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67957bd59e
This is a huge patch with many changes, all about the DNS. Initially, the idea was to update the DNS part to ease the threads support integration. But quickly, I started to refactor some parts. And after several iterations, it was impossible for me to commit the different parts atomically. So, instead of adding tens of patches, often reworking the same parts, it was easier to merge all my changes in a uniq patch. Here are all changes made on the DNS. First, the DNS initialization has been refactored. The DNS configuration parsing remains untouched, in cfgparse.c. But all checks have been moved in a post-check callback. In the function dns_finalize_config, for each resolvers, the nameservers configuration is tested and the task used to manage DNS resolutions is created. The links between the backend's servers and the resolvers are also created at this step. Here no connection are kept alive. So there is no needs anymore to reopen them after HAProxy fork. Connections used to send DNS queries will be opened on demand. Then, the way DNS requesters are linked to a DNS resolution has been reworked. The resolution used by a requester is now referenced into the dns_requester structure and the resolution pointers in server and dns_srvrq structures have been removed. wait and curr list of requesters, for a DNS resolution, have been replaced by a uniq list. And Finally, the way a requester is removed from a DNS resolution has been simplified. Now everything is done in dns_unlink_resolution. srv_set_fqdn function has been simplified. Now, there is only 1 way to set the server's FQDN, independently it is done by the CLI or when a SRV record is resolved. The static DNS resolutions pool has been replaced by a dynamoc pool. The part has been modified by Baptiste Assmann. The way the DNS resolutions are triggered by the task or by a health-check has been totally refactored. Now, all timeouts are respected. Especially hold.valid. The default frequency to wake up a resolvers is now configurable using "timeout resolve" parameter. Now, as documented, as long as invalid repsonses are received, we really wait all name servers responses before retrying. As far as possible, resources allocated during DNS configuration parsing are releases when HAProxy is shutdown. Beside all these changes, the code has been cleaned to ease code review and the doc has been updated.
246 lines
8.5 KiB
C
246 lines
8.5 KiB
C
/*
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* include/proto/server.h
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* This file defines everything related to servers.
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*
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* Copyright (C) 2000-2009 Willy Tarreau - w@1wt.eu
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation, version 2.1
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* exclusively.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _PROTO_SERVER_H
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#define _PROTO_SERVER_H
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#include <unistd.h>
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#include <common/config.h>
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#include <common/time.h>
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#include <types/applet.h>
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#include <types/dns.h>
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#include <types/proxy.h>
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#include <types/queue.h>
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#include <types/server.h>
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#include <proto/queue.h>
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#include <proto/log.h>
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#include <proto/freq_ctr.h>
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int srv_downtime(const struct server *s);
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int srv_lastsession(const struct server *s);
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int srv_getinter(const struct check *check);
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int parse_server(const char *file, int linenum, char **args, struct proxy *curproxy, struct proxy *defproxy);
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int update_server_addr(struct server *s, void *ip, int ip_sin_family, const char *updater);
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const char *update_server_addr_port(struct server *s, const char *addr, const char *port, char *updater);
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struct server *server_find_by_id(struct proxy *bk, int id);
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struct server *server_find_by_name(struct proxy *bk, const char *name);
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struct server *server_find_best_match(struct proxy *bk, char *name, int id, int *diff);
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void apply_server_state(void);
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void srv_compute_all_admin_states(struct proxy *px);
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int srv_set_addr_via_libc(struct server *srv, int *err_code);
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int srv_init_addr(void);
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struct server *cli_find_server(struct appctx *appctx, char *arg);
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void servers_update_status(void);
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extern struct list updated_servers;
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/* functions related to server name resolution */
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int snr_update_srv_status(struct server *s, int has_no_ip);
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const char *update_server_fqdn(struct server *server, const char *fqdn, const char *updater);
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int snr_resolution_cb(struct dns_requester *requester, struct dns_nameserver *nameserver);
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int snr_resolution_error_cb(struct dns_requester *requester, int error_code);
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struct server *snr_check_ip_callback(struct server *srv, void *ip, unsigned char *ip_family);
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/* increase the number of cumulated connections on the designated server */
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static void inline srv_inc_sess_ctr(struct server *s)
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{
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s->counters.cum_sess++;
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update_freq_ctr(&s->sess_per_sec, 1);
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if (s->sess_per_sec.curr_ctr > s->counters.sps_max)
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s->counters.sps_max = s->sess_per_sec.curr_ctr;
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}
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/* set the time of last session on the designated server */
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static void inline srv_set_sess_last(struct server *s)
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{
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s->counters.last_sess = now.tv_sec;
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}
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/*
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* Registers the server keyword list <kwl> as a list of valid keywords for next
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* parsing sessions.
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*/
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void srv_register_keywords(struct srv_kw_list *kwl);
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/* Return a pointer to the server keyword <kw>, or NULL if not found. */
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struct srv_kw *srv_find_kw(const char *kw);
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/* Dumps all registered "server" keywords to the <out> string pointer. */
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void srv_dump_kws(char **out);
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/* Recomputes the server's eweight based on its state, uweight, the current time,
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* and the proxy's algorihtm. To be used after updating sv->uweight. The warmup
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* state is automatically disabled if the time is elapsed.
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*/
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void server_recalc_eweight(struct server *sv);
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/* returns the current server throttle rate between 0 and 100% */
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static inline unsigned int server_throttle_rate(struct server *sv)
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{
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struct proxy *px = sv->proxy;
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/* when uweight is 0, we're in soft-stop so that cannot be a slowstart,
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* thus the throttle is 100%.
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*/
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if (!sv->uweight)
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return 100;
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return (100U * px->lbprm.wmult * sv->cur_eweight + px->lbprm.wdiv - 1) / (px->lbprm.wdiv * sv->uweight);
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}
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/*
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* Parses weight_str and configures sv accordingly.
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* Returns NULL on success, error message string otherwise.
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*/
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const char *server_parse_weight_change_request(struct server *sv,
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const char *weight_str);
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/*
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* Parses addr_str and configures sv accordingly. updater precise
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* the source of the change in the associated message log.
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* Returns NULL on success, error message string otherwise.
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*/
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const char *server_parse_addr_change_request(struct server *sv,
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const char *addr_str, const char *updater);
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/*
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* Parses maxconn_str and configures sv accordingly.
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* Returns NULL on success, error message string otherwise.
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*/
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const char *server_parse_maxconn_change_request(struct server *sv,
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const char *maxconn_str);
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/*
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* Return true if the server has a zero user-weight, meaning it's in draining
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* mode (ie: not taking new non-persistent connections).
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*/
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static inline int server_is_draining(const struct server *s)
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{
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return !s->uweight || (s->cur_admin & SRV_ADMF_DRAIN);
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}
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/* Shutdown all connections of a server. The caller must pass a termination
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* code in <why>, which must be one of SF_ERR_* indicating the reason for the
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* shutdown.
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*/
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void srv_shutdown_streams(struct server *srv, int why);
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/* Shutdown all connections of all backup servers of a proxy. The caller must
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* pass a termination code in <why>, which must be one of SF_ERR_* indicating
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* the reason for the shutdown.
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*/
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void srv_shutdown_backup_streams(struct proxy *px, int why);
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void srv_append_status(struct chunk *msg, struct server *s, struct check *, int xferred, int forced);
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void srv_set_stopped(struct server *s, const char *reason, struct check *check);
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void srv_set_running(struct server *s, const char *reason, struct check *check);
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void srv_set_stopping(struct server *s, const char *reason, struct check *check);
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/* Enables admin flag <mode> (among SRV_ADMF_*) on server <s>. This is used to
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* enforce either maint mode or drain mode. It is not allowed to set more than
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* one flag at once. The equivalent "inherited" flag is propagated to all
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* tracking servers. Maintenance mode disables health checks (but not agent
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* checks). When either the flag is already set or no flag is passed, nothing
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* is done. If <cause> is non-null, it will be displayed at the end of the log
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* lines to justify the state change.
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*/
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void srv_set_admin_flag(struct server *s, enum srv_admin mode, const char *cause);
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/* Disables admin flag <mode> (among SRV_ADMF_*) on server <s>. This is used to
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* stop enforcing either maint mode or drain mode. It is not allowed to set more
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* than one flag at once. The equivalent "inherited" flag is propagated to all
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* tracking servers. Leaving maintenance mode re-enables health checks. When
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* either the flag is already cleared or no flag is passed, nothing is done.
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*/
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void srv_clr_admin_flag(struct server *s, enum srv_admin mode);
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/* Calculates the dynamic persitent cookie for a server, if a secret key has
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* been provided.
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*/
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void srv_set_dyncookie(struct server *s);
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/* Puts server <s> into maintenance mode, and propagate that status down to all
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* tracking servers.
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*/
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static inline void srv_adm_set_maint(struct server *s)
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{
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srv_set_admin_flag(s, SRV_ADMF_FMAINT, NULL);
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srv_clr_admin_flag(s, SRV_ADMF_FDRAIN);
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}
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/* Puts server <s> into drain mode, and propagate that status down to all
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* tracking servers.
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*/
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static inline void srv_adm_set_drain(struct server *s)
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{
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srv_set_admin_flag(s, SRV_ADMF_FDRAIN, NULL);
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srv_clr_admin_flag(s, SRV_ADMF_FMAINT);
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}
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/* Puts server <s> into ready mode, and propagate that status down to all
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* tracking servers.
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*/
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static inline void srv_adm_set_ready(struct server *s)
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{
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srv_clr_admin_flag(s, SRV_ADMF_FDRAIN);
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srv_clr_admin_flag(s, SRV_ADMF_FMAINT);
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}
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/* appends an initaddr method to the existing list. Returns 0 on failure. */
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static inline int srv_append_initaddr(unsigned int *list, enum srv_initaddr addr)
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{
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int shift = 0;
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while (shift + 3 < 32 && (*list >> shift))
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shift += 3;
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if (shift + 3 > 32)
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return 0;
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*list |= addr << shift;
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return 1;
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}
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/* returns the next initaddr method and removes it from <list> by shifting
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* it right (implying that it MUST NOT be the server's. Returns SRV_IADDR_END
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* at the end.
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*/
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static inline enum srv_initaddr srv_get_next_initaddr(unsigned int *list)
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{
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enum srv_initaddr ret;
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ret = *list & 7;
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*list >>= 3;
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return ret;
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}
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#endif /* _PROTO_SERVER_H */
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/*
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* Local variables:
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* c-indent-level: 8
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* c-basic-offset: 8
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* End:
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*/
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