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lvm2/daemons/lvmpolld/lvmpolld-core.c
Zdenek Kabelac ac6b355978 cleanup: drop double const 
Second const is unneeded.
Also always create whole array with MAX elements.
2015-06-15 14:46:44 +02:00

985 lines
26 KiB
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/*
* Copyright (C) 2014-2015 Red Hat, Inc.
*
* This file is part of LVM2.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License v.2.1.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "lvmpolld-common.h"
#include "lvm-version.h"
#include "daemon-server.h"
#include "daemon-log.h"
#include <getopt.h>
#include <poll.h>
#include <wait.h>
#define LVMPOLLD_SOCKET DEFAULT_RUN_DIR "/lvmpolld.socket"
#define PD_LOG_PREFIX "LVMPOLLD"
#define LVM2_LOG_PREFIX "\tLVPOLL"
/* predefined reason for response = "failed" case */
#define REASON_REQ_NOT_IMPLEMENTED "request not implemented"
#define REASON_MISSING_LVID "request requires lvid set"
#define REASON_MISSING_LVNAME "request requires lvname set"
#define REASON_MISSING_VGNAME "request requires vgname set"
#define REASON_POLLING_FAILED "polling of lvm command failed"
#define REASON_ILLEGAL_ABORT_REQUEST "abort only supported with PVMOVE polling operation"
#define REASON_DIFFERENT_OPERATION_IN_PROGRESS "Different operation on LV already in progress"
#define REASON_INVALID_INTERVAL "request requires interval set"
#define REASON_ENOMEM "not enough memory"
struct lvmpolld_state {
daemon_idle *idle;
log_state *log;
const char *log_config;
const char *lvm_binary;
struct lvmpolld_store *id_to_pdlv_abort;
struct lvmpolld_store *id_to_pdlv_poll;
};
static pthread_key_t key;
static const char *_strerror_r(int errnum, struct lvmpolld_thread_data *data)
{
#ifdef _GNU_SOURCE
return strerror_r(errnum, data->buf, sizeof(data->buf)); /* never returns NULL */
#elif (_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600)
return strerror_r(errnum, data->buf, sizeof(data->buf)) ? "" : data->buf;
#else
# warning "Can't decide proper strerror_r implementation. lvmpolld will not issue specific system error messages"
return "";
#endif
}
static void _usage(const char *prog, FILE *file)
{
fprintf(file, "Usage:\n"
"%s [-V] [-h] [-f] [-l {all|wire|debug}] [-s path] [-B path] [-p path] [-t secs]\n"
"%s --dump [-s path]\n"
" -V|--version Show version info\n"
" -h|--help Show this help information\n"
" -f|--foreground Don't fork, run in the foreground\n"
" --dump Dump full lvmpolld state\n"
" -l|--log Logging message level (-l {all|wire|debug})\n"
" -p|--pidfile Set path to the pidfile\n"
" -s|--socket Set path to the communication socket\n"
" -B|--binary Path to lvm2 binary\n"
" -t|--timeout Time to wait in seconds before shutdown on idle (missing or 0 = inifinite)\n\n", prog, prog);
}
static int _init(struct daemon_state *s)
{
struct lvmpolld_state *ls = s->private;
ls->log = s->log;
if (!daemon_log_parse(ls->log, DAEMON_LOG_OUTLET_STDERR, ls->log_config, 1))
return 0;
if (pthread_key_create(&key, lvmpolld_thread_data_destroy)) {
FATAL(ls, "%s: %s", PD_LOG_PREFIX, "Failed to create pthread key");
return 0;
}
ls->id_to_pdlv_poll = pdst_init("polling");
ls->id_to_pdlv_abort = pdst_init("abort");
if (!ls->id_to_pdlv_poll || !ls->id_to_pdlv_abort) {
FATAL(ls, "%s: %s", PD_LOG_PREFIX, "Failed to allocate internal data structures");
return 0;
}
ls->lvm_binary = ls->lvm_binary ?: LVM_PATH;
if (access(ls->lvm_binary, X_OK)) {
FATAL(ls, "%s: %s %s", PD_LOG_PREFIX, "Execute access rights denied on", ls->lvm_binary);
return 0;
}
if (ls->idle)
ls->idle->is_idle = 1;
return 1;
}
static void _lvmpolld_stores_lock(struct lvmpolld_state *ls)
{
pdst_lock(ls->id_to_pdlv_poll);
pdst_lock(ls->id_to_pdlv_abort);
}
static void _lvmpolld_stores_unlock(struct lvmpolld_state *ls)
{
pdst_unlock(ls->id_to_pdlv_abort);
pdst_unlock(ls->id_to_pdlv_poll);
}
static void _lvmpolld_global_lock(struct lvmpolld_state *ls)
{
_lvmpolld_stores_lock(ls);
pdst_locked_lock_all_pdlvs(ls->id_to_pdlv_poll);
pdst_locked_lock_all_pdlvs(ls->id_to_pdlv_abort);
}
static void _lvmpolld_global_unlock(struct lvmpolld_state *ls)
{
pdst_locked_unlock_all_pdlvs(ls->id_to_pdlv_abort);
pdst_locked_unlock_all_pdlvs(ls->id_to_pdlv_poll);
_lvmpolld_stores_unlock(ls);
}
static int _fini(struct daemon_state *s)
{
int done;
const struct timespec t = { .tv_nsec = 250000000 }; /* .25 sec */
struct lvmpolld_state *ls = s->private;
DEBUGLOG(s, "fini");
DEBUGLOG(s, "sending cancel requests");
_lvmpolld_global_lock(ls);
pdst_locked_send_cancel(ls->id_to_pdlv_poll);
pdst_locked_send_cancel(ls->id_to_pdlv_abort);
_lvmpolld_global_unlock(ls);
DEBUGLOG(s, "waiting for background threads to finish");
while(1) {
_lvmpolld_stores_lock(ls);
done = !pdst_locked_get_active_count(ls->id_to_pdlv_poll) &&
!pdst_locked_get_active_count(ls->id_to_pdlv_abort);
_lvmpolld_stores_unlock(ls);
if (done)
break;
nanosleep(&t, NULL);
}
DEBUGLOG(s, "destroying internal data structures");
_lvmpolld_stores_lock(ls);
pdst_locked_destroy_all_pdlvs(ls->id_to_pdlv_poll);
pdst_locked_destroy_all_pdlvs(ls->id_to_pdlv_abort);
_lvmpolld_stores_unlock(ls);
pdst_destroy(ls->id_to_pdlv_poll);
pdst_destroy(ls->id_to_pdlv_abort);
pthread_key_delete(key);
return 1;
}
static response reply(const char *res, const char *reason)
{
return daemon_reply_simple(res, "reason = %s", reason, NULL);
}
static int read_single_line(struct lvmpolld_thread_data *data, int err)
{
ssize_t r = getline(&data->line, &data->line_size, err ? data->ferr : data->fout);
if (r > 0 && *(data->line + r - 1) == '\n')
*(data->line + r - 1) = '\0';
return (r > 0);
}
static void update_idle_state(struct lvmpolld_state *ls)
{
if (!ls->idle)
return;
_lvmpolld_stores_lock(ls);
ls->idle->is_idle = !pdst_locked_get_active_count(ls->id_to_pdlv_poll) &&
!pdst_locked_get_active_count(ls->id_to_pdlv_abort);
_lvmpolld_stores_unlock(ls);
DEBUGLOG(ls, "%s: %s %s%s", PD_LOG_PREFIX, "daemon is", ls->idle->is_idle ? "" : "not ", "idle");
}
/* make this configurable */
#define MAX_TIMEOUT 2
static int poll_for_output(struct lvmpolld_lv *pdlv, struct lvmpolld_thread_data *data)
{
int ch_stat, r, err = 1, fds_count = 2, timeout = 0;
pid_t pid;
struct lvmpolld_cmd_stat cmd_state = { .retcode = -1, .signal = 0 };
struct pollfd fds[] = { { .fd = data->outpipe[0], .events = POLLIN },
{ .fd = data->errpipe[0], .events = POLLIN } };
if (!(data->fout = fdopen(data->outpipe[0], "r")) || !(data->ferr = fdopen(data->errpipe[0], "r"))) {
ERROR(pdlv->ls, "%s: %s: (%d) %s", PD_LOG_PREFIX, "failed to open file stream",
errno, _strerror_r(errno, data));
goto out;
}
while (1) {
do {
r = poll(fds, 2, pdlv_get_timeout(pdlv) * 1000);
} while (r < 0 && errno == EINTR);
DEBUGLOG(pdlv->ls, "%s: %s %d", PD_LOG_PREFIX, "poll() returned", r);
if (r < 0) {
ERROR(pdlv->ls, "%s: %s (PID %d) failed: (%d) %s",
PD_LOG_PREFIX, "poll() for LVM2 cmd", pdlv->cmd_pid,
errno, _strerror_r(errno, data));
goto out;
} else if (!r) {
timeout++;
WARN(pdlv->ls, "%s: %s (PID %d) %s", PD_LOG_PREFIX,
"polling for output of the lvm cmd", pdlv->cmd_pid,
"has timed out");
if (timeout > MAX_TIMEOUT) {
ERROR(pdlv->ls, "%s: %s (PID %d) (no output for %d seconds)",
PD_LOG_PREFIX,
"LVM2 cmd is unresponsive too long",
pdlv->cmd_pid,
timeout * pdlv_get_timeout(pdlv));
goto out;
}
continue; /* while(1) */
}
timeout = 0;
/* handle the command's STDOUT */
if (fds[0].revents & POLLIN) {
DEBUGLOG(pdlv->ls, "%s: %s", PD_LOG_PREFIX, "caught input data in STDOUT");
assert(read_single_line(data, 0)); /* may block indef. anyway */
INFO(pdlv->ls, "%s: PID %d: %s: '%s'", LVM2_LOG_PREFIX,
pdlv->cmd_pid, "STDOUT", data->line);
} else if (fds[0].revents) {
if (fds[0].revents & POLLHUP)
DEBUGLOG(pdlv->ls, "%s: %s", PD_LOG_PREFIX, "caught POLLHUP");
else
WARN(pdlv->ls, "%s: %s", PD_LOG_PREFIX, "poll for command's STDOUT failed");
fds[0].fd = -1;
fds_count--;
}
/* handle the command's STDERR */
if (fds[1].revents & POLLIN) {
DEBUGLOG(pdlv->ls, "%s: %s", PD_LOG_PREFIX,
"caught input data in STDERR");
assert(read_single_line(data, 1)); /* may block indef. anyway */
INFO(pdlv->ls, "%s: PID %d: %s: '%s'", LVM2_LOG_PREFIX,
pdlv->cmd_pid, "STDERR", data->line);
} else if (fds[1].revents) {
if (fds[1].revents & POLLHUP)
DEBUGLOG(pdlv->ls, "%s: %s", PD_LOG_PREFIX, "caught err POLLHUP");
else
WARN(pdlv->ls, "%s: %s", PD_LOG_PREFIX, "poll for command's STDOUT failed");
fds[1].fd = -1;
fds_count--;
}
do {
/*
* fds_count == 0 means polling reached EOF
* or received error on both descriptors.
* In such case, just wait for command to finish
*/
pid = waitpid(pdlv->cmd_pid, &ch_stat, fds_count ? WNOHANG : 0);
} while (pid < 0 && errno == EINTR);
if (pid) {
if (pid < 0) {
ERROR(pdlv->ls, "%s: %s (PID %d) failed: (%d) %s",
PD_LOG_PREFIX, "waitpid() for lvm2 cmd",
pdlv->cmd_pid, errno,
_strerror_r(errno, data));
goto out;
}
DEBUGLOG(pdlv->ls, "%s: %s", PD_LOG_PREFIX, "child exited");
break;
}
} /* while(1) */
DEBUGLOG(pdlv->ls, "%s: %s", PD_LOG_PREFIX, "about to collect remaining lines");
if (fds[0].fd >= 0)
while (read_single_line(data, 0)) {
assert(r > 0);
INFO(pdlv->ls, "%s: PID %d: %s: %s", LVM2_LOG_PREFIX, pdlv->cmd_pid, "STDOUT", data->line);
}
if (fds[1].fd >= 0)
while (read_single_line(data, 1)) {
assert(r > 0);
INFO(pdlv->ls, "%s: PID %d: %s: %s", LVM2_LOG_PREFIX, pdlv->cmd_pid, "STDERR", data->line);
}
if (WIFEXITED(ch_stat)) {
INFO(pdlv->ls, "%s: %s (PID %d) %s (%d)", PD_LOG_PREFIX,
"lvm2 cmd", pdlv->cmd_pid, "exited with", WEXITSTATUS(ch_stat));
cmd_state.retcode = WEXITSTATUS(ch_stat);
} else if (WIFSIGNALED(ch_stat)) {
WARN(pdlv->ls, "%s: %s (PID %d) %s (%d)", PD_LOG_PREFIX,
"lvm2 cmd", pdlv->cmd_pid, "got terminated by signal",
WTERMSIG(ch_stat));
cmd_state.signal = WTERMSIG(ch_stat);
}
err = 0;
out:
if (!err)
pdlv_set_cmd_state(pdlv, &cmd_state);
return err;
}
static void debug_print(struct lvmpolld_state *ls, const char * const* ptr)
{
const char * const* tmp = ptr;
if (!tmp)
return;
while (*tmp) {
DEBUGLOG(ls, "%s: %s", PD_LOG_PREFIX, *tmp);
tmp++;
}
}
static void *fork_and_poll(void *args)
{
int outfd, errfd, state;
struct lvmpolld_thread_data *data;
pid_t r;
int error = 1;
struct lvmpolld_lv *pdlv = (struct lvmpolld_lv *) args;
struct lvmpolld_state *ls = pdlv->ls;
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &state);
data = lvmpolld_thread_data_constructor(pdlv);
pthread_setspecific(key, data);
pthread_setcancelstate(state, &state);
if (!data) {
ERROR(ls, "%s: %s", PD_LOG_PREFIX, "Failed to initialize per-thread data");
goto err;
}
DEBUGLOG(ls, "%s: %s", PD_LOG_PREFIX, "cmd line arguments:");
debug_print(ls, pdlv->cmdargv);
DEBUGLOG(ls, "%s: %s", PD_LOG_PREFIX, "---end---");
DEBUGLOG(ls, "%s: %s", PD_LOG_PREFIX, "cmd environment variables:");
debug_print(ls, pdlv->cmdenvp);
DEBUGLOG(ls, "%s: %s", PD_LOG_PREFIX, "---end---");
outfd = data->outpipe[1];
errfd = data->errpipe[1];
r = fork();
if (!r) {
/* child */
/* !!! Do not touch any posix thread primitives !!! */
if ((dup2(outfd, STDOUT_FILENO ) != STDOUT_FILENO) ||
(dup2(errfd, STDERR_FILENO ) != STDERR_FILENO))
_exit(LVMPD_RET_DUP_FAILED);
execve(*(pdlv->cmdargv), (char *const *)pdlv->cmdargv, (char *const *)pdlv->cmdenvp);
_exit(LVMPD_RET_EXC_FAILED);
} else {
/* parent */
if (r == -1) {
ERROR(ls, "%s: %s: (%d) %s", PD_LOG_PREFIX, "fork failed",
errno, _strerror_r(errno, data));
goto err;
}
INFO(ls, "%s: LVM2 cmd \"%s\" (PID: %d)", PD_LOG_PREFIX, *(pdlv->cmdargv), r);
pdlv->cmd_pid = r;
/* failure to close write end of any pipe will result in broken polling */
if (close(data->outpipe[1])) {
ERROR(ls, "%s: %s: (%d) %s", PD_LOG_PREFIX, "failed to close write end of pipe",
errno, _strerror_r(errno, data));
goto err;
}
data->outpipe[1] = -1;
if (close(data->errpipe[1])) {
ERROR(ls, "%s: %s: (%d) %s", PD_LOG_PREFIX, "failed to close write end of err pipe",
errno, _strerror_r(errno, data));
goto err;
}
data->errpipe[1] = -1;
error = poll_for_output(pdlv, data);
DEBUGLOG(ls, "%s: %s", PD_LOG_PREFIX, "polling for lvpoll output has finished");
}
err:
r = 0;
pdst_lock(pdlv->pdst);
if (error) {
/* last reader is responsible for pdlv cleanup */
r = pdlv->cmd_pid;
pdlv_set_error(pdlv, 1);
}
pdlv_set_polling_finished(pdlv, 1);
if (data)
data->pdlv = NULL;
pdst_locked_dec(pdlv->pdst);
pdst_unlock(pdlv->pdst);
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &state);
lvmpolld_thread_data_destroy(data);
pthread_setspecific(key, NULL);
pthread_setcancelstate(state, &state);
update_idle_state(ls);
/*
* This is unfortunate case where we
* know nothing about state of lvm cmd and
* (eventually) ongoing progress.
*
* harvest zombies
*/
if (r)
while(waitpid(r, NULL, 0) < 0 && errno == EINTR);
return NULL;
}
static response progress_info(client_handle h, struct lvmpolld_state *ls, request req)
{
char *id;
struct lvmpolld_lv *pdlv;
struct lvmpolld_store *pdst;
struct lvmpolld_lv_state st;
response r;
const char *lvid = daemon_request_str(req, LVMPD_PARM_LVID, NULL);
const char *sysdir = daemon_request_str(req, LVMPD_PARM_SYSDIR, NULL);
unsigned abort_polling = daemon_request_int(req, LVMPD_PARM_ABORT, 0);
if (!lvid)
return reply(LVMPD_RESP_FAILED, REASON_MISSING_LVID);
id = construct_id(sysdir, lvid);
if (!id) {
ERROR(ls, "%s: %s", PD_LOG_PREFIX, "progress_info request failed to construct ID.");
return reply(LVMPD_RESP_FAILED, REASON_ENOMEM);
}
DEBUGLOG(ls, "%s: %s: %s", PD_LOG_PREFIX, "ID", id);
pdst = abort_polling ? ls->id_to_pdlv_abort : ls->id_to_pdlv_poll;
pdst_lock(pdst);
pdlv = pdst_locked_lookup(pdst, id);
if (pdlv) {
/*
* with store lock held, I'm the only reader accessing the pdlv
*/
st = pdlv_get_status(pdlv);
if (st.error || st.polling_finished) {
INFO(ls, "%s: %s %s", PD_LOG_PREFIX,
"Polling finished. Removing related data structure for LV",
lvid);
pdst_locked_remove(pdst, id);
pdlv_destroy(pdlv);
}
}
/* pdlv must not be dereferenced from now on */
pdst_unlock(pdst);
dm_free(id);
if (pdlv) {
if (st.error)
return reply(LVMPD_RESP_FAILED, REASON_POLLING_FAILED);
if (st.polling_finished)
r = daemon_reply_simple(LVMPD_RESP_FINISHED,
"reason = %s", st.cmd_state.signal ? LVMPD_REAS_SIGNAL : LVMPD_REAS_RETCODE,
LVMPD_PARM_VALUE " = %d", st.cmd_state.signal ?: st.cmd_state.retcode,
NULL);
else
r = daemon_reply_simple(LVMPD_RESP_IN_PROGRESS, NULL);
}
else
r = daemon_reply_simple(LVMPD_RESP_NOT_FOUND, NULL);
return r;
}
static struct lvmpolld_lv *construct_pdlv(request req, struct lvmpolld_state *ls,
struct lvmpolld_store *pdst,
const char *interval, const char *id,
const char *vgname, const char *lvname,
const char *sysdir, enum poll_type type,
unsigned abort_polling, unsigned uinterval)
{
const char **cmdargv, **cmdenvp;
struct lvmpolld_lv *pdlv;
unsigned handle_missing_pvs = daemon_request_int(req, LVMPD_PARM_HANDLE_MISSING_PVS, 0);
pdlv = pdlv_create(ls, id, vgname, lvname, sysdir, type,
interval, uinterval, pdst);
if (!pdlv) {
ERROR(ls, "%s: %s", PD_LOG_PREFIX, "failed to create internal LV data structure.");
return NULL;
}
cmdargv = cmdargv_ctr(pdlv, pdlv->ls->lvm_binary, abort_polling, handle_missing_pvs);
if (!cmdargv) {
pdlv_destroy(pdlv);
ERROR(ls, "%s: %s", PD_LOG_PREFIX, "failed to construct cmd arguments for lvpoll command");
return NULL;
}
cmdenvp = cmdenvp_ctr(pdlv);
if (!cmdenvp) {
pdlv_destroy(pdlv);
ERROR(ls, "%s: %s", PD_LOG_PREFIX, "failed to construct cmd environment for lvpoll command");
return NULL;
}
pdlv->cmdargv = cmdargv;
pdlv->cmdenvp = cmdenvp;
return pdlv;
}
static int spawn_detached_thread(struct lvmpolld_lv *pdlv)
{
int r;
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
r = pthread_create(&pdlv->tid, &attr, fork_and_poll, (void *)pdlv);
pthread_attr_destroy(&attr);
return !r;
}
static response poll_init(client_handle h, struct lvmpolld_state *ls, request req, enum poll_type type)
{
char *id;
struct lvmpolld_lv *pdlv;
struct lvmpolld_store *pdst;
unsigned uinterval;
const char *interval = daemon_request_str(req, LVMPD_PARM_INTERVAL, NULL);
const char *lvid = daemon_request_str(req, LVMPD_PARM_LVID, NULL);
const char *lvname = daemon_request_str(req, LVMPD_PARM_LVNAME, NULL);
const char *vgname = daemon_request_str(req, LVMPD_PARM_VGNAME, NULL);
const char *sysdir = daemon_request_str(req, LVMPD_PARM_SYSDIR, NULL);
unsigned abort_polling = daemon_request_int(req, LVMPD_PARM_ABORT, 0);
assert(type < POLL_TYPE_MAX);
if (abort_polling && type != PVMOVE)
return reply(LVMPD_RESP_EINVAL, REASON_ILLEGAL_ABORT_REQUEST);
if (!interval || strpbrk(interval, "-") || sscanf(interval, "%u", &uinterval) != 1)
return reply(LVMPD_RESP_EINVAL, REASON_INVALID_INTERVAL);
if (!lvname)
return reply(LVMPD_RESP_FAILED, REASON_MISSING_LVNAME);
if (!lvid)
return reply(LVMPD_RESP_FAILED, REASON_MISSING_LVID);
if (!vgname)
return reply(LVMPD_RESP_FAILED, REASON_MISSING_VGNAME);
id = construct_id(sysdir, lvid);
if (!id) {
ERROR(ls, "%s: %s", PD_LOG_PREFIX, "poll_init request failed to construct ID.");
return reply(LVMPD_RESP_FAILED, REASON_ENOMEM);
}
DEBUGLOG(ls, "%s: %s=%s", PD_LOG_PREFIX, "ID", id);
pdst = abort_polling ? ls->id_to_pdlv_abort : ls->id_to_pdlv_poll;
pdst_lock(pdst);
pdlv = pdst_locked_lookup(pdst, id);
if (pdlv && pdlv_get_polling_finished(pdlv)) {
WARN(ls, "%s: %s %s", PD_LOG_PREFIX, "Force removal of uncollected info for LV",
lvid);
/*
* lvmpolld has to remove uncollected results in this case.
* otherwise it would have to refuse request for new polling
* lv with same id.
*/
pdst_locked_remove(pdst, id);
pdlv_destroy(pdlv);
pdlv = NULL;
}
if (pdlv) {
if (!pdlv_is_type(pdlv, type)) {
pdst_unlock(pdst);
ERROR(ls, "%s: %s '%s': expected: %s, requested: %s",
PD_LOG_PREFIX, "poll operation type mismatch on LV identified by",
id,
polling_op(pdlv_get_type(pdlv)), polling_op(type));
dm_free(id);
return reply(LVMPD_RESP_EINVAL,
REASON_DIFFERENT_OPERATION_IN_PROGRESS);
}
pdlv->init_rq_count++; /* safe. protected by store lock */
} else {
pdlv = construct_pdlv(req, ls, pdst, interval, id, vgname,
lvname, sysdir, type, abort_polling, 2 * uinterval);
if (!pdlv) {
pdst_unlock(pdst);
dm_free(id);
return reply(LVMPD_RESP_FAILED, REASON_ENOMEM);
}
if (!pdst_locked_insert(pdst, id, pdlv)) {
pdlv_destroy(pdlv);
pdst_unlock(pdst);
ERROR(ls, "%s: %s", PD_LOG_PREFIX, "couldn't store internal LV data structure");
dm_free(id);
return reply(LVMPD_RESP_FAILED, REASON_ENOMEM);
}
if (!spawn_detached_thread(pdlv)) {
ERROR(ls, "%s: %s", PD_LOG_PREFIX, "failed to spawn detached monitoring thread");
pdst_locked_remove(pdst, id);
pdlv_destroy(pdlv);
pdst_unlock(pdst);
dm_free(id);
return reply(LVMPD_RESP_FAILED, REASON_ENOMEM);
}
pdst_locked_inc(pdst);
if (ls->idle)
ls->idle->is_idle = 0;
}
pdst_unlock(pdst);
dm_free(id);
return daemon_reply_simple(LVMPD_RESP_OK, NULL);
}
static response dump_state(client_handle h, struct lvmpolld_state *ls, request r)
{
response res = { 0 };
struct buffer *b = &res.buffer;
buffer_init(b);
_lvmpolld_global_lock(ls);
buffer_append(b, "# Registered polling operations\n\n");
buffer_append(b, "poll {\n");
pdst_locked_dump(ls->id_to_pdlv_poll, b);
buffer_append(b, "}\n\n");
buffer_append(b, "# Registered abort operations\n\n");
buffer_append(b, "abort {\n");
pdst_locked_dump(ls->id_to_pdlv_abort, b);
buffer_append(b, "}");
_lvmpolld_global_unlock(ls);
return res;
}
static response _handler(struct daemon_state s, client_handle h, request r)
{
struct lvmpolld_state *ls = s.private;
const char *rq = daemon_request_str(r, "request", "NONE");
if (!strcmp(rq, LVMPD_REQ_PVMOVE))
return poll_init(h, ls, r, PVMOVE);
else if (!strcmp(rq, LVMPD_REQ_CONVERT))
return poll_init(h, ls, r, CONVERT);
else if (!strcmp(rq, LVMPD_REQ_MERGE))
return poll_init(h, ls, r, MERGE);
else if (!strcmp(rq, LVMPD_REQ_MERGE_THIN))
return poll_init(h, ls, r, MERGE_THIN);
else if (!strcmp(rq, LVMPD_REQ_PROGRESS))
return progress_info(h, ls, r);
else if (!strcmp(rq, LVMPD_REQ_DUMP))
return dump_state(h, ls, r);
else
return reply(LVMPD_RESP_EINVAL, REASON_REQ_NOT_IMPLEMENTED);
}
static int process_timeout_arg(const char *str, unsigned *max_timeouts)
{
char *endptr;
unsigned long l;
errno = 0;
l = strtoul(str, &endptr, 10);
if (errno || *endptr || l >= UINT_MAX)
return 0;
*max_timeouts = (unsigned) l;
return 1;
}
/* Client functionality */
typedef int (*action_fn_t) (void *args);
struct log_line_baton {
const char *prefix;
};
daemon_handle _lvmpolld = { .error = 0 };
static daemon_handle _lvmpolld_open(const char *socket)
{
daemon_info lvmpolld_info = {
.path = "lvmpolld",
.socket = socket ?: DEFAULT_RUN_DIR "/lvmpolld.socket",
.protocol = LVMPOLLD_PROTOCOL,
.protocol_version = LVMPOLLD_PROTOCOL_VERSION
};
return daemon_open(lvmpolld_info);
}
static void _log_line(const char *line, void *baton) {
struct log_line_baton *b = baton;
fprintf(stdout, "%s%s\n", b->prefix, line);
}
static int printout_raw_response(const char *prefix, const char *msg)
{
struct log_line_baton b = { .prefix = prefix };
char *buf;
char *pos;
buf = dm_strdup(msg);
pos = buf;
if (!buf)
return 0;
while (pos) {
char *next = strchr(pos, '\n');
if (next)
*next = 0;
_log_line(pos, &b);
pos = next ? next + 1 : 0;
}
dm_free(buf);
return 1;
}
/* place all action implementations below */
static int action_dump(void *args __attribute__((unused)))
{
daemon_request req;
daemon_reply repl;
int r = 0;
req = daemon_request_make(LVMPD_REQ_DUMP);
if (!req.cft) {
fprintf(stderr, "Failed to create lvmpolld " LVMPD_REQ_DUMP " request.\n");
goto out_req;
}
repl = daemon_send(_lvmpolld, req);
if (repl.error) {
fprintf(stderr, "Failed to send a request or receive response.\n");
goto out_rep;
}
/*
* This is dumb copy & paste from libdaemon log routines.
*/
if (!printout_raw_response(" ", repl.buffer.mem)) {
fprintf(stderr, "Failed to print out the response.\n");
goto out_rep;
}
r = 1;
out_rep:
daemon_reply_destroy(repl);
out_req:
daemon_request_destroy(req);
return r;
}
enum action_index {
ACTION_DUMP = 0,
ACTION_MAX /* keep at the end */
};
static const action_fn_t actions[ACTION_MAX] = { [ACTION_DUMP] = action_dump };
static int _make_action(enum action_index idx, void *args)
{
return idx < ACTION_MAX ? actions[idx](args) : 0;
}
static int _lvmpolld_client(const char *socket, unsigned action)
{
int r;
_lvmpolld = _lvmpolld_open(socket);
if (_lvmpolld.error || _lvmpolld.socket_fd < 0) {
fprintf(stderr, "Failed to establish connection with lvmpolld.\n");
return 0;
}
r = _make_action(action, NULL);
daemon_close(_lvmpolld);
return r ? EXIT_SUCCESS : EXIT_FAILURE;
}
static int action_idx = ACTION_MAX;
static struct option long_options[] = {
/* Have actions always at the beginning of the array. */
{"dump", no_argument, &action_idx, ACTION_DUMP }, /* or an option_index ? */
/* other options */
{"binary", required_argument, 0, 'B' },
{"foreground", no_argument, 0, 'f' },
{"help", no_argument, 0, 'h' },
{"log", required_argument, 0, 'l' },
{"pidfile", required_argument, 0, 'p' },
{"socket", required_argument, 0, 's' },
{"timeout", required_argument, 0, 't' },
{"version", no_argument, 0, 'V' },
{0, 0, 0, 0 }
};
int main(int argc, char *argv[])
{
int opt;
int option_index = 0;
int client = 0, server = 0;
unsigned action = ACTION_MAX;
struct timeval timeout;
daemon_idle di = { .ptimeout = &timeout };
struct lvmpolld_state ls = { .log_config = "" };
daemon_state s = {
.daemon_fini = _fini,
.daemon_init = _init,
.handler = _handler,
.name = "lvmpolld",
.pidfile = getenv("LVM_LVMPOLLD_PIDFILE") ?: LVMPOLLD_PIDFILE,
.private = &ls,
.protocol = LVMPOLLD_PROTOCOL,
.protocol_version = LVMPOLLD_PROTOCOL_VERSION,
.socket_path = getenv("LVM_LVMPOLLD_SOCKET") ?: LVMPOLLD_SOCKET,
};
while ((opt = getopt_long(argc, argv, "fhVl:p:s:B:t:", long_options, &option_index)) != -1) {
switch (opt) {
case 0 :
if (action < ACTION_MAX) {
fprintf(stderr, "Can't perform more actions. Action already requested: %s\n",
long_options[action].name);
_usage(argv[0], stderr);
exit(EXIT_FAILURE);
}
action = action_idx;
client = 1;
break;
case '?':
_usage(argv[0], stderr);
exit(EXIT_FAILURE);
case 'B': /* --binary */
ls.lvm_binary = optarg;
server = 1;
break;
case 'V': /* --version */
printf("lvmpolld version: " LVM_VERSION "\n");
exit(EXIT_SUCCESS);
case 'f': /* --foreground */
s.foreground = 1;
server = 1;
break;
case 'h': /* --help */
_usage(argv[0], stdout);
exit(EXIT_SUCCESS);
case 'l': /* --log */
ls.log_config = optarg;
server = 1;
break;
case 'p': /* --pidfile */
s.pidfile = optarg;
server = 1;
break;
case 's': /* --socket */
s.socket_path = optarg;
break;
case 't': /* --timeout in seconds */
if (!process_timeout_arg(optarg, &di.max_timeouts)) {
fprintf(stderr, "Invalid value of timeout parameter.\n");
exit(EXIT_FAILURE);
}
/* 0 equals to wait indefinitely */
if (di.max_timeouts)
s.idle = ls.idle = &di;
server = 1;
break;
}
}
if (client && server) {
fprintf(stderr, "Invalid combination of client and server parameters.\n\n");
_usage(argv[0], stdout);
exit(EXIT_FAILURE);
}
if (client)
return _lvmpolld_client(s.socket_path, action);
/* Server */
daemon_start(s);
return EXIT_SUCCESS;
}
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