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fis-gtm/sr_unix/recvpool_init.c

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/****************************************************************
* *
* Copyright 2001, 2012 Fidelity Information Services, Inc *
* *
* This source code contains the intellectual property *
* of its copyright holder(s), and is made available *
* under a license. If you do not know the terms of *
* the license, please stop and do not read further. *
* *
****************************************************************/
#include "mdef.h"
#include "gtm_ipc.h"
#include <sys/shm.h>
#include <sys/sem.h>
#include <errno.h>
#include "gtm_fcntl.h"
#include "gtm_unistd.h"
#include "gtm_inet.h"
#include "gtm_string.h"
#include <stddef.h>
#include "gdsroot.h"
#include "gdsblk.h"
#include "gtm_facility.h"
#include "fileinfo.h"
#include "gdsbt.h"
#include "gdsfhead.h"
#include "filestruct.h"
#include "iosp.h"
#include "gtmrecv.h"
#include "gtm_logicals.h"
#include "jnl.h"
#include "repl_sem.h"
#include "repl_shutdcode.h"
#include "io.h"
#include "do_shmat.h"
#include "trans_log_name.h"
#include "mu_gv_cur_reg_init.h"
#include "gtmmsg.h"
#include "gtm_sem.h"
#include "ipcrmid.h"
#include "ftok_sems.h"
#include "interlock.h"
#include "repl_msg.h"
#include "gtmsource.h"
#include "repl_instance.h"
GBLREF jnlpool_addrs jnlpool;
GBLREF recvpool_addrs recvpool;
GBLREF int recvpool_shmid;
GBLREF uint4 process_id;
GBLREF gtmrecv_options_t gtmrecv_options;
GBLREF gd_region *gv_cur_region;
GBLREF repl_conn_info_t *this_side, *remote_side;
GBLREF int4 strm_index;
LITREF char gtm_release_name[];
LITREF int4 gtm_release_name_len;
error_def(ERR_NORECVPOOL);
error_def(ERR_RECVPOOLSETUP);
error_def(ERR_TEXT);
#define MAX_RES_TRIES 620 /* Also defined in gvcst_init_sysops.c */
#define REMOVE_OR_RELEASE_SEM(NEW_IPC, UDI) \
{ \
if (NEW_IPC) \
remove_sem_set(RECV); \
else \
rel_sem_immediate(RECV, RECV_POOL_ACCESS_SEM); \
}
void recvpool_init(recvpool_user pool_user, boolean_t gtmrecv_startup)
{
boolean_t shm_created, new_ipc = FALSE;
char instfilename[MAX_FN_LEN + 1];
char machine_name[MAX_MCNAMELEN];
gd_region *r_save, *reg;
int status, save_errno;
union semun semarg;
struct semid_ds semstat;
struct shmid_ds shmstat;
repl_inst_hdr repl_instance;
sm_long_t status_l;
unix_db_info *udi;
unsigned int full_len;
sgmnt_addrs *repl_csa;
DEBUG_ONLY(int4 semval;)
memset(machine_name, 0, SIZEOF(machine_name));
if (GETHOSTNAME(machine_name, MAX_MCNAMELEN, status))
rts_error(VARLSTCNT(5) ERR_TEXT, 2, RTS_ERROR_TEXT("Unable to get the hostname"), errno);
if (NULL == jnlpool.jnlpool_dummy_reg)
{
r_save = gv_cur_region;
mu_gv_cur_reg_init();
reg = recvpool.recvpool_dummy_reg = gv_cur_region;
gv_cur_region = r_save;
assert(!gtmrecv_options.start); /* Should not be receiver server startup as that would have attached to jnl pool */
} else
{ /* Have already attached to the journal pool. Use the journal pool region for the receive pool as well as they
* both correspond to one and the same file (replication instance file). We need to do this to ensure that an
* "ftok_sem_get" done with either "jnlpool.jnlpool_dummy_reg" region or "recvpool.recvpool_dummy_reg" region
* locks the same entity.
* Should have already attached to journal pool only for receiver server startup or shutdown. Assert that.
*/
assert(gtmrecv_options.start || gtmrecv_options.shut_down);
reg = recvpool.recvpool_dummy_reg = jnlpool.jnlpool_dummy_reg;
}
udi = FILE_INFO(reg);
if (!repl_inst_get_name(instfilename, &full_len, MAX_FN_LEN + 1, issue_rts_error))
GTMASSERT; /* rts_error should have been issued by repl_inst_get_name */
assert((recvpool.recvpool_dummy_reg != jnlpool.jnlpool_dummy_reg)
|| (reg->dyn.addr->fname_len == full_len) && !STRCMP(reg->dyn.addr->fname, instfilename));
if (recvpool.recvpool_dummy_reg != jnlpool.jnlpool_dummy_reg)
{ /* Fill in fields only if this is the first time this process is opening the replication instance file */
memcpy((char *)reg->dyn.addr->fname, instfilename, full_len);
reg->dyn.addr->fname_len = full_len;
udi->fn = (char *)reg->dyn.addr->fname;
}
/* First grab ftok semaphore for replication instance file. Once we have it locked, no one else can start up
* or, shut down replication for this instance. We will release ftok semaphore when initialization is done.
*/
if (!ftok_sem_get(recvpool.recvpool_dummy_reg, TRUE, REPLPOOL_ID, FALSE))
rts_error(VARLSTCNT(1) ERR_RECVPOOLSETUP);
repl_inst_read(instfilename, (off_t)0, (sm_uc_ptr_t)&repl_instance, SIZEOF(repl_inst_hdr));
if (INVALID_SEMID == repl_instance.recvpool_semid)
{
if (INVALID_SHMID != repl_instance.recvpool_shmid)
GTMASSERT;
if (GTMRECV != pool_user || !gtmrecv_startup)
{
ftok_sem_release(recvpool.recvpool_dummy_reg, TRUE, TRUE);
rts_error(VARLSTCNT(4) ERR_NORECVPOOL, 2, full_len, udi->fn);
}
new_ipc = TRUE;
assert(NUM_SRC_SEMS == NUM_RECV_SEMS);
if (INVALID_SEMID == (udi->semid = init_sem_set_recvr(IPC_PRIVATE, NUM_RECV_SEMS, RWDALL | IPC_CREAT)))
{
ftok_sem_release(recvpool.recvpool_dummy_reg, TRUE, TRUE);
rts_error(VARLSTCNT(7) ERR_RECVPOOLSETUP, 0,
ERR_TEXT, 2,
RTS_ERROR_LITERAL("Error creating recv pool"), REPL_SEM_ERRNO);
}
/* Following will set semaphore RECV_ID_SEM value as GTM_ID. In case we have orphaned semaphore for some reason,
* mupip rundown will be able to identify GTM semaphores checking the value and can remove.
*/
semarg.val = GTM_ID;
if (-1 == semctl(udi->semid, RECV_ID_SEM, SETVAL, semarg))
{
save_errno = errno;
remove_sem_set(RECV); /* Remove what we created */
ftok_sem_release(recvpool.recvpool_dummy_reg, TRUE, TRUE);
rts_error(VARLSTCNT(7) ERR_RECVPOOLSETUP, 0, ERR_TEXT, 2,
RTS_ERROR_LITERAL("Error with recvpool semctl"), save_errno);
}
/* Warning: We must read the sem_ctime using IPC_STAT after SETVAL, which changes it. We must NOT do any more
* SETVAL after this. Our design is to use sem_ctime as creation time of semaphore.
*/
semarg.buf = &semstat;
if (-1 == semctl(udi->semid, RECV_ID_SEM, IPC_STAT, semarg))
{
save_errno = errno;
remove_sem_set(RECV); /* Remove what we created */
ftok_sem_release(recvpool.recvpool_dummy_reg, TRUE, TRUE);
rts_error(VARLSTCNT(7) ERR_RECVPOOLSETUP, 0, ERR_TEXT, 2,
RTS_ERROR_LITERAL("Error with recvpool semctl"), save_errno);
}
udi->gt_sem_ctime = semarg.buf->sem_ctime;
} else
{ /* find create time of semaphore from the file header and check if the id is reused by others */
semarg.buf = &semstat;
if (-1 == semctl(repl_instance.recvpool_semid, 0, IPC_STAT, semarg))
{
save_errno = errno;
ftok_sem_release(recvpool.recvpool_dummy_reg, TRUE, TRUE);
rts_error(VARLSTCNT(5) ERR_REPLREQROLLBACK, 2, full_len, udi->fn, save_errno);
}
else if (semarg.buf->sem_ctime != repl_instance.recvpool_semid_ctime)
{
ftok_sem_release(recvpool.recvpool_dummy_reg, TRUE, TRUE);
rts_error(VARLSTCNT(8) ERR_REPLREQROLLBACK, 2, full_len, udi->fn,
ERR_TEXT, 2, RTS_ERROR_TEXT("recvpool sem_ctime does not match"));
}
udi->semid = repl_instance.recvpool_semid;
udi->gt_sem_ctime = repl_instance.recvpool_semid_ctime;
set_sem_set_recvr(udi->semid); /* repl_sem.c has some functions which needs some static variable to have the id */
}
assert((INVALID_SEMID != udi->shmid) && (0 != udi->gt_sem_ctime));
assert(!udi->grabbed_access_sem);
status = grab_sem(RECV, RECV_POOL_ACCESS_SEM);
if (SS_NORMAL != status)
{
ftok_sem_release(recvpool.recvpool_dummy_reg, TRUE, TRUE);
rts_error(VARLSTCNT(7) ERR_RECVPOOLSETUP, 0, ERR_TEXT, 2,
RTS_ERROR_LITERAL("Error with receive pool semaphores"), REPL_SEM_ERRNO);
}
udi->grabbed_access_sem = TRUE;
if (INVALID_SHMID == repl_instance.recvpool_shmid)
{ /* We have an INVALID shmid in the file header. There are three ways this can happen
*
* 1. A rollback started off with either no receive pool or rundown'd an existing receive pool and created new
* semaphores, but got killed in the middle. At this point, if a new receiver server starts up, it will notice
* a valid usable semid, but will find an invalid shmid.
*
* 2. A rollback started off with either no journal pool or rundown'd an existing journal pool and created new
* semaphores. Before it goes to mur_close_files, lets say a receiver server started. It will acquire the ftok
* semaphore, but will be waiting for the access control semaphore which rollback is holding. Rollback, on the
* other hand, will see if the ftok semaphore is available BEFORE removing the semaphores from the system. But,
* since receiver server is holding the ftok, Rollback, will not remove the access control semaphore. But, would
* just let go of them and exit (repl_instance.file_corrupt can be either TRUE or FALSE depending on whether
* Rollback completed successfully or not).
*
* 3. A fresh startup.
*
* For all the cases, we need to check if repl_instance.file_corrupt is TRUE. If so, we should issue an error. But,
* the check is NOT needed here, because jnlpool_init already checks that condition and does an rts_error. So, we
* should have never come here. Assert that. If file_corrupt is FALSE and this is the receiver server startup
* command, create the receive pool anyways.
*/
assert(!repl_instance.file_corrupt);
/* Ensure that NO one has yet incremented the RECV_SERV_COUNT_SEM (as implied by all the 3 cases above) */
assert(0 == (semval = semctl(udi->semid, RECV_SERV_COUNT_SEM, GETVAL))); /* semval = number of processes attached */
new_ipc = TRUE; /* need to create a new IPC */
} else if (-1 == shmctl(repl_instance.recvpool_shmid, IPC_STAT, &shmstat))
{ /* shared memory ID was removed form the system by an IPCRM command or we have a permission issue (or such) */
save_errno = errno;
REMOVE_OR_RELEASE_SEM(new_ipc, udi);
ftok_sem_release(recvpool.recvpool_dummy_reg, TRUE, TRUE);
rts_error(VARLSTCNT(5) ERR_REPLREQROLLBACK, 2, full_len, udi->fn, save_errno);
} else if (shmstat.shm_ctime != repl_instance.recvpool_shmid_ctime)
{ /* shared memory was possibly reused (causing shm_ctime and jnlpool_shmid_ctime to be different. We can't rely
* on the shmid as it could be connected to a valid instance file in a different environment. Create new IPCs
*/
new_ipc = TRUE; /* need to create a new IPC */
} else
{
recvpool_shmid = udi->shmid = repl_instance.recvpool_shmid;
udi->gt_shm_ctime = repl_instance.recvpool_shmid_ctime;
}
if (new_ipc && (GTMRECV != pool_user || !gtmrecv_startup))
{
REMOVE_OR_RELEASE_SEM(new_ipc, udi);
ftok_sem_release(recvpool.recvpool_dummy_reg, TRUE, TRUE);
rts_error(VARLSTCNT(4) ERR_NORECVPOOL, 2, full_len, udi->fn);
}
shm_created = FALSE;
if (new_ipc)
{ /* create new shared memory */
if (-1 == (udi->shmid = recvpool_shmid = shmget(IPC_PRIVATE, gtmrecv_options.buffsize, IPC_CREAT | RWDALL)))
{
udi->shmid = recvpool_shmid = INVALID_SHMID;
save_errno = errno;
remove_sem_set(RECV); /* Remove what we created */
ftok_sem_release(recvpool.recvpool_dummy_reg, TRUE, TRUE);
rts_error(VARLSTCNT(7) ERR_RECVPOOLSETUP, 0, ERR_TEXT, 2,
RTS_ERROR_LITERAL("Error with receive pool creation"), save_errno);
}
if (-1 == shmctl(udi->shmid, IPC_STAT, &shmstat))
{
save_errno = errno;
if (0 != shm_rmid(udi->shmid))
gtm_putmsg(VARLSTCNT(7) ERR_RECVPOOLSETUP, 0, ERR_TEXT, 2,
RTS_ERROR_LITERAL("Error removing recvpool "), errno);
remove_sem_set(RECV); /* Remove what we created */
ftok_sem_release(recvpool.recvpool_dummy_reg, TRUE, TRUE);
rts_error(VARLSTCNT(7) ERR_RECVPOOLSETUP, 0, ERR_TEXT, 2,
RTS_ERROR_LITERAL("Error with recvpool shmctl"), save_errno);
}
udi->gt_shm_ctime = shmstat.shm_ctime;
shm_created = TRUE;
}
assert((INVALID_SHMID != udi->shmid) && (0 != udi->gt_shm_ctime) && (0 != recvpool_shmid));
status_l = (sm_long_t)(recvpool.recvpool_ctl = (recvpool_ctl_ptr_t)do_shmat(recvpool_shmid, 0, 0));
if (-1 == status_l)
{
save_errno = errno;
if (new_ipc)
remove_sem_set(RECV);
else
rel_sem_immediate(RECV, RECV_POOL_ACCESS_SEM);
udi->grabbed_access_sem = FALSE;
ftok_sem_release(recvpool.recvpool_dummy_reg, TRUE, TRUE);
rts_error(VARLSTCNT(7) ERR_RECVPOOLSETUP, 0, ERR_TEXT, 2,
RTS_ERROR_LITERAL("Error with receive pool shmat"), save_errno);
}
if (shm_created)
recvpool.recvpool_ctl->initialized = FALSE;
recvpool.upd_proc_local = (upd_proc_local_ptr_t)((sm_uc_ptr_t)recvpool.recvpool_ctl + RECVPOOL_CTL_SIZE);
recvpool.gtmrecv_local = (gtmrecv_local_ptr_t)((sm_uc_ptr_t)recvpool.upd_proc_local + UPD_PROC_LOCAL_SIZE);
recvpool.upd_helper_ctl = (upd_helper_ctl_ptr_t)((sm_uc_ptr_t)recvpool.gtmrecv_local + GTMRECV_LOCAL_SIZE);
recvpool.recvdata_base = (sm_uc_ptr_t)recvpool.recvpool_ctl + RECVDATA_BASE_OFF;
if (GTMRECV == pool_user && gtmrecv_startup)
recvpool.recvpool_ctl->fresh_start = FALSE;
this_side = &recvpool.recvpool_ctl->this_side;
remote_side = &recvpool.gtmrecv_local->remote_side; /* Set global variable now. Structure will be initialized
* later when receiver server connects to a source server */
if (!recvpool.recvpool_ctl->initialized)
{
if (GTMRECV != pool_user || !gtmrecv_startup)
{
if (new_ipc)
remove_sem_set(RECV);
else
rel_sem_immediate(RECV, RECV_POOL_ACCESS_SEM);
udi->grabbed_access_sem = FALSE;
ftok_sem_release(recvpool.recvpool_dummy_reg, TRUE, TRUE);
rts_error(VARLSTCNT(6) ERR_RECVPOOLSETUP, 0, ERR_TEXT, 2,
RTS_ERROR_LITERAL("Receive pool has not been initialized"));
}
/* Initialize the shared memory fields */
recvpool.recvpool_ctl->jnl_seqno = 0;
recvpool.recvpool_ctl->recvdata_base_off = RECVDATA_BASE_OFF;
recvpool.recvpool_ctl->recvpool_size = gtmrecv_options.buffsize - recvpool.recvpool_ctl->recvdata_base_off;
recvpool.recvpool_ctl->write = 0;
recvpool.recvpool_ctl->write_wrap = recvpool.recvpool_ctl->recvpool_size;
recvpool.recvpool_ctl->wrapped = FALSE;
memcpy( (char *)recvpool.recvpool_ctl->recvpool_id.instfilename, instfilename, full_len);
memcpy(recvpool.recvpool_ctl->recvpool_id.label, GDS_RPL_LABEL, GDS_LABEL_SZ);
memcpy(recvpool.recvpool_ctl->recvpool_id.now_running, gtm_release_name, gtm_release_name_len + 1);
assert(0 == offsetof(recvpool_ctl_struct, recvpool_id));
/* ensure that the pool identifier is at the top of the pool */
recvpool.recvpool_ctl->recvpool_id.pool_type = RECVPOOL_SEGMENT;
GTMRECV_CLEAR_CACHED_HISTINFO(recvpool.recvpool_ctl, jnlpool, jnlpool.jnlpool_ctl, INSERT_STRM_HISTINFO_TRUE);
this_side = &recvpool.recvpool_ctl->this_side;
this_side->proto_ver = REPL_PROTO_VER_THIS;
this_side->jnl_ver = JNL_VER_THIS;
/* this_side->is_std_null_coll = will be initialized by update process since receiver does not have access to db */
this_side->trigger_supported = GTMTRIG_ONLY(TRUE) NON_GTMTRIG_ONLY(FALSE);
/* The following 3 members make sense only if the other side of a replication connection is also known. Since
* this_side talks about the properties of this instance, these 3 dont make sense in this context. When a connection
* to the other side is made, each rcvr server's gtmrecv_local->remote_side will have these fields appropriately set
*/
this_side->cross_endian = FALSE;
this_side->endianness_known = FALSE;
this_side->null_subs_xform = FALSE;
this_side->is_supplementary = repl_instance.is_supplementary;
recvpool.upd_proc_local->upd_proc_shutdown = NO_SHUTDOWN;
recvpool.upd_proc_local->upd_proc_shutdown_time = -1;
recvpool.upd_proc_local->upd_proc_pid = 0;
recvpool.upd_proc_local->upd_proc_pid_prev = 0;
recvpool.upd_proc_local->read_jnl_seqno = 0;
recvpool.upd_proc_local->read = 0;
recvpool.gtmrecv_local->recv_serv_pid = process_id;
assert(NULL != jnlpool.jnlpool_ctl);
if (NULL != jnlpool.jnlpool_ctl)
jnlpool.jnlpool_ctl->gtmrecv_pid = process_id;
recvpool.gtmrecv_local->lastrecvd_time = -1;
recvpool.gtmrecv_local->restart = GTMRECV_NO_RESTART;
recvpool.gtmrecv_local->statslog = FALSE;
recvpool.gtmrecv_local->shutdown = NO_SHUTDOWN;
recvpool.gtmrecv_local->shutdown_time = -1;
STRCPY(recvpool.gtmrecv_local->filter_cmd, gtmrecv_options.filter_cmd);
recvpool.gtmrecv_local->statslog_file[0] = '\0';
/* recvpool.gtmrecv_local->remote_side will be initialized at connection establishment time */
assert(NULL != jnlpool.repl_inst_filehdr);
recvpool.gtmrecv_local->strm_index = strm_index;
/* The following fields will be initialized in gtmrecv.c
* recvpool.gtmrecv_local->updateresync
* recvpool.gtmrecv_local->updresync_instfile_fd
* recvpool.gtmrecv_local->updresync_lms_group
* recvpool.gtmrecv_local->updresync_jnl_seqno
* recvpool.gtmrecv_local->updresync_num_histinfo
*/
memset(recvpool.upd_helper_ctl, 0, SIZEOF(*recvpool.upd_helper_ctl));
SET_LATCH_GLOBAL(&recvpool.upd_helper_ctl->pre_read_lock, LOCK_AVAILABLE);
recvpool.recvpool_ctl->initialized = TRUE;
recvpool.recvpool_ctl->fresh_start = TRUE;
}
if (new_ipc)
{ /* Flush shmid/semid changes to the instance file header if this process created the receive pool.
* Also update the instance file header section in the journal pool with the recvpool sem/shm ids.
* Before updating jnlpool fields, ensure the journal pool lock is grabbed.
*/
assert(NULL != jnlpool.repl_inst_filehdr);
DEBUG_ONLY(repl_csa = &FILE_INFO(jnlpool.jnlpool_dummy_reg)->s_addrs;)
assert(!repl_csa->hold_onto_crit); /* so it is ok to invoke "grab_lock" and "rel_lock" unconditionally */
GRAB_LOCK(jnlpool.jnlpool_dummy_reg, ASSERT_NO_ONLINE_ROLLBACK);
jnlpool.repl_inst_filehdr->recvpool_shmid = udi->shmid;
jnlpool.repl_inst_filehdr->recvpool_semid = udi->semid;
jnlpool.repl_inst_filehdr->recvpool_shmid_ctime = udi->gt_shm_ctime;
jnlpool.repl_inst_filehdr->recvpool_semid_ctime = udi->gt_sem_ctime;
/* Flush the file header to disk so future callers of "jnlpool_init" see the jnlpool_semid and jnlpool_shmid */
repl_inst_flush_filehdr();
rel_lock(jnlpool.jnlpool_dummy_reg);
}
/* Release control lockout and ftok semaphore now that the receive pool has been attached.
* The only exception is receiver server shutdown command. In this case, all these locks will be released
* once the receiver server shutdown is actually complete. Note that if -UPDATEONLY or -HELPERS is specified
* in the shutdown, we do not want to hold any of these locks.
*/
if ((GTMRECV != pool_user) || !gtmrecv_options.shut_down || gtmrecv_options.updateonly || gtmrecv_options.helpers)
{
rel_sem(RECV, RECV_POOL_ACCESS_SEM);
udi->grabbed_access_sem = FALSE;
if (!ftok_sem_release(recvpool.recvpool_dummy_reg, FALSE, FALSE))
rts_error(VARLSTCNT(1) ERR_RECVPOOLSETUP);
}
/* If receiver server startup, grab the options semaphore to lock out checkhealth, statslog or changelog.
* Ideally one should grab this before releasing the ftok and access semaphore but the issue with this is that
* if we do, we can cause a deadlock. Hence we do this just after releasing the ftok and access semaphore. This
* introduces a small window of instructions where a checkhealth, changelog, statslog etc. can sneak in right
* after we release the ftok and access lock but before we grab the options semaphore and attach to a receive pool
* that is uninitialized. This will be addressed by C9F12-002766.
*/
if ((GTMRECV == pool_user) && gtmrecv_options.start && (0 != grab_sem(RECV, RECV_SERV_OPTIONS_SEM)))
{
save_errno = REPL_SEM_ERRNO;
if (new_ipc)
remove_sem_set(RECV);
else
rel_sem_immediate(RECV, RECV_POOL_ACCESS_SEM);
udi->grabbed_access_sem = FALSE;
ftok_sem_release(recvpool.recvpool_dummy_reg, TRUE, TRUE);
rts_error(VARLSTCNT(7) ERR_RECVPOOLSETUP, 0, ERR_TEXT, 2,
RTS_ERROR_LITERAL("Error with receive pool options semaphore"), save_errno);
}
return;
}
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