+ nla_put_u32(skb, T_current_state, device->state.i) ||
+ nla_put_u64(skb, T_ed_uuid, device->ed_uuid) ||
+ nla_put_u64(skb, T_capacity, drbd_get_capacity(device->this_bdev)) ||
+ nla_put_u64(skb, T_send_cnt, device->send_cnt) ||
+ nla_put_u64(skb, T_recv_cnt, device->recv_cnt) ||
+ nla_put_u64(skb, T_read_cnt, device->read_cnt) ||
+ nla_put_u64(skb, T_writ_cnt, device->writ_cnt) ||
+ nla_put_u64(skb, T_al_writ_cnt, device->al_writ_cnt) ||
+ nla_put_u64(skb, T_bm_writ_cnt, device->bm_writ_cnt) ||
+ nla_put_u32(skb, T_ap_bio_cnt, atomic_read(&device->ap_bio_cnt)) ||
+ nla_put_u32(skb, T_ap_pending_cnt, atomic_read(&device->ap_pending_cnt)) ||
+ nla_put_u32(skb, T_rs_pending_cnt, atomic_read(&device->rs_pending_cnt)))
+ goto nla_put_failure;
+
+ if (got_ldev) {
+ int err;
+
+ spin_lock_irq(&device->ldev->md.uuid_lock);
+ err = nla_put(skb, T_uuids, sizeof(si->uuids), device->ldev->md.uuid);
+ spin_unlock_irq(&device->ldev->md.uuid_lock);
+
+ if (err)
+ goto nla_put_failure;
+
+ if (nla_put_u32(skb, T_disk_flags, device->ldev->md.flags) ||
+ nla_put_u64(skb, T_bits_total, drbd_bm_bits(device)) ||
+ nla_put_u64(skb, T_bits_oos, drbd_bm_total_weight(device)))
+ goto nla_put_failure;
+ if (C_SYNC_SOURCE <= device->state.conn &&
+ C_PAUSED_SYNC_T >= device->state.conn) {
+ if (nla_put_u64(skb, T_bits_rs_total, device->rs_total) ||
+ nla_put_u64(skb, T_bits_rs_failed, device->rs_failed))
+ goto nla_put_failure;
+ }
+ }
+
+ if (sib) {
+ switch(sib->sib_reason) {
+ case SIB_SYNC_PROGRESS:
+ case SIB_GET_STATUS_REPLY:
+ break;
+ case SIB_STATE_CHANGE:
+ if (nla_put_u32(skb, T_prev_state, sib->os.i) ||
+ nla_put_u32(skb, T_new_state, sib->ns.i))
+ goto nla_put_failure;
+ break;
+ case SIB_HELPER_POST:
+ if (nla_put_u32(skb, T_helper_exit_code,
+ sib->helper_exit_code))
+ goto nla_put_failure;
+ /* fall through */
+ case SIB_HELPER_PRE:
+ if (nla_put_string(skb, T_helper, sib->helper_name))
+ goto nla_put_failure;
+ break;
+ }
+ }
+ nla_nest_end(skb, nla);
+
+ if (0)
+nla_put_failure:
+ err = -EMSGSIZE;
+ if (got_ldev)
+ put_ldev(device);
+ return err;
+}
+
+int drbd_adm_get_status(struct sk_buff *skb, struct genl_info *info)
+{
+ struct drbd_config_context adm_ctx;
+ enum drbd_ret_code retcode;
+ 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;
+
+ err = nla_put_status_info(adm_ctx.reply_skb, adm_ctx.device, NULL);
+ if (err) {
+ nlmsg_free(adm_ctx.reply_skb);
+ return err;
+ }
+out:
+ drbd_adm_finish(&adm_ctx, info, retcode);
+ return 0;
+}
+
+static int get_one_status(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct drbd_device *device;
+ struct drbd_genlmsghdr *dh;
+ struct drbd_resource *pos = (struct drbd_resource *)cb->args[0];
+ struct drbd_resource *resource = NULL;
+ struct drbd_resource *tmp;
+ unsigned volume = cb->args[1];
+
+ /* Open coded, deferred, iteration:
+ * for_each_resource_safe(resource, tmp, &drbd_resources) {
+ * connection = "first connection of resource or undefined";
+ * idr_for_each_entry(&resource->devices, device, i) {
+ * ...
+ * }
+ * }
+ * where resource is cb->args[0];
+ * and i is cb->args[1];
+ *
+ * cb->args[2] indicates if we shall loop over all resources,
+ * or just dump all volumes of a single resource.
+ *
+ * This may miss entries inserted after this dump started,
+ * or entries deleted before they are reached.
+ *
+ * We need to make sure the device won't disappear while
+ * we are looking at it, and revalidate our iterators
+ * on each iteration.
+ */
+
+ /* synchronize with conn_create()/drbd_destroy_connection() */
+ rcu_read_lock();
+ /* revalidate iterator position */
+ for_each_resource_rcu(tmp, &drbd_resources) {
+ if (pos == NULL) {
+ /* first iteration */
+ pos = tmp;
+ resource = pos;
+ break;
+ }
+ if (tmp == pos) {
+ resource = pos;
+ break;
+ }
+ }
+ if (resource) {
+next_resource:
+ device = idr_get_next(&resource->devices, &volume);
+ if (!device) {
+ /* No more volumes to dump on this resource.
+ * Advance resource iterator. */
+ pos = list_entry_rcu(resource->resources.next,
+ struct drbd_resource, resources);
+ /* Did we dump any volume of this resource yet? */
+ if (volume != 0) {
+ /* If we reached the end of the list,
+ * or only a single resource dump was requested,
+ * we are done. */
+ if (&pos->resources == &drbd_resources || cb->args[2])
+ goto out;
+ volume = 0;
+ resource = pos;
+ goto next_resource;
+ }
+ }
+
+ dh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq, &drbd_genl_family,
+ NLM_F_MULTI, DRBD_ADM_GET_STATUS);
+ if (!dh)
+ goto out;
+
+ if (!device) {
+ /* This is a connection without a single volume.
+ * Suprisingly enough, it may have a network
+ * configuration. */
+ struct drbd_connection *connection;
+
+ dh->minor = -1U;
+ dh->ret_code = NO_ERROR;
+ connection = the_only_connection(resource);
+ if (nla_put_drbd_cfg_context(skb, resource, connection, NULL))
+ goto cancel;
+ if (connection) {
+ struct net_conf *nc;
+
+ nc = rcu_dereference(connection->net_conf);
+ if (nc && net_conf_to_skb(skb, nc, 1) != 0)
+ goto cancel;
+ }
+ goto done;
+ }
+
+ D_ASSERT(device, device->vnr == volume);
+ D_ASSERT(device, device->resource == resource);
+
+ dh->minor = device_to_minor(device);
+ dh->ret_code = NO_ERROR;
+
+ if (nla_put_status_info(skb, device, NULL)) {
+cancel:
+ genlmsg_cancel(skb, dh);
+ goto out;
+ }
+done:
+ genlmsg_end(skb, dh);
+ }
+
+out:
+ rcu_read_unlock();
+ /* where to start the next iteration */
+ cb->args[0] = (long)pos;
+ cb->args[1] = (pos == resource) ? volume + 1 : 0;
+
+ /* No more resources/volumes/minors found results in an empty skb.
+ * Which will terminate the dump. */
+ return skb->len;
+}
+
+/*
+ * Request status of all resources, or of all volumes within a single resource.
+ *
+ * This is a dump, as the answer may not fit in a single reply skb otherwise.
+ * Which means we cannot use the family->attrbuf or other such members, because
+ * dump is NOT protected by the genl_lock(). During dump, we only have access
+ * to the incoming skb, and need to opencode "parsing" of the nlattr payload.
+ *
+ * Once things are setup properly, we call into get_one_status().
+ */
+int drbd_adm_get_status_all(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ const unsigned hdrlen = GENL_HDRLEN + GENL_MAGIC_FAMILY_HDRSZ;
+ struct nlattr *nla;
+ const char *resource_name;
+ struct drbd_resource *resource;
+ int maxtype;
+
+ /* Is this a followup call? */
+ if (cb->args[0]) {
+ /* ... of a single resource dump,
+ * and the resource iterator has been advanced already? */
+ if (cb->args[2] && cb->args[2] != cb->args[0])
+ return 0; /* DONE. */
+ goto dump;
+ }
+
+ /* First call (from netlink_dump_start). We need to figure out
+ * which resource(s) the user wants us to dump. */
+ nla = nla_find(nlmsg_attrdata(cb->nlh, hdrlen),
+ nlmsg_attrlen(cb->nlh, hdrlen),
+ DRBD_NLA_CFG_CONTEXT);
+
+ /* No explicit context given. Dump all. */
+ if (!nla)
+ goto dump;
+ maxtype = ARRAY_SIZE(drbd_cfg_context_nl_policy) - 1;
+ nla = drbd_nla_find_nested(maxtype, nla, __nla_type(T_ctx_resource_name));
+ if (IS_ERR(nla))
+ return PTR_ERR(nla);
+ /* context given, but no name present? */
+ if (!nla)
+ return -EINVAL;
+ resource_name = nla_data(nla);
+ if (!*resource_name)
+ return -ENODEV;
+ resource = drbd_find_resource(resource_name);
+ if (!resource)
+ return -ENODEV;
+
+ kref_put(&resource->kref, drbd_destroy_resource); /* get_one_status() revalidates the resource */
+
+ /* prime iterators, and set "filter" mode mark:
+ * only dump this connection. */
+ cb->args[0] = (long)resource;
+ /* cb->args[1] = 0; passed in this way. */
+ cb->args[2] = (long)resource;
+
+dump:
+ return get_one_status(skb, cb);
+}
+
+int drbd_adm_get_timeout_type(struct sk_buff *skb, struct genl_info *info)
+{
+ struct drbd_config_context adm_ctx;
+ enum drbd_ret_code retcode;
+ struct timeout_parms tp;
+ 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;
+
+ tp.timeout_type =
+ adm_ctx.device->state.pdsk == D_OUTDATED ? UT_PEER_OUTDATED :
+ test_bit(USE_DEGR_WFC_T, &adm_ctx.device->flags) ? UT_DEGRADED :
+ UT_DEFAULT;
+
+ err = timeout_parms_to_priv_skb(adm_ctx.reply_skb, &tp);
+ if (err) {
+ nlmsg_free(adm_ctx.reply_skb);
+ return err;
+ }
+out:
+ drbd_adm_finish(&adm_ctx, info, retcode);
+ return 0;
+}
+
+int drbd_adm_start_ov(struct sk_buff *skb, struct genl_info *info)
+{
+ struct drbd_config_context adm_ctx;
+ struct drbd_device *device;
+ enum drbd_ret_code retcode;
+ struct start_ov_parms parms;
+
+ 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;
+
+ device = adm_ctx.device;
+
+ /* resume from last known position, if possible */
+ parms.ov_start_sector = device->ov_start_sector;
+ parms.ov_stop_sector = ULLONG_MAX;
+ if (info->attrs[DRBD_NLA_START_OV_PARMS]) {
+ int err = start_ov_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);
+
+ /* w_make_ov_request expects position to be aligned */
+ device->ov_start_sector = parms.ov_start_sector & ~(BM_SECT_PER_BIT-1);
+ device->ov_stop_sector = parms.ov_stop_sector;
+
+ /* If there is still bitmap IO pending, e.g. previous resync or verify
+ * just being finished, wait for it before requesting a new resync. */
+ drbd_suspend_io(device);
+ wait_event(device->misc_wait, !test_bit(BITMAP_IO, &device->flags));
+ retcode = drbd_request_state(device, NS(conn, C_VERIFY_S));
+ drbd_resume_io(device);
+
+ mutex_unlock(&adm_ctx.resource->adm_mutex);
+out:
+ drbd_adm_finish(&adm_ctx, info, retcode);
+ return 0;
+}
+
+
+int drbd_adm_new_c_uuid(struct sk_buff *skb, struct genl_info *info)
+{
+ struct drbd_config_context adm_ctx;
+ struct drbd_device *device;
+ enum drbd_ret_code retcode;
+ int skip_initial_sync = 0;
+ int err;
+ struct new_c_uuid_parms args;
+
+ 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_nolock;
+
+ device = adm_ctx.device;
+ memset(&args, 0, sizeof(args));
+ if (info->attrs[DRBD_NLA_NEW_C_UUID_PARMS]) {
+ err = new_c_uuid_parms_from_attrs(&args, info);
+ if (err) {
+ retcode = ERR_MANDATORY_TAG;
+ drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
+ goto out_nolock;
+ }
+ }
+
+ mutex_lock(&adm_ctx.resource->adm_mutex);
+ mutex_lock(device->state_mutex); /* Protects us against serialized state changes. */
+
+ if (!get_ldev(device)) {
+ retcode = ERR_NO_DISK;
+ goto out;
+ }
+
+ /* this is "skip initial sync", assume to be clean */
+ if (device->state.conn == C_CONNECTED &&
+ first_peer_device(device)->connection->agreed_pro_version >= 90 &&
+ device->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && args.clear_bm) {
+ drbd_info(device, "Preparing to skip initial sync\n");
+ skip_initial_sync = 1;
+ } else if (device->state.conn != C_STANDALONE) {
+ retcode = ERR_CONNECTED;
+ goto out_dec;
+ }
+
+ drbd_uuid_set(device, UI_BITMAP, 0); /* Rotate UI_BITMAP to History 1, etc... */
+ drbd_uuid_new_current(device); /* New current, previous to UI_BITMAP */
+
+ if (args.clear_bm) {
+ err = drbd_bitmap_io(device, &drbd_bmio_clear_n_write,
+ "clear_n_write from new_c_uuid", BM_LOCKED_MASK);
+ if (err) {
+ drbd_err(device, "Writing bitmap failed with %d\n", err);
+ retcode = ERR_IO_MD_DISK;
+ }
+ if (skip_initial_sync) {
+ drbd_send_uuids_skip_initial_sync(first_peer_device(device));
+ _drbd_uuid_set(device, UI_BITMAP, 0);
+ drbd_print_uuids(device, "cleared bitmap UUID");
+ spin_lock_irq(&device->resource->req_lock);
+ _drbd_set_state(_NS2(device, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE),
+ CS_VERBOSE, NULL);
+ spin_unlock_irq(&device->resource->req_lock);
+ }
+ }
+
+ drbd_md_sync(device);
+out_dec:
+ put_ldev(device);
+out:
+ mutex_unlock(device->state_mutex);
+ mutex_unlock(&adm_ctx.resource->adm_mutex);
+out_nolock:
+ drbd_adm_finish(&adm_ctx, info, retcode);
+ return 0;
+}
+
+static enum drbd_ret_code
+drbd_check_resource_name(struct drbd_config_context *adm_ctx)
+{
+ const char *name = adm_ctx->resource_name;
+ if (!name || !name[0]) {
+ drbd_msg_put_info(adm_ctx->reply_skb, "resource name missing");
+ return ERR_MANDATORY_TAG;
+ }
+ /* if we want to use these in sysfs/configfs/debugfs some day,
+ * we must not allow slashes */
+ if (strchr(name, '/')) {
+ drbd_msg_put_info(adm_ctx->reply_skb, "invalid resource name");
+ return ERR_INVALID_REQUEST;
+ }
+ return NO_ERROR;
+}
+
+int drbd_adm_new_resource(struct sk_buff *skb, struct genl_info *info)
+{
+ struct drbd_config_context adm_ctx;
+ enum drbd_ret_code retcode;
+ struct res_opts res_opts;
+ int err;
+
+ retcode = drbd_adm_prepare(&adm_ctx, skb, info, 0);
+ if (!adm_ctx.reply_skb)
+ return retcode;
+ if (retcode != NO_ERROR)
+ goto out;
+
+ set_res_opts_defaults(&res_opts);
+ err = res_opts_from_attrs(&res_opts, info);
+ if (err && err != -ENOMSG) {
+ retcode = ERR_MANDATORY_TAG;
+ drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err));
+ goto out;
+ }
+
+ retcode = drbd_check_resource_name(&adm_ctx);
+ if (retcode != NO_ERROR)
+ goto out;
+
+ if (adm_ctx.resource) {
+ if (info->nlhdr->nlmsg_flags & NLM_F_EXCL) {
+ retcode = ERR_INVALID_REQUEST;
+ drbd_msg_put_info(adm_ctx.reply_skb, "resource exists");
+ }
+ /* else: still NO_ERROR */
+ goto out;
+ }
+
+ /* not yet safe for genl_family.parallel_ops */
+ if (!conn_create(adm_ctx.resource_name, &res_opts))
+ retcode = ERR_NOMEM;
+out:
+ drbd_adm_finish(&adm_ctx, info, retcode);
+ return 0;
+}
+
+int drbd_adm_new_minor(struct sk_buff *skb, struct genl_info *info)
+{
+ struct drbd_config_context adm_ctx;
+ struct drbd_genlmsghdr *dh = info->userhdr;
+ enum drbd_ret_code retcode;
+
+ 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 (dh->minor > MINORMASK) {
+ drbd_msg_put_info(adm_ctx.reply_skb, "requested minor out of range");
+ retcode = ERR_INVALID_REQUEST;
+ goto out;
+ }
+ if (adm_ctx.volume > DRBD_VOLUME_MAX) {
+ drbd_msg_put_info(adm_ctx.reply_skb, "requested volume id out of range");
+ retcode = ERR_INVALID_REQUEST;
+ goto out;
+ }
+
+ /* drbd_adm_prepare made sure already
+ * that first_peer_device(device)->connection and device->vnr match the request. */
+ if (adm_ctx.device) {
+ if (info->nlhdr->nlmsg_flags & NLM_F_EXCL)
+ retcode = ERR_MINOR_OR_VOLUME_EXISTS;
+ /* else: still NO_ERROR */
+ goto out;
+ }
+
+ mutex_lock(&adm_ctx.resource->adm_mutex);
+ retcode = drbd_create_device(&adm_ctx, dh->minor);
+ mutex_unlock(&adm_ctx.resource->adm_mutex);
+out:
+ drbd_adm_finish(&adm_ctx, info, retcode);
+ return 0;
+}
+
+static enum drbd_ret_code adm_del_minor(struct drbd_device *device)
+{
+ if (device->state.disk == D_DISKLESS &&
+ /* no need to be device->state.conn == C_STANDALONE &&
+ * we may want to delete a minor from a live replication group.
+ */
+ device->state.role == R_SECONDARY) {
+ _drbd_request_state(device, NS(conn, C_WF_REPORT_PARAMS),
+ CS_VERBOSE + CS_WAIT_COMPLETE);
+ drbd_delete_device(device);
+ return NO_ERROR;
+ } else
+ return ERR_MINOR_CONFIGURED;
+}
+
+int drbd_adm_del_minor(struct sk_buff *skb, struct genl_info *info)
+{
+ struct drbd_config_context adm_ctx;
+ 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;
+
+ mutex_lock(&adm_ctx.resource->adm_mutex);
+ retcode = adm_del_minor(adm_ctx.device);
+ mutex_unlock(&adm_ctx.resource->adm_mutex);
+out:
+ drbd_adm_finish(&adm_ctx, info, retcode);
+ return 0;
+}
+
+static int adm_del_resource(struct drbd_resource *resource)
+{
+ struct drbd_connection *connection;
+
+ for_each_connection(connection, resource) {
+ if (connection->cstate > C_STANDALONE)
+ return ERR_NET_CONFIGURED;
+ }
+ if (!idr_is_empty(&resource->devices))
+ return ERR_RES_IN_USE;
+
+ list_del_rcu(&resource->resources);
+ /* Make sure all threads have actually stopped: state handling only
+ * does drbd_thread_stop_nowait(). */
+ list_for_each_entry(connection, &resource->connections, connections)
+ drbd_thread_stop(&connection->worker);
+ synchronize_rcu();
+ drbd_free_resource(resource);
+ return NO_ERROR;
+}
+
+int drbd_adm_down(struct sk_buff *skb, struct genl_info *info)
+{
+ struct drbd_config_context adm_ctx;
+ struct drbd_resource *resource;
+ struct drbd_connection *connection;
+ struct drbd_device *device;
+ int retcode; /* enum drbd_ret_code rsp. enum drbd_state_rv */
+ unsigned i;
+
+ retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_RESOURCE);
+ if (!adm_ctx.reply_skb)
+ return retcode;
+ if (retcode != NO_ERROR)
+ goto finish;
+
+ resource = adm_ctx.resource;
+ mutex_lock(&resource->adm_mutex);
+ /* demote */
+ for_each_connection(connection, resource) {
+ struct drbd_peer_device *peer_device;
+
+ idr_for_each_entry(&connection->peer_devices, peer_device, i) {
+ retcode = drbd_set_role(peer_device->device, R_SECONDARY, 0);
+ if (retcode < SS_SUCCESS) {
+ drbd_msg_put_info(adm_ctx.reply_skb, "failed to demote");
+ goto out;
+ }
+ }
+
+ retcode = conn_try_disconnect(connection, 0);
+ if (retcode < SS_SUCCESS) {
+ drbd_msg_put_info(adm_ctx.reply_skb, "failed to disconnect");
+ goto out;
+ }
+ }
+
+ /* detach */
+ idr_for_each_entry(&resource->devices, device, i) {
+ retcode = adm_detach(device, 0);
+ if (retcode < SS_SUCCESS || retcode > NO_ERROR) {
+ drbd_msg_put_info(adm_ctx.reply_skb, "failed to detach");
+ goto out;
+ }
+ }
+
+ /* delete volumes */
+ idr_for_each_entry(&resource->devices, device, i) {
+ retcode = adm_del_minor(device);
+ if (retcode != NO_ERROR) {
+ /* "can not happen" */
+ drbd_msg_put_info(adm_ctx.reply_skb, "failed to delete volume");
+ goto out;
+ }
+ }
+
+ retcode = adm_del_resource(resource);
+out:
+ mutex_unlock(&resource->adm_mutex);
+finish:
+ drbd_adm_finish(&adm_ctx, info, retcode);
+ return 0;
+}
+
+int drbd_adm_del_resource(struct sk_buff *skb, struct genl_info *info)
+{
+ struct drbd_config_context adm_ctx;
+ struct drbd_resource *resource;
+ enum drbd_ret_code retcode;
+
+ retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_RESOURCE);
+ if (!adm_ctx.reply_skb)
+ return retcode;
+ if (retcode != NO_ERROR)
+ goto finish;
+ resource = adm_ctx.resource;
+
+ mutex_lock(&resource->adm_mutex);
+ retcode = adm_del_resource(resource);
+ mutex_unlock(&resource->adm_mutex);
+finish:
+ drbd_adm_finish(&adm_ctx, info, retcode);
+ return 0;
+}
+
+void drbd_bcast_event(struct drbd_device *device, const struct sib_info *sib)
+{
+ static atomic_t drbd_genl_seq = ATOMIC_INIT(2); /* two. */
+ struct sk_buff *msg;
+ struct drbd_genlmsghdr *d_out;
+ unsigned seq;
+ int err = -ENOMEM;
+
+ seq = atomic_inc_return(&drbd_genl_seq);
+ msg = genlmsg_new(NLMSG_GOODSIZE, GFP_NOIO);
+ if (!msg)
+ goto failed;
+
+ err = -EMSGSIZE;
+ d_out = genlmsg_put(msg, 0, seq, &drbd_genl_family, 0, DRBD_EVENT);
+ if (!d_out) /* cannot happen, but anyways. */
+ goto nla_put_failure;
+ d_out->minor = device_to_minor(device);
+ d_out->ret_code = NO_ERROR;
+
+ if (nla_put_status_info(msg, device, sib))
+ goto nla_put_failure;
+ genlmsg_end(msg, d_out);
+ err = drbd_genl_multicast_events(msg, 0);
+ /* msg has been consumed or freed in netlink_broadcast() */
+ if (err && err != -ESRCH)
+ goto failed;
+
+ return;
+
+nla_put_failure:
+ nlmsg_free(msg);
+failed:
+ drbd_err(device, "Error %d while broadcasting event. "
+ "Event seq:%u sib_reason:%u\n",
+ err, seq, sib->sib_reason);
+}