mirror of
git://sourceware.org/git/lvm2.git
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72b2cb613a
Fix some memory leaks in error paths found by coverity. Use C99 struct initialisers. Move DEFS into configure.h. Clean-ups to remove miscellaneous compiler warnings.
268 lines
6.6 KiB
C
268 lines
6.6 KiB
C
/*
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* Copyright (C) 2003-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004 Red Hat, Inc. All rights reserved.
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*
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* This file is part of LVM2.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License v.2.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "tools.h"
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#include "polldaemon.h"
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#include <signal.h>
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#include <sys/wait.h>
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static void _sigchld_handler(int sig __attribute((unused)))
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{
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while (wait4(-1, NULL, WNOHANG | WUNTRACED, NULL) > 0) ;
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}
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static int _become_daemon(struct cmd_context *cmd)
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{
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pid_t pid;
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struct sigaction act = {
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{_sigchld_handler},
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.sa_flags = SA_NOCLDSTOP,
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};
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log_verbose("Forking background process");
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sigaction(SIGCHLD, &act, NULL);
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if ((pid = fork()) == -1) {
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log_error("fork failed: %s", strerror(errno));
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return 1;
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}
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/* Parent */
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if (pid > 0)
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return 0;
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/* Child */
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if (setsid() == -1)
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log_error("Background process failed to setsid: %s",
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strerror(errno));
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init_verbose(VERBOSE_BASE_LEVEL);
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close(STDIN_FILENO);
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close(STDOUT_FILENO);
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close(STDERR_FILENO);
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strncpy(*cmd->argv, "(lvm2copyd)", strlen(*cmd->argv));
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reset_locking();
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dev_close_all();
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return 1;
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}
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static int _check_mirror_status(struct cmd_context *cmd,
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struct volume_group *vg,
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struct logical_volume *lv_mirr,
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const char *name, struct daemon_parms *parms,
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int *finished)
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{
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struct list *lvs_changed;
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float segment_percent = 0.0, overall_percent = 0.0;
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uint32_t event_nr = 0;
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/* By default, caller should not retry */
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*finished = 1;
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if (parms->aborting) {
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if (!(lvs_changed = lvs_using_lv(cmd, vg, lv_mirr))) {
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log_error("Failed to generate list of copied LVs: "
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"can't abort.");
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return 0;
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}
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parms->poll_fns->finish_copy(cmd, vg, lv_mirr, lvs_changed);
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return 0;
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}
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if (!lv_mirror_percent(cmd, lv_mirr, !parms->interval, &segment_percent,
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&event_nr)) {
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log_error("ABORTING: Mirror percentage check failed.");
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return 0;
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}
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overall_percent = copy_percent(lv_mirr);
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if (parms->progress_display)
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log_print("%s: Moved: %.1f%%", name, overall_percent);
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else
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log_verbose("%s: Moved: %.1f%%", name, overall_percent);
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if (segment_percent < 100.0) {
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/* The only case the caller *should* try again later */
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*finished = 0;
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return 1;
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}
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if (!(lvs_changed = lvs_using_lv(cmd, vg, lv_mirr))) {
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log_error("ABORTING: Failed to generate list of copied LVs");
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return 0;
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}
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/* Finished? Or progress to next segment? */
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if (overall_percent >= 100.0) {
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if (!parms->poll_fns->finish_copy(cmd, vg, lv_mirr,
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lvs_changed))
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return 0;
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} else {
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if (!parms->poll_fns->update_metadata(cmd, vg, lv_mirr,
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lvs_changed, 0)) {
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log_error("ABORTING: Segment progression failed.");
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parms->poll_fns->finish_copy(cmd, vg, lv_mirr,
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lvs_changed);
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return 0;
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}
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*finished = 0; /* Another segment */
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}
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return 1;
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}
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static int _wait_for_single_mirror(struct cmd_context *cmd, const char *name,
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struct daemon_parms *parms)
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{
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struct volume_group *vg;
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struct logical_volume *lv_mirr;
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int finished = 0;
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/* Poll for mirror completion */
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while (!finished) {
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/* FIXME Also needed in vg/lvchange -ay? */
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/* FIXME Use alarm for regular intervals instead */
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if (parms->interval && !parms->aborting) {
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sleep(parms->interval);
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/* Devices might have changed while we slept */
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init_full_scan_done(0);
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}
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/* Locks the (possibly renamed) VG again */
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if (!(vg = parms->poll_fns->get_copy_vg(cmd, name))) {
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log_error("ABORTING: Can't reread VG for %s", name);
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/* What more could we do here? */
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return 0;
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}
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if (!(lv_mirr = parms->poll_fns->get_copy_lv(cmd, vg, name,
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parms->lv_type))) {
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log_error("ABORTING: Can't find mirror LV in %s for %s",
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vg->name, name);
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unlock_vg(cmd, vg->name);
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return 0;
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}
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if (!_check_mirror_status(cmd, vg, lv_mirr, name, parms,
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&finished)) {
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unlock_vg(cmd, vg->name);
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return 0;
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}
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unlock_vg(cmd, vg->name);
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}
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return 1;
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}
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static int _poll_vg(struct cmd_context *cmd, const char *vgname,
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struct volume_group *vg, int consistent, void *handle)
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{
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struct daemon_parms *parms = (struct daemon_parms *) handle;
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struct lv_list *lvl;
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struct logical_volume *lv_mirr;
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const char *name;
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int finished;
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if (!vg) {
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log_error("Couldn't read volume group %s", vgname);
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return ECMD_FAILED;
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}
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if (!consistent) {
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log_error("Volume Group %s inconsistent - skipping", vgname);
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/* FIXME Should we silently recover it here or not? */
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return ECMD_FAILED;
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}
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if (vg->status & EXPORTED_VG) {
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log_error("Volume group \"%s\" is exported", vg->name);
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return ECMD_FAILED;
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}
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list_iterate_items(lvl, &vg->lvs) {
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lv_mirr = lvl->lv;
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if (!(lv_mirr->status & parms->lv_type))
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continue;
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if (!(name = parms->poll_fns->get_copy_name_from_lv(lv_mirr)))
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continue;
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/* FIXME Need to do the activation from _set_up_pvmove here
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* if it's not running and we're not aborting */
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if (_check_mirror_status(cmd, vg, lv_mirr, name,
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parms, &finished) && !finished)
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parms->outstanding_count++;
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}
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return ECMD_PROCESSED;
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}
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static void _poll_for_all_vgs(struct cmd_context *cmd,
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struct daemon_parms *parms)
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{
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while (1) {
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parms->outstanding_count = 0;
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process_each_vg(cmd, 0, NULL, LCK_VG_WRITE, 1, parms, _poll_vg);
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if (!parms->outstanding_count)
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break;
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sleep(parms->interval);
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}
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}
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int poll_daemon(struct cmd_context *cmd, const char *name, unsigned background,
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uint32_t lv_type, struct poll_functions *poll_fns)
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{
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struct daemon_parms parms;
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parms.aborting = arg_count(cmd, abort_ARG) ? 1 : 0;
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parms.background = background;
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parms.interval = arg_uint_value(cmd, interval_ARG, DEFAULT_INTERVAL);
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parms.progress_display = 1;
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parms.lv_type = lv_type;
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parms.poll_fns = poll_fns;
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if (parms.interval && !parms.aborting)
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log_verbose("Checking progress every %u seconds",
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parms.interval);
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if (!parms.interval) {
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parms.progress_display = 0;
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/* FIXME Disabled multiple-copy wait_event */
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if (!name)
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parms.interval = DEFAULT_INTERVAL;
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}
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if (parms.background) {
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if (!_become_daemon(cmd))
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return ECMD_PROCESSED; /* Parent */
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parms.progress_display = 0;
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/* FIXME Use wait_event (i.e. interval = 0) and */
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/* fork one daemon per copy? */
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}
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if (name) {
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if (!_wait_for_single_mirror(cmd, name, &parms))
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return ECMD_FAILED;
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} else
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_poll_for_all_vgs(cmd, &parms);
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return ECMD_PROCESSED;
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}
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