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5010 lines
147 KiB
5010 lines
147 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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drbd_nl.c |
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This file is part of DRBD by Philipp Reisner and Lars Ellenberg. |
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Copyright (C) 2001-2008, LINBIT Information Technologies GmbH. |
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Copyright (C) 1999-2008, Philipp Reisner <[email protected]>. |
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Copyright (C) 2002-2008, Lars Ellenberg <[email protected]>. |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/module.h> |
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#include <linux/drbd.h> |
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#include <linux/in.h> |
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#include <linux/fs.h> |
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#include <linux/file.h> |
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#include <linux/slab.h> |
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#include <linux/blkpg.h> |
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#include <linux/cpumask.h> |
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#include "drbd_int.h" |
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#include "drbd_protocol.h" |
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#include "drbd_req.h" |
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#include "drbd_state_change.h" |
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#include <asm/unaligned.h> |
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#include <linux/drbd_limits.h> |
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#include <linux/kthread.h> |
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#include <net/genetlink.h> |
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/* .doit */ |
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// int drbd_adm_create_resource(struct sk_buff *skb, struct genl_info *info); |
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// int drbd_adm_delete_resource(struct sk_buff *skb, struct genl_info *info); |
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int drbd_adm_new_minor(struct sk_buff *skb, struct genl_info *info); |
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int drbd_adm_del_minor(struct sk_buff *skb, struct genl_info *info); |
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int drbd_adm_new_resource(struct sk_buff *skb, struct genl_info *info); |
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int drbd_adm_del_resource(struct sk_buff *skb, struct genl_info *info); |
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int drbd_adm_down(struct sk_buff *skb, struct genl_info *info); |
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int drbd_adm_set_role(struct sk_buff *skb, struct genl_info *info); |
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int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info); |
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int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info); |
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int drbd_adm_detach(struct sk_buff *skb, struct genl_info *info); |
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int drbd_adm_connect(struct sk_buff *skb, struct genl_info *info); |
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int drbd_adm_net_opts(struct sk_buff *skb, struct genl_info *info); |
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int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info); |
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int drbd_adm_start_ov(struct sk_buff *skb, struct genl_info *info); |
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int drbd_adm_new_c_uuid(struct sk_buff *skb, struct genl_info *info); |
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int drbd_adm_disconnect(struct sk_buff *skb, struct genl_info *info); |
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int drbd_adm_invalidate(struct sk_buff *skb, struct genl_info *info); |
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int drbd_adm_invalidate_peer(struct sk_buff *skb, struct genl_info *info); |
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int drbd_adm_pause_sync(struct sk_buff *skb, struct genl_info *info); |
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int drbd_adm_resume_sync(struct sk_buff *skb, struct genl_info *info); |
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int drbd_adm_suspend_io(struct sk_buff *skb, struct genl_info *info); |
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int drbd_adm_resume_io(struct sk_buff *skb, struct genl_info *info); |
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int drbd_adm_outdate(struct sk_buff *skb, struct genl_info *info); |
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int drbd_adm_resource_opts(struct sk_buff *skb, struct genl_info *info); |
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int drbd_adm_get_status(struct sk_buff *skb, struct genl_info *info); |
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int drbd_adm_get_timeout_type(struct sk_buff *skb, struct genl_info *info); |
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/* .dumpit */ |
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int drbd_adm_get_status_all(struct sk_buff *skb, struct netlink_callback *cb); |
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int drbd_adm_dump_resources(struct sk_buff *skb, struct netlink_callback *cb); |
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int drbd_adm_dump_devices(struct sk_buff *skb, struct netlink_callback *cb); |
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int drbd_adm_dump_devices_done(struct netlink_callback *cb); |
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int drbd_adm_dump_connections(struct sk_buff *skb, struct netlink_callback *cb); |
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int drbd_adm_dump_connections_done(struct netlink_callback *cb); |
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int drbd_adm_dump_peer_devices(struct sk_buff *skb, struct netlink_callback *cb); |
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int drbd_adm_dump_peer_devices_done(struct netlink_callback *cb); |
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int drbd_adm_get_initial_state(struct sk_buff *skb, struct netlink_callback *cb); |
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#include <linux/drbd_genl_api.h> |
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#include "drbd_nla.h" |
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#include <linux/genl_magic_func.h> |
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static atomic_t drbd_genl_seq = ATOMIC_INIT(2); /* two. */ |
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static atomic_t notify_genl_seq = ATOMIC_INIT(2); /* two. */ |
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DEFINE_MUTEX(notification_mutex); |
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/* used blkdev_get_by_path, to claim our meta data device(s) */ |
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static char *drbd_m_holder = "Hands off! this is DRBD's meta data device."; |
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static void drbd_adm_send_reply(struct sk_buff *skb, struct genl_info *info) |
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{ |
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genlmsg_end(skb, genlmsg_data(nlmsg_data(nlmsg_hdr(skb)))); |
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if (genlmsg_reply(skb, info)) |
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pr_err("error sending genl reply\n"); |
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} |
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/* Used on a fresh "drbd_adm_prepare"d reply_skb, this cannot fail: The only |
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* reason it could fail was no space in skb, and there are 4k available. */ |
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static int drbd_msg_put_info(struct sk_buff *skb, const char *info) |
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{ |
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struct nlattr *nla; |
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int err = -EMSGSIZE; |
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if (!info || !info[0]) |
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return 0; |
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nla = nla_nest_start_noflag(skb, DRBD_NLA_CFG_REPLY); |
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if (!nla) |
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return err; |
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err = nla_put_string(skb, T_info_text, info); |
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if (err) { |
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nla_nest_cancel(skb, nla); |
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return err; |
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} else |
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nla_nest_end(skb, nla); |
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return 0; |
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} |
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__printf(2, 3) |
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static int drbd_msg_sprintf_info(struct sk_buff *skb, const char *fmt, ...) |
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{ |
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va_list args; |
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struct nlattr *nla, *txt; |
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int err = -EMSGSIZE; |
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int len; |
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nla = nla_nest_start_noflag(skb, DRBD_NLA_CFG_REPLY); |
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if (!nla) |
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return err; |
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txt = nla_reserve(skb, T_info_text, 256); |
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if (!txt) { |
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nla_nest_cancel(skb, nla); |
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return err; |
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} |
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va_start(args, fmt); |
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len = vscnprintf(nla_data(txt), 256, fmt, args); |
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va_end(args); |
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/* maybe: retry with larger reserve, if truncated */ |
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txt->nla_len = nla_attr_size(len+1); |
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nlmsg_trim(skb, (char*)txt + NLA_ALIGN(txt->nla_len)); |
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nla_nest_end(skb, nla); |
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return 0; |
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} |
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/* This would be a good candidate for a "pre_doit" hook, |
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* and per-family private info->pointers. |
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* But we need to stay compatible with older kernels. |
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* If it returns successfully, adm_ctx members are valid. |
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* |
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* At this point, we still rely on the global genl_lock(). |
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* If we want to avoid that, and allow "genl_family.parallel_ops", we may need |
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* to add additional synchronization against object destruction/modification. |
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*/ |
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#define DRBD_ADM_NEED_MINOR 1 |
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#define DRBD_ADM_NEED_RESOURCE 2 |
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#define DRBD_ADM_NEED_CONNECTION 4 |
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static int drbd_adm_prepare(struct drbd_config_context *adm_ctx, |
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struct sk_buff *skb, struct genl_info *info, unsigned flags) |
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{ |
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struct drbd_genlmsghdr *d_in = info->userhdr; |
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const u8 cmd = info->genlhdr->cmd; |
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int err; |
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memset(adm_ctx, 0, sizeof(*adm_ctx)); |
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/* genl_rcv_msg only checks for CAP_NET_ADMIN on "GENL_ADMIN_PERM" :( */ |
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if (cmd != DRBD_ADM_GET_STATUS && !capable(CAP_NET_ADMIN)) |
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return -EPERM; |
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adm_ctx->reply_skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
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if (!adm_ctx->reply_skb) { |
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err = -ENOMEM; |
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goto fail; |
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} |
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adm_ctx->reply_dh = genlmsg_put_reply(adm_ctx->reply_skb, |
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info, &drbd_genl_family, 0, cmd); |
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/* put of a few bytes into a fresh skb of >= 4k will always succeed. |
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* but anyways */ |
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if (!adm_ctx->reply_dh) { |
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err = -ENOMEM; |
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goto fail; |
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} |
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adm_ctx->reply_dh->minor = d_in->minor; |
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adm_ctx->reply_dh->ret_code = NO_ERROR; |
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adm_ctx->volume = VOLUME_UNSPECIFIED; |
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if (info->attrs[DRBD_NLA_CFG_CONTEXT]) { |
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struct nlattr *nla; |
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/* parse and validate only */ |
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err = drbd_cfg_context_from_attrs(NULL, info); |
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if (err) |
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goto fail; |
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/* It was present, and valid, |
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* copy it over to the reply skb. */ |
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err = nla_put_nohdr(adm_ctx->reply_skb, |
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info->attrs[DRBD_NLA_CFG_CONTEXT]->nla_len, |
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info->attrs[DRBD_NLA_CFG_CONTEXT]); |
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if (err) |
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goto fail; |
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/* and assign stuff to the adm_ctx */ |
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nla = nested_attr_tb[__nla_type(T_ctx_volume)]; |
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if (nla) |
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adm_ctx->volume = nla_get_u32(nla); |
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nla = nested_attr_tb[__nla_type(T_ctx_resource_name)]; |
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if (nla) |
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adm_ctx->resource_name = nla_data(nla); |
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adm_ctx->my_addr = nested_attr_tb[__nla_type(T_ctx_my_addr)]; |
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adm_ctx->peer_addr = nested_attr_tb[__nla_type(T_ctx_peer_addr)]; |
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if ((adm_ctx->my_addr && |
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nla_len(adm_ctx->my_addr) > sizeof(adm_ctx->connection->my_addr)) || |
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(adm_ctx->peer_addr && |
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nla_len(adm_ctx->peer_addr) > sizeof(adm_ctx->connection->peer_addr))) { |
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err = -EINVAL; |
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goto fail; |
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} |
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} |
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adm_ctx->minor = d_in->minor; |
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adm_ctx->device = minor_to_device(d_in->minor); |
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/* We are protected by the global genl_lock(). |
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* But we may explicitly drop it/retake it in drbd_adm_set_role(), |
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* so make sure this object stays around. */ |
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if (adm_ctx->device) |
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kref_get(&adm_ctx->device->kref); |
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if (adm_ctx->resource_name) { |
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adm_ctx->resource = drbd_find_resource(adm_ctx->resource_name); |
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} |
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if (!adm_ctx->device && (flags & DRBD_ADM_NEED_MINOR)) { |
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drbd_msg_put_info(adm_ctx->reply_skb, "unknown minor"); |
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return ERR_MINOR_INVALID; |
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} |
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if (!adm_ctx->resource && (flags & DRBD_ADM_NEED_RESOURCE)) { |
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drbd_msg_put_info(adm_ctx->reply_skb, "unknown resource"); |
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if (adm_ctx->resource_name) |
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return ERR_RES_NOT_KNOWN; |
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return ERR_INVALID_REQUEST; |
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} |
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if (flags & DRBD_ADM_NEED_CONNECTION) { |
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if (adm_ctx->resource) { |
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drbd_msg_put_info(adm_ctx->reply_skb, "no resource name expected"); |
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return ERR_INVALID_REQUEST; |
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} |
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if (adm_ctx->device) { |
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drbd_msg_put_info(adm_ctx->reply_skb, "no minor number expected"); |
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return ERR_INVALID_REQUEST; |
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} |
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if (adm_ctx->my_addr && adm_ctx->peer_addr) |
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adm_ctx->connection = conn_get_by_addrs(nla_data(adm_ctx->my_addr), |
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nla_len(adm_ctx->my_addr), |
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nla_data(adm_ctx->peer_addr), |
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nla_len(adm_ctx->peer_addr)); |
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if (!adm_ctx->connection) { |
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drbd_msg_put_info(adm_ctx->reply_skb, "unknown connection"); |
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return ERR_INVALID_REQUEST; |
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} |
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} |
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/* some more paranoia, if the request was over-determined */ |
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if (adm_ctx->device && adm_ctx->resource && |
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adm_ctx->device->resource != adm_ctx->resource) { |
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pr_warn("request: minor=%u, resource=%s; but that minor belongs to resource %s\n", |
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adm_ctx->minor, adm_ctx->resource->name, |
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adm_ctx->device->resource->name); |
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drbd_msg_put_info(adm_ctx->reply_skb, "minor exists in different resource"); |
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return ERR_INVALID_REQUEST; |
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} |
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if (adm_ctx->device && |
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adm_ctx->volume != VOLUME_UNSPECIFIED && |
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adm_ctx->volume != adm_ctx->device->vnr) { |
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pr_warn("request: minor=%u, volume=%u; but that minor is volume %u in %s\n", |
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adm_ctx->minor, adm_ctx->volume, |
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adm_ctx->device->vnr, adm_ctx->device->resource->name); |
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drbd_msg_put_info(adm_ctx->reply_skb, "minor exists as different volume"); |
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return ERR_INVALID_REQUEST; |
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} |
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/* still, provide adm_ctx->resource always, if possible. */ |
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if (!adm_ctx->resource) { |
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adm_ctx->resource = adm_ctx->device ? adm_ctx->device->resource |
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: adm_ctx->connection ? adm_ctx->connection->resource : NULL; |
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if (adm_ctx->resource) |
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kref_get(&adm_ctx->resource->kref); |
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} |
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return NO_ERROR; |
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fail: |
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nlmsg_free(adm_ctx->reply_skb); |
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adm_ctx->reply_skb = NULL; |
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return err; |
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} |
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static int drbd_adm_finish(struct drbd_config_context *adm_ctx, |
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struct genl_info *info, int retcode) |
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{ |
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if (adm_ctx->device) { |
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kref_put(&adm_ctx->device->kref, drbd_destroy_device); |
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adm_ctx->device = NULL; |
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} |
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if (adm_ctx->connection) { |
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kref_put(&adm_ctx->connection->kref, &drbd_destroy_connection); |
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adm_ctx->connection = NULL; |
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} |
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if (adm_ctx->resource) { |
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kref_put(&adm_ctx->resource->kref, drbd_destroy_resource); |
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adm_ctx->resource = NULL; |
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} |
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if (!adm_ctx->reply_skb) |
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return -ENOMEM; |
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adm_ctx->reply_dh->ret_code = retcode; |
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drbd_adm_send_reply(adm_ctx->reply_skb, info); |
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return 0; |
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} |
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static void setup_khelper_env(struct drbd_connection *connection, char **envp) |
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{ |
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char *afs; |
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/* FIXME: A future version will not allow this case. */ |
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if (connection->my_addr_len == 0 || connection->peer_addr_len == 0) |
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return; |
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switch (((struct sockaddr *)&connection->peer_addr)->sa_family) { |
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case AF_INET6: |
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afs = "ipv6"; |
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snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI6", |
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&((struct sockaddr_in6 *)&connection->peer_addr)->sin6_addr); |
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break; |
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case AF_INET: |
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afs = "ipv4"; |
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snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI4", |
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&((struct sockaddr_in *)&connection->peer_addr)->sin_addr); |
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break; |
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default: |
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afs = "ssocks"; |
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snprintf(envp[4], 60, "DRBD_PEER_ADDRESS=%pI4", |
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&((struct sockaddr_in *)&connection->peer_addr)->sin_addr); |
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} |
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snprintf(envp[3], 20, "DRBD_PEER_AF=%s", afs); |
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} |
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int drbd_khelper(struct drbd_device *device, char *cmd) |
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{ |
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char *envp[] = { "HOME=/", |
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"TERM=linux", |
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"PATH=/sbin:/usr/sbin:/bin:/usr/bin", |
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(char[20]) { }, /* address family */ |
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(char[60]) { }, /* address */ |
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NULL }; |
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char mb[14]; |
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char *argv[] = {drbd_usermode_helper, cmd, mb, NULL }; |
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struct drbd_connection *connection = first_peer_device(device)->connection; |
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struct sib_info sib; |
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int ret; |
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if (current == connection->worker.task) |
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set_bit(CALLBACK_PENDING, &connection->flags); |
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snprintf(mb, 14, "minor-%d", device_to_minor(device)); |
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setup_khelper_env(connection, envp); |
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/* The helper may take some time. |
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* write out any unsynced meta data changes now */ |
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drbd_md_sync(device); |
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drbd_info(device, "helper command: %s %s %s\n", drbd_usermode_helper, cmd, mb); |
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sib.sib_reason = SIB_HELPER_PRE; |
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sib.helper_name = cmd; |
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drbd_bcast_event(device, &sib); |
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notify_helper(NOTIFY_CALL, device, connection, cmd, 0); |
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ret = call_usermodehelper(drbd_usermode_helper, argv, envp, UMH_WAIT_PROC); |
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if (ret) |
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drbd_warn(device, "helper command: %s %s %s exit code %u (0x%x)\n", |
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drbd_usermode_helper, cmd, mb, |
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(ret >> 8) & 0xff, ret); |
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else |
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drbd_info(device, "helper command: %s %s %s exit code %u (0x%x)\n", |
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drbd_usermode_helper, cmd, mb, |
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(ret >> 8) & 0xff, ret); |
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sib.sib_reason = SIB_HELPER_POST; |
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sib.helper_exit_code = ret; |
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drbd_bcast_event(device, &sib); |
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notify_helper(NOTIFY_RESPONSE, device, connection, cmd, ret); |
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if (current == connection->worker.task) |
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clear_bit(CALLBACK_PENDING, &connection->flags); |
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if (ret < 0) /* Ignore any ERRNOs we got. */ |
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ret = 0; |
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return ret; |
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} |
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enum drbd_peer_state conn_khelper(struct drbd_connection *connection, char *cmd) |
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{ |
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char *envp[] = { "HOME=/", |
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"TERM=linux", |
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"PATH=/sbin:/usr/sbin:/bin:/usr/bin", |
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(char[20]) { }, /* address family */ |
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(char[60]) { }, /* address */ |
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NULL }; |
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char *resource_name = connection->resource->name; |
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char *argv[] = {drbd_usermode_helper, cmd, resource_name, NULL }; |
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int ret; |
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setup_khelper_env(connection, envp); |
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conn_md_sync(connection); |
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drbd_info(connection, "helper command: %s %s %s\n", drbd_usermode_helper, cmd, resource_name); |
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/* TODO: conn_bcast_event() ?? */ |
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notify_helper(NOTIFY_CALL, NULL, connection, cmd, 0); |
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ret = call_usermodehelper(drbd_usermode_helper, argv, envp, UMH_WAIT_PROC); |
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if (ret) |
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drbd_warn(connection, "helper command: %s %s %s exit code %u (0x%x)\n", |
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drbd_usermode_helper, cmd, resource_name, |
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(ret >> 8) & 0xff, ret); |
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else |
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drbd_info(connection, "helper command: %s %s %s exit code %u (0x%x)\n", |
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drbd_usermode_helper, cmd, resource_name, |
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(ret >> 8) & 0xff, ret); |
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/* TODO: conn_bcast_event() ?? */ |
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notify_helper(NOTIFY_RESPONSE, NULL, connection, cmd, ret); |
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|
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if (ret < 0) /* Ignore any ERRNOs we got. */ |
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ret = 0; |
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return ret; |
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} |
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static enum drbd_fencing_p highest_fencing_policy(struct drbd_connection *connection) |
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{ |
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enum drbd_fencing_p fp = FP_NOT_AVAIL; |
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struct drbd_peer_device *peer_device; |
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int vnr; |
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|
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rcu_read_lock(); |
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idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
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struct drbd_device *device = peer_device->device; |
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if (get_ldev_if_state(device, D_CONSISTENT)) { |
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struct disk_conf *disk_conf = |
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rcu_dereference(peer_device->device->ldev->disk_conf); |
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fp = max_t(enum drbd_fencing_p, fp, disk_conf->fencing); |
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put_ldev(device); |
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} |
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} |
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rcu_read_unlock(); |
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|
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return fp; |
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} |
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static bool resource_is_supended(struct drbd_resource *resource) |
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{ |
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return resource->susp || resource->susp_fen || resource->susp_nod; |
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} |
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bool conn_try_outdate_peer(struct drbd_connection *connection) |
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{ |
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struct drbd_resource * const resource = connection->resource; |
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unsigned int connect_cnt; |
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union drbd_state mask = { }; |
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union drbd_state val = { }; |
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enum drbd_fencing_p fp; |
|
char *ex_to_string; |
|
int r; |
|
|
|
spin_lock_irq(&resource->req_lock); |
|
if (connection->cstate >= C_WF_REPORT_PARAMS) { |
|
drbd_err(connection, "Expected cstate < C_WF_REPORT_PARAMS\n"); |
|
spin_unlock_irq(&resource->req_lock); |
|
return false; |
|
} |
|
|
|
connect_cnt = connection->connect_cnt; |
|
spin_unlock_irq(&resource->req_lock); |
|
|
|
fp = highest_fencing_policy(connection); |
|
switch (fp) { |
|
case FP_NOT_AVAIL: |
|
drbd_warn(connection, "Not fencing peer, I'm not even Consistent myself.\n"); |
|
spin_lock_irq(&resource->req_lock); |
|
if (connection->cstate < C_WF_REPORT_PARAMS) { |
|
_conn_request_state(connection, |
|
(union drbd_state) { { .susp_fen = 1 } }, |
|
(union drbd_state) { { .susp_fen = 0 } }, |
|
CS_VERBOSE | CS_HARD | CS_DC_SUSP); |
|
/* We are no longer suspended due to the fencing policy. |
|
* We may still be suspended due to the on-no-data-accessible policy. |
|
* If that was OND_IO_ERROR, fail pending requests. */ |
|
if (!resource_is_supended(resource)) |
|
_tl_restart(connection, CONNECTION_LOST_WHILE_PENDING); |
|
} |
|
/* Else: in case we raced with a connection handshake, |
|
* let the handshake figure out if we maybe can RESEND, |
|
* and do not resume/fail pending requests here. |
|
* Worst case is we stay suspended for now, which may be |
|
* resolved by either re-establishing the replication link, or |
|
* the next link failure, or eventually the administrator. */ |
|
spin_unlock_irq(&resource->req_lock); |
|
return false; |
|
|
|
case FP_DONT_CARE: |
|
return true; |
|
default: ; |
|
} |
|
|
|
r = conn_khelper(connection, "fence-peer"); |
|
|
|
switch ((r>>8) & 0xff) { |
|
case P_INCONSISTENT: /* peer is inconsistent */ |
|
ex_to_string = "peer is inconsistent or worse"; |
|
mask.pdsk = D_MASK; |
|
val.pdsk = D_INCONSISTENT; |
|
break; |
|
case P_OUTDATED: /* peer got outdated, or was already outdated */ |
|
ex_to_string = "peer was fenced"; |
|
mask.pdsk = D_MASK; |
|
val.pdsk = D_OUTDATED; |
|
break; |
|
case P_DOWN: /* peer was down */ |
|
if (conn_highest_disk(connection) == D_UP_TO_DATE) { |
|
/* we will(have) create(d) a new UUID anyways... */ |
|
ex_to_string = "peer is unreachable, assumed to be dead"; |
|
mask.pdsk = D_MASK; |
|
val.pdsk = D_OUTDATED; |
|
} else { |
|
ex_to_string = "peer unreachable, doing nothing since disk != UpToDate"; |
|
} |
|
break; |
|
case P_PRIMARY: /* Peer is primary, voluntarily outdate myself. |
|
* This is useful when an unconnected R_SECONDARY is asked to |
|
* become R_PRIMARY, but finds the other peer being active. */ |
|
ex_to_string = "peer is active"; |
|
drbd_warn(connection, "Peer is primary, outdating myself.\n"); |
|
mask.disk = D_MASK; |
|
val.disk = D_OUTDATED; |
|
break; |
|
case P_FENCING: |
|
/* THINK: do we need to handle this |
|
* like case 4, or more like case 5? */ |
|
if (fp != FP_STONITH) |
|
drbd_err(connection, "fence-peer() = 7 && fencing != Stonith !!!\n"); |
|
ex_to_string = "peer was stonithed"; |
|
mask.pdsk = D_MASK; |
|
val.pdsk = D_OUTDATED; |
|
break; |
|
default: |
|
/* The script is broken ... */ |
|
drbd_err(connection, "fence-peer helper broken, returned %d\n", (r>>8)&0xff); |
|
return false; /* Eventually leave IO frozen */ |
|
} |
|
|
|
drbd_info(connection, "fence-peer helper returned %d (%s)\n", |
|
(r>>8) & 0xff, ex_to_string); |
|
|
|
/* Not using |
|
conn_request_state(connection, mask, val, CS_VERBOSE); |
|
here, because we might were able to re-establish the connection in the |
|
meantime. */ |
|
spin_lock_irq(&resource->req_lock); |
|
if (connection->cstate < C_WF_REPORT_PARAMS && !test_bit(STATE_SENT, &connection->flags)) { |
|
if (connection->connect_cnt != connect_cnt) |
|
/* In case the connection was established and droped |
|
while the fence-peer handler was running, ignore it */ |
|
drbd_info(connection, "Ignoring fence-peer exit code\n"); |
|
else |
|
_conn_request_state(connection, mask, val, CS_VERBOSE); |
|
} |
|
spin_unlock_irq(&resource->req_lock); |
|
|
|
return conn_highest_pdsk(connection) <= D_OUTDATED; |
|
} |
|
|
|
static int _try_outdate_peer_async(void *data) |
|
{ |
|
struct drbd_connection *connection = (struct drbd_connection *)data; |
|
|
|
conn_try_outdate_peer(connection); |
|
|
|
kref_put(&connection->kref, drbd_destroy_connection); |
|
return 0; |
|
} |
|
|
|
void conn_try_outdate_peer_async(struct drbd_connection *connection) |
|
{ |
|
struct task_struct *opa; |
|
|
|
kref_get(&connection->kref); |
|
/* We may have just sent a signal to 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. */ |
|
if (try < max_tries) { |
|
int timeo; |
|
try = max_tries - 1; |
|
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); |
|
} |
|
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 = (enum drbd_ret_code)drbd_set_role(adm_ctx.device, |
|
R_PRIMARY, parms.assume_uptodate); |
|
else |
|
retcode = (enum drbd_ret_code)drbd_set_role(adm_ctx.device, |
|
R_SECONDARY, 0); |
|
|
|
mutex_unlock(&adm_ctx.resource->adm_mutex); |
|
genl_lock(); |
|
out: |
|
drbd_adm_finish(&adm_ctx, info, retcode); |
|
return 0; |
|
} |
|
|
|
/* Initializes the md.*_offset members, so we are able to find |
|
* the on disk meta data. |
|
* |
|
* We currently have two possible layouts: |
|
* external: |
|
* |----------- md_size_sect ------------------| |
|
* [ 4k superblock ][ activity log ][ Bitmap ] |
|
* | al_offset == 8 | |
|
* | bm_offset = al_offset + X | |
|
* ==> bitmap sectors = md_size_sect - bm_offset |
|
* |
|
* internal: |
|
* |----------- md_size_sect ------------------| |
|
* [data.....][ Bitmap ][ activity log ][ 4k superblock ] |
|
* | al_offset < 0 | |
|
* | bm_offset = al_offset - Y | |
|
* ==> bitmap sectors = Y = al_offset - bm_offset |
|
* |
|
* Activity log size used to be fixed 32kB, |
|
* but is about to become configurable. |
|
*/ |
|
static void drbd_md_set_sector_offsets(struct drbd_device *device, |
|
struct drbd_backing_dev *bdev) |
|
{ |
|
sector_t md_size_sect = 0; |
|
unsigned int al_size_sect = bdev->md.al_size_4k * 8; |
|
|
|
bdev->md.md_offset = drbd_md_ss(bdev); |
|
|
|
switch (bdev->md.meta_dev_idx) { |
|
default: |
|
/* v07 style fixed size indexed meta data */ |
|
bdev->md.md_size_sect = MD_128MB_SECT; |
|
bdev->md.al_offset = MD_4kB_SECT; |
|
bdev->md.bm_offset = MD_4kB_SECT + al_size_sect; |
|
break; |
|
case DRBD_MD_INDEX_FLEX_EXT: |
|
/* just occupy the full device; unit: sectors */ |
|
bdev->md.md_size_sect = drbd_get_capacity(bdev->md_bdev); |
|
bdev->md.al_offset = MD_4kB_SECT; |
|
bdev->md.bm_offset = MD_4kB_SECT + al_size_sect; |
|
break; |
|
case DRBD_MD_INDEX_INTERNAL: |
|
case DRBD_MD_INDEX_FLEX_INT: |
|
/* al size is still fixed */ |
|
bdev->md.al_offset = -al_size_sect; |
|
/* we need (slightly less than) ~ this much bitmap sectors: */ |
|
md_size_sect = drbd_get_capacity(bdev->backing_bdev); |
|
md_size_sect = ALIGN(md_size_sect, BM_SECT_PER_EXT); |
|
md_size_sect = BM_SECT_TO_EXT(md_size_sect); |
|
md_size_sect = ALIGN(md_size_sect, 8); |
|
|
|
/* plus the "drbd meta data super block", |
|
* and the activity log; */ |
|
md_size_sect += MD_4kB_SECT + al_size_sect; |
|
|
|
bdev->md.md_size_sect = md_size_sect; |
|
/* bitmap offset is adjusted by 'super' block size */ |
|
bdev->md.bm_offset = -md_size_sect + MD_4kB_SECT; |
|
break; |
|
} |
|
} |
|
|
|
/* input size is expected to be in KB */ |
|
char *ppsize(char *buf, unsigned long long size) |
|
{ |
|
/* Needs 9 bytes at max including trailing NUL: |
|
* -1ULL ==> "16384 EB" */ |
|
static char units[] = { 'K', 'M', 'G', 'T', 'P', 'E' }; |
|
int base = 0; |
|
while (size >= 10000 && base < sizeof(units)-1) { |
|
/* shift + round */ |
|
size = (size >> 10) + !!(size & (1<<9)); |
|
base++; |
|
} |
|
sprintf(buf, "%u %cB", (unsigned)size, units[base]); |
|
|
|
return buf; |
|
} |
|
|
|
/* there is still a theoretical deadlock when called from receiver |
|
* on an D_INCONSISTENT R_PRIMARY: |
|
* remote READ does inc_ap_bio, receiver would need to receive answer |
|
* packet from remote to dec_ap_bio again. |
|
* receiver receive_sizes(), comes here, |
|
* waits for ap_bio_cnt == 0. -> deadlock. |
|
* but this cannot happen, actually, because: |
|
* R_PRIMARY D_INCONSISTENT, and peer's disk is unreachable |
|
* (not connected, or bad/no disk on peer): |
|
* see drbd_fail_request_early, ap_bio_cnt is zero. |
|
* R_PRIMARY D_INCONSISTENT, and C_SYNC_TARGET: |
|
* peer may not initiate a resize. |
|
*/ |
|
/* Note these are not to be confused with |
|
* drbd_adm_suspend_io/drbd_adm_resume_io, |
|
* which are (sub) state changes triggered by admin (drbdsetup), |
|
* and can be long lived. |
|
* This changes an device->flag, is triggered by drbd internals, |
|
* and should be short-lived. */ |
|
/* It needs to be a counter, since multiple threads might |
|
independently suspend and resume IO. */ |
|
void drbd_suspend_io(struct drbd_device *device) |
|
{ |
|
atomic_inc(&device->suspend_cnt); |
|
if (drbd_suspended(device)) |
|
return; |
|
wait_event(device->misc_wait, !atomic_read(&device->ap_bio_cnt)); |
|
} |
|
|
|
void drbd_resume_io(struct drbd_device *device) |
|
{ |
|
if (atomic_dec_and_test(&device->suspend_cnt)) |
|
wake_up(&device->misc_wait); |
|
} |
|
|
|
/* |
|
* drbd_determine_dev_size() - Sets the right device size obeying all constraints |
|
* @device: DRBD device. |
|
* |
|
* Returns 0 on success, negative return values indicate errors. |
|
* You should call drbd_md_sync() after calling this function. |
|
*/ |
|
enum determine_dev_size |
|
drbd_determine_dev_size(struct drbd_device *device, enum dds_flags flags, struct resize_parms *rs) __must_hold(local) |
|
{ |
|
struct md_offsets_and_sizes { |
|
u64 last_agreed_sect; |
|
u64 md_offset; |
|
s32 al_offset; |
|
s32 bm_offset; |
|
u32 md_size_sect; |
|
|
|
u32 al_stripes; |
|
u32 al_stripe_size_4k; |
|
} prev; |
|
sector_t u_size, size; |
|
struct drbd_md *md = &device->ldev->md; |
|
void *buffer; |
|
|
|
int md_moved, la_size_changed; |
|
enum determine_dev_size rv = DS_UNCHANGED; |
|
|
|
/* We may change the on-disk offsets of our meta data below. Lock out |
|
* anything that may cause meta data IO, to avoid acting on incomplete |
|
* layout changes or scribbling over meta data that is in the process |
|
* of being moved. |
|
* |
|
* Move is not exactly correct, btw, currently we have all our meta |
|
* data in core memory, to "move" it we just write it all out, there |
|
* are no reads. */ |
|
drbd_suspend_io(device); |
|
buffer = drbd_md_get_buffer(device, __func__); /* Lock meta-data IO */ |
|
if (!buffer) { |
|
drbd_resume_io(device); |
|
return DS_ERROR; |
|
} |
|
|
|
/* remember current offset and sizes */ |
|
prev.last_agreed_sect = md->la_size_sect; |
|
prev.md_offset = md->md_offset; |
|
prev.al_offset = md->al_offset; |
|
prev.bm_offset = md->bm_offset; |
|
prev.md_size_sect = md->md_size_sect; |
|
prev.al_stripes = md->al_stripes; |
|
prev.al_stripe_size_4k = md->al_stripe_size_4k; |
|
|
|
if (rs) { |
|
/* rs is non NULL if we should change the AL layout only */ |
|
md->al_stripes = rs->al_stripes; |
|
md->al_stripe_size_4k = rs->al_stripe_size / 4; |
|
md->al_size_4k = (u64)rs->al_stripes * rs->al_stripe_size / 4; |
|
} |
|
|
|
drbd_md_set_sector_offsets(device, device->ldev); |
|
|
|
rcu_read_lock(); |
|
u_size = rcu_dereference(device->ldev->disk_conf)->disk_size; |
|
rcu_read_unlock(); |
|
size = drbd_new_dev_size(device, device->ldev, u_size, flags & DDSF_FORCED); |
|
|
|
if (size < prev.last_agreed_sect) { |
|
if (rs && u_size == 0) { |
|
/* Remove "rs &&" later. This check should always be active, but |
|
right now the receiver expects the permissive behavior */ |
|
drbd_warn(device, "Implicit shrink not allowed. " |
|
"Use --size=%llus for explicit shrink.\n", |
|
(unsigned long long)size); |
|
rv = DS_ERROR_SHRINK; |
|
} |
|
if (u_size > size) |
|
rv = DS_ERROR_SPACE_MD; |
|
if (rv != DS_UNCHANGED) |
|
goto err_out; |
|
} |
|
|
|
if (get_capacity(device->vdisk) != size || |
|
drbd_bm_capacity(device) != size) { |
|
int err; |
|
err = drbd_bm_resize(device, size, !(flags & DDSF_NO_RESYNC)); |
|
if (unlikely(err)) { |
|
/* currently there is only one error: ENOMEM! */ |
|
size = drbd_bm_capacity(device); |
|
if (size == 0) { |
|
drbd_err(device, "OUT OF MEMORY! " |
|
"Could not allocate bitmap!\n"); |
|
} else { |
|
drbd_err(device, "BM resizing failed. " |
|
"Leaving size unchanged\n"); |
|
} |
|
rv = DS_ERROR; |
|
} |
|
/* racy, see comments above. */ |
|
drbd_set_my_capacity(device, size); |
|
md->la_size_sect = size; |
|
} |
|
if (rv <= DS_ERROR) |
|
goto err_out; |
|
|
|
la_size_changed = (prev.last_agreed_sect != md->la_size_sect); |
|
|
|
md_moved = prev.md_offset != md->md_offset |
|
|| prev.md_size_sect != md->md_size_sect; |
|
|
|
if (la_size_changed || md_moved || rs) { |
|
u32 prev_flags; |
|
|
|
/* We do some synchronous IO below, which may take some time. |
|
* Clear the timer, to avoid scary "timer expired!" messages, |
|
* "Superblock" is written out at least twice below, anyways. */ |
|
del_timer(&device->md_sync_timer); |
|
|
|
/* We won't change the "al-extents" setting, we just may need |
|
* to move the on-disk location of the activity log ringbuffer. |
|
* Lock for transaction is good enough, it may well be "dirty" |
|
* or even "starving". */ |
|
wait_event(device->al_wait, lc_try_lock_for_transaction(device->act_log)); |
|
|
|
/* mark current on-disk bitmap and activity log as unreliable */ |
|
prev_flags = md->flags; |
|
md->flags |= MDF_FULL_SYNC | MDF_AL_DISABLED; |
|
drbd_md_write(device, buffer); |
|
|
|
drbd_al_initialize(device, buffer); |
|
|
|
drbd_info(device, "Writing the whole bitmap, %s\n", |
|
la_size_changed && md_moved ? "size changed and md moved" : |
|
la_size_changed ? "size changed" : "md moved"); |
|
/* next line implicitly does drbd_suspend_io()+drbd_resume_io() */ |
|
drbd_bitmap_io(device, md_moved ? &drbd_bm_write_all : &drbd_bm_write, |
|
"size changed", BM_LOCKED_MASK); |
|
|
|
/* on-disk bitmap and activity log is authoritative again |
|
* (unless there was an IO error meanwhile...) */ |
|
md->flags = prev_flags; |
|
drbd_md_write(device, buffer); |
|
|
|
if (rs) |
|
drbd_info(device, "Changed AL layout to al-stripes = %d, al-stripe-size-kB = %d\n", |
|
md->al_stripes, md->al_stripe_size_4k * 4); |
|
} |
|
|
|
if (size > prev.last_agreed_sect) |
|
rv = prev.last_agreed_sect ? DS_GREW : DS_GREW_FROM_ZERO; |
|
if (size < prev.last_agreed_sect) |
|
rv = DS_SHRUNK; |
|
|
|
if (0) { |
|
err_out: |
|
/* restore previous offset and sizes */ |
|
md->la_size_sect = prev.last_agreed_sect; |
|
md->md_offset = prev.md_offset; |
|
md->al_offset = prev.al_offset; |
|
md->bm_offset = prev.bm_offset; |
|
md->md_size_sect = prev.md_size_sect; |
|
md->al_stripes = prev.al_stripes; |
|
md->al_stripe_size_4k = prev.al_stripe_size_4k; |
|
md->al_size_4k = (u64)prev.al_stripes * prev.al_stripe_size_4k; |
|
} |
|
lc_unlock(device->act_log); |
|
wake_up(&device->al_wait); |
|
drbd_md_put_buffer(device); |
|
drbd_resume_io(device); |
|
|
|
return rv; |
|
} |
|
|
|
sector_t |
|
drbd_new_dev_size(struct drbd_device *device, struct drbd_backing_dev *bdev, |
|
sector_t u_size, int assume_peer_has_space) |
|
{ |
|
sector_t p_size = device->p_size; /* partner's disk size. */ |
|
sector_t la_size_sect = bdev->md.la_size_sect; /* last agreed size. */ |
|
sector_t m_size; /* my size */ |
|
sector_t size = 0; |
|
|
|
m_size = drbd_get_max_capacity(bdev); |
|
|
|
if (device->state.conn < C_CONNECTED && assume_peer_has_space) { |
|
drbd_warn(device, "Resize while not connected was forced by the user!\n"); |
|
p_size = m_size; |
|
} |
|
|
|
if (p_size && m_size) { |
|
size = min_t(sector_t, p_size, m_size); |
|
} else { |
|
if (la_size_sect) { |
|
size = la_size_sect; |
|
if (m_size && m_size < size) |
|
size = m_size; |
|
if (p_size && p_size < size) |
|
size = p_size; |
|
} else { |
|
if (m_size) |
|
size = m_size; |
|
if (p_size) |
|
size = p_size; |
|
} |
|
} |
|
|
|
if (size == 0) |
|
drbd_err(device, "Both nodes diskless!\n"); |
|
|
|
if (u_size) { |
|
if (u_size > size) |
|
drbd_err(device, "Requested disk size is too big (%lu > %lu)\n", |
|
(unsigned long)u_size>>1, (unsigned long)size>>1); |
|
else |
|
size = u_size; |
|
} |
|
|
|
return size; |
|
} |
|
|
|
/* |
|
* drbd_check_al_size() - Ensures that the AL is of the right size |
|
* @device: DRBD device. |
|
* |
|
* Returns -EBUSY if current al lru is still used, -ENOMEM when allocation |
|
* failed, and 0 on success. You should call drbd_md_sync() after you called |
|
* this function. |
|
*/ |
|
static int drbd_check_al_size(struct drbd_device *device, struct disk_conf *dc) |
|
{ |
|
struct lru_cache *n, *t; |
|
struct lc_element *e; |
|
unsigned int in_use; |
|
int i; |
|
|
|
if (device->act_log && |
|
device->act_log->nr_elements == dc->al_extents) |
|
return 0; |
|
|
|
in_use = 0; |
|
t = device->act_log; |
|
n = lc_create("act_log", drbd_al_ext_cache, AL_UPDATES_PER_TRANSACTION, |
|
dc->al_extents, sizeof(struct lc_element), 0); |
|
|
|
if (n == NULL) { |
|
drbd_err(device, "Cannot allocate act_log lru!\n"); |
|
return -ENOMEM; |
|
} |
|
spin_lock_irq(&device->al_lock); |
|
if (t) { |
|
for (i = 0; i < t->nr_elements; i++) { |
|
e = lc_element_by_index(t, i); |
|
if (e->refcnt) |
|
drbd_err(device, "refcnt(%d)==%d\n", |
|
e->lc_number, e->refcnt); |
|
in_use += e->refcnt; |
|
} |
|
} |
|
if (!in_use) |
|
device->act_log = n; |
|
spin_unlock_irq(&device->al_lock); |
|
if (in_use) { |
|
drbd_err(device, "Activity log still in use!\n"); |
|
lc_destroy(n); |
|
return -EBUSY; |
|
} else { |
|
lc_destroy(t); |
|
} |
|
drbd_md_mark_dirty(device); /* we changed device->act_log->nr_elemens */ |
|
return 0; |
|
} |
|
|
|
static void blk_queue_discard_granularity(struct request_queue *q, unsigned int granularity) |
|
{ |
|
q->limits.discard_granularity = granularity; |
|
} |
|
|
|
static unsigned int drbd_max_discard_sectors(struct drbd_connection *connection) |
|
{ |
|
/* when we introduced REQ_WRITE_SAME support, we also bumped |
|
* our maximum supported batch bio size used for discards. */ |
|
if (connection->agreed_features & DRBD_FF_WSAME) |
|
return DRBD_MAX_BBIO_SECTORS; |
|
/* before, with DRBD <= 8.4.6, we only allowed up to one AL_EXTENT_SIZE. */ |
|
return AL_EXTENT_SIZE >> 9; |
|
} |
|
|
|
static void decide_on_discard_support(struct drbd_device *device, |
|
struct request_queue *q, |
|
struct request_queue *b, |
|
bool discard_zeroes_if_aligned) |
|
{ |
|
/* q = drbd device queue (device->rq_queue) |
|
* b = backing device queue (device->ldev->backing_bdev->bd_disk->queue), |
|
* or NULL if diskless |
|
*/ |
|
struct drbd_connection *connection = first_peer_device(device)->connection; |
|
bool can_do = b ? blk_queue_discard(b) : true; |
|
|
|
if (can_do && connection->cstate >= C_CONNECTED && !(connection->agreed_features & DRBD_FF_TRIM)) { |
|
can_do = false; |
|
drbd_info(connection, "peer DRBD too old, does not support TRIM: disabling discards\n"); |
|
} |
|
if (can_do) { |
|
/* We don't care for the granularity, really. |
|
* Stacking limits below should fix it for the local |
|
* device. Whether or not it is a suitable granularity |
|
* on the remote device is not our problem, really. If |
|
* you care, you need to use devices with similar |
|
* topology on all peers. */ |
|
blk_queue_discard_granularity(q, 512); |
|
q->limits.max_discard_sectors = drbd_max_discard_sectors(connection); |
|
blk_queue_flag_set(QUEUE_FLAG_DISCARD, q); |
|
q->limits.max_write_zeroes_sectors = drbd_max_discard_sectors(connection); |
|
} else { |
|
blk_queue_flag_clear(QUEUE_FLAG_DISCARD, q); |
|
blk_queue_discard_granularity(q, 0); |
|
q->limits.max_discard_sectors = 0; |
|
q->limits.max_write_zeroes_sectors = 0; |
|
} |
|
} |
|
|
|
static void fixup_discard_if_not_supported(struct request_queue *q) |
|
{ |
|
/* To avoid confusion, if this queue does not support discard, clear |
|
* max_discard_sectors, which is what lsblk -D reports to the user. |
|
* Older kernels got this wrong in "stack limits". |
|
* */ |
|
if (!blk_queue_discard(q)) { |
|
blk_queue_max_discard_sectors(q, 0); |
|
blk_queue_discard_granularity(q, 0); |
|
} |
|
} |
|
|
|
static void fixup_write_zeroes(struct drbd_device *device, struct request_queue *q) |
|
{ |
|
/* Fixup max_write_zeroes_sectors after blk_stack_limits(): |
|
* if we can handle "zeroes" efficiently on the protocol, |
|
* we want to do that, even if our backend does not announce |
|
* max_write_zeroes_sectors itself. */ |
|
struct drbd_connection *connection = first_peer_device(device)->connection; |
|
/* If the peer announces WZEROES support, use it. Otherwise, rather |
|
* send explicit zeroes than rely on some discard-zeroes-data magic. */ |
|
if (connection->agreed_features & DRBD_FF_WZEROES) |
|
q->limits.max_write_zeroes_sectors = DRBD_MAX_BBIO_SECTORS; |
|
else |
|
q->limits.max_write_zeroes_sectors = 0; |
|
} |
|
|
|
static void decide_on_write_same_support(struct drbd_device *device, |
|
struct request_queue *q, |
|
struct request_queue *b, struct o_qlim *o, |
|
bool disable_write_same) |
|
{ |
|
struct drbd_peer_device *peer_device = first_peer_device(device); |
|
struct drbd_connection *connection = peer_device->connection; |
|
bool can_do = b ? b->limits.max_write_same_sectors : true; |
|
|
|
if (can_do && disable_write_same) { |
|
can_do = false; |
|
drbd_info(peer_device, "WRITE_SAME disabled by config\n"); |
|
} |
|
|
|
if (can_do && connection->cstate >= C_CONNECTED && !(connection->agreed_features & DRBD_FF_WSAME)) { |
|
can_do = false; |
|
drbd_info(peer_device, "peer does not support WRITE_SAME\n"); |
|
} |
|
|
|
if (o) { |
|
/* logical block size; queue_logical_block_size(NULL) is 512 */ |
|
unsigned int peer_lbs = be32_to_cpu(o->logical_block_size); |
|
unsigned int me_lbs_b = queue_logical_block_size(b); |
|
unsigned int me_lbs = queue_logical_block_size(q); |
|
|
|
if (me_lbs_b != me_lbs) { |
|
drbd_warn(device, |
|
"logical block size of local backend does not match (drbd:%u, backend:%u); was this a late attach?\n", |
|
me_lbs, me_lbs_b); |
|
/* rather disable write same than trigger some BUG_ON later in the scsi layer. */ |
|
can_do = false; |
|
} |
|
if (me_lbs_b != peer_lbs) { |
|
drbd_warn(peer_device, "logical block sizes do not match (me:%u, peer:%u); this may cause problems.\n", |
|
me_lbs, peer_lbs); |
|
if (can_do) { |
|
drbd_dbg(peer_device, "logical block size mismatch: WRITE_SAME disabled.\n"); |
|
can_do = false; |
|
} |
|
me_lbs = max(me_lbs, me_lbs_b); |
|
/* We cannot change the logical block size of an in-use queue. |
|
* We can only hope that access happens to be properly aligned. |
|
* If not, the peer will likely produce an IO error, and detach. */ |
|
if (peer_lbs > me_lbs) { |
|
if (device->state.role != R_PRIMARY) { |
|
blk_queue_logical_block_size(q, peer_lbs); |
|
drbd_warn(peer_device, "logical block size set to %u\n", peer_lbs); |
|
} else { |
|
drbd_warn(peer_device, |
|
"current Primary must NOT adjust logical block size (%u -> %u); hope for the best.\n", |
|
me_lbs, peer_lbs); |
|
} |
|
} |
|
} |
|
if (can_do && !o->write_same_capable) { |
|
/* If we introduce an open-coded write-same loop on the receiving side, |
|
* the peer would present itself as "capable". */ |
|
drbd_dbg(peer_device, "WRITE_SAME disabled (peer device not capable)\n"); |
|
can_do = false; |
|
} |
|
} |
|
|
|
blk_queue_max_write_same_sectors(q, can_do ? DRBD_MAX_BBIO_SECTORS : 0); |
|
} |
|
|
|
static void drbd_setup_queue_param(struct drbd_device *device, struct drbd_backing_dev *bdev, |
|
unsigned int max_bio_size, struct o_qlim *o) |
|
{ |
|
struct request_queue * const q = device->rq_queue; |
|
unsigned int max_hw_sectors = max_bio_size >> 9; |
|
unsigned int max_segments = 0; |
|
struct request_queue *b = NULL; |
|
struct disk_conf *dc; |
|
bool discard_zeroes_if_aligned = true; |
|
bool disable_write_same = false; |
|
|
|
if (bdev) { |
|
b = bdev->backing_bdev->bd_disk->queue; |
|
|
|
max_hw_sectors = min(queue_max_hw_sectors(b), max_bio_size >> 9); |
|
rcu_read_lock(); |
|
dc = rcu_dereference(device->ldev->disk_conf); |
|
max_segments = dc->max_bio_bvecs; |
|
discard_zeroes_if_aligned = dc->discard_zeroes_if_aligned; |
|
disable_write_same = dc->disable_write_same; |
|
rcu_read_unlock(); |
|
|
|
blk_set_stacking_limits(&q->limits); |
|
} |
|
|
|
blk_queue_max_hw_sectors(q, max_hw_sectors); |
|
/* This is the workaround for "bio would need to, but cannot, be split" */ |
|
blk_queue_max_segments(q, max_segments ? max_segments : BLK_MAX_SEGMENTS); |
|
blk_queue_segment_boundary(q, PAGE_SIZE-1); |
|
decide_on_discard_support(device, q, b, discard_zeroes_if_aligned); |
|
decide_on_write_same_support(device, q, b, o, disable_write_same); |
|
|
|
if (b) { |
|
blk_stack_limits(&q->limits, &b->limits, 0); |
|
disk_update_readahead(device->vdisk); |
|
} |
|
fixup_discard_if_not_supported(q); |
|
fixup_write_zeroes(device, q); |
|
} |
|
|
|
void drbd_reconsider_queue_parameters(struct drbd_device *device, struct drbd_backing_dev *bdev, struct o_qlim *o) |
|
{ |
|
unsigned int now, new, local, peer; |
|
|
|
now = queue_max_hw_sectors(device->rq_queue) << 9; |
|
local = device->local_max_bio_size; /* Eventually last known value, from volatile memory */ |
|
peer = device->peer_max_bio_size; /* Eventually last known value, from meta data */ |
|
|
|
if (bdev) { |
|
local = queue_max_hw_sectors(bdev->backing_bdev->bd_disk->queue) << 9; |
|
device->local_max_bio_size = local; |
|
} |
|
local = min(local, DRBD_MAX_BIO_SIZE); |
|
|
|
/* We may ignore peer limits if the peer is modern enough. |
|
Because new from 8.3.8 onwards the peer can use multiple |
|
BIOs for a single peer_request */ |
|
if (device->state.conn >= C_WF_REPORT_PARAMS) { |
|
if (first_peer_device(device)->connection->agreed_pro_version < 94) |
|
peer = min(device->peer_max_bio_size, DRBD_MAX_SIZE_H80_PACKET); |
|
/* Correct old drbd (up to 8.3.7) if it believes it can do more than 32KiB */ |
|
else if (first_peer_device(device)->connection->agreed_pro_version == 94) |
|
peer = DRBD_MAX_SIZE_H80_PACKET; |
|
else if (first_peer_device(device)->connection->agreed_pro_version < 100) |
|
peer = DRBD_MAX_BIO_SIZE_P95; /* drbd 8.3.8 onwards, before 8.4.0 */ |
|
else |
|
peer = DRBD_MAX_BIO_SIZE; |
|
|
|
/* We may later detach and re-attach on a disconnected Primary. |
|
* Avoid this setting to jump back in that case. |
|
* We want to store what we know the peer DRBD can handle, |
|
* not what the peer IO backend can handle. */ |
|
if (peer > device->peer_max_bio_size) |
|
device->peer_max_bio_size = peer; |
|
} |
|
new = min(local, peer); |
|
|
|
if (device->state.role == R_PRIMARY && new < now) |
|
drbd_err(device, "ASSERT FAILED new < now; (%u < %u)\n", new, now); |
|
|
|
if (new != now) |
|
drbd_info(device, "max BIO size = %u\n", new); |
|
|
|
drbd_setup_queue_param(device, bdev, new, o); |
|
} |
|
|
|
/* Starts the worker thread */ |
|
static void conn_reconfig_start(struct drbd_connection *connection) |
|
{ |
|
drbd_thread_start(&connection->worker); |
|
drbd_flush_workqueue(&connection->sender_work); |
|
} |
|
|
|
/* if still unconfigured, stops worker again. */ |
|
static void conn_reconfig_done(struct drbd_connection *connection) |
|
{ |
|
bool stop_threads; |
|
spin_lock_irq(&connection->resource->req_lock); |
|
stop_threads = conn_all_vols_unconf(connection) && |
|
connection->cstate == C_STANDALONE; |
|
spin_unlock_irq(&connection->resource->req_lock); |
|
if (stop_threads) { |
|
/* ack_receiver thread and ack_sender workqueue are implicitly |
|
* stopped by receiver in conn_disconnect() */ |
|
drbd_thread_stop(&connection->receiver); |
|
drbd_thread_stop(&connection->worker); |
|
} |
|
} |
|
|
|
/* Make sure IO is suspended before calling this function(). */ |
|
static void drbd_suspend_al(struct drbd_device *device) |
|
{ |
|
int s = 0; |
|
|
|
if (!lc_try_lock(device->act_log)) { |
|
drbd_warn(device, "Failed to lock al in drbd_suspend_al()\n"); |
|
return; |
|
} |
|
|
|
drbd_al_shrink(device); |
|
spin_lock_irq(&device->resource->req_lock); |
|
if (device->state.conn < C_CONNECTED) |
|
s = !test_and_set_bit(AL_SUSPENDED, &device->flags); |
|
spin_unlock_irq(&device->resource->req_lock); |
|
lc_unlock(device->act_log); |
|
|
|
if (s) |
|
drbd_info(device, "Suspended AL updates\n"); |
|
} |
|
|
|
|
|
static bool should_set_defaults(struct genl_info *info) |
|
{ |
|
unsigned flags = ((struct drbd_genlmsghdr*)info->userhdr)->flags; |
|
return 0 != (flags & DRBD_GENL_F_SET_DEFAULTS); |
|
} |
|
|
|
static unsigned int drbd_al_extents_max(struct drbd_backing_dev *bdev) |
|
{ |
|
/* This is limited by 16 bit "slot" numbers, |
|
* and by available on-disk context storage. |
|
* |
|
* Also (u16)~0 is special (denotes a "free" extent). |
|
* |
|
* One transaction occupies one 4kB on-disk block, |
|
* we have n such blocks in the on disk ring buffer, |
|
* the "current" transaction may fail (n-1), |
|
* and there is 919 slot numbers context information per transaction. |
|
* |
|
* 72 transaction blocks amounts to more than 2**16 context slots, |
|
* so cap there first. |
|
*/ |
|
const unsigned int max_al_nr = DRBD_AL_EXTENTS_MAX; |
|
const unsigned int sufficient_on_disk = |
|
(max_al_nr + AL_CONTEXT_PER_TRANSACTION -1) |
|
/AL_CONTEXT_PER_TRANSACTION; |
|
|
|
unsigned int al_size_4k = bdev->md.al_size_4k; |
|
|
|
if (al_size_4k > sufficient_on_disk) |
|
return max_al_nr; |
|
|
|
return (al_size_4k - 1) * AL_CONTEXT_PER_TRANSACTION; |
|
} |
|
|
|
static bool write_ordering_changed(struct disk_conf *a, struct disk_conf *b) |
|
{ |
|
return a->disk_barrier != b->disk_barrier || |
|
a->disk_flushes != b->disk_flushes || |
|
a->disk_drain != b->disk_drain; |
|
} |
|
|
|
static void sanitize_disk_conf(struct drbd_device *device, struct disk_conf *disk_conf, |
|
struct drbd_backing_dev *nbc) |
|
{ |
|
struct request_queue * const q = nbc->backing_bdev->bd_disk->queue; |
|
|
|
if (disk_conf->al_extents < DRBD_AL_EXTENTS_MIN) |
|
disk_conf->al_extents = DRBD_AL_EXTENTS_MIN; |
|
if (disk_conf->al_extents > drbd_al_extents_max(nbc)) |
|
disk_conf->al_extents = drbd_al_extents_max(nbc); |
|
|
|
if (!blk_queue_discard(q)) { |
|
if (disk_conf->rs_discard_granularity) { |
|
disk_conf->rs_discard_granularity = 0; /* disable feature */ |
|
drbd_info(device, "rs_discard_granularity feature disabled\n"); |
|
} |
|
} |
|
|
|
if (disk_conf->rs_discard_granularity) { |
|
int orig_value = disk_conf->rs_discard_granularity; |
|
int remainder; |
|
|
|
if (q->limits.discard_granularity > disk_conf->rs_discard_granularity) |
|
disk_conf->rs_discard_granularity = q->limits.discard_granularity; |
|
|
|
remainder = disk_conf->rs_discard_granularity % q->limits.discard_granularity; |
|
disk_conf->rs_discard_granularity += remainder; |
|
|
|
if (disk_conf->rs_discard_granularity > q->limits.max_discard_sectors << 9) |
|
disk_conf->rs_discard_granularity = q->limits.max_discard_sectors << 9; |
|
|
|
if (disk_conf->rs_discard_granularity != orig_value) |
|
drbd_info(device, "rs_discard_granularity changed to %d\n", |
|
disk_conf->rs_discard_granularity); |
|
} |
|
} |
|
|
|
static int disk_opts_check_al_size(struct drbd_device *device, struct disk_conf *dc) |
|
{ |
|
int err = -EBUSY; |
|
|
|
if (device->act_log && |
|
device->act_log->nr_elements == dc->al_extents) |
|
return 0; |
|
|
|
drbd_suspend_io(device); |
|
/* If IO completion is currently blocked, we would likely wait |
|
* "forever" for the activity log to become unused. So we don't. */ |
|
if (atomic_read(&device->ap_bio_cnt)) |
|
goto out; |
|
|
|
wait_event(device->al_wait, lc_try_lock(device->act_log)); |
|
drbd_al_shrink(device); |
|
err = drbd_check_al_size(device, dc); |
|
lc_unlock(device->act_log); |
|
wake_up(&device->al_wait); |
|
out: |
|
drbd_resume_io(device); |
|
return err; |
|
} |
|
|
|
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; |
|
unsigned int fifo_size; |
|
|
|
retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR); |
|
if (!adm_ctx.reply_skb) |
|
return retcode; |
|
if (retcode != NO_ERROR) |
|
goto finish; |
|
|
|
device = adm_ctx.device; |
|
mutex_lock(&adm_ctx.resource->adm_mutex); |
|
|
|
/* we also need a disk |
|
* to change the options on */ |
|
if (!get_ldev(device)) { |
|
retcode = ERR_NO_DISK; |
|
goto out; |
|
} |
|
|
|
new_disk_conf = kmalloc(sizeof(struct disk_conf), GFP_KERNEL); |
|
if (!new_disk_conf) { |
|
retcode = ERR_NOMEM; |
|
goto fail; |
|
} |
|
|
|
mutex_lock(&device->resource->conf_update); |
|
old_disk_conf = device->ldev->disk_conf; |
|
*new_disk_conf = *old_disk_conf; |
|
if (should_set_defaults(info)) |
|
set_disk_conf_defaults(new_disk_conf); |
|
|
|
err = disk_conf_from_attrs_for_change(new_disk_conf, info); |
|
if (err && err != -ENOMSG) { |
|
retcode = ERR_MANDATORY_TAG; |
|
drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err)); |
|
goto fail_unlock; |
|
} |
|
|
|
if (!expect(new_disk_conf->resync_rate >= 1)) |
|
new_disk_conf->resync_rate = 1; |
|
|
|
sanitize_disk_conf(device, new_disk_conf, device->ldev); |
|
|
|
if (new_disk_conf->c_plan_ahead > DRBD_C_PLAN_AHEAD_MAX) |
|
new_disk_conf->c_plan_ahead = DRBD_C_PLAN_AHEAD_MAX; |
|
|
|
fifo_size = (new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ; |
|
if (fifo_size != device->rs_plan_s->size) { |
|
new_plan = fifo_alloc(fifo_size); |
|
if (!new_plan) { |
|
drbd_err(device, "kmalloc of fifo_buffer failed"); |
|
retcode = ERR_NOMEM; |
|
goto fail_unlock; |
|
} |
|
} |
|
|
|
err = disk_opts_check_al_size(device, new_disk_conf); |
|
if (err) { |
|
/* Could be just "busy". Ignore? |
|
* Introduce dedicated error code? */ |
|
drbd_msg_put_info(adm_ctx.reply_skb, |
|
"Try again without changing current al-extents setting"); |
|
retcode = ERR_NOMEM; |
|
goto fail_unlock; |
|
} |
|
|
|
lock_all_resources(); |
|
retcode = drbd_resync_after_valid(device, new_disk_conf->resync_after); |
|
if (retcode == NO_ERROR) { |
|
rcu_assign_pointer(device->ldev->disk_conf, new_disk_conf); |
|
drbd_resync_after_changed(device); |
|
} |
|
unlock_all_resources(); |
|
|
|
if (retcode != NO_ERROR) |
|
goto fail_unlock; |
|
|
|
if (new_plan) { |
|
old_plan = device->rs_plan_s; |
|
rcu_assign_pointer(device->rs_plan_s, new_plan); |
|
} |
|
|
|
mutex_unlock(&device->resource->conf_update); |
|
|
|
if (new_disk_conf->al_updates) |
|
device->ldev->md.flags &= ~MDF_AL_DISABLED; |
|
else |
|
device->ldev->md.flags |= MDF_AL_DISABLED; |
|
|
|
if (new_disk_conf->md_flushes) |
|
clear_bit(MD_NO_FUA, &device->flags); |
|
else |
|
set_bit(MD_NO_FUA, &device->flags); |
|
|
|
if (write_ordering_changed(old_disk_conf, new_disk_conf)) |
|
drbd_bump_write_ordering(device->resource, NULL, WO_BDEV_FLUSH); |
|
|
|
if (old_disk_conf->discard_zeroes_if_aligned != new_disk_conf->discard_zeroes_if_aligned |
|
|| old_disk_conf->disable_write_same != new_disk_conf->disable_write_same) |
|
drbd_reconsider_queue_parameters(device, device->ldev, NULL); |
|
|
|
drbd_md_sync(device); |
|
|
|
if (device->state.conn >= C_CONNECTED) { |
|
struct drbd_peer_device *peer_device; |
|
|
|
for_each_peer_device(peer_device, device) |
|
drbd_send_sync_param(peer_device); |
|
} |
|
|
|
synchronize_rcu(); |
|
kfree(old_disk_conf); |
|
kfree(old_plan); |
|
mod_timer(&device->request_timer, jiffies + HZ); |
|
goto success; |
|
|
|
fail_unlock: |
|
mutex_unlock(&device->resource->conf_update); |
|
fail: |
|
kfree(new_disk_conf); |
|
kfree(new_plan); |
|
success: |
|
put_ldev(device); |
|
out: |
|
mutex_unlock(&adm_ctx.resource->adm_mutex); |
|
finish: |
|
drbd_adm_finish(&adm_ctx, info, retcode); |
|
return 0; |
|
} |
|
|
|
static struct block_device *open_backing_dev(struct drbd_device *device, |
|
const char *bdev_path, void *claim_ptr, bool do_bd_link) |
|
{ |
|
struct block_device *bdev; |
|
int err = 0; |
|
|
|
bdev = blkdev_get_by_path(bdev_path, |
|
FMODE_READ | FMODE_WRITE | FMODE_EXCL, claim_ptr); |
|
if (IS_ERR(bdev)) { |
|
drbd_err(device, "open(\"%s\") failed with %ld\n", |
|
bdev_path, PTR_ERR(bdev)); |
|
return bdev; |
|
} |
|
|
|
if (!do_bd_link) |
|
return bdev; |
|
|
|
err = bd_link_disk_holder(bdev, device->vdisk); |
|
if (err) { |
|
blkdev_put(bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL); |
|
drbd_err(device, "bd_link_disk_holder(\"%s\", ...) failed with %d\n", |
|
bdev_path, err); |
|
bdev = ERR_PTR(err); |
|
} |
|
return bdev; |
|
} |
|
|
|
static int open_backing_devices(struct drbd_device *device, |
|
struct disk_conf *new_disk_conf, |
|
struct drbd_backing_dev *nbc) |
|
{ |
|
struct block_device *bdev; |
|
|
|
bdev = open_backing_dev(device, new_disk_conf->backing_dev, device, true); |
|
if (IS_ERR(bdev)) |
|
return ERR_OPEN_DISK; |
|
nbc->backing_bdev = bdev; |
|
|
|
/* |
|
* meta_dev_idx >= 0: external fixed size, possibly multiple |
|
* drbd sharing one meta device. TODO in that case, paranoia |
|
* check that [md_bdev, meta_dev_idx] is not yet used by some |
|
* other drbd minor! (if you use drbd.conf + drbdadm, that |
|
* should check it for you already; but if you don't, or |
|
* someone fooled it, we need to double check here) |
|
*/ |
|
bdev = open_backing_dev(device, new_disk_conf->meta_dev, |
|
/* claim ptr: device, if claimed exclusively; shared drbd_m_holder, |
|
* if potentially shared with other drbd minors */ |
|
(new_disk_conf->meta_dev_idx < 0) ? (void*)device : (void*)drbd_m_holder, |
|
/* avoid double bd_claim_by_disk() for the same (source,target) tuple, |
|
* as would happen with internal metadata. */ |
|
(new_disk_conf->meta_dev_idx != DRBD_MD_INDEX_FLEX_INT && |
|
new_disk_conf->meta_dev_idx != DRBD_MD_INDEX_INTERNAL)); |
|
if (IS_ERR(bdev)) |
|
return ERR_OPEN_MD_DISK; |
|
nbc->md_bdev = bdev; |
|
return NO_ERROR; |
|
} |
|
|
|
static void close_backing_dev(struct drbd_device *device, struct block_device *bdev, |
|
bool do_bd_unlink) |
|
{ |
|
if (!bdev) |
|
return; |
|
if (do_bd_unlink) |
|
bd_unlink_disk_holder(bdev, device->vdisk); |
|
blkdev_put(bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL); |
|
} |
|
|
|
void drbd_backing_dev_free(struct drbd_device *device, struct drbd_backing_dev *ldev) |
|
{ |
|
if (ldev == NULL) |
|
return; |
|
|
|
close_backing_dev(device, ldev->md_bdev, ldev->md_bdev != ldev->backing_bdev); |
|
close_backing_dev(device, ldev->backing_bdev, true); |
|
|
|
kfree(ldev->disk_conf); |
|
kfree(ldev); |
|
} |
|
|
|
int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info) |
|
{ |
|
struct drbd_config_context adm_ctx; |
|
struct drbd_device *device; |
|
struct drbd_peer_device *peer_device; |
|
struct drbd_connection *connection; |
|
int err; |
|
enum drbd_ret_code retcode; |
|
enum determine_dev_size dd; |
|
sector_t max_possible_sectors; |
|
sector_t min_md_device_sectors; |
|
struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */ |
|
struct disk_conf *new_disk_conf = NULL; |
|
struct lru_cache *resync_lru = NULL; |
|
struct fifo_buffer *new_plan = NULL; |
|
union drbd_state ns, os; |
|
enum drbd_state_rv rv; |
|
struct net_conf *nc; |
|
|
|
retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_MINOR); |
|
if (!adm_ctx.reply_skb) |
|
return retcode; |
|
if (retcode != NO_ERROR) |
|
goto finish; |
|
|
|
device = adm_ctx.device; |
|
mutex_lock(&adm_ctx.resource->adm_mutex); |
|
peer_device = first_peer_device(device); |
|
connection = peer_device->connection; |
|
conn_reconfig_start(connection); |
|
|
|
/* if you want to reconfigure, please tear down first */ |
|
if (device->state.disk > D_DISKLESS) { |
|
retcode = ERR_DISK_CONFIGURED; |
|
goto fail; |
|
} |
|
/* It may just now have detached because of IO error. Make sure |
|
* drbd_ldev_destroy is done already, we may end up here very fast, |
|
* e.g. if someone calls attach from the on-io-error handler, |
|
* to realize a "hot spare" feature (not that I'd recommend that) */ |
|
wait_event(device->misc_wait, !test_bit(GOING_DISKLESS, &device->flags)); |
|
|
|
/* make sure there is no leftover from previous force-detach attempts */ |
|
clear_bit(FORCE_DETACH, &device->flags); |
|
clear_bit(WAS_IO_ERROR, &device->flags); |
|
clear_bit(WAS_READ_ERROR, &device->flags); |
|
|
|
/* and no leftover from previously aborted resync or verify, either */ |
|
device->rs_total = 0; |
|
device->rs_failed = 0; |
|
atomic_set(&device->rs_pending_cnt, 0); |
|
|
|
/* allocation not in the IO path, drbdsetup context */ |
|
nbc = kzalloc(sizeof(struct drbd_backing_dev), GFP_KERNEL); |
|
if (!nbc) { |
|
retcode = ERR_NOMEM; |
|
goto fail; |
|
} |
|
spin_lock_init(&nbc->md.uuid_lock); |
|
|
|
new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL); |
|
if (!new_disk_conf) { |
|
retcode = ERR_NOMEM; |
|
goto fail; |
|
} |
|
nbc->disk_conf = new_disk_conf; |
|
|
|
set_disk_conf_defaults(new_disk_conf); |
|
err = disk_conf_from_attrs(new_disk_conf, info); |
|
if (err) { |
|
retcode = ERR_MANDATORY_TAG; |
|
drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err)); |
|
goto fail; |
|
} |
|
|
|
if (new_disk_conf->c_plan_ahead > DRBD_C_PLAN_AHEAD_MAX) |
|
new_disk_conf->c_plan_ahead = DRBD_C_PLAN_AHEAD_MAX; |
|
|
|
new_plan = fifo_alloc((new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ); |
|
if (!new_plan) { |
|
retcode = ERR_NOMEM; |
|
goto fail; |
|
} |
|
|
|
if (new_disk_conf->meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) { |
|
retcode = ERR_MD_IDX_INVALID; |
|
goto fail; |
|
} |
|
|
|
rcu_read_lock(); |
|
nc = rcu_dereference(connection->net_conf); |
|
if (nc) { |
|
if (new_disk_conf->fencing == FP_STONITH && nc->wire_protocol == DRBD_PROT_A) { |
|
rcu_read_unlock(); |
|
retcode = ERR_STONITH_AND_PROT_A; |
|
goto fail; |
|
} |
|
} |
|
rcu_read_unlock(); |
|
|
|
retcode = open_backing_devices(device, new_disk_conf, nbc); |
|
if (retcode != NO_ERROR) |
|
goto fail; |
|
|
|
if ((nbc->backing_bdev == nbc->md_bdev) != |
|
(new_disk_conf->meta_dev_idx == DRBD_MD_INDEX_INTERNAL || |
|
new_disk_conf->meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) { |
|
retcode = ERR_MD_IDX_INVALID; |
|
goto fail; |
|
} |
|
|
|
resync_lru = lc_create("resync", drbd_bm_ext_cache, |
|
1, 61, sizeof(struct bm_extent), |
|
offsetof(struct bm_extent, lce)); |
|
if (!resync_lru) { |
|
retcode = ERR_NOMEM; |
|
goto fail; |
|
} |
|
|
|
/* Read our meta data super block early. |
|
* This also sets other on-disk offsets. */ |
|
retcode = drbd_md_read(device, nbc); |
|
if (retcode != NO_ERROR) |
|
goto fail; |
|
|
|
sanitize_disk_conf(device, new_disk_conf, nbc); |
|
|
|
if (drbd_get_max_capacity(nbc) < new_disk_conf->disk_size) { |
|
drbd_err(device, "max capacity %llu smaller than disk size %llu\n", |
|
(unsigned long long) drbd_get_max_capacity(nbc), |
|
(unsigned long long) new_disk_conf->disk_size); |
|
retcode = ERR_DISK_TOO_SMALL; |
|
goto fail; |
|
} |
|
|
|
if (new_disk_conf->meta_dev_idx < 0) { |
|
max_possible_sectors = DRBD_MAX_SECTORS_FLEX; |
|
/* at least one MB, otherwise it does not make sense */ |
|
min_md_device_sectors = (2<<10); |
|
} else { |
|
max_possible_sectors = DRBD_MAX_SECTORS; |
|
min_md_device_sectors = MD_128MB_SECT * (new_disk_conf->meta_dev_idx + 1); |
|
} |
|
|
|
if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) { |
|
retcode = ERR_MD_DISK_TOO_SMALL; |
|
drbd_warn(device, "refusing attach: md-device too small, " |
|
"at least %llu sectors needed for this meta-disk type\n", |
|
(unsigned long long) min_md_device_sectors); |
|
goto fail; |
|
} |
|
|
|
/* Make sure the new disk is big enough |
|
* (we may currently be R_PRIMARY with no local disk...) */ |
|
if (drbd_get_max_capacity(nbc) < get_capacity(device->vdisk)) { |
|
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 = (enum drbd_ret_code)rv; |
|
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.pdsk != D_UP_TO_DATE && device->ed_uuid && |
|
(device->state.role == R_PRIMARY || device->state.peer == R_PRIMARY) && |
|
(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 ! */ |
|
{ |
|
unsigned long long nsz = drbd_new_dev_size(device, nbc, nbc->disk_conf->disk_size, 0); |
|
unsigned long long eff = nbc->md.la_size_sect; |
|
if (drbd_md_test_flag(nbc, MDF_CONSISTENT) && nsz < eff) { |
|
if (nsz == nbc->disk_conf->disk_size) { |
|
drbd_warn(device, "truncating a consistent device during attach (%llu < %llu)\n", nsz, eff); |
|
} else { |
|
drbd_warn(device, "refusing to truncate a consistent device (%llu < %llu)\n", nsz, eff); |
|
drbd_msg_sprintf_info(adm_ctx.reply_skb, |
|
"To-be-attached device has last effective > current size, and is consistent\n" |
|
"(%llu > %llu sectors). Refusing to attach.", eff, nsz); |
|
retcode = ERR_IMPLICIT_SHRINK; |
|
goto force_diskless_dec; |
|
} |
|
} |
|
} |
|
|
|
lock_all_resources(); |
|
retcode = drbd_resync_after_valid(device, new_disk_conf->resync_after); |
|
if (retcode != NO_ERROR) { |
|
unlock_all_resources(); |
|
goto force_diskless_dec; |
|
} |
|
|
|
/* Reset the "barriers don't work" bits here, then force meta data to |
|
* be written, to ensure we determine if barriers are supported. */ |
|
if (new_disk_conf->md_flushes) |
|
clear_bit(MD_NO_FUA, &device->flags); |
|
else |
|
set_bit(MD_NO_FUA, &device->flags); |
|
|
|
/* Point of no return reached. |
|
* Devices and memory are no longer released by error cleanup below. |
|
* now device takes over responsibility, and the state engine should |
|
* clean it up somewhere. */ |
|
D_ASSERT(device, device->ldev == NULL); |
|
device->ldev = nbc; |
|
device->resync = resync_lru; |
|
device->rs_plan_s = new_plan; |
|
nbc = NULL; |
|
resync_lru = NULL; |
|
new_disk_conf = NULL; |
|
new_plan = NULL; |
|
|
|
drbd_resync_after_changed(device); |
|
drbd_bump_write_ordering(device->resource, device->ldev, WO_BDEV_FLUSH); |
|
unlock_all_resources(); |
|
|
|
if (drbd_md_test_flag(device->ldev, MDF_CRASHED_PRIMARY)) |
|
set_bit(CRASHED_PRIMARY, &device->flags); |
|
else |
|
clear_bit(CRASHED_PRIMARY, &device->flags); |
|
|
|
if (drbd_md_test_flag(device->ldev, MDF_PRIMARY_IND) && |
|
!(device->state.role == R_PRIMARY && device->resource->susp_nod)) |
|
set_bit(CRASHED_PRIMARY, &device->flags); |
|
|
|
device->send_cnt = 0; |
|
device->recv_cnt = 0; |
|
device->read_cnt = 0; |
|
device->writ_cnt = 0; |
|
|
|
drbd_reconsider_queue_parameters(device, device->ldev, NULL); |
|
|
|
/* If I am currently not R_PRIMARY, |
|
* but meta data primary indicator is set, |
|
* I just now recover from a hard crash, |
|
* and have been R_PRIMARY before that crash. |
|
* |
|
* Now, if I had no connection before that crash |
|
* (have been degraded R_PRIMARY), chances are that |
|
* I won't find my peer now either. |
|
* |
|
* In that case, and _only_ in that case, |
|
* we use the degr-wfc-timeout instead of the default, |
|
* so we can automatically recover from a crash of a |
|
* degraded but active "cluster" after a certain timeout. |
|
*/ |
|
clear_bit(USE_DEGR_WFC_T, &device->flags); |
|
if (device->state.role != R_PRIMARY && |
|
drbd_md_test_flag(device->ldev, MDF_PRIMARY_IND) && |
|
!drbd_md_test_flag(device->ldev, MDF_CONNECTED_IND)) |
|
set_bit(USE_DEGR_WFC_T, &device->flags); |
|
|
|
dd = drbd_determine_dev_size(device, 0, NULL); |
|
if (dd <= DS_ERROR) { |
|
retcode = ERR_NOMEM_BITMAP; |
|
goto force_diskless_dec; |
|
} else if (dd == DS_GREW) |
|
set_bit(RESYNC_AFTER_NEG, &device->flags); |
|
|
|
if (drbd_md_test_flag(device->ldev, MDF_FULL_SYNC) || |
|
(test_bit(CRASHED_PRIMARY, &device->flags) && |
|
drbd_md_test_flag(device->ldev, MDF_AL_DISABLED))) { |
|
drbd_info(device, "Assuming that all blocks are out of sync " |
|
"(aka FullSync)\n"); |
|
if (drbd_bitmap_io(device, &drbd_bmio_set_n_write, |
|
"set_n_write from attaching", BM_LOCKED_MASK)) { |
|
retcode = ERR_IO_MD_DISK; |
|
goto force_diskless_dec; |
|
} |
|
} else { |
|
if (drbd_bitmap_io(device, &drbd_bm_read, |
|
"read from attaching", BM_LOCKED_MASK)) { |
|
retcode = ERR_IO_MD_DISK; |
|
goto force_diskless_dec; |
|
} |
|
} |
|
|
|
if (_drbd_bm_total_weight(device) == drbd_bm_bits(device)) |
|
drbd_suspend_al(device); /* IO is still suspended here... */ |
|
|
|
spin_lock_irq(&device->resource->req_lock); |
|
os = drbd_read_state(device); |
|
ns = os; |
|
/* If MDF_CONSISTENT is not set go into inconsistent state, |
|
otherwise investigate MDF_WasUpToDate... |
|
If MDF_WAS_UP_TO_DATE is not set go into D_OUTDATED disk state, |
|
otherwise into D_CONSISTENT state. |
|
*/ |
|
if (drbd_md_test_flag(device->ldev, MDF_CONSISTENT)) { |
|
if (drbd_md_test_flag(device->ldev, MDF_WAS_UP_TO_DATE)) |
|
ns.disk = D_CONSISTENT; |
|
else |
|
ns.disk = D_OUTDATED; |
|
} else { |
|
ns.disk = D_INCONSISTENT; |
|
} |
|
|
|
if (drbd_md_test_flag(device->ldev, MDF_PEER_OUT_DATED)) |
|
ns.pdsk = D_OUTDATED; |
|
|
|
rcu_read_lock(); |
|
if (ns.disk == D_CONSISTENT && |
|
(ns.pdsk == D_OUTDATED || rcu_dereference(device->ldev->disk_conf)->fencing == FP_DONT_CARE)) |
|
ns.disk = D_UP_TO_DATE; |
|
|
|
/* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND, |
|
MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before |
|
this point, because drbd_request_state() modifies these |
|
flags. */ |
|
|
|
if (rcu_dereference(device->ldev->disk_conf)->al_updates) |
|
device->ldev->md.flags &= ~MDF_AL_DISABLED; |
|
else |
|
device->ldev->md.flags |= MDF_AL_DISABLED; |
|
|
|
rcu_read_unlock(); |
|
|
|
/* In case we are C_CONNECTED postpone any decision on the new disk |
|
state after the negotiation phase. */ |
|
if (device->state.conn == C_CONNECTED) { |
|
device->new_state_tmp.i = ns.i; |
|
ns.i = os.i; |
|
ns.disk = D_NEGOTIATING; |
|
|
|
/* We expect to receive up-to-date UUIDs soon. |
|
To avoid a race in receive_state, free p_uuid while |
|
holding req_lock. I.e. atomic with the state change */ |
|
kfree(device->p_uuid); |
|
device->p_uuid = NULL; |
|
} |
|
|
|
rv = _drbd_set_state(device, ns, CS_VERBOSE, NULL); |
|
spin_unlock_irq(&device->resource->req_lock); |
|
|
|
if (rv < SS_SUCCESS) |
|
goto force_diskless_dec; |
|
|
|
mod_timer(&device->request_timer, jiffies + HZ); |
|
|
|
if (device->state.role == R_PRIMARY) |
|
device->ldev->md.uuid[UI_CURRENT] |= (u64)1; |
|
else |
|
device->ldev->md.uuid[UI_CURRENT] &= ~(u64)1; |
|
|
|
drbd_md_mark_dirty(device); |
|
drbd_md_sync(device); |
|
|
|
kobject_uevent(&disk_to_dev(device->vdisk)->kobj, KOBJ_CHANGE); |
|
put_ldev(device); |
|
conn_reconfig_done(connection); |
|
mutex_unlock(&adm_ctx.resource->adm_mutex); |
|
drbd_adm_finish(&adm_ctx, info, retcode); |
|
return 0; |
|
|
|
force_diskless_dec: |
|
put_ldev(device); |
|
force_diskless: |
|
drbd_force_state(device, NS(disk, D_DISKLESS)); |
|
drbd_md_sync(device); |
|
fail: |
|
conn_reconfig_done(connection); |
|
if (nbc) { |
|
close_backing_dev(device, nbc->md_bdev, nbc->md_bdev != nbc->backing_bdev); |
|
close_backing_dev(device, nbc->backing_bdev, true); |
|
kfree(nbc); |
|
} |
|
kfree(new_disk_conf); |
|
lc_destroy(resync_lru); |
|
kfree(new_plan); |
|
mutex_unlock(&adm_ctx.resource->adm_mutex); |
|
finish: |
|
drbd_adm_finish(&adm_ctx, info, retcode); |
|
return 0; |
|
} |
|
|
|
static int adm_detach(struct drbd_device *device, int force) |
|
{ |
|
if (force) { |
|
set_bit(FORCE_DETACH, &device->flags); |
|
drbd_force_state(device, NS(disk, D_FAILED)); |
|
return SS_SUCCESS; |
|
} |
|
|
|
return drbd_request_detach_interruptible(device); |
|
} |
|
|
|
/* 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) |
|
{ |
|
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_shash *verify_tfm; |
|
struct crypto_shash *csums_tfm; |
|
struct crypto_shash *cram_hmac_tfm; |
|
struct crypto_shash *integrity_tfm; |
|
}; |
|
|
|
static int |
|
alloc_shash(struct crypto_shash **tfm, char *tfm_name, int err_alg) |
|
{ |
|
if (!tfm_name[0]) |
|
return NO_ERROR; |
|
|
|
*tfm = crypto_alloc_shash(tfm_name, 0, 0); |
|
if (IS_ERR(*tfm)) { |
|
*tfm = NULL; |
|
return err_alg; |
|
} |
|
|
|
return NO_ERROR; |
|
} |
|
|
|
static 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_shash(&crypto->csums_tfm, new_net_conf->csums_alg, |
|
ERR_CSUMS_ALG); |
|
if (rv != NO_ERROR) |
|
return rv; |
|
rv = alloc_shash(&crypto->verify_tfm, new_net_conf->verify_alg, |
|
ERR_VERIFY_ALG); |
|
if (rv != NO_ERROR) |
|
return rv; |
|
rv = alloc_shash(&crypto->integrity_tfm, new_net_conf->integrity_alg, |
|
ERR_INTEGRITY_ALG); |
|
if (rv != NO_ERROR) |
|
return rv; |
|
if (new_net_conf->cram_hmac_alg[0] != 0) { |
|
snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)", |
|
new_net_conf->cram_hmac_alg); |
|
|
|
rv = alloc_shash(&crypto->cram_hmac_tfm, hmac_name, |
|
ERR_AUTH_ALG); |
|
} |
|
|
|
return rv; |
|
} |
|
|
|
static void free_crypto(struct crypto *crypto) |
|
{ |
|
crypto_free_shash(crypto->cram_hmac_tfm); |
|
crypto_free_shash(crypto->integrity_tfm); |
|
crypto_free_shash(crypto->csums_tfm); |
|
crypto_free_shash(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_shash(connection->csums_tfm); |
|
connection->csums_tfm = crypto.csums_tfm; |
|
crypto.csums_tfm = NULL; |
|
} |
|
if (!ovr) { |
|
crypto_free_shash(connection->verify_tfm); |
|
connection->verify_tfm = crypto.verify_tfm; |
|
crypto.verify_tfm = NULL; |
|
} |
|
|
|
crypto_free_shash(connection->integrity_tfm); |
|
connection->integrity_tfm = crypto.integrity_tfm; |
|
if (connection->cstate >= C_WF_REPORT_PARAMS && connection->agreed_pro_version >= 100) |
|
/* Do this without trying to take connection->data.mutex again. */ |
|
__drbd_send_protocol(connection, P_PROTOCOL_UPDATE); |
|
|
|
crypto_free_shash(connection->cram_hmac_tfm); |
|
connection->cram_hmac_tfm = crypto.cram_hmac_tfm; |
|
|
|
mutex_unlock(&connection->resource->conf_update); |
|
mutex_unlock(&connection->data.mutex); |
|
synchronize_rcu(); |
|
kfree(old_net_conf); |
|
|
|
if (connection->cstate >= C_WF_REPORT_PARAMS) { |
|
struct drbd_peer_device *peer_device; |
|
int vnr; |
|
|
|
idr_for_each_entry(&connection->peer_devices, peer_device, vnr) |
|
drbd_send_sync_param(peer_device); |
|
} |
|
|
|
goto done; |
|
|
|
fail: |
|
mutex_unlock(&connection->resource->conf_update); |
|
mutex_unlock(&connection->data.mutex); |
|
free_crypto(&crypto); |
|
kfree(new_net_conf); |
|
done: |
|
conn_reconfig_done(connection); |
|
out: |
|
mutex_unlock(&adm_ctx.resource->adm_mutex); |
|
finish: |
|
drbd_adm_finish(&adm_ctx, info, retcode); |
|
return 0; |
|
} |
|
|
|
static void connection_to_info(struct connection_info *info, |
|
struct drbd_connection *connection) |
|
{ |
|
info->conn_connection_state = connection->cstate; |
|
info->conn_role = conn_highest_peer(connection); |
|
} |
|
|
|
static void peer_device_to_info(struct peer_device_info *info, |
|
struct drbd_peer_device *peer_device) |
|
{ |
|
struct drbd_device *device = peer_device->device; |
|
|
|
info->peer_repl_state = |
|
max_t(enum drbd_conns, C_WF_REPORT_PARAMS, device->state.conn); |
|
info->peer_disk_state = device->state.pdsk; |
|
info->peer_resync_susp_user = device->state.user_isp; |
|
info->peer_resync_susp_peer = device->state.peer_isp; |
|
info->peer_resync_susp_dependency = device->state.aftr_isp; |
|
} |
|
|
|
int drbd_adm_connect(struct sk_buff *skb, struct genl_info *info) |
|
{ |
|
struct connection_info connection_info; |
|
enum drbd_notification_type flags; |
|
unsigned int peer_devices = 0; |
|
struct drbd_config_context adm_ctx; |
|
struct drbd_peer_device *peer_device; |
|
struct net_conf *old_net_conf, *new_net_conf = NULL; |
|
struct crypto crypto = { }; |
|
struct drbd_resource *resource; |
|
struct drbd_connection *connection; |
|
enum drbd_ret_code retcode; |
|
int i; |
|
int err; |
|
|
|
retcode = drbd_adm_prepare(&adm_ctx, skb, info, DRBD_ADM_NEED_RESOURCE); |
|
|
|
if (!adm_ctx.reply_skb) |
|
return retcode; |
|
if (retcode != NO_ERROR) |
|
goto out; |
|
if (!(adm_ctx.my_addr && adm_ctx.peer_addr)) { |
|
drbd_msg_put_info(adm_ctx.reply_skb, "connection endpoint(s) missing"); |
|
retcode = ERR_INVALID_REQUEST; |
|
goto out; |
|
} |
|
|
|
/* No need for _rcu here. All reconfiguration is |
|
* strictly serialized on genl_lock(). We are protected against |
|
* concurrent reconfiguration/addition/deletion */ |
|
for_each_resource(resource, &drbd_resources) { |
|
for_each_connection(connection, resource) { |
|
if (nla_len(adm_ctx.my_addr) == connection->my_addr_len && |
|
!memcmp(nla_data(adm_ctx.my_addr), &connection->my_addr, |
|
connection->my_addr_len)) { |
|
retcode = ERR_LOCAL_ADDR; |
|
goto out; |
|
} |
|
|
|
if (nla_len(adm_ctx.peer_addr) == connection->peer_addr_len && |
|
!memcmp(nla_data(adm_ctx.peer_addr), &connection->peer_addr, |
|
connection->peer_addr_len)) { |
|
retcode = ERR_PEER_ADDR; |
|
goto out; |
|
} |
|
} |
|
} |
|
|
|
mutex_lock(&adm_ctx.resource->adm_mutex); |
|
connection = first_connection(adm_ctx.resource); |
|
conn_reconfig_start(connection); |
|
|
|
if (connection->cstate > C_STANDALONE) { |
|
retcode = ERR_NET_CONFIGURED; |
|
goto fail; |
|
} |
|
|
|
/* allocation not in the IO path, drbdsetup / netlink process context */ |
|
new_net_conf = kzalloc(sizeof(*new_net_conf), GFP_KERNEL); |
|
if (!new_net_conf) { |
|
retcode = ERR_NOMEM; |
|
goto fail; |
|
} |
|
|
|
set_net_conf_defaults(new_net_conf); |
|
|
|
err = net_conf_from_attrs(new_net_conf, info); |
|
if (err && err != -ENOMSG) { |
|
retcode = ERR_MANDATORY_TAG; |
|
drbd_msg_put_info(adm_ctx.reply_skb, from_attrs_err_to_txt(err)); |
|
goto fail; |
|
} |
|
|
|
retcode = check_net_options(connection, new_net_conf); |
|
if (retcode != NO_ERROR) |
|
goto fail; |
|
|
|
retcode = alloc_crypto(&crypto, new_net_conf); |
|
if (retcode != NO_ERROR) |
|
goto fail; |
|
|
|
((char *)new_net_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0; |
|
|
|
drbd_flush_workqueue(&connection->sender_work); |
|
|
|
mutex_lock(&adm_ctx.resource->conf_update); |
|
old_net_conf = connection->net_conf; |
|
if (old_net_conf) { |
|
retcode = ERR_NET_CONFIGURED; |
|
mutex_unlock(&adm_ctx.resource->conf_update); |
|
goto fail; |
|
} |
|
rcu_assign_pointer(connection->net_conf, new_net_conf); |
|
|
|
conn_free_crypto(connection); |
|
connection->cram_hmac_tfm = crypto.cram_hmac_tfm; |
|
connection->integrity_tfm = crypto.integrity_tfm; |
|
connection->csums_tfm = crypto.csums_tfm; |
|
connection->verify_tfm = crypto.verify_tfm; |
|
|
|
connection->my_addr_len = nla_len(adm_ctx.my_addr); |
|
memcpy(&connection->my_addr, nla_data(adm_ctx.my_addr), connection->my_addr_len); |
|
connection->peer_addr_len = nla_len(adm_ctx.peer_addr); |
|
memcpy(&connection->peer_addr, nla_data(adm_ctx.peer_addr), connection->peer_addr_len); |
|
|
|
idr_for_each_entry(&connection->peer_devices, peer_device, i) { |
|
peer_devices++; |
|
} |
|
|
|
connection_to_info(&connection_info, connection); |
|
flags = (peer_devices--) ? NOTIFY_CONTINUES : 0; |
|
mutex_lock(¬ification_mutex); |
|
notify_connection_state(NULL, 0, connection, &connection_info, NOTIFY_CREATE | flags); |
|
idr_for_each_entry(&connection->peer_devices, peer_device, i) { |
|
struct peer_device_info peer_device_info; |
|
|
|
peer_device_to_info(&peer_device_info, peer_device); |
|
flags = (peer_devices--) ? NOTIFY_CONTINUES : 0; |
|
notify_peer_device_state(NULL, 0, peer_device, &peer_device_info, NOTIFY_CREATE | flags); |
|
} |
|
mutex_unlock(¬ification_mutex); |
|
mutex_unlock(&adm_ctx.resource->conf_update); |
|
|
|
rcu_read_lock(); |
|
idr_for_each_entry(&connection->peer_devices, peer_device, i) { |
|
struct drbd_device *device = peer_device->device; |
|
device->send_cnt = 0; |
|
device->recv_cnt = 0; |
|
} |
|
rcu_read_unlock(); |
|
|
|
retcode = (enum drbd_ret_code)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_conns cstate; |
|
enum drbd_state_rv rv; |
|
|
|
repeat: |
|
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: |
|
spin_lock_irq(&connection->resource->req_lock); |
|
cstate = connection->cstate; |
|
spin_unlock_irq(&connection->resource->req_lock); |
|
if (cstate <= C_WF_CONNECTION) |
|
goto repeat; |
|
/* 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); |
|
/* Unlike in DRBD 9, the state engine has generated |
|
* NOTIFY_DESTROY events before clearing connection->net_conf. */ |
|
} |
|
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 = (enum drbd_ret_code)rv; |
|
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); |
|
new_disk_conf = NULL; |
|
} |
|
|
|
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); |
|
kfree(new_disk_conf); |
|
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)) { |
|
if (get_ldev_if_state(device, D_ATTACHING)) { |
|
drbd_uuid_new_current(device); |
|
put_ldev(device); |
|
} else { |
|
/* This is effectively a multi-stage "forced down". |
|
* The NEW_CUR_UUID bit is supposedly only set, if we |
|
* lost the replication connection, and are configured |
|
* to freeze IO and wait for some fence-peer handler. |
|
* So we still don't have a replication connection. |
|
* And now we don't have a local disk either. After |
|
* resume, we will fail all pending and new IO, because |
|
* we don't have any data anymore. Which means we will |
|
* eventually be able to terminate all users of this |
|
* device, and then take it down. By bumping the |
|
* "effective" data uuid, we make sure that you really |
|
* need to tear down before you reconfigure, we will |
|
* the refuse to re-connect or re-attach (because no |
|
* matching real data uuid exists). |
|
*/ |
|
u64 val; |
|
get_random_bytes(&val, sizeof(u64)); |
|
drbd_set_ed_uuid(device, val); |
|
drbd_warn(device, "Resumed without access to data; please tear down before attempting to re-configure.\n"); |
|
} |
|
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_noflag(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; |
|
} |
|
|
|
/* |
|
* The generic netlink dump callbacks are called outside the genl_lock(), so |
|
* they cannot use the simple attribute parsing code which uses global |
|
* attribute tables. |
|
*/ |
|
static struct nlattr *find_cfg_context_attr(const struct nlmsghdr *nlh, int attr) |
|
{ |
|
const unsigned hdrlen = GENL_HDRLEN + GENL_MAGIC_FAMILY_HDRSZ; |
|
const int maxtype = ARRAY_SIZE(drbd_cfg_context_nl_policy) - 1; |
|
struct nlattr *nla; |
|
|
|
nla = nla_find(nlmsg_attrdata(nlh, hdrlen), nlmsg_attrlen(nlh, hdrlen), |
|
DRBD_NLA_CFG_CONTEXT); |
|
if (!nla) |
|
return NULL; |
|
return drbd_nla_find_nested(maxtype, nla, __nla_type(attr)); |
|
} |
|
|
|
static void resource_to_info(struct resource_info *, struct drbd_resource *); |
|
|
|
int drbd_adm_dump_resources(struct sk_buff *skb, struct netlink_callback *cb) |
|
{ |
|
struct drbd_genlmsghdr *dh; |
|
struct drbd_resource *resource; |
|
struct resource_info resource_info; |
|
struct resource_statistics resource_statistics; |
|
int err; |
|
|
|
rcu_read_lock(); |
|
if (cb->args[0]) { |
|
for_each_resource_rcu(resource, &drbd_resources) |
|
if (resource == (struct drbd_resource *)cb->args[0]) |
|
goto found_resource; |
|
err = 0; /* resource was probably deleted */ |
|
goto out; |
|
} |
|
resource = list_entry(&drbd_resources, |
|
struct drbd_resource, resources); |
|
|
|
found_resource: |
|
list_for_each_entry_continue_rcu(resource, &drbd_resources, resources) { |
|
goto put_result; |
|
} |
|
err = 0; |
|
goto out; |
|
|
|
put_result: |
|
dh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, |
|
cb->nlh->nlmsg_seq, &drbd_genl_family, |
|
NLM_F_MULTI, DRBD_ADM_GET_RESOURCES); |
|
err = -ENOMEM; |
|
if (!dh) |
|
goto out; |
|
dh->minor = -1U; |
|
dh->ret_code = NO_ERROR; |
|
err = nla_put_drbd_cfg_context(skb, resource, NULL, NULL); |
|
if (err) |
|
goto out; |
|
err = res_opts_to_skb(skb, &resource->res_opts, !capable(CAP_SYS_ADMIN)); |
|
if (err) |
|
goto out; |
|
resource_to_info(&resource_info, resource); |
|
err = resource_info_to_skb(skb, &resource_info, !capable(CAP_SYS_ADMIN)); |
|
if (err) |
|
goto out; |
|
resource_statistics.res_stat_write_ordering = resource->write_ordering; |
|
err = resource_statistics_to_skb(skb, &resource_statistics, !capable(CAP_SYS_ADMIN)); |
|
if (err) |
|
goto out; |
|
cb->args[0] = (long)resource; |
|
genlmsg_end(skb, dh); |
|
err = 0; |
|
|
|
out: |
|
rcu_read_unlock(); |
|
if (err) |
|
return err; |
|
return skb->len; |
|
} |
|
|
|
static void device_to_statistics(struct device_statistics *s, |
|
struct drbd_device *device) |
|
{ |
|
memset(s, 0, sizeof(*s)); |
|
s->dev_upper_blocked = !may_inc_ap_bio(device); |
|
if (get_ldev(device)) { |
|
struct drbd_md *md = &device->ldev->md; |
|
u64 *history_uuids = (u64 *)s->history_uuids; |
|
int n; |
|
|
|
spin_lock_irq(&md->uuid_lock); |
|
s->dev_current_uuid = md->uuid[UI_CURRENT]; |
|
BUILD_BUG_ON(sizeof(s->history_uuids) < UI_HISTORY_END - UI_HISTORY_START + 1); |
|
for (n = 0; n < UI_HISTORY_END - UI_HISTORY_START + 1; n++) |
|
history_uuids[n] = md->uuid[UI_HISTORY_START + n]; |
|
for (; n < HISTORY_UUIDS; n++) |
|
history_uuids[n] = 0; |
|
s->history_uuids_len = HISTORY_UUIDS; |
|
spin_unlock_irq(&md->uuid_lock); |
|
|
|
s->dev_disk_flags = md->flags; |
|
put_ldev(device); |
|
} |
|
s->dev_size = get_capacity(device->vdisk); |
|
s->dev_read = device->read_cnt; |
|
s->dev_write = device->writ_cnt; |
|
s->dev_al_writes = device->al_writ_cnt; |
|
s->dev_bm_writes = device->bm_writ_cnt; |
|
s->dev_upper_pending = atomic_read(&device->ap_bio_cnt); |
|
s->dev_lower_pending = atomic_read(&device->local_cnt); |
|
s->dev_al_suspended = test_bit(AL_SUSPENDED, &device->flags); |
|
s->dev_exposed_data_uuid = device->ed_uuid; |
|
} |
|
|
|
static int put_resource_in_arg0(struct netlink_callback *cb, int holder_nr) |
|
{ |
|
if (cb->args[0]) { |
|
struct drbd_resource *resource = |
|
(struct drbd_resource *)cb->args[0]; |
|
kref_put(&resource->kref, drbd_destroy_resource); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
int drbd_adm_dump_devices_done(struct netlink_callback *cb) { |
|
return put_resource_in_arg0(cb, 7); |
|
} |
|
|
|
static void device_to_info(struct device_info *, struct drbd_device *); |
|
|
|
int drbd_adm_dump_devices(struct sk_buff *skb, struct netlink_callback *cb) |
|
{ |
|
struct nlattr *resource_filter; |
|
struct drbd_resource *resource; |
|
struct drbd_device *device; |
|
int minor, err, retcode; |
|
struct drbd_genlmsghdr *dh; |
|
struct device_info device_info; |
|
struct device_statistics device_statistics; |
|
struct idr *idr_to_search; |
|
|
|
resource = (struct drbd_resource *)cb->args[0]; |
|
if (!cb->args[0] && !cb->args[1]) { |
|
resource_filter = find_cfg_context_attr(cb->nlh, T_ctx_resource_name); |
|
if (resource_filter) { |
|
retcode = ERR_RES_NOT_KNOWN; |
|
resource = drbd_find_resource(nla_data(resource_filter)); |
|
if (!resource) |
|
goto put_result; |
|
cb->args[0] = (long)resource; |
|
} |
|
} |
|
|
|
rcu_read_lock(); |
|
minor = cb->args[1]; |
|
idr_to_search = resource ? &resource->devices : &drbd_devices; |
|
device = idr_get_next(idr_to_search, &minor); |
|
if (!device) { |
|
err = 0; |
|
goto out; |
|
} |
|
idr_for_each_entry_continue(idr_to_search, device, minor) { |
|
retcode = NO_ERROR; |
|
goto put_result; /* only one iteration */ |
|
} |
|
err = 0; |
|
goto out; /* no more devices */ |
|
|
|
put_result: |
|
dh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, |
|
cb->nlh->nlmsg_seq, &drbd_genl_family, |
|
NLM_F_MULTI, DRBD_ADM_GET_DEVICES); |
|
err = -ENOMEM; |
|
if (!dh) |
|
goto out; |
|
dh->ret_code = retcode; |
|
dh->minor = -1U; |
|
if (retcode == NO_ERROR) { |
|
dh->minor = device->minor; |
|
err = nla_put_drbd_cfg_context(skb, device->resource, NULL, device); |
|
if (err) |
|
goto out; |
|
if (get_ldev(device)) { |
|
struct disk_conf *disk_conf = |
|
rcu_dereference(device->ldev->disk_conf); |
|
|
|
err = disk_conf_to_skb(skb, disk_conf, !capable(CAP_SYS_ADMIN)); |
|
put_ldev(device); |
|
if (err) |
|
goto out; |
|
} |
|
device_to_info(&device_info, device); |
|
err = device_info_to_skb(skb, &device_info, !capable(CAP_SYS_ADMIN)); |
|
if (err) |
|
goto out; |
|
|
|
device_to_statistics(&device_statistics, device); |
|
err = device_statistics_to_skb(skb, &device_statistics, !capable(CAP_SYS_ADMIN)); |
|
if (err) |
|
goto out; |
|
cb->args[1] = minor + 1; |
|
} |
|
genlmsg_end(skb, dh); |
|
err = 0; |
|
|
|
out: |
|
rcu_read_unlock(); |
|
if (err) |
|
return err; |
|
return skb->len; |
|
} |
|
|
|
int drbd_adm_dump_connections_done(struct netlink_callback *cb) |
|
{ |
|
return put_resource_in_arg0(cb, 6); |
|
} |
|
|
|
enum { SINGLE_RESOURCE, ITERATE_RESOURCES }; |
|
|
|
int drbd_adm_dump_connections(struct sk_buff *skb, struct netlink_callback *cb) |
|
{ |
|
struct nlattr *resource_filter; |
|
struct drbd_resource *resource = NULL, *next_resource; |
|
struct drbd_connection *connection; |
|
int err = 0, retcode; |
|
struct drbd_genlmsghdr *dh; |
|
struct connection_info connection_info; |
|
struct connection_statistics connection_statistics; |
|
|
|
rcu_read_lock(); |
|
resource = (struct drbd_resource *)cb->args[0]; |
|
if (!cb->args[0]) { |
|
resource_filter = find_cfg_context_attr(cb->nlh, T_ctx_resource_name); |
|
if (resource_filter) { |
|
retcode = ERR_RES_NOT_KNOWN; |
|
resource = drbd_find_resource(nla_data(resource_filter)); |
|
if (!resource) |
|
goto put_result; |
|
cb->args[0] = (long)resource; |
|
cb->args[1] = SINGLE_RESOURCE; |
|
} |
|
} |
|
if (!resource) { |
|
if (list_empty(&drbd_resources)) |
|
goto out; |
|
resource = list_first_entry(&drbd_resources, struct drbd_resource, resources); |
|
kref_get(&resource->kref); |
|
cb->args[0] = (long)resource; |
|
cb->args[1] = ITERATE_RESOURCES; |
|
} |
|
|
|
next_resource: |
|
rcu_read_unlock(); |
|
mutex_lock(&resource->conf_update); |
|
rcu_read_lock(); |
|
if (cb->args[2]) { |
|
for_each_connection_rcu(connection, resource) |
|
if (connection == (struct drbd_connection *)cb->args[2]) |
|
goto found_connection; |
|
/* connection was probably deleted */ |
|
goto no_more_connections; |
|
} |
|
connection = list_entry(&resource->connections, struct drbd_connection, connections); |
|
|
|
found_connection: |
|
list_for_each_entry_continue_rcu(connection, &resource->connections, connections) { |
|
if (!has_net_conf(connection)) |
|
continue; |
|
retcode = NO_ERROR; |
|
goto put_result; /* only one iteration */ |
|
} |
|
|
|
no_more_connections: |
|
if (cb->args[1] == ITERATE_RESOURCES) { |
|
for_each_resource_rcu(next_resource, &drbd_resources) { |
|
if (next_resource == resource) |
|
goto found_resource; |
|
} |
|
/* resource was probably deleted */ |
|
} |
|
goto out; |
|
|
|
found_resource: |
|
list_for_each_entry_continue_rcu(next_resource, &drbd_resources, resources) { |
|
mutex_unlock(&resource->conf_update); |
|
kref_put(&resource->kref, drbd_destroy_resource); |
|
resource = next_resource; |
|
kref_get(&resource->kref); |
|
cb->args[0] = (long)resource; |
|
cb->args[2] = 0; |
|
goto next_resource; |
|
} |
|
goto out; /* no more resources */ |
|
|
|
put_result: |
|
dh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, |
|
cb->nlh->nlmsg_seq, &drbd_genl_family, |
|
NLM_F_MULTI, DRBD_ADM_GET_CONNECTIONS); |
|
err = -ENOMEM; |
|
if (!dh) |
|
goto out; |
|
dh->ret_code = retcode; |
|
dh->minor = -1U; |
|
if (retcode == NO_ERROR) { |
|
struct net_conf *net_conf; |
|
|
|
err = nla_put_drbd_cfg_context(skb, resource, connection, NULL); |
|
if (err) |
|
goto out; |
|
net_conf = rcu_dereference(connection->net_conf); |
|
if (net_conf) { |
|
err = net_conf_to_skb(skb, net_conf, !capable(CAP_SYS_ADMIN)); |
|
if (err) |
|
goto out; |
|
} |
|
connection_to_info(&connection_info, connection); |
|
err = connection_info_to_skb(skb, &connection_info, !capable(CAP_SYS_ADMIN)); |
|
if (err) |
|
goto out; |
|
connection_statistics.conn_congested = test_bit(NET_CONGESTED, &connection->flags); |
|
err = connection_statistics_to_skb(skb, &connection_statistics, !capable(CAP_SYS_ADMIN)); |
|
if (err) |
|
goto out; |
|
cb->args[2] = (long)connection; |
|
} |
|
genlmsg_end(skb, dh); |
|
err = 0; |
|
|
|
out: |
|
rcu_read_unlock(); |
|
if (resource) |
|
mutex_unlock(&resource->conf_update); |
|
if (err) |
|
return err; |
|
return skb->len; |
|
} |
|
|
|
enum mdf_peer_flag { |
|
MDF_PEER_CONNECTED = 1 << 0, |
|
MDF_PEER_OUTDATED = 1 << 1, |
|
MDF_PEER_FENCING = 1 << 2, |
|
MDF_PEER_FULL_SYNC = 1 << 3, |
|
}; |
|
|
|
static void peer_device_to_statistics(struct peer_device_statistics *s, |
|
struct drbd_peer_device *peer_device) |
|
{ |
|
struct drbd_device *device = peer_device->device; |
|
|
|
memset(s, 0, sizeof(*s)); |
|
s->peer_dev_received = device->recv_cnt; |
|
s->peer_dev_sent = device->send_cnt; |
|
s->peer_dev_pending = atomic_read(&device->ap_pending_cnt) + |
|
atomic_read(&device->rs_pending_cnt); |
|
s->peer_dev_unacked = atomic_read(&device->unacked_cnt); |
|
s->peer_dev_out_of_sync = drbd_bm_total_weight(device) << (BM_BLOCK_SHIFT - 9); |
|
s->peer_dev_resync_failed = device->rs_failed << (BM_BLOCK_SHIFT - 9); |
|
if (get_ldev(device)) { |
|
struct drbd_md *md = &device->ldev->md; |
|
|
|
spin_lock_irq(&md->uuid_lock); |
|
s->peer_dev_bitmap_uuid = md->uuid[UI_BITMAP]; |
|
spin_unlock_irq(&md->uuid_lock); |
|
s->peer_dev_flags = |
|
(drbd_md_test_flag(device->ldev, MDF_CONNECTED_IND) ? |
|
MDF_PEER_CONNECTED : 0) + |
|
(drbd_md_test_flag(device->ldev, MDF_CONSISTENT) && |
|
!drbd_md_test_flag(device->ldev, MDF_WAS_UP_TO_DATE) ? |
|
MDF_PEER_OUTDATED : 0) + |
|
/* FIXME: MDF_PEER_FENCING? */ |
|
(drbd_md_test_flag(device->ldev, MDF_FULL_SYNC) ? |
|
MDF_PEER_FULL_SYNC : 0); |
|
put_ldev(device); |
|
} |
|
} |
|
|
|
int drbd_adm_dump_peer_devices_done(struct netlink_callback *cb) |
|
{ |
|
return put_resource_in_arg0(cb, 9); |
|
} |
|
|
|
int drbd_adm_dump_peer_devices(struct sk_buff *skb, struct netlink_callback *cb) |
|
{ |
|
struct nlattr *resource_filter; |
|
struct drbd_resource *resource; |
|
struct drbd_device *device; |
|
struct drbd_peer_device *peer_device = NULL; |
|
int minor, err, retcode; |
|
struct drbd_genlmsghdr *dh; |
|
struct idr *idr_to_search; |
|
|
|
resource = (struct drbd_resource *)cb->args[0]; |
|
if (!cb->args[0] && !cb->args[1]) { |
|
resource_filter = find_cfg_context_attr(cb->nlh, T_ctx_resource_name); |
|
if (resource_filter) { |
|
retcode = ERR_RES_NOT_KNOWN; |
|
resource = drbd_find_resource(nla_data(resource_filter)); |
|
if (!resource) |
|
goto put_result; |
|
} |
|
cb->args[0] = (long)resource; |
|
} |
|
|
|
rcu_read_lock(); |
|
minor = cb->args[1]; |
|
idr_to_search = resource ? &resource->devices : &drbd_devices; |
|
device = idr_find(idr_to_search, minor); |
|
if (!device) { |
|
next_device: |
|
minor++; |
|
cb->args[2] = 0; |
|
device = idr_get_next(idr_to_search, &minor); |
|
if (!device) { |
|
err = 0; |
|
goto out; |
|
} |
|
} |
|
if (cb->args[2]) { |
|
for_each_peer_device(peer_device, device) |
|
if (peer_device == (struct drbd_peer_device *)cb->args[2]) |
|
goto found_peer_device; |
|
/* peer device was probably deleted */ |
|
goto next_device; |
|
} |
|
/* Make peer_device point to the list head (not the first entry). */ |
|
peer_device = list_entry(&device->peer_devices, struct drbd_peer_device, peer_devices); |
|
|
|
found_peer_device: |
|
list_for_each_entry_continue_rcu(peer_device, &device->peer_devices, peer_devices) { |
|
if (!has_net_conf(peer_device->connection)) |
|
continue; |
|
retcode = NO_ERROR; |
|
goto put_result; /* only one iteration */ |
|
} |
|
goto next_device; |
|
|
|
put_result: |
|
dh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, |
|
cb->nlh->nlmsg_seq, &drbd_genl_family, |
|
NLM_F_MULTI, DRBD_ADM_GET_PEER_DEVICES); |
|
err = -ENOMEM; |
|
if (!dh) |
|
goto out; |
|
dh->ret_code = retcode; |
|
dh->minor = -1U; |
|
if (retcode == NO_ERROR) { |
|
struct peer_device_info peer_device_info; |
|
struct peer_device_statistics peer_device_statistics; |
|
|
|
dh->minor = minor; |
|
err = nla_put_drbd_cfg_context(skb, device->resource, peer_device->connection, device); |
|
if (err) |
|
goto out; |
|
peer_device_to_info(&peer_device_info, peer_device); |
|
err = peer_device_info_to_skb(skb, &peer_device_info, !capable(CAP_SYS_ADMIN)); |
|
if (err) |
|
goto out; |
|
peer_device_to_statistics(&peer_device_statistics, peer_device); |
|
err = peer_device_statistics_to_skb(skb, &peer_device_statistics, !capable(CAP_SYS_ADMIN)); |
|
if (err) |
|
goto out; |
|
cb->args[1] = minor; |
|
cb->args[2] = (long)peer_device; |
|
} |
|
genlmsg_end(skb, dh); |
|
err = 0; |
|
|
|
out: |
|
rcu_read_unlock(); |
|
if (err) |
|
return err; |
|
return skb->len; |
|
} |
|
/* |
|
* 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_noflag(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_0pad(skb, T_ed_uuid, device->ed_uuid) || |
|
nla_put_u64_0pad(skb, T_capacity, get_capacity(device->vdisk)) || |
|
nla_put_u64_0pad(skb, T_send_cnt, device->send_cnt) || |
|
nla_put_u64_0pad(skb, T_recv_cnt, device->recv_cnt) || |
|
nla_put_u64_0pad(skb, T_read_cnt, device->read_cnt) || |
|
nla_put_u64_0pad(skb, T_writ_cnt, device->writ_cnt) || |
|
nla_put_u64_0pad(skb, T_al_writ_cnt, device->al_writ_cnt) || |
|
nla_put_u64_0pad(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_0pad(skb, T_bits_total, drbd_bm_bits(device)) || |
|
nla_put_u64_0pad(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_0pad(skb, T_bits_rs_total, |
|
device->rs_total) || |
|
nla_put_u64_0pad(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; |
|
fallthrough; |
|
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; |
|
} |
|
|
|
static void resource_to_info(struct resource_info *info, |
|
struct drbd_resource *resource) |
|
{ |
|
info->res_role = conn_highest_role(first_connection(resource)); |
|
info->res_susp = resource->susp; |
|
info->res_susp_nod = resource->susp_nod; |
|
info->res_susp_fen = resource->susp_fen; |
|
} |
|
|
|
int drbd_adm_new_resource(struct sk_buff *skb, struct genl_info *info) |
|
{ |
|
struct drbd_connection *connection; |
|
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 */ |
|
mutex_lock(&resources_mutex); |
|
connection = conn_create(adm_ctx.resource_name, &res_opts); |
|
mutex_unlock(&resources_mutex); |
|
|
|
if (connection) { |
|
struct resource_info resource_info; |
|
|
|
mutex_lock(¬ification_mutex); |
|
resource_to_info(&resource_info, connection->resource); |
|
notify_resource_state(NULL, 0, connection->resource, |
|
&resource_info, NOTIFY_CREATE); |
|
mutex_unlock(¬ification_mutex); |
|
} else |
|
retcode = ERR_NOMEM; |
|
|
|
out: |
|
drbd_adm_finish(&adm_ctx, info, retcode); |
|
return 0; |
|
} |
|
|
|
static void device_to_info(struct device_info *info, |
|
struct drbd_device *device) |
|
{ |
|
info->dev_disk_state = device->state.disk; |
|
} |
|
|
|
|
|
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); |
|
if (retcode == NO_ERROR) { |
|
struct drbd_device *device; |
|
struct drbd_peer_device *peer_device; |
|
struct device_info info; |
|
unsigned int peer_devices = 0; |
|
enum drbd_notification_type flags; |
|
|
|
device = minor_to_device(dh->minor); |
|
for_each_peer_device(peer_device, device) { |
|
if (!has_net_conf(peer_device->connection)) |
|
continue; |
|
peer_devices++; |
|
} |
|
|
|
device_to_info(&info, device); |
|
mutex_lock(¬ification_mutex); |
|
flags = (peer_devices--) ? NOTIFY_CONTINUES : 0; |
|
notify_device_state(NULL, 0, device, &info, NOTIFY_CREATE | flags); |
|
for_each_peer_device(peer_device, device) { |
|
struct peer_device_info peer_device_info; |
|
|
|
if (!has_net_conf(peer_device->connection)) |
|
continue; |
|
peer_device_to_info(&peer_device_info, peer_device); |
|
flags = (peer_devices--) ? NOTIFY_CONTINUES : 0; |
|
notify_peer_device_state(NULL, 0, peer_device, &peer_device_info, |
|
NOTIFY_CREATE | flags); |
|
} |
|
mutex_unlock(¬ification_mutex); |
|
} |
|
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) |
|
{ |
|
struct drbd_peer_device *peer_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) { |
|
struct drbd_connection *connection = |
|
first_connection(device->resource); |
|
|
|
_drbd_request_state(device, NS(conn, C_WF_REPORT_PARAMS), |
|
CS_VERBOSE + CS_WAIT_COMPLETE); |
|
|
|
/* If the state engine hasn't stopped the sender thread yet, we |
|
* need to flush the sender work queue before generating the |
|
* DESTROY events here. */ |
|
if (get_t_state(&connection->worker) == RUNNING) |
|
drbd_flush_workqueue(&connection->sender_work); |
|
|
|
mutex_lock(¬ification_mutex); |
|
for_each_peer_device(peer_device, device) { |
|
if (!has_net_conf(peer_device->connection)) |
|
continue; |
|
notify_peer_device_state(NULL, 0, peer_device, NULL, |
|
NOTIFY_DESTROY | NOTIFY_CONTINUES); |
|
} |
|
notify_device_state(NULL, 0, device, NULL, NOTIFY_DESTROY); |
|
mutex_unlock(¬ification_mutex); |
|
|
|
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; |
|
|
|
/* The state engine has stopped the sender thread, so we don't |
|
* need to flush the sender work queue before generating the |
|
* DESTROY event here. */ |
|
mutex_lock(¬ification_mutex); |
|
notify_resource_state(NULL, 0, resource, NULL, NOTIFY_DESTROY); |
|
mutex_unlock(¬ification_mutex); |
|
|
|
mutex_lock(&resources_mutex); |
|
list_del_rcu(&resource->resources); |
|
mutex_unlock(&resources_mutex); |
|
/* 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) |
|
{ |
|
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, GFP_NOWAIT); |
|
/* 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); |
|
} |
|
|
|
static int nla_put_notification_header(struct sk_buff *msg, |
|
enum drbd_notification_type type) |
|
{ |
|
struct drbd_notification_header nh = { |
|
.nh_type = type, |
|
}; |
|
|
|
return drbd_notification_header_to_skb(msg, &nh, true); |
|
} |
|
|
|
void notify_resource_state(struct sk_buff *skb, |
|
unsigned int seq, |
|
struct drbd_resource *resource, |
|
struct resource_info *resource_info, |
|
enum drbd_notification_type type) |
|
{ |
|
struct resource_statistics resource_statistics; |
|
struct drbd_genlmsghdr *dh; |
|
bool multicast = false; |
|
int err; |
|
|
|
if (!skb) { |
|
seq = atomic_inc_return(¬ify_genl_seq); |
|
skb = genlmsg_new(NLMSG_GOODSIZE, GFP_NOIO); |
|
err = -ENOMEM; |
|
if (!skb) |
|
goto failed; |
|
multicast = true; |
|
} |
|
|
|
err = -EMSGSIZE; |
|
dh = genlmsg_put(skb, 0, seq, &drbd_genl_family, 0, DRBD_RESOURCE_STATE); |
|
if (!dh) |
|
goto nla_put_failure; |
|
dh->minor = -1U; |
|
dh->ret_code = NO_ERROR; |
|
if (nla_put_drbd_cfg_context(skb, resource, NULL, NULL) || |
|
nla_put_notification_header(skb, type) || |
|
((type & ~NOTIFY_FLAGS) != NOTIFY_DESTROY && |
|
resource_info_to_skb(skb, resource_info, true))) |
|
goto nla_put_failure; |
|
resource_statistics.res_stat_write_ordering = resource->write_ordering; |
|
err = resource_statistics_to_skb(skb, &resource_statistics, !capable(CAP_SYS_ADMIN)); |
|
if (err) |
|
goto nla_put_failure; |
|
genlmsg_end(skb, dh); |
|
if (multicast) { |
|
err = drbd_genl_multicast_events(skb, GFP_NOWAIT); |
|
/* skb has been consumed or freed in netlink_broadcast() */ |
|
if (err && err != -ESRCH) |
|
goto failed; |
|
} |
|
return; |
|
|
|
nla_put_failure: |
|
nlmsg_free(skb); |
|
failed: |
|
drbd_err(resource, "Error %d while broadcasting event. Event seq:%u\n", |
|
err, seq); |
|
} |
|
|
|
void notify_device_state(struct sk_buff *skb, |
|
unsigned int seq, |
|
struct drbd_device *device, |
|
struct device_info *device_info, |
|
enum drbd_notification_type type) |
|
{ |
|
struct device_statistics device_statistics; |
|
struct drbd_genlmsghdr *dh; |
|
bool multicast = false; |
|
int err; |
|
|
|
if (!skb) { |
|
seq = atomic_inc_return(¬ify_genl_seq); |
|
skb = genlmsg_new(NLMSG_GOODSIZE, GFP_NOIO); |
|
err = -ENOMEM; |
|
if (!skb) |
|
goto failed; |
|
multicast = true; |
|
} |
|
|
|
err = -EMSGSIZE; |
|
dh = genlmsg_put(skb, 0, seq, &drbd_genl_family, 0, DRBD_DEVICE_STATE); |
|
if (!dh) |
|
goto nla_put_failure; |
|
dh->minor = device->minor; |
|
dh->ret_code = NO_ERROR; |
|
if (nla_put_drbd_cfg_context(skb, device->resource, NULL, device) || |
|
nla_put_notification_header(skb, type) || |
|
((type & ~NOTIFY_FLAGS) != NOTIFY_DESTROY && |
|
device_info_to_skb(skb, device_info, true))) |
|
goto nla_put_failure; |
|
device_to_statistics(&device_statistics, device); |
|
device_statistics_to_skb(skb, &device_statistics, !capable(CAP_SYS_ADMIN)); |
|
genlmsg_end(skb, dh); |
|
if (multicast) { |
|
err = drbd_genl_multicast_events(skb, GFP_NOWAIT); |
|
/* skb has been consumed or freed in netlink_broadcast() */ |
|
if (err && err != -ESRCH) |
|
goto failed; |
|
} |
|
return; |
|
|
|
nla_put_failure: |
|
nlmsg_free(skb); |
|
failed: |
|
drbd_err(device, "Error %d while broadcasting event. Event seq:%u\n", |
|
err, seq); |
|
} |
|
|
|
void notify_connection_state(struct sk_buff *skb, |
|
unsigned int seq, |
|
struct drbd_connection *connection, |
|
struct connection_info *connection_info, |
|
enum drbd_notification_type type) |
|
{ |
|
struct connection_statistics connection_statistics; |
|
struct drbd_genlmsghdr *dh; |
|
bool multicast = false; |
|
int err; |
|
|
|
if (!skb) { |
|
seq = atomic_inc_return(¬ify_genl_seq); |
|
skb = genlmsg_new(NLMSG_GOODSIZE, GFP_NOIO); |
|
err = -ENOMEM; |
|
if (!skb) |
|
goto failed; |
|
multicast = true; |
|
} |
|
|
|
err = -EMSGSIZE; |
|
dh = genlmsg_put(skb, 0, seq, &drbd_genl_family, 0, DRBD_CONNECTION_STATE); |
|
if (!dh) |
|
goto nla_put_failure; |
|
dh->minor = -1U; |
|
dh->ret_code = NO_ERROR; |
|
if (nla_put_drbd_cfg_context(skb, connection->resource, connection, NULL) || |
|
nla_put_notification_header(skb, type) || |
|
((type & ~NOTIFY_FLAGS) != NOTIFY_DESTROY && |
|
connection_info_to_skb(skb, connection_info, true))) |
|
goto nla_put_failure; |
|
connection_statistics.conn_congested = test_bit(NET_CONGESTED, &connection->flags); |
|
connection_statistics_to_skb(skb, &connection_statistics, !capable(CAP_SYS_ADMIN)); |
|
genlmsg_end(skb, dh); |
|
if (multicast) { |
|
err = drbd_genl_multicast_events(skb, GFP_NOWAIT); |
|
/* skb has been consumed or freed in netlink_broadcast() */ |
|
if (err && err != -ESRCH) |
|
goto failed; |
|
} |
|
return; |
|
|
|
nla_put_failure: |
|
nlmsg_free(skb); |
|
failed: |
|
drbd_err(connection, "Error %d while broadcasting event. Event seq:%u\n", |
|
err, seq); |
|
} |
|
|
|
void notify_peer_device_state(struct sk_buff *skb, |
|
unsigned int seq, |
|
struct drbd_peer_device *peer_device, |
|
struct peer_device_info *peer_device_info, |
|
enum drbd_notification_type type) |
|
{ |
|
struct peer_device_statistics peer_device_statistics; |
|
struct drbd_resource *resource = peer_device->device->resource; |
|
struct drbd_genlmsghdr *dh; |
|
bool multicast = false; |
|
int err; |
|
|
|
if (!skb) { |
|
seq = atomic_inc_return(¬ify_genl_seq); |
|
skb = genlmsg_new(NLMSG_GOODSIZE, GFP_NOIO); |
|
err = -ENOMEM; |
|
if (!skb) |
|
goto failed; |
|
multicast = true; |
|
} |
|
|
|
err = -EMSGSIZE; |
|
dh = genlmsg_put(skb, 0, seq, &drbd_genl_family, 0, DRBD_PEER_DEVICE_STATE); |
|
if (!dh) |
|
goto nla_put_failure; |
|
dh->minor = -1U; |
|
dh->ret_code = NO_ERROR; |
|
if (nla_put_drbd_cfg_context(skb, resource, peer_device->connection, peer_device->device) || |
|
nla_put_notification_header(skb, type) || |
|
((type & ~NOTIFY_FLAGS) != NOTIFY_DESTROY && |
|
peer_device_info_to_skb(skb, peer_device_info, true))) |
|
goto nla_put_failure; |
|
peer_device_to_statistics(&peer_device_statistics, peer_device); |
|
peer_device_statistics_to_skb(skb, &peer_device_statistics, !capable(CAP_SYS_ADMIN)); |
|
genlmsg_end(skb, dh); |
|
if (multicast) { |
|
err = drbd_genl_multicast_events(skb, GFP_NOWAIT); |
|
/* skb has been consumed or freed in netlink_broadcast() */ |
|
if (err && err != -ESRCH) |
|
goto failed; |
|
} |
|
return; |
|
|
|
nla_put_failure: |
|
nlmsg_free(skb); |
|
failed: |
|
drbd_err(peer_device, "Error %d while broadcasting event. Event seq:%u\n", |
|
err, seq); |
|
} |
|
|
|
void notify_helper(enum drbd_notification_type type, |
|
struct drbd_device *device, struct drbd_connection *connection, |
|
const char *name, int status) |
|
{ |
|
struct drbd_resource *resource = device ? device->resource : connection->resource; |
|
struct drbd_helper_info helper_info; |
|
unsigned int seq = atomic_inc_return(¬ify_genl_seq); |
|
struct sk_buff *skb = NULL; |
|
struct drbd_genlmsghdr *dh; |
|
int err; |
|
|
|
strlcpy(helper_info.helper_name, name, sizeof(helper_info.helper_name)); |
|
helper_info.helper_name_len = min(strlen(name), sizeof(helper_info.helper_name)); |
|
helper_info.helper_status = status; |
|
|
|
skb = genlmsg_new(NLMSG_GOODSIZE, GFP_NOIO); |
|
err = -ENOMEM; |
|
if (!skb) |
|
goto fail; |
|
|
|
err = -EMSGSIZE; |
|
dh = genlmsg_put(skb, 0, seq, &drbd_genl_family, 0, DRBD_HELPER); |
|
if (!dh) |
|
goto fail; |
|
dh->minor = device ? device->minor : -1; |
|
dh->ret_code = NO_ERROR; |
|
mutex_lock(¬ification_mutex); |
|
if (nla_put_drbd_cfg_context(skb, resource, connection, device) || |
|
nla_put_notification_header(skb, type) || |
|
drbd_helper_info_to_skb(skb, &helper_info, true)) |
|
goto unlock_fail; |
|
genlmsg_end(skb, dh); |
|
err = drbd_genl_multicast_events(skb, GFP_NOWAIT); |
|
skb = NULL; |
|
/* skb has been consumed or freed in netlink_broadcast() */ |
|
if (err && err != -ESRCH) |
|
goto unlock_fail; |
|
mutex_unlock(¬ification_mutex); |
|
return; |
|
|
|
unlock_fail: |
|
mutex_unlock(¬ification_mutex); |
|
fail: |
|
nlmsg_free(skb); |
|
drbd_err(resource, "Error %d while broadcasting event. Event seq:%u\n", |
|
err, seq); |
|
} |
|
|
|
static void notify_initial_state_done(struct sk_buff *skb, unsigned int seq) |
|
{ |
|
struct drbd_genlmsghdr *dh; |
|
int err; |
|
|
|
err = -EMSGSIZE; |
|
dh = genlmsg_put(skb, 0, seq, &drbd_genl_family, 0, DRBD_INITIAL_STATE_DONE); |
|
if (!dh) |
|
goto nla_put_failure; |
|
dh->minor = -1U; |
|
dh->ret_code = NO_ERROR; |
|
if (nla_put_notification_header(skb, NOTIFY_EXISTS)) |
|
goto nla_put_failure; |
|
genlmsg_end(skb, dh); |
|
return; |
|
|
|
nla_put_failure: |
|
nlmsg_free(skb); |
|
pr_err("Error %d sending event. Event seq:%u\n", err, seq); |
|
} |
|
|
|
static void free_state_changes(struct list_head *list) |
|
{ |
|
while (!list_empty(list)) { |
|
struct drbd_state_change *state_change = |
|
list_first_entry(list, struct drbd_state_change, list); |
|
list_del(&state_change->list); |
|
forget_state_change(state_change); |
|
} |
|
} |
|
|
|
static unsigned int notifications_for_state_change(struct drbd_state_change *state_change) |
|
{ |
|
return 1 + |
|
state_change->n_connections + |
|
state_change->n_devices + |
|
state_change->n_devices * state_change->n_connections; |
|
} |
|
|
|
static int get_initial_state(struct sk_buff *skb, struct netlink_callback *cb) |
|
{ |
|
struct drbd_state_change *state_change = (struct drbd_state_change *)cb->args[0]; |
|
unsigned int seq = cb->args[2]; |
|
unsigned int n; |
|
enum drbd_notification_type flags = 0; |
|
|
|
/* There is no need for taking notification_mutex here: it doesn't |
|
matter if the initial state events mix with later state chage |
|
events; we can always tell the events apart by the NOTIFY_EXISTS |
|
flag. */ |
|
|
|
cb->args[5]--; |
|
if (cb->args[5] == 1) { |
|
notify_initial_state_done(skb, seq); |
|
goto out; |
|
} |
|
n = cb->args[4]++; |
|
if (cb->args[4] < cb->args[3]) |
|
flags |= NOTIFY_CONTINUES; |
|
if (n < 1) { |
|
notify_resource_state_change(skb, seq, state_change->resource, |
|
NOTIFY_EXISTS | flags); |
|
goto next; |
|
} |
|
n--; |
|
if (n < state_change->n_connections) { |
|
notify_connection_state_change(skb, seq, &state_change->connections[n], |
|
NOTIFY_EXISTS | flags); |
|
goto next; |
|
} |
|
n -= state_change->n_connections; |
|
if (n < state_change->n_devices) { |
|
notify_device_state_change(skb, seq, &state_change->devices[n], |
|
NOTIFY_EXISTS | flags); |
|
goto next; |
|
} |
|
n -= state_change->n_devices; |
|
if (n < state_change->n_devices * state_change->n_connections) { |
|
notify_peer_device_state_change(skb, seq, &state_change->peer_devices[n], |
|
NOTIFY_EXISTS | flags); |
|
goto next; |
|
} |
|
|
|
next: |
|
if (cb->args[4] == cb->args[3]) { |
|
struct drbd_state_change *next_state_change = |
|
list_entry(state_change->list.next, |
|
struct drbd_state_change, list); |
|
cb->args[0] = (long)next_state_change; |
|
cb->args[3] = notifications_for_state_change(next_state_change); |
|
cb->args[4] = 0; |
|
} |
|
out: |
|
return skb->len; |
|
} |
|
|
|
int drbd_adm_get_initial_state(struct sk_buff *skb, struct netlink_callback *cb) |
|
{ |
|
struct drbd_resource *resource; |
|
LIST_HEAD(head); |
|
|
|
if (cb->args[5] >= 1) { |
|
if (cb->args[5] > 1) |
|
return get_initial_state(skb, cb); |
|
if (cb->args[0]) { |
|
struct drbd_state_change *state_change = |
|
(struct drbd_state_change *)cb->args[0]; |
|
|
|
/* connect list to head */ |
|
list_add(&head, &state_change->list); |
|
free_state_changes(&head); |
|
} |
|
return 0; |
|
} |
|
|
|
cb->args[5] = 2; /* number of iterations */ |
|
mutex_lock(&resources_mutex); |
|
for_each_resource(resource, &drbd_resources) { |
|
struct drbd_state_change *state_change; |
|
|
|
state_change = remember_old_state(resource, GFP_KERNEL); |
|
if (!state_change) { |
|
if (!list_empty(&head)) |
|
free_state_changes(&head); |
|
mutex_unlock(&resources_mutex); |
|
return -ENOMEM; |
|
} |
|
copy_old_to_new_state_change(state_change); |
|
list_add_tail(&state_change->list, &head); |
|
cb->args[5] += notifications_for_state_change(state_change); |
|
} |
|
mutex_unlock(&resources_mutex); |
|
|
|
if (!list_empty(&head)) { |
|
struct drbd_state_change *state_change = |
|
list_entry(head.next, struct drbd_state_change, list); |
|
cb->args[0] = (long)state_change; |
|
cb->args[3] = notifications_for_state_change(state_change); |
|
list_del(&head); /* detach list from head */ |
|
} |
|
|
|
cb->args[2] = cb->nlh->nlmsg_seq; |
|
return get_initial_state(skb, cb); |
|
}
|
|
|